1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * bcache sysfs interfaces 4 * 5 * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com> 6 * Copyright 2012 Google, Inc. 7 */ 8 9 #include "bcache.h" 10 #include "sysfs.h" 11 #include "btree.h" 12 #include "request.h" 13 #include "writeback.h" 14 15 #include <linux/blkdev.h> 16 #include <linux/sort.h> 17 #include <linux/sched/clock.h> 18 19 extern bool bcache_is_reboot; 20 21 /* Default is 0 ("writethrough") */ 22 static const char * const bch_cache_modes[] = { 23 "writethrough", 24 "writeback", 25 "writearound", 26 "none", 27 NULL 28 }; 29 30 static const char * const bch_reada_cache_policies[] = { 31 "all", 32 "meta-only", 33 NULL 34 }; 35 36 /* Default is 0 ("auto") */ 37 static const char * const bch_stop_on_failure_modes[] = { 38 "auto", 39 "always", 40 NULL 41 }; 42 43 static const char * const cache_replacement_policies[] = { 44 "lru", 45 "fifo", 46 "random", 47 NULL 48 }; 49 50 static const char * const error_actions[] = { 51 "unregister", 52 "panic", 53 NULL 54 }; 55 56 write_attribute(attach); 57 write_attribute(detach); 58 write_attribute(unregister); 59 write_attribute(stop); 60 write_attribute(clear_stats); 61 write_attribute(trigger_gc); 62 write_attribute(prune_cache); 63 write_attribute(flash_vol_create); 64 65 read_attribute(bucket_size); 66 read_attribute(block_size); 67 read_attribute(nbuckets); 68 read_attribute(tree_depth); 69 read_attribute(root_usage_percent); 70 read_attribute(priority_stats); 71 read_attribute(btree_cache_size); 72 read_attribute(btree_cache_max_chain); 73 read_attribute(cache_available_percent); 74 read_attribute(written); 75 read_attribute(btree_written); 76 read_attribute(metadata_written); 77 read_attribute(active_journal_entries); 78 read_attribute(backing_dev_name); 79 read_attribute(backing_dev_uuid); 80 81 sysfs_time_stats_attribute(btree_gc, sec, ms); 82 sysfs_time_stats_attribute(btree_split, sec, us); 83 sysfs_time_stats_attribute(btree_sort, ms, us); 84 sysfs_time_stats_attribute(btree_read, ms, us); 85 86 read_attribute(btree_nodes); 87 read_attribute(btree_used_percent); 88 read_attribute(average_key_size); 89 read_attribute(dirty_data); 90 read_attribute(bset_tree_stats); 91 92 read_attribute(state); 93 read_attribute(cache_read_races); 94 read_attribute(reclaim); 95 read_attribute(reclaimed_journal_buckets); 96 read_attribute(flush_write); 97 read_attribute(writeback_keys_done); 98 read_attribute(writeback_keys_failed); 99 read_attribute(io_errors); 100 read_attribute(congested); 101 read_attribute(cutoff_writeback); 102 read_attribute(cutoff_writeback_sync); 103 rw_attribute(congested_read_threshold_us); 104 rw_attribute(congested_write_threshold_us); 105 106 rw_attribute(sequential_cutoff); 107 rw_attribute(data_csum); 108 rw_attribute(cache_mode); 109 rw_attribute(readahead_cache_policy); 110 rw_attribute(stop_when_cache_set_failed); 111 rw_attribute(writeback_metadata); 112 rw_attribute(writeback_running); 113 rw_attribute(writeback_percent); 114 rw_attribute(writeback_delay); 115 rw_attribute(writeback_rate); 116 117 rw_attribute(writeback_rate_update_seconds); 118 rw_attribute(writeback_rate_i_term_inverse); 119 rw_attribute(writeback_rate_p_term_inverse); 120 rw_attribute(writeback_rate_minimum); 121 read_attribute(writeback_rate_debug); 122 123 read_attribute(stripe_size); 124 read_attribute(partial_stripes_expensive); 125 126 rw_attribute(synchronous); 127 rw_attribute(journal_delay_ms); 128 rw_attribute(io_disable); 129 rw_attribute(discard); 130 rw_attribute(running); 131 rw_attribute(label); 132 rw_attribute(readahead); 133 rw_attribute(errors); 134 rw_attribute(io_error_limit); 135 rw_attribute(io_error_halflife); 136 rw_attribute(verify); 137 rw_attribute(bypass_torture_test); 138 rw_attribute(key_merging_disabled); 139 rw_attribute(gc_always_rewrite); 140 rw_attribute(expensive_debug_checks); 141 rw_attribute(cache_replacement_policy); 142 rw_attribute(btree_shrinker_disabled); 143 