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 "counters.h" 27 #include "debug.h" 28 #include "disk_groups.h" 29 #include "ec.h" 30 #include "errcode.h" 31 #include "error.h" 32 #include "fs.h" 33 #include "fs-io.h" 34 #include "fs-io-buffered.h" 35 #include "fs-io-direct.h" 36 #include "fsck.h" 37 #include "inode.h" 38 #include "io_read.h" 39 #include "io_write.h" 40 #include "journal.h" 41 #include "journal_reclaim.h" 42 #include "journal_seq_blacklist.h" 43 #include "move.h" 44 #include "migrate.h" 45 #include "movinggc.h" 46 #include "nocow_locking.h" 47 #include "quota.h" 48 #include "rebalance.h" 49 #include "recovery.h" 50 #include "replicas.h" 51 #include "sb-clean.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 #define KTYPE(type) \ 83 static const struct attribute_group type ## _group = { \ 84 .attrs = type ## _files \ 85 }; \ 86 \ 87 static const struct attribute_group *type ## _groups[] = { \ 88 &type ## _group, \ 89 NULL \ 90 }; \ 91 \ 92 static const struct kobj_type type ## _ktype = { \ 93 .release = type ## _release, \ 94 .sysfs_ops = &type ## _sysfs_ops, \ 95 .default_groups = type ## _groups \ 96 } 97 98 static void bch2_fs_release(struct kobject *); 99 static void bch2_dev_release(struct kobject *); 100 static void bch2_fs_counters_release(struct kobject *k) 101 { 102 } 103 104 static void bch2_fs_internal_release(struct kobject *k) 105 { 106 } 107 108 static void bch2_fs_opts_dir_release(struct kobject *k) 109 { 110 } 111 112 static void bch2_fs_time_stats_release(struct kobject *k) 113 { 114 } 115 116 KTYPE(bch2_fs); 117 KTYPE(bch2_fs_counters); 118 KTYPE(bch2_fs_internal); 119 KTYPE(bch2_fs_opts_dir); 120 KTYPE(bch2_fs_time_stats); 121 KTYPE(bch2_dev); 122 123 static struct kset *bcachefs_kset; 124 static LIST_HEAD(bch_fs_list); 125 static DEFINE_MUTEX(bch_fs_list_lock); 126 127 DECLARE_WAIT_QUEUE_HEAD(bch2_read_only_wait); 128 129 static void bch2_dev_free(struct bch_dev *); 130 static int bch2_dev_alloc(struct bch_fs *, unsigned); 131 static int bch2_dev_sysfs_online(struct bch_fs *, struct bch_dev *); 132 static void __bch2_dev_read_only(struct bch_fs *, struct bch_dev *); 133 134 struct bch_fs *bch2_dev_to_fs(dev_t dev) 135 { 136 struct bch_fs *c; 137 struct bch_dev *ca; 138 unsigned i; 139 140 mutex_lock(&bch_fs_list_lock); 141 rcu_read_lock(); 142 143 list_for_each_entry(c, &bch_fs_list, list) 144 for_each_member_device_rcu(ca, c, i, NULL) 145 if (ca->disk_sb.bdev && ca->disk_sb.bdev->bd_dev == dev) { 146 closure_get(&c->cl); 147 goto found; 148 } 149 c = NULL; 150 found: 151 rcu_read_unlock(); 152 mutex_unlock(&bch_fs_list_lock); 153 154 return c; 155 } 156 157 static struct bch_fs *__bch2_uuid_to_fs(__uuid_t uuid) 158 { 159 struct bch_fs *c; 160 161 lockdep_assert_held(&bch_fs_list_lock); 162 163 list_for_each_entry(c, &bch_fs_list, list) 164 if (!memcmp(&c->disk_sb.sb->uuid, &uuid, sizeof(uuid))) 165 return c; 166 167 return NULL; 168 } 169 170 struct bch_fs *bch2_uuid_to_fs(__uuid_t uuid) 171 { 172 struct bch_fs *c; 173 174 mutex_lock(&bch_fs_list_lock); 175 c = __bch2_uuid_to_fs(uuid); 176 if (c) 177 closure_get(&c->cl); 178 mutex_unlock(&bch_fs_list_lock); 179 180 return c; 181 } 182 183 static void bch2_dev_usage_journal_reserve(struct bch_fs *c) 184 { 185 struct bch_dev *ca; 186 unsigned i, nr = 0, u64s = 187 ((sizeof(struct jset_entry_dev_usage) + 188 sizeof(struct jset_entry_dev_usage_type) * BCH_DATA_NR)) / 189 sizeof(u64); 190 191 rcu_read_lock(); 192 for_each_member_device_rcu(ca, c, i, NULL) 193 nr++; 194 rcu_read_unlock(); 195 196 bch2_journal_entry_res_resize(&c->journal, 197 &c->dev_usage_journal_res, u64s * nr); 198 } 199 200 /* Filesystem RO/RW: */ 201 202 /* 203 * For startup/shutdown of RW stuff, the dependencies are: 204 * 205 * - foreground writes depend on copygc and rebalance (to free up space) 206 * 207 * - copygc and rebalance depend on mark and sweep gc (they actually probably 208 * don't because they either reserve ahead of time or don't block if 209 * allocations fail, but allocations can require mark and sweep gc to run 210 * because of generation number wraparound) 211 * 212 * - all of the above depends on the allocator threads 213 * 214 * - allocator depends on the journal (when it rewrites prios and gens) 215 */ 216 217 static void __bch2_fs_read_only(struct bch_fs *c) 218 { 219 struct bch_dev *ca; 220 unsigned i, clean_passes = 0; 221 u64 seq = 0; 222 223 bch2_fs_ec_stop(c); 224 bch2_open_buckets_stop(c, NULL, true); 225 bch2_rebalance_stop(c); 226 bch2_copygc_stop(c); 227 bch2_gc_thread_stop(c); 228 bch2_fs_ec_flush(c); 229 230 bch_verbose(c, "flushing journal and stopping allocators, journal seq %llu", 231 journal_cur_seq(&c->journal)); 232 233 do { 234 clean_passes++; 235 236 if (bch2_btree_interior_updates_flush(c) || 237 bch2_journal_flush_all_pins(&c->journal) || 238 bch2_btree_flush_all_writes(c) || 239 seq != atomic64_read(&c->journal.seq)) { 240 seq = atomic64_read(&c->journal.seq); 241 clean_passes = 0; 242 } 243 } while (clean_passes < 2); 244 245 bch_verbose(c, "flushing journal and stopping allocators complete, journal seq %llu", 246 journal_cur_seq(&c->journal)); 247 248 if (test_bit(JOURNAL_REPLAY_DONE, &c->journal.flags) && 249 !test_bit(BCH_FS_EMERGENCY_RO, &c->flags)) 250 set_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags); 251 bch2_fs_journal_stop(&c->journal); 252 253 /* 254 * After stopping journal: 255 */ 256 for_each_member_device(ca, c, i) 257 bch2_dev_allocator_remove(c, ca); 258 } 259 260 #ifndef BCH_WRITE_REF_DEBUG 261 static void bch2_writes_disabled(struct percpu_ref *writes) 262 { 263 struct bch_fs *c = container_of(writes, struct bch_fs, writes); 264 265 set_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags); 266 wake_up(&bch2_read_only_wait); 267 } 268 #endif 269 270 void bch2_fs_read_only(struct bch_fs *c) 271 { 272 if (!test_bit(BCH_FS_RW, &c->flags)) { 273 bch2_journal_reclaim_stop(&c->journal); 274 return; 275 } 276 277 BUG_ON(test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags)); 278 279 /* 280 * Block new foreground-end write operations from starting - any new 281 * writes will return -EROFS: 282 */ 283 set_bit(BCH_FS_GOING_RO, &c->flags); 284 #ifndef BCH_WRITE_REF_DEBUG 285 percpu_ref_kill(&c->writes); 286 #else 287 for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++) 288 bch2_write_ref_put(c, i); 289 #endif 290 291 /* 292 * If we're not doing an emergency shutdown, we want to wait on 293 * outstanding writes to complete so they don't see spurious errors due 294 * to shutting down the allocator: 295 * 296 * If we are doing an emergency shutdown outstanding writes may 297 * hang