cifs: don't attempt busy-file rename unless it's in same directory

Busy-file renames don't actually work across directories, so we need
to limit this code to renames within the same dir.

This fixes the bug detailed here:

    https://bugzilla.redhat.com/show_bug.cgi?id=591938

Signed-off-by: Jeff Layton <jlayton@redhat.com>
CC: Stable <stable@kernel.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 62b324f26a56..6f0683c68952 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1401,6 +1401,10 @@ cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
         if (rc == 0 || rc != -ETXTBSY)
                 return rc;
 
+        /* open-file renames don't work across directories */
+        if (to_dentry->d_parent != from_dentry->d_parent)
+                return rc;
+
         /* open the file to be renamed -- we need DELETE perms */
         rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,