1 /* 2 * bcache sysfs interfaces 3 * 4 * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com> 5 * Copyright 2012 Google, Inc. 6 */ 7 8 #include "bcache.h" 9 #include "sysfs.h" 10 #include "btree.h" 11 #include "request.h" 12 #include "writeback.h" 13 14 #include <linux/blkdev.h> 15 #include <linux/sort.h> 16 17 static const char * const cache_replacement_policies[] = { 18 "lru", 19 "fifo", 20 "random", 21 NULL 22 }; 23 24 static const char * const error_actions[] = { 25 "unregister", 26 "panic", 27 NULL 28 }; 29 30 write_attribute(attach); 31 write_attribute(detach); 32 write_attribute(unregister); 33 write_attribute(stop); 34 write_attribute(clear_stats); 35 write_attribute(trigger_gc); 36 write_attribute(prune_cache); 37 write_attribute(flash_vol_create); 38 39 read_attribute(bucket_size); 40 read_attribute(block_size); 41 read_attribute(nbuckets); 42 read_attribute(tree_depth); 43 read_attribute(root_usage_percent); 44 read_attribute(priority_stats); 45 read_attribute(btree_cache_size); 46 read_attribute(btree_cache_max_chain); 47 read_attribute(cache_available_percent); 48 read_attribute(written); 49 read_attribute(btree_written); 50 read_attribute(metadata_written); 51 read_attribute(active_journal_entries); 52 53 sysfs_time_stats_attribute(btree_gc, sec, ms); 54 sysfs_time_stats_attribute(btree_split, sec, us); 55 sysfs_time_stats_attribute(btree_sort, ms, us); 56 sysfs_time_stats_attribute(btree_read, ms, us); 57 sysfs_time_stats_attribute(try_harder, ms, us); 58 59 read_attribute(btree_nodes); 60 read_attribute(btree_used_percent); 61 read_attribute(average_key_size); 62 read_attribute(dirty_data); 63 read_attribute(bset_tree_stats); 64 65 read_attribute(state); 66 read_attribute(cache_read_races); 67 read_attribute(writeback_keys_done); 68 read_attribute(writeback_keys_failed); 69 read_attribute(io_errors); 70 read_attribute(congested); 71 rw_attribute(congested_read_threshold_us); 72 rw_attribute(congested_write_threshold_us); 73 74 rw_attribute(sequential_cutoff); 75 rw_attribute(data_csum); 76 rw_attribute(cache_mode); 77 rw_attribute(writeback_metadata); 78 rw_attribute(writeback_running); 79 rw_attribute(writeback_percent); 80 rw_attribute(writeback_delay); 81 rw_attribute(writeback_rate); 82 83 rw_attribute(writeback_rate_update_seconds); 84 rw_attribute(writeback_rate_d_term); 85 rw_attribute(writeback_rate_p_term_inverse); 86 read_attribute(writeback_rate_debug); 87 88 read_attribute(stripe_size); 89 read_attribute(partial_stripes_expensive); 90 91 rw_attribute(synchronous); 92 rw_attribute(journal_delay_ms); 93 rw_attribute(discard); 94 rw_attribute(running); 95 rw_attribute(label); 96 rw_attribute(readahead); 97 rw_attribute(errors); 98 rw_attribute(io_error_limit); 99 rw_attribute(io_error_halflife); 100 rw_attribute(verify); 101 rw_attribute(bypass_torture_test); 102 rw_attribute(key_merging_disabled); 103 rw_attribute(gc_always_rewrite); 104 rw_attribute(expensive_debug_checks); 105 rw_attribute(cache_replacement_policy); 