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MDB_VL32 change overflow page scan

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Just check the requested page, don't worry about any other pages
This commit is contained in:
Howard Chu 2016-01-28 13:14:38 +00:00
parent 60b064c759
commit f98fe467e9
1 changed files with 10 additions and 31 deletions
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41
external/db_drivers/liblmdb/mdb.c vendored
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@ -5829,7 +5829,7 @@ retry:
if (rc) if (rc)
goto fail; goto fail;
if (!el[x].mref) { if (!el[x].mref) {
munmap(el[x].mptr, el[x].mcnt); munmap(el[x].mptr, env->me_psize * el[x].mcnt);
el[x].mptr = id3.mptr; el[x].mptr = id3.mptr;
el[x].mcnt = id3.mcnt; el[x].mcnt = id3.mcnt;
} else { } else {
@ -5881,36 +5881,15 @@ fail:
pthread_mutex_unlock(&env->me_rpmutex); pthread_mutex_unlock(&env->me_rpmutex);
return rc; return rc;
} }
/* If this page is far enough from the end of the env, scan for /* check for overflow size */
* any overflow pages that would spill onto another block. p = (MDB_page *)((char *)id3.mptr + rem * env->me_psize);
* Note we must compare against mt_last_pgno, the last written if (IS_OVERFLOW(p) && p->mp_pages + rem > id3.mcnt) {
* page in the environment. Not mt_next_pgno, which increases id3.mcnt = p->mp_pages + rem;
* for every newly allocated (but not yet written) page. If munmap(id3.mptr, len);
* we scanned beyond the last written page we'd get a bus error. len = id3.mcnt * env->me_psize;
*/ MAP(rc, env, id3.mptr, len, off);
if (pgno + MDB_RPAGE_CHUNK <= txn->mt_last_pgno) { if (rc)
int i; goto fail;
char *cp = (char *)id3.mptr + rem * env->me_psize;
for (i=rem; i<MDB_RPAGE_CHUNK;) {
p = (MDB_page *)cp;
if (IS_OVERFLOW(p)) {
int nop = p->mp_pages;
if (nop + i > MDB_RPAGE_CHUNK) {
munmap(id3.mptr, len);
id3.mcnt = nop + i;
len = id3.mcnt * env->me_psize;
MAP(rc, env, id3.mptr, len, off);
if (rc)
goto fail;
break;
}
i += nop;
cp += nop * env->me_psize;
} else {
i++;
cp += env->me_psize;
}
}
} }
mdb_mid3l_insert(el, &id3); mdb_mid3l_insert(el, &id3);
pthread_mutex_unlock(&env->me_rpmutex); pthread_mutex_unlock(&env->me_rpmutex);