rw_attribute(copy_gc_enabled); 144 rw_attribute(idle_max_writeback_rate); 145 rw_attribute(gc_after_writeback); 146 rw_attribute(size); 147 148 static ssize_t bch_snprint_string_list(char *buf, 149 size_t size, 150 const char * const list[], 151 size_t selected) 152 { 153 char *out = buf; 154 size_t i; 155 156 for (i = 0; list[i]; i++) 157 out += snprintf(out, buf + size - out, 158 i == selected ? "[%s] " : "%s ", list[i]); 159 160 out[-1] = '\n'; 161 return out - buf; 162 } 163 164 SHOW(__bch_cached_dev) 165 { 166 struct cached_dev *dc = container_of(kobj, struct cached_dev, 167 disk.kobj); 168 char const *states[] = { "no cache", "clean", "dirty", "inconsistent" }; 169 int wb = dc->writeback_running; 170 171 #define var(stat) (dc->stat) 172 173 if (attr == &sysfs_cache_mode) 174 return bch_snprint_string_list(buf, PAGE_SIZE, 175 bch_cache_modes, 176 BDEV_CACHE_MODE(&dc->sb)); 177 178 if (attr == &sysfs_readahead_cache_policy) 179 return bch_snprint_string_list(buf, PAGE_SIZE, 180 bch_reada_cache_policies, 181 dc->cache_readahead_policy); 182 183 if (attr == &sysfs_stop_when_cache_set_failed) 184 return bch_snprint_string_list(buf, PAGE_SIZE, 185 bch_stop_on_failure_modes, 186 dc->stop_when_cache_set_failed); 187 188 189 sysfs_printf(data_csum, "%i", dc->disk.data_csum); 190 var_printf(verify, "%i"); 191 var_printf(bypass_torture_test, "%i"); 192 var_printf(writeback_metadata, "%i"); 193 var_printf(writeback_running, "%i"); 194 var_print(writeback_delay); 195 var_print(writeback_percent); 196 sysfs_hprint(writeback_rate, 197 wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 : 0); 198 sysfs_printf(io_errors, "%i", atomic_read(&dc->io_errors)); 199 sysfs_printf(io_error_limit, "%i", dc->error_limit); 200 sysfs_printf(io_disable, "%i", dc->io_disable); 201 var_print(writeback_rate_update_seconds); 202 var_print(writeback_rate_i_term_inverse); 203 var_print(writeback_rate_p_term_inverse); 204 var_print(writeback_rate_minimum); 205 206 if (attr == &sysfs_writeback_rate_debug) { 207 char rate[20]; 208 char dirty[20]; 209 char target[20]; 210 char proportional[20]; 211 char integral[20]; 212 char change[20]; 213 s64 next_io; 214 215 /* 216 * Except for dirty and target, other values should 217 * be 0 if writeback is not running. 218 */ 219 bch_hprint(rate, 220 wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 221 : 0); 222 bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9); 223 bch_hprint(target, dc->writeback_rate_target << 9); 224 bch_hprint(proportional, 225 wb ? dc->writeback_rate_proportional << 9 : 0); 226 bch_hprint(integral, 227 wb ? dc->writeback_rate_integral_scaled << 9 : 0); 228 bch_hprint(change, wb ? dc->writeback_rate_change << 9 : 0); 229 next_io = wb ? div64_s64(dc->writeback_rate.next-local_clock(), 230 NSEC_PER_MSEC) : 0; 231 232 return sprintf(buf, 233 "rate:\t\t%s/sec\n" 234 "dirty:\t\t%s\n" 235 "target:\t\t%s\n" 236 "proportional:\t%s\n" 237 "integral:\t%s\n" 238 "change:\t\t%s/sec\n" 239 "next io:\t%llims\n", 240 rate, dirty, target, proportional, 241 integral, change, next_io); 242 } 243 244 sysfs_hprint(dirty_data, 245 bcache_dev_sectors_dirty(&dc->disk) << 9); 246 247 sysfs_hprint(stripe_size, ((uint64_t)dc->disk.stripe_size) << 9); 248 var_printf(partial_stripes_expensive, "%u"); 249 250 var_hprint(sequential_cutoff); 251 var_hprint(readahead); 252 253 sysfs_print(running, atomic_read(&dc->running)); 254 sysfs_print(state, states[BDEV_STATE(&dc->sb)]); 255 256 if (attr == &sysfs_label) { 257 memcpy(buf, dc->sb.label, SB_LABEL_SIZE); 258 buf[SB_LABEL_SIZE + 1] = '\0'; 259 strcat(buf, "\n"); 260 return strlen(buf); 261 } 262 263 if (attr == &sysfs_backing_dev_name) { 264 snprintf(buf, BDEVNAME_SIZE + 1, "%s", dc->backing_dev_name); 265 strcat(buf, "\n"); 266 return strlen(buf); 267 } 268 269 if (attr == &sysfs_backing_dev_uuid) { 270 /* convert binary uuid into 36-byte string plus '\0' */ 271 snprintf(buf, 36+1, "%pU", dc->sb.uuid); 272 strcat(buf, "\n"); 273 return strlen(buf); 274 } 275 276 #undef