drivers/md/bcache/sysfs.c

   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 SHOW(__bch_cache_set)
 404 {
 405         unsigned root_usage(struct cache_set *c)
 406         {
 407                 unsigned bytes = 0;
 408                 struct bkey *k;
 409                 struct btree *b;
 410                 struct btree_iter iter;
 411
 412                 goto lock_root;
 413
 414                 do {
 415                         rw_unlock(false, b);
 416 lock_root:
 417                         b = c->root;
 418                         rw_lock(false, b, b->level);
 419                 } while (b != c->root);
 420
 421                 for_each_key_filter(b, k, &iter, bch_ptr_bad)
 422                         bytes += bkey_bytes(k);
 423
 424                 rw_unlock(false, b);
 425
 426                 return (bytes * 100) / btree_bytes(c);
 427         }
 428
 429         size_t cache_size(struct cache_set *c)
 430         {
 431                 size_t ret = 0;
 432                 struct btree *b;
 433
 434                 mutex_lock(&c->bucket_lock);
 435                 list_for_each_entry(b, &c->btree_cache, list)
 436                         ret += 1 << (b->keys.page_order + PAGE_SHIFT);
 437
 438                 mutex_unlock(&c->bucket_lock);
 439                 return ret;
 440         }
 441
 442         unsigned cache_max_chain(struct cache_set *c)
 443         {
 444                 unsigned ret = 0;
 445                 struct hlist_head *h;
 446
 447                 mutex_lock(&c->bucket_lock);
 448
 449                 for (h = c->bucket_hash;
 450                      h < c->bucket_hash + (1 << BUCKET_HASH_BITS);
 451                      h++) {
 452                         unsigned i = 0;
 453                         struct hlist_node *p;
 454
 455                         hlist_for_each(p, h)
 456                                 i++;
 457
 458                         ret = max(ret, i);
 459                 }
 460
 461                 mutex_unlock(&c->bucket_lock);
 462                 return ret;
 463         }
 464
 465         unsigned btree_used(struct cache_set *c)
 466         {
 467                 return div64_u64(c->gc_stats.key_bytes * 100,
 468                                  (c->gc_stats.nodes ?: 1) * btree_bytes(c));
 469         }
 470
 471         unsigned average_key_size(struct cache_set *c)
 472         {
 473                 return c->gc_stats.nkeys
 474                         ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys)
 475                         : 0;
 476         }
 477
 478         struct cache_set *c = container_of(kobj, struct cache_set, kobj);
 479
 480         sysfs_print(synchronous,                CACHE_SYNC(&c->sb));
 481         sysfs_print(journal_delay_ms,           c->journal_delay_ms);
 482         sysfs_hprint(bucket_size,               bucket_bytes(c));
 483         sysfs_hprint(block_size,                block_bytes(c));
 484         sysfs_print(tree_depth,                 c->root->level);
 485         sysfs_print(root_usage_percent,         root_usage(c));
 486
 487         sysfs_hprint(btree_cache_size,          cache_size(c));
 488         sysfs_print(btree_cache_max_chain,      cache_max_chain(c));
 489         sysfs_print(cache_available_percent,    100 - c->gc_stats.in_use);
 490
 491         sysfs_print_time_stats(&c->btree_gc_time,       btree_gc, sec, ms);
 492         sysfs_print_time_stats(&c->btree_split_time,    btree_split, sec, us);
 493         sysfs_print_time_stats(&c->sort.time,           btree_sort, ms, us);
 494         sysfs_print_time_stats(&c->btree_read_time,     btree_read, ms, us);
 495         sysfs_print_time_stats(&c->try_harder_time,     try_harder, ms, us);
 496
 497         sysfs_print(btree_used_percent, btree_used(c));
 498         sysfs_print(btree_nodes,        c->gc_stats.nodes);
 499         sysfs_hprint(average_key_size,  average_key_size(c));
 500
 501         sysfs_print(cache_read_races,
 502                     atomic_long_read(&c->cache_read_races));
 503
 504         sysfs_print(writeback_keys_done,
 505                     atomic_long_read(&c->writeback_keys_done));
 506         sysfs_print(writeback_keys_failed,
 507                     atomic_long_read(&c->writeback_keys_failed));
 508
 509         if (attr == &sysfs_errors)