until we shutdown the allocator so we don't want to wait 298 * on outstanding writes before shutting everything down - but 299 * we do need to wait on them before returning and signalling 300 * that going RO is complete: 301 */ 302 wait_event(bch2_read_only_wait, 303 test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags) || 304 test_bit(BCH_FS_EMERGENCY_RO, &c->flags)); 305 306 __bch2_fs_read_only(c); 307 308 wait_event(bch2_read_only_wait, 309 test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags)); 310 311 clear_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags); 312 clear_bit(BCH_FS_GOING_RO, &c->flags); 313 314 if (!bch2_journal_error(&c->journal) && 315 !test_bit(BCH_FS_ERROR, &c->flags) && 316 !test_bit(BCH_FS_EMERGENCY_RO, &c->flags) && 317 test_bit(BCH_FS_STARTED, &c->flags) && 318 test_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags) && 319 !c->opts.norecovery) { 320 BUG_ON(c->journal.last_empty_seq != journal_cur_seq(&c->journal)); 321 BUG_ON(atomic_read(&c->btree_cache.dirty)); 322 BUG_ON(atomic_long_read(&c->btree_key_cache.nr_dirty)); 323 BUG_ON(c->btree_write_buffer.state.nr); 324 325 bch_verbose(c, "marking filesystem clean"); 326 bch2_fs_mark_clean(c); 327 } 328 329 clear_bit(BCH_FS_RW, &c->flags); 330 } 331 332 static void bch2_fs_read_only_work(struct work_struct *work) 333 { 334 struct bch_fs *c = 335 container_of(work, struct bch_fs, read_only_work); 336 337 down_write(&c->state_lock); 338 bch2_fs_read_only(c); 339 up_write(&c->state_lock); 340 } 341 342 static void bch2_fs_read_only_async(struct bch_fs *c) 343 { 344 queue_work(system_long_wq, &c->read_only_work); 345 } 346 347 bool bch2_fs_emergency_read_only(struct bch_fs *c) 348 { 349 bool ret = !test_and_set_bit(BCH_FS_EMERGENCY_RO, &c->flags); 350 351 bch2_journal_halt(&c->journal); 352 bch2_fs_read_only_async(c); 353 354 wake_up(&bch2_read_only_wait); 355 return ret; 356 } 357 358 static int bch2_fs_read_write_late(struct bch_fs *c) 359 { 360 int ret; 361 362 /* 363 * Data move operations can't run until after check_snapshots has 364 * completed, and bch2_snapshot_is_ancestor() is available. 365 * 366 * Ideally we'd start copygc/rebalance earlier instead of waiting for 367 * all of recovery/fsck to complete: 368 */ 369 ret = bch2_copygc_start(c); 370 if (ret) { 371 bch_err(c, "error starting copygc thread"); 372 return ret; 373 } 374 375 ret = bch2_rebalance_start(c); 376 if (ret) { 377 bch_err(c, "error starting rebalance thread"); 378 return ret; 379 } 380 381 return 0; 382 } 383 384 static int __bch2_fs_read_write(struct bch_fs *c, bool early) 385 { 386 struct bch_dev *ca; 387 unsigned i; 388 int ret; 389 390 if (test_bit(BCH_FS_INITIAL_GC_UNFIXED, &c->flags)) { 391 bch_err(c, "cannot go rw, unfixed btree errors"); 392 return -BCH_ERR_erofs_unfixed_errors; 393 } 394 395 if (test_bit(BCH_FS_RW, &c->flags)) 396 return 0; 397 398 if (c->opts.norecovery) 399 return -BCH_ERR_erofs_norecovery; 400 401 /* 402 * nochanges is used for fsck -n mode - we have to allow going rw 403 * during recovery for that to work: 404 */ 405 if (c->opts.nochanges && (!early || c->opts.read_only)) 406 return -BCH_ERR_erofs_nochanges; 407 408 bch_info(c, "going read-write"); 409 410 ret = bch2_sb_members_v2_init(c); 411 if (ret) 412 goto err; 413 414 ret = bch2_fs_mark_dirty(c); 415 if (ret) 416 goto err; 417 418 clear_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags); 419 420 /* 421 * First journal write must be a flush write: after a clean shutdown we 422 * don't read the journal, so the first journal write may end up 423 * overwriting whatever was there previously, and there must always be 424 * at least one non-flush write in the journal or recovery will fail: 425 */ 426 set_bit(JOURNAL_NEED_FLUSH_WRITE, &c->journal.flags); 427 428 for_each_rw_member(ca, c, i) 429 bch2_dev_allocator_add(c, ca); 430 bch2_recalc_capacity(c); 431 432 set_bit(BCH_FS_RW, &c->flags); 433 set_bit(BCH_FS_WAS_RW, &c->flags); 434 435 #ifndef BCH_WRITE_REF_DEBUG 436 percpu_ref_reinit(&c->writes); 437 #else 438 for (i = 0; i < BCH_WRITE_REF_NR; i++) { 439 BUG_ON(atomic_long_read(&c->writes[i])); 440 atomic_long_inc(&c->writes[i]); 441 } 442 #endif 443 444 ret = bch2_gc_thread_start(c); 445 if (ret) { 446 bch_err(c, "error starting gc thread"); 447 return ret; 448 } 449 450 ret = bch2_journal_reclaim_start(&c->journal); 451 if (ret) 452 goto err; 453 454 if (!early) { 455 ret = bch2_fs_read_write_late(c); 456 if (ret) 457 goto err; 458 } 459 460 bch2_do_discards(c); 461 bch2_do_invalidates(c); 462 bch2_do_stripe_deletes(c); 463 bch2_do_pending_node_rewrites(c); 464 return 0; 465 err: 466 if (test_bit(BCH_FS_RW, &c->flags)) 467 bch2_fs_read_only(c); 468 else 469 __bch2_fs_read_only(c); 470 return ret; 471 } 472 473 int bch2_fs_read_write(struct bch_fs *c) 474 { 475 return __bch2_fs_read_write(c, false); 476 } 477 478 int bch2_fs_read_write_early(struct bch_fs *c) 479 { 480 lockdep_assert_held(&c->state_lock); 481 482 return __bch2_fs_read_write(c, true); 483 } 484 485 /* Filesystem startup/shutdown: */ 486 487 static void __bch2_fs_free(struct bch_fs *c) 488 { 489 unsigned i; 490 491 for (i = 0; i < BCH_TIME_STAT_NR; i++) 492 bch2_time_stats_exit(&c->times[i]); 493 494 bch2_free_pending_node_rewrites(c); 495 bch2_fs_sb_errors_exit(c); 496 bch2_fs_counters_exit(c); 497 bch2_fs_snapshots_exit(c); 498 bch2_fs_quota_exit(c); 499 bch2_fs_fs_io_direct_exit(c); 500 bch2_fs_fs_io_buffered_exit(c); 501 bch2_fs_fsio_exit(c); 502 bch2_fs_ec_exit(c); 503 bch2_fs_encryption_exit(c); 504 bch2_fs_nocow_locking_exit(c); 505 bch2_fs_io_write_exit(c); 506 bch2_fs_io_read_exit(c); 507 bch2_fs_buckets_waiting_for_journal_exit(c); 508 bch2_fs_btree_interior_update_exit(c); 509 bch2_fs_btree_iter_exit(c); 510 bch2_fs_btree_key_cache_exit(&c->btree_key_cache); 511 bch2_fs_btree_cache_exit(c); 512 bch2_fs_replicas_exit(c); 513 bch2_fs_journal_exit(&c->journal); 514 bch2_io_clock_exit(&c->io_clock[WRITE]); 515 bch2_io_clock_exit(&c->io_clock[READ]); 516 bch2_fs_compress_exit(c); 517 bch2_journal_keys_put_initial(c); 518 BUG_ON(atomic_read(&c->journal_keys.ref)); 519 bch2_fs_btree_write_buffer_exit(c); 520 percpu_free_rwsem(&c->mark_lock); 521 free_percpu(c->online_reserved); 522 523 darray_exit(&c->btree_roots_extra); 524 free_percpu(c->pcpu); 525 mempool_exit(&c->large_bkey_pool); 526 mempool_exit(&c->btree_bounce_pool); 527 bioset_exit(&c->btree_bio); 528 mempool_exit(&c->fill_iter); 529 #ifndef BCH_WRITE_REF_DEBUG 530 percpu_ref_exit(&c->writes); 531 #endif 532 kfree(rcu_dereference_protected(c->disk_groups, 1)); 533 kfree(c->journal_seq_blacklist_table); 534 kfree(c->unused_inode_hints); 