1 /*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * Copyright (c) 2013 Red Hat, Inc.
4 * All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it would be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19 #include "xfs.h"
20 #include "xfs_fs.h"
21 #include "xfs_shared.h"
22 #include "xfs_format.h"
23 #include "xfs_log_format.h"
24 #include "xfs_trans_resv.h"
25 #include "xfs_mount.h"
26 #include "xfs_inode.h"
27 #include "xfs_quota.h"
28 #include "xfs_trans.h"
29 #include "xfs_qm.h"
30 #include "xfs_error.h"
31 #include "xfs_cksum.h"
32 #include "xfs_trace.h"
33
34 int
xfs_calc_dquots_per_chunk(unsigned int nbblks)35 xfs_calc_dquots_per_chunk(
36 unsigned int nbblks) /* basic block units */
37 {
38 unsigned int ndquots;
39
40 ASSERT(nbblks > 0);
41 ndquots = BBTOB(nbblks);
42 do_div(ndquots, sizeof(xfs_dqblk_t));
43
44 return ndquots;
45 }
46
47 /*
48 * Do some primitive error checking on ondisk dquot data structures.
49 */
50 int
xfs_dqcheck(struct xfs_mount * mp,xfs_disk_dquot_t * ddq,xfs_dqid_t id,uint type,uint flags,const char * str)51 xfs_dqcheck(
52 struct xfs_mount *mp,
53 xfs_disk_dquot_t *ddq,
54 xfs_dqid_t id,
55 uint type, /* used only when IO_dorepair is true */
56 uint flags,
57 const char *str)
58 {
59 xfs_dqblk_t *d = (xfs_dqblk_t *)ddq;
60 int errs = 0;
61
62 /*
63 * We can encounter an uninitialized dquot buffer for 2 reasons:
64 * 1. If we crash while deleting the quotainode(s), and those blks got
65 * used for user data. This is because we take the path of regular
66 * file deletion; however, the size field of quotainodes is never
67 * updated, so all the tricks that we play in itruncate_finish
68 * don't quite matter.
69 *
70 * 2. We don't play the quota buffers when there's a quotaoff logitem.
71 * But the allocation will be replayed so we'll end up with an
72 * uninitialized quota block.
73 *
74 * This is all fine; things are still consistent, and we haven't lost
75 * any quota information. Just don't complain about bad dquot blks.
76 */
77 if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC)) {
78 if (flags & XFS_QMOPT_DOWARN)
79 xfs_alert(mp,
80 "%s : XFS dquot ID 0x%x, magic 0x%x != 0x%x",
81 str, id, be16_to_cpu(ddq->d_magic), XFS_DQUOT_MAGIC);
82 errs++;
83 }
84 if (ddq->d_version != XFS_DQUOT_VERSION) {
85 if (flags & XFS_QMOPT_DOWARN)
86 xfs_alert(mp,
87 "%s : XFS dquot ID 0x%x, version 0x%x != 0x%x",
88 str, id, ddq->d_version, XFS_DQUOT_VERSION);
89 errs++;
90 }
91
92 if (ddq->d_flags != XFS_DQ_USER &&
93 ddq->d_flags != XFS_DQ_PROJ &&
94 ddq->d_flags != XFS_DQ_GROUP) {
95 if (flags & XFS_QMOPT_DOWARN)
96 xfs_alert(mp,
97 "%s : XFS dquot ID 0x%x, unknown flags 0x%x",
98 str, id, ddq->d_flags);
99 errs++;
100 }
101
102 if (id != -1 && id != be32_to_cpu(ddq->d_id)) {
103 if (flags & XFS_QMOPT_DOWARN)
104 xfs_alert(mp,
105 "%s : ondisk-dquot 0x%p, ID mismatch: "
106 "0x%x expected, found id 0x%x",
107 str, ddq, id, be32_to_cpu(ddq->d_id));
108 errs++;
109 }
110
111 if (!errs && ddq->d_id) {
112 if (ddq->d_blk_softlimit &&
113 be64_to_cpu(ddq->d_bcount) >