 510                 return bch_snprint_string_list(buf, PAGE_SIZE, error_actions,
 511                                                c->on_error);
 512
 513         /* See count_io_errors for why 88 */
 514         sysfs_print(io_error_halflife,  c->error_decay * 88);
 515         sysfs_print(io_error_limit,     c->error_limit >> IO_ERROR_SHIFT);
 516
 517         sysfs_hprint(congested,
 518                      ((uint64_t) bch_get_congested(c)) << 9);
 519         sysfs_print(congested_read_threshold_us,
 520                     c->congested_read_threshold_us);
 521         sysfs_print(congested_write_threshold_us,
 522                     c->congested_write_threshold_us);
 523
 524         sysfs_print(active_journal_entries,     fifo_used(&c->journal.pin));
 525         sysfs_printf(verify,                    "%i", c->verify);
 526         sysfs_printf(key_merging_disabled,      "%i", c->key_merging_disabled);
 527         sysfs_printf(expensive_debug_checks,
 528                      "%i", c->expensive_debug_checks);
 529         sysfs_printf(gc_always_rewrite,         "%i", c->gc_always_rewrite);
 530         sysfs_printf(btree_shrinker_disabled,   "%i", c->shrinker_disabled);
 531         sysfs_printf(copy_gc_enabled,           "%i", c->copy_gc_enabled);
 532
 533         if (attr == &sysfs_bset_tree_stats)
 534                 return bch_bset_print_stats(c, buf);
 535
 536         return 0;
 537 }
 538 SHOW_LOCKED(bch_cache_set)
 539
 540 STORE(__bch_cache_set)
 541 {
 542         struct cache_set *c = container_of(kobj, struct cache_set, kobj);
 543
 544         if (attr == &sysfs_unregister)
 545                 bch_cache_set_unregister(c);
 546
 547         if (attr == &sysfs_stop)
 548                 bch_cache_set_stop(c);
 549
 550         if (attr == &sysfs_synchronous) {
 551                 bool sync = strtoul_or_return(buf);
 552
 553                 if (sync != CACHE_SYNC(&c->sb)) {
 554                         SET_CACHE_SYNC(&c->sb, sync);
 555                         bcache_write_super(c);
 556                 }
 557         }
 558
 559         if (attr == &sysfs_flash_vol_create) {
 560                 int r;
 561                 uint64_t v;
 562                 strtoi_h_or_return(buf, v);
 563
 564                 r = bch_flash_dev_create(c, v);
 565                 if (r)
 566                         return r;
 567         }
 568
 569         if (attr == &sysfs_clear_stats) {
 570                 atomic_long_set(&c->writeback_keys_done,        0);
 571                 atomic_long_set(&c->writeback_keys_failed,      0);
 572
 573                 memset(&c->gc_stats, 0, sizeof(struct gc_stat));
 574                 bch_cache_accounting_clear(&c->accounting);
 575         }
 576
 577         if (attr == &sysfs_trigger_gc)
 578                 wake_up_gc(c);
 579
 580         if (attr == &sysfs_prune_cache) {
 581                 struct shrink_control sc;
 582                 sc.gfp_mask = GFP_KERNEL;
 583                 sc.nr_to_scan = strtoul_or_return(buf);
 584                 c->shrink.scan_objects(&c->shrink, &sc);
 585         }
 586
 587         sysfs_strtoul(congested_read_threshold_us,
 588                       c->congested_read_threshold_us);
 589         sysfs_strtoul(congested_write_threshold_us,
 590                       c->congested_write_threshold_us);
 591
 592         if (attr == &sysfs_errors) {
 593                 ssize_t v = bch_read_string_list(buf, error_actions);
 594
 595                 if (v < 0)
 596                         return v;
 597
 598                 c->on_error = v;
 599         }
 600
 601         if (attr == &sysfs_io_error_limit)
 602                 c->error_limit = strtoul_or_return(buf) << IO_ERROR_SHIFT;
 603
 604         /* See count_io_errors() for why 88 */
 605         if (attr == &sysfs_io_error_halflife)
 606                 c->error_decay = strtoul_or_return(buf) / 88;
 607
 608         sysfs_strtoul(journal_delay_ms,         c->journal_delay_ms);
 609         sysfs_strtoul(verify,                   c->verify);
 610         sysfs_strtoul(key_merging_disabled,     c->key_merging_disabled);
 611         sysfs_strtoul(expensive_debug_checks,   c->expensive_debug_checks);
 612         sysfs_strtoul(gc_always_rewrite,        c->gc_always_rewrite);
