diff options
author | Christoph Hellwig <hch@lst.de> | 2013-04-03 05:11:16 (GMT) |
---|---|---|
committer | Ben Myers <bpm@sgi.com> | 2013-04-21 19:58:22 (GMT) |
commit | 3fe58f30b4fc3f8a9084b035a02bc0c67bee8d00 (patch) | |
tree | 4b46222d26f3e74d65c6741ddcaed7eaa48948eb /fs/xfs/xfs_dquot.c | |
parent | 983d09ffe396ed5d5339a1b9ff994dd0b0f2069f (diff) | |
download | linux-3fe58f30b4fc3f8a9084b035a02bc0c67bee8d00.tar.xz |
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>
Diffstat (limited to 'fs/xfs/xfs_dquot.c')
-rw-r--r-- | fs/xfs/xfs_dquot.c | 112 |
1 files changed, 99 insertions, 13 deletions
diff --git a/fs/xfs/xfs_dquot.c b/fs/xfs/xfs_dquot.c index 45bb08f..a41f8bf 100644 --- a/fs/xfs/xfs_dquot.c +++ b/fs/xfs/xfs_dquot.c @@ -36,6 +36,7 @@ #include "xfs_trans_space.h" #include "xfs_trans_priv.h" #include "xfs_qm.h" +#include "xfs_cksum.h" #include "xfs_trace.h" /* @@ -248,6 +249,8 @@ xfs_qm_init_dquot_blk( d->dd_diskdq.d_version = XFS_DQUOT_VERSION; d->dd_diskdq.d_id = cpu_to_be32(curid); d->dd_diskdq.d_flags = type; + if (xfs_sb_version_hascrc(&mp->m_sb)) + uuid_copy(&d->dd_uuid, &mp->m_sb.sb_uuid); } xfs_trans_dquot_buf(tp, bp, @@ -283,25 +286,87 @@ xfs_dquot_set_prealloc_limits(struct xfs_dquot *dqp) dqp->q_low_space[XFS_QLOWSP_5_PCNT] = space * 5; } -static void +STATIC void +xfs_dquot_buf_calc_crc( + struct xfs_mount *mp, + struct xfs_buf *bp) +{ + struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; + int i; + + if (!xfs_sb_version_hascrc(&mp->m_sb)) + return; + + for (i = 0; i < mp->m_quotainfo->qi_dqperchunk; i++, d++) { + xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk), + offsetof(struct xfs_dqblk, dd_crc)); + } +} + +STATIC bool +xfs_dquot_buf_verify_crc( + struct xfs_mount *mp, + struct xfs_buf *bp) +{ + struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; + int ndquots; + int i; + + if (!xfs_sb_version_hascrc(&mp->m_sb)) + return true; + + /* + * if we are in log recovery, the quota subsystem has not been + * initialised so we have no quotainfo structure. In that case, we need + * to manually calculate the number of dquots in the buffer. + */ + if (mp->m_quotainfo) + ndquots = mp->m_quotainfo->qi_dqperchunk; + else + ndquots = xfs_qm_calc_dquots_per_chunk(mp, + XFS_BB_TO_FSB(mp, bp->b_length)); + + for (i = 0; i < ndquots; i++, d++) { + if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk), + offsetof(struct xfs_dqblk, dd_crc))) + return false; + if (!uuid_equal(&d->dd_uuid, &mp->m_sb.sb_uuid)) + return false; + } + + return true; +} + +STATIC bool xfs_dquot_buf_verify( + struct xfs_mount *mp, struct xfs_buf *bp) { - struct xfs_mount *mp = bp->b_target->bt_mount; struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; - struct xfs_disk_dquot *ddq; xfs_dqid_t id = 0; + int ndquots; int i; /* + * if we are in log recovery, the quota subsystem has not been + * initialised so we have no quotainfo structure. In that case, we need + * to manually calculate the number of dquots in the buffer. + */ + if (mp->m_quotainfo) + ndquots = mp->m_quotainfo->qi_dqperchunk; + else + ndquots = xfs_qm_calc_dquots_per_chunk(mp, bp->b_length); + + /* * On the first read of the buffer, verify that each dquot is valid. * We don't know what the id of the dquot is supposed to be, just that * they should be increasing monotonically within the buffer. If the * first id is corrupt, then it will fail on the second dquot in the * buffer so corruptions could point to the wrong dquot in this case. */ - for (i = 0; i < mp->m_quotainfo->qi_dqperchunk; i++) { - int error; + for (i = 0; i < ndquots; i++) { + struct xfs_disk_dquot *ddq; + int error; ddq = &d[i].dd_diskdq; @@ -309,27 +374,37 @@ xfs_dquot_buf_verify( id = be32_to_cpu(ddq->d_id); error = xfs_qm_dqcheck(mp, ddq, id + i, 0, XFS_QMOPT_DOWARN, - "xfs_dquot_read_verify"); - if (error) { - XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, d); - xfs_buf_ioerror(bp, EFSCORRUPTED); - break; - } + "xfs_dquot_buf_verify"); + if (error) + return false; } + return true; } static void xfs_dquot_buf_read_verify( struct xfs_buf *bp) { - xfs_dquot_buf_verify(bp); + struct xfs_mount *mp = bp->b_target->bt_mount; + + if (!xfs_dquot_buf_verify_crc(mp, bp) || !xfs_dquot_buf_verify(mp, bp)) { + XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); + xfs_buf_ioerror(bp, EFSCORRUPTED); + } } void xfs_dquot_buf_write_verify( struct xfs_buf *bp) { - xfs_dquot_buf_verify(bp); + struct xfs_mount *mp = bp->b_target->bt_mount; + + if (!xfs_dquot_buf_verify(mp, bp)) { + XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); + xfs_buf_ioerror(bp, EFSCORRUPTED); + return; + } + xfs_dquot_buf_calc_crc(mp, bp); } const struct xfs_buf_ops xfs_dquot_buf_ops = { @@ -1073,6 +1148,17 @@ xfs_qm_dqflush( &dqp->q_logitem.qli_item.li_lsn); /* + * copy the lsn into the on-disk dquot now while we have the in memory + * dquot here. This can't be done later in the write verifier as we + * can't get access to the log item at that point in time. + */ + if (xfs_sb_version_hascrc(&mp->m_sb)) { + struct xfs_dqblk *dqb = (struct xfs_dqblk *)ddqp; + + dqb->dd_lsn = cpu_to_be64(dqp->q_logitem.qli_item.li_lsn); + } + + /* * Attach an iodone routine so that we can remove this dquot from the * AIL and release the flush lock once the dquot is synced to disk. */ |