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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); | |
60 | STATIC int | |
61 | xlog_state_release_iclog( | |
62 | struct xlog *log, | |
63 | struct xlog_in_core *iclog); | |
64 | STATIC void | |
65 | xlog_state_switch_iclogs( | |
66 | struct xlog *log, | |
67 | struct xlog_in_core *iclog, | |
68 | int eventual_size); | |
69 | STATIC void | |
70 | xlog_state_want_sync( | |
71 | struct xlog *log, | |
72 | struct xlog_in_core *iclog); | |
1da177e4 | 73 | |
ad223e60 MT |
74 | STATIC void |
75 | xlog_grant_push_ail( | |
9a8d2fdb MT |
76 | struct xlog *log, |
77 | int need_bytes); | |
78 | STATIC void | |
79 | xlog_regrant_reserve_log_space( | |
80 | struct xlog *log, | |
81 | struct xlog_ticket *ticket); | |
82 | STATIC void | |
83 | xlog_ungrant_log_space( | |
84 | struct xlog *log, | |
85 | struct xlog_ticket *ticket); | |
1da177e4 | 86 | |
cfcbbbd0 | 87 | #if defined(DEBUG) |
9a8d2fdb MT |
88 | STATIC void |
89 | xlog_verify_dest_ptr( | |
90 | struct xlog *log, | |
5809d5e0 | 91 | void *ptr); |
ad223e60 MT |
92 | STATIC void |
93 | xlog_verify_grant_tail( | |
9a8d2fdb MT |
94 | struct xlog *log); |
95 | STATIC void | |
96 | xlog_verify_iclog( | |
97 | struct xlog *log, | |
98 | struct xlog_in_core *iclog, | |
abca1f33 | 99 | int count); |
9a8d2fdb MT |
100 | STATIC void |
101 | xlog_verify_tail_lsn( | |
102 | struct xlog *log, | |
103 | struct xlog_in_core *iclog, | |
104 | xfs_lsn_t tail_lsn); | |
1da177e4 LT |
105 | #else |
106 | #define xlog_verify_dest_ptr(a,b) | |
3f336c6f | 107 | #define xlog_verify_grant_tail(a) |
abca1f33 | 108 | #define xlog_verify_iclog(a,b,c) |
1da177e4 LT |
109 | #define xlog_verify_tail_lsn(a,b,c) |
110 | #endif | |
111 | ||
9a8d2fdb MT |
112 | STATIC int |
113 | xlog_iclogs_empty( | |
114 | struct xlog *log); | |
1da177e4 | 115 | |
dd954c69 | 116 | static void |
663e496a | 117 | xlog_grant_sub_space( |
ad223e60 MT |
118 | struct xlog *log, |
119 | atomic64_t *head, | |
120 | int bytes) | |
dd954c69 | 121 | { |
d0eb2f38 DC |
122 | int64_t head_val = atomic64_read(head); |
123 | int64_t new, old; | |
a69ed03c | 124 | |
d0eb2f38 DC |
125 | do { |
126 | int cycle, space; | |
a69ed03c | 127 | |
d0eb2f38 | 128 | xlog_crack_grant_head_val(head_val, &cycle, &space); |
a69ed03c | 129 | |
d0eb2f38 DC |
130 | space -= bytes; |
131 | if (space < 0) { | |
132 | space += log->l_logsize; | |
133 | cycle--; | |
134 | } | |
135 | ||
136 | old = head_val; | |
137 | new = xlog_assign_grant_head_val(cycle, space); | |
138 | head_val = atomic64_cmpxchg(head, old, new); | |
139 | } while (head_val != old); | |
dd954c69 CH |
140 | } |
141 | ||
142 | static void | |
663e496a | 143 | xlog_grant_add_space( |
ad223e60 MT |
144 | struct xlog *log, |
145 | atomic64_t *head, | |
146 | int bytes) | |
dd954c69 | 147 | { |
d0eb2f38 DC |
148 | int64_t head_val = atomic64_read(head); |
149 | int64_t new, old; | |
a69ed03c | 150 | |
d0eb2f38 DC |
151 | do { |
152 | int tmp; | |
153 | int cycle, space; | |
a69ed03c | 154 | |
d0eb2f38 | 155 | xlog_crack_grant_head_val(head_val, &cycle, &space); |
a69ed03c | 156 | |
d0eb2f38 DC |
157 | tmp = log->l_logsize - space; |
158 | if (tmp > bytes) | |
159 | space += bytes; | |
160 | else { | |
161 | space = bytes - tmp; | |
162 | cycle++; | |
163 | } | |
164 | ||
165 | old = head_val; | |
166 | new = xlog_assign_grant_head_val(cycle, space); | |
167 | head_val = atomic64_cmpxchg(head, old, new); | |
168 | } while (head_val != old); | |
dd954c69 | 169 | } |
a69ed03c | 170 | |
c303c5b8 CH |
171 | STATIC void |
172 | xlog_grant_head_init( | |
173 | struct xlog_grant_head *head) | |
174 | { | |
175 | xlog_assign_grant_head(&head->grant, 1, 0); | |
176 | INIT_LIST_HEAD(&head->waiters); | |
177 | spin_lock_init(&head->lock); | |
178 | } | |
179 | ||
a79bf2d7 CH |
180 | STATIC void |
181 | xlog_grant_head_wake_all( | |
182 | struct xlog_grant_head *head) | |
183 | { | |
184 | struct xlog_ticket *tic; | |
185 | ||
186 | spin_lock(&head->lock); | |
187 | list_for_each_entry(tic, &head->waiters, t_queue) | |
188 | wake_up_process(tic->t_task); | |
189 | spin_unlock(&head->lock); | |
190 | } | |
191 | ||
e179840d CH |
192 | static inline int |
193 | xlog_ticket_reservation( | |
ad223e60 | 194 | struct xlog *log, |
e179840d CH |
195 | struct xlog_grant_head *head, |
196 | struct xlog_ticket *tic) | |
9f9c19ec | 197 | { |
e179840d CH |
198 | if (head == &log->l_write_head) { |
199 | ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); | |
200 | return tic->t_unit_res; | |
201 | } else { | |
9f9c19ec | 202 | if (tic->t_flags & XLOG_TIC_PERM_RESERV) |
e179840d | 203 | return tic->t_unit_res * tic->t_cnt; |
9f9c19ec | 204 | else |
e179840d | 205 | return tic->t_unit_res; |
9f9c19ec | 206 | } |
9f9c19ec CH |
207 | } |
208 | ||
209 | STATIC bool | |
e179840d | 210 | xlog_grant_head_wake( |
ad223e60 | 211 | struct xlog *log, |
e179840d | 212 | struct xlog_grant_head *head, |
9f9c19ec CH |
213 | int *free_bytes) |
214 | { | |
215 | struct xlog_ticket *tic; | |
216 | int need_bytes; | |
217 | ||
e179840d CH |
218 | list_for_each_entry(tic, &head->waiters, t_queue) { |
219 | need_bytes = xlog_ticket_reservation(log, head, tic); | |
9f9c19ec CH |
220 | if (*free_bytes < need_bytes) |
221 | return false; | |
9f9c19ec | 222 | |
e179840d CH |
223 | *free_bytes -= need_bytes; |
224 | trace_xfs_log_grant_wake_up(log, tic); | |
14a7235f | 225 | wake_up_process(tic->t_task); |
9f9c19ec CH |
226 | } |
227 | ||
228 | return true; | |
229 | } | |
230 | ||
231 | STATIC int | |
23ee3df3 | 232 | xlog_grant_head_wait( |
ad223e60 | 233 | struct xlog *log, |
23ee3df3 | 234 | struct xlog_grant_head *head, |
9f9c19ec | 235 | struct xlog_ticket *tic, |
a30b0367 DC |
236 | int need_bytes) __releases(&head->lock) |
237 | __acquires(&head->lock) | |
9f9c19ec | 238 | { |
23ee3df3 | 239 | list_add_tail(&tic->t_queue, &head->waiters); |
9f9c19ec CH |
240 | |
241 | do { | |
242 | if (XLOG_FORCED_SHUTDOWN(log)) | |
243 | goto shutdown; | |
244 | xlog_grant_push_ail(log, need_bytes); | |
245 | ||
14a7235f | 246 | __set_current_state(TASK_UNINTERRUPTIBLE); |
23ee3df3 | 247 | spin_unlock(&head->lock); |
14a7235f | 248 | |
ff6d6af2 | 249 | XFS_STATS_INC(log->l_mp, xs_sleep_logspace); |
9f9c19ec | 250 | |
14a7235f CH |
251 | trace_xfs_log_grant_sleep(log, tic); |
252 | schedule(); | |
9f9c19ec CH |
253 | trace_xfs_log_grant_wake(log, tic); |
254 | ||
23ee3df3 | 255 | spin_lock(&head->lock); |
9f9c19ec CH |
256 | if (XLOG_FORCED_SHUTDOWN(log)) |
257 | goto shutdown; | |
23ee3df3 | 258 | } while (xlog_space_left(log, &head->grant) < need_bytes); |
9f9c19ec CH |
259 | |
260 | list_del_init(&tic->t_queue); | |
261 | return 0; | |
262 | shutdown: | |
263 | list_del_init(&tic->t_queue); | |
2451337d | 264 | return -EIO; |
9f9c19ec CH |
265 | } |
266 | ||
42ceedb3 CH |
267 | /* |
268 | * Atomically get the log space required for a log ticket. | |
269 | * | |
270 | * Once a ticket gets put onto head->waiters, it will only return after the | |
271 | * needed reservation is satisfied. | |
272 | * | |
273 | * This function is structured so that it has a lock free fast path. This is | |
274 | * necessary because every new transaction reservation will come through this | |
275 | * path. Hence any lock will be globally hot if we take it unconditionally on | |
276 | * every pass. | |
277 | * | |
278 | * As tickets are only ever moved on and off head->waiters under head->lock, we | |
279 | * only need to take that lock if we are going to add the ticket to the queue | |
280 | * and sleep. We can avoid taking the lock if the ticket was never added to | |
281 | * head->waiters because the t_queue list head will be empty and we hold the | |
282 | * only reference to it so it can safely be checked unlocked. | |
283 | */ | |
284 | STATIC int | |
285 | xlog_grant_head_check( | |
ad223e60 | 286 | struct xlog *log, |
42ceedb3 CH |
287 | struct xlog_grant_head *head, |
288 | struct xlog_ticket *tic, | |
289 | int *need_bytes) | |
290 | { | |
291 | int free_bytes; | |
292 | int error = 0; | |
293 | ||
294 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); | |
295 | ||
296 | /* | |
297 | * If there are other waiters on the queue then give them a chance at | |
298 | * logspace before us. Wake up the first waiters, if we do not wake | |
299 | * up all the waiters then go to sleep waiting for more free space, | |
300 | * otherwise try to get some space for this transaction. | |
301 | */ | |
302 | *need_bytes = xlog_ticket_reservation(log, head, tic); | |
303 | free_bytes = xlog_space_left(log, &head->grant); | |
304 | if (!list_empty_careful(&head->waiters)) { | |
305 | spin_lock(&head->lock); | |
306 | if (!xlog_grant_head_wake(log, head, &free_bytes) || | |
307 | free_bytes < *need_bytes) { | |
308 | error = xlog_grant_head_wait(log, head, tic, | |
309 | *need_bytes); | |
310 | } | |
311 | spin_unlock(&head->lock); | |
312 | } else if (free_bytes < *need_bytes) { | |
313 | spin_lock(&head->lock); | |
314 | error = xlog_grant_head_wait(log, head, tic, *need_bytes); | |
315 | spin_unlock(&head->lock); | |
316 | } | |
317 | ||
318 | return error; | |
319 | } | |
320 | ||
0adba536 CH |
321 | static void |
322 | xlog_tic_reset_res(xlog_ticket_t *tic) | |
323 | { | |
324 | tic->t_res_num = 0; | |
325 | tic->t_res_arr_sum = 0; | |
326 | tic->t_res_num_ophdrs = 0; | |
327 | } | |
328 | ||
329 | static void | |
330 | xlog_tic_add_region(xlog_ticket_t *tic, uint len, uint type) | |
331 | { | |
332 | if (tic->t_res_num == XLOG_TIC_LEN_MAX) { | |
333 | /* add to overflow and start again */ | |
334 | tic->t_res_o_flow += tic->t_res_arr_sum; | |
335 | tic->t_res_num = 0; | |
336 | tic->t_res_arr_sum = 0; | |
337 | } | |
338 | ||
339 | tic->t_res_arr[tic->t_res_num].r_len = len; | |
340 | tic->t_res_arr[tic->t_res_num].r_type = type; | |
341 | tic->t_res_arr_sum += len; | |
342 | tic->t_res_num++; | |
343 | } | |
dd954c69 | 344 | |
9006fb91 CH |
345 | /* |
346 | * Replenish the byte reservation required by moving the grant write head. | |
347 | */ | |
348 | int | |
349 | xfs_log_regrant( | |
350 | struct xfs_mount *mp, | |
351 | struct xlog_ticket *tic) | |
352 | { | |
ad223e60 | 353 | struct xlog *log = mp->m_log; |
9006fb91 CH |
354 | int need_bytes; |
355 | int error = 0; | |
356 | ||
357 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2451337d | 358 | return -EIO; |
9006fb91 | 359 | |
ff6d6af2 | 360 | XFS_STATS_INC(mp, xs_try_logspace); |
9006fb91 CH |
361 | |
362 | /* | |
363 | * This is a new transaction on the ticket, so we need to change the | |
364 | * transaction ID so that the next transaction has a different TID in | |
365 | * the log. Just add one to the existing tid so that we can see chains | |
366 | * of rolling transactions in the log easily. | |
367 | */ | |
368 | tic->t_tid++; | |
369 | ||
370 | xlog_grant_push_ail(log, tic->t_unit_res); | |
371 | ||
372 | tic->t_curr_res = tic->t_unit_res; | |
373 | xlog_tic_reset_res(tic); | |
374 | ||
375 | if (tic->t_cnt > 0) | |
376 | return 0; | |
377 | ||
378 | trace_xfs_log_regrant(log, tic); | |
379 | ||
380 | error = xlog_grant_head_check(log, &log->l_write_head, tic, | |
381 | &need_bytes); | |
382 | if (error) | |
383 | goto out_error; | |
384 | ||
385 | xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes); | |
386 | trace_xfs_log_regrant_exit(log, tic); | |
387 | xlog_verify_grant_tail(log); | |
388 | return 0; | |
389 | ||
390 | out_error: | |
391 | /* | |
392 | * If we are failing, make sure the ticket doesn't have any current | |
393 | * reservations. We don't want to add this back when the ticket/ | |
394 | * transaction gets cancelled. | |
395 | */ | |
396 | tic->t_curr_res = 0; | |
397 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
398 | return error; | |
399 | } | |
400 | ||
401 | /* | |
a0e336ba | 402 | * Reserve log space and return a ticket corresponding to the reservation. |
9006fb91 CH |
403 | * |
404 | * Each reservation is going to reserve extra space for a log record header. | |
405 | * When writes happen to the on-disk log, we don't subtract the length of the | |
406 | * log record header from any reservation. By wasting space in each | |
407 | * reservation, we prevent over allocation problems. | |
408 | */ | |
409 | int | |
410 | xfs_log_reserve( | |
411 | struct xfs_mount *mp, | |
412 | int unit_bytes, | |
413 | int cnt, | |
414 | struct xlog_ticket **ticp, | |
c8ce540d | 415 | uint8_t client, |
710b1e2c | 416 | bool permanent) |
9006fb91 | 417 | { |
ad223e60 | 418 | struct xlog *log = mp->m_log; |
9006fb91 CH |
419 | struct xlog_ticket *tic; |
420 | int need_bytes; | |
421 | int error = 0; | |
422 | ||
423 | ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); | |
424 | ||
425 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2451337d | 426 | return -EIO; |
9006fb91 | 427 | |
ff6d6af2 | 428 | XFS_STATS_INC(mp, xs_try_logspace); |
9006fb91 CH |
429 | |
430 | ASSERT(*ticp == NULL); | |
707e0dda | 431 | tic = xlog_ticket_alloc(log, unit_bytes, cnt, client, permanent, 0); |
9006fb91 CH |
432 | *ticp = tic; |
433 | ||
437a255a DC |
434 | xlog_grant_push_ail(log, tic->t_cnt ? tic->t_unit_res * tic->t_cnt |
435 | : tic->t_unit_res); | |
9006fb91 CH |
436 | |
437 | trace_xfs_log_reserve(log, tic); | |
438 | ||
439 | error = xlog_grant_head_check(log, &log->l_reserve_head, tic, | |
440 | &need_bytes); | |
441 | if (error) | |
442 | goto out_error; | |
443 | ||
444 | xlog_grant_add_space(log, &log->l_reserve_head.grant, need_bytes); | |
445 | xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes); | |
446 | trace_xfs_log_reserve_exit(log, tic); | |
447 | xlog_verify_grant_tail(log); | |
448 | return 0; | |
449 | ||
450 | out_error: | |
451 | /* | |
452 | * If we are failing, make sure the ticket doesn't have any current | |
453 | * reservations. We don't want to add this back when the ticket/ | |
454 | * transaction gets cancelled. | |
455 | */ | |
456 | tic->t_curr_res = 0; | |
457 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
458 | return error; | |
459 | } | |
460 | ||
461 | ||
1da177e4 LT |
462 | /* |
463 | * NOTES: | |
464 | * | |
465 | * 1. currblock field gets updated at startup and after in-core logs | |
466 | * marked as with WANT_SYNC. | |
467 | */ | |
468 | ||
469 | /* | |
470 | * This routine is called when a user of a log manager ticket is done with | |
471 | * the reservation. If the ticket was ever used, then a commit record for | |
472 | * the associated transaction is written out as a log operation header with | |
473 | * no data. The flag XLOG_TIC_INITED is set when the first write occurs with | |
474 | * a given ticket. If the ticket was one with a permanent reservation, then | |
475 | * a few operations are done differently. Permanent reservation tickets by | |
476 | * default don't release the reservation. They just commit the current | |
477 | * transaction with the belief that the reservation is still needed. A flag | |
478 | * must be passed in before permanent reservations are actually released. | |
479 | * When these type of tickets are not released, they need to be set into | |
480 | * the inited state again. By doing this, a start record will be written | |
481 | * out when the next write occurs. | |
482 | */ | |
483 | xfs_lsn_t | |
35a8a72f CH |
484 | xfs_log_done( |
485 | struct xfs_mount *mp, | |
486 | struct xlog_ticket *ticket, | |
487 | struct xlog_in_core **iclog, | |
f78c3901 | 488 | bool regrant) |
1da177e4 | 489 | { |
ad223e60 | 490 | struct xlog *log = mp->m_log; |
35a8a72f | 491 | xfs_lsn_t lsn = 0; |
1da177e4 | 492 | |
1da177e4 LT |
493 | if (XLOG_FORCED_SHUTDOWN(log) || |
494 | /* | |
495 | * If nothing was ever written, don't write out commit record. | |
496 | * If we get an error, just continue and give back the log ticket. | |
497 | */ | |
498 | (((ticket->t_flags & XLOG_TIC_INITED) == 0) && | |
55b66332 | 499 | (xlog_commit_record(log, ticket, iclog, &lsn)))) { |
1da177e4 | 500 | lsn = (xfs_lsn_t) -1; |
f78c3901 | 501 | regrant = false; |
1da177e4 LT |
502 | } |
503 | ||
504 | ||
f78c3901 | 505 | if (!regrant) { |
0b1b213f CH |
506 | trace_xfs_log_done_nonperm(log, ticket); |
507 | ||
1da177e4 | 508 | /* |
c41564b5 | 509 | * Release ticket if not permanent reservation or a specific |
1da177e4 LT |
510 | * request has been made to release a permanent reservation. |
511 | */ | |
512 | xlog_ungrant_log_space(log, ticket); | |
1da177e4 | 513 | } else { |
0b1b213f CH |
514 | trace_xfs_log_done_perm(log, ticket); |
515 | ||
1da177e4 | 516 | xlog_regrant_reserve_log_space(log, ticket); |
c6a7b0f8 LM |
517 | /* If this ticket was a permanent reservation and we aren't |
518 | * trying to release it, reset the inited flags; so next time | |
519 | * we write, a start record will be written out. | |
520 | */ | |
1da177e4 | 521 | ticket->t_flags |= XLOG_TIC_INITED; |
c6a7b0f8 | 522 | } |
1da177e4 | 523 | |
f78c3901 | 524 | xfs_log_ticket_put(ticket); |
1da177e4 | 525 | return lsn; |
35a8a72f | 526 | } |
1da177e4 | 527 | |
1da177e4 | 528 | int |
35a8a72f CH |
529 | xfs_log_release_iclog( |
530 | struct xfs_mount *mp, | |
531 | struct xlog_in_core *iclog) | |
1da177e4 | 532 | { |
35a8a72f | 533 | if (xlog_state_release_iclog(mp->m_log, iclog)) { |
7d04a335 | 534 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
2451337d | 535 | return -EIO; |
1da177e4 LT |
536 | } |
537 | ||
538 | return 0; | |
539 | } | |
540 | ||
1da177e4 LT |
541 | /* |
542 | * Mount a log filesystem | |
543 | * | |
544 | * mp - ubiquitous xfs mount point structure | |
545 | * log_target - buftarg of on-disk log device | |
546 | * blk_offset - Start block # where block size is 512 bytes (BBSIZE) | |
547 | * num_bblocks - Number of BBSIZE blocks in on-disk log | |
548 | * | |
549 | * Return error or zero. | |
550 | */ | |
551 | int | |
249a8c11 DC |
552 | xfs_log_mount( |
553 | xfs_mount_t *mp, | |
554 | xfs_buftarg_t *log_target, | |
555 | xfs_daddr_t blk_offset, | |
556 | int num_bblks) | |
1da177e4 | 557 | { |
9c92ee20 | 558 | bool fatal = xfs_sb_version_hascrc(&mp->m_sb); |
3e7b91cf JL |
559 | int error = 0; |
560 | int min_logfsbs; | |
249a8c11 | 561 | |
c99d609a DC |
562 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { |
563 | xfs_notice(mp, "Mounting V%d Filesystem", | |
564 | XFS_SB_VERSION_NUM(&mp->m_sb)); | |
565 | } else { | |
a0fa2b67 | 566 | xfs_notice(mp, |
c99d609a DC |
567 | "Mounting V%d filesystem in no-recovery mode. Filesystem will be inconsistent.", |
568 | XFS_SB_VERSION_NUM(&mp->m_sb)); | |
bd186aa9 | 569 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
570 | } |
571 | ||
572 | mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); | |
a6cb767e | 573 | if (IS_ERR(mp->m_log)) { |
2451337d | 574 | error = PTR_ERR(mp->m_log); |
644c3567 DC |
575 | goto out; |
576 | } | |
1da177e4 | 577 | |
3e7b91cf JL |
578 | /* |
579 | * Validate the given log space and drop a critical message via syslog | |
580 | * if the log size is too small that would lead to some unexpected | |
581 | * situations in transaction log space reservation stage. | |
582 | * | |
583 | * Note: we can't just reject the mount if the validation fails. This | |
584 | * would mean that people would have to downgrade their kernel just to | |
585 | * remedy the situation as there is no way to grow the log (short of | |
586 | * black magic surgery with xfs_db). | |
587 | * | |
588 | * We can, however, reject mounts for CRC format filesystems, as the | |
589 | * mkfs binary being used to make the filesystem should never create a | |
590 | * filesystem with a log that is too small. | |
591 | */ | |
592 | min_logfsbs = xfs_log_calc_minimum_size(mp); | |
593 | ||
594 | if (mp->m_sb.sb_logblocks < min_logfsbs) { | |
595 | xfs_warn(mp, | |
596 | "Log size %d blocks too small, minimum size is %d blocks", | |
597 | mp->m_sb.sb_logblocks, min_logfsbs); | |
2451337d | 598 | error = -EINVAL; |
3e7b91cf JL |
599 | } else if (mp->m_sb.sb_logblocks > XFS_MAX_LOG_BLOCKS) { |
600 | xfs_warn(mp, | |
601 | "Log size %d blocks too large, maximum size is %lld blocks", | |
602 | mp->m_sb.sb_logblocks, XFS_MAX_LOG_BLOCKS); | |
