1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * bcachefs journalling code, for btree insertions 4 * 5 * Copyright 2012 Google, Inc. 6 */ 7 8 #include "bcachefs.h" 9 #include "alloc_foreground.h" 10 #include "bkey_methods.h" 11 #include "btree_gc.h" 12 #include "btree_update.h" 13 #include "btree_write_buffer.h" 14 #include "buckets.h" 15 #include "error.h" 16 #include "journal.h" 17 #include "journal_io.h" 18 #include "journal_reclaim.h" 19 #include "journal_sb.h" 20 #include "journal_seq_blacklist.h" 21 #include "trace.h" 22 23 static const char * const bch2_journal_errors[] = { 24 #define x(n) #n, 25 JOURNAL_ERRORS() 26 #undef x 27 NULL 28 }; 29 30 static inline bool journal_seq_unwritten(struct journal *j, u64 seq) 31 { 32 return seq > j->seq_ondisk; 33 } 34 35 static bool __journal_entry_is_open(union journal_res_state state) 36 { 37 return state.cur_entry_offset < JOURNAL_ENTRY_CLOSED_VAL; 38 } 39 40 static inline unsigned nr_unwritten_journal_entries(struct journal *j) 41 { 42 return atomic64_read(&j->seq) - j->seq_ondisk; 43 } 44 45 static bool journal_entry_is_open(struct journal *j) 46 { 47 return __journal_entry_is_open(j->reservations); 48 } 49 50 static void bch2_journal_buf_to_text(struct printbuf *out, struct journal *j, u64 seq) 51 { 52 union journal_res_state s = READ_ONCE(j->reservations); 53 unsigned i = seq & JOURNAL_BUF_MASK; 54 struct journal_buf *buf = j->buf + i; 55 56 prt_printf(out, "seq:\t%llu\n", seq); 57 printbuf_indent_add(out, 2); 58 59 prt_printf(out, "refcount:\t%u\n", journal_state_count(s, i)); 60 61 prt_printf(out, "size:\t"); 62 prt_human_readable_u64(out, vstruct_bytes(buf->data)); 63 prt_newline(out); 64 65 prt_printf(out, "expires:\t"); 66 prt_printf(out, "%li jiffies\n", buf->expires - jiffies); 67 68 prt_printf(out, "flags:\t"); 69 if (buf->noflush) 70 prt_str(out, "noflush "); 71 if (buf->must_flush) 72 prt_str(out, "must_flush "); 73 if (buf->separate_flush) 74 prt_str(out, "separate_flush "); 75 if (buf->need_flush_to_write_buffer) 76 prt_str(out, "need_flush_to_write_buffer "); 77 if (buf->write_started) 78 prt_str(out, "write_started "); 79 if (buf->write_allocated) 80 prt_str(out, "write_allocated "); 81 if (buf->write_done) 82 prt_str(out, "write_done"); 83 prt_newline(out); 84 85 printbuf_indent_sub(out, 2); 86 } 87 88 static void bch2_journal_bufs_to_text(struct printbuf *out, struct journal *j) 89 { 90 if (!out->nr_tabstops) 91 printbuf_tabstop_push(out, 24); 92 93 for (u64 seq = journal_last_unwritten_seq(j); 94 seq <= journal_cur_seq(j); 95 seq++) 96 bch2_journal_buf_to_text(out, j, seq); 97 prt_printf(out, "last buf %s\n", journal_entry_is_open(j) ? "open" : "closed"); 98 } 99 100 static inline struct journal_buf * 101 journal_seq_to_buf(struct journal *j, u64 seq) 102 { 103 struct journal_buf *buf = NULL; 104 105 EBUG_ON(seq > journal_cur_seq(j)); 106 107 if (journal_seq_unwritten(j, seq)) { 108 buf = j->buf + (seq & JOURNAL_BUF_MASK); 109 EBUG_ON(le64_to_cpu(buf->data->seq) != seq); 110 } 111 return buf; 112 } 113 114 static void journal_pin_list_init(struct journal_entry_pin_list *p, int count) 115 { 116 for (unsigned i = 0; i < ARRAY_SIZE(p->unflushed); i++) 117 INIT_LIST_HEAD(&p->unflushed[i]); 118 for (unsigned i = 0; i < ARRAY_SIZE(p->flushed); i++) 119 INIT_LIST_HEAD(&p->flushed[i]); 120 atomic_set(&p->count, count); 121 p->devs.nr = 0; 122 } 123 124 /* 125 * Detect stuck journal conditions and trigger shutdown. Technically the journal 126 * can end up stuck for a variety of reasons, such as a blocked I/O, journal 127 * reservation lockup, etc. Since this is a fatal error with potentially 128 * unpredictable characteristics, we want to be fairly conservative before we 129 * decide to shut things down. 130 * 131 * Consider the journal stuck when it appears full with no ability to commit 132 * btree transactions, to discard journal buckets, nor acquire priority 133 * (reserved watermark) reservation. 134 */ 135 static inline bool 136 journal_error_check_stuck(struct journal *j, int error, unsigned flags) 137 { 138 struct bch_fs *c = container_of(j, struct bch_fs, journal); 139 bool stuck = false; 140 struct printbuf buf = PRINTBUF; 141 142 if (!(error == JOURNAL_ERR_journal_full || 143 error == JOURNAL_ERR_journal_pin_full) || 144 nr_unwritten_journal_entries(j) || 145 (flags & BCH_WATERMARK_MASK) != BCH_WATERMARK_reclaim) 146 return stuck; 147 148 spin_lock(&j->lock); 149 150 if (j->can_discard) { 151 spin_unlock(&j->lock); 152 return stuck; 153 } 154 155 stuck = true; 156 157 /* 158 * The journal shutdown path will set ->err_seq, but do it here first to 159 * serialize against concurrent failures and avoid duplicate error 160 * reports. 161 */ 162 if (j->err_seq) { 163 spin_unlock(&j->lock); 164 return stuck; 165 } 166 j->err_seq = journal_cur_seq(j); 167 spin_unlock(&j->lock); 168 169 bch_err(c, "Journal stuck! Hava a pre-reservation but journal full (error %s)", 170 bch2_journal_errors[error]); 171 bch2_journal_debug_to_text(&buf, j); 172 bch_err(c, "%s", buf.buf); 173 174 printbuf_reset(&buf); 175 bch2_journal_pins_to_text(&buf, j); 176 bch_err(c, "Journal pins:\n%s", buf.buf); 177 printbuf_exit(&buf); 178 179 bch2_fatal_error(c); 180 dump_stack(); 181 182 return stuck; 183 } 184 185 void bch2_journal_do_writes(struct journal *j) 186 { 187 for (u64 seq = journal_last_unwritten_seq(j); 188 seq <= journal_cur_seq(j); 189 seq++) { 190 unsigned idx = seq & JOURNAL_BUF_MASK; 191 struct journal_buf *w = j->buf + idx; 192 193 if (w->write_started && !w->write_allocated) 194 break; 195 if (w->write_started) 196 continue; 197 198 if (!journal_state_count(j->reservations, idx)) { 199 w->write_started = true; 200 closure_call(&w->io, bch2_journal_write, j->wq, NULL); 201 } 202 203 break; 204 } 205 } 206 207 /* 208 * Final processing when the last reference of a journal buffer has been 209 * dropped. Drop the pin list reference acquired at journal entry open and write 210 * the buffer, if requested. 