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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "xfs.h"
Nathan Scotta844f452005-11-02 14:38:42 +110019#include "xfs_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include "xfs_types.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include "xfs_log.h"
22#include "xfs_trans.h"
Nathan Scotta844f452005-11-02 14:38:42 +110023#include "xfs_sb.h"
24#include "xfs_ag.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include "xfs_mount.h"
26#include "xfs_error.h"
27#include "xfs_log_priv.h"
28#include "xfs_buf_item.h"
Nathan Scotta844f452005-11-02 14:38:42 +110029#include "xfs_bmap_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include "xfs_alloc_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110031#include "xfs_ialloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include "xfs_log_recover.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include "xfs_trans_priv.h"
Nathan Scotta844f452005-11-02 14:38:42 +110034#include "xfs_dinode.h"
35#include "xfs_inode.h"
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000036#include "xfs_trace.h"
Dave Chinnerf661f1e2012-10-08 21:56:02 +110037#include "xfs_fsops.h"
Christoph Hellwig0e446be2012-11-12 22:54:24 +110038#include "xfs_cksum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
David Chinnereb01c9c2008-04-10 12:18:46 +100040kmem_zone_t *xfs_log_ticket_zone;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Linus Torvalds1da177e2005-04-16 15:20:36 -070042/* Local miscellaneous function prototypes */
Mark Tinguelyad223e62012-06-14 09:22:15 -050043STATIC int
44xlog_commit_record(
45 struct xlog *log,
46 struct xlog_ticket *ticket,
47 struct xlog_in_core **iclog,
48 xfs_lsn_t *commitlsnp);
49
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -050050STATIC struct xlog *
51xlog_alloc_log(
52 struct xfs_mount *mp,
53 struct xfs_buftarg *log_target,
54 xfs_daddr_t blk_offset,
55 int num_bblks);
Mark Tinguelyad223e62012-06-14 09:22:15 -050056STATIC int
57xlog_space_left(
58 struct xlog *log,
59 atomic64_t *head);
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -050060STATIC int
61xlog_sync(
62 struct xlog *log,
63 struct xlog_in_core *iclog);
64STATIC void
65xlog_dealloc_log(
66 struct xlog *log);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
68/* local state machine functions */
69STATIC void xlog_state_done_syncing(xlog_in_core_t *iclog, int);
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -050070STATIC void
71xlog_state_do_callback(
72 struct xlog *log,
73 int aborted,
74 struct xlog_in_core *iclog);
75STATIC int
76xlog_state_get_iclog_space(
77 struct xlog *log,
78 int len,
79 struct xlog_in_core **iclog,
80 struct xlog_ticket *ticket,
81 int *continued_write,
82 int *logoffsetp);
83STATIC int
84xlog_state_release_iclog(
85 struct xlog *log,
86 struct xlog_in_core *iclog);
87STATIC void
88xlog_state_switch_iclogs(
89 struct xlog *log,
90 struct xlog_in_core *iclog,
91 int eventual_size);
92STATIC void
93xlog_state_want_sync(
94 struct xlog *log,
95 struct xlog_in_core *iclog);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Mark Tinguelyad223e62012-06-14 09:22:15 -050097STATIC void
98xlog_grant_push_ail(
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -050099 struct xlog *log,
100 int need_bytes);
101STATIC void
102xlog_regrant_reserve_log_space(
103 struct xlog *log,
104 struct xlog_ticket *ticket);
105STATIC void
106xlog_ungrant_log_space(
107 struct xlog *log,
108 struct xlog_ticket *ticket);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Nathan Scottcfcbbbd2005-11-02 15:12:04 +1100110#if defined(DEBUG)
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -0500111STATIC void
112xlog_verify_dest_ptr(
113 struct xlog *log,
114 char *ptr);
Mark Tinguelyad223e62012-06-14 09:22:15 -0500115STATIC void
116xlog_verify_grant_tail(
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -0500117 struct xlog *log);
118STATIC void
119xlog_verify_iclog(
120 struct xlog *log,
121 struct xlog_in_core *iclog,
122 int count,
Thiago Farina667a9292012-11-12 21:32:59 -0200123 bool syncing);
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -0500124STATIC void
125xlog_verify_tail_lsn(
126 struct xlog *log,
127 struct xlog_in_core *iclog,
128 xfs_lsn_t tail_lsn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129#else
130#define xlog_verify_dest_ptr(a,b)
Dave Chinner3f336c62010-12-21 12:02:52 +1100131#define xlog_verify_grant_tail(a)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132#define xlog_verify_iclog(a,b,c,d)
133#define xlog_verify_tail_lsn(a,b,c)
134#endif
135
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -0500136STATIC int
137xlog_iclogs_empty(
138 struct xlog *log);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Christoph Hellwigdd954c62006-01-11 15:34:50 +1100140static void
Dave Chinner663e4962010-12-21 12:06:05 +1100141xlog_grant_sub_space(
Mark Tinguelyad223e62012-06-14 09:22:15 -0500142 struct xlog *log,
143 atomic64_t *head,
144 int bytes)
Christoph Hellwigdd954c62006-01-11 15:34:50 +1100145{
Dave Chinnerd0eb2f32010-12-21 12:29:14 +1100146 int64_t head_val = atomic64_read(head);
147 int64_t new, old;
Dave Chinnera69ed032010-12-21 12:08:20 +1100148
Dave Chinnerd0eb2f32010-12-21 12:29:14 +1100149 do {
150 int cycle, space;
Dave Chinnera69ed032010-12-21 12:08:20 +1100151
Dave Chinnerd0eb2f32010-12-21 12:29:14 +1100152 xlog_crack_grant_head_val(head_val, &cycle, &space);
Dave Chinnera69ed032010-12-21 12:08:20 +1100153
Dave Chinnerd0eb2f32010-12-21 12:29:14 +1100154 space -= bytes;
155 if (space < 0) {
156 space += log->l_logsize;
157 cycle--;
158 }
159
160 old = head_val;
161 new = xlog_assign_grant_head_val(cycle, space);
162 head_val = atomic64_cmpxchg(head, old, new);
163 } while (head_val != old);
Christoph Hellwigdd954c62006-01-11 15:34:50 +1100164}
165
166static void
Dave Chinner663e4962010-12-21 12:06:05 +1100167xlog_grant_add_space(
Mark Tinguelyad223e62012-06-14 09:22:15 -0500168 struct xlog *log,
169 atomic64_t *head,
170 int bytes)
Christoph Hellwigdd954c62006-01-11 15:34:50 +1100171{
Dave Chinnerd0eb2f32010-12-21 12:29:14 +1100172 int64_t head_val = atomic64_read(head);
173 int64_t new, old;
Dave Chinnera69ed032010-12-21 12:08:20 +1100174
Dave Chinnerd0eb2f32010-12-21 12:29:14 +1100175 do {
176 int tmp;
177 int cycle, space;
Dave Chinnera69ed032010-12-21 12:08:20 +1100178
Dave Chinnerd0eb2f32010-12-21 12:29:14 +1100179 xlog_crack_grant_head_val(head_val, &cycle, &space);
Dave Chinnera69ed032010-12-21 12:08:20 +1100180
Dave Chinnerd0eb2f32010-12-21 12:29:14 +1100181 tmp = log->l_logsize - space;
182 if (tmp > bytes)
183 space += bytes;
184 else {
185 space = bytes - tmp;
186 cycle++;
187 }
188
189 old = head_val;
190 new = xlog_assign_grant_head_val(cycle, space);
191 head_val = atomic64_cmpxchg(head, old, new);
192 } while (head_val != old);
Christoph Hellwigdd954c62006-01-11 15:34:50 +1100193}
Dave Chinnera69ed032010-12-21 12:08:20 +1100194
Christoph Hellwigc303c5b2012-02-20 02:31:26 +0000195STATIC void
196xlog_grant_head_init(
197 struct xlog_grant_head *head)
198{
199 xlog_assign_grant_head(&head->grant, 1, 0);
200 INIT_LIST_HEAD(&head->waiters);
201 spin_lock_init(&head->lock);
202}
203
Christoph Hellwiga79bf2d2012-02-20 02:31:27 +0000204STATIC void
205xlog_grant_head_wake_all(
206 struct xlog_grant_head *head)
207{
208 struct xlog_ticket *tic;
209
210 spin_lock(&head->lock);
211 list_for_each_entry(tic, &head->waiters, t_queue)
212 wake_up_process(tic->t_task);
213 spin_unlock(&head->lock);
214}
215
Christoph Hellwige179840d2012-02-20 02:31:29 +0000216static inline int
217xlog_ticket_reservation(
Mark Tinguelyad223e62012-06-14 09:22:15 -0500218 struct xlog *log,
Christoph Hellwige179840d2012-02-20 02:31:29 +0000219 struct xlog_grant_head *head,
220 struct xlog_ticket *tic)
Christoph Hellwig9f9c19e2011-11-28 08:17:36 +0000221{
Christoph Hellwige179840d2012-02-20 02:31:29 +0000222 if (head == &log->l_write_head) {
223 ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV);
224 return tic->t_unit_res;
225 } else {
Christoph Hellwig9f9c19e2011-11-28 08:17:36 +0000226 if (tic->t_flags & XLOG_TIC_PERM_RESERV)
Christoph Hellwige179840d2012-02-20 02:31:29 +0000227 return tic->t_unit_res * tic->t_cnt;
Christoph Hellwig9f9c19e2011-11-28 08:17:36 +0000228 else
Christoph Hellwige179840d2012-02-20 02:31:29 +0000229 return tic->t_unit_res;
Christoph Hellwig9f9c19e2011-11-28 08:17:36 +0000230 }
Christoph Hellwig9f9c19e2011-11-28 08:17:36 +0000231}
232
233STATIC bool
Christoph Hellwige179840d2012-02-20 02:31:29 +0000234xlog_grant_head_wake(
Mark Tinguelyad223e62012-06-14 09:22:15 -0500235 struct xlog *log,
Christoph Hellwige179840d2012-02-20 02:31:29 +0000236 struct xlog_grant_head *head,
Christoph Hellwig9f9c19e2011-11-28 08:17:36 +0000237 int *free_bytes)
238{
239 struct xlog_ticket *tic;
240 int need_bytes;
241
Christoph Hellwige179840d2012-02-20 02:31:29 +0000242 list_for_each_entry(tic, &head->waiters, t_queue) {
243 need_bytes = xlog_ticket_reservation(log, head, tic);
Christoph Hellwig9f9c19e2011-11-28 08:17:36 +0000244 if (*free_bytes < need_bytes)
245 return false;
Christoph Hellwig9f9c19e2011-11-28 08:17:36 +0000246
Christoph Hellwige179840d2012-02-20 02:31:29 +0000247 *free_bytes -= need_bytes;
248 trace_xfs_log_grant_wake_up(log, tic);
Christoph Hellwig14a72352012-02-20 02:31:24 +0000249 wake_up_process(tic->t_task);
Christoph Hellwig9f9c19e2011-11-28 08:17:36 +0000250 }
251
252 return true;
253}
254
255STATIC int
Christoph Hellwig23ee3df2012-02-20 02:31:28 +0000256xlog_grant_head_wait(
Mark Tinguelyad223e62012-06-14 09:22:15 -0500257 struct xlog *log,
Christoph Hellwig23ee3df2012-02-20 02:31:28 +0000258 struct xlog_grant_head *head,
Christoph Hellwig9f9c19e2011-11-28 08:17:36 +0000259 struct xlog_ticket *tic,
260 int need_bytes)
261{
Christoph Hellwig23ee3df2012-02-20 02:31:28 +0000262 list_add_tail(&tic->t_queue, &head->waiters);
Christoph Hellwig9f9c19e2011-11-28 08:17:36 +0000263
264 do {
265 if (XLOG_FORCED_SHUTDOWN(log))
266 goto shutdown;
267 xlog_grant_push_ail(log, need_bytes);
268
Christoph Hellwig14a72352012-02-20 02:31:24 +0000269 __set_current_state(TASK_UNINTERRUPTIBLE);
Christoph Hellwig23ee3df2012-02-20 02:31:28 +0000270 spin_unlock(&head->lock);
Christoph Hellwig9f9c19e2011-11-28 08:17:36 +0000271
Christoph Hellwig14a72352012-02-20 02:31:24 +0000272 XFS_STATS_INC(xs_sleep_logspace);
273
274 trace_xfs_log_grant_sleep(log, tic);
275 schedule();
Christoph Hellwig9f9c19e2011-11-28 08:17:36 +0000276 trace_xfs_log_grant_wake(log, tic);
277
Christoph Hellwig23ee3df2012-02-20 02:31:28 +0000278 spin_lock(&head->lock);
Christoph Hellwig9f9c19e2011-11-28 08:17:36 +0000279 if (XLOG_FORCED_SHUTDOWN(log))
280 goto shutdown;
Christoph Hellwig23ee3df2012-02-20 02:31:28 +0000281 } while (xlog_space_left(log, &head->grant) < need_bytes);
Christoph Hellwig9f9c19e2011-11-28 08:17:36 +0000282
283 list_del_init(&tic->t_queue);
284 return 0;
285shutdown:
286 list_del_init(&tic->t_queue);
287 return XFS_ERROR(EIO);
288}
289
Christoph Hellwig42ceedb2012-02-20 02:31:30 +0000290/*
291 * Atomically get the log space required for a log ticket.
292 *
293 * Once a ticket gets put onto head->waiters, it will only return after the
294 * needed reservation is satisfied.
295 *
296 * This function is structured so that it has a lock free fast path. This is
297 * necessary because every new transaction reservation will come through this
298 * path. Hence any lock will be globally hot if we take it unconditionally on
299 * every pass.
300 *
301 * As tickets are only ever moved on and off head->waiters under head->lock, we
302 * only need to take that lock if we are going to add the ticket to the queue
303 * and sleep. We can avoid taking the lock if the ticket was never added to
304 * head->waiters because the t_queue list head will be empty and we hold the
305 * only reference to it so it can safely be checked unlocked.
306 */
307STATIC int
308xlog_grant_head_check(
Mark Tinguelyad223e62012-06-14 09:22:15 -0500309 struct xlog *log,
Christoph Hellwig42ceedb2012-02-20 02:31:30 +0000310 struct xlog_grant_head *head,
311 struct xlog_ticket *tic,
312 int *need_bytes)
313{
314 int free_bytes;
315 int error = 0;
316
317 ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY));
318
319 /*
320 * If there are other waiters on the queue then give them a chance at
321 * logspace before us. Wake up the first waiters, if we do not wake
322 * up all the waiters then go to sleep waiting for more free space,
323 * otherwise try to get some space for this transaction.
324 */
325 *need_bytes = xlog_ticket_reservation(log, head, tic);
326 free_bytes = xlog_space_left(log, &head->grant);
327 if (!list_empty_careful(&head->waiters)) {
328 spin_lock(&head->lock);
329 if (!xlog_grant_head_wake(log, head, &free_bytes) ||
330 free_bytes < *need_bytes) {
331 error = xlog_grant_head_wait(log, head, tic,
332 *need_bytes);
333 }
334 spin_unlock(&head->lock);
335 } else if (free_bytes < *need_bytes) {
336 spin_lock(&head->lock);
337 error = xlog_grant_head_wait(log, head, tic, *need_bytes);
338 spin_unlock(&head->lock);
339 }
340
341 return error;
342}
343
Christoph Hellwig0adba532007-08-30 17:21:46 +1000344static void
345xlog_tic_reset_res(xlog_ticket_t *tic)
346{
347 tic->t_res_num = 0;
348 tic->t_res_arr_sum = 0;
349 tic->t_res_num_ophdrs = 0;
350}
351
352static void
353xlog_tic_add_region(xlog_ticket_t *tic, uint len, uint type)
354{
355 if (tic->t_res_num == XLOG_TIC_LEN_MAX) {
356 /* add to overflow and start again */
357 tic->t_res_o_flow += tic->t_res_arr_sum;
358 tic->t_res_num = 0;
359 tic->t_res_arr_sum = 0;
360 }
361
362 tic->t_res_arr[tic->t_res_num].r_len = len;
363 tic->t_res_arr[tic->t_res_num].r_type = type;
364 tic->t_res_arr_sum += len;
365 tic->t_res_num++;
366}
Christoph Hellwigdd954c62006-01-11 15:34:50 +1100367
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368/*
Christoph Hellwig9006fb92012-02-20 02:31:31 +0000369 * Replenish the byte reservation required by moving the grant write head.
370 */
371int
372xfs_log_regrant(
373 struct xfs_mount *mp,
374 struct xlog_ticket *tic)
375{
Mark Tinguelyad223e62012-06-14 09:22:15 -0500376 struct xlog *log = mp->m_log;
Christoph Hellwig9006fb92012-02-20 02:31:31 +0000377 int need_bytes;
378 int error = 0;
379
380 if (XLOG_FORCED_SHUTDOWN(log))
381 return XFS_ERROR(EIO);
382
383 XFS_STATS_INC(xs_try_logspace);
384
385 /*
386 * This is a new transaction on the ticket, so we need to change the
387 * transaction ID so that the next transaction has a different TID in
388 * the log. Just add one to the existing tid so that we can see chains
389 * of rolling transactions in the log easily.
390 */
391 tic->t_tid++;
392
393 xlog_grant_push_ail(log, tic->t_unit_res);
394
395 tic->t_curr_res = tic->t_unit_res;
396 xlog_tic_reset_res(tic);
397
398 if (tic->t_cnt > 0)
399 return 0;
400
401 trace_xfs_log_regrant(log, tic);
402
403 error = xlog_grant_head_check(log, &log->l_write_head, tic,
404 &need_bytes);
405 if (error)
406 goto out_error;
407
408 xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes);
409 trace_xfs_log_regrant_exit(log, tic);
410 xlog_verify_grant_tail(log);
411 return 0;
412
413out_error:
414 /*
415 * If we are failing, make sure the ticket doesn't have any current
416 * reservations. We don't want to add this back when the ticket/
417 * transaction gets cancelled.
418 */
419 tic->t_curr_res = 0;
420 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */
421 return error;
422}
423
424/*
425 * Reserve log space and return a ticket corresponding the reservation.
426 *
427 * Each reservation is going to reserve extra space for a log record header.
428 * When writes happen to the on-disk log, we don't subtract the length of the
429 * log record header from any reservation. By wasting space in each
430 * reservation, we prevent over allocation problems.
431 */
432int
433xfs_log_reserve(
434 struct xfs_mount *mp,
435 int unit_bytes,
436 int cnt,
437 struct xlog_ticket **ticp,
438 __uint8_t client,
439 bool permanent,
440 uint t_type)
441{
Mark Tinguelyad223e62012-06-14 09:22:15 -0500442 struct xlog *log = mp->m_log;
Christoph Hellwig9006fb92012-02-20 02:31:31 +0000443 struct xlog_ticket *tic;
444 int need_bytes;
445 int error = 0;
446
447 ASSERT(client == XFS_TRANSACTION || client == XFS_LOG);
448
449 if (XLOG_FORCED_SHUTDOWN(log))
450 return XFS_ERROR(EIO);
451
452 XFS_STATS_INC(xs_try_logspace);
453
454 ASSERT(*ticp == NULL);
455 tic = xlog_ticket_alloc(log, unit_bytes, cnt, client, permanent,
456 KM_SLEEP | KM_MAYFAIL);
457 if (!tic)
458 return XFS_ERROR(ENOMEM);
459
460 tic->t_trans_type = t_type;
461 *ticp = tic;
462
Dave Chinner437a2552012-11-28 13:01:00 +1100463 xlog_grant_push_ail(log, tic->t_cnt ? tic->t_unit_res * tic->t_cnt
464 : tic->t_unit_res);
Christoph Hellwig9006fb92012-02-20 02:31:31 +0000465
466 trace_xfs_log_reserve(log, tic);
467
468 error = xlog_grant_head_check(log, &log->l_reserve_head, tic,
469 &need_bytes);
470 if (error)
471 goto out_error;
472
473 xlog_grant_add_space(log, &log->l_reserve_head.grant, need_bytes);
474 xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes);
475 trace_xfs_log_reserve_exit(log, tic);
476 xlog_verify_grant_tail(log);
477 return 0;
478
479out_error:
480 /*
481 * If we are failing, make sure the ticket doesn't have any current
482 * reservations. We don't want to add this back when the ticket/
483 * transaction gets cancelled.
484 */
485 tic->t_curr_res = 0;
486 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */
487 return error;
488}
489
490
491/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 * NOTES:
493 *
494 * 1. currblock field gets updated at startup and after in-core logs
495 * marked as with WANT_SYNC.
496 */
497
498/*
499 * This routine is called when a user of a log manager ticket is done with
500 * the reservation. If the ticket was ever used, then a commit record for
501 * the associated transaction is written out as a log operation header with
502 * no data. The flag XLOG_TIC_INITED is set when the first write occurs with
503 * a given ticket. If the ticket was one with a permanent reservation, then
504 * a few operations are done differently. Permanent reservation tickets by
505 * default don't release the reservation. They just commit the current
506 * transaction with the belief that the reservation is still needed. A flag
507 * must be passed in before permanent reservations are actually released.
508 * When these type of tickets are not released, they need to be set into
509 * the inited state again. By doing this, a start record will be written
510 * out when the next write occurs.
511 */
512xfs_lsn_t
Christoph Hellwig35a8a722010-02-15 23:34:54 +0000513xfs_log_done(
514 struct xfs_mount *mp,
515 struct xlog_ticket *ticket,
516 struct xlog_in_core **iclog,
517 uint flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518{
Mark Tinguelyad223e62012-06-14 09:22:15 -0500519 struct xlog *log = mp->m_log;
Christoph Hellwig35a8a722010-02-15 23:34:54 +0000520 xfs_lsn_t lsn = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 if (XLOG_FORCED_SHUTDOWN(log) ||
523 /*
524 * If nothing was ever written, don't write out commit record.
525 * If we get an error, just continue and give back the log ticket.
