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lookup: Do a vfs_trybusy(). If the file system is being unmounted, then

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just fail the operation.
This commit is contained in:
ad 2008-05-06 15:04:00 +00:00
parent 8db3a2f0ba
commit d63f54a366
1 changed files with 7 additions and 4 deletions
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11
sys/kern/vfs_lookup.c
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@ -1,4 +1,4 @@
/* $NetBSD: vfs_lookup.c,v 1.106 2008/04/30 12:49:16 ad Exp $ */
/* $NetBSD: vfs_lookup.c,v 1.107 2008/05/06 15:04:00 ad Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1993
@ -37,7 +37,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_lookup.c,v 1.106 2008/04/30 12:49:16 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: vfs_lookup.c,v 1.107 2008/05/06 15:04:00 ad Exp $");
#include "opt_magiclinks.h"
@ -776,8 +776,11 @@ unionlookup:
*/
while (dp->v_type == VDIR && (mp = dp->v_mountedhere) &&
(cnp->cn_flags & NOCROSSMOUNT) == 0) {
if (vfs_busy(mp, RW_READER))
continue;
error = vfs_trybusy(mp, RW_READER, NULL);
if (error != 0) {
vput(dp);
goto bad;
}
KASSERT(ndp->ni_dvp != dp);
VOP_UNLOCK(ndp->ni_dvp, 0);