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2bd0ea18 | 1 | /* |
5e656dbb | 2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
da23017d | 3 | * All Rights Reserved. |
2bd0ea18 | 4 | * |
da23017d NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
2bd0ea18 NS |
7 | * published by the Free Software Foundation. |
8 | * | |
da23017d NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
2bd0ea18 | 13 | * |
da23017d NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
2bd0ea18 | 17 | */ |
2bd0ea18 NS |
18 | #include <xfs.h> |
19 | ||
4896e6c8 DC |
20 | /* |
21 | * Physical superblock buffer manipulations. Shared with libxfs in userspace. | |
22 | */ | |
23 | ||
56b2de80 DC |
24 | /* |
25 | * Reference counting access wrappers to the perag structures. | |
26 | * Because we never free per-ag structures, the only thing we | |
27 | * have to protect against changes is the tree structure itself. | |
28 | */ | |
29 | struct xfs_perag * | |
4896e6c8 DC |
30 | xfs_perag_get( |
31 | struct xfs_mount *mp, | |
32 | xfs_agnumber_t agno) | |
a33a9e62 | 33 | { |
56b2de80 DC |
34 | struct xfs_perag *pag; |
35 | int ref = 0; | |
36 | ||
37 | rcu_read_lock(); | |
38 | pag = radix_tree_lookup(&mp->m_perag_tree, agno); | |
39 | if (pag) { | |
40 | ASSERT(atomic_read(&pag->pag_ref) >= 0); | |
41 | ref = atomic_inc_return(&pag->pag_ref); | |
a33a9e62 | 42 | } |
56b2de80 | 43 | rcu_read_unlock(); |
a2ceac1f | 44 | trace_xfs_perag_get(mp, agno, ref, _RET_IP_); |
56b2de80 DC |
45 | return pag; |
46 | } | |
a33a9e62 | 47 | |
4896e6c8 DC |
48 | /* |
49 | * search from @first to find the next perag with the given tag set. | |
50 | */ | |
51 | struct xfs_perag * | |
52 | xfs_perag_get_tag( | |
53 | struct xfs_mount *mp, | |
54 | xfs_agnumber_t first, | |
55 | int tag) | |
56 | { | |
57 | struct xfs_perag *pag; | |
58 | int found; | |
59 | int ref; | |
60 | ||
61 | rcu_read_lock(); | |
62 | found = radix_tree_gang_lookup_tag(&mp->m_perag_tree, | |
63 | (void **)&pag, first, 1, tag); | |
64 | if (found <= 0) { | |
65 | rcu_read_unlock(); | |
66 | return NULL; | |
67 | } | |
68 | ref = atomic_inc_return(&pag->pag_ref); | |
69 | rcu_read_unlock(); | |
70 | trace_xfs_perag_get_tag(mp, pag->pag_agno, ref, _RET_IP_); | |
71 | return pag; | |
72 | } | |
73 | ||
56b2de80 | 74 | void |
4896e6c8 DC |
75 | xfs_perag_put( |
76 | struct xfs_perag *pag) | |
56b2de80 DC |
77 | { |
78 | int ref; | |
a33a9e62 | 79 | |
56b2de80 DC |
80 | ASSERT(atomic_read(&pag->pag_ref) > 0); |
81 | ref = atomic_dec_return(&pag->pag_ref); | |
82 | trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_); | |
a33a9e62 | 83 | } |
cdded3d8 | 84 | |
a2ceac1f DC |
85 | /* |
86 | * Check the validity of the SB found. | |
87 | */ | |
88 | STATIC int | |
89 | xfs_mount_validate_sb( | |
90 | xfs_mount_t *mp, | |
91 | xfs_sb_t *sbp, | |
5629f836 DC |
92 | bool check_inprogress, |
93 | bool check_version) | |
a2ceac1f | 94 | { |
a2ceac1f DC |
95 | if (sbp->sb_magicnum != XFS_SB_MAGIC) { |
96 | xfs_warn(mp, "bad magic number"); | |
12b53197 | 97 | return -EWRONGFS; |
a2ceac1f DC |
98 | } |
99 | ||
5565d79a | 100 | |
a2ceac1f DC |
101 | if (!xfs_sb_good_version(sbp)) { |
102 | xfs_warn(mp, "bad version"); | |
12b53197 | 103 | return -EWRONGFS; |
a2ceac1f DC |
104 | } |
105 | ||
5565d79a | 106 | /* |
6567f1f9 | 107 | * Version 5 superblock feature mask validation. Reject combinations the |
4896e6c8 DC |
108 | * kernel cannot support up front before checking anything else. For |
109 | * write validation, we don't need to check feature masks. | |
5565d79a | 110 | */ |
5629f836 | 111 | if (check_version && XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) { |
6567f1f9 DC |
112 | if (xfs_sb_has_compat_feature(sbp, |
113 | XFS_SB_FEAT_COMPAT_UNKNOWN)) { | |
114 | xfs_warn(mp, | |
115 | "Superblock has unknown compatible features (0x%x) enabled.\n" | |
ff105f75 | 116 | "Using a more recent kernel is recommended.", |
6567f1f9 DC |
117 | (sbp->sb_features_compat & |
118 | XFS_SB_FEAT_COMPAT_UNKNOWN)); | |
119 | } | |
120 | ||
121 | if (xfs_sb_has_ro_compat_feature(sbp, | |
