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>
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index dadf245..da2a19e 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -1961,6 +1961,16 @@
}
bp->b_ops = &xfs_agf_buf_ops;
break;
+ case XFS_BLF_AGFL_BUF:
+ if (!xfs_sb_version_hascrc(&mp->m_sb))
+ break;
+ if (*(__be32 *)bp->b_addr != cpu_to_be32(XFS_AGFL_MAGIC)) {
+ xfs_warn(mp, "Bad AGFL block magic!");
+ ASSERT(0);
+ break;
+ }
+ bp->b_ops = &xfs_agfl_buf_ops;
+ break;
default:
break;
}