f2fs: use generic posix ACL infrastructure

f2fs has some weird mode bit handling, so still using the old
chmod code for now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 89dc750..934b59c 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -953,6 +953,10 @@
 	return sb->s_flags & MS_RDONLY;
 }
 
+#define get_inode_mode(i) \
+	((is_inode_flag_set(F2FS_I(i), FI_ACL_MODE)) ? \
+	 (F2FS_I(i)->i_acl_mode) : ((i)->i_mode))
+
 /*
  * file.c
  */