1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4 * Copyright (c) 2013 Red Hat, Inc.
5 * All Rights Reserved.
6 */
7 #include "xfs.h"
8 #include "xfs_fs.h"
9 #include "xfs_shared.h"
10 #include "xfs_format.h"
11 #include "xfs_log_format.h"
12 #include "xfs_trans_resv.h"
13 #include "xfs_mount.h"
14 #include "xfs_inode.h"
15 #include "xfs_quota.h"
16 #include "xfs_trans.h"
17 #include "xfs_qm.h"
18 #include "xfs_error.h"
19
20 int
xfs_calc_dquots_per_chunk(unsigned int nbblks)21 xfs_calc_dquots_per_chunk(
22 unsigned int nbblks) /* basic block units */
23 {
24 ASSERT(nbblks > 0);
25 return BBTOB(nbblks) / sizeof(xfs_dqblk_t);
26 }
27
28 /*
29 * Do some primitive error checking on ondisk dquot data structures.
30 *
31 * The xfs_dqblk structure /contains/ the xfs_disk_dquot structure;
32 * we verify them separately because at some points we have only the
33 * smaller xfs_disk_dquot structure available.
34 */
35
36 xfs_failaddr_t
xfs_dquot_verify(struct xfs_mount * mp,struct xfs_disk_dquot * ddq,xfs_dqid_t id)37 xfs_dquot_verify(
38 struct xfs_mount *mp,
39 struct xfs_disk_dquot *ddq,
40 xfs_dqid_t id) /* used only during quotacheck */
41 {
42 __u8 ddq_type;
43
44 /*
45 * We can encounter an uninitialized dquot buffer for 2 reasons:
46 * 1. If we crash while deleting the quotainode(s), and those blks got
47 * used for user data. This is because we take the path of regular
48 * file deletion; however, the size field of quotainodes is never
49 * updated, so all the tricks that we play in itruncate_finish
50 * don't quite matter.
51 *
52 * 2. We don't play the quota buffers when there's a quotaoff logitem.
53 * But the allocation will be replayed so we'll end up with an
54 * uninitialized quota block.
55 *
56 * This is all fine; things are still consistent, and we haven't lost
57 * any quota information. Just don't complain about bad dquot blks.
58 */
59 if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC))
60 return __this_address;
61 if (ddq->d_version != XFS_DQUOT_VERSION)
62 return __this_address;
63
64 if (ddq->d_type & ~XFS_DQTYPE_ANY)
65 return __this_address;
66 ddq_type = ddq->d_type & XFS_DQTYPE_REC_MASK;
67 if (ddq_type != XFS_DQTYPE_USER &&
68 ddq_type != XFS_DQTYPE_PROJ &&
69 ddq_type != XFS_DQTYPE_GROUP)
70 return __this_address;
71
72 if ((ddq->d_type & XFS_DQTYPE_BIGTIME) &&
73 !xfs_has_bigtime(mp))
74 return __this_address;
75
76 if ((ddq->d_type & XFS_DQTYPE_BIGTIME) && !ddq->d_id)
77 return __this_address;
78
79 if (id != -1 && id != be32_to_cpu(ddq->d_id))
80 return __this_address;
81
82 if (!ddq->d_id)
83 return NULL;
84
85 if (ddq->d_blk_softlimit &&
86 be64_to_cpu(ddq->d_bcount) > be64_to_cpu(ddq->d_blk_softlimit) &&
87 !ddq->d_btimer)
88 return __this_address;
89
90 if (ddq->d_ino_softlimit &&
91 be64_to_cpu(ddq->d_icount) > be64_to_cpu(ddq->d_ino_softlimit) &&
92 !ddq->d_itimer)
93 return __this_address;
94
95 if (ddq->d_rtb_softlimit &&
96 be64_to_cpu(ddq->d_rtbcount) > be64_to_cpu(ddq->d_rtb_softlimit) &&
97 !ddq->d_rtbtimer)
98 return __this_address;
99
100 return NULL;
101 }
102
103 xfs_failaddr_t
xfs_dqblk_verify(struct xfs_mount * mp,struct xfs_dqblk * dqb,xfs_dqid_t id)104 xfs_dqblk_verify(
105 struct xfs_mount *mp,
106 struct xfs_dqblk *dqb,
107 xfs_dqid_t id) /* used only during quotacheck */
108 {
109 if (xfs_has_crc(mp) &&
110 !uuid_equal(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid))
111 return __this_address;
112
113 return xfs_dquot_verify(mp, &dqb->dd_diskdq, id);
114 }
115
116 /*
117 * Do some primitive error checking on ondisk dquot data structures.