535 536 if (c->write_ref_wq) 537 destroy_workqueue(c->write_ref_wq); 538 if (c->io_complete_wq) 539 destroy_workqueue(c->io_complete_wq); 540 if (c->copygc_wq) 541 destroy_workqueue(c->copygc_wq); 542 if (c->btree_io_complete_wq) 543 destroy_workqueue(c->btree_io_complete_wq); 544 if (c->btree_update_wq) 545 destroy_workqueue(c->btree_update_wq); 546 547 bch2_free_super(&c->disk_sb); 548 kvpfree(c, sizeof(*c)); 549 module_put(THIS_MODULE); 550 } 551 552 static void bch2_fs_release(struct kobject *kobj) 553 { 554 struct bch_fs *c = container_of(kobj, struct bch_fs, kobj); 555 556 __bch2_fs_free(c); 557 } 558 559 void __bch2_fs_stop(struct bch_fs *c) 560 { 561 struct bch_dev *ca; 562 unsigned i; 563 564 bch_verbose(c, "shutting down"); 565 566 set_bit(BCH_FS_STOPPING, &c->flags); 567 568 cancel_work_sync(&c->journal_seq_blacklist_gc_work); 569 570 down_write(&c->state_lock); 571 bch2_fs_read_only(c); 572 up_write(&c->state_lock); 573 574 for_each_member_device(ca, c, i) 575 if (ca->kobj.state_in_sysfs && 576 ca->disk_sb.bdev) 577 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs"); 578 579 if (c->kobj.state_in_sysfs) 580 kobject_del(&c->kobj); 581 582 bch2_fs_debug_exit(c); 583 bch2_fs_chardev_exit(c); 584 585 kobject_put(&c->counters_kobj); 586 kobject_put(&c->time_stats); 587 kobject_put(&c->opts_dir); 588 kobject_put(&c->internal); 589 590 /* btree prefetch might have kicked off reads in the background: */ 591 bch2_btree_flush_all_reads(c); 592 593 for_each_member_device(ca, c, i) 594 cancel_work_sync(&ca->io_error_work); 595 596 cancel_work_sync(&c->read_only_work); 597 } 598 599 void bch2_fs_free(struct bch_fs *c) 600 { 601 unsigned i; 602 603 mutex_lock(&bch_fs_list_lock); 604 list_del(&c->list); 605 mutex_unlock(&bch_fs_list_lock); 606 607 closure_sync(&c->cl); 608 closure_debug_destroy(&c->cl); 609 610 for (i = 0; i < c->sb.nr_devices; i++) { 611 struct bch_dev *ca = rcu_dereference_protected(c->devs[i], true); 612 613 if (ca) { 614 bch2_free_super(&ca->disk_sb); 615 bch2_dev_free(ca); 616 } 617 } 618 619 bch_verbose(c, "shutdown complete"); 620 621 kobject_put(&c->kobj); 622 } 623 624 void bch2_fs_stop(struct bch_fs *c) 625 { 626 __bch2_fs_stop(c); 627 bch2_fs_free(c); 628 } 629 630 static int bch2_fs_online(struct bch_fs *c) 631 { 632 struct bch_dev *ca; 633 unsigned i; 634 int ret = 0; 635 636 lockdep_assert_held(&bch_fs_list_lock); 637 638 if (__bch2_uuid_to_fs(c->sb.uuid)) { 639 bch_err(c, "filesystem UUID already open"); 640 return -EINVAL; 641 } 642 643 ret = bch2_fs_chardev_init(c); 644 if (ret) { 645 bch_err(c, "error creating character device"); 646 return ret; 647 } 648 649 bch2_fs_debug_init(c); 650 651 ret = kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) ?: 652 kobject_add(&c->internal, &c->kobj, "internal") ?: 653 kobject_add(&c->opts_dir, &c->kobj, "options") ?: 654 kobject_add(&c->time_stats, &c->kobj, "time_stats") ?: 655 kobject_add(&c->counters_kobj, &c->kobj, "counters") ?: 656 bch2_opts_create_sysfs_files(&c->opts_dir); 657 if (ret) { 658 bch_err(c, "error creating sysfs objects"); 659 return ret; 660 } 661 662 down_write(&c->state_lock); 663 664 for_each_member_device(ca, c, i) { 665 ret = bch2_dev_sysfs_online(c, ca); 666 if (ret) { 667 bch_err(c, "error creating sysfs objects"); 668 percpu_ref_put(&ca->ref); 669 goto err; 670 } 671 } 672 673 BUG_ON(!list_empty(&c->list)); 674 list_add(&c->list, &bch_fs_list); 675 err: 676 up_write(&c->state_lock); 677 return ret; 678 } 679 680 static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts) 681 { 682 struct bch_fs *c; 683 struct printbuf name = PRINTBUF; 684 unsigned i, iter_size; 685 int ret = 0; 686 687 c = kvpmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO); 688 if (!c) { 689 c = ERR_PTR(-BCH_ERR_ENOMEM_fs_alloc); 690 goto out; 691 } 692 693 __module_get(THIS_MODULE); 694 695 closure_init(&c->cl, NULL); 696 697 c->kobj.kset = bcachefs_kset; 698 kobject_init(&c->kobj, &bch2_fs_ktype); 699 kobject_init(&c->internal, &bch2_fs_internal_ktype); 700 kobject_init(&c->opts_dir, &bch2_fs_opts_dir_ktype); 701 kobject_init(&c->time_stats, &bch2_fs_time_stats_ktype); 702 kobject_init(&c->counters_kobj, &bch2_fs_counters_ktype); 703 704 c->minor = -1; 705 c->disk_sb.fs_sb = true; 706 707 init_rwsem(&c->state_lock); 708 mutex_init(&c->sb_lock); 709 mutex_init(&c->replicas_gc_lock); 710 mutex_init(&c->btree_root_lock); 711 INIT_WORK(&c->read_only_work, bch2_fs_read_only_work); 712 713 init_rwsem(&c->gc_lock); 714 mutex_init(&c->gc_gens_lock); 715 atomic_set(&c->journal_keys.ref, 1); 716 c->journal_keys.initial_ref_held = true; 717 718 for (i = 0; i < BCH_TIME_STAT_NR; i++) 719 bch2_time_stats_init(&c->times[i]); 720 721 bch2_fs_copygc_init(c); 722 bch2_fs_btree_key_cache_init_early(&c->btree_key_cache); 723 bch2_fs_btree_iter_init_early(c); 724 bch2_fs_btree_interior_update_init_early(c); 725 bch2_fs_allocator_background_init(c); 726 bch2_fs_allocator_foreground_init(c); 727 bch2_fs_rebalance_init(c); 728 bch2_fs_quota_init(c); 729 bch2_fs_ec_init_early(c); 730 bch2_fs_move_init(c); 731 bch2_fs_sb_errors_init_early(c); 732 733 INIT_LIST_HEAD(&c->list); 734 735 mutex_init(&c->usage_scratch_lock); 736 737 mutex_init(&c->bio_bounce_pages_lock); 738 mutex_init(&c->snapshot_table_lock); 739 init_rwsem(&c->snapshot_create_lock); 740 741 spin_lock_init(&c->btree_write_error_lock); 742 743 INIT_WORK(&c->journal_seq_blacklist_gc_work, 744 bch2_blacklist_entries_gc); 745 746 INIT_LIST_HEAD(&c->journal_iters); 747 748 INIT_LIST_HEAD(&c->fsck_error_msgs); 749 mutex_init(&c->fsck_error_msgs_lock); 750 751 seqcount_init(&c->gc_pos_lock); 752 753 seqcount_init(&c->usage_lock); 754 755 sema_init(&c->io_in_flight, 128); 756 757 INIT_LIST_HEAD(&c->vfs_inodes_list); 758 mutex_init(&c->vfs_inodes_lock); 759 760 c->copy_gc_enabled = 1; 761 c->rebalance.enabled = 1; 762 c->promote_whole_extents = true; 763 764 c->journal.flush_write_time = &c->times[BCH_TIME_journal_flush_write]; 765 c->journal.noflush_write_time = &c->times[BCH_TIME_journal_noflush_write]; 766 c->journal.blocked_time = &c->times[BCH_TIME_blocked_journal]; 767 c->journal.flush_seq_time = &c->times[BCH_TIME_journal_flush_seq]; 768 769 bch2_fs_btree_cache_init_early(&c->btree_cache); 770 771 mutex_init(&c->sectors_available_lock); 772 773 ret = percpu_init_rwsem(&c->mark_lock); 774 if (ret) 775 goto err; 776 777 mutex_lock(&c->sb_lock); 778 ret = bch2_sb_to_fs(c, sb); 779 mutex_unlock(&c->sb_lock); 780 781 if (ret) 782 goto err; 783 784 pr_uuid(&name, c->sb.user_uuid.b); 785 strscpy(c->name, name.buf, sizeof(c->name)); 786 printbuf_exit(&name); 787 788 ret = name.allocation_failure ? -BCH_ERR_ENOMEM_fs_name_alloc : 0; 789 if (ret) 790 goto err; 791 792 /* Compat: */ 793 if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 && 794 !BCH_SB_JOURNAL_FLUSH_DELAY(sb)) 795 SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000); 796 797 if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 && 798 !BCH_SB_JOURNAL_RECLAIM_DELAY(sb)) 799 SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 100); 800 801 c->opts = bch2_opts_default; 802 ret = bch2_opts_from_sb(&c->opts, sb); 803 if (ret) 804 goto err; 805 806 bch2_opts_apply(&c->opts, opts); 807 808 c->btree_key_cache_btrees |= 1U << BTREE_ID_alloc; 809 if (c->opts.inodes_use_key_cache) 810 c->btree_key_cache_btrees |= 1U << BTREE_ID_inodes; 811 c->btree_key_cache_btrees |= 1U << BTREE_ID_logged_ops; 812 813 c->block_bits = ilog2(block_sectors(c)); 814 c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c); 815 816 if (bch2_fs_init_fault("fs_alloc")) { 817 bch_err(c, "fs_alloc fault injected"); 818 ret = -EFAULT; 819 goto err; 820 } 821 822 iter_size = sizeof(struct sort_iter) + 823 (btree_blocks(c) + 1) * 2 * 824 sizeof(struct sort_iter_set); 825 826 c->inode_shard_bits = ilog2(roundup_pow_of_two(num_possible_cpus())); 827 828 if (!(c->btree_update_wq = alloc_workqueue("bcachefs", 829 WQ_FREEZABLE|WQ_UNBOUND|WQ_MEM_RECLAIM, 512)) || 830 !(c->btree_io_complete_wq = alloc_workqueue("bcachefs_btree_io", 831 WQ_FREEZABLE|WQ_MEM_RECLAIM, 1)) || 832 !(c->copygc_wq = alloc_workqueue("bcachefs_copygc", 833 WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) || 834 !(c->io_complete_wq = alloc_workqueue("bcachefs_io", 835 WQ_FREEZABLE|WQ_HIGHPRI|WQ_MEM_RECLAIM, 1)) || 836 !(c->write_ref_wq = alloc_workqueue("bcachefs_write_ref", 837 WQ_FREEZABLE, 0)) || 838 #ifndef BCH_WRITE_REF_DEBUG 839 percpu_ref_init(&c->writes, bch2_writes_disabled, 840 PERCPU_REF_INIT_DEAD, GFP_KERNEL) || 841 #endif 842 mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) || 843 bioset_init(&c->btree_bio, 1, 844 max(offsetof(struct btree_read_bio, bio), 845 offsetof(struct btree_write_bio, wbio.bio)), 846 BIOSET_NEED_BVECS) || 847 !(c->pcpu = alloc_percpu(struct bch_fs_pcpu)) || 848 !(c->online_reserved = alloc_percpu(u64)) || 849 mempool_init_kvpmalloc_pool(&c->btree_bounce_pool, 1, 850 btree_bytes(c)) || 851 mempool_init_kmalloc_pool(&c->large_bkey_pool, 1, 2048) || 852 !(c->unused_inode_hints = kcalloc(1U << c->inode_shard_bits, 853 sizeof(u64), GFP_KERNEL))) { 854 ret = -BCH_ERR_ENOMEM_fs_other_alloc; 855 goto err; 856 } 857 858 ret = bch2_fs_counters_init(c) ?: 859 bch2_fs_sb_errors_init(c) ?: 860 bch2_io_clock_init(&c->io_clock[READ]) ?: 861 bch2_io_clock_init(&c->io_clock[WRITE]) ?: 862 bch2_fs_journal_init(&c->journal) ?: 863 bch2_fs_replicas_init(c) ?: 864 bch2_fs_btree_cache_init(c) ?: 865 bch2_fs_btree_key_cache_init(&c->btree_key_cache) ?: 866 bch2_fs_btree_iter_init(c) ?: 867 bch2_fs_btree_interior_update_init(c) ?: 868 bch2_fs_buckets_waiting_for_journal_init(c) ?: 869 bch2_fs_btree_write_buffer_init(c) ?: 870 bch2_fs_subvolumes_init(c) ?: 871 bch2_fs_io_read_init(c) ?: 872 bch2_fs_io_write_init(c) ?: 873 bch2_fs_nocow_locking_init(c) ?: 874 bch2_fs_encryption_init(c) ?: 875 bch2_fs_compress_init(c) ?: 876 bch2_fs_ec_init(c) ?: 877 bch2_fs_fsio_init(c) ?: 878 bch2_fs_fs_io_buffered_init(c) ?: 879 bch2_fs_fs_io_direct_init(c); 880 if (ret) 881 goto err; 882 883 for (i = 0; i < c->sb.nr_devices; i++) 884 if (bch2_dev_exists(c->disk_sb.sb, i) && 885 bch2_dev_alloc(c, i)) { 886 ret = -EEXIST; 887 goto err; 888 } 889 890 bch2_journal_entry_res_resize(&c->journal, 891 &c->btree_root_journal_res, 892 BTREE_ID_NR * (JSET_KEYS_U64s + BKEY_BTREE_PTR_U64s_MAX)); 893 bch2_dev_usage_journal_reserve(c); 894 bch2_journal_entry_res_resize(&c->journal, 895 &c->clock_journal_res, 896 (sizeof(struct jset_entry_clock) / sizeof(u64)) * 2); 897 898 mutex_lock(&bch_fs_list_lock); 899 ret = bch2_fs_online(c); 900 mutex_unlock(&bch_fs_list_lock); 901 902 if (ret) 903 goto err; 904 out: 905 return c; 906 err: 907 bch2_fs_free(c); 908 c = ERR_PTR(ret); 909 goto out; 910 } 911 912 noinline_for_stack 913 static void print_mount_opts(struct bch_fs *c) 914 { 915 enum bch_opt_id i; 916 struct printbuf p = PRINTBUF; 917 bool first = true; 918 919 prt_str(&p, "mounting version "); 920 bch2_version_to_text(&p, c->sb.version); 921 922 if (c->opts.read_only) { 923 prt_str(&p, " opts="); 924 first = false; 925 prt_printf(&p, "ro"); 926 } 927 928 for (i = 0; i < bch2_opts_nr; i++) { 929 const struct bch_option *opt = &bch2_opt_table[i]; 930 u64 v = bch2_opt_get_by_id(&c->opts, i); 931 932 if (!(opt->flags & OPT_MOUNT)) 933 continue; 934 935 if (v == bch2_opt_get_by_id(&bch2_opts_default, i)) 936 continue; 937 938 prt_str(&p, first ? " opts=" : ","); 939 first = false; 940 bch2_opt_to_text(&p, c, c->disk_sb.sb, opt, v, OPT_SHOW_MOUNT_STYLE); 941 } 942 943 bch_info(c, "%s", p.buf); 944 printbuf_exit(&p); 945 } 946 947 int bch2_fs_start(struct bch_fs *c) 948 { 949 struct bch_dev *ca; 950 time64_t now = ktime_get_real_seconds(); 951 unsigned i; 952 int ret; 953 954 print_mount_opts(c); 955 956 down_write(&c->state_lock); 957 958 BUG_ON(test_bit(BCH_FS_STARTED, &c->flags)); 959 960 mutex_lock(&c->sb_lock); 961 962 ret = bch2_sb_members_v2_init(c); 963 if (ret) { 964 mutex_unlock(&c->sb_lock); 965 goto err; 966 } 967 968 for_each_online_member(ca, c, i) 969 bch2_members_v2_get_mut(c->disk_sb.sb, i)->last_mount = cpu_to_le64(now); 970 971 mutex_unlock(&c->sb_lock); 972 973 for_each_rw_member(ca, c, i) 974 bch2_dev_allocator_add(c, ca); 975 bch2_recalc_capacity(c); 976 977 ret = BCH_SB_INITIALIZED(c->disk_sb.sb) 978 ? bch2_fs_recovery(c) 979 : bch2_fs_initialize(c); 980 if (ret) 981 goto err; 982 983 ret = bch2_opts_check_may_set(c); 984 if (ret) 985 goto err; 986 987 if (bch2_fs_init_fault("fs_start")) { 988 bch_err(c, "fs_start fault injected"); 989 ret = -EINVAL; 990 goto err; 991 } 992 993 set_bit(BCH_FS_STARTED, &c->flags); 994 995 if (c->opts.read_only || c->opts.nochanges) { 996 bch2_fs_read_only(c); 997 } else { 998 ret = !test_bit(BCH_FS_RW, &c->flags) 999 ? bch2_fs_read_write(c) 1000 : bch2_fs_read_write_late(c); 1001 if (ret) 1002 goto err; 1003 } 1004 1005 ret = 0; 1006 out: 1007 up_write(&c->state_lock); 1008 return ret; 1009 err: 1010 bch_err_msg(c, ret, "starting filesystem"); 1011 goto out; 1012 } 1013 1014 static int bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c) 1015 { 1016 struct bch_member m = bch2_sb_member_get(sb, sb->dev_idx); 1017 1018 if (le16_to_cpu(sb->block_size) != block_sectors(c)) 1019 return -BCH_ERR_mismatched_block_size; 1020 1021 if (le16_to_cpu(m.bucket_size) < 1022 BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb)) 1023 return -BCH_ERR_bucket_size_too_small; 1024 1025 return 0; 1026 } 1027 1028 static int bch2_dev_in_fs(struct bch_sb *fs, struct bch_sb *sb) 1029 { 1030 struct bch_sb *newest = 1031 le64_to_cpu(fs->seq) > le64_to_cpu(sb->seq) ? fs : sb; 1032 1033 if (!uuid_equal(&fs->uuid, &sb->uuid)) 1034 return -BCH_ERR_device_not_a_member_of_filesystem; 1035 1036 if (!bch2_dev_exists(newest, sb->dev_idx)) 1037 return -BCH_ERR_device_has_been_removed; 1038 1039 if (fs->block_size != sb->block_size) 1040 return -BCH_ERR_mismatched_block_size; 1041 1042 return 0; 1043 } 1044 1045 /* Device startup/shutdown: */ 1046 1047 static void bch2_dev_release(struct kobject *kobj) 1048 { 1049 struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj); 1050 1051 kfree(ca); 1052 } 1053 1054 static void bch2_dev_free(struct bch_dev *ca) 1055 { 1056 cancel_work_sync(&ca->io_error_work); 1057 1058 if (ca->kobj.state_in_sysfs && 1059 ca->disk_sb.bdev) 1060 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs"); 1061 1062 if (ca->kobj.state_in_sysfs) 1063 kobject_del(&ca->kobj); 1064 1065 bch2_free_super(&ca->disk_sb); 1066 bch2_dev_journal_exit(ca); 1067 1068 free_percpu(ca->io_done); 1069 bioset_exit(&ca->replica_set); 1070 bch2_dev_buckets_free(ca); 1071 free_page((unsigned long) ca->sb_read_scratch); 1072 1073 bch2_time_stats_exit(&ca->io_latency[WRITE]); 1074 bch2_time_stats_exit(&ca->io_latency[READ]); 1075 1076 percpu_ref_exit(&ca->io_ref); 1077 percpu_ref_exit(&ca->ref); 1078 kobject_put(&ca->kobj); 1079 } 1080 1081 static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca) 1082 { 1083 1084 lockdep_assert_held(&c->state_lock); 1085 1086 if (percpu_ref_is_zero(&ca->io_ref)) 1087 return; 1088 1089 __bch2_dev_read_only(c, ca); 1090 1091 reinit_completion(&ca->io_ref_completion); 1092 percpu_ref_kill(&ca->io_ref); 1093 wait_for_completion(&ca->io_ref_completion); 1094 1095 if (ca->kobj.state_in_sysfs) { 1096 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs"); 1097 sysfs_remove_link(&ca->kobj, "block"); 1098 } 1099 1100 bch2_free_super(&ca->disk_sb); 1101 bch2_dev_journal_exit(ca); 1102 } 1103 1104 static void bch2_dev_ref_complete(struct percpu_ref *ref) 1105 { 1106 struct bch_dev *ca = container_of(ref, struct bch_dev, ref); 1107 1108 complete(&ca->ref_completion); 1109 } 1110 1111 static void bch2_dev_io_ref_complete(struct percpu_ref *ref) 1112 { 1113 struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref); 1114 1115 complete(&ca->io_ref_completion); 1116 } 1117 1118 static int bch2_dev_sysfs_online(struct bch_fs *c, struct bch_dev *ca) 1119 { 1120 int ret; 1121 1122 if (!c->kobj.state_in_sysfs) 1123 return 0; 1124 1125 if (!ca->kobj.state_in_sysfs) { 1126 ret = kobject_add(&ca->kobj, &c->kobj, 1127 "dev-%u", ca->dev_idx); 1128 if (ret) 1129 return ret; 1130 } 1131 1132 if (ca->disk_sb.bdev) { 1133 struct kobject *block = bdev_kobj(ca->disk_sb.bdev); 1134 1135 ret = sysfs_create_link(block, &ca->kobj, "bcachefs"); 1136 if (ret) 1137 return ret; 1138 1139 ret = sysfs_create_link(&ca->kobj, block, "block"); 1140 if (ret) 1141 return ret; 1142 } 1143 1144 return 0; 1145 } 1146 1147 static struct bch_dev *__bch2_dev_alloc(struct bch_fs *c, 1148 struct bch_member *member) 1149 { 1150 struct bch_dev *ca; 1151 unsigned i; 1152 1153 ca = kzalloc(sizeof(*ca), GFP_KERNEL); 1154 if (!ca) 1155 return NULL; 1156 1157 kobject_init(&ca->kobj, &bch2_dev_ktype); 1158 init_completion(&ca->ref_completion); 1159 init_completion(&ca->io_ref_completion); 1160 1161 init_rwsem(&ca->bucket_lock); 1162 1163 INIT_WORK(&ca->io_error_work, bch2_io_error_work); 1164 1165 bch2_time_stats_init(&ca->io_latency[READ]); 1166 bch2_time_stats_init(&ca->io_latency[WRITE]); 1167 1168 ca->mi = bch2_mi_to_cpu(member); 1169 1170 for (i = 0; i < ARRAY_SIZE(member->errors); i++) 1171 atomic64_set(&ca->errors[i], le64_to_cpu(member->errors[i])); 1172 1173 ca->uuid = member->uuid; 1174 1175 ca->nr_btree_reserve = DIV_ROUND_UP(BTREE_NODE_RESERVE, 1176 ca->mi.bucket_size / btree_sectors(c)); 1177 1178 if (percpu_ref_init(&ca->ref, bch2_dev_ref_complete, 1179 0, GFP_KERNEL) || 1180 percpu_ref_init(&ca->io_ref, bch2_dev_io_ref_complete, 1181 PERCPU_REF_INIT_DEAD, GFP_KERNEL) || 1182 !(ca->sb_read_scratch = (void *) __get_free_page(GFP_KERNEL)) || 1183 bch2_dev_buckets_alloc(c, ca) || 1184 bioset_init(&ca->replica_set, 4, 1185 offsetof(struct bch_write_bio, bio), 0) || 1186 !(ca->io_done = alloc_percpu(*ca->io_done))) 1187 goto err; 1188 1189 return ca; 1190 err: 1191 bch2_dev_free(ca); 1192 return NULL; 1193 } 1194 1195 static void bch2_dev_attach(struct bch_fs *c, struct bch_dev *ca, 1196 unsigned dev_idx) 1197 { 1198 ca->dev_idx = dev_idx; 1199 __set_bit(ca->dev_idx, ca->self.d); 1200 scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx); 1201 1202 ca->fs = c; 1203 rcu_assign_pointer(c->devs[ca->dev_idx], ca); 1204 1205 if (bch2_dev_sysfs_online(c, ca)) 1206 pr_warn("error creating sysfs objects"); 1207 } 1208 1209 static int bch2_dev_alloc(struct bch_fs *c, unsigned dev_idx) 1210 { 1211 struct bch_member member = bch2_sb_member_get(c->disk_sb.sb, dev_idx); 1212 struct bch_dev *ca = NULL; 1213 int ret = 0; 1214 1215 if (bch2_fs_init_fault("dev_alloc")) 1216 goto err; 1217 1218 ca = __bch2_dev_alloc(c, &member); 1219 if (!ca) 1220 goto err; 1221 1222 ca->fs = c; 1223 1224 bch2_dev_attach(c, ca, dev_idx); 1225 return ret; 1226 err: 1227 if (ca) 1228 bch2_dev_free(ca); 1229 return -BCH_ERR_ENOMEM_dev_alloc; 1230 } 1231 1232 static int __bch2_dev_attach_bdev(struct bch_dev *ca, struct bch_sb_handle *sb) 1233 { 1234 unsigned ret; 1235 1236 if (bch2_dev_is_online(ca)) { 1237 bch_err(ca, "already have device online in slot %u", 1238 sb->sb->dev_idx); 1239 return -BCH_ERR_device_already_online; 1240 } 1241 1242 if (get_capacity(sb->bdev->bd_disk) < 1243 ca->mi.bucket_size * ca->mi.nbuckets) { 1244 bch_err(ca, "cannot online: device too small"); 1245 return -BCH_ERR_device_size_too_small; 1246 } 1247 1248 BUG_ON(!percpu_ref_is_zero(&ca->io_ref)); 1249 1250 ret = bch2_dev_journal_init(ca, sb->sb); 1251 if (ret) 1252 return ret; 1253 1254 /* Commit: */ 1255 ca->disk_sb = *sb; 1256 memset(sb, 0, sizeof(*sb)); 1257 1258 ca->dev = ca->disk_sb.bdev->bd_dev; 1259 1260 percpu_ref_reinit(&ca->io_ref); 1261 1262 return 0; 1263 } 1264 1265 static int bch2_dev_attach_bdev(struct bch_fs *c, struct bch_sb_handle *sb) 1266 { 1267 struct bch_dev *ca; 1268 int ret; 1269 1270 lockdep_assert_held(&c->state_lock); 1271 1272 if (le64_to_cpu(sb->sb->seq) > 1273 le64_to_cpu(c->disk_sb.sb->seq)) 1274 bch2_sb_to_fs(c, sb->sb); 1275 1276 BUG_ON(sb->sb->dev_idx >= c->sb.nr_devices || 1277 !c->devs[sb->sb->dev_idx]); 1278 1279 ca = bch_dev_locked(c, sb->sb->dev_idx); 1280 1281 ret = __bch2_dev_attach_bdev(ca, sb); 1282 if (ret) 1283 return ret; 1284 1285 bch2_dev_sysfs_online(c, ca); 1286 1287 if (c->sb.nr_devices == 1) 1288 snprintf(c->name, sizeof(c->name), "%pg", ca->disk_sb.bdev); 1289 snprintf(ca->name, sizeof(ca->name), "%pg", ca->disk_sb.bdev); 1290 1291 rebalance_wakeup(c); 1292 return 0; 1293 } 1294 1295 /* Device management: */ 1296 1297 /* 1298 * Note: this function is also used by the error paths - when a particular 1299 * device sees an error, we call it to determine whether we can just set the 1300 * device RO, or - if this function returns false - we'll set the whole 1301 * filesystem RO: 1302 * 1303 * XXX: maybe we should be more explicit about whether we're changing state 1304 * because we got an error or what have you? 1305 */ 1306 bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca, 1307 enum bch_member_state new_state, int flags) 1308 { 1309 struct bch_devs_mask new_online_devs; 1310 struct bch_dev *ca2; 1311 int i, nr_rw = 0, required; 1312 1313 lockdep_assert_held(&c->state_lock); 1314 1315 switch (new_state) { 1316 case BCH_MEMBER_STATE_rw: 1317 return true; 1318 case BCH_MEMBER_STATE_ro: 1319 if (ca->mi.state != BCH_MEMBER_STATE_rw) 1320 return true; 1321 1322 /* do we have enough devices to write to? */ 1323 for_each_member_device(ca2, c, i) 1324 if (ca2 != ca) 1325 nr_rw += ca2->mi.state == BCH_MEMBER_STATE_rw; 1326 1327 required = max(!(flags & BCH_FORCE_IF_METADATA_DEGRADED) 1328 ? c->opts.metadata_replicas 1329 : c->opts.metadata_replicas_required, 1330 !(flags & BCH_FORCE_IF_DATA_DEGRADED) 1331 ? c->opts.data_replicas 1332 : c->opts.data_replicas_required); 1333 1334 return nr_rw >= required; 1335 case BCH_MEMBER_STATE_failed: 1336 case BCH_MEMBER_STATE_spare: 1337 if (ca->mi.state != BCH_MEMBER_STATE_rw && 1338 ca->mi.state != BCH_MEMBER_STATE_ro) 1339 return true; 1340 1341 /* do we have enough devices to read from? */ 1342 new_online_devs = bch2_online_devs(c); 1343 __clear_bit(ca->dev_idx, new_online_devs.d); 1344 1345 return bch2_have_enough_devs(c, new_online_devs, flags, false); 1346 default: 1347 BUG(); 1348 } 1349 } 1350 1351 static bool bch2_fs_may_start(struct bch_fs *c) 1352 { 1353 struct bch_dev *ca; 1354 unsigned i, flags = 0; 1355 1356 if (c->opts.very_degraded) 1357 flags |= BCH_FORCE_IF_DEGRADED|BCH_FORCE_IF_LOST; 1358 1359 if (c->opts.degraded) 1360 flags |= BCH_FORCE_IF_DEGRADED; 1361 1362 if (!c->opts.degraded && 1363 !c->opts.very_degraded) { 1364 mutex_lock(&c->sb_lock); 1365 1366 for (i = 0; i < c->disk_sb.sb->nr_devices; i++) { 1367 if (!bch2_dev_exists(c->disk_sb.sb, i)) 1368 continue; 1369 1370 ca = bch_dev_locked(c, i); 1371 1372 if (!bch2_dev_is_online(ca) && 1373 (ca->mi.state == BCH_MEMBER_STATE_rw || 1374 ca->mi.state == BCH_MEMBER_STATE_ro)) { 1375 mutex_unlock(&c->sb_lock); 1376 return false; 1377 } 1378 } 1379 mutex_unlock(&c->sb_lock); 1380 } 1381 1382 return bch2_have_enough_devs(c, bch2_online_devs(c), flags, true); 1383 } 1384 1385 static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca) 1386 { 1387 /* 1388 * The allocator thread itself allocates btree nodes, so stop it first: 1389 */ 1390 bch2_dev_allocator_remove(c, ca); 1391 bch2_dev_journal_stop(&c->journal, ca); 1392 } 1393 1394 static void __bch2_dev_read_write(struct bch_fs *c, struct bch_dev *ca) 1395 { 1396 lockdep_assert_held(&c->state_lock); 1397 1398 BUG_ON(ca->mi.state != BCH_MEMBER_STATE_rw); 1399 1400 bch2_dev_allocator_add(c, ca); 1401 bch2_recalc_capacity(c); 1402 } 1403 1404 int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca, 1405 enum bch_member_state new_state, int flags) 1406 { 1407 struct bch_member *m; 1408 int ret = 0; 1409 1410 if (ca->mi.state == new_state) 1411 return 0; 1412 1413 if (!bch2_dev_state_allowed(c, ca, new_state, flags)) 1414 return -BCH_ERR_device_state_not_allowed; 1415 1416 if (new_state != BCH_MEMBER_STATE_rw) 1417 __bch2_dev_read_only(c, ca); 1418 1419 bch_notice(ca, "%s", bch2_member_states[new_state]); 1420 1421 mutex_lock(&c->sb_lock); 1422 m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx); 1423 SET_BCH_MEMBER_STATE(m, new_state); 1424 bch2_write_super(c); 1425 mutex_unlock(&c->sb_lock); 1426 1427 if (new_state == BCH_MEMBER_STATE_rw) 1428 __bch2_dev_read_write(c, ca); 1429 1430 rebalance_wakeup(c); 1431 1432 return ret; 1433 } 1434 1435 int bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca, 1436 enum bch_member_state new_state, int flags) 1437 { 1438 int ret; 1439 1440 down_write(&c->state_lock); 1441 ret = __bch2_dev_set_state(c, ca, new_state, flags); 1442 up_write(&c->state_lock); 1443 1444 return ret; 1445 } 1446 1447 /* Device add/removal: */ 1448 1449 static int bch2_dev_remove_alloc(struct bch_fs *c, struct bch_dev *ca) 1450 { 1451 struct bpos start = POS(ca->dev_idx, 0); 1452 struct bpos end = POS(ca->dev_idx, U64_MAX); 1453 int ret; 1454 1455 /* 1456 * We clear the LRU and need_discard btrees first so that we don't race 1457 * with bch2_do_invalidates() and bch2_do_discards() 1458 */ 1459 ret = bch2_btree_delete_range(c, BTREE_ID_lru, start, end, 1460 BTREE_TRIGGER_NORUN, NULL) ?: 1461 bch2_btree_delete_range(c, BTREE_ID_need_discard, start, end, 1462 BTREE_TRIGGER_NORUN, NULL) ?: 1463 bch2_btree_delete_range(c, BTREE_ID_freespace, start, end, 1464 BTREE_TRIGGER_NORUN, NULL) ?: 1465 bch2_btree_delete_range(c, BTREE_ID_backpointers, start, end, 1466 BTREE_TRIGGER_NORUN, NULL) ?: 1467 bch2_btree_delete_range(c, BTREE_ID_alloc, start, end, 1468 BTREE_TRIGGER_NORUN, NULL) ?: 1469 bch2_btree_delete_range(c, BTREE_ID_bucket_gens, start, end, 1470 BTREE_TRIGGER_NORUN, NULL); 1471 if (ret) 1472 bch_err_msg(c, ret, "removing dev alloc info"); 1473 1474 return ret; 1475 } 1476 1477 int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags) 1478 { 1479 struct bch_member *m; 1480 unsigned dev_idx = ca->dev_idx, data; 1481 int ret; 1482 1483 down_write(&c->state_lock); 1484 1485 /* 1486 * We consume a reference to ca->ref, regardless of whether we succeed 1487 * or fail: 1488 */ 1489 percpu_ref_put(&ca->ref); 1490 1491 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) { 1492 bch_err(ca, "Cannot remove without losing data"); 1493 ret = -BCH_ERR_device_state_not_allowed; 1494 goto err; 1495 } 1496 1497 __bch2_dev_read_only(c, ca); 1498 1499 ret = bch2_dev_data_drop(c, ca->dev_idx, flags); 1500 if (ret) { 1501 bch_err_msg(ca, ret, "dropping data"); 1502 goto err; 1503 } 1504 1505 ret = bch2_dev_remove_alloc(c, ca); 1506 if (ret) { 1507 bch_err_msg(ca, ret, "deleting alloc info"); 1508 