[patch 4/4] nfs: clean up sillyrenaming in nfs_rename()

[Miklos Szeredi]

From: Miklos Szeredi <mszeredi@xxxxxxx>

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@xxxxxxx>
---
 fs/nfs/dir.c |   11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

Index: linux-2.6/fs/nfs/dir.c
===================================================================
--- linux-2.6.orig/fs/nfs/dir.c	2009-12-02 15:11:19.000000000 +0100
+++ linux-2.6/fs/nfs/dir.c	2009-12-02 15:11:30.000000000 +0100
@@ -1611,14 +1611,11 @@ static int nfs_rename(struct inode *old_
 
 			/* 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;
 		}
 	}
 

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