From 3fe58f30b4fc3f8a9084b035a02bc0c67bee8d00 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 3 Apr 2013 16:11:16 +1100 Subject: 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 Signed-off-by: Dave Chinner Reviewed-by: Ben Myers Signed-off-by: Ben Myers --- fs/xfs/xfs_qm.c | 23 ++++++++++++++++++++--- 1 file changed, 20 insertions(+), 3 deletions(-) (limited to 'fs/xfs/xfs_qm.c') diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c index d0acb4e40a6f..f41702b43003 100644 --- a/fs/xfs/xfs_qm.c +++ b/fs/xfs/xfs_qm.c @@ -617,6 +617,20 @@ xfs_qm_dqdetach( } } +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 @@ xfs_qm_init_quotainfo( /* 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 @@ xfs_qm_dqiter_bufs( 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); -- cgit v1.2.3-59-g8ed1b