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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 | 24 | #include "xfs_trans.h" |
a844f451 NS |
25 | #include "xfs_sb.h" |
26 | #include "xfs_ag.h" | |
1da177e4 LT |
27 | #include "xfs_mount.h" |
28 | #include "xfs_error.h" | |
29 | #include "xfs_log_priv.h" | |
30 | #include "xfs_buf_item.h" | |
a844f451 | 31 | #include "xfs_bmap_btree.h" |
1da177e4 | 32 | #include "xfs_alloc_btree.h" |
a844f451 | 33 | #include "xfs_ialloc_btree.h" |
1da177e4 | 34 | #include "xfs_log_recover.h" |
1da177e4 | 35 | #include "xfs_trans_priv.h" |
a844f451 NS |
36 | #include "xfs_dinode.h" |
37 | #include "xfs_inode.h" | |
38 | #include "xfs_rw.h" | |
0b1b213f | 39 | #include "xfs_trace.h" |
1da177e4 | 40 | |
eb01c9cd | 41 | kmem_zone_t *xfs_log_ticket_zone; |
1da177e4 | 42 | |
1da177e4 | 43 | /* Local miscellaneous function prototypes */ |
55b66332 | 44 | STATIC int xlog_commit_record(struct log *log, struct xlog_ticket *ticket, |
1da177e4 LT |
45 | xlog_in_core_t **, xfs_lsn_t *); |
46 | STATIC xlog_t * xlog_alloc_log(xfs_mount_t *mp, | |
47 | xfs_buftarg_t *log_target, | |
48 | xfs_daddr_t blk_offset, | |
49 | int num_bblks); | |
c8a09ff8 | 50 | STATIC int xlog_space_left(struct log *log, atomic64_t *head); |
1da177e4 | 51 | STATIC int xlog_sync(xlog_t *log, xlog_in_core_t *iclog); |
c41564b5 | 52 | STATIC void xlog_dealloc_log(xlog_t *log); |
1da177e4 LT |
53 | |
54 | /* local state machine functions */ | |
55 | STATIC void xlog_state_done_syncing(xlog_in_core_t *iclog, int); | |
56 | STATIC void xlog_state_do_callback(xlog_t *log,int aborted, xlog_in_core_t *iclog); | |
57 | STATIC int xlog_state_get_iclog_space(xlog_t *log, | |
58 | int len, | |
59 | xlog_in_core_t **iclog, | |
60 | xlog_ticket_t *ticket, | |
61 | int *continued_write, | |
62 | int *logoffsetp); | |
1da177e4 LT |
63 | STATIC int xlog_state_release_iclog(xlog_t *log, |
64 | xlog_in_core_t *iclog); | |
65 | STATIC void xlog_state_switch_iclogs(xlog_t *log, | |
66 | xlog_in_core_t *iclog, | |
67 | int eventual_size); | |
1da177e4 LT |
68 | STATIC void xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog); |
69 | ||
2ced19cb | 70 | STATIC void xlog_grant_push_ail(struct log *log, |
1da177e4 LT |
71 | int need_bytes); |
72 | STATIC void xlog_regrant_reserve_log_space(xlog_t *log, | |
73 | xlog_ticket_t *ticket); | |
1da177e4 LT |
74 | STATIC void xlog_ungrant_log_space(xlog_t *log, |
75 | xlog_ticket_t *ticket); | |
76 | ||
cfcbbbd0 | 77 | #if defined(DEBUG) |
e6b1f273 | 78 | STATIC void xlog_verify_dest_ptr(xlog_t *log, char *ptr); |
3f336c6f | 79 | STATIC void xlog_verify_grant_tail(struct log *log); |
1da177e4 LT |
80 | STATIC void xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog, |
81 | int count, boolean_t syncing); | |
82 | STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog, | |
83 | xfs_lsn_t tail_lsn); | |
84 | #else | |
85 | #define xlog_verify_dest_ptr(a,b) | |
3f336c6f | 86 | #define xlog_verify_grant_tail(a) |
1da177e4 LT |
87 | #define xlog_verify_iclog(a,b,c,d) |
88 | #define xlog_verify_tail_lsn(a,b,c) | |
89 | #endif | |
90 | ||
ba0f32d4 | 91 | STATIC int xlog_iclogs_empty(xlog_t *log); |
1da177e4 | 92 | |
dd954c69 | 93 | static void |
663e496a DC |
94 | xlog_grant_sub_space( |
95 | struct log *log, | |
c8a09ff8 | 96 | atomic64_t *head, |
663e496a | 97 | int bytes) |
dd954c69 | 98 | { |
d0eb2f38 DC |
99 | int64_t head_val = atomic64_read(head); |
100 | int64_t new, old; | |
a69ed03c | 101 | |
d0eb2f38 DC |
102 | do { |
103 | int cycle, space; | |
a69ed03c | 104 | |
d0eb2f38 | 105 | xlog_crack_grant_head_val(head_val, &cycle, &space); |
a69ed03c | 106 | |
d0eb2f38 DC |
107 | space -= bytes; |
108 | if (space < 0) { | |
109 | space += log->l_logsize; | |
110 | cycle--; | |
111 | } | |
112 | ||
113 | old = head_val; | |
114 | new = xlog_assign_grant_head_val(cycle, space); | |
115 | head_val = atomic64_cmpxchg(head, old, new); | |
116 | } while (head_val != old); | |
dd954c69 CH |
117 | } |
118 | ||
119 | static void | |
663e496a DC |
120 | xlog_grant_add_space( |
121 | struct log *log, | |
c8a09ff8 | 122 | atomic64_t *head, |
663e496a | 123 | int bytes) |
dd954c69 | 124 | { |
d0eb2f38 DC |
125 | int64_t head_val = atomic64_read(head); |
126 | int64_t new, old; | |
a69ed03c | 127 | |
d0eb2f38 DC |
128 | do { |
129 | int tmp; | |
130 | int cycle, space; | |
a69ed03c | 131 | |
d0eb2f38 | 132 | xlog_crack_grant_head_val(head_val, &cycle, &space); |
a69ed03c | 133 | |
d0eb2f38 DC |
134 | tmp = log->l_logsize - space; |
135 | if (tmp > bytes) | |
136 | space += bytes; | |
137 | else { | |
138 | space = bytes - tmp; | |
139 | cycle++; | |
140 | } | |
141 | ||
142 | old = head_val; | |
143 | new = xlog_assign_grant_head_val(cycle, space); | |
144 | head_val = atomic64_cmpxchg(head, old, new); | |
145 | } while (head_val != old); | |
dd954c69 | 146 | } |
a69ed03c | 147 | |
c303c5b8 CH |
148 | STATIC void |
149 | xlog_grant_head_init( | |
150 | struct xlog_grant_head *head) | |
151 | { | |
152 | xlog_assign_grant_head(&head->grant, 1, 0); | |
153 | INIT_LIST_HEAD(&head->waiters); | |
154 | spin_lock_init(&head->lock); | |
155 | } | |
156 | ||
a79bf2d7 CH |
157 | STATIC void |
158 | xlog_grant_head_wake_all( | |
159 | struct xlog_grant_head *head) | |
160 | { | |
161 | struct xlog_ticket *tic; | |
162 | ||
163 | spin_lock(&head->lock); | |
164 | list_for_each_entry(tic, &head->waiters, t_queue) | |
165 | wake_up_process(tic->t_task); | |
166 | spin_unlock(&head->lock); | |
167 | } | |
168 | ||
e179840d CH |
169 | static inline int |
170 | xlog_ticket_reservation( | |
9f9c19ec | 171 | struct log *log, |
e179840d CH |
172 | struct xlog_grant_head *head, |
173 | struct xlog_ticket *tic) | |
9f9c19ec | 174 | { |
e179840d CH |
175 | if (head == &log->l_write_head) { |
176 | ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); | |
177 | return tic->t_unit_res; | |
178 | } else { | |
9f9c19ec | 179 | if (tic->t_flags & XLOG_TIC_PERM_RESERV) |
e179840d | 180 | return tic->t_unit_res * tic->t_cnt; |
9f9c19ec | 181 | else |
e179840d | 182 | return tic->t_unit_res; |
9f9c19ec | 183 | } |
9f9c19ec CH |
184 | } |
185 | ||
186 | STATIC bool | |
e179840d | 187 | xlog_grant_head_wake( |
9f9c19ec | 188 | struct log *log, |
e179840d | 189 | struct xlog_grant_head *head, |
9f9c19ec CH |
190 | int *free_bytes) |
191 | { | |
192 | struct xlog_ticket *tic; | |
193 | int need_bytes; | |
194 | ||
e179840d CH |
195 | list_for_each_entry(tic, &head->waiters, t_queue) { |
196 | need_bytes = xlog_ticket_reservation(log, head, tic); | |
9f9c19ec CH |
197 | if (*free_bytes < need_bytes) |
198 | return false; | |
9f9c19ec | 199 | |
e179840d CH |
200 | *free_bytes -= need_bytes; |
201 | trace_xfs_log_grant_wake_up(log, tic); | |
14a7235f | 202 | wake_up_process(tic->t_task); |
9f9c19ec CH |
203 | } |
204 | ||
205 | return true; | |
206 | } | |
207 | ||
208 | STATIC int | |
23ee3df3 | 209 | xlog_grant_head_wait( |
9f9c19ec | 210 | struct log *log, |
23ee3df3 | 211 | struct xlog_grant_head *head, |
9f9c19ec CH |
212 | struct xlog_ticket *tic, |
213 | int need_bytes) | |
214 | { | |
23ee3df3 | 215 | list_add_tail(&tic->t_queue, &head->waiters); |
9f9c19ec CH |
216 | |
217 | do { | |
218 | if (XLOG_FORCED_SHUTDOWN(log)) | |
219 | goto shutdown; | |
220 | xlog_grant_push_ail(log, need_bytes); | |
221 | ||
14a7235f | 222 | __set_current_state(TASK_UNINTERRUPTIBLE); |
23ee3df3 | 223 | spin_unlock(&head->lock); |
14a7235f | 224 | |
9f9c19ec | 225 | XFS_STATS_INC(xs_sleep_logspace); |
9f9c19ec | 226 | |
14a7235f CH |
227 | trace_xfs_log_grant_sleep(log, tic); |
228 | schedule(); | |
9f9c19ec CH |
229 | trace_xfs_log_grant_wake(log, tic); |
230 | ||
23ee3df3 | 231 | spin_lock(&head->lock); |
9f9c19ec CH |
232 | if (XLOG_FORCED_SHUTDOWN(log)) |
233 | goto shutdown; | |
23ee3df3 | 234 | } while (xlog_space_left(log, &head->grant) < need_bytes); |
9f9c19ec CH |
235 | |
236 | list_del_init(&tic->t_queue); | |
237 | return 0; | |
238 | shutdown: | |
239 | list_del_init(&tic->t_queue); | |
240 | return XFS_ERROR(EIO); | |
241 | } | |
242 | ||
42ceedb3 CH |
243 | /* |
244 | * Atomically get the log space required for a log ticket. | |
245 | * | |
246 | * Once a ticket gets put onto head->waiters, it will only return after the | |
247 | * needed reservation is satisfied. | |
248 | * | |
249 | * This function is structured so that it has a lock free fast path. This is | |
250 | * necessary because every new transaction reservation will come through this | |
251 | * path. Hence any lock will be globally hot if we take it unconditionally on | |
252 | * every pass. | |
253 | * | |
254 | * As tickets are only ever moved on and off head->waiters under head->lock, we | |
255 | * only need to take that lock if we are going to add the ticket to the queue | |
256 | * and sleep. We can avoid taking the lock if the ticket was never added to | |
257 | * head->waiters because the t_queue list head will be empty and we hold the | |
258 | * only reference to it so it can safely be checked unlocked. | |
259 | */ | |
260 | STATIC int | |
261 | xlog_grant_head_check( | |
262 | struct log *log, | |
263 | struct xlog_grant_head *head, | |
264 | struct xlog_ticket *tic, | |
265 | int *need_bytes) | |
266 | { | |
267 | int free_bytes; | |
268 | int error = 0; | |
269 | ||
270 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); | |
271 | ||
272 | /* | |
273 | * If there are other waiters on the queue then give them a chance at | |
274 | * logspace before us. Wake up the first waiters, if we do not wake | |
275 | * up all the waiters then go to sleep waiting for more free space, | |
276 | * otherwise try to get some space for this transaction. | |
277 | */ | |
278 | *need_bytes = xlog_ticket_reservation(log, head, tic); | |
279 | free_bytes = xlog_space_left(log, &head->grant); | |
280 | if (!list_empty_careful(&head->waiters)) { | |
281 | spin_lock(&head->lock); | |
282 | if (!xlog_grant_head_wake(log, head, &free_bytes) || | |
283 | free_bytes < *need_bytes) { | |
284 | error = xlog_grant_head_wait(log, head, tic, | |
285 | *need_bytes); | |
286 | } | |
287 | spin_unlock(&head->lock); | |
288 | } else if (free_bytes < *need_bytes) { | |
289 | spin_lock(&head->lock); | |
290 | error = xlog_grant_head_wait(log, head, tic, *need_bytes); | |
291 | spin_unlock(&head->lock); | |
292 | } | |
293 | ||
294 | return error; | |
295 | } | |
296 | ||
0adba536 CH |
297 | static void |
298 | xlog_tic_reset_res(xlog_ticket_t *tic) | |
299 | { | |
300 | tic->t_res_num = 0; | |
301 | tic->t_res_arr_sum = 0; | |
302 | tic->t_res_num_ophdrs = 0; | |
303 | } | |
304 | ||
305 | static void | |
306 | xlog_tic_add_region(xlog_ticket_t *tic, uint len, uint type) | |
307 | { | |
308 | if (tic->t_res_num == XLOG_TIC_LEN_MAX) { | |
309 | /* add to overflow and start again */ | |
310 | tic->t_res_o_flow += tic->t_res_arr_sum; | |
311 | tic->t_res_num = 0; | |
312 | tic->t_res_arr_sum = 0; | |
313 | } | |
314 | ||
315 | tic->t_res_arr[tic->t_res_num].r_len = len; | |
316 | tic->t_res_arr[tic->t_res_num].r_type = type; | |
317 | tic->t_res_arr_sum += len; | |
318 | tic->t_res_num++; | |
319 | } | |
dd954c69 | 320 | |
9006fb91 CH |
321 | /* |
322 | * Replenish the byte reservation required by moving the grant write head. | |
323 | */ | |
324 | int | |
325 | xfs_log_regrant( | |
326 | struct xfs_mount *mp, | |
327 | struct xlog_ticket *tic) | |
328 | { | |
329 | struct log *log = mp->m_log; | |
330 | int need_bytes; | |
331 | int error = 0; | |
332 | ||
333 | if (XLOG_FORCED_SHUTDOWN(log)) | |
334 | return XFS_ERROR(EIO); | |
335 | ||
336 | XFS_STATS_INC(xs_try_logspace); | |
337 | ||
338 | /* | |
339 | * This is a new transaction on the ticket, so we need to change the | |
340 | * transaction ID so that the next transaction has a different TID in | |
341 | * the log. Just add one to the existing tid so that we can see chains | |
342 | * of rolling transactions in the log easily. | |
343 | */ | |
344 | tic->t_tid++; | |
345 | ||
346 | xlog_grant_push_ail(log, tic->t_unit_res); | |
347 | ||
348 | tic->t_curr_res = tic->t_unit_res; | |
349 | xlog_tic_reset_res(tic); | |
350 | ||
351 | if (tic->t_cnt > 0) | |
352 | return 0; | |
353 | ||
354 | trace_xfs_log_regrant(log, tic); | |
355 | ||
356 | error = xlog_grant_head_check(log, &log->l_write_head, tic, | |
357 | &need_bytes); | |
358 | if (error) | |
359 | goto out_error; | |
360 | ||
361 | xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes); | |
362 | trace_xfs_log_regrant_exit(log, tic); | |
363 | xlog_verify_grant_tail(log); | |
364 | return 0; | |
365 | ||
366 | out_error: | |
367 | /* | |
368 | * If we are failing, make sure the ticket doesn't have any current | |
369 | * reservations. We don't want to add this back when the ticket/ | |
370 | * transaction gets cancelled. | |
371 | */ | |
372 | tic->t_curr_res = 0; | |
373 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
374 | return error; | |
375 | } | |
376 | ||
377 | /* | |
378 | * Reserve log space and return a ticket corresponding the reservation. | |
379 | * | |
380 | * Each reservation is going to reserve extra space for a log record header. | |
381 | * When writes happen to the on-disk log, we don't subtract the length of the | |
382 | * log record header from any reservation. By wasting space in each | |
383 | * reservation, we prevent over allocation problems. | |
384 | */ | |
385 | int | |
386 | xfs_log_reserve( | |
387 | struct xfs_mount *mp, | |
388 | int unit_bytes, | |
389 | int cnt, | |
390 | struct xlog_ticket **ticp, | |
391 | __uint8_t client, | |
392 | bool permanent, | |
393 | uint t_type) | |
394 | { | |
395 | struct log *log = mp->m_log; | |
396 | struct xlog_ticket *tic; | |
397 | int need_bytes; | |
398 | int error = 0; | |
399 | ||
400 | ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); | |
401 | ||
402 | if (XLOG_FORCED_SHUTDOWN(log)) | |
403 | return XFS_ERROR(EIO); | |
404 | ||
405 | XFS_STATS_INC(xs_try_logspace); | |
406 | ||
407 | ASSERT(*ticp == NULL); | |
408 | tic = xlog_ticket_alloc(log, unit_bytes, cnt, client, permanent, | |
409 | KM_SLEEP | KM_MAYFAIL); | |
410 | if (!tic) | |
411 | return XFS_ERROR(ENOMEM); | |
412 | ||
413 | tic->t_trans_type = t_type; | |
414 | *ticp = tic; | |
415 | ||
416 | xlog_grant_push_ail(log, tic->t_unit_res * tic->t_cnt); | |
417 | ||
418 | trace_xfs_log_reserve(log, tic); | |
419 | ||
420 | error = xlog_grant_head_check(log, &log->l_reserve_head, tic, | |
421 | &need_bytes); | |
422 | if (error) | |
423 | goto out_error; | |
424 | ||
425 | xlog_grant_add_space(log, &log->l_reserve_head.grant, need_bytes); | |
426 | xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes); | |
427 | trace_xfs_log_reserve_exit(log, tic); | |
428 | xlog_verify_grant_tail(log); | |
429 | return 0; | |
430 | ||
431 | out_error: | |
432 | /* | |
433 | * If we are failing, make sure the ticket doesn't have any current | |
434 | * reservations. We don't want to add this back when the ticket/ | |
435 | * transaction gets cancelled. | |
436 | */ | |
437 | tic->t_curr_res = 0; | |
438 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
439 | return error; | |
440 | } | |
441 | ||
442 | ||
1da177e4 LT |
443 | /* |
444 | * NOTES: | |
445 | * | |
446 | * 1. currblock field gets updated at startup and after in-core logs | |
447 | * marked as with WANT_SYNC. | |
448 | */ | |
449 | ||
450 | /* | |
451 | * This routine is called when a user of a log manager ticket is done with | |
452 | * the reservation. If the ticket was ever used, then a commit record for | |
453 | * the associated transaction is written out as a log operation header with | |
454 | * no data. The flag XLOG_TIC_INITED is set when the first write occurs with | |
455 | * a given ticket. If the ticket was one with a permanent reservation, then | |
456 | * a few operations are done differently. Permanent reservation tickets by | |
457 | * default don't release the reservation. They just commit the current | |
458 | * transaction with the belief that the reservation is still needed. A flag | |
459 | * must be passed in before permanent reservations are actually released. | |
460 | * When these type of tickets are not released, they need to be set into | |
461 | * the inited state again. By doing this, a start record will be written | |
462 | * out when the next write occurs. | |
463 | */ | |
464 | xfs_lsn_t | |
35a8a72f CH |
465 | xfs_log_done( |
466 | struct xfs_mount *mp, | |
467 | struct xlog_ticket *ticket, | |
468 | struct xlog_in_core **iclog, | |
469 | uint flags) | |
1da177e4 | 470 | { |
35a8a72f CH |
471 | struct log *log = mp->m_log; |
472 | xfs_lsn_t lsn = 0; | |
1da177e4 | 473 | |
1da177e4 LT |
474 | if (XLOG_FORCED_SHUTDOWN(log) || |
475 | /* | |
476 | * If nothing was ever written, don't write out commit record. | |
477 | * If we get an error, just continue and give back the log ticket. | |
478 | */ | |
479 | (((ticket->t_flags & XLOG_TIC_INITED) == 0) && | |
55b66332 | 480 | (xlog_commit_record(log, ticket, iclog, &lsn)))) { |
1da177e4 LT |
481 | lsn = (xfs_lsn_t) -1; |
482 | if (ticket->t_flags & XLOG_TIC_PERM_RESERV) { | |
483 | flags |= XFS_LOG_REL_PERM_RESERV; | |
484 | } | |
485 | } | |
486 | ||
487 | ||
488 | if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 || | |
489 | (flags & XFS_LOG_REL_PERM_RESERV)) { | |
0b1b213f CH |
490 | trace_xfs_log_done_nonperm(log, ticket); |
491 | ||
1da177e4 | 492 | /* |
c41564b5 | 493 | * Release ticket if not permanent reservation or a specific |
1da177e4 LT |
494 | * request has been made to release a permanent reservation. |
495 | */ | |
496 | xlog_ungrant_log_space(log, ticket); | |
cc09c0dc | 497 | xfs_log_ticket_put(ticket); |
1da177e4 | 498 | } else { |
0b1b213f CH |
499 | trace_xfs_log_done_perm(log, ticket); |
500 | ||
1da177e4 | 501 | xlog_regrant_reserve_log_space(log, ticket); |
c6a7b0f8 LM |
502 | /* If this ticket was a permanent reservation and we aren't |
503 | * trying to release it, reset the inited flags; so next time | |
504 | * we write, a start record will be written out. | |
