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ITS#7515 Fix nested txn touch of subpage/ovpage.

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mdb_page_touch(): Don't touch a subpage, replacing with non-subpage.
mdb_cursor_put(): Don't overwrite ancestor txn's dirty overflow page.
This commit is contained in:
Hallvard Furuseth 2013-05-20 23:12:52 +02:00
parent 5bdf2aae6e
commit a2ce25482a
1 changed files with 26 additions and 4 deletions
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30
libraries/liblmdb/mdb.c
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@ -1633,7 +1633,7 @@ finish:
SETPGNO(NODEPTR(mc->mc_pg[mc->mc_top-1], mc->mc_ki[mc->mc_top-1]), mp->mp_pgno);
else
mc->mc_db->md_root = mp->mp_pgno;
} else if (mc->mc_txn->mt_parent) {
} else if (mc->mc_txn->mt_parent && !(mp->mp_flags & P_SUBP)) {
MDB_page *np;
MDB_ID2 mid;
/* If txn has a parent, make sure the page is in our
@ -5197,11 +5197,11 @@ current:
if (F_ISSET(leaf->mn_flags, F_BIGDATA)) {
MDB_page *omp;
pgno_t pg;
int ovpages, dpages;
unsigned psize = mc->mc_txn->mt_env->me_psize;
int level, ovpages, dpages = OVPAGES(data->mv_size, psize);
dpages = OVPAGES(data->mv_size, mc->mc_txn->mt_env->me_psize);
memcpy(&pg, NODEDATA(leaf), sizeof(pg));
if ((rc2 = mdb_page_get(mc->mc_txn, pg, &omp, NULL)) != 0)
if ((rc2 = mdb_page_get(mc->mc_txn, pg, &omp, &level)) != 0)
return rc2;
ovpages = omp->mp_pages;
@ -5211,6 +5211,28 @@ current:
* bother to try shrinking the page if the new data
* is smaller than the overflow threshold.
*/
if (level > 1) {
/* It is writable only in a parent txn */
size_t sz = (size_t) psize * ovpages, off;
MDB_page *np = mdb_page_malloc(mc, ovpages);
MDB_ID2 id2;
if (!np)
return ENOMEM;
id2.mid = pg;
id2.mptr = np;
mdb_mid2l_insert(mc->mc_txn->mt_u.dirty_list, &id2);
if (!(flags & MDB_RESERVE)) {
/* Copy end of page, adjusting alignment so
* compiler may copy words instead of bytes.
*/
off = (PAGEHDRSZ + data->mv_size) & -sizeof(size_t);
memcpy((size_t *)((char *)np + off),
(size_t *)((char *)omp + off), sz - off);
sz = PAGEHDRSZ;
}
memcpy(np, omp, sz); /* Copy beginning of page */
omp = np;
}
SETDSZ(leaf, data->mv_size);
if (F_ISSET(flags, MDB_RESERVE))
data->mv_data = METADATA(omp);