diff options
| -rw-r--r-- | fs/xfs/xfs_dquot.c | 117 | ||||
| -rw-r--r-- | fs/xfs/xfs_dquot.h | 1 | ||||
| -rw-r--r-- | fs/xfs/xfs_qm.c | 3 |
3 files changed, 98 insertions, 23 deletions
diff --git a/fs/xfs/xfs_dquot.c b/fs/xfs/xfs_dquot.c index e95f800333d4..0ba0f0992d6e 100644 --- a/fs/xfs/xfs_dquot.c +++ b/fs/xfs/xfs_dquot.c @@ -360,6 +360,89 @@ xfs_qm_dqalloc( return (error); } +void +xfs_dquot_read_verify( + 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 i; + + /* + * 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; + + ddq = &d[i].dd_diskdq; + + if (i == 0) + 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("xfs_dquot_read_verify", + XFS_ERRLEVEL_LOW, mp, d); + xfs_buf_ioerror(bp, EFSCORRUPTED); + break; + } + } + bp->b_iodone = NULL; + xfs_buf_ioend(bp, 0); +} + +STATIC int +xfs_qm_dqrepair( + struct xfs_mount *mp, + struct xfs_trans *tp, + struct xfs_dquot *dqp, + xfs_dqid_t firstid, + struct xfs_buf **bpp) +{ + int error; + struct xfs_disk_dquot *ddq; + struct xfs_dqblk *d; + int i; + + /* + * Read the buffer without verification so we get the corrupted + * buffer returned to us. + */ + error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, dqp->q_blkno, + mp->m_quotainfo->qi_dqchunklen, + 0, bpp, NULL); + + if (error) { + ASSERT(*bpp == NULL); + return XFS_ERROR(error); + } + + ASSERT(xfs_buf_islocked(*bpp)); + d = (struct xfs_dqblk *)(*bpp)->b_addr; + + /* Do the actual repair of dquots in this buffer */ + for (i = 0; i < mp->m_quotainfo->qi_dqperchunk; i++) { + ddq = &d[i].dd_diskdq; + error = xfs_qm_dqcheck(mp, ddq, firstid + i, + dqp->dq_flags & XFS_DQ_ALLTYPES, + XFS_QMOPT_DQREPAIR, "xfs_qm_dqrepair"); + if (error) { + /* repair failed, we're screwed */ + xfs_trans_brelse(tp, *bpp); + return XFS_ERROR(EIO); + } + } + + return 0; +} + /* * Maps a dquot to the buffer containing its on-disk version. * This returns a ptr to the buffer containing the on-disk dquot @@ -378,7 +461,6 @@ xfs_qm_dqtobp( xfs_buf_t *bp; xfs_inode_t *quotip = XFS_DQ_TO_QIP(dqp); xfs_mount_t *mp = dqp->q_mount; - xfs_disk_dquot_t *ddq; xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id); xfs_trans_t *tp = (tpp ? *tpp : NULL); @@ -439,33 +521,24 @@ xfs_qm_dqtobp( error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, dqp->q_blkno, mp->m_quotainfo->qi_dqchunklen, - 0, &bp, NULL); - if (error || !bp) - return XFS_ERROR(error); - } + 0, &bp, xfs_dquot_read_verify); - ASSERT(xfs_buf_islocked(bp)); - - /* - * calculate the location of the dquot inside the buffer. - */ - ddq = bp->b_addr + dqp->q_bufoffset; + if (error == EFSCORRUPTED && (flags & XFS_QMOPT_DQREPAIR)) { + xfs_dqid_t firstid = (xfs_dqid_t)map.br_startoff * + mp->m_quotainfo->qi_dqperchunk; + ASSERT(bp == NULL); + error = xfs_qm_dqrepair(mp, tp, dqp, firstid, &bp); + } - /* - * A simple sanity check in case we got a corrupted dquot... - */ - error = xfs_qm_dqcheck(mp, ddq, id, dqp->dq_flags & XFS_DQ_ALLTYPES, - flags & (XFS_QMOPT_DQREPAIR|XFS_QMOPT_DOWARN), - "dqtobp"); - if (error) { - if (!(flags & XFS_QMOPT_DQREPAIR)) { - xfs_trans_brelse(tp, bp); - return XFS_ERROR(EIO); + if (error) { + ASSERT(bp == NULL); + return XFS_ERROR(error); } } + ASSERT(xfs_buf_islocked(bp)); *O_bpp = bp; - *O_ddpp = ddq; + *O_ddpp = bp->b_addr + dqp->q_bufoffset; return (0); } diff --git a/fs/xfs/xfs_dquot.h b/fs/xfs/xfs_dquot.h index 7d20af27346d..a08ba92d7da0 100644 --- a/fs/xfs/xfs_dquot.h +++ b/fs/xfs/xfs_dquot.h @@ -140,6 +140,7 @@ static inline xfs_dquot_t *xfs_inode_dquot(struct xfs_inode *ip, int type) extern int xfs_qm_dqread(struct xfs_mount *, xfs_dqid_t, uint, uint, struct xfs_dquot **); +extern void xfs_dquot_read_verify(struct xfs_buf *bp); extern void xfs_qm_dqdestroy(xfs_dquot_t *); extern int xfs_qm_dqflush(struct xfs_dquot *, struct xfs_buf **); extern void xfs_qm_dqunpin_wait(xfs_dquot_t *); diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c index 688f608b3668..a6dfb97490cc 100644 --- a/fs/xfs/xfs_qm.c +++ b/fs/xfs/xfs_qm.c @@ -892,7 +892,8 @@ xfs_qm_dqiter_bufs( while (blkcnt--) { error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, XFS_FSB_TO_DADDR(mp, bno), - mp->m_quotainfo->qi_dqchunklen, 0, &bp, NULL); + mp->m_quotainfo->qi_dqchunklen, 0, &bp, + xfs_dquot_read_verify); if (error) break; |