xfs: add CRC checks for quota blocks

Use the reserved space in struct xfs_dqblk to store a UUID and a crc
for the quota blocks.

[dchinner@redhat.com] Add a LSN field and update for current verifier
infrastructure.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/fs/xfs/xfs_quota.h b/fs/xfs/xfs_quota.h
index b50ec5b95d5a..c61e31c7d997 100644
--- a/fs/xfs/xfs_quota.h
+++ b/fs/xfs/xfs_quota.h
@@ -77,7 +77,14 @@ typedef struct	xfs_disk_dquot {
  */
 typedef struct xfs_dqblk {
         xfs_disk_dquot_t  dd_diskdq;    /* portion that lives incore as well */
-        char              dd_fill[32];  /* filling for posterity */
+        char              dd_fill[4];   /* filling for posterity */
+
+        /*
+         * These two are only present on filesystems with the CRC bits set.
+         */
+        __be32            dd_crc;       /* checksum */
+        __be64            dd_lsn;       /* last modification in log */
+        uuid_t            dd_uuid;      /* location information */
 } xfs_dqblk_t;
 
 /*
@@ -380,5 +387,7 @@ extern int xfs_qm_dqcheck(struct xfs_mount *, xfs_disk_dquot_t *,
                                 xfs_dqid_t, uint, uint, char *);
 extern int xfs_mount_reset_sbqflags(struct xfs_mount *);
 
+extern const struct xfs_buf_ops xfs_dquot_buf_ops;
+
 #endif  /* __KERNEL__ */
 #endif  /* __XFS_QUOTA_H__ */