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" |
a4fbe6ab | 21 | #include "xfs_format.h" |
239880ef DC |
22 | #include "xfs_log_format.h" |
23 | #include "xfs_trans_resv.h" | |
a844f451 NS |
24 | #include "xfs_sb.h" |
25 | #include "xfs_ag.h" | |
1da177e4 LT |
26 | #include "xfs_mount.h" |
27 | #include "xfs_error.h" | |
239880ef DC |
28 | #include "xfs_trans.h" |
29 | #include "xfs_trans_priv.h" | |
30 | #include "xfs_log.h" | |
1da177e4 | 31 | #include "xfs_log_priv.h" |
1da177e4 | 32 | #include "xfs_log_recover.h" |
a844f451 | 33 | #include "xfs_inode.h" |
0b1b213f | 34 | #include "xfs_trace.h" |
f661f1e0 | 35 | #include "xfs_fsops.h" |
0e446be4 | 36 | #include "xfs_cksum.h" |
baff4e44 | 37 | #include "xfs_sysfs.h" |
1da177e4 | 38 | |
eb01c9cd | 39 | kmem_zone_t *xfs_log_ticket_zone; |
1da177e4 | 40 | |
1da177e4 | 41 | /* Local miscellaneous function prototypes */ |
ad223e60 MT |
42 | STATIC int |
43 | xlog_commit_record( | |
44 | struct xlog *log, | |
45 | struct xlog_ticket *ticket, | |
46 | struct xlog_in_core **iclog, | |
47 | xfs_lsn_t *commitlsnp); | |
48 | ||
9a8d2fdb MT |
49 | STATIC struct xlog * |
50 | xlog_alloc_log( | |
51 | struct xfs_mount *mp, | |
52 | struct xfs_buftarg *log_target, | |
53 | xfs_daddr_t blk_offset, | |
54 | int num_bblks); | |
ad223e60 MT |
55 | STATIC int |
56 | xlog_space_left( | |
57 | struct xlog *log, | |
58 | atomic64_t *head); | |
9a8d2fdb MT |
59 | STATIC int |
60 | xlog_sync( | |
61 | struct xlog *log, | |
62 | struct xlog_in_core *iclog); | |
63 | STATIC void | |
64 | xlog_dealloc_log( | |
65 | struct xlog *log); | |
1da177e4 LT |
66 | |
67 | /* local state machine functions */ | |
68 | STATIC void xlog_state_done_syncing(xlog_in_core_t *iclog, int); | |
9a8d2fdb MT |
69 | STATIC void |
70 | xlog_state_do_callback( | |
71 | struct xlog *log, | |
72 | int aborted, | |
73 | struct xlog_in_core *iclog); | |
74 | STATIC int | |
75 | xlog_state_get_iclog_space( | |
76 | struct xlog *log, | |
77 | int len, | |
78 | struct xlog_in_core **iclog, | |
79 | struct xlog_ticket *ticket, | |
80 | int *continued_write, | |
81 | int *logoffsetp); | |
82 | STATIC int | |
83 | xlog_state_release_iclog( | |
84 | struct xlog *log, | |
85 | struct xlog_in_core *iclog); | |
86 | STATIC void | |
87 | xlog_state_switch_iclogs( | |
88 | struct xlog *log, | |
89 | struct xlog_in_core *iclog, | |
90 | int eventual_size); | |
91 | STATIC void | |
92 | xlog_state_want_sync( | |
93 | struct xlog *log, | |
94 | struct xlog_in_core *iclog); | |
1da177e4 | 95 | |
ad223e60 MT |
96 | STATIC void |
97 | xlog_grant_push_ail( | |
9a8d2fdb MT |
98 | struct xlog *log, |
99 | int need_bytes); | |
100 | STATIC void | |
101 | xlog_regrant_reserve_log_space( | |
102 | struct xlog *log, | |
103 | struct xlog_ticket *ticket); | |
104 | STATIC void | |
105 | xlog_ungrant_log_space( | |
106 | struct xlog *log, | |
107 | struct xlog_ticket *ticket); | |
1da177e4 | 108 | |
cfcbbbd0 | 109 | #if defined(DEBUG) |
9a8d2fdb MT |
110 | STATIC void |
111 | xlog_verify_dest_ptr( | |
112 | struct xlog *log, | |
113 | char *ptr); | |
ad223e60 MT |
114 | STATIC void |
115 | xlog_verify_grant_tail( | |
9a8d2fdb MT |
116 | struct xlog *log); |
117 | STATIC void | |
118 | xlog_verify_iclog( | |
119 | struct xlog *log, | |
120 | struct xlog_in_core *iclog, | |
121 | int count, | |
667a9291 | 122 | bool syncing); |
9a8d2fdb MT |
123 | STATIC void |
124 | xlog_verify_tail_lsn( | |
125 | struct xlog *log, | |
126 | struct xlog_in_core *iclog, | |
127 | xfs_lsn_t tail_lsn); | |
1da177e4 LT |
128 | #else |
129 | #define xlog_verify_dest_ptr(a,b) | |
3f336c6f | 130 | #define xlog_verify_grant_tail(a) |
1da177e4 LT |
131 | #define xlog_verify_iclog(a,b,c,d) |
132 | #define xlog_verify_tail_lsn(a,b,c) | |
133 | #endif | |
134 | ||
9a8d2fdb MT |
135 | STATIC int |
136 | xlog_iclogs_empty( | |
137 | struct xlog *log); | |
1da177e4 | 138 | |
dd954c69 | 139 | static void |
663e496a | 140 | xlog_grant_sub_space( |
ad223e60 MT |
141 | struct xlog *log, |
142 | atomic64_t *head, | |
143 | int bytes) | |
dd954c69 | 144 | { |
d0eb2f38 DC |
145 | int64_t head_val = atomic64_read(head); |
146 | int64_t new, old; | |
a69ed03c | 147 | |
d0eb2f38 DC |
148 | do { |
149 | int cycle, space; | |
a69ed03c | 150 | |
d0eb2f38 | 151 | xlog_crack_grant_head_val(head_val, &cycle, &space); |
a69ed03c | 152 | |
d0eb2f38 DC |
153 | space -= bytes; |
154 | if (space < 0) { | |
155 | space += log->l_logsize; | |
156 | cycle--; | |
157 | } | |
158 | ||
159 | old = head_val; | |
160 | new = xlog_assign_grant_head_val(cycle, space); | |
161 | head_val = atomic64_cmpxchg(head, old, new); | |
162 | } while (head_val != old); | |
dd954c69 CH |
163 | } |
164 | ||
165 | static void | |
663e496a | 166 | xlog_grant_add_space( |
ad223e60 MT |
167 | struct xlog *log, |
168 | atomic64_t *head, | |
169 | int bytes) | |
dd954c69 | 170 | { |
d0eb2f38 DC |
171 | int64_t head_val = atomic64_read(head); |
172 | int64_t new, old; | |
a69ed03c | 173 | |
d0eb2f38 DC |
174 | do { |
175 | int tmp; | |
176 | int cycle, space; | |
a69ed03c | 177 | |
d0eb2f38 | 178 | xlog_crack_grant_head_val(head_val, &cycle, &space); |
a69ed03c | 179 | |
d0eb2f38 DC |
180 | tmp = log->l_logsize - space; |
181 | if (tmp > bytes) | |
182 | space += bytes; | |
183 | else { | |
184 | space = bytes - tmp; | |
185 | cycle++; | |
186 | } | |
187 | ||
188 | old = head_val; | |
189 | new = xlog_assign_grant_head_val(cycle, space); | |
190 | head_val = atomic64_cmpxchg(head, old, new); | |
191 | } while (head_val != old); | |
dd954c69 | 192 | } |
a69ed03c | 193 | |
c303c5b8 CH |
194 | STATIC void |
195 | xlog_grant_head_init( | |
196 | struct xlog_grant_head *head) | |
197 | { | |
198 | xlog_assign_grant_head(&head->grant, 1, 0); | |
199 | INIT_LIST_HEAD(&head->waiters); | |
200 | spin_lock_init(&head->lock); | |
201 | } | |
202 | ||
a79bf2d7 CH |
203 | STATIC void |
204 | xlog_grant_head_wake_all( | |
205 | struct xlog_grant_head *head) | |
206 | { | |
207 | struct xlog_ticket *tic; | |
208 | ||
209 | spin_lock(&head->lock); | |
210 | list_for_each_entry(tic, &head->waiters, t_queue) | |
211 | wake_up_process(tic->t_task); | |
212 | spin_unlock(&head->lock); | |
213 | } | |
214 | ||
e179840d CH |
215 | static inline int |
216 | xlog_ticket_reservation( | |
ad223e60 | 217 | struct xlog *log, |
e179840d CH |
218 | struct xlog_grant_head *head, |
219 | struct xlog_ticket *tic) | |
9f9c19ec | 220 | { |
e179840d CH |
221 | if (head == &log->l_write_head) { |
222 | ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); | |
223 | return tic->t_unit_res; | |
224 | } else { | |
9f9c19ec | 225 | if (tic->t_flags & XLOG_TIC_PERM_RESERV) |
e179840d | 226 | return tic->t_unit_res * tic->t_cnt; |
9f9c19ec | 227 | else |
e179840d | 228 | return tic->t_unit_res; |
9f9c19ec | 229 | } |
9f9c19ec CH |
230 | } |
231 | ||
232 | STATIC bool | |
e179840d | 233 | xlog_grant_head_wake( |
ad223e60 | 234 | struct xlog *log, |
e179840d | 235 | struct xlog_grant_head *head, |
9f9c19ec CH |
236 | int *free_bytes) |
237 | { | |
238 | struct xlog_ticket *tic; | |
239 | int need_bytes; | |
240 | ||
e179840d CH |
241 | list_for_each_entry(tic, &head->waiters, t_queue) { |
242 | need_bytes = xlog_ticket_reservation(log, head, tic); | |
9f9c19ec CH |
243 | if (*free_bytes < need_bytes) |
244 | return false; | |
9f9c19ec | 245 | |
e179840d CH |
246 | *free_bytes -= need_bytes; |
247 | trace_xfs_log_grant_wake_up(log, tic); | |
14a7235f | 248 | wake_up_process(tic->t_task); |
9f9c19ec CH |
249 | } |
250 | ||
251 | return true; | |
252 | } | |
253 | ||
254 | STATIC int | |
23ee3df3 | 255 | xlog_grant_head_wait( |
ad223e60 | 256 | struct xlog *log, |
23ee3df3 | 257 | struct xlog_grant_head *head, |
9f9c19ec | 258 | struct xlog_ticket *tic, |
a30b0367 DC |
259 | int need_bytes) __releases(&head->lock) |
260 | __acquires(&head->lock) | |
9f9c19ec | 261 | { |
23ee3df3 | 262 | list_add_tail(&tic->t_queue, &head->waiters); |
9f9c19ec CH |
263 | |
264 | do { | |
265 | if (XLOG_FORCED_SHUTDOWN(log)) | |
266 | goto shutdown; | |
267 | xlog_grant_push_ail(log, need_bytes); | |
268 | ||
14a7235f | 269 | __set_current_state(TASK_UNINTERRUPTIBLE); |
23ee3df3 | 270 | spin_unlock(&head->lock); |
14a7235f | 271 | |
9f9c19ec | 272 | XFS_STATS_INC(xs_sleep_logspace); |
9f9c19ec | 273 | |
14a7235f CH |
274 | trace_xfs_log_grant_sleep(log, tic); |
275 | schedule(); | |
9f9c19ec CH |
276 | trace_xfs_log_grant_wake(log, tic); |
277 | ||
23ee3df3 | 278 | spin_lock(&head->lock); |
9f9c19ec CH |
279 | if (XLOG_FORCED_SHUTDOWN(log)) |
280 | goto shutdown; | |
23ee3df3 | 281 | } while (xlog_space_left(log, &head->grant) < need_bytes); |
9f9c19ec CH |
282 | |
283 | list_del_init(&tic->t_queue); | |
284 | return 0; | |
285 | shutdown: | |
286 | list_del_init(&tic->t_queue); | |
2451337d | 287 | return -EIO; |
9f9c19ec CH |
288 | } |
289 | ||
42ceedb3 CH |
290 | /* |
291 | * Atomically get the log space required for a log ticket. | |
292 | * | |
293 | * Once a ticket gets put onto head->waiters, it will only return after the | |
294 | * needed reservation is satisfied. | |
295 | * | |
296 | * This function is structured so that it has a lock free fast path. This is | |
297 | * necessary because every new transaction reservation will come through this | |
298 | * path. Hence any lock will be globally hot if we take it unconditionally on | |
299 | * every pass. | |
300 | * | |
301 | * As tickets are only ever moved on and off head->waiters under head->lock, we | |
302 | * only need to take that lock if we are going to add the ticket to the queue | |
303 | * and sleep. We can avoid taking the lock if the ticket was never added to | |
304 | * head->waiters because the t_queue list head will be empty and we hold the | |
305 | * only reference to it so it can safely be checked unlocked. | |
306 | */ | |
307 | STATIC int | |
308 | xlog_grant_head_check( | |
ad223e60 | 309 | struct xlog *log, |
42ceedb3 CH |
310 | struct xlog_grant_head *head, |
311 | struct xlog_ticket *tic, | |
312 | int *need_bytes) | |
313 | { | |
314 | int free_bytes; | |
315 | int error = 0; | |
316 | ||
317 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); | |
318 | ||
319 | /* | |
320 | * If there are other waiters on the queue then give them a chance at | |
321 | * logspace before us. Wake up the first waiters, if we do not wake | |
322 | * up all the waiters then go to sleep waiting for more free space, | |
323 | * otherwise try to get some space for this transaction. | |
324 | */ | |
325 | *need_bytes = xlog_ticket_reservation(log, head, tic); | |
326 | free_bytes = xlog_space_left(log, &head->grant); | |
327 | if (!list_empty_careful(&head->waiters)) { | |
328 | spin_lock(&head->lock); | |
329 | if (!xlog_grant_head_wake(log, head, &free_bytes) || | |
330 | free_bytes < *need_bytes) { | |
331 | error = xlog_grant_head_wait(log, head, tic, | |
332 | *need_bytes); | |
333 | } | |
334 | spin_unlock(&head->lock); | |
335 | } else if (free_bytes < *need_bytes) { | |
336 | spin_lock(&head->lock); | |
337 | error = xlog_grant_head_wait(log, head, tic, *need_bytes); | |
338 | spin_unlock(&head->lock); | |
339 | } | |
340 | ||
341 | return error; | |
342 | } | |
343 | ||
0adba536 CH |
344 | static void |
345 | xlog_tic_reset_res(xlog_ticket_t *tic) | |
346 | { | |
347 | tic->t_res_num = 0; | |
348 | tic->t_res_arr_sum = 0; | |
349 | tic->t_res_num_ophdrs = 0; | |
350 | } | |
351 | ||
352 | static void | |
353 | xlog_tic_add_region(xlog_ticket_t *tic, uint len, uint type) | |
354 | { | |
355 | if (tic->t_res_num == XLOG_TIC_LEN_MAX) { | |
356 | /* add to overflow and start again */ | |
357 | tic->t_res_o_flow += tic->t_res_arr_sum; | |
358 | tic->t_res_num = 0; | |
359 | tic->t_res_arr_sum = 0; | |
360 | } | |
361 | ||
362 | tic->t_res_arr[tic->t_res_num].r_len = len; | |
363 | tic->t_res_arr[tic->t_res_num].r_type = type; | |
364 | tic->t_res_arr_sum += len; | |
365 | tic->t_res_num++; | |
366 | } | |
dd954c69 | 367 | |
9006fb91 CH |
368 | /* |
369 | * Replenish the byte reservation required by moving the grant write head. | |
370 | */ | |
371 | int | |
372 | xfs_log_regrant( | |
373 | struct xfs_mount *mp, | |
374 | struct xlog_ticket *tic) | |
375 | { | |
ad223e60 | 376 | struct xlog *log = mp->m_log; |
9006fb91 CH |
377 | int need_bytes; |
378 | int error = 0; | |
379 | ||
380 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2451337d | 381 | return -EIO; |
9006fb91 CH |
382 | |
383 | XFS_STATS_INC(xs_try_logspace); | |
384 | ||
385 | /* | |
386 | * This is a new transaction on the ticket, so we need to change the | |
387 | * transaction ID so that the next transaction has a different TID in | |
388 | * the log. Just add one to the existing tid so that we can see chains | |
389 | * of rolling transactions in the log easily. | |
390 | */ | |
391 | tic->t_tid++; | |
392 | ||
393 | xlog_grant_push_ail(log, tic->t_unit_res); | |
394 | ||
395 | tic->t_curr_res = tic->t_unit_res; | |
396 | xlog_tic_reset_res(tic); | |
397 | ||
398 | if (tic->t_cnt > 0) | |
399 | return 0; | |
400 | ||
401 | trace_xfs_log_regrant(log, tic); | |
402 | ||
403 | error = xlog_grant_head_check(log, &log->l_write_head, tic, | |
404 | &need_bytes); | |
405 | if (error) | |
406 | goto out_error; | |
407 | ||
408 | xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes); | |
409 | trace_xfs_log_regrant_exit(log, tic); | |
410 | xlog_verify_grant_tail(log); | |
411 | return 0; | |
412 | ||
413 | out_error: | |
414 | /* | |
415 | * If we are failing, make sure the ticket doesn't have any current | |
416 | * reservations. We don't want to add this back when the ticket/ | |
417 | * transaction gets cancelled. | |
418 | */ | |
419 | tic->t_curr_res = 0; | |
420 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
421 | return error; | |
422 | } | |
423 | ||
424 | /* | |
425 | * Reserve log space and return a ticket corresponding the reservation. | |
426 | * | |
427 | * Each reservation is going to reserve extra space for a log record header. | |
428 | * When writes happen to the on-disk log, we don't subtract the length of the | |
429 | * log record header from any reservation. By wasting space in each | |
430 | * reservation, we prevent over allocation problems. | |
431 | */ | |
432 | int | |
433 | xfs_log_reserve( | |
434 | struct xfs_mount *mp, | |
435 | int unit_bytes, | |
436 | int cnt, | |
437 | struct xlog_ticket **ticp, | |
438 | __uint8_t client, | |
439 | bool permanent, | |
440 | uint t_type) | |
441 | { | |
ad223e60 | 442 | struct xlog *log = mp->m_log; |
9006fb91 CH |
443 | struct xlog_ticket *tic; |
444 | int need_bytes; | |
445 | int error = 0; | |
446 | ||
447 | ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); | |
448 | ||
449 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2451337d | 450 | return -EIO; |
9006fb91 CH |
451 | |
452 | XFS_STATS_INC(xs_try_logspace); | |
453 | ||
454 | ASSERT(*ticp == NULL); | |
455 | tic = xlog_ticket_alloc(log, unit_bytes, cnt, client, permanent, | |
456 | KM_SLEEP | KM_MAYFAIL); | |
457 | if (!tic) | |
2451337d | 458 | return -ENOMEM; |
9006fb91 CH |
459 | |
460 | tic->t_trans_type = t_type; | |
461 | *ticp = tic; | |
462 | ||
437a255a DC |
463 | xlog_grant_push_ail(log, tic->t_cnt ? tic->t_unit_res * tic->t_cnt |
464 | : tic->t_unit_res); | |
9006fb91 CH |
465 | |
466 | trace_xfs_log_reserve(log, tic); | |
467 | ||
468 | error = xlog_grant_head_check(log, &log->l_reserve_head, tic, | |
469 | &need_bytes); | |
470 | if (error) | |
471 | goto out_error; | |
472 | ||
473 | xlog_grant_add_space(log, &log->l_reserve_head.grant, need_bytes); | |
474 | xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes); | |
475 | trace_xfs_log_reserve_exit(log, tic); | |
476 | xlog_verify_grant_tail(log); | |
477 | return 0; | |
478 | ||
479 | out_error: | |
480 | /* | |
481 | * If we are failing, make sure the ticket doesn't have any current | |
482 | * reservations. We don't want to add this back when the ticket/ | |
483 | * transaction gets cancelled. | |
484 | */ | |
485 | tic->t_curr_res = 0; | |
486 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
487 | return error; | |
488 | } | |
489 | ||
490 | ||
1da177e4 LT |
491 | /* |
492 | * NOTES: | |
493 | * | |
494 | * 1. currblock field gets updated at startup and after in-core logs | |
495 | * marked as with WANT_SYNC. | |
496 | */ | |
497 | ||
498 | /* | |
499 | * This routine is called when a user of a log manager ticket is done with | |
500 | * the reservation. If the ticket was ever used, then a commit record for | |
501 | * the associated transaction is written out as a log operation header with | |
502 | * no data. The flag XLOG_TIC_INITED is set when the first write occurs with | |
503 | * a given ticket. If the ticket was one with a permanent reservation, then | |
504 | * a few operations are done differently. Permanent reservation tickets by | |
505 | * default don't release the reservation. They just commit the current | |
506 | * transaction with the belief that the reservation is still needed. A flag | |
507 | * must be passed in before permanent reservations are actually released. | |
508 | * When these type of tickets are not released, they need to be set into | |
509 | * the inited state again. By doing this, a start record will be written | |
510 | * out when the next write occurs. | |
511 | */ | |
512 | xfs_lsn_t | |
35a8a72f CH |
513 | xfs_log_done( |
514 | struct xfs_mount *mp, | |
515 | struct xlog_ticket *ticket, | |
516 | struct xlog_in_core **iclog, | |
517 | uint flags) | |
1da177e4 | 518 | { |
ad223e60 | 519 | struct xlog *log = mp->m_log; |
35a8a72f | 520 | xfs_lsn_t lsn = 0; |
1da177e4 | 521 | |
1da177e4 LT |
522 | if (XLOG_FORCED_SHUTDOWN(log) || |
523 | /* | |
524 | * If nothing was ever written, don't write out commit record. | |
525 | * If we get an error, just continue and give back the log ticket. | |
526 | */ | |
527 | (((ticket->t_flags & XLOG_TIC_INITED) == 0) && | |
55b66332 | 528 | (xlog_commit_record(log, ticket, iclog, &lsn)))) { |
1da177e4 LT |
529 | lsn = (xfs_lsn_t) -1; |
530 | if (ticket->t_flags & XLOG_TIC_PERM_RESERV) { | |
531 | flags |= XFS_LOG_REL_PERM_RESERV; | |
532 | } | |
533 | } | |
534 | ||
535 | ||
536 | if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 || | |
537 | (flags & XFS_LOG_REL_PERM_RESERV)) { | |
0b1b213f CH |
538 | trace_xfs_log_done_nonperm(log, ticket); |
539 | ||
1da177e4 | 540 | /* |
c41564b5 | 541 | * Release ticket if not permanent reservation or a specific |
1da177e4 LT |
542 | * request has been made to release a permanent reservation. |
543 | */ | |
544 | xlog_ungrant_log_space(log, ticket); | |
cc09c0dc | 545 | xfs_log_ticket_put(ticket); |
1da177e4 | 546 | } else { |
0b1b213f CH |
547 | trace_xfs_log_done_perm(log, ticket); |
548 | ||
1da177e4 | 549 | xlog_regrant_reserve_log_space(log, ticket); |
c6a7b0f8 LM |
550 | /* If this ticket was a permanent reservation and we aren't |
551 | * trying to release it, reset the inited flags; so next time | |
552 | * we write, a start record will be written out. | |
553 | */ | |
1da177e4 | 554 | ticket->t_flags |= XLOG_TIC_INITED; |
c6a7b0f8 | 555 | } |
1da177e4 LT |
556 | |
557 | return lsn; | |
35a8a72f | 558 | } |
1da177e4 | 559 | |
1da177e4 LT |
560 | /* |
561 | * Attaches a new iclog I/O completion callback routine during | |
562 | * transaction commit. If the log is in error state, a non-zero | |
563 | * return code is handed back and the caller is responsible for | |
564 | * executing the callback at an appropriate time. | |
565 | */ | |
566 | int | |
35a8a72f CH |
567 | xfs_log_notify( |
568 | struct xfs_mount *mp, | |
569 | struct xlog_in_core *iclog, | |
570 | xfs_log_callback_t *cb) | |
1da177e4 | 571 | { |
b22cd72c | 572 | int abortflg; |
1da177e4 | 573 | |
114d23aa | 574 | spin_lock(&iclog->ic_callback_lock); |
