1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * bcachefs journalling code, for btree insertions
4 *
5 * Copyright 2012 Google, Inc.
6 */
7
8 #include "bcachefs.h"
9 #include "alloc_foreground.h"
10 #include "bkey_methods.h"
11 #include "btree_gc.h"
12 #include "btree_update.h"
13 #include "btree_write_buffer.h"
14 #include "buckets.h"
15 #include "error.h"
16 #include "journal.h"
17 #include "journal_io.h"
18 #include "journal_reclaim.h"
19 #include "journal_sb.h"
20 #include "journal_seq_blacklist.h"
21 #include "trace.h"
22
23 static const char * const bch2_journal_errors[] = {
24 #define x(n) #n,
25 JOURNAL_ERRORS()
26 #undef x
27 NULL
28 };
29
journal_seq_unwritten(struct journal * j,u64 seq)30 static inline bool journal_seq_unwritten(struct journal *j, u64 seq)
31 {
32 return seq > j->seq_ondisk;
33 }
34
__journal_entry_is_open(union journal_res_state state)35 static bool __journal_entry_is_open(union journal_res_state state)
36 {
37 return state.cur_entry_offset < JOURNAL_ENTRY_CLOSED_VAL;
38 }
39
nr_unwritten_journal_entries(struct journal * j)40 static inline unsigned nr_unwritten_journal_entries(struct journal *j)
41 {
42 return atomic64_read(&j->seq) - j->seq_ondisk;
43 }
44
journal_entry_is_open(struct journal * j)45 static bool journal_entry_is_open(struct journal *j)
46 {
47 return __journal_entry_is_open(j->reservations);
48 }
49
bch2_journal_buf_to_text(struct printbuf * out,struct journal * j,u64 seq)50 static void bch2_journal_buf_to_text(struct printbuf *out, struct journal *j, u64 seq)
51 {
52 union journal_res_state s = READ_ONCE(j->reservations);
53 unsigned i = seq & JOURNAL_BUF_MASK;
54 struct journal_buf *buf = j->buf + i;
55
56 prt_printf(out, "seq:\t%llu\n", seq);
57 printbuf_indent_add(out, 2);
58
59 prt_printf(out, "refcount:\t%u\n", journal_state_count(s, i));
60
61 prt_printf(out, "size:\t");
62 prt_human_readable_u64(out, vstruct_bytes(buf->data));
63 prt_newline(out);
64
65 prt_printf(out, "expires:\t");
66 prt_printf(out, "%li jiffies\n", buf->expires - jiffies);
67
68 prt_printf(out, "flags:\t");
69 if (buf->noflush)
70 prt_str(out, "noflush ");
71 if (buf->must_flush)
72 prt_str(out, "must_flush ");
73 if (buf->separate_flush)
74 prt_str(out, "separate_flush ");
75 if (buf->need_flush_to_write_buffer)
76 prt_str(out, "need_flush_to_write_buffer ");
77 if (buf->write_started)
78 prt_str(out, "write_started ");
79 if (buf->write_allocated)
80 prt_str(out, "write_allocated ");
81 if (buf->write_done)
82 prt_str(out, "write_done");
83 prt_newline(out);
84
85 printbuf_indent_sub(out, 2);
86 }
87
bch2_journal_bufs_to_text(struct printbuf * out,struct journal * j)88 static void bch2_journal_bufs_to_text(struct printbuf *out, struct journal *j)
89 {
90 if (!out->nr_tabstops)
91 printbuf_tabstop_push(out, 24);
92
93 for (u64 seq = journal_last_unwritten_seq(j);
94 seq <= journal_cur_seq(j);
95 seq++)
96 bch2_journal_buf_to_text(out, j, seq);
97 prt_printf(out, "last buf %s\n", journal_entry_is_open(j) ? "open" : "closed");
98 }
99
100 static inline struct journal_buf *
journal_seq_to_buf(struct journal * j,u64 seq)101 journal_seq_to_buf(struct journal *j, u64 seq)
102 {
103 struct journal_buf *buf = NULL;
104
105 EBUG_ON(seq > journal_cur_seq(j));
106
107 if (journal_seq_unwritten(j, seq)) {
108 buf = j->buf + (seq & JOURNAL_BUF_MASK);
109 EBUG_ON(le64_to_cpu(buf->data->seq) != seq);
110 }
111 return buf;
112 }
113
journal_pin_list_init(struct journal_entry_pin_list * p,int count)114 static void journal_pin_list_init(struct journal_entry_pin_list *p, int count)
115 {
116 unsigned i;
117
118 for (i = 0; i < ARRAY_SIZE(p->list); i++)
119 INIT_LIST_HEAD(&p->list[i]);
120 INIT_LIST_HEAD(&p->flushed);
121 atomic_set(&p->count, count);
122 p->devs.nr = 0;
123 }
124
125 /*
126 * Detect stuck journal conditions and trigger shutdown. Technically the journal
127 * can end up stuck for a variety of reasons, such as a blocked I/O, journal
128 * reservation lockup, etc. Since this is a fatal error with potentially
129 * unpredictable characteristics, we want to be fairly conservative before we
130 * decide to shut things down.
131 *
132 * Consider the journal stuck when it appears full with no ability to commit
133 * btree transactions, to discard journal buckets, nor acquire priority
134 * (reserved watermark) reservation.
135 */
136 static inline bool
journal_error_check_stuck(struct journal * j,int error,unsigned flags)137 journal_error_check_stuck(struct journal *j, int error, unsigned flags)
138 {
139 struct bch_fs *c = container_of(j, struct bch_fs, journal);
140 bool stuck = false;
141 struct printbuf buf = PRINTBUF;
142
143 if (!(error == JOURNAL_ERR_journal_full ||
144 error == JOURNAL_ERR_journal_pin_full) ||
145 nr_unwritten_journal_entries(j) ||
146 (flags & BCH_WATERMARK_MASK) != BCH_WATERMARK_reclaim)
147 return stuck;
148
149 spin_lock(&j->lock);
150
151 if (j->can_discard) {
152 spin_unlock(&j->lock);
153 return stuck;
154 }
155
156 stuck = true;
157
158 /*
159 * The journal shutdown path will set ->err_seq, but do it here first to
160 * serialize against concurrent failures and avoid duplicate error
161 * reports.
162 */
163 if (j->err_seq) {
164 spin_unlock(&j->lock);
165 return stuck;
166 }
167 j->err_seq = journal_cur_seq(j);
168 spin_unlock(&j->lock);
169
170 bch_err(c, "Journal stuck! Hava a pre-reservation but journal full (error %s)",
171 bch2_journal_errors[error]);
172 bch2_journal_debug_to_text(&buf, j);
173 bch_err(c, "%s", buf.buf);
174
175 printbuf_reset(&buf);
176 bch2_journal_pins_to_text(&buf, j);
177 bch_err(c, "Journal pins:\n%s", buf.buf);
178 printbuf_exit(&buf);
179
180 bch2_fatal_error(c);
181 dump_stack();
182
183 return stuck;
184 }
185
bch2_journal_do_writes(struct journal * j)186 void bch2_journal_do_writes(struct journal *j)
187 {
188 for (u64 seq = journal_last_unwritten_seq(j);
189 seq <= journal_cur_seq(j);
190 seq++) {
191 unsigned idx = seq & JOURNAL_BUF_MASK;
192 struct journal_buf *w = j->buf + idx;
193
194 if (w->write_started && !w->write_allocated)
195 break;
196 if (w->write_started)
197 continue;
198
199 if (!journal_state_count(j->reservations, idx)) {
200 w->write_started = true;
201 closure_call(&w->io, bch2_journal_write, j->wq, NULL);
202 }
203
204 break;
205 }
206 }
207
208 /*
209 * Final processing when the last reference of a journal buffer has been
210 * dropped. Drop the pin list reference acquired at journal entry open and write
211 * the buffer, if requested.