122 | XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { | |
ff105f75 DC |
123 | xfs_alert(mp, |
124 | "Superblock has unknown read-only compatible features (0x%x) enabled.", | |
6567f1f9 DC |
125 | (sbp->sb_features_ro_compat & |
126 | XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); | |
ff105f75 DC |
127 | if (!(mp->m_flags & XFS_MOUNT_RDONLY)) { |
128 | xfs_warn(mp, | |
129 | "Attempted to mount read-only compatible filesystem read-write.\n" | |
130 | "Filesystem can only be safely mounted read only."); | |
12b53197 | 131 | return -EINVAL; |
ff105f75 | 132 | } |
6567f1f9 DC |
133 | } |
134 | if (xfs_sb_has_incompat_feature(sbp, | |
135 | XFS_SB_FEAT_INCOMPAT_UNKNOWN)) { | |
136 | xfs_warn(mp, | |
137 | "Superblock has unknown incompatible features (0x%x) enabled.\n" | |
ff105f75 | 138 | "Filesystem can not be safely mounted by this kernel.", |
6567f1f9 DC |
139 | (sbp->sb_features_incompat & |
140 | XFS_SB_FEAT_INCOMPAT_UNKNOWN)); | |
12b53197 | 141 | return -EINVAL; |
6567f1f9 | 142 | } |
5565d79a DC |
143 | } |
144 | ||
4896e6c8 DC |
145 | if (xfs_sb_version_has_pquotino(sbp)) { |
146 | if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) { | |
147 | xfs_notice(mp, | |
12864fd9 | 148 | "Version 5 of Super block has XFS_OQUOTA bits."); |
12b53197 | 149 | return -EFSCORRUPTED; |
4896e6c8 DC |
150 | } |
151 | } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD | | |
152 | XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) { | |
153 | xfs_notice(mp, | |
12864fd9 | 154 | "Superblock earlier than Version 5 has XFS_[PQ]UOTA_{ENFD|CHKD} bits."); |
12b53197 | 155 | return -EFSCORRUPTED; |
342aef1e CS |
156 | } |
157 | ||
a2ceac1f | 158 | if (unlikely( |
6567f1f9 | 159 | sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { |
a2ceac1f DC |
160 | xfs_warn(mp, |
161 | "filesystem is marked as having an external log; " | |
162 | "specify logdev on the mount command line."); | |
12b53197 | 163 | return -EINVAL; |
a2ceac1f DC |
164 | } |
165 | ||
166 | if (unlikely( | |
6567f1f9 | 167 | sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { |
a2ceac1f DC |
168 | xfs_warn(mp, |
169 | "filesystem is marked as having an internal log; " | |
170 | "do not specify logdev on the mount command line."); | |
12b53197 | 171 | return -EINVAL; |
a2ceac1f DC |
172 | } |
173 | ||
174 | /* | |
175 | * More sanity checking. Most of these were stolen directly from | |
176 | * xfs_repair. | |
177 | */ | |
178 | if (unlikely( | |
179 | sbp->sb_agcount <= 0 || | |
180 | sbp->sb_sectsize < XFS_MIN_SECTORSIZE || | |
181 | sbp->sb_sectsize > XFS_MAX_SECTORSIZE || | |
182 | sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || | |
183 | sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || | |
184 | sbp->sb_sectsize != (1 << sbp->sb_sectlog) || | |
185 | sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || | |
186 | sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || | |
187 | sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || | |
188 | sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || | |
189 | sbp->sb_blocksize != (1 << sbp->sb_blocklog) || | |
5a35bf2c | 190 | sbp->sb_dirblklog > XFS_MAX_BLOCKSIZE_LOG || |
a2ceac1f DC |
191 | sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || |
192 | sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || | |
193 | sbp->sb_inodelog < XFS_DINODE_MIN_LOG || | |
194 | sbp->sb_inodelog > XFS_DINODE_MAX_LOG || | |
195 | sbp->sb_inodesize != (1 << sbp->sb_inodelog) || | |
5a35bf2c | 196 | sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE || |
4b0c789d | 197 | sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) || |
a2ceac1f DC |
198 | (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || |
199 | (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || | |
200 | (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || | |
201 | (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) || | |
202 | sbp->sb_dblocks == 0 || | |
203 | sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) || | |
ff105f75 DC |
204 | sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp) || |
