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 #include <linux/sched/clock.h> 17 18 static const char * const cache_replacement_policies[] = { 19 "lru", 20 "fifo", 21 "random", 22 NULL 23 }; 24 25 static const char * const error_actions[] = { 26 "unregister", 27 "panic", 28 NULL 29 }; 30 31 write_attribute(attach); 32 write_attribute(detach); 33 write_attribute(unregister); 34 write_attribute(stop); 35 write_attribute(clear_stats); 36 write_attribute(trigger_gc); 37 write_attribute(prune_cache); 38 write_attribute(flash_vol_create); 39 40 read_attribute(bucket_size); 41 read_attribute(block_size); 42 read_attribute(nbuckets); 43 read_attribute(tree_depth); 44 read_attribute(root_usage_percent); 45 read_attribute(priority_stats); 46 read_attribute(btree_cache_size); 47 read_attribute(btree_cache_max_chain); 48 read_attribute(cache_available_percent); 49 read_attribute(written); 50 read_attribute(btree_written); 51 read_attribute(metadata_written); 52 read_attribute(active_journal_entries); 53 54 sysfs_time_stats_attribute(btree_gc, sec, ms); 55 sysfs_time_stats_attribute(btree_split, sec, us); 56 sysfs_time_stats_attribute(btree_sort, ms, us); 57 sysfs_time_stats_attribute(btree_read, 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 bch_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, bch_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 static unsigned bch_root_usage(struct cache_set *c) 446 { 447 unsigned bytes = 0; 448 struct bkey *k; 449 struct btree *b; 450 struct btree_iter iter; 451 452 goto lock_root; 453 454 do { 455 rw_unlock(false, b); 456 lock_root: 457 b = c->root; 458 rw_lock(false, b, b->level); 459 } while (b != c->root); 460 461 for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad) 462 bytes += bkey_bytes(k); 463 464 rw_unlock(false, b); 465 466 return (bytes * 100) / btree_bytes(c); 467 } 468 469 static size_t bch_cache_size(struct cache_set *c) 470 { 471 size_t ret = 0; 472 struct btree *b; 473 474 mutex_lock(&c->bucket_lock); 475 list_for_each_entry(b, &c->btree_cache, list) 476 ret += 1 << (b->keys.page_order + PAGE_SHIFT); 477 478 mutex_unlock(&c->bucket_lock); 479 return ret; 480 } 481 482 static unsigned bch_cache_max_chain(struct cache_set *c) 483 { 484 unsigned ret = 0; 485 struct hlist_head *h; 486 487 mutex_lock(&c->bucket_lock); 488 489 for (h = c->bucket_hash; 490 h < c->bucket_hash + (1 << BUCKET_HASH_BITS); 491 h++) { 492 unsigned i = 0; 493 struct hlist_node *p; 494 495 hlist_for_each(p, h) 496 i++; 497 498 ret = max(ret, i); 499 } 500 501 mutex_unlock(&c->bucket_lock); 502 return ret; 503 } 504 505 static unsigned bch_btree_used(struct cache_set *c) 506 { 507 return div64_u64(c->gc_stats.key_bytes * 100, 508 (c->gc_stats.nodes ?: 1) * btree_bytes(c)); 509 } 510 511 static unsigned bch_average_key_size(struct cache_set *c) 512 { 513 return c->gc_stats.nkeys 514 ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys) 515 : 0; 516 } 517 518 SHOW(__bch_cache_set) 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, bch_root_usage(c)); 528 529 sysfs_hprint(btree_cache_size, bch_cache_size(c)); 530 sysfs_print(btree_cache_max_chain, bch_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); 537 538 sysfs_print(btree_used_percent, bch_btree_used(c)); 