505 | */ | |
1da177e4 | 506 | ticket->t_flags |= XLOG_TIC_INITED; |
c6a7b0f8 | 507 | } |
1da177e4 LT |
508 | |
509 | return lsn; | |
35a8a72f | 510 | } |
1da177e4 | 511 | |
1da177e4 LT |
512 | /* |
513 | * Attaches a new iclog I/O completion callback routine during | |
514 | * transaction commit. If the log is in error state, a non-zero | |
515 | * return code is handed back and the caller is responsible for | |
516 | * executing the callback at an appropriate time. | |
517 | */ | |
518 | int | |
35a8a72f CH |
519 | xfs_log_notify( |
520 | struct xfs_mount *mp, | |
521 | struct xlog_in_core *iclog, | |
522 | xfs_log_callback_t *cb) | |
1da177e4 | 523 | { |
b22cd72c | 524 | int abortflg; |
1da177e4 | 525 | |
114d23aa | 526 | spin_lock(&iclog->ic_callback_lock); |
1da177e4 LT |
527 | abortflg = (iclog->ic_state & XLOG_STATE_IOERROR); |
528 | if (!abortflg) { | |
529 | ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) || | |
530 | (iclog->ic_state == XLOG_STATE_WANT_SYNC)); | |
531 | cb->cb_next = NULL; | |
532 | *(iclog->ic_callback_tail) = cb; | |
533 | iclog->ic_callback_tail = &(cb->cb_next); | |
534 | } | |
114d23aa | 535 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 | 536 | return abortflg; |
35a8a72f | 537 | } |
1da177e4 LT |
538 | |
539 | int | |
35a8a72f CH |
540 | xfs_log_release_iclog( |
541 | struct xfs_mount *mp, | |
542 | struct xlog_in_core *iclog) | |
1da177e4 | 543 | { |
35a8a72f | 544 | if (xlog_state_release_iclog(mp->m_log, iclog)) { |
7d04a335 | 545 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
014c2544 | 546 | return EIO; |
1da177e4 LT |
547 | } |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
1da177e4 LT |
552 | /* |
553 | * Mount a log filesystem | |
554 | * | |
555 | * mp - ubiquitous xfs mount point structure | |
556 | * log_target - buftarg of on-disk log device | |
557 | * blk_offset - Start block # where block size is 512 bytes (BBSIZE) | |
558 | * num_bblocks - Number of BBSIZE blocks in on-disk log | |
559 | * | |
560 | * Return error or zero. | |
561 | */ | |
562 | int | |
249a8c11 DC |
563 | xfs_log_mount( |
564 | xfs_mount_t *mp, | |
565 | xfs_buftarg_t *log_target, | |
566 | xfs_daddr_t blk_offset, | |
567 | int num_bblks) | |
1da177e4 | 568 | { |
249a8c11 DC |
569 | int error; |
570 | ||
1da177e4 | 571 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) |
a0fa2b67 | 572 | xfs_notice(mp, "Mounting Filesystem"); |
1da177e4 | 573 | else { |
a0fa2b67 DC |
574 | xfs_notice(mp, |
575 | "Mounting filesystem in no-recovery mode. Filesystem will be inconsistent."); | |
bd186aa9 | 576 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
577 | } |
578 | ||
579 | mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); | |
a6cb767e DC |
580 | if (IS_ERR(mp->m_log)) { |
581 | error = -PTR_ERR(mp->m_log); | |
644c3567 DC |
582 | goto out; |
583 | } | |
1da177e4 | 584 | |
249a8c11 DC |
585 | /* |
586 | * Initialize the AIL now we have a log. | |
587 | */ | |
249a8c11 DC |
588 | error = xfs_trans_ail_init(mp); |
589 | if (error) { | |
a0fa2b67 | 590 | xfs_warn(mp, "AIL initialisation failed: error %d", error); |
26430752 | 591 | goto out_free_log; |
249a8c11 | 592 | } |
a9c21c1b | 593 | mp->m_log->l_ailp = mp->m_ail; |
249a8c11 | 594 | |
1da177e4 LT |
595 | /* |
596 | * skip log recovery on a norecovery mount. pretend it all | |
597 | * just worked. | |
598 | */ | |
599 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { | |
249a8c11 | 600 | int readonly = (mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
601 | |
602 | if (readonly) | |
bd186aa9 | 603 | mp->m_flags &= ~XFS_MOUNT_RDONLY; |
1da177e4 | 604 | |
65be6054 | 605 | error = xlog_recover(mp->m_log); |
1da177e4 LT |
606 | |
607 | if (readonly) | |
bd186aa9 | 608 | mp->m_flags |= XFS_MOUNT_RDONLY; |
1da177e4 | 609 | if (error) { |
a0fa2b67 DC |
610 | xfs_warn(mp, "log mount/recovery failed: error %d", |
611 | error); | |
26430752 | 612 | goto out_destroy_ail; |
1da177e4 LT |
613 | } |
614 | } | |
615 | ||
616 | /* Normal transactions can now occur */ | |
617 | mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; | |
618 | ||
71e330b5 DC |
619 | /* |
620 | * Now the log has been fully initialised and we know were our | |
621 | * space grant counters are, we can initialise the permanent ticket | |
622 | * needed for delayed logging to work. | |
623 | */ | |
624 | xlog_cil_init_post_recovery(mp->m_log); | |
625 | ||
1da177e4 | 626 | return 0; |
26430752 CH |
627 | |
628 | out_destroy_ail: | |
629 | xfs_trans_ail_destroy(mp); | |
630 | out_free_log: | |
631 | xlog_dealloc_log(mp->m_log); | |
644c3567 | 632 | out: |
249a8c11 | 633 | return error; |
26430752 | 634 | } |
1da177e4 LT |
635 | |
636 | /* | |
637 | * Finish the recovery of the file system. This is separate from | |
638 | * the xfs_log_mount() call, because it depends on the code in | |
639 | * xfs_mountfs() to read in the root and real-time bitmap inodes | |
640 | * between calling xfs_log_mount() and here. | |
641 | * | |
642 | * mp - ubiquitous xfs mount point structure | |
643 | */ | |
644 | int | |
4249023a | 645 | xfs_log_mount_finish(xfs_mount_t *mp) |
1da177e4 LT |
646 | { |
647 | int error; | |
648 | ||
649 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) | |
4249023a | 650 | error = xlog_recover_finish(mp->m_log); |
1da177e4 LT |
651 | else { |
652 | error = 0; | |
bd186aa9 | 653 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
654 | } |
655 | ||
656 | return error; | |
657 | } | |
658 | ||
1da177e4 LT |
659 | /* |
660 | * Final log writes as part of unmount. | |
661 | * | |
662 | * Mark the filesystem clean as unmount happens. Note that during relocation | |
663 | * this routine needs to be executed as part of source-bag while the | |
664 | * deallocation must not be done until source-end. | |
665 | */ | |
666 | ||
667 | /* | |
668 | * Unmount record used to have a string "Unmount filesystem--" in the | |
669 | * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE). | |
670 | * We just write the magic number now since that particular field isn't | |
671 | * currently architecture converted and "nUmount" is a bit foo. | |
672 | * As far as I know, there weren't any dependencies on the old behaviour. | |
673 | */ | |
674 | ||
675 | int | |
676 | xfs_log_unmount_write(xfs_mount_t *mp) | |
677 | { | |
678 | xlog_t *log = mp->m_log; | |
679 | xlog_in_core_t *iclog; | |
680 | #ifdef DEBUG | |
681 | xlog_in_core_t *first_iclog; | |
682 | #endif | |
35a8a72f | 683 | xlog_ticket_t *tic = NULL; |
1da177e4 LT |
684 | xfs_lsn_t lsn; |
685 | int error; | |
1da177e4 | 686 | |
1da177e4 LT |
687 | /* |
688 | * Don't write out unmount record on read-only mounts. | |
689 | * Or, if we are doing a forced umount (typically because of IO errors). | |
690 | */ | |
bd186aa9 | 691 | if (mp->m_flags & XFS_MOUNT_RDONLY) |
1da177e4 LT |
692 | return 0; |
693 | ||
a14a348b | 694 | error = _xfs_log_force(mp, XFS_LOG_SYNC, NULL); |
b911ca04 | 695 | ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log))); |
1da177e4 LT |
696 | |
697 | #ifdef DEBUG | |
698 | first_iclog = iclog = log->l_iclog; | |
699 | do { | |
700 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
701 | ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE); | |
702 | ASSERT(iclog->ic_offset == 0); | |
703 | } | |
704 | iclog = iclog->ic_next; | |
705 | } while (iclog != first_iclog); | |
706 | #endif | |
707 | if (! (XLOG_FORCED_SHUTDOWN(log))) { | |
955e47ad TS |
708 | error = xfs_log_reserve(mp, 600, 1, &tic, |
709 | XFS_LOG, 0, XLOG_UNMOUNT_REC_TYPE); | |
1da177e4 | 710 | if (!error) { |
55b66332 DC |
711 | /* the data section must be 32 bit size aligned */ |
712 | struct { | |
713 | __uint16_t magic; | |
714 | __uint16_t pad1; | |
715 | __uint32_t pad2; /* may as well make it 64 bits */ | |
716 | } magic = { | |
717 | .magic = XLOG_UNMOUNT_TYPE, | |
718 | }; | |
719 | struct xfs_log_iovec reg = { | |
4e0d5f92 | 720 | .i_addr = &magic, |
55b66332 DC |
721 | .i_len = sizeof(magic), |
722 | .i_type = XLOG_REG_TYPE_UNMOUNT, | |
723 | }; | |
724 | struct xfs_log_vec vec = { | |
725 | .lv_niovecs = 1, | |
726 | .lv_iovecp = ®, | |
727 | }; | |
728 | ||
3948659e | 729 | /* remove inited flag, and account for space used */ |
55b66332 | 730 | tic->t_flags = 0; |
3948659e | 731 | tic->t_curr_res -= sizeof(magic); |
55b66332 | 732 | error = xlog_write(log, &vec, tic, &lsn, |
1da177e4 LT |
733 | NULL, XLOG_UNMOUNT_TRANS); |
734 | /* | |
735 | * At this point, we're umounting anyway, | |
736 | * so there's no point in transitioning log state | |
737 | * to IOERROR. Just continue... | |
738 | */ | |
739 | } | |
740 | ||
a0fa2b67 DC |
741 | if (error) |
742 | xfs_alert(mp, "%s: unmount record failed", __func__); | |
1da177e4 LT |
743 | |
744 | ||
b22cd72c | 745 | spin_lock(&log->l_icloglock); |
1da177e4 | 746 | iclog = log->l_iclog; |
155cc6b7 | 747 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 | 748 | xlog_state_want_sync(log, iclog); |
39e2defe | 749 | spin_unlock(&log->l_icloglock); |
1bb7d6b5 | 750 | error = xlog_state_release_iclog(log, iclog); |
1da177e4 | 751 | |
b22cd72c | 752 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
753 | if (!(iclog->ic_state == XLOG_STATE_ACTIVE || |
754 | iclog->ic_state == XLOG_STATE_DIRTY)) { | |
755 | if (!XLOG_FORCED_SHUTDOWN(log)) { | |
eb40a875 DC |
756 | xlog_wait(&iclog->ic_force_wait, |
757 | &log->l_icloglock); | |
1da177e4 | 758 | } else { |
b22cd72c | 759 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
760 | } |
761 | } else { | |
b22cd72c | 762 | spin_unlock(&log->l_icloglock); |
1da177e4 | 763 | } |
955e47ad | 764 | if (tic) { |
0b1b213f | 765 | trace_xfs_log_umount_write(log, tic); |
955e47ad | 766 | xlog_ungrant_log_space(log, tic); |
cc09c0dc | 767 | xfs_log_ticket_put(tic); |
955e47ad | 768 | } |
1da177e4 LT |
769 | } else { |
770 | /* | |
771 | * We're already in forced_shutdown mode, couldn't | |
772 | * even attempt to write out the unmount transaction. | |
773 | * | |
774 | * Go through the motions of sync'ing and releasing | |
775 | * the iclog, even though no I/O will actually happen, | |
c41564b5 | 776 | * we need to wait for other log I/Os that may already |
1da177e4 LT |
777 | * be in progress. Do this as a separate section of |
778 | * code so we'll know if we ever get stuck here that | |
779 | * we're in this odd situation of trying to unmount | |
780 | * a file system that went into forced_shutdown as | |
781 | * the result of an unmount.. | |
782 | */ | |
b22cd72c | 783 | spin_lock(&log->l_icloglock); |
1da177e4 | 784 | iclog = log->l_iclog; |
155cc6b7 | 785 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 LT |
786 | |
787 | xlog_state_want_sync(log, iclog); | |
39e2defe | 788 | spin_unlock(&log->l_icloglock); |
1bb7d6b5 | 789 | error = xlog_state_release_iclog(log, iclog); |
1da177e4 | 790 | |
b22cd72c | 791 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
792 | |
793 | if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE | |
794 | || iclog->ic_state == XLOG_STATE_DIRTY | |
795 | || iclog->ic_state == XLOG_STATE_IOERROR) ) { | |
796 | ||
eb40a875 DC |
797 | xlog_wait(&iclog->ic_force_wait, |
798 | &log->l_icloglock); | |
1da177e4 | 799 | } else { |
b22cd72c | 800 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
801 | } |
802 | } | |
803 | ||
1bb7d6b5 | 804 | return error; |
1da177e4 LT |
805 | } /* xfs_log_unmount_write */ |
806 | ||
807 | /* | |
808 | * Deallocate log structures for unmount/relocation. | |
249a8c11 DC |
809 | * |
810 | * We need to stop the aild from running before we destroy | |
811 | * and deallocate the log as the aild references the log. | |
1da177e4 LT |
812 | */ |
813 | void | |
21b699c8 | 814 | xfs_log_unmount(xfs_mount_t *mp) |
1da177e4 | 815 | { |
249a8c11 | 816 | xfs_trans_ail_destroy(mp); |
c41564b5 | 817 | xlog_dealloc_log(mp->m_log); |
1da177e4 LT |
818 | } |
819 | ||
43f5efc5 DC |
820 | void |
821 | xfs_log_item_init( | |
822 | struct xfs_mount *mp, | |
823 | struct xfs_log_item *item, | |
824 | int type, | |
272e42b2 | 825 | const struct xfs_item_ops *ops) |
43f5efc5 DC |
826 | { |
827 | item->li_mountp = mp; | |
828 | item->li_ailp = mp->m_ail; | |
829 | item->li_type = type; | |
830 | item->li_ops = ops; | |
71e330b5 DC |
831 | item->li_lv = NULL; |
832 | ||
833 | INIT_LIST_HEAD(&item->li_ail); | |
834 | INIT_LIST_HEAD(&item->li_cil); | |
43f5efc5 DC |
835 | } |
836 | ||
09a423a3 CH |
837 | /* |
838 | * Wake up processes waiting for log space after we have moved the log tail. | |
09a423a3 | 839 | */ |
1da177e4 | 840 | void |
09a423a3 | 841 | xfs_log_space_wake( |
cfb7cdca | 842 | struct xfs_mount *mp) |
1da177e4 | 843 | { |
09a423a3 | 844 | struct log *log = mp->m_log; |
cfb7cdca | 845 | int free_bytes; |
1da177e4 | 846 | |
1da177e4 LT |
847 | if (XLOG_FORCED_SHUTDOWN(log)) |
848 | return; | |
1da177e4 | 849 | |
28496968 | 850 | if (!list_empty_careful(&log->l_write_head.waiters)) { |
09a423a3 CH |
851 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); |
852 | ||
28496968 CH |
853 | spin_lock(&log->l_write_head.lock); |
854 | free_bytes = xlog_space_left(log, &log->l_write_head.grant); | |
e179840d | 855 | xlog_grant_head_wake(log, &log->l_write_head, &free_bytes); |
28496968 | 856 | spin_unlock(&log->l_write_head.lock); |
1da177e4 | 857 | } |
10547941 | 858 | |
28496968 | 859 | if (!list_empty_careful(&log->l_reserve_head.waiters)) { |
09a423a3 CH |
860 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); |
861 | ||
28496968 CH |
862 | spin_lock(&log->l_reserve_head.lock); |
863 | free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); | |
e179840d | 864 | xlog_grant_head_wake(log, &log->l_reserve_head, &free_bytes); |
28496968 | 865 | spin_unlock(&log->l_reserve_head.lock); |
1da177e4 | 866 | } |
3f16b985 | 867 | } |
1da177e4 LT |
868 | |
869 | /* | |
870 | * Determine if we have a transaction that has gone to disk | |
b6f8dd49 DC |
871 | * that needs to be covered. To begin the transition to the idle state |
872 | * firstly the log needs to be idle (no AIL and nothing in the iclogs). | |
873 | * If we are then in a state where covering is needed, the caller is informed | |
874 | * that dummy transactions are required to move the log into the idle state. | |
875 | * | |
876 | * Because this is called as part of the sync process, we should also indicate | |
877 | * that dummy transactions should be issued in anything but the covered or | |
878 | * idle states. This ensures that the log tail is accurately reflected in | |
879 | * the log at the end of the sync, hence if a crash occurrs avoids replay | |
880 | * of transactions where the metadata is already on disk. | |
1da177e4 LT |
881 | */ |
882 | int | |
883 | xfs_log_need_covered(xfs_mount_t *mp) | |
884 | { | |
27d8d5fe | 885 | int needed = 0; |
1da177e4 | 886 | xlog_t *log = mp->m_log; |
1da177e4 | 887 | |
92821e2b | 888 | if (!xfs_fs_writable(mp)) |
1da177e4 LT |
889 | return 0; |
890 | ||
b22cd72c | 891 | spin_lock(&log->l_icloglock); |
b6f8dd49 DC |
892 | switch (log->l_covered_state) { |
893 | case XLOG_STATE_COVER_DONE: | |
894 | case XLOG_STATE_COVER_DONE2: | |
895 | case XLOG_STATE_COVER_IDLE: | |
896 | break; | |
897 | case XLOG_STATE_COVER_NEED: | |
898 | case XLOG_STATE_COVER_NEED2: | |
fd074841 | 899 | if (!xfs_ail_min_lsn(log->l_ailp) && |
b6f8dd49 DC |
900 | xlog_iclogs_empty(log)) { |
901 | if (log->l_covered_state == XLOG_STATE_COVER_NEED) | |
902 | log->l_covered_state = XLOG_STATE_COVER_DONE; | |
903 | else | |
904 | log->l_covered_state = XLOG_STATE_COVER_DONE2; | |
1da177e4 | 905 | } |
b6f8dd49 DC |
906 | /* FALLTHRU */ |
907 | default: | |
1da177e4 | 908 | needed = 1; |
b6f8dd49 | 909 | break; |
1da177e4 | 910 | } |
b22cd72c | 911 | spin_unlock(&log->l_icloglock); |
014c2544 | 912 | return needed; |
1da177e4 LT |
913 | } |
914 | ||
09a423a3 | 915 | /* |
1da177e4 LT |
916 | * We may be holding the log iclog lock upon entering this routine. |
917 | */ | |
918 | xfs_lsn_t | |
1c304625 | 919 | xlog_assign_tail_lsn_locked( |
1c3cb9ec | 920 | struct xfs_mount *mp) |
1da177e4 | 921 | { |
1c3cb9ec | 922 | struct log *log = mp->m_log; |
1c304625 CH |
923 | struct xfs_log_item *lip; |
924 | xfs_lsn_t tail_lsn; | |
925 | ||
926 | assert_spin_locked(&mp->m_ail->xa_lock); | |
1da177e4 | 927 | |
09a423a3 CH |
928 | /* |
929 | * To make sure we always have a valid LSN for the log tail we keep | |
930 | * track of the last LSN which was committed in log->l_last_sync_lsn, | |
1c304625 | 931 | * and use that when the AIL was empty. |
09a423a3 | 932 | */ |
1c304625 CH |
933 | lip = xfs_ail_min(mp->m_ail); |
934 | if (lip) | |
935 | tail_lsn = lip->li_lsn; | |
936 | else | |
84f3c683 | 937 | tail_lsn = atomic64_read(&log->l_last_sync_lsn); |
1c3cb9ec | 938 | atomic64_set(&log->l_tail_lsn, tail_lsn); |
1da177e4 | 939 | return tail_lsn; |
1c3cb9ec | 940 | } |
1da177e4 | 941 | |
1c304625 CH |
942 | xfs_lsn_t |
943 | xlog_assign_tail_lsn( | |
944 | struct xfs_mount *mp) | |
945 | { | |
946 | xfs_lsn_t tail_lsn; | |
947 | ||
948 | spin_lock(&mp->m_ail->xa_lock); | |
949 | tail_lsn = xlog_assign_tail_lsn_locked(mp); | |
950 | spin_unlock(&mp->m_ail->xa_lock); | |
951 | ||
952 | return tail_lsn; | |
953 | } | |
954 | ||
1da177e4 LT |
955 | /* |
956 | * Return the space in the log between the tail and the head. The head | |
957 | * is passed in the cycle/bytes formal parms. In the special case where | |
958 | * the reserve head has wrapped passed the tail, this calculation is no | |
959 | * longer valid. In this case, just return 0 which means there is no space | |
960 | * in the log. This works for all places where this function is called | |
961 | * with the reserve head. Of course, if the write head were to ever | |
962 | * wrap the tail, we should blow up. Rather than catch this case here, | |
963 | * we depend on other ASSERTions in other parts of the code. XXXmiken | |
964 | * | |
965 | * This code also handles the case where the reservation head is behind | |
966 | * the tail. The details of this case are described below, but the end | |
