diff options
Diffstat (limited to 'plugins/Dbx_mdb/src/mdbx/mdbx.c')
| -rw-r--r-- | plugins/Dbx_mdb/src/mdbx/mdbx.c | 11613 |
1 files changed, 0 insertions, 11613 deletions
diff --git a/plugins/Dbx_mdb/src/mdbx/mdbx.c b/plugins/Dbx_mdb/src/mdbx/mdbx.c deleted file mode 100644 index d55484b802..0000000000 --- a/plugins/Dbx_mdb/src/mdbx/mdbx.c +++ /dev/null @@ -1,11613 +0,0 @@ -/* - * Copyright 2015-2017 Leonid Yuriev <leo@yuriev.ru> - * and other libmdbx authors: please see AUTHORS file. - * All rights reserved. - * - * This code is derived from "LMDB engine" written by - * Howard Chu (Symas Corporation), which itself derived from btree.c - * written by Martin Hedenfalk. - * - * --- - * - * Portions Copyright 2011-2015 Howard Chu, Symas Corp. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted only as authorized by the OpenLDAP - * Public License. - * - * A copy of this license is available in the file LICENSE in the - * top-level directory of the distribution or, alternatively, at - * <http://www.OpenLDAP.org/license.html>. - * - * --- - * - * Portions Copyright (c) 2009, 2010 Martin Hedenfalk <martin@bzero.se> - * - * Permission to use, copy, modify, and distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES - * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR - * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN - * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF - * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ - -#include "./bits.h" - -/*----------------------------------------------------------------------------*/ -/* rthc (tls keys and destructors) */ - -typedef struct rthc_entry_t { - MDBX_reader *begin; - MDBX_reader *end; - mdbx_thread_key_t key; -} rthc_entry_t; - -#if MDBX_DEBUG -#define RTHC_INITIAL_LIMIT 1 -#else -#define RTHC_INITIAL_LIMIT 16 -#endif - -static unsigned rthc_count; -static unsigned rthc_limit = RTHC_INITIAL_LIMIT; -static rthc_entry_t rthc_table_static[RTHC_INITIAL_LIMIT]; -static rthc_entry_t *rthc_table = rthc_table_static; - -__cold void mdbx_rthc_dtor(void *ptr) { - MDBX_reader *rthc = (MDBX_reader *)ptr; - - mdbx_rthc_lock(); - const mdbx_pid_t self_pid = mdbx_getpid(); - for (unsigned i = 0; i < rthc_count; ++i) { - if (rthc >= rthc_table[i].begin && rthc < rthc_table[i].end) { - if (rthc->mr_pid == self_pid) { - rthc->mr_pid = 0; - mdbx_coherent_barrier(); - } - break; - } - } - mdbx_rthc_unlock(); -} - -__cold void mdbx_rthc_cleanup(void) { - mdbx_rthc_lock(); - const mdbx_pid_t self_pid = mdbx_getpid(); - for (unsigned i = 0; i < rthc_count; ++i) { - mdbx_thread_key_t key = rthc_table[i].key; - MDBX_reader *rthc = mdbx_thread_rthc_get(key); - if (rthc) { - mdbx_thread_rthc_set(key, NULL); - if (rthc->mr_pid == self_pid) { - rthc->mr_pid = 0; - mdbx_coherent_barrier(); - } - } - } - mdbx_rthc_unlock(); -} - -__cold int mdbx_rthc_alloc(mdbx_thread_key_t *key, MDBX_reader *begin, - MDBX_reader *end) { -#ifndef NDEBUG - *key = (mdbx_thread_key_t)0xBADBADBAD; -#endif /* NDEBUG */ - int rc = mdbx_thread_key_create(key); - if (rc != MDBX_SUCCESS) - return rc; - - mdbx_rthc_lock(); - if (rthc_count == rthc_limit) { - rthc_entry_t *new_table = - realloc((rthc_table == rthc_table_static) ? NULL : rthc_table, - sizeof(rthc_entry_t) * rthc_limit * 2); - if (new_table == NULL) { - rc = MDBX_ENOMEM; - goto bailout; - } - if (rthc_table == rthc_table_static) - memcpy(new_table, rthc_table_static, sizeof(rthc_table_static)); - rthc_table = new_table; - rthc_limit *= 2; - } - - rthc_table[rthc_count].key = *key; - rthc_table[rthc_count].begin = begin; - rthc_table[rthc_count].end = end; - ++rthc_count; - mdbx_rthc_unlock(); - return MDBX_SUCCESS; - -bailout: - mdbx_thread_key_delete(*key); - mdbx_rthc_unlock(); - return rc; -} - -__cold void mdbx_rthc_remove(mdbx_thread_key_t key) { - mdbx_rthc_lock(); - mdbx_thread_key_delete(key); - - for (unsigned i = 0; i < rthc_count; ++i) { - if (key == rthc_table[i].key) { - const mdbx_pid_t self_pid = mdbx_getpid(); - for (MDBX_reader *rthc = rthc_table[i].begin; rthc < rthc_table[i].end; - ++rthc) - if (rthc->mr_pid == self_pid) - rthc->mr_pid = 0; - mdbx_coherent_barrier(); - if (--rthc_count > 0) - rthc_table[i] = rthc_table[rthc_count]; - else if (rthc_table != rthc_table_static) { - free(rthc_table); - rthc_table = rthc_table_static; - rthc_limit = RTHC_INITIAL_LIMIT; - } - break; - } - } - - mdbx_rthc_unlock(); -} - -/*----------------------------------------------------------------------------*/ - -/* Allocate an PNL. - * Allocates memory for an PNL of the given size. - * Returns PNL on success, NULL on failure. */ -static MDBX_PNL mdbx_pnl_alloc(size_t size) { - MDBX_PNL pl = malloc((size + 2) * sizeof(pgno_t)); - if (likely(pl)) { - *pl++ = (pgno_t)size; - *pl = 0; - } - return pl; -} - -static MDBX_TXL mdbx_txl_alloc(void) { - const size_t malloc_overhead = sizeof(void *) * 2; - const size_t bytes = mdbx_roundup2(malloc_overhead + sizeof(txnid_t) * 61, - MDBX_CACHELINE_SIZE) - - malloc_overhead; - MDBX_TXL ptr = malloc(bytes); - if (likely(ptr)) { - *ptr++ = bytes / sizeof(txnid_t) - 2; - *ptr = 0; - } - return ptr; -} - -/* Free an PNL. - * [in] pl The PNL to free. */ -static void mdbx_pnl_free(MDBX_PNL pl) { - if (likely(pl)) - free(pl - 1); -} - -static void mdbx_txl_free(MDBX_TXL list) { - if (likely(list)) - free(list - 1); -} - -/* Append ID to PNL. The PNL must be big enough. */ -static __inline void mdbx_pnl_xappend(MDBX_PNL pl, pgno_t id) { - assert(pl[0] + (size_t)1 < MDBX_PNL_ALLOCLEN(pl)); - pl[pl[0] += 1] = id; -} - -static bool mdbx_pnl_check(MDBX_PNL pl) { - if (pl) { - for (const pgno_t *ptr = pl + pl[0]; --ptr > pl;) { - assert(MDBX_PNL_ORDERED(ptr[0], ptr[1])); - assert(ptr[0] >= NUM_METAS); - if (unlikely(MDBX_PNL_DISORDERED(ptr[0], ptr[1]) || ptr[0] < NUM_METAS)) - return false; - } - } - return true; -} - -/* Sort an PNL. - * [in,out] pnl The PNL to sort. */ -static void __hot mdbx_pnl_sort(MDBX_PNL pnl) { - /* Max possible depth of int-indexed tree * 2 items/level */ - int istack[sizeof(int) * CHAR_BIT * 2]; - int i, j, k, l, ir, jstack; - pgno_t a; - -/* Quicksort + Insertion sort for small arrays */ -#define PNL_SMALL 8 -#define PNL_SWAP(a, b) \ - do { \ - pgno_t tmp_pgno = (a); \ - (a) = (b); \ - (b) = tmp_pgno; \ - } while (0) - - ir = (int)pnl[0]; - l = 1; - jstack = 0; - while (1) { - if (ir - l < PNL_SMALL) { /* Insertion sort */ - for (j = l + 1; j <= ir; j++) { - a = pnl[j]; - for (i = j - 1; i >= 1; i--) { - if (MDBX_PNL_DISORDERED(a, pnl[i])) - break; - pnl[i + 1] = pnl[i]; - } - pnl[i + 1] = a; - } - if (jstack == 0) - break; - ir = istack[jstack--]; - l = istack[jstack--]; - } else { - k = (l + ir) >> 1; /* Choose median of left, center, right */ - PNL_SWAP(pnl[k], pnl[l + 1]); - if (MDBX_PNL_ORDERED(pnl[ir], pnl[l])) - PNL_SWAP(pnl[l], pnl[ir]); - - if (MDBX_PNL_ORDERED(pnl[ir], pnl[l + 1])) - PNL_SWAP(pnl[l + 1], pnl[ir]); - - if (MDBX_PNL_ORDERED(pnl[l + 1], pnl[l])) - PNL_SWAP(pnl[l], pnl[l + 1]); - - i = l + 1; - j = ir; - a = pnl[l + 1]; - while (1) { - do - i++; - while (MDBX_PNL_ORDERED(pnl[i], a)); - do - j--; - while (MDBX_PNL_ORDERED(a, pnl[j])); - if (j < i) - break; - PNL_SWAP(pnl[i], pnl[j]); - } - pnl[l + 1] = pnl[j]; - pnl[j] = a; - jstack += 2; - if (ir - i + 1 >= j - l) { - istack[jstack] = ir; - istack[jstack - 1] = i; - ir = j - 1; - } else { - istack[jstack] = j - 1; - istack[jstack - 1] = l; - l = i; - } - } - } -#undef PNL_SMALL -#undef PNL_SWAP - assert(mdbx_pnl_check(pnl)); -} - -/* Search for an ID in an PNL. - * [in] pl The PNL to search. - * [in] id The ID to search for. - * Returns The index of the first ID greater than or equal to id. */ -static unsigned __hot mdbx_pnl_search(MDBX_PNL pnl, pgno_t id) { - assert(mdbx_pnl_check(pnl)); - - /* binary search of id in pl - * if found, returns position of id - * if not found, returns first position greater than id */ - unsigned base = 0; - unsigned cursor = 1; - int val = 0; - unsigned n = pnl[0]; - - while (n > 0) { - unsigned pivot = n >> 1; - cursor = base + pivot + 1; - val = MDBX_PNL_ASCENDING ? mdbx_cmp2int(pnl[cursor], id) - : mdbx_cmp2int(id, pnl[cursor]); - - if (val < 0) { - n = pivot; - } else if (val > 0) { - base = cursor; - n -= pivot + 1; - } else { - return cursor; - } - } - - if (val > 0) - ++cursor; - - return cursor; -} - -/* Shrink an PNL. - * Return the PNL to the default size if it has grown larger. - * [in,out] ppl Address of the PNL to shrink. */ -static void mdbx_pnl_shrink(MDBX_PNL *ppl) { - MDBX_PNL pl = *ppl - 1; - if (unlikely(*pl > MDBX_PNL_UM_MAX)) { - /* shrink to MDBX_PNL_UM_MAX */ - pl = realloc(pl, (MDBX_PNL_UM_MAX + 2) * sizeof(pgno_t)); - if (likely(pl)) { - *pl++ = MDBX_PNL_UM_MAX; - *ppl = pl; - } - } -} - -/* Grow an PNL. - * Return the PNL to the size growed by given number. - * [in,out] ppl Address of the PNL to grow. */ -static int mdbx_pnl_grow(MDBX_PNL *ppl, size_t num) { - MDBX_PNL idn = *ppl - 1; - /* grow it */ - idn = realloc(idn, (*idn + num + 2) * sizeof(pgno_t)); - if (unlikely(!idn)) - return MDBX_ENOMEM; - *idn++ += (pgno_t)num; - *ppl = idn; - return 0; -} - -static int mdbx_txl_grow(MDBX_TXL *ptr, size_t num) { - MDBX_TXL list = *ptr - 1; - /* grow it */ - list = realloc(list, ((size_t)*list + num + 2) * sizeof(txnid_t)); - if (unlikely(!list)) - return MDBX_ENOMEM; - *list++ += num; - *ptr = list; - return 0; -} - -/* Make room for num additional elements in an PNL. - * [in,out] ppl Address of the PNL. - * [in] num Number of elements to make room for. - * Returns 0 on success, MDBX_ENOMEM on failure. */ -static int mdbx_pnl_need(MDBX_PNL *ppl, size_t num) { - MDBX_PNL pl = *ppl; - num += pl[0]; - if (unlikely(num > pl[-1])) { - num = (num + num / 4 + (256 + 2)) & -256; - pl = realloc(pl - 1, num * sizeof(pgno_t)); - if (unlikely(!pl)) - return MDBX_ENOMEM; - *pl++ = (pgno_t)num - 2; - *ppl = pl; - } - return 0; -} - -/* Append an ID onto an PNL. - * [in,out] ppl Address of the PNL to append to. - * [in] id The ID to append. - * Returns 0 on success, MDBX_ENOMEM if the PNL is too large. */ -static int mdbx_pnl_append(MDBX_PNL *ppl, pgno_t id) { - MDBX_PNL pl = *ppl; - /* Too big? */ - if (unlikely(pl[0] >= pl[-1])) { - if (mdbx_pnl_grow(ppl, MDBX_PNL_UM_MAX)) - return MDBX_ENOMEM; - pl = *ppl; - } - pl[0]++; - pl[pl[0]] = id; - return 0; -} - -static int mdbx_txl_append(MDBX_TXL *ptr, txnid_t id) { - MDBX_TXL list = *ptr; - /* Too big? */ - if (unlikely(list[0] >= list[-1])) { - if (mdbx_txl_grow(ptr, (size_t)list[0])) - return MDBX_ENOMEM; - list = *ptr; - } - list[0]++; - list[list[0]] = id; - return 0; -} - -/* Append an PNL onto an PNL. - * [in,out] ppl Address of the PNL to append to. - * [in] app The PNL to append. - * Returns 0 on success, MDBX_ENOMEM if the PNL is too large. */ -static int mdbx_pnl_append_list(MDBX_PNL *ppl, MDBX_PNL app) { - MDBX_PNL pnl = *ppl; - /* Too big? */ - if (unlikely(pnl[0] + app[0] >= pnl[-1])) { - if (mdbx_pnl_grow(ppl, app[0])) - return MDBX_ENOMEM; - pnl = *ppl; - } - memcpy(&pnl[pnl[0] + 1], &app[1], app[0] * sizeof(pgno_t)); - pnl[0] += app[0]; - return 0; -} - -static int mdbx_txl_append_list(MDBX_TXL *ptr, MDBX_TXL append) { - MDBX_TXL list = *ptr; - /* Too big? */ - if (unlikely(list[0] + append[0] >= list[-1])) { - if (mdbx_txl_grow(ptr, (size_t)append[0])) - return MDBX_ENOMEM; - list = *ptr; - } - memcpy(&list[list[0] + 1], &append[1], (size_t)append[0] * sizeof(txnid_t)); - list[0] += append[0]; - return 0; -} - -/* Append an ID range onto an PNL. - * [in,out] ppl Address of the PNL to append to. - * [in] id The lowest ID to append. - * [in] n Number of IDs to append. - * Returns 0 on success, MDBX_ENOMEM if the PNL is too large. */ -static int mdbx_pnl_append_range(MDBX_PNL *ppl, pgno_t id, size_t n) { - pgno_t *pnl = *ppl, len = pnl[0]; - /* Too big? */ - if (unlikely(len + n > pnl[-1])) { - if (mdbx_pnl_grow(ppl, n | MDBX_PNL_UM_MAX)) - return MDBX_ENOMEM; - pnl = *ppl; - } - pnl[0] = len + (pgno_t)n; - pnl += len; - while (n) - pnl[n--] = id++; - return 0; -} - -/* Merge an PNL onto an PNL. The destination PNL must be big enough. - * [in] pl The PNL to merge into. - * [in] merge The PNL to merge. */ -static void __hot mdbx_pnl_xmerge(MDBX_PNL pnl, MDBX_PNL merge) { - assert(mdbx_pnl_check(pnl)); - assert(mdbx_pnl_check(merge)); - pgno_t old_id, merge_id, i = merge[0], j = pnl[0], k = i + j, total = k; - pnl[0] = - MDBX_PNL_ASCENDING ? 0 : ~(pgno_t)0; /* delimiter for pl scan below */ - old_id = pnl[j]; - while (i) { - merge_id = merge[i--]; - for (; MDBX_PNL_ORDERED(merge_id, old_id); old_id = pnl[--j]) - pnl[k--] = old_id; - pnl[k--] = merge_id; - } - pnl[0] = total; - assert(mdbx_pnl_check(pnl)); -} - -/* Search for an ID in an ID2L. - * [in] pnl The ID2L to search. - * [in] id The ID to search for. - * Returns The index of the first ID2 whose mid member is greater than - * or equal to id. */ -static unsigned __hot mdbx_mid2l_search(MDBX_ID2L pnl, pgno_t id) { - /* binary search of id in pnl - * if found, returns position of id - * if not found, returns first position greater than id */ - unsigned base = 0; - unsigned cursor = 1; - int val = 0; - unsigned n = (unsigned)pnl[0].mid; - -#if MDBX_DEBUG - for (const MDBX_ID2 *ptr = pnl + pnl[0].mid; --ptr > pnl;) { - assert(ptr[0].mid < ptr[1].mid); - assert(ptr[0].mid >= NUM_METAS); - } -#endif - - while (n > 0) { - unsigned pivot = n >> 1; - cursor = base + pivot + 1; - val = mdbx_cmp2int(id, pnl[cursor].mid); - - if (val < 0) { - n = pivot; - } else if (val > 0) { - base = cursor; - n -= pivot + 1; - } else { - return cursor; - } - } - - if (val > 0) - ++cursor; - - return cursor; -} - -/* Insert an ID2 into a ID2L. - * [in,out] pnl The ID2L to insert into. - * [in] id The ID2 to insert. - * Returns 0 on success, -1 if the ID was already present in the ID2L. */ -static int mdbx_mid2l_insert(MDBX_ID2L pnl, MDBX_ID2 *id) { - unsigned x = mdbx_mid2l_search(pnl, id->mid); - if (unlikely(x < 1)) - return /* internal error */ -2; - - if (x <= pnl[0].mid && pnl[x].mid == id->mid) - return /* duplicate */ -1; - - if (unlikely(pnl[0].mid >= MDBX_PNL_UM_MAX)) - return /* too big */ -2; - - /* insert id */ - pnl[0].mid++; - for (unsigned i = (unsigned)pnl[0].mid; i > x; i--) - pnl[i] = pnl[i - 1]; - pnl[x] = *id; - return 0; -} - -/* Append an ID2 into a ID2L. - * [in,out] pnl The ID2L to append into. - * [in] id The ID2 to append. - * Returns 0 on success, -2 if the ID2L is too big. */ -static int mdbx_mid2l_append(MDBX_ID2L pnl, MDBX_ID2 *id) { -#if MDBX_DEBUG - for (unsigned i = pnl[0].mid; i > 0; --i) { - assert(pnl[i].mid != id->mid); - if (unlikely(pnl[i].mid == id->mid)) - return -1; - } -#endif - - /* Too big? */ - if (unlikely(pnl[0].mid >= MDBX_PNL_UM_MAX)) - return -2; - - pnl[0].mid++; - pnl[pnl[0].mid] = *id; - return 0; -} - -/*----------------------------------------------------------------------------*/ - -int mdbx_runtime_flags = MDBX_DBG_PRINT -#if MDBX_DEBUG - | MDBX_DBG_ASSERT -#endif -#if MDBX_DEBUG > 1 - | MDBX_DBG_TRACE -#endif -#if MDBX_DEBUG > 2 - | MDBX_DBG_AUDIT -#endif -#if MDBX_DEBUG > 3 - | MDBX_DBG_EXTRA -#endif - ; - -MDBX_debug_func *mdbx_debug_logger; - -static int mdbx_page_alloc(MDBX_cursor *mc, unsigned num, MDBX_page **mp, - int flags); -static int mdbx_page_new(MDBX_cursor *mc, uint32_t flags, unsigned num, - MDBX_page **mp); -static int mdbx_page_touch(MDBX_cursor *mc); -static int mdbx_cursor_touch(MDBX_cursor *mc); - -#define MDBX_END_NAMES \ - { \ - "committed", "empty-commit", "abort", "reset", "reset-tmp", "fail-begin", \ - "fail-beginchild" \ - } -enum { - /* mdbx_txn_end operation number, for logging */ - MDBX_END_COMMITTED, - MDBX_END_EMPTY_COMMIT, - MDBX_END_ABORT, - MDBX_END_RESET, - MDBX_END_RESET_TMP, - MDBX_END_FAIL_BEGIN, - MDBX_END_FAIL_BEGINCHILD -}; -#define MDBX_END_OPMASK 0x0F /* mask for mdbx_txn_end() operation number */ -#define MDBX_END_UPDATE 0x10 /* update env state (DBIs) */ -#define MDBX_END_FREE 0x20 /* free txn unless it is MDBX_env.me_txn0 */ -#define MDBX_END_EOTDONE 0x40 /* txn's cursors already closed */ -#define MDBX_END_SLOT 0x80 /* release any reader slot if MDBX_NOTLS */ -static int mdbx_txn_end(MDBX_txn *txn, unsigned mode); - -static int mdbx_page_get(MDBX_cursor *mc, pgno_t pgno, MDBX_page **mp, - int *lvl); -static int mdbx_page_search_root(MDBX_cursor *mc, MDBX_val *key, int modify); - -#define MDBX_PS_MODIFY 1 -#define MDBX_PS_ROOTONLY 2 -#define MDBX_PS_FIRST 4 -#define MDBX_PS_LAST 8 -static int mdbx_page_search(MDBX_cursor *mc, MDBX_val *key, int flags); -static int mdbx_page_merge(MDBX_cursor *csrc, MDBX_cursor *cdst); - -#define MDBX_SPLIT_REPLACE MDBX_APPENDDUP /* newkey is not new */ -static int mdbx_page_split(MDBX_cursor *mc, MDBX_val *newkey, MDBX_val *newdata, - pgno_t newpgno, unsigned nflags); - -static int mdbx_read_header(MDBX_env *env, MDBX_meta *meta); -static int mdbx_sync_locked(MDBX_env *env, unsigned flags, - MDBX_meta *const pending); -static void mdbx_env_close0(MDBX_env *env); - -static MDBX_node *mdbx_node_search(MDBX_cursor *mc, MDBX_val *key, int *exactp); -static int mdbx_node_add(MDBX_cursor *mc, unsigned indx, MDBX_val *key, - MDBX_val *data, pgno_t pgno, unsigned flags); -static void mdbx_node_del(MDBX_cursor *mc, size_t ksize); -static void mdbx_node_shrink(MDBX_page *mp, unsigned indx); -static int mdbx_node_move(MDBX_cursor *csrc, MDBX_cursor *cdst, int fromleft); -static int mdbx_node_read(MDBX_cursor *mc, MDBX_node *leaf, MDBX_val *data); -static size_t mdbx_leaf_size(MDBX_env *env, MDBX_val *key, MDBX_val *data); -static size_t mdbx_branch_size(MDBX_env *env, MDBX_val *key); - -static int mdbx_rebalance(MDBX_cursor *mc); -static int mdbx_update_key(MDBX_cursor *mc, MDBX_val *key); - -static void mdbx_cursor_pop(MDBX_cursor *mc); -static int mdbx_cursor_push(MDBX_cursor *mc, MDBX_page *mp); - -static int mdbx_cursor_del0(MDBX_cursor *mc); -static int mdbx_del0(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key, MDBX_val *data, - unsigned flags); -static int mdbx_cursor_sibling(MDBX_cursor *mc, int move_right); -static int mdbx_cursor_next(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data, - MDBX_cursor_op op); -static int mdbx_cursor_prev(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data, - MDBX_cursor_op op); -static int mdbx_cursor_set(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data, - MDBX_cursor_op op, int *exactp); -static int mdbx_cursor_first(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data); -static int mdbx_cursor_last(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data); - -static void mdbx_cursor_init(MDBX_cursor *mc, MDBX_txn *txn, MDBX_dbi dbi, - MDBX_xcursor *mx); -static void mdbx_xcursor_init0(MDBX_cursor *mc); -static void mdbx_xcursor_init1(MDBX_cursor *mc, MDBX_node *node); -static void mdbx_xcursor_init2(MDBX_cursor *mc, MDBX_xcursor *src_mx, - int force); - -static int mdbx_drop0(MDBX_cursor *mc, int subs); - -static MDBX_cmp_func mdbx_cmp_memn, mdbx_cmp_memnr, mdbx_cmp_int_ai, - mdbx_cmp_int_a2, mdbx_cmp_int_ua; - -static const char *__mdbx_strerr(int errnum) { - /* Table of descriptions for MDBX errors */ - static const char *const tbl[] = { - "MDBX_KEYEXIST: Key/data pair already exists", - "MDBX_NOTFOUND: No matching key/data pair found", - "MDBX_PAGE_NOTFOUND: Requested page not found", - "MDBX_CORRUPTED: Database is corrupted", - "MDBX_PANIC: Update of meta page failed or environment had fatal error", - "MDBX_VERSION_MISMATCH: DB version mismatch libmdbx", - "MDBX_INVALID: File is not an MDBX file", - "MDBX_MAP_FULL: Environment mapsize limit reached", - "MDBX_DBS_FULL: Too may DBI (maxdbs reached)", - "MDBX_READERS_FULL: Too many readers (maxreaders reached)", - NULL /* MDBX_TLS_FULL (-30789): unused in MDBX */, - "MDBX_TXN_FULL: Transaction has too many dirty pages - transaction too " - "big", - "MDBX_CURSOR_FULL: Internal error - cursor stack limit reached", - "MDBX_PAGE_FULL: Internal error - page has no more space", - "MDBX_MAP_RESIZED: Database contents grew beyond environment mapsize", - "MDBX_INCOMPATIBLE: Operation and DB incompatible, or DB flags changed", - "MDBX_BAD_RSLOT: Invalid reuse of reader locktable slot", - "MDBX_BAD_TXN: Transaction must abort, has a child, or is invalid", - "MDBX_BAD_VALSIZE: Unsupported size of key/DB name/data, or wrong " - "DUPFIXED size", - "MDBX_BAD_DBI: The specified DBI handle was closed/changed unexpectedly", - "MDBX_PROBLEM: Unexpected problem - txn should abort", - "MDBX_BUSY: Another write transation is started", - }; - - if (errnum >= MDBX_KEYEXIST && errnum <= MDBX_LAST_ERRCODE) { - int i = errnum - MDBX_KEYEXIST; - return tbl[i]; - } - - switch (errnum) { - case MDBX_SUCCESS: - return "MDBX_SUCCESS: Successful"; - case MDBX_EMULTIVAL: - return "MDBX_EMULTIVAL: Unable to update multi-value for the given key"; - case MDBX_EBADSIGN: - return "MDBX_EBADSIGN: Wrong signature of a runtime object(s)"; - case MDBX_WANNA_RECOVERY: - return "MDBX_WANNA_RECOVERY: Database should be recovered, but this could " - "NOT be done in a read-only mode"; - case MDBX_EKEYMISMATCH: - return "MDBX_EKEYMISMATCH: The given key value is mismatched to the " - "current cursor position"; - case MDBX_TOO_LARGE: - return "MDBX_TOO_LARGE: Database is too large for current system, " - "e.g. could NOT be mapped into RAM"; - case MDBX_THREAD_MISMATCH: - return "MDBX_THREAD_MISMATCH: A thread has attempted to use a not " - "owned object, e.g. a transaction that started by another thread"; - default: - return NULL; - } -} - -const char *__cold mdbx_strerror_r(int errnum, char *buf, size_t buflen) { - const char *msg = __mdbx_strerr(errnum); - if (!msg) { - if (!buflen || buflen > INT_MAX) - return NULL; -#ifdef _MSC_VER - size_t size = FormatMessageA( - FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, - errnum, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buf, (DWORD)buflen, - NULL); - return size ? buf : NULL; -#elif defined(_GNU_SOURCE) - /* GNU-specific */ - msg = strerror_r(errnum, buf, buflen); -#elif (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) - /* XSI-compliant */ - int rc = strerror_r(errnum, buf, buflen); - if (rc) { - rc = snprintf(buf, buflen, "error %d", errnum); - assert(rc > 0); - } - return buf; -#else - strncpy(buf, strerror(errnum), buflen); - buf[buflen - 1] = '\0'; - return buf; -#endif - } - return msg; -} - -const char *__cold mdbx_strerror(int errnum) { - const char *msg = __mdbx_strerr(errnum); - if (!msg) { -#ifdef _MSC_VER - static __thread char buffer[1024]; - size_t size = FormatMessageA( - FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, - errnum, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buffer, - sizeof(buffer), NULL); - if (size) - msg = buffer; -#else - msg = strerror(errnum); -#endif - } - return msg; -} - -static txnid_t mdbx_oomkick(MDBX_env *env, const txnid_t laggard); - -void __cold mdbx_debug_log(int type, const char *function, int line, - const char *fmt, ...) { - va_list args; - - va_start(args, fmt); - if (mdbx_debug_logger) - mdbx_debug_logger(type, function, line, fmt, args); - else { - if (function && line > 0) - fprintf(stderr, "%s:%d ", function, line); - else if (function) - fprintf(stderr, "%s: ", function); - else if (line > 0) - fprintf(stderr, "%d: ", line); - vfprintf(stderr, fmt, args); - } - va_end(args); -} - -/* Dump a key in ascii or hexadecimal. */ -char *mdbx_dkey(const MDBX_val *key, char *const buf, const size_t bufsize) { - if (!key) - return "<null>"; - if (!buf || bufsize < 4) - return nullptr; - if (!key->iov_len) - return "<empty>"; - - const uint8_t *const data = key->iov_base; - bool is_ascii = true; - unsigned i; - for (i = 0; is_ascii && i < key->iov_len; i++) - if (data[i] < ' ' || data[i] > 127) - is_ascii = false; - - if (is_ascii) { - int len = - snprintf(buf, bufsize, "%.*s", - (key->iov_len > INT_MAX) ? INT_MAX : (int)key->iov_len, data); - assert(len > 0 && (unsigned)len < bufsize); - (void)len; - } else { - char *const detent = buf + bufsize - 2; - char *ptr = buf; - *ptr++ = '<'; - for (i = 0; i < key->iov_len; i++) { - const ptrdiff_t left = detent - ptr; - assert(left > 0); - int len = snprintf(ptr, left, "%02x", data[i]); - if (len < 0 || len >= left) - break; - ptr += len; - } - if (ptr < detent) { - ptr[0] = '>'; - ptr[1] = '\0'; - } - } - return buf; -} - -#if 0 /* LY: debug stuff */ -static const char *mdbx_leafnode_type(MDBX_node *n) { - static char *const tp[2][2] = {{"", ": DB"}, {": sub-page", ": sub-DB"}}; - return F_ISSET(n->mn_flags, F_BIGDATA) ? ": overflow page" - : tp[F_ISSET(n->mn_flags, F_DUPDATA)] - [F_ISSET(n->mn_flags, F_SUBDATA)]; -} - -/* Display all the keys in the page. */ -static void mdbx_page_list(MDBX_page *mp) { - pgno_t pgno = mp->mp_pgno; - const char *type, *state = (mp->mp_flags & P_DIRTY) ? ", dirty" : ""; - MDBX_node *node; - unsigned i, nkeys, nsize, total = 0; - MDBX_val key; - DKBUF; - - switch (mp->mp_flags & - (P_BRANCH | P_LEAF | P_LEAF2 | P_META | P_OVERFLOW | P_SUBP)) { - case P_BRANCH: - type = "Branch page"; - break; - case P_LEAF: - type = "Leaf page"; - break; - case P_LEAF | P_SUBP: - type = "Sub-page"; - break; - case P_LEAF | P_LEAF2: - type = "LEAF2 page"; - break; - case P_LEAF | P_LEAF2 | P_SUBP: - type = "LEAF2 sub-page"; - break; - case P_OVERFLOW: - mdbx_print("Overflow page %" PRIu64 " pages %u%s\n", pgno, mp->mp_pages, - state); - return; - case P_META: - mdbx_print("Meta-page %" PRIu64 " txnid %" PRIu64 "\n", pgno, - ((MDBX_meta *)PAGEDATA(mp))->mm_txnid); - return; - default: - mdbx_print("Bad page %" PRIu64 " flags 0x%X\n", pgno, mp->mp_flags); - return; - } - - nkeys = NUMKEYS(mp); - mdbx_print("%s %" PRIu64 " numkeys %u%s\n", type, pgno, nkeys, state); - - for (i = 0; i < nkeys; i++) { - if (IS_LEAF2(mp)) { /* LEAF2 pages have no mp_ptrs[] or node headers */ - key.iov_len = nsize = mp->mp_leaf2_ksize; - key.iov_base = LEAF2KEY(mp, i, nsize); - total += nsize; - mdbx_print("key %u: nsize %u, %s\n", i, nsize, DKEY(&key)); - continue; - } - node = NODEPTR(mp, i); - key.iov_len = node->mn_ksize; - key.iov_base = node->mn_data; - nsize = NODESIZE + key.iov_len; - if (IS_BRANCH(mp)) { - mdbx_print("key %u: page %" PRIu64 ", %s\n", i, NODEPGNO(node), - DKEY(&key)); - total += nsize; - } else { - if (F_ISSET(node->mn_flags, F_BIGDATA)) - nsize += sizeof(pgno_t); - else - nsize += NODEDSZ(node); - total += nsize; - nsize += sizeof(indx_t); - mdbx_print("key %u: nsize %u, %s%s\n", i, nsize, DKEY(&key), - mdbx_leafnode_type(node)); - } - total = EVEN(total); - } - mdbx_print("Total: header %u + contents %u + unused %u\n", - IS_LEAF2(mp) ? PAGEHDRSZ : PAGEHDRSZ + mp->mp_lower, total, - SIZELEFT(mp)); -} - -static void mdbx_cursor_chk(MDBX_cursor *mc) { - unsigned i; - MDBX_node *node; - MDBX_page *mp; - - if (!mc->mc_snum || !(mc->mc_flags & C_INITIALIZED)) - return; - for (i = 0; i < mc->mc_top; i++) { - mp = mc->mc_pg[i]; - node = NODEPTR(mp, mc->mc_ki[i]); - if (unlikely(NODEPGNO(node) != mc->mc_pg[i + 1]->mp_pgno)) - mdbx_print("oops!\n"); - } - if (unlikely(mc->mc_ki[i] >= NUMKEYS(mc->mc_pg[i]))) - mdbx_print("ack!\n"); - if (XCURSOR_INITED(mc)) { - node = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]); - if (((node->mn_flags & (F_DUPDATA | F_SUBDATA)) == F_DUPDATA) && - mc->mc_xcursor->mx_cursor.mc_pg[0] != NODEDATA(node)) { - mdbx_print("blah!\n"); - } - } -} -#endif /* 0 */ - -/* Count all the pages in each DB and in the freelist and make sure - * it matches the actual number of pages being used. - * All named DBs must be open for a correct count. */ -static void mdbx_audit(MDBX_txn *txn) { - MDBX_cursor mc; - MDBX_val key, data; - int rc; - - pgno_t freecount = 0; - mdbx_cursor_init(&mc, txn, FREE_DBI, NULL); - while ((rc = mdbx_cursor_get(&mc, &key, &data, MDBX_NEXT)) == 0) - freecount += *(pgno_t *)data.iov_base; - mdbx_tassert(txn, rc == MDBX_NOTFOUND); - - pgno_t count = 0; - for (MDBX_dbi i = 0; i < txn->mt_numdbs; i++) { - MDBX_xcursor mx; - if (!(txn->mt_dbflags[i] & DB_VALID)) - continue; - mdbx_cursor_init(&mc, txn, i, &mx); - if (txn->mt_dbs[i].md_root == P_INVALID) - continue; - count += txn->mt_dbs[i].md_branch_pages + txn->mt_dbs[i].md_leaf_pages + - txn->mt_dbs[i].md_overflow_pages; - if (txn->mt_dbs[i].md_flags & MDBX_DUPSORT) { - rc = mdbx_page_search(&mc, NULL, MDBX_PS_FIRST); - for (; rc == MDBX_SUCCESS; rc = mdbx_cursor_sibling(&mc, 1)) { - MDBX_page *mp = mc.mc_pg[mc.mc_top]; - for (unsigned j = 0; j < NUMKEYS(mp); j++) { - MDBX_node *leaf = NODEPTR(mp, j); - if (leaf->mn_flags & F_SUBDATA) { - MDBX_db db; - memcpy(&db, NODEDATA(leaf), sizeof(db)); - count += - db.md_branch_pages + db.md_leaf_pages + db.md_overflow_pages; - } - } - } - mdbx_tassert(txn, rc == MDBX_NOTFOUND); - } - } - if (freecount + count + NUM_METAS != txn->mt_next_pgno) { - mdbx_print("audit: %" PRIaTXN " freecount: %" PRIaPGNO " count: %" PRIaPGNO - " total: %" PRIaPGNO " next_pgno: %" PRIaPGNO "\n", - txn->mt_txnid, freecount, count + NUM_METAS, - freecount + count + NUM_METAS, txn->mt_next_pgno); - } -} - -int mdbx_cmp(MDBX_txn *txn, MDBX_dbi dbi, const MDBX_val *a, - const MDBX_val *b) { - mdbx_assert(NULL, txn->mt_signature == MDBX_MT_SIGNATURE); - return txn->mt_dbxs[dbi].md_cmp(a, b); -} - -int mdbx_dcmp(MDBX_txn *txn, MDBX_dbi dbi, const MDBX_val *a, - const MDBX_val *b) { - mdbx_assert(NULL, txn->mt_signature == MDBX_MT_SIGNATURE); - return txn->mt_dbxs[dbi].md_dcmp(a, b); -} - -/* Allocate memory for a page. - * Re-use old malloc'd pages first for singletons, otherwise just malloc. - * Set MDBX_TXN_ERROR on failure. */ -static MDBX_page *mdbx_page_malloc(MDBX_txn *txn, unsigned num) { - MDBX_env *env = txn->mt_env; - MDBX_page *np = env->me_dpages; - size_t size = env->me_psize; - if (likely(num == 1 && np)) { - ASAN_UNPOISON_MEMORY_REGION(np, size); - VALGRIND_MEMPOOL_ALLOC(env, np, size); - VALGRIND_MAKE_MEM_DEFINED(&np->mp_next, sizeof(np->mp_next)); - env->me_dpages = np->mp_next; - } else { - size = pgno2bytes(env, num); - np = malloc(size); - if (unlikely(!np)) { - txn->mt_flags |= MDBX_TXN_ERROR; - return np; - } - VALGRIND_MEMPOOL_ALLOC(env, np, size); - } - - if ((env->me_flags & MDBX_NOMEMINIT) == 0) { - /* For a single page alloc, we init everything after the page header. - * For multi-page, we init the final page; if the caller needed that - * many pages they will be filling in at least up to the last page. */ - size_t skip = PAGEHDRSZ; - if (num > 1) - skip += pgno2bytes(env, num - 1); - memset((char *)np + skip, 0, size - skip); - } -#if MDBX_DEBUG - np->mp_pgno = 0; -#endif - VALGRIND_MAKE_MEM_UNDEFINED(np, size); - np->mp_flags = 0; - np->mp_pages = num; - return np; -} - -/* Free a single page. - * Saves single pages to a list, for future reuse. - * (This is not used for multi-page overflow pages.) */ -static __inline void mdbx_page_free(MDBX_env *env, MDBX_page *mp) { -#if MDBX_DEBUG - mp->mp_pgno = MAX_PAGENO; -#endif - mp->mp_next = env->me_dpages; - VALGRIND_MEMPOOL_FREE(env, mp); - env->me_dpages = mp; -} - -/* Free a dirty page */ -static void mdbx_dpage_free(MDBX_env *env, MDBX_page *dp) { - if (!IS_OVERFLOW(dp) || dp->mp_pages == 1) { - mdbx_page_free(env, dp); - } else { - /* large pages just get freed directly */ - VALGRIND_MEMPOOL_FREE(env, dp); - free(dp); - } -} - -/* Return all dirty pages to dpage list */ -static void mdbx_dlist_free(MDBX_txn *txn) { - MDBX_env *env = txn->mt_env; - MDBX_ID2L dl = txn->mt_rw_dirtylist; - size_t i, n = dl[0].mid; - - for (i = 1; i <= n; i++) - mdbx_dpage_free(env, dl[i].mptr); - - dl[0].mid = 0; -} - -static size_t bytes_align2os_bytes(const MDBX_env *env, size_t bytes) { - return mdbx_roundup2(mdbx_roundup2(bytes, env->me_psize), env->me_os_psize); -} - -static void __cold mdbx_kill_page(MDBX_env *env, pgno_t pgno) { - const size_t offs = pgno2bytes(env, pgno); - const size_t shift = offsetof(MDBX_page, mp_pages); - - if (env->me_flags & MDBX_WRITEMAP) { - MDBX_page *mp = (MDBX_page *)(env->me_map + offs); - memset(&mp->mp_pages, 0x6F /* 'o', 111 */, env->me_psize - shift); - VALGRIND_MAKE_MEM_NOACCESS(&mp->mp_pages, env->me_psize - shift); - ASAN_POISON_MEMORY_REGION(&mp->mp_pages, env->me_psize - shift); - } else { - intptr_t len = env->me_psize - shift; - void *buf = alloca(len); - memset(buf, 0x6F /* 'o', 111 */, len); - (void)mdbx_pwrite(env->me_fd, buf, len, offs + shift); - } -} - -/* Loosen or free a single page. - * - * Saves single pages to a list for future reuse - * in this same txn. It has been pulled from the freeDB - * and already resides on the dirty list, but has been - * deleted. Use these pages first before pulling again - * from the freeDB. - * - * If the page wasn't dirtied in this txn, just add it - * to this txn's free list. */ -static int mdbx_page_loose(MDBX_cursor *mc, MDBX_page *mp) { - int loose = 0; - const pgno_t pgno = mp->mp_pgno; - MDBX_txn *txn = mc->mc_txn; - - if ((mp->mp_flags & P_DIRTY) && mc->mc_dbi != FREE_DBI) { - if (txn->mt_parent) { - mdbx_cassert(mc, (txn->mt_env->me_flags & MDBX_WRITEMAP) == 0); - MDBX_ID2 *dl = txn->mt_rw_dirtylist; - /* If txn has a parent, - * make sure the page is in our dirty list. */ - if (dl[0].mid) { - unsigned x = mdbx_mid2l_search(dl, pgno); - if (x <= dl[0].mid && dl[x].mid == pgno) { - if (unlikely(mp != dl[x].mptr)) { /* bad cursor? */ - mdbx_error("wrong page 0x%p #%" PRIaPGNO - " in the dirtylist[%d], expecting %p", - dl[x].mptr, pgno, x, mp); - mc->mc_flags &= ~(C_INITIALIZED | C_EOF); - txn->mt_flags |= MDBX_TXN_ERROR; - return MDBX_PROBLEM; - } - /* ok, it's ours */ - loose = 1; - } - } - } else { - /* no parent txn, so it's just ours */ - loose = 1; - } - } - if (loose) { - mdbx_debug("loosen db %d page %" PRIaPGNO, DDBI(mc), mp->mp_pgno); - MDBX_page **link = &NEXT_LOOSE_PAGE(mp); - if (unlikely(txn->mt_env->me_flags & MDBX_PAGEPERTURB)) { - mdbx_kill_page(txn->mt_env, pgno); - VALGRIND_MAKE_MEM_UNDEFINED(link, sizeof(MDBX_page *)); - ASAN_UNPOISON_MEMORY_REGION(link, sizeof(MDBX_page *)); - } - *link = txn->mt_loose_pages; - txn->mt_loose_pages = mp; - txn->mt_loose_count++; - mp->mp_flags |= P_LOOSE; - } else { - int rc = mdbx_pnl_append(&txn->mt_befree_pages, pgno); - if (unlikely(rc)) - return rc; - } - - return MDBX_SUCCESS; -} - -/* Set or clear P_KEEP in dirty, non-overflow, non-sub pages watched by txn. - * - * [in] mc A cursor handle for the current operation. - * [in] pflags Flags of the pages to update: - * - P_DIRTY to set P_KEEP, - * - P_DIRTY|P_KEEP to clear it. - * [in] all No shortcuts. Needed except after a full mdbx_page_flush(). - * - * Returns 0 on success, non-zero on failure. */ -static int mdbx_pages_xkeep(MDBX_cursor *mc, unsigned pflags, bool all) { - const unsigned Mask = P_SUBP | P_DIRTY | P_LOOSE | P_KEEP; - MDBX_txn *txn = mc->mc_txn; - MDBX_cursor *m3, *m0 = mc; - MDBX_xcursor *mx; - MDBX_page *dp, *mp; - MDBX_node *leaf; - unsigned i, j; - int rc = MDBX_SUCCESS, level; - - /* Mark pages seen by cursors: First m0, then tracked cursors */ - for (i = txn->mt_numdbs;;) { - if (mc->mc_flags & C_INITIALIZED) { - for (m3 = mc;; m3 = &mx->mx_cursor) { - mp = NULL; - for (j = 0; j < m3->mc_snum; j++) { - mp = m3->mc_pg[j]; - if ((mp->mp_flags & Mask) == pflags) - mp->mp_flags ^= P_KEEP; - } - mx = m3->mc_xcursor; - /* Proceed to mx if it is at a sub-database */ - if (!(mx && (mx->mx_cursor.mc_flags & C_INITIALIZED))) - break; - if (!(mp && (mp->mp_flags & P_LEAF))) - break; - leaf = NODEPTR(mp, m3->mc_ki[j - 1]); - if (!(leaf->mn_flags & F_SUBDATA)) - break; - } - } - mc = mc->mc_next; - for (; !mc || mc == m0; mc = txn->mt_cursors[--i]) - if (i == 0) - goto mark_done; - } - -mark_done: - if (all) { - /* Mark dirty root pages */ - for (i = 0; i < txn->mt_numdbs; i++) { - if (txn->mt_dbflags[i] & DB_DIRTY) { - pgno_t pgno = txn->mt_dbs[i].md_root; - if (pgno == P_INVALID) - continue; - if (unlikely((rc = mdbx_page_get(m0, pgno, &dp, &level)) != - MDBX_SUCCESS)) - break; - if ((dp->mp_flags & Mask) == pflags && level <= 1) - dp->mp_flags ^= P_KEEP; - } - } - } - - return rc; -} - -static int mdbx_page_flush(MDBX_txn *txn, pgno_t keep); - -/* Spill pages from the dirty list back to disk. - * This is intended to prevent running into MDBX_TXN_FULL situations, - * but note that they may still occur in a few cases: - * - * 1) our estimate of the txn size could be too small. Currently this - * seems unlikely, except with a large number of MDBX_MULTIPLE items. - * - * 2) child txns may run out of space if their parents dirtied a - * lot of pages and never spilled them. TODO: we probably should do - * a preemptive spill during mdbx_txn_begin() of a child txn, if - * the parent's dirtyroom is below a given threshold. - * - * Otherwise, if not using nested txns, it is expected that apps will - * not run into MDBX_TXN_FULL any more. The pages are flushed to disk - * the same way as for a txn commit, e.g. their P_DIRTY flag is cleared. - * If the txn never references them again, they can be left alone. - * If the txn only reads them, they can be used without any fuss. - * If the txn writes them again, they can be dirtied immediately without - * going thru all of the work of mdbx_page_touch(). Such references are - * handled by mdbx_page_unspill(). - * - * Also note, we never spill DB root pages, nor pages of active cursors, - * because we'll need these back again soon anyway. And in nested txns, - * we can't spill a page in a child txn if it was already spilled in a - * parent txn. That would alter the parent txns' data even though - * the child hasn't committed yet, and we'd have no way to undo it if - * the child aborted. - * - * [in] m0 cursor A cursor handle identifying the transaction and - * database for which we are checking space. - * [in] key For a put operation, the key being stored. - * [in] data For a put operation, the data being stored. - * - * Returns 0 on success, non-zero on failure. */ -static int mdbx_page_spill(MDBX_cursor *m0, MDBX_val *key, MDBX_val *data) { - MDBX_txn *txn = m0->mc_txn; - MDBX_ID2L dl = txn->mt_rw_dirtylist; - - if (m0->mc_flags & C_SUB) - return MDBX_SUCCESS; - - /* Estimate how much space this op will take */ - pgno_t i = m0->mc_db->md_depth; - /* Named DBs also dirty the main DB */ - if (m0->mc_dbi >= CORE_DBS) - i += txn->mt_dbs[MAIN_DBI].md_depth; - /* For puts, roughly factor in the key+data size */ - if (key) - i += bytes2pgno(txn->mt_env, LEAFSIZE(key, data) + txn->mt_env->me_psize); - i += i; /* double it for good measure */ - pgno_t need = i; - - if (txn->mt_dirtyroom > i) - return MDBX_SUCCESS; - - if (!txn->mt_spill_pages) { - txn->mt_spill_pages = mdbx_pnl_alloc(MDBX_PNL_UM_MAX); - if (unlikely(!txn->mt_spill_pages)) - return MDBX_ENOMEM; - } else { - /* purge deleted slots */ - MDBX_PNL sl = txn->mt_spill_pages; - pgno_t num = sl[0], j = 0; - for (i = 1; i <= num; i++) { - if (!(sl[i] & 1)) - sl[++j] = sl[i]; - } - sl[0] = j; - } - - /* Preserve pages which may soon be dirtied again */ - int rc = mdbx_pages_xkeep(m0, P_DIRTY, true); - if (unlikely(rc != MDBX_SUCCESS)) - goto bailout; - - /* Less aggressive spill - we originally spilled the entire dirty list, - * with a few exceptions for cursor pages and DB root pages. But this - * turns out to be a lot of wasted effort because in a large txn many - * of those pages will need to be used again. So now we spill only 1/8th - * of the dirty pages. Testing revealed this to be a good tradeoff, - * better than 1/2, 1/4, or 1/10. */ - if (need < MDBX_PNL_UM_MAX / 8) - need = MDBX_PNL_UM_MAX / 8; - - /* Save the page IDs of all the pages we're flushing */ - /* flush from the tail forward, this saves a lot of shifting later on. */ - for (i = dl[0].mid; i && need; i--) { - pgno_t pn = dl[i].mid << 1; - MDBX_page *dp = dl[i].mptr; - if (dp->mp_flags & (P_LOOSE | P_KEEP)) - continue; - /* Can't spill twice, - * make sure it's not already in a parent's spill list. */ - if (txn->mt_parent) { - MDBX_txn *tx2; - for (tx2 = txn->mt_parent; tx2; tx2 = tx2->mt_parent) { - if (tx2->mt_spill_pages) { - unsigned j = mdbx_pnl_search(tx2->mt_spill_pages, pn); - if (j <= tx2->mt_spill_pages[0] && tx2->mt_spill_pages[j] == pn) { - dp->mp_flags |= P_KEEP; - break; - } - } - } - if (tx2) - continue; - } - rc = mdbx_pnl_append(&txn->mt_spill_pages, pn); - if (unlikely(rc != MDBX_SUCCESS)) - goto bailout; - need--; - } - mdbx_pnl_sort(txn->mt_spill_pages); - - /* Flush the spilled part of dirty list */ - rc = mdbx_page_flush(txn, i); - if (unlikely(rc != MDBX_SUCCESS)) - goto bailout; - - /* Reset any dirty pages we kept that page_flush didn't see */ - rc = mdbx_pages_xkeep(m0, P_DIRTY | P_KEEP, i != 0); - -bailout: - txn->mt_flags |= rc ? MDBX_TXN_ERROR : MDBX_TXN_SPILLS; - return rc; -} - -/*----------------------------------------------------------------------------*/ - -#define METAPAGE(env, n) (&pgno2page(env, n)->mp_meta) - -#define METAPAGE_END(env) METAPAGE(env, NUM_METAS) - -static __inline txnid_t meta_txnid(const MDBX_env *env, const MDBX_meta *meta, - bool allow_volatile) { - mdbx_assert(env, meta >= METAPAGE(env, 0) || meta < METAPAGE_END(env)); - txnid_t a = meta->mm_txnid_a; - txnid_t b = meta->mm_txnid_b; - if (allow_volatile) - return (a == b) ? a : 0; - mdbx_assert(env, a == b); - return a; -} - -static __inline txnid_t mdbx_meta_txnid_stable(const MDBX_env *env, - const MDBX_meta *meta) { - return meta_txnid(env, meta, false); -} - -static __inline txnid_t mdbx_meta_txnid_fluid(const MDBX_env *env, - const MDBX_meta *meta) { - return meta_txnid(env, meta, true); -} - -static __inline void mdbx_meta_update_begin(const MDBX_env *env, - MDBX_meta *meta, txnid_t txnid) { - mdbx_assert(env, meta >= METAPAGE(env, 0) || meta < METAPAGE_END(env)); - mdbx_assert(env, meta->mm_txnid_a < txnid && meta->mm_txnid_b < txnid); - meta->mm_txnid_a = txnid; - (void)env; - mdbx_coherent_barrier(); -} - -static __inline void mdbx_meta_update_end(const MDBX_env *env, MDBX_meta *meta, - txnid_t txnid) { - mdbx_assert(env, meta >= METAPAGE(env, 0) || meta < METAPAGE_END(env)); - mdbx_assert(env, meta->mm_txnid_a == txnid); - mdbx_assert(env, meta->mm_txnid_b < txnid); - - mdbx_jitter4testing(true); - meta->mm_txnid_b = txnid; - mdbx_coherent_barrier(); -} - -static __inline void mdbx_meta_set_txnid(const MDBX_env *env, MDBX_meta *meta, - txnid_t txnid) { - mdbx_assert(env, meta < METAPAGE(env, 0) || meta > METAPAGE_END(env)); - meta->mm_txnid_a = txnid; - meta->mm_txnid_b = txnid; -} - -static __inline uint64_t mdbx_meta_sign(const MDBX_meta *meta) { - uint64_t sign = MDBX_DATASIGN_NONE; -#if 0 /* TODO */ - sign = hippeus_hash64(...); -#else - (void)meta; -#endif - /* LY: newer returns MDBX_DATASIGN_NONE or MDBX_DATASIGN_WEAK */ - return (sign > MDBX_DATASIGN_WEAK) ? sign : ~sign; -} - -enum meta_choise_mode { prefer_last, prefer_noweak, prefer_steady }; - -static __inline bool mdbx_meta_ot(const enum meta_choise_mode mode, - const MDBX_env *env, const MDBX_meta *a, - const MDBX_meta *b) { - mdbx_jitter4testing(true); - txnid_t txnid_a = mdbx_meta_txnid_fluid(env, a); - txnid_t txnid_b = mdbx_meta_txnid_fluid(env, b); - - mdbx_jitter4testing(true); - switch (mode) { - default: - assert(false); - __unreachable(); - /* fall through */ - __fallthrough; - case prefer_steady: - if (META_IS_STEADY(a) != META_IS_STEADY(b)) - return META_IS_STEADY(b); - /* fall through */ - __fallthrough; - case prefer_noweak: - if (META_IS_WEAK(a) != META_IS_WEAK(b)) - return !META_IS_WEAK(b); - /* fall through */ - __fallthrough; - case prefer_last: - mdbx_jitter4testing(true); - if (txnid_a == txnid_b) - return META_IS_STEADY(b) || (META_IS_WEAK(a) && !META_IS_WEAK(b)); - return txnid_a < txnid_b; - } -} - -static __inline bool mdbx_meta_eq(const MDBX_env *env, const MDBX_meta *a, - const MDBX_meta *b) { - mdbx_jitter4testing(true); - const txnid_t txnid = mdbx_meta_txnid_fluid(env, a); - if (!txnid || txnid != mdbx_meta_txnid_fluid(env, b)) - return false; - - mdbx_jitter4testing(true); - if (META_IS_STEADY(a) != META_IS_STEADY(b)) - return false; - - mdbx_jitter4testing(true); - return true; -} - -static int mdbx_meta_eq_mask(const MDBX_env *env) { - MDBX_meta *m0 = METAPAGE(env, 0); - MDBX_meta *m1 = METAPAGE(env, 1); - MDBX_meta *m2 = METAPAGE(env, 2); - - int rc = mdbx_meta_eq(env, m0, m1) ? 