reiserfs: use generic xattr handlers

Christoph Hellwig had asked me quite some time ago to port the reiserfs
xattrs to the generic xattr interface.

This patch replaces the reiserfs-specific xattr handling code with the
generic struct xattr_handler.

However, since reiserfs doesn't split the prefix and name when accessing
xattrs, it can't leverage generic_{set,get,list,remove}xattr without
needlessly reconstructing the name on the back end.

Update 7/26/07: Added missing dput() to deletion path.
Update 8/30/07: Added missing mark_inode_dirty when i_mode is used to
                represent an ACL and no previous ACL existed.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/reiserfs/super.c

@@ -2263,9 +2263,6 @@ static int __init init_reiserfs_fs(void)
 		return ret;
 	}
 
-	if ((ret = reiserfs_xattr_register_handlers()))
-		goto failed_reiserfs_xattr_register_handlers;
-
 	reiserfs_proc_info_global_init();
 	reiserfs_proc_register_global("version",
 				      reiserfs_global_version_in_proc);
@@ -2276,9 +2273,6 @@ static int __init init_reiserfs_fs(void)
 		return 0;
 	}
 
-	reiserfs_xattr_unregister_handlers();
-
-      failed_reiserfs_xattr_register_handlers:
 	reiserfs_proc_unregister_global("version");
 	reiserfs_proc_info_global_done();
 	destroy_inodecache();
@@ -2288,7 +2282,6 @@ static int __init init_reiserfs_fs(void)
 
 static void __exit exit_reiserfs_fs(void)
 {
-	reiserfs_xattr_unregister_handlers();
 	reiserfs_proc_unregister_global("version");
 	reiserfs_proc_info_global_done();
 	unregister_filesystem(&reiserfs_fs_type);