var 277 return 0; 278 } 279 SHOW_LOCKED(bch_cached_dev) 280 281 STORE(__cached_dev) 282 { 283 struct cached_dev *dc = container_of(kobj, struct cached_dev, 284 disk.kobj); 285 ssize_t v; 286 struct cache_set *c; 287 struct kobj_uevent_env *env; 288 289 /* no user space access if system is rebooting */ 290 if (bcache_is_reboot) 291 return -EBUSY; 292 293 #define d_strtoul(var) sysfs_strtoul(var, dc->var) 294 #define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX) 295 #define d_strtoi_h(var) sysfs_hatoi(var, dc->var) 296 297 sysfs_strtoul(data_csum, dc->disk.data_csum); 298 d_strtoul(verify); 299 sysfs_strtoul_bool(bypass_torture_test, dc->bypass_torture_test); 300 sysfs_strtoul_bool(writeback_metadata, dc->writeback_metadata); 301 sysfs_strtoul_bool(writeback_running, dc->writeback_running); 302 sysfs_strtoul_clamp(writeback_delay, dc->writeback_delay, 0, UINT_MAX); 303 304 sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 305 0, bch_cutoff_writeback); 306 307 if (attr == &sysfs_writeback_rate) { 308 ssize_t ret; 309 long int v = atomic_long_read(&dc->writeback_rate.rate); 310 311 ret = strtoul_safe_clamp(buf, v, 1, INT_MAX); 312 313 if (!ret) { 314 atomic_long_set(&dc->writeback_rate.rate, v); 315 ret = size; 316 } 317 318 return ret; 319 } 320 321 sysfs_strtoul_clamp(writeback_rate_update_seconds, 322 dc->writeback_rate_update_seconds, 323 1, WRITEBACK_RATE_UPDATE_SECS_MAX); 324 sysfs_strtoul_clamp(writeback_rate_i_term_inverse, 325 dc->writeback_rate_i_term_inverse, 326 1, UINT_MAX); 327 sysfs_strtoul_clamp(writeback_rate_p_term_inverse, 328 dc->writeback_rate_p_term_inverse, 329 1, UINT_MAX); 330 sysfs_strtoul_clamp(writeback_rate_minimum, 331 dc->writeback_rate_minimum, 332 1, UINT_MAX); 333 334 sysfs_strtoul_clamp(io_error_limit, dc->error_limit, 0, INT_MAX); 335 336 if (attr == &sysfs_io_disable) { 337 int v = strtoul_or_return(buf); 338 339 dc->io_disable = v ? 1 : 0; 340 } 341 342 sysfs_strtoul_clamp(sequential_cutoff, 343 dc->sequential_cutoff, 344 0, UINT_MAX); 345 d_strtoi_h(readahead); 346 347 if (attr == &sysfs_clear_stats) 348 bch_cache_accounting_clear(&dc->accounting); 349 350 if (attr == &sysfs_running && 351 strtoul_or_return(buf)) { 352 v = bch_cached_dev_run(dc); 353 if (v) 354 return v; 355 } 356 357 if (attr == &sysfs_cache_mode) { 358 v = __sysfs_match_string(bch_cache_modes, -1, buf); 359 if (v < 0) 360 return v; 361 362 if ((unsigned int) v != BDEV_CACHE_MODE(&dc->sb)) { 363 SET_BDEV_CACHE_MODE(&dc->sb, v); 364 bch_write_bdev_super(dc, NULL); 365 } 366 } 367 368 if (attr == &sysfs_readahead_cache_policy) { 369 v = __sysfs_match_string(bch_reada_cache_policies, -1, buf); 370 if (v < 0) 371 return v; 372 373 if ((unsigned int) v != dc->cache_readahead_policy) 374 dc->cache_readahead_policy = v; 375 } 376 377 if (attr == &sysfs_stop_when_cache_set_failed) { 378 v = __sysfs_match_string(bch_stop_on_failure_modes, -1, buf); 379 if (v < 0) 380 return v; 381 382 dc->stop_when_cache_set_failed = v; 383 } 384 385 if (attr == &sysfs_label) { 386 if (size > SB_LABEL_SIZE) 387 return -EINVAL; 388 memcpy(dc->sb.label, buf, size); 389 if (size < SB_LABEL_SIZE) 390 dc->sb.label[size] = '\0'; 391 if (size && dc->sb.label[size - 1] == '\n') 392 dc->sb.label[size - 1] = '\0'; 393 bch_write_bdev_super(dc, NULL); 394 if (dc->disk.c) { 395 memcpy(dc->disk.c->uuids[dc->disk.id].label, 396 buf, SB_LABEL_SIZE); 397 bch_uuid_write(dc->disk.c); 398 } 399 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); 400 if (!env) 401 return -ENOMEM; 402 add_uevent_var(env, "DRIVER=bcache"); 403 add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid), 404 add_uevent_var(env, "CACHED_LABEL=%s", buf); 405 kobject_uevent_env(&disk_to_dev(dc->disk.disk)->kobj, 406 KOBJ_CHANGE, 407 env->envp); 408 kfree(env); 409 } 410 411 if (attr == &sysfs_attach) { 412 uint8_t set_uuid[16]; 413 414 if (bch_parse_uuid(buf, set_uuid) < 16) 415 return -EINVAL; 416 417 v = -ENOENT; 418 list_for_each_entry(c, &bch_cache_sets, list) { 419 