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 static bool journal_entry_want_write(struct journal *j) 323 { 324 bool ret = !journal_entry_is_open(j) || 325 journal_cur_seq(j) == journal_last_unwritten_seq(j); 326 327 /* Don't close it yet if we already have a write in flight: */ 328 if (ret) 329 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true); 330 else if (nr_unwritten_journal_entries(j)) { 331 struct journal_buf *buf = journal_cur_buf(j); 332 333 if (!buf->flush_time) { 334 buf->flush_time = local_clock() ?: 1; 335 buf->expires = jiffies; 336 } 337 } 338 339 return ret; 340 } 341 342 bool bch2_journal_entry_close(struct journal *j) 343 { 344 bool ret; 345 346 spin_lock(&j->lock); 347 ret = journal_entry_want_write(j); 348 spin_unlock(&j->lock); 349 350 return ret; 351 } 352 353 /* 354 * should _only_ called from journal_res_get() - when we actually want a 355 * journal reservation - journal entry is open means journal is dirty: 356 */ 357 static int journal_entry_open(struct journal *j) 358 { 359 struct bch_fs *c = container_of(j, struct bch_fs, journal); 360 struct journal_buf *buf = j->buf + 361 ((journal_cur_seq(j) + 1) & JOURNAL_BUF_MASK); 362 union journal_res_state old, new; 363 int u64s; 364 365 lockdep_assert_held(&j->lock); 366 BUG_ON(journal_entry_is_open(j)); 367 BUG_ON(BCH_SB_CLEAN(c->disk_sb.sb)); 368 369 if (j->blocked) 370 return JOURNAL_ERR_blocked; 371 372 if (j->cur_entry_error) 373 return j->cur_entry_error; 374 375 if (bch2_journal_error(j)) 376 return JOURNAL_ERR_insufficient_devices; /* -EROFS */ 377 378 if (!fifo_free(&j->pin)) 379 return JOURNAL_ERR_journal_pin_full; 380 381 if (nr_unwritten_journal_entries(j) == ARRAY_SIZE(j->buf)) 382 return JOURNAL_ERR_max_in_flight; 383 384 if (bch2_fs_fatal_err_on(journal_cur_seq(j) >= JOURNAL_SEQ_MAX, 385 c, "cannot start: journal seq overflow")) 386 return JOURNAL_ERR_insufficient_devices; /* -EROFS */ 387 388 BUG_ON(!j->cur_entry_sectors); 389 390 buf->expires = 391 (journal_cur_seq(j) == j->flushed_seq_ondisk 392 ? jiffies 393 : j->last_flush_write) + 394 msecs_to_jiffies(c->opts.journal_flush_delay); 395 396 buf->u64s_reserved = j->entry_u64s_reserved; 397 buf->disk_sectors = j->cur_entry_sectors; 398 buf->sectors = min(buf->disk_sectors, buf->buf_size >> 9); 399 400 u64s = (int) (buf->sectors << 9) / sizeof(u64) - 401 journal_entry_overhead(j); 402 u64s = clamp_t(int, u64s, 0, JOURNAL_ENTRY_CLOSED_VAL - 1); 403 404 if (u64s <= (ssize_t) j->early_journal_entries.nr) 405 return JOURNAL_ERR_journal_full; 406 407 if (fifo_empty(&j->pin) && j->reclaim_thread) 408 wake_up_process(j->reclaim_thread); 409 410 /* 411 * The fifo_push() needs to happen at the same time as j->seq is 412 * incremented for journal_last_seq() to be calculated correctly 413 */ 414 atomic64_inc(&j->seq); 415 journal_pin_list_init(fifo_push_ref(&j->pin), 1); 416 417 BUG_ON(j->pin.back - 1 != atomic64_read(&j->seq)); 418 419 BUG_ON(j->buf + (journal_cur_seq(j) & JOURNAL_BUF_MASK) != buf); 420 421 bkey_extent_init(&buf->key); 422 buf->noflush = false; 423 buf->must_flush = false; 424 buf->separate_flush = false; 425 buf->flush_time = 0; 426 buf->need_flush_to_write_buffer = true; 427 buf->write_started = false; 428 buf->write_allocated = false; 429 buf->write_done = false; 430 431 memset(buf->data, 0, sizeof(*buf->data)); 432 buf->data->seq = cpu_to_le64(journal_cur_seq(j)); 433 buf->data->u64s = 0; 434 435 if (j->early_journal_entries.nr) { 436 memcpy(buf->data->_data, j->early_journal_entries.data, 437 j->early_journal_entries.nr * sizeof(u64)); 438 le32_add_cpu(&buf->data->u64s, j->early_journal_entries.nr); 439 } 440 441 /* 442 * Must be set before marking the journal entry as open: 443 */ 444 j->cur_entry_u64s = u64s; 445 446 old.v = atomic64_read(&j->reservations.counter); 447 do { 448 new.v = old.v; 449 450 BUG_ON(old.cur_entry_offset == JOURNAL_ENTRY_ERROR_VAL); 451 452 new.idx++; 453 BUG_ON(journal_state_count(new, new.idx)); 454 BUG_ON(new.idx != (journal_cur_seq(j) & JOURNAL_BUF_MASK)); 455 456 journal_state_inc(&new); 457 458 /* Handle any already added entries */ 459 new.cur_entry_offset = le32_to_cpu(buf->data->u64s); 460 } while (!atomic64_try_cmpxchg(&j->reservations.counter, 461 &old.v, new.v)); 462 463 if (nr_unwritten_journal_entries(j) == 1) 464 mod_delayed_work(j->wq, 465 &j->write_work, 466 msecs_to_jiffies(c->opts.journal_flush_delay)); 467 journal_wake(j); 468 469 if (j->early_journal_entries.nr) 470 darray_exit(&j->early_journal_entries); 471 return 0; 472 } 473 474 static bool journal_quiesced(struct journal *j) 475 { 476 bool ret = atomic64_read(&j->seq) == j->seq_ondisk; 477 478 if (!ret) 479 bch2_journal_entry_close(j); 480 return ret; 481 } 482 483 static