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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 DC |
25 | #include "xfs_sb.h" |
26 | #include "xfs_ag.h" | |
27 | #include "xfs_mount.h" | |
9aede1d8 DC |
28 | #include "xfs_inode.h" |
29 | #include "xfs_quota.h" | |
239880ef | 30 | #include "xfs_trans.h" |
9aede1d8 DC |
31 | #include "xfs_qm.h" |
32 | #include "xfs_error.h" | |
33 | #include "xfs_cksum.h" | |
34 | #include "xfs_trace.h" | |
35 | ||
36 | int | |
37 | xfs_calc_dquots_per_chunk( | |
38 | struct xfs_mount *mp, | |
39 | unsigned int nbblks) /* basic block units */ | |
40 | { | |
41 | unsigned int ndquots; | |
42 | ||
43 | ASSERT(nbblks > 0); | |
44 | ndquots = BBTOB(nbblks); | |
45 | do_div(ndquots, sizeof(xfs_dqblk_t)); | |
46 | ||
47 | return ndquots; | |
48 | } | |
49 | ||
50 | /* | |
51 | * Do some primitive error checking on ondisk dquot data structures. | |
52 | */ | |
53 | int | |
54 | xfs_dqcheck( | |
55 | struct xfs_mount *mp, | |
56 | xfs_disk_dquot_t *ddq, | |
57 | xfs_dqid_t id, | |
58 | uint type, /* used only when IO_dorepair is true */ | |
59 | uint flags, | |
60 | char *str) | |
61 | { | |
62 | xfs_dqblk_t *d = (xfs_dqblk_t *)ddq; | |
63 | int errs = 0; | |
64 | ||
65 | /* | |
66 | * We can encounter an uninitialized dquot buffer for 2 reasons: | |
67 | * 1. If we crash while deleting the quotainode(s), and those blks got | |
68 | * used for user data. This is because we take the path of regular | |
69 | * file deletion; however, the size field of quotainodes is never | |
70 | * updated, so all the tricks that we play in itruncate_finish | |
71 | * don't quite matter. | |
72 | * | |
73 | * 2. We don't play the quota buffers when there's a quotaoff logitem. | |
74 | * But the allocation will be replayed so we'll end up with an | |
75 | * uninitialized quota block. | |
76 | * | |
77 | * This is all fine; things are still consistent, and we haven't lost | |
78 | * any quota information. Just don't complain about bad dquot blks. | |
79 | */ | |
80 | if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC)) { | |
81 | if (flags & XFS_QMOPT_DOWARN) | |
82 | xfs_alert(mp, | |
83 | "%s : XFS dquot ID 0x%x, magic 0x%x != 0x%x", | |
84 | str, id, be16_to_cpu(ddq->d_magic), XFS_DQUOT_MAGIC); | |
85 | errs++; | |
86 | } | |
87 | if (ddq->d_version != XFS_DQUOT_VERSION) { | |
88 | if (flags & XFS_QMOPT_DOWARN) | |
89 | xfs_alert(mp, | |
90 | "%s : XFS dquot ID 0x%x, version 0x%x != 0x%x", | |
91 | str, id, ddq->d_version, XFS_DQUOT_VERSION); | |
92 | errs++; | |
93 | } | |
94 | ||
95 | if (ddq->d_flags != XFS_DQ_USER && | |
96 | ddq->d_flags != XFS_DQ_PROJ && | |
97 | ddq->d_flags != XFS_DQ_GROUP) { | |
98 | if (flags & XFS_QMOPT_DOWARN) | |
99 | xfs_alert(mp, | |
100 | "%s : XFS dquot ID 0x%x, unknown flags 0x%x", | |
101 | str, id, ddq->d_flags); | |
102 | errs++; | |
103 | } | |
104 | ||
105 | if (id != -1 && id != be32_to_cpu(ddq->d_id)) { | |
106 | if (flags & XFS_QMOPT_DOWARN) | |
107 | xfs_alert(mp, | |
108 | "%s : ondisk-dquot 0x%p, ID mismatch: " | |