118 */
119 void
xfs_dqblk_repair(struct xfs_mount * mp,struct xfs_dqblk * dqb,xfs_dqid_t id,xfs_dqtype_t type)120 xfs_dqblk_repair(
121 struct xfs_mount *mp,
122 struct xfs_dqblk *dqb,
123 xfs_dqid_t id,
124 xfs_dqtype_t type)
125 {
126 /*
127 * Typically, a repair is only requested by quotacheck.
128 */
129 ASSERT(id != -1);
130 memset(dqb, 0, sizeof(xfs_dqblk_t));
131
132 dqb->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
133 dqb->dd_diskdq.d_version = XFS_DQUOT_VERSION;
134 dqb->dd_diskdq.d_type = type;
135 dqb->dd_diskdq.d_id = cpu_to_be32(id);
136
137 if (xfs_has_crc(mp)) {
138 uuid_copy(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid);
139 xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk),
140 XFS_DQUOT_CRC_OFF);
141 }
142 }
143
144 STATIC bool
xfs_dquot_buf_verify_crc(struct xfs_mount * mp,struct xfs_buf * bp,bool readahead)145 xfs_dquot_buf_verify_crc(
146 struct xfs_mount *mp,
147 struct xfs_buf *bp,
148 bool readahead)
149 {
150 struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr;
151 int ndquots;
152 int i;
153
154 if (!xfs_has_crc(mp))
155 return true;
156
157 /*
158 * if we are in log recovery, the quota subsystem has not been
159 * initialised so we have no quotainfo structure. In that case, we need
160 * to manually calculate the number of dquots in the buffer.
161 */
162 if (mp->m_quotainfo)
163 ndquots = mp->m_quotainfo->qi_dqperchunk;
164 else
165 ndquots = xfs_calc_dquots_per_chunk(bp->b_length);
166
167 for (i = 0; i < ndquots; i++, d++) {
168 if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk),
169 XFS_DQUOT_CRC_OFF)) {
170 if (!readahead)
171 xfs_buf_verifier_error(bp, -EFSBADCRC, __func__,
172 d, sizeof(*d), __this_address);
173 return false;
174 }
175 }
176 return true;
177 }
178
179 STATIC xfs_failaddr_t
xfs_dquot_buf_verify(struct xfs_mount * mp,struct xfs_buf * bp,bool readahead)180 xfs_dquot_buf_verify(
181 struct xfs_mount *mp,
182 struct xfs_buf *bp,
183 bool readahead)
184 {
185 struct xfs_dqblk *dqb = bp->b_addr;
186 xfs_failaddr_t fa;
187 xfs_dqid_t id = 0;
188 int ndquots;
189 int i;
190
191 /*
192 * if we are in log recovery, the quota subsystem has not been
193 * initialised so we have no quotainfo structure. In that case, we need
194 * to manually calculate the number of dquots in the buffer.
195 */
196 if (mp->m_quotainfo)
197 ndquots = mp->m_quotainfo->qi_dqperchunk;
198 else
199 ndquots = xfs_calc_dquots_per_chunk(bp->b_length);
200
201 /*
202 * On the first read of the buffer, verify that each dquot is valid.
203 * We don't know what the id of the dquot is supposed to be, just that
204 * they should be increasing monotonically within the buffer. If the
205 * first id is corrupt, then it will fail on the second dquot in the
206 * buffer so corruptions could point to the wrong dquot in this case.