1da177e4 LT |
575 | abortflg = (iclog->ic_state & XLOG_STATE_IOERROR); |
576 | if (!abortflg) { | |
577 | ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) || | |
578 | (iclog->ic_state == XLOG_STATE_WANT_SYNC)); | |
579 | cb->cb_next = NULL; | |
580 | *(iclog->ic_callback_tail) = cb; | |
581 | iclog->ic_callback_tail = &(cb->cb_next); | |
582 | } | |
114d23aa | 583 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 | 584 | return abortflg; |
35a8a72f | 585 | } |
1da177e4 LT |
586 | |
587 | int | |
35a8a72f CH |
588 | xfs_log_release_iclog( |
589 | struct xfs_mount *mp, | |
590 | struct xlog_in_core *iclog) | |
1da177e4 | 591 | { |
35a8a72f | 592 | if (xlog_state_release_iclog(mp->m_log, iclog)) { |
7d04a335 | 593 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
2451337d | 594 | return -EIO; |
1da177e4 LT |
595 | } |
596 | ||
597 | return 0; | |
598 | } | |
599 | ||
1da177e4 LT |
600 | /* |
601 | * Mount a log filesystem | |
602 | * | |
603 | * mp - ubiquitous xfs mount point structure | |
604 | * log_target - buftarg of on-disk log device | |
605 | * blk_offset - Start block # where block size is 512 bytes (BBSIZE) | |
606 | * num_bblocks - Number of BBSIZE blocks in on-disk log | |
607 | * | |
608 | * Return error or zero. | |
609 | */ | |
610 | int | |
249a8c11 DC |
611 | xfs_log_mount( |
612 | xfs_mount_t *mp, | |
613 | xfs_buftarg_t *log_target, | |
614 | xfs_daddr_t blk_offset, | |
615 | int num_bblks) | |
1da177e4 | 616 | { |
3e7b91cf JL |
617 | int error = 0; |
618 | int min_logfsbs; | |
249a8c11 | 619 | |
c99d609a DC |
620 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { |
621 | xfs_notice(mp, "Mounting V%d Filesystem", | |
622 | XFS_SB_VERSION_NUM(&mp->m_sb)); | |
623 | } else { | |
a0fa2b67 | 624 | xfs_notice(mp, |
c99d609a DC |
625 | "Mounting V%d filesystem in no-recovery mode. Filesystem will be inconsistent.", |
626 | XFS_SB_VERSION_NUM(&mp->m_sb)); | |
bd186aa9 | 627 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
628 | } |
629 | ||
630 | mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); | |
a6cb767e | 631 | if (IS_ERR(mp->m_log)) { |
2451337d | 632 | error = PTR_ERR(mp->m_log); |
644c3567 DC |
633 | goto out; |
634 | } | |
1da177e4 | 635 | |
3e7b91cf JL |
636 | /* |
637 | * Validate the given log space and drop a critical message via syslog | |
638 | * if the log size is too small that would lead to some unexpected | |
639 | * situations in transaction log space reservation stage. | |
640 | * | |
641 | * Note: we can't just reject the mount if the validation fails. This | |
642 | * would mean that people would have to downgrade their kernel just to | |
643 | * remedy the situation as there is no way to grow the log (short of | |
644 | * black magic surgery with xfs_db). | |
645 | * | |
646 | * We can, however, reject mounts for CRC format filesystems, as the | |
647 | * mkfs binary being used to make the filesystem should never create a | |
648 | * filesystem with a log that is too small. | |
649 | */ | |
650 | min_logfsbs = xfs_log_calc_minimum_size(mp); | |
651 | ||
652 | if (mp->m_sb.sb_logblocks < min_logfsbs) { | |
653 | xfs_warn(mp, | |
654 | "Log size %d blocks too small, minimum size is %d blocks", | |
655 | mp->m_sb.sb_logblocks, min_logfsbs); | |
2451337d | 656 | error = -EINVAL; |
3e7b91cf JL |
657 | } else if (mp->m_sb.sb_logblocks > XFS_MAX_LOG_BLOCKS) { |
658 | xfs_warn(mp, | |
659 | "Log size %d blocks too large, maximum size is %lld blocks", | |
660 | mp->m_sb.sb_logblocks, XFS_MAX_LOG_BLOCKS); | |
2451337d | 661 | error = -EINVAL; |
3e7b91cf JL |
662 | } else if (XFS_FSB_TO_B(mp, mp->m_sb.sb_logblocks) > XFS_MAX_LOG_BYTES) { |
663 | xfs_warn(mp, | |
664 | "log size %lld bytes too large, maximum size is %lld bytes", | |
665 | XFS_FSB_TO_B(mp, mp->m_sb.sb_logblocks), | |
666 | XFS_MAX_LOG_BYTES); | |
2451337d | 667 | error = -EINVAL; |
3e7b91cf JL |
668 | } |
669 | if (error) { | |
670 | if (xfs_sb_version_hascrc(&mp->m_sb)) { | |
671 | xfs_crit(mp, "AAIEEE! Log failed size checks. Abort!"); | |
672 | ASSERT(0); | |
673 | goto out_free_log; | |
674 | } | |
675 | xfs_crit(mp, | |
676 | "Log size out of supported range. Continuing onwards, but if log hangs are\n" | |
677 | "experienced then please report this message in the bug report."); | |
678 | } | |
679 | ||
249a8c11 DC |
680 | /* |
681 | * Initialize the AIL now we have a log. | |
682 | */ | |
249a8c11 DC |
683 | error = xfs_trans_ail_init(mp); |
684 | if (error) { | |
a0fa2b67 | 685 | xfs_warn(mp, "AIL initialisation failed: error %d", error); |
26430752 | 686 | goto out_free_log; |
249a8c11 | 687 | } |
a9c21c1b | 688 | mp->m_log->l_ailp = mp->m_ail; |
249a8c11 | 689 | |
1da177e4 LT |
690 | /* |
691 | * skip log recovery on a norecovery mount. pretend it all | |
692 | * just worked. | |
693 | */ | |
694 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { | |
249a8c11 | 695 | int readonly = (mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
696 | |
697 | if (readonly) | |
bd186aa9 | 698 | mp->m_flags &= ~XFS_MOUNT_RDONLY; |
1da177e4 | 699 | |
65be6054 | 700 | error = xlog_recover(mp->m_log); |
1da177e4 LT |
701 | |
702 | if (readonly) | |
bd186aa9 | 703 | mp->m_flags |= XFS_MOUNT_RDONLY; |
1da177e4 | 704 | if (error) { |
a0fa2b67 DC |
705 | xfs_warn(mp, "log mount/recovery failed: error %d", |
706 | error); | |
26430752 | 707 | goto out_destroy_ail; |
1da177e4 LT |
708 | } |
709 | } | |
710 | ||
baff4e44 BF |
711 | error = xfs_sysfs_init(&mp->m_log->l_kobj, &xfs_log_ktype, &mp->m_kobj, |
712 | "log"); | |
713 | if (error) | |
714 | goto out_destroy_ail; | |
715 | ||
1da177e4 LT |
716 | /* Normal transactions can now occur */ |
717 | mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; | |
718 | ||
71e330b5 DC |
719 | /* |
720 | * Now the log has been fully initialised and we know were our | |
721 | * space grant counters are, we can initialise the permanent ticket | |
722 | * needed for delayed logging to work. | |
723 | */ | |
724 | xlog_cil_init_post_recovery(mp->m_log); | |
725 | ||
1da177e4 | 726 | return 0; |
26430752 CH |
727 | |
728 | out_destroy_ail: | |
729 | xfs_trans_ail_destroy(mp); | |
730 | out_free_log: | |
731 | xlog_dealloc_log(mp->m_log); | |
644c3567 | 732 | out: |
249a8c11 | 733 | return error; |
26430752 | 734 | } |
1da177e4 LT |
735 | |
736 | /* | |
f661f1e0 DC |
737 | * Finish the recovery of the file system. This is separate from the |
738 | * xfs_log_mount() call, because it depends on the code in xfs_mountfs() to read | |
739 | * in the root and real-time bitmap inodes between calling xfs_log_mount() and | |
740 | * here. | |
1da177e4 | 741 | * |
f661f1e0 DC |
742 | * If we finish recovery successfully, start the background log work. If we are |
743 | * not doing recovery, then we have a RO filesystem and we don't need to start | |
744 | * it. | |
1da177e4 LT |
745 | */ |
746 | int | |
4249023a | 747 | xfs_log_mount_finish(xfs_mount_t *mp) |
1da177e4 | 748 | { |
f661f1e0 | 749 | int error = 0; |
1da177e4 | 750 | |
f661f1e0 | 751 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { |
4249023a | 752 | error = xlog_recover_finish(mp->m_log); |
f661f1e0 DC |
753 | if (!error) |
754 | xfs_log_work_queue(mp); | |
755 | } else { | |
bd186aa9 | 756 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
757 | } |
758 | ||
f661f1e0 | 759 | |
1da177e4 LT |
760 | return error; |
761 | } | |
762 | ||
1da177e4 LT |
763 | /* |
764 | * Final log writes as part of unmount. | |
765 | * | |
766 | * Mark the filesystem clean as unmount happens. Note that during relocation | |
767 | * this routine needs to be executed as part of source-bag while the | |
768 | * deallocation must not be done until source-end. | |
769 | */ | |
770 | ||
771 | /* | |
772 | * Unmount record used to have a string "Unmount filesystem--" in the | |
773 | * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE). | |
774 | * We just write the magic number now since that particular field isn't | |
8e159e72 | 775 | * currently architecture converted and "Unmount" is a bit foo. |
1da177e4 LT |
776 | * As far as I know, there weren't any dependencies on the old behaviour. |
777 | */ | |
778 | ||
779 | int | |
780 | xfs_log_unmount_write(xfs_mount_t *mp) | |
781 | { | |
9a8d2fdb | 782 | struct xlog *log = mp->m_log; |
1da177e4 LT |
783 | xlog_in_core_t *iclog; |
784 | #ifdef DEBUG | |
785 | xlog_in_core_t *first_iclog; | |
786 | #endif | |
35a8a72f | 787 | xlog_ticket_t *tic = NULL; |
1da177e4 LT |
788 | xfs_lsn_t lsn; |
789 | int error; | |
1da177e4 | 790 | |
1da177e4 LT |
791 | /* |
792 | * Don't write out unmount record on read-only mounts. | |
793 | * Or, if we are doing a forced umount (typically because of IO errors). | |
794 | */ | |
bd186aa9 | 795 | if (mp->m_flags & XFS_MOUNT_RDONLY) |
1da177e4 LT |
796 | return 0; |
797 | ||
a14a348b | 798 | error = _xfs_log_force(mp, XFS_LOG_SYNC, NULL); |
b911ca04 | 799 | ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log))); |
1da177e4 LT |
800 | |
801 | #ifdef DEBUG | |
802 | first_iclog = iclog = log->l_iclog; | |
803 | do { | |
804 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
805 | ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE); | |
806 | ASSERT(iclog->ic_offset == 0); | |
807 | } | |
808 | iclog = iclog->ic_next; | |
809 | } while (iclog != first_iclog); | |
810 | #endif | |
811 | if (! (XLOG_FORCED_SHUTDOWN(log))) { | |
955e47ad TS |
812 | error = xfs_log_reserve(mp, 600, 1, &tic, |
813 | XFS_LOG, 0, XLOG_UNMOUNT_REC_TYPE); | |
1da177e4 | 814 | if (!error) { |
55b66332 DC |
815 | /* the data section must be 32 bit size aligned */ |
816 | struct { | |
817 | __uint16_t magic; | |
818 | __uint16_t pad1; | |
819 | __uint32_t pad2; /* may as well make it 64 bits */ | |
820 | } magic = { | |
821 | .magic = XLOG_UNMOUNT_TYPE, | |
822 | }; | |
823 | struct xfs_log_iovec reg = { | |
4e0d5f92 | 824 | .i_addr = &magic, |
55b66332 DC |
825 | .i_len = sizeof(magic), |
826 | .i_type = XLOG_REG_TYPE_UNMOUNT, | |
827 | }; | |
828 | struct xfs_log_vec vec = { | |
829 | .lv_niovecs = 1, | |
830 | .lv_iovecp = ®, | |
831 | }; | |
832 | ||
3948659e | 833 | /* remove inited flag, and account for space used */ |
55b66332 | 834 | tic->t_flags = 0; |
3948659e | 835 | tic->t_curr_res -= sizeof(magic); |
55b66332 | 836 | error = xlog_write(log, &vec, tic, &lsn, |
1da177e4 LT |
837 | NULL, XLOG_UNMOUNT_TRANS); |
838 | /* | |
839 | * At this point, we're umounting anyway, | |
840 | * so there's no point in transitioning log state | |
841 | * to IOERROR. Just continue... | |
842 | */ | |
843 | } | |
844 | ||
a0fa2b67 DC |
845 | if (error) |
846 | xfs_alert(mp, "%s: unmount record failed", __func__); | |
1da177e4 LT |
847 | |
848 | ||
b22cd72c | 849 | spin_lock(&log->l_icloglock); |
1da177e4 | 850 | iclog = log->l_iclog; |
155cc6b7 | 851 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 | 852 | xlog_state_want_sync(log, iclog); |
39e2defe | 853 | spin_unlock(&log->l_icloglock); |
1bb7d6b5 | 854 | error = xlog_state_release_iclog(log, iclog); |
1da177e4 | 855 | |
b22cd72c | 856 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
857 | if (!(iclog->ic_state == XLOG_STATE_ACTIVE || |
858 | iclog->ic_state == XLOG_STATE_DIRTY)) { | |
859 | if (!XLOG_FORCED_SHUTDOWN(log)) { | |
eb40a875 DC |
860 | xlog_wait(&iclog->ic_force_wait, |
861 | &log->l_icloglock); | |
1da177e4 | 862 | } else { |
b22cd72c | 863 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
864 | } |
865 | } else { | |
b22cd72c | 866 | spin_unlock(&log->l_icloglock); |
1da177e4 | 867 | } |
955e47ad | 868 | if (tic) { |
0b1b213f | 869 | trace_xfs_log_umount_write(log, tic); |
955e47ad | 870 | xlog_ungrant_log_space(log, tic); |
cc09c0dc | 871 | xfs_log_ticket_put(tic); |
955e47ad | 872 | } |
1da177e4 LT |
873 | } else { |
874 | /* | |
875 | * We're already in forced_shutdown mode, couldn't | |
876 | * even attempt to write out the unmount transaction. | |
877 | * | |
878 | * Go through the motions of sync'ing and releasing | |
879 | * the iclog, even though no I/O will actually happen, | |
c41564b5 | 880 | * we need to wait for other log I/Os that may already |
1da177e4 LT |
881 | * be in progress. Do this as a separate section of |
882 | * code so we'll know if we ever get stuck here that | |
883 | * we're in this odd situation of trying to unmount | |
884 | * a file system that went into forced_shutdown as | |
885 | * the result of an unmount.. | |
886 | */ | |
b22cd72c | 887 | spin_lock(&log->l_icloglock); |
1da177e4 | 888 | iclog = log->l_iclog; |
155cc6b7 | 889 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 LT |
890 | |
891 | xlog_state_want_sync(log, iclog); | |
39e2defe | 892 | spin_unlock(&log->l_icloglock); |
1bb7d6b5 | 893 | error = xlog_state_release_iclog(log, iclog); |
1da177e4 | 894 | |
b22cd72c | 895 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
896 | |
897 | if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE | |
898 | || iclog->ic_state == XLOG_STATE_DIRTY | |
899 | || iclog->ic_state == XLOG_STATE_IOERROR) ) { | |
900 | ||
eb40a875 DC |
901 | xlog_wait(&iclog->ic_force_wait, |
902 | &log->l_icloglock); | |
1da177e4 | 903 | } else { |
b22cd72c | 904 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
905 | } |
906 | } | |
907 | ||
1bb7d6b5 | 908 | return error; |
1da177e4 LT |
909 | } /* xfs_log_unmount_write */ |
910 | ||
911 | /* | |
c75921a7 | 912 | * Empty the log for unmount/freeze. |
cf2931db DC |
913 | * |
914 | * To do this, we first need to shut down the background log work so it is not | |
915 | * trying to cover the log as we clean up. We then need to unpin all objects in | |
916 | * the log so we can then flush them out. Once they have completed their IO and | |
917 | * run the callbacks removing themselves from the AIL, we can write the unmount | |
c75921a7 | 918 | * record. |
1da177e4 LT |
919 | */ |
920 | void | |
c75921a7 DC |
921 | xfs_log_quiesce( |
922 | struct xfs_mount *mp) | |
1da177e4 | 923 | { |
f661f1e0 | 924 | cancel_delayed_work_sync(&mp->m_log->l_work); |
cf2931db DC |
925 | xfs_log_force(mp, XFS_LOG_SYNC); |
926 | ||
927 | /* | |
928 | * The superblock buffer is uncached and while xfs_ail_push_all_sync() | |
929 | * will push it, xfs_wait_buftarg() will not wait for it. Further, | |
930 | * xfs_buf_iowait() cannot be used because it was pushed with the | |
931 | * XBF_ASYNC flag set, so we need to use a lock/unlock pair to wait for | |
932 | * the IO to complete. | |
933 | */ | |
934 | xfs_ail_push_all_sync(mp->m_ail); | |
935 | xfs_wait_buftarg(mp->m_ddev_targp); | |
936 | xfs_buf_lock(mp->m_sb_bp); | |
937 | xfs_buf_unlock(mp->m_sb_bp); | |
938 | ||
939 | xfs_log_unmount_write(mp); | |
c75921a7 DC |
940 | } |
941 | ||
942 | /* | |
943 | * Shut down and release the AIL and Log. | |
944 | * | |
945 | * During unmount, we need to ensure we flush all the dirty metadata objects | |
946 | * from the AIL so that the log is empty before we write the unmount record to | |
947 | * the log. Once this is done, we can tear down the AIL and the log. | |
948 | */ | |
949 | void | |
950 | xfs_log_unmount( | |
951 | struct xfs_mount *mp) | |
952 | { | |
953 | xfs_log_quiesce(mp); | |
cf2931db | 954 | |
249a8c11 | 955 | xfs_trans_ail_destroy(mp); |
baff4e44 BF |
956 | |
957 | xfs_sysfs_del(&mp->m_log->l_kobj); | |
958 | ||
c41564b5 | 959 | xlog_dealloc_log(mp->m_log); |
1da177e4 LT |
960 | } |
961 | ||
43f5efc5 DC |
962 | void |
963 | xfs_log_item_init( | |
964 | struct xfs_mount *mp, | |
965 | struct xfs_log_item *item, | |
966 | int type, | |
272e42b2 | 967 | const struct xfs_item_ops *ops) |
43f5efc5 DC |
968 | { |
969 | item->li_mountp = mp; | |
970 | item->li_ailp = mp->m_ail; | |
971 | item->li_type = type; | |
972 | item->li_ops = ops; | |
71e330b5 DC |
973 | item->li_lv = NULL; |
974 | ||
975 | INIT_LIST_HEAD(&item->li_ail); | |
976 | INIT_LIST_HEAD(&item->li_cil); | |
43f5efc5 DC |
977 | } |
978 | ||
09a423a3 CH |
979 | /* |
980 | * Wake up processes waiting for log space after we have moved the log tail. | |
09a423a3 | 981 | */ |
1da177e4 | 982 | void |
09a423a3 | 983 | xfs_log_space_wake( |
cfb7cdca | 984 | struct xfs_mount *mp) |
1da177e4 | 985 | { |
ad223e60 | 986 | struct xlog *log = mp->m_log; |
cfb7cdca | 987 | int free_bytes; |
1da177e4 | 988 | |
1da177e4 LT |
989 | if (XLOG_FORCED_SHUTDOWN(log)) |
990 | return; | |
1da177e4 | 991 | |
28496968 | 992 | if (!list_empty_careful(&log->l_write_head.waiters)) { |
09a423a3 CH |
993 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); |
994 | ||
28496968 CH |
995 | spin_lock(&log->l_write_head.lock); |
996 | free_bytes = xlog_space_left(log, &log->l_write_head.grant); | |
e179840d | 997 | xlog_grant_head_wake(log, &log->l_write_head, &free_bytes); |
28496968 | 998 | spin_unlock(&log->l_write_head.lock); |
1da177e4 | 999 | } |
10547941 | 1000 | |
28496968 | 1001 | if (!list_empty_careful(&log->l_reserve_head.waiters)) { |
09a423a3 CH |
1002 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); |
1003 | ||
28496968 CH |
1004 | spin_lock(&log->l_reserve_head.lock); |
1005 | free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); | |
e179840d | 1006 | xlog_grant_head_wake(log, &log->l_reserve_head, &free_bytes); |
28496968 | 1007 | spin_unlock(&log->l_reserve_head.lock); |
1da177e4 | 1008 | } |
3f16b985 | 1009 | } |
1da177e4 LT |
1010 | |
1011 | /* | |
2c6e24ce DC |
1012 | * Determine if we have a transaction that has gone to disk that needs to be |
1013 | * covered. To begin the transition to the idle state firstly the log needs to | |
1014 | * be idle. That means the CIL, the AIL and the iclogs needs to be empty before | |
1015 | * we start attempting to cover the log. | |
b6f8dd49 | 1016 | * |
2c6e24ce DC |
1017 | * Only if we are then in a state where covering is needed, the caller is |
1018 | * informed that dummy transactions are required to move the log into the idle | |
1019 | * state. | |
1020 | * | |
1021 | * If there are any items in the AIl or CIL, then we do not want to attempt to | |
1022 | * cover the log as we may be in a situation where there isn't log space | |
1023 | * available to run a dummy transaction and this can lead to deadlocks when the | |
1024 | * tail of the log is pinned by an item that is modified in the CIL. Hence | |
1025 | * there's no point in running a dummy transaction at this point because we | |
1026 | * can't start trying to idle the log until both the CIL and AIL are empty. | |
1da177e4 LT |
1027 | */ |
1028 | int | |
1029 | xfs_log_need_covered(xfs_mount_t *mp) | |
1030 | { | |
9a8d2fdb | 1031 | struct xlog *log = mp->m_log; |
2c6e24ce | 1032 | int needed = 0; |
1da177e4 | 1033 | |
92821e2b | 1034 | if (!xfs_fs_writable(mp)) |
1da177e4 LT |
1035 | return 0; |
1036 | ||
2c6e24ce DC |
1037 | if (!xlog_cil_empty(log)) |
1038 | return 0; | |
1039 | ||
b22cd72c | 1040 | spin_lock(&log->l_icloglock); |
b6f8dd49 DC |
1041 | switch (log->l_covered_state) { |
1042 | case XLOG_STATE_COVER_DONE: | |
1043 | case XLOG_STATE_COVER_DONE2: | |
1044 | case XLOG_STATE_COVER_IDLE: | |
1045 | break; | |
1046 | case XLOG_STATE_COVER_NEED: | |
1047 | case XLOG_STATE_COVER_NEED2: | |
2c6e24ce DC |
1048 | if (xfs_ail_min_lsn(log->l_ailp)) |
1049 | break; | |
1050 | if (!xlog_iclogs_empty(log)) | |
1051 | break; | |
1052 | ||
1053 | needed = 1; | |
1054 | if (log->l_covered_state == XLOG_STATE_COVER_NEED) | |
1055 | log->l_covered_state = XLOG_STATE_COVER_DONE; | |
1056 | else | |
1057 | log->l_covered_state = XLOG_STATE_COVER_DONE2; | |
1058 | break; | |
b6f8dd49 | 1059 | default: |
1da177e4 | 1060 | needed = 1; |
b6f8dd49 | 1061 | break; |
1da177e4 | 1062 | } |
b22cd72c | 1063 | spin_unlock(&log->l_icloglock); |
014c2544 | 1064 | return needed; |
1da177e4 LT |
1065 | } |
1066 | ||
09a423a3 | 1067 | /* |
1da177e4 LT |
1068 | * We may be holding the log iclog lock upon entering this routine. |