205 | sbp->sb_shared_vn != 0)) { | |
ba5027e0 | 206 | xfs_notice(mp, "SB sanity check failed"); |
12b53197 | 207 | return -EFSCORRUPTED; |
a2ceac1f DC |
208 | } |
209 | ||
210 | /* | |
211 | * Currently only very few inode sizes are supported. | |
212 | */ | |
213 | switch (sbp->sb_inodesize) { | |
214 | case 256: | |
215 | case 512: | |
216 | case 1024: | |
217 | case 2048: | |
218 | break; | |
219 | default: | |
220 | xfs_warn(mp, "inode size of %d bytes not supported", | |
221 | sbp->sb_inodesize); | |
12b53197 | 222 | return -ENOSYS; |
a2ceac1f DC |
223 | } |
224 | ||
4896e6c8 DC |
225 | if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) || |
226 | xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) { | |
227 | xfs_warn(mp, | |
228 | "file system too large to be mounted on this system."); | |
12b53197 | 229 | return -EFBIG; |
4896e6c8 DC |
230 | } |
231 | ||
a2ceac1f DC |
232 | return 0; |
233 | } | |
234 | ||
4896e6c8 DC |
235 | void |
236 | xfs_sb_quota_from_disk(struct xfs_sb *sbp) | |
237 | { | |
238 | /* | |
239 | * older mkfs doesn't initialize quota inodes to NULLFSINO. This | |
240 | * leads to in-core values having two different values for a quota | |
241 | * inode to be invalid: 0 and NULLFSINO. Change it to a single value | |
242 | * NULLFSINO. | |
243 | * | |
244 | * Note that this change affect only the in-core values. These | |
245 | * values are not written back to disk unless any quota information | |
246 | * is written to the disk. Even in that case, sb_pquotino field is | |
247 | * not written to disk unless the superblock supports pquotino. | |
248 | */ | |
249 | if (sbp->sb_uquotino == 0) | |
250 | sbp->sb_uquotino = NULLFSINO; | |
251 | if (sbp->sb_gquotino == 0) | |
252 | sbp->sb_gquotino = NULLFSINO; | |
253 | if (sbp->sb_pquotino == 0) | |
254 | sbp->sb_pquotino = NULLFSINO; | |
255 | ||
256 | /* | |
257 | * We need to do these manipilations only if we are working | |
258 | * with an older version of on-disk superblock. | |
259 | */ | |
260 | if (xfs_sb_version_has_pquotino(sbp)) | |
261 | return; | |
262 | ||
263 | if (sbp->sb_qflags & XFS_OQUOTA_ENFD) | |
264 | sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? | |
265 | XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD; | |
266 | if (sbp->sb_qflags & XFS_OQUOTA_CHKD) | |
267 | sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? | |
268 | XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD; | |
269 | sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD); | |
270 | ||
271 | if (sbp->sb_qflags & XFS_PQUOTA_ACCT) { | |
272 | /* | |
273 | * In older version of superblock, on-disk superblock only | |
274 | * has sb_gquotino, and in-core superblock has both sb_gquotino | |
275 | * and sb_pquotino. But, only one of them is supported at any | |
276 | * point of time. So, if PQUOTA is set in disk superblock, | |
277 | * copy over sb_gquotino to sb_pquotino. | |
278 | */ | |
279 | sbp->sb_pquotino = sbp->sb_gquotino; | |
280 | sbp->sb_gquotino = NULLFSINO; | |
281 | } | |
282 | } | |
283 | ||
5a35bf2c DC |
284 | static void |
285 | __xfs_sb_from_disk( | |
4896e6c8 | 286 | struct xfs_sb *to, |
5a35bf2c DC |
287 | xfs_dsb_t *from, |
288 | bool convert_xquota) | |
5e656dbb BN |
289 | { |
290 | to->sb_magicnum = be32_to_cpu(from->sb_magicnum); | |
291 | to->sb_blocksize = be32_to_cpu(from->sb_blocksize); | |
292 | to->sb_dblocks = be64_to_cpu(from->sb_dblocks); | |
293 | to->sb_rblocks = be64_to_cpu(from->sb_rblocks); | |
294 | to->sb_rextents = be64_to_cpu(from->sb_rextents); | |
295 | memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); | |
296 | to->sb_logstart = be64_to_cpu(from->sb_logstart); | |
297 | to->sb_rootino = be64_to_cpu(from->sb_rootino); | |
298 | to->sb_rbmino = be64_to_cpu(from->sb_rbmino); | |
299 | to->sb_rsumino = be64_to_cpu(from->sb_rsumino); | |
300 | to->sb_rextsize = be32_to_cpu(from->sb_rextsize); | |
301 | to->sb_agblocks = be32_to_cpu(from->sb_agblocks); | |
302 | to->sb_agcount = be32_to_cpu(from->sb_agcount); | |
303 | to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); | |
