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9aede1d8 DC |
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" | |
632b89e8 | 21 | #include "xfs_shared.h" |
9aede1d8 | 22 | #include "xfs_format.h" |
239880ef DC |
23 | #include "xfs_log_format.h" |
24 | #include "xfs_trans_resv.h" | |
9aede1d8 | 25 | #include "xfs_mount.h" |
9aede1d8 DC |
26 | #include "xfs_inode.h" |
27 | #include "xfs_quota.h" | |
239880ef | 28 | #include "xfs_trans.h" |
9aede1d8 DC |
29 | #include "xfs_qm.h" |
30 | #include "xfs_error.h" | |
31 | #include "xfs_cksum.h" | |
32 | #include "xfs_trace.h" | |
33 | ||
34 | int | |
35 | xfs_calc_dquots_per_chunk( | |
9aede1d8 DC |
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 | |
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, | |
7d6a13f0 | 57 | const char *str) |
9aede1d8 DC |
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)) { | |
ce748eaa | 166 | uuid_copy(&d->dd_uuid, &mp->m_sb.sb_meta_uuid); |
9aede1d8 DC |
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 | |
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 | |
6ea94bb5 | 194 | ndquots = xfs_calc_dquots_per_chunk( |
9aede1d8 DC |
195 | XFS_BB_TO_FSB(mp, bp->b_length)); |
196 | ||
197 | for (i = 0; i < ndquots; i++, d++) { | |
198 | if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk), | |
199 | XFS_DQUOT_CRC_OFF)) | |
200 | return false; | |
ce748eaa | 201 | if (!uuid_equal(&d->dd_uuid, &mp->m_sb.sb_meta_uuid)) |
9aede1d8 DC |
202 | return false; |
203 | } | |
204 | return true; | |
205 | } | |
206 | ||
207 | STATIC bool | |
208 | xfs_dquot_buf_verify( | |
209 | struct xfs_mount *mp, | |
7d6a13f0 DC |
210 | struct xfs_buf *bp, |
211 | int warn) | |
9aede1d8 DC |
212 | { |
213 | struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; | |
214 | xfs_dqid_t id = 0; | |
215 | int ndquots; | |
216 | int i; | |
217 | ||
218 | /* | |
219 | * if we are in log recovery, the quota subsystem has not been | |
220 | * initialised so we have no quotainfo structure. In that case, we need | |
221 | * to manually calculate the number of dquots in the buffer. | |
222 | */ | |
223 | if (mp->m_quotainfo) | |
224 | ndquots = mp->m_quotainfo->qi_dqperchunk; | |
225 | else | |
6ea94bb5 | 226 | ndquots = xfs_calc_dquots_per_chunk(bp->b_length); |
9aede1d8 DC |
227 | |
228 | /* | |
229 | * On the first read of the buffer, verify that each dquot is valid. | |
230 | * We don't know what the id of the dquot is supposed to be, just that | |
231 | * they should be increasing monotonically within the buffer. If the | |
232 | * first id is corrupt, then it will fail on the second dquot in the | |
233 | * buffer so corruptions could point to the wrong dquot in this case. | |
234 | */ | |
235 | for (i = 0; i < ndquots; i++) { | |
236 | struct xfs_disk_dquot *ddq; | |
237 | int error; | |
238 | ||
239 | ddq = &d[i].dd_diskdq; | |
240 | ||
241 | if (i == 0) | |
242 | id = be32_to_cpu(ddq->d_id); | |
243 | ||
7d6a13f0 | 244 | error = xfs_dqcheck(mp, ddq, id + i, 0, warn, __func__); |
9aede1d8 DC |
245 | if (error) |
246 | return false; | |
247 | } | |
248 | return true; | |
249 | } | |
250 | ||
251 | static void | |
252 | xfs_dquot_buf_read_verify( | |
253 | struct xfs_buf *bp) | |
254 | { | |
255 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
256 | ||
ce5028cf | 257 | if (!xfs_dquot_buf_verify_crc(mp, bp)) |
2451337d | 258 | xfs_buf_ioerror(bp, -EFSBADCRC); |
7d6a13f0 | 259 | else if (!xfs_dquot_buf_verify(mp, bp, XFS_QMOPT_DOWARN)) |
2451337d | 260 | xfs_buf_ioerror(bp, -EFSCORRUPTED); |
ce5028cf ES |
261 | |
262 | if (bp->b_error) | |
263 | xfs_verifier_error(bp); | |
9aede1d8 DC |
264 | } |
265 | ||
7d6a13f0 DC |
266 | /* |
267 | * readahead errors are silent and simply leave the buffer as !done so a real | |
268 | * read will then be run with the xfs_dquot_buf_ops verifier. See | |
269 | * xfs_inode_buf_verify() for why we use EIO and ~XBF_DONE here rather than | |
270 | * reporting the failure. | |
271 | */ | |
272 | static void | |
273 | xfs_dquot_buf_readahead_verify( | |
274 | struct xfs_buf *bp) | |
275 | { | |
276 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
277 | ||
278 | if (!xfs_dquot_buf_verify_crc(mp, bp) || | |
279 | !xfs_dquot_buf_verify(mp, bp, 0)) { | |
280 | xfs_buf_ioerror(bp, -EIO); | |
281 | bp->b_flags &= ~XBF_DONE; | |
282 | } | |
283 | } | |
284 | ||
9aede1d8 DC |
285 | /* |
286 | * we don't calculate the CRC here as that is done when the dquot is flushed to | |
287 | * the buffer after the update is done. This ensures that the dquot in the | |
288 | * buffer always has an up-to-date CRC value. | |
289 | */ | |
632b89e8 | 290 | static void |
9aede1d8 DC |
291 | xfs_dquot_buf_write_verify( |
292 | struct xfs_buf *bp) | |
293 | { | |
294 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
295 | ||
7d6a13f0 | 296 | if (!xfs_dquot_buf_verify(mp, bp, XFS_QMOPT_DOWARN)) { |
2451337d | 297 | xfs_buf_ioerror(bp, -EFSCORRUPTED); |
ce5028cf | 298 | xfs_verifier_error(bp); |
9aede1d8 DC |
299 | return; |
300 | } | |
301 | } | |
302 | ||
303 | const struct xfs_buf_ops xfs_dquot_buf_ops = { | |
233135b7 | 304 | .name = "xfs_dquot", |
9aede1d8 DC |
305 | .verify_read = xfs_dquot_buf_read_verify, |
306 | .verify_write = xfs_dquot_buf_write_verify, | |
307 | }; | |
308 | ||
7d6a13f0 DC |
309 | const struct xfs_buf_ops xfs_dquot_buf_ra_ops = { |
310 | .name = "xfs_dquot_ra", | |
311 | .verify_read = xfs_dquot_buf_readahead_verify, | |
312 | .verify_write = xfs_dquot_buf_write_verify, | |
313 | }; |