git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/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 #ifndef NO_BCACHEFS_SYSFS
   9
  10 #include "bcachefs.h"
  11 #include "alloc_background.h"
  12 #include "sysfs.h"
  13 #include "btree_cache.h"
  14 #include "btree_io.h"
  15 #include "btree_iter.h"
  16 #include "btree_update.h"
  17 #include "btree_update_interior.h"
  18 #include "btree_gc.h"
  19 #include "buckets.h"
  20 #include "disk_groups.h"
  21 #include "ec.h"
  22 #include "inode.h"
  23 #include "journal.h"
  24 #include "keylist.h"
  25 #include "move.h"
  26 #include "opts.h"
  27 #include "rebalance.h"
  28 #include "replicas.h"
  29 #include "super-io.h"
  30 #include "tests.h"
  31
  32 #include <linux/blkdev.h>
  33 #include <linux/sort.h>
  34 #include <linux/sched/clock.h>
  35
  36 #include "util.h"
  37
  38 #define SYSFS_OPS(type)                                                 \
  39 struct sysfs_ops type ## _sysfs_ops = {                                 \
  40         .show   = type ## _show,                                        \
  41         .store  = type ## _store                                        \
  42 }
  43
  44 #define SHOW(fn)                                                        \
  45 static ssize_t fn ## _show(struct kobject *kobj, struct attribute *attr,\
  46                            char *buf)                                   \
  47
  48 #define STORE(fn)                                                       \
  49 static ssize_t fn ## _store(struct kobject *kobj, struct attribute *attr,\
  50                             const char *buf, size_t size)               \
  51
  52 #define __sysfs_attribute(_name, _mode)                                 \
  53         static struct attribute sysfs_##_name =                         \
  54                 { .name = #_name, .mode = _mode }
  55
  56 #define write_attribute(n)      __sysfs_attribute(n, S_IWUSR)
  57 #define read_attribute(n)       __sysfs_attribute(n, S_IRUGO)
  58 #define rw_attribute(n)         __sysfs_attribute(n, S_IRUGO|S_IWUSR)
  59
  60 #define sysfs_printf(file, fmt, ...)                                    \
  61 do {                                                                    \
  62         if (attr == &sysfs_ ## file)                                    \
  63                 return scnprintf(buf, PAGE_SIZE, fmt "\n", __VA_ARGS__);\
  64 } while (0)
  65
  66 #define sysfs_print(file, var)                                          \
  67 do {                                                                    \
  68         if (attr == &sysfs_ ## file)                                    \
  69                 return snprint(buf, PAGE_SIZE, var);                    \
  70 } while (0)
  71
  72 #define sysfs_hprint(file, val)                                         \
  73 do {                                                                    \
  74         if (attr == &sysfs_ ## file) {                                  \
  75                 ssize_t ret = bch2_hprint(buf, val);                    \
  76                 strcat(buf, "\n");                                      \
  77                 return ret + 1;                                         \
  78         }                                                               \
  79 } while (0)
  80
  81 #define var_printf(_var, fmt)   sysfs_printf(_var, fmt, var(_var))
  82 #define var_print(_var)         sysfs_print(_var, var(_var))
  83 #define var_hprint(_var)        sysfs_hprint(_var, var(_var))
  84
  85 #define sysfs_strtoul(file, var)                                        \
  86 do {                                                                    \
  87         if (attr == &sysfs_ ## file)                                    \
  88                 return strtoul_safe(buf, var) ?: (ssize_t) size;        \
  89 } while (0)
  90
  91 #define sysfs_strtoul_clamp(file, var, min, max)                        \
  92 do {                                                                    \
  93         if (attr == &sysfs_ ## file)                                    \
  94                 return strtoul_safe_clamp(buf, var, min, max)           \
  95                         ?: (ssize_t) size;                              \
  96 } while (0)
  97
  98 #define strtoul_or_return(cp)                                           \
  99 ({                                                                      \