106 rw_attribute(btree_shrinker_disabled); 107 rw_attribute(copy_gc_enabled); 108 rw_attribute(size); 109 110 SHOW(__bch_cached_dev) 111 { 112 struct cached_dev *dc = container_of(kobj, struct cached_dev, 113 disk.kobj); 114 const char *states[] = { "no cache", "clean", "dirty", "inconsistent" }; 115 116 #define var(stat) (dc->stat) 117 118 if (attr == &sysfs_cache_mode) 119 return bch_snprint_string_list(buf, PAGE_SIZE, 120 bch_cache_modes + 1, 121 BDEV_CACHE_MODE(&dc->sb)); 122 123 sysfs_printf(data_csum, "%i", dc->disk.data_csum); 124 var_printf(verify, "%i"); 125 var_printf(bypass_torture_test, "%i"); 126 var_printf(writeback_metadata, "%i"); 127 var_printf(writeback_running, "%i"); 128 var_print(writeback_delay); 129 var_print(writeback_percent); 130 sysfs_hprint(writeback_rate, dc->writeback_rate.rate << 9); 131 132 var_print(writeback_rate_update_seconds); 133 var_print(writeback_rate_d_term); 134 var_print(writeback_rate_p_term_inverse); 135 136 if (attr == &sysfs_writeback_rate_debug) { 137 char rate[20]; 138 char dirty[20]; 139 char target[20]; 140 char proportional[20]; 141 char derivative[20]; 142 char change[20]; 143 s64 next_io; 144 145 bch_hprint(rate, dc->writeback_rate.rate << 9); 146 bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9); 147 bch_hprint(target, dc->writeback_rate_target << 9); 148 bch_hprint(proportional,dc->writeback_rate_proportional << 9); 149 bch_hprint(derivative, dc->writeback_rate_derivative << 9); 150 bch_hprint(change, dc->writeback_rate_change << 9); 151 152 next_io = div64_s64(dc->writeback_rate.next - local_clock(), 153 NSEC_PER_MSEC); 154 155 return sprintf(buf, 156 "rate:\t\t%s/sec\n" 157 "dirty:\t\t%s\n" 158 "target:\t\t%s\n" 159 "proportional:\t%s\n" 160 "derivative:\t%s\n" 161 "change:\t\t%s/sec\n" 162 "next io:\t%llims\n", 163 rate, dirty, target, proportional, 164 derivative, change, next_io); 165 } 166 167 sysfs_hprint(dirty_data, 168 bcache_dev_sectors_dirty(&dc->disk) << 9); 169 170 sysfs_hprint(stripe_size, dc->disk.stripe_size << 9); 171 var_printf(partial_stripes_expensive, "%u"); 172 173 var_hprint(sequential_cutoff); 174 var_hprint(readahead); 175 176 sysfs_print(running, atomic_read(&dc->running)); 177 sysfs_print(state, states[BDEV_STATE(&dc->sb)]); 178 179 if (attr == &sysfs_label) { 180 memcpy(buf, dc->sb.label, SB_LABEL_SIZE); 181 buf[SB_LABEL_SIZE + 1] = '\0'; 182 strcat(buf, "\n"); 183 return strlen(buf); 184 } 185 186 #undef var 187 return 0; 188 } 189 SHOW_LOCKED(bch_cached_dev) 190 191 STORE(__cached_dev) 192 { 193 struct cached_dev *dc = container_of(kobj, struct cached_dev, 194 disk.kobj); 195 unsigned v = size; 196 struct cache_set *c; 197 struct kobj_uevent_env *env; 198 199 #define d_strtoul(var) sysfs_strtoul(var, dc->var) 200 #define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX) 201 #define d_strtoi_h(var) sysfs_hatoi(var, dc->var) 202 203 sysfs_strtoul(data_csum, dc->disk.data_csum); 204 d_strtoul(verify); 205 d_strtoul(bypass_torture_test); 206 