1 : 0; - if (mdbx_meta_eq(env, m1, m2)) - rc += 2; - if (mdbx_meta_eq(env, m2, m0)) - rc += 4; - return rc; -} - -static __inline MDBX_meta *mdbx_meta_recent(const enum meta_choise_mode mode, - const MDBX_env *env, MDBX_meta *a, - MDBX_meta *b) { - const bool a_older_that_b = mdbx_meta_ot(mode, env, a, b); - mdbx_assert(env, !mdbx_meta_eq(env, a, b)); - return a_older_that_b ? b : a; -} - -static __inline MDBX_meta *mdbx_meta_ancient(const enum meta_choise_mode mode, - const MDBX_env *env, MDBX_meta *a, - MDBX_meta *b) { - const bool a_older_that_b = mdbx_meta_ot(mode, env, a, b); - mdbx_assert(env, !mdbx_meta_eq(env, a, b)); - return a_older_that_b ? a : b; -} - -static __inline MDBX_meta * -mdbx_meta_mostrecent(const enum meta_choise_mode mode, const MDBX_env *env) { - MDBX_meta *m0 = METAPAGE(env, 0); - MDBX_meta *m1 = METAPAGE(env, 1); - MDBX_meta *m2 = METAPAGE(env, 2); - - MDBX_meta *head = mdbx_meta_recent(mode, env, m0, m1); - head = mdbx_meta_recent(mode, env, head, m2); - return head; -} - -static __hot MDBX_meta *mdbx_meta_steady(const MDBX_env *env) { - return mdbx_meta_mostrecent(prefer_steady, env); -} - -static __hot MDBX_meta *mdbx_meta_head(const MDBX_env *env) { - return mdbx_meta_mostrecent(prefer_last, env); -} - -static __hot txnid_t mdbx_reclaiming_detent(const MDBX_env *env) { - if (F_ISSET(env->me_flags, MDBX_UTTERLY_NOSYNC)) - return env->me_txn->mt_txnid - 1; - - return mdbx_meta_txnid_stable(env, mdbx_meta_steady(env)); -} - -static const char *mdbx_durable_str(const MDBX_meta *const meta) { - if (META_IS_WEAK(meta)) - return "Weak"; - if (META_IS_STEADY(meta)) - return (meta->mm_datasync_sign == mdbx_meta_sign(meta)) ? "Steady" - : "Tainted"; - return "Legacy"; -} - -/*----------------------------------------------------------------------------*/ - -/* Find oldest txnid still referenced. */ -static txnid_t mdbx_find_oldest(MDBX_txn *txn) { - mdbx_tassert(txn, (txn->mt_flags & MDBX_RDONLY) == 0); - const MDBX_env *env = txn->mt_env; - MDBX_lockinfo *const lck = env->me_lck; - - const txnid_t edge = mdbx_reclaiming_detent(env); - mdbx_tassert(txn, edge <= txn->mt_txnid - 1); - const txnid_t last_oldest = lck->mti_oldest; - mdbx_tassert(txn, edge >= last_oldest); - if (last_oldest == edge) - return edge; - - const uint32_t nothing_changed = MDBX_STRING_TETRAD("None"); - const uint32_t snap_readers_refresh_flag = lck->mti_readers_refresh_flag; - mdbx_jitter4testing(false); - if (snap_readers_refresh_flag == nothing_changed) - return last_oldest; - - txnid_t oldest = edge; - lck->mti_readers_refresh_flag = nothing_changed; - mdbx_coherent_barrier(); - const unsigned snap_nreaders = lck->mti_numreaders; - for (unsigned i = 0; i < snap_nreaders; ++i) { - if (lck->mti_readers[i].mr_pid) { - /* mdbx_jitter4testing(true); */ - const txnid_t snap = lck->mti_readers[i].mr_txnid; - if (oldest > snap && last_oldest <= /* ignore pending updates */ snap) { - oldest = snap; - if (oldest == last_oldest) - return oldest; - } - } - } - - if (oldest != last_oldest) { - mdbx_notice("update oldest %" PRIaTXN " -> %" PRIaTXN, last_oldest, oldest); - mdbx_tassert(txn, oldest >= lck->mti_oldest); - lck->mti_oldest = oldest; - } - return oldest; -} - -/* Add a page to the txn's dirty list */ -static void mdbx_page_dirty(MDBX_txn *txn, MDBX_page *mp) { - MDBX_ID2 mid; - int rc, (*insert)(MDBX_ID2L, MDBX_ID2 *); - - if (txn->mt_flags & MDBX_TXN_WRITEMAP) { - insert = mdbx_mid2l_append; - } else { - insert = mdbx_mid2l_insert; - } - mid.mid = mp->mp_pgno; - mid.mptr = mp; - rc = insert(txn->mt_rw_dirtylist, &mid); - mdbx_tassert(txn, rc == 0); - txn->mt_dirtyroom--; -} - -static int mdbx_mapresize(MDBX_env *env, const pgno_t size_pgno, - const pgno_t limit_pgno) { -#ifdef USE_VALGRIND - const size_t prev_mapsize = env->me_mapsize; - void *const prev_mapaddr = env->me_map; -#endif - - const size_t limit_bytes = pgno_align2os_bytes(env, limit_pgno); - const size_t size_bytes = pgno_align2os_bytes(env, size_pgno); - - mdbx_info("resize datafile/mapping: " - "present %" PRIuPTR " -> %" PRIuPTR ", " - "limit %" PRIuPTR " -> %" PRIuPTR, - env->me_dbgeo.now, size_bytes, env->me_dbgeo.upper, limit_bytes); - - mdbx_assert(env, limit_bytes >= size_bytes); - mdbx_assert(env, bytes2pgno(env, size_bytes) == size_pgno); - mdbx_assert(env, bytes2pgno(env, limit_bytes) == limit_pgno); - const int rc = - mdbx_mresize(env->me_flags, &env->me_dxb_mmap, size_bytes, limit_bytes); - - if (rc == MDBX_SUCCESS) { - env->me_dbgeo.now = size_bytes; - env->me_dbgeo.upper = limit_bytes; - } else if (rc != MDBX_RESULT_TRUE) { - mdbx_error("failed resize datafile/mapping: " - "present %" PRIuPTR " -> %" PRIuPTR ", " - "limit %" PRIuPTR " -> %" PRIuPTR ", errcode %d", - env->me_dbgeo.now, size_bytes, env->me_dbgeo.upper, limit_bytes, - rc); - return rc; - } else { - mdbx_notice("unable resize datafile/mapping: " - "present %" PRIuPTR " -> %" PRIuPTR ", " - "limit %" PRIuPTR " -> %" PRIuPTR ", errcode %d", - env->me_dbgeo.now, size_bytes, env->me_dbgeo.upper, limit_bytes, - rc); - } - -#ifdef USE_VALGRIND - if (prev_mapsize != env->me_mapsize || prev_mapaddr != env->me_map) { - VALGRIND_DISCARD(env->me_valgrind_handle); - env->me_valgrind_handle = 0; - if (env->me_mapsize) - env->me_valgrind_handle = - VALGRIND_CREATE_BLOCK(env->me_map, env->me_mapsize, "mdbx"); - } -#endif - - if (env->me_txn) { - mdbx_tassert(env->me_txn, size_pgno >= env->me_txn->mt_next_pgno); - env->me_txn->mt_end_pgno = size_pgno; - } - return MDBX_SUCCESS; -} - -/* Allocate page numbers and memory for writing. Maintain me_last_reclaimed, - * me_reclaimed_pglist and mt_next_pgno. Set MDBX_TXN_ERROR on failure. - * - * If there are free pages available from older transactions, they - * are re-used first. Otherwise allocate a new page at mt_next_pgno. - * Do not modify the freedB, just merge freeDB records into me_reclaimed_pglist - * and move me_last_reclaimed to say which records were consumed. Only this - * function can create me_reclaimed_pglist and move - * me_last_reclaimed/mt_next_pgno. - * - * [in] mc cursor A cursor handle identifying the transaction and - * database for which we are allocating. - * [in] num the number of pages to allocate. - * [out] mp Address of the allocated page(s). Requests for multiple pages - * will always be satisfied by a single contiguous chunk of memory. - * - * Returns 0 on success, non-zero on failure.*/ - -#define MDBX_ALLOC_CACHE 1 -#define MDBX_ALLOC_GC 2 -#define MDBX_ALLOC_NEW 4 -#define MDBX_ALLOC_KICK 8 -#define MDBX_ALLOC_ALL \ - (MDBX_ALLOC_CACHE | MDBX_ALLOC_GC | MDBX_ALLOC_NEW | MDBX_ALLOC_KICK) - -static int mdbx_page_alloc(MDBX_cursor *mc, unsigned num, MDBX_page **mp, - int flags) { - int rc; - MDBX_txn *txn = mc->mc_txn; - MDBX_env *env = txn->mt_env; - MDBX_page *np; - - if (likely(flags & MDBX_ALLOC_GC)) { - flags |= env->me_flags & (MDBX_COALESCE | MDBX_LIFORECLAIM); - if (unlikely(mc->mc_flags & C_RECLAIMING)) { - /* If mc is updating the freeDB, then the freelist cannot play - * catch-up with itself by growing while trying to save it. */ - flags &= - ~(MDBX_ALLOC_GC | MDBX_ALLOC_KICK | MDBX_COALESCE | MDBX_LIFORECLAIM); - } - } - - if (likely(flags & MDBX_ALLOC_CACHE)) { - /* If there are any loose pages, just use them */ - assert(mp && num); - if (likely(num == 1 && txn->mt_loose_pages)) { - np = txn->mt_loose_pages; - txn->mt_loose_pages = NEXT_LOOSE_PAGE(np); - txn->mt_loose_count--; - mdbx_debug("db %d use loose page %" PRIaPGNO, DDBI(mc), np->mp_pgno); - ASAN_UNPOISON_MEMORY_REGION(np, env->me_psize); - mdbx_tassert(txn, np->mp_pgno < txn->mt_next_pgno); - mdbx_ensure(env, np->mp_pgno >= NUM_METAS); - *mp = np; - return MDBX_SUCCESS; - } - } - - mdbx_tassert(txn, mdbx_pnl_check(env->me_reclaimed_pglist)); - pgno_t pgno, *repg_list = env->me_reclaimed_pglist; - unsigned repg_pos = 0, repg_len = repg_list ? repg_list[0] : 0; - txnid_t oldest = 0, last = 0; - const unsigned wanna_range = num - 1; - - while (1) { /* oom-kick retry loop */ - /* If our dirty list is already full, we can't do anything */ - if (unlikely(txn->mt_dirtyroom == 0)) { - rc = MDBX_TXN_FULL; - goto fail; - } - - MDBX_cursor recur; - for (MDBX_cursor_op op = MDBX_FIRST;; - op = (flags & MDBX_LIFORECLAIM) ? MDBX_PREV : MDBX_NEXT) { - MDBX_val key, data; - - /* Seek a big enough contiguous page range. - * Prefer pages with lower pgno. */ - mdbx_tassert(txn, mdbx_pnl_check(env->me_reclaimed_pglist)); - if (likely(flags & MDBX_ALLOC_CACHE) && repg_len > wanna_range && - (!(flags & MDBX_COALESCE) || op == MDBX_FIRST)) { -#if MDBX_PNL_ASCENDING - for (repg_pos = 1; repg_pos <= repg_len - wanna_range; ++repg_pos) { - pgno = repg_list[repg_pos]; - if (likely(repg_list[repg_pos + wanna_range - 1] == - pgno + wanna_range - 1)) - goto done; - } -#else - repg_pos = repg_len; - do { - pgno = repg_list[repg_pos]; - if (likely(repg_list[repg_pos - wanna_range] == pgno + wanna_range)) - goto done; - } while (--repg_pos > wanna_range); -#endif /* MDBX_PNL sort-order */ - } - - if (op == MDBX_FIRST) { /* 1st iteration, setup cursor, etc */ - if (unlikely(!(flags & MDBX_ALLOC_GC))) - break /* reclaiming is prohibited for now */; - - /* Prepare to fetch more and coalesce */ - oldest = (flags & MDBX_LIFORECLAIM) ? mdbx_find_oldest(txn) - : env->me_oldest[0]; - mdbx_cursor_init(&recur, txn, FREE_DBI, NULL); - if (flags & MDBX_LIFORECLAIM) { - /* Begin from oldest reader if any */ - if (oldest > 2) { - last = oldest - 1; - op = MDBX_SET_RANGE; - } - } else if (env->me_last_reclaimed) { - /* Continue lookup from env->me_last_reclaimed to oldest reader */ - last = env->me_last_reclaimed; - op = MDBX_SET_RANGE; - } - - key.iov_base = &last; - key.iov_len = sizeof(last); - } - - if (!(flags & MDBX_LIFORECLAIM)) { - /* Do not try fetch more if the record will be too recent */ - if (op != MDBX_FIRST && ++last >= oldest) { - oldest = mdbx_find_oldest(txn); - if (oldest <= last) - break; - } - } - - rc = mdbx_cursor_get(&recur, &key, NULL, op); - if (rc == MDBX_NOTFOUND && (flags & MDBX_LIFORECLAIM)) { - if (op == MDBX_SET_RANGE) - continue; - if (oldest < mdbx_find_oldest(txn)) { - oldest = *env->me_oldest; - last = oldest - 1; - key.iov_base = &last; - key.iov_len = sizeof(last); - op = MDBX_SET_RANGE; - rc = mdbx_cursor_get(&recur, &key, NULL, op); - } - } - if (unlikely(rc)) { - if (rc == MDBX_NOTFOUND) - break; - goto fail; - } - - last = *(txnid_t *)key.iov_base; - if (oldest <= last) { - oldest = mdbx_find_oldest(txn); - if (oldest <= last) { - if (flags & MDBX_LIFORECLAIM) - continue; - break; - } - } - - if (flags & MDBX_LIFORECLAIM) { - /* skip IDs of records that already reclaimed */ - if (txn->mt_lifo_reclaimed) { - unsigned i; - for (i = (unsigned)txn->mt_lifo_reclaimed[0]; i > 0; --i) - if (txn->mt_lifo_reclaimed[i] == last) - break; - if (i) - continue; - } - } - - /* Reading next FreeDB record */ - np = recur.mc_pg[recur.mc_top]; - MDBX_node *leaf = NODEPTR(np, recur.mc_ki[recur.mc_top]); - if (unlikely((rc = mdbx_node_read(&recur, leaf, &data)) != MDBX_SUCCESS)) - goto fail; - - if ((flags & MDBX_LIFORECLAIM) && !txn->mt_lifo_reclaimed) { - txn->mt_lifo_reclaimed = mdbx_txl_alloc(); - if (unlikely(!txn->mt_lifo_reclaimed)) { - rc = MDBX_ENOMEM; - goto fail; - } - } - - /* Append PNL from FreeDB record to me_reclaimed_pglist */ - pgno_t *re_pnl = (pgno_t *)data.iov_base; - mdbx_tassert(txn, re_pnl[0] == 0 || - data.iov_len == (re_pnl[0] + 1) * sizeof(pgno_t)); - mdbx_tassert(txn, mdbx_pnl_check(re_pnl)); - repg_pos = re_pnl[0]; - if (!repg_list) { - if (unlikely(!(env->me_reclaimed_pglist = repg_list = - mdbx_pnl_alloc(repg_pos)))) { - rc = MDBX_ENOMEM; - goto fail; - } - } else { - if (unlikely( - (rc = mdbx_pnl_need(&env->me_reclaimed_pglist, repg_pos)) != 0)) - goto fail; - repg_list = env->me_reclaimed_pglist; - } - - /* Remember ID of FreeDB record */ - if (flags & MDBX_LIFORECLAIM) { - if ((rc = mdbx_txl_append(&txn->mt_lifo_reclaimed, last)) != 0) - goto fail; - } - env->me_last_reclaimed = last; - - if (mdbx_debug_enabled(MDBX_DBG_EXTRA)) { - mdbx_debug_extra("PNL read txn %" PRIaTXN " root %" PRIaPGNO - " num %u, PNL", - last, txn->mt_dbs[FREE_DBI].md_root, repg_pos); - unsigned i; - for (i = repg_pos; i; i--) - mdbx_debug_extra_print(" %" PRIaPGNO "", re_pnl[i]); - mdbx_debug_extra_print("\n"); - } - - /* Merge in descending sorted order */ - mdbx_pnl_xmerge(repg_list, re_pnl); - repg_len = repg_list[0]; - if (unlikely((flags & MDBX_ALLOC_CACHE) == 0)) { - /* Done for a kick-reclaim mode, actually no page needed */ - return MDBX_SUCCESS; - } - - mdbx_tassert(txn, - repg_len == 0 || repg_list[repg_len] < txn->mt_next_pgno); - if (repg_len) { - /* Refund suitable pages into "unallocated" space */ - pgno_t tail = txn->mt_next_pgno; - pgno_t *const begin = repg_list + 1; - pgno_t *const end = begin + repg_len; - pgno_t *higest; -#if MDBX_PNL_ASCENDING - for (higest = end; --higest >= begin;) { -#else - for (higest = begin; higest < end; ++higest) { -#endif /* MDBX_PNL sort-order */ - mdbx_tassert(txn, *higest >= NUM_METAS && *higest < tail); - if (*higest != tail - 1) - break; - tail -= 1; - } - if (tail != txn->mt_next_pgno) { -#if MDBX_PNL_ASCENDING - repg_len = (unsigned)(higest + 1 - begin); -#else - repg_len -= (unsigned)(higest - begin); - for (pgno_t *move = begin; higest < end; ++move, ++higest) - *move = *higest; -#endif /* MDBX_PNL sort-order */ - repg_list[0] = repg_len; - mdbx_info("refunded %" PRIaPGNO " pages: %" PRIaPGNO " -> %" PRIaPGNO, - tail - txn->mt_next_pgno, tail, txn->mt_next_pgno); - txn->mt_next_pgno = tail; - mdbx_tassert(txn, mdbx_pnl_check(env->me_reclaimed_pglist)); - } - } - - /* Don't try to coalesce too much. */ - if (repg_len > MDBX_PNL_UM_SIZE / 2) - break; - if (flags & MDBX_COALESCE) { - if (repg_len /* current size */ >= env->me_maxfree_1pg / 2 || - repg_pos /* prev size */ >= env->me_maxfree_1pg / 4) - flags &= ~MDBX_COALESCE; - } - } - - if ((flags & (MDBX_COALESCE | MDBX_ALLOC_CACHE)) == - (MDBX_COALESCE | MDBX_ALLOC_CACHE) && - repg_len > wanna_range) { -#if MDBX_PNL_ASCENDING - for (repg_pos = 1; repg_pos <= repg_len - wanna_range; ++repg_pos) { - pgno = repg_list[repg_pos]; - if (likely(repg_list[repg_pos + wanna_range - 1] == - pgno + wanna_range - 1)) - goto done; - } -#else - repg_pos = repg_len; - do { - pgno = repg_list[repg_pos]; - if (likely(repg_list[repg_pos - wanna_range] == pgno + wanna_range)) - goto done; - } while (--repg_pos > wanna_range); -#endif /* MDBX_PNL sort-order */ - } - - /* Use new pages from the map when nothing suitable in the freeDB */ - repg_pos = 0; - pgno = txn->mt_next_pgno; - rc = MDBX_MAP_FULL; - const pgno_t next = pgno_add(pgno, num); - if (likely(next <= txn->mt_end_pgno)) { - rc = MDBX_NOTFOUND; - if (likely(flags & MDBX_ALLOC_NEW)) - goto done; - } - - const MDBX_meta *head = mdbx_meta_head(env); - if ((flags & MDBX_ALLOC_GC) && - ((flags & MDBX_ALLOC_KICK) || rc == MDBX_MAP_FULL)) { - MDBX_meta *steady = mdbx_meta_steady(env); - - if (oldest == mdbx_meta_txnid_stable(env, steady) && - !META_IS_STEADY(head) && META_IS_STEADY(steady)) { - /* LY: Here an oom was happened: - * - all pages had allocated; - * - reclaiming was stopped at the last steady-sync; - * - the head-sync is weak. - * Now we need make a sync to resume reclaiming. If both - * MDBX_NOSYNC and MDBX_MAPASYNC flags are set, then assume that - * utterly no-sync write mode was requested. In such case - * don't make a steady-sync, but only a legacy-mode checkpoint, - * just for resume reclaiming only, not for data consistency. */ - - mdbx_debug("kick-gc: head %" PRIaTXN "-%s, tail %" PRIaTXN - "-%s, oldest %" PRIaTXN "", - mdbx_meta_txnid_stable(env, head), mdbx_durable_str(head), - mdbx_meta_txnid_stable(env, steady), - mdbx_durable_str(steady), oldest); - - const unsigned syncflags = F_ISSET(env->me_flags, MDBX_UTTERLY_NOSYNC) - ? env->me_flags - : env->me_flags & MDBX_WRITEMAP; - MDBX_meta meta = *head; - if (mdbx_sync_locked(env, syncflags, &meta) == MDBX_SUCCESS) { - txnid_t snap = mdbx_find_oldest(txn); - if (snap > oldest) - continue; - } - } - - if (rc == MDBX_MAP_FULL && oldest < txn->mt_txnid - 1) { - if (mdbx_oomkick(env, oldest) > oldest) - continue; - } - } - - if (rc == MDBX_MAP_FULL && next < head->mm_geo.upper) { - mdbx_assert(env, next > txn->mt_end_pgno); - pgno_t aligned = pgno_align2os_pgno( - env, pgno_add(next, head->mm_geo.grow - next % head->mm_geo.grow)); - - if (aligned > head->mm_geo.upper) - aligned = head->mm_geo.upper; - mdbx_assert(env, aligned > txn->mt_end_pgno); - - mdbx_info("try growth datafile to %" PRIaPGNO " pages (+%" PRIaPGNO ")", - aligned, aligned - txn->mt_end_pgno); - rc = mdbx_mapresize(env, aligned, head->mm_geo.upper); - if (rc == MDBX_SUCCESS) { - mdbx_tassert(env->me_txn, txn->mt_end_pgno >= next); - if (!mp) - return rc; - goto done; - } - - mdbx_warning("unable growth datafile to %" PRIaPGNO "pages (+%" PRIaPGNO - "), errcode %d", - aligned, aligned - txn->mt_end_pgno, rc); - } - - fail: - mdbx_tassert(txn, mdbx_pnl_check(env->me_reclaimed_pglist)); - if (mp) { - *mp = NULL; - txn->mt_flags |= MDBX_TXN_ERROR; - } - assert(rc); - return rc; - } - -done: - mdbx_tassert(txn, mp && num); - mdbx_ensure(env, pgno >= NUM_METAS); - if (env->me_flags & MDBX_WRITEMAP) { - np = pgno2page(env, pgno); - /* LY: reset no-access flag from mdbx_kill_page() */ - VALGRIND_MAKE_MEM_UNDEFINED(np, pgno2bytes(env, num)); - ASAN_UNPOISON_MEMORY_REGION(np, pgno2bytes(env, num)); - } else { - if (unlikely(!(np = mdbx_page_malloc(txn, num)))) { - rc = MDBX_ENOMEM; - goto fail; - } - } - - if (repg_pos) { - mdbx_tassert(txn, pgno < txn->mt_next_pgno); - mdbx_tassert(txn, pgno == repg_list[repg_pos]); - /* Cutoff allocated pages from me_reclaimed_pglist */ - repg_list[0] = repg_len -= num; - for (unsigned i = repg_pos - num; i < repg_len;) - repg_list[++i] = repg_list[++repg_pos]; - mdbx_tassert(txn, mdbx_pnl_check(env->me_reclaimed_pglist)); - } else { - txn->mt_next_pgno = pgno + num; - mdbx_assert(env, txn->mt_next_pgno <= txn->mt_end_pgno); - } - - if (env->me_flags & MDBX_PAGEPERTURB) - memset(np, 0x71 /* 'q', 113 */, pgno2bytes(env, num)); - VALGRIND_MAKE_MEM_UNDEFINED(np, pgno2bytes(env, num)); - - np->mp_pgno = pgno; - np->mp_leaf2_ksize = 0; - np->mp_flags = 0; - np->mp_pages = num; - mdbx_page_dirty(txn, np); - *mp = np; - - mdbx_tassert(txn, mdbx_pnl_check(env->me_reclaimed_pglist)); - return MDBX_SUCCESS; -} - -/* Copy the used portions of a non-overflow page. - * [in] dst page to copy into - * [in] src page to copy from - * [in] psize size of a page */ -static void mdbx_page_copy(MDBX_page *dst, MDBX_page *src, unsigned psize) { - STATIC_ASSERT(UINT16_MAX > MAX_PAGESIZE - PAGEHDRSZ); - STATIC_ASSERT(MIN_PAGESIZE > PAGEHDRSZ + NODESIZE * 42); - enum { Align = sizeof(pgno_t) }; - indx_t upper = src->mp_upper, lower = src->mp_lower, unused = upper - lower; - - /* If page isn't full, just copy the used portion. Adjust - * alignment so memcpy may copy words instead of bytes. */ - if ((unused &= -Align) && !IS_LEAF2(src)) { - upper = (upper + PAGEHDRSZ) & -Align; - memcpy(dst, src, (lower + PAGEHDRSZ + (Align - 1)) & -Align); - memcpy((pgno_t *)((char *)dst + upper), (pgno_t *)((char *)src + upper), - psize - upper); - } else { - memcpy(dst, src, psize - unused); - } -} - -/* Pull a page off the txn's spill list, if present. - * - * If a page being referenced was spilled to disk in this txn, bring - * it back and make it dirty/writable again. - * - * [in] txn the transaction handle. - * [in] mp the page being referenced. It must not be dirty. - * [out] ret the writable page, if any. - * ret is unchanged if mp wasn't spilled. */ -static int mdbx_page_unspill(MDBX_txn *txn, MDBX_page *mp, MDBX_page **ret) { - MDBX_env *env = txn->mt_env; - const MDBX_txn *tx2; - unsigned x; - pgno_t pgno = mp->mp_pgno, pn = pgno << 1; - - for (tx2 = txn; tx2; tx2 = tx2->mt_parent) { - if (!tx2->mt_spill_pages) - continue; - x = mdbx_pnl_search(tx2->mt_spill_pages, pn); - if (x <= tx2->mt_spill_pages[0] && tx2->mt_spill_pages[x] == pn) { - MDBX_page *np; - int num; - if (txn->mt_dirtyroom == 0) - return MDBX_TXN_FULL; - num = IS_OVERFLOW(mp) ? mp->mp_pages : 1; - if (env->me_flags & MDBX_WRITEMAP) { - np = mp; - } else { - np = mdbx_page_malloc(txn, num); - if (unlikely(!np)) - return MDBX_ENOMEM; - if (unlikely(num > 1)) - memcpy(np, mp, pgno2bytes(env, num)); - else - mdbx_page_copy(np, mp, env->me_psize); - } - mdbx_debug("unspill page %" PRIaPGNO, mp->mp_pgno); - if (tx2 == txn) { - /* If in current txn, this page is no longer spilled. - * If it happens to be the last page, truncate the spill list. - * Otherwise mark it as deleted by setting the LSB. */ - if (x == txn->mt_spill_pages[0]) - txn->mt_spill_pages[0]--; - else - txn->mt_spill_pages[x] |= 1; - } /* otherwise, if belonging to a parent txn, the - * page remains spilled until child commits */ - - mdbx_page_dirty(txn, np); - np->mp_flags |= P_DIRTY; - *ret = np; - break; - } - } - return MDBX_SUCCESS; -} - -/* Touch a page: make it dirty and re-insert into tree with updated pgno. - * Set MDBX_TXN_ERROR on failure. - * - * [in] mc cursor pointing to the page to be touched - * - * Returns 0 on success, non-zero on failure. */ -static int mdbx_page_touch(MDBX_cursor *mc) { - MDBX_page *mp = mc->mc_pg[mc->mc_top], *np; - MDBX_txn *txn = mc->mc_txn; - MDBX_cursor *m2, *m3; - pgno_t pgno; - int rc; - - mdbx_cassert(mc, !IS_OVERFLOW(mp)); - if (!F_ISSET(mp->mp_flags, P_DIRTY)) { - if (txn->mt_flags & MDBX_TXN_SPILLS) { - np = NULL; - rc = mdbx_page_unspill(txn, mp, &np); - if (unlikely(rc)) - goto fail; - if (likely(np)) - goto done; - } - - if (unlikely((rc = mdbx_pnl_need(&txn->mt_befree_pages, 1)) || - (rc = mdbx_page_alloc(mc, 1, &np, MDBX_ALLOC_ALL)))) - goto fail; - pgno = np->mp_pgno; - mdbx_debug("touched db %d page %" PRIaPGNO " -> %" PRIaPGNO, DDBI(mc), - mp->mp_pgno, pgno); - mdbx_cassert(mc, mp->mp_pgno != pgno); - mdbx_pnl_xappend(txn->mt_befree_pages, mp->mp_pgno); - /* Update the parent page, if any, to point to the new page */ - if (mc->mc_top) { - MDBX_page *parent = mc->mc_pg[mc->mc_top - 1]; - MDBX_node *node = NODEPTR(parent, mc->mc_ki[mc->mc_top - 1]); - SETPGNO(node, pgno); - } else { - mc->mc_db->md_root = pgno; - } - } else if (txn->mt_parent && !IS_SUBP(mp)) { - mdbx_tassert(txn, (txn->mt_env->me_flags & MDBX_WRITEMAP) == 0); - MDBX_ID2 mid, *dl = txn->mt_rw_dirtylist; - pgno = mp->mp_pgno; - /* If txn has a parent, make sure the page is in our dirty list. */ - if (dl[0].mid) { - unsigned x = mdbx_mid2l_search(dl, pgno); - if (x <= dl[0].mid && dl[x].mid == pgno) { - if (unlikely(mp != dl[x].mptr)) { /* bad cursor? */ - mdbx_error("wrong page 0x%p #%" PRIaPGNO - " in the dirtylist[%d], expecting %p", - dl[x].mptr, pgno, x, mp); - mc->mc_flags &= ~(C_INITIALIZED | C_EOF); - txn->mt_flags |= MDBX_TXN_ERROR; - return MDBX_PROBLEM; - } - return MDBX_SUCCESS; - } - } - - mdbx_debug("clone db %d page %" PRIaPGNO, DDBI(mc), mp->mp_pgno); - mdbx_cassert(mc, dl[0].mid < MDBX_PNL_UM_MAX); - /* No - copy it */ - np = mdbx_page_malloc(txn, 1); - if (unlikely(!np)) - return MDBX_ENOMEM; - mid.mid = pgno; - mid.mptr = np; - rc = mdbx_mid2l_insert(dl, &mid); - mdbx_cassert(mc, rc == 0); - } else { - return MDBX_SUCCESS; - } - - mdbx_page_copy(np, mp, txn->mt_env->me_psize); - np->mp_pgno = pgno; - np->mp_flags |= P_DIRTY; - -done: - /* Adjust cursors pointing to mp */ - mc->mc_pg[mc->mc_top] = np; - m2 = txn->mt_cursors[mc->mc_dbi]; - if (mc->mc_flags & C_SUB) { - for (; m2; m2 = m2->mc_next) { - m3 = &m2->mc_xcursor->mx_cursor; - if (m3->mc_snum < mc->mc_snum) - continue; - if (m3->mc_pg[mc->mc_top] == mp) - m3->mc_pg[mc->mc_top] = np; - } - } else { - for (; m2; m2 = m2->mc_next) { - if (m2->mc_snum < mc->mc_snum) - continue; - if (m2 == mc) - continue; - if (m2->mc_pg[mc->mc_top] == mp) { - m2->mc_pg[mc->mc_top] = np; - if (XCURSOR_INITED(m2) && IS_LEAF(np)) - XCURSOR_REFRESH(m2, np, m2->mc_ki[mc->mc_top]); - } - } - } - return MDBX_SUCCESS; - -fail: - txn->mt_flags |= MDBX_TXN_ERROR; - return rc; -} - -int mdbx_env_sync(MDBX_env *env, int force) { - if (unlikely(!env)) - return MDBX_EINVAL; - - if (unlikely(env->me_signature != MDBX_ME_SIGNATURE)) - return MDBX_EBADSIGN; - - unsigned flags = env->me_flags & ~MDBX_NOMETASYNC; - if (unlikely(flags & (MDBX_RDONLY | MDBX_FATAL_ERROR))) - return MDBX_EACCESS; - - if (unlikely(!env->me_lck)) - return MDBX_PANIC; - - const bool outside_txn = - (!env->me_txn0 || env->me_txn0->mt_owner != mdbx_thread_self()); - - if (outside_txn) { - int rc = mdbx_txn_lock(env, false); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - } - - MDBX_meta *head = mdbx_meta_head(env); - if (!META_IS_STEADY(head) || env->me_sync_pending) { - - if (force || (env->me_sync_threshold && - env->me_sync_pending >= env->me_sync_threshold)) - flags &= MDBX_WRITEMAP /* clear flags for full steady sync */; - - if (outside_txn && - env->me_sync_pending > - pgno2bytes(env, 16 /* FIXME: define threshold */) && - (flags & MDBX_NOSYNC) == 0) { - assert(((flags ^ env->me_flags) & MDBX_WRITEMAP) == 0); - const size_t usedbytes = pgno_align2os_bytes(env, head->mm_geo.next); - - mdbx_txn_unlock(env); - - /* LY: pre-sync without holding lock to reduce latency for writer(s) */ - int rc = (flags & MDBX_WRITEMAP) - ? mdbx_msync(&env->me_dxb_mmap, 0, usedbytes, - flags & MDBX_MAPASYNC) - : mdbx_filesync(env->me_fd, false); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - - rc = mdbx_txn_lock(env, false); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - - /* LY: head may be changed. */ - head = mdbx_meta_head(env); - } - - if (!META_IS_STEADY(head) || env->me_sync_pending) { - mdbx_debug("meta-head %" PRIaPGNO ", %s, sync_pending %" PRIuPTR, - container_of(head, MDBX_page, mp_data)->mp_pgno, - mdbx_durable_str(head), env->me_sync_pending); - MDBX_meta meta = *head; - int rc = mdbx_sync_locked(env, flags | MDBX_SHRINK_ALLOWED, &meta); - if (unlikely(rc != MDBX_SUCCESS)) { - if (outside_txn) - mdbx_txn_unlock(env); - return rc; - } - } - } - - if (outside_txn) - mdbx_txn_unlock(env); - return MDBX_SUCCESS; -} - -/* Back up parent txn's cursors, then grab the originals for tracking */ -static int mdbx_cursor_shadow(MDBX_txn *src, MDBX_txn *dst) { - MDBX_cursor *mc, *bk; - MDBX_xcursor *mx; - size_t size; - int i; - - for (i = src->mt_numdbs; --i >= 0;) { - if ((mc = src->mt_cursors[i]) != NULL) { - size = sizeof(MDBX_cursor); - if (mc->mc_xcursor) - size += sizeof(MDBX_xcursor); - for (; mc; mc = bk->mc_next) { - bk = malloc(size); - if (unlikely(!bk)) - return MDBX_ENOMEM; - *bk = *mc; - mc->mc_backup = bk; - mc->mc_db = &dst->mt_dbs[i]; - /* Kill pointers into src to reduce abuse: The - * user may not use mc until dst ends. But we need a valid - * txn pointer here for cursor fixups to keep working. */ - mc->mc_txn = dst; - mc->mc_dbflag = &dst->mt_dbflags[i]; - if ((mx = mc->mc_xcursor) != NULL) { - *(MDBX_xcursor *)(bk + 1) = *mx; - mx->mx_cursor.mc_txn = dst; - } - mc->mc_next = dst->mt_cursors[i]; - dst->mt_cursors[i] = mc; - } - } - } - return MDBX_SUCCESS; -} - -/* Close this write txn's cursors, give parent txn's cursors back to parent. - * - * [in] txn the transaction handle. - * [in] merge true to keep changes to parent cursors, false to revert. - * - * Returns 0 on success, non-zero on failure. */ -static void mdbx_cursors_eot(MDBX_txn *txn, unsigned merge) { - MDBX_cursor **cursors = txn->mt_cursors, *mc, *next, *bk; - MDBX_xcursor *mx; - int i; - - for (i = txn->mt_numdbs; --i >= 0;) { - for (mc = cursors[i]; mc; mc = next) { - unsigned stage = mc->mc_signature; - mdbx_ensure(NULL, - stage == MDBX_MC_SIGNATURE || stage == MDBX_MC_WAIT4EOT); - next = mc->mc_next; - if ((bk = mc->mc_backup) != NULL) { - if (merge) { - /* Commit changes to parent txn */ - mc->mc_next = bk->mc_next; - mc->mc_backup = bk->mc_backup; - mc->mc_txn = bk->mc_txn; - mc->mc_db = bk->mc_db; - mc->mc_dbflag = bk->mc_dbflag; - if ((mx = mc->mc_xcursor) != NULL) - mx->mx_cursor.mc_txn = bk->mc_txn; - } else { - /* Abort nested txn */ - *mc = *bk; - if ((mx = mc->mc_xcursor) != NULL) - *mx = *(MDBX_xcursor *)(bk + 1); - } - bk->mc_signature = 0; - free(bk); - } - if (stage == MDBX_MC_WAIT4EOT) { - mc->mc_signature = 0; - free(mc); - } else { - mc->mc_signature = MDBX_MC_READY4CLOSE; - mc->mc_flags = 0 /* reset C_UNTRACK */; - } - } - cursors[i] = NULL; - } -} - -/* Common code for mdbx_txn_begin() and mdbx_txn_renew(). */ -static int mdbx_txn_renew0(MDBX_txn *txn, unsigned flags) { - MDBX_env *env = txn->mt_env; - int rc; - - if (unlikely(env->me_pid != mdbx_getpid())) { - env->me_flags |= MDBX_FATAL_ERROR; - return MDBX_PANIC; - } - - pgno_t upper_pgno = 0; - if (flags & MDBX_TXN_RDONLY) { - txn->mt_flags = MDBX_TXN_RDONLY; - MDBX_reader *r = txn->mt_ro_reader; - if (likely(env->me_flags & MDBX_ENV_TXKEY)) { - mdbx_assert(env, !(env->me_flags & MDBX_NOTLS)); - r = mdbx_thread_rthc_get(env->me_txkey); - if (likely(r)) { - mdbx_assert(env, r->mr_pid == env->me_pid); - mdbx_assert(env, r->mr_tid == mdbx_thread_self()); - } - } else { - mdbx_assert(env, !env->me_lck || (env->me_flags & MDBX_NOTLS)); - } - - if (likely(r)) { - if (unlikely(r->mr_pid != env->me_pid || r->mr_txnid != ~(txnid_t)0)) - return MDBX_BAD_RSLOT; - } else if (env->me_lck) { - unsigned slot, nreaders; - const mdbx_pid_t pid = env->me_pid; - const mdbx_tid_t tid = mdbx_thread_self(); - mdbx_assert(env, env->me_lck->mti_magic_and_version == MDBX_LOCK_MAGIC); - mdbx_assert(env, env->me_lck->mti_os_and_format == MDBX_LOCK_FORMAT); - - rc = mdbx_rdt_lock(env); - if (unlikely(MDBX_IS_ERROR(rc))) - return rc; - rc = MDBX_SUCCESS; - - if (unlikely(env->me_live_reader != pid)) { - rc = mdbx_rpid_set(env); - if (unlikely(rc != MDBX_SUCCESS)) { - mdbx_rdt_unlock(env); - return rc; - } - env->me_live_reader = pid; - } - - while (1) { - nreaders = env->me_lck->mti_numreaders; - for (slot = 0; slot < nreaders; slot++) - if (env->me_lck->mti_readers[slot].mr_pid == 0) - break; - - if (likely(slot < env->me_maxreaders)) - break; - - rc = mdbx_reader_check0(env, true, NULL); - if (rc != MDBX_RESULT_TRUE) { - mdbx_rdt_unlock(env); - return (rc == MDBX_SUCCESS) ? MDBX_READERS_FULL : rc; - } - } - - STATIC_ASSERT(sizeof(MDBX_reader) == MDBX_CACHELINE_SIZE); - STATIC_ASSERT( - offsetof(MDBX_lockinfo, mti_readers) % MDBX_CACHELINE_SIZE == 0); - r = &env->me_lck->mti_readers[slot]; - /* Claim the reader slot, carefully since other code - * uses the reader table un-mutexed: First reset the - * slot, next publish it in mtb.mti_numreaders. After - * that, it is safe for mdbx_env_close() to touch it. - * When it will be closed, we can finally claim it. */ - r->mr_pid = 0; - r->mr_txnid = ~(txnid_t)0; - r->mr_tid = tid; - mdbx_coherent_barrier(); - if (slot == nreaders) - env->me_lck->mti_numreaders = ++nreaders; - if (env->me_close_readers < nreaders) - env->me_close_readers = nreaders; - r->mr_pid = pid; - mdbx_rdt_unlock(env); - - if (likely(env->me_flags & MDBX_ENV_TXKEY)) - mdbx_thread_rthc_set(env->me_txkey, r); - } - - while (1) { - MDBX_meta *const meta = mdbx_meta_head(env); - mdbx_jitter4testing(false); - const txnid_t snap = mdbx_meta_txnid_fluid(env, meta); - mdbx_jitter4testing(false); - if (r) { - r->mr_txnid = snap; - mdbx_jitter4testing(false); - mdbx_assert(env, r->mr_pid == mdbx_getpid()); - //mdbx_assert(env, r->mr_tid == mdbx_thread_self()); - mdbx_assert(env, r->mr_txnid == snap); - mdbx_coherent_barrier(); - env->me_lck->mti_readers_refresh_flag = true; - } - mdbx_jitter4testing(true); - - /* Snap the state from current meta-head */ - txn->mt_txnid = snap; - txn->mt_next_pgno = meta->mm_geo.next; - txn->mt_end_pgno = meta->mm_geo.now; - upper_pgno = meta->mm_geo.upper; - memcpy(txn->mt_dbs, meta->mm_dbs, CORE_DBS * sizeof(MDBX_db)); - txn->mt_canary = meta->mm_canary; - - /* LY: Retry on a race, ITS#7970. */ - mdbx_compiler_barrier(); - if (likely(meta == mdbx_meta_head(env) && - snap == mdbx_meta_txnid_fluid(env, meta) && - snap >= *env->me_oldest)) { - mdbx_jitter4testing(false); - break; - } - } - - if (unlikely(txn->mt_txnid == 0)) { - mdbx_error("environment corrupted by died writer, must shutdown!"); - rc = MDBX_WANNA_RECOVERY; - goto bailout; - } - mdbx_assert(env, txn->mt_txnid >= *env->me_oldest); - txn->mt_ro_reader = r; - txn->mt_dbxs = env->me_dbxs; /* mostly static anyway */ - } else { - /* Not yet touching txn == env->me_txn0, it may be active */ - mdbx_jitter4testing(false); - rc = mdbx_txn_lock(env, F_ISSET(flags, MDBX_TRYTXN)); - if (unlikely(rc)) - return rc; - - mdbx_jitter4testing(false); - MDBX_meta *meta = mdbx_meta_head(env); - mdbx_jitter4testing(false); - txn->mt_canary = meta->mm_canary; - const txnid_t snap = mdbx_meta_txnid_stable(env, meta); - txn->mt_txnid = snap + 1; - if (unlikely(txn->mt_txnid < snap)) { - mdbx_debug("txnid overflow!"); - rc = MDBX_TXN_FULL; - goto bailout; - } - - txn->mt_flags = flags; - txn->mt_child = NULL; - txn->mt_loose_pages = NULL; - txn->mt_loose_count = 0; - txn->mt_dirtyroom = MDBX_PNL_UM_MAX; - txn->mt_rw_dirtylist = env->me_dirtylist; - txn->mt_rw_dirtylist[0].mid = 0; - txn->mt_befree_pages = env->me_free_pgs; - txn->mt_befree_pages[0] = 0; - txn->mt_spill_pages = NULL; - if (txn->mt_lifo_reclaimed) - txn->mt_lifo_reclaimed[0] = 0; - env->me_txn = txn; - memcpy(txn->mt_dbiseqs, env->me_dbiseqs, env->me_maxdbs * sizeof(unsigned)); - /* Copy the DB info and flags */ - memcpy(txn->mt_dbs, meta->mm_dbs, CORE_DBS * sizeof(MDBX_db)); - /* Moved to here to avoid a data race in read TXNs */ - txn->mt_next_pgno = meta->mm_geo.next; - txn->mt_end_pgno = meta->mm_geo.now; - upper_pgno = meta->mm_geo.upper; - } - - /* Setup db info */ - txn->mt_numdbs = env->me_numdbs; - for (unsigned i = CORE_DBS; i < txn->mt_numdbs; i++) { - unsigned x = env->me_dbflags[i]; - txn->mt_dbs[i].md_flags = x & PERSISTENT_FLAGS; - txn->mt_dbflags[i] = - (x & MDBX_VALID) ? DB_VALID | DB_USRVALID | DB_STALE : 0; - } - txn->mt_dbflags[MAIN_DBI] = DB_VALID | DB_USRVALID; - txn->mt_dbflags[FREE_DBI] = DB_VALID; - - if (unlikely(env->me_flags & MDBX_FATAL_ERROR)) { - mdbx_warning("environment had fatal error, must shutdown!"); - rc = MDBX_PANIC; - } else { - const size_t size = pgno2bytes(env, txn->mt_end_pgno); - if (unlikely(size > env->me_mapsize)) { - if (upper_pgno > MAX_PAGENO || - bytes2pgno(env, pgno2bytes(env, upper_pgno)) != upper_pgno) { - rc = MDBX_MAP_RESIZED; - goto bailout; - } - rc = mdbx_mapresize(env, txn->mt_end_pgno, upper_pgno); - if (rc != MDBX_SUCCESS) - goto bailout; - } - txn->mt_owner = mdbx_thread_self(); - return MDBX_SUCCESS; - } -bailout: - assert(rc != MDBX_SUCCESS); - mdbx_txn_end(txn, MDBX_END_SLOT | MDBX_END_FAIL_BEGIN); - return rc; -} - -int mdbx_txn_renew(MDBX_txn *txn) { - int rc; - - if (unlikely(!txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(!F_ISSET(txn->mt_flags, MDBX_TXN_RDONLY | MDBX_TXN_FINISHED))) - return MDBX_EINVAL; - - if (unlikely(txn->mt_owner != 0)) - return MDBX_THREAD_MISMATCH; - - rc = mdbx_txn_renew0(txn, MDBX_TXN_RDONLY); - if (rc == MDBX_SUCCESS) { - txn->mt_owner = mdbx_thread_self(); - mdbx_debug("renew txn %" PRIaTXN "%c %p on env %p, root page %" PRIaPGNO - "/%" PRIaPGNO, - txn->mt_txnid, (txn->mt_flags & MDBX_TXN_RDONLY) ? 'r' : 'w', - (void *)txn, (void *)txn->mt_env, txn->mt_dbs[MAIN_DBI].md_root, - txn->mt_dbs[FREE_DBI].md_root); - } - return rc; -} - -int mdbx_txn_begin(MDBX_env *env, MDBX_txn *parent, unsigned flags, - MDBX_txn **ret) { - MDBX_txn *txn; - MDBX_ntxn *ntxn; - int rc, size, tsize; - - if (unlikely(!env || !ret)) - return MDBX_EINVAL; - - if (unlikely(env->me_signature != MDBX_ME_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(env->me_pid != mdbx_getpid())) { - env->me_flags |= MDBX_FATAL_ERROR; - return MDBX_PANIC; - } - - if (unlikely(!env->me_map)) - return MDBX_EPERM; - - flags &= MDBX_TXN_BEGIN_FLAGS; - flags |= env->me_flags & MDBX_WRITEMAP; - - if (unlikely(env->me_flags & MDBX_RDONLY & - ~flags)) /* write txn in RDONLY env */ - return MDBX_EACCESS; - - if (parent) { - if (unlikely(parent->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EINVAL; - - if (unlikely(parent->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - /* Nested transactions: Max 1 child, write txns only, no writemap */ - flags |= parent->mt_flags; - if (unlikely(flags & (MDBX_RDONLY | MDBX_WRITEMAP | MDBX_TXN_BLOCKED))) { - return (parent->mt_flags & MDBX_TXN_RDONLY) ? MDBX_EINVAL : MDBX_BAD_TXN; - } - /* Child txns save MDBX_pgstate and use own copy of cursors */ - size = env->me_maxdbs * (sizeof(MDBX_db) + sizeof(MDBX_cursor *) + 1); - size += tsize = sizeof(MDBX_ntxn); - } else if (flags & MDBX_RDONLY) { - size = env->me_maxdbs * (sizeof(MDBX_db) + 1); - size += tsize = sizeof(MDBX_txn); - } else { - /* Reuse preallocated write txn. However, do not touch it until - * mdbx_txn_renew0() succeeds, since it currently may be active. */ - txn = env->me_txn0; - goto renew; - } - if (unlikely((txn = calloc(1, size)) == NULL)) { - mdbx_debug("calloc: %s", "failed"); - return MDBX_ENOMEM; - } - txn->mt_dbxs = env->me_dbxs; /* static */ - txn->mt_dbs = (MDBX_db *)((char *)txn + tsize); - txn->mt_dbflags = (uint8_t *)txn + size - env->me_maxdbs; - txn->mt_flags = flags; - txn->mt_env = env; - - if (parent) { - unsigned i; - txn->mt_cursors = (MDBX_cursor **)(txn->mt_dbs + env->me_maxdbs); - txn->mt_dbiseqs = parent->mt_dbiseqs; - txn->mt_rw_dirtylist = malloc(sizeof(MDBX_ID2) * MDBX_PNL_UM_SIZE); - if (!txn->mt_rw_dirtylist || - !(txn->mt_befree_pages = mdbx_pnl_alloc(MDBX_PNL_UM_MAX))) { - free(txn->mt_rw_dirtylist); - free(txn); - return MDBX_ENOMEM; - } - txn->mt_txnid = parent->mt_txnid; - txn->mt_dirtyroom = parent->mt_dirtyroom; - txn->mt_rw_dirtylist[0].mid = 0; - txn->mt_spill_pages = NULL; - txn->mt_next_pgno = parent->mt_next_pgno; - txn->mt_end_pgno = parent->mt_end_pgno; - parent->mt_flags |= MDBX_TXN_HAS_CHILD; - parent->mt_child = txn; - txn->mt_parent = parent; - txn->mt_numdbs = parent->mt_numdbs; - memcpy(txn->mt_dbs, parent->mt_dbs, txn->mt_numdbs * sizeof(MDBX_db)); - /* Copy parent's mt_dbflags, but clear DB_NEW */ - for (i = 0; i < txn->mt_numdbs; i++) - txn->mt_dbflags[i] = parent->mt_dbflags[i] & ~DB_NEW; - rc = 0; - ntxn = (MDBX_ntxn *)txn; - ntxn->mnt_pgstate = - env->me_pgstate; /* save parent me_reclaimed_pglist & co */ - if (env->me_reclaimed_pglist) { - size = MDBX_PNL_SIZEOF(env->me_reclaimed_pglist); - env->me_reclaimed_pglist = mdbx_pnl_alloc(env->me_reclaimed_pglist[0]); - if (likely(env->me_reclaimed_pglist)) - memcpy(env->me_reclaimed_pglist, ntxn->mnt_pgstate.mf_reclaimed_pglist, - size); - else - rc = MDBX_ENOMEM; - } - if (likely(!rc)) - rc = mdbx_cursor_shadow(parent, txn); - if (unlikely(rc)) - mdbx_txn_end(txn, MDBX_END_FAIL_BEGINCHILD); - } else { /* MDBX_RDONLY */ - txn->mt_dbiseqs = env->me_dbiseqs; - renew: - rc = mdbx_txn_renew0(txn, flags); - } - - if (unlikely(rc)) { - if (txn != env->me_txn0) - free(txn); - } else { - txn->mt_signature = MDBX_MT_SIGNATURE; - *ret = txn; - mdbx_debug("begin txn %" PRIaTXN "%c %p on env %p, root page %" PRIaPGNO - "/%" PRIaPGNO, - txn->mt_txnid, (flags & MDBX_RDONLY) ? 'r' : 'w', (void *)txn, - (void *)env, txn->mt_dbs[MAIN_DBI].md_root, - txn->mt_dbs[FREE_DBI].md_root); - } - - return rc; -} - -MDBX_env *mdbx_txn_env(MDBX_txn *txn) { - if (unlikely(!txn || txn->mt_signature != MDBX_MT_SIGNATURE)) - return NULL; - return txn->mt_env; -} - -uint64_t mdbx_txn_id(MDBX_txn *txn) { - if (unlikely(!txn || txn->mt_signature != MDBX_MT_SIGNATURE)) - return ~(txnid_t)0; - return txn->mt_txnid; -} - -/* Export or close DBI handles opened in this txn. */ -static void mdbx_dbis_update(MDBX_txn *txn, int keep) { - MDBX_dbi n = txn->mt_numdbs; - if (n) { - MDBX_env *env = txn->mt_env; - uint8_t *tdbflags = txn->mt_dbflags; - - for (unsigned i = n; --i >= CORE_DBS;) { - if (tdbflags[i] & DB_NEW) { - if (keep) { - env->me_dbflags[i] = txn->mt_dbs[i].md_flags | MDBX_VALID; - } else { - char *ptr = env->me_dbxs[i].md_name.iov_base; - if (ptr) { - env->me_dbxs[i].md_name.iov_base = NULL; - env->me_dbxs[i].md_name.iov_len = 0; - env->me_dbflags[i] = 0; - env->me_dbiseqs[i]++; - free(ptr); - } - } - } - } - if (keep && env->me_numdbs < n) - env->me_numdbs = n; - } -} - -/* End a transaction, except successful commit of a nested transaction. - * May be called twice for readonly txns: First reset it, then abort. - * [in] txn the transaction handle to end - * [in] mode why and how to end the transaction */ -static int mdbx_txn_end(MDBX_txn *txn, unsigned mode) { - MDBX_env *env = txn->mt_env; - static const char *const names[] = MDBX_END_NAMES; - - if (unlikely(txn->mt_env->me_pid != mdbx_getpid())) { - env->me_flags |= MDBX_FATAL_ERROR; - return MDBX_PANIC; - } - - /* Export or close DBI handles opened in this txn */ - mdbx_dbis_update(txn, mode & MDBX_END_UPDATE); - - mdbx_debug("%s txn %" PRIaTXN "%c %p on mdbenv %p, root page %" PRIaPGNO - "/%" PRIaPGNO, - names[mode & MDBX_END_OPMASK], txn->mt_txnid, - (txn->mt_flags & MDBX_TXN_RDONLY) ? 'r' : 'w', (void *)txn, - (void *)env, txn->mt_dbs[MAIN_DBI].md_root, - txn->mt_dbs[FREE_DBI].md_root); - - if (F_ISSET(txn->mt_flags, MDBX_TXN_RDONLY)) { - if (txn->mt_ro_reader) { - txn->mt_ro_reader->mr_txnid = ~(txnid_t)0; - env->me_lck->mti_readers_refresh_flag = true; - if (mode & MDBX_END_SLOT) { - if ((env->me_flags & MDBX_ENV_TXKEY) == 0) - txn->mt_ro_reader->mr_pid = 0; - txn->mt_ro_reader = NULL; - } - } - mdbx_coherent_barrier(); - txn->mt_numdbs = 0; /* prevent further DBI activity */ - txn->mt_flags |= MDBX_TXN_FINISHED; - txn->mt_owner = 0; - } else if (!F_ISSET(txn->mt_flags, MDBX_TXN_FINISHED)) { - pgno_t *pghead = env->me_reclaimed_pglist; - - if (!(mode & MDBX_END_EOTDONE)) /* !(already closed cursors) */ - mdbx_cursors_eot(txn, 0); - if (!