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- Avoid overwriting the cursor page when the cursor page becomes the

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LRU page.
 - Fix for sequential retrieval failure when using large key/data pairs.

Obtained from:	OpenBSD
This commit is contained in:
Xin LI 2009-03-28 06:38:31 +00:00
parent 213bceeead
commit 89bc741f77
1 changed files with 21 additions and 1 deletions
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22
lib/libc/db/hash/hash_buf.c
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@ -164,11 +164,31 @@ newbuf(HTAB *hashp, u_int32_t addr, BUFHEAD *prev_bp)
oaddr = 0;
bp = LRU;
/* It is bad to overwrite the page under the cursor. */
if (bp == hashp->cpage) {
BUF_REMOVE(bp);
MRU_INSERT(bp);
bp = LRU;
}
/* If prev_bp is part of bp overflow, create a new buffer. */
if (hashp->nbufs == 0 && prev_bp && bp->ovfl) {
BUFHEAD *ovfl;
for (ovfl = bp->ovfl; ovfl ; ovfl = ovfl->ovfl) {
if (ovfl == prev_bp) {
hashp->nbufs++;
break;
}
}
}
/*
* If LRU buffer is pinned, the buffer pool is too small. We need to
* allocate more buffers.
*/
if (hashp->nbufs || (bp->flags & BUF_PIN)) {
if (hashp->nbufs || (bp->flags & BUF_PIN) || bp == hashp->cpage) {
/* Allocate a new one */
if ((bp = (BUFHEAD *)calloc(1, sizeof(BUFHEAD))) == NULL)
return (NULL);