d_strtoul(writeback_metadata); 207 d_strtoul(writeback_running); 208 d_strtoul(writeback_delay); 209 210 sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 0, 40); 211 212 sysfs_strtoul_clamp(writeback_rate, 213 dc->writeback_rate.rate, 1, INT_MAX); 214 215 d_strtoul_nonzero(writeback_rate_update_seconds); 216 d_strtoul(writeback_rate_d_term); 217 d_strtoul_nonzero(writeback_rate_p_term_inverse); 218 219 d_strtoi_h(sequential_cutoff); 220 d_strtoi_h(readahead); 221 222 if (attr == &sysfs_clear_stats) 223 bch_cache_accounting_clear(&dc->accounting); 224 225 if (attr == &sysfs_running && 226 strtoul_or_return(buf)) 227 bch_cached_dev_run(dc); 228 229 if (attr == &sysfs_cache_mode) { 230 ssize_t v = bch_read_string_list(buf, bch_cache_modes + 1); 231 232 if (v < 0) 233 return v; 234 235 if ((unsigned) v != BDEV_CACHE_MODE(&dc->sb)) { 236 SET_BDEV_CACHE_MODE(&dc->sb, v); 237 bch_write_bdev_super(dc, NULL); 238 } 239 } 240 241 if (attr == &sysfs_label) { 242 if (size > SB_LABEL_SIZE) 243 return -EINVAL; 244 memcpy(dc->sb.label, buf, size); 245 if (size < SB_LABEL_SIZE) 246 dc->sb.label[size] = '\0'; 247 if (size && dc->sb.label[size - 1] == '\n') 248 dc->sb.label[size - 1] = '\0'; 249 bch_write_bdev_super(dc, NULL); 250 if (dc->disk.c) { 251 memcpy(dc->disk.c->uuids[dc->disk.id].label, 252 buf, SB_LABEL_SIZE); 253 bch_uuid_write(dc->disk.c); 254 } 255 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); 256 if (!env) 257 return -ENOMEM; 258 add_uevent_var(env, "DRIVER=bcache"); 259 add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid), 260 add_uevent_var(env, "CACHED_LABEL=%s", buf); 261 kobject_uevent_env( 262 &disk_to_dev(dc->disk.disk)->kobj, KOBJ_CHANGE, env->envp); 263 kfree(env); 264 } 265 266 if (attr == &sysfs_attach) { 267 if (bch_parse_uuid(buf, dc->sb.set_uuid) < 16) 268 return -EINVAL; 269 270 list_for_each_entry(c, &bch_cache_sets, list) { 271 v = bch_cached_dev_attach(dc, c); 272 if (!v) 273 return size; 274 } 275 276 pr_err("Can't attach %s: cache set not found", buf); 277 size = v; 278 } 279 280 if (attr == &sysfs_detach && dc->disk.c) 281 bch_cached_dev_detach(dc); 282 283 if (attr == &sysfs_stop) 284 bcache_device_stop(&dc->disk); 285 286 return size; 287 } 288 289 STORE(bch_cached_dev) 290 { 291 struct cached_dev *dc = container_of(kobj, struct cached_dev, 292 disk.kobj); 293 294 mutex_lock(&bch_register_lock); 295 size = __cached_dev_store(kobj, attr, buf, size); 296 297 if (attr == &sysfs_writeback_running) 298 bch_writeback_queue(dc); 299 300 if (attr == &sysfs_writeback_percent) 301 schedule_delayed_work(&dc->writeback_rate_update, 302 dc->writeback_rate_update_seconds * HZ); 303 304 mutex_unlock(&bch_register_lock); 305 return size; 306 } 307 308 static struct attribute *bch_cached_dev_files[] = { 309 &sysfs_attach, 310 &sysfs_detach, 311 &sysfs_stop, 312 #if 0 313 &sysfs_data_csum, 314 #endif 315 &sysfs_cache_mode, 316 &sysfs_writeback_metadata, 317 &sysfs_writeback_running, 318 &sysfs_writeback_delay, 319 &sysfs_writeback_percent, 320 &sysfs_writeback_rate, 321 &sysfs_writeback_rate_update_seconds, 322 &sysfs_writeback_rate_d_term, 323 &sysfs_writeback_rate_p_term_inverse, 324 &sysfs_writeback_rate_debug, 325 &sysfs_dirty_data, 326 &sysfs_stripe_size, 327 &sysfs_partial_stripes_expensive, 328 &sysfs_sequential_cutoff, 329 &sysfs_clear_stats, 330 &sysfs_running, 331 &sysfs_state, 332 &sysfs_label, 333 &sysfs_readahead, 334 #ifdef CONFIG_BCACHE_DEBUG 335 &sysfs_verify, 336 &sysfs_bypass_torture_test, 337 #endif 338 NULL 339 }; 340 KTYPE(bch_cached_dev); 341 342 SHOW(bch_flash_dev) 343 { 344 struct bcache_device *d = container_of(kobj, struct bcache_device, 345 kobj); 346 struct uuid_entry *u = &d->c->uuids[d->id]; 347 348 sysfs_printf(data_csum, "%i", d->data_csum); 349 sysfs_hprint(size, u->sectors << 9); 350 351 if (attr == &sysfs_label) { 352 memcpy(buf, u->label, SB_LABEL_SIZE); 353 buf[SB_LABEL_SIZE + 1] = '\0'; 354 strcat(buf, "\n"); 355 return strlen(buf); 356 } 357 358 return 0; 359 } 360 361 STORE(__bch_flash_dev) 362 { 363 struct bcache_device *d = container_of(kobj, struct bcache_device, 364 kobj); 365 struct uuid_entry *u = &d->c->uuids[d->id]; 366 367 sysfs_strtoul(data_csum, d->data_csum); 368 369 if (attr == &sysfs_size) { 370 uint64_t v; 371 strtoi_h_or_return(buf, v); 372 373 u->sectors = v >> 9; 374 bch_uuid_write(d->c); 375 set_capacity(d->disk, u->sectors); 376 } 377 378 if (attr == &sysfs_label) { 379 memcpy(u->label, buf, SB_LABEL_SIZE); 380 bch_uuid_write(d->c); 381 } 382 383 if (attr == &sysfs_unregister) { 384 set_bit(BCACHE_DEV_DETACHING, &d->flags); 385 bcache_device_stop(d); 386 } 387 388 return size; 389 } 390 STORE_LOCKED(bch_flash_dev) 391 392 static struct attribute *bch_flash_dev_files[] = { 393 &sysfs_unregister, 394 #if 0 395 &sysfs_data_csum, 396 #endif 397 &sysfs_label, 398 &sysfs_size, 399 NULL 400 }; 401 KTYPE(bch_flash_dev); 402 403 struct bset_stats_op { 404 struct btree_op op; 405 size_t nodes; 406 struct bset_stats stats; 407 }; 408 409 static int btree_bset_stats(struct btree_op *b_op, struct btree *b) 410 { 411 struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op); 412 413 op->nodes++; 414 bch_btree_keys_stats(&b->keys, &op->stats); 415 416 return MAP_CONTINUE; 417 } 418 419 static int bch_bset_print_stats(struct cache_set *c, char *buf) 420 { 421 struct bset_stats_op op; 422 int ret; 423 424 memset(&op, 0, sizeof(op)); 425 bch_btree_op_init(&op.op, -1); 426 427 ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, btree_bset_stats); 428 if (ret < 0) 429 return ret; 430 431 return snprintf(buf, PAGE_SIZE, 432 "btree nodes: %zu\n" 433 "written sets: %zu\n" 434 "unwritten sets: %zu\n" 435 "written key bytes: %zu\n" 436 "unwritten key bytes: %zu\n" 437 "floats: %zu\n" 438 "failed: %zu\n", 439 op.nodes, 440 op.stats.sets_written, op.stats.sets_unwritten, 441 op.stats.bytes_written, op.stats.bytes_unwritten, 442 op.stats.floats, op.stats.failed); 443 } 444 445 SHOW(__bch_cache_set) 446 { 447 unsigned root_usage(struct