(env->me_flags & MDBX_WRITEMAP)) { - mdbx_dlist_free(txn); - } - - if (txn->mt_lifo_reclaimed) { - txn->mt_lifo_reclaimed[0] = 0; - if (txn != env->me_txn0) { - mdbx_txl_free(txn->mt_lifo_reclaimed); - txn->mt_lifo_reclaimed = NULL; - } - } - txn->mt_numdbs = 0; - txn->mt_flags = MDBX_TXN_FINISHED; - - if (!txn->mt_parent) { - mdbx_pnl_shrink(&txn->mt_befree_pages); - env->me_free_pgs = txn->mt_befree_pages; - /* me_pgstate: */ - env->me_reclaimed_pglist = NULL; - env->me_last_reclaimed = 0; - - env->me_txn = NULL; - txn->mt_owner = 0; - txn->mt_signature = 0; - mode = 0; /* txn == env->me_txn0, do not free() it */ - - /* The writer mutex was locked in mdbx_txn_begin. */ - mdbx_txn_unlock(env); - } else { - txn->mt_parent->mt_child = NULL; - txn->mt_parent->mt_flags &= ~MDBX_TXN_HAS_CHILD; - env->me_pgstate = ((MDBX_ntxn *)txn)->mnt_pgstate; - mdbx_pnl_free(txn->mt_befree_pages); - mdbx_pnl_free(txn->mt_spill_pages); - free(txn->mt_rw_dirtylist); - } - - mdbx_pnl_free(pghead); - } - - if (mode & MDBX_END_FREE) { - mdbx_ensure(env, txn != env->me_txn0); - txn->mt_owner = 0; - txn->mt_signature = 0; - free(txn); - } - - return MDBX_SUCCESS; -} - -int mdbx_txn_reset(MDBX_txn *txn) { - if (unlikely(!txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - /* This call is only valid for read-only txns */ - if (unlikely(!(txn->mt_flags & MDBX_TXN_RDONLY))) - return MDBX_EINVAL; - - /* LY: don't close DBI-handles in MDBX mode */ - int rc = mdbx_txn_end(txn, MDBX_END_RESET | MDBX_END_UPDATE); - if (rc == MDBX_SUCCESS) { - assert(txn->mt_signature == MDBX_MT_SIGNATURE); - assert(txn->mt_owner == 0); - } - return rc; -} - -int mdbx_txn_abort(MDBX_txn *txn) { - if (unlikely(!txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != - ((txn->mt_flags & MDBX_TXN_FINISHED) ? 0 : mdbx_thread_self()))) - return MDBX_THREAD_MISMATCH; - - if (F_ISSET(txn->mt_flags, MDBX_TXN_RDONLY)) - /* LY: don't close DBI-handles in MDBX mode */ - return mdbx_txn_end(txn, MDBX_END_ABORT | MDBX_END_UPDATE | MDBX_END_SLOT | - MDBX_END_FREE); - - if (txn->mt_child) - mdbx_txn_abort(txn->mt_child); - - return mdbx_txn_end(txn, MDBX_END_ABORT | MDBX_END_SLOT | MDBX_END_FREE); -} - -static __inline int mdbx_backlog_size(MDBX_txn *txn) { - int reclaimed = txn->mt_env->me_reclaimed_pglist - ? txn->mt_env->me_reclaimed_pglist[0] - : 0; - return reclaimed + txn->mt_loose_count + txn->mt_end_pgno - txn->mt_next_pgno; -} - -/* LY: Prepare a backlog of pages to modify FreeDB itself, - * while reclaiming is prohibited. It should be enough to prevent search - * in mdbx_page_alloc() during a deleting, when freeDB tree is unbalanced. */ -static int mdbx_prep_backlog(MDBX_txn *txn, MDBX_cursor *mc) { - /* LY: extra page(s) for b-tree rebalancing */ - const int extra = (txn->mt_env->me_flags & MDBX_LIFORECLAIM) ? 2 : 1; - - if (mdbx_backlog_size(txn) < mc->mc_db->md_depth + extra) { - int rc = mdbx_cursor_touch(mc); - if (unlikely(rc)) - return rc; - - int backlog; - while (unlikely((backlog = mdbx_backlog_size(txn)) < extra)) { - rc = mdbx_page_alloc(mc, 1, NULL, MDBX_ALLOC_GC); - if (unlikely(rc)) { - if (unlikely(rc != MDBX_NOTFOUND)) - return rc; - break; - } - } - } - - return MDBX_SUCCESS; -} - -/* Save the freelist as of this transaction to the freeDB. - * This changes the freelist. Keep trying until it stabilizes. */ -static int mdbx_freelist_save(MDBX_txn *txn) { - /* env->me_reclaimed_pglist[] can grow and shrink during this call. - * env->me_last_reclaimed and txn->mt_free_pages[] can only grow. - * Page numbers cannot disappear from txn->mt_free_pages[]. */ - MDBX_cursor mc; - MDBX_env *env = txn->mt_env; - int rc, more = 1; - txnid_t cleanup_reclaimed_id = 0, head_id = 0; - pgno_t befree_count = 0; - intptr_t head_room = 0, total_room = 0; - unsigned cleanup_reclaimed_pos = 0, refill_reclaimed_pos = 0; - const bool lifo = (env->me_flags & MDBX_LIFORECLAIM) != 0; - - mdbx_cursor_init(&mc, txn, FREE_DBI, NULL); - - /* MDBX_RESERVE cancels meminit in ovpage malloc (when no WRITEMAP) */ - const intptr_t clean_limit = - (env->me_flags & (MDBX_NOMEMINIT | MDBX_WRITEMAP)) ? SSIZE_MAX - : env->me_maxfree_1pg; - - mdbx_tassert(txn, mdbx_pnl_check(env->me_reclaimed_pglist)); -again_on_freelist_change: - mdbx_tassert(txn, mdbx_pnl_check(env->me_reclaimed_pglist)); - while (1) { - /* Come back here after each Put() in case freelist changed */ - MDBX_val key, data; - - mdbx_tassert(txn, mdbx_pnl_check(env->me_reclaimed_pglist)); - if (!lifo) { - /* If using records from freeDB which we have not yet deleted, - * now delete them and any we reserved for me_reclaimed_pglist. */ - while (cleanup_reclaimed_id < env->me_last_reclaimed) { - rc = mdbx_cursor_first(&mc, &key, NULL); - if (unlikely(rc)) - goto bailout; - rc = mdbx_prep_backlog(txn, &mc); - if (unlikely(rc)) - goto bailout; - cleanup_reclaimed_id = head_id = *(txnid_t *)key.iov_base; - total_room = head_room = 0; - more = 1; - mdbx_tassert(txn, cleanup_reclaimed_id <= env->me_last_reclaimed); - mc.mc_flags |= C_RECLAIMING; - rc = mdbx_cursor_del(&mc, 0); - mc.mc_flags ^= C_RECLAIMING; - if (unlikely(rc)) - goto bailout; - } - } else if (txn->mt_lifo_reclaimed) { - /* LY: cleanup reclaimed records. */ - while (cleanup_reclaimed_pos < txn->mt_lifo_reclaimed[0]) { - cleanup_reclaimed_id = txn->mt_lifo_reclaimed[++cleanup_reclaimed_pos]; - key.iov_base = &cleanup_reclaimed_id; - key.iov_len = sizeof(cleanup_reclaimed_id); - rc = mdbx_cursor_get(&mc, &key, NULL, MDBX_SET); - if (likely(rc != MDBX_NOTFOUND)) { - if (unlikely(rc)) - goto bailout; - rc = mdbx_prep_backlog(txn, &mc); - if (unlikely(rc)) - goto bailout; - mc.mc_flags |= C_RECLAIMING; - rc = mdbx_cursor_del(&mc, 0); - mc.mc_flags ^= C_RECLAIMING; - if (unlikely(rc)) - goto bailout; - } - } - } - - mdbx_tassert(txn, mdbx_pnl_check(env->me_reclaimed_pglist)); - if (txn->mt_loose_pages) { - /* Return loose page numbers to me_reclaimed_pglist, - * though usually none are left at this point. - * The pages themselves remain in dirtylist. */ - if (unlikely(!env->me_reclaimed_pglist) && - !(lifo && env->me_last_reclaimed > 1)) { - /* Put loose page numbers in mt_free_pages, - * since unable to return them to me_reclaimed_pglist. */ - if (unlikely((rc = mdbx_pnl_need(&txn->mt_befree_pages, - txn->mt_loose_count)) != 0)) - return rc; - for (MDBX_page *mp = txn->mt_loose_pages; mp; mp = NEXT_LOOSE_PAGE(mp)) - mdbx_pnl_xappend(txn->mt_befree_pages, mp->mp_pgno); - } else { - /* Room for loose pages + temp PNL with same */ - if ((rc = mdbx_pnl_need(&env->me_reclaimed_pglist, - 2 * txn->mt_loose_count + 1)) != 0) - goto bailout; - MDBX_PNL loose = env->me_reclaimed_pglist + - MDBX_PNL_ALLOCLEN(env->me_reclaimed_pglist) - - txn->mt_loose_count; - unsigned count = 0; - for (MDBX_page *mp = txn->mt_loose_pages; mp; mp = NEXT_LOOSE_PAGE(mp)) - loose[++count] = mp->mp_pgno; - loose[0] = count; - mdbx_pnl_sort(loose); - mdbx_pnl_xmerge(env->me_reclaimed_pglist, loose); - } - - MDBX_ID2L dl = txn->mt_rw_dirtylist; - for (MDBX_page *mp = txn->mt_loose_pages; mp;) { - mdbx_tassert(txn, mp->mp_pgno < txn->mt_next_pgno); - mdbx_ensure(env, mp->mp_pgno >= NUM_METAS); - - unsigned s, d; - for (s = d = 0; ++s <= dl[0].mid;) - if (dl[s].mid != mp->mp_pgno) - dl[++d] = dl[s]; - - dl[0].mid -= 1; - mdbx_tassert(txn, dl[0].mid == d); - - MDBX_page *dp = mp; - mp = NEXT_LOOSE_PAGE(mp); - if ((env->me_flags & MDBX_WRITEMAP) == 0) - mdbx_dpage_free(env, dp); - } - - txn->mt_loose_pages = NULL; - txn->mt_loose_count = 0; - } - - mdbx_tassert(txn, mdbx_pnl_check(env->me_reclaimed_pglist)); - if (env->me_reclaimed_pglist) { - /* Refund suitable pages into "unallocated" space */ - pgno_t tail = txn->mt_next_pgno; - pgno_t *const begin = env->me_reclaimed_pglist + 1; - pgno_t *const end = begin + env->me_reclaimed_pglist[0]; - pgno_t *higest; -#if MDBX_PNL_ASCENDING - for (higest = end; --higest >= begin;) { -#else - for (higest = begin; higest < end; ++higest) { -#endif /* MDBX_PNL sort-order */ - mdbx_tassert(txn, *higest >= NUM_METAS && *higest < tail); - if (*higest != tail - 1) - break; - tail -= 1; - } - if (tail != txn->mt_next_pgno) { -#if MDBX_PNL_ASCENDING - env->me_reclaimed_pglist[0] = (unsigned)(higest + 1 - begin); -#else - env->me_reclaimed_pglist[0] -= (unsigned)(higest - begin); - for (pgno_t *move = begin; higest < end; ++move, ++higest) - *move = *higest; -#endif /* MDBX_PNL sort-order */ - mdbx_info("refunded %" PRIaPGNO " pages: %" PRIaPGNO " -> %" PRIaPGNO, - tail - txn->mt_next_pgno, tail, txn->mt_next_pgno); - txn->mt_next_pgno = tail; - mdbx_tassert(txn, mdbx_pnl_check(env->me_reclaimed_pglist)); - } - } - - /* Save the PNL of pages freed by this txn, to a single record */ - if (befree_count < txn->mt_befree_pages[0]) { - if (unlikely(!befree_count)) { - /* Make sure last page of freeDB is touched and on freelist */ - rc = mdbx_page_search(&mc, NULL, MDBX_PS_LAST | MDBX_PS_MODIFY); - if (unlikely(rc && rc != MDBX_NOTFOUND)) - goto bailout; - } - pgno_t *befree_pages = txn->mt_befree_pages; - /* Write to last page of freeDB */ - key.iov_len = sizeof(txn->mt_txnid); - key.iov_base = &txn->mt_txnid; - do { - befree_count = befree_pages[0]; - data.iov_len = MDBX_PNL_SIZEOF(befree_pages); - rc = mdbx_cursor_put(&mc, &key, &data, MDBX_RESERVE); - if (unlikely(rc)) - goto bailout; - /* Retry if mt_free_pages[] grew during the Put() */ - befree_pages = txn->mt_befree_pages; - } while (befree_count < befree_pages[0]); - - mdbx_pnl_sort(befree_pages); - memcpy(data.iov_base, befree_pages, data.iov_len); - - if (mdbx_debug_enabled(MDBX_DBG_EXTRA)) { - unsigned i = (unsigned)befree_pages[0]; - mdbx_debug_extra("PNL write txn %" PRIaTXN " root %" PRIaPGNO - " num %u, PNL", - txn->mt_txnid, txn->mt_dbs[FREE_DBI].md_root, i); - for (; i; i--) - mdbx_debug_extra_print(" %" PRIaPGNO "", befree_pages[i]); - mdbx_debug_extra_print("\n"); - } - continue; - } - - mdbx_tassert(txn, mdbx_pnl_check(env->me_reclaimed_pglist)); - const intptr_t rpl_len = - (env->me_reclaimed_pglist ? env->me_reclaimed_pglist[0] : 0) + - txn->mt_loose_count; - if (rpl_len && refill_reclaimed_pos == 0) - refill_reclaimed_pos = 1; - - /* Reserve records for me_reclaimed_pglist[]. Split it if multi-page, - * to avoid searching freeDB for a page range. Use keys in - * range [1,me_last_reclaimed]: Smaller than txnid of oldest reader. */ - if (total_room >= rpl_len) { - if (total_room == rpl_len || --more < 0) - break; - } else if (head_room >= (intptr_t)env->me_maxfree_1pg && head_id > 1) { - /* Keep current record (overflow page), add a new one */ - head_id--; - refill_reclaimed_pos++; - head_room = 0; - } - - if (lifo) { - if (refill_reclaimed_pos > - (txn->mt_lifo_reclaimed ? txn->mt_lifo_reclaimed[0] : 0)) { - /* LY: need just a txn-id for save page list. */ - rc = mdbx_page_alloc(&mc, 0, NULL, MDBX_ALLOC_GC | MDBX_ALLOC_KICK); - if (likely(rc == 0)) - /* LY: ok, reclaimed from freedb. */ - continue; - if (unlikely(rc != MDBX_NOTFOUND)) - /* LY: other troubles... */ - goto bailout; - - /* LY: freedb is empty, will look any free txn-id in high2low order. */ - if (unlikely(env->me_last_reclaimed < 1)) { - /* LY: not any txn in the past of freedb. */ - rc = MDBX_MAP_FULL; - goto bailout; - } - - if (unlikely(!txn->mt_lifo_reclaimed)) { - txn->mt_lifo_reclaimed = mdbx_txl_alloc(); - if (unlikely(!txn->mt_lifo_reclaimed)) { - rc = MDBX_ENOMEM; - goto bailout; - } - } - /* LY: append the list. */ - rc = mdbx_txl_append(&txn->mt_lifo_reclaimed, - env->me_last_reclaimed - 1); - if (unlikely(rc)) - goto bailout; - --env->me_last_reclaimed; - /* LY: note that freeDB cleanup is not needed. */ - ++cleanup_reclaimed_pos; - } - mdbx_tassert(txn, txn->mt_lifo_reclaimed != NULL); - head_id = txn->mt_lifo_reclaimed[refill_reclaimed_pos]; - } else { - mdbx_tassert(txn, txn->mt_lifo_reclaimed == NULL); - } - - /* (Re)write {key = head_id, PNL length = head_room} */ - total_room -= head_room; - head_room = rpl_len - total_room; - if (head_room > (intptr_t)env->me_maxfree_1pg && head_id > 1) { - /* Overflow multi-page for part of me_reclaimed_pglist */ - head_room /= (head_id < INT16_MAX) ? (pgno_t)head_id - : INT16_MAX; /* amortize page sizes */ - head_room += env->me_maxfree_1pg - head_room % (env->me_maxfree_1pg + 1); - } else if (head_room < 0) { - /* Rare case, not bothering to delete this record */ - head_room = 0; - continue; - } - key.iov_len = sizeof(head_id); - key.iov_base = &head_id; - data.iov_len = (head_room + 1) * sizeof(pgno_t); - rc = mdbx_cursor_put(&mc, &key, &data, MDBX_RESERVE); - mdbx_tassert(txn, mdbx_pnl_check(env->me_reclaimed_pglist)); - if (unlikely(rc)) - goto bailout; - - /* PNL is initially empty, zero out at least the length */ - pgno_t *pgs = (pgno_t *)data.iov_base; - intptr_t i = head_room > clean_limit ? head_room : 0; - do { - pgs[i] = 0; - } while (--i >= 0); - total_room += head_room; - continue; - } - - mdbx_tassert(txn, - cleanup_reclaimed_pos == - (txn->mt_lifo_reclaimed ? txn->mt_lifo_reclaimed[0] : 0)); - - /* Fill in the reserved me_reclaimed_pglist records */ - rc = MDBX_SUCCESS; - mdbx_tassert(txn, mdbx_pnl_check(env->me_reclaimed_pglist)); - if (env->me_reclaimed_pglist && env->me_reclaimed_pglist[0]) { - MDBX_val key, data; - key.iov_len = data.iov_len = 0; /* avoid MSVC warning */ - key.iov_base = data.iov_base = NULL; - - size_t rpl_left = env->me_reclaimed_pglist[0]; - pgno_t *rpl_end = env->me_reclaimed_pglist + rpl_left; - if (txn->mt_lifo_reclaimed == 0) { - mdbx_tassert(txn, lifo == 0); - rc = mdbx_cursor_first(&mc, &key, &data); - if (unlikely(rc)) - goto bailout; - } else { - mdbx_tassert(txn, lifo != 0); - } - - while (1) { - txnid_t id; - if (txn->mt_lifo_reclaimed == 0) { - mdbx_tassert(txn, lifo == 0); - id = *(txnid_t *)key.iov_base; - mdbx_tassert(txn, id <= env->me_last_reclaimed); - } else { - mdbx_tassert(txn, lifo != 0); - mdbx_tassert(txn, - refill_reclaimed_pos > 0 && - refill_reclaimed_pos <= txn->mt_lifo_reclaimed[0]); - id = txn->mt_lifo_reclaimed[refill_reclaimed_pos--]; - key.iov_base = &id; - key.iov_len = sizeof(id); - rc = mdbx_cursor_get(&mc, &key, &data, MDBX_SET); - if (unlikely(rc)) - goto bailout; - } - mdbx_tassert( - txn, cleanup_reclaimed_pos == - (txn->mt_lifo_reclaimed ? txn->mt_lifo_reclaimed[0] : 0)); - - mdbx_tassert(txn, data.iov_len >= sizeof(pgno_t) * 2); - size_t chunk_len = (data.iov_len / sizeof(pgno_t)) - 1; - if (chunk_len > rpl_left) - chunk_len = rpl_left; - data.iov_len = (chunk_len + 1) * sizeof(pgno_t); - key.iov_base = &id; - key.iov_len = sizeof(id); - - rpl_end -= chunk_len; - data.iov_base = rpl_end; - pgno_t save = rpl_end[0]; - rpl_end[0] = (pgno_t)chunk_len; - mdbx_tassert(txn, mdbx_pnl_check(rpl_end)); - mc.mc_flags |= C_RECLAIMING; - rc = mdbx_cursor_put(&mc, &key, &data, MDBX_CURRENT); - mc.mc_flags ^= C_RECLAIMING; - mdbx_tassert(txn, mdbx_pnl_check(rpl_end)); - mdbx_tassert( - txn, cleanup_reclaimed_pos == - (txn->mt_lifo_reclaimed ? txn->mt_lifo_reclaimed[0] : 0)); - rpl_end[0] = save; - if (unlikely(rc)) - goto bailout; - - rpl_left -= chunk_len; - if (rpl_left == 0) - break; - - if (!lifo) { - rc = mdbx_cursor_next(&mc, &key, &data, MDBX_NEXT); - if (unlikely(rc)) - goto bailout; - } - } - } - -bailout: - if (txn->mt_lifo_reclaimed) { - mdbx_tassert(txn, rc || cleanup_reclaimed_pos == txn->mt_lifo_reclaimed[0]); - if (rc == MDBX_SUCCESS && - cleanup_reclaimed_pos != txn->mt_lifo_reclaimed[0]) { - mdbx_tassert(txn, cleanup_reclaimed_pos < txn->mt_lifo_reclaimed[0]); - /* LY: zeroed cleanup_idx to force cleanup - * and refill created freeDB records. */ - cleanup_reclaimed_pos = 0; - /* LY: restart filling */ - total_room = head_room = refill_reclaimed_pos = 0; - more = 1; - goto again_on_freelist_change; - } - txn->mt_lifo_reclaimed[0] = 0; - if (txn != env->me_txn0) { - mdbx_txl_free(txn->mt_lifo_reclaimed); - txn->mt_lifo_reclaimed = NULL; - } - } - - return rc; -} - -/* Flush (some) dirty pages to the map, after clearing their dirty flag. - * [in] txn the transaction that's being committed - * [in] keep number of initial pages in dirtylist to keep dirty. - * Returns 0 on success, non-zero on failure. */ -static int mdbx_page_flush(MDBX_txn *txn, pgno_t keep) { - MDBX_env *env = txn->mt_env; - MDBX_ID2L dl = txn->mt_rw_dirtylist; - unsigned i, j, pagecount = dl[0].mid; - int rc; - size_t size = 0, pos = 0; - pgno_t pgno = 0; - MDBX_page *dp = NULL; - struct iovec iov[MDBX_COMMIT_PAGES]; - intptr_t wpos = 0, wsize = 0; - size_t next_pos = 1; /* impossible pos, so pos != next_pos */ - int n = 0; - - j = i = keep; - - if (env->me_flags & MDBX_WRITEMAP) { - /* Clear dirty flags */ - while (++i <= pagecount) { - dp = dl[i].mptr; - /* Don't flush this page yet */ - if (dp->mp_flags & (P_LOOSE | P_KEEP)) { - dp->mp_flags &= ~P_KEEP; - dl[++j] = dl[i]; - continue; - } - dp->mp_flags &= ~P_DIRTY; - dp->mp_validator = 0 /* TODO */; - env->me_sync_pending += - IS_OVERFLOW(dp) ? pgno2bytes(env, dp->mp_pages) : env->me_psize; - } - goto done; - } - - /* Write the pages */ - for (;;) { - if (++i <= pagecount) { - dp = dl[i].mptr; - /* Don't flush this page yet */ - if (dp->mp_flags & (P_LOOSE | P_KEEP)) { - dp->mp_flags &= ~P_KEEP; - dl[i].mid = 0; - continue; - } - pgno = dl[i].mid; - /* clear dirty flag */ - dp->mp_flags &= ~P_DIRTY; - dp->mp_validator = 0 /* TODO */; - pos = pgno2bytes(env, pgno); - size = IS_OVERFLOW(dp) ? pgno2bytes(env, dp->mp_pages) : env->me_psize; - env->me_sync_pending += size; - } - /* Write up to MDBX_COMMIT_PAGES dirty pages at a time. */ - if (pos != next_pos || n == MDBX_COMMIT_PAGES || wsize + size > MAX_WRITE) { - if (n) { - /* Write previous page(s) */ - rc = mdbx_pwritev(env->me_fd, iov, n, wpos, wsize); - if (unlikely(rc != MDBX_SUCCESS)) { - mdbx_debug("Write error: %s", strerror(rc)); - return rc; - } - n = 0; - } - if (i > pagecount) - break; - wpos = pos; - wsize = 0; - } - mdbx_debug("committing page %" PRIaPGNO "", pgno); - next_pos = pos + size; - iov[n].iov_len = size; - iov[n].iov_base = (char *)dp; - wsize += size; - n++; - } - - mdbx_invalidate_cache(env->me_map, pgno2bytes(env, txn->mt_next_pgno)); - - for (i = keep; ++i <= pagecount;) { - dp = dl[i].mptr; - /* This is a page we skipped above */ - if (!dl[i].mid) { - dl[++j] = dl[i]; - dl[j].mid = dp->mp_pgno; - continue; - } - mdbx_dpage_free(env, dp); - } - -done: - i--; - txn->mt_dirtyroom += i - j; - dl[0].mid = j; - return MDBX_SUCCESS; -} - -int mdbx_txn_commit(MDBX_txn *txn) { - int rc; - - if (unlikely(txn == NULL)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - MDBX_env *env = txn->mt_env; - if (unlikely(env->me_pid != mdbx_getpid())) { - env->me_flags |= MDBX_FATAL_ERROR; - return MDBX_PANIC; - } - - if (txn->mt_child) { - rc = mdbx_txn_commit(txn->mt_child); - txn->mt_child = NULL; - if (unlikely(rc != MDBX_SUCCESS)) - goto fail; - } - - /* mdbx_txn_end() mode for a commit which writes nothing */ - unsigned end_mode = - MDBX_END_EMPTY_COMMIT | MDBX_END_UPDATE | MDBX_END_SLOT | MDBX_END_FREE; - if (unlikely(F_ISSET(txn->mt_flags, MDBX_TXN_RDONLY))) - goto done; - - if (unlikely(txn->mt_flags & (MDBX_TXN_FINISHED | MDBX_TXN_ERROR))) { - mdbx_debug("error flag is set, can't commit"); - if (txn->mt_parent) - txn->mt_parent->mt_flags |= MDBX_TXN_ERROR; - rc = MDBX_BAD_TXN; - goto fail; - } - - if (txn->mt_parent) { - MDBX_txn *parent = txn->mt_parent; - MDBX_page **lp; - MDBX_ID2L dst, src; - MDBX_PNL pspill; - unsigned i, x, y, len, ps_len; - - /* Append our reclaim list to parent's */ - if (txn->mt_lifo_reclaimed) { - if (parent->mt_lifo_reclaimed) { - rc = mdbx_txl_append_list(&parent->mt_lifo_reclaimed, - txn->mt_lifo_reclaimed); - if (unlikely(rc != MDBX_SUCCESS)) - goto fail; - mdbx_txl_free(txn->mt_lifo_reclaimed); - } else - parent->mt_lifo_reclaimed = txn->mt_lifo_reclaimed; - txn->mt_lifo_reclaimed = NULL; - } - - /* Append our free list to parent's */ - rc = mdbx_pnl_append_list(&parent->mt_befree_pages, txn->mt_befree_pages); - if (unlikely(rc != MDBX_SUCCESS)) - goto fail; - mdbx_pnl_free(txn->mt_befree_pages); - /* Failures after this must either undo the changes - * to the parent or set MDBX_TXN_ERROR in the parent. */ - - parent->mt_next_pgno = txn->mt_next_pgno; - parent->mt_end_pgno = txn->mt_end_pgno; - parent->mt_flags = txn->mt_flags; - - /* Merge our cursors into parent's and close them */ - mdbx_cursors_eot(txn, 1); - - /* Update parent's DB table. */ - memcpy(parent->mt_dbs, txn->mt_dbs, txn->mt_numdbs * sizeof(MDBX_db)); - parent->mt_numdbs = txn->mt_numdbs; - parent->mt_dbflags[FREE_DBI] = txn->mt_dbflags[FREE_DBI]; - parent->mt_dbflags[MAIN_DBI] = txn->mt_dbflags[MAIN_DBI]; - for (i = CORE_DBS; i < txn->mt_numdbs; i++) { - /* preserve parent's DB_NEW status */ - parent->mt_dbflags[i] = - txn->mt_dbflags[i] | (parent->mt_dbflags[i] & DB_NEW); - } - - dst = parent->mt_rw_dirtylist; - src = txn->mt_rw_dirtylist; - /* Remove anything in our dirty list from parent's spill list */ - if ((pspill = parent->mt_spill_pages) && (ps_len = pspill[0])) { - x = y = ps_len; - pspill[0] = (pgno_t)-1; - /* Mark our dirty pages as deleted in parent spill list */ - for (i = 0, len = src[0].mid; ++i <= len;) { - pgno_t pn = src[i].mid << 1; - while (pn > pspill[x]) - x--; - if (pn == pspill[x]) { - pspill[x] = 1; - y = --x; - } - } - /* Squash deleted pagenums if we deleted any */ - for (x = y; ++x <= ps_len;) - if (!(pspill[x] & 1)) - pspill[++y] = pspill[x]; - pspill[0] = y; - } - - /* Remove anything in our spill list from parent's dirty list */ - if (txn->mt_spill_pages && txn->mt_spill_pages[0]) { - for (i = 1; i <= txn->mt_spill_pages[0]; i++) { - pgno_t pn = txn->mt_spill_pages[i]; - if (pn & 1) - continue; /* deleted spillpg */ - pn >>= 1; - y = mdbx_mid2l_search(dst, pn); - if (y <= dst[0].mid && dst[y].mid == pn) { - free(dst[y].mptr); - while (y < dst[0].mid) { - dst[y] = dst[y + 1]; - y++; - } - dst[0].mid--; - } - } - } - - /* Find len = length of merging our dirty list with parent's */ - x = dst[0].mid; - dst[0].mid = 0; /* simplify loops */ - if (parent->mt_parent) { - len = x + src[0].mid; - y = mdbx_mid2l_search(src, dst[x].mid + 1) - 1; - for (i = x; y && i; y--) { - pgno_t yp = src[y].mid; - while (yp < dst[i].mid) - i--; - if (yp == dst[i].mid) { - i--; - len--; - } - } - } else { /* Simplify the above for single-ancestor case */ - len = MDBX_PNL_UM_MAX - txn->mt_dirtyroom; - } - /* Merge our dirty list with parent's */ - y = src[0].mid; - for (i = len; y; dst[i--] = src[y--]) { - pgno_t yp = src[y].mid; - while (yp < dst[x].mid) - dst[i--] = dst[x--]; - if (yp == dst[x].mid) - free(dst[x--].mptr); - } - mdbx_tassert(txn, i == x); - dst[0].mid = len; - free(txn->mt_rw_dirtylist); - parent->mt_dirtyroom = txn->mt_dirtyroom; - if (txn->mt_spill_pages) { - if (parent->mt_spill_pages) { - /* TODO: Prevent failure here, so parent does not fail */ - rc = mdbx_pnl_append_list(&parent->mt_spill_pages, txn->mt_spill_pages); - if (unlikely(rc != MDBX_SUCCESS)) - parent->mt_flags |= MDBX_TXN_ERROR; - mdbx_pnl_free(txn->mt_spill_pages); - mdbx_pnl_sort(parent->mt_spill_pages); - } else { - parent->mt_spill_pages = txn->mt_spill_pages; - } - } - - /* Append our loose page list to parent's */ - for (lp = &parent->mt_loose_pages; *lp; lp = &NEXT_LOOSE_PAGE(*lp)) - ; - *lp = txn->mt_loose_pages; - parent->mt_loose_count += txn->mt_loose_count; - - parent->mt_child = NULL; - mdbx_pnl_free(((MDBX_ntxn *)txn)->mnt_pgstate.mf_reclaimed_pglist); - txn->mt_signature = 0; - free(txn); - return rc; - } - - if (unlikely(txn != env->me_txn)) { - mdbx_debug("attempt to commit unknown transaction"); - rc = MDBX_EINVAL; - goto fail; - } - - mdbx_cursors_eot(txn, 0); - end_mode |= MDBX_END_EOTDONE; - - if (!txn->mt_rw_dirtylist[0].mid && - !(txn->mt_flags & (MDBX_TXN_DIRTY | MDBX_TXN_SPILLS))) - goto done; - - mdbx_debug("committing txn %" PRIaTXN " %p on mdbenv %p, root page %" PRIaPGNO - "/%" PRIaPGNO, - txn->mt_txnid, (void *)txn, (void *)env, - txn->mt_dbs[MAIN_DBI].md_root, txn->mt_dbs[FREE_DBI].md_root); - - /* Update DB root pointers */ - if (txn->mt_numdbs > CORE_DBS) { - MDBX_cursor mc; - MDBX_dbi i; - MDBX_val data; - data.iov_len = sizeof(MDBX_db); - - mdbx_cursor_init(&mc, txn, MAIN_DBI, NULL); - for (i = CORE_DBS; i < txn->mt_numdbs; i++) { - if (txn->mt_dbflags[i] & DB_DIRTY) { - if (unlikely(TXN_DBI_CHANGED(txn, i))) { - rc = MDBX_BAD_DBI; - goto fail; - } - data.iov_base = &txn->mt_dbs[i]; - rc = mdbx_cursor_put(&mc, &txn->mt_dbxs[i].md_name, &data, F_SUBDATA); - if (unlikely(rc != MDBX_SUCCESS)) - goto fail; - } - } - } - - rc = mdbx_freelist_save(txn); - if (unlikely(rc != MDBX_SUCCESS)) - goto fail; - - mdbx_pnl_free(env->me_reclaimed_pglist); - env->me_reclaimed_pglist = NULL; - mdbx_pnl_shrink(&txn->mt_befree_pages); - - if (mdbx_audit_enabled()) - mdbx_audit(txn); - - rc = mdbx_page_flush(txn, 0); - if (likely(rc == MDBX_SUCCESS)) { - MDBX_meta meta, *head = mdbx_meta_head(env); - - meta.mm_magic_and_version = head->mm_magic_and_version; - meta.mm_extra_flags = head->mm_extra_flags; - meta.mm_validator_id = head->mm_validator_id; - meta.mm_extra_pagehdr = head->mm_extra_pagehdr; - - meta.mm_geo = head->mm_geo; - meta.mm_geo.next = txn->mt_next_pgno; - meta.mm_geo.now = txn->mt_end_pgno; - meta.mm_dbs[FREE_DBI] = txn->mt_dbs[FREE_DBI]; - meta.mm_dbs[MAIN_DBI] = txn->mt_dbs[MAIN_DBI]; - meta.mm_canary = txn->mt_canary; - mdbx_meta_set_txnid(env, &meta, txn->mt_txnid); - - rc = mdbx_sync_locked( - env, env->me_flags | txn->mt_flags | MDBX_SHRINK_ALLOWED, &meta); - } - if (unlikely(rc != MDBX_SUCCESS)) - goto fail; - env->me_lck->mti_readers_refresh_flag = false; - end_mode = MDBX_END_COMMITTED | MDBX_END_UPDATE | MDBX_END_EOTDONE; - -done: - return mdbx_txn_end(txn, end_mode); - -fail: - mdbx_txn_abort(txn); - return rc; -} - -/* Read the environment parameters of a DB environment - * before mapping it into memory. */ -static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta) { - assert(offsetof(MDBX_page, mp_meta) == PAGEHDRSZ); - memset(meta, 0, sizeof(MDBX_meta)); - meta->mm_datasync_sign = MDBX_DATASIGN_WEAK; - int rc = MDBX_CORRUPTED; - - /* Read twice all meta pages so we can find the latest one. */ - unsigned loop_limit = NUM_METAS * 2; - for (unsigned loop_count = 0; loop_count < loop_limit; ++loop_count) { - MDBX_page page; - - /* We don't know the page size on first time. - * So, just guess it. */ - unsigned guess_pagesize = meta->mm_psize; - if (guess_pagesize == 0) - guess_pagesize = - (loop_count > NUM_METAS) ? env->me_psize : env->me_os_psize; - - const unsigned meta_number = loop_count % NUM_METAS; - const unsigned offset = guess_pagesize * meta_number; - - unsigned retryleft = 42; - while (1) { - int err = mdbx_pread(env->me_fd, &page, sizeof(page), offset); - if (err != MDBX_SUCCESS) { - mdbx_error("read meta[%u,%u]: %i, %s", offset, (unsigned)sizeof(page), - err, mdbx_strerror(err)); - return err; - } - - MDBX_page again; - err = mdbx_pread(env->me_fd, &again, sizeof(again), offset); - if (err != MDBX_SUCCESS) { - mdbx_error("read meta[%u,%u]: %i, %s", offset, (unsigned)sizeof(again), - err, mdbx_strerror(err)); - return err; - } - - if (memcmp(&page, &again, sizeof(page)) == 0 || --retryleft == 0) - break; - - mdbx_info("meta[%u] was updated, re-read it", meta_number); - } - - if (!retryleft) { - mdbx_error("meta[%u] is too volatile, skip it", meta_number); - continue; - } - - if (page.mp_pgno != meta_number) { - mdbx_error("meta[%u] has invalid pageno %" PRIaPGNO, meta_number, - page.mp_pgno); - return MDBX_INVALID; - } - - if (!F_ISSET(page.mp_flags, P_META)) { - mdbx_error("page #%u not a meta-page", meta_number); - return MDBX_INVALID; - } - - if (page.mp_meta.mm_magic_and_version != MDBX_DATA_MAGIC) { - mdbx_error("meta[%u] has invalid magic/version MDBX_DEVEL=%d", - meta_number, MDBX_DEVEL); - return ((page.mp_meta.mm_magic_and_version >> 8) != MDBX_MAGIC) - ? MDBX_INVALID - : MDBX_VERSION_MISMATCH; - } - - if (page.mp_meta.mm_txnid_a != page.mp_meta.mm_txnid_b) { - mdbx_warning("meta[%u] not completely updated, skip it", meta_number); - continue; - } - - /* LY: check signature as a checksum */ - if (META_IS_STEADY(&page.mp_meta) && - page.mp_meta.mm_datasync_sign != mdbx_meta_sign(&page.mp_meta)) { - mdbx_notice("meta[%u] has invalid steady-checksum (0x%" PRIx64 - " != 0x%" PRIx64 "), skip it", - meta_number, page.mp_meta.mm_datasync_sign, - mdbx_meta_sign(&page.mp_meta)); - continue; - } - - /* LY: check pagesize */ - if (!mdbx_is_power2(page.mp_meta.mm_psize) || - page.mp_meta.mm_psize < MIN_PAGESIZE || - page.mp_meta.mm_psize > MAX_PAGESIZE) { - mdbx_notice("meta[%u] has invalid pagesize (%u), skip it", meta_number, - page.mp_meta.mm_psize); - rc = MDBX_VERSION_MISMATCH; - continue; - } - - mdbx_debug("read meta%" PRIaPGNO " = root %" PRIaPGNO "/%" PRIaPGNO - ", geo %" PRIaPGNO "/%" PRIaPGNO "-%" PRIaPGNO "/%" PRIaPGNO - " +%u -%u, txn_id %" PRIaTXN ", %s", - page.mp_pgno, page.mp_meta.mm_dbs[MAIN_DBI].md_root, - page.mp_meta.mm_dbs[FREE_DBI].md_root, page.mp_meta.mm_geo.lower, - page.mp_meta.mm_geo.next, page.mp_meta.mm_geo.now, - page.mp_meta.mm_geo.upper, page.mp_meta.mm_geo.grow, - page.mp_meta.mm_geo.shrink, page.mp_meta.mm_txnid_a, - mdbx_durable_str(&page.mp_meta)); - - /* LY: check min-pages value */ - if (page.mp_meta.mm_geo.lower < MIN_PAGENO || - page.mp_meta.mm_geo.lower > MAX_PAGENO) { - mdbx_notice("meta[%u] has invalid min-pages (%" PRIaPGNO "), skip it", - meta_number, page.mp_meta.mm_geo.lower); - rc = MDBX_INVALID; - continue; - } - - /* LY: check max-pages value */ - if (page.mp_meta.mm_geo.upper < MIN_PAGENO || - page.mp_meta.mm_geo.upper > MAX_PAGENO || - page.mp_meta.mm_geo.upper < page.mp_meta.mm_geo.lower) { - mdbx_notice("meta[%u] has invalid max-pages (%" PRIaPGNO "), skip it", - meta_number, page.mp_meta.mm_geo.upper); - rc = MDBX_INVALID; - continue; - } - - /* LY: check mapsize limits */ - const uint64_t mapsize_min = - page.mp_meta.mm_geo.lower * (uint64_t)page.mp_meta.mm_psize; - const uint64_t mapsize_max = - page.mp_meta.mm_geo.upper * (uint64_t)page.mp_meta.mm_psize; - STATIC_ASSERT(MAX_MAPSIZE < SSIZE_MAX - MAX_PAGESIZE); - STATIC_ASSERT(MIN_MAPSIZE < MAX_MAPSIZE); - if (mapsize_min < MIN_MAPSIZE || mapsize_max > MAX_MAPSIZE) { - mdbx_notice("meta[%u] has invalid min-mapsize (%" PRIu64 "), skip it", - meta_number, mapsize_min); - rc = MDBX_VERSION_MISMATCH; - continue; - } - - STATIC_ASSERT(MIN_MAPSIZE < MAX_MAPSIZE); - if (mapsize_max > MAX_MAPSIZE || - MAX_PAGENO < mdbx_roundup2((size_t)mapsize_max, env->me_os_psize) / - (uint64_t)page.mp_meta.mm_psize) { - mdbx_notice("meta[%u] has too large max-mapsize (%" PRIu64 "), skip it", - meta_number, mapsize_max); - rc = MDBX_TOO_LARGE; - continue; - } - - /* LY: check end_pgno */ - if (page.mp_meta.mm_geo.now < page.mp_meta.mm_geo.lower || - page.mp_meta.mm_geo.now > page.mp_meta.mm_geo.upper) { - mdbx_notice("meta[%u] has invalid end-pageno (%" PRIaPGNO "), skip it", - meta_number, page.mp_meta.mm_geo.now); - rc = MDBX_CORRUPTED; - continue; - } - - /* LY: check last_pgno */ - if (page.mp_meta.mm_geo.next < MIN_PAGENO || - page.mp_meta.mm_geo.next - 1 > MAX_PAGENO) { - mdbx_notice("meta[%u] has invalid next-pageno (%" PRIaPGNO "), skip it", - meta_number, page.mp_meta.mm_geo.next); - rc = MDBX_CORRUPTED; - continue; - } - - if (page.mp_meta.mm_geo.next > page.mp_meta.mm_geo.now) { - mdbx_notice("meta[%u] next-pageno (%" PRIaPGNO - ") is beyond end-pgno (%" PRIaPGNO "), skip it", - meta_number, page.mp_meta.mm_geo.next, - page.mp_meta.mm_geo.now); - rc = MDBX_CORRUPTED; - continue; - } - - /* LY: FreeDB root */ - if (page.mp_meta.mm_dbs[FREE_DBI].md_root == P_INVALID) { - if (page.mp_meta.mm_dbs[FREE_DBI].md_branch_pages || - page.mp_meta.mm_dbs[FREE_DBI].md_depth || - page.mp_meta.mm_dbs[FREE_DBI].md_entries || - page.mp_meta.mm_dbs[FREE_DBI].md_leaf_pages || - page.mp_meta.mm_dbs[FREE_DBI].md_overflow_pages) { - mdbx_notice("meta[%u] has false-empty freedb, skip it", meta_number); - rc = MDBX_CORRUPTED; - continue; - } - } else if (page.mp_meta.mm_dbs[FREE_DBI].md_root >= - page.mp_meta.mm_geo.next) { - mdbx_notice("meta[%u] has invalid freedb-root %" PRIaPGNO ", skip it", - meta_number, page.mp_meta.mm_dbs[FREE_DBI].md_root); - rc = MDBX_CORRUPTED; - continue; - } - - /* LY: MainDB root */ - if (page.mp_meta.mm_dbs[MAIN_DBI].md_root == P_INVALID) { - if (page.mp_meta.mm_dbs[MAIN_DBI].md_branch_pages || - page.mp_meta.mm_dbs[MAIN_DBI].md_depth || - page.mp_meta.mm_dbs[MAIN_DBI].md_entries || - page.mp_meta.mm_dbs[MAIN_DBI].md_leaf_pages || - page.mp_meta.mm_dbs[MAIN_DBI].md_overflow_pages) { - mdbx_notice("meta[%u] has false-empty maindb", meta_number); - rc = MDBX_CORRUPTED; - continue; - } - } else if (page.mp_meta.mm_dbs[MAIN_DBI].md_root >= - page.mp_meta.mm_geo.next) { - mdbx_notice("meta[%u] has invalid maindb-root %" PRIaPGNO ", skip it", - meta_number, page.mp_meta.mm_dbs[MAIN_DBI].md_root); - rc = MDBX_CORRUPTED; - continue; - } - - if (page.mp_meta.mm_txnid_a == 0) { - mdbx_warning("meta[%u] has zero txnid, skip it", meta_number); - continue; - } - - if (mdbx_meta_ot(prefer_noweak, env, meta, &page.mp_meta)) { - *meta = page.mp_meta; - if (META_IS_WEAK(meta)) - loop_limit += 1; /* LY: should re-read to hush race with update */ - mdbx_info("latch meta[%u]", meta_number); - } - } - - if (META_IS_WEAK(meta)) { - mdbx_error("no usable meta-pages, database is corrupted"); - return rc; - } - - return MDBX_SUCCESS; -} - -static MDBX_page *__cold mdbx_meta_model(const MDBX_env *env, MDBX_page *model, - unsigned num) { - - mdbx_ensure(env, mdbx_is_power2(env->me_psize)); - mdbx_ensure(env, env->me_psize >= MIN_PAGESIZE); - mdbx_ensure(env, env->me_psize <= MAX_PAGESIZE); - mdbx_ensure(env, env->me_dbgeo.lower >= MIN_MAPSIZE); - mdbx_ensure(env, env->me_dbgeo.upper <= MAX_MAPSIZE); - mdbx_ensure(env, env->me_dbgeo.now >= env->me_dbgeo.lower); - mdbx_ensure(env, env->me_dbgeo.now <= env->me_dbgeo.upper); - - memset(model, 0, sizeof(*model)); - model->mp_pgno = num; - model->mp_flags = P_META; - model->mp_meta.mm_magic_and_version = MDBX_DATA_MAGIC; - - model->mp_meta.mm_geo.lower = bytes2pgno(env, env->me_dbgeo.lower); - model->mp_meta.mm_geo.upper = bytes2pgno(env, env->me_dbgeo.upper); - model->mp_meta.mm_geo.grow = (uint16_t)bytes2pgno(env, env->me_dbgeo.grow); - model->mp_meta.mm_geo.shrink = - (uint16_t)bytes2pgno(env, env->me_dbgeo.shrink); - model->mp_meta.mm_geo.now = bytes2pgno(env, env->me_dbgeo.now); - model->mp_meta.mm_geo.next = NUM_METAS; - - mdbx_ensure(env, model->mp_meta.mm_geo.lower >= MIN_PAGENO); - mdbx_ensure(env, model->mp_meta.mm_geo.upper <= MAX_PAGENO); - mdbx_ensure(env, model->mp_meta.mm_geo.now >= model->mp_meta.mm_geo.lower); - mdbx_ensure(env, model->mp_meta.mm_geo.now <= model->mp_meta.mm_geo.upper); - mdbx_ensure(env, model->mp_meta.mm_geo.next >= MIN_PAGENO); - mdbx_ensure(env, model->mp_meta.mm_geo.next <= model->mp_meta.mm_geo.now); - mdbx_ensure(env, model->mp_meta.mm_geo.grow == - bytes2pgno(env, env->me_dbgeo.grow)); - mdbx_ensure(env, model->mp_meta.mm_geo.shrink == - bytes2pgno(env, env->me_dbgeo.shrink)); - - model->mp_meta.mm_psize = env->me_psize; - model->mp_meta.mm_flags = (uint16_t)env->me_flags; - model->mp_meta.mm_flags |= - MDBX_INTEGERKEY; /* this is mm_dbs[FREE_DBI].md_flags */ - model->mp_meta.mm_dbs[FREE_DBI].md_root = P_INVALID; - model->mp_meta.mm_dbs[MAIN_DBI].md_root = P_INVALID; - mdbx_meta_set_txnid(env, &model->mp_meta, MIN_TXNID + num); - model->mp_meta.mm_datasync_sign = mdbx_meta_sign(&model->mp_meta); - return (MDBX_page *)((uint8_t *)model + env->me_psize); -} - -/* Fill in most of the zeroed meta-pages for an empty database environment. - * Return pointer to recenly (head) meta-page. */ -static MDBX_page *__cold mdbx_init_metas(const MDBX_env *env, void *buffer) { - MDBX_page *page0 = (MDBX_page *)buffer; - MDBX_page *page1 = mdbx_meta_model(env, page0, 0); - MDBX_page *page2 = mdbx_meta_model(env, page1, 1); - mdbx_meta_model(env, page2, 2); - page2->mp_meta.mm_datasync_sign = MDBX_DATASIGN_WEAK; - mdbx_assert(env, !mdbx_meta_eq(env, &page0->mp_meta, &page1->mp_meta)); - mdbx_assert(env, !mdbx_meta_eq(env, &page1->mp_meta, &page2->mp_meta)); - mdbx_assert(env, !mdbx_meta_eq(env, &page2->mp_meta, &page0->mp_meta)); - return page1; -} - -static int mdbx_sync_locked(MDBX_env *env, unsigned flags, - MDBX_meta *const pending) { - mdbx_assert(env, ((env->me_flags ^ flags) & MDBX_WRITEMAP) == 0); - MDBX_meta *const meta0 = METAPAGE(env, 0); - MDBX_meta *const meta1 = METAPAGE(env, 1); - MDBX_meta *const meta2 = METAPAGE(env, 2); - MDBX_meta *const head = mdbx_meta_head(env); - - mdbx_assert(env, mdbx_meta_eq_mask(env) == 0); - mdbx_assert(env, - pending < METAPAGE(env, 0) || pending > METAPAGE(env, NUM_METAS)); - mdbx_assert(env, (env->me_flags & (MDBX_RDONLY | MDBX_FATAL_ERROR)) == 0); - mdbx_assert(env, !META_IS_STEADY(head) || env->me_sync_pending != 0); - mdbx_assert(env, pending->mm_geo.next <= pending->mm_geo.now); - - const size_t usedbytes = pgno_align2os_bytes(env, pending->mm_geo.next); - if (env->me_sync_threshold && env->me_sync_pending >= env->me_sync_threshold) - flags &= MDBX_WRITEMAP | MDBX_SHRINK_ALLOWED; - - /* LY: step#1 - sync previously written/updated data-pages */ - int rc = MDBX_RESULT_TRUE; - if (env->me_sync_pending && (flags & MDBX_NOSYNC) == 0) { - mdbx_assert(env, ((flags ^ env->me_flags) & MDBX_WRITEMAP) == 0); - MDBX_meta *const steady = mdbx_meta_steady(env); - if (flags & MDBX_WRITEMAP) { - rc = mdbx_msync(&env->me_dxb_mmap, 0, usedbytes, flags & MDBX_MAPASYNC); - if (unlikely(rc != MDBX_SUCCESS)) - goto fail; - if ((flags & MDBX_MAPASYNC) == 0) { - if (unlikely(pending->mm_geo.next > steady->mm_geo.now)) { - rc = mdbx_filesize_sync(env->me_fd); - if (unlikely(rc != MDBX_SUCCESS)) - goto fail; - } - env->me_sync_pending = 0; - } - } else { - rc = mdbx_filesync(env->me_fd, pending->mm_geo.next > steady->mm_geo.now); - if (unlikely(rc != MDBX_SUCCESS)) - goto fail; - env->me_sync_pending = 0; - } - } - -#if defined(_WIN32) || defined(_WIN64) -/* Windows is unable shrinking a mapped file */ -#else - /* LY: check conditions to shrink datafile */ - pgno_t shrink = 0; - if ((flags & MDBX_SHRINK_ALLOWED) && pending->mm_geo.shrink && - pending->mm_geo.now - pending->mm_geo.next > pending->mm_geo.shrink) { - const pgno_t aligner = - pending->mm_geo.grow ? pending->mm_geo.grow : pending->mm_geo.shrink; - const pgno_t aligned = pgno_align2os_pgno( - env, pending->mm_geo.next + aligner - pending->mm_geo.next % aligner); - const pgno_t bottom = - (aligned > pending->mm_geo.lower) ? aligned : pending->mm_geo.lower; - if (pending->mm_geo.now > bottom) { - shrink = pending->mm_geo.now - bottom; - pending->mm_geo.now = bottom; - if (mdbx_meta_txnid_stable(env, head) == pending->mm_txnid_a) - mdbx_meta_set_txnid(env, pending, pending->mm_txnid_a + 1); - } - } -#endif /* not a Windows */ - - /* Steady or Weak */ - if (env->me_sync_pending == 0) { - pending->mm_datasync_sign = mdbx_meta_sign(pending); - } else { - pending->mm_datasync_sign = - (flags & MDBX_UTTERLY_NOSYNC) == MDBX_UTTERLY_NOSYNC - ? MDBX_DATASIGN_NONE - : MDBX_DATASIGN_WEAK; - } - - MDBX_meta *target = nullptr; - if (mdbx_meta_txnid_stable(env, head) == pending->mm_txnid_a) { - mdbx_assert(env, memcmp(&head->mm_dbs, &pending->mm_dbs, - sizeof(head->mm_dbs)) == 0); - mdbx_assert(env, memcmp(&head->mm_canary, &pending->mm_canary, - sizeof(head->mm_canary)) == 0); - mdbx_assert(env, memcmp(&head->mm_geo, &pending->mm_geo, - sizeof(pending->mm_geo)) == 0); - if (!META_IS_STEADY(head) && META_IS_STEADY(pending)) - target = head; - else { - mdbx_ensure(env, mdbx_meta_eq(env, head, pending)); - mdbx_debug("skip update meta"); - return MDBX_SUCCESS; - } - } else if (head == meta0) - target = mdbx_meta_ancient(prefer_steady, env, meta1, meta2); - else if (head == meta1) - target = mdbx_meta_ancient(prefer_steady, env, meta0, meta2); - else { - mdbx_assert(env, head == meta2); - target = mdbx_meta_ancient(prefer_steady, env, meta0, meta1); - } - - /* LY: step#2 - update meta-page. */ - mdbx_debug("writing meta%" PRIaPGNO " = root %" PRIaPGNO "/%" PRIaPGNO - ", geo %" PRIaPGNO "/%" PRIaPGNO "-%" PRIaPGNO "/%" PRIaPGNO - " +%u -%u, txn_id %" PRIaTXN ", %s", - container_of(target, MDBX_page, mp_data)->mp_pgno, - pending->mm_dbs[MAIN_DBI].md_root, - pending->mm_dbs[FREE_DBI].md_root, pending->mm_geo.lower, - pending->mm_geo.next, pending->mm_geo.now, pending->mm_geo.upper, - pending->mm_geo.grow, pending->mm_geo.shrink, pending->mm_txnid_a, - mdbx_durable_str(pending)); - - mdbx_debug("meta0: %s, %s, txn_id %" PRIaTXN ", root %" PRIaPGNO - "/%" PRIaPGNO, - (meta0 == head) ? "head" : (meta0 == target) ? "tail" : "stay", - mdbx_durable_str(meta0), mdbx_meta_txnid_fluid(env, meta0), - meta0->mm_dbs[MAIN_DBI].md_root, meta0->mm_dbs[FREE_DBI].md_root); - mdbx_debug("meta1: %s, %s, txn_id %" PRIaTXN ", root %" PRIaPGNO - "/%" PRIaPGNO, - (meta1 == head) ? "head" : (meta1 == target) ? "tail" : "stay", - mdbx_durable_str(meta1), mdbx_meta_txnid_fluid(env, meta1), - meta1->mm_dbs[MAIN_DBI].md_root, meta1->mm_dbs[FREE_DBI].md_root); - mdbx_debug("meta2: %s, %s, txn_id %" PRIaTXN ", root %" PRIaPGNO - "/%" PRIaPGNO, - (meta2 == head) ? "head" : (meta2 == target) ? "tail" : "stay", - mdbx_durable_str(meta2), mdbx_meta_txnid_fluid(env, meta2), - meta2->mm_dbs[MAIN_DBI].md_root, meta2->mm_dbs[FREE_DBI].md_root); - - mdbx_assert(env, !mdbx_meta_eq(env, pending, meta0)); - mdbx_assert(env, !mdbx_meta_eq(env, pending, meta1)); - mdbx_assert(env, !mdbx_meta_eq(env, pending, meta2)); - - mdbx_assert(env, ((env->me_flags ^ flags) & MDBX_WRITEMAP) == 0); - mdbx_ensure(env, - target == head || - mdbx_meta_txnid_stable(env, target) < pending->mm_txnid_a); - if (env->me_flags & MDBX_WRITEMAP) { - mdbx_jitter4testing(true); - if (likely(target != head)) { - /* LY: 'invalidate' the meta. */ - target->mm_datasync_sign = MDBX_DATASIGN_WEAK; - mdbx_meta_update_begin(env, target, pending->mm_txnid_a); -#ifndef NDEBUG - /* debug: provoke failure to catch a violators */ - memset(target->mm_dbs, 0xCC, - sizeof(target->mm_dbs) + sizeof(target->mm_canary)); - mdbx_jitter4testing(false); -#endif - - /* LY: update info */ - target->mm_geo = pending->mm_geo; - target->mm_dbs[FREE_DBI] = pending->mm_dbs[FREE_DBI]; - target->mm_dbs[MAIN_DBI] = pending->mm_dbs[MAIN_DBI]; - target->mm_canary = pending->mm_canary; - mdbx_jitter4testing(true); - mdbx_coherent_barrier(); - - /* LY: 'commit' the meta */ - mdbx_meta_update_end(env, target, pending->mm_txnid_b); - mdbx_jitter4testing(true); - } else { - /* dangerous case (target == head), only mm_datasync_sign could - * me updated, check assertions once again */ - mdbx_ensure(env, - mdbx_meta_txnid_stable(env, head) == pending->mm_txnid_a && - !META_IS_STEADY(head) && META_IS_STEADY(pending)); - mdbx_ensure(env, memcmp(&head->mm_geo, &pending->mm_geo, - sizeof(head->mm_geo)) == 0); - mdbx_ensure(env, memcmp(&head->mm_dbs, &pending->mm_dbs, - sizeof(head->mm_dbs)) == 0); - mdbx_ensure(env, memcmp(&head->mm_canary, &pending->mm_canary, - sizeof(head->mm_canary)) == 0); - } - target->mm_datasync_sign = pending->mm_datasync_sign; - mdbx_coherent_barrier(); - mdbx_jitter4testing(true); - } else { - rc = mdbx_pwrite(env->me_fd, pending, sizeof(MDBX_meta), - (uint8_t *)target - env->me_map); - if (unlikely(rc != MDBX_SUCCESS)) { - undo: - mdbx_debug("write failed, disk error?"); - /* On a failure, the pagecache still contains the new data. - * Try write some old data back, to prevent it from being used. */ - mdbx_pwrite(env->me_fd, (void *)target, sizeof(MDBX_meta), - (uint8_t *)target - env->me_map); - goto fail; - } - mdbx_invalidate_cache(target, sizeof(MDBX_meta)); - } - - /* LY: step#3 - sync meta-pages. */ - mdbx_assert(env, ((env->me_flags ^ flags) & MDBX_WRITEMAP) == 0); - if ((flags & (MDBX_NOSYNC | MDBX_NOMETASYNC)) == 0) { - mdbx_assert(env, ((flags ^ env->me_flags) & MDBX_WRITEMAP) == 0); - if (flags & MDBX_WRITEMAP) { - const size_t offset = - ((uint8_t *)container_of(head, MDBX_page, mp_meta)) - - env->me_dxb_mmap.dxb; - const size_t paged_offset = offset & ~(env->me_os_psize - 1); - const size_t paged_length = mdbx_roundup2( - env->me_psize + offset - paged_offset, env->me_os_psize); - rc = mdbx_msync(&env->me_dxb_mmap, paged_offset, paged_length, - flags & MDBX_MAPASYNC); - if (unlikely(rc != MDBX_SUCCESS)) - goto fail; - } else { - rc = mdbx_filesync(env->me_fd, false); - if (rc != MDBX_SUCCESS) - goto undo; - } - } - -#if defined(_WIN32) || defined(_WIN64) -/* Windows is unable shrinking a mapped file */ -#else - /* LY: shrink datafile if needed */ - if (unlikely(shrink)) { - mdbx_info("shrink to %" PRIaPGNO " pages (-%" PRIaPGNO ")", - pending->mm_geo.now, shrink); - rc = mdbx_mapresize(env, pending->mm_geo.now, pending->mm_geo.upper); - if (MDBX_IS_ERROR(rc)) - goto fail; - } -#endif /* not a Windows */ - - return MDBX_SUCCESS; - -fail: - env->me_flags |= MDBX_FATAL_ERROR; - return rc; -} - -int __cold mdbx_env_get_maxkeysize(MDBX_env *env) { - if (!env || env->me_signature != MDBX_ME_SIGNATURE || !env->me_maxkey_limit) - return -MDBX_EINVAL; - return env->me_maxkey_limit; -} - -#define mdbx_nodemax(pagesize) \ - (((((pagesize)-PAGEHDRSZ) / MDBX_MINKEYS) & -(intptr_t)2) - sizeof(indx_t)) - -#define mdbx_maxkey(nodemax) ((nodemax) - (NODESIZE + sizeof(MDBX_db))) - -#define mdbx_maxfree1pg(pagesize) (((pagesize)-PAGEHDRSZ) / sizeof(pgno_t) - 1) - -int mdbx_get_maxkeysize(size_t pagesize) { - if (pagesize == 0) - pagesize = mdbx_syspagesize(); - - intptr_t nodemax = mdbx_nodemax(pagesize); - if (nodemax < 0) - return -MDBX_EINVAL; - - intptr_t maxkey = mdbx_maxkey(nodemax); - return (maxkey > 0 && maxkey < INT_MAX) ? (int)maxkey : -MDBX_EINVAL; -} - -static void __cold mdbx_setup_pagesize(MDBX_env *env, const size_t pagesize) { - STATIC_ASSERT(SSIZE_MAX > MAX_MAPSIZE); - STATIC_ASSERT(MIN_PAGESIZE > sizeof(MDBX_page)); - mdbx_ensure(env, mdbx_is_power2(pagesize)); - mdbx_ensure(env, pagesize >= MIN_PAGESIZE); - mdbx_ensure(env, pagesize <= MAX_PAGESIZE); - env->me_psize = (unsigned)pagesize; - - STATIC_ASSERT(mdbx_maxfree1pg(MIN_PAGESIZE) > 42); - STATIC_ASSERT(mdbx_maxfree1pg(MAX_PAGESIZE) < MDBX_PNL_DB_MAX); - const intptr_t maxfree_1pg = (pagesize - PAGEHDRSZ) / sizeof(pgno_t) - 1; - mdbx_ensure(env, maxfree_1pg > 42 && maxfree_1pg < MDBX_PNL_DB_MAX); - env->me_maxfree_1pg = (unsigned)maxfree_1pg; - - STATIC_ASSERT(mdbx_nodemax(MIN_PAGESIZE) > 42); - STATIC_ASSERT(mdbx_nodemax(MAX_PAGESIZE) < UINT16_MAX); - const intptr_t nodemax = mdbx_nodemax(pagesize); - mdbx_ensure(env, nodemax > 42 && nodemax < UINT16_MAX); - env->me_nodemax = (unsigned)nodemax; - - STATIC_ASSERT(mdbx_maxkey(MIN_PAGESIZE) > 42); - STATIC_ASSERT(mdbx_maxkey(MIN_PAGESIZE) < MIN_PAGESIZE); - STATIC_ASSERT(mdbx_maxkey(MAX_PAGESIZE) > 42); - STATIC_ASSERT(mdbx_maxkey(MAX_PAGESIZE) < MAX_PAGESIZE); - const intptr_t maxkey_limit = mdbx_maxkey(env->me_nodemax); - mdbx_ensure(env, maxkey_limit > 42 && (size_t)maxkey_limit < pagesize); - env->me_maxkey_limit = (unsigned)maxkey_limit; - - env->me_psize2log = mdbx_log2(pagesize); - mdbx_assert(env, pgno2bytes(env, 1) == pagesize); - mdbx_assert(env, bytes2pgno(env, pagesize + pagesize) == 2); -} - -int __cold mdbx_env_create(MDBX_env **penv) { - MDBX_env *env = calloc(1, sizeof(MDBX_env)); - if (!env) - return MDBX_ENOMEM; - - env->me_maxreaders = DEFAULT_READERS; - env->me_maxdbs = env->me_numdbs = CORE_DBS; - env->me_fd = INVALID_HANDLE_VALUE; - env->me_lfd = INVALID_HANDLE_VALUE; - env->me_pid = mdbx_getpid(); - - int rc; - const size_t os_psize = mdbx_syspagesize(); - if (!mdbx_is_power2(os_psize) || os_psize < MIN_PAGESIZE) { - mdbx_error("unsuitable system pagesize %" PRIuPTR, os_psize); - rc = MDBX_INCOMPATIBLE; - goto bailout; - } - env->me_os_psize = (unsigned)os_psize; - mdbx_setup_pagesize(env, env->me_os_psize); - - rc = mdbx_fastmutex_init(&env->me_dbi_lock); - if (unlikely(rc != MDBX_SUCCESS)) - goto bailout; - - VALGRIND_CREATE_MEMPOOL(env, 0, 0); - env->me_signature = MDBX_ME_SIGNATURE; - *penv = env; - return MDBX_SUCCESS; - -bailout: - free(env); - *penv = nullptr; - return rc; -} - -static int __cold mdbx_env_map(MDBX_env *env, size_t usedsize) { - int rc = mdbx_mmap(env->me_flags, &env->me_dxb_mmap, env->me_dbgeo.now, - env->me_dbgeo.upper); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - -#ifdef MADV_DONTFORK - if (madvise(env->me_map, env->me_mapsize, MADV_DONTFORK)) - return errno; -#endif - -#ifdef MADV_NOHUGEPAGE - (void)madvise(env->me_map, env->me_mapsize, MADV_NOHUGEPAGE); -#endif - -#if defined(MADV_DODUMP) && defined(MADV_DONTDUMP) - const size_t meta_length = pgno2bytes(env, NUM_METAS); - (void)madvise(env->me_map, meta_length, MADV_DODUMP); - if (!