v = bch_cached_dev_attach(dc, c, set_uuid); 420 if (!v) 421 return size; 422 } 423 if (v == -ENOENT) 424 pr_err("Can't attach %s: cache set not found", buf); 425 return v; 426 } 427 428 if (attr == &sysfs_detach && dc->disk.c) 429 bch_cached_dev_detach(dc); 430 431 if (attr == &sysfs_stop) 432 bcache_device_stop(&dc->disk); 433 434 return size; 435 } 436 437 STORE(bch_cached_dev) 438 { 439 struct cached_dev *dc = container_of(kobj, struct cached_dev, 440 disk.kobj); 441 442 /* no user space access if system is rebooting */ 443 if (bcache_is_reboot) 444 return -EBUSY; 445 446 mutex_lock(&bch_register_lock); 447 size = __cached_dev_store(kobj, attr, buf, size); 448 449 if (attr == &sysfs_writeback_running) { 450 /* dc->writeback_running changed in __cached_dev_store() */ 451 if (IS_ERR_OR_NULL(dc->writeback_thread)) { 452 /* 453 * reject setting it to 1 via sysfs if writeback 454 * kthread is not created yet. 455 */ 456 if (dc->writeback_running) { 457 dc->writeback_running = false; 458 pr_err("%s: failed to run non-existent writeback thread", 459 dc->disk.disk->disk_name); 460 } 461 } else 462 /* 463 * writeback kthread will check if dc->writeback_running 464 * is true or false. 465 */ 466 bch_writeback_queue(dc); 467 } 468 469 /* 470 * Only set BCACHE_DEV_WB_RUNNING when cached device attached to 471 * a cache set, otherwise it doesn't make sense. 472 */ 473 if (attr == &sysfs_writeback_percent) 474 if ((dc->disk.c != NULL) && 475 (!test_and_set_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags))) 476 schedule_delayed_work(&dc->writeback_rate_update, 477 dc->writeback_rate_update_seconds * HZ); 478 479 mutex_unlock(&bch_register_lock); 480 return size; 481 } 482 483 static struct attribute *bch_cached_dev_files[] = { 484 &sysfs_attach, 485 &sysfs_detach, 486 &sysfs_stop, 487 #if 0 488 &sysfs_data_csum, 489 #endif 490 &sysfs_cache_mode, 491 &sysfs_readahead_cache_policy, 492 &sysfs_stop_when_cache_set_failed, 493 &sysfs_writeback_metadata, 494 &sysfs_writeback_running, 495 &sysfs_writeback_delay, 496 &sysfs_writeback_percent, 497 &sysfs_writeback_rate, 498 &sysfs_writeback_rate_update_seconds, 499 &sysfs_writeback_rate_i_term_inverse, 500 &sysfs_writeback_rate_p_term_inverse, 501 &sysfs_writeback_rate_minimum, 502 &sysfs_writeback_rate_debug, 503 &sysfs_io_errors, 504 &sysfs_io_error_limit, 505 &sysfs_io_disable, 506 &sysfs_dirty_data, 507 &sysfs_stripe_size, 508 &sysfs_partial_stripes_expensive, 509 &sysfs_sequential_cutoff, 510 &sysfs_clear_stats, 511 &sysfs_running, 512 &sysfs_state, 513 &sysfs_label, 514 &sysfs_readahead, 515 #ifdef CONFIG_BCACHE_DEBUG 516 &sysfs_verify, 517 &sysfs_bypass_torture_test, 518 #endif 519 &sysfs_backing_dev_name, 520 &sysfs_backing_dev_uuid, 521 NULL 522 }; 523 KTYPE(bch_cached_dev); 524 525 SHOW(bch_flash_dev) 526 { 527 struct bcache_device *d = container_of(kobj, struct bcache_device, 528 kobj); 529 struct uuid_entry *u = &d->c->uuids[d->id]; 530 531 sysfs_printf(data_csum, "%i", d->data_csum); 532 sysfs_hprint(size, u->sectors << 9); 533 534 if (attr == &sysfs_label) { 535 memcpy(buf, u->label, SB_LABEL_SIZE); 536 buf[SB_LABEL_SIZE + 1] = '\0'; 537 strcat(buf, "\n"); 538 return strlen(buf); 539 } 540 541 return 0; 542 } 543 544 STORE(__bch_flash_dev) 545 { 546 struct bcache_device *d = container_of(kobj, struct bcache_device, 547 kobj); 548 struct uuid_entry *u = &d->c->uuids[d->id]; 549 550 /* no user space access if system is rebooting */ 551 if (bcache_is_reboot) 552 return -EBUSY; 553 554 sysfs_strtoul(data_csum, d->data_csum); 555 556 if (attr == &sysfs_size) { 557 uint64_t v; 558 559 strtoi_h_or_return(buf, v); 560 561 u->sectors = v >> 9; 562 bch_uuid_write(d->c); 563 set_capacity(d->disk, u->sectors); 564 } 565 566 if (attr == &sysfs_label) { 567 memcpy(u->label, buf, SB_LABEL_SIZE); 568 bch_uuid_write(d->c); 569 } 570 571 if (attr == &sysfs_unregister) { 572 set_bit(BCACHE_DEV_DETACHING, &d->flags); 573 bcache_device_stop(d); 574 } 575 576 return size; 577 } 578 