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32390f05 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 | ||
ff105f75 DC |
21 | /* |
22 | * XXX: kernel implementation causes ndquots calc to go real | |
23 | * bad. Just leaving the existing userspace calc here right now. | |
24 | */ | |
32390f05 DC |
25 | int |
26 | xfs_calc_dquots_per_chunk( | |
32390f05 DC |
27 | unsigned int nbblks) /* basic block units */ |
28 | { | |
ff105f75 | 29 | |
32390f05 | 30 | ASSERT(nbblks > 0); |
839dac7f | 31 | return BBTOB(nbblks) / sizeof(xfs_dqblk_t); |
ff105f75 DC |
32 | |
33 | #if 0 /* kernel code that goes wrong in userspace! */ | |
34 | unsigned int ndquots; | |
35 | ||
36 | ASSERT(nbblks > 0); | |
37 | ndquots = BBTOB(nbblks); | |
38 | do_div(ndquots, sizeof(xfs_dqblk_t)); | |
39 | ||
40 | return ndquots; | |
41 | #endif | |
32390f05 DC |
42 | } |
43 | ||
44 | /* | |
45 | * Do some primitive error checking on ondisk dquot data structures. | |
46 | */ | |
47 | int | |
48 | xfs_dqcheck( | |
49 | struct xfs_mount *mp, | |
50 | xfs_disk_dquot_t *ddq, | |
51 | xfs_dqid_t id, | |
52 | uint type, /* used only when IO_dorepair is true */ | |
53 | uint flags, | |
54 | char *str) | |
55 | { | |
56 | xfs_dqblk_t *d = (xfs_dqblk_t *)ddq; | |
57 | int errs = 0; | |
58 | ||
59 | /* | |
60 | * We can encounter an uninitialized dquot buffer for 2 reasons: | |
61 | * 1. If we crash while deleting the quotainode(s), and those blks got | |
62 | * used for user data. This is because we take the path of regular | |
63 | * file deletion; however, the size field of quotainodes is never | |
64 | * updated, so all the tricks that we play in itruncate_finish | |
65 | * don't quite matter. | |
66 | * | |
67 | * 2. We don't play the quota buffers when there's a quotaoff logitem. | |
68 | * But the allocation will be replayed so we'll end up with an | |
69 | * uninitialized quota block. | |
70 | * | |
71 | * This is all fine; things are still consistent, and we haven't lost | |
72 | * any quota information. Just don't complain about bad dquot blks. | |
73 | */ | |
74 | if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC)) { | |
75 | if (flags & XFS_QMOPT_DOWARN) | |
76 | xfs_alert(mp, | |
77 | "%s : XFS dquot ID 0x%x, magic 0x%x != 0x%x", | |
78 | str, id, be16_to_cpu(ddq->d_magic), XFS_DQUOT_MAGIC); | |
79 | errs++; | |
80 | } | |
81 | if (ddq->d_version != XFS_DQUOT_VERSION) { | |
82 | if (flags & XFS_QMOPT_DOWARN) | |
83 | xfs_alert(mp, | |
84 | "%s : XFS dquot ID 0x%x, version 0x%x != 0x%x", | |
85 | str, id, ddq->d_version, XFS_DQUOT_VERSION); | |
86 | errs++; | |
87 | } | |
88 | ||
89 | if (ddq->d_flags != XFS_DQ_USER && | |
90 | ddq->d_flags != XFS_DQ_PROJ && | |
91 | ddq->d_flags != XFS_DQ_GROUP) { | |
92 | if (flags & XFS_QMOPT_DOWARN) | |
93 | xfs_alert(mp, | |
94 | "%s : XFS dquot ID 0x%x, unknown flags 0x%x", | |
95 | str, id, ddq->d_flags); | |
96 | errs++; | |
97 | } | |
98 | ||
99 | if (id != -1 && id != be32_to_cpu(ddq->d_id)) { | |
100 | if (flags & XFS_QMOPT_DOWARN) | |
101 | xfs_alert(mp, | |
102 | "%s : ondisk-dquot 0x%p, ID mismatch: " | |
103 | "0x%x expected, found id 0x%x", | |
