313 lines
8.2 KiB
C
313 lines
8.2 KiB
C
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/*
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* Copyright (c) 2000-2006 Silicon Graphics, Inc.
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* Copyright (c) 2013 Red Hat, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_quota.h"
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#include "xfs_trans.h"
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#include "xfs_qm.h"
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#include "xfs_error.h"
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#include "xfs_cksum.h"
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#include "xfs_trace.h"
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int
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xfs_calc_dquots_per_chunk(
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unsigned int nbblks) /* basic block units */
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{
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unsigned int ndquots;
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ASSERT(nbblks > 0);
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ndquots = BBTOB(nbblks);
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do_div(ndquots, sizeof(xfs_dqblk_t));
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return ndquots;
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}
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/*
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* Do some primitive error checking on ondisk dquot data structures.
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*/
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int
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xfs_dqcheck(
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struct xfs_mount *mp,
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xfs_disk_dquot_t *ddq,
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xfs_dqid_t id,
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uint type, /* used only when IO_dorepair is true */
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uint flags,
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const char *str)
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{
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xfs_dqblk_t *d = (xfs_dqblk_t *)ddq;
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int errs = 0;
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/*
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* We can encounter an uninitialized dquot buffer for 2 reasons:
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* 1. If we crash while deleting the quotainode(s), and those blks got
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* used for user data. This is because we take the path of regular
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* file deletion; however, the size field of quotainodes is never
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* updated, so all the tricks that we play in itruncate_finish
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* don't quite matter.
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*
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* 2. We don't play the quota buffers when there's a quotaoff logitem.
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* But the allocation will be replayed so we'll end up with an
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* uninitialized quota block.
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*
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* This is all fine; things are still consistent, and we haven't lost
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* any quota information. Just don't complain about bad dquot blks.
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*/
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if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC)) {
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if (flags & XFS_QMOPT_DOWARN)
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xfs_alert(mp,
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"%s : XFS dquot ID 0x%x, magic 0x%x != 0x%x",
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str, id, be16_to_cpu(ddq->d_magic), XFS_DQUOT_MAGIC);
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errs++;
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}
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if (ddq->d_version != XFS_DQUOT_VERSION) {
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if (flags & XFS_QMOPT_DOWARN)
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xfs_alert(mp,
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"%s : XFS dquot ID 0x%x, version 0x%x != 0x%x",
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str, id, ddq->d_version, XFS_DQUOT_VERSION);
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errs++;
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}
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if (ddq->d_flags != XFS_DQ_USER &&
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ddq->d_flags != XFS_DQ_PROJ &&
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ddq->d_flags != XFS_DQ_GROUP) {
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if (flags & XFS_QMOPT_DOWARN)
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xfs_alert(mp,
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"%s : XFS dquot ID 0x%x, unknown flags 0x%x",
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str, id, ddq->d_flags);
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errs++;
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}
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if (id != -1 && id != be32_to_cpu(ddq->d_id)) {
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if (flags & XFS_QMOPT_DOWARN)
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xfs_alert(mp,
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"%s : ondisk-dquot 0x%p, ID mismatch: "
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"0x%x expected, found id 0x%x",
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str, ddq, id, be32_to_cpu(ddq->d_id));
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errs++;
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}
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if (!errs && ddq->d_id) {
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if (ddq->d_blk_softlimit &&
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be64_to_cpu(ddq->d_bcount) >
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be64_to_cpu(ddq->d_blk_softlimit)) {
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if (!ddq->d_btimer) {
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if (flags & XFS_QMOPT_DOWARN)
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xfs_alert(mp,
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"%s : Dquot ID 0x%x (0x%p) BLK TIMER NOT STARTED",
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str, (int)be32_to_cpu(ddq->d_id), ddq);
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errs++;
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}
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}
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if (ddq->d_ino_softlimit &&
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be64_to_cpu(ddq->d_icount) >
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be64_to_cpu(ddq->d_ino_softlimit)) {
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if (!ddq->d_itimer) {
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if (flags & XFS_QMOPT_DOWARN)
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xfs_alert(mp,
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"%s : Dquot ID 0x%x (0x%p) INODE TIMER NOT STARTED",
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str, (int)be32_to_cpu(ddq->d_id), ddq);
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errs++;
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}
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}
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if (ddq->d_rtb_softlimit &&
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be64_to_cpu(ddq->d_rtbcount) >
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be64_to_cpu(ddq->d_rtb_softlimit)) {
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if (!ddq->d_rtbtimer) {
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if (flags & XFS_QMOPT_DOWARN)
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xfs_alert(mp,
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"%s : Dquot ID 0x%x (0x%p) RTBLK TIMER NOT STARTED",
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str, (int)be32_to_cpu(ddq->d_id), ddq);
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errs++;
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}
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}
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}
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if (!errs || !(flags & XFS_QMOPT_DQREPAIR))
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return errs;
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if (flags & XFS_QMOPT_DOWARN)
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xfs_notice(mp, "Re-initializing dquot ID 0x%x", id);
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/*
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* Typically, a repair is only requested by quotacheck.
