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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 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. | |
1da177e4 | 13 | * |
7b718769 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 | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 | 24 | #include "xfs_trans.h" |
211e4d43 | 25 | #include "xfs_trans_priv.h" |
1da177e4 LT |
26 | #include "xfs_sb.h" |
27 | #include "xfs_ag.h" | |
1da177e4 | 28 | #include "xfs_dir2.h" |
1da177e4 | 29 | #include "xfs_mount.h" |
1da177e4 | 30 | #include "xfs_bmap_btree.h" |
a844f451 | 31 | #include "xfs_alloc_btree.h" |
1da177e4 | 32 | #include "xfs_ialloc_btree.h" |
1da177e4 LT |
33 | #include "xfs_dinode.h" |
34 | #include "xfs_inode.h" | |
a844f451 NS |
35 | #include "xfs_btree.h" |
36 | #include "xfs_ialloc.h" | |
1da177e4 LT |
37 | #include "xfs_alloc.h" |
38 | #include "xfs_rtalloc.h" | |
39 | #include "xfs_bmap.h" | |
40 | #include "xfs_error.h" | |
1da177e4 LT |
41 | #include "xfs_quota.h" |
42 | #include "xfs_fsops.h" | |
43355099 | 43 | #include "xfs_utils.h" |
0b1b213f | 44 | #include "xfs_trace.h" |
6d8b79cf | 45 | #include "xfs_icache.h" |
0b1b213f | 46 | |
1da177e4 | 47 | |
8d280b98 | 48 | #ifdef HAVE_PERCPU_SB |
20f4ebf2 | 49 | STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t, |
45af6c6d CH |
50 | int); |
51 | STATIC void xfs_icsb_balance_counter_locked(xfs_mount_t *, xfs_sb_field_t, | |
52 | int); | |
36fbe6e6 | 53 | STATIC void xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t); |
8d280b98 DC |
54 | #else |
55 | ||
45af6c6d CH |
56 | #define xfs_icsb_balance_counter(mp, a, b) do { } while (0) |
57 | #define xfs_icsb_balance_counter_locked(mp, a, b) do { } while (0) | |
8d280b98 DC |
58 | #endif |
59 | ||
1df84c93 | 60 | static const struct { |
8d280b98 DC |
61 | short offset; |
62 | short type; /* 0 = integer | |
63 | * 1 = binary / string (no translation) | |
64 | */ | |
1da177e4 LT |
65 | } xfs_sb_info[] = { |
66 | { offsetof(xfs_sb_t, sb_magicnum), 0 }, | |
67 | { offsetof(xfs_sb_t, sb_blocksize), 0 }, | |
68 | { offsetof(xfs_sb_t, sb_dblocks), 0 }, | |
69 | { offsetof(xfs_sb_t, sb_rblocks), 0 }, | |
70 | { offsetof(xfs_sb_t, sb_rextents), 0 }, | |
71 | { offsetof(xfs_sb_t, sb_uuid), 1 }, | |
72 | { offsetof(xfs_sb_t, sb_logstart), 0 }, | |
73 | { offsetof(xfs_sb_t, sb_rootino), 0 }, | |
74 | { offsetof(xfs_sb_t, sb_rbmino), 0 }, | |
75 | { offsetof(xfs_sb_t, sb_rsumino), 0 }, | |
76 | { offsetof(xfs_sb_t, sb_rextsize), 0 }, | |
77 | { offsetof(xfs_sb_t, sb_agblocks), 0 }, | |
78 | { offsetof(xfs_sb_t, sb_agcount), 0 }, | |
79 | { offsetof(xfs_sb_t, sb_rbmblocks), 0 }, | |
80 | { offsetof(xfs_sb_t, sb_logblocks), 0 }, | |
81 | { offsetof(xfs_sb_t, sb_versionnum), 0 }, | |
82 | { offsetof(xfs_sb_t, sb_sectsize), 0 }, | |
83 | { offsetof(xfs_sb_t, sb_inodesize), 0 }, | |
84 | { offsetof(xfs_sb_t, sb_inopblock), 0 }, | |
85 | { offsetof(xfs_sb_t, sb_fname[0]), 1 }, | |
86 | { offsetof(xfs_sb_t, sb_blocklog), 0 }, | |
87 | { offsetof(xfs_sb_t, sb_sectlog), 0 }, | |
88 | { offsetof(xfs_sb_t, sb_inodelog), 0 }, | |
89 | { offsetof(xfs_sb_t, sb_inopblog), 0 }, | |
90 | { offsetof(xfs_sb_t, sb_agblklog), 0 }, | |
91 | { offsetof(xfs_sb_t, sb_rextslog), 0 }, | |
92 | { offsetof(xfs_sb_t, sb_inprogress), 0 }, | |
93 | { offsetof(xfs_sb_t, sb_imax_pct), 0 }, | |
94 | { offsetof(xfs_sb_t, sb_icount), 0 }, | |
95 | { offsetof(xfs_sb_t, sb_ifree), 0 }, | |
96 | { offsetof(xfs_sb_t, sb_fdblocks), 0 }, | |
97 | { offsetof(xfs_sb_t, sb_frextents), 0 }, | |
98 | { offsetof(xfs_sb_t, sb_uquotino), 0 }, | |
99 | { offsetof(xfs_sb_t, sb_gquotino), 0 }, | |
100 | { offsetof(xfs_sb_t, sb_qflags), 0 }, | |
101 | { offsetof(xfs_sb_t, sb_flags), 0 }, | |
102 | { offsetof(xfs_sb_t, sb_shared_vn), 0 }, | |
103 | { offsetof(xfs_sb_t, sb_inoalignmt), 0 }, | |
104 | { offsetof(xfs_sb_t, sb_unit), 0 }, | |
105 | { offsetof(xfs_sb_t, sb_width), 0 }, | |
106 | { offsetof(xfs_sb_t, sb_dirblklog), 0 }, | |
107 | { offsetof(xfs_sb_t, sb_logsectlog), 0 }, | |
108 | { offsetof(xfs_sb_t, sb_logsectsize),0 }, | |
109 | { offsetof(xfs_sb_t, sb_logsunit), 0 }, | |
110 | { offsetof(xfs_sb_t, sb_features2), 0 }, | |
ee1c0908 | 111 | { offsetof(xfs_sb_t, sb_bad_features2), 0 }, |
1da177e4 LT |
112 | { sizeof(xfs_sb_t), 0 } |
113 | }; | |
114 | ||
27174203 CH |
115 | static DEFINE_MUTEX(xfs_uuid_table_mutex); |
116 | static int xfs_uuid_table_size; | |
117 | static uuid_t *xfs_uuid_table; | |
118 | ||
119 | /* | |
120 | * See if the UUID is unique among mounted XFS filesystems. | |
121 | * Mount fails if UUID is nil or a FS with the same UUID is already mounted. | |
122 | */ | |
123 | STATIC int | |
124 | xfs_uuid_mount( | |
125 | struct xfs_mount *mp) | |
126 | { | |
127 | uuid_t *uuid = &mp->m_sb.sb_uuid; | |
128 | int hole, i; | |
129 | ||
130 | if (mp->m_flags & XFS_MOUNT_NOUUID) | |
131 | return 0; | |
132 | ||
133 | if (uuid_is_nil(uuid)) { | |
0b932ccc | 134 | xfs_warn(mp, "Filesystem has nil UUID - can't mount"); |
27174203 CH |
135 | return XFS_ERROR(EINVAL); |
136 | } | |
137 | ||
138 | mutex_lock(&xfs_uuid_table_mutex); | |
139 | for (i = 0, hole = -1; i < xfs_uuid_table_size; i++) { | |
140 | if (uuid_is_nil(&xfs_uuid_table[i])) { | |
141 | hole = i; | |
142 | continue; | |
143 | } | |
144 | if (uuid_equal(uuid, &xfs_uuid_table[i])) | |
145 | goto out_duplicate; | |
146 | } | |
147 | ||
148 | if (hole < 0) { | |
149 | xfs_uuid_table = kmem_realloc(xfs_uuid_table, | |
150 | (xfs_uuid_table_size + 1) * sizeof(*xfs_uuid_table), | |
151 | xfs_uuid_table_size * sizeof(*xfs_uuid_table), | |
152 | KM_SLEEP); | |
153 | hole = xfs_uuid_table_size++; | |
154 | } | |
155 | xfs_uuid_table[hole] = *uuid; | |
156 | mutex_unlock(&xfs_uuid_table_mutex); | |
157 | ||
158 | return 0; | |
159 | ||
160 | out_duplicate: | |
161 | mutex_unlock(&xfs_uuid_table_mutex); | |
021000e5 | 162 | xfs_warn(mp, "Filesystem has duplicate UUID %pU - can't mount", uuid); |
27174203 CH |
163 | return XFS_ERROR(EINVAL); |
164 | } | |
165 | ||
166 | STATIC void | |
167 | xfs_uuid_unmount( | |
168 | struct xfs_mount *mp) | |
169 | { | |
170 | uuid_t *uuid = &mp->m_sb.sb_uuid; | |
171 | int i; | |
172 | ||
173 | if (mp->m_flags & XFS_MOUNT_NOUUID) | |
174 | return; | |
175 | ||
176 | mutex_lock(&xfs_uuid_table_mutex); | |
177 | for (i = 0; i < xfs_uuid_table_size; i++) { | |
178 | if (uuid_is_nil(&xfs_uuid_table[i])) | |
179 | continue; | |
180 | if (!uuid_equal(uuid, &xfs_uuid_table[i])) | |
181 | continue; | |
182 | memset(&xfs_uuid_table[i], 0, sizeof(uuid_t)); | |
183 | break; | |
184 | } | |
185 | ASSERT(i < xfs_uuid_table_size); | |
186 | mutex_unlock(&xfs_uuid_table_mutex); | |
187 | } | |
188 | ||
189 | ||
0fa800fb DC |
190 | /* |
191 | * Reference counting access wrappers to the perag structures. | |
e176579e DC |
192 | * Because we never free per-ag structures, the only thing we |
193 | * have to protect against changes is the tree structure itself. | |
0fa800fb DC |
194 | */ |
195 | struct xfs_perag * | |
196 | xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno) | |
197 | { | |
198 | struct xfs_perag *pag; | |
199 | int ref = 0; | |
200 | ||
e176579e | 201 | rcu_read_lock(); |
0fa800fb DC |
202 | pag = radix_tree_lookup(&mp->m_perag_tree, agno); |
203 | if (pag) { | |
204 | ASSERT(atomic_read(&pag->pag_ref) >= 0); | |
0fa800fb DC |
205 | ref = atomic_inc_return(&pag->pag_ref); |
206 | } | |
e176579e | 207 | rcu_read_unlock(); |
0fa800fb DC |
208 | trace_xfs_perag_get(mp, agno, ref, _RET_IP_); |
209 | return pag; | |
210 | } | |
211 | ||
65d0f205 DC |
212 | /* |
213 | * search from @first to find the next perag with the given tag set. | |
214 | */ | |
215 | struct xfs_perag * | |
216 | xfs_perag_get_tag( | |
217 | struct xfs_mount *mp, | |
218 | xfs_agnumber_t first, | |
219 | int tag) | |
220 | { | |
221 | struct xfs_perag *pag; | |
222 | int found; | |
223 | int ref; | |
224 | ||
225 | rcu_read_lock(); | |
226 | found = radix_tree_gang_lookup_tag(&mp->m_perag_tree, | |
227 | (void **)&pag, first, 1, tag); | |
228 | if (found <= 0) { | |
229 | rcu_read_unlock(); | |
230 | return NULL; | |
231 | } | |
232 | ref = atomic_inc_return(&pag->pag_ref); | |
233 | rcu_read_unlock(); | |
234 | trace_xfs_perag_get_tag(mp, pag->pag_agno, ref, _RET_IP_); | |
235 | return pag; | |
236 | } | |
237 | ||
0fa800fb DC |
238 | void |
239 | xfs_perag_put(struct xfs_perag *pag) | |
240 | { | |
241 | int ref; | |
242 | ||
243 | ASSERT(atomic_read(&pag->pag_ref) > 0); | |
244 | ref = atomic_dec_return(&pag->pag_ref); | |
245 | trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_); | |
246 | } | |
247 | ||
e176579e DC |
248 | STATIC void |
249 | __xfs_free_perag( | |
250 | struct rcu_head *head) | |
251 | { | |
252 | struct xfs_perag *pag = container_of(head, struct xfs_perag, rcu_head); | |
253 | ||
254 | ASSERT(atomic_read(&pag->pag_ref) == 0); | |
255 | kmem_free(pag); | |
256 | } | |
257 | ||
1da177e4 | 258 | /* |
e176579e | 259 | * Free up the per-ag resources associated with the mount structure. |
1da177e4 | 260 | */ |
c962fb79 | 261 | STATIC void |
ff4f038c | 262 | xfs_free_perag( |
745f6919 | 263 | xfs_mount_t *mp) |
1da177e4 | 264 | { |
1c1c6ebc DC |
265 | xfs_agnumber_t agno; |
266 | struct xfs_perag *pag; | |
267 | ||
268 | for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) { | |
269 | spin_lock(&mp->m_perag_lock); | |
270 | pag = radix_tree_delete(&mp->m_perag_tree, agno); | |
271 | spin_unlock(&mp->m_perag_lock); | |
e176579e | 272 | ASSERT(pag); |
f83282a8 | 273 | ASSERT(atomic_read(&pag->pag_ref) == 0); |
e176579e | 274 | call_rcu(&pag->rcu_head, __xfs_free_perag); |
1da177e4 | 275 | } |
1da177e4 LT |
276 | } |
277 | ||
4cc929ee NS |
278 | /* |
279 | * Check size of device based on the (data/realtime) block count. | |
280 | * Note: this check is used by the growfs code as well as mount. | |
281 | */ | |
282 | int | |
283 | xfs_sb_validate_fsb_count( | |
284 | xfs_sb_t *sbp, | |
285 | __uint64_t nblocks) | |
286 | { | |
287 | ASSERT(PAGE_SHIFT >= sbp->sb_blocklog); | |
288 | ASSERT(sbp->sb_blocklog >= BBSHIFT); | |
289 | ||
290 | #if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */ | |
291 | if (nblocks >> (PAGE_CACHE_SHIFT - sbp->sb_blocklog) > ULONG_MAX) | |
657a4cff | 292 | return EFBIG; |
4cc929ee NS |
293 | #else /* Limited by UINT_MAX of sectors */ |
294 | if (nblocks << (sbp->sb_blocklog - BBSHIFT) > UINT_MAX) | |
657a4cff | 295 | return EFBIG; |
4cc929ee NS |
296 | #endif |
297 | return 0; | |
298 | } | |
1da177e4 LT |
299 | |
300 | /* | |
301 | * Check the validity of the SB found. | |
302 | */ | |
303 | STATIC int | |
304 | xfs_mount_validate_sb( | |
305 | xfs_mount_t *mp, | |
764d1f89 NS |
306 | xfs_sb_t *sbp, |
307 | int flags) | |
1da177e4 | 308 | { |
af34e09d DC |
309 | int loud = !(flags & XFS_MFSI_QUIET); |
310 | ||
1da177e4 LT |
311 | /* |
312 | * If the log device and data device have the | |
313 | * same device number, the log is internal. | |
314 | * Consequently, the sb_logstart should be non-zero. If | |
315 | * we have a zero sb_logstart in this case, we may be trying to mount | |
316 | * a volume filesystem in a non-volume manner. | |
317 | */ | |
318 | if (sbp->sb_magicnum != XFS_SB_MAGIC) { | |
af34e09d DC |
319 | if (loud) |
320 | xfs_warn(mp, "bad magic number"); | |
1da177e4 LT |
321 | return XFS_ERROR(EWRONGFS); |
322 | } | |
323 | ||
62118709 | 324 | if (!xfs_sb_good_version(sbp)) { |
af34e09d DC |
325 | if (loud) |
326 | xfs_warn(mp, "bad version"); | |
1da177e4 LT |
327 | return XFS_ERROR(EWRONGFS); |
328 | } | |
329 | ||
330 | if (unlikely( | |
331 | sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { | |
af34e09d DC |
332 | if (loud) |
333 | xfs_warn(mp, | |
334 | "filesystem is marked as having an external log; " | |
335 | "specify logdev on the mount command line."); | |
764d1f89 | 336 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
337 | } |
338 | ||
339 | if (unlikely( | |
340 | sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { | |
af34e09d DC |
341 | if (loud) |
342 | xfs_warn(mp, | |
343 | "filesystem is marked as having an internal log; " | |
