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 #include "features.h" 15 16 #include <linux/blkdev.h> 17 #include <linux/sort.h> 18 #include <linux/sched/clock.h> 19 20 extern bool bcache_is_reboot; 21 22 /* Default is 0 ("writethrough") */ 23 static const char * const bch_cache_modes[] = { 24 "writethrough", 25 "writeback", 26 "writearound", 27 "none", 28 NULL 29 }; 30 31 static const char * const bch_reada_cache_policies[] = { 32 "all", 33 "meta-only", 34 NULL 35 }; 36 37 /* Default is 0 ("auto") */ 38 static const char * const bch_stop_on_failure_modes[] = { 39 "auto", 40 "always", 41 NULL 42 }; 43 44 static const char * const cache_replacement_policies[] = { 45 "lru", 46 "fifo", 47 "random", 48 NULL 49 }; 50 51 static const char * const error_actions[] = { 52 "unregister", 53 "panic", 54 NULL 55 }; 56 57 write_attribute(attach); 58 write_attribute(detach); 59 write_attribute(unregister); 60 write_attribute(stop); 61 write_attribute(clear_stats); 62 write_attribute(trigger_gc); 63 write_attribute(prune_cache); 64 write_attribute(flash_vol_create); 65 66 read_attribute(bucket_size); 67 read_attribute(block_size); 68 read_attribute(nbuckets); 69 read_attribute(tree_depth); 70 read_attribute(root_usage_percent); 71 read_attribute(priority_stats); 72 read_attribute(btree_cache_size); 73 read_attribute(btree_cache_max_chain); 74 read_attribute(cache_available_percent); 75 read_attribute(written); 76 read_attribute(btree_written); 77 read_attribute(metadata_written); 78 read_attribute(active_journal_entries); 79 read_attribute(backing_dev_name); 80 read_attribute(backing_dev_uuid); 81 82 sysfs_time_stats_attribute(btree_gc, sec, ms); 83 sysfs_time_stats_attribute(btree_split, sec, us); 84 sysfs_time_stats_attribute(btree_sort, ms, us); 85 sysfs_time_stats_attribute(btree_read, ms, us); 86 87 read_attribute(btree_nodes); 88 read_attribute(btree_used_percent); 89 read_attribute(average_key_size); 90 read_attribute(dirty_data); 91 read_attribute(bset_tree_stats); 92 read_attribute(feature_compat); 93 read_attribute(feature_ro_compat); 94 read_attribute(feature_incompat); 95 96 read_attribute(state); 97 read_attribute(cache_read_races); 98 read_attribute(reclaim); 99 read_attribute(reclaimed_journal_buckets); 100 read_attribute(flush_write); 101 read_attribute(writeback_keys_done); 102 read_attribute(writeback_keys_failed); 103 read_attribute(io_errors); 104 read_attribute(congested); 105 read_attribute(cutoff_writeback); 106 read_attribute(cutoff_writeback_sync); 107 rw_attribute(congested_read_threshold_us); 108 rw_attribute(congested_write_threshold_us); 109 110 rw_attribute(sequential_cutoff); 111 rw_attribute(data_csum); 112 rw_attribute(cache_mode); 113 rw_attribute(readahead_cache_policy); 114 rw_attribute(stop_when_cache_set_failed); 115 rw_attribute(writeback_metadata); 116 rw_attribute(writeback_running); 117 rw_attribute(writeback_percent); 118 rw_attribute(writeback_delay); 119 rw_attribute(writeback_rate); 120 rw_attribute(writeback_consider_fragment); 121 122 rw_attribute(writeback_rate_update_seconds); 123 rw_attribute(writeback_rate_i_term_inverse); 124 rw_attribute(writeback_rate_p_term_inverse); 125 rw_attribute(writeback_rate_fp_term_low); 126 rw_attribute(writeback_rate_fp_term_mid); 127 rw_attribute(writeback_rate_fp_term_high); 128 rw_attribute(writeback_rate_minimum); 129 read_attribute(writeback_rate_debug); 130 131 read_attribute(stripe_size); 132 read_attribute(partial_stripes_expensive); 133 134 rw_attribute(synchronous); 135 rw_attribute(journal_delay_ms); 136 rw_attribute(io_disable); 137 rw_attribute(discard); 138 rw_attribute(running); 139 rw_attribute(label); 140 rw_attribute(errors); 141 rw_attribute(io_error_limit); 142 rw_attribute(io_error_halflife); 143 rw_attribute(verify); 144 rw_attribute(bypass_torture_test); 145 rw_attribute(key_merging_disabled); 146 rw_attribute(gc_always_rewrite); 147 rw_attribute(expensive_debug_checks); 148 rw_attribute(cache_replacement_policy); 149 rw_attribute(btree_shrinker_disabled); 150 rw_attribute(copy_gc_enabled); 151 rw_attribute(idle_max_writeback_rate); 152 rw_attribute(gc_after_writeback); 153 rw_attribute(size); 