void journal_quiesce(struct journal *j) 484 { 485 wait_event(j->wait, journal_quiesced(j)); 486 } 487 488 static void journal_write_work(struct work_struct *work) 489 { 490 struct journal *j = container_of(work, struct journal, write_work.work); 491 492 spin_lock(&j->lock); 493 if (__journal_entry_is_open(j->reservations)) { 494 long delta = journal_cur_buf(j)->expires - jiffies; 495 496 if (delta > 0) 497 mod_delayed_work(j->wq, &j->write_work, delta); 498 else 499 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true); 500 } 501 spin_unlock(&j->lock); 502 } 503 504 static int __journal_res_get(struct journal *j, struct journal_res *res, 505 unsigned flags) 506 { 507 struct bch_fs *c = container_of(j, struct bch_fs, journal); 508 struct journal_buf *buf; 509 bool can_discard; 510 int ret; 511 retry: 512 if (journal_res_get_fast(j, res, flags)) 513 return 0; 514 515 if (bch2_journal_error(j)) 516 return -BCH_ERR_erofs_journal_err; 517 518 if (j->blocked) 519 return -BCH_ERR_journal_res_get_blocked; 520 521 if ((flags & BCH_WATERMARK_MASK) < j->watermark) { 522 ret = JOURNAL_ERR_journal_full; 523 can_discard = j->can_discard; 524 goto out; 525 } 526 527 if (nr_unwritten_journal_entries(j) == ARRAY_SIZE(j->buf) && !journal_entry_is_open(j)) { 528 ret = JOURNAL_ERR_max_in_flight; 529 goto out; 530 } 531 532 spin_lock(&j->lock); 533 534 /* 535 * Recheck after taking the lock, so we don't race with another thread 536 * that just did journal_entry_open() and call bch2_journal_entry_close() 537 * unnecessarily 538 */ 539 if (journal_res_get_fast(j, res, flags)) { 540 ret = 0; 541 goto unlock; 542 } 543 544 /* 545 * If we couldn't get a reservation because the current buf filled up, 546 * and we had room for a bigger entry on disk, signal that we want to 547 * realloc the journal bufs: 548 */ 549 buf = journal_cur_buf(j); 550 if (journal_entry_is_open(j) && 551 buf->buf_size >> 9 < buf->disk_sectors && 552 buf->buf_size < JOURNAL_ENTRY_SIZE_MAX) 553 j->buf_size_want = max(j->buf_size_want, buf->buf_size << 1); 554 555 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, false); 556 ret = journal_entry_open(j) ?: JOURNAL_ERR_retry; 557 unlock: 558 can_discard = j->can_discard; 559 spin_unlock(&j->lock); 560 out: 561 if (ret == JOURNAL_ERR_retry) 562 goto retry; 563 if (!ret) 564 return 0; 565 566 if (journal_error_check_stuck(j, ret, flags)) 567 ret = -BCH_ERR_journal_res_get_blocked; 568 569 if (ret == JOURNAL_ERR_max_in_flight && 570 track_event_change(&c->times[BCH_TIME_blocked_journal_max_in_flight], true)) { 571 572 struct printbuf buf = PRINTBUF; 573 prt_printf(&buf, "seq %llu\n", journal_cur_seq(j)); 574 bch2_journal_bufs_to_text(&buf, j); 575 trace_journal_entry_full(c, buf.buf); 576 printbuf_exit(&buf); 577 count_event(c, journal_entry_full); 578 } 579 580 /* 581 * Journal is full - can't rely on reclaim from work item due to 582 * freezing: 583 */ 584 if ((ret == JOURNAL_ERR_journal_full || 585 ret == JOURNAL_ERR_journal_pin_full) && 586 !(flags & JOURNAL_RES_GET_NONBLOCK)) { 587 if (can_discard) { 588 bch2_journal_do_discards(j); 589 goto retry; 590 } 591 592 if (mutex_trylock(&j->reclaim_lock)) { 593 bch2_journal_reclaim(j); 594 mutex_unlock(&j->reclaim_lock); 595 } 596 } 597 598 return ret == JOURNAL_ERR_insufficient_devices 599 ? -BCH_ERR_erofs_journal_err 600 : -BCH_ERR_journal_res_get_blocked; 601 } 602 603 static unsigned max_dev_latency(struct bch_fs *c) 604 { 605 u64 nsecs = 0; 606 607 for_each_rw_member(c, ca) 608 nsecs = max(nsecs, ca->io_latency[WRITE].stats.max_duration); 609 610 return nsecs_to_jiffies(nsecs); 611 } 612 613 /* 614 * Essentially the entry function to the journaling code. When bcachefs is doing 615 * a btree insert, it calls this function to get the current journal write. 616 * Journal write is the structure used set up journal writes. The calling 617 * function will then add its keys to the structure, queuing them for the next 618 * write. 619 * 620 * To ensure forward progress, the current task must not be holding any 621 * btree node write locks. 622 */ 623 int bch2_journal_res_get_slowpath(struct journal *j, struct journal_res *res, 624 unsigned flags, 625 struct btree_trans *trans) 626 { 627 int ret; 628 629 if (closure_wait_event_timeout(&j->async_wait, 630 (ret = __journal_res_get(j, res, flags)) != -BCH_ERR_journal_res_get_blocked || 631 (flags & JOURNAL_RES_GET_NONBLOCK), 632 HZ)) 633 return ret; 634 635 if (trans) 636 bch2_trans_unlock_long(trans); 637 638 struct bch_fs *c = container_of(j, struct bch_fs, journal); 639 int remaining_wait = max(max_dev_latency(c) * 2, HZ * 10); 640 641 remaining_wait = max(0, remaining_wait - HZ); 642 643 if (closure_wait_event_timeout(&j->async_wait, 644 (ret = __journal_res_get(j, res, flags)) != -BCH_ERR_journal_res_get_blocked || 645 (flags & JOURNAL_RES_GET_NONBLOCK), 646 remaining_wait)) 647 return ret; 648 649 struct printbuf buf = PRINTBUF; 650 bch2_journal_debug_to_text(&buf, j); 651 bch_err(c, "Journal stuck? Waited for 10 seconds...