drivers/md/bcache/sysfs.c

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