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>

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 76b7f53..2c5ace4 100644 (file)
--- 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);
 
                        /* 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;
                                goto out;

+
+                       new_dentry = dentry;
+                       new_inode = NULL;

                }
        }
 
                }
        }