212 */
bch2_journal_buf_put_final(struct journal * j,u64 seq)213 void bch2_journal_buf_put_final(struct journal *j, u64 seq)
214 {
215 lockdep_assert_held(&j->lock);
216
217 if (__bch2_journal_pin_put(j, seq))
218 bch2_journal_reclaim_fast(j);
219 bch2_journal_do_writes(j);
220 }
221
222 /*
223 * Returns true if journal entry is now closed:
224 *
225 * We don't close a journal_buf until the next journal_buf is finished writing,
226 * and can be opened again - this also initializes the next journal_buf:
227 */
__journal_entry_close(struct journal * j,unsigned closed_val,bool trace)228 static void __journal_entry_close(struct journal *j, unsigned closed_val, bool trace)
229 {
230 struct bch_fs *c = container_of(j, struct bch_fs, journal);
231 struct journal_buf *buf = journal_cur_buf(j);
232 union journal_res_state old, new;
233 u64 v = atomic64_read(&j->reservations.counter);
234 unsigned sectors;
235
236 BUG_ON(closed_val != JOURNAL_ENTRY_CLOSED_VAL &&
237 closed_val != JOURNAL_ENTRY_ERROR_VAL);
238
239 lockdep_assert_held(&j->lock);
240
241 do {
242 old.v = new.v = v;
243 new.cur_entry_offset = closed_val;
244
245 if (old.cur_entry_offset == JOURNAL_ENTRY_ERROR_VAL ||
246 old.cur_entry_offset == new.cur_entry_offset)
247 return;
248 } while ((v = atomic64_cmpxchg(&j->reservations.counter,
249 old.v, new.v)) != old.v);
250
251 if (!__journal_entry_is_open(old))
252 return;
253
254 /* Close out old buffer: */
255 buf->data->u64s = cpu_to_le32(old.cur_entry_offset);
256
257 if (trace_journal_entry_close_enabled() && trace) {
258 struct printbuf pbuf = PRINTBUF;
259 pbuf.atomic++;
260
261 prt_str(&pbuf, "entry size: ");
262 prt_human_readable_u64(&pbuf, vstruct_bytes(buf->data));
263 prt_newline(&pbuf);
264 bch2_prt_task_backtrace(&pbuf, current, 1, GFP_NOWAIT);
265 trace_journal_entry_close(c, pbuf.buf);
266 printbuf_exit(&pbuf);
267 }
268
269 sectors = vstruct_blocks_plus(buf->data, c->block_bits,
270 buf->u64s_reserved) << c->block_bits;
271 BUG_ON(sectors > buf->sectors);
272 buf->sectors = sectors;
273
274 /*
275 * We have to set last_seq here, _before_ opening a new journal entry:
276 *
277 * A threads may replace an old pin with a new pin on their current
278 * journal reservation - the expectation being that the journal will
279 * contain either what the old pin protected or what the new pin
280 * protects.
281 *
282 * After the old pin is dropped journal_last_seq() won't include the old
283 * pin, so we can only write the updated last_seq on the entry that
284 * contains whatever the new pin protects.
285 *
286 * Restated, we can _not_ update last_seq for a given entry if there
287 * could be a newer entry open with reservations/pins that have been
288 * taken against it.
289 *
290 * Hence, we want update/set last_seq on the current journal entry right
291 * before we open a new one:
292 */
293 buf->last_seq = journal_last_seq(j);
294 buf->data->last_seq = cpu_to_le64(buf->last_seq);
295 BUG_ON(buf->last_seq > le64_to_cpu(buf->data->seq));
296
297 cancel_delayed_work(&j->write_work);
298
299 bch2_journal_space_available(j);
300
301 __bch2_journal_buf_put(j, old.idx, le64_to_cpu(buf->data->seq));
302 }
303
bch2_journal_halt(struct journal * j)304 void bch2_journal_halt(struct journal *j)
305 {
306 spin_lock(&j->lock);
307 __journal_entry_close(j, JOURNAL_ENTRY_ERROR_VAL, true);
308 if (!j->err_seq)
309 j->err_seq = journal_cur_seq(j);
310 journal_wake(j);
311 spin_unlock(&j->lock);
312 }
313
journal_entry_want_write(struct journal * j)314 static bool journal_entry_want_write(struct journal *j)
315 {
316 bool ret = !journal_entry_is_open(j) ||
317 journal_cur_seq(j) == journal_last_unwritten_seq(j);
318
319 /* Don't close it yet if we already have a write in flight: */
320 if (ret)
321 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true);
322 else if (nr_unwritten_journal_entries(j)) {
323 struct journal_buf *buf = journal_cur_buf(j);
324
325 if (!buf->flush_time) {
326 buf->flush_time = local_clock() ?: 1;
327 buf->expires = jiffies;
328 }
329 }
330
331 return ret;
332 }
333
bch2_journal_entry_close(struct journal * j)334 bool bch2_journal_entry_close(struct journal *j)
335 {
336 bool ret;
337
338 spin_lock(&j->lock);
339 ret = journal_entry_want_write(j);
340 spin_unlock(&j->lock);
341
342 return ret;
343 }
344
345 /*
346 * should _only_ called from journal_res_get() - when we actually want a
347 * journal reservation - journal entry is open means journal is dirty:
348 */
journal_entry_open(struct journal * j)349 static int journal_entry_open(struct journal *j)
350 {
351 struct bch_fs *c = container_of(j, struct bch_fs, journal);
352 struct journal_buf *buf = j->buf +
353 ((journal_cur_seq(j) + 1) & JOURNAL_BUF_MASK);
354 union journal_res_state old, new;
355 int u64s;
356 u64 v;
357
358 lockdep_assert_held(&j->lock);
359 BUG_ON(journal_entry_is_open(j));
360 BUG_ON(BCH_SB_CLEAN(c->disk_sb.sb));
361
362 if (j->blocked)
363 return JOURNAL_ERR_blocked;
364
365 if (j->cur_entry_error)
366 return j->cur_entry_error;
367
368 if (bch2_journal_error(j))
369 return JOURNAL_ERR_insufficient_devices; /* -EROFS */
370
371 if (!fifo_free(&j->pin))
372 return JOURNAL_ERR_journal_pin_full;
373
374 if (nr_unwritten_journal_entries(j) == ARRAY_SIZE(j->buf))
375 return JOURNAL_ERR_max_in_flight;
376
377 BUG_ON(!j->cur_entry_sectors);
378
379 buf->expires =
380 (journal_cur_seq(j) == j->flushed_seq_ondisk
381 ? jiffies
382 : j->last_flush_write) +
383 msecs_to_jiffies(c->opts.journal_flush_delay);
384
385 buf->u64s_reserved = j->entry_u64s_reserved;
386 buf->disk_sectors = j->cur_entry_sectors;
387 buf->sectors = min(buf->disk_sectors, buf->buf_size >> 9);
388
389 u64s = (int) (buf->sectors << 9) / sizeof(u64) -
390 journal_entry_overhead(j);
391 u64s = clamp_t(int, u64s, 0, JOURNAL_ENTRY_CLOSED_VAL - 1);
392
393 if (u64s <= (ssize_t) j->early_journal_entries.nr)
394 return JOURNAL_ERR_journal_full;
395
396 if (fifo_empty(&j->pin) && j->reclaim_thread)
397 wake_up_process(j->reclaim_thread);
398
399 /*
400 * The fifo_push() needs to happen at the same time as j->seq is