539 sysfs_print(btree_nodes, c->gc_stats.nodes); 540 sysfs_hprint(average_key_size, bch_average_key_size(c)); 541 542 sysfs_print(cache_read_races, 543 atomic_long_read(&c->cache_read_races)); 544 545 sysfs_print(writeback_keys_done, 546 atomic_long_read(&c->writeback_keys_done)); 547 sysfs_print(writeback_keys_failed, 548 atomic_long_read(&c->writeback_keys_failed)); 549 550 if (attr == &sysfs_errors) 551 return bch_snprint_string_list(buf, PAGE_SIZE, error_actions, 552 c->on_error); 553 554 /* See count_io_errors for why 88 */ 555 sysfs_print(io_error_halflife, c->error_decay * 88); 556 sysfs_print(io_error_limit, c->error_limit >> IO_ERROR_SHIFT); 557 558 sysfs_hprint(congested, 559 ((uint64_t) bch_get_congested(c)) << 9); 560 sysfs_print(congested_read_threshold_us, 561 c->congested_read_threshold_us); 562 sysfs_print(congested_write_threshold_us, 563 c->congested_write_threshold_us); 564 565 sysfs_print(active_journal_entries, fifo_used(&c->journal.pin)); 566 sysfs_printf(verify, "%i", c->verify); 567 sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled); 568 sysfs_printf(expensive_debug_checks, 569 "%i", c->expensive_debug_checks); 570 sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite); 571 sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled); 572 sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled); 573 574 if (attr == &sysfs_bset_tree_stats) 575 return bch_bset_print_stats(c, buf); 576 577 return 0; 578 } 579 SHOW_LOCKED(bch_cache_set) 580 581 STORE(__bch_cache_set) 582 { 583 struct cache_set *c = container_of(kobj, struct cache_set, kobj); 584 585 if (attr == &sysfs_unregister) 586 bch_cache_set_unregister(c); 587 588 if (attr == &sysfs_stop) 589 bch_cache_set_stop(c); 590 591 if (attr == &sysfs_synchronous) { 592 bool sync = strtoul_or_return(buf); 593 594 if (sync != CACHE_SYNC(&c->sb)) { 595 SET_CACHE_SYNC(&c->sb, sync); 596 bcache_write_super(c); 597 } 598 } 599 600 if (attr == &sysfs_flash_vol_create) { 601 int r; 602 uint64_t v; 603 strtoi_h_or_return(buf, v); 604 605 r = bch_flash_dev_create(c, v); 606 if (r) 607 return r; 608 } 609 610 if (attr == &sysfs_clear_stats) { 611 atomic_long_set(&c->writeback_keys_done, 0); 612 atomic_long_set(&c->writeback_keys_failed, 0); 613 614 memset(&c->gc_stats, 0, sizeof(struct gc_stat)); 615 bch_cache_accounting_clear(&c->accounting); 616 } 617 618 if (attr == &sysfs_trigger_gc) 619 wake_up_gc(c); 620 621 if (attr == &sysfs_prune_cache) { 622 struct shrink_control sc; 623 sc.gfp_mask = GFP_KERNEL; 624 sc.nr_to_scan = strtoul_or_return(buf); 625 c->shrink.scan_objects(&c->shrink, &sc); 626 } 627 628 sysfs_strtoul(congested_read_threshold_us, 629 c->congested_read_threshold_us); 630 sysfs_strtoul(congested_write_threshold_us, 631 c->congested_write_threshold_us); 632 633 if (attr == &sysfs_errors) { 634 ssize_t v = bch_read_string_list(buf, error_actions); 635 636 if (v < 0) 637 return v; 638 639 c->on_error = v; 640 } 641 642 if (attr == &sysfs_io_error_limit) 643 c->error_limit = strtoul_or_return(buf) << IO_ERROR_SHIFT; 644 645 /* See count_io_errors() for why 88 */ 646 if (attr == &sysfs_io_error_halflife) 647 c->error_decay = strtoul_or_return(buf) / 88; 648 649 sysfs_strtoul(journal_delay_ms, c->journal_delay_ms); 