(env->me_flags & MDBX_PAGEPERTURB)) - (void)madvise(env->me_map + meta_length, env->me_mapsize - meta_length, - MADV_DONTDUMP); -#endif - -#ifdef MADV_REMOVE - if (usedsize && (env->me_flags & MDBX_WRITEMAP)) { - (void)madvise(env->me_map + usedsize, env->me_mapsize - usedsize, - MADV_REMOVE); - } -#else - (void)usedsize; -#endif - -#if defined(MADV_RANDOM) && defined(MADV_WILLNEED) - /* Turn on/off readahead. It's harmful when the DB is larger than RAM. */ - if (madvise(env->me_map, env->me_mapsize, - (env->me_flags & MDBX_NORDAHEAD) ? MADV_RANDOM : MADV_WILLNEED)) - return errno; -#endif - -#ifdef USE_VALGRIND - env->me_valgrind_handle = - VALGRIND_CREATE_BLOCK(env->me_map, env->me_mapsize, "mdbx"); -#endif - - return MDBX_SUCCESS; -} - -LIBMDBX_API int mdbx_env_set_geometry(MDBX_env *env, intptr_t size_lower, - intptr_t size_now, intptr_t size_upper, - intptr_t growth_step, - intptr_t shrink_threshold, - intptr_t pagesize) { - if (unlikely(!env)) - return MDBX_EINVAL; - - if (unlikely(env->me_signature != MDBX_ME_SIGNATURE)) - return MDBX_EBADSIGN; - - const bool outside_txn = - (!env->me_txn0 || env->me_txn0->mt_owner != mdbx_thread_self()); - -#if MDBX_DEBUG - if (growth_step < 0) - growth_step = 1; - if (shrink_threshold < 0) - shrink_threshold = 1; -#endif - - int rc = MDBX_PROBLEM; - if (env->me_map) { - /* env already mapped */ - if (!env->me_lck || (env->me_flags & MDBX_RDONLY)) - return MDBX_EACCESS; - - if (outside_txn) { - int err = mdbx_txn_lock(env, false); - if (unlikely(err != MDBX_SUCCESS)) - return err; - } - MDBX_meta *head = mdbx_meta_head(env); - - if (pagesize < 0) - pagesize = env->me_psize; - if (pagesize != (intptr_t)env->me_psize) { - rc = MDBX_EINVAL; - goto bailout; - } - - if (size_lower < 0) - size_lower = pgno2bytes(env, head->mm_geo.lower); - if (size_now < 0) - size_now = pgno2bytes(env, head->mm_geo.now); - if (size_upper < 0) - size_upper = pgno2bytes(env, head->mm_geo.upper); - if (growth_step < 0) - growth_step = pgno2bytes(env, head->mm_geo.grow); - if (shrink_threshold < 0) - shrink_threshold = pgno2bytes(env, head->mm_geo.shrink); - - const size_t usedbytes = pgno2bytes(env, head->mm_geo.next); - if ((size_t)size_upper < usedbytes) { - rc = MDBX_MAP_FULL; - goto bailout; - } - if ((size_t)size_now < usedbytes) - size_now = usedbytes; -#if defined(_WIN32) || defined(_WIN64) - if ((size_t)size_now < env->me_dbgeo.now || - (size_t)size_upper < env->me_dbgeo.upper) { - /* Windows is unable shrinking a mapped file */ - return ERROR_USER_MAPPED_FILE; - } -#endif /* Windows */ - } else { - /* env NOT yet mapped */ - if (!outside_txn) { - rc = MDBX_PANIC; - goto bailout; - } - - if (pagesize < 0) { - pagesize = env->me_os_psize; - if (pagesize > MAX_PAGESIZE) - pagesize = MAX_PAGESIZE; - mdbx_assert(env, pagesize >= MIN_PAGESIZE); - } - } - - if (pagesize < MIN_PAGESIZE || pagesize > MAX_PAGESIZE || - !mdbx_is_power2(pagesize)) { - rc = MDBX_EINVAL; - goto bailout; - } - - if (size_lower < 0) { - size_lower = MIN_MAPSIZE; - if (MIN_MAPSIZE / pagesize < MIN_PAGENO) - size_lower = MIN_PAGENO * pagesize; - } - - if (size_now < 0) { - size_now = DEFAULT_MAPSIZE; - if (size_now < size_lower) - size_now = size_lower; - } - - if (size_upper < 0) { - if ((size_t)size_now >= MAX_MAPSIZE / 2) - size_upper = MAX_MAPSIZE; - else if (MAX_MAPSIZE != MAX_MAPSIZE32 && - (size_t)size_now >= MAX_MAPSIZE32 / 2 && - (size_t)size_now <= MAX_MAPSIZE32 / 4 * 3) - size_upper = MAX_MAPSIZE32; - else { - size_upper = size_now + size_now; - if ((size_t)size_upper < DEFAULT_MAPSIZE * 2) - size_upper = DEFAULT_MAPSIZE * 2; - } - if ((size_t)size_upper / pagesize > MAX_PAGENO) - size_upper = pagesize * MAX_PAGENO; - } - - if (unlikely(size_lower < MIN_MAPSIZE || size_lower > size_upper)) { - rc = MDBX_EINVAL; - goto bailout; - } - - if ((uint64_t)size_lower / pagesize < MIN_PAGENO) { - rc = MDBX_EINVAL; - goto bailout; - } - - if (unlikely((size_t)size_upper > MAX_MAPSIZE || - (uint64_t)size_upper / pagesize > MAX_PAGENO)) { - rc = MDBX_TOO_LARGE; - goto bailout; - } - - size_lower = mdbx_roundup2(size_lower, env->me_os_psize); - size_upper = mdbx_roundup2(size_upper, env->me_os_psize); - size_now = mdbx_roundup2(size_now, env->me_os_psize); - - /* LY: подбираем значение size_upper: - * - кратное размеру системной страницы - * - без нарушения MAX_MAPSIZE или MAX_PAGENO */ - while (unlikely((size_t)size_upper > MAX_MAPSIZE || - (uint64_t)size_upper / pagesize > MAX_PAGENO)) { - if ((size_t)size_upper < env->me_os_psize + MIN_MAPSIZE || - (size_t)size_upper < env->me_os_psize * (MIN_PAGENO + 1)) { - /* паранойа на случай переполнения при невероятных значениях */ - rc = MDBX_EINVAL; - goto bailout; - } - size_upper -= env->me_os_psize; - if ((size_t)size_upper > (size_t)size_lower) - size_lower = size_upper; - } - mdbx_assert(env, (size_upper - size_lower) % env->me_os_psize == 0); - - if (size_now < size_lower) - size_now = size_lower; - if (size_now > size_upper) - size_now = size_upper; - - if (growth_step < 0) { - growth_step = ((size_t)(size_upper - size_lower)) / 42; - if (growth_step > size_lower) - growth_step = size_lower; - if (growth_step < 65536) - growth_step = 65536; - if ((size_t)growth_step > MEGABYTE * 16) - growth_step = MEGABYTE * 16; - } - growth_step = mdbx_roundup2(growth_step, env->me_os_psize); - if (bytes2pgno(env, growth_step) > UINT16_MAX) - growth_step = pgno2bytes(env, UINT16_MAX); - - if (shrink_threshold < 0) { - shrink_threshold = growth_step + growth_step; - if (shrink_threshold < growth_step) - shrink_threshold = growth_step; - } - shrink_threshold = mdbx_roundup2(shrink_threshold, env->me_os_psize); - if (bytes2pgno(env, shrink_threshold) > UINT16_MAX) - shrink_threshold = pgno2bytes(env, UINT16_MAX); - - /* save user's geo-params for future open/create */ - env->me_dbgeo.lower = size_lower; - env->me_dbgeo.now = size_now; - env->me_dbgeo.upper = size_upper; - env->me_dbgeo.grow = growth_step; - env->me_dbgeo.shrink = shrink_threshold; - rc = MDBX_SUCCESS; - - if (env->me_map) { - /* apply new params */ - mdbx_assert(env, pagesize == (intptr_t)env->me_psize); - - MDBX_meta *head = mdbx_meta_head(env); - MDBX_meta meta = *head; - meta.mm_geo.lower = bytes2pgno(env, env->me_dbgeo.lower); - meta.mm_geo.now = bytes2pgno(env, env->me_dbgeo.now); - meta.mm_geo.upper = bytes2pgno(env, env->me_dbgeo.upper); - meta.mm_geo.grow = (uint16_t)bytes2pgno(env, env->me_dbgeo.grow); - meta.mm_geo.shrink = (uint16_t)bytes2pgno(env, env->me_dbgeo.shrink); - - mdbx_assert(env, env->me_dbgeo.lower >= MIN_MAPSIZE); - mdbx_assert(env, meta.mm_geo.lower >= MIN_PAGENO); - mdbx_assert(env, env->me_dbgeo.upper <= MAX_MAPSIZE); - mdbx_assert(env, meta.mm_geo.upper <= MAX_PAGENO); - mdbx_assert(env, meta.mm_geo.now >= meta.mm_geo.next); - mdbx_assert(env, env->me_dbgeo.upper >= env->me_dbgeo.lower); - mdbx_assert(env, meta.mm_geo.upper >= meta.mm_geo.now); - mdbx_assert(env, meta.mm_geo.now >= meta.mm_geo.lower); - mdbx_assert(env, meta.mm_geo.grow == bytes2pgno(env, env->me_dbgeo.grow)); - mdbx_assert(env, - meta.mm_geo.shrink == bytes2pgno(env, env->me_dbgeo.shrink)); - - if (memcmp(&meta.mm_geo, &head->mm_geo, sizeof(meta.mm_geo))) { - if (meta.mm_geo.now != head->mm_geo.now || - meta.mm_geo.upper != head->mm_geo.upper) { - rc = mdbx_mapresize(env, meta.mm_geo.now, meta.mm_geo.upper); - if (unlikely(rc != MDBX_SUCCESS)) - goto bailout; - } - env->me_sync_pending += env->me_psize; - mdbx_meta_set_txnid(env, &meta, mdbx_meta_txnid_stable(env, head) + 1); - rc = mdbx_sync_locked(env, env->me_flags, &meta); - } - } else if (pagesize != (intptr_t)env->me_psize) { - mdbx_setup_pagesize(env, pagesize); - } - -bailout: - if (env->me_map && outside_txn) - mdbx_txn_unlock(env); - return rc; -} - -int __cold mdbx_env_set_mapsize(MDBX_env *env, size_t size) { - return mdbx_env_set_geometry(env, -1, size, -1, -1, -1, -1); -} - -int __cold mdbx_env_set_maxdbs(MDBX_env *env, MDBX_dbi dbs) { - if (unlikely(dbs > MAX_DBI)) - return MDBX_EINVAL; - - if (unlikely(!env)) - return MDBX_EINVAL; - - if (unlikely(env->me_signature != MDBX_ME_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(env->me_map)) - return MDBX_EPERM; - - env->me_maxdbs = dbs + CORE_DBS; - return MDBX_SUCCESS; -} - -int __cold mdbx_env_set_maxreaders(MDBX_env *env, unsigned readers) { - if (unlikely(readers < 1 || readers > INT16_MAX)) - return MDBX_EINVAL; - - if (unlikely(!env)) - return MDBX_EINVAL; - - if (unlikely(env->me_signature != MDBX_ME_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(env->me_map)) - return MDBX_EPERM; - - env->me_maxreaders = readers; - return MDBX_SUCCESS; -} - -int __cold mdbx_env_get_maxreaders(MDBX_env *env, unsigned *readers) { - if (!env || !readers) - return MDBX_EINVAL; - - if (unlikely(env->me_signature != MDBX_ME_SIGNATURE)) - return MDBX_EBADSIGN; - - *readers = env->me_maxreaders; - return MDBX_SUCCESS; -} - -/* Further setup required for opening an MDBX environment */ -static int __cold mdbx_setup_dxb(MDBX_env *env, int lck_rc) { - MDBX_meta meta; - int rc = MDBX_RESULT_FALSE; - int err = mdbx_read_header(env, &meta); - if (unlikely(err != MDBX_SUCCESS)) { - if (lck_rc != /* lck exclusive */ MDBX_RESULT_TRUE || err != MDBX_ENODATA || - (env->me_flags & MDBX_RDONLY) != 0) - return err; - - mdbx_debug("create new database"); - rc = /* new database */ MDBX_RESULT_TRUE; - - if (!env->me_dbgeo.now) { - /* set defaults if not configured */ - err = mdbx_env_set_mapsize(env, DEFAULT_MAPSIZE); - if (unlikely(err != MDBX_SUCCESS)) - return err; - } - - void *buffer = calloc(NUM_METAS, env->me_psize); - if (!buffer) - return MDBX_ENOMEM; - - meta = mdbx_init_metas(env, buffer)->mp_meta; - err = mdbx_pwrite(env->me_fd, buffer, env->me_psize * NUM_METAS, 0); - free(buffer); - if (unlikely(err != MDBX_SUCCESS)) - return err; - - err = mdbx_ftruncate(env->me_fd, env->me_dbgeo.now); - if (unlikely(err != MDBX_SUCCESS)) - return err; - -#ifndef NDEBUG /* just for checking */ - err = mdbx_read_header(env, &meta); - if (unlikely(err != MDBX_SUCCESS)) - return err; -#endif - } - - mdbx_info("header: root %" PRIaPGNO "/%" PRIaPGNO ", geo %" PRIaPGNO - "/%" PRIaPGNO "-%" PRIaPGNO "/%" PRIaPGNO - " +%u -%u, txn_id %" PRIaTXN ", %s", - meta.mm_dbs[MAIN_DBI].md_root, meta.mm_dbs[FREE_DBI].md_root, - meta.mm_geo.lower, meta.mm_geo.next, meta.mm_geo.now, - meta.mm_geo.upper, meta.mm_geo.grow, meta.mm_geo.shrink, - meta.mm_txnid_a, mdbx_durable_str(&meta)); - - mdbx_setup_pagesize(env, meta.mm_psize); - if ((env->me_flags & MDBX_RDONLY) /* readonly */ - || lck_rc != MDBX_RESULT_TRUE /* not exclusive */) { - /* use present params from db */ - err = mdbx_env_set_geometry( - env, meta.mm_geo.lower * (uint64_t)meta.mm_psize, - meta.mm_geo.now * (uint64_t)meta.mm_psize, - meta.mm_geo.upper * (uint64_t)meta.mm_psize, - meta.mm_geo.grow * (uint64_t)meta.mm_psize, - meta.mm_geo.shrink * (uint64_t)meta.mm_psize, meta.mm_psize); - if (unlikely(err != MDBX_SUCCESS)) { - mdbx_error("could not use present dbsize-params from db"); - return MDBX_INCOMPATIBLE; - } - } else if (env->me_dbgeo.now) { - /* silently growth to last used page */ - const size_t used_bytes = pgno2bytes(env, meta.mm_geo.next); - if (env->me_dbgeo.lower < used_bytes) - env->me_dbgeo.lower = used_bytes; - if (env->me_dbgeo.now < used_bytes) - env->me_dbgeo.now = used_bytes; - if (env->me_dbgeo.upper < used_bytes) - env->me_dbgeo.upper = used_bytes; - - /* apply preconfigured params, but only if substantial changes: - * - upper or lower limit changes - * - shrink theshold or growth step - * But ignore just chagne just a 'now/current' size. */ - if (bytes_align2os_bytes(env, env->me_dbgeo.upper) != - pgno_align2os_bytes(env, meta.mm_geo.upper) || - bytes_align2os_bytes(env, env->me_dbgeo.lower) != - pgno_align2os_bytes(env, meta.mm_geo.lower) || - bytes_align2os_bytes(env, env->me_dbgeo.shrink) != - pgno_align2os_bytes(env, meta.mm_geo.shrink) || - bytes_align2os_bytes(env, env->me_dbgeo.grow) != - pgno_align2os_bytes(env, meta.mm_geo.grow)) { - - if (env->me_dbgeo.shrink && env->me_dbgeo.now > used_bytes) - /* pre-shrink if enabled */ - env->me_dbgeo.now = used_bytes + env->me_dbgeo.shrink - - used_bytes % env->me_dbgeo.shrink; - - err = mdbx_env_set_geometry(env, env->me_dbgeo.lower, env->me_dbgeo.now, - env->me_dbgeo.upper, env->me_dbgeo.grow, - env->me_dbgeo.shrink, meta.mm_psize); - if (unlikely(err != MDBX_SUCCESS)) { - mdbx_error("could not apply preconfigured dbsize-params to db"); - return MDBX_INCOMPATIBLE; - } - - /* update meta fields */ - meta.mm_geo.now = bytes2pgno(env, env->me_dbgeo.now); - meta.mm_geo.lower = bytes2pgno(env, env->me_dbgeo.lower); - meta.mm_geo.upper = bytes2pgno(env, env->me_dbgeo.upper); - meta.mm_geo.grow = (uint16_t)bytes2pgno(env, env->me_dbgeo.grow); - meta.mm_geo.shrink = (uint16_t)bytes2pgno(env, env->me_dbgeo.shrink); - - mdbx_info("amended: root %" PRIaPGNO "/%" PRIaPGNO ", geo %" PRIaPGNO - "/%" PRIaPGNO "-%" PRIaPGNO "/%" PRIaPGNO - " +%u -%u, txn_id %" PRIaTXN ", %s", - meta.mm_dbs[MAIN_DBI].md_root, meta.mm_dbs[FREE_DBI].md_root, - meta.mm_geo.lower, meta.mm_geo.next, meta.mm_geo.now, - meta.mm_geo.upper, meta.mm_geo.grow, meta.mm_geo.shrink, - meta.mm_txnid_a, mdbx_durable_str(&meta)); - } - mdbx_ensure(env, meta.mm_geo.now >= meta.mm_geo.next); - } else { - /* geo-params not pre-configured by user, - * get current values from a meta. */ - env->me_dbgeo.now = pgno2bytes(env, meta.mm_geo.now); - env->me_dbgeo.lower = pgno2bytes(env, meta.mm_geo.lower); - env->me_dbgeo.upper = pgno2bytes(env, meta.mm_geo.upper); - env->me_dbgeo.grow = pgno2bytes(env, meta.mm_geo.grow); - env->me_dbgeo.shrink = pgno2bytes(env, meta.mm_geo.shrink); - } - - uint64_t filesize_before_mmap; - err = mdbx_filesize(env->me_fd, &filesize_before_mmap); - if (unlikely(err != MDBX_SUCCESS)) - return err; - - const size_t expected_bytes = - mdbx_roundup2(pgno2bytes(env, meta.mm_geo.now), env->me_os_psize); - const size_t used_bytes = pgno2bytes(env, meta.mm_geo.next); - mdbx_ensure(env, expected_bytes >= used_bytes); - if (filesize_before_mmap != expected_bytes) { - if (lck_rc != /* lck exclusive */ MDBX_RESULT_TRUE) { - mdbx_info("filesize mismatch (expect %" PRIuPTR "/%" PRIaPGNO - ", have %" PRIu64 "/%" PRIaPGNO "), " - "assume collision in non-exclusive mode", - expected_bytes, bytes2pgno(env, expected_bytes), - filesize_before_mmap, - bytes2pgno(env, (size_t)filesize_before_mmap)); - } else { - mdbx_notice("filesize mismatch (expect %" PRIuPTR "/%" PRIaPGNO - ", have %" PRIu64 "/%" PRIaPGNO ")", - expected_bytes, bytes2pgno(env, expected_bytes), - filesize_before_mmap, - bytes2pgno(env, (size_t)filesize_before_mmap)); - if (filesize_before_mmap < used_bytes) { - mdbx_error("last-page beyond end-of-file (last %" PRIaPGNO - ", have %" PRIaPGNO ")", - meta.mm_geo.next, - bytes2pgno(env, (size_t)filesize_before_mmap)); - return MDBX_CORRUPTED; - } - - if (env->me_flags & MDBX_RDONLY) { - mdbx_notice("ignore filesize mismatch in readonly-mode"); - } else { - mdbx_info("resize datafile to %" PRIu64 " bytes, %" PRIaPGNO " pages", - expected_bytes, bytes2pgno(env, expected_bytes)); - err = mdbx_ftruncate(env->me_fd, expected_bytes); - if (unlikely(err != MDBX_SUCCESS)) { - mdbx_error("error %d, while resize datafile to %" PRIu64 - " bytes, %" PRIaPGNO " pages", - rc, expected_bytes, bytes2pgno(env, expected_bytes)); - return err; - } - filesize_before_mmap = expected_bytes; - } - } - } - - err = mdbx_env_map(env, (lck_rc != /* lck exclusive */ MDBX_RESULT_TRUE) - ? 0 - : expected_bytes); - if (err != MDBX_SUCCESS) - return err; - - const unsigned meta_clash_mask = mdbx_meta_eq_mask(env); - if (meta_clash_mask) { - mdbx_error("meta-pages are clashed: mask 0x%d", meta_clash_mask); - return MDBX_WANNA_RECOVERY; - } - - while (1) { - MDBX_meta *head = mdbx_meta_head(env); - const txnid_t head_txnid = mdbx_meta_txnid_fluid(env, head); - if (head_txnid == meta.mm_txnid_a) - break; - - if (lck_rc == /* lck exclusive */ MDBX_RESULT_TRUE) { - assert(META_IS_STEADY(&meta) && !META_IS_STEADY(head)); - if (env->me_flags & MDBX_RDONLY) { - mdbx_error("rollback needed: (from head %" PRIaTXN - " to steady %" PRIaTXN "), but unable in read-only mode", - head_txnid, meta.mm_txnid_a); - return MDBX_WANNA_RECOVERY /* LY: could not recovery/rollback */; - } - - /* LY: rollback weak checkpoint */ - mdbx_trace("rollback: from %" PRIaTXN ", to %" PRIaTXN, head_txnid, - meta.mm_txnid_a); - mdbx_ensure(env, head_txnid == mdbx_meta_txnid_stable(env, head)); - - if (env->me_flags & MDBX_WRITEMAP) { - head->mm_txnid_a = 0; - head->mm_datasync_sign = MDBX_DATASIGN_WEAK; - head->mm_txnid_b = 0; - const size_t offset = - ((uint8_t *)container_of(head, MDBX_page, mp_meta)) - - env->me_dxb_mmap.dxb; - const size_t paged_offset = offset & ~(env->me_os_psize - 1); - const size_t paged_length = mdbx_roundup2( - env->me_psize + offset - paged_offset, env->me_os_psize); - err = mdbx_msync(&env->me_dxb_mmap, paged_offset, paged_length, false); - } else { - MDBX_meta rollback = *head; - mdbx_meta_set_txnid(env, &rollback, 0); - rollback.mm_datasync_sign = MDBX_DATASIGN_WEAK; - err = mdbx_pwrite(env->me_fd, &rollback, sizeof(MDBX_meta), - (uint8_t *)head - (uint8_t *)env->me_map); - } - if (err) - return err; - - mdbx_invalidate_cache(env->me_map, pgno2bytes(env, NUM_METAS)); - mdbx_ensure(env, 0 == mdbx_meta_txnid_fluid(env, head)); - mdbx_ensure(env, 0 == mdbx_meta_eq_mask(env)); - continue; - } - - if (!env->me_lck) { - /* LY: without-lck (read-only) mode, so it is imposible that other - * process made weak checkpoint. */ - mdbx_error("without-lck, unable recovery/rollback"); - return MDBX_WANNA_RECOVERY; - } - - /* LY: assume just have a collision with other running process, - * or someone make a weak checkpoint */ - mdbx_info("assume collision or online weak checkpoint"); - break; - } - - const MDBX_meta *head = mdbx_meta_head(env); - if (lck_rc == /* lck exclusive */ MDBX_RESULT_TRUE) { - /* re-check file size after mmap */ - uint64_t filesize_after_mmap; - err = mdbx_filesize(env->me_fd, &filesize_after_mmap); - if (unlikely(err != MDBX_SUCCESS)) - return err; - if (filesize_after_mmap != expected_bytes) { - if (filesize_after_mmap != filesize_before_mmap) - mdbx_info("datafile resized by system to %" PRIu64 " bytes", - filesize_after_mmap); - if (filesize_after_mmap % env->me_os_psize || - filesize_after_mmap > env->me_dbgeo.upper || - filesize_after_mmap < used_bytes) { - mdbx_info("unacceptable/unexpected datafile size %" PRIu64, - filesize_after_mmap); - return MDBX_PROBLEM; - } - if ((env->me_flags & MDBX_RDONLY) == 0) { - meta.mm_geo.now = - bytes2pgno(env, env->me_dbgeo.now = (size_t)filesize_after_mmap); - mdbx_info("update meta-geo to filesize %" PRIuPTR " bytes, %" PRIaPGNO - " pages", - env->me_dbgeo.now, meta.mm_geo.now); - } - } - - if (memcmp(&meta.mm_geo, &head->mm_geo, sizeof(meta.mm_geo))) { - const txnid_t txnid = mdbx_meta_txnid_stable(env, head); - mdbx_info("updating meta.geo: " - "from l%" PRIaPGNO "-n%" PRIaPGNO "-u%" PRIaPGNO - "/s%u-g%u (txn#%" PRIaTXN "), " - "to l%" PRIaPGNO "-n%" PRIaPGNO "-u%" PRIaPGNO - "/s%u-g%u (txn#%" PRIaTXN ")", - head->mm_geo.lower, head->mm_geo.now, head->mm_geo.upper, - head->mm_geo.shrink, head->mm_geo.grow, txnid, - meta.mm_geo.lower, meta.mm_geo.now, meta.mm_geo.upper, - meta.mm_geo.shrink, meta.mm_geo.grow, txnid + 1); - - mdbx_ensure(env, mdbx_meta_eq(env, &meta, head)); - mdbx_meta_set_txnid(env, &meta, txnid + 1); - env->me_sync_pending += env->me_psize; - err = mdbx_sync_locked(env, env->me_flags | MDBX_SHRINK_ALLOWED, &meta); - if (err) { - mdbx_info("error %d, while updating meta.geo: " - "from l%" PRIaPGNO "-n%" PRIaPGNO "-u%" PRIaPGNO - "/s%u-g%u (txn#%" PRIaTXN "), " - "to l%" PRIaPGNO "-n%" PRIaPGNO "-u%" PRIaPGNO - "/s%u-g%u (txn#%" PRIaTXN ")", - err, head->mm_geo.lower, head->mm_geo.now, head->mm_geo.upper, - head->mm_geo.shrink, head->mm_geo.grow, txnid, - meta.mm_geo.lower, meta.mm_geo.now, meta.mm_geo.upper, - meta.mm_geo.shrink, meta.mm_geo.grow, txnid + 1); - return err; - } - } - } - - return rc; -} - -/****************************************************************************/ - -/* Open and/or initialize the lock region for the environment. */ -static int __cold mdbx_setup_lck(MDBX_env *env, char *lck_pathname, - mode_t mode) { - assert(env->me_fd != INVALID_HANDLE_VALUE); - assert(env->me_lfd == INVALID_HANDLE_VALUE); - - int err = mdbx_openfile(lck_pathname, O_RDWR | O_CREAT, mode, &env->me_lfd); - if (err != MDBX_SUCCESS) { - if (err != MDBX_EROFS || (env->me_flags & MDBX_RDONLY) == 0) - return err; - /* LY: without-lck mode (e.g. on read-only filesystem) */ - env->me_lfd = INVALID_HANDLE_VALUE; - env->me_oldest = &env->me_oldest_stub; - env->me_maxreaders = UINT_MAX; - mdbx_debug("lck-setup: %s ", "lockless mode (readonly)"); - return MDBX_SUCCESS; - } - - /* Try to get exclusive lock. If we succeed, then - * nobody is using the lock region and we should initialize it. */ - const int rc = mdbx_lck_seize(env); - if (MDBX_IS_ERROR(rc)) - return rc; - - mdbx_debug("lck-setup: %s ", - (rc == MDBX_RESULT_TRUE) ? "exclusive" : "shared"); - - uint64_t size; - err = mdbx_filesize(env->me_lfd, &size); - if (unlikely(err != MDBX_SUCCESS)) - return err; - - if (rc == MDBX_RESULT_TRUE) { - uint64_t wanna = mdbx_roundup2( - (env->me_maxreaders - 1) * sizeof(MDBX_reader) + sizeof(MDBX_lockinfo), - env->me_os_psize); -#ifndef NDEBUG - err = mdbx_ftruncate(env->me_lfd, size = 0); - if (unlikely(err != MDBX_SUCCESS)) - return err; -#endif - mdbx_jitter4testing(false); - - if (size != wanna) { - err = mdbx_ftruncate(env->me_lfd, wanna); - if (unlikely(err != MDBX_SUCCESS)) - return err; - size = wanna; - } - } else if (size > SSIZE_MAX || (size & (env->me_os_psize - 1)) || - size < env->me_os_psize) { - mdbx_notice("lck-file has invalid size %" PRIu64 " bytes", size); - return MDBX_PROBLEM; - } - - const size_t maxreaders = - ((size_t)size - sizeof(MDBX_lockinfo)) / sizeof(MDBX_reader) + 1; - if (maxreaders > UINT16_MAX) { - mdbx_error("lck-size too big (up to %" PRIuPTR " readers)", maxreaders); - return MDBX_PROBLEM; - } - env->me_maxreaders = (unsigned)maxreaders; - - err = mdbx_mmap(MDBX_WRITEMAP, &env->me_lck_mmap, (size_t)size, (size_t)size); - if (unlikely(err != MDBX_SUCCESS)) - return err; - -#ifdef MADV_DODUMP - (void)madvise(env->me_lck, size, MADV_DODUMP); -#endif - -#ifdef MADV_DONTFORK - if (madvise(env->me_lck, size, MADV_DONTFORK) < 0) - return errno; -#endif - -#ifdef MADV_WILLNEED - if (madvise(env->me_lck, size, MADV_WILLNEED) < 0) - return errno; -#endif - -#ifdef MADV_RANDOM - if (madvise(env->me_lck, size, MADV_RANDOM) < 0) - return errno; -#endif - - if (rc == MDBX_RESULT_TRUE) { - /* LY: exlcusive mode, init lck */ - memset(env->me_lck, 0, (size_t)size); - err = mdbx_lck_init(env); - if (err) - return err; - - env->me_lck->mti_magic_and_version = MDBX_LOCK_MAGIC; - env->me_lck->mti_os_and_format = MDBX_LOCK_FORMAT; - } else { - if (env->me_lck->mti_magic_and_version != MDBX_LOCK_MAGIC) { - mdbx_error("lock region has invalid magic/version"); - return ((env->me_lck->mti_magic_and_version >> 8) != MDBX_MAGIC) - ? MDBX_INVALID - : MDBX_VERSION_MISMATCH; - } - if (env->me_lck->mti_os_and_format != MDBX_LOCK_FORMAT) { - mdbx_error("lock region has os/format 0x%" PRIx32 ", expected 0x%" PRIx32, - env->me_lck->mti_os_and_format, MDBX_LOCK_FORMAT); - return MDBX_VERSION_MISMATCH; - } - } - - mdbx_assert(env, !MDBX_IS_ERROR(rc)); - env->me_oldest = &env->me_lck->mti_oldest; - return rc; -} - -/* Only a subset of the mdbx_env flags can be changed - * at runtime. Changing other flags requires closing the - * environment and re-opening it with the new flags. */ -#define CHANGEABLE \ - (MDBX_NOSYNC | MDBX_NOMETASYNC | MDBX_MAPASYNC | MDBX_NOMEMINIT | \ - MDBX_COALESCE | MDBX_PAGEPERTURB) -#define CHANGELESS \ - (MDBX_NOSUBDIR | MDBX_RDONLY | MDBX_WRITEMAP | MDBX_NOTLS | MDBX_NORDAHEAD | \ - MDBX_LIFORECLAIM) - -#if VALID_FLAGS & PERSISTENT_FLAGS & (CHANGEABLE | CHANGELESS) -#error "Persistent DB flags & env flags overlap, but both go in mm_flags" -#endif - -int __cold mdbx_env_open_ex(MDBX_env *env, const char *path, unsigned flags, - mode_t mode, int *exclusive) { - if (unlikely(!env || !path)) - return MDBX_EINVAL; - - if (unlikely(env->me_signature != MDBX_ME_SIGNATURE)) - return MDBX_EBADSIGN; - - if (env->me_fd != INVALID_HANDLE_VALUE || - (flags & ~(CHANGEABLE | CHANGELESS))) - return MDBX_EINVAL; - - size_t len_full, len = strlen(path); - if (flags & MDBX_NOSUBDIR) { - len_full = len + sizeof(MDBX_LOCK_SUFFIX) + len + 1; - } else { - len_full = len + sizeof(MDBX_LOCKNAME) + len + sizeof(MDBX_DATANAME); - } - char *lck_pathname = malloc(len_full); - if (!lck_pathname) - return MDBX_ENOMEM; - - char *dxb_pathname; - if (flags & MDBX_NOSUBDIR) { - dxb_pathname = lck_pathname + len + sizeof(MDBX_LOCK_SUFFIX); - sprintf(lck_pathname, "%s" MDBX_LOCK_SUFFIX, path); - strcpy(dxb_pathname, path); - } else { - dxb_pathname = lck_pathname + len + sizeof(MDBX_LOCKNAME); - sprintf(lck_pathname, "%s" MDBX_LOCKNAME, path); - sprintf(dxb_pathname, "%s" MDBX_DATANAME, path); - } - - int rc = MDBX_SUCCESS; - flags |= env->me_flags; - if (flags & MDBX_RDONLY) { - /* LY: silently ignore irrelevant flags when - * we're only getting read access */ - flags &= ~(MDBX_WRITEMAP | MDBX_MAPASYNC | MDBX_NOSYNC | MDBX_NOMETASYNC | - MDBX_COALESCE | MDBX_LIFORECLAIM | MDBX_NOMEMINIT); - } else { - if (!((env->me_free_pgs = mdbx_pnl_alloc(MDBX_PNL_UM_MAX)) && - (env->me_dirtylist = calloc(MDBX_PNL_UM_SIZE, sizeof(MDBX_ID2))))) - rc = MDBX_ENOMEM; - } - env->me_flags = flags |= MDBX_ENV_ACTIVE; - if (rc) - goto bailout; - - env->me_path = mdbx_strdup(path); - env->me_dbxs = calloc(env->me_maxdbs, sizeof(MDBX_dbx)); - env->me_dbflags = calloc(env->me_maxdbs, sizeof(uint16_t)); - env->me_dbiseqs = calloc(env->me_maxdbs, sizeof(unsigned)); - if (!(env->me_dbxs && env->me_path && env->me_dbflags && env->me_dbiseqs)) { - rc = MDBX_ENOMEM; - goto bailout; - } - env->me_dbxs[FREE_DBI].md_cmp = mdbx_cmp_int_ai; /* aligned MDBX_INTEGERKEY */ - - int oflags; - if (F_ISSET(flags, MDBX_RDONLY)) - oflags = O_RDONLY; - else - oflags = O_RDWR | O_CREAT; - - rc = mdbx_openfile(dxb_pathname, oflags, mode, &env->me_fd); - if (rc != MDBX_SUCCESS) - goto bailout; - - const int lck_rc = mdbx_setup_lck(env, lck_pathname, mode); - if (MDBX_IS_ERROR(lck_rc)) { - rc = lck_rc; - goto bailout; - } - - const int dxb_rc = mdbx_setup_dxb(env, lck_rc); - if (MDBX_IS_ERROR(dxb_rc)) { - rc = dxb_rc; - goto bailout; - } - - mdbx_debug("opened dbenv %p", (void *)env); - const unsigned mode_flags = - MDBX_WRITEMAP | MDBX_NOSYNC | MDBX_NOMETASYNC | MDBX_MAPASYNC; - if (lck_rc == MDBX_RESULT_TRUE) { - env->me_lck->mti_envmode = env->me_flags & (mode_flags | MDBX_RDONLY); - if (exclusive == NULL || *exclusive < 2) { - /* LY: downgrade lock only if exclusive access not requested. - * in case exclusive==1, just leave value as is. */ - rc = mdbx_lck_downgrade(env, true); - mdbx_debug("lck-downgrade-full: rc %i ", rc); - } else { - rc = mdbx_lck_downgrade(env, false); - mdbx_debug("lck-downgrade-partial: rc %i ", rc); - } - if (rc != MDBX_SUCCESS) - goto bailout; - } else { - if (exclusive) { - /* LY: just indicate that is not an exclusive access. */ - *exclusive = 0; - } - if ((env->me_flags & MDBX_RDONLY) == 0) { - while (env->me_lck->mti_envmode == MDBX_RDONLY) { - if (mdbx_atomic_compare_and_swap32(&env->me_lck->mti_envmode, - MDBX_RDONLY, - env->me_flags & mode_flags)) - break; - /* TODO: yield/relax cpu */ - } - if ((env->me_lck->mti_envmode ^ env->me_flags) & mode_flags) { - mdbx_error("current mode/flags incompatible with requested"); - rc = MDBX_INCOMPATIBLE; - goto bailout; - } - } - } - - if (env->me_lck && (env->me_flags & MDBX_NOTLS) == 0) { - rc = mdbx_rthc_alloc(&env->me_txkey, &env->me_lck->mti_readers[0], - &env->me_lck->mti_readers[env->me_maxreaders]); - if (unlikely(rc != MDBX_SUCCESS)) - goto bailout; - env->me_flags |= MDBX_ENV_TXKEY; - } - - if ((flags & MDBX_RDONLY) == 0) { - MDBX_txn *txn; - int tsize = sizeof(MDBX_txn), - size = tsize + - env->me_maxdbs * (sizeof(MDBX_db) + sizeof(MDBX_cursor *) + - sizeof(unsigned) + 1); - if ((env->me_pbuf = calloc(1, env->me_psize)) && (txn = calloc(1, size))) { - txn->mt_dbs = (MDBX_db *)((char *)txn + tsize); - txn->mt_cursors = (MDBX_cursor **)(txn->mt_dbs + env->me_maxdbs); - txn->mt_dbiseqs = (unsigned *)(txn->mt_cursors + env->me_maxdbs); - txn->mt_dbflags = (uint8_t *)(txn->mt_dbiseqs + env->me_maxdbs); - txn->mt_env = env; - txn->mt_dbxs = env->me_dbxs; - txn->mt_flags = MDBX_TXN_FINISHED; - env->me_txn0 = txn; - } else { - rc = MDBX_ENOMEM; - } - } - -#if MDBX_DEBUG - if (rc == MDBX_SUCCESS) { - MDBX_meta *meta = mdbx_meta_head(env); - MDBX_db *db = &meta->mm_dbs[MAIN_DBI]; - - mdbx_debug("opened database version %u, pagesize %u", - (uint8_t)meta->mm_magic_and_version, env->me_psize); - mdbx_debug("using meta page %" PRIaPGNO ", txn %" PRIaTXN "", - container_of(meta, MDBX_page, mp_data)->mp_pgno, - mdbx_meta_txnid_fluid(env, meta)); - mdbx_debug("depth: %u", db->md_depth); - mdbx_debug("entries: %" PRIu64 "", db->md_entries); - mdbx_debug("branch pages: %" PRIaPGNO "", db->md_branch_pages); - mdbx_debug("leaf pages: %" PRIaPGNO "", db->md_leaf_pages); - mdbx_debug("overflow pages: %" PRIaPGNO "", db->md_overflow_pages); - mdbx_debug("root: %" PRIaPGNO "", db->md_root); - } -#endif - -bailout: - if (rc) - mdbx_env_close0(env); - free(lck_pathname); - return rc; -} - -int __cold mdbx_env_open(MDBX_env *env, const char *path, unsigned flags, - mode_t mode) { - return mdbx_env_open_ex(env, path, flags, mode, NULL); -} - -/* Destroy resources from mdbx_env_open(), clear our readers & DBIs */ -static void __cold mdbx_env_close0(MDBX_env *env) { - if (!(env->me_flags & MDBX_ENV_ACTIVE)) - return; - env->me_flags &= ~MDBX_ENV_ACTIVE; - - /* Doing this here since me_dbxs may not exist during mdbx_env_close */ - if (env->me_dbxs) { - for (unsigned i = env->me_maxdbs; --i >= CORE_DBS;) - free(env->me_dbxs[i].md_name.iov_base); - free(env->me_dbxs); - } - - free(env->me_pbuf); - free(env->me_dbiseqs); - free(env->me_dbflags); - free(env->me_path); - free(env->me_dirtylist); - if (env->me_txn0) { - mdbx_txl_free(env->me_txn0->mt_lifo_reclaimed); - free(env->me_txn0); - } - mdbx_pnl_free(env->me_free_pgs); - - if (env->me_flags & MDBX_ENV_TXKEY) { - mdbx_rthc_remove(env->me_txkey); - env->me_flags &= ~MDBX_ENV_TXKEY; - } - - if (env->me_map) { - mdbx_munmap(&env->me_dxb_mmap); -#ifdef USE_VALGRIND - VALGRIND_DISCARD(env->me_valgrind_handle); - env->me_valgrind_handle = -1; -#endif - } - if (env->me_fd != INVALID_HANDLE_VALUE) { - (void)mdbx_closefile(env->me_fd); - env->me_fd = INVALID_HANDLE_VALUE; - } - - if (env->me_lck) - mdbx_munmap(&env->me_lck_mmap); - env->me_pid = 0; - env->me_oldest = nullptr; - - mdbx_lck_destroy(env); - if (env->me_lfd != INVALID_HANDLE_VALUE) { - (void)mdbx_closefile(env->me_lfd); - env->me_lfd = INVALID_HANDLE_VALUE; - } -} - -int __cold mdbx_env_close_ex(MDBX_env *env, int dont_sync) { - MDBX_page *dp; - int rc = MDBX_SUCCESS; - - if (unlikely(!env)) - return MDBX_EINVAL; - if (unlikely(env->me_signature != MDBX_ME_SIGNATURE)) - return MDBX_EBADSIGN; - - if (!dont_sync && !(env->me_flags & MDBX_RDONLY)) - rc = mdbx_env_sync(env, true); - - VALGRIND_DESTROY_MEMPOOL(env); - while ((dp = env->me_dpages) != NULL) { - ASAN_UNPOISON_MEMORY_REGION(&dp->mp_next, sizeof(dp->mp_next)); - VALGRIND_MAKE_MEM_DEFINED(&dp->mp_next, sizeof(dp->mp_next)); - env->me_dpages = dp->mp_next; - free(dp); - } - - mdbx_env_close0(env); - mdbx_ensure(env, mdbx_fastmutex_destroy(&env->me_dbi_lock) == MDBX_SUCCESS); - env->me_signature = 0; - free(env); - - return rc; -} - -void __cold mdbx_env_close(MDBX_env *env) { mdbx_env_close_ex(env, 0); } - -/* Compare two items pointing at aligned unsigned int's. */ -static int __hot mdbx_cmp_int_ai(const MDBX_val *a, const MDBX_val *b) { - mdbx_assert(NULL, a->iov_len == b->iov_len); - mdbx_assert(NULL, 0 == (uintptr_t)a->iov_base % sizeof(int) && - 0 == (uintptr_t)b->iov_base % sizeof(int)); - switch (a->iov_len) { - case 4: - return mdbx_cmp2int(*(uint32_t *)a->iov_base, *(uint32_t *)b->iov_base); - case 8: - return mdbx_cmp2int(*(uint64_t *)a->iov_base, *(uint64_t *)b->iov_base); - default: - mdbx_assert_fail(NULL, "invalid size for INTEGERKEY/INTEGERDUP", mdbx_func_, - __LINE__); - return 0; - } -} - -/* Compare two items pointing at 2-byte aligned unsigned int's. */ -static int __hot mdbx_cmp_int_a2(const MDBX_val *a, const MDBX_val *b) { - mdbx_assert(NULL, a->iov_len == b->iov_len); - mdbx_assert(NULL, 0 == (uintptr_t)a->iov_base % sizeof(uint16_t) && - 0 == (uintptr_t)b->iov_base % sizeof(uint16_t)); -#if UNALIGNED_OK - switch (a->iov_len) { - case 4: - return mdbx_cmp2int(*(uint32_t *)a->iov_base, *(uint32_t *)b->iov_base); - case 8: - return mdbx_cmp2int(*(uint64_t *)a->iov_base, *(uint64_t *)b->iov_base); - default: - mdbx_assert_fail(NULL, "invalid size for INTEGERKEY/INTEGERDUP", mdbx_func_, - __LINE__); - return 0; - } -#else - mdbx_assert(NULL, 0 == a->iov_len % sizeof(uint16_t)); - { - int diff; - const uint16_t *pa, *pb, *end; - -#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ - end = (const uint16_t *)a->iov_base; - pa = (const uint16_t *)((char *)a->iov_base + a->iov_len); - pb = (const uint16_t *)((char *)b->iov_base + a->iov_len); - do { - diff = *--pa - *--pb; -#else /* __BYTE_ORDER__ */ - end = (const uint16_t *)((char *)a->iov_base + a->iov_len); - pa = (const uint16_t *)a->iov_base; - pb = (const uint16_t *)b->iov_base; - do { - diff = *pa++ - *pb++; -#endif /* __BYTE_ORDER__ */ - if (likely(diff != 0)) - break; - } while (pa != end); - return diff; - } -#endif /* UNALIGNED_OK */ -} - -/* Compare two items pointing at unsigneds of unknown alignment. - * - * This is also set as MDBX_INTEGERDUP|MDBX_DUPFIXED's MDBX_dbx.md_dcmp. */ -static int __hot mdbx_cmp_int_ua(const MDBX_val *a, const MDBX_val *b) { - mdbx_assert(NULL, a->iov_len == b->iov_len); -#if UNALIGNED_OK - switch (a->iov_len) { - case 4: - return mdbx_cmp2int(*(uint32_t *)a->iov_base, *(uint32_t *)b->iov_base); - case 8: - return mdbx_cmp2int(*(uint64_t *)a->iov_base, *(uint64_t *)b->iov_base); - default: - mdbx_assert_fail(NULL, "invalid size for INTEGERKEY/INTEGERDUP", mdbx_func_, - __LINE__); - return 0; - } -#else - mdbx_assert(NULL, a->iov_len == sizeof(int) || a->iov_len == sizeof(size_t)); -#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ - { - int diff; - const uint8_t *pa, *pb; - - pa = (const uint8_t *)a->iov_base + a->iov_len; - pb = (const uint8_t *)b->iov_base + a->iov_len; - - do { - diff = *--pa - *--pb; - if (likely(diff != 0)) - break; - } while (pa != a->iov_base); - return diff; - } -#else /* __BYTE_ORDER__ */ - return memcmp(a->iov_base, b->iov_base, a->iov_len); -#endif /* __BYTE_ORDER__ */ -#endif /* UNALIGNED_OK */ -} - -/* Compare two items lexically */ -static int __hot mdbx_cmp_memn(const MDBX_val *a, const MDBX_val *b) { -/* LY: assumes that length of keys are NOT equal for most cases, - * if no then branch-prediction should mitigate the problem */ -#if 0 - /* LY: without branch instructions on x86, - * but isn't best for equal length of keys */ - int diff_len = mdbx_cmp2int(a->iov_len, b->iov_len); -#else - /* LY: best when length of keys are equal, - * but got a branch-penalty otherwise */ - if (likely(a->iov_len == b->iov_len)) - return memcmp(a->iov_base, b->iov_base, a->iov_len); - int diff_len = (a->iov_len < b->iov_len) ? -1 : 1; -#endif - size_t shortest = (a->iov_len < b->iov_len) ? a->iov_len : b->iov_len; - int diff_data = memcmp(a->iov_base, b->iov_base, shortest); - return likely(diff_data) ? diff_data : diff_len; -} - -/* Compare two items in reverse byte order */ -static int __hot mdbx_cmp_memnr(const MDBX_val *a, const MDBX_val *b) { - const uint8_t *pa, *pb, *end; - - pa = (const uint8_t *)a->iov_base + a->iov_len; - pb = (const uint8_t *)b->iov_base + b->iov_len; - size_t minlen = (a->iov_len < b->iov_len) ? a->iov_len : b->iov_len; - end = pa - minlen; - - while (pa != end) { - int diff = *--pa - *--pb; - if (likely(diff)) - return diff; - } - return mdbx_cmp2int(a->iov_len, b->iov_len); -} - -/* Search for key within a page, using binary search. - * Returns the smallest entry larger or equal to the key. - * If exactp is non-null, stores whether the found entry was an exact match - * in *exactp (1 or 0). - * Updates the cursor index with the index of the found entry. - * If no entry larger or equal to the key is found, returns NULL. */ -static MDBX_node *__hot mdbx_node_search(MDBX_cursor *mc, MDBX_val *key, - int *exactp) { - unsigned i = 0, nkeys; - int low, high; - int rc = 0; - MDBX_page *mp = mc->mc_pg[mc->mc_top]; - MDBX_node *node = NULL; - MDBX_val nodekey; - MDBX_cmp_func *cmp; - DKBUF; - - nkeys = NUMKEYS(mp); - - mdbx_debug("searching %u keys in %s %spage %" PRIaPGNO "", nkeys, - IS_LEAF(mp) ? "leaf" : "branch", IS_SUBP(mp) ? "sub-" : "", - mp->mp_pgno); - - low = IS_LEAF(mp) ? 