\n%s", 652 buf.buf); 653 printbuf_exit(&buf); 654 655 closure_wait_event(&j->async_wait, 656 (ret = __journal_res_get(j, res, flags)) != -BCH_ERR_journal_res_get_blocked || 657 (flags & JOURNAL_RES_GET_NONBLOCK)); 658 return ret; 659 } 660 661 /* journal_entry_res: */ 662 663 void bch2_journal_entry_res_resize(struct journal *j, 664 struct journal_entry_res *res, 665 unsigned new_u64s) 666 { 667 union journal_res_state state; 668 int d = new_u64s - res->u64s; 669 670 spin_lock(&j->lock); 671 672 j->entry_u64s_reserved += d; 673 if (d <= 0) 674 goto out; 675 676 j->cur_entry_u64s = max_t(int, 0, j->cur_entry_u64s - d); 677 smp_mb(); 678 state = READ_ONCE(j->reservations); 679 680 if (state.cur_entry_offset < JOURNAL_ENTRY_CLOSED_VAL && 681 state.cur_entry_offset > j->cur_entry_u64s) { 682 j->cur_entry_u64s += d; 683 /* 684 * Not enough room in current journal entry, have to flush it: 685 */ 686 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true); 687 } else { 688 journal_cur_buf(j)->u64s_reserved += d; 689 } 690 out: 691 spin_unlock(&j->lock); 692 res->u64s += d; 693 } 694 695 /* journal flushing: */ 696 697 /** 698 * bch2_journal_flush_seq_async - wait for a journal entry to be written 699 * @j: journal object 700 * @seq: seq to flush 701 * @parent: closure object to wait with 702 * Returns: 1 if @seq has already been flushed, 0 if @seq is being flushed, 703 * -BCH_ERR_journal_flush_err if @seq will never be flushed 704 * 705 * Like bch2_journal_wait_on_seq, except that it triggers a write immediately if 706 * necessary 707 */ 708 int bch2_journal_flush_seq_async(struct journal *j, u64 seq, 709 struct closure *parent) 710 { 711 struct journal_buf *buf; 712 int ret = 0; 713 714 if (seq <= j->flushed_seq_ondisk) 715 return 1; 716 717 spin_lock(&j->lock); 718 719 if (WARN_ONCE(seq > journal_cur_seq(j), 720 "requested to flush journal seq %llu, but currently at %llu", 721 seq, journal_cur_seq(j))) 722 goto out; 723 724 /* Recheck under lock: */ 725 if (j->err_seq && seq >= j->err_seq) { 726 ret = -BCH_ERR_journal_flush_err; 727 goto out; 728 } 729 730 if (seq <= j->flushed_seq_ondisk) { 731 ret = 1; 732 goto out; 733 } 734 735 /* if seq was written, but not flushed - flush a newer one instead */ 736 seq = max(seq, journal_last_unwritten_seq(j)); 737 738 recheck_need_open: 739 if (seq > journal_cur_seq(j)) { 740 struct journal_res res = { 0 }; 741 742 if (journal_entry_is_open(j)) 743 __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true); 744 745 spin_unlock(&j->lock); 746 747 /* 748 * We're called from bch2_journal_flush_seq() -> wait_event(); 749 * but this might block. We won't usually block, so we won't 750 * livelock: 751 */ 752 sched_annotate_sleep(); 753 ret = bch2_journal_res_get(j, &res, jset_u64s(0), 0, NULL); 754 if (ret) 755 return ret; 756 757 seq = res.seq; 758 buf = journal_seq_to_buf(j, seq); 759 buf->must_flush = true; 760 761 if (!buf->flush_time) { 762 buf->flush_time = local_clock() ?: 1; 763 buf->expires = jiffies; 764 } 765 766 if (parent && !closure_wait(&buf->wait, parent)) 767 BUG(); 768 769 bch2_journal_res_put(j, &res); 770 771 spin_lock(&j->lock); 772 goto want_write; 773 } 774 775 /* 776 * if write was kicked off without a flush, or if we promised it 777 * wouldn't be a flush, flush the next sequence number instead 778 */ 779 buf = journal_seq_to_buf(j, seq); 780 if (buf->noflush) { 781 seq++; 782 goto recheck_need_open; 783 } 784 785 buf->must_flush = true; 786 787 if (parent && !closure_wait(&buf->wait, parent)) 788 BUG(); 789 want_write: 790 if (seq == journal_cur_seq(j)) 791 journal_entry_want_write(j); 792 out: 793 spin_unlock(&j->lock); 794 return ret; 795 } 796 797 int bch2_journal_flush_seq(struct journal *j, u64 seq, unsigned task_state) 798 { 799 u64 start_time = local_clock(); 800 int ret, ret2; 801 802 /* 803 * Don't update time_stats when @seq is already flushed: 804 */ 805 if (seq <= j->flushed_seq_ondisk) 806 return 0; 807 808 ret = wait_event_state(j->wait, 809 (ret2 = bch2_journal_flush_seq_async(j, seq, NULL)), 810 task_state); 811 812 if (!ret) 813 bch2_time_stats_update(j->flush_seq_time, start_time); 814 815 return ret ?: ret2 < 0 ? ret2 : 0; 816 } 817 818 /* 819 * bch2_journal_flush_async - if there is an open journal entry, or a journal 820 * still being written, write it and wait for the write to complete 821 */ 822 void bch2_journal_flush_async(struct journal *j, struct closure *parent) 823 { 824 bch2_journal_flush_seq_async(j, atomic64_read(&j->seq), parent); 825 } 826 827 int bch2_journal_flush(struct journal *j) 828 { 829 return bch2_journal_flush_seq(j, atomic64_read(&j->seq), TASK_UNINTERRUPTIBLE); 830 } 831 832 /* 833 * bch2_journal_noflush_seq - ask the journal not to issue any flushes in the 834 * range [start, end) 835 * @seq 836 */ 837 bool bch2_journal_noflush_seq(struct journal *j, u64 start, u64 end) 838 { 839 struct bch_fs *c = container_of(j, struct bch_fs, journal); 840 u64 unwritten_seq; 841 bool ret = false; 842 843 if (!