2451337d | 603 | error = -EINVAL; |
3e7b91cf JL |
604 | } else if (XFS_FSB_TO_B(mp, mp->m_sb.sb_logblocks) > XFS_MAX_LOG_BYTES) { |
605 | xfs_warn(mp, | |
606 | "log size %lld bytes too large, maximum size is %lld bytes", | |
607 | XFS_FSB_TO_B(mp, mp->m_sb.sb_logblocks), | |
608 | XFS_MAX_LOG_BYTES); | |
2451337d | 609 | error = -EINVAL; |
9c92ee20 DW |
610 | } else if (mp->m_sb.sb_logsunit > 1 && |
611 | mp->m_sb.sb_logsunit % mp->m_sb.sb_blocksize) { | |
612 | xfs_warn(mp, | |
613 | "log stripe unit %u bytes must be a multiple of block size", | |
614 | mp->m_sb.sb_logsunit); | |
615 | error = -EINVAL; | |
616 | fatal = true; | |
3e7b91cf JL |
617 | } |
618 | if (error) { | |
9c92ee20 DW |
619 | /* |
620 | * Log check errors are always fatal on v5; or whenever bad | |
621 | * metadata leads to a crash. | |
622 | */ | |
623 | if (fatal) { | |
3e7b91cf JL |
624 | xfs_crit(mp, "AAIEEE! Log failed size checks. Abort!"); |
625 | ASSERT(0); | |
626 | goto out_free_log; | |
627 | } | |
f41febd2 | 628 | xfs_crit(mp, "Log size out of supported range."); |
3e7b91cf | 629 | xfs_crit(mp, |
f41febd2 | 630 | "Continuing onwards, but if log hangs are experienced then please report this message in the bug report."); |
3e7b91cf JL |
631 | } |
632 | ||
249a8c11 DC |
633 | /* |
634 | * Initialize the AIL now we have a log. | |
635 | */ | |
249a8c11 DC |
636 | error = xfs_trans_ail_init(mp); |
637 | if (error) { | |
a0fa2b67 | 638 | xfs_warn(mp, "AIL initialisation failed: error %d", error); |
26430752 | 639 | goto out_free_log; |
249a8c11 | 640 | } |
a9c21c1b | 641 | mp->m_log->l_ailp = mp->m_ail; |
249a8c11 | 642 | |
1da177e4 LT |
643 | /* |
644 | * skip log recovery on a norecovery mount. pretend it all | |
645 | * just worked. | |
646 | */ | |
647 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { | |
249a8c11 | 648 | int readonly = (mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
649 | |
650 | if (readonly) | |
bd186aa9 | 651 | mp->m_flags &= ~XFS_MOUNT_RDONLY; |
1da177e4 | 652 | |
65be6054 | 653 | error = xlog_recover(mp->m_log); |
1da177e4 LT |
654 | |
655 | if (readonly) | |
bd186aa9 | 656 | mp->m_flags |= XFS_MOUNT_RDONLY; |
1da177e4 | 657 | if (error) { |
a0fa2b67 DC |
658 | xfs_warn(mp, "log mount/recovery failed: error %d", |
659 | error); | |
f0b2efad | 660 | xlog_recover_cancel(mp->m_log); |
26430752 | 661 | goto out_destroy_ail; |
1da177e4 LT |
662 | } |
663 | } | |
664 | ||
baff4e44 BF |
665 | error = xfs_sysfs_init(&mp->m_log->l_kobj, &xfs_log_ktype, &mp->m_kobj, |
666 | "log"); | |
667 | if (error) | |
668 | goto out_destroy_ail; | |
669 | ||
1da177e4 LT |
670 | /* Normal transactions can now occur */ |
671 | mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; | |
672 | ||
71e330b5 DC |
673 | /* |
674 | * Now the log has been fully initialised and we know were our | |
675 | * space grant counters are, we can initialise the permanent ticket | |
676 | * needed for delayed logging to work. | |
677 | */ | |
678 | xlog_cil_init_post_recovery(mp->m_log); | |
679 | ||
1da177e4 | 680 | return 0; |
26430752 CH |
681 | |
682 | out_destroy_ail: | |
683 | xfs_trans_ail_destroy(mp); | |
684 | out_free_log: | |
685 | xlog_dealloc_log(mp->m_log); | |
644c3567 | 686 | out: |
249a8c11 | 687 | return error; |
26430752 | 688 | } |
1da177e4 LT |
689 | |
690 | /* | |
f661f1e0 DC |
691 | * Finish the recovery of the file system. This is separate from the |
692 | * xfs_log_mount() call, because it depends on the code in xfs_mountfs() to read | |
693 | * in the root and real-time bitmap inodes between calling xfs_log_mount() and | |
694 | * here. | |
1da177e4 | 695 | * |
f661f1e0 DC |
696 | * If we finish recovery successfully, start the background log work. If we are |
697 | * not doing recovery, then we have a RO filesystem and we don't need to start | |
698 | * it. | |
1da177e4 LT |
699 | */ |
700 | int | |
f0b2efad BF |
701 | xfs_log_mount_finish( |
702 | struct xfs_mount *mp) | |
1da177e4 | 703 | { |
f661f1e0 | 704 | int error = 0; |
6f4a1eef | 705 | bool readonly = (mp->m_flags & XFS_MOUNT_RDONLY); |
f1b92bbc | 706 | bool recovered = mp->m_log->l_flags & XLOG_RECOVERY_NEEDED; |
1da177e4 | 707 | |
f0b2efad | 708 | if (mp->m_flags & XFS_MOUNT_NORECOVERY) { |
bd186aa9 | 709 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
f0b2efad | 710 | return 0; |
6f4a1eef ES |
711 | } else if (readonly) { |
712 | /* Allow unlinked processing to proceed */ | |
713 | mp->m_flags &= ~XFS_MOUNT_RDONLY; | |
1da177e4 LT |
714 | } |
715 | ||
8204f8dd DW |
716 | /* |
717 | * During the second phase of log recovery, we need iget and | |
718 | * iput to behave like they do for an active filesystem. | |
719 | * xfs_fs_drop_inode needs to be able to prevent the deletion | |
720 | * of inodes before we're done replaying log items on those | |
721 | * inodes. Turn it off immediately after recovery finishes | |
722 | * so that we don't leak the quota inodes if subsequent mount | |
723 | * activities fail. | |
799ea9e9 DW |
724 | * |
725 | * We let all inodes involved in redo item processing end up on | |
726 | * the LRU instead of being evicted immediately so that if we do | |
727 | * something to an unlinked inode, the irele won't cause | |
728 | * premature truncation and freeing of the inode, which results | |
729 | * in log recovery failure. We have to evict the unreferenced | |
1751e8a6 | 730 | * lru inodes after clearing SB_ACTIVE because we don't |
799ea9e9 DW |
731 | * otherwise clean up the lru if there's a subsequent failure in |
732 | * xfs_mountfs, which leads to us leaking the inodes if nothing | |
733 | * else (e.g. quotacheck) references the inodes before the | |
734 | * mount failure occurs. | |
8204f8dd | 735 | */ |
1751e8a6 | 736 | mp->m_super->s_flags |= SB_ACTIVE; |
f0b2efad BF |
737 | error = xlog_recover_finish(mp->m_log); |
738 | if (!error) | |
739 | xfs_log_work_queue(mp); | |
1751e8a6 | 740 | mp->m_super->s_flags &= ~SB_ACTIVE; |
799ea9e9 | 741 | evict_inodes(mp->m_super); |
f0b2efad | 742 | |
f1b92bbc BF |
743 | /* |
744 | * Drain the buffer LRU after log recovery. This is required for v4 | |
745 | * filesystems to avoid leaving around buffers with NULL verifier ops, | |
746 | * but we do it unconditionally to make sure we're always in a clean | |
747 | * cache state after mount. | |
748 | * | |
749 | * Don't push in the error case because the AIL may have pending intents | |
750 | * that aren't removed until recovery is cancelled. | |
751 | */ | |
752 | if (!error && recovered) { | |
753 | xfs_log_force(mp, XFS_LOG_SYNC); | |
754 | xfs_ail_push_all_sync(mp->m_ail); | |
755 | } | |
756 | xfs_wait_buftarg(mp->m_ddev_targp); | |
757 | ||
6f4a1eef ES |
758 | if (readonly) |
759 | mp->m_flags |= XFS_MOUNT_RDONLY; | |
760 | ||
f0b2efad BF |
761 | return error; |
762 | } | |
763 | ||
764 | /* | |
765 | * The mount has failed. Cancel the recovery if it hasn't completed and destroy | |
766 | * the log. | |
767 | */ | |
a7a9250e | 768 | void |
f0b2efad BF |
769 | xfs_log_mount_cancel( |
770 | struct xfs_mount *mp) | |
771 | { | |
a7a9250e | 772 | xlog_recover_cancel(mp->m_log); |
f0b2efad | 773 | xfs_log_unmount(mp); |
1da177e4 LT |
774 | } |
775 | ||
1da177e4 LT |
776 | /* |
777 | * Final log writes as part of unmount. | |
778 | * | |
779 | * Mark the filesystem clean as unmount happens. Note that during relocation | |
780 | * this routine needs to be executed as part of source-bag while the | |
781 | * deallocation must not be done until source-end. | |
782 | */ | |
783 | ||
53235f22 DW |
784 | /* Actually write the unmount record to disk. */ |
785 | static void | |
786 | xfs_log_write_unmount_record( | |
787 | struct xfs_mount *mp) | |
788 | { | |
789 | /* the data section must be 32 bit size aligned */ | |
790 | struct xfs_unmount_log_format magic = { | |
791 | .magic = XLOG_UNMOUNT_TYPE, | |
792 | }; | |
793 | struct xfs_log_iovec reg = { | |
794 | .i_addr = &magic, | |
795 | .i_len = sizeof(magic), | |
796 | .i_type = XLOG_REG_TYPE_UNMOUNT, | |
797 | }; | |
798 | struct xfs_log_vec vec = { | |
799 | .lv_niovecs = 1, | |
800 | .lv_iovecp = ®, | |
801 | }; | |
802 | struct xlog *log = mp->m_log; | |
803 | struct xlog_in_core *iclog; | |
804 | struct xlog_ticket *tic = NULL; | |
805 | xfs_lsn_t lsn; | |
f467cad9 | 806 | uint flags = XLOG_UNMOUNT_TRANS; |
53235f22 DW |
807 | int error; |
808 | ||
809 | error = xfs_log_reserve(mp, 600, 1, &tic, XFS_LOG, 0); | |
810 | if (error) | |
811 | goto out_err; | |
812 | ||
f467cad9 DW |
813 | /* |
814 | * If we think the summary counters are bad, clear the unmount header | |
815 | * flag in the unmount record so that the summary counters will be | |
816 | * recalculated during log recovery at next mount. Refer to | |
817 | * xlog_check_unmount_rec for more details. | |
818 | */ | |
39353ff6 | 819 | if (XFS_TEST_ERROR(xfs_fs_has_sickness(mp, XFS_SICK_FS_COUNTERS), mp, |
f467cad9 DW |
820 | XFS_ERRTAG_FORCE_SUMMARY_RECALC)) { |
821 | xfs_alert(mp, "%s: will fix summary counters at next mount", | |
822 | __func__); | |
823 | flags &= ~XLOG_UNMOUNT_TRANS; | |
824 | } | |
825 | ||
53235f22 DW |
826 | /* remove inited flag, and account for space used */ |
827 | tic->t_flags = 0; | |
828 | tic->t_curr_res -= sizeof(magic); | |
f467cad9 | 829 | error = xlog_write(log, &vec, tic, &lsn, NULL, flags); |
53235f22 DW |
830 | /* |
831 | * At this point, we're umounting anyway, so there's no point in | |
832 | * transitioning log state to IOERROR. Just continue... | |
833 | */ | |
834 | out_err: | |
835 | if (error) | |
836 | xfs_alert(mp, "%s: unmount record failed", __func__); | |
837 | ||
838 | spin_lock(&log->l_icloglock); | |
839 | iclog = log->l_iclog; | |
840 | atomic_inc(&iclog->ic_refcnt); | |
841 | xlog_state_want_sync(log, iclog); | |
842 | spin_unlock(&log->l_icloglock); | |
843 | error = xlog_state_release_iclog(log, iclog); | |
844 | ||
845 | spin_lock(&log->l_icloglock); | |
846 | switch (iclog->ic_state) { | |
847 | default: | |
848 | if (!XLOG_FORCED_SHUTDOWN(log)) { | |
849 | xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); | |
850 | break; | |
851 | } | |
852 | /* fall through */ | |
853 | case XLOG_STATE_ACTIVE: | |
854 | case XLOG_STATE_DIRTY: | |
855 | spin_unlock(&log->l_icloglock); | |
856 | break; | |
857 | } | |
858 | ||
859 | if (tic) { | |
860 | trace_xfs_log_umount_write(log, tic); | |
861 | xlog_ungrant_log_space(log, tic); | |
862 | xfs_log_ticket_put(tic); | |
863 | } | |
864 | } | |
865 | ||
1da177e4 LT |
866 | /* |
867 | * Unmount record used to have a string "Unmount filesystem--" in the | |
868 | * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE). | |
869 | * We just write the magic number now since that particular field isn't | |
8e159e72 | 870 | * currently architecture converted and "Unmount" is a bit foo. |
1da177e4 LT |
871 | * As far as I know, there weren't any dependencies on the old behaviour. |
872 | */ | |
873 | ||
0d5a75e9 | 874 | static int |
1da177e4 LT |
875 | xfs_log_unmount_write(xfs_mount_t *mp) |
876 | { | |
9a8d2fdb | 877 | struct xlog *log = mp->m_log; |
1da177e4 LT |
878 | xlog_in_core_t *iclog; |
879 | #ifdef DEBUG | |
880 | xlog_in_core_t *first_iclog; | |
881 | #endif | |
1da177e4 | 882 | int error; |
1da177e4 | 883 | |
1da177e4 | 884 | /* |
757a69ef | 885 | * Don't write out unmount record on norecovery mounts or ro devices. |
1da177e4 LT |
886 | * Or, if we are doing a forced umount (typically because of IO errors). |
887 | */ | |
757a69ef | 888 | if (mp->m_flags & XFS_MOUNT_NORECOVERY || |
2d15d2c0 | 889 | xfs_readonly_buftarg(log->l_targ)) { |
757a69ef | 890 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 | 891 | return 0; |
757a69ef | 892 | } |
1da177e4 | 893 | |
60e5bb78 | 894 | error = xfs_log_force(mp, XFS_LOG_SYNC); |
b911ca04 | 895 | ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log))); |
1da177e4 LT |
896 | |
897 | #ifdef DEBUG | |
898 | first_iclog = iclog = log->l_iclog; | |
899 | do { | |
900 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
901 | ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE); | |
902 | ASSERT(iclog->ic_offset == 0); | |
903 | } | |
904 | iclog = iclog->ic_next; | |
905 | } while (iclog != first_iclog); | |
906 | #endif | |
907 | if (! (XLOG_FORCED_SHUTDOWN(log))) { | |
53235f22 | 908 | xfs_log_write_unmount_record(mp); |
1da177e4 LT |
909 | } else { |
910 | /* | |
911 | * We're already in forced_shutdown mode, couldn't | |
912 | * even attempt to write out the unmount transaction. | |
913 | * | |
914 | * Go through the motions of sync'ing and releasing | |
915 | * the iclog, even though no I/O will actually happen, | |
c41564b5 | 916 | * we need to wait for other log I/Os that may already |
1da177e4 LT |
917 | * be in progress. Do this as a separate section of |
918 | * code so we'll know if we ever get stuck here that | |
919 | * we're in this odd situation of trying to unmount | |
920 | * a file system that went into forced_shutdown as | |
921 | * the result of an unmount.. | |
922 | */ | |
b22cd72c | 923 | spin_lock(&log->l_icloglock); |
1da177e4 | 924 | iclog = log->l_iclog; |
155cc6b7 | 925 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 LT |
926 | |
927 | xlog_state_want_sync(log, iclog); | |
39e2defe | 928 | spin_unlock(&log->l_icloglock); |
1bb7d6b5 | 929 | error = xlog_state_release_iclog(log, iclog); |
1da177e4 | 930 | |
b22cd72c | 931 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
932 | |
933 | if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE | |
934 | || iclog->ic_state == XLOG_STATE_DIRTY | |
935 | || iclog->ic_state == XLOG_STATE_IOERROR) ) { | |
936 | ||
eb40a875 DC |
937 | xlog_wait(&iclog->ic_force_wait, |
938 | &log->l_icloglock); | |
1da177e4 | 939 | } else { |
b22cd72c | 940 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
941 | } |
942 | } | |
943 | ||
1bb7d6b5 | 944 | return error; |
1da177e4 LT |
945 | } /* xfs_log_unmount_write */ |
946 | ||
947 | /* | |
c75921a7 | 948 | * Empty the log for unmount/freeze. |
cf2931db DC |
949 | * |
950 | * To do this, we first need to shut down the background log work so it is not | |
951 | * trying to cover the log as we clean up. We then need to unpin all objects in | |
952 | * the log so we can then flush them out. Once they have completed their IO and | |
953 | * run the callbacks removing themselves from the AIL, we can write the unmount | |
c75921a7 | 954 | * record. |
1da177e4 LT |
955 | */ |
956 | void | |
c75921a7 DC |
957 | xfs_log_quiesce( |
958 | struct xfs_mount *mp) | |
1da177e4 | 959 | { |
f661f1e0 | 960 | cancel_delayed_work_sync(&mp->m_log->l_work); |
cf2931db DC |
961 | xfs_log_force(mp, XFS_LOG_SYNC); |
962 | ||
963 | /* | |
964 | * The superblock buffer is uncached and while xfs_ail_push_all_sync() | |
965 | * will push it, xfs_wait_buftarg() will not wait for it. Further, | |
966 | * xfs_buf_iowait() cannot be used because it was pushed with the | |
967 | * XBF_ASYNC flag set, so we need to use a lock/unlock pair to wait for | |
968 | * the IO to complete. | |
969 | */ | |
970 | xfs_ail_push_all_sync(mp->m_ail); | |
971 | xfs_wait_buftarg(mp->m_ddev_targp); | |
972 | xfs_buf_lock(mp->m_sb_bp); | |
973 | xfs_buf_unlock(mp->m_sb_bp); | |
974 | ||
975 | xfs_log_unmount_write(mp); | |
c75921a7 DC |
976 | } |
977 | ||
978 | /* | |
979 | * Shut down and release the AIL and Log. | |
980 | * | |
981 | * During unmount, we need to ensure we flush all the dirty metadata objects | |
982 | * from the AIL so that the log is empty before we write the unmount record to | |
983 | * the log. Once this is done, we can tear down the AIL and the log. | |
984 | */ | |
985 | void | |
986 | xfs_log_unmount( | |
987 | struct xfs_mount *mp) | |
988 | { | |
989 | xfs_log_quiesce(mp); | |
cf2931db | 990 | |
249a8c11 | 991 | xfs_trans_ail_destroy(mp); |
baff4e44 BF |
992 | |
993 | xfs_sysfs_del(&mp->m_log->l_kobj); | |
994 | ||
c41564b5 | 995 | xlog_dealloc_log(mp->m_log); |
1da177e4 LT |
996 | } |
997 | ||
43f5efc5 DC |
998 | void |
999 | xfs_log_item_init( | |
1000 | struct xfs_mount *mp, | |
1001 | struct xfs_log_item *item, | |
1002 | int type, | |
272e42b2 | 1003 | const struct xfs_item_ops *ops) |
43f5efc5 DC |
1004 | { |
1005 | item->li_mountp = mp; | |
1006 | item->li_ailp = mp->m_ail; | |
1007 | item->li_type = type; | |
1008 | item->li_ops = ops; | |
71e330b5 DC |
1009 | item->li_lv = NULL; |
1010 | ||
1011 | INIT_LIST_HEAD(&item->li_ail); | |
1012 | INIT_LIST_HEAD(&item->li_cil); | |
643c8c05 | 1013 | INIT_LIST_HEAD(&item->li_bio_list); |
e6631f85 | 1014 | INIT_LIST_HEAD(&item->li_trans); |
43f5efc5 DC |
1015 | } |
1016 | ||
09a423a3 CH |
1017 | /* |
1018 | * Wake up processes waiting for log space after we have moved the log tail. | |
09a423a3 | 1019 | */ |
1da177e4 | 1020 | void |
09a423a3 | 1021 | xfs_log_space_wake( |
cfb7cdca | 1022 | struct xfs_mount *mp) |
1da177e4 | 1023 | { |
ad223e60 | 1024 | struct xlog *log = mp->m_log; |
cfb7cdca | 1025 | int free_bytes; |
1da177e4 | 1026 | |
1da177e4 LT |
1027 | if (XLOG_FORCED_SHUTDOWN(log)) |
1028 | return; | |
1da177e4 | 1029 | |
28496968 | 1030 | if (!list_empty_careful(&log->l_write_head.waiters)) { |
09a423a3 CH |
1031 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); |
1032 | ||
28496968 CH |
1033 | spin_lock(&log->l_write_head.lock); |
1034 | free_bytes = xlog_space_left(log, &log->l_write_head.grant); | |
e179840d | 1035 | xlog_grant_head_wake(log, &log->l_write_head, &free_bytes); |
28496968 | 1036 | spin_unlock(&log->l_write_head.lock); |
1da177e4 | 1037 | } |
10547941 | 1038 | |
28496968 | 1039 | if (!list_empty_careful(&log->l_reserve_head.waiters)) { |
09a423a3 CH |
1040 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); |
1041 | ||
28496968 CH |
1042 | spin_lock(&log->l_reserve_head.lock); |
1043 | free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); | |
e179840d | 1044 | xlog_grant_head_wake(log, &log->l_reserve_head, &free_bytes); |
28496968 | 1045 | spin_unlock(&log->l_reserve_head.lock); |
1da177e4 | 1046 | } |
3f16b985 | 1047 | } |
1da177e4 LT |
1048 | |
1049 | /* | |
2c6e24ce DC |
1050 | * Determine if we have a transaction that has gone to disk that needs to be |
1051 | * covered. To begin the transition to the idle state firstly the log needs to | |
1052 | * be idle. That means the CIL, the AIL and the iclogs needs to be empty before | |
1053 | * we start attempting to cover the log. | |
b6f8dd49 | 1054 | * |
2c6e24ce DC |
1055 | * Only if we are then in a state where covering is needed, the caller is |
1056 | * informed that dummy transactions are required to move the log into the idle | |
1057 | * state. | |
1058 | * | |
1059 | * If there are any items in the AIl or CIL, then we do not want to attempt to | |
1060 | * cover the log as we may be in a situation where there isn't log space | |
1061 | * available to run a dummy transaction and this can lead to deadlocks when the | |
1062 | * tail of the log is pinned by an item that is modified in the CIL. Hence | |
1063 | * there's no point in running a dummy transaction at this point because we | |
1064 | * can't start trying to idle the log until both the CIL and AIL are empty. | |
1da177e4 | 1065 | */ |
0d5a75e9 | 1066 | static int |
1da177e4 LT |
1067 | xfs_log_need_covered(xfs_mount_t *mp) |
1068 | { | |
9a8d2fdb | 1069 | struct xlog *log = mp->m_log; |
2c6e24ce | 1070 | int needed = 0; |
1da177e4 | 1071 | |
91ee575f | 1072 | if (!xfs_fs_writable(mp, SB_FREEZE_WRITE)) |
1da177e4 LT |
1073 | return 0; |
1074 | ||
2c6e24ce DC |
1075 | if (!xlog_cil_empty(log)) |
1076 | return 0; | |
1077 | ||
b22cd72c | 1078 | spin_lock(&log->l_icloglock); |
b6f8dd49 DC |
1079 | switch (log->l_covered_state) { |
1080 | case XLOG_STATE_COVER_DONE: | |
1081 | case XLOG_STATE_COVER_DONE2: | |
1082 | case XLOG_STATE_COVER_IDLE: | |
1083 | break; | |
1084 | case XLOG_STATE_COVER_NEED: | |
1085 | case XLOG_STATE_COVER_NEED2: | |
2c6e24ce DC |
1086 | if (xfs_ail_min_lsn(log->l_ailp)) |
1087 | break; | |
1088 | if (!xlog_iclogs_empty(log)) | |
1089 | break; | |
1090 | ||
1091 | needed = 1; | |
1092 | if (log->l_covered_state == XLOG_STATE_COVER_NEED) | |
