logfs: remove unnecessary dentry_unhash from rmdir, dir rename

logfs does not have problems with references to unlinked directories.

CC: Joern Engel <joern@logfs.org>
CC: logfs@logfs.org
Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/logfs/dir.c

@@ -273,8 +273,6 @@ static int logfs_rmdir(struct inode *dir, struct dentry *dentry)
 {
 	struct inode *inode = dentry->d_inode;
 
-	dentry_unhash(dentry);
-
 	if (!logfs_empty_dir(inode))
 		return -ENOTEMPTY;
 
@@ -624,9 +622,6 @@ static int logfs_rename_cross(struct inode *old_dir, struct dentry *old_dentry,
 	loff_t pos;
 	int err;
 
-	if (new_dentry->d_inode && S_ISDIR(new_dentry->d_inode->i_mode))
-		dentry_unhash(new_dentry);
-
 	/* 1. locate source dd */
 	err = logfs_get_dd(old_dir, old_dentry, &dd, &pos);
 	if (err)