967 | * result is that we return the size of the log as the amount of space left. | |
968 | */ | |
a8272ce0 | 969 | STATIC int |
a69ed03c DC |
970 | xlog_space_left( |
971 | struct log *log, | |
c8a09ff8 | 972 | atomic64_t *head) |
1da177e4 | 973 | { |
a69ed03c DC |
974 | int free_bytes; |
975 | int tail_bytes; | |
976 | int tail_cycle; | |
977 | int head_cycle; | |
978 | int head_bytes; | |
1da177e4 | 979 | |
a69ed03c | 980 | xlog_crack_grant_head(head, &head_cycle, &head_bytes); |
1c3cb9ec DC |
981 | xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_bytes); |
982 | tail_bytes = BBTOB(tail_bytes); | |
a69ed03c DC |
983 | if (tail_cycle == head_cycle && head_bytes >= tail_bytes) |
984 | free_bytes = log->l_logsize - (head_bytes - tail_bytes); | |
985 | else if (tail_cycle + 1 < head_cycle) | |
1da177e4 | 986 | return 0; |
a69ed03c DC |
987 | else if (tail_cycle < head_cycle) { |
988 | ASSERT(tail_cycle == (head_cycle - 1)); | |
989 | free_bytes = tail_bytes - head_bytes; | |
1da177e4 LT |
990 | } else { |
991 | /* | |
992 | * The reservation head is behind the tail. | |
993 | * In this case we just want to return the size of the | |
994 | * log as the amount of space left. | |
995 | */ | |
a0fa2b67 | 996 | xfs_alert(log->l_mp, |
1da177e4 LT |
997 | "xlog_space_left: head behind tail\n" |
998 | " tail_cycle = %d, tail_bytes = %d\n" | |
999 | " GH cycle = %d, GH bytes = %d", | |
a69ed03c | 1000 | tail_cycle, tail_bytes, head_cycle, head_bytes); |
1da177e4 LT |
1001 | ASSERT(0); |
1002 | free_bytes = log->l_logsize; | |
1003 | } | |
1004 | return free_bytes; | |
a69ed03c | 1005 | } |
1da177e4 LT |
1006 | |
1007 | ||
1008 | /* | |
1009 | * Log function which is called when an io completes. | |
1010 | * | |
1011 | * The log manager needs its own routine, in order to control what | |
1012 | * happens with the buffer after the write completes. | |
1013 | */ | |
1014 | void | |
1015 | xlog_iodone(xfs_buf_t *bp) | |
1016 | { | |
adadbeef CH |
1017 | xlog_in_core_t *iclog = bp->b_fspriv; |
1018 | xlog_t *l = iclog->ic_log; | |
1019 | int aborted = 0; | |
1da177e4 LT |
1020 | |
1021 | /* | |
1022 | * Race to shutdown the filesystem if we see an error. | |
1023 | */ | |
5a52c2a5 | 1024 | if (XFS_TEST_ERROR((xfs_buf_geterror(bp)), l->l_mp, |
1da177e4 | 1025 | XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) { |
901796af | 1026 | xfs_buf_ioerror_alert(bp, __func__); |
c867cb61 | 1027 | xfs_buf_stale(bp); |
7d04a335 | 1028 | xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR); |
1da177e4 LT |
1029 | /* |
1030 | * This flag will be propagated to the trans-committed | |
1031 | * callback routines to let them know that the log-commit | |
1032 | * didn't succeed. | |
1033 | */ | |
1034 | aborted = XFS_LI_ABORTED; | |
1035 | } else if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
1036 | aborted = XFS_LI_ABORTED; | |
1037 | } | |
3db296f3 DC |
1038 | |
1039 | /* log I/O is always issued ASYNC */ | |
1040 | ASSERT(XFS_BUF_ISASYNC(bp)); | |
1da177e4 | 1041 | xlog_state_done_syncing(iclog, aborted); |
3db296f3 DC |
1042 | /* |
1043 | * do not reference the buffer (bp) here as we could race | |
1044 | * with it being freed after writing the unmount record to the | |
1045 | * log. | |
1046 | */ | |
1047 | ||
1da177e4 LT |
1048 | } /* xlog_iodone */ |
1049 | ||
1da177e4 LT |
1050 | /* |
1051 | * Return size of each in-core log record buffer. | |
1052 | * | |
9da096fd | 1053 | * All machines get 8 x 32kB buffers by default, unless tuned otherwise. |
1da177e4 LT |
1054 | * |
1055 | * If the filesystem blocksize is too large, we may need to choose a | |
1056 | * larger size since the directory code currently logs entire blocks. | |
1057 | */ | |
1058 | ||
1059 | STATIC void | |
1060 | xlog_get_iclog_buffer_size(xfs_mount_t *mp, | |
1061 | xlog_t *log) | |
1062 | { | |
1063 | int size; | |
1064 | int xhdrs; | |
1065 | ||
1cb51258 ES |
1066 | if (mp->m_logbufs <= 0) |
1067 | log->l_iclog_bufs = XLOG_MAX_ICLOGS; | |
1068 | else | |
cfcbbbd0 | 1069 | log->l_iclog_bufs = mp->m_logbufs; |
1da177e4 LT |
1070 | |
1071 | /* | |
1072 | * Buffer size passed in from mount system call. | |
1073 | */ | |
cfcbbbd0 | 1074 | if (mp->m_logbsize > 0) { |
1da177e4 LT |
1075 | size = log->l_iclog_size = mp->m_logbsize; |
1076 | log->l_iclog_size_log = 0; | |
1077 | while (size != 1) { | |
1078 | log->l_iclog_size_log++; | |
1079 | size >>= 1; | |
1080 | } | |
1081 | ||
62118709 | 1082 | if (xfs_sb_version_haslogv2(&mp->m_sb)) { |
9da096fd MP |
1083 | /* # headers = size / 32k |
1084 | * one header holds cycles from 32k of data | |
1da177e4 LT |
1085 | */ |
1086 | ||
1087 | xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE; | |
1088 | if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE) | |
1089 | xhdrs++; | |
1090 | log->l_iclog_hsize = xhdrs << BBSHIFT; | |
1091 | log->l_iclog_heads = xhdrs; | |
1092 | } else { | |
1093 | ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE); | |
1094 | log->l_iclog_hsize = BBSIZE; | |
1095 | log->l_iclog_heads = 1; | |
1096 | } | |
cfcbbbd0 | 1097 | goto done; |
1da177e4 LT |
1098 | } |
1099 | ||
9da096fd | 1100 | /* All machines use 32kB buffers by default. */ |
1cb51258 ES |
1101 | log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; |
1102 | log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; | |
1da177e4 LT |
1103 | |
1104 | /* the default log size is 16k or 32k which is one header sector */ | |
1105 | log->l_iclog_hsize = BBSIZE; | |
1106 | log->l_iclog_heads = 1; | |
1107 | ||
7153f8ba CH |
1108 | done: |
1109 | /* are we being asked to make the sizes selected above visible? */ | |
cfcbbbd0 NS |
1110 | if (mp->m_logbufs == 0) |
1111 | mp->m_logbufs = log->l_iclog_bufs; | |
1112 | if (mp->m_logbsize == 0) | |
1113 | mp->m_logbsize = log->l_iclog_size; | |
1da177e4 LT |
1114 | } /* xlog_get_iclog_buffer_size */ |
1115 | ||
1116 | ||
1117 | /* | |
1118 | * This routine initializes some of the log structure for a given mount point. | |
1119 | * Its primary purpose is to fill in enough, so recovery can occur. However, | |
1120 | * some other stuff may be filled in too. | |
1121 | */ | |
1122 | STATIC xlog_t * | |
1123 | xlog_alloc_log(xfs_mount_t *mp, | |
1124 | xfs_buftarg_t *log_target, | |
1125 | xfs_daddr_t blk_offset, | |
1126 | int num_bblks) | |
1127 | { | |
1128 | xlog_t *log; | |
1129 | xlog_rec_header_t *head; | |
1130 | xlog_in_core_t **iclogp; | |
1131 | xlog_in_core_t *iclog, *prev_iclog=NULL; | |
1132 | xfs_buf_t *bp; | |
1133 | int i; | |
a6cb767e | 1134 | int error = ENOMEM; |
69ce58f0 | 1135 | uint log2_size = 0; |
1da177e4 | 1136 | |
644c3567 | 1137 | log = kmem_zalloc(sizeof(xlog_t), KM_MAYFAIL); |
a6cb767e | 1138 | if (!log) { |
a0fa2b67 | 1139 | xfs_warn(mp, "Log allocation failed: No memory!"); |
a6cb767e DC |
1140 | goto out; |
1141 | } | |
1da177e4 LT |
1142 | |
1143 | log->l_mp = mp; | |
1144 | log->l_targ = log_target; | |
1145 | log->l_logsize = BBTOB(num_bblks); | |
1146 | log->l_logBBstart = blk_offset; | |
1147 | log->l_logBBsize = num_bblks; | |
1148 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
1149 | log->l_flags |= XLOG_ACTIVE_RECOVERY; | |
1150 | ||
1151 | log->l_prev_block = -1; | |
1da177e4 | 1152 | /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ |
1c3cb9ec DC |
1153 | xlog_assign_atomic_lsn(&log->l_tail_lsn, 1, 0); |
1154 | xlog_assign_atomic_lsn(&log->l_last_sync_lsn, 1, 0); | |
1da177e4 | 1155 | log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ |
c303c5b8 CH |
1156 | |
1157 | xlog_grant_head_init(&log->l_reserve_head); | |
1158 | xlog_grant_head_init(&log->l_write_head); | |
1da177e4 | 1159 | |
a6cb767e | 1160 | error = EFSCORRUPTED; |
62118709 | 1161 | if (xfs_sb_version_hassector(&mp->m_sb)) { |
69ce58f0 AE |
1162 | log2_size = mp->m_sb.sb_logsectlog; |
1163 | if (log2_size < BBSHIFT) { | |
a0fa2b67 DC |
1164 | xfs_warn(mp, "Log sector size too small (0x%x < 0x%x)", |
1165 | log2_size, BBSHIFT); | |
a6cb767e DC |
1166 | goto out_free_log; |
1167 | } | |
1168 | ||
69ce58f0 AE |
1169 | log2_size -= BBSHIFT; |
1170 | if (log2_size > mp->m_sectbb_log) { | |
a0fa2b67 DC |
1171 | xfs_warn(mp, "Log sector size too large (0x%x > 0x%x)", |
1172 | log2_size, mp->m_sectbb_log); | |
a6cb767e DC |
1173 | goto out_free_log; |
1174 | } | |
69ce58f0 AE |
1175 | |
1176 | /* for larger sector sizes, must have v2 or external log */ | |
1177 | if (log2_size && log->l_logBBstart > 0 && | |
1178 | !xfs_sb_version_haslogv2(&mp->m_sb)) { | |
a0fa2b67 DC |
1179 | xfs_warn(mp, |
1180 | "log sector size (0x%x) invalid for configuration.", | |
1181 | log2_size); | |
a6cb767e DC |
1182 | goto out_free_log; |
1183 | } | |
1da177e4 | 1184 | } |
69ce58f0 | 1185 | log->l_sectBBsize = 1 << log2_size; |
1da177e4 LT |
1186 | |
1187 | xlog_get_iclog_buffer_size(mp, log); | |
1188 | ||
a6cb767e | 1189 | error = ENOMEM; |
e70b73f8 | 1190 | bp = xfs_buf_alloc(mp->m_logdev_targp, 0, BTOBB(log->l_iclog_size), 0); |
644c3567 DC |
1191 | if (!bp) |
1192 | goto out_free_log; | |
cb669ca5 | 1193 | bp->b_iodone = xlog_iodone; |
0c842ad4 | 1194 | ASSERT(xfs_buf_islocked(bp)); |
1da177e4 LT |
1195 | log->l_xbuf = bp; |
1196 | ||
007c61c6 | 1197 | spin_lock_init(&log->l_icloglock); |
eb40a875 | 1198 | init_waitqueue_head(&log->l_flush_wait); |
1da177e4 LT |
1199 | |
1200 | /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */ | |
1201 | ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0); | |
1202 | ||
1203 | iclogp = &log->l_iclog; | |
1204 | /* | |
1205 | * The amount of memory to allocate for the iclog structure is | |
1206 | * rather funky due to the way the structure is defined. It is | |
1207 | * done this way so that we can use different sizes for machines | |
1208 | * with different amounts of memory. See the definition of | |
1209 | * xlog_in_core_t in xfs_log_priv.h for details. | |
1210 | */ | |
1da177e4 LT |
1211 | ASSERT(log->l_iclog_size >= 4096); |
1212 | for (i=0; i < log->l_iclog_bufs; i++) { | |
644c3567 DC |
1213 | *iclogp = kmem_zalloc(sizeof(xlog_in_core_t), KM_MAYFAIL); |
1214 | if (!*iclogp) | |
1215 | goto out_free_iclog; | |
1216 | ||
1da177e4 | 1217 | iclog = *iclogp; |
1da177e4 LT |
1218 | iclog->ic_prev = prev_iclog; |
1219 | prev_iclog = iclog; | |
1fa40b01 | 1220 | |
686865f7 | 1221 | bp = xfs_buf_get_uncached(mp->m_logdev_targp, |
e70b73f8 | 1222 | BTOBB(log->l_iclog_size), 0); |
644c3567 DC |
1223 | if (!bp) |
1224 | goto out_free_iclog; | |
c8da0faf | 1225 | |
cb669ca5 | 1226 | bp->b_iodone = xlog_iodone; |
1fa40b01 | 1227 | iclog->ic_bp = bp; |
b28708d6 | 1228 | iclog->ic_data = bp->b_addr; |
4679b2d3 | 1229 | #ifdef DEBUG |
1da177e4 | 1230 | log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); |
4679b2d3 | 1231 | #endif |
1da177e4 LT |
1232 | head = &iclog->ic_header; |
1233 | memset(head, 0, sizeof(xlog_rec_header_t)); | |
b53e675d CH |
1234 | head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM); |
1235 | head->h_version = cpu_to_be32( | |
62118709 | 1236 | xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? 2 : 1); |
b53e675d | 1237 | head->h_size = cpu_to_be32(log->l_iclog_size); |
1da177e4 | 1238 | /* new fields */ |
b53e675d | 1239 | head->h_fmt = cpu_to_be32(XLOG_FMT); |
1da177e4 LT |
1240 | memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); |
1241 | ||
1da177e4 LT |
1242 | iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize; |
1243 | iclog->ic_state = XLOG_STATE_ACTIVE; | |
1244 | iclog->ic_log = log; | |
114d23aa DC |
1245 | atomic_set(&iclog->ic_refcnt, 0); |
1246 | spin_lock_init(&iclog->ic_callback_lock); | |
1da177e4 | 1247 | iclog->ic_callback_tail = &(iclog->ic_callback); |
b28708d6 | 1248 | iclog->ic_datap = (char *)iclog->ic_data + log->l_iclog_hsize; |
1da177e4 | 1249 | |
0c842ad4 | 1250 | ASSERT(xfs_buf_islocked(iclog->ic_bp)); |
eb40a875 DC |
1251 | init_waitqueue_head(&iclog->ic_force_wait); |
1252 | init_waitqueue_head(&iclog->ic_write_wait); | |
1da177e4 LT |
1253 | |
1254 | iclogp = &iclog->ic_next; | |
1255 | } | |
1256 | *iclogp = log->l_iclog; /* complete ring */ | |
1257 | log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ | |
1258 | ||
71e330b5 DC |
1259 | error = xlog_cil_init(log); |
1260 | if (error) | |
1261 | goto out_free_iclog; | |
1da177e4 | 1262 | return log; |
644c3567 DC |
1263 | |
1264 | out_free_iclog: | |
1265 | for (iclog = log->l_iclog; iclog; iclog = prev_iclog) { | |
1266 | prev_iclog = iclog->ic_next; | |
eb40a875 | 1267 | if (iclog->ic_bp) |
644c3567 | 1268 | xfs_buf_free(iclog->ic_bp); |
644c3567 DC |
1269 | kmem_free(iclog); |
1270 | } | |
1271 | spinlock_destroy(&log->l_icloglock); | |
644c3567 DC |
1272 | xfs_buf_free(log->l_xbuf); |
1273 | out_free_log: | |
1274 | kmem_free(log); | |
a6cb767e DC |
1275 | out: |
1276 | return ERR_PTR(-error); | |
1da177e4 LT |
1277 | } /* xlog_alloc_log */ |
1278 | ||
1279 | ||
1280 | /* | |
1281 | * Write out the commit record of a transaction associated with the given | |
1282 | * ticket. Return the lsn of the commit record. | |
1283 | */ | |
1284 | STATIC int | |
55b66332 DC |
1285 | xlog_commit_record( |
1286 | struct log *log, | |
1287 | struct xlog_ticket *ticket, | |
1288 | struct xlog_in_core **iclog, | |
1289 | xfs_lsn_t *commitlsnp) | |
1da177e4 | 1290 | { |
55b66332 DC |
1291 | struct xfs_mount *mp = log->l_mp; |
1292 | int error; | |
1293 | struct xfs_log_iovec reg = { | |
1294 | .i_addr = NULL, | |
1295 | .i_len = 0, | |
1296 | .i_type = XLOG_REG_TYPE_COMMIT, | |
1297 | }; | |
1298 | struct xfs_log_vec vec = { | |
1299 | .lv_niovecs = 1, | |
1300 | .lv_iovecp = ®, | |
1301 | }; | |
1da177e4 LT |
1302 | |
1303 | ASSERT_ALWAYS(iclog); | |
55b66332 DC |
1304 | error = xlog_write(log, &vec, ticket, commitlsnp, iclog, |
1305 | XLOG_COMMIT_TRANS); | |
1306 | if (error) | |
7d04a335 | 1307 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
014c2544 | 1308 | return error; |
55b66332 | 1309 | } |
1da177e4 LT |
1310 | |
1311 | /* | |
1312 | * Push on the buffer cache code if we ever use more than 75% of the on-disk | |
1313 | * log space. This code pushes on the lsn which would supposedly free up | |
1314 | * the 25% which we want to leave free. We may need to adopt a policy which | |
1315 | * pushes on an lsn which is further along in the log once we reach the high | |
1316 | * water mark. In this manner, we would be creating a low water mark. | |
1317 | */ | |
a8272ce0 | 1318 | STATIC void |
2ced19cb DC |
1319 | xlog_grant_push_ail( |
1320 | struct log *log, | |
1321 | int need_bytes) | |
1da177e4 | 1322 | { |
2ced19cb | 1323 | xfs_lsn_t threshold_lsn = 0; |
84f3c683 | 1324 | xfs_lsn_t last_sync_lsn; |
2ced19cb DC |
1325 | int free_blocks; |
1326 | int free_bytes; | |
1327 | int threshold_block; | |
1328 | int threshold_cycle; | |
1329 | int free_threshold; | |
1330 | ||
1331 | ASSERT(BTOBB(need_bytes) < log->l_logBBsize); | |
1332 | ||
28496968 | 1333 | free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); |
2ced19cb DC |
1334 | free_blocks = BTOBBT(free_bytes); |
1335 | ||
1336 | /* | |
1337 | * Set the threshold for the minimum number of free blocks in the | |
1338 | * log to the maximum of what the caller needs, one quarter of the | |
1339 | * log, and 256 blocks. | |
1340 | */ | |
1341 | free_threshold = BTOBB(need_bytes); | |
1342 | free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2)); | |
1343 | free_threshold = MAX(free_threshold, 256); | |
1344 | if (free_blocks >= free_threshold) | |
1345 | return; | |
1346 | ||
1c3cb9ec DC |
1347 | xlog_crack_atomic_lsn(&log->l_tail_lsn, &threshold_cycle, |
1348 | &threshold_block); | |
1349 | threshold_block += free_threshold; | |
1da177e4 | 1350 | if (threshold_block >= log->l_logBBsize) { |
2ced19cb DC |
1351 | threshold_block -= log->l_logBBsize; |
1352 | threshold_cycle += 1; | |
1da177e4 | 1353 | } |
2ced19cb DC |
1354 | threshold_lsn = xlog_assign_lsn(threshold_cycle, |
1355 | threshold_block); | |
1356 | /* | |
1357 | * Don't pass in an lsn greater than the lsn of the last | |
84f3c683 DC |
1358 | * log record known to be on disk. Use a snapshot of the last sync lsn |
1359 | * so that it doesn't change between the compare and the set. | |
1da177e4 | 1360 | */ |
84f3c683 DC |
1361 | last_sync_lsn = atomic64_read(&log->l_last_sync_lsn); |
1362 | if (XFS_LSN_CMP(threshold_lsn, last_sync_lsn) > 0) | |
1363 | threshold_lsn = last_sync_lsn; | |
2ced19cb DC |
1364 | |
1365 | /* | |
1366 | * Get the transaction layer to kick the dirty buffers out to | |
1367 | * disk asynchronously. No point in trying to do this if | |
1368 | * the filesystem is shutting down. | |
1369 | */ | |
1370 | if (!XLOG_FORCED_SHUTDOWN(log)) | |
fd074841 | 1371 | xfs_ail_push(log->l_ailp, threshold_lsn); |
2ced19cb | 1372 | } |
1da177e4 | 1373 | |
873ff550 CH |
1374 | /* |
1375 | * The bdstrat callback function for log bufs. This gives us a central | |
1376 | * place to trap bufs in case we get hit by a log I/O error and need to | |
1377 | * shutdown. Actually, in practice, even when we didn't get a log error, | |
1378 | * we transition the iclogs to IOERROR state *after* flushing all existing | |
1379 | * iclogs to disk. This is because we don't want anymore new transactions to be | |
1380 | * started or completed afterwards. | |
1381 | */ | |
1382 | STATIC int | |
1383 | xlog_bdstrat( | |
1384 | struct xfs_buf *bp) | |
1385 | { | |
adadbeef | 1386 | struct xlog_in_core *iclog = bp->b_fspriv; |
873ff550 | 1387 | |
873ff550 | 1388 | if (iclog->ic_state & XLOG_STATE_IOERROR) { |
5a52c2a5 | 1389 | xfs_buf_ioerror(bp, EIO); |
c867cb61 | 1390 | xfs_buf_stale(bp); |
1a1a3e97 | 1391 | xfs_buf_ioend(bp, 0); |
873ff550 CH |
1392 | /* |
1393 | * It would seem logical to return EIO here, but we rely on | |
1394 | * the log state machine to propagate I/O errors instead of | |
1395 | * doing it here. | |
1396 | */ | |
1397 | return 0; | |
1398 | } | |
1399 | ||
873ff550 CH |
1400 | xfs_buf_iorequest(bp); |
1401 | return 0; | |
1402 | } | |
1da177e4 LT |
1403 | |
1404 | /* | |
1405 | * Flush out the in-core log (iclog) to the on-disk log in an asynchronous | |
1406 | * fashion. Previously, we should have moved the current iclog | |
