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0b61f8a4 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
7b718769 NS |
3 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
4 | * All Rights Reserved. | |
1da177e4 | 5 | */ |
1da177e4 | 6 | #include "xfs.h" |
a844f451 | 7 | #include "xfs_fs.h" |
70a9883c | 8 | #include "xfs_shared.h" |
a4fbe6ab | 9 | #include "xfs_format.h" |
239880ef DC |
10 | #include "xfs_log_format.h" |
11 | #include "xfs_trans_resv.h" | |
1da177e4 | 12 | #include "xfs_mount.h" |
e9e899a2 | 13 | #include "xfs_errortag.h" |
1da177e4 | 14 | #include "xfs_error.h" |
239880ef DC |
15 | #include "xfs_trans.h" |
16 | #include "xfs_trans_priv.h" | |
17 | #include "xfs_log.h" | |
1da177e4 | 18 | #include "xfs_log_priv.h" |
0b1b213f | 19 | #include "xfs_trace.h" |
baff4e44 | 20 | #include "xfs_sysfs.h" |
61e63ecb | 21 | #include "xfs_sb.h" |
39353ff6 | 22 | #include "xfs_health.h" |
1da177e4 | 23 | |
eb01c9cd | 24 | kmem_zone_t *xfs_log_ticket_zone; |
1da177e4 | 25 | |
1da177e4 | 26 | /* Local miscellaneous function prototypes */ |
ad223e60 MT |
27 | STATIC int |
28 | xlog_commit_record( | |
29 | struct xlog *log, | |
30 | struct xlog_ticket *ticket, | |
31 | struct xlog_in_core **iclog, | |
32 | xfs_lsn_t *commitlsnp); | |
33 | ||
9a8d2fdb MT |
34 | STATIC struct xlog * |
35 | xlog_alloc_log( | |
36 | struct xfs_mount *mp, | |
37 | struct xfs_buftarg *log_target, | |
38 | xfs_daddr_t blk_offset, | |
39 | int num_bblks); | |
ad223e60 MT |
40 | STATIC int |
41 | xlog_space_left( | |
42 | struct xlog *log, | |
43 | atomic64_t *head); | |
9a8d2fdb MT |
44 | STATIC void |
45 | xlog_dealloc_log( | |
46 | struct xlog *log); | |
1da177e4 LT |
47 | |
48 | /* local state machine functions */ | |
d15cbf2f CH |
49 | STATIC void xlog_state_done_syncing( |
50 | struct xlog_in_core *iclog, | |
51 | bool aborted); | |
9a8d2fdb MT |
52 | STATIC int |
53 | xlog_state_get_iclog_space( | |
54 | struct xlog *log, | |
55 | int len, | |
56 | struct xlog_in_core **iclog, | |
57 | struct xlog_ticket *ticket, | |
58 | int *continued_write, | |
59 | int *logoffsetp); | |
9a8d2fdb MT |
60 | STATIC void |
61 | xlog_state_switch_iclogs( | |
62 | struct xlog *log, | |
63 | struct xlog_in_core *iclog, | |
64 | int eventual_size); | |
65 | STATIC void | |
66 | xlog_state_want_sync( | |
67 | struct xlog *log, | |
68 | struct xlog_in_core *iclog); | |
1da177e4 | 69 | |
ad223e60 MT |
70 | STATIC void |
71 | xlog_grant_push_ail( | |
9a8d2fdb MT |
72 | struct xlog *log, |
73 | int need_bytes); | |
74 | STATIC void | |
75 | xlog_regrant_reserve_log_space( | |
76 | struct xlog *log, | |
77 | struct xlog_ticket *ticket); | |
78 | STATIC void | |
79 | xlog_ungrant_log_space( | |
80 | struct xlog *log, | |
81 | struct xlog_ticket *ticket); | |
df732b29 CH |
82 | STATIC void |
83 | xlog_sync( | |
84 | struct xlog *log, | |
85 | struct xlog_in_core *iclog); | |
cfcbbbd0 | 86 | #if defined(DEBUG) |
9a8d2fdb MT |
87 | STATIC void |
88 | xlog_verify_dest_ptr( | |
89 | struct xlog *log, | |
5809d5e0 | 90 | void *ptr); |
ad223e60 MT |
91 | STATIC void |
92 | xlog_verify_grant_tail( | |
9a8d2fdb MT |
93 | struct xlog *log); |
94 | STATIC void | |
95 | xlog_verify_iclog( | |
96 | struct xlog *log, | |
97 | struct xlog_in_core *iclog, | |
abca1f33 | 98 | int count); |
9a8d2fdb MT |
99 | STATIC void |
100 | xlog_verify_tail_lsn( | |
101 | struct xlog *log, | |
102 | struct xlog_in_core *iclog, | |
103 | xfs_lsn_t tail_lsn); | |
1da177e4 LT |
104 | #else |
105 | #define xlog_verify_dest_ptr(a,b) | |
3f336c6f | 106 | #define xlog_verify_grant_tail(a) |
abca1f33 | 107 | #define xlog_verify_iclog(a,b,c) |
1da177e4 LT |
108 | #define xlog_verify_tail_lsn(a,b,c) |
109 | #endif | |
110 | ||
9a8d2fdb MT |
111 | STATIC int |
112 | xlog_iclogs_empty( | |
113 | struct xlog *log); | |
1da177e4 | 114 | |
dd954c69 | 115 | static void |
663e496a | 116 | xlog_grant_sub_space( |
ad223e60 MT |
117 | struct xlog *log, |
118 | atomic64_t *head, | |
119 | int bytes) | |
dd954c69 | 120 | { |
d0eb2f38 DC |
121 | int64_t head_val = atomic64_read(head); |
122 | int64_t new, old; | |
a69ed03c | 123 | |
d0eb2f38 DC |
124 | do { |
125 | int cycle, space; | |
a69ed03c | 126 | |
d0eb2f38 | 127 | xlog_crack_grant_head_val(head_val, &cycle, &space); |
a69ed03c | 128 | |
d0eb2f38 DC |
129 | space -= bytes; |
130 | if (space < 0) { | |
131 | space += log->l_logsize; | |
132 | cycle--; | |
133 | } | |
134 | ||
135 | old = head_val; | |
136 | new = xlog_assign_grant_head_val(cycle, space); | |
137 | head_val = atomic64_cmpxchg(head, old, new); | |
138 | } while (head_val != old); | |
dd954c69 CH |
139 | } |
140 | ||
141 | static void | |
663e496a | 142 | xlog_grant_add_space( |
ad223e60 MT |
143 | struct xlog *log, |
144 | atomic64_t *head, | |
145 | int bytes) | |
dd954c69 | 146 | { |
d0eb2f38 DC |
147 | int64_t head_val = atomic64_read(head); |
148 | int64_t new, old; | |
a69ed03c | 149 | |
d0eb2f38 DC |
150 | do { |
151 | int tmp; | |
152 | int cycle, space; | |
a69ed03c | 153 | |
d0eb2f38 | 154 | xlog_crack_grant_head_val(head_val, &cycle, &space); |
a69ed03c | 155 | |
d0eb2f38 DC |
156 | tmp = log->l_logsize - space; |
157 | if (tmp > bytes) | |
158 | space += bytes; | |
159 | else { | |
160 | space = bytes - tmp; | |
161 | cycle++; | |
162 | } | |
163 | ||
164 | old = head_val; | |
165 | new = xlog_assign_grant_head_val(cycle, space); | |
166 | head_val = atomic64_cmpxchg(head, old, new); | |
167 | } while (head_val != old); | |
dd954c69 | 168 | } |
a69ed03c | 169 | |
c303c5b8 CH |
170 | STATIC void |
171 | xlog_grant_head_init( | |
172 | struct xlog_grant_head *head) | |
173 | { | |
174 | xlog_assign_grant_head(&head->grant, 1, 0); | |
175 | INIT_LIST_HEAD(&head->waiters); | |
176 | spin_lock_init(&head->lock); | |
177 | } | |
178 | ||
a79bf2d7 CH |
179 | STATIC void |
180 | xlog_grant_head_wake_all( | |
181 | struct xlog_grant_head *head) | |
182 | { | |
183 | struct xlog_ticket *tic; | |
184 | ||
185 | spin_lock(&head->lock); | |
186 | list_for_each_entry(tic, &head->waiters, t_queue) | |
187 | wake_up_process(tic->t_task); | |
188 | spin_unlock(&head->lock); | |
189 | } | |
190 | ||
e179840d CH |
191 | static inline int |
192 | xlog_ticket_reservation( | |
ad223e60 | 193 | struct xlog *log, |
e179840d CH |
194 | struct xlog_grant_head *head, |
195 | struct xlog_ticket *tic) | |
9f9c19ec | 196 | { |
e179840d CH |
197 | if (head == &log->l_write_head) { |
198 | ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); | |
199 | return tic->t_unit_res; | |
200 | } else { | |
9f9c19ec | 201 | if (tic->t_flags & XLOG_TIC_PERM_RESERV) |
e179840d | 202 | return tic->t_unit_res * tic->t_cnt; |
9f9c19ec | 203 | else |
e179840d | 204 | return tic->t_unit_res; |
9f9c19ec | 205 | } |
9f9c19ec CH |
206 | } |
207 | ||
208 | STATIC bool | |
e179840d | 209 | xlog_grant_head_wake( |
ad223e60 | 210 | struct xlog *log, |
e179840d | 211 | struct xlog_grant_head *head, |
9f9c19ec CH |
212 | int *free_bytes) |
213 | { | |
214 | struct xlog_ticket *tic; | |
215 | int need_bytes; | |
7c107afb | 216 | bool woken_task = false; |
9f9c19ec | 217 | |
e179840d | 218 | list_for_each_entry(tic, &head->waiters, t_queue) { |
7c107afb DC |
219 | |
220 | /* | |
221 | * There is a chance that the size of the CIL checkpoints in | |
222 | * progress at the last AIL push target calculation resulted in | |
223 | * limiting the target to the log head (l_last_sync_lsn) at the | |
224 | * time. This may not reflect where the log head is now as the | |
225 | * CIL checkpoints may have completed. | |
226 | * | |
227 | * Hence when we are woken here, it may be that the head of the | |
228 | * log that has moved rather than the tail. As the tail didn't | |
229 | * move, there still won't be space available for the | |
230 | * reservation we require. However, if the AIL has already | |
231 | * pushed to the target defined by the old log head location, we | |
232 | * will hang here waiting for something else to update the AIL | |
233 | * push target. | |
234 | * | |
235 | * Therefore, if there isn't space to wake the first waiter on | |
236 | * the grant head, we need to push the AIL again to ensure the | |
237 | * target reflects both the current log tail and log head | |
238 | * position before we wait for the tail to move again. | |
239 | */ | |
240 | ||
e179840d | 241 | need_bytes = xlog_ticket_reservation(log, head, tic); |
7c107afb DC |
242 | if (*free_bytes < need_bytes) { |
243 | if (!woken_task) | |
244 | xlog_grant_push_ail(log, need_bytes); | |
9f9c19ec | 245 | return false; |
7c107afb | 246 | } |
9f9c19ec | 247 | |
e179840d CH |
248 | *free_bytes -= need_bytes; |
249 | trace_xfs_log_grant_wake_up(log, tic); | |
14a7235f | 250 | wake_up_process(tic->t_task); |
7c107afb | 251 | woken_task = true; |
9f9c19ec CH |
252 | } |
253 | ||
254 | return true; | |
255 | } | |
256 | ||
257 | STATIC int | |
23ee3df3 | 258 | xlog_grant_head_wait( |
ad223e60 | 259 | struct xlog *log, |
23ee3df3 | 260 | struct xlog_grant_head *head, |
9f9c19ec | 261 | struct xlog_ticket *tic, |
a30b0367 DC |
262 | int need_bytes) __releases(&head->lock) |
263 | __acquires(&head->lock) | |
9f9c19ec | 264 | { |
23ee3df3 | 265 | list_add_tail(&tic->t_queue, &head->waiters); |
9f9c19ec CH |
266 | |
267 | do { | |
268 | if (XLOG_FORCED_SHUTDOWN(log)) | |
269 | goto shutdown; | |
270 | xlog_grant_push_ail(log, need_bytes); | |
271 | ||
14a7235f | 272 | __set_current_state(TASK_UNINTERRUPTIBLE); |
23ee3df3 | 273 | spin_unlock(&head->lock); |
14a7235f | 274 | |
ff6d6af2 | 275 | XFS_STATS_INC(log->l_mp, xs_sleep_logspace); |
9f9c19ec | 276 | |
14a7235f CH |
277 | trace_xfs_log_grant_sleep(log, tic); |
278 | schedule(); | |
9f9c19ec CH |
279 | trace_xfs_log_grant_wake(log, tic); |
280 | ||
23ee3df3 | 281 | spin_lock(&head->lock); |
9f9c19ec CH |
282 | if (XLOG_FORCED_SHUTDOWN(log)) |
283 | goto shutdown; | |
23ee3df3 | 284 | } while (xlog_space_left(log, &head->grant) < need_bytes); |
9f9c19ec CH |
285 | |
286 | list_del_init(&tic->t_queue); | |
287 | return 0; | |
288 | shutdown: | |
289 | list_del_init(&tic->t_queue); | |
2451337d | 290 | return -EIO; |
9f9c19ec CH |
291 | } |
292 | ||
42ceedb3 CH |
293 | /* |
294 | * Atomically get the log space required for a log ticket. | |
295 | * | |
296 | * Once a ticket gets put onto head->waiters, it will only return after the | |
297 | * needed reservation is satisfied. | |
298 | * | |
299 | * This function is structured so that it has a lock free fast path. This is | |
300 | * necessary because every new transaction reservation will come through this | |
301 | * path. Hence any lock will be globally hot if we take it unconditionally on | |
302 | * every pass. | |
303 | * | |
304 | * As tickets are only ever moved on and off head->waiters under head->lock, we | |
305 | * only need to take that lock if we are going to add the ticket to the queue | |
306 | * and sleep. We can avoid taking the lock if the ticket was never added to | |
307 | * head->waiters because the t_queue list head will be empty and we hold the | |
308 | * only reference to it so it can safely be checked unlocked. | |
309 | */ | |
310 | STATIC int | |
311 | xlog_grant_head_check( | |
ad223e60 | 312 | struct xlog *log, |
42ceedb3 CH |
313 | struct xlog_grant_head *head, |
314 | struct xlog_ticket *tic, | |
315 | int *need_bytes) | |
316 | { | |
317 | int free_bytes; | |
318 | int error = 0; | |
319 | ||
320 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); | |
321 | ||
322 | /* | |
323 | * If there are other waiters on the queue then give them a chance at | |
324 | * logspace before us. Wake up the first waiters, if we do not wake | |
325 | * up all the waiters then go to sleep waiting for more free space, | |
326 | * otherwise try to get some space for this transaction. | |
327 | */ | |
328 | *need_bytes = xlog_ticket_reservation(log, head, tic); | |
329 | free_bytes = xlog_space_left(log, &head->grant); | |
330 | if (!list_empty_careful(&head->waiters)) { | |
331 | spin_lock(&head->lock); | |
332 | if (!xlog_grant_head_wake(log, head, &free_bytes) || | |
333 | free_bytes < *need_bytes) { | |
334 | error = xlog_grant_head_wait(log, head, tic, | |
335 | *need_bytes); | |
336 | } | |
337 | spin_unlock(&head->lock); | |
338 | } else if (free_bytes < *need_bytes) { | |
339 | spin_lock(&head->lock); | |
340 | error = xlog_grant_head_wait(log, head, tic, *need_bytes); | |
341 | spin_unlock(&head->lock); | |
342 | } | |
343 | ||
344 | return error; | |
345 | } | |
346 | ||
0adba536 CH |
347 | static void |
348 | xlog_tic_reset_res(xlog_ticket_t *tic) | |
349 | { | |
350 | tic->t_res_num = 0; | |
351 | tic->t_res_arr_sum = 0; | |
352 | tic->t_res_num_ophdrs = 0; | |
353 | } | |
354 | ||
355 | static void | |
356 | xlog_tic_add_region(xlog_ticket_t *tic, uint len, uint type) | |
357 | { | |
358 | if (tic->t_res_num == XLOG_TIC_LEN_MAX) { | |
359 | /* add to overflow and start again */ | |
360 | tic->t_res_o_flow += tic->t_res_arr_sum; | |
361 | tic->t_res_num = 0; | |
362 | tic->t_res_arr_sum = 0; | |
363 | } | |
364 | ||
365 | tic->t_res_arr[tic->t_res_num].r_len = len; | |
366 | tic->t_res_arr[tic->t_res_num].r_type = type; | |
367 | tic->t_res_arr_sum += len; | |
368 | tic->t_res_num++; | |
369 | } | |
dd954c69 | 370 | |
9006fb91 CH |
371 | /* |
372 | * Replenish the byte reservation required by moving the grant write head. | |
373 | */ | |
374 | int | |
375 | xfs_log_regrant( | |
376 | struct xfs_mount *mp, | |
377 | struct xlog_ticket *tic) | |
378 | { | |
ad223e60 | 379 | struct xlog *log = mp->m_log; |
9006fb91 CH |
380 | int need_bytes; |
381 | int error = 0; | |
382 | ||
383 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2451337d | 384 | return -EIO; |
9006fb91 | 385 | |
ff6d6af2 | 386 | XFS_STATS_INC(mp, xs_try_logspace); |
9006fb91 CH |
387 | |
388 | /* | |
389 | * This is a new transaction on the ticket, so we need to change the | |
390 | * transaction ID so that the next transaction has a different TID in | |
391 | * the log. Just add one to the existing tid so that we can see chains | |
392 | * of rolling transactions in the log easily. | |
393 | */ | |
394 | tic->t_tid++; | |
395 | ||
396 | xlog_grant_push_ail(log, tic->t_unit_res); | |
397 | ||
398 | tic->t_curr_res = tic->t_unit_res; | |
399 | xlog_tic_reset_res(tic); | |
400 | ||
401 | if (tic->t_cnt > 0) | |
402 | return 0; | |
403 | ||
404 | trace_xfs_log_regrant(log, tic); | |
405 | ||
406 | error = xlog_grant_head_check(log, &log->l_write_head, tic, | |
407 | &need_bytes); | |
408 | if (error) | |
409 | goto out_error; | |
410 | ||
411 | xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes); | |
412 | trace_xfs_log_regrant_exit(log, tic); | |
413 | xlog_verify_grant_tail(log); | |
414 | return 0; | |
415 | ||
416 | out_error: | |
417 | /* | |
418 | * If we are failing, make sure the ticket doesn't have any current | |
419 | * reservations. We don't want to add this back when the ticket/ | |
420 | * transaction gets cancelled. | |
421 | */ | |
422 | tic->t_curr_res = 0; | |
423 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
424 | return error; | |
425 | } | |
426 | ||
427 | /* | |
a0e336ba | 428 | * Reserve log space and return a ticket corresponding to the reservation. |
9006fb91 CH |
429 | * |
430 | * Each reservation is going to reserve extra space for a log record header. | |
431 | * When writes happen to the on-disk log, we don't subtract the length of the | |
432 | * log record header from any reservation. By wasting space in each | |
433 | * reservation, we prevent over allocation problems. | |
434 | */ | |
435 | int | |
436 | xfs_log_reserve( | |
437 | struct xfs_mount *mp, | |
438 | int unit_bytes, | |
439 | int cnt, | |
440 | struct xlog_ticket **ticp, | |
c8ce540d | 441 | uint8_t client, |
710b1e2c | 442 | bool permanent) |
9006fb91 | 443 | { |
ad223e60 | 444 | struct xlog *log = mp->m_log; |
9006fb91 CH |
445 | struct xlog_ticket *tic; |
446 | int need_bytes; | |
447 | int error = 0; | |
448 | ||
449 | ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); | |
450 | ||
451 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2451337d | 452 | return -EIO; |
9006fb91 | 453 | |
ff6d6af2 | 454 | XFS_STATS_INC(mp, xs_try_logspace); |
9006fb91 CH |
455 | |
456 | ASSERT(*ticp == NULL); | |
707e0dda | 457 | tic = xlog_ticket_alloc(log, unit_bytes, cnt, client, permanent, 0); |
9006fb91 CH |
458 | *ticp = tic; |
459 | ||
437a255a DC |
460 | xlog_grant_push_ail(log, tic->t_cnt ? tic->t_unit_res * tic->t_cnt |
461 | : tic->t_unit_res); | |
9006fb91 CH |
462 | |
463 | trace_xfs_log_reserve(log, tic); | |
464 | ||
465 | error = xlog_grant_head_check(log, &log->l_reserve_head, tic, | |
466 | &need_bytes); | |
467 | if (error) | |
468 | goto out_error; | |
469 | ||
470 | xlog_grant_add_space(log, &log->l_reserve_head.grant, need_bytes); | |
471 | xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes); | |
472 | trace_xfs_log_reserve_exit(log, tic); | |
473 | xlog_verify_grant_tail(log); | |
474 | return 0; | |
475 | ||
476 | out_error: | |
477 | /* | |
478 | * If we are failing, make sure the ticket doesn't have any current | |
479 | * reservations. We don't want to add this back when the ticket/ | |
480 | * transaction gets cancelled. | |
481 | */ | |
482 | tic->t_curr_res = 0; | |
483 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
484 | return error; | |
485 | } | |
486 | ||
487 | ||
1da177e4 LT |
488 | /* |
489 | * NOTES: | |
490 | * | |
491 | * 1. currblock field gets updated at startup and after in-core logs | |
492 | * marked as with WANT_SYNC. | |
493 | */ | |
494 | ||
495 | /* | |
496 | * This routine is called when a user of a log manager ticket is done with | |
497 | * the reservation. If the ticket was ever used, then a commit record for | |
498 | * the associated transaction is written out as a log operation header with | |
499 | * no data. The flag XLOG_TIC_INITED is set when the first write occurs with | |
500 | * a given ticket. If the ticket was one with a permanent reservation, then | |
501 | * a few operations are done differently. Permanent reservation tickets by | |
502 | * default don't release the reservation. They just commit the current | |
503 | * transaction with the belief that the reservation is still needed. A flag | |
504 | * must be passed in before permanent reservations are actually released. | |
505 | * When these type of tickets are not released, they need to be set into | |
506 | * the inited state again. By doing this, a start record will be written | |
507 | * out when the next write occurs. | |
508 | */ | |
509 | xfs_lsn_t | |
35a8a72f CH |
510 | xfs_log_done( |
511 | struct xfs_mount *mp, | |
512 | struct xlog_ticket *ticket, | |
513 | struct xlog_in_core **iclog, | |
f78c3901 | 514 | bool regrant) |
1da177e4 | 515 | { |
ad223e60 | 516 | struct xlog *log = mp->m_log; |
35a8a72f | 517 | xfs_lsn_t lsn = 0; |
1da177e4 | 518 | |
1da177e4 LT |
519 | if (XLOG_FORCED_SHUTDOWN(log) || |
520 | /* | |
521 | * If nothing was ever written, don't write out commit record. | |
522 | * If we get an error, just continue and give back the log ticket. | |
523 | */ | |
524 | (((ticket->t_flags & XLOG_TIC_INITED) == 0) && | |
55b66332 | 525 | (xlog_commit_record(log, ticket, iclog, &lsn)))) { |
1da177e4 | 526 | lsn = (xfs_lsn_t) -1; |
f78c3901 | 527 | regrant = false; |
1da177e4 LT |
528 | } |
529 | ||
530 | ||
f78c3901 | 531 | if (!regrant) { |
0b1b213f CH |
532 | trace_xfs_log_done_nonperm(log, ticket); |
533 | ||
1da177e4 | 534 | /* |
c41564b5 | 535 | * Release ticket if not permanent reservation or a specific |
1da177e4 LT |
536 | * request has been made to release a permanent reservation. |
537 | */ | |
538 | xlog_ungrant_log_space(log, ticket); | |
1da177e4 | 539 | } else { |
0b1b213f CH |
540 | trace_xfs_log_done_perm(log, ticket); |
541 | ||
1da177e4 | 542 | xlog_regrant_reserve_log_space(log, ticket); |
c6a7b0f8 LM |
543 | /* If this ticket was a permanent reservation and we aren't |
544 | * trying to release it, reset the inited flags; so next time | |
545 | * we write, a start record will be written out. | |
546 | */ | |
1da177e4 | 547 | ticket->t_flags |= XLOG_TIC_INITED; |
c6a7b0f8 | 548 | } |
1da177e4 | 549 | |
f78c3901 | 550 | xfs_log_ticket_put(ticket); |
1da177e4 | 551 | return lsn; |
35a8a72f | 552 | } |
1da177e4 | 553 | |
df732b29 CH |
554 | static bool |
555 | __xlog_state_release_iclog( | |
556 | struct xlog *log, | |
557 | struct xlog_in_core *iclog) | |
558 | { | |
559 | lockdep_assert_held(&log->l_icloglock); | |
560 | ||