 100         unsigned long _v;                                               \
 101         int _r = kstrtoul(cp, 10, &_v);                                 \
 102         if (_r)                                                         \
 103                 return _r;                                              \
 104         _v;                                                             \
 105 })
 106
 107 #define strtoul_restrict_or_return(cp, min, max)                        \
 108 ({                                                                      \
 109         unsigned long __v = 0;                                          \
 110         int _r = strtoul_safe_restrict(cp, __v, min, max);              \
 111         if (_r)                                                         \
 112                 return _r;                                              \
 113         __v;                                                            \
 114 })
 115
 116 #define strtoi_h_or_return(cp)                                          \
 117 ({                                                                      \
 118         u64 _v;                                                         \
 119         int _r = strtoi_h(cp, &_v);                                     \
 120         if (_r)                                                         \
 121                 return _r;                                              \
 122         _v;                                                             \
 123 })
 124
 125 #define sysfs_hatoi(file, var)                                          \
 126 do {                                                                    \
 127         if (attr == &sysfs_ ## file)                                    \
 128                 return strtoi_h(buf, &var) ?: (ssize_t) size;           \
 129 } while (0)
 130
 131 write_attribute(trigger_journal_flush);
 132 write_attribute(trigger_btree_coalesce);
 133 write_attribute(trigger_gc);
 134 write_attribute(prune_cache);
 135 rw_attribute(btree_gc_periodic);
 136
 137 read_attribute(uuid);
 138 read_attribute(minor);
 139 read_attribute(bucket_size);
 140 read_attribute(block_size);
 141 read_attribute(btree_node_size);
 142 read_attribute(first_bucket);
 143 read_attribute(nbuckets);
 144 read_attribute(durability);
 145 read_attribute(iodone);
 146
 147 read_attribute(io_latency_read);
 148 read_attribute(io_latency_write);
 149 read_attribute(io_latency_stats_read);
 150 read_attribute(io_latency_stats_write);
 151 read_attribute(congested);
 152
 153 read_attribute(bucket_quantiles_last_read);
 154 read_attribute(bucket_quantiles_last_write);
 155 read_attribute(bucket_quantiles_fragmentation);
 156 read_attribute(bucket_quantiles_oldest_gen);
 157
 158 read_attribute(reserve_stats);
 159 read_attribute(btree_cache_size);
 160 read_attribute(compression_stats);
 161 read_attribute(journal_debug);
 162 read_attribute(journal_pins);
 163 read_attribute(btree_updates);
 164 read_attribute(dirty_btree_nodes);
 165
 166 read_attribute(internal_uuid);
 167
 168 read_attribute(has_data);
 169 read_attribute(alloc_debug);
 170 write_attribute(wake_allocator);
 171
 172 read_attribute(read_realloc_races);
 173 read_attribute(extent_migrate_done);
 174 read_attribute(extent_migrate_raced);
 175
 176 rw_attribute(journal_write_delay_ms);
 177 rw_attribute(journal_reclaim_delay_ms);
 178
 179 rw_attribute(discard);
 180 rw_attribute(cache_replacement_policy);
 181 rw_attribute(label);
 182
 183 rw_attribute(copy_gc_enabled);
 184 sysfs_pd_controller_attribute(copy_gc);
 185
 186 rw_attribute(rebalance_enabled);
 187 sysfs_pd_controller_attribute(rebalance);
 188 read_attribute(rebalance_work);
 189 rw_attribute(promote_whole_extents);
 190
 191 read_attribute(new_stripes);
 192
 193 rw_attribute(pd_controllers_update_seconds);
 194
 195 read_attribute(meta_replicas_have);
 196 read_attribute(data_replicas_have);
 197
 198 #ifdef CONFIG_BCACHEFS_TESTS
 199 write_attribute(perf_test);
 200 #endif /* CONFIG_BCACHEFS_TESTS */
 201
 202 #define BCH_DEBUG_PARAM(name, description)                              \
 203         rw_attribute(name);
 204
 205         BCH_DEBUG_PARAMS()
 206 #undef BCH_DEBUG_PARAM
 207
 208 #define x(_name)                                                \
 209         static struct attribute sysfs_time_stat_##_name =               \