 613         sysfs_strtoul(btree_shrinker_disabled,  c->shrinker_disabled);
 614         sysfs_strtoul(copy_gc_enabled,          c->copy_gc_enabled);
 615
 616         return size;
 617 }
 618 STORE_LOCKED(bch_cache_set)
 619
 620 SHOW(bch_cache_set_internal)
 621 {
 622         struct cache_set *c = container_of(kobj, struct cache_set, internal);
 623         return bch_cache_set_show(&c->kobj, attr, buf);
 624 }
 625
 626 STORE(bch_cache_set_internal)
 627 {
 628         struct cache_set *c = container_of(kobj, struct cache_set, internal);
 629         return bch_cache_set_store(&c->kobj, attr, buf, size);
 630 }
 631
 632 static void bch_cache_set_internal_release(struct kobject *k)
 633 {
 634 }
 635
 636 static struct attribute *bch_cache_set_files[] = {
 637         &sysfs_unregister,
 638         &sysfs_stop,
 639         &sysfs_synchronous,
 640         &sysfs_journal_delay_ms,
 641         &sysfs_flash_vol_create,
 642
 643         &sysfs_bucket_size,
 644         &sysfs_block_size,
 645         &sysfs_tree_depth,
 646         &sysfs_root_usage_percent,
 647         &sysfs_btree_cache_size,
 648         &sysfs_cache_available_percent,
 649
 650         &sysfs_average_key_size,
 651
 652         &sysfs_errors,
 653         &sysfs_io_error_limit,
 654         &sysfs_io_error_halflife,
 655         &sysfs_congested,
 656         &sysfs_congested_read_threshold_us,
 657         &sysfs_congested_write_threshold_us,
 658         &sysfs_clear_stats,
 659         NULL
 660 };
 661 KTYPE(bch_cache_set);
 662
 663 static struct attribute *bch_cache_set_internal_files[] = {
 664         &sysfs_active_journal_entries,
 665
 666         sysfs_time_stats_attribute_list(btree_gc, sec, ms)
 667         sysfs_time_stats_attribute_list(btree_split, sec, us)
 668         sysfs_time_stats_attribute_list(btree_sort, ms, us)
 669         sysfs_time_stats_attribute_list(btree_read, ms, us)
 670         sysfs_time_stats_attribute_list(try_harder, ms, us)
 671
 672         &sysfs_btree_nodes,
 673         &sysfs_btree_used_percent,
 674         &sysfs_btree_cache_max_chain,
 675
 676         &sysfs_bset_tree_stats,
 677         &sysfs_cache_read_races,
 678         &sysfs_writeback_keys_done,
 679         &sysfs_writeback_keys_failed,
 680
 681         &sysfs_trigger_gc,
 682         &sysfs_prune_cache,
 683 #ifdef CONFIG_BCACHE_DEBUG
 684         &sysfs_verify,
 685         &sysfs_key_merging_disabled,
 686         &sysfs_expensive_debug_checks,
 687 #endif
 688         &sysfs_gc_always_rewrite,
 689         &sysfs_btree_shrinker_disabled,
 690         &sysfs_copy_gc_enabled,
 691         NULL
 692 };
 693 KTYPE(bch_cache_set_internal);
 694
 695 SHOW(__bch_cache)
 696 {
 697         struct cache *ca = container_of(kobj, struct cache, kobj);
 698
 699         sysfs_hprint(bucket_size,       bucket_bytes(ca));
 700         sysfs_hprint(block_size,        block_bytes(ca));
 701         sysfs_print(nbuckets,           ca->sb.nbuckets);
 702         sysfs_print(discard,            ca->discard);
 703         sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9);
 704         sysfs_hprint(btree_written,
 705                      atomic_long_read(&ca->btree_sectors_written) << 9);
 706         sysfs_hprint(metadata_written,
 707                      (atomic_long_read(&ca->meta_sectors_written) +
 708                       atomic_long_read(&ca->btree_sectors_written)) << 9);
 709
 710         sysfs_print(io_errors,
 711                     atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT);
 712
 713         if (attr == &sysfs_cache_replacement_policy)
 714                 return bch_snprint_string_list(buf, PAGE_SIZE,
 715                                                cache_replacement_policies,
 716                                                CACHE_REPLACEMENT(&ca->sb));
 717
 718         if (attr == &sysfs_priority_stats) {
 719                 int cmp(const void *l, const void *r)
 720                 {       return *((uint16_t *) r) - *((uint16_t *) l); }
 721
 722                 size_t n = ca->sb.nbuckets, i, unused, btree;
 723                 uint64_t sum = 0;
 724                 /* Compute 31 quantiles */
 725                 uint16_t q[31], *p, *cached;
 726                 ssize_t ret;
 727
 728                 cached = p = vmalloc(ca->sb.nbuckets * sizeof(uint16_t));
