1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
// 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_quotainfo *qi = mp->m_quotainfo;
xfs_fileoff_t offset;
xfs_ino_t fs_icount;
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 = dq->q_id / qi->qi_dqperchunk;
if (dq->q_id && dq->q_id <= sqi->last_id)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
sqi->last_id = dq->q_id;
/*
* 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 (dq->q_blk.hardlimit > mp->m_sb.sb_dblocks)
xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
if (dq->q_blk.softlimit > dq->q_blk.hardlimit)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
if (dq->q_ino.hardlimit > M_IGEO(mp)->maxicount)
xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
if (dq->q_ino.softlimit > dq->q_ino.hardlimit)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
if (dq->q_rtb.hardlimit > mp->m_sb.sb_rblocks)
xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
if (dq->q_rtb.softlimit > dq->q_rtb.hardlimit)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
/* Check the resource counts. */
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 < dq->q_blk.count)
xchk_fblock_set_warning(sc, XFS_DATA_FORK,
offset);
} else {
if (mp->m_sb.sb_dblocks < dq->q_blk.count)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK,
offset);
}
if (dq->q_ino.count > fs_icount || dq->q_rtb.count > 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 (dq->q_id == 0)
goto out;
if (dq->q_blk.hardlimit != 0 &&
dq->q_blk.count > dq->q_blk.hardlimit)
xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
if (dq->q_ino.hardlimit != 0 &&
dq->q_ino.count > dq->q_ino.hardlimit)
xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
if (dq->q_rtb.hardlimit != 0 &&
dq->q_rtb.count > dq->q_rtb.hardlimit)
xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
out:
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;
}
|