1093 | log->l_covered_state = XLOG_STATE_COVER_DONE; | |
1094 | else | |
1095 | log->l_covered_state = XLOG_STATE_COVER_DONE2; | |
1096 | break; | |
b6f8dd49 | 1097 | default: |
1da177e4 | 1098 | needed = 1; |
b6f8dd49 | 1099 | break; |
1da177e4 | 1100 | } |
b22cd72c | 1101 | spin_unlock(&log->l_icloglock); |
014c2544 | 1102 | return needed; |
1da177e4 LT |
1103 | } |
1104 | ||
09a423a3 | 1105 | /* |
1da177e4 LT |
1106 | * We may be holding the log iclog lock upon entering this routine. |
1107 | */ | |
1108 | xfs_lsn_t | |
1c304625 | 1109 | xlog_assign_tail_lsn_locked( |
1c3cb9ec | 1110 | struct xfs_mount *mp) |
1da177e4 | 1111 | { |
ad223e60 | 1112 | struct xlog *log = mp->m_log; |
1c304625 CH |
1113 | struct xfs_log_item *lip; |
1114 | xfs_lsn_t tail_lsn; | |
1115 | ||
57e80956 | 1116 | assert_spin_locked(&mp->m_ail->ail_lock); |
1da177e4 | 1117 | |
09a423a3 CH |
1118 | /* |
1119 | * To make sure we always have a valid LSN for the log tail we keep | |
1120 | * track of the last LSN which was committed in log->l_last_sync_lsn, | |
1c304625 | 1121 | * and use that when the AIL was empty. |
09a423a3 | 1122 | */ |
1c304625 CH |
1123 | lip = xfs_ail_min(mp->m_ail); |
1124 | if (lip) | |
1125 | tail_lsn = lip->li_lsn; | |
1126 | else | |
84f3c683 | 1127 | tail_lsn = atomic64_read(&log->l_last_sync_lsn); |
750b9c90 | 1128 | trace_xfs_log_assign_tail_lsn(log, tail_lsn); |
1c3cb9ec | 1129 | atomic64_set(&log->l_tail_lsn, tail_lsn); |
1da177e4 | 1130 | return tail_lsn; |
1c3cb9ec | 1131 | } |
1da177e4 | 1132 | |
1c304625 CH |
1133 | xfs_lsn_t |
1134 | xlog_assign_tail_lsn( | |
1135 | struct xfs_mount *mp) | |
1136 | { | |
1137 | xfs_lsn_t tail_lsn; | |
1138 | ||
57e80956 | 1139 | spin_lock(&mp->m_ail->ail_lock); |
1c304625 | 1140 | tail_lsn = xlog_assign_tail_lsn_locked(mp); |
57e80956 | 1141 | spin_unlock(&mp->m_ail->ail_lock); |
1c304625 CH |
1142 | |
1143 | return tail_lsn; | |
1144 | } | |
1145 | ||
1da177e4 LT |
1146 | /* |
1147 | * Return the space in the log between the tail and the head. The head | |
1148 | * is passed in the cycle/bytes formal parms. In the special case where | |
1149 | * the reserve head has wrapped passed the tail, this calculation is no | |
1150 | * longer valid. In this case, just return 0 which means there is no space | |
1151 | * in the log. This works for all places where this function is called | |
1152 | * with the reserve head. Of course, if the write head were to ever | |
1153 | * wrap the tail, we should blow up. Rather than catch this case here, | |
1154 | * we depend on other ASSERTions in other parts of the code. XXXmiken | |
1155 | * | |
1156 | * This code also handles the case where the reservation head is behind | |
1157 | * the tail. The details of this case are described below, but the end | |
1158 | * result is that we return the size of the log as the amount of space left. | |
1159 | */ | |
a8272ce0 | 1160 | STATIC int |
a69ed03c | 1161 | xlog_space_left( |
ad223e60 | 1162 | struct xlog *log, |
c8a09ff8 | 1163 | atomic64_t *head) |
1da177e4 | 1164 | { |
a69ed03c DC |
1165 | int free_bytes; |
1166 | int tail_bytes; | |
1167 | int tail_cycle; | |
1168 | int head_cycle; | |
1169 | int head_bytes; | |
1da177e4 | 1170 | |
a69ed03c | 1171 | xlog_crack_grant_head(head, &head_cycle, &head_bytes); |
1c3cb9ec DC |
1172 | xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_bytes); |
1173 | tail_bytes = BBTOB(tail_bytes); | |
a69ed03c DC |
1174 | if (tail_cycle == head_cycle && head_bytes >= tail_bytes) |
1175 | free_bytes = log->l_logsize - (head_bytes - tail_bytes); | |
1176 | else if (tail_cycle + 1 < head_cycle) | |
1da177e4 | 1177 | return 0; |
a69ed03c DC |
1178 | else if (tail_cycle < head_cycle) { |
1179 | ASSERT(tail_cycle == (head_cycle - 1)); | |
1180 | free_bytes = tail_bytes - head_bytes; | |
1da177e4 LT |
1181 | } else { |
1182 | /* | |
1183 | * The reservation head is behind the tail. | |
1184 | * In this case we just want to return the size of the | |
1185 | * log as the amount of space left. | |
1186 | */ | |
f41febd2 | 1187 | xfs_alert(log->l_mp, "xlog_space_left: head behind tail"); |
a0fa2b67 | 1188 | xfs_alert(log->l_mp, |
f41febd2 JP |
1189 | " tail_cycle = %d, tail_bytes = %d", |
1190 | tail_cycle, tail_bytes); | |
1191 | xfs_alert(log->l_mp, | |
1192 | " GH cycle = %d, GH bytes = %d", | |
1193 | head_cycle, head_bytes); | |
1da177e4 LT |
1194 | ASSERT(0); |
1195 | free_bytes = log->l_logsize; | |
1196 | } | |
1197 | return free_bytes; | |
a69ed03c | 1198 | } |
1da177e4 LT |
1199 | |
1200 | ||
0d5a75e9 | 1201 | static void |
79b54d9b CH |
1202 | xlog_ioend_work( |
1203 | struct work_struct *work) | |
1da177e4 | 1204 | { |
79b54d9b CH |
1205 | struct xlog_in_core *iclog = |
1206 | container_of(work, struct xlog_in_core, ic_end_io_work); | |
1207 | struct xlog *log = iclog->ic_log; | |
d15cbf2f | 1208 | bool aborted = false; |
79b54d9b | 1209 | int error; |
1da177e4 | 1210 | |
79b54d9b | 1211 | error = blk_status_to_errno(iclog->ic_bio.bi_status); |
366fc4b8 CH |
1212 | #ifdef DEBUG |
1213 | /* treat writes with injected CRC errors as failed */ | |
1214 | if (iclog->ic_fail_crc) | |
79b54d9b | 1215 | error = -EIO; |
366fc4b8 CH |
1216 | #endif |
1217 | ||
1da177e4 | 1218 | /* |
366fc4b8 | 1219 | * Race to shutdown the filesystem if we see an error. |
1da177e4 | 1220 | */ |
79b54d9b CH |
1221 | if (XFS_TEST_ERROR(error, log->l_mp, XFS_ERRTAG_IODONE_IOERR)) { |
1222 | xfs_alert(log->l_mp, "log I/O error %d", error); | |
1223 | xfs_force_shutdown(log->l_mp, SHUTDOWN_LOG_IO_ERROR); | |
1da177e4 LT |
1224 | /* |
1225 | * This flag will be propagated to the trans-committed | |
1226 | * callback routines to let them know that the log-commit | |
1227 | * didn't succeed. | |
1228 | */ | |
d15cbf2f | 1229 | aborted = true; |
1da177e4 | 1230 | } else if (iclog->ic_state & XLOG_STATE_IOERROR) { |
d15cbf2f | 1231 | aborted = true; |
1da177e4 | 1232 | } |
3db296f3 | 1233 | |
1da177e4 | 1234 | xlog_state_done_syncing(iclog, aborted); |
79b54d9b | 1235 | bio_uninit(&iclog->ic_bio); |
9c23eccc | 1236 | |
3db296f3 | 1237 | /* |
79b54d9b CH |
1238 | * Drop the lock to signal that we are done. Nothing references the |
1239 | * iclog after this, so an unmount waiting on this lock can now tear it | |
1240 | * down safely. As such, it is unsafe to reference the iclog after the | |
1241 | * unlock as we could race with it being freed. | |
3db296f3 | 1242 | */ |
79b54d9b | 1243 | up(&iclog->ic_sema); |
c3f8fc73 | 1244 | } |
1da177e4 | 1245 | |
1da177e4 LT |
1246 | /* |
1247 | * Return size of each in-core log record buffer. | |
1248 | * | |
9da096fd | 1249 | * All machines get 8 x 32kB buffers by default, unless tuned otherwise. |
1da177e4 LT |
1250 | * |
1251 | * If the filesystem blocksize is too large, we may need to choose a | |
1252 | * larger size since the directory code currently logs entire blocks. | |
1253 | */ | |
1da177e4 | 1254 | STATIC void |
9a8d2fdb MT |
1255 | xlog_get_iclog_buffer_size( |
1256 | struct xfs_mount *mp, | |
1257 | struct xlog *log) | |
1da177e4 | 1258 | { |
1cb51258 | 1259 | if (mp->m_logbufs <= 0) |
4f62282a CH |
1260 | mp->m_logbufs = XLOG_MAX_ICLOGS; |
1261 | if (mp->m_logbsize <= 0) | |
1262 | mp->m_logbsize = XLOG_BIG_RECORD_BSIZE; | |
1263 | ||
1264 | log->l_iclog_bufs = mp->m_logbufs; | |
1265 | log->l_iclog_size = mp->m_logbsize; | |
1da177e4 LT |
1266 | |
1267 | /* | |
4f62282a | 1268 | * # headers = size / 32k - one header holds cycles from 32k of data. |
1da177e4 | 1269 | */ |
4f62282a CH |
1270 | log->l_iclog_heads = |
1271 | DIV_ROUND_UP(mp->m_logbsize, XLOG_HEADER_CYCLE_SIZE); | |
1272 | log->l_iclog_hsize = log->l_iclog_heads << BBSHIFT; | |
1273 | } | |
1da177e4 | 1274 | |
f661f1e0 DC |
1275 | void |
1276 | xfs_log_work_queue( | |
1277 | struct xfs_mount *mp) | |
1278 | { | |
696a5620 | 1279 | queue_delayed_work(mp->m_sync_workqueue, &mp->m_log->l_work, |
f661f1e0 DC |
1280 | msecs_to_jiffies(xfs_syncd_centisecs * 10)); |
1281 | } | |
1282 | ||
1283 | /* | |
1284 | * Every sync period we need to unpin all items in the AIL and push them to | |
1285 | * disk. If there is nothing dirty, then we might need to cover the log to | |
1286 | * indicate that the filesystem is idle. | |
1287 | */ | |
0d5a75e9 | 1288 | static void |
f661f1e0 DC |
1289 | xfs_log_worker( |
1290 | struct work_struct *work) | |
1291 | { | |
1292 | struct xlog *log = container_of(to_delayed_work(work), | |
1293 | struct xlog, l_work); | |
1294 | struct xfs_mount *mp = log->l_mp; | |
1295 | ||
1296 | /* dgc: errors ignored - not fatal and nowhere to report them */ | |
61e63ecb DC |
1297 | if (xfs_log_need_covered(mp)) { |
1298 | /* | |
1299 | * Dump a transaction into the log that contains no real change. | |
1300 | * This is needed to stamp the current tail LSN into the log | |
1301 | * during the covering operation. | |
1302 | * | |
1303 | * We cannot use an inode here for this - that will push dirty | |
1304 | * state back up into the VFS and then periodic inode flushing | |
1305 | * will prevent log covering from making progress. Hence we | |
1306 | * synchronously log the superblock instead to ensure the | |
1307 | * superblock is immediately unpinned and can be written back. | |
1308 | */ | |
1309 | xfs_sync_sb(mp, true); | |
1310 | } else | |
f661f1e0 DC |
1311 | xfs_log_force(mp, 0); |
1312 | ||
1313 | /* start pushing all the metadata that is currently dirty */ | |
1314 | xfs_ail_push_all(mp->m_ail); | |
1315 | ||
1316 | /* queue us up again */ | |
1317 | xfs_log_work_queue(mp); | |
1318 | } | |
1319 | ||
1da177e4 LT |
1320 | /* |
1321 | * This routine initializes some of the log structure for a given mount point. | |
1322 | * Its primary purpose is to fill in enough, so recovery can occur. However, | |
1323 | * some other stuff may be filled in too. | |
1324 | */ | |
9a8d2fdb MT |
1325 | STATIC struct xlog * |
1326 | xlog_alloc_log( | |
1327 | struct xfs_mount *mp, | |
1328 | struct xfs_buftarg *log_target, | |
1329 | xfs_daddr_t blk_offset, | |
1330 | int num_bblks) | |
1da177e4 | 1331 | { |
9a8d2fdb | 1332 | struct xlog *log; |
1da177e4 LT |
1333 | xlog_rec_header_t *head; |
1334 | xlog_in_core_t **iclogp; | |
1335 | xlog_in_core_t *iclog, *prev_iclog=NULL; | |
1da177e4 | 1336 | int i; |
2451337d | 1337 | int error = -ENOMEM; |
69ce58f0 | 1338 | uint log2_size = 0; |
1da177e4 | 1339 | |
9a8d2fdb | 1340 | log = kmem_zalloc(sizeof(struct xlog), KM_MAYFAIL); |
a6cb767e | 1341 | if (!log) { |
a0fa2b67 | 1342 | xfs_warn(mp, "Log allocation failed: No memory!"); |
a6cb767e DC |
1343 | goto out; |
1344 | } | |
1da177e4 LT |
1345 | |
1346 | log->l_mp = mp; | |
1347 | log->l_targ = log_target; | |
1348 | log->l_logsize = BBTOB(num_bblks); | |
1349 | log->l_logBBstart = blk_offset; | |
1350 | log->l_logBBsize = num_bblks; | |
1351 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
1352 | log->l_flags |= XLOG_ACTIVE_RECOVERY; | |
f661f1e0 | 1353 | INIT_DELAYED_WORK(&log->l_work, xfs_log_worker); |
1da177e4 LT |
1354 | |
1355 | log->l_prev_block = -1; | |
1da177e4 | 1356 | /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ |
1c3cb9ec DC |
1357 | xlog_assign_atomic_lsn(&log->l_tail_lsn, 1, 0); |
1358 | xlog_assign_atomic_lsn(&log->l_last_sync_lsn, 1, 0); | |
1da177e4 | 1359 | log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ |
c303c5b8 CH |
1360 | |
1361 | xlog_grant_head_init(&log->l_reserve_head); | |
1362 | xlog_grant_head_init(&log->l_write_head); | |
1da177e4 | 1363 | |
2451337d | 1364 | error = -EFSCORRUPTED; |
62118709 | 1365 | if (xfs_sb_version_hassector(&mp->m_sb)) { |
69ce58f0 AE |
1366 | log2_size = mp->m_sb.sb_logsectlog; |
1367 | if (log2_size < BBSHIFT) { | |
a0fa2b67 DC |
1368 | xfs_warn(mp, "Log sector size too small (0x%x < 0x%x)", |
1369 | log2_size, BBSHIFT); | |
a6cb767e DC |
1370 | goto out_free_log; |
1371 | } | |
1372 | ||
69ce58f0 AE |
1373 | log2_size -= BBSHIFT; |
1374 | if (log2_size > mp->m_sectbb_log) { | |
a0fa2b67 DC |
1375 | xfs_warn(mp, "Log sector size too large (0x%x > 0x%x)", |
1376 | log2_size, mp->m_sectbb_log); | |
a6cb767e DC |
1377 | goto out_free_log; |
1378 | } | |
69ce58f0 AE |
1379 | |
1380 | /* for larger sector sizes, must have v2 or external log */ | |
1381 | if (log2_size && log->l_logBBstart > 0 && | |
1382 | !xfs_sb_version_haslogv2(&mp->m_sb)) { | |
a0fa2b67 DC |
1383 | xfs_warn(mp, |
1384 | "log sector size (0x%x) invalid for configuration.", | |
1385 | log2_size); | |
a6cb767e DC |
1386 | goto out_free_log; |
1387 | } | |
1da177e4 | 1388 | } |
69ce58f0 | 1389 | log->l_sectBBsize = 1 << log2_size; |
1da177e4 LT |
1390 | |
1391 | xlog_get_iclog_buffer_size(mp, log); | |
1392 | ||
007c61c6 | 1393 | spin_lock_init(&log->l_icloglock); |
eb40a875 | 1394 | init_waitqueue_head(&log->l_flush_wait); |
1da177e4 | 1395 | |
1da177e4 LT |
1396 | iclogp = &log->l_iclog; |
1397 | /* | |
1398 | * The amount of memory to allocate for the iclog structure is | |
1399 | * rather funky due to the way the structure is defined. It is | |
1400 | * done this way so that we can use different sizes for machines | |
1401 | * with different amounts of memory. See the definition of | |
1402 | * xlog_in_core_t in xfs_log_priv.h for details. | |
1403 | */ | |
1da177e4 | 1404 | ASSERT(log->l_iclog_size >= 4096); |
79b54d9b | 1405 | for (i = 0; i < log->l_iclog_bufs; i++) { |
f8f9ee47 | 1406 | int align_mask = xfs_buftarg_dma_alignment(mp->m_logdev_targp); |
89b171ac CH |
1407 | size_t bvec_size = howmany(log->l_iclog_size, PAGE_SIZE) * |
1408 | sizeof(struct bio_vec); | |
79b54d9b CH |
1409 | |
1410 | iclog = kmem_zalloc(sizeof(*iclog) + bvec_size, KM_MAYFAIL); | |
1411 | if (!iclog) | |
644c3567 DC |
1412 | goto out_free_iclog; |
1413 | ||
79b54d9b | 1414 | *iclogp = iclog; |
1da177e4 LT |
1415 | iclog->ic_prev = prev_iclog; |
1416 | prev_iclog = iclog; | |
1fa40b01 | 1417 | |
f8f9ee47 DC |
1418 | iclog->ic_data = kmem_alloc_io(log->l_iclog_size, align_mask, |
1419 | KM_MAYFAIL); | |
79b54d9b | 1420 | if (!iclog->ic_data) |
644c3567 | 1421 | goto out_free_iclog; |
4679b2d3 | 1422 | #ifdef DEBUG |
5809d5e0 | 1423 | log->l_iclog_bak[i] = &iclog->ic_header; |
4679b2d3 | 1424 | #endif |
1da177e4 LT |
1425 | head = &iclog->ic_header; |
1426 | memset(head, 0, sizeof(xlog_rec_header_t)); | |
b53e675d CH |
1427 | head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM); |
1428 | head->h_version = cpu_to_be32( | |
62118709 | 1429 | xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? 2 : 1); |
b53e675d | 1430 | head->h_size = cpu_to_be32(log->l_iclog_size); |
1da177e4 | 1431 | /* new fields */ |
b53e675d | 1432 | head->h_fmt = cpu_to_be32(XLOG_FMT); |
1da177e4 LT |
1433 | memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); |
1434 | ||
79b54d9b | 1435 | iclog->ic_size = log->l_iclog_size - log->l_iclog_hsize; |
1da177e4 LT |
1436 | iclog->ic_state = XLOG_STATE_ACTIVE; |
1437 | iclog->ic_log = log; | |
114d23aa DC |
1438 | atomic_set(&iclog->ic_refcnt, 0); |
1439 | spin_lock_init(&iclog->ic_callback_lock); | |
89ae379d | 1440 | INIT_LIST_HEAD(&iclog->ic_callbacks); |
b28708d6 | 1441 | iclog->ic_datap = (char *)iclog->ic_data + log->l_iclog_hsize; |
1da177e4 | 1442 | |
eb40a875 DC |
1443 | init_waitqueue_head(&iclog->ic_force_wait); |
1444 | init_waitqueue_head(&iclog->ic_write_wait); | |
79b54d9b CH |
1445 | INIT_WORK(&iclog->ic_end_io_work, xlog_ioend_work); |
1446 | sema_init(&iclog->ic_sema, 1); | |
1da177e4 LT |
1447 | |
1448 | iclogp = &iclog->ic_next; | |
1449 | } | |
1450 | *iclogp = log->l_iclog; /* complete ring */ | |
1451 | log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ | |
1452 | ||
1058d0f5 CH |
1453 | log->l_ioend_workqueue = alloc_workqueue("xfs-log/%s", |
1454 | WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_HIGHPRI, 0, | |
1455 | mp->m_fsname); | |
1456 | if (!log->l_ioend_workqueue) | |
1457 | goto out_free_iclog; | |
1458 | ||
71e330b5 DC |
1459 | error = xlog_cil_init(log); |
1460 | if (error) | |
1058d0f5 | 1461 | goto out_destroy_workqueue; |
1da177e4 | 1462 | return log; |
644c3567 | 1463 | |
1058d0f5 CH |
1464 | out_destroy_workqueue: |
1465 | destroy_workqueue(log->l_ioend_workqueue); | |
644c3567 DC |
1466 | out_free_iclog: |
1467 | for (iclog = log->l_iclog; iclog; iclog = prev_iclog) { | |
1468 | prev_iclog = iclog->ic_next; | |
79b54d9b | 1469 | kmem_free(iclog->ic_data); |
644c3567 DC |
1470 | kmem_free(iclog); |
1471 | } | |
644c3567 DC |
1472 | out_free_log: |
1473 | kmem_free(log); | |
a6cb767e | 1474 | out: |
2451337d | 1475 | return ERR_PTR(error); |
1da177e4 LT |
1476 | } /* xlog_alloc_log */ |
1477 | ||
1478 | ||
1479 | /* | |
1480 | * Write out the commit record of a transaction associated with the given | |
1481 | * ticket. Return the lsn of the commit record. | |
1482 | */ | |
1483 | STATIC int | |
55b66332 | 1484 | xlog_commit_record( |
ad223e60 | 1485 | struct xlog *log, |
55b66332 DC |
1486 | struct xlog_ticket *ticket, |
1487 | struct xlog_in_core **iclog, | |
1488 | xfs_lsn_t *commitlsnp) | |
1da177e4 | 1489 | { |
55b66332 DC |
1490 | struct xfs_mount *mp = log->l_mp; |
1491 | int error; | |
1492 | struct xfs_log_iovec reg = { | |
1493 | .i_addr = NULL, | |
1494 | .i_len = 0, | |
1495 | .i_type = XLOG_REG_TYPE_COMMIT, | |
1496 | }; | |
1497 | struct xfs_log_vec vec = { | |
1498 | .lv_niovecs = 1, | |
1499 | .lv_iovecp = ®, | |
1500 | }; | |
1da177e4 LT |
1501 | |
1502 | ASSERT_ALWAYS(iclog); | |
55b66332 DC |
1503 | error = xlog_write(log, &vec, ticket, commitlsnp, iclog, |
1504 | XLOG_COMMIT_TRANS); | |
1505 | if (error) | |
7d04a335 | 1506 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
014c2544 | 1507 | return error; |
55b66332 | 1508 | } |
1da177e4 LT |
1509 | |
1510 | /* | |
1511 | * Push on the buffer cache code if we ever use more than 75% of the on-disk | |
1512 | * log space. This code pushes on the lsn which would supposedly free up | |
1513 | * the 25% which we want to leave free. We may need to adopt a policy which | |
1514 | * pushes on an lsn which is further along in the log once we reach the high | |
1515 | * water mark. In this manner, we would be creating a low water mark. | |
1516 | */ | |
a8272ce0 | 1517 | STATIC void |
2ced19cb | 1518 | xlog_grant_push_ail( |
ad223e60 | 1519 | struct xlog *log, |
2ced19cb | 1520 | int need_bytes) |
1da177e4 | 1521 | { |
2ced19cb | 1522 | xfs_lsn_t threshold_lsn = 0; |
84f3c683 | 1523 | xfs_lsn_t last_sync_lsn; |
2ced19cb DC |
1524 | int free_blocks; |
1525 | int free_bytes; | |
1526 | int threshold_block; | |
1527 | int threshold_cycle; | |
1528 | int free_threshold; | |
1529 | ||
1530 | ASSERT(BTOBB(need_bytes) < log->l_logBBsize); | |
1531 | ||
28496968 | 1532 | free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); |
2ced19cb DC |
1533 | free_blocks = BTOBBT(free_bytes); |
1534 | ||
1535 | /* | |
1536 | * Set the threshold for the minimum number of free blocks in the | |
1537 | * log to the maximum of what the caller needs, one quarter of the | |
1538 | * log, and 256 blocks. | |
1539 | */ | |
1540 | free_threshold = BTOBB(need_bytes); | |
9bb54cb5 DC |
1541 | free_threshold = max(free_threshold, (log->l_logBBsize >> 2)); |
1542 | free_threshold = max(free_threshold, 256); | |
2ced19cb DC |
1543 | if (free_blocks >= free_threshold) |
1544 | return; | |
1545 | ||
1c3cb9ec DC |
1546 | xlog_crack_atomic_lsn(&log->l_tail_lsn, &threshold_cycle, |
1547 | &threshold_block); | |
1548 | threshold_block += free_threshold; | |
1da177e4 | 1549 | if (threshold_block >= log->l_logBBsize) { |
2ced19cb DC |
1550 | threshold_block -= log->l_logBBsize; |
1551 | threshold_cycle += 1; | |
1da177e4 | 1552 | } |
2ced19cb DC |
1553 | threshold_lsn = xlog_assign_lsn(threshold_cycle, |
1554 | threshold_block); | |
1555 | /* | |
1556 | * Don't pass in an lsn greater than the lsn of the last | |
84f3c683 DC |
1557 | * log record known to be on disk. Use a snapshot of the last sync lsn |
1558 | * so that it doesn't change between the compare and the set. | |
1da177e4 | 1559 | */ |
84f3c683 DC |
1560 | last_sync_lsn = atomic64_read(&log->l_last_sync_lsn); |
1561 | if (XFS_LSN_CMP(threshold_lsn, last_sync_lsn) > 0) | |
1562 | threshold_lsn = last_sync_lsn; | |