1407 | * ptr in the log to point to the next available iclog. This allows further | |
1408 | * write to continue while this code syncs out an iclog ready to go. | |
1409 | * Before an in-core log can be written out, the data section must be scanned | |
1410 | * to save away the 1st word of each BBSIZE block into the header. We replace | |
1411 | * it with the current cycle count. Each BBSIZE block is tagged with the | |
1412 | * cycle count because there in an implicit assumption that drives will | |
1413 | * guarantee that entire 512 byte blocks get written at once. In other words, | |
1414 | * we can't have part of a 512 byte block written and part not written. By | |
1415 | * tagging each block, we will know which blocks are valid when recovering | |
1416 | * after an unclean shutdown. | |
1417 | * | |
1418 | * This routine is single threaded on the iclog. No other thread can be in | |
1419 | * this routine with the same iclog. Changing contents of iclog can there- | |
1420 | * fore be done without grabbing the state machine lock. Updating the global | |
1421 | * log will require grabbing the lock though. | |
1422 | * | |
1423 | * The entire log manager uses a logical block numbering scheme. Only | |
1424 | * log_sync (and then only bwrite()) know about the fact that the log may | |
1425 | * not start with block zero on a given device. The log block start offset | |
1426 | * is added immediately before calling bwrite(). | |
1427 | */ | |
1428 | ||
a8272ce0 | 1429 | STATIC int |
1da177e4 LT |
1430 | xlog_sync(xlog_t *log, |
1431 | xlog_in_core_t *iclog) | |
1432 | { | |
1433 | xfs_caddr_t dptr; /* pointer to byte sized element */ | |
1434 | xfs_buf_t *bp; | |
b53e675d | 1435 | int i; |
1da177e4 LT |
1436 | uint count; /* byte count of bwrite */ |
1437 | uint count_init; /* initial count before roundup */ | |
1438 | int roundoff; /* roundoff to BB or stripe */ | |
1439 | int split = 0; /* split write into two regions */ | |
1440 | int error; | |
62118709 | 1441 | int v2 = xfs_sb_version_haslogv2(&log->l_mp->m_sb); |
1da177e4 LT |
1442 | |
1443 | XFS_STATS_INC(xs_log_writes); | |
155cc6b7 | 1444 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 LT |
1445 | |
1446 | /* Add for LR header */ | |
1447 | count_init = log->l_iclog_hsize + iclog->ic_offset; | |
1448 | ||
1449 | /* Round out the log write size */ | |
1450 | if (v2 && log->l_mp->m_sb.sb_logsunit > 1) { | |
1451 | /* we have a v2 stripe unit to use */ | |
1452 | count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); | |
1453 | } else { | |
1454 | count = BBTOB(BTOBB(count_init)); | |
1455 | } | |
1456 | roundoff = count - count_init; | |
1457 | ASSERT(roundoff >= 0); | |
1458 | ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 && | |
1459 | roundoff < log->l_mp->m_sb.sb_logsunit) | |
1460 | || | |
1461 | (log->l_mp->m_sb.sb_logsunit <= 1 && | |
1462 | roundoff < BBTOB(1))); | |
1463 | ||
1464 | /* move grant heads by roundoff in sync */ | |
28496968 CH |
1465 | xlog_grant_add_space(log, &log->l_reserve_head.grant, roundoff); |
1466 | xlog_grant_add_space(log, &log->l_write_head.grant, roundoff); | |
1da177e4 LT |
1467 | |
1468 | /* put cycle number in every block */ | |
1469 | xlog_pack_data(log, iclog, roundoff); | |
1470 | ||
1471 | /* real byte length */ | |
1472 | if (v2) { | |
b53e675d CH |
1473 | iclog->ic_header.h_len = |
1474 | cpu_to_be32(iclog->ic_offset + roundoff); | |
1da177e4 | 1475 | } else { |
b53e675d CH |
1476 | iclog->ic_header.h_len = |
1477 | cpu_to_be32(iclog->ic_offset); | |
1da177e4 LT |
1478 | } |
1479 | ||
f5faad79 | 1480 | bp = iclog->ic_bp; |
b53e675d | 1481 | XFS_BUF_SET_ADDR(bp, BLOCK_LSN(be64_to_cpu(iclog->ic_header.h_lsn))); |
1da177e4 LT |
1482 | |
1483 | XFS_STATS_ADD(xs_log_blocks, BTOBB(count)); | |
1484 | ||
1485 | /* Do we need to split this write into 2 parts? */ | |
1486 | if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) { | |
1487 | split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp))); | |
1488 | count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)); | |
1489 | iclog->ic_bwritecnt = 2; /* split into 2 writes */ | |
1490 | } else { | |
1491 | iclog->ic_bwritecnt = 1; | |
1492 | } | |
511105b3 | 1493 | XFS_BUF_SET_COUNT(bp, count); |
adadbeef | 1494 | bp->b_fspriv = iclog; |
f5faad79 | 1495 | XFS_BUF_ZEROFLAGS(bp); |
1da177e4 | 1496 | XFS_BUF_ASYNC(bp); |
1d5ae5df | 1497 | bp->b_flags |= XBF_SYNCIO; |
651701d7 | 1498 | |
a27a263b | 1499 | if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) { |
e163cbde CH |
1500 | bp->b_flags |= XBF_FUA; |
1501 | ||
a27a263b | 1502 | /* |
e163cbde CH |
1503 | * Flush the data device before flushing the log to make |
1504 | * sure all meta data written back from the AIL actually made | |
1505 | * it to disk before stamping the new log tail LSN into the | |
1506 | * log buffer. For an external log we need to issue the | |
1507 | * flush explicitly, and unfortunately synchronously here; | |
1508 | * for an internal log we can simply use the block layer | |
1509 | * state machine for preflushes. | |
a27a263b CH |
1510 | */ |
1511 | if (log->l_mp->m_logdev_targp != log->l_mp->m_ddev_targp) | |
1512 | xfs_blkdev_issue_flush(log->l_mp->m_ddev_targp); | |
e163cbde CH |
1513 | else |
1514 | bp->b_flags |= XBF_FLUSH; | |
a27a263b | 1515 | } |
1da177e4 LT |
1516 | |
1517 | ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); | |
1518 | ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); | |
1519 | ||
1520 | xlog_verify_iclog(log, iclog, count, B_TRUE); | |
1521 | ||
1522 | /* account for log which doesn't start at block #0 */ | |
1523 | XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); | |
1524 | /* | |
1525 | * Don't call xfs_bwrite here. We do log-syncs even when the filesystem | |
1526 | * is shutting down. | |
1527 | */ | |
1528 | XFS_BUF_WRITE(bp); | |
1529 | ||
901796af CH |
1530 | error = xlog_bdstrat(bp); |
1531 | if (error) { | |
1532 | xfs_buf_ioerror_alert(bp, "xlog_sync"); | |
014c2544 | 1533 | return error; |
1da177e4 LT |
1534 | } |
1535 | if (split) { | |
f5faad79 | 1536 | bp = iclog->ic_log->l_xbuf; |
1da177e4 | 1537 | XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */ |
02fe03d9 CS |
1538 | xfs_buf_associate_memory(bp, |
1539 | (char *)&iclog->ic_header + count, split); | |
adadbeef | 1540 | bp->b_fspriv = iclog; |
f5faad79 | 1541 | XFS_BUF_ZEROFLAGS(bp); |
1da177e4 | 1542 | XFS_BUF_ASYNC(bp); |
1d5ae5df | 1543 | bp->b_flags |= XBF_SYNCIO; |
f538d4da | 1544 | if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) |
e163cbde | 1545 | bp->b_flags |= XBF_FUA; |
62926044 | 1546 | dptr = bp->b_addr; |
1da177e4 LT |
1547 | /* |
1548 | * Bump the cycle numbers at the start of each block | |
1549 | * since this part of the buffer is at the start of | |
1550 | * a new cycle. Watch out for the header magic number | |
1551 | * case, though. | |
1552 | */ | |
b53e675d | 1553 | for (i = 0; i < split; i += BBSIZE) { |
413d57c9 | 1554 | be32_add_cpu((__be32 *)dptr, 1); |
b53e675d | 1555 | if (be32_to_cpu(*(__be32 *)dptr) == XLOG_HEADER_MAGIC_NUM) |
413d57c9 | 1556 | be32_add_cpu((__be32 *)dptr, 1); |
1da177e4 LT |
1557 | dptr += BBSIZE; |
1558 | } | |
1559 | ||
1560 | ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); | |
1561 | ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); | |
1562 | ||
c41564b5 | 1563 | /* account for internal log which doesn't start at block #0 */ |
1da177e4 LT |
1564 | XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); |
1565 | XFS_BUF_WRITE(bp); | |
901796af CH |
1566 | error = xlog_bdstrat(bp); |
1567 | if (error) { | |
1568 | xfs_buf_ioerror_alert(bp, "xlog_sync (split)"); | |
014c2544 | 1569 | return error; |
1da177e4 LT |
1570 | } |
1571 | } | |
014c2544 | 1572 | return 0; |
1da177e4 LT |
1573 | } /* xlog_sync */ |
1574 | ||
1575 | ||
1576 | /* | |
c41564b5 | 1577 | * Deallocate a log structure |
1da177e4 | 1578 | */ |
a8272ce0 | 1579 | STATIC void |
c41564b5 | 1580 | xlog_dealloc_log(xlog_t *log) |
1da177e4 LT |
1581 | { |
1582 | xlog_in_core_t *iclog, *next_iclog; | |
1da177e4 LT |
1583 | int i; |
1584 | ||
71e330b5 DC |
1585 | xlog_cil_destroy(log); |
1586 | ||
44396476 DC |
1587 | /* |
1588 | * always need to ensure that the extra buffer does not point to memory | |
1589 | * owned by another log buffer before we free it. | |
1590 | */ | |
e70b73f8 | 1591 | xfs_buf_set_empty(log->l_xbuf, BTOBB(log->l_iclog_size)); |
44396476 DC |
1592 | xfs_buf_free(log->l_xbuf); |
1593 | ||
1da177e4 LT |
1594 | iclog = log->l_iclog; |
1595 | for (i=0; i<log->l_iclog_bufs; i++) { | |
1da177e4 | 1596 | xfs_buf_free(iclog->ic_bp); |
1da177e4 | 1597 | next_iclog = iclog->ic_next; |
f0e2d93c | 1598 | kmem_free(iclog); |
1da177e4 LT |
1599 | iclog = next_iclog; |
1600 | } | |
1da177e4 | 1601 | spinlock_destroy(&log->l_icloglock); |
1da177e4 | 1602 | |
1da177e4 | 1603 | log->l_mp->m_log = NULL; |
f0e2d93c | 1604 | kmem_free(log); |
c41564b5 | 1605 | } /* xlog_dealloc_log */ |
1da177e4 LT |
1606 | |
1607 | /* | |
1608 | * Update counters atomically now that memcpy is done. | |
1609 | */ | |
1610 | /* ARGSUSED */ | |
1611 | static inline void | |
1612 | xlog_state_finish_copy(xlog_t *log, | |
1613 | xlog_in_core_t *iclog, | |
1614 | int record_cnt, | |
1615 | int copy_bytes) | |
1616 | { | |
b22cd72c | 1617 | spin_lock(&log->l_icloglock); |
1da177e4 | 1618 | |
413d57c9 | 1619 | be32_add_cpu(&iclog->ic_header.h_num_logops, record_cnt); |
1da177e4 LT |
1620 | iclog->ic_offset += copy_bytes; |
1621 | ||
b22cd72c | 1622 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
1623 | } /* xlog_state_finish_copy */ |
1624 | ||
1625 | ||
1626 | ||
1627 | ||
7e9c6396 TS |
1628 | /* |
1629 | * print out info relating to regions written which consume | |
1630 | * the reservation | |
1631 | */ | |
71e330b5 DC |
1632 | void |
1633 | xlog_print_tic_res( | |
1634 | struct xfs_mount *mp, | |
1635 | struct xlog_ticket *ticket) | |
7e9c6396 TS |
1636 | { |
1637 | uint i; | |
1638 | uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); | |
1639 | ||
1640 | /* match with XLOG_REG_TYPE_* in xfs_log.h */ | |
1641 | static char *res_type_str[XLOG_REG_TYPE_MAX] = { | |
1642 | "bformat", | |
1643 | "bchunk", | |
1644 | "efi_format", | |
1645 | "efd_format", | |
1646 | "iformat", | |
1647 | "icore", | |
1648 | "iext", | |
1649 | "ibroot", | |
1650 | "ilocal", | |
1651 | "iattr_ext", | |
1652 | "iattr_broot", | |
1653 | "iattr_local", | |
1654 | "qformat", | |
1655 | "dquot", | |
1656 | "quotaoff", | |
1657 | "LR header", | |
1658 | "unmount", | |
1659 | "commit", | |
1660 | "trans header" | |
1661 | }; | |
1662 | static char *trans_type_str[XFS_TRANS_TYPE_MAX] = { | |
1663 | "SETATTR_NOT_SIZE", | |
1664 | "SETATTR_SIZE", | |
1665 | "INACTIVE", | |
1666 | "CREATE", | |
1667 | "CREATE_TRUNC", | |
1668 | "TRUNCATE_FILE", | |
1669 | "REMOVE", | |
1670 | "LINK", | |
1671 | "RENAME", | |
1672 | "MKDIR", | |
1673 | "RMDIR", | |
1674 | "SYMLINK", | |
1675 | "SET_DMATTRS", | |
1676 | "GROWFS", | |
1677 | "STRAT_WRITE", | |
1678 | "DIOSTRAT", | |
1679 | "WRITE_SYNC", | |
1680 | "WRITEID", | |
1681 | "ADDAFORK", | |
1682 | "ATTRINVAL", | |
1683 | "ATRUNCATE", | |
1684 | "ATTR_SET", | |
1685 | "ATTR_RM", | |
1686 | "ATTR_FLAG", | |
1687 | "CLEAR_AGI_BUCKET", | |
1688 | "QM_SBCHANGE", | |
1689 | "DUMMY1", | |
1690 | "DUMMY2", | |
1691 | "QM_QUOTAOFF", | |
1692 | "QM_DQALLOC", | |
1693 | "QM_SETQLIM", | |
1694 | "QM_DQCLUSTER", | |
1695 | "QM_QINOCREATE", | |
1696 | "QM_QUOTAOFF_END", | |
1697 | "SB_UNIT", | |
1698 | "FSYNC_TS", | |
1699 | "GROWFSRT_ALLOC", | |
1700 | "GROWFSRT_ZERO", | |
1701 | "GROWFSRT_FREE", | |
1702 | "SWAPEXT" | |
1703 | }; | |
1704 | ||
a0fa2b67 | 1705 | xfs_warn(mp, |
93b8a585 | 1706 | "xlog_write: reservation summary:\n" |
a0fa2b67 DC |
1707 | " trans type = %s (%u)\n" |
1708 | " unit res = %d bytes\n" | |
1709 | " current res = %d bytes\n" | |
1710 | " total reg = %u bytes (o/flow = %u bytes)\n" | |
1711 | " ophdrs = %u (ophdr space = %u bytes)\n" | |
1712 | " ophdr + reg = %u bytes\n" | |
1713 | " num regions = %u\n", | |
1714 | ((ticket->t_trans_type <= 0 || | |
1715 | ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ? | |
1716 | "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]), | |
1717 | ticket->t_trans_type, | |
1718 | ticket->t_unit_res, | |
1719 | ticket->t_curr_res, | |
1720 | ticket->t_res_arr_sum, ticket->t_res_o_flow, | |
1721 | ticket->t_res_num_ophdrs, ophdr_spc, | |
1722 | ticket->t_res_arr_sum + | |
1723 | ticket->t_res_o_flow + ophdr_spc, | |
1724 | ticket->t_res_num); | |
7e9c6396 TS |
1725 | |
1726 | for (i = 0; i < ticket->t_res_num; i++) { | |
a0fa2b67 DC |
1727 | uint r_type = ticket->t_res_arr[i].r_type; |
1728 | xfs_warn(mp, "region[%u]: %s - %u bytes\n", i, | |
7e9c6396 TS |
1729 | ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ? |
1730 | "bad-rtype" : res_type_str[r_type-1]), | |
1731 | ticket->t_res_arr[i].r_len); | |
1732 | } | |
169a7b07 | 1733 | |
a0fa2b67 | 1734 | xfs_alert_tag(mp, XFS_PTAG_LOGRES, |
93b8a585 | 1735 | "xlog_write: reservation ran out. Need to up reservation"); |
169a7b07 | 1736 | xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); |
7e9c6396 | 1737 | } |
7e9c6396 | 1738 | |
b5203cd0 DC |
1739 | /* |
1740 | * Calculate the potential space needed by the log vector. Each region gets | |
1741 | * its own xlog_op_header_t and may need to be double word aligned. | |
1742 | */ | |
1743 | static int | |
1744 | xlog_write_calc_vec_length( | |
1745 | struct xlog_ticket *ticket, | |
55b66332 | 1746 | struct xfs_log_vec *log_vector) |
b5203cd0 | 1747 | { |
55b66332 | 1748 | struct xfs_log_vec *lv; |
b5203cd0 DC |
1749 | int headers = 0; |
1750 | int len = 0; | |
1751 | int i; | |
1752 | ||
1753 | /* acct for start rec of xact */ | |
1754 | if (ticket->t_flags & XLOG_TIC_INITED) | |
1755 | headers++; | |
1756 | ||
55b66332 DC |
1757 | for (lv = log_vector; lv; lv = lv->lv_next) { |
1758 | headers += lv->lv_niovecs; | |
1759 | ||
1760 | for (i = 0; i < lv->lv_niovecs; i++) { | |
1761 | struct xfs_log_iovec *vecp = &lv->lv_iovecp[i]; | |
b5203cd0 | 1762 | |
55b66332 DC |
1763 | len += vecp->i_len; |
1764 | xlog_tic_add_region(ticket, vecp->i_len, vecp->i_type); | |
1765 | } | |
b5203cd0 DC |
1766 | } |
1767 | ||
1768 | ticket->t_res_num_ophdrs += headers; | |
1769 | len += headers * sizeof(struct xlog_op_header); | |
1770 | ||
1771 | return len; | |
1772 | } | |
1773 | ||
1774 | /* | |
1775 | * If first write for transaction, insert start record We can't be trying to | |
1776 | * commit if we are inited. We can't have any "partial_copy" if we are inited. | |
1777 | */ | |
1778 | static int | |
1779 | xlog_write_start_rec( | |
e6b1f273 | 1780 | struct xlog_op_header *ophdr, |
b5203cd0 DC |
1781 | struct xlog_ticket *ticket) |
1782 | { | |
b5203cd0 DC |
1783 | if (!(ticket->t_flags & XLOG_TIC_INITED)) |
1784 | return 0; | |
1785 | ||
1786 | ophdr->oh_tid = cpu_to_be32(ticket->t_tid); | |
1787 | ophdr->oh_clientid = ticket->t_clientid; | |
1788 | ophdr->oh_len = 0; | |
1789 | ophdr->oh_flags = XLOG_START_TRANS; | |
1790 | ophdr->oh_res2 = 0; | |
1791 | ||
1792 | ticket->t_flags &= ~XLOG_TIC_INITED; | |
1793 | ||
1794 | return sizeof(struct xlog_op_header); | |
1795 | } | |
1796 | ||
1797 | static xlog_op_header_t * | |
1798 | xlog_write_setup_ophdr( | |
1799 | struct log *log, | |
e6b1f273 | 1800 | struct xlog_op_header *ophdr, |
b5203cd0 DC |
1801 | struct xlog_ticket *ticket, |
1802 | uint flags) | |
1803 | { | |
b5203cd0 DC |
1804 | ophdr->oh_tid = cpu_to_be32(ticket->t_tid); |
1805 | ophdr->oh_clientid = ticket->t_clientid; | |
1806 | ophdr->oh_res2 = 0; | |
1807 | ||
1808 | /* are we copying a commit or unmount record? */ | |
1809 | ophdr->oh_flags = flags; | |
1810 | ||
1811 | /* | |
1812 | * We've seen logs corrupted with bad transaction client ids. This | |
1813 | * makes sure that XFS doesn't generate them on. Turn this into an EIO | |
1814 | * and shut down the filesystem. | |
1815 | */ | |
1816 | switch (ophdr->oh_clientid) { | |
1817 | case XFS_TRANSACTION: | |
1818 | case XFS_VOLUME: | |
1819 | case XFS_LOG: | |
1820 | break; | |
1821 | default: | |
a0fa2b67 | 1822 | xfs_warn(log->l_mp, |
b5203cd0 DC |
1823 | "Bad XFS transaction clientid 0x%x in ticket 0x%p", |
1824 | ophdr->oh_clientid, ticket); | |
1825 | return NULL; | |
1826 | } | |
1827 | ||
1828 | return ophdr; | |
1829 | } | |
1830 | ||
1831 | /* | |
1832 | * Set up the parameters of the region copy into the log. This has | |
1833 | * to handle region write split across multiple log buffers - this | |
1834 | * state is kept external to this function so that this code can | |
1835 | * can be written in an obvious, self documenting manner. | |
1836 | */ | |
1837 | static int | |
1838 | xlog_write_setup_copy( | |
1839 | struct xlog_ticket *ticket, | |
1840 | struct xlog_op_header *ophdr, | |
1841 | int space_available, | |
1842 | int space_required, | |
1843 | int *copy_off, | |
1844 | int *copy_len, | |
1845 | int *last_was_partial_copy, | |
1846 | int *bytes_consumed) | |
1847 | { | |
1848 | int still_to_copy; | |
1849 | ||
1850 | still_to_copy = space_required - *bytes_consumed; | |
1851 | *copy_off = *bytes_consumed; | |
1852 | ||
1853 | if (still_to_copy <= space_available) { | |
1854 | /* write of region completes here */ | |
1855 | *copy_len = still_to_copy; | |
1856 | ophdr->oh_len = cpu_to_be32(*copy_len); | |
1857 | if (*last_was_partial_copy) | |
1858 | ophdr->oh_flags |= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); | |
1859 | *last_was_partial_copy = 0; | |
1860 | *bytes_consumed = 0; | |
1861 | return 0; | |
1862 | } | |
1863 | ||
1864 | /* partial write of region, needs extra log op header reservation */ | |
1865 | *copy_len = space_available; | |
1866 | ophdr->oh_len = cpu_to_be32(*copy_len); | |
1867 | ophdr->oh_flags |= XLOG_CONTINUE_TRANS; | |
1868 | if (*last_was_partial_copy) | |
1869 | ophdr->oh_flags |= XLOG_WAS_CONT_TRANS; | |
1870 | *bytes_consumed += *copy_len; | |
1871 | (*last_was_partial_copy)++; | |
1872 | ||
1873 | /* account for new log op header */ | |