1069 | */ | |
1070 | xfs_lsn_t | |
1c304625 | 1071 | xlog_assign_tail_lsn_locked( |
1c3cb9ec | 1072 | struct xfs_mount *mp) |
1da177e4 | 1073 | { |
ad223e60 | 1074 | struct xlog *log = mp->m_log; |
1c304625 CH |
1075 | struct xfs_log_item *lip; |
1076 | xfs_lsn_t tail_lsn; | |
1077 | ||
1078 | assert_spin_locked(&mp->m_ail->xa_lock); | |
1da177e4 | 1079 | |
09a423a3 CH |
1080 | /* |
1081 | * To make sure we always have a valid LSN for the log tail we keep | |
1082 | * track of the last LSN which was committed in log->l_last_sync_lsn, | |
1c304625 | 1083 | * and use that when the AIL was empty. |
09a423a3 | 1084 | */ |
1c304625 CH |
1085 | lip = xfs_ail_min(mp->m_ail); |
1086 | if (lip) | |
1087 | tail_lsn = lip->li_lsn; | |
1088 | else | |
84f3c683 | 1089 | tail_lsn = atomic64_read(&log->l_last_sync_lsn); |
750b9c90 | 1090 | trace_xfs_log_assign_tail_lsn(log, tail_lsn); |
1c3cb9ec | 1091 | atomic64_set(&log->l_tail_lsn, tail_lsn); |
1da177e4 | 1092 | return tail_lsn; |
1c3cb9ec | 1093 | } |
1da177e4 | 1094 | |
1c304625 CH |
1095 | xfs_lsn_t |
1096 | xlog_assign_tail_lsn( | |
1097 | struct xfs_mount *mp) | |
1098 | { | |
1099 | xfs_lsn_t tail_lsn; | |
1100 | ||
1101 | spin_lock(&mp->m_ail->xa_lock); | |
1102 | tail_lsn = xlog_assign_tail_lsn_locked(mp); | |
1103 | spin_unlock(&mp->m_ail->xa_lock); | |
1104 | ||
1105 | return tail_lsn; | |
1106 | } | |
1107 | ||
1da177e4 LT |
1108 | /* |
1109 | * Return the space in the log between the tail and the head. The head | |
1110 | * is passed in the cycle/bytes formal parms. In the special case where | |
1111 | * the reserve head has wrapped passed the tail, this calculation is no | |
1112 | * longer valid. In this case, just return 0 which means there is no space | |
1113 | * in the log. This works for all places where this function is called | |
1114 | * with the reserve head. Of course, if the write head were to ever | |
1115 | * wrap the tail, we should blow up. Rather than catch this case here, | |
1116 | * we depend on other ASSERTions in other parts of the code. XXXmiken | |
1117 | * | |
1118 | * This code also handles the case where the reservation head is behind | |
1119 | * the tail. The details of this case are described below, but the end | |
1120 | * result is that we return the size of the log as the amount of space left. | |
1121 | */ | |
a8272ce0 | 1122 | STATIC int |
a69ed03c | 1123 | xlog_space_left( |
ad223e60 | 1124 | struct xlog *log, |
c8a09ff8 | 1125 | atomic64_t *head) |
1da177e4 | 1126 | { |
a69ed03c DC |
1127 | int free_bytes; |
1128 | int tail_bytes; | |
1129 | int tail_cycle; | |
1130 | int head_cycle; | |
1131 | int head_bytes; | |
1da177e4 | 1132 | |
a69ed03c | 1133 | xlog_crack_grant_head(head, &head_cycle, &head_bytes); |
1c3cb9ec DC |
1134 | xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_bytes); |
1135 | tail_bytes = BBTOB(tail_bytes); | |
a69ed03c DC |
1136 | if (tail_cycle == head_cycle && head_bytes >= tail_bytes) |
1137 | free_bytes = log->l_logsize - (head_bytes - tail_bytes); | |
1138 | else if (tail_cycle + 1 < head_cycle) | |
1da177e4 | 1139 | return 0; |
a69ed03c DC |
1140 | else if (tail_cycle < head_cycle) { |
1141 | ASSERT(tail_cycle == (head_cycle - 1)); | |
1142 | free_bytes = tail_bytes - head_bytes; | |
1da177e4 LT |
1143 | } else { |
1144 | /* | |
1145 | * The reservation head is behind the tail. | |
1146 | * In this case we just want to return the size of the | |
1147 | * log as the amount of space left. | |
1148 | */ | |
a0fa2b67 | 1149 | xfs_alert(log->l_mp, |
1da177e4 LT |
1150 | "xlog_space_left: head behind tail\n" |
1151 | " tail_cycle = %d, tail_bytes = %d\n" | |
1152 | " GH cycle = %d, GH bytes = %d", | |
a69ed03c | 1153 | tail_cycle, tail_bytes, head_cycle, head_bytes); |
1da177e4 LT |
1154 | ASSERT(0); |
1155 | free_bytes = log->l_logsize; | |
1156 | } | |
1157 | return free_bytes; | |
a69ed03c | 1158 | } |
1da177e4 LT |
1159 | |
1160 | ||
1161 | /* | |
1162 | * Log function which is called when an io completes. | |
1163 | * | |
1164 | * The log manager needs its own routine, in order to control what | |
1165 | * happens with the buffer after the write completes. | |
1166 | */ | |
1167 | void | |
1168 | xlog_iodone(xfs_buf_t *bp) | |
1169 | { | |
9a8d2fdb MT |
1170 | struct xlog_in_core *iclog = bp->b_fspriv; |
1171 | struct xlog *l = iclog->ic_log; | |
1172 | int aborted = 0; | |
1da177e4 LT |
1173 | |
1174 | /* | |
1175 | * Race to shutdown the filesystem if we see an error. | |
1176 | */ | |
36de9556 | 1177 | if (XFS_TEST_ERROR(bp->b_error, l->l_mp, |
1da177e4 | 1178 | XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) { |
901796af | 1179 | xfs_buf_ioerror_alert(bp, __func__); |
c867cb61 | 1180 | xfs_buf_stale(bp); |
7d04a335 | 1181 | xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR); |
1da177e4 LT |
1182 | /* |
1183 | * This flag will be propagated to the trans-committed | |
1184 | * callback routines to let them know that the log-commit | |
1185 | * didn't succeed. | |
1186 | */ | |
1187 | aborted = XFS_LI_ABORTED; | |
1188 | } else if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
1189 | aborted = XFS_LI_ABORTED; | |
1190 | } | |
3db296f3 DC |
1191 | |
1192 | /* log I/O is always issued ASYNC */ | |
1193 | ASSERT(XFS_BUF_ISASYNC(bp)); | |
1da177e4 | 1194 | xlog_state_done_syncing(iclog, aborted); |
9c23eccc | 1195 | |
3db296f3 | 1196 | /* |
9c23eccc DC |
1197 | * drop the buffer lock now that we are done. Nothing references |
1198 | * the buffer after this, so an unmount waiting on this lock can now | |
1199 | * tear it down safely. As such, it is unsafe to reference the buffer | |
1200 | * (bp) after the unlock as we could race with it being freed. | |
3db296f3 | 1201 | */ |
9c23eccc | 1202 | xfs_buf_unlock(bp); |
c3f8fc73 | 1203 | } |
1da177e4 | 1204 | |
1da177e4 LT |
1205 | /* |
1206 | * Return size of each in-core log record buffer. | |
1207 | * | |
9da096fd | 1208 | * All machines get 8 x 32kB buffers by default, unless tuned otherwise. |
1da177e4 LT |
1209 | * |
1210 | * If the filesystem blocksize is too large, we may need to choose a | |
1211 | * larger size since the directory code currently logs entire blocks. | |
1212 | */ | |
1213 | ||
1214 | STATIC void | |
9a8d2fdb MT |
1215 | xlog_get_iclog_buffer_size( |
1216 | struct xfs_mount *mp, | |
1217 | struct xlog *log) | |
1da177e4 LT |
1218 | { |
1219 | int size; | |
1220 | int xhdrs; | |
1221 | ||
1cb51258 ES |
1222 | if (mp->m_logbufs <= 0) |
1223 | log->l_iclog_bufs = XLOG_MAX_ICLOGS; | |
1224 | else | |
cfcbbbd0 | 1225 | log->l_iclog_bufs = mp->m_logbufs; |
1da177e4 LT |
1226 | |
1227 | /* | |
1228 | * Buffer size passed in from mount system call. | |
1229 | */ | |
cfcbbbd0 | 1230 | if (mp->m_logbsize > 0) { |
1da177e4 LT |
1231 | size = log->l_iclog_size = mp->m_logbsize; |
1232 | log->l_iclog_size_log = 0; | |
1233 | while (size != 1) { | |
1234 | log->l_iclog_size_log++; | |
1235 | size >>= 1; | |
1236 | } | |
1237 | ||
62118709 | 1238 | if (xfs_sb_version_haslogv2(&mp->m_sb)) { |
9da096fd MP |
1239 | /* # headers = size / 32k |
1240 | * one header holds cycles from 32k of data | |
1da177e4 LT |
1241 | */ |
1242 | ||
1243 | xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE; | |
1244 | if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE) | |
1245 | xhdrs++; | |
1246 | log->l_iclog_hsize = xhdrs << BBSHIFT; | |
1247 | log->l_iclog_heads = xhdrs; | |
1248 | } else { | |
1249 | ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE); | |
1250 | log->l_iclog_hsize = BBSIZE; | |
1251 | log->l_iclog_heads = 1; | |
1252 | } | |
cfcbbbd0 | 1253 | goto done; |
1da177e4 LT |
1254 | } |
1255 | ||
9da096fd | 1256 | /* All machines use 32kB buffers by default. */ |
1cb51258 ES |
1257 | log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; |
1258 | log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; | |
1da177e4 LT |
1259 | |
1260 | /* the default log size is 16k or 32k which is one header sector */ | |
1261 | log->l_iclog_hsize = BBSIZE; | |
1262 | log->l_iclog_heads = 1; | |
1263 | ||
7153f8ba CH |
1264 | done: |
1265 | /* are we being asked to make the sizes selected above visible? */ | |
cfcbbbd0 NS |
1266 | if (mp->m_logbufs == 0) |
1267 | mp->m_logbufs = log->l_iclog_bufs; | |
1268 | if (mp->m_logbsize == 0) | |
1269 | mp->m_logbsize = log->l_iclog_size; | |
1da177e4 LT |
1270 | } /* xlog_get_iclog_buffer_size */ |
1271 | ||
1272 | ||
f661f1e0 DC |
1273 | void |
1274 | xfs_log_work_queue( | |
1275 | struct xfs_mount *mp) | |
1276 | { | |
5889608d | 1277 | queue_delayed_work(mp->m_log_workqueue, &mp->m_log->l_work, |
f661f1e0 DC |
1278 | msecs_to_jiffies(xfs_syncd_centisecs * 10)); |
1279 | } | |
1280 | ||
1281 | /* | |
1282 | * Every sync period we need to unpin all items in the AIL and push them to | |
1283 | * disk. If there is nothing dirty, then we might need to cover the log to | |
1284 | * indicate that the filesystem is idle. | |
1285 | */ | |
1286 | void | |
1287 | xfs_log_worker( | |
1288 | struct work_struct *work) | |
1289 | { | |
1290 | struct xlog *log = container_of(to_delayed_work(work), | |
1291 | struct xlog, l_work); | |
1292 | struct xfs_mount *mp = log->l_mp; | |
1293 | ||
1294 | /* dgc: errors ignored - not fatal and nowhere to report them */ | |
1295 | if (xfs_log_need_covered(mp)) | |
1296 | xfs_fs_log_dummy(mp); | |
1297 | else | |
1298 | xfs_log_force(mp, 0); | |
1299 | ||
1300 | /* start pushing all the metadata that is currently dirty */ | |
1301 | xfs_ail_push_all(mp->m_ail); | |
1302 | ||
1303 | /* queue us up again */ | |
1304 | xfs_log_work_queue(mp); | |
1305 | } | |
1306 | ||
1da177e4 LT |
1307 | /* |
1308 | * This routine initializes some of the log structure for a given mount point. | |
1309 | * Its primary purpose is to fill in enough, so recovery can occur. However, | |
1310 | * some other stuff may be filled in too. | |
1311 | */ | |
9a8d2fdb MT |
1312 | STATIC struct xlog * |
1313 | xlog_alloc_log( | |
1314 | struct xfs_mount *mp, | |
1315 | struct xfs_buftarg *log_target, | |
1316 | xfs_daddr_t blk_offset, | |
1317 | int num_bblks) | |
1da177e4 | 1318 | { |
9a8d2fdb | 1319 | struct xlog *log; |
1da177e4 LT |
1320 | xlog_rec_header_t *head; |
1321 | xlog_in_core_t **iclogp; | |
1322 | xlog_in_core_t *iclog, *prev_iclog=NULL; | |
1323 | xfs_buf_t *bp; | |
1324 | int i; | |
2451337d | 1325 | int error = -ENOMEM; |
69ce58f0 | 1326 | uint log2_size = 0; |
1da177e4 | 1327 | |
9a8d2fdb | 1328 | log = kmem_zalloc(sizeof(struct xlog), KM_MAYFAIL); |
a6cb767e | 1329 | if (!log) { |
a0fa2b67 | 1330 | xfs_warn(mp, "Log allocation failed: No memory!"); |
a6cb767e DC |
1331 | goto out; |
1332 | } | |
1da177e4 LT |
1333 | |
1334 | log->l_mp = mp; | |
1335 | log->l_targ = log_target; | |
1336 | log->l_logsize = BBTOB(num_bblks); | |
1337 | log->l_logBBstart = blk_offset; | |
1338 | log->l_logBBsize = num_bblks; | |
1339 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
1340 | log->l_flags |= XLOG_ACTIVE_RECOVERY; | |
f661f1e0 | 1341 | INIT_DELAYED_WORK(&log->l_work, xfs_log_worker); |
1da177e4 LT |
1342 | |
1343 | log->l_prev_block = -1; | |
1da177e4 | 1344 | /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ |
1c3cb9ec DC |
1345 | xlog_assign_atomic_lsn(&log->l_tail_lsn, 1, 0); |
1346 | xlog_assign_atomic_lsn(&log->l_last_sync_lsn, 1, 0); | |
1da177e4 | 1347 | log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ |
c303c5b8 CH |
1348 | |
1349 | xlog_grant_head_init(&log->l_reserve_head); | |
1350 | xlog_grant_head_init(&log->l_write_head); | |
1da177e4 | 1351 | |
2451337d | 1352 | error = -EFSCORRUPTED; |
62118709 | 1353 | if (xfs_sb_version_hassector(&mp->m_sb)) { |
69ce58f0 AE |
1354 | log2_size = mp->m_sb.sb_logsectlog; |
1355 | if (log2_size < BBSHIFT) { | |
a0fa2b67 DC |
1356 | xfs_warn(mp, "Log sector size too small (0x%x < 0x%x)", |
1357 | log2_size, BBSHIFT); | |
a6cb767e DC |
1358 | goto out_free_log; |
1359 | } | |
1360 | ||
69ce58f0 AE |
1361 | log2_size -= BBSHIFT; |
1362 | if (log2_size > mp->m_sectbb_log) { | |
a0fa2b67 DC |
1363 | xfs_warn(mp, "Log sector size too large (0x%x > 0x%x)", |
1364 | log2_size, mp->m_sectbb_log); | |
a6cb767e DC |
1365 | goto out_free_log; |
1366 | } | |
69ce58f0 AE |
1367 | |
1368 | /* for larger sector sizes, must have v2 or external log */ | |
1369 | if (log2_size && log->l_logBBstart > 0 && | |
1370 | !xfs_sb_version_haslogv2(&mp->m_sb)) { | |
a0fa2b67 DC |
1371 | xfs_warn(mp, |
1372 | "log sector size (0x%x) invalid for configuration.", | |
1373 | log2_size); | |
a6cb767e DC |
1374 | goto out_free_log; |
1375 | } | |
1da177e4 | 1376 | } |
69ce58f0 | 1377 | log->l_sectBBsize = 1 << log2_size; |
1da177e4 LT |
1378 | |
1379 | xlog_get_iclog_buffer_size(mp, log); | |
1380 | ||
400b9d88 DC |
1381 | /* |
1382 | * Use a NULL block for the extra log buffer used during splits so that | |
1383 | * it will trigger errors if we ever try to do IO on it without first | |
1384 | * having set it up properly. | |
1385 | */ | |
2451337d | 1386 | error = -ENOMEM; |
400b9d88 DC |
1387 | bp = xfs_buf_alloc(mp->m_logdev_targp, XFS_BUF_DADDR_NULL, |
1388 | BTOBB(log->l_iclog_size), 0); | |
644c3567 DC |
1389 | if (!bp) |
1390 | goto out_free_log; | |
9c23eccc DC |
1391 | |
1392 | /* | |
1393 | * The iclogbuf buffer locks are held over IO but we are not going to do | |
1394 | * IO yet. Hence unlock the buffer so that the log IO path can grab it | |
1395 | * when appropriately. | |
1396 | */ | |
0c842ad4 | 1397 | ASSERT(xfs_buf_islocked(bp)); |
9c23eccc DC |
1398 | xfs_buf_unlock(bp); |
1399 | ||
1400 | bp->b_iodone = xlog_iodone; | |
1da177e4 LT |
1401 | log->l_xbuf = bp; |
1402 | ||
007c61c6 | 1403 | spin_lock_init(&log->l_icloglock); |
eb40a875 | 1404 | init_waitqueue_head(&log->l_flush_wait); |
1da177e4 | 1405 | |
1da177e4 LT |
1406 | iclogp = &log->l_iclog; |
1407 | /* | |
1408 | * The amount of memory to allocate for the iclog structure is | |
1409 | * rather funky due to the way the structure is defined. It is | |
1410 | * done this way so that we can use different sizes for machines | |
1411 | * with different amounts of memory. See the definition of | |
1412 | * xlog_in_core_t in xfs_log_priv.h for details. | |
1413 | */ | |
1da177e4 LT |
1414 | ASSERT(log->l_iclog_size >= 4096); |
1415 | for (i=0; i < log->l_iclog_bufs; i++) { | |
644c3567 DC |
1416 | *iclogp = kmem_zalloc(sizeof(xlog_in_core_t), KM_MAYFAIL); |
1417 | if (!*iclogp) | |
1418 | goto out_free_iclog; | |
1419 | ||
1da177e4 | 1420 | iclog = *iclogp; |
1da177e4 LT |
1421 | iclog->ic_prev = prev_iclog; |
1422 | prev_iclog = iclog; | |
1fa40b01 | 1423 | |
686865f7 | 1424 | bp = xfs_buf_get_uncached(mp->m_logdev_targp, |
e70b73f8 | 1425 | BTOBB(log->l_iclog_size), 0); |
644c3567 DC |
1426 | if (!bp) |
1427 | goto out_free_iclog; | |
c8da0faf | 1428 | |
9c23eccc DC |
1429 | ASSERT(xfs_buf_islocked(bp)); |
1430 | xfs_buf_unlock(bp); | |
1431 | ||
cb669ca5 | 1432 | bp->b_iodone = xlog_iodone; |
1fa40b01 | 1433 | iclog->ic_bp = bp; |
b28708d6 | 1434 | iclog->ic_data = bp->b_addr; |
4679b2d3 | 1435 | #ifdef DEBUG |
1da177e4 | 1436 | log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); |
4679b2d3 | 1437 | #endif |
1da177e4 LT |
1438 | head = &iclog->ic_header; |
1439 | memset(head, 0, sizeof(xlog_rec_header_t)); | |
b53e675d CH |
1440 | head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM); |
1441 | head->h_version = cpu_to_be32( | |
62118709 | 1442 | xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? 2 : 1); |
b53e675d | 1443 | head->h_size = cpu_to_be32(log->l_iclog_size); |
1da177e4 | 1444 | /* new fields */ |
b53e675d | 1445 | head->h_fmt = cpu_to_be32(XLOG_FMT); |
1da177e4 LT |
1446 | memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); |
1447 | ||
4e94b71b | 1448 | iclog->ic_size = BBTOB(bp->b_length) - log->l_iclog_hsize; |
1da177e4 LT |
1449 | iclog->ic_state = XLOG_STATE_ACTIVE; |
1450 | iclog->ic_log = log; | |
114d23aa DC |
1451 | atomic_set(&iclog->ic_refcnt, 0); |
1452 | spin_lock_init(&iclog->ic_callback_lock); | |
1da177e4 | 1453 | iclog->ic_callback_tail = &(iclog->ic_callback); |
b28708d6 | 1454 | iclog->ic_datap = (char *)iclog->ic_data + log->l_iclog_hsize; |
1da177e4 | 1455 | |
eb40a875 DC |
1456 | init_waitqueue_head(&iclog->ic_force_wait); |
1457 | init_waitqueue_head(&iclog->ic_write_wait); | |
1da177e4 LT |
1458 | |
1459 | iclogp = &iclog->ic_next; | |
1460 | } | |
1461 | *iclogp = log->l_iclog; /* complete ring */ | |
1462 | log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ | |
1463 | ||
71e330b5 DC |
1464 | error = xlog_cil_init(log); |
1465 | if (error) | |
1466 | goto out_free_iclog; | |
1da177e4 | 1467 | return log; |
644c3567 DC |
1468 | |
1469 | out_free_iclog: | |
1470 | for (iclog = log->l_iclog; iclog; iclog = prev_iclog) { | |
1471 | prev_iclog = iclog->ic_next; | |
eb40a875 | 1472 | if (iclog->ic_bp) |
644c3567 | 1473 | xfs_buf_free(iclog->ic_bp); |
644c3567 DC |
1474 | kmem_free(iclog); |
1475 | } | |
1476 | spinlock_destroy(&log->l_icloglock); | |
644c3567 DC |
1477 | xfs_buf_free(log->l_xbuf); |
1478 | out_free_log: | |
1479 | kmem_free(log); | |
a6cb767e | 1480 | out: |
2451337d | 1481 | return ERR_PTR(error); |
1da177e4 LT |
1482 | } /* xlog_alloc_log */ |
1483 | ||
1484 | ||
1485 | /* | |
1486 | * Write out the commit record of a transaction associated with the given | |
1487 | * ticket. Return the lsn of the commit record. | |
1488 | */ | |
1489 | STATIC int | |
55b66332 | 1490 | xlog_commit_record( |
ad223e60 | 1491 | struct xlog *log, |
55b66332 DC |
1492 | struct xlog_ticket *ticket, |
1493 | struct xlog_in_core **iclog, | |
1494 | xfs_lsn_t *commitlsnp) | |
1da177e4 | 1495 | { |
55b66332 DC |
1496 | struct xfs_mount *mp = log->l_mp; |
1497 | int error; | |
1498 | struct xfs_log_iovec reg = { | |
1499 | .i_addr = NULL, | |
1500 | .i_len = 0, | |
1501 | .i_type = XLOG_REG_TYPE_COMMIT, | |
1502 | }; | |
1503 | struct xfs_log_vec vec = { | |
1504 | .lv_niovecs = 1, | |
1505 | .lv_iovecp = ®, | |
1506 | }; | |
1da177e4 LT |
1507 | |
1508 | ASSERT_ALWAYS(iclog); | |
55b66332 DC |
1509 | error = xlog_write(log, &vec, ticket, commitlsnp, iclog, |
1510 | XLOG_COMMIT_TRANS); | |
1511 | if (error) | |
7d04a335 | 1512 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
014c2544 | 1513 | return error; |
55b66332 | 1514 | } |
1da177e4 LT |
1515 | |
1516 | /* | |
1517 | * Push on the buffer cache code if we ever use more than 75% of the on-disk | |
1518 | * log space. This code pushes on the lsn which would supposedly free up | |
1519 | * the 25% which we want to leave free. We may need to adopt a policy which | |
1520 | * pushes on an lsn which is further along in the log once we reach the high | |
1521 | * water mark. In this manner, we would be creating a low water mark. | |
1522 | */ | |
a8272ce0 | 1523 | STATIC void |
2ced19cb | 1524 | xlog_grant_push_ail( |
ad223e60 | 1525 | struct xlog *log, |
2ced19cb | 1526 | int need_bytes) |
1da177e4 | 1527 | { |
2ced19cb | 1528 | xfs_lsn_t threshold_lsn = 0; |
84f3c683 | 1529 | xfs_lsn_t last_sync_lsn; |
2ced19cb DC |
1530 | int free_blocks; |
1531 | int free_bytes; | |
1532 | int threshold_block; | |
1533 | int threshold_cycle; | |
1534 | int free_threshold; | |
1535 | ||
1536 | ASSERT(BTOBB(need_bytes) < log->l_logBBsize); | |
1537 | ||
28496968 | 1538 | free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); |
2ced19cb DC |
1539 | free_blocks = BTOBBT(free_bytes); |
1540 | ||
1541 | /* | |
1542 | * Set the threshold for the minimum number of free blocks in the | |
1543 | * log to the maximum of what the caller needs, one quarter of the | |
1544 | * log, and 256 blocks. | |
1545 | */ | |
1546 | free_threshold = BTOBB(need_bytes); | |
1547 | free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2)); | |
1548 | free_threshold = MAX(free_threshold, 256); | |