304 | to->sb_logblocks = be32_to_cpu(from->sb_logblocks); | |
305 | to->sb_versionnum = be16_to_cpu(from->sb_versionnum); | |
306 | to->sb_sectsize = be16_to_cpu(from->sb_sectsize); | |
307 | to->sb_inodesize = be16_to_cpu(from->sb_inodesize); | |
308 | to->sb_inopblock = be16_to_cpu(from->sb_inopblock); | |
309 | memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); | |
310 | to->sb_blocklog = from->sb_blocklog; | |
311 | to->sb_sectlog = from->sb_sectlog; | |
312 | to->sb_inodelog = from->sb_inodelog; | |
313 | to->sb_inopblog = from->sb_inopblog; | |
314 | to->sb_agblklog = from->sb_agblklog; | |
315 | to->sb_rextslog = from->sb_rextslog; | |
316 | to->sb_inprogress = from->sb_inprogress; | |
317 | to->sb_imax_pct = from->sb_imax_pct; | |
318 | to->sb_icount = be64_to_cpu(from->sb_icount); | |
319 | to->sb_ifree = be64_to_cpu(from->sb_ifree); | |
320 | to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); | |
321 | to->sb_frextents = be64_to_cpu(from->sb_frextents); | |
322 | to->sb_uquotino = be64_to_cpu(from->sb_uquotino); | |
323 | to->sb_gquotino = be64_to_cpu(from->sb_gquotino); | |
324 | to->sb_qflags = be16_to_cpu(from->sb_qflags); | |
325 | to->sb_flags = from->sb_flags; | |
326 | to->sb_shared_vn = from->sb_shared_vn; | |
327 | to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); | |
328 | to->sb_unit = be32_to_cpu(from->sb_unit); | |
329 | to->sb_width = be32_to_cpu(from->sb_width); | |
330 | to->sb_dirblklog = from->sb_dirblklog; | |
331 | to->sb_logsectlog = from->sb_logsectlog; | |
332 | to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); | |
333 | to->sb_logsunit = be32_to_cpu(from->sb_logsunit); | |
334 | to->sb_features2 = be32_to_cpu(from->sb_features2); | |
335 | to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2); | |
5565d79a DC |
336 | to->sb_features_compat = be32_to_cpu(from->sb_features_compat); |
337 | to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat); | |
338 | to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat); | |
6567f1f9 DC |
339 | to->sb_features_log_incompat = |
340 | be32_to_cpu(from->sb_features_log_incompat); | |
5a35bf2c DC |
341 | /* crc is only used on disk, not in memory; just init to 0 here. */ |
342 | to->sb_crc = 0; | |
6567f1f9 | 343 | to->sb_pad = 0; |
5565d79a DC |
344 | to->sb_pquotino = be64_to_cpu(from->sb_pquotino); |
345 | to->sb_lsn = be64_to_cpu(from->sb_lsn); | |
5a35bf2c DC |
346 | /* Convert on-disk flags to in-memory flags? */ |
347 | if (convert_xquota) | |
348 | xfs_sb_quota_from_disk(to); | |
349 | } | |
350 | ||
351 | void | |
352 | xfs_sb_from_disk( | |
353 | struct xfs_sb *to, | |
354 | xfs_dsb_t *from) | |
355 | { | |
356 | __xfs_sb_from_disk(to, from, true); | |
5e656dbb BN |
357 | } |
358 | ||
19ebedcf | 359 | static void |
342aef1e | 360 | xfs_sb_quota_to_disk( |
19ebedcf DC |
361 | struct xfs_dsb *to, |
362 | struct xfs_sb *from) | |
342aef1e CS |
363 | { |
364 | __uint16_t qflags = from->sb_qflags; | |
365 | ||
19ebedcf DC |
366 | to->sb_uquotino = cpu_to_be64(from->sb_uquotino); |
367 | if (xfs_sb_version_has_pquotino(from)) { | |
368 | to->sb_qflags = cpu_to_be16(from->sb_qflags); | |
369 | to->sb_gquotino = cpu_to_be64(from->sb_gquotino); | |
370 | to->sb_pquotino = cpu_to_be64(from->sb_pquotino); | |
371 | return; | |
372 | } | |
373 | ||
0340d706 | 374 | /* |
19ebedcf DC |
375 | * The in-core version of sb_qflags do not have XFS_OQUOTA_* |
376 | * flags, whereas the on-disk version does. So, convert incore | |
377 | * XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags. | |
0340d706 | 378 | */ |
19ebedcf DC |
379 | qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD | |
380 | XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD); | |
0340d706 | 381 | |
19ebedcf DC |
382 | if (from->sb_qflags & |
383 | (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD)) | |
384 | qflags |= XFS_OQUOTA_ENFD; | |
385 | if (from->sb_qflags & | |
386 | (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) | |
387 | qflags |= XFS_OQUOTA_CHKD; | |
388 | to->sb_qflags = cpu_to_be16(qflags); | |
0340d706 CS |
389 | |
390 | /* | |
