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