650 sysfs_strtoul(verify, c->verify); 651 sysfs_strtoul(key_merging_disabled, c->key_merging_disabled); 652 sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks); 653 sysfs_strtoul(gc_always_rewrite, c->gc_always_rewrite); 654 sysfs_strtoul(btree_shrinker_disabled, c->shrinker_disabled); 655 sysfs_strtoul(copy_gc_enabled, c->copy_gc_enabled); 656 657 return size; 658 } 659 STORE_LOCKED(bch_cache_set) 660 661 SHOW(bch_cache_set_internal) 662 { 663 struct cache_set *c = container_of(kobj, struct cache_set, internal); 664 return bch_cache_set_show(&c->kobj, attr, buf); 665 } 666 667 STORE(bch_cache_set_internal) 668 { 669 struct cache_set *c = container_of(kobj, struct cache_set, internal); 670 return bch_cache_set_store(&c->kobj, attr, buf, size); 671 } 672 673 static void bch_cache_set_internal_release(struct kobject *k) 674 { 675 } 676 677 static struct attribute *bch_cache_set_files[] = { 678 &sysfs_unregister, 679 &sysfs_stop, 680 &sysfs_synchronous, 681 &sysfs_journal_delay_ms, 682 &sysfs_flash_vol_create, 683 684 &sysfs_bucket_size, 685 &sysfs_block_size, 686 &sysfs_tree_depth, 687 &sysfs_root_usage_percent, 688 &sysfs_btree_cache_size, 689 &sysfs_cache_available_percent, 690 691 &sysfs_average_key_size, 692 693 &sysfs_errors, 694 &sysfs_io_error_limit, 695 &sysfs_io_error_halflife, 696 &sysfs_congested, 697 &sysfs_congested_read_threshold_us, 698 &sysfs_congested_write_threshold_us, 699 &sysfs_clear_stats, 700 NULL 701 }; 702 KTYPE(bch_cache_set); 703 704 static struct attribute *bch_cache_set_internal_files[] = { 705 &sysfs_active_journal_entries, 706 707 sysfs_time_stats_attribute_list(btree_gc, sec, ms) 708 sysfs_time_stats_attribute_list(btree_split, sec, us) 709 sysfs_time_stats_attribute_list(btree_sort, ms, us) 710 sysfs_time_stats_attribute_list(btree_read, ms, us) 711 712 &sysfs_btree_nodes, 713 &sysfs_btree_used_percent, 714 &sysfs_btree_cache_max_chain, 715 716 &sysfs_bset_tree_stats, 717 &sysfs_cache_read_races, 718 &sysfs_writeback_keys_done, 719 &sysfs_writeback_keys_failed, 720 721 &sysfs_trigger_gc, 722 &sysfs_prune_cache, 723 #ifdef CONFIG_BCACHE_DEBUG 724 &sysfs_verify, 725 &sysfs_key_merging_disabled, 726 &sysfs_expensive_debug_checks, 727 #endif 728 &sysfs_gc_always_rewrite, 729 &sysfs_btree_shrinker_disabled, 730 &sysfs_copy_gc_enabled, 731 NULL 732 }; 733 KTYPE(bch_cache_set_internal); 734 735 SHOW(__bch_cache) 736 { 737 struct cache *ca = container_of(kobj, struct cache, kobj); 738 739 sysfs_hprint(bucket_size, bucket_bytes(ca)); 740 sysfs_hprint(block_size, block_bytes(ca)); 741 sysfs_print(nbuckets, ca->sb.nbuckets); 742 sysfs_print(discard, ca->discard); 743 sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9); 744 sysfs_hprint(btree_written, 745 atomic_long_read(&ca->btree_sectors_written) << 9); 746 sysfs_hprint(metadata_written, 747 (atomic_long_read(&ca->meta_sectors_written) + 748 atomic_long_read(&ca->btree_sectors_written)) << 9); 749 750 sysfs_print(io_errors, 751 atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT); 752 753 if (attr == &sysfs_cache_replacement_policy) 754 return bch_snprint_string_list(buf, PAGE_SIZE, 755 cache_replacement_policies, 756 CACHE_REPLACEMENT(&ca->sb)); 757 758 if (attr == &sysfs_priority_stats) { 