526 */
527 (((ticket->t_flags & XLOG_TIC_INITED) == 0) &&
Dave Chinner55b66332010-03-23 11:43:17 +1100528 (xlog_commit_record(log, ticket, iclog, &lsn)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 lsn = (xfs_lsn_t) -1;
530 if (ticket->t_flags & XLOG_TIC_PERM_RESERV) {
531 flags |= XFS_LOG_REL_PERM_RESERV;
532 }
533 }
534
535
536 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 ||
537 (flags & XFS_LOG_REL_PERM_RESERV)) {
Christoph Hellwig0b1b2132009-12-14 23:14:59 +0000538 trace_xfs_log_done_nonperm(log, ticket);
539
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 /*
Nathan Scottc41564b2006-03-29 08:55:14 +1000541 * Release ticket if not permanent reservation or a specific
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 * request has been made to release a permanent reservation.
543 */
544 xlog_ungrant_log_space(log, ticket);
Dave Chinnercc09c0d2008-11-17 17:37:10 +1100545 xfs_log_ticket_put(ticket);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 } else {
Christoph Hellwig0b1b2132009-12-14 23:14:59 +0000547 trace_xfs_log_done_perm(log, ticket);
548
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 xlog_regrant_reserve_log_space(log, ticket);
Lachlan McIlroyc6a7b0f2008-08-13 16:52:50 +1000550 /* If this ticket was a permanent reservation and we aren't
551 * trying to release it, reset the inited flags; so next time
552 * we write, a start record will be written out.
553 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 ticket->t_flags |= XLOG_TIC_INITED;
Lachlan McIlroyc6a7b0f2008-08-13 16:52:50 +1000555 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
557 return lsn;
Christoph Hellwig35a8a722010-02-15 23:34:54 +0000558}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560/*
561 * Attaches a new iclog I/O completion callback routine during
562 * transaction commit. If the log is in error state, a non-zero
563 * return code is handed back and the caller is responsible for
564 * executing the callback at an appropriate time.
565 */
566int
Christoph Hellwig35a8a722010-02-15 23:34:54 +0000567xfs_log_notify(
568 struct xfs_mount *mp,
569 struct xlog_in_core *iclog,
570 xfs_log_callback_t *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571{
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000572 int abortflg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
David Chinner114d23a2008-04-10 12:18:39 +1000574 spin_lock(&iclog->ic_callback_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 abortflg = (iclog->ic_state & XLOG_STATE_IOERROR);
576 if (!abortflg) {
577 ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) ||
578 (iclog->ic_state == XLOG_STATE_WANT_SYNC));
579 cb->cb_next = NULL;
580 *(iclog->ic_callback_tail) = cb;
581 iclog->ic_callback_tail = &(cb->cb_next);
582 }
David Chinner114d23a2008-04-10 12:18:39 +1000583 spin_unlock(&iclog->ic_callback_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 return abortflg;
Christoph Hellwig35a8a722010-02-15 23:34:54 +0000585}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
587int
Christoph Hellwig35a8a722010-02-15 23:34:54 +0000588xfs_log_release_iclog(
589 struct xfs_mount *mp,
590 struct xlog_in_core *iclog)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591{
Christoph Hellwig35a8a722010-02-15 23:34:54 +0000592 if (xlog_state_release_iclog(mp->m_log, iclog)) {
Nathan Scott7d04a332006-06-09 14:58:38 +1000593 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
Jesper Juhl014c2542006-01-15 02:37:08 +0100594 return EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 }
596
597 return 0;
598}
599
600/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 * Mount a log filesystem
602 *
603 * mp - ubiquitous xfs mount point structure
604 * log_target - buftarg of on-disk log device
605 * blk_offset - Start block # where block size is 512 bytes (BBSIZE)
606 * num_bblocks - Number of BBSIZE blocks in on-disk log
607 *
608 * Return error or zero.
609 */
610int
David Chinner249a8c12008-02-05 12:13:32 +1100611xfs_log_mount(
612 xfs_mount_t *mp,
613 xfs_buftarg_t *log_target,
614 xfs_daddr_t blk_offset,
615 int num_bblks)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616{
David Chinner249a8c12008-02-05 12:13:32 +1100617 int error;
618
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY))
Dave Chinnera0fa2b62011-03-07 10:01:35 +1100620 xfs_notice(mp, "Mounting Filesystem");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 else {
Dave Chinnera0fa2b62011-03-07 10:01:35 +1100622 xfs_notice(mp,
623"Mounting filesystem in no-recovery mode. Filesystem will be inconsistent.");
Christoph Hellwigbd186aa2007-08-30 17:21:12 +1000624 ASSERT(mp->m_flags & XFS_MOUNT_RDONLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 }
626
627 mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks);
Dave Chinnera6cb7672009-04-06 18:39:27 +0200628 if (IS_ERR(mp->m_log)) {
629 error = -PTR_ERR(mp->m_log);
Dave Chinner644c3562008-11-10 16:50:24 +1100630 goto out;
631 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 /*
David Chinner249a8c12008-02-05 12:13:32 +1100634 * Initialize the AIL now we have a log.
635 */
David Chinner249a8c12008-02-05 12:13:32 +1100636 error = xfs_trans_ail_init(mp);
637 if (error) {
Dave Chinnera0fa2b62011-03-07 10:01:35 +1100638 xfs_warn(mp, "AIL initialisation failed: error %d", error);
Christoph Hellwig26430752009-02-12 19:55:48 +0100639 goto out_free_log;
David Chinner249a8c12008-02-05 12:13:32 +1100640 }
David Chinnera9c21c12008-10-30 17:39:35 +1100641 mp->m_log->l_ailp = mp->m_ail;
David Chinner249a8c12008-02-05 12:13:32 +1100642
643 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 * skip log recovery on a norecovery mount. pretend it all
645 * just worked.
646 */
647 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) {
David Chinner249a8c12008-02-05 12:13:32 +1100648 int readonly = (mp->m_flags & XFS_MOUNT_RDONLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
650 if (readonly)
Christoph Hellwigbd186aa2007-08-30 17:21:12 +1000651 mp->m_flags &= ~XFS_MOUNT_RDONLY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
Eric Sandeen65be6052006-01-11 15:34:19 +1100653 error = xlog_recover(mp->m_log);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
655 if (readonly)
Christoph Hellwigbd186aa2007-08-30 17:21:12 +1000656 mp->m_flags |= XFS_MOUNT_RDONLY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 if (error) {
Dave Chinnera0fa2b62011-03-07 10:01:35 +1100658 xfs_warn(mp, "log mount/recovery failed: error %d",
659 error);
Christoph Hellwig26430752009-02-12 19:55:48 +0100660 goto out_destroy_ail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 }
662 }
663
664 /* Normal transactions can now occur */
665 mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY;
666
Dave Chinner71e330b2010-05-21 14:37:18 +1000667 /*
668 * Now the log has been fully initialised and we know were our
669 * space grant counters are, we can initialise the permanent ticket
670 * needed for delayed logging to work.
671 */
672 xlog_cil_init_post_recovery(mp->m_log);
673
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 return 0;
Christoph Hellwig26430752009-02-12 19:55:48 +0100675
676out_destroy_ail:
677 xfs_trans_ail_destroy(mp);
678out_free_log:
679 xlog_dealloc_log(mp->m_log);
Dave Chinner644c3562008-11-10 16:50:24 +1100680out:
David Chinner249a8c12008-02-05 12:13:32 +1100681 return error;
Christoph Hellwig26430752009-02-12 19:55:48 +0100682}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
684/*
Dave Chinnerf661f1e2012-10-08 21:56:02 +1100685 * Finish the recovery of the file system. This is separate from the
686 * xfs_log_mount() call, because it depends on the code in xfs_mountfs() to read
687 * in the root and real-time bitmap inodes between calling xfs_log_mount() and
688 * here.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 *
Dave Chinnerf661f1e2012-10-08 21:56:02 +1100690 * If we finish recovery successfully, start the background log work. If we are
691 * not doing recovery, then we have a RO filesystem and we don't need to start
692 * it.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 */
694int
Christoph Hellwig42490232008-08-13 16:49:32 +1000695xfs_log_mount_finish(xfs_mount_t *mp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696{
Dave Chinnerf661f1e2012-10-08 21:56:02 +1100697 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
Dave Chinnerf661f1e2012-10-08 21:56:02 +1100699 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) {
Christoph Hellwig42490232008-08-13 16:49:32 +1000700 error = xlog_recover_finish(mp->m_log);
Dave Chinnerf661f1e2012-10-08 21:56:02 +1100701 if (!error)
702 xfs_log_work_queue(mp);
703 } else {
Christoph Hellwigbd186aa2007-08-30 17:21:12 +1000704 ASSERT(mp->m_flags & XFS_MOUNT_RDONLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 }
706
Dave Chinnerf661f1e2012-10-08 21:56:02 +1100707
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 return error;
709}
710
711/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 * Final log writes as part of unmount.
713 *
714 * Mark the filesystem clean as unmount happens. Note that during relocation
715 * this routine needs to be executed as part of source-bag while the
716 * deallocation must not be done until source-end.
717 */
718
719/*
720 * Unmount record used to have a string "Unmount filesystem--" in the
721 * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE).
722 * We just write the magic number now since that particular field isn't
723 * currently architecture converted and "nUmount" is a bit foo.
724 * As far as I know, there weren't any dependencies on the old behaviour.
725 */
726
727int
728xfs_log_unmount_write(xfs_mount_t *mp)
729{
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -0500730 struct xlog *log = mp->m_log;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 xlog_in_core_t *iclog;
732#ifdef DEBUG
733 xlog_in_core_t *first_iclog;
734#endif
Christoph Hellwig35a8a722010-02-15 23:34:54 +0000735 xlog_ticket_t *tic = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 xfs_lsn_t lsn;
737 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 /*
740 * Don't write out unmount record on read-only mounts.
741 * Or, if we are doing a forced umount (typically because of IO errors).
742 */
Christoph Hellwigbd186aa2007-08-30 17:21:12 +1000743 if (mp->m_flags & XFS_MOUNT_RDONLY)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 return 0;
745
Christoph Hellwiga14a3482010-01-19 09:56:46 +0000746 error = _xfs_log_force(mp, XFS_LOG_SYNC, NULL);
David Chinnerb911ca02008-04-10 12:24:30 +1000747 ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748
749#ifdef DEBUG
750 first_iclog = iclog = log->l_iclog;
751 do {
752 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) {
753 ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE);
754 ASSERT(iclog->ic_offset == 0);
755 }
756 iclog = iclog->ic_next;
757 } while (iclog != first_iclog);
758#endif
759 if (! (XLOG_FORCED_SHUTDOWN(log))) {
Tim Shimmin955e47a2006-09-28 11:04:16 +1000760 error = xfs_log_reserve(mp, 600, 1, &tic,
761 XFS_LOG, 0, XLOG_UNMOUNT_REC_TYPE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 if (!error) {
Dave Chinner55b66332010-03-23 11:43:17 +1100763 /* the data section must be 32 bit size aligned */
764 struct {
765 __uint16_t magic;
766 __uint16_t pad1;
767 __uint32_t pad2; /* may as well make it 64 bits */
768 } magic = {
769 .magic = XLOG_UNMOUNT_TYPE,
770 };
771 struct xfs_log_iovec reg = {
Christoph Hellwig4e0d5f92010-06-23 18:11:15 +1000772 .i_addr = &magic,
Dave Chinner55b66332010-03-23 11:43:17 +1100773 .i_len = sizeof(magic),
774 .i_type = XLOG_REG_TYPE_UNMOUNT,
775 };
776 struct xfs_log_vec vec = {
777 .lv_niovecs = 1,
778 .lv_iovecp = &reg,
779 };
780
Dave Chinner39486592012-03-22 05:15:11 +0000781 /* remove inited flag, and account for space used */
Dave Chinner55b66332010-03-23 11:43:17 +1100782 tic->t_flags = 0;
Dave Chinner39486592012-03-22 05:15:11 +0000783 tic->t_curr_res -= sizeof(magic);
Dave Chinner55b66332010-03-23 11:43:17 +1100784 error = xlog_write(log, &vec, tic, &lsn,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 NULL, XLOG_UNMOUNT_TRANS);
786 /*
787 * At this point, we're umounting anyway,
788 * so there's no point in transitioning log state
789 * to IOERROR. Just continue...
790 */
791 }
792
Dave Chinnera0fa2b62011-03-07 10:01:35 +1100793 if (error)
794 xfs_alert(mp, "%s: unmount record failed", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795
796
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000797 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 iclog = log->l_iclog;
David Chinner155cc6b2008-03-06 13:44:14 +1100799 atomic_inc(&iclog->ic_refcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 xlog_state_want_sync(log, iclog);
Christoph Hellwig39e2def2008-12-03 12:20:28 +0100801 spin_unlock(&log->l_icloglock);
David Chinner1bb7d6b2008-04-10 12:24:38 +1000802 error = xlog_state_release_iclog(log, iclog);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000804 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 if (!(iclog->ic_state == XLOG_STATE_ACTIVE ||
806 iclog->ic_state == XLOG_STATE_DIRTY)) {
807 if (!XLOG_FORCED_SHUTDOWN(log)) {
Dave Chinnereb40a872010-12-21 12:09:01 +1100808 xlog_wait(&iclog->ic_force_wait,
809 &log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 } else {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000811 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 }
813 } else {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000814 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 }
Tim Shimmin955e47a2006-09-28 11:04:16 +1000816 if (tic) {
Christoph Hellwig0b1b2132009-12-14 23:14:59 +0000817 trace_xfs_log_umount_write(log, tic);
Tim Shimmin955e47a2006-09-28 11:04:16 +1000818 xlog_ungrant_log_space(log, tic);
Dave Chinnercc09c0d2008-11-17 17:37:10 +1100819 xfs_log_ticket_put(tic);
Tim Shimmin955e47a2006-09-28 11:04:16 +1000820 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 } else {
822 /*
823 * We're already in forced_shutdown mode, couldn't
824 * even attempt to write out the unmount transaction.
825 *
826 * Go through the motions of sync'ing and releasing
827 * the iclog, even though no I/O will actually happen,
Nathan Scottc41564b2006-03-29 08:55:14 +1000828 * we need to wait for other log I/Os that may already
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 * be in progress. Do this as a separate section of
830 * code so we'll know if we ever get stuck here that
831 * we're in this odd situation of trying to unmount
832 * a file system that went into forced_shutdown as
833 * the result of an unmount..
834 */
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000835 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 iclog = log->l_iclog;
David Chinner155cc6b2008-03-06 13:44:14 +1100837 atomic_inc(&iclog->ic_refcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
839 xlog_state_want_sync(log, iclog);
Christoph Hellwig39e2def2008-12-03 12:20:28 +0100840 spin_unlock(&log->l_icloglock);
David Chinner1bb7d6b2008-04-10 12:24:38 +1000841 error = xlog_state_release_iclog(log, iclog);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000843 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844
845 if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE
846 || iclog->ic_state == XLOG_STATE_DIRTY
847 || iclog->ic_state == XLOG_STATE_IOERROR) ) {
848
Dave Chinnereb40a872010-12-21 12:09:01 +1100849 xlog_wait(&iclog->ic_force_wait,
850 &log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 } else {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000852 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 }
854 }
855
David Chinner1bb7d6b2008-04-10 12:24:38 +1000856 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857} /* xfs_log_unmount_write */
858
859/*
Dave Chinnerc75921a2012-10-08 21:56:08 +1100860 * Empty the log for unmount/freeze.
Dave Chinnercf2931d2012-10-08 21:56:03 +1100861 *
862 * To do this, we first need to shut down the background log work so it is not
863 * trying to cover the log as we clean up. We then need to unpin all objects in
864 * the log so we can then flush them out. Once they have completed their IO and
865 * run the callbacks removing themselves from the AIL, we can write the unmount
Dave Chinnerc75921a2012-10-08 21:56:08 +1100866 * record.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 */
868void
Dave Chinnerc75921a2012-10-08 21:56:08 +1100869xfs_log_quiesce(
870 struct xfs_mount *mp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871{
Dave Chinnerf661f1e2012-10-08 21:56:02 +1100872 cancel_delayed_work_sync(&mp->m_log->l_work);
Dave Chinnercf2931d2012-10-08 21:56:03 +1100873 xfs_log_force(mp, XFS_LOG_SYNC);
874
875 /*
876 * The superblock buffer is uncached and while xfs_ail_push_all_sync()
877 * will push it, xfs_wait_buftarg() will not wait for it. Further,
878 * xfs_buf_iowait() cannot be used because it was pushed with the
879 * XBF_ASYNC flag set, so we need to use a lock/unlock pair to wait for
880 * the IO to complete.
881 */
882 xfs_ail_push_all_sync(mp->m_ail);
883 xfs_wait_buftarg(mp->m_ddev_targp);
884 xfs_buf_lock(mp->m_sb_bp);
885 xfs_buf_unlock(mp->m_sb_bp);
886
887 xfs_log_unmount_write(mp);
Dave Chinnerc75921a2012-10-08 21:56:08 +1100888}
889
890/*
891 * Shut down and release the AIL and Log.
892 *
893 * During unmount, we need to ensure we flush all the dirty metadata objects
894 * from the AIL so that the log is empty before we write the unmount record to
895 * the log. Once this is done, we can tear down the AIL and the log.
896 */
897void
898xfs_log_unmount(
899 struct xfs_mount *mp)
900{
901 xfs_log_quiesce(mp);
Dave Chinnercf2931d2012-10-08 21:56:03 +1100902
David Chinner249a8c12008-02-05 12:13:32 +1100903 xfs_trans_ail_destroy(mp);
Nathan Scottc41564b2006-03-29 08:55:14 +1000904 xlog_dealloc_log(mp->m_log);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905}
906
Dave Chinner43f5efc2010-03-23 10:10:00 +1100907void
908xfs_log_item_init(
909 struct xfs_mount *mp,
910 struct xfs_log_item *item,
911 int type,
Christoph Hellwig272e42b2011-10-28 09:54:24 +0000912 const struct xfs_item_ops *ops)
Dave Chinner43f5efc2010-03-23 10:10:00 +1100913{
914 item->li_mountp = mp;
915 item->li_ailp = mp->m_ail;
916 item->li_type = type;
917 item->li_ops = ops;
Dave Chinner71e330b2010-05-21 14:37:18 +1000918 item->li_lv = NULL;
919
920 INIT_LIST_HEAD(&item->li_ail);
921 INIT_LIST_HEAD(&item->li_cil);
Dave Chinner43f5efc2010-03-23 10:10:00 +1100922}
923
Christoph Hellwig09a423a2012-02-20 02:31:20 +0000924/*
925 * Wake up processes waiting for log space after we have moved the log tail.
Christoph Hellwig09a423a2012-02-20 02:31:20 +0000926 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927void
Christoph Hellwig09a423a2012-02-20 02:31:20 +0000928xfs_log_space_wake(
Christoph Hellwigcfb7cdc2012-02-20 02:31:23 +0000929 struct xfs_mount *mp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930{
Mark Tinguelyad223e62012-06-14 09:22:15 -0500931 struct xlog *log = mp->m_log;
Christoph Hellwigcfb7cdc2012-02-20 02:31:23 +0000932 int free_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 if (XLOG_FORCED_SHUTDOWN(log))
935 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936
Christoph Hellwig28496962012-02-20 02:31:25 +0000937 if (!list_empty_careful(&log->l_write_head.waiters)) {
Christoph Hellwig09a423a2012-02-20 02:31:20 +0000938 ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY));
939
Christoph Hellwig28496962012-02-20 02:31:25 +0000940 spin_lock(&log->l_write_head.lock);
941 free_bytes = xlog_space_left(log, &log->l_write_head.grant);
Christoph Hellwige179840d2012-02-20 02:31:29 +0000942 xlog_grant_head_wake(log, &log->l_write_head, &free_bytes);
Christoph Hellwig28496962012-02-20 02:31:25 +0000943 spin_unlock(&log->l_write_head.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 }
Dave Chinner10547942010-12-21 12:02:25 +1100945
Christoph Hellwig28496962012-02-20 02:31:25 +0000946 if (!list_empty_careful(&log->l_reserve_head.waiters)) {
Christoph Hellwig09a423a2012-02-20 02:31:20 +0000947 ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY));
948
Christoph Hellwig28496962012-02-20 02:31:25 +0000949 spin_lock(&log->l_reserve_head.lock);
950 free_bytes = xlog_space_left(log, &log->l_reserve_head.grant);
Christoph Hellwige179840d2012-02-20 02:31:29 +0000951 xlog_grant_head_wake(log, &log->l_reserve_head, &free_bytes);
Christoph Hellwig28496962012-02-20 02:31:25 +0000952 spin_unlock(&log->l_reserve_head.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 }
Dave Chinner3f16b982010-12-21 12:29:01 +1100954}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
956/*
957 * Determine if we have a transaction that has gone to disk
Dave Chinnerb6f8dd42010-04-13 15:06:44 +1000958 * that needs to be covered. To begin the transition to the idle state
959 * firstly the log needs to be idle (no AIL and nothing in the iclogs).
960 * If we are then in a state where covering is needed, the caller is informed
961 * that dummy transactions are required to move the log into the idle state.
962 *
963 * Because this is called as part of the sync process, we should also indicate
964 * that dummy transactions should be issued in anything but the covered or
965 * idle states. This ensures that the log tail is accurately reflected in
966 * the log at the end of the sync, hence if a crash occurrs avoids replay
967 * of transactions where the metadata is already on disk.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 */
969int
970xfs_log_need_covered(xfs_mount_t *mp)
971{
David Chinner27d8d5f2008-10-30 17:38:39 +1100972 int needed = 0;
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -0500973 struct xlog *log = mp->m_log;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974
David Chinner92821e22007-05-24 15:26:31 +1000975 if (!xfs_fs_writable(mp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 return 0;
977
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000978 spin_lock(&log->l_icloglock);
Dave Chinnerb6f8dd42010-04-13 15:06:44 +1000979 switch (log->l_covered_state) {
980 case XLOG_STATE_COVER_DONE:
981 case XLOG_STATE_COVER_DONE2:
982 case XLOG_STATE_COVER_IDLE:
983 break;
984 case XLOG_STATE_COVER_NEED:
985 case XLOG_STATE_COVER_NEED2:
Dave Chinnerfd074842011-04-08 12:45:07 +1000986 if (!xfs_ail_min_lsn(log->l_ailp) &&
Dave Chinnerb6f8dd42010-04-13 15:06:44 +1000987 xlog_iclogs_empty(log)) {
988 if (log->l_covered_state == XLOG_STATE_COVER_NEED)
989 log->l_covered_state = XLOG_STATE_COVER_DONE;
990 else
991 log->l_covered_state = XLOG_STATE_COVER_DONE2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 }
Dave Chinnerb6f8dd42010-04-13 15:06:44 +1000993 /* FALLTHRU */
994 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 needed = 1;
Dave Chinnerb6f8dd42010-04-13 15:06:44 +1000996 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 }
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000998 spin_unlock(&log->l_icloglock);
Jesper Juhl014c2542006-01-15 02:37:08 +0100999 return needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000}
1001
Christoph Hellwig09a423a2012-02-20 02:31:20 +00001002/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 * We may be holding the log iclog lock upon entering this routine.