211 */ 212 void bch2_journal_buf_put_final(struct journal *j, u64 seq) 213 { 214 lockdep_assert_held(&j->lock); 215 216 if (__bch2_journal_pin_put(j, seq)) 217 bch2_journal_reclaim_fast(j); 218 bch2_journal_do_writes(j); 219 220 /* 221 * for __bch2_next_write_buffer_flush_journal_buf(), when quiescing an 222 * open journal entry 223 */ 224 wake_up(&j->wait); 225 } 226 227 /* 228 * Returns true if journal entry is now closed: 229 * 230 * We don't close a journal_buf until the next journal_buf is finished writing, 231 * and can be opened again - this also initializes the next journal_buf: 232 */ 233 static void __journal_entry_close(struct journal *j, unsigned closed_val, bool trace) 234 { 235 struct bch_fs *c = container_of(j, struct bch_fs, journal); 236 struct journal_buf *buf = journal_cur_buf(j); 237 union journal_res_state old, new; 238 unsigned sectors; 239 240 BUG_ON(closed_val != JOURNAL_ENTRY_CLOSED_VAL && 241 closed_val != JOURNAL_ENTRY_ERROR_VAL); 242 243 lockdep_assert_held(&j->lock); 244 245 old.v = atomic64_read(&j->reservations.counter); 246 do { 247 new.v = old.v; 248 new.cur_entry_offset = closed_val; 249 250 if (old.cur_entry_offset == JOURNAL_ENTRY_ERROR_VAL || 251 old.cur_entry_offset == new.cur_entry_offset) 252 return; 253 } while (!atomic64_try_cmpxchg(&j->reservations.counter, 254 &old.v, new.v)); 255 256 if (!__journal_entry_is_open(old)) 257 return; 258 259 if (old.cur_entry_offset == JOURNAL_ENTRY_BLOCKED_VAL) 260 old.cur_entry_offset = j->cur_entry_offset_if_blocked; 261 262 /* Close out old buffer: */ 263 buf->data->u64s = cpu_to_le32(old.cur_entry_offset); 264 265 if (trace_journal_entry_close_enabled() && trace) { 266 struct printbuf pbuf = PRINTBUF; 267 pbuf.atomic++; 268 269 prt_str(&pbuf, "entry size: "); 270 prt_human_readable_u64(&pbuf, vstruct_bytes(buf->data)); 271 prt_newline(&pbuf); 272 bch2_prt_task_backtrace(&pbuf, current, 1, GFP_NOWAIT); 273 trace_journal_entry_close(c, pbuf.buf); 274 printbuf_exit(&pbuf); 275 } 276 277 sectors = vstruct_blocks_plus(buf->data, c->block_bits, 278 buf->u64s_reserved) << c->block_bits; 279 BUG_ON(sectors > buf->sectors); 280 buf->sectors = sectors; 281 282 /* 283 * We have to set last_seq here, _before_ opening a new journal entry: 284 * 285 * A threads may replace an old pin with a new pin on their current 286 * journal reservation - the expectation being that the journal will 287 * contain either what the old pin protected or what the new pin 288 * protects. 289 * 290 * After the old pin is dropped journal_last_seq() won't include the old 291 * pin, so we can only write the updated last_seq on the entry that 292 * contains whatever the new pin protects. 293 * 294 * Restated, we can _not_ update last_seq for a given entry if there 295 * could be a newer entry open with reservations/pins that have been 296 * taken against it. 297 * 298 * Hence, we want update/set last_seq on the current journal entry right 299 * before we open a new one: 300 */ 301 buf->last_seq = journal_last_seq(j); 302 buf->data->last_seq = cpu_to_le64(buf->last_seq); 303 BUG_ON(buf->last_seq > le64_to_cpu(buf->data->seq)); 304 305 cancel_delayed_work(&j->write_work); 306 307 bch2_journal_space_available(j); 308 309 __bch2_journal_buf_put(j, old.idx, le64_to_cpu(buf->data->seq)); 310 } 311 312 void bch2_journal_halt(struct journal *j) 313 { 314 spin_lock(&j->lock); 315 __journal_entry_close(j, JOURNAL_ENTRY_ERROR_VAL, true); 316 if (!j->err_seq) 317 j->err_seq = journal_cur_seq(j); 318 journal_wake(j); 319 spin_unlock(&j->lock); 320 } 321 322 void bch2_journal_halt_locked(struct journal *j) 323 { 324 lockdep_assert_held(&j->lock); 325 326 __journal_entry_close(j, JOURNAL_ENTRY_ERROR_VAL, true); 327 if (!j->err_seq) 328 j->err_seq = journal_cur_seq(j); 329 journal_wake(j); 330 } 331 332 static bool journal_entry_want_write(struct journal *j) 333 { 334 bool ret = !journal_entry_is_open(j) || 335 journal_cur_seq(j) == journal_last_unwritten_seq(j); 336 337 /* Don't close it yet if we already have a write in flight: */ 338 if (ret) 339 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true); 340 else if (nr_unwritten_journal_entries(j)) { 341 struct journal_buf *buf = journal_cur_buf(j); 342 343 if (!buf->flush_time) { 344 buf->flush_time = local_clock() ?: 1; 345 buf->expires = jiffies; 346 } 347 } 348 349 return ret; 350 } 351 352 bool bch2_journal_entry_close(struct journal *j) 353 { 354 bool ret; 355 356 spin_lock(&j->lock); 357 ret = journal_entry_want_write(j); 358 spin_unlock(&j->lock); 359 360 return ret; 361 } 362 363 /* 364 * should _only_ called from journal_res_get() - when we actually want a 365 * journal reservation - journal entry is open means journal is dirty: 366 */ 367 static int journal_entry_open(struct journal *j) 368 { 369 struct bch_fs *c = container_of(j, struct bch_fs, journal); 370 struct journal_buf *buf = j->buf + 371 ((journal_cur_seq(j) + 1) & JOURNAL_BUF_MASK); 372 union journal_res_state old, new; 373 int u64s; 374 375 lockdep_assert_held(&j->lock); 376 BUG_ON(journal_entry_is_open(j)); 377 BUG_ON(BCH_SB_CLEAN(c->disk_sb.sb)); 378 379 if (j->blocked) 380 return JOURNAL_ERR_blocked; 381 382 if (j->cur_entry_error) 383 return j->cur_entry_error; 384 385 if (bch2_journal_error(j)) 386 return JOURNAL_ERR_insufficient_devices; /* -EROFS */ 387 388 if (!fifo_free(&j->pin)) 389 return JOURNAL_ERR_journal_pin_full; 390 391 if (nr_unwritten_journal_entries(j) == ARRAY_SIZE(j->buf)) 392 return JOURNAL_ERR_max_in_flight; 393 394 if (journal_cur_seq(j) >= JOURNAL_SEQ_MAX) { 395 bch_err(c, "cannot start: journal seq overflow"); 396 if (bch2_fs_emergency_read_only_locked(c)) 397 bch_err(c, "fatal error - emergency read only"); 398 return JOURNAL_ERR_insufficient_devices; /* -EROFS */ 399 } 400 401 BUG_ON(!j->cur_entry_sectors); 402 403 buf->expires = 404 (journal_cur_seq(j) == j->flushed_seq_ondisk 405 ? jiffies 406 : j->last_flush_write) + 407 msecs_to_jiffies(c->opts.journal_flush_delay); 