19ebedcf DC |
391 | * GQUOTINO and PQUOTINO cannot be used together in versions |
392 | * of superblock that do not have pquotino. from->sb_flags | |
393 | * tells us which quota is active and should be copied to | |
394 | * disk. If neither are active, we should NULL the inode. | |
ff105f75 | 395 | * |
19ebedcf DC |
396 | * In all cases, the separate pquotino must remain 0 because it |
397 | * it beyond the "end" of the valid non-pquotino superblock. | |
0340d706 | 398 | */ |
19ebedcf | 399 | if (from->sb_qflags & XFS_GQUOTA_ACCT) |
0340d706 | 400 | to->sb_gquotino = cpu_to_be64(from->sb_gquotino); |
19ebedcf | 401 | else if (from->sb_qflags & XFS_PQUOTA_ACCT) |
0340d706 | 402 | to->sb_gquotino = cpu_to_be64(from->sb_pquotino); |
ff105f75 DC |
403 | else { |
404 | /* | |
405 | * We can't rely on just the fields being logged to tell us | |
406 | * that it is safe to write NULLFSINO - we should only do that | |
407 | * if quotas are not actually enabled. Hence only write | |
408 | * NULLFSINO if both in-core quota inodes are NULL. | |
409 | */ | |
410 | if (from->sb_gquotino == NULLFSINO && | |
411 | from->sb_pquotino == NULLFSINO) | |
412 | to->sb_gquotino = cpu_to_be64(NULLFSINO); | |
413 | } | |
0340d706 | 414 | |
19ebedcf | 415 | to->sb_pquotino = 0; |
342aef1e CS |
416 | } |
417 | ||
5e656dbb BN |
418 | void |
419 | xfs_sb_to_disk( | |
19ebedcf DC |
420 | struct xfs_dsb *to, |
421 | struct xfs_sb *from) | |
5e656dbb | 422 | { |
19ebedcf | 423 | xfs_sb_quota_to_disk(to, from); |
5e656dbb | 424 | |
19ebedcf DC |
425 | to->sb_magicnum = cpu_to_be32(from->sb_magicnum); |
426 | to->sb_blocksize = cpu_to_be32(from->sb_blocksize); | |
427 | to->sb_dblocks = cpu_to_be64(from->sb_dblocks); | |
428 | to->sb_rblocks = cpu_to_be64(from->sb_rblocks); | |
429 | to->sb_rextents = cpu_to_be64(from->sb_rextents); | |
430 | memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); | |
431 | to->sb_logstart = cpu_to_be64(from->sb_logstart); | |
432 | to->sb_rootino = cpu_to_be64(from->sb_rootino); | |
433 | to->sb_rbmino = cpu_to_be64(from->sb_rbmino); | |
434 | to->sb_rsumino = cpu_to_be64(from->sb_rsumino); | |
435 | to->sb_rextsize = cpu_to_be32(from->sb_rextsize); | |
436 | to->sb_agblocks = cpu_to_be32(from->sb_agblocks); | |
437 | to->sb_agcount = cpu_to_be32(from->sb_agcount); | |
438 | to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks); | |
439 | to->sb_logblocks = cpu_to_be32(from->sb_logblocks); | |
440 | to->sb_versionnum = cpu_to_be16(from->sb_versionnum); | |
441 | to->sb_sectsize = cpu_to_be16(from->sb_sectsize); | |
442 | to->sb_inodesize = cpu_to_be16(from->sb_inodesize); | |
443 | to->sb_inopblock = cpu_to_be16(from->sb_inopblock); | |
444 | memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); | |
445 | to->sb_blocklog = from->sb_blocklog; | |
446 | to->sb_sectlog = from->sb_sectlog; | |
447 | to->sb_inodelog = from->sb_inodelog; | |
448 | to->sb_inopblog = from->sb_inopblog; | |
449 | to->sb_agblklog = from->sb_agblklog; | |
450 | to->sb_rextslog = from->sb_rextslog; | |
451 | to->sb_inprogress = from->sb_inprogress; | |
452 | to->sb_imax_pct = from->sb_imax_pct; | |
453 | to->sb_icount = cpu_to_be64(from->sb_icount); | |
454 | to->sb_ifree = cpu_to_be64(from->sb_ifree); | |
455 | to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks); | |
456 | to->sb_frextents = cpu_to_be64(from->sb_frextents); | |
457 | ||
458 | to->sb_flags = from->sb_flags; | |
459 | to->sb_shared_vn = from->sb_shared_vn; | |
460 | to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt); | |
461 | to->sb_unit = cpu_to_be32(from->sb_unit); | |
462 | to->sb_width = cpu_to_be32(from->sb_width); | |
463 | to->sb_dirblklog = from->sb_dirblklog; | |
464 | to->sb_logsectlog = from->sb_logsectlog; | |
465 | to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize); | |
466 | to->sb_logsunit = cpu_to_be32(from->sb_logsunit); | |
5e656dbb | 467 | |
19ebedcf DC |
468 | /* |
469 | * We need to ensure that bad_features2 always matches features2. | |
470 | * Hence we enforce that here rather than having to remember to do it | |
