root/drivers/md/bcache/sysfs.c

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DEFINITIONS

This source file includes following definitions.
  1. bch_snprint_string_list
  2. SHOW
  3. SHOW_LOCKED
  4. STORE
  5. SHOW
  6. STORE
  7. bch_btree_bset_stats
  8. bch_bset_print_stats
  9. bch_root_usage
  10. bch_cache_size
  11. bch_cache_max_chain
  12. bch_btree_used
  13. bch_average_key_size
  14. SHOW
  15. SHOW_LOCKED
  16. STORE_LOCKED
  17. STORE
  18. bch_cache_set_internal_release
  19. __bch_cache_cmp
  20. SHOW
  21. SHOW_LOCKED

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

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