STORE_LOCKED(bch_flash_dev) 579 580 static struct attribute *bch_flash_dev_files[] = { 581 &sysfs_unregister, 582 #if 0 583 &sysfs_data_csum, 584 #endif 585 &sysfs_label, 586 &sysfs_size, 587 NULL 588 }; 589 KTYPE(bch_flash_dev); 590 591 struct bset_stats_op { 592 struct btree_op op; 593 size_t nodes; 594 struct bset_stats stats; 595 }; 596 597 static int bch_btree_bset_stats(struct btree_op *b_op, struct btree *b) 598 { 599 struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op); 600 601 op->nodes++; 602 bch_btree_keys_stats(&b->keys, &op->stats); 603 604 return MAP_CONTINUE; 605 } 606 607 static int bch_bset_print_stats(struct cache_set *c, char *buf) 608 { 609 struct bset_stats_op op; 610 int ret; 611 612 memset(&op, 0, sizeof(op)); 613 bch_btree_op_init(&op.op, -1); 614 615 ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, bch_btree_bset_stats); 616 if (ret < 0) 617 return ret; 618 619 return snprintf(buf, PAGE_SIZE, 620 "btree nodes: %zu\n" 621 "written sets: %zu\n" 622 "unwritten sets: %zu\n" 623 "written key bytes: %zu\n" 624 "unwritten key bytes: %zu\n" 625 "floats: %zu\n" 626 "failed: %zu\n", 627 op.nodes, 628 op.stats.sets_written, op.stats.sets_unwritten, 629 op.stats.bytes_written, op.stats.bytes_unwritten, 630 op.stats.floats, op.stats.failed); 631 } 632 633 static unsigned int bch_root_usage(struct cache_set *c) 634 { 635 unsigned int bytes = 0; 636 struct bkey *k; 637 struct btree *b; 638 struct btree_iter iter; 639 640 goto lock_root; 641 642 do { 643 rw_unlock(false, b); 644 lock_root: 645 b = c->root; 646 rw_lock(false, b, b->level); 647 } while (b != c->root); 648 649 for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad) 650 bytes += bkey_bytes(k); 651 652 rw_unlock(false, b); 653 654 return (bytes * 100) / btree_bytes(c); 655 } 656 657 static size_t bch_cache_size(struct cache_set *c) 658 { 659 size_t ret = 0; 660 struct btree *b; 661 662 mutex_lock(&c->bucket_lock); 663 list_for_each_entry(b, &c->btree_cache, list) 664 ret += 1 << (b->keys.page_order + PAGE_SHIFT); 665 666 mutex_unlock(&c->bucket_lock); 667 return ret; 668 } 669 670 static unsigned int bch_cache_max_chain(struct cache_set *c) 671 { 672 unsigned int ret = 0; 673 struct hlist_head *h; 674 675 mutex_lock(&c->bucket_lock); 676 677 for (h = c->bucket_hash; 678 h < c->bucket_hash + (1 << BUCKET_HASH_BITS); 679 h++) { 680 unsigned int i = 0; 681 struct hlist_node *p; 682 683 hlist_for_each(p, h) 684 i++; 685 686 ret = max(ret, i); 687 } 688 689 mutex_unlock(&c->bucket_lock); 690 return ret; 691 } 692 693 static unsigned int bch_btree_used(struct cache_set *c) 694 { 695 return div64_u64(c->gc_stats.key_bytes * 100, 696 (c->gc_stats.nodes ?: 1) * btree_bytes(c)); 697 } 698 699 static unsigned int bch_average_key_size(struct cache_set *c) 700 { 701 return c->gc_stats.nkeys 702 ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys) 703 : 0; 704 } 705 706 SHOW(__bch_cache_set) 707 { 708 struct cache_set *c = container_of(kobj, struct cache_set, kobj); 709 710 sysfs_print(synchronous, CACHE_SYNC(&c->sb)); 711 sysfs_print(journal_delay_ms, c->journal_delay_ms); 712 sysfs_hprint(bucket_size, bucket_bytes(c)); 713 sysfs_hprint(block_size, block_bytes(c)); 714 sysfs_print(tree_depth, c->root->level); 715 sysfs_print(root_usage_percent, bch_root_usage(c)); 716 717 sysfs_hprint(btree_cache_size, bch_cache_size(c)); 718 sysfs_print(btree_cache_max_chain, bch_cache_max_chain(c)); 719 sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use); 720 721 sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms); 722 sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us); 723 sysfs_print_time_stats(&c->sort.time, btree_sort, ms, us); 724 sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us); 725 726 sysfs_print(btree_used_percent, bch_btree_used(c)); 727 sysfs_print(btree_nodes, c->gc_stats.nodes); 728 sysfs_hprint(average_key_size, bch_average_key_size(c)); 729 730 sysfs_print(cache_read_races, 731 atomic_long_read(&c->cache_read_races)); 732 