561 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC) { | |
562 | /* update tail before writing to iclog */ | |
563 | xfs_lsn_t tail_lsn = xlog_assign_tail_lsn(log->l_mp); | |
564 | ||
565 | iclog->ic_state = XLOG_STATE_SYNCING; | |
566 | iclog->ic_header.h_tail_lsn = cpu_to_be64(tail_lsn); | |
567 | xlog_verify_tail_lsn(log, iclog, tail_lsn); | |
568 | /* cycle incremented when incrementing curr_block */ | |
569 | return true; | |
570 | } | |
571 | ||
572 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); | |
573 | return false; | |
574 | } | |
575 | ||
576 | /* | |
577 | * Flush iclog to disk if this is the last reference to the given iclog and the | |
578 | * it is in the WANT_SYNC state. | |
579 | */ | |
580 | static int | |
581 | xlog_state_release_iclog( | |
582 | struct xlog *log, | |
583 | struct xlog_in_core *iclog) | |
584 | { | |
585 | lockdep_assert_held(&log->l_icloglock); | |
586 | ||
1858bb0b | 587 | if (iclog->ic_state == XLOG_STATE_IOERROR) |
df732b29 CH |
588 | return -EIO; |
589 | ||
590 | if (atomic_dec_and_test(&iclog->ic_refcnt) && | |
591 | __xlog_state_release_iclog(log, iclog)) { | |
592 | spin_unlock(&log->l_icloglock); | |
593 | xlog_sync(log, iclog); | |
594 | spin_lock(&log->l_icloglock); | |
595 | } | |
596 | ||
597 | return 0; | |
598 | } | |
599 | ||
1da177e4 | 600 | int |
35a8a72f | 601 | xfs_log_release_iclog( |
df732b29 | 602 | struct xfs_mount *mp, |
35a8a72f | 603 | struct xlog_in_core *iclog) |
1da177e4 | 604 | { |
df732b29 CH |
605 | struct xlog *log = mp->m_log; |
606 | bool sync; | |
607 | ||
6b789c33 BF |
608 | if (iclog->ic_state == XLOG_STATE_IOERROR) |
609 | goto error; | |
1da177e4 | 610 | |
df732b29 | 611 | if (atomic_dec_and_lock(&iclog->ic_refcnt, &log->l_icloglock)) { |
6b789c33 BF |
612 | if (iclog->ic_state == XLOG_STATE_IOERROR) { |
613 | spin_unlock(&log->l_icloglock); | |
614 | goto error; | |
615 | } | |
df732b29 CH |
616 | sync = __xlog_state_release_iclog(log, iclog); |
617 | spin_unlock(&log->l_icloglock); | |
618 | if (sync) | |
619 | xlog_sync(log, iclog); | |
620 | } | |
1da177e4 | 621 | return 0; |
6b789c33 BF |
622 | error: |
623 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); | |
624 | return -EIO; | |
1da177e4 LT |
625 | } |
626 | ||
1da177e4 LT |
627 | /* |
628 | * Mount a log filesystem | |
629 | * | |
630 | * mp - ubiquitous xfs mount point structure | |
631 | * log_target - buftarg of on-disk log device | |
632 | * blk_offset - Start block # where block size is 512 bytes (BBSIZE) | |
633 | * num_bblocks - Number of BBSIZE blocks in on-disk log | |
634 | * | |
635 | * Return error or zero. | |
636 | */ | |
637 | int | |
249a8c11 DC |
638 | xfs_log_mount( |
639 | xfs_mount_t *mp, | |
640 | xfs_buftarg_t *log_target, | |
641 | xfs_daddr_t blk_offset, | |
642 | int num_bblks) | |
1da177e4 | 643 | { |
9c92ee20 | 644 | bool fatal = xfs_sb_version_hascrc(&mp->m_sb); |
3e7b91cf JL |
645 | int error = 0; |
646 | int min_logfsbs; | |
249a8c11 | 647 | |
c99d609a DC |
648 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { |
649 | xfs_notice(mp, "Mounting V%d Filesystem", | |
650 | XFS_SB_VERSION_NUM(&mp->m_sb)); | |
651 | } else { | |
a0fa2b67 | 652 | xfs_notice(mp, |
c99d609a DC |
653 | "Mounting V%d filesystem in no-recovery mode. Filesystem will be inconsistent.", |
654 | XFS_SB_VERSION_NUM(&mp->m_sb)); | |
bd186aa9 | 655 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
656 | } |
657 | ||
658 | mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); | |
a6cb767e | 659 | if (IS_ERR(mp->m_log)) { |
2451337d | 660 | error = PTR_ERR(mp->m_log); |
644c3567 DC |
661 | goto out; |
662 | } | |
1da177e4 | 663 | |
3e7b91cf JL |
664 | /* |
665 | * Validate the given log space and drop a critical message via syslog | |
666 | * if the log size is too small that would lead to some unexpected | |
667 | * situations in transaction log space reservation stage. | |
668 | * | |
669 | * Note: we can't just reject the mount if the validation fails. This | |
670 | * would mean that people would have to downgrade their kernel just to | |
671 | * remedy the situation as there is no way to grow the log (short of | |
672 | * black magic surgery with xfs_db). | |
673 | * | |
674 | * We can, however, reject mounts for CRC format filesystems, as the | |
675 | * mkfs binary being used to make the filesystem should never create a | |
676 | * filesystem with a log that is too small. | |
677 | */ | |
678 | min_logfsbs = xfs_log_calc_minimum_size(mp); | |
679 | ||
680 | if (mp->m_sb.sb_logblocks < min_logfsbs) { | |
681 | xfs_warn(mp, | |
682 | "Log size %d blocks too small, minimum size is %d blocks", | |
683 | mp->m_sb.sb_logblocks, min_logfsbs); | |
2451337d | 684 | error = -EINVAL; |
3e7b91cf JL |
685 | } else if (mp->m_sb.sb_logblocks > XFS_MAX_LOG_BLOCKS) { |
686 | xfs_warn(mp, | |
687 | "Log size %d blocks too large, maximum size is %lld blocks", | |
688 | mp->m_sb.sb_logblocks, XFS_MAX_LOG_BLOCKS); | |
2451337d | 689 | error = -EINVAL; |
3e7b91cf JL |
690 | } else if (XFS_FSB_TO_B(mp, mp->m_sb.sb_logblocks) > XFS_MAX_LOG_BYTES) { |
691 | xfs_warn(mp, | |
692 | "log size %lld bytes too large, maximum size is %lld bytes", | |
693 | XFS_FSB_TO_B(mp, mp->m_sb.sb_logblocks), | |
694 | XFS_MAX_LOG_BYTES); | |
2451337d | 695 | error = -EINVAL; |
9c92ee20 DW |
696 | } else if (mp->m_sb.sb_logsunit > 1 && |
697 | mp->m_sb.sb_logsunit % mp->m_sb.sb_blocksize) { | |
698 | xfs_warn(mp, | |
699 | "log stripe unit %u bytes must be a multiple of block size", | |
700 | mp->m_sb.sb_logsunit); | |
701 | error = -EINVAL; | |
702 | fatal = true; | |
3e7b91cf JL |
703 | } |
704 | if (error) { | |
9c92ee20 DW |
705 | /* |
706 | * Log check errors are always fatal on v5; or whenever bad | |
707 | * metadata leads to a crash. | |
708 | */ | |
709 | if (fatal) { | |
3e7b91cf JL |
710 | xfs_crit(mp, "AAIEEE! Log failed size checks. Abort!"); |
711 | ASSERT(0); | |
712 | goto out_free_log; | |
713 | } | |
f41febd2 | 714 | xfs_crit(mp, "Log size out of supported range."); |
3e7b91cf | 715 | xfs_crit(mp, |
f41febd2 | 716 | "Continuing onwards, but if log hangs are experienced then please report this message in the bug report."); |
3e7b91cf JL |
717 | } |
718 | ||
249a8c11 DC |
719 | /* |
720 | * Initialize the AIL now we have a log. | |
721 | */ | |
249a8c11 DC |
722 | error = xfs_trans_ail_init(mp); |
723 | if (error) { | |
a0fa2b67 | 724 | xfs_warn(mp, "AIL initialisation failed: error %d", error); |
26430752 | 725 | goto out_free_log; |
249a8c11 | 726 | } |
a9c21c1b | 727 | mp->m_log->l_ailp = mp->m_ail; |
249a8c11 | 728 | |
1da177e4 LT |
729 | /* |
730 | * skip log recovery on a norecovery mount. pretend it all | |
731 | * just worked. | |
732 | */ | |
733 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { | |
249a8c11 | 734 | int readonly = (mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
735 | |
736 | if (readonly) | |
bd186aa9 | 737 | mp->m_flags &= ~XFS_MOUNT_RDONLY; |
1da177e4 | 738 | |
65be6054 | 739 | error = xlog_recover(mp->m_log); |
1da177e4 LT |
740 | |
741 | if (readonly) | |
bd186aa9 | 742 | mp->m_flags |= XFS_MOUNT_RDONLY; |
1da177e4 | 743 | if (error) { |
a0fa2b67 DC |
744 | xfs_warn(mp, "log mount/recovery failed: error %d", |
745 | error); | |
f0b2efad | 746 | xlog_recover_cancel(mp->m_log); |
26430752 | 747 | goto out_destroy_ail; |
1da177e4 LT |
748 | } |
749 | } | |
750 | ||
baff4e44 BF |
751 | error = xfs_sysfs_init(&mp->m_log->l_kobj, &xfs_log_ktype, &mp->m_kobj, |
752 | "log"); | |
753 | if (error) | |
754 | goto out_destroy_ail; | |
755 | ||
1da177e4 LT |
756 | /* Normal transactions can now occur */ |
757 | mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; | |
758 | ||
71e330b5 DC |
759 | /* |
760 | * Now the log has been fully initialised and we know were our | |
761 | * space grant counters are, we can initialise the permanent ticket | |
762 | * needed for delayed logging to work. | |
763 | */ | |
764 | xlog_cil_init_post_recovery(mp->m_log); | |
765 | ||
1da177e4 | 766 | return 0; |
26430752 CH |
767 | |
768 | out_destroy_ail: | |
769 | xfs_trans_ail_destroy(mp); | |
770 | out_free_log: | |
771 | xlog_dealloc_log(mp->m_log); | |
644c3567 | 772 | out: |
249a8c11 | 773 | return error; |
26430752 | 774 | } |
1da177e4 LT |
775 | |
776 | /* | |
f661f1e0 DC |
777 | * Finish the recovery of the file system. This is separate from the |
778 | * xfs_log_mount() call, because it depends on the code in xfs_mountfs() to read | |
779 | * in the root and real-time bitmap inodes between calling xfs_log_mount() and | |
780 | * here. | |
1da177e4 | 781 | * |
f661f1e0 DC |
782 | * If we finish recovery successfully, start the background log work. If we are |
783 | * not doing recovery, then we have a RO filesystem and we don't need to start | |
784 | * it. | |
1da177e4 LT |
785 | */ |
786 | int | |
f0b2efad BF |
787 | xfs_log_mount_finish( |
788 | struct xfs_mount *mp) | |
1da177e4 | 789 | { |
f661f1e0 | 790 | int error = 0; |
6f4a1eef | 791 | bool readonly = (mp->m_flags & XFS_MOUNT_RDONLY); |
f1b92bbc | 792 | bool recovered = mp->m_log->l_flags & XLOG_RECOVERY_NEEDED; |
1da177e4 | 793 | |
f0b2efad | 794 | if (mp->m_flags & XFS_MOUNT_NORECOVERY) { |
bd186aa9 | 795 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
f0b2efad | 796 | return 0; |
6f4a1eef ES |
797 | } else if (readonly) { |
798 | /* Allow unlinked processing to proceed */ | |
799 | mp->m_flags &= ~XFS_MOUNT_RDONLY; | |
1da177e4 LT |
800 | } |
801 | ||
8204f8dd DW |
802 | /* |
803 | * During the second phase of log recovery, we need iget and | |
804 | * iput to behave like they do for an active filesystem. | |
805 | * xfs_fs_drop_inode needs to be able to prevent the deletion | |
806 | * of inodes before we're done replaying log items on those | |
807 | * inodes. Turn it off immediately after recovery finishes | |
808 | * so that we don't leak the quota inodes if subsequent mount | |
809 | * activities fail. | |
799ea9e9 DW |
810 | * |
811 | * We let all inodes involved in redo item processing end up on | |
812 | * the LRU instead of being evicted immediately so that if we do | |
813 | * something to an unlinked inode, the irele won't cause | |
814 | * premature truncation and freeing of the inode, which results | |
815 | * in log recovery failure. We have to evict the unreferenced | |
1751e8a6 | 816 | * lru inodes after clearing SB_ACTIVE because we don't |
799ea9e9 DW |
817 | * otherwise clean up the lru if there's a subsequent failure in |
818 | * xfs_mountfs, which leads to us leaking the inodes if nothing | |
819 | * else (e.g. quotacheck) references the inodes before the | |
820 | * mount failure occurs. | |
8204f8dd | 821 | */ |
1751e8a6 | 822 | mp->m_super->s_flags |= SB_ACTIVE; |
f0b2efad BF |
823 | error = xlog_recover_finish(mp->m_log); |
824 | if (!error) | |
825 | xfs_log_work_queue(mp); | |
1751e8a6 | 826 | mp->m_super->s_flags &= ~SB_ACTIVE; |
799ea9e9 | 827 | evict_inodes(mp->m_super); |
f0b2efad | 828 | |
f1b92bbc BF |
829 | /* |
830 | * Drain the buffer LRU after log recovery. This is required for v4 | |
831 | * filesystems to avoid leaving around buffers with NULL verifier ops, | |
832 | * but we do it unconditionally to make sure we're always in a clean | |
833 | * cache state after mount. | |
834 | * | |
835 | * Don't push in the error case because the AIL may have pending intents | |
836 | * that aren't removed until recovery is cancelled. | |
837 | */ | |
838 | if (!error && recovered) { | |
839 | xfs_log_force(mp, XFS_LOG_SYNC); | |
840 | xfs_ail_push_all_sync(mp->m_ail); | |
841 | } | |
842 | xfs_wait_buftarg(mp->m_ddev_targp); | |
843 | ||
6f4a1eef ES |
844 | if (readonly) |
845 | mp->m_flags |= XFS_MOUNT_RDONLY; | |
846 | ||
f0b2efad BF |
847 | return error; |
848 | } | |
849 | ||
850 | /* | |
851 | * The mount has failed. Cancel the recovery if it hasn't completed and destroy | |
852 | * the log. | |
853 | */ | |
a7a9250e | 854 | void |
f0b2efad BF |
855 | xfs_log_mount_cancel( |
856 | struct xfs_mount *mp) | |
857 | { | |
a7a9250e | 858 | xlog_recover_cancel(mp->m_log); |
f0b2efad | 859 | xfs_log_unmount(mp); |
1da177e4 LT |
860 | } |
861 | ||
1da177e4 LT |
862 | /* |
863 | * Final log writes as part of unmount. | |
864 | * | |
865 | * Mark the filesystem clean as unmount happens. Note that during relocation | |
866 | * this routine needs to be executed as part of source-bag while the | |
867 | * deallocation must not be done until source-end. | |
868 | */ | |
869 | ||
53235f22 DW |
870 | /* Actually write the unmount record to disk. */ |
871 | static void | |
872 | xfs_log_write_unmount_record( | |
873 | struct xfs_mount *mp) | |
874 | { | |
875 | /* the data section must be 32 bit size aligned */ | |
876 | struct xfs_unmount_log_format magic = { | |
877 | .magic = XLOG_UNMOUNT_TYPE, | |
878 | }; | |
879 | struct xfs_log_iovec reg = { | |
880 | .i_addr = &magic, | |
881 | .i_len = sizeof(magic), | |
882 | .i_type = XLOG_REG_TYPE_UNMOUNT, | |
883 | }; | |
884 | struct xfs_log_vec vec = { | |
885 | .lv_niovecs = 1, | |
886 | .lv_iovecp = ®, | |
887 | }; | |
888 | struct xlog *log = mp->m_log; | |
889 | struct xlog_in_core *iclog; | |
890 | struct xlog_ticket *tic = NULL; | |
891 | xfs_lsn_t lsn; | |
f467cad9 | 892 | uint flags = XLOG_UNMOUNT_TRANS; |
53235f22 DW |
893 | int error; |
894 | ||
895 | error = xfs_log_reserve(mp, 600, 1, &tic, XFS_LOG, 0); | |
896 | if (error) | |
897 | goto out_err; | |
898 | ||
f467cad9 DW |
899 | /* |
900 | * If we think the summary counters are bad, clear the unmount header | |
901 | * flag in the unmount record so that the summary counters will be | |
902 | * recalculated during log recovery at next mount. Refer to | |
903 | * xlog_check_unmount_rec for more details. | |
904 | */ | |
39353ff6 | 905 | if (XFS_TEST_ERROR(xfs_fs_has_sickness(mp, XFS_SICK_FS_COUNTERS), mp, |
f467cad9 DW |
906 | XFS_ERRTAG_FORCE_SUMMARY_RECALC)) { |
907 | xfs_alert(mp, "%s: will fix summary counters at next mount", | |
908 | __func__); | |
909 | flags &= ~XLOG_UNMOUNT_TRANS; | |
910 | } | |
911 | ||
53235f22 DW |
912 | /* remove inited flag, and account for space used */ |
913 | tic->t_flags = 0; | |
914 | tic->t_curr_res -= sizeof(magic); | |
f467cad9 | 915 | error = xlog_write(log, &vec, tic, &lsn, NULL, flags); |
53235f22 DW |
916 | /* |
917 | * At this point, we're umounting anyway, so there's no point in | |
918 | * transitioning log state to IOERROR. Just continue... | |
919 | */ | |
920 | out_err: | |
921 | if (error) | |
922 | xfs_alert(mp, "%s: unmount record failed", __func__); | |
923 | ||
924 | spin_lock(&log->l_icloglock); | |
925 | iclog = log->l_iclog; | |
926 | atomic_inc(&iclog->ic_refcnt); | |
927 | xlog_state_want_sync(log, iclog); | |
53235f22 | 928 | error = xlog_state_release_iclog(log, iclog); |
53235f22 DW |
929 | switch (iclog->ic_state) { |
930 | default: | |
931 | if (!XLOG_FORCED_SHUTDOWN(log)) { | |
932 | xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); | |
933 | break; | |
934 | } | |
935 | /* fall through */ | |
936 | case XLOG_STATE_ACTIVE: | |
937 | case XLOG_STATE_DIRTY: | |
938 | spin_unlock(&log->l_icloglock); | |
939 | break; | |
940 | } | |
941 | ||
942 | if (tic) { | |
943 | trace_xfs_log_umount_write(log, tic); | |
944 | xlog_ungrant_log_space(log, tic); | |
945 | xfs_log_ticket_put(tic); | |
946 | } | |
947 | } | |
948 | ||
1da177e4 LT |
949 | /* |
950 | * Unmount record used to have a string "Unmount filesystem--" in the | |
951 | * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE). | |
952 | * We just write the magic number now since that particular field isn't | |
8e159e72 | 953 | * currently architecture converted and "Unmount" is a bit foo. |
1da177e4 LT |
954 | * As far as I know, there weren't any dependencies on the old behaviour. |
955 | */ | |
956 | ||
0d5a75e9 | 957 | static int |
1da177e4 LT |
958 | xfs_log_unmount_write(xfs_mount_t *mp) |
959 | { | |
9a8d2fdb | 960 | struct xlog *log = mp->m_log; |
1da177e4 LT |
961 | xlog_in_core_t *iclog; |
962 | #ifdef DEBUG | |
963 | xlog_in_core_t *first_iclog; | |
964 | #endif | |
1da177e4 | 965 | int error; |
1da177e4 | 966 | |
1da177e4 | 967 | /* |
757a69ef | 968 | * Don't write out unmount record on norecovery mounts or ro devices. |
1da177e4 LT |
969 | * Or, if we are doing a forced umount (typically because of IO errors). |
970 | */ | |
757a69ef | 971 | if (mp->m_flags & XFS_MOUNT_NORECOVERY || |
2d15d2c0 | 972 | xfs_readonly_buftarg(log->l_targ)) { |
757a69ef | 973 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 | 974 | return 0; |
757a69ef | 975 | } |
1da177e4 | 976 | |
60e5bb78 | 977 | error = xfs_log_force(mp, XFS_LOG_SYNC); |
b911ca04 | 978 | ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log))); |
1da177e4 LT |
979 | |
980 | #ifdef DEBUG | |
981 | first_iclog = iclog = log->l_iclog; | |
982 | do { | |
1858bb0b CH |
983 | if (iclog->ic_state != XLOG_STATE_IOERROR) { |
984 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); | |
1da177e4 LT |
985 | ASSERT(iclog->ic_offset == 0); |
986 | } | |
987 | iclog = iclog->ic_next; | |
988 | } while (iclog != first_iclog); | |
989 | #endif | |
990 | if (! (XLOG_FORCED_SHUTDOWN(log))) { | |
53235f22 | 991 | xfs_log_write_unmount_record(mp); |
1da177e4 LT |
992 | } else { |
993 | /* | |
994 | * We're already in forced_shutdown mode, couldn't | |
995 | * even attempt to write out the unmount transaction. | |
996 | * | |
997 | * Go through the motions of sync'ing and releasing | |
998 | * the iclog, even though no I/O will actually happen, | |
c41564b5 | 999 | * we need to wait for other log I/Os that may already |
1da177e4 LT |
1000 | * be in progress. Do this as a separate section of |
1001 | * code so we'll know if we ever get stuck here that | |
1002 | * we're in this odd situation of trying to unmount | |
1003 | * a file system that went into forced_shutdown as | |
1004 | * the result of an unmount.. | |
1005 | */ | |
b22cd72c | 1006 | spin_lock(&log->l_icloglock); |
1da177e4 | 1007 | iclog = log->l_iclog; |
155cc6b7 | 1008 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 | 1009 | xlog_state_want_sync(log, iclog); |
1bb7d6b5 | 1010 | error = xlog_state_release_iclog(log, iclog); |
1858bb0b CH |
1011 | switch (iclog->ic_state) { |
1012 | case XLOG_STATE_ACTIVE: | |
1013 | case XLOG_STATE_DIRTY: | |
1014 | case XLOG_STATE_IOERROR: | |
b22cd72c | 1015 | spin_unlock(&log->l_icloglock); |
1858bb0b CH |
1016 | break; |
1017 | default: | |
1018 | xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); | |
1019 | break; | |
1da177e4 LT |
1020 | } |
1021 | } | |
1022 | ||
1bb7d6b5 | 1023 | return error; |
1da177e4 LT |
1024 | } /* xfs_log_unmount_write */ |
1025 | ||
1026 | /* | |
c75921a7 | 1027 | * Empty the log for unmount/freeze. |
cf2931db DC |
1028 | * |
1029 | * To do this, we first need to shut down the background log work so it is not | |
1030 | * trying to cover the log as we clean up. We then need to unpin all objects in | |
1031 | * the log so we can then flush them out. Once they have completed their IO and | |
1032 | * run the callbacks removing themselves from the AIL, we can write the unmount | |
c75921a7 | 1033 | * record. |
1da177e4 LT |
1034 | */ |
1035 | void | |
c75921a7 DC |
1036 | xfs_log_quiesce( |
1037 | struct xfs_mount *mp) | |
1da177e4 | 1038 | { |
f661f1e0 | 1039 | cancel_delayed_work_sync(&mp->m_log->l_work); |
cf2931db DC |
1040 | xfs_log_force(mp, XFS_LOG_SYNC); |
1041 | ||
1042 | /* | |
1043 | * The superblock buffer is uncached and while xfs_ail_push_all_sync() | |
1044 | * will push it, xfs_wait_buftarg() will not wait for it. Further, | |
1045 | * xfs_buf_iowait() cannot be used because it was pushed with the | |
1046 | * XBF_ASYNC flag set, so we need to use a lock/unlock pair to wait for | |
1047 | * the IO to complete. | |
1048 | */ | |
1049 | xfs_ail_push_all_sync(mp->m_ail); | |
1050 | xfs_wait_buftarg(mp->m_ddev_targp); | |
1051 | xfs_buf_lock(mp->m_sb_bp); | |
1052 | xfs_buf_unlock(mp->m_sb_bp); | |
1053 | ||
1054 | xfs_log_unmount_write(mp); | |
c75921a7 DC |
1055 | } |
1056 | ||
1057 | /* | |
1058 | * Shut down and release the AIL and Log. | |
1059 | * | |
1060 | * During unmount, we need to ensure we flush all the dirty metadata objects | |
1061 | * from the AIL so that the log is empty before we write the unmount record to | |
1062 | * the log. Once this is done, we can tear down the AIL and the log. | |
1063 | */ | |
1064 | void | |
1065 | xfs_log_unmount( | |
1066 | struct xfs_mount *mp) | |
1067 | { | |
1068 | xfs_log_quiesce(mp); | |
cf2931db | 1069 | |