109 | "0x%x expected, found id 0x%x", | |
110 | str, ddq, id, be32_to_cpu(ddq->d_id)); | |
111 | errs++; | |
112 | } | |
113 | ||
114 | if (!errs && ddq->d_id) { | |
115 | if (ddq->d_blk_softlimit && | |
116 | be64_to_cpu(ddq->d_bcount) > | |
117 | be64_to_cpu(ddq->d_blk_softlimit)) { | |
118 | if (!ddq->d_btimer) { | |
119 | if (flags & XFS_QMOPT_DOWARN) | |
120 | xfs_alert(mp, | |
121 | "%s : Dquot ID 0x%x (0x%p) BLK TIMER NOT STARTED", | |
122 | str, (int)be32_to_cpu(ddq->d_id), ddq); | |
123 | errs++; | |
124 | } | |
125 | } | |
126 | if (ddq->d_ino_softlimit && | |
127 | be64_to_cpu(ddq->d_icount) > | |
128 | be64_to_cpu(ddq->d_ino_softlimit)) { | |
129 | if (!ddq->d_itimer) { | |
130 | if (flags & XFS_QMOPT_DOWARN) | |
131 | xfs_alert(mp, | |
132 | "%s : Dquot ID 0x%x (0x%p) INODE TIMER NOT STARTED", | |
133 | str, (int)be32_to_cpu(ddq->d_id), ddq); | |
134 | errs++; | |
135 | } | |
136 | } | |
137 | if (ddq->d_rtb_softlimit && | |
138 | be64_to_cpu(ddq->d_rtbcount) > | |
139 | be64_to_cpu(ddq->d_rtb_softlimit)) { | |
140 | if (!ddq->d_rtbtimer) { | |
141 | if (flags & XFS_QMOPT_DOWARN) | |
142 | xfs_alert(mp, | |
143 | "%s : Dquot ID 0x%x (0x%p) RTBLK TIMER NOT STARTED", | |
144 | str, (int)be32_to_cpu(ddq->d_id), ddq); | |
145 | errs++; | |
146 | } | |
147 | } | |
148 | } | |
149 | ||
150 | if (!errs || !(flags & XFS_QMOPT_DQREPAIR)) | |
151 | return errs; | |
152 | ||
153 | if (flags & XFS_QMOPT_DOWARN) | |
154 | xfs_notice(mp, "Re-initializing dquot ID 0x%x", id); | |
155 | ||
156 | /* | |
157 | * Typically, a repair is only requested by quotacheck. | |
158 | */ | |
159 | ASSERT(id != -1); | |
160 | ASSERT(flags & XFS_QMOPT_DQREPAIR); | |
161 | memset(d, 0, sizeof(xfs_dqblk_t)); | |
162 | ||
163 | d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC); | |
164 | d->dd_diskdq.d_version = XFS_DQUOT_VERSION; | |
165 | d->dd_diskdq.d_flags = type; | |
166 | d->dd_diskdq.d_id = cpu_to_be32(id); | |
167 | ||
168 | if (xfs_sb_version_hascrc(&mp->m_sb)) { | |
169 | uuid_copy(&d->dd_uuid, &mp->m_sb.sb_uuid); | |
170 | xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk), | |
171 | XFS_DQUOT_CRC_OFF); | |
172 | } | |
173 | ||
174 | return errs; | |
175 | } | |
176 | ||
177 | STATIC bool | |
178 | xfs_dquot_buf_verify_crc( | |
179 | struct xfs_mount *mp, | |
180 | struct xfs_buf *bp) | |
181 | { | |
182 | struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; | |
183 | int ndquots; | |
184 | int i; | |
185 | ||
186 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
187 | return true; | |
188 | ||
189 | /* | |
190 | * if we are in log recovery, the quota subsystem has not been | |
191 | * initialised so we have no quotainfo structure. In that case, we need | |
192 | * to manually calculate the number of dquots in the buffer. | |
193 | */ | |
194 | if (mp->m_quotainfo) | |
195 | ndquots = mp->m_quotainfo->qi_dqperchunk; | |
196 | else | |
197 | ndquots = xfs_calc_dquots_per_chunk(mp, | |
198 | XFS_BB_TO_FSB(mp, bp->b_length)); | |
199 | ||
200 | for (i = 0; i < ndquots; i++, d++) { | |