1004 */
1005xfs_lsn_t
Christoph Hellwig1c304622012-04-23 15:58:33 +10001006xlog_assign_tail_lsn_locked(
Dave Chinner1c3cb9e2010-12-21 12:28:39 +11001007 struct xfs_mount *mp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008{
Mark Tinguelyad223e62012-06-14 09:22:15 -05001009 struct xlog *log = mp->m_log;
Christoph Hellwig1c304622012-04-23 15:58:33 +10001010 struct xfs_log_item *lip;
1011 xfs_lsn_t tail_lsn;
1012
1013 assert_spin_locked(&mp->m_ail->xa_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
Christoph Hellwig09a423a2012-02-20 02:31:20 +00001015 /*
1016 * To make sure we always have a valid LSN for the log tail we keep
1017 * track of the last LSN which was committed in log->l_last_sync_lsn,
Christoph Hellwig1c304622012-04-23 15:58:33 +10001018 * and use that when the AIL was empty.
Christoph Hellwig09a423a2012-02-20 02:31:20 +00001019 */
Christoph Hellwig1c304622012-04-23 15:58:33 +10001020 lip = xfs_ail_min(mp->m_ail);
1021 if (lip)
1022 tail_lsn = lip->li_lsn;
1023 else
Dave Chinner84f3c682010-12-03 22:11:29 +11001024 tail_lsn = atomic64_read(&log->l_last_sync_lsn);
Dave Chinner1c3cb9e2010-12-21 12:28:39 +11001025 atomic64_set(&log->l_tail_lsn, tail_lsn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 return tail_lsn;
Dave Chinner1c3cb9e2010-12-21 12:28:39 +11001027}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028
Christoph Hellwig1c304622012-04-23 15:58:33 +10001029xfs_lsn_t
1030xlog_assign_tail_lsn(
1031 struct xfs_mount *mp)
1032{
1033 xfs_lsn_t tail_lsn;
1034
1035 spin_lock(&mp->m_ail->xa_lock);
1036 tail_lsn = xlog_assign_tail_lsn_locked(mp);
1037 spin_unlock(&mp->m_ail->xa_lock);
1038
1039 return tail_lsn;
1040}
1041
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042/*
1043 * Return the space in the log between the tail and the head. The head
1044 * is passed in the cycle/bytes formal parms. In the special case where
1045 * the reserve head has wrapped passed the tail, this calculation is no
1046 * longer valid. In this case, just return 0 which means there is no space
1047 * in the log. This works for all places where this function is called
1048 * with the reserve head. Of course, if the write head were to ever
1049 * wrap the tail, we should blow up. Rather than catch this case here,
1050 * we depend on other ASSERTions in other parts of the code. XXXmiken
1051 *
1052 * This code also handles the case where the reservation head is behind
1053 * the tail. The details of this case are described below, but the end
1054 * result is that we return the size of the log as the amount of space left.
1055 */
David Chinnera8272ce2007-11-23 16:28:09 +11001056STATIC int
Dave Chinnera69ed032010-12-21 12:08:20 +11001057xlog_space_left(
Mark Tinguelyad223e62012-06-14 09:22:15 -05001058 struct xlog *log,
Dave Chinnerc8a09ff2010-12-04 00:02:40 +11001059 atomic64_t *head)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060{
Dave Chinnera69ed032010-12-21 12:08:20 +11001061 int free_bytes;
1062 int tail_bytes;
1063 int tail_cycle;
1064 int head_cycle;
1065 int head_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066
Dave Chinnera69ed032010-12-21 12:08:20 +11001067 xlog_crack_grant_head(head, &head_cycle, &head_bytes);
Dave Chinner1c3cb9e2010-12-21 12:28:39 +11001068 xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_bytes);
1069 tail_bytes = BBTOB(tail_bytes);
Dave Chinnera69ed032010-12-21 12:08:20 +11001070 if (tail_cycle == head_cycle && head_bytes >= tail_bytes)
1071 free_bytes = log->l_logsize - (head_bytes - tail_bytes);
1072 else if (tail_cycle + 1 < head_cycle)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 return 0;
Dave Chinnera69ed032010-12-21 12:08:20 +11001074 else if (tail_cycle < head_cycle) {
1075 ASSERT(tail_cycle == (head_cycle - 1));
1076 free_bytes = tail_bytes - head_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 } else {
1078 /*
1079 * The reservation head is behind the tail.
1080 * In this case we just want to return the size of the
1081 * log as the amount of space left.
1082 */
Dave Chinnera0fa2b62011-03-07 10:01:35 +11001083 xfs_alert(log->l_mp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 "xlog_space_left: head behind tail\n"
1085 " tail_cycle = %d, tail_bytes = %d\n"
1086 " GH cycle = %d, GH bytes = %d",
Dave Chinnera69ed032010-12-21 12:08:20 +11001087 tail_cycle, tail_bytes, head_cycle, head_bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 ASSERT(0);
1089 free_bytes = log->l_logsize;
1090 }
1091 return free_bytes;
Dave Chinnera69ed032010-12-21 12:08:20 +11001092}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093
1094
1095/*
1096 * Log function which is called when an io completes.
1097 *
1098 * The log manager needs its own routine, in order to control what
1099 * happens with the buffer after the write completes.
1100 */
1101void
1102xlog_iodone(xfs_buf_t *bp)
1103{
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05001104 struct xlog_in_core *iclog = bp->b_fspriv;
1105 struct xlog *l = iclog->ic_log;
1106 int aborted = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107
1108 /*
1109 * Race to shutdown the filesystem if we see an error.
1110 */
Chandra Seetharaman5a52c2a582011-07-22 23:39:51 +00001111 if (XFS_TEST_ERROR((xfs_buf_geterror(bp)), l->l_mp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) {
Christoph Hellwig901796a2011-10-10 16:52:49 +00001113 xfs_buf_ioerror_alert(bp, __func__);
Christoph Hellwigc867cb62011-10-10 16:52:46 +00001114 xfs_buf_stale(bp);
Nathan Scott7d04a332006-06-09 14:58:38 +10001115 xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 /*
1117 * This flag will be propagated to the trans-committed
1118 * callback routines to let them know that the log-commit
1119 * didn't succeed.
1120 */
1121 aborted = XFS_LI_ABORTED;
1122 } else if (iclog->ic_state & XLOG_STATE_IOERROR) {
1123 aborted = XFS_LI_ABORTED;
1124 }
David Chinner3db296f2007-05-14 18:24:16 +10001125
1126 /* log I/O is always issued ASYNC */
1127 ASSERT(XFS_BUF_ISASYNC(bp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 xlog_state_done_syncing(iclog, aborted);
David Chinner3db296f2007-05-14 18:24:16 +10001129 /*
1130 * do not reference the buffer (bp) here as we could race
1131 * with it being freed after writing the unmount record to the
1132 * log.
1133 */
Dave Chinnerc3f8fc72012-11-12 22:54:01 +11001134}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135
1136/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 * Return size of each in-core log record buffer.
1138 *
Malcolm Parsons9da096f2009-03-29 09:55:42 +02001139 * All machines get 8 x 32kB buffers by default, unless tuned otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 *
1141 * If the filesystem blocksize is too large, we may need to choose a
1142 * larger size since the directory code currently logs entire blocks.
1143 */
1144
1145STATIC void
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05001146xlog_get_iclog_buffer_size(
1147 struct xfs_mount *mp,
1148 struct xlog *log)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149{
1150 int size;
1151 int xhdrs;
1152
Eric Sandeen1cb51252007-08-16 16:24:43 +10001153 if (mp->m_logbufs <= 0)
1154 log->l_iclog_bufs = XLOG_MAX_ICLOGS;
1155 else
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11001156 log->l_iclog_bufs = mp->m_logbufs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
1158 /*
1159 * Buffer size passed in from mount system call.
1160 */
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11001161 if (mp->m_logbsize > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 size = log->l_iclog_size = mp->m_logbsize;
1163 log->l_iclog_size_log = 0;
1164 while (size != 1) {
1165 log->l_iclog_size_log++;
1166 size >>= 1;
1167 }
1168
Eric Sandeen62118702008-03-06 13:44:28 +11001169 if (xfs_sb_version_haslogv2(&mp->m_sb)) {
Malcolm Parsons9da096f2009-03-29 09:55:42 +02001170 /* # headers = size / 32k
1171 * one header holds cycles from 32k of data
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 */
1173
1174 xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE;
1175 if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE)
1176 xhdrs++;
1177 log->l_iclog_hsize = xhdrs << BBSHIFT;
1178 log->l_iclog_heads = xhdrs;
1179 } else {
1180 ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE);
1181 log->l_iclog_hsize = BBSIZE;
1182 log->l_iclog_heads = 1;
1183 }
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11001184 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 }
1186
Malcolm Parsons9da096f2009-03-29 09:55:42 +02001187 /* All machines use 32kB buffers by default. */
Eric Sandeen1cb51252007-08-16 16:24:43 +10001188 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE;
1189 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190
1191 /* the default log size is 16k or 32k which is one header sector */
1192 log->l_iclog_hsize = BBSIZE;
1193 log->l_iclog_heads = 1;
1194
Christoph Hellwig7153f8b2009-02-09 08:36:46 +01001195done:
1196 /* are we being asked to make the sizes selected above visible? */
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11001197 if (mp->m_logbufs == 0)
1198 mp->m_logbufs = log->l_iclog_bufs;
1199 if (mp->m_logbsize == 0)
1200 mp->m_logbsize = log->l_iclog_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201} /* xlog_get_iclog_buffer_size */
1202
1203
Dave Chinnerf661f1e2012-10-08 21:56:02 +11001204void
1205xfs_log_work_queue(
1206 struct xfs_mount *mp)
1207{
Dave Chinner58896082012-10-08 21:56:05 +11001208 queue_delayed_work(mp->m_log_workqueue, &mp->m_log->l_work,
Dave Chinnerf661f1e2012-10-08 21:56:02 +11001209 msecs_to_jiffies(xfs_syncd_centisecs * 10));
1210}
1211
1212/*
1213 * Every sync period we need to unpin all items in the AIL and push them to
1214 * disk. If there is nothing dirty, then we might need to cover the log to
1215 * indicate that the filesystem is idle.
1216 */
1217void
1218xfs_log_worker(
1219 struct work_struct *work)
1220{
1221 struct xlog *log = container_of(to_delayed_work(work),
1222 struct xlog, l_work);
1223 struct xfs_mount *mp = log->l_mp;
1224
1225 /* dgc: errors ignored - not fatal and nowhere to report them */
1226 if (xfs_log_need_covered(mp))
1227 xfs_fs_log_dummy(mp);
1228 else
1229 xfs_log_force(mp, 0);
1230
1231 /* start pushing all the metadata that is currently dirty */
1232 xfs_ail_push_all(mp->m_ail);
1233
1234 /* queue us up again */
1235 xfs_log_work_queue(mp);
1236}
1237
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238/*
1239 * This routine initializes some of the log structure for a given mount point.
1240 * Its primary purpose is to fill in enough, so recovery can occur. However,
1241 * some other stuff may be filled in too.
1242 */
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05001243STATIC struct xlog *
1244xlog_alloc_log(
1245 struct xfs_mount *mp,
1246 struct xfs_buftarg *log_target,
1247 xfs_daddr_t blk_offset,
1248 int num_bblks)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249{
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05001250 struct xlog *log;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251 xlog_rec_header_t *head;
1252 xlog_in_core_t **iclogp;
1253 xlog_in_core_t *iclog, *prev_iclog=NULL;
1254 xfs_buf_t *bp;
1255 int i;
Dave Chinnera6cb7672009-04-06 18:39:27 +02001256 int error = ENOMEM;
Alex Elder69ce58f2010-04-20 17:09:59 +10001257 uint log2_size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05001259 log = kmem_zalloc(sizeof(struct xlog), KM_MAYFAIL);
Dave Chinnera6cb7672009-04-06 18:39:27 +02001260 if (!log) {
Dave Chinnera0fa2b62011-03-07 10:01:35 +11001261 xfs_warn(mp, "Log allocation failed: No memory!");
Dave Chinnera6cb7672009-04-06 18:39:27 +02001262 goto out;
1263 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264
1265 log->l_mp = mp;
1266 log->l_targ = log_target;
1267 log->l_logsize = BBTOB(num_bblks);
1268 log->l_logBBstart = blk_offset;
1269 log->l_logBBsize = num_bblks;
1270 log->l_covered_state = XLOG_STATE_COVER_IDLE;
1271 log->l_flags |= XLOG_ACTIVE_RECOVERY;
Dave Chinnerf661f1e2012-10-08 21:56:02 +11001272 INIT_DELAYED_WORK(&log->l_work, xfs_log_worker);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273
1274 log->l_prev_block = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */
Dave Chinner1c3cb9e2010-12-21 12:28:39 +11001276 xlog_assign_atomic_lsn(&log->l_tail_lsn, 1, 0);
1277 xlog_assign_atomic_lsn(&log->l_last_sync_lsn, 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 log->l_curr_cycle = 1; /* 0 is bad since this is initial value */
Christoph Hellwigc303c5b2012-02-20 02:31:26 +00001279
1280 xlog_grant_head_init(&log->l_reserve_head);
1281 xlog_grant_head_init(&log->l_write_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282
Dave Chinnera6cb7672009-04-06 18:39:27 +02001283 error = EFSCORRUPTED;
Eric Sandeen62118702008-03-06 13:44:28 +11001284 if (xfs_sb_version_hassector(&mp->m_sb)) {
Alex Elder69ce58f2010-04-20 17:09:59 +10001285 log2_size = mp->m_sb.sb_logsectlog;
1286 if (log2_size < BBSHIFT) {
Dave Chinnera0fa2b62011-03-07 10:01:35 +11001287 xfs_warn(mp, "Log sector size too small (0x%x < 0x%x)",
1288 log2_size, BBSHIFT);
Alex Elder69ce58f2010-04-20 17:09:59 +10001289 goto out_free_log;
1290 }
1291
1292 log2_size -= BBSHIFT;
1293 if (log2_size > mp->m_sectbb_log) {
Dave Chinnera0fa2b62011-03-07 10:01:35 +11001294 xfs_warn(mp, "Log sector size too large (0x%x > 0x%x)",
1295 log2_size, mp->m_sectbb_log);
Dave Chinnera6cb7672009-04-06 18:39:27 +02001296 goto out_free_log;
1297 }
1298
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 /* for larger sector sizes, must have v2 or external log */
Alex Elder69ce58f2010-04-20 17:09:59 +10001300 if (log2_size && log->l_logBBstart > 0 &&
1301 !xfs_sb_version_haslogv2(&mp->m_sb)) {
Dave Chinnera0fa2b62011-03-07 10:01:35 +11001302 xfs_warn(mp,
1303 "log sector size (0x%x) invalid for configuration.",
1304 log2_size);
Dave Chinnera6cb7672009-04-06 18:39:27 +02001305 goto out_free_log;
1306 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 }
Alex Elder69ce58f2010-04-20 17:09:59 +10001308 log->l_sectBBsize = 1 << log2_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309
1310 xlog_get_iclog_buffer_size(mp, log);
1311
Dave Chinnera6cb7672009-04-06 18:39:27 +02001312 error = ENOMEM;
Dave Chinnere70b73f2012-04-23 15:58:49 +10001313 bp = xfs_buf_alloc(mp->m_logdev_targp, 0, BTOBB(log->l_iclog_size), 0);
Dave Chinner644c3562008-11-10 16:50:24 +11001314 if (!bp)
1315 goto out_free_log;
Christoph Hellwigcb669ca2011-07-13 13:43:49 +02001316 bp->b_iodone = xlog_iodone;
Christoph Hellwig0c842ad2011-07-08 14:36:19 +02001317 ASSERT(xfs_buf_islocked(bp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 log->l_xbuf = bp;
1319
Eric Sandeen007c61c2007-10-11 17:43:56 +10001320 spin_lock_init(&log->l_icloglock);
Dave Chinnereb40a872010-12-21 12:09:01 +11001321 init_waitqueue_head(&log->l_flush_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 iclogp = &log->l_iclog;
1324 /*
1325 * The amount of memory to allocate for the iclog structure is
1326 * rather funky due to the way the structure is defined. It is
1327 * done this way so that we can use different sizes for machines
1328 * with different amounts of memory. See the definition of
1329 * xlog_in_core_t in xfs_log_priv.h for details.
1330 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 ASSERT(log->l_iclog_size >= 4096);
1332 for (i=0; i < log->l_iclog_bufs; i++) {
Dave Chinner644c3562008-11-10 16:50:24 +11001333 *iclogp = kmem_zalloc(sizeof(xlog_in_core_t), KM_MAYFAIL);
1334 if (!*iclogp)
1335 goto out_free_iclog;
1336
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 iclog = *iclogp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 iclog->ic_prev = prev_iclog;
1339 prev_iclog = iclog;
Christoph Hellwig1fa40b02007-05-14 18:23:50 +10001340
Dave Chinner686865f2010-09-24 20:07:47 +10001341 bp = xfs_buf_get_uncached(mp->m_logdev_targp,
Dave Chinnere70b73f2012-04-23 15:58:49 +10001342 BTOBB(log->l_iclog_size), 0);
Dave Chinner644c3562008-11-10 16:50:24 +11001343 if (!bp)
1344 goto out_free_iclog;
Christoph Hellwigc8da0fa2011-07-08 14:36:25 +02001345
Christoph Hellwigcb669ca2011-07-13 13:43:49 +02001346 bp->b_iodone = xlog_iodone;
Christoph Hellwig1fa40b02007-05-14 18:23:50 +10001347 iclog->ic_bp = bp;
Christoph Hellwigb28708d2008-11-28 14:23:38 +11001348 iclog->ic_data = bp->b_addr;
David Chinner4679b2d2008-04-10 12:18:54 +10001349#ifdef DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header);
David Chinner4679b2d2008-04-10 12:18:54 +10001351#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 head = &iclog->ic_header;
1353 memset(head, 0, sizeof(xlog_rec_header_t));
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001354 head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM);
1355 head->h_version = cpu_to_be32(
Eric Sandeen62118702008-03-06 13:44:28 +11001356 xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? 2 : 1);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001357 head->h_size = cpu_to_be32(log->l_iclog_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 /* new fields */
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001359 head->h_fmt = cpu_to_be32(XLOG_FMT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t));
1361
Dave Chinner4e94b712012-04-23 15:58:51 +10001362 iclog->ic_size = BBTOB(bp->b_length) - log->l_iclog_hsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 iclog->ic_state = XLOG_STATE_ACTIVE;
1364 iclog->ic_log = log;
David Chinner114d23a2008-04-10 12:18:39 +10001365 atomic_set(&iclog->ic_refcnt, 0);
1366 spin_lock_init(&iclog->ic_callback_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 iclog->ic_callback_tail = &(iclog->ic_callback);
Christoph Hellwigb28708d2008-11-28 14:23:38 +11001368 iclog->ic_datap = (char *)iclog->ic_data + log->l_iclog_hsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369
Christoph Hellwig0c842ad2011-07-08 14:36:19 +02001370 ASSERT(xfs_buf_islocked(iclog->ic_bp));
Dave Chinnereb40a872010-12-21 12:09:01 +11001371 init_waitqueue_head(&iclog->ic_force_wait);
1372 init_waitqueue_head(&iclog->ic_write_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373
1374 iclogp = &iclog->ic_next;
1375 }
1376 *iclogp = log->l_iclog; /* complete ring */
1377 log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */
1378
Dave Chinner71e330b2010-05-21 14:37:18 +10001379 error = xlog_cil_init(log);
1380 if (error)
1381 goto out_free_iclog;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 return log;
Dave Chinner644c3562008-11-10 16:50:24 +11001383
1384out_free_iclog:
1385 for (iclog = log->l_iclog; iclog; iclog = prev_iclog) {
1386 prev_iclog = iclog->ic_next;
Dave Chinnereb40a872010-12-21 12:09:01 +11001387 if (iclog->ic_bp)
Dave Chinner644c3562008-11-10 16:50:24 +11001388 xfs_buf_free(iclog->ic_bp);
Dave Chinner644c3562008-11-10 16:50:24 +11001389 kmem_free(iclog);
1390 }
1391 spinlock_destroy(&log->l_icloglock);
Dave Chinner644c3562008-11-10 16:50:24 +11001392 xfs_buf_free(log->l_xbuf);
1393out_free_log:
1394 kmem_free(log);
Dave Chinnera6cb7672009-04-06 18:39:27 +02001395out:
1396 return ERR_PTR(-error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397} /* xlog_alloc_log */
1398
1399
1400/*
1401 * Write out the commit record of a transaction associated with the given
1402 * ticket. Return the lsn of the commit record.