2ced19cb DC |
1563 | |
1564 | /* | |
1565 | * Get the transaction layer to kick the dirty buffers out to | |
1566 | * disk asynchronously. No point in trying to do this if | |
1567 | * the filesystem is shutting down. | |
1568 | */ | |
1569 | if (!XLOG_FORCED_SHUTDOWN(log)) | |
fd074841 | 1570 | xfs_ail_push(log->l_ailp, threshold_lsn); |
2ced19cb | 1571 | } |
1da177e4 | 1572 | |
0e446be4 CH |
1573 | /* |
1574 | * Stamp cycle number in every block | |
1575 | */ | |
1576 | STATIC void | |
1577 | xlog_pack_data( | |
1578 | struct xlog *log, | |
1579 | struct xlog_in_core *iclog, | |
1580 | int roundoff) | |
1581 | { | |
1582 | int i, j, k; | |
1583 | int size = iclog->ic_offset + roundoff; | |
1584 | __be32 cycle_lsn; | |
b2a922cd | 1585 | char *dp; |
0e446be4 CH |
1586 | |
1587 | cycle_lsn = CYCLE_LSN_DISK(iclog->ic_header.h_lsn); | |
1588 | ||
1589 | dp = iclog->ic_datap; | |
1590 | for (i = 0; i < BTOBB(size); i++) { | |
1591 | if (i >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) | |
1592 | break; | |
1593 | iclog->ic_header.h_cycle_data[i] = *(__be32 *)dp; | |
1594 | *(__be32 *)dp = cycle_lsn; | |
1595 | dp += BBSIZE; | |
1596 | } | |
1597 | ||
1598 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) { | |
1599 | xlog_in_core_2_t *xhdr = iclog->ic_data; | |
1600 | ||
1601 | for ( ; i < BTOBB(size); i++) { | |
1602 | j = i / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
1603 | k = i % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
1604 | xhdr[j].hic_xheader.xh_cycle_data[k] = *(__be32 *)dp; | |
1605 | *(__be32 *)dp = cycle_lsn; | |
1606 | dp += BBSIZE; | |
1607 | } | |
1608 | ||
1609 | for (i = 1; i < log->l_iclog_heads; i++) | |
1610 | xhdr[i].hic_xheader.xh_cycle = cycle_lsn; | |
1611 | } | |
1612 | } | |
1613 | ||
1614 | /* | |
1615 | * Calculate the checksum for a log buffer. | |
1616 | * | |
1617 | * This is a little more complicated than it should be because the various | |
1618 | * headers and the actual data are non-contiguous. | |
1619 | */ | |
f9668a09 | 1620 | __le32 |
0e446be4 CH |
1621 | xlog_cksum( |
1622 | struct xlog *log, | |
1623 | struct xlog_rec_header *rhead, | |
1624 | char *dp, | |
1625 | int size) | |
1626 | { | |
c8ce540d | 1627 | uint32_t crc; |
0e446be4 CH |
1628 | |
1629 | /* first generate the crc for the record header ... */ | |
cae028df | 1630 | crc = xfs_start_cksum_update((char *)rhead, |
0e446be4 CH |
1631 | sizeof(struct xlog_rec_header), |
1632 | offsetof(struct xlog_rec_header, h_crc)); | |
1633 | ||
1634 | /* ... then for additional cycle data for v2 logs ... */ | |
1635 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) { | |
1636 | union xlog_in_core2 *xhdr = (union xlog_in_core2 *)rhead; | |
1637 | int i; | |
a3f20014 | 1638 | int xheads; |
0e446be4 | 1639 | |
a3f20014 BF |
1640 | xheads = size / XLOG_HEADER_CYCLE_SIZE; |
1641 | if (size % XLOG_HEADER_CYCLE_SIZE) | |
1642 | xheads++; | |
0e446be4 | 1643 | |
a3f20014 | 1644 | for (i = 1; i < xheads; i++) { |
0e446be4 CH |
1645 | crc = crc32c(crc, &xhdr[i].hic_xheader, |
1646 | sizeof(struct xlog_rec_ext_header)); | |
1647 | } | |
1648 | } | |
1649 | ||
1650 | /* ... and finally for the payload */ | |
1651 | crc = crc32c(crc, dp, size); | |
1652 | ||
1653 | return xfs_end_cksum(crc); | |
1654 | } | |
1655 | ||
79b54d9b CH |
1656 | static void |
1657 | xlog_bio_end_io( | |
1658 | struct bio *bio) | |
1659 | { | |
1660 | struct xlog_in_core *iclog = bio->bi_private; | |
1661 | ||
1058d0f5 | 1662 | queue_work(iclog->ic_log->l_ioend_workqueue, |
79b54d9b CH |
1663 | &iclog->ic_end_io_work); |
1664 | } | |
1665 | ||
1666 | static void | |
1667 | xlog_map_iclog_data( | |
1668 | struct bio *bio, | |
1669 | void *data, | |
1670 | size_t count) | |
1671 | { | |
1672 | do { | |
1673 | struct page *page = kmem_to_page(data); | |
1674 | unsigned int off = offset_in_page(data); | |
1675 | size_t len = min_t(size_t, count, PAGE_SIZE - off); | |
1676 | ||
1677 | WARN_ON_ONCE(bio_add_page(bio, page, len, off) != len); | |
1678 | ||
1679 | data += len; | |
1680 | count -= len; | |
1681 | } while (count); | |
1682 | } | |
1683 | ||
94860a30 CH |
1684 | STATIC void |
1685 | xlog_write_iclog( | |
1686 | struct xlog *log, | |
1687 | struct xlog_in_core *iclog, | |
94860a30 | 1688 | uint64_t bno, |
79b54d9b | 1689 | unsigned int count, |
94860a30 | 1690 | bool need_flush) |
873ff550 | 1691 | { |
94860a30 | 1692 | ASSERT(bno < log->l_logBBsize); |
94860a30 CH |
1693 | |
1694 | /* | |
1695 | * We lock the iclogbufs here so that we can serialise against I/O | |
1696 | * completion during unmount. We might be processing a shutdown | |
1697 | * triggered during unmount, and that can occur asynchronously to the | |
1698 | * unmount thread, and hence we need to ensure that completes before | |
1699 | * tearing down the iclogbufs. Hence we need to hold the buffer lock | |
1700 | * across the log IO to archieve that. | |
1701 | */ | |
79b54d9b | 1702 | down(&iclog->ic_sema); |
94860a30 | 1703 | if (unlikely(iclog->ic_state & XLOG_STATE_IOERROR)) { |
873ff550 CH |
1704 | /* |
1705 | * It would seem logical to return EIO here, but we rely on | |
1706 | * the log state machine to propagate I/O errors instead of | |
79b54d9b CH |
1707 | * doing it here. We kick of the state machine and unlock |
1708 | * the buffer manually, the code needs to be kept in sync | |
1709 | * with the I/O completion path. | |
873ff550 | 1710 | */ |
79b54d9b CH |
1711 | xlog_state_done_syncing(iclog, XFS_LI_ABORTED); |
1712 | up(&iclog->ic_sema); | |
94860a30 | 1713 | return; |
873ff550 CH |
1714 | } |
1715 | ||
79b54d9b CH |
1716 | iclog->ic_io_size = count; |
1717 | ||
1718 | bio_init(&iclog->ic_bio, iclog->ic_bvec, howmany(count, PAGE_SIZE)); | |
1719 | bio_set_dev(&iclog->ic_bio, log->l_targ->bt_bdev); | |
1720 | iclog->ic_bio.bi_iter.bi_sector = log->l_logBBstart + bno; | |
1721 | iclog->ic_bio.bi_end_io = xlog_bio_end_io; | |
1722 | iclog->ic_bio.bi_private = iclog; | |
1723 | iclog->ic_bio.bi_opf = REQ_OP_WRITE | REQ_META | REQ_SYNC | REQ_FUA; | |
1724 | if (need_flush) | |
1725 | iclog->ic_bio.bi_opf |= REQ_PREFLUSH; | |
1726 | ||
1727 | xlog_map_iclog_data(&iclog->ic_bio, iclog->ic_data, iclog->ic_io_size); | |
1728 | if (is_vmalloc_addr(iclog->ic_data)) | |
1729 | flush_kernel_vmap_range(iclog->ic_data, iclog->ic_io_size); | |
1730 | ||
1731 | /* | |
1732 | * If this log buffer would straddle the end of the log we will have | |
1733 | * to split it up into two bios, so that we can continue at the start. | |
1734 | */ | |
1735 | if (bno + BTOBB(count) > log->l_logBBsize) { | |
1736 | struct bio *split; | |
1737 | ||
1738 | split = bio_split(&iclog->ic_bio, log->l_logBBsize - bno, | |
1739 | GFP_NOIO, &fs_bio_set); | |
1740 | bio_chain(split, &iclog->ic_bio); | |
1741 | submit_bio(split); | |
1742 | ||
1743 | /* restart at logical offset zero for the remainder */ | |
1744 | iclog->ic_bio.bi_iter.bi_sector = log->l_logBBstart; | |
1745 | } | |
1746 | ||
1747 | submit_bio(&iclog->ic_bio); | |
873ff550 | 1748 | } |
1da177e4 | 1749 | |
56933848 CH |
1750 | /* |
1751 | * We need to bump cycle number for the part of the iclog that is | |
1752 | * written to the start of the log. Watch out for the header magic | |
1753 | * number case, though. | |
1754 | */ | |
79b54d9b | 1755 | static void |
56933848 CH |
1756 | xlog_split_iclog( |
1757 | struct xlog *log, | |
1758 | void *data, | |
1759 | uint64_t bno, | |
1760 | unsigned int count) | |
1761 | { | |
1762 | unsigned int split_offset = BBTOB(log->l_logBBsize - bno); | |
1763 | unsigned int i; | |
1764 | ||
1765 | for (i = split_offset; i < count; i += BBSIZE) { | |
1766 | uint32_t cycle = get_unaligned_be32(data + i); | |
1767 | ||
1768 | if (++cycle == XLOG_HEADER_MAGIC_NUM) | |
1769 | cycle++; | |
1770 | put_unaligned_be32(cycle, data + i); | |
1771 | } | |
56933848 CH |
1772 | } |
1773 | ||
db0a6faf CH |
1774 | static int |
1775 | xlog_calc_iclog_size( | |
1776 | struct xlog *log, | |
1777 | struct xlog_in_core *iclog, | |
1778 | uint32_t *roundoff) | |
1779 | { | |
1780 | uint32_t count_init, count; | |
1781 | bool use_lsunit; | |
1782 | ||
1783 | use_lsunit = xfs_sb_version_haslogv2(&log->l_mp->m_sb) && | |
1784 | log->l_mp->m_sb.sb_logsunit > 1; | |
1785 | ||
1786 | /* Add for LR header */ | |
1787 | count_init = log->l_iclog_hsize + iclog->ic_offset; | |
1788 | ||
1789 | /* Round out the log write size */ | |
1790 | if (use_lsunit) { | |
1791 | /* we have a v2 stripe unit to use */ | |
1792 | count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); | |
1793 | } else { | |
1794 | count = BBTOB(BTOBB(count_init)); | |
1795 | } | |
1796 | ||
1797 | ASSERT(count >= count_init); | |
1798 | *roundoff = count - count_init; | |
1799 | ||
1800 | if (use_lsunit) | |
1801 | ASSERT(*roundoff < log->l_mp->m_sb.sb_logsunit); | |
1802 | else | |
1803 | ASSERT(*roundoff < BBTOB(1)); | |
1804 | return count; | |
1805 | } | |
1806 | ||
1da177e4 LT |
1807 | /* |
1808 | * Flush out the in-core log (iclog) to the on-disk log in an asynchronous | |
1809 | * fashion. Previously, we should have moved the current iclog | |
1810 | * ptr in the log to point to the next available iclog. This allows further | |
1811 | * write to continue while this code syncs out an iclog ready to go. | |
1812 | * Before an in-core log can be written out, the data section must be scanned | |
1813 | * to save away the 1st word of each BBSIZE block into the header. We replace | |
1814 | * it with the current cycle count. Each BBSIZE block is tagged with the | |
1815 | * cycle count because there in an implicit assumption that drives will | |
1816 | * guarantee that entire 512 byte blocks get written at once. In other words, | |
1817 | * we can't have part of a 512 byte block written and part not written. By | |
1818 | * tagging each block, we will know which blocks are valid when recovering | |
1819 | * after an unclean shutdown. | |
1820 | * | |
1821 | * This routine is single threaded on the iclog. No other thread can be in | |
1822 | * this routine with the same iclog. Changing contents of iclog can there- | |
1823 | * fore be done without grabbing the state machine lock. Updating the global | |
1824 | * log will require grabbing the lock though. | |
1825 | * | |
1826 | * The entire log manager uses a logical block numbering scheme. Only | |
94860a30 CH |
1827 | * xlog_write_iclog knows about the fact that the log may not start with |
1828 | * block zero on a given device. | |
1da177e4 | 1829 | */ |
94860a30 | 1830 | STATIC void |
9a8d2fdb MT |
1831 | xlog_sync( |
1832 | struct xlog *log, | |
1833 | struct xlog_in_core *iclog) | |
1da177e4 | 1834 | { |
db0a6faf CH |
1835 | unsigned int count; /* byte count of bwrite */ |
1836 | unsigned int roundoff; /* roundoff to BB or stripe */ | |
1837 | uint64_t bno; | |
db0a6faf | 1838 | unsigned int size; |
79b54d9b | 1839 | bool need_flush = true, split = false; |
1da177e4 | 1840 | |
155cc6b7 | 1841 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 | 1842 | |
db0a6faf | 1843 | count = xlog_calc_iclog_size(log, iclog, &roundoff); |
1da177e4 LT |
1844 | |
1845 | /* move grant heads by roundoff in sync */ | |
28496968 CH |
1846 | xlog_grant_add_space(log, &log->l_reserve_head.grant, roundoff); |
1847 | xlog_grant_add_space(log, &log->l_write_head.grant, roundoff); | |
1da177e4 LT |
1848 | |
1849 | /* put cycle number in every block */ | |
1850 | xlog_pack_data(log, iclog, roundoff); | |
1851 | ||
1852 | /* real byte length */ | |
0e446be4 | 1853 | size = iclog->ic_offset; |
db0a6faf | 1854 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) |
0e446be4 CH |
1855 | size += roundoff; |
1856 | iclog->ic_header.h_len = cpu_to_be32(size); | |
1da177e4 | 1857 | |
9b0489c1 | 1858 | XFS_STATS_INC(log->l_mp, xs_log_writes); |
ff6d6af2 | 1859 | XFS_STATS_ADD(log->l_mp, xs_log_blocks, BTOBB(count)); |
1da177e4 | 1860 | |
94860a30 CH |
1861 | bno = BLOCK_LSN(be64_to_cpu(iclog->ic_header.h_lsn)); |
1862 | ||
1da177e4 | 1863 | /* Do we need to split this write into 2 parts? */ |
79b54d9b CH |
1864 | if (bno + BTOBB(count) > log->l_logBBsize) { |
1865 | xlog_split_iclog(log, &iclog->ic_header, bno, count); | |
1866 | split = true; | |
1867 | } | |
0e446be4 CH |
1868 | |
1869 | /* calculcate the checksum */ | |
1870 | iclog->ic_header.h_crc = xlog_cksum(log, &iclog->ic_header, | |
1871 | iclog->ic_datap, size); | |
609adfc2 BF |
1872 | /* |
1873 | * Intentionally corrupt the log record CRC based on the error injection | |
1874 | * frequency, if defined. This facilitates testing log recovery in the | |
1875 | * event of torn writes. Hence, set the IOABORT state to abort the log | |
1876 | * write on I/O completion and shutdown the fs. The subsequent mount | |
1877 | * detects the bad CRC and attempts to recover. | |
1878 | */ | |
366fc4b8 | 1879 | #ifdef DEBUG |
3e88a007 | 1880 | if (XFS_TEST_ERROR(false, log->l_mp, XFS_ERRTAG_LOG_BAD_CRC)) { |
e2a64192 | 1881 | iclog->ic_header.h_crc &= cpu_to_le32(0xAAAAAAAA); |
366fc4b8 | 1882 | iclog->ic_fail_crc = true; |
609adfc2 BF |
1883 | xfs_warn(log->l_mp, |
1884 | "Intentionally corrupted log record at LSN 0x%llx. Shutdown imminent.", | |
1885 | be64_to_cpu(iclog->ic_header.h_lsn)); | |
1886 | } | |
366fc4b8 | 1887 | #endif |
0e446be4 | 1888 | |
2291dab2 DC |
1889 | /* |
1890 | * Flush the data device before flushing the log to make sure all meta | |
1891 | * data written back from the AIL actually made it to disk before | |
1892 | * stamping the new log tail LSN into the log buffer. For an external | |
1893 | * log we need to issue the flush explicitly, and unfortunately | |
1894 | * synchronously here; for an internal log we can simply use the block | |
1895 | * layer state machine for preflushes. | |
1896 | */ | |
2d15d2c0 | 1897 | if (log->l_targ != log->l_mp->m_ddev_targp || split) { |
2291dab2 | 1898 | xfs_blkdev_issue_flush(log->l_mp->m_ddev_targp); |
94860a30 CH |
1899 | need_flush = false; |
1900 | } | |
1da177e4 | 1901 | |
abca1f33 | 1902 | xlog_verify_iclog(log, iclog, count); |
79b54d9b | 1903 | xlog_write_iclog(log, iclog, bno, count, need_flush); |
94860a30 | 1904 | } |
1da177e4 | 1905 | |
1da177e4 | 1906 | /* |
c41564b5 | 1907 | * Deallocate a log structure |
1da177e4 | 1908 | */ |
a8272ce0 | 1909 | STATIC void |
9a8d2fdb MT |
1910 | xlog_dealloc_log( |
1911 | struct xlog *log) | |
1da177e4 LT |
1912 | { |
1913 | xlog_in_core_t *iclog, *next_iclog; | |
1da177e4 LT |
1914 | int i; |
1915 | ||
71e330b5 DC |
1916 | xlog_cil_destroy(log); |
1917 | ||
44396476 | 1918 | /* |
9c23eccc DC |
1919 | * Cycle all the iclogbuf locks to make sure all log IO completion |
1920 | * is done before we tear down these buffers. | |
1921 | */ | |
1922 | iclog = log->l_iclog; | |
1923 | for (i = 0; i < log->l_iclog_bufs; i++) { | |
79b54d9b CH |
1924 | down(&iclog->ic_sema); |
1925 | up(&iclog->ic_sema); | |
9c23eccc DC |
1926 | iclog = iclog->ic_next; |
1927 | } | |
1928 | ||
1da177e4 | 1929 | iclog = log->l_iclog; |
9c23eccc | 1930 | for (i = 0; i < log->l_iclog_bufs; i++) { |
1da177e4 | 1931 | next_iclog = iclog->ic_next; |
79b54d9b | 1932 | kmem_free(iclog->ic_data); |
f0e2d93c | 1933 | kmem_free(iclog); |
1da177e4 LT |
1934 | iclog = next_iclog; |
1935 | } | |
1da177e4 | 1936 | |
1da177e4 | 1937 | log->l_mp->m_log = NULL; |
1058d0f5 | 1938 | destroy_workqueue(log->l_ioend_workqueue); |
f0e2d93c | 1939 | kmem_free(log); |
c41564b5 | 1940 | } /* xlog_dealloc_log */ |
1da177e4 LT |
1941 | |
1942 | /* | |
1943 | * Update counters atomically now that memcpy is done. | |
1944 | */ | |
1945 | /* ARGSUSED */ | |
1946 | static inline void | |
9a8d2fdb MT |
1947 | xlog_state_finish_copy( |
1948 | struct xlog *log, | |
1949 | struct xlog_in_core *iclog, | |
1950 | int record_cnt, | |
1951 | int copy_bytes) | |
1da177e4 | 1952 | { |
b22cd72c | 1953 | spin_lock(&log->l_icloglock); |
1da177e4 | 1954 | |
413d57c9 | 1955 | be32_add_cpu(&iclog->ic_header.h_num_logops, record_cnt); |
1da177e4 LT |
1956 | iclog->ic_offset += copy_bytes; |
1957 | ||
b22cd72c | 1958 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
1959 | } /* xlog_state_finish_copy */ |
1960 | ||
1961 | ||
1962 | ||
1963 | ||
7e9c6396 TS |
1964 | /* |
1965 | * print out info relating to regions written which consume | |
1966 | * the reservation | |
1967 | */ | |
71e330b5 DC |
1968 | void |
1969 | xlog_print_tic_res( | |
1970 | struct xfs_mount *mp, | |
1971 | struct xlog_ticket *ticket) | |
7e9c6396 TS |
1972 | { |
1973 | uint i; | |
1974 | uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); | |
1975 | ||
1976 | /* match with XLOG_REG_TYPE_* in xfs_log.h */ | |
5110cd82 | 1977 | #define REG_TYPE_STR(type, str) [XLOG_REG_TYPE_##type] = str |
d31d7185 | 1978 | static char *res_type_str[] = { |
5110cd82 DW |
1979 | REG_TYPE_STR(BFORMAT, "bformat"), |
1980 | REG_TYPE_STR(BCHUNK, "bchunk"), | |
1981 | REG_TYPE_STR(EFI_FORMAT, "efi_format"), | |
1982 | REG_TYPE_STR(EFD_FORMAT, "efd_format"), | |
1983 | REG_TYPE_STR(IFORMAT, "iformat"), | |
1984 | REG_TYPE_STR(ICORE, "icore"), | |
1985 | REG_TYPE_STR(IEXT, "iext"), | |
1986 | REG_TYPE_STR(IBROOT, "ibroot"), | |
1987 | REG_TYPE_STR(ILOCAL, "ilocal"), | |
1988 | REG_TYPE_STR(IATTR_EXT, "iattr_ext"), | |
1989 | REG_TYPE_STR(IATTR_BROOT, "iattr_broot"), | |
1990 | REG_TYPE_STR(IATTR_LOCAL, "iattr_local"), | |
1991 | REG_TYPE_STR(QFORMAT, "qformat"), | |
1992 | REG_TYPE_STR(DQUOT, "dquot"), | |
1993 | REG_TYPE_STR(QUOTAOFF, "quotaoff"), | |
1994 | REG_TYPE_STR(LRHEADER, "LR header"), | |
1995 | REG_TYPE_STR(UNMOUNT, "unmount"), | |
1996 | REG_TYPE_STR(COMMIT, "commit"), | |
1997 | REG_TYPE_STR(TRANSHDR, "trans header"), | |
d31d7185 DW |
1998 | REG_TYPE_STR(ICREATE, "inode create"), |
1999 | REG_TYPE_STR(RUI_FORMAT, "rui_format"), | |
2000 | REG_TYPE_STR(RUD_FORMAT, "rud_format"), | |
2001 | REG_TYPE_STR(CUI_FORMAT, "cui_format"), | |
2002 | REG_TYPE_STR(CUD_FORMAT, "cud_format"), | |
2003 | REG_TYPE_STR(BUI_FORMAT, "bui_format"), | |
2004 | REG_TYPE_STR(BUD_FORMAT, "bud_format"), | |
7e9c6396 | 2005 | }; |
d31d7185 | 2006 | BUILD_BUG_ON(ARRAY_SIZE(res_type_str) != XLOG_REG_TYPE_MAX + 1); |
5110cd82 | 2007 | #undef REG_TYPE_STR |
7e9c6396 | 2008 | |
7d2d5653 | 2009 | xfs_warn(mp, "ticket reservation summary:"); |
f41febd2 JP |
2010 | xfs_warn(mp, " unit res = %d bytes", |
2011 | ticket->t_unit_res); | |
2012 | xfs_warn(mp, " current res = %d bytes", | |
2013 | ticket->t_curr_res); | |
2014 | xfs_warn(mp, " total reg = %u bytes (o/flow = %u bytes)", | |
2015 | ticket->t_res_arr_sum, ticket->t_res_o_flow); | |
2016 | xfs_warn(mp, " ophdrs = %u (ophdr space = %u bytes)", | |
2017 | ticket->t_res_num_ophdrs, ophdr_spc); | |
2018 | xfs_warn(mp, " ophdr + reg = %u bytes", | |
2019 | ticket->t_res_arr_sum + ticket->t_res_o_flow + ophdr_spc); | |
2020 | xfs_warn(mp, " num regions = %u", | |
2021 | ticket->t_res_num); | |
7e9c6396 TS |
2022 | |
2023 | for (i = 0; i < ticket->t_res_num; i++) { | |
a0fa2b67 | 2024 | uint r_type = ticket->t_res_arr[i].r_type; |
08e96e1a | 2025 | xfs_warn(mp, "region[%u]: %s - %u bytes", i, |
7e9c6396 | 2026 | ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ? |
5110cd82 | 2027 | "bad-rtype" : res_type_str[r_type]), |
7e9c6396 TS |
2028 | ticket->t_res_arr[i].r_len); |
2029 | } | |
2030 | } | |
7e9c6396 | 2031 | |
d4ca1d55 BF |
2032 | /* |
2033 | * Print a summary of the transaction. | |
2034 | */ | |
2035 | void | |
2036 | xlog_print_trans( | |
e6631f85 | 2037 | struct xfs_trans *tp) |
d4ca1d55 | 2038 | { |
e6631f85 DC |
2039 | struct xfs_mount *mp = tp->t_mountp; |
2040 | struct xfs_log_item *lip; | |
d4ca1d55 BF |
2041 | |
2042 | /* dump core transaction and ticket info */ | |
2043 | xfs_warn(mp, "transaction summary:"); | |
2c8f6265 BF |
2044 | xfs_warn(mp, " log res = %d", tp->t_log_res); |
2045 | xfs_warn(mp, " log count = %d", tp->t_log_count); | |
2046 | xfs_warn(mp, " flags = 0x%x", tp->t_flags); | |
d4ca1d55 BF |
2047 | |
2048 | xlog_print_tic_res(mp, tp->t_ticket); | |
2049 | ||
2050 | /* dump each log item */ | |
e6631f85 | 2051 | list_for_each_entry(lip, &tp->t_items, li_trans) { |
d4ca1d55 BF |
2052 | struct xfs_log_vec *lv = lip->li_lv; |