154 155 static ssize_t bch_snprint_string_list(char *buf, 156 size_t size, 157 const char * const list[], 158 size_t selected) 159 { 160 char *out = buf; 161 size_t i; 162 163 for (i = 0; list[i]; i++) 164 out += scnprintf(out, buf + size - out, 165 i == selected ? "[%s] " : "%s ", list[i]); 166 167 out[-1] = '\n'; 168 return out - buf; 169 } 170 171 SHOW(__bch_cached_dev) 172 { 173 struct cached_dev *dc = container_of(kobj, struct cached_dev, 174 disk.kobj); 175 char const *states[] = { "no cache", "clean", "dirty", "inconsistent" }; 176 int wb = dc->writeback_running; 177 178 #define var(stat) (dc->stat) 179 180 if (attr == &sysfs_cache_mode) 181 return bch_snprint_string_list(buf, PAGE_SIZE, 182 bch_cache_modes, 183 BDEV_CACHE_MODE(&dc->sb)); 184 185 if (attr == &sysfs_readahead_cache_policy) 186 return bch_snprint_string_list(buf, PAGE_SIZE, 187 bch_reada_cache_policies, 188 dc->cache_readahead_policy); 189 190 if (attr == &sysfs_stop_when_cache_set_failed) 191 return bch_snprint_string_list(buf, PAGE_SIZE, 192 bch_stop_on_failure_modes, 193 dc->stop_when_cache_set_failed); 194 195 196 sysfs_printf(data_csum, "%i", dc->disk.data_csum); 197 var_printf(verify, "%i"); 198 var_printf(bypass_torture_test, "%i"); 199 var_printf(writeback_metadata, "%i"); 200 var_printf(writeback_running, "%i"); 201 var_printf(writeback_consider_fragment, "%i"); 202 var_print(writeback_delay); 203 var_print(writeback_percent); 204 sysfs_hprint(writeback_rate, 205 wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 : 0); 206 sysfs_printf(io_errors, "%i", atomic_read(&dc->io_errors)); 207 sysfs_printf(io_error_limit, "%i", dc->error_limit); 208 sysfs_printf(io_disable, "%i", dc->io_disable); 209 var_print(writeback_rate_update_seconds); 210 var_print(writeback_rate_i_term_inverse); 211 var_print(writeback_rate_p_term_inverse); 212 var_print(writeback_rate_fp_term_low); 213 var_print(writeback_rate_fp_term_mid); 214 var_print(writeback_rate_fp_term_high); 215 var_print(writeback_rate_minimum); 216 217 if (attr == &sysfs_writeback_rate_debug) { 218 char rate[20]; 219 char dirty[20]; 220 char target[20]; 221 char proportional[20]; 222 char integral[20]; 223 char change[20]; 224 s64 next_io; 225 226 /* 227 * Except for dirty and target, other values should 228 * be 0 if writeback is not running. 229 */ 230 bch_hprint(rate, 231 wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 232 : 0); 233 bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9); 234 bch_hprint(target, dc->writeback_rate_target << 9); 235 bch_hprint(proportional, 236 wb ? dc->writeback_rate_proportional << 9 : 0); 237 bch_hprint(integral, 238 wb ? dc->writeback_rate_integral_scaled << 9 : 0); 239 bch_hprint(change, wb ? dc->writeback_rate_change << 9 : 0); 240 next_io = wb ? div64_s64(dc->writeback_rate.next-local_clock(), 241 NSEC_PER_MSEC) : 0; 242 243 return sprintf(buf, 244 "rate:\t\t%s/sec\n" 245 "dirty:\t\t%s\n" 246 "target:\t\t%s\n" 247 "proportional:\t%s\n" 248 "integral:\t%s\n" 249 "change:\t\t%s/sec\n" 250 "next io:\t%llims\n", 251 rate, dirty, target, proportional, 252 integral, change, next_io); 253 } 254 255 sysfs_hprint(dirty_data, 256 bcache_dev_sectors_dirty(&dc->disk) << 9); 257 258 sysfs_hprint(stripe_size, ((uint64_t)dc->disk.stripe_size) << 9); 259 var_printf(partial_stripes_expensive, "%u"); 260 261 var_hprint(sequential_cutoff); 262 263 sysfs_print(running, atomic_read(&dc->running)); 264 sysfs_print(state, states[BDEV_STATE(&dc->sb)]); 265 266 if (attr == &sysfs_label) { 267 memcpy(buf, dc->sb.label, SB_LABEL_SIZE); 268 buf[SB_LABEL_SIZE + 1] = '\0'; 269 strcat(buf, "\n"); 270 return strlen(buf); 271 } 272 273 if (attr == &sysfs_backing_dev_name) { 274 snprintf(buf, BDEVNAME_SIZE + 1, "%s", dc->backing_dev_name); 275 strcat(buf, "\n"); 276 return strlen(buf); 277 } 278 279 if (attr == &sysfs_backing_dev_uuid) { 280 /* convert binary uuid into 36-byte string plus '\0' */ 281 snprintf(buf, 36+1, "%pU", dc->sb.uuid); 282 strcat(buf, "\n"); 283 return strlen(buf); 284 } 285 286 #undef var 287 return 0; 288 } 289 SHOW_LOCKED(bch_cached_dev) 290 291 STORE(__cached_dev) 292 { 293 struct cached_dev *dc = container_of(kobj, struct