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linux/fs/xfs/scrub/quota.c
Darrick J. Wong 8ef34723ef xfs: add missing early termination checks to record scrubbing functions 
Scrubbing directories, quotas, and fs counters all involve iterating
some collection of metadata items.  The per-item scrub functions for
these three are missing some of the components they need to be able to
check for a fatal signal and terminate early.

Per-item scrub functions need to call xchk_should_terminate to look for
fatal signals, and they need to check the scrub context's corruption
flag because there's no point in continuing a scan once we've decided
the data structure is bad.  Add both of these where missing.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
2019-11-06 08:07:41 -08:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_log_format.h"
#include "xfs_trans.h"
#include "xfs_inode.h"
#include "xfs_quota.h"
#include "xfs_qm.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
/* Convert a scrub type code to a DQ flag, or return 0 if error. */
static inline uint
xchk_quota_to_dqtype(
struct xfs_scrub *sc)
{
switch (sc->sm->sm_type) {
case XFS_SCRUB_TYPE_UQUOTA:
return XFS_DQ_USER;
case XFS_SCRUB_TYPE_GQUOTA:
return XFS_DQ_GROUP;
case XFS_SCRUB_TYPE_PQUOTA:
return XFS_DQ_PROJ;
default:
return 0;
}
}
/* Set us up to scrub a quota. */
int
xchk_setup_quota(
struct xfs_scrub *sc,
struct xfs_inode *ip)
{
uint dqtype;
int error;
if (!XFS_IS_QUOTA_RUNNING(sc->mp) || !XFS_IS_QUOTA_ON(sc->mp))
return -ENOENT;
dqtype = xchk_quota_to_dqtype(sc);
if (dqtype == 0)
return -EINVAL;
sc->flags |= XCHK_HAS_QUOTAOFFLOCK;
mutex_lock(&sc->mp->m_quotainfo->qi_quotaofflock);
if (!xfs_this_quota_on(sc->mp, dqtype))
return -ENOENT;
error = xchk_setup_fs(sc, ip);
if (error)
return error;
sc->ip = xfs_quota_inode(sc->mp, dqtype);
xfs_ilock(sc->ip, XFS_ILOCK_EXCL);
sc->ilock_flags = XFS_ILOCK_EXCL;
return 0;
}
/* Quotas. */
struct xchk_quota_info {
struct xfs_scrub *sc;
xfs_dqid_t last_id;
};
/* Scrub the fields in an individual quota item. */
STATIC int
xchk_quota_item(
struct xfs_dquot *dq,
uint dqtype,
void *priv)
{
struct xchk_quota_info *sqi = priv;
struct xfs_scrub *sc = sqi->sc;
struct xfs_mount *mp = sc->mp;
struct xfs_disk_dquot *d = &dq->q_core;
struct xfs_quotainfo *qi = mp->m_quotainfo;
xfs_fileoff_t offset;
unsigned long long bsoft;
unsigned long long isoft;
unsigned long long rsoft;
unsigned long long bhard;
unsigned long long ihard;
unsigned long long rhard;
unsigned long long bcount;
unsigned long long icount;
unsigned long long rcount;
xfs_ino_t fs_icount;
xfs_dqid_t id = be32_to_cpu(d->d_id);
int error = 0;
if (xchk_should_terminate(sc, &error))
return error;
/*
* Except for the root dquot, the actual dquot we got must either have
* the same or higher id as we saw before.
*/
offset = id / qi->qi_dqperchunk;
if (id && id <= sqi->last_id)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
sqi->last_id = id;
/* Did we get the dquot type we wanted? */
if (dqtype != (d->d_flags & XFS_DQ_ALLTYPES))
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
if (d->d_pad0 != cpu_to_be32(0) || d->d_pad != cpu_to_be16(0))
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
/* Check the limits. */
bhard = be64_to_cpu(d->d_blk_hardlimit);
ihard = be64_to_cpu(d->d_ino_hardlimit);
rhard = be64_to_cpu(d->d_rtb_hardlimit);
bsoft = be64_to_cpu(d->d_blk_softlimit);
isoft = be64_to_cpu(d->d_ino_softlimit);
rsoft = be64_to_cpu(d->d_rtb_softlimit);
/*
* Warn if the hard limits are larger than the fs.