1549 | if (free_blocks >= free_threshold) | |
1550 | return; | |
1551 | ||
1c3cb9ec DC |
1552 | xlog_crack_atomic_lsn(&log->l_tail_lsn, &threshold_cycle, |
1553 | &threshold_block); | |
1554 | threshold_block += free_threshold; | |
1da177e4 | 1555 | if (threshold_block >= log->l_logBBsize) { |
2ced19cb DC |
1556 | threshold_block -= log->l_logBBsize; |
1557 | threshold_cycle += 1; | |
1da177e4 | 1558 | } |
2ced19cb DC |
1559 | threshold_lsn = xlog_assign_lsn(threshold_cycle, |
1560 | threshold_block); | |
1561 | /* | |
1562 | * Don't pass in an lsn greater than the lsn of the last | |
84f3c683 DC |
1563 | * log record known to be on disk. Use a snapshot of the last sync lsn |
1564 | * so that it doesn't change between the compare and the set. | |
1da177e4 | 1565 | */ |
84f3c683 DC |
1566 | last_sync_lsn = atomic64_read(&log->l_last_sync_lsn); |
1567 | if (XFS_LSN_CMP(threshold_lsn, last_sync_lsn) > 0) | |
1568 | threshold_lsn = last_sync_lsn; | |
2ced19cb DC |
1569 | |
1570 | /* | |
1571 | * Get the transaction layer to kick the dirty buffers out to | |
1572 | * disk asynchronously. No point in trying to do this if | |
1573 | * the filesystem is shutting down. | |
1574 | */ | |
1575 | if (!XLOG_FORCED_SHUTDOWN(log)) | |
fd074841 | 1576 | xfs_ail_push(log->l_ailp, threshold_lsn); |
2ced19cb | 1577 | } |
1da177e4 | 1578 | |
0e446be4 CH |
1579 | /* |
1580 | * Stamp cycle number in every block | |
1581 | */ | |
1582 | STATIC void | |
1583 | xlog_pack_data( | |
1584 | struct xlog *log, | |
1585 | struct xlog_in_core *iclog, | |
1586 | int roundoff) | |
1587 | { | |
1588 | int i, j, k; | |
1589 | int size = iclog->ic_offset + roundoff; | |
1590 | __be32 cycle_lsn; | |
1591 | xfs_caddr_t dp; | |
1592 | ||
1593 | cycle_lsn = CYCLE_LSN_DISK(iclog->ic_header.h_lsn); | |
1594 | ||
1595 | dp = iclog->ic_datap; | |
1596 | for (i = 0; i < BTOBB(size); i++) { | |
1597 | if (i >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) | |
1598 | break; | |
1599 | iclog->ic_header.h_cycle_data[i] = *(__be32 *)dp; | |
1600 | *(__be32 *)dp = cycle_lsn; | |
1601 | dp += BBSIZE; | |
1602 | } | |
1603 | ||
1604 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) { | |
1605 | xlog_in_core_2_t *xhdr = iclog->ic_data; | |
1606 | ||
1607 | for ( ; i < BTOBB(size); i++) { | |
1608 | j = i / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
1609 | k = i % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
1610 | xhdr[j].hic_xheader.xh_cycle_data[k] = *(__be32 *)dp; | |
1611 | *(__be32 *)dp = cycle_lsn; | |
1612 | dp += BBSIZE; | |
1613 | } | |
1614 | ||
1615 | for (i = 1; i < log->l_iclog_heads; i++) | |
1616 | xhdr[i].hic_xheader.xh_cycle = cycle_lsn; | |
1617 | } | |
1618 | } | |
1619 | ||
1620 | /* | |
1621 | * Calculate the checksum for a log buffer. | |
1622 | * | |
1623 | * This is a little more complicated than it should be because the various | |
1624 | * headers and the actual data are non-contiguous. | |
1625 | */ | |
f9668a09 | 1626 | __le32 |
0e446be4 CH |
1627 | xlog_cksum( |
1628 | struct xlog *log, | |
1629 | struct xlog_rec_header *rhead, | |
1630 | char *dp, | |
1631 | int size) | |
1632 | { | |
1633 | __uint32_t crc; | |
1634 | ||
1635 | /* first generate the crc for the record header ... */ | |
1636 | crc = xfs_start_cksum((char *)rhead, | |
1637 | sizeof(struct xlog_rec_header), | |
1638 | offsetof(struct xlog_rec_header, h_crc)); | |
1639 | ||
1640 | /* ... then for additional cycle data for v2 logs ... */ | |
1641 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) { | |
1642 | union xlog_in_core2 *xhdr = (union xlog_in_core2 *)rhead; | |
1643 | int i; | |
1644 | ||
1645 | for (i = 1; i < log->l_iclog_heads; i++) { | |
1646 | crc = crc32c(crc, &xhdr[i].hic_xheader, | |
1647 | sizeof(struct xlog_rec_ext_header)); | |
1648 | } | |
1649 | } | |
1650 | ||
1651 | /* ... and finally for the payload */ | |
1652 | crc = crc32c(crc, dp, size); | |
1653 | ||
1654 | return xfs_end_cksum(crc); | |
1655 | } | |
1656 | ||
873ff550 CH |
1657 | /* |
1658 | * The bdstrat callback function for log bufs. This gives us a central | |
1659 | * place to trap bufs in case we get hit by a log I/O error and need to | |
1660 | * shutdown. Actually, in practice, even when we didn't get a log error, | |
1661 | * we transition the iclogs to IOERROR state *after* flushing all existing | |
1662 | * iclogs to disk. This is because we don't want anymore new transactions to be | |
1663 | * started or completed afterwards. | |
9c23eccc DC |
1664 | * |
1665 | * We lock the iclogbufs here so that we can serialise against IO completion | |
1666 | * during unmount. We might be processing a shutdown triggered during unmount, | |
1667 | * and that can occur asynchronously to the unmount thread, and hence we need to | |
1668 | * ensure that completes before tearing down the iclogbufs. Hence we need to | |
1669 | * hold the buffer lock across the log IO to acheive that. | |
873ff550 CH |
1670 | */ |
1671 | STATIC int | |
1672 | xlog_bdstrat( | |
1673 | struct xfs_buf *bp) | |
1674 | { | |
adadbeef | 1675 | struct xlog_in_core *iclog = bp->b_fspriv; |
873ff550 | 1676 | |
9c23eccc | 1677 | xfs_buf_lock(bp); |
873ff550 | 1678 | if (iclog->ic_state & XLOG_STATE_IOERROR) { |
2451337d | 1679 | xfs_buf_ioerror(bp, -EIO); |
c867cb61 | 1680 | xfs_buf_stale(bp); |
e8aaba9a | 1681 | xfs_buf_ioend(bp); |
873ff550 CH |
1682 | /* |
1683 | * It would seem logical to return EIO here, but we rely on | |
1684 | * the log state machine to propagate I/O errors instead of | |
9c23eccc DC |
1685 | * doing it here. Similarly, IO completion will unlock the |
1686 | * buffer, so we don't do it here. | |
873ff550 CH |
1687 | */ |
1688 | return 0; | |
1689 | } | |
1690 | ||
595bff75 | 1691 | xfs_buf_submit(bp); |
873ff550 CH |
1692 | return 0; |
1693 | } | |
1da177e4 LT |
1694 | |
1695 | /* | |
1696 | * Flush out the in-core log (iclog) to the on-disk log in an asynchronous | |
1697 | * fashion. Previously, we should have moved the current iclog | |
1698 | * ptr in the log to point to the next available iclog. This allows further | |
1699 | * write to continue while this code syncs out an iclog ready to go. | |
1700 | * Before an in-core log can be written out, the data section must be scanned | |
1701 | * to save away the 1st word of each BBSIZE block into the header. We replace | |
1702 | * it with the current cycle count. Each BBSIZE block is tagged with the | |
1703 | * cycle count because there in an implicit assumption that drives will | |
1704 | * guarantee that entire 512 byte blocks get written at once. In other words, | |
1705 | * we can't have part of a 512 byte block written and part not written. By | |
1706 | * tagging each block, we will know which blocks are valid when recovering | |
1707 | * after an unclean shutdown. | |
1708 | * | |
1709 | * This routine is single threaded on the iclog. No other thread can be in | |
1710 | * this routine with the same iclog. Changing contents of iclog can there- | |
1711 | * fore be done without grabbing the state machine lock. Updating the global | |
1712 | * log will require grabbing the lock though. | |
1713 | * | |
1714 | * The entire log manager uses a logical block numbering scheme. Only | |
1715 | * log_sync (and then only bwrite()) know about the fact that the log may | |
1716 | * not start with block zero on a given device. The log block start offset | |
1717 | * is added immediately before calling bwrite(). | |
1718 | */ | |
1719 | ||
a8272ce0 | 1720 | STATIC int |
9a8d2fdb MT |
1721 | xlog_sync( |
1722 | struct xlog *log, | |
1723 | struct xlog_in_core *iclog) | |
1da177e4 | 1724 | { |
1da177e4 | 1725 | xfs_buf_t *bp; |
b53e675d | 1726 | int i; |
1da177e4 LT |
1727 | uint count; /* byte count of bwrite */ |
1728 | uint count_init; /* initial count before roundup */ | |
1729 | int roundoff; /* roundoff to BB or stripe */ | |
1730 | int split = 0; /* split write into two regions */ | |
1731 | int error; | |
62118709 | 1732 | int v2 = xfs_sb_version_haslogv2(&log->l_mp->m_sb); |
0e446be4 | 1733 | int size; |
1da177e4 LT |
1734 | |
1735 | XFS_STATS_INC(xs_log_writes); | |
155cc6b7 | 1736 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 LT |
1737 | |
1738 | /* Add for LR header */ | |
1739 | count_init = log->l_iclog_hsize + iclog->ic_offset; | |
1740 | ||
1741 | /* Round out the log write size */ | |
1742 | if (v2 && log->l_mp->m_sb.sb_logsunit > 1) { | |
1743 | /* we have a v2 stripe unit to use */ | |
1744 | count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); | |
1745 | } else { | |
1746 | count = BBTOB(BTOBB(count_init)); | |
1747 | } | |
1748 | roundoff = count - count_init; | |
1749 | ASSERT(roundoff >= 0); | |
1750 | ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 && | |
1751 | roundoff < log->l_mp->m_sb.sb_logsunit) | |
1752 | || | |
1753 | (log->l_mp->m_sb.sb_logsunit <= 1 && | |
1754 | roundoff < BBTOB(1))); | |
1755 | ||
1756 | /* move grant heads by roundoff in sync */ | |
28496968 CH |
1757 | xlog_grant_add_space(log, &log->l_reserve_head.grant, roundoff); |
1758 | xlog_grant_add_space(log, &log->l_write_head.grant, roundoff); | |
1da177e4 LT |
1759 | |
1760 | /* put cycle number in every block */ | |
1761 | xlog_pack_data(log, iclog, roundoff); | |
1762 | ||
1763 | /* real byte length */ | |
0e446be4 CH |
1764 | size = iclog->ic_offset; |
1765 | if (v2) | |
1766 | size += roundoff; | |
1767 | iclog->ic_header.h_len = cpu_to_be32(size); | |
1da177e4 | 1768 | |
f5faad79 | 1769 | bp = iclog->ic_bp; |
b53e675d | 1770 | XFS_BUF_SET_ADDR(bp, BLOCK_LSN(be64_to_cpu(iclog->ic_header.h_lsn))); |
1da177e4 LT |
1771 | |
1772 | XFS_STATS_ADD(xs_log_blocks, BTOBB(count)); | |
1773 | ||
1774 | /* Do we need to split this write into 2 parts? */ | |
1775 | if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) { | |
0e446be4 CH |
1776 | char *dptr; |
1777 | ||
1da177e4 LT |
1778 | split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp))); |
1779 | count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)); | |
0e446be4 CH |
1780 | iclog->ic_bwritecnt = 2; |
1781 | ||
1782 | /* | |
1783 | * Bump the cycle numbers at the start of each block in the | |
1784 | * part of the iclog that ends up in the buffer that gets | |
1785 | * written to the start of the log. | |
1786 | * | |
1787 | * Watch out for the header magic number case, though. | |
1788 | */ | |
1789 | dptr = (char *)&iclog->ic_header + count; | |
1790 | for (i = 0; i < split; i += BBSIZE) { | |
1791 | __uint32_t cycle = be32_to_cpu(*(__be32 *)dptr); | |
1792 | if (++cycle == XLOG_HEADER_MAGIC_NUM) | |
1793 | cycle++; | |
1794 | *(__be32 *)dptr = cpu_to_be32(cycle); | |
1795 | ||
1796 | dptr += BBSIZE; | |
1797 | } | |
1da177e4 LT |
1798 | } else { |
1799 | iclog->ic_bwritecnt = 1; | |
1800 | } | |
0e446be4 CH |
1801 | |
1802 | /* calculcate the checksum */ | |
1803 | iclog->ic_header.h_crc = xlog_cksum(log, &iclog->ic_header, | |
1804 | iclog->ic_datap, size); | |
1805 | ||
aa0e8833 | 1806 | bp->b_io_length = BTOBB(count); |
adadbeef | 1807 | bp->b_fspriv = iclog; |
f5faad79 | 1808 | XFS_BUF_ZEROFLAGS(bp); |
1da177e4 | 1809 | XFS_BUF_ASYNC(bp); |
1d5ae5df | 1810 | bp->b_flags |= XBF_SYNCIO; |
651701d7 | 1811 | |
a27a263b | 1812 | if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) { |
e163cbde CH |
1813 | bp->b_flags |= XBF_FUA; |
1814 | ||
a27a263b | 1815 | /* |
e163cbde CH |
1816 | * Flush the data device before flushing the log to make |
1817 | * sure all meta data written back from the AIL actually made | |
1818 | * it to disk before stamping the new log tail LSN into the | |
1819 | * log buffer. For an external log we need to issue the | |
1820 | * flush explicitly, and unfortunately synchronously here; | |
1821 | * for an internal log we can simply use the block layer | |
1822 | * state machine for preflushes. | |
a27a263b CH |
1823 | */ |
1824 | if (log->l_mp->m_logdev_targp != log->l_mp->m_ddev_targp) | |
1825 | xfs_blkdev_issue_flush(log->l_mp->m_ddev_targp); | |
e163cbde CH |
1826 | else |
1827 | bp->b_flags |= XBF_FLUSH; | |
a27a263b | 1828 | } |
1da177e4 LT |
1829 | |
1830 | ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); | |
1831 | ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); | |
1832 | ||
003fd6c8 | 1833 | xlog_verify_iclog(log, iclog, count, true); |
1da177e4 LT |
1834 | |
1835 | /* account for log which doesn't start at block #0 */ | |
1836 | XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); | |
1837 | /* | |
1838 | * Don't call xfs_bwrite here. We do log-syncs even when the filesystem | |
1839 | * is shutting down. | |
1840 | */ | |
1841 | XFS_BUF_WRITE(bp); | |
1842 | ||
901796af CH |
1843 | error = xlog_bdstrat(bp); |
1844 | if (error) { | |
1845 | xfs_buf_ioerror_alert(bp, "xlog_sync"); | |
014c2544 | 1846 | return error; |
1da177e4 LT |
1847 | } |
1848 | if (split) { | |
f5faad79 | 1849 | bp = iclog->ic_log->l_xbuf; |
1da177e4 | 1850 | XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */ |
02fe03d9 CS |
1851 | xfs_buf_associate_memory(bp, |
1852 | (char *)&iclog->ic_header + count, split); | |
adadbeef | 1853 | bp->b_fspriv = iclog; |
f5faad79 | 1854 | XFS_BUF_ZEROFLAGS(bp); |
1da177e4 | 1855 | XFS_BUF_ASYNC(bp); |
1d5ae5df | 1856 | bp->b_flags |= XBF_SYNCIO; |
f538d4da | 1857 | if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) |
e163cbde | 1858 | bp->b_flags |= XBF_FUA; |
1da177e4 LT |
1859 | |
1860 | ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); | |
1861 | ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); | |
1862 | ||
c41564b5 | 1863 | /* account for internal log which doesn't start at block #0 */ |
1da177e4 LT |
1864 | XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); |
1865 | XFS_BUF_WRITE(bp); | |
901796af CH |
1866 | error = xlog_bdstrat(bp); |
1867 | if (error) { | |
1868 | xfs_buf_ioerror_alert(bp, "xlog_sync (split)"); | |
014c2544 | 1869 | return error; |
1da177e4 LT |
1870 | } |
1871 | } | |
014c2544 | 1872 | return 0; |
1da177e4 LT |
1873 | } /* xlog_sync */ |
1874 | ||
1da177e4 | 1875 | /* |
c41564b5 | 1876 | * Deallocate a log structure |
1da177e4 | 1877 | */ |
a8272ce0 | 1878 | STATIC void |
9a8d2fdb MT |
1879 | xlog_dealloc_log( |
1880 | struct xlog *log) | |
1da177e4 LT |
1881 | { |
1882 | xlog_in_core_t *iclog, *next_iclog; | |
1da177e4 LT |
1883 | int i; |
1884 | ||
71e330b5 DC |
1885 | xlog_cil_destroy(log); |
1886 | ||
44396476 | 1887 | /* |
9c23eccc DC |
1888 | * Cycle all the iclogbuf locks to make sure all log IO completion |
1889 | * is done before we tear down these buffers. | |
1890 | */ | |
1891 | iclog = log->l_iclog; | |
1892 | for (i = 0; i < log->l_iclog_bufs; i++) { | |
1893 | xfs_buf_lock(iclog->ic_bp); | |
1894 | xfs_buf_unlock(iclog->ic_bp); | |
1895 | iclog = iclog->ic_next; | |
1896 | } | |
1897 | ||
1898 | /* | |
1899 | * Always need to ensure that the extra buffer does not point to memory | |
1900 | * owned by another log buffer before we free it. Also, cycle the lock | |
1901 | * first to ensure we've completed IO on it. | |
44396476 | 1902 | */ |
9c23eccc DC |
1903 | xfs_buf_lock(log->l_xbuf); |
1904 | xfs_buf_unlock(log->l_xbuf); | |
e70b73f8 | 1905 | xfs_buf_set_empty(log->l_xbuf, BTOBB(log->l_iclog_size)); |
44396476 DC |
1906 | xfs_buf_free(log->l_xbuf); |
1907 | ||
1da177e4 | 1908 | iclog = log->l_iclog; |
9c23eccc | 1909 | for (i = 0; i < log->l_iclog_bufs; i++) { |
1da177e4 | 1910 | xfs_buf_free(iclog->ic_bp); |
1da177e4 | 1911 | next_iclog = iclog->ic_next; |
f0e2d93c | 1912 | kmem_free(iclog); |
1da177e4 LT |
1913 | iclog = next_iclog; |
1914 | } | |
1da177e4 | 1915 | spinlock_destroy(&log->l_icloglock); |
1da177e4 | 1916 | |
1da177e4 | 1917 | log->l_mp->m_log = NULL; |
f0e2d93c | 1918 | kmem_free(log); |
c41564b5 | 1919 | } /* xlog_dealloc_log */ |
1da177e4 LT |
1920 | |
1921 | /* | |
1922 | * Update counters atomically now that memcpy is done. | |
1923 | */ | |
1924 | /* ARGSUSED */ | |
1925 | static inline void | |
9a8d2fdb MT |
1926 | xlog_state_finish_copy( |
1927 | struct xlog *log, | |
1928 | struct xlog_in_core *iclog, | |
1929 | int record_cnt, | |
1930 | int copy_bytes) | |
1da177e4 | 1931 | { |
b22cd72c | 1932 | spin_lock(&log->l_icloglock); |
1da177e4 | 1933 | |
413d57c9 | 1934 | be32_add_cpu(&iclog->ic_header.h_num_logops, record_cnt); |
1da177e4 LT |
1935 | iclog->ic_offset += copy_bytes; |
1936 | ||
b22cd72c | 1937 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
1938 | } /* xlog_state_finish_copy */ |
1939 | ||
1940 | ||
1941 | ||
1942 | ||
7e9c6396 TS |
1943 | /* |
1944 | * print out info relating to regions written which consume | |
1945 | * the reservation | |
1946 | */ | |
71e330b5 DC |
1947 | void |
1948 | xlog_print_tic_res( | |
1949 | struct xfs_mount *mp, | |
1950 | struct xlog_ticket *ticket) | |
7e9c6396 TS |
1951 | { |
1952 | uint i; | |
1953 | uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); | |
1954 | ||
1955 | /* match with XLOG_REG_TYPE_* in xfs_log.h */ | |
1956 | static char *res_type_str[XLOG_REG_TYPE_MAX] = { | |
1957 | "bformat", | |
1958 | "bchunk", | |
1959 | "efi_format", | |
1960 | "efd_format", | |
1961 | "iformat", | |
1962 | "icore", | |
1963 | "iext", | |
1964 | "ibroot", | |
1965 | "ilocal", | |
1966 | "iattr_ext", | |
1967 | "iattr_broot", | |
1968 | "iattr_local", | |
1969 | "qformat", | |
1970 | "dquot", | |
1971 | "quotaoff", | |
1972 | "LR header", | |
1973 | "unmount", | |
1974 | "commit", | |
1975 | "trans header" | |
1976 | }; | |
1977 | static char *trans_type_str[XFS_TRANS_TYPE_MAX] = { | |
1978 | "SETATTR_NOT_SIZE", | |
1979 | "SETATTR_SIZE", | |
1980 | "INACTIVE", | |
1981 | "CREATE", | |
1982 | "CREATE_TRUNC", | |
1983 | "TRUNCATE_FILE", | |
1984 | "REMOVE", | |
1985 | "LINK", | |
1986 | "RENAME", | |
1987 | "MKDIR", | |
1988 | "RMDIR", | |
1989 | "SYMLINK", | |
1990 | "SET_DMATTRS", | |
1991 | "GROWFS", | |
1992 | "STRAT_WRITE", | |
1993 | "DIOSTRAT", | |
1994 | "WRITE_SYNC", | |
1995 | "WRITEID", | |
1996 | "ADDAFORK", | |
1997 | "ATTRINVAL", | |
1998 | "ATRUNCATE", | |
1999 | "ATTR_SET", | |
2000 | "ATTR_RM", | |
2001 | "ATTR_FLAG", | |
2002 | "CLEAR_AGI_BUCKET", | |
2003 | "QM_SBCHANGE", | |
2004 | "DUMMY1", | |
2005 | "DUMMY2", | |
2006 | "QM_QUOTAOFF", | |
2007 | "QM_DQALLOC", | |
2008 | "QM_SETQLIM", | |
2009 | "QM_DQCLUSTER", | |
2010 | "QM_QINOCREATE", | |
2011 | "QM_QUOTAOFF_END", | |
2012 | "SB_UNIT", | |
2013 | "FSYNC_TS", | |
2014 | "GROWFSRT_ALLOC", | |
2015 | "GROWFSRT_ZERO", | |
2016 | "GROWFSRT_FREE", | |
2017 | "SWAPEXT" | |
2018 | }; | |
2019 | ||
a0fa2b67 | 2020 | xfs_warn(mp, |
93b8a585 | 2021 | "xlog_write: reservation summary:\n" |
a0fa2b67 DC |
2022 | " trans type = %s (%u)\n" |
2023 | " unit res = %d bytes\n" | |
2024 | " current res = %d bytes\n" | |
2025 | " total reg = %u bytes (o/flow = %u bytes)\n" | |
2026 | " ophdrs = %u (ophdr space = %u bytes)\n" | |
2027 | " ophdr + reg = %u bytes\n" | |
2028 | " num regions = %u\n", | |
2029 | ((ticket->t_trans_type <= 0 || | |
2030 | ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ? | |
2031 | "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]), | |
2032 | ticket->t_trans_type, | |
2033 | ticket->t_unit_res, | |
2034 | ticket->t_curr_res, | |
2035 | ticket->t_res_arr_sum, ticket->t_res_o_flow, | |
2036 | ticket->t_res_num_ophdrs, ophdr_spc, | |
2037 | ticket->t_res_arr_sum + | |
2038 | ticket->t_res_o_flow + ophdr_spc, | |
2039 | ticket->t_res_num); | |
7e9c6396 TS |
2040 | |
2041 | for (i = 0; i < ticket->t_res_num; i++) { | |
a0fa2b67 | 2042 | uint r_type = ticket->t_res_arr[i].r_type; |
08e96e1a | 2043 | xfs_warn(mp, "region[%u]: %s - %u bytes", i, |
7e9c6396 TS |
2044 | ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ? |
2045 | "bad-rtype" : res_type_str[r_type-1]), | |
2046 | ticket->t_res_arr[i].r_len); | |
2047 | } | |
169a7b07 | 2048 | |