201 | if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk), | |
202 | XFS_DQUOT_CRC_OFF)) | |
203 | return false; | |
204 | if (!uuid_equal(&d->dd_uuid, &mp->m_sb.sb_uuid)) | |
205 | return false; | |
206 | } | |
207 | return true; | |
208 | } | |
209 | ||
210 | STATIC bool | |
211 | xfs_dquot_buf_verify( | |
212 | struct xfs_mount *mp, | |
213 | struct xfs_buf *bp) | |
214 | { | |
215 | struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; | |
216 | xfs_dqid_t id = 0; | |
217 | int ndquots; | |
218 | int i; | |
219 | ||
220 | /* | |
221 | * if we are in log recovery, the quota subsystem has not been | |
222 | * initialised so we have no quotainfo structure. In that case, we need | |
223 | * to manually calculate the number of dquots in the buffer. | |
224 | */ | |
225 | if (mp->m_quotainfo) | |
226 | ndquots = mp->m_quotainfo->qi_dqperchunk; | |
227 | else | |
228 | ndquots = xfs_calc_dquots_per_chunk(mp, bp->b_length); | |
229 | ||
230 | /* | |
231 | * On the first read of the buffer, verify that each dquot is valid. | |
232 | * We don't know what the id of the dquot is supposed to be, just that | |
233 | * they should be increasing monotonically within the buffer. If the | |
234 | * first id is corrupt, then it will fail on the second dquot in the | |
235 | * buffer so corruptions could point to the wrong dquot in this case. | |
236 | */ | |
237 | for (i = 0; i < ndquots; i++) { | |
238 | struct xfs_disk_dquot *ddq; | |
239 | int error; | |
240 | ||
241 | ddq = &d[i].dd_diskdq; | |
242 | ||
243 | if (i == 0) | |
244 | id = be32_to_cpu(ddq->d_id); | |
245 | ||
246 | error = xfs_dqcheck(mp, ddq, id + i, 0, XFS_QMOPT_DOWARN, | |
247 | "xfs_dquot_buf_verify"); | |
248 | if (error) | |
249 | return false; | |
250 | } | |
251 | return true; | |
252 | } | |
253 | ||
254 | static void | |
255 | xfs_dquot_buf_read_verify( | |
256 | struct xfs_buf *bp) | |
257 | { | |
258 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
259 | ||
260 | if (!xfs_dquot_buf_verify_crc(mp, bp) || !xfs_dquot_buf_verify(mp, bp)) { | |
261 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); | |
262 | xfs_buf_ioerror(bp, EFSCORRUPTED); | |
263 | } | |
264 | } | |
265 | ||
266 | /* | |
267 | * we don't calculate the CRC here as that is done when the dquot is flushed to | |
268 | * the buffer after the update is done. This ensures that the dquot in the | |
269 | * buffer always has an up-to-date CRC value. | |
270 | */ | |
632b89e8 | 271 | static void |
9aede1d8 DC |
272 | xfs_dquot_buf_write_verify( |
273 | struct xfs_buf *bp) | |
274 | { | |
275 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
276 | ||
277 | if (!xfs_dquot_buf_verify(mp, bp)) { | |
278 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); | |
279 | xfs_buf_ioerror(bp, EFSCORRUPTED); | |
280 | return; | |
281 | } | |
282 | } | |
283 | ||
284 | const struct xfs_buf_ops xfs_dquot_buf_ops = { | |
285 | .verify_read = xfs_dquot_buf_read_verify, | |
286 | .verify_write = xfs_dquot_buf_write_verify, | |
287 | }; | |
288 |