1403 */
1404STATIC int
Dave Chinner55b66332010-03-23 11:43:17 +11001405xlog_commit_record(
Mark Tinguelyad223e62012-06-14 09:22:15 -05001406 struct xlog *log,
Dave Chinner55b66332010-03-23 11:43:17 +11001407 struct xlog_ticket *ticket,
1408 struct xlog_in_core **iclog,
1409 xfs_lsn_t *commitlsnp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410{
Dave Chinner55b66332010-03-23 11:43:17 +11001411 struct xfs_mount *mp = log->l_mp;
1412 int error;
1413 struct xfs_log_iovec reg = {
1414 .i_addr = NULL,
1415 .i_len = 0,
1416 .i_type = XLOG_REG_TYPE_COMMIT,
1417 };
1418 struct xfs_log_vec vec = {
1419 .lv_niovecs = 1,
1420 .lv_iovecp = &reg,
1421 };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422
1423 ASSERT_ALWAYS(iclog);
Dave Chinner55b66332010-03-23 11:43:17 +11001424 error = xlog_write(log, &vec, ticket, commitlsnp, iclog,
1425 XLOG_COMMIT_TRANS);
1426 if (error)
Nathan Scott7d04a332006-06-09 14:58:38 +10001427 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
Jesper Juhl014c2542006-01-15 02:37:08 +01001428 return error;
Dave Chinner55b66332010-03-23 11:43:17 +11001429}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430
1431/*
1432 * Push on the buffer cache code if we ever use more than 75% of the on-disk
1433 * log space. This code pushes on the lsn which would supposedly free up
1434 * the 25% which we want to leave free. We may need to adopt a policy which
1435 * pushes on an lsn which is further along in the log once we reach the high
1436 * water mark. In this manner, we would be creating a low water mark.
1437 */
David Chinnera8272ce2007-11-23 16:28:09 +11001438STATIC void
Dave Chinner2ced19c2010-12-21 12:09:20 +11001439xlog_grant_push_ail(
Mark Tinguelyad223e62012-06-14 09:22:15 -05001440 struct xlog *log,
Dave Chinner2ced19c2010-12-21 12:09:20 +11001441 int need_bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442{
Dave Chinner2ced19c2010-12-21 12:09:20 +11001443 xfs_lsn_t threshold_lsn = 0;
Dave Chinner84f3c682010-12-03 22:11:29 +11001444 xfs_lsn_t last_sync_lsn;
Dave Chinner2ced19c2010-12-21 12:09:20 +11001445 int free_blocks;
1446 int free_bytes;
1447 int threshold_block;
1448 int threshold_cycle;
1449 int free_threshold;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450
Dave Chinner2ced19c2010-12-21 12:09:20 +11001451 ASSERT(BTOBB(need_bytes) < log->l_logBBsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452
Christoph Hellwig28496962012-02-20 02:31:25 +00001453 free_bytes = xlog_space_left(log, &log->l_reserve_head.grant);
Dave Chinner2ced19c2010-12-21 12:09:20 +11001454 free_blocks = BTOBBT(free_bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455
Dave Chinner2ced19c2010-12-21 12:09:20 +11001456 /*
1457 * Set the threshold for the minimum number of free blocks in the
1458 * log to the maximum of what the caller needs, one quarter of the
1459 * log, and 256 blocks.
1460 */
1461 free_threshold = BTOBB(need_bytes);
1462 free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2));
1463 free_threshold = MAX(free_threshold, 256);
1464 if (free_blocks >= free_threshold)
1465 return;
1466
Dave Chinner1c3cb9e2010-12-21 12:28:39 +11001467 xlog_crack_atomic_lsn(&log->l_tail_lsn, &threshold_cycle,
1468 &threshold_block);
1469 threshold_block += free_threshold;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 if (threshold_block >= log->l_logBBsize) {
Dave Chinner2ced19c2010-12-21 12:09:20 +11001471 threshold_block -= log->l_logBBsize;
1472 threshold_cycle += 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 }
Dave Chinner2ced19c2010-12-21 12:09:20 +11001474 threshold_lsn = xlog_assign_lsn(threshold_cycle,
1475 threshold_block);
1476 /*
1477 * Don't pass in an lsn greater than the lsn of the last
Dave Chinner84f3c682010-12-03 22:11:29 +11001478 * log record known to be on disk. Use a snapshot of the last sync lsn
1479 * so that it doesn't change between the compare and the set.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 */
Dave Chinner84f3c682010-12-03 22:11:29 +11001481 last_sync_lsn = atomic64_read(&log->l_last_sync_lsn);
1482 if (XFS_LSN_CMP(threshold_lsn, last_sync_lsn) > 0)
1483 threshold_lsn = last_sync_lsn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484
Dave Chinner2ced19c2010-12-21 12:09:20 +11001485 /*
1486 * Get the transaction layer to kick the dirty buffers out to
1487 * disk asynchronously. No point in trying to do this if
1488 * the filesystem is shutting down.
1489 */
1490 if (!XLOG_FORCED_SHUTDOWN(log))
Dave Chinnerfd074842011-04-08 12:45:07 +10001491 xfs_ail_push(log->l_ailp, threshold_lsn);
Dave Chinner2ced19c2010-12-21 12:09:20 +11001492}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493
Christoph Hellwig873ff552010-01-13 22:17:57 +00001494/*
Christoph Hellwig0e446be2012-11-12 22:54:24 +11001495 * Stamp cycle number in every block
1496 */
1497STATIC void
1498xlog_pack_data(
1499 struct xlog *log,
1500 struct xlog_in_core *iclog,
1501 int roundoff)
1502{
1503 int i, j, k;
1504 int size = iclog->ic_offset + roundoff;
1505 __be32 cycle_lsn;
1506 xfs_caddr_t dp;
1507
1508 cycle_lsn = CYCLE_LSN_DISK(iclog->ic_header.h_lsn);
1509
1510 dp = iclog->ic_datap;
1511 for (i = 0; i < BTOBB(size); i++) {
1512 if (i >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE))
1513 break;
1514 iclog->ic_header.h_cycle_data[i] = *(__be32 *)dp;
1515 *(__be32 *)dp = cycle_lsn;
1516 dp += BBSIZE;
1517 }
1518
1519 if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) {
1520 xlog_in_core_2_t *xhdr = iclog->ic_data;
1521
1522 for ( ; i < BTOBB(size); i++) {
1523 j = i / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
1524 k = i % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
1525 xhdr[j].hic_xheader.xh_cycle_data[k] = *(__be32 *)dp;
1526 *(__be32 *)dp = cycle_lsn;
1527 dp += BBSIZE;
1528 }
1529
1530 for (i = 1; i < log->l_iclog_heads; i++)
1531 xhdr[i].hic_xheader.xh_cycle = cycle_lsn;
1532 }
1533}
1534
1535/*
1536 * Calculate the checksum for a log buffer.
1537 *
1538 * This is a little more complicated than it should be because the various
1539 * headers and the actual data are non-contiguous.
1540 */
Dave Chinnerf9668a02012-11-28 13:01:03 +11001541__le32
Christoph Hellwig0e446be2012-11-12 22:54:24 +11001542xlog_cksum(
1543 struct xlog *log,
1544 struct xlog_rec_header *rhead,
1545 char *dp,
1546 int size)
1547{
1548 __uint32_t crc;
1549
1550 /* first generate the crc for the record header ... */
1551 crc = xfs_start_cksum((char *)rhead,
1552 sizeof(struct xlog_rec_header),
1553 offsetof(struct xlog_rec_header, h_crc));
1554
1555 /* ... then for additional cycle data for v2 logs ... */
1556 if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) {
1557 union xlog_in_core2 *xhdr = (union xlog_in_core2 *)rhead;
1558 int i;
1559
1560 for (i = 1; i < log->l_iclog_heads; i++) {
1561 crc = crc32c(crc, &xhdr[i].hic_xheader,
1562 sizeof(struct xlog_rec_ext_header));
1563 }
1564 }
1565
1566 /* ... and finally for the payload */
1567 crc = crc32c(crc, dp, size);
1568
1569 return xfs_end_cksum(crc);
1570}
1571
1572/*
Christoph Hellwig873ff552010-01-13 22:17:57 +00001573 * The bdstrat callback function for log bufs. This gives us a central
1574 * place to trap bufs in case we get hit by a log I/O error and need to
1575 * shutdown. Actually, in practice, even when we didn't get a log error,
1576 * we transition the iclogs to IOERROR state *after* flushing all existing
1577 * iclogs to disk. This is because we don't want anymore new transactions to be
1578 * started or completed afterwards.
1579 */
1580STATIC int
1581xlog_bdstrat(
1582 struct xfs_buf *bp)
1583{
Christoph Hellwigadadbee2011-07-13 13:43:49 +02001584 struct xlog_in_core *iclog = bp->b_fspriv;
Christoph Hellwig873ff552010-01-13 22:17:57 +00001585
Christoph Hellwig873ff552010-01-13 22:17:57 +00001586 if (iclog->ic_state & XLOG_STATE_IOERROR) {
Chandra Seetharaman5a52c2a582011-07-22 23:39:51 +00001587 xfs_buf_ioerror(bp, EIO);
Christoph Hellwigc867cb62011-10-10 16:52:46 +00001588 xfs_buf_stale(bp);
Christoph Hellwig1a1a3e92010-10-06 18:41:18 +00001589 xfs_buf_ioend(bp, 0);
Christoph Hellwig873ff552010-01-13 22:17:57 +00001590 /*
1591 * It would seem logical to return EIO here, but we rely on
1592 * the log state machine to propagate I/O errors instead of
1593 * doing it here.
1594 */
1595 return 0;
1596 }
1597
Christoph Hellwig873ff552010-01-13 22:17:57 +00001598 xfs_buf_iorequest(bp);
1599 return 0;
1600}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601
1602/*
1603 * Flush out the in-core log (iclog) to the on-disk log in an asynchronous
1604 * fashion. Previously, we should have moved the current iclog
1605 * ptr in the log to point to the next available iclog. This allows further
1606 * write to continue while this code syncs out an iclog ready to go.
1607 * Before an in-core log can be written out, the data section must be scanned
1608 * to save away the 1st word of each BBSIZE block into the header. We replace
1609 * it with the current cycle count. Each BBSIZE block is tagged with the
1610 * cycle count because there in an implicit assumption that drives will
1611 * guarantee that entire 512 byte blocks get written at once. In other words,
1612 * we can't have part of a 512 byte block written and part not written. By
1613 * tagging each block, we will know which blocks are valid when recovering
1614 * after an unclean shutdown.
1615 *
1616 * This routine is single threaded on the iclog. No other thread can be in
1617 * this routine with the same iclog. Changing contents of iclog can there-
1618 * fore be done without grabbing the state machine lock. Updating the global
1619 * log will require grabbing the lock though.
1620 *
1621 * The entire log manager uses a logical block numbering scheme. Only
1622 * log_sync (and then only bwrite()) know about the fact that the log may
1623 * not start with block zero on a given device. The log block start offset
1624 * is added immediately before calling bwrite().
1625 */
1626
David Chinnera8272ce2007-11-23 16:28:09 +11001627STATIC int
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05001628xlog_sync(
1629 struct xlog *log,
1630 struct xlog_in_core *iclog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632 xfs_buf_t *bp;
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001633 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 uint count; /* byte count of bwrite */
1635 uint count_init; /* initial count before roundup */
1636 int roundoff; /* roundoff to BB or stripe */
1637 int split = 0; /* split write into two regions */
1638 int error;
Eric Sandeen62118702008-03-06 13:44:28 +11001639 int v2 = xfs_sb_version_haslogv2(&log->l_mp->m_sb);
Christoph Hellwig0e446be2012-11-12 22:54:24 +11001640 int size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641
1642 XFS_STATS_INC(xs_log_writes);
David Chinner155cc6b2008-03-06 13:44:14 +11001643 ASSERT(atomic_read(&iclog->ic_refcnt) == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001644
1645 /* Add for LR header */
1646 count_init = log->l_iclog_hsize + iclog->ic_offset;
1647
1648 /* Round out the log write size */
1649 if (v2 && log->l_mp->m_sb.sb_logsunit > 1) {
1650 /* we have a v2 stripe unit to use */
1651 count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init));
1652 } else {
1653 count = BBTOB(BTOBB(count_init));
1654 }
1655 roundoff = count - count_init;
1656 ASSERT(roundoff >= 0);
1657 ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 &&
1658 roundoff < log->l_mp->m_sb.sb_logsunit)
1659 ||
1660 (log->l_mp->m_sb.sb_logsunit <= 1 &&
1661 roundoff < BBTOB(1)));
1662
1663 /* move grant heads by roundoff in sync */
Christoph Hellwig28496962012-02-20 02:31:25 +00001664 xlog_grant_add_space(log, &log->l_reserve_head.grant, roundoff);
1665 xlog_grant_add_space(log, &log->l_write_head.grant, roundoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666
1667 /* put cycle number in every block */
1668 xlog_pack_data(log, iclog, roundoff);
1669
1670 /* real byte length */
Christoph Hellwig0e446be2012-11-12 22:54:24 +11001671 size = iclog->ic_offset;
1672 if (v2)
1673 size += roundoff;
1674 iclog->ic_header.h_len = cpu_to_be32(size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675
Nathan Scottf5faad72006-07-28 17:04:44 +10001676 bp = iclog->ic_bp;
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001677 XFS_BUF_SET_ADDR(bp, BLOCK_LSN(be64_to_cpu(iclog->ic_header.h_lsn)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678
1679 XFS_STATS_ADD(xs_log_blocks, BTOBB(count));
1680
1681 /* Do we need to split this write into 2 parts? */
1682 if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) {
Christoph Hellwig0e446be2012-11-12 22:54:24 +11001683 char *dptr;
1684
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685 split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)));
1686 count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp));
Christoph Hellwig0e446be2012-11-12 22:54:24 +11001687 iclog->ic_bwritecnt = 2;
1688
1689 /*
1690 * Bump the cycle numbers at the start of each block in the
1691 * part of the iclog that ends up in the buffer that gets
1692 * written to the start of the log.
1693 *
1694 * Watch out for the header magic number case, though.
1695 */
1696 dptr = (char *)&iclog->ic_header + count;
1697 for (i = 0; i < split; i += BBSIZE) {
1698 __uint32_t cycle = be32_to_cpu(*(__be32 *)dptr);
1699 if (++cycle == XLOG_HEADER_MAGIC_NUM)
1700 cycle++;
1701 *(__be32 *)dptr = cpu_to_be32(cycle);
1702
1703 dptr += BBSIZE;
1704 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705 } else {
1706 iclog->ic_bwritecnt = 1;
1707 }
Christoph Hellwig0e446be2012-11-12 22:54:24 +11001708
1709 /* calculcate the checksum */
1710 iclog->ic_header.h_crc = xlog_cksum(log, &iclog->ic_header,
1711 iclog->ic_datap, size);
1712
Dave Chinneraa0e8832012-04-23 15:58:52 +10001713 bp->b_io_length = BTOBB(count);
Christoph Hellwigadadbee2011-07-13 13:43:49 +02001714 bp->b_fspriv = iclog;
Nathan Scottf5faad72006-07-28 17:04:44 +10001715 XFS_BUF_ZEROFLAGS(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716 XFS_BUF_ASYNC(bp);
Christoph Hellwig1d5ae5d2011-07-08 14:36:32 +02001717 bp->b_flags |= XBF_SYNCIO;
Christoph Hellwig651701d2010-06-28 10:34:34 -04001718
Christoph Hellwiga27a2632011-06-16 12:02:23 +00001719 if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) {
Christoph Hellwige163cbd2011-07-08 14:36:36 +02001720 bp->b_flags |= XBF_FUA;
1721
Christoph Hellwiga27a2632011-06-16 12:02:23 +00001722 /*
Christoph Hellwige163cbd2011-07-08 14:36:36 +02001723 * Flush the data device before flushing the log to make
1724 * sure all meta data written back from the AIL actually made
1725 * it to disk before stamping the new log tail LSN into the
1726 * log buffer. For an external log we need to issue the
1727 * flush explicitly, and unfortunately synchronously here;
1728 * for an internal log we can simply use the block layer
1729 * state machine for preflushes.
Christoph Hellwiga27a2632011-06-16 12:02:23 +00001730 */
1731 if (log->l_mp->m_logdev_targp != log->l_mp->m_ddev_targp)
1732 xfs_blkdev_issue_flush(log->l_mp->m_ddev_targp);
Christoph Hellwige163cbd2011-07-08 14:36:36 +02001733 else
1734 bp->b_flags |= XBF_FLUSH;
Christoph Hellwiga27a2632011-06-16 12:02:23 +00001735 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736
1737 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1);
1738 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize);
1739
Ben Myers003fd6c2013-01-18 14:17:46 -06001740 xlog_verify_iclog(log, iclog, count, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741
1742 /* account for log which doesn't start at block #0 */
1743 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart);
1744 /*
1745 * Don't call xfs_bwrite here. We do log-syncs even when the filesystem
1746 * is shutting down.
1747 */
1748 XFS_BUF_WRITE(bp);
1749
Christoph Hellwig901796a2011-10-10 16:52:49 +00001750 error = xlog_bdstrat(bp);
1751 if (error) {
1752 xfs_buf_ioerror_alert(bp, "xlog_sync");
Jesper Juhl014c2542006-01-15 02:37:08 +01001753 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 }
1755 if (split) {
Nathan Scottf5faad72006-07-28 17:04:44 +10001756 bp = iclog->ic_log->l_xbuf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757 XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */
Chandra Seetharaman02fe03d2011-07-22 23:40:22 +00001758 xfs_buf_associate_memory(bp,
1759 (char *)&iclog->ic_header + count, split);
Christoph Hellwigadadbee2011-07-13 13:43:49 +02001760 bp->b_fspriv = iclog;
Nathan Scottf5faad72006-07-28 17:04:44 +10001761 XFS_BUF_ZEROFLAGS(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001762 XFS_BUF_ASYNC(bp);
Christoph Hellwig1d5ae5d2011-07-08 14:36:32 +02001763 bp->b_flags |= XBF_SYNCIO;
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11001764 if (log->l_mp->m_flags & XFS_MOUNT_BARRIER)
Christoph Hellwige163cbd2011-07-08 14:36:36 +02001765 bp->b_flags |= XBF_FUA;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766
1767 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1);
1768 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize);
1769
Nathan Scottc41564b2006-03-29 08:55:14 +10001770 /* account for internal log which doesn't start at block #0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart);
1772 XFS_BUF_WRITE(bp);
Christoph Hellwig901796a2011-10-10 16:52:49 +00001773 error = xlog_bdstrat(bp);
1774 if (error) {
1775 xfs_buf_ioerror_alert(bp, "xlog_sync (split)");
Jesper Juhl014c2542006-01-15 02:37:08 +01001776 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 }
1778 }
Jesper Juhl014c2542006-01-15 02:37:08 +01001779 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780} /* xlog_sync */
1781
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782/*
Nathan Scottc41564b2006-03-29 08:55:14 +10001783 * Deallocate a log structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784 */
David Chinnera8272ce2007-11-23 16:28:09 +11001785STATIC void
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05001786xlog_dealloc_log(
1787 struct xlog *log)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788{
1789 xlog_in_core_t *iclog, *next_iclog;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001790 int i;
1791
Dave Chinner71e330b2010-05-21 14:37:18 +10001792 xlog_cil_destroy(log);
1793
Dave Chinner44396472011-04-21 09:34:27 +00001794 /*
1795 * always need to ensure that the extra buffer does not point to memory
1796 * owned by another log buffer before we free it.
1797 */
Dave Chinnere70b73f2012-04-23 15:58:49 +10001798 xfs_buf_set_empty(log->l_xbuf, BTOBB(log->l_iclog_size));
Dave Chinner44396472011-04-21 09:34:27 +00001799 xfs_buf_free(log->l_xbuf);
1800
Linus Torvalds1da177e2005-04-16 15:20:36 -07001801 iclog = log->l_iclog;
1802 for (i=0; i<log->l_iclog_bufs; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803 xfs_buf_free(iclog->ic_bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 next_iclog = iclog->ic_next;
Denys Vlasenkof0e2d932008-05-19 16:31:57 +10001805 kmem_free(iclog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806 iclog = next_iclog;
1807 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808 spinlock_destroy(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810 log->l_mp->m_log = NULL;
Denys Vlasenkof0e2d932008-05-19 16:31:57 +10001811 kmem_free(log);
Nathan Scottc41564b2006-03-29 08:55:14 +10001812} /* xlog_dealloc_log */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813
1814/*
1815 * Update counters atomically now that memcpy is done.
1816 */
1817/* ARGSUSED */
1818static inline void
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05001819xlog_state_finish_copy(
1820 struct xlog *log,
1821 struct xlog_in_core *iclog,
1822 int record_cnt,
1823 int copy_bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824{
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10001825 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826
Marcin Slusarz413d57c2008-02-13 15:03:29 -08001827 be32_add_cpu(&iclog->ic_header.h_num_logops, record_cnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828 iclog->ic_offset += copy_bytes;
1829
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10001830 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831} /* xlog_state_finish_copy */
1832
1833
1834
1835
1836/*
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001837 * print out info relating to regions written which consume
1838 * the reservation
1839 */
Dave Chinner71e330b2010-05-21 14:37:18 +10001840void
1841xlog_print_tic_res(
1842 struct xfs_mount *mp,
1843 struct xlog_ticket *ticket)
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001844{
1845 uint i;
1846 uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t);
1847
1848 /* match with XLOG_REG_TYPE_* in xfs_log.h */
1849 static char *res_type_str[XLOG_REG_TYPE_MAX] = {
1850 "bformat",
1851 "bchunk",
1852 "efi_format",
1853 "efd_format",
1854 "iformat",
1855 "icore",
1856 "iext",
1857 "ibroot",
1858 "ilocal",
1859 "iattr_ext",
1860 "iattr_broot",
1861 "iattr_local",
1862 "qformat",
1863 "dquot",
1864 "quotaoff",
1865 "LR header",
1866 "unmount",
1867 "commit",
1868 "trans header"
1869 };
1870 static char *trans_type_str[XFS_TRANS_TYPE_MAX] = {
1871 "SETATTR_NOT_SIZE",
1872 "SETATTR_SIZE",
1873 "INACTIVE",
1874 "CREATE",
1875 "CREATE_TRUNC",
1876 "TRUNCATE_FILE",
1877 "REMOVE",
1878 "LINK",
1879 "RENAME",
1880 "MKDIR",
1881 "RMDIR",
1882 "SYMLINK",
1883 "SET_DMATTRS",
1884 "GROWFS",
1885 "STRAT_WRITE",
1886 "DIOSTRAT",
1887 "WRITE_SYNC",
1888 "WRITEID",
1889 "ADDAFORK",
1890 "ATTRINVAL",
1891 "ATRUNCATE",
1892 "ATTR_SET",
1893 "ATTR_RM",
1894 "ATTR_FLAG",
1895 "CLEAR_AGI_BUCKET",
1896 "QM_SBCHANGE",
1897 "DUMMY1",
1898 "DUMMY2",
1899 "QM_QUOTAOFF",
1900 "QM_DQALLOC",
1901 "QM_SETQLIM",
1902 "QM_DQCLUSTER",
1903 "QM_QINOCREATE",
1904 "QM_QUOTAOFF_END",
1905 "SB_UNIT",
1906 "FSYNC_TS",
1907 "GROWFSRT_ALLOC",
1908 "GROWFSRT_ZERO",
1909 "GROWFSRT_FREE",
1910 "SWAPEXT"
1911 };
1912
Dave Chinnera0fa2b62011-03-07 10:01:35 +11001913 xfs_warn(mp,
Christoph Hellwig93b8a582011-12-06 21:58:07 +00001914 "xlog_write: reservation summary:\n"
Dave Chinnera0fa2b62011-03-07 10:01:35 +11001915 " trans type = %s (%u)\n"
1916 " unit res = %d bytes\n"
1917 " current res = %d bytes\n"
1918 " total reg = %u bytes (o/flow = %u bytes)\n"
1919 " ophdrs = %u (ophdr space = %u bytes)\n"
1920 " ophdr + reg = %u bytes\n"
1921 " num regions = %u\n",
1922 ((ticket->t_trans_type <= 0 ||
1923 ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ?