344 | "do not specify logdev on the mount command line."); | |
764d1f89 | 345 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
346 | } |
347 | ||
348 | /* | |
c0e090ce | 349 | * More sanity checking. Most of these were stolen directly from |
1da177e4 LT |
350 | * xfs_repair. |
351 | */ | |
352 | if (unlikely( | |
353 | sbp->sb_agcount <= 0 || | |
354 | sbp->sb_sectsize < XFS_MIN_SECTORSIZE || | |
355 | sbp->sb_sectsize > XFS_MAX_SECTORSIZE || | |
356 | sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || | |
357 | sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || | |
2ac00af7 | 358 | sbp->sb_sectsize != (1 << sbp->sb_sectlog) || |
1da177e4 LT |
359 | sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || |
360 | sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || | |
361 | sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || | |
362 | sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || | |
2ac00af7 | 363 | sbp->sb_blocksize != (1 << sbp->sb_blocklog) || |
1da177e4 LT |
364 | sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || |
365 | sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || | |
9f989c94 NS |
366 | sbp->sb_inodelog < XFS_DINODE_MIN_LOG || |
367 | sbp->sb_inodelog > XFS_DINODE_MAX_LOG || | |
2ac00af7 | 368 | sbp->sb_inodesize != (1 << sbp->sb_inodelog) || |
9f989c94 | 369 | (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || |
1da177e4 LT |
370 | (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || |
371 | (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || | |
c0e090ce ES |
372 | (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) || |
373 | sbp->sb_dblocks == 0 || | |
374 | sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) || | |
375 | sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp))) { | |
af34e09d | 376 | if (loud) |
c0e090ce ES |
377 | XFS_CORRUPTION_ERROR("SB sanity check failed", |
378 | XFS_ERRLEVEL_LOW, mp, sbp); | |
1da177e4 LT |
379 | return XFS_ERROR(EFSCORRUPTED); |
380 | } | |
381 | ||
2edbddd5 LM |
382 | /* |
383 | * Until this is fixed only page-sized or smaller data blocks work. | |
384 | */ | |
385 | if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) { | |
af34e09d DC |
386 | if (loud) { |
387 | xfs_warn(mp, | |
388 | "File system with blocksize %d bytes. " | |
389 | "Only pagesize (%ld) or less will currently work.", | |
390 | sbp->sb_blocksize, PAGE_SIZE); | |
391 | } | |
2edbddd5 LM |
392 | return XFS_ERROR(ENOSYS); |
393 | } | |
394 | ||
1a5902c5 CH |
395 | /* |
396 | * Currently only very few inode sizes are supported. | |
397 | */ | |
398 | switch (sbp->sb_inodesize) { | |
399 | case 256: | |
400 | case 512: | |
401 | case 1024: | |
402 | case 2048: | |
403 | break; | |
404 | default: | |
af34e09d DC |
405 | if (loud) |
406 | xfs_warn(mp, "inode size of %d bytes not supported", | |
407 | sbp->sb_inodesize); | |
1a5902c5 CH |
408 | return XFS_ERROR(ENOSYS); |
409 | } | |
410 | ||
4cc929ee NS |
411 | if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) || |
412 | xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) { | |
af34e09d DC |
413 | if (loud) |
414 | xfs_warn(mp, | |
415 | "file system too large to be mounted on this system."); | |
657a4cff | 416 | return XFS_ERROR(EFBIG); |
1da177e4 LT |
417 | } |
418 | ||
419 | if (unlikely(sbp->sb_inprogress)) { | |
af34e09d DC |
420 | if (loud) |
421 | xfs_warn(mp, "file system busy"); | |
1da177e4 LT |
422 | return XFS_ERROR(EFSCORRUPTED); |
423 | } | |
424 | ||
de20614b NS |
425 | /* |
426 | * Version 1 directory format has never worked on Linux. | |
427 | */ | |
62118709 | 428 | if (unlikely(!xfs_sb_version_hasdirv2(sbp))) { |
af34e09d DC |
429 | if (loud) |
430 | xfs_warn(mp, | |
431 | "file system using version 1 directory format"); | |
de20614b NS |
432 | return XFS_ERROR(ENOSYS); |
433 | } | |
434 | ||
1da177e4 LT |
435 | return 0; |
436 | } | |
437 | ||
1c1c6ebc | 438 | int |
c11e2c36 | 439 | xfs_initialize_perag( |
c11e2c36 | 440 | xfs_mount_t *mp, |
1c1c6ebc DC |
441 | xfs_agnumber_t agcount, |
442 | xfs_agnumber_t *maxagi) | |
1da177e4 | 443 | { |
2d2194f6 | 444 | xfs_agnumber_t index; |
8b26c582 | 445 | xfs_agnumber_t first_initialised = 0; |
1da177e4 LT |
446 | xfs_perag_t *pag; |
447 | xfs_agino_t agino; | |
448 | xfs_ino_t ino; | |
449 | xfs_sb_t *sbp = &mp->m_sb; | |
8b26c582 | 450 | int error = -ENOMEM; |
1da177e4 | 451 | |
1c1c6ebc DC |
452 | /* |
453 | * Walk the current per-ag tree so we don't try to initialise AGs | |
454 | * that already exist (growfs case). Allocate and insert all the | |
455 | * AGs we don't find ready for initialisation. | |
456 | */ | |
457 | for (index = 0; index < agcount; index++) { | |
458 | pag = xfs_perag_get(mp, index); | |
459 | if (pag) { | |
460 | xfs_perag_put(pag); | |
461 | continue; | |
462 | } | |
8b26c582 DC |
463 | if (!first_initialised) |
464 | first_initialised = index; | |
fb3b504a | 465 | |
1c1c6ebc DC |
466 | pag = kmem_zalloc(sizeof(*pag), KM_MAYFAIL); |
467 | if (!pag) | |
8b26c582 | 468 | goto out_unwind; |
fb3b504a CH |
469 | pag->pag_agno = index; |
470 | pag->pag_mount = mp; | |
1a427ab0 | 471 | spin_lock_init(&pag->pag_ici_lock); |
69b491c2 | 472 | mutex_init(&pag->pag_ici_reclaim_lock); |
fb3b504a | 473 | INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC); |
74f75a0c DC |
474 | spin_lock_init(&pag->pag_buf_lock); |
475 | pag->pag_buf_tree = RB_ROOT; | |
fb3b504a | 476 | |
1c1c6ebc | 477 | if (radix_tree_preload(GFP_NOFS)) |
8b26c582 | 478 | goto out_unwind; |
fb3b504a | 479 | |
1c1c6ebc DC |
480 | spin_lock(&mp->m_perag_lock); |
481 | if (radix_tree_insert(&mp->m_perag_tree, index, pag)) { | |
482 | BUG(); | |
483 | spin_unlock(&mp->m_perag_lock); | |
8b26c582 DC |
484 | radix_tree_preload_end(); |
485 | error = -EEXIST; | |
486 | goto out_unwind; | |
1c1c6ebc DC |
487 | } |
488 | spin_unlock(&mp->m_perag_lock); | |
489 | radix_tree_preload_end(); | |
490 | } | |
491 | ||
fb3b504a CH |
492 | /* |
493 | * If we mount with the inode64 option, or no inode overflows | |
494 | * the legacy 32-bit address space clear the inode32 option. | |
1da177e4 | 495 | */ |
fb3b504a CH |
496 | agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0); |
497 | ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino); | |
498 | ||
499 | if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32) | |
1da177e4 | 500 | mp->m_flags |= XFS_MOUNT_32BITINODES; |
fb3b504a | 501 | else |
1da177e4 | 502 | mp->m_flags &= ~XFS_MOUNT_32BITINODES; |
1da177e4 | 503 | |
2d2194f6 CM |
504 | if (mp->m_flags & XFS_MOUNT_32BITINODES) |
505 | index = xfs_set_inode32(mp); | |
506 | else | |
507 | index = xfs_set_inode64(mp); | |
fb3b504a | 508 | |
1c1c6ebc DC |
509 | if (maxagi) |
510 | *maxagi = index; | |
511 | return 0; | |
8b26c582 DC |
512 | |
513 | out_unwind: | |
514 | kmem_free(pag); | |
515 | for (; index > first_initialised; index--) { | |
516 | pag = radix_tree_delete(&mp->m_perag_tree, index); | |
517 | kmem_free(pag); | |
518 | } | |
519 | return error; | |
1da177e4 LT |
520 | } |
521 | ||
2bdf7cd0 CH |
522 | void |
523 | xfs_sb_from_disk( | |
6bd92a23 | 524 | struct xfs_mount *mp, |
2bdf7cd0 CH |
525 | xfs_dsb_t *from) |
526 | { | |
6bd92a23 CS |
527 | struct xfs_sb *to = &mp->m_sb; |
528 | ||
2bdf7cd0 CH |
529 | to->sb_magicnum = be32_to_cpu(from->sb_magicnum); |
530 | to->sb_blocksize = be32_to_cpu(from->sb_blocksize); | |
531 | to->sb_dblocks = be64_to_cpu(from->sb_dblocks); | |
532 | to->sb_rblocks = be64_to_cpu(from->sb_rblocks); | |
533 | to->sb_rextents = be64_to_cpu(from->sb_rextents); | |
534 | memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); | |
535 | to->sb_logstart = be64_to_cpu(from->sb_logstart); | |
536 | to->sb_rootino = be64_to_cpu(from->sb_rootino); | |
537 | to->sb_rbmino = be64_to_cpu(from->sb_rbmino); | |
538 | to->sb_rsumino = be64_to_cpu(from->sb_rsumino); | |
539 | to->sb_rextsize = be32_to_cpu(from->sb_rextsize); | |
540 | to->sb_agblocks = be32_to_cpu(from->sb_agblocks); | |
541 | to->sb_agcount = be32_to_cpu(from->sb_agcount); | |
542 | to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); | |
543 | to->sb_logblocks = be32_to_cpu(from->sb_logblocks); | |
544 | to->sb_versionnum = be16_to_cpu(from->sb_versionnum); | |
545 | to->sb_sectsize = be16_to_cpu(from->sb_sectsize); | |
546 | to->sb_inodesize = be16_to_cpu(from->sb_inodesize); | |
547 | to->sb_inopblock = be16_to_cpu(from->sb_inopblock); | |
548 | memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); | |
549 | to->sb_blocklog = from->sb_blocklog; | |
550 | to->sb_sectlog = from->sb_sectlog; | |
551 | to->sb_inodelog = from->sb_inodelog; | |
552 | to->sb_inopblog = from->sb_inopblog; | |
553 | to->sb_agblklog = from->sb_agblklog; | |
554 | to->sb_rextslog = from->sb_rextslog; | |
555 | to->sb_inprogress = from->sb_inprogress; | |
556 | to->sb_imax_pct = from->sb_imax_pct; | |
557 | to->sb_icount = be64_to_cpu(from->sb_icount); | |
558 | to->sb_ifree = be64_to_cpu(from->sb_ifree); | |
559 | to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); | |
560 | to->sb_frextents = be64_to_cpu(from->sb_frextents); | |
561 | to->sb_uquotino = be64_to_cpu(from->sb_uquotino); | |
562 | to->sb_gquotino = be64_to_cpu(from->sb_gquotino); | |
563 | to->sb_qflags = be16_to_cpu(from->sb_qflags); | |
564 | to->sb_flags = from->sb_flags; | |
565 | to->sb_shared_vn = from->sb_shared_vn; | |
566 | to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); | |
567 | to->sb_unit = be32_to_cpu(from->sb_unit); | |
568 | to->sb_width = be32_to_cpu(from->sb_width); | |
569 | to->sb_dirblklog = from->sb_dirblklog; | |
570 | to->sb_logsectlog = from->sb_logsectlog; | |
571 | to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); | |
572 | to->sb_logsunit = be32_to_cpu(from->sb_logsunit); | |
573 | to->sb_features2 = be32_to_cpu(from->sb_features2); | |
ee1c0908 | 574 | to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2); |
2bdf7cd0 CH |
575 | } |
576 | ||
1da177e4 | 577 | /* |
2bdf7cd0 | 578 | * Copy in core superblock to ondisk one. |
1da177e4 | 579 | * |
2bdf7cd0 | 580 | * The fields argument is mask of superblock fields to copy. |
1da177e4 LT |
581 | */ |
582 | void | |
2bdf7cd0 CH |
583 | xfs_sb_to_disk( |
584 | xfs_dsb_t *to, | |
585 | xfs_sb_t *from, | |
1da177e4 LT |
586 | __int64_t fields) |
587 | { | |
2bdf7cd0 CH |
588 | xfs_caddr_t to_ptr = (xfs_caddr_t)to; |
589 | xfs_caddr_t from_ptr = (xfs_caddr_t)from; | |
1da177e4 LT |
590 | xfs_sb_field_t f; |
591 | int first; | |
592 | int size; | |
593 | ||
1da177e4 | 594 | ASSERT(fields); |
1da177e4 LT |
595 | if (!fields) |
596 | return; | |
597 | ||
1da177e4 LT |
598 | while (fields) { |
599 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
600 | first = xfs_sb_info[f].offset; | |
601 | size = xfs_sb_info[f + 1].offset - first; | |
602 | ||
603 | ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1); | |
604 | ||
605 | if (size == 1 || xfs_sb_info[f].type == 1) { | |
2bdf7cd0 | 606 | memcpy(to_ptr + first, from_ptr + first, size); |
1da177e4 LT |
607 | } else { |
608 | switch (size) { | |
609 | case 2: | |
2bdf7cd0 CH |
610 | *(__be16 *)(to_ptr + first) = |
611 | cpu_to_be16(*(__u16 *)(from_ptr + first)); | |
1da177e4 LT |
612 | break; |
613 | case 4: | |
2bdf7cd0 CH |
614 | *(__be32 *)(to_ptr + first) = |
615 | cpu_to_be32(*(__u32 *)(from_ptr + first)); | |
1da177e4 LT |
616 | break; |
617 | case 8: | |
2bdf7cd0 CH |
618 | *(__be64 *)(to_ptr + first) = |
619 | cpu_to_be64(*(__u64 *)(from_ptr + first)); | |
1da177e4 LT |
620 | break; |
621 | default: | |
622 | ASSERT(0); | |
623 | } | |
624 | } | |
625 | ||
626 | fields &= ~(1LL << f); | |
627 | } | |
628 | } | |
629 | ||
630 | /* | |
631 | * xfs_readsb | |
632 | * | |
633 | * Does the initial read of the superblock. | |
634 | */ | |
635 | int | |
764d1f89 | 636 | xfs_readsb(xfs_mount_t *mp, int flags) |
1da177e4 LT |
637 | { |
638 | unsigned int sector_size; | |
1da177e4 | 639 | xfs_buf_t *bp; |
1da177e4 | 640 | int error; |
af34e09d | 641 | int loud = !(flags & XFS_MFSI_QUIET); |
1da177e4 LT |
642 | |
643 | ASSERT(mp->m_sb_bp == NULL); | |
644 | ASSERT(mp->m_ddev_targp != NULL); | |
