git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/journal.c

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