0 : 1; - high = nkeys - 1; - cmp = mc->mc_dbx->md_cmp; - - /* Branch pages have no data, so if using integer keys, - * alignment is guaranteed. Use faster mdbx_cmp_int_ai. - */ - if (cmp == mdbx_cmp_int_a2 && IS_BRANCH(mp)) - cmp = mdbx_cmp_int_ai; - - if (IS_LEAF2(mp)) { - nodekey.iov_len = mc->mc_db->md_xsize; - node = NODEPTR(mp, 0); /* fake */ - while (low <= high) { - i = (low + high) >> 1; - nodekey.iov_base = LEAF2KEY(mp, i, nodekey.iov_len); - rc = cmp(key, &nodekey); - mdbx_debug("found leaf index %u [%s], rc = %i", i, DKEY(&nodekey), rc); - if (rc == 0) - break; - if (rc > 0) - low = i + 1; - else - high = i - 1; - } - } else { - while (low <= high) { - i = (low + high) >> 1; - - node = NODEPTR(mp, i); - nodekey.iov_len = NODEKSZ(node); - nodekey.iov_base = NODEKEY(node); - - rc = cmp(key, &nodekey); - if (IS_LEAF(mp)) - mdbx_debug("found leaf index %u [%s], rc = %i", i, DKEY(&nodekey), rc); - else - mdbx_debug("found branch index %u [%s -> %" PRIaPGNO "], rc = %i", i, - DKEY(&nodekey), NODEPGNO(node), rc); - if (rc == 0) - break; - if (rc > 0) - low = i + 1; - else - high = i - 1; - } - } - - if (rc > 0) /* Found entry is less than the key. */ - i++; /* Skip to get the smallest entry larger than key. */ - - if (exactp) - *exactp = (rc == 0 && nkeys > 0); - /* store the key index */ - mdbx_cassert(mc, i <= UINT16_MAX); - mc->mc_ki[mc->mc_top] = (indx_t)i; - if (i >= nkeys) - /* There is no entry larger or equal to the key. */ - return NULL; - - /* nodeptr is fake for LEAF2 */ - return IS_LEAF2(mp) ? node : NODEPTR(mp, i); -} - -#if 0 /* unused for now */ -static void mdbx_cursor_adjust(MDBX_cursor *mc, func) { - MDBX_cursor *m2; - - for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2 = m2->mc_next) { - if (m2->mc_pg[m2->mc_top] == mc->mc_pg[mc->mc_top]) { - func(mc, m2); - } - } -} -#endif - -/* Pop a page off the top of the cursor's stack. */ -static void mdbx_cursor_pop(MDBX_cursor *mc) { - if (mc->mc_snum) { - mdbx_debug("popped page %" PRIaPGNO " off db %d cursor %p", - mc->mc_pg[mc->mc_top]->mp_pgno, DDBI(mc), (void *)mc); - - mc->mc_snum--; - if (mc->mc_snum) { - mc->mc_top--; - } else { - mc->mc_flags &= ~C_INITIALIZED; - } - } -} - -/* Push a page onto the top of the cursor's stack. - * Set MDBX_TXN_ERROR on failure. */ -static int mdbx_cursor_push(MDBX_cursor *mc, MDBX_page *mp) { - mdbx_debug("pushing page %" PRIaPGNO " on db %d cursor %p", mp->mp_pgno, - DDBI(mc), (void *)mc); - - if (unlikely(mc->mc_snum >= CURSOR_STACK)) { - mc->mc_txn->mt_flags |= MDBX_TXN_ERROR; - return MDBX_CURSOR_FULL; - } - - mdbx_cassert(mc, mc->mc_snum < UINT16_MAX); - mc->mc_top = mc->mc_snum++; - mc->mc_pg[mc->mc_top] = mp; - mc->mc_ki[mc->mc_top] = 0; - - return MDBX_SUCCESS; -} - -/* Find the address of the page corresponding to a given page number. - * Set MDBX_TXN_ERROR on failure. - * - * [in] mc the cursor accessing the page. - * [in] pgno the page number for the page to retrieve. - * [out] ret address of a pointer where the page's address will be - * stored. - * [out] lvl dirtylist inheritance level of found page. 1=current txn, - * 0=mapped page. - * - * Returns 0 on success, non-zero on failure. */ -static int mdbx_page_get(MDBX_cursor *mc, pgno_t pgno, MDBX_page **ret, - int *lvl) { - MDBX_txn *txn = mc->mc_txn; - MDBX_env *env = txn->mt_env; - MDBX_page *p = NULL; - int level; - - if (!(txn->mt_flags & (MDBX_TXN_RDONLY | MDBX_TXN_WRITEMAP))) { - MDBX_txn *tx2 = txn; - level = 1; - do { - MDBX_ID2L dl = tx2->mt_rw_dirtylist; - unsigned x; - /* Spilled pages were dirtied in this txn and flushed - * because the dirty list got full. Bring this page - * back in from the map (but don't unspill it here, - * leave that unless page_touch happens again). */ - if (tx2->mt_spill_pages) { - pgno_t pn = pgno << 1; - x = mdbx_pnl_search(tx2->mt_spill_pages, pn); - if (x <= tx2->mt_spill_pages[0] && tx2->mt_spill_pages[x] == pn) - goto mapped; - } - if (dl[0].mid) { - unsigned y = mdbx_mid2l_search(dl, pgno); - if (y <= dl[0].mid && dl[y].mid == pgno) { - p = dl[y].mptr; - goto done; - } - } - level++; - } while ((tx2 = tx2->mt_parent) != NULL); - } - - if (unlikely(pgno >= txn->mt_next_pgno)) { - mdbx_debug("page %" PRIaPGNO " not found", pgno); - txn->mt_flags |= MDBX_TXN_ERROR; - return MDBX_PAGE_NOTFOUND; - } - level = 0; - -mapped: - p = pgno2page(env, pgno); -/* TODO: check p->mp_validator here */ - -done: - *ret = p; - if (lvl) - *lvl = level; - return MDBX_SUCCESS; -} - -/* Finish mdbx_page_search() / mdbx_page_search_lowest(). - * The cursor is at the root page, set up the rest of it. */ -static int mdbx_page_search_root(MDBX_cursor *mc, MDBX_val *key, int flags) { - MDBX_page *mp = mc->mc_pg[mc->mc_top]; - int rc; - DKBUF; - - while (IS_BRANCH(mp)) { - MDBX_node *node; - indx_t i; - - mdbx_debug("branch page %" PRIaPGNO " has %u keys", mp->mp_pgno, - NUMKEYS(mp)); - /* Don't assert on branch pages in the FreeDB. We can get here - * while in the process of rebalancing a FreeDB branch page; we must - * let that proceed. ITS#8336 */ - mdbx_cassert(mc, !mc->mc_dbi || NUMKEYS(mp) > 1); - mdbx_debug("found index 0 to page %" PRIaPGNO "", NODEPGNO(NODEPTR(mp, 0))); - - if (flags & (MDBX_PS_FIRST | MDBX_PS_LAST)) { - i = 0; - if (flags & MDBX_PS_LAST) { - i = NUMKEYS(mp) - 1; - /* if already init'd, see if we're already in right place */ - if (mc->mc_flags & C_INITIALIZED) { - if (mc->mc_ki[mc->mc_top] == i) { - mc->mc_top = mc->mc_snum++; - mp = mc->mc_pg[mc->mc_top]; - goto ready; - } - } - } - } else { - int exact; - node = mdbx_node_search(mc, key, &exact); - if (node == NULL) - i = NUMKEYS(mp) - 1; - else { - i = mc->mc_ki[mc->mc_top]; - if (!exact) { - mdbx_cassert(mc, i > 0); - i--; - } - } - mdbx_debug("following index %u for key [%s]", i, DKEY(key)); - } - - mdbx_cassert(mc, i < NUMKEYS(mp)); - node = NODEPTR(mp, i); - - if (unlikely((rc = mdbx_page_get(mc, NODEPGNO(node), &mp, NULL)) != 0)) - return rc; - - mc->mc_ki[mc->mc_top] = i; - if (unlikely(rc = mdbx_cursor_push(mc, mp))) - return rc; - - ready: - if (flags & MDBX_PS_MODIFY) { - if (unlikely((rc = mdbx_page_touch(mc)) != 0)) - return rc; - mp = mc->mc_pg[mc->mc_top]; - } - } - - if (unlikely(!IS_LEAF(mp))) { - mdbx_debug("internal error, index points to a page with 0x%02x flags!?", - mp->mp_flags); - mc->mc_txn->mt_flags |= MDBX_TXN_ERROR; - return MDBX_CORRUPTED; - } - - mdbx_debug("found leaf page %" PRIaPGNO " for key [%s]", mp->mp_pgno, - DKEY(key)); - mc->mc_flags |= C_INITIALIZED; - mc->mc_flags &= ~C_EOF; - - return MDBX_SUCCESS; -} - -/* Search for the lowest key under the current branch page. - * This just bypasses a NUMKEYS check in the current page - * before calling mdbx_page_search_root(), because the callers - * are all in situations where the current page is known to - * be underfilled. */ -static int mdbx_page_search_lowest(MDBX_cursor *mc) { - MDBX_page *mp = mc->mc_pg[mc->mc_top]; - MDBX_node *node = NODEPTR(mp, 0); - int rc; - - if (unlikely((rc = mdbx_page_get(mc, NODEPGNO(node), &mp, NULL)) != 0)) - return rc; - - mc->mc_ki[mc->mc_top] = 0; - if (unlikely(rc = mdbx_cursor_push(mc, mp))) - return rc; - return mdbx_page_search_root(mc, NULL, MDBX_PS_FIRST); -} - -/* Search for the page a given key should be in. - * Push it and its parent pages on the cursor stack. - * - * [in,out] mc the cursor for this operation. - * [in] key the key to search for, or NULL for first/last page. - * [in] flags If MDBX_PS_MODIFY is set, visited pages in the DB - * are touched (updated with new page numbers). - * If MDBX_PS_FIRST or MDBX_PS_LAST is set, find first or last - * leaf. - * This is used by mdbx_cursor_first() and mdbx_cursor_last(). - * If MDBX_PS_ROOTONLY set, just fetch root node, no further - * lookups. - * - * Returns 0 on success, non-zero on failure. */ -static int mdbx_page_search(MDBX_cursor *mc, MDBX_val *key, int flags) { - int rc; - pgno_t root; - - /* Make sure the txn is still viable, then find the root from - * the txn's db table and set it as the root of the cursor's stack. */ - if (unlikely(mc->mc_txn->mt_flags & MDBX_TXN_BLOCKED)) { - mdbx_debug("transaction has failed, must abort"); - return MDBX_BAD_TXN; - } - - mdbx_cassert(mc, mc->mc_txn->mt_txnid >= mc->mc_txn->mt_env->me_oldest[0]); - /* Make sure we're using an up-to-date root */ - if (unlikely(*mc->mc_dbflag & DB_STALE)) { - MDBX_cursor mc2; - if (unlikely(TXN_DBI_CHANGED(mc->mc_txn, mc->mc_dbi))) - return MDBX_BAD_DBI; - mdbx_cursor_init(&mc2, mc->mc_txn, MAIN_DBI, NULL); - rc = mdbx_page_search(&mc2, &mc->mc_dbx->md_name, 0); - if (rc) - return rc; - { - MDBX_val data; - int exact = 0; - MDBX_node *leaf = mdbx_node_search(&mc2, &mc->mc_dbx->md_name, &exact); - if (!exact) - return MDBX_NOTFOUND; - if (unlikely((leaf->mn_flags & (F_DUPDATA | F_SUBDATA)) != F_SUBDATA)) - return MDBX_INCOMPATIBLE; /* not a named DB */ - rc = mdbx_node_read(&mc2, leaf, &data); - if (rc) - return rc; - - uint16_t md_flags; - memcpy(&md_flags, ((char *)data.iov_base + offsetof(MDBX_db, md_flags)), - sizeof(uint16_t)); - /* The txn may not know this DBI, or another process may - * have dropped and recreated the DB with other flags. */ - if (unlikely((mc->mc_db->md_flags & PERSISTENT_FLAGS) != md_flags)) - return MDBX_INCOMPATIBLE; - memcpy(mc->mc_db, data.iov_base, sizeof(MDBX_db)); - } - *mc->mc_dbflag &= ~DB_STALE; - } - root = mc->mc_db->md_root; - - if (unlikely(root == P_INVALID)) { /* Tree is empty. */ - mdbx_debug("tree is empty"); - return MDBX_NOTFOUND; - } - - mdbx_cassert(mc, mc->mc_txn->mt_txnid >= mc->mc_txn->mt_env->me_oldest[0]); - mdbx_cassert(mc, root >= NUM_METAS); - if (!mc->mc_pg[0] || mc->mc_pg[0]->mp_pgno != root) - if (unlikely((rc = mdbx_page_get(mc, root, &mc->mc_pg[0], NULL)) != 0)) - return rc; - - mc->mc_snum = 1; - mc->mc_top = 0; - - mdbx_debug("db %d root page %" PRIaPGNO " has flags 0x%X", DDBI(mc), root, - mc->mc_pg[0]->mp_flags); - - if (flags & MDBX_PS_MODIFY) { - if (unlikely(rc = mdbx_page_touch(mc))) - return rc; - } - - if (flags & MDBX_PS_ROOTONLY) - return MDBX_SUCCESS; - - return mdbx_page_search_root(mc, key, flags); -} - -static int mdbx_ovpage_free(MDBX_cursor *mc, MDBX_page *mp) { - MDBX_txn *txn = mc->mc_txn; - pgno_t pg = mp->mp_pgno; - unsigned x = 0, ovpages = mp->mp_pages; - MDBX_env *env = txn->mt_env; - MDBX_PNL sl = txn->mt_spill_pages; - pgno_t pn = pg << 1; - int rc; - - mdbx_debug("free ov page %" PRIaPGNO " (%u)", pg, ovpages); - /* If the page is dirty or on the spill list we just acquired it, - * so we should give it back to our current free list, if any. - * Otherwise put it onto the list of pages we freed in this txn. - * - * Won't create me_reclaimed_pglist: me_last_reclaimed must be inited along - * with it. - * Unsupported in nested txns: They would need to hide the page - * range in ancestor txns' dirty and spilled lists. */ - if (env->me_reclaimed_pglist && !txn->mt_parent && - ((mp->mp_flags & P_DIRTY) || - (sl && (x = mdbx_pnl_search(sl, pn)) <= sl[0] && sl[x] == pn))) { - unsigned i, j; - pgno_t *mop; - MDBX_ID2 *dl, ix, iy; - rc = mdbx_pnl_need(&env->me_reclaimed_pglist, ovpages); - if (unlikely(rc)) - return rc; - if (!(mp->mp_flags & P_DIRTY)) { - /* This page is no longer spilled */ - if (x == sl[0]) - sl[0]--; - else - sl[x] |= 1; - goto release; - } - /* Remove from dirty list */ - dl = txn->mt_rw_dirtylist; - x = dl[0].mid--; - for (ix = dl[x]; ix.mptr != mp; ix = iy) { - if (likely(x > 1)) { - x--; - iy = dl[x]; - dl[x] = ix; - } else { - mdbx_cassert(mc, x > 1); - mdbx_error("not found page 0x%p #%" PRIaPGNO " in the dirtylist", mp, - mp->mp_pgno); - j = ++(dl[0].mid); - dl[j] = ix; /* Unsorted. OK when MDBX_TXN_ERROR. */ - txn->mt_flags |= MDBX_TXN_ERROR; - return MDBX_PROBLEM; - } - } - txn->mt_dirtyroom++; - if (!(env->me_flags & MDBX_WRITEMAP)) - mdbx_dpage_free(env, mp); - release: - /* Insert in me_reclaimed_pglist */ - mop = env->me_reclaimed_pglist; - j = mop[0] + ovpages; - for (i = mop[0]; i && mop[i] < pg; i--) - mop[j--] = mop[i]; - while (j > i) - mop[j--] = pg++; - mop[0] += ovpages; - } else { - rc = mdbx_pnl_append_range(&txn->mt_befree_pages, pg, ovpages); - if (unlikely(rc)) - return rc; - } - mc->mc_db->md_overflow_pages -= ovpages; - return 0; -} - -/* Return the data associated with a given node. - * - * [in] mc The cursor for this operation. - * [in] leaf The node being read. - * [out] data Updated to point to the node's data. - * - * Returns 0 on success, non-zero on failure. */ -static __inline int mdbx_node_read(MDBX_cursor *mc, MDBX_node *leaf, - MDBX_val *data) { - MDBX_page *omp; /* overflow page */ - pgno_t pgno; - int rc; - - mdbx_cassert(mc, mc->mc_txn->mt_txnid >= mc->mc_txn->mt_env->me_oldest[0]); - if (!F_ISSET(leaf->mn_flags, F_BIGDATA)) { - data->iov_len = NODEDSZ(leaf); - data->iov_base = NODEDATA(leaf); - return MDBX_SUCCESS; - } - - /* Read overflow data. */ - data->iov_len = NODEDSZ(leaf); - memcpy(&pgno, NODEDATA(leaf), sizeof(pgno)); - if (unlikely((rc = mdbx_page_get(mc, pgno, &omp, NULL)) != 0)) { - mdbx_debug("read overflow page %" PRIaPGNO " failed", pgno); - return rc; - } - data->iov_base = PAGEDATA(omp); - - return MDBX_SUCCESS; -} - -int mdbx_get(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key, MDBX_val *data) { - MDBX_cursor mc; - MDBX_xcursor mx; - int exact = 0; - DKBUF; - - mdbx_debug("===> get db %u key [%s]", dbi, DKEY(key)); - - if (unlikely(!key || !data || !txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID))) - return MDBX_EINVAL; - - if (unlikely(txn->mt_flags & MDBX_TXN_BLOCKED)) - return MDBX_BAD_TXN; - - mdbx_cursor_init(&mc, txn, dbi, &mx); - return mdbx_cursor_set(&mc, key, data, MDBX_SET, &exact); -} - -/* Find a sibling for a page. - * Replaces the page at the top of the cursor's stack with the specified - * sibling, if one exists. - * - * [in] mc The cursor for this operation. - * [in] move_right Non-zero if the right sibling is requested, - * otherwise the left sibling. - * - * Returns 0 on success, non-zero on failure. */ -static int mdbx_cursor_sibling(MDBX_cursor *mc, int move_right) { - int rc; - MDBX_node *indx; - MDBX_page *mp; - - mdbx_cassert(mc, mc->mc_txn->mt_txnid >= mc->mc_txn->mt_env->me_oldest[0]); - if (unlikely(mc->mc_snum < 2)) { - return MDBX_NOTFOUND; /* root has no siblings */ - } - - mdbx_cursor_pop(mc); - mdbx_debug("parent page is page %" PRIaPGNO ", index %u", - mc->mc_pg[mc->mc_top]->mp_pgno, mc->mc_ki[mc->mc_top]); - - if (move_right - ? (mc->mc_ki[mc->mc_top] + 1u >= NUMKEYS(mc->mc_pg[mc->mc_top])) - : (mc->mc_ki[mc->mc_top] == 0)) { - mdbx_debug("no more keys left, moving to %s sibling", - move_right ? "right" : "left"); - if (unlikely((rc = mdbx_cursor_sibling(mc, move_right)) != MDBX_SUCCESS)) { - /* undo cursor_pop before returning */ - mc->mc_top++; - mc->mc_snum++; - return rc; - } - } else { - if (move_right) - mc->mc_ki[mc->mc_top]++; - else - mc->mc_ki[mc->mc_top]--; - mdbx_debug("just moving to %s index key %u", move_right ? "right" : "left", - mc->mc_ki[mc->mc_top]); - } - mdbx_cassert(mc, IS_BRANCH(mc->mc_pg[mc->mc_top])); - - indx = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]); - if (unlikely((rc = mdbx_page_get(mc, NODEPGNO(indx), &mp, NULL)) != 0)) { - /* mc will be inconsistent if caller does mc_snum++ as above */ - mc->mc_flags &= ~(C_INITIALIZED | C_EOF); - return rc; - } - - mdbx_cursor_push(mc, mp); - if (!move_right) - mc->mc_ki[mc->mc_top] = NUMKEYS(mp) - 1; - - return MDBX_SUCCESS; -} - -/* Move the cursor to the next data item. */ -static int mdbx_cursor_next(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data, - MDBX_cursor_op op) { - MDBX_page *mp; - MDBX_node *leaf; - int rc; - - if ((mc->mc_flags & C_DEL) && op == MDBX_NEXT_DUP) - return MDBX_NOTFOUND; - - if (!(mc->mc_flags & C_INITIALIZED)) - return mdbx_cursor_first(mc, key, data); - - mp = mc->mc_pg[mc->mc_top]; - if (mc->mc_flags & C_EOF) { - if (mc->mc_ki[mc->mc_top] + 1u >= NUMKEYS(mp)) - return MDBX_NOTFOUND; - mc->mc_flags ^= C_EOF; - } - - if (mc->mc_db->md_flags & MDBX_DUPSORT) { - leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]); - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - if (op == MDBX_NEXT || op == MDBX_NEXT_DUP) { - rc = - mdbx_cursor_next(&mc->mc_xcursor->mx_cursor, data, NULL, MDBX_NEXT); - if (op != MDBX_NEXT || rc != MDBX_NOTFOUND) { - if (likely(rc == MDBX_SUCCESS)) - MDBX_GET_KEY(leaf, key); - return rc; - } - } - } else { - mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED | C_EOF); - if (op == MDBX_NEXT_DUP) - return MDBX_NOTFOUND; - } - } - - mdbx_debug("cursor_next: top page is %" PRIaPGNO " in cursor %p", mp->mp_pgno, - (void *)mc); - if (mc->mc_flags & C_DEL) { - mc->mc_flags ^= C_DEL; - goto skip; - } - - if (mc->mc_ki[mc->mc_top] + 1u >= NUMKEYS(mp)) { - mdbx_debug("=====> move to next sibling page"); - if (unlikely((rc = mdbx_cursor_sibling(mc, 1)) != MDBX_SUCCESS)) { - mc->mc_flags |= C_EOF; - return rc; - } - mp = mc->mc_pg[mc->mc_top]; - mdbx_debug("next page is %" PRIaPGNO ", key index %u", mp->mp_pgno, - mc->mc_ki[mc->mc_top]); - } else - mc->mc_ki[mc->mc_top]++; - -skip: - mdbx_debug("==> cursor points to page %" PRIaPGNO - " with %u keys, key index %u", - mp->mp_pgno, NUMKEYS(mp), mc->mc_ki[mc->mc_top]); - - if (IS_LEAF2(mp)) { - key->iov_len = mc->mc_db->md_xsize; - key->iov_base = LEAF2KEY(mp, mc->mc_ki[mc->mc_top], key->iov_len); - return MDBX_SUCCESS; - } - - mdbx_cassert(mc, IS_LEAF(mp)); - leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]); - - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - mdbx_xcursor_init1(mc, leaf); - } - if (data) { - if (unlikely((rc = mdbx_node_read(mc, leaf, data)) != MDBX_SUCCESS)) - return rc; - - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - rc = mdbx_cursor_first(&mc->mc_xcursor->mx_cursor, data, NULL); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - } - } - - MDBX_GET_KEY(leaf, key); - return MDBX_SUCCESS; -} - -/* Move the cursor to the previous data item. */ -static int mdbx_cursor_prev(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data, - MDBX_cursor_op op) { - MDBX_page *mp; - MDBX_node *leaf; - int rc; - - if ((mc->mc_flags & C_DEL) && op == MDBX_PREV_DUP) - return MDBX_NOTFOUND; - - if (!(mc->mc_flags & C_INITIALIZED)) { - rc = mdbx_cursor_last(mc, key, data); - if (unlikely(rc)) - return rc; - mc->mc_ki[mc->mc_top]++; - } - - mp = mc->mc_pg[mc->mc_top]; - if ((mc->mc_db->md_flags & MDBX_DUPSORT) && - mc->mc_ki[mc->mc_top] < NUMKEYS(mp)) { - leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]); - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - if (op == MDBX_PREV || op == MDBX_PREV_DUP) { - rc = - mdbx_cursor_prev(&mc->mc_xcursor->mx_cursor, data, NULL, MDBX_PREV); - if (op != MDBX_PREV || rc != MDBX_NOTFOUND) { - if (likely(rc == MDBX_SUCCESS)) { - MDBX_GET_KEY(leaf, key); - mc->mc_flags &= ~C_EOF; - } - return rc; - } - } - } else { - mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED | C_EOF); - if (op == MDBX_PREV_DUP) - return MDBX_NOTFOUND; - } - } - - mdbx_debug("cursor_prev: top page is %" PRIaPGNO " in cursor %p", mp->mp_pgno, - (void *)mc); - - mc->mc_flags &= ~(C_EOF | C_DEL); - - if (mc->mc_ki[mc->mc_top] == 0) { - mdbx_debug("=====> move to prev sibling page"); - if ((rc = mdbx_cursor_sibling(mc, 0)) != MDBX_SUCCESS) { - return rc; - } - mp = mc->mc_pg[mc->mc_top]; - mc->mc_ki[mc->mc_top] = NUMKEYS(mp) - 1; - mdbx_debug("prev page is %" PRIaPGNO ", key index %u", mp->mp_pgno, - mc->mc_ki[mc->mc_top]); - } else - mc->mc_ki[mc->mc_top]--; - - mdbx_debug("==> cursor points to page %" PRIaPGNO - " with %u keys, key index %u", - mp->mp_pgno, NUMKEYS(mp), mc->mc_ki[mc->mc_top]); - - if (IS_LEAF2(mp)) { - key->iov_len = mc->mc_db->md_xsize; - key->iov_base = LEAF2KEY(mp, mc->mc_ki[mc->mc_top], key->iov_len); - return MDBX_SUCCESS; - } - - mdbx_cassert(mc, IS_LEAF(mp)); - leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]); - - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - mdbx_xcursor_init1(mc, leaf); - } - if (data) { - if (unlikely((rc = mdbx_node_read(mc, leaf, data)) != MDBX_SUCCESS)) - return rc; - - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - rc = mdbx_cursor_last(&mc->mc_xcursor->mx_cursor, data, NULL); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - } - } - - MDBX_GET_KEY(leaf, key); - return MDBX_SUCCESS; -} - -/* Set the cursor on a specific data item. */ -static int mdbx_cursor_set(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data, - MDBX_cursor_op op, int *exactp) { - int rc; - MDBX_page *mp; - MDBX_node *leaf = NULL; - DKBUF; - - mdbx_cassert(mc, mc->mc_txn->mt_txnid >= mc->mc_txn->mt_env->me_oldest[0]); - if ((mc->mc_db->md_flags & MDBX_INTEGERKEY) && - unlikely(key->iov_len != sizeof(uint32_t) && - key->iov_len != sizeof(uint64_t))) { - mdbx_cassert(mc, !"key-size is invalid for MDBX_INTEGERKEY"); - return MDBX_BAD_VALSIZE; - } - - if (mc->mc_xcursor) - mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED | C_EOF); - - /* See if we're already on the right page */ - if (mc->mc_flags & C_INITIALIZED) { - MDBX_val nodekey; - - mp = mc->mc_pg[mc->mc_top]; - if (!NUMKEYS(mp)) { - mc->mc_ki[mc->mc_top] = 0; - return MDBX_NOTFOUND; - } - if (mp->mp_flags & P_LEAF2) { - nodekey.iov_len = mc->mc_db->md_xsize; - nodekey.iov_base = LEAF2KEY(mp, 0, nodekey.iov_len); - } else { - leaf = NODEPTR(mp, 0); - MDBX_GET_KEY2(leaf, nodekey); - } - rc = mc->mc_dbx->md_cmp(key, &nodekey); - if (rc == 0) { - /* Probably happens rarely, but first node on the page - * was the one we wanted. - */ - mc->mc_ki[mc->mc_top] = 0; - if (exactp) - *exactp = 1; - goto set1; - } - if (rc > 0) { - unsigned i; - unsigned nkeys = NUMKEYS(mp); - if (nkeys > 1) { - if (mp->mp_flags & P_LEAF2) { - nodekey.iov_base = LEAF2KEY(mp, nkeys - 1, nodekey.iov_len); - } else { - leaf = NODEPTR(mp, nkeys - 1); - MDBX_GET_KEY2(leaf, nodekey); - } - rc = mc->mc_dbx->md_cmp(key, &nodekey); - if (rc == 0) { - /* last node was the one we wanted */ - mdbx_cassert(mc, nkeys >= 1 && nkeys <= UINT16_MAX + 1); - mc->mc_ki[mc->mc_top] = (indx_t)(nkeys - 1); - if (exactp) - *exactp = 1; - goto set1; - } - if (rc < 0) { - if (mc->mc_ki[mc->mc_top] < NUMKEYS(mp)) { - /* This is definitely the right page, skip search_page */ - if (mp->mp_flags & P_LEAF2) { - nodekey.iov_base = - LEAF2KEY(mp, mc->mc_ki[mc->mc_top], nodekey.iov_len); - } else { - leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]); - MDBX_GET_KEY2(leaf, nodekey); - } - rc = mc->mc_dbx->md_cmp(key, &nodekey); - if (rc == 0) { - /* current node was the one we wanted */ - if (exactp) - *exactp = 1; - goto set1; - } - } - rc = 0; - mc->mc_flags &= ~C_EOF; - goto set2; - } - } - /* If any parents have right-sibs, search. - * Otherwise, there's nothing further. */ - for (i = 0; i < mc->mc_top; i++) - if (mc->mc_ki[i] < NUMKEYS(mc->mc_pg[i]) - 1) - break; - if (i == mc->mc_top) { - /* There are no other pages */ - mdbx_cassert(mc, nkeys <= UINT16_MAX); - mc->mc_ki[mc->mc_top] = (uint16_t)nkeys; - return MDBX_NOTFOUND; - } - } - if (!mc->mc_top) { - /* There are no other pages */ - mc->mc_ki[mc->mc_top] = 0; - if (op == MDBX_SET_RANGE && !exactp) { - rc = 0; - goto set1; - } else - return MDBX_NOTFOUND; - } - } else { - mc->mc_pg[0] = 0; - } - - rc = mdbx_page_search(mc, key, 0); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - - mp = mc->mc_pg[mc->mc_top]; - mdbx_cassert(mc, IS_LEAF(mp)); - -set2: - leaf = mdbx_node_search(mc, key, exactp); - if (exactp != NULL && !*exactp) { - /* MDBX_SET specified and not an exact match. */ - return MDBX_NOTFOUND; - } - - if (leaf == NULL) { - mdbx_debug("===> inexact leaf not found, goto sibling"); - if (unlikely((rc = mdbx_cursor_sibling(mc, 1)) != MDBX_SUCCESS)) { - mc->mc_flags |= C_EOF; - return rc; /* no entries matched */ - } - mp = mc->mc_pg[mc->mc_top]; - mdbx_cassert(mc, IS_LEAF(mp)); - leaf = NODEPTR(mp, 0); - } - -set1: - mc->mc_flags |= C_INITIALIZED; - mc->mc_flags &= ~C_EOF; - - if (IS_LEAF2(mp)) { - if (op == MDBX_SET_RANGE || op == MDBX_SET_KEY) { - key->iov_len = mc->mc_db->md_xsize; - key->iov_base = LEAF2KEY(mp, mc->mc_ki[mc->mc_top], key->iov_len); - } - return MDBX_SUCCESS; - } - - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - mdbx_xcursor_init1(mc, leaf); - } - if (likely(data)) { - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - if (op == MDBX_SET || op == MDBX_SET_KEY || op == MDBX_SET_RANGE) { - rc = mdbx_cursor_first(&mc->mc_xcursor->mx_cursor, data, NULL); - } else { - int ex2, *ex2p; - if (op == MDBX_GET_BOTH) { - ex2p = &ex2; - ex2 = 0; - } else { - ex2p = NULL; - } - rc = mdbx_cursor_set(&mc->mc_xcursor->mx_cursor, data, NULL, - MDBX_SET_RANGE, ex2p); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - } - } else if (op == MDBX_GET_BOTH || op == MDBX_GET_BOTH_RANGE) { - MDBX_val olddata; - if (unlikely((rc = mdbx_node_read(mc, leaf, &olddata)) != MDBX_SUCCESS)) - return rc; - rc = mc->mc_dbx->md_dcmp(data, &olddata); - if (rc) { - if (op == MDBX_GET_BOTH || rc > 0) - return MDBX_NOTFOUND; - rc = 0; - } - *data = olddata; - } else { - if (mc->mc_xcursor) - mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED | C_EOF); - if (unlikely((rc = mdbx_node_read(mc, leaf, data)) != MDBX_SUCCESS)) - return rc; - } - } - - /* The key already matches in all other cases */ - if (op == MDBX_SET_RANGE || op == MDBX_SET_KEY) - MDBX_GET_KEY(leaf, key); - - mdbx_debug("==> cursor placed on key [%s], data [%s]", DKEY(key), DVAL(data)); - return rc; -} - -/* Move the cursor to the first item in the database. */ -static int mdbx_cursor_first(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data) { - int rc; - MDBX_node *leaf; - - if (mc->mc_xcursor) - mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED | C_EOF); - - if (!(mc->mc_flags & C_INITIALIZED) || mc->mc_top) { - rc = mdbx_page_search(mc, NULL, MDBX_PS_FIRST); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - } - mdbx_cassert(mc, IS_LEAF(mc->mc_pg[mc->mc_top])); - - leaf = NODEPTR(mc->mc_pg[mc->mc_top], 0); - mc->mc_flags |= C_INITIALIZED; - mc->mc_flags &= ~C_EOF; - - mc->mc_ki[mc->mc_top] = 0; - - if (IS_LEAF2(mc->mc_pg[mc->mc_top])) { - key->iov_len = mc->mc_db->md_xsize; - key->iov_base = LEAF2KEY(mc->mc_pg[mc->mc_top], 0, key->iov_len); - return MDBX_SUCCESS; - } - - if (likely(data)) { - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - mdbx_cassert(mc, mc->mc_xcursor != nullptr); - mdbx_xcursor_init1(mc, leaf); - rc = mdbx_cursor_first(&mc->mc_xcursor->mx_cursor, data, NULL); - if (unlikely(rc)) - return rc; - } else { - if (unlikely((rc = mdbx_node_read(mc, leaf, data)) != MDBX_SUCCESS)) - return rc; - } - } - MDBX_GET_KEY(leaf, key); - return MDBX_SUCCESS; -} - -/* Move the cursor to the last item in the database. */ -static int mdbx_cursor_last(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data) { - int rc; - MDBX_node *leaf; - - if (mc->mc_xcursor) - mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED | C_EOF); - - if (likely((mc->mc_flags & (C_EOF | C_DEL)) != C_EOF)) { - if (!(mc->mc_flags & C_INITIALIZED) || mc->mc_top) { - rc = mdbx_page_search(mc, NULL, MDBX_PS_LAST); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - } - mdbx_cassert(mc, IS_LEAF(mc->mc_pg[mc->mc_top])); - } - - mc->mc_ki[mc->mc_top] = NUMKEYS(mc->mc_pg[mc->mc_top]) - 1; - mc->mc_flags |= C_INITIALIZED | C_EOF; - leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]); - - if (IS_LEAF2(mc->mc_pg[mc->mc_top])) { - key->iov_len = mc->mc_db->md_xsize; - key->iov_base = - LEAF2KEY(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], key->iov_len); - return MDBX_SUCCESS; - } - - if (likely(data)) { - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - mdbx_cassert(mc, mc->mc_xcursor != nullptr); - mdbx_xcursor_init1(mc, leaf); - rc = mdbx_cursor_last(&mc->mc_xcursor->mx_cursor, data, NULL); - if (unlikely(rc)) - return rc; - } else { - if (unlikely((rc = mdbx_node_read(mc, leaf, data)) != MDBX_SUCCESS)) - return rc; - } - } - - MDBX_GET_KEY(leaf, key); - return MDBX_SUCCESS; -} - -int mdbx_cursor_get(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data, - MDBX_cursor_op op) { - int rc; - int exact = 0; - int (*mfunc)(MDBX_cursor * mc, MDBX_val * key, MDBX_val * data); - - if (unlikely(mc == NULL)) - return MDBX_EINVAL; - - if (unlikely(mc->mc_signature != MDBX_MC_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(mc->mc_txn->mt_flags & MDBX_TXN_BLOCKED)) - return MDBX_BAD_TXN; - - mdbx_cassert(mc, mc->mc_txn->mt_txnid >= mc->mc_txn->mt_env->me_oldest[0]); - switch (op) { - case MDBX_GET_CURRENT: { - if (unlikely(!(mc->mc_flags & C_INITIALIZED))) - return MDBX_EINVAL; - MDBX_page *mp = mc->mc_pg[mc->mc_top]; - unsigned nkeys = NUMKEYS(mp); - if (mc->mc_ki[mc->mc_top] >= nkeys) { - mdbx_cassert(mc, nkeys <= UINT16_MAX); - mc->mc_ki[mc->mc_top] = (uint16_t)nkeys; - return MDBX_NOTFOUND; - } - assert(nkeys > 0); - - rc = MDBX_SUCCESS; - if (IS_LEAF2(mp)) { - key->iov_len = mc->mc_db->md_xsize; - key->iov_base = LEAF2KEY(mp, mc->mc_ki[mc->mc_top], key->iov_len); - } else { - MDBX_node *leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]); - MDBX_GET_KEY(leaf, key); - if (data) { - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - if (unlikely(!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED))) { - mdbx_xcursor_init1(mc, leaf); - rc = mdbx_cursor_first(&mc->mc_xcursor->mx_cursor, data, NULL); - if (unlikely(rc)) - return rc; - } - rc = mdbx_cursor_get(&mc->mc_xcursor->mx_cursor, data, NULL, - MDBX_GET_CURRENT); - } else { - rc = mdbx_node_read(mc, leaf, data); - } - if (unlikely(rc)) - return rc; - } - } - break; - } - case MDBX_GET_BOTH: - case MDBX_GET_BOTH_RANGE: - if (unlikely(data == NULL)) - return MDBX_EINVAL; - if (unlikely(mc->mc_xcursor == NULL)) - return MDBX_INCOMPATIBLE; - /* FALLTHRU */ - case MDBX_SET: - case MDBX_SET_KEY: - case MDBX_SET_RANGE: - if (unlikely(key == NULL)) - return MDBX_EINVAL; - rc = mdbx_cursor_set(mc, key, data, op, - op == MDBX_SET_RANGE ? NULL : &exact); - break; - case MDBX_GET_MULTIPLE: - if (unlikely(data == NULL || !(mc->mc_flags & C_INITIALIZED))) - return MDBX_EINVAL; - if (unlikely(!(mc->mc_db->md_flags & MDBX_DUPFIXED))) - return MDBX_INCOMPATIBLE; - rc = MDBX_SUCCESS; - if (!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED) || - (mc->mc_xcursor->mx_cursor.mc_flags & C_EOF)) - break; - goto fetchm; - case MDBX_NEXT_MULTIPLE: - if (unlikely(data == NULL)) - return MDBX_EINVAL; - if (unlikely(!(mc->mc_db->md_flags & MDBX_DUPFIXED))) - return MDBX_INCOMPATIBLE; - rc = mdbx_cursor_next(mc, key, data, MDBX_NEXT_DUP); - if (rc == MDBX_SUCCESS) { - if (mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED) { - MDBX_cursor *mx; - fetchm: - mx = &mc->mc_xcursor->mx_cursor; - data->iov_len = NUMKEYS(mx->mc_pg[mx->mc_top]) * mx->mc_db->md_xsize; - data->iov_base = PAGEDATA(mx->mc_pg[mx->mc_top]); - mx->mc_ki[mx->mc_top] = NUMKEYS(mx->mc_pg[mx->mc_top]) - 1; - } else { - rc = MDBX_NOTFOUND; - } - } - break; - case MDBX_PREV_MULTIPLE: - if (data == NULL) - return MDBX_EINVAL; - if (!(mc->mc_db->md_flags & MDBX_DUPFIXED)) - return MDBX_INCOMPATIBLE; - rc = MDBX_SUCCESS; - if (!(mc->mc_flags & C_INITIALIZED)) - rc = mdbx_cursor_last(mc, key, data); - if (rc == MDBX_SUCCESS) { - MDBX_cursor *mx = &mc->mc_xcursor->mx_cursor; - if (mx->mc_flags & C_INITIALIZED) { - rc = mdbx_cursor_sibling(mx, 0); - if (rc == MDBX_SUCCESS) - goto fetchm; - } else { - rc = MDBX_NOTFOUND; - } - } - break; - case MDBX_NEXT: - case MDBX_NEXT_DUP: - case MDBX_NEXT_NODUP: - rc = mdbx_cursor_next(mc, key, data, op); - break; - case MDBX_PREV: - case MDBX_PREV_DUP: - case MDBX_PREV_NODUP: - rc = mdbx_cursor_prev(mc, key, data, op); - break; - case MDBX_FIRST: - rc = mdbx_cursor_first(mc, key, data); - break; - case MDBX_FIRST_DUP: - mfunc = mdbx_cursor_first; - mmove: - if (unlikely(data == NULL || !(mc->mc_flags & C_INITIALIZED))) - return MDBX_EINVAL; - if (unlikely(mc->mc_xcursor == NULL)) - return MDBX_INCOMPATIBLE; - if (mc->mc_ki[mc->mc_top] >= NUMKEYS(mc->mc_pg[mc->mc_top])) { - mc->mc_ki[mc->mc_top] = NUMKEYS(mc->mc_pg[mc->mc_top]); - return MDBX_NOTFOUND; - } - { - MDBX_node *leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]); - if (!F_ISSET(leaf->mn_flags, F_DUPDATA)) { - MDBX_GET_KEY(leaf, key); - rc = mdbx_node_read(mc, leaf, data); - break; - } - } - if (unlikely(!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED))) - return MDBX_EINVAL; - rc = mfunc(&mc->mc_xcursor->mx_cursor, data, NULL); - break; - case MDBX_LAST: - rc = mdbx_cursor_last(mc, key, data); - break; - case MDBX_LAST_DUP: - mfunc = mdbx_cursor_last; - goto mmove; - default: - mdbx_debug("unhandled/unimplemented cursor operation %u", op); - return MDBX_EINVAL; - } - - mc->mc_flags &= ~C_DEL; - return rc; -} - -/* Touch all the pages in the cursor stack. Set mc_top. - * Makes sure all the pages are writable, before attempting a write operation. - * [in] mc The cursor to operate on. */ -static int mdbx_cursor_touch(MDBX_cursor *mc) { - int rc = MDBX_SUCCESS; - - if (mc->mc_dbi >= CORE_DBS && !(*mc->mc_dbflag & (DB_DIRTY | DB_DUPDATA))) { - /* Touch DB record of named DB */ - MDBX_cursor mc2; - MDBX_xcursor mcx; - if (TXN_DBI_CHANGED(mc->mc_txn, mc->mc_dbi)) - return MDBX_BAD_DBI; - mdbx_cursor_init(&mc2, mc->mc_txn, MAIN_DBI, &mcx); - rc = mdbx_page_search(&mc2, &mc->mc_dbx->md_name, MDBX_PS_MODIFY); - if (unlikely(rc)) - return rc; - *mc->mc_dbflag |= DB_DIRTY; - } - mc->mc_top = 0; - if (mc->mc_snum) { - do { - rc = mdbx_page_touch(mc); - } while (!rc && ++(mc->mc_top) < mc->mc_snum); - mc->mc_top = mc->mc_snum - 1; - } - return rc; -} - -/* Do not spill pages to disk if txn is getting full, may fail instead */ -#define MDBX_NOSPILL 0x8000 - -int mdbx_cursor_put(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data, - unsigned flags) { - MDBX_env *env; - MDBX_page *fp, *sub_root = NULL; - uint16_t fp_flags; - MDBX_val xdata, *rdata, dkey, olddata; - MDBX_db dummy; - unsigned mcount = 0, dcount = 0, nospill; - size_t nsize; - int rc = MDBX_SUCCESS, rc2; - unsigned nflags; - DKBUF; - - if (unlikely(mc == NULL || key == NULL)) - return MDBX_EINVAL; - - if (unlikely(mc->mc_signature != MDBX_MC_SIGNATURE)) - return MDBX_EBADSIGN; - - env = mc->mc_txn->mt_env; - - /* Check this first so counter will always be zero on any early failures. */ - if (flags & MDBX_MULTIPLE) { - if (unlikely(!F_ISSET(mc->mc_db->md_flags, MDBX_DUPFIXED))) - return MDBX_INCOMPATIBLE; - if (unlikely(data[1].iov_len >= INT_MAX)) - return MDBX_EINVAL; - dcount = (unsigned)data[1].iov_len; - data[1].iov_len = 0; - } - - if (flags & MDBX_RESERVE) { - if (unlikely(mc->mc_db->md_flags & (MDBX_DUPSORT | MDBX_REVERSEDUP))) - return MDBX_INCOMPATIBLE; - data->iov_base = nullptr; - } - - nospill = flags & MDBX_NOSPILL; - flags &= ~MDBX_NOSPILL; - - if (unlikely(mc->mc_txn->mt_flags & (MDBX_TXN_RDONLY | MDBX_TXN_BLOCKED))) - return (mc->mc_txn->mt_flags & MDBX_TXN_RDONLY) ? MDBX_EACCESS - : MDBX_BAD_TXN; - - if (unlikely(key->iov_len > env->me_maxkey_limit)) - return MDBX_BAD_VALSIZE; - - if (unlikely(data->iov_len > ((mc->mc_db->md_flags & MDBX_DUPSORT) - ? env->me_maxkey_limit - : MDBX_MAXDATASIZE))) - return MDBX_BAD_VALSIZE; - - if ((mc->mc_db->md_flags & MDBX_INTEGERKEY) && - unlikely(key->iov_len != sizeof(uint32_t) && - key->iov_len != sizeof(uint64_t))) { - mdbx_cassert(mc, !"key-size is invalid for MDBX_INTEGERKEY"); - return MDBX_BAD_VALSIZE; - } - - if ((mc->mc_db->md_flags & MDBX_INTEGERDUP) && - unlikely(data->iov_len != sizeof(uint32_t) && - data->iov_len != sizeof(uint64_t))) { - mdbx_cassert(mc, !"data-size is invalid MDBX_INTEGERDUP"); - return MDBX_BAD_VALSIZE; - } - - mdbx_debug("==> put db %d key [%s], size %" PRIuPTR - ", data [%s] size %" PRIuPTR, - DDBI(mc), DKEY(key), key ? key->iov_len : 0, - DVAL((flags & MDBX_RESERVE) ? nullptr : data), data->iov_len); - - int dupdata_flag = 0; - if (flags & MDBX_CURRENT) { - /* Опция MDBX_CURRENT означает, что запрошено обновление текущей записи, - * на которой сейчас стоит курсор. Проверяем что переданный ключ совпадает - * со значением в текущей позиции курсора. - * Здесь проще вызвать mdbx_cursor_get(), так как для обслуживания таблиц - * с MDBX_DUPSORT также требуется текущий размер данных. */ - MDBX_val current_key, current_data; - rc = mdbx_cursor_get(mc, ¤t_key, ¤t_data, MDBX_GET_CURRENT); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - if (mc->mc_dbx->md_cmp(key, ¤t_key) != 0) - return MDBX_EKEYMISMATCH; - - if (F_ISSET(mc->mc_db->md_flags, MDBX_DUPSORT)) { - MDBX_node *leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]); - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - mdbx_cassert(mc, - mc->mc_xcursor != NULL && - (mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED)); - /* Если за ключом более одного значения, либо если размер данных - * отличается, то вместо inplace обновления требуется удаление и - * последующая вставка. */ - if (mc->mc_xcursor->mx_db.md_entries > 1 || - current_data.iov_len != data->iov_len) { - rc = mdbx_cursor_del(mc, 0); - if (rc != MDBX_SUCCESS) - return rc; - flags -= MDBX_CURRENT; - } - } - } - } - - if (mc->mc_db->md_root == P_INVALID) { - /* new database, cursor has nothing to point to */ - mc->mc_snum = 0; - mc->mc_top = 0; - mc->mc_flags &= ~C_INITIALIZED; - rc = MDBX_NO_ROOT; - } else if ((flags & MDBX_CURRENT) == 0) { - int exact = 0; - MDBX_val d2; - if (flags & MDBX_APPEND) { - MDBX_val k2; - rc = mdbx_cursor_last(mc, &k2, &d2); - if (rc == 0) { - rc = mc->mc_dbx->md_cmp(key, &k2); - if (rc > 0) { - rc = MDBX_NOTFOUND; - mc->mc_ki[mc->mc_top]++; - } else { - /* new key is <= last key */ - rc = MDBX_EKEYMISMATCH; - } - } - } else { - rc = mdbx_cursor_set(mc, key, &d2, MDBX_SET, &exact); - } - if ((flags & MDBX_NOOVERWRITE) && rc == 0) { - mdbx_debug("duplicate key [%s]", DKEY(key)); - *data = d2; - return MDBX_KEYEXIST; - } - if (rc && unlikely(rc != MDBX_NOTFOUND)) - return rc; - } - - mc->mc_flags &= ~C_DEL; - - /* Cursor is positioned, check for room in the dirty list */ - if (!nospill) { - if (flags & MDBX_MULTIPLE) { - rdata = &xdata; - xdata.iov_len = data->iov_len * dcount; - } else { - rdata = data; - } - if (unlikely(rc2 = mdbx_page_spill(mc, key, rdata))) - return rc2; - } - - if (rc == MDBX_NO_ROOT) { - MDBX_page *np; - /* new database, write a root leaf page */ - mdbx_debug("allocating new root leaf page"); - if (unlikely(rc2 = mdbx_page_new(mc, P_LEAF, 1, &np))) { - return rc2; - } - assert(np->mp_flags & P_LEAF); - mdbx_cursor_push(mc, np); - mc->mc_db->md_root = np->mp_pgno; - mc->mc_db->md_depth++; - *mc->mc_dbflag |= DB_DIRTY; - if ((mc->mc_db->md_flags & (MDBX_DUPSORT | MDBX_DUPFIXED)) == MDBX_DUPFIXED) - np->mp_flags |= P_LEAF2; - mc->mc_flags |= C_INITIALIZED; - } else { - /* make sure all cursor pages are writable */ - rc2 = mdbx_cursor_touch(mc); - if (unlikely(rc2)) - return rc2; - } - - bool insert_key, insert_data, do_sub = false; - insert_key = insert_data = (rc != MDBX_SUCCESS); - if (insert_key) { - /* The key does not exist */ - mdbx_debug("inserting key at index %i", mc->mc_ki[mc->mc_top]); - if ((mc->mc_db->md_flags & MDBX_DUPSORT) && - LEAFSIZE(key, data) > env->me_nodemax) { - /* Too big for a node, insert in sub-DB. Set up an empty - * "old sub-page" for prep_subDB to expand to a full page. */ - fp_flags = P_LEAF | P_DIRTY; - fp = env->me_pbuf; - fp->mp_leaf2_ksize = (uint16_t)data->iov_len; /* used if MDBX_DUPFIXED */ - fp->mp_lower = fp->mp_upper = 0; - olddata.iov_len = PAGEHDRSZ; - goto prep_subDB; - } - } else { - /* there's only a key anyway, so this is a no-op */ - if (IS_LEAF2(mc->mc_pg[mc->mc_top])) { - char *ptr; - unsigned ksize = mc->mc_db->md_xsize; - if (key->iov_len != ksize) - return MDBX_BAD_VALSIZE; - ptr = LEAF2KEY(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], ksize); - memcpy(ptr, key->iov_base, ksize); - fix_parent: - /* if overwriting slot 0 of leaf, need to - * update branch key if there is a parent page */ - if (mc->mc_top && !mc->mc_ki[mc->mc_top]) { - unsigned dtop = 1; - mc->mc_top--; - /* slot 0 is always an empty key, find real slot */ - while (mc->mc_top && !mc->mc_ki[mc->mc_top]) { - mc->mc_top--; - dtop++; - } - if (mc->mc_ki[mc->mc_top]) - rc2 = mdbx_update_key(mc, key); - else - rc2 = MDBX_SUCCESS; - mdbx_cassert(mc, mc->mc_top + dtop < UINT16_MAX); - mc->mc_top += (uint16_t)dtop; - if (rc2) - return rc2; - } - return MDBX_SUCCESS; - } - - more:; - MDBX_node *leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]); - olddata.iov_len = NODEDSZ(leaf); - olddata.iov_base = NODEDATA(leaf); - - /* DB has dups? */ - if (F_ISSET(mc->mc_db->md_flags, MDBX_DUPSORT)) { - /* Prepare (sub-)page/sub-DB to accept the new item, if needed. - * fp: old sub-page or a header faking it. - * mp: new (sub-)page. offset: growth in page size. - * xdata: node data with new page or DB. */ - unsigned i, offset = 0; - MDBX_page *mp = fp = xdata.iov_base = env->me_pbuf; - mp->mp_pgno = mc->mc_pg[mc->mc_top]->mp_pgno; - - /* Was a single item before, must convert now */ - if (!F_ISSET(leaf->mn_flags, F_DUPDATA)) { - - /* does data match? */ - if (!mc->mc_dbx->md_dcmp(data, &olddata)) { - if (unlikely(flags & (MDBX_NODUPDATA | MDBX_APPENDDUP))) - return MDBX_KEYEXIST; - /* overwrite it */ - goto current; - } - - /* Just overwrite the current item */ - if (flags & MDBX_CURRENT) - goto current; - - /* Back up original data item */ - dupdata_flag = 1; - dkey.iov_len = olddata.iov_len; - dkey.iov_base = memcpy(fp + 1, olddata.iov_base, olddata.iov_len); - - /* Make sub-page header for the dup items, with dummy body */ - fp->mp_flags = P_LEAF | P_DIRTY | P_SUBP; - fp->mp_lower = 0; - xdata.iov_len = PAGEHDRSZ + dkey.iov_len + data->iov_len; - if (mc->mc_db->md_flags & MDBX_DUPFIXED) { - fp->mp_flags |= P_LEAF2; - fp->mp_leaf2_ksize = (uint16_t)data->iov_len; - xdata.iov_len += 2 * data->iov_len; /* leave space for 2 more */ - } else { - xdata.iov_len += 2 * (sizeof(indx_t) + NODESIZE) + - (dkey.iov_len & 1) + (data->iov_len & 1); - } - fp->mp_upper = (uint16_t)(xdata.iov_len - PAGEHDRSZ); - olddata.iov_len = xdata.iov_len; /* pretend olddata is fp */ - } else if (leaf->mn_flags & F_SUBDATA) { - /* Data is on sub-DB, just store it */ - flags |= F_DUPDATA | F_SUBDATA; - goto put_sub; - } else { - /* Data is on sub-page */ - fp = olddata.iov_base; - switch (flags) { - default: - if (!(mc->mc_db->md_flags & MDBX_DUPFIXED)) { - offset = EVEN(NODESIZE + sizeof(indx_t) + data->iov_len); - break; - } - offset = fp->mp_leaf2_ksize; - if (SIZELEFT(fp) < offset) { - offset *= 4; /* space for 4 more */ - break; - } - /* FALLTHRU: Big enough MDBX_DUPFIXaED sub-page */ - __fallthrough; - case MDBX_CURRENT | MDBX_NODUPDATA: - case MDBX_CURRENT: - fp->mp_flags |= P_DIRTY; - fp->mp_pgno = mp->mp_pgno; - mc->mc_xcursor->mx_cursor.mc_pg[0] = fp; - flags |= F_DUPDATA; - goto put_sub; - } - xdata.iov_len = olddata.iov_len + offset; - } - - fp_flags = fp->mp_flags; - if (NODESIZE + NODEKSZ(leaf) + xdata.iov_len > env->me_nodemax) { - /* Too big for a sub-page, convert to sub-DB */ - fp_flags &= ~P_SUBP; - prep_subDB: - dummy.md_xsize = 0; - dummy.md_flags = 0; - if (mc->mc_db->md_flags & MDBX_DUPFIXED) { - fp_flags |= P_LEAF2; - dummy.md_xsize = fp->mp_leaf2_ksize; - dummy.md_flags = MDBX_DUPFIXED; - if (mc->mc_db->md_flags & MDBX_INTEGERDUP) - dummy.md_flags |= MDBX_INTEGERKEY; - } - dummy.md_depth = 1; - dummy.md_branch_pages = 0; - dummy.md_leaf_pages = 1; - dummy.md_overflow_pages = 0; - dummy.md_entries = NUMKEYS(fp); - xdata.iov_len = sizeof(MDBX_db); - xdata.iov_base = &dummy; - if ((rc = mdbx_page_alloc(mc, 1, &mp, MDBX_ALLOC_ALL))) - return rc; - mdbx_cassert(mc, env->me_psize > olddata.iov_len); - offset = env->me_psize - (unsigned)olddata.iov_len; - flags |= F_DUPDATA | F_SUBDATA; - dummy.md_root = mp->mp_pgno; - sub_root = mp; - } - if (mp != fp) { - mp->mp_flags = fp_flags | P_DIRTY; - mp->mp_leaf2_ksize = fp->mp_leaf2_ksize; - mp->mp_lower = fp->mp_lower; - mdbx_cassert(mc, fp->mp_upper + offset <= UINT16_MAX); - mp->mp_upper = (indx_t)(fp->mp_upper + offset); - if (fp_flags & P_LEAF2) { - memcpy(PAGEDATA(mp), PAGEDATA(fp), NUMKEYS(fp) * fp->mp_leaf2_ksize); - } else { - memcpy((char *)mp + mp->mp_upper + PAGEHDRSZ, - (char *)fp + fp->mp_upper + PAGEHDRSZ, - olddata.iov_len - fp->mp_upper - PAGEHDRSZ); - for (i = 0; i < NUMKEYS(fp); i++) { - mdbx_cassert(mc, fp->mp_ptrs[i] + offset <= UINT16_MAX); - mp->mp_ptrs[i] = (indx_t)(fp->mp_ptrs[i] + offset); - } - } - } - - rdata = &xdata; - flags |= F_DUPDATA; - do_sub = true; - if (!insert_key) - mdbx_node_del(mc, 0); - goto new_sub; - } - current: - /* MDBX passes F_SUBDATA in 'flags' to write a DB record */ - if (unlikely((leaf->mn_flags ^ flags) & F_SUBDATA)) - return MDBX_INCOMPATIBLE; - /* overflow page overwrites need special handling */ - if (F_ISSET(leaf->mn_flags, F_BIGDATA)) { - MDBX_page *omp; - pgno_t pg; - int level, ovpages, dpages = OVPAGES(env, data->iov_len); - - memcpy(&pg, olddata.iov_base, sizeof(pg)); - if (unlikely((rc2 = mdbx_page_get(mc, pg, &omp, &level)) != 0)) - return rc2; - ovpages = omp->mp_pages; - - /* Is the ov page large enough? */ - if (ovpages >= dpages) { - if (!