 210                 { .name = #_name, .mode = S_IRUGO };
 211         BCH_TIME_STATS()
 212 #undef x
 213
 214 static struct attribute sysfs_state_rw = {
 215         .name = "state",
 216         .mode = S_IRUGO
 217 };
 218
 219 static size_t bch2_btree_cache_size(struct bch_fs *c)
 220 {
 221         size_t ret = 0;
 222         struct btree *b;
 223
 224         mutex_lock(&c->btree_cache.lock);
 225         list_for_each_entry(b, &c->btree_cache.live, list)
 226                 ret += btree_bytes(c);
 227
 228         mutex_unlock(&c->btree_cache.lock);
 229         return ret;
 230 }
 231
 232 static ssize_t show_fs_alloc_debug(struct bch_fs *c, char *buf)
 233 {
 234         struct printbuf out = _PBUF(buf, PAGE_SIZE);
 235         struct bch_fs_usage stats = bch2_fs_usage_read(c);
 236         unsigned replicas, type;
 237
 238         pr_buf(&out, "capacity:\t\t%llu\n", c->capacity);
 239
 240         for (replicas = 0; replicas < ARRAY_SIZE(stats.replicas); replicas++) {
 241                 pr_buf(&out, "%u replicas:\n", replicas + 1);
 242
 243                 for (type = BCH_DATA_SB; type < BCH_DATA_NR; type++)
 244                         pr_buf(&out, "\t%s:\t\t%llu\n",
 245                                bch2_data_types[type],
 246                                stats.replicas[replicas].data[type]);
 247                 pr_buf(&out, "\terasure coded:\t%llu\n",
 248                        stats.replicas[replicas].ec_data);
 249                 pr_buf(&out, "\treserved:\t%llu\n",
 250                        stats.replicas[replicas].persistent_reserved);
 251         }
 252
 253         pr_buf(&out, "bucket usage\n");
 254
 255         for (type = BCH_DATA_SB; type < BCH_DATA_NR; type++)
 256                 pr_buf(&out, "\t%s:\t\t%llu\n",
 257                        bch2_data_types[type],
 258                        stats.buckets[type]);
 259
 260         pr_buf(&out, "online reserved:\t%llu\n",
 261                stats.online_reserved);
 262
 263         return out.pos - buf;
 264 }
 265
 266 static ssize_t bch2_compression_stats(struct bch_fs *c, char *buf)
 267 {
 268         struct btree_iter iter;
 269         struct bkey_s_c k;
 270         u64 nr_uncompressed_extents = 0, uncompressed_sectors = 0,
 271             nr_compressed_extents = 0,
 272             compressed_sectors_compressed = 0,
 273             compressed_sectors_uncompressed = 0;
 274
 275         if (!bch2_fs_running(c))
 276                 return -EPERM;
 277
 278         for_each_btree_key(&iter, c, BTREE_ID_EXTENTS, POS_MIN, 0, k)
 279                 if (k.k->type == BCH_EXTENT) {
 280                         struct bkey_s_c_extent e = bkey_s_c_to_extent(k);
 281                         const union bch_extent_entry *entry;
 282                         struct extent_ptr_decoded p;
 283
 284                         extent_for_each_ptr_decode(e, p, entry) {
 285                                 if (p.crc.compression_type == BCH_COMPRESSION_NONE) {
 286                                         nr_uncompressed_extents++;
 287                                         uncompressed_sectors += e.k->size;
 288                                 } else {
 289                                         nr_compressed_extents++;
 290                                         compressed_sectors_compressed +=
 291                                                 p.crc.compressed_size;
 292                                         compressed_sectors_uncompressed +=
 293                                                 p.crc.uncompressed_size;
 294                                 }
 295
 296                                 /* only looking at the first ptr */
 297                                 break;
 298                         }
 299                 }
 300         bch2_btree_iter_unlock(&iter);
 301
 302         return scnprintf(buf, PAGE_SIZE,
 303                         "uncompressed data:\n"
 304                         "       nr extents:                     %llu\n"
 305                         "       size (bytes):                   %llu\n"
 306                         "compressed data:\n"
 307                         "       nr extents:                     %llu\n"
 308                         "       compressed size (bytes):        %llu\n"
 309                         "       uncompressed size (bytes):      %llu\n",
 310                         nr_uncompressed_extents,