401 * incremented for journal_last_seq() to be calculated correctly
402 */
403 atomic64_inc(&j->seq);
404 journal_pin_list_init(fifo_push_ref(&j->pin), 1);
405
406 BUG_ON(j->pin.back - 1 != atomic64_read(&j->seq));
407
408 BUG_ON(j->buf + (journal_cur_seq(j) & JOURNAL_BUF_MASK) != buf);
409
410 bkey_extent_init(&buf->key);
411 buf->noflush = false;
412 buf->must_flush = false;
413 buf->separate_flush = false;
414 buf->flush_time = 0;
415 buf->need_flush_to_write_buffer = true;
416 buf->write_started = false;
417 buf->write_allocated = false;
418 buf->write_done = false;
419
420 memset(buf->data, 0, sizeof(*buf->data));
421 buf->data->seq = cpu_to_le64(journal_cur_seq(j));
422 buf->data->u64s = 0;
423
424 if (j->early_journal_entries.nr) {
425 memcpy(buf->data->_data, j->early_journal_entries.data,
426 j->early_journal_entries.nr * sizeof(u64));
427 le32_add_cpu(&buf->data->u64s, j->early_journal_entries.nr);
428 }
429
430 /*
431 * Must be set before marking the journal entry as open:
432 */
433 j->cur_entry_u64s = u64s;
434
435 v = atomic64_read(&j->reservations.counter);
436 do {
437 old.v = new.v = v;
438
439 BUG_ON(old.cur_entry_offset == JOURNAL_ENTRY_ERROR_VAL);
440
441 new.idx++;
442 BUG_ON(journal_state_count(new, new.idx));
443 BUG_ON(new.idx != (journal_cur_seq(j) & JOURNAL_BUF_MASK));
444
445 journal_state_inc(&new);
446
447 /* Handle any already added entries */
448 new.cur_entry_offset = le32_to_cpu(buf->data->u64s);
449 } while ((v = atomic64_cmpxchg(&j->reservations.counter,
450 old.v, new.v)) != old.v);
451
452 if (nr_unwritten_journal_entries(j) == 1)
453 mod_delayed_work(j->wq,
454 &j->write_work,
455 msecs_to_jiffies(c->opts.journal_flush_delay));
456 journal_wake(j);
457
458 if (j->early_journal_entries.nr)
459 darray_exit(&j->early_journal_entries);
460 return 0;
461 }
462
journal_quiesced(struct journal * j)463 static bool journal_quiesced(struct journal *j)
464 {
465 bool ret = atomic64_read(&j->seq) == j->seq_ondisk;
466
467 if (!ret)
468 bch2_journal_entry_close(j);
469 return ret;
470 }
471
journal_quiesce(struct journal * j)472 static void journal_quiesce(struct journal *j)
473 {
474 wait_event(j->wait, journal_quiesced(j));
475 }
476
journal_write_work(struct work_struct * work)477 static void journal_write_work(struct work_struct *work)
478 {
479 struct journal *j = container_of(work, struct journal, write_work.work);
480
481 spin_lock(&j->lock);
482 if (__journal_entry_is_open(j->reservations)) {
483 long delta = journal_cur_buf(j)->expires - jiffies;
484
485 if (delta > 0)
486 mod_delayed_work(j->wq, &j->write_work, delta);
487 else
488 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true);
489 }
490 spin_unlock(&j->lock);
491 }
492
__journal_res_get(struct journal * j,struct journal_res * res,unsigned flags)493 static int __journal_res_get(struct journal *j, struct journal_res *res,
494 unsigned flags)
495 {
496 struct bch_fs *c = container_of(j, struct bch_fs, journal);
497 struct journal_buf *buf;
498 bool can_discard;
499 int ret;
500 retry:
501 if (journal_res_get_fast(j, res, flags))
502 return 0;
503
504 if (bch2_journal_error(j))
505 return -BCH_ERR_erofs_journal_err;
506
507 if (j->blocked)
508 return -BCH_ERR_journal_res_get_blocked;
509
510 if ((flags & BCH_WATERMARK_MASK) < j->watermark) {
511 ret = JOURNAL_ERR_journal_full;
512 can_discard = j->can_discard;
513 goto out;
514 }
515
516 if (nr_unwritten_journal_entries(j) == ARRAY_SIZE(j->buf) && !journal_entry_is_open(j)) {
517 ret = JOURNAL_ERR_max_in_flight;
518 goto out;
519 }
520
521 spin_lock(&j->lock);
522
523 /*
524 * Recheck after taking the lock, so we don't race with another thread
525 * that just did journal_entry_open() and call bch2_journal_entry_close()
526 * unnecessarily
527 */
528 if (journal_res_get_fast(j, res, flags)) {
529 ret = 0;
530 goto unlock;
531 }
532
533 /*
534 * If we couldn't get a reservation because the current buf filled up,
535 * and we had room for a bigger entry on disk, signal that we want to
536 * realloc the journal bufs:
537 */
538 buf = journal_cur_buf(j);
539 if (journal_entry_is_open(j) &&
540 buf->buf_size >> 9 < buf->disk_sectors &&
541 buf->buf_size < JOURNAL_ENTRY_SIZE_MAX)
542 j->buf_size_want = max(j->buf_size_want, buf->buf_size << 1);
543
544 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, false);
545 ret = journal_entry_open(j) ?: JOURNAL_ERR_retry;
546 unlock:
547 can_discard = j->can_discard;
548 spin_unlock(&j->lock);
549 out:
550 if (ret == JOURNAL_ERR_retry)
551 goto retry;
552 if (!ret)
553 return 0;
554
555 if (journal_error_check_stuck(j, ret, flags))
556 ret = -BCH_ERR_journal_res_get_blocked;
557
558 if (ret == JOURNAL_ERR_max_in_flight &&
559 track_event_change(&c->times[BCH_TIME_blocked_journal_max_in_flight], true)) {
560
561 struct printbuf buf = PRINTBUF;
562 prt_printf(&buf, "seq %llu\n", journal_cur_seq(j));
563 bch2_journal_bufs_to_text(&buf, j);
564 trace_journal_entry_full(c, buf.buf);
565 printbuf_exit(&buf);
566 count_event(c, journal_entry_full);
567 }
568
569 /*
570 * Journal is full - can't rely on reclaim from work item due to
571 * freezing:
572 */
573 if ((ret == JOURNAL_ERR_journal_full ||
574 ret == JOURNAL_ERR_journal_pin_full) &&
575 !(flags & JOURNAL_RES_GET_NONBLOCK)) {
576 if (can_discard) {
577 bch2_journal_do_discards(j);
578 goto retry;
579 }
580
581 if (mutex_trylock(&j->reclaim_lock)) {
582 bch2_journal_reclaim(j);
583 mutex_unlock(&j->reclaim_lock);
584 }
585 }
586
587 return ret == JOURNAL_ERR_insufficient_devices
588 ? -BCH_ERR_erofs_journal_err
589 : -BCH_ERR_journal_res_get_blocked;
590 }
591
592 /*
593 * Essentially the entry function to the journaling code. When bcachefs is doing
594 * a btree insert, it calls this function to get the current journal write.
595 * Journal write is the structure used set up journal writes. The calling
596 * function will then add its keys to the structure, queuing them for the next
597 * write.
598 *
599 * To ensure forward progress, the current task must not be holding any
600 * btree node write locks.
