GFS2: Add "top dir" flag support

This patch adds support for the "top dir" flag. Currently this is unused
but a subsequent patch is planned which will add support for the
Orlov allocation policy when allocating subdirectories in a parent
with this flag set.

In order to ensure backward compatible behaviour, mkfs.gfs2 does
not currently tag the root directory with this flag, it must always be
set manually.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/linux/gfs2_ondisk.h b/include/linux/gfs2_ondisk.h
index fa98bdb073b9..e8ccf6ff3b4d 100644
--- a/include/linux/gfs2_ondisk.h
+++ b/include/linux/gfs2_ondisk.h
@@ -214,6 +214,7 @@ enum {
         gfs2fl_NoAtime          = 7,
         gfs2fl_Sync             = 8,
         gfs2fl_System           = 9,
+        gfs2fl_TopLevel         = 10,
         gfs2fl_TruncInProg      = 29,
         gfs2fl_InheritDirectio  = 30,
         gfs2fl_InheritJdata     = 31,
@@ -230,8 +231,9 @@ enum {
 #define GFS2_DIF_NOATIME                0x00000080
 #define GFS2_DIF_SYNC                   0x00000100
 #define GFS2_DIF_SYSTEM                 0x00000200 /* New in gfs2 */
+#define GFS2_DIF_TOPDIR                 0x00000400 /* New in gfs2 */
 #define GFS2_DIF_TRUNC_IN_PROG          0x20000000 /* New in gfs2 */
-#define GFS2_DIF_INHERIT_DIRECTIO       0x40000000
+#define GFS2_DIF_INHERIT_DIRECTIO       0x40000000 /* only in gfs1 */
 #define GFS2_DIF_INHERIT_JDATA          0x80000000
 
 struct gfs2_dinode {