diff options
| author | George Hazan <ghazan@miranda.im> | 2017-10-08 23:19:54 +0300 |
|---|---|---|
| committer | George Hazan <ghazan@miranda.im> | 2017-10-08 23:20:01 +0300 |
| commit | 7aeec32a33811541b330a75352958267f22fa0a3 (patch) | |
| tree | 397d770b0956933ea4ec4963943ea9827e2cf881 /plugins/Dbx_mdb/src/mdbx/mdbx.c | |
| parent | 73b775b4863e6498bc7794c9de27ef88529c835f (diff) | |
moving lmdb to mdbx engine
Diffstat (limited to 'plugins/Dbx_mdb/src/mdbx/mdbx.c')
| -rw-r--r-- | plugins/Dbx_mdb/src/mdbx/mdbx.c | 11544 |
1 files changed, 11544 insertions, 0 deletions
diff --git a/plugins/Dbx_mdb/src/mdbx/mdbx.c b/plugins/Dbx_mdb/src/mdbx/mdbx.c new file mode 100644 index 0000000000..897051a12b --- /dev/null +++ b/plugins/Dbx_mdb/src/mdbx/mdbx.c @@ -0,0 +1,11544 @@ +/* + * 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])); + if (unlikely(MDBX_PNL_DISORDERED(ptr[0], ptr[1]))) + 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; + + 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) { + /* 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", + }; + + 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); + } + 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) { + 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_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); + if (txnid_a == txnid_b) + return META_IS_STEADY(b) || (META_IS_WEAK(a) && !META_IS_WEAK(a)); + + mdbx_jitter4testing(true); + switch (mode) { + default: + assert(false); + /* fall through */ + case prefer_steady: + if (META_IS_STEADY(a) != META_IS_STEADY(b)) + return META_IS_STEADY(b); + /* fall through */ + case prefer_noweak: + if (META_IS_WEAK(a) != META_IS_WEAK(b)) + return !META_IS_WEAK(b); + /* fall through */ + case prefer_last: + mdbx_jitter4testing(true); + 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; + + txnid_t oldest = mdbx_reclaiming_detent(env); + mdbx_tassert(txn, oldest <= txn->mt_txnid - 1); + const txnid_t last_oldest = lck->mti_oldest; + mdbx_tassert(txn, oldest >= last_oldest); + if (last_oldest == oldest || + lck->mti_reader_finished_flag == MDBX_STRING_TETRAD("None")) + return last_oldest; + + const unsigned snap_nreaders = lck->mti_numreaders; + lck->mti_reader_finished_flag = MDBX_STRING_TETRAD("None"); + 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) + break; + } + } + } + + 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_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); + 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); + 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(); + } + 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[0])) { + mdbx_jitter4testing(false); + break; + } + if (env->me_lck) + env->me_lck->mti_reader_finished_flag = true; + } + + 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); + 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; + } + 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(txn->mt_owner != mdbx_thread_self())) + return MDBX_THREAD_MISMATCH; + + if (unlikely(!F_ISSET(txn->mt_flags, MDBX_TXN_RDONLY | MDBX_TXN_FINISHED))) + return MDBX_EINVAL; + + rc = mdbx_txn_renew0(txn, MDBX_TXN_RDONLY); + if (rc == MDBX_SUCCESS) { + 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_owner = mdbx_thread_self(); + 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_reader_finished_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 */ + return mdbx_txn_end(txn, MDBX_END_RESET | MDBX_END_UPDATE); +} + +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 != 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. */ + MDBX_page *mp = txn->mt_loose_pages; + if (unlikely((rc = mdbx_pnl_need(&txn->mt_befree_pages, + txn->mt_loose_count)) != 0)) + return rc; + for (; 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); + } + + 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, 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; + 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", meta_number); + 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_steady, 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); + 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_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; + } + 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 * meta.mm_psize, meta.mm_geo.now * meta.mm_psize, + meta.mm_geo.upper * meta.mm_psize, meta.mm_geo.grow * meta.mm_psize, + meta.mm_geo.shrink * 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_DUPFIXED sub-page */ + 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); + 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); + 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_reader_finished_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_reader_finished_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: + 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__ */ |