601 */
bch2_journal_res_get_slowpath(struct journal * j,struct journal_res * res,unsigned flags)602 int bch2_journal_res_get_slowpath(struct journal *j, struct journal_res *res,
603 unsigned flags)
604 {
605 int ret;
606
607 closure_wait_event(&j->async_wait,
608 (ret = __journal_res_get(j, res, flags)) != -BCH_ERR_journal_res_get_blocked ||
609 (flags & JOURNAL_RES_GET_NONBLOCK));
610 return ret;
611 }
612
613 /* journal_entry_res: */
614
bch2_journal_entry_res_resize(struct journal * j,struct journal_entry_res * res,unsigned new_u64s)615 void bch2_journal_entry_res_resize(struct journal *j,
616 struct journal_entry_res *res,
617 unsigned new_u64s)
618 {
619 union journal_res_state state;
620 int d = new_u64s - res->u64s;
621
622 spin_lock(&j->lock);
623
624 j->entry_u64s_reserved += d;
625 if (d <= 0)
626 goto out;
627
628 j->cur_entry_u64s = max_t(int, 0, j->cur_entry_u64s - d);
629 smp_mb();
630 state = READ_ONCE(j->reservations);
631
632 if (state.cur_entry_offset < JOURNAL_ENTRY_CLOSED_VAL &&
633 state.cur_entry_offset > j->cur_entry_u64s) {
634 j->cur_entry_u64s += d;
635 /*
636 * Not enough room in current journal entry, have to flush it:
637 */
638 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true);
639 } else {
640 journal_cur_buf(j)->u64s_reserved += d;
641 }
642 out:
643 spin_unlock(&j->lock);
644 res->u64s += d;
645 }
646
647 /* journal flushing: */
648
649 /**
650 * bch2_journal_flush_seq_async - wait for a journal entry to be written
651 * @j: journal object
652 * @seq: seq to flush
653 * @parent: closure object to wait with
654 * Returns: 1 if @seq has already been flushed, 0 if @seq is being flushed,
655 * -EIO if @seq will never be flushed
656 *
657 * Like bch2_journal_wait_on_seq, except that it triggers a write immediately if
658 * necessary
659 */
bch2_journal_flush_seq_async(struct journal * j,u64 seq,struct closure * parent)660 int bch2_journal_flush_seq_async(struct journal *j, u64 seq,
661 struct closure *parent)
662 {
663 struct journal_buf *buf;
664 int ret = 0;
665
666 if (seq <= j->flushed_seq_ondisk)
667 return 1;
668
669 spin_lock(&j->lock);
670
671 if (WARN_ONCE(seq > journal_cur_seq(j),
672 "requested to flush journal seq %llu, but currently at %llu",
673 seq, journal_cur_seq(j)))
674 goto out;
675
676 /* Recheck under lock: */
677 if (j->err_seq && seq >= j->err_seq) {
678 ret = -EIO;
679 goto out;
680 }
681
682 if (seq <= j->flushed_seq_ondisk) {
683 ret = 1;
684 goto out;
685 }
686
687 /* if seq was written, but not flushed - flush a newer one instead */
688 seq = max(seq, journal_last_unwritten_seq(j));
689
690 recheck_need_open:
691 if (seq > journal_cur_seq(j)) {
692 struct journal_res res = { 0 };
693
694 if (journal_entry_is_open(j))
695 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true);
696
697 spin_unlock(&j->lock);
698
699 /*
700 * We're called from bch2_journal_flush_seq() -> wait_event();
701 * but this might block. We won't usually block, so we won't
702 * livelock:
703 */
704 sched_annotate_sleep();
705 ret = bch2_journal_res_get(j, &res, jset_u64s(0), 0);
706 if (ret)
707 return ret;
708
709 seq = res.seq;
710 buf = journal_seq_to_buf(j, seq);
711 buf->must_flush = true;
712
713 if (!buf->flush_time) {
714 buf->flush_time = local_clock() ?: 1;
715 buf->expires = jiffies;
716 }
717
718 if (parent && !closure_wait(&buf->wait, parent))
719 BUG();
720
721 bch2_journal_res_put(j, &res);
722
723 spin_lock(&j->lock);
724 goto want_write;
725 }
726
727 /*
728 * if write was kicked off without a flush, or if we promised it
729 * wouldn't be a flush, flush the next sequence number instead
730 */
731 buf = journal_seq_to_buf(j, seq);
732 if (buf->noflush) {
733 seq++;
734 goto recheck_need_open;
735 }
736
737 buf->must_flush = true;
738
739 if (parent && !closure_wait(&buf->wait, parent))
740 BUG();
741 want_write:
742 if (seq == journal_cur_seq(j))
743 journal_entry_want_write(j);
744 out:
745 spin_unlock(&j->lock);
746 return ret;
747 }
748
bch2_journal_flush_seq(struct journal * j,u64 seq)749 int bch2_journal_flush_seq(struct journal *j, u64 seq)
750 {
751 u64 start_time = local_clock();
752 int ret, ret2;
753
754 /*
755 * Don't update time_stats when @seq is already flushed:
756 */
757 if (seq <= j->flushed_seq_ondisk)
758 return 0;
759
760 ret = wait_event_interruptible(j->wait, (ret2 = bch2_journal_flush_seq_async(j, seq, NULL)));
761
762 if (!ret)
763 bch2_time_stats_update(j->flush_seq_time, start_time);
764
765 return ret ?: ret2 < 0 ? ret2 : 0;
766 }
767
768 /*
769 * bch2_journal_flush_async - if there is an open journal entry, or a journal
770 * still being written, write it and wait for the write to complete
771 */
bch2_journal_flush_async(struct journal * j,struct closure * parent)772 void bch2_journal_flush_async(struct journal *j, struct closure *parent)
773 {
774 bch2_journal_flush_seq_async(j, atomic64_read(&j->seq), parent);
775 }
776
bch2_journal_flush(struct journal * j)777 int bch2_journal_flush(struct journal *j)
778 {
779 return bch2_journal_flush_seq(j, atomic64_read(&j->seq));
780 }
781
782 /*
783 * bch2_journal_noflush_seq - tell the journal not to issue any flushes before
784 * @seq
785 */
bch2_journal_noflush_seq(struct journal * j,u64 seq)786 bool bch2_journal_noflush_seq(struct journal *j, u64 seq)
787 {
788 struct bch_fs *c = container_of(j, struct bch_fs, journal);
789 u64 unwritten_seq;
790 bool ret = false;
791
792 if (!(c->sb.features & (1ULL << BCH_FEATURE_journal_no_flush)))
793 return false;
794
795 if (seq <= c->journal.flushed_seq_ondisk)
796 return false;
797
798 spin_lock(&j->lock);
799 if (seq <= c->journal.flushed_seq_ondisk)
800 goto out;
801
802 for (unwritten_seq = journal_last_unwritten_seq(j);
803 unwritten_seq < seq;
804 unwritten_seq++) {