cache_set *c) 448 { 449 unsigned bytes = 0; 450 struct bkey *k; 451 struct btree *b; 452 struct btree_iter iter; 453 454 goto lock_root; 455 456 do { 457 rw_unlock(false, b); 458 lock_root: 459 b = c->root; 460 rw_lock(false, b, b->level); 461 } while (b != c->root); 462 463 for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad) 464 bytes += bkey_bytes(k); 465 466 rw_unlock(false, b); 467 468 return (bytes * 100) / btree_bytes(c); 469 } 470 471 size_t cache_size(struct cache_set *c) 472 { 473 size_t ret = 0; 474 struct btree *b; 475 476 mutex_lock(&c->bucket_lock); 477 list_for_each_entry(b, &c->btree_cache, list) 478 ret += 1 << (b->keys.page_order + PAGE_SHIFT); 479 480 mutex_unlock(&c->bucket_lock); 481 return ret; 482 } 483 484 unsigned cache_max_chain(struct cache_set *c) 485 { 486 unsigned ret = 0; 487 struct hlist_head *h; 488 489 mutex_lock(&c->bucket_lock); 490 491 for (h = c->bucket_hash; 492 h < c->bucket_hash + (1 << BUCKET_HASH_BITS); 493 h++) { 494 unsigned i = 0; 495 struct hlist_node *p; 496 497 hlist_for_each(p, h) 498 i++; 499 500 ret = max(ret, i); 501 } 502 503 mutex_unlock(&c->bucket_lock); 504 return ret; 505 } 506 507 unsigned btree_used(struct cache_set *c) 508 { 509 return div64_u64(c->gc_stats.key_bytes * 100, 510 (c->gc_stats.nodes ?: 1) * btree_bytes(c)); 511 } 512 513 unsigned average_key_size(struct cache_set *c) 514 { 515 return c->gc_stats.nkeys 516 ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys) 517 : 0; 518 } 519 520 struct cache_set *c = container_of(kobj, struct cache_set, kobj); 521 522 sysfs_print(synchronous, CACHE_SYNC(&c->sb)); 523 sysfs_print(journal_delay_ms, c->journal_delay_ms); 524 sysfs_hprint(bucket_size, bucket_bytes(c)); 525 sysfs_hprint(block_size, block_bytes(c)); 526 sysfs_print(tree_depth, c->root->level); 527 sysfs_print(root_usage_percent, root_usage(c)); 528 529 sysfs_hprint(btree_cache_size, cache_size(c)); 530 sysfs_print(btree_cache_max_chain, cache_max_chain(c)); 531 sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use); 532 533 sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms); 534 sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us); 535 sysfs_print_time_stats(&c->sort.time, btree_sort, ms, us); 536 sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us); 537 sysfs_print_time_stats(&c->try_harder_time, try_harder, ms, us); 538 539 sysfs_print(btree_used_percent, btree_used(c)); 540 sysfs_print(btree_nodes, c->gc_stats.nodes); 541 sysfs_hprint(average_key_size, average_key_size(c)); 542 543 sysfs_print(cache_read_races, 544 atomic_long_read(&c->cache_read_races)); 545 546 sysfs_print(writeback_keys_done, 547 atomic_long_read(&c->writeback_keys_done)); 548 sysfs_print(writeback_keys_failed, 549 atomic_long_read(&c->writeback_keys_failed)); 550 551 if (attr == &sysfs_errors) 552 return bch_snprint_string_list(buf, PAGE_SIZE, error_actions, 553 c->on_error); 554 555 /* See count_io_errors for why 88 */ 556 sysfs_print(io_error_halflife, c->error_decay * 88); 557 sysfs_print(io_error_limit, c->error_limit >> IO_ERROR_SHIFT); 558 559 sysfs_hprint(congested, 560 ((uint64_t) bch_get_congested(c)) << 9); 561 sysfs_print(congested_read_threshold_us, 562 c->congested_read_threshold_us); 563 sysfs_print(congested_write_threshold_us, 564 c->congested_write_threshold_us); 565 566 sysfs_print(active_journal_entries, fifo_used(&c->journal.pin)); 567 sysfs_printf(verify, "%i", c->verify); 568 sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled); 569 sysfs_printf(expensive_debug_checks, 570 "%i", c->expensive_debug_checks); 571 sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite); 572 sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled); 573 sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled); 574 575 if (attr == &sysfs_bset_tree_stats) 576 return bch_bset_print_stats(c, buf); 577 578 return 0; 579 } 580 SHOW_LOCKED(bch_cache_set) 581 582 STORE(__bch_cache_set) 583 { 584 struct cache_set *c = container_of(kobj, struct cache_set, kobj); 585 586 if (attr == &sysfs_unregister) 587 bch_cache_set_unregister(c); 588 589 if (attr == &sysfs_stop) 590 bch_cache_set_stop(c); 591 592 if (attr == &sysfs_synchronous) { 593 bool sync = strtoul_or_return(buf); 594 595 if (sync != CACHE_SYNC(&c->sb)) { 596 SET_CACHE_SYNC(&c->sb, sync); 597 bcache_write_super(c); 598 } 599 } 600 601 if (attr == &sysfs_flash_vol_create) { 602 int r; 603 uint64_t v; 604 strtoi_h_or_return(buf, v); 605 606 r = bch_flash_dev_create(c, v); 607 if (r) 608 return r; 609 } 610 611 if (attr == &sysfs_clear_stats) { 612 atomic_long_set(&c->writeback_keys_done, 0); 613 atomic_long_set(&c->writeback_keys_failed, 0); 614 615 memset(&c->gc_stats, 0, sizeof(struct gc_stat)); 616 bch_cache_accounting_clear(&c->accounting); 617 } 618 619 if (attr == &sysfs_trigger_gc) 620 wake_up_gc(c); 621 622 if (attr == &sysfs_prune_cache) { 623 struct shrink_control sc; 624 sc.gfp_mask = GFP_KERNEL; 625 sc.nr_to_scan = strtoul_or_return(buf); 626 c->shrink.scan_objects(&c->shrink, &sc); 627 } 628 629 sysfs_strtoul(congested_read_threshold_us, 630 c->congested_read_threshold_us); 631 sysfs_strtoul(congested_write_threshold_us, 632 c->congested_write_threshold_us); 633 634 if (attr == &sysfs_errors) { 635 ssize_t v = bch_read_string_list(buf, error_actions); 636 637 if (v < 0) 638 return v; 639 640 c->on_error = v; 641 } 642 643 if (attr == &sysfs_io_error_limit) 644 c->error_limit = strtoul_or_return(buf) << IO_ERROR_SHIFT; 645 646 /* See count_io_errors() for why 88 */ 647 if (attr == &sysfs_io_error_halflife) 648 c->error_decay = strtoul_or_return(buf) / 88; 649 650 sysfs_strtoul(journal_delay_ms, c->journal_delay_ms); 651 sysfs_strtoul(verify, c->verify); 652 sysfs_strtoul(key_merging_disabled, c->key_merging_disabled); 653 sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks); 654 sysfs_strtoul(gc_always_rewrite, c->gc_always_rewrite); 655 sysfs_strtoul(btree_shrinker_disabled, c->shrinker_disabled); 656 sysfs_strtoul(copy_gc_enabled, c->copy_gc_enabled); 