[GFS2] Add nanosecond timestamp feature

This adds a nanosecond timestamp feature to the GFS2 filesystem. Due
to the way that the on-disk format works, older filesystems will just
appear to have this field set to zero. When mounted by an older version
of GFS2, the filesystem will simply ignore the extra fields so that
it will again appear to have whole second resolution, so that its
trivially backward compatible.

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

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/gfs2_ondisk.h b/include/linux/gfs2_ondisk.h
index 2c4e24fb0765..a44a6a078f0a 100644
--- a/include/linux/gfs2_ondisk.h
+++ b/include/linux/gfs2_ondisk.h
@@ -259,8 +259,11 @@ struct gfs2_dinode {
         struct gfs2_inum __pad4; /* Unused even in current gfs1 */
 
         __be64 di_eattr;        /* extended attribute block number */
+        __be32 di_atime_nsec;   /* nsec portion of atime */
+        __be32 di_mtime_nsec;   /* nsec portion of mtime */
+        __be32 di_ctime_nsec;   /* nsec portion of ctime */
 
-        __u8 di_reserved[56];
+        __u8 di_reserved[44];
 };
 
 /*