2053 | struct xfs_log_iovec *vec; | |
2054 | int i; | |
2055 | ||
2056 | xfs_warn(mp, "log item: "); | |
2057 | xfs_warn(mp, " type = 0x%x", lip->li_type); | |
22525c17 | 2058 | xfs_warn(mp, " flags = 0x%lx", lip->li_flags); |
d4ca1d55 BF |
2059 | if (!lv) |
2060 | continue; | |
2061 | xfs_warn(mp, " niovecs = %d", lv->lv_niovecs); | |
2062 | xfs_warn(mp, " size = %d", lv->lv_size); | |
2063 | xfs_warn(mp, " bytes = %d", lv->lv_bytes); | |
2064 | xfs_warn(mp, " buf len = %d", lv->lv_buf_len); | |
2065 | ||
2066 | /* dump each iovec for the log item */ | |
2067 | vec = lv->lv_iovecp; | |
2068 | for (i = 0; i < lv->lv_niovecs; i++) { | |
2069 | int dumplen = min(vec->i_len, 32); | |
2070 | ||
2071 | xfs_warn(mp, " iovec[%d]", i); | |
2072 | xfs_warn(mp, " type = 0x%x", vec->i_type); | |
2073 | xfs_warn(mp, " len = %d", vec->i_len); | |
2074 | xfs_warn(mp, " first %d bytes of iovec[%d]:", dumplen, i); | |
244e3dea | 2075 | xfs_hex_dump(vec->i_addr, dumplen); |
d4ca1d55 BF |
2076 | |
2077 | vec++; | |
2078 | } | |
2079 | } | |
2080 | } | |
2081 | ||
b5203cd0 DC |
2082 | /* |
2083 | * Calculate the potential space needed by the log vector. Each region gets | |
2084 | * its own xlog_op_header_t and may need to be double word aligned. | |
2085 | */ | |
2086 | static int | |
2087 | xlog_write_calc_vec_length( | |
2088 | struct xlog_ticket *ticket, | |
55b66332 | 2089 | struct xfs_log_vec *log_vector) |
b5203cd0 | 2090 | { |
55b66332 | 2091 | struct xfs_log_vec *lv; |
b5203cd0 DC |
2092 | int headers = 0; |
2093 | int len = 0; | |
2094 | int i; | |
2095 | ||
2096 | /* acct for start rec of xact */ | |
2097 | if (ticket->t_flags & XLOG_TIC_INITED) | |
2098 | headers++; | |
2099 | ||
55b66332 | 2100 | for (lv = log_vector; lv; lv = lv->lv_next) { |
fd63875c DC |
2101 | /* we don't write ordered log vectors */ |
2102 | if (lv->lv_buf_len == XFS_LOG_VEC_ORDERED) | |
2103 | continue; | |
2104 | ||
55b66332 DC |
2105 | headers += lv->lv_niovecs; |
2106 | ||
2107 | for (i = 0; i < lv->lv_niovecs; i++) { | |
2108 | struct xfs_log_iovec *vecp = &lv->lv_iovecp[i]; | |
b5203cd0 | 2109 | |
55b66332 DC |
2110 | len += vecp->i_len; |
2111 | xlog_tic_add_region(ticket, vecp->i_len, vecp->i_type); | |
2112 | } | |
b5203cd0 DC |
2113 | } |
2114 | ||
2115 | ticket->t_res_num_ophdrs += headers; | |
2116 | len += headers * sizeof(struct xlog_op_header); | |
2117 | ||
2118 | return len; | |
2119 | } | |
2120 | ||
2121 | /* | |
2122 | * If first write for transaction, insert start record We can't be trying to | |
2123 | * commit if we are inited. We can't have any "partial_copy" if we are inited. | |
2124 | */ | |
2125 | static int | |
2126 | xlog_write_start_rec( | |
e6b1f273 | 2127 | struct xlog_op_header *ophdr, |
b5203cd0 DC |
2128 | struct xlog_ticket *ticket) |
2129 | { | |
b5203cd0 DC |
2130 | if (!(ticket->t_flags & XLOG_TIC_INITED)) |
2131 | return 0; | |
2132 | ||
2133 | ophdr->oh_tid = cpu_to_be32(ticket->t_tid); | |
2134 | ophdr->oh_clientid = ticket->t_clientid; | |
2135 | ophdr->oh_len = 0; | |
2136 | ophdr->oh_flags = XLOG_START_TRANS; | |
2137 | ophdr->oh_res2 = 0; | |
2138 | ||
2139 | ticket->t_flags &= ~XLOG_TIC_INITED; | |
2140 | ||
2141 | return sizeof(struct xlog_op_header); | |
2142 | } | |
2143 | ||
2144 | static xlog_op_header_t * | |
2145 | xlog_write_setup_ophdr( | |
ad223e60 | 2146 | struct xlog *log, |
e6b1f273 | 2147 | struct xlog_op_header *ophdr, |
b5203cd0 DC |
2148 | struct xlog_ticket *ticket, |
2149 | uint flags) | |
2150 | { | |
b5203cd0 DC |
2151 | ophdr->oh_tid = cpu_to_be32(ticket->t_tid); |
2152 | ophdr->oh_clientid = ticket->t_clientid; | |
2153 | ophdr->oh_res2 = 0; | |
2154 | ||
2155 | /* are we copying a commit or unmount record? */ | |
2156 | ophdr->oh_flags = flags; | |
2157 | ||
2158 | /* | |
2159 | * We've seen logs corrupted with bad transaction client ids. This | |
2160 | * makes sure that XFS doesn't generate them on. Turn this into an EIO | |
2161 | * and shut down the filesystem. | |
2162 | */ | |
2163 | switch (ophdr->oh_clientid) { | |
2164 | case XFS_TRANSACTION: | |
2165 | case XFS_VOLUME: | |
2166 | case XFS_LOG: | |
2167 | break; | |
2168 | default: | |
a0fa2b67 | 2169 | xfs_warn(log->l_mp, |
c9690043 | 2170 | "Bad XFS transaction clientid 0x%x in ticket "PTR_FMT, |
b5203cd0 DC |
2171 | ophdr->oh_clientid, ticket); |
2172 | return NULL; | |
2173 | } | |
2174 | ||
2175 | return ophdr; | |
2176 | } | |
2177 | ||
2178 | /* | |
2179 | * Set up the parameters of the region copy into the log. This has | |
2180 | * to handle region write split across multiple log buffers - this | |
2181 | * state is kept external to this function so that this code can | |
ac0e300f | 2182 | * be written in an obvious, self documenting manner. |
b5203cd0 DC |
2183 | */ |
2184 | static int | |
2185 | xlog_write_setup_copy( | |
2186 | struct xlog_ticket *ticket, | |
2187 | struct xlog_op_header *ophdr, | |
2188 | int space_available, | |
2189 | int space_required, | |
2190 | int *copy_off, | |
2191 | int *copy_len, | |
2192 | int *last_was_partial_copy, | |
2193 | int *bytes_consumed) | |
2194 | { | |
2195 | int still_to_copy; | |
2196 | ||
2197 | still_to_copy = space_required - *bytes_consumed; | |
2198 | *copy_off = *bytes_consumed; | |
2199 | ||
2200 | if (still_to_copy <= space_available) { | |
2201 | /* write of region completes here */ | |
2202 | *copy_len = still_to_copy; | |
2203 | ophdr->oh_len = cpu_to_be32(*copy_len); | |
2204 | if (*last_was_partial_copy) | |
2205 | ophdr->oh_flags |= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); | |
2206 | *last_was_partial_copy = 0; | |
2207 | *bytes_consumed = 0; | |
2208 | return 0; | |
2209 | } | |
2210 | ||
2211 | /* partial write of region, needs extra log op header reservation */ | |
2212 | *copy_len = space_available; | |
2213 | ophdr->oh_len = cpu_to_be32(*copy_len); | |
2214 | ophdr->oh_flags |= XLOG_CONTINUE_TRANS; | |
2215 | if (*last_was_partial_copy) | |
2216 | ophdr->oh_flags |= XLOG_WAS_CONT_TRANS; | |
2217 | *bytes_consumed += *copy_len; | |
2218 | (*last_was_partial_copy)++; | |
2219 | ||
2220 | /* account for new log op header */ | |
2221 | ticket->t_curr_res -= sizeof(struct xlog_op_header); | |
2222 | ticket->t_res_num_ophdrs++; | |
2223 | ||
2224 | return sizeof(struct xlog_op_header); | |
2225 | } | |
2226 | ||
2227 | static int | |
2228 | xlog_write_copy_finish( | |
ad223e60 | 2229 | struct xlog *log, |
b5203cd0 DC |
2230 | struct xlog_in_core *iclog, |
2231 | uint flags, | |
2232 | int *record_cnt, | |
2233 | int *data_cnt, | |
2234 | int *partial_copy, | |
2235 | int *partial_copy_len, | |
2236 | int log_offset, | |
2237 | struct xlog_in_core **commit_iclog) | |
2238 | { | |
2239 | if (*partial_copy) { | |
2240 | /* | |
2241 | * This iclog has already been marked WANT_SYNC by | |
2242 | * xlog_state_get_iclog_space. | |
2243 | */ | |
2244 | xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt); | |
2245 | *record_cnt = 0; | |
2246 | *data_cnt = 0; | |
2247 | return xlog_state_release_iclog(log, iclog); | |
2248 | } | |
2249 | ||
2250 | *partial_copy = 0; | |
2251 | *partial_copy_len = 0; | |
2252 | ||
2253 | if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { | |
2254 | /* no more space in this iclog - push it. */ | |
2255 | xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt); | |
2256 | *record_cnt = 0; | |
2257 | *data_cnt = 0; | |
2258 | ||
2259 | spin_lock(&log->l_icloglock); | |
2260 | xlog_state_want_sync(log, iclog); | |
2261 | spin_unlock(&log->l_icloglock); | |
2262 | ||
2263 | if (!commit_iclog) | |
2264 | return xlog_state_release_iclog(log, iclog); | |
2265 | ASSERT(flags & XLOG_COMMIT_TRANS); | |
2266 | *commit_iclog = iclog; | |
2267 | } | |
2268 | ||
2269 | return 0; | |
2270 | } | |
2271 | ||
1da177e4 LT |
2272 | /* |
2273 | * Write some region out to in-core log | |
2274 | * | |
2275 | * This will be called when writing externally provided regions or when | |
2276 | * writing out a commit record for a given transaction. | |
2277 | * | |
2278 | * General algorithm: | |
2279 | * 1. Find total length of this write. This may include adding to the | |
2280 | * lengths passed in. | |
2281 | * 2. Check whether we violate the tickets reservation. | |
2282 | * 3. While writing to this iclog | |
2283 | * A. Reserve as much space in this iclog as can get | |
2284 | * B. If this is first write, save away start lsn | |
2285 | * C. While writing this region: | |
2286 | * 1. If first write of transaction, write start record | |
2287 | * 2. Write log operation header (header per region) | |
2288 | * 3. Find out if we can fit entire region into this iclog | |
2289 | * 4. Potentially, verify destination memcpy ptr | |
2290 | * 5. Memcpy (partial) region | |
2291 | * 6. If partial copy, release iclog; otherwise, continue | |
2292 | * copying more regions into current iclog | |
2293 | * 4. Mark want sync bit (in simulation mode) | |
2294 | * 5. Release iclog for potential flush to on-disk log. | |
2295 | * | |
2296 | * ERRORS: | |
2297 | * 1. Panic if reservation is overrun. This should never happen since | |
2298 | * reservation amounts are generated internal to the filesystem. | |
2299 | * NOTES: | |
2300 | * 1. Tickets are single threaded data structures. | |
2301 | * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the | |
2302 | * syncing routine. When a single log_write region needs to span | |
2303 | * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set | |
2304 | * on all log operation writes which don't contain the end of the | |
2305 | * region. The XLOG_END_TRANS bit is used for the in-core log | |
2306 | * operation which contains the end of the continued log_write region. | |
2307 | * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog, | |
2308 | * we don't really know exactly how much space will be used. As a result, | |
2309 | * we don't update ic_offset until the end when we know exactly how many | |
2310 | * bytes have been written out. | |
2311 | */ | |
71e330b5 | 2312 | int |
35a8a72f | 2313 | xlog_write( |
ad223e60 | 2314 | struct xlog *log, |
55b66332 | 2315 | struct xfs_log_vec *log_vector, |
35a8a72f CH |
2316 | struct xlog_ticket *ticket, |
2317 | xfs_lsn_t *start_lsn, | |
2318 | struct xlog_in_core **commit_iclog, | |
2319 | uint flags) | |
1da177e4 | 2320 | { |
99428ad0 | 2321 | struct xlog_in_core *iclog = NULL; |
55b66332 DC |
2322 | struct xfs_log_iovec *vecp; |
2323 | struct xfs_log_vec *lv; | |
99428ad0 CH |
2324 | int len; |
2325 | int index; | |
2326 | int partial_copy = 0; | |
2327 | int partial_copy_len = 0; | |
2328 | int contwr = 0; | |
2329 | int record_cnt = 0; | |
2330 | int data_cnt = 0; | |
2331 | int error; | |
2332 | ||
2333 | *start_lsn = 0; | |
2334 | ||
55b66332 | 2335 | len = xlog_write_calc_vec_length(ticket, log_vector); |
71e330b5 | 2336 | |
93b8a585 CH |
2337 | /* |
2338 | * Region headers and bytes are already accounted for. | |
2339 | * We only need to take into account start records and | |
2340 | * split regions in this function. | |
2341 | */ | |
2342 | if (ticket->t_flags & XLOG_TIC_INITED) | |
2343 | ticket->t_curr_res -= sizeof(xlog_op_header_t); | |
2344 | ||
2345 | /* | |
2346 | * Commit record headers need to be accounted for. These | |
2347 | * come in as separate writes so are easy to detect. | |
2348 | */ | |
2349 | if (flags & (XLOG_COMMIT_TRANS | XLOG_UNMOUNT_TRANS)) | |
2350 | ticket->t_curr_res -= sizeof(xlog_op_header_t); | |
71e330b5 | 2351 | |
7d2d5653 BF |
2352 | if (ticket->t_curr_res < 0) { |
2353 | xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, | |
2354 | "ctx ticket reservation ran out. Need to up reservation"); | |
55b66332 | 2355 | xlog_print_tic_res(log->l_mp, ticket); |
7d2d5653 BF |
2356 | xfs_force_shutdown(log->l_mp, SHUTDOWN_LOG_IO_ERROR); |
2357 | } | |
1da177e4 | 2358 | |
55b66332 DC |
2359 | index = 0; |
2360 | lv = log_vector; | |
2361 | vecp = lv->lv_iovecp; | |
fd63875c | 2362 | while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) { |
e6b1f273 | 2363 | void *ptr; |
99428ad0 | 2364 | int log_offset; |
1da177e4 | 2365 | |
99428ad0 CH |
2366 | error = xlog_state_get_iclog_space(log, len, &iclog, ticket, |
2367 | &contwr, &log_offset); | |
2368 | if (error) | |
2369 | return error; | |
1da177e4 | 2370 | |
99428ad0 | 2371 | ASSERT(log_offset <= iclog->ic_size - 1); |
e6b1f273 | 2372 | ptr = iclog->ic_datap + log_offset; |
1da177e4 | 2373 | |
99428ad0 CH |
2374 | /* start_lsn is the first lsn written to. That's all we need. */ |
2375 | if (!*start_lsn) | |
2376 | *start_lsn = be64_to_cpu(iclog->ic_header.h_lsn); | |
b5203cd0 | 2377 | |
99428ad0 CH |
2378 | /* |
2379 | * This loop writes out as many regions as can fit in the amount | |
2380 | * of space which was allocated by xlog_state_get_iclog_space(). | |
2381 | */ | |
fd63875c DC |
2382 | while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) { |
2383 | struct xfs_log_iovec *reg; | |
99428ad0 CH |
2384 | struct xlog_op_header *ophdr; |
2385 | int start_rec_copy; | |
2386 | int copy_len; | |
2387 | int copy_off; | |
fd63875c DC |
2388 | bool ordered = false; |
2389 | ||
2390 | /* ordered log vectors have no regions to write */ | |
2391 | if (lv->lv_buf_len == XFS_LOG_VEC_ORDERED) { | |
2392 | ASSERT(lv->lv_niovecs == 0); | |
2393 | ordered = true; | |
2394 | goto next_lv; | |
2395 | } | |
99428ad0 | 2396 | |
fd63875c | 2397 | reg = &vecp[index]; |
c8ce540d DW |
2398 | ASSERT(reg->i_len % sizeof(int32_t) == 0); |
2399 | ASSERT((unsigned long)ptr % sizeof(int32_t) == 0); | |
99428ad0 CH |
2400 | |
2401 | start_rec_copy = xlog_write_start_rec(ptr, ticket); | |
2402 | if (start_rec_copy) { | |
2403 | record_cnt++; | |
e6b1f273 | 2404 | xlog_write_adv_cnt(&ptr, &len, &log_offset, |
99428ad0 CH |
2405 | start_rec_copy); |
2406 | } | |
b5203cd0 | 2407 | |
99428ad0 CH |
2408 | ophdr = xlog_write_setup_ophdr(log, ptr, ticket, flags); |
2409 | if (!ophdr) | |
2451337d | 2410 | return -EIO; |
99428ad0 | 2411 | |
e6b1f273 | 2412 | xlog_write_adv_cnt(&ptr, &len, &log_offset, |
99428ad0 CH |
2413 | sizeof(struct xlog_op_header)); |
2414 | ||
2415 | len += xlog_write_setup_copy(ticket, ophdr, | |
2416 | iclog->ic_size-log_offset, | |
55b66332 | 2417 | reg->i_len, |
99428ad0 CH |
2418 | ©_off, ©_len, |
2419 | &partial_copy, | |
2420 | &partial_copy_len); | |
2421 | xlog_verify_dest_ptr(log, ptr); | |
2422 | ||
91f9f5fe ES |
2423 | /* |
2424 | * Copy region. | |
2425 | * | |
2426 | * Unmount records just log an opheader, so can have | |
2427 | * empty payloads with no data region to copy. Hence we | |
2428 | * only copy the payload if the vector says it has data | |
2429 | * to copy. | |
2430 | */ | |
99428ad0 | 2431 | ASSERT(copy_len >= 0); |
91f9f5fe ES |
2432 | if (copy_len > 0) { |
2433 | memcpy(ptr, reg->i_addr + copy_off, copy_len); | |
2434 | xlog_write_adv_cnt(&ptr, &len, &log_offset, | |
2435 | copy_len); | |
2436 | } | |
99428ad0 CH |
2437 | copy_len += start_rec_copy + sizeof(xlog_op_header_t); |
2438 | record_cnt++; | |
2439 | data_cnt += contwr ? copy_len : 0; | |
2440 | ||
2441 | error = xlog_write_copy_finish(log, iclog, flags, | |
2442 | &record_cnt, &data_cnt, | |
2443 | &partial_copy, | |
2444 | &partial_copy_len, | |
2445 | log_offset, | |
2446 | commit_iclog); | |
2447 | if (error) | |
2448 | return error; | |
2449 | ||
2450 | /* | |
2451 | * if we had a partial copy, we need to get more iclog | |
2452 | * space but we don't want to increment the region | |
2453 | * index because there is still more is this region to | |
2454 | * write. | |
2455 | * | |
2456 | * If we completed writing this region, and we flushed | |
2457 | * the iclog (indicated by resetting of the record | |
2458 | * count), then we also need to get more log space. If | |
2459 | * this was the last record, though, we are done and | |
2460 | * can just return. | |
2461 | */ | |
2462 | if (partial_copy) | |
2463 | break; | |
2464 | ||
55b66332 | 2465 | if (++index == lv->lv_niovecs) { |
fd63875c | 2466 | next_lv: |
55b66332 DC |
2467 | lv = lv->lv_next; |
2468 | index = 0; | |
2469 | if (lv) | |
2470 | vecp = lv->lv_iovecp; | |
2471 | } | |
749f24f3 | 2472 | if (record_cnt == 0 && !ordered) { |
55b66332 | 2473 | if (!lv) |
99428ad0 CH |
2474 | return 0; |
2475 | break; | |
2476 | } | |
2477 | } | |
2478 | } | |
2479 | ||
2480 | ASSERT(len == 0); | |
2481 | ||
2482 | xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); | |
2483 | if (!commit_iclog) | |
2484 | return xlog_state_release_iclog(log, iclog); | |
1da177e4 | 2485 | |
1da177e4 LT |
2486 | ASSERT(flags & XLOG_COMMIT_TRANS); |
2487 | *commit_iclog = iclog; | |
2488 | return 0; | |
99428ad0 | 2489 | } |
1da177e4 LT |
2490 | |
2491 | ||
2492 | /***************************************************************************** | |
2493 | * | |
2494 | * State Machine functions | |
2495 | * | |
2496 | ***************************************************************************** | |
2497 | */ | |
2498 | ||
2499 | /* Clean iclogs starting from the head. This ordering must be | |
2500 | * maintained, so an iclog doesn't become ACTIVE beyond one that | |
2501 | * is SYNCING. This is also required to maintain the notion that we use | |
12017faf | 2502 | * a ordered wait queue to hold off would be writers to the log when every |
1da177e4 LT |
2503 | * iclog is trying to sync to disk. |
2504 | * | |
2505 | * State Change: DIRTY -> ACTIVE | |
2506 | */ | |
ba0f32d4 | 2507 | STATIC void |
9a8d2fdb MT |
2508 | xlog_state_clean_log( |
2509 | struct xlog *log) | |
1da177e4 LT |
2510 | { |
2511 | xlog_in_core_t *iclog; | |
2512 | int changed = 0; | |
2513 | ||
2514 | iclog = log->l_iclog; | |
2515 | do { | |
2516 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
2517 | iclog->ic_state = XLOG_STATE_ACTIVE; | |
2518 | iclog->ic_offset = 0; | |
89ae379d | 2519 | ASSERT(list_empty_careful(&iclog->ic_callbacks)); |
1da177e4 LT |
2520 | /* |
2521 | * If the number of ops in this iclog indicate it just | |
2522 | * contains the dummy transaction, we can | |
2523 | * change state into IDLE (the second time around). | |
2524 | * Otherwise we should change the state into | |
2525 | * NEED a dummy. | |
2526 | * We don't need to cover the dummy. | |
2527 | */ | |
2528 | if (!changed && | |
b53e675d CH |
2529 | (be32_to_cpu(iclog->ic_header.h_num_logops) == |
2530 | XLOG_COVER_OPS)) { | |
1da177e4 LT |
2531 | changed = 1; |
2532 | } else { | |
2533 | /* | |
2534 | * We have two dirty iclogs so start over | |
2535 | * This could also be num of ops indicates | |
2536 | * this is not the dummy going out. | |
2537 | */ | |
2538 | changed = 2; | |
2539 | } | |
2540 | iclog->ic_header.h_num_logops = 0; | |
2541 | memset(iclog->ic_header.h_cycle_data, 0, | |
2542 | sizeof(iclog->ic_header.h_cycle_data)); | |
2543 | iclog->ic_header.h_lsn = 0; | |
2544 | } else if (iclog->ic_state == XLOG_STATE_ACTIVE) | |
2545 | /* do nothing */; | |
2546 | else | |
2547 | break; /* stop cleaning */ | |
2548 | iclog = iclog->ic_next; | |
2549 | } while (iclog != log->l_iclog); | |
2550 | ||
2551 | /* log is locked when we are called */ | |
2552 | /* | |
2553 | * Change state for the dummy log recording. | |
2554 | * We usually go to NEED. But we go to NEED2 if the changed indicates | |
2555 | * we are done writing the dummy record. | |
2556 | * If we are done with the second dummy recored (DONE2), then | |
2557 | * we go to IDLE. | |
2558 | */ | |
2559 | if (changed) { | |
2560 | switch (log->l_covered_state) { | |
2561 | case XLOG_STATE_COVER_IDLE: | |
2562 | case XLOG_STATE_COVER_NEED: | |
2563 | case XLOG_STATE_COVER_NEED2: | |
2564 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2565 | break; | |
2566 | ||
2567 | case XLOG_STATE_COVER_DONE: | |
2568 | if (changed == 1) | |
2569 | log->l_covered_state = XLOG_STATE_COVER_NEED2; | |
2570 | else | |
2571 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2572 | break; | |
2573 | ||
2574 | case XLOG_STATE_COVER_DONE2: | |
2575 | if (changed == 1) | |
2576 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
2577 | else | |
2578 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2579 | break; | |
2580 | ||