249a8c11 | 1070 | xfs_trans_ail_destroy(mp); |
baff4e44 BF |
1071 | |
1072 | xfs_sysfs_del(&mp->m_log->l_kobj); | |
1073 | ||
c41564b5 | 1074 | xlog_dealloc_log(mp->m_log); |
1da177e4 LT |
1075 | } |
1076 | ||
43f5efc5 DC |
1077 | void |
1078 | xfs_log_item_init( | |
1079 | struct xfs_mount *mp, | |
1080 | struct xfs_log_item *item, | |
1081 | int type, | |
272e42b2 | 1082 | const struct xfs_item_ops *ops) |
43f5efc5 DC |
1083 | { |
1084 | item->li_mountp = mp; | |
1085 | item->li_ailp = mp->m_ail; | |
1086 | item->li_type = type; | |
1087 | item->li_ops = ops; | |
71e330b5 DC |
1088 | item->li_lv = NULL; |
1089 | ||
1090 | INIT_LIST_HEAD(&item->li_ail); | |
1091 | INIT_LIST_HEAD(&item->li_cil); | |
643c8c05 | 1092 | INIT_LIST_HEAD(&item->li_bio_list); |
e6631f85 | 1093 | INIT_LIST_HEAD(&item->li_trans); |
43f5efc5 DC |
1094 | } |
1095 | ||
09a423a3 CH |
1096 | /* |
1097 | * Wake up processes waiting for log space after we have moved the log tail. | |
09a423a3 | 1098 | */ |
1da177e4 | 1099 | void |
09a423a3 | 1100 | xfs_log_space_wake( |
cfb7cdca | 1101 | struct xfs_mount *mp) |
1da177e4 | 1102 | { |
ad223e60 | 1103 | struct xlog *log = mp->m_log; |
cfb7cdca | 1104 | int free_bytes; |
1da177e4 | 1105 | |
1da177e4 LT |
1106 | if (XLOG_FORCED_SHUTDOWN(log)) |
1107 | return; | |
1da177e4 | 1108 | |
28496968 | 1109 | if (!list_empty_careful(&log->l_write_head.waiters)) { |
09a423a3 CH |
1110 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); |
1111 | ||
28496968 CH |
1112 | spin_lock(&log->l_write_head.lock); |
1113 | free_bytes = xlog_space_left(log, &log->l_write_head.grant); | |
e179840d | 1114 | xlog_grant_head_wake(log, &log->l_write_head, &free_bytes); |
28496968 | 1115 | spin_unlock(&log->l_write_head.lock); |
1da177e4 | 1116 | } |
10547941 | 1117 | |
28496968 | 1118 | if (!list_empty_careful(&log->l_reserve_head.waiters)) { |
09a423a3 CH |
1119 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); |
1120 | ||
28496968 CH |
1121 | spin_lock(&log->l_reserve_head.lock); |
1122 | free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); | |
e179840d | 1123 | xlog_grant_head_wake(log, &log->l_reserve_head, &free_bytes); |
28496968 | 1124 | spin_unlock(&log->l_reserve_head.lock); |
1da177e4 | 1125 | } |
3f16b985 | 1126 | } |
1da177e4 LT |
1127 | |
1128 | /* | |
2c6e24ce DC |
1129 | * Determine if we have a transaction that has gone to disk that needs to be |
1130 | * covered. To begin the transition to the idle state firstly the log needs to | |
1131 | * be idle. That means the CIL, the AIL and the iclogs needs to be empty before | |
1132 | * we start attempting to cover the log. | |
b6f8dd49 | 1133 | * |
2c6e24ce DC |
1134 | * Only if we are then in a state where covering is needed, the caller is |
1135 | * informed that dummy transactions are required to move the log into the idle | |
1136 | * state. | |
1137 | * | |
1138 | * If there are any items in the AIl or CIL, then we do not want to attempt to | |
1139 | * cover the log as we may be in a situation where there isn't log space | |
1140 | * available to run a dummy transaction and this can lead to deadlocks when the | |
1141 | * tail of the log is pinned by an item that is modified in the CIL. Hence | |
1142 | * there's no point in running a dummy transaction at this point because we | |
1143 | * can't start trying to idle the log until both the CIL and AIL are empty. | |
1da177e4 | 1144 | */ |
0d5a75e9 | 1145 | static int |
1da177e4 LT |
1146 | xfs_log_need_covered(xfs_mount_t *mp) |
1147 | { | |
9a8d2fdb | 1148 | struct xlog *log = mp->m_log; |
2c6e24ce | 1149 | int needed = 0; |
1da177e4 | 1150 | |
91ee575f | 1151 | if (!xfs_fs_writable(mp, SB_FREEZE_WRITE)) |
1da177e4 LT |
1152 | return 0; |
1153 | ||
2c6e24ce DC |
1154 | if (!xlog_cil_empty(log)) |
1155 | return 0; | |
1156 | ||
b22cd72c | 1157 | spin_lock(&log->l_icloglock); |
b6f8dd49 DC |
1158 | switch (log->l_covered_state) { |
1159 | case XLOG_STATE_COVER_DONE: | |
1160 | case XLOG_STATE_COVER_DONE2: | |
1161 | case XLOG_STATE_COVER_IDLE: | |
1162 | break; | |
1163 | case XLOG_STATE_COVER_NEED: | |
1164 | case XLOG_STATE_COVER_NEED2: | |
2c6e24ce DC |
1165 | if (xfs_ail_min_lsn(log->l_ailp)) |
1166 | break; | |
1167 | if (!xlog_iclogs_empty(log)) | |
1168 | break; | |
1169 | ||
1170 | needed = 1; | |
1171 | if (log->l_covered_state == XLOG_STATE_COVER_NEED) | |
1172 | log->l_covered_state = XLOG_STATE_COVER_DONE; | |
1173 | else | |
1174 | log->l_covered_state = XLOG_STATE_COVER_DONE2; | |
1175 | break; | |
b6f8dd49 | 1176 | default: |
1da177e4 | 1177 | needed = 1; |
b6f8dd49 | 1178 | break; |
1da177e4 | 1179 | } |
b22cd72c | 1180 | spin_unlock(&log->l_icloglock); |
014c2544 | 1181 | return needed; |
1da177e4 LT |
1182 | } |
1183 | ||
09a423a3 | 1184 | /* |
1da177e4 LT |
1185 | * We may be holding the log iclog lock upon entering this routine. |
1186 | */ | |
1187 | xfs_lsn_t | |
1c304625 | 1188 | xlog_assign_tail_lsn_locked( |
1c3cb9ec | 1189 | struct xfs_mount *mp) |
1da177e4 | 1190 | { |
ad223e60 | 1191 | struct xlog *log = mp->m_log; |
1c304625 CH |
1192 | struct xfs_log_item *lip; |
1193 | xfs_lsn_t tail_lsn; | |
1194 | ||
57e80956 | 1195 | assert_spin_locked(&mp->m_ail->ail_lock); |
1da177e4 | 1196 | |
09a423a3 CH |
1197 | /* |
1198 | * To make sure we always have a valid LSN for the log tail we keep | |
1199 | * track of the last LSN which was committed in log->l_last_sync_lsn, | |
1c304625 | 1200 | * and use that when the AIL was empty. |
09a423a3 | 1201 | */ |
1c304625 CH |
1202 | lip = xfs_ail_min(mp->m_ail); |
1203 | if (lip) | |
1204 | tail_lsn = lip->li_lsn; | |
1205 | else | |
84f3c683 | 1206 | tail_lsn = atomic64_read(&log->l_last_sync_lsn); |
750b9c90 | 1207 | trace_xfs_log_assign_tail_lsn(log, tail_lsn); |
1c3cb9ec | 1208 | atomic64_set(&log->l_tail_lsn, tail_lsn); |
1da177e4 | 1209 | return tail_lsn; |
1c3cb9ec | 1210 | } |
1da177e4 | 1211 | |
1c304625 CH |
1212 | xfs_lsn_t |
1213 | xlog_assign_tail_lsn( | |
1214 | struct xfs_mount *mp) | |
1215 | { | |
1216 | xfs_lsn_t tail_lsn; | |
1217 | ||
57e80956 | 1218 | spin_lock(&mp->m_ail->ail_lock); |
1c304625 | 1219 | tail_lsn = xlog_assign_tail_lsn_locked(mp); |
57e80956 | 1220 | spin_unlock(&mp->m_ail->ail_lock); |
1c304625 CH |
1221 | |
1222 | return tail_lsn; | |
1223 | } | |
1224 | ||
1da177e4 LT |
1225 | /* |
1226 | * Return the space in the log between the tail and the head. The head | |
1227 | * is passed in the cycle/bytes formal parms. In the special case where | |
1228 | * the reserve head has wrapped passed the tail, this calculation is no | |
1229 | * longer valid. In this case, just return 0 which means there is no space | |
1230 | * in the log. This works for all places where this function is called | |
1231 | * with the reserve head. Of course, if the write head were to ever | |
1232 | * wrap the tail, we should blow up. Rather than catch this case here, | |
1233 | * we depend on other ASSERTions in other parts of the code. XXXmiken | |
1234 | * | |
1235 | * This code also handles the case where the reservation head is behind | |
1236 | * the tail. The details of this case are described below, but the end | |
1237 | * result is that we return the size of the log as the amount of space left. | |
1238 | */ | |
a8272ce0 | 1239 | STATIC int |
a69ed03c | 1240 | xlog_space_left( |
ad223e60 | 1241 | struct xlog *log, |
c8a09ff8 | 1242 | atomic64_t *head) |
1da177e4 | 1243 | { |
a69ed03c DC |
1244 | int free_bytes; |
1245 | int tail_bytes; | |
1246 | int tail_cycle; | |
1247 | int head_cycle; | |
1248 | int head_bytes; | |
1da177e4 | 1249 | |
a69ed03c | 1250 | xlog_crack_grant_head(head, &head_cycle, &head_bytes); |
1c3cb9ec DC |
1251 | xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_bytes); |
1252 | tail_bytes = BBTOB(tail_bytes); | |
a69ed03c DC |
1253 | if (tail_cycle == head_cycle && head_bytes >= tail_bytes) |
1254 | free_bytes = log->l_logsize - (head_bytes - tail_bytes); | |
1255 | else if (tail_cycle + 1 < head_cycle) | |
1da177e4 | 1256 | return 0; |
a69ed03c DC |
1257 | else if (tail_cycle < head_cycle) { |
1258 | ASSERT(tail_cycle == (head_cycle - 1)); | |
1259 | free_bytes = tail_bytes - head_bytes; | |
1da177e4 LT |
1260 | } else { |
1261 | /* | |
1262 | * The reservation head is behind the tail. | |
1263 | * In this case we just want to return the size of the | |
1264 | * log as the amount of space left. | |
1265 | */ | |
f41febd2 | 1266 | xfs_alert(log->l_mp, "xlog_space_left: head behind tail"); |
a0fa2b67 | 1267 | xfs_alert(log->l_mp, |
f41febd2 JP |
1268 | " tail_cycle = %d, tail_bytes = %d", |
1269 | tail_cycle, tail_bytes); | |
1270 | xfs_alert(log->l_mp, | |
1271 | " GH cycle = %d, GH bytes = %d", | |
1272 | head_cycle, head_bytes); | |
1da177e4 LT |
1273 | ASSERT(0); |
1274 | free_bytes = log->l_logsize; | |
1275 | } | |
1276 | return free_bytes; | |
a69ed03c | 1277 | } |
1da177e4 LT |
1278 | |
1279 | ||
0d5a75e9 | 1280 | static void |
79b54d9b CH |
1281 | xlog_ioend_work( |
1282 | struct work_struct *work) | |
1da177e4 | 1283 | { |
79b54d9b CH |
1284 | struct xlog_in_core *iclog = |
1285 | container_of(work, struct xlog_in_core, ic_end_io_work); | |
1286 | struct xlog *log = iclog->ic_log; | |
d15cbf2f | 1287 | bool aborted = false; |
79b54d9b | 1288 | int error; |
1da177e4 | 1289 | |
79b54d9b | 1290 | error = blk_status_to_errno(iclog->ic_bio.bi_status); |
366fc4b8 CH |
1291 | #ifdef DEBUG |
1292 | /* treat writes with injected CRC errors as failed */ | |
1293 | if (iclog->ic_fail_crc) | |
79b54d9b | 1294 | error = -EIO; |
366fc4b8 CH |
1295 | #endif |
1296 | ||
1da177e4 | 1297 | /* |
366fc4b8 | 1298 | * Race to shutdown the filesystem if we see an error. |
1da177e4 | 1299 | */ |
79b54d9b CH |
1300 | if (XFS_TEST_ERROR(error, log->l_mp, XFS_ERRTAG_IODONE_IOERR)) { |
1301 | xfs_alert(log->l_mp, "log I/O error %d", error); | |
1302 | xfs_force_shutdown(log->l_mp, SHUTDOWN_LOG_IO_ERROR); | |
1da177e4 LT |
1303 | /* |
1304 | * This flag will be propagated to the trans-committed | |
1305 | * callback routines to let them know that the log-commit | |
1306 | * didn't succeed. | |
1307 | */ | |
d15cbf2f | 1308 | aborted = true; |
1858bb0b | 1309 | } else if (iclog->ic_state == XLOG_STATE_IOERROR) { |
d15cbf2f | 1310 | aborted = true; |
1da177e4 | 1311 | } |
3db296f3 | 1312 | |
1da177e4 | 1313 | xlog_state_done_syncing(iclog, aborted); |
79b54d9b | 1314 | bio_uninit(&iclog->ic_bio); |
9c23eccc | 1315 | |
3db296f3 | 1316 | /* |
79b54d9b CH |
1317 | * Drop the lock to signal that we are done. Nothing references the |
1318 | * iclog after this, so an unmount waiting on this lock can now tear it | |
1319 | * down safely. As such, it is unsafe to reference the iclog after the | |
1320 | * unlock as we could race with it being freed. | |
3db296f3 | 1321 | */ |
79b54d9b | 1322 | up(&iclog->ic_sema); |
c3f8fc73 | 1323 | } |
1da177e4 | 1324 | |
1da177e4 LT |
1325 | /* |
1326 | * Return size of each in-core log record buffer. | |
1327 | * | |
9da096fd | 1328 | * All machines get 8 x 32kB buffers by default, unless tuned otherwise. |
1da177e4 LT |
1329 | * |
1330 | * If the filesystem blocksize is too large, we may need to choose a | |
1331 | * larger size since the directory code currently logs entire blocks. | |
1332 | */ | |
1da177e4 | 1333 | STATIC void |
9a8d2fdb MT |
1334 | xlog_get_iclog_buffer_size( |
1335 | struct xfs_mount *mp, | |
1336 | struct xlog *log) | |
1da177e4 | 1337 | { |
1cb51258 | 1338 | if (mp->m_logbufs <= 0) |
4f62282a CH |
1339 | mp->m_logbufs = XLOG_MAX_ICLOGS; |
1340 | if (mp->m_logbsize <= 0) | |
1341 | mp->m_logbsize = XLOG_BIG_RECORD_BSIZE; | |
1342 | ||
1343 | log->l_iclog_bufs = mp->m_logbufs; | |
1344 | log->l_iclog_size = mp->m_logbsize; | |
1da177e4 LT |
1345 | |
1346 | /* | |
4f62282a | 1347 | * # headers = size / 32k - one header holds cycles from 32k of data. |
1da177e4 | 1348 | */ |
4f62282a CH |
1349 | log->l_iclog_heads = |
1350 | DIV_ROUND_UP(mp->m_logbsize, XLOG_HEADER_CYCLE_SIZE); | |
1351 | log->l_iclog_hsize = log->l_iclog_heads << BBSHIFT; | |
1352 | } | |
1da177e4 | 1353 | |
f661f1e0 DC |
1354 | void |
1355 | xfs_log_work_queue( | |
1356 | struct xfs_mount *mp) | |
1357 | { | |
696a5620 | 1358 | queue_delayed_work(mp->m_sync_workqueue, &mp->m_log->l_work, |
f661f1e0 DC |
1359 | msecs_to_jiffies(xfs_syncd_centisecs * 10)); |
1360 | } | |
1361 | ||
1362 | /* | |
1363 | * Every sync period we need to unpin all items in the AIL and push them to | |
1364 | * disk. If there is nothing dirty, then we might need to cover the log to | |
1365 | * indicate that the filesystem is idle. | |
1366 | */ | |
0d5a75e9 | 1367 | static void |
f661f1e0 DC |
1368 | xfs_log_worker( |
1369 | struct work_struct *work) | |
1370 | { | |
1371 | struct xlog *log = container_of(to_delayed_work(work), | |
1372 | struct xlog, l_work); | |
1373 | struct xfs_mount *mp = log->l_mp; | |
1374 | ||
1375 | /* dgc: errors ignored - not fatal and nowhere to report them */ | |
61e63ecb DC |
1376 | if (xfs_log_need_covered(mp)) { |
1377 | /* | |
1378 | * Dump a transaction into the log that contains no real change. | |
1379 | * This is needed to stamp the current tail LSN into the log | |
1380 | * during the covering operation. | |
1381 | * | |
1382 | * We cannot use an inode here for this - that will push dirty | |
1383 | * state back up into the VFS and then periodic inode flushing | |
1384 | * will prevent log covering from making progress. Hence we | |
1385 | * synchronously log the superblock instead to ensure the | |
1386 | * superblock is immediately unpinned and can be written back. | |
1387 | */ | |
1388 | xfs_sync_sb(mp, true); | |
1389 | } else | |
f661f1e0 DC |
1390 | xfs_log_force(mp, 0); |
1391 | ||
1392 | /* start pushing all the metadata that is currently dirty */ | |
1393 | xfs_ail_push_all(mp->m_ail); | |
1394 | ||
1395 | /* queue us up again */ | |
1396 | xfs_log_work_queue(mp); | |
1397 | } | |
1398 | ||
1da177e4 LT |
1399 | /* |
1400 | * This routine initializes some of the log structure for a given mount point. | |
1401 | * Its primary purpose is to fill in enough, so recovery can occur. However, | |
1402 | * some other stuff may be filled in too. | |
1403 | */ | |
9a8d2fdb MT |
1404 | STATIC struct xlog * |
1405 | xlog_alloc_log( | |
1406 | struct xfs_mount *mp, | |
1407 | struct xfs_buftarg *log_target, | |
1408 | xfs_daddr_t blk_offset, | |
1409 | int num_bblks) | |
1da177e4 | 1410 | { |
9a8d2fdb | 1411 | struct xlog *log; |
1da177e4 LT |
1412 | xlog_rec_header_t *head; |
1413 | xlog_in_core_t **iclogp; | |
1414 | xlog_in_core_t *iclog, *prev_iclog=NULL; | |
1da177e4 | 1415 | int i; |
2451337d | 1416 | int error = -ENOMEM; |
69ce58f0 | 1417 | uint log2_size = 0; |
1da177e4 | 1418 | |
9a8d2fdb | 1419 | log = kmem_zalloc(sizeof(struct xlog), KM_MAYFAIL); |
a6cb767e | 1420 | if (!log) { |
a0fa2b67 | 1421 | xfs_warn(mp, "Log allocation failed: No memory!"); |
a6cb767e DC |
1422 | goto out; |
1423 | } | |
1da177e4 LT |
1424 | |
1425 | log->l_mp = mp; | |
1426 | log->l_targ = log_target; | |
1427 | log->l_logsize = BBTOB(num_bblks); | |
1428 | log->l_logBBstart = blk_offset; | |
1429 | log->l_logBBsize = num_bblks; | |
1430 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
1431 | log->l_flags |= XLOG_ACTIVE_RECOVERY; | |
f661f1e0 | 1432 | INIT_DELAYED_WORK(&log->l_work, xfs_log_worker); |
1da177e4 LT |
1433 | |
1434 | log->l_prev_block = -1; | |
1da177e4 | 1435 | /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ |
1c3cb9ec DC |
1436 | xlog_assign_atomic_lsn(&log->l_tail_lsn, 1, 0); |
1437 | xlog_assign_atomic_lsn(&log->l_last_sync_lsn, 1, 0); | |
1da177e4 | 1438 | log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ |
c303c5b8 CH |
1439 | |
1440 | xlog_grant_head_init(&log->l_reserve_head); | |
1441 | xlog_grant_head_init(&log->l_write_head); | |
1da177e4 | 1442 | |
2451337d | 1443 | error = -EFSCORRUPTED; |
62118709 | 1444 | if (xfs_sb_version_hassector(&mp->m_sb)) { |
69ce58f0 AE |
1445 | log2_size = mp->m_sb.sb_logsectlog; |
1446 | if (log2_size < BBSHIFT) { | |
a0fa2b67 DC |
1447 | xfs_warn(mp, "Log sector size too small (0x%x < 0x%x)", |
1448 | log2_size, BBSHIFT); | |
a6cb767e DC |
1449 | goto out_free_log; |
1450 | } | |
1451 | ||
69ce58f0 AE |
1452 | log2_size -= BBSHIFT; |
1453 | if (log2_size > mp->m_sectbb_log) { | |
a0fa2b67 DC |
1454 | xfs_warn(mp, "Log sector size too large (0x%x > 0x%x)", |
1455 | log2_size, mp->m_sectbb_log); | |
a6cb767e DC |
1456 | goto out_free_log; |
1457 | } | |
69ce58f0 AE |
1458 | |
1459 | /* for larger sector sizes, must have v2 or external log */ | |
1460 | if (log2_size && log->l_logBBstart > 0 && | |
1461 | !xfs_sb_version_haslogv2(&mp->m_sb)) { | |
a0fa2b67 DC |
1462 | xfs_warn(mp, |
1463 | "log sector size (0x%x) invalid for configuration.", | |
1464 | log2_size); | |
a6cb767e DC |
1465 | goto out_free_log; |
1466 | } | |
1da177e4 | 1467 | } |
69ce58f0 | 1468 | log->l_sectBBsize = 1 << log2_size; |
1da177e4 LT |
1469 | |
1470 | xlog_get_iclog_buffer_size(mp, log); | |
1471 | ||
007c61c6 | 1472 | spin_lock_init(&log->l_icloglock); |
eb40a875 | 1473 | init_waitqueue_head(&log->l_flush_wait); |
1da177e4 | 1474 | |
1da177e4 LT |
1475 | iclogp = &log->l_iclog; |
1476 | /* | |
1477 | * The amount of memory to allocate for the iclog structure is | |
1478 | * rather funky due to the way the structure is defined. It is | |
1479 | * done this way so that we can use different sizes for machines | |
1480 | * with different amounts of memory. See the definition of | |
1481 | * xlog_in_core_t in xfs_log_priv.h for details. | |
1482 | */ | |
1da177e4 | 1483 | ASSERT(log->l_iclog_size >= 4096); |
79b54d9b | 1484 | for (i = 0; i < log->l_iclog_bufs; i++) { |
f8f9ee47 | 1485 | int align_mask = xfs_buftarg_dma_alignment(mp->m_logdev_targp); |
89b171ac CH |
1486 | size_t bvec_size = howmany(log->l_iclog_size, PAGE_SIZE) * |
1487 | sizeof(struct bio_vec); | |
79b54d9b CH |
1488 | |
1489 | iclog = kmem_zalloc(sizeof(*iclog) + bvec_size, KM_MAYFAIL); | |
1490 | if (!iclog) | |
644c3567 DC |
1491 | goto out_free_iclog; |
1492 | ||
79b54d9b | 1493 | *iclogp = iclog; |
1da177e4 LT |
1494 | iclog->ic_prev = prev_iclog; |
1495 | prev_iclog = iclog; | |
1fa40b01 | 1496 | |
f8f9ee47 | 1497 | iclog->ic_data = kmem_alloc_io(log->l_iclog_size, align_mask, |
3219e8cf | 1498 | KM_MAYFAIL | KM_ZERO); |
79b54d9b | 1499 | if (!iclog->ic_data) |
644c3567 | 1500 | goto out_free_iclog; |
4679b2d3 | 1501 | #ifdef DEBUG |
5809d5e0 | 1502 | log->l_iclog_bak[i] = &iclog->ic_header; |
4679b2d3 | 1503 | #endif |
1da177e4 LT |
1504 | head = &iclog->ic_header; |
1505 | memset(head, 0, sizeof(xlog_rec_header_t)); | |
b53e675d CH |
1506 | head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM); |
1507 | head->h_version = cpu_to_be32( | |
62118709 | 1508 | xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? 2 : 1); |
b53e675d | 1509 | head->h_size = cpu_to_be32(log->l_iclog_size); |
1da177e4 | 1510 | /* new fields */ |
b53e675d | 1511 | head->h_fmt = cpu_to_be32(XLOG_FMT); |
1da177e4 LT |
1512 | memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); |
1513 | ||
79b54d9b | 1514 | iclog->ic_size = log->l_iclog_size - log->l_iclog_hsize; |
1da177e4 LT |
1515 | iclog->ic_state = XLOG_STATE_ACTIVE; |
1516 | iclog->ic_log = log; | |
114d23aa DC |
1517 | atomic_set(&iclog->ic_refcnt, 0); |
1518 | spin_lock_init(&iclog->ic_callback_lock); | |
89ae379d | 1519 | INIT_LIST_HEAD(&iclog->ic_callbacks); |
b28708d6 | 1520 | iclog->ic_datap = (char *)iclog->ic_data + log->l_iclog_hsize; |
1da177e4 | 1521 | |
eb40a875 DC |
1522 | init_waitqueue_head(&iclog->ic_force_wait); |
1523 | init_waitqueue_head(&iclog->ic_write_wait); | |
79b54d9b CH |
1524 | INIT_WORK(&iclog->ic_end_io_work, xlog_ioend_work); |
1525 | sema_init(&iclog->ic_sema, 1); | |
1da177e4 LT |
1526 | |
1527 | iclogp = &iclog->ic_next; | |
1528 | } | |
1529 | *iclogp = log->l_iclog; /* complete ring */ | |
1530 | log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ | |
1531 | ||
1058d0f5 CH |
1532 | log->l_ioend_workqueue = alloc_workqueue("xfs-log/%s", |
1533 | WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_HIGHPRI, 0, | |
e1d3d218 | 1534 | mp->m_super->s_id); |
1058d0f5 CH |
1535 | if (!log->l_ioend_workqueue) |
1536 | goto out_free_iclog; | |
1537 | ||
71e330b5 DC |
1538 | error = xlog_cil_init(log); |
1539 | if (error) | |
1058d0f5 | 1540 | goto out_destroy_workqueue; |
1da177e4 | 1541 | return log; |
644c3567 | 1542 | |
1058d0f5 CH |
1543 | out_destroy_workqueue: |
1544 | destroy_workqueue(log->l_ioend_workqueue); | |
644c3567 DC |
1545 | out_free_iclog: |
