1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * bcachefs setup/teardown code, and some metadata io - read a superblock and 4 * figure out what to do with it. 5 * 6 * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com> 7 * Copyright 2012 Google, Inc. 8 */ 9 10 #include "bcachefs.h" 11 #include "alloc_background.h" 12 #include "alloc_foreground.h" 13 #include "bkey_sort.h" 14 #include "btree_cache.h" 15 #include "btree_gc.h" 16 #include "btree_journal_iter.h" 17 #include "btree_key_cache.h" 18 #include "btree_update_interior.h" 19 #include "btree_io.h" 20 #include "btree_write_buffer.h" 21 #include "buckets_waiting_for_journal.h" 22 #include "chardev.h" 23 #include "checksum.h" 24 #include "clock.h" 25 #include "compress.h" 26 #include "debug.h" 27 #include "disk_groups.h" 28 #include "ec.h" 29 #include "errcode.h" 30 #include "error.h" 31 #include "fs.h" 32 #include "fs-io.h" 33 #include "fs-io-buffered.h" 34 #include "fs-io-direct.h" 35 #include "fsck.h" 36 #include "inode.h" 37 #include "io_read.h" 38 #include "io_write.h" 39 #include "journal.h" 40 #include "journal_reclaim.h" 41 #include "journal_seq_blacklist.h" 42 #include "move.h" 43 #include "migrate.h" 44 #include "movinggc.h" 45 #include "nocow_locking.h" 46 #include "quota.h" 47 #include "rebalance.h" 48 #include "recovery.h" 49 #include "replicas.h" 50 #include "sb-clean.h" 51 #include "sb-counters.h" 52 #include "sb-errors.h" 53 #include "sb-members.h" 54 #include "snapshot.h" 55 #include "subvolume.h" 56 #include "super.h" 57 #include "super-io.h" 58 #include "sysfs.h" 59 #include "trace.h" 60 61 #include <linux/backing-dev.h> 62 #include <linux/blkdev.h> 63 #include <linux/debugfs.h> 64 #include <linux/device.h> 65 #include <linux/idr.h> 66 #include <linux/module.h> 67 #include <linux/percpu.h> 68 #include <linux/random.h> 69 #include <linux/sysfs.h> 70 #include <crypto/hash.h> 71 72 MODULE_LICENSE("GPL"); 73 MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>"); 74 MODULE_DESCRIPTION("bcachefs filesystem"); 75 MODULE_SOFTDEP("pre: crc32c"); 76 MODULE_SOFTDEP("pre: crc64"); 77 MODULE_SOFTDEP("pre: sha256"); 78 MODULE_SOFTDEP("pre: chacha20"); 79 MODULE_SOFTDEP("pre: poly1305"); 80 MODULE_SOFTDEP("pre: xxhash"); 81 82 const char * const bch2_fs_flag_strs[] = { 83 #define x(n) #n, 84 BCH_FS_FLAGS() 85 #undef x 86 NULL 87 }; 88 89 void __bch2_print(struct bch_fs *c, const char *fmt, ...) 90 { 91 struct stdio_redirect *stdio = bch2_fs_stdio_redirect(c); 92 93 va_list args; 94 va_start(args, fmt); 95 if (likely(!stdio)) { 96 vprintk(fmt, args); 97 } else { 98 unsigned long flags; 99 100 if (fmt[0] == KERN_SOH[0]) 101 fmt += 2; 102 103 spin_lock_irqsave(&stdio->output_lock, flags); 104 prt_vprintf(&stdio->output_buf, fmt, args); 105 spin_unlock_irqrestore(&stdio->output_lock, flags); 106 107 wake_up(&stdio->output_wait); 108 } 109 va_end(args); 110 } 111 112 #define KTYPE(type) \ 113 static const struct attribute_group type ## _group = { \ 114 .attrs = type ## _files \ 115 }; \ 116 \ 117 static const struct attribute_group *type ## _groups[] = { \ 118 &type ## _group, \ 119 NULL \ 120 }; \ 121 \ 122 static const struct kobj_type type ## _ktype = { \ 123 .release = type ## _release, \ 124 .sysfs_ops = &type ## _sysfs_ops, \ 125 .default_groups = type ## _groups \ 126 } 127 128 static void bch2_fs_release(struct kobject *); 129 static void bch2_dev_release(struct kobject *); 130 static void bch2_fs_counters_release(struct kobject *k) 131 { 132 } 133 134 static void bch2_fs_internal_release(struct kobject *k) 135 { 136 } 137 138 static void bch2_fs_opts_dir_release(struct kobject *k) 139 { 140 } 141 142 static void bch2_fs_time_stats_release(struct kobject *k) 143 { 144 } 145 146 KTYPE(bch2_fs); 147 KTYPE(bch2_fs_counters); 148 KTYPE(bch2_fs_internal); 149 KTYPE(bch2_fs_opts_dir); 150 KTYPE(bch2_fs_time_stats); 151 KTYPE(bch2_dev); 152 153 static struct kset *bcachefs_kset; 154 static LIST_HEAD(bch_fs_list); 155 static DEFINE_MUTEX(bch_fs_list_lock); 156 157 DECLARE_WAIT_QUEUE_HEAD(bch2_read_only_wait); 158 159 static void bch2_dev_free(struct bch_dev *); 160 static int bch2_dev_alloc(struct bch_fs *, unsigned); 161 static int bch2_dev_sysfs_online(struct bch_fs *, struct bch_dev *); 162 static void __bch2_dev_read_only(struct bch_fs *, struct bch_dev *); 163 164 struct bch_fs *bch2_dev_to_fs(dev_t dev) 165 { 166 struct bch_fs *c; 167 168 mutex_lock(&bch_fs_list_lock); 169 rcu_read_lock(); 170 171 list_for_each_entry(c, &bch_fs_list, list) 172 for_each_member_device_rcu(c, ca, NULL) 173 if (ca->disk_sb.bdev && ca->disk_sb.bdev->bd_dev == dev) { 174 closure_get(&c->cl); 175 goto found; 176 } 177 c = NULL; 178 found: 179 rcu_read_unlock(); 180 mutex_unlock(&bch_fs_list_lock); 181 182 return c; 183 } 184 185 static struct bch_fs *__bch2_uuid_to_fs(__uuid_t uuid) 186 { 187 struct bch_fs *c; 188 189 lockdep_assert_held(&bch_fs_list_lock); 190 191 list_for_each_entry(c, &bch_fs_list, list) 192 if (!memcmp(&c->disk_sb.sb->uuid, &uuid, sizeof(uuid))) 193 return c; 194 195 return NULL; 196 } 197 198 struct bch_fs *bch2_uuid_to_fs(__uuid_t uuid) 199 { 200 struct bch_fs *c; 201 202 mutex_lock(&bch_fs_list_lock); 203 c = __bch2_uuid_to_fs(uuid); 204 if (c) 205 closure_get(&c->cl); 206 mutex_unlock(&bch_fs_list_lock); 207 208 return c; 209 } 210 211 static void bch2_dev_usage_journal_reserve(struct bch_fs *c) 212 { 213 unsigned nr = 0, u64s = 214 ((sizeof(struct jset_entry_dev_usage) + 215 sizeof(struct jset_entry_dev_usage_type) * BCH_DATA_NR)) / 216 sizeof(u64); 217 218 rcu_read_lock(); 219 for_each_member_device_rcu(c, ca, NULL) 220 nr++; 221 rcu_read_unlock(); 222 223 bch2_journal_entry_res_resize(&c->journal, 224 &c->dev_usage_journal_res, u64s * nr); 225 } 226 227 /* Filesystem RO/RW: */ 228 229 /* 230 * For startup/shutdown of RW stuff, the dependencies are: 231 * 232 * - foreground writes depend on copygc and rebalance (to free up space) 233 * 234 * - copygc and rebalance depend on mark and sweep gc (they actually probably 235 * don't because they either reserve ahead of time or don't block if 236 * allocations fail, but allocations can require mark and sweep gc to run 237 * because of generation number wraparound) 238 * 239 * - all of the above depends on the allocator threads 240 * 241 * - allocator depends on the journal (when it rewrites prios and gens) 242 */ 243 244 static void __bch2_fs_read_only(struct bch_fs *c) 245 { 246 unsigned clean_passes = 0; 247 u64 seq = 0; 248 249 bch2_fs_ec_stop(c); 250 bch2_open_buckets_stop(c, NULL, true); 251 bch2_rebalance_stop(c); 252 bch2_copygc_stop(c); 253 bch2_gc_thread_stop(c); 254 bch2_fs_ec_flush(c); 255 256 bch_verbose(c, "flushing journal and stopping allocators, journal seq %llu", 257 journal_cur_seq(&c->journal)); 258 259 do { 260 clean_passes++; 261 262 if (bch2_btree_interior_updates_flush(c) || 263 bch2_journal_flush_all_pins(&c->journal) || 264 bch2_btree_flush_all_writes(c) || 265 seq != atomic64_read(&c->journal.seq)) { 266 seq = atomic64_read(&c->journal.seq); 267 clean_passes = 0; 268 } 269 } while (clean_passes < 2); 270 271 bch_verbose(c, "flushing journal and stopping allocators complete, journal seq %llu", 272 journal_cur_seq(&c->journal)); 273 