759 int cmp(const void *l, const void *r) 760 { return *((uint16_t *) r) - *((uint16_t *) l); } 761 762 struct bucket *b; 763 size_t n = ca->sb.nbuckets, i; 764 size_t unused = 0, available = 0, dirty = 0, meta = 0; 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_each_bucket(b, ca) { 776 if (!GC_SECTORS_USED(b)) 777 unused++; 778 if (GC_MARK(b) == GC_MARK_RECLAIMABLE) 779 available++; 780 if (GC_MARK(b) == GC_MARK_DIRTY) 781 dirty++; 782 if (GC_MARK(b) == GC_MARK_METADATA) 783 meta++; 784 } 785 786 for (i = ca->sb.first_bucket; i < n; i++) 787 p[i] = ca->buckets[i].prio; 788 mutex_unlock(&ca->set->bucket_lock); 789 790 sort(p, n, sizeof(uint16_t), cmp, NULL); 791 792 while (n && 793 !cached[n - 1]) 794 --n; 795 796 unused = ca->sb.nbuckets - n; 797 798 while (cached < p + n && 799 *cached == BTREE_PRIO) 800 cached++, n--; 801 802 for (i = 0; i < n; i++) 803 sum += INITIAL_PRIO - cached[i]; 804 805 if (n) 806 do_div(sum, n); 807 808 for (i = 0; i < ARRAY_SIZE(q); i++) 809 q[i] = INITIAL_PRIO - cached[n * (i + 1) / 810 (ARRAY_SIZE(q) + 1)]; 811 812 vfree(p); 813 814 ret = scnprintf(buf, PAGE_SIZE, 815 "Unused: %zu%%\n" 816 "Clean: %zu%%\n" 817 "Dirty: %zu%%\n" 818 "Metadata: %zu%%\n" 819 "Average: %llu\n" 820 "Sectors per Q: %zu\n" 821 "Quantiles: [", 822 unused * 100 / (size_t) ca->sb.nbuckets, 823 available * 100 / (size_t) ca->sb.nbuckets, 824 dirty * 100 / (size_t) ca->sb.nbuckets, 825 meta * 100 / (size_t) ca->sb.nbuckets, sum, 826 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1)); 827 828 for (i = 0; i < ARRAY_SIZE(q); i++) 829 ret += scnprintf(buf + ret, PAGE_SIZE - ret, 830 "%u ", q[i]); 831 ret--; 832 833 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n"); 834 835 return ret; 836 } 837 838 return 0; 839 } 840 SHOW_LOCKED(bch_cache) 841 842 STORE(__bch_cache) 843 { 844 struct cache *ca = container_of(kobj, struct cache, kobj); 845 846 if (attr == &sysfs_discard) { 847 bool v = strtoul_or_return(buf); 848 849 if (blk_queue_discard(bdev_get_queue(ca->bdev))) 850 ca->discard = v; 851 852 if (v != CACHE_DISCARD(&ca->sb)) { 853 SET_CACHE_DISCARD(&ca->sb, v); 854 bcache_write_super(ca->set); 855 } 856 } 857 858 if (attr == &sysfs_cache_replacement_policy) { 859 ssize_t v = bch_read_string_list(buf, cache_replacement_policies); 860 861 if (v < 0) 862 return v; 863 864 if ((unsigned) v != CACHE_REPLACEMENT(&ca->sb)) { 865 mutex_lock(&ca->set->bucket_lock); 866 SET_CACHE_REPLACEMENT(&ca->sb, v); 867 mutex_unlock(&ca->set->bucket_lock); 868 869 bcache_write_super(ca->set); 870 } 871 } 872 873 if (attr == &sysfs_clear_stats) { 874 atomic_long_set(&ca->sectors_written, 0); 875 atomic_long_set(&ca->btree_sectors_written, 0); 876 atomic_long_set(&ca->meta_sectors_written, 0); 877 atomic_set(&ca->io_count, 0); 878 atomic_set(&ca->io_errors, 0); 879 } 880 881 return size; 882 } 883 STORE_LOCKED(bch_cache) 884 885 static struct attribute *bch_cache_files[] = { 886 &sysfs_bucket_size, 887 &sysfs_block_size, 888 &sysfs_nbuckets, 889 &sysfs_priority_stats, 890 &sysfs_discard, 891 &sysfs_written, 892 &sysfs_btree_written, 893 &sysfs_metadata_written, 894 &sysfs_io_errors, 895 &sysfs_clear_stats, 896 &sysfs_cache_replacement_policy, 897 NULL 898 }; 899 KTYPE(bch_cache); 900