 729                 if (!p)
 730                         return -ENOMEM;
 731
 732                 mutex_lock(&ca->set->bucket_lock);
 733                 for (i = ca->sb.first_bucket; i < n; i++)
 734                         p[i] = ca->buckets[i].prio;
 735                 mutex_unlock(&ca->set->bucket_lock);
 736
 737                 sort(p, n, sizeof(uint16_t), cmp, NULL);
 738
 739                 while (n &&
 740                        !cached[n - 1])
 741                         --n;
 742
 743                 unused = ca->sb.nbuckets - n;
 744
 745                 while (cached < p + n &&
 746                        *cached == BTREE_PRIO)
 747                         cached++;
 748
 749                 btree = cached - p;
 750                 n -= btree;
 751
 752                 for (i = 0; i < n; i++)
 753                         sum += INITIAL_PRIO - cached[i];
 754
 755                 if (n)
 756                         do_div(sum, n);
 757
 758                 for (i = 0; i < ARRAY_SIZE(q); i++)
 759                         q[i] = INITIAL_PRIO - cached[n * (i + 1) /
 760                                 (ARRAY_SIZE(q) + 1)];
 761
 762                 vfree(p);
 763
 764                 ret = scnprintf(buf, PAGE_SIZE,
 765                                 "Unused:                %zu%%\n"
 766                                 "Metadata:      %zu%%\n"
 767                                 "Average:       %llu\n"
 768                                 "Sectors per Q: %zu\n"
 769                                 "Quantiles:     [",
 770                                 unused * 100 / (size_t) ca->sb.nbuckets,
 771                                 btree * 100 / (size_t) ca->sb.nbuckets, sum,
 772                                 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1));
 773
 774                 for (i = 0; i < ARRAY_SIZE(q); i++)
 775                         ret += scnprintf(buf + ret, PAGE_SIZE - ret,
 776                                          "%u ", q[i]);
 777                 ret--;
 778
 779                 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n");
 780
 781                 return ret;
 782         }
 783
 784         return 0;
 785 }
 786 SHOW_LOCKED(bch_cache)
 787
 788 STORE(__bch_cache)
 789 {
 790         struct cache *ca = container_of(kobj, struct cache, kobj);
 791
 792         if (attr == &sysfs_discard) {
 793                 bool v = strtoul_or_return(buf);
 794
 795                 if (blk_queue_discard(bdev_get_queue(ca->bdev)))
 796                         ca->discard = v;
 797
 798                 if (v != CACHE_DISCARD(&ca->sb)) {
 799                         SET_CACHE_DISCARD(&ca->sb, v);
 800                         bcache_write_super(ca->set);
 801                 }
 802         }
 803
 804         if (attr == &sysfs_cache_replacement_policy) {
 805                 ssize_t v = bch_read_string_list(buf, cache_replacement_policies);
 806
 807                 if (v < 0)
 808                         return v;
 809
 810                 if ((unsigned) v != CACHE_REPLACEMENT(&ca->sb)) {
 811                         mutex_lock(&ca->set->bucket_lock);
 812                         SET_CACHE_REPLACEMENT(&ca->sb, v);
 813                         mutex_unlock(&ca->set->bucket_lock);
 814
 815                         bcache_write_super(ca->set);
 816                 }
 817         }
 818
 819         if (attr == &sysfs_clear_stats) {
 820                 atomic_long_set(&ca->sectors_written, 0);
 821                 atomic_long_set(&ca->btree_sectors_written, 0);
 822                 atomic_long_set(&ca->meta_sectors_written, 0);
 823                 atomic_set(&ca->io_count, 0);
 824                 atomic_set(&ca->io_errors, 0);
 825         }
 826
 827         return size;
 828 }
 829 STORE_LOCKED(bch_cache)
 830
 831 static struct attribute *bch_cache_files[] = {
 832         &sysfs_bucket_size,
 833         &sysfs_block_size,
 834         &sysfs_nbuckets,
 835         &sysfs_priority_stats,
 836         &sysfs_discard,
 837         &sysfs_written,
 838         &sysfs_btree_written,
 839         &sysfs_metadata_written,
 840         &sysfs_io_errors,
 841         &sysfs_clear_stats,
 842         &sysfs_cache_replacement_policy,
 843         NULL
 844 };
 845 KTYPE(bch_cache);