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authorChristoph Hellwig <hch@lst.de>2013-04-03 16:11:14 +1100
committerBen Myers <bpm@sgi.com>2013-04-21 14:55:34 -0500
commit77c95bba013089fa868217283eb6d98a05913e53 (patch)
tree7b694c2baa200ac1bf2770d7bdfa4f2a292a2a58 /fs/xfs/xfs_fsops.c
parent4e0e6040c4052aff15a494ac05778f4086d24c33 (diff)
downloadop-kernel-dev-77c95bba013089fa868217283eb6d98a05913e53.zip
op-kernel-dev-77c95bba013089fa868217283eb6d98a05913e53.tar.gz
xfs: add CRC checks to the AGFL
Add CRC checks, location information and a magic number to the AGFL. Previously the AGFL was just a block containing nothing but the free block pointers. The new AGFL has a real header with the usual boilerplate instead, so that we can verify it's not corrupted and written into the right place. [dchinner@redhat.com] Added LSN field, reworked significantly to fit into new verifier structure and growfs structure, enabled full verifier functionality now there is a header to verify and we can guarantee an initialised AGFL. 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_fsops.c')
-rw-r--r--fs/xfs/xfs_fsops.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index b6cca27..a693a54 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -268,6 +268,11 @@ xfs_growfs_data_private(
}
agfl = XFS_BUF_TO_AGFL(bp);
+ if (xfs_sb_version_hascrc(&mp->m_sb)) {
+ agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
+ agfl->agfl_seqno = cpu_to_be32(agno);
+ uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid);
+ }
for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
agfl->agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
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