471 | * everywhere else that updates features2. | |
472 | */ | |
473 | from->sb_bad_features2 = from->sb_features2; | |
474 | to->sb_features2 = cpu_to_be32(from->sb_features2); | |
475 | to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2); | |
476 | ||
477 | if (xfs_sb_version_hascrc(from)) { | |
478 | to->sb_features_compat = cpu_to_be32(from->sb_features_compat); | |
479 | to->sb_features_ro_compat = | |
480 | cpu_to_be32(from->sb_features_ro_compat); | |
481 | to->sb_features_incompat = | |
482 | cpu_to_be32(from->sb_features_incompat); | |
483 | to->sb_features_log_incompat = | |
484 | cpu_to_be32(from->sb_features_log_incompat); | |
485 | to->sb_pad = 0; | |
486 | to->sb_lsn = cpu_to_be64(from->sb_lsn); | |
5e656dbb BN |
487 | } |
488 | } | |
489 | ||
5565d79a | 490 | static int |
a2ceac1f | 491 | xfs_sb_verify( |
f7b80291 | 492 | struct xfs_buf *bp, |
5629f836 | 493 | bool check_version) |
a2ceac1f DC |
494 | { |
495 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
496 | struct xfs_sb sb; | |
a2ceac1f | 497 | |
5a35bf2c DC |
498 | /* |
499 | * Use call variant which doesn't convert quota flags from disk | |
500 | * format, because xfs_mount_validate_sb checks the on-disk flags. | |
501 | */ | |
502 | __xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp), false); | |
a2ceac1f DC |
503 | |
504 | /* | |
505 | * Only check the in progress field for the primary superblock as | |
506 | * mkfs.xfs doesn't clear it from secondary superblocks. | |
507 | */ | |
5629f836 DC |
508 | return xfs_mount_validate_sb(mp, &sb, bp->b_bn == XFS_SB_DADDR, |
509 | check_version); | |
a2ceac1f DC |
510 | } |
511 | ||
5565d79a DC |
512 | /* |
513 | * If the superblock has the CRC feature bit set or the CRC field is non-null, | |
514 | * check that the CRC is valid. We check the CRC field is non-null because a | |
515 | * single bit error could clear the feature bit and unused parts of the | |
516 | * superblock are supposed to be zero. Hence a non-null crc field indicates that | |
517 | * we've potentially lost a feature bit and we should check it anyway. | |
46ea3a62 DC |
518 | * |
519 | * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the | |
520 | * last field in V4 secondary superblocks. So for secondary superblocks, | |
521 | * we are more forgiving, and ignore CRC failures if the primary doesn't | |
522 | * indicate that the fs version is V5. | |
5565d79a | 523 | */ |
a2ceac1f DC |
524 | static void |
525 | xfs_sb_read_verify( | |
526 | struct xfs_buf *bp) | |
527 | { | |
5565d79a DC |
528 | struct xfs_mount *mp = bp->b_target->bt_mount; |
529 | struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp); | |
530 | int error; | |
531 | ||
532 | /* | |
533 | * open code the version check to avoid needing to convert the entire | |
534 | * superblock from disk order just to check the version number | |
535 | */ | |
536 | if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) && | |
537 | (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) == | |
538 | XFS_SB_VERSION_5) || | |
539 | dsb->sb_crc != 0)) { | |
540 | ||
d21ca64d | 541 | if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) { |
46ea3a62 | 542 | /* Only fail bad secondaries on a known V5 filesystem */ |
f3cddd91 | 543 | if (bp->b_bn == XFS_SB_DADDR || |
46ea3a62 | 544 | xfs_sb_version_hascrc(&mp->m_sb)) { |
12b53197 | 545 | error = -EFSBADCRC; |
46ea3a62 DC |
546 | goto out_error; |
547 | } | |
5565d79a DC |
548 | } |
549 | } | |
f7b80291 | 550 | error = xfs_sb_verify(bp, true); |
5565d79a DC |
551 | |
552 | out_error: | |
553 | if (error) { | |
5565d79a | 554 | xfs_buf_ioerror(bp, error); |
12b53197 | 555 | if (error == -EFSCORRUPTED || error == -EFSBADCRC) |
45922933 | 556 | xfs_verifier_error(bp); |
5565d79a | 557 | } |
a2ceac1f DC |
558 | } |
559 | ||
560 | /* | |
561 | * We may be probed for a filesystem match, so we may not want to emit | |
562 | * messages when the superblock buffer is not actually an XFS superblock. | |
4896e6c8 | 563 | * If we find an XFS superblock, then run a normal, noisy mount because we are |
a2ceac1f DC |