645 | ||
646 | /* | |
647 | * Allocate a (locked) buffer to hold the superblock. | |
648 | * This will be kept around at all times to optimize | |
649 | * access to the superblock. | |
650 | */ | |
651 | sector_size = xfs_getsize_buftarg(mp->m_ddev_targp); | |
26af6552 DC |
652 | |
653 | reread: | |
e70b73f8 DC |
654 | bp = xfs_buf_read_uncached(mp->m_ddev_targp, XFS_SB_DADDR, |
655 | BTOBB(sector_size), 0); | |
26af6552 | 656 | if (!bp) { |
af34e09d DC |
657 | if (loud) |
658 | xfs_warn(mp, "SB buffer read failed"); | |
26af6552 | 659 | return EIO; |
1da177e4 | 660 | } |
1da177e4 LT |
661 | |
662 | /* | |
663 | * Initialize the mount structure from the superblock. | |
664 | * But first do some basic consistency checking. | |
665 | */ | |
6bd92a23 | 666 | xfs_sb_from_disk(mp, XFS_BUF_TO_SBP(bp)); |
764d1f89 | 667 | error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags); |
1da177e4 | 668 | if (error) { |
af34e09d DC |
669 | if (loud) |
670 | xfs_warn(mp, "SB validate failed"); | |
26af6552 | 671 | goto release_buf; |
1da177e4 LT |
672 | } |
673 | ||
674 | /* | |
675 | * We must be able to do sector-sized and sector-aligned IO. | |
676 | */ | |
677 | if (sector_size > mp->m_sb.sb_sectsize) { | |
af34e09d DC |
678 | if (loud) |
679 | xfs_warn(mp, "device supports %u byte sectors (not %u)", | |
680 | sector_size, mp->m_sb.sb_sectsize); | |
1da177e4 | 681 | error = ENOSYS; |
26af6552 | 682 | goto release_buf; |
1da177e4 LT |
683 | } |
684 | ||
685 | /* | |
686 | * If device sector size is smaller than the superblock size, | |
687 | * re-read the superblock so the buffer is correctly sized. | |
688 | */ | |
689 | if (sector_size < mp->m_sb.sb_sectsize) { | |
1da177e4 LT |
690 | xfs_buf_relse(bp); |
691 | sector_size = mp->m_sb.sb_sectsize; | |
26af6552 | 692 | goto reread; |
1da177e4 LT |
693 | } |
694 | ||
5478eead LM |
695 | /* Initialize per-cpu counters */ |
696 | xfs_icsb_reinit_counters(mp); | |
8d280b98 | 697 | |
1da177e4 | 698 | mp->m_sb_bp = bp; |
26af6552 | 699 | xfs_buf_unlock(bp); |
1da177e4 LT |
700 | return 0; |
701 | ||
26af6552 DC |
702 | release_buf: |
703 | xfs_buf_relse(bp); | |
1da177e4 LT |
704 | return error; |
705 | } | |
706 | ||
707 | ||
708 | /* | |
709 | * xfs_mount_common | |
710 | * | |
711 | * Mount initialization code establishing various mount | |
712 | * fields from the superblock associated with the given | |
713 | * mount structure | |
714 | */ | |
ba0f32d4 | 715 | STATIC void |
1da177e4 LT |
716 | xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp) |
717 | { | |
1da177e4 | 718 | mp->m_agfrotor = mp->m_agirotor = 0; |
007c61c6 | 719 | spin_lock_init(&mp->m_agirotor_lock); |
1da177e4 LT |
720 | mp->m_maxagi = mp->m_sb.sb_agcount; |
721 | mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; | |
722 | mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; | |
723 | mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; | |
724 | mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; | |
725 | mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog; | |
1da177e4 LT |
726 | mp->m_blockmask = sbp->sb_blocksize - 1; |
727 | mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; | |
728 | mp->m_blockwmask = mp->m_blockwsize - 1; | |
1da177e4 | 729 | |
60197e8d CH |
730 | mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1); |
731 | mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0); | |
732 | mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2; | |
733 | mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2; | |
734 | ||
735 | mp->m_inobt_mxr[0] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 1); | |
736 | mp->m_inobt_mxr[1] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 0); | |
737 | mp->m_inobt_mnr[0] = mp->m_inobt_mxr[0] / 2; | |
738 | mp->m_inobt_mnr[1] = mp->m_inobt_mxr[1] / 2; | |
739 | ||
740 | mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1); | |
741 | mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0); | |
742 | mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2; | |
743 | mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2; | |
1da177e4 LT |
744 | |
745 | mp->m_bsize = XFS_FSB_TO_BB(mp, 1); | |
746 | mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, | |
747 | sbp->sb_inopblock); | |
748 | mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog; | |
749 | } | |
92821e2b DC |
750 | |
751 | /* | |
752 | * xfs_initialize_perag_data | |
753 | * | |
754 | * Read in each per-ag structure so we can count up the number of | |
755 | * allocated inodes, free inodes and used filesystem blocks as this | |
756 | * information is no longer persistent in the superblock. Once we have | |
757 | * this information, write it into the in-core superblock structure. | |
758 | */ | |
759 | STATIC int | |
760 | xfs_initialize_perag_data(xfs_mount_t *mp, xfs_agnumber_t agcount) | |
761 | { | |
762 | xfs_agnumber_t index; | |
763 | xfs_perag_t *pag; | |
764 | xfs_sb_t *sbp = &mp->m_sb; | |
765 | uint64_t ifree = 0; | |
766 | uint64_t ialloc = 0; | |
767 | uint64_t bfree = 0; | |
768 | uint64_t bfreelst = 0; | |
769 | uint64_t btree = 0; | |
770 | int error; | |
92821e2b DC |
771 | |
772 | for (index = 0; index < agcount; index++) { | |
773 | /* | |
774 | * read the agf, then the agi. This gets us | |
9da096fd | 775 | * all the information we need and populates the |
92821e2b DC |
776 | * per-ag structures for us. |
777 | */ | |
778 | error = xfs_alloc_pagf_init(mp, NULL, index, 0); | |
779 | if (error) | |
780 | return error; | |
781 | ||
782 | error = xfs_ialloc_pagi_init(mp, NULL, index); | |
783 | if (error) | |
784 | return error; | |
44b56e0a | 785 | pag = xfs_perag_get(mp, index); |
92821e2b DC |
786 | ifree += pag->pagi_freecount; |
787 | ialloc += pag->pagi_count; | |
788 | bfree += pag->pagf_freeblks; | |
789 | bfreelst += pag->pagf_flcount; | |
790 | btree += pag->pagf_btreeblks; | |
44b56e0a | 791 | xfs_perag_put(pag); |
92821e2b DC |
792 | } |
793 | /* | |
794 | * Overwrite incore superblock counters with just-read data | |
795 | */ | |
3685c2a1 | 796 | spin_lock(&mp->m_sb_lock); |
92821e2b DC |
797 | sbp->sb_ifree = ifree; |
798 | sbp->sb_icount = ialloc; | |
799 | sbp->sb_fdblocks = bfree + bfreelst + btree; | |
3685c2a1 | 800 | spin_unlock(&mp->m_sb_lock); |
92821e2b DC |
801 | |
802 | /* Fixup the per-cpu counters as well. */ | |
803 | xfs_icsb_reinit_counters(mp); | |
804 | ||
805 | return 0; | |
806 | } | |
807 | ||
1da177e4 | 808 | /* |
0771fb45 | 809 | * Update alignment values based on mount options and sb values |
1da177e4 | 810 | */ |
0771fb45 | 811 | STATIC int |
7884bc86 | 812 | xfs_update_alignment(xfs_mount_t *mp) |
1da177e4 | 813 | { |
1da177e4 | 814 | xfs_sb_t *sbp = &(mp->m_sb); |
1da177e4 | 815 | |
4249023a | 816 | if (mp->m_dalign) { |
1da177e4 LT |
817 | /* |
818 | * If stripe unit and stripe width are not multiples | |
819 | * of the fs blocksize turn off alignment. | |
820 | */ | |
821 | if ((BBTOB(mp->m_dalign) & mp->m_blockmask) || | |
822 | (BBTOB(mp->m_swidth) & mp->m_blockmask)) { | |
823 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
c0e090ce ES |
824 | xfs_warn(mp, "alignment check failed: " |
825 | "(sunit/swidth vs. blocksize)"); | |
0771fb45 | 826 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
827 | } |
828 | mp->m_dalign = mp->m_swidth = 0; | |
829 | } else { | |
830 | /* | |
831 | * Convert the stripe unit and width to FSBs. | |
832 | */ | |
833 | mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign); | |
834 | if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) { | |
835 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
c0e090ce ES |
836 | xfs_warn(mp, "alignment check failed: " |
837 | "(sunit/swidth vs. ag size)"); | |
0771fb45 | 838 | return XFS_ERROR(EINVAL); |
1da177e4 | 839 | } |
53487786 DC |
840 | xfs_warn(mp, |
841 | "stripe alignment turned off: sunit(%d)/swidth(%d) " | |
842 | "incompatible with agsize(%d)", | |
1da177e4 LT |
843 | mp->m_dalign, mp->m_swidth, |
844 | sbp->sb_agblocks); | |
845 | ||
846 | mp->m_dalign = 0; | |
847 | mp->m_swidth = 0; | |
848 | } else if (mp->m_dalign) { | |
849 | mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth); | |
850 | } else { | |
851 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
c0e090ce ES |
852 | xfs_warn(mp, "alignment check failed: " |
853 | "sunit(%d) less than bsize(%d)", | |
53487786 | 854 | mp->m_dalign, |
1da177e4 | 855 | mp->m_blockmask +1); |
0771fb45 | 856 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
857 | } |
858 | mp->m_swidth = 0; | |
859 | } | |
860 | } | |
861 | ||
862 | /* | |
863 | * Update superblock with new values | |
864 | * and log changes | |
865 | */ | |
62118709 | 866 | if (xfs_sb_version_hasdalign(sbp)) { |
1da177e4 LT |
867 | if (sbp->sb_unit != mp->m_dalign) { |
868 | sbp->sb_unit = mp->m_dalign; | |
7884bc86 | 869 | mp->m_update_flags |= XFS_SB_UNIT; |
1da177e4 LT |
870 | } |
871 | if (sbp->sb_width != mp->m_swidth) { | |
872 | sbp->sb_width = mp->m_swidth; | |
7884bc86 | 873 | mp->m_update_flags |= XFS_SB_WIDTH; |
1da177e4 LT |
874 | } |
875 | } | |
876 | } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN && | |
62118709 | 877 | xfs_sb_version_hasdalign(&mp->m_sb)) { |
1da177e4 LT |
878 | mp->m_dalign = sbp->sb_unit; |
879 | mp->m_swidth = sbp->sb_width; | |
880 | } | |
881 | ||
0771fb45 ES |
882 | return 0; |
883 | } | |
1da177e4 | 884 | |
0771fb45 ES |
885 | /* |
886 | * Set the maximum inode count for this filesystem | |
887 | */ | |
888 | STATIC void | |
889 | xfs_set_maxicount(xfs_mount_t *mp) | |
890 | { | |
891 | xfs_sb_t *sbp = &(mp->m_sb); | |
892 | __uint64_t icount; | |
1da177e4 | 893 | |
0771fb45 ES |
894 | if (sbp->sb_imax_pct) { |
895 | /* | |
896 | * Make sure the maximum inode count is a multiple | |
897 | * of the units we allocate inodes in. | |
1da177e4 | 898 | */ |
1da177e4 LT |
899 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; |
900 | do_div(icount, 100); | |
901 | do_div(icount, mp->m_ialloc_blks); | |
902 | mp->m_maxicount = (icount * mp->m_ialloc_blks) << | |
903 | sbp->sb_inopblog; | |
0771fb45 | 904 | } else { |
1da177e4 | 905 | mp->m_maxicount = 0; |
1da177e4 | 906 | } |
0771fb45 ES |
907 | } |
908 | ||
909 | /* | |
910 | * Set the default minimum read and write sizes unless | |
911 | * already specified in a mount option. | |
912 | * We use smaller I/O sizes when the file system | |
913 | * is being used for NFS service (wsync mount option). | |
914 | */ | |
915 | STATIC void | |
916 | xfs_set_rw_sizes(xfs_mount_t *mp) | |
917 | { | |
918 | xfs_sb_t *sbp = &(mp->m_sb); | |
919 | int readio_log, writeio_log; | |
1da177e4 | 920 | |
1da177e4 LT |
921 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { |
922 | if (mp->m_flags & XFS_MOUNT_WSYNC) { | |
923 | readio_log = XFS_WSYNC_READIO_LOG; | |
924 | writeio_log = XFS_WSYNC_WRITEIO_LOG; | |
925 | } else { | |
926 | readio_log = XFS_READIO_LOG_LARGE; | |
927 | writeio_log = XFS_WRITEIO_LOG_LARGE; | |
928 | } | |
929 | } else { | |
930 | readio_log = mp->m_readio_log; | |
931 | writeio_log = mp->m_writeio_log; | |
932 | } | |
933 | ||
1da177e4 LT |
934 | if (sbp->sb_blocklog > readio_log) { |
935 | mp->m_readio_log = sbp->sb_blocklog; | |
936 | } else { | |
937 | mp->m_readio_log = readio_log; | |
938 | } | |
939 | mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog); | |
940 | if (sbp->sb_blocklog > writeio_log) { | |
941 | mp->m_writeio_log = sbp->sb_blocklog; | |
942 | } else { | |
943 | mp->m_writeio_log = writeio_log; | |
944 | } | |
945 | mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog); | |
0771fb45 | 946 | } |
1da177e4 | 947 | |
055388a3 DC |
948 | /* |
949 | * precalculate the low space thresholds for dynamic speculative preallocation. | |
950 | */ | |
951 | void | |
952 | xfs_set_low_space_thresholds( | |
953 | struct xfs_mount *mp) | |
954 | { | |
955 | int i; | |
956 | ||
957 | for (i = 0; i < XFS_LOWSP_MAX; i++) { | |
958 | __uint64_t space = mp->m_sb.sb_dblocks; | |
959 | ||
960 | do_div(space, 100); | |
961 | mp->m_low_space[i] = space * (i + 1); | |
962 | } | |
963 | } | |
964 | ||
