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xfs: add CRC checks to the AGFL

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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>
This commit is contained in:
Christoph Hellwig
2013-04-03 16:11:14 +11:00
committed by Ben Myers
parent 4e0e6040c4
commit 77c95bba01
5 changed files with 124 additions and 49 deletions
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10
fs/xfs/xfs_log_recover.c
View File

@@ -1961,6 +1961,16 @@ xlog_recover_do_reg_buffer(
}
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;
}