cached_dev, 294 disk.kobj); 295 ssize_t v; 296 struct cache_set *c; 297 struct kobj_uevent_env *env; 298 299 /* no user space access if system is rebooting */ 300 if (bcache_is_reboot) 301 return -EBUSY; 302 303 #define d_strtoul(var) sysfs_strtoul(var, dc->var) 304 #define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX) 305 #define d_strtoi_h(var) sysfs_hatoi(var, dc->var) 306 307 sysfs_strtoul(data_csum, dc->disk.data_csum); 308 d_strtoul(verify); 309 sysfs_strtoul_bool(bypass_torture_test, dc->bypass_torture_test); 310 sysfs_strtoul_bool(writeback_metadata, dc->writeback_metadata); 311 sysfs_strtoul_bool(writeback_running, dc->writeback_running); 312 sysfs_strtoul_bool(writeback_consider_fragment, dc->writeback_consider_fragment); 313 sysfs_strtoul_clamp(writeback_delay, dc->writeback_delay, 0, UINT_MAX); 314 315 sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 316 0, bch_cutoff_writeback); 317 318 if (attr == &sysfs_writeback_rate) { 319 ssize_t ret; 320 long int v = atomic_long_read(&dc->writeback_rate.rate); 321 322 ret = strtoul_safe_clamp(buf, v, 1, INT_MAX); 323 324 if (!ret) { 325 atomic_long_set(&dc->writeback_rate.rate, v); 326 ret = size; 327 } 328 329 return ret; 330 } 331 332 sysfs_strtoul_clamp(writeback_rate_update_seconds, 333 dc->writeback_rate_update_seconds, 334 1, WRITEBACK_RATE_UPDATE_SECS_MAX); 335 sysfs_strtoul_clamp(writeback_rate_i_term_inverse, 336 dc->writeback_rate_i_term_inverse, 337 1, UINT_MAX); 338 sysfs_strtoul_clamp(writeback_rate_p_term_inverse, 339 dc->writeback_rate_p_term_inverse, 340 1, UINT_MAX); 341 sysfs_strtoul_clamp(writeback_rate_fp_term_low, 342 dc->writeback_rate_fp_term_low, 343 1, dc->writeback_rate_fp_term_mid - 1); 344 sysfs_strtoul_clamp(writeback_rate_fp_term_mid, 345 dc->writeback_rate_fp_term_mid, 346 dc->writeback_rate_fp_term_low + 1, 347 dc->writeback_rate_fp_term_high - 1); 348 sysfs_strtoul_clamp(writeback_rate_fp_term_high, 349 dc->writeback_rate_fp_term_high, 350 dc->writeback_rate_fp_term_mid + 1, UINT_MAX); 351 sysfs_strtoul_clamp(writeback_rate_minimum, 352 dc->writeback_rate_minimum, 353 1, UINT_MAX); 354 355 sysfs_strtoul_clamp(io_error_limit, dc->error_limit, 0, INT_MAX); 356 357 if (attr == &sysfs_io_disable) { 358 int v = strtoul_or_return(buf); 359 360 dc->io_disable = v ? 1 : 0; 361 } 362 363 sysfs_strtoul_clamp(sequential_cutoff, 364 dc->sequential_cutoff, 365 0, UINT_MAX); 366 367 if (attr == &sysfs_clear_stats) 368 bch_cache_accounting_clear(&dc->accounting); 369 370 if (attr == &sysfs_running && 371 strtoul_or_return(buf)) { 372 v = bch_cached_dev_run(dc); 373 if (v) 374 return v; 375 } 376 377 if (attr == &sysfs_cache_mode) { 378 v = __sysfs_match_string(bch_cache_modes, -1, buf); 379 if (v < 0) 380 return v; 381 382 if ((unsigned int) v != BDEV_CACHE_MODE(&dc->sb)) { 383 SET_BDEV_CACHE_MODE(&dc->sb, v); 384 bch_write_bdev_super(dc, NULL); 385 } 386 } 387 388 if (attr == &sysfs_readahead_cache_policy) { 389 v = __sysfs_match_string(bch_reada_cache_policies, -1, buf); 390 if (v < 0) 391 return v; 392 393 if ((unsigned int) v != dc->cache_readahead_policy) 394 dc->cache_readahead_policy = v; 395 } 396 397 if (attr == &sysfs_stop_when_cache_set_failed) { 398 v = __sysfs_match_string(bch_stop_on_failure_modes, -1, buf); 399 if (v < 0) 400 return v; 401 402 dc->stop_when_cache_set_failed = v; 403 } 404 405 if (attr == &sysfs_label) { 406 if (size > SB_LABEL_SIZE) 407 return -EINVAL; 408 memcpy(dc->sb.label, buf, size); 409 if (size < SB_LABEL_SIZE) 410 dc->sb.label[size] = '\0'; 411 if (size && dc->sb.label[size - 1] == '\n') 412 dc->sb.label[size - 1] = '\0'; 413 bch_write_bdev_super(dc, NULL); 414 if (dc->disk.c) { 415 memcpy(dc->disk.c->uuids[dc->disk.id].label, 416 buf, SB_LABEL_SIZE); 417 bch_uuid_write(dc->disk.c); 418 } 419 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); 420 if (!env) 421 return -ENOMEM; 422 add_uevent_var(env, "DRIVER=bcache"); 423 add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid); 424 add_uevent_var(env, "CACHED_LABEL=%s", buf); 425 kobject_uevent_env(&disk_to_dev(dc->disk.disk)->kobj, 426 KOBJ_CHANGE, 427 env->envp); 428 kfree(env); 429 } 430 431 