1874 | ticket->t_curr_res -= sizeof(struct xlog_op_header); | |
1875 | ticket->t_res_num_ophdrs++; | |
1876 | ||
1877 | return sizeof(struct xlog_op_header); | |
1878 | } | |
1879 | ||
1880 | static int | |
1881 | xlog_write_copy_finish( | |
1882 | struct log *log, | |
1883 | struct xlog_in_core *iclog, | |
1884 | uint flags, | |
1885 | int *record_cnt, | |
1886 | int *data_cnt, | |
1887 | int *partial_copy, | |
1888 | int *partial_copy_len, | |
1889 | int log_offset, | |
1890 | struct xlog_in_core **commit_iclog) | |
1891 | { | |
1892 | if (*partial_copy) { | |
1893 | /* | |
1894 | * This iclog has already been marked WANT_SYNC by | |
1895 | * xlog_state_get_iclog_space. | |
1896 | */ | |
1897 | xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt); | |
1898 | *record_cnt = 0; | |
1899 | *data_cnt = 0; | |
1900 | return xlog_state_release_iclog(log, iclog); | |
1901 | } | |
1902 | ||
1903 | *partial_copy = 0; | |
1904 | *partial_copy_len = 0; | |
1905 | ||
1906 | if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { | |
1907 | /* no more space in this iclog - push it. */ | |
1908 | xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt); | |
1909 | *record_cnt = 0; | |
1910 | *data_cnt = 0; | |
1911 | ||
1912 | spin_lock(&log->l_icloglock); | |
1913 | xlog_state_want_sync(log, iclog); | |
1914 | spin_unlock(&log->l_icloglock); | |
1915 | ||
1916 | if (!commit_iclog) | |
1917 | return xlog_state_release_iclog(log, iclog); | |
1918 | ASSERT(flags & XLOG_COMMIT_TRANS); | |
1919 | *commit_iclog = iclog; | |
1920 | } | |
1921 | ||
1922 | return 0; | |
1923 | } | |
1924 | ||
1da177e4 LT |
1925 | /* |
1926 | * Write some region out to in-core log | |
1927 | * | |
1928 | * This will be called when writing externally provided regions or when | |
1929 | * writing out a commit record for a given transaction. | |
1930 | * | |
1931 | * General algorithm: | |
1932 | * 1. Find total length of this write. This may include adding to the | |
1933 | * lengths passed in. | |
1934 | * 2. Check whether we violate the tickets reservation. | |
1935 | * 3. While writing to this iclog | |
1936 | * A. Reserve as much space in this iclog as can get | |
1937 | * B. If this is first write, save away start lsn | |
1938 | * C. While writing this region: | |
1939 | * 1. If first write of transaction, write start record | |
1940 | * 2. Write log operation header (header per region) | |
1941 | * 3. Find out if we can fit entire region into this iclog | |
1942 | * 4. Potentially, verify destination memcpy ptr | |
1943 | * 5. Memcpy (partial) region | |
1944 | * 6. If partial copy, release iclog; otherwise, continue | |
1945 | * copying more regions into current iclog | |
1946 | * 4. Mark want sync bit (in simulation mode) | |
1947 | * 5. Release iclog for potential flush to on-disk log. | |
1948 | * | |
1949 | * ERRORS: | |
1950 | * 1. Panic if reservation is overrun. This should never happen since | |
1951 | * reservation amounts are generated internal to the filesystem. | |
1952 | * NOTES: | |
1953 | * 1. Tickets are single threaded data structures. | |
1954 | * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the | |
1955 | * syncing routine. When a single log_write region needs to span | |
1956 | * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set | |
1957 | * on all log operation writes which don't contain the end of the | |
1958 | * region. The XLOG_END_TRANS bit is used for the in-core log | |
1959 | * operation which contains the end of the continued log_write region. | |
1960 | * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog, | |
1961 | * we don't really know exactly how much space will be used. As a result, | |
1962 | * we don't update ic_offset until the end when we know exactly how many | |
1963 | * bytes have been written out. | |
1964 | */ | |
71e330b5 | 1965 | int |
35a8a72f | 1966 | xlog_write( |
55b66332 DC |
1967 | struct log *log, |
1968 | struct xfs_log_vec *log_vector, | |
35a8a72f CH |
1969 | struct xlog_ticket *ticket, |
1970 | xfs_lsn_t *start_lsn, | |
1971 | struct xlog_in_core **commit_iclog, | |
1972 | uint flags) | |
1da177e4 | 1973 | { |
99428ad0 | 1974 | struct xlog_in_core *iclog = NULL; |
55b66332 DC |
1975 | struct xfs_log_iovec *vecp; |
1976 | struct xfs_log_vec *lv; | |
99428ad0 CH |
1977 | int len; |
1978 | int index; | |
1979 | int partial_copy = 0; | |
1980 | int partial_copy_len = 0; | |
1981 | int contwr = 0; | |
1982 | int record_cnt = 0; | |
1983 | int data_cnt = 0; | |
1984 | int error; | |
1985 | ||
1986 | *start_lsn = 0; | |
1987 | ||
55b66332 | 1988 | len = xlog_write_calc_vec_length(ticket, log_vector); |
71e330b5 | 1989 | |
93b8a585 CH |
1990 | /* |
1991 | * Region headers and bytes are already accounted for. | |
1992 | * We only need to take into account start records and | |
1993 | * split regions in this function. | |
1994 | */ | |
1995 | if (ticket->t_flags & XLOG_TIC_INITED) | |
1996 | ticket->t_curr_res -= sizeof(xlog_op_header_t); | |
1997 | ||
1998 | /* | |
1999 | * Commit record headers need to be accounted for. These | |
2000 | * come in as separate writes so are easy to detect. | |
2001 | */ | |
2002 | if (flags & (XLOG_COMMIT_TRANS | XLOG_UNMOUNT_TRANS)) | |
2003 | ticket->t_curr_res -= sizeof(xlog_op_header_t); | |
71e330b5 DC |
2004 | |
2005 | if (ticket->t_curr_res < 0) | |
55b66332 | 2006 | xlog_print_tic_res(log->l_mp, ticket); |
1da177e4 | 2007 | |
55b66332 DC |
2008 | index = 0; |
2009 | lv = log_vector; | |
2010 | vecp = lv->lv_iovecp; | |
2011 | while (lv && index < lv->lv_niovecs) { | |
e6b1f273 | 2012 | void *ptr; |
99428ad0 | 2013 | int log_offset; |
1da177e4 | 2014 | |
99428ad0 CH |
2015 | error = xlog_state_get_iclog_space(log, len, &iclog, ticket, |
2016 | &contwr, &log_offset); | |
2017 | if (error) | |
2018 | return error; | |
1da177e4 | 2019 | |
99428ad0 | 2020 | ASSERT(log_offset <= iclog->ic_size - 1); |
e6b1f273 | 2021 | ptr = iclog->ic_datap + log_offset; |
1da177e4 | 2022 | |
99428ad0 CH |
2023 | /* start_lsn is the first lsn written to. That's all we need. */ |
2024 | if (!*start_lsn) | |
2025 | *start_lsn = be64_to_cpu(iclog->ic_header.h_lsn); | |
b5203cd0 | 2026 | |
99428ad0 CH |
2027 | /* |
2028 | * This loop writes out as many regions as can fit in the amount | |
2029 | * of space which was allocated by xlog_state_get_iclog_space(). | |
2030 | */ | |
55b66332 DC |
2031 | while (lv && index < lv->lv_niovecs) { |
2032 | struct xfs_log_iovec *reg = &vecp[index]; | |
99428ad0 CH |
2033 | struct xlog_op_header *ophdr; |
2034 | int start_rec_copy; | |
2035 | int copy_len; | |
2036 | int copy_off; | |
2037 | ||
55b66332 | 2038 | ASSERT(reg->i_len % sizeof(__int32_t) == 0); |
e6b1f273 | 2039 | ASSERT((unsigned long)ptr % sizeof(__int32_t) == 0); |
99428ad0 CH |
2040 | |
2041 | start_rec_copy = xlog_write_start_rec(ptr, ticket); | |
2042 | if (start_rec_copy) { | |
2043 | record_cnt++; | |
e6b1f273 | 2044 | xlog_write_adv_cnt(&ptr, &len, &log_offset, |
99428ad0 CH |
2045 | start_rec_copy); |
2046 | } | |
b5203cd0 | 2047 | |
99428ad0 CH |
2048 | ophdr = xlog_write_setup_ophdr(log, ptr, ticket, flags); |
2049 | if (!ophdr) | |
2050 | return XFS_ERROR(EIO); | |
2051 | ||
e6b1f273 | 2052 | xlog_write_adv_cnt(&ptr, &len, &log_offset, |
99428ad0 CH |
2053 | sizeof(struct xlog_op_header)); |
2054 | ||
2055 | len += xlog_write_setup_copy(ticket, ophdr, | |
2056 | iclog->ic_size-log_offset, | |
55b66332 | 2057 | reg->i_len, |
99428ad0 CH |
2058 | ©_off, ©_len, |
2059 | &partial_copy, | |
2060 | &partial_copy_len); | |
2061 | xlog_verify_dest_ptr(log, ptr); | |
2062 | ||
2063 | /* copy region */ | |
2064 | ASSERT(copy_len >= 0); | |
e6b1f273 CH |
2065 | memcpy(ptr, reg->i_addr + copy_off, copy_len); |
2066 | xlog_write_adv_cnt(&ptr, &len, &log_offset, copy_len); | |
99428ad0 CH |
2067 | |
2068 | copy_len += start_rec_copy + sizeof(xlog_op_header_t); | |
2069 | record_cnt++; | |
2070 | data_cnt += contwr ? copy_len : 0; | |
2071 | ||
2072 | error = xlog_write_copy_finish(log, iclog, flags, | |
2073 | &record_cnt, &data_cnt, | |
2074 | &partial_copy, | |
2075 | &partial_copy_len, | |
2076 | log_offset, | |
2077 | commit_iclog); | |
2078 | if (error) | |
2079 | return error; | |
2080 | ||
2081 | /* | |
2082 | * if we had a partial copy, we need to get more iclog | |
2083 | * space but we don't want to increment the region | |
2084 | * index because there is still more is this region to | |
2085 | * write. | |
2086 | * | |
2087 | * If we completed writing this region, and we flushed | |
2088 | * the iclog (indicated by resetting of the record | |
2089 | * count), then we also need to get more log space. If | |
2090 | * this was the last record, though, we are done and | |
2091 | * can just return. | |
2092 | */ | |
2093 | if (partial_copy) | |
2094 | break; | |
2095 | ||
55b66332 DC |
2096 | if (++index == lv->lv_niovecs) { |
2097 | lv = lv->lv_next; | |
2098 | index = 0; | |
2099 | if (lv) | |
2100 | vecp = lv->lv_iovecp; | |
2101 | } | |
99428ad0 | 2102 | if (record_cnt == 0) { |
55b66332 | 2103 | if (!lv) |
99428ad0 CH |
2104 | return 0; |
2105 | break; | |
2106 | } | |
2107 | } | |
2108 | } | |
2109 | ||
2110 | ASSERT(len == 0); | |
2111 | ||
2112 | xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); | |
2113 | if (!commit_iclog) | |
2114 | return xlog_state_release_iclog(log, iclog); | |
1da177e4 | 2115 | |
1da177e4 LT |
2116 | ASSERT(flags & XLOG_COMMIT_TRANS); |
2117 | *commit_iclog = iclog; | |
2118 | return 0; | |
99428ad0 | 2119 | } |
1da177e4 LT |
2120 | |
2121 | ||
2122 | /***************************************************************************** | |
2123 | * | |
2124 | * State Machine functions | |
2125 | * | |
2126 | ***************************************************************************** | |
2127 | */ | |
2128 | ||
2129 | /* Clean iclogs starting from the head. This ordering must be | |
2130 | * maintained, so an iclog doesn't become ACTIVE beyond one that | |
2131 | * is SYNCING. This is also required to maintain the notion that we use | |
12017faf | 2132 | * a ordered wait queue to hold off would be writers to the log when every |
1da177e4 LT |
2133 | * iclog is trying to sync to disk. |
2134 | * | |
2135 | * State Change: DIRTY -> ACTIVE | |
2136 | */ | |
ba0f32d4 | 2137 | STATIC void |
1da177e4 LT |
2138 | xlog_state_clean_log(xlog_t *log) |
2139 | { | |
2140 | xlog_in_core_t *iclog; | |
2141 | int changed = 0; | |
2142 | ||
2143 | iclog = log->l_iclog; | |
2144 | do { | |
2145 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
2146 | iclog->ic_state = XLOG_STATE_ACTIVE; | |
2147 | iclog->ic_offset = 0; | |
114d23aa | 2148 | ASSERT(iclog->ic_callback == NULL); |
1da177e4 LT |
2149 | /* |
2150 | * If the number of ops in this iclog indicate it just | |
2151 | * contains the dummy transaction, we can | |
2152 | * change state into IDLE (the second time around). | |
2153 | * Otherwise we should change the state into | |
2154 | * NEED a dummy. | |
2155 | * We don't need to cover the dummy. | |
2156 | */ | |
2157 | if (!changed && | |
b53e675d CH |
2158 | (be32_to_cpu(iclog->ic_header.h_num_logops) == |
2159 | XLOG_COVER_OPS)) { | |
1da177e4 LT |
2160 | changed = 1; |
2161 | } else { | |
2162 | /* | |
2163 | * We have two dirty iclogs so start over | |
2164 | * This could also be num of ops indicates | |
2165 | * this is not the dummy going out. | |
2166 | */ | |
2167 | changed = 2; | |
2168 | } | |
2169 | iclog->ic_header.h_num_logops = 0; | |
2170 | memset(iclog->ic_header.h_cycle_data, 0, | |
2171 | sizeof(iclog->ic_header.h_cycle_data)); | |
2172 | iclog->ic_header.h_lsn = 0; | |
2173 | } else if (iclog->ic_state == XLOG_STATE_ACTIVE) | |
2174 | /* do nothing */; | |
2175 | else | |
2176 | break; /* stop cleaning */ | |
2177 | iclog = iclog->ic_next; | |
2178 | } while (iclog != log->l_iclog); | |
2179 | ||
2180 | /* log is locked when we are called */ | |
2181 | /* | |
2182 | * Change state for the dummy log recording. | |
2183 | * We usually go to NEED. But we go to NEED2 if the changed indicates | |
2184 | * we are done writing the dummy record. | |
2185 | * If we are done with the second dummy recored (DONE2), then | |
2186 | * we go to IDLE. | |
2187 | */ | |
2188 | if (changed) { | |
2189 | switch (log->l_covered_state) { | |
2190 | case XLOG_STATE_COVER_IDLE: | |
2191 | case XLOG_STATE_COVER_NEED: | |
2192 | case XLOG_STATE_COVER_NEED2: | |
2193 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2194 | break; | |
2195 | ||
2196 | case XLOG_STATE_COVER_DONE: | |
2197 | if (changed == 1) | |
2198 | log->l_covered_state = XLOG_STATE_COVER_NEED2; | |
2199 | else | |
2200 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2201 | break; | |
2202 | ||
2203 | case XLOG_STATE_COVER_DONE2: | |
2204 | if (changed == 1) | |
2205 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
2206 | else | |
2207 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2208 | break; | |
2209 | ||
2210 | default: | |
2211 | ASSERT(0); | |
2212 | } | |
2213 | } | |
2214 | } /* xlog_state_clean_log */ | |
2215 | ||
2216 | STATIC xfs_lsn_t | |
2217 | xlog_get_lowest_lsn( | |
2218 | xlog_t *log) | |
2219 | { | |
2220 | xlog_in_core_t *lsn_log; | |
2221 | xfs_lsn_t lowest_lsn, lsn; | |
2222 | ||
2223 | lsn_log = log->l_iclog; | |
2224 | lowest_lsn = 0; | |
2225 | do { | |
2226 | if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) { | |
b53e675d | 2227 | lsn = be64_to_cpu(lsn_log->ic_header.h_lsn); |
1da177e4 LT |
2228 | if ((lsn && !lowest_lsn) || |
2229 | (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) { | |
2230 | lowest_lsn = lsn; | |
2231 | } | |
2232 | } | |
2233 | lsn_log = lsn_log->ic_next; | |
2234 | } while (lsn_log != log->l_iclog); | |
014c2544 | 2235 | return lowest_lsn; |
1da177e4 LT |
2236 | } |
2237 | ||
2238 | ||
2239 | STATIC void | |
2240 | xlog_state_do_callback( | |
2241 | xlog_t *log, | |
2242 | int aborted, | |
2243 | xlog_in_core_t *ciclog) | |
2244 | { | |
2245 | xlog_in_core_t *iclog; | |
2246 | xlog_in_core_t *first_iclog; /* used to know when we've | |
2247 | * processed all iclogs once */ | |
2248 | xfs_log_callback_t *cb, *cb_next; | |
2249 | int flushcnt = 0; | |
2250 | xfs_lsn_t lowest_lsn; | |
2251 | int ioerrors; /* counter: iclogs with errors */ | |
2252 | int loopdidcallbacks; /* flag: inner loop did callbacks*/ | |
2253 | int funcdidcallbacks; /* flag: function did callbacks */ | |
2254 | int repeats; /* for issuing console warnings if | |
2255 | * looping too many times */ | |
d748c623 | 2256 | int wake = 0; |
1da177e4 | 2257 | |
b22cd72c | 2258 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2259 | first_iclog = iclog = log->l_iclog; |
2260 | ioerrors = 0; | |
2261 | funcdidcallbacks = 0; | |
2262 | repeats = 0; | |
2263 | ||
2264 | do { | |
2265 | /* | |
2266 | * Scan all iclogs starting with the one pointed to by the | |
2267 | * log. Reset this starting point each time the log is | |
2268 | * unlocked (during callbacks). | |
2269 | * | |
2270 | * Keep looping through iclogs until one full pass is made | |
2271 | * without running any callbacks. | |
2272 | */ | |
2273 | first_iclog = log->l_iclog; | |
2274 | iclog = log->l_iclog; | |
2275 | loopdidcallbacks = 0; | |
2276 | repeats++; | |
2277 | ||
2278 | do { | |
2279 | ||
2280 | /* skip all iclogs in the ACTIVE & DIRTY states */ | |
2281 | if (iclog->ic_state & | |
2282 | (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) { | |
2283 | iclog = iclog->ic_next; | |
2284 | continue; | |
2285 | } | |
2286 | ||
2287 | /* | |
2288 | * Between marking a filesystem SHUTDOWN and stopping | |
2289 | * the log, we do flush all iclogs to disk (if there | |
2290 | * wasn't a log I/O error). So, we do want things to | |
2291 | * go smoothly in case of just a SHUTDOWN w/o a | |
2292 | * LOG_IO_ERROR. | |
2293 | */ | |
2294 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
2295 | /* | |
2296 | * Can only perform callbacks in order. Since | |
2297 | * this iclog is not in the DONE_SYNC/ | |
2298 | * DO_CALLBACK state, we skip the rest and | |
2299 | * just try to clean up. If we set our iclog | |
2300 | * to DO_CALLBACK, we will not process it when | |
2301 | * we retry since a previous iclog is in the | |
2302 | * CALLBACK and the state cannot change since | |
b22cd72c | 2303 | * we are holding the l_icloglock. |
1da177e4 LT |
2304 | */ |
2305 | if (!(iclog->ic_state & | |
2306 | (XLOG_STATE_DONE_SYNC | | |
2307 | XLOG_STATE_DO_CALLBACK))) { | |
2308 | if (ciclog && (ciclog->ic_state == | |
2309 | XLOG_STATE_DONE_SYNC)) { | |
2310 | ciclog->ic_state = XLOG_STATE_DO_CALLBACK; | |
2311 | } | |
2312 | break; | |
2313 | } | |
2314 | /* | |
2315 | * We now have an iclog that is in either the | |
2316 | * DO_CALLBACK or DONE_SYNC states. The other | |
2317 | * states (WANT_SYNC, SYNCING, or CALLBACK were | |
2318 | * caught by the above if and are going to | |
2319 | * clean (i.e. we aren't doing their callbacks) | |
2320 | * see the above if. | |
2321 | */ | |
2322 | ||
2323 | /* | |
2324 | * We will do one more check here to see if we | |
2325 | * have chased our tail around. | |
2326 | */ | |
2327 | ||
2328 | lowest_lsn = xlog_get_lowest_lsn(log); | |
b53e675d CH |
2329 | if (lowest_lsn && |
2330 | XFS_LSN_CMP(lowest_lsn, | |
84f3c683 | 2331 | be64_to_cpu(iclog->ic_header.h_lsn)) < 0) { |
1da177e4 LT |
2332 | iclog = iclog->ic_next; |
2333 | continue; /* Leave this iclog for | |
2334 | * another thread */ | |
2335 | } | |
2336 | ||
2337 | iclog->ic_state = XLOG_STATE_CALLBACK; | |
2338 | ||
1da177e4 | 2339 | |
84f3c683 DC |
2340 | /* |
2341 | * update the last_sync_lsn before we drop the | |
2342 | * icloglock to ensure we are the only one that | |
2343 | * can update it. | |
1da177e4 | 2344 | */ |
84f3c683 DC |
2345 | ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn), |
2346 | be64_to_cpu(iclog->ic_header.h_lsn)) <= 0); | |
2347 | atomic64_set(&log->l_last_sync_lsn, | |
2348 | be64_to_cpu(iclog->ic_header.h_lsn)); | |
1da177e4 | 2349 | |
84f3c683 | 2350 | } else |
1da177e4 | 2351 | ioerrors++; |
84f3c683 DC |
2352 | |
