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mdbx: упрощение старта транзакций и исправление возможности double-free при ошибке создания вложенной транзакции.

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This commit is contained in:
Леонид Юрьев (Leonid Yuriev) 2025-04-23 23:26:57 +03:00
parent 7db9c40fe0
commit 6627d14edf
2 changed files with 47 additions and 51 deletions
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51
src/api-txn.c
View File

@ -235,9 +235,11 @@ int mdbx_txn_begin_ex(MDBX_env *env, MDBX_txn *parent, MDBX_txn_flags_t flags, M
flags |= parent->flags & (txn_rw_begin_flags | MDBX_TXN_SPILLS | MDBX_NOSTICKYTHREADS | MDBX_WRITEMAP);
rc = txn_nested_create(parent, flags);
txn = parent->nested;
if (unlikely(rc != MDBX_SUCCESS))
txn_end(txn, TXN_END_FAIL_BEGIN_NESTED);
else if (AUDIT_ENABLED() && ASSERT_ENABLED()) {
if (unlikely(rc != MDBX_SUCCESS)) {
int err = txn_end(txn, TXN_END_FAIL_BEGIN_NESTED);
return err ? err : rc;
}
if (AUDIT_ENABLED() && ASSERT_ENABLED()) {
txn->signature = txn_signature;
tASSERT(txn, audit_ex(txn, 0, false) == 0);
}
@ -249,31 +251,30 @@ int mdbx_txn_begin_ex(MDBX_env *env, MDBX_txn *parent, MDBX_txn_flags_t flags, M
return LOG_IFERR(MDBX_ENOMEM);
}
rc = txn_renew(txn, flags);
}
if (unlikely(rc != MDBX_SUCCESS)) {
if (txn != env->basal_txn)
osal_free(txn);
} else {
if (flags & (MDBX_TXN_RDONLY_PREPARE - MDBX_TXN_RDONLY))
eASSERT(env, txn->flags == (MDBX_TXN_RDONLY | MDBX_TXN_FINISHED));
else if (flags & MDBX_TXN_RDONLY)
eASSERT(env, (txn->flags & ~(MDBX_NOSTICKYTHREADS | MDBX_TXN_RDONLY | MDBX_WRITEMAP |
/* Win32: SRWL flag */ txn_shrink_allowed)) == 0);
else {
eASSERT(env, (txn->flags & ~(MDBX_NOSTICKYTHREADS | MDBX_WRITEMAP | txn_shrink_allowed | txn_may_have_cursors |
MDBX_NOMETASYNC | MDBX_SAFE_NOSYNC | MDBX_TXN_SPILLS)) == 0);
assert(!txn->wr.spilled.list && !txn->wr.spilled.least_removed);
if (unlikely(rc != MDBX_SUCCESS)) {
if (txn != env->basal_txn)
osal_free(txn);
return LOG_IFERR(rc);
}
txn->signature = txn_signature;
txn->userctx = context;
*ret = txn;
DEBUG("begin txn %" PRIaTXN "%c %p on env %p, root page %" PRIaPGNO "/%" PRIaPGNO, txn->txnid,
(flags & MDBX_TXN_RDONLY) ? 'r' : 'w', (void *)txn, (void *)env, txn->dbs[MAIN_DBI].root,
txn->dbs[FREE_DBI].root);
}
return LOG_IFERR(rc);
if (flags & (MDBX_TXN_RDONLY_PREPARE - MDBX_TXN_RDONLY))
eASSERT(env, txn->flags == (MDBX_TXN_RDONLY | MDBX_TXN_FINISHED));
else if (flags & MDBX_TXN_RDONLY)
eASSERT(env, (txn->flags & ~(MDBX_NOSTICKYTHREADS | MDBX_TXN_RDONLY | MDBX_WRITEMAP |
/* Win32: SRWL flag */ txn_shrink_allowed)) == 0);
else {
eASSERT(env, (txn->flags & ~(MDBX_NOSTICKYTHREADS | MDBX_WRITEMAP | txn_shrink_allowed | txn_may_have_cursors |
MDBX_NOMETASYNC | MDBX_SAFE_NOSYNC | MDBX_TXN_SPILLS)) == 0);
assert(!txn->wr.spilled.list && !txn->wr.spilled.least_removed);
}
txn->signature = txn_signature;
txn->userctx = context;
*ret = txn;
DEBUG("begin txn %" PRIaTXN "%c %p on env %p, root page %" PRIaPGNO "/%" PRIaPGNO, txn->txnid,
(flags & MDBX_TXN_RDONLY) ? 'r' : 'w', (void *)txn, (void *)env, txn->dbs[MAIN_DBI].root,
txn->dbs[FREE_DBI].root);
return MDBX_SUCCESS;
}
static void latency_gcprof(MDBX_commit_latency *latency, const MDBX_txn *txn) {

