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Don't count non-local dirty buffers as outstanding when shutting down.

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This avoids the fsck-on-reboot symptoms if you're shutting down with a
hung or unreachable NFS server mounted.  Also remove non-local
filesystems from the mount list to prevent the system hanging when it tries
to unmount them (for the same reason).

Drew points out that there's a good argument for forcibly removing all
"non syncable" filesystems from the mount list (eg. NFS mounts, disks
that aren't responding, etc.) as this then allows you to sync and
cleanly unmount their parents.  No such change is included in this
patch.

Submitted by:	Andrew Gallatin <gallatin@cs.duke.edu>
This commit is contained in:
Mike Smith 1998-11-13 22:40:37 +00:00
parent b991b29639
commit d02d6d040a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=41137
1 changed files with 17 additions and 1 deletions
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18
sys/kern/kern_shutdown.c
View file

@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
* $Id: kern_shutdown.c,v 1.40 1998/09/20 16:50:31 dt Exp $
* $Id: kern_shutdown.c,v 1.41 1998/10/30 05:41:15 msmith Exp $
*/
#include "opt_ddb.h"
@ -49,6 +49,7 @@
#include <sys/buf.h>
#include <sys/reboot.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/mount.h>
@ -223,6 +224,21 @@ boot(howto)
printf("%d ", nbusy);
sync(&proc0, NULL);
DELAY(50000 * iter);
}
/*
* Count only busy local buffers to prevent forcing
* a fsck if we're just a client of a wedged NFS server
*/
nbusy = 0;
for (bp = &buf[nbuf]; --bp >= buf; ) {
if (((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY)
||((bp->b_flags & (B_DELWRI | B_INVAL))== B_DELWRI))
if(bp->b_dev == NODEV)
CIRCLEQ_REMOVE(&mountlist, bp->b_vp->v_mount, mnt_list);
else
nbusy++;
}
if (nbusy) {
/*