a0fa2b67 | 2049 | xfs_alert_tag(mp, XFS_PTAG_LOGRES, |
93b8a585 | 2050 | "xlog_write: reservation ran out. Need to up reservation"); |
297aa637 | 2051 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
7e9c6396 | 2052 | } |
7e9c6396 | 2053 | |
b5203cd0 DC |
2054 | /* |
2055 | * Calculate the potential space needed by the log vector. Each region gets | |
2056 | * its own xlog_op_header_t and may need to be double word aligned. | |
2057 | */ | |
2058 | static int | |
2059 | xlog_write_calc_vec_length( | |
2060 | struct xlog_ticket *ticket, | |
55b66332 | 2061 | struct xfs_log_vec *log_vector) |
b5203cd0 | 2062 | { |
55b66332 | 2063 | struct xfs_log_vec *lv; |
b5203cd0 DC |
2064 | int headers = 0; |
2065 | int len = 0; | |
2066 | int i; | |
2067 | ||
2068 | /* acct for start rec of xact */ | |
2069 | if (ticket->t_flags & XLOG_TIC_INITED) | |
2070 | headers++; | |
2071 | ||
55b66332 | 2072 | for (lv = log_vector; lv; lv = lv->lv_next) { |
fd63875c DC |
2073 | /* we don't write ordered log vectors */ |
2074 | if (lv->lv_buf_len == XFS_LOG_VEC_ORDERED) | |
2075 | continue; | |
2076 | ||
55b66332 DC |
2077 | headers += lv->lv_niovecs; |
2078 | ||
2079 | for (i = 0; i < lv->lv_niovecs; i++) { | |
2080 | struct xfs_log_iovec *vecp = &lv->lv_iovecp[i]; | |
b5203cd0 | 2081 | |
55b66332 DC |
2082 | len += vecp->i_len; |
2083 | xlog_tic_add_region(ticket, vecp->i_len, vecp->i_type); | |
2084 | } | |
b5203cd0 DC |
2085 | } |
2086 | ||
2087 | ticket->t_res_num_ophdrs += headers; | |
2088 | len += headers * sizeof(struct xlog_op_header); | |
2089 | ||
2090 | return len; | |
2091 | } | |
2092 | ||
2093 | /* | |
2094 | * If first write for transaction, insert start record We can't be trying to | |
2095 | * commit if we are inited. We can't have any "partial_copy" if we are inited. | |
2096 | */ | |
2097 | static int | |
2098 | xlog_write_start_rec( | |
e6b1f273 | 2099 | struct xlog_op_header *ophdr, |
b5203cd0 DC |
2100 | struct xlog_ticket *ticket) |
2101 | { | |
b5203cd0 DC |
2102 | if (!(ticket->t_flags & XLOG_TIC_INITED)) |
2103 | return 0; | |
2104 | ||
2105 | ophdr->oh_tid = cpu_to_be32(ticket->t_tid); | |
2106 | ophdr->oh_clientid = ticket->t_clientid; | |
2107 | ophdr->oh_len = 0; | |
2108 | ophdr->oh_flags = XLOG_START_TRANS; | |
2109 | ophdr->oh_res2 = 0; | |
2110 | ||
2111 | ticket->t_flags &= ~XLOG_TIC_INITED; | |
2112 | ||
2113 | return sizeof(struct xlog_op_header); | |
2114 | } | |
2115 | ||
2116 | static xlog_op_header_t * | |
2117 | xlog_write_setup_ophdr( | |
ad223e60 | 2118 | struct xlog *log, |
e6b1f273 | 2119 | struct xlog_op_header *ophdr, |
b5203cd0 DC |
2120 | struct xlog_ticket *ticket, |
2121 | uint flags) | |
2122 | { | |
b5203cd0 DC |
2123 | ophdr->oh_tid = cpu_to_be32(ticket->t_tid); |
2124 | ophdr->oh_clientid = ticket->t_clientid; | |
2125 | ophdr->oh_res2 = 0; | |
2126 | ||
2127 | /* are we copying a commit or unmount record? */ | |
2128 | ophdr->oh_flags = flags; | |
2129 | ||
2130 | /* | |
2131 | * We've seen logs corrupted with bad transaction client ids. This | |
2132 | * makes sure that XFS doesn't generate them on. Turn this into an EIO | |
2133 | * and shut down the filesystem. | |
2134 | */ | |
2135 | switch (ophdr->oh_clientid) { | |
2136 | case XFS_TRANSACTION: | |
2137 | case XFS_VOLUME: | |
2138 | case XFS_LOG: | |
2139 | break; | |
2140 | default: | |
a0fa2b67 | 2141 | xfs_warn(log->l_mp, |
b5203cd0 DC |
2142 | "Bad XFS transaction clientid 0x%x in ticket 0x%p", |
2143 | ophdr->oh_clientid, ticket); | |
2144 | return NULL; | |
2145 | } | |
2146 | ||
2147 | return ophdr; | |
2148 | } | |
2149 | ||
2150 | /* | |
2151 | * Set up the parameters of the region copy into the log. This has | |
2152 | * to handle region write split across multiple log buffers - this | |
2153 | * state is kept external to this function so that this code can | |
ac0e300f | 2154 | * be written in an obvious, self documenting manner. |
b5203cd0 DC |
2155 | */ |
2156 | static int | |
2157 | xlog_write_setup_copy( | |
2158 | struct xlog_ticket *ticket, | |
2159 | struct xlog_op_header *ophdr, | |
2160 | int space_available, | |
2161 | int space_required, | |
2162 | int *copy_off, | |
2163 | int *copy_len, | |
2164 | int *last_was_partial_copy, | |
2165 | int *bytes_consumed) | |
2166 | { | |
2167 | int still_to_copy; | |
2168 | ||
2169 | still_to_copy = space_required - *bytes_consumed; | |
2170 | *copy_off = *bytes_consumed; | |
2171 | ||
2172 | if (still_to_copy <= space_available) { | |
2173 | /* write of region completes here */ | |
2174 | *copy_len = still_to_copy; | |
2175 | ophdr->oh_len = cpu_to_be32(*copy_len); | |
2176 | if (*last_was_partial_copy) | |
2177 | ophdr->oh_flags |= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); | |
2178 | *last_was_partial_copy = 0; | |
2179 | *bytes_consumed = 0; | |
2180 | return 0; | |
2181 | } | |
2182 | ||
2183 | /* partial write of region, needs extra log op header reservation */ | |
2184 | *copy_len = space_available; | |
2185 | ophdr->oh_len = cpu_to_be32(*copy_len); | |
2186 | ophdr->oh_flags |= XLOG_CONTINUE_TRANS; | |
2187 | if (*last_was_partial_copy) | |
2188 | ophdr->oh_flags |= XLOG_WAS_CONT_TRANS; | |
2189 | *bytes_consumed += *copy_len; | |
2190 | (*last_was_partial_copy)++; | |
2191 | ||
2192 | /* account for new log op header */ | |
2193 | ticket->t_curr_res -= sizeof(struct xlog_op_header); | |
2194 | ticket->t_res_num_ophdrs++; | |
2195 | ||
2196 | return sizeof(struct xlog_op_header); | |
2197 | } | |
2198 | ||
2199 | static int | |
2200 | xlog_write_copy_finish( | |
ad223e60 | 2201 | struct xlog *log, |
b5203cd0 DC |
2202 | struct xlog_in_core *iclog, |
2203 | uint flags, | |
2204 | int *record_cnt, | |
2205 | int *data_cnt, | |
2206 | int *partial_copy, | |
2207 | int *partial_copy_len, | |
2208 | int log_offset, | |
2209 | struct xlog_in_core **commit_iclog) | |
2210 | { | |
2211 | if (*partial_copy) { | |
2212 | /* | |
2213 | * This iclog has already been marked WANT_SYNC by | |
2214 | * xlog_state_get_iclog_space. | |
2215 | */ | |
2216 | xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt); | |
2217 | *record_cnt = 0; | |
2218 | *data_cnt = 0; | |
2219 | return xlog_state_release_iclog(log, iclog); | |
2220 | } | |
2221 | ||
2222 | *partial_copy = 0; | |
2223 | *partial_copy_len = 0; | |
2224 | ||
2225 | if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { | |
2226 | /* no more space in this iclog - push it. */ | |
2227 | xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt); | |
2228 | *record_cnt = 0; | |
2229 | *data_cnt = 0; | |
2230 | ||
2231 | spin_lock(&log->l_icloglock); | |
2232 | xlog_state_want_sync(log, iclog); | |
2233 | spin_unlock(&log->l_icloglock); | |
2234 | ||
2235 | if (!commit_iclog) | |
2236 | return xlog_state_release_iclog(log, iclog); | |
2237 | ASSERT(flags & XLOG_COMMIT_TRANS); | |
2238 | *commit_iclog = iclog; | |
2239 | } | |
2240 | ||
2241 | return 0; | |
2242 | } | |
2243 | ||
1da177e4 LT |
2244 | /* |
2245 | * Write some region out to in-core log | |
2246 | * | |
2247 | * This will be called when writing externally provided regions or when | |
2248 | * writing out a commit record for a given transaction. | |
2249 | * | |
2250 | * General algorithm: | |
2251 | * 1. Find total length of this write. This may include adding to the | |
2252 | * lengths passed in. | |
2253 | * 2. Check whether we violate the tickets reservation. | |
2254 | * 3. While writing to this iclog | |
2255 | * A. Reserve as much space in this iclog as can get | |
2256 | * B. If this is first write, save away start lsn | |
2257 | * C. While writing this region: | |
2258 | * 1. If first write of transaction, write start record | |
2259 | * 2. Write log operation header (header per region) | |
2260 | * 3. Find out if we can fit entire region into this iclog | |
2261 | * 4. Potentially, verify destination memcpy ptr | |
2262 | * 5. Memcpy (partial) region | |
2263 | * 6. If partial copy, release iclog; otherwise, continue | |
2264 | * copying more regions into current iclog | |
2265 | * 4. Mark want sync bit (in simulation mode) | |
2266 | * 5. Release iclog for potential flush to on-disk log. | |
2267 | * | |
2268 | * ERRORS: | |
2269 | * 1. Panic if reservation is overrun. This should never happen since | |
2270 | * reservation amounts are generated internal to the filesystem. | |
2271 | * NOTES: | |
2272 | * 1. Tickets are single threaded data structures. | |
2273 | * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the | |
2274 | * syncing routine. When a single log_write region needs to span | |
2275 | * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set | |
2276 | * on all log operation writes which don't contain the end of the | |
2277 | * region. The XLOG_END_TRANS bit is used for the in-core log | |
2278 | * operation which contains the end of the continued log_write region. | |
2279 | * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog, | |
2280 | * we don't really know exactly how much space will be used. As a result, | |
2281 | * we don't update ic_offset until the end when we know exactly how many | |
2282 | * bytes have been written out. | |
2283 | */ | |
71e330b5 | 2284 | int |
35a8a72f | 2285 | xlog_write( |
ad223e60 | 2286 | struct xlog *log, |
55b66332 | 2287 | struct xfs_log_vec *log_vector, |
35a8a72f CH |
2288 | struct xlog_ticket *ticket, |
2289 | xfs_lsn_t *start_lsn, | |
2290 | struct xlog_in_core **commit_iclog, | |
2291 | uint flags) | |
1da177e4 | 2292 | { |
99428ad0 | 2293 | struct xlog_in_core *iclog = NULL; |
55b66332 DC |
2294 | struct xfs_log_iovec *vecp; |
2295 | struct xfs_log_vec *lv; | |
99428ad0 CH |
2296 | int len; |
2297 | int index; | |
2298 | int partial_copy = 0; | |
2299 | int partial_copy_len = 0; | |
2300 | int contwr = 0; | |
2301 | int record_cnt = 0; | |
2302 | int data_cnt = 0; | |
2303 | int error; | |
2304 | ||
2305 | *start_lsn = 0; | |
2306 | ||
55b66332 | 2307 | len = xlog_write_calc_vec_length(ticket, log_vector); |
71e330b5 | 2308 | |
93b8a585 CH |
2309 | /* |
2310 | * Region headers and bytes are already accounted for. | |
2311 | * We only need to take into account start records and | |
2312 | * split regions in this function. | |
2313 | */ | |
2314 | if (ticket->t_flags & XLOG_TIC_INITED) | |
2315 | ticket->t_curr_res -= sizeof(xlog_op_header_t); | |
2316 | ||
2317 | /* | |
2318 | * Commit record headers need to be accounted for. These | |
2319 | * come in as separate writes so are easy to detect. | |
2320 | */ | |
2321 | if (flags & (XLOG_COMMIT_TRANS | XLOG_UNMOUNT_TRANS)) | |
2322 | ticket->t_curr_res -= sizeof(xlog_op_header_t); | |
71e330b5 DC |
2323 | |
2324 | if (ticket->t_curr_res < 0) | |
55b66332 | 2325 | xlog_print_tic_res(log->l_mp, ticket); |
1da177e4 | 2326 | |
55b66332 DC |
2327 | index = 0; |
2328 | lv = log_vector; | |
2329 | vecp = lv->lv_iovecp; | |
fd63875c | 2330 | while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) { |
e6b1f273 | 2331 | void *ptr; |
99428ad0 | 2332 | int log_offset; |
1da177e4 | 2333 | |
99428ad0 CH |
2334 | error = xlog_state_get_iclog_space(log, len, &iclog, ticket, |
2335 | &contwr, &log_offset); | |
2336 | if (error) | |
2337 | return error; | |
1da177e4 | 2338 | |
99428ad0 | 2339 | ASSERT(log_offset <= iclog->ic_size - 1); |
e6b1f273 | 2340 | ptr = iclog->ic_datap + log_offset; |
1da177e4 | 2341 | |
99428ad0 CH |
2342 | /* start_lsn is the first lsn written to. That's all we need. */ |
2343 | if (!*start_lsn) | |
2344 | *start_lsn = be64_to_cpu(iclog->ic_header.h_lsn); | |
b5203cd0 | 2345 | |
99428ad0 CH |
2346 | /* |
2347 | * This loop writes out as many regions as can fit in the amount | |
2348 | * of space which was allocated by xlog_state_get_iclog_space(). | |
2349 | */ | |
fd63875c DC |
2350 | while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) { |
2351 | struct xfs_log_iovec *reg; | |
99428ad0 CH |
2352 | struct xlog_op_header *ophdr; |
2353 | int start_rec_copy; | |
2354 | int copy_len; | |
2355 | int copy_off; | |
fd63875c DC |
2356 | bool ordered = false; |
2357 | ||
2358 | /* ordered log vectors have no regions to write */ | |
2359 | if (lv->lv_buf_len == XFS_LOG_VEC_ORDERED) { | |
2360 | ASSERT(lv->lv_niovecs == 0); | |
2361 | ordered = true; | |
2362 | goto next_lv; | |
2363 | } | |
99428ad0 | 2364 | |
fd63875c | 2365 | reg = &vecp[index]; |
55b66332 | 2366 | ASSERT(reg->i_len % sizeof(__int32_t) == 0); |
e6b1f273 | 2367 | ASSERT((unsigned long)ptr % sizeof(__int32_t) == 0); |
99428ad0 CH |
2368 | |
2369 | start_rec_copy = xlog_write_start_rec(ptr, ticket); | |
2370 | if (start_rec_copy) { | |
2371 | record_cnt++; | |
e6b1f273 | 2372 | xlog_write_adv_cnt(&ptr, &len, &log_offset, |
99428ad0 CH |
2373 | start_rec_copy); |
2374 | } | |
b5203cd0 | 2375 | |
99428ad0 CH |
2376 | ophdr = xlog_write_setup_ophdr(log, ptr, ticket, flags); |
2377 | if (!ophdr) | |
2451337d | 2378 | return -EIO; |
99428ad0 | 2379 | |
e6b1f273 | 2380 | xlog_write_adv_cnt(&ptr, &len, &log_offset, |
99428ad0 CH |
2381 | sizeof(struct xlog_op_header)); |
2382 | ||
2383 | len += xlog_write_setup_copy(ticket, ophdr, | |
2384 | iclog->ic_size-log_offset, | |
55b66332 | 2385 | reg->i_len, |
99428ad0 CH |
2386 | ©_off, ©_len, |
2387 | &partial_copy, | |
2388 | &partial_copy_len); | |
2389 | xlog_verify_dest_ptr(log, ptr); | |
2390 | ||
2391 | /* copy region */ | |
2392 | ASSERT(copy_len >= 0); | |
e6b1f273 CH |
2393 | memcpy(ptr, reg->i_addr + copy_off, copy_len); |
2394 | xlog_write_adv_cnt(&ptr, &len, &log_offset, copy_len); | |
99428ad0 CH |
2395 | |
2396 | copy_len += start_rec_copy + sizeof(xlog_op_header_t); | |
2397 | record_cnt++; | |
2398 | data_cnt += contwr ? copy_len : 0; | |
2399 | ||
2400 | error = xlog_write_copy_finish(log, iclog, flags, | |
2401 | &record_cnt, &data_cnt, | |
2402 | &partial_copy, | |
2403 | &partial_copy_len, | |
2404 | log_offset, | |
2405 | commit_iclog); | |
2406 | if (error) | |
2407 | return error; | |
2408 | ||
2409 | /* | |
2410 | * if we had a partial copy, we need to get more iclog | |
2411 | * space but we don't want to increment the region | |
2412 | * index because there is still more is this region to | |
2413 | * write. | |
2414 | * | |
2415 | * If we completed writing this region, and we flushed | |
2416 | * the iclog (indicated by resetting of the record | |
2417 | * count), then we also need to get more log space. If | |
2418 | * this was the last record, though, we are done and | |
2419 | * can just return. | |
2420 | */ | |
2421 | if (partial_copy) | |
2422 | break; | |
2423 | ||
55b66332 | 2424 | if (++index == lv->lv_niovecs) { |
fd63875c | 2425 | next_lv: |
55b66332 DC |
2426 | lv = lv->lv_next; |
2427 | index = 0; | |
2428 | if (lv) | |
2429 | vecp = lv->lv_iovecp; | |
2430 | } | |
fd63875c | 2431 | if (record_cnt == 0 && ordered == false) { |
55b66332 | 2432 | if (!lv) |
99428ad0 CH |
2433 | return 0; |
2434 | break; | |
2435 | } | |
2436 | } | |
2437 | } | |
2438 | ||
2439 | ASSERT(len == 0); | |
2440 | ||
2441 | xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); | |
2442 | if (!commit_iclog) | |
2443 | return xlog_state_release_iclog(log, iclog); | |
1da177e4 | 2444 | |
1da177e4 LT |
2445 | ASSERT(flags & XLOG_COMMIT_TRANS); |
2446 | *commit_iclog = iclog; | |
2447 | return 0; | |
99428ad0 | 2448 | } |
1da177e4 LT |
2449 | |
2450 | ||
2451 | /***************************************************************************** | |
2452 | * | |
2453 | * State Machine functions | |
2454 | * | |
2455 | ***************************************************************************** | |
2456 | */ | |
2457 | ||
2458 | /* Clean iclogs starting from the head. This ordering must be | |
2459 | * maintained, so an iclog doesn't become ACTIVE beyond one that | |
2460 | * is SYNCING. This is also required to maintain the notion that we use | |
12017faf | 2461 | * a ordered wait queue to hold off would be writers to the log when every |
1da177e4 LT |
2462 | * iclog is trying to sync to disk. |
2463 | * | |
2464 | * State Change: DIRTY -> ACTIVE | |
2465 | */ | |
ba0f32d4 | 2466 | STATIC void |
9a8d2fdb MT |
2467 | xlog_state_clean_log( |
2468 | struct xlog *log) | |
1da177e4 LT |
2469 | { |
2470 | xlog_in_core_t *iclog; | |
2471 | int changed = 0; | |
2472 | ||
2473 | iclog = log->l_iclog; | |
2474 | do { | |
2475 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
2476 | iclog->ic_state = XLOG_STATE_ACTIVE; | |
2477 | iclog->ic_offset = 0; | |
114d23aa | 2478 | ASSERT(iclog->ic_callback == NULL); |
1da177e4 LT |
2479 | /* |
2480 | * If the number of ops in this iclog indicate it just | |
2481 | * contains the dummy transaction, we can | |
2482 | * change state into IDLE (the second time around). | |
2483 | * Otherwise we should change the state into | |
2484 | * NEED a dummy. | |
2485 | * We don't need to cover the dummy. | |
2486 | */ | |
2487 | if (!changed && | |
b53e675d CH |
2488 | (be32_to_cpu(iclog->ic_header.h_num_logops) == |
2489 | XLOG_COVER_OPS)) { | |
1da177e4 LT |
2490 | changed = 1; |
2491 | } else { | |
2492 | /* | |
2493 | * We have two dirty iclogs so start over | |
2494 | * This could also be num of ops indicates | |
2495 | * this is not the dummy going out. | |
2496 | */ | |
2497 | changed = 2; | |
2498 | } | |
2499 | iclog->ic_header.h_num_logops = 0; | |
2500 | memset(iclog->ic_header.h_cycle_data, 0, | |
2501 | sizeof(iclog->ic_header.h_cycle_data)); | |
2502 | iclog->ic_header.h_lsn = 0; | |
2503 | } else if (iclog->ic_state == XLOG_STATE_ACTIVE) | |
2504 | /* do nothing */; | |
2505 | else | |
2506 | break; /* stop cleaning */ | |
2507 | iclog = iclog->ic_next; | |
2508 | } while (iclog != log->l_iclog); | |
2509 | ||
2510 | /* log is locked when we are called */ | |
2511 | /* | |
2512 | * Change state for the dummy log recording. | |
2513 | * We usually go to NEED. But we go to NEED2 if the changed indicates | |
2514 | * we are done writing the dummy record. | |
2515 | * If we are done with the second dummy recored (DONE2), then | |
2516 | * we go to IDLE. | |
2517 | */ | |
2518 | if (changed) { | |
2519 | switch (log->l_covered_state) { | |
2520 | case XLOG_STATE_COVER_IDLE: | |
2521 | case XLOG_STATE_COVER_NEED: | |
2522 | case XLOG_STATE_COVER_NEED2: | |
2523 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2524 | break; | |
2525 | ||
2526 | case XLOG_STATE_COVER_DONE: | |
2527 | if (changed == 1) | |
2528 | log->l_covered_state = XLOG_STATE_COVER_NEED2; | |
2529 | else | |
2530 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2531 | break; | |
2532 | ||
2533 | case XLOG_STATE_COVER_DONE2: | |
2534 | if (changed == 1) | |
2535 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
2536 | else | |
2537 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2538 | break; | |
2539 | ||
2540 | default: | |
2541 | ASSERT(0); | |
2542 | } | |
2543 | } | |
2544 | } /* xlog_state_clean_log */ | |
2545 | ||
2546 | STATIC xfs_lsn_t | |
2547 | xlog_get_lowest_lsn( | |
9a8d2fdb | 2548 | struct xlog *log) |
1da177e4 LT |
2549 | { |
2550 | xlog_in_core_t *lsn_log; | |
2551 | xfs_lsn_t lowest_lsn, lsn; | |
2552 | ||
2553 | lsn_log = log->l_iclog; | |
2554 | lowest_lsn = 0; | |
2555 | do { | |
2556 | if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) { | |
b53e675d | 2557 | lsn = be64_to_cpu(lsn_log->ic_header.h_lsn); |
1da177e4 LT |
2558 | if ((lsn && !lowest_lsn) || |
2559 | (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) { | |
2560 | lowest_lsn = lsn; | |
2561 | } | |
2562 | } | |
2563 | lsn_log = lsn_log->ic_next; | |
2564 | } while (lsn_log != log->l_iclog); | |
014c2544 | 2565 | return lowest_lsn; |
1da177e4 LT |
2566 | } |
2567 | ||
2568 | ||
2569 | STATIC void | |
2570 | xlog_state_do_callback( | |
9a8d2fdb MT |
2571 | struct xlog *log, |
2572 | int aborted, | |
2573 | struct xlog_in_core *ciclog) | |
1da177e4 LT |
2574 | { |
2575 | xlog_in_core_t *iclog; | |