1546 | for (iclog = log->l_iclog; iclog; iclog = prev_iclog) { | |
1547 | prev_iclog = iclog->ic_next; | |
79b54d9b | 1548 | kmem_free(iclog->ic_data); |
644c3567 | 1549 | kmem_free(iclog); |
798a9cad BF |
1550 | if (prev_iclog == log->l_iclog) |
1551 | break; | |
644c3567 | 1552 | } |
644c3567 DC |
1553 | out_free_log: |
1554 | kmem_free(log); | |
a6cb767e | 1555 | out: |
2451337d | 1556 | return ERR_PTR(error); |
1da177e4 LT |
1557 | } /* xlog_alloc_log */ |
1558 | ||
1559 | ||
1560 | /* | |
1561 | * Write out the commit record of a transaction associated with the given | |
1562 | * ticket. Return the lsn of the commit record. | |
1563 | */ | |
1564 | STATIC int | |
55b66332 | 1565 | xlog_commit_record( |
ad223e60 | 1566 | struct xlog *log, |
55b66332 DC |
1567 | struct xlog_ticket *ticket, |
1568 | struct xlog_in_core **iclog, | |
1569 | xfs_lsn_t *commitlsnp) | |
1da177e4 | 1570 | { |
55b66332 DC |
1571 | struct xfs_mount *mp = log->l_mp; |
1572 | int error; | |
1573 | struct xfs_log_iovec reg = { | |
1574 | .i_addr = NULL, | |
1575 | .i_len = 0, | |
1576 | .i_type = XLOG_REG_TYPE_COMMIT, | |
1577 | }; | |
1578 | struct xfs_log_vec vec = { | |
1579 | .lv_niovecs = 1, | |
1580 | .lv_iovecp = ®, | |
1581 | }; | |
1da177e4 LT |
1582 | |
1583 | ASSERT_ALWAYS(iclog); | |
55b66332 DC |
1584 | error = xlog_write(log, &vec, ticket, commitlsnp, iclog, |
1585 | XLOG_COMMIT_TRANS); | |
1586 | if (error) | |
7d04a335 | 1587 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
014c2544 | 1588 | return error; |
55b66332 | 1589 | } |
1da177e4 LT |
1590 | |
1591 | /* | |
1592 | * Push on the buffer cache code if we ever use more than 75% of the on-disk | |
1593 | * log space. This code pushes on the lsn which would supposedly free up | |
1594 | * the 25% which we want to leave free. We may need to adopt a policy which | |
1595 | * pushes on an lsn which is further along in the log once we reach the high | |
1596 | * water mark. In this manner, we would be creating a low water mark. | |
1597 | */ | |
a8272ce0 | 1598 | STATIC void |
2ced19cb | 1599 | xlog_grant_push_ail( |
ad223e60 | 1600 | struct xlog *log, |
2ced19cb | 1601 | int need_bytes) |
1da177e4 | 1602 | { |
2ced19cb | 1603 | xfs_lsn_t threshold_lsn = 0; |
84f3c683 | 1604 | xfs_lsn_t last_sync_lsn; |
2ced19cb DC |
1605 | int free_blocks; |
1606 | int free_bytes; | |
1607 | int threshold_block; | |
1608 | int threshold_cycle; | |
1609 | int free_threshold; | |
1610 | ||
1611 | ASSERT(BTOBB(need_bytes) < log->l_logBBsize); | |
1612 | ||
28496968 | 1613 | free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); |
2ced19cb DC |
1614 | free_blocks = BTOBBT(free_bytes); |
1615 | ||
1616 | /* | |
1617 | * Set the threshold for the minimum number of free blocks in the | |
1618 | * log to the maximum of what the caller needs, one quarter of the | |
1619 | * log, and 256 blocks. | |
1620 | */ | |
1621 | free_threshold = BTOBB(need_bytes); | |
9bb54cb5 DC |
1622 | free_threshold = max(free_threshold, (log->l_logBBsize >> 2)); |
1623 | free_threshold = max(free_threshold, 256); | |
2ced19cb DC |
1624 | if (free_blocks >= free_threshold) |
1625 | return; | |
1626 | ||
1c3cb9ec DC |
1627 | xlog_crack_atomic_lsn(&log->l_tail_lsn, &threshold_cycle, |
1628 | &threshold_block); | |
1629 | threshold_block += free_threshold; | |
1da177e4 | 1630 | if (threshold_block >= log->l_logBBsize) { |
2ced19cb DC |
1631 | threshold_block -= log->l_logBBsize; |
1632 | threshold_cycle += 1; | |
1da177e4 | 1633 | } |
2ced19cb DC |
1634 | threshold_lsn = xlog_assign_lsn(threshold_cycle, |
1635 | threshold_block); | |
1636 | /* | |
1637 | * Don't pass in an lsn greater than the lsn of the last | |
84f3c683 DC |
1638 | * log record known to be on disk. Use a snapshot of the last sync lsn |
1639 | * so that it doesn't change between the compare and the set. | |
1da177e4 | 1640 | */ |
84f3c683 DC |
1641 | last_sync_lsn = atomic64_read(&log->l_last_sync_lsn); |
1642 | if (XFS_LSN_CMP(threshold_lsn, last_sync_lsn) > 0) | |
1643 | threshold_lsn = last_sync_lsn; | |
2ced19cb DC |
1644 | |
1645 | /* | |
1646 | * Get the transaction layer to kick the dirty buffers out to | |
1647 | * disk asynchronously. No point in trying to do this if | |
1648 | * the filesystem is shutting down. | |
1649 | */ | |
1650 | if (!XLOG_FORCED_SHUTDOWN(log)) | |
fd074841 | 1651 | xfs_ail_push(log->l_ailp, threshold_lsn); |
2ced19cb | 1652 | } |
1da177e4 | 1653 | |
0e446be4 CH |
1654 | /* |
1655 | * Stamp cycle number in every block | |
1656 | */ | |
1657 | STATIC void | |
1658 | xlog_pack_data( | |
1659 | struct xlog *log, | |
1660 | struct xlog_in_core *iclog, | |
1661 | int roundoff) | |
1662 | { | |
1663 | int i, j, k; | |
1664 | int size = iclog->ic_offset + roundoff; | |
1665 | __be32 cycle_lsn; | |
b2a922cd | 1666 | char *dp; |
0e446be4 CH |
1667 | |
1668 | cycle_lsn = CYCLE_LSN_DISK(iclog->ic_header.h_lsn); | |
1669 | ||
1670 | dp = iclog->ic_datap; | |
1671 | for (i = 0; i < BTOBB(size); i++) { | |
1672 | if (i >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) | |
1673 | break; | |
1674 | iclog->ic_header.h_cycle_data[i] = *(__be32 *)dp; | |
1675 | *(__be32 *)dp = cycle_lsn; | |
1676 | dp += BBSIZE; | |
1677 | } | |
1678 | ||
1679 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) { | |
1680 | xlog_in_core_2_t *xhdr = iclog->ic_data; | |
1681 | ||
1682 | for ( ; i < BTOBB(size); i++) { | |
1683 | j = i / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
1684 | k = i % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
1685 | xhdr[j].hic_xheader.xh_cycle_data[k] = *(__be32 *)dp; | |
1686 | *(__be32 *)dp = cycle_lsn; | |
1687 | dp += BBSIZE; | |
1688 | } | |
1689 | ||
1690 | for (i = 1; i < log->l_iclog_heads; i++) | |
1691 | xhdr[i].hic_xheader.xh_cycle = cycle_lsn; | |
1692 | } | |
1693 | } | |
1694 | ||
1695 | /* | |
1696 | * Calculate the checksum for a log buffer. | |
1697 | * | |
1698 | * This is a little more complicated than it should be because the various | |
1699 | * headers and the actual data are non-contiguous. | |
1700 | */ | |
f9668a09 | 1701 | __le32 |
0e446be4 CH |
1702 | xlog_cksum( |
1703 | struct xlog *log, | |
1704 | struct xlog_rec_header *rhead, | |
1705 | char *dp, | |
1706 | int size) | |
1707 | { | |
c8ce540d | 1708 | uint32_t crc; |
0e446be4 CH |
1709 | |
1710 | /* first generate the crc for the record header ... */ | |
cae028df | 1711 | crc = xfs_start_cksum_update((char *)rhead, |
0e446be4 CH |
1712 | sizeof(struct xlog_rec_header), |
1713 | offsetof(struct xlog_rec_header, h_crc)); | |
1714 | ||
1715 | /* ... then for additional cycle data for v2 logs ... */ | |
1716 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) { | |
1717 | union xlog_in_core2 *xhdr = (union xlog_in_core2 *)rhead; | |
1718 | int i; | |
a3f20014 | 1719 | int xheads; |
0e446be4 | 1720 | |
a3f20014 BF |
1721 | xheads = size / XLOG_HEADER_CYCLE_SIZE; |
1722 | if (size % XLOG_HEADER_CYCLE_SIZE) | |
1723 | xheads++; | |
0e446be4 | 1724 | |
a3f20014 | 1725 | for (i = 1; i < xheads; i++) { |
0e446be4 CH |
1726 | crc = crc32c(crc, &xhdr[i].hic_xheader, |
1727 | sizeof(struct xlog_rec_ext_header)); | |
1728 | } | |
1729 | } | |
1730 | ||
1731 | /* ... and finally for the payload */ | |
1732 | crc = crc32c(crc, dp, size); | |
1733 | ||
1734 | return xfs_end_cksum(crc); | |
1735 | } | |
1736 | ||
79b54d9b CH |
1737 | static void |
1738 | xlog_bio_end_io( | |
1739 | struct bio *bio) | |
1740 | { | |
1741 | struct xlog_in_core *iclog = bio->bi_private; | |
1742 | ||
1058d0f5 | 1743 | queue_work(iclog->ic_log->l_ioend_workqueue, |
79b54d9b CH |
1744 | &iclog->ic_end_io_work); |
1745 | } | |
1746 | ||
1747 | static void | |
1748 | xlog_map_iclog_data( | |
1749 | struct bio *bio, | |
1750 | void *data, | |
1751 | size_t count) | |
1752 | { | |
1753 | do { | |
1754 | struct page *page = kmem_to_page(data); | |
1755 | unsigned int off = offset_in_page(data); | |
1756 | size_t len = min_t(size_t, count, PAGE_SIZE - off); | |
1757 | ||
1758 | WARN_ON_ONCE(bio_add_page(bio, page, len, off) != len); | |
1759 | ||
1760 | data += len; | |
1761 | count -= len; | |
1762 | } while (count); | |
1763 | } | |
1764 | ||
94860a30 CH |
1765 | STATIC void |
1766 | xlog_write_iclog( | |
1767 | struct xlog *log, | |
1768 | struct xlog_in_core *iclog, | |
94860a30 | 1769 | uint64_t bno, |
79b54d9b | 1770 | unsigned int count, |
94860a30 | 1771 | bool need_flush) |
873ff550 | 1772 | { |
94860a30 | 1773 | ASSERT(bno < log->l_logBBsize); |
94860a30 CH |
1774 | |
1775 | /* | |
1776 | * We lock the iclogbufs here so that we can serialise against I/O | |
1777 | * completion during unmount. We might be processing a shutdown | |
1778 | * triggered during unmount, and that can occur asynchronously to the | |
1779 | * unmount thread, and hence we need to ensure that completes before | |
1780 | * tearing down the iclogbufs. Hence we need to hold the buffer lock | |
1781 | * across the log IO to archieve that. | |
1782 | */ | |
79b54d9b | 1783 | down(&iclog->ic_sema); |
1858bb0b | 1784 | if (unlikely(iclog->ic_state == XLOG_STATE_IOERROR)) { |
873ff550 CH |
1785 | /* |
1786 | * It would seem logical to return EIO here, but we rely on | |
1787 | * the log state machine to propagate I/O errors instead of | |
79b54d9b CH |
1788 | * doing it here. We kick of the state machine and unlock |
1789 | * the buffer manually, the code needs to be kept in sync | |
1790 | * with the I/O completion path. | |
873ff550 | 1791 | */ |
cd95cb96 | 1792 | xlog_state_done_syncing(iclog, true); |
79b54d9b | 1793 | up(&iclog->ic_sema); |
94860a30 | 1794 | return; |
873ff550 CH |
1795 | } |
1796 | ||
79b54d9b CH |
1797 | bio_init(&iclog->ic_bio, iclog->ic_bvec, howmany(count, PAGE_SIZE)); |
1798 | bio_set_dev(&iclog->ic_bio, log->l_targ->bt_bdev); | |
1799 | iclog->ic_bio.bi_iter.bi_sector = log->l_logBBstart + bno; | |
1800 | iclog->ic_bio.bi_end_io = xlog_bio_end_io; | |
1801 | iclog->ic_bio.bi_private = iclog; | |
1802 | iclog->ic_bio.bi_opf = REQ_OP_WRITE | REQ_META | REQ_SYNC | REQ_FUA; | |
1803 | if (need_flush) | |
1804 | iclog->ic_bio.bi_opf |= REQ_PREFLUSH; | |
1805 | ||
2c68a1df | 1806 | xlog_map_iclog_data(&iclog->ic_bio, iclog->ic_data, count); |
79b54d9b | 1807 | if (is_vmalloc_addr(iclog->ic_data)) |
2c68a1df | 1808 | flush_kernel_vmap_range(iclog->ic_data, count); |
79b54d9b CH |
1809 | |
1810 | /* | |
1811 | * If this log buffer would straddle the end of the log we will have | |
1812 | * to split it up into two bios, so that we can continue at the start. | |
1813 | */ | |
1814 | if (bno + BTOBB(count) > log->l_logBBsize) { | |
1815 | struct bio *split; | |
1816 | ||
1817 | split = bio_split(&iclog->ic_bio, log->l_logBBsize - bno, | |
1818 | GFP_NOIO, &fs_bio_set); | |
1819 | bio_chain(split, &iclog->ic_bio); | |
1820 | submit_bio(split); | |
1821 | ||
1822 | /* restart at logical offset zero for the remainder */ | |
1823 | iclog->ic_bio.bi_iter.bi_sector = log->l_logBBstart; | |
1824 | } | |
1825 | ||
1826 | submit_bio(&iclog->ic_bio); | |
873ff550 | 1827 | } |
1da177e4 | 1828 | |
56933848 CH |
1829 | /* |
1830 | * We need to bump cycle number for the part of the iclog that is | |
1831 | * written to the start of the log. Watch out for the header magic | |
1832 | * number case, though. | |
1833 | */ | |
79b54d9b | 1834 | static void |
56933848 CH |
1835 | xlog_split_iclog( |
1836 | struct xlog *log, | |
1837 | void *data, | |
1838 | uint64_t bno, | |
1839 | unsigned int count) | |
1840 | { | |
1841 | unsigned int split_offset = BBTOB(log->l_logBBsize - bno); | |
1842 | unsigned int i; | |
1843 | ||
1844 | for (i = split_offset; i < count; i += BBSIZE) { | |
1845 | uint32_t cycle = get_unaligned_be32(data + i); | |
1846 | ||
1847 | if (++cycle == XLOG_HEADER_MAGIC_NUM) | |
1848 | cycle++; | |
1849 | put_unaligned_be32(cycle, data + i); | |
1850 | } | |
56933848 CH |
1851 | } |
1852 | ||
db0a6faf CH |
1853 | static int |
1854 | xlog_calc_iclog_size( | |
1855 | struct xlog *log, | |
1856 | struct xlog_in_core *iclog, | |
1857 | uint32_t *roundoff) | |
1858 | { | |
1859 | uint32_t count_init, count; | |
1860 | bool use_lsunit; | |
1861 | ||
1862 | use_lsunit = xfs_sb_version_haslogv2(&log->l_mp->m_sb) && | |
1863 | log->l_mp->m_sb.sb_logsunit > 1; | |
1864 | ||
1865 | /* Add for LR header */ | |
1866 | count_init = log->l_iclog_hsize + iclog->ic_offset; | |
1867 | ||
1868 | /* Round out the log write size */ | |
1869 | if (use_lsunit) { | |
1870 | /* we have a v2 stripe unit to use */ | |
1871 | count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); | |
1872 | } else { | |
1873 | count = BBTOB(BTOBB(count_init)); | |
1874 | } | |
1875 | ||
1876 | ASSERT(count >= count_init); | |
1877 | *roundoff = count - count_init; | |
1878 | ||
1879 | if (use_lsunit) | |
1880 | ASSERT(*roundoff < log->l_mp->m_sb.sb_logsunit); | |
1881 | else | |
1882 | ASSERT(*roundoff < BBTOB(1)); | |
1883 | return count; | |
1884 | } | |
1885 | ||
1da177e4 LT |
1886 | /* |
1887 | * Flush out the in-core log (iclog) to the on-disk log in an asynchronous | |
1888 | * fashion. Previously, we should have moved the current iclog | |
1889 | * ptr in the log to point to the next available iclog. This allows further | |
1890 | * write to continue while this code syncs out an iclog ready to go. | |
1891 | * Before an in-core log can be written out, the data section must be scanned | |
1892 | * to save away the 1st word of each BBSIZE block into the header. We replace | |
1893 | * it with the current cycle count. Each BBSIZE block is tagged with the | |
1894 | * cycle count because there in an implicit assumption that drives will | |
1895 | * guarantee that entire 512 byte blocks get written at once. In other words, | |
1896 | * we can't have part of a 512 byte block written and part not written. By | |
1897 | * tagging each block, we will know which blocks are valid when recovering | |
1898 | * after an unclean shutdown. | |
1899 | * | |
1900 | * This routine is single threaded on the iclog. No other thread can be in | |
1901 | * this routine with the same iclog. Changing contents of iclog can there- | |
1902 | * fore be done without grabbing the state machine lock. Updating the global | |
1903 | * log will require grabbing the lock though. | |
1904 | * | |
1905 | * The entire log manager uses a logical block numbering scheme. Only | |
94860a30 CH |
1906 | * xlog_write_iclog knows about the fact that the log may not start with |
1907 | * block zero on a given device. | |
1da177e4 | 1908 | */ |
94860a30 | 1909 | STATIC void |
9a8d2fdb MT |
1910 | xlog_sync( |
1911 | struct xlog *log, | |
1912 | struct xlog_in_core *iclog) | |
1da177e4 | 1913 | { |
db0a6faf CH |
1914 | unsigned int count; /* byte count of bwrite */ |
1915 | unsigned int roundoff; /* roundoff to BB or stripe */ | |
1916 | uint64_t bno; | |
db0a6faf | 1917 | unsigned int size; |
79b54d9b | 1918 | bool need_flush = true, split = false; |
1da177e4 | 1919 | |
155cc6b7 | 1920 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 | 1921 | |
db0a6faf | 1922 | count = xlog_calc_iclog_size(log, iclog, &roundoff); |
1da177e4 LT |
1923 | |
1924 | /* move grant heads by roundoff in sync */ | |
28496968 CH |
1925 | xlog_grant_add_space(log, &log->l_reserve_head.grant, roundoff); |
1926 | xlog_grant_add_space(log, &log->l_write_head.grant, roundoff); | |
1da177e4 LT |
1927 | |
1928 | /* put cycle number in every block */ | |
1929 | xlog_pack_data(log, iclog, roundoff); | |
1930 | ||
1931 | /* real byte length */ | |
0e446be4 | 1932 | size = iclog->ic_offset; |
db0a6faf | 1933 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) |
0e446be4 CH |
1934 | size += roundoff; |
1935 | iclog->ic_header.h_len = cpu_to_be32(size); | |
1da177e4 | 1936 | |
9b0489c1 | 1937 | XFS_STATS_INC(log->l_mp, xs_log_writes); |
ff6d6af2 | 1938 | XFS_STATS_ADD(log->l_mp, xs_log_blocks, BTOBB(count)); |
1da177e4 | 1939 | |
94860a30 CH |
1940 | bno = BLOCK_LSN(be64_to_cpu(iclog->ic_header.h_lsn)); |
1941 | ||
1da177e4 | 1942 | /* Do we need to split this write into 2 parts? */ |
79b54d9b CH |
1943 | if (bno + BTOBB(count) > log->l_logBBsize) { |
1944 | xlog_split_iclog(log, &iclog->ic_header, bno, count); | |
1945 | split = true; | |
1946 | } | |
0e446be4 CH |
1947 | |
1948 | /* calculcate the checksum */ | |
1949 | iclog->ic_header.h_crc = xlog_cksum(log, &iclog->ic_header, | |
1950 | iclog->ic_datap, size); | |
609adfc2 BF |
1951 | /* |
1952 | * Intentionally corrupt the log record CRC based on the error injection | |
1953 | * frequency, if defined. This facilitates testing log recovery in the | |
1954 | * event of torn writes. Hence, set the IOABORT state to abort the log | |
1955 | * write on I/O completion and shutdown the fs. The subsequent mount | |
1956 | * detects the bad CRC and attempts to recover. | |
1957 | */ | |
366fc4b8 | 1958 | #ifdef DEBUG |
3e88a007 | 1959 | if (XFS_TEST_ERROR(false, log->l_mp, XFS_ERRTAG_LOG_BAD_CRC)) { |
e2a64192 | 1960 | iclog->ic_header.h_crc &= cpu_to_le32(0xAAAAAAAA); |
366fc4b8 | 1961 | iclog->ic_fail_crc = true; |
609adfc2 BF |
1962 | xfs_warn(log->l_mp, |
1963 | "Intentionally corrupted log record at LSN 0x%llx. Shutdown imminent.", | |
1964 | be64_to_cpu(iclog->ic_header.h_lsn)); | |
1965 | } | |
366fc4b8 | 1966 | #endif |
0e446be4 | 1967 | |
2291dab2 DC |
1968 | /* |
1969 | * Flush the data device before flushing the log to make sure all meta | |
1970 | * data written back from the AIL actually made it to disk before | |
1971 | * stamping the new log tail LSN into the log buffer. For an external | |
1972 | * log we need to issue the flush explicitly, and unfortunately | |
1973 | * synchronously here; for an internal log we can simply use the block | |
1974 | * layer state machine for preflushes. | |
1975 | */ | |
2d15d2c0 | 1976 | if (log->l_targ != log->l_mp->m_ddev_targp || split) { |
2291dab2 | 1977 | xfs_blkdev_issue_flush(log->l_mp->m_ddev_targp); |
94860a30 CH |
1978 | need_flush = false; |
1979 | } | |
1da177e4 | 1980 | |
abca1f33 | 1981 | xlog_verify_iclog(log, iclog, count); |
79b54d9b | 1982 | xlog_write_iclog(log, iclog, bno, count, need_flush); |
94860a30 | 1983 | } |
1da177e4 | 1984 | |
1da177e4 | 1985 | /* |
c41564b5 | 1986 | * Deallocate a log structure |
1da177e4 | 1987 | */ |
a8272ce0 | 1988 | STATIC void |
9a8d2fdb MT |
1989 | xlog_dealloc_log( |
1990 | struct xlog *log) | |
1da177e4 LT |
1991 | { |
1992 | xlog_in_core_t *iclog, *next_iclog; | |
1da177e4 LT |
1993 | int i; |
1994 | ||
71e330b5 DC |
1995 | xlog_cil_destroy(log); |
1996 | ||
44396476 | 1997 | /* |
9c23eccc DC |
1998 | * Cycle all the iclogbuf locks to make sure all log IO completion |
1999 | * is done before we tear down these buffers. | |
2000 | */ | |
2001 | iclog = log->l_iclog; | |
2002 | for (i = 0; i < log->l_iclog_bufs; i++) { | |
79b54d9b CH |
2003 | down(&iclog->ic_sema); |
2004 | up(&iclog->ic_sema); | |
9c23eccc DC |
2005 | iclog = iclog->ic_next; |
2006 | } | |
2007 | ||
1da177e4 | 2008 | iclog = log->l_iclog; |
9c23eccc | 2009 | for (i = 0; i < log->l_iclog_bufs; i++) { |
1da177e4 | 2010 | next_iclog = iclog->ic_next; |
79b54d9b | 2011 | kmem_free(iclog->ic_data); |
f0e2d93c | 2012 | kmem_free(iclog); |
1da177e4 LT |
2013 | iclog = next_iclog; |
2014 | } | |
1da177e4 | 2015 | |
1da177e4 | 2016 | log->l_mp->m_log = NULL; |
1058d0f5 | 2017 | destroy_workqueue(log->l_ioend_workqueue); |
f0e2d93c | 2018 | kmem_free(log); |
c41564b5 | 2019 | } /* xlog_dealloc_log */ |
1da177e4 LT |
2020 | |
2021 | /* | |
2022 | * Update counters atomically now that memcpy is done. | |
2023 | */ | |
1da177e4 | 2024 | static inline void |
9a8d2fdb MT |
2025 | xlog_state_finish_copy( |
2026 | struct xlog *log, | |
2027 | struct xlog_in_core *iclog, | |
2028 | int record_cnt, | |
2029 | int copy_bytes) | |
1da177e4 | 2030 | { |
390aab0a | 2031 | lockdep_assert_held(&log->l_icloglock); |
1da177e4 | 2032 | |
413d57c9 | 2033 | be32_add_cpu(&iclog->ic_header.h_num_logops, record_cnt); |
1da177e4 | 2034 | iclog->ic_offset += copy_bytes; |
390aab0a | 2035 | } |
1da177e4 | 2036 | |
7e9c6396 TS |
2037 | /* |
2038 | * print out info relating to regions written which consume | |
2039 | * the reservation | |
2040 | */ | |
71e330b5 DC |
2041 | void |
2042 | xlog_print_tic_res( | |
2043 | struct xfs_mount *mp, | |
2044 | struct xlog_ticket *ticket) | |
7e9c6396 TS |
2045 | { |
2046 | uint i; | |
2047 | uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); | |
2048 | ||
2049 | /* match with XLOG_REG_TYPE_* in xfs_log.h */ | |
5110cd82 | 2050 | #define REG_TYPE_STR(type, str) [XLOG_REG_TYPE_##type] = str |