408 409 buf->u64s_reserved = j->entry_u64s_reserved; 410 buf->disk_sectors = j->cur_entry_sectors; 411 buf->sectors = min(buf->disk_sectors, buf->buf_size >> 9); 412 413 u64s = (int) (buf->sectors << 9) / sizeof(u64) - 414 journal_entry_overhead(j); 415 u64s = clamp_t(int, u64s, 0, JOURNAL_ENTRY_CLOSED_VAL - 1); 416 417 if (u64s <= (ssize_t) j->early_journal_entries.nr) 418 return JOURNAL_ERR_journal_full; 419 420 if (fifo_empty(&j->pin) && j->reclaim_thread) 421 wake_up_process(j->reclaim_thread); 422 423 /* 424 * The fifo_push() needs to happen at the same time as j->seq is 425 * incremented for journal_last_seq() to be calculated correctly 426 */ 427 atomic64_inc(&j->seq); 428 journal_pin_list_init(fifo_push_ref(&j->pin), 1); 429 430 BUG_ON(j->pin.back - 1 != atomic64_read(&j->seq)); 431 432 BUG_ON(j->buf + (journal_cur_seq(j) & JOURNAL_BUF_MASK) != buf); 433 434 bkey_extent_init(&buf->key); 435 buf->noflush = false; 436 buf->must_flush = false; 437 buf->separate_flush = false; 438 buf->flush_time = 0; 439 buf->need_flush_to_write_buffer = true; 440 buf->write_started = false; 441 buf->write_allocated = false; 442 buf->write_done = false; 443 444 memset(buf->data, 0, sizeof(*buf->data)); 445 buf->data->seq = cpu_to_le64(journal_cur_seq(j)); 446 buf->data->u64s = 0; 447 448 if (j->early_journal_entries.nr) { 449 memcpy(buf->data->_data, j->early_journal_entries.data, 450 j->early_journal_entries.nr * sizeof(u64)); 451 le32_add_cpu(&buf->data->u64s, j->early_journal_entries.nr); 452 } 453 454 /* 455 * Must be set before marking the journal entry as open: 456 */ 457 j->cur_entry_u64s = u64s; 458 459 old.v = atomic64_read(&j->reservations.counter); 460 do { 461 new.v = old.v; 462 463 BUG_ON(old.cur_entry_offset == JOURNAL_ENTRY_ERROR_VAL); 464 465 new.idx++; 466 BUG_ON(journal_state_count(new, new.idx)); 467 BUG_ON(new.idx != (journal_cur_seq(j) & JOURNAL_BUF_MASK)); 468 469 journal_state_inc(&new); 470 471 /* Handle any already added entries */ 472 new.cur_entry_offset = le32_to_cpu(buf->data->u64s); 473 } while (!atomic64_try_cmpxchg(&j->reservations.counter, 474 &old.v, new.v)); 475 476 if (nr_unwritten_journal_entries(j) == 1) 477 mod_delayed_work(j->wq, 478 &j->write_work, 479 msecs_to_jiffies(c->opts.journal_flush_delay)); 480 journal_wake(j); 481 482 if (j->early_journal_entries.nr) 483 darray_exit(&j->early_journal_entries); 484 return 0; 485 } 486 487 static bool journal_quiesced(struct journal *j) 488 { 489 bool ret = atomic64_read(&j->seq) == j->seq_ondisk; 490 491 if (!ret) 492 bch2_journal_entry_close(j); 493 return ret; 494 } 495 496 static void journal_quiesce(struct journal *j) 497 { 498 wait_event(j->wait, journal_quiesced(j)); 499 } 500 501 static void journal_write_work(struct work_struct *work) 502 { 503 struct journal *j = container_of(work, struct journal, write_work.work); 504 505 spin_lock(&j->lock); 506 if (__journal_entry_is_open(j->reservations)) { 507 long delta = journal_cur_buf(j)->expires - jiffies; 508 509 if (delta > 0) 510 mod_delayed_work(j->wq, &j->write_work, delta); 511 else 512 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true); 513 } 514 spin_unlock(&j->lock); 515 } 516 517 static int __journal_res_get(struct journal *j, struct journal_res *res, 518 unsigned flags) 519 { 520 struct bch_fs *c = container_of(j, struct bch_fs, journal); 521 struct journal_buf *buf; 522 bool can_discard; 523 int ret; 524 retry: 525 if (journal_res_get_fast(j, res, flags)) 526 return 0; 527 528 if (bch2_journal_error(j)) 529 return -BCH_ERR_erofs_journal_err; 530 531 if (j->blocked) 532 return -BCH_ERR_journal_res_get_blocked; 533 534 if ((flags & BCH_WATERMARK_MASK) < j->watermark) { 535 ret = JOURNAL_ERR_journal_full; 536 can_discard = j->can_discard; 537 goto out; 538 } 539 540 if (nr_unwritten_journal_entries(j) == ARRAY_SIZE(j->buf) && !journal_entry_is_open(j)) { 541 ret = JOURNAL_ERR_max_in_flight; 542 goto out; 543 } 544 545 spin_lock(&j->lock); 546 547 /* 548 * Recheck after taking the lock, so we don't race with another thread 549 * that just did journal_entry_open() and call bch2_journal_entry_close() 550 * unnecessarily 551 */ 552 if (journal_res_get_fast(j, res, flags)) { 553 ret = 0; 554 goto unlock; 555 } 556 557 /* 558 * If we couldn't get a reservation because the current buf filled up, 559 * and we had room for a bigger entry on disk, signal that we want to 560 * realloc the journal bufs: 561 */ 562 buf = journal_cur_buf(j); 563 if (journal_entry_is_open(j) && 564 buf->buf_size >> 9 < buf->disk_sectors && 565 buf->buf_size < JOURNAL_ENTRY_SIZE_MAX) 566 j->buf_size_want = max(j->buf_size_want, buf->buf_size << 1); 567 568 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, false); 569 ret = journal_entry_open(j) ?: JOURNAL_ERR_retry; 570 unlock: 571 can_discard = j->can_discard; 572 spin_unlock(&j->lock); 573 out: 574 if (ret == JOURNAL_ERR_retry) 575 goto retry; 576 if (!ret) 577 return 0; 578 579 if (journal_error_check_stuck(j, ret, flags)) 580 ret = -BCH_ERR_journal_res_get_blocked; 581 582 if (ret == JOURNAL_ERR_max_in_flight && 583 track_event_change(&c->times[BCH_TIME_blocked_journal_max_in_flight], true)) { 584 585 struct printbuf buf = PRINTBUF; 586 prt_printf(&buf, "seq %llu\n", journal_cur_seq(j)); 587 bch2_journal_bufs_to_text(&buf, j); 588 trace_journal_entry_full(c, buf.buf); 589 printbuf_exit(&buf); 590 count_event(c, journal_entry_full); 591 } 592 593 /* 594 * Journal is full - can't rely on reclaim from work item due to 595 * freezing: 596 */ 597 if ((ret == JOURNAL_ERR_journal_full || 598 ret == JOURNAL_ERR_journal_pin_full) && 599 !