2576 | xlog_in_core_t *first_iclog; /* used to know when we've | |
2577 | * processed all iclogs once */ | |
2578 | xfs_log_callback_t *cb, *cb_next; | |
2579 | int flushcnt = 0; | |
2580 | xfs_lsn_t lowest_lsn; | |
2581 | int ioerrors; /* counter: iclogs with errors */ | |
2582 | int loopdidcallbacks; /* flag: inner loop did callbacks*/ | |
2583 | int funcdidcallbacks; /* flag: function did callbacks */ | |
2584 | int repeats; /* for issuing console warnings if | |
2585 | * looping too many times */ | |
d748c623 | 2586 | int wake = 0; |
1da177e4 | 2587 | |
b22cd72c | 2588 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2589 | first_iclog = iclog = log->l_iclog; |
2590 | ioerrors = 0; | |
2591 | funcdidcallbacks = 0; | |
2592 | repeats = 0; | |
2593 | ||
2594 | do { | |
2595 | /* | |
2596 | * Scan all iclogs starting with the one pointed to by the | |
2597 | * log. Reset this starting point each time the log is | |
2598 | * unlocked (during callbacks). | |
2599 | * | |
2600 | * Keep looping through iclogs until one full pass is made | |
2601 | * without running any callbacks. | |
2602 | */ | |
2603 | first_iclog = log->l_iclog; | |
2604 | iclog = log->l_iclog; | |
2605 | loopdidcallbacks = 0; | |
2606 | repeats++; | |
2607 | ||
2608 | do { | |
2609 | ||
2610 | /* skip all iclogs in the ACTIVE & DIRTY states */ | |
2611 | if (iclog->ic_state & | |
2612 | (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) { | |
2613 | iclog = iclog->ic_next; | |
2614 | continue; | |
2615 | } | |
2616 | ||
2617 | /* | |
2618 | * Between marking a filesystem SHUTDOWN and stopping | |
2619 | * the log, we do flush all iclogs to disk (if there | |
2620 | * wasn't a log I/O error). So, we do want things to | |
2621 | * go smoothly in case of just a SHUTDOWN w/o a | |
2622 | * LOG_IO_ERROR. | |
2623 | */ | |
2624 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
2625 | /* | |
2626 | * Can only perform callbacks in order. Since | |
2627 | * this iclog is not in the DONE_SYNC/ | |
2628 | * DO_CALLBACK state, we skip the rest and | |
2629 | * just try to clean up. If we set our iclog | |
2630 | * to DO_CALLBACK, we will not process it when | |
2631 | * we retry since a previous iclog is in the | |
2632 | * CALLBACK and the state cannot change since | |
b22cd72c | 2633 | * we are holding the l_icloglock. |
1da177e4 LT |
2634 | */ |
2635 | if (!(iclog->ic_state & | |
2636 | (XLOG_STATE_DONE_SYNC | | |
2637 | XLOG_STATE_DO_CALLBACK))) { | |
2638 | if (ciclog && (ciclog->ic_state == | |
2639 | XLOG_STATE_DONE_SYNC)) { | |
2640 | ciclog->ic_state = XLOG_STATE_DO_CALLBACK; | |
2641 | } | |
2642 | break; | |
2643 | } | |
2644 | /* | |
2645 | * We now have an iclog that is in either the | |
2646 | * DO_CALLBACK or DONE_SYNC states. The other | |
2647 | * states (WANT_SYNC, SYNCING, or CALLBACK were | |
2648 | * caught by the above if and are going to | |
2649 | * clean (i.e. we aren't doing their callbacks) | |
2650 | * see the above if. | |
2651 | */ | |
2652 | ||
2653 | /* | |
2654 | * We will do one more check here to see if we | |
2655 | * have chased our tail around. | |
2656 | */ | |
2657 | ||
2658 | lowest_lsn = xlog_get_lowest_lsn(log); | |
b53e675d CH |
2659 | if (lowest_lsn && |
2660 | XFS_LSN_CMP(lowest_lsn, | |
84f3c683 | 2661 | be64_to_cpu(iclog->ic_header.h_lsn)) < 0) { |
1da177e4 LT |
2662 | iclog = iclog->ic_next; |
2663 | continue; /* Leave this iclog for | |
2664 | * another thread */ | |
2665 | } | |
2666 | ||
2667 | iclog->ic_state = XLOG_STATE_CALLBACK; | |
2668 | ||
1da177e4 | 2669 | |
84f3c683 | 2670 | /* |
d35e88fa DC |
2671 | * Completion of a iclog IO does not imply that |
2672 | * a transaction has completed, as transactions | |
2673 | * can be large enough to span many iclogs. We | |
2674 | * cannot change the tail of the log half way | |
2675 | * through a transaction as this may be the only | |
2676 | * transaction in the log and moving th etail to | |
2677 | * point to the middle of it will prevent | |
2678 | * recovery from finding the start of the | |
2679 | * transaction. Hence we should only update the | |
2680 | * last_sync_lsn if this iclog contains | |
2681 | * transaction completion callbacks on it. | |
2682 | * | |
2683 | * We have to do this before we drop the | |
84f3c683 DC |
2684 | * icloglock to ensure we are the only one that |
2685 | * can update it. | |
1da177e4 | 2686 | */ |
84f3c683 DC |
2687 | ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn), |
2688 | be64_to_cpu(iclog->ic_header.h_lsn)) <= 0); | |
d35e88fa DC |
2689 | if (iclog->ic_callback) |
2690 | atomic64_set(&log->l_last_sync_lsn, | |
2691 | be64_to_cpu(iclog->ic_header.h_lsn)); | |
1da177e4 | 2692 | |
84f3c683 | 2693 | } else |
1da177e4 | 2694 | ioerrors++; |
84f3c683 DC |
2695 | |
2696 | spin_unlock(&log->l_icloglock); | |
1da177e4 | 2697 | |
114d23aa DC |
2698 | /* |
2699 | * Keep processing entries in the callback list until | |
2700 | * we come around and it is empty. We need to | |
2701 | * atomically see that the list is empty and change the | |
2702 | * state to DIRTY so that we don't miss any more | |
2703 | * callbacks being added. | |
2704 | */ | |
2705 | spin_lock(&iclog->ic_callback_lock); | |
2706 | cb = iclog->ic_callback; | |
4b80916b | 2707 | while (cb) { |
1da177e4 LT |
2708 | iclog->ic_callback_tail = &(iclog->ic_callback); |
2709 | iclog->ic_callback = NULL; | |
114d23aa | 2710 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 LT |
2711 | |
2712 | /* perform callbacks in the order given */ | |
4b80916b | 2713 | for (; cb; cb = cb_next) { |
1da177e4 LT |
2714 | cb_next = cb->cb_next; |
2715 | cb->cb_func(cb->cb_arg, aborted); | |
2716 | } | |
114d23aa | 2717 | spin_lock(&iclog->ic_callback_lock); |
1da177e4 LT |
2718 | cb = iclog->ic_callback; |
2719 | } | |
2720 | ||
2721 | loopdidcallbacks++; | |
2722 | funcdidcallbacks++; | |
2723 | ||
114d23aa | 2724 | spin_lock(&log->l_icloglock); |
4b80916b | 2725 | ASSERT(iclog->ic_callback == NULL); |
114d23aa | 2726 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 LT |
2727 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) |
2728 | iclog->ic_state = XLOG_STATE_DIRTY; | |
2729 | ||
2730 | /* | |
2731 | * Transition from DIRTY to ACTIVE if applicable. | |
2732 | * NOP if STATE_IOERROR. | |
2733 | */ | |
2734 | xlog_state_clean_log(log); | |
2735 | ||
2736 | /* wake up threads waiting in xfs_log_force() */ | |
eb40a875 | 2737 | wake_up_all(&iclog->ic_force_wait); |
1da177e4 LT |
2738 | |
2739 | iclog = iclog->ic_next; | |
2740 | } while (first_iclog != iclog); | |
a3c6685e NS |
2741 | |
2742 | if (repeats > 5000) { | |
2743 | flushcnt += repeats; | |
2744 | repeats = 0; | |
a0fa2b67 | 2745 | xfs_warn(log->l_mp, |
a3c6685e | 2746 | "%s: possible infinite loop (%d iterations)", |
34a622b2 | 2747 | __func__, flushcnt); |
1da177e4 LT |
2748 | } |
2749 | } while (!ioerrors && loopdidcallbacks); | |
2750 | ||
2751 | /* | |
2752 | * make one last gasp attempt to see if iclogs are being left in | |
2753 | * limbo.. | |
2754 | */ | |
2755 | #ifdef DEBUG | |
2756 | if (funcdidcallbacks) { | |
2757 | first_iclog = iclog = log->l_iclog; | |
2758 | do { | |
2759 | ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); | |
2760 | /* | |
2761 | * Terminate the loop if iclogs are found in states | |
2762 | * which will cause other threads to clean up iclogs. | |
2763 | * | |
2764 | * SYNCING - i/o completion will go through logs | |
2765 | * DONE_SYNC - interrupt thread should be waiting for | |
b22cd72c | 2766 | * l_icloglock |
1da177e4 LT |
2767 | * IOERROR - give up hope all ye who enter here |
2768 | */ | |
2769 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC || | |
2770 | iclog->ic_state == XLOG_STATE_SYNCING || | |
2771 | iclog->ic_state == XLOG_STATE_DONE_SYNC || | |
2772 | iclog->ic_state == XLOG_STATE_IOERROR ) | |
2773 | break; | |
2774 | iclog = iclog->ic_next; | |
2775 | } while (first_iclog != iclog); | |
2776 | } | |
2777 | #endif | |
2778 | ||
d748c623 MW |
2779 | if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) |
2780 | wake = 1; | |
b22cd72c | 2781 | spin_unlock(&log->l_icloglock); |
d748c623 MW |
2782 | |
2783 | if (wake) | |
eb40a875 | 2784 | wake_up_all(&log->l_flush_wait); |
d748c623 | 2785 | } |
1da177e4 LT |
2786 | |
2787 | ||
2788 | /* | |
2789 | * Finish transitioning this iclog to the dirty state. | |
2790 | * | |
2791 | * Make sure that we completely execute this routine only when this is | |
2792 | * the last call to the iclog. There is a good chance that iclog flushes, | |
2793 | * when we reach the end of the physical log, get turned into 2 separate | |
2794 | * calls to bwrite. Hence, one iclog flush could generate two calls to this | |
2795 | * routine. By using the reference count bwritecnt, we guarantee that only | |
2796 | * the second completion goes through. | |
2797 | * | |
2798 | * Callbacks could take time, so they are done outside the scope of the | |
12017faf | 2799 | * global state machine log lock. |
1da177e4 | 2800 | */ |
a8272ce0 | 2801 | STATIC void |
1da177e4 LT |
2802 | xlog_state_done_syncing( |
2803 | xlog_in_core_t *iclog, | |
2804 | int aborted) | |
2805 | { | |
9a8d2fdb | 2806 | struct xlog *log = iclog->ic_log; |
1da177e4 | 2807 | |
b22cd72c | 2808 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2809 | |
2810 | ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || | |
2811 | iclog->ic_state == XLOG_STATE_IOERROR); | |
155cc6b7 | 2812 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 LT |
2813 | ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2); |
2814 | ||
2815 | ||
2816 | /* | |
2817 | * If we got an error, either on the first buffer, or in the case of | |
2818 | * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, | |
2819 | * and none should ever be attempted to be written to disk | |
2820 | * again. | |
2821 | */ | |
2822 | if (iclog->ic_state != XLOG_STATE_IOERROR) { | |
2823 | if (--iclog->ic_bwritecnt == 1) { | |
b22cd72c | 2824 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2825 | return; |
2826 | } | |
2827 | iclog->ic_state = XLOG_STATE_DONE_SYNC; | |
2828 | } | |
2829 | ||
2830 | /* | |
2831 | * Someone could be sleeping prior to writing out the next | |
2832 | * iclog buffer, we wake them all, one will get to do the | |
2833 | * I/O, the others get to wait for the result. | |
2834 | */ | |
eb40a875 | 2835 | wake_up_all(&iclog->ic_write_wait); |
b22cd72c | 2836 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2837 | xlog_state_do_callback(log, aborted, iclog); /* also cleans log */ |
2838 | } /* xlog_state_done_syncing */ | |
2839 | ||
2840 | ||
2841 | /* | |
2842 | * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must | |
12017faf DC |
2843 | * sleep. We wait on the flush queue on the head iclog as that should be |
2844 | * the first iclog to complete flushing. Hence if all iclogs are syncing, | |
2845 | * we will wait here and all new writes will sleep until a sync completes. | |
1da177e4 LT |
2846 | * |
2847 | * The in-core logs are used in a circular fashion. They are not used | |
2848 | * out-of-order even when an iclog past the head is free. | |
2849 | * | |
2850 | * return: | |
2851 | * * log_offset where xlog_write() can start writing into the in-core | |
2852 | * log's data space. | |
2853 | * * in-core log pointer to which xlog_write() should write. | |
2854 | * * boolean indicating this is a continued write to an in-core log. | |
2855 | * If this is the last write, then the in-core log's offset field | |
2856 | * needs to be incremented, depending on the amount of data which | |
2857 | * is copied. | |
2858 | */ | |
a8272ce0 | 2859 | STATIC int |
9a8d2fdb MT |
2860 | xlog_state_get_iclog_space( |
2861 | struct xlog *log, | |
2862 | int len, | |
2863 | struct xlog_in_core **iclogp, | |
2864 | struct xlog_ticket *ticket, | |
2865 | int *continued_write, | |
2866 | int *logoffsetp) | |
1da177e4 | 2867 | { |
1da177e4 LT |
2868 | int log_offset; |
2869 | xlog_rec_header_t *head; | |
2870 | xlog_in_core_t *iclog; | |
2871 | int error; | |
2872 | ||
2873 | restart: | |
b22cd72c | 2874 | spin_lock(&log->l_icloglock); |
1da177e4 | 2875 | if (XLOG_FORCED_SHUTDOWN(log)) { |
b22cd72c | 2876 | spin_unlock(&log->l_icloglock); |
2451337d | 2877 | return -EIO; |
1da177e4 LT |
2878 | } |
2879 | ||
2880 | iclog = log->l_iclog; | |
d748c623 | 2881 | if (iclog->ic_state != XLOG_STATE_ACTIVE) { |
1da177e4 | 2882 | XFS_STATS_INC(xs_log_noiclogs); |
d748c623 MW |
2883 | |
2884 | /* Wait for log writes to have flushed */ | |
eb40a875 | 2885 | xlog_wait(&log->l_flush_wait, &log->l_icloglock); |
1da177e4 LT |
2886 | goto restart; |
2887 | } | |
d748c623 | 2888 | |
1da177e4 LT |
2889 | head = &iclog->ic_header; |
2890 | ||
155cc6b7 | 2891 | atomic_inc(&iclog->ic_refcnt); /* prevents sync */ |
1da177e4 LT |
2892 | log_offset = iclog->ic_offset; |
2893 | ||
2894 | /* On the 1st write to an iclog, figure out lsn. This works | |
2895 | * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are | |
2896 | * committing to. If the offset is set, that's how many blocks | |
2897 | * must be written. | |
2898 | */ | |
2899 | if (log_offset == 0) { | |
2900 | ticket->t_curr_res -= log->l_iclog_hsize; | |
0adba536 | 2901 | xlog_tic_add_region(ticket, |
7e9c6396 TS |
2902 | log->l_iclog_hsize, |
2903 | XLOG_REG_TYPE_LRHEADER); | |
b53e675d CH |
2904 | head->h_cycle = cpu_to_be32(log->l_curr_cycle); |
2905 | head->h_lsn = cpu_to_be64( | |
03bea6fe | 2906 | xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block)); |
1da177e4 LT |
2907 | ASSERT(log->l_curr_block >= 0); |
2908 | } | |
2909 | ||
2910 | /* If there is enough room to write everything, then do it. Otherwise, | |
2911 | * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC | |
2912 | * bit is on, so this will get flushed out. Don't update ic_offset | |
2913 | * until you know exactly how many bytes get copied. Therefore, wait | |
2914 | * until later to update ic_offset. | |
2915 | * | |
2916 | * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's | |
2917 | * can fit into remaining data section. | |
2918 | */ | |
2919 | if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { | |
2920 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2921 | ||
49641f1a DC |
2922 | /* |
2923 | * If I'm the only one writing to this iclog, sync it to disk. | |
2924 | * We need to do an atomic compare and decrement here to avoid | |
2925 | * racing with concurrent atomic_dec_and_lock() calls in | |
2926 | * xlog_state_release_iclog() when there is more than one | |
2927 | * reference to the iclog. | |
2928 | */ | |
2929 | if (!atomic_add_unless(&iclog->ic_refcnt, -1, 1)) { | |
2930 | /* we are the only one */ | |
b22cd72c | 2931 | spin_unlock(&log->l_icloglock); |
49641f1a DC |
2932 | error = xlog_state_release_iclog(log, iclog); |
2933 | if (error) | |
014c2544 | 2934 | return error; |
1da177e4 | 2935 | } else { |
b22cd72c | 2936 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2937 | } |
2938 | goto restart; | |
2939 | } | |
2940 | ||
2941 | /* Do we have enough room to write the full amount in the remainder | |
2942 | * of this iclog? Or must we continue a write on the next iclog and | |
2943 | * mark this iclog as completely taken? In the case where we switch | |
2944 | * iclogs (to mark it taken), this particular iclog will release/sync | |
2945 | * to disk in xlog_write(). | |
2946 | */ | |
2947 | if (len <= iclog->ic_size - iclog->ic_offset) { | |
2948 | *continued_write = 0; | |
2949 | iclog->ic_offset += len; | |
2950 | } else { | |
2951 | *continued_write = 1; | |
2952 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2953 | } | |
2954 | *iclogp = iclog; | |
2955 | ||
2956 | ASSERT(iclog->ic_offset <= iclog->ic_size); | |
b22cd72c | 2957 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2958 | |
2959 | *logoffsetp = log_offset; | |
2960 | return 0; | |
2961 | } /* xlog_state_get_iclog_space */ | |
2962 | ||
1da177e4 LT |
2963 | /* The first cnt-1 times through here we don't need to |
2964 | * move the grant write head because the permanent | |
2965 | * reservation has reserved cnt times the unit amount. | |
2966 | * Release part of current permanent unit reservation and | |
2967 | * reset current reservation to be one units worth. Also | |
2968 | * move grant reservation head forward. | |
2969 | */ | |
2970 | STATIC void | |
9a8d2fdb MT |
2971 | xlog_regrant_reserve_log_space( |
2972 | struct xlog *log, | |
2973 | struct xlog_ticket *ticket) | |
1da177e4 | 2974 | { |
0b1b213f CH |
2975 | trace_xfs_log_regrant_reserve_enter(log, ticket); |
2976 | ||
1da177e4 LT |
2977 | if (ticket->t_cnt > 0) |
2978 | ticket->t_cnt--; | |
2979 | ||
28496968 | 2980 | xlog_grant_sub_space(log, &log->l_reserve_head.grant, |
a69ed03c | 2981 | ticket->t_curr_res); |
28496968 | 2982 | xlog_grant_sub_space(log, &log->l_write_head.grant, |
a69ed03c | 2983 | ticket->t_curr_res); |
1da177e4 | 2984 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 2985 | xlog_tic_reset_res(ticket); |
0b1b213f CH |
2986 | |
2987 | trace_xfs_log_regrant_reserve_sub(log, ticket); | |
2988 | ||
1da177e4 | 2989 | /* just return if we still have some of the pre-reserved space */ |
d0eb2f38 | 2990 | if (ticket->t_cnt > 0) |
1da177e4 | 2991 | return; |
1da177e4 | 2992 | |
28496968 | 2993 | xlog_grant_add_space(log, &log->l_reserve_head.grant, |
a69ed03c | 2994 | ticket->t_unit_res); |
0b1b213f CH |
2995 | |
2996 | trace_xfs_log_regrant_reserve_exit(log, ticket); | |
2997 | ||
1da177e4 | 2998 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 2999 | xlog_tic_reset_res(ticket); |
1da177e4 LT |
3000 | } /* xlog_regrant_reserve_log_space */ |
3001 | ||
3002 | ||
3003 | /* | |
3004 | * Give back the space left from a reservation. | |
3005 | * | |
3006 | * All the information we need to make a correct determination of space left | |
3007 | * is present. For non-permanent reservations, things are quite easy. The | |
3008 | * count should have been decremented to zero. We only need to deal with the | |
3009 | * space remaining in the current reservation part of the ticket. If the | |
3010 | * ticket contains a permanent reservation, there may be left over space which | |
3011 | * needs to be released. A count of N means that N-1 refills of the current | |
3012 | * reservation can be done before we need to ask for more space. The first | |
3013 | * one goes to fill up the first current reservation. Once we run out of | |
3014 | * space, the count will stay at zero and the only space remaining will be | |
3015 | * in the current reservation field. | |
3016 | */ | |
3017 | STATIC void | |
9a8d2fdb MT |
3018 | xlog_ungrant_log_space( |
3019 | struct xlog *log, | |
3020 | struct xlog_ticket *ticket) | |
1da177e4 | 3021 | { |
663e496a DC |
3022 | int bytes; |
3023 | ||
1da177e4 LT |
3024 | if (ticket->t_cnt > 0) |
3025 | ticket->t_cnt--; | |
3026 | ||
0b1b213f | 3027 | trace_xfs_log_ungrant_enter(log, ticket); |
0b1b213f | 3028 | trace_xfs_log_ungrant_sub(log, ticket); |
1da177e4 | 3029 | |
663e496a DC |
3030 | /* |
3031 | * If this is a permanent reservation ticket, we may be able to free | |
1da177e4 LT |
3032 | * up more space based on the remaining count. |
3033 | */ | |
663e496a | 3034 | bytes = ticket->t_curr_res; |
1da177e4 LT |
3035 | if (ticket->t_cnt > 0) { |
3036 | ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); | |
663e496a | 3037 | bytes += ticket->t_unit_res*ticket->t_cnt; |
1da177e4 LT |
3038 | } |
3039 | ||
28496968 CH |
3040 | xlog_grant_sub_space(log, &log->l_reserve_head.grant, bytes); |
3041 | xlog_grant_sub_space(log, &log->l_write_head.grant, bytes); | |
663e496a | 3042 | |
0b1b213f CH |
3043 | trace_xfs_log_ungrant_exit(log, ticket); |
3044 | ||
cfb7cdca | 3045 | xfs_log_space_wake(log->l_mp); |
09a423a3 | 3046 | } |
1da177e4 | 3047 | |
1da177e4 LT |
3048 | /* |