1924 "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]),
1925 ticket->t_trans_type,
1926 ticket->t_unit_res,
1927 ticket->t_curr_res,
1928 ticket->t_res_arr_sum, ticket->t_res_o_flow,
1929 ticket->t_res_num_ophdrs, ophdr_spc,
1930 ticket->t_res_arr_sum +
1931 ticket->t_res_o_flow + ophdr_spc,
1932 ticket->t_res_num);
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001933
1934 for (i = 0; i < ticket->t_res_num; i++) {
Dave Chinnera0fa2b62011-03-07 10:01:35 +11001935 uint r_type = ticket->t_res_arr[i].r_type;
1936 xfs_warn(mp, "region[%u]: %s - %u bytes\n", i,
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001937 ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ?
1938 "bad-rtype" : res_type_str[r_type-1]),
1939 ticket->t_res_arr[i].r_len);
1940 }
Dave Chinner169a7b02010-05-07 11:05:31 +10001941
Dave Chinnera0fa2b62011-03-07 10:01:35 +11001942 xfs_alert_tag(mp, XFS_PTAG_LOGRES,
Christoph Hellwig93b8a582011-12-06 21:58:07 +00001943 "xlog_write: reservation ran out. Need to up reservation");
Dave Chinner169a7b02010-05-07 11:05:31 +10001944 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001945}
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001946
1947/*
Dave Chinnerb5203cd2010-03-23 11:29:44 +11001948 * Calculate the potential space needed by the log vector. Each region gets
1949 * its own xlog_op_header_t and may need to be double word aligned.
1950 */
1951static int
1952xlog_write_calc_vec_length(
1953 struct xlog_ticket *ticket,
Dave Chinner55b66332010-03-23 11:43:17 +11001954 struct xfs_log_vec *log_vector)
Dave Chinnerb5203cd2010-03-23 11:29:44 +11001955{
Dave Chinner55b66332010-03-23 11:43:17 +11001956 struct xfs_log_vec *lv;
Dave Chinnerb5203cd2010-03-23 11:29:44 +11001957 int headers = 0;
1958 int len = 0;
1959 int i;
1960
1961 /* acct for start rec of xact */
1962 if (ticket->t_flags & XLOG_TIC_INITED)
1963 headers++;
1964
Dave Chinner55b66332010-03-23 11:43:17 +11001965 for (lv = log_vector; lv; lv = lv->lv_next) {
Dave Chinnerfd638752013-06-27 16:04:51 +10001966 /* we don't write ordered log vectors */
1967 if (lv->lv_buf_len == XFS_LOG_VEC_ORDERED)
1968 continue;
1969
Dave Chinner55b66332010-03-23 11:43:17 +11001970 headers += lv->lv_niovecs;
Dave Chinnerb5203cd2010-03-23 11:29:44 +11001971
Dave Chinner55b66332010-03-23 11:43:17 +11001972 for (i = 0; i < lv->lv_niovecs; i++) {
1973 struct xfs_log_iovec *vecp = &lv->lv_iovecp[i];
1974
1975 len += vecp->i_len;
1976 xlog_tic_add_region(ticket, vecp->i_len, vecp->i_type);
1977 }
Dave Chinnerb5203cd2010-03-23 11:29:44 +11001978 }
1979
1980 ticket->t_res_num_ophdrs += headers;
1981 len += headers * sizeof(struct xlog_op_header);
1982
1983 return len;
1984}
1985
1986/*
1987 * If first write for transaction, insert start record We can't be trying to
1988 * commit if we are inited. We can't have any "partial_copy" if we are inited.
1989 */
1990static int
1991xlog_write_start_rec(
Christoph Hellwige6b1f272010-03-23 11:47:38 +11001992 struct xlog_op_header *ophdr,
Dave Chinnerb5203cd2010-03-23 11:29:44 +11001993 struct xlog_ticket *ticket)
1994{
Dave Chinnerb5203cd2010-03-23 11:29:44 +11001995 if (!(ticket->t_flags & XLOG_TIC_INITED))
1996 return 0;
1997
1998 ophdr->oh_tid = cpu_to_be32(ticket->t_tid);
1999 ophdr->oh_clientid = ticket->t_clientid;
2000 ophdr->oh_len = 0;
2001 ophdr->oh_flags = XLOG_START_TRANS;
2002 ophdr->oh_res2 = 0;
2003
2004 ticket->t_flags &= ~XLOG_TIC_INITED;
2005
2006 return sizeof(struct xlog_op_header);
2007}
2008
2009static xlog_op_header_t *
2010xlog_write_setup_ophdr(
Mark Tinguelyad223e62012-06-14 09:22:15 -05002011 struct xlog *log,
Christoph Hellwige6b1f272010-03-23 11:47:38 +11002012 struct xlog_op_header *ophdr,
Dave Chinnerb5203cd2010-03-23 11:29:44 +11002013 struct xlog_ticket *ticket,
2014 uint flags)
2015{
Dave Chinnerb5203cd2010-03-23 11:29:44 +11002016 ophdr->oh_tid = cpu_to_be32(ticket->t_tid);
2017 ophdr->oh_clientid = ticket->t_clientid;
2018 ophdr->oh_res2 = 0;
2019
2020 /* are we copying a commit or unmount record? */
2021 ophdr->oh_flags = flags;
2022
2023 /*
2024 * We've seen logs corrupted with bad transaction client ids. This
2025 * makes sure that XFS doesn't generate them on. Turn this into an EIO
2026 * and shut down the filesystem.
2027 */
2028 switch (ophdr->oh_clientid) {
2029 case XFS_TRANSACTION:
2030 case XFS_VOLUME:
2031 case XFS_LOG:
2032 break;
2033 default:
Dave Chinnera0fa2b62011-03-07 10:01:35 +11002034 xfs_warn(log->l_mp,
Dave Chinnerb5203cd2010-03-23 11:29:44 +11002035 "Bad XFS transaction clientid 0x%x in ticket 0x%p",
2036 ophdr->oh_clientid, ticket);
2037 return NULL;
2038 }
2039
2040 return ophdr;
2041}
2042
2043/*
2044 * Set up the parameters of the region copy into the log. This has
2045 * to handle region write split across multiple log buffers - this
2046 * state is kept external to this function so that this code can
2047 * can be written in an obvious, self documenting manner.
2048 */
2049static int
2050xlog_write_setup_copy(
2051 struct xlog_ticket *ticket,
2052 struct xlog_op_header *ophdr,
2053 int space_available,
2054 int space_required,
2055 int *copy_off,
2056 int *copy_len,
2057 int *last_was_partial_copy,
2058 int *bytes_consumed)
2059{
2060 int still_to_copy;
2061
2062 still_to_copy = space_required - *bytes_consumed;
2063 *copy_off = *bytes_consumed;
2064
2065 if (still_to_copy <= space_available) {
2066 /* write of region completes here */
2067 *copy_len = still_to_copy;
2068 ophdr->oh_len = cpu_to_be32(*copy_len);
2069 if (*last_was_partial_copy)
2070 ophdr->oh_flags |= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS);
2071 *last_was_partial_copy = 0;
2072 *bytes_consumed = 0;
2073 return 0;
2074 }
2075
2076 /* partial write of region, needs extra log op header reservation */
2077 *copy_len = space_available;
2078 ophdr->oh_len = cpu_to_be32(*copy_len);
2079 ophdr->oh_flags |= XLOG_CONTINUE_TRANS;
2080 if (*last_was_partial_copy)
2081 ophdr->oh_flags |= XLOG_WAS_CONT_TRANS;
2082 *bytes_consumed += *copy_len;
2083 (*last_was_partial_copy)++;
2084
2085 /* account for new log op header */
2086 ticket->t_curr_res -= sizeof(struct xlog_op_header);
2087 ticket->t_res_num_ophdrs++;
2088
2089 return sizeof(struct xlog_op_header);
2090}
2091
2092static int
2093xlog_write_copy_finish(
Mark Tinguelyad223e62012-06-14 09:22:15 -05002094 struct xlog *log,
Dave Chinnerb5203cd2010-03-23 11:29:44 +11002095 struct xlog_in_core *iclog,
2096 uint flags,
2097 int *record_cnt,
2098 int *data_cnt,
2099 int *partial_copy,
2100 int *partial_copy_len,
2101 int log_offset,
2102 struct xlog_in_core **commit_iclog)
2103{
2104 if (*partial_copy) {
2105 /*
2106 * This iclog has already been marked WANT_SYNC by
2107 * xlog_state_get_iclog_space.
2108 */
2109 xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt);
2110 *record_cnt = 0;
2111 *data_cnt = 0;
2112 return xlog_state_release_iclog(log, iclog);
2113 }
2114
2115 *partial_copy = 0;
2116 *partial_copy_len = 0;
2117
2118 if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) {
2119 /* no more space in this iclog - push it. */
2120 xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt);
2121 *record_cnt = 0;
2122 *data_cnt = 0;
2123
2124 spin_lock(&log->l_icloglock);
2125 xlog_state_want_sync(log, iclog);
2126 spin_unlock(&log->l_icloglock);
2127
2128 if (!commit_iclog)
2129 return xlog_state_release_iclog(log, iclog);
2130 ASSERT(flags & XLOG_COMMIT_TRANS);
2131 *commit_iclog = iclog;
2132 }
2133
2134 return 0;
2135}
2136
2137/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002138 * Write some region out to in-core log
2139 *
2140 * This will be called when writing externally provided regions or when
2141 * writing out a commit record for a given transaction.
2142 *
2143 * General algorithm:
2144 * 1. Find total length of this write. This may include adding to the
2145 * lengths passed in.
2146 * 2. Check whether we violate the tickets reservation.
2147 * 3. While writing to this iclog
2148 * A. Reserve as much space in this iclog as can get
2149 * B. If this is first write, save away start lsn
2150 * C. While writing this region:
2151 * 1. If first write of transaction, write start record
2152 * 2. Write log operation header (header per region)
2153 * 3. Find out if we can fit entire region into this iclog
2154 * 4. Potentially, verify destination memcpy ptr
2155 * 5. Memcpy (partial) region
2156 * 6. If partial copy, release iclog; otherwise, continue
2157 * copying more regions into current iclog
2158 * 4. Mark want sync bit (in simulation mode)
2159 * 5. Release iclog for potential flush to on-disk log.
2160 *
2161 * ERRORS:
2162 * 1. Panic if reservation is overrun. This should never happen since
2163 * reservation amounts are generated internal to the filesystem.
2164 * NOTES:
2165 * 1. Tickets are single threaded data structures.
2166 * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the
2167 * syncing routine. When a single log_write region needs to span
2168 * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set
2169 * on all log operation writes which don't contain the end of the
2170 * region. The XLOG_END_TRANS bit is used for the in-core log
2171 * operation which contains the end of the continued log_write region.
2172 * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog,
2173 * we don't really know exactly how much space will be used. As a result,
2174 * we don't update ic_offset until the end when we know exactly how many
2175 * bytes have been written out.
2176 */
Dave Chinner71e330b2010-05-21 14:37:18 +10002177int
Christoph Hellwig35a8a722010-02-15 23:34:54 +00002178xlog_write(
Mark Tinguelyad223e62012-06-14 09:22:15 -05002179 struct xlog *log,
Dave Chinner55b66332010-03-23 11:43:17 +11002180 struct xfs_log_vec *log_vector,
Christoph Hellwig35a8a722010-02-15 23:34:54 +00002181 struct xlog_ticket *ticket,
2182 xfs_lsn_t *start_lsn,
2183 struct xlog_in_core **commit_iclog,
2184 uint flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002185{
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002186 struct xlog_in_core *iclog = NULL;
Dave Chinner55b66332010-03-23 11:43:17 +11002187 struct xfs_log_iovec *vecp;
2188 struct xfs_log_vec *lv;
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002189 int len;
2190 int index;
2191 int partial_copy = 0;
2192 int partial_copy_len = 0;
2193 int contwr = 0;
2194 int record_cnt = 0;
2195 int data_cnt = 0;
2196 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002197
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002198 *start_lsn = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002199
Dave Chinner55b66332010-03-23 11:43:17 +11002200 len = xlog_write_calc_vec_length(ticket, log_vector);
Dave Chinner71e330b2010-05-21 14:37:18 +10002201
Christoph Hellwig93b8a582011-12-06 21:58:07 +00002202 /*
2203 * Region headers and bytes are already accounted for.
2204 * We only need to take into account start records and
2205 * split regions in this function.
2206 */
2207 if (ticket->t_flags & XLOG_TIC_INITED)
2208 ticket->t_curr_res -= sizeof(xlog_op_header_t);
2209
2210 /*
2211 * Commit record headers need to be accounted for. These
2212 * come in as separate writes so are easy to detect.
2213 */
2214 if (flags & (XLOG_COMMIT_TRANS | XLOG_UNMOUNT_TRANS))
2215 ticket->t_curr_res -= sizeof(xlog_op_header_t);
Dave Chinner71e330b2010-05-21 14:37:18 +10002216
2217 if (ticket->t_curr_res < 0)
Dave Chinner55b66332010-03-23 11:43:17 +11002218 xlog_print_tic_res(log->l_mp, ticket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002219
Dave Chinner55b66332010-03-23 11:43:17 +11002220 index = 0;
2221 lv = log_vector;
2222 vecp = lv->lv_iovecp;
Dave Chinnerfd638752013-06-27 16:04:51 +10002223 while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) {
Christoph Hellwige6b1f272010-03-23 11:47:38 +11002224 void *ptr;
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002225 int log_offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002226
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002227 error = xlog_state_get_iclog_space(log, len, &iclog, ticket,
2228 &contwr, &log_offset);
2229 if (error)
2230 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002231
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002232 ASSERT(log_offset <= iclog->ic_size - 1);
Christoph Hellwige6b1f272010-03-23 11:47:38 +11002233 ptr = iclog->ic_datap + log_offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002235 /* start_lsn is the first lsn written to. That's all we need. */
2236 if (!*start_lsn)
2237 *start_lsn = be64_to_cpu(iclog->ic_header.h_lsn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002238
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002239 /*
2240 * This loop writes out as many regions as can fit in the amount
2241 * of space which was allocated by xlog_state_get_iclog_space().
2242 */
Dave Chinnerfd638752013-06-27 16:04:51 +10002243 while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) {
2244 struct xfs_log_iovec *reg;
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002245 struct xlog_op_header *ophdr;
2246 int start_rec_copy;
2247 int copy_len;
2248 int copy_off;
Dave Chinnerfd638752013-06-27 16:04:51 +10002249 bool ordered = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002250
Dave Chinnerfd638752013-06-27 16:04:51 +10002251 /* ordered log vectors have no regions to write */
2252 if (lv->lv_buf_len == XFS_LOG_VEC_ORDERED) {
2253 ASSERT(lv->lv_niovecs == 0);
2254 ordered = true;
2255 goto next_lv;
2256 }
2257
2258 reg = &vecp[index];
Dave Chinner55b66332010-03-23 11:43:17 +11002259 ASSERT(reg->i_len % sizeof(__int32_t) == 0);
Christoph Hellwige6b1f272010-03-23 11:47:38 +11002260 ASSERT((unsigned long)ptr % sizeof(__int32_t) == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002261
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002262 start_rec_copy = xlog_write_start_rec(ptr, ticket);
2263 if (start_rec_copy) {
2264 record_cnt++;
Christoph Hellwige6b1f272010-03-23 11:47:38 +11002265 xlog_write_adv_cnt(&ptr, &len, &log_offset,
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002266 start_rec_copy);
2267 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002268
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002269 ophdr = xlog_write_setup_ophdr(log, ptr, ticket, flags);
2270 if (!ophdr)
2271 return XFS_ERROR(EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002272
Christoph Hellwige6b1f272010-03-23 11:47:38 +11002273 xlog_write_adv_cnt(&ptr, &len, &log_offset,
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002274 sizeof(struct xlog_op_header));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002275
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002276 len += xlog_write_setup_copy(ticket, ophdr,
2277 iclog->ic_size-log_offset,
Dave Chinner55b66332010-03-23 11:43:17 +11002278 reg->i_len,
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002279 &copy_off, &copy_len,
2280 &partial_copy,
2281 &partial_copy_len);
2282 xlog_verify_dest_ptr(log, ptr);
Dave Chinnerb5203cd2010-03-23 11:29:44 +11002283
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002284 /* copy region */
2285 ASSERT(copy_len >= 0);
Christoph Hellwige6b1f272010-03-23 11:47:38 +11002286 memcpy(ptr, reg->i_addr + copy_off, copy_len);
2287 xlog_write_adv_cnt(&ptr, &len, &log_offset, copy_len);
Dave Chinnerb5203cd2010-03-23 11:29:44 +11002288
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002289 copy_len += start_rec_copy + sizeof(xlog_op_header_t);
2290 record_cnt++;
2291 data_cnt += contwr ? copy_len : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002292
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002293 error = xlog_write_copy_finish(log, iclog, flags,
2294 &record_cnt, &data_cnt,
2295 &partial_copy,
2296 &partial_copy_len,
2297 log_offset,
2298 commit_iclog);
2299 if (error)
2300 return error;
2301
2302 /*
2303 * if we had a partial copy, we need to get more iclog
2304 * space but we don't want to increment the region
2305 * index because there is still more is this region to
2306 * write.
2307 *
2308 * If we completed writing this region, and we flushed
2309 * the iclog (indicated by resetting of the record
2310 * count), then we also need to get more log space. If
2311 * this was the last record, though, we are done and
2312 * can just return.
2313 */
2314 if (partial_copy)
2315 break;
2316
Dave Chinner55b66332010-03-23 11:43:17 +11002317 if (++index == lv->lv_niovecs) {
Dave Chinnerfd638752013-06-27 16:04:51 +10002318next_lv:
Dave Chinner55b66332010-03-23 11:43:17 +11002319 lv = lv->lv_next;
2320 index = 0;
2321 if (lv)
2322 vecp = lv->lv_iovecp;
2323 }
Dave Chinnerfd638752013-06-27 16:04:51 +10002324 if (record_cnt == 0 && ordered == false) {
Dave Chinner55b66332010-03-23 11:43:17 +11002325 if (!lv)
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002326 return 0;
2327 break;
2328 }
2329 }
2330 }
2331
2332 ASSERT(len == 0);
2333
2334 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt);
2335 if (!commit_iclog)
2336 return xlog_state_release_iclog(log, iclog);
2337
Linus Torvalds1da177e2005-04-16 15:20:36 -07002338 ASSERT(flags & XLOG_COMMIT_TRANS);
2339 *commit_iclog = iclog;
2340 return 0;
Christoph Hellwig99428ad2010-03-23 11:35:45 +11002341}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002342
2343
2344/*****************************************************************************
2345 *
2346 * State Machine functions
2347 *
2348 *****************************************************************************
2349 */
2350
2351/* Clean iclogs starting from the head. This ordering must be
2352 * maintained, so an iclog doesn't become ACTIVE beyond one that
2353 * is SYNCING. This is also required to maintain the notion that we use
David Chinner12017fa2008-08-13 16:34:31 +10002354 * a ordered wait queue to hold off would be writers to the log when every
Linus Torvalds1da177e2005-04-16 15:20:36 -07002355 * iclog is trying to sync to disk.
2356 *
2357 * State Change: DIRTY -> ACTIVE
2358 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10002359STATIC void
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05002360xlog_state_clean_log(
2361 struct xlog *log)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002362{
2363 xlog_in_core_t *iclog;
2364 int changed = 0;
2365
2366 iclog = log->l_iclog;
2367 do {
2368 if (iclog->ic_state == XLOG_STATE_DIRTY) {
2369 iclog->ic_state = XLOG_STATE_ACTIVE;
2370 iclog->ic_offset = 0;
David Chinner114d23a2008-04-10 12:18:39 +10002371 ASSERT(iclog->ic_callback == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002372 /*
2373 * If the number of ops in this iclog indicate it just
2374 * contains the dummy transaction, we can
2375 * change state into IDLE (the second time around).
2376 * Otherwise we should change the state into
2377 * NEED a dummy.
2378 * We don't need to cover the dummy.
2379 */
2380 if (!changed &&
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002381 (be32_to_cpu(iclog->ic_header.h_num_logops) ==
2382 XLOG_COVER_OPS)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002383 changed = 1;
2384 } else {
2385 /*
2386 * We have two dirty iclogs so start over
2387 * This could also be num of ops indicates
2388 * this is not the dummy going out.
2389 */
2390 changed = 2;
2391 }
2392 iclog->ic_header.h_num_logops = 0;
2393 memset(iclog->ic_header.h_cycle_data, 0,
2394 sizeof(iclog->ic_header.h_cycle_data));
2395 iclog->ic_header.h_lsn = 0;
2396 } else if (iclog->ic_state == XLOG_STATE_ACTIVE)
2397 /* do nothing */;
2398 else
2399 break; /* stop cleaning */
2400 iclog = iclog->ic_next;
2401 } while (iclog != log->l_iclog);
2402
2403 /* log is locked when we are called */
2404 /*
2405 * Change state for the dummy log recording.
