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authorSachin Prabhu <sprabhu@redhat.com>2010-03-13 09:03:55 -0600
committerEric Van Hensbergen <ericvh@gmail.com>2010-03-13 09:05:37 -0600
commitf78233dd44a110c574fe760ad6f9c1e8741a0d00 (patch)
tree5b38b76a9f7133cd6e86cecb66673b53fa93d85a
parentfc0f296126433e61600539325975b6c30681c07e (diff)
downloadop-kernel-dev-f78233dd44a110c574fe760ad6f9c1e8741a0d00.zip
op-kernel-dev-f78233dd44a110c574fe760ad6f9c1e8741a0d00.tar.gz
9p: Skip check for mandatory locks when unlocking
While investigating a bug, I came across a possible bug in v9fs. The problem is similar to the one reported for NFS by ASANO Masahiro in http://lkml.org/lkml/2005/12/21/334. v9fs_file_lock() will skip locks on file which has mode set to 02666. This is a problem in cases where the mode of the file is changed after a process has obtained a lock on the file. Such a lock will be skipped during unlock and the machine will end up with a BUG in locks_remove_flock(). v9fs_file_lock() should skip the check for mandatory locks when unlocking a file. Signed-off-by: Sachin Prabhu <sprabhu@redhat.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
-rw-r--r--fs/9p/vfs_file.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index 019f1cd..df52d48 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -114,7 +114,7 @@ static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
P9_DPRINTK(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
/* No mandatory locks */
- if (__mandatory_lock(inode))
+ if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
return -ENOLCK;
if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
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