207 */
208 for (i = 0; i < ndquots; i++) {
209 struct xfs_disk_dquot *ddq;
210
211 ddq = &dqb[i].dd_diskdq;
212
213 if (i == 0)
214 id = be32_to_cpu(ddq->d_id);
215
216 fa = xfs_dqblk_verify(mp, &dqb[i], id + i);
217 if (fa) {
218 if (!readahead)
219 xfs_buf_verifier_error(bp, -EFSCORRUPTED,
220 __func__, &dqb[i],
221 sizeof(struct xfs_dqblk), fa);
222 return fa;
223 }
224 }
225
226 return NULL;
227 }
228
229 static xfs_failaddr_t
xfs_dquot_buf_verify_struct(struct xfs_buf * bp)230 xfs_dquot_buf_verify_struct(
231 struct xfs_buf *bp)
232 {
233 struct xfs_mount *mp = bp->b_mount;
234
235 return xfs_dquot_buf_verify(mp, bp, false);
236 }
237
238 static void
xfs_dquot_buf_read_verify(struct xfs_buf * bp)239 xfs_dquot_buf_read_verify(
240 struct xfs_buf *bp)
241 {
242 struct xfs_mount *mp = bp->b_mount;
243
244 if (!xfs_dquot_buf_verify_crc(mp, bp, false))
245 return;
246 xfs_dquot_buf_verify(mp, bp, false);
247 }
248
249 /*
250 * readahead errors are silent and simply leave the buffer as !done so a real
251 * read will then be run with the xfs_dquot_buf_ops verifier. See
252 * xfs_inode_buf_verify() for why we use EIO and ~XBF_DONE here rather than
253 * reporting the failure.
254 */
255 static void
xfs_dquot_buf_readahead_verify(struct xfs_buf * bp)256 xfs_dquot_buf_readahead_verify(
257 struct xfs_buf *bp)
258 {
259 struct xfs_mount *mp = bp->b_mount;
260
261 if (!xfs_dquot_buf_verify_crc(mp, bp, true) ||
262 xfs_dquot_buf_verify(mp, bp, true) != NULL) {
263 xfs_buf_ioerror(bp, -EIO);
264 bp->b_flags &= ~XBF_DONE;
265 }
266 }
267
268 /*
269 * we don't calculate the CRC here as that is done when the dquot is flushed to
270 * the buffer after the update is done. This ensures that the dquot in the
271 * buffer always has an up-to-date CRC value.
272 */
273 static void
xfs_dquot_buf_write_verify(struct xfs_buf * bp)274 xfs_dquot_buf_write_verify(
275 struct xfs_buf *bp)
276 {
277 struct xfs_mount *mp = bp->b_mount;
278
279 xfs_dquot_buf_verify(mp, bp, false);
280 }
281
282 const struct xfs_buf_ops xfs_dquot_buf_ops = {
283 .name = "xfs_dquot",
284 .magic16 = { cpu_to_be16(XFS_DQUOT_MAGIC),
285 cpu_to_be16(XFS_DQUOT_MAGIC) },
286 .verify_read = xfs_dquot_buf_read_verify,
287 .verify_write = xfs_dquot_buf_write_verify,
288 .verify_struct = xfs_dquot_buf_verify_struct,
289 };
290
291 const struct xfs_buf_ops xfs_dquot_buf_ra_ops = {
292 .name = "xfs_dquot_ra",
293 .magic16 = { cpu_to_be16(XFS_DQUOT_MAGIC),
294 cpu_to_be16(XFS_DQUOT_MAGIC) },
295 .verify_read = xfs_dquot_buf_readahead_verify,
296 .verify_write = xfs_dquot_buf_write_verify,
297 };
298
299 /* Convert an on-disk timer value into an incore timer value. */
300 time64_t
xfs_dquot_from_disk_ts(struct xfs_disk_dquot * ddq,__be32 dtimer)301 xfs_dquot_from_disk_ts(
302 struct xfs_disk_dquot *ddq,
303 __be32 dtimer)
304 {
305 uint32_t t = be32_to_cpu(dtimer);
306
307 if (t != 0 && (ddq->d_type & XFS_DQTYPE_BIGTIME))
308 return xfs_dq_bigtime_to_unix(t);
309
310 return t;
311 }
312
313 /* Convert an incore timer value into an on-disk timer value. */
314 __be32
xfs_dquot_to_disk_ts(struct xfs_dquot * dqp,time64_t timer)315 xfs_dquot_to_disk_ts(
316 struct xfs_dquot *dqp,
317 time64_t timer)
318 {
319 uint32_t t = timer;
320
321 if (timer != 0 && (dqp->q_type & XFS_DQTYPE_BIGTIME))
322 t = xfs_dq_unix_to_bigtime(timer);
323
324 return cpu_to_be32(t);
325 }
326