274 if (test_bit(JOURNAL_REPLAY_DONE, &c->journal.flags) && 275 !test_bit(BCH_FS_emergency_ro, &c->flags)) 276 set_bit(BCH_FS_clean_shutdown, &c->flags); 277 bch2_fs_journal_stop(&c->journal); 278 279 /* 280 * After stopping journal: 281 */ 282 for_each_member_device(c, ca) 283 bch2_dev_allocator_remove(c, ca); 284 } 285 286 #ifndef BCH_WRITE_REF_DEBUG 287 static void bch2_writes_disabled(struct percpu_ref *writes) 288 { 289 struct bch_fs *c = container_of(writes, struct bch_fs, writes); 290 291 set_bit(BCH_FS_write_disable_complete, &c->flags); 292 wake_up(&bch2_read_only_wait); 293 } 294 #endif 295 296 void bch2_fs_read_only(struct bch_fs *c) 297 { 298 if (!test_bit(BCH_FS_rw, &c->flags)) { 299 bch2_journal_reclaim_stop(&c->journal); 300 return; 301 } 302 303 BUG_ON(test_bit(BCH_FS_write_disable_complete, &c->flags)); 304 305 bch_verbose(c, "going read-only"); 306 307 /* 308 * Block new foreground-end write operations from starting - any new 309 * writes will return -EROFS: 310 */ 311 set_bit(BCH_FS_going_ro, &c->flags); 312 #ifndef BCH_WRITE_REF_DEBUG 313 percpu_ref_kill(&c->writes); 314 #else 315 for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++) 316 bch2_write_ref_put(c, i); 317 #endif 318 319 /* 320 * If we're not doing an emergency shutdown, we want to wait on 321 * outstanding writes to complete so they don't see spurious errors due 322 * to shutting down the allocator: 323 * 324 * If we are doing an emergency shutdown outstanding writes may 325 * hang until we shutdown the allocator so we don't want to wait 326 * on outstanding writes before shutting everything down - but 327 * we do need to wait on them before returning and signalling 328 * that going RO is complete: 329 */ 330 wait_event(bch2_read_only_wait, 331 test_bit(BCH_FS_write_disable_complete, &c->flags) || 332 test_bit(BCH_FS_emergency_ro, &c->flags)); 333 334 bool writes_disabled = test_bit(BCH_FS_write_disable_complete, &c->flags); 335 if (writes_disabled) 336 bch_verbose(c, "finished waiting for writes to stop"); 337 338 __bch2_fs_read_only(c); 339 340 wait_event(bch2_read_only_wait, 341 test_bit(BCH_FS_write_disable_complete, &c->flags)); 342 343 if (!writes_disabled) 344 bch_verbose(c, "finished waiting for writes to stop"); 345 346 clear_bit(BCH_FS_write_disable_complete, &c->flags); 347 clear_bit(BCH_FS_going_ro, &c->flags); 348 clear_bit(BCH_FS_rw, &c->flags); 349 350 if (!bch2_journal_error(&c->journal) && 351 !test_bit(BCH_FS_error, &c->flags) && 352 !test_bit(BCH_FS_emergency_ro, &c->flags) && 353 test_bit(BCH_FS_started, &c->flags) && 354 test_bit(BCH_FS_clean_shutdown, &c->flags) && 355 !c->opts.norecovery) { 356 BUG_ON(c->journal.last_empty_seq != journal_cur_seq(&c->journal)); 357 BUG_ON(atomic_read(&c->btree_cache.dirty)); 358 BUG_ON(atomic_long_read(&c->btree_key_cache.nr_dirty)); 359 BUG_ON(c->btree_write_buffer.inc.keys.nr); 360 BUG_ON(c->btree_write_buffer.flushing.keys.nr); 361 362 bch_verbose(c, "marking filesystem clean"); 363 bch2_fs_mark_clean(c); 364 } else { 365 bch_verbose(c, "done going read-only, filesystem not clean"); 366 } 367 } 368 369 static void bch2_fs_read_only_work(struct work_struct *work) 370 { 371 struct bch_fs *c = 372 container_of(work, struct bch_fs, read_only_work); 373 374 down_write(&c->state_lock); 375 bch2_fs_read_only(c); 376 up_write(&c->state_lock); 377 } 378 379 static void bch2_fs_read_only_async(struct bch_fs *c) 380 { 381 queue_work(system_long_wq, &c->read_only_work); 382 } 383 384 bool bch2_fs_emergency_read_only(struct bch_fs *c) 385 { 386 bool ret = !test_and_set_bit(BCH_FS_emergency_ro, &c->flags); 387 388 bch2_journal_halt(&c->journal); 389 bch2_fs_read_only_async(c); 390 391 wake_up(&bch2_read_only_wait); 392 return ret; 393 } 394 395 static int bch2_fs_read_write_late(struct bch_fs *c) 396 { 397 int ret; 398 399 /* 400 * Data move operations can't run until after check_snapshots has 401 * completed, and bch2_snapshot_is_ancestor() is available. 402 * 403 * Ideally we'd start copygc/rebalance earlier instead of waiting for 404 * all of recovery/fsck to complete: 405 */ 406 ret = bch2_copygc_start(c); 407 if (ret) { 408 bch_err(c, "error starting copygc thread"); 409 return ret; 410 } 411 412 ret = bch2_rebalance_start(c); 413 if (ret) { 414 bch_err(c, "error starting rebalance thread"); 415 return ret; 416 } 417 418 return 0; 419 } 420 421 static int __bch2_fs_read_write(struct bch_fs *c, bool early) 422 { 423 int ret; 424 425 if (test_bit(BCH_FS_initial_gc_unfixed, &c->flags)) { 426 bch_err(c, "cannot go rw, unfixed btree errors"); 427 return -BCH_ERR_erofs_unfixed_errors; 428 } 429 430 if (test_bit(BCH_FS_rw, &c->flags)) 431 return 0; 432 433 bch_info(c, "going read-write"); 434 435 ret = bch2_sb_members_v2_init(c); 436 if (ret) 437 goto err; 438 439 ret = bch2_fs_mark_dirty(c); 440 if (ret) 441 goto err; 442 443 clear_bit(BCH_FS_clean_shutdown, &c->flags); 444 445 /* 446 * First journal write must be a flush write: after a clean shutdown we 447 * don't read the journal, so the first journal write may end up 448 * overwriting whatever was there previously, and there must always be 449 * at least one non-flush write in the journal or recovery will fail: 450 */ 451 set_bit(JOURNAL_NEED_FLUSH_WRITE, &c->journal.flags); 452 453 for_each_rw_member(c, ca) 454 bch2_dev_allocator_add(c, ca); 455 bch2_recalc_capacity(c); 456 457 set_bit(BCH_FS_rw, &c->flags); 458 set_bit(BCH_FS_was_rw, &c->flags); 459 460 #ifndef BCH_WRITE_REF_DEBUG 461 percpu_ref_reinit(&c->writes); 462 #else 463 for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++) { 464 BUG_ON(atomic_long_read(&c->writes[i])); 465 atomic_long_inc(&c->writes[i]); 466 } 467 #endif 468 469 ret = bch2_gc_thread_start(c); 470 if (ret) { 471 bch_err(c, "error starting gc thread"); 472 return ret; 473 } 474 475 ret = bch2_journal_reclaim_start(&c->journal); 476 if (ret) 477 goto err; 478 479 if (!early) { 480 ret = bch2_fs_read_write_late(c); 481 if (ret) 482 goto err; 483 } 484 485 bch2_do_discards(c); 486 bch2_do_invalidates(c); 487 bch2_do_stripe_deletes(c); 488 bch2_do_pending_node_rewrites(c); 489 return 0; 490 err: 491 if (test_bit(BCH_FS_rw, &c->flags)) 492 bch2_fs_read_only(c); 493 else 494 __bch2_fs_read_only(c); 495 return ret; 496 } 497 498 int bch2_fs_read_write(struct bch_fs *c) 499 { 500 if (c->opts.norecovery) 501 return -BCH_ERR_erofs_norecovery; 502 503 if (c->opts.nochanges) 504 return -BCH_ERR_erofs_nochanges; 505 506 return __bch2_fs_read_write(c, false); 507 } 508 509 int bch2_fs_read_write_early(struct bch_fs *c) 510 { 511 lockdep_assert_held(&c->state_lock); 512 513 return __bch2_fs_read_write(c, true); 514 } 515 516 /* Filesystem startup/shutdown: */ 517 518 static void __bch2_fs_free(struct bch_fs *c) 519 { 520 unsigned i; 521 522 for (i = 0; i < BCH_TIME_STAT_NR; i++) 523 bch2_time_stats_exit(&c->times[i]); 524 525 bch2_free_pending_node_rewrites(c); 526 bch2_fs_sb_errors_exit(c); 527 bch2_fs_counters_exit(c); 528 bch2_fs_snapshots_exit(c); 529 bch2_fs_quota_exit(c); 530 bch2_fs_fs_io_direct_exit(c); 531 bch2_fs_fs_io_buffered_exit(c); 532 bch2_fs_fsio_exit(c); 533 bch2_fs_ec_exit(c); 534 bch2_fs_encryption_exit(c); 535 bch2_fs_nocow_locking_exit(c); 536 