d31d7185 | 2051 | static char *res_type_str[] = { |
5110cd82 DW |
2052 | REG_TYPE_STR(BFORMAT, "bformat"), |
2053 | REG_TYPE_STR(BCHUNK, "bchunk"), | |
2054 | REG_TYPE_STR(EFI_FORMAT, "efi_format"), | |
2055 | REG_TYPE_STR(EFD_FORMAT, "efd_format"), | |
2056 | REG_TYPE_STR(IFORMAT, "iformat"), | |
2057 | REG_TYPE_STR(ICORE, "icore"), | |
2058 | REG_TYPE_STR(IEXT, "iext"), | |
2059 | REG_TYPE_STR(IBROOT, "ibroot"), | |
2060 | REG_TYPE_STR(ILOCAL, "ilocal"), | |
2061 | REG_TYPE_STR(IATTR_EXT, "iattr_ext"), | |
2062 | REG_TYPE_STR(IATTR_BROOT, "iattr_broot"), | |
2063 | REG_TYPE_STR(IATTR_LOCAL, "iattr_local"), | |
2064 | REG_TYPE_STR(QFORMAT, "qformat"), | |
2065 | REG_TYPE_STR(DQUOT, "dquot"), | |
2066 | REG_TYPE_STR(QUOTAOFF, "quotaoff"), | |
2067 | REG_TYPE_STR(LRHEADER, "LR header"), | |
2068 | REG_TYPE_STR(UNMOUNT, "unmount"), | |
2069 | REG_TYPE_STR(COMMIT, "commit"), | |
2070 | REG_TYPE_STR(TRANSHDR, "trans header"), | |
d31d7185 DW |
2071 | REG_TYPE_STR(ICREATE, "inode create"), |
2072 | REG_TYPE_STR(RUI_FORMAT, "rui_format"), | |
2073 | REG_TYPE_STR(RUD_FORMAT, "rud_format"), | |
2074 | REG_TYPE_STR(CUI_FORMAT, "cui_format"), | |
2075 | REG_TYPE_STR(CUD_FORMAT, "cud_format"), | |
2076 | REG_TYPE_STR(BUI_FORMAT, "bui_format"), | |
2077 | REG_TYPE_STR(BUD_FORMAT, "bud_format"), | |
7e9c6396 | 2078 | }; |
d31d7185 | 2079 | BUILD_BUG_ON(ARRAY_SIZE(res_type_str) != XLOG_REG_TYPE_MAX + 1); |
5110cd82 | 2080 | #undef REG_TYPE_STR |
7e9c6396 | 2081 | |
7d2d5653 | 2082 | xfs_warn(mp, "ticket reservation summary:"); |
f41febd2 JP |
2083 | xfs_warn(mp, " unit res = %d bytes", |
2084 | ticket->t_unit_res); | |
2085 | xfs_warn(mp, " current res = %d bytes", | |
2086 | ticket->t_curr_res); | |
2087 | xfs_warn(mp, " total reg = %u bytes (o/flow = %u bytes)", | |
2088 | ticket->t_res_arr_sum, ticket->t_res_o_flow); | |
2089 | xfs_warn(mp, " ophdrs = %u (ophdr space = %u bytes)", | |
2090 | ticket->t_res_num_ophdrs, ophdr_spc); | |
2091 | xfs_warn(mp, " ophdr + reg = %u bytes", | |
2092 | ticket->t_res_arr_sum + ticket->t_res_o_flow + ophdr_spc); | |
2093 | xfs_warn(mp, " num regions = %u", | |
2094 | ticket->t_res_num); | |
7e9c6396 TS |
2095 | |
2096 | for (i = 0; i < ticket->t_res_num; i++) { | |
a0fa2b67 | 2097 | uint r_type = ticket->t_res_arr[i].r_type; |
08e96e1a | 2098 | xfs_warn(mp, "region[%u]: %s - %u bytes", i, |
7e9c6396 | 2099 | ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ? |
5110cd82 | 2100 | "bad-rtype" : res_type_str[r_type]), |
7e9c6396 TS |
2101 | ticket->t_res_arr[i].r_len); |
2102 | } | |
2103 | } | |
7e9c6396 | 2104 | |
d4ca1d55 BF |
2105 | /* |
2106 | * Print a summary of the transaction. | |
2107 | */ | |
2108 | void | |
2109 | xlog_print_trans( | |
e6631f85 | 2110 | struct xfs_trans *tp) |
d4ca1d55 | 2111 | { |
e6631f85 DC |
2112 | struct xfs_mount *mp = tp->t_mountp; |
2113 | struct xfs_log_item *lip; | |
d4ca1d55 BF |
2114 | |
2115 | /* dump core transaction and ticket info */ | |
2116 | xfs_warn(mp, "transaction summary:"); | |
2c8f6265 BF |
2117 | xfs_warn(mp, " log res = %d", tp->t_log_res); |
2118 | xfs_warn(mp, " log count = %d", tp->t_log_count); | |
2119 | xfs_warn(mp, " flags = 0x%x", tp->t_flags); | |
d4ca1d55 BF |
2120 | |
2121 | xlog_print_tic_res(mp, tp->t_ticket); | |
2122 | ||
2123 | /* dump each log item */ | |
e6631f85 | 2124 | list_for_each_entry(lip, &tp->t_items, li_trans) { |
d4ca1d55 BF |
2125 | struct xfs_log_vec *lv = lip->li_lv; |
2126 | struct xfs_log_iovec *vec; | |
2127 | int i; | |
2128 | ||
2129 | xfs_warn(mp, "log item: "); | |
2130 | xfs_warn(mp, " type = 0x%x", lip->li_type); | |
22525c17 | 2131 | xfs_warn(mp, " flags = 0x%lx", lip->li_flags); |
d4ca1d55 BF |
2132 | if (!lv) |
2133 | continue; | |
2134 | xfs_warn(mp, " niovecs = %d", lv->lv_niovecs); | |
2135 | xfs_warn(mp, " size = %d", lv->lv_size); | |
2136 | xfs_warn(mp, " bytes = %d", lv->lv_bytes); | |
2137 | xfs_warn(mp, " buf len = %d", lv->lv_buf_len); | |
2138 | ||
2139 | /* dump each iovec for the log item */ | |
2140 | vec = lv->lv_iovecp; | |
2141 | for (i = 0; i < lv->lv_niovecs; i++) { | |
2142 | int dumplen = min(vec->i_len, 32); | |
2143 | ||
2144 | xfs_warn(mp, " iovec[%d]", i); | |
2145 | xfs_warn(mp, " type = 0x%x", vec->i_type); | |
2146 | xfs_warn(mp, " len = %d", vec->i_len); | |
2147 | xfs_warn(mp, " first %d bytes of iovec[%d]:", dumplen, i); | |
244e3dea | 2148 | xfs_hex_dump(vec->i_addr, dumplen); |
d4ca1d55 BF |
2149 | |
2150 | vec++; | |
2151 | } | |
2152 | } | |
2153 | } | |
2154 | ||
b5203cd0 DC |
2155 | /* |
2156 | * Calculate the potential space needed by the log vector. Each region gets | |
2157 | * its own xlog_op_header_t and may need to be double word aligned. | |
2158 | */ | |
2159 | static int | |
2160 | xlog_write_calc_vec_length( | |
2161 | struct xlog_ticket *ticket, | |
55b66332 | 2162 | struct xfs_log_vec *log_vector) |
b5203cd0 | 2163 | { |
55b66332 | 2164 | struct xfs_log_vec *lv; |
b5203cd0 DC |
2165 | int headers = 0; |
2166 | int len = 0; | |
2167 | int i; | |
2168 | ||
2169 | /* acct for start rec of xact */ | |
2170 | if (ticket->t_flags & XLOG_TIC_INITED) | |
2171 | headers++; | |
2172 | ||
55b66332 | 2173 | for (lv = log_vector; lv; lv = lv->lv_next) { |
fd63875c DC |
2174 | /* we don't write ordered log vectors */ |
2175 | if (lv->lv_buf_len == XFS_LOG_VEC_ORDERED) | |
2176 | continue; | |
2177 | ||
55b66332 DC |
2178 | headers += lv->lv_niovecs; |
2179 | ||
2180 | for (i = 0; i < lv->lv_niovecs; i++) { | |
2181 | struct xfs_log_iovec *vecp = &lv->lv_iovecp[i]; | |
b5203cd0 | 2182 | |
55b66332 DC |
2183 | len += vecp->i_len; |
2184 | xlog_tic_add_region(ticket, vecp->i_len, vecp->i_type); | |
2185 | } | |
b5203cd0 DC |
2186 | } |
2187 | ||
2188 | ticket->t_res_num_ophdrs += headers; | |
2189 | len += headers * sizeof(struct xlog_op_header); | |
2190 | ||
2191 | return len; | |
2192 | } | |
2193 | ||
2194 | /* | |
2195 | * If first write for transaction, insert start record We can't be trying to | |
2196 | * commit if we are inited. We can't have any "partial_copy" if we are inited. | |
2197 | */ | |
2198 | static int | |
2199 | xlog_write_start_rec( | |
e6b1f273 | 2200 | struct xlog_op_header *ophdr, |
b5203cd0 DC |
2201 | struct xlog_ticket *ticket) |
2202 | { | |
b5203cd0 DC |
2203 | if (!(ticket->t_flags & XLOG_TIC_INITED)) |
2204 | return 0; | |
2205 | ||
2206 | ophdr->oh_tid = cpu_to_be32(ticket->t_tid); | |
2207 | ophdr->oh_clientid = ticket->t_clientid; | |
2208 | ophdr->oh_len = 0; | |
2209 | ophdr->oh_flags = XLOG_START_TRANS; | |
2210 | ophdr->oh_res2 = 0; | |
2211 | ||
2212 | ticket->t_flags &= ~XLOG_TIC_INITED; | |
2213 | ||
2214 | return sizeof(struct xlog_op_header); | |
2215 | } | |
2216 | ||
2217 | static xlog_op_header_t * | |
2218 | xlog_write_setup_ophdr( | |
ad223e60 | 2219 | struct xlog *log, |
e6b1f273 | 2220 | struct xlog_op_header *ophdr, |
b5203cd0 DC |
2221 | struct xlog_ticket *ticket, |
2222 | uint flags) | |
2223 | { | |
b5203cd0 DC |
2224 | ophdr->oh_tid = cpu_to_be32(ticket->t_tid); |
2225 | ophdr->oh_clientid = ticket->t_clientid; | |
2226 | ophdr->oh_res2 = 0; | |
2227 | ||
2228 | /* are we copying a commit or unmount record? */ | |
2229 | ophdr->oh_flags = flags; | |
2230 | ||
2231 | /* | |
2232 | * We've seen logs corrupted with bad transaction client ids. This | |
2233 | * makes sure that XFS doesn't generate them on. Turn this into an EIO | |
2234 | * and shut down the filesystem. | |
2235 | */ | |
2236 | switch (ophdr->oh_clientid) { | |
2237 | case XFS_TRANSACTION: | |
2238 | case XFS_VOLUME: | |
2239 | case XFS_LOG: | |
2240 | break; | |
2241 | default: | |
a0fa2b67 | 2242 | xfs_warn(log->l_mp, |
c9690043 | 2243 | "Bad XFS transaction clientid 0x%x in ticket "PTR_FMT, |
b5203cd0 DC |
2244 | ophdr->oh_clientid, ticket); |
2245 | return NULL; | |
2246 | } | |
2247 | ||
2248 | return ophdr; | |
2249 | } | |
2250 | ||
2251 | /* | |
2252 | * Set up the parameters of the region copy into the log. This has | |
2253 | * to handle region write split across multiple log buffers - this | |
2254 | * state is kept external to this function so that this code can | |
ac0e300f | 2255 | * be written in an obvious, self documenting manner. |
b5203cd0 DC |
2256 | */ |
2257 | static int | |
2258 | xlog_write_setup_copy( | |
2259 | struct xlog_ticket *ticket, | |
2260 | struct xlog_op_header *ophdr, | |
2261 | int space_available, | |
2262 | int space_required, | |
2263 | int *copy_off, | |
2264 | int *copy_len, | |
2265 | int *last_was_partial_copy, | |
2266 | int *bytes_consumed) | |
2267 | { | |
2268 | int still_to_copy; | |
2269 | ||
2270 | still_to_copy = space_required - *bytes_consumed; | |
2271 | *copy_off = *bytes_consumed; | |
2272 | ||
2273 | if (still_to_copy <= space_available) { | |
2274 | /* write of region completes here */ | |
2275 | *copy_len = still_to_copy; | |
2276 | ophdr->oh_len = cpu_to_be32(*copy_len); | |
2277 | if (*last_was_partial_copy) | |
2278 | ophdr->oh_flags |= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); | |
2279 | *last_was_partial_copy = 0; | |
2280 | *bytes_consumed = 0; | |
2281 | return 0; | |
2282 | } | |
2283 | ||
2284 | /* partial write of region, needs extra log op header reservation */ | |
2285 | *copy_len = space_available; | |
2286 | ophdr->oh_len = cpu_to_be32(*copy_len); | |
2287 | ophdr->oh_flags |= XLOG_CONTINUE_TRANS; | |
2288 | if (*last_was_partial_copy) | |
2289 | ophdr->oh_flags |= XLOG_WAS_CONT_TRANS; | |
2290 | *bytes_consumed += *copy_len; | |
2291 | (*last_was_partial_copy)++; | |
2292 | ||
2293 | /* account for new log op header */ | |
2294 | ticket->t_curr_res -= sizeof(struct xlog_op_header); | |
2295 | ticket->t_res_num_ophdrs++; | |
2296 | ||
2297 | return sizeof(struct xlog_op_header); | |
2298 | } | |
2299 | ||
2300 | static int | |
2301 | xlog_write_copy_finish( | |
ad223e60 | 2302 | struct xlog *log, |
b5203cd0 DC |
2303 | struct xlog_in_core *iclog, |
2304 | uint flags, | |
2305 | int *record_cnt, | |
2306 | int *data_cnt, | |
2307 | int *partial_copy, | |
2308 | int *partial_copy_len, | |
2309 | int log_offset, | |
2310 | struct xlog_in_core **commit_iclog) | |
2311 | { | |
df732b29 CH |
2312 | int error; |
2313 | ||
b5203cd0 DC |
2314 | if (*partial_copy) { |
2315 | /* | |
2316 | * This iclog has already been marked WANT_SYNC by | |
2317 | * xlog_state_get_iclog_space. | |
2318 | */ | |
390aab0a | 2319 | spin_lock(&log->l_icloglock); |
b5203cd0 DC |
2320 | xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt); |
2321 | *record_cnt = 0; | |
2322 | *data_cnt = 0; | |
df732b29 | 2323 | goto release_iclog; |
b5203cd0 DC |
2324 | } |
2325 | ||
2326 | *partial_copy = 0; | |
2327 | *partial_copy_len = 0; | |
2328 | ||
2329 | if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { | |
2330 | /* no more space in this iclog - push it. */ | |
390aab0a | 2331 | spin_lock(&log->l_icloglock); |
b5203cd0 DC |
2332 | xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt); |
2333 | *record_cnt = 0; | |
2334 | *data_cnt = 0; | |
2335 | ||
b5203cd0 | 2336 | xlog_state_want_sync(log, iclog); |
b5203cd0 | 2337 | if (!commit_iclog) |
df732b29 CH |
2338 | goto release_iclog; |
2339 | spin_unlock(&log->l_icloglock); | |
b5203cd0 DC |
2340 | ASSERT(flags & XLOG_COMMIT_TRANS); |
2341 | *commit_iclog = iclog; | |
2342 | } | |
2343 | ||
2344 | return 0; | |
df732b29 CH |
2345 | |
2346 | release_iclog: | |
2347 | error = xlog_state_release_iclog(log, iclog); | |
2348 | spin_unlock(&log->l_icloglock); | |
2349 | return error; | |
b5203cd0 DC |
2350 | } |
2351 | ||
1da177e4 LT |
2352 | /* |
2353 | * Write some region out to in-core log | |
2354 | * | |
2355 | * This will be called when writing externally provided regions or when | |
2356 | * writing out a commit record for a given transaction. | |
2357 | * | |
2358 | * General algorithm: | |
2359 | * 1. Find total length of this write. This may include adding to the | |
2360 | * lengths passed in. | |
2361 | * 2. Check whether we violate the tickets reservation. | |
2362 | * 3. While writing to this iclog | |
2363 | * A. Reserve as much space in this iclog as can get | |
2364 | * B. If this is first write, save away start lsn | |
2365 | * C. While writing this region: | |
2366 | * 1. If first write of transaction, write start record | |
2367 | * 2. Write log operation header (header per region) | |
2368 | * 3. Find out if we can fit entire region into this iclog | |
2369 | * 4. Potentially, verify destination memcpy ptr | |
2370 | * 5. Memcpy (partial) region | |
2371 | * 6. If partial copy, release iclog; otherwise, continue | |
2372 | * copying more regions into current iclog | |
2373 | * 4. Mark want sync bit (in simulation mode) | |
2374 | * 5. Release iclog for potential flush to on-disk log. | |
2375 | * | |
2376 | * ERRORS: | |
2377 | * 1. Panic if reservation is overrun. This should never happen since | |
2378 | * reservation amounts are generated internal to the filesystem. | |
2379 | * NOTES: | |
2380 | * 1. Tickets are single threaded data structures. | |
2381 | * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the | |
2382 | * syncing routine. When a single log_write region needs to span | |
2383 | * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set | |
2384 | * on all log operation writes which don't contain the end of the | |
2385 | * region. The XLOG_END_TRANS bit is used for the in-core log | |
2386 | * operation which contains the end of the continued log_write region. | |
2387 | * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog, | |
2388 | * we don't really know exactly how much space will be used. As a result, | |
2389 | * we don't update ic_offset until the end when we know exactly how many | |
2390 | * bytes have been written out. | |
2391 | */ | |
71e330b5 | 2392 | int |
35a8a72f | 2393 | xlog_write( |
ad223e60 | 2394 | struct xlog *log, |
55b66332 | 2395 | struct xfs_log_vec *log_vector, |
35a8a72f CH |
2396 | struct xlog_ticket *ticket, |
2397 | xfs_lsn_t *start_lsn, | |
2398 | struct xlog_in_core **commit_iclog, | |
2399 | uint flags) | |
1da177e4 | 2400 | { |
99428ad0 | 2401 | struct xlog_in_core *iclog = NULL; |
55b66332 DC |
2402 | struct xfs_log_iovec *vecp; |
2403 | struct xfs_log_vec *lv; | |
99428ad0 CH |
2404 | int len; |
2405 | int index; | |
2406 | int partial_copy = 0; | |
2407 | int partial_copy_len = 0; | |
2408 | int contwr = 0; | |
2409 | int record_cnt = 0; | |
2410 | int data_cnt = 0; | |
df732b29 | 2411 | int error = 0; |
99428ad0 CH |
2412 | |
2413 | *start_lsn = 0; | |
2414 | ||
55b66332 | 2415 | len = xlog_write_calc_vec_length(ticket, log_vector); |
71e330b5 | 2416 | |
93b8a585 CH |
2417 | /* |
2418 | * Region headers and bytes are already accounted for. | |
2419 | * We only need to take into account start records and | |
2420 | * split regions in this function. | |
2421 | */ | |
2422 | if (ticket->t_flags & XLOG_TIC_INITED) | |
2423 | ticket->t_curr_res -= sizeof(xlog_op_header_t); | |
2424 | ||
2425 | /* | |
2426 | * Commit record headers need to be accounted for. These | |
2427 | * come in as separate writes so are easy to detect. | |
2428 | */ | |
2429 | if (flags & (XLOG_COMMIT_TRANS | XLOG_UNMOUNT_TRANS)) | |
2430 | ticket->t_curr_res -= sizeof(xlog_op_header_t); | |
71e330b5 | 2431 | |
7d2d5653 BF |
2432 | if (ticket->t_curr_res < 0) { |
2433 | xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, | |
2434 | "ctx ticket reservation ran out. Need to up reservation"); | |
55b66332 | 2435 | xlog_print_tic_res(log->l_mp, ticket); |
7d2d5653 BF |
2436 | xfs_force_shutdown(log->l_mp, SHUTDOWN_LOG_IO_ERROR); |
2437 | } | |
1da177e4 | 2438 | |
55b66332 DC |
2439 | index = 0; |
2440 | lv = log_vector; | |
2441 | vecp = lv->lv_iovecp; | |
fd63875c | 2442 | while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) { |
e6b1f273 | 2443 | void *ptr; |
99428ad0 | 2444 | int log_offset; |
1da177e4 | 2445 | |
99428ad0 CH |
2446 | error = xlog_state_get_iclog_space(log, len, &iclog, ticket, |
2447 | &contwr, &log_offset); | |
2448 | if (error) | |
2449 | return error; | |
1da177e4 | 2450 | |
99428ad0 | 2451 | ASSERT(log_offset <= iclog->ic_size - 1); |
e6b1f273 | 2452 | ptr = iclog->ic_datap + log_offset; |
1da177e4 | 2453 | |
99428ad0 CH |
2454 | /* start_lsn is the first lsn written to. That's all we need. */ |
2455 | if (!*start_lsn) | |
2456 | *start_lsn = be64_to_cpu(iclog->ic_header.h_lsn); | |
b5203cd0 | 2457 | |
99428ad0 CH |
2458 | /* |
2459 | * This loop writes out as many regions as can fit in the amount | |
2460 | * of space which was allocated by xlog_state_get_iclog_space(). | |
2461 | */ | |
fd63875c DC |
2462 | while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) { |
2463 | struct xfs_log_iovec *reg; | |
99428ad0 CH |
2464 | struct xlog_op_header *ophdr; |
2465 | int start_rec_copy; | |
2466 | int copy_len; | |
2467 | int copy_off; | |
fd63875c DC |
2468 | bool ordered = false; |
2469 | ||
2470 | /* ordered log vectors have no regions to write */ | |
2471 | if (lv->lv_buf_len == XFS_LOG_VEC_ORDERED) { | |
2472 | ASSERT(lv->lv_niovecs == 0); | |
2473 | ordered = true; | |
2474 | goto next_lv; | |
2475 | } | |
99428ad0 | 2476 | |
fd63875c | 2477 | reg = &vecp[index]; |
c8ce540d DW |
2478 | ASSERT(reg->i_len % sizeof(int32_t) == 0); |
2479 | ASSERT((unsigned long)ptr % sizeof(int32_t) == 0); | |
99428ad0 CH |
2480 | |
2481 | start_rec_copy = xlog_write_start_rec(ptr, ticket); | |
2482 | if (start_rec_copy) { | |
2483 | record_cnt++; | |
e6b1f273 | 2484 | xlog_write_adv_cnt(&ptr, &len, &log_offset, |
99428ad0 CH |
2485 | start_rec_copy); |
2486 | } | |
b5203cd0 | 2487 | |
99428ad0 CH |
2488 | ophdr = xlog_write_setup_ophdr(log, ptr, ticket, flags); |
2489 | if (!ophdr) | |
2451337d | 2490 | return -EIO; |
99428ad0 | 2491 | |
e6b1f273 | 2492 | xlog_write_adv_cnt(&ptr, &len, &log_offset, |
99428ad0 CH |
2493 | sizeof(struct xlog_op_header)); |
2494 | ||
2495 | len += xlog_write_setup_copy(ticket, ophdr, | |
2496 | iclog->ic_size-log_offset, | |
55b66332 | 2497 | reg->i_len, |
99428ad0 CH |
2498 | ©_off, ©_len, |
2499 | &partial_copy, | |
2500 | &partial_copy_len); | |
2501 | xlog_verify_dest_ptr(log, ptr); | |
2502 | ||
91f9f5fe ES |
2503 | /* |
2504 | * Copy region. | |
2505 | * | |
2506 | * Unmount records just log an opheader, so can have | |
2507 | * empty payloads with no data region to copy. Hence we | |
2508 | * only copy the payload if the vector says it has data | |
2509 | * to copy. | |
2510 | */ | |
99428ad0 | 2511 | ASSERT(copy_len >= 0); |
91f9f5fe ES |
2512 | if (copy_len > 0) { |
2513 | memcpy(ptr, reg->i_addr + copy_off, copy_len); | |
2514 | xlog_write_adv_cnt(&ptr, &len, &log_offset, | |
2515 | copy_len); | |
2516 | } | |
99428ad0 CH |
2517 | copy_len += start_rec_copy + sizeof(xlog_op_header_t); |
2518 | record_cnt++; | |
2519 | data_cnt += contwr ? copy_len : 0; | |
2520 | ||
2521 | error = xlog_write_copy_finish(log, iclog, flags, | |
2522 | &record_cnt, &data_cnt, | |
2523 | &partial_copy, | |
2524 | &partial_copy_len, | |
2525 | log_offset, | |
2526 | commit_iclog); | |
2527 | if (error) | |
2528 | return error; | |
2529 | ||
2530 | /* | |
2531 | * if we had a partial copy, we need to get more iclog | |
2532 | * space but we don't want to increment the region | |
2533 | * index because there is still more is this region to | |
2534 | * write. | |
2535 | * | |
2536 | * If we completed writing this region, and we flushed | |
2537 | * the iclog (indicated by resetting of the record | |
2538 | * count), then we also need to get more log space. If | |
2539 | * this was the last record, though, we are done and | |
2540 | * can just return. | |
2541 | */ | |
2542 | if (partial_copy) | |
2543 | break; | |
2544 | ||
55b66332 | 2545 | if (++index == lv->lv_niovecs) { |
fd63875c | 2546 | next_lv: |
55b66332 DC |
2547 | lv = lv->lv_next; |
2548 | index = 0; | |
2549 | if (lv) | |
2550 | vecp = lv->lv_iovecp; | |
2551 | } | |
749f24f3 | 2552 | if (record_cnt == 0 && !ordered) { |
55b66332 | 2553 | if (!lv) |
99428ad0 CH |
2554 | return 0; |
2555 | break; | |
2556 | } | |
2557 | } | |
2558 | } | |
2559 | ||
2560 | ASSERT(len == 0); | |
2561 | ||
390aab0a | 2562 | spin_lock(&log->l_icloglock); |
99428ad0 | 2563 | xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); |
df732b29 CH |
2564 | if (commit_iclog) { |
2565 | ASSERT(flags & XLOG_COMMIT_TRANS); | |
2566 | *commit_iclog = iclog; | |
2567 | } else { | |
2568 | error = xlog_state_release_iclog(log, iclog); | |
2569 | } | |
390aab0a | 2570 | spin_unlock(&log->l_icloglock); |
1da177e4 | 2571 | |
df732b29 | 2572 | return error; |