3049 | * Flush iclog to disk if this is the last reference to the given iclog and | |
3050 | * the WANT_SYNC bit is set. | |
3051 | * | |
3052 | * When this function is entered, the iclog is not necessarily in the | |
3053 | * WANT_SYNC state. It may be sitting around waiting to get filled. | |
3054 | * | |
3055 | * | |
3056 | */ | |
a8272ce0 | 3057 | STATIC int |
b589334c | 3058 | xlog_state_release_iclog( |
9a8d2fdb MT |
3059 | struct xlog *log, |
3060 | struct xlog_in_core *iclog) | |
1da177e4 | 3061 | { |
1da177e4 LT |
3062 | int sync = 0; /* do we sync? */ |
3063 | ||
155cc6b7 | 3064 | if (iclog->ic_state & XLOG_STATE_IOERROR) |
2451337d | 3065 | return -EIO; |
155cc6b7 DC |
3066 | |
3067 | ASSERT(atomic_read(&iclog->ic_refcnt) > 0); | |
3068 | if (!atomic_dec_and_lock(&iclog->ic_refcnt, &log->l_icloglock)) | |
3069 | return 0; | |
3070 | ||
1da177e4 | 3071 | if (iclog->ic_state & XLOG_STATE_IOERROR) { |
b22cd72c | 3072 | spin_unlock(&log->l_icloglock); |
2451337d | 3073 | return -EIO; |
1da177e4 | 3074 | } |
1da177e4 LT |
3075 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || |
3076 | iclog->ic_state == XLOG_STATE_WANT_SYNC); | |
3077 | ||
155cc6b7 | 3078 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC) { |
b589334c | 3079 | /* update tail before writing to iclog */ |
1c3cb9ec | 3080 | xfs_lsn_t tail_lsn = xlog_assign_tail_lsn(log->l_mp); |
1da177e4 LT |
3081 | sync++; |
3082 | iclog->ic_state = XLOG_STATE_SYNCING; | |
1c3cb9ec DC |
3083 | iclog->ic_header.h_tail_lsn = cpu_to_be64(tail_lsn); |
3084 | xlog_verify_tail_lsn(log, iclog, tail_lsn); | |
1da177e4 LT |
3085 | /* cycle incremented when incrementing curr_block */ |
3086 | } | |
b22cd72c | 3087 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3088 | |
3089 | /* | |
3090 | * We let the log lock go, so it's possible that we hit a log I/O | |
c41564b5 | 3091 | * error or some other SHUTDOWN condition that marks the iclog |
1da177e4 LT |
3092 | * as XLOG_STATE_IOERROR before the bwrite. However, we know that |
3093 | * this iclog has consistent data, so we ignore IOERROR | |
3094 | * flags after this point. | |
3095 | */ | |
b589334c | 3096 | if (sync) |
1da177e4 | 3097 | return xlog_sync(log, iclog); |
014c2544 | 3098 | return 0; |
1da177e4 LT |
3099 | } /* xlog_state_release_iclog */ |
3100 | ||
3101 | ||
3102 | /* | |
3103 | * This routine will mark the current iclog in the ring as WANT_SYNC | |
3104 | * and move the current iclog pointer to the next iclog in the ring. | |
3105 | * When this routine is called from xlog_state_get_iclog_space(), the | |
3106 | * exact size of the iclog has not yet been determined. All we know is | |
3107 | * that every data block. We have run out of space in this log record. | |
3108 | */ | |
3109 | STATIC void | |
9a8d2fdb MT |
3110 | xlog_state_switch_iclogs( |
3111 | struct xlog *log, | |
3112 | struct xlog_in_core *iclog, | |
3113 | int eventual_size) | |
1da177e4 LT |
3114 | { |
3115 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); | |
3116 | if (!eventual_size) | |
3117 | eventual_size = iclog->ic_offset; | |
3118 | iclog->ic_state = XLOG_STATE_WANT_SYNC; | |
b53e675d | 3119 | iclog->ic_header.h_prev_block = cpu_to_be32(log->l_prev_block); |
1da177e4 LT |
3120 | log->l_prev_block = log->l_curr_block; |
3121 | log->l_prev_cycle = log->l_curr_cycle; | |
3122 | ||
3123 | /* roll log?: ic_offset changed later */ | |
3124 | log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); | |
3125 | ||
3126 | /* Round up to next log-sunit */ | |
62118709 | 3127 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && |
1da177e4 LT |
3128 | log->l_mp->m_sb.sb_logsunit > 1) { |
3129 | __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); | |
3130 | log->l_curr_block = roundup(log->l_curr_block, sunit_bb); | |
3131 | } | |
3132 | ||
3133 | if (log->l_curr_block >= log->l_logBBsize) { | |
3134 | log->l_curr_cycle++; | |
3135 | if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) | |
3136 | log->l_curr_cycle++; | |
3137 | log->l_curr_block -= log->l_logBBsize; | |
3138 | ASSERT(log->l_curr_block >= 0); | |
3139 | } | |
3140 | ASSERT(iclog == log->l_iclog); | |
3141 | log->l_iclog = iclog->ic_next; | |
3142 | } /* xlog_state_switch_iclogs */ | |
3143 | ||
1da177e4 LT |
3144 | /* |
3145 | * Write out all data in the in-core log as of this exact moment in time. | |
3146 | * | |
3147 | * Data may be written to the in-core log during this call. However, | |
3148 | * we don't guarantee this data will be written out. A change from past | |
3149 | * implementation means this routine will *not* write out zero length LRs. | |
3150 | * | |
3151 | * Basically, we try and perform an intelligent scan of the in-core logs. | |
3152 | * If we determine there is no flushable data, we just return. There is no | |
3153 | * flushable data if: | |
3154 | * | |
3155 | * 1. the current iclog is active and has no data; the previous iclog | |
3156 | * is in the active or dirty state. | |
3157 | * 2. the current iclog is drity, and the previous iclog is in the | |
3158 | * active or dirty state. | |
3159 | * | |
12017faf | 3160 | * We may sleep if: |
1da177e4 LT |
3161 | * |
3162 | * 1. the current iclog is not in the active nor dirty state. | |
3163 | * 2. the current iclog dirty, and the previous iclog is not in the | |
3164 | * active nor dirty state. | |
3165 | * 3. the current iclog is active, and there is another thread writing | |
3166 | * to this particular iclog. | |
3167 | * 4. a) the current iclog is active and has no other writers | |
3168 | * b) when we return from flushing out this iclog, it is still | |
3169 | * not in the active nor dirty state. | |
3170 | */ | |
a14a348b CH |
3171 | int |
3172 | _xfs_log_force( | |
3173 | struct xfs_mount *mp, | |
3174 | uint flags, | |
3175 | int *log_flushed) | |
1da177e4 | 3176 | { |
ad223e60 | 3177 | struct xlog *log = mp->m_log; |
a14a348b CH |
3178 | struct xlog_in_core *iclog; |
3179 | xfs_lsn_t lsn; | |
3180 | ||
3181 | XFS_STATS_INC(xs_log_force); | |
1da177e4 | 3182 | |
93b8a585 | 3183 | xlog_cil_force(log); |
71e330b5 | 3184 | |
b22cd72c | 3185 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3186 | |
3187 | iclog = log->l_iclog; | |
3188 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 3189 | spin_unlock(&log->l_icloglock); |
2451337d | 3190 | return -EIO; |
1da177e4 LT |
3191 | } |
3192 | ||
3193 | /* If the head iclog is not active nor dirty, we just attach | |
3194 | * ourselves to the head and go to sleep. | |
3195 | */ | |
3196 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
3197 | iclog->ic_state == XLOG_STATE_DIRTY) { | |
3198 | /* | |
3199 | * If the head is dirty or (active and empty), then | |
3200 | * we need to look at the previous iclog. If the previous | |
3201 | * iclog is active or dirty we are done. There is nothing | |
3202 | * to sync out. Otherwise, we attach ourselves to the | |
3203 | * previous iclog and go to sleep. | |
3204 | */ | |
3205 | if (iclog->ic_state == XLOG_STATE_DIRTY || | |
155cc6b7 DC |
3206 | (atomic_read(&iclog->ic_refcnt) == 0 |
3207 | && iclog->ic_offset == 0)) { | |
1da177e4 LT |
3208 | iclog = iclog->ic_prev; |
3209 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
3210 | iclog->ic_state == XLOG_STATE_DIRTY) | |
3211 | goto no_sleep; | |
3212 | else | |
3213 | goto maybe_sleep; | |
3214 | } else { | |
155cc6b7 | 3215 | if (atomic_read(&iclog->ic_refcnt) == 0) { |
1da177e4 LT |
3216 | /* We are the only one with access to this |
3217 | * iclog. Flush it out now. There should | |
3218 | * be a roundoff of zero to show that someone | |
3219 | * has already taken care of the roundoff from | |
3220 | * the previous sync. | |
3221 | */ | |
155cc6b7 | 3222 | atomic_inc(&iclog->ic_refcnt); |
b53e675d | 3223 | lsn = be64_to_cpu(iclog->ic_header.h_lsn); |
1da177e4 | 3224 | xlog_state_switch_iclogs(log, iclog, 0); |
b22cd72c | 3225 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3226 | |
3227 | if (xlog_state_release_iclog(log, iclog)) | |
2451337d | 3228 | return -EIO; |
a14a348b CH |
3229 | |
3230 | if (log_flushed) | |
3231 | *log_flushed = 1; | |
b22cd72c | 3232 | spin_lock(&log->l_icloglock); |
b53e675d | 3233 | if (be64_to_cpu(iclog->ic_header.h_lsn) == lsn && |
1da177e4 LT |
3234 | iclog->ic_state != XLOG_STATE_DIRTY) |
3235 | goto maybe_sleep; | |
3236 | else | |
3237 | goto no_sleep; | |
3238 | } else { | |
3239 | /* Someone else is writing to this iclog. | |
3240 | * Use its call to flush out the data. However, | |
3241 | * the other thread may not force out this LR, | |
3242 | * so we mark it WANT_SYNC. | |
3243 | */ | |
3244 | xlog_state_switch_iclogs(log, iclog, 0); | |
3245 | goto maybe_sleep; | |
3246 | } | |
3247 | } | |
3248 | } | |
3249 | ||
3250 | /* By the time we come around again, the iclog could've been filled | |
3251 | * which would give it another lsn. If we have a new lsn, just | |
3252 | * return because the relevant data has been flushed. | |
3253 | */ | |
3254 | maybe_sleep: | |
3255 | if (flags & XFS_LOG_SYNC) { | |
3256 | /* | |
3257 | * We must check if we're shutting down here, before | |
b22cd72c | 3258 | * we wait, while we're holding the l_icloglock. |
1da177e4 LT |
3259 | * Then we check again after waking up, in case our |
3260 | * sleep was disturbed by a bad news. | |
3261 | */ | |
3262 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 3263 | spin_unlock(&log->l_icloglock); |
2451337d | 3264 | return -EIO; |
1da177e4 LT |
3265 | } |
3266 | XFS_STATS_INC(xs_log_force_sleep); | |
eb40a875 | 3267 | xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); |
1da177e4 LT |
3268 | /* |
3269 | * No need to grab the log lock here since we're | |
3270 | * only deciding whether or not to return EIO | |
3271 | * and the memory read should be atomic. | |
3272 | */ | |
3273 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
2451337d | 3274 | return -EIO; |
a14a348b CH |
3275 | if (log_flushed) |
3276 | *log_flushed = 1; | |
1da177e4 LT |
3277 | } else { |
3278 | ||
3279 | no_sleep: | |
b22cd72c | 3280 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3281 | } |
3282 | return 0; | |
a14a348b | 3283 | } |
1da177e4 | 3284 | |
a14a348b CH |
3285 | /* |
3286 | * Wrapper for _xfs_log_force(), to be used when caller doesn't care | |
3287 | * about errors or whether the log was flushed or not. This is the normal | |
3288 | * interface to use when trying to unpin items or move the log forward. | |
3289 | */ | |
3290 | void | |
3291 | xfs_log_force( | |
3292 | xfs_mount_t *mp, | |
3293 | uint flags) | |
3294 | { | |
3295 | int error; | |
3296 | ||
14c26c6a | 3297 | trace_xfs_log_force(mp, 0); |
a14a348b | 3298 | error = _xfs_log_force(mp, flags, NULL); |
a0fa2b67 DC |
3299 | if (error) |
3300 | xfs_warn(mp, "%s: error %d returned.", __func__, error); | |
a14a348b | 3301 | } |
1da177e4 LT |
3302 | |
3303 | /* | |
a14a348b | 3304 | * Force the in-core log to disk for a specific LSN. |
1da177e4 LT |
3305 | * |
3306 | * Find in-core log with lsn. | |
3307 | * If it is in the DIRTY state, just return. | |
3308 | * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC | |
3309 | * state and go to sleep or return. | |
3310 | * If it is in any other state, go to sleep or return. | |
3311 | * | |
a14a348b CH |
3312 | * Synchronous forces are implemented with a signal variable. All callers |
3313 | * to force a given lsn to disk will wait on a the sv attached to the | |
3314 | * specific in-core log. When given in-core log finally completes its | |
3315 | * write to disk, that thread will wake up all threads waiting on the | |
3316 | * sv. | |
1da177e4 | 3317 | */ |
a14a348b CH |
3318 | int |
3319 | _xfs_log_force_lsn( | |
3320 | struct xfs_mount *mp, | |
3321 | xfs_lsn_t lsn, | |
3322 | uint flags, | |
3323 | int *log_flushed) | |
1da177e4 | 3324 | { |
ad223e60 | 3325 | struct xlog *log = mp->m_log; |
a14a348b CH |
3326 | struct xlog_in_core *iclog; |
3327 | int already_slept = 0; | |
1da177e4 | 3328 | |
a14a348b | 3329 | ASSERT(lsn != 0); |
1da177e4 | 3330 | |
a14a348b | 3331 | XFS_STATS_INC(xs_log_force); |
1da177e4 | 3332 | |
93b8a585 CH |
3333 | lsn = xlog_cil_force_lsn(log, lsn); |
3334 | if (lsn == NULLCOMMITLSN) | |
3335 | return 0; | |
71e330b5 | 3336 | |
a14a348b CH |
3337 | try_again: |
3338 | spin_lock(&log->l_icloglock); | |
3339 | iclog = log->l_iclog; | |
3340 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 3341 | spin_unlock(&log->l_icloglock); |
2451337d | 3342 | return -EIO; |
1da177e4 LT |
3343 | } |
3344 | ||
a14a348b CH |
3345 | do { |
3346 | if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) { | |
3347 | iclog = iclog->ic_next; | |
3348 | continue; | |
3349 | } | |
3350 | ||
3351 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
3352 | spin_unlock(&log->l_icloglock); | |
3353 | return 0; | |
3354 | } | |
3355 | ||
3356 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3357 | /* | |
3358 | * We sleep here if we haven't already slept (e.g. | |
3359 | * this is the first time we've looked at the correct | |
3360 | * iclog buf) and the buffer before us is going to | |
3361 | * be sync'ed. The reason for this is that if we | |
3362 | * are doing sync transactions here, by waiting for | |
3363 | * the previous I/O to complete, we can allow a few | |
3364 | * more transactions into this iclog before we close | |
3365 | * it down. | |
3366 | * | |
3367 | * Otherwise, we mark the buffer WANT_SYNC, and bump | |
3368 | * up the refcnt so we can release the log (which | |
3369 | * drops the ref count). The state switch keeps new | |
3370 | * transaction commits from using this buffer. When | |
3371 | * the current commits finish writing into the buffer, | |
3372 | * the refcount will drop to zero and the buffer will | |
3373 | * go out then. | |
3374 | */ | |
3375 | if (!already_slept && | |
3376 | (iclog->ic_prev->ic_state & | |
3377 | (XLOG_STATE_WANT_SYNC | XLOG_STATE_SYNCING))) { | |
3378 | ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); | |
3379 | ||
3380 | XFS_STATS_INC(xs_log_force_sleep); | |
3381 | ||
eb40a875 DC |
3382 | xlog_wait(&iclog->ic_prev->ic_write_wait, |
3383 | &log->l_icloglock); | |
a14a348b CH |
3384 | if (log_flushed) |
3385 | *log_flushed = 1; | |
3386 | already_slept = 1; | |
3387 | goto try_again; | |
3388 | } | |
155cc6b7 | 3389 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 | 3390 | xlog_state_switch_iclogs(log, iclog, 0); |
b22cd72c | 3391 | spin_unlock(&log->l_icloglock); |
1da177e4 | 3392 | if (xlog_state_release_iclog(log, iclog)) |
2451337d | 3393 | return -EIO; |
a14a348b CH |
3394 | if (log_flushed) |
3395 | *log_flushed = 1; | |
b22cd72c | 3396 | spin_lock(&log->l_icloglock); |
1da177e4 | 3397 | } |
1da177e4 | 3398 | |
a14a348b CH |
3399 | if ((flags & XFS_LOG_SYNC) && /* sleep */ |
3400 | !(iclog->ic_state & | |
3401 | (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) { | |
3402 | /* | |
3403 | * Don't wait on completion if we know that we've | |
3404 | * gotten a log write error. | |
3405 | */ | |
3406 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
3407 | spin_unlock(&log->l_icloglock); | |
2451337d | 3408 | return -EIO; |
a14a348b CH |
3409 | } |
3410 | XFS_STATS_INC(xs_log_force_sleep); | |
eb40a875 | 3411 | xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); |
a14a348b CH |
3412 | /* |
3413 | * No need to grab the log lock here since we're | |
3414 | * only deciding whether or not to return EIO | |
3415 | * and the memory read should be atomic. | |
3416 | */ | |
3417 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
2451337d | 3418 | return -EIO; |
1da177e4 | 3419 | |
a14a348b CH |
3420 | if (log_flushed) |
3421 | *log_flushed = 1; | |
3422 | } else { /* just return */ | |
b22cd72c | 3423 | spin_unlock(&log->l_icloglock); |
1da177e4 | 3424 | } |
1da177e4 | 3425 | |
a14a348b CH |
3426 | return 0; |
3427 | } while (iclog != log->l_iclog); | |
1da177e4 | 3428 | |
a14a348b CH |
3429 | spin_unlock(&log->l_icloglock); |
3430 | return 0; | |
3431 | } | |
3432 | ||
3433 | /* | |
3434 | * Wrapper for _xfs_log_force_lsn(), to be used when caller doesn't care | |
3435 | * about errors or whether the log was flushed or not. This is the normal | |
3436 | * interface to use when trying to unpin items or move the log forward. | |
3437 | */ | |
3438 | void | |
3439 | xfs_log_force_lsn( | |
3440 | xfs_mount_t *mp, | |
3441 | xfs_lsn_t lsn, | |
3442 | uint flags) | |
3443 | { | |
3444 | int error; | |
1da177e4 | 3445 | |
14c26c6a | 3446 | trace_xfs_log_force(mp, lsn); |
a14a348b | 3447 | error = _xfs_log_force_lsn(mp, lsn, flags, NULL); |
a0fa2b67 DC |
3448 | if (error) |
3449 | xfs_warn(mp, "%s: error %d returned.", __func__, error); | |
a14a348b | 3450 | } |
1da177e4 LT |
3451 | |
3452 | /* | |
3453 | * Called when we want to mark the current iclog as being ready to sync to | |
3454 | * disk. | |
3455 | */ | |
a8272ce0 | 3456 | STATIC void |
9a8d2fdb MT |
3457 | xlog_state_want_sync( |
3458 | struct xlog *log, | |
3459 | struct xlog_in_core *iclog) | |
1da177e4 | 3460 | { |
a8914f3a | 3461 | assert_spin_locked(&log->l_icloglock); |
1da177e4 LT |
3462 | |
3463 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3464 | xlog_state_switch_iclogs(log, iclog, 0); | |
3465 | } else { | |
3466 | ASSERT(iclog->ic_state & | |
3467 | (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR)); | |
3468 | } | |
39e2defe | 3469 | } |
1da177e4 LT |
3470 | |
3471 | ||
3472 | /***************************************************************************** | |
3473 | * | |
3474 | * TICKET functions | |
3475 | * | |
3476 | ***************************************************************************** | |
3477 | */ | |
3478 | ||
3479 | /* | |
9da096fd | 3480 | * Free a used ticket when its refcount falls to zero. |
1da177e4 | 3481 | */ |
cc09c0dc DC |
3482 | void |
3483 | xfs_log_ticket_put( | |
3484 | xlog_ticket_t *ticket) | |
1da177e4 | 3485 | { |
cc09c0dc | 3486 | ASSERT(atomic_read(&ticket->t_ref) > 0); |
eb40a875 | 3487 | if (atomic_dec_and_test(&ticket->t_ref)) |
cc09c0dc | 3488 | kmem_zone_free(xfs_log_ticket_zone, ticket); |
cc09c0dc | 3489 | } |
1da177e4 | 3490 | |
cc09c0dc DC |
3491 | xlog_ticket_t * |
3492 | xfs_log_ticket_get( | |
3493 | xlog_ticket_t *ticket) | |
3494 | { | |
3495 | ASSERT(atomic_read(&ticket->t_ref) > 0); | |
3496 | atomic_inc(&ticket->t_ref); | |
3497 | return ticket; | |
3498 | } | |
1da177e4 LT |
3499 | |
3500 | /* | |
e773fc93 JL |
3501 | * Figure out the total log space unit (in bytes) that would be |
3502 | * required for a log ticket. | |
1da177e4 | 3503 | */ |
e773fc93 JL |
3504 | int |
3505 | xfs_log_calc_unit_res( | |
3506 | struct xfs_mount *mp, | |
3507 | int unit_bytes) | |
1da177e4 | 3508 | { |
e773fc93 JL |
3509 | struct xlog *log = mp->m_log; |
3510 | int iclog_space; | |
3511 | uint num_headers; | |
1da177e4 LT |
3512 | |
3513 | /* | |
3514 | * Permanent reservations have up to 'cnt'-1 active log operations | |
3515 | * in the log. A unit in this case is the amount of space for one | |
3516 | * of these log operations. Normal reservations have a cnt of 1 | |
3517 | * and their unit amount is the total amount of space required. | |
3518 | * | |
3519 | * The following lines of code account for non-transaction data | |
32fb9b57 TS |
3520 | * which occupy space in the on-disk log. |
3521 | * | |
3522 | * Normal form of a transaction is: | |
3523 | * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> | |
3524 | * and then there are LR hdrs, split-recs and roundoff at end of syncs. | |
3525 | * | |
3526 | * We need to account for all the leadup data and trailer data | |
3527 | * around the transaction data. | |
3528 | * And then we need to account for the worst case in terms of using | |
3529 | * more space. | |
3530 | * The worst case will happen if: | |