if (attr == &sysfs_attach) { 432 uint8_t set_uuid[16]; 433 434 if (bch_parse_uuid(buf, set_uuid) < 16) 435 return -EINVAL; 436 437 v = -ENOENT; 438 list_for_each_entry(c, &bch_cache_sets, list) { 439 v = bch_cached_dev_attach(dc, c, set_uuid); 440 if (!v) 441 return size; 442 } 443 if (v == -ENOENT) 444 pr_err("Can't attach %s: cache set not found\n", buf); 445 return v; 446 } 447 448 if (attr == &sysfs_detach && dc->disk.c) 449 bch_cached_dev_detach(dc); 450 451 if (attr == &sysfs_stop) 452 bcache_device_stop(&dc->disk); 453 454 return size; 455 } 456 457 STORE(bch_cached_dev) 458 { 459 struct cached_dev *dc = container_of(kobj, struct cached_dev, 460 disk.kobj); 461 462 /* no user space access if system is rebooting */ 463 if (bcache_is_reboot) 464 return -EBUSY; 465 466 mutex_lock(&bch_register_lock); 467 size = __cached_dev_store(kobj, attr, buf, size); 468 469 if (attr == &sysfs_writeback_running) { 470 /* dc->writeback_running changed in __cached_dev_store() */ 471 if (IS_ERR_OR_NULL(dc->writeback_thread)) { 472 /* 473 * reject setting it to 1 via sysfs if writeback 474 * kthread is not created yet. 475 */ 476 if (dc->writeback_running) { 477 dc->writeback_running = false; 478 pr_err("%s: failed to run non-existent writeback thread\n", 479 dc->disk.disk->disk_name); 480 } 481 } else 482 /* 483 * writeback kthread will check if dc->writeback_running 484 * is true or false. 485 */ 486 bch_writeback_queue(dc); 487 } 488 489 /* 490 * Only set BCACHE_DEV_WB_RUNNING when cached device attached to 491 * a cache set, otherwise it doesn't make sense. 492 */ 493 if (attr == &sysfs_writeback_percent) 494 if ((dc->disk.c != NULL) && 495 (!test_and_set_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags))) 496 schedule_delayed_work(&dc->writeback_rate_update, 497 dc->writeback_rate_update_seconds * HZ); 498 499 mutex_unlock(&bch_register_lock); 500 return size; 501 } 502 503 static struct attribute *bch_cached_dev_files[] = { 504 &sysfs_attach, 505 &sysfs_detach, 506 &sysfs_stop, 507 #if 0 508 &sysfs_data_csum, 509 #endif 510 &sysfs_cache_mode, 511 &sysfs_readahead_cache_policy, 512 &sysfs_stop_when_cache_set_failed, 513 &sysfs_writeback_metadata, 514 &sysfs_writeback_running, 515 &sysfs_writeback_delay, 516 &sysfs_writeback_percent, 517 &sysfs_writeback_rate, 518 &sysfs_writeback_consider_fragment, 519 &sysfs_writeback_rate_update_seconds, 520 &sysfs_writeback_rate_i_term_inverse, 521 &sysfs_writeback_rate_p_term_inverse, 522 &sysfs_writeback_rate_fp_term_low, 523 &sysfs_writeback_rate_fp_term_mid, 524 &sysfs_writeback_rate_fp_term_high, 525 &sysfs_writeback_rate_minimum, 526 &sysfs_writeback_rate_debug, 527 &sysfs_io_errors, 528 &sysfs_io_error_limit, 529 &sysfs_io_disable, 530 &sysfs_dirty_data, 531 &sysfs_stripe_size, 532 &sysfs_partial_stripes_expensive, 533 &sysfs_sequential_cutoff, 534 &sysfs_clear_stats, 535 &sysfs_running, 536 &sysfs_state, 537 &sysfs_label, 538 #ifdef CONFIG_BCACHE_DEBUG 539 &sysfs_verify, 540 &sysfs_bypass_torture_test, 541 #endif 542 &sysfs_backing_dev_name, 543 &sysfs_backing_dev_uuid, 544 NULL 545 }; 546 KTYPE(bch_cached_dev); 547 548 SHOW(bch_flash_dev) 549 { 550 struct bcache_device *d = container_of(kobj, struct bcache_device, 551 kobj); 552 struct uuid_entry *u = &d->c->uuids[d->id]; 553 554 sysfs_printf(data_csum, "%i", d->data_csum); 555 sysfs_hprint(size, u->sectors << 9); 556 557 if (attr == &sysfs_label) { 558 memcpy(buf, u->label, SB_LABEL_SIZE); 559 buf[SB_LABEL_SIZE + 1] = '\0'; 560 strcat(buf, "\n"); 561 return strlen(buf); 562 } 563 564 return 0; 565 } 566 567 STORE(__bch_flash_dev) 568 { 569 struct bcache_device *d = container_of(kobj, struct bcache_device, 570 kobj); 571 struct uuid_entry *u = &d->c->uuids[d->id]; 572 573 /* no user space access if system is rebooting */ 574 if (bcache_is_reboot) 575 return -EBUSY; 576 577 sysfs_strtoul(data_csum, d->data_csum); 578 579 if (attr == &sysfs_size) { 580 uint64_t v; 581 582 strtoi_h_or_return(buf, v); 583 584 u->sectors = v >> 9; 585 bch_uuid_write(d->c); 586 set_capacity(d->disk, u->sectors); 587 } 588 589 if (attr == &sysfs_label) { 590 memcpy(u->label, buf, SB_LABEL_SIZE); 591 bch_uuid_write(d->c); 