805 struct journal_buf *buf = journal_seq_to_buf(j, unwritten_seq);
806
807 /* journal flush already in flight, or flush requseted */
808 if (buf->must_flush)
809 goto out;
810
811 buf->noflush = true;
812 }
813
814 ret = true;
815 out:
816 spin_unlock(&j->lock);
817 return ret;
818 }
819
bch2_journal_meta(struct journal * j)820 int bch2_journal_meta(struct journal *j)
821 {
822 struct journal_buf *buf;
823 struct journal_res res;
824 int ret;
825
826 memset(&res, 0, sizeof(res));
827
828 ret = bch2_journal_res_get(j, &res, jset_u64s(0), 0);
829 if (ret)
830 return ret;
831
832 buf = j->buf + (res.seq & JOURNAL_BUF_MASK);
833 buf->must_flush = true;
834
835 if (!buf->flush_time) {
836 buf->flush_time = local_clock() ?: 1;
837 buf->expires = jiffies;
838 }
839
840 bch2_journal_res_put(j, &res);
841
842 return bch2_journal_flush_seq(j, res.seq);
843 }
844
845 /* block/unlock the journal: */
846
bch2_journal_unblock(struct journal * j)847 void bch2_journal_unblock(struct journal *j)
848 {
849 spin_lock(&j->lock);
850 j->blocked--;
851 spin_unlock(&j->lock);
852
853 journal_wake(j);
854 }
855
bch2_journal_block(struct journal * j)856 void bch2_journal_block(struct journal *j)
857 {
858 spin_lock(&j->lock);
859 j->blocked++;
860 spin_unlock(&j->lock);
861
862 journal_quiesce(j);
863 }
864
__bch2_next_write_buffer_flush_journal_buf(struct journal * j,u64 max_seq)865 static struct journal_buf *__bch2_next_write_buffer_flush_journal_buf(struct journal *j, u64 max_seq)
866 {
867 struct journal_buf *ret = NULL;
868
869 /* We're inside wait_event(), but using mutex_lock(: */
870 sched_annotate_sleep();
871 mutex_lock(&j->buf_lock);
872 spin_lock(&j->lock);
873 max_seq = min(max_seq, journal_cur_seq(j));
874
875 for (u64 seq = journal_last_unwritten_seq(j);
876 seq <= max_seq;
877 seq++) {
878 unsigned idx = seq & JOURNAL_BUF_MASK;
879 struct journal_buf *buf = j->buf + idx;
880
881 if (buf->need_flush_to_write_buffer) {
882 if (seq == journal_cur_seq(j))
883 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true);
884
885 union journal_res_state s;
886 s.v = atomic64_read_acquire(&j->reservations.counter);
887
888 ret = journal_state_count(s, idx)
889 ? ERR_PTR(-EAGAIN)
890 : buf;
891 break;
892 }
893 }
894
895 spin_unlock(&j->lock);
896 if (IS_ERR_OR_NULL(ret))
897 mutex_unlock(&j->buf_lock);
898 return ret;
899 }
900
bch2_next_write_buffer_flush_journal_buf(struct journal * j,u64 max_seq)901 struct journal_buf *bch2_next_write_buffer_flush_journal_buf(struct journal *j, u64 max_seq)
902 {
903 struct journal_buf *ret;
904
905 wait_event(j->wait, (ret = __bch2_next_write_buffer_flush_journal_buf(j, max_seq)) != ERR_PTR(-EAGAIN));
906 return ret;
907 }
908
909 /* allocate journal on a device: */
910
__bch2_set_nr_journal_buckets(struct bch_dev * ca,unsigned nr,bool new_fs,struct closure * cl)911 static int __bch2_set_nr_journal_buckets(struct bch_dev *ca, unsigned nr,
912 bool new_fs, struct closure *cl)
913 {
914 struct bch_fs *c = ca->fs;
915 struct journal_device *ja = &ca->journal;
916 u64 *new_bucket_seq = NULL, *new_buckets = NULL;
917 struct open_bucket **ob = NULL;
918 long *bu = NULL;
919 unsigned i, pos, nr_got = 0, nr_want = nr - ja->nr;
920 int ret = 0;
921
922 BUG_ON(nr <= ja->nr);
923
924 bu = kcalloc(nr_want, sizeof(*bu), GFP_KERNEL);
925 ob = kcalloc(nr_want, sizeof(*ob), GFP_KERNEL);
926 new_buckets = kcalloc(nr, sizeof(u64), GFP_KERNEL);
927 new_bucket_seq = kcalloc(nr, sizeof(u64), GFP_KERNEL);
928 if (!bu || !ob || !new_buckets || !new_bucket_seq) {
929 ret = -BCH_ERR_ENOMEM_set_nr_journal_buckets;
930 goto err_free;
931 }
932
933 for (nr_got = 0; nr_got < nr_want; nr_got++) {
934 if (new_fs) {
935 bu[nr_got] = bch2_bucket_alloc_new_fs(ca);
936 if (bu[nr_got] < 0) {
937 ret = -BCH_ERR_ENOSPC_bucket_alloc;
938 break;
939 }
940 } else {
941 ob[nr_got] = bch2_bucket_alloc(c, ca, BCH_WATERMARK_normal,
942 BCH_DATA_journal, cl);
943 ret = PTR_ERR_OR_ZERO(ob[nr_got]);
944 if (ret)
945 break;
946
947 ret = bch2_trans_run(c,
948 bch2_trans_mark_metadata_bucket(trans, ca,
949 ob[nr_got]->bucket, BCH_DATA_journal,
950 ca->mi.bucket_size, BTREE_TRIGGER_transactional));
951 if (ret) {
952 bch2_open_bucket_put(c, ob[nr_got]);
953 bch_err_msg(c, ret, "marking new journal buckets");
954 break;
955 }
956
957 bu[nr_got] = ob[nr_got]->bucket;
958 }
959 }
960
961 if (!nr_got)
962 goto err_free;
963
964 /* Don't return an error if we successfully allocated some buckets: */
965 ret = 0;
966
967 if (c) {
968 bch2_journal_flush_all_pins(&c->journal);
969 bch2_journal_block(&c->journal);
970 mutex_lock(&c->sb_lock);
971 }
972
973 memcpy(new_buckets, ja->buckets, ja->nr * sizeof(u64));
974 memcpy(new_bucket_seq, ja->bucket_seq, ja->nr * sizeof(u64));
975
976 BUG_ON(ja->discard_idx > ja->nr);
977
978 pos = ja->discard_idx ?: ja->nr;
979
980 memmove(new_buckets + pos + nr_got,
981 new_buckets + pos,
982 sizeof(new_buckets[0]) * (ja->nr - pos));
983 memmove(new_bucket_seq + pos + nr_got,
984 new_bucket_seq + pos,
985 sizeof(new_bucket_seq[0]) * (ja->nr - pos));
986
987 for (i = 0; i < nr_got; i++) {
988 new_buckets[pos + i] = bu[i];
989 new_bucket_seq[pos + i] = 0;
990 }
991
992 nr = ja->nr + nr_got;
993
994 ret = bch2_journal_buckets_to_sb(c, ca, new_buckets, nr);
995 if (ret)
996 goto err_unblock;
997
998 if (!new_fs)
999 bch2_write_super(c);
1000
1001 /* Commit: */
1002 if (c)
1003 spin_lock(&c->journal.lock);
1004
1005 swap(new_buckets, ja->buckets);
1006 swap(new_bucket_seq, ja->bucket_seq);
1007 ja->nr = nr;
1008
1009 if (pos <= ja->discard_idx)
1010 ja->discard_idx = (ja->discard_idx + nr_got) % ja->nr;
1011 if (pos <= ja->dirty_idx_ondisk)
1012 ja->dirty_idx_ondisk = (ja->dirty_idx_ondisk + nr_got) % ja->nr;
1013 if (pos <= ja->dirty_idx)
