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authorChristoph Hellwig <hch@lst.de>2012-11-16 09:20:37 +1100
committerBen Myers <bpm@sgi.com>2012-11-19 20:11:24 -0600
commitbc02e8693d875c2a9b0037cfd37fe0b726d26403 (patch)
tree6896726d63947779f941a4daf055da142ad07985 /fs/xfs/xfs_sb.h
parent1813dd64057490e7a0678a885c4fe6d02f78bdc1 (diff)
downloadop-kernel-dev-bc02e8693d875c2a9b0037cfd37fe0b726d26403.zip
op-kernel-dev-bc02e8693d875c2a9b0037cfd37fe0b726d26403.tar.gz
xfs: add CRC infrastructure
- add a mount feature bit for CRC enabled filesystems - add some helpers for generating and verifying the CRCs - add a copy_uuid helper The checksumming helpers are loosely based on similar ones in sctp, all other bits come from Dave Chinner. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_sb.h')
-rw-r--r--fs/xfs/xfs_sb.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/xfs/xfs_sb.h b/fs/xfs/xfs_sb.h
index f429d9d..a05b451 100644
--- a/fs/xfs/xfs_sb.h
+++ b/fs/xfs/xfs_sb.h
@@ -81,6 +81,7 @@ struct xfs_mount;
#define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */
#define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */
#define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */
+#define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */
#define XFS_SB_VERSION2_OKREALFBITS \
(XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
@@ -503,6 +504,12 @@ static inline int xfs_sb_version_hasprojid32bit(xfs_sb_t *sbp)
(sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT);
}
+static inline int xfs_sb_version_hascrc(xfs_sb_t *sbp)
+{
+ return (xfs_sb_version_hasmorebits(sbp) &&
+ (sbp->sb_features2 & XFS_SB_VERSION2_CRCBIT));
+}
+
/*
* end of superblock version macros
*/
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