733 sysfs_print(reclaim, 734 atomic_long_read(&c->reclaim)); 735 736 sysfs_print(reclaimed_journal_buckets, 737 atomic_long_read(&c->reclaimed_journal_buckets)); 738 739 sysfs_print(flush_write, 740 atomic_long_read(&c->flush_write)); 741 742 sysfs_print(writeback_keys_done, 743 atomic_long_read(&c->writeback_keys_done)); 744 sysfs_print(writeback_keys_failed, 745 atomic_long_read(&c->writeback_keys_failed)); 746 747 if (attr == &sysfs_errors) 748 return bch_snprint_string_list(buf, PAGE_SIZE, error_actions, 749 c->on_error); 750 751 /* See count_io_errors for why 88 */ 752 sysfs_print(io_error_halflife, c->error_decay * 88); 753 sysfs_print(io_error_limit, c->error_limit); 754 755 sysfs_hprint(congested, 756 ((uint64_t) bch_get_congested(c)) << 9); 757 sysfs_print(congested_read_threshold_us, 758 c->congested_read_threshold_us); 759 sysfs_print(congested_write_threshold_us, 760 c->congested_write_threshold_us); 761 762 sysfs_print(cutoff_writeback, bch_cutoff_writeback); 763 sysfs_print(cutoff_writeback_sync, bch_cutoff_writeback_sync); 764 765 sysfs_print(active_journal_entries, fifo_used(&c->journal.pin)); 766 sysfs_printf(verify, "%i", c->verify); 767 sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled); 768 sysfs_printf(expensive_debug_checks, 769 "%i", c->expensive_debug_checks); 770 sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite); 771 sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled); 772 sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled); 773 sysfs_printf(idle_max_writeback_rate, "%i", 774 c->idle_max_writeback_rate_enabled); 775 sysfs_printf(gc_after_writeback, "%i", c->gc_after_writeback); 776 sysfs_printf(io_disable, "%i", 777 test_bit(CACHE_SET_IO_DISABLE, &c->flags)); 778 779 if (attr == &sysfs_bset_tree_stats) 780 return bch_bset_print_stats(c, buf); 781 782 return 0; 783 } 784 SHOW_LOCKED(bch_cache_set) 785 786 STORE(__bch_cache_set) 787 { 788 struct cache_set *c = container_of(kobj, struct cache_set, kobj); 789 ssize_t v; 790 791 /* no user space access if system is rebooting */ 792 if (bcache_is_reboot) 793 return -EBUSY; 794 795 if (attr == &sysfs_unregister) 796 bch_cache_set_unregister(c); 797 798 if (attr == &sysfs_stop) 799 bch_cache_set_stop(c); 800 801 if (attr == &sysfs_synchronous) { 802 bool sync = strtoul_or_return(buf); 803 804 if (sync != CACHE_SYNC(&c->sb)) { 805 SET_CACHE_SYNC(&c->sb, sync); 806 bcache_write_super(c); 807 } 808 } 809 810 if (attr == &sysfs_flash_vol_create) { 811 int r; 812 uint64_t v; 813 814 strtoi_h_or_return(buf, v); 815 816 r = bch_flash_dev_create(c, v); 817 if (r) 818 return r; 819 } 820 821 if (attr == &sysfs_clear_stats) { 822 atomic_long_set(&c->writeback_keys_done, 0); 823 atomic_long_set(&c->writeback_keys_failed, 0); 824 825 memset(&c->gc_stats, 0, sizeof(struct gc_stat)); 826 bch_cache_accounting_clear(&c->accounting); 827 } 828 829 if (attr == &sysfs_trigger_gc) 830 force_wake_up_gc(c); 831 832 if (attr == &sysfs_prune_cache) { 833 struct shrink_control sc; 834 835 sc.gfp_mask = GFP_KERNEL; 836 sc.nr_to_scan = strtoul_or_return(buf); 837 c->shrink.scan_objects(&c->shrink, &sc); 838 } 839 840 sysfs_strtoul_clamp(congested_read_threshold_us, 841 c->congested_read_threshold_us, 842 0, UINT_MAX); 843 sysfs_strtoul_clamp(congested_write_threshold_us, 844 c->congested_write_threshold_us, 845 0, UINT_MAX); 846 847 if (attr == &sysfs_errors) { 848 v = __sysfs_match_string(error_actions, -1, buf); 849 if (v < 0) 850 return v; 851 852 c->on_error = v; 853 } 854 855 sysfs_strtoul_clamp(io_error_limit, c->error_limit, 0, UINT_MAX); 856 857 /* See count_io_errors() for why 88 */ 858 if (attr == &sysfs_io_error_halflife) { 859 unsigned long v = 0; 860 ssize_t ret; 861 862 ret = strtoul_safe_clamp(buf, v, 0, UINT_MAX); 863 if (!ret) { 864 c->error_decay = v / 88; 865 return size; 866 } 867 return ret; 868 } 869 870 if (attr == &sysfs_io_disable) { 871 v = strtoul_or_return(buf); 872 if (v) { 873 if (test_and_set_bit(CACHE_SET_IO_DISABLE, 