bch2_fs_io_write_exit(c); 537 bch2_fs_io_read_exit(c); 538 bch2_fs_buckets_waiting_for_journal_exit(c); 539 bch2_fs_btree_interior_update_exit(c); 540 bch2_fs_btree_iter_exit(c); 541 bch2_fs_btree_key_cache_exit(&c->btree_key_cache); 542 bch2_fs_btree_cache_exit(c); 543 bch2_fs_replicas_exit(c); 544 bch2_fs_journal_exit(&c->journal); 545 bch2_io_clock_exit(&c->io_clock[WRITE]); 546 bch2_io_clock_exit(&c->io_clock[READ]); 547 bch2_fs_compress_exit(c); 548 bch2_journal_keys_put_initial(c); 549 BUG_ON(atomic_read(&c->journal_keys.ref)); 550 bch2_fs_btree_write_buffer_exit(c); 551 percpu_free_rwsem(&c->mark_lock); 552 free_percpu(c->online_reserved); 553 554 darray_exit(&c->btree_roots_extra); 555 free_percpu(c->pcpu); 556 mempool_exit(&c->large_bkey_pool); 557 mempool_exit(&c->btree_bounce_pool); 558 bioset_exit(&c->btree_bio); 559 mempool_exit(&c->fill_iter); 560 #ifndef BCH_WRITE_REF_DEBUG 561 percpu_ref_exit(&c->writes); 562 #endif 563 kfree(rcu_dereference_protected(c->disk_groups, 1)); 564 kfree(c->journal_seq_blacklist_table); 565 kfree(c->unused_inode_hints); 566 567 if (c->write_ref_wq) 568 destroy_workqueue(c->write_ref_wq); 569 if (c->io_complete_wq) 570 destroy_workqueue(c->io_complete_wq); 571 if (c->copygc_wq) 572 destroy_workqueue(c->copygc_wq); 573 if (c->btree_io_complete_wq) 574 destroy_workqueue(c->btree_io_complete_wq); 575 if (c->btree_update_wq) 576 destroy_workqueue(c->btree_update_wq); 577 578 bch2_free_super(&c->disk_sb); 579 kvpfree(c, sizeof(*c)); 580 module_put(THIS_MODULE); 581 } 582 583 static void bch2_fs_release(struct kobject *kobj) 584 { 585 struct bch_fs *c = container_of(kobj, struct bch_fs, kobj); 586 587 __bch2_fs_free(c); 588 } 589 590 void __bch2_fs_stop(struct bch_fs *c) 591 { 592 bch_verbose(c, "shutting down"); 593 594 set_bit(BCH_FS_stopping, &c->flags); 595 596 cancel_work_sync(&c->journal_seq_blacklist_gc_work); 597 598 down_write(&c->state_lock); 599 bch2_fs_read_only(c); 600 up_write(&c->state_lock); 601 602 for_each_member_device(c, ca) 603 if (ca->kobj.state_in_sysfs && 604 ca->disk_sb.bdev) 605 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs"); 606 607 if (c->kobj.state_in_sysfs) 608 kobject_del(&c->kobj); 609 610 bch2_fs_debug_exit(c); 611 bch2_fs_chardev_exit(c); 612 613 bch2_ro_ref_put(c); 614 wait_event(c->ro_ref_wait, !refcount_read(&c->ro_ref)); 615 616 kobject_put(&c->counters_kobj); 617 kobject_put(&c->time_stats); 618 kobject_put(&c->opts_dir); 619 kobject_put(&c->internal); 620 621 /* btree prefetch might have kicked off reads in the background: */ 622 bch2_btree_flush_all_reads(c); 623 624 for_each_member_device(c, ca) 625 cancel_work_sync(&ca->io_error_work); 626 627 cancel_work_sync(&c->read_only_work); 628 } 629 630 void bch2_fs_free(struct bch_fs *c) 631 { 632 unsigned i; 633 634 mutex_lock(&bch_fs_list_lock); 635 list_del(&c->list); 636 mutex_unlock(&bch_fs_list_lock); 637 638 closure_sync(&c->cl); 639 closure_debug_destroy(&c->cl); 640 641 for (i = 0; i < c->sb.nr_devices; i++) { 642 struct bch_dev *ca = rcu_dereference_protected(c->devs[i], true); 643 644 if (ca) { 645 bch2_free_super(&ca->disk_sb); 646 bch2_dev_free(ca); 647 } 648 } 649 650 bch_verbose(c, "shutdown complete"); 651 652 kobject_put(&c->kobj); 653 } 654 655 void bch2_fs_stop(struct bch_fs *c) 656 { 657 __bch2_fs_stop(c); 658 bch2_fs_free(c); 659 } 660 661 static int bch2_fs_online(struct bch_fs *c) 662 { 663 int ret = 0; 664 665 lockdep_assert_held(&bch_fs_list_lock); 666 667 if (__bch2_uuid_to_fs(c->sb.uuid)) { 668 bch_err(c, "filesystem UUID already open"); 669 return -EINVAL; 670 } 671 672 ret = bch2_fs_chardev_init(c); 673 if (ret) { 674 bch_err(c, "error creating character device"); 675 return ret; 676 } 677 678 bch2_fs_debug_init(c); 679 680 ret = kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) ?: 681 kobject_add(&c->internal, &c->kobj, "internal") ?: 682 kobject_add(&c->opts_dir, &c->kobj, "options") ?: 683 #ifndef CONFIG_BCACHEFS_NO_LATENCY_ACCT 684 kobject_add(&c->time_stats, &c->kobj, "time_stats") ?: 685 #endif 686 kobject_add(&c->counters_kobj, &c->kobj, "counters") ?: 687 bch2_opts_create_sysfs_files(&c->opts_dir); 688 if (ret) { 689 bch_err(c, "error creating sysfs objects"); 690 return ret; 691 } 692 693 down_write(&c->state_lock); 694 695 for_each_member_device(c, ca) { 696 ret = bch2_dev_sysfs_online(c, ca); 697 if (ret) { 698 bch_err(c, "error creating sysfs objects"); 699 percpu_ref_put(&ca->ref); 700 goto err; 701 } 702 } 703 704 BUG_ON(!list_empty(&c->list)); 705 list_add(&c->list, &bch_fs_list); 706 err: 707 up_write(&c->state_lock); 708 return ret; 709 } 710 711 static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts) 712 { 713 struct bch_fs *c; 714 struct printbuf name = PRINTBUF; 715 unsigned i, iter_size; 716 int ret = 0; 717 718 c = kvpmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO); 719 if (!c) { 720 c = ERR_PTR(-BCH_ERR_ENOMEM_fs_alloc); 721 goto out; 722 } 723 724 c->stdio = (void *)(unsigned long) opts.stdio; 725 726 __module_get(THIS_MODULE); 727 728 closure_init(&c->cl, NULL); 729 730 c->kobj.kset = bcachefs_kset; 731 kobject_init(&c->kobj, &bch2_fs_ktype); 732 kobject_init(&c->internal, &bch2_fs_internal_ktype); 733 kobject_init(&c->opts_dir, &bch2_fs_opts_dir_ktype); 734 kobject_init(&c->time_stats, &bch2_fs_time_stats_ktype); 735 kobject_init(&c->counters_kobj, &bch2_fs_counters_ktype); 736 737 c->minor = -1; 738 c->disk_sb.fs_sb = true; 739 740 init_rwsem(&c->state_lock); 741 mutex_init(&c->sb_lock); 742 mutex_init(&c->replicas_gc_lock); 743 mutex_init(&c->btree_root_lock); 744 INIT_WORK(&c->read_only_work, bch2_fs_read_only_work); 745 746 refcount_set(&c->ro_ref, 1); 747 init_waitqueue_head(&c->ro_ref_wait); 748 sema_init(&c->online_fsck_mutex, 1); 749 750 init_rwsem(&c->gc_lock); 751 mutex_init(&c->gc_gens_lock); 752 atomic_set(&c->journal_keys.ref, 1); 753 c->journal_keys.initial_ref_held = true; 754 755 for (i = 0; i < BCH_TIME_STAT_NR; i++) 756 bch2_time_stats_init(&c->times[i]); 757 758 bch2_fs_copygc_init(c); 759 bch2_fs_btree_key_cache_init_early(&c->btree_key_cache); 760 bch2_fs_btree_iter_init_early(c); 761 bch2_fs_btree_interior_update_init_early(c); 762 bch2_fs_allocator_background_init(c); 763 bch2_fs_allocator_foreground_init(c); 764 bch2_fs_rebalance_init(c); 765 bch2_fs_quota_init(c); 766 bch2_fs_ec_init_early(c); 767 bch2_fs_move_init(c); 768 bch2_fs_sb_errors_init_early(c); 769 770 INIT_LIST_HEAD(&c->list); 771 772 mutex_init(&c->usage_scratch_lock); 773 774 mutex_init(&c->bio_bounce_pages_lock); 775 mutex_init(&c->snapshot_table_lock); 776 init_rwsem(&c->snapshot_create_lock); 777 778 spin_lock_init(&c->btree_write_error_lock); 779 780 INIT_WORK(&c->journal_seq_blacklist_gc_work, 781 bch2_blacklist_entries_gc); 782 783 INIT_LIST_HEAD(&c->journal_iters); 784 785 INIT_LIST_HEAD(&c->fsck_error_msgs); 786 mutex_init(&c->fsck_error_msgs_lock); 787 788 seqcount_init(&c->gc_pos_lock); 789 790 seqcount_init(&c->usage_lock); 791 792 sema_init(&c->io_in_flight, 128); 793 794 INIT_LIST_HEAD(&c->vfs_inodes_list); 795 mutex_init(&c->vfs_inodes_lock); 796 797 c->copy_gc_enabled = 1; 798 c->rebalance.enabled = 1; 799 c->promote_whole_extents = true; 800 801 c->journal.flush_write_time = &c->times[BCH_TIME_journal_flush_write]; 802 c->journal.noflush_write_time = &c->times[BCH_TIME_journal_noflush_write]; 803 c->journal.flush_seq_time = &c->times[BCH_TIME_journal_flush_seq]; 804 805 bch2_fs_btree_cache_init_early(&c->btree_cache); 806 807 mutex_init(&c->sectors_available_lock); 808 809 ret = percpu_init_rwsem(&c->mark_lock); 810 if (ret) 811 goto err; 812 813 mutex_lock(&c->sb_lock); 814 ret = bch2_sb_to_fs(c, sb); 815 mutex_unlock(&c->sb_lock); 816 817 if (ret) 818 goto err; 819 820 pr_uuid(&name, c->sb.user_uuid.b); 821 strscpy(c->name, name.buf, sizeof(c->name)); 822 printbuf_exit(&name); 823 824 ret = name.allocation_failure ? -BCH_ERR_ENOMEM_fs_name_alloc : 0; 825 if (ret) 826 goto err; 827 828 /* Compat: */ 829 if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 && 830 !BCH_SB_JOURNAL_FLUSH_DELAY(sb)) 831 SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000); 832 833 if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 && 834 !BCH_SB_JOURNAL_RECLAIM_DELAY(sb)) 835 SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 100); 836 837 c->opts = bch2_opts_default; 838 ret = bch2_opts_from_sb(&c->opts, sb); 839 if (ret) 840 goto err; 841 842 bch2_opts_apply(&c->opts, opts); 843 844 c->btree_key_cache_btrees |= 1U << BTREE_ID_alloc; 845 if (c->opts.inodes_use_key_cache) 846 c->btree_key_cache_btrees |= 1U << BTREE_ID_inodes; 847 c->btree_key_cache_btrees |= 1U << BTREE_ID_logged_ops; 848 849 c->block_bits = ilog2(block_sectors(c)); 850 c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c); 851 852 if (bch2_fs_init_fault("fs_alloc")) { 853 bch_err(c, "fs_alloc fault injected"); 854 ret = -EFAULT; 855 goto err; 856 } 857 858 iter_size = sizeof(struct sort_iter) + 859 (btree_blocks(c) + 1) * 2 * 860 sizeof(struct sort_iter_set); 861 862 c->inode_shard_bits = ilog2(roundup_pow_of_two(num_possible_cpus())); 863 864 if (!(c->btree_update_wq = alloc_workqueue("bcachefs", 865 WQ_FREEZABLE|WQ_UNBOUND|WQ_MEM_RECLAIM, 512)) || 866 !(c->btree_io_complete_wq = alloc_workqueue("bcachefs_btree_io", 867 WQ_FREEZABLE|WQ_MEM_RECLAIM, 1)) || 868 !(c->copygc_wq = alloc_workqueue("bcachefs_copygc", 869 WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) || 870 !(c->io_complete_wq = alloc_workqueue("bcachefs_io", 871 WQ_FREEZABLE|WQ_HIGHPRI|WQ_MEM_RECLAIM, 512)) || 872 !(c->write_ref_wq = alloc_workqueue("bcachefs_write_ref", 873 WQ_FREEZABLE, 0)) || 874 #ifndef BCH_WRITE_REF_DEBUG 875 percpu_ref_init(&c->writes, bch2_writes_disabled, 876 PERCPU_REF_INIT_DEAD, GFP_KERNEL) || 877 #endif 878 mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) || 879 bioset_init(&c->btree_bio, 1, 880 max(offsetof(struct btree_read_bio, bio), 881 offsetof(struct btree_write_bio, wbio.bio)), 882 BIOSET_NEED_BVECS) || 883 !(c->pcpu = alloc_percpu(struct bch_fs_pcpu)) || 884 !(c->online_reserved = alloc_percpu(u64)) || 885 mempool_init_kvpmalloc_pool(&c->btree_bounce_pool, 1, 886 c->opts.btree_node_size) || 887 mempool_init_kmalloc_pool(&c->large_bkey_pool, 1, 2048) || 888 !(c->unused_inode_hints = kcalloc(1U << c->inode_shard_bits, 889 sizeof(u64), GFP_KERNEL))) { 890 ret = -BCH_ERR_ENOMEM_fs_other_alloc; 891 goto err; 892 } 893 894 ret = bch2_fs_counters_init(c) ?: 895 bch2_fs_sb_errors_init(c) ?: 896 bch2_io_clock_init(&c->io_clock[READ]) ?: 897 bch2_io_clock_init(&c->io_clock[WRITE]) ?: 898 bch2_fs_journal_init(&c->journal) ?: 899 bch2_fs_replicas_init(c) ?: 900 bch2_fs_btree_cache_init(c) ?: 901 bch2_fs_btree_key_cache_init(&c->btree_key_cache) ?: 902 bch2_fs_btree_iter_init(c) ?: 903 bch2_fs_btree_interior_update_init(c) ?: 904 bch2_fs_buckets_waiting_for_journal_init(c) ?: 905 bch2_fs_btree_write_buffer_init(c) ?: 906 bch2_fs_subvolumes_init(c) ?: 907 bch2_fs_io_read_init(c) ?: 908 bch2_fs_io_write_init(c) ?: 909 bch2_fs_nocow_locking_init(c) ?: 910 bch2_fs_encryption_init(c) ?: 911 bch2_fs_compress_init(c) ?: 912 bch2_fs_ec_init(c) ?: 913 bch2_fs_fsio_init(c) ?: 914 bch2_fs_fs_io_buffered_init(c) ?: 915 bch2_fs_fs_io_direct_init(c); 916 if (ret) 917 goto err; 918 919 for (i = 0; i < c->sb.nr_devices; i++) 920 if (bch2_dev_exists(c->disk_sb.sb, i) && 921 bch2_dev_alloc(c, i)) { 922 ret = -EEXIST; 923 goto err; 924 } 925 926 bch2_journal_entry_res_resize(&c->journal, 927 &c->btree_root_journal_res, 928 BTREE_ID_NR * (JSET_KEYS_U64s + BKEY_BTREE_PTR_U64s_MAX)); 929 bch2_dev_usage_journal_reserve(c); 930 bch2_journal_entry_res_resize(&c->journal, 931 &c->clock_journal_res, 932 (sizeof(struct jset_entry_clock) / sizeof(u64)) * 2); 933 934 mutex_lock(&bch_fs_list_lock); 935 ret = bch2_fs_online(c); 936 mutex_unlock(&bch_fs_list_lock); 937 938 if (ret) 939 goto err; 940 out: 941 return c; 942 err: 943 bch2_fs_free(c); 944 c = ERR_PTR(ret); 945 goto out; 946 } 947 948 noinline_for_stack 949 static void print_mount_opts(struct bch_fs *c) 950 { 951 enum bch_opt_id i; 952 struct printbuf p = PRINTBUF; 953 bool first = true; 954 955 prt_str(&p, "mounting version "); 956 bch2_version_to_text(&p, c->sb.version); 957 958 if (c->opts.read_only) { 959 prt_str(&p, " opts="); 960 first = false; 961 prt_printf(&p, "ro"); 962 } 963 964 for (i = 0; i < bch2_opts_nr; i++) { 965 const struct bch_option *opt = &bch2_opt_table[i]; 966 u64 v = bch2_opt_get_by_id(&c->opts, i); 967 968 if (!(opt->flags & OPT_MOUNT)) 969 continue; 970 971 if (v == bch2_opt_get_by_id(&bch2_opts_default, i)) 972 continue; 973 974 prt_str(&p, first ? " opts=" : ","); 975 first = false; 976 bch2_opt_to_text(&p, c, c->disk_sb.sb, opt, v, OPT_SHOW_MOUNT_STYLE); 977 } 978 979 bch_info(c, "%s", p.buf); 980 printbuf_exit(&p); 981 } 982 983 int bch2_fs_start(struct bch_fs *c) 984 { 985 time64_t now = ktime_get_real_seconds(); 986 int ret; 987 988 print_mount_opts(c); 989 990 down_write(&c->state_lock); 991 992 BUG_ON(test_bit(BCH_FS_started, &c->flags)); 993 994 mutex_lock(&c->sb_lock); 995 996 ret = bch2_sb_members_v2_init(c); 997 if (ret) { 998 mutex_unlock(&c->sb_lock); 999 goto err; 1000 } 1001 1002 for_each_online_member(c, ca) 1003 bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount = cpu_to_le64(now); 1004 1005 mutex_unlock(&c->sb_lock); 1006 1007 for_each_rw_member(c, ca) 1008 bch2_dev_allocator_add(c, ca); 1009 bch2_recalc_capacity(c); 1010 1011 ret = BCH_SB_INITIALIZED(c->disk_sb.sb) 1012 ? bch2_fs_recovery(c) 1013 : bch2_fs_initialize(c); 1014 if (ret) 1015 goto err; 1016 1017 ret = bch2_opts_check_may_set(c); 1018 if (ret) 1019 goto err; 1020 1021 if (bch2_fs_init_fault("fs_start")) { 1022 bch_err(c, "fs_start fault injected"); 1023 ret = -EINVAL; 1024 goto err; 1025 } 1026 1027 set_bit(BCH_FS_started, &c->flags); 1028 1029 if (c->opts.read_only) { 1030 bch2_fs_read_only(c); 1031 } else { 1032 ret = !test_bit(BCH_FS_rw, &c->flags) 1033 ? bch2_fs_read_write(c) 1034 : bch2_fs_read_write_late(c); 1035 if (ret) 1036 goto err; 1037 } 1038 1039 ret = 0; 1040 err: 1041 if (ret) 1042 bch_err_msg(c, ret, "starting filesystem"); 1043 else 1044 bch_verbose(c, "done starting filesystem"); 1045 up_write(&c->state_lock); 1046 return ret; 1047 } 1048 1049 static int bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c) 1050 { 1051 struct bch_member m = bch2_sb_member_get(sb, sb->dev_idx); 1052 1053 if (le16_to_cpu(sb->block_size) != block_sectors(c)) 1054 return -BCH_ERR_mismatched_block_size; 1055 1056 if (le16_to_cpu(m.bucket_size) < 1057 BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb)) 1058 return -BCH_ERR_bucket_size_too_small; 1059 1060 return 0; 1061 } 1062 1063 static int bch2_dev_in_fs(struct bch_sb_handle *fs, 1064 struct bch_sb_handle *sb) 1065 { 1066 if (fs == sb) 1067 return 0; 1068 1069 if (!uuid_equal(&fs->sb->uuid, &sb->sb->uuid)) 1070 return -BCH_ERR_device_not_a_member_of_filesystem; 1071 1072 if (!bch2_dev_exists(fs->sb, sb->sb->dev_idx)) 1073 return -BCH_ERR_device_has_been_removed; 1074 1075 if (fs->sb->block_size != sb->sb->block_size) 1076 return -BCH_ERR_mismatched_block_size; 1077 1078 if (le16_to_cpu(fs->sb->version) < bcachefs_metadata_version_member_seq || 1079 le16_to_cpu(sb->sb->version) < bcachefs_metadata_version_member_seq) 1080 return 0; 1081 1082 if (fs->sb->seq == sb->sb->seq && 1083 fs->sb->write_time != sb->sb->write_time) { 1084 struct printbuf buf = PRINTBUF; 1085 1086 prt_str(&buf, "Split brain detected between "); 1087 prt_bdevname(&buf, sb->bdev); 1088 prt_str(&buf, " and "); 1089 prt_bdevname(&buf, fs->bdev); 1090 prt_char(&buf, ':'); 1091 prt_newline(&buf); 1092 prt_printf(&buf, "seq=%llu but write_time different, got", le64_to_cpu(sb->sb->seq)); 1093 prt_newline(&buf); 1094 1095 prt_bdevname(&buf, fs->bdev); 1096 prt_char(&buf, ' '); 1097 bch2_prt_datetime(&buf, le64_to_cpu(fs->sb->write_time));; 1098 prt_newline(&buf); 1099 1100 prt_bdevname(&buf, sb->bdev); 1101 prt_char(&buf, ' '); 1102 bch2_prt_datetime(&buf, le64_to_cpu(sb->sb->write_time));; 1103 prt_newline(&buf); 1104 1105 prt_printf(&buf, "Not using older sb"); 1106 1107 pr_err("%s", buf.buf); 1108 printbuf_exit(&buf); 1109 return -BCH_ERR_device_splitbrain; 1110 } 1111 1112 struct bch_member m = bch2_sb_member_get(fs->sb, sb->sb->dev_idx); 1113 u64 seq_from_fs = le64_to_cpu(m.seq); 1114 u64 seq_from_member = le64_to_cpu(sb->sb->seq); 1115 1116 if (seq_from_fs && seq_from_fs < seq_from_member) { 1117 struct printbuf buf = PRINTBUF; 1118 1119 prt_str(&buf, "Split brain detected between "); 1120 prt_bdevname(&buf, sb->bdev); 1121 prt_str(&buf, " and "); 1122 prt_bdevname(&buf, fs->bdev); 1123 prt_char(&buf, ':'); 1124 prt_newline(&buf); 1125 1126 prt_bdevname(&buf, fs->bdev); 1127 prt_str(&buf, "believes seq of "); 1128 prt_bdevname(&buf, sb->bdev); 1129 prt_printf(&buf, " to be %llu, but ", seq_from_fs); 1130 prt_bdevname(&buf, sb->bdev); 1131 prt_printf(&buf, " has %llu\n", seq_from_member); 1132 prt_str(&buf, "Not using "); 1133 prt_bdevname(&buf, sb->bdev); 1134 1135 pr_err("%s", buf.buf); 1136 printbuf_exit(&buf); 1137 return -BCH_ERR_device_splitbrain; 1138 } 1139 1140 return 0; 1141 } 1142 1143 /* Device startup/shutdown: */ 1144 1145 static void bch2_dev_release(struct kobject *kobj) 1146 { 1147 struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj); 1148 1149 kfree(ca); 1150 } 1151 1152 static void bch2_dev_free(struct bch_dev *ca) 1153 { 1154 cancel_work_sync(&ca->io_error_work); 1155 1156 if (ca->kobj.state_in_sysfs && 1157 ca->disk_sb.bdev) 1158 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs"); 1159 1160 if (ca->kobj.state_in_sysfs) 1161 kobject_del(&ca->kobj); 1162 1163 bch2_free_super(&ca->disk_sb); 1164 bch2_dev_journal_exit(ca); 1165 1166 free_percpu(ca->io_done); 1167 bioset_exit(&ca->replica_set); 1168 bch2_dev_buckets_free(ca); 1169 free_page((unsigned long) ca->sb_read_scratch); 1170 1171 bch2_time_stats_exit(&ca->io_latency[WRITE]); 1172 bch2_time_stats_exit(&ca->io_latency[READ]); 1173 1174 percpu_ref_exit(&ca->io_ref); 1175 percpu_ref_exit(&ca->ref); 1176 kobject_put(&ca->kobj); 1177 } 1178 1179 static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca) 1180 { 1181 1182 lockdep_assert_held(&c->state_lock); 1183 1184 if (percpu_ref_is_zero(&ca->io_ref)) 1185 return; 1186 1187 __bch2_dev_read_only(c, ca); 1188 1189 reinit_completion(&ca->io_ref_completion); 1190 percpu_ref_kill(&ca->io_ref); 1191 wait_for_completion(&ca->io_ref_completion); 1192 1193 if (ca->kobj.state_in_sysfs) { 1194 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs"); 1195 sysfs_remove_link(&ca->kobj, "block"); 1196 } 1197 1198 bch2_free_super(&ca->disk_sb); 1199 bch2_dev_journal_exit(ca); 1200 } 1201 1202 static void bch2_dev_ref_complete(struct percpu_ref *ref) 1203 { 1204 struct bch_dev *ca = container_of(ref, struct bch_dev, ref); 1205 1206 complete(&ca->ref_completion); 1207 } 1208 1209 static void bch2_dev_io_ref_complete(struct percpu_ref *ref) 1210 { 1211 struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref); 1212 1213 complete(&ca->io_ref_completion); 1214 } 1215 1216 static int bch2_dev_sysfs_online(struct bch_fs *c, struct bch_dev *ca) 1217 { 1218 int ret; 1219 1220 if (!c->kobj.state_in_sysfs) 1221 return 0; 1222 1223 if (!ca->kobj.state_in_sysfs) { 1224 ret = kobject_add(&ca->kobj, &c->kobj, 1225 "dev-%u", ca->dev_idx); 1226 if (ret) 1227 return ret; 1228 } 1229 1230 if (ca->disk_sb.bdev) { 1231 struct kobject *block = bdev_kobj(ca->disk_sb.bdev); 1232 1233 ret = sysfs_create_link(block, &ca->kobj, "bcachefs"); 1234 if (ret) 1235 return ret; 1236 1237 ret = sysfs_create_link(&ca->kobj, block, "block"); 1238 if (ret) 1239 return ret; 1240 } 1241 1242 return 0; 1243 } 1244 1245 static struct bch_dev *__bch2_dev_alloc(struct bch_fs *c, 1246 struct bch_member *member) 1247 { 1248 struct bch_dev *ca; 1249 unsigned i; 1250 1251 ca = kzalloc(sizeof(*ca), GFP_KERNEL); 1252 if (!ca) 1253 return NULL; 1254 1255 kobject_init(&ca->kobj, &bch2_dev_ktype); 1256 init_completion(&ca->ref_completion); 1257 init_completion(&ca->io_ref_completion); 1258 1259 init_rwsem(&ca->bucket_lock); 1260 1261 INIT_WORK(&ca->io_error_work, bch2_io_error_work); 1262 1263 bch2_time_stats_init(&ca->io_latency[READ]); 1264 bch2_time_stats_init(&ca->io_latency[WRITE]); 1265 1266 ca->mi = bch2_mi_to_cpu(member); 1267 1268 for (i = 0; i < ARRAY_SIZE(member->errors); i++) 1269 atomic64_set(&ca->errors[i], le64_to_cpu(member->errors[i])); 1270 1271 ca->uuid = member->uuid; 1272 1273 ca->nr_btree_reserve = DIV_ROUND_UP(BTREE_NODE_RESERVE, 1274 ca->mi.bucket_size / btree_sectors(c)); 1275 1276 if (percpu_ref_init(&ca->ref, bch2_dev_ref_complete, 1277 0, GFP_KERNEL) || 1278 percpu_ref_init(&ca->io_ref, bch2_dev_io_ref_complete, 1279 PERCPU_REF_INIT_DEAD, GFP_KERNEL) || 1280 !(ca->sb_read_scratch = (void *) __get_free_page(GFP_KERNEL)) || 1281 bch2_dev_buckets_alloc(c, ca) || 1282 bioset_init(&ca->replica_set, 4, 1283 offsetof(struct bch_write_bio, bio), 0) || 1284 !