(flags & JOURNAL_RES_GET_NONBLOCK)) { 600 if (can_discard) { 601 bch2_journal_do_discards(j); 602 goto retry; 603 } 604 605 if (mutex_trylock(&j->reclaim_lock)) { 606 bch2_journal_reclaim(j); 607 mutex_unlock(&j->reclaim_lock); 608 } 609 } 610 611 return ret == JOURNAL_ERR_insufficient_devices 612 ? -BCH_ERR_erofs_journal_err 613 : -BCH_ERR_journal_res_get_blocked; 614 } 615 616 static unsigned max_dev_latency(struct bch_fs *c) 617 { 618 u64 nsecs = 0; 619 620 for_each_rw_member(c, ca) 621 nsecs = max(nsecs, ca->io_latency[WRITE].stats.max_duration); 622 623 return nsecs_to_jiffies(nsecs); 624 } 625 626 /* 627 * Essentially the entry function to the journaling code. When bcachefs is doing 628 * a btree insert, it calls this function to get the current journal write. 629 * Journal write is the structure used set up journal writes. The calling 630 * function will then add its keys to the structure, queuing them for the next 631 * write. 632 * 633 * To ensure forward progress, the current task must not be holding any 634 * btree node write locks. 635 */ 636 int bch2_journal_res_get_slowpath(struct journal *j, struct journal_res *res, 637 unsigned flags, 638 struct btree_trans *trans) 639 { 640 int ret; 641 642 if (closure_wait_event_timeout(&j->async_wait, 643 (ret = __journal_res_get(j, res, flags)) != -BCH_ERR_journal_res_get_blocked || 644 (flags & JOURNAL_RES_GET_NONBLOCK), 645 HZ)) 646 return ret; 647 648 if (trans) 649 bch2_trans_unlock_long(trans); 650 651 struct bch_fs *c = container_of(j, struct bch_fs, journal); 652 int remaining_wait = max(max_dev_latency(c) * 2, HZ * 10); 653 654 remaining_wait = max(0, remaining_wait - HZ); 655 656 if (closure_wait_event_timeout(&j->async_wait, 657 (ret = __journal_res_get(j, res, flags)) != -BCH_ERR_journal_res_get_blocked || 658 (flags & JOURNAL_RES_GET_NONBLOCK), 659 remaining_wait)) 660 return ret; 661 662 struct printbuf buf = PRINTBUF; 663 bch2_journal_debug_to_text(&buf, j); 664 bch_err(c, "Journal stuck? Waited for 10 seconds...\n%s", 665 buf.buf); 666 printbuf_exit(&buf); 667 668 closure_wait_event(&j->async_wait, 669 (ret = __journal_res_get(j, res, flags)) != -BCH_ERR_journal_res_get_blocked || 670 (flags & JOURNAL_RES_GET_NONBLOCK)); 671 return ret; 672 } 673 674 /* journal_entry_res: */ 675 676 void bch2_journal_entry_res_resize(struct journal *j, 677 struct journal_entry_res *res, 678 unsigned new_u64s) 679 { 680 union journal_res_state state; 681 int d = new_u64s - res->u64s; 682 683 spin_lock(&j->lock); 684 685 j->entry_u64s_reserved += d; 686 if (d <= 0) 687 goto out; 688 689 j->cur_entry_u64s = max_t(int, 0, j->cur_entry_u64s - d); 690 smp_mb(); 691 state = READ_ONCE(j->reservations); 692 693 if (state.cur_entry_offset < JOURNAL_ENTRY_CLOSED_VAL && 694 state.cur_entry_offset > j->cur_entry_u64s) { 695 j->cur_entry_u64s += d; 696 /* 697 * Not enough room in current journal entry, have to flush it: 698 */ 699 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true); 700 } else { 701 journal_cur_buf(j)->u64s_reserved += d; 702 } 703 out: 704 spin_unlock(&j->lock); 705 res->u64s += d; 706 } 707 708 /* journal flushing: */ 709 710 /** 711 * bch2_journal_flush_seq_async - wait for a journal entry to be written 712 * @j: journal object 713 * @seq: seq to flush 714 * @parent: closure object to wait with 715 * Returns: 1 if @seq has already been flushed, 0 if @seq is being flushed, 716 * -BCH_ERR_journal_flush_err if @seq will never be flushed 717 * 718 * Like bch2_journal_wait_on_seq, except that it triggers a write immediately if 719 * necessary 720 */ 721 int bch2_journal_flush_seq_async(struct journal *j, u64 seq, 722 struct closure *parent) 723 { 724 struct journal_buf *buf; 725 int ret = 0; 726 727 if (seq <= j->flushed_seq_ondisk) 728 return 1; 729 730 spin_lock(&j->lock); 731 732 if (WARN_ONCE(seq > journal_cur_seq(j), 733 "requested to flush journal seq %llu, but currently at %llu", 734 seq, journal_cur_seq(j))) 735 goto out; 736 737 /* Recheck under lock: */ 738 if (j->err_seq && seq >= j->err_seq) { 739 ret = -BCH_ERR_journal_flush_err; 740 goto out; 741 } 742 743 if (seq <= j->flushed_seq_ondisk) { 744 ret = 1; 745 goto out; 746 } 747 748 /* if seq was written, but not flushed - flush a newer one instead */ 749 seq = max(seq, journal_last_unwritten_seq(j)); 750 751 recheck_need_open: 752 if (seq > journal_cur_seq(j)) { 753 struct journal_res res = { 0 }; 754 755 if (journal_entry_is_open(j)) 756 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true); 757 758 spin_unlock(&j->lock); 759 760 /* 761 * We're called from bch2_journal_flush_seq() -> wait_event(); 762 * but this might block. We won't usually block, so we won't 763 * livelock: 764 */ 765 sched_annotate_sleep(); 766 ret = bch2_journal_res_get(j, &res, jset_u64s(0), 0, NULL); 767 if (ret) 768 return ret; 769 770 seq = res.seq; 771 buf = journal_seq_to_buf(j, seq); 772 buf->must_flush = true; 773 774 if (!buf->flush_time) { 775 buf->flush_time = local_clock() ?: 1; 776 buf->expires = jiffies; 777 } 778 779 if (parent && !closure_wait(&buf->wait, parent)) 780 BUG(); 781 782 bch2_journal_res_put(j, &res); 783 784 spin_lock(&j->lock); 785 goto want_write; 786 } 787 788 /* 789 * if write was kicked off without a flush, or if we promised it 790 * wouldn't be a flush, flush the next sequence number instead 791 */ 792 buf = journal_seq_to_buf(j, seq); 793 if (buf->noflush) { 794 seq++; 795 goto recheck_need_open; 796 } 797 798 buf->must_flush = true; 799 j->flushing_seq = max(j->flushing_seq, seq); 800 801 if (parent && !closure_wait(&buf->wait, parent)) 802 BUG(); 803 want_write: 804 if (seq == journal_cur_seq(j)) 805 journal_entry_want_write(j); 806 out: 807 spin_unlock(&j->lock); 808 return ret; 809 } 810 811 int bch2_journal_flush_seq(struct journal *j, u64 seq, unsigned task_state) 812 { 813 u64 start_time = local_clock(); 814 int ret, ret2; 815 816 /* 817 * Don't update time_stats when @seq is already flushed: 818 */ 819 if (seq <= j->flushed_seq_ondisk) 820 return 0; 821 822 ret = wait_event_state(j->wait, 823 (ret2 = bch2_journal_flush_seq_async(j, seq, NULL)), 824 task_state); 825 826 if (!ret) 827 bch2_time_stats_update(j->flush_seq_time, start_time); 828 829 return ret ?: ret2 < 0 ? ret2 : 0; 830 } 831 832 /* 833 * bch2_journal_flush_async - if there is an open journal entry, or a journal 834 * still being written, write it and wait for the write to complete 835 */ 836 void bch2_journal_flush_async(struct journal *j, struct closure *parent) 837 { 838 bch2_journal_flush_seq_async(j, atomic64_read(&j->seq), parent); 839 } 840 841 int bch2_journal_flush(struct journal *j) 842 { 843 return bch2_journal_flush_seq(j, atomic64_read(&j->seq), TASK_UNINTERRUPTIBLE); 844 } 845 846 /* 847 * bch2_journal_noflush_seq - ask the journal not to issue any flushes in the 848 * range [start, end) 849 * @seq 850 */ 851 bool bch2_journal_noflush_seq(struct journal *j, u64 start, u64 end) 852 { 853 struct bch_fs *c = container_of(j, struct bch_fs, journal); 854 u64 unwritten_seq; 855 bool ret = false; 856 857 if (!