99428ad0 | 2573 | } |
1da177e4 LT |
2574 | |
2575 | ||
2576 | /***************************************************************************** | |
2577 | * | |
2578 | * State Machine functions | |
2579 | * | |
2580 | ***************************************************************************** | |
2581 | */ | |
2582 | ||
0383f543 DC |
2583 | /* |
2584 | * An iclog has just finished IO completion processing, so we need to update | |
2585 | * the iclog state and propagate that up into the overall log state. Hence we | |
2586 | * prepare the iclog for cleaning, and then clean all the pending dirty iclogs | |
2587 | * starting from the head, and then wake up any threads that are waiting for the | |
2588 | * iclog to be marked clean. | |
2589 | * | |
2590 | * The ordering of marking iclogs ACTIVE must be maintained, so an iclog | |
2591 | * doesn't become ACTIVE beyond one that is SYNCING. This is also required to | |
2592 | * maintain the notion that we use a ordered wait queue to hold off would be | |
2593 | * writers to the log when every iclog is trying to sync to disk. | |
1da177e4 | 2594 | * |
0383f543 DC |
2595 | * Caller must hold the icloglock before calling us. |
2596 | * | |
2597 | * State Change: !IOERROR -> DIRTY -> ACTIVE | |
1da177e4 | 2598 | */ |
ba0f32d4 | 2599 | STATIC void |
0383f543 DC |
2600 | xlog_state_clean_iclog( |
2601 | struct xlog *log, | |
2602 | struct xlog_in_core *dirty_iclog) | |
1da177e4 | 2603 | { |
0383f543 DC |
2604 | struct xlog_in_core *iclog; |
2605 | int changed = 0; | |
2606 | ||
2607 | /* Prepare the completed iclog. */ | |
1858bb0b | 2608 | if (dirty_iclog->ic_state != XLOG_STATE_IOERROR) |
0383f543 | 2609 | dirty_iclog->ic_state = XLOG_STATE_DIRTY; |
1da177e4 | 2610 | |
0383f543 | 2611 | /* Walk all the iclogs to update the ordered active state. */ |
1da177e4 LT |
2612 | iclog = log->l_iclog; |
2613 | do { | |
2614 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
2615 | iclog->ic_state = XLOG_STATE_ACTIVE; | |
2616 | iclog->ic_offset = 0; | |
89ae379d | 2617 | ASSERT(list_empty_careful(&iclog->ic_callbacks)); |
1da177e4 LT |
2618 | /* |
2619 | * If the number of ops in this iclog indicate it just | |
2620 | * contains the dummy transaction, we can | |
2621 | * change state into IDLE (the second time around). | |
2622 | * Otherwise we should change the state into | |
2623 | * NEED a dummy. | |
2624 | * We don't need to cover the dummy. | |
2625 | */ | |
2626 | if (!changed && | |
b53e675d CH |
2627 | (be32_to_cpu(iclog->ic_header.h_num_logops) == |
2628 | XLOG_COVER_OPS)) { | |
1da177e4 LT |
2629 | changed = 1; |
2630 | } else { | |
2631 | /* | |
2632 | * We have two dirty iclogs so start over | |
2633 | * This could also be num of ops indicates | |
2634 | * this is not the dummy going out. | |
2635 | */ | |
2636 | changed = 2; | |
2637 | } | |
2638 | iclog->ic_header.h_num_logops = 0; | |
2639 | memset(iclog->ic_header.h_cycle_data, 0, | |
2640 | sizeof(iclog->ic_header.h_cycle_data)); | |
2641 | iclog->ic_header.h_lsn = 0; | |
2642 | } else if (iclog->ic_state == XLOG_STATE_ACTIVE) | |
2643 | /* do nothing */; | |
2644 | else | |
2645 | break; /* stop cleaning */ | |
2646 | iclog = iclog->ic_next; | |
2647 | } while (iclog != log->l_iclog); | |
2648 | ||
0383f543 DC |
2649 | |
2650 | /* | |
2651 | * Wake up threads waiting in xfs_log_force() for the dirty iclog | |
2652 | * to be cleaned. | |
2653 | */ | |
2654 | wake_up_all(&dirty_iclog->ic_force_wait); | |
2655 | ||
1da177e4 LT |
2656 | /* |
2657 | * Change state for the dummy log recording. | |
2658 | * We usually go to NEED. But we go to NEED2 if the changed indicates | |
2659 | * we are done writing the dummy record. | |
2660 | * If we are done with the second dummy recored (DONE2), then | |
2661 | * we go to IDLE. | |
2662 | */ | |
2663 | if (changed) { | |
2664 | switch (log->l_covered_state) { | |
2665 | case XLOG_STATE_COVER_IDLE: | |
2666 | case XLOG_STATE_COVER_NEED: | |
2667 | case XLOG_STATE_COVER_NEED2: | |
2668 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2669 | break; | |
2670 | ||
2671 | case XLOG_STATE_COVER_DONE: | |
2672 | if (changed == 1) | |
2673 | log->l_covered_state = XLOG_STATE_COVER_NEED2; | |
2674 | else | |
2675 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2676 | break; | |
2677 | ||
2678 | case XLOG_STATE_COVER_DONE2: | |
2679 | if (changed == 1) | |
2680 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
2681 | else | |
2682 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2683 | break; | |
2684 | ||
2685 | default: | |
2686 | ASSERT(0); | |
2687 | } | |
2688 | } | |
0383f543 | 2689 | } |
1da177e4 LT |
2690 | |
2691 | STATIC xfs_lsn_t | |
2692 | xlog_get_lowest_lsn( | |
9bff3132 | 2693 | struct xlog *log) |
1da177e4 | 2694 | { |
9bff3132 CH |
2695 | struct xlog_in_core *iclog = log->l_iclog; |
2696 | xfs_lsn_t lowest_lsn = 0, lsn; | |
1da177e4 | 2697 | |
1da177e4 | 2698 | do { |
1858bb0b CH |
2699 | if (iclog->ic_state == XLOG_STATE_ACTIVE || |
2700 | iclog->ic_state == XLOG_STATE_DIRTY) | |
9bff3132 CH |
2701 | continue; |
2702 | ||
2703 | lsn = be64_to_cpu(iclog->ic_header.h_lsn); | |
2704 | if ((lsn && !lowest_lsn) || XFS_LSN_CMP(lsn, lowest_lsn) < 0) | |
1da177e4 | 2705 | lowest_lsn = lsn; |
9bff3132 CH |
2706 | } while ((iclog = iclog->ic_next) != log->l_iclog); |
2707 | ||
014c2544 | 2708 | return lowest_lsn; |
1da177e4 LT |
2709 | } |
2710 | ||
14e15f1b DC |
2711 | /* |
2712 | * Completion of a iclog IO does not imply that a transaction has completed, as | |
2713 | * transactions can be large enough to span many iclogs. We cannot change the | |
2714 | * tail of the log half way through a transaction as this may be the only | |
2715 | * transaction in the log and moving the tail to point to the middle of it | |
2716 | * will prevent recovery from finding the start of the transaction. Hence we | |
2717 | * should only update the last_sync_lsn if this iclog contains transaction | |
2718 | * completion callbacks on it. | |
2719 | * | |
2720 | * We have to do this before we drop the icloglock to ensure we are the only one | |
2721 | * that can update it. | |
2722 | * | |
2723 | * If we are moving the last_sync_lsn forwards, we also need to ensure we kick | |
2724 | * the reservation grant head pushing. This is due to the fact that the push | |
2725 | * target is bound by the current last_sync_lsn value. Hence if we have a large | |
2726 | * amount of log space bound up in this committing transaction then the | |
2727 | * last_sync_lsn value may be the limiting factor preventing tail pushing from | |
2728 | * freeing space in the log. Hence once we've updated the last_sync_lsn we | |
2729 | * should push the AIL to ensure the push target (and hence the grant head) is | |
2730 | * no longer bound by the old log head location and can move forwards and make | |
2731 | * progress again. | |
2732 | */ | |
2733 | static void | |
2734 | xlog_state_set_callback( | |
2735 | struct xlog *log, | |
2736 | struct xlog_in_core *iclog, | |
2737 | xfs_lsn_t header_lsn) | |
2738 | { | |
2739 | iclog->ic_state = XLOG_STATE_CALLBACK; | |
2740 | ||
2741 | ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn), | |
2742 | header_lsn) <= 0); | |
2743 | ||
2744 | if (list_empty_careful(&iclog->ic_callbacks)) | |
2745 | return; | |
2746 | ||
2747 | atomic64_set(&log->l_last_sync_lsn, header_lsn); | |
2748 | xlog_grant_push_ail(log, 0); | |
2749 | } | |
2750 | ||
5e96fa8d DC |
2751 | /* |
2752 | * Return true if we need to stop processing, false to continue to the next | |
2753 | * iclog. The caller will need to run callbacks if the iclog is returned in the | |
2754 | * XLOG_STATE_CALLBACK state. | |
2755 | */ | |
2756 | static bool | |
2757 | xlog_state_iodone_process_iclog( | |
2758 | struct xlog *log, | |
2759 | struct xlog_in_core *iclog, | |
5e96fa8d DC |
2760 | bool *ioerror) |
2761 | { | |
2762 | xfs_lsn_t lowest_lsn; | |
14e15f1b | 2763 | xfs_lsn_t header_lsn; |
5e96fa8d | 2764 | |
1858bb0b CH |
2765 | switch (iclog->ic_state) { |
2766 | case XLOG_STATE_ACTIVE: | |
2767 | case XLOG_STATE_DIRTY: | |
2768 | /* | |
2769 | * Skip all iclogs in the ACTIVE & DIRTY states: | |
2770 | */ | |
5e96fa8d | 2771 | return false; |
1858bb0b CH |
2772 | case XLOG_STATE_IOERROR: |
2773 | /* | |
2774 | * Between marking a filesystem SHUTDOWN and stopping the log, | |
2775 | * we do flush all iclogs to disk (if there wasn't a log I/O | |
2776 | * error). So, we do want things to go smoothly in case of just | |
4b29ab04 | 2777 | * a SHUTDOWN w/o a LOG_IO_ERROR. |
1858bb0b | 2778 | */ |
5e96fa8d DC |
2779 | *ioerror = true; |
2780 | return false; | |
1858bb0b | 2781 | case XLOG_STATE_DONE_SYNC: |
1858bb0b | 2782 | /* |
4b29ab04 CH |
2783 | * Now that we have an iclog that is in the DONE_SYNC state, do |
2784 | * one more check here to see if we have chased our tail around. | |
2785 | * If this is not the lowest lsn iclog, then we will leave it | |
2786 | * for another completion to process. | |
1858bb0b CH |
2787 | */ |
2788 | header_lsn = be64_to_cpu(iclog->ic_header.h_lsn); | |
2789 | lowest_lsn = xlog_get_lowest_lsn(log); | |
2790 | if (lowest_lsn && XFS_LSN_CMP(lowest_lsn, header_lsn) < 0) | |
2791 | return false; | |
2792 | xlog_state_set_callback(log, iclog, header_lsn); | |
2793 | return false; | |
2794 | default: | |
2795 | /* | |
2796 | * Can only perform callbacks in order. Since this iclog is not | |
4b29ab04 CH |
2797 | * in the DONE_SYNC state, we skip the rest and just try to |
2798 | * clean up. | |
1858bb0b | 2799 | */ |
5e96fa8d DC |
2800 | return true; |
2801 | } | |
5e96fa8d DC |
2802 | } |
2803 | ||
6546818c DC |
2804 | /* |
2805 | * Keep processing entries in the iclog callback list until we come around and | |
2806 | * it is empty. We need to atomically see that the list is empty and change the | |
2807 | * state to DIRTY so that we don't miss any more callbacks being added. | |
2808 | * | |
2809 | * This function is called with the icloglock held and returns with it held. We | |
2810 | * drop it while running callbacks, however, as holding it over thousands of | |
2811 | * callbacks is unnecessary and causes excessive contention if we do. | |
2812 | */ | |
2813 | static void | |
2814 | xlog_state_do_iclog_callbacks( | |
2815 | struct xlog *log, | |
2816 | struct xlog_in_core *iclog, | |
2817 | bool aborted) | |
f7559793 DW |
2818 | __releases(&log->l_icloglock) |
2819 | __acquires(&log->l_icloglock) | |
6546818c DC |
2820 | { |
2821 | spin_unlock(&log->l_icloglock); | |
2822 | spin_lock(&iclog->ic_callback_lock); | |
2823 | while (!list_empty(&iclog->ic_callbacks)) { | |
2824 | LIST_HEAD(tmp); | |
2825 | ||
2826 | list_splice_init(&iclog->ic_callbacks, &tmp); | |
2827 | ||
2828 | spin_unlock(&iclog->ic_callback_lock); | |
2829 | xlog_cil_process_committed(&tmp, aborted); | |
2830 | spin_lock(&iclog->ic_callback_lock); | |
2831 | } | |
2832 | ||
2833 | /* | |
2834 | * Pick up the icloglock while still holding the callback lock so we | |
2835 | * serialise against anyone trying to add more callbacks to this iclog | |
2836 | * now we've finished processing. | |
2837 | */ | |
2838 | spin_lock(&log->l_icloglock); | |
2839 | spin_unlock(&iclog->ic_callback_lock); | |
2840 | } | |
2841 | ||
1da177e4 LT |
2842 | STATIC void |
2843 | xlog_state_do_callback( | |
9a8d2fdb | 2844 | struct xlog *log, |
4b29ab04 | 2845 | bool aborted) |
1da177e4 | 2846 | { |
5e96fa8d DC |
2847 | struct xlog_in_core *iclog; |
2848 | struct xlog_in_core *first_iclog; | |
5e96fa8d DC |
2849 | bool cycled_icloglock; |
2850 | bool ioerror; | |
2851 | int flushcnt = 0; | |
2852 | int repeats = 0; | |
1da177e4 | 2853 | |
b22cd72c | 2854 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2855 | do { |
2856 | /* | |
2857 | * Scan all iclogs starting with the one pointed to by the | |
2858 | * log. Reset this starting point each time the log is | |
2859 | * unlocked (during callbacks). | |
2860 | * | |
2861 | * Keep looping through iclogs until one full pass is made | |
2862 | * without running any callbacks. | |
2863 | */ | |
2864 | first_iclog = log->l_iclog; | |
2865 | iclog = log->l_iclog; | |
6546818c | 2866 | cycled_icloglock = false; |
5e96fa8d | 2867 | ioerror = false; |
1da177e4 LT |
2868 | repeats++; |
2869 | ||
2870 | do { | |
5e96fa8d | 2871 | if (xlog_state_iodone_process_iclog(log, iclog, |
4b29ab04 | 2872 | &ioerror)) |
5e96fa8d | 2873 | break; |
1da177e4 | 2874 | |
1858bb0b CH |
2875 | if (iclog->ic_state != XLOG_STATE_CALLBACK && |
2876 | iclog->ic_state != XLOG_STATE_IOERROR) { | |
1da177e4 LT |
2877 | iclog = iclog->ic_next; |
2878 | continue; | |
2879 | } | |
2880 | ||
114d23aa | 2881 | /* |
6546818c DC |
2882 | * Running callbacks will drop the icloglock which means |
2883 | * we'll have to run at least one more complete loop. | |
114d23aa | 2884 | */ |
6546818c DC |
2885 | cycled_icloglock = true; |
2886 | xlog_state_do_iclog_callbacks(log, iclog, aborted); | |
1da177e4 | 2887 | |
0383f543 | 2888 | xlog_state_clean_iclog(log, iclog); |
1da177e4 LT |
2889 | iclog = iclog->ic_next; |
2890 | } while (first_iclog != iclog); | |
a3c6685e NS |
2891 | |
2892 | if (repeats > 5000) { | |
2893 | flushcnt += repeats; | |
2894 | repeats = 0; | |
a0fa2b67 | 2895 | xfs_warn(log->l_mp, |
a3c6685e | 2896 | "%s: possible infinite loop (%d iterations)", |
34a622b2 | 2897 | __func__, flushcnt); |
1da177e4 | 2898 | } |
5e96fa8d | 2899 | } while (!ioerror && cycled_icloglock); |
1da177e4 | 2900 | |
1858bb0b CH |
2901 | if (log->l_iclog->ic_state == XLOG_STATE_ACTIVE || |
2902 | log->l_iclog->ic_state == XLOG_STATE_IOERROR) | |
eb40a875 | 2903 | wake_up_all(&log->l_flush_wait); |
cdea5459 RR |
2904 | |
2905 | spin_unlock(&log->l_icloglock); | |
d748c623 | 2906 | } |
1da177e4 LT |
2907 | |
2908 | ||
2909 | /* | |
2910 | * Finish transitioning this iclog to the dirty state. | |
2911 | * | |
2912 | * Make sure that we completely execute this routine only when this is | |
2913 | * the last call to the iclog. There is a good chance that iclog flushes, | |
2914 | * when we reach the end of the physical log, get turned into 2 separate | |
2915 | * calls to bwrite. Hence, one iclog flush could generate two calls to this | |
2916 | * routine. By using the reference count bwritecnt, we guarantee that only | |
2917 | * the second completion goes through. | |
2918 | * | |
2919 | * Callbacks could take time, so they are done outside the scope of the | |
12017faf | 2920 | * global state machine log lock. |
1da177e4 | 2921 | */ |
a8272ce0 | 2922 | STATIC void |
1da177e4 | 2923 | xlog_state_done_syncing( |
d15cbf2f CH |
2924 | struct xlog_in_core *iclog, |
2925 | bool aborted) | |
1da177e4 | 2926 | { |
d15cbf2f | 2927 | struct xlog *log = iclog->ic_log; |
1da177e4 | 2928 | |
b22cd72c | 2929 | spin_lock(&log->l_icloglock); |
1da177e4 | 2930 | |
155cc6b7 | 2931 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 LT |
2932 | |
2933 | /* | |
2934 | * If we got an error, either on the first buffer, or in the case of | |
2935 | * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, | |
2936 | * and none should ever be attempted to be written to disk | |
2937 | * again. | |
2938 | */ | |
1858bb0b | 2939 | if (iclog->ic_state == XLOG_STATE_SYNCING) |
1da177e4 | 2940 | iclog->ic_state = XLOG_STATE_DONE_SYNC; |
1858bb0b CH |
2941 | else |
2942 | ASSERT(iclog->ic_state == XLOG_STATE_IOERROR); | |
1da177e4 LT |
2943 | |
2944 | /* | |
2945 | * Someone could be sleeping prior to writing out the next | |
2946 | * iclog buffer, we wake them all, one will get to do the | |
2947 | * I/O, the others get to wait for the result. | |
2948 | */ | |
eb40a875 | 2949 | wake_up_all(&iclog->ic_write_wait); |
b22cd72c | 2950 | spin_unlock(&log->l_icloglock); |
4b29ab04 | 2951 | xlog_state_do_callback(log, aborted); /* also cleans log */ |
1da177e4 LT |
2952 | } /* xlog_state_done_syncing */ |
2953 | ||
2954 | ||
2955 | /* | |
2956 | * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must | |
12017faf DC |
2957 | * sleep. We wait on the flush queue on the head iclog as that should be |
2958 | * the first iclog to complete flushing. Hence if all iclogs are syncing, | |
2959 | * we will wait here and all new writes will sleep until a sync completes. | |
1da177e4 LT |
2960 | * |
2961 | * The in-core logs are used in a circular fashion. They are not used | |
2962 | * out-of-order even when an iclog past the head is free. | |
2963 | * | |
2964 | * return: | |
2965 | * * log_offset where xlog_write() can start writing into the in-core | |
2966 | * log's data space. | |
2967 | * * in-core log pointer to which xlog_write() should write. | |
2968 | * * boolean indicating this is a continued write to an in-core log. | |
2969 | * If this is the last write, then the in-core log's offset field | |
2970 | * needs to be incremented, depending on the amount of data which | |
2971 | * is copied. | |
2972 | */ | |
a8272ce0 | 2973 | STATIC int |
9a8d2fdb MT |
2974 | xlog_state_get_iclog_space( |
2975 | struct xlog *log, | |
2976 | int len, | |
2977 | struct xlog_in_core **iclogp, | |
2978 | struct xlog_ticket *ticket, | |
2979 | int *continued_write, | |
2980 | int *logoffsetp) | |
1da177e4 | 2981 | { |
1da177e4 LT |
2982 | int log_offset; |
2983 | xlog_rec_header_t *head; | |
2984 | xlog_in_core_t *iclog; | |
1da177e4 LT |
2985 | |
2986 | restart: | |
b22cd72c | 2987 | spin_lock(&log->l_icloglock); |
1da177e4 | 2988 | if (XLOG_FORCED_SHUTDOWN(log)) { |
b22cd72c | 2989 | spin_unlock(&log->l_icloglock); |
2451337d | 2990 | return -EIO; |
1da177e4 LT |
2991 | } |
2992 | ||
2993 | iclog = log->l_iclog; | |
d748c623 | 2994 | if (iclog->ic_state != XLOG_STATE_ACTIVE) { |
ff6d6af2 | 2995 | XFS_STATS_INC(log->l_mp, xs_log_noiclogs); |
d748c623 MW |
2996 | |
2997 | /* Wait for log writes to have flushed */ | |
eb40a875 | 2998 | xlog_wait(&log->l_flush_wait, &log->l_icloglock); |
1da177e4 LT |
2999 | goto restart; |
3000 | } | |
d748c623 | 3001 | |
1da177e4 LT |
3002 | head = &iclog->ic_header; |
3003 | ||
155cc6b7 | 3004 | atomic_inc(&iclog->ic_refcnt); /* prevents sync */ |
1da177e4 LT |
3005 | log_offset = iclog->ic_offset; |
3006 | ||
3007 | /* On the 1st write to an iclog, figure out lsn. This works | |
3008 | * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are | |
3009 | * committing to. If the offset is set, that's how many blocks | |
3010 | * must be written. | |
3011 | */ | |
3012 | if (log_offset == 0) { | |
3013 | ticket->t_curr_res -= log->l_iclog_hsize; | |
0adba536 | 3014 | xlog_tic_add_region(ticket, |
7e9c6396 TS |
3015 | log->l_iclog_hsize, |
3016 | XLOG_REG_TYPE_LRHEADER); | |
b53e675d CH |
3017 | head->h_cycle = cpu_to_be32(log->l_curr_cycle); |
3018 | head->h_lsn = cpu_to_be64( | |
03bea6fe | 3019 | xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block)); |
1da177e4 LT |
3020 | ASSERT(log->l_curr_block >= 0); |
3021 | } | |
3022 | ||
3023 | /* If there is enough room to write everything, then do it. Otherwise, | |
3024 | * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC | |
3025 | * bit is on, so this will get flushed out. Don't update ic_offset | |
3026 | * until you know exactly how many bytes get copied. Therefore, wait | |
3027 | * until later to update ic_offset. | |
3028 | * | |
3029 | * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's | |
3030 | * can fit into remaining data section. | |
3031 | */ | |
3032 | if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { | |
df732b29 CH |
3033 | int error = 0; |
3034 | ||
1da177e4 LT |
3035 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); |
3036 | ||
49641f1a | 3037 | /* |
df732b29 CH |
3038 | * If we are the only one writing to this iclog, sync it to |
3039 | * disk. We need to do an atomic compare and decrement here to | |
3040 | * avoid racing with concurrent atomic_dec_and_lock() calls in | |
49641f1a DC |
3041 | * xlog_state_release_iclog() when there is more than one |
3042 | * reference to the iclog. | |
3043 | */ | |
df732b29 | 3044 | if (!atomic_add_unless(&iclog->ic_refcnt, -1, 1)) |
49641f1a | 3045 | error = xlog_state_release_iclog(log, iclog); |
df732b29 CH |
3046 | spin_unlock(&log->l_icloglock); |
3047 | if (error) | |
3048 | return error; | |
1da177e4 LT |
3049 | goto restart; |
3050 | } | |
3051 | ||
3052 | /* Do we have enough room to write the full amount in the remainder | |
3053 | * of this iclog? Or must we continue a write on the next iclog and | |
3054 | * mark this iclog as completely taken? In the case where we switch | |
3055 | * iclogs (to mark it taken), this particular iclog will release/sync | |