965 | ||
0771fb45 ES |
966 | /* |
967 | * Set whether we're using inode alignment. | |
968 | */ | |
969 | STATIC void | |
970 | xfs_set_inoalignment(xfs_mount_t *mp) | |
971 | { | |
62118709 | 972 | if (xfs_sb_version_hasalign(&mp->m_sb) && |
1da177e4 LT |
973 | mp->m_sb.sb_inoalignmt >= |
974 | XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size)) | |
975 | mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1; | |
976 | else | |
977 | mp->m_inoalign_mask = 0; | |
978 | /* | |
979 | * If we are using stripe alignment, check whether | |
980 | * the stripe unit is a multiple of the inode alignment | |
981 | */ | |
982 | if (mp->m_dalign && mp->m_inoalign_mask && | |
983 | !(mp->m_dalign & mp->m_inoalign_mask)) | |
984 | mp->m_sinoalign = mp->m_dalign; | |
985 | else | |
986 | mp->m_sinoalign = 0; | |
0771fb45 ES |
987 | } |
988 | ||
989 | /* | |
990 | * Check that the data (and log if separate) are an ok size. | |
991 | */ | |
992 | STATIC int | |
4249023a | 993 | xfs_check_sizes(xfs_mount_t *mp) |
0771fb45 ES |
994 | { |
995 | xfs_buf_t *bp; | |
996 | xfs_daddr_t d; | |
0771fb45 | 997 | |
1da177e4 LT |
998 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); |
999 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) { | |
0b932ccc | 1000 | xfs_warn(mp, "filesystem size mismatch detected"); |
657a4cff | 1001 | return XFS_ERROR(EFBIG); |
1da177e4 | 1002 | } |
e70b73f8 | 1003 | bp = xfs_buf_read_uncached(mp->m_ddev_targp, |
1922c949 | 1004 | d - XFS_FSS_TO_BB(mp, 1), |
e70b73f8 | 1005 | XFS_FSS_TO_BB(mp, 1), 0); |
1922c949 | 1006 | if (!bp) { |
0b932ccc | 1007 | xfs_warn(mp, "last sector read failed"); |
1922c949 | 1008 | return EIO; |
1da177e4 | 1009 | } |
1922c949 | 1010 | xfs_buf_relse(bp); |
1da177e4 | 1011 | |
4249023a | 1012 | if (mp->m_logdev_targp != mp->m_ddev_targp) { |
1da177e4 LT |
1013 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks); |
1014 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) { | |
0b932ccc | 1015 | xfs_warn(mp, "log size mismatch detected"); |
657a4cff | 1016 | return XFS_ERROR(EFBIG); |
1da177e4 | 1017 | } |
e70b73f8 | 1018 | bp = xfs_buf_read_uncached(mp->m_logdev_targp, |
1922c949 | 1019 | d - XFS_FSB_TO_BB(mp, 1), |
e70b73f8 | 1020 | XFS_FSB_TO_BB(mp, 1), 0); |
1922c949 | 1021 | if (!bp) { |
0b932ccc | 1022 | xfs_warn(mp, "log device read failed"); |
1922c949 | 1023 | return EIO; |
0771fb45 | 1024 | } |
1922c949 | 1025 | xfs_buf_relse(bp); |
0771fb45 ES |
1026 | } |
1027 | return 0; | |
1028 | } | |
1029 | ||
7d095257 CH |
1030 | /* |
1031 | * Clear the quotaflags in memory and in the superblock. | |
1032 | */ | |
1033 | int | |
1034 | xfs_mount_reset_sbqflags( | |
1035 | struct xfs_mount *mp) | |
1036 | { | |
1037 | int error; | |
1038 | struct xfs_trans *tp; | |
1039 | ||
1040 | mp->m_qflags = 0; | |
1041 | ||
1042 | /* | |
1043 | * It is OK to look at sb_qflags here in mount path, | |
1044 | * without m_sb_lock. | |
1045 | */ | |
1046 | if (mp->m_sb.sb_qflags == 0) | |
1047 | return 0; | |
1048 | spin_lock(&mp->m_sb_lock); | |
1049 | mp->m_sb.sb_qflags = 0; | |
1050 | spin_unlock(&mp->m_sb_lock); | |
1051 | ||
1052 | /* | |
1053 | * If the fs is readonly, let the incore superblock run | |
1054 | * with quotas off but don't flush the update out to disk | |
1055 | */ | |
1056 | if (mp->m_flags & XFS_MOUNT_RDONLY) | |
1057 | return 0; | |
1058 | ||
7d095257 CH |
1059 | tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE); |
1060 | error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, | |
1061 | XFS_DEFAULT_LOG_COUNT); | |
1062 | if (error) { | |
1063 | xfs_trans_cancel(tp, 0); | |
53487786 | 1064 | xfs_alert(mp, "%s: Superblock update failed!", __func__); |
7d095257 CH |
1065 | return error; |
1066 | } | |
1067 | ||
1068 | xfs_mod_sb(tp, XFS_SB_QFLAGS); | |
1069 | return xfs_trans_commit(tp, 0); | |
1070 | } | |
1071 | ||
d5db0f97 ES |
1072 | __uint64_t |
1073 | xfs_default_resblks(xfs_mount_t *mp) | |
1074 | { | |
1075 | __uint64_t resblks; | |
1076 | ||
1077 | /* | |
8babd8a2 DC |
1078 | * We default to 5% or 8192 fsbs of space reserved, whichever is |
1079 | * smaller. This is intended to cover concurrent allocation | |
1080 | * transactions when we initially hit enospc. These each require a 4 | |
1081 | * block reservation. Hence by default we cover roughly 2000 concurrent | |
1082 | * allocation reservations. | |
d5db0f97 ES |
1083 | */ |
1084 | resblks = mp->m_sb.sb_dblocks; | |
1085 | do_div(resblks, 20); | |
8babd8a2 | 1086 | resblks = min_t(__uint64_t, resblks, 8192); |
d5db0f97 ES |
1087 | return resblks; |
1088 | } | |
1089 | ||
0771fb45 | 1090 | /* |
0771fb45 ES |
1091 | * This function does the following on an initial mount of a file system: |
1092 | * - reads the superblock from disk and init the mount struct | |
1093 | * - if we're a 32-bit kernel, do a size check on the superblock | |
1094 | * so we don't mount terabyte filesystems | |
1095 | * - init mount struct realtime fields | |
1096 | * - allocate inode hash table for fs | |
1097 | * - init directory manager | |
1098 | * - perform recovery and init the log manager | |
1099 | */ | |
1100 | int | |
1101 | xfs_mountfs( | |
4249023a | 1102 | xfs_mount_t *mp) |
0771fb45 ES |
1103 | { |
1104 | xfs_sb_t *sbp = &(mp->m_sb); | |
1105 | xfs_inode_t *rip; | |
0771fb45 | 1106 | __uint64_t resblks; |
7d095257 CH |
1107 | uint quotamount = 0; |
1108 | uint quotaflags = 0; | |
0771fb45 ES |
1109 | int error = 0; |
1110 | ||
0771fb45 ES |
1111 | xfs_mount_common(mp, sbp); |
1112 | ||
ee1c0908 | 1113 | /* |
e6957ea4 ES |
1114 | * Check for a mismatched features2 values. Older kernels |
1115 | * read & wrote into the wrong sb offset for sb_features2 | |
1116 | * on some platforms due to xfs_sb_t not being 64bit size aligned | |
1117 | * when sb_features2 was added, which made older superblock | |
1118 | * reading/writing routines swap it as a 64-bit value. | |
ee1c0908 | 1119 | * |
e6957ea4 ES |
1120 | * For backwards compatibility, we make both slots equal. |
1121 | * | |
1122 | * If we detect a mismatched field, we OR the set bits into the | |
1123 | * existing features2 field in case it has already been modified; we | |
1124 | * don't want to lose any features. We then update the bad location | |
1125 | * with the ORed value so that older kernels will see any features2 | |
1126 | * flags, and mark the two fields as needing updates once the | |
1127 | * transaction subsystem is online. | |
ee1c0908 | 1128 | */ |
e6957ea4 | 1129 | if (xfs_sb_has_mismatched_features2(sbp)) { |
0b932ccc | 1130 | xfs_warn(mp, "correcting sb_features alignment problem"); |
ee1c0908 | 1131 | sbp->sb_features2 |= sbp->sb_bad_features2; |
e6957ea4 | 1132 | sbp->sb_bad_features2 = sbp->sb_features2; |
7884bc86 | 1133 | mp->m_update_flags |= XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2; |
e6957ea4 ES |
1134 | |
1135 | /* | |
1136 | * Re-check for ATTR2 in case it was found in bad_features2 | |
1137 | * slot. | |
1138 | */ | |
7c12f296 TS |
1139 | if (xfs_sb_version_hasattr2(&mp->m_sb) && |
1140 | !(mp->m_flags & XFS_MOUNT_NOATTR2)) | |
e6957ea4 | 1141 | mp->m_flags |= XFS_MOUNT_ATTR2; |
7c12f296 TS |
1142 | } |
1143 | ||
1144 | if (xfs_sb_version_hasattr2(&mp->m_sb) && | |
1145 | (mp->m_flags & XFS_MOUNT_NOATTR2)) { | |
1146 | xfs_sb_version_removeattr2(&mp->m_sb); | |
7884bc86 | 1147 | mp->m_update_flags |= XFS_SB_FEATURES2; |
e6957ea4 | 1148 | |
7c12f296 TS |
1149 | /* update sb_versionnum for the clearing of the morebits */ |
1150 | if (!sbp->sb_features2) | |
7884bc86 | 1151 | mp->m_update_flags |= XFS_SB_VERSIONNUM; |
ee1c0908 DC |
1152 | } |
1153 | ||
0771fb45 ES |
1154 | /* |
1155 | * Check if sb_agblocks is aligned at stripe boundary | |
1156 | * If sb_agblocks is NOT aligned turn off m_dalign since | |
1157 | * allocator alignment is within an ag, therefore ag has | |
1158 | * to be aligned at stripe boundary. | |
1159 | */ | |
7884bc86 | 1160 | error = xfs_update_alignment(mp); |
0771fb45 | 1161 | if (error) |
f9057e3d | 1162 | goto out; |
0771fb45 ES |
1163 | |
1164 | xfs_alloc_compute_maxlevels(mp); | |
1165 | xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK); | |
1166 | xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK); | |
1167 | xfs_ialloc_compute_maxlevels(mp); | |
1168 | ||
1169 | xfs_set_maxicount(mp); | |
1170 | ||
27174203 CH |
1171 | error = xfs_uuid_mount(mp); |
1172 | if (error) | |
1173 | goto out; | |
1da177e4 | 1174 | |
0771fb45 ES |
1175 | /* |
1176 | * Set the minimum read and write sizes | |
1177 | */ | |
1178 | xfs_set_rw_sizes(mp); | |
1179 | ||
055388a3 DC |
1180 | /* set the low space thresholds for dynamic preallocation */ |
1181 | xfs_set_low_space_thresholds(mp); | |
1182 | ||
0771fb45 ES |
1183 | /* |
1184 | * Set the inode cluster size. | |
1185 | * This may still be overridden by the file system | |
1186 | * block size if it is larger than the chosen cluster size. | |
1187 | */ | |
1188 | mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE; | |
1189 | ||
1190 | /* | |
1191 | * Set inode alignment fields | |
1192 | */ | |
1193 | xfs_set_inoalignment(mp); | |
1194 | ||
1195 | /* | |
1196 | * Check that the data (and log if separate) are an ok size. | |
1197 | */ | |
4249023a | 1198 | error = xfs_check_sizes(mp); |
0771fb45 | 1199 | if (error) |
f9057e3d | 1200 | goto out_remove_uuid; |
0771fb45 | 1201 | |
1da177e4 LT |
1202 | /* |
1203 | * Initialize realtime fields in the mount structure | |
1204 | */ | |
0771fb45 ES |
1205 | error = xfs_rtmount_init(mp); |
1206 | if (error) { | |
0b932ccc | 1207 | xfs_warn(mp, "RT mount failed"); |
f9057e3d | 1208 | goto out_remove_uuid; |
1da177e4 LT |
1209 | } |
1210 | ||
1da177e4 LT |
1211 | /* |
1212 | * Copies the low order bits of the timestamp and the randomly | |
1213 | * set "sequence" number out of a UUID. | |
1214 | */ | |
1215 | uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid); | |
1216 | ||
1da177e4 LT |
1217 | mp->m_dmevmask = 0; /* not persistent; set after each mount */ |
1218 | ||
f6c2d1fa | 1219 | xfs_dir_mount(mp); |
1da177e4 LT |
1220 | |
1221 | /* | |
1222 | * Initialize the attribute manager's entries. | |
1223 | */ | |
1224 | mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100; | |
1225 | ||
1226 | /* | |
1227 | * Initialize the precomputed transaction reservations values. | |
1228 | */ | |
1229 | xfs_trans_init(mp); | |
1230 | ||
1da177e4 LT |
1231 | /* |
1232 | * Allocate and initialize the per-ag data. | |
1233 | */ | |
1c1c6ebc | 1234 | spin_lock_init(&mp->m_perag_lock); |
9b98b6f3 | 1235 | INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC); |
1c1c6ebc DC |
1236 | error = xfs_initialize_perag(mp, sbp->sb_agcount, &mp->m_maxagi); |
1237 | if (error) { | |
0b932ccc | 1238 | xfs_warn(mp, "Failed per-ag init: %d", error); |
f9057e3d | 1239 | goto out_remove_uuid; |
1c1c6ebc | 1240 | } |
1da177e4 | 1241 | |
f9057e3d | 1242 | if (!sbp->sb_logblocks) { |
0b932ccc | 1243 | xfs_warn(mp, "no log defined"); |
f9057e3d CH |
1244 | XFS_ERROR_REPORT("xfs_mountfs", XFS_ERRLEVEL_LOW, mp); |
1245 | error = XFS_ERROR(EFSCORRUPTED); | |
1246 | goto out_free_perag; | |
1247 | } | |
1248 | ||
1da177e4 LT |
1249 | /* |
1250 | * log's mount-time initialization. Perform 1st part recovery if needed | |
1251 | */ | |
f9057e3d CH |
1252 | error = xfs_log_mount(mp, mp->m_logdev_targp, |
1253 | XFS_FSB_TO_DADDR(mp, sbp->sb_logstart), | |
1254 | XFS_FSB_TO_BB(mp, sbp->sb_logblocks)); | |
1255 | if (error) { | |
0b932ccc | 1256 | xfs_warn(mp, "log mount failed"); |
d4f3512b | 1257 | goto out_fail_wait; |
1da177e4 LT |
1258 | } |
1259 | ||
92821e2b DC |
1260 | /* |
1261 | * Now the log is mounted, we know if it was an unclean shutdown or | |
1262 | * not. If it was, with the first phase of recovery has completed, we | |
1263 | * have consistent AG blocks on disk. We have not recovered EFIs yet, | |
1264 | * but they are recovered transactionally in the second recovery phase | |
1265 | * later. | |
1266 | * | |
1267 | * Hence we can safely re-initialise incore superblock counters from | |
1268 | * the per-ag data. These may not be correct if the filesystem was not | |
