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