3531 | * - the placement of the transaction happens to be such that the | |
3532 | * roundoff is at its maximum | |
3533 | * - the transaction data is synced before the commit record is synced | |
3534 | * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> | |
3535 | * Therefore the commit record is in its own Log Record. | |
3536 | * This can happen as the commit record is called with its | |
3537 | * own region to xlog_write(). | |
3538 | * This then means that in the worst case, roundoff can happen for | |
3539 | * the commit-rec as well. | |
3540 | * The commit-rec is smaller than padding in this scenario and so it is | |
3541 | * not added separately. | |
1da177e4 LT |
3542 | */ |
3543 | ||
32fb9b57 TS |
3544 | /* for trans header */ |
3545 | unit_bytes += sizeof(xlog_op_header_t); | |
3546 | unit_bytes += sizeof(xfs_trans_header_t); | |
3547 | ||
1da177e4 | 3548 | /* for start-rec */ |
32fb9b57 TS |
3549 | unit_bytes += sizeof(xlog_op_header_t); |
3550 | ||
9b9fc2b7 DC |
3551 | /* |
3552 | * for LR headers - the space for data in an iclog is the size minus | |
3553 | * the space used for the headers. If we use the iclog size, then we | |
3554 | * undercalculate the number of headers required. | |
3555 | * | |
3556 | * Furthermore - the addition of op headers for split-recs might | |
3557 | * increase the space required enough to require more log and op | |
3558 | * headers, so take that into account too. | |
3559 | * | |
3560 | * IMPORTANT: This reservation makes the assumption that if this | |
3561 | * transaction is the first in an iclog and hence has the LR headers | |
3562 | * accounted to it, then the remaining space in the iclog is | |
3563 | * exclusively for this transaction. i.e. if the transaction is larger | |
3564 | * than the iclog, it will be the only thing in that iclog. | |
3565 | * Fundamentally, this means we must pass the entire log vector to | |
3566 | * xlog_write to guarantee this. | |
3567 | */ | |
3568 | iclog_space = log->l_iclog_size - log->l_iclog_hsize; | |
3569 | num_headers = howmany(unit_bytes, iclog_space); | |
3570 | ||
3571 | /* for split-recs - ophdrs added when data split over LRs */ | |
3572 | unit_bytes += sizeof(xlog_op_header_t) * num_headers; | |
3573 | ||
3574 | /* add extra header reservations if we overrun */ | |
3575 | while (!num_headers || | |
3576 | howmany(unit_bytes, iclog_space) > num_headers) { | |
3577 | unit_bytes += sizeof(xlog_op_header_t); | |
3578 | num_headers++; | |
3579 | } | |
32fb9b57 | 3580 | unit_bytes += log->l_iclog_hsize * num_headers; |
1da177e4 | 3581 | |
32fb9b57 TS |
3582 | /* for commit-rec LR header - note: padding will subsume the ophdr */ |
3583 | unit_bytes += log->l_iclog_hsize; | |
3584 | ||
32fb9b57 | 3585 | /* for roundoff padding for transaction data and one for commit record */ |
e773fc93 | 3586 | if (xfs_sb_version_haslogv2(&mp->m_sb) && mp->m_sb.sb_logsunit > 1) { |
1da177e4 | 3587 | /* log su roundoff */ |
e773fc93 | 3588 | unit_bytes += 2 * mp->m_sb.sb_logsunit; |
1da177e4 LT |
3589 | } else { |
3590 | /* BB roundoff */ | |
e773fc93 | 3591 | unit_bytes += 2 * BBSIZE; |
1da177e4 LT |
3592 | } |
3593 | ||
e773fc93 JL |
3594 | return unit_bytes; |
3595 | } | |
3596 | ||
3597 | /* | |
3598 | * Allocate and initialise a new log ticket. | |
3599 | */ | |
3600 | struct xlog_ticket * | |
3601 | xlog_ticket_alloc( | |
3602 | struct xlog *log, | |
3603 | int unit_bytes, | |
3604 | int cnt, | |
3605 | char client, | |
3606 | bool permanent, | |
3607 | xfs_km_flags_t alloc_flags) | |
3608 | { | |
3609 | struct xlog_ticket *tic; | |
3610 | int unit_res; | |
3611 | ||
3612 | tic = kmem_zone_zalloc(xfs_log_ticket_zone, alloc_flags); | |
3613 | if (!tic) | |
3614 | return NULL; | |
3615 | ||
3616 | unit_res = xfs_log_calc_unit_res(log->l_mp, unit_bytes); | |
3617 | ||
cc09c0dc | 3618 | atomic_set(&tic->t_ref, 1); |
14a7235f | 3619 | tic->t_task = current; |
10547941 | 3620 | INIT_LIST_HEAD(&tic->t_queue); |
e773fc93 JL |
3621 | tic->t_unit_res = unit_res; |
3622 | tic->t_curr_res = unit_res; | |
1da177e4 LT |
3623 | tic->t_cnt = cnt; |
3624 | tic->t_ocnt = cnt; | |
ecb3403d | 3625 | tic->t_tid = prandom_u32(); |
1da177e4 LT |
3626 | tic->t_clientid = client; |
3627 | tic->t_flags = XLOG_TIC_INITED; | |
7e9c6396 | 3628 | tic->t_trans_type = 0; |
9006fb91 | 3629 | if (permanent) |
1da177e4 | 3630 | tic->t_flags |= XLOG_TIC_PERM_RESERV; |
1da177e4 | 3631 | |
0adba536 | 3632 | xlog_tic_reset_res(tic); |
7e9c6396 | 3633 | |
1da177e4 | 3634 | return tic; |
cc09c0dc | 3635 | } |
1da177e4 LT |
3636 | |
3637 | ||
3638 | /****************************************************************************** | |
3639 | * | |
3640 | * Log debug routines | |
3641 | * | |
3642 | ****************************************************************************** | |
3643 | */ | |
cfcbbbd0 | 3644 | #if defined(DEBUG) |
1da177e4 LT |
3645 | /* |
3646 | * Make sure that the destination ptr is within the valid data region of | |
3647 | * one of the iclogs. This uses backup pointers stored in a different | |
3648 | * part of the log in case we trash the log structure. | |
3649 | */ | |
3650 | void | |
e6b1f273 | 3651 | xlog_verify_dest_ptr( |
ad223e60 | 3652 | struct xlog *log, |
e6b1f273 | 3653 | char *ptr) |
1da177e4 LT |
3654 | { |
3655 | int i; | |
3656 | int good_ptr = 0; | |
3657 | ||
e6b1f273 CH |
3658 | for (i = 0; i < log->l_iclog_bufs; i++) { |
3659 | if (ptr >= log->l_iclog_bak[i] && | |
3660 | ptr <= log->l_iclog_bak[i] + log->l_iclog_size) | |
1da177e4 LT |
3661 | good_ptr++; |
3662 | } | |
e6b1f273 CH |
3663 | |
3664 | if (!good_ptr) | |
a0fa2b67 | 3665 | xfs_emerg(log->l_mp, "%s: invalid ptr", __func__); |
e6b1f273 | 3666 | } |
1da177e4 | 3667 | |
da8a1a4a DC |
3668 | /* |
3669 | * Check to make sure the grant write head didn't just over lap the tail. If | |
3670 | * the cycles are the same, we can't be overlapping. Otherwise, make sure that | |
3671 | * the cycles differ by exactly one and check the byte count. | |
3672 | * | |
3673 | * This check is run unlocked, so can give false positives. Rather than assert | |
3674 | * on failures, use a warn-once flag and a panic tag to allow the admin to | |
3675 | * determine if they want to panic the machine when such an error occurs. For | |
3676 | * debug kernels this will have the same effect as using an assert but, unlinke | |
3677 | * an assert, it can be turned off at runtime. | |
3678 | */ | |
3f336c6f DC |
3679 | STATIC void |
3680 | xlog_verify_grant_tail( | |
ad223e60 | 3681 | struct xlog *log) |
3f336c6f | 3682 | { |
1c3cb9ec | 3683 | int tail_cycle, tail_blocks; |
a69ed03c | 3684 | int cycle, space; |
3f336c6f | 3685 | |
28496968 | 3686 | xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &space); |
1c3cb9ec DC |
3687 | xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_blocks); |
3688 | if (tail_cycle != cycle) { | |
da8a1a4a DC |
3689 | if (cycle - 1 != tail_cycle && |
3690 | !(log->l_flags & XLOG_TAIL_WARN)) { | |
3691 | xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, | |
3692 | "%s: cycle - 1 != tail_cycle", __func__); | |
3693 | log->l_flags |= XLOG_TAIL_WARN; | |
3694 | } | |
3695 | ||
3696 | if (space > BBTOB(tail_blocks) && | |
3697 | !(log->l_flags & XLOG_TAIL_WARN)) { | |
3698 | xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, | |
3699 | "%s: space > BBTOB(tail_blocks)", __func__); | |
3700 | log->l_flags |= XLOG_TAIL_WARN; | |
3701 | } | |
3f336c6f DC |
3702 | } |
3703 | } | |
3704 | ||
1da177e4 LT |
3705 | /* check if it will fit */ |
3706 | STATIC void | |
9a8d2fdb MT |
3707 | xlog_verify_tail_lsn( |
3708 | struct xlog *log, | |
3709 | struct xlog_in_core *iclog, | |
3710 | xfs_lsn_t tail_lsn) | |
1da177e4 LT |
3711 | { |
3712 | int blocks; | |
3713 | ||
3714 | if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { | |
3715 | blocks = | |
3716 | log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); | |
3717 | if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) | |
a0fa2b67 | 3718 | xfs_emerg(log->l_mp, "%s: ran out of log space", __func__); |
1da177e4 LT |
3719 | } else { |
3720 | ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); | |
3721 | ||
3722 | if (BLOCK_LSN(tail_lsn) == log->l_prev_block) | |
a0fa2b67 | 3723 | xfs_emerg(log->l_mp, "%s: tail wrapped", __func__); |
1da177e4 LT |
3724 | |
3725 | blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; | |
3726 | if (blocks < BTOBB(iclog->ic_offset) + 1) | |
a0fa2b67 | 3727 | xfs_emerg(log->l_mp, "%s: ran out of log space", __func__); |
1da177e4 LT |
3728 | } |
3729 | } /* xlog_verify_tail_lsn */ | |
3730 | ||
3731 | /* | |
3732 | * Perform a number of checks on the iclog before writing to disk. | |
3733 | * | |
3734 | * 1. Make sure the iclogs are still circular | |
3735 | * 2. Make sure we have a good magic number | |
3736 | * 3. Make sure we don't have magic numbers in the data | |
3737 | * 4. Check fields of each log operation header for: | |
3738 | * A. Valid client identifier | |
3739 | * B. tid ptr value falls in valid ptr space (user space code) | |
3740 | * C. Length in log record header is correct according to the | |
3741 | * individual operation headers within record. | |
3742 | * 5. When a bwrite will occur within 5 blocks of the front of the physical | |
3743 | * log, check the preceding blocks of the physical log to make sure all | |
3744 | * the cycle numbers agree with the current cycle number. | |
3745 | */ | |
3746 | STATIC void | |
9a8d2fdb MT |
3747 | xlog_verify_iclog( |
3748 | struct xlog *log, | |
3749 | struct xlog_in_core *iclog, | |
3750 | int count, | |
667a9291 | 3751 | bool syncing) |
1da177e4 LT |
3752 | { |
3753 | xlog_op_header_t *ophead; | |
3754 | xlog_in_core_t *icptr; | |
3755 | xlog_in_core_2_t *xhdr; | |
3756 | xfs_caddr_t ptr; | |
3757 | xfs_caddr_t base_ptr; | |
3758 | __psint_t field_offset; | |
3759 | __uint8_t clientid; | |
3760 | int len, i, j, k, op_len; | |
3761 | int idx; | |
1da177e4 LT |
3762 | |
3763 | /* check validity of iclog pointers */ | |
b22cd72c | 3764 | spin_lock(&log->l_icloglock); |
1da177e4 | 3765 | icptr = log->l_iclog; |
643f7c4e GB |
3766 | for (i = 0; i < log->l_iclog_bufs; i++, icptr = icptr->ic_next) |
3767 | ASSERT(icptr); | |
3768 | ||
1da177e4 | 3769 | if (icptr != log->l_iclog) |
a0fa2b67 | 3770 | xfs_emerg(log->l_mp, "%s: corrupt iclog ring", __func__); |
b22cd72c | 3771 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3772 | |
3773 | /* check log magic numbers */ | |
69ef921b | 3774 | if (iclog->ic_header.h_magicno != cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) |
a0fa2b67 | 3775 | xfs_emerg(log->l_mp, "%s: invalid magic num", __func__); |
1da177e4 | 3776 | |
b53e675d CH |
3777 | ptr = (xfs_caddr_t) &iclog->ic_header; |
3778 | for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&iclog->ic_header) + count; | |
1da177e4 | 3779 | ptr += BBSIZE) { |
69ef921b | 3780 | if (*(__be32 *)ptr == cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) |
a0fa2b67 DC |
3781 | xfs_emerg(log->l_mp, "%s: unexpected magic num", |
3782 | __func__); | |
1da177e4 LT |
3783 | } |
3784 | ||
3785 | /* check fields */ | |
b53e675d | 3786 | len = be32_to_cpu(iclog->ic_header.h_num_logops); |
1da177e4 LT |
3787 | ptr = iclog->ic_datap; |
3788 | base_ptr = ptr; | |
3789 | ophead = (xlog_op_header_t *)ptr; | |
b28708d6 | 3790 | xhdr = iclog->ic_data; |
1da177e4 LT |
3791 | for (i = 0; i < len; i++) { |
3792 | ophead = (xlog_op_header_t *)ptr; | |
3793 | ||
3794 | /* clientid is only 1 byte */ | |
3795 | field_offset = (__psint_t) | |
3796 | ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr); | |
667a9291 | 3797 | if (!syncing || (field_offset & 0x1ff)) { |
1da177e4 LT |
3798 | clientid = ophead->oh_clientid; |
3799 | } else { | |
3800 | idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap); | |
3801 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { | |
3802 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3803 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
03bea6fe CH |
3804 | clientid = xlog_get_client_id( |
3805 | xhdr[j].hic_xheader.xh_cycle_data[k]); | |
1da177e4 | 3806 | } else { |
03bea6fe CH |
3807 | clientid = xlog_get_client_id( |
3808 | iclog->ic_header.h_cycle_data[idx]); | |
1da177e4 LT |
3809 | } |
3810 | } | |
3811 | if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) | |
a0fa2b67 DC |
3812 | xfs_warn(log->l_mp, |
3813 | "%s: invalid clientid %d op 0x%p offset 0x%lx", | |
3814 | __func__, clientid, ophead, | |
3815 | (unsigned long)field_offset); | |
1da177e4 LT |
3816 | |
3817 | /* check length */ | |
3818 | field_offset = (__psint_t) | |
3819 | ((xfs_caddr_t)&(ophead->oh_len) - base_ptr); | |
667a9291 | 3820 | if (!syncing || (field_offset & 0x1ff)) { |
67fcb7bf | 3821 | op_len = be32_to_cpu(ophead->oh_len); |
1da177e4 LT |
3822 | } else { |
3823 | idx = BTOBBT((__psint_t)&ophead->oh_len - | |
3824 | (__psint_t)iclog->ic_datap); | |
3825 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { | |
3826 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3827 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
b53e675d | 3828 | op_len = be32_to_cpu(xhdr[j].hic_xheader.xh_cycle_data[k]); |
1da177e4 | 3829 | } else { |
b53e675d | 3830 | op_len = be32_to_cpu(iclog->ic_header.h_cycle_data[idx]); |
1da177e4 LT |
3831 | } |
3832 | } | |
3833 | ptr += sizeof(xlog_op_header_t) + op_len; | |
3834 | } | |
3835 | } /* xlog_verify_iclog */ | |
cfcbbbd0 | 3836 | #endif |
1da177e4 LT |
3837 | |
3838 | /* | |
b22cd72c | 3839 | * Mark all iclogs IOERROR. l_icloglock is held by the caller. |
1da177e4 LT |
3840 | */ |
3841 | STATIC int | |
3842 | xlog_state_ioerror( | |
9a8d2fdb | 3843 | struct xlog *log) |
1da177e4 LT |
3844 | { |
3845 | xlog_in_core_t *iclog, *ic; | |
3846 | ||
3847 | iclog = log->l_iclog; | |
3848 | if (! (iclog->ic_state & XLOG_STATE_IOERROR)) { | |
3849 | /* | |
3850 | * Mark all the incore logs IOERROR. | |
3851 | * From now on, no log flushes will result. | |
3852 | */ | |
3853 | ic = iclog; | |
3854 | do { | |
3855 | ic->ic_state = XLOG_STATE_IOERROR; | |
3856 | ic = ic->ic_next; | |
3857 | } while (ic != iclog); | |
014c2544 | 3858 | return 0; |
1da177e4 LT |
3859 | } |
3860 | /* | |
3861 | * Return non-zero, if state transition has already happened. | |
3862 | */ | |
014c2544 | 3863 | return 1; |
1da177e4 LT |
3864 | } |
3865 | ||
3866 | /* | |
3867 | * This is called from xfs_force_shutdown, when we're forcibly | |
3868 | * shutting down the filesystem, typically because of an IO error. | |
3869 | * Our main objectives here are to make sure that: | |
a870fe6d DC |
3870 | * a. if !logerror, flush the logs to disk. Anything modified |
3871 | * after this is ignored. | |
3872 | * b. the filesystem gets marked 'SHUTDOWN' for all interested | |
1da177e4 | 3873 | * parties to find out, 'atomically'. |
a870fe6d | 3874 | * c. those who're sleeping on log reservations, pinned objects and |
1da177e4 | 3875 | * other resources get woken up, and be told the bad news. |
a870fe6d | 3876 | * d. nothing new gets queued up after (b) and (c) are done. |
9da1ab18 | 3877 | * |
a870fe6d DC |
3878 | * Note: for the !logerror case we need to flush the regions held in memory out |
3879 | * to disk first. This needs to be done before the log is marked as shutdown, | |
3880 | * otherwise the iclog writes will fail. | |
1da177e4 LT |
3881 | */ |
3882 | int | |
3883 | xfs_log_force_umount( | |
3884 | struct xfs_mount *mp, | |
3885 | int logerror) | |
3886 | { | |
9a8d2fdb | 3887 | struct xlog *log; |
1da177e4 | 3888 | int retval; |
1da177e4 LT |
3889 | |
3890 | log = mp->m_log; | |
3891 | ||
3892 | /* | |
3893 | * If this happens during log recovery, don't worry about | |
3894 | * locking; the log isn't open for business yet. | |
3895 | */ | |
3896 | if (!log || | |
3897 | log->l_flags & XLOG_ACTIVE_RECOVERY) { | |
3898 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; | |
bac8dca9 CH |
3899 | if (mp->m_sb_bp) |
3900 | XFS_BUF_DONE(mp->m_sb_bp); | |
014c2544 | 3901 | return 0; |
1da177e4 LT |
3902 | } |
3903 | ||
3904 | /* | |
3905 | * Somebody could've already done the hard work for us. | |
3906 | * No need to get locks for this. | |
3907 | */ | |
3908 | if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { | |
3909 | ASSERT(XLOG_FORCED_SHUTDOWN(log)); | |
014c2544 | 3910 | return 1; |
1da177e4 | 3911 | } |
9da1ab18 DC |
3912 | |
3913 | /* | |
a870fe6d DC |
3914 | * Flush all the completed transactions to disk before marking the log |
3915 | * being shut down. We need to do it in this order to ensure that | |
3916 | * completed operations are safely on disk before we shut down, and that | |
3917 | * we don't have to issue any buffer IO after the shutdown flags are set | |
3918 | * to guarantee this. | |
9da1ab18 | 3919 | */ |
93b8a585 | 3920 | if (!logerror) |
a870fe6d | 3921 | _xfs_log_force(mp, XFS_LOG_SYNC, NULL); |
9da1ab18 | 3922 | |
1da177e4 | 3923 | /* |
3f16b985 DC |
3924 | * mark the filesystem and the as in a shutdown state and wake |
3925 | * everybody up to tell them the bad news. | |
1da177e4 | 3926 | */ |
b22cd72c | 3927 | spin_lock(&log->l_icloglock); |
1da177e4 | 3928 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; |
bac8dca9 CH |
3929 | if (mp->m_sb_bp) |
3930 | XFS_BUF_DONE(mp->m_sb_bp); | |
3931 | ||
1da177e4 | 3932 | /* |
a870fe6d DC |
3933 | * Mark the log and the iclogs with IO error flags to prevent any |
3934 | * further log IO from being issued or completed. | |
1da177e4 LT |
3935 | */ |
3936 | log->l_flags |= XLOG_IO_ERROR; | |
a870fe6d | 3937 | retval = xlog_state_ioerror(log); |
b22cd72c | 3938 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3939 | |
3940 | /* | |
10547941 DC |
3941 | * We don't want anybody waiting for log reservations after this. That |
3942 | * means we have to wake up everybody queued up on reserveq as well as | |
3943 | * writeq. In addition, we make sure in xlog_{re}grant_log_space that | |
3944 | * we don't enqueue anything once the SHUTDOWN flag is set, and this | |
3f16b985 | 3945 | * action is protected by the grant locks. |
1da177e4 | 3946 | */ |
a79bf2d7 CH |
3947 | xlog_grant_head_wake_all(&log->l_reserve_head); |
3948 | xlog_grant_head_wake_all(&log->l_write_head); | |
1da177e4 | 3949 | |
1da177e4 | 3950 | /* |
ac983517 DC |
3951 | * Wake up everybody waiting on xfs_log_force. Wake the CIL push first |
3952 | * as if the log writes were completed. The abort handling in the log | |
3953 | * item committed callback functions will do this again under lock to | |
3954 | * avoid races. | |
1da177e4 | 3955 | */ |
ac983517 | 3956 | wake_up_all(&log->l_cilp->xc_commit_wait); |
1da177e4 LT |
3957 | xlog_state_do_callback(log, XFS_LI_ABORTED, NULL); |
3958 | ||
3959 | #ifdef XFSERRORDEBUG | |
3960 | { | |
3961 | xlog_in_core_t *iclog; | |
3962 | ||
b22cd72c | 3963 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3964 | iclog = log->l_iclog; |
3965 | do { | |
3966 | ASSERT(iclog->ic_callback == 0); | |
3967 | iclog = iclog->ic_next; | |
3968 | } while (iclog != log->l_iclog); | |
b22cd72c | 3969 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3970 | } |
3971 | #endif | |
3972 | /* return non-zero if log IOERROR transition had already happened */ | |
014c2544 | 3973 | return retval; |
1da177e4 LT |
3974 | } |
3975 | ||
ba0f32d4 | 3976 | STATIC int |
9a8d2fdb MT |
3977 | xlog_iclogs_empty( |
3978 | struct xlog *log) | |
1da177e4 LT |
3979 | { |
3980 | xlog_in_core_t *iclog; | |
3981 | ||
3982 | iclog = log->l_iclog; | |
3983 | do { | |
3984 | /* endianness does not matter here, zero is zero in | |
3985 | * any language. | |
3986 | */ | |
3987 | if (iclog->ic_header.h_num_logops) | |
014c2544 | 3988 | return 0; |
1da177e4 LT |
3989 | iclog = iclog->ic_next; |
3990 | } while (iclog != log->l_iclog); | |
014c2544 | 3991 | return 1; |
1da177e4 | 3992 | } |
f661f1e0 | 3993 |