114 be64_to_cpu(ddq->d_blk_softlimit)) {
115 if (!ddq->d_btimer) {
116 if (flags & XFS_QMOPT_DOWARN)
117 xfs_alert(mp,
118 "%s : Dquot ID 0x%x (0x%p) BLK TIMER NOT STARTED",
119 str, (int)be32_to_cpu(ddq->d_id), ddq);
120 errs++;
121 }
122 }
123 if (ddq->d_ino_softlimit &&
124 be64_to_cpu(ddq->d_icount) >
125 be64_to_cpu(ddq->d_ino_softlimit)) {
126 if (!ddq->d_itimer) {
127 if (flags & XFS_QMOPT_DOWARN)
128 xfs_alert(mp,
129 "%s : Dquot ID 0x%x (0x%p) INODE TIMER NOT STARTED",
130 str, (int)be32_to_cpu(ddq->d_id), ddq);
131 errs++;
132 }
133 }
134 if (ddq->d_rtb_softlimit &&
135 be64_to_cpu(ddq->d_rtbcount) >
136 be64_to_cpu(ddq->d_rtb_softlimit)) {
137 if (!ddq->d_rtbtimer) {
138 if (flags & XFS_QMOPT_DOWARN)
139 xfs_alert(mp,
140 "%s : Dquot ID 0x%x (0x%p) RTBLK TIMER NOT STARTED",
141 str, (int)be32_to_cpu(ddq->d_id), ddq);
142 errs++;
143 }
144 }
145 }
146
147 if (!errs || !(flags & XFS_QMOPT_DQREPAIR))
148 return errs;
149
150 if (flags & XFS_QMOPT_DOWARN)
151 xfs_notice(mp, "Re-initializing dquot ID 0x%x", id);
152
153 /*
154 * Typically, a repair is only requested by quotacheck.
155 */
156 ASSERT(id != -1);
157 ASSERT(flags & XFS_QMOPT_DQREPAIR);
158 memset(d, 0, sizeof(xfs_dqblk_t));
159
160 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
161 d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
162 d->dd_diskdq.d_flags = type;
163 d->dd_diskdq.d_id = cpu_to_be32(id);
164
165 if (xfs_sb_version_hascrc(&mp->m_sb)) {
166 uuid_copy(&d->dd_uuid, &mp->m_sb.sb_meta_uuid);
167 xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk),
168 XFS_DQUOT_CRC_OFF);
169 }
170
171 return errs;
172 }
173
174 STATIC bool
xfs_dquot_buf_verify_crc(struct xfs_mount * mp,struct xfs_buf * bp)175 xfs_dquot_buf_verify_crc(
176 struct xfs_mount *mp,
177 struct xfs_buf *bp)
178 {
179 struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr;
180 int ndquots;
181 int i;
182
183 if (!xfs_sb_version_hascrc(&mp->m_sb))
184 return true;
185
186 /*
187 * if we are in log recovery, the quota subsystem has not been
188 * initialised so we have no quotainfo structure. In that case, we need
189 * to manually calculate the number of dquots in the buffer.
190 */
191 if (mp->m_quotainfo)
192 ndquots = mp->m_quotainfo->qi_dqperchunk;
193 else
194 ndquots = xfs_calc_dquots_per_chunk(bp->b_length);
195
196 for (i = 0; i < ndquots; i++, d++) {
197 if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk),
198 XFS_DQUOT_CRC_OFF))
199 return false;
200 if (!uuid_equal(&d->dd_uuid, &mp->m_sb.sb_meta_uuid))
201 return false;
202 }
203 return true;
204 }
205
206 STATIC bool
xfs_dquot_buf_verify(struct xfs_mount * mp,struct xfs_buf * bp,int warn)207 xfs_dquot_buf_verify(
208 struct xfs_mount *mp,
209 struct xfs_buf *bp,
210 int warn)
211 {
212 struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr;
213 xfs_dqid_t id = 0;
214 int ndquots;
215 int i;
216
217 /*
218 * if we are in log recovery, the quota subsystem has not been
219 * initialised so we have no quotainfo structure. In that case, we need
220 * to manually calculate the number of dquots in the buffer.
