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1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2017-2023 Oracle.  All Rights Reserved.
4  * Author: Darrick J. Wong <[email protected]>
5  */
6 #include "xfs.h"
7 #include "xfs_fs.h"
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_trans_resv.h"
11 #include "xfs_mount.h"
12 #include "xfs_log_format.h"
13 #include "xfs_trans.h"
14 #include "xfs_inode.h"
15 #include "xfs_quota.h"
16 #include "xfs_qm.h"
17 #include "xfs_bmap.h"
18 #include "scrub/scrub.h"
19 #include "scrub/common.h"
20
21 /* Convert a scrub type code to a DQ flag, or return 0 if error. */
22 static inline xfs_dqtype_t
23 xchk_quota_to_dqtype(
24         struct xfs_scrub        *sc)
25 {
26         switch (sc->sm->sm_type) {
27         case XFS_SCRUB_TYPE_UQUOTA:
28                 return XFS_DQTYPE_USER;
29         case XFS_SCRUB_TYPE_GQUOTA:
30                 return XFS_DQTYPE_GROUP;
31         case XFS_SCRUB_TYPE_PQUOTA:
32                 return XFS_DQTYPE_PROJ;
33         default:
34                 return 0;
35         }
36 }
37
38 /* Set us up to scrub a quota. */
39 int
40 xchk_setup_quota(
41         struct xfs_scrub        *sc)
42 {
43         xfs_dqtype_t            dqtype;
44         int                     error;
45
46         if (!XFS_IS_QUOTA_ON(sc->mp))
47                 return -ENOENT;
48
49         dqtype = xchk_quota_to_dqtype(sc);
50         if (dqtype == 0)
51                 return -EINVAL;
52
53         if (!xfs_this_quota_on(sc->mp, dqtype))
54                 return -ENOENT;
55
56         if (xchk_need_intent_drain(sc))
57                 xchk_fsgates_enable(sc, XCHK_FSGATES_DRAIN);
58
59         error = xchk_setup_fs(sc);
60         if (error)
61                 return error;
62
63         error = xchk_install_live_inode(sc, xfs_quota_inode(sc->mp, dqtype));
64         if (error)
65                 return error;
66
67         xchk_ilock(sc, XFS_ILOCK_EXCL);
68         return 0;
69 }
70
71 /* Quotas. */
72
73 struct xchk_quota_info {
74         struct xfs_scrub        *sc;
75         xfs_dqid_t              last_id;
76 };
77
78 /* Scrub the fields in an individual quota item. */
79 STATIC int
80 xchk_quota_item(
81         struct xfs_dquot        *dq,
82         xfs_dqtype_t            dqtype,
83         void                    *priv)
84 {
85         struct xchk_quota_info  *sqi = priv;
86         struct xfs_scrub        *sc = sqi->sc;
87         struct xfs_mount        *mp = sc->mp;
88         struct xfs_quotainfo    *qi = mp->m_quotainfo;
89         xfs_fileoff_t           offset;
90         xfs_ino_t               fs_icount;
91         int                     error = 0;
92
93         if (xchk_should_terminate(sc, &error))
94                 return error;
95
96         /*
97          * Except for the root dquot, the actual dquot we got must either have
98          * the same or higher id as we saw before.
99          */
100         offset = dq->q_id / qi->qi_dqperchunk;
101         if (dq->q_id && dq->q_id <= sqi->last_id)
102                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
103
104         sqi->last_id = dq->q_id;
105
106         /*
107          * Warn if the hard limits are larger than the fs.
108          * Administrators can do this, though in production this seems
109          * suspect, which is why we flag it for review.
110          *
111          * Complain about corruption if the soft limit is greater than
112          * the hard limit.
113          */
114         if (dq->q_blk.hardlimit > mp->m_sb.sb_dblocks)
115                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
116         if (dq->q_blk.softlimit > dq->q_blk.hardlimit)
117                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
118
119         if (dq->q_ino.hardlimit > M_IGEO(mp)->maxicount)
120                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
121         if (dq->q_ino.softlimit > dq->q_ino.hardlimit)
122                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
123
124         if (dq->q_rtb.hardlimit > mp->m_sb.sb_rblocks)
125                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
126         if (dq->q_rtb.softlimit > dq->q_rtb.hardlimit)
127                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
128
129         /* Check the resource counts. */
130         fs_icount = percpu_counter_sum(&mp->m_icount);
131
132         /*
133          * Check that usage doesn't exceed physical limits.  However, on
134          * a reflink filesystem we're allowed to exceed physical space
135          * if there are no quota limits.
