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