* Administrators can do this, though in production this seems
* suspect, which is why we flag it for review.
*
* Complain about corruption if the soft limit is greater than
* the hard limit.
*/
if (bhard > mp->m_sb.sb_dblocks)
xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
if (bsoft > bhard)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
if (ihard > M_IGEO(mp)->maxicount)
xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
if (isoft > ihard)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
if (rhard > mp->m_sb.sb_rblocks)
xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
if (rsoft > rhard)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
/* Check the resource counts. */
bcount = be64_to_cpu(d->d_bcount);
icount = be64_to_cpu(d->d_icount);
rcount = be64_to_cpu(d->d_rtbcount);
fs_icount = percpu_counter_sum(&mp->m_icount);
/*
* Check that usage doesn't exceed physical limits. However, on
* a reflink filesystem we're allowed to exceed physical space
* if there are no quota limits.
*/
if (xfs_sb_version_hasreflink(&mp->m_sb)) {
if (mp->m_sb.sb_dblocks < bcount)
xchk_fblock_set_warning(sc, XFS_DATA_FORK,
offset);
} else {
if (mp->m_sb.sb_dblocks < bcount)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK,
offset);
}
if (icount > fs_icount || rcount > mp->m_sb.sb_rblocks)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
/*
* We can violate the hard limits if the admin suddenly sets a
* lower limit than the actual usage. However, we flag it for
* admin review.
*/
if (id != 0 && bhard != 0 && bcount > bhard)
xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
if (id != 0 && ihard != 0 && icount > ihard)
xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
if (id != 0 && rhard != 0 && rcount > rhard)
xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
return -EFSCORRUPTED;
return 0;
}
/* Check the quota's data fork. */
STATIC int
xchk_quota_data_fork(
struct xfs_scrub *sc)
{
struct xfs_bmbt_irec irec = { 0 };
struct xfs_iext_cursor icur;
struct xfs_quotainfo *qi = sc->mp->m_quotainfo;
struct xfs_ifork *ifp;
xfs_fileoff_t max_dqid_off;
int error = 0;
/* Invoke the fork scrubber. */
error = xchk_metadata_inode_forks(sc);
if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
return error;
/* Check for data fork problems that apply only to quota files. */
max_dqid_off = ((xfs_dqid_t)-1) / qi->qi_dqperchunk;
ifp = XFS_IFORK_PTR(sc->ip, XFS_DATA_FORK);
for_each_xfs_iext(ifp, &icur, &irec) {
if (xchk_should_terminate(sc, &error))
break;
/*
* delalloc extents or blocks mapped above the highest
* quota id shouldn't happen.
*/
if (isnullstartblock(irec.br_startblock) ||
irec.br_startoff > max_dqid_off ||
irec.br_startoff + irec.br_blockcount - 1 > max_dqid_off) {
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK,
irec.br_startoff);
break;
}
}
return error;
}
/* Scrub all of a quota type's items. */
int
xchk_quota(
struct xfs_scrub *sc)
{
struct xchk_quota_info sqi;
struct xfs_mount *mp = sc->mp;
struct xfs_quotainfo *qi = mp->m_quotainfo;
uint dqtype;
int error = 0;
dqtype = xchk_quota_to_dqtype(sc);
/* Look for problem extents. */
error = xchk_quota_data_fork(sc);
if (error)
goto out;
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
goto out;
/*
* Check all the quota items. Now that we've checked the quota inode
* data fork we have to drop ILOCK_EXCL to use the regular dquot
* functions.
*/
xfs_iunlock(sc->ip, sc->ilock_flags);
sc->ilock_flags = 0;
sqi.sc = sc;
sqi.last_id = 0;
error = xfs_qm_dqiterate(mp, dqtype, xchk_quota_item, &sqi);
sc->ilock_flags = XFS_ILOCK_EXCL;
xfs_ilock(sc->ip, sc->ilock_flags);
if (!xchk_fblock_process_error(sc, XFS_DATA_FORK,
sqi.last_id * qi->qi_dqperchunk, &error))
goto out;
out:
return error;
}
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