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