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mdbx: backport - Comment ovpage code in mdb_cursor_put().

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Change-Id: I6b3bff87dc49135fdda3e9ce0a505822ab26d3d5
This commit is contained in:
Hallvard Furuseth 2016-05-10 07:11:44 +02:00 committed by Leo Yuriev
parent 7c3c28239c
commit 1ef0106b51
1 changed files with 7 additions and 2 deletions
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9
mdb.c
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@ -6895,9 +6895,14 @@ current:
/* Note - this page is already counted in parent's dirty_room */ /* Note - this page is already counted in parent's dirty_room */
rc2 = mdb_mid2l_insert(mc->mc_txn->mt_u.dirty_list, &id2); rc2 = mdb_mid2l_insert(mc->mc_txn->mt_u.dirty_list, &id2);
mdb_cassert(mc, rc2 == 0); mdb_cassert(mc, rc2 == 0);
/* Currently we make the page look as with put() in the
* parent txn, in case the user peeks at MDB_RESERVEd
* or unused parts. Some users treat ovpages specially.
*/
if (1 || /* LY: Hm, why we should do this differently in dependence from MDB_RESERVE? */ if (1 || /* LY: Hm, why we should do this differently in dependence from MDB_RESERVE? */
!(flags & MDB_RESERVE)) { !(flags & MDB_RESERVE)) {
/* Copy end of page, adjusting alignment so /* Skip the part where LMDB will put *data.
* Copy end of page, adjusting alignment so
* compiler may copy words instead of bytes. * compiler may copy words instead of bytes.
*/ */
off = (PAGEHDRSZ + data->mv_size) & -sizeof(size_t); off = (PAGEHDRSZ + data->mv_size) & -sizeof(size_t);
@ -6905,7 +6910,7 @@ current:
(size_t *)((char *)omp + off), sz - off); (size_t *)((char *)omp + off), sz - off);
sz = PAGEHDRSZ; sz = PAGEHDRSZ;
} }
memcpy(np, omp, sz); /* Copy beginning of page */ memcpy(np, omp, sz); /* Copy whole or beginning of page */
omp = np; omp = np;
} }
SETDSZ(leaf, data->mv_size); SETDSZ(leaf, data->mv_size);