136          */
137         if (xfs_has_reflink(mp)) {
138                 if (mp->m_sb.sb_dblocks < dq->q_blk.count)
139                         xchk_fblock_set_warning(sc, XFS_DATA_FORK,
140                                         offset);
141         } else {
142                 if (mp->m_sb.sb_dblocks < dq->q_blk.count)
143                         xchk_fblock_set_corrupt(sc, XFS_DATA_FORK,
144                                         offset);
145         }
146         if (dq->q_ino.count > fs_icount || dq->q_rtb.count > mp->m_sb.sb_rblocks)
147                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
148
149         /*
150          * We can violate the hard limits if the admin suddenly sets a
151          * lower limit than the actual usage.  However, we flag it for
152          * admin review.
153          */
154         if (dq->q_id == 0)
155                 goto out;
156
157         if (dq->q_blk.hardlimit != 0 &&
158             dq->q_blk.count > dq->q_blk.hardlimit)
159                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
160
161         if (dq->q_ino.hardlimit != 0 &&
162             dq->q_ino.count > dq->q_ino.hardlimit)
163                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
164
165         if (dq->q_rtb.hardlimit != 0 &&
166             dq->q_rtb.count > dq->q_rtb.hardlimit)
167                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
168
169 out:
170         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
171                 return -ECANCELED;
172
173         return 0;
174 }
175
176 /* Check the quota's data fork. */
177 STATIC int
178 xchk_quota_data_fork(
179         struct xfs_scrub        *sc)
180 {
181         struct xfs_bmbt_irec    irec = { 0 };
182         struct xfs_iext_cursor  icur;
183         struct xfs_quotainfo    *qi = sc->mp->m_quotainfo;
184         struct xfs_ifork        *ifp;
185         xfs_fileoff_t           max_dqid_off;
186         int                     error = 0;
187
188         /* Invoke the fork scrubber. */
189         error = xchk_metadata_inode_forks(sc);
190         if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
191                 return error;
192
193         /* Check for data fork problems that apply only to quota files. */
194         max_dqid_off = ((xfs_dqid_t)-1) / qi->qi_dqperchunk;
195         ifp = xfs_ifork_ptr(sc->ip, XFS_DATA_FORK);
196         for_each_xfs_iext(ifp, &icur, &irec) {
197                 if (xchk_should_terminate(sc, &error))
198                         break;
199
200                 /*
201                  * delalloc/unwritten extents or blocks mapped above the highest
202                  * quota id shouldn't happen.
203                  */
204                 if (!xfs_bmap_is_written_extent(&irec) ||
205                     irec.br_startoff > max_dqid_off ||
206                     irec.br_startoff + irec.br_blockcount - 1 > max_dqid_off) {
207                         xchk_fblock_set_corrupt(sc, XFS_DATA_FORK,
208                                         irec.br_startoff);
209                         break;
210                 }
211         }
212
213         return error;
214 }
215
216 /* Scrub all of a quota type's items. */
217 int
218 xchk_quota(
219         struct xfs_scrub        *sc)
220 {
221         struct xchk_quota_info  sqi;
222         struct xfs_mount        *mp = sc->mp;
223         struct xfs_quotainfo    *qi = mp->m_quotainfo;
224         xfs_dqtype_t            dqtype;
225         int                     error = 0;
226
227         dqtype = xchk_quota_to_dqtype(sc);
228
229         /* Look for problem extents. */
230         error = xchk_quota_data_fork(sc);
231         if (error)
232                 goto out;
233         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
234                 goto out;
235
236         /*
237          * Check all the quota items.  Now that we've checked the quota inode
238          * data fork we have to drop ILOCK_EXCL to use the regular dquot
239          * functions.
240          */
241         xchk_iunlock(sc, sc->ilock_flags);
242         sqi.sc = sc;
243         sqi.last_id = 0;
244         error = xfs_qm_dqiterate(mp, dqtype, xchk_quota_item, &sqi);
245         xchk_ilock(sc, XFS_ILOCK_EXCL);
246         if (error == -ECANCELED)
247                 error = 0;
248         if (!xchk_fblock_process_error(sc, XFS_DATA_FORK,
249                         sqi.last_id * qi->qi_dqperchunk, &error))
250                 goto out;
251
252 out:
253         return error;
254 }
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