3056 | * to disk in xlog_write(). | |
3057 | */ | |
3058 | if (len <= iclog->ic_size - iclog->ic_offset) { | |
3059 | *continued_write = 0; | |
3060 | iclog->ic_offset += len; | |
3061 | } else { | |
3062 | *continued_write = 1; | |
3063 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
3064 | } | |
3065 | *iclogp = iclog; | |
3066 | ||
3067 | ASSERT(iclog->ic_offset <= iclog->ic_size); | |
b22cd72c | 3068 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3069 | |
3070 | *logoffsetp = log_offset; | |
3071 | return 0; | |
3072 | } /* xlog_state_get_iclog_space */ | |
3073 | ||
1da177e4 LT |
3074 | /* The first cnt-1 times through here we don't need to |
3075 | * move the grant write head because the permanent | |
3076 | * reservation has reserved cnt times the unit amount. | |
3077 | * Release part of current permanent unit reservation and | |
3078 | * reset current reservation to be one units worth. Also | |
3079 | * move grant reservation head forward. | |
3080 | */ | |
3081 | STATIC void | |
9a8d2fdb MT |
3082 | xlog_regrant_reserve_log_space( |
3083 | struct xlog *log, | |
3084 | struct xlog_ticket *ticket) | |
1da177e4 | 3085 | { |
0b1b213f CH |
3086 | trace_xfs_log_regrant_reserve_enter(log, ticket); |
3087 | ||
1da177e4 LT |
3088 | if (ticket->t_cnt > 0) |
3089 | ticket->t_cnt--; | |
3090 | ||
28496968 | 3091 | xlog_grant_sub_space(log, &log->l_reserve_head.grant, |
a69ed03c | 3092 | ticket->t_curr_res); |
28496968 | 3093 | xlog_grant_sub_space(log, &log->l_write_head.grant, |
a69ed03c | 3094 | ticket->t_curr_res); |
1da177e4 | 3095 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 3096 | xlog_tic_reset_res(ticket); |
0b1b213f CH |
3097 | |
3098 | trace_xfs_log_regrant_reserve_sub(log, ticket); | |
3099 | ||
1da177e4 | 3100 | /* just return if we still have some of the pre-reserved space */ |
d0eb2f38 | 3101 | if (ticket->t_cnt > 0) |
1da177e4 | 3102 | return; |
1da177e4 | 3103 | |
28496968 | 3104 | xlog_grant_add_space(log, &log->l_reserve_head.grant, |
a69ed03c | 3105 | ticket->t_unit_res); |
0b1b213f CH |
3106 | |
3107 | trace_xfs_log_regrant_reserve_exit(log, ticket); | |
3108 | ||
1da177e4 | 3109 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 3110 | xlog_tic_reset_res(ticket); |
1da177e4 LT |
3111 | } /* xlog_regrant_reserve_log_space */ |
3112 | ||
3113 | ||
3114 | /* | |
3115 | * Give back the space left from a reservation. | |
3116 | * | |
3117 | * All the information we need to make a correct determination of space left | |
3118 | * is present. For non-permanent reservations, things are quite easy. The | |
3119 | * count should have been decremented to zero. We only need to deal with the | |
3120 | * space remaining in the current reservation part of the ticket. If the | |
3121 | * ticket contains a permanent reservation, there may be left over space which | |
3122 | * needs to be released. A count of N means that N-1 refills of the current | |
3123 | * reservation can be done before we need to ask for more space. The first | |
3124 | * one goes to fill up the first current reservation. Once we run out of | |
3125 | * space, the count will stay at zero and the only space remaining will be | |
3126 | * in the current reservation field. | |
3127 | */ | |
3128 | STATIC void | |
9a8d2fdb MT |
3129 | xlog_ungrant_log_space( |
3130 | struct xlog *log, | |
3131 | struct xlog_ticket *ticket) | |
1da177e4 | 3132 | { |
663e496a DC |
3133 | int bytes; |
3134 | ||
1da177e4 LT |
3135 | if (ticket->t_cnt > 0) |
3136 | ticket->t_cnt--; | |
3137 | ||
0b1b213f | 3138 | trace_xfs_log_ungrant_enter(log, ticket); |
0b1b213f | 3139 | trace_xfs_log_ungrant_sub(log, ticket); |
1da177e4 | 3140 | |
663e496a DC |
3141 | /* |
3142 | * If this is a permanent reservation ticket, we may be able to free | |
1da177e4 LT |
3143 | * up more space based on the remaining count. |
3144 | */ | |
663e496a | 3145 | bytes = ticket->t_curr_res; |
1da177e4 LT |
3146 | if (ticket->t_cnt > 0) { |
3147 | ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); | |
663e496a | 3148 | bytes += ticket->t_unit_res*ticket->t_cnt; |
1da177e4 LT |
3149 | } |
3150 | ||
28496968 CH |
3151 | xlog_grant_sub_space(log, &log->l_reserve_head.grant, bytes); |
3152 | xlog_grant_sub_space(log, &log->l_write_head.grant, bytes); | |
663e496a | 3153 | |
0b1b213f CH |
3154 | trace_xfs_log_ungrant_exit(log, ticket); |
3155 | ||
cfb7cdca | 3156 | xfs_log_space_wake(log->l_mp); |
09a423a3 | 3157 | } |
1da177e4 | 3158 | |
1da177e4 LT |
3159 | /* |
3160 | * This routine will mark the current iclog in the ring as WANT_SYNC | |
3161 | * and move the current iclog pointer to the next iclog in the ring. | |
3162 | * When this routine is called from xlog_state_get_iclog_space(), the | |
3163 | * exact size of the iclog has not yet been determined. All we know is | |
3164 | * that every data block. We have run out of space in this log record. | |
3165 | */ | |
3166 | STATIC void | |
9a8d2fdb MT |
3167 | xlog_state_switch_iclogs( |
3168 | struct xlog *log, | |
3169 | struct xlog_in_core *iclog, | |
3170 | int eventual_size) | |
1da177e4 LT |
3171 | { |
3172 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); | |
3173 | if (!eventual_size) | |
3174 | eventual_size = iclog->ic_offset; | |
3175 | iclog->ic_state = XLOG_STATE_WANT_SYNC; | |
b53e675d | 3176 | iclog->ic_header.h_prev_block = cpu_to_be32(log->l_prev_block); |
1da177e4 LT |
3177 | log->l_prev_block = log->l_curr_block; |
3178 | log->l_prev_cycle = log->l_curr_cycle; | |
3179 | ||
3180 | /* roll log?: ic_offset changed later */ | |
3181 | log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); | |
3182 | ||
3183 | /* Round up to next log-sunit */ | |
62118709 | 3184 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && |
1da177e4 | 3185 | log->l_mp->m_sb.sb_logsunit > 1) { |
c8ce540d | 3186 | uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); |
1da177e4 LT |
3187 | log->l_curr_block = roundup(log->l_curr_block, sunit_bb); |
3188 | } | |
3189 | ||
3190 | if (log->l_curr_block >= log->l_logBBsize) { | |
a45086e2 BF |
3191 | /* |
3192 | * Rewind the current block before the cycle is bumped to make | |
3193 | * sure that the combined LSN never transiently moves forward | |
3194 | * when the log wraps to the next cycle. This is to support the | |
3195 | * unlocked sample of these fields from xlog_valid_lsn(). Most | |
3196 | * other cases should acquire l_icloglock. | |
3197 | */ | |
3198 | log->l_curr_block -= log->l_logBBsize; | |
3199 | ASSERT(log->l_curr_block >= 0); | |
3200 | smp_wmb(); | |
1da177e4 LT |
3201 | log->l_curr_cycle++; |
3202 | if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) | |
3203 | log->l_curr_cycle++; | |
1da177e4 LT |
3204 | } |
3205 | ASSERT(iclog == log->l_iclog); | |
3206 | log->l_iclog = iclog->ic_next; | |
3207 | } /* xlog_state_switch_iclogs */ | |
3208 | ||
1da177e4 LT |
3209 | /* |
3210 | * Write out all data in the in-core log as of this exact moment in time. | |
3211 | * | |
3212 | * Data may be written to the in-core log during this call. However, | |
3213 | * we don't guarantee this data will be written out. A change from past | |
3214 | * implementation means this routine will *not* write out zero length LRs. | |
3215 | * | |
3216 | * Basically, we try and perform an intelligent scan of the in-core logs. | |
3217 | * If we determine there is no flushable data, we just return. There is no | |
3218 | * flushable data if: | |
3219 | * | |
3220 | * 1. the current iclog is active and has no data; the previous iclog | |
3221 | * is in the active or dirty state. | |
3222 | * 2. the current iclog is drity, and the previous iclog is in the | |
3223 | * active or dirty state. | |
3224 | * | |
12017faf | 3225 | * We may sleep if: |
1da177e4 LT |
3226 | * |
3227 | * 1. the current iclog is not in the active nor dirty state. | |
3228 | * 2. the current iclog dirty, and the previous iclog is not in the | |
3229 | * active nor dirty state. | |
3230 | * 3. the current iclog is active, and there is another thread writing | |
3231 | * to this particular iclog. | |
3232 | * 4. a) the current iclog is active and has no other writers | |
3233 | * b) when we return from flushing out this iclog, it is still | |
3234 | * not in the active nor dirty state. | |
3235 | */ | |
a14a348b | 3236 | int |
60e5bb78 | 3237 | xfs_log_force( |
a14a348b | 3238 | struct xfs_mount *mp, |
60e5bb78 | 3239 | uint flags) |
1da177e4 | 3240 | { |
ad223e60 | 3241 | struct xlog *log = mp->m_log; |
a14a348b CH |
3242 | struct xlog_in_core *iclog; |
3243 | xfs_lsn_t lsn; | |
3244 | ||
ff6d6af2 | 3245 | XFS_STATS_INC(mp, xs_log_force); |
60e5bb78 | 3246 | trace_xfs_log_force(mp, 0, _RET_IP_); |
1da177e4 | 3247 | |
93b8a585 | 3248 | xlog_cil_force(log); |
71e330b5 | 3249 | |
b22cd72c | 3250 | spin_lock(&log->l_icloglock); |
1da177e4 | 3251 | iclog = log->l_iclog; |
1858bb0b | 3252 | if (iclog->ic_state == XLOG_STATE_IOERROR) |
e6b96570 | 3253 | goto out_error; |
1da177e4 | 3254 | |
e6b96570 CH |
3255 | if (iclog->ic_state == XLOG_STATE_DIRTY || |
3256 | (iclog->ic_state == XLOG_STATE_ACTIVE && | |
3257 | atomic_read(&iclog->ic_refcnt) == 0 && iclog->ic_offset == 0)) { | |
1da177e4 | 3258 | /* |
e6b96570 CH |
3259 | * If the head is dirty or (active and empty), then we need to |
3260 | * look at the previous iclog. | |
3261 | * | |
3262 | * If the previous iclog is active or dirty we are done. There | |
3263 | * is nothing to sync out. Otherwise, we attach ourselves to the | |
1da177e4 LT |
3264 | * previous iclog and go to sleep. |
3265 | */ | |
e6b96570 CH |
3266 | iclog = iclog->ic_prev; |
3267 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
3268 | iclog->ic_state == XLOG_STATE_DIRTY) | |
3269 | goto out_unlock; | |
3270 | } else if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3271 | if (atomic_read(&iclog->ic_refcnt) == 0) { | |
3272 | /* | |
3273 | * We are the only one with access to this iclog. | |
3274 | * | |
3275 | * Flush it out now. There should be a roundoff of zero | |
3276 | * to show that someone has already taken care of the | |
3277 | * roundoff from the previous sync. | |
3278 | */ | |
3279 | atomic_inc(&iclog->ic_refcnt); | |
3280 | lsn = be64_to_cpu(iclog->ic_header.h_lsn); | |
3281 | xlog_state_switch_iclogs(log, iclog, 0); | |
e6b96570 | 3282 | if (xlog_state_release_iclog(log, iclog)) |
df732b29 | 3283 | goto out_error; |
1da177e4 | 3284 | |
e6b96570 CH |
3285 | if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn || |
3286 | iclog->ic_state == XLOG_STATE_DIRTY) | |
3287 | goto out_unlock; | |
3288 | } else { | |
3289 | /* | |
3290 | * Someone else is writing to this iclog. | |
3291 | * | |
3292 | * Use its call to flush out the data. However, the | |
3293 | * other thread may not force out this LR, so we mark | |
3294 | * it WANT_SYNC. | |
3295 | */ | |
3296 | xlog_state_switch_iclogs(log, iclog, 0); | |
1da177e4 | 3297 | } |
e6b96570 | 3298 | } else { |
1da177e4 | 3299 | /* |
e6b96570 CH |
3300 | * If the head iclog is not active nor dirty, we just attach |
3301 | * ourselves to the head and go to sleep if necessary. | |
1da177e4 | 3302 | */ |
e6b96570 | 3303 | ; |
1da177e4 | 3304 | } |
e6b96570 CH |
3305 | |
3306 | if (!(flags & XFS_LOG_SYNC)) | |
3307 | goto out_unlock; | |
3308 | ||
1858bb0b | 3309 | if (iclog->ic_state == XLOG_STATE_IOERROR) |
e6b96570 CH |
3310 | goto out_error; |
3311 | XFS_STATS_INC(mp, xs_log_force_sleep); | |
3312 | xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); | |
1858bb0b | 3313 | if (iclog->ic_state == XLOG_STATE_IOERROR) |
e6b96570 | 3314 | return -EIO; |
1da177e4 | 3315 | return 0; |
e6b96570 CH |
3316 | |
3317 | out_unlock: | |
3318 | spin_unlock(&log->l_icloglock); | |
3319 | return 0; | |
3320 | out_error: | |
3321 | spin_unlock(&log->l_icloglock); | |
3322 | return -EIO; | |
a14a348b | 3323 | } |
1da177e4 | 3324 | |
3e4da466 CH |
3325 | static int |
3326 | __xfs_log_force_lsn( | |
a14a348b CH |
3327 | struct xfs_mount *mp, |
3328 | xfs_lsn_t lsn, | |
3329 | uint flags, | |
3e4da466 CH |
3330 | int *log_flushed, |
3331 | bool already_slept) | |
1da177e4 | 3332 | { |
ad223e60 | 3333 | struct xlog *log = mp->m_log; |
a14a348b | 3334 | struct xlog_in_core *iclog; |
71e330b5 | 3335 | |
a14a348b CH |
3336 | spin_lock(&log->l_icloglock); |
3337 | iclog = log->l_iclog; | |
1858bb0b | 3338 | if (iclog->ic_state == XLOG_STATE_IOERROR) |
93806299 | 3339 | goto out_error; |
1da177e4 | 3340 | |
93806299 CH |
3341 | while (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) { |
3342 | iclog = iclog->ic_next; | |
3343 | if (iclog == log->l_iclog) | |
3344 | goto out_unlock; | |
3345 | } | |
a14a348b | 3346 | |
93806299 CH |
3347 | if (iclog->ic_state == XLOG_STATE_DIRTY) |
3348 | goto out_unlock; | |
a14a348b | 3349 | |
93806299 CH |
3350 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { |
3351 | /* | |
3352 | * We sleep here if we haven't already slept (e.g. this is the | |
3353 | * first time we've looked at the correct iclog buf) and the | |
3354 | * buffer before us is going to be sync'ed. The reason for this | |
3355 | * is that if we are doing sync transactions here, by waiting | |
3356 | * for the previous I/O to complete, we can allow a few more | |
3357 | * transactions into this iclog before we close it down. | |
3358 | * | |
3359 | * Otherwise, we mark the buffer WANT_SYNC, and bump up the | |
3360 | * refcnt so we can release the log (which drops the ref count). | |
3361 | * The state switch keeps new transaction commits from using | |
3362 | * this buffer. When the current commits finish writing into | |
3363 | * the buffer, the refcount will drop to zero and the buffer | |
3364 | * will go out then. | |
3365 | */ | |
3366 | if (!already_slept && | |
1858bb0b CH |
3367 | (iclog->ic_prev->ic_state == XLOG_STATE_WANT_SYNC || |
3368 | iclog->ic_prev->ic_state == XLOG_STATE_SYNCING)) { | |
93806299 | 3369 | XFS_STATS_INC(mp, xs_log_force_sleep); |
a14a348b | 3370 | |
93806299 CH |
3371 | xlog_wait(&iclog->ic_prev->ic_write_wait, |
3372 | &log->l_icloglock); | |
3e4da466 | 3373 | return -EAGAIN; |
1da177e4 | 3374 | } |
93806299 CH |
3375 | atomic_inc(&iclog->ic_refcnt); |
3376 | xlog_state_switch_iclogs(log, iclog, 0); | |
93806299 | 3377 | if (xlog_state_release_iclog(log, iclog)) |
df732b29 | 3378 | goto out_error; |
93806299 CH |
3379 | if (log_flushed) |
3380 | *log_flushed = 1; | |
93806299 | 3381 | } |
1da177e4 | 3382 | |
93806299 | 3383 | if (!(flags & XFS_LOG_SYNC) || |
1858bb0b CH |
3384 | (iclog->ic_state == XLOG_STATE_ACTIVE || |
3385 | iclog->ic_state == XLOG_STATE_DIRTY)) | |
93806299 | 3386 | goto out_unlock; |
1da177e4 | 3387 | |
1858bb0b | 3388 | if (iclog->ic_state == XLOG_STATE_IOERROR) |
93806299 CH |
3389 | goto out_error; |
3390 | ||
3391 | XFS_STATS_INC(mp, xs_log_force_sleep); | |
3392 | xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); | |
1858bb0b | 3393 | if (iclog->ic_state == XLOG_STATE_IOERROR) |
93806299 CH |
3394 | return -EIO; |
3395 | return 0; | |
1da177e4 | 3396 | |
93806299 | 3397 | out_unlock: |
a14a348b CH |
3398 | spin_unlock(&log->l_icloglock); |
3399 | return 0; | |
93806299 CH |
3400 | out_error: |
3401 | spin_unlock(&log->l_icloglock); | |
3402 | return -EIO; | |
a14a348b CH |
3403 | } |
3404 | ||
3e4da466 CH |
3405 | /* |
3406 | * Force the in-core log to disk for a specific LSN. | |
3407 | * | |
3408 | * Find in-core log with lsn. | |
3409 | * If it is in the DIRTY state, just return. | |
3410 | * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC | |
3411 | * state and go to sleep or return. | |
3412 | * If it is in any other state, go to sleep or return. | |
3413 | * | |
3414 | * Synchronous forces are implemented with a wait queue. All callers trying | |
3415 | * to force a given lsn to disk must wait on the queue attached to the | |
3416 | * specific in-core log. When given in-core log finally completes its write | |
3417 | * to disk, that thread will wake up all threads waiting on the queue. | |
3418 | */ | |
3419 | int | |
3420 | xfs_log_force_lsn( | |
3421 | struct xfs_mount *mp, | |
3422 | xfs_lsn_t lsn, | |
3423 | uint flags, | |
3424 | int *log_flushed) | |
3425 | { | |
3426 | int ret; | |
3427 | ASSERT(lsn != 0); | |
3428 | ||
3429 | XFS_STATS_INC(mp, xs_log_force); | |
3430 | trace_xfs_log_force(mp, lsn, _RET_IP_); | |
3431 | ||
3432 | lsn = xlog_cil_force_lsn(mp->m_log, lsn); | |
3433 | if (lsn == NULLCOMMITLSN) | |
3434 | return 0; | |
3435 | ||
3436 | ret = __xfs_log_force_lsn(mp, lsn, flags, log_flushed, false); | |
3437 | if (ret == -EAGAIN) | |
3438 | ret = __xfs_log_force_lsn(mp, lsn, flags, log_flushed, true); | |
3439 | return ret; | |
3440 | } | |
3441 | ||
1da177e4 LT |
3442 | /* |
3443 | * Called when we want to mark the current iclog as being ready to sync to | |
3444 | * disk. | |
3445 | */ | |
a8272ce0 | 3446 | STATIC void |
9a8d2fdb MT |
3447 | xlog_state_want_sync( |
3448 | struct xlog *log, | |
3449 | struct xlog_in_core *iclog) | |
1da177e4 | 3450 | { |
a8914f3a | 3451 | assert_spin_locked(&log->l_icloglock); |
1da177e4 LT |
3452 | |
3453 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3454 | xlog_state_switch_iclogs(log, iclog, 0); | |
3455 | } else { | |
1858bb0b CH |
3456 | ASSERT(iclog->ic_state == XLOG_STATE_WANT_SYNC || |
3457 | iclog->ic_state == XLOG_STATE_IOERROR); | |
1da177e4 | 3458 | } |
39e2defe | 3459 | } |
1da177e4 LT |
3460 | |
3461 | ||
3462 | /***************************************************************************** | |
3463 | * | |
3464 | * TICKET functions | |
3465 | * | |
3466 | ***************************************************************************** | |
3467 | */ | |
3468 | ||
3469 | /* | |
9da096fd | 3470 | * Free a used ticket when its refcount falls to zero. |
1da177e4 | 3471 | */ |
cc09c0dc DC |
3472 | void |
3473 | xfs_log_ticket_put( | |
3474 | xlog_ticket_t *ticket) | |
1da177e4 | 3475 | { |
cc09c0dc | 3476 | ASSERT(atomic_read(&ticket->t_ref) > 0); |
eb40a875 | 3477 | if (atomic_dec_and_test(&ticket->t_ref)) |
377bcd5f | 3478 | kmem_cache_free(xfs_log_ticket_zone, ticket); |
cc09c0dc | 3479 | } |
1da177e4 | 3480 | |
cc09c0dc DC |
3481 | xlog_ticket_t * |
3482 | xfs_log_ticket_get( | |
3483 | xlog_ticket_t *ticket) | |
3484 | { | |
3485 | ASSERT(atomic_read(&ticket->t_ref) > 0); | |
3486 | atomic_inc(&ticket->t_ref); | |
3487 | return ticket; | |
3488 | } | |
1da177e4 LT |
3489 | |
3490 | /* | |
e773fc93 JL |
3491 | * Figure out the total log space unit (in bytes) that would be |
3492 | * required for a log ticket. | |
1da177e4 | 3493 | */ |
e773fc93 JL |
3494 | int |
3495 | xfs_log_calc_unit_res( | |
3496 | struct xfs_mount *mp, | |
3497 | int unit_bytes) | |
1da177e4 | 3498 | { |
e773fc93 JL |
3499 | struct xlog *log = mp->m_log; |
3500 | int iclog_space; | |
3501 | uint num_headers; | |
1da177e4 LT |
3502 | |
3503 | /* | |
3504 | * Permanent reservations have up to 'cnt'-1 active log operations | |
3505 | * in the log. A unit in this case is the amount of space for one | |
3506 | * of these log operations. Normal reservations have a cnt of 1 | |
3507 | * and their unit amount is the total amount of space required. | |
3508 | * | |
3509 | * The following lines of code account for non-transaction data | |
32fb9b57 TS |
3510 | * which occupy space in the on-disk log. |
3511 | * | |
3512 | * Normal form of a transaction is: | |
3513 | * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> | |
3514 | * and then there are LR hdrs, split-recs and roundoff at end of syncs. | |
3515 | * | |
3516 | * We need to account for all the leadup data and trailer data | |
3517 | * around the transaction data. | |
3518 | * And then we need to account for the worst case in terms of using | |
3519 | * more space. | |
3520 | * The worst case will happen if: | |
3521 | * - the placement of the transaction happens to be such that the | |
3522 | * roundoff is at its maximum | |
3523 | * - the transaction data is synced before the commit record is synced | |
3524 | * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> | |
3525 | * Therefore the commit record is in its own Log Record. | |
3526 | * This can happen as the commit record is called with its | |
3527 | * own region to xlog_write(). | |
3528 | * This then means that in the worst case, roundoff can happen for | |
3529 | * the commit-rec as well. | |
3530 | * The commit-rec is smaller than padding in this scenario and so it is | |
3531 | * not added separately. | |
1da177e4 LT |
3532 | */ |
3533 | ||
32fb9b57 TS |
3534 | /* for trans header */ |
