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Leave extra space when creating a fake page

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Minimizes the number of memcpy's if additional dups are stored.
This commit is contained in:
Howard Chu 2012-07-22 17:42:36 -07:00
parent 05ec98d119
commit ccc4d23e74
1 changed files with 5 additions and 0 deletions
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5
libraries/libmdb/mdb.c
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@ -4321,6 +4321,7 @@ more:
if (mc->mc_db->md_flags & MDB_DUPFIXED) {
fp->mp_flags |= P_LEAF2;
fp->mp_pad = data->mv_size;
fp->mp_upper += 2 * data->mv_size; /* leave space for 2 more */
} else {
fp->mp_upper += 2 * sizeof(indx_t) + 2 * NODESIZE +
(dkey.mv_size & 1) + (data->mv_size & 1);
@ -4341,6 +4342,7 @@ more:
fp = NODEDATA(leaf);
if (flags == MDB_CURRENT) {
reuse:
fp->mp_flags |= P_DIRTY;
COPY_PGNO(fp->mp_pgno, mc->mc_pg[mc->mc_top]->mp_pgno);
mc->mc_xcursor->mx_cursor.mc_pg[0] = fp;
@ -4349,6 +4351,9 @@ more:
}
if (mc->mc_db->md_flags & MDB_DUPFIXED) {
offset = fp->mp_pad;
if (SIZELEFT(fp) >= offset)
goto reuse;
offset *= 4; /* space for 4 more */
} else {
offset = NODESIZE + sizeof(indx_t) + data->mv_size;
}