goto err; 1509 } 1510 1511 ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx); 1512 if (ret) { 1513 bch_err_msg(ca, ret, "flushing journal"); 1514 goto err; 1515 } 1516 1517 ret = bch2_journal_flush(&c->journal); 1518 if (ret) { 1519 bch_err(ca, "journal error"); 1520 goto err; 1521 } 1522 1523 ret = bch2_replicas_gc2(c); 1524 if (ret) { 1525 bch_err_msg(ca, ret, "in replicas_gc2()"); 1526 goto err; 1527 } 1528 1529 data = bch2_dev_has_data(c, ca); 1530 if (data) { 1531 struct printbuf data_has = PRINTBUF; 1532 1533 prt_bitflags(&data_has, bch2_data_types, data); 1534 bch_err(ca, "Remove failed, still has data (%s)", data_has.buf); 1535 printbuf_exit(&data_has); 1536 ret = -EBUSY; 1537 goto err; 1538 } 1539 1540 __bch2_dev_offline(c, ca); 1541 1542 mutex_lock(&c->sb_lock); 1543 rcu_assign_pointer(c->devs[ca->dev_idx], NULL); 1544 mutex_unlock(&c->sb_lock); 1545 1546 percpu_ref_kill(&ca->ref); 1547 wait_for_completion(&ca->ref_completion); 1548 1549 bch2_dev_free(ca); 1550 1551 /* 1552 * At this point the device object has been removed in-core, but the 1553 * on-disk journal might still refer to the device index via sb device 1554 * usage entries. Recovery fails if it sees usage information for an 1555 * invalid device. Flush journal pins to push the back of the journal 1556 * past now invalid device index references before we update the 1557 * superblock, but after the device object has been removed so any 1558 * further journal writes elide usage info for the device. 1559 */ 1560 bch2_journal_flush_all_pins(&c->journal); 1561 1562 /* 1563 * Free this device's slot in the bch_member array - all pointers to 1564 * this device must be gone: 1565 */ 1566 mutex_lock(&c->sb_lock); 1567 m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx); 1568 memset(&m->uuid, 0, sizeof(m->uuid)); 1569 1570 bch2_write_super(c); 1571 1572 mutex_unlock(&c->sb_lock); 1573 up_write(&c->state_lock); 1574 1575 bch2_dev_usage_journal_reserve(c); 1576 return 0; 1577 err: 1578 if (ca->mi.state == BCH_MEMBER_STATE_rw && 1579 !percpu_ref_is_zero(&ca->io_ref)) 1580 __bch2_dev_read_write(c, ca); 1581 up_write(&c->state_lock); 1582 return ret; 1583 } 1584 1585 /* Add new device to running filesystem: */ 1586 int bch2_dev_add(struct bch_fs *c, const char *path) 1587 { 1588 struct bch_opts opts = bch2_opts_empty(); 1589 struct bch_sb_handle sb; 1590 struct bch_dev *ca = NULL; 1591 struct bch_sb_field_members_v2 *mi; 1592 struct bch_member dev_mi; 1593 unsigned dev_idx, nr_devices, u64s; 1594 struct printbuf errbuf = PRINTBUF; 1595 struct printbuf label = PRINTBUF; 1596 int ret; 1597 1598 ret = bch2_read_super(path, &opts, &sb); 1599 if (ret) { 1600 bch_err_msg(c, ret, "reading super"); 1601 goto err; 1602 } 1603 1604 dev_mi = bch2_sb_member_get(sb.sb, sb.sb->dev_idx); 1605 1606 if (BCH_MEMBER_GROUP(&dev_mi)) { 1607 bch2_disk_path_to_text_sb(&label, sb.sb, BCH_MEMBER_GROUP(&dev_mi) - 1); 1608 if (label.allocation_failure) { 1609 ret = -ENOMEM; 1610 goto err; 1611 } 1612 } 1613 1614 ret = bch2_dev_may_add(sb.sb, c); 1615 if (ret) { 1616 bch_err_fn(c, ret); 1617 goto err; 1618 } 1619 1620 ca = __bch2_dev_alloc(c, &dev_mi); 1621 if (!ca) { 1622 ret = -ENOMEM; 1623 goto err; 1624 } 1625 1626 bch2_dev_usage_init(ca); 1627 1628 ret = __bch2_dev_attach_bdev(ca, &sb); 1629 if (ret) 1630 goto err; 1631 1632 ret = bch2_dev_journal_alloc(ca); 1633 if (ret) { 1634 bch_err_msg(c, ret, "allocating journal"); 1635 goto err; 1636 } 1637 1638 down_write(&c->state_lock); 1639 mutex_lock(&c->sb_lock); 1640 1641 ret = bch2_sb_from_fs(c, ca); 1642 if (ret) { 1643 bch_err_msg(c, ret, "setting up new superblock"); 1644 goto err_unlock; 1645 } 1646 1647 if (dynamic_fault("bcachefs:add:no_slot")) 1648 goto no_slot; 1649 1650 for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++) 1651 if (!bch2_dev_exists(c->disk_sb.sb, dev_idx)) 1652 goto have_slot; 1653 no_slot: 1654 ret = -BCH_ERR_ENOSPC_sb_members; 1655 bch_err_msg(c, ret, "setting up new superblock"); 1656 goto err_unlock; 1657 1658 have_slot: 1659 nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices); 1660 1661 mi = bch2_sb_field_get(c->disk_sb.sb, members_v2); 1662 u64s = DIV_ROUND_UP(sizeof(struct bch_sb_field_members_v2) + 1663 le16_to_cpu(mi->member_bytes) * nr_devices, sizeof(u64)); 1664 1665 mi = bch2_sb_field_resize(&c->disk_sb, members_v2, u64s); 1666 if (!mi) { 1667 ret = -BCH_ERR_ENOSPC_sb_members; 1668 bch_err_msg(c, ret, "setting up new superblock"); 1669 goto err_unlock; 1670 } 1671 struct bch_member *m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx); 1672 1673 /* success: */ 1674 1675 *m = dev_mi; 1676 m->last_mount = cpu_to_le64(ktime_get_real_seconds()); 1677 c->disk_sb.sb->nr_devices = nr_devices; 1678 1679 ca->disk_sb.sb->dev_idx = dev_idx; 1680 bch2_dev_attach(c, ca, dev_idx); 1681 1682 if (BCH_MEMBER_GROUP(&dev_mi)) { 1683 ret = __bch2_dev_group_set(c, ca, label.buf); 1684 if (ret) { 1685 bch_err_msg(c, ret, "creating new label"); 1686 goto err_unlock; 1687 } 1688 } 1689 1690 bch2_write_super(c); 1691 mutex_unlock(&c->sb_lock); 1692 1693 bch2_dev_usage_journal_reserve(c); 1694 1695 ret = bch2_trans_mark_dev_sb(c, ca); 1696 if (ret) { 1697 bch_err_msg(ca, ret, "marking new superblock"); 1698 goto err_late; 1699 } 1700 1701 ret = bch2_fs_freespace_init(c); 1702 if (ret) { 1703 bch_err_msg(ca, ret, "initializing free space"); 1704 goto err_late; 1705 } 1706 1707 ca->new_fs_bucket_idx = 0; 1708 1709 if (ca->mi.state == BCH_MEMBER_STATE_rw) 1710 __bch2_dev_read_write(c, ca); 1711 1712 up_write(&c->state_lock); 1713 return 0; 1714 1715 err_unlock: 1716 mutex_unlock(&c->sb_lock); 1717 up_write(&c->state_lock); 1718 err: 1719 if (ca) 1720 bch2_dev_free(ca); 1721 bch2_free_super(&sb); 1722 printbuf_exit(&label); 1723 printbuf_exit(&errbuf); 1724 return ret; 1725 err_late: 1726 up_write(&c->state_lock); 1727 ca = NULL; 1728 goto err; 1729 } 1730 1731 /* Hot add existing device to running filesystem: */ 1732 int bch2_dev_online(struct bch_fs *c, const char *path) 1733 { 1734 struct bch_opts opts = bch2_opts_empty(); 1735 struct bch_sb_handle sb = { NULL }; 1736 struct bch_dev *ca; 1737 unsigned dev_idx; 1738 int ret; 1739 1740 down_write(&c->state_lock); 1741 1742 ret = bch2_read_super(path, &opts, &sb); 1743 if (ret) { 1744 up_write(&c->state_lock); 1745 return ret; 1746 } 1747 1748 dev_idx = sb.sb->dev_idx; 1749 1750 ret = bch2_dev_in_fs(c->disk_sb.sb, sb.sb); 1751 if (ret) { 1752 bch_err_msg(c, ret, "bringing %s online", path); 1753 goto err; 1754 } 1755 1756 ret = bch2_dev_attach_bdev(c, &sb); 1757 if (ret) 1758 goto err; 1759 1760 ca = bch_dev_locked(c, dev_idx); 1761 1762 ret = bch2_trans_mark_dev_sb(c, ca); 1763 if (ret) { 1764 bch_err_msg(c, ret, "bringing %s online: error from bch2_trans_mark_dev_sb", path); 1765 goto err; 1766 } 1767 1768 if (ca->mi.state == BCH_MEMBER_STATE_rw) 1769 __bch2_dev_read_write(c, ca); 1770 1771 if (!ca->mi.freespace_initialized) { 1772 ret = bch2_dev_freespace_init(c, ca, 0, ca->mi.nbuckets); 1773 bch_err_msg(ca, ret, "initializing free space"); 1774 if (ret) 1775 goto err; 1776 } 1777 1778 if (!ca->journal.nr) { 1779 ret = bch2_dev_journal_alloc(ca); 1780 bch_err_msg(ca, ret, "allocating journal"); 1781 if (ret) 1782 goto err; 1783 } 1784 1785 mutex_lock(&c->sb_lock); 1786 bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount = 1787 cpu_to_le64(ktime_get_real_seconds()); 1788 bch2_write_super(c); 1789 mutex_unlock(&c->sb_lock); 1790 1791 up_write(&c->state_lock); 1792 return 0; 1793 err: 1794 up_write(&c->state_lock); 1795 bch2_free_super(&sb); 1796 return ret; 1797 } 1798 1799 int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags) 1800 { 1801 down_write(&c->state_lock); 1802 1803 if (!bch2_dev_is_online(ca)) { 1804 bch_err(ca, "Already offline"); 1805 up_write(&c->state_lock); 1806 return 0; 1807 } 1808 1809 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) { 1810 bch_err(ca, "Cannot offline required disk"); 1811 up_write(&c->state_lock); 1812 return -BCH_ERR_device_state_not_allowed; 1813 } 1814 1815 __bch2_dev_offline(c, ca); 1816 1817 up_write(&c->state_lock); 1818 return 0; 1819 } 1820 1821 int bch2_dev_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets) 1822 { 1823 struct bch_member *m; 1824 u64 old_nbuckets; 1825 int ret = 0; 1826 1827 down_write(&c->state_lock); 1828 old_nbuckets = ca->mi.nbuckets; 1829 1830 if (nbuckets < ca->mi.nbuckets) { 1831 bch_err(ca, "Cannot shrink yet"); 1832 ret = -EINVAL; 1833 goto err; 1834 } 1835 1836 if (bch2_dev_is_online(ca) && 1837 get_capacity(ca->disk_sb.bdev->bd_disk) < 1838 ca->mi.bucket_size * nbuckets) { 1839 bch_err(ca, "New size larger than device"); 1840 ret = -BCH_ERR_device_size_too_small; 1841 goto err; 1842 } 1843 1844 ret = bch2_dev_buckets_resize(c, ca, nbuckets); 1845 if (ret) { 1846 bch_err_msg(ca, ret, "resizing buckets"); 1847 goto err; 1848 } 1849 1850 ret = bch2_trans_mark_dev_sb(c, ca); 1851 if (ret) 1852 goto err; 1853 1854 mutex_lock(&c->sb_lock); 1855 m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx); 1856 m->nbuckets = cpu_to_le64(nbuckets); 1857 1858 bch2_write_super(c); 1859 mutex_unlock(&c->sb_lock); 1860 1861 if (ca->mi.freespace_initialized) { 1862 ret = bch2_dev_freespace_init(c, ca, old_nbuckets, nbuckets); 1863 if (ret) 1864 goto err; 1865 1866 /* 1867 * XXX: this is all wrong transactionally - we'll be able to do 1868 * this correctly after the disk space accounting rewrite 1869 */ 1870 ca->usage_base->d[BCH_DATA_free].buckets += nbuckets - old_nbuckets; 1871 } 1872 1873 bch2_recalc_capacity(c); 1874 err: 1875 up_write(&c->state_lock); 1876 return ret; 1877 } 1878 1879 /* return with ref on ca->ref: */ 1880 struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *name) 1881 { 1882 struct bch_dev *ca; 1883 unsigned i; 1884 1885 rcu_read_lock(); 1886 for_each_member_device_rcu(ca, c, i, NULL) 1887 if (!strcmp(name, ca->name)) 1888 goto found; 1889 ca = ERR_PTR(-BCH_ERR_ENOENT_dev_not_found); 1890 found: 1891 rcu_read_unlock(); 1892 1893 return ca; 1894 } 1895 1896 /* Filesystem open: */ 1897 1898 struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices, 1899 struct bch_opts opts) 1900 { 1901 DARRAY(struct bch_sb_handle) sbs = { 0 }; 1902 struct bch_fs *c = NULL; 1903 struct bch_sb_handle *sb, *best = NULL; 1904 struct printbuf errbuf = PRINTBUF; 1905 int ret = 0; 1906 1907 if (!try_module_get(THIS_MODULE)) 1908 return ERR_PTR(-ENODEV); 1909 1910 if (!nr_devices) { 1911 ret = -EINVAL; 1912 goto err; 1913 } 1914 1915 ret = darray_make_room(&sbs, nr_devices); 1916 if (ret) 1917 goto err; 1918 1919 for (unsigned i = 0; i < nr_devices; i++) { 1920 struct bch_sb_handle sb = { NULL }; 1921 1922 ret = bch2_read_super(devices[i], &opts, &sb); 1923 if (ret) 1924 goto err; 1925 1926 BUG_ON(darray_push(&sbs, sb)); 1927 } 1928 1929 darray_for_each(sbs, sb) 1930 if (!best || le64_to_cpu(sb->sb->seq) > le64_to_cpu(best->sb->seq)) 1931 best = sb; 1932 1933 darray_for_each_reverse(sbs, sb) { 1934 if (sb != best && !bch2_dev_exists(best->sb, sb->sb->dev_idx)) { 1935 pr_info("%pg has been removed, skipping", sb->bdev); 1936 bch2_free_super(sb); 1937 darray_remove_item(&sbs, sb); 1938 best -= best > sb; 1939 continue; 1940 } 1941 1942 ret = bch2_dev_in_fs(best->sb, sb->sb); 1943 if (ret) 1944 goto err_print; 1945 } 1946 1947 c = bch2_fs_alloc(best->sb, opts); 1948 ret = PTR_ERR_OR_ZERO(c); 1949 if (ret) 1950 goto err; 1951 1952 down_write(&c->state_lock); 1953 darray_for_each(sbs, sb) { 1954 ret = bch2_dev_attach_bdev(c, sb); 1955 if (ret) { 1956 up_write(&c->state_lock); 1957 goto err; 1958 } 1959 } 1960 up_write(&c->state_lock); 1961 1962 if (!bch2_fs_may_start(c)) { 1963 ret = -BCH_ERR_insufficient_devices_to_start; 1964 goto err_print; 1965 } 1966 1967 if (!c->opts.nostart) { 1968 ret = bch2_fs_start(c); 1969 if (ret) 1970 goto err; 1971 } 1972 out: 1973 darray_for_each(sbs, sb) 1974 bch2_free_super(sb); 1975 darray_exit(&sbs); 1976 printbuf_exit(&errbuf); 1977 module_put(THIS_MODULE); 1978 return c; 1979 err_print: 1980 pr_err("bch_fs_open err opening %s: %s", 1981 devices[0], bch2_err_str(ret)); 1982 err: 1983 if (!IS_ERR_OR_NULL(c)) 1984 bch2_fs_stop(c); 1985 c = ERR_PTR(ret); 1986 goto out; 1987 } 1988 1989 /* Global interfaces/init */ 1990 1991 static void bcachefs_exit(void) 1992 { 1993 bch2_debug_exit(); 1994 bch2_vfs_exit(); 1995 bch2_chardev_exit(); 1996 bch2_btree_key_cache_exit(); 1997 if (bcachefs_kset) 1998 kset_unregister(bcachefs_kset); 1999 } 2000 2001 static int __init bcachefs_init(void) 2002 { 2003 bch2_bkey_pack_test(); 2004 2005 if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) || 2006 bch2_btree_key_cache_init() || 2007 bch2_chardev_init() || 2008 bch2_vfs_init() || 2009 bch2_debug_init()) 2010 goto err; 2011 2012 return 0; 2013 err: 2014 bcachefs_exit(); 2015 return -ENOMEM; 2016 } 2017 2018 #define BCH_DEBUG_PARAM(name, description) \ 2019 bool bch2_##name; \ 2020 module_param_named(name, bch2_##name, bool, 0644); \ 2021 MODULE_PARM_DESC(name, description); 2022 BCH_DEBUG_PARAMS() 2023 #undef BCH_DEBUG_PARAM 2024 2025 __maybe_unused 2026 static unsigned bch2_metadata_version = bcachefs_metadata_version_current; 2027 module_param_named(version, bch2_metadata_version, uint, 0400); 2028 2029 module_exit(bcachefs_exit); 2030 module_init(bcachefs_init); 2031