104 | str, ddq, id, be32_to_cpu(ddq->d_id)); | |
105 | errs++; | |
106 | } | |
107 | ||
108 | if (!errs && ddq->d_id) { | |
109 | if (ddq->d_blk_softlimit && | |
110 | be64_to_cpu(ddq->d_bcount) > | |
111 | be64_to_cpu(ddq->d_blk_softlimit)) { | |
112 | if (!ddq->d_btimer) { | |
113 | if (flags & XFS_QMOPT_DOWARN) | |
114 | xfs_alert(mp, | |
115 | "%s : Dquot ID 0x%x (0x%p) BLK TIMER NOT STARTED", | |
116 | str, (int)be32_to_cpu(ddq->d_id), ddq); | |
117 | errs++; | |
118 | } | |
119 | } | |
120 | if (ddq->d_ino_softlimit && | |
121 | be64_to_cpu(ddq->d_icount) > | |
122 | be64_to_cpu(ddq->d_ino_softlimit)) { | |
123 | if (!ddq->d_itimer) { | |
124 | if (flags & XFS_QMOPT_DOWARN) | |
125 | xfs_alert(mp, | |
126 | "%s : Dquot ID 0x%x (0x%p) INODE TIMER NOT STARTED", | |
127 | str, (int)be32_to_cpu(ddq->d_id), ddq); | |
128 | errs++; | |
129 | } | |
130 | } | |
131 | if (ddq->d_rtb_softlimit && | |
132 | be64_to_cpu(ddq->d_rtbcount) > | |
133 | be64_to_cpu(ddq->d_rtb_softlimit)) { | |
134 | if (!ddq->d_rtbtimer) { | |
135 | if (flags & XFS_QMOPT_DOWARN) | |
136 | xfs_alert(mp, | |
137 | "%s : Dquot ID 0x%x (0x%p) RTBLK TIMER NOT STARTED", | |
138 | str, (int)be32_to_cpu(ddq->d_id), ddq); | |
139 | errs++; | |
140 | } | |
141 | } | |
142 | } | |
143 | ||
144 | if (!errs || !(flags & XFS_QMOPT_DQREPAIR)) | |
145 | return errs; | |
146 | ||
147 | if (flags & XFS_QMOPT_DOWARN) | |
148 | xfs_notice(mp, "Re-initializing dquot ID 0x%x", id); | |
149 | ||
150 | /* | |
151 | * Typically, a repair is only requested by quotacheck. | |
152 | */ | |
153 | ASSERT(id != -1); | |
154 | ASSERT(flags & XFS_QMOPT_DQREPAIR); | |
155 | memset(d, 0, sizeof(xfs_dqblk_t)); | |
156 | ||
157 | d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC); | |
158 | d->dd_diskdq.d_version = XFS_DQUOT_VERSION; | |
159 | d->dd_diskdq.d_flags = type; | |
160 | d->dd_diskdq.d_id = cpu_to_be32(id); | |
161 | ||
162 | if (xfs_sb_version_hascrc(&mp->m_sb)) { | |
163 | uuid_copy(&d->dd_uuid, &mp->m_sb.sb_uuid); | |
164 | xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk), | |
165 | XFS_DQUOT_CRC_OFF); | |
166 | } | |
167 | ||
168 | return errs; | |
169 | } | |
170 | ||
171 | STATIC bool | |
172 | xfs_dquot_buf_verify_crc( | |
173 | struct xfs_mount *mp, | |
174 | struct xfs_buf *bp) | |
175 | { | |
176 | struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; | |
177 | int ndquots; | |
178 | int i; | |
179 | ||
180 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
181 | return true; | |
182 | ||
183 | /* | |
184 | * if we are in log recovery, the quota subsystem has not been | |
185 | * initialised so we have no quotainfo structure. In that case, we need | |
186 | * to manually calculate the number of dquots in the buffer. | |
187 | */ | |
188 | if (mp->m_quotainfo) | |
189 | ndquots = mp->m_quotainfo->qi_dqperchunk; | |
190 | else | |
ff105f75 DC |
191 | ndquots = xfs_calc_dquots_per_chunk(bp->b_length); |
192 | // XFS_BB_TO_FSB(mp, bp->b_length)); | |
32390f05 DC |
193 | |
194 | for (i = 0; i < ndquots; i++, d++) { | |
195 | if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk), | |