2353 | spin_unlock(&log->l_icloglock); | |
1da177e4 | 2354 | |
114d23aa DC |
2355 | /* |
2356 | * Keep processing entries in the callback list until | |
2357 | * we come around and it is empty. We need to | |
2358 | * atomically see that the list is empty and change the | |
2359 | * state to DIRTY so that we don't miss any more | |
2360 | * callbacks being added. | |
2361 | */ | |
2362 | spin_lock(&iclog->ic_callback_lock); | |
2363 | cb = iclog->ic_callback; | |
4b80916b | 2364 | while (cb) { |
1da177e4 LT |
2365 | iclog->ic_callback_tail = &(iclog->ic_callback); |
2366 | iclog->ic_callback = NULL; | |
114d23aa | 2367 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 LT |
2368 | |
2369 | /* perform callbacks in the order given */ | |
4b80916b | 2370 | for (; cb; cb = cb_next) { |
1da177e4 LT |
2371 | cb_next = cb->cb_next; |
2372 | cb->cb_func(cb->cb_arg, aborted); | |
2373 | } | |
114d23aa | 2374 | spin_lock(&iclog->ic_callback_lock); |
1da177e4 LT |
2375 | cb = iclog->ic_callback; |
2376 | } | |
2377 | ||
2378 | loopdidcallbacks++; | |
2379 | funcdidcallbacks++; | |
2380 | ||
114d23aa | 2381 | spin_lock(&log->l_icloglock); |
4b80916b | 2382 | ASSERT(iclog->ic_callback == NULL); |
114d23aa | 2383 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 LT |
2384 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) |
2385 | iclog->ic_state = XLOG_STATE_DIRTY; | |
2386 | ||
2387 | /* | |
2388 | * Transition from DIRTY to ACTIVE if applicable. | |
2389 | * NOP if STATE_IOERROR. | |
2390 | */ | |
2391 | xlog_state_clean_log(log); | |
2392 | ||
2393 | /* wake up threads waiting in xfs_log_force() */ | |
eb40a875 | 2394 | wake_up_all(&iclog->ic_force_wait); |
1da177e4 LT |
2395 | |
2396 | iclog = iclog->ic_next; | |
2397 | } while (first_iclog != iclog); | |
a3c6685e NS |
2398 | |
2399 | if (repeats > 5000) { | |
2400 | flushcnt += repeats; | |
2401 | repeats = 0; | |
a0fa2b67 | 2402 | xfs_warn(log->l_mp, |
a3c6685e | 2403 | "%s: possible infinite loop (%d iterations)", |
34a622b2 | 2404 | __func__, flushcnt); |
1da177e4 LT |
2405 | } |
2406 | } while (!ioerrors && loopdidcallbacks); | |
2407 | ||
2408 | /* | |
2409 | * make one last gasp attempt to see if iclogs are being left in | |
2410 | * limbo.. | |
2411 | */ | |
2412 | #ifdef DEBUG | |
2413 | if (funcdidcallbacks) { | |
2414 | first_iclog = iclog = log->l_iclog; | |
2415 | do { | |
2416 | ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); | |
2417 | /* | |
2418 | * Terminate the loop if iclogs are found in states | |
2419 | * which will cause other threads to clean up iclogs. | |
2420 | * | |
2421 | * SYNCING - i/o completion will go through logs | |
2422 | * DONE_SYNC - interrupt thread should be waiting for | |
b22cd72c | 2423 | * l_icloglock |
1da177e4 LT |
2424 | * IOERROR - give up hope all ye who enter here |
2425 | */ | |
2426 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC || | |
2427 | iclog->ic_state == XLOG_STATE_SYNCING || | |
2428 | iclog->ic_state == XLOG_STATE_DONE_SYNC || | |
2429 | iclog->ic_state == XLOG_STATE_IOERROR ) | |
2430 | break; | |
2431 | iclog = iclog->ic_next; | |
2432 | } while (first_iclog != iclog); | |
2433 | } | |
2434 | #endif | |
2435 | ||
d748c623 MW |
2436 | if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) |
2437 | wake = 1; | |
b22cd72c | 2438 | spin_unlock(&log->l_icloglock); |
d748c623 MW |
2439 | |
2440 | if (wake) | |
eb40a875 | 2441 | wake_up_all(&log->l_flush_wait); |
d748c623 | 2442 | } |
1da177e4 LT |
2443 | |
2444 | ||
2445 | /* | |
2446 | * Finish transitioning this iclog to the dirty state. | |
2447 | * | |
2448 | * Make sure that we completely execute this routine only when this is | |
2449 | * the last call to the iclog. There is a good chance that iclog flushes, | |
2450 | * when we reach the end of the physical log, get turned into 2 separate | |
2451 | * calls to bwrite. Hence, one iclog flush could generate two calls to this | |
2452 | * routine. By using the reference count bwritecnt, we guarantee that only | |
2453 | * the second completion goes through. | |
2454 | * | |
2455 | * Callbacks could take time, so they are done outside the scope of the | |
12017faf | 2456 | * global state machine log lock. |
1da177e4 | 2457 | */ |
a8272ce0 | 2458 | STATIC void |
1da177e4 LT |
2459 | xlog_state_done_syncing( |
2460 | xlog_in_core_t *iclog, | |
2461 | int aborted) | |
2462 | { | |
2463 | xlog_t *log = iclog->ic_log; | |
1da177e4 | 2464 | |
b22cd72c | 2465 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2466 | |
2467 | ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || | |
2468 | iclog->ic_state == XLOG_STATE_IOERROR); | |
155cc6b7 | 2469 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 LT |
2470 | ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2); |
2471 | ||
2472 | ||
2473 | /* | |
2474 | * If we got an error, either on the first buffer, or in the case of | |
2475 | * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, | |
2476 | * and none should ever be attempted to be written to disk | |
2477 | * again. | |
2478 | */ | |
2479 | if (iclog->ic_state != XLOG_STATE_IOERROR) { | |
2480 | if (--iclog->ic_bwritecnt == 1) { | |
b22cd72c | 2481 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2482 | return; |
2483 | } | |
2484 | iclog->ic_state = XLOG_STATE_DONE_SYNC; | |
2485 | } | |
2486 | ||
2487 | /* | |
2488 | * Someone could be sleeping prior to writing out the next | |
2489 | * iclog buffer, we wake them all, one will get to do the | |
2490 | * I/O, the others get to wait for the result. | |
2491 | */ | |
eb40a875 | 2492 | wake_up_all(&iclog->ic_write_wait); |
b22cd72c | 2493 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2494 | xlog_state_do_callback(log, aborted, iclog); /* also cleans log */ |
2495 | } /* xlog_state_done_syncing */ | |
2496 | ||
2497 | ||
2498 | /* | |
2499 | * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must | |
12017faf DC |
2500 | * sleep. We wait on the flush queue on the head iclog as that should be |
2501 | * the first iclog to complete flushing. Hence if all iclogs are syncing, | |
2502 | * we will wait here and all new writes will sleep until a sync completes. | |
1da177e4 LT |
2503 | * |
2504 | * The in-core logs are used in a circular fashion. They are not used | |
2505 | * out-of-order even when an iclog past the head is free. | |
2506 | * | |
2507 | * return: | |
2508 | * * log_offset where xlog_write() can start writing into the in-core | |
2509 | * log's data space. | |
2510 | * * in-core log pointer to which xlog_write() should write. | |
2511 | * * boolean indicating this is a continued write to an in-core log. | |
2512 | * If this is the last write, then the in-core log's offset field | |
2513 | * needs to be incremented, depending on the amount of data which | |
2514 | * is copied. | |
2515 | */ | |
a8272ce0 | 2516 | STATIC int |
1da177e4 LT |
2517 | xlog_state_get_iclog_space(xlog_t *log, |
2518 | int len, | |
2519 | xlog_in_core_t **iclogp, | |
2520 | xlog_ticket_t *ticket, | |
2521 | int *continued_write, | |
2522 | int *logoffsetp) | |
2523 | { | |
1da177e4 LT |
2524 | int log_offset; |
2525 | xlog_rec_header_t *head; | |
2526 | xlog_in_core_t *iclog; | |
2527 | int error; | |
2528 | ||
2529 | restart: | |
b22cd72c | 2530 | spin_lock(&log->l_icloglock); |
1da177e4 | 2531 | if (XLOG_FORCED_SHUTDOWN(log)) { |
b22cd72c | 2532 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2533 | return XFS_ERROR(EIO); |
2534 | } | |
2535 | ||
2536 | iclog = log->l_iclog; | |
d748c623 | 2537 | if (iclog->ic_state != XLOG_STATE_ACTIVE) { |
1da177e4 | 2538 | XFS_STATS_INC(xs_log_noiclogs); |
d748c623 MW |
2539 | |
2540 | /* Wait for log writes to have flushed */ | |
eb40a875 | 2541 | xlog_wait(&log->l_flush_wait, &log->l_icloglock); |
1da177e4 LT |
2542 | goto restart; |
2543 | } | |
d748c623 | 2544 | |
1da177e4 LT |
2545 | head = &iclog->ic_header; |
2546 | ||
155cc6b7 | 2547 | atomic_inc(&iclog->ic_refcnt); /* prevents sync */ |
1da177e4 LT |
2548 | log_offset = iclog->ic_offset; |
2549 | ||
2550 | /* On the 1st write to an iclog, figure out lsn. This works | |
2551 | * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are | |
2552 | * committing to. If the offset is set, that's how many blocks | |
2553 | * must be written. | |
2554 | */ | |
2555 | if (log_offset == 0) { | |
2556 | ticket->t_curr_res -= log->l_iclog_hsize; | |
0adba536 | 2557 | xlog_tic_add_region(ticket, |
7e9c6396 TS |
2558 | log->l_iclog_hsize, |
2559 | XLOG_REG_TYPE_LRHEADER); | |
b53e675d CH |
2560 | head->h_cycle = cpu_to_be32(log->l_curr_cycle); |
2561 | head->h_lsn = cpu_to_be64( | |
03bea6fe | 2562 | xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block)); |
1da177e4 LT |
2563 | ASSERT(log->l_curr_block >= 0); |
2564 | } | |
2565 | ||
2566 | /* If there is enough room to write everything, then do it. Otherwise, | |
2567 | * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC | |
2568 | * bit is on, so this will get flushed out. Don't update ic_offset | |
2569 | * until you know exactly how many bytes get copied. Therefore, wait | |
2570 | * until later to update ic_offset. | |
2571 | * | |
2572 | * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's | |
2573 | * can fit into remaining data section. | |
2574 | */ | |
2575 | if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { | |
2576 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2577 | ||
49641f1a DC |
2578 | /* |
2579 | * If I'm the only one writing to this iclog, sync it to disk. | |
2580 | * We need to do an atomic compare and decrement here to avoid | |
2581 | * racing with concurrent atomic_dec_and_lock() calls in | |
2582 | * xlog_state_release_iclog() when there is more than one | |
2583 | * reference to the iclog. | |
2584 | */ | |
2585 | if (!atomic_add_unless(&iclog->ic_refcnt, -1, 1)) { | |
2586 | /* we are the only one */ | |
b22cd72c | 2587 | spin_unlock(&log->l_icloglock); |
49641f1a DC |
2588 | error = xlog_state_release_iclog(log, iclog); |
2589 | if (error) | |
014c2544 | 2590 | return error; |
1da177e4 | 2591 | } else { |
b22cd72c | 2592 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2593 | } |
2594 | goto restart; | |
2595 | } | |
2596 | ||
2597 | /* Do we have enough room to write the full amount in the remainder | |
2598 | * of this iclog? Or must we continue a write on the next iclog and | |
2599 | * mark this iclog as completely taken? In the case where we switch | |
2600 | * iclogs (to mark it taken), this particular iclog will release/sync | |
2601 | * to disk in xlog_write(). | |
2602 | */ | |
2603 | if (len <= iclog->ic_size - iclog->ic_offset) { | |
2604 | *continued_write = 0; | |
2605 | iclog->ic_offset += len; | |
2606 | } else { | |
2607 | *continued_write = 1; | |
2608 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2609 | } | |
2610 | *iclogp = iclog; | |
2611 | ||
2612 | ASSERT(iclog->ic_offset <= iclog->ic_size); | |
b22cd72c | 2613 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2614 | |
2615 | *logoffsetp = log_offset; | |
2616 | return 0; | |
2617 | } /* xlog_state_get_iclog_space */ | |
2618 | ||
1da177e4 LT |
2619 | /* The first cnt-1 times through here we don't need to |
2620 | * move the grant write head because the permanent | |
2621 | * reservation has reserved cnt times the unit amount. | |
2622 | * Release part of current permanent unit reservation and | |
2623 | * reset current reservation to be one units worth. Also | |
2624 | * move grant reservation head forward. | |
2625 | */ | |
2626 | STATIC void | |
2627 | xlog_regrant_reserve_log_space(xlog_t *log, | |
2628 | xlog_ticket_t *ticket) | |
2629 | { | |
0b1b213f CH |
2630 | trace_xfs_log_regrant_reserve_enter(log, ticket); |
2631 | ||
1da177e4 LT |
2632 | if (ticket->t_cnt > 0) |
2633 | ticket->t_cnt--; | |
2634 | ||
28496968 | 2635 | xlog_grant_sub_space(log, &log->l_reserve_head.grant, |
a69ed03c | 2636 | ticket->t_curr_res); |
28496968 | 2637 | xlog_grant_sub_space(log, &log->l_write_head.grant, |
a69ed03c | 2638 | ticket->t_curr_res); |
1da177e4 | 2639 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 2640 | xlog_tic_reset_res(ticket); |
0b1b213f CH |
2641 | |
2642 | trace_xfs_log_regrant_reserve_sub(log, ticket); | |
2643 | ||
1da177e4 | 2644 | /* just return if we still have some of the pre-reserved space */ |
d0eb2f38 | 2645 | if (ticket->t_cnt > 0) |
1da177e4 | 2646 | return; |
1da177e4 | 2647 | |
28496968 | 2648 | xlog_grant_add_space(log, &log->l_reserve_head.grant, |
a69ed03c | 2649 | ticket->t_unit_res); |
0b1b213f CH |
2650 | |
2651 | trace_xfs_log_regrant_reserve_exit(log, ticket); | |
2652 | ||
1da177e4 | 2653 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 2654 | xlog_tic_reset_res(ticket); |
1da177e4 LT |
2655 | } /* xlog_regrant_reserve_log_space */ |
2656 | ||
2657 | ||
2658 | /* | |
2659 | * Give back the space left from a reservation. | |
2660 | * | |
2661 | * All the information we need to make a correct determination of space left | |
2662 | * is present. For non-permanent reservations, things are quite easy. The | |
2663 | * count should have been decremented to zero. We only need to deal with the | |
2664 | * space remaining in the current reservation part of the ticket. If the | |
2665 | * ticket contains a permanent reservation, there may be left over space which | |
2666 | * needs to be released. A count of N means that N-1 refills of the current | |
2667 | * reservation can be done before we need to ask for more space. The first | |
2668 | * one goes to fill up the first current reservation. Once we run out of | |
2669 | * space, the count will stay at zero and the only space remaining will be | |
2670 | * in the current reservation field. | |
2671 | */ | |
2672 | STATIC void | |
2673 | xlog_ungrant_log_space(xlog_t *log, | |
2674 | xlog_ticket_t *ticket) | |
2675 | { | |
663e496a DC |
2676 | int bytes; |
2677 | ||
1da177e4 LT |
2678 | if (ticket->t_cnt > 0) |
2679 | ticket->t_cnt--; | |
2680 | ||
0b1b213f | 2681 | trace_xfs_log_ungrant_enter(log, ticket); |
0b1b213f | 2682 | trace_xfs_log_ungrant_sub(log, ticket); |
1da177e4 | 2683 | |
663e496a DC |
2684 | /* |
2685 | * If this is a permanent reservation ticket, we may be able to free | |
1da177e4 LT |
2686 | * up more space based on the remaining count. |
2687 | */ | |
663e496a | 2688 | bytes = ticket->t_curr_res; |
1da177e4 LT |
2689 | if (ticket->t_cnt > 0) { |
2690 | ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); | |
663e496a | 2691 | bytes += ticket->t_unit_res*ticket->t_cnt; |
1da177e4 LT |
2692 | } |
2693 | ||
28496968 CH |
2694 | xlog_grant_sub_space(log, &log->l_reserve_head.grant, bytes); |
2695 | xlog_grant_sub_space(log, &log->l_write_head.grant, bytes); | |
663e496a | 2696 | |
0b1b213f CH |
2697 | trace_xfs_log_ungrant_exit(log, ticket); |
2698 | ||
cfb7cdca | 2699 | xfs_log_space_wake(log->l_mp); |
09a423a3 | 2700 | } |
1da177e4 | 2701 | |
1da177e4 LT |
2702 | /* |
2703 | * Flush iclog to disk if this is the last reference to the given iclog and | |
2704 | * the WANT_SYNC bit is set. | |
2705 | * | |
2706 | * When this function is entered, the iclog is not necessarily in the | |
2707 | * WANT_SYNC state. It may be sitting around waiting to get filled. | |
2708 | * | |
2709 | * | |
2710 | */ | |
a8272ce0 | 2711 | STATIC int |
b589334c DC |
2712 | xlog_state_release_iclog( |
2713 | xlog_t *log, | |
2714 | xlog_in_core_t *iclog) | |
1da177e4 | 2715 | { |
1da177e4 LT |
2716 | int sync = 0; /* do we sync? */ |
2717 | ||
155cc6b7 DC |
2718 | if (iclog->ic_state & XLOG_STATE_IOERROR) |
2719 | return XFS_ERROR(EIO); | |
2720 | ||
2721 | ASSERT(atomic_read(&iclog->ic_refcnt) > 0); | |
2722 | if (!atomic_dec_and_lock(&iclog->ic_refcnt, &log->l_icloglock)) | |
2723 | return 0; | |
2724 | ||
1da177e4 | 2725 | if (iclog->ic_state & XLOG_STATE_IOERROR) { |
b22cd72c | 2726 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2727 | return XFS_ERROR(EIO); |
2728 | } | |
1da177e4 LT |
2729 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || |
2730 | iclog->ic_state == XLOG_STATE_WANT_SYNC); | |
2731 | ||
155cc6b7 | 2732 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC) { |
b589334c | 2733 | /* update tail before writing to iclog */ |
1c3cb9ec | 2734 | xfs_lsn_t tail_lsn = xlog_assign_tail_lsn(log->l_mp); |
1da177e4 LT |
2735 | sync++; |
2736 | iclog->ic_state = XLOG_STATE_SYNCING; | |
1c3cb9ec DC |
2737 | iclog->ic_header.h_tail_lsn = cpu_to_be64(tail_lsn); |
2738 | xlog_verify_tail_lsn(log, iclog, tail_lsn); | |
1da177e4 LT |
2739 | /* cycle incremented when incrementing curr_block */ |
2740 | } | |
b22cd72c | 2741 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2742 | |
2743 | /* | |
2744 | * We let the log lock go, so it's possible that we hit a log I/O | |
c41564b5 | 2745 | * error or some other SHUTDOWN condition that marks the iclog |
1da177e4 LT |
2746 | * as XLOG_STATE_IOERROR before the bwrite. However, we know that |
2747 | * this iclog has consistent data, so we ignore IOERROR | |
2748 | * flags after this point. | |
2749 | */ | |
b589334c | 2750 | if (sync) |
1da177e4 | 2751 | return xlog_sync(log, iclog); |
014c2544 | 2752 | return 0; |
1da177e4 LT |
2753 | } /* xlog_state_release_iclog */ |
2754 | ||
2755 | ||
2756 | /* | |
2757 | * This routine will mark the current iclog in the ring as WANT_SYNC | |
2758 | * and move the current iclog pointer to the next iclog in the ring. | |
2759 | * When this routine is called from xlog_state_get_iclog_space(), the | |
2760 | * exact size of the iclog has not yet been determined. All we know is | |
2761 | * that every data block. We have run out of space in this log record. | |
2762 | */ | |
2763 | STATIC void | |
2764 | xlog_state_switch_iclogs(xlog_t *log, | |
2765 | xlog_in_core_t *iclog, | |
2766 | int eventual_size) | |
2767 | { | |
2768 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); | |
2769 | if (!eventual_size) | |
2770 | eventual_size = iclog->ic_offset; | |
2771 | iclog->ic_state = XLOG_STATE_WANT_SYNC; | |
b53e675d | 2772 | iclog->ic_header.h_prev_block = cpu_to_be32(log->l_prev_block); |