874 &c->flags)) 875 pr_warn("CACHE_SET_IO_DISABLE already set"); 876 } else { 877 if (!test_and_clear_bit(CACHE_SET_IO_DISABLE, 878 &c->flags)) 879 pr_warn("CACHE_SET_IO_DISABLE already cleared"); 880 } 881 } 882 883 sysfs_strtoul_clamp(journal_delay_ms, 884 c->journal_delay_ms, 885 0, USHRT_MAX); 886 sysfs_strtoul_bool(verify, c->verify); 887 sysfs_strtoul_bool(key_merging_disabled, c->key_merging_disabled); 888 sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks); 889 sysfs_strtoul_bool(gc_always_rewrite, c->gc_always_rewrite); 890 sysfs_strtoul_bool(btree_shrinker_disabled, c->shrinker_disabled); 891 sysfs_strtoul_bool(copy_gc_enabled, c->copy_gc_enabled); 892 sysfs_strtoul_bool(idle_max_writeback_rate, 893 c->idle_max_writeback_rate_enabled); 894 895 /* 896 * write gc_after_writeback here may overwrite an already set 897 * BCH_DO_AUTO_GC, it doesn't matter because this flag will be 898 * set in next chance. 899 */ 900 sysfs_strtoul_clamp(gc_after_writeback, c->gc_after_writeback, 0, 1); 901 902 return size; 903 } 904 STORE_LOCKED(bch_cache_set) 905 906 SHOW(bch_cache_set_internal) 907 { 908 struct cache_set *c = container_of(kobj, struct cache_set, internal); 909 910 return bch_cache_set_show(&c->kobj, attr, buf); 911 } 912 913 STORE(bch_cache_set_internal) 914 { 915 struct cache_set *c = container_of(kobj, struct cache_set, internal); 916 917 /* no user space access if system is rebooting */ 918 if (bcache_is_reboot) 919 return -EBUSY; 920 921 return bch_cache_set_store(&c->kobj, attr, buf, size); 922 } 923 924 static void bch_cache_set_internal_release(struct kobject *k) 925 { 926 } 927 928 static struct attribute *bch_cache_set_files[] = { 929 &sysfs_unregister, 930 &sysfs_stop, 931 &sysfs_synchronous, 932 &sysfs_journal_delay_ms, 933 &sysfs_flash_vol_create, 934 935 &sysfs_bucket_size, 936 &sysfs_block_size, 937 &sysfs_tree_depth, 938 &sysfs_root_usage_percent, 939 &sysfs_btree_cache_size, 940 &sysfs_cache_available_percent, 941 942 &sysfs_average_key_size, 943 944 &sysfs_errors, 945 &sysfs_io_error_limit, 946 &sysfs_io_error_halflife, 947 &sysfs_congested, 948 &sysfs_congested_read_threshold_us, 949 &sysfs_congested_write_threshold_us, 950 &sysfs_clear_stats, 951 NULL 952 }; 953 KTYPE(bch_cache_set); 954 955 static struct attribute *bch_cache_set_internal_files[] = { 956 &sysfs_active_journal_entries, 957 958 sysfs_time_stats_attribute_list(btree_gc, sec, ms) 959 sysfs_time_stats_attribute_list(btree_split, sec, us) 960 sysfs_time_stats_attribute_list(btree_sort, ms, us) 961 sysfs_time_stats_attribute_list(btree_read, ms, us) 962 963 &sysfs_btree_nodes, 964 &sysfs_btree_used_percent, 965 &sysfs_btree_cache_max_chain, 966 967 &sysfs_bset_tree_stats, 968 &sysfs_cache_read_races, 969 &sysfs_reclaim, 970 &sysfs_reclaimed_journal_buckets, 971 &sysfs_flush_write, 972 &sysfs_writeback_keys_done, 973 &sysfs_writeback_keys_failed, 974 975 &sysfs_trigger_gc, 976 &sysfs_prune_cache, 977 #ifdef CONFIG_BCACHE_DEBUG 978 &sysfs_verify, 979 &sysfs_key_merging_disabled, 980 &sysfs_expensive_debug_checks, 981 #endif 982 &sysfs_gc_always_rewrite, 983 &sysfs_btree_shrinker_disabled, 984 &sysfs_copy_gc_enabled, 985 &sysfs_idle_max_writeback_rate, 986 &sysfs_gc_after_writeback, 987 &sysfs_io_disable, 988 &sysfs_cutoff_writeback, 989 &sysfs_cutoff_writeback_sync, 990 NULL 991 }; 992 KTYPE(bch_cache_set_internal); 993 994 static int __bch_cache_cmp(const void *l, const void *r) 995 { 996 cond_resched(); 997 return *((uint16_t *)r) - *((uint16_t *)l); 998 } 999 1000 SHOW(__bch_cache) 1001 { 1002 struct cache *ca = container_of(kobj, struct cache, kobj); 1003 1004 sysfs_hprint(bucket_size, bucket_bytes(ca)); 1005 sysfs_hprint(block_size, block_bytes(ca)); 1006 sysfs_print(nbuckets, ca->sb.nbuckets); 1007 sysfs_print(discard, ca->discard); 1008 sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9); 1009 sysfs_hprint(btree_written, 1010 atomic_long_read(&ca->btree_sectors_written) << 9); 1011 sysfs_hprint(metadata_written, 1012 (atomic_long_read(&ca->meta_sectors_written) + 1013 atomic_long_read(&ca->btree_sectors_written)) << 9); 1014 1015 sysfs_print(io_errors, 1016 atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT); 1017 1018 if (attr == &sysfs_cache_replacement_policy) 1019 return bch_snprint_string_list(buf, PAGE_SIZE, 1020 cache_replacement_policies, 1021 CACHE_REPLACEMENT(&ca->sb)); 1022 1023 if (attr == &sysfs_priority_stats) { 1024 struct bucket *b; 1025 size_t n = ca->sb.nbuckets, i; 1026 size_t unused = 0, available = 0, dirty = 0, meta = 0; 1027 uint64_t sum = 0; 1028 /* Compute 31 quantiles */ 1029 uint16_t q[31], *p, *cached; 1030 ssize_t ret; 1031 1032 cached = p = vmalloc(array_size(sizeof(uint16_t), 1033 ca->sb.nbuckets)); 1034 if (!p) 1035 return -ENOMEM; 1036 1037 mutex_lock(&ca->set->bucket_lock); 1038 for_each_bucket(b, ca) { 1039 if (!GC_SECTORS_USED(b)) 1040 unused++; 1041 if (GC_MARK(b) == GC_MARK_RECLAIMABLE) 1042 available++; 1043 if (GC_MARK(b) == GC_MARK_DIRTY) 1044 dirty++; 1045 if (GC_MARK(b) == GC_MARK_METADATA) 1046 meta++; 1047 } 1048 1049 for (i = ca->sb.first_bucket; i < n; i++) 1050 p[i] = ca->buckets[i].prio; 1051 mutex_unlock(&ca->set->bucket_lock); 1052 1053 sort(p, n, sizeof(uint16_t), __bch_cache_cmp, NULL); 1054 1055 while (n && 1056 !cached[n - 1]) 1057 --n; 1058 1059 while (cached < p + n && 1060 *cached == BTREE_PRIO) 1061 cached++, n--; 1062 1063 for (i = 0; i < n; i++) 1064 sum += INITIAL_PRIO - cached[i]; 1065 1066 if (n) 1067 do_div(sum, n); 1068 1069 for (i = 0; i < ARRAY_SIZE(q); i++) 1070 q[i] = INITIAL_PRIO - cached[n * (i + 1) / 1071 (ARRAY_SIZE(q) + 1)]; 1072 1073 vfree(p); 1074 1075 ret = scnprintf(buf, PAGE_SIZE, 1076 "Unused: %zu%%\n" 1077 "Clean: %zu%%\n" 1078 "Dirty: %zu%%\n" 1079 "Metadata: %zu%%\n" 1080 "Average: %llu\n" 1081 "Sectors per Q: %zu\n" 1082 "Quantiles: [", 1083 unused * 100 / (size_t) ca->sb.nbuckets, 1084 available * 100 / (size_t) ca->sb.nbuckets, 1085 dirty * 100 / (size_t) ca->sb.nbuckets, 1086 meta * 100 / (size_t) ca->sb.nbuckets, sum, 1087 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1)); 1088 1089 for (i = 0; i < ARRAY_SIZE(q); i++) 1090 ret += scnprintf(buf + ret, PAGE_SIZE - ret, 1091 "%u ", q[i]); 1092 ret--; 1093 1094 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n"); 1095 1096 return ret; 1097 } 1098 1099 return 0; 1100 } 1101 SHOW_LOCKED(bch_cache) 1102 1103 STORE(__bch_cache) 1104 { 1105 struct cache *ca = container_of(kobj, struct cache, kobj); 1106 ssize_t v; 1107 1108 /* no user space access if system is rebooting */ 1109 if (bcache_is_reboot) 1110 return -EBUSY; 1111 1112 if (attr == &sysfs_discard) { 1113 bool v = strtoul_or_return(buf); 1114 1115 if (blk_queue_discard(bdev_get_queue(ca->bdev))) 1116 ca->discard = v; 1117 1118 if (v != CACHE_DISCARD(&ca->sb)) { 1119 SET_CACHE_DISCARD(&ca->sb, v); 1120 bcache_write_super(ca->set); 1121 } 1122 } 1123 1124 if (attr == &sysfs_cache_replacement_policy) { 1125 v = __sysfs_match_string(cache_replacement_policies, -1, buf); 1126 if (v < 0) 1127 return v; 1128 1129 if ((unsigned int) v != CACHE_REPLACEMENT(&ca->sb)) { 1130 mutex_lock(&ca->set->bucket_lock); 1131 SET_CACHE_REPLACEMENT(&ca->sb, v); 1132 mutex_unlock(&ca->set->bucket_lock); 1133 1134 bcache_write_super(ca->set); 1135 } 1136 } 1137 1138 if (attr == &sysfs_clear_stats) { 1139 atomic_long_set(&ca->sectors_written, 0); 1140 atomic_long_set(&ca->btree_sectors_written, 0); 1141 atomic_long_set(&ca->meta_sectors_written, 0); 1142 atomic_set(&ca->io_count, 0); 1143 atomic_set(&ca->io_errors, 0); 1144 } 1145 1146 return size; 1147 } 1148 STORE_LOCKED(bch_cache) 1149 1150 static struct attribute *bch_cache_files[] = { 1151 &sysfs_bucket_size, 1152 &sysfs_block_size, 1153 &sysfs_nbuckets, 1154 &sysfs_priority_stats, 1155 &sysfs_discard, 1156 &sysfs_written, 1157 &sysfs_btree_written, 1158 &sysfs_metadata_written, 1159 &sysfs_io_errors, 1160 &sysfs_clear_stats, 1161 &sysfs_cache_replacement_policy, 1162 NULL 1163 }; 1164 KTYPE(bch_cache); 1165