Author: kevlo
Date: Mon Oct 25 06:16:27 2010
New Revision: 214316
URL: http://svn.freebsd.org/changeset/base/214316
Log:
MFC r214001:
Fix a possible, but very unlikely race where the directory dirent is
moved to the location that was used by ".." entry.
Modified:
stable/8/sys/fs/msdosfs/msdosfs_lookup.c
Modified: stable/8/sys/fs/msdosfs/msdosfs_lookup.c
==============================================================================
--- stable/8/sys/fs/msdosfs/msdosfs_lookup.c Mon Oct 25 05:37:12 2010
(r214315)
+++ stable/8/sys/fs/msdosfs/msdosfs_lookup.c Mon Oct 25 06:16:27 2010
(r214316)
@@ -594,10 +594,15 @@ msdosfs_deget_dotdot(struct vnode *vp, u
vfs_unbusy(mp);
if (error == 0)
*rvp = DETOV(rdp);
- vn_lock(vp, ltype | LK_RETRY);
+ if (*rvp != vp)
+ vn_lock(vp, ltype | LK_RETRY);
if (vp->v_iflag & VI_DOOMED) {
- if (error == 0)
- vput(*rvp);
+ if (error == 0) {
+ if (*rvp == vp)
+ vunref(*rvp);
+ else
+ vput(*rvp);
+ }
error = ENOENT;
}
return (error);
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