592 } 593 594 if (attr == &sysfs_unregister) { 595 set_bit(BCACHE_DEV_DETACHING, &d->flags); 596 bcache_device_stop(d); 597 } 598 599 return size; 600 } 601 STORE_LOCKED(bch_flash_dev) 602 603 static struct attribute *bch_flash_dev_files[] = { 604 &sysfs_unregister, 605 #if 0 606 &sysfs_data_csum, 607 #endif 608 &sysfs_label, 609 &sysfs_size, 610 NULL 611 }; 612 KTYPE(bch_flash_dev); 613 614 struct bset_stats_op { 615 struct btree_op op; 616 size_t nodes; 617 struct bset_stats stats; 618 }; 619 620 static int bch_btree_bset_stats(struct btree_op *b_op, struct btree *b) 621 { 622 struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op); 623 624 op->nodes++; 625 bch_btree_keys_stats(&b->keys, &op->stats); 626 627 return MAP_CONTINUE; 628 } 629 630 static int bch_bset_print_stats(struct cache_set *c, char *buf) 631 { 632 struct bset_stats_op op; 633 int ret; 634 635 memset(&op, 0, sizeof(op)); 636 bch_btree_op_init(&op.op, -1); 637 638 ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, bch_btree_bset_stats); 639 if (ret < 0) 640 return ret; 641 642 return snprintf(buf, PAGE_SIZE, 643 "btree nodes: %zu\n" 644 "written sets: %zu\n" 645 "unwritten sets: %zu\n" 646 "written key bytes: %zu\n" 647 "unwritten key bytes: %zu\n" 648 "floats: %zu\n" 649 "failed: %zu\n", 650 op.nodes, 651 op.stats.sets_written, op.stats.sets_unwritten, 652 op.stats.bytes_written, op.stats.bytes_unwritten, 653 op.stats.floats, op.stats.failed); 654 } 655 656 static unsigned int bch_root_usage(struct cache_set *c) 657 { 658 unsigned int bytes = 0; 659 struct bkey *k; 660 struct btree *b; 661 struct btree_iter iter; 662 663 goto lock_root; 664 665 do { 666 rw_unlock(false, b); 667 lock_root: 668 b = c->root; 669 rw_lock(false, b, b->level); 670 } while (b != c->root); 671 672 for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad) 673 bytes += bkey_bytes(k); 674 675 rw_unlock(false, b); 676 677 return (bytes * 100) / btree_bytes(c); 678 } 679 680 static size_t bch_cache_size(struct cache_set *c) 681 { 682 size_t ret = 0; 683 struct btree *b; 684 685 mutex_lock(&c->bucket_lock); 686 list_for_each_entry(b, &c->btree_cache, list) 687 ret += 1 << (b->keys.page_order + PAGE_SHIFT); 688 689 mutex_unlock(&c->bucket_lock); 690 return ret; 691 } 692 693 static unsigned int bch_cache_max_chain(struct cache_set *c) 694 { 695 unsigned int ret = 0; 696 struct hlist_head *h; 697 698 mutex_lock(&c->bucket_lock); 699 700 for (h = c->bucket_hash; 701 h < c->bucket_hash + (1 << BUCKET_HASH_BITS); 702 h++) { 703 unsigned int i = 0; 704 struct hlist_node *p; 705 706 hlist_for_each(p, h) 707 i++; 708 709 ret = max(ret, i); 710 } 711 712 mutex_unlock(&c->bucket_lock); 713 return ret; 714 } 715 716 static unsigned int bch_btree_used(struct cache_set *c) 717 { 718 return div64_u64(c->gc_stats.key_bytes * 100, 719 (c->gc_stats.nodes ?: 1) * btree_bytes(c)); 720 } 721 722 static unsigned int bch_average_key_size(struct cache_set *c) 723 { 724 return c->gc_stats.nkeys 725 ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys) 726 : 0; 727 } 728 729 SHOW(__bch_cache_set) 730 { 731 struct cache_set *c = container_of(kobj, struct cache_set, kobj); 732 733 sysfs_print(synchronous, CACHE_SYNC(&c->cache->sb)); 734 sysfs_print(journal_delay_ms, c->journal_delay_ms); 735 sysfs_hprint(bucket_size, bucket_bytes(c->cache)); 736 sysfs_hprint(block_size, block_bytes(c->cache)); 737 sysfs_print(tree_depth, c->root->level); 738 sysfs_print(root_usage_percent, bch_root_usage(c)); 739 740 sysfs_hprint(btree_cache_size, bch_cache_size(c)); 741 sysfs_print(btree_cache_max_chain, bch_cache_max_chain(c)); 742 sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use); 743 744 sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms); 745 sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us); 746 sysfs_print_time_stats(&c->sort.time, btree_sort, ms, us); 747 sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us); 748 749 sysfs_print(btree_used_percent, bch_btree_used(c)); 750 sysfs_print(btree_nodes, c->gc_stats.nodes); 751 sysfs_hprint(average_key_size, bch_average_key_size(c)); 752 753 sysfs_print(cache_read_races, 754 atomic_long_read(&c->cache_read_races)); 