2581 | default: | |
2582 | ASSERT(0); | |
2583 | } | |
2584 | } | |
2585 | } /* xlog_state_clean_log */ | |
2586 | ||
2587 | STATIC xfs_lsn_t | |
2588 | xlog_get_lowest_lsn( | |
9bff3132 | 2589 | struct xlog *log) |
1da177e4 | 2590 | { |
9bff3132 CH |
2591 | struct xlog_in_core *iclog = log->l_iclog; |
2592 | xfs_lsn_t lowest_lsn = 0, lsn; | |
1da177e4 | 2593 | |
1da177e4 | 2594 | do { |
9bff3132 CH |
2595 | if (iclog->ic_state & (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY)) |
2596 | continue; | |
2597 | ||
2598 | lsn = be64_to_cpu(iclog->ic_header.h_lsn); | |
2599 | if ((lsn && !lowest_lsn) || XFS_LSN_CMP(lsn, lowest_lsn) < 0) | |
1da177e4 | 2600 | lowest_lsn = lsn; |
9bff3132 CH |
2601 | } while ((iclog = iclog->ic_next) != log->l_iclog); |
2602 | ||
014c2544 | 2603 | return lowest_lsn; |
1da177e4 LT |
2604 | } |
2605 | ||
1da177e4 LT |
2606 | STATIC void |
2607 | xlog_state_do_callback( | |
9a8d2fdb | 2608 | struct xlog *log, |
d15cbf2f | 2609 | bool aborted, |
9a8d2fdb | 2610 | struct xlog_in_core *ciclog) |
1da177e4 LT |
2611 | { |
2612 | xlog_in_core_t *iclog; | |
2613 | xlog_in_core_t *first_iclog; /* used to know when we've | |
2614 | * processed all iclogs once */ | |
1da177e4 LT |
2615 | int flushcnt = 0; |
2616 | xfs_lsn_t lowest_lsn; | |
2617 | int ioerrors; /* counter: iclogs with errors */ | |
2618 | int loopdidcallbacks; /* flag: inner loop did callbacks*/ | |
2619 | int funcdidcallbacks; /* flag: function did callbacks */ | |
2620 | int repeats; /* for issuing console warnings if | |
2621 | * looping too many times */ | |
d748c623 | 2622 | int wake = 0; |
1da177e4 | 2623 | |
b22cd72c | 2624 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2625 | first_iclog = iclog = log->l_iclog; |
2626 | ioerrors = 0; | |
2627 | funcdidcallbacks = 0; | |
2628 | repeats = 0; | |
2629 | ||
2630 | do { | |
2631 | /* | |
2632 | * Scan all iclogs starting with the one pointed to by the | |
2633 | * log. Reset this starting point each time the log is | |
2634 | * unlocked (during callbacks). | |
2635 | * | |
2636 | * Keep looping through iclogs until one full pass is made | |
2637 | * without running any callbacks. | |
2638 | */ | |
2639 | first_iclog = log->l_iclog; | |
2640 | iclog = log->l_iclog; | |
2641 | loopdidcallbacks = 0; | |
2642 | repeats++; | |
2643 | ||
2644 | do { | |
2645 | ||
2646 | /* skip all iclogs in the ACTIVE & DIRTY states */ | |
2647 | if (iclog->ic_state & | |
2648 | (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) { | |
2649 | iclog = iclog->ic_next; | |
2650 | continue; | |
2651 | } | |
2652 | ||
2653 | /* | |
2654 | * Between marking a filesystem SHUTDOWN and stopping | |
2655 | * the log, we do flush all iclogs to disk (if there | |
2656 | * wasn't a log I/O error). So, we do want things to | |
2657 | * go smoothly in case of just a SHUTDOWN w/o a | |
2658 | * LOG_IO_ERROR. | |
2659 | */ | |
2660 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
2661 | /* | |
2662 | * Can only perform callbacks in order. Since | |
2663 | * this iclog is not in the DONE_SYNC/ | |
2664 | * DO_CALLBACK state, we skip the rest and | |
2665 | * just try to clean up. If we set our iclog | |
2666 | * to DO_CALLBACK, we will not process it when | |
2667 | * we retry since a previous iclog is in the | |
2668 | * CALLBACK and the state cannot change since | |
b22cd72c | 2669 | * we are holding the l_icloglock. |
1da177e4 LT |
2670 | */ |
2671 | if (!(iclog->ic_state & | |
2672 | (XLOG_STATE_DONE_SYNC | | |
2673 | XLOG_STATE_DO_CALLBACK))) { | |
2674 | if (ciclog && (ciclog->ic_state == | |
2675 | XLOG_STATE_DONE_SYNC)) { | |
2676 | ciclog->ic_state = XLOG_STATE_DO_CALLBACK; | |
2677 | } | |
2678 | break; | |
2679 | } | |
2680 | /* | |
2681 | * We now have an iclog that is in either the | |
2682 | * DO_CALLBACK or DONE_SYNC states. The other | |
2683 | * states (WANT_SYNC, SYNCING, or CALLBACK were | |
2684 | * caught by the above if and are going to | |
2685 | * clean (i.e. we aren't doing their callbacks) | |
2686 | * see the above if. | |
2687 | */ | |
2688 | ||
2689 | /* | |
2690 | * We will do one more check here to see if we | |
2691 | * have chased our tail around. | |
2692 | */ | |
2693 | ||
2694 | lowest_lsn = xlog_get_lowest_lsn(log); | |
b53e675d CH |
2695 | if (lowest_lsn && |
2696 | XFS_LSN_CMP(lowest_lsn, | |
84f3c683 | 2697 | be64_to_cpu(iclog->ic_header.h_lsn)) < 0) { |
1da177e4 LT |
2698 | iclog = iclog->ic_next; |
2699 | continue; /* Leave this iclog for | |
2700 | * another thread */ | |
2701 | } | |
2702 | ||
2703 | iclog->ic_state = XLOG_STATE_CALLBACK; | |
2704 | ||
1da177e4 | 2705 | |
84f3c683 | 2706 | /* |
d35e88fa DC |
2707 | * Completion of a iclog IO does not imply that |
2708 | * a transaction has completed, as transactions | |
2709 | * can be large enough to span many iclogs. We | |
2710 | * cannot change the tail of the log half way | |
2711 | * through a transaction as this may be the only | |
2712 | * transaction in the log and moving th etail to | |
2713 | * point to the middle of it will prevent | |
2714 | * recovery from finding the start of the | |
2715 | * transaction. Hence we should only update the | |
2716 | * last_sync_lsn if this iclog contains | |
2717 | * transaction completion callbacks on it. | |
2718 | * | |
2719 | * We have to do this before we drop the | |
84f3c683 DC |
2720 | * icloglock to ensure we are the only one that |
2721 | * can update it. | |
1da177e4 | 2722 | */ |
84f3c683 DC |
2723 | ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn), |
2724 | be64_to_cpu(iclog->ic_header.h_lsn)) <= 0); | |
89ae379d | 2725 | if (!list_empty_careful(&iclog->ic_callbacks)) |
d35e88fa DC |
2726 | atomic64_set(&log->l_last_sync_lsn, |
2727 | be64_to_cpu(iclog->ic_header.h_lsn)); | |
1da177e4 | 2728 | |
84f3c683 | 2729 | } else |
1da177e4 | 2730 | ioerrors++; |
84f3c683 DC |
2731 | |
2732 | spin_unlock(&log->l_icloglock); | |
1da177e4 | 2733 | |
114d23aa DC |
2734 | /* |
2735 | * Keep processing entries in the callback list until | |
2736 | * we come around and it is empty. We need to | |
2737 | * atomically see that the list is empty and change the | |
2738 | * state to DIRTY so that we don't miss any more | |
2739 | * callbacks being added. | |
2740 | */ | |
2741 | spin_lock(&iclog->ic_callback_lock); | |
89ae379d CH |
2742 | while (!list_empty(&iclog->ic_callbacks)) { |
2743 | LIST_HEAD(tmp); | |
1da177e4 | 2744 | |
89ae379d CH |
2745 | list_splice_init(&iclog->ic_callbacks, &tmp); |
2746 | ||
2747 | spin_unlock(&iclog->ic_callback_lock); | |
2748 | xlog_cil_process_committed(&tmp, aborted); | |
114d23aa | 2749 | spin_lock(&iclog->ic_callback_lock); |
1da177e4 LT |
2750 | } |
2751 | ||
2752 | loopdidcallbacks++; | |
2753 | funcdidcallbacks++; | |
2754 | ||
114d23aa | 2755 | spin_lock(&log->l_icloglock); |
114d23aa | 2756 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 LT |
2757 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) |
2758 | iclog->ic_state = XLOG_STATE_DIRTY; | |
2759 | ||
2760 | /* | |
2761 | * Transition from DIRTY to ACTIVE if applicable. | |
2762 | * NOP if STATE_IOERROR. | |
2763 | */ | |
2764 | xlog_state_clean_log(log); | |
2765 | ||
2766 | /* wake up threads waiting in xfs_log_force() */ | |
eb40a875 | 2767 | wake_up_all(&iclog->ic_force_wait); |
1da177e4 LT |
2768 | |
2769 | iclog = iclog->ic_next; | |
2770 | } while (first_iclog != iclog); | |
a3c6685e NS |
2771 | |
2772 | if (repeats > 5000) { | |
2773 | flushcnt += repeats; | |
2774 | repeats = 0; | |
a0fa2b67 | 2775 | xfs_warn(log->l_mp, |
a3c6685e | 2776 | "%s: possible infinite loop (%d iterations)", |
34a622b2 | 2777 | __func__, flushcnt); |
1da177e4 LT |
2778 | } |
2779 | } while (!ioerrors && loopdidcallbacks); | |
2780 | ||
609adfc2 | 2781 | #ifdef DEBUG |
1da177e4 | 2782 | /* |
609adfc2 BF |
2783 | * Make one last gasp attempt to see if iclogs are being left in limbo. |
2784 | * If the above loop finds an iclog earlier than the current iclog and | |
2785 | * in one of the syncing states, the current iclog is put into | |
2786 | * DO_CALLBACK and the callbacks are deferred to the completion of the | |
2787 | * earlier iclog. Walk the iclogs in order and make sure that no iclog | |
2788 | * is in DO_CALLBACK unless an earlier iclog is in one of the syncing | |
2789 | * states. | |
2790 | * | |
2791 | * Note that SYNCING|IOABORT is a valid state so we cannot just check | |
2792 | * for ic_state == SYNCING. | |
1da177e4 | 2793 | */ |
1da177e4 LT |
2794 | if (funcdidcallbacks) { |
2795 | first_iclog = iclog = log->l_iclog; | |
2796 | do { | |
2797 | ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); | |
2798 | /* | |
2799 | * Terminate the loop if iclogs are found in states | |
2800 | * which will cause other threads to clean up iclogs. | |
2801 | * | |
2802 | * SYNCING - i/o completion will go through logs | |
2803 | * DONE_SYNC - interrupt thread should be waiting for | |
b22cd72c | 2804 | * l_icloglock |
1da177e4 LT |
2805 | * IOERROR - give up hope all ye who enter here |
2806 | */ | |
2807 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC || | |
609adfc2 | 2808 | iclog->ic_state & XLOG_STATE_SYNCING || |
1da177e4 LT |
2809 | iclog->ic_state == XLOG_STATE_DONE_SYNC || |
2810 | iclog->ic_state == XLOG_STATE_IOERROR ) | |
2811 | break; | |
2812 | iclog = iclog->ic_next; | |
2813 | } while (first_iclog != iclog); | |
2814 | } | |
2815 | #endif | |
2816 | ||
d748c623 MW |
2817 | if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) |
2818 | wake = 1; | |
b22cd72c | 2819 | spin_unlock(&log->l_icloglock); |
d748c623 MW |
2820 | |
2821 | if (wake) | |
eb40a875 | 2822 | wake_up_all(&log->l_flush_wait); |
d748c623 | 2823 | } |
1da177e4 LT |
2824 | |
2825 | ||
2826 | /* | |
2827 | * Finish transitioning this iclog to the dirty state. | |
2828 | * | |
2829 | * Make sure that we completely execute this routine only when this is | |
2830 | * the last call to the iclog. There is a good chance that iclog flushes, | |
2831 | * when we reach the end of the physical log, get turned into 2 separate | |
2832 | * calls to bwrite. Hence, one iclog flush could generate two calls to this | |
2833 | * routine. By using the reference count bwritecnt, we guarantee that only | |
2834 | * the second completion goes through. | |
2835 | * | |
2836 | * Callbacks could take time, so they are done outside the scope of the | |
12017faf | 2837 | * global state machine log lock. |
1da177e4 | 2838 | */ |
a8272ce0 | 2839 | STATIC void |
1da177e4 | 2840 | xlog_state_done_syncing( |
d15cbf2f CH |
2841 | struct xlog_in_core *iclog, |
2842 | bool aborted) | |
1da177e4 | 2843 | { |
d15cbf2f | 2844 | struct xlog *log = iclog->ic_log; |
1da177e4 | 2845 | |
b22cd72c | 2846 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2847 | |
2848 | ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || | |
2849 | iclog->ic_state == XLOG_STATE_IOERROR); | |
155cc6b7 | 2850 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 LT |
2851 | |
2852 | /* | |
2853 | * If we got an error, either on the first buffer, or in the case of | |
2854 | * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, | |
2855 | * and none should ever be attempted to be written to disk | |
2856 | * again. | |
2857 | */ | |
79b54d9b | 2858 | if (iclog->ic_state != XLOG_STATE_IOERROR) |
1da177e4 | 2859 | iclog->ic_state = XLOG_STATE_DONE_SYNC; |
1da177e4 LT |
2860 | |
2861 | /* | |
2862 | * Someone could be sleeping prior to writing out the next | |
2863 | * iclog buffer, we wake them all, one will get to do the | |
2864 | * I/O, the others get to wait for the result. | |
2865 | */ | |
eb40a875 | 2866 | wake_up_all(&iclog->ic_write_wait); |
b22cd72c | 2867 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2868 | xlog_state_do_callback(log, aborted, iclog); /* also cleans log */ |
2869 | } /* xlog_state_done_syncing */ | |
2870 | ||
2871 | ||
2872 | /* | |
2873 | * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must | |
12017faf DC |
2874 | * sleep. We wait on the flush queue on the head iclog as that should be |
2875 | * the first iclog to complete flushing. Hence if all iclogs are syncing, | |
2876 | * we will wait here and all new writes will sleep until a sync completes. | |
1da177e4 LT |
2877 | * |
2878 | * The in-core logs are used in a circular fashion. They are not used | |
2879 | * out-of-order even when an iclog past the head is free. | |
2880 | * | |
2881 | * return: | |
2882 | * * log_offset where xlog_write() can start writing into the in-core | |
2883 | * log's data space. | |
2884 | * * in-core log pointer to which xlog_write() should write. | |
2885 | * * boolean indicating this is a continued write to an in-core log. | |
2886 | * If this is the last write, then the in-core log's offset field | |
2887 | * needs to be incremented, depending on the amount of data which | |
2888 | * is copied. | |
2889 | */ | |
a8272ce0 | 2890 | STATIC int |
9a8d2fdb MT |
2891 | xlog_state_get_iclog_space( |
2892 | struct xlog *log, | |
2893 | int len, | |
2894 | struct xlog_in_core **iclogp, | |
2895 | struct xlog_ticket *ticket, | |
2896 | int *continued_write, | |
2897 | int *logoffsetp) | |
1da177e4 | 2898 | { |
1da177e4 LT |
2899 | int log_offset; |
2900 | xlog_rec_header_t *head; | |
2901 | xlog_in_core_t *iclog; | |
2902 | int error; | |
2903 | ||
2904 | restart: | |
b22cd72c | 2905 | spin_lock(&log->l_icloglock); |
1da177e4 | 2906 | if (XLOG_FORCED_SHUTDOWN(log)) { |
b22cd72c | 2907 | spin_unlock(&log->l_icloglock); |
2451337d | 2908 | return -EIO; |
1da177e4 LT |
2909 | } |
2910 | ||
2911 | iclog = log->l_iclog; | |
d748c623 | 2912 | if (iclog->ic_state != XLOG_STATE_ACTIVE) { |
ff6d6af2 | 2913 | XFS_STATS_INC(log->l_mp, xs_log_noiclogs); |
d748c623 MW |
2914 | |
2915 | /* Wait for log writes to have flushed */ | |
eb40a875 | 2916 | xlog_wait(&log->l_flush_wait, &log->l_icloglock); |
1da177e4 LT |
2917 | goto restart; |
2918 | } | |
d748c623 | 2919 | |
1da177e4 LT |
2920 | head = &iclog->ic_header; |
2921 | ||
155cc6b7 | 2922 | atomic_inc(&iclog->ic_refcnt); /* prevents sync */ |
1da177e4 LT |
2923 | log_offset = iclog->ic_offset; |
2924 | ||
2925 | /* On the 1st write to an iclog, figure out lsn. This works | |
2926 | * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are | |
2927 | * committing to. If the offset is set, that's how many blocks | |
2928 | * must be written. | |
2929 | */ | |
2930 | if (log_offset == 0) { | |
2931 | ticket->t_curr_res -= log->l_iclog_hsize; | |
0adba536 | 2932 | xlog_tic_add_region(ticket, |
7e9c6396 TS |
2933 | log->l_iclog_hsize, |
2934 | XLOG_REG_TYPE_LRHEADER); | |
b53e675d CH |
2935 | head->h_cycle = cpu_to_be32(log->l_curr_cycle); |
2936 | head->h_lsn = cpu_to_be64( | |
03bea6fe | 2937 | xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block)); |
1da177e4 LT |
2938 | ASSERT(log->l_curr_block >= 0); |
2939 | } | |
2940 | ||
2941 | /* If there is enough room to write everything, then do it. Otherwise, | |
2942 | * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC | |
2943 | * bit is on, so this will get flushed out. Don't update ic_offset | |
2944 | * until you know exactly how many bytes get copied. Therefore, wait | |
2945 | * until later to update ic_offset. | |
2946 | * | |
2947 | * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's | |
2948 | * can fit into remaining data section. | |
2949 | */ | |
2950 | if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { | |
2951 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2952 | ||
49641f1a DC |
2953 | /* |
2954 | * If I'm the only one writing to this iclog, sync it to disk. | |
2955 | * We need to do an atomic compare and decrement here to avoid | |
2956 | * racing with concurrent atomic_dec_and_lock() calls in | |
2957 | * xlog_state_release_iclog() when there is more than one | |
2958 | * reference to the iclog. | |
2959 | */ | |
2960 | if (!atomic_add_unless(&iclog->ic_refcnt, -1, 1)) { | |
2961 | /* we are the only one */ | |
b22cd72c | 2962 | spin_unlock(&log->l_icloglock); |
49641f1a DC |
2963 | error = xlog_state_release_iclog(log, iclog); |
2964 | if (error) | |
014c2544 | 2965 | return error; |
1da177e4 | 2966 | } else { |
b22cd72c | 2967 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2968 | } |
2969 | goto restart; | |
2970 | } | |
2971 | ||
2972 | /* Do we have enough room to write the full amount in the remainder | |
2973 | * of this iclog? Or must we continue a write on the next iclog and | |
2974 | * mark this iclog as completely taken? In the case where we switch | |
2975 | * iclogs (to mark it taken), this particular iclog will release/sync | |
2976 | * to disk in xlog_write(). | |
2977 | */ | |
2978 | if (len <= iclog->ic_size - iclog->ic_offset) { | |
2979 | *continued_write = 0; | |
2980 | iclog->ic_offset += len; | |
2981 | } else { | |
2982 | *continued_write = 1; | |
2983 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2984 | } | |
2985 | *iclogp = iclog; | |
2986 | ||
2987 | ASSERT(iclog->ic_offset <= iclog->ic_size); | |
b22cd72c | 2988 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2989 | |
2990 | *logoffsetp = log_offset; | |
2991 | return 0; | |
2992 | } /* xlog_state_get_iclog_space */ | |
2993 | ||
1da177e4 LT |
2994 | /* The first cnt-1 times through here we don't need to |
2995 | * move the grant write head because the permanent | |
2996 | * reservation has reserved cnt times the unit amount. | |
2997 | * Release part of current permanent unit reservation and | |
2998 | * reset current reservation to be one units worth. Also | |
2999 | * move grant reservation head forward. | |
3000 | */ | |
3001 | STATIC void | |
9a8d2fdb MT |
3002 | xlog_regrant_reserve_log_space( |
3003 | struct xlog *log, | |
3004 | struct xlog_ticket *ticket) | |
1da177e4 | 3005 | { |
0b1b213f CH |
3006 | trace_xfs_log_regrant_reserve_enter(log, ticket); |
3007 | ||
1da177e4 LT |
3008 | if (ticket->t_cnt > 0) |
3009 | ticket->t_cnt--; | |
3010 | ||
28496968 | 3011 | xlog_grant_sub_space(log, &log->l_reserve_head.grant, |
a69ed03c | 3012 | ticket->t_curr_res); |
28496968 | 3013 | xlog_grant_sub_space(log, &log->l_write_head.grant, |
a69ed03c | 3014 | ticket->t_curr_res); |
1da177e4 | 3015 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 3016 | xlog_tic_reset_res(ticket); |
0b1b213f CH |
3017 | |
3018 | trace_xfs_log_regrant_reserve_sub(log, ticket); | |
3019 | ||
1da177e4 | 3020 | /* just return if we still have some of the pre-reserved space */ |
d0eb2f38 | 3021 | if (ticket->t_cnt > 0) |
1da177e4 | 3022 | return; |
1da177e4 | 3023 | |
28496968 | 3024 | xlog_grant_add_space(log, &log->l_reserve_head.grant, |
a69ed03c | 3025 | ticket->t_unit_res); |
0b1b213f CH |
3026 | |
3027 | trace_xfs_log_regrant_reserve_exit(log, ticket); | |
3028 | ||
1da177e4 | 3029 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 3030 | xlog_tic_reset_res(ticket); |
1da177e4 LT |
3031 | } /* xlog_regrant_reserve_log_space */ |
3032 | ||
3033 | ||
3034 | /* | |
3035 | * Give back the space left from a reservation. | |
3036 | * | |
3037 | * All the information we need to make a correct determination of space left | |
3038 | * is present. For non-permanent reservations, things are quite easy. The | |
3039 | * count should have been decremented to zero. We only need to deal with the | |
3040 | * space remaining in the current reservation part of the ticket. If the | |
3041 | * ticket contains a permanent reservation, there may be left over space which | |
3042 | * needs to be released. A count of N means that N-1 refills of the current | |
3043 | * reservation can be done before we need to ask for more space. The first | |
3044 | * one goes to fill up the first current reservation. Once we run out of | |
3045 | * space, the count will stay at zero and the only space remaining will be | |
3046 | * in the current reservation field. | |
3047 | */ | |
3048 | STATIC void | |
9a8d2fdb MT |
3049 | xlog_ungrant_log_space( |
3050 | struct xlog *log, | |
3051 | struct xlog_ticket *ticket) | |
1da177e4 | 3052 | { |
663e496a DC |
3053 | int bytes; |
3054 | ||
1da177e4 LT |
3055 | if (ticket->t_cnt > 0) |