1014 ja->dirty_idx = (ja->dirty_idx + nr_got) % ja->nr;
1015 if (pos <= ja->cur_idx)
1016 ja->cur_idx = (ja->cur_idx + nr_got) % ja->nr;
1017
1018 if (c)
1019 spin_unlock(&c->journal.lock);
1020 err_unblock:
1021 if (c) {
1022 bch2_journal_unblock(&c->journal);
1023 mutex_unlock(&c->sb_lock);
1024 }
1025
1026 if (ret && !new_fs)
1027 for (i = 0; i < nr_got; i++)
1028 bch2_trans_run(c,
1029 bch2_trans_mark_metadata_bucket(trans, ca,
1030 bu[i], BCH_DATA_free, 0,
1031 BTREE_TRIGGER_transactional));
1032 err_free:
1033 if (!new_fs)
1034 for (i = 0; i < nr_got; i++)
1035 bch2_open_bucket_put(c, ob[i]);
1036
1037 kfree(new_bucket_seq);
1038 kfree(new_buckets);
1039 kfree(ob);
1040 kfree(bu);
1041 return ret;
1042 }
1043
1044 /*
1045 * Allocate more journal space at runtime - not currently making use if it, but
1046 * the code works:
1047 */
bch2_set_nr_journal_buckets(struct bch_fs * c,struct bch_dev * ca,unsigned nr)1048 int bch2_set_nr_journal_buckets(struct bch_fs *c, struct bch_dev *ca,
1049 unsigned nr)
1050 {
1051 struct journal_device *ja = &ca->journal;
1052 struct closure cl;
1053 int ret = 0;
1054
1055 closure_init_stack(&cl);
1056
1057 down_write(&c->state_lock);
1058
1059 /* don't handle reducing nr of buckets yet: */
1060 if (nr < ja->nr)
1061 goto unlock;
1062
1063 while (ja->nr < nr) {
1064 struct disk_reservation disk_res = { 0, 0, 0 };
1065
1066 /*
1067 * note: journal buckets aren't really counted as _sectors_ used yet, so
1068 * we don't need the disk reservation to avoid the BUG_ON() in buckets.c
1069 * when space used goes up without a reservation - but we do need the
1070 * reservation to ensure we'll actually be able to allocate:
1071 *
1072 * XXX: that's not right, disk reservations only ensure a
1073 * filesystem-wide allocation will succeed, this is a device
1074 * specific allocation - we can hang here:
1075 */
1076
1077 ret = bch2_disk_reservation_get(c, &disk_res,
1078 bucket_to_sector(ca, nr - ja->nr), 1, 0);
1079 if (ret)
1080 break;
1081
1082 ret = __bch2_set_nr_journal_buckets(ca, nr, false, &cl);
1083
1084 bch2_disk_reservation_put(c, &disk_res);
1085
1086 closure_sync(&cl);
1087
1088 if (ret && ret != -BCH_ERR_bucket_alloc_blocked)
1089 break;
1090 }
1091
1092 bch_err_fn(c, ret);
1093 unlock:
1094 up_write(&c->state_lock);
1095 return ret;
1096 }
1097
bch2_dev_journal_alloc(struct bch_dev * ca)1098 int bch2_dev_journal_alloc(struct bch_dev *ca)
1099 {
1100 unsigned nr;
1101 int ret;
1102
1103 if (dynamic_fault("bcachefs:add:journal_alloc")) {
1104 ret = -BCH_ERR_ENOMEM_set_nr_journal_buckets;
1105 goto err;
1106 }
1107
1108 /* 1/128th of the device by default: */
1109 nr = ca->mi.nbuckets >> 7;
1110
1111 /*
1112 * clamp journal size to 8192 buckets or 8GB (in sectors), whichever
1113 * is smaller:
1114 */
1115 nr = clamp_t(unsigned, nr,
1116 BCH_JOURNAL_BUCKETS_MIN,
1117 min(1 << 13,
1118 (1 << 24) / ca->mi.bucket_size));
1119
1120 ret = __bch2_set_nr_journal_buckets(ca, nr, true, NULL);
1121 err:
1122 bch_err_fn(ca, ret);
1123 return ret;
1124 }
1125
bch2_fs_journal_alloc(struct bch_fs * c)1126 int bch2_fs_journal_alloc(struct bch_fs *c)
1127 {
1128 for_each_online_member(c, ca) {
1129 if (ca->journal.nr)
1130 continue;
1131
1132 int ret = bch2_dev_journal_alloc(ca);
1133 if (ret) {
1134 percpu_ref_put(&ca->io_ref);
1135 return ret;
1136 }
1137 }
1138
1139 return 0;
1140 }
1141
1142 /* startup/shutdown: */
1143
bch2_journal_writing_to_device(struct journal * j,unsigned dev_idx)1144 static bool bch2_journal_writing_to_device(struct journal *j, unsigned dev_idx)
1145 {
1146 bool ret = false;
1147 u64 seq;
1148
1149 spin_lock(&j->lock);
1150 for (seq = journal_last_unwritten_seq(j);
1151 seq <= journal_cur_seq(j) && !ret;
1152 seq++) {
1153 struct journal_buf *buf = journal_seq_to_buf(j, seq);
1154
1155 if (bch2_bkey_has_device_c(bkey_i_to_s_c(&buf->key), dev_idx))
1156 ret = true;
1157 }
1158 spin_unlock(&j->lock);
1159
1160 return ret;
1161 }
1162
bch2_dev_journal_stop(struct journal * j,struct bch_dev * ca)1163 void bch2_dev_journal_stop(struct journal *j, struct bch_dev *ca)
1164 {
1165 wait_event(j->wait, !bch2_journal_writing_to_device(j, ca->dev_idx));
1166 }
1167
bch2_fs_journal_stop(struct journal * j)1168 void bch2_fs_journal_stop(struct journal *j)
1169 {
1170 bch2_journal_reclaim_stop(j);
1171 bch2_journal_flush_all_pins(j);
1172
1173 wait_event(j->wait, bch2_journal_entry_close(j));
1174
1175 /*
1176 * Always write a new journal entry, to make sure the clock hands are up
1177 * to date (and match the superblock)
1178 */
1179 bch2_journal_meta(j);
1180
1181 journal_quiesce(j);
1182 cancel_delayed_work_sync(&j->write_work);
1183
1184 BUG_ON(!bch2_journal_error(j) &&
1185 test_bit(JOURNAL_replay_done, &j->flags) &&
1186 j->last_empty_seq != journal_cur_seq(j));
1187
1188 if (!bch2_journal_error(j))
1189 clear_bit(JOURNAL_running, &j->flags);
1190 }
1191
bch2_fs_journal_start(struct journal * j,u64 cur_seq)1192 int bch2_fs_journal_start(struct journal *j, u64 cur_seq)
1193 {
1194 struct bch_fs *c = container_of(j, struct bch_fs, journal);
1195 struct journal_entry_pin_list *p;
1196 struct journal_replay *i, **_i;
1197 struct genradix_iter iter;
1198 bool had_entries = false;
1199 u64 last_seq = cur_seq, nr, seq;
1200
1201 genradix_for_each_reverse(&c->journal_entries, iter, _i) {
1202 i = *_i;
1203
1204 if (journal_replay_ignore(i))
1205 continue;
1206
1207 last_seq = le64_to_cpu(i->j.last_seq);
1208 break;
1209 }
1210
1211 nr = cur_seq - last_seq;
1212
1213 if (nr + 1 > j->pin.size) {
1214 free_fifo(&j->pin);
1215 init_fifo(&j->pin, roundup_pow_of_two(nr + 1), GFP_KERNEL);
1216 if (!j->pin.data) {
1217 bch_err(c, "error reallocating journal fifo (%llu open entries)", nr);