(c->sb.features & (1ULL << BCH_FEATURE_journal_no_flush))) 844 return false; 845 846 if (c->journal.flushed_seq_ondisk >= start) 847 return false; 848 849 spin_lock(&j->lock); 850 if (c->journal.flushed_seq_ondisk >= start) 851 goto out; 852 853 for (unwritten_seq = journal_last_unwritten_seq(j); 854 unwritten_seq < end; 855 unwritten_seq++) { 856 struct journal_buf *buf = journal_seq_to_buf(j, unwritten_seq); 857 858 /* journal flush already in flight, or flush requseted */ 859 if (buf->must_flush) 860 goto out; 861 862 buf->noflush = true; 863 } 864 865 ret = true; 866 out: 867 spin_unlock(&j->lock); 868 return ret; 869 } 870 871 static int __bch2_journal_meta(struct journal *j) 872 { 873 struct journal_res res = {}; 874 int ret = bch2_journal_res_get(j, &res, jset_u64s(0), 0, NULL); 875 if (ret) 876 return ret; 877 878 struct journal_buf *buf = j->buf + (res.seq & JOURNAL_BUF_MASK); 879 buf->must_flush = true; 880 881 if (!buf->flush_time) { 882 buf->flush_time = local_clock() ?: 1; 883 buf->expires = jiffies; 884 } 885 886 bch2_journal_res_put(j, &res); 887 888 return bch2_journal_flush_seq(j, res.seq, TASK_UNINTERRUPTIBLE); 889 } 890 891 int bch2_journal_meta(struct journal *j) 892 { 893 struct bch_fs *c = container_of(j, struct bch_fs, journal); 894 895 if (!bch2_write_ref_tryget(c, BCH_WRITE_REF_journal)) 896 return -EROFS; 897 898 int ret = __bch2_journal_meta(j); 899 bch2_write_ref_put(c, BCH_WRITE_REF_journal); 900 return ret; 901 } 902 903 /* block/unlock the journal: */ 904 905 void bch2_journal_unblock(struct journal *j) 906 { 907 spin_lock(&j->lock); 908 if (!--j->blocked && 909 j->cur_entry_offset_if_blocked < JOURNAL_ENTRY_CLOSED_VAL && 910 j->reservations.cur_entry_offset == JOURNAL_ENTRY_BLOCKED_VAL) { 911 union journal_res_state old, new; 912 913 old.v = atomic64_read(&j->reservations.counter); 914 do { 915 new.v = old.v; 916 new.cur_entry_offset = j->cur_entry_offset_if_blocked; 917 } while (!atomic64_try_cmpxchg(&j->reservations.counter, &old.v, new.v)); 918 } 919 spin_unlock(&j->lock); 920 921 journal_wake(j); 922 } 923 924 static void __bch2_journal_block(struct journal *j) 925 { 926 if (!j->blocked++) { 927 union journal_res_state old, new; 928 929 old.v = atomic64_read(&j->reservations.counter); 930 do { 931 j->cur_entry_offset_if_blocked = old.cur_entry_offset; 932 933 if (j->cur_entry_offset_if_blocked >= JOURNAL_ENTRY_CLOSED_VAL) 934 break; 935 936 new.v = old.v; 937 new.cur_entry_offset = JOURNAL_ENTRY_BLOCKED_VAL; 938 } while (!atomic64_try_cmpxchg(&j->reservations.counter, &old.v, new.v)); 939 940 journal_cur_buf(j)->data->u64s = cpu_to_le32(old.cur_entry_offset); 941 } 942 } 943 944 void bch2_journal_block(struct journal *j) 945 { 946 spin_lock(&j->lock); 947 __bch2_journal_block(j); 948 spin_unlock(&j->lock); 949 950 journal_quiesce(j); 951 } 952 953 static struct journal_buf *__bch2_next_write_buffer_flush_journal_buf(struct journal *j, 954 u64 max_seq, bool *blocked) 955 { 956 struct journal_buf *ret = NULL; 957 958 /* We're inside wait_event(), but using mutex_lock(: */ 959 sched_annotate_sleep(); 960 mutex_lock(&j->buf_lock); 961 spin_lock(&j->lock); 962 max_seq = min(max_seq, journal_cur_seq(j)); 963 964 for (u64 seq = journal_last_unwritten_seq(j); 965 seq <= max_seq; 966 seq++) { 967 unsigned idx = seq & JOURNAL_BUF_MASK; 968 struct journal_buf *buf = j->buf + idx; 969 970 if (buf->need_flush_to_write_buffer) { 971 union journal_res_state s; 972 s.v = atomic64_read_acquire(&j->reservations.counter); 973 974 unsigned open = seq == journal_cur_seq(j) && __journal_entry_is_open(s); 975 976 if (open && !