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authorDave Chinner <dchinner@redhat.com>2013-04-03 09:11:13 +0400
committerBen Myers <bpm@sgi.com>2013-04-21 23:54:46 +0400
commit4e0e6040c4052aff15a494ac05778f4086d24c33 (patch)
tree6116acb302eb4be87e0193cb7476812a4cbddaac /fs/xfs/xfs_buf_item.h
parentee1a47ab0e77600fcbdf1c87d461bd8f3f63150d (diff)
downloadlinux-4e0e6040c4052aff15a494ac05778f4086d24c33.tar.xz
xfs: add CRC checks to the AGF
The AGF already has some self identifying fields (e.g. the sequence number) so we only need to add the uuid to it to identify the filesystem it belongs to. The location is fixed based on the sequence number, so there's no need to add a block number, either. Hence the only additional fields are the CRC and LSN fields. These are unlogged, so place some space between the end of the logged fields and them so that future expansion of the AGF for logged fields can be placed adjacent to the existing logged fields and hence not complicate the field-derived range based logging we currently have. Based originally on a patch from myself, modified further by Christoph Hellwig and then modified again to fit into the verifier structure with additional fields by myself. The multiple signed-off-by tags indicate the age and history of this patch. Signed-off-by: Dave Chinner <dgc@sgi.com> 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>
Diffstat (limited to 'fs/xfs/xfs_buf_item.h')
-rw-r--r--fs/xfs/xfs_buf_item.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/xfs/xfs_buf_item.h b/fs/xfs/xfs_buf_item.h
index 101ef8377f1b..76bd7a167a70 100644
--- a/fs/xfs/xfs_buf_item.h
+++ b/fs/xfs/xfs_buf_item.h
@@ -45,12 +45,14 @@ extern kmem_zone_t *xfs_buf_item_zone;
* once the changes have been replayed into the buffer.
*/
#define XFS_BLF_BTREE_BUF (1<<5)
+#define XFS_BLF_AGF_BUF (1<<6)
#define XFS_BLF_TYPE_MASK \
(XFS_BLF_UDQUOT_BUF | \
XFS_BLF_PDQUOT_BUF | \
XFS_BLF_GDQUOT_BUF | \
- XFS_BLF_BTREE_BUF)
+ XFS_BLF_BTREE_BUF | \
+ XFS_BLF_AGF_BUF)
#define XFS_BLF_CHUNK 128
#define XFS_BLF_SHIFT 7