1218 return -BCH_ERR_ENOMEM_journal_pin_fifo;
1219 }
1220 }
1221
1222 j->replay_journal_seq = last_seq;
1223 j->replay_journal_seq_end = cur_seq;
1224 j->last_seq_ondisk = last_seq;
1225 j->flushed_seq_ondisk = cur_seq - 1;
1226 j->seq_ondisk = cur_seq - 1;
1227 j->pin.front = last_seq;
1228 j->pin.back = cur_seq;
1229 atomic64_set(&j->seq, cur_seq - 1);
1230
1231 fifo_for_each_entry_ptr(p, &j->pin, seq)
1232 journal_pin_list_init(p, 1);
1233
1234 genradix_for_each(&c->journal_entries, iter, _i) {
1235 i = *_i;
1236
1237 if (journal_replay_ignore(i))
1238 continue;
1239
1240 seq = le64_to_cpu(i->j.seq);
1241 BUG_ON(seq >= cur_seq);
1242
1243 if (seq < last_seq)
1244 continue;
1245
1246 if (journal_entry_empty(&i->j))
1247 j->last_empty_seq = le64_to_cpu(i->j.seq);
1248
1249 p = journal_seq_pin(j, seq);
1250
1251 p->devs.nr = 0;
1252 darray_for_each(i->ptrs, ptr)
1253 bch2_dev_list_add_dev(&p->devs, ptr->dev);
1254
1255 had_entries = true;
1256 }
1257
1258 if (!had_entries)
1259 j->last_empty_seq = cur_seq;
1260
1261 spin_lock(&j->lock);
1262
1263 set_bit(JOURNAL_running, &j->flags);
1264 j->last_flush_write = jiffies;
1265
1266 j->reservations.idx = j->reservations.unwritten_idx = journal_cur_seq(j);
1267 j->reservations.unwritten_idx++;
1268
1269 c->last_bucket_seq_cleanup = journal_cur_seq(j);
1270
1271 bch2_journal_space_available(j);
1272 spin_unlock(&j->lock);
1273
1274 return bch2_journal_reclaim_start(j);
1275 }
1276
1277 /* init/exit: */
1278
bch2_dev_journal_exit(struct bch_dev * ca)1279 void bch2_dev_journal_exit(struct bch_dev *ca)
1280 {
1281 struct journal_device *ja = &ca->journal;
1282
1283 for (unsigned i = 0; i < ARRAY_SIZE(ja->bio); i++) {
1284 kfree(ja->bio[i]);
1285 ja->bio[i] = NULL;
1286 }
1287
1288 kfree(ja->buckets);
1289 kfree(ja->bucket_seq);
1290 ja->buckets = NULL;
1291 ja->bucket_seq = NULL;
1292 }
1293
bch2_dev_journal_init(struct bch_dev * ca,struct bch_sb * sb)1294 int bch2_dev_journal_init(struct bch_dev *ca, struct bch_sb *sb)
1295 {
1296 struct journal_device *ja = &ca->journal;
1297 struct bch_sb_field_journal *journal_buckets =
1298 bch2_sb_field_get(sb, journal);
1299 struct bch_sb_field_journal_v2 *journal_buckets_v2 =
1300 bch2_sb_field_get(sb, journal_v2);
1301
1302 ja->nr = 0;
1303
1304 if (journal_buckets_v2) {
1305 unsigned nr = bch2_sb_field_journal_v2_nr_entries(journal_buckets_v2);
1306
1307 for (unsigned i = 0; i < nr; i++)
1308 ja->nr += le64_to_cpu(journal_buckets_v2->d[i].nr);
1309 } else if (journal_buckets) {
1310 ja->nr = bch2_nr_journal_buckets(journal_buckets);
1311 }
1312
1313 ja->bucket_seq = kcalloc(ja->nr, sizeof(u64), GFP_KERNEL);
1314 if (!ja->bucket_seq)
1315 return -BCH_ERR_ENOMEM_dev_journal_init;
1316
1317 unsigned nr_bvecs = DIV_ROUND_UP(JOURNAL_ENTRY_SIZE_MAX, PAGE_SIZE);
1318
1319 for (unsigned i = 0; i < ARRAY_SIZE(ja->bio); i++) {
1320 ja->bio[i] = kmalloc(struct_size(ja->bio[i], bio.bi_inline_vecs,
1321 nr_bvecs), GFP_KERNEL);
1322 if (!ja->bio[i])
1323 return -BCH_ERR_ENOMEM_dev_journal_init;
1324
1325 ja->bio[i]->ca = ca;
1326 ja->bio[i]->buf_idx = i;
1327 bio_init(&ja->bio[i]->bio, NULL, ja->bio[i]->bio.bi_inline_vecs, nr_bvecs, 0);
1328 }
1329
1330 ja->buckets = kcalloc(ja->nr, sizeof(u64), GFP_KERNEL);
1331 if (!ja->buckets)
1332 return -BCH_ERR_ENOMEM_dev_journal_init;
1333
1334 if (journal_buckets_v2) {
1335 unsigned nr = bch2_sb_field_journal_v2_nr_entries(journal_buckets_v2);
1336 unsigned dst = 0;
1337
1338 for (unsigned i = 0; i < nr; i++)
1339 for (unsigned j = 0; j < le64_to_cpu(journal_buckets_v2->d[i].nr); j++)
1340 ja->buckets[dst++] =
1341 le64_to_cpu(journal_buckets_v2->d[i].start) + j;
1342 } else if (journal_buckets) {
1343 for (unsigned i = 0; i < ja->nr; i++)
1344 ja->buckets[i] = le64_to_cpu(journal_buckets->buckets[i]);
1345 }
1346
1347 return 0;
1348 }
1349
bch2_fs_journal_exit(struct journal * j)1350 void bch2_fs_journal_exit(struct journal *j)
1351 {
1352 if (j->wq)
1353 destroy_workqueue(j->wq);
1354
1355 darray_exit(&j->early_journal_entries);
1356
1357 for (unsigned i = 0; i < ARRAY_SIZE(j->buf); i++)
1358 kvfree(j->buf[i].data);
1359 free_fifo(&j->pin);
1360 }
1361
bch2_fs_journal_init(struct journal * j)1362 int bch2_fs_journal_init(struct journal *j)
1363 {
1364 static struct lock_class_key res_key;
1365
1366 mutex_init(&j->buf_lock);
1367 spin_lock_init(&j->lock);
1368 spin_lock_init(&j->err_lock);
1369 init_waitqueue_head(&j->wait);
1370 INIT_DELAYED_WORK(&j->write_work, journal_write_work);
1371 init_waitqueue_head(&j->reclaim_wait);
1372 init_waitqueue_head(&j->pin_flush_wait);
1373 mutex_init(&j->reclaim_lock);
1374 mutex_init(&j->discard_lock);
1375
1376 lockdep_init_map(&j->res_map, "journal res", &res_key, 0);
1377
1378 atomic64_set(&j->reservations.counter,
1379 ((union journal_res_state)
1380 { .cur_entry_offset = JOURNAL_ENTRY_CLOSED_VAL }).v);
1381
1382 if (!(init_fifo(&j->pin, JOURNAL_PIN, GFP_KERNEL)))
1383 return -BCH_ERR_ENOMEM_journal_pin_fifo;
1384
1385 for (unsigned i = 0; i < ARRAY_SIZE(j->buf); i++) {
1386 j->buf[i].buf_size = JOURNAL_ENTRY_SIZE_MIN;
1387 j->buf[i].data = kvmalloc(j->buf[i].buf_size, GFP_KERNEL);
1388 if (!j->buf[i].data)
1389 return -BCH_ERR_ENOMEM_journal_buf;
1390 j->buf[i].idx = i;
1391 }
1392
1393 j->pin.front = j->pin.back = 1;
1394
1395 j->wq = alloc_workqueue("bcachefs_journal",
1396 WQ_HIGHPRI|WQ_FREEZABLE|WQ_UNBOUND|WQ_MEM_RECLAIM, 512);
1397 if (!j->wq)
1398 return -BCH_ERR_ENOMEM_fs_other_alloc;
1399 return 0;
1400 }
1401
1402 /* debug: */
1403
1404 static const char * const bch2_journal_flags_strs[] = {
1405 #define x(n) #n,
1406 JOURNAL_FLAGS()
1407 #undef x
1408 NULL
1409 };
1410
__bch2_journal_debug_to_text(struct printbuf * out,struct journal * j)1411 void __bch2_journal_debug_to_text(struct printbuf *out, struct journal *j)
1412 {