*blocked) { 977 __bch2_journal_block(j); 978 *blocked = true; 979 } 980 981 ret = journal_state_count(s, idx) > open 982 ? ERR_PTR(-EAGAIN) 983 : buf; 984 break; 985 } 986 } 987 988 spin_unlock(&j->lock); 989 if (IS_ERR_OR_NULL(ret)) 990 mutex_unlock(&j->buf_lock); 991 return ret; 992 } 993 994 struct journal_buf *bch2_next_write_buffer_flush_journal_buf(struct journal *j, 995 u64 max_seq, bool *blocked) 996 { 997 struct journal_buf *ret; 998 *blocked = false; 999 1000 wait_event(j->wait, (ret = __bch2_next_write_buffer_flush_journal_buf(j, 1001 max_seq, blocked)) != ERR_PTR(-EAGAIN)); 1002 if (IS_ERR_OR_NULL(ret) && *blocked) 1003 bch2_journal_unblock(j); 1004 1005 return ret; 1006 } 1007 1008 /* allocate journal on a device: */ 1009 1010 static int __bch2_set_nr_journal_buckets(struct bch_dev *ca, unsigned nr, 1011 bool new_fs, struct closure *cl) 1012 { 1013 struct bch_fs *c = ca->fs; 1014 struct journal_device *ja = &ca->journal; 1015 u64 *new_bucket_seq = NULL, *new_buckets = NULL; 1016 struct open_bucket **ob = NULL; 1017 long *bu = NULL; 1018 unsigned i, pos, nr_got = 0, nr_want = nr - ja->nr; 1019 int ret = 0; 1020 1021 BUG_ON(nr <= ja->nr); 1022 1023 bu = kcalloc(nr_want, sizeof(*bu), GFP_KERNEL); 1024 ob = kcalloc(nr_want, sizeof(*ob), GFP_KERNEL); 1025 new_buckets = kcalloc(nr, sizeof(u64), GFP_KERNEL); 1026 new_bucket_seq = kcalloc(nr, sizeof(u64), GFP_KERNEL); 1027 if (!bu || !ob || !new_buckets || !new_bucket_seq) { 1028 ret = -BCH_ERR_ENOMEM_set_nr_journal_buckets; 1029 goto err_free; 1030 } 1031 1032 for (nr_got = 0; nr_got < nr_want; nr_got++) { 1033 enum bch_watermark watermark = new_fs 1034 ? BCH_WATERMARK_btree 1035 : BCH_WATERMARK_normal; 1036 1037 ob[nr_got] = bch2_bucket_alloc(c, ca, watermark, 1038 BCH_DATA_journal, cl); 1039 ret = PTR_ERR_OR_ZERO(ob[nr_got]); 1040 if (ret) 1041 break; 1042 1043 if (!new_fs) { 1044 ret = bch2_trans_run(c, 1045 bch2_trans_mark_metadata_bucket(trans, ca, 1046 ob[nr_got]->bucket, BCH_DATA_journal, 1047 ca->mi.bucket_size, BTREE_TRIGGER_transactional)); 1048 if (ret) { 1049 bch2_open_bucket_put(c, ob[nr_got]); 1050 bch_err_msg(c, ret, "marking new journal buckets"); 1051 break; 1052 } 1053 } 1054 1055 bu[nr_got] = ob[nr_got]->bucket; 1056 } 1057 1058 if (!nr_got) 1059 goto err_free; 1060 1061 /* Don't return an error if we successfully allocated some buckets: */ 1062 ret = 0; 1063 1064 if (c) { 1065 bch2_journal_flush_all_pins(&c->journal); 1066 bch2_journal_block(&c->journal); 1067 mutex_lock(&c->sb_lock); 1068 } 1069 1070 memcpy(new_buckets, ja->buckets, ja->nr * sizeof(u64)); 1071 memcpy(new_bucket_seq, ja->bucket_seq, ja->nr * sizeof(u64)); 1072 1073 BUG_ON(ja->discard_idx > ja->nr); 1074 1075 pos = ja->discard_idx ?: ja->nr; 1076 1077 memmove(new_buckets + pos + nr_got, 1078 new_buckets + pos, 1079 sizeof(new_buckets[0]) * (ja->nr - pos)); 1080 memmove(new_bucket_seq + pos + nr_got, 1081 new_bucket_seq + pos, 1082 sizeof(new_bucket_seq[0]) * (ja->nr - pos)); 1083 1084 for (i = 0; i < nr_got; i++) { 1085 new_buckets[pos + i] = bu[i]; 1086 new_bucket_seq[pos + i] = 0; 1087 } 1088 1089 nr = ja->nr + nr_got; 1090 1091 ret = bch2_journal_buckets_to_sb(c, ca, new_buckets, nr); 1092 if (ret) 1093 goto err_unblock; 1094 1095 bch2_write_super(c); 1096 1097 /* Commit: */ 1098 if (c) 1099 spin_lock(&c->journal.lock); 1100 1101 swap(new_buckets, ja->buckets); 1102 swap(new_bucket_seq, ja->bucket_seq); 1103 ja->nr = nr; 1104 1105 if (pos <= ja->discard_idx) 1106 ja->discard_idx = (ja->discard_idx + nr_got) % ja->nr; 1107 if (pos <= ja->dirty_idx_ondisk) 1108 ja->dirty_idx_ondisk = (ja->dirty_idx_ondisk + nr_got) % ja->nr; 1109 if (pos <= ja->dirty_idx) 1110 ja->dirty_idx = (ja->dirty_idx + nr_got) % ja->nr; 1111 if (pos <= ja->cur_idx) 1112 ja->cur_idx = (ja->cur_idx + nr_got) % ja->nr; 1113 1114 if (c) 1115 spin_unlock(&c->journal.lock); 1116 err_unblock: 1117 if (c) { 1118 bch2_journal_unblock(&c->journal); 1119 mutex_unlock(&c->sb_lock); 1120 } 1121 1122 if (ret && !new_fs) 1123 for (i = 0; i < nr_got; i++) 1124 bch2_trans_run(c, 1125 bch2_trans_mark_metadata_bucket(trans, ca, 1126 bu[i], BCH_DATA_free, 0, 1127 BTREE_TRIGGER_transactional)); 1128 err_free: 1129 for (i = 0; i < nr_got; i++) 1130 bch2_open_bucket_put(c, ob[i]); 1131 1132 kfree(new_bucket_seq); 1133 kfree(new_buckets); 1134 kfree(ob); 1135 kfree(bu); 1136 return ret; 1137 } 1138 1139 /* 1140 * Allocate more journal space at runtime - not currently making use if it, but 1141 * the code works: 1142 */ 1143 int bch2_set_nr_journal_buckets(struct bch_fs *c, struct bch_dev *ca, 1144 unsigned nr) 1145 { 1146 struct journal_device *ja = &ca->journal; 1147 struct closure cl; 1148 int ret = 0; 1149 1150 closure_init_stack(&cl); 1151 1152 down_write(&c->state_lock); 1153 1154 /* don't handle reducing nr of buckets yet: */ 1155 if (nr < ja->nr) 1156 goto unlock; 1157 1158 while (ja->nr < nr) { 1159 struct disk_reservation disk_res = { 0, 0, 0 }; 1160 1161 /* 1162 * note: journal buckets aren't really counted as _sectors_ used yet, so 1163 * we don't need the disk reservation to avoid the BUG_ON() in buckets.c 1164 * when space used goes up without a reservation - but we do need the 1165 * reservation to ensure we'll actually be able to allocate: 1166 * 1167 * XXX: that's not right, disk