1da177e4 LT |
2773 | log->l_prev_block = log->l_curr_block; |
2774 | log->l_prev_cycle = log->l_curr_cycle; | |
2775 | ||
2776 | /* roll log?: ic_offset changed later */ | |
2777 | log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); | |
2778 | ||
2779 | /* Round up to next log-sunit */ | |
62118709 | 2780 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && |
1da177e4 LT |
2781 | log->l_mp->m_sb.sb_logsunit > 1) { |
2782 | __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); | |
2783 | log->l_curr_block = roundup(log->l_curr_block, sunit_bb); | |
2784 | } | |
2785 | ||
2786 | if (log->l_curr_block >= log->l_logBBsize) { | |
2787 | log->l_curr_cycle++; | |
2788 | if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) | |
2789 | log->l_curr_cycle++; | |
2790 | log->l_curr_block -= log->l_logBBsize; | |
2791 | ASSERT(log->l_curr_block >= 0); | |
2792 | } | |
2793 | ASSERT(iclog == log->l_iclog); | |
2794 | log->l_iclog = iclog->ic_next; | |
2795 | } /* xlog_state_switch_iclogs */ | |
2796 | ||
1da177e4 LT |
2797 | /* |
2798 | * Write out all data in the in-core log as of this exact moment in time. | |
2799 | * | |
2800 | * Data may be written to the in-core log during this call. However, | |
2801 | * we don't guarantee this data will be written out. A change from past | |
2802 | * implementation means this routine will *not* write out zero length LRs. | |
2803 | * | |
2804 | * Basically, we try and perform an intelligent scan of the in-core logs. | |
2805 | * If we determine there is no flushable data, we just return. There is no | |
2806 | * flushable data if: | |
2807 | * | |
2808 | * 1. the current iclog is active and has no data; the previous iclog | |
2809 | * is in the active or dirty state. | |
2810 | * 2. the current iclog is drity, and the previous iclog is in the | |
2811 | * active or dirty state. | |
2812 | * | |
12017faf | 2813 | * We may sleep if: |
1da177e4 LT |
2814 | * |
2815 | * 1. the current iclog is not in the active nor dirty state. | |
2816 | * 2. the current iclog dirty, and the previous iclog is not in the | |
2817 | * active nor dirty state. | |
2818 | * 3. the current iclog is active, and there is another thread writing | |
2819 | * to this particular iclog. | |
2820 | * 4. a) the current iclog is active and has no other writers | |
2821 | * b) when we return from flushing out this iclog, it is still | |
2822 | * not in the active nor dirty state. | |
2823 | */ | |
a14a348b CH |
2824 | int |
2825 | _xfs_log_force( | |
2826 | struct xfs_mount *mp, | |
2827 | uint flags, | |
2828 | int *log_flushed) | |
1da177e4 | 2829 | { |
a14a348b CH |
2830 | struct log *log = mp->m_log; |
2831 | struct xlog_in_core *iclog; | |
2832 | xfs_lsn_t lsn; | |
2833 | ||
2834 | XFS_STATS_INC(xs_log_force); | |
1da177e4 | 2835 | |
93b8a585 | 2836 | xlog_cil_force(log); |
71e330b5 | 2837 | |
b22cd72c | 2838 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2839 | |
2840 | iclog = log->l_iclog; | |
2841 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 2842 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2843 | return XFS_ERROR(EIO); |
2844 | } | |
2845 | ||
2846 | /* If the head iclog is not active nor dirty, we just attach | |
2847 | * ourselves to the head and go to sleep. | |
2848 | */ | |
2849 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
2850 | iclog->ic_state == XLOG_STATE_DIRTY) { | |
2851 | /* | |
2852 | * If the head is dirty or (active and empty), then | |
2853 | * we need to look at the previous iclog. If the previous | |
2854 | * iclog is active or dirty we are done. There is nothing | |
2855 | * to sync out. Otherwise, we attach ourselves to the | |
2856 | * previous iclog and go to sleep. | |
2857 | */ | |
2858 | if (iclog->ic_state == XLOG_STATE_DIRTY || | |
155cc6b7 DC |
2859 | (atomic_read(&iclog->ic_refcnt) == 0 |
2860 | && iclog->ic_offset == 0)) { | |
1da177e4 LT |
2861 | iclog = iclog->ic_prev; |
2862 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
2863 | iclog->ic_state == XLOG_STATE_DIRTY) | |
2864 | goto no_sleep; | |
2865 | else | |
2866 | goto maybe_sleep; | |
2867 | } else { | |
155cc6b7 | 2868 | if (atomic_read(&iclog->ic_refcnt) == 0) { |
1da177e4 LT |
2869 | /* We are the only one with access to this |
2870 | * iclog. Flush it out now. There should | |
2871 | * be a roundoff of zero to show that someone | |
2872 | * has already taken care of the roundoff from | |
2873 | * the previous sync. | |
2874 | */ | |
155cc6b7 | 2875 | atomic_inc(&iclog->ic_refcnt); |
b53e675d | 2876 | lsn = be64_to_cpu(iclog->ic_header.h_lsn); |
1da177e4 | 2877 | xlog_state_switch_iclogs(log, iclog, 0); |
b22cd72c | 2878 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2879 | |
2880 | if (xlog_state_release_iclog(log, iclog)) | |
2881 | return XFS_ERROR(EIO); | |
a14a348b CH |
2882 | |
2883 | if (log_flushed) | |
2884 | *log_flushed = 1; | |
b22cd72c | 2885 | spin_lock(&log->l_icloglock); |
b53e675d | 2886 | if (be64_to_cpu(iclog->ic_header.h_lsn) == lsn && |
1da177e4 LT |
2887 | iclog->ic_state != XLOG_STATE_DIRTY) |
2888 | goto maybe_sleep; | |
2889 | else | |
2890 | goto no_sleep; | |
2891 | } else { | |
2892 | /* Someone else is writing to this iclog. | |
2893 | * Use its call to flush out the data. However, | |
2894 | * the other thread may not force out this LR, | |
2895 | * so we mark it WANT_SYNC. | |
2896 | */ | |
2897 | xlog_state_switch_iclogs(log, iclog, 0); | |
2898 | goto maybe_sleep; | |
2899 | } | |
2900 | } | |
2901 | } | |
2902 | ||
2903 | /* By the time we come around again, the iclog could've been filled | |
2904 | * which would give it another lsn. If we have a new lsn, just | |
2905 | * return because the relevant data has been flushed. | |
2906 | */ | |
2907 | maybe_sleep: | |
2908 | if (flags & XFS_LOG_SYNC) { | |
2909 | /* | |
2910 | * We must check if we're shutting down here, before | |
b22cd72c | 2911 | * we wait, while we're holding the l_icloglock. |
1da177e4 LT |
2912 | * Then we check again after waking up, in case our |
2913 | * sleep was disturbed by a bad news. | |
2914 | */ | |
2915 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 2916 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2917 | return XFS_ERROR(EIO); |
2918 | } | |
2919 | XFS_STATS_INC(xs_log_force_sleep); | |
eb40a875 | 2920 | xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); |
1da177e4 LT |
2921 | /* |
2922 | * No need to grab the log lock here since we're | |
2923 | * only deciding whether or not to return EIO | |
2924 | * and the memory read should be atomic. | |
2925 | */ | |
2926 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
2927 | return XFS_ERROR(EIO); | |
a14a348b CH |
2928 | if (log_flushed) |
2929 | *log_flushed = 1; | |
1da177e4 LT |
2930 | } else { |
2931 | ||
2932 | no_sleep: | |
b22cd72c | 2933 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2934 | } |
2935 | return 0; | |
a14a348b | 2936 | } |
1da177e4 | 2937 | |
a14a348b CH |
2938 | /* |
2939 | * Wrapper for _xfs_log_force(), to be used when caller doesn't care | |
2940 | * about errors or whether the log was flushed or not. This is the normal | |
2941 | * interface to use when trying to unpin items or move the log forward. | |
2942 | */ | |
2943 | void | |
2944 | xfs_log_force( | |
2945 | xfs_mount_t *mp, | |
2946 | uint flags) | |
2947 | { | |
2948 | int error; | |
2949 | ||
2950 | error = _xfs_log_force(mp, flags, NULL); | |
a0fa2b67 DC |
2951 | if (error) |
2952 | xfs_warn(mp, "%s: error %d returned.", __func__, error); | |
a14a348b | 2953 | } |
1da177e4 LT |
2954 | |
2955 | /* | |
a14a348b | 2956 | * Force the in-core log to disk for a specific LSN. |
1da177e4 LT |
2957 | * |
2958 | * Find in-core log with lsn. | |
2959 | * If it is in the DIRTY state, just return. | |
2960 | * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC | |
2961 | * state and go to sleep or return. | |
2962 | * If it is in any other state, go to sleep or return. | |
2963 | * | |
a14a348b CH |
2964 | * Synchronous forces are implemented with a signal variable. All callers |
2965 | * to force a given lsn to disk will wait on a the sv attached to the | |
2966 | * specific in-core log. When given in-core log finally completes its | |
2967 | * write to disk, that thread will wake up all threads waiting on the | |
2968 | * sv. | |
1da177e4 | 2969 | */ |
a14a348b CH |
2970 | int |
2971 | _xfs_log_force_lsn( | |
2972 | struct xfs_mount *mp, | |
2973 | xfs_lsn_t lsn, | |
2974 | uint flags, | |
2975 | int *log_flushed) | |
1da177e4 | 2976 | { |
a14a348b CH |
2977 | struct log *log = mp->m_log; |
2978 | struct xlog_in_core *iclog; | |
2979 | int already_slept = 0; | |
1da177e4 | 2980 | |
a14a348b | 2981 | ASSERT(lsn != 0); |
1da177e4 | 2982 | |
a14a348b | 2983 | XFS_STATS_INC(xs_log_force); |
1da177e4 | 2984 | |
93b8a585 CH |
2985 | lsn = xlog_cil_force_lsn(log, lsn); |
2986 | if (lsn == NULLCOMMITLSN) | |
2987 | return 0; | |
71e330b5 | 2988 | |
a14a348b CH |
2989 | try_again: |
2990 | spin_lock(&log->l_icloglock); | |
2991 | iclog = log->l_iclog; | |
2992 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 2993 | spin_unlock(&log->l_icloglock); |
a14a348b | 2994 | return XFS_ERROR(EIO); |
1da177e4 LT |
2995 | } |
2996 | ||
a14a348b CH |
2997 | do { |
2998 | if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) { | |
2999 | iclog = iclog->ic_next; | |
3000 | continue; | |
3001 | } | |
3002 | ||
3003 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
3004 | spin_unlock(&log->l_icloglock); | |
3005 | return 0; | |
3006 | } | |
3007 | ||
3008 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3009 | /* | |
3010 | * We sleep here if we haven't already slept (e.g. | |
3011 | * this is the first time we've looked at the correct | |
3012 | * iclog buf) and the buffer before us is going to | |
3013 | * be sync'ed. The reason for this is that if we | |
3014 | * are doing sync transactions here, by waiting for | |
3015 | * the previous I/O to complete, we can allow a few | |
3016 | * more transactions into this iclog before we close | |
3017 | * it down. | |
3018 | * | |
3019 | * Otherwise, we mark the buffer WANT_SYNC, and bump | |
3020 | * up the refcnt so we can release the log (which | |
3021 | * drops the ref count). The state switch keeps new | |
3022 | * transaction commits from using this buffer. When | |
3023 | * the current commits finish writing into the buffer, | |
3024 | * the refcount will drop to zero and the buffer will | |
3025 | * go out then. | |
3026 | */ | |
3027 | if (!already_slept && | |
3028 | (iclog->ic_prev->ic_state & | |
3029 | (XLOG_STATE_WANT_SYNC | XLOG_STATE_SYNCING))) { | |
3030 | ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); | |
3031 | ||
3032 | XFS_STATS_INC(xs_log_force_sleep); | |
3033 | ||
eb40a875 DC |
3034 | xlog_wait(&iclog->ic_prev->ic_write_wait, |
3035 | &log->l_icloglock); | |
a14a348b CH |
3036 | if (log_flushed) |
3037 | *log_flushed = 1; | |
3038 | already_slept = 1; | |
3039 | goto try_again; | |
3040 | } | |
155cc6b7 | 3041 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 | 3042 | xlog_state_switch_iclogs(log, iclog, 0); |
b22cd72c | 3043 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3044 | if (xlog_state_release_iclog(log, iclog)) |
3045 | return XFS_ERROR(EIO); | |
a14a348b CH |
3046 | if (log_flushed) |
3047 | *log_flushed = 1; | |
b22cd72c | 3048 | spin_lock(&log->l_icloglock); |
1da177e4 | 3049 | } |
1da177e4 | 3050 | |
a14a348b CH |
3051 | if ((flags & XFS_LOG_SYNC) && /* sleep */ |
3052 | !(iclog->ic_state & | |
3053 | (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) { | |
3054 | /* | |
3055 | * Don't wait on completion if we know that we've | |
3056 | * gotten a log write error. | |
3057 | */ | |
3058 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
3059 | spin_unlock(&log->l_icloglock); | |
3060 | return XFS_ERROR(EIO); | |
3061 | } | |
3062 | XFS_STATS_INC(xs_log_force_sleep); | |
eb40a875 | 3063 | xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); |
a14a348b CH |
3064 | /* |
3065 | * No need to grab the log lock here since we're | |
3066 | * only deciding whether or not to return EIO | |
3067 | * and the memory read should be atomic. | |
3068 | */ | |
3069 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
3070 | return XFS_ERROR(EIO); | |
1da177e4 | 3071 | |
a14a348b CH |
3072 | if (log_flushed) |
3073 | *log_flushed = 1; | |
3074 | } else { /* just return */ | |
b22cd72c | 3075 | spin_unlock(&log->l_icloglock); |
1da177e4 | 3076 | } |
1da177e4 | 3077 | |
a14a348b CH |
3078 | return 0; |
3079 | } while (iclog != log->l_iclog); | |
1da177e4 | 3080 | |
a14a348b CH |
3081 | spin_unlock(&log->l_icloglock); |
3082 | return 0; | |
3083 | } | |
3084 | ||
3085 | /* | |
3086 | * Wrapper for _xfs_log_force_lsn(), to be used when caller doesn't care | |
3087 | * about errors or whether the log was flushed or not. This is the normal | |
3088 | * interface to use when trying to unpin items or move the log forward. | |
3089 | */ | |
3090 | void | |
3091 | xfs_log_force_lsn( | |
3092 | xfs_mount_t *mp, | |
3093 | xfs_lsn_t lsn, | |
3094 | uint flags) | |
3095 | { | |
3096 | int error; | |
1da177e4 | 3097 | |
a14a348b | 3098 | error = _xfs_log_force_lsn(mp, lsn, flags, NULL); |
a0fa2b67 DC |
3099 | if (error) |
3100 | xfs_warn(mp, "%s: error %d returned.", __func__, error); | |
a14a348b | 3101 | } |
1da177e4 LT |
3102 | |
3103 | /* | |
3104 | * Called when we want to mark the current iclog as being ready to sync to | |
3105 | * disk. | |
3106 | */ | |
a8272ce0 | 3107 | STATIC void |
1da177e4 LT |
3108 | xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog) |
3109 | { | |
a8914f3a | 3110 | assert_spin_locked(&log->l_icloglock); |
1da177e4 LT |
3111 | |
3112 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3113 | xlog_state_switch_iclogs(log, iclog, 0); | |
3114 | } else { | |
3115 | ASSERT(iclog->ic_state & | |
3116 | (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR)); | |
3117 | } | |
39e2defe | 3118 | } |
1da177e4 LT |
3119 | |
3120 | ||
3121 | /***************************************************************************** | |
3122 | * | |
3123 | * TICKET functions | |
3124 | * | |
3125 | ***************************************************************************** | |
3126 | */ | |
3127 | ||
3128 | /* | |
9da096fd | 3129 | * Free a used ticket when its refcount falls to zero. |
1da177e4 | 3130 | */ |
cc09c0dc DC |
3131 | void |
3132 | xfs_log_ticket_put( | |
3133 | xlog_ticket_t *ticket) | |
1da177e4 | 3134 | { |
cc09c0dc | 3135 | ASSERT(atomic_read(&ticket->t_ref) > 0); |
eb40a875 | 3136 | if (atomic_dec_and_test(&ticket->t_ref)) |
cc09c0dc | 3137 | kmem_zone_free(xfs_log_ticket_zone, ticket); |
cc09c0dc | 3138 | } |
1da177e4 | 3139 | |
cc09c0dc DC |
3140 | xlog_ticket_t * |
3141 | xfs_log_ticket_get( | |
3142 | xlog_ticket_t *ticket) | |
3143 | { | |
3144 | ASSERT(atomic_read(&ticket->t_ref) > 0); | |
3145 | atomic_inc(&ticket->t_ref); | |
3146 | return ticket; | |
3147 | } | |
1da177e4 LT |
3148 | |
3149 | /* | |
eb01c9cd | 3150 | * Allocate and initialise a new log ticket. |
1da177e4 | 3151 | */ |
71e330b5 | 3152 | xlog_ticket_t * |
9b9fc2b7 DC |
3153 | xlog_ticket_alloc( |
3154 | struct log *log, | |
3155 | int unit_bytes, | |
3156 | int cnt, | |
3157 | char client, | |
9006fb91 | 3158 | bool permanent, |
3383ca57 | 3159 | int alloc_flags) |
1da177e4 | 3160 | { |
9b9fc2b7 | 3161 | struct xlog_ticket *tic; |
1da177e4 | 3162 | uint num_headers; |
9b9fc2b7 | 3163 | int iclog_space; |
1da177e4 | 3164 | |
3383ca57 | 3165 | tic = kmem_zone_zalloc(xfs_log_ticket_zone, alloc_flags); |
eb01c9cd DC |
3166 | if (!tic) |
3167 | return NULL; | |
1da177e4 LT |
3168 | |
3169 | /* | |
3170 | * Permanent reservations have up to 'cnt'-1 active log operations | |
3171 | * in the log. A unit in this case is the amount of space for one | |
3172 | * of these log operations. Normal reservations have a cnt of 1 | |
3173 | * and their unit amount is the total amount of space required. | |
3174 | * | |
3175 | * The following lines of code account for non-transaction data | |
32fb9b57 TS |
3176 | * which occupy space in the on-disk log. |
3177 | * | |
3178 | * Normal form of a transaction is: | |
3179 | * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> | |
3180 | * and then there are LR hdrs, split-recs and roundoff at end of syncs. | |
3181 | * | |
3182 | * We need to account for all the leadup data and trailer data | |
3183 | * around the transaction data. | |
3184 | * And then we need to account for the worst case in terms of using | |
3185 | * more space. | |
3186 | * The worst case will happen if: | |
3187 | * - the placement of the transaction happens to be such that the | |
3188 | * roundoff is at its maximum | |
3189 | * - the transaction data is synced before the commit record is synced | |
3190 | * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> | |
3191 | * Therefore the commit record is in its own Log Record. | |
3192 | * This can happen as the commit record is called with its | |
3193 | * own region to xlog_write(). | |
3194 | * This then means that in the worst case, roundoff can happen for | |
3195 | * the commit-rec as well. | |
3196 | * The commit-rec is smaller than padding in this scenario and so it is | |
3197 | * not added separately. | |
1da177e4 LT |
3198 | */ |
3199 | ||
32fb9b57 TS |
3200 | /* for trans header */ |
3201 | unit_bytes += sizeof(xlog_op_header_t); | |
3202 | unit_bytes += sizeof(xfs_trans_header_t); | |
3203 | ||
1da177e4 | 3204 | /* for start-rec */ |
32fb9b57 TS |
3205 | unit_bytes += sizeof(xlog_op_header_t); |
3206 | ||
9b9fc2b7 DC |
3207 | /* |
3208 | * for LR headers - the space for data in an iclog is the size minus | |
3209 | * the space used for the headers. If we use the iclog size, then we | |
3210 | * undercalculate the number of headers required. | |
3211 | * | |
3212 | * Furthermore - the addition of op headers for split-recs might | |
3213 | * increase the space required enough to require more log and op | |