1413 struct bch_fs *c = container_of(j, struct bch_fs, journal);
1414 union journal_res_state s;
1415 unsigned long now = jiffies;
1416 u64 nr_writes = j->nr_flush_writes + j->nr_noflush_writes;
1417
1418 if (!out->nr_tabstops)
1419 printbuf_tabstop_push(out, 28);
1420 out->atomic++;
1421
1422 rcu_read_lock();
1423 s = READ_ONCE(j->reservations);
1424
1425 prt_printf(out, "flags:\t");
1426 prt_bitflags(out, bch2_journal_flags_strs, j->flags);
1427 prt_newline(out);
1428 prt_printf(out, "dirty journal entries:\t%llu/%llu\n", fifo_used(&j->pin), j->pin.size);
1429 prt_printf(out, "seq:\t%llu\n", journal_cur_seq(j));
1430 prt_printf(out, "seq_ondisk:\t%llu\n", j->seq_ondisk);
1431 prt_printf(out, "last_seq:\t%llu\n", journal_last_seq(j));
1432 prt_printf(out, "last_seq_ondisk:\t%llu\n", j->last_seq_ondisk);
1433 prt_printf(out, "flushed_seq_ondisk:\t%llu\n", j->flushed_seq_ondisk);
1434 prt_printf(out, "watermark:\t%s\n", bch2_watermarks[j->watermark]);
1435 prt_printf(out, "each entry reserved:\t%u\n", j->entry_u64s_reserved);
1436 prt_printf(out, "nr flush writes:\t%llu\n", j->nr_flush_writes);
1437 prt_printf(out, "nr noflush writes:\t%llu\n", j->nr_noflush_writes);
1438 prt_printf(out, "average write size:\t");
1439 prt_human_readable_u64(out, nr_writes ? div64_u64(j->entry_bytes_written, nr_writes) : 0);
1440 prt_newline(out);
1441 prt_printf(out, "nr direct reclaim:\t%llu\n", j->nr_direct_reclaim);
1442 prt_printf(out, "nr background reclaim:\t%llu\n", j->nr_background_reclaim);
1443 prt_printf(out, "reclaim kicked:\t%u\n", j->reclaim_kicked);
1444 prt_printf(out, "reclaim runs in:\t%u ms\n", time_after(j->next_reclaim, now)
1445 ? jiffies_to_msecs(j->next_reclaim - jiffies) : 0);
1446 prt_printf(out, "blocked:\t%u\n", j->blocked);
1447 prt_printf(out, "current entry sectors:\t%u\n", j->cur_entry_sectors);
1448 prt_printf(out, "current entry error:\t%s\n", bch2_journal_errors[j->cur_entry_error]);
1449 prt_printf(out, "current entry:\t");
1450
1451 switch (s.cur_entry_offset) {
1452 case JOURNAL_ENTRY_ERROR_VAL:
1453 prt_printf(out, "error\n");
1454 break;
1455 case JOURNAL_ENTRY_CLOSED_VAL:
1456 prt_printf(out, "closed\n");
1457 break;
1458 default:
1459 prt_printf(out, "%u/%u\n", s.cur_entry_offset, j->cur_entry_u64s);
1460 break;
1461 }
1462
1463 prt_printf(out, "unwritten entries:\n");
1464 bch2_journal_bufs_to_text(out, j);
1465
1466 prt_printf(out, "space:\n");
1467 printbuf_indent_add(out, 2);
1468 prt_printf(out, "discarded\t%u:%u\n",
1469 j->space[journal_space_discarded].next_entry,
1470 j->space[journal_space_discarded].total);
1471 prt_printf(out, "clean ondisk\t%u:%u\n",
1472 j->space[journal_space_clean_ondisk].next_entry,
1473 j->space[journal_space_clean_ondisk].total);
1474 prt_printf(out, "clean\t%u:%u\n",
1475 j->space[journal_space_clean].next_entry,
1476 j->space[journal_space_clean].total);
1477 prt_printf(out, "total\t%u:%u\n",
1478 j->space[journal_space_total].next_entry,
1479 j->space[journal_space_total].total);
1480 printbuf_indent_sub(out, 2);
1481
1482 for_each_member_device_rcu(c, ca, &c->rw_devs[BCH_DATA_journal]) {
1483 struct journal_device *ja = &ca->journal;
1484
1485 if (!test_bit(ca->dev_idx, c->rw_devs[BCH_DATA_journal].d))
1486 continue;
1487
1488 if (!ja->nr)
1489 continue;
1490
1491 prt_printf(out, "dev %u:\n", ca->dev_idx);
1492 printbuf_indent_add(out, 2);
1493 prt_printf(out, "nr\t%u\n", ja->nr);
1494 prt_printf(out, "bucket size\t%u\n", ca->mi.bucket_size);
1495 prt_printf(out, "available\t%u:%u\n", bch2_journal_dev_buckets_available(j, ja, journal_space_discarded), ja->sectors_free);
1496 prt_printf(out, "discard_idx\t%u\n", ja->discard_idx);
1497 prt_printf(out, "dirty_ondisk\t%u (seq %llu)\n",ja->dirty_idx_ondisk, ja->bucket_seq[ja->dirty_idx_ondisk]);
1498 prt_printf(out, "dirty_idx\t%u (seq %llu)\n", ja->dirty_idx, ja->bucket_seq[ja->dirty_idx]);
1499 prt_printf(out, "cur_idx\t%u (seq %llu)\n", ja->cur_idx, ja->bucket_seq[ja->cur_idx]);
1500 printbuf_indent_sub(out, 2);
1501 }
1502
1503 rcu_read_unlock();
1504
1505 --out->atomic;
1506 }
1507
bch2_journal_debug_to_text(struct printbuf * out,struct journal * j)1508 void bch2_journal_debug_to_text(struct printbuf *out, struct journal *j)
1509 {
1510 spin_lock(&j->lock);
1511 __bch2_journal_debug_to_text(out, j);
1512 spin_unlock(&j->lock);
1513 }
1514
bch2_journal_seq_pins_to_text(struct printbuf * out,struct journal * j,u64 * seq)1515 bool bch2_journal_seq_pins_to_text(struct printbuf *out, struct journal *j, u64 *seq)
1516 {
1517 struct journal_entry_pin_list *pin_list;
1518 struct journal_entry_pin *pin;
1519
1520 spin_lock(&j->lock);
1521 *seq = max(*seq, j->pin.front);
1522
1523 if (*seq >= j->pin.back) {
1524 spin_unlock(&j->lock);
1525 return true;
1526 }
1527
1528 out->atomic++;
1529
1530 pin_list = journal_seq_pin(j, *seq);
1531
1532 prt_printf(out, "%llu: count %u\n", *seq, atomic_read(&pin_list->count));
1533 printbuf_indent_add(out, 2);
1534
1535 for (unsigned i = 0; i < ARRAY_SIZE(pin_list->list); i++)
1536 list_for_each_entry(pin, &pin_list->list[i], list)
1537 prt_printf(out, "\t%px %ps\n", pin, pin->flush);
1538
1539 if (!list_empty(&pin_list->flushed))
1540 prt_printf(out, "flushed:\n");
1541
1542 list_for_each_entry(pin, &pin_list->flushed, list)
1543 prt_printf(out, "\t%px %ps\n", pin, pin->flush);
1544
1545 printbuf_indent_sub(out, 2);
1546
1547 --out->atomic;
1548 spin_unlock(&j->lock);
1549
1550 return false;
1551 }
1552
bch2_journal_pins_to_text(struct printbuf * out,struct journal * j)1553 void bch2_journal_pins_to_text(struct printbuf *out, struct journal *j)
1554 {
1555 u64 seq = 0;
1556
1557 while (!bch2_journal_seq_pins_to_text(out, j, &seq))
1558 seq++;
1559 }
1560