| /* |
| * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
| * Copyright (c) 2013 Red Hat, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #include "xfs.h" |
| #include "xfs_fs.h" |
| #include "xfs_format.h" |
| #include "xfs_log_format.h" |
| #include "xfs_trans_resv.h" |
| #include "xfs_bit.h" |
| #include "xfs_sb.h" |
| #include "xfs_ag.h" |
| #include "xfs_mount.h" |
| #include "xfs_bmap_btree.h" |
| #include "xfs_inode.h" |
| #include "xfs_quota.h" |
| #include "xfs_trans.h" |
| #include "xfs_qm.h" |
| #include "xfs_error.h" |
| #include "xfs_cksum.h" |
| #include "xfs_trace.h" |
| |
| int |
| xfs_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; |
| } |
| |
| /* |
| * Do some primitive error checking on ondisk dquot data structures. |
| */ |
| int |
| xfs_dqcheck( |
| struct xfs_mount *mp, |
| xfs_disk_dquot_t *ddq, |
| xfs_dqid_t id, |
| uint type, /* used only when IO_dorepair is true */ |
| uint flags, |
| char *str) |
| { |
| xfs_dqblk_t *d = (xfs_dqblk_t *)ddq; |
| int errs = 0; |
| |
| /* |
| * We can encounter an uninitialized dquot buffer for 2 reasons: |
| * 1. If we crash while deleting the quotainode(s), and those blks got |
| * used for user data. This is because we take the path of regular |
| * file deletion; however, the size field of quotainodes is never |
| * updated, so all the tricks that we play in itruncate_finish |
| * don't quite matter. |
| * |
| * 2. We don't play the quota buffers when there's a quotaoff logitem. |
| * But the allocation will be replayed so we'll end up with an |
| * uninitialized quota block. |
| * |
| * This is all fine; things are still consistent, and we haven't lost |
| * any quota information. Just don't complain about bad dquot blks. |
| */ |
| if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC)) { |
| if (flags & XFS_QMOPT_DOWARN) |
| xfs_alert(mp, |
| "%s : XFS dquot ID 0x%x, magic 0x%x != 0x%x", |
| str, id, be16_to_cpu(ddq->d_magic), XFS_DQUOT_MAGIC); |
| errs++; |
| } |
| if (ddq->d_version != XFS_DQUOT_VERSION) { |
| if (flags & XFS_QMOPT_DOWARN) |
| xfs_alert(mp, |
| "%s : XFS dquot ID 0x%x, version 0x%x != 0x%x", |
| str, id, ddq->d_version, XFS_DQUOT_VERSION); |
| errs++; |
| } |
| |
| if (ddq->d_flags != XFS_DQ_USER && |
| ddq->d_flags != XFS_DQ_PROJ && |
| ddq->d_flags != XFS_DQ_GROUP) { |
| if (flags & XFS_QMOPT_DOWARN) |
| xfs_alert(mp, |
| "%s : XFS dquot ID 0x%x, unknown flags 0x%x", |
| str, id, ddq->d_flags); |
| errs++; |
| } |
| |
| if (id != -1 && id != be32_to_cpu(ddq->d_id)) { |
| if (flags & XFS_QMOPT_DOWARN) |
| xfs_alert(mp, |
| "%s : ondisk-dquot 0x%p, ID mismatch: " |
| "0x%x expected, found id 0x%x", |
| str, ddq, id, be32_to_cpu(ddq->d_id)); |
| errs++; |
| } |
| |
| if (!errs && ddq->d_id) { |
| if (ddq->d_blk_softlimit && |
| be64_to_cpu(ddq->d_bcount) > |
| be64_to_cpu(ddq->d_blk_softlimit)) { |
| if (!ddq->d_btimer) { |
| if (flags & XFS_QMOPT_DOWARN) |
| xfs_alert(mp, |
| "%s : Dquot ID 0x%x (0x%p) BLK TIMER NOT STARTED", |
| str, (int)be32_to_cpu(ddq->d_id), ddq); |
| errs++; |
| } |
| } |
| if (ddq->d_ino_softlimit && |
| be64_to_cpu(ddq->d_icount) > |
| be64_to_cpu(ddq->d_ino_softlimit)) { |
| if (!ddq->d_itimer) { |
| if (flags & XFS_QMOPT_DOWARN) |
| xfs_alert(mp, |
| "%s : Dquot ID 0x%x (0x%p) INODE TIMER NOT STARTED", |
| str, (int)be32_to_cpu(ddq->d_id), ddq); |
| errs++; |
| } |
| } |
| if (ddq->d_rtb_softlimit && |
| be64_to_cpu(ddq->d_rtbcount) > |
| be64_to_cpu(ddq->d_rtb_softlimit)) { |
| if (!ddq->d_rtbtimer) { |
| if (flags & XFS_QMOPT_DOWARN) |
| xfs_alert(mp, |
| "%s : Dquot ID 0x%x (0x%p) RTBLK TIMER NOT STARTED", |
| str, (int)be32_to_cpu(ddq->d_id), ddq); |
| errs++; |
| } |
| } |
| } |
| |
| if (!errs || !(flags & XFS_QMOPT_DQREPAIR)) |
| return errs; |
| |
| if (flags & XFS_QMOPT_DOWARN) |
| xfs_notice(mp, "Re-initializing dquot ID 0x%x", id); |
| |
| /* |
| * Typically, a repair is only requested by quotacheck. |
| */ |
| ASSERT(id != -1); |
| ASSERT(flags & XFS_QMOPT_DQREPAIR); |
| memset(d, 0, sizeof(xfs_dqblk_t)); |
| |
| d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC); |
| d->dd_diskdq.d_version = XFS_DQUOT_VERSION; |
| d->dd_diskdq.d_flags = type; |
| d->dd_diskdq.d_id = cpu_to_be32(id); |
| |
| if (xfs_sb_version_hascrc(&mp->m_sb)) { |
| uuid_copy(&d->dd_uuid, &mp->m_sb.sb_uuid); |
| xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk), |
| XFS_DQUOT_CRC_OFF); |
| } |
| |
| return errs; |
| } |
| |
| 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_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), |
| XFS_DQUOT_CRC_OFF)) |
| 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_dqblk *d = (struct xfs_dqblk *)bp->b_addr; |
| 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_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 < ndquots; i++) { |
| struct xfs_disk_dquot *ddq; |
| int error; |
| |
| ddq = &d[i].dd_diskdq; |
| |
| if (i == 0) |
| id = be32_to_cpu(ddq->d_id); |
| |
| error = xfs_dqcheck(mp, ddq, id + i, 0, XFS_QMOPT_DOWARN, |
| "xfs_dquot_buf_verify"); |
| if (error) |
| return false; |
| } |
| return true; |
| } |
| |
| static void |
| xfs_dquot_buf_read_verify( |
| struct xfs_buf *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); |
| } |
| } |
| |
| /* |
| * we don't calculate the CRC here as that is done when the dquot is flushed to |
| * the buffer after the update is done. This ensures that the dquot in the |
| * buffer always has an up-to-date CRC value. |
| */ |
| void |
| xfs_dquot_buf_write_verify( |
| struct xfs_buf *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; |
| } |
| } |
| |
| const struct xfs_buf_ops xfs_dquot_buf_ops = { |
| .verify_read = xfs_dquot_buf_read_verify, |
| .verify_write = xfs_dquot_buf_write_verify, |
| }; |
| |