(c->sb.features & (1ULL << BCH_FEATURE_journal_no_flush))) 858 return false; 859 860 if (c->journal.flushed_seq_ondisk >= start) 861 return false; 862 863 spin_lock(&j->lock); 864 if (c->journal.flushed_seq_ondisk >= start) 865 goto out; 866 867 for (unwritten_seq = journal_last_unwritten_seq(j); 868 unwritten_seq < end; 869 unwritten_seq++) { 870 struct journal_buf *buf = journal_seq_to_buf(j, unwritten_seq); 871 872 /* journal flush already in flight, or flush requseted */ 873 if (buf->must_flush) 874 goto out; 875 876 buf->noflush = true; 877 } 878 879 ret = true; 880 out: 881 spin_unlock(&j->lock); 882 return ret; 883 } 884 885 static int __bch2_journal_meta(struct journal *j) 886 { 887 struct journal_res res = {}; 888 int ret = bch2_journal_res_get(j, &res, jset_u64s(0), 0, NULL); 889 if (ret) 890 return ret; 891 892 struct journal_buf *buf = j->buf + (res.seq & JOURNAL_BUF_MASK); 893 buf->must_flush = true; 894 895 if (!buf->flush_time) { 896 buf->flush_time = local_clock() ?: 1; 897 buf->expires = jiffies; 898 } 899 900 bch2_journal_res_put(j, &res); 901 902 return bch2_journal_flush_seq(j, res.seq, TASK_UNINTERRUPTIBLE); 903 } 904 905 int bch2_journal_meta(struct journal *j) 906 { 907 struct bch_fs *c = container_of(j, struct bch_fs, journal); 908 909 if (!bch2_write_ref_tryget(c, BCH_WRITE_REF_journal)) 910 return -EROFS; 911 912 int ret = __bch2_journal_meta(j); 913 bch2_write_ref_put(c, BCH_WRITE_REF_journal); 914 return ret; 915 } 916 917 /* block/unlock the journal: */ 918 919 void bch2_journal_unblock(struct journal *j) 920 { 921 spin_lock(&j->lock); 922 if (!--j->blocked && 923 j->cur_entry_offset_if_blocked < JOURNAL_ENTRY_CLOSED_VAL && 924 j->reservations.cur_entry_offset == JOURNAL_ENTRY_BLOCKED_VAL) { 925 union journal_res_state old, new; 926 927 old.v = atomic64_read(&j->reservations.counter); 928 do { 929 new.v = old.v; 930 new.cur_entry_offset = j->cur_entry_offset_if_blocked; 931 } while (!atomic64_try_cmpxchg(&j->reservations.counter, &old.v, new.v)); 932 } 933 spin_unlock(&j->lock); 934 935 journal_wake(j); 936 } 937 938 static void __bch2_journal_block(struct journal *j) 939 { 940 if (!j->blocked++) { 941 union journal_res_state old, new; 942 943 old.v = atomic64_read(&j->reservations.counter); 944 do { 945 j->cur_entry_offset_if_blocked = old.cur_entry_offset; 946 947 if (j->cur_entry_offset_if_blocked >= JOURNAL_ENTRY_CLOSED_VAL) 948 break; 949 950 new.v = old.v; 951 new.cur_entry_offset = JOURNAL_ENTRY_BLOCKED_VAL; 952 } while (!atomic64_try_cmpxchg(&j->reservations.counter, &old.v, new.v)); 953 954 journal_cur_buf(j)->data->u64s = cpu_to_le32(old.cur_entry_offset); 955 } 956 } 957 958 void bch2_journal_block(struct journal *j) 959 { 960 spin_lock(&j->lock); 961 __bch2_journal_block(j); 962 spin_unlock(&j->lock); 963 964 journal_quiesce(j); 965 } 966 967 static struct journal_buf *__bch2_next_write_buffer_flush_journal_buf(struct journal *j, 968 u64 max_seq, bool *blocked) 969 { 970 struct journal_buf *ret = NULL; 971 972 /* We're inside wait_event(), but using mutex_lock(: */ 973 sched_annotate_sleep(); 974 mutex_lock(&j->buf_lock); 975 spin_lock(&j->lock); 976 max_seq = min(max_seq, journal_cur_seq(j)); 977 978 for (u64 seq = journal_last_unwritten_seq(j); 979 seq <= max_seq; 980 seq++) { 981 unsigned idx = seq & JOURNAL_BUF_MASK; 982 struct journal_buf *buf = j->buf + idx; 983 984 if (buf->need_flush_to_write_buffer) { 985 union journal_res_state s; 986 s.v = atomic64_read_acquire(&j->reservations.counter); 987 988 unsigned open = seq == journal_cur_seq(j) && __journal_entry_is_open(s); 989 990 if (open && !*blocked) { 991 __bch2_journal_block(j); 992 *blocked = true; 993 } 994 995 ret = journal_state_count(s, idx) > open 996 ? ERR_PTR(-EAGAIN) 997 : buf; 998 break; 999 } 1000 } 1001 1002 spin_unlock(&j->lock); 1003 if (IS_ERR_OR_NULL(ret)) 1004 mutex_unlock(&j->buf_lock); 1005 return ret; 1006 } 1007 1008 struct journal_buf *bch2_next_write_buffer_flush_journal_buf(struct journal *j, 1009 u64 max_seq, bool *blocked) 1010 { 1011 struct journal_buf *ret; 1012 *blocked = false; 1013 1014 wait_event(j->wait, (ret = __bch2_next_write_buffer_flush_journal_buf(j, 1015 max_seq, blocked)) != ERR_PTR(-EAGAIN)); 1016 if (IS_ERR_OR_NULL(ret) && *blocked) 1017 bch2_journal_unblock(j); 1018 1019 return ret; 1020 } 1021 1022 /* allocate journal on a device: */ 1023 1024 static int __bch2_set_nr_journal_buckets(struct bch_dev *ca, unsigned nr, 1025 bool new_fs, struct closure *cl) 1026 { 1027 struct bch_fs *c = ca->fs; 1028 struct journal_device *ja = &ca->journal; 1029 u64 *new_bucket_seq = NULL, *new_buckets = NULL; 1030 struct open_bucket **ob = NULL; 1031 long *bu = NULL; 1032 unsigned i, pos, nr_got = 0, nr_want = nr - ja->nr; 1033 int ret = 0; 1034 1035 BUG_ON(nr <= ja->nr); 1036 1037 bu = kcalloc(nr_want, sizeof(*bu), GFP_KERNEL); 1038 ob = kcalloc(nr_want, sizeof(*ob), GFP_KERNEL); 1039 new_buckets = kcalloc(nr, sizeof(u64), GFP_KERNEL); 1040 new_bucket_seq = kcalloc(nr, sizeof(u64), GFP_KERNEL); 1041 if (!bu || !ob || !new_buckets || !new_bucket_seq) { 1042 ret = -BCH_ERR_ENOMEM_set_nr_journal_buckets; 1043 goto err_free; 1044 } 1045 1046 for (nr_got = 0; nr_got < nr_want; nr_got++) { 1047 enum bch_watermark