3535 | unit_bytes += sizeof(xlog_op_header_t); | |
3536 | unit_bytes += sizeof(xfs_trans_header_t); | |
3537 | ||
1da177e4 | 3538 | /* for start-rec */ |
32fb9b57 TS |
3539 | unit_bytes += sizeof(xlog_op_header_t); |
3540 | ||
9b9fc2b7 DC |
3541 | /* |
3542 | * for LR headers - the space for data in an iclog is the size minus | |
3543 | * the space used for the headers. If we use the iclog size, then we | |
3544 | * undercalculate the number of headers required. | |
3545 | * | |
3546 | * Furthermore - the addition of op headers for split-recs might | |
3547 | * increase the space required enough to require more log and op | |
3548 | * headers, so take that into account too. | |
3549 | * | |
3550 | * IMPORTANT: This reservation makes the assumption that if this | |
3551 | * transaction is the first in an iclog and hence has the LR headers | |
3552 | * accounted to it, then the remaining space in the iclog is | |
3553 | * exclusively for this transaction. i.e. if the transaction is larger | |
3554 | * than the iclog, it will be the only thing in that iclog. | |
3555 | * Fundamentally, this means we must pass the entire log vector to | |
3556 | * xlog_write to guarantee this. | |
3557 | */ | |
3558 | iclog_space = log->l_iclog_size - log->l_iclog_hsize; | |
3559 | num_headers = howmany(unit_bytes, iclog_space); | |
3560 | ||
3561 | /* for split-recs - ophdrs added when data split over LRs */ | |
3562 | unit_bytes += sizeof(xlog_op_header_t) * num_headers; | |
3563 | ||
3564 | /* add extra header reservations if we overrun */ | |
3565 | while (!num_headers || | |
3566 | howmany(unit_bytes, iclog_space) > num_headers) { | |
3567 | unit_bytes += sizeof(xlog_op_header_t); | |
3568 | num_headers++; | |
3569 | } | |
32fb9b57 | 3570 | unit_bytes += log->l_iclog_hsize * num_headers; |
1da177e4 | 3571 | |
32fb9b57 TS |
3572 | /* for commit-rec LR header - note: padding will subsume the ophdr */ |
3573 | unit_bytes += log->l_iclog_hsize; | |
3574 | ||
32fb9b57 | 3575 | /* for roundoff padding for transaction data and one for commit record */ |
e773fc93 | 3576 | if (xfs_sb_version_haslogv2(&mp->m_sb) && mp->m_sb.sb_logsunit > 1) { |
1da177e4 | 3577 | /* log su roundoff */ |
e773fc93 | 3578 | unit_bytes += 2 * mp->m_sb.sb_logsunit; |
1da177e4 LT |
3579 | } else { |
3580 | /* BB roundoff */ | |
e773fc93 | 3581 | unit_bytes += 2 * BBSIZE; |
1da177e4 LT |
3582 | } |
3583 | ||
e773fc93 JL |
3584 | return unit_bytes; |
3585 | } | |
3586 | ||
3587 | /* | |
3588 | * Allocate and initialise a new log ticket. | |
3589 | */ | |
3590 | struct xlog_ticket * | |
3591 | xlog_ticket_alloc( | |
3592 | struct xlog *log, | |
3593 | int unit_bytes, | |
3594 | int cnt, | |
3595 | char client, | |
3596 | bool permanent, | |
3597 | xfs_km_flags_t alloc_flags) | |
3598 | { | |
3599 | struct xlog_ticket *tic; | |
3600 | int unit_res; | |
3601 | ||
3602 | tic = kmem_zone_zalloc(xfs_log_ticket_zone, alloc_flags); | |
3603 | if (!tic) | |
3604 | return NULL; | |
3605 | ||
3606 | unit_res = xfs_log_calc_unit_res(log->l_mp, unit_bytes); | |
3607 | ||
cc09c0dc | 3608 | atomic_set(&tic->t_ref, 1); |
14a7235f | 3609 | tic->t_task = current; |
10547941 | 3610 | INIT_LIST_HEAD(&tic->t_queue); |
e773fc93 JL |
3611 | tic->t_unit_res = unit_res; |
3612 | tic->t_curr_res = unit_res; | |
1da177e4 LT |
3613 | tic->t_cnt = cnt; |
3614 | tic->t_ocnt = cnt; | |
ecb3403d | 3615 | tic->t_tid = prandom_u32(); |
1da177e4 LT |
3616 | tic->t_clientid = client; |
3617 | tic->t_flags = XLOG_TIC_INITED; | |
9006fb91 | 3618 | if (permanent) |
1da177e4 | 3619 | tic->t_flags |= XLOG_TIC_PERM_RESERV; |
1da177e4 | 3620 | |
0adba536 | 3621 | xlog_tic_reset_res(tic); |
7e9c6396 | 3622 | |
1da177e4 | 3623 | return tic; |
cc09c0dc | 3624 | } |
1da177e4 LT |
3625 | |
3626 | ||
3627 | /****************************************************************************** | |
3628 | * | |
3629 | * Log debug routines | |
3630 | * | |
3631 | ****************************************************************************** | |
3632 | */ | |
cfcbbbd0 | 3633 | #if defined(DEBUG) |
1da177e4 LT |
3634 | /* |
3635 | * Make sure that the destination ptr is within the valid data region of | |
3636 | * one of the iclogs. This uses backup pointers stored in a different | |
3637 | * part of the log in case we trash the log structure. | |
3638 | */ | |
181fdfe6 | 3639 | STATIC void |
e6b1f273 | 3640 | xlog_verify_dest_ptr( |
ad223e60 | 3641 | struct xlog *log, |
5809d5e0 | 3642 | void *ptr) |
1da177e4 LT |
3643 | { |
3644 | int i; | |
3645 | int good_ptr = 0; | |
3646 | ||
e6b1f273 CH |
3647 | for (i = 0; i < log->l_iclog_bufs; i++) { |
3648 | if (ptr >= log->l_iclog_bak[i] && | |
3649 | ptr <= log->l_iclog_bak[i] + log->l_iclog_size) | |
1da177e4 LT |
3650 | good_ptr++; |
3651 | } | |
e6b1f273 CH |
3652 | |
3653 | if (!good_ptr) | |
a0fa2b67 | 3654 | xfs_emerg(log->l_mp, "%s: invalid ptr", __func__); |
e6b1f273 | 3655 | } |
1da177e4 | 3656 | |
da8a1a4a DC |
3657 | /* |
3658 | * Check to make sure the grant write head didn't just over lap the tail. If | |
3659 | * the cycles are the same, we can't be overlapping. Otherwise, make sure that | |
3660 | * the cycles differ by exactly one and check the byte count. | |
3661 | * | |
3662 | * This check is run unlocked, so can give false positives. Rather than assert | |
3663 | * on failures, use a warn-once flag and a panic tag to allow the admin to | |
3664 | * determine if they want to panic the machine when such an error occurs. For | |
3665 | * debug kernels this will have the same effect as using an assert but, unlinke | |
3666 | * an assert, it can be turned off at runtime. | |
3667 | */ | |
3f336c6f DC |
3668 | STATIC void |
3669 | xlog_verify_grant_tail( | |
ad223e60 | 3670 | struct xlog *log) |
3f336c6f | 3671 | { |
1c3cb9ec | 3672 | int tail_cycle, tail_blocks; |
a69ed03c | 3673 | int cycle, space; |
3f336c6f | 3674 | |
28496968 | 3675 | xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &space); |
1c3cb9ec DC |
3676 | xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_blocks); |
3677 | if (tail_cycle != cycle) { | |
da8a1a4a DC |
3678 | if (cycle - 1 != tail_cycle && |
3679 | !(log->l_flags & XLOG_TAIL_WARN)) { | |
3680 | xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, | |
3681 | "%s: cycle - 1 != tail_cycle", __func__); | |
3682 | log->l_flags |= XLOG_TAIL_WARN; | |
3683 | } | |
3684 | ||
3685 | if (space > BBTOB(tail_blocks) && | |
3686 | !(log->l_flags & XLOG_TAIL_WARN)) { | |
3687 | xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, | |
3688 | "%s: space > BBTOB(tail_blocks)", __func__); | |
3689 | log->l_flags |= XLOG_TAIL_WARN; | |
3690 | } | |
3f336c6f DC |
3691 | } |
3692 | } | |
3693 | ||
1da177e4 LT |
3694 | /* check if it will fit */ |
3695 | STATIC void | |
9a8d2fdb MT |
3696 | xlog_verify_tail_lsn( |
3697 | struct xlog *log, | |
3698 | struct xlog_in_core *iclog, | |
3699 | xfs_lsn_t tail_lsn) | |
1da177e4 LT |
3700 | { |
3701 | int blocks; | |
3702 | ||
3703 | if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { | |
3704 | blocks = | |
3705 | log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); | |
3706 | if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) | |
a0fa2b67 | 3707 | xfs_emerg(log->l_mp, "%s: ran out of log space", __func__); |
1da177e4 LT |
3708 | } else { |
3709 | ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); | |
3710 | ||
3711 | if (BLOCK_LSN(tail_lsn) == log->l_prev_block) | |
a0fa2b67 | 3712 | xfs_emerg(log->l_mp, "%s: tail wrapped", __func__); |
1da177e4 LT |
3713 | |
3714 | blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; | |
3715 | if (blocks < BTOBB(iclog->ic_offset) + 1) | |
a0fa2b67 | 3716 | xfs_emerg(log->l_mp, "%s: ran out of log space", __func__); |
1da177e4 LT |
3717 | } |
3718 | } /* xlog_verify_tail_lsn */ | |
3719 | ||
3720 | /* | |
3721 | * Perform a number of checks on the iclog before writing to disk. | |
3722 | * | |
3723 | * 1. Make sure the iclogs are still circular | |
3724 | * 2. Make sure we have a good magic number | |
3725 | * 3. Make sure we don't have magic numbers in the data | |
3726 | * 4. Check fields of each log operation header for: | |
3727 | * A. Valid client identifier | |
3728 | * B. tid ptr value falls in valid ptr space (user space code) | |
3729 | * C. Length in log record header is correct according to the | |
3730 | * individual operation headers within record. | |
3731 | * 5. When a bwrite will occur within 5 blocks of the front of the physical | |
3732 | * log, check the preceding blocks of the physical log to make sure all | |
3733 | * the cycle numbers agree with the current cycle number. | |
3734 | */ | |
3735 | STATIC void | |
9a8d2fdb MT |
3736 | xlog_verify_iclog( |
3737 | struct xlog *log, | |
3738 | struct xlog_in_core *iclog, | |
abca1f33 | 3739 | int count) |
1da177e4 LT |
3740 | { |
3741 | xlog_op_header_t *ophead; | |
3742 | xlog_in_core_t *icptr; | |
3743 | xlog_in_core_2_t *xhdr; | |
5809d5e0 | 3744 | void *base_ptr, *ptr, *p; |
db9d67d6 | 3745 | ptrdiff_t field_offset; |
c8ce540d | 3746 | uint8_t clientid; |
1da177e4 LT |
3747 | int len, i, j, k, op_len; |
3748 | int idx; | |
1da177e4 LT |
3749 | |
3750 | /* check validity of iclog pointers */ | |
b22cd72c | 3751 | spin_lock(&log->l_icloglock); |
1da177e4 | 3752 | icptr = log->l_iclog; |
643f7c4e GB |
3753 | for (i = 0; i < log->l_iclog_bufs; i++, icptr = icptr->ic_next) |
3754 | ASSERT(icptr); | |
3755 | ||
1da177e4 | 3756 | if (icptr != log->l_iclog) |
a0fa2b67 | 3757 | xfs_emerg(log->l_mp, "%s: corrupt iclog ring", __func__); |
b22cd72c | 3758 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3759 | |
3760 | /* check log magic numbers */ | |
69ef921b | 3761 | if (iclog->ic_header.h_magicno != cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) |
a0fa2b67 | 3762 | xfs_emerg(log->l_mp, "%s: invalid magic num", __func__); |
1da177e4 | 3763 | |
5809d5e0 CH |
3764 | base_ptr = ptr = &iclog->ic_header; |
3765 | p = &iclog->ic_header; | |
3766 | for (ptr += BBSIZE; ptr < base_ptr + count; ptr += BBSIZE) { | |
69ef921b | 3767 | if (*(__be32 *)ptr == cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) |
a0fa2b67 DC |
3768 | xfs_emerg(log->l_mp, "%s: unexpected magic num", |
3769 | __func__); | |
1da177e4 LT |
3770 | } |
3771 | ||
3772 | /* check fields */ | |
b53e675d | 3773 | len = be32_to_cpu(iclog->ic_header.h_num_logops); |
5809d5e0 CH |
3774 | base_ptr = ptr = iclog->ic_datap; |
3775 | ophead = ptr; | |
b28708d6 | 3776 | xhdr = iclog->ic_data; |
1da177e4 | 3777 | for (i = 0; i < len; i++) { |
5809d5e0 | 3778 | ophead = ptr; |
1da177e4 LT |
3779 | |
3780 | /* clientid is only 1 byte */ | |
5809d5e0 CH |
3781 | p = &ophead->oh_clientid; |
3782 | field_offset = p - base_ptr; | |
abca1f33 | 3783 | if (field_offset & 0x1ff) { |
1da177e4 LT |
3784 | clientid = ophead->oh_clientid; |
3785 | } else { | |
b2a922cd | 3786 | idx = BTOBBT((char *)&ophead->oh_clientid - iclog->ic_datap); |
1da177e4 LT |
3787 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { |
3788 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3789 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
03bea6fe CH |
3790 | clientid = xlog_get_client_id( |
3791 | xhdr[j].hic_xheader.xh_cycle_data[k]); | |
1da177e4 | 3792 | } else { |
03bea6fe CH |
3793 | clientid = xlog_get_client_id( |
3794 | iclog->ic_header.h_cycle_data[idx]); | |
1da177e4 LT |
3795 | } |
3796 | } | |
3797 | if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) | |
a0fa2b67 | 3798 | xfs_warn(log->l_mp, |
c9690043 | 3799 | "%s: invalid clientid %d op "PTR_FMT" offset 0x%lx", |
a0fa2b67 DC |
3800 | __func__, clientid, ophead, |
3801 | (unsigned long)field_offset); | |
1da177e4 LT |
3802 | |
3803 | /* check length */ | |
5809d5e0 CH |
3804 | p = &ophead->oh_len; |
3805 | field_offset = p - base_ptr; | |
abca1f33 | 3806 | if (field_offset & 0x1ff) { |
67fcb7bf | 3807 | op_len = be32_to_cpu(ophead->oh_len); |
1da177e4 | 3808 | } else { |
db9d67d6 CH |
3809 | idx = BTOBBT((uintptr_t)&ophead->oh_len - |
3810 | (uintptr_t)iclog->ic_datap); | |
1da177e4 LT |
3811 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { |
3812 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3813 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
b53e675d | 3814 | op_len = be32_to_cpu(xhdr[j].hic_xheader.xh_cycle_data[k]); |
1da177e4 | 3815 | } else { |
b53e675d | 3816 | op_len = be32_to_cpu(iclog->ic_header.h_cycle_data[idx]); |
1da177e4 LT |
3817 | } |
3818 | } | |
3819 | ptr += sizeof(xlog_op_header_t) + op_len; | |
3820 | } | |
3821 | } /* xlog_verify_iclog */ | |
cfcbbbd0 | 3822 | #endif |
1da177e4 LT |
3823 | |
3824 | /* | |
b22cd72c | 3825 | * Mark all iclogs IOERROR. l_icloglock is held by the caller. |
1da177e4 LT |
3826 | */ |
3827 | STATIC int | |
3828 | xlog_state_ioerror( | |
9a8d2fdb | 3829 | struct xlog *log) |
1da177e4 LT |
3830 | { |
3831 | xlog_in_core_t *iclog, *ic; | |
3832 | ||
3833 | iclog = log->l_iclog; | |
1858bb0b | 3834 | if (iclog->ic_state != XLOG_STATE_IOERROR) { |
1da177e4 LT |
3835 | /* |
3836 | * Mark all the incore logs IOERROR. | |
3837 | * From now on, no log flushes will result. | |
3838 | */ | |
3839 | ic = iclog; | |
3840 | do { | |
3841 | ic->ic_state = XLOG_STATE_IOERROR; | |
3842 | ic = ic->ic_next; | |
3843 | } while (ic != iclog); | |
014c2544 | 3844 | return 0; |
1da177e4 LT |
3845 | } |
3846 | /* | |
3847 | * Return non-zero, if state transition has already happened. | |
3848 | */ | |
014c2544 | 3849 | return 1; |
1da177e4 LT |
3850 | } |
3851 | ||
3852 | /* | |
3853 | * This is called from xfs_force_shutdown, when we're forcibly | |
3854 | * shutting down the filesystem, typically because of an IO error. | |
3855 | * Our main objectives here are to make sure that: | |
a870fe6d DC |
3856 | * a. if !logerror, flush the logs to disk. Anything modified |
3857 | * after this is ignored. | |
3858 | * b. the filesystem gets marked 'SHUTDOWN' for all interested | |
1da177e4 | 3859 | * parties to find out, 'atomically'. |
a870fe6d | 3860 | * c. those who're sleeping on log reservations, pinned objects and |
1da177e4 | 3861 | * other resources get woken up, and be told the bad news. |
a870fe6d | 3862 | * d. nothing new gets queued up after (b) and (c) are done. |
9da1ab18 | 3863 | * |
a870fe6d DC |
3864 | * Note: for the !logerror case we need to flush the regions held in memory out |
3865 | * to disk first. This needs to be done before the log is marked as shutdown, | |
3866 | * otherwise the iclog writes will fail. | |
1da177e4 LT |
3867 | */ |
3868 | int | |
3869 | xfs_log_force_umount( | |
3870 | struct xfs_mount *mp, | |
3871 | int logerror) | |
3872 | { | |
9a8d2fdb | 3873 | struct xlog *log; |
1da177e4 | 3874 | int retval; |
1da177e4 LT |
3875 | |
3876 | log = mp->m_log; | |
3877 | ||
3878 | /* | |
3879 | * If this happens during log recovery, don't worry about | |
3880 | * locking; the log isn't open for business yet. | |
3881 | */ | |
3882 | if (!log || | |
3883 | log->l_flags & XLOG_ACTIVE_RECOVERY) { | |
3884 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; | |
bac8dca9 | 3885 | if (mp->m_sb_bp) |
b0388bf1 | 3886 | mp->m_sb_bp->b_flags |= XBF_DONE; |
014c2544 | 3887 | return 0; |
1da177e4 LT |
3888 | } |
3889 | ||
3890 | /* | |
3891 | * Somebody could've already done the hard work for us. | |
3892 | * No need to get locks for this. | |
3893 | */ | |
1858bb0b | 3894 | if (logerror && log->l_iclog->ic_state == XLOG_STATE_IOERROR) { |
1da177e4 | 3895 | ASSERT(XLOG_FORCED_SHUTDOWN(log)); |
014c2544 | 3896 | return 1; |
1da177e4 | 3897 | } |
9da1ab18 DC |
3898 | |
3899 | /* | |
a870fe6d DC |
3900 | * Flush all the completed transactions to disk before marking the log |
3901 | * being shut down. We need to do it in this order to ensure that | |
3902 | * completed operations are safely on disk before we shut down, and that | |
3903 | * we don't have to issue any buffer IO after the shutdown flags are set | |
3904 | * to guarantee this. | |
9da1ab18 | 3905 | */ |
93b8a585 | 3906 | if (!logerror) |
60e5bb78 | 3907 | xfs_log_force(mp, XFS_LOG_SYNC); |
9da1ab18 | 3908 | |
1da177e4 | 3909 | /* |
3f16b985 DC |
3910 | * mark the filesystem and the as in a shutdown state and wake |
3911 | * everybody up to tell them the bad news. | |
1da177e4 | 3912 | */ |
b22cd72c | 3913 | spin_lock(&log->l_icloglock); |
1da177e4 | 3914 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; |
bac8dca9 | 3915 | if (mp->m_sb_bp) |
b0388bf1 | 3916 | mp->m_sb_bp->b_flags |= XBF_DONE; |
bac8dca9 | 3917 | |
1da177e4 | 3918 | /* |
a870fe6d DC |
3919 | * Mark the log and the iclogs with IO error flags to prevent any |
3920 | * further log IO from being issued or completed. | |
1da177e4 LT |
3921 | */ |
3922 | log->l_flags |= XLOG_IO_ERROR; | |
a870fe6d | 3923 | retval = xlog_state_ioerror(log); |
b22cd72c | 3924 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3925 | |
3926 | /* | |
10547941 DC |
3927 | * We don't want anybody waiting for log reservations after this. That |
3928 | * means we have to wake up everybody queued up on reserveq as well as | |
3929 | * writeq. In addition, we make sure in xlog_{re}grant_log_space that | |
3930 | * we don't enqueue anything once the SHUTDOWN flag is set, and this | |
3f16b985 | 3931 | * action is protected by the grant locks. |
1da177e4 | 3932 | */ |
a79bf2d7 CH |
3933 | xlog_grant_head_wake_all(&log->l_reserve_head); |
3934 | xlog_grant_head_wake_all(&log->l_write_head); | |
1da177e4 | 3935 | |
1da177e4 | 3936 | /* |
ac983517 DC |
3937 | * Wake up everybody waiting on xfs_log_force. Wake the CIL push first |
3938 | * as if the log writes were completed. The abort handling in the log | |
3939 | * item committed callback functions will do this again under lock to | |
3940 | * avoid races. | |
1da177e4 | 3941 | */ |
cdea5459 | 3942 | spin_lock(&log->l_cilp->xc_push_lock); |
ac983517 | 3943 | wake_up_all(&log->l_cilp->xc_commit_wait); |
cdea5459 | 3944 | spin_unlock(&log->l_cilp->xc_push_lock); |
4b29ab04 | 3945 | xlog_state_do_callback(log, true); |
1da177e4 | 3946 | |
1da177e4 | 3947 | /* return non-zero if log IOERROR transition had already happened */ |
014c2544 | 3948 | return retval; |
1da177e4 LT |
3949 | } |
3950 | ||
ba0f32d4 | 3951 | STATIC int |
9a8d2fdb MT |
3952 | xlog_iclogs_empty( |
3953 | struct xlog *log) | |
1da177e4 LT |
3954 | { |
3955 | xlog_in_core_t *iclog; | |
3956 | ||
3957 | iclog = log->l_iclog; | |
3958 | do { | |
3959 | /* endianness does not matter here, zero is zero in | |
3960 | * any language. | |
3961 | */ | |
3962 | if (iclog->ic_header.h_num_logops) | |
014c2544 | 3963 | return 0; |
1da177e4 LT |
3964 | iclog = iclog->ic_next; |
3965 | } while (iclog != log->l_iclog); | |
014c2544 | 3966 | return 1; |
1da177e4 | 3967 | } |
f661f1e0 | 3968 | |
a45086e2 BF |
3969 | /* |
3970 | * Verify that an LSN stamped into a piece of metadata is valid. This is | |
3971 | * intended for use in read verifiers on v5 superblocks. | |
3972 | */ | |
3973 | bool | |
3974 | xfs_log_check_lsn( | |
3975 | struct xfs_mount *mp, | |
3976 | xfs_lsn_t lsn) | |
3977 | { | |
3978 | struct xlog *log = mp->m_log; | |
3979 | bool valid; | |
3980 | ||
3981 | /* | |
3982 | * norecovery mode skips mount-time log processing and unconditionally | |
3983 | * resets the in-core LSN. We can't validate in this mode, but | |
3984 | * modifications are not allowed anyways so just return true. | |
3985 | */ | |
3986 | if (mp->m_flags & XFS_MOUNT_NORECOVERY) | |
3987 | return true; | |
3988 | ||
3989 | /* | |
3990 | * Some metadata LSNs are initialized to NULL (e.g., the agfl). This is | |
3991 | * handled by recovery and thus safe to ignore here. | |
3992 | */ | |
3993 | if (lsn == NULLCOMMITLSN) | |
3994 | return true; | |
3995 | ||
3996 | valid = xlog_valid_lsn(mp->m_log, lsn); | |
3997 | ||
3998 | /* warn the user about what's gone wrong before verifier failure */ | |
3999 | if (!valid) { | |
4000 | spin_lock(&log->l_icloglock); | |
4001 | xfs_warn(mp, | |
4002 | "Corruption warning: Metadata has LSN (%d:%d) ahead of current LSN (%d:%d). " | |
4003 | "Please unmount and run xfs_repair (>= v4.3) to resolve.", | |
4004 | CYCLE_LSN(lsn), BLOCK_LSN(lsn), | |
4005 | log->l_curr_cycle, log->l_curr_block); | |
4006 | spin_unlock(&log->l_icloglock); | |
4007 | } | |
4008 | ||
4009 | return valid; | |
4010 | } | |
0c60d3aa DW |
4011 | |
4012 | bool | |
4013 | xfs_log_in_recovery( | |
4014 | struct xfs_mount *mp) | |
4015 | { | |
4016 | struct xlog *log = mp->m_log; | |
4017 | ||
4018 | return log->l_flags & XLOG_ACTIVE_RECOVERY; | |
4019 | } |