755 756 sysfs_print(reclaim, 757 atomic_long_read(&c->reclaim)); 758 759 sysfs_print(reclaimed_journal_buckets, 760 atomic_long_read(&c->reclaimed_journal_buckets)); 761 762 sysfs_print(flush_write, 763 atomic_long_read(&c->flush_write)); 764 765 sysfs_print(writeback_keys_done, 766 atomic_long_read(&c->writeback_keys_done)); 767 sysfs_print(writeback_keys_failed, 768 atomic_long_read(&c->writeback_keys_failed)); 769 770 if (attr == &sysfs_errors) 771 return bch_snprint_string_list(buf, PAGE_SIZE, error_actions, 772 c->on_error); 773 774 /* See count_io_errors for why 88 */ 775 sysfs_print(io_error_halflife, c->error_decay * 88); 776 sysfs_print(io_error_limit, c->error_limit); 777 778 sysfs_hprint(congested, 779 ((uint64_t) bch_get_congested(c)) << 9); 780 sysfs_print(congested_read_threshold_us, 781 c->congested_read_threshold_us); 782 sysfs_print(congested_write_threshold_us, 783 c->congested_write_threshold_us); 784 785 sysfs_print(cutoff_writeback, bch_cutoff_writeback); 786 sysfs_print(cutoff_writeback_sync, bch_cutoff_writeback_sync); 787 788 sysfs_print(active_journal_entries, fifo_used(&c->journal.pin)); 789 sysfs_printf(verify, "%i", c->verify); 790 sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled); 791 sysfs_printf(expensive_debug_checks, 792 "%i", c->expensive_debug_checks); 793 sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite); 794 sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled); 795 sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled); 796 sysfs_printf(idle_max_writeback_rate, "%i", 797 c->idle_max_writeback_rate_enabled); 798 sysfs_printf(gc_after_writeback, "%i", c->gc_after_writeback); 799 sysfs_printf(io_disable, "%i", 800 test_bit(CACHE_SET_IO_DISABLE, &c->flags)); 801 802 if (attr == &sysfs_bset_tree_stats) 803 return bch_bset_print_stats(c, buf); 804 805 if (attr == &sysfs_feature_compat) 806 return bch_print_cache_set_feature_compat(c, buf, PAGE_SIZE); 807 if (attr == &sysfs_feature_ro_compat) 808 return bch_print_cache_set_feature_ro_compat(c, buf, PAGE_SIZE); 809 if (attr == &sysfs_feature_incompat) 810 return bch_print_cache_set_feature_incompat(c, buf, PAGE_SIZE); 811 812 return 0; 813 } 814 SHOW_LOCKED(bch_cache_set) 815 816 STORE(__bch_cache_set) 817 { 818 struct cache_set *c = container_of(kobj, struct cache_set, kobj); 819 ssize_t v; 820 821 /* no user space access if system is rebooting */ 822 if (bcache_is_reboot) 823 return -EBUSY; 824 825 if (attr == &sysfs_unregister) 826 bch_cache_set_unregister(c); 827 828 if (attr == &sysfs_stop) 829 bch_cache_set_stop(c); 830 831 if (attr == &sysfs_synchronous) { 832 bool sync = strtoul_or_return(buf); 833 834 if (sync != CACHE_SYNC(&c->cache->sb)) { 835 SET_CACHE_SYNC(&c->cache->sb, sync); 836 bcache_write_super(c); 837 } 838 } 839 840 if (attr == &sysfs_flash_vol_create) { 841 int r; 842 uint64_t v; 843 844 strtoi_h_or_return(buf, v); 845 846 r = bch_flash_dev_create(c, v); 847 if (r) 848 return r; 849 } 850 851 if (attr == &sysfs_clear_stats) { 852 atomic_long_set(&c->writeback_keys_done, 0); 853 atomic_long_set(&c->writeback_keys_failed, 0); 854 855 memset(&c->gc_stats, 0, sizeof(struct gc_stat)); 856 bch_cache_accounting_clear(&c->accounting); 857 } 858 859 if (attr == &sysfs_trigger_gc) 860 force_wake_up_gc(c); 861 862 if (attr == &sysfs_prune_cache) { 863 struct shrink_control sc; 864 865 sc.gfp_mask = GFP_KERNEL; 866 sc.nr_to_scan = strtoul_or_return(buf); 867 c->shrink.scan_objects(&c->shrink, &sc); 868 } 869 870 sysfs_strtoul_clamp(congested_read_threshold_us, 871 c->congested_read_threshold_us, 872 0, UINT_MAX); 873 sysfs_strtoul_clamp(congested_write_threshold_us, 874 c->congested_write_threshold_us, 875 0, UINT_MAX); 876 877 if (attr == &sysfs_errors) { 878 v = __sysfs_match_string(error_actions, -1, buf); 879 if (v < 0) 880 return v; 881 882 c->on_error = v; 883 } 884 885 sysfs_strtoul_clamp(io_error_limit, c->error_limit, 0, UINT_MAX); 886 887 /* See count_io_errors() for why 88 */ 888 if (attr == &sysfs_io_error_halflife) { 889 unsigned long v = 0; 890 ssize_t ret; 891 892 ret = strtoul_safe_clamp(buf, v, 0, UINT_MAX); 893 if (!ret) { 894 