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PR 51264 Jose Luis Rodriguez Garcia: lfs userland bufcache rehash is broken

This commit is contained in:
dholland 2016-07-31 18:27:26 +00:00
parent fc8d0c1c35
commit ed2ef35eef
1 changed files with 6 additions and 5 deletions
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11
sbin/fsck_lfs/bufcache.c
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@ -1,4 +1,4 @@
/* $NetBSD: bufcache.c,v 1.15 2015/03/29 19:35:58 chopps Exp $ */
/* $NetBSD: bufcache.c,v 1.16 2016/07/31 18:27:26 dholland Exp $ */
/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
@ -101,17 +101,19 @@ bufinit(int max)
/* Widen the hash table. */
void bufrehash(int max)
{
int i, newhashmax, newhashmask;
int i, newhashmax;
struct ubuf *bp, *nbp;
struct bufhash_struct *np;
if (max < 0 || max < hashmax)
if (max < 0 || max <= hashmax)
return;
/* Round up to a power of two */
for (newhashmax = 1; newhashmax < max; newhashmax <<= 1)
;
newhashmask = newhashmax - 1;
/* update the mask right away so vl_hash() uses it */
hashmask = newhashmax - 1;
/* Allocate new empty hash table, if we can */
np = emalloc(newhashmax * sizeof(*bufhash));
@ -134,7 +136,6 @@ void bufrehash(int max)
free(bufhash);
bufhash = np;
hashmax = newhashmax;
hashmask = newhashmask;
}
/* Print statistics of buffer cache usage */