3214 | * headers, so take that into account too. | |
3215 | * | |
3216 | * IMPORTANT: This reservation makes the assumption that if this | |
3217 | * transaction is the first in an iclog and hence has the LR headers | |
3218 | * accounted to it, then the remaining space in the iclog is | |
3219 | * exclusively for this transaction. i.e. if the transaction is larger | |
3220 | * than the iclog, it will be the only thing in that iclog. | |
3221 | * Fundamentally, this means we must pass the entire log vector to | |
3222 | * xlog_write to guarantee this. | |
3223 | */ | |
3224 | iclog_space = log->l_iclog_size - log->l_iclog_hsize; | |
3225 | num_headers = howmany(unit_bytes, iclog_space); | |
3226 | ||
3227 | /* for split-recs - ophdrs added when data split over LRs */ | |
3228 | unit_bytes += sizeof(xlog_op_header_t) * num_headers; | |
3229 | ||
3230 | /* add extra header reservations if we overrun */ | |
3231 | while (!num_headers || | |
3232 | howmany(unit_bytes, iclog_space) > num_headers) { | |
3233 | unit_bytes += sizeof(xlog_op_header_t); | |
3234 | num_headers++; | |
3235 | } | |
32fb9b57 | 3236 | unit_bytes += log->l_iclog_hsize * num_headers; |
1da177e4 | 3237 | |
32fb9b57 TS |
3238 | /* for commit-rec LR header - note: padding will subsume the ophdr */ |
3239 | unit_bytes += log->l_iclog_hsize; | |
3240 | ||
32fb9b57 | 3241 | /* for roundoff padding for transaction data and one for commit record */ |
62118709 | 3242 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && |
32fb9b57 | 3243 | log->l_mp->m_sb.sb_logsunit > 1) { |
1da177e4 | 3244 | /* log su roundoff */ |
32fb9b57 | 3245 | unit_bytes += 2*log->l_mp->m_sb.sb_logsunit; |
1da177e4 LT |
3246 | } else { |
3247 | /* BB roundoff */ | |
32fb9b57 | 3248 | unit_bytes += 2*BBSIZE; |
1da177e4 LT |
3249 | } |
3250 | ||
cc09c0dc | 3251 | atomic_set(&tic->t_ref, 1); |
14a7235f | 3252 | tic->t_task = current; |
10547941 | 3253 | INIT_LIST_HEAD(&tic->t_queue); |
1da177e4 LT |
3254 | tic->t_unit_res = unit_bytes; |
3255 | tic->t_curr_res = unit_bytes; | |
3256 | tic->t_cnt = cnt; | |
3257 | tic->t_ocnt = cnt; | |
f9837107 | 3258 | tic->t_tid = random32(); |
1da177e4 LT |
3259 | tic->t_clientid = client; |
3260 | tic->t_flags = XLOG_TIC_INITED; | |
7e9c6396 | 3261 | tic->t_trans_type = 0; |
9006fb91 | 3262 | if (permanent) |
1da177e4 | 3263 | tic->t_flags |= XLOG_TIC_PERM_RESERV; |
1da177e4 | 3264 | |
0adba536 | 3265 | xlog_tic_reset_res(tic); |
7e9c6396 | 3266 | |
1da177e4 | 3267 | return tic; |
cc09c0dc | 3268 | } |
1da177e4 LT |
3269 | |
3270 | ||
3271 | /****************************************************************************** | |
3272 | * | |
3273 | * Log debug routines | |
3274 | * | |
3275 | ****************************************************************************** | |
3276 | */ | |
cfcbbbd0 | 3277 | #if defined(DEBUG) |
1da177e4 LT |
3278 | /* |
3279 | * Make sure that the destination ptr is within the valid data region of | |
3280 | * one of the iclogs. This uses backup pointers stored in a different | |
3281 | * part of the log in case we trash the log structure. | |
3282 | */ | |
3283 | void | |
e6b1f273 CH |
3284 | xlog_verify_dest_ptr( |
3285 | struct log *log, | |
3286 | char *ptr) | |
1da177e4 LT |
3287 | { |
3288 | int i; | |
3289 | int good_ptr = 0; | |
3290 | ||
e6b1f273 CH |
3291 | for (i = 0; i < log->l_iclog_bufs; i++) { |
3292 | if (ptr >= log->l_iclog_bak[i] && | |
3293 | ptr <= log->l_iclog_bak[i] + log->l_iclog_size) | |
1da177e4 LT |
3294 | good_ptr++; |
3295 | } | |
e6b1f273 CH |
3296 | |
3297 | if (!good_ptr) | |
a0fa2b67 | 3298 | xfs_emerg(log->l_mp, "%s: invalid ptr", __func__); |
e6b1f273 | 3299 | } |
1da177e4 | 3300 | |
da8a1a4a DC |
3301 | /* |
3302 | * Check to make sure the grant write head didn't just over lap the tail. If | |
3303 | * the cycles are the same, we can't be overlapping. Otherwise, make sure that | |
3304 | * the cycles differ by exactly one and check the byte count. | |
3305 | * | |
3306 | * This check is run unlocked, so can give false positives. Rather than assert | |
3307 | * on failures, use a warn-once flag and a panic tag to allow the admin to | |
3308 | * determine if they want to panic the machine when such an error occurs. For | |
3309 | * debug kernels this will have the same effect as using an assert but, unlinke | |
3310 | * an assert, it can be turned off at runtime. | |
3311 | */ | |
3f336c6f DC |
3312 | STATIC void |
3313 | xlog_verify_grant_tail( | |
3314 | struct log *log) | |
3315 | { | |
1c3cb9ec | 3316 | int tail_cycle, tail_blocks; |
a69ed03c | 3317 | int cycle, space; |
3f336c6f | 3318 | |
28496968 | 3319 | xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &space); |
1c3cb9ec DC |
3320 | xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_blocks); |
3321 | if (tail_cycle != cycle) { | |
da8a1a4a DC |
3322 | if (cycle - 1 != tail_cycle && |
3323 | !(log->l_flags & XLOG_TAIL_WARN)) { | |
3324 | xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, | |
3325 | "%s: cycle - 1 != tail_cycle", __func__); | |
3326 | log->l_flags |= XLOG_TAIL_WARN; | |
3327 | } | |
3328 | ||
3329 | if (space > BBTOB(tail_blocks) && | |
3330 | !(log->l_flags & XLOG_TAIL_WARN)) { | |
3331 | xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, | |
3332 | "%s: space > BBTOB(tail_blocks)", __func__); | |
3333 | log->l_flags |= XLOG_TAIL_WARN; | |
3334 | } | |
3f336c6f DC |
3335 | } |
3336 | } | |
3337 | ||
1da177e4 LT |
3338 | /* check if it will fit */ |
3339 | STATIC void | |
3340 | xlog_verify_tail_lsn(xlog_t *log, | |
3341 | xlog_in_core_t *iclog, | |
3342 | xfs_lsn_t tail_lsn) | |
3343 | { | |
3344 | int blocks; | |
3345 | ||
3346 | if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { | |
3347 | blocks = | |
3348 | log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); | |
3349 | if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) | |
a0fa2b67 | 3350 | xfs_emerg(log->l_mp, "%s: ran out of log space", __func__); |
1da177e4 LT |
3351 | } else { |
3352 | ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); | |
3353 | ||
3354 | if (BLOCK_LSN(tail_lsn) == log->l_prev_block) | |
a0fa2b67 | 3355 | xfs_emerg(log->l_mp, "%s: tail wrapped", __func__); |
1da177e4 LT |
3356 | |
3357 | blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; | |
3358 | if (blocks < BTOBB(iclog->ic_offset) + 1) | |
a0fa2b67 | 3359 | xfs_emerg(log->l_mp, "%s: ran out of log space", __func__); |
1da177e4 LT |
3360 | } |
3361 | } /* xlog_verify_tail_lsn */ | |
3362 | ||
3363 | /* | |
3364 | * Perform a number of checks on the iclog before writing to disk. | |
3365 | * | |
3366 | * 1. Make sure the iclogs are still circular | |
3367 | * 2. Make sure we have a good magic number | |
3368 | * 3. Make sure we don't have magic numbers in the data | |
3369 | * 4. Check fields of each log operation header for: | |
3370 | * A. Valid client identifier | |
3371 | * B. tid ptr value falls in valid ptr space (user space code) | |
3372 | * C. Length in log record header is correct according to the | |
3373 | * individual operation headers within record. | |
3374 | * 5. When a bwrite will occur within 5 blocks of the front of the physical | |
3375 | * log, check the preceding blocks of the physical log to make sure all | |
3376 | * the cycle numbers agree with the current cycle number. | |
3377 | */ | |
3378 | STATIC void | |
3379 | xlog_verify_iclog(xlog_t *log, | |
3380 | xlog_in_core_t *iclog, | |
3381 | int count, | |
3382 | boolean_t syncing) | |
3383 | { | |
3384 | xlog_op_header_t *ophead; | |
3385 | xlog_in_core_t *icptr; | |
3386 | xlog_in_core_2_t *xhdr; | |
3387 | xfs_caddr_t ptr; | |
3388 | xfs_caddr_t base_ptr; | |
3389 | __psint_t field_offset; | |
3390 | __uint8_t clientid; | |
3391 | int len, i, j, k, op_len; | |
3392 | int idx; | |
1da177e4 LT |
3393 | |
3394 | /* check validity of iclog pointers */ | |
b22cd72c | 3395 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3396 | icptr = log->l_iclog; |
3397 | for (i=0; i < log->l_iclog_bufs; i++) { | |
4b80916b | 3398 | if (icptr == NULL) |
a0fa2b67 | 3399 | xfs_emerg(log->l_mp, "%s: invalid ptr", __func__); |
1da177e4 LT |
3400 | icptr = icptr->ic_next; |
3401 | } | |
3402 | if (icptr != log->l_iclog) | |
a0fa2b67 | 3403 | xfs_emerg(log->l_mp, "%s: corrupt iclog ring", __func__); |
b22cd72c | 3404 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3405 | |
3406 | /* check log magic numbers */ | |
69ef921b | 3407 | if (iclog->ic_header.h_magicno != cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) |
a0fa2b67 | 3408 | xfs_emerg(log->l_mp, "%s: invalid magic num", __func__); |
1da177e4 | 3409 | |
b53e675d CH |
3410 | ptr = (xfs_caddr_t) &iclog->ic_header; |
3411 | for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&iclog->ic_header) + count; | |
1da177e4 | 3412 | ptr += BBSIZE) { |
69ef921b | 3413 | if (*(__be32 *)ptr == cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) |
a0fa2b67 DC |
3414 | xfs_emerg(log->l_mp, "%s: unexpected magic num", |
3415 | __func__); | |
1da177e4 LT |
3416 | } |
3417 | ||
3418 | /* check fields */ | |
b53e675d | 3419 | len = be32_to_cpu(iclog->ic_header.h_num_logops); |
1da177e4 LT |
3420 | ptr = iclog->ic_datap; |
3421 | base_ptr = ptr; | |
3422 | ophead = (xlog_op_header_t *)ptr; | |
b28708d6 | 3423 | xhdr = iclog->ic_data; |
1da177e4 LT |
3424 | for (i = 0; i < len; i++) { |
3425 | ophead = (xlog_op_header_t *)ptr; | |
3426 | ||
3427 | /* clientid is only 1 byte */ | |
3428 | field_offset = (__psint_t) | |
3429 | ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr); | |
3430 | if (syncing == B_FALSE || (field_offset & 0x1ff)) { | |
3431 | clientid = ophead->oh_clientid; | |
3432 | } else { | |
3433 | idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap); | |
3434 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { | |
3435 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3436 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
03bea6fe CH |
3437 | clientid = xlog_get_client_id( |
3438 | xhdr[j].hic_xheader.xh_cycle_data[k]); | |
1da177e4 | 3439 | } else { |
03bea6fe CH |
3440 | clientid = xlog_get_client_id( |
3441 | iclog->ic_header.h_cycle_data[idx]); | |
1da177e4 LT |
3442 | } |
3443 | } | |
3444 | if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) | |
a0fa2b67 DC |
3445 | xfs_warn(log->l_mp, |
3446 | "%s: invalid clientid %d op 0x%p offset 0x%lx", | |
3447 | __func__, clientid, ophead, | |
3448 | (unsigned long)field_offset); | |
1da177e4 LT |
3449 | |
3450 | /* check length */ | |
3451 | field_offset = (__psint_t) | |
3452 | ((xfs_caddr_t)&(ophead->oh_len) - base_ptr); | |
3453 | if (syncing == B_FALSE || (field_offset & 0x1ff)) { | |
67fcb7bf | 3454 | op_len = be32_to_cpu(ophead->oh_len); |
1da177e4 LT |
3455 | } else { |
3456 | idx = BTOBBT((__psint_t)&ophead->oh_len - | |
3457 | (__psint_t)iclog->ic_datap); | |
3458 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { | |
3459 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3460 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
b53e675d | 3461 | op_len = be32_to_cpu(xhdr[j].hic_xheader.xh_cycle_data[k]); |
1da177e4 | 3462 | } else { |
b53e675d | 3463 | op_len = be32_to_cpu(iclog->ic_header.h_cycle_data[idx]); |
1da177e4 LT |
3464 | } |
3465 | } | |
3466 | ptr += sizeof(xlog_op_header_t) + op_len; | |
3467 | } | |
3468 | } /* xlog_verify_iclog */ | |
cfcbbbd0 | 3469 | #endif |
1da177e4 LT |
3470 | |
3471 | /* | |
b22cd72c | 3472 | * Mark all iclogs IOERROR. l_icloglock is held by the caller. |
1da177e4 LT |
3473 | */ |
3474 | STATIC int | |
3475 | xlog_state_ioerror( | |
3476 | xlog_t *log) | |
3477 | { | |
3478 | xlog_in_core_t *iclog, *ic; | |
3479 | ||
3480 | iclog = log->l_iclog; | |
3481 | if (! (iclog->ic_state & XLOG_STATE_IOERROR)) { | |
3482 | /* | |
3483 | * Mark all the incore logs IOERROR. | |
3484 | * From now on, no log flushes will result. | |
3485 | */ | |
3486 | ic = iclog; | |
3487 | do { | |
3488 | ic->ic_state = XLOG_STATE_IOERROR; | |
3489 | ic = ic->ic_next; | |
3490 | } while (ic != iclog); | |
014c2544 | 3491 | return 0; |
1da177e4 LT |
3492 | } |
3493 | /* | |
3494 | * Return non-zero, if state transition has already happened. | |
3495 | */ | |
014c2544 | 3496 | return 1; |
1da177e4 LT |
3497 | } |
3498 | ||
3499 | /* | |
3500 | * This is called from xfs_force_shutdown, when we're forcibly | |
3501 | * shutting down the filesystem, typically because of an IO error. | |
3502 | * Our main objectives here are to make sure that: | |
3503 | * a. the filesystem gets marked 'SHUTDOWN' for all interested | |
3504 | * parties to find out, 'atomically'. | |
3505 | * b. those who're sleeping on log reservations, pinned objects and | |
3506 | * other resources get woken up, and be told the bad news. | |
3507 | * c. nothing new gets queued up after (a) and (b) are done. | |
3508 | * d. if !logerror, flush the iclogs to disk, then seal them off | |
3509 | * for business. | |
9da1ab18 DC |
3510 | * |
3511 | * Note: for delayed logging the !logerror case needs to flush the regions | |
3512 | * held in memory out to the iclogs before flushing them to disk. This needs | |
3513 | * to be done before the log is marked as shutdown, otherwise the flush to the | |
3514 | * iclogs will fail. | |
1da177e4 LT |
3515 | */ |
3516 | int | |
3517 | xfs_log_force_umount( | |
3518 | struct xfs_mount *mp, | |
3519 | int logerror) | |
3520 | { | |
1da177e4 LT |
3521 | xlog_t *log; |
3522 | int retval; | |
1da177e4 LT |
3523 | |
3524 | log = mp->m_log; | |
3525 | ||
3526 | /* | |
3527 | * If this happens during log recovery, don't worry about | |
3528 | * locking; the log isn't open for business yet. | |
3529 | */ | |
3530 | if (!log || | |
3531 | log->l_flags & XLOG_ACTIVE_RECOVERY) { | |
3532 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; | |
bac8dca9 CH |
3533 | if (mp->m_sb_bp) |
3534 | XFS_BUF_DONE(mp->m_sb_bp); | |
014c2544 | 3535 | return 0; |
1da177e4 LT |
3536 | } |
3537 | ||
3538 | /* | |
3539 | * Somebody could've already done the hard work for us. | |
3540 | * No need to get locks for this. | |
3541 | */ | |
3542 | if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { | |
3543 | ASSERT(XLOG_FORCED_SHUTDOWN(log)); | |
014c2544 | 3544 | return 1; |
1da177e4 LT |
3545 | } |
3546 | retval = 0; | |
9da1ab18 DC |
3547 | |
3548 | /* | |
3549 | * Flush the in memory commit item list before marking the log as | |
3550 | * being shut down. We need to do it in this order to ensure all the | |
3551 | * completed transactions are flushed to disk with the xfs_log_force() | |
3552 | * call below. | |
3553 | */ | |
93b8a585 | 3554 | if (!logerror) |
a44f13ed | 3555 | xlog_cil_force(log); |
9da1ab18 | 3556 | |
1da177e4 | 3557 | /* |
3f16b985 DC |
3558 | * mark the filesystem and the as in a shutdown state and wake |
3559 | * everybody up to tell them the bad news. | |
1da177e4 | 3560 | */ |
b22cd72c | 3561 | spin_lock(&log->l_icloglock); |
1da177e4 | 3562 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; |
bac8dca9 CH |
3563 | if (mp->m_sb_bp) |
3564 | XFS_BUF_DONE(mp->m_sb_bp); | |
3565 | ||
1da177e4 LT |
3566 | /* |
3567 | * This flag is sort of redundant because of the mount flag, but | |
3568 | * it's good to maintain the separation between the log and the rest | |
3569 | * of XFS. | |
3570 | */ | |
3571 | log->l_flags |= XLOG_IO_ERROR; | |
3572 | ||
3573 | /* | |
3574 | * If we hit a log error, we want to mark all the iclogs IOERROR | |
3575 | * while we're still holding the loglock. | |
3576 | */ | |
3577 | if (logerror) | |
3578 | retval = xlog_state_ioerror(log); | |
b22cd72c | 3579 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3580 | |
3581 | /* | |
10547941 DC |
3582 | * We don't want anybody waiting for log reservations after this. That |
3583 | * means we have to wake up everybody queued up on reserveq as well as | |
3584 | * writeq. In addition, we make sure in xlog_{re}grant_log_space that | |
3585 | * we don't enqueue anything once the SHUTDOWN flag is set, and this | |
3f16b985 | 3586 | * action is protected by the grant locks. |
1da177e4 | 3587 | */ |
a79bf2d7 CH |
3588 | xlog_grant_head_wake_all(&log->l_reserve_head); |
3589 | xlog_grant_head_wake_all(&log->l_write_head); | |
1da177e4 | 3590 | |
a14a348b | 3591 | if (!(log->l_iclog->ic_state & XLOG_STATE_IOERROR)) { |
1da177e4 LT |
3592 | ASSERT(!logerror); |
3593 | /* | |
3594 | * Force the incore logs to disk before shutting the | |
3595 | * log down completely. | |
3596 | */ | |
a14a348b CH |
3597 | _xfs_log_force(mp, XFS_LOG_SYNC, NULL); |
3598 | ||
b22cd72c | 3599 | spin_lock(&log->l_icloglock); |
1da177e4 | 3600 | retval = xlog_state_ioerror(log); |
b22cd72c | 3601 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3602 | } |
3603 | /* | |
3604 | * Wake up everybody waiting on xfs_log_force. | |
3605 | * Callback all log item committed functions as if the | |
3606 | * log writes were completed. | |
3607 | */ | |
3608 | xlog_state_do_callback(log, XFS_LI_ABORTED, NULL); | |
3609 | ||
3610 | #ifdef XFSERRORDEBUG | |
3611 | { | |
3612 | xlog_in_core_t *iclog; | |
3613 | ||
b22cd72c | 3614 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3615 | iclog = log->l_iclog; |
3616 | do { | |
3617 | ASSERT(iclog->ic_callback == 0); | |
3618 | iclog = iclog->ic_next; | |
3619 | } while (iclog != log->l_iclog); | |
b22cd72c | 3620 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3621 | } |
3622 | #endif | |
3623 | /* return non-zero if log IOERROR transition had already happened */ | |
014c2544 | 3624 | return retval; |
1da177e4 LT |
3625 | } |
3626 | ||
ba0f32d4 | 3627 | STATIC int |
1da177e4 LT |
3628 | xlog_iclogs_empty(xlog_t *log) |
3629 | { | |
3630 | xlog_in_core_t *iclog; | |
3631 | ||
3632 | iclog = log->l_iclog; | |
3633 | do { | |
3634 | /* endianness does not matter here, zero is zero in | |
3635 | * any language. | |
3636 | */ | |
3637 | if (iclog->ic_header.h_num_logops) | |
014c2544 | 3638 | return 0; |
1da177e4 LT |
3639 | iclog = iclog->ic_next; |
3640 | } while (iclog != log->l_iclog); | |
014c2544 | 3641 | return 1; |
1da177e4 | 3642 | } |