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mdbx: проверка номеров корневых страниц в coherency_check() (backport).

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Леонид Юрьев (Leonid Yuriev) 2023-11-10 13:48:06 +03:00
parent 7eb2f4130e
commit ab5d290f11
1 changed files with 27 additions and 2 deletions
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29
src/core.c
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@ -8615,20 +8615,45 @@ static bool coherency_check(const MDBX_env *env, const txnid_t txnid,
const volatile MDBX_meta *meta, bool report) {
const txnid_t freedb_mod_txnid = dbs[FREE_DBI].md_mod_txnid;
const txnid_t maindb_mod_txnid = dbs[MAIN_DBI].md_mod_txnid;
const pgno_t last_pgno = meta->mm_geo.now;
const pgno_t freedb_root_pgno = dbs[FREE_DBI].md_root;
const MDBX_page *freedb_root = (env->me_map && freedb_root_pgno != P_INVALID)
const MDBX_page *freedb_root = (env->me_map && freedb_root_pgno < last_pgno)
? pgno2page(env, freedb_root_pgno)
: nullptr;
const pgno_t maindb_root_pgno = dbs[MAIN_DBI].md_root;
const MDBX_page *maindb_root = (env->me_map && maindb_root_pgno != P_INVALID)
const MDBX_page *maindb_root = (env->me_map && maindb_root_pgno < last_pgno)
? pgno2page(env, maindb_root_pgno)
: nullptr;
const uint64_t magic_and_version =
unaligned_peek_u64_volatile(4, &meta->mm_magic_and_version);
bool ok = true;
if (freedb_root_pgno != P_INVALID &&
unlikely(freedb_root_pgno >= last_pgno)) {
if (report)
WARNING(
"catch invalid %sdb root %" PRIaPGNO " for meta_txnid %" PRIaTXN
" %s",
"free", freedb_root_pgno, txnid,
(env->me_stuck_meta < 0)
? "(workaround for incoherent flaw of unified page/buffer cache)"
: "(wagering meta)");
ok = false;
}
if (maindb_root_pgno != P_INVALID &&
unlikely(maindb_root_pgno >= last_pgno)) {
if (report)
WARNING(
"catch invalid %sdb root %" PRIaPGNO " for meta_txnid %" PRIaTXN
" %s",
"main", maindb_root_pgno, txnid,
(env->me_stuck_meta < 0)
? "(workaround for incoherent flaw of unified page/buffer cache)"
: "(wagering meta)");
ok = false;
}
if (unlikely(txnid < freedb_mod_txnid ||
(!freedb_mod_txnid && freedb_root &&
likely(magic_and_version == MDBX_DATA_MAGIC)))) {