564 | * really going to mount it and want to know about errors. |
565 | */ | |
566 | static void | |
567 | xfs_sb_quiet_read_verify( | |
568 | struct xfs_buf *bp) | |
569 | { | |
5565d79a | 570 | struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp); |
a2ceac1f | 571 | |
5565d79a | 572 | if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) { |
a2ceac1f DC |
573 | /* XFS filesystem, verify noisily! */ |
574 | xfs_sb_read_verify(bp); | |
575 | return; | |
576 | } | |
577 | /* quietly fail */ | |
12b53197 | 578 | xfs_buf_ioerror(bp, -EWRONGFS); |
a2ceac1f DC |
579 | } |
580 | ||
581 | static void | |
582 | xfs_sb_write_verify( | |
5565d79a | 583 | struct xfs_buf *bp) |
a2ceac1f | 584 | { |
5565d79a DC |
585 | struct xfs_mount *mp = bp->b_target->bt_mount; |
586 | struct xfs_buf_log_item *bip = bp->b_fspriv; | |
587 | int error; | |
588 | ||
f7b80291 | 589 | error = xfs_sb_verify(bp, false); |
5565d79a | 590 | if (error) { |
5565d79a | 591 | xfs_buf_ioerror(bp, error); |
45922933 | 592 | xfs_verifier_error(bp); |
5565d79a DC |
593 | return; |
594 | } | |
595 | ||
596 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
597 | return; | |
598 | ||
599 | if (bip) | |
600 | XFS_BUF_TO_SBP(bp)->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn); | |
601 | ||
43b5aeed | 602 | xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF); |
a2ceac1f DC |
603 | } |
604 | ||
605 | const struct xfs_buf_ops xfs_sb_buf_ops = { | |
606 | .verify_read = xfs_sb_read_verify, | |
607 | .verify_write = xfs_sb_write_verify, | |
608 | }; | |
609 | ||
4896e6c8 | 610 | const struct xfs_buf_ops xfs_sb_quiet_buf_ops = { |
a2ceac1f DC |
611 | .verify_read = xfs_sb_quiet_read_verify, |
612 | .verify_write = xfs_sb_write_verify, | |
613 | }; | |
614 | ||
5e656dbb BN |
615 | /* |
616 | * xfs_mount_common | |
617 | * | |
618 | * Mount initialization code establishing various mount | |
619 | * fields from the superblock associated with the given | |
620 | * mount structure | |
5e656dbb BN |
621 | */ |
622 | void | |
4896e6c8 DC |
623 | xfs_sb_mount_common( |
624 | struct xfs_mount *mp, | |
625 | struct xfs_sb *sbp) | |
5e656dbb | 626 | { |
5e656dbb BN |
627 | mp->m_agfrotor = mp->m_agirotor = 0; |
628 | spin_lock_init(&mp->m_agirotor_lock); | |
629 | mp->m_maxagi = mp->m_sb.sb_agcount; | |
630 | mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; | |
631 | mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; | |
632 | mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; | |
633 | mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; | |
634 | mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog; | |
5e656dbb BN |
635 | mp->m_blockmask = sbp->sb_blocksize - 1; |
636 | mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; | |
637 | mp->m_blockwmask = mp->m_blockwsize - 1; | |
5e656dbb | 638 | |
b3563c19 BN |
639 | mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1); |
640 | mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0); | |
641 | mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2; | |
642 | mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2; | |
643 | ||
644 | mp->m_inobt_mxr[0] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 1); | |
645 | mp->m_inobt_mxr[1] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 0); | |
646 | mp->m_inobt_mnr[0] = mp->m_inobt_mxr[0] / 2; | |
647 | mp->m_inobt_mnr[1] = mp->m_inobt_mxr[1] / 2; | |
648 | ||
649 | mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1); | |
650 | mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0); | |
651 | mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2; | |
652 | mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2; | |
5e656dbb BN |
653 | |
654 | mp->m_bsize = XFS_FSB_TO_BB(mp, 1); | |
655 | mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, | |
656 | sbp->sb_inopblock); | |
657 | mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog; | |
658 | } | |
659 | ||
cdded3d8 DC |
660 | /* |
661 | * xfs_initialize_perag_data | |
662 | * | |
663 | * Read in each per-ag structure so we can count up the number of | |