(omp->mp_flags & P_DIRTY) && - (level || (env->me_flags & MDBX_WRITEMAP))) { - rc = mdbx_page_unspill(mc->mc_txn, omp, &omp); - if (unlikely(rc)) - return rc; - level = 0; /* dirty in this txn or clean */ - } - /* Is it dirty? */ - if (omp->mp_flags & P_DIRTY) { - /* yes, overwrite it. Note in this case we don't - * bother to try shrinking the page if the new data - * is smaller than the overflow threshold. */ - if (unlikely(level > 1)) { - /* It is writable only in a parent txn */ - MDBX_page *np = mdbx_page_malloc(mc->mc_txn, ovpages); - MDBX_ID2 id2; - if (unlikely(!np)) - return MDBX_ENOMEM; - id2.mid = pg; - id2.mptr = np; - /* Note - this page is already counted in parent's dirtyroom */ - rc2 = mdbx_mid2l_insert(mc->mc_txn->mt_rw_dirtylist, &id2); - mdbx_cassert(mc, rc2 == 0); - - /* Currently we make the page look as with put() in the - * parent txn, in case the user peeks at MDBX_RESERVEd - * or unused parts. Some users treat ovpages specially. */ - const size_t whole = pgno2bytes(env, ovpages); - /* Skip the part where MDBX will put *data. - * Copy end of page, adjusting alignment so - * compiler may copy words instead of bytes. */ - const size_t off = - (PAGEHDRSZ + data->iov_len) & -(intptr_t)sizeof(size_t); - memcpy((size_t *)((char *)np + off), (size_t *)((char *)omp + off), - whole - off); - memcpy(np, omp, PAGEHDRSZ); /* Copy header of page */ - omp = np; - } - SETDSZ(leaf, data->iov_len); - if (F_ISSET(flags, MDBX_RESERVE)) - data->iov_base = PAGEDATA(omp); - else - memcpy(PAGEDATA(omp), data->iov_base, data->iov_len); - return MDBX_SUCCESS; - } - } - if ((rc2 = mdbx_ovpage_free(mc, omp)) != MDBX_SUCCESS) - return rc2; - } else if (data->iov_len == olddata.iov_len) { - assert(EVEN(key->iov_len) == EVEN(leaf->mn_ksize)); - /* same size, just replace it. Note that we could - * also reuse this node if the new data is smaller, - * but instead we opt to shrink the node in that case. */ - if (F_ISSET(flags, MDBX_RESERVE)) - data->iov_base = olddata.iov_base; - else if (!(mc->mc_flags & C_SUB)) - memcpy(olddata.iov_base, data->iov_base, data->iov_len); - else { - mdbx_cassert(mc, NUMKEYS(mc->mc_pg[mc->mc_top]) == 1); - mdbx_cassert(mc, mc->mc_pg[mc->mc_top]->mp_upper == - mc->mc_pg[mc->mc_top]->mp_lower); - mdbx_cassert(mc, IS_LEAF(mc->mc_pg[mc->mc_top]) && - !IS_LEAF2(mc->mc_pg[mc->mc_top])); - mdbx_cassert(mc, NODEDSZ(leaf) == 0); - mdbx_cassert(mc, leaf->mn_flags == 0); - mdbx_cassert(mc, key->iov_len < UINT16_MAX); - leaf->mn_ksize = (uint16_t)key->iov_len; - memcpy(NODEKEY(leaf), key->iov_base, key->iov_len); - assert((char *)NODEDATA(leaf) + NODEDSZ(leaf) < - (char *)(mc->mc_pg[mc->mc_top]) + env->me_psize); - goto fix_parent; - } - return MDBX_SUCCESS; - } - mdbx_node_del(mc, 0); - } - - rdata = data; - -new_sub: - nflags = flags & NODE_ADD_FLAGS; - nsize = IS_LEAF2(mc->mc_pg[mc->mc_top]) ? key->iov_len - : mdbx_leaf_size(env, key, rdata); - if (SIZELEFT(mc->mc_pg[mc->mc_top]) < nsize) { - if ((flags & (F_DUPDATA | F_SUBDATA)) == F_DUPDATA) - nflags &= ~MDBX_APPEND; /* sub-page may need room to grow */ - if (!insert_key) - nflags |= MDBX_SPLIT_REPLACE; - rc = mdbx_page_split(mc, key, rdata, P_INVALID, nflags); - } else { - /* There is room already in this leaf page. */ - rc = mdbx_node_add(mc, mc->mc_ki[mc->mc_top], key, rdata, 0, nflags); - if (likely(rc == 0)) { - /* Adjust other cursors pointing to mp */ - MDBX_cursor *m2, *m3; - MDBX_dbi dbi = mc->mc_dbi; - unsigned i = mc->mc_top; - MDBX_page *mp = mc->mc_pg[i]; - - for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2 = m2->mc_next) { - if (mc->mc_flags & C_SUB) - m3 = &m2->mc_xcursor->mx_cursor; - else - m3 = m2; - if (m3 == mc || m3->mc_snum < mc->mc_snum || m3->mc_pg[i] != mp) - continue; - if (m3->mc_ki[i] >= mc->mc_ki[i] && insert_key) { - m3->mc_ki[i]++; - } - if (XCURSOR_INITED(m3)) - XCURSOR_REFRESH(m3, mp, m3->mc_ki[i]); - } - } - } - - if (likely(rc == MDBX_SUCCESS)) { - /* Now store the actual data in the child DB. Note that we're - * storing the user data in the keys field, so there are strict - * size limits on dupdata. The actual data fields of the child - * DB are all zero size. */ - if (do_sub) { - int xflags; - size_t ecount; - put_sub: - xdata.iov_len = 0; - xdata.iov_base = ""; - MDBX_node *leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]); - if (flags & MDBX_CURRENT) { - xflags = (flags & MDBX_NODUPDATA) - ? MDBX_CURRENT | MDBX_NOOVERWRITE | MDBX_NOSPILL - : MDBX_CURRENT | MDBX_NOSPILL; - } else { - mdbx_xcursor_init1(mc, leaf); - xflags = (flags & MDBX_NODUPDATA) ? MDBX_NOOVERWRITE | MDBX_NOSPILL - : MDBX_NOSPILL; - } - if (sub_root) - mc->mc_xcursor->mx_cursor.mc_pg[0] = sub_root; - /* converted, write the original data first */ - if (dupdata_flag) { - rc = mdbx_cursor_put(&mc->mc_xcursor->mx_cursor, &dkey, &xdata, xflags); - if (unlikely(rc)) - goto bad_sub; - /* we've done our job */ - dkey.iov_len = 0; - } - if (!(leaf->mn_flags & F_SUBDATA) || sub_root) { - /* Adjust other cursors pointing to mp */ - MDBX_cursor *m2; - MDBX_xcursor *mx = mc->mc_xcursor; - unsigned i = mc->mc_top; - MDBX_page *mp = mc->mc_pg[i]; - int nkeys = NUMKEYS(mp); - - for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2 = m2->mc_next) { - if (m2 == mc || m2->mc_snum < mc->mc_snum) - continue; - if (!(m2->mc_flags & C_INITIALIZED)) - continue; - if (m2->mc_pg[i] == mp) { - if (m2->mc_ki[i] == mc->mc_ki[i]) { - mdbx_xcursor_init2(m2, mx, dupdata_flag); - } else if (!insert_key && m2->mc_ki[i] < nkeys) { - XCURSOR_REFRESH(m2, mp, m2->mc_ki[i]); - } - } - } - } - mdbx_cassert(mc, mc->mc_xcursor->mx_db.md_entries < SIZE_MAX); - ecount = (size_t)mc->mc_xcursor->mx_db.md_entries; - if (flags & MDBX_APPENDDUP) - xflags |= MDBX_APPEND; - rc = mdbx_cursor_put(&mc->mc_xcursor->mx_cursor, data, &xdata, xflags); - if (flags & F_SUBDATA) { - void *db = NODEDATA(leaf); - memcpy(db, &mc->mc_xcursor->mx_db, sizeof(MDBX_db)); - } - insert_data = (ecount != (size_t)mc->mc_xcursor->mx_db.md_entries); - } - /* Increment count unless we just replaced an existing item. */ - if (insert_data) - mc->mc_db->md_entries++; - if (insert_key) { - /* Invalidate txn if we created an empty sub-DB */ - if (unlikely(rc)) - goto bad_sub; - /* If we succeeded and the key didn't exist before, - * make sure the cursor is marked valid. */ - mc->mc_flags |= C_INITIALIZED; - } - if (flags & MDBX_MULTIPLE) { - if (!rc) { - mcount++; - /* let caller know how many succeeded, if any */ - data[1].iov_len = mcount; - if (mcount < dcount) { - data[0].iov_base = (char *)data[0].iov_base + data[0].iov_len; - insert_key = insert_data = false; - goto more; - } - } - } - return rc; - bad_sub: - if (unlikely(rc == MDBX_KEYEXIST)) - mdbx_error("unexpected %s", "MDBX_KEYEXIST"); - /* should not happen, we deleted that item */ - rc = MDBX_PROBLEM; - } - mc->mc_txn->mt_flags |= MDBX_TXN_ERROR; - return rc; -} - -int mdbx_cursor_del(MDBX_cursor *mc, unsigned flags) { - MDBX_node *leaf; - MDBX_page *mp; - int rc; - - if (unlikely(!mc)) - return MDBX_EINVAL; - - if (unlikely(mc->mc_signature != MDBX_MC_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(mc->mc_txn->mt_flags & (MDBX_TXN_RDONLY | MDBX_TXN_BLOCKED))) - return (mc->mc_txn->mt_flags & MDBX_TXN_RDONLY) ? MDBX_EACCESS - : MDBX_BAD_TXN; - - if (unlikely(!(mc->mc_flags & C_INITIALIZED))) - return MDBX_EINVAL; - - if (unlikely(mc->mc_ki[mc->mc_top] >= NUMKEYS(mc->mc_pg[mc->mc_top]))) - return MDBX_NOTFOUND; - - if (unlikely(!(flags & MDBX_NOSPILL) && - (rc = mdbx_page_spill(mc, NULL, NULL)))) - return rc; - - rc = mdbx_cursor_touch(mc); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - - mp = mc->mc_pg[mc->mc_top]; - if (IS_LEAF2(mp)) - goto del_key; - leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]); - - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - if (flags & MDBX_NODUPDATA) { - /* mdbx_cursor_del0() will subtract the final entry */ - mc->mc_db->md_entries -= mc->mc_xcursor->mx_db.md_entries - 1; - mc->mc_xcursor->mx_cursor.mc_flags &= ~C_INITIALIZED; - } else { - if (!F_ISSET(leaf->mn_flags, F_SUBDATA)) { - mc->mc_xcursor->mx_cursor.mc_pg[0] = NODEDATA(leaf); - } - rc = mdbx_cursor_del(&mc->mc_xcursor->mx_cursor, MDBX_NOSPILL); - if (unlikely(rc)) - return rc; - /* If sub-DB still has entries, we're done */ - if (mc->mc_xcursor->mx_db.md_entries) { - if (leaf->mn_flags & F_SUBDATA) { - /* update subDB info */ - void *db = NODEDATA(leaf); - memcpy(db, &mc->mc_xcursor->mx_db, sizeof(MDBX_db)); - } else { - MDBX_cursor *m2; - /* shrink fake page */ - mdbx_node_shrink(mp, mc->mc_ki[mc->mc_top]); - leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]); - mc->mc_xcursor->mx_cursor.mc_pg[0] = NODEDATA(leaf); - /* fix other sub-DB cursors pointed at fake pages on this page */ - for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2 = m2->mc_next) { - if (m2 == mc || m2->mc_snum < mc->mc_snum) - continue; - if (!(m2->mc_flags & C_INITIALIZED)) - continue; - if (m2->mc_pg[mc->mc_top] == mp) { - MDBX_node *n2 = leaf; - if (m2->mc_ki[mc->mc_top] >= NUMKEYS(mp)) - continue; - if (m2->mc_ki[mc->mc_top] != mc->mc_ki[mc->mc_top]) { - n2 = NODEPTR(mp, m2->mc_ki[mc->mc_top]); - if (n2->mn_flags & F_SUBDATA) - continue; - } - m2->mc_xcursor->mx_cursor.mc_pg[0] = NODEDATA(n2); - } - } - } - mc->mc_db->md_entries--; - return rc; - } else { - mc->mc_xcursor->mx_cursor.mc_flags &= ~C_INITIALIZED; - } - /* otherwise fall thru and delete the sub-DB */ - } - - if (leaf->mn_flags & F_SUBDATA) { - /* add all the child DB's pages to the free list */ - rc = mdbx_drop0(&mc->mc_xcursor->mx_cursor, 0); - if (unlikely(rc)) - goto fail; - } - } - /* MDBX passes F_SUBDATA in 'flags' to delete a DB record */ - else if (unlikely((leaf->mn_flags ^ flags) & F_SUBDATA)) { - rc = MDBX_INCOMPATIBLE; - goto fail; - } - - /* add overflow pages to free list */ - if (F_ISSET(leaf->mn_flags, F_BIGDATA)) { - MDBX_page *omp; - pgno_t pg; - - memcpy(&pg, NODEDATA(leaf), sizeof(pg)); - if (unlikely((rc = mdbx_page_get(mc, pg, &omp, NULL)) || - (rc = mdbx_ovpage_free(mc, omp)))) - goto fail; - } - -del_key: - return mdbx_cursor_del0(mc); - -fail: - mc->mc_txn->mt_flags |= MDBX_TXN_ERROR; - return rc; -} - -/* Allocate and initialize new pages for a database. - * Set MDBX_TXN_ERROR on failure. - * - * [in] mc a cursor on the database being added to. - * [in] flags flags defining what type of page is being allocated. - * [in] num the number of pages to allocate. This is usually 1, - * unless allocating overflow pages for a large record. - * [out] mp Address of a page, or NULL on failure. - * - * Returns 0 on success, non-zero on failure. */ -static int mdbx_page_new(MDBX_cursor *mc, unsigned flags, unsigned num, - MDBX_page **mp) { - MDBX_page *np; - int rc; - - if (unlikely((rc = mdbx_page_alloc(mc, num, &np, MDBX_ALLOC_ALL)))) - return rc; - mdbx_debug("allocated new page #%" PRIaPGNO ", size %u", np->mp_pgno, - mc->mc_txn->mt_env->me_psize); - np->mp_flags = (uint16_t)(flags | P_DIRTY); - np->mp_lower = 0; - np->mp_upper = (indx_t)(mc->mc_txn->mt_env->me_psize - PAGEHDRSZ); - - if (IS_BRANCH(np)) - mc->mc_db->md_branch_pages++; - else if (IS_LEAF(np)) - mc->mc_db->md_leaf_pages++; - else if (IS_OVERFLOW(np)) { - mc->mc_db->md_overflow_pages += num; - np->mp_pages = num; - } - *mp = np; - - return MDBX_SUCCESS; -} - -/* Calculate the size of a leaf node. - * - * The size depends on the environment's page size; if a data item - * is too large it will be put onto an overflow page and the node - * size will only include the key and not the data. Sizes are always - * rounded up to an even number of bytes, to guarantee 2-byte alignment - * of the MDBX_node headers. - * - * [in] env The environment handle. - * [in] key The key for the node. - * [in] data The data for the node. - * - * Returns The number of bytes needed to store the node. */ -static __inline size_t mdbx_leaf_size(MDBX_env *env, MDBX_val *key, - MDBX_val *data) { - size_t sz; - - sz = LEAFSIZE(key, data); - if (sz > env->me_nodemax) { - /* put on overflow page */ - sz -= data->iov_len - sizeof(pgno_t); - } - - return EVEN(sz + sizeof(indx_t)); -} - -/* Calculate the size of a branch node. - * - * The size should depend on the environment's page size but since - * we currently don't support spilling large keys onto overflow - * pages, it's simply the size of the MDBX_node header plus the - * size of the key. Sizes are always rounded up to an even number - * of bytes, to guarantee 2-byte alignment of the MDBX_node headers. - * - * [in] env The environment handle. - * [in] key The key for the node. - * - * Returns The number of bytes needed to store the node. */ -static __inline size_t mdbx_branch_size(MDBX_env *env, MDBX_val *key) { - size_t sz; - - sz = INDXSIZE(key); - if (unlikely(sz > env->me_nodemax)) { - /* put on overflow page */ - /* not implemented */ - mdbx_assert_fail(env, "INDXSIZE(key) <= env->me_nodemax", __FUNCTION__, - __LINE__); - sz -= key->iov_len - sizeof(pgno_t); - } - - return sz + sizeof(indx_t); -} - -/* Add a node to the page pointed to by the cursor. - * Set MDBX_TXN_ERROR on failure. - * - * [in] mc The cursor for this operation. - * [in] indx The index on the page where the new node should be added. - * [in] key The key for the new node. - * [in] data The data for the new node, if any. - * [in] pgno The page number, if adding a branch node. - * [in] flags Flags for the node. - * - * Returns 0 on success, non-zero on failure. Possible errors are: - * - * MDBX_ENOMEM - failed to allocate overflow pages for the node. - * MDBX_PAGE_FULL - there is insufficient room in the page. This error - * should never happen since all callers already calculate - * the page's free space before calling this function. */ -static int mdbx_node_add(MDBX_cursor *mc, unsigned indx, MDBX_val *key, - MDBX_val *data, pgno_t pgno, unsigned flags) { - unsigned i; - size_t node_size = NODESIZE; - intptr_t room; - MDBX_node *node; - MDBX_page *mp = mc->mc_pg[mc->mc_top]; - MDBX_page *ofp = NULL; /* overflow page */ - void *ndata; - DKBUF; - - mdbx_cassert(mc, mp->mp_upper >= mp->mp_lower); - - mdbx_debug("add to %s %spage %" PRIaPGNO " index %i, data size %" PRIuPTR - " key size %" PRIuPTR " [%s]", - IS_LEAF(mp) ? "leaf" : "branch", IS_SUBP(mp) ? "sub-" : "", - mp->mp_pgno, indx, data ? data->iov_len : 0, - key ? key->iov_len : 0, DKEY(key)); - - if (IS_LEAF2(mp)) { - mdbx_cassert(mc, key); - /* Move higher keys up one slot. */ - const int ksize = mc->mc_db->md_xsize; - char *const ptr = LEAF2KEY(mp, indx, ksize); - const int diff = NUMKEYS(mp) - indx; - if (diff > 0) - memmove(ptr + ksize, ptr, diff * ksize); - /* insert new key */ - memcpy(ptr, key->iov_base, ksize); - - /* Just using these for counting */ - mdbx_cassert(mc, UINT16_MAX - mp->mp_lower >= (int)sizeof(indx_t)); - mp->mp_lower += sizeof(indx_t); - mdbx_cassert(mc, mp->mp_upper >= ksize - sizeof(indx_t)); - mp->mp_upper -= (indx_t)(ksize - sizeof(indx_t)); - return MDBX_SUCCESS; - } - - room = (intptr_t)SIZELEFT(mp) - (intptr_t)sizeof(indx_t); - if (key != NULL) - node_size += key->iov_len; - if (IS_LEAF(mp)) { - mdbx_cassert(mc, key && data); - if (unlikely(F_ISSET(flags, F_BIGDATA))) { - /* Data already on overflow page. */ - node_size += sizeof(pgno_t); - } else if (unlikely(node_size + data->iov_len > - mc->mc_txn->mt_env->me_nodemax)) { - pgno_t ovpages = OVPAGES(mc->mc_txn->mt_env, data->iov_len); - int rc; - /* Put data on overflow page. */ - mdbx_debug("data size is %" PRIuPTR ", node would be %" PRIuPTR - ", put data on overflow page", - data->iov_len, node_size + data->iov_len); - node_size = EVEN(node_size + sizeof(pgno_t)); - if ((intptr_t)node_size > room) - goto full; - if ((rc = mdbx_page_new(mc, P_OVERFLOW, ovpages, &ofp))) - return rc; - mdbx_debug("allocated overflow page %" PRIaPGNO "", ofp->mp_pgno); - flags |= F_BIGDATA; - goto update; - } else { - node_size += data->iov_len; - } - } - node_size = EVEN(node_size); - if (unlikely((intptr_t)node_size > room)) - goto full; - -update: - /* Move higher pointers up one slot. */ - for (i = NUMKEYS(mp); i > indx; i--) - mp->mp_ptrs[i] = mp->mp_ptrs[i - 1]; - - /* Adjust free space offsets. */ - size_t ofs = mp->mp_upper - node_size; - mdbx_cassert(mc, ofs >= mp->mp_lower + sizeof(indx_t)); - mdbx_cassert(mc, ofs <= UINT16_MAX); - mp->mp_ptrs[indx] = (uint16_t)ofs; - mp->mp_upper = (uint16_t)ofs; - mp->mp_lower += sizeof(indx_t); - - /* Write the node data. */ - node = NODEPTR(mp, indx); - node->mn_ksize = (key == NULL) ? 0 : (uint16_t)key->iov_len; - node->mn_flags = (uint16_t)flags; - if (IS_LEAF(mp)) - SETDSZ(node, data->iov_len); - else - SETPGNO(node, pgno); - - if (key) - memcpy(NODEKEY(node), key->iov_base, key->iov_len); - - if (IS_LEAF(mp)) { - ndata = NODEDATA(node); - if (unlikely(ofp == NULL)) { - if (unlikely(F_ISSET(flags, F_BIGDATA))) - memcpy(ndata, data->iov_base, sizeof(pgno_t)); - else if (F_ISSET(flags, MDBX_RESERVE)) - data->iov_base = ndata; - else if (likely(ndata != data->iov_base)) - memcpy(ndata, data->iov_base, data->iov_len); - } else { - memcpy(ndata, &ofp->mp_pgno, sizeof(pgno_t)); - ndata = PAGEDATA(ofp); - if (F_ISSET(flags, MDBX_RESERVE)) - data->iov_base = ndata; - else if (likely(ndata != data->iov_base)) - memcpy(ndata, data->iov_base, data->iov_len); - } - } - - return MDBX_SUCCESS; - -full: - mdbx_debug("not enough room in page %" PRIaPGNO ", got %u ptrs", mp->mp_pgno, - NUMKEYS(mp)); - mdbx_debug("upper-lower = %u - %u = %" PRIiPTR "", mp->mp_upper, mp->mp_lower, - room); - mdbx_debug("node size = %" PRIuPTR "", node_size); - mc->mc_txn->mt_flags |= MDBX_TXN_ERROR; - return MDBX_PAGE_FULL; -} - -/* Delete the specified node from a page. - * [in] mc Cursor pointing to the node to delete. - * [in] ksize The size of a node. Only used if the page is - * part of a MDBX_DUPFIXED database. */ -static void mdbx_node_del(MDBX_cursor *mc, size_t ksize) { - MDBX_page *mp = mc->mc_pg[mc->mc_top]; - indx_t indx = mc->mc_ki[mc->mc_top]; - indx_t i, j, numkeys, ptr; - MDBX_node *node; - char *base; - - mdbx_debug("delete node %u on %s page %" PRIaPGNO "", indx, - IS_LEAF(mp) ? "leaf" : "branch", mp->mp_pgno); - numkeys = NUMKEYS(mp); - mdbx_cassert(mc, indx < numkeys); - - if (IS_LEAF2(mp)) { - mdbx_cassert(mc, ksize >= sizeof(indx_t)); - unsigned diff = numkeys - 1 - indx; - base = LEAF2KEY(mp, indx, ksize); - if (diff) - memmove(base, base + ksize, diff * ksize); - mdbx_cassert(mc, mp->mp_lower >= sizeof(indx_t)); - mp->mp_lower -= sizeof(indx_t); - mdbx_cassert(mc, - (size_t)UINT16_MAX - mp->mp_upper >= ksize - sizeof(indx_t)); - mp->mp_upper += (indx_t)(ksize - sizeof(indx_t)); - return; - } - - node = NODEPTR(mp, indx); - size_t sz = NODESIZE + node->mn_ksize; - if (IS_LEAF(mp)) { - if (F_ISSET(node->mn_flags, F_BIGDATA)) - sz += sizeof(pgno_t); - else - sz += NODEDSZ(node); - } - sz = EVEN(sz); - - ptr = mp->mp_ptrs[indx]; - for (i = j = 0; i < numkeys; i++) { - if (i != indx) { - mp->mp_ptrs[j] = mp->mp_ptrs[i]; - if (mp->mp_ptrs[i] < ptr) { - mdbx_cassert(mc, (size_t)UINT16_MAX - mp->mp_ptrs[j] >= sz); - mp->mp_ptrs[j] += (indx_t)sz; - } - j++; - } - } - - base = (char *)mp + mp->mp_upper + PAGEHDRSZ; - memmove(base + sz, base, ptr - mp->mp_upper); - - mdbx_cassert(mc, mp->mp_lower >= sizeof(indx_t)); - mp->mp_lower -= sizeof(indx_t); - mdbx_cassert(mc, (size_t)UINT16_MAX - mp->mp_upper >= sz); - mp->mp_upper += (indx_t)sz; -} - -/* Compact the main page after deleting a node on a subpage. - * [in] mp The main page to operate on. - * [in] indx The index of the subpage on the main page. */ -static void mdbx_node_shrink(MDBX_page *mp, unsigned indx) { - MDBX_node *node; - MDBX_page *sp, *xp; - char *base; - size_t nsize, delta, len, ptr; - int i; - - node = NODEPTR(mp, indx); - sp = (MDBX_page *)NODEDATA(node); - delta = SIZELEFT(sp); - nsize = NODEDSZ(node) - delta; - - /* Prepare to shift upward, set len = length(subpage part to shift) */ - if (IS_LEAF2(sp)) { - len = nsize; - if (nsize & 1) - return; /* do not make the node uneven-sized */ - } else { - xp = (MDBX_page *)((char *)sp + delta); /* destination subpage */ - for (i = NUMKEYS(sp); --i >= 0;) { - assert(sp->mp_ptrs[i] >= delta); - xp->mp_ptrs[i] = (indx_t)(sp->mp_ptrs[i] - delta); - } - len = PAGEHDRSZ; - } - sp->mp_upper = sp->mp_lower; - sp->mp_pgno = mp->mp_pgno; - SETDSZ(node, nsize); - - /* Shift <lower nodes...initial part of subpage> upward */ - base = (char *)mp + mp->mp_upper + PAGEHDRSZ; - memmove(base + delta, base, (char *)sp + len - base); - - ptr = mp->mp_ptrs[indx]; - for (i = NUMKEYS(mp); --i >= 0;) { - if (mp->mp_ptrs[i] <= ptr) { - assert((size_t)UINT16_MAX - mp->mp_ptrs[i] >= delta); - mp->mp_ptrs[i] += (indx_t)delta; - } - } - assert((size_t)UINT16_MAX - mp->mp_upper >= delta); - mp->mp_upper += (indx_t)delta; -} - -/* Initial setup of a sorted-dups cursor. - * - * Sorted duplicates are implemented as a sub-database for the given key. - * The duplicate data items are actually keys of the sub-database. - * Operations on the duplicate data items are performed using a sub-cursor - * initialized when the sub-database is first accessed. This function does - * the preliminary setup of the sub-cursor, filling in the fields that - * depend only on the parent DB. - * - * [in] mc The main cursor whose sorted-dups cursor is to be initialized. */ -static void mdbx_xcursor_init0(MDBX_cursor *mc) { - MDBX_xcursor *mx = mc->mc_xcursor; - - mx->mx_cursor.mc_xcursor = NULL; - mx->mx_cursor.mc_txn = mc->mc_txn; - mx->mx_cursor.mc_db = &mx->mx_db; - mx->mx_cursor.mc_dbx = &mx->mx_dbx; - mx->mx_cursor.mc_dbi = mc->mc_dbi; - mx->mx_cursor.mc_dbflag = &mx->mx_dbflag; - mx->mx_cursor.mc_snum = 0; - mx->mx_cursor.mc_top = 0; - mx->mx_cursor.mc_flags = C_SUB; - mx->mx_dbx.md_name.iov_len = 0; - mx->mx_dbx.md_name.iov_base = NULL; - mx->mx_dbx.md_cmp = mc->mc_dbx->md_dcmp; - mx->mx_dbx.md_dcmp = NULL; -} - -/* Final setup of a sorted-dups cursor. - * Sets up the fields that depend on the data from the main cursor. - * [in] mc The main cursor whose sorted-dups cursor is to be initialized. - * [in] node The data containing the MDBX_db record for the sorted-dup database. - */ -static void mdbx_xcursor_init1(MDBX_cursor *mc, MDBX_node *node) { - MDBX_xcursor *mx = mc->mc_xcursor; - - mdbx_cassert(mc, mc->mc_txn->mt_txnid >= mc->mc_txn->mt_env->me_oldest[0]); - if (node->mn_flags & F_SUBDATA) { - memcpy(&mx->mx_db, NODEDATA(node), sizeof(MDBX_db)); - mx->mx_cursor.mc_pg[0] = 0; - mx->mx_cursor.mc_snum = 0; - mx->mx_cursor.mc_top = 0; - mx->mx_cursor.mc_flags = C_SUB; - } else { - MDBX_page *fp = NODEDATA(node); - mx->mx_db.md_xsize = 0; - mx->mx_db.md_flags = 0; - mx->mx_db.md_depth = 1; - mx->mx_db.md_branch_pages = 0; - mx->mx_db.md_leaf_pages = 1; - mx->mx_db.md_overflow_pages = 0; - mx->mx_db.md_entries = NUMKEYS(fp); - mx->mx_db.md_root = fp->mp_pgno; - mx->mx_cursor.mc_snum = 1; - mx->mx_cursor.mc_top = 0; - mx->mx_cursor.mc_flags = C_INITIALIZED | C_SUB; - mx->mx_cursor.mc_pg[0] = fp; - mx->mx_cursor.mc_ki[0] = 0; - if (mc->mc_db->md_flags & MDBX_DUPFIXED) { - mx->mx_db.md_flags = MDBX_DUPFIXED; - mx->mx_db.md_xsize = fp->mp_leaf2_ksize; - if (mc->mc_db->md_flags & MDBX_INTEGERDUP) - mx->mx_db.md_flags |= MDBX_INTEGERKEY; - } - } - mdbx_debug("Sub-db -%u root page %" PRIaPGNO "", mx->mx_cursor.mc_dbi, - mx->mx_db.md_root); - mx->mx_dbflag = DB_VALID | DB_USRVALID | DB_DUPDATA; - /* FIXME: #if UINT_MAX < SIZE_MAX - if (mx->mx_dbx.md_cmp == mdbx_cmp_int && mx->mx_db.md_pad == - sizeof(size_t)) - mx->mx_dbx.md_cmp = mdbx_cmp_clong; - #endif */ -} - -/* Fixup a sorted-dups cursor due to underlying update. - * Sets up some fields that depend on the data from the main cursor. - * Almost the same as init1, but skips initialization steps if the - * xcursor had already been used. - * [in] mc The main cursor whose sorted-dups cursor is to be fixed up. - * [in] src_mx The xcursor of an up-to-date cursor. - * [in] new_dupdata True if converting from a non-F_DUPDATA item. */ -static void mdbx_xcursor_init2(MDBX_cursor *mc, MDBX_xcursor *src_mx, - int new_dupdata) { - MDBX_xcursor *mx = mc->mc_xcursor; - - mdbx_cassert(mc, mc->mc_txn->mt_txnid >= mc->mc_txn->mt_env->me_oldest[0]); - if (new_dupdata) { - mx->mx_cursor.mc_snum = 1; - mx->mx_cursor.mc_top = 0; - mx->mx_cursor.mc_flags |= C_INITIALIZED; - mx->mx_cursor.mc_ki[0] = 0; - mx->mx_dbflag = DB_VALID | DB_USRVALID | DB_DUPDATA; - mx->mx_dbx.md_cmp = src_mx->mx_dbx.md_cmp; - } else if (!(mx->mx_cursor.mc_flags & C_INITIALIZED)) { - return; - } - mx->mx_db = src_mx->mx_db; - mx->mx_cursor.mc_pg[0] = src_mx->mx_cursor.mc_pg[0]; - mdbx_debug("Sub-db -%u root page %" PRIaPGNO "", mx->mx_cursor.mc_dbi, - mx->mx_db.md_root); -} - -/* Initialize a cursor for a given transaction and database. */ -static void mdbx_cursor_init(MDBX_cursor *mc, MDBX_txn *txn, MDBX_dbi dbi, - MDBX_xcursor *mx) { - mc->mc_signature = MDBX_MC_SIGNATURE; - mc->mc_next = NULL; - mc->mc_backup = NULL; - mc->mc_dbi = dbi; - mc->mc_txn = txn; - mc->mc_db = &txn->mt_dbs[dbi]; - mc->mc_dbx = &txn->mt_dbxs[dbi]; - mc->mc_dbflag = &txn->mt_dbflags[dbi]; - mc->mc_snum = 0; - mc->mc_top = 0; - mc->mc_pg[0] = 0; - mc->mc_flags = 0; - mc->mc_ki[0] = 0; - mc->mc_xcursor = NULL; - if (txn->mt_dbs[dbi].md_flags & MDBX_DUPSORT) { - mdbx_tassert(txn, mx != NULL); - mx->mx_cursor.mc_signature = MDBX_MC_SIGNATURE; - mc->mc_xcursor = mx; - mdbx_xcursor_init0(mc); - } - mdbx_cassert(mc, mc->mc_txn->mt_txnid >= mc->mc_txn->mt_env->me_oldest[0]); - if (unlikely(*mc->mc_dbflag & DB_STALE)) { - mdbx_page_search(mc, NULL, MDBX_PS_ROOTONLY); - } -} - -int mdbx_cursor_open(MDBX_txn *txn, MDBX_dbi dbi, MDBX_cursor **ret) { - MDBX_cursor *mc; - size_t size = sizeof(MDBX_cursor); - - if (unlikely(!ret || !txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_VALID))) - return MDBX_EINVAL; - - if (unlikely(txn->mt_flags & MDBX_TXN_BLOCKED)) - return MDBX_BAD_TXN; - - if (unlikely(dbi == FREE_DBI && !F_ISSET(txn->mt_flags, MDBX_TXN_RDONLY))) - return MDBX_EINVAL; - - if (txn->mt_dbs[dbi].md_flags & MDBX_DUPSORT) - size += sizeof(MDBX_xcursor); - - if (likely((mc = malloc(size)) != NULL)) { - mdbx_cursor_init(mc, txn, dbi, (MDBX_xcursor *)(mc + 1)); - if (txn->mt_cursors) { - mc->mc_next = txn->mt_cursors[dbi]; - txn->mt_cursors[dbi] = mc; - mc->mc_flags |= C_UNTRACK; - } - } else { - return MDBX_ENOMEM; - } - - *ret = mc; - - return MDBX_SUCCESS; -} - -int mdbx_cursor_renew(MDBX_txn *txn, MDBX_cursor *mc) { - if (unlikely(!mc || !txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(mc->mc_signature != MDBX_MC_SIGNATURE && - mc->mc_signature != MDBX_MC_READY4CLOSE)) - return MDBX_EINVAL; - - if (unlikely(!TXN_DBI_EXIST(txn, mc->mc_dbi, DB_VALID))) - return MDBX_EINVAL; - - if (unlikely(mc->mc_backup)) - return MDBX_EINVAL; - - if (unlikely((mc->mc_flags & C_UNTRACK) || txn->mt_cursors)) { - MDBX_cursor **prev = &mc->mc_txn->mt_cursors[mc->mc_dbi]; - while (*prev && *prev != mc) - prev = &(*prev)->mc_next; - if (*prev == mc) - *prev = mc->mc_next; - mc->mc_signature = MDBX_MC_READY4CLOSE; - } - - if (unlikely(txn->mt_flags & MDBX_TXN_BLOCKED)) - return MDBX_BAD_TXN; - - mdbx_cursor_init(mc, txn, mc->mc_dbi, mc->mc_xcursor); - return MDBX_SUCCESS; -} - -/* Return the count of duplicate data items for the current key */ -int mdbx_cursor_count(MDBX_cursor *mc, size_t *countp) { - if (unlikely(mc == NULL || countp == NULL)) - return MDBX_EINVAL; - - if (unlikely(mc->mc_signature != MDBX_MC_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(mc->mc_txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(mc->mc_txn->mt_flags & MDBX_TXN_BLOCKED)) - return MDBX_BAD_TXN; - - if (unlikely(!(mc->mc_flags & C_INITIALIZED))) - return MDBX_EINVAL; - - if (!mc->mc_snum) { - *countp = 0; - return MDBX_NOTFOUND; - } - - MDBX_page *mp = mc->mc_pg[mc->mc_top]; - if ((mc->mc_flags & C_EOF) && mc->mc_ki[mc->mc_top] >= NUMKEYS(mp)) { - *countp = 0; - return MDBX_NOTFOUND; - } - - *countp = 1; - if (mc->mc_xcursor != NULL) { - MDBX_node *leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]); - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - mdbx_cassert(mc, mc->mc_xcursor && (mc->mc_xcursor->mx_cursor.mc_flags & - C_INITIALIZED)); - *countp = unlikely(mc->mc_xcursor->mx_db.md_entries > SIZE_MAX) - ? SIZE_MAX - : (size_t)mc->mc_xcursor->mx_db.md_entries; - } - } - return MDBX_SUCCESS; -} - -void mdbx_cursor_close(MDBX_cursor *mc) { - if (mc) { - mdbx_ensure(NULL, mc->mc_signature == MDBX_MC_SIGNATURE || - mc->mc_signature == MDBX_MC_READY4CLOSE); - if (!mc->mc_backup) { - /* Remove from txn, if tracked. - * A read-only txn (!C_UNTRACK) may have been freed already, - * so do not peek inside it. Only write txns track cursors. */ - if ((mc->mc_flags & C_UNTRACK) && mc->mc_txn->mt_cursors) { - MDBX_cursor **prev = &mc->mc_txn->mt_cursors[mc->mc_dbi]; - while (*prev && *prev != mc) - prev = &(*prev)->mc_next; - if (*prev == mc) - *prev = mc->mc_next; - } - mc->mc_signature = 0; - free(mc); - } else { - /* cursor closed before nested txn ends */ - mdbx_cassert(mc, mc->mc_signature == MDBX_MC_SIGNATURE); - mc->mc_signature = MDBX_MC_WAIT4EOT; - } - } -} - -MDBX_txn *mdbx_cursor_txn(MDBX_cursor *mc) { - if (unlikely(!mc || mc->mc_signature != MDBX_MC_SIGNATURE)) - return NULL; - return mc->mc_txn; -} - -MDBX_dbi mdbx_cursor_dbi(MDBX_cursor *mc) { - if (unlikely(!mc || mc->mc_signature != MDBX_MC_SIGNATURE)) - return UINT_MAX; - return mc->mc_dbi; -} - -/* Replace the key for a branch node with a new key. - * Set MDBX_TXN_ERROR on failure. - * [in] mc Cursor pointing to the node to operate on. - * [in] key The new key to use. - * Returns 0 on success, non-zero on failure. */ -static int mdbx_update_key(MDBX_cursor *mc, MDBX_val *key) { - MDBX_page *mp; - MDBX_node *node; - char *base; - size_t len; - int delta, ksize, oksize; - indx_t ptr, i, numkeys, indx; - DKBUF; - - indx = mc->mc_ki[mc->mc_top]; - mp = mc->mc_pg[mc->mc_top]; - node = NODEPTR(mp, indx); - ptr = mp->mp_ptrs[indx]; - if (MDBX_DEBUG) { - MDBX_val k2; - char kbuf2[DKBUF_MAXKEYSIZE * 2 + 1]; - k2.iov_base = NODEKEY(node); - k2.iov_len = node->mn_ksize; - mdbx_debug("update key %u (ofs %u) [%s] to [%s] on page %" PRIaPGNO "", - indx, ptr, mdbx_dkey(&k2, kbuf2, sizeof(kbuf2)), DKEY(key), - mp->mp_pgno); - } - - /* Sizes must be 2-byte aligned. */ - ksize = EVEN(key->iov_len); - oksize = EVEN(node->mn_ksize); - delta = ksize - oksize; - - /* Shift node contents if EVEN(key length) changed. */ - if (delta) { - if (delta > 0 && SIZELEFT(mp) < delta) { - pgno_t pgno; - /* not enough space left, do a delete and split */ - mdbx_debug("Not enough room, delta = %d, splitting...", delta); - pgno = NODEPGNO(node); - mdbx_node_del(mc, 0); - return mdbx_page_split(mc, key, NULL, pgno, MDBX_SPLIT_REPLACE); - } - - numkeys = NUMKEYS(mp); - for (i = 0; i < numkeys; i++) { - if (mp->mp_ptrs[i] <= ptr) { - mdbx_cassert(mc, mp->mp_ptrs[i] >= delta); - mp->mp_ptrs[i] -= (indx_t)delta; - } - } - - base = (char *)mp + mp->mp_upper + PAGEHDRSZ; - len = ptr - mp->mp_upper + NODESIZE; - memmove(base - delta, base, len); - mdbx_cassert(mc, mp->mp_upper >= delta); - mp->mp_upper -= (indx_t)delta; - - node = NODEPTR(mp, indx); - } - - /* But even if no shift was needed, update ksize */ - if (node->mn_ksize != key->iov_len) - node->mn_ksize = (uint16_t)key->iov_len; - - if (key->iov_len) - memcpy(NODEKEY(node), key->iov_base, key->iov_len); - - return MDBX_SUCCESS; -} - -static void mdbx_cursor_copy(const MDBX_cursor *csrc, MDBX_cursor *cdst); - -/* Perform act while tracking temporary cursor mn */ -#define WITH_CURSOR_TRACKING(mn, act) \ - do { \ - mdbx_cassert(&(mn), \ - mn.mc_txn->mt_cursors != NULL /* must be not rdonly txt */); \ - MDBX_cursor mc_dummy, *tracked, \ - **tp = &(mn).mc_txn->mt_cursors[mn.mc_dbi]; \ - if ((mn).mc_flags & C_SUB) { \ - mc_dummy.mc_flags = C_INITIALIZED; \ - mc_dummy.mc_xcursor = (MDBX_xcursor *)&(mn); \ - tracked = &mc_dummy; \ - } else { \ - tracked = &(mn); \ - } \ - tracked->mc_next = *tp; \ - *tp = tracked; \ - { act; } \ - *tp = tracked->mc_next; \ - } while (0) - -/* Move a node from csrc to cdst. */ -static int mdbx_node_move(MDBX_cursor *csrc, MDBX_cursor *cdst, int fromleft) { - MDBX_node *srcnode; - MDBX_val key, data; - pgno_t srcpg; - MDBX_cursor mn; - int rc; - unsigned flags; - - DKBUF; - - /* Mark src and dst as dirty. */ - if (unlikely((rc = mdbx_page_touch(csrc)) || (rc = mdbx_page_touch(cdst)))) - return rc; - - if (IS_LEAF2(csrc->mc_pg[csrc->mc_top])) { - key.iov_len = csrc->mc_db->md_xsize; - key.iov_base = LEAF2KEY(csrc->mc_pg[csrc->mc_top], - csrc->mc_ki[csrc->mc_top], key.iov_len); - data.iov_len = 0; - data.iov_base = NULL; - srcpg = 0; - flags = 0; - } else { - srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top]); - mdbx_cassert(csrc, !((size_t)srcnode & 1)); - srcpg = NODEPGNO(srcnode); - flags = srcnode->mn_flags; - if (csrc->mc_ki[csrc->mc_top] == 0 && - IS_BRANCH(csrc->mc_pg[csrc->mc_top])) { - unsigned snum = csrc->mc_snum; - MDBX_node *s2; - /* must find the lowest key below src */ - rc = mdbx_page_search_lowest(csrc); - if (unlikely(rc)) - return rc; - if (IS_LEAF2(csrc->mc_pg[csrc->mc_top])) { - key.iov_len = csrc->mc_db->md_xsize; - key.iov_base = LEAF2KEY(csrc->mc_pg[csrc->mc_top], 0, key.iov_len); - } else { - s2 = NODEPTR(csrc->mc_pg[csrc->mc_top], 0); - key.iov_len = NODEKSZ(s2); - key.iov_base = NODEKEY(s2); - } - mdbx_cassert(csrc, snum >= 1 && snum <= UINT16_MAX); - csrc->mc_snum = (uint16_t)snum--; - csrc->mc_top = (uint16_t)snum; - } else { - key.iov_len = NODEKSZ(srcnode); - key.iov_base = NODEKEY(srcnode); - } - data.iov_len = NODEDSZ(srcnode); - data.iov_base = NODEDATA(srcnode); - } - mn.mc_xcursor = NULL; - if (IS_BRANCH(cdst->mc_pg[cdst->mc_top]) && cdst->mc_ki[cdst->mc_top] == 0) { - unsigned snum = cdst->mc_snum; - MDBX_node *s2; - MDBX_val bkey; - /* must find the lowest key below dst */ - mdbx_cursor_copy(cdst, &mn); - rc = mdbx_page_search_lowest(&mn); - if (unlikely(rc)) - return rc; - if (IS_LEAF2(mn.mc_pg[mn.mc_top])) { - bkey.iov_len = mn.mc_db->md_xsize; - bkey.iov_base = LEAF2KEY(mn.mc_pg[mn.mc_top], 0, bkey.iov_len); - } else { - s2 = NODEPTR(mn.mc_pg[mn.mc_top], 0); - bkey.iov_len = NODEKSZ(s2); - bkey.iov_base = NODEKEY(s2); - } - mdbx_cassert(csrc, snum >= 1 && snum <= UINT16_MAX); - mn.mc_snum = (uint16_t)snum--; - mn.mc_top = (uint16_t)snum; - mn.mc_ki[snum] = 0; - rc = mdbx_update_key(&mn, &bkey); - if (unlikely(rc)) - return rc; - } - - mdbx_debug("moving %s node %u [%s] on page %" PRIaPGNO - " to node %u on page %" PRIaPGNO "", - IS_LEAF(csrc->mc_pg[csrc->mc_top]) ? "leaf" : "branch", - csrc->mc_ki[csrc->mc_top], DKEY(&key), - csrc->mc_pg[csrc->mc_top]->mp_pgno, cdst->mc_ki[cdst->mc_top], - cdst->mc_pg[cdst->mc_top]->mp_pgno); - - /* Add the node to the destination page. */ - rc = - mdbx_node_add(cdst, cdst->mc_ki[cdst->mc_top], &key, &data, srcpg, flags); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - - /* Delete the node from the source page. */ - mdbx_node_del(csrc, key.iov_len); - - { - /* Adjust other cursors pointing to mp */ - MDBX_cursor *m2, *m3; - MDBX_dbi dbi = csrc->mc_dbi; - MDBX_page *mpd, *mps; - - mps = csrc->mc_pg[csrc->mc_top]; - /* If we're adding on the left, bump others up */ - if (fromleft) { - mpd = cdst->mc_pg[csrc->mc_top]; - for (m2 = csrc->mc_txn->mt_cursors[dbi]; m2; m2 = m2->mc_next) { - if (csrc->mc_flags & C_SUB) - m3 = &m2->mc_xcursor->mx_cursor; - else - m3 = m2; - if (!(m3->mc_flags & C_INITIALIZED) || m3->mc_top < csrc->mc_top) - continue; - if (m3 != cdst && m3->mc_pg[csrc->mc_top] == mpd && - m3->mc_ki[csrc->mc_top] >= cdst->mc_ki[csrc->mc_top]) { - m3->mc_ki[csrc->mc_top]++; - } - if (m3 != csrc && m3->mc_pg[csrc->mc_top] == mps && - m3->mc_ki[csrc->mc_top] == csrc->mc_ki[csrc->mc_top]) { - m3->mc_pg[csrc->mc_top] = cdst->mc_pg[cdst->mc_top]; - m3->mc_ki[csrc->mc_top] = cdst->mc_ki[cdst->mc_top]; - m3->mc_ki[csrc->mc_top - 1]++; - } - if (XCURSOR_INITED(m3) && IS_LEAF(mps)) - XCURSOR_REFRESH(m3, m3->mc_pg[csrc->mc_top], m3->mc_ki[csrc->mc_top]); - } - } else - /* Adding on the right, bump others down */ - { - for (m2 = csrc->mc_txn->mt_cursors[dbi]; m2; m2 = m2->mc_next) { - if (csrc->mc_flags & C_SUB) - m3 = &m2->mc_xcursor->mx_cursor; - else - m3 = m2; - if (m3 == csrc) - continue; - if (!(m3->mc_flags & C_INITIALIZED) || m3->mc_top < csrc->mc_top) - continue; - if (m3->mc_pg[csrc->mc_top] == mps) { - if (!m3->mc_ki[csrc->mc_top]) { - m3->mc_pg[csrc->mc_top] = cdst->mc_pg[cdst->mc_top]; - m3->mc_ki[csrc->mc_top] = cdst->mc_ki[cdst->mc_top]; - m3->mc_ki[csrc->mc_top - 1]--; - } else { - m3->mc_ki[csrc->mc_top]--; - } - if (XCURSOR_INITED(m3) && IS_LEAF(mps)) - XCURSOR_REFRESH(m3, m3->mc_pg[csrc->mc_top], - m3->mc_ki[csrc->mc_top]); - } - } - } - } - - /* Update the parent separators. */ - if (csrc->mc_ki[csrc->mc_top] == 0) { - if (csrc->mc_ki[csrc->mc_top - 1] != 0) { - if (IS_LEAF2(csrc->mc_pg[csrc->mc_top])) { - key.iov_base = LEAF2KEY(csrc->mc_pg[csrc->mc_top], 0, key.iov_len); - } else { - srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], 0); - key.iov_len = NODEKSZ(srcnode); - key.iov_base = NODEKEY(srcnode); - } - mdbx_debug("update separator for source page %" PRIaPGNO " to [%s]", - csrc->mc_pg[csrc->mc_top]->mp_pgno, DKEY(&key)); - mdbx_cursor_copy(csrc, &mn); - mn.mc_snum--; - mn.mc_top--; - /* We want mdbx_rebalance to find mn when doing fixups */ - WITH_CURSOR_TRACKING(mn, rc = mdbx_update_key(&mn, &key)); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - } - if (IS_BRANCH(csrc->mc_pg[csrc->mc_top])) { - MDBX_val nullkey; - indx_t ix = csrc->mc_ki[csrc->mc_top]; - nullkey.iov_len = 0; - csrc->mc_ki[csrc->mc_top] = 0; - rc = mdbx_update_key(csrc, &nullkey); - csrc->mc_ki[csrc->mc_top] = ix; - mdbx_cassert(csrc, rc == MDBX_SUCCESS); - } - } - - if (cdst->mc_ki[cdst->mc_top] == 0) { - if (cdst->mc_ki[cdst->mc_top - 1] != 0) { - if (IS_LEAF2(csrc->mc_pg[csrc->mc_top])) { - key.iov_base = LEAF2KEY(cdst->mc_pg[cdst->mc_top], 0, key.iov_len); - } else { - srcnode = NODEPTR(cdst->mc_pg[cdst->mc_top], 0); - key.iov_len = NODEKSZ(srcnode); - key.iov_base = NODEKEY(srcnode); - } - mdbx_debug("update separator for destination page %" PRIaPGNO " to [%s]", - cdst->mc_pg[cdst->mc_top]->mp_pgno, DKEY(&key)); - mdbx_cursor_copy(cdst, &mn); - mn.mc_snum--; - mn.mc_top--; - /* We want mdbx_rebalance to find mn when doing fixups */ - WITH_CURSOR_TRACKING(mn, rc = mdbx_update_key(&mn, &key)); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - } - if (IS_BRANCH(cdst->mc_pg[cdst->mc_top])) { - MDBX_val nullkey; - indx_t ix = cdst->mc_ki[cdst->mc_top]; - nullkey.iov_len = 0; - cdst->mc_ki[cdst->mc_top] = 0; - rc = mdbx_update_key(cdst, &nullkey); - cdst->mc_ki[cdst->mc_top] = ix; - mdbx_cassert(cdst, rc == MDBX_SUCCESS); - } - } - - return MDBX_SUCCESS; -} - -/* Merge one page into another. - * - * The nodes from the page pointed to by csrc will be copied to the page - * pointed to by cdst and then the csrc page will be freed. - * - * [in] csrc Cursor pointing to the source page. - * [in] cdst Cursor pointing to the destination page. - * - * Returns 0 on success, non-zero on failure. */ -static int mdbx_page_merge(MDBX_cursor *csrc, MDBX_cursor *cdst) { - MDBX_page *psrc, *pdst; - MDBX_node *srcnode; - MDBX_val key, data; - unsigned nkeys; - int rc; - unsigned i, j; - - psrc = csrc->mc_pg[csrc->mc_top]; - pdst = cdst->mc_pg[cdst->mc_top]; - - mdbx_debug("merging page %" PRIaPGNO " into %" PRIaPGNO "", psrc->mp_pgno, - pdst->mp_pgno); - - mdbx_cassert(csrc, csrc->mc_snum > 1); /* can't merge root page */ - mdbx_cassert(csrc, cdst->mc_snum > 1); - - /* Mark dst as dirty. */ - if (unlikely(rc = mdbx_page_touch(cdst))) - return rc; - - /* get dst page again now that we've touched it. */ - pdst = cdst->mc_pg[cdst->mc_top]; - - /* Move all nodes from src to dst. */ - j = nkeys = NUMKEYS(pdst); - if (IS_LEAF2(psrc)) { - key.iov_len = csrc->mc_db->md_xsize; - key.iov_base = PAGEDATA(psrc); - for (i = 0; i < NUMKEYS(psrc); i++, j++) { - rc = mdbx_node_add(cdst, j, &key, NULL, 0, 0); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - key.iov_base = (char *)key.iov_base + key.iov_len; - } - } else { - for (i = 0; i < NUMKEYS(psrc); i++, j++) { - srcnode = NODEPTR(psrc, i); - if (i == 0 && IS_BRANCH(psrc)) { - MDBX_cursor mn; - MDBX_node *s2; - mdbx_cursor_copy(csrc, &mn); - mn.mc_xcursor = NULL; - /* must find the lowest key below src */ - rc = mdbx_page_search_lowest(&mn); - if (unlikely(rc)) - return rc; - if (IS_LEAF2(mn.mc_pg[mn.mc_top])) { - key.iov_len = mn.mc_db->md_xsize; - key.iov_base = LEAF2KEY(mn.mc_pg[mn.mc_top], 0, key.iov_len); - } else { - s2 = NODEPTR(mn.mc_pg[mn.mc_top], 0); - key.iov_len = NODEKSZ(s2); - key.iov_base = NODEKEY(s2); - } - } else { - key.iov_len = srcnode->mn_ksize; - key.iov_base = NODEKEY(srcnode); - } - - data.iov_len = NODEDSZ(srcnode); - data.iov_base = NODEDATA(srcnode); - rc = mdbx_node_add(cdst, j, &key, &data, NODEPGNO(srcnode), - srcnode->mn_flags); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - } - } - - mdbx_debug("dst page %" PRIaPGNO " now has %u keys (%.1f%% filled)", - pdst->mp_pgno, NUMKEYS(pdst), - (float)PAGEFILL(cdst->mc_txn->mt_env, pdst) / 10); - - /* Unlink the src page from parent and add to free list. */ - csrc->mc_top--; - mdbx_node_del(csrc, 0); - if (csrc->mc_ki[csrc->mc_top] == 0) { - key.iov_len = 0; - rc = mdbx_update_key(csrc, &key); - if (unlikely(rc)) { - csrc->mc_top++; - return rc; - } - } - csrc->mc_top++; - - psrc = csrc->mc_pg[csrc->mc_top]; - /* If not operating on FreeDB, allow this page to be reused - * in this txn. Otherwise just add to free list. */ - rc = mdbx_page_loose(csrc, psrc); - if (unlikely(rc)) - return rc; - if (IS_LEAF(psrc)) - csrc->mc_db->md_leaf_pages--; - else - csrc->mc_db->md_branch_pages--; - { - /* Adjust other cursors pointing to mp */ - MDBX_cursor *m2, *m3; - MDBX_dbi dbi = csrc->mc_dbi; - unsigned top = csrc->mc_top; - - for (m2 = csrc->mc_txn->mt_cursors[dbi]; m2; m2 = m2->mc_next) { - if (csrc->mc_flags & C_SUB) - m3 = &m2->mc_xcursor->mx_cursor; - else - m3 = m2; - if (m3 == csrc) - continue; - if (m3->mc_snum < csrc->mc_snum) - continue; - if (m3->mc_pg[top] == psrc) { - m3->mc_pg[top] = pdst; - mdbx_cassert(m3, nkeys + m3->mc_ki[top] <= UINT16_MAX); - m3->mc_ki[top] += (indx_t)nkeys; - m3->mc_ki[top - 1] = cdst->mc_ki[top - 1]; - } else if (m3->mc_pg[top - 1] == csrc->mc_pg[top - 1] && - m3->mc_ki[top - 1] > csrc->mc_ki[top - 1]) { - m3->mc_ki[top - 1]--; - } - if (XCURSOR_INITED(m3) && IS_LEAF(psrc)) - XCURSOR_REFRESH(m3, m3->mc_pg[top], m3->mc_ki[top]); - } - } - { - unsigned snum = cdst->mc_snum; - uint16_t depth = cdst->mc_db->md_depth; - mdbx_cursor_pop(cdst); - rc = mdbx_rebalance(cdst); - /* Did the tree height change? */ - if (depth != cdst->mc_db->md_depth) - snum += cdst->mc_db->md_depth - depth; - mdbx_cassert(cdst, snum >= 1 && snum <= UINT16_MAX); - cdst->mc_snum = (uint16_t)snum; - cdst->mc_top = (uint16_t)(snum - 1); - } - return rc; -} - -/* Copy the contents of a cursor. - * [in] csrc The cursor to copy from. - * [out] cdst The cursor to copy to. */ -static void mdbx_cursor_copy(const MDBX_cursor *csrc, MDBX_cursor *cdst) { - unsigned i; - - mdbx_cassert(csrc, - csrc->mc_txn->mt_txnid >= csrc->mc_txn->mt_env->me_oldest[0]); - cdst->mc_txn = csrc->mc_txn; - cdst->mc_dbi = csrc->mc_dbi; - cdst->mc_db = csrc->mc_db; - cdst->mc_dbx = csrc->mc_dbx; - cdst->mc_snum = csrc->mc_snum; - cdst->mc_top = csrc->mc_top; - cdst->mc_flags = csrc->mc_flags; - - for (i = 0; i < csrc->mc_snum; i++) { - cdst->mc_pg[i] = csrc->mc_pg[i]; - cdst->mc_ki[i] = csrc->mc_ki[i]; - } -} - -/* Rebalance the tree after a delete operation. - * [in] mc Cursor pointing to the page where rebalancing should begin. - * Returns 0 on success, non-zero on failure. */ -static int mdbx_rebalance(MDBX_cursor *mc) { - MDBX_node *node; - int rc, fromleft; - unsigned ptop, minkeys, thresh; - MDBX_cursor mn; - indx_t oldki; - - if (IS_BRANCH(mc->mc_pg[mc->mc_top])) { - minkeys = 2; - thresh = 1; - } else { - minkeys = 1; - thresh = FILL_THRESHOLD; - } - mdbx_debug("rebalancing %s page %" PRIaPGNO " (has %u keys, %.1f%% full)", - IS_LEAF(mc->mc_pg[mc->mc_top]) ? "leaf" : "branch", - mc->mc_pg[mc->mc_top]->mp_pgno, NUMKEYS(mc->mc_pg[mc->mc_top]), - (float)PAGEFILL(mc->mc_txn->mt_env, mc->mc_pg[mc->mc_top]) / 10); - - if (PAGEFILL(mc->mc_txn->mt_env, mc->mc_pg[mc->mc_top]) >= thresh && - NUMKEYS(mc->mc_pg[mc->mc_top]) >= minkeys) { - mdbx_debug("no need to rebalance page %" PRIaPGNO ", above fill threshold", - mc->mc_pg[mc->mc_top]->mp_pgno); - return MDBX_SUCCESS; - } - - if (mc->mc_snum < 2) { - MDBX_page *mp = mc->mc_pg[0]; - unsigned nkeys = NUMKEYS(mp); - if (IS_SUBP(mp)) { - mdbx_debug("Can't rebalance a subpage, ignoring"); - return MDBX_SUCCESS; - } - if (nkeys == 0) { - mdbx_debug("tree is completely empty"); - mc->mc_db->md_root = P_INVALID; - mc->mc_db->md_depth = 0; - mc->mc_db->md_leaf_pages = 0; - rc = mdbx_pnl_append(&mc->mc_txn->mt_befree_pages, mp->mp_pgno); - if (unlikely(rc)) - return rc; - /* Adjust cursors pointing to mp */ - mc->mc_snum = 0; - mc->mc_top = 0; - mc->mc_flags &= ~C_INITIALIZED; - { - MDBX_cursor *m2, *m3; - MDBX_dbi dbi = mc->mc_dbi; - - for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2 = m2->mc_next) { - if (mc->mc_flags & C_SUB) - m3 = &m2->mc_xcursor->mx_cursor; - else - m3 = m2; - if (!