2406 * We usually go to NEED. But we go to NEED2 if the changed indicates
2407 * we are done writing the dummy record.
2408 * If we are done with the second dummy recored (DONE2), then
2409 * we go to IDLE.
2410 */
2411 if (changed) {
2412 switch (log->l_covered_state) {
2413 case XLOG_STATE_COVER_IDLE:
2414 case XLOG_STATE_COVER_NEED:
2415 case XLOG_STATE_COVER_NEED2:
2416 log->l_covered_state = XLOG_STATE_COVER_NEED;
2417 break;
2418
2419 case XLOG_STATE_COVER_DONE:
2420 if (changed == 1)
2421 log->l_covered_state = XLOG_STATE_COVER_NEED2;
2422 else
2423 log->l_covered_state = XLOG_STATE_COVER_NEED;
2424 break;
2425
2426 case XLOG_STATE_COVER_DONE2:
2427 if (changed == 1)
2428 log->l_covered_state = XLOG_STATE_COVER_IDLE;
2429 else
2430 log->l_covered_state = XLOG_STATE_COVER_NEED;
2431 break;
2432
2433 default:
2434 ASSERT(0);
2435 }
2436 }
2437} /* xlog_state_clean_log */
2438
2439STATIC xfs_lsn_t
2440xlog_get_lowest_lsn(
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05002441 struct xlog *log)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002442{
2443 xlog_in_core_t *lsn_log;
2444 xfs_lsn_t lowest_lsn, lsn;
2445
2446 lsn_log = log->l_iclog;
2447 lowest_lsn = 0;
2448 do {
2449 if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) {
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002450 lsn = be64_to_cpu(lsn_log->ic_header.h_lsn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002451 if ((lsn && !lowest_lsn) ||
2452 (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) {
2453 lowest_lsn = lsn;
2454 }
2455 }
2456 lsn_log = lsn_log->ic_next;
2457 } while (lsn_log != log->l_iclog);
Jesper Juhl014c2542006-01-15 02:37:08 +01002458 return lowest_lsn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002459}
2460
2461
2462STATIC void
2463xlog_state_do_callback(
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05002464 struct xlog *log,
2465 int aborted,
2466 struct xlog_in_core *ciclog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002467{
2468 xlog_in_core_t *iclog;
2469 xlog_in_core_t *first_iclog; /* used to know when we've
2470 * processed all iclogs once */
2471 xfs_log_callback_t *cb, *cb_next;
2472 int flushcnt = 0;
2473 xfs_lsn_t lowest_lsn;
2474 int ioerrors; /* counter: iclogs with errors */
2475 int loopdidcallbacks; /* flag: inner loop did callbacks*/
2476 int funcdidcallbacks; /* flag: function did callbacks */
2477 int repeats; /* for issuing console warnings if
2478 * looping too many times */
Matthew Wilcoxd748c622008-05-19 16:34:27 +10002479 int wake = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002480
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002481 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002482 first_iclog = iclog = log->l_iclog;
2483 ioerrors = 0;
2484 funcdidcallbacks = 0;
2485 repeats = 0;
2486
2487 do {
2488 /*
2489 * Scan all iclogs starting with the one pointed to by the
2490 * log. Reset this starting point each time the log is
2491 * unlocked (during callbacks).
2492 *
2493 * Keep looping through iclogs until one full pass is made
2494 * without running any callbacks.
2495 */
2496 first_iclog = log->l_iclog;
2497 iclog = log->l_iclog;
2498 loopdidcallbacks = 0;
2499 repeats++;
2500
2501 do {
2502
2503 /* skip all iclogs in the ACTIVE & DIRTY states */
2504 if (iclog->ic_state &
2505 (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) {
2506 iclog = iclog->ic_next;
2507 continue;
2508 }
2509
2510 /*
2511 * Between marking a filesystem SHUTDOWN and stopping
2512 * the log, we do flush all iclogs to disk (if there
2513 * wasn't a log I/O error). So, we do want things to
2514 * go smoothly in case of just a SHUTDOWN w/o a
2515 * LOG_IO_ERROR.
2516 */
2517 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) {
2518 /*
2519 * Can only perform callbacks in order. Since
2520 * this iclog is not in the DONE_SYNC/
2521 * DO_CALLBACK state, we skip the rest and
2522 * just try to clean up. If we set our iclog
2523 * to DO_CALLBACK, we will not process it when
2524 * we retry since a previous iclog is in the
2525 * CALLBACK and the state cannot change since
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002526 * we are holding the l_icloglock.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002527 */
2528 if (!(iclog->ic_state &
2529 (XLOG_STATE_DONE_SYNC |
2530 XLOG_STATE_DO_CALLBACK))) {
2531 if (ciclog && (ciclog->ic_state ==
2532 XLOG_STATE_DONE_SYNC)) {
2533 ciclog->ic_state = XLOG_STATE_DO_CALLBACK;
2534 }
2535 break;
2536 }
2537 /*
2538 * We now have an iclog that is in either the
2539 * DO_CALLBACK or DONE_SYNC states. The other
2540 * states (WANT_SYNC, SYNCING, or CALLBACK were
2541 * caught by the above if and are going to
2542 * clean (i.e. we aren't doing their callbacks)
2543 * see the above if.
2544 */
2545
2546 /*
2547 * We will do one more check here to see if we
2548 * have chased our tail around.
2549 */
2550
2551 lowest_lsn = xlog_get_lowest_lsn(log);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002552 if (lowest_lsn &&
2553 XFS_LSN_CMP(lowest_lsn,
Dave Chinner84f3c682010-12-03 22:11:29 +11002554 be64_to_cpu(iclog->ic_header.h_lsn)) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002555 iclog = iclog->ic_next;
2556 continue; /* Leave this iclog for
2557 * another thread */
2558 }
2559
2560 iclog->ic_state = XLOG_STATE_CALLBACK;
2561
Linus Torvalds1da177e2005-04-16 15:20:36 -07002562
Dave Chinner84f3c682010-12-03 22:11:29 +11002563 /*
Dave Chinnerd35e88f2012-10-08 21:56:12 +11002564 * Completion of a iclog IO does not imply that
2565 * a transaction has completed, as transactions
2566 * can be large enough to span many iclogs. We
2567 * cannot change the tail of the log half way
2568 * through a transaction as this may be the only
2569 * transaction in the log and moving th etail to
2570 * point to the middle of it will prevent
2571 * recovery from finding the start of the
2572 * transaction. Hence we should only update the
2573 * last_sync_lsn if this iclog contains
2574 * transaction completion callbacks on it.
2575 *
2576 * We have to do this before we drop the
Dave Chinner84f3c682010-12-03 22:11:29 +11002577 * icloglock to ensure we are the only one that
2578 * can update it.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002579 */
Dave Chinner84f3c682010-12-03 22:11:29 +11002580 ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn),
2581 be64_to_cpu(iclog->ic_header.h_lsn)) <= 0);
Dave Chinnerd35e88f2012-10-08 21:56:12 +11002582 if (iclog->ic_callback)
2583 atomic64_set(&log->l_last_sync_lsn,
2584 be64_to_cpu(iclog->ic_header.h_lsn));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002585
Dave Chinner84f3c682010-12-03 22:11:29 +11002586 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002587 ioerrors++;
Dave Chinner84f3c682010-12-03 22:11:29 +11002588
2589 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002590
David Chinner114d23a2008-04-10 12:18:39 +10002591 /*
2592 * Keep processing entries in the callback list until
2593 * we come around and it is empty. We need to
2594 * atomically see that the list is empty and change the
2595 * state to DIRTY so that we don't miss any more
2596 * callbacks being added.
2597 */
2598 spin_lock(&iclog->ic_callback_lock);
2599 cb = iclog->ic_callback;
Christoph Hellwig4b809162007-08-16 15:37:36 +10002600 while (cb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002601 iclog->ic_callback_tail = &(iclog->ic_callback);
2602 iclog->ic_callback = NULL;
David Chinner114d23a2008-04-10 12:18:39 +10002603 spin_unlock(&iclog->ic_callback_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002604
2605 /* perform callbacks in the order given */
Christoph Hellwig4b809162007-08-16 15:37:36 +10002606 for (; cb; cb = cb_next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002607 cb_next = cb->cb_next;
2608 cb->cb_func(cb->cb_arg, aborted);
2609 }
David Chinner114d23a2008-04-10 12:18:39 +10002610 spin_lock(&iclog->ic_callback_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002611 cb = iclog->ic_callback;
2612 }
2613
2614 loopdidcallbacks++;
2615 funcdidcallbacks++;
2616
David Chinner114d23a2008-04-10 12:18:39 +10002617 spin_lock(&log->l_icloglock);
Christoph Hellwig4b809162007-08-16 15:37:36 +10002618 ASSERT(iclog->ic_callback == NULL);
David Chinner114d23a2008-04-10 12:18:39 +10002619 spin_unlock(&iclog->ic_callback_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002620 if (!(iclog->ic_state & XLOG_STATE_IOERROR))
2621 iclog->ic_state = XLOG_STATE_DIRTY;
2622
2623 /*
2624 * Transition from DIRTY to ACTIVE if applicable.
2625 * NOP if STATE_IOERROR.
2626 */
2627 xlog_state_clean_log(log);
2628
2629 /* wake up threads waiting in xfs_log_force() */
Dave Chinnereb40a872010-12-21 12:09:01 +11002630 wake_up_all(&iclog->ic_force_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002631
2632 iclog = iclog->ic_next;
2633 } while (first_iclog != iclog);
Nathan Scotta3c6685e2006-09-28 11:02:14 +10002634
2635 if (repeats > 5000) {
2636 flushcnt += repeats;
2637 repeats = 0;
Dave Chinnera0fa2b62011-03-07 10:01:35 +11002638 xfs_warn(log->l_mp,
Nathan Scotta3c6685e2006-09-28 11:02:14 +10002639 "%s: possible infinite loop (%d iterations)",
Harvey Harrison34a622b2008-04-10 12:19:21 +10002640 __func__, flushcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002641 }
2642 } while (!ioerrors && loopdidcallbacks);
2643
2644 /*
2645 * make one last gasp attempt to see if iclogs are being left in
2646 * limbo..
2647 */
2648#ifdef DEBUG
2649 if (funcdidcallbacks) {
2650 first_iclog = iclog = log->l_iclog;
2651 do {
2652 ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK);
2653 /*
2654 * Terminate the loop if iclogs are found in states
2655 * which will cause other threads to clean up iclogs.
2656 *
2657 * SYNCING - i/o completion will go through logs
2658 * DONE_SYNC - interrupt thread should be waiting for
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002659 * l_icloglock
Linus Torvalds1da177e2005-04-16 15:20:36 -07002660 * IOERROR - give up hope all ye who enter here
2661 */
2662 if (iclog->ic_state == XLOG_STATE_WANT_SYNC ||
2663 iclog->ic_state == XLOG_STATE_SYNCING ||
2664 iclog->ic_state == XLOG_STATE_DONE_SYNC ||
2665 iclog->ic_state == XLOG_STATE_IOERROR )
2666 break;
2667 iclog = iclog->ic_next;
2668 } while (first_iclog != iclog);
2669 }
2670#endif
2671
Matthew Wilcoxd748c622008-05-19 16:34:27 +10002672 if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR))
2673 wake = 1;
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002674 spin_unlock(&log->l_icloglock);
Matthew Wilcoxd748c622008-05-19 16:34:27 +10002675
2676 if (wake)
Dave Chinnereb40a872010-12-21 12:09:01 +11002677 wake_up_all(&log->l_flush_wait);
Matthew Wilcoxd748c622008-05-19 16:34:27 +10002678}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002679
2680
2681/*
2682 * Finish transitioning this iclog to the dirty state.
2683 *
2684 * Make sure that we completely execute this routine only when this is
2685 * the last call to the iclog. There is a good chance that iclog flushes,
2686 * when we reach the end of the physical log, get turned into 2 separate
2687 * calls to bwrite. Hence, one iclog flush could generate two calls to this
2688 * routine. By using the reference count bwritecnt, we guarantee that only
2689 * the second completion goes through.
2690 *
2691 * Callbacks could take time, so they are done outside the scope of the
David Chinner12017fa2008-08-13 16:34:31 +10002692 * global state machine log lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002693 */
David Chinnera8272ce2007-11-23 16:28:09 +11002694STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -07002695xlog_state_done_syncing(
2696 xlog_in_core_t *iclog,
2697 int aborted)
2698{
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05002699 struct xlog *log = iclog->ic_log;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002700
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002701 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002702
2703 ASSERT(iclog->ic_state == XLOG_STATE_SYNCING ||
2704 iclog->ic_state == XLOG_STATE_IOERROR);
David Chinner155cc6b2008-03-06 13:44:14 +11002705 ASSERT(atomic_read(&iclog->ic_refcnt) == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002706 ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2);
2707
2708
2709 /*
2710 * If we got an error, either on the first buffer, or in the case of
2711 * split log writes, on the second, we mark ALL iclogs STATE_IOERROR,
2712 * and none should ever be attempted to be written to disk
2713 * again.
2714 */
2715 if (iclog->ic_state != XLOG_STATE_IOERROR) {
2716 if (--iclog->ic_bwritecnt == 1) {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002717 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002718 return;
2719 }
2720 iclog->ic_state = XLOG_STATE_DONE_SYNC;
2721 }
2722
2723 /*
2724 * Someone could be sleeping prior to writing out the next
2725 * iclog buffer, we wake them all, one will get to do the
2726 * I/O, the others get to wait for the result.
2727 */
Dave Chinnereb40a872010-12-21 12:09:01 +11002728 wake_up_all(&iclog->ic_write_wait);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002729 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002730 xlog_state_do_callback(log, aborted, iclog); /* also cleans log */
2731} /* xlog_state_done_syncing */
2732
2733
2734/*
2735 * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must
David Chinner12017fa2008-08-13 16:34:31 +10002736 * sleep. We wait on the flush queue on the head iclog as that should be
2737 * the first iclog to complete flushing. Hence if all iclogs are syncing,
2738 * we will wait here and all new writes will sleep until a sync completes.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002739 *
2740 * The in-core logs are used in a circular fashion. They are not used
2741 * out-of-order even when an iclog past the head is free.
2742 *
2743 * return:
2744 * * log_offset where xlog_write() can start writing into the in-core
2745 * log's data space.
2746 * * in-core log pointer to which xlog_write() should write.
2747 * * boolean indicating this is a continued write to an in-core log.
2748 * If this is the last write, then the in-core log's offset field
2749 * needs to be incremented, depending on the amount of data which
2750 * is copied.
2751 */
David Chinnera8272ce2007-11-23 16:28:09 +11002752STATIC int
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05002753xlog_state_get_iclog_space(
2754 struct xlog *log,
2755 int len,
2756 struct xlog_in_core **iclogp,
2757 struct xlog_ticket *ticket,
2758 int *continued_write,
2759 int *logoffsetp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002760{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002761 int log_offset;
2762 xlog_rec_header_t *head;
2763 xlog_in_core_t *iclog;
2764 int error;
2765
2766restart:
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002767 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002768 if (XLOG_FORCED_SHUTDOWN(log)) {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002769 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002770 return XFS_ERROR(EIO);
2771 }
2772
2773 iclog = log->l_iclog;
Matthew Wilcoxd748c622008-05-19 16:34:27 +10002774 if (iclog->ic_state != XLOG_STATE_ACTIVE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002775 XFS_STATS_INC(xs_log_noiclogs);
Matthew Wilcoxd748c622008-05-19 16:34:27 +10002776
2777 /* Wait for log writes to have flushed */
Dave Chinnereb40a872010-12-21 12:09:01 +11002778 xlog_wait(&log->l_flush_wait, &log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002779 goto restart;
2780 }
Matthew Wilcoxd748c622008-05-19 16:34:27 +10002781
Linus Torvalds1da177e2005-04-16 15:20:36 -07002782 head = &iclog->ic_header;
2783
David Chinner155cc6b2008-03-06 13:44:14 +11002784 atomic_inc(&iclog->ic_refcnt); /* prevents sync */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002785 log_offset = iclog->ic_offset;
2786
2787 /* On the 1st write to an iclog, figure out lsn. This works
2788 * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are
2789 * committing to. If the offset is set, that's how many blocks
2790 * must be written.
2791 */
2792 if (log_offset == 0) {
2793 ticket->t_curr_res -= log->l_iclog_hsize;
Christoph Hellwig0adba532007-08-30 17:21:46 +10002794 xlog_tic_add_region(ticket,
Tim Shimmin7e9c6392005-09-02 16:42:05 +10002795 log->l_iclog_hsize,
2796 XLOG_REG_TYPE_LRHEADER);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002797 head->h_cycle = cpu_to_be32(log->l_curr_cycle);
2798 head->h_lsn = cpu_to_be64(
Christoph Hellwig03bea6f2007-10-12 10:58:05 +10002799 xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002800 ASSERT(log->l_curr_block >= 0);
2801 }
2802
2803 /* If there is enough room to write everything, then do it. Otherwise,
2804 * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC
2805 * bit is on, so this will get flushed out. Don't update ic_offset
2806 * until you know exactly how many bytes get copied. Therefore, wait
2807 * until later to update ic_offset.
2808 *
2809 * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's
2810 * can fit into remaining data section.
2811 */
2812 if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) {
2813 xlog_state_switch_iclogs(log, iclog, iclog->ic_size);
2814
Dave Chinner49641f12008-07-11 17:43:55 +10002815 /*
2816 * If I'm the only one writing to this iclog, sync it to disk.
2817 * We need to do an atomic compare and decrement here to avoid
2818 * racing with concurrent atomic_dec_and_lock() calls in
2819 * xlog_state_release_iclog() when there is more than one
2820 * reference to the iclog.
2821 */
2822 if (!atomic_add_unless(&iclog->ic_refcnt, -1, 1)) {
2823 /* we are the only one */
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002824 spin_unlock(&log->l_icloglock);
Dave Chinner49641f12008-07-11 17:43:55 +10002825 error = xlog_state_release_iclog(log, iclog);
2826 if (error)
Jesper Juhl014c2542006-01-15 02:37:08 +01002827 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002828 } else {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002829 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002830 }
2831 goto restart;
2832 }
2833
2834 /* Do we have enough room to write the full amount in the remainder
2835 * of this iclog? Or must we continue a write on the next iclog and
2836 * mark this iclog as completely taken? In the case where we switch
2837 * iclogs (to mark it taken), this particular iclog will release/sync
2838 * to disk in xlog_write().
2839 */
2840 if (len <= iclog->ic_size - iclog->ic_offset) {
2841 *continued_write = 0;
2842 iclog->ic_offset += len;
2843 } else {
2844 *continued_write = 1;
2845 xlog_state_switch_iclogs(log, iclog, iclog->ic_size);
2846 }
2847 *iclogp = iclog;
2848
2849 ASSERT(iclog->ic_offset <= iclog->ic_size);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002850 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002851
2852 *logoffsetp = log_offset;
2853 return 0;
2854} /* xlog_state_get_iclog_space */
2855
Linus Torvalds1da177e2005-04-16 15:20:36 -07002856/* The first cnt-1 times through here we don't need to
2857 * move the grant write head because the permanent
2858 * reservation has reserved cnt times the unit amount.
2859 * Release part of current permanent unit reservation and
2860 * reset current reservation to be one units worth. Also
2861 * move grant reservation head forward.
2862 */
2863STATIC void
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05002864xlog_regrant_reserve_log_space(
2865 struct xlog *log,
2866 struct xlog_ticket *ticket)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002867{
Christoph Hellwig0b1b2132009-12-14 23:14:59 +00002868 trace_xfs_log_regrant_reserve_enter(log, ticket);
2869
Linus Torvalds1da177e2005-04-16 15:20:36 -07002870 if (ticket->t_cnt > 0)
2871 ticket->t_cnt--;
2872
Christoph Hellwig28496962012-02-20 02:31:25 +00002873 xlog_grant_sub_space(log, &log->l_reserve_head.grant,
Dave Chinnera69ed032010-12-21 12:08:20 +11002874 ticket->t_curr_res);
Christoph Hellwig28496962012-02-20 02:31:25 +00002875 xlog_grant_sub_space(log, &log->l_write_head.grant,
Dave Chinnera69ed032010-12-21 12:08:20 +11002876 ticket->t_curr_res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002877 ticket->t_curr_res = ticket->t_unit_res;
Christoph Hellwig0adba532007-08-30 17:21:46 +10002878 xlog_tic_reset_res(ticket);
Christoph Hellwig0b1b2132009-12-14 23:14:59 +00002879
2880 trace_xfs_log_regrant_reserve_sub(log, ticket);
2881
Linus Torvalds1da177e2005-04-16 15:20:36 -07002882 /* just return if we still have some of the pre-reserved space */
Dave Chinnerd0eb2f32010-12-21 12:29:14 +11002883 if (ticket->t_cnt > 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002884 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002885
Christoph Hellwig28496962012-02-20 02:31:25 +00002886 xlog_grant_add_space(log, &log->l_reserve_head.grant,
Dave Chinnera69ed032010-12-21 12:08:20 +11002887 ticket->t_unit_res);
Christoph Hellwig0b1b2132009-12-14 23:14:59 +00002888
2889 trace_xfs_log_regrant_reserve_exit(log, ticket);
2890
Linus Torvalds1da177e2005-04-16 15:20:36 -07002891 ticket->t_curr_res = ticket->t_unit_res;
Christoph Hellwig0adba532007-08-30 17:21:46 +10002892 xlog_tic_reset_res(ticket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002893} /* xlog_regrant_reserve_log_space */
2894
2895
2896/*
2897 * Give back the space left from a reservation.
2898 *
2899 * All the information we need to make a correct determination of space left
2900 * is present. For non-permanent reservations, things are quite easy. The
2901 * count should have been decremented to zero. We only need to deal with the
2902 * space remaining in the current reservation part of the ticket. If the
2903 * ticket contains a permanent reservation, there may be left over space which
2904 * needs to be released. A count of N means that N-1 refills of the current
2905 * reservation can be done before we need to ask for more space. The first
2906 * one goes to fill up the first current reservation. Once we run out of
2907 * space, the count will stay at zero and the only space remaining will be
2908 * in the current reservation field.
