nfs: clean up sillyrenaming in nfs_rename()

The d_instantiate(new_dentry, NULL) is superfluous, the dentry is
already negative.  Rehashing this dummy dentry isn't needed either,
d_move() works fine on an unhashed target.

The re-checking for busy after a failed nfs_sillyrename() is bogus
too: new_dentry->d_count < 2 would be a bug here.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 4 insertions, 7 deletions

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 76b7f539d76..2c5ace4f00a 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1611,14 +1611,11 @@ static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 
                         /* silly-rename the existing target ... */
                         err = nfs_sillyrename(new_dir, new_dentry);
-                        if (!err) {
-                                new_dentry = rehash = dentry;
-                                new_inode = NULL;
-                                /* instantiate the replacement target */
-                                d_instantiate(new_dentry, NULL);
-                        } else if (atomic_read(&new_dentry->d_count) > 1)
-                                /* dentry still busy? */
+                        if (err)
                                 goto out;
+
+                        new_dentry = dentry;
+                        new_inode = NULL;
                 }
         }