1269 | * cleanly unmounted, so we need to wait for recovery to finish before | |
1270 | * doing this. | |
1271 | * | |
1272 | * If the filesystem was cleanly unmounted, then we can trust the | |
1273 | * values in the superblock to be correct and we don't need to do | |
1274 | * anything here. | |
1275 | * | |
1276 | * If we are currently making the filesystem, the initialisation will | |
1277 | * fail as the perag data is in an undefined state. | |
1278 | */ | |
92821e2b DC |
1279 | if (xfs_sb_version_haslazysbcount(&mp->m_sb) && |
1280 | !XFS_LAST_UNMOUNT_WAS_CLEAN(mp) && | |
1281 | !mp->m_sb.sb_inprogress) { | |
1282 | error = xfs_initialize_perag_data(mp, sbp->sb_agcount); | |
f9057e3d | 1283 | if (error) |
d4f3512b | 1284 | goto out_fail_wait; |
92821e2b | 1285 | } |
f9057e3d | 1286 | |
1da177e4 LT |
1287 | /* |
1288 | * Get and sanity-check the root inode. | |
1289 | * Save the pointer to it in the mount structure. | |
1290 | */ | |
7b6259e7 | 1291 | error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip); |
1da177e4 | 1292 | if (error) { |
0b932ccc | 1293 | xfs_warn(mp, "failed to read root inode"); |
f9057e3d | 1294 | goto out_log_dealloc; |
1da177e4 LT |
1295 | } |
1296 | ||
1297 | ASSERT(rip != NULL); | |
1da177e4 | 1298 | |
abbede1b | 1299 | if (unlikely(!S_ISDIR(rip->i_d.di_mode))) { |
0b932ccc | 1300 | xfs_warn(mp, "corrupted root inode %llu: not a directory", |
b6574520 | 1301 | (unsigned long long)rip->i_ino); |
1da177e4 LT |
1302 | xfs_iunlock(rip, XFS_ILOCK_EXCL); |
1303 | XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW, | |
1304 | mp); | |
1305 | error = XFS_ERROR(EFSCORRUPTED); | |
f9057e3d | 1306 | goto out_rele_rip; |
1da177e4 LT |
1307 | } |
1308 | mp->m_rootip = rip; /* save it */ | |
1309 | ||
1310 | xfs_iunlock(rip, XFS_ILOCK_EXCL); | |
1311 | ||
1312 | /* | |
1313 | * Initialize realtime inode pointers in the mount structure | |
1314 | */ | |
0771fb45 ES |
1315 | error = xfs_rtmount_inodes(mp); |
1316 | if (error) { | |
1da177e4 LT |
1317 | /* |
1318 | * Free up the root inode. | |
1319 | */ | |
0b932ccc | 1320 | xfs_warn(mp, "failed to read RT inodes"); |
f9057e3d | 1321 | goto out_rele_rip; |
1da177e4 LT |
1322 | } |
1323 | ||
1324 | /* | |
7884bc86 CH |
1325 | * If this is a read-only mount defer the superblock updates until |
1326 | * the next remount into writeable mode. Otherwise we would never | |
1327 | * perform the update e.g. for the root filesystem. | |
1da177e4 | 1328 | */ |
7884bc86 CH |
1329 | if (mp->m_update_flags && !(mp->m_flags & XFS_MOUNT_RDONLY)) { |
1330 | error = xfs_mount_log_sb(mp, mp->m_update_flags); | |
e5720eec | 1331 | if (error) { |
0b932ccc | 1332 | xfs_warn(mp, "failed to write sb changes"); |
b93b6e43 | 1333 | goto out_rtunmount; |
e5720eec DC |
1334 | } |
1335 | } | |
1da177e4 LT |
1336 | |
1337 | /* | |
1338 | * Initialise the XFS quota management subsystem for this mount | |
1339 | */ | |
7d095257 CH |
1340 | if (XFS_IS_QUOTA_RUNNING(mp)) { |
1341 | error = xfs_qm_newmount(mp, "amount, "aflags); | |
1342 | if (error) | |
1343 | goto out_rtunmount; | |
1344 | } else { | |
1345 | ASSERT(!XFS_IS_QUOTA_ON(mp)); | |
1346 | ||
1347 | /* | |
1348 | * If a file system had quotas running earlier, but decided to | |
1349 | * mount without -o uquota/pquota/gquota options, revoke the | |
1350 | * quotachecked license. | |
1351 | */ | |
1352 | if (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT) { | |
0b932ccc | 1353 | xfs_notice(mp, "resetting quota flags"); |
7d095257 CH |
1354 | error = xfs_mount_reset_sbqflags(mp); |
1355 | if (error) | |
1356 | return error; | |
1357 | } | |
1358 | } | |
1da177e4 LT |
1359 | |
1360 | /* | |
1361 | * Finish recovering the file system. This part needed to be | |
1362 | * delayed until after the root and real-time bitmap inodes | |
1363 | * were consistently read in. | |
1364 | */ | |
4249023a | 1365 | error = xfs_log_mount_finish(mp); |
1da177e4 | 1366 | if (error) { |
0b932ccc | 1367 | xfs_warn(mp, "log mount finish failed"); |
b93b6e43 | 1368 | goto out_rtunmount; |
1da177e4 LT |
1369 | } |
1370 | ||
1371 | /* | |
1372 | * Complete the quota initialisation, post-log-replay component. | |
1373 | */ | |
7d095257 CH |
1374 | if (quotamount) { |
1375 | ASSERT(mp->m_qflags == 0); | |
1376 | mp->m_qflags = quotaflags; | |
1377 | ||
1378 | xfs_qm_mount_quotas(mp); | |
1379 | } | |
1380 | ||
84e1e99f DC |
1381 | /* |
1382 | * Now we are mounted, reserve a small amount of unused space for | |
1383 | * privileged transactions. This is needed so that transaction | |
1384 | * space required for critical operations can dip into this pool | |
1385 | * when at ENOSPC. This is needed for operations like create with | |
1386 | * attr, unwritten extent conversion at ENOSPC, etc. Data allocations | |
1387 | * are not allowed to use this reserved space. | |
8babd8a2 DC |
1388 | * |
1389 | * This may drive us straight to ENOSPC on mount, but that implies | |
1390 | * we were already there on the last unmount. Warn if this occurs. | |
84e1e99f | 1391 | */ |
d5db0f97 ES |
1392 | if (!(mp->m_flags & XFS_MOUNT_RDONLY)) { |
1393 | resblks = xfs_default_resblks(mp); | |
1394 | error = xfs_reserve_blocks(mp, &resblks, NULL); | |
1395 | if (error) | |
0b932ccc DC |
1396 | xfs_warn(mp, |
1397 | "Unable to allocate reserve blocks. Continuing without reserve pool."); | |
d5db0f97 | 1398 | } |
84e1e99f | 1399 | |
1da177e4 LT |
1400 | return 0; |
1401 | ||
b93b6e43 CH |
1402 | out_rtunmount: |
1403 | xfs_rtunmount_inodes(mp); | |
f9057e3d | 1404 | out_rele_rip: |
43355099 | 1405 | IRELE(rip); |
f9057e3d | 1406 | out_log_dealloc: |
21b699c8 | 1407 | xfs_log_unmount(mp); |
d4f3512b DC |
1408 | out_fail_wait: |
1409 | if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) | |
1410 | xfs_wait_buftarg(mp->m_logdev_targp); | |
1411 | xfs_wait_buftarg(mp->m_ddev_targp); | |
f9057e3d | 1412 | out_free_perag: |
ff4f038c | 1413 | xfs_free_perag(mp); |
f9057e3d | 1414 | out_remove_uuid: |
27174203 | 1415 | xfs_uuid_unmount(mp); |
f9057e3d | 1416 | out: |
1da177e4 LT |
1417 | return error; |
1418 | } | |
1419 | ||
1420 | /* | |
1da177e4 LT |
1421 | * This flushes out the inodes,dquots and the superblock, unmounts the |
1422 | * log and makes sure that incore structures are freed. | |
1423 | */ | |
41b5c2e7 CH |
1424 | void |
1425 | xfs_unmountfs( | |
1426 | struct xfs_mount *mp) | |
1da177e4 | 1427 | { |
41b5c2e7 CH |
1428 | __uint64_t resblks; |
1429 | int error; | |
1da177e4 | 1430 | |
579b62fa BF |
1431 | cancel_delayed_work_sync(&mp->m_eofblocks_work); |
1432 | ||
7d095257 | 1433 | xfs_qm_unmount_quotas(mp); |
b93b6e43 | 1434 | xfs_rtunmount_inodes(mp); |
77508ec8 CH |
1435 | IRELE(mp->m_rootip); |
1436 | ||
641c56fb DC |
1437 | /* |
1438 | * We can potentially deadlock here if we have an inode cluster | |
9da096fd | 1439 | * that has been freed has its buffer still pinned in memory because |
641c56fb DC |
1440 | * the transaction is still sitting in a iclog. The stale inodes |
1441 | * on that buffer will have their flush locks held until the | |
1442 | * transaction hits the disk and the callbacks run. the inode | |
1443 | * flush takes the flush lock unconditionally and with nothing to | |
1444 | * push out the iclog we will never get that unlocked. hence we | |
1445 | * need to force the log first. | |
1446 | */ | |
a14a348b | 1447 | xfs_log_force(mp, XFS_LOG_SYNC); |
c854363e DC |
1448 | |
1449 | /* | |
211e4d43 CH |
1450 | * Flush all pending changes from the AIL. |
1451 | */ | |
1452 | xfs_ail_push_all_sync(mp->m_ail); | |
1453 | ||
1454 | /* | |
1455 | * And reclaim all inodes. At this point there should be no dirty | |
7e18530b DC |
1456 | * inodes and none should be pinned or locked, but use synchronous |
1457 | * reclaim just to be sure. We can stop background inode reclaim | |
1458 | * here as well if it is still running. | |
c854363e | 1459 | */ |
7e18530b | 1460 | cancel_delayed_work_sync(&mp->m_reclaim_work); |
c854363e | 1461 | xfs_reclaim_inodes(mp, SYNC_WAIT); |
1da177e4 | 1462 | |
7d095257 | 1463 | xfs_qm_unmount(mp); |
a357a121 | 1464 | |
84e1e99f DC |
1465 | /* |
1466 | * Unreserve any blocks we have so that when we unmount we don't account | |
1467 | * the reserved free space as used. This is really only necessary for | |
1468 | * lazy superblock counting because it trusts the incore superblock | |
9da096fd | 1469 | * counters to be absolutely correct on clean unmount. |
84e1e99f DC |
1470 | * |
1471 | * We don't bother correcting this elsewhere for lazy superblock | |
1472 | * counting because on mount of an unclean filesystem we reconstruct the | |
1473 | * correct counter value and this is irrelevant. | |
1474 | * | |
1475 | * For non-lazy counter filesystems, this doesn't matter at all because | |
1476 | * we only every apply deltas to the superblock and hence the incore | |
1477 | * value does not matter.... | |
1478 | */ | |
1479 | resblks = 0; | |
714082bc DC |
1480 | error = xfs_reserve_blocks(mp, &resblks, NULL); |
1481 | if (error) | |
0b932ccc | 1482 | xfs_warn(mp, "Unable to free reserved block pool. " |
714082bc DC |
1483 | "Freespace may not be correct on next mount."); |
1484 | ||
adab0f67 | 1485 | error = xfs_log_sbcount(mp); |
e5720eec | 1486 | if (error) |
0b932ccc | 1487 | xfs_warn(mp, "Unable to update superblock counters. " |
e5720eec | 1488 | "Freespace may not be correct on next mount."); |
87c7bec7 | 1489 | |
21b699c8 | 1490 | xfs_log_unmount(mp); |
27174203 | 1491 | xfs_uuid_unmount(mp); |
1da177e4 | 1492 | |
1550d0b0 | 1493 | #if defined(DEBUG) |
0ce4cfd4 | 1494 | xfs_errortag_clearall(mp, 0); |
1da177e4 | 1495 | #endif |
ff4f038c | 1496 | xfs_free_perag(mp); |
1da177e4 LT |
1497 | } |
1498 | ||
92821e2b DC |
1499 | int |
1500 | xfs_fs_writable(xfs_mount_t *mp) | |
1501 | { | |
d9457dc0 | 1502 | return !(mp->m_super->s_writers.frozen || XFS_FORCED_SHUTDOWN(mp) || |
bd186aa9 | 1503 | (mp->m_flags & XFS_MOUNT_RDONLY)); |
92821e2b DC |
1504 | } |
1505 | ||
1506 | /* | |
b2ce3974 AE |
1507 | * xfs_log_sbcount |
1508 | * | |
adab0f67 | 1509 | * Sync the superblock counters to disk. |
b2ce3974 AE |
1510 | * |
1511 | * Note this code can be called during the process of freezing, so | |
adab0f67 | 1512 | * we may need to use the transaction allocator which does not |
b2ce3974 | 1513 | * block when the transaction subsystem is in its frozen state. |
92821e2b DC |
1514 | */ |
1515 | int | |
adab0f67 | 1516 | xfs_log_sbcount(xfs_mount_t *mp) |
92821e2b DC |
1517 | { |
1518 | xfs_trans_t *tp; | |
1519 | int error; | |
1520 | ||
1521 | if (!xfs_fs_writable(mp)) | |
1522 | return 0; | |
1523 | ||
d4d90b57 | 1524 | xfs_icsb_sync_counters(mp, 0); |
92821e2b DC |
1525 | |
1526 | /* | |
1527 | * we don't need to do this if we are updating the superblock | |
1528 | * counters on every modification. | |
1529 | */ | |
1530 | if (!xfs_sb_version_haslazysbcount(&mp->m_sb)) | |
1531 | return 0; | |
1532 | ||
b2ce3974 | 1533 | tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_COUNT, KM_SLEEP); |
92821e2b DC |
1534 | error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, |
1535 | XFS_DEFAULT_LOG_COUNT); | |
1536 | if (error) { | |
1537 | xfs_trans_cancel(tp, 0); | |
1538 | return error; | |
1539 | } | |
1540 | ||
1541 | xfs_mod_sb(tp, XFS_SB_IFREE | XFS_SB_ICOUNT | XFS_SB_FDBLOCKS); | |
adab0f67 | 1542 | xfs_trans_set_sync(tp); |
e5720eec DC |
1543 | error = xfs_trans_commit(tp, 0); |
1544 | return error; | |
92821e2b DC |
1545 | } |
1546 | ||
1da177e4 LT |
1547 | /* |
1548 | * xfs_mod_sb() can be used to copy arbitrary changes to the | |
1549 | * in-core superblock into the superblock buffer to be logged. | |
1550 | * It does not provide the higher level of locking that is | |
1551 | * needed to protect the in-core superblock from concurrent | |
1552 | * access. | |
1553 | */ | |
1554 | void | |
1555 | xfs_mod_sb(xfs_trans_t *tp, __int64_t fields) | |
1556 | { | |
1557 | xfs_buf_t *bp; | |
1558 | int first; | |
1559 | int last; | |
1560 | xfs_mount_t *mp; | |
1da177e4 LT |
1561 | xfs_sb_field_t f; |
1562 | ||
1563 | ASSERT(fields); | |
1564 | if (!fields) | |
1565 | return; | |
1566 | mp = tp->t_mountp; | |
1567 | bp = xfs_trans_getsb(tp, mp, 0); | |
1da177e4 LT |
1568 | first = sizeof(xfs_sb_t); |
1569 | last = 0; | |
1570 | ||
1571 | /* translate/copy */ | |
1572 | ||
2bdf7cd0 | 1573 | xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields); |
1da177e4 LT |
1574 | |
1575 | /* find modified range */ | |
587aa0fe DC |
1576 | f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields); |
1577 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1578 | last = xfs_sb_info[f + 1].offset - 1; | |
1da177e4 LT |
1579 | |
1580 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
1581 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1582 | first = xfs_sb_info[f].offset; | |
1583 | ||
1da177e4 LT |
1584 | xfs_trans_log_buf(tp, bp, first, last); |
1585 | } | |
d210a28c | 1586 | |
d210a28c | 1587 | |
1da177e4 LT |
1588 | /* |
1589 | * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply | |
1590 | * a delta to a specified field in the in-core superblock. Simply | |
1591 | * switch on the field indicated and apply the delta to that field. | |
1592 | * Fields are not allowed to dip below zero, so if the delta would | |
1593 | * do this do not apply it and return EINVAL. | |
1594 | * | |
3685c2a1 | 1595 | * The m_sb_lock must be held when this routine is called. |
1da177e4 | 1596 | */ |
d96f8f89 | 1597 | STATIC int |
20f4ebf2 DC |
1598 | xfs_mod_incore_sb_unlocked( |
1599 | xfs_mount_t *mp, | |
1600 | xfs_sb_field_t field, | |
1601 | int64_t delta, | |
1602 | int rsvd) | |
1da177e4 LT |
1603 | { |
1604 | int scounter; /* short counter for 32 bit fields */ | |
1605 | long long lcounter; /* long counter for 64 bit fields */ | |
1606 | long long res_used, rem; | |
1607 | ||
1608 | /* | |
1609 | * With the in-core superblock spin lock held, switch | |
1610 | * on the indicated field. Apply the delta to the | |
1611 | * proper field. If the fields value would dip below | |
1612 | * 0, then do not apply the delta and return EINVAL. | |
1613 | */ | |
1614 | switch (field) { | |
1615 | case XFS_SBS_ICOUNT: | |
1616 | lcounter = (long long)mp->m_sb.sb_icount; | |
1617 | lcounter += delta; | |
1618 | if (lcounter < 0) { | |
1619 | ASSERT(0); | |
014c2544 | 1620 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1621 | } |
1622 | mp->m_sb.sb_icount = lcounter; | |
014c2544 | 1623 | return 0; |
1da177e4 LT |
1624 | case XFS_SBS_IFREE: |
1625 | lcounter = (long long)mp->m_sb.sb_ifree; | |
1626 | lcounter += delta; | |
1627 | if (lcounter < 0) { | |
1628 | ASSERT(0); | |
014c2544 | 1629 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1630 | } |
1631 | mp->m_sb.sb_ifree = lcounter; | |
014c2544 | 1632 | return 0; |
1da177e4 | 1633 | case XFS_SBS_FDBLOCKS: |
4be536de DC |
1634 | lcounter = (long long) |
1635 | mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); | |
1da177e4 LT |
1636 | res_used = (long long)(mp->m_resblks - mp->m_resblks_avail); |
1637 | ||
1638 | if (delta > 0) { /* Putting blocks back */ | |
1639 | if (res_used > delta) { | |
1640 | mp->m_resblks_avail += delta; | |
1641 | } else { | |
1642 | rem = delta - res_used; | |
1643 | mp->m_resblks_avail = mp->m_resblks; | |
1644 | lcounter += rem; | |
1645 | } | |
1646 | } else { /* Taking blocks away */ | |
1da177e4 | 1647 | lcounter += delta; |
8babd8a2 DC |
1648 | if (lcounter >= 0) { |
1649 | mp->m_sb.sb_fdblocks = lcounter + | |
1650 | XFS_ALLOC_SET_ASIDE(mp); | |
1651 | return 0; | |
1652 | } | |
1da177e4 | 1653 | |
8babd8a2 DC |
1654 | /* |
1655 | * We are out of blocks, use any available reserved | |
1656 | * blocks if were allowed to. | |
1657 | */ | |
1658 | if (!rsvd) | |
1659 | return XFS_ERROR(ENOSPC); | |
1da177e4 | 1660 | |
8babd8a2 DC |
1661 | lcounter = (long long)mp->m_resblks_avail + delta; |
1662 | if (lcounter >= 0) { | |
1663 | mp->m_resblks_avail = lcounter; | |
1664 | return 0; | |
1da177e4 | 1665 | } |
8babd8a2 DC |
1666 | printk_once(KERN_WARNING |
1667 | "Filesystem \"%s\": reserve blocks depleted! " | |
1668 | "Consider increasing reserve pool size.", | |
1669 | mp->m_fsname); | |
1670 | return XFS_ERROR(ENOSPC); | |
1da177e4 LT |
1671 | } |
1672 | ||
4be536de | 1673 | mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
014c2544 | 1674 | return 0; |
1da177e4 LT |
1675 | case XFS_SBS_FREXTENTS: |
1676 | lcounter = (long long)mp->m_sb.sb_frextents; | |
1677 | lcounter += delta; | |
1678 | if (lcounter < 0) { | |
014c2544 | 1679 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1680 | } |
1681 | mp->m_sb.sb_frextents = lcounter; | |
014c2544 | 1682 | return 0; |
1da177e4 LT |
1683 | case XFS_SBS_DBLOCKS: |
1684 | lcounter = (long long)mp->m_sb.sb_dblocks; | |
1685 | lcounter += delta; | |
1686 | if (lcounter < 0) { | |
1687 | ASSERT(0); | |
014c2544 | 1688 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1689 | } |
1690 | mp->m_sb.sb_dblocks = lcounter; | |
014c2544 | 1691 | return 0; |
1da177e4 LT |
1692 | case XFS_SBS_AGCOUNT: |
1693 | scounter = mp->m_sb.sb_agcount; | |
1694 | scounter += delta; | |
1695 | if (scounter < 0) { | |
1696 | ASSERT(0); | |
014c2544 | 1697 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1698 | } |
1699 | mp->m_sb.sb_agcount = scounter; | |
014c2544 | 1700 | return 0; |
1da177e4 LT |
1701 | case XFS_SBS_IMAX_PCT: |
1702 | scounter = mp->m_sb.sb_imax_pct; | |
1703 | scounter += delta; | |
1704 | if (scounter < 0) { | |
1705 | ASSERT(0); | |
014c2544 | 1706 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1707 | } |
1708 | mp->m_sb.sb_imax_pct = scounter; | |
014c2544 | 1709 | return 0; |
1da177e4 LT |
1710 | case XFS_SBS_REXTSIZE: |
1711 | scounter = mp->m_sb.sb_rextsize; | |
1712 | scounter += delta; | |
1713 | if (scounter < 0) { | |
1714 | ASSERT(0); | |
014c2544 | 1715 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1716 | } |
1717 | mp->m_sb.sb_rextsize = scounter; | |
014c2544 | 1718 | return 0; |
1da177e4 LT |
1719 | case XFS_SBS_RBMBLOCKS: |
1720 | scounter = mp->m_sb.sb_rbmblocks; | |
1721 | scounter += delta; | |
1722 | if (scounter < 0) { | |
1723 | ASSERT(0); | |
014c2544 | 1724 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1725 | } |
1726 | mp->m_sb.sb_rbmblocks = scounter; | |
014c2544 | 1727 | return 0; |
1da177e4 LT |
1728 | case XFS_SBS_RBLOCKS: |
1729 | lcounter = (long long)mp->m_sb.sb_rblocks; | |
1730 | lcounter += delta; | |
1731 | if (lcounter < 0) { | |
1732 | ASSERT(0); | |
014c2544 | 1733 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1734 | } |
1735 | mp->m_sb.sb_rblocks = lcounter; | |
014c2544 | 1736 | return 0; |
1da177e4 LT |
1737 | case XFS_SBS_REXTENTS: |
1738 | lcounter = (long long)mp->m_sb.sb_rextents; | |
1739 | lcounter += delta; | |
1740 | if (lcounter < 0) { | |
1741 | ASSERT(0); | |
014c2544 | 1742 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1743 | } |
1744 | mp->m_sb.sb_rextents = lcounter; | |
014c2544 | 1745 | return 0; |
1da177e4 LT |
1746 | case XFS_SBS_REXTSLOG: |
1747 | scounter = mp->m_sb.sb_rextslog; | |
1748 | scounter += delta; | |
1749 | if (scounter < 0) { | |
1750 | ASSERT(0); | |
014c2544 | 1751 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1752 | } |
1753 | mp->m_sb.sb_rextslog = scounter; | |
014c2544 | 1754 | return 0; |
1da177e4 LT |
1755 | default: |
1756 | ASSERT(0); | |
014c2544 | 1757 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1758 | } |
1759 | } | |
1760 | ||
1761 | /* | |
1762 | * xfs_mod_incore_sb() is used to change a field in the in-core | |
1763 | * superblock structure by the specified delta. This modification | |
3685c2a1 | 1764 | * is protected by the m_sb_lock. Just use the xfs_mod_incore_sb_unlocked() |
1da177e4 LT |
1765 | * routine to do the work. |
1766 | */ | |
1767 | int | |
20f4ebf2 | 1768 | xfs_mod_incore_sb( |
96540c78 CH |
1769 | struct xfs_mount *mp, |
1770 | xfs_sb_field_t field, | |
1771 | int64_t delta, | |
1772 | int rsvd) | |
1da177e4 | 1773 | { |
96540c78 | 1774 | int status; |
1da177e4 | 1775 | |
8d280b98 | 1776 | #ifdef HAVE_PERCPU_SB |
96540c78 | 1777 | ASSERT(field < XFS_SBS_ICOUNT || field > XFS_SBS_FDBLOCKS); |
8d280b98 | 1778 | #endif |
96540c78 CH |
1779 | spin_lock(&mp->m_sb_lock); |
1780 | status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); | |
1781 | spin_unlock(&mp->m_sb_lock); | |
8d280b98 | 1782 | |
014c2544 | 1783 | return status; |
1da177e4 LT |
1784 | } |
1785 | ||
1786 | /* | |
1b040712 | 1787 | * Change more than one field in the in-core superblock structure at a time. |
1da177e4 | 1788 | * |
1b040712 CH |
1789 | * The fields and changes to those fields are specified in the array of |
1790 | * xfs_mod_sb structures passed in. Either all of the specified deltas | |
1791 | * will be applied or none of them will. If any modified field dips below 0, | |
1792 | * then all modifications will be backed out and EINVAL will be returned. | |
1793 | * | |
1794 | * Note that this function may not be used for the superblock values that | |
1795 | * are tracked with the in-memory per-cpu counters - a direct call to | |
1796 | * xfs_icsb_modify_counters is required for these. | |
1da177e4 LT |
1797 | */ |
1798 | int | |
1b040712 CH |
1799 | xfs_mod_incore_sb_batch( |
1800 | struct xfs_mount *mp, | |
1801 | xfs_mod_sb_t *msb, | |
1802 | uint nmsb, | |
1803 | int rsvd) | |
1da177e4 | 1804 | { |
45c51b99 | 1805 | xfs_mod_sb_t *msbp; |
1b040712 | 1806 | int error = 0; |
1da177e4 LT |
1807 | |
1808 | /* | |
1b040712 CH |
1809 | * Loop through the array of mod structures and apply each individually. |
1810 | * If any fail, then back out all those which have already been applied. | |
1811 | * Do all of this within the scope of the m_sb_lock so that all of the | |
1812 | * changes will be atomic. | |
1da177e4 | 1813 | */ |
3685c2a1 | 1814 | spin_lock(&mp->m_sb_lock); |
45c51b99 | 1815 | for (msbp = msb; msbp < (msb + nmsb); msbp++) { |
1b040712 CH |
1816 | ASSERT(msbp->msb_field < XFS_SBS_ICOUNT || |
1817 | msbp->msb_field > XFS_SBS_FDBLOCKS); | |
8d280b98 | 1818 | |
1b040712 CH |
1819 | error = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field, |
1820 | msbp->msb_delta, rsvd); | |
1821 | if (error) | |
1822 | goto unwind; | |
1da177e4 | 1823 | } |
1b040712 CH |
1824 | spin_unlock(&mp->m_sb_lock); |
1825 | return 0; | |
1da177e4 | 1826 | |
1b040712 CH |
1827 | unwind: |
1828 | while (--msbp >= msb) { | |
1829 | error = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field, | |
1830 | -msbp->msb_delta, rsvd); | |
1831 | ASSERT(error == 0); | |
1da177e4 | 1832 | } |
3685c2a1 | 1833 | spin_unlock(&mp->m_sb_lock); |
1b040712 | 1834 | return error; |
1da177e4 LT |
1835 | } |
1836 | ||
1837 | /* | |
1838 | * xfs_getsb() is called to obtain the buffer for the superblock. | |
1839 | * The buffer is returned locked and read in from disk. | |
1840 | * The buffer should be released with a call to xfs_brelse(). | |
1841 | * | |
1842 | * If the flags parameter is BUF_TRYLOCK, then we'll only return | |
1843 | * the superblock buffer if it can be locked without sleeping. | |
1844 | * If it can't then we'll return NULL. | |
1845 | */ | |
0c842ad4 | 1846 | struct xfs_buf * |
1da177e4 | 1847 | xfs_getsb( |
0c842ad4 CH |
1848 | struct xfs_mount *mp, |
1849 | int flags) | |
1da177e4 | 1850 | { |
0c842ad4 | 1851 | struct xfs_buf *bp = mp->m_sb_bp; |
1da177e4 | 1852 | |
0c842ad4 CH |
1853 | if (!xfs_buf_trylock(bp)) { |
1854 | if (flags & XBF_TRYLOCK) | |
1da177e4 | 1855 | return NULL; |
0c842ad4 | 1856 | xfs_buf_lock(bp); |
1da177e4 | 1857 | } |
0c842ad4 | 1858 | |
72790aa1 | 1859 | xfs_buf_hold(bp); |
1da177e4 | 1860 | ASSERT(XFS_BUF_ISDONE(bp)); |
014c2544 | 1861 | return bp; |
1da177e4 LT |
1862 | } |
1863 | ||
1864 | /* | |
1865 | * Used to free the superblock along various error paths. | |
1866 | */ | |
1867 | void | |
1868 | xfs_freesb( | |
26af6552 | 1869 | struct xfs_mount *mp) |
1da177e4 | 1870 | { |
26af6552 | 1871 | struct xfs_buf *bp = mp->m_sb_bp; |
1da177e4 | 1872 | |
26af6552 | 1873 | xfs_buf_lock(bp); |
1da177e4 | 1874 | mp->m_sb_bp = NULL; |
26af6552 | 1875 | xfs_buf_relse(bp); |
1da177e4 LT |
1876 | } |
1877 | ||
1da177e4 LT |
1878 | /* |
1879 | * Used to log changes to the superblock unit and width fields which could | |
e6957ea4 ES |
1880 | * be altered by the mount options, as well as any potential sb_features2 |
1881 | * fixup. Only the first superblock is updated. | |
1da177e4 | 1882 | */ |
7884bc86 | 1883 | int |
ee1c0908 | 1884 | xfs_mount_log_sb( |
1da177e4 LT |
1885 | xfs_mount_t *mp, |
1886 | __int64_t fields) | |
1887 | { | |
1888 | xfs_trans_t *tp; | |
e5720eec | 1889 | int error; |
1da177e4 | 1890 | |
ee1c0908 | 1891 | ASSERT(fields & (XFS_SB_UNIT | XFS_SB_WIDTH | XFS_SB_UUID | |
4b166de0 DC |
1892 | XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2 | |
1893 | XFS_SB_VERSIONNUM)); | |
1da177e4 LT |
1894 | |
1895 | tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT); | |
e5720eec DC |
1896 | error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, |
1897 | XFS_DEFAULT_LOG_COUNT); | |
1898 | if (error) { | |
1da177e4 | 1899 | xfs_trans_cancel(tp, 0); |
e5720eec | 1900 | return error; |
1da177e4 LT |
1901 | } |
1902 | xfs_mod_sb(tp, fields); | |
e5720eec DC |
1903 | error = xfs_trans_commit(tp, 0); |
1904 | return error; | |
1da177e4 | 1905 | } |
8d280b98 | 1906 | |
dda35b8f CH |
1907 | /* |
1908 | * If the underlying (data/log/rt) device is readonly, there are some | |
1909 | * operations that cannot proceed. | |
1910 | */ | |
1911 | int | |
1912 | xfs_dev_is_read_only( | |
1913 | struct xfs_mount *mp, | |
1914 | char *message) | |
1915 | { | |
1916 | if (xfs_readonly_buftarg(mp->m_ddev_targp) || | |
1917 | xfs_readonly_buftarg(mp->m_logdev_targp) || | |
1918 | (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) { | |
0b932ccc DC |
1919 | xfs_notice(mp, "%s required on read-only device.", message); |
1920 | xfs_notice(mp, "write access unavailable, cannot proceed."); | |
dda35b8f CH |
1921 | return EROFS; |
1922 | } | |
1923 | return 0; | |
1924 | } | |
8d280b98 DC |
1925 | |
1926 | #ifdef HAVE_PERCPU_SB | |
1927 | /* | |
1928 | * Per-cpu incore superblock counters | |
1929 | * | |
1930 | * Simple concept, difficult implementation | |
1931 | * | |
1932 | * Basically, replace the incore superblock counters with a distributed per cpu | |
1933 | * counter for contended fields (e.g. free block count). | |
1934 | * | |
1935 | * Difficulties arise in that the incore sb is used for ENOSPC checking, and | |
1936 | * hence needs to be accurately read when we are running low on space. Hence | |
1937 | * there is a method to enable and disable the per-cpu counters based on how | |
1938 | * much "stuff" is available in them. | |
1939 | * | |
1940 | * Basically, a counter is enabled if there is enough free resource to justify | |
1941 | * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local | |
1942 | * ENOSPC), then we disable the counters to synchronise all callers and | |
1943 | * re-distribute the available resources. | |
1944 | * | |
1945 | * If, once we redistributed the available resources, we still get a failure, | |
1946 | * we disable the per-cpu counter and go through the slow path. | |
1947 | * | |
1948 | * The slow path is the current xfs_mod_incore_sb() function. This means that | |
9da096fd | 1949 | * when we disable a per-cpu counter, we need to drain its resources back to |
8d280b98 DC |
1950 | * the global superblock. We do this after disabling the counter to prevent |
1951 | * more threads from queueing up on the counter. | |
1952 | * | |
1953 | * Essentially, this means that we still need a lock in the fast path to enable | |
1954 | * synchronisation between the global counters and the per-cpu counters. This | |
1955 | * is not a problem because the lock will be local to a CPU almost all the time | |
1956 | * and have little contention except when we get to ENOSPC conditions. | |
1957 | * | |
1958 | * Basically, this lock becomes a barrier that enables us to lock out the fast | |
1959 | * path while we do things like enabling and disabling counters and | |
1960 | * synchronising the counters. | |
1961 | * | |
1962 | * Locking rules: | |
1963 | * | |
3685c2a1 | 1964 | * 1. m_sb_lock before picking up per-cpu locks |
8d280b98 | 1965 | * 2. per-cpu locks always picked up via for_each_online_cpu() order |
3685c2a1 | 1966 | * 3. accurate counter sync requires m_sb_lock + per cpu locks |
8d280b98 | 1967 | * 4. modifying per-cpu counters requires holding per-cpu lock |
3685c2a1 ES |
1968 | * 5. modifying global counters requires holding m_sb_lock |
1969 | * 6. enabling or disabling a counter requires holding the m_sb_lock | |
8d280b98 DC |
1970 | * and _none_ of the per-cpu locks. |
1971 | * | |
1972 | * Disabled counters are only ever re-enabled by a balance operation | |
1973 | * that results in more free resources per CPU than a given threshold. | |
1974 | * To ensure counters don't remain disabled, they are rebalanced when | |
1975 | * the global resource goes above a higher threshold (i.e. some hysteresis | |
1976 | * is present to prevent thrashing). | |
e8234a68 DC |
1977 | */ |
1978 | ||
5a67e4c5 | 1979 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
1980 | /* |
1981 | * hot-plug CPU notifier support. | |
8d280b98 | 1982 | * |
5a67e4c5 CS |
1983 | * We need a notifier per filesystem as we need to be able to identify |
1984 | * the filesystem to balance the counters out. This is achieved by | |
1985 | * having a notifier block embedded in the xfs_mount_t and doing pointer | |
1986 | * magic to get the mount pointer from the notifier block address. | |
8d280b98 | 1987 | */ |
e8234a68 DC |
1988 | STATIC int |
1989 | xfs_icsb_cpu_notify( | |
1990 | struct notifier_block *nfb, | |
1991 | unsigned long action, | |
1992 | void *hcpu) | |
1993 | { | |
1994 | xfs_icsb_cnts_t *cntp; | |
1995 | xfs_mount_t *mp; | |
e8234a68 DC |
1996 | |
1997 | mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier); | |
1998 | cntp = (xfs_icsb_cnts_t *) | |
1999 | per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu); | |
2000 | switch (action) { | |
2001 | case CPU_UP_PREPARE: | |
8bb78442 | 2002 | case CPU_UP_PREPARE_FROZEN: |
e8234a68 DC |
2003 | /* Easy Case - initialize the area and locks, and |
2004 | * then rebalance when online does everything else for us. */ | |
01e1b69c | 2005 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 DC |
2006 | break; |
2007 | case CPU_ONLINE: | |
8bb78442 | 2008 | case CPU_ONLINE_FROZEN: |
03135cf7 | 2009 | xfs_icsb_lock(mp); |
45af6c6d CH |
2010 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0); |
2011 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0); | |
2012 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0); | |
03135cf7 | 2013 | xfs_icsb_unlock(mp); |
e8234a68 DC |
2014 | break; |
2015 | case CPU_DEAD: | |
8bb78442 | 2016 | case CPU_DEAD_FROZEN: |
e8234a68 DC |
2017 | /* Disable all the counters, then fold the dead cpu's |
2018 | * count into the total on the global superblock and | |
2019 | * re-enable the counters. */ | |
03135cf7 | 2020 | xfs_icsb_lock(mp); |
3685c2a1 | 2021 | spin_lock(&mp->m_sb_lock); |
e8234a68 DC |
2022 | xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT); |
2023 | xfs_icsb_disable_counter(mp, XFS_SBS_IFREE); | |
2024 | xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS); | |
2025 | ||
2026 | mp->m_sb.sb_icount += cntp->icsb_icount; | |
2027 | mp->m_sb.sb_ifree += cntp->icsb_ifree; | |
2028 | mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks; | |
2029 | ||
01e1b69c | 2030 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 | 2031 | |
45af6c6d CH |
2032 | xfs_icsb_balance_counter_locked(mp, XFS_SBS_ICOUNT, 0); |
2033 | xfs_icsb_balance_counter_locked(mp, XFS_SBS_IFREE, 0); | |
2034 | xfs_icsb_balance_counter_locked(mp, XFS_SBS_FDBLOCKS, 0); | |
3685c2a1 | 2035 | spin_unlock(&mp->m_sb_lock); |
03135cf7 | 2036 | xfs_icsb_unlock(mp); |
e8234a68 DC |
2037 | break; |
2038 | } | |
2039 | ||
2040 | return NOTIFY_OK; | |
2041 | } | |
5a67e4c5 | 2042 | #endif /* CONFIG_HOTPLUG_CPU */ |
e8234a68 | 2043 | |
8d280b98 DC |
2044 | int |
2045 | xfs_icsb_init_counters( | |
2046 | xfs_mount_t *mp) | |
2047 | { | |
2048 | xfs_icsb_cnts_t *cntp; | |
2049 | int i; | |
2050 | ||
2051 | mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t); | |
2052 | if (mp->m_sb_cnts == NULL) | |
2053 | return -ENOMEM; | |
2054 | ||
5a67e4c5 | 2055 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
2056 | mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify; |
2057 | mp->m_icsb_notifier.priority = 0; | |
5a67e4c5 CS |
2058 | register_hotcpu_notifier(&mp->m_icsb_notifier); |
2059 | #endif /* CONFIG_HOTPLUG_CPU */ | |
e8234a68 | 2060 | |
8d280b98 DC |
2061 | for_each_online_cpu(i) { |
2062 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2063 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
8d280b98 | 2064 | } |
20b64285 DC |
2065 | |
2066 | mutex_init(&mp->m_icsb_mutex); | |
2067 | ||
8d280b98 DC |
2068 | /* |
2069 | * start with all counters disabled so that the | |
2070 | * initial balance kicks us off correctly | |
2071 | */ | |
2072 | mp->m_icsb_counters = -1; | |
2073 | return 0; | |
2074 | } | |
2075 | ||
5478eead LM |
2076 | void |
2077 | xfs_icsb_reinit_counters( | |
2078 | xfs_mount_t *mp) | |
2079 | { | |
2080 | xfs_icsb_lock(mp); | |
2081 | /* | |
2082 | * start with all counters disabled so that the | |
2083 | * initial balance kicks us off correctly | |
2084 | */ | |
2085 | mp->m_icsb_counters = -1; | |
45af6c6d CH |
2086 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0); |
2087 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0); | |
2088 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0); | |
5478eead LM |
2089 | xfs_icsb_unlock(mp); |
2090 | } | |
2091 | ||
c962fb79 | 2092 | void |
8d280b98 DC |
2093 | xfs_icsb_destroy_counters( |
2094 | xfs_mount_t *mp) | |
2095 | { | |
e8234a68 | 2096 | if (mp->m_sb_cnts) { |
5a67e4c5 | 2097 | unregister_hotcpu_notifier(&mp->m_icsb_notifier); |
8d280b98 | 2098 | free_percpu(mp->m_sb_cnts); |
e8234a68 | 2099 | } |
03135cf7 | 2100 | mutex_destroy(&mp->m_icsb_mutex); |
8d280b98 DC |
2101 | } |
2102 | ||
b8f82a4a | 2103 | STATIC void |
01e1b69c DC |
2104 | xfs_icsb_lock_cntr( |
2105 | xfs_icsb_cnts_t *icsbp) | |
2106 | { | |
2107 | while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) { | |
2108 | ndelay(1000); | |
2109 | } | |
2110 | } | |
2111 | ||
b8f82a4a | 2112 | STATIC void |
01e1b69c DC |
2113 | xfs_icsb_unlock_cntr( |
2114 | xfs_icsb_cnts_t *icsbp) | |
2115 | { | |
2116 | clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags); | |
2117 | } | |
2118 | ||
8d280b98 | 2119 | |
b8f82a4a | 2120 | STATIC void |
8d280b98 DC |
2121 | xfs_icsb_lock_all_counters( |
2122 | xfs_mount_t *mp) | |
2123 | { | |
2124 | xfs_icsb_cnts_t *cntp; | |
2125 | int i; | |
2126 | ||
2127 | for_each_online_cpu(i) { | |
2128 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2129 | xfs_icsb_lock_cntr(cntp); |
8d280b98 DC |
2130 | } |
2131 | } | |
2132 | ||
b8f82a4a | 2133 | STATIC void |
8d280b98 DC |
2134 | xfs_icsb_unlock_all_counters( |
2135 | xfs_mount_t *mp) | |
2136 | { | |
2137 | xfs_icsb_cnts_t *cntp; | |
2138 | int i; | |
2139 | ||
2140 | for_each_online_cpu(i) { | |
2141 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2142 | xfs_icsb_unlock_cntr(cntp); |
8d280b98 DC |
2143 | } |
2144 | } | |
2145 | ||
2146 | STATIC void | |
2147 | xfs_icsb_count( | |
2148 | xfs_mount_t *mp, | |
2149 | xfs_icsb_cnts_t *cnt, | |
2150 | int flags) | |
2151 | { | |
2152 | xfs_icsb_cnts_t *cntp; | |
2153 | int i; | |
2154 | ||
2155 | memset(cnt, 0, sizeof(xfs_icsb_cnts_t)); | |
2156 | ||
2157 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
2158 | xfs_icsb_lock_all_counters(mp); | |
2159 | ||
2160 | for_each_online_cpu(i) { | |
2161 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
2162 | cnt->icsb_icount += cntp->icsb_icount; | |
2163 | cnt->icsb_ifree += cntp->icsb_ifree; | |
2164 | cnt->icsb_fdblocks += cntp->icsb_fdblocks; | |
2165 | } | |
2166 | ||
2167 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
2168 | xfs_icsb_unlock_all_counters(mp); | |
2169 | } | |
2170 | ||
2171 | STATIC int | |
2172 | xfs_icsb_counter_disabled( | |
2173 | xfs_mount_t *mp, | |