reservations only ensure a 1168 * filesystem-wide allocation will succeed, this is a device 1169 * specific allocation - we can hang here: 1170 */ 1171 1172 ret = bch2_disk_reservation_get(c, &disk_res, 1173 bucket_to_sector(ca, nr - ja->nr), 1, 0); 1174 if (ret) 1175 break; 1176 1177 ret = __bch2_set_nr_journal_buckets(ca, nr, false, &cl); 1178 1179 bch2_disk_reservation_put(c, &disk_res); 1180 1181 closure_sync(&cl); 1182 1183 if (ret && ret != -BCH_ERR_bucket_alloc_blocked) 1184 break; 1185 } 1186 1187 bch_err_fn(c, ret); 1188 unlock: 1189 up_write(&c->state_lock); 1190 return ret; 1191 } 1192 1193 int bch2_dev_journal_alloc(struct bch_dev *ca, bool new_fs) 1194 { 1195 unsigned nr; 1196 int ret; 1197 1198 if (dynamic_fault("bcachefs:add:journal_alloc")) { 1199 ret = -BCH_ERR_ENOMEM_set_nr_journal_buckets; 1200 goto err; 1201 } 1202 1203 /* 1/128th of the device by default: */ 1204 nr = ca->mi.nbuckets >> 7; 1205 1206 /* 1207 * clamp journal size to 8192 buckets or 8GB (in sectors), whichever 1208 * is smaller: 1209 */ 1210 nr = clamp_t(unsigned, nr, 1211 BCH_JOURNAL_BUCKETS_MIN, 1212 min(1 << 13, 1213 (1 << 24) / ca->mi.bucket_size)); 1214 1215 ret = __bch2_set_nr_journal_buckets(ca, nr, new_fs, NULL); 1216 err: 1217 bch_err_fn(ca, ret); 1218 return ret; 1219 } 1220 1221 int bch2_fs_journal_alloc(struct bch_fs *c) 1222 { 1223 for_each_online_member(c, ca) { 1224 if (ca->journal.nr) 1225 continue; 1226 1227 int ret = bch2_dev_journal_alloc(ca, true); 1228 if (ret) { 1229 percpu_ref_put(&ca->io_ref); 1230 return ret; 1231 } 1232 } 1233 1234 return 0; 1235 } 1236 1237 /* startup/shutdown: */ 1238 1239 static bool bch2_journal_writing_to_device(struct journal *j, unsigned dev_idx) 1240 { 1241 bool ret = false; 1242 u64 seq; 1243 1244 spin_lock(&j->lock); 1245 for (seq = journal_last_unwritten_seq(j); 1246 seq <= journal_cur_seq(j) && !ret; 1247 seq++) { 1248 struct journal_buf *buf = journal_seq_to_buf(j, seq); 1249 1250 if (bch2_bkey_has_device_c(bkey_i_to_s_c(&buf->key), dev_idx)) 1251 ret = true; 1252 } 1253 spin_unlock(&j->lock); 1254 1255 return ret; 1256 } 1257 1258 void bch2_dev_journal_stop(struct journal *j, struct bch_dev *ca) 1259 { 1260 wait_event(j->wait, !bch2_journal_writing_to_device(j, ca->dev_idx)); 1261 } 1262 1263 void bch2_fs_journal_stop(struct journal *j) 1264 { 1265 if (!test_bit(JOURNAL_running, &j->flags)) 1266 return; 1267 1268 bch2_journal_reclaim_stop(j); 1269 bch2_journal_flush_all_pins(j); 1270 1271 wait_event(j->wait, bch2_journal_entry_close(j)); 1272 1273 /* 1274 * Always write a new journal entry, to make sure the clock hands are up 1275 * to date (and match the superblock) 1276 */ 1277 __bch2_journal_meta(j); 1278 1279 journal_quiesce(j); 1280 cancel_delayed_work_sync(&j->write_work); 1281 1282 WARN(!bch2_journal_error(j) && 1283 test_bit(JOURNAL_replay_done, &j->flags) && 1284 j->last_empty_seq != journal_cur_seq(j), 1285 "journal shutdown error: cur seq %llu but last empty seq %llu", 1286 journal_cur_seq(j), j->last_empty_seq); 1287 1288 if (!bch2_journal_error(j)) 1289 clear_bit(JOURNAL_running, &j->flags); 1290 } 1291 1292 int bch2_fs_journal_start(struct journal *j, u64 cur_seq) 1293 { 1294 struct bch_fs *c = container_of(j, struct bch_fs, journal); 1295 struct journal_entry_pin_list *p; 1296 struct journal_replay *i, **_i; 1297 struct genradix_iter iter; 1298 bool had_entries = false; 1299 u64 last_seq = cur_seq, nr, seq; 1300 1301 if (cur_seq >= JOURNAL_SEQ_MAX) { 1302 bch_err(c, "cannot start: journal seq overflow"); 1303 return -EINVAL; 1304 } 1305 1306 genradix_for_each_reverse(&c->journal_entries, iter, _i) { 1307 i = *_i; 1308 1309 if (journal_replay_ignore(i)) 1310 continue; 1311 1312 last_seq = le64_to_cpu(i->j.last_seq); 1313 break; 1314 } 1315 1316 nr = cur_seq - last_seq; 1317 1318 if (nr + 1 > j->pin.size) { 1319 free_fifo(&j->pin); 1320 init_fifo(&j->pin, roundup_pow_of_two(nr + 1), GFP_KERNEL); 1321 if (!j->pin.data) { 1322 bch_err(c, "error reallocating journal fifo (%llu open entries)", nr); 1323 return -BCH_ERR_ENOMEM_journal_pin_fifo; 1324 } 1325 } 1326 1327 j->replay_journal_seq = last_seq; 1328 j->replay_journal_seq_end = cur_seq; 1329 j->last_seq_ondisk = last_seq; 1330 j->flushed_seq_ondisk = cur_seq - 1; 1331 j->seq_ondisk = cur_seq - 1; 1332 j->pin.front = last_seq; 1333 j->pin.back = cur_seq; 1334 atomic64_set(&j->seq, cur_seq - 1); 1335 1336 fifo_for_each_entry_ptr(p, &j->pin, seq) 1337 journal_pin_list_init(p, 1); 1338 1339 genradix_for_each(&c->journal_entries, iter, _i) { 1340 i = *_i; 1341 1342 if (journal_replay_ignore(i)) 1343 continue; 1344 1345 seq = le64_to_cpu(i->j.seq); 1346 BUG_ON(seq >= cur_seq); 1347 1348 if (seq < last_seq) 1349 continue; 1350 1351 if (journal_entry_empty(&i->j)) 1352 j->last_empty_seq = le64_to_cpu(i->j.seq); 1353 1354 p = journal_seq_pin(j, seq); 1355 1356 p->devs.nr = 0; 1357 darray_for_each(i->ptrs, ptr) 1358 bch2_dev_list_add_dev(&p->devs, ptr->dev); 1359 1360 had_entries = true; 1361 } 1362 1363 if (!had_entries) 1364 j->last_empty_seq = cur_seq - 1; /* to match j->seq */ 1365 1366 spin_lock(&j->lock); 1367 1368 set_bit(JOURNAL_running, &j->flags); 1369 j->last_flush_write = jiffies; 1370 1371 j->reservations.idx = j->reservations.unwritten_idx = journal_cur_seq(j); 1372 j->reservations.unwritten_idx++; 1373 1374 c->last_bucket_seq_cleanup = journal_cur_seq(j); 1375 1376 bch2_journal_space_available(j); 1377 spin_unlock(&j->lock); 1378 1379 return bch2_journal_reclaim_start(j); 1380 } 1381 1382 /* init/exit: */ 1383 1384 void bch2_dev_journal_exit(struct bch_dev *ca) 1385 { 1386 struct journal_device *ja = &ca->journal; 1387 1388 for (unsigned i = 0; i < ARRAY_SIZE(ja->bio); i++) { 1389 kfree(ja->bio[i]); 1390 ja->bio[i] = NULL; 1391 } 1392 1393 kfree(ja->buckets); 1394 kfree(ja->bucket_seq); 1395 ja->buckets = NULL; 1396 ja->bucket_seq = NULL; 1397 } 1398 1399 int bch2_dev_journal_init(struct bch_dev *ca, struct bch_sb *sb) 1400 { 1401 struct journal_device *ja = &ca->journal; 1402 struct bch_sb_field_journal *journal_buckets = 1403 bch2_sb_field_get(sb, journal); 1404 struct bch_sb_field_journal_v2 *journal_buckets_v2 = 1405 bch2_sb_field_get(sb, journal_v2); 1406 1407 ja->nr = 0; 1408 1409 if (journal_buckets_v2) { 1410 unsigned nr = bch2_sb_field_journal_v2_nr_entries(journal_buckets_v2); 1411 1412 for (unsigned i = 0; i < nr; i++) 1413 ja->nr += le64_to_cpu(journal_buckets_v2->d[i].nr); 1414 } else if (journal_buckets) { 1415 ja->nr = bch2_nr_journal_buckets(journal_buckets); 1416 } 1417 1418 ja->bucket_seq = kcalloc(ja->nr, sizeof(u64), GFP_KERNEL); 1419 if (!ja->bucket_seq) 1420 return -BCH_ERR_ENOMEM_dev_journal_init; 1421 1422 unsigned nr_bvecs = DIV_ROUND_UP(JOURNAL_ENTRY_SIZE_MAX, PAGE_SIZE); 1423 1424 for (unsigned i = 0; i < ARRAY_SIZE(ja->bio); i++) { 1425 ja->bio[i] = kmalloc(struct_size(ja->bio[i], bio.bi_inline_vecs, 1426 nr_bvecs), GFP_KERNEL); 1427 if (!ja->bio[i]) 1428 return -BCH_ERR_ENOMEM_dev_journal_init; 1429 1430 ja->bio[i]->ca = ca; 1431 ja->bio[i]->buf_idx = i; 1432 bio_init(&ja->bio[i]->bio, NULL, ja->bio[i]->bio.bi_inline_vecs, nr_bvecs, 0); 1433 } 1434 1435 ja->buckets = kcalloc(ja->nr, sizeof(u64), GFP_KERNEL); 1436 if (!ja->buckets) 1437 return -BCH_ERR_ENOMEM_dev_journal_init; 1438 1439 if (journal_buckets_v2) { 1440 unsigned nr = bch2_sb_field_journal_v2_nr_entries(journal_buckets_v2); 1441 unsigned dst = 0; 1442 1443 for (unsigned i = 0; i < nr; i++) 1444 for (unsigned j = 0; j < le64_to_cpu(journal_buckets_v2->d[i].nr); j++) 1445 ja->buckets[dst++] = 1446 le64_to_cpu(journal_buckets_v2->d[i].start) + j; 1447 } else if (journal_buckets) { 1448 for (unsigned i = 0; i < ja->nr; i++) 1449 ja->buckets[i] = le64_to_cpu(journal_buckets->buckets[i]); 1450 } 1451 1452 return 0; 1453 } 1454 1455 void bch2_fs_journal_exit(struct journal *j) 1456 { 1457 if (j->wq) 1458 destroy_workqueue(j->wq); 1459 1460 darray_exit(&j->early_journal_entries); 1461 1462 for (unsigned i = 0; i < ARRAY_SIZE(j->buf); i++) 1463 kvfree(j->buf[i].data); 1464 free_fifo(&j->pin); 1465 } 1466 1467 int bch2_fs_journal_init(struct journal *j) 1468 { 1469 static struct lock_class_key res_key; 1470 1471 mutex_init(&j->buf_lock); 1472 spin_lock_init(&j->lock); 1473 spin_lock_init(&j->err_lock); 1474 init_waitqueue_head(&j->wait); 1475 INIT_DELAYED_WORK(&j->write_work, journal_write_work); 1476 init_waitqueue_head(&j->reclaim_wait); 1477 init_waitqueue_head(&j->pin_flush_wait); 1478 mutex_init(&j->reclaim_lock); 1479 mutex_init(&j->discard_lock); 1480 1481 lockdep_init_map(&j->res_map, "journal res", &res_key, 0); 1482 1483 atomic64_set(&j->reservations.counter, 1484 ((union journal_res_state) 1485 { .cur_entry_offset = JOURNAL_ENTRY_CLOSED_VAL }).v); 1486 1487 if (!(init_fifo(&j->pin, JOURNAL_PIN, GFP_KERNEL))) 1488 return -BCH_ERR_ENOMEM_journal_pin_fifo; 1489 1490 for (unsigned i = 0; i < ARRAY_SIZE(j->buf); i++) { 1491 j->buf[i].buf_size = JOURNAL_ENTRY_SIZE_MIN; 1492 j->buf[i].data = kvmalloc(j->buf[i].buf_size, GFP_KERNEL); 1493 if (!j->buf[i].data) 1494 return -BCH_ERR_ENOMEM_journal_buf; 1495 j->buf[i].idx = i; 1496 } 1497 1498 j->pin.front = j->pin.back = 1; 1499 1500 j->wq = alloc_workqueue("bcachefs_journal", 1501 WQ_HIGHPRI|WQ_FREEZABLE|WQ_UNBOUND|WQ_MEM_RECLAIM, 512); 1502 if (!j->wq) 1503 return -BCH_ERR_ENOMEM_fs_other_alloc; 1504 return 0; 1505 } 1506 1507 /* debug: */ 1508 1509 static const char * const bch2_journal_flags_strs[] = { 1510 #define x(n) #n, 1511 