3056 | ticket->t_cnt--; | |
3057 | ||
0b1b213f | 3058 | trace_xfs_log_ungrant_enter(log, ticket); |
0b1b213f | 3059 | trace_xfs_log_ungrant_sub(log, ticket); |
1da177e4 | 3060 | |
663e496a DC |
3061 | /* |
3062 | * If this is a permanent reservation ticket, we may be able to free | |
1da177e4 LT |
3063 | * up more space based on the remaining count. |
3064 | */ | |
663e496a | 3065 | bytes = ticket->t_curr_res; |
1da177e4 LT |
3066 | if (ticket->t_cnt > 0) { |
3067 | ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); | |
663e496a | 3068 | bytes += ticket->t_unit_res*ticket->t_cnt; |
1da177e4 LT |
3069 | } |
3070 | ||
28496968 CH |
3071 | xlog_grant_sub_space(log, &log->l_reserve_head.grant, bytes); |
3072 | xlog_grant_sub_space(log, &log->l_write_head.grant, bytes); | |
663e496a | 3073 | |
0b1b213f CH |
3074 | trace_xfs_log_ungrant_exit(log, ticket); |
3075 | ||
cfb7cdca | 3076 | xfs_log_space_wake(log->l_mp); |
09a423a3 | 3077 | } |
1da177e4 | 3078 | |
1da177e4 LT |
3079 | /* |
3080 | * Flush iclog to disk if this is the last reference to the given iclog and | |
3081 | * the WANT_SYNC bit is set. | |
3082 | * | |
3083 | * When this function is entered, the iclog is not necessarily in the | |
3084 | * WANT_SYNC state. It may be sitting around waiting to get filled. | |
3085 | * | |
3086 | * | |
3087 | */ | |
a8272ce0 | 3088 | STATIC int |
b589334c | 3089 | xlog_state_release_iclog( |
9a8d2fdb MT |
3090 | struct xlog *log, |
3091 | struct xlog_in_core *iclog) | |
1da177e4 | 3092 | { |
1da177e4 LT |
3093 | int sync = 0; /* do we sync? */ |
3094 | ||
155cc6b7 | 3095 | if (iclog->ic_state & XLOG_STATE_IOERROR) |
2451337d | 3096 | return -EIO; |
155cc6b7 DC |
3097 | |
3098 | ASSERT(atomic_read(&iclog->ic_refcnt) > 0); | |
3099 | if (!atomic_dec_and_lock(&iclog->ic_refcnt, &log->l_icloglock)) | |
3100 | return 0; | |
3101 | ||
1da177e4 | 3102 | if (iclog->ic_state & XLOG_STATE_IOERROR) { |
b22cd72c | 3103 | spin_unlock(&log->l_icloglock); |
2451337d | 3104 | return -EIO; |
1da177e4 | 3105 | } |
1da177e4 LT |
3106 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || |
3107 | iclog->ic_state == XLOG_STATE_WANT_SYNC); | |
3108 | ||
155cc6b7 | 3109 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC) { |
b589334c | 3110 | /* update tail before writing to iclog */ |
1c3cb9ec | 3111 | xfs_lsn_t tail_lsn = xlog_assign_tail_lsn(log->l_mp); |
1da177e4 LT |
3112 | sync++; |
3113 | iclog->ic_state = XLOG_STATE_SYNCING; | |
1c3cb9ec DC |
3114 | iclog->ic_header.h_tail_lsn = cpu_to_be64(tail_lsn); |
3115 | xlog_verify_tail_lsn(log, iclog, tail_lsn); | |
1da177e4 LT |
3116 | /* cycle incremented when incrementing curr_block */ |
3117 | } | |
b22cd72c | 3118 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3119 | |
3120 | /* | |
3121 | * We let the log lock go, so it's possible that we hit a log I/O | |
c41564b5 | 3122 | * error or some other SHUTDOWN condition that marks the iclog |
1da177e4 LT |
3123 | * as XLOG_STATE_IOERROR before the bwrite. However, we know that |
3124 | * this iclog has consistent data, so we ignore IOERROR | |
3125 | * flags after this point. | |
3126 | */ | |
b589334c | 3127 | if (sync) |
94860a30 | 3128 | xlog_sync(log, iclog); |
014c2544 | 3129 | return 0; |
1da177e4 LT |
3130 | } /* xlog_state_release_iclog */ |
3131 | ||
3132 | ||
3133 | /* | |
3134 | * This routine will mark the current iclog in the ring as WANT_SYNC | |
3135 | * and move the current iclog pointer to the next iclog in the ring. | |
3136 | * When this routine is called from xlog_state_get_iclog_space(), the | |
3137 | * exact size of the iclog has not yet been determined. All we know is | |
3138 | * that every data block. We have run out of space in this log record. | |
3139 | */ | |
3140 | STATIC void | |
9a8d2fdb MT |
3141 | xlog_state_switch_iclogs( |
3142 | struct xlog *log, | |
3143 | struct xlog_in_core *iclog, | |
3144 | int eventual_size) | |
1da177e4 LT |
3145 | { |
3146 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); | |
3147 | if (!eventual_size) | |
3148 | eventual_size = iclog->ic_offset; | |
3149 | iclog->ic_state = XLOG_STATE_WANT_SYNC; | |
b53e675d | 3150 | iclog->ic_header.h_prev_block = cpu_to_be32(log->l_prev_block); |
1da177e4 LT |
3151 | log->l_prev_block = log->l_curr_block; |
3152 | log->l_prev_cycle = log->l_curr_cycle; | |
3153 | ||
3154 | /* roll log?: ic_offset changed later */ | |
3155 | log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); | |
3156 | ||
3157 | /* Round up to next log-sunit */ | |
62118709 | 3158 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && |
1da177e4 | 3159 | log->l_mp->m_sb.sb_logsunit > 1) { |
c8ce540d | 3160 | uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); |
1da177e4 LT |
3161 | log->l_curr_block = roundup(log->l_curr_block, sunit_bb); |
3162 | } | |
3163 | ||
3164 | if (log->l_curr_block >= log->l_logBBsize) { | |
a45086e2 BF |
3165 | /* |
3166 | * Rewind the current block before the cycle is bumped to make | |
3167 | * sure that the combined LSN never transiently moves forward | |
3168 | * when the log wraps to the next cycle. This is to support the | |
3169 | * unlocked sample of these fields from xlog_valid_lsn(). Most | |
3170 | * other cases should acquire l_icloglock. | |
3171 | */ | |
3172 | log->l_curr_block -= log->l_logBBsize; | |
3173 | ASSERT(log->l_curr_block >= 0); | |
3174 | smp_wmb(); | |
1da177e4 LT |
3175 | log->l_curr_cycle++; |
3176 | if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) | |
3177 | log->l_curr_cycle++; | |
1da177e4 LT |
3178 | } |
3179 | ASSERT(iclog == log->l_iclog); | |
3180 | log->l_iclog = iclog->ic_next; | |
3181 | } /* xlog_state_switch_iclogs */ | |
3182 | ||
1da177e4 LT |
3183 | /* |
3184 | * Write out all data in the in-core log as of this exact moment in time. | |
3185 | * | |
3186 | * Data may be written to the in-core log during this call. However, | |
3187 | * we don't guarantee this data will be written out. A change from past | |
3188 | * implementation means this routine will *not* write out zero length LRs. | |
3189 | * | |
3190 | * Basically, we try and perform an intelligent scan of the in-core logs. | |
3191 | * If we determine there is no flushable data, we just return. There is no | |
3192 | * flushable data if: | |
3193 | * | |
3194 | * 1. the current iclog is active and has no data; the previous iclog | |
3195 | * is in the active or dirty state. | |
3196 | * 2. the current iclog is drity, and the previous iclog is in the | |
3197 | * active or dirty state. | |
3198 | * | |
12017faf | 3199 | * We may sleep if: |
1da177e4 LT |
3200 | * |
3201 | * 1. the current iclog is not in the active nor dirty state. | |
3202 | * 2. the current iclog dirty, and the previous iclog is not in the | |
3203 | * active nor dirty state. | |
3204 | * 3. the current iclog is active, and there is another thread writing | |
3205 | * to this particular iclog. | |
3206 | * 4. a) the current iclog is active and has no other writers | |
3207 | * b) when we return from flushing out this iclog, it is still | |
3208 | * not in the active nor dirty state. | |
3209 | */ | |
a14a348b | 3210 | int |
60e5bb78 | 3211 | xfs_log_force( |
a14a348b | 3212 | struct xfs_mount *mp, |
60e5bb78 | 3213 | uint flags) |
1da177e4 | 3214 | { |
ad223e60 | 3215 | struct xlog *log = mp->m_log; |
a14a348b CH |
3216 | struct xlog_in_core *iclog; |
3217 | xfs_lsn_t lsn; | |
3218 | ||
ff6d6af2 | 3219 | XFS_STATS_INC(mp, xs_log_force); |
60e5bb78 | 3220 | trace_xfs_log_force(mp, 0, _RET_IP_); |
1da177e4 | 3221 | |
93b8a585 | 3222 | xlog_cil_force(log); |
71e330b5 | 3223 | |
b22cd72c | 3224 | spin_lock(&log->l_icloglock); |
1da177e4 | 3225 | iclog = log->l_iclog; |
e6b96570 CH |
3226 | if (iclog->ic_state & XLOG_STATE_IOERROR) |
3227 | goto out_error; | |
1da177e4 | 3228 | |
e6b96570 CH |
3229 | if (iclog->ic_state == XLOG_STATE_DIRTY || |
3230 | (iclog->ic_state == XLOG_STATE_ACTIVE && | |
3231 | atomic_read(&iclog->ic_refcnt) == 0 && iclog->ic_offset == 0)) { | |
1da177e4 | 3232 | /* |
e6b96570 CH |
3233 | * If the head is dirty or (active and empty), then we need to |
3234 | * look at the previous iclog. | |
3235 | * | |
3236 | * If the previous iclog is active or dirty we are done. There | |
3237 | * is nothing to sync out. Otherwise, we attach ourselves to the | |
1da177e4 LT |
3238 | * previous iclog and go to sleep. |
3239 | */ | |
e6b96570 CH |
3240 | iclog = iclog->ic_prev; |
3241 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
3242 | iclog->ic_state == XLOG_STATE_DIRTY) | |
3243 | goto out_unlock; | |
3244 | } else if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3245 | if (atomic_read(&iclog->ic_refcnt) == 0) { | |
3246 | /* | |
3247 | * We are the only one with access to this iclog. | |
3248 | * | |
3249 | * Flush it out now. There should be a roundoff of zero | |
3250 | * to show that someone has already taken care of the | |
3251 | * roundoff from the previous sync. | |
3252 | */ | |
3253 | atomic_inc(&iclog->ic_refcnt); | |
3254 | lsn = be64_to_cpu(iclog->ic_header.h_lsn); | |
3255 | xlog_state_switch_iclogs(log, iclog, 0); | |
3256 | spin_unlock(&log->l_icloglock); | |
a14a348b | 3257 | |
e6b96570 CH |
3258 | if (xlog_state_release_iclog(log, iclog)) |
3259 | return -EIO; | |
1da177e4 | 3260 | |
e6b96570 CH |
3261 | spin_lock(&log->l_icloglock); |
3262 | if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn || | |
3263 | iclog->ic_state == XLOG_STATE_DIRTY) | |
3264 | goto out_unlock; | |
3265 | } else { | |
3266 | /* | |
3267 | * Someone else is writing to this iclog. | |
3268 | * | |
3269 | * Use its call to flush out the data. However, the | |
3270 | * other thread may not force out this LR, so we mark | |
3271 | * it WANT_SYNC. | |
3272 | */ | |
3273 | xlog_state_switch_iclogs(log, iclog, 0); | |
1da177e4 | 3274 | } |
e6b96570 | 3275 | } else { |
1da177e4 | 3276 | /* |
e6b96570 CH |
3277 | * If the head iclog is not active nor dirty, we just attach |
3278 | * ourselves to the head and go to sleep if necessary. | |
1da177e4 | 3279 | */ |
e6b96570 | 3280 | ; |
1da177e4 | 3281 | } |
e6b96570 CH |
3282 | |
3283 | if (!(flags & XFS_LOG_SYNC)) | |
3284 | goto out_unlock; | |
3285 | ||
3286 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
3287 | goto out_error; | |
3288 | XFS_STATS_INC(mp, xs_log_force_sleep); | |
3289 | xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); | |
3290 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
3291 | return -EIO; | |
1da177e4 | 3292 | return 0; |
e6b96570 CH |
3293 | |
3294 | out_unlock: | |
3295 | spin_unlock(&log->l_icloglock); | |
3296 | return 0; | |
3297 | out_error: | |
3298 | spin_unlock(&log->l_icloglock); | |
3299 | return -EIO; | |
a14a348b | 3300 | } |
1da177e4 | 3301 | |
3e4da466 CH |
3302 | static int |
3303 | __xfs_log_force_lsn( | |
a14a348b CH |
3304 | struct xfs_mount *mp, |
3305 | xfs_lsn_t lsn, | |
3306 | uint flags, | |
3e4da466 CH |
3307 | int *log_flushed, |
3308 | bool already_slept) | |
1da177e4 | 3309 | { |
ad223e60 | 3310 | struct xlog *log = mp->m_log; |
a14a348b | 3311 | struct xlog_in_core *iclog; |
71e330b5 | 3312 | |
a14a348b CH |
3313 | spin_lock(&log->l_icloglock); |
3314 | iclog = log->l_iclog; | |
93806299 CH |
3315 | if (iclog->ic_state & XLOG_STATE_IOERROR) |
3316 | goto out_error; | |
1da177e4 | 3317 | |
93806299 CH |
3318 | while (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) { |
3319 | iclog = iclog->ic_next; | |
3320 | if (iclog == log->l_iclog) | |
3321 | goto out_unlock; | |
3322 | } | |
a14a348b | 3323 | |
93806299 CH |
3324 | if (iclog->ic_state == XLOG_STATE_DIRTY) |
3325 | goto out_unlock; | |
a14a348b | 3326 | |
93806299 CH |
3327 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { |
3328 | /* | |
3329 | * We sleep here if we haven't already slept (e.g. this is the | |
3330 | * first time we've looked at the correct iclog buf) and the | |
3331 | * buffer before us is going to be sync'ed. The reason for this | |
3332 | * is that if we are doing sync transactions here, by waiting | |
3333 | * for the previous I/O to complete, we can allow a few more | |
3334 | * transactions into this iclog before we close it down. | |
3335 | * | |
3336 | * Otherwise, we mark the buffer WANT_SYNC, and bump up the | |
3337 | * refcnt so we can release the log (which drops the ref count). | |
3338 | * The state switch keeps new transaction commits from using | |
3339 | * this buffer. When the current commits finish writing into | |
3340 | * the buffer, the refcount will drop to zero and the buffer | |
3341 | * will go out then. | |
3342 | */ | |
3343 | if (!already_slept && | |
3344 | (iclog->ic_prev->ic_state & | |
3345 | (XLOG_STATE_WANT_SYNC | XLOG_STATE_SYNCING))) { | |
3346 | ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); | |
a14a348b | 3347 | |
93806299 | 3348 | XFS_STATS_INC(mp, xs_log_force_sleep); |
a14a348b | 3349 | |
93806299 CH |
3350 | xlog_wait(&iclog->ic_prev->ic_write_wait, |
3351 | &log->l_icloglock); | |
3e4da466 | 3352 | return -EAGAIN; |
1da177e4 | 3353 | } |
93806299 CH |
3354 | atomic_inc(&iclog->ic_refcnt); |
3355 | xlog_state_switch_iclogs(log, iclog, 0); | |
3356 | spin_unlock(&log->l_icloglock); | |
3357 | if (xlog_state_release_iclog(log, iclog)) | |
3358 | return -EIO; | |
3359 | if (log_flushed) | |
3360 | *log_flushed = 1; | |
3361 | spin_lock(&log->l_icloglock); | |
3362 | } | |
1da177e4 | 3363 | |
93806299 CH |
3364 | if (!(flags & XFS_LOG_SYNC) || |
3365 | (iclog->ic_state & (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) | |
3366 | goto out_unlock; | |
1da177e4 | 3367 | |
93806299 CH |
3368 | if (iclog->ic_state & XLOG_STATE_IOERROR) |
3369 | goto out_error; | |
3370 | ||
3371 | XFS_STATS_INC(mp, xs_log_force_sleep); | |
3372 | xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); | |
3373 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
3374 | return -EIO; | |
3375 | return 0; | |
1da177e4 | 3376 | |
93806299 | 3377 | out_unlock: |
a14a348b CH |
3378 | spin_unlock(&log->l_icloglock); |
3379 | return 0; | |
93806299 CH |
3380 | out_error: |
3381 | spin_unlock(&log->l_icloglock); | |
3382 | return -EIO; | |
a14a348b CH |
3383 | } |
3384 | ||
3e4da466 CH |
3385 | /* |
3386 | * Force the in-core log to disk for a specific LSN. | |
3387 | * | |
3388 | * Find in-core log with lsn. | |
3389 | * If it is in the DIRTY state, just return. | |
3390 | * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC | |
3391 | * state and go to sleep or return. | |
3392 | * If it is in any other state, go to sleep or return. | |
3393 | * | |
3394 | * Synchronous forces are implemented with a wait queue. All callers trying | |
3395 | * to force a given lsn to disk must wait on the queue attached to the | |
3396 | * specific in-core log. When given in-core log finally completes its write | |
3397 | * to disk, that thread will wake up all threads waiting on the queue. | |
3398 | */ | |
3399 | int | |
3400 | xfs_log_force_lsn( | |
3401 | struct xfs_mount *mp, | |
3402 | xfs_lsn_t lsn, | |
3403 | uint flags, | |
3404 | int *log_flushed) | |
3405 | { | |
3406 | int ret; | |
3407 | ASSERT(lsn != 0); | |
3408 | ||
3409 | XFS_STATS_INC(mp, xs_log_force); | |
3410 | trace_xfs_log_force(mp, lsn, _RET_IP_); | |
3411 | ||
3412 | lsn = xlog_cil_force_lsn(mp->m_log, lsn); | |
3413 | if (lsn == NULLCOMMITLSN) | |
3414 | return 0; | |
3415 | ||
3416 | ret = __xfs_log_force_lsn(mp, lsn, flags, log_flushed, false); | |
3417 | if (ret == -EAGAIN) | |
3418 | ret = __xfs_log_force_lsn(mp, lsn, flags, log_flushed, true); | |
3419 | return ret; | |
3420 | } | |
3421 | ||
1da177e4 LT |
3422 | /* |
3423 | * Called when we want to mark the current iclog as being ready to sync to | |
3424 | * disk. | |
3425 | */ | |
a8272ce0 | 3426 | STATIC void |
9a8d2fdb MT |
3427 | xlog_state_want_sync( |
3428 | struct xlog *log, | |
3429 | struct xlog_in_core *iclog) | |
1da177e4 | 3430 | { |
a8914f3a | 3431 | assert_spin_locked(&log->l_icloglock); |
1da177e4 LT |
3432 | |
3433 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3434 | xlog_state_switch_iclogs(log, iclog, 0); | |
3435 | } else { | |
3436 | ASSERT(iclog->ic_state & | |
3437 | (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR)); | |
3438 | } | |
39e2defe | 3439 | } |
1da177e4 LT |
3440 | |
3441 | ||
3442 | /***************************************************************************** | |
3443 | * | |
3444 | * TICKET functions | |
3445 | * | |
3446 | ***************************************************************************** | |
3447 | */ | |
3448 | ||
3449 | /* | |
9da096fd | 3450 | * Free a used ticket when its refcount falls to zero. |
1da177e4 | 3451 | */ |
cc09c0dc DC |
3452 | void |
3453 | xfs_log_ticket_put( | |
3454 | xlog_ticket_t *ticket) | |
1da177e4 | 3455 | { |
cc09c0dc | 3456 | ASSERT(atomic_read(&ticket->t_ref) > 0); |
eb40a875 | 3457 | if (atomic_dec_and_test(&ticket->t_ref)) |
cc09c0dc | 3458 | kmem_zone_free(xfs_log_ticket_zone, ticket); |
cc09c0dc | 3459 | } |
1da177e4 | 3460 | |
cc09c0dc DC |
3461 | xlog_ticket_t * |
3462 | xfs_log_ticket_get( | |
3463 | xlog_ticket_t *ticket) | |
3464 | { | |
3465 | ASSERT(atomic_read(&ticket->t_ref) > 0); | |
3466 | atomic_inc(&ticket->t_ref); | |
3467 | return ticket; | |
3468 | } | |
1da177e4 LT |
3469 | |
3470 | /* | |
e773fc93 JL |
3471 | * Figure out the total log space unit (in bytes) that would be |
3472 | * required for a log ticket. | |
1da177e4 | 3473 | */ |
e773fc93 JL |
3474 | int |
3475 | xfs_log_calc_unit_res( | |
3476 | struct xfs_mount *mp, | |
3477 | int unit_bytes) | |
1da177e4 | 3478 | { |
e773fc93 JL |
3479 | struct xlog *log = mp->m_log; |
3480 | int iclog_space; | |
3481 | uint num_headers; | |
1da177e4 LT |
3482 | |
3483 | /* | |
3484 | * Permanent reservations have up to 'cnt'-1 active log operations | |
3485 | * in the log. A unit in this case is the amount of space for one | |
3486 | * of these log operations. Normal reservations have a cnt of 1 | |
3487 | * and their unit amount is the total amount of space required. | |
3488 | * | |
3489 | * The following lines of code account for non-transaction data | |
32fb9b57 TS |
3490 | * which occupy space in the on-disk log. |
3491 | * | |
3492 | * Normal form of a transaction is: | |
3493 | * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> | |
3494 | * and then there are LR hdrs, split-recs and roundoff at end of syncs. | |
3495 | * | |
3496 | * We need to account for all the leadup data and trailer data | |
3497 | * around the transaction data. | |
3498 | * And then we need to account for the worst case in terms of using | |
3499 | * more space. | |
3500 | * The worst case will happen if: | |
3501 | * - the placement of the transaction happens to be such that the | |
3502 | * roundoff is at its maximum | |
3503 | * - the transaction data is synced before the commit record is synced | |
3504 | * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> | |
3505 | * Therefore the commit record is in its own Log Record. | |
3506 | * This can happen as the commit record is called with its | |
3507 | * own region to xlog_write(). | |
3508 | * This then means that in the worst case, roundoff can happen for | |
3509 | * the commit-rec as well. | |
3510 | * The commit-rec is smaller than padding in this scenario and so it is | |
3511 | * not added separately. | |
1da177e4 LT |
3512 | */ |
3513 | ||
32fb9b57 TS |
3514 | /* for trans header */ |
3515 | unit_bytes += sizeof(xlog_op_header_t); | |
3516 | unit_bytes += sizeof(xfs_trans_header_t); | |
3517 | ||
1da177e4 | 3518 | /* for start-rec */ |
32fb9b57 TS |
3519 | unit_bytes += sizeof(xlog_op_header_t); |
3520 | ||
9b9fc2b7 DC |
3521 | /* |
3522 | * for LR headers - the space for data in an iclog is the size minus | |
3523 | * the space used for the headers. If we use the iclog size, then we | |
3524 | * undercalculate the number of headers required. | |
3525 | * | |
3526 | * Furthermore - the addition of op headers for split-recs might | |
3527 | * increase the space required enough to require more log and op | |
3528 | * headers, so take that into account too. | |
3529 | * | |