2909 */
2910STATIC void
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05002911xlog_ungrant_log_space(
2912 struct xlog *log,
2913 struct xlog_ticket *ticket)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002914{
Dave Chinner663e4962010-12-21 12:06:05 +11002915 int bytes;
2916
Linus Torvalds1da177e2005-04-16 15:20:36 -07002917 if (ticket->t_cnt > 0)
2918 ticket->t_cnt--;
2919
Christoph Hellwig0b1b2132009-12-14 23:14:59 +00002920 trace_xfs_log_ungrant_enter(log, ticket);
Christoph Hellwig0b1b2132009-12-14 23:14:59 +00002921 trace_xfs_log_ungrant_sub(log, ticket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002922
Dave Chinner663e4962010-12-21 12:06:05 +11002923 /*
2924 * If this is a permanent reservation ticket, we may be able to free
Linus Torvalds1da177e2005-04-16 15:20:36 -07002925 * up more space based on the remaining count.
2926 */
Dave Chinner663e4962010-12-21 12:06:05 +11002927 bytes = ticket->t_curr_res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002928 if (ticket->t_cnt > 0) {
2929 ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV);
Dave Chinner663e4962010-12-21 12:06:05 +11002930 bytes += ticket->t_unit_res*ticket->t_cnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002931 }
2932
Christoph Hellwig28496962012-02-20 02:31:25 +00002933 xlog_grant_sub_space(log, &log->l_reserve_head.grant, bytes);
2934 xlog_grant_sub_space(log, &log->l_write_head.grant, bytes);
Dave Chinner663e4962010-12-21 12:06:05 +11002935
Christoph Hellwig0b1b2132009-12-14 23:14:59 +00002936 trace_xfs_log_ungrant_exit(log, ticket);
2937
Christoph Hellwigcfb7cdc2012-02-20 02:31:23 +00002938 xfs_log_space_wake(log->l_mp);
Christoph Hellwig09a423a2012-02-20 02:31:20 +00002939}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002940
2941/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002942 * Flush iclog to disk if this is the last reference to the given iclog and
2943 * the WANT_SYNC bit is set.
2944 *
2945 * When this function is entered, the iclog is not necessarily in the
2946 * WANT_SYNC state. It may be sitting around waiting to get filled.
2947 *
2948 *
2949 */
David Chinnera8272ce2007-11-23 16:28:09 +11002950STATIC int
David Chinnerb5893342008-03-06 13:44:06 +11002951xlog_state_release_iclog(
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05002952 struct xlog *log,
2953 struct xlog_in_core *iclog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002954{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002955 int sync = 0; /* do we sync? */
2956
David Chinner155cc6b2008-03-06 13:44:14 +11002957 if (iclog->ic_state & XLOG_STATE_IOERROR)
2958 return XFS_ERROR(EIO);
2959
2960 ASSERT(atomic_read(&iclog->ic_refcnt) > 0);
2961 if (!atomic_dec_and_lock(&iclog->ic_refcnt, &log->l_icloglock))
2962 return 0;
2963
Linus Torvalds1da177e2005-04-16 15:20:36 -07002964 if (iclog->ic_state & XLOG_STATE_IOERROR) {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002965 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002966 return XFS_ERROR(EIO);
2967 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002968 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE ||
2969 iclog->ic_state == XLOG_STATE_WANT_SYNC);
2970
David Chinner155cc6b2008-03-06 13:44:14 +11002971 if (iclog->ic_state == XLOG_STATE_WANT_SYNC) {
David Chinnerb5893342008-03-06 13:44:06 +11002972 /* update tail before writing to iclog */
Dave Chinner1c3cb9e2010-12-21 12:28:39 +11002973 xfs_lsn_t tail_lsn = xlog_assign_tail_lsn(log->l_mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002974 sync++;
2975 iclog->ic_state = XLOG_STATE_SYNCING;
Dave Chinner1c3cb9e2010-12-21 12:28:39 +11002976 iclog->ic_header.h_tail_lsn = cpu_to_be64(tail_lsn);
2977 xlog_verify_tail_lsn(log, iclog, tail_lsn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002978 /* cycle incremented when incrementing curr_block */
2979 }
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002980 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002981
2982 /*
2983 * We let the log lock go, so it's possible that we hit a log I/O
Nathan Scottc41564b2006-03-29 08:55:14 +10002984 * error or some other SHUTDOWN condition that marks the iclog
Linus Torvalds1da177e2005-04-16 15:20:36 -07002985 * as XLOG_STATE_IOERROR before the bwrite. However, we know that
2986 * this iclog has consistent data, so we ignore IOERROR
2987 * flags after this point.
2988 */
David Chinnerb5893342008-03-06 13:44:06 +11002989 if (sync)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002990 return xlog_sync(log, iclog);
Jesper Juhl014c2542006-01-15 02:37:08 +01002991 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002992} /* xlog_state_release_iclog */
2993
2994
2995/*
2996 * This routine will mark the current iclog in the ring as WANT_SYNC
2997 * and move the current iclog pointer to the next iclog in the ring.
2998 * When this routine is called from xlog_state_get_iclog_space(), the
2999 * exact size of the iclog has not yet been determined. All we know is
3000 * that every data block. We have run out of space in this log record.
3001 */
3002STATIC void
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05003003xlog_state_switch_iclogs(
3004 struct xlog *log,
3005 struct xlog_in_core *iclog,
3006 int eventual_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003007{
3008 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE);
3009 if (!eventual_size)
3010 eventual_size = iclog->ic_offset;
3011 iclog->ic_state = XLOG_STATE_WANT_SYNC;
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003012 iclog->ic_header.h_prev_block = cpu_to_be32(log->l_prev_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003013 log->l_prev_block = log->l_curr_block;
3014 log->l_prev_cycle = log->l_curr_cycle;
3015
3016 /* roll log?: ic_offset changed later */
3017 log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize);
3018
3019 /* Round up to next log-sunit */
Eric Sandeen62118702008-03-06 13:44:28 +11003020 if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07003021 log->l_mp->m_sb.sb_logsunit > 1) {
3022 __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit);
3023 log->l_curr_block = roundup(log->l_curr_block, sunit_bb);
3024 }
3025
3026 if (log->l_curr_block >= log->l_logBBsize) {
3027 log->l_curr_cycle++;
3028 if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM)
3029 log->l_curr_cycle++;
3030 log->l_curr_block -= log->l_logBBsize;
3031 ASSERT(log->l_curr_block >= 0);
3032 }
3033 ASSERT(iclog == log->l_iclog);
3034 log->l_iclog = iclog->ic_next;
3035} /* xlog_state_switch_iclogs */
3036
Linus Torvalds1da177e2005-04-16 15:20:36 -07003037/*
3038 * Write out all data in the in-core log as of this exact moment in time.
3039 *
3040 * Data may be written to the in-core log during this call. However,
3041 * we don't guarantee this data will be written out. A change from past
3042 * implementation means this routine will *not* write out zero length LRs.
3043 *
3044 * Basically, we try and perform an intelligent scan of the in-core logs.
3045 * If we determine there is no flushable data, we just return. There is no
3046 * flushable data if:
3047 *
3048 * 1. the current iclog is active and has no data; the previous iclog
3049 * is in the active or dirty state.
3050 * 2. the current iclog is drity, and the previous iclog is in the
3051 * active or dirty state.
3052 *
David Chinner12017fa2008-08-13 16:34:31 +10003053 * We may sleep if:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003054 *
3055 * 1. the current iclog is not in the active nor dirty state.
3056 * 2. the current iclog dirty, and the previous iclog is not in the
3057 * active nor dirty state.
3058 * 3. the current iclog is active, and there is another thread writing
3059 * to this particular iclog.
3060 * 4. a) the current iclog is active and has no other writers
3061 * b) when we return from flushing out this iclog, it is still
3062 * not in the active nor dirty state.
3063 */
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003064int
3065_xfs_log_force(
3066 struct xfs_mount *mp,
3067 uint flags,
3068 int *log_flushed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003069{
Mark Tinguelyad223e62012-06-14 09:22:15 -05003070 struct xlog *log = mp->m_log;
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003071 struct xlog_in_core *iclog;
3072 xfs_lsn_t lsn;
3073
3074 XFS_STATS_INC(xs_log_force);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003075
Christoph Hellwig93b8a582011-12-06 21:58:07 +00003076 xlog_cil_force(log);
Dave Chinner71e330b2010-05-21 14:37:18 +10003077
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003078 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003079
3080 iclog = log->l_iclog;
3081 if (iclog->ic_state & XLOG_STATE_IOERROR) {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003082 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003083 return XFS_ERROR(EIO);
3084 }
3085
3086 /* If the head iclog is not active nor dirty, we just attach
3087 * ourselves to the head and go to sleep.
3088 */
3089 if (iclog->ic_state == XLOG_STATE_ACTIVE ||
3090 iclog->ic_state == XLOG_STATE_DIRTY) {
3091 /*
3092 * If the head is dirty or (active and empty), then
3093 * we need to look at the previous iclog. If the previous
3094 * iclog is active or dirty we are done. There is nothing
3095 * to sync out. Otherwise, we attach ourselves to the
3096 * previous iclog and go to sleep.
3097 */
3098 if (iclog->ic_state == XLOG_STATE_DIRTY ||
David Chinner155cc6b2008-03-06 13:44:14 +11003099 (atomic_read(&iclog->ic_refcnt) == 0
3100 && iclog->ic_offset == 0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003101 iclog = iclog->ic_prev;
3102 if (iclog->ic_state == XLOG_STATE_ACTIVE ||
3103 iclog->ic_state == XLOG_STATE_DIRTY)
3104 goto no_sleep;
3105 else
3106 goto maybe_sleep;
3107 } else {
David Chinner155cc6b2008-03-06 13:44:14 +11003108 if (atomic_read(&iclog->ic_refcnt) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003109 /* We are the only one with access to this
3110 * iclog. Flush it out now. There should
3111 * be a roundoff of zero to show that someone
3112 * has already taken care of the roundoff from
3113 * the previous sync.
3114 */
David Chinner155cc6b2008-03-06 13:44:14 +11003115 atomic_inc(&iclog->ic_refcnt);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003116 lsn = be64_to_cpu(iclog->ic_header.h_lsn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003117 xlog_state_switch_iclogs(log, iclog, 0);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003118 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003119
3120 if (xlog_state_release_iclog(log, iclog))
3121 return XFS_ERROR(EIO);
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003122
3123 if (log_flushed)
3124 *log_flushed = 1;
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003125 spin_lock(&log->l_icloglock);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003126 if (be64_to_cpu(iclog->ic_header.h_lsn) == lsn &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07003127 iclog->ic_state != XLOG_STATE_DIRTY)
3128 goto maybe_sleep;
3129 else
3130 goto no_sleep;
3131 } else {
3132 /* Someone else is writing to this iclog.
3133 * Use its call to flush out the data. However,
3134 * the other thread may not force out this LR,
3135 * so we mark it WANT_SYNC.
3136 */
3137 xlog_state_switch_iclogs(log, iclog, 0);
3138 goto maybe_sleep;
3139 }
3140 }
3141 }
3142
3143 /* By the time we come around again, the iclog could've been filled
3144 * which would give it another lsn. If we have a new lsn, just
3145 * return because the relevant data has been flushed.
3146 */
3147maybe_sleep:
3148 if (flags & XFS_LOG_SYNC) {
3149 /*
3150 * We must check if we're shutting down here, before
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003151 * we wait, while we're holding the l_icloglock.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003152 * Then we check again after waking up, in case our
3153 * sleep was disturbed by a bad news.
3154 */
3155 if (iclog->ic_state & XLOG_STATE_IOERROR) {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003156 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003157 return XFS_ERROR(EIO);
3158 }
3159 XFS_STATS_INC(xs_log_force_sleep);
Dave Chinnereb40a872010-12-21 12:09:01 +11003160 xlog_wait(&iclog->ic_force_wait, &log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003161 /*
3162 * No need to grab the log lock here since we're
3163 * only deciding whether or not to return EIO
3164 * and the memory read should be atomic.
3165 */
3166 if (iclog->ic_state & XLOG_STATE_IOERROR)
3167 return XFS_ERROR(EIO);
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003168 if (log_flushed)
3169 *log_flushed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003170 } else {
3171
3172no_sleep:
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003173 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003174 }
3175 return 0;
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003176}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003177
3178/*
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003179 * Wrapper for _xfs_log_force(), to be used when caller doesn't care
3180 * about errors or whether the log was flushed or not. This is the normal
3181 * interface to use when trying to unpin items or move the log forward.
3182 */
3183void
3184xfs_log_force(
3185 xfs_mount_t *mp,
3186 uint flags)
3187{
3188 int error;
3189
Dave Chinner14c26c62012-04-24 16:33:31 +10003190 trace_xfs_log_force(mp, 0);
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003191 error = _xfs_log_force(mp, flags, NULL);
Dave Chinnera0fa2b62011-03-07 10:01:35 +11003192 if (error)
3193 xfs_warn(mp, "%s: error %d returned.", __func__, error);
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003194}
3195
3196/*
3197 * Force the in-core log to disk for a specific LSN.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003198 *
3199 * Find in-core log with lsn.
3200 * If it is in the DIRTY state, just return.
3201 * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC
3202 * state and go to sleep or return.
3203 * If it is in any other state, go to sleep or return.
3204 *
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003205 * Synchronous forces are implemented with a signal variable. All callers
3206 * to force a given lsn to disk will wait on a the sv attached to the
3207 * specific in-core log. When given in-core log finally completes its
3208 * write to disk, that thread will wake up all threads waiting on the
3209 * sv.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003210 */
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003211int
3212_xfs_log_force_lsn(
3213 struct xfs_mount *mp,
3214 xfs_lsn_t lsn,
3215 uint flags,
3216 int *log_flushed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003217{
Mark Tinguelyad223e62012-06-14 09:22:15 -05003218 struct xlog *log = mp->m_log;
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003219 struct xlog_in_core *iclog;
3220 int already_slept = 0;
3221
3222 ASSERT(lsn != 0);
3223
3224 XFS_STATS_INC(xs_log_force);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003225
Christoph Hellwig93b8a582011-12-06 21:58:07 +00003226 lsn = xlog_cil_force_lsn(log, lsn);
3227 if (lsn == NULLCOMMITLSN)
3228 return 0;
Dave Chinner71e330b2010-05-21 14:37:18 +10003229
Linus Torvalds1da177e2005-04-16 15:20:36 -07003230try_again:
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003231 spin_lock(&log->l_icloglock);
3232 iclog = log->l_iclog;
3233 if (iclog->ic_state & XLOG_STATE_IOERROR) {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003234 spin_unlock(&log->l_icloglock);
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003235 return XFS_ERROR(EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003236 }
3237
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003238 do {
3239 if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) {
3240 iclog = iclog->ic_next;
3241 continue;
3242 }
3243
3244 if (iclog->ic_state == XLOG_STATE_DIRTY) {
3245 spin_unlock(&log->l_icloglock);
3246 return 0;
3247 }
3248
3249 if (iclog->ic_state == XLOG_STATE_ACTIVE) {
3250 /*
3251 * We sleep here if we haven't already slept (e.g.
3252 * this is the first time we've looked at the correct
3253 * iclog buf) and the buffer before us is going to
3254 * be sync'ed. The reason for this is that if we
3255 * are doing sync transactions here, by waiting for
3256 * the previous I/O to complete, we can allow a few
3257 * more transactions into this iclog before we close
3258 * it down.
3259 *
3260 * Otherwise, we mark the buffer WANT_SYNC, and bump
3261 * up the refcnt so we can release the log (which
3262 * drops the ref count). The state switch keeps new
3263 * transaction commits from using this buffer. When
3264 * the current commits finish writing into the buffer,
3265 * the refcount will drop to zero and the buffer will
3266 * go out then.
3267 */
3268 if (!already_slept &&
3269 (iclog->ic_prev->ic_state &
3270 (XLOG_STATE_WANT_SYNC | XLOG_STATE_SYNCING))) {
3271 ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR));
3272
3273 XFS_STATS_INC(xs_log_force_sleep);
3274
Dave Chinnereb40a872010-12-21 12:09:01 +11003275 xlog_wait(&iclog->ic_prev->ic_write_wait,
3276 &log->l_icloglock);
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003277 if (log_flushed)
3278 *log_flushed = 1;
3279 already_slept = 1;
3280 goto try_again;
3281 }
David Chinner155cc6b2008-03-06 13:44:14 +11003282 atomic_inc(&iclog->ic_refcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003283 xlog_state_switch_iclogs(log, iclog, 0);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003284 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003285 if (xlog_state_release_iclog(log, iclog))
3286 return XFS_ERROR(EIO);
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003287 if (log_flushed)
3288 *log_flushed = 1;
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003289 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003290 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003291
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003292 if ((flags & XFS_LOG_SYNC) && /* sleep */
3293 !(iclog->ic_state &
3294 (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) {
3295 /*
3296 * Don't wait on completion if we know that we've
3297 * gotten a log write error.
3298 */
3299 if (iclog->ic_state & XLOG_STATE_IOERROR) {
3300 spin_unlock(&log->l_icloglock);
3301 return XFS_ERROR(EIO);
3302 }
3303 XFS_STATS_INC(xs_log_force_sleep);
Dave Chinnereb40a872010-12-21 12:09:01 +11003304 xlog_wait(&iclog->ic_force_wait, &log->l_icloglock);
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003305 /*
3306 * No need to grab the log lock here since we're
3307 * only deciding whether or not to return EIO
3308 * and the memory read should be atomic.
3309 */
3310 if (iclog->ic_state & XLOG_STATE_IOERROR)
3311 return XFS_ERROR(EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003312
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003313 if (log_flushed)
3314 *log_flushed = 1;
3315 } else { /* just return */
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003316 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003317 }
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003318
3319 return 0;
3320 } while (iclog != log->l_iclog);
3321
3322 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003323 return 0;
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003324}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003325
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003326/*
3327 * Wrapper for _xfs_log_force_lsn(), to be used when caller doesn't care
3328 * about errors or whether the log was flushed or not. This is the normal
3329 * interface to use when trying to unpin items or move the log forward.
3330 */
3331void
3332xfs_log_force_lsn(
3333 xfs_mount_t *mp,
3334 xfs_lsn_t lsn,
3335 uint flags)
3336{
3337 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003338
Dave Chinner14c26c62012-04-24 16:33:31 +10003339 trace_xfs_log_force(mp, lsn);
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003340 error = _xfs_log_force_lsn(mp, lsn, flags, NULL);
Dave Chinnera0fa2b62011-03-07 10:01:35 +11003341 if (error)
3342 xfs_warn(mp, "%s: error %d returned.", __func__, error);
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003343}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003344
3345/*
3346 * Called when we want to mark the current iclog as being ready to sync to
3347 * disk.
3348 */
David Chinnera8272ce2007-11-23 16:28:09 +11003349STATIC void
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05003350xlog_state_want_sync(
3351 struct xlog *log,
3352 struct xlog_in_core *iclog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003353{
Christoph Hellwiga8914f32009-08-10 11:32:44 -03003354 assert_spin_locked(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003355
3356 if (iclog->ic_state == XLOG_STATE_ACTIVE) {
3357 xlog_state_switch_iclogs(log, iclog, 0);
3358 } else {
3359 ASSERT(iclog->ic_state &
3360 (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR));
3361 }
Christoph Hellwig39e2def2008-12-03 12:20:28 +01003362}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003363
3364
3365/*****************************************************************************
3366 *
3367 * TICKET functions
3368 *
3369 *****************************************************************************
3370 */
3371
3372/*
Malcolm Parsons9da096f2009-03-29 09:55:42 +02003373 * Free a used ticket when its refcount falls to zero.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003374 */
Dave Chinnercc09c0d2008-11-17 17:37:10 +11003375void
3376xfs_log_ticket_put(
3377 xlog_ticket_t *ticket)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003378{
Dave Chinnercc09c0d2008-11-17 17:37:10 +11003379 ASSERT(atomic_read(&ticket->t_ref) > 0);
Dave Chinnereb40a872010-12-21 12:09:01 +11003380 if (atomic_dec_and_test(&ticket->t_ref))
Dave Chinnercc09c0d2008-11-17 17:37:10 +11003381 kmem_zone_free(xfs_log_ticket_zone, ticket);
Dave Chinnercc09c0d2008-11-17 17:37:10 +11003382}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003383
Dave Chinnercc09c0d2008-11-17 17:37:10 +11003384xlog_ticket_t *
3385xfs_log_ticket_get(
3386 xlog_ticket_t *ticket)
3387{
3388 ASSERT(atomic_read(&ticket->t_ref) > 0);
3389 atomic_inc(&ticket->t_ref);
3390 return ticket;
3391}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003392
3393/*
David Chinnereb01c9c2008-04-10 12:18:46 +10003394 * Allocate and initialise a new log ticket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003395 */
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05003396struct xlog_ticket *
Dave Chinner9b9fc2b72010-03-23 11:21:11 +11003397xlog_ticket_alloc(
Mark Tinguelyad223e62012-06-14 09:22:15 -05003398 struct xlog *log,
Dave Chinner9b9fc2b72010-03-23 11:21:11 +11003399 int unit_bytes,
3400 int cnt,
3401 char client,
Christoph Hellwig9006fb92012-02-20 02:31:31 +00003402 bool permanent,
Al Viro77ba7872012-04-02 06:24:04 -04003403 xfs_km_flags_t alloc_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003404{
Dave Chinner9b9fc2b72010-03-23 11:21:11 +11003405 struct xlog_ticket *tic;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003406 uint num_headers;
Dave Chinner9b9fc2b72010-03-23 11:21:11 +11003407 int iclog_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003408
Dave Chinner3383ca52010-05-07 11:04:17 +10003409 tic = kmem_zone_zalloc(xfs_log_ticket_zone, alloc_flags);
David Chinnereb01c9c2008-04-10 12:18:46 +10003410 if (!tic)
3411 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003412
3413 /*
3414 * Permanent reservations have up to 'cnt'-1 active log operations
3415 * in the log. A unit in this case is the amount of space for one
3416 * of these log operations. Normal reservations have a cnt of 1
3417 * and their unit amount is the total amount of space required.