664 | * allocated inodes, free inodes and used filesystem blocks as this | |
665 | * information is no longer persistent in the superblock. Once we have | |
666 | * this information, write it into the in-core superblock structure. | |
667 | */ | |
5e656dbb | 668 | int |
4896e6c8 DC |
669 | xfs_initialize_perag_data( |
670 | struct xfs_mount *mp, | |
671 | xfs_agnumber_t agcount) | |
cdded3d8 DC |
672 | { |
673 | xfs_agnumber_t index; | |
674 | xfs_perag_t *pag; | |
675 | xfs_sb_t *sbp = &mp->m_sb; | |
5e656dbb BN |
676 | uint64_t ifree = 0; |
677 | uint64_t ialloc = 0; | |
678 | uint64_t bfree = 0; | |
679 | uint64_t bfreelst = 0; | |
680 | uint64_t btree = 0; | |
cdded3d8 | 681 | int error; |
cdded3d8 DC |
682 | |
683 | for (index = 0; index < agcount; index++) { | |
684 | /* | |
685 | * read the agf, then the agi. This gets us | |
56b2de80 | 686 | * all the information we need and populates the |
cdded3d8 DC |
687 | * per-ag structures for us. |
688 | */ | |
689 | error = xfs_alloc_pagf_init(mp, NULL, index, 0); | |
690 | if (error) | |
691 | return error; | |
692 | ||
693 | error = xfs_ialloc_pagi_init(mp, NULL, index); | |
694 | if (error) | |
695 | return error; | |
56b2de80 | 696 | pag = xfs_perag_get(mp, index); |
cdded3d8 DC |
697 | ifree += pag->pagi_freecount; |
698 | ialloc += pag->pagi_count; | |
699 | bfree += pag->pagf_freeblks; | |
700 | bfreelst += pag->pagf_flcount; | |
701 | btree += pag->pagf_btreeblks; | |
56b2de80 | 702 | xfs_perag_put(pag); |
cdded3d8 | 703 | } |
19ebedcf DC |
704 | |
705 | /* Overwrite incore superblock counters with just-read data */ | |
5e656dbb | 706 | spin_lock(&mp->m_sb_lock); |
cdded3d8 DC |
707 | sbp->sb_ifree = ifree; |
708 | sbp->sb_icount = ialloc; | |
709 | sbp->sb_fdblocks = bfree + bfreelst + btree; | |
5e656dbb BN |
710 | spin_unlock(&mp->m_sb_lock); |
711 | ||
19ebedcf | 712 | xfs_reinit_percpu_counters(mp); |
5e656dbb | 713 | |
cdded3d8 DC |
714 | return 0; |
715 | } | |
5e656dbb BN |
716 | |
717 | /* | |
19ebedcf DC |
718 | * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock |
719 | * into the superblock buffer to be logged. It does not provide the higher | |
720 | * level of locking that is needed to protect the in-core superblock from | |
721 | * concurrent access. | |
5e656dbb BN |
722 | */ |
723 | void | |
19ebedcf DC |
724 | xfs_log_sb( |
725 | struct xfs_trans *tp) | |
5e656dbb | 726 | { |
19ebedcf DC |
727 | struct xfs_mount *mp = tp->t_mountp; |
728 | struct xfs_buf *bp = xfs_trans_getsb(tp, mp, 0); | |
5e656dbb | 729 | |
19ebedcf DC |
730 | mp->m_sb.sb_icount = percpu_counter_sum(&mp->m_icount); |
731 | mp->m_sb.sb_ifree = percpu_counter_sum(&mp->m_ifree); | |
732 | mp->m_sb.sb_fdblocks = percpu_counter_sum(&mp->m_fdblocks); | |
4896e6c8 | 733 | |
19ebedcf DC |
734 | xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb); |
735 | xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF); | |
736 | xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb)); | |
737 | } | |
5e656dbb | 738 | |
19ebedcf DC |
739 | /* |
740 | * xfs_sync_sb | |
741 | * | |
742 | * Sync the superblock to disk. | |
743 | * | |
744 | * Note that the caller is responsible for checking the frozen state of the | |
745 | * filesystem. This procedure uses the non-blocking transaction allocator and | |
746 | * thus will allow modifications to a frozen fs. This is required because this | |
747 | * code can be called during the process of freezing where use of the high-level | |
748 | * allocator would deadlock. | |
749 | */ | |
750 | int | |
751 | xfs_sync_sb( | |
752 | struct xfs_mount *mp, | |
753 | bool wait) | |
754 | { | |
755 | struct xfs_trans *tp; | |
756 | int error; | |
5e656dbb | 757 | |
19ebedcf DC |
758 | tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_CHANGE, KM_SLEEP); |
759 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0); | |
760 | if (error) { | |
761 | xfs_trans_cancel(tp, 0); | |
762 | return error; | |
763 | } | |
5e656dbb | 764 | |
19ebedcf DC |
765 | xfs_log_sb(tp); |
766 | if (wait) | |
767 | xfs_trans_set_sync(tp); | |
768 | return xfs_trans_commit(tp, 0); | |
5e656dbb | 769 | } |