(ca->io_done = alloc_percpu(*ca->io_done))) 1285 goto err; 1286 1287 return ca; 1288 err: 1289 bch2_dev_free(ca); 1290 return NULL; 1291 } 1292 1293 static void bch2_dev_attach(struct bch_fs *c, struct bch_dev *ca, 1294 unsigned dev_idx) 1295 { 1296 ca->dev_idx = dev_idx; 1297 __set_bit(ca->dev_idx, ca->self.d); 1298 scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx); 1299 1300 ca->fs = c; 1301 rcu_assign_pointer(c->devs[ca->dev_idx], ca); 1302 1303 if (bch2_dev_sysfs_online(c, ca)) 1304 pr_warn("error creating sysfs objects"); 1305 } 1306 1307 static int bch2_dev_alloc(struct bch_fs *c, unsigned dev_idx) 1308 { 1309 struct bch_member member = bch2_sb_member_get(c->disk_sb.sb, dev_idx); 1310 struct bch_dev *ca = NULL; 1311 int ret = 0; 1312 1313 if (bch2_fs_init_fault("dev_alloc")) 1314 goto err; 1315 1316 ca = __bch2_dev_alloc(c, &member); 1317 if (!ca) 1318 goto err; 1319 1320 ca->fs = c; 1321 1322 bch2_dev_attach(c, ca, dev_idx); 1323 return ret; 1324 err: 1325 if (ca) 1326 bch2_dev_free(ca); 1327 return -BCH_ERR_ENOMEM_dev_alloc; 1328 } 1329 1330 static int __bch2_dev_attach_bdev(struct bch_dev *ca, struct bch_sb_handle *sb) 1331 { 1332 unsigned ret; 1333 1334 if (bch2_dev_is_online(ca)) { 1335 bch_err(ca, "already have device online in slot %u", 1336 sb->sb->dev_idx); 1337 return -BCH_ERR_device_already_online; 1338 } 1339 1340 if (get_capacity(sb->bdev->bd_disk) < 1341 ca->mi.bucket_size * ca->mi.nbuckets) { 1342 bch_err(ca, "cannot online: device too small"); 1343 return -BCH_ERR_device_size_too_small; 1344 } 1345 1346 BUG_ON(!percpu_ref_is_zero(&ca->io_ref)); 1347 1348 ret = bch2_dev_journal_init(ca, sb->sb); 1349 if (ret) 1350 return ret; 1351 1352 /* Commit: */ 1353 ca->disk_sb = *sb; 1354 memset(sb, 0, sizeof(*sb)); 1355 1356 ca->dev = ca->disk_sb.bdev->bd_dev; 1357 1358 percpu_ref_reinit(&ca->io_ref); 1359 1360 return 0; 1361 } 1362 1363 static int bch2_dev_attach_bdev(struct bch_fs *c, struct bch_sb_handle *sb) 1364 { 1365 struct bch_dev *ca; 1366 int ret; 1367 1368 lockdep_assert_held(&c->state_lock); 1369 1370 if (le64_to_cpu(sb->sb->seq) > 1371 le64_to_cpu(c->disk_sb.sb->seq)) 1372 bch2_sb_to_fs(c, sb->sb); 1373 1374 BUG_ON(sb->sb->dev_idx >= c->sb.nr_devices || 1375 !c->devs[sb->sb->dev_idx]); 1376 1377 ca = bch_dev_locked(c, sb->sb->dev_idx); 1378 1379 ret = __bch2_dev_attach_bdev(ca, sb); 1380 if (ret) 1381 return ret; 1382 1383 bch2_dev_sysfs_online(c, ca); 1384 1385 struct printbuf name = PRINTBUF; 1386 prt_bdevname(&name, ca->disk_sb.bdev); 1387 1388 if (c->sb.nr_devices == 1) 1389 strscpy(c->name, name.buf, sizeof(c->name)); 1390 strscpy(ca->name, name.buf, sizeof(ca->name)); 1391 1392 printbuf_exit(&name); 1393 1394 rebalance_wakeup(c); 1395 return 0; 1396 } 1397 1398 /* Device management: */ 1399 1400 /* 1401 * Note: this function is also used by the error paths - when a particular 1402 * device sees an error, we call it to determine whether we can just set the 1403 * device RO, or - if this function returns false - we'll set the whole 1404 * filesystem RO: 1405 * 1406 * XXX: maybe we should be more explicit about whether we're changing state 1407 * because we got an error or what have you? 1408 */ 1409 bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca, 1410 enum bch_member_state new_state, int flags) 1411 { 1412 struct bch_devs_mask new_online_devs; 1413 int nr_rw = 0, required; 1414 1415 lockdep_assert_held(&c->state_lock); 1416 1417 switch (new_state) { 1418 case BCH_MEMBER_STATE_rw: 1419 return true; 1420 case BCH_MEMBER_STATE_ro: 1421 if (ca->mi.state != BCH_MEMBER_STATE_rw) 1422 return true; 1423 1424 /* do we have enough devices to write to? */ 1425 for_each_member_device(c, ca2) 1426 if (ca2 != ca) 1427 nr_rw += ca2->mi.state == BCH_MEMBER_STATE_rw; 1428 1429 required = max(!(flags & BCH_FORCE_IF_METADATA_DEGRADED) 1430 ? c->opts.metadata_replicas 1431 : c->opts.metadata_replicas_required, 1432 !(flags & BCH_FORCE_IF_DATA_DEGRADED) 1433 ? c->opts.data_replicas 1434 : c->opts.data_replicas_required); 1435 1436 return nr_rw >= required; 1437 case BCH_MEMBER_STATE_failed: 1438 case BCH_MEMBER_STATE_spare: 1439 if (ca->mi.state != BCH_MEMBER_STATE_rw && 1440 ca->mi.state != BCH_MEMBER_STATE_ro) 1441 return true; 1442 1443 /* do we have enough devices to read from? */ 1444 new_online_devs = bch2_online_devs(c); 1445 __clear_bit(ca->dev_idx, new_online_devs.d); 1446 1447 return bch2_have_enough_devs(c, new_online_devs, flags, false); 1448 default: 1449 BUG(); 1450 } 1451 } 1452 1453 static bool bch2_fs_may_start(struct bch_fs *c) 1454 { 1455 struct bch_dev *ca; 1456 unsigned i, flags = 0; 1457 1458 if (c->opts.very_degraded) 1459 flags |= BCH_FORCE_IF_DEGRADED|BCH_FORCE_IF_LOST; 1460 1461 if (c->opts.degraded) 1462 flags |= BCH_FORCE_IF_DEGRADED; 1463 1464 if (!c->opts.degraded && 1465 !c->opts.very_degraded) { 1466 mutex_lock(&c->sb_lock); 1467 1468 for (i = 0; i < c->disk_sb.sb->nr_devices; i++) { 1469 if (!bch2_dev_exists(c->disk_sb.sb, i)) 1470 continue; 1471 1472 ca = bch_dev_locked(c, i); 1473 1474 if (!bch2_dev_is_online(ca) && 1475 (ca->mi.state == BCH_MEMBER_STATE_rw || 1476 ca->mi.state == BCH_MEMBER_STATE_ro)) { 1477 mutex_unlock(&c->sb_lock); 1478 return false; 1479 } 1480 } 1481 mutex_unlock(&c->sb_lock); 1482 } 1483 1484 return bch2_have_enough_devs(c, bch2_online_devs(c), flags, true); 1485 } 1486 1487 static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca) 1488 { 1489 /* 1490 * The allocator thread itself allocates btree nodes, so stop it first: 1491 */ 1492 bch2_dev_allocator_remove(c, ca); 1493 bch2_dev_journal_stop(&c->journal, ca); 1494 } 1495 1496 static void __bch2_dev_read_write(struct bch_fs *c, struct bch_dev *ca) 1497 { 1498 lockdep_assert_held(&c->state_lock); 1499 1500 BUG_ON(ca->mi.state != BCH_MEMBER_STATE_rw); 1501 1502 bch2_dev_allocator_add(c, ca); 1503 bch2_recalc_capacity(c); 1504 } 1505 1506 int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca, 1507 enum bch_member_state new_state, int flags) 1508 { 1509 struct bch_member *m; 1510 int ret = 0; 1511 1512 if (ca->mi.state == new_state) 1513 return 0; 1514 1515 if (!bch2_dev_state_allowed(c, ca, new_state, flags)) 1516 return -BCH_ERR_device_state_not_allowed; 1517 1518 if (new_state != BCH_MEMBER_STATE_rw) 1519 __bch2_dev_read_only(c, ca); 1520 1521 bch_notice(ca, "%s", bch2_member_states[new_state]); 1522 1523 mutex_lock(&c->sb_lock); 1524 m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx); 1525 SET_BCH_MEMBER_STATE(m, new_state); 1526 bch2_write_super(c); 1527 mutex_unlock(&c->sb_lock); 1528 1529 if (new_state == BCH_MEMBER_STATE_rw) 1530 __bch2_dev_read_write(c, ca); 1531 1532 rebalance_wakeup(c); 1533 1534 return ret; 1535 } 1536 1537 int bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca, 1538 enum bch_member_state new_state, int flags) 1539 { 1540 int ret; 1541 1542 down_write(&c->state_lock); 1543 ret = __bch2_dev_set_state(c, ca, new_state, flags); 1544 up_write(&c->state_lock); 1545 1546 return ret; 1547 } 1548 1549 /* Device add/removal: */ 1550 1551 static int bch2_dev_remove_alloc(struct bch_fs *c, struct bch_dev *ca) 1552 { 1553 struct bpos start = POS(ca->dev_idx, 0); 1554 struct bpos end = POS(ca->dev_idx, U64_MAX); 1555 int ret; 1556 1557 /* 1558 * We clear the LRU and need_discard btrees first so that we don't race 1559 * with bch2_do_invalidates() and bch2_do_discards() 1560 */ 1561 ret = bch2_btree_delete_range(c, BTREE_ID_lru, start, end, 1562 BTREE_TRIGGER_NORUN, NULL) ?: 1563 bch2_btree_delete_range(c, BTREE_ID_need_discard, start, end, 1564 BTREE_TRIGGER_NORUN, NULL) ?: 1565 bch2_btree_delete_range(c, BTREE_ID_freespace, start, end, 1566 BTREE_TRIGGER_NORUN, NULL) ?: 1567 bch2_btree_delete_range(c, BTREE_ID_backpointers, start, end, 1568 BTREE_TRIGGER_NORUN, NULL) ?: 1569 bch2_btree_delete_range(c, BTREE_ID_alloc, start, end, 1570 