 311                         uncompressed_sectors << 9,
 312                         nr_compressed_extents,
 313                         compressed_sectors_compressed << 9,
 314                         compressed_sectors_uncompressed << 9);
 315 }
 316
 317 static ssize_t bch2_new_stripes(struct bch_fs *c, char *buf)
 318 {
 319         char *out = buf, *end = buf + PAGE_SIZE;
 320         struct ec_stripe_head *h;
 321         struct ec_stripe_new *s;
 322
 323         mutex_lock(&c->ec_new_stripe_lock);
 324         list_for_each_entry(h, &c->ec_new_stripe_list, list) {
 325                 out += scnprintf(out, end - out,
 326                                  "target %u algo %u redundancy %u:\n",
 327                                  h->target, h->algo, h->redundancy);
 328
 329                 if (h->s)
 330                         out += scnprintf(out, end - out,
 331                                          "\tpending: blocks %u allocated %u\n",
 332                                          h->s->blocks.nr,
 333                                          bitmap_weight(h->s->blocks_allocated,
 334                                                        h->s->blocks.nr));
 335
 336                 mutex_lock(&h->lock);
 337                 list_for_each_entry(s, &h->stripes, list)
 338                         out += scnprintf(out, end - out,
 339                                          "\tin flight: blocks %u allocated %u pin %u\n",
 340                                          s->blocks.nr,
 341                                          bitmap_weight(s->blocks_allocated,
 342                                                        s->blocks.nr),
 343                                          atomic_read(&s->pin));
 344                 mutex_unlock(&h->lock);
 345
 346         }
 347         mutex_unlock(&c->ec_new_stripe_lock);
 348
 349         return out - buf;
 350 }
 351
 352 SHOW(bch2_fs)
 353 {
 354         struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);
 355
 356         sysfs_print(minor,                      c->minor);
 357         sysfs_printf(internal_uuid, "%pU",      c->sb.uuid.b);
 358
 359         sysfs_print(journal_write_delay_ms,     c->journal.write_delay_ms);
 360         sysfs_print(journal_reclaim_delay_ms,   c->journal.reclaim_delay_ms);
 361
 362         sysfs_print(block_size,                 block_bytes(c));
 363         sysfs_print(btree_node_size,            btree_bytes(c));
 364         sysfs_hprint(btree_cache_size,          bch2_btree_cache_size(c));
 365
 366         sysfs_print(read_realloc_races,
 367                     atomic_long_read(&c->read_realloc_races));
 368         sysfs_print(extent_migrate_done,
 369                     atomic_long_read(&c->extent_migrate_done));
 370         sysfs_print(extent_migrate_raced,
 371                     atomic_long_read(&c->extent_migrate_raced));
 372
 373         sysfs_printf(btree_gc_periodic, "%u",   (int) c->btree_gc_periodic);
 374
 375         sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled);
 376
 377         sysfs_print(pd_controllers_update_seconds,
 378                     c->pd_controllers_update_seconds);
 379
 380         sysfs_printf(rebalance_enabled,         "%i", c->rebalance.enabled);
 381         sysfs_pd_controller_show(rebalance,     &c->rebalance.pd); /* XXX */
 382
 383         if (attr == &sysfs_rebalance_work)
 384                 return bch2_rebalance_work_show(c, buf);
 385
 386         sysfs_print(promote_whole_extents,      c->promote_whole_extents);
 387
 388         sysfs_printf(meta_replicas_have, "%i",  bch2_replicas_online(c, true));
 389         sysfs_printf(data_replicas_have, "%i",  bch2_replicas_online(c, false));
 390
 391         /* Debugging: */
 392
 393         if (attr == &sysfs_alloc_debug)
 394                 return show_fs_alloc_debug(c, buf);
 395
 396         if (attr == &sysfs_journal_debug)
 397                 return bch2_journal_print_debug(&c->journal, buf);
 398
 399         if (attr == &sysfs_journal_pins)
 400                 return bch2_journal_print_pins(&c->journal, buf);
 401
 402         if (attr == &sysfs_btree_updates)
 403                 return bch2_btree_updates_print(c, buf);
 404
 405         if (attr == &sysfs_dirty_btree_nodes)
 406                 return bch2_dirty_btree_nodes_print(c, buf);
 407
 408         if (attr == &sysfs_compression_stats)
 409                 return bch2_compression_stats(c, buf);
