Btrfs: Add readonly inode flag

This patch adds readonly inode flag support.  A file with this flag
can't be modified, but can be deleted.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 0c0edacbc14c..245952cf7650 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -451,9 +451,9 @@ struct btrfs_root {
 /*
  * Inode flags
  */
-#define BTRFS_INODE_NODATASUM           0x1
-#define BTRFS_INODE_NODATACOW           0x2
-
+#define BTRFS_INODE_NODATASUM           (1 << 0)
+#define BTRFS_INODE_NODATACOW           (1 << 1)
+#define BTRFS_INODE_READONLY            (1 << 2)
 #define btrfs_clear_flag(inode, flag)   (BTRFS_I(inode)->flags &= \
                                          ~BTRFS_INODE_##flag)
 #define btrfs_set_flag(inode, flag)     (BTRFS_I(inode)->flags |= \