[GFS2] Add generation number

This adds a generation number for the eventual use of NFS to the
ondisk inode. Its backward compatible with the current code since
it doesn't really matter what the generation number is to start with,
and indeed since its set to zero, due to it being taken from padding
in both the inode and rgrp header, it should be fine.

The eventual plan is to use this rather than no_formal_ino in the
NFS filehandles. At that point no_formal_ino will be unused.

At the same time we also add a releasepages call back to the
"normal" address space for gfs2 inodes. Also I've removed a
one-linrer function thats not required any more.

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

1 files changed, 4 insertions, 2 deletions

diff --git a/include/linux/gfs2_ondisk.h b/include/linux/gfs2_ondisk.h
index 1181da831939..3ebd8743ce8c 100644
--- a/include/linux/gfs2_ondisk.h
+++ b/include/linux/gfs2_ondisk.h
@@ -170,8 +170,10 @@ struct gfs2_rgrp {
         __be32 rg_flags;
         __be32 rg_free;
         __be32 rg_dinodes;
+        __be32 __pad;
+        __be64 rg_igeneration;
 
-        __u8 rg_reserved[92]; /* Several fields from gfs1 now reserved */
+        __u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */
 };
 
 /*
@@ -248,7 +250,7 @@ struct gfs2_dinode {
          */
         __be64 di_goal_meta;    /* rgrp to alloc from next */
         __be64 di_goal_data;    /* data block goal */
-        __u32 __pad[2];
+        __be64 di_generation;   /* generation number for NFS */
 
         __be32 di_flags;        /* GFS2_DIF_... */
         __be32 di_payload_format;  /* GFS2_FORMAT_... */