JOURNAL_FLAGS() 1512 #undef x 1513 NULL 1514 }; 1515 1516 void __bch2_journal_debug_to_text(struct printbuf *out, struct journal *j) 1517 { 1518 struct bch_fs *c = container_of(j, struct bch_fs, journal); 1519 union journal_res_state s; 1520 unsigned long now = jiffies; 1521 u64 nr_writes = j->nr_flush_writes + j->nr_noflush_writes; 1522 1523 printbuf_tabstops_reset(out); 1524 printbuf_tabstop_push(out, 28); 1525 out->atomic++; 1526 1527 rcu_read_lock(); 1528 s = READ_ONCE(j->reservations); 1529 1530 prt_printf(out, "flags:\t"); 1531 prt_bitflags(out, bch2_journal_flags_strs, j->flags); 1532 prt_newline(out); 1533 prt_printf(out, "dirty journal entries:\t%llu/%llu\n", fifo_used(&j->pin), j->pin.size); 1534 prt_printf(out, "seq:\t%llu\n", journal_cur_seq(j)); 1535 prt_printf(out, "seq_ondisk:\t%llu\n", j->seq_ondisk); 1536 prt_printf(out, "last_seq:\t%llu\n", journal_last_seq(j)); 1537 prt_printf(out, "last_seq_ondisk:\t%llu\n", j->last_seq_ondisk); 1538 prt_printf(out, "flushed_seq_ondisk:\t%llu\n", j->flushed_seq_ondisk); 1539 prt_printf(out, "watermark:\t%s\n", bch2_watermarks[j->watermark]); 1540 prt_printf(out, "each entry reserved:\t%u\n", j->entry_u64s_reserved); 1541 prt_printf(out, "nr flush writes:\t%llu\n", j->nr_flush_writes); 1542 prt_printf(out, "nr noflush writes:\t%llu\n", j->nr_noflush_writes); 1543 prt_printf(out, "average write size:\t"); 1544 prt_human_readable_u64(out, nr_writes ? div64_u64(j->entry_bytes_written, nr_writes) : 0); 1545 prt_newline(out); 1546 prt_printf(out, "nr direct reclaim:\t%llu\n", j->nr_direct_reclaim); 1547 prt_printf(out, "nr background reclaim:\t%llu\n", j->nr_background_reclaim); 1548 prt_printf(out, "reclaim kicked:\t%u\n", j->reclaim_kicked); 1549 prt_printf(out, "reclaim runs in:\t%u ms\n", time_after(j->next_reclaim, now) 1550 ? jiffies_to_msecs(j->next_reclaim - jiffies) : 0); 1551 prt_printf(out, "blocked:\t%u\n", j->blocked); 1552 prt_printf(out, "current entry sectors:\t%u\n", j->cur_entry_sectors); 1553 prt_printf(out, "current entry error:\t%s\n", bch2_journal_errors[j->cur_entry_error]); 1554 prt_printf(out, "current entry:\t"); 1555 1556 switch (s.cur_entry_offset) { 1557 case JOURNAL_ENTRY_ERROR_VAL: 1558 prt_printf(out, "error\n"); 1559 break; 1560 case JOURNAL_ENTRY_CLOSED_VAL: 1561 prt_printf(out, "closed\n"); 1562 break; 1563 case JOURNAL_ENTRY_BLOCKED_VAL: 1564 prt_printf(out, "blocked\n"); 1565 break; 1566 default: 1567 prt_printf(out, "%u/%u\n", s.cur_entry_offset, j->cur_entry_u64s); 1568 break; 1569 } 1570 1571 prt_printf(out, "unwritten entries:\n"); 1572 bch2_journal_bufs_to_text(out, j); 1573 1574 prt_printf(out, "space:\n"); 1575 printbuf_indent_add(out, 2); 1576 prt_printf(out, "discarded\t%u:%u\n", 1577 j->space[journal_space_discarded].next_entry, 1578 j->space[journal_space_discarded].total); 1579 prt_printf(out, "clean ondisk\t%u:%u\n", 1580 j->space[journal_space_clean_ondisk].next_entry, 1581 j->space[journal_space_clean_ondisk].total); 1582 prt_printf(out, "clean\t%u:%u\n", 1583 j->space[journal_space_clean].next_entry, 1584 j->space[journal_space_clean].total); 1585 prt_printf(out, "total\t%u:%u\n", 1586 j->space[journal_space_total].next_entry, 1587 j->space[journal_space_total].total); 1588 printbuf_indent_sub(out, 2); 1589 1590 for_each_member_device_rcu(c, ca, &c->rw_devs[BCH_DATA_journal]) { 1591 if (!ca->mi.durability) 1592 continue; 1593 1594 struct journal_device *ja = &ca->journal; 1595 1596 if (!test_bit(ca->dev_idx, c->rw_devs[BCH_DATA_journal].d)) 1597 continue; 1598 1599 if (!ja->nr) 1600 continue; 1601 1602 prt_printf(out, "dev %u:\n", ca->dev_idx); 1603 prt_printf(out, "durability %u:\n", ca->mi.durability); 1604 printbuf_indent_add(out, 2); 1605 prt_printf(out, "nr\t%u\n", ja->nr); 1606 prt_printf(out, "bucket size\t%u\n", ca->mi.bucket_size); 1607 prt_printf(out, "available\t%u:%u\n", bch2_journal_dev_buckets_available(j, ja, journal_space_discarded), ja->sectors_free); 1608 prt_printf(out, "discard_idx\t%u\n", ja->discard_idx); 1609 prt_printf(out, "dirty_ondisk\t%u (seq %llu)\n",ja->dirty_idx_ondisk, ja->bucket_seq[ja->dirty_idx_ondisk]); 1610 prt_printf(out, "dirty_idx\t%u (seq %llu)\n", ja->dirty_idx, ja->bucket_seq[ja->dirty_idx]); 1611 prt_printf(out, "cur_idx\t%u (seq %llu)\n", ja->cur_idx, ja->bucket_seq[ja->cur_idx]); 1612 printbuf_indent_sub(out, 2); 1613 } 1614 1615 prt_printf(out, "replicas want %u need %u\n", c->opts.metadata_replicas, c->opts.metadata_replicas_required); 1616 1617 rcu_read_unlock(); 1618 1619 --out->atomic; 1620 } 1621 1622 void bch2_journal_debug_to_text(struct printbuf *out, struct journal *j) 1623 { 1624 spin_lock(&j->lock); 1625 __bch2_journal_debug_to_text(out, j); 1626 spin_unlock(&j->lock); 1627 } 1628