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ITS#7772 Reduce spurious sub-page growth.

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mdb_cursor_put(): Use free sub-page space added by a
previous put(existing DUPSORT item), if any.
Tweak NUMKEYS code to avoid a new signedness warning.
This commit is contained in:
Hallvard Furuseth 2013-12-29 15:09:05 +01:00
parent 46de4ab84c
commit 75494c08b4
1 changed files with 10 additions and 10 deletions
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20
libraries/liblmdb/mdb.c
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@ -5845,7 +5845,7 @@ more:
* it. mp: new (sub-)page. offset: growth in page
* size. xdata: node data with new page or DB.
*/
unsigned i, offset = 0;
ssize_t i, offset = 0;
mp = fp = xdata.mv_data = env->me_pbuf;
mp->mp_pgno = mc->mc_pg[mc->mc_top]->mp_pgno;
@ -5901,17 +5901,17 @@ more:
fp = olddata.mv_data;
switch (flags) {
default:
i = -(ssize_t)SIZELEFT(fp);
if (!(mc->mc_db->md_flags & MDB_DUPFIXED)) {
offset = EVEN(NODESIZE + sizeof(indx_t) +
data->mv_size);
break;
}
offset = fp->mp_pad;
if (SIZELEFT(fp) < offset) {
offset = i += (ssize_t) EVEN(
sizeof(indx_t) + NODESIZE + data->mv_size);
} else {
i += offset = fp->mp_pad;
offset *= 4; /* space for 4 more */
break;
}
/* FALLTHRU: Big enough MDB_DUPFIXED sub-page */
if (i > 0)
break;
/* FALLTHRU: Sub-page is big enough */
case MDB_CURRENT:
fp->mp_flags |= P_DIRTY;
COPY_PGNO(fp->mp_pgno, mp->mp_pgno);
@ -5960,7 +5960,7 @@ prep_subDB:
} else {
memcpy((char *)mp + mp->mp_upper, (char *)fp + fp->mp_upper,
olddata.mv_size - fp->mp_upper);
for (i=0; i<NUMKEYS(fp); i++)
for (i = NUMKEYS(fp); --i >= 0; )
mp->mp_ptrs[i] = fp->mp_ptrs[i] + offset;
}
}