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mdbx: minor refine/speedup mdbx_page_get().

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Change-Id: Ia11a76f0255db1a56948438cdc333ebd67d88193
This commit is contained in:
Leonid Yuriev 2020-01-26 19:07:00 +03:00
parent a8c5daf46a
commit 308548e226
1 changed files with 15 additions and 15 deletions
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30
src/elements/core.c
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@ -10116,6 +10116,10 @@ __hot static int mdbx_page_get(MDBX_cursor *mc, pgno_t pgno, MDBX_page **ret,
MDBX_page *p = NULL;
int level;
mdbx_assert(env, ((txn->mt_flags ^ env->me_flags) & MDBX_WRITEMAP) == 0);
const uint16_t illegal_bits = (txn->mt_flags & MDBX_RDONLY)
? P_LOOSE | P_SUBP | P_META | P_DIRTY
: P_LOOSE | P_SUBP | P_META;
const uint64_t txnid = txn->mt_txnid;
if (unlikely((txn->mt_flags & (MDBX_RDONLY | MDBX_WRITEMAP)) == 0)) {
level = 1;
do {
@ -10144,21 +10148,18 @@ dirty:
goto corrupted;
}
if (unlikely((p->mp_flags & (P_LOOSE | P_SUBP | P_META | P_DIRTY)) != 0 ||
p->mp_txnid > mc->mc_txn->mt_txnid)) {
if (unlikely((mc->mc_txn->mt_flags & MDBX_RDONLY) != 0 ||
(p->mp_flags & (P_LOOSE | P_SUBP | P_META | P_DIRTY)) !=
P_DIRTY)) {
mdbx_error("invalid page's flags (0x%x) or txnid %" PRIaTXN
" > (actual) %" PRIaTXN " (expected)",
p->mp_flags, p->mp_txnid, mc->mc_txn->mt_txnid);
goto corrupted;
}
if (unlikely((p->mp_flags & illegal_bits) != 0 ||
p->mp_txnid > ((p->mp_flags & P_DIRTY) ? UINT64_MAX : txnid))) {
mdbx_error("invalid page's flags (0x%x) or txnid %" PRIaTXN
" > (actual) %" PRIaTXN " (expected)",
p->mp_flags, p->mp_txnid, mc->mc_txn->mt_txnid);
goto corrupted;
}
if (unlikely(!IS_OVERFLOW(p) && (p->mp_upper < p->mp_lower ||
((p->mp_lower | p->mp_upper) & 1) != 0 ||
PAGEHDRSZ + p->mp_upper > env->me_psize))) {
if (unlikely((p->mp_upper < p->mp_lower ||
((p->mp_lower | p->mp_upper) & 1) != 0 ||
PAGEHDRSZ + p->mp_upper > env->me_psize) &&
!IS_OVERFLOW(p))) {
mdbx_error("invalid page lower(%u)/upper(%u), pg-limit %u", p->mp_lower,
p->mp_upper, page_space(env));
goto corrupted;
@ -10170,9 +10171,8 @@ dirty:
return err;
}
*(lvl ? lvl : &level) = level;
*ret = p;
if (lvl)
*lvl = level;
return MDBX_SUCCESS;
corrupted: