Commit | Line | Data |
---|---|---|
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" |
70a9883c | 20 | #include "xfs_shared.h" |
239880ef DC |
21 | #include "xfs_format.h" |
22 | #include "xfs_log_format.h" | |
23 | #include "xfs_trans_resv.h" | |
a844f451 | 24 | #include "xfs_bit.h" |
a844f451 | 25 | #include "xfs_inum.h" |
1da177e4 LT |
26 | #include "xfs_sb.h" |
27 | #include "xfs_ag.h" | |
1da177e4 | 28 | #include "xfs_mount.h" |
57062787 | 29 | #include "xfs_da_format.h" |
1da177e4 | 30 | #include "xfs_inode.h" |
a4fbe6ab | 31 | #include "xfs_dir2.h" |
a844f451 | 32 | #include "xfs_ialloc.h" |
1da177e4 LT |
33 | #include "xfs_alloc.h" |
34 | #include "xfs_rtalloc.h" | |
35 | #include "xfs_bmap.h" | |
a4fbe6ab DC |
36 | #include "xfs_trans.h" |
37 | #include "xfs_trans_priv.h" | |
38 | #include "xfs_log.h" | |
1da177e4 | 39 | #include "xfs_error.h" |
1da177e4 LT |
40 | #include "xfs_quota.h" |
41 | #include "xfs_fsops.h" | |
0b1b213f | 42 | #include "xfs_trace.h" |
6d8b79cf | 43 | #include "xfs_icache.h" |
8f80587b | 44 | #include "xfs_dinode.h" |
a31b1d3d | 45 | #include "xfs_sysfs.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 | ||
27174203 CH |
60 | static DEFINE_MUTEX(xfs_uuid_table_mutex); |
61 | static int xfs_uuid_table_size; | |
62 | static uuid_t *xfs_uuid_table; | |
63 | ||
64 | /* | |
65 | * See if the UUID is unique among mounted XFS filesystems. | |
66 | * Mount fails if UUID is nil or a FS with the same UUID is already mounted. | |
67 | */ | |
68 | STATIC int | |
69 | xfs_uuid_mount( | |
70 | struct xfs_mount *mp) | |
71 | { | |
72 | uuid_t *uuid = &mp->m_sb.sb_uuid; | |
73 | int hole, i; | |
74 | ||
75 | if (mp->m_flags & XFS_MOUNT_NOUUID) | |
76 | return 0; | |
77 | ||
78 | if (uuid_is_nil(uuid)) { | |
0b932ccc | 79 | xfs_warn(mp, "Filesystem has nil UUID - can't mount"); |
2451337d | 80 | return -EINVAL; |
27174203 CH |
81 | } |
82 | ||
83 | mutex_lock(&xfs_uuid_table_mutex); | |
84 | for (i = 0, hole = -1; i < xfs_uuid_table_size; i++) { | |
85 | if (uuid_is_nil(&xfs_uuid_table[i])) { | |
86 | hole = i; | |
87 | continue; | |
88 | } | |
89 | if (uuid_equal(uuid, &xfs_uuid_table[i])) | |
90 | goto out_duplicate; | |
91 | } | |
92 | ||
93 | if (hole < 0) { | |
94 | xfs_uuid_table = kmem_realloc(xfs_uuid_table, | |
95 | (xfs_uuid_table_size + 1) * sizeof(*xfs_uuid_table), | |
96 | xfs_uuid_table_size * sizeof(*xfs_uuid_table), | |
97 | KM_SLEEP); | |
98 | hole = xfs_uuid_table_size++; | |
99 | } | |
100 | xfs_uuid_table[hole] = *uuid; | |
101 | mutex_unlock(&xfs_uuid_table_mutex); | |
102 | ||
103 | return 0; | |
104 | ||
105 | out_duplicate: | |
106 | mutex_unlock(&xfs_uuid_table_mutex); | |
021000e5 | 107 | xfs_warn(mp, "Filesystem has duplicate UUID %pU - can't mount", uuid); |
2451337d | 108 | return -EINVAL; |
27174203 CH |
109 | } |
110 | ||
111 | STATIC void | |
112 | xfs_uuid_unmount( | |
113 | struct xfs_mount *mp) | |
114 | { | |
115 | uuid_t *uuid = &mp->m_sb.sb_uuid; | |
116 | int i; | |
117 | ||
118 | if (mp->m_flags & XFS_MOUNT_NOUUID) | |
119 | return; | |
120 | ||
121 | mutex_lock(&xfs_uuid_table_mutex); | |
122 | for (i = 0; i < xfs_uuid_table_size; i++) { | |
123 | if (uuid_is_nil(&xfs_uuid_table[i])) | |
124 | continue; | |
125 | if (!uuid_equal(uuid, &xfs_uuid_table[i])) | |
126 | continue; | |
127 | memset(&xfs_uuid_table[i], 0, sizeof(uuid_t)); | |
128 | break; | |
129 | } | |
130 | ASSERT(i < xfs_uuid_table_size); | |
131 | mutex_unlock(&xfs_uuid_table_mutex); | |
132 | } | |
133 | ||
134 | ||
e176579e DC |
135 | STATIC void |
136 | __xfs_free_perag( | |
137 | struct rcu_head *head) | |
138 | { | |
139 | struct xfs_perag *pag = container_of(head, struct xfs_perag, rcu_head); | |
140 | ||
141 | ASSERT(atomic_read(&pag->pag_ref) == 0); | |
142 | kmem_free(pag); | |
143 | } | |
144 | ||
1da177e4 | 145 | /* |
e176579e | 146 | * Free up the per-ag resources associated with the mount structure. |
1da177e4 | 147 | */ |
c962fb79 | 148 | STATIC void |
ff4f038c | 149 | xfs_free_perag( |
745f6919 | 150 | xfs_mount_t *mp) |
1da177e4 | 151 | { |
1c1c6ebc DC |
152 | xfs_agnumber_t agno; |
153 | struct xfs_perag *pag; | |
154 | ||
155 | for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) { | |
156 | spin_lock(&mp->m_perag_lock); | |
157 | pag = radix_tree_delete(&mp->m_perag_tree, agno); | |
158 | spin_unlock(&mp->m_perag_lock); | |
e176579e | 159 | ASSERT(pag); |
f83282a8 | 160 | ASSERT(atomic_read(&pag->pag_ref) == 0); |
e176579e | 161 | call_rcu(&pag->rcu_head, __xfs_free_perag); |
1da177e4 | 162 | } |
1da177e4 LT |
163 | } |
164 | ||
4cc929ee NS |
165 | /* |
166 | * Check size of device based on the (data/realtime) block count. | |
167 | * Note: this check is used by the growfs code as well as mount. | |
168 | */ | |
169 | int | |
170 | xfs_sb_validate_fsb_count( | |
171 | xfs_sb_t *sbp, | |
172 | __uint64_t nblocks) | |
173 | { | |
174 | ASSERT(PAGE_SHIFT >= sbp->sb_blocklog); | |
175 | ASSERT(sbp->sb_blocklog >= BBSHIFT); | |
176 | ||
d5cf09ba | 177 | /* Limited by ULONG_MAX of page cache index */ |
4cc929ee | 178 | if (nblocks >> (PAGE_CACHE_SHIFT - sbp->sb_blocklog) > ULONG_MAX) |
2451337d | 179 | return -EFBIG; |
4cc929ee NS |
180 | return 0; |
181 | } | |
1da177e4 | 182 | |
1c1c6ebc | 183 | int |
c11e2c36 | 184 | xfs_initialize_perag( |
c11e2c36 | 185 | xfs_mount_t *mp, |
1c1c6ebc DC |
186 | xfs_agnumber_t agcount, |
187 | xfs_agnumber_t *maxagi) | |
1da177e4 | 188 | { |
2d2194f6 | 189 | xfs_agnumber_t index; |
8b26c582 | 190 | xfs_agnumber_t first_initialised = 0; |
1da177e4 LT |
191 | xfs_perag_t *pag; |
192 | xfs_agino_t agino; | |
193 | xfs_ino_t ino; | |
194 | xfs_sb_t *sbp = &mp->m_sb; | |
8b26c582 | 195 | int error = -ENOMEM; |
1da177e4 | 196 | |
1c1c6ebc DC |
197 | /* |
198 | * Walk the current per-ag tree so we don't try to initialise AGs | |
199 | * that already exist (growfs case). Allocate and insert all the | |
200 | * AGs we don't find ready for initialisation. | |
201 | */ | |
202 | for (index = 0; index < agcount; index++) { | |
203 | pag = xfs_perag_get(mp, index); | |
204 | if (pag) { | |
205 | xfs_perag_put(pag); | |
206 | continue; | |
207 | } | |
8b26c582 DC |
208 | if (!first_initialised) |
209 | first_initialised = index; | |
fb3b504a | 210 | |
1c1c6ebc DC |
211 | pag = kmem_zalloc(sizeof(*pag), KM_MAYFAIL); |
212 | if (!pag) | |
8b26c582 | 213 | goto out_unwind; |
fb3b504a CH |
214 | pag->pag_agno = index; |
215 | pag->pag_mount = mp; | |
1a427ab0 | 216 | spin_lock_init(&pag->pag_ici_lock); |
69b491c2 | 217 | mutex_init(&pag->pag_ici_reclaim_lock); |
fb3b504a | 218 | INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC); |
74f75a0c DC |
219 | spin_lock_init(&pag->pag_buf_lock); |
220 | pag->pag_buf_tree = RB_ROOT; | |
fb3b504a | 221 | |
1c1c6ebc | 222 | if (radix_tree_preload(GFP_NOFS)) |
8b26c582 | 223 | goto out_unwind; |
fb3b504a | 224 | |
1c1c6ebc DC |
225 | spin_lock(&mp->m_perag_lock); |
226 | if (radix_tree_insert(&mp->m_perag_tree, index, pag)) { | |
227 | BUG(); | |
228 | spin_unlock(&mp->m_perag_lock); | |
8b26c582 DC |
229 | radix_tree_preload_end(); |
230 | error = -EEXIST; | |
231 | goto out_unwind; | |
1c1c6ebc DC |
232 | } |
233 | spin_unlock(&mp->m_perag_lock); | |
234 | radix_tree_preload_end(); | |
235 | } | |
236 | ||
fb3b504a CH |
237 | /* |
238 | * If we mount with the inode64 option, or no inode overflows | |
239 | * the legacy 32-bit address space clear the inode32 option. | |
1da177e4 | 240 | */ |
fb3b504a CH |
241 | agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0); |
242 | ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino); | |
243 | ||
244 | if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32) | |
1da177e4 | 245 | mp->m_flags |= XFS_MOUNT_32BITINODES; |
fb3b504a | 246 | else |
1da177e4 | 247 | mp->m_flags &= ~XFS_MOUNT_32BITINODES; |
1da177e4 | 248 | |
2d2194f6 | 249 | if (mp->m_flags & XFS_MOUNT_32BITINODES) |
9de67c3b | 250 | index = xfs_set_inode32(mp, agcount); |
2d2194f6 | 251 | else |
9de67c3b | 252 | index = xfs_set_inode64(mp, agcount); |
fb3b504a | 253 | |
1c1c6ebc DC |
254 | if (maxagi) |
255 | *maxagi = index; | |
256 | return 0; | |
8b26c582 DC |
257 | |
258 | out_unwind: | |
259 | kmem_free(pag); | |
260 | for (; index > first_initialised; index--) { | |
261 | pag = radix_tree_delete(&mp->m_perag_tree, index); | |
262 | kmem_free(pag); | |
263 | } | |
264 | return error; | |
1da177e4 LT |
265 | } |
266 | ||
1da177e4 LT |
267 | /* |
268 | * xfs_readsb | |
269 | * | |
270 | * Does the initial read of the superblock. | |
271 | */ | |
272 | int | |
ff55068c DC |
273 | xfs_readsb( |
274 | struct xfs_mount *mp, | |
275 | int flags) | |
1da177e4 LT |
276 | { |
277 | unsigned int sector_size; | |
04a1e6c5 DC |
278 | struct xfs_buf *bp; |
279 | struct xfs_sb *sbp = &mp->m_sb; | |
1da177e4 | 280 | int error; |
af34e09d | 281 | int loud = !(flags & XFS_MFSI_QUIET); |
daba5427 | 282 | const struct xfs_buf_ops *buf_ops; |
1da177e4 LT |
283 | |
284 | ASSERT(mp->m_sb_bp == NULL); | |
285 | ASSERT(mp->m_ddev_targp != NULL); | |
286 | ||
daba5427 ES |
287 | /* |
288 | * For the initial read, we must guess at the sector | |
289 | * size based on the block device. It's enough to | |
290 | * get the sb_sectsize out of the superblock and | |
291 | * then reread with the proper length. | |
292 | * We don't verify it yet, because it may not be complete. | |
293 | */ | |
294 | sector_size = xfs_getsize_buftarg(mp->m_ddev_targp); | |
295 | buf_ops = NULL; | |
296 | ||
1da177e4 LT |
297 | /* |
298 | * Allocate a (locked) buffer to hold the superblock. | |
299 | * This will be kept around at all times to optimize | |
300 | * access to the superblock. | |
301 | */ | |
26af6552 | 302 | reread: |
ba372674 DC |
303 | error = xfs_buf_read_uncached(mp->m_ddev_targp, XFS_SB_DADDR, |
304 | BTOBB(sector_size), 0, &bp, buf_ops); | |
305 | if (error) { | |
eab4e633 | 306 | if (loud) |
e721f504 | 307 | xfs_warn(mp, "SB validate failed with error %d.", error); |
ac75a1f7 | 308 | /* bad CRC means corrupted metadata */ |
2451337d DC |
309 | if (error == -EFSBADCRC) |
310 | error = -EFSCORRUPTED; | |
ba372674 | 311 | return error; |
eab4e633 | 312 | } |
1da177e4 LT |
313 | |
314 | /* | |
315 | * Initialize the mount structure from the superblock. | |
1da177e4 | 316 | */ |
556b8883 | 317 | xfs_sb_from_disk(sbp, XFS_BUF_TO_SBP(bp)); |
556b8883 DC |
318 | |
319 | /* | |
320 | * If we haven't validated the superblock, do so now before we try | |
321 | * to check the sector size and reread the superblock appropriately. | |
322 | */ | |
323 | if (sbp->sb_magicnum != XFS_SB_MAGIC) { | |
324 | if (loud) | |
325 | xfs_warn(mp, "Invalid superblock magic number"); | |
2451337d | 326 | error = -EINVAL; |
556b8883 DC |
327 | goto release_buf; |
328 | } | |
ff55068c | 329 | |
1da177e4 LT |
330 | /* |
331 | * We must be able to do sector-sized and sector-aligned IO. | |
332 | */ | |
04a1e6c5 | 333 | if (sector_size > sbp->sb_sectsize) { |
af34e09d DC |
334 | if (loud) |
335 | xfs_warn(mp, "device supports %u byte sectors (not %u)", | |
04a1e6c5 | 336 | sector_size, sbp->sb_sectsize); |
2451337d | 337 | error = -ENOSYS; |
26af6552 | 338 | goto release_buf; |
1da177e4 LT |
339 | } |
340 | ||
daba5427 | 341 | if (buf_ops == NULL) { |
556b8883 DC |
342 | /* |
343 | * Re-read the superblock so the buffer is correctly sized, | |
344 | * and properly verified. | |
345 | */ | |
1da177e4 | 346 | xfs_buf_relse(bp); |
04a1e6c5 | 347 | sector_size = sbp->sb_sectsize; |
daba5427 | 348 | buf_ops = loud ? &xfs_sb_buf_ops : &xfs_sb_quiet_buf_ops; |
26af6552 | 349 | goto reread; |
1da177e4 LT |
350 | } |
351 | ||
5478eead LM |
352 | /* Initialize per-cpu counters */ |
353 | xfs_icsb_reinit_counters(mp); | |
8d280b98 | 354 | |
04a1e6c5 DC |
355 | /* no need to be quiet anymore, so reset the buf ops */ |
356 | bp->b_ops = &xfs_sb_buf_ops; | |
357 | ||
1da177e4 | 358 | mp->m_sb_bp = bp; |
26af6552 | 359 | xfs_buf_unlock(bp); |
1da177e4 LT |
360 | return 0; |
361 | ||
26af6552 DC |
362 | release_buf: |
363 | xfs_buf_relse(bp); | |
1da177e4 LT |
364 | return error; |
365 | } | |
366 | ||
1da177e4 | 367 | /* |
0771fb45 | 368 | * Update alignment values based on mount options and sb values |
1da177e4 | 369 | */ |
0771fb45 | 370 | STATIC int |
7884bc86 | 371 | xfs_update_alignment(xfs_mount_t *mp) |
1da177e4 | 372 | { |
1da177e4 | 373 | xfs_sb_t *sbp = &(mp->m_sb); |
1da177e4 | 374 | |
4249023a | 375 | if (mp->m_dalign) { |
1da177e4 LT |
376 | /* |
377 | * If stripe unit and stripe width are not multiples | |
378 | * of the fs blocksize turn off alignment. | |
379 | */ | |
380 | if ((BBTOB(mp->m_dalign) & mp->m_blockmask) || | |
381 | (BBTOB(mp->m_swidth) & mp->m_blockmask)) { | |
39a45d84 JL |
382 | xfs_warn(mp, |
383 | "alignment check failed: sunit/swidth vs. blocksize(%d)", | |
384 | sbp->sb_blocksize); | |
2451337d | 385 | return -EINVAL; |
1da177e4 LT |
386 | } else { |
387 | /* | |
388 | * Convert the stripe unit and width to FSBs. | |
389 | */ | |
390 | mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign); | |
391 | if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) { | |
53487786 | 392 | xfs_warn(mp, |
39a45d84 JL |
393 | "alignment check failed: sunit/swidth vs. agsize(%d)", |
394 | sbp->sb_agblocks); | |
2451337d | 395 | return -EINVAL; |
1da177e4 LT |
396 | } else if (mp->m_dalign) { |
397 | mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth); | |
398 | } else { | |
39a45d84 JL |
399 | xfs_warn(mp, |
400 | "alignment check failed: sunit(%d) less than bsize(%d)", | |
401 | mp->m_dalign, sbp->sb_blocksize); | |
2451337d | 402 | return -EINVAL; |
1da177e4 LT |
403 | } |
404 | } | |
405 | ||
406 | /* | |
407 | * Update superblock with new values | |
408 | * and log changes | |
409 | */ | |
62118709 | 410 | if (xfs_sb_version_hasdalign(sbp)) { |
1da177e4 LT |
411 | if (sbp->sb_unit != mp->m_dalign) { |
412 | sbp->sb_unit = mp->m_dalign; | |
7884bc86 | 413 | mp->m_update_flags |= XFS_SB_UNIT; |
1da177e4 LT |
414 | } |
415 | if (sbp->sb_width != mp->m_swidth) { | |
416 | sbp->sb_width = mp->m_swidth; | |
7884bc86 | 417 | mp->m_update_flags |= XFS_SB_WIDTH; |
1da177e4 | 418 | } |
34d7f603 JL |
419 | } else { |
420 | xfs_warn(mp, | |
421 | "cannot change alignment: superblock does not support data alignment"); | |
2451337d | 422 | return -EINVAL; |
1da177e4 LT |
423 | } |
424 | } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN && | |
62118709 | 425 | xfs_sb_version_hasdalign(&mp->m_sb)) { |
1da177e4 LT |
426 | mp->m_dalign = sbp->sb_unit; |
427 | mp->m_swidth = sbp->sb_width; | |
428 | } | |
429 | ||
0771fb45 ES |
430 | return 0; |
431 | } | |
1da177e4 | 432 | |
0771fb45 ES |
433 | /* |
434 | * Set the maximum inode count for this filesystem | |
435 | */ | |
436 | STATIC void | |
437 | xfs_set_maxicount(xfs_mount_t *mp) | |
438 | { | |
439 | xfs_sb_t *sbp = &(mp->m_sb); | |
440 | __uint64_t icount; | |
1da177e4 | 441 | |
0771fb45 ES |
442 | if (sbp->sb_imax_pct) { |
443 | /* | |
444 | * Make sure the maximum inode count is a multiple | |
445 | * of the units we allocate inodes in. | |
1da177e4 | 446 | */ |
1da177e4 LT |
447 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; |
448 | do_div(icount, 100); | |
449 | do_div(icount, mp->m_ialloc_blks); | |
450 | mp->m_maxicount = (icount * mp->m_ialloc_blks) << | |
451 | sbp->sb_inopblog; | |
0771fb45 | 452 | } else { |
1da177e4 | 453 | mp->m_maxicount = 0; |
1da177e4 | 454 | } |
0771fb45 ES |
455 | } |
456 | ||
457 | /* | |
458 | * Set the default minimum read and write sizes unless | |
459 | * already specified in a mount option. | |
460 | * We use smaller I/O sizes when the file system | |
461 | * is being used for NFS service (wsync mount option). | |
462 | */ | |
463 | STATIC void | |
464 | xfs_set_rw_sizes(xfs_mount_t *mp) | |
465 | { | |
466 | xfs_sb_t *sbp = &(mp->m_sb); | |
467 | int readio_log, writeio_log; | |
1da177e4 | 468 | |
1da177e4 LT |
469 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { |
470 | if (mp->m_flags & XFS_MOUNT_WSYNC) { | |
471 | readio_log = XFS_WSYNC_READIO_LOG; | |
472 | writeio_log = XFS_WSYNC_WRITEIO_LOG; | |
473 | } else { | |
474 | readio_log = XFS_READIO_LOG_LARGE; | |
475 | writeio_log = XFS_WRITEIO_LOG_LARGE; | |
476 | } | |
477 | } else { | |
478 | readio_log = mp->m_readio_log; | |
479 | writeio_log = mp->m_writeio_log; | |
480 | } | |
481 | ||
1da177e4 LT |
482 | if (sbp->sb_blocklog > readio_log) { |
483 | mp->m_readio_log = sbp->sb_blocklog; | |
484 | } else { | |
485 | mp->m_readio_log = readio_log; | |
486 | } | |
487 | mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog); | |
488 | if (sbp->sb_blocklog > writeio_log) { | |
489 | mp->m_writeio_log = sbp->sb_blocklog; | |
490 | } else { | |
491 | mp->m_writeio_log = writeio_log; | |
492 | } | |
493 | mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog); | |
0771fb45 | 494 | } |
1da177e4 | 495 | |
055388a3 DC |
496 | /* |
497 | * precalculate the low space thresholds for dynamic speculative preallocation. | |
498 | */ | |
499 | void | |
500 | xfs_set_low_space_thresholds( | |
501 | struct xfs_mount *mp) | |
502 | { | |
503 | int i; | |
504 | ||
505 | for (i = 0; i < XFS_LOWSP_MAX; i++) { | |
506 | __uint64_t space = mp->m_sb.sb_dblocks; | |
507 | ||
508 | do_div(space, 100); | |
509 | mp->m_low_space[i] = space * (i + 1); | |
510 | } | |
511 | } | |
512 | ||
513 | ||
0771fb45 ES |
514 | /* |
515 | * Set whether we're using inode alignment. | |
516 | */ | |
517 | STATIC void | |
518 | xfs_set_inoalignment(xfs_mount_t *mp) | |
519 | { | |
62118709 | 520 | if (xfs_sb_version_hasalign(&mp->m_sb) && |
1da177e4 LT |
521 | mp->m_sb.sb_inoalignmt >= |
522 | XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size)) | |
523 | mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1; | |
524 | else | |
525 | mp->m_inoalign_mask = 0; | |
526 | /* | |
527 | * If we are using stripe alignment, check whether | |
528 | * the stripe unit is a multiple of the inode alignment | |
529 | */ | |
530 | if (mp->m_dalign && mp->m_inoalign_mask && | |
531 | !(mp->m_dalign & mp->m_inoalign_mask)) | |
532 | mp->m_sinoalign = mp->m_dalign; | |
533 | else | |
534 | mp->m_sinoalign = 0; | |
0771fb45 ES |
535 | } |
536 | ||
537 | /* | |
0471f62e | 538 | * Check that the data (and log if separate) is an ok size. |
0771fb45 ES |
539 | */ |
540 | STATIC int | |
ba372674 DC |
541 | xfs_check_sizes( |
542 | struct xfs_mount *mp) | |
0771fb45 | 543 | { |
ba372674 | 544 | struct xfs_buf *bp; |
0771fb45 | 545 | xfs_daddr_t d; |
ba372674 | 546 | int error; |
0771fb45 | 547 | |
1da177e4 LT |
548 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); |
549 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) { | |
0b932ccc | 550 | xfs_warn(mp, "filesystem size mismatch detected"); |
2451337d | 551 | return -EFBIG; |
1da177e4 | 552 | } |
ba372674 | 553 | error = xfs_buf_read_uncached(mp->m_ddev_targp, |
1922c949 | 554 | d - XFS_FSS_TO_BB(mp, 1), |
ba372674 DC |
555 | XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL); |
556 | if (error) { | |
0b932ccc | 557 | xfs_warn(mp, "last sector read failed"); |
ba372674 | 558 | return error; |
1da177e4 | 559 | } |
1922c949 | 560 | xfs_buf_relse(bp); |
1da177e4 | 561 | |
ba372674 DC |
562 | if (mp->m_logdev_targp == mp->m_ddev_targp) |
563 | return 0; | |
564 | ||
565 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks); | |
566 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) { | |
567 | xfs_warn(mp, "log size mismatch detected"); | |
568 | return -EFBIG; | |
569 | } | |
570 | error = xfs_buf_read_uncached(mp->m_logdev_targp, | |
1922c949 | 571 | d - XFS_FSB_TO_BB(mp, 1), |
ba372674 DC |
572 | XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL); |
573 | if (error) { | |
574 | xfs_warn(mp, "log device read failed"); | |
575 | return error; | |
0771fb45 | 576 | } |
ba372674 | 577 | xfs_buf_relse(bp); |
0771fb45 ES |
578 | return 0; |
579 | } | |
580 | ||
7d095257 CH |
581 | /* |
582 | * Clear the quotaflags in memory and in the superblock. | |
583 | */ | |
584 | int | |
585 | xfs_mount_reset_sbqflags( | |
586 | struct xfs_mount *mp) | |
587 | { | |
588 | int error; | |
589 | struct xfs_trans *tp; | |
590 | ||
591 | mp->m_qflags = 0; | |
592 | ||
593 | /* | |
594 | * It is OK to look at sb_qflags here in mount path, | |
595 | * without m_sb_lock. | |
596 | */ | |
597 | if (mp->m_sb.sb_qflags == 0) | |
598 | return 0; | |
599 | spin_lock(&mp->m_sb_lock); | |
600 | mp->m_sb.sb_qflags = 0; | |
601 | spin_unlock(&mp->m_sb_lock); | |
602 | ||
603 | /* | |
604 | * If the fs is readonly, let the incore superblock run | |
605 | * with quotas off but don't flush the update out to disk | |
606 | */ | |
607 | if (mp->m_flags & XFS_MOUNT_RDONLY) | |
608 | return 0; | |
609 | ||
7d095257 | 610 | tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE); |
3d3c8b52 | 611 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_sbchange, 0, 0); |
7d095257 CH |
612 | if (error) { |
613 | xfs_trans_cancel(tp, 0); | |
53487786 | 614 | xfs_alert(mp, "%s: Superblock update failed!", __func__); |
7d095257 CH |
615 | return error; |
616 | } | |
617 | ||
618 | xfs_mod_sb(tp, XFS_SB_QFLAGS); | |
619 | return xfs_trans_commit(tp, 0); | |
620 | } | |
621 | ||
d5db0f97 ES |
622 | __uint64_t |
623 | xfs_default_resblks(xfs_mount_t *mp) | |
624 | { | |
625 | __uint64_t resblks; | |
626 | ||
627 | /* | |
8babd8a2 DC |
628 | * We default to 5% or 8192 fsbs of space reserved, whichever is |
629 | * smaller. This is intended to cover concurrent allocation | |
630 | * transactions when we initially hit enospc. These each require a 4 | |
631 | * block reservation. Hence by default we cover roughly 2000 concurrent | |
632 | * allocation reservations. | |
d5db0f97 ES |
633 | */ |
634 | resblks = mp->m_sb.sb_dblocks; | |
635 | do_div(resblks, 20); | |
8babd8a2 | 636 | resblks = min_t(__uint64_t, resblks, 8192); |
d5db0f97 ES |
637 | return resblks; |
638 | } | |
639 | ||
0771fb45 | 640 | /* |
0771fb45 ES |
641 | * This function does the following on an initial mount of a file system: |
642 | * - reads the superblock from disk and init the mount struct | |
643 | * - if we're a 32-bit kernel, do a size check on the superblock | |
644 | * so we don't mount terabyte filesystems | |
645 | * - init mount struct realtime fields | |
646 | * - allocate inode hash table for fs | |
647 | * - init directory manager | |
648 | * - perform recovery and init the log manager | |
649 | */ | |
650 | int | |
651 | xfs_mountfs( | |
4249023a | 652 | xfs_mount_t *mp) |
0771fb45 ES |
653 | { |
654 | xfs_sb_t *sbp = &(mp->m_sb); | |
655 | xfs_inode_t *rip; | |
0771fb45 | 656 | __uint64_t resblks; |
7d095257 CH |
657 | uint quotamount = 0; |
658 | uint quotaflags = 0; | |
0771fb45 ES |
659 | int error = 0; |
660 | ||
ff55068c | 661 | xfs_sb_mount_common(mp, sbp); |
0771fb45 | 662 | |
ee1c0908 | 663 | /* |
e6957ea4 ES |
664 | * Check for a mismatched features2 values. Older kernels |
665 | * read & wrote into the wrong sb offset for sb_features2 | |
666 | * on some platforms due to xfs_sb_t not being 64bit size aligned | |
667 | * when sb_features2 was added, which made older superblock | |
668 | * reading/writing routines swap it as a 64-bit value. | |
ee1c0908 | 669 | * |
e6957ea4 ES |
670 | * For backwards compatibility, we make both slots equal. |
671 | * | |
672 | * If we detect a mismatched field, we OR the set bits into the | |
673 | * existing features2 field in case it has already been modified; we | |
674 | * don't want to lose any features. We then update the bad location | |
675 | * with the ORed value so that older kernels will see any features2 | |
676 | * flags, and mark the two fields as needing updates once the | |
677 | * transaction subsystem is online. | |
ee1c0908 | 678 | */ |
e6957ea4 | 679 | if (xfs_sb_has_mismatched_features2(sbp)) { |
0b932ccc | 680 | xfs_warn(mp, "correcting sb_features alignment problem"); |
ee1c0908 | 681 | sbp->sb_features2 |= sbp->sb_bad_features2; |
e6957ea4 | 682 | sbp->sb_bad_features2 = sbp->sb_features2; |
7884bc86 | 683 | mp->m_update_flags |= XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2; |
e6957ea4 ES |
684 | |
685 | /* | |
686 | * Re-check for ATTR2 in case it was found in bad_features2 | |
687 | * slot. | |
688 | */ | |
7c12f296 TS |
689 | if (xfs_sb_version_hasattr2(&mp->m_sb) && |
690 | !(mp->m_flags & XFS_MOUNT_NOATTR2)) | |
e6957ea4 | 691 | mp->m_flags |= XFS_MOUNT_ATTR2; |
7c12f296 TS |
692 | } |
693 | ||
694 | if (xfs_sb_version_hasattr2(&mp->m_sb) && | |
695 | (mp->m_flags & XFS_MOUNT_NOATTR2)) { | |
696 | xfs_sb_version_removeattr2(&mp->m_sb); | |
7884bc86 | 697 | mp->m_update_flags |= XFS_SB_FEATURES2; |
e6957ea4 | 698 | |
7c12f296 TS |
699 | /* update sb_versionnum for the clearing of the morebits */ |
700 | if (!sbp->sb_features2) | |
7884bc86 | 701 | mp->m_update_flags |= XFS_SB_VERSIONNUM; |
ee1c0908 DC |
702 | } |
703 | ||
263997a6 DC |
704 | /* always use v2 inodes by default now */ |
705 | if (!(mp->m_sb.sb_versionnum & XFS_SB_VERSION_NLINKBIT)) { | |
706 | mp->m_sb.sb_versionnum |= XFS_SB_VERSION_NLINKBIT; | |
707 | mp->m_update_flags |= XFS_SB_VERSIONNUM; | |
708 | } | |
709 | ||
0771fb45 ES |
710 | /* |
711 | * Check if sb_agblocks is aligned at stripe boundary | |
712 | * If sb_agblocks is NOT aligned turn off m_dalign since | |
713 | * allocator alignment is within an ag, therefore ag has | |
714 | * to be aligned at stripe boundary. | |
715 | */ | |
7884bc86 | 716 | error = xfs_update_alignment(mp); |
0771fb45 | 717 | if (error) |
f9057e3d | 718 | goto out; |
0771fb45 ES |
719 | |
720 | xfs_alloc_compute_maxlevels(mp); | |
721 | xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK); | |
722 | xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK); | |
723 | xfs_ialloc_compute_maxlevels(mp); | |
724 | ||
725 | xfs_set_maxicount(mp); | |
726 | ||
a31b1d3d | 727 | error = xfs_sysfs_init(&mp->m_kobj, &xfs_mp_ktype, NULL, mp->m_fsname); |
27174203 CH |
728 | if (error) |
729 | goto out; | |
1da177e4 | 730 | |
a31b1d3d BF |
731 | error = xfs_uuid_mount(mp); |
732 | if (error) | |
733 | goto out_remove_sysfs; | |
734 | ||
0771fb45 ES |
735 | /* |
736 | * Set the minimum read and write sizes | |
737 | */ | |
738 | xfs_set_rw_sizes(mp); | |
739 | ||
055388a3 DC |
740 | /* set the low space thresholds for dynamic preallocation */ |
741 | xfs_set_low_space_thresholds(mp); | |
742 | ||
0771fb45 ES |
743 | /* |
744 | * Set the inode cluster size. | |
745 | * This may still be overridden by the file system | |
746 | * block size if it is larger than the chosen cluster size. | |
8f80587b DC |
747 | * |
748 | * For v5 filesystems, scale the cluster size with the inode size to | |
749 | * keep a constant ratio of inode per cluster buffer, but only if mkfs | |
750 | * has set the inode alignment value appropriately for larger cluster | |
751 | * sizes. | |
0771fb45 ES |
752 | */ |
753 | mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE; | |
8f80587b DC |
754 | if (xfs_sb_version_hascrc(&mp->m_sb)) { |
755 | int new_size = mp->m_inode_cluster_size; | |
756 | ||
757 | new_size *= mp->m_sb.sb_inodesize / XFS_DINODE_MIN_SIZE; | |
758 | if (mp->m_sb.sb_inoalignmt >= XFS_B_TO_FSBT(mp, new_size)) | |
759 | mp->m_inode_cluster_size = new_size; | |
8f80587b | 760 | } |
0771fb45 ES |
761 | |
762 | /* | |
763 | * Set inode alignment fields | |
764 | */ | |
765 | xfs_set_inoalignment(mp); | |
766 | ||
767 | /* | |
c2bfbc9b | 768 | * Check that the data (and log if separate) is an ok size. |
0771fb45 | 769 | */ |
4249023a | 770 | error = xfs_check_sizes(mp); |
0771fb45 | 771 | if (error) |
f9057e3d | 772 | goto out_remove_uuid; |
0771fb45 | 773 | |
1da177e4 LT |
774 | /* |
775 | * Initialize realtime fields in the mount structure | |
776 | */ | |
0771fb45 ES |
777 | error = xfs_rtmount_init(mp); |
778 | if (error) { | |
0b932ccc | 779 | xfs_warn(mp, "RT mount failed"); |
f9057e3d | 780 | goto out_remove_uuid; |
1da177e4 LT |
781 | } |
782 | ||
1da177e4 LT |
783 | /* |
784 | * Copies the low order bits of the timestamp and the randomly | |
785 | * set "sequence" number out of a UUID. | |
786 | */ | |
787 | uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid); | |
788 | ||
1da177e4 LT |
789 | mp->m_dmevmask = 0; /* not persistent; set after each mount */ |
790 | ||
0650b554 DC |
791 | error = xfs_da_mount(mp); |
792 | if (error) { | |
793 | xfs_warn(mp, "Failed dir/attr init: %d", error); | |
794 | goto out_remove_uuid; | |
795 | } | |
1da177e4 LT |
796 | |
797 | /* | |
798 | * Initialize the precomputed transaction reservations values. | |
799 | */ | |
800 | xfs_trans_init(mp); | |
801 | ||
1da177e4 LT |
802 | /* |
803 | * Allocate and initialize the per-ag data. | |
804 | */ | |
1c1c6ebc | 805 | spin_lock_init(&mp->m_perag_lock); |
9b98b6f3 | 806 | INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC); |
1c1c6ebc DC |
807 | error = xfs_initialize_perag(mp, sbp->sb_agcount, &mp->m_maxagi); |
808 | if (error) { | |
0b932ccc | 809 | xfs_warn(mp, "Failed per-ag init: %d", error); |
0650b554 | 810 | goto out_free_dir; |
1c1c6ebc | 811 | } |
1da177e4 | 812 | |
f9057e3d | 813 | if (!sbp->sb_logblocks) { |
0b932ccc | 814 | xfs_warn(mp, "no log defined"); |
f9057e3d | 815 | XFS_ERROR_REPORT("xfs_mountfs", XFS_ERRLEVEL_LOW, mp); |
2451337d | 816 | error = -EFSCORRUPTED; |
f9057e3d CH |
817 | goto out_free_perag; |
818 | } | |
819 | ||
1da177e4 LT |
820 | /* |
821 | * log's mount-time initialization. Perform 1st part recovery if needed | |
822 | */ | |
f9057e3d CH |
823 | error = xfs_log_mount(mp, mp->m_logdev_targp, |
824 | XFS_FSB_TO_DADDR(mp, sbp->sb_logstart), | |
825 | XFS_FSB_TO_BB(mp, sbp->sb_logblocks)); | |
826 | if (error) { | |
0b932ccc | 827 | xfs_warn(mp, "log mount failed"); |
d4f3512b | 828 | goto out_fail_wait; |
1da177e4 LT |
829 | } |
830 | ||
92821e2b DC |
831 | /* |
832 | * Now the log is mounted, we know if it was an unclean shutdown or | |
833 | * not. If it was, with the first phase of recovery has completed, we | |
834 | * have consistent AG blocks on disk. We have not recovered EFIs yet, | |
835 | * but they are recovered transactionally in the second recovery phase | |
836 | * later. | |
837 | * | |
838 | * Hence we can safely re-initialise incore superblock counters from | |
839 | * the per-ag data. These may not be correct if the filesystem was not | |
840 | * cleanly unmounted, so we need to wait for recovery to finish before | |
841 | * doing this. | |
842 | * | |
843 | * If the filesystem was cleanly unmounted, then we can trust the | |
844 | * values in the superblock to be correct and we don't need to do | |
845 | * anything here. | |
846 | * | |
847 | * If we are currently making the filesystem, the initialisation will | |
848 | * fail as the perag data is in an undefined state. | |
849 | */ | |
92821e2b DC |
850 | if (xfs_sb_version_haslazysbcount(&mp->m_sb) && |
851 | !XFS_LAST_UNMOUNT_WAS_CLEAN(mp) && | |
852 | !mp->m_sb.sb_inprogress) { | |
853 | error = xfs_initialize_perag_data(mp, sbp->sb_agcount); | |
f9057e3d | 854 | if (error) |
6eee8972 | 855 | goto out_log_dealloc; |
92821e2b | 856 | } |
f9057e3d | 857 | |
1da177e4 LT |
858 | /* |
859 | * Get and sanity-check the root inode. | |
860 | * Save the pointer to it in the mount structure. | |
861 | */ | |
7b6259e7 | 862 | error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip); |
1da177e4 | 863 | if (error) { |
0b932ccc | 864 | xfs_warn(mp, "failed to read root inode"); |
f9057e3d | 865 | goto out_log_dealloc; |
1da177e4 LT |
866 | } |
867 | ||
868 | ASSERT(rip != NULL); | |
1da177e4 | 869 | |
abbede1b | 870 | if (unlikely(!S_ISDIR(rip->i_d.di_mode))) { |
0b932ccc | 871 | xfs_warn(mp, "corrupted root inode %llu: not a directory", |
b6574520 | 872 | (unsigned long long)rip->i_ino); |
1da177e4 LT |
873 | xfs_iunlock(rip, XFS_ILOCK_EXCL); |
874 | XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW, | |
875 | mp); | |
2451337d | 876 | error = -EFSCORRUPTED; |
f9057e3d | 877 | goto out_rele_rip; |
1da177e4 LT |
878 | } |
879 | mp->m_rootip = rip; /* save it */ | |
880 | ||
881 | xfs_iunlock(rip, XFS_ILOCK_EXCL); | |
882 | ||
883 | /* | |
884 | * Initialize realtime inode pointers in the mount structure | |
885 | */ | |
0771fb45 ES |
886 | error = xfs_rtmount_inodes(mp); |
887 | if (error) { | |
1da177e4 LT |
888 | /* |
889 | * Free up the root inode. | |
890 | */ | |
0b932ccc | 891 | xfs_warn(mp, "failed to read RT inodes"); |
f9057e3d | 892 | goto out_rele_rip; |
1da177e4 LT |
893 | } |
894 | ||
895 | /* | |
7884bc86 CH |
896 | * If this is a read-only mount defer the superblock updates until |
897 | * the next remount into writeable mode. Otherwise we would never | |
898 | * perform the update e.g. for the root filesystem. | |
1da177e4 | 899 | */ |
7884bc86 CH |
900 | if (mp->m_update_flags && !(mp->m_flags & XFS_MOUNT_RDONLY)) { |
901 | error = xfs_mount_log_sb(mp, mp->m_update_flags); | |
e5720eec | 902 | if (error) { |
0b932ccc | 903 | xfs_warn(mp, "failed to write sb changes"); |
b93b6e43 | 904 | goto out_rtunmount; |
e5720eec DC |
905 | } |
906 | } | |
1da177e4 LT |
907 | |
908 | /* | |
909 | * Initialise the XFS quota management subsystem for this mount | |
910 | */ | |
7d095257 CH |
911 | if (XFS_IS_QUOTA_RUNNING(mp)) { |
912 | error = xfs_qm_newmount(mp, "amount, "aflags); | |
913 | if (error) | |
914 | goto out_rtunmount; | |
915 | } else { | |
916 | ASSERT(!XFS_IS_QUOTA_ON(mp)); | |
917 | ||
918 | /* | |
919 | * If a file system had quotas running earlier, but decided to | |
920 | * mount without -o uquota/pquota/gquota options, revoke the | |
921 | * quotachecked license. | |
922 | */ | |
923 | if (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT) { | |
0b932ccc | 924 | xfs_notice(mp, "resetting quota flags"); |
7d095257 CH |
925 | error = xfs_mount_reset_sbqflags(mp); |
926 | if (error) | |
a70a4fa5 | 927 | goto out_rtunmount; |
7d095257 CH |
928 | } |
929 | } | |
1da177e4 LT |
930 | |
931 | /* | |
932 | * Finish recovering the file system. This part needed to be | |
933 | * delayed until after the root and real-time bitmap inodes | |
934 | * were consistently read in. | |
935 | */ | |
4249023a | 936 | error = xfs_log_mount_finish(mp); |
1da177e4 | 937 | if (error) { |
0b932ccc | 938 | xfs_warn(mp, "log mount finish failed"); |
b93b6e43 | 939 | goto out_rtunmount; |
1da177e4 LT |
940 | } |
941 | ||
942 | /* | |
943 | * Complete the quota initialisation, post-log-replay component. | |
944 | */ | |
7d095257 CH |
945 | if (quotamount) { |
946 | ASSERT(mp->m_qflags == 0); | |
947 | mp->m_qflags = quotaflags; | |
948 | ||
949 | xfs_qm_mount_quotas(mp); | |
950 | } | |
951 | ||
84e1e99f DC |
952 | /* |
953 | * Now we are mounted, reserve a small amount of unused space for | |
954 | * privileged transactions. This is needed so that transaction | |
955 | * space required for critical operations can dip into this pool | |
956 | * when at ENOSPC. This is needed for operations like create with | |
957 | * attr, unwritten extent conversion at ENOSPC, etc. Data allocations | |
958 | * are not allowed to use this reserved space. | |
8babd8a2 DC |
959 | * |
960 | * This may drive us straight to ENOSPC on mount, but that implies | |
961 | * we were already there on the last unmount. Warn if this occurs. | |
84e1e99f | 962 | */ |
d5db0f97 ES |
963 | if (!(mp->m_flags & XFS_MOUNT_RDONLY)) { |
964 | resblks = xfs_default_resblks(mp); | |
965 | error = xfs_reserve_blocks(mp, &resblks, NULL); | |
966 | if (error) | |
0b932ccc DC |
967 | xfs_warn(mp, |
968 | "Unable to allocate reserve blocks. Continuing without reserve pool."); | |
d5db0f97 | 969 | } |
84e1e99f | 970 | |
1da177e4 LT |
971 | return 0; |
972 | ||
b93b6e43 CH |
973 | out_rtunmount: |
974 | xfs_rtunmount_inodes(mp); | |
f9057e3d | 975 | out_rele_rip: |
43355099 | 976 | IRELE(rip); |
f9057e3d | 977 | out_log_dealloc: |
21b699c8 | 978 | xfs_log_unmount(mp); |
d4f3512b DC |
979 | out_fail_wait: |
980 | if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) | |
981 | xfs_wait_buftarg(mp->m_logdev_targp); | |
982 | xfs_wait_buftarg(mp->m_ddev_targp); | |
f9057e3d | 983 | out_free_perag: |
ff4f038c | 984 | xfs_free_perag(mp); |
0650b554 DC |
985 | out_free_dir: |
986 | xfs_da_unmount(mp); | |
f9057e3d | 987 | out_remove_uuid: |
27174203 | 988 | xfs_uuid_unmount(mp); |
a31b1d3d BF |
989 | out_remove_sysfs: |
990 | xfs_sysfs_del(&mp->m_kobj); | |
f9057e3d | 991 | out: |
1da177e4 LT |
992 | return error; |
993 | } | |
994 | ||
995 | /* | |
1da177e4 LT |
996 | * This flushes out the inodes,dquots and the superblock, unmounts the |
997 | * log and makes sure that incore structures are freed. | |
998 | */ | |
41b5c2e7 CH |
999 | void |
1000 | xfs_unmountfs( | |
1001 | struct xfs_mount *mp) | |
1da177e4 | 1002 | { |
41b5c2e7 CH |
1003 | __uint64_t resblks; |
1004 | int error; | |
1da177e4 | 1005 | |
579b62fa BF |
1006 | cancel_delayed_work_sync(&mp->m_eofblocks_work); |
1007 | ||
7d095257 | 1008 | xfs_qm_unmount_quotas(mp); |
b93b6e43 | 1009 | xfs_rtunmount_inodes(mp); |
77508ec8 CH |
1010 | IRELE(mp->m_rootip); |
1011 | ||
641c56fb DC |
1012 | /* |
1013 | * We can potentially deadlock here if we have an inode cluster | |
9da096fd | 1014 | * that has been freed has its buffer still pinned in memory because |
641c56fb DC |
1015 | * the transaction is still sitting in a iclog. The stale inodes |
1016 | * on that buffer will have their flush locks held until the | |
1017 | * transaction hits the disk and the callbacks run. the inode | |
1018 | * flush takes the flush lock unconditionally and with nothing to | |
1019 | * push out the iclog we will never get that unlocked. hence we | |
1020 | * need to force the log first. | |
1021 | */ | |
a14a348b | 1022 | xfs_log_force(mp, XFS_LOG_SYNC); |
c854363e DC |
1023 | |
1024 | /* | |
211e4d43 CH |
1025 | * Flush all pending changes from the AIL. |
1026 | */ | |
1027 | xfs_ail_push_all_sync(mp->m_ail); | |
1028 | ||
1029 | /* | |
1030 | * And reclaim all inodes. At this point there should be no dirty | |
7e18530b DC |
1031 | * inodes and none should be pinned or locked, but use synchronous |
1032 | * reclaim just to be sure. We can stop background inode reclaim | |
1033 | * here as well if it is still running. | |
c854363e | 1034 | */ |
7e18530b | 1035 | cancel_delayed_work_sync(&mp->m_reclaim_work); |
c854363e | 1036 | xfs_reclaim_inodes(mp, SYNC_WAIT); |
1da177e4 | 1037 | |
7d095257 | 1038 | xfs_qm_unmount(mp); |
a357a121 | 1039 | |
84e1e99f DC |
1040 | /* |
1041 | * Unreserve any blocks we have so that when we unmount we don't account | |
1042 | * the reserved free space as used. This is really only necessary for | |
1043 | * lazy superblock counting because it trusts the incore superblock | |
9da096fd | 1044 | * counters to be absolutely correct on clean unmount. |
84e1e99f DC |
1045 | * |
1046 | * We don't bother correcting this elsewhere for lazy superblock | |
1047 | * counting because on mount of an unclean filesystem we reconstruct the | |
1048 | * correct counter value and this is irrelevant. | |
1049 | * | |
1050 | * For non-lazy counter filesystems, this doesn't matter at all because | |
1051 | * we only every apply deltas to the superblock and hence the incore | |
1052 | * value does not matter.... | |
1053 | */ | |
1054 | resblks = 0; | |
714082bc DC |
1055 | error = xfs_reserve_blocks(mp, &resblks, NULL); |
1056 | if (error) | |
0b932ccc | 1057 | xfs_warn(mp, "Unable to free reserved block pool. " |
714082bc DC |
1058 | "Freespace may not be correct on next mount."); |
1059 | ||
adab0f67 | 1060 | error = xfs_log_sbcount(mp); |
e5720eec | 1061 | if (error) |
0b932ccc | 1062 | xfs_warn(mp, "Unable to update superblock counters. " |
e5720eec | 1063 | "Freespace may not be correct on next mount."); |
87c7bec7 | 1064 | |
21b699c8 | 1065 | xfs_log_unmount(mp); |
0650b554 | 1066 | xfs_da_unmount(mp); |
27174203 | 1067 | xfs_uuid_unmount(mp); |
1da177e4 | 1068 | |
1550d0b0 | 1069 | #if defined(DEBUG) |
0ce4cfd4 | 1070 | xfs_errortag_clearall(mp, 0); |
1da177e4 | 1071 | #endif |
ff4f038c | 1072 | xfs_free_perag(mp); |
a31b1d3d BF |
1073 | |
1074 | xfs_sysfs_del(&mp->m_kobj); | |
1da177e4 LT |
1075 | } |
1076 | ||
92821e2b DC |
1077 | int |
1078 | xfs_fs_writable(xfs_mount_t *mp) | |
1079 | { | |
d9457dc0 | 1080 | return !(mp->m_super->s_writers.frozen || XFS_FORCED_SHUTDOWN(mp) || |
bd186aa9 | 1081 | (mp->m_flags & XFS_MOUNT_RDONLY)); |
92821e2b DC |
1082 | } |
1083 | ||
1084 | /* | |
b2ce3974 AE |
1085 | * xfs_log_sbcount |
1086 | * | |
adab0f67 | 1087 | * Sync the superblock counters to disk. |
b2ce3974 AE |
1088 | * |
1089 | * Note this code can be called during the process of freezing, so | |
adab0f67 | 1090 | * we may need to use the transaction allocator which does not |
b2ce3974 | 1091 | * block when the transaction subsystem is in its frozen state. |
92821e2b DC |
1092 | */ |
1093 | int | |
adab0f67 | 1094 | xfs_log_sbcount(xfs_mount_t *mp) |
92821e2b DC |
1095 | { |
1096 | xfs_trans_t *tp; | |
1097 | int error; | |
1098 | ||
1099 | if (!xfs_fs_writable(mp)) | |
1100 | return 0; | |
1101 | ||
d4d90b57 | 1102 | xfs_icsb_sync_counters(mp, 0); |
92821e2b DC |
1103 | |
1104 | /* | |
1105 | * we don't need to do this if we are updating the superblock | |
1106 | * counters on every modification. | |
1107 | */ | |
1108 | if (!xfs_sb_version_haslazysbcount(&mp->m_sb)) | |
1109 | return 0; | |
1110 | ||
b2ce3974 | 1111 | tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_COUNT, KM_SLEEP); |
3d3c8b52 | 1112 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0); |
92821e2b DC |
1113 | if (error) { |
1114 | xfs_trans_cancel(tp, 0); | |
1115 | return error; | |
1116 | } | |
1117 | ||
1118 | xfs_mod_sb(tp, XFS_SB_IFREE | XFS_SB_ICOUNT | XFS_SB_FDBLOCKS); | |
adab0f67 | 1119 | xfs_trans_set_sync(tp); |
e5720eec DC |
1120 | error = xfs_trans_commit(tp, 0); |
1121 | return error; | |
92821e2b DC |
1122 | } |
1123 | ||
1da177e4 | 1124 | /* |
99e738b7 | 1125 | * xfs_mod_incore_sb_unlocked() is a utility routine commonly used to apply |
1da177e4 LT |
1126 | * a delta to a specified field in the in-core superblock. Simply |
1127 | * switch on the field indicated and apply the delta to that field. | |
1128 | * Fields are not allowed to dip below zero, so if the delta would | |
1129 | * do this do not apply it and return EINVAL. | |
1130 | * | |
3685c2a1 | 1131 | * The m_sb_lock must be held when this routine is called. |
1da177e4 | 1132 | */ |
d96f8f89 | 1133 | STATIC int |
20f4ebf2 DC |
1134 | xfs_mod_incore_sb_unlocked( |
1135 | xfs_mount_t *mp, | |
1136 | xfs_sb_field_t field, | |
1137 | int64_t delta, | |
1138 | int rsvd) | |
1da177e4 LT |
1139 | { |
1140 | int scounter; /* short counter for 32 bit fields */ | |
1141 | long long lcounter; /* long counter for 64 bit fields */ | |
1142 | long long res_used, rem; | |
1143 | ||
1144 | /* | |
1145 | * With the in-core superblock spin lock held, switch | |
1146 | * on the indicated field. Apply the delta to the | |
1147 | * proper field. If the fields value would dip below | |
1148 | * 0, then do not apply the delta and return EINVAL. | |
1149 | */ | |
1150 | switch (field) { | |
1151 | case XFS_SBS_ICOUNT: | |
1152 | lcounter = (long long)mp->m_sb.sb_icount; | |
1153 | lcounter += delta; | |
1154 | if (lcounter < 0) { | |
1155 | ASSERT(0); | |
2451337d | 1156 | return -EINVAL; |
1da177e4 LT |
1157 | } |
1158 | mp->m_sb.sb_icount = lcounter; | |
014c2544 | 1159 | return 0; |
1da177e4 LT |
1160 | case XFS_SBS_IFREE: |
1161 | lcounter = (long long)mp->m_sb.sb_ifree; | |
1162 | lcounter += delta; | |
1163 | if (lcounter < 0) { | |
1164 | ASSERT(0); | |
2451337d | 1165 | return -EINVAL; |
1da177e4 LT |
1166 | } |
1167 | mp->m_sb.sb_ifree = lcounter; | |
014c2544 | 1168 | return 0; |
1da177e4 | 1169 | case XFS_SBS_FDBLOCKS: |
4be536de DC |
1170 | lcounter = (long long) |
1171 | mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); | |
1da177e4 LT |
1172 | res_used = (long long)(mp->m_resblks - mp->m_resblks_avail); |
1173 | ||
1174 | if (delta > 0) { /* Putting blocks back */ | |
1175 | if (res_used > delta) { | |
1176 | mp->m_resblks_avail += delta; | |
1177 | } else { | |
1178 | rem = delta - res_used; | |
1179 | mp->m_resblks_avail = mp->m_resblks; | |
1180 | lcounter += rem; | |
1181 | } | |
1182 | } else { /* Taking blocks away */ | |
1da177e4 | 1183 | lcounter += delta; |
8babd8a2 DC |
1184 | if (lcounter >= 0) { |
1185 | mp->m_sb.sb_fdblocks = lcounter + | |
1186 | XFS_ALLOC_SET_ASIDE(mp); | |
1187 | return 0; | |
1188 | } | |
1da177e4 | 1189 | |
8babd8a2 DC |
1190 | /* |
1191 | * We are out of blocks, use any available reserved | |
1192 | * blocks if were allowed to. | |
1193 | */ | |
1194 | if (!rsvd) | |
2451337d | 1195 | return -ENOSPC; |
1da177e4 | 1196 | |
8babd8a2 DC |
1197 | lcounter = (long long)mp->m_resblks_avail + delta; |
1198 | if (lcounter >= 0) { | |
1199 | mp->m_resblks_avail = lcounter; | |
1200 | return 0; | |
1da177e4 | 1201 | } |
8babd8a2 DC |
1202 | printk_once(KERN_WARNING |
1203 | "Filesystem \"%s\": reserve blocks depleted! " | |
1204 | "Consider increasing reserve pool size.", | |
1205 | mp->m_fsname); | |
2451337d | 1206 | return -ENOSPC; |
1da177e4 LT |
1207 | } |
1208 | ||
4be536de | 1209 | mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
014c2544 | 1210 | return 0; |
1da177e4 LT |
1211 | case XFS_SBS_FREXTENTS: |
1212 | lcounter = (long long)mp->m_sb.sb_frextents; | |
1213 | lcounter += delta; | |
1214 | if (lcounter < 0) { | |
2451337d | 1215 | return -ENOSPC; |
1da177e4 LT |
1216 | } |
1217 | mp->m_sb.sb_frextents = lcounter; | |
014c2544 | 1218 | return 0; |
1da177e4 LT |
1219 | case XFS_SBS_DBLOCKS: |
1220 | lcounter = (long long)mp->m_sb.sb_dblocks; | |
1221 | lcounter += delta; | |
1222 | if (lcounter < 0) { | |
1223 | ASSERT(0); | |
2451337d | 1224 | return -EINVAL; |
1da177e4 LT |
1225 | } |
1226 | mp->m_sb.sb_dblocks = lcounter; | |
014c2544 | 1227 | return 0; |
1da177e4 LT |
1228 | case XFS_SBS_AGCOUNT: |
1229 | scounter = mp->m_sb.sb_agcount; | |
1230 | scounter += delta; | |
1231 | if (scounter < 0) { | |
1232 | ASSERT(0); | |
2451337d | 1233 | return -EINVAL; |
1da177e4 LT |
1234 | } |
1235 | mp->m_sb.sb_agcount = scounter; | |
014c2544 | 1236 | return 0; |
1da177e4 LT |
1237 | case XFS_SBS_IMAX_PCT: |
1238 | scounter = mp->m_sb.sb_imax_pct; | |
1239 | scounter += delta; | |
1240 | if (scounter < 0) { | |
1241 | ASSERT(0); | |
2451337d | 1242 | return -EINVAL; |
1da177e4 LT |
1243 | } |
1244 | mp->m_sb.sb_imax_pct = scounter; | |
014c2544 | 1245 | return 0; |
1da177e4 LT |
1246 | case XFS_SBS_REXTSIZE: |
1247 | scounter = mp->m_sb.sb_rextsize; | |
1248 | scounter += delta; | |
1249 | if (scounter < 0) { | |
1250 | ASSERT(0); | |
2451337d | 1251 | return -EINVAL; |
1da177e4 LT |
1252 | } |
1253 | mp->m_sb.sb_rextsize = scounter; | |
014c2544 | 1254 | return 0; |
1da177e4 LT |
1255 | case XFS_SBS_RBMBLOCKS: |
1256 | scounter = mp->m_sb.sb_rbmblocks; | |
1257 | scounter += delta; | |
1258 | if (scounter < 0) { | |
1259 | ASSERT(0); | |
2451337d | 1260 | return -EINVAL; |
1da177e4 LT |
1261 | } |
1262 | mp->m_sb.sb_rbmblocks = scounter; | |
014c2544 | 1263 | return 0; |
1da177e4 LT |
1264 | case XFS_SBS_RBLOCKS: |
1265 | lcounter = (long long)mp->m_sb.sb_rblocks; | |
1266 | lcounter += delta; | |
1267 | if (lcounter < 0) { | |
1268 | ASSERT(0); | |
2451337d | 1269 | return -EINVAL; |
1da177e4 LT |
1270 | } |
1271 | mp->m_sb.sb_rblocks = lcounter; | |
014c2544 | 1272 | return 0; |
1da177e4 LT |
1273 | case XFS_SBS_REXTENTS: |
1274 | lcounter = (long long)mp->m_sb.sb_rextents; | |
1275 | lcounter += delta; | |
1276 | if (lcounter < 0) { | |
1277 | ASSERT(0); | |
2451337d | 1278 | return -EINVAL; |
1da177e4 LT |
1279 | } |
1280 | mp->m_sb.sb_rextents = lcounter; | |
014c2544 | 1281 | return 0; |
1da177e4 LT |
1282 | case XFS_SBS_REXTSLOG: |
1283 | scounter = mp->m_sb.sb_rextslog; | |
1284 | scounter += delta; | |
1285 | if (scounter < 0) { | |
1286 | ASSERT(0); | |
2451337d | 1287 | return -EINVAL; |
1da177e4 LT |
1288 | } |
1289 | mp->m_sb.sb_rextslog = scounter; | |
014c2544 | 1290 | return 0; |
1da177e4 LT |
1291 | default: |
1292 | ASSERT(0); | |
2451337d | 1293 | return -EINVAL; |
1da177e4 LT |
1294 | } |
1295 | } | |
1296 | ||
1297 | /* | |
1298 | * xfs_mod_incore_sb() is used to change a field in the in-core | |
1299 | * superblock structure by the specified delta. This modification | |
3685c2a1 | 1300 | * is protected by the m_sb_lock. Just use the xfs_mod_incore_sb_unlocked() |
1da177e4 LT |
1301 | * routine to do the work. |
1302 | */ | |
1303 | int | |
20f4ebf2 | 1304 | xfs_mod_incore_sb( |
96540c78 CH |
1305 | struct xfs_mount *mp, |
1306 | xfs_sb_field_t field, | |
1307 | int64_t delta, | |
1308 | int rsvd) | |
1da177e4 | 1309 | { |
96540c78 | 1310 | int status; |
1da177e4 | 1311 | |
8d280b98 | 1312 | #ifdef HAVE_PERCPU_SB |
96540c78 | 1313 | ASSERT(field < XFS_SBS_ICOUNT || field > XFS_SBS_FDBLOCKS); |
8d280b98 | 1314 | #endif |
96540c78 CH |
1315 | spin_lock(&mp->m_sb_lock); |
1316 | status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); | |
1317 | spin_unlock(&mp->m_sb_lock); | |
8d280b98 | 1318 | |
014c2544 | 1319 | return status; |
1da177e4 LT |
1320 | } |
1321 | ||
1322 | /* | |
1b040712 | 1323 | * Change more than one field in the in-core superblock structure at a time. |
1da177e4 | 1324 | * |
1b040712 CH |
1325 | * The fields and changes to those fields are specified in the array of |
1326 | * xfs_mod_sb structures passed in. Either all of the specified deltas | |
1327 | * will be applied or none of them will. If any modified field dips below 0, | |
1328 | * then all modifications will be backed out and EINVAL will be returned. | |
1329 | * | |
1330 | * Note that this function may not be used for the superblock values that | |
1331 | * are tracked with the in-memory per-cpu counters - a direct call to | |
1332 | * xfs_icsb_modify_counters is required for these. | |
1da177e4 LT |
1333 | */ |
1334 | int | |
1b040712 CH |
1335 | xfs_mod_incore_sb_batch( |
1336 | struct xfs_mount *mp, | |
1337 | xfs_mod_sb_t *msb, | |
1338 | uint nmsb, | |
1339 | int rsvd) | |
1da177e4 | 1340 | { |
45c51b99 | 1341 | xfs_mod_sb_t *msbp; |
1b040712 | 1342 | int error = 0; |
1da177e4 LT |
1343 | |
1344 | /* | |
1b040712 CH |
1345 | * Loop through the array of mod structures and apply each individually. |
1346 | * If any fail, then back out all those which have already been applied. | |
1347 | * Do all of this within the scope of the m_sb_lock so that all of the | |
1348 | * changes will be atomic. | |
1da177e4 | 1349 | */ |
3685c2a1 | 1350 | spin_lock(&mp->m_sb_lock); |
45c51b99 | 1351 | for (msbp = msb; msbp < (msb + nmsb); msbp++) { |
1b040712 CH |
1352 | ASSERT(msbp->msb_field < XFS_SBS_ICOUNT || |
1353 | msbp->msb_field > XFS_SBS_FDBLOCKS); | |
8d280b98 | 1354 | |
1b040712 CH |
1355 | error = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field, |
1356 | msbp->msb_delta, rsvd); | |
1357 | if (error) | |
1358 | goto unwind; | |
1da177e4 | 1359 | } |
1b040712 CH |
1360 | spin_unlock(&mp->m_sb_lock); |
1361 | return 0; | |
1da177e4 | 1362 | |
1b040712 CH |
1363 | unwind: |
1364 | while (--msbp >= msb) { | |
1365 | error = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field, | |
1366 | -msbp->msb_delta, rsvd); | |
1367 | ASSERT(error == 0); | |
1da177e4 | 1368 | } |
3685c2a1 | 1369 | spin_unlock(&mp->m_sb_lock); |
1b040712 | 1370 | return error; |
1da177e4 LT |
1371 | } |
1372 | ||
1373 | /* | |
1374 | * xfs_getsb() is called to obtain the buffer for the superblock. | |
1375 | * The buffer is returned locked and read in from disk. | |
1376 | * The buffer should be released with a call to xfs_brelse(). | |
1377 | * | |
1378 | * If the flags parameter is BUF_TRYLOCK, then we'll only return | |
1379 | * the superblock buffer if it can be locked without sleeping. | |
1380 | * If it can't then we'll return NULL. | |
1381 | */ | |
0c842ad4 | 1382 | struct xfs_buf * |
1da177e4 | 1383 | xfs_getsb( |
0c842ad4 CH |
1384 | struct xfs_mount *mp, |
1385 | int flags) | |
1da177e4 | 1386 | { |
0c842ad4 | 1387 | struct xfs_buf *bp = mp->m_sb_bp; |
1da177e4 | 1388 | |
0c842ad4 CH |
1389 | if (!xfs_buf_trylock(bp)) { |
1390 | if (flags & XBF_TRYLOCK) | |
1da177e4 | 1391 | return NULL; |
0c842ad4 | 1392 | xfs_buf_lock(bp); |
1da177e4 | 1393 | } |
0c842ad4 | 1394 | |
72790aa1 | 1395 | xfs_buf_hold(bp); |
1da177e4 | 1396 | ASSERT(XFS_BUF_ISDONE(bp)); |
014c2544 | 1397 | return bp; |
1da177e4 LT |
1398 | } |
1399 | ||
1400 | /* | |
1401 | * Used to free the superblock along various error paths. | |
1402 | */ | |
1403 | void | |
1404 | xfs_freesb( | |
26af6552 | 1405 | struct xfs_mount *mp) |
1da177e4 | 1406 | { |
26af6552 | 1407 | struct xfs_buf *bp = mp->m_sb_bp; |
1da177e4 | 1408 | |
26af6552 | 1409 | xfs_buf_lock(bp); |
1da177e4 | 1410 | mp->m_sb_bp = NULL; |
26af6552 | 1411 | xfs_buf_relse(bp); |
1da177e4 LT |
1412 | } |
1413 | ||
1da177e4 LT |
1414 | /* |
1415 | * Used to log changes to the superblock unit and width fields which could | |
e6957ea4 ES |
1416 | * be altered by the mount options, as well as any potential sb_features2 |
1417 | * fixup. Only the first superblock is updated. | |
1da177e4 | 1418 | */ |
7884bc86 | 1419 | int |
ee1c0908 | 1420 | xfs_mount_log_sb( |
1da177e4 LT |
1421 | xfs_mount_t *mp, |
1422 | __int64_t fields) | |
1423 | { | |
1424 | xfs_trans_t *tp; | |
e5720eec | 1425 | int error; |
1da177e4 | 1426 | |
ee1c0908 | 1427 | ASSERT(fields & (XFS_SB_UNIT | XFS_SB_WIDTH | XFS_SB_UUID | |
4b166de0 DC |
1428 | XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2 | |
1429 | XFS_SB_VERSIONNUM)); | |
1da177e4 LT |
1430 | |
1431 | tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT); | |
3d3c8b52 | 1432 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0); |
e5720eec | 1433 | if (error) { |
1da177e4 | 1434 | xfs_trans_cancel(tp, 0); |
e5720eec | 1435 | return error; |
1da177e4 LT |
1436 | } |
1437 | xfs_mod_sb(tp, fields); | |
e5720eec DC |
1438 | error = xfs_trans_commit(tp, 0); |
1439 | return error; | |
1da177e4 | 1440 | } |
8d280b98 | 1441 | |
dda35b8f CH |
1442 | /* |
1443 | * If the underlying (data/log/rt) device is readonly, there are some | |
1444 | * operations that cannot proceed. | |
1445 | */ | |
1446 | int | |
1447 | xfs_dev_is_read_only( | |
1448 | struct xfs_mount *mp, | |
1449 | char *message) | |
1450 | { | |
1451 | if (xfs_readonly_buftarg(mp->m_ddev_targp) || | |
1452 | xfs_readonly_buftarg(mp->m_logdev_targp) || | |
1453 | (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) { | |
0b932ccc DC |
1454 | xfs_notice(mp, "%s required on read-only device.", message); |
1455 | xfs_notice(mp, "write access unavailable, cannot proceed."); | |
2451337d | 1456 | return -EROFS; |
dda35b8f CH |
1457 | } |
1458 | return 0; | |
1459 | } | |
8d280b98 DC |
1460 | |
1461 | #ifdef HAVE_PERCPU_SB | |
1462 | /* | |
1463 | * Per-cpu incore superblock counters | |
1464 | * | |
1465 | * Simple concept, difficult implementation | |
1466 | * | |
1467 | * Basically, replace the incore superblock counters with a distributed per cpu | |
1468 | * counter for contended fields (e.g. free block count). | |
1469 | * | |
1470 | * Difficulties arise in that the incore sb is used for ENOSPC checking, and | |
1471 | * hence needs to be accurately read when we are running low on space. Hence | |
1472 | * there is a method to enable and disable the per-cpu counters based on how | |
1473 | * much "stuff" is available in them. | |
1474 | * | |
1475 | * Basically, a counter is enabled if there is enough free resource to justify | |
1476 | * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local | |
1477 | * ENOSPC), then we disable the counters to synchronise all callers and | |
1478 | * re-distribute the available resources. | |
1479 | * | |
1480 | * If, once we redistributed the available resources, we still get a failure, | |
1481 | * we disable the per-cpu counter and go through the slow path. | |
1482 | * | |
1483 | * The slow path is the current xfs_mod_incore_sb() function. This means that | |
9da096fd | 1484 | * when we disable a per-cpu counter, we need to drain its resources back to |
8d280b98 DC |
1485 | * the global superblock. We do this after disabling the counter to prevent |
1486 | * more threads from queueing up on the counter. | |
1487 | * | |
1488 | * Essentially, this means that we still need a lock in the fast path to enable | |
1489 | * synchronisation between the global counters and the per-cpu counters. This | |
1490 | * is not a problem because the lock will be local to a CPU almost all the time | |
1491 | * and have little contention except when we get to ENOSPC conditions. | |
1492 | * | |
1493 | * Basically, this lock becomes a barrier that enables us to lock out the fast | |
1494 | * path while we do things like enabling and disabling counters and | |
1495 | * synchronising the counters. | |
1496 | * | |
1497 | * Locking rules: | |
1498 | * | |
3685c2a1 | 1499 | * 1. m_sb_lock before picking up per-cpu locks |
8d280b98 | 1500 | * 2. per-cpu locks always picked up via for_each_online_cpu() order |
3685c2a1 | 1501 | * 3. accurate counter sync requires m_sb_lock + per cpu locks |
8d280b98 | 1502 | * 4. modifying per-cpu counters requires holding per-cpu lock |
3685c2a1 ES |
1503 | * 5. modifying global counters requires holding m_sb_lock |
1504 | * 6. enabling or disabling a counter requires holding the m_sb_lock | |
8d280b98 DC |
1505 | * and _none_ of the per-cpu locks. |
1506 | * | |
1507 | * Disabled counters are only ever re-enabled by a balance operation | |
1508 | * that results in more free resources per CPU than a given threshold. | |
1509 | * To ensure counters don't remain disabled, they are rebalanced when | |
1510 | * the global resource goes above a higher threshold (i.e. some hysteresis | |
1511 | * is present to prevent thrashing). | |
e8234a68 DC |
1512 | */ |
1513 | ||
5a67e4c5 | 1514 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
1515 | /* |
1516 | * hot-plug CPU notifier support. | |
8d280b98 | 1517 | * |
5a67e4c5 CS |
1518 | * We need a notifier per filesystem as we need to be able to identify |
1519 | * the filesystem to balance the counters out. This is achieved by | |
1520 | * having a notifier block embedded in the xfs_mount_t and doing pointer | |
1521 | * magic to get the mount pointer from the notifier block address. | |
8d280b98 | 1522 | */ |
e8234a68 DC |
1523 | STATIC int |
1524 | xfs_icsb_cpu_notify( | |
1525 | struct notifier_block *nfb, | |
1526 | unsigned long action, | |
1527 | void *hcpu) | |
1528 | { | |
1529 | xfs_icsb_cnts_t *cntp; | |
1530 | xfs_mount_t *mp; | |
e8234a68 DC |
1531 | |
1532 | mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier); | |
1533 | cntp = (xfs_icsb_cnts_t *) | |
1534 | per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu); | |
1535 | switch (action) { | |
1536 | case CPU_UP_PREPARE: | |
8bb78442 | 1537 | case CPU_UP_PREPARE_FROZEN: |
e8234a68 DC |
1538 | /* Easy Case - initialize the area and locks, and |
1539 | * then rebalance when online does everything else for us. */ | |
01e1b69c | 1540 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 DC |
1541 | break; |
1542 | case CPU_ONLINE: | |
8bb78442 | 1543 | case CPU_ONLINE_FROZEN: |
03135cf7 | 1544 | xfs_icsb_lock(mp); |
45af6c6d CH |
1545 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0); |
1546 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0); | |
1547 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0); | |
03135cf7 | 1548 | xfs_icsb_unlock(mp); |
e8234a68 DC |
1549 | break; |
1550 | case CPU_DEAD: | |
8bb78442 | 1551 | case CPU_DEAD_FROZEN: |
e8234a68 DC |
1552 | /* Disable all the counters, then fold the dead cpu's |
1553 | * count into the total on the global superblock and | |
1554 | * re-enable the counters. */ | |
03135cf7 | 1555 | xfs_icsb_lock(mp); |
3685c2a1 | 1556 | spin_lock(&mp->m_sb_lock); |
e8234a68 DC |
1557 | xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT); |
1558 | xfs_icsb_disable_counter(mp, XFS_SBS_IFREE); | |
1559 | xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS); | |
1560 | ||
1561 | mp->m_sb.sb_icount += cntp->icsb_icount; | |
1562 | mp->m_sb.sb_ifree += cntp->icsb_ifree; | |
1563 | mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks; | |
1564 | ||
01e1b69c | 1565 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 | 1566 | |
45af6c6d CH |
1567 | xfs_icsb_balance_counter_locked(mp, XFS_SBS_ICOUNT, 0); |
1568 | xfs_icsb_balance_counter_locked(mp, XFS_SBS_IFREE, 0); | |
1569 | xfs_icsb_balance_counter_locked(mp, XFS_SBS_FDBLOCKS, 0); | |
3685c2a1 | 1570 | spin_unlock(&mp->m_sb_lock); |
03135cf7 | 1571 | xfs_icsb_unlock(mp); |
e8234a68 DC |
1572 | break; |
1573 | } | |
1574 | ||
1575 | return NOTIFY_OK; | |
1576 | } | |
5a67e4c5 | 1577 | #endif /* CONFIG_HOTPLUG_CPU */ |
e8234a68 | 1578 | |
8d280b98 DC |
1579 | int |
1580 | xfs_icsb_init_counters( | |
1581 | xfs_mount_t *mp) | |
1582 | { | |
1583 | xfs_icsb_cnts_t *cntp; | |
1584 | int i; | |
1585 | ||
1586 | mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t); | |
1587 | if (mp->m_sb_cnts == NULL) | |
1588 | return -ENOMEM; | |
1589 | ||
1590 | for_each_online_cpu(i) { | |
1591 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 1592 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
8d280b98 | 1593 | } |
20b64285 DC |
1594 | |
1595 | mutex_init(&mp->m_icsb_mutex); | |
1596 | ||
8d280b98 DC |
1597 | /* |
1598 | * start with all counters disabled so that the | |
1599 | * initial balance kicks us off correctly | |
1600 | */ | |
1601 | mp->m_icsb_counters = -1; | |
46677e67 RW |
1602 | |
1603 | #ifdef CONFIG_HOTPLUG_CPU | |
1604 | mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify; | |
1605 | mp->m_icsb_notifier.priority = 0; | |
1606 | register_hotcpu_notifier(&mp->m_icsb_notifier); | |
1607 | #endif /* CONFIG_HOTPLUG_CPU */ | |
1608 | ||
8d280b98 DC |
1609 | return 0; |
1610 | } | |
1611 | ||
5478eead LM |
1612 | void |
1613 | xfs_icsb_reinit_counters( | |
1614 | xfs_mount_t *mp) | |
1615 | { | |
1616 | xfs_icsb_lock(mp); | |
1617 | /* | |
1618 | * start with all counters disabled so that the | |
1619 | * initial balance kicks us off correctly | |
1620 | */ | |
1621 | mp->m_icsb_counters = -1; | |
45af6c6d CH |
1622 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0); |
1623 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0); | |
1624 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0); | |
5478eead LM |
1625 | xfs_icsb_unlock(mp); |
1626 | } | |
1627 | ||
c962fb79 | 1628 | void |
8d280b98 DC |
1629 | xfs_icsb_destroy_counters( |
1630 | xfs_mount_t *mp) | |
1631 | { | |
e8234a68 | 1632 | if (mp->m_sb_cnts) { |
5a67e4c5 | 1633 | unregister_hotcpu_notifier(&mp->m_icsb_notifier); |
8d280b98 | 1634 | free_percpu(mp->m_sb_cnts); |
e8234a68 | 1635 | } |
03135cf7 | 1636 | mutex_destroy(&mp->m_icsb_mutex); |
8d280b98 DC |
1637 | } |
1638 | ||
b8f82a4a | 1639 | STATIC void |
01e1b69c DC |
1640 | xfs_icsb_lock_cntr( |
1641 | xfs_icsb_cnts_t *icsbp) | |
1642 | { | |
1643 | while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) { | |
1644 | ndelay(1000); | |
1645 | } | |
1646 | } | |
1647 | ||
b8f82a4a | 1648 | STATIC void |
01e1b69c DC |
1649 | xfs_icsb_unlock_cntr( |
1650 | xfs_icsb_cnts_t *icsbp) | |
1651 | { | |
1652 | clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags); | |
1653 | } | |
1654 | ||
8d280b98 | 1655 | |
b8f82a4a | 1656 | STATIC void |
8d280b98 DC |
1657 | xfs_icsb_lock_all_counters( |
1658 | xfs_mount_t *mp) | |
1659 | { | |
1660 | xfs_icsb_cnts_t *cntp; | |
1661 | int i; | |
1662 | ||
1663 | for_each_online_cpu(i) { | |
1664 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 1665 | xfs_icsb_lock_cntr(cntp); |
8d280b98 DC |
1666 | } |
1667 | } | |
1668 | ||
b8f82a4a | 1669 | STATIC void |
8d280b98 DC |
1670 | xfs_icsb_unlock_all_counters( |
1671 | xfs_mount_t *mp) | |
1672 | { | |
1673 | xfs_icsb_cnts_t *cntp; | |
1674 | int i; | |
1675 | ||
1676 | for_each_online_cpu(i) { | |
1677 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 1678 | xfs_icsb_unlock_cntr(cntp); |
8d280b98 DC |
1679 | } |
1680 | } | |
1681 | ||
1682 | STATIC void | |
1683 | xfs_icsb_count( | |
1684 | xfs_mount_t *mp, | |
1685 | xfs_icsb_cnts_t *cnt, | |
1686 | int flags) | |
1687 | { | |
1688 | xfs_icsb_cnts_t *cntp; | |
1689 | int i; | |
1690 | ||
1691 | memset(cnt, 0, sizeof(xfs_icsb_cnts_t)); | |
1692 | ||
1693 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
1694 | xfs_icsb_lock_all_counters(mp); | |
1695 | ||
1696 | for_each_online_cpu(i) { | |
1697 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
1698 | cnt->icsb_icount += cntp->icsb_icount; | |
1699 | cnt->icsb_ifree += cntp->icsb_ifree; | |
1700 | cnt->icsb_fdblocks += cntp->icsb_fdblocks; | |
1701 | } | |
1702 | ||
1703 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
1704 | xfs_icsb_unlock_all_counters(mp); | |
1705 | } | |
1706 | ||
1707 | STATIC int | |
1708 | xfs_icsb_counter_disabled( | |
1709 | xfs_mount_t *mp, | |
1710 | xfs_sb_field_t field) | |
1711 | { | |
1712 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
1713 | return test_bit(field, &mp->m_icsb_counters); | |
1714 | } | |
1715 | ||
36fbe6e6 | 1716 | STATIC void |
8d280b98 DC |
1717 | xfs_icsb_disable_counter( |
1718 | xfs_mount_t *mp, | |
1719 | xfs_sb_field_t field) | |
1720 | { | |
1721 | xfs_icsb_cnts_t cnt; | |
1722 | ||
1723 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
1724 | ||
20b64285 DC |
1725 | /* |
1726 | * If we are already disabled, then there is nothing to do | |
1727 | * here. We check before locking all the counters to avoid | |
1728 | * the expensive lock operation when being called in the | |
1729 | * slow path and the counter is already disabled. This is | |
1730 | * safe because the only time we set or clear this state is under | |
1731 | * the m_icsb_mutex. | |
1732 | */ | |
1733 | if (xfs_icsb_counter_disabled(mp, field)) | |
36fbe6e6 | 1734 | return; |
20b64285 | 1735 | |
8d280b98 DC |
1736 | xfs_icsb_lock_all_counters(mp); |
1737 | if (!test_and_set_bit(field, &mp->m_icsb_counters)) { | |
1738 | /* drain back to superblock */ | |
1739 | ||
ce46193b | 1740 | xfs_icsb_count(mp, &cnt, XFS_ICSB_LAZY_COUNT); |
8d280b98 DC |
1741 | switch(field) { |
1742 | case XFS_SBS_ICOUNT: | |
1743 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
1744 | break; | |
1745 | case XFS_SBS_IFREE: | |
1746 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
1747 | break; | |
1748 | case XFS_SBS_FDBLOCKS: | |
1749 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
1750 | break; | |
1751 | default: | |
1752 | BUG(); | |
1753 | } | |
1754 | } | |
1755 | ||
1756 | xfs_icsb_unlock_all_counters(mp); | |
8d280b98 DC |
1757 | } |
1758 | ||
1759 | STATIC void | |
1760 | xfs_icsb_enable_counter( | |
1761 | xfs_mount_t *mp, | |
1762 | xfs_sb_field_t field, | |
1763 | uint64_t count, | |
1764 | uint64_t resid) | |
1765 | { | |
1766 | xfs_icsb_cnts_t *cntp; | |
1767 | int i; | |
1768 | ||
1769 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
1770 | ||
1771 | xfs_icsb_lock_all_counters(mp); | |
1772 | for_each_online_cpu(i) { | |
1773 | cntp = per_cpu_ptr(mp->m_sb_cnts, i); | |
1774 | switch (field) { | |
1775 | case XFS_SBS_ICOUNT: | |
1776 | cntp->icsb_icount = count + resid; | |
1777 | break; | |
1778 | case XFS_SBS_IFREE: | |
1779 | cntp->icsb_ifree = count + resid; | |
1780 | break; | |
1781 | case XFS_SBS_FDBLOCKS: | |
1782 | cntp->icsb_fdblocks = count + resid; | |
1783 | break; | |
1784 | default: | |
1785 | BUG(); | |
1786 | break; | |
1787 | } | |
1788 | resid = 0; | |
1789 | } | |
1790 | clear_bit(field, &mp->m_icsb_counters); | |
1791 | xfs_icsb_unlock_all_counters(mp); | |
1792 | } | |
1793 | ||
dbcabad1 | 1794 | void |
d4d90b57 | 1795 | xfs_icsb_sync_counters_locked( |
8d280b98 DC |
1796 | xfs_mount_t *mp, |
1797 | int flags) | |
1798 | { | |
1799 | xfs_icsb_cnts_t cnt; | |
8d280b98 | 1800 | |
8d280b98 DC |
1801 | xfs_icsb_count(mp, &cnt, flags); |
1802 | ||
8d280b98 DC |
1803 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT)) |
1804 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
1805 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE)) | |
1806 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
1807 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS)) | |
1808 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
8d280b98 DC |
1809 | } |
1810 | ||
1811 | /* | |
1812 | * Accurate update of per-cpu counters to incore superblock | |
1813 | */ | |
d4d90b57 | 1814 | void |
8d280b98 | 1815 | xfs_icsb_sync_counters( |
d4d90b57 CH |
1816 | xfs_mount_t *mp, |
1817 | int flags) | |
8d280b98 | 1818 | { |
d4d90b57 CH |
1819 | spin_lock(&mp->m_sb_lock); |
1820 | xfs_icsb_sync_counters_locked(mp, flags); | |
1821 | spin_unlock(&mp->m_sb_lock); | |
8d280b98 DC |
1822 | } |
1823 | ||
1824 | /* | |
1825 | * Balance and enable/disable counters as necessary. | |
1826 | * | |
20b64285 DC |
1827 | * Thresholds for re-enabling counters are somewhat magic. inode counts are |
1828 | * chosen to be the same number as single on disk allocation chunk per CPU, and | |
1829 | * free blocks is something far enough zero that we aren't going thrash when we | |
1830 | * get near ENOSPC. We also need to supply a minimum we require per cpu to | |
1831 | * prevent looping endlessly when xfs_alloc_space asks for more than will | |
1832 | * be distributed to a single CPU but each CPU has enough blocks to be | |
1833 | * reenabled. | |
1834 | * | |
1835 | * Note that we can be called when counters are already disabled. | |
1836 | * xfs_icsb_disable_counter() optimises the counter locking in this case to | |
1837 | * prevent locking every per-cpu counter needlessly. | |
8d280b98 | 1838 | */ |
20b64285 DC |
1839 | |
1840 | #define XFS_ICSB_INO_CNTR_REENABLE (uint64_t)64 | |
4be536de | 1841 | #define XFS_ICSB_FDBLK_CNTR_REENABLE(mp) \ |
20b64285 | 1842 | (uint64_t)(512 + XFS_ALLOC_SET_ASIDE(mp)) |
8d280b98 | 1843 | STATIC void |
45af6c6d | 1844 | xfs_icsb_balance_counter_locked( |
8d280b98 DC |
1845 | xfs_mount_t *mp, |
1846 | xfs_sb_field_t field, | |
20b64285 | 1847 | int min_per_cpu) |
8d280b98 | 1848 | { |
6fdf8ccc | 1849 | uint64_t count, resid; |
8d280b98 | 1850 | int weight = num_online_cpus(); |
20b64285 | 1851 | uint64_t min = (uint64_t)min_per_cpu; |
8d280b98 | 1852 | |
8d280b98 DC |
1853 | /* disable counter and sync counter */ |
1854 | xfs_icsb_disable_counter(mp, field); | |
1855 | ||
1856 | /* update counters - first CPU gets residual*/ | |
1857 | switch (field) { | |
1858 | case XFS_SBS_ICOUNT: | |
1859 | count = mp->m_sb.sb_icount; | |
1860 | resid = do_div(count, weight); | |
20b64285 | 1861 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
45af6c6d | 1862 | return; |
8d280b98 DC |
1863 | break; |
1864 | case XFS_SBS_IFREE: | |
1865 | count = mp->m_sb.sb_ifree; | |
1866 | resid = do_div(count, weight); | |
20b64285 | 1867 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
45af6c6d | 1868 | return; |
8d280b98 DC |
1869 | break; |
1870 | case XFS_SBS_FDBLOCKS: | |
1871 | count = mp->m_sb.sb_fdblocks; | |
1872 | resid = do_div(count, weight); | |
20b64285 | 1873 | if (count < max(min, XFS_ICSB_FDBLK_CNTR_REENABLE(mp))) |
45af6c6d | 1874 | return; |
8d280b98 DC |
1875 | break; |
1876 | default: | |
1877 | BUG(); | |
6fdf8ccc | 1878 | count = resid = 0; /* quiet, gcc */ |
8d280b98 DC |
1879 | break; |
1880 | } | |
1881 | ||
1882 | xfs_icsb_enable_counter(mp, field, count, resid); | |
45af6c6d CH |
1883 | } |
1884 | ||
1885 | STATIC void | |
1886 | xfs_icsb_balance_counter( | |
1887 | xfs_mount_t *mp, | |
1888 | xfs_sb_field_t fields, | |
1889 | int min_per_cpu) | |
1890 | { | |
1891 | spin_lock(&mp->m_sb_lock); | |
1892 | xfs_icsb_balance_counter_locked(mp, fields, min_per_cpu); | |
1893 | spin_unlock(&mp->m_sb_lock); | |
8d280b98 DC |
1894 | } |
1895 | ||
1b040712 | 1896 | int |
20b64285 | 1897 | xfs_icsb_modify_counters( |
8d280b98 DC |
1898 | xfs_mount_t *mp, |
1899 | xfs_sb_field_t field, | |
20f4ebf2 | 1900 | int64_t delta, |
20b64285 | 1901 | int rsvd) |
8d280b98 DC |
1902 | { |
1903 | xfs_icsb_cnts_t *icsbp; | |
1904 | long long lcounter; /* long counter for 64 bit fields */ | |
7a9e02d6 | 1905 | int ret = 0; |
8d280b98 | 1906 | |
20b64285 | 1907 | might_sleep(); |
8d280b98 | 1908 | again: |
7a9e02d6 CL |
1909 | preempt_disable(); |
1910 | icsbp = this_cpu_ptr(mp->m_sb_cnts); | |
20b64285 DC |
1911 | |
1912 | /* | |
1913 | * if the counter is disabled, go to slow path | |
1914 | */ | |
8d280b98 DC |
1915 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) |
1916 | goto slow_path; | |
20b64285 DC |
1917 | xfs_icsb_lock_cntr(icsbp); |
1918 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) { | |
1919 | xfs_icsb_unlock_cntr(icsbp); | |
1920 | goto slow_path; | |
1921 | } | |
8d280b98 DC |
1922 | |
1923 | switch (field) { | |
1924 | case XFS_SBS_ICOUNT: | |
1925 | lcounter = icsbp->icsb_icount; | |
1926 | lcounter += delta; | |
1927 | if (unlikely(lcounter < 0)) | |
20b64285 | 1928 | goto balance_counter; |
8d280b98 DC |
1929 | icsbp->icsb_icount = lcounter; |
1930 | break; | |
1931 | ||
1932 | case XFS_SBS_IFREE: | |
1933 | lcounter = icsbp->icsb_ifree; | |
1934 | lcounter += delta; | |
1935 | if (unlikely(lcounter < 0)) | |
20b64285 | 1936 | goto balance_counter; |
8d280b98 DC |
1937 | icsbp->icsb_ifree = lcounter; |
1938 | break; | |
1939 | ||
1940 | case XFS_SBS_FDBLOCKS: | |
1941 | BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0); | |
1942 | ||
4be536de | 1943 | lcounter = icsbp->icsb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
1944 | lcounter += delta; |
1945 | if (unlikely(lcounter < 0)) | |
20b64285 | 1946 | goto balance_counter; |
4be536de | 1947 | icsbp->icsb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
1948 | break; |
1949 | default: | |
1950 | BUG(); | |
1951 | break; | |
1952 | } | |
01e1b69c | 1953 | xfs_icsb_unlock_cntr(icsbp); |
7a9e02d6 | 1954 | preempt_enable(); |
8d280b98 DC |
1955 | return 0; |
1956 | ||
8d280b98 | 1957 | slow_path: |
7a9e02d6 | 1958 | preempt_enable(); |
8d280b98 | 1959 | |
20b64285 DC |
1960 | /* |
1961 | * serialise with a mutex so we don't burn lots of cpu on | |
1962 | * the superblock lock. We still need to hold the superblock | |
1963 | * lock, however, when we modify the global structures. | |
1964 | */ | |
03135cf7 | 1965 | xfs_icsb_lock(mp); |
20b64285 DC |
1966 | |
1967 | /* | |
1968 | * Now running atomically. | |
1969 | * | |
1970 | * If the counter is enabled, someone has beaten us to rebalancing. | |
1971 | * Drop the lock and try again in the fast path.... | |
1972 | */ | |
1973 | if (!(xfs_icsb_counter_disabled(mp, field))) { | |
03135cf7 | 1974 | xfs_icsb_unlock(mp); |
8d280b98 | 1975 | goto again; |
8d280b98 DC |
1976 | } |
1977 | ||
20b64285 DC |
1978 | /* |
1979 | * The counter is currently disabled. Because we are | |
1980 | * running atomically here, we know a rebalance cannot | |
1981 | * be in progress. Hence we can go straight to operating | |
1982 | * on the global superblock. We do not call xfs_mod_incore_sb() | |
3685c2a1 | 1983 | * here even though we need to get the m_sb_lock. Doing so |
20b64285 | 1984 | * will cause us to re-enter this function and deadlock. |
3685c2a1 | 1985 | * Hence we get the m_sb_lock ourselves and then call |
20b64285 DC |
1986 | * xfs_mod_incore_sb_unlocked() as the unlocked path operates |
1987 | * directly on the global counters. | |
1988 | */ | |
3685c2a1 | 1989 | spin_lock(&mp->m_sb_lock); |
8d280b98 | 1990 | ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); |
3685c2a1 | 1991 | spin_unlock(&mp->m_sb_lock); |
8d280b98 | 1992 | |
20b64285 DC |
1993 | /* |
1994 | * Now that we've modified the global superblock, we | |
1995 | * may be able to re-enable the distributed counters | |
1996 | * (e.g. lots of space just got freed). After that | |
1997 | * we are done. | |
1998 | */ | |
2451337d | 1999 | if (ret != -ENOSPC) |
45af6c6d | 2000 | xfs_icsb_balance_counter(mp, field, 0); |
03135cf7 | 2001 | xfs_icsb_unlock(mp); |
8d280b98 | 2002 | return ret; |
8d280b98 | 2003 | |
20b64285 DC |
2004 | balance_counter: |
2005 | xfs_icsb_unlock_cntr(icsbp); | |
7a9e02d6 | 2006 | preempt_enable(); |
8d280b98 | 2007 | |
20b64285 DC |
2008 | /* |
2009 | * We may have multiple threads here if multiple per-cpu | |
2010 | * counters run dry at the same time. This will mean we can | |
2011 | * do more balances than strictly necessary but it is not | |
2012 | * the common slowpath case. | |
2013 | */ | |
03135cf7 | 2014 | xfs_icsb_lock(mp); |
20b64285 DC |
2015 | |
2016 | /* | |
2017 | * running atomically. | |
2018 | * | |
2019 | * This will leave the counter in the correct state for future | |
2020 | * accesses. After the rebalance, we simply try again and our retry | |
2021 | * will either succeed through the fast path or slow path without | |
2022 | * another balance operation being required. | |
2023 | */ | |
45af6c6d | 2024 | xfs_icsb_balance_counter(mp, field, delta); |
03135cf7 | 2025 | xfs_icsb_unlock(mp); |
20b64285 | 2026 | goto again; |
8d280b98 | 2027 | } |
20b64285 | 2028 | |
8d280b98 | 2029 | #endif |