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*/
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ASSERT(id != -1);
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ASSERT(flags & XFS_QMOPT_DQREPAIR);
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memset(d, 0, sizeof(xfs_dqblk_t));
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d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
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d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
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d->dd_diskdq.d_flags = type;
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d->dd_diskdq.d_id = cpu_to_be32(id);
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if (xfs_sb_version_hascrc(&mp->m_sb)) {
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uuid_copy(&d->dd_uuid, &mp->m_sb.sb_meta_uuid);
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xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk),
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XFS_DQUOT_CRC_OFF);
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}
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return errs;
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}
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STATIC bool
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xfs_dquot_buf_verify_crc(
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struct xfs_mount *mp,
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struct xfs_buf *bp)
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{
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struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr;
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int ndquots;
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int i;
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return true;
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/*
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* if we are in log recovery, the quota subsystem has not been
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* initialised so we have no quotainfo structure. In that case, we need
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* to manually calculate the number of dquots in the buffer.
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*/
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if (mp->m_quotainfo)
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ndquots = mp->m_quotainfo->qi_dqperchunk;
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else
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ndquots = xfs_calc_dquots_per_chunk(bp->b_length);
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for (i = 0; i < ndquots; i++, d++) {
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if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk),
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XFS_DQUOT_CRC_OFF))
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return false;
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if (!uuid_equal(&d->dd_uuid, &mp->m_sb.sb_meta_uuid))
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return false;
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}
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return true;
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}
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STATIC bool
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xfs_dquot_buf_verify(
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struct xfs_mount *mp,
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struct xfs_buf *bp,
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int warn)
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{
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struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr;
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xfs_dqid_t id = 0;
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int ndquots;
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int i;
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/*
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* if we are in log recovery, the quota subsystem has not been
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* initialised so we have no quotainfo structure. In that case, we need
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* to manually calculate the number of dquots in the buffer.
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*/
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if (mp->m_quotainfo)
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ndquots = mp->m_quotainfo->qi_dqperchunk;
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else
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ndquots = xfs_calc_dquots_per_chunk(bp->b_length);
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/*
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* On the first read of the buffer, verify that each dquot is valid.
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* We don't know what the id of the dquot is supposed to be, just that
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* they should be increasing monotonically within the buffer. If the
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* first id is corrupt, then it will fail on the second dquot in the
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* buffer so corruptions could point to the wrong dquot in this case.
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*/
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for (i = 0; i < ndquots; i++) {
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struct xfs_disk_dquot *ddq;
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int error;
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ddq = &d[i].dd_diskdq;
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if (i == 0)
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id = be32_to_cpu(ddq->d_id);
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error = xfs_dqcheck(mp, ddq, id + i, 0, warn, __func__);
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if (error)
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return false;
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}
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return true;
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}
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static void
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xfs_dquot_buf_read_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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if (!xfs_dquot_buf_verify_crc(mp, bp))
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xfs_buf_ioerror(bp, -EFSBADCRC);
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else if (!xfs_dquot_buf_verify(mp, bp, XFS_QMOPT_DOWARN))
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xfs_buf_ioerror(bp, -EFSCORRUPTED);
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if (bp->b_error)
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xfs_verifier_error(bp);
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}
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/*
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* readahead errors are silent and simply leave the buffer as !done so a real
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* read will then be run with the xfs_dquot_buf_ops verifier. See
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* xfs_inode_buf_verify() for why we use EIO and ~XBF_DONE here rather than
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* reporting the failure.
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*/
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static void
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xfs_dquot_buf_readahead_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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if (!xfs_dquot_buf_verify_crc(mp, bp) ||
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!xfs_dquot_buf_verify(mp, bp, 0)) {
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xfs_buf_ioerror(bp, -EIO);
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bp->b_flags &= ~XBF_DONE;
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}
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}
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/*
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* we don't calculate the CRC here as that is done when the dquot is flushed to
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* the buffer after the update is done. This ensures that the dquot in the
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* buffer always has an up-to-date CRC value.
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*/
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static void
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xfs_dquot_buf_write_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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if (!xfs_dquot_buf_verify(mp, bp, XFS_QMOPT_DOWARN)) {
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xfs_buf_ioerror(bp, -EFSCORRUPTED);
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xfs_verifier_error(bp);
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return;
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}
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}
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const struct xfs_buf_ops xfs_dquot_buf_ops = {
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.name = "xfs_dquot",
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.verify_read = xfs_dquot_buf_read_verify,
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.verify_write = xfs_dquot_buf_write_verify,
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};
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const struct xfs_buf_ops xfs_dquot_buf_ra_ops = {
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.name = "xfs_dquot_ra",
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.verify_read = xfs_dquot_buf_readahead_verify,
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.verify_write = xfs_dquot_buf_write_verify,
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};
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