watermark = new_fs 1048 ? BCH_WATERMARK_btree 1049 : BCH_WATERMARK_normal; 1050 1051 ob[nr_got] = bch2_bucket_alloc(c, ca, watermark, 1052 BCH_DATA_journal, cl); 1053 ret = PTR_ERR_OR_ZERO(ob[nr_got]); 1054 if (ret) 1055 break; 1056 1057 if (!new_fs) { 1058 ret = bch2_trans_run(c, 1059 bch2_trans_mark_metadata_bucket(trans, ca, 1060 ob[nr_got]->bucket, BCH_DATA_journal, 1061 ca->mi.bucket_size, BTREE_TRIGGER_transactional)); 1062 if (ret) { 1063 bch2_open_bucket_put(c, ob[nr_got]); 1064 bch_err_msg(c, ret, "marking new journal buckets"); 1065 break; 1066 } 1067 } 1068 1069 bu[nr_got] = ob[nr_got]->bucket; 1070 } 1071 1072 if (!nr_got) 1073 goto err_free; 1074 1075 /* Don't return an error if we successfully allocated some buckets: */ 1076 ret = 0; 1077 1078 if (c) { 1079 bch2_journal_flush_all_pins(&c->journal); 1080 bch2_journal_block(&c->journal); 1081 mutex_lock(&c->sb_lock); 1082 } 1083 1084 memcpy(new_buckets, ja->buckets, ja->nr * sizeof(u64)); 1085 memcpy(new_bucket_seq, ja->bucket_seq, ja->nr * sizeof(u64)); 1086 1087 BUG_ON(ja->discard_idx > ja->nr); 1088 1089 pos = ja->discard_idx ?: ja->nr; 1090 1091 memmove(new_buckets + pos + nr_got, 1092 new_buckets + pos, 1093 sizeof(new_buckets[0]) * (ja->nr - pos)); 1094 memmove(new_bucket_seq + pos + nr_got, 1095 new_bucket_seq + pos, 1096 sizeof(new_bucket_seq[0]) * (ja->nr - pos)); 1097 1098 for (i = 0; i < nr_got; i++) { 1099 new_buckets[pos + i] = bu[i]; 1100 new_bucket_seq[pos + i] = 0; 1101 } 1102 1103 nr = ja->nr + nr_got; 1104 1105 ret = bch2_journal_buckets_to_sb(c, ca, new_buckets, nr); 1106 if (ret) 1107 goto err_unblock; 1108 1109 bch2_write_super(c); 1110 1111 /* Commit: */ 1112 if (c) 1113 spin_lock(&c->journal.lock); 1114 1115 swap(new_buckets, ja->buckets); 1116 swap(new_bucket_seq, ja->bucket_seq); 1117 ja->nr = nr; 1118 1119 if (pos <= ja->discard_idx) 1120 ja->discard_idx = (ja->discard_idx + nr_got) % ja->nr; 1121 if (pos <= ja->dirty_idx_ondisk) 1122 ja->dirty_idx_ondisk = (ja->dirty_idx_ondisk + nr_got) % ja->nr; 1123 if (pos <= ja->dirty_idx) 1124 ja->dirty_idx = (ja->dirty_idx + nr_got) % ja->nr; 1125 if (pos <= ja->cur_idx) 1126 ja->cur_idx = (ja->cur_idx + nr_got) % ja->nr; 1127 1128 if (c) 1129 spin_unlock(&c->journal.lock); 1130 err_unblock: 1131 if (c) { 1132 bch2_journal_unblock(&c->journal); 1133 mutex_unlock(&c->sb_lock); 1134 } 1135 1136 if (ret && !new_fs) 1137 for (i = 0; i < nr_got; i++) 1138 bch2_trans_run(c, 1139 bch2_trans_mark_metadata_bucket(trans, ca, 1140 bu[i], BCH_DATA_free, 0, 1141 BTREE_TRIGGER_transactional)); 1142 err_free: 1143 for (i = 0; i < nr_got; i++) 1144 bch2_open_bucket_put(c, ob[i]); 1145 1146 kfree(new_bucket_seq); 1147 kfree(new_buckets); 1148 kfree(ob); 1149 kfree(bu); 1150 return ret; 1151 } 1152 1153 /* 1154 * Allocate more journal space at runtime - not currently making use if it, but 1155 * the code works: 1156 */ 1157 int bch2_set_nr_journal_buckets(struct bch_fs *c, struct bch_dev *ca, 1158 unsigned nr) 1159 { 1160 struct journal_device *ja = &ca->journal; 1161 struct closure cl; 1162 int ret = 0; 1163 1164 closure_init_stack(&cl); 1165 1166 down_write(&c->state_lock); 1167 1168 /* don't handle reducing nr of buckets yet: */ 1169 if (nr < ja->nr) 1170 goto unlock; 1171 1172 while (ja->nr < nr) { 1173 struct disk_reservation disk_res = { 0, 0, 0 }; 1174 1175 /* 1176 * note: journal buckets aren't really counted as _sectors_ used yet, so 1177 * we don't need the disk reservation to avoid the BUG_ON() in buckets.c 1178 * when space used goes up without a reservation - but we do need the 1179 * reservation to ensure we'll actually be able to allocate: 1180 * 1181 * XXX: that's not right, disk reservations only ensure a 1182 * filesystem-wide allocation will succeed, this is a device 1183 * specific allocation - we can hang here: 1184 */ 1185 1186 ret = bch2_disk_reservation_get(c, &disk_res, 1187 bucket_to_sector(ca, nr - ja->nr), 1, 0); 1188 if (ret) 1189 break; 1190 1191 ret = __bch2_set_nr_journal_buckets(ca, nr, false, &cl); 1192 1193 bch2_disk_reservation_put(c, &disk_res); 1194 1195 closure_sync(&cl); 1196 1197 if (ret && 1198 ret != -BCH_ERR_bucket_alloc_blocked && 1199 ret != -BCH_ERR_open_buckets_empty) 1200 break; 1201 } 1202 1203 bch_err_fn(c, ret); 1204 unlock: 1205 up_write(&c->state_lock); 1206 return ret; 1207 } 1208 1209 int bch2_dev_journal_alloc(struct bch_dev *ca, bool new_fs) 1210 { 1211 unsigned nr; 1212 int ret; 1213 1214 if (dynamic_fault("bcachefs:add:journal_alloc")) { 1215 ret = -BCH_ERR_ENOMEM_set_nr_journal_buckets; 1216 goto err; 1217 } 1218 1219 /* 1/128th of the device by default: */ 1220 nr = ca->mi.nbuckets >> 7; 1221 1222 /* 1223 * clamp journal size to 8192 buckets or 8GB (in sectors), whichever 1224 * is smaller: 1225 */ 1226 nr = clamp_t(unsigned, nr, 1227 BCH_JOURNAL_BUCKETS_MIN, 1228 min(1 << 13, 1229 (1 << 24) / ca->mi.bucket_size)); 1230 1231 ret = __bch2_set_nr_journal_buckets(ca, nr, new_fs, NULL); 1232 err: 1233 bch_err_fn(ca, ret); 1234 return ret; 1235 } 1236 1237 int bch2_fs_journal_alloc(struct bch_fs *c) 1238 { 1239 for_each_online_member(c, ca) { 1240 if (ca->journal.nr) 1241 continue; 1242 1243 int ret = bch2_dev_journal_alloc(ca, true); 1244 if (ret) { 1245 percpu_ref_put(&ca->io_ref); 1246 return ret; 1247 } 1248 } 1249 1250 return 0; 1251 } 1252 1253 /* startup/shutdown: */ 1254 1255 static bool bch2_journal_writing_to_device(struct journal *j, unsigned dev_idx) 1256 { 1257 bool ret = false; 1258 u64 seq; 1259 1260 spin_lock(&j->lock); 1261 for (seq = journal_last_unwritten_seq(j); 1262 seq <= journal_cur_seq(j) && !ret; 1263 seq++) { 1264 struct journal_buf *buf = journal_seq_to_buf(j, seq); 1265 1266 if (bch2_bkey_has_device_c(bkey_i_to_s_c(&buf->key), dev_idx)) 1267 ret = true; 1268 } 1269 spin_unlock(&j->lock); 1270 1271 return ret; 1272 } 1273 1274 void bch2_dev_journal_stop(struct journal *j, struct bch_dev *ca) 1275 { 1276 wait_event(j->wait, !bch2_journal_writing_to_device(j, ca->dev_idx)); 