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Changed trypbuf to a getpbuf to work around a problem where redundant writes

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would occur when clustering them - caused by running out of buffers
and taking a degenerate code path as a result. It appears that waiting
instead for buffers to become available is okay.

Submitted by:	Matthew Dillon <dillon@apollo.backplane.com>
Discovered by: Craig A Soules <soules+@andrew.cmu.edu>
This commit is contained in:
David Greenman 1999-06-16 15:54:30 +00:00
parent ec5035fa0b
commit cd3fe8d008
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=47948
1 changed files with 2 additions and 2 deletions
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4
sys/kern/vfs_cluster.c
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@ -33,7 +33,7 @@
* SUCH DAMAGE.
*
* @(#)vfs_cluster.c 8.7 (Berkeley) 2/13/94
* $Id: vfs_cluster.c,v 1.80 1999/03/12 02:24:56 julian Exp $
* $Id: vfs_cluster.c,v 1.81 1999/05/02 23:56:11 alc Exp $
*/
#include "opt_debug_cluster.h"
@ -660,7 +660,7 @@ cluster_wbuild(vp, size, start_lbn, len)
(tbp->b_bcount != tbp->b_bufsize) ||
(tbp->b_bcount != size) ||
(len == 1) ||
((bp = trypbuf(&cluster_pbuf_freecnt)) == NULL)) {
((bp = getpbuf(&cluster_pbuf_freecnt)) == NULL)) {
totalwritten += tbp->b_bufsize;
bawrite(tbp);
++start_lbn;