c->error_decay = v / 88; 895 return size; 896 } 897 return ret; 898 } 899 900 if (attr == &sysfs_io_disable) { 901 v = strtoul_or_return(buf); 902 if (v) { 903 if (test_and_set_bit(CACHE_SET_IO_DISABLE, 904 &c->flags)) 905 pr_warn("CACHE_SET_IO_DISABLE already set\n"); 906 } else { 907 if (!test_and_clear_bit(CACHE_SET_IO_DISABLE, 908 &c->flags)) 909 pr_warn("CACHE_SET_IO_DISABLE already cleared\n"); 910 } 911 } 912 913 sysfs_strtoul_clamp(journal_delay_ms, 914 c->journal_delay_ms, 915 0, USHRT_MAX); 916 sysfs_strtoul_bool(verify, c->verify); 917 sysfs_strtoul_bool(key_merging_disabled, c->key_merging_disabled); 918 sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks); 919 sysfs_strtoul_bool(gc_always_rewrite, c->gc_always_rewrite); 920 sysfs_strtoul_bool(btree_shrinker_disabled, c->shrinker_disabled); 921 sysfs_strtoul_bool(copy_gc_enabled, c->copy_gc_enabled); 922 sysfs_strtoul_bool(idle_max_writeback_rate, 923 c->idle_max_writeback_rate_enabled); 924 925 /* 926 * write gc_after_writeback here may overwrite an already set 927 * BCH_DO_AUTO_GC, it doesn't matter because this flag will be 928 * set in next chance. 929 */ 930 sysfs_strtoul_clamp(gc_after_writeback, c->gc_after_writeback, 0, 1); 931 932 return size; 933 } 934 STORE_LOCKED(bch_cache_set) 935 936 SHOW(bch_cache_set_internal) 937 { 938 struct cache_set *c = container_of(kobj, struct cache_set, internal); 939 940 return bch_cache_set_show(&c->kobj, attr, buf); 941 } 942 943 STORE(bch_cache_set_internal) 944 { 945 struct cache_set *c = container_of(kobj, struct cache_set, internal); 946 947 /* no user space access if system is rebooting */ 948 if (bcache_is_reboot) 949 return -EBUSY; 950 951 return bch_cache_set_store(&c->kobj, attr, buf, size); 952 } 953 954 static void bch_cache_set_internal_release(struct kobject *k) 955 { 956 } 957 958 static struct attribute *bch_cache_set_files[] = { 959 &sysfs_unregister, 960 &sysfs_stop, 961 &sysfs_synchronous, 962 &sysfs_journal_delay_ms, 963 &sysfs_flash_vol_create, 964 965 &sysfs_bucket_size, 966 &sysfs_block_size, 967 &sysfs_tree_depth, 968 &sysfs_root_usage_percent, 969 &sysfs_btree_cache_size, 970 &sysfs_cache_available_percent, 971 972 &sysfs_average_key_size, 973 974 &sysfs_errors, 975 &sysfs_io_error_limit, 976 &sysfs_io_error_halflife, 977 &sysfs_congested, 978 &sysfs_congested_read_threshold_us, 979 &sysfs_congested_write_threshold_us, 980 &sysfs_clear_stats, 981 NULL 982 }; 983 KTYPE(bch_cache_set); 984 985 static struct attribute *bch_cache_set_internal_files[] = { 986 &sysfs_active_journal_entries, 987 988 sysfs_time_stats_attribute_list(btree_gc, sec, ms) 989 sysfs_time_stats_attribute_list(btree_split, sec, us) 990 sysfs_time_stats_attribute_list(btree_sort, ms, us) 991 sysfs_time_stats_attribute_list(btree_read, ms, us) 992 993 &sysfs_btree_nodes, 994 &sysfs_btree_used_percent, 995 &sysfs_btree_cache_max_chain, 996 997 &sysfs_bset_tree_stats, 998 &sysfs_cache_read_races, 999 &sysfs_reclaim, 1000 &sysfs_reclaimed_journal_buckets, 1001 &sysfs_flush_write, 1002 &sysfs_writeback_keys_done, 1003 &sysfs_writeback_keys_failed, 1004 1005 &sysfs_trigger_gc, 1006 &sysfs_prune_cache, 1007 #ifdef CONFIG_BCACHE_DEBUG 1008 &sysfs_verify, 1009 &sysfs_key_merging_disabled, 1010 &sysfs_expensive_debug_checks, 1011 #endif 1012 &sysfs_gc_always_rewrite, 1013 &sysfs_btree_shrinker_disabled, 1014 &sysfs_copy_gc_enabled, 1015 &sysfs_idle_max_writeback_rate, 1016 &sysfs_gc_after_writeback, 1017 &sysfs_io_disable, 1018 &sysfs_cutoff_writeback, 1019 &sysfs_cutoff_writeback_sync, 1020 &sysfs_feature_compat, 1021 &sysfs_feature_ro_compat, 1022 &sysfs_feature_incompat, 1023 NULL 1024 }; 1025 KTYPE(bch_cache_set_internal); 1026 1027 static int __bch_cache_cmp(const void *l, const void *r) 1028 { 1029 cond_resched(); 1030 return *((uint16_t *)r) - *((uint16_t *)l); 1031 } 1032 1033 SHOW(__bch_cache) 1034 { 1035 struct cache *ca = container_of(kobj, struct cache, kobj); 1036 1037 sysfs_hprint(bucket_size, bucket_bytes(ca)); 1038 sysfs_hprint(block_size, block_bytes(ca)); 1039 sysfs_print(nbuckets, ca->sb.nbuckets); 1040 sysfs_print(discard, ca->discard); 1041 sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9); 