1277 } 1278 1279 void bch2_fs_journal_stop(struct journal *j) 1280 { 1281 if (!test_bit(JOURNAL_running, &j->flags)) 1282 return; 1283 1284 bch2_journal_reclaim_stop(j); 1285 bch2_journal_flush_all_pins(j); 1286 1287 wait_event(j->wait, bch2_journal_entry_close(j)); 1288 1289 /* 1290 * Always write a new journal entry, to make sure the clock hands are up 1291 * to date (and match the superblock) 1292 */ 1293 __bch2_journal_meta(j); 1294 1295 journal_quiesce(j); 1296 cancel_delayed_work_sync(&j->write_work); 1297 1298 WARN(!bch2_journal_error(j) && 1299 test_bit(JOURNAL_replay_done, &j->flags) && 1300 j->last_empty_seq != journal_cur_seq(j), 1301 "journal shutdown error: cur seq %llu but last empty seq %llu", 1302 journal_cur_seq(j), j->last_empty_seq); 1303 1304 if (!bch2_journal_error(j)) 1305 clear_bit(JOURNAL_running, &j->flags); 1306 } 1307 1308 int bch2_fs_journal_start(struct journal *j, u64 cur_seq) 1309 { 1310 struct bch_fs *c = container_of(j, struct bch_fs, journal); 1311 struct journal_entry_pin_list *p; 1312 struct journal_replay *i, **_i; 1313 struct genradix_iter iter; 1314 bool had_entries = false; 1315 u64 last_seq = cur_seq, nr, seq; 1316 1317 if (cur_seq >= JOURNAL_SEQ_MAX) { 1318 bch_err(c, "cannot start: journal seq overflow"); 1319 return -EINVAL; 1320 } 1321 1322 genradix_for_each_reverse(&c->journal_entries, iter, _i) { 1323 i = *_i; 1324 1325 if (journal_replay_ignore(i)) 1326 continue; 1327 1328 last_seq = le64_to_cpu(i->j.last_seq); 1329 break; 1330 } 1331 1332 nr = cur_seq - last_seq; 1333 1334 if (nr + 1 > j->pin.size) { 1335 free_fifo(&j->pin); 1336 init_fifo(&j->pin, roundup_pow_of_two(nr + 1), GFP_KERNEL); 1337 if (!j->pin.data) { 1338 bch_err(c, "error reallocating journal fifo (%llu open entries)", nr); 1339 return -BCH_ERR_ENOMEM_journal_pin_fifo; 1340 } 1341 } 1342 1343 j->replay_journal_seq = last_seq; 1344 j->replay_journal_seq_end = cur_seq; 1345 j->last_seq_ondisk = last_seq; 1346 j->flushed_seq_ondisk = cur_seq - 1; 1347 j->seq_ondisk = cur_seq - 1; 1348 j->pin.front = last_seq; 1349 j->pin.back = cur_seq; 1350 atomic64_set(&j->seq, cur_seq - 1); 1351 1352 fifo_for_each_entry_ptr(p, &j->pin, seq) 1353 journal_pin_list_init(p, 1); 1354 1355 genradix_for_each(&c->journal_entries, iter, _i) { 1356 i = *_i; 1357 1358 if (journal_replay_ignore(i)) 1359 continue; 1360 1361 seq = le64_to_cpu(i->j.seq); 1362 BUG_ON(seq >= cur_seq); 1363 1364 if (seq < last_seq) 1365 continue; 1366 1367 if (journal_entry_empty(&i->j)) 1368 j->last_empty_seq = le64_to_cpu(i->j.seq); 1369 1370 p = journal_seq_pin(j, seq); 1371 1372 p->devs.nr = 0; 1373 darray_for_each(i->ptrs, ptr) 1374 bch2_dev_list_add_dev(&p->devs, ptr->dev); 1375 1376 had_entries = true; 1377 } 1378 1379 if (!had_entries) 1380 j->last_empty_seq = cur_seq - 1; /* to match j->seq */ 1381 1382 spin_lock(&j->lock); 1383 1384 set_bit(JOURNAL_running, &j->flags); 1385 j->last_flush_write = jiffies; 1386 1387 j->reservations.idx = j->reservations.unwritten_idx = journal_cur_seq(j); 1388 j->reservations.unwritten_idx++; 1389 1390 c->last_bucket_seq_cleanup = journal_cur_seq(j); 1391 1392 bch2_journal_space_available(j); 1393 spin_unlock(&j->lock); 1394 1395 return bch2_journal_reclaim_start(j); 1396 } 1397 1398 /* init/exit: */ 1399 1400 void bch2_dev_journal_exit(struct bch_dev *ca) 1401 { 1402 struct journal_device *ja = &ca->journal; 1403 1404 for (unsigned i = 0; i < ARRAY_SIZE(ja->bio); i++) { 1405 kfree(ja->bio[i]); 1406 ja->bio[i] = NULL; 1407 } 1408 1409 kfree(ja->buckets); 1410 kfree(ja->bucket_seq); 1411 ja->buckets = NULL; 1412 ja->bucket_seq = NULL; 1413 } 1414 1415 int bch2_dev_journal_init(struct bch_dev *ca, struct bch_sb *sb) 1416 { 1417 struct journal_device *ja = &ca->journal; 1418 struct bch_sb_field_journal *journal_buckets = 1419 bch2_sb_field_get(sb, journal); 1420 struct bch_sb_field_journal_v2 *journal_buckets_v2 = 1421 bch2_sb_field_get(sb, journal_v2); 1422 1423 ja->nr = 0; 1424 1425 if (journal_buckets_v2) { 1426 unsigned nr = bch2_sb_field_journal_v2_nr_entries(journal_buckets_v2); 1427 1428 for (unsigned i = 0; i < nr; i++) 1429 ja->nr += le64_to_cpu(journal_buckets_v2->d[i].nr); 1430 } else if (journal_buckets) { 1431 ja->nr = bch2_nr_journal_buckets(journal_buckets); 1432 } 1433 1434 ja->bucket_seq = kcalloc(ja->nr, sizeof(u64), GFP_KERNEL); 1435 if (!ja->bucket_seq) 1436 return -BCH_ERR_ENOMEM_dev_journal_init; 1437 1438 unsigned nr_bvecs = DIV_ROUND_UP(JOURNAL_ENTRY_SIZE_MAX, PAGE_SIZE); 1439 1440 for (unsigned i = 0; i < ARRAY_SIZE(ja->bio); i++) { 1441 ja->bio[i] = kmalloc(struct_size(ja->bio[i], bio.bi_inline_vecs, 1442 nr_bvecs), GFP_KERNEL); 1443 if (!ja->bio[i]) 1444 return -BCH_ERR_ENOMEM_dev_journal_init; 1445 1446 ja->bio[i]->ca = ca; 1447 ja->bio[i]->buf_idx = i; 1448 bio_init(&ja->bio[i]->bio, NULL, ja->bio[i]->bio.bi_inline_vecs, nr_bvecs, 0); 1449 } 1450 1451 ja->buckets = kcalloc(ja->nr, sizeof(u64), GFP_KERNEL); 1452 if (!ja->buckets) 1453 return -BCH_ERR_ENOMEM_dev_journal_init; 1454 1455 if (journal_buckets_v2) { 1456 unsigned nr = bch2_sb_field_journal_v2_nr_entries(journal_buckets_v2); 1457 unsigned dst = 0; 1458 1459 for (unsigned i = 0; i < nr; i++) 1460 for (unsigned j = 0; j < le64_to_cpu(journal_buckets_v2->d[i].nr); j++) 1461 ja->buckets[dst++] = 1462 le64_to_cpu(journal_buckets_v2->d[i].start) + j; 1463 } else if (journal_buckets) { 1464 for (unsigned i = 0; i < ja->nr; i++) 1465 ja->buckets[i] = le64_to_cpu(journal_buckets->buckets[i]); 1466 } 1467 1468 return 0; 1469 } 1470 1471 void bch2_fs_journal_exit(struct journal *j) 1472 { 1473 if (j->wq) 1474 destroy_workqueue(j->wq); 1475 1476 darray_exit(&j->early_journal_entries); 1477 1478 for (unsigned i = 0; i < ARRAY_SIZE(j->buf); i++) 1479 kvfree(j->buf[i].data); 1480 free_fifo(&j->pin); 1481 } 1482 1483 int bch2_fs_journal_init(struct journal *j) 1484 { 1485 static struct lock_class_key res_key; 1486 1487 mutex_init(&j->buf_lock); 1488 spin_lock_init(&j->lock); 1489 spin_lock_init(&j->err_lock); 1490 init_waitqueue_head(&j->wait); 1491 INIT_DELAYED_WORK(&j->write_work, journal_write_work); 1492 init_waitqueue_head(&j->reclaim_wait); 1493 init_waitqueue_head(&j->pin_flush_wait); 1494 mutex_init(&j->reclaim_lock); 1495 mutex_init(&j->discard_lock); 1496 1497 lockdep_init_map(&j->res_map, "journal res", &res_key, 0); 1498 1499 atomic64_set(&j->reservations.counter, 1500 ((union journal_res_state) 1501 { .cur_entry_offset = JOURNAL_ENTRY_CLOSED_VAL }).v); 1502 1503 if (!