196 | XFS_DQUOT_CRC_OFF)) | |
197 | return false; | |
198 | if (!uuid_equal(&d->dd_uuid, &mp->m_sb.sb_uuid)) | |
199 | return false; | |
200 | } | |
201 | return true; | |
202 | } | |
203 | ||
204 | STATIC bool | |
205 | xfs_dquot_buf_verify( | |
206 | struct xfs_mount *mp, | |
207 | struct xfs_buf *bp) | |
208 | { | |
209 | struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; | |
210 | xfs_dqid_t id = 0; | |
211 | int ndquots; | |
212 | int i; | |
213 | ||
214 | /* | |
215 | * if we are in log recovery, the quota subsystem has not been | |
216 | * initialised so we have no quotainfo structure. In that case, we need | |
217 | * to manually calculate the number of dquots in the buffer. | |
218 | */ | |
219 | if (mp->m_quotainfo) | |
220 | ndquots = mp->m_quotainfo->qi_dqperchunk; | |
221 | else | |
ff105f75 | 222 | ndquots = xfs_calc_dquots_per_chunk(bp->b_length); |
32390f05 DC |
223 | |
224 | /* | |
225 | * On the first read of the buffer, verify that each dquot is valid. | |
226 | * We don't know what the id of the dquot is supposed to be, just that | |
227 | * they should be increasing monotonically within the buffer. If the | |
228 | * first id is corrupt, then it will fail on the second dquot in the | |
229 | * buffer so corruptions could point to the wrong dquot in this case. | |
230 | */ | |
231 | for (i = 0; i < ndquots; i++) { | |
232 | struct xfs_disk_dquot *ddq; | |
233 | int error; | |
234 | ||
235 | ddq = &d[i].dd_diskdq; | |
236 | ||
237 | if (i == 0) | |
238 | id = be32_to_cpu(ddq->d_id); | |
239 | ||
240 | error = xfs_dqcheck(mp, ddq, id + i, 0, XFS_QMOPT_DOWARN, | |
241 | "xfs_dquot_buf_verify"); | |
242 | if (error) | |
243 | return false; | |
244 | } | |
245 | return true; | |
246 | } | |
247 | ||
248 | static void | |
249 | xfs_dquot_buf_read_verify( | |
250 | struct xfs_buf *bp) | |
251 | { | |
252 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
253 | ||
45922933 | 254 | if (!xfs_dquot_buf_verify_crc(mp, bp)) |
12b53197 | 255 | xfs_buf_ioerror(bp, -EFSBADCRC); |
45922933 | 256 | else if (!xfs_dquot_buf_verify(mp, bp)) |
12b53197 | 257 | xfs_buf_ioerror(bp, -EFSCORRUPTED); |
45922933 DC |
258 | |
259 | if (bp->b_error) | |
260 | xfs_verifier_error(bp); | |
32390f05 DC |
261 | } |
262 | ||
263 | /* | |
264 | * we don't calculate the CRC here as that is done when the dquot is flushed to | |
265 | * the buffer after the update is done. This ensures that the dquot in the | |
266 | * buffer always has an up-to-date CRC value. | |
267 | */ | |
ff105f75 | 268 | static void |
32390f05 DC |
269 | xfs_dquot_buf_write_verify( |
270 | struct xfs_buf *bp) | |
271 | { | |
272 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
273 | ||
274 | if (!xfs_dquot_buf_verify(mp, bp)) { | |
12b53197 | 275 | xfs_buf_ioerror(bp, -EFSCORRUPTED); |
45922933 | 276 | xfs_verifier_error(bp); |
32390f05 DC |
277 | return; |
278 | } | |
279 | } | |
280 | ||
281 | const struct xfs_buf_ops xfs_dquot_buf_ops = { | |
282 | .verify_read = xfs_dquot_buf_read_verify, | |
283 | .verify_write = xfs_dquot_buf_write_verify, | |
284 | }; | |
285 |