657 658 return size; 659 } 660 STORE_LOCKED(bch_cache_set) 661 662 SHOW(bch_cache_set_internal) 663 { 664 struct cache_set *c = container_of(kobj, struct cache_set, internal); 665 return bch_cache_set_show(&c->kobj, attr, buf); 666 } 667 668 STORE(bch_cache_set_internal) 669 { 670 struct cache_set *c = container_of(kobj, struct cache_set, internal); 671 return bch_cache_set_store(&c->kobj, attr, buf, size); 672 } 673 674 static void bch_cache_set_internal_release(struct kobject *k) 675 { 676 } 677 678 static struct attribute *bch_cache_set_files[] = { 679 &sysfs_unregister, 680 &sysfs_stop, 681 &sysfs_synchronous, 682 &sysfs_journal_delay_ms, 683 &sysfs_flash_vol_create, 684 685 &sysfs_bucket_size, 686 &sysfs_block_size, 687 &sysfs_tree_depth, 688 &sysfs_root_usage_percent, 689 &sysfs_btree_cache_size, 690 &sysfs_cache_available_percent, 691 692 &sysfs_average_key_size, 693 694 &sysfs_errors, 695 &sysfs_io_error_limit, 696 &sysfs_io_error_halflife, 697 &sysfs_congested, 698 &sysfs_congested_read_threshold_us, 699 &sysfs_congested_write_threshold_us, 700 &sysfs_clear_stats, 701 NULL 702 }; 703 KTYPE(bch_cache_set); 704 705 static struct attribute *bch_cache_set_internal_files[] = { 706 &sysfs_active_journal_entries, 707 708 sysfs_time_stats_attribute_list(btree_gc, sec, ms) 709 sysfs_time_stats_attribute_list(btree_split, sec, us) 710 sysfs_time_stats_attribute_list(btree_sort, ms, us) 711 sysfs_time_stats_attribute_list(btree_read, ms, us) 712 sysfs_time_stats_attribute_list(try_harder, ms, us) 713 714 &sysfs_btree_nodes, 715 &sysfs_btree_used_percent, 716 &sysfs_btree_cache_max_chain, 717 718 &sysfs_bset_tree_stats, 719 &sysfs_cache_read_races, 720 &sysfs_writeback_keys_done, 721 &sysfs_writeback_keys_failed, 722 723 &sysfs_trigger_gc, 724 &sysfs_prune_cache, 725 #ifdef CONFIG_BCACHE_DEBUG 726 &sysfs_verify, 727 &sysfs_key_merging_disabled, 728 &sysfs_expensive_debug_checks, 729 #endif 730 &sysfs_gc_always_rewrite, 731 &sysfs_btree_shrinker_disabled, 732 &sysfs_copy_gc_enabled, 733 NULL 734 }; 735 KTYPE(bch_cache_set_internal); 736 737 SHOW(__bch_cache) 738 { 739 struct cache *ca = container_of(kobj, struct cache, kobj); 740 741 sysfs_hprint(bucket_size, bucket_bytes(ca)); 742 sysfs_hprint(block_size, block_bytes(ca)); 743 sysfs_print(nbuckets, ca->sb.nbuckets); 744 sysfs_print(discard, ca->discard); 745 sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9); 746 sysfs_hprint(btree_written, 747 atomic_long_read(&ca->btree_sectors_written) << 9); 748 sysfs_hprint(metadata_written, 749 (atomic_long_read(&ca->meta_sectors_written) + 750 atomic_long_read(&ca->btree_sectors_written)) << 9); 751 752 sysfs_print(io_errors, 753 atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT); 754 755 if (attr == &sysfs_cache_replacement_policy) 756 return bch_snprint_string_list(buf, PAGE_SIZE, 757 cache_replacement_policies, 758 CACHE_REPLACEMENT(&ca->sb)); 759 760 if (attr == &sysfs_priority_stats) { 761 int cmp(const void *l, const