 410
 411         if (attr == &sysfs_new_stripes)
 412                 return bch2_new_stripes(c, buf);
 413
 414 #define BCH_DEBUG_PARAM(name, description) sysfs_print(name, c->name);
 415         BCH_DEBUG_PARAMS()
 416 #undef BCH_DEBUG_PARAM
 417
 418         return 0;
 419 }
 420
 421 STORE(__bch2_fs)
 422 {
 423         struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);
 424
 425         sysfs_strtoul(journal_write_delay_ms, c->journal.write_delay_ms);
 426         sysfs_strtoul(journal_reclaim_delay_ms, c->journal.reclaim_delay_ms);
 427
 428         if (attr == &sysfs_btree_gc_periodic) {
 429                 ssize_t ret = strtoul_safe(buf, c->btree_gc_periodic)
 430                         ?: (ssize_t) size;
 431
 432                 wake_up_process(c->gc_thread);
 433                 return ret;
 434         }
 435
 436         if (attr == &sysfs_copy_gc_enabled) {
 437                 struct bch_dev *ca;
 438                 unsigned i;
 439                 ssize_t ret = strtoul_safe(buf, c->copy_gc_enabled)
 440                         ?: (ssize_t) size;
 441
 442                 for_each_member_device(ca, c, i)
 443                         if (ca->copygc_thread)
 444                                 wake_up_process(ca->copygc_thread);
 445                 return ret;
 446         }
 447
 448         if (attr == &sysfs_rebalance_enabled) {
 449                 ssize_t ret = strtoul_safe(buf, c->rebalance.enabled)
 450                         ?: (ssize_t) size;
 451
 452                 rebalance_wakeup(c);
 453                 return ret;
 454         }
 455
 456         sysfs_strtoul(pd_controllers_update_seconds,
 457                       c->pd_controllers_update_seconds);
 458         sysfs_pd_controller_store(rebalance,    &c->rebalance.pd);
 459
 460         sysfs_strtoul(promote_whole_extents,    c->promote_whole_extents);
 461
 462         /* Debugging: */
 463
 464 #define BCH_DEBUG_PARAM(name, description) sysfs_strtoul(name, c->name);
 465         BCH_DEBUG_PARAMS()
 466 #undef BCH_DEBUG_PARAM
 467
 468         if (!bch2_fs_running(c))
 469                 return -EPERM;
 470
 471         /* Debugging: */
 472
 473         if (attr == &sysfs_trigger_journal_flush)
 474                 bch2_journal_meta_async(&c->journal, NULL);
 475
 476         if (attr == &sysfs_trigger_btree_coalesce)
 477                 bch2_coalesce(c);
 478
 479         if (attr == &sysfs_trigger_gc)
 480                 bch2_gc(c, NULL, false);
 481
 482         if (attr == &sysfs_prune_cache) {
 483                 struct shrink_control sc;
 484
 485                 sc.gfp_mask = GFP_KERNEL;
 486                 sc.nr_to_scan = strtoul_or_return(buf);
 487                 c->btree_cache.shrink.scan_objects(&c->btree_cache.shrink, &sc);
 488         }
 489 #ifdef CONFIG_BCACHEFS_TESTS
 490         if (attr == &sysfs_perf_test) {
 491                 char *tmp = kstrdup(buf, GFP_KERNEL), *p = tmp;
 492                 char *test              = strsep(&p, " \t\n");
 493                 char *nr_str            = strsep(&p, " \t\n");
 494                 char *threads_str       = strsep(&p, " \t\n");
 495                 unsigned threads;
 496                 u64 nr;
 497                 int ret = -EINVAL;
 498
 499                 if (threads_str &&
 500                     !(ret = kstrtouint(threads_str, 10, &threads)) &&
 501                     !(ret = bch2_strtoull_h(nr_str, &nr)))
 502                         bch2_btree_perf_test(c, test, nr, threads);
 503                 else
 504                         size = ret;
 505                 kfree(tmp);
 506         }
 507 #endif
 508         return size;
 509 }
 510
 511 STORE(bch2_fs)
 512 {
 513         struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);
 514
 515         mutex_lock(&c->state_lock);
 516         size = __bch2_fs_store(kobj, attr, buf, size);
 517         mutex_unlock(&c->state_lock);
 518
 519         return size;
 520 }
 521 SYSFS_OPS(bch2_fs);
 522
 523 struct attribute *bch2_fs_files[] = {
 524         &sysfs_minor,
 525         &sysfs_block_size,
 526         &sysfs_btree_node_size,
 527         &sysfs_btree_cache_size,
 528
 529         &sysfs_meta_replicas_have,
 530         &sysfs_data_replicas_have,
 531
 532         &sysfs_journal_write_delay_ms,
 533         &sysfs_journal_reclaim_delay_ms,
 534
 535         &sysfs_promote_whole_extents,
