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sync filesystems in reverse order. suggested originally by Jim Rees 

<rees@citi.umich.edu>, with some updating by Greg Hudson <ghudson@mit.edu>.
This commit is contained in:
mikel 1997-02-20 04:52:44 +00:00
parent 043293d2da
commit b0e7d3c13b
1 changed files with 6 additions and 6 deletions
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12
sys/kern/vfs_syscalls.c
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@ -1,4 +1,4 @@
/* $NetBSD: vfs_syscalls.c,v 1.76 1997/02/13 02:54:06 tls Exp $ */ /* $NetBSD: vfs_syscalls.c,v 1.77 1997/02/20 04:52:44 mikel Exp $ */
/* /*
* Copyright (c) 1989, 1993 * Copyright (c) 1989, 1993
@ -429,12 +429,12 @@ sys_sync(p, v, retval)
register struct mount *mp, *nmp; register struct mount *mp, *nmp;
int asyncflag; int asyncflag;
for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) {
/* /*
* Get the next pointer in case we hang on vfs_busy * Get the prev pointer in case we hang on vfs_busy
* while we are being unmounted. * while we are being unmounted.
*/ */
nmp = mp->mnt_list.cqe_next; nmp = mp->mnt_list.cqe_prev;
/* /*
* The lock check below is to avoid races with mount * The lock check below is to avoid races with mount
* and unmount. * and unmount.
@ -448,10 +448,10 @@ sys_sync(p, v, retval)
if (asyncflag) if (asyncflag)
mp->mnt_flag |= MNT_ASYNC; mp->mnt_flag |= MNT_ASYNC;
/* /*
* Get the next pointer again, as the next filesystem * Get the prev pointer again, as the prior filesystem
* might have been unmounted while we were sync'ing. * might have been unmounted while we were sync'ing.
*/ */
nmp = mp->mnt_list.cqe_next; nmp = mp->mnt_list.cqe_prev;
vfs_unbusy(mp); vfs_unbusy(mp);
} }
} }