3418 *
3419 * The following lines of code account for non-transaction data
Tim Shimmin32fb9b52005-09-02 16:41:43 +10003420 * which occupy space in the on-disk log.
3421 *
3422 * Normal form of a transaction is:
3423 * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph>
3424 * and then there are LR hdrs, split-recs and roundoff at end of syncs.
3425 *
3426 * We need to account for all the leadup data and trailer data
3427 * around the transaction data.
3428 * And then we need to account for the worst case in terms of using
3429 * more space.
3430 * The worst case will happen if:
3431 * - the placement of the transaction happens to be such that the
3432 * roundoff is at its maximum
3433 * - the transaction data is synced before the commit record is synced
3434 * i.e. <transaction-data><roundoff> | <commit-rec><roundoff>
3435 * Therefore the commit record is in its own Log Record.
3436 * This can happen as the commit record is called with its
3437 * own region to xlog_write().
3438 * This then means that in the worst case, roundoff can happen for
3439 * the commit-rec as well.
3440 * The commit-rec is smaller than padding in this scenario and so it is
3441 * not added separately.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003442 */
3443
Tim Shimmin32fb9b52005-09-02 16:41:43 +10003444 /* for trans header */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003445 unit_bytes += sizeof(xlog_op_header_t);
Tim Shimmin32fb9b52005-09-02 16:41:43 +10003446 unit_bytes += sizeof(xfs_trans_header_t);
3447
3448 /* for start-rec */
3449 unit_bytes += sizeof(xlog_op_header_t);
3450
Dave Chinner9b9fc2b72010-03-23 11:21:11 +11003451 /*
3452 * for LR headers - the space for data in an iclog is the size minus
3453 * the space used for the headers. If we use the iclog size, then we
3454 * undercalculate the number of headers required.
3455 *
3456 * Furthermore - the addition of op headers for split-recs might
3457 * increase the space required enough to require more log and op
3458 * headers, so take that into account too.
3459 *
3460 * IMPORTANT: This reservation makes the assumption that if this
3461 * transaction is the first in an iclog and hence has the LR headers
3462 * accounted to it, then the remaining space in the iclog is
3463 * exclusively for this transaction. i.e. if the transaction is larger
3464 * than the iclog, it will be the only thing in that iclog.
3465 * Fundamentally, this means we must pass the entire log vector to
3466 * xlog_write to guarantee this.
3467 */
3468 iclog_space = log->l_iclog_size - log->l_iclog_hsize;
3469 num_headers = howmany(unit_bytes, iclog_space);
3470
3471 /* for split-recs - ophdrs added when data split over LRs */
3472 unit_bytes += sizeof(xlog_op_header_t) * num_headers;
3473
3474 /* add extra header reservations if we overrun */
3475 while (!num_headers ||
3476 howmany(unit_bytes, iclog_space) > num_headers) {
3477 unit_bytes += sizeof(xlog_op_header_t);
3478 num_headers++;
3479 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003480 unit_bytes += log->l_iclog_hsize * num_headers;
3481
Tim Shimmin32fb9b52005-09-02 16:41:43 +10003482 /* for commit-rec LR header - note: padding will subsume the ophdr */
3483 unit_bytes += log->l_iclog_hsize;
3484
Tim Shimmin32fb9b52005-09-02 16:41:43 +10003485 /* for roundoff padding for transaction data and one for commit record */
Eric Sandeen62118702008-03-06 13:44:28 +11003486 if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) &&
Tim Shimmin32fb9b52005-09-02 16:41:43 +10003487 log->l_mp->m_sb.sb_logsunit > 1) {
3488 /* log su roundoff */
3489 unit_bytes += 2*log->l_mp->m_sb.sb_logsunit;
3490 } else {
3491 /* BB roundoff */
3492 unit_bytes += 2*BBSIZE;
3493 }
3494
Dave Chinnercc09c0d2008-11-17 17:37:10 +11003495 atomic_set(&tic->t_ref, 1);
Christoph Hellwig14a72352012-02-20 02:31:24 +00003496 tic->t_task = current;
Dave Chinner10547942010-12-21 12:02:25 +11003497 INIT_LIST_HEAD(&tic->t_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003498 tic->t_unit_res = unit_bytes;
3499 tic->t_curr_res = unit_bytes;
3500 tic->t_cnt = cnt;
3501 tic->t_ocnt = cnt;
Akinobu Mitaecb34032013-03-04 21:58:20 +09003502 tic->t_tid = prandom_u32();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003503 tic->t_clientid = client;
3504 tic->t_flags = XLOG_TIC_INITED;
Tim Shimmin7e9c6392005-09-02 16:42:05 +10003505 tic->t_trans_type = 0;
Christoph Hellwig9006fb92012-02-20 02:31:31 +00003506 if (permanent)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003507 tic->t_flags |= XLOG_TIC_PERM_RESERV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003508
Christoph Hellwig0adba532007-08-30 17:21:46 +10003509 xlog_tic_reset_res(tic);
Tim Shimmin7e9c6392005-09-02 16:42:05 +10003510
Linus Torvalds1da177e2005-04-16 15:20:36 -07003511 return tic;
Dave Chinnercc09c0d2008-11-17 17:37:10 +11003512}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003513
3514
3515/******************************************************************************
3516 *
3517 * Log debug routines
3518 *
3519 ******************************************************************************
3520 */
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11003521#if defined(DEBUG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003522/*
3523 * Make sure that the destination ptr is within the valid data region of
3524 * one of the iclogs. This uses backup pointers stored in a different
3525 * part of the log in case we trash the log structure.
3526 */
3527void
Christoph Hellwige6b1f272010-03-23 11:47:38 +11003528xlog_verify_dest_ptr(
Mark Tinguelyad223e62012-06-14 09:22:15 -05003529 struct xlog *log,
Christoph Hellwige6b1f272010-03-23 11:47:38 +11003530 char *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003531{
3532 int i;
3533 int good_ptr = 0;
3534
Christoph Hellwige6b1f272010-03-23 11:47:38 +11003535 for (i = 0; i < log->l_iclog_bufs; i++) {
3536 if (ptr >= log->l_iclog_bak[i] &&
3537 ptr <= log->l_iclog_bak[i] + log->l_iclog_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003538 good_ptr++;
3539 }
Christoph Hellwige6b1f272010-03-23 11:47:38 +11003540
3541 if (!good_ptr)
Dave Chinnera0fa2b62011-03-07 10:01:35 +11003542 xfs_emerg(log->l_mp, "%s: invalid ptr", __func__);
Christoph Hellwige6b1f272010-03-23 11:47:38 +11003543}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003544
Dave Chinnerda8a1a42011-04-08 12:45:07 +10003545/*
3546 * Check to make sure the grant write head didn't just over lap the tail. If
3547 * the cycles are the same, we can't be overlapping. Otherwise, make sure that
3548 * the cycles differ by exactly one and check the byte count.
3549 *
3550 * This check is run unlocked, so can give false positives. Rather than assert
3551 * on failures, use a warn-once flag and a panic tag to allow the admin to
3552 * determine if they want to panic the machine when such an error occurs. For
3553 * debug kernels this will have the same effect as using an assert but, unlinke
3554 * an assert, it can be turned off at runtime.
3555 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003556STATIC void
Dave Chinner3f336c62010-12-21 12:02:52 +11003557xlog_verify_grant_tail(
Mark Tinguelyad223e62012-06-14 09:22:15 -05003558 struct xlog *log)
Dave Chinner3f336c62010-12-21 12:02:52 +11003559{
Dave Chinner1c3cb9e2010-12-21 12:28:39 +11003560 int tail_cycle, tail_blocks;
Dave Chinnera69ed032010-12-21 12:08:20 +11003561 int cycle, space;
Dave Chinner3f336c62010-12-21 12:02:52 +11003562
Christoph Hellwig28496962012-02-20 02:31:25 +00003563 xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &space);
Dave Chinner1c3cb9e2010-12-21 12:28:39 +11003564 xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_blocks);
3565 if (tail_cycle != cycle) {
Dave Chinnerda8a1a42011-04-08 12:45:07 +10003566 if (cycle - 1 != tail_cycle &&
3567 !(log->l_flags & XLOG_TAIL_WARN)) {
3568 xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES,
3569 "%s: cycle - 1 != tail_cycle", __func__);
3570 log->l_flags |= XLOG_TAIL_WARN;
3571 }
3572
3573 if (space > BBTOB(tail_blocks) &&
3574 !(log->l_flags & XLOG_TAIL_WARN)) {
3575 xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES,
3576 "%s: space > BBTOB(tail_blocks)", __func__);
3577 log->l_flags |= XLOG_TAIL_WARN;
3578 }
Dave Chinner3f336c62010-12-21 12:02:52 +11003579 }
3580}
3581
Linus Torvalds1da177e2005-04-16 15:20:36 -07003582/* check if it will fit */
3583STATIC void
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05003584xlog_verify_tail_lsn(
3585 struct xlog *log,
3586 struct xlog_in_core *iclog,
3587 xfs_lsn_t tail_lsn)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003588{
3589 int blocks;
3590
3591 if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) {
3592 blocks =
3593 log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn));
3594 if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize))
Dave Chinnera0fa2b62011-03-07 10:01:35 +11003595 xfs_emerg(log->l_mp, "%s: ran out of log space", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003596 } else {
3597 ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle);
3598
3599 if (BLOCK_LSN(tail_lsn) == log->l_prev_block)
Dave Chinnera0fa2b62011-03-07 10:01:35 +11003600 xfs_emerg(log->l_mp, "%s: tail wrapped", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003601
3602 blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block;
3603 if (blocks < BTOBB(iclog->ic_offset) + 1)
Dave Chinnera0fa2b62011-03-07 10:01:35 +11003604 xfs_emerg(log->l_mp, "%s: ran out of log space", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003605 }
3606} /* xlog_verify_tail_lsn */
3607
3608/*
3609 * Perform a number of checks on the iclog before writing to disk.
3610 *
3611 * 1. Make sure the iclogs are still circular
3612 * 2. Make sure we have a good magic number
3613 * 3. Make sure we don't have magic numbers in the data
3614 * 4. Check fields of each log operation header for:
3615 * A. Valid client identifier
3616 * B. tid ptr value falls in valid ptr space (user space code)
3617 * C. Length in log record header is correct according to the
3618 * individual operation headers within record.
3619 * 5. When a bwrite will occur within 5 blocks of the front of the physical
3620 * log, check the preceding blocks of the physical log to make sure all
3621 * the cycle numbers agree with the current cycle number.
3622 */
3623STATIC void
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05003624xlog_verify_iclog(
3625 struct xlog *log,
3626 struct xlog_in_core *iclog,
3627 int count,
Thiago Farina667a9292012-11-12 21:32:59 -02003628 bool syncing)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003629{
3630 xlog_op_header_t *ophead;
3631 xlog_in_core_t *icptr;
3632 xlog_in_core_2_t *xhdr;
3633 xfs_caddr_t ptr;
3634 xfs_caddr_t base_ptr;
3635 __psint_t field_offset;
3636 __uint8_t clientid;
3637 int len, i, j, k, op_len;
3638 int idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003639
3640 /* check validity of iclog pointers */
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003641 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003642 icptr = log->l_iclog;
3643 for (i=0; i < log->l_iclog_bufs; i++) {
Christoph Hellwig4b809162007-08-16 15:37:36 +10003644 if (icptr == NULL)
Dave Chinnera0fa2b62011-03-07 10:01:35 +11003645 xfs_emerg(log->l_mp, "%s: invalid ptr", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003646 icptr = icptr->ic_next;
3647 }
3648 if (icptr != log->l_iclog)
Dave Chinnera0fa2b62011-03-07 10:01:35 +11003649 xfs_emerg(log->l_mp, "%s: corrupt iclog ring", __func__);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003650 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003651
3652 /* check log magic numbers */
Christoph Hellwig69ef9212011-07-08 14:36:05 +02003653 if (iclog->ic_header.h_magicno != cpu_to_be32(XLOG_HEADER_MAGIC_NUM))
Dave Chinnera0fa2b62011-03-07 10:01:35 +11003654 xfs_emerg(log->l_mp, "%s: invalid magic num", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003655
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003656 ptr = (xfs_caddr_t) &iclog->ic_header;
3657 for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&iclog->ic_header) + count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003658 ptr += BBSIZE) {
Christoph Hellwig69ef9212011-07-08 14:36:05 +02003659 if (*(__be32 *)ptr == cpu_to_be32(XLOG_HEADER_MAGIC_NUM))
Dave Chinnera0fa2b62011-03-07 10:01:35 +11003660 xfs_emerg(log->l_mp, "%s: unexpected magic num",
3661 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003662 }
3663
3664 /* check fields */
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003665 len = be32_to_cpu(iclog->ic_header.h_num_logops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003666 ptr = iclog->ic_datap;
3667 base_ptr = ptr;
3668 ophead = (xlog_op_header_t *)ptr;
Christoph Hellwigb28708d2008-11-28 14:23:38 +11003669 xhdr = iclog->ic_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003670 for (i = 0; i < len; i++) {
3671 ophead = (xlog_op_header_t *)ptr;
3672
3673 /* clientid is only 1 byte */
3674 field_offset = (__psint_t)
3675 ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr);
Thiago Farina667a9292012-11-12 21:32:59 -02003676 if (!syncing || (field_offset & 0x1ff)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003677 clientid = ophead->oh_clientid;
3678 } else {
3679 idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap);
3680 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) {
3681 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
3682 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
Christoph Hellwig03bea6f2007-10-12 10:58:05 +10003683 clientid = xlog_get_client_id(
3684 xhdr[j].hic_xheader.xh_cycle_data[k]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003685 } else {
Christoph Hellwig03bea6f2007-10-12 10:58:05 +10003686 clientid = xlog_get_client_id(
3687 iclog->ic_header.h_cycle_data[idx]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003688 }
3689 }
3690 if (clientid != XFS_TRANSACTION && clientid != XFS_LOG)
Dave Chinnera0fa2b62011-03-07 10:01:35 +11003691 xfs_warn(log->l_mp,
3692 "%s: invalid clientid %d op 0x%p offset 0x%lx",
3693 __func__, clientid, ophead,
3694 (unsigned long)field_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003695
3696 /* check length */
3697 field_offset = (__psint_t)
3698 ((xfs_caddr_t)&(ophead->oh_len) - base_ptr);
Thiago Farina667a9292012-11-12 21:32:59 -02003699 if (!syncing || (field_offset & 0x1ff)) {
Christoph Hellwig67fcb7b2007-10-12 10:58:59 +10003700 op_len = be32_to_cpu(ophead->oh_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003701 } else {
3702 idx = BTOBBT((__psint_t)&ophead->oh_len -
3703 (__psint_t)iclog->ic_datap);
3704 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) {
3705 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
3706 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003707 op_len = be32_to_cpu(xhdr[j].hic_xheader.xh_cycle_data[k]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003708 } else {
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003709 op_len = be32_to_cpu(iclog->ic_header.h_cycle_data[idx]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003710 }
3711 }
3712 ptr += sizeof(xlog_op_header_t) + op_len;
3713 }
3714} /* xlog_verify_iclog */
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11003715#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003716
3717/*
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003718 * Mark all iclogs IOERROR. l_icloglock is held by the caller.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003719 */
3720STATIC int
3721xlog_state_ioerror(
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05003722 struct xlog *log)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003723{
3724 xlog_in_core_t *iclog, *ic;
3725
3726 iclog = log->l_iclog;
3727 if (! (iclog->ic_state & XLOG_STATE_IOERROR)) {
3728 /*
3729 * Mark all the incore logs IOERROR.
3730 * From now on, no log flushes will result.
3731 */
3732 ic = iclog;
3733 do {
3734 ic->ic_state = XLOG_STATE_IOERROR;
3735 ic = ic->ic_next;
3736 } while (ic != iclog);
Jesper Juhl014c2542006-01-15 02:37:08 +01003737 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003738 }
3739 /*
3740 * Return non-zero, if state transition has already happened.
3741 */
Jesper Juhl014c2542006-01-15 02:37:08 +01003742 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003743}
3744
3745/*
3746 * This is called from xfs_force_shutdown, when we're forcibly
3747 * shutting down the filesystem, typically because of an IO error.
3748 * Our main objectives here are to make sure that:
3749 * a. the filesystem gets marked 'SHUTDOWN' for all interested
3750 * parties to find out, 'atomically'.
3751 * b. those who're sleeping on log reservations, pinned objects and
3752 * other resources get woken up, and be told the bad news.
3753 * c. nothing new gets queued up after (a) and (b) are done.
3754 * d. if !logerror, flush the iclogs to disk, then seal them off
3755 * for business.
Dave Chinner9da1ab12010-05-17 15:51:59 +10003756 *
3757 * Note: for delayed logging the !logerror case needs to flush the regions
3758 * held in memory out to the iclogs before flushing them to disk. This needs
3759 * to be done before the log is marked as shutdown, otherwise the flush to the
3760 * iclogs will fail.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003761 */
3762int
3763xfs_log_force_umount(
3764 struct xfs_mount *mp,
3765 int logerror)
3766{
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05003767 struct xlog *log;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003768 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003769
3770 log = mp->m_log;
3771
3772 /*
3773 * If this happens during log recovery, don't worry about
3774 * locking; the log isn't open for business yet.
3775 */
3776 if (!log ||
3777 log->l_flags & XLOG_ACTIVE_RECOVERY) {
3778 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN;
Christoph Hellwigbac8dca2008-11-28 14:23:31 +11003779 if (mp->m_sb_bp)
3780 XFS_BUF_DONE(mp->m_sb_bp);
Jesper Juhl014c2542006-01-15 02:37:08 +01003781 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003782 }
3783
3784 /*
3785 * Somebody could've already done the hard work for us.
3786 * No need to get locks for this.
3787 */
3788 if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) {
3789 ASSERT(XLOG_FORCED_SHUTDOWN(log));
Jesper Juhl014c2542006-01-15 02:37:08 +01003790 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003791 }
3792 retval = 0;
Dave Chinner9da1ab12010-05-17 15:51:59 +10003793
3794 /*
3795 * Flush the in memory commit item list before marking the log as
3796 * being shut down. We need to do it in this order to ensure all the
3797 * completed transactions are flushed to disk with the xfs_log_force()
3798 * call below.
3799 */
Christoph Hellwig93b8a582011-12-06 21:58:07 +00003800 if (!logerror)
Dave Chinnera44f13e2010-08-24 11:40:03 +10003801 xlog_cil_force(log);
Dave Chinner9da1ab12010-05-17 15:51:59 +10003802
Linus Torvalds1da177e2005-04-16 15:20:36 -07003803 /*
Dave Chinner3f16b982010-12-21 12:29:01 +11003804 * mark the filesystem and the as in a shutdown state and wake
3805 * everybody up to tell them the bad news.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003806 */
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003807 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003808 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN;
Christoph Hellwigbac8dca2008-11-28 14:23:31 +11003809 if (mp->m_sb_bp)
3810 XFS_BUF_DONE(mp->m_sb_bp);
3811
Linus Torvalds1da177e2005-04-16 15:20:36 -07003812 /*
3813 * This flag is sort of redundant because of the mount flag, but
3814 * it's good to maintain the separation between the log and the rest
3815 * of XFS.
3816 */
3817 log->l_flags |= XLOG_IO_ERROR;
3818
3819 /*
3820 * If we hit a log error, we want to mark all the iclogs IOERROR
3821 * while we're still holding the loglock.
3822 */
3823 if (logerror)
3824 retval = xlog_state_ioerror(log);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003825 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003826
3827 /*
Dave Chinner10547942010-12-21 12:02:25 +11003828 * We don't want anybody waiting for log reservations after this. That
3829 * means we have to wake up everybody queued up on reserveq as well as
3830 * writeq. In addition, we make sure in xlog_{re}grant_log_space that
3831 * we don't enqueue anything once the SHUTDOWN flag is set, and this
Dave Chinner3f16b982010-12-21 12:29:01 +11003832 * action is protected by the grant locks.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003833 */
Christoph Hellwiga79bf2d2012-02-20 02:31:27 +00003834 xlog_grant_head_wake_all(&log->l_reserve_head);
3835 xlog_grant_head_wake_all(&log->l_write_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003836
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003837 if (!(log->l_iclog->ic_state & XLOG_STATE_IOERROR)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003838 ASSERT(!logerror);
3839 /*
3840 * Force the incore logs to disk before shutting the
3841 * log down completely.
3842 */
Christoph Hellwiga14a3482010-01-19 09:56:46 +00003843 _xfs_log_force(mp, XFS_LOG_SYNC, NULL);
3844
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003845 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003846 retval = xlog_state_ioerror(log);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003847 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003848 }
3849 /*
3850 * Wake up everybody waiting on xfs_log_force.
3851 * Callback all log item committed functions as if the
3852 * log writes were completed.
3853 */
3854 xlog_state_do_callback(log, XFS_LI_ABORTED, NULL);
3855
3856#ifdef XFSERRORDEBUG
3857 {
3858 xlog_in_core_t *iclog;
3859
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003860 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003861 iclog = log->l_iclog;
3862 do {
3863 ASSERT(iclog->ic_callback == 0);
3864 iclog = iclog->ic_next;
3865 } while (iclog != log->l_iclog);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003866 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003867 }
3868#endif
3869 /* return non-zero if log IOERROR transition had already happened */
Jesper Juhl014c2542006-01-15 02:37:08 +01003870 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003871}
3872
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10003873STATIC int
Mark Tinguely9a8d2fd2012-06-14 09:22:16 -05003874xlog_iclogs_empty(
3875 struct xlog *log)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003876{
3877 xlog_in_core_t *iclog;
3878
3879 iclog = log->l_iclog;
3880 do {
3881 /* endianness does not matter here, zero is zero in
3882 * any language.
3883 */
3884 if (iclog->ic_header.h_num_logops)
Jesper Juhl014c2542006-01-15 02:37:08 +01003885 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003886 iclog = iclog->ic_next;
3887 } while (iclog != log->l_iclog);
Jesper Juhl014c2542006-01-15 02:37:08 +01003888 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003889}
Dave Chinnerf661f1e2012-10-08 21:56:02 +11003890