221 */
222 if (mp->m_quotainfo)
223 ndquots = mp->m_quotainfo->qi_dqperchunk;
224 else
225 ndquots = xfs_calc_dquots_per_chunk(bp->b_length);
226
227 /*
228 * On the first read of the buffer, verify that each dquot is valid.
229 * We don't know what the id of the dquot is supposed to be, just that
230 * they should be increasing monotonically within the buffer. If the
231 * first id is corrupt, then it will fail on the second dquot in the
232 * buffer so corruptions could point to the wrong dquot in this case.
233 */
234 for (i = 0; i < ndquots; i++) {
235 struct xfs_disk_dquot *ddq;
236 int error;
237
238 ddq = &d[i].dd_diskdq;
239
240 if (i == 0)
241 id = be32_to_cpu(ddq->d_id);
242
243 error = xfs_dqcheck(mp, ddq, id + i, 0, warn, __func__);
244 if (error)
245 return false;
246 }
247 return true;
248 }
249
250 static void
xfs_dquot_buf_read_verify(struct xfs_buf * bp)251 xfs_dquot_buf_read_verify(
252 struct xfs_buf *bp)
253 {
254 struct xfs_mount *mp = bp->b_target->bt_mount;
255
256 if (!xfs_dquot_buf_verify_crc(mp, bp))
257 xfs_buf_ioerror(bp, -EFSBADCRC);
258 else if (!xfs_dquot_buf_verify(mp, bp, XFS_QMOPT_DOWARN))
259 xfs_buf_ioerror(bp, -EFSCORRUPTED);
260
261 if (bp->b_error)
262 xfs_verifier_error(bp);
263 }
264
265 /*
266 * readahead errors are silent and simply leave the buffer as !done so a real
267 * read will then be run with the xfs_dquot_buf_ops verifier. See
268 * xfs_inode_buf_verify() for why we use EIO and ~XBF_DONE here rather than
269 * reporting the failure.
270 */
271 static void
xfs_dquot_buf_readahead_verify(struct xfs_buf * bp)272 xfs_dquot_buf_readahead_verify(
273 struct xfs_buf *bp)
274 {
275 struct xfs_mount *mp = bp->b_target->bt_mount;
276
277 if (!xfs_dquot_buf_verify_crc(mp, bp) ||
278 !xfs_dquot_buf_verify(mp, bp, 0)) {
279 xfs_buf_ioerror(bp, -EIO);
280 bp->b_flags &= ~XBF_DONE;
281 }
282 }
283
284 /*
285 * we don't calculate the CRC here as that is done when the dquot is flushed to
286 * the buffer after the update is done. This ensures that the dquot in the
287 * buffer always has an up-to-date CRC value.
288 */
289 static void
xfs_dquot_buf_write_verify(struct xfs_buf * bp)290 xfs_dquot_buf_write_verify(
291 struct xfs_buf *bp)
292 {
293 struct xfs_mount *mp = bp->b_target->bt_mount;
294
295 if (!xfs_dquot_buf_verify(mp, bp, XFS_QMOPT_DOWARN)) {
296 xfs_buf_ioerror(bp, -EFSCORRUPTED);
297 xfs_verifier_error(bp);
298 return;
299 }
300 }
301
302 const struct xfs_buf_ops xfs_dquot_buf_ops = {
303 .name = "xfs_dquot",
304 .verify_read = xfs_dquot_buf_read_verify,
305 .verify_write = xfs_dquot_buf_write_verify,
306 };
307
308 const struct xfs_buf_ops xfs_dquot_buf_ra_ops = {
309 .name = "xfs_dquot_ra",
310 .verify_read = xfs_dquot_buf_readahead_verify,
311 .verify_write = xfs_dquot_buf_write_verify,
312 };
313