BTREE_TRIGGER_NORUN, NULL) ?: 1571 bch2_btree_delete_range(c, BTREE_ID_bucket_gens, start, end, 1572 BTREE_TRIGGER_NORUN, NULL); 1573 bch_err_msg(c, ret, "removing dev alloc info"); 1574 return ret; 1575 } 1576 1577 int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags) 1578 { 1579 struct bch_member *m; 1580 unsigned dev_idx = ca->dev_idx, data; 1581 int ret; 1582 1583 down_write(&c->state_lock); 1584 1585 /* 1586 * We consume a reference to ca->ref, regardless of whether we succeed 1587 * or fail: 1588 */ 1589 percpu_ref_put(&ca->ref); 1590 1591 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) { 1592 bch_err(ca, "Cannot remove without losing data"); 1593 ret = -BCH_ERR_device_state_not_allowed; 1594 goto err; 1595 } 1596 1597 __bch2_dev_read_only(c, ca); 1598 1599 ret = bch2_dev_data_drop(c, ca->dev_idx, flags); 1600 bch_err_msg(ca, ret, "dropping data"); 1601 if (ret) 1602 goto err; 1603 1604 ret = bch2_dev_remove_alloc(c, ca); 1605 bch_err_msg(ca, ret, "deleting alloc info"); 1606 if (ret) 1607 goto err; 1608 1609 ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx); 1610 bch_err_msg(ca, ret, "flushing journal"); 1611 if (ret) 1612 goto err; 1613 1614 ret = bch2_journal_flush(&c->journal); 1615 bch_err(ca, "journal error"); 1616 if (ret) 1617 goto err; 1618 1619 ret = bch2_replicas_gc2(c); 1620 bch_err_msg(ca, ret, "in replicas_gc2()"); 1621 if (ret) 1622 goto err; 1623 1624 data = bch2_dev_has_data(c, ca); 1625 if (data) { 1626 struct printbuf data_has = PRINTBUF; 1627 1628 prt_bitflags(&data_has, __bch2_data_types, data); 1629 bch_err(ca, "Remove failed, still has data (%s)", data_has.buf); 1630 printbuf_exit(&data_has); 1631 ret = -EBUSY; 1632 goto err; 1633 } 1634 1635 __bch2_dev_offline(c, ca); 1636 1637 mutex_lock(&c->sb_lock); 1638 rcu_assign_pointer(c->devs[ca->dev_idx], NULL); 1639 mutex_unlock(&c->sb_lock); 1640 1641 percpu_ref_kill(&ca->ref); 1642 wait_for_completion(&ca->ref_completion); 1643 1644 bch2_dev_free(ca); 1645 1646 /* 1647 * At this point the device object has been removed in-core, but the 1648 * on-disk journal might still refer to the device index via sb device 1649 * usage entries. Recovery fails if it sees usage information for an 1650 * invalid device. Flush journal pins to push the back of the journal 1651 * past now invalid device index references before we update the 1652 * superblock, but after the device object has been removed so any 1653 * further journal writes elide usage info for the device. 1654 */ 1655 bch2_journal_flush_all_pins(&c->journal); 1656 1657 /* 1658 * Free this device's slot in the bch_member array - all pointers to 1659 * this device must be gone: 1660 */ 1661 mutex_lock(&c->sb_lock); 1662 m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx); 1663 memset(&m->uuid, 0, sizeof(m->uuid)); 1664 1665 bch2_write_super(c); 1666 1667 mutex_unlock(&c->sb_lock); 1668 up_write(&c->state_lock); 1669 1670 bch2_dev_usage_journal_reserve(c); 1671 return 0; 1672 err: 1673 if (ca->mi.state == BCH_MEMBER_STATE_rw && 1674 !percpu_ref_is_zero(&ca->io_ref)) 1675 __bch2_dev_read_write(c, ca); 1676 up_write(&c->state_lock); 1677 return ret; 1678 } 1679 1680 /* Add new device to running filesystem: */ 1681 int bch2_dev_add(struct bch_fs *c, const char *path) 1682 { 1683 struct bch_opts opts = bch2_opts_empty(); 1684 struct bch_sb_handle sb; 1685 struct bch_dev *ca = NULL; 1686 struct bch_sb_field_members_v2 *mi; 1687 struct bch_member dev_mi; 1688 unsigned dev_idx, nr_devices, u64s; 1689 struct printbuf errbuf = PRINTBUF; 1690 struct printbuf label = PRINTBUF; 1691 int ret; 1692 1693 ret = bch2_read_super(path, &opts, &sb); 1694 bch_err_msg(c, ret, "reading super"); 1695 if (ret) 1696 goto err; 1697 1698 dev_mi = bch2_sb_member_get(sb.sb, sb.sb->dev_idx); 1699 1700 if (BCH_MEMBER_GROUP(&dev_mi)) { 1701 bch2_disk_path_to_text_sb(&label, sb.sb, BCH_MEMBER_GROUP(&dev_mi) - 1); 1702 if (label.allocation_failure) { 1703 ret = -ENOMEM; 1704 goto err; 1705 } 1706 } 1707 1708 ret = bch2_dev_may_add(sb.sb, c); 1709 if (ret) 1710 goto err; 1711 1712 ca = __bch2_dev_alloc(c, &dev_mi); 1713 if (!ca) { 1714 ret = -ENOMEM; 1715 goto err; 1716 } 1717 1718 bch2_dev_usage_init(ca); 1719 1720 ret = __bch2_dev_attach_bdev(ca, &sb); 1721 if (ret) 1722 goto err; 1723 1724 ret = bch2_dev_journal_alloc(ca); 1725 bch_err_msg(c, ret, "allocating journal"); 1726 if (ret) 1727 goto err; 1728 1729 down_write(&c->state_lock); 1730 mutex_lock(&c->sb_lock); 1731 1732 ret = bch2_sb_from_fs(c, ca); 1733 bch_err_msg(c, ret, "setting up new superblock"); 1734 if (ret) 1735 goto err_unlock; 1736 1737 if (dynamic_fault("bcachefs:add:no_slot")) 1738 goto no_slot; 1739 1740 for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++) 1741 if (!bch2_dev_exists(c->disk_sb.sb, dev_idx)) 1742 goto have_slot; 1743 no_slot: 1744 ret = -BCH_ERR_ENOSPC_sb_members; 1745 bch_err_msg(c, ret, "setting up new superblock"); 1746 goto err_unlock; 1747 1748 have_slot: 1749 nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices); 1750 1751 mi = bch2_sb_field_get(c->disk_sb.sb, members_v2); 1752 u64s = DIV_ROUND_UP(sizeof(struct bch_sb_field_members_v2) + 1753 le16_to_cpu(mi->member_bytes) * nr_devices, sizeof(u64)); 1754 1755 mi = bch2_sb_field_resize(&c->disk_sb, members_v2, u64s); 1756 if (!mi) { 1757 ret = -BCH_ERR_ENOSPC_sb_members; 1758 bch_err_msg(c, ret, "setting up new superblock"); 1759 goto err_unlock; 1760 } 1761 struct bch_member *m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx); 1762 1763 /* success: */ 1764 1765 *m = dev_mi; 1766 m->last_mount = cpu_to_le64(ktime_get_real_seconds()); 1767 c->disk_sb.sb->nr_devices = nr_devices; 1768 1769 ca->disk_sb.sb->dev_idx = dev_idx; 1770 bch2_dev_attach(c, ca, dev_idx); 1771 1772 if (BCH_MEMBER_GROUP(&dev_mi)) { 1773 ret = __bch2_dev_group_set(c, ca, label.buf); 1774 bch_err_msg(c, ret, "creating new label"); 1775 if (ret) 1776 goto err_unlock; 1777 } 1778 1779 bch2_write_super(c); 1780 mutex_unlock(&c->sb_lock); 1781 1782 bch2_dev_usage_journal_reserve(c); 1783 1784 ret = bch2_trans_mark_dev_sb(c, ca); 1785 bch_err_msg(ca, ret, "marking new superblock"); 1786 if (ret) 1787 goto err_late; 1788 1789 ret = bch2_fs_freespace_init(c); 1790 bch_err_msg(ca, ret, "initializing free space"); 1791 if (ret) 1792 goto err_late; 1793 1794 ca->new_fs_bucket_idx = 0; 1795 1796 if (ca->mi.state == BCH_MEMBER_STATE_rw) 1797 __bch2_dev_read_write(c, ca); 1798 1799 up_write(&c->state_lock); 1800 return 0; 1801 1802 err_unlock: 1803 mutex_unlock(&c->sb_lock); 1804 up_write(&c->state_lock); 1805 err: 1806 if (ca) 1807 bch2_dev_free(ca); 1808 bch2_free_super(&sb); 1809 printbuf_exit(&label); 1810 printbuf_exit(&errbuf); 1811 bch_err_fn(c, ret); 1812 return ret; 1813 err_late: 1814 up_write(&c->state_lock); 1815 ca = NULL; 1816 goto err; 1817 } 1818 1819 /* Hot add existing device to running filesystem: */ 1820 int bch2_dev_online(struct bch_fs *c, const char *path) 1821 { 1822 struct bch_opts opts = bch2_opts_empty(); 1823 struct bch_sb_handle sb = { NULL }; 1824 struct bch_dev *ca; 1825 unsigned dev_idx; 1826 int ret; 1827 1828 down_write(&c->state_lock); 1829 1830 ret = bch2_read_super(path, &opts, &sb); 1831 if (ret) { 1832 up_write(&c->state_lock); 