(init_fifo(&j->pin, JOURNAL_PIN, GFP_KERNEL))) 1504 return -BCH_ERR_ENOMEM_journal_pin_fifo; 1505 1506 for (unsigned i = 0; i < ARRAY_SIZE(j->buf); i++) { 1507 j->buf[i].buf_size = JOURNAL_ENTRY_SIZE_MIN; 1508 j->buf[i].data = kvmalloc(j->buf[i].buf_size, GFP_KERNEL); 1509 if (!j->buf[i].data) 1510 return -BCH_ERR_ENOMEM_journal_buf; 1511 j->buf[i].idx = i; 1512 } 1513 1514 j->pin.front = j->pin.back = 1; 1515 1516 j->wq = alloc_workqueue("bcachefs_journal", 1517 WQ_HIGHPRI|WQ_FREEZABLE|WQ_UNBOUND|WQ_MEM_RECLAIM, 512); 1518 if (!j->wq) 1519 return -BCH_ERR_ENOMEM_fs_other_alloc; 1520 return 0; 1521 } 1522 1523 /* debug: */ 1524 1525 static const char * const bch2_journal_flags_strs[] = { 1526 #define x(n) #n, 1527 JOURNAL_FLAGS() 1528 #undef x 1529 NULL 1530 }; 1531 1532 void __bch2_journal_debug_to_text(struct printbuf *out, struct journal *j) 1533 { 1534 struct bch_fs *c = container_of(j, struct bch_fs, journal); 1535 union journal_res_state s; 1536 unsigned long now = jiffies; 1537 u64 nr_writes = j->nr_flush_writes + j->nr_noflush_writes; 1538 1539 printbuf_tabstops_reset(out); 1540 printbuf_tabstop_push(out, 28); 1541 out->atomic++; 1542 1543 rcu_read_lock(); 1544 s = READ_ONCE(j->reservations); 1545 1546 prt_printf(out, "flags:\t"); 1547 prt_bitflags(out, bch2_journal_flags_strs, j->flags); 1548 prt_newline(out); 1549 prt_printf(out, "dirty journal entries:\t%llu/%llu\n", fifo_used(&j->pin), j->pin.size); 1550 prt_printf(out, "seq:\t%llu\n", journal_cur_seq(j)); 1551 prt_printf(out, "seq_ondisk:\t%llu\n", j->seq_ondisk); 1552 prt_printf(out, "last_seq:\t%llu\n", journal_last_seq(j)); 1553 prt_printf(out, "last_seq_ondisk:\t%llu\n", j->last_seq_ondisk); 1554 prt_printf(out, "flushed_seq_ondisk:\t%llu\n", j->flushed_seq_ondisk); 1555 prt_printf(out, "watermark:\t%s\n", bch2_watermarks[j->watermark]); 1556 prt_printf(out, "each entry reserved:\t%u\n", j->entry_u64s_reserved); 1557 prt_printf(out, "nr flush writes:\t%llu\n", j->nr_flush_writes); 1558 prt_printf(out, "nr noflush writes:\t%llu\n", j->nr_noflush_writes); 1559 prt_printf(out, "average write size:\t"); 1560 prt_human_readable_u64(out, nr_writes ? div64_u64(j->entry_bytes_written, nr_writes) : 0); 1561 prt_newline(out); 1562 prt_printf(out, "nr direct reclaim:\t%llu\n", j->nr_direct_reclaim); 1563 prt_printf(out, "nr background reclaim:\t%llu\n", j->nr_background_reclaim); 1564 prt_printf(out, "reclaim kicked:\t%u\n", j->reclaim_kicked); 1565 prt_printf(out, "reclaim runs in:\t%u ms\n", time_after(j->next_reclaim, now) 1566 ? jiffies_to_msecs(j->next_reclaim - jiffies) : 0); 1567 prt_printf(out, "blocked:\t%u\n", j->blocked); 1568 prt_printf(out, "current entry sectors:\t%u\n", j->cur_entry_sectors); 1569 prt_printf(out, "current entry error:\t%s\n", bch2_journal_errors[j->cur_entry_error]); 1570 prt_printf(out, "current entry:\t"); 1571 1572 switch (s.cur_entry_offset) { 1573 case JOURNAL_ENTRY_ERROR_VAL: 1574 prt_printf(out, "error\n"); 1575 break; 1576 case JOURNAL_ENTRY_CLOSED_VAL: 1577 prt_printf(out, "closed\n"); 1578 break; 1579 case JOURNAL_ENTRY_BLOCKED_VAL: 1580 prt_printf(out, "blocked\n"); 1581 break; 1582 default: 1583 prt_printf(out, "%u/%u\n", s.cur_entry_offset, j->cur_entry_u64s); 1584 break; 1585 } 1586 1587 prt_printf(out, "unwritten entries:\n"); 1588 bch2_journal_bufs_to_text(out, j); 1589 1590 prt_printf(out, "space:\n"); 1591 printbuf_indent_add(out, 2); 1592 prt_printf(out, "discarded\t%u:%u\n", 1593 j->space[journal_space_discarded].next_entry, 1594 j->space[journal_space_discarded].total); 1595 prt_printf(out, "clean ondisk\t%u:%u\n", 1596 j->space[journal_space_clean_ondisk].next_entry, 1597 j->space[journal_space_clean_ondisk].total); 1598 prt_printf(out, "clean\t%u:%u\n", 1599 j->space[journal_space_clean].next_entry, 1600 j->space[journal_space_clean].total); 1601 prt_printf(out, "total\t%u:%u\n", 1602 j->space[journal_space_total].next_entry, 1603 j->space[journal_space_total].total); 1604 printbuf_indent_sub(out, 2); 1605 1606 for_each_member_device_rcu(c, ca, &c->rw_devs[BCH_DATA_journal]) { 1607 if (!ca->mi.durability) 1608 continue; 1609 1610 struct journal_device *ja = &ca->journal; 1611 1612 if (!test_bit(ca->dev_idx, c->rw_devs[BCH_DATA_journal].d)) 1613 continue; 1614 1615 if (!ja->nr) 1616 continue; 1617 1618 prt_printf(out, "dev %u:\n", ca->dev_idx); 1619 prt_printf(out, "durability %u:\n", ca->mi.durability); 1620 printbuf_indent_add(out, 2); 1621 prt_printf(out, "nr\t%u\n", ja->nr); 1622 prt_printf(out, "bucket size\t%u\n", ca->mi.bucket_size); 1623 prt_printf(out, "available\t%u:%u\n", bch2_journal_dev_buckets_available(j, ja, journal_space_discarded), ja->sectors_free); 1624 prt_printf(out, "discard_idx\t%u\n", ja->discard_idx); 1625 prt_printf(out, "dirty_ondisk\t%u (seq %llu)\n",ja->dirty_idx_ondisk, ja->bucket_seq[ja->dirty_idx_ondisk]); 1626 prt_printf(out, "dirty_idx\t%u (seq %llu)\n", ja->dirty_idx, ja->bucket_seq[ja->dirty_idx]); 1627 prt_printf(out, "cur_idx\t%u (seq %llu)\n", ja->cur_idx, ja->bucket_seq[ja->cur_idx]); 1628 printbuf_indent_sub(out, 2); 1629 } 1630 1631 prt_printf(out, "replicas want %u need %u\n", c->opts.metadata_replicas, c->opts.metadata_replicas_required); 1632 1633 rcu_read_unlock(); 1634 1635 --out->atomic; 1636 } 1637 1638 void bch2_journal_debug_to_text(struct printbuf *out, struct journal *j) 1639 { 1640 spin_lock(&j->lock); 1641 __bch2_journal_debug_to_text(out, j); 1642 spin_unlock(&j->lock); 1643 } 1644