(m3->mc_flags & C_INITIALIZED) || (m3->mc_snum < mc->mc_snum)) - continue; - if (m3->mc_pg[0] == mp) { - m3->mc_snum = 0; - m3->mc_top = 0; - m3->mc_flags &= ~C_INITIALIZED; - } - } - } - } else if (IS_BRANCH(mp) && NUMKEYS(mp) == 1) { - int i; - mdbx_debug("collapsing root page!"); - rc = mdbx_pnl_append(&mc->mc_txn->mt_befree_pages, mp->mp_pgno); - if (unlikely(rc)) - return rc; - mc->mc_db->md_root = NODEPGNO(NODEPTR(mp, 0)); - rc = mdbx_page_get(mc, mc->mc_db->md_root, &mc->mc_pg[0], NULL); - if (unlikely(rc)) - return rc; - mc->mc_db->md_depth--; - mc->mc_db->md_branch_pages--; - mc->mc_ki[0] = mc->mc_ki[1]; - for (i = 1; i < mc->mc_db->md_depth; i++) { - mc->mc_pg[i] = mc->mc_pg[i + 1]; - mc->mc_ki[i] = mc->mc_ki[i + 1]; - } - { - /* Adjust other cursors pointing to mp */ - MDBX_cursor *m2, *m3; - MDBX_dbi dbi = mc->mc_dbi; - - for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2 = m2->mc_next) { - if (mc->mc_flags & C_SUB) - m3 = &m2->mc_xcursor->mx_cursor; - else - m3 = m2; - if (m3 == mc) - continue; - if (!(m3->mc_flags & C_INITIALIZED)) - continue; - if (m3->mc_pg[0] == mp) { - for (i = 0; i < mc->mc_db->md_depth; i++) { - m3->mc_pg[i] = m3->mc_pg[i + 1]; - m3->mc_ki[i] = m3->mc_ki[i + 1]; - } - m3->mc_snum--; - m3->mc_top--; - } - } - } - } else { - mdbx_debug("root page %" PRIaPGNO - " doesn't need rebalancing (flags 0x%x)", - mp->mp_pgno, mp->mp_flags); - } - return MDBX_SUCCESS; - } - - /* The parent (branch page) must have at least 2 pointers, - * otherwise the tree is invalid. */ - ptop = mc->mc_top - 1; - mdbx_cassert(mc, NUMKEYS(mc->mc_pg[ptop]) > 1); - - /* Leaf page fill factor is below the threshold. - * Try to move keys from left or right neighbor, or - * merge with a neighbor page. */ - - /* Find neighbors. */ - mdbx_cursor_copy(mc, &mn); - mn.mc_xcursor = NULL; - - oldki = mc->mc_ki[mc->mc_top]; - if (mc->mc_ki[ptop] == 0) { - /* We're the leftmost leaf in our parent. */ - mdbx_debug("reading right neighbor"); - mn.mc_ki[ptop]++; - node = NODEPTR(mc->mc_pg[ptop], mn.mc_ki[ptop]); - rc = mdbx_page_get(mc, NODEPGNO(node), &mn.mc_pg[mn.mc_top], NULL); - if (unlikely(rc)) - return rc; - mn.mc_ki[mn.mc_top] = 0; - mc->mc_ki[mc->mc_top] = NUMKEYS(mc->mc_pg[mc->mc_top]); - fromleft = 0; - } else { - /* There is at least one neighbor to the left. */ - mdbx_debug("reading left neighbor"); - mn.mc_ki[ptop]--; - node = NODEPTR(mc->mc_pg[ptop], mn.mc_ki[ptop]); - rc = mdbx_page_get(mc, NODEPGNO(node), &mn.mc_pg[mn.mc_top], NULL); - if (unlikely(rc)) - return rc; - mn.mc_ki[mn.mc_top] = NUMKEYS(mn.mc_pg[mn.mc_top]) - 1; - mc->mc_ki[mc->mc_top] = 0; - fromleft = 1; - } - - mdbx_debug("found neighbor page %" PRIaPGNO " (%u keys, %.1f%% full)", - mn.mc_pg[mn.mc_top]->mp_pgno, NUMKEYS(mn.mc_pg[mn.mc_top]), - (float)PAGEFILL(mc->mc_txn->mt_env, mn.mc_pg[mn.mc_top]) / 10); - - /* If the neighbor page is above threshold and has enough keys, - * move one key from it. Otherwise we should try to merge them. - * (A branch page must never have less than 2 keys.) */ - if (PAGEFILL(mc->mc_txn->mt_env, mn.mc_pg[mn.mc_top]) >= thresh && - NUMKEYS(mn.mc_pg[mn.mc_top]) > minkeys) { - rc = mdbx_node_move(&mn, mc, fromleft); - if (fromleft) { - /* if we inserted on left, bump position up */ - oldki++; - } - } else { - if (!fromleft) { - rc = mdbx_page_merge(&mn, mc); - } else { - oldki += NUMKEYS(mn.mc_pg[mn.mc_top]); - mn.mc_ki[mn.mc_top] += mc->mc_ki[mn.mc_top] + 1; - /* We want mdbx_rebalance to find mn when doing fixups */ - WITH_CURSOR_TRACKING(mn, rc = mdbx_page_merge(mc, &mn)); - mdbx_cursor_copy(&mn, mc); - } - mc->mc_flags &= ~C_EOF; - } - mc->mc_ki[mc->mc_top] = oldki; - return rc; -} - -/* Complete a delete operation started by mdbx_cursor_del(). */ -static int mdbx_cursor_del0(MDBX_cursor *mc) { - int rc; - MDBX_page *mp; - indx_t ki; - unsigned nkeys; - MDBX_cursor *m2, *m3; - MDBX_dbi dbi = mc->mc_dbi; - - ki = mc->mc_ki[mc->mc_top]; - mp = mc->mc_pg[mc->mc_top]; - mdbx_node_del(mc, mc->mc_db->md_xsize); - mc->mc_db->md_entries--; - { - /* Adjust other cursors pointing to mp */ - for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2 = m2->mc_next) { - m3 = (mc->mc_flags & C_SUB) ? &m2->mc_xcursor->mx_cursor : m2; - if (!(m2->mc_flags & m3->mc_flags & C_INITIALIZED)) - continue; - if (m3 == mc || m3->mc_snum < mc->mc_snum) - continue; - if (m3->mc_pg[mc->mc_top] == mp) { - if (m3->mc_ki[mc->mc_top] == ki) { - m3->mc_flags |= C_DEL; - if (mc->mc_db->md_flags & MDBX_DUPSORT) { - /* Sub-cursor referred into dataset which is gone */ - m3->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED | C_EOF); - } - continue; - } else if (m3->mc_ki[mc->mc_top] > ki) { - m3->mc_ki[mc->mc_top]--; - } - if (XCURSOR_INITED(m3)) - XCURSOR_REFRESH(m3, m3->mc_pg[mc->mc_top], m3->mc_ki[mc->mc_top]); - } - } - } - rc = mdbx_rebalance(mc); - - if (likely(rc == MDBX_SUCCESS)) { - /* DB is totally empty now, just bail out. - * Other cursors adjustments were already done - * by mdbx_rebalance and aren't needed here. */ - if (!mc->mc_snum) { - mc->mc_flags |= C_DEL | C_EOF; - return rc; - } - - mp = mc->mc_pg[mc->mc_top]; - nkeys = NUMKEYS(mp); - - /* Adjust other cursors pointing to mp */ - for (m2 = mc->mc_txn->mt_cursors[dbi]; !rc && m2; m2 = m2->mc_next) { - m3 = (mc->mc_flags & C_SUB) ? &m2->mc_xcursor->mx_cursor : m2; - if (!(m2->mc_flags & m3->mc_flags & C_INITIALIZED)) - continue; - if (m3->mc_snum < mc->mc_snum) - continue; - if (m3->mc_pg[mc->mc_top] == mp) { - /* if m3 points past last node in page, find next sibling */ - if (m3->mc_ki[mc->mc_top] >= mc->mc_ki[mc->mc_top]) { - if (m3->mc_ki[mc->mc_top] >= nkeys) { - rc = mdbx_cursor_sibling(m3, 1); - if (rc == MDBX_NOTFOUND) { - m3->mc_flags |= C_EOF; - rc = MDBX_SUCCESS; - continue; - } - } - if (mc->mc_db->md_flags & MDBX_DUPSORT) { - MDBX_node *node = - NODEPTR(m3->mc_pg[m3->mc_top], m3->mc_ki[m3->mc_top]); - /* If this node has dupdata, it may need to be reinited - * because its data has moved. - * If the xcursor was not initd it must be reinited. - * Else if node points to a subDB, nothing is needed. */ - if (node->mn_flags & F_DUPDATA) { - if (m3->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED) { - if (!(node->mn_flags & F_SUBDATA)) - m3->mc_xcursor->mx_cursor.mc_pg[0] = NODEDATA(node); - } else { - mdbx_xcursor_init1(m3, node); - m3->mc_xcursor->mx_cursor.mc_flags |= C_DEL; - } - } - } - } - } - } - mc->mc_flags |= C_DEL; - } - - if (unlikely(rc)) - mc->mc_txn->mt_flags |= MDBX_TXN_ERROR; - return rc; -} - -int mdbx_del(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key, MDBX_val *data) { - if (unlikely(!key || !txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID))) - return MDBX_EINVAL; - - if (unlikely(txn->mt_flags & (MDBX_TXN_RDONLY | MDBX_TXN_BLOCKED))) - return (txn->mt_flags & MDBX_TXN_RDONLY) ? MDBX_EACCESS : MDBX_BAD_TXN; - - return mdbx_del0(txn, dbi, key, data, 0); -} - -static int mdbx_del0(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key, MDBX_val *data, - unsigned flags) { - MDBX_cursor mc; - MDBX_xcursor mx; - MDBX_cursor_op op; - MDBX_val rdata; - int rc, exact = 0; - DKBUF; - - mdbx_debug("====> delete db %u key [%s], data [%s]", dbi, DKEY(key), - DVAL(data)); - - mdbx_cursor_init(&mc, txn, dbi, &mx); - - if (data) { - op = MDBX_GET_BOTH; - rdata = *data; - data = &rdata; - } else { - op = MDBX_SET; - flags |= MDBX_NODUPDATA; - } - rc = mdbx_cursor_set(&mc, key, data, op, &exact); - if (likely(rc == MDBX_SUCCESS)) { - /* let mdbx_page_split know about this cursor if needed: - * delete will trigger a rebalance; if it needs to move - * a node from one page to another, it will have to - * update the parent's separator key(s). If the new sepkey - * is larger than the current one, the parent page may - * run out of space, triggering a split. We need this - * cursor to be consistent until the end of the rebalance. */ - mc.mc_next = txn->mt_cursors[dbi]; - txn->mt_cursors[dbi] = &mc; - rc = mdbx_cursor_del(&mc, flags); - txn->mt_cursors[dbi] = mc.mc_next; - } - return rc; -} - -/* Split a page and insert a new node. - * Set MDBX_TXN_ERROR on failure. - * [in,out] mc Cursor pointing to the page and desired insertion index. - * The cursor will be updated to point to the actual page and index where - * the node got inserted after the split. - * [in] newkey The key for the newly inserted node. - * [in] newdata The data for the newly inserted node. - * [in] newpgno The page number, if the new node is a branch node. - * [in] nflags The NODE_ADD_FLAGS for the new node. - * Returns 0 on success, non-zero on failure. */ -static int mdbx_page_split(MDBX_cursor *mc, MDBX_val *newkey, MDBX_val *newdata, - pgno_t newpgno, unsigned nflags) { - unsigned flags; - int rc = MDBX_SUCCESS, new_root = 0, did_split = 0; - pgno_t pgno = 0; - unsigned i, ptop; - MDBX_env *env = mc->mc_txn->mt_env; - MDBX_node *node; - MDBX_val sepkey, rkey, xdata, *rdata = &xdata; - MDBX_page *copy = NULL; - MDBX_page *rp, *pp; - MDBX_cursor mn; - DKBUF; - - MDBX_page *mp = mc->mc_pg[mc->mc_top]; - unsigned newindx = mc->mc_ki[mc->mc_top]; - unsigned nkeys = NUMKEYS(mp); - - mdbx_debug("-----> splitting %s page %" PRIaPGNO - " and adding [%s] at index %i/%i", - IS_LEAF(mp) ? "leaf" : "branch", mp->mp_pgno, DKEY(newkey), - mc->mc_ki[mc->mc_top], nkeys); - - /* Create a right sibling. */ - if ((rc = mdbx_page_new(mc, mp->mp_flags, 1, &rp))) - return rc; - rp->mp_leaf2_ksize = mp->mp_leaf2_ksize; - mdbx_debug("new right sibling: page %" PRIaPGNO "", rp->mp_pgno); - - /* Usually when splitting the root page, the cursor - * height is 1. But when called from mdbx_update_key, - * the cursor height may be greater because it walks - * up the stack while finding the branch slot to update. */ - if (mc->mc_top < 1) { - if ((rc = mdbx_page_new(mc, P_BRANCH, 1, &pp))) - goto done; - /* shift current top to make room for new parent */ - for (i = mc->mc_snum; i > 0; i--) { - mc->mc_pg[i] = mc->mc_pg[i - 1]; - mc->mc_ki[i] = mc->mc_ki[i - 1]; - } - mc->mc_pg[0] = pp; - mc->mc_ki[0] = 0; - mc->mc_db->md_root = pp->mp_pgno; - mdbx_debug("root split! new root = %" PRIaPGNO "", pp->mp_pgno); - new_root = mc->mc_db->md_depth++; - - /* Add left (implicit) pointer. */ - if (unlikely((rc = mdbx_node_add(mc, 0, NULL, NULL, mp->mp_pgno, 0)) != - MDBX_SUCCESS)) { - /* undo the pre-push */ - mc->mc_pg[0] = mc->mc_pg[1]; - mc->mc_ki[0] = mc->mc_ki[1]; - mc->mc_db->md_root = mp->mp_pgno; - mc->mc_db->md_depth--; - goto done; - } - mc->mc_snum++; - mc->mc_top++; - ptop = 0; - } else { - ptop = mc->mc_top - 1; - mdbx_debug("parent branch page is %" PRIaPGNO "", mc->mc_pg[ptop]->mp_pgno); - } - - mdbx_cursor_copy(mc, &mn); - mn.mc_xcursor = NULL; - mn.mc_pg[mn.mc_top] = rp; - mn.mc_ki[ptop] = mc->mc_ki[ptop] + 1; - - unsigned split_indx; - if (nflags & MDBX_APPEND) { - mn.mc_ki[mn.mc_top] = 0; - sepkey = *newkey; - split_indx = newindx; - nkeys = 0; - } else { - split_indx = (nkeys + 1) / 2; - - if (IS_LEAF2(rp)) { - char *split, *ins; - int x; - unsigned lsize, rsize, ksize; - /* Move half of the keys to the right sibling */ - x = mc->mc_ki[mc->mc_top] - split_indx; - ksize = mc->mc_db->md_xsize; - split = LEAF2KEY(mp, split_indx, ksize); - rsize = (nkeys - split_indx) * ksize; - lsize = (nkeys - split_indx) * sizeof(indx_t); - mdbx_cassert(mc, mp->mp_lower >= lsize); - mp->mp_lower -= (indx_t)lsize; - mdbx_cassert(mc, rp->mp_lower + lsize <= UINT16_MAX); - rp->mp_lower += (indx_t)lsize; - mdbx_cassert(mc, mp->mp_upper + rsize - lsize <= UINT16_MAX); - mp->mp_upper += (indx_t)(rsize - lsize); - mdbx_cassert(mc, rp->mp_upper >= rsize - lsize); - rp->mp_upper -= (indx_t)(rsize - lsize); - sepkey.iov_len = ksize; - if (newindx == split_indx) { - sepkey.iov_base = newkey->iov_base; - } else { - sepkey.iov_base = split; - } - if (x < 0) { - mdbx_cassert(mc, ksize >= sizeof(indx_t)); - ins = LEAF2KEY(mp, mc->mc_ki[mc->mc_top], ksize); - memcpy(rp->mp_ptrs, split, rsize); - sepkey.iov_base = rp->mp_ptrs; - memmove(ins + ksize, ins, (split_indx - mc->mc_ki[mc->mc_top]) * ksize); - memcpy(ins, newkey->iov_base, ksize); - mdbx_cassert(mc, UINT16_MAX - mp->mp_lower >= (int)sizeof(indx_t)); - mp->mp_lower += sizeof(indx_t); - mdbx_cassert(mc, mp->mp_upper >= ksize - sizeof(indx_t)); - mp->mp_upper -= (indx_t)(ksize - sizeof(indx_t)); - } else { - if (x) - memcpy(rp->mp_ptrs, split, x * ksize); - ins = LEAF2KEY(rp, x, ksize); - memcpy(ins, newkey->iov_base, ksize); - memcpy(ins + ksize, split + x * ksize, rsize - x * ksize); - mdbx_cassert(mc, UINT16_MAX - rp->mp_lower >= (int)sizeof(indx_t)); - rp->mp_lower += sizeof(indx_t); - mdbx_cassert(mc, rp->mp_upper >= ksize - sizeof(indx_t)); - rp->mp_upper -= (indx_t)(ksize - sizeof(indx_t)); - mdbx_cassert(mc, x <= UINT16_MAX); - mc->mc_ki[mc->mc_top] = (indx_t)x; - } - } else { - size_t psize, nsize, k; - /* Maximum free space in an empty page */ - unsigned pmax = env->me_psize - PAGEHDRSZ; - if (IS_LEAF(mp)) - nsize = mdbx_leaf_size(env, newkey, newdata); - else - nsize = mdbx_branch_size(env, newkey); - nsize = EVEN(nsize); - - /* grab a page to hold a temporary copy */ - copy = mdbx_page_malloc(mc->mc_txn, 1); - if (unlikely(copy == NULL)) { - rc = MDBX_ENOMEM; - goto done; - } - copy->mp_pgno = mp->mp_pgno; - copy->mp_flags = mp->mp_flags; - copy->mp_lower = 0; - mdbx_cassert(mc, env->me_psize - PAGEHDRSZ <= UINT16_MAX); - copy->mp_upper = (indx_t)(env->me_psize - PAGEHDRSZ); - - /* prepare to insert */ - for (unsigned j = i = 0; i < nkeys; i++) { - if (i == newindx) - copy->mp_ptrs[j++] = 0; - copy->mp_ptrs[j++] = mp->mp_ptrs[i]; - } - - /* When items are relatively large the split point needs - * to be checked, because being off-by-one will make the - * difference between success or failure in mdbx_node_add. - * - * It's also relevant if a page happens to be laid out - * such that one half of its nodes are all "small" and - * the other half of its nodes are "large." If the new - * item is also "large" and falls on the half with - * "large" nodes, it also may not fit. - * - * As a final tweak, if the new item goes on the last - * spot on the page (and thus, onto the new page), bias - * the split so the new page is emptier than the old page. - * This yields better packing during sequential inserts. - */ - int dir; - if (nkeys < 20 || nsize > pmax / 16 || newindx >= nkeys) { - /* Find split point */ - psize = 0; - if (newindx <= split_indx || newindx >= nkeys) { - i = 0; - dir = 1; - k = (newindx >= nkeys) ? nkeys : split_indx + 1 + IS_LEAF(mp); - } else { - i = nkeys; - dir = -1; - k = split_indx - 1; - } - for (; i != k; i += dir) { - if (i == newindx) { - psize += nsize; - node = NULL; - } else { - node = (MDBX_node *)((char *)mp + copy->mp_ptrs[i] + PAGEHDRSZ); - psize += NODESIZE + NODEKSZ(node) + sizeof(indx_t); - if (IS_LEAF(mp)) { - if (F_ISSET(node->mn_flags, F_BIGDATA)) - psize += sizeof(pgno_t); - else - psize += NODEDSZ(node); - } - psize = EVEN(psize); - } - if (psize > pmax || i == k - dir) { - split_indx = i + (dir < 0); - break; - } - } - } - if (split_indx == newindx) { - sepkey.iov_len = newkey->iov_len; - sepkey.iov_base = newkey->iov_base; - } else { - node = - (MDBX_node *)((char *)mp + copy->mp_ptrs[split_indx] + PAGEHDRSZ); - sepkey.iov_len = node->mn_ksize; - sepkey.iov_base = NODEKEY(node); - } - } - } - - mdbx_debug("separator is %d [%s]", split_indx, DKEY(&sepkey)); - - /* Copy separator key to the parent. */ - if (SIZELEFT(mn.mc_pg[ptop]) < mdbx_branch_size(env, &sepkey)) { - int snum = mc->mc_snum; - mn.mc_snum--; - mn.mc_top--; - did_split = 1; - /* We want other splits to find mn when doing fixups */ - WITH_CURSOR_TRACKING( - mn, rc = mdbx_page_split(&mn, &sepkey, NULL, rp->mp_pgno, 0)); - if (unlikely(rc != MDBX_SUCCESS)) - goto done; - - /* root split? */ - if (mc->mc_snum > snum) - ptop++; - - /* Right page might now have changed parent. - * Check if left page also changed parent. */ - if (mn.mc_pg[ptop] != mc->mc_pg[ptop] && - mc->mc_ki[ptop] >= NUMKEYS(mc->mc_pg[ptop])) { - for (i = 0; i < ptop; i++) { - mc->mc_pg[i] = mn.mc_pg[i]; - mc->mc_ki[i] = mn.mc_ki[i]; - } - mc->mc_pg[ptop] = mn.mc_pg[ptop]; - if (mn.mc_ki[ptop]) { - mc->mc_ki[ptop] = mn.mc_ki[ptop] - 1; - } else { - /* find right page's left sibling */ - mc->mc_ki[ptop] = mn.mc_ki[ptop]; - rc = mdbx_cursor_sibling(mc, 0); - } - } - } else { - mn.mc_top--; - rc = mdbx_node_add(&mn, mn.mc_ki[ptop], &sepkey, NULL, rp->mp_pgno, 0); - mn.mc_top++; - } - if (unlikely(rc != MDBX_SUCCESS)) { - if (rc == MDBX_NOTFOUND) /* improper mdbx_cursor_sibling() result */ { - mdbx_error("unexpected %s", "MDBX_NOTFOUND"); - rc = MDBX_PROBLEM; - } - goto done; - } - if (nflags & MDBX_APPEND) { - mc->mc_pg[mc->mc_top] = rp; - mc->mc_ki[mc->mc_top] = 0; - rc = mdbx_node_add(mc, 0, newkey, newdata, newpgno, nflags); - if (rc) - goto done; - for (i = 0; i < mc->mc_top; i++) - mc->mc_ki[i] = mn.mc_ki[i]; - } else if (!IS_LEAF2(mp)) { - /* Move nodes */ - mc->mc_pg[mc->mc_top] = rp; - i = split_indx; - indx_t n = 0; - do { - if (i == newindx) { - rkey.iov_base = newkey->iov_base; - rkey.iov_len = newkey->iov_len; - if (IS_LEAF(mp)) { - rdata = newdata; - } else - pgno = newpgno; - flags = nflags; - /* Update index for the new key. */ - mc->mc_ki[mc->mc_top] = n; - } else { - node = (MDBX_node *)((char *)mp + copy->mp_ptrs[i] + PAGEHDRSZ); - rkey.iov_base = NODEKEY(node); - rkey.iov_len = node->mn_ksize; - if (IS_LEAF(mp)) { - xdata.iov_base = NODEDATA(node); - xdata.iov_len = NODEDSZ(node); - rdata = &xdata; - } else - pgno = NODEPGNO(node); - flags = node->mn_flags; - } - - if (!IS_LEAF(mp) && n == 0) { - /* First branch index doesn't need key data. */ - rkey.iov_len = 0; - } - - rc = mdbx_node_add(mc, n, &rkey, rdata, pgno, flags); - if (rc) - goto done; - if (i == nkeys) { - i = 0; - n = 0; - mc->mc_pg[mc->mc_top] = copy; - } else { - i++; - n++; - } - } while (i != split_indx); - - nkeys = NUMKEYS(copy); - for (i = 0; i < nkeys; i++) - mp->mp_ptrs[i] = copy->mp_ptrs[i]; - mp->mp_lower = copy->mp_lower; - mp->mp_upper = copy->mp_upper; - memcpy(NODEPTR(mp, nkeys - 1), NODEPTR(copy, nkeys - 1), - env->me_psize - copy->mp_upper - PAGEHDRSZ); - - /* reset back to original page */ - if (newindx < split_indx) { - mc->mc_pg[mc->mc_top] = mp; - } else { - mc->mc_pg[mc->mc_top] = rp; - mc->mc_ki[ptop]++; - /* Make sure mc_ki is still valid. */ - if (mn.mc_pg[ptop] != mc->mc_pg[ptop] && - mc->mc_ki[ptop] >= NUMKEYS(mc->mc_pg[ptop])) { - for (i = 0; i <= ptop; i++) { - mc->mc_pg[i] = mn.mc_pg[i]; - mc->mc_ki[i] = mn.mc_ki[i]; - } - } - } - if (nflags & MDBX_RESERVE) { - node = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]); - if (!(node->mn_flags & F_BIGDATA)) - newdata->iov_base = NODEDATA(node); - } - } else { - if (newindx >= split_indx) { - mc->mc_pg[mc->mc_top] = rp; - mc->mc_ki[ptop]++; - /* Make sure mc_ki is still valid. */ - if (mn.mc_pg[ptop] != mc->mc_pg[ptop] && - mc->mc_ki[ptop] >= NUMKEYS(mc->mc_pg[ptop])) { - for (i = 0; i <= ptop; i++) { - mc->mc_pg[i] = mn.mc_pg[i]; - mc->mc_ki[i] = mn.mc_ki[i]; - } - } - } - } - - { - /* Adjust other cursors pointing to mp */ - MDBX_cursor *m2, *m3; - MDBX_dbi dbi = mc->mc_dbi; - nkeys = NUMKEYS(mp); - - for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2 = m2->mc_next) { - if (mc->mc_flags & C_SUB) - m3 = &m2->mc_xcursor->mx_cursor; - else - m3 = m2; - if (m3 == mc) - continue; - if (!(m2->mc_flags & m3->mc_flags & C_INITIALIZED)) - continue; - if (new_root) { - int k; - /* sub cursors may be on different DB */ - if (m3->mc_pg[0] != mp) - continue; - /* root split */ - for (k = new_root; k >= 0; k--) { - m3->mc_ki[k + 1] = m3->mc_ki[k]; - m3->mc_pg[k + 1] = m3->mc_pg[k]; - } - if (m3->mc_ki[0] >= nkeys) { - m3->mc_ki[0] = 1; - } else { - m3->mc_ki[0] = 0; - } - m3->mc_pg[0] = mc->mc_pg[0]; - m3->mc_snum++; - m3->mc_top++; - } - if (m3->mc_top >= mc->mc_top && m3->mc_pg[mc->mc_top] == mp) { - if (m3->mc_ki[mc->mc_top] >= newindx && !(nflags & MDBX_SPLIT_REPLACE)) - m3->mc_ki[mc->mc_top]++; - if (m3->mc_ki[mc->mc_top] >= nkeys) { - m3->mc_pg[mc->mc_top] = rp; - mdbx_cassert(mc, m3->mc_ki[mc->mc_top] >= nkeys); - m3->mc_ki[mc->mc_top] -= (indx_t)nkeys; - for (i = 0; i < mc->mc_top; i++) { - m3->mc_ki[i] = mn.mc_ki[i]; - m3->mc_pg[i] = mn.mc_pg[i]; - } - } - } else if (!did_split && m3->mc_top >= ptop && - m3->mc_pg[ptop] == mc->mc_pg[ptop] && - m3->mc_ki[ptop] >= mc->mc_ki[ptop]) { - m3->mc_ki[ptop]++; - } - if (XCURSOR_INITED(m3) && IS_LEAF(mp)) - XCURSOR_REFRESH(m3, m3->mc_pg[mc->mc_top], m3->mc_ki[mc->mc_top]); - } - } - mdbx_debug("mp left: %d, rp left: %d", SIZELEFT(mp), SIZELEFT(rp)); - -done: - if (copy) /* tmp page */ - mdbx_page_free(env, copy); - if (unlikely(rc)) - mc->mc_txn->mt_flags |= MDBX_TXN_ERROR; - return rc; -} - -int mdbx_put(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key, MDBX_val *data, - unsigned flags) { - MDBX_cursor mc; - MDBX_xcursor mx; - - if (unlikely(!key || !data || !txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID))) - return MDBX_EINVAL; - - if (unlikely(flags & - ~(MDBX_NOOVERWRITE | MDBX_NODUPDATA | MDBX_RESERVE | - MDBX_APPEND | MDBX_APPENDDUP | MDBX_CURRENT))) - return MDBX_EINVAL; - - if (unlikely(txn->mt_flags & (MDBX_TXN_RDONLY | MDBX_TXN_BLOCKED))) - return (txn->mt_flags & MDBX_TXN_RDONLY) ? MDBX_EACCESS : MDBX_BAD_TXN; - - mdbx_cursor_init(&mc, txn, dbi, &mx); - mc.mc_next = txn->mt_cursors[dbi]; - txn->mt_cursors[dbi] = &mc; - - int rc = MDBX_SUCCESS; - /* LY: support for update (explicit overwrite) */ - if (flags & MDBX_CURRENT) { - rc = mdbx_cursor_get(&mc, key, NULL, MDBX_SET); - if (likely(rc == MDBX_SUCCESS) && - (txn->mt_dbs[dbi].md_flags & MDBX_DUPSORT)) { - /* LY: allows update (explicit overwrite) only for unique keys */ - MDBX_node *leaf = NODEPTR(mc.mc_pg[mc.mc_top], mc.mc_ki[mc.mc_top]); - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - mdbx_tassert(txn, XCURSOR_INITED(&mc) && - mc.mc_xcursor->mx_db.md_entries > 1); - rc = MDBX_EMULTIVAL; - } - } - } - - if (likely(rc == MDBX_SUCCESS)) - rc = mdbx_cursor_put(&mc, key, data, flags); - txn->mt_cursors[dbi] = mc.mc_next; - - return rc; -} - -#ifndef MDBX_WBUF -#define MDBX_WBUF (1024 * 1024) -#endif -#define MDBX_EOF 0x10 /* mdbx_env_copyfd1() is done reading */ - -/* State needed for a double-buffering compacting copy. */ -typedef struct mdbx_copy { - MDBX_env *mc_env; - MDBX_txn *mc_txn; - mdbx_condmutex_t mc_condmutex; - char *mc_wbuf[2]; - char *mc_over[2]; - size_t mc_wlen[2]; - size_t mc_olen[2]; - mdbx_filehandle_t mc_fd; - volatile int mc_error; - pgno_t mc_next_pgno; - short mc_toggle; /* Buffer number in provider */ - short mc_new; /* (0-2 buffers to write) | (MDBX_EOF at end) */ - /* Error code. Never cleared if set. Both threads can set nonzero - * to fail the copy. Not mutex-protected, MDBX expects atomic int. */ -} mdbx_copy; - -/* Dedicated writer thread for compacting copy. */ -static THREAD_RESULT __cold THREAD_CALL mdbx_env_copythr(void *arg) { - mdbx_copy *my = arg; - char *ptr; - int toggle = 0; - int rc; - -#if defined(F_SETNOSIGPIPE) - /* OS X delivers SIGPIPE to the whole process, not the thread that caused it. - * Disable SIGPIPE using platform specific fcntl. */ - int enabled = 1; - if (fcntl(my->mc_fd, F_SETNOSIGPIPE, &enabled)) - my->mc_error = errno; -#endif - -#if defined(SIGPIPE) && !defined(_WIN32) && !defined(_WIN64) - sigset_t set; - sigemptyset(&set); - sigaddset(&set, SIGPIPE); - rc = pthread_sigmask(SIG_BLOCK, &set, NULL); - if (rc != 0) - my->mc_error = rc; -#endif - - mdbx_condmutex_lock(&my->mc_condmutex); - while (!my->mc_error) { - while (!my->mc_new) - mdbx_condmutex_wait(&my->mc_condmutex); - if (my->mc_new == 0 + MDBX_EOF) /* 0 buffers, just EOF */ - break; - size_t wsize = my->mc_wlen[toggle]; - ptr = my->mc_wbuf[toggle]; - again: - if (wsize > 0 && !my->mc_error) { - rc = mdbx_write(my->mc_fd, ptr, wsize); - if (rc != MDBX_SUCCESS) { -#if defined(SIGPIPE) && !defined(_WIN32) && !defined(_WIN64) - if (rc == EPIPE) { - /* Collect the pending SIGPIPE, otherwise (at least OS X) - * gives it to the process on thread-exit (ITS#8504). */ - int tmp; - sigwait(&set, &tmp); - } -#endif - my->mc_error = rc; - } - } - - /* If there's an overflow page tail, write it too */ - if (my->mc_olen[toggle]) { - wsize = my->mc_olen[toggle]; - ptr = my->mc_over[toggle]; - my->mc_olen[toggle] = 0; - goto again; - } - my->mc_wlen[toggle] = 0; - toggle ^= 1; - /* Return the empty buffer to provider */ - my->mc_new--; - mdbx_condmutex_signal(&my->mc_condmutex); - } - mdbx_condmutex_unlock(&my->mc_condmutex); - return (THREAD_RESULT)0; -} - -/* Give buffer and/or MDBX_EOF to writer thread, await unused buffer. - * - * [in] my control structure. - * [in] adjust (1 to hand off 1 buffer) | (MDBX_EOF when ending). */ -static int __cold mdbx_env_cthr_toggle(mdbx_copy *my, int adjust) { - mdbx_condmutex_lock(&my->mc_condmutex); - my->mc_new += (short)adjust; - mdbx_condmutex_signal(&my->mc_condmutex); - while (my->mc_new & 2) /* both buffers in use */ - mdbx_condmutex_wait(&my->mc_condmutex); - mdbx_condmutex_unlock(&my->mc_condmutex); - - my->mc_toggle ^= (adjust & 1); - /* Both threads reset mc_wlen, to be safe from threading errors */ - my->mc_wlen[my->mc_toggle] = 0; - return my->mc_error; -} - -/* Depth-first tree traversal for compacting copy. - * [in] my control structure. - * [in,out] pg database root. - * [in] flags includes F_DUPDATA if it is a sorted-duplicate sub-DB. */ -static int __cold mdbx_env_cwalk(mdbx_copy *my, pgno_t *pg, int flags) { - MDBX_cursor mc; - MDBX_node *ni; - MDBX_page *mo, *mp, *leaf; - char *buf, *ptr; - int rc, toggle; - unsigned i; - - /* Empty DB, nothing to do */ - if (*pg == P_INVALID) - return MDBX_SUCCESS; - - memset(&mc, 0, sizeof(mc)); - mc.mc_snum = 1; - mc.mc_txn = my->mc_txn; - - rc = mdbx_page_get(&mc, *pg, &mc.mc_pg[0], NULL); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - rc = mdbx_page_search_root(&mc, NULL, MDBX_PS_FIRST); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - - /* Make cursor pages writable */ - buf = ptr = malloc(pgno2bytes(my->mc_env, mc.mc_snum)); - if (buf == NULL) - return MDBX_ENOMEM; - - for (i = 0; i < mc.mc_top; i++) { - mdbx_page_copy((MDBX_page *)ptr, mc.mc_pg[i], my->mc_env->me_psize); - mc.mc_pg[i] = (MDBX_page *)ptr; - ptr += my->mc_env->me_psize; - } - - /* This is writable space for a leaf page. Usually not needed. */ - leaf = (MDBX_page *)ptr; - - toggle = my->mc_toggle; - while (mc.mc_snum > 0) { - unsigned n; - mp = mc.mc_pg[mc.mc_top]; - n = NUMKEYS(mp); - - if (IS_LEAF(mp)) { - if (!IS_LEAF2(mp) && !(flags & F_DUPDATA)) { - for (i = 0; i < n; i++) { - ni = NODEPTR(mp, i); - if (ni->mn_flags & F_BIGDATA) { - MDBX_page *omp; - - /* Need writable leaf */ - if (mp != leaf) { - mc.mc_pg[mc.mc_top] = leaf; - mdbx_page_copy(leaf, mp, my->mc_env->me_psize); - mp = leaf; - ni = NODEPTR(mp, i); - } - - pgno_t pgno; - memcpy(&pgno, NODEDATA(ni), sizeof(pgno)); - memcpy(NODEDATA(ni), &my->mc_next_pgno, sizeof(pgno_t)); - rc = mdbx_page_get(&mc, pgno, &omp, NULL); - if (unlikely(rc != MDBX_SUCCESS)) - goto done; - if (my->mc_wlen[toggle] >= MDBX_WBUF) { - rc = mdbx_env_cthr_toggle(my, 1); - if (unlikely(rc != MDBX_SUCCESS)) - goto done; - toggle = my->mc_toggle; - } - mo = (MDBX_page *)(my->mc_wbuf[toggle] + my->mc_wlen[toggle]); - memcpy(mo, omp, my->mc_env->me_psize); - mo->mp_pgno = my->mc_next_pgno; - my->mc_next_pgno += omp->mp_pages; - my->mc_wlen[toggle] += my->mc_env->me_psize; - if (omp->mp_pages > 1) { - my->mc_olen[toggle] = pgno2bytes(my->mc_env, omp->mp_pages - 1); - my->mc_over[toggle] = (char *)omp + my->mc_env->me_psize; - rc = mdbx_env_cthr_toggle(my, 1); - if (unlikely(rc != MDBX_SUCCESS)) - goto done; - toggle = my->mc_toggle; - } - } else if (ni->mn_flags & F_SUBDATA) { - MDBX_db db; - - /* Need writable leaf */ - if (mp != leaf) { - mc.mc_pg[mc.mc_top] = leaf; - mdbx_page_copy(leaf, mp, my->mc_env->me_psize); - mp = leaf; - ni = NODEPTR(mp, i); - } - - memcpy(&db, NODEDATA(ni), sizeof(db)); - my->mc_toggle = (short)toggle; - rc = mdbx_env_cwalk(my, &db.md_root, ni->mn_flags & F_DUPDATA); - if (rc) - goto done; - toggle = my->mc_toggle; - memcpy(NODEDATA(ni), &db, sizeof(db)); - } - } - } - } else { - mc.mc_ki[mc.mc_top]++; - if (mc.mc_ki[mc.mc_top] < n) { - pgno_t pgno; - again: - ni = NODEPTR(mp, mc.mc_ki[mc.mc_top]); - pgno = NODEPGNO(ni); - rc = mdbx_page_get(&mc, pgno, &mp, NULL); - if (unlikely(rc != MDBX_SUCCESS)) - goto done; - mc.mc_top++; - mc.mc_snum++; - mc.mc_ki[mc.mc_top] = 0; - if (IS_BRANCH(mp)) { - /* Whenever we advance to a sibling branch page, - * we must proceed all the way down to its first leaf. */ - mdbx_page_copy(mc.mc_pg[mc.mc_top], mp, my->mc_env->me_psize); - goto again; - } else - mc.mc_pg[mc.mc_top] = mp; - continue; - } - } - if (my->mc_wlen[toggle] >= MDBX_WBUF) { - rc = mdbx_env_cthr_toggle(my, 1); - if (unlikely(rc != MDBX_SUCCESS)) - goto done; - toggle = my->mc_toggle; - } - mo = (MDBX_page *)(my->mc_wbuf[toggle] + my->mc_wlen[toggle]); - mdbx_page_copy(mo, mp, my->mc_env->me_psize); - mo->mp_pgno = my->mc_next_pgno++; - my->mc_wlen[toggle] += my->mc_env->me_psize; - if (mc.mc_top) { - /* Update parent if there is one */ - ni = NODEPTR(mc.mc_pg[mc.mc_top - 1], mc.mc_ki[mc.mc_top - 1]); - SETPGNO(ni, mo->mp_pgno); - mdbx_cursor_pop(&mc); - } else { - /* Otherwise we're done */ - *pg = mo->mp_pgno; - break; - } - } -done: - free(buf); - return rc; -} - -/* Copy environment with compaction. */ -static int __cold mdbx_env_compact(MDBX_env *env, mdbx_filehandle_t fd) { - MDBX_txn *txn = NULL; - mdbx_thread_t thr; - mdbx_copy my; - memset(&my, 0, sizeof(my)); - - int rc = mdbx_condmutex_init(&my.mc_condmutex); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - rc = mdbx_memalign_alloc(env->me_os_psize, MDBX_WBUF * 2, - (void **)&my.mc_wbuf[0]); - if (unlikely(rc != MDBX_SUCCESS)) - goto done; - - memset(my.mc_wbuf[0], 0, MDBX_WBUF * 2); - my.mc_wbuf[1] = my.mc_wbuf[0] + MDBX_WBUF; - my.mc_next_pgno = NUM_METAS; - my.mc_env = env; - my.mc_fd = fd; - rc = mdbx_thread_create(&thr, mdbx_env_copythr, &my); - if (unlikely(rc != MDBX_SUCCESS)) - goto done; - - rc = mdbx_txn_begin(env, NULL, MDBX_RDONLY, &txn); - if (unlikely(rc != MDBX_SUCCESS)) - goto finish; - - MDBX_page *meta = mdbx_init_metas(env, my.mc_wbuf[0]); - - /* Set metapage 1 with current main DB */ - pgno_t new_root, root = txn->mt_dbs[MAIN_DBI].md_root; - if ((new_root = root) != P_INVALID) { - /* Count free pages + freeDB pages. Subtract from last_pg - * to find the new last_pg, which also becomes the new root. */ - pgno_t freecount = 0; - MDBX_cursor mc; - MDBX_val key, data; - - mdbx_cursor_init(&mc, txn, FREE_DBI, NULL); - while ((rc = mdbx_cursor_get(&mc, &key, &data, MDBX_NEXT)) == 0) - freecount += *(pgno_t *)data.iov_base; - if (unlikely(rc != MDBX_NOTFOUND)) - goto finish; - - freecount += txn->mt_dbs[FREE_DBI].md_branch_pages + - txn->mt_dbs[FREE_DBI].md_leaf_pages + - txn->mt_dbs[FREE_DBI].md_overflow_pages; - - new_root = txn->mt_next_pgno - 1 - freecount; - meta->mp_meta.mm_geo.next = meta->mp_meta.mm_geo.now = new_root + 1; - meta->mp_meta.mm_dbs[MAIN_DBI] = txn->mt_dbs[MAIN_DBI]; - meta->mp_meta.mm_dbs[MAIN_DBI].md_root = new_root; - } else { - /* When the DB is empty, handle it specially to - * fix any breakage like page leaks from ITS#8174. */ - meta->mp_meta.mm_dbs[MAIN_DBI].md_flags = txn->mt_dbs[MAIN_DBI].md_flags; - } - - /* copy canary sequenses if present */ - if (txn->mt_canary.v) { - meta->mp_meta.mm_canary = txn->mt_canary; - meta->mp_meta.mm_canary.v = mdbx_meta_txnid_stable(env, &meta->mp_meta); - } - - /* update signature */ - meta->mp_meta.mm_datasync_sign = mdbx_meta_sign(&meta->mp_meta); - - my.mc_wlen[0] = pgno2bytes(env, NUM_METAS); - my.mc_txn = txn; - rc = mdbx_env_cwalk(&my, &root, 0); - if (rc == MDBX_SUCCESS && root != new_root) { - mdbx_error("unexpected root %" PRIaPGNO " (%" PRIaPGNO ")", root, new_root); - rc = MDBX_PROBLEM; /* page leak or corrupt DB */ - } - -finish: - if (rc != MDBX_SUCCESS) - my.mc_error = rc; - mdbx_env_cthr_toggle(&my, 1 | MDBX_EOF); - rc = mdbx_thread_join(thr); - mdbx_txn_abort(txn); - -done: - mdbx_memalign_free(my.mc_wbuf[0]); - mdbx_condmutex_destroy(&my.mc_condmutex); - return rc ? rc : my.mc_error; -} - -/* Copy environment as-is. */ -static int __cold mdbx_env_copy_asis(MDBX_env *env, mdbx_filehandle_t fd) { - MDBX_txn *txn = NULL; - - /* Do the lock/unlock of the reader mutex before starting the - * write txn. Otherwise other read txns could block writers. */ - int rc = mdbx_txn_begin(env, NULL, MDBX_RDONLY, &txn); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - - /* We must start the actual read txn after blocking writers */ - rc = mdbx_txn_end(txn, MDBX_END_RESET_TMP); - if (unlikely(rc != MDBX_SUCCESS)) - goto bailout; /* FIXME: or just return? */ - - /* Temporarily block writers until we snapshot the meta pages */ - rc = mdbx_txn_lock(env, false); - if (unlikely(rc != MDBX_SUCCESS)) - goto bailout; - - rc = mdbx_txn_renew0(txn, MDBX_RDONLY); - if (unlikely(rc != MDBX_SUCCESS)) { - mdbx_txn_unlock(env); - goto bailout; - } - - rc = mdbx_write(fd, env->me_map, pgno2bytes(env, NUM_METAS)); - MDBX_meta *const head = mdbx_meta_head(env); - const uint64_t size = - mdbx_roundup2(pgno2bytes(env, head->mm_geo.now), env->me_os_psize); - mdbx_txn_unlock(env); - - if (likely(rc == MDBX_SUCCESS)) - rc = mdbx_write(fd, env->me_map + pgno2bytes(env, NUM_METAS), - pgno2bytes(env, txn->mt_next_pgno - NUM_METAS)); - - if (likely(rc == MDBX_SUCCESS)) - rc = mdbx_ftruncate(fd, size); - -bailout: - mdbx_txn_abort(txn); - return rc; -} - -int __cold mdbx_env_copy2fd(MDBX_env *env, mdbx_filehandle_t fd, - unsigned flags) { - if (flags & MDBX_CP_COMPACT) - return mdbx_env_compact(env, fd); - - return mdbx_env_copy_asis(env, fd); -} - -int __cold mdbx_env_copy(MDBX_env *env, const char *path, unsigned flags) { - char *lck_pathname; - mdbx_filehandle_t newfd = INVALID_HANDLE_VALUE; - - if (env->me_flags & MDBX_NOSUBDIR) { - lck_pathname = (char *)path; - } else { - size_t len = strlen(path); - len += sizeof(MDBX_DATANAME); - lck_pathname = malloc(len); - if (!lck_pathname) - return MDBX_ENOMEM; - sprintf(lck_pathname, "%s" MDBX_DATANAME, path); - } - - /* The destination path must exist, but the destination file must not. - * We don't want the OS to cache the writes, since the source data is - * already in the OS cache. */ - int rc = - mdbx_openfile(lck_pathname, O_WRONLY | O_CREAT | O_EXCL, 0666, &newfd); - if (rc == MDBX_SUCCESS) { - if (env->me_psize >= env->me_os_psize) { -#ifdef F_NOCACHE /* __APPLE__ */ - (void)fcntl(newfd, F_NOCACHE, 1); -#elif defined(O_DIRECT) && defined(F_GETFL) - /* Set O_DIRECT if the file system supports it */ - if ((rc = fcntl(newfd, F_GETFL)) != -1) - (void)fcntl(newfd, F_SETFL, rc | O_DIRECT); -#endif - } - rc = mdbx_env_copy2fd(env, newfd, flags); - } - - if (!(env->me_flags & MDBX_NOSUBDIR)) - free(lck_pathname); - - if (newfd != INVALID_HANDLE_VALUE) { - int err = mdbx_closefile(newfd); - if (rc == MDBX_SUCCESS && err != rc) - rc = err; - } - - return rc; -} - -int __cold mdbx_env_set_flags(MDBX_env *env, unsigned flags, int onoff) { - if (unlikely(flags & ~CHANGEABLE)) - return MDBX_EINVAL; - - int rc = mdbx_txn_lock(env, false); - if (unlikely(rc)) - return rc; - - if (onoff) - env->me_flags |= flags; - else - env->me_flags &= ~flags; - - mdbx_txn_unlock(env); - return MDBX_SUCCESS; -} - -int __cold mdbx_env_get_flags(MDBX_env *env, unsigned *arg) { - if (unlikely(!env || !arg)) - return MDBX_EINVAL; - - *arg = env->me_flags & (CHANGEABLE | CHANGELESS); - return MDBX_SUCCESS; -} - -int __cold mdbx_env_set_userctx(MDBX_env *env, void *ctx) { - if (unlikely(!env)) - return MDBX_EINVAL; - env->me_userctx = ctx; - return MDBX_SUCCESS; -} - -void *__cold mdbx_env_get_userctx(MDBX_env *env) { - return env ? env->me_userctx : NULL; -} - -int __cold mdbx_env_set_assert(MDBX_env *env, MDBX_assert_func *func) { - if (unlikely(!env)) - return MDBX_EINVAL; -#if MDBX_DEBUG - env->me_assert_func = func; - return MDBX_SUCCESS; -#else - (void)func; - return MDBX_ENOSYS; -#endif -} - -int __cold mdbx_env_get_path(MDBX_env *env, const char **arg) { - if (unlikely(!env || !arg)) - return MDBX_EINVAL; - - *arg = env->me_path; - return MDBX_SUCCESS; -} - -int __cold mdbx_env_get_fd(MDBX_env *env, mdbx_filehandle_t *arg) { - if (unlikely(!env || !arg)) - return MDBX_EINVAL; - - *arg = env->me_fd; - return MDBX_SUCCESS; -} - -/* Common code for mdbx_dbi_stat() and mdbx_env_stat(). - * [in] env the environment to operate in. - * [in] db the MDBX_db record containing the stats to return. - * [out] arg the address of an MDBX_stat structure to receive the stats. - * Returns 0, this function always succeeds. */ -static int __cold mdbx_stat0(MDBX_env *env, MDBX_db *db, MDBX_stat *arg) { - arg->ms_psize = env->me_psize; - arg->ms_depth = db->md_depth; - arg->ms_branch_pages = db->md_branch_pages; - arg->ms_leaf_pages = db->md_leaf_pages; - arg->ms_overflow_pages = db->md_overflow_pages; - arg->ms_entries = db->md_entries; - return MDBX_SUCCESS; -} - -int __cold mdbx_env_stat(MDBX_env *env, MDBX_stat *arg, size_t bytes) { - MDBX_meta *meta; - - if (unlikely(env == NULL || arg == NULL)) - return MDBX_EINVAL; - if (unlikely(bytes != sizeof(MDBX_stat))) - return MDBX_EINVAL; - - meta = mdbx_meta_head(env); - return mdbx_stat0(env, &meta->mm_dbs[MAIN_DBI], arg); -} - -int __cold mdbx_env_info(MDBX_env *env, MDBX_envinfo *arg, size_t bytes) { - - if (unlikely(env == NULL || arg == NULL)) - return MDBX_EINVAL; - - if (bytes != sizeof(MDBX_envinfo)) - return MDBX_EINVAL; - - const MDBX_meta *const meta0 = METAPAGE(env, 0); - const MDBX_meta *const meta1 = METAPAGE(env, 1); - const MDBX_meta *const meta2 = METAPAGE(env, 2); - const MDBX_meta *meta; - do { - meta = mdbx_meta_head(env); - arg->mi_recent_txnid = mdbx_meta_txnid_fluid(env, meta); - arg->mi_meta0_txnid = mdbx_meta_txnid_fluid(env, meta0); - arg->mi_meta0_sign = meta0->mm_datasync_sign; - arg->mi_meta1_txnid = mdbx_meta_txnid_fluid(env, meta1); - arg->mi_meta1_sign = meta1->mm_datasync_sign; - arg->mi_meta2_txnid = mdbx_meta_txnid_fluid(env, meta2); - arg->mi_meta2_sign = meta2->mm_datasync_sign; - arg->mi_last_pgno = meta->mm_geo.next - 1; - arg->mi_geo.lower = pgno2bytes(env, meta->mm_geo.lower); - arg->mi_geo.upper = pgno2bytes(env, meta->mm_geo.upper); - arg->mi_geo.current = pgno2bytes(env, meta->mm_geo.now); - arg->mi_geo.shrink = pgno2bytes(env, meta->mm_geo.shrink); - arg->mi_geo.grow = pgno2bytes(env, meta->mm_geo.grow); - arg->mi_mapsize = env->me_mapsize; - mdbx_compiler_barrier(); - } while (unlikely(arg->mi_meta0_txnid != mdbx_meta_txnid_fluid(env, meta0) || - arg->mi_meta0_sign != meta0->mm_datasync_sign || - arg->mi_meta1_txnid != mdbx_meta_txnid_fluid(env, meta1) || - arg->mi_meta1_sign != meta1->mm_datasync_sign || - arg->mi_meta2_txnid != mdbx_meta_txnid_fluid(env, meta2) || - arg->mi_meta2_sign != meta2->mm_datasync_sign || - meta != mdbx_meta_head(env) || - arg->mi_recent_txnid != mdbx_meta_txnid_fluid(env, meta))); - - arg->mi_maxreaders = env->me_maxreaders; - arg->mi_numreaders = env->me_lck ? env->me_lck->mti_numreaders : INT32_MAX; - arg->mi_dxb_pagesize = env->me_psize; - arg->mi_sys_pagesize = env->me_os_psize; - - arg->mi_latter_reader_txnid = 0; - if (env->me_lck) { - MDBX_reader *r = env->me_lck->mti_readers; - arg->mi_latter_reader_txnid = arg->mi_recent_txnid; - for (unsigned i = 0; i < arg->mi_numreaders; ++i) { - if (r[i].mr_pid) { - const txnid_t txnid = r[i].mr_txnid; - if (arg->mi_latter_reader_txnid > txnid) - arg->mi_latter_reader_txnid = txnid; - } - } - } - - return MDBX_SUCCESS; -} - -static MDBX_cmp_func *mdbx_default_keycmp(unsigned flags) { - return (flags & MDBX_REVERSEKEY) ? mdbx_cmp_memnr : (flags & MDBX_INTEGERKEY) - ? mdbx_cmp_int_a2 - : mdbx_cmp_memn; -} - -static MDBX_cmp_func *mdbx_default_datacmp(unsigned flags) { - return !(flags & MDBX_DUPSORT) - ? 