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