xfs: add CRC checks for quota blocks
Use the reserved space in struct xfs_dqblk to store a UUID and a crc
for the quota blocks.
[dchinner@redhat.com] Add a LSN field and update for current verifier
infrastructure.
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_qm.c b/fs/xfs/xfs_qm.c
index d0acb4e..f41702b 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -617,6 +617,20 @@
}
}
+int
+xfs_qm_calc_dquots_per_chunk(
+ struct xfs_mount *mp,
+ unsigned int nbblks) /* basic block units */
+{
+ unsigned int ndquots;
+
+ ASSERT(nbblks > 0);
+ ndquots = BBTOB(nbblks);
+ do_div(ndquots, sizeof(xfs_dqblk_t));
+
+ return ndquots;
+}
+
/*
* This initializes all the quota information that's kept in the
* mount structure
@@ -656,9 +670,8 @@
/* Precalc some constants */
qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
- ASSERT(qinf->qi_dqchunklen);
- qinf->qi_dqperchunk = BBTOB(qinf->qi_dqchunklen);
- do_div(qinf->qi_dqperchunk, sizeof(xfs_dqblk_t));
+ qinf->qi_dqperchunk = xfs_qm_calc_dquots_per_chunk(mp,
+ qinf->qi_dqchunklen);
mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
@@ -897,6 +910,10 @@
if (error)
break;
+ /*
+ * XXX(hch): need to figure out if it makes sense to validate
+ * the CRC here.
+ */
xfs_qm_reset_dqcounts(mp, bp, firstid, type);
xfs_buf_delwri_queue(bp, buffer_list);
xfs_buf_relse(bp);