void *r) 762 { return *((uint16_t *) r) - *((uint16_t *) l); } 763 764 size_t n = ca->sb.nbuckets, i, unused, btree; 765 uint64_t sum = 0; 766 /* Compute 31 quantiles */ 767 uint16_t q[31], *p, *cached; 768 ssize_t ret; 769 770 cached = p = vmalloc(ca->sb.nbuckets * sizeof(uint16_t)); 771 if (!p) 772 return -ENOMEM; 773 774 mutex_lock(&ca->set->bucket_lock); 775 for (i = ca->sb.first_bucket; i < n; i++) 776 p[i] = ca->buckets[i].prio; 777 mutex_unlock(&ca->set->bucket_lock); 778 779 sort(p, n, sizeof(uint16_t), cmp, NULL); 780 781 while (n && 782 !cached[n - 1]) 783 --n; 784 785 unused = ca->sb.nbuckets - n; 786 787 while (cached < p + n && 788 *cached == BTREE_PRIO) 789 cached++; 790 791 btree = cached - p; 792 n -= btree; 793 794 for (i = 0; i < n; i++) 795 sum += INITIAL_PRIO - cached[i]; 796 797 if (n) 798 do_div(sum, n); 799 800 for (i = 0; i < ARRAY_SIZE(q); i++) 801 q[i] = INITIAL_PRIO - cached[n * (i + 1) / 802 (ARRAY_SIZE(q) + 1)]; 803 804 vfree(p); 805 806 ret = scnprintf(buf, PAGE_SIZE, 807 "Unused: %zu%%\n" 808 "Metadata: %zu%%\n" 809 "Average: %llu\n" 810 "Sectors per Q: %zu\n" 811 "Quantiles: [", 812 unused * 100 / (size_t) ca->sb.nbuckets, 813 btree * 100 / (size_t) ca->sb.nbuckets, sum, 814 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1)); 815 816 for (i = 0; i < ARRAY_SIZE(q); i++) 817 ret += scnprintf(buf + ret, PAGE_SIZE - ret, 818 "%u ", q[i]); 819 ret--; 820 821 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n"); 822 823 return ret; 824 } 825 826 return 0; 827 } 828 SHOW_LOCKED(bch_cache) 829 830 STORE(__bch_cache) 831 { 832 struct cache *ca = container_of(kobj, struct cache, kobj); 833 834 if (attr == &sysfs_discard) { 835 bool v = strtoul_or_return(buf); 836 837 if (blk_queue_discard(bdev_get_queue(ca->bdev))) 838 ca->discard = v; 839 840 if (v != CACHE_DISCARD(&ca->sb)) { 841 SET_CACHE_DISCARD(&ca->sb, v); 842 bcache_write_super(ca->set); 843 } 844 } 845 846 if (attr == &sysfs_cache_replacement_policy) { 847 ssize_t v = bch_read_string_list(buf, cache_replacement_policies); 848 849 if (v < 0) 850 return v; 851 852 if ((unsigned) v != CACHE_REPLACEMENT(&ca->sb)) { 853 mutex_lock(&ca->set->bucket_lock); 854 SET_CACHE_REPLACEMENT(&ca->sb, v); 855 mutex_unlock(&ca->set->bucket_lock); 856 857 bcache_write_super(ca->set); 858 } 859 } 860 861 if (attr == &sysfs_clear_stats) { 862 atomic_long_set(&ca->sectors_written, 0); 863 atomic_long_set(&ca->btree_sectors_written, 0); 864 atomic_long_set(&ca->meta_sectors_written, 0); 865 atomic_set(&ca->io_count, 0); 866 atomic_set(&ca->io_errors, 0); 867 } 868 869 return size; 870 } 871 STORE_LOCKED(bch_cache) 872 873 static struct attribute *bch_cache_files[] = { 874 &sysfs_bucket_size, 875 &sysfs_block_size, 876 &sysfs_nbuckets, 877 &sysfs_priority_stats, 878 &sysfs_discard, 879 &sysfs_written, 880 &sysfs_btree_written, 881 &sysfs_metadata_written, 882 &sysfs_io_errors, 883 &sysfs_clear_stats, 884 &sysfs_cache_replacement_policy, 885 NULL 886 }; 887 KTYPE(bch_cache); 888