1833 return ret; 1834 } 1835 1836 dev_idx = sb.sb->dev_idx; 1837 1838 ret = bch2_dev_in_fs(&c->disk_sb, &sb); 1839 bch_err_msg(c, ret, "bringing %s online", path); 1840 if (ret) 1841 goto err; 1842 1843 ret = bch2_dev_attach_bdev(c, &sb); 1844 if (ret) 1845 goto err; 1846 1847 ca = bch_dev_locked(c, dev_idx); 1848 1849 ret = bch2_trans_mark_dev_sb(c, ca); 1850 bch_err_msg(c, ret, "bringing %s online: error from bch2_trans_mark_dev_sb", path); 1851 if (ret) 1852 goto err; 1853 1854 if (ca->mi.state == BCH_MEMBER_STATE_rw) 1855 __bch2_dev_read_write(c, ca); 1856 1857 if (!ca->mi.freespace_initialized) { 1858 ret = bch2_dev_freespace_init(c, ca, 0, ca->mi.nbuckets); 1859 bch_err_msg(ca, ret, "initializing free space"); 1860 if (ret) 1861 goto err; 1862 } 1863 1864 if (!ca->journal.nr) { 1865 ret = bch2_dev_journal_alloc(ca); 1866 bch_err_msg(ca, ret, "allocating journal"); 1867 if (ret) 1868 goto err; 1869 } 1870 1871 mutex_lock(&c->sb_lock); 1872 bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount = 1873 cpu_to_le64(ktime_get_real_seconds()); 1874 bch2_write_super(c); 1875 mutex_unlock(&c->sb_lock); 1876 1877 up_write(&c->state_lock); 1878 return 0; 1879 err: 1880 up_write(&c->state_lock); 1881 bch2_free_super(&sb); 1882 return ret; 1883 } 1884 1885 int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags) 1886 { 1887 down_write(&c->state_lock); 1888 1889 if (!bch2_dev_is_online(ca)) { 1890 bch_err(ca, "Already offline"); 1891 up_write(&c->state_lock); 1892 return 0; 1893 } 1894 1895 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) { 1896 bch_err(ca, "Cannot offline required disk"); 1897 up_write(&c->state_lock); 1898 return -BCH_ERR_device_state_not_allowed; 1899 } 1900 1901 __bch2_dev_offline(c, ca); 1902 1903 up_write(&c->state_lock); 1904 return 0; 1905 } 1906 1907 int bch2_dev_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets) 1908 { 1909 struct bch_member *m; 1910 u64 old_nbuckets; 1911 int ret = 0; 1912 1913 down_write(&c->state_lock); 1914 old_nbuckets = ca->mi.nbuckets; 1915 1916 if (nbuckets < ca->mi.nbuckets) { 1917 bch_err(ca, "Cannot shrink yet"); 1918 ret = -EINVAL; 1919 goto err; 1920 } 1921 1922 if (bch2_dev_is_online(ca) && 1923 get_capacity(ca->disk_sb.bdev->bd_disk) < 1924 ca->mi.bucket_size * nbuckets) { 1925 bch_err(ca, "New size larger than device"); 1926 ret = -BCH_ERR_device_size_too_small; 1927 goto err; 1928 } 1929 1930 ret = bch2_dev_buckets_resize(c, ca, nbuckets); 1931 bch_err_msg(ca, ret, "resizing buckets"); 1932 if (ret) 1933 goto err; 1934 1935 ret = bch2_trans_mark_dev_sb(c, ca); 1936 if (ret) 1937 goto err; 1938 1939 mutex_lock(&c->sb_lock); 1940 m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx); 1941 m->nbuckets = cpu_to_le64(nbuckets); 1942 1943 bch2_write_super(c); 1944 mutex_unlock(&c->sb_lock); 1945 1946 if (ca->mi.freespace_initialized) { 1947 ret = bch2_dev_freespace_init(c, ca, old_nbuckets, nbuckets); 1948 if (ret) 1949 goto err; 1950 1951 /* 1952 * XXX: this is all wrong transactionally - we'll be able to do 1953 * this correctly after the disk space accounting rewrite 1954 */ 1955 ca->usage_base->d[BCH_DATA_free].buckets += nbuckets - old_nbuckets; 1956 } 1957 1958 bch2_recalc_capacity(c); 1959 err: 1960 up_write(&c->state_lock); 1961 return ret; 1962 } 1963 1964 /* return with ref on ca->ref: */ 1965 struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *name) 1966 { 1967 rcu_read_lock(); 1968 for_each_member_device_rcu(c, ca, NULL) 1969 if (!strcmp(name, ca->name)) { 1970 rcu_read_unlock(); 1971 return ca; 1972 } 1973 rcu_read_unlock(); 1974 return ERR_PTR(-BCH_ERR_ENOENT_dev_not_found); 1975 } 1976 1977 /* Filesystem open: */ 1978 1979 static inline int sb_cmp(struct bch_sb *l, struct bch_sb *r) 1980 { 1981 return cmp_int(le64_to_cpu(l->seq), le64_to_cpu(r->seq)) ?: 1982 cmp_int(le64_to_cpu(l->write_time), le64_to_cpu(r->write_time)); 1983 } 1984 1985 struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices, 1986 struct bch_opts opts) 1987 { 1988 DARRAY(struct bch_sb_handle) sbs = { 0 }; 1989 struct bch_fs *c = NULL; 1990 struct bch_sb_handle *best = NULL; 1991 struct printbuf errbuf = PRINTBUF; 1992 int ret = 0; 1993 1994 if (!try_module_get(THIS_MODULE)) 1995 return ERR_PTR(-ENODEV); 1996 1997 if (!nr_devices) { 1998 ret = -EINVAL; 1999 goto err; 2000 } 2001 2002 ret = darray_make_room(&sbs, nr_devices); 2003 if (ret) 2004 goto err; 2005 2006 for (unsigned i = 0; i < nr_devices; i++) { 2007 struct bch_sb_handle sb = { NULL }; 2008 2009 ret = bch2_read_super(devices[i], &opts, &sb); 2010 if (ret) 2011 goto err; 2012 2013 BUG_ON(darray_push(&sbs, sb)); 2014 } 2015 2016 if (opts.nochanges && !opts.read_only) { 2017 ret = -BCH_ERR_erofs_nochanges; 2018 goto err_print; 2019 } 2020 2021 darray_for_each(sbs, sb) 2022 if (!best || sb_cmp(sb->sb, best->sb) > 0) 2023 best = sb; 2024 2025 darray_for_each_reverse(sbs, sb) { 2026 ret = bch2_dev_in_fs(best, sb); 2027 2028 if (ret == -BCH_ERR_device_has_been_removed || 2029 ret == -BCH_ERR_device_splitbrain) { 2030 bch2_free_super(sb); 2031 darray_remove_item(&sbs, sb); 2032 best -= best > sb; 2033 ret = 0; 2034 continue; 2035 } 2036 2037 if (ret) 2038 goto err_print; 2039 } 2040 2041 c = bch2_fs_alloc(best->sb, opts); 2042 ret = PTR_ERR_OR_ZERO(c); 2043 if (ret) 2044 goto err; 2045 2046 down_write(&c->state_lock); 2047 darray_for_each(sbs, sb) { 2048 ret = bch2_dev_attach_bdev(c, sb); 2049 if (ret) { 2050 up_write(&c->state_lock); 2051 goto err; 2052 } 2053 } 2054 up_write(&c->state_lock); 2055 2056 if (!bch2_fs_may_start(c)) { 2057 ret = -BCH_ERR_insufficient_devices_to_start; 2058 goto err_print; 2059 } 2060 2061 if (!c->opts.nostart) { 2062 ret = bch2_fs_start(c); 2063 if (ret) 2064 goto err; 2065 } 2066 out: 2067 darray_for_each(sbs, sb) 2068 bch2_free_super(sb); 2069 darray_exit(&sbs); 2070 printbuf_exit(&errbuf); 2071 module_put(THIS_MODULE); 2072 return c; 2073 err_print: 2074 pr_err("bch_fs_open err opening %s: %s", 2075 devices[0], bch2_err_str(ret)); 2076 err: 2077 if (!IS_ERR_OR_NULL(c)) 2078 bch2_fs_stop(c); 2079 c = ERR_PTR(ret); 2080 goto out; 2081 } 2082 2083 /* Global interfaces/init */ 2084 2085 static void bcachefs_exit(void) 2086 { 2087 bch2_debug_exit(); 2088 bch2_vfs_exit(); 2089 bch2_chardev_exit(); 2090 bch2_btree_key_cache_exit(); 2091 if (bcachefs_kset) 2092 kset_unregister(bcachefs_kset); 2093 } 2094 2095 static int __init bcachefs_init(void) 2096 { 2097 bch2_bkey_pack_test(); 2098 2099 if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) || 2100 bch2_btree_key_cache_init() || 2101 bch2_chardev_init() || 2102 bch2_vfs_init() || 2103 bch2_debug_init()) 2104 goto err; 2105 2106 return 0; 2107 err: 2108 bcachefs_exit(); 2109 return -ENOMEM; 2110 } 2111 2112 #define BCH_DEBUG_PARAM(name, description) \ 2113 bool bch2_##name; \ 2114 module_param_named(name, bch2_##name, bool, 0644); \ 2115 MODULE_PARM_DESC(name, description); 2116 BCH_DEBUG_PARAMS() 2117 #undef BCH_DEBUG_PARAM 2118 2119 __maybe_unused 2120 static unsigned bch2_metadata_version = bcachefs_metadata_version_current; 2121 module_param_named(version, bch2_metadata_version, uint, 0400); 2122 2123 module_exit(bcachefs_exit); 2124 module_init(bcachefs_init); 2125