Author: kib
Date: Wed Feb 29 15:09:20 2012
New Revision: 232301
URL: http://svn.freebsd.org/changeset/base/232301
Log:
Always request exclusive lock for the lower vnode in nullfs_vget().
The null_nodeget() requires exclusive lock on lowervp to be able to
insmntque() new vnode.
Reported by: rea
Tested by: pho
MFC after: 1 week
Modified:
head/sys/fs/nullfs/null_vfsops.c
Modified: head/sys/fs/nullfs/null_vfsops.c
==============================================================================
--- head/sys/fs/nullfs/null_vfsops.c Wed Feb 29 15:06:40 2012
(r232300)
+++ head/sys/fs/nullfs/null_vfsops.c Wed Feb 29 15:09:20 2012
(r232301)
@@ -312,6 +312,12 @@ nullfs_vget(mp, ino, flags, vpp)
struct vnode **vpp;
{
int error;
+
+ KASSERT((flags & LK_TYPE_MASK) != 0,
+ ("nullfs_vget: no lock requested"));
+ flags &= ~LK_TYPE_MASK;
+ flags |= LK_EXCLUSIVE;
+
error = VFS_VGET(MOUNTTONULLMOUNT(mp)->nullm_vfs, ino, flags, vpp);
if (error)
return (error);
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