2174 | xfs_sb_field_t field) | |
2175 | { | |
2176 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2177 | return test_bit(field, &mp->m_icsb_counters); | |
2178 | } | |
2179 | ||
36fbe6e6 | 2180 | STATIC void |
8d280b98 DC |
2181 | xfs_icsb_disable_counter( |
2182 | xfs_mount_t *mp, | |
2183 | xfs_sb_field_t field) | |
2184 | { | |
2185 | xfs_icsb_cnts_t cnt; | |
2186 | ||
2187 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2188 | ||
20b64285 DC |
2189 | /* |
2190 | * If we are already disabled, then there is nothing to do | |
2191 | * here. We check before locking all the counters to avoid | |
2192 | * the expensive lock operation when being called in the | |
2193 | * slow path and the counter is already disabled. This is | |
2194 | * safe because the only time we set or clear this state is under | |
2195 | * the m_icsb_mutex. | |
2196 | */ | |
2197 | if (xfs_icsb_counter_disabled(mp, field)) | |
36fbe6e6 | 2198 | return; |
20b64285 | 2199 | |
8d280b98 DC |
2200 | xfs_icsb_lock_all_counters(mp); |
2201 | if (!test_and_set_bit(field, &mp->m_icsb_counters)) { | |
2202 | /* drain back to superblock */ | |
2203 | ||
ce46193b | 2204 | xfs_icsb_count(mp, &cnt, XFS_ICSB_LAZY_COUNT); |
8d280b98 DC |
2205 | switch(field) { |
2206 | case XFS_SBS_ICOUNT: | |
2207 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
2208 | break; | |
2209 | case XFS_SBS_IFREE: | |
2210 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
2211 | break; | |
2212 | case XFS_SBS_FDBLOCKS: | |
2213 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
2214 | break; | |
2215 | default: | |
2216 | BUG(); | |
2217 | } | |
2218 | } | |
2219 | ||
2220 | xfs_icsb_unlock_all_counters(mp); | |
8d280b98 DC |
2221 | } |
2222 | ||
2223 | STATIC void | |
2224 | xfs_icsb_enable_counter( | |
2225 | xfs_mount_t *mp, | |
2226 | xfs_sb_field_t field, | |
2227 | uint64_t count, | |
2228 | uint64_t resid) | |
2229 | { | |
2230 | xfs_icsb_cnts_t *cntp; | |
2231 | int i; | |
2232 | ||
2233 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2234 | ||
2235 | xfs_icsb_lock_all_counters(mp); | |
2236 | for_each_online_cpu(i) { | |
2237 | cntp = per_cpu_ptr(mp->m_sb_cnts, i); | |
2238 | switch (field) { | |
2239 | case XFS_SBS_ICOUNT: | |
2240 | cntp->icsb_icount = count + resid; | |
2241 | break; | |
2242 | case XFS_SBS_IFREE: | |
2243 | cntp->icsb_ifree = count + resid; | |
2244 | break; | |
2245 | case XFS_SBS_FDBLOCKS: | |
2246 | cntp->icsb_fdblocks = count + resid; | |
2247 | break; | |
2248 | default: | |
2249 | BUG(); | |
2250 | break; | |
2251 | } | |
2252 | resid = 0; | |
2253 | } | |
2254 | clear_bit(field, &mp->m_icsb_counters); | |
2255 | xfs_icsb_unlock_all_counters(mp); | |
2256 | } | |
2257 | ||
dbcabad1 | 2258 | void |
d4d90b57 | 2259 | xfs_icsb_sync_counters_locked( |
8d280b98 DC |
2260 | xfs_mount_t *mp, |
2261 | int flags) | |
2262 | { | |
2263 | xfs_icsb_cnts_t cnt; | |
8d280b98 | 2264 | |
8d280b98 DC |
2265 | xfs_icsb_count(mp, &cnt, flags); |
2266 | ||
8d280b98 DC |
2267 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT)) |
2268 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
2269 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE)) | |
2270 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
2271 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS)) | |
2272 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
8d280b98 DC |
2273 | } |
2274 | ||
2275 | /* | |
2276 | * Accurate update of per-cpu counters to incore superblock | |
2277 | */ | |
d4d90b57 | 2278 | void |
8d280b98 | 2279 | xfs_icsb_sync_counters( |
d4d90b57 CH |
2280 | xfs_mount_t *mp, |
2281 | int flags) | |
8d280b98 | 2282 | { |
d4d90b57 CH |
2283 | spin_lock(&mp->m_sb_lock); |
2284 | xfs_icsb_sync_counters_locked(mp, flags); | |
2285 | spin_unlock(&mp->m_sb_lock); | |
8d280b98 DC |
2286 | } |
2287 | ||
2288 | /* | |
2289 | * Balance and enable/disable counters as necessary. | |
2290 | * | |
20b64285 DC |
2291 | * Thresholds for re-enabling counters are somewhat magic. inode counts are |
2292 | * chosen to be the same number as single on disk allocation chunk per CPU, and | |
2293 | * free blocks is something far enough zero that we aren't going thrash when we | |
2294 | * get near ENOSPC. We also need to supply a minimum we require per cpu to | |
2295 | * prevent looping endlessly when xfs_alloc_space asks for more than will | |
2296 | * be distributed to a single CPU but each CPU has enough blocks to be | |
2297 | * reenabled. | |
2298 | * | |
2299 | * Note that we can be called when counters are already disabled. | |
2300 | * xfs_icsb_disable_counter() optimises the counter locking in this case to | |
2301 | * prevent locking every per-cpu counter needlessly. | |
8d280b98 | 2302 | */ |
20b64285 DC |
2303 | |
2304 | #define XFS_ICSB_INO_CNTR_REENABLE (uint64_t)64 | |
4be536de | 2305 | #define XFS_ICSB_FDBLK_CNTR_REENABLE(mp) \ |
20b64285 | 2306 | (uint64_t)(512 + XFS_ALLOC_SET_ASIDE(mp)) |
8d280b98 | 2307 | STATIC void |
45af6c6d | 2308 | xfs_icsb_balance_counter_locked( |
8d280b98 DC |
2309 | xfs_mount_t *mp, |
2310 | xfs_sb_field_t field, | |
20b64285 | 2311 | int min_per_cpu) |
8d280b98 | 2312 | { |
6fdf8ccc | 2313 | uint64_t count, resid; |
8d280b98 | 2314 | int weight = num_online_cpus(); |
20b64285 | 2315 | uint64_t min = (uint64_t)min_per_cpu; |
8d280b98 | 2316 | |
8d280b98 DC |
2317 | /* disable counter and sync counter */ |
2318 | xfs_icsb_disable_counter(mp, field); | |
2319 | ||
2320 | /* update counters - first CPU gets residual*/ | |
2321 | switch (field) { | |
2322 | case XFS_SBS_ICOUNT: | |
2323 | count = mp->m_sb.sb_icount; | |
2324 | resid = do_div(count, weight); | |
20b64285 | 2325 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
45af6c6d | 2326 | return; |
8d280b98 DC |
2327 | break; |
2328 | case XFS_SBS_IFREE: | |
2329 | count = mp->m_sb.sb_ifree; | |
2330 | resid = do_div(count, weight); | |
20b64285 | 2331 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
45af6c6d | 2332 | return; |
8d280b98 DC |
2333 | break; |
2334 | case XFS_SBS_FDBLOCKS: | |
2335 | count = mp->m_sb.sb_fdblocks; | |
2336 | resid = do_div(count, weight); | |
20b64285 | 2337 | if (count < max(min, XFS_ICSB_FDBLK_CNTR_REENABLE(mp))) |
45af6c6d | 2338 | return; |
8d280b98 DC |
2339 | break; |
2340 | default: | |
2341 | BUG(); | |
6fdf8ccc | 2342 | count = resid = 0; /* quiet, gcc */ |
8d280b98 DC |
2343 | break; |
2344 | } | |
2345 | ||
2346 | xfs_icsb_enable_counter(mp, field, count, resid); | |
45af6c6d CH |
2347 | } |
2348 | ||
2349 | STATIC void | |
2350 | xfs_icsb_balance_counter( | |
2351 | xfs_mount_t *mp, | |
2352 | xfs_sb_field_t fields, | |
2353 | int min_per_cpu) | |
2354 | { | |
2355 | spin_lock(&mp->m_sb_lock); | |
2356 | xfs_icsb_balance_counter_locked(mp, fields, min_per_cpu); | |
2357 | spin_unlock(&mp->m_sb_lock); | |
8d280b98 DC |
2358 | } |
2359 | ||
1b040712 | 2360 | int |
20b64285 | 2361 | xfs_icsb_modify_counters( |
8d280b98 DC |
2362 | xfs_mount_t *mp, |
2363 | xfs_sb_field_t field, | |
20f4ebf2 | 2364 | int64_t delta, |
20b64285 | 2365 | int rsvd) |
8d280b98 DC |
2366 | { |
2367 | xfs_icsb_cnts_t *icsbp; | |
2368 | long long lcounter; /* long counter for 64 bit fields */ | |
7a9e02d6 | 2369 | int ret = 0; |
8d280b98 | 2370 | |
20b64285 | 2371 | might_sleep(); |
8d280b98 | 2372 | again: |
7a9e02d6 CL |
2373 | preempt_disable(); |
2374 | icsbp = this_cpu_ptr(mp->m_sb_cnts); | |
20b64285 DC |
2375 | |
2376 | /* | |
2377 | * if the counter is disabled, go to slow path | |
2378 | */ | |
8d280b98 DC |
2379 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) |
2380 | goto slow_path; | |
20b64285 DC |
2381 | xfs_icsb_lock_cntr(icsbp); |
2382 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) { | |
2383 | xfs_icsb_unlock_cntr(icsbp); | |
2384 | goto slow_path; | |
2385 | } | |
8d280b98 DC |
2386 | |
2387 | switch (field) { | |
2388 | case XFS_SBS_ICOUNT: | |
2389 | lcounter = icsbp->icsb_icount; | |
2390 | lcounter += delta; | |
2391 | if (unlikely(lcounter < 0)) | |
20b64285 | 2392 | goto balance_counter; |
8d280b98 DC |
2393 | icsbp->icsb_icount = lcounter; |
2394 | break; | |
2395 | ||
2396 | case XFS_SBS_IFREE: | |
2397 | lcounter = icsbp->icsb_ifree; | |
2398 | lcounter += delta; | |
2399 | if (unlikely(lcounter < 0)) | |
20b64285 | 2400 | goto balance_counter; |
8d280b98 DC |
2401 | icsbp->icsb_ifree = lcounter; |
2402 | break; | |
2403 | ||
2404 | case XFS_SBS_FDBLOCKS: | |
2405 | BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0); | |
2406 | ||
4be536de | 2407 | lcounter = icsbp->icsb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2408 | lcounter += delta; |
2409 | if (unlikely(lcounter < 0)) | |
20b64285 | 2410 | goto balance_counter; |
4be536de | 2411 | icsbp->icsb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2412 | break; |
2413 | default: | |
2414 | BUG(); | |
2415 | break; | |
2416 | } | |
01e1b69c | 2417 | xfs_icsb_unlock_cntr(icsbp); |
7a9e02d6 | 2418 | preempt_enable(); |
8d280b98 DC |
2419 | return 0; |
2420 | ||
8d280b98 | 2421 | slow_path: |
7a9e02d6 | 2422 | preempt_enable(); |
8d280b98 | 2423 | |
20b64285 DC |
2424 | /* |
2425 | * serialise with a mutex so we don't burn lots of cpu on | |
2426 | * the superblock lock. We still need to hold the superblock | |
2427 | * lock, however, when we modify the global structures. | |
2428 | */ | |
03135cf7 | 2429 | xfs_icsb_lock(mp); |
20b64285 DC |
2430 | |
2431 | /* | |
2432 | * Now running atomically. | |
2433 | * | |
2434 | * If the counter is enabled, someone has beaten us to rebalancing. | |
2435 | * Drop the lock and try again in the fast path.... | |
2436 | */ | |
2437 | if (!(xfs_icsb_counter_disabled(mp, field))) { | |
03135cf7 | 2438 | xfs_icsb_unlock(mp); |
8d280b98 | 2439 | goto again; |
8d280b98 DC |
2440 | } |
2441 | ||
20b64285 DC |
2442 | /* |
2443 | * The counter is currently disabled. Because we are | |
2444 | * running atomically here, we know a rebalance cannot | |
2445 | * be in progress. Hence we can go straight to operating | |
2446 | * on the global superblock. We do not call xfs_mod_incore_sb() | |
3685c2a1 | 2447 | * here even though we need to get the m_sb_lock. Doing so |
20b64285 | 2448 | * will cause us to re-enter this function and deadlock. |
3685c2a1 | 2449 | * Hence we get the m_sb_lock ourselves and then call |
20b64285 DC |
2450 | * xfs_mod_incore_sb_unlocked() as the unlocked path operates |
2451 | * directly on the global counters. | |
2452 | */ | |
3685c2a1 | 2453 | spin_lock(&mp->m_sb_lock); |
8d280b98 | 2454 | ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); |
3685c2a1 | 2455 | spin_unlock(&mp->m_sb_lock); |
8d280b98 | 2456 | |
20b64285 DC |
2457 | /* |
2458 | * Now that we've modified the global superblock, we | |
2459 | * may be able to re-enable the distributed counters | |
2460 | * (e.g. lots of space just got freed). After that | |
2461 | * we are done. | |
2462 | */ | |
2463 | if (ret != ENOSPC) | |
45af6c6d | 2464 | xfs_icsb_balance_counter(mp, field, 0); |
03135cf7 | 2465 | xfs_icsb_unlock(mp); |
8d280b98 | 2466 | return ret; |
8d280b98 | 2467 | |
20b64285 DC |
2468 | balance_counter: |
2469 | xfs_icsb_unlock_cntr(icsbp); | |
7a9e02d6 | 2470 | preempt_enable(); |
8d280b98 | 2471 | |
20b64285 DC |
2472 | /* |
2473 | * We may have multiple threads here if multiple per-cpu | |
2474 | * counters run dry at the same time. This will mean we can | |
2475 | * do more balances than strictly necessary but it is not | |
2476 | * the common slowpath case. | |
2477 | */ | |
03135cf7 | 2478 | xfs_icsb_lock(mp); |
20b64285 DC |
2479 | |
2480 | /* | |
2481 | * running atomically. | |
2482 | * | |
2483 | * This will leave the counter in the correct state for future | |
2484 | * accesses. After the rebalance, we simply try again and our retry | |
2485 | * will either succeed through the fast path or slow path without | |
2486 | * another balance operation being required. | |
2487 | */ | |
45af6c6d | 2488 | xfs_icsb_balance_counter(mp, field, delta); |
03135cf7 | 2489 | xfs_icsb_unlock(mp); |
20b64285 | 2490 | goto again; |
8d280b98 | 2491 | } |
20b64285 | 2492 | |
8d280b98 | 2493 | #endif |