 536
 537         &sysfs_compression_stats,
 538
 539 #ifdef CONFIG_BCACHEFS_TESTS
 540         &sysfs_perf_test,
 541 #endif
 542         NULL
 543 };
 544
 545 /* internal dir - just a wrapper */
 546
 547 SHOW(bch2_fs_internal)
 548 {
 549         struct bch_fs *c = container_of(kobj, struct bch_fs, internal);
 550         return bch2_fs_show(&c->kobj, attr, buf);
 551 }
 552
 553 STORE(bch2_fs_internal)
 554 {
 555         struct bch_fs *c = container_of(kobj, struct bch_fs, internal);
 556         return bch2_fs_store(&c->kobj, attr, buf, size);
 557 }
 558 SYSFS_OPS(bch2_fs_internal);
 559
 560 struct attribute *bch2_fs_internal_files[] = {
 561         &sysfs_alloc_debug,
 562         &sysfs_journal_debug,
 563         &sysfs_journal_pins,
 564         &sysfs_btree_updates,
 565         &sysfs_dirty_btree_nodes,
 566
 567         &sysfs_read_realloc_races,
 568         &sysfs_extent_migrate_done,
 569         &sysfs_extent_migrate_raced,
 570
 571         &sysfs_trigger_journal_flush,
 572         &sysfs_trigger_btree_coalesce,
 573         &sysfs_trigger_gc,
 574         &sysfs_prune_cache,
 575
 576         &sysfs_copy_gc_enabled,
 577
 578         &sysfs_rebalance_enabled,
 579         &sysfs_rebalance_work,
 580         sysfs_pd_controller_files(rebalance),
 581
 582         &sysfs_new_stripes,
 583
 584         &sysfs_internal_uuid,
 585
 586 #define BCH_DEBUG_PARAM(name, description) &sysfs_##name,
 587         BCH_DEBUG_PARAMS()
 588 #undef BCH_DEBUG_PARAM
 589
 590         NULL
 591 };
 592
 593 /* options */
 594
 595 SHOW(bch2_fs_opts_dir)
 596 {
 597         struct printbuf out = _PBUF(buf, PAGE_SIZE);
 598         struct bch_fs *c = container_of(kobj, struct bch_fs, opts_dir);
 599         const struct bch_option *opt = container_of(attr, struct bch_option, attr);
 600         int id = opt - bch2_opt_table;
 601         u64 v = bch2_opt_get_by_id(&c->opts, id);
 602
 603         bch2_opt_to_text(&out, c, opt, v, OPT_SHOW_FULL_LIST);
 604         pr_buf(&out, "\n");
 605
 606         return out.pos - buf;
 607 }
 608
 609 STORE(bch2_fs_opts_dir)
 610 {
 611         struct bch_fs *c = container_of(kobj, struct bch_fs, opts_dir);
 612         const struct bch_option *opt = container_of(attr, struct bch_option, attr);
 613         int ret, id = opt - bch2_opt_table;
 614         char *tmp;
 615         u64 v;
 616
 617         tmp = kstrdup(buf, GFP_KERNEL);
 618         if (!tmp)
 619                 return -ENOMEM;
 620
 621         ret = bch2_opt_parse(c, opt, strim(tmp), &v);
 622         kfree(tmp);
 623
 624         if (ret < 0)
 625                 return ret;
 626
 627         ret = bch2_opt_check_may_set(c, id, v);
 628         if (ret < 0)
 629                 return ret;
 630
 631         if (opt->set_sb != SET_NO_SB_OPT) {
 632                 mutex_lock(&c->sb_lock);
 633                 opt->set_sb(c->disk_sb.sb, v);
 634                 bch2_write_super(c);
 635                 mutex_unlock(&c->sb_lock);
 636         }
 637
 638         bch2_opt_set_by_id(&c->opts, id, v);
 639
 640         if ((id == Opt_background_target ||
 641              id == Opt_background_compression) && v) {
 642                 bch2_rebalance_add_work(c, S64_MAX);
 643                 rebalance_wakeup(c);
 644         }
 645
 646         return size;
 647 }
 648 SYSFS_OPS(bch2_fs_opts_dir);
 649
 650 struct attribute *bch2_fs_opts_dir_files[] = { NULL };
 651
 652 int bch2_opts_create_sysfs_files(struct kobject *kobj)
 653 {
 654         const struct bch_option *i;
 655         int ret;
 656
 657         for (i = bch2_opt_table;
 658              i < bch2_opt_table + bch2_opts_nr;
 659              i++) {
 660                 if (i->mode == OPT_INTERNAL)
 661                         continue;
 662
 663                 ret = sysfs_create_file(kobj, &i->attr);
 664                 if (ret)
 665                         return ret;
 666         }
 667
 668         return 0;
 669 }
 670
 671 /* time stats */
 672
 673 SHOW(bch2_fs_time_stats)
 674 {
 675         struct bch_fs *c = container_of(kobj, struct bch_fs, time_stats);
 676
 677 #define x(name)                                         \
 678         if (attr == &sysfs_time_stat_##name)                            \
 679                 return bch2_time_stats_print(&c->times[BCH_TIME_##name],\
 680                                              buf, PAGE_SIZE);
 681         BCH_TIME_STATS()
 