47
src/txn-nested.c
View File

@ -348,25 +348,30 @@ int txn_nested_create(MDBX_txn *parent, const MDBX_txn_flags_t flags) {
return LOG_IFERR(MDBX_ENOMEM);
tASSERT(parent, dpl_check(parent));
txn->txnid = parent->txnid;
txn->front_txnid = parent->front_txnid + 1;
txn->canary = parent->canary;
parent->flags |= MDBX_TXN_HAS_CHILD;
parent->nested = txn;
txn->parent = parent;
txn->env->txn = txn;
txn->owner = parent->owner;
txn->wr.troika = parent->wr.troika;
#if MDBX_ENABLE_DBI_SPARSE
txn->dbi_sparse = parent->dbi_sparse;
#endif /* MDBX_ENABLE_DBI_SPARSE */
txn->dbi_seqs = parent->dbi_seqs;
txn->geo = parent->geo;
int err = dpl_alloc(txn);
if (likely(err == MDBX_SUCCESS)) {
const size_t len = MDBX_PNL_GETSIZE(parent->wr.repnl) + parent->wr.loose_count;
txn->wr.repnl = pnl_alloc((len > MDBX_PNL_INITIAL) ? len : MDBX_PNL_INITIAL);
if (unlikely(!txn->wr.repnl))
err = MDBX_ENOMEM;
}
if (unlikely(err != MDBX_SUCCESS)) {
failed:
pnl_free(txn->wr.repnl);
dpl_free(txn);
osal_free(txn);
if (unlikely(err != MDBX_SUCCESS))
return LOG_IFERR(err);
}
const size_t len = MDBX_PNL_GETSIZE(parent->wr.repnl) + parent->wr.loose_count;
txn->wr.repnl = pnl_alloc((len > MDBX_PNL_INITIAL) ? len : MDBX_PNL_INITIAL);
if (unlikely(!txn->wr.repnl))
return LOG_IFERR(MDBX_ENOMEM);
/* Move loose pages to reclaimed list */
if (parent->wr.loose_count) {
@ -375,7 +380,7 @@ int txn_nested_create(MDBX_txn *parent, const MDBX_txn_flags_t flags) {
tASSERT(parent, lp->flags == P_LOOSE);
err = pnl_insert_span(&parent->wr.repnl, lp->pgno, 1);
if (unlikely(err != MDBX_SUCCESS))
goto failed;
return LOG_IFERR(err);
MDBX_ASAN_UNPOISON_MEMORY_REGION(&page_next(lp), sizeof(page_t *));
VALGRIND_MAKE_MEM_DEFINED(&page_next(lp), sizeof(page_t *));
parent->wr.loose_pages = page_next(lp);
@ -388,6 +393,9 @@ int txn_nested_create(MDBX_txn *parent, const MDBX_txn_flags_t flags) {
#endif /* MDBX_ENABLE_REFUND */
tASSERT(parent, dpl_check(parent));
}
#if MDBX_ENABLE_REFUND
txn->wr.loose_refund_wl = 0;
#endif /* MDBX_ENABLE_REFUND */
txn->wr.dirtyroom = parent->wr.dirtyroom;
txn->wr.dirtylru = parent->wr.dirtylru;
@ -412,18 +420,6 @@ int txn_nested_create(MDBX_txn *parent, const MDBX_txn_flags_t flags) {
txn->wr.retired_pages = parent->wr.retired_pages;
parent->wr.retired_pages = (void *)(intptr_t)MDBX_PNL_GETSIZE(parent->wr.retired_pages);
txn->txnid = parent->txnid;
txn->front_txnid = parent->front_txnid + 1;
#if MDBX_ENABLE_REFUND
txn->wr.loose_refund_wl = 0;
#endif /* MDBX_ENABLE_REFUND */
txn->canary = parent->canary;
parent->flags |= MDBX_TXN_HAS_CHILD;
parent->nested = txn;
txn->parent = parent;
txn->owner = parent->owner;
txn->wr.troika = parent->wr.troika;
txn->cursors[FREE_DBI] = nullptr;
txn->cursors[MAIN_DBI] = nullptr;
txn->dbi_state[FREE_DBI] = parent->dbi_state[FREE_DBI] & ~(DBI_FRESH | DBI_CREAT | DBI_DIRTY);
@ -435,7 +431,6 @@ int txn_nested_create(MDBX_txn *parent, const MDBX_txn_flags_t flags) {
(parent->parent ? parent->parent->wr.dirtyroom : parent->env->options.dp_limit));
tASSERT(txn, txn->wr.dirtyroom + txn->wr.dirtylist->length ==
(txn->parent ? txn->parent->wr.dirtyroom : txn->env->options.dp_limit));
parent->env->txn = txn;
tASSERT(parent, parent->cursors[FREE_DBI] == nullptr);
return txn_shadow_cursors(parent, MAIN_DBI);
}