1042 sysfs_hprint(btree_written, 1043 atomic_long_read(&ca->btree_sectors_written) << 9); 1044 sysfs_hprint(metadata_written, 1045 (atomic_long_read(&ca->meta_sectors_written) + 1046 atomic_long_read(&ca->btree_sectors_written)) << 9); 1047 1048 sysfs_print(io_errors, 1049 atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT); 1050 1051 if (attr == &sysfs_cache_replacement_policy) 1052 return bch_snprint_string_list(buf, PAGE_SIZE, 1053 cache_replacement_policies, 1054 CACHE_REPLACEMENT(&ca->sb)); 1055 1056 if (attr == &sysfs_priority_stats) { 1057 struct bucket *b; 1058 size_t n = ca->sb.nbuckets, i; 1059 size_t unused = 0, available = 0, dirty = 0, meta = 0; 1060 uint64_t sum = 0; 1061 /* Compute 31 quantiles */ 1062 uint16_t q[31], *p, *cached; 1063 ssize_t ret; 1064 1065 cached = p = vmalloc(array_size(sizeof(uint16_t), 1066 ca->sb.nbuckets)); 1067 if (!p) 1068 return -ENOMEM; 1069 1070 mutex_lock(&ca->set->bucket_lock); 1071 for_each_bucket(b, ca) { 1072 if (!GC_SECTORS_USED(b)) 1073 unused++; 1074 if (GC_MARK(b) == GC_MARK_RECLAIMABLE) 1075 available++; 1076 if (GC_MARK(b) == GC_MARK_DIRTY) 1077 dirty++; 1078 if (GC_MARK(b) == GC_MARK_METADATA) 1079 meta++; 1080 } 1081 1082 for (i = ca->sb.first_bucket; i < n; i++) 1083 p[i] = ca->buckets[i].prio; 1084 mutex_unlock(&ca->set->bucket_lock); 1085 1086 sort(p, n, sizeof(uint16_t), __bch_cache_cmp, NULL); 1087 1088 while (n && 1089 !cached[n - 1]) 1090 --n; 1091 1092 while (cached < p + n && 1093 *cached == BTREE_PRIO) { 1094 cached++; 1095 n--; 1096 } 1097 1098 for (i = 0; i < n; i++) 1099 sum += INITIAL_PRIO - cached[i]; 1100 1101 if (n) 1102 do_div(sum, n); 1103 1104 for (i = 0; i < ARRAY_SIZE(q); i++) 1105 q[i] = INITIAL_PRIO - cached[n * (i + 1) / 1106 (ARRAY_SIZE(q) + 1)]; 1107 1108 vfree(p); 1109 1110 ret = scnprintf(buf, PAGE_SIZE, 1111 "Unused: %zu%%\n" 1112 "Clean: %zu%%\n" 1113 "Dirty: %zu%%\n" 1114 "Metadata: %zu%%\n" 1115 "Average: %llu\n" 1116 "Sectors per Q: %zu\n" 1117 "Quantiles: [", 1118 unused * 100 / (size_t) ca->sb.nbuckets, 1119 available * 100 / (size_t) ca->sb.nbuckets, 1120 dirty * 100 / (size_t) ca->sb.nbuckets, 1121 meta * 100 / (size_t) ca->sb.nbuckets, sum, 1122 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1)); 1123 1124 for (i = 0; i < ARRAY_SIZE(q); i++) 1125 ret += scnprintf(buf + ret, PAGE_SIZE - ret, 1126 "%u ", q[i]); 1127 ret--; 1128 1129 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n"); 1130 1131 return ret; 1132 } 1133 1134 return 0; 1135 } 1136 SHOW_LOCKED(bch_cache) 1137 1138 STORE(__bch_cache) 1139 { 1140 struct cache *ca = container_of(kobj, struct cache, kobj); 1141 ssize_t v; 1142 1143 /* no user space access if system is rebooting */ 1144 if (bcache_is_reboot) 1145 return -EBUSY; 1146 1147 if (attr == &sysfs_discard) { 1148 bool v = strtoul_or_return(buf); 1149 1150 if (blk_queue_discard(bdev_get_queue(ca->bdev))) 1151 ca->discard = v; 1152 1153 if (v != CACHE_DISCARD(&ca->sb)) { 1154 SET_CACHE_DISCARD(&ca->sb, v); 1155 bcache_write_super(ca->set); 1156 } 1157 } 1158 1159 if (attr == &sysfs_cache_replacement_policy) { 1160 v = __sysfs_match_string(cache_replacement_policies, -1, buf); 1161 if (v < 0) 1162 return v; 1163 1164 if ((unsigned int) v != CACHE_REPLACEMENT(&ca->sb)) { 1165 mutex_lock(&ca->set->bucket_lock); 1166 SET_CACHE_REPLACEMENT(&ca->sb, v); 1167 mutex_unlock(&ca->set->bucket_lock); 1168 1169 bcache_write_super(ca->set); 1170 } 1171 } 1172 1173 if (attr == &sysfs_clear_stats) { 1174 atomic_long_set(&ca->sectors_written, 0); 1175 atomic_long_set(&ca->btree_sectors_written, 0); 1176 atomic_long_set(&ca->meta_sectors_written, 0); 1177 atomic_set(&ca->io_count, 0); 1178 atomic_set(&ca->io_errors, 0); 1179 } 1180 1181 return size; 1182 } 1183 STORE_LOCKED(bch_cache) 1184 1185 static struct attribute *bch_cache_files[] = { 1186 &sysfs_bucket_size, 1187 &sysfs_block_size, 1188 &sysfs_nbuckets, 1189 &sysfs_priority_stats, 1190 &sysfs_discard, 1191 &sysfs_written, 1192 &sysfs_btree_written, 1193 &sysfs_metadata_written, 1194 &sysfs_io_errors, 1195 &sysfs_clear_stats, 1196 &sysfs_cache_replacement_policy, 1197 NULL 1198 }; 1199 KTYPE(bch_cache); 1200