Date: Wed, 10 Mar 1999 22:00:01 -0800 (PST) From: Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/10528: MFS fails to die when system shut down Message-ID: <199903110600.WAA28228@freefall.freebsd.org>
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The following reply was made to PR kern/10528; it has been noted by GNATS.
From: Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca>
To: freebsd-gnats-submit@freebsd.org
Cc: cschuber@uumail.gov.bc.ca, dillon@freebsd.org
Subject: Re: kern/10528: MFS fails to die when system shut down
Date: Wed, 10 Mar 1999 21:51:47 -0800
Matthew, I've been trying to solve a "syncing filesystems... giving up"
problem under 3.1. My first cut was effective under some
circumstances, e.g. copying files to MFS but if MFS was used for /tmp
and X was in use at the time of the shutdown, my patch would still
fail. I've devised a better patch as follows. What do you think?
What I've done is change the P_SYSTEM flag to a P_NOSWAP. What I don't
understand is the comment about the swapper continuously trying to kill
MFS. I can see why you don't want it to swap out, because of potential
deadlock. It solves a "syncing filesystems" problem during shutdown.
I tested during a shutdown while a file is currently being written
to /tmp. Previously the system would panic: vinvalbuf: dirty bufs.
With the patch below it doesn't do that any more. Does my patch
introduce another problem?
I'd appreciate some guidance.
--- src/sys/ufs/mfs/mfs_vfsops.c.orig Thu Dec 31 20:14:11 1998
+++ src/sys/ufs/mfs/mfs_vfsops.c Wed Mar 10 21:08:13 1999
@@ -399,7 +399,8 @@
* can we swap out this process - not unless you want a deadlock,
* anyway.
*/
- curproc->p_flag |= P_SYSTEM;
+ /* curproc->p_flag |= P_SYSTEM; */
+ curproc->p_flag |= P_NOSWAP;
while (mfsp->mfs_active) {
while (bp = bufq_first(&mfsp->buf_queue)) {
Regards, Phone: (250)387-8437
Cy Schubert Fax: (250)387-5766
Open Systems Group Internet: Cy.Schubert@uumail.gov.bc.ca
ITSD Cy.Schubert@gems8.gov.bc.ca
Province of BC
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