3530 | * IMPORTANT: This reservation makes the assumption that if this | |
3531 | * transaction is the first in an iclog and hence has the LR headers | |
3532 | * accounted to it, then the remaining space in the iclog is | |
3533 | * exclusively for this transaction. i.e. if the transaction is larger | |
3534 | * than the iclog, it will be the only thing in that iclog. | |
3535 | * Fundamentally, this means we must pass the entire log vector to | |
3536 | * xlog_write to guarantee this. | |
3537 | */ | |
3538 | iclog_space = log->l_iclog_size - log->l_iclog_hsize; | |
3539 | num_headers = howmany(unit_bytes, iclog_space); | |
3540 | ||
3541 | /* for split-recs - ophdrs added when data split over LRs */ | |
3542 | unit_bytes += sizeof(xlog_op_header_t) * num_headers; | |
3543 | ||
3544 | /* add extra header reservations if we overrun */ | |
3545 | while (!num_headers || | |
3546 | howmany(unit_bytes, iclog_space) > num_headers) { | |
3547 | unit_bytes += sizeof(xlog_op_header_t); | |
3548 | num_headers++; | |
3549 | } | |
32fb9b57 | 3550 | unit_bytes += log->l_iclog_hsize * num_headers; |
1da177e4 | 3551 | |
32fb9b57 TS |
3552 | /* for commit-rec LR header - note: padding will subsume the ophdr */ |
3553 | unit_bytes += log->l_iclog_hsize; | |
3554 | ||
32fb9b57 | 3555 | /* for roundoff padding for transaction data and one for commit record */ |
e773fc93 | 3556 | if (xfs_sb_version_haslogv2(&mp->m_sb) && mp->m_sb.sb_logsunit > 1) { |
1da177e4 | 3557 | /* log su roundoff */ |
e773fc93 | 3558 | unit_bytes += 2 * mp->m_sb.sb_logsunit; |
1da177e4 LT |
3559 | } else { |
3560 | /* BB roundoff */ | |
e773fc93 | 3561 | unit_bytes += 2 * BBSIZE; |
1da177e4 LT |
3562 | } |
3563 | ||
e773fc93 JL |
3564 | return unit_bytes; |
3565 | } | |
3566 | ||
3567 | /* | |
3568 | * Allocate and initialise a new log ticket. | |
3569 | */ | |
3570 | struct xlog_ticket * | |
3571 | xlog_ticket_alloc( | |
3572 | struct xlog *log, | |
3573 | int unit_bytes, | |
3574 | int cnt, | |
3575 | char client, | |
3576 | bool permanent, | |
3577 | xfs_km_flags_t alloc_flags) | |
3578 | { | |
3579 | struct xlog_ticket *tic; | |
3580 | int unit_res; | |
3581 | ||
3582 | tic = kmem_zone_zalloc(xfs_log_ticket_zone, alloc_flags); | |
3583 | if (!tic) | |
3584 | return NULL; | |
3585 | ||
3586 | unit_res = xfs_log_calc_unit_res(log->l_mp, unit_bytes); | |
3587 | ||
cc09c0dc | 3588 | atomic_set(&tic->t_ref, 1); |
14a7235f | 3589 | tic->t_task = current; |
10547941 | 3590 | INIT_LIST_HEAD(&tic->t_queue); |
e773fc93 JL |
3591 | tic->t_unit_res = unit_res; |
3592 | tic->t_curr_res = unit_res; | |
1da177e4 LT |
3593 | tic->t_cnt = cnt; |
3594 | tic->t_ocnt = cnt; | |
ecb3403d | 3595 | tic->t_tid = prandom_u32(); |
1da177e4 LT |
3596 | tic->t_clientid = client; |
3597 | tic->t_flags = XLOG_TIC_INITED; | |
9006fb91 | 3598 | if (permanent) |
1da177e4 | 3599 | tic->t_flags |= XLOG_TIC_PERM_RESERV; |
1da177e4 | 3600 | |
0adba536 | 3601 | xlog_tic_reset_res(tic); |
7e9c6396 | 3602 | |
1da177e4 | 3603 | return tic; |
cc09c0dc | 3604 | } |
1da177e4 LT |
3605 | |
3606 | ||
3607 | /****************************************************************************** | |
3608 | * | |
3609 | * Log debug routines | |
3610 | * | |
3611 | ****************************************************************************** | |
3612 | */ | |
cfcbbbd0 | 3613 | #if defined(DEBUG) |
1da177e4 LT |
3614 | /* |
3615 | * Make sure that the destination ptr is within the valid data region of | |
3616 | * one of the iclogs. This uses backup pointers stored in a different | |
3617 | * part of the log in case we trash the log structure. | |
3618 | */ | |
181fdfe6 | 3619 | STATIC void |
e6b1f273 | 3620 | xlog_verify_dest_ptr( |
ad223e60 | 3621 | struct xlog *log, |
5809d5e0 | 3622 | void *ptr) |
1da177e4 LT |
3623 | { |
3624 | int i; | |
3625 | int good_ptr = 0; | |
3626 | ||
e6b1f273 CH |
3627 | for (i = 0; i < log->l_iclog_bufs; i++) { |
3628 | if (ptr >= log->l_iclog_bak[i] && | |
3629 | ptr <= log->l_iclog_bak[i] + log->l_iclog_size) | |
1da177e4 LT |
3630 | good_ptr++; |
3631 | } | |
e6b1f273 CH |
3632 | |
3633 | if (!good_ptr) | |
a0fa2b67 | 3634 | xfs_emerg(log->l_mp, "%s: invalid ptr", __func__); |
e6b1f273 | 3635 | } |
1da177e4 | 3636 | |
da8a1a4a DC |
3637 | /* |
3638 | * Check to make sure the grant write head didn't just over lap the tail. If | |
3639 | * the cycles are the same, we can't be overlapping. Otherwise, make sure that | |
3640 | * the cycles differ by exactly one and check the byte count. | |
3641 | * | |
3642 | * This check is run unlocked, so can give false positives. Rather than assert | |
3643 | * on failures, use a warn-once flag and a panic tag to allow the admin to | |
3644 | * determine if they want to panic the machine when such an error occurs. For | |
3645 | * debug kernels this will have the same effect as using an assert but, unlinke | |
3646 | * an assert, it can be turned off at runtime. | |
3647 | */ | |
3f336c6f DC |
3648 | STATIC void |
3649 | xlog_verify_grant_tail( | |
ad223e60 | 3650 | struct xlog *log) |
3f336c6f | 3651 | { |
1c3cb9ec | 3652 | int tail_cycle, tail_blocks; |
a69ed03c | 3653 | int cycle, space; |
3f336c6f | 3654 | |
28496968 | 3655 | xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &space); |
1c3cb9ec DC |
3656 | xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_blocks); |
3657 | if (tail_cycle != cycle) { | |
da8a1a4a DC |
3658 | if (cycle - 1 != tail_cycle && |
3659 | !(log->l_flags & XLOG_TAIL_WARN)) { | |
3660 | xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, | |
3661 | "%s: cycle - 1 != tail_cycle", __func__); | |
3662 | log->l_flags |= XLOG_TAIL_WARN; | |
3663 | } | |
3664 | ||
3665 | if (space > BBTOB(tail_blocks) && | |
3666 | !(log->l_flags & XLOG_TAIL_WARN)) { | |
3667 | xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, | |
3668 | "%s: space > BBTOB(tail_blocks)", __func__); | |
3669 | log->l_flags |= XLOG_TAIL_WARN; | |
3670 | } | |
3f336c6f DC |
3671 | } |
3672 | } | |
3673 | ||
1da177e4 LT |
3674 | /* check if it will fit */ |
3675 | STATIC void | |
9a8d2fdb MT |
3676 | xlog_verify_tail_lsn( |
3677 | struct xlog *log, | |
3678 | struct xlog_in_core *iclog, | |
3679 | xfs_lsn_t tail_lsn) | |
1da177e4 LT |
3680 | { |
3681 | int blocks; | |
3682 | ||
3683 | if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { | |
3684 | blocks = | |
3685 | log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); | |
3686 | if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) | |
a0fa2b67 | 3687 | xfs_emerg(log->l_mp, "%s: ran out of log space", __func__); |
1da177e4 LT |
3688 | } else { |
3689 | ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); | |
3690 | ||
3691 | if (BLOCK_LSN(tail_lsn) == log->l_prev_block) | |
a0fa2b67 | 3692 | xfs_emerg(log->l_mp, "%s: tail wrapped", __func__); |
1da177e4 LT |
3693 | |
3694 | blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; | |
3695 | if (blocks < BTOBB(iclog->ic_offset) + 1) | |
a0fa2b67 | 3696 | xfs_emerg(log->l_mp, "%s: ran out of log space", __func__); |
1da177e4 LT |
3697 | } |
3698 | } /* xlog_verify_tail_lsn */ | |
3699 | ||
3700 | /* | |
3701 | * Perform a number of checks on the iclog before writing to disk. | |
3702 | * | |
3703 | * 1. Make sure the iclogs are still circular | |
3704 | * 2. Make sure we have a good magic number | |
3705 | * 3. Make sure we don't have magic numbers in the data | |
3706 | * 4. Check fields of each log operation header for: | |
3707 | * A. Valid client identifier | |
3708 | * B. tid ptr value falls in valid ptr space (user space code) | |
3709 | * C. Length in log record header is correct according to the | |
3710 | * individual operation headers within record. | |
3711 | * 5. When a bwrite will occur within 5 blocks of the front of the physical | |
3712 | * log, check the preceding blocks of the physical log to make sure all | |
3713 | * the cycle numbers agree with the current cycle number. | |
3714 | */ | |
3715 | STATIC void | |
9a8d2fdb MT |
3716 | xlog_verify_iclog( |
3717 | struct xlog *log, | |
3718 | struct xlog_in_core *iclog, | |
abca1f33 | 3719 | int count) |
1da177e4 LT |
3720 | { |
3721 | xlog_op_header_t *ophead; | |
3722 | xlog_in_core_t *icptr; | |
3723 | xlog_in_core_2_t *xhdr; | |
5809d5e0 | 3724 | void *base_ptr, *ptr, *p; |
db9d67d6 | 3725 | ptrdiff_t field_offset; |
c8ce540d | 3726 | uint8_t clientid; |
1da177e4 LT |
3727 | int len, i, j, k, op_len; |
3728 | int idx; | |
1da177e4 LT |
3729 | |
3730 | /* check validity of iclog pointers */ | |
b22cd72c | 3731 | spin_lock(&log->l_icloglock); |
1da177e4 | 3732 | icptr = log->l_iclog; |
643f7c4e GB |
3733 | for (i = 0; i < log->l_iclog_bufs; i++, icptr = icptr->ic_next) |
3734 | ASSERT(icptr); | |
3735 | ||
1da177e4 | 3736 | if (icptr != log->l_iclog) |
a0fa2b67 | 3737 | xfs_emerg(log->l_mp, "%s: corrupt iclog ring", __func__); |
b22cd72c | 3738 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3739 | |
3740 | /* check log magic numbers */ | |
69ef921b | 3741 | if (iclog->ic_header.h_magicno != cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) |
a0fa2b67 | 3742 | xfs_emerg(log->l_mp, "%s: invalid magic num", __func__); |
1da177e4 | 3743 | |
5809d5e0 CH |
3744 | base_ptr = ptr = &iclog->ic_header; |
3745 | p = &iclog->ic_header; | |
3746 | for (ptr += BBSIZE; ptr < base_ptr + count; ptr += BBSIZE) { | |
69ef921b | 3747 | if (*(__be32 *)ptr == cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) |
a0fa2b67 DC |
3748 | xfs_emerg(log->l_mp, "%s: unexpected magic num", |
3749 | __func__); | |
1da177e4 LT |
3750 | } |
3751 | ||
3752 | /* check fields */ | |
b53e675d | 3753 | len = be32_to_cpu(iclog->ic_header.h_num_logops); |
5809d5e0 CH |
3754 | base_ptr = ptr = iclog->ic_datap; |
3755 | ophead = ptr; | |
b28708d6 | 3756 | xhdr = iclog->ic_data; |
1da177e4 | 3757 | for (i = 0; i < len; i++) { |
5809d5e0 | 3758 | ophead = ptr; |
1da177e4 LT |
3759 | |
3760 | /* clientid is only 1 byte */ | |
5809d5e0 CH |
3761 | p = &ophead->oh_clientid; |
3762 | field_offset = p - base_ptr; | |
abca1f33 | 3763 | if (field_offset & 0x1ff) { |
1da177e4 LT |
3764 | clientid = ophead->oh_clientid; |
3765 | } else { | |
b2a922cd | 3766 | idx = BTOBBT((char *)&ophead->oh_clientid - iclog->ic_datap); |
1da177e4 LT |
3767 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { |
3768 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3769 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
03bea6fe CH |
3770 | clientid = xlog_get_client_id( |
3771 | xhdr[j].hic_xheader.xh_cycle_data[k]); | |
1da177e4 | 3772 | } else { |
03bea6fe CH |
3773 | clientid = xlog_get_client_id( |
3774 | iclog->ic_header.h_cycle_data[idx]); | |
1da177e4 LT |
3775 | } |
3776 | } | |
3777 | if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) | |
a0fa2b67 | 3778 | xfs_warn(log->l_mp, |
c9690043 | 3779 | "%s: invalid clientid %d op "PTR_FMT" offset 0x%lx", |
a0fa2b67 DC |
3780 | __func__, clientid, ophead, |
3781 | (unsigned long)field_offset); | |
1da177e4 LT |
3782 | |
3783 | /* check length */ | |
5809d5e0 CH |
3784 | p = &ophead->oh_len; |
3785 | field_offset = p - base_ptr; | |
abca1f33 | 3786 | if (field_offset & 0x1ff) { |
67fcb7bf | 3787 | op_len = be32_to_cpu(ophead->oh_len); |
1da177e4 | 3788 | } else { |
db9d67d6 CH |
3789 | idx = BTOBBT((uintptr_t)&ophead->oh_len - |
3790 | (uintptr_t)iclog->ic_datap); | |
1da177e4 LT |
3791 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { |
3792 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3793 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
b53e675d | 3794 | op_len = be32_to_cpu(xhdr[j].hic_xheader.xh_cycle_data[k]); |
1da177e4 | 3795 | } else { |
b53e675d | 3796 | op_len = be32_to_cpu(iclog->ic_header.h_cycle_data[idx]); |
1da177e4 LT |
3797 | } |
3798 | } | |
3799 | ptr += sizeof(xlog_op_header_t) + op_len; | |
3800 | } | |
3801 | } /* xlog_verify_iclog */ | |
cfcbbbd0 | 3802 | #endif |
1da177e4 LT |
3803 | |
3804 | /* | |
b22cd72c | 3805 | * Mark all iclogs IOERROR. l_icloglock is held by the caller. |
1da177e4 LT |
3806 | */ |
3807 | STATIC int | |
3808 | xlog_state_ioerror( | |
9a8d2fdb | 3809 | struct xlog *log) |
1da177e4 LT |
3810 | { |
3811 | xlog_in_core_t *iclog, *ic; | |
3812 | ||
3813 | iclog = log->l_iclog; | |
3814 | if (! (iclog->ic_state & XLOG_STATE_IOERROR)) { | |
3815 | /* | |
3816 | * Mark all the incore logs IOERROR. | |
3817 | * From now on, no log flushes will result. | |
3818 | */ | |
3819 | ic = iclog; | |
3820 | do { | |
3821 | ic->ic_state = XLOG_STATE_IOERROR; | |
3822 | ic = ic->ic_next; | |
3823 | } while (ic != iclog); | |
014c2544 | 3824 | return 0; |
1da177e4 LT |
3825 | } |
3826 | /* | |
3827 | * Return non-zero, if state transition has already happened. | |
3828 | */ | |
014c2544 | 3829 | return 1; |
1da177e4 LT |
3830 | } |
3831 | ||
3832 | /* | |
3833 | * This is called from xfs_force_shutdown, when we're forcibly | |
3834 | * shutting down the filesystem, typically because of an IO error. | |
3835 | * Our main objectives here are to make sure that: | |
a870fe6d DC |
3836 | * a. if !logerror, flush the logs to disk. Anything modified |
3837 | * after this is ignored. | |
3838 | * b. the filesystem gets marked 'SHUTDOWN' for all interested | |
1da177e4 | 3839 | * parties to find out, 'atomically'. |
a870fe6d | 3840 | * c. those who're sleeping on log reservations, pinned objects and |
1da177e4 | 3841 | * other resources get woken up, and be told the bad news. |
a870fe6d | 3842 | * d. nothing new gets queued up after (b) and (c) are done. |
9da1ab18 | 3843 | * |
a870fe6d DC |
3844 | * Note: for the !logerror case we need to flush the regions held in memory out |
3845 | * to disk first. This needs to be done before the log is marked as shutdown, | |
3846 | * otherwise the iclog writes will fail. | |
1da177e4 LT |
3847 | */ |
3848 | int | |
3849 | xfs_log_force_umount( | |
3850 | struct xfs_mount *mp, | |
3851 | int logerror) | |
3852 | { | |
9a8d2fdb | 3853 | struct xlog *log; |
1da177e4 | 3854 | int retval; |
1da177e4 LT |
3855 | |
3856 | log = mp->m_log; | |
3857 | ||
3858 | /* | |
3859 | * If this happens during log recovery, don't worry about | |
3860 | * locking; the log isn't open for business yet. | |
3861 | */ | |
3862 | if (!log || | |
3863 | log->l_flags & XLOG_ACTIVE_RECOVERY) { | |
3864 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; | |
bac8dca9 | 3865 | if (mp->m_sb_bp) |
b0388bf1 | 3866 | mp->m_sb_bp->b_flags |= XBF_DONE; |
014c2544 | 3867 | return 0; |
1da177e4 LT |
3868 | } |
3869 | ||
3870 | /* | |
3871 | * Somebody could've already done the hard work for us. | |
3872 | * No need to get locks for this. | |
3873 | */ | |
3874 | if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { | |
3875 | ASSERT(XLOG_FORCED_SHUTDOWN(log)); | |
014c2544 | 3876 | return 1; |
1da177e4 | 3877 | } |
9da1ab18 DC |
3878 | |
3879 | /* | |
a870fe6d DC |
3880 | * Flush all the completed transactions to disk before marking the log |
3881 | * being shut down. We need to do it in this order to ensure that | |
3882 | * completed operations are safely on disk before we shut down, and that | |
3883 | * we don't have to issue any buffer IO after the shutdown flags are set | |
3884 | * to guarantee this. | |
9da1ab18 | 3885 | */ |
93b8a585 | 3886 | if (!logerror) |
60e5bb78 | 3887 | xfs_log_force(mp, XFS_LOG_SYNC); |
9da1ab18 | 3888 | |
1da177e4 | 3889 | /* |
3f16b985 DC |
3890 | * mark the filesystem and the as in a shutdown state and wake |
3891 | * everybody up to tell them the bad news. | |
1da177e4 | 3892 | */ |
b22cd72c | 3893 | spin_lock(&log->l_icloglock); |
1da177e4 | 3894 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; |
bac8dca9 | 3895 | if (mp->m_sb_bp) |
b0388bf1 | 3896 | mp->m_sb_bp->b_flags |= XBF_DONE; |
bac8dca9 | 3897 | |
1da177e4 | 3898 | /* |
a870fe6d DC |
3899 | * Mark the log and the iclogs with IO error flags to prevent any |
3900 | * further log IO from being issued or completed. | |
1da177e4 LT |
3901 | */ |
3902 | log->l_flags |= XLOG_IO_ERROR; | |
a870fe6d | 3903 | retval = xlog_state_ioerror(log); |
b22cd72c | 3904 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3905 | |
3906 | /* | |
10547941 DC |
3907 | * We don't want anybody waiting for log reservations after this. That |
3908 | * means we have to wake up everybody queued up on reserveq as well as | |
3909 | * writeq. In addition, we make sure in xlog_{re}grant_log_space that | |
3910 | * we don't enqueue anything once the SHUTDOWN flag is set, and this | |
3f16b985 | 3911 | * action is protected by the grant locks. |
1da177e4 | 3912 | */ |
a79bf2d7 CH |
3913 | xlog_grant_head_wake_all(&log->l_reserve_head); |
3914 | xlog_grant_head_wake_all(&log->l_write_head); | |
1da177e4 | 3915 | |
1da177e4 | 3916 | /* |
ac983517 DC |
3917 | * Wake up everybody waiting on xfs_log_force. Wake the CIL push first |
3918 | * as if the log writes were completed. The abort handling in the log | |
3919 | * item committed callback functions will do this again under lock to | |
3920 | * avoid races. | |
1da177e4 | 3921 | */ |
ac983517 | 3922 | wake_up_all(&log->l_cilp->xc_commit_wait); |
d15cbf2f | 3923 | xlog_state_do_callback(log, true, NULL); |
1da177e4 LT |
3924 | |
3925 | #ifdef XFSERRORDEBUG | |
3926 | { | |
3927 | xlog_in_core_t *iclog; | |
3928 | ||
b22cd72c | 3929 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3930 | iclog = log->l_iclog; |
3931 | do { | |
3932 | ASSERT(iclog->ic_callback == 0); | |
3933 | iclog = iclog->ic_next; | |
3934 | } while (iclog != log->l_iclog); | |
b22cd72c | 3935 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3936 | } |
3937 | #endif | |
3938 | /* return non-zero if log IOERROR transition had already happened */ | |
014c2544 | 3939 | return retval; |
1da177e4 LT |
3940 | } |
3941 | ||
ba0f32d4 | 3942 | STATIC int |
9a8d2fdb MT |
3943 | xlog_iclogs_empty( |
3944 | struct xlog *log) | |
1da177e4 LT |
3945 | { |
3946 | xlog_in_core_t *iclog; | |
3947 | ||
3948 | iclog = log->l_iclog; | |
3949 | do { | |
3950 | /* endianness does not matter here, zero is zero in | |
3951 | * any language. | |
3952 | */ | |
3953 | if (iclog->ic_header.h_num_logops) | |
014c2544 | 3954 | return 0; |
1da177e4 LT |
3955 | iclog = iclog->ic_next; |
3956 | } while (iclog != log->l_iclog); | |
014c2544 | 3957 | return 1; |
1da177e4 | 3958 | } |
f661f1e0 | 3959 | |
a45086e2 BF |
3960 | /* |
3961 | * Verify that an LSN stamped into a piece of metadata is valid. This is | |
3962 | * intended for use in read verifiers on v5 superblocks. | |
3963 | */ | |
3964 | bool | |
3965 | xfs_log_check_lsn( | |
3966 | struct xfs_mount *mp, | |
3967 | xfs_lsn_t lsn) | |
3968 | { | |
3969 | struct xlog *log = mp->m_log; | |
3970 | bool valid; | |
3971 | ||
3972 | /* | |
3973 | * norecovery mode skips mount-time log processing and unconditionally | |
3974 | * resets the in-core LSN. We can't validate in this mode, but | |
3975 | * modifications are not allowed anyways so just return true. | |
3976 | */ | |
3977 | if (mp->m_flags & XFS_MOUNT_NORECOVERY) | |
3978 | return true; | |
3979 | ||
3980 | /* | |
3981 | * Some metadata LSNs are initialized to NULL (e.g., the agfl). This is | |
3982 | * handled by recovery and thus safe to ignore here. | |
3983 | */ | |
3984 | if (lsn == NULLCOMMITLSN) | |
3985 | return true; | |
3986 | ||
3987 | valid = xlog_valid_lsn(mp->m_log, lsn); | |
3988 | ||
3989 | /* warn the user about what's gone wrong before verifier failure */ | |
3990 | if (!valid) { | |
3991 | spin_lock(&log->l_icloglock); | |
3992 | xfs_warn(mp, | |
3993 | "Corruption warning: Metadata has LSN (%d:%d) ahead of current LSN (%d:%d). " | |
3994 | "Please unmount and run xfs_repair (>= v4.3) to resolve.", | |
3995 | CYCLE_LSN(lsn), BLOCK_LSN(lsn), | |
3996 | log->l_curr_cycle, log->l_curr_block); | |
3997 | spin_unlock(&log->l_icloglock); | |
3998 | } | |
3999 | ||
4000 | return valid; | |
4001 | } | |
0c60d3aa DW |
4002 | |
4003 | bool | |
4004 | xfs_log_in_recovery( | |
4005 | struct xfs_mount *mp) | |
4006 | { | |
4007 | struct xlog *log = mp->m_log; | |
4008 | ||
4009 | return log->l_flags & XLOG_ACTIVE_RECOVERY; | |
4010 | } |