[PATCH] fix fsync(dir) return value for ram-based filesystems

Any filesystem which is using simple_dir_operations will retunr -EINVAL for
fsync() on a directory.  Make it return zero instead.
Signed-off-by: NHugh Dickins <hugh@veritas.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

fs/libfs.c

@@ -183,6 +183,7 @@ struct file_operations simple_dir_operations = {
 	.llseek		= dcache_dir_lseek,
 	.read		= generic_read_dir,
 	.readdir	= dcache_readdir,
+	.fsync		= simple_sync_file,
 };
 
 struct inode_operations simple_dir_inode_operations = {