0 - : ((flags & MDBX_INTEGERDUP) - ? mdbx_cmp_int_ua - : ((flags & MDBX_REVERSEDUP) ? mdbx_cmp_memnr - : mdbx_cmp_memn)); -} - -static int mdbx_dbi_bind(MDBX_txn *txn, const MDBX_dbi dbi, unsigned user_flags, - MDBX_cmp_func *keycmp, MDBX_cmp_func *datacmp) { - /* LY: so, accepting only three cases for the table's flags: - * 1) user_flags and both comparators are zero - * = assume that a by-default mode/flags is requested for reading; - * 2) user_flags exactly the same - * = assume that the target mode/flags are requested properly; - * 3) user_flags differs, but table is empty and MDBX_CREATE is provided - * = assume that a properly create request with custom flags; - */ - if ((user_flags ^ txn->mt_dbs[dbi].md_flags) & PERSISTENT_FLAGS) { - /* flags ara differs, check other conditions */ - if (!user_flags && (!keycmp || keycmp == txn->mt_dbxs[dbi].md_cmp) && - (!datacmp || datacmp == txn->mt_dbxs[dbi].md_dcmp)) { - /* no comparators were provided and flags are zero, - * seems that is case #1 above */ - user_flags = txn->mt_dbs[dbi].md_flags; - } else if ((user_flags & MDBX_CREATE) && txn->mt_dbs[dbi].md_entries == 0) { - if (txn->mt_flags & MDBX_TXN_RDONLY) - return /* FIXME: return extended info */ MDBX_EACCESS; - /* make sure flags changes get committed */ - txn->mt_dbs[dbi].md_flags = user_flags & PERSISTENT_FLAGS; - txn->mt_flags |= MDBX_TXN_DIRTY; - } else { - return /* FIXME: return extended info */ MDBX_INCOMPATIBLE; - } - } - - if (!txn->mt_dbxs[dbi].md_cmp || MDBX_DEBUG) { - if (!keycmp) - keycmp = mdbx_default_keycmp(user_flags); - assert(!txn->mt_dbxs[dbi].md_cmp || txn->mt_dbxs[dbi].md_cmp == keycmp); - txn->mt_dbxs[dbi].md_cmp = keycmp; - } - - if (!txn->mt_dbxs[dbi].md_dcmp || MDBX_DEBUG) { - if (!datacmp) - datacmp = mdbx_default_datacmp(user_flags); - assert(!txn->mt_dbxs[dbi].md_dcmp || txn->mt_dbxs[dbi].md_dcmp == datacmp); - txn->mt_dbxs[dbi].md_dcmp = datacmp; - } - - return MDBX_SUCCESS; -} - -int mdbx_dbi_open_ex(MDBX_txn *txn, const char *table_name, unsigned user_flags, - MDBX_dbi *dbi, MDBX_cmp_func *keycmp, - MDBX_cmp_func *datacmp) { - if (unlikely(!txn || !dbi || (user_flags & ~VALID_FLAGS) != 0)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(txn->mt_flags & MDBX_TXN_BLOCKED)) - return MDBX_BAD_TXN; - - /* main table? */ - if (!table_name) { - *dbi = MAIN_DBI; - return mdbx_dbi_bind(txn, MAIN_DBI, user_flags, keycmp, datacmp); - } - - if (txn->mt_dbxs[MAIN_DBI].md_cmp == NULL) { - txn->mt_dbxs[MAIN_DBI].md_cmp = - mdbx_default_keycmp(txn->mt_dbs[MAIN_DBI].md_flags); - txn->mt_dbxs[MAIN_DBI].md_dcmp = - mdbx_default_datacmp(txn->mt_dbs[MAIN_DBI].md_flags); - } - - /* Is the DB already open? */ - size_t len = strlen(table_name); - MDBX_dbi scan, slot = txn->mt_numdbs; - for (scan = txn->mt_numdbs; --scan >= CORE_DBS;) { - if (!txn->mt_dbxs[scan].md_name.iov_len) { - /* Remember this free slot */ - slot = scan; - continue; - } - if (len == txn->mt_dbxs[scan].md_name.iov_len && - !strncmp(table_name, txn->mt_dbxs[scan].md_name.iov_base, len)) { - *dbi = scan; - return mdbx_dbi_bind(txn, scan, user_flags, keycmp, datacmp); - } - } - - /* Fail, if no free slot and max hit */ - MDBX_env *env = txn->mt_env; - if (unlikely(slot >= env->me_maxdbs)) - return MDBX_DBS_FULL; - - /* Cannot mix named table with some main-table flags */ - if (unlikely(txn->mt_dbs[MAIN_DBI].md_flags & - (MDBX_DUPSORT | MDBX_INTEGERKEY))) - return (user_flags & MDBX_CREATE) ? MDBX_INCOMPATIBLE : MDBX_NOTFOUND; - - /* Find the DB info */ - int exact = 0; - MDBX_val key, data; - key.iov_len = len; - key.iov_base = (void *)table_name; - MDBX_cursor mc; - mdbx_cursor_init(&mc, txn, MAIN_DBI, NULL); - int rc = mdbx_cursor_set(&mc, &key, &data, MDBX_SET, &exact); - if (unlikely(rc != MDBX_SUCCESS)) { - if (rc != MDBX_NOTFOUND || !(user_flags & MDBX_CREATE)) - return rc; - } else { - /* make sure this is actually a table */ - MDBX_node *node = NODEPTR(mc.mc_pg[mc.mc_top], mc.mc_ki[mc.mc_top]); - if (unlikely((node->mn_flags & (F_DUPDATA | F_SUBDATA)) != F_SUBDATA)) - return MDBX_INCOMPATIBLE; - } - - if (rc != MDBX_SUCCESS && unlikely(txn->mt_flags & MDBX_TXN_RDONLY)) - return MDBX_EACCESS; - - /* Done here so we cannot fail after creating a new DB */ - char *namedup = mdbx_strdup(table_name); - if (unlikely(!namedup)) - return MDBX_ENOMEM; - - int err = mdbx_fastmutex_acquire(&env->me_dbi_lock); - if (unlikely(err != MDBX_SUCCESS)) { - free(namedup); - return err; - } - - unsigned dbflag = DB_NEW | DB_VALID | DB_USRVALID; - if (unlikely(rc)) { - /* MDBX_NOTFOUND and MDBX_CREATE: Create new DB */ - assert(rc == MDBX_NOTFOUND); - MDBX_db db_dummy; - memset(&db_dummy, 0, sizeof(db_dummy)); - db_dummy.md_root = P_INVALID; - db_dummy.md_flags = user_flags & PERSISTENT_FLAGS; - data.iov_len = sizeof(db_dummy); - data.iov_base = &db_dummy; - WITH_CURSOR_TRACKING( - mc, - rc = mdbx_cursor_put(&mc, &key, &data, F_SUBDATA | MDBX_NOOVERWRITE)); - - if (unlikely(rc != MDBX_SUCCESS)) - goto bailout; - - dbflag |= DB_DIRTY; - } - - /* Got info, register DBI in this txn */ - txn->mt_dbxs[slot].md_name.iov_base = namedup; - txn->mt_dbxs[slot].md_name.iov_len = len; - txn->mt_dbxs[slot].md_cmp = nullptr; - txn->mt_dbxs[slot].md_dcmp = nullptr; - txn->mt_dbflags[slot] = (uint8_t)dbflag; - txn->mt_dbiseqs[slot] = (env->me_dbiseqs[slot] += 1); - - txn->mt_dbs[slot] = *(MDBX_db *)data.iov_base; - rc = mdbx_dbi_bind(txn, slot, user_flags, keycmp, datacmp); - if (unlikely(rc != MDBX_SUCCESS)) { - assert((dbflag & DB_DIRTY) == 0); - /* cleanup slot */ - txn->mt_dbxs[slot].md_name.iov_base = NULL; - txn->mt_dbxs[slot].md_name.iov_len = 0; - txn->mt_dbflags[slot] = 0; - bailout: - free(namedup); - } else { - *dbi = slot; - if (slot == txn->mt_numdbs) - txn->mt_numdbs++; - } - - mdbx_ensure(env, mdbx_fastmutex_release(&env->me_dbi_lock) == MDBX_SUCCESS); - return rc; -} - -int mdbx_dbi_open(MDBX_txn *txn, const char *table_name, unsigned table_flags, - MDBX_dbi *dbi) { - return mdbx_dbi_open_ex(txn, table_name, table_flags, dbi, nullptr, nullptr); -} - -int __cold mdbx_dbi_stat(MDBX_txn *txn, MDBX_dbi dbi, MDBX_stat *arg, - size_t bytes) { - if (unlikely(!arg || !txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_VALID))) - return MDBX_EINVAL; - - if (unlikely(bytes != sizeof(MDBX_stat))) - return MDBX_EINVAL; - - if (unlikely(txn->mt_flags & MDBX_TXN_BLOCKED)) - return MDBX_BAD_TXN; - - if (unlikely(txn->mt_dbflags[dbi] & DB_STALE)) { - MDBX_cursor mc; - MDBX_xcursor mx; - /* Stale, must read the DB's root. cursor_init does it for us. */ - mdbx_cursor_init(&mc, txn, dbi, &mx); - } - return mdbx_stat0(txn->mt_env, &txn->mt_dbs[dbi], arg); -} - -static int mdbx_dbi_close_locked(MDBX_env *env, MDBX_dbi dbi) { - if (unlikely(dbi < CORE_DBS || dbi >= env->me_maxdbs)) - return MDBX_EINVAL; - - char *ptr = env->me_dbxs[dbi].md_name.iov_base; - /* If there was no name, this was already closed */ - if (unlikely(!ptr)) - return MDBX_BAD_DBI; - - env->me_dbxs[dbi].md_name.iov_base = NULL; - env->me_dbxs[dbi].md_name.iov_len = 0; - env->me_dbflags[dbi] = 0; - env->me_dbiseqs[dbi]++; - free(ptr); - return MDBX_SUCCESS; -} - -int mdbx_dbi_close(MDBX_env *env, MDBX_dbi dbi) { - if (unlikely(dbi < CORE_DBS || dbi >= env->me_maxdbs)) - return MDBX_EINVAL; - - int rc = mdbx_fastmutex_acquire(&env->me_dbi_lock); - if (likely(rc == MDBX_SUCCESS)) { - rc = mdbx_dbi_close_locked(env, dbi); - mdbx_ensure(env, mdbx_fastmutex_release(&env->me_dbi_lock) == MDBX_SUCCESS); - } - return rc; -} - -int mdbx_dbi_flags_ex(MDBX_txn *txn, MDBX_dbi dbi, unsigned *flags, - unsigned *state) { - if (unlikely(!txn || !flags || !state)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_VALID))) - return MDBX_EINVAL; - - *flags = txn->mt_dbs[dbi].md_flags & PERSISTENT_FLAGS; - *state = txn->mt_dbflags[dbi] & (DB_NEW | DB_DIRTY | DB_STALE); - - return MDBX_SUCCESS; -} - -int mdbx_dbi_flags(MDBX_txn *txn, MDBX_dbi dbi, unsigned *flags) { - unsigned state; - return mdbx_dbi_flags_ex(txn, dbi, flags, &state); -} - -/* Add all the DB's pages to the free list. - * [in] mc Cursor on the DB to free. - * [in] subs non-Zero to check for sub-DBs in this DB. - * Returns 0 on success, non-zero on failure. */ -static int mdbx_drop0(MDBX_cursor *mc, int subs) { - int rc; - - rc = mdbx_page_search(mc, NULL, MDBX_PS_FIRST); - if (likely(rc == MDBX_SUCCESS)) { - MDBX_txn *txn = mc->mc_txn; - MDBX_node *ni; - MDBX_cursor mx; - unsigned i; - - /* DUPSORT sub-DBs have no ovpages/DBs. Omit scanning leaves. - * This also avoids any P_LEAF2 pages, which have no nodes. - * Also if the DB doesn't have sub-DBs and has no overflow - * pages, omit scanning leaves. */ - if ((mc->mc_flags & C_SUB) || (!subs && !mc->mc_db->md_overflow_pages)) - mdbx_cursor_pop(mc); - - mdbx_cursor_copy(mc, &mx); - while (mc->mc_snum > 0) { - MDBX_page *mp = mc->mc_pg[mc->mc_top]; - unsigned n = NUMKEYS(mp); - if (IS_LEAF(mp)) { - for (i = 0; i < n; i++) { - ni = NODEPTR(mp, i); - if (ni->mn_flags & F_BIGDATA) { - MDBX_page *omp; - pgno_t pg; - memcpy(&pg, NODEDATA(ni), sizeof(pg)); - rc = mdbx_page_get(mc, pg, &omp, NULL); - if (unlikely(rc)) - goto done; - mdbx_cassert(mc, IS_OVERFLOW(omp)); - rc = - mdbx_pnl_append_range(&txn->mt_befree_pages, pg, omp->mp_pages); - if (unlikely(rc)) - goto done; - mc->mc_db->md_overflow_pages -= omp->mp_pages; - if (!mc->mc_db->md_overflow_pages && !subs) - break; - } else if (subs && (ni->mn_flags & F_SUBDATA)) { - mdbx_xcursor_init1(mc, ni); - rc = mdbx_drop0(&mc->mc_xcursor->mx_cursor, 0); - if (unlikely(rc)) - goto done; - } - } - if (!subs && !mc->mc_db->md_overflow_pages) - goto pop; - } else { - if (unlikely((rc = mdbx_pnl_need(&txn->mt_befree_pages, n)) != 0)) - goto done; - for (i = 0; i < n; i++) { - pgno_t pg; - ni = NODEPTR(mp, i); - pg = NODEPGNO(ni); - /* free it */ - mdbx_pnl_xappend(txn->mt_befree_pages, pg); - } - } - if (!mc->mc_top) - break; - mdbx_cassert(mc, i <= UINT16_MAX); - mc->mc_ki[mc->mc_top] = (indx_t)i; - rc = mdbx_cursor_sibling(mc, 1); - if (rc) { - if (unlikely(rc != MDBX_NOTFOUND)) - goto done; - /* no more siblings, go back to beginning - * of previous level. */ - pop: - mdbx_cursor_pop(mc); - mc->mc_ki[0] = 0; - for (i = 1; i < mc->mc_snum; i++) { - mc->mc_ki[i] = 0; - mc->mc_pg[i] = mx.mc_pg[i]; - } - } - } - /* free it */ - rc = mdbx_pnl_append(&txn->mt_befree_pages, mc->mc_db->md_root); - done: - if (unlikely(rc)) - txn->mt_flags |= MDBX_TXN_ERROR; - } else if (rc == MDBX_NOTFOUND) { - rc = MDBX_SUCCESS; - } - mc->mc_flags &= ~C_INITIALIZED; - return rc; -} - -int mdbx_drop(MDBX_txn *txn, MDBX_dbi dbi, int del) { - if (unlikely(1 < (unsigned)del || !txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID))) - return MDBX_EINVAL; - - if (unlikely(TXN_DBI_CHANGED(txn, dbi))) - return MDBX_BAD_DBI; - - if (unlikely(F_ISSET(txn->mt_flags, MDBX_TXN_RDONLY))) - return MDBX_EACCESS; - - MDBX_cursor *mc; - int rc = mdbx_cursor_open(txn, dbi, &mc); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - - MDBX_env *env = txn->mt_env; - rc = mdbx_fastmutex_acquire(&env->me_dbi_lock); - if (unlikely(rc != MDBX_SUCCESS)) { - mdbx_cursor_close(mc); - return rc; - } - - if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID))) { - rc = MDBX_EINVAL; - goto bailout; - } - - if (unlikely(TXN_DBI_CHANGED(txn, dbi))) { - rc = MDBX_BAD_DBI; - goto bailout; - } - - rc = mdbx_drop0(mc, mc->mc_db->md_flags & MDBX_DUPSORT); - /* Invalidate the dropped DB's cursors */ - for (MDBX_cursor *m2 = txn->mt_cursors[dbi]; m2; m2 = m2->mc_next) - m2->mc_flags &= ~(C_INITIALIZED | C_EOF); - if (unlikely(rc)) - goto bailout; - - /* Can't delete the main DB */ - if (del && dbi >= CORE_DBS) { - rc = mdbx_del0(txn, MAIN_DBI, &mc->mc_dbx->md_name, NULL, F_SUBDATA); - if (likely(!rc)) { - txn->mt_dbflags[dbi] = DB_STALE; - mdbx_dbi_close_locked(env, dbi); - } else { - txn->mt_flags |= MDBX_TXN_ERROR; - } - } else { - /* reset the DB record, mark it dirty */ - txn->mt_dbflags[dbi] |= DB_DIRTY; - txn->mt_dbs[dbi].md_depth = 0; - txn->mt_dbs[dbi].md_branch_pages = 0; - txn->mt_dbs[dbi].md_leaf_pages = 0; - txn->mt_dbs[dbi].md_overflow_pages = 0; - txn->mt_dbs[dbi].md_entries = 0; - txn->mt_dbs[dbi].md_root = P_INVALID; - txn->mt_dbs[dbi].md_seq = 0; - - txn->mt_flags |= MDBX_TXN_DIRTY; - } - -bailout: - mdbx_cursor_close(mc); - mdbx_ensure(env, mdbx_fastmutex_release(&env->me_dbi_lock) == MDBX_SUCCESS); - return rc; -} - -int mdbx_set_compare(MDBX_txn *txn, MDBX_dbi dbi, MDBX_cmp_func *cmp) { - if (unlikely(!txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID))) - return MDBX_EINVAL; - - txn->mt_dbxs[dbi].md_cmp = cmp; - return MDBX_SUCCESS; -} - -int mdbx_set_dupsort(MDBX_txn *txn, MDBX_dbi dbi, MDBX_cmp_func *cmp) { - if (unlikely(!txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID))) - return MDBX_EINVAL; - - txn->mt_dbxs[dbi].md_dcmp = cmp; - return MDBX_SUCCESS; -} - -int __cold mdbx_reader_list(MDBX_env *env, MDBX_msg_func *func, void *ctx) { - char buf[64]; - int rc = 0, first = 1; - - if (unlikely(!env || !func)) - return -MDBX_EINVAL; - - if (unlikely(env->me_signature != MDBX_ME_SIGNATURE)) - return MDBX_EBADSIGN; - - const MDBX_lockinfo *const lck = env->me_lck; - const unsigned snap_nreaders = lck->mti_numreaders; - for (unsigned i = 0; i < snap_nreaders; i++) { - if (lck->mti_readers[i].mr_pid) { - const txnid_t txnid = lck->mti_readers[i].mr_txnid; - if (txnid == ~(txnid_t)0) - snprintf(buf, sizeof(buf), "%10" PRIuPTR " %" PRIxPTR " -\n", - (uintptr_t)lck->mti_readers[i].mr_pid, - (uintptr_t)lck->mti_readers[i].mr_tid); - else - snprintf(buf, sizeof(buf), "%10" PRIuPTR " %" PRIxPTR " %" PRIaTXN "\n", - (uintptr_t)lck->mti_readers[i].mr_pid, - (uintptr_t)lck->mti_readers[i].mr_tid, txnid); - - if (first) { - first = 0; - rc = func(" pid thread txnid\n", ctx); - if (rc < 0) - break; - } - rc = func(buf, ctx); - if (rc < 0) - break; - } - } - if (first) - rc = func("(no active readers)\n", ctx); - - return rc; -} - -/* Insert pid into list if not already present. - * return -1 if already present. */ -static int __cold mdbx_pid_insert(mdbx_pid_t *ids, mdbx_pid_t pid) { - /* binary search of pid in list */ - unsigned base = 0; - unsigned cursor = 1; - int val = 0; - unsigned n = ids[0]; - - while (n > 0) { - unsigned pivot = n >> 1; - cursor = base + pivot + 1; - val = pid - ids[cursor]; - - if (val < 0) { - n = pivot; - } else if (val > 0) { - base = cursor; - n -= pivot + 1; - } else { - /* found, so it's a duplicate */ - return -1; - } - } - - if (val > 0) - ++cursor; - - ids[0]++; - for (n = ids[0]; n > cursor; n--) - ids[n] = ids[n - 1]; - ids[n] = pid; - return 0; -} - -int __cold mdbx_reader_check(MDBX_env *env, int *dead) { - if (unlikely(!env || env->me_signature != MDBX_ME_SIGNATURE)) - return MDBX_EINVAL; - if (dead) - *dead = 0; - return mdbx_reader_check0(env, false, dead); -} - -/* Return: - * MDBX_RESULT_TRUE - done and mutex recovered - * MDBX_SUCCESS - done - * Otherwise errcode. */ -int __cold mdbx_reader_check0(MDBX_env *env, int rdt_locked, int *dead) { - assert(rdt_locked >= 0); - - if (unlikely(env->me_pid != mdbx_getpid())) { - env->me_flags |= MDBX_FATAL_ERROR; - return MDBX_PANIC; - } - - MDBX_lockinfo *const lck = env->me_lck; - const unsigned snap_nreaders = lck->mti_numreaders; - mdbx_pid_t *pids = alloca((snap_nreaders + 1) * sizeof(mdbx_pid_t)); - pids[0] = 0; - - int rc = MDBX_SUCCESS, count = 0; - for (unsigned i = 0; i < snap_nreaders; i++) { - const mdbx_pid_t pid = lck->mti_readers[i].mr_pid; - if (pid == 0) - continue /* skip empty */; - if (pid == env->me_pid) - continue /* skip self */; - if (mdbx_pid_insert(pids, pid) != 0) - continue /* such pid already processed */; - - int err = mdbx_rpid_check(env, pid); - if (err == MDBX_RESULT_TRUE) - continue /* reader is live */; - - if (err != MDBX_SUCCESS) { - rc = err; - break /* mdbx_rpid_check() failed */; - } - - /* stale reader found */ - if (!rdt_locked) { - err = mdbx_rdt_lock(env); - if (MDBX_IS_ERROR(err)) { - rc = err; - break; - } - - rdt_locked = -1; - if (err == MDBX_RESULT_TRUE) { - /* mutex recovered, the mdbx_mutex_failed() checked all readers */ - rc = MDBX_RESULT_TRUE; - break; - } - - /* a other process may have clean and reused slot, recheck */ - if (lck->mti_readers[i].mr_pid != pid) - continue; - - err = mdbx_rpid_check(env, pid); - if (MDBX_IS_ERROR(err)) { - rc = err; - break; - } - - if (err != MDBX_SUCCESS) - continue /* the race with other process, slot reused */; - } - - /* clean it */ - for (unsigned j = i; j < snap_nreaders; j++) { - if (lck->mti_readers[j].mr_pid == pid) { - mdbx_debug("clear stale reader pid %" PRIuPTR " txn %" PRIaTXN "", - (size_t)pid, lck->mti_readers[j].mr_txnid); - lck->mti_readers[j].mr_pid = 0; - lck->mti_readers_refresh_flag = true; - count++; - } - } - } - - if (rdt_locked < 0) - mdbx_rdt_unlock(env); - - if (dead) - *dead = count; - return rc; -} - -int __cold mdbx_setup_debug(int flags, MDBX_debug_func *logger) { - unsigned ret = mdbx_runtime_flags; - mdbx_runtime_flags = flags; - -#ifdef __linux__ - if (flags & MDBX_DBG_DUMP) { - int core_filter_fd = open("/proc/self/coredump_filter", O_TRUNC | O_RDWR); - if (core_filter_fd >= 0) { - char buf[32]; - const unsigned r = pread(core_filter_fd, buf, sizeof(buf), 0); - if (r > 0 && r < sizeof(buf)) { - buf[r] = 0; - unsigned long mask = strtoul(buf, NULL, 16); - if (mask != ULONG_MAX) { - mask |= 1 << 3 /* Dump file-backed shared mappings */; - mask |= 1 << 6 /* Dump shared huge pages */; - mask |= 1 << 8 /* Dump shared DAX pages */; - unsigned w = snprintf(buf, sizeof(buf), "0x%lx\n", mask); - if (w > 0 && w < sizeof(buf)) { - w = pwrite(core_filter_fd, buf, w, 0); - (void)w; - } - } - } - close(core_filter_fd); - } - } -#endif /* __linux__ */ - - mdbx_debug_logger = logger; - return ret; -} - -static txnid_t __cold mdbx_oomkick(MDBX_env *env, const txnid_t laggard) { - mdbx_debug("DB size maxed out"); - - int retry; - for (retry = 0; retry < INT_MAX; ++retry) { - txnid_t oldest = mdbx_reclaiming_detent(env); - mdbx_assert(env, oldest < env->me_txn0->mt_txnid); - mdbx_assert(env, oldest >= laggard); - mdbx_assert(env, oldest >= env->me_oldest[0]); - if (oldest == laggard) - return oldest; - - if (MDBX_IS_ERROR(mdbx_reader_check0(env, false, NULL))) - break; - - MDBX_reader *const rtbl = env->me_lck->mti_readers; - MDBX_reader *asleep = nullptr; - for (int i = env->me_lck->mti_numreaders; --i >= 0;) { - if (rtbl[i].mr_pid) { - mdbx_jitter4testing(true); - const txnid_t snap = rtbl[i].mr_txnid; - if (oldest > snap && laggard <= /* ignore pending updates */ snap) { - oldest = snap; - asleep = &rtbl[i]; - } - } - } - - if (laggard < oldest || !asleep) { - if (retry && env->me_oom_func) { - /* LY: notify end of oom-loop */ - const txnid_t gap = oldest - laggard; - env->me_oom_func(env, 0, 0, laggard, - (gap < UINT_MAX) ? (unsigned)gap : UINT_MAX, -retry); - } - mdbx_notice("oom-kick: update oldest %" PRIaTXN " -> %" PRIaTXN, - env->me_oldest[0], oldest); - mdbx_assert(env, env->me_oldest[0] <= oldest); - return env->me_oldest[0] = oldest; - } - - mdbx_tid_t tid; - mdbx_pid_t pid; - int rc; - - if (!env->me_oom_func) - break; - - pid = asleep->mr_pid; - tid = asleep->mr_tid; - if (asleep->mr_txnid != laggard || pid <= 0) - continue; - - const txnid_t gap = - mdbx_meta_txnid_stable(env, mdbx_meta_head(env)) - laggard; - rc = env->me_oom_func(env, pid, tid, laggard, - (gap < UINT_MAX) ? (unsigned)gap : UINT_MAX, retry); - if (rc < 0) - break; - - if (rc) { - asleep->mr_txnid = ~(txnid_t)0; - env->me_lck->mti_readers_refresh_flag = true; - if (rc > 1) { - asleep->mr_tid = 0; - asleep->mr_pid = 0; - mdbx_coherent_barrier(); - } - } - } - - if (retry && env->me_oom_func) { - /* LY: notify end of oom-loop */ - env->me_oom_func(env, 0, 0, laggard, 0, -retry); - } - return mdbx_find_oldest(env->me_txn); -} - -int __cold mdbx_env_set_syncbytes(MDBX_env *env, size_t bytes) { - if (unlikely(!env)) - return MDBX_EINVAL; - - if (unlikely(env->me_signature != MDBX_ME_SIGNATURE)) - return MDBX_EBADSIGN; - - env->me_sync_threshold = bytes; - return env->me_map ? mdbx_env_sync(env, 0) : MDBX_SUCCESS; -} - -int __cold mdbx_env_set_oomfunc(MDBX_env *env, MDBX_oom_func *oomfunc) { - if (unlikely(!env)) - return MDBX_EINVAL; - - if (unlikely(env->me_signature != MDBX_ME_SIGNATURE)) - return MDBX_EBADSIGN; - - env->me_oom_func = oomfunc; - return MDBX_SUCCESS; -} - -MDBX_oom_func *__cold mdbx_env_get_oomfunc(MDBX_env *env) { - return likely(env && env->me_signature == MDBX_ME_SIGNATURE) - ? env->me_oom_func - : NULL; -} - -#ifdef __SANITIZE_THREAD__ -/* LY: avoid tsan-trap by me_txn, mm_last_pg and mt_next_pgno */ -__attribute__((no_sanitize_thread, noinline)) -#endif -int mdbx_txn_straggler(MDBX_txn *txn, int *percent) -{ - if (unlikely(!txn)) - return -MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - MDBX_env *env = txn->mt_env; - if (unlikely((txn->mt_flags & MDBX_RDONLY) == 0)) { - if (percent) - *percent = - (int)((txn->mt_next_pgno * UINT64_C(100) + txn->mt_end_pgno / 2) / - txn->mt_end_pgno); - return -1; - } - - txnid_t recent; - MDBX_meta *meta; - do { - meta = mdbx_meta_head(env); - recent = mdbx_meta_txnid_fluid(env, meta); - if (percent) { - const pgno_t maxpg = meta->mm_geo.now; - *percent = (int)((meta->mm_geo.next * UINT64_C(100) + maxpg / 2) / maxpg); - } - } while (unlikely(recent != mdbx_meta_txnid_fluid(env, meta))); - - txnid_t lag = recent - txn->mt_ro_reader->mr_txnid; - return (lag > INT_MAX) ? INT_MAX : (int)lag; -} - -typedef struct mdbx_walk_ctx { - MDBX_txn *mw_txn; - void *mw_user; - MDBX_pgvisitor_func *mw_visitor; -} mdbx_walk_ctx_t; - -/* Depth-first tree traversal. */ -static int __cold mdbx_env_walk(mdbx_walk_ctx_t *ctx, const char *dbi, - pgno_t pg, int deep) { - MDBX_page *mp; - int rc, i, nkeys; - size_t header_size, unused_size, payload_size, align_bytes; - const char *type; - - if (pg == P_INVALID) - return MDBX_SUCCESS; /* empty db */ - - MDBX_cursor mc; - memset(&mc, 0, sizeof(mc)); - mc.mc_snum = 1; - mc.mc_txn = ctx->mw_txn; - - rc = mdbx_page_get(&mc, pg, &mp, NULL); - if (rc) - return rc; - if (pg != mp->mp_pgno) - return MDBX_CORRUPTED; - - nkeys = NUMKEYS(mp); - header_size = IS_LEAF2(mp) ? PAGEHDRSZ : PAGEHDRSZ + mp->mp_lower; - unused_size = SIZELEFT(mp); - payload_size = 0; - - /* LY: Don't use mask here, e.g bitwise - * (P_BRANCH|P_LEAF|P_LEAF2|P_META|P_OVERFLOW|P_SUBP). - * Pages should not me marked dirty/loose or otherwise. */ - switch (mp->mp_flags) { - case P_BRANCH: - type = "branch"; - if (nkeys < 1) - return MDBX_CORRUPTED; - break; - case P_LEAF: - type = "leaf"; - break; - case P_LEAF | P_SUBP: - type = "dupsort-subleaf"; - break; - case P_LEAF | P_LEAF2: - type = "dupfixed-leaf"; - break; - case P_LEAF | P_LEAF2 | P_SUBP: - type = "dupsort-dupfixed-subleaf"; - break; - case P_META: - case P_OVERFLOW: - __fallthrough; - default: - return MDBX_CORRUPTED; - } - - for (align_bytes = i = 0; i < nkeys; - align_bytes += ((payload_size + align_bytes) & 1), i++) { - MDBX_node *node; - - if (IS_LEAF2(mp)) { - /* LEAF2 pages have no mp_ptrs[] or node headers */ - payload_size += mp->mp_leaf2_ksize; - continue; - } - - node = NODEPTR(mp, i); - payload_size += NODESIZE + node->mn_ksize; - - if (IS_BRANCH(mp)) { - rc = mdbx_env_walk(ctx, dbi, NODEPGNO(node), deep); - if (rc) - return rc; - continue; - } - - assert(IS_LEAF(mp)); - if (node->mn_flags & F_BIGDATA) { - MDBX_page *omp; - pgno_t *opg; - size_t over_header, over_payload, over_unused; - - payload_size += sizeof(pgno_t); - opg = NODEDATA(node); - rc = mdbx_page_get(&mc, *opg, &omp, NULL); - if (rc) - return rc; - if (*opg != omp->mp_pgno) - return MDBX_CORRUPTED; - /* LY: Don't use mask here, e.g bitwise - * (P_BRANCH|P_LEAF|P_LEAF2|P_META|P_OVERFLOW|P_SUBP). - * Pages should not me marked dirty/loose or otherwise. */ - if (P_OVERFLOW != omp->mp_flags) - return MDBX_CORRUPTED; - - over_header = PAGEHDRSZ; - over_payload = NODEDSZ(node); - over_unused = pgno2bytes(ctx->mw_txn->mt_env, omp->mp_pages) - - over_payload - over_header; - - rc = ctx->mw_visitor(*opg, omp->mp_pages, ctx->mw_user, dbi, - "overflow-data", 1, over_payload, over_header, - over_unused); - if (rc) - return rc; - continue; - } - - payload_size += NODEDSZ(node); - if (node->mn_flags & F_SUBDATA) { - MDBX_db *db = NODEDATA(node); - char *name = NULL; - - if (!(node->mn_flags & F_DUPDATA)) { - name = NODEKEY(node); - ptrdiff_t namelen = (char *)db - name; - name = memcpy(alloca(namelen + 1), name, namelen); - name[namelen] = 0; - } - rc = mdbx_env_walk(ctx, (name && name[0]) ? name : dbi, db->md_root, - deep + 1); - if (rc) - return rc; - } - } - - return ctx->mw_visitor(mp->mp_pgno, 1, ctx->mw_user, dbi, type, nkeys, - payload_size, header_size, unused_size + align_bytes); -} - -int __cold mdbx_env_pgwalk(MDBX_txn *txn, MDBX_pgvisitor_func *visitor, - void *user) { - if (unlikely(!txn)) - return MDBX_BAD_TXN; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - mdbx_walk_ctx_t ctx; - ctx.mw_txn = txn; - ctx.mw_user = user; - ctx.mw_visitor = visitor; - - int rc = visitor(0, NUM_METAS, user, "meta", "meta", NUM_METAS, - sizeof(MDBX_meta) * NUM_METAS, PAGEHDRSZ * NUM_METAS, - (txn->mt_env->me_psize - sizeof(MDBX_meta) - PAGEHDRSZ) * - NUM_METAS); - if (!rc) - rc = mdbx_env_walk(&ctx, "free", txn->mt_dbs[FREE_DBI].md_root, 0); - if (!rc) - rc = mdbx_env_walk(&ctx, "main", txn->mt_dbs[MAIN_DBI].md_root, 0); - if (!rc) - rc = visitor(P_INVALID, 0, user, NULL, NULL, 0, 0, 0, 0); - return rc; -} - -int mdbx_canary_put(MDBX_txn *txn, const mdbx_canary *canary) { - if (unlikely(!txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(txn->mt_flags & MDBX_TXN_BLOCKED)) - return MDBX_BAD_TXN; - - if (unlikely(F_ISSET(txn->mt_flags, MDBX_TXN_RDONLY))) - return MDBX_EACCESS; - - if (likely(canary)) { - if (txn->mt_canary.x == canary->x && txn->mt_canary.y == canary->y && - txn->mt_canary.z == canary->z) - return MDBX_SUCCESS; - txn->mt_canary.x = canary->x; - txn->mt_canary.y = canary->y; - txn->mt_canary.z = canary->z; - } - txn->mt_canary.v = txn->mt_txnid; - - if ((txn->mt_flags & MDBX_TXN_DIRTY) == 0) { - MDBX_env *env = txn->mt_env; - txn->mt_flags |= MDBX_TXN_DIRTY; - env->me_sync_pending += env->me_psize; - } - - return MDBX_SUCCESS; -} - -int mdbx_canary_get(MDBX_txn *txn, mdbx_canary *canary) { - if (unlikely(txn == NULL || canary == NULL)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - *canary = txn->mt_canary; - return MDBX_SUCCESS; -} - -int mdbx_cursor_on_first(MDBX_cursor *mc) { - if (unlikely(mc == NULL)) - return MDBX_EINVAL; - - if (unlikely(mc->mc_signature != MDBX_MC_SIGNATURE)) - return MDBX_EBADSIGN; - - if (!(mc->mc_flags & C_INITIALIZED)) - return MDBX_RESULT_FALSE; - - for (unsigned i = 0; i < mc->mc_snum; ++i) { - if (mc->mc_ki[i]) - return MDBX_RESULT_FALSE; - } - - return MDBX_RESULT_TRUE; -} - -int mdbx_cursor_on_last(MDBX_cursor *mc) { - if (unlikely(mc == NULL)) - return MDBX_EINVAL; - - if (unlikely(mc->mc_signature != MDBX_MC_SIGNATURE)) - return MDBX_EBADSIGN; - - if (!(mc->mc_flags & C_INITIALIZED)) - return MDBX_RESULT_FALSE; - - for (unsigned i = 0; i < mc->mc_snum; ++i) { - unsigned nkeys = NUMKEYS(mc->mc_pg[i]); - if (mc->mc_ki[i] < nkeys - 1) - return MDBX_RESULT_FALSE; - } - - return MDBX_RESULT_TRUE; -} - -int mdbx_cursor_eof(MDBX_cursor *mc) { - if (unlikely(mc == NULL)) - return MDBX_EINVAL; - - if (unlikely(mc->mc_signature != MDBX_MC_SIGNATURE)) - return MDBX_EBADSIGN; - - if ((mc->mc_flags & C_INITIALIZED) == 0) - return MDBX_RESULT_TRUE; - - if (mc->mc_snum == 0) - return MDBX_RESULT_TRUE; - - if ((mc->mc_flags & C_EOF) && - mc->mc_ki[mc->mc_top] >= NUMKEYS(mc->mc_pg[mc->mc_top])) - return MDBX_RESULT_TRUE; - - return MDBX_RESULT_FALSE; -} - -static int mdbx_is_samedata(const MDBX_val *a, const MDBX_val *b) { - return a->iov_len == b->iov_len && - memcmp(a->iov_base, b->iov_base, a->iov_len) == 0; -} - -/* Позволяет обновить или удалить существующую запись с получением - * в old_data предыдущего значения данных. При этом если new_data равен - * нулю, то выполняется удаление, иначе обновление/вставка. - * - * Текущее значение может находиться в уже измененной (грязной) странице. - * В этом случае страница будет перезаписана при обновлении, а само старое - * значение утрачено. Поэтому исходно в old_data должен быть передан - * дополнительный буфер для копирования старого значения. - * Если переданный буфер слишком мал, то функция вернет -1, установив - * old_data->iov_len в соответствующее значение. - * - * Для не-уникальных ключей также возможен второй сценарий использования, - * когда посредством old_data из записей с одинаковым ключом для - * удаления/обновления выбирается конкретная. Для выбора этого сценария - * во flags следует одновременно указать MDBX_CURRENT и MDBX_NOOVERWRITE. - * Именно эта комбинация выбрана, так как она лишена смысла, и этим позволяет - * идентифицировать запрос такого сценария. - * - * Функция может быть замещена соответствующими операциями с курсорами - * после двух доработок (TODO): - * - внешняя аллокация курсоров, в том числе на стеке (без malloc). - * - получения статуса страницы по адресу (знать о P_DIRTY). - */ -int mdbx_replace(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key, MDBX_val *new_data, - MDBX_val *old_data, unsigned flags) { - if (unlikely(!key || !old_data || !txn || old_data == new_data)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(old_data->iov_base == NULL && old_data->iov_len)) - return MDBX_EINVAL; - - if (unlikely(new_data == NULL && !(flags & MDBX_CURRENT))) - return MDBX_EINVAL; - - if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID))) - return MDBX_EINVAL; - - if (unlikely(flags & - ~(MDBX_NOOVERWRITE | MDBX_NODUPDATA | MDBX_RESERVE | - MDBX_APPEND | MDBX_APPENDDUP | MDBX_CURRENT))) - return MDBX_EINVAL; - - if (unlikely(txn->mt_flags & (MDBX_TXN_RDONLY | MDBX_TXN_BLOCKED))) - return (txn->mt_flags & MDBX_TXN_RDONLY) ? MDBX_EACCESS : MDBX_BAD_TXN; - - MDBX_cursor mc; - MDBX_xcursor mx; - mdbx_cursor_init(&mc, txn, dbi, &mx); - mc.mc_next = txn->mt_cursors[dbi]; - txn->mt_cursors[dbi] = &mc; - - int rc; - MDBX_val present_key = *key; - if (F_ISSET(flags, MDBX_CURRENT | MDBX_NOOVERWRITE)) { - /* в old_data значение для выбора конкретного дубликата */ - if (unlikely(!(txn->mt_dbs[dbi].md_flags & MDBX_DUPSORT))) { - rc = MDBX_EINVAL; - goto bailout; - } - - /* убираем лишний бит, он был признаком запрошенного режима */ - flags -= MDBX_NOOVERWRITE; - - rc = mdbx_cursor_get(&mc, &present_key, old_data, MDBX_GET_BOTH); - if (rc != MDBX_SUCCESS) - goto bailout; - - if (new_data) { - /* обновление конкретного дубликата */ - if (mdbx_is_samedata(old_data, new_data)) - /* если данные совпадают, то ничего делать не надо */ - goto bailout; - } - } else { - /* в old_data буфер для сохранения предыдущего значения */ - if (unlikely(new_data && old_data->iov_base == new_data->iov_base)) - return MDBX_EINVAL; - MDBX_val present_data; - rc = mdbx_cursor_get(&mc, &present_key, &present_data, MDBX_SET_KEY); - if (unlikely(rc != MDBX_SUCCESS)) { - old_data->iov_base = NULL; - old_data->iov_len = rc; - if (rc != MDBX_NOTFOUND || (flags & MDBX_CURRENT)) - goto bailout; - } else if (flags & MDBX_NOOVERWRITE) { - rc = MDBX_KEYEXIST; - *old_data = present_data; - goto bailout; - } else { - MDBX_page *page = mc.mc_pg[mc.mc_top]; - if (txn->mt_dbs[dbi].md_flags & MDBX_DUPSORT) { - if (flags & MDBX_CURRENT) { - /* для не-уникальных ключей позволяем update/delete только если ключ - * один */ - MDBX_node *leaf = NODEPTR(page, mc.mc_ki[mc.mc_top]); - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - mdbx_tassert(txn, XCURSOR_INITED(&mc) && - mc.mc_xcursor->mx_db.md_entries > 1); - if (mc.mc_xcursor->mx_db.md_entries > 1) { - rc = MDBX_EMULTIVAL; - goto bailout; - } - } - /* если данные совпадают, то ничего делать не надо */ - if (new_data && mdbx_is_samedata(&present_data, new_data)) { - *old_data = *new_data; - goto bailout; - } - /* В оригинальной LMDB фладок MDBX_CURRENT здесь приведет - * к замене данных без учета MDBX_DUPSORT сортировки, - * но здесь это в любом случае допустимо, так как мы - * проверили что для ключа есть только одно значение. */ - } else if ((flags & MDBX_NODUPDATA) && - mdbx_is_samedata(&present_data, new_data)) { - /* если данные совпадают и установлен MDBX_NODUPDATA */ - rc = MDBX_KEYEXIST; - goto bailout; - } - } else { - /* если данные совпадают, то ничего делать не надо */ - if (new_data && mdbx_is_samedata(&present_data, new_data)) { - *old_data = *new_data; - goto bailout; - } - flags |= MDBX_CURRENT; - } - - if (page->mp_flags & P_DIRTY) { - if (unlikely(old_data->iov_len < present_data.iov_len)) { - old_data->iov_base = NULL; - old_data->iov_len = present_data.iov_len; - rc = MDBX_RESULT_TRUE; - goto bailout; - } - memcpy(old_data->iov_base, present_data.iov_base, present_data.iov_len); - old_data->iov_len = present_data.iov_len; - } else { - *old_data = present_data; - } - } - } - - if (likely(new_data)) - rc = mdbx_cursor_put(&mc, key, new_data, flags); - else - rc = mdbx_cursor_del(&mc, 0); - -bailout: - txn->mt_cursors[dbi] = mc.mc_next; - return rc; -} - -int mdbx_get_ex(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key, MDBX_val *data, - size_t *values_count) { - DKBUF; - mdbx_debug("===> get db %u key [%s]", dbi, DKEY(key)); - - if (unlikely(!key || !data || !txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID))) - return MDBX_EINVAL; - - if (unlikely(txn->mt_flags & MDBX_TXN_BLOCKED)) - return MDBX_BAD_TXN; - - MDBX_cursor mc; - MDBX_xcursor mx; - mdbx_cursor_init(&mc, txn, dbi, &mx); - - int exact = 0; - int rc = mdbx_cursor_set(&mc, key, data, MDBX_SET_KEY, &exact); - if (unlikely(rc != MDBX_SUCCESS)) { - if (rc == MDBX_NOTFOUND && values_count) - *values_count = 0; - return rc; - } - - if (values_count) { - *values_count = 1; - if (mc.mc_xcursor != NULL) { - MDBX_node *leaf = NODEPTR(mc.mc_pg[mc.mc_top], mc.mc_ki[mc.mc_top]); - if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - mdbx_tassert(txn, mc.mc_xcursor == &mx && - (mx.mx_cursor.mc_flags & C_INITIALIZED)); - *values_count = (sizeof(*values_count) >= sizeof(mx.mx_db.md_entries) || - mx.mx_db.md_entries <= SIZE_MAX) - ? (size_t)mx.mx_db.md_entries - : SIZE_MAX; - } - } - } - return MDBX_SUCCESS; -} - -/* Функция сообщает находится ли указанный адрес в "грязной" странице у - * заданной пишущей транзакции. В конечном счете это позволяет избавиться от - * лишнего копирования данных из НЕ-грязных страниц. - * - * "Грязные" страницы - это те, которые уже были изменены в ходе пишущей - * транзакции. Соответственно, какие-либо дальнейшие изменения могут привести - * к перезаписи таких страниц. Поэтому все функции, выполняющие изменения, в - * качестве аргументов НЕ должны получать указатели на данные в таких - * страницах. В свою очередь "НЕ грязные" страницы перед модификацией будут - * скопированы. - * - * Другими словами, данные из "грязных" страниц должны быть либо скопированы - * перед передачей в качестве аргументов для дальнейших модификаций, либо - * отвергнуты на стадии проверки корректности аргументов. - * - * Таким образом, функция позволяет как избавится от лишнего копирования, - * так и выполнить более полную проверку аргументов. - * - * ВАЖНО: Передаваемый указатель должен указывать на начало данных. Только - * так гарантируется что актуальный заголовок страницы будет физически - * расположен в той-же странице памяти, в том числе для многостраничных - * P_OVERFLOW страниц с длинными данными. */ -int mdbx_is_dirty(const MDBX_txn *txn, const void *ptr) { - if (unlikely(!txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(txn->mt_flags & MDBX_TXN_RDONLY)) - return MDBX_RESULT_FALSE; - - const MDBX_env *env = txn->mt_env; - const uintptr_t mask = ~(uintptr_t)(env->me_psize - 1); - const MDBX_page *page = (const MDBX_page *)((uintptr_t)ptr & mask); - - /* LY: Тут не всё хорошо с абсолютной достоверностью результата, - * так как флажок P_DIRTY в LMDB может означать не совсем то, - * что было исходно задумано, детали см в логике кода mdbx_page_touch(). - * - * Более того, в режиме БЕЗ WRITEMAP грязные страницы выделяются через - * malloc(), т.е. находятся вне mmap-диапазона и тогда чтобы отличить - * действительно грязную страницу от указателя на данные пользователя - * следует сканировать dirtylist, что накладно. - * - * Тем не менее, однозначно страница "не грязная" (не будет переписана - * во время транзакции) если адрес находится внутри mmap-диапазона - * и в заголовке страницы нет флажка P_DIRTY. */ - if (env->me_map < (uint8_t *)page) { - const size_t usedbytes = pgno2bytes(env, txn->mt_next_pgno); - if ((uint8_t *)page < env->me_map + usedbytes) { - /* страница внутри диапазона, смотрим на флажки */ - return (page->mp_flags & (P_DIRTY | P_LOOSE | P_KEEP)) - ? MDBX_RESULT_TRUE - : MDBX_RESULT_FALSE; - } - /* Гипотетически здесь возможна ситуация, когда указатель адресует что-то - * в пределах mmap, но за границей распределенных страниц. Это тяжелая - * ошибка, к которой не возможно прийти без каких-то больших нарушений. - * Поэтому не проверяем этот случай кроме как assert-ом, на то что - * страница вне mmap-диаппазона. */ - mdbx_tassert(txn, (uint8_t *)page >= env->me_map + env->me_mapsize); - } - - /* Страница вне используемого mmap-диапазона, т.е. либо в функцию был - * передан некорректный адрес, либо адрес в теневой странице, которая была - * выделена посредством malloc(). - * - * Для WRITE_MAP режима такая страница однозначно "не грязная", - * а для режимов без WRITE_MAP следует просматривать списки dirty - * и spilled страниц у каких-либо транзакций (в том числе дочерних). - * - * Поэтому для WRITE_MAP возвращаем false, а для остальных режимов - * всегда true. Такая логика имеет ряд преимуществ: - * - не тратим время на просмотр списков; - * - результат всегда безопасен (может быть ложно-положительным, - * но не ложно-отрицательным); - * - результат не зависит от вложенности транзакций и от относительного - * положения переданной транзакции в этой рекурсии. */ - return (env->me_flags & MDBX_WRITEMAP) ? MDBX_RESULT_FALSE : MDBX_RESULT_TRUE; -} - -int mdbx_dbi_sequence(MDBX_txn *txn, MDBX_dbi dbi, uint64_t *result, - uint64_t increment) { - if (unlikely(!txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_EBADSIGN; - - if (unlikely(txn->mt_owner != mdbx_thread_self())) - return MDBX_THREAD_MISMATCH; - - if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID))) - return MDBX_EINVAL; - - if (unlikely(TXN_DBI_CHANGED(txn, dbi))) - return MDBX_BAD_DBI; - - MDBX_db *dbs = &txn->mt_dbs[dbi]; - if (likely(result)) - *result = dbs->md_seq; - - if (likely(increment > 0)) { - if (unlikely(txn->mt_flags & MDBX_TXN_BLOCKED)) - return MDBX_BAD_TXN; - - if (unlikely(F_ISSET(txn->mt_flags, MDBX_TXN_RDONLY))) - return MDBX_EACCESS; - - uint64_t new = dbs->md_seq + increment; - if (unlikely(new < increment)) - return MDBX_RESULT_TRUE; - - assert(new > dbs->md_seq); - dbs->md_seq = new; - txn->mt_flags |= MDBX_TXN_DIRTY; - txn->mt_dbflags[dbi] |= DB_DIRTY; - } - - return MDBX_SUCCESS; -} - -/*----------------------------------------------------------------------------*/ -/* attribute support functions for Nexenta */ - -static __inline int mdbx_attr_peek(MDBX_val *data, mdbx_attr_t *attrptr) { - if (unlikely(data->iov_len < sizeof(mdbx_attr_t))) - return MDBX_INCOMPATIBLE; - - if (likely(attrptr != NULL)) - *attrptr = *(mdbx_attr_t *)data->iov_base; - data->iov_len -= sizeof(mdbx_attr_t); - data->iov_base = - likely(data->iov_len > 0) ? ((mdbx_attr_t *)data->iov_base) + 1 : NULL; - - return MDBX_SUCCESS; -} - -static __inline int mdbx_attr_poke(MDBX_val *reserved, MDBX_val *data, - mdbx_attr_t attr, unsigned flags) { - mdbx_attr_t *space = reserved->iov_base; - if (flags & MDBX_RESERVE) { - if (likely(data != NULL)) { - data->iov_base = data->iov_len ? space + 1 : NULL; - } - } else { - *space = attr; - if (likely(data != NULL)) { - memcpy(space + 1, data->iov_base, data->iov_len); - } - } - - return MDBX_SUCCESS; -} - -int mdbx_cursor_get_attr(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data, - mdbx_attr_t *attrptr, MDBX_cursor_op op) { - int rc = mdbx_cursor_get(mc, key, data, op); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - - return mdbx_attr_peek(data, attrptr); -} - -int mdbx_get_attr(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key, MDBX_val *data, - uint64_t *attrptr) { - int rc = mdbx_get(txn, dbi, key, data); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - - return mdbx_attr_peek(data, attrptr); -} - -int mdbx_put_attr(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key, MDBX_val *data, - mdbx_attr_t attr, unsigned flags) { - MDBX_val reserve; - reserve.iov_base = NULL; - reserve.iov_len = (data ? data->iov_len : 0) + sizeof(mdbx_attr_t); - - int rc = mdbx_put(txn, dbi, key, &reserve, flags | MDBX_RESERVE); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - - return mdbx_attr_poke(&reserve, data, attr, flags); -} - -int mdbx_cursor_put_attr(MDBX_cursor *cursor, MDBX_val *key, MDBX_val *data, - mdbx_attr_t attr, unsigned flags) { - MDBX_val reserve; - reserve.iov_base = NULL; - reserve.iov_len = (data ? data->iov_len : 0) + sizeof(mdbx_attr_t); - - int rc = mdbx_cursor_put(cursor, key, &reserve, flags | MDBX_RESERVE); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - - return mdbx_attr_poke(&reserve, data, attr, flags); -} - -int mdbx_set_attr(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key, MDBX_val *data, - mdbx_attr_t attr) { - if (unlikely(!key || !txn)) - return MDBX_EINVAL; - - if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE)) - return MDBX_VERSION_MISMATCH; - - if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID))) - return MDBX_EINVAL; - - if (unlikely(txn->mt_flags & (MDBX_TXN_RDONLY | MDBX_TXN_BLOCKED))) - return (txn->mt_flags & MDBX_TXN_RDONLY) ? MDBX_EACCESS : MDBX_BAD_TXN; - - MDBX_cursor mc; - MDBX_xcursor mx; - MDBX_val old_data; - mdbx_cursor_init(&mc, txn, dbi, &mx); - int rc = mdbx_cursor_set(&mc, key, &old_data, MDBX_SET, NULL); - if (unlikely(rc != MDBX_SUCCESS)) { - if (rc == MDBX_NOTFOUND && data) { - mc.mc_next = txn->mt_cursors[dbi]; - txn->mt_cursors[dbi] = &mc; - rc = mdbx_cursor_put_attr(&mc, key, data, attr, 0); - txn->mt_cursors[dbi] = mc.mc_next; - } - return rc; - } - - mdbx_attr_t old_attr = 0; - rc = mdbx_attr_peek(&old_data, &old_attr); - if (unlikely(rc != MDBX_SUCCESS)) - return rc; - - if (old_attr == attr && (!data || (data->iov_len == old_data.iov_len && - memcmp(data->iov_base, old_data.iov_base, - old_data.iov_len) == 0))) - return MDBX_SUCCESS; - - mc.mc_next = txn->mt_cursors[dbi]; - txn->mt_cursors[dbi] = &mc; - rc = mdbx_cursor_put_attr(&mc, key, data ? data : &old_data, attr, - MDBX_CURRENT); - txn->mt_cursors[dbi] = mc.mc_next; - return rc; -} - -//---------------------------------------------------------------------------- - -#ifdef __SANITIZE_ADDRESS__ -LIBMDBX_API __attribute__((weak)) const char *__asan_default_options() { - return "symbolize=1:allow_addr2line=1:" -#ifdef _DEBUG - "debug=1:" -#endif /* _DEBUG */ - "report_globals=1:" - "replace_str=1:replace_intrin=1:" - "malloc_context_size=9:" - "detect_leaks=1:" - "check_printf=1:" - "detect_deadlocks=1:" -#ifndef LTO_ENABLED - "check_initialization_order=1:" -#endif - "detect_stack_use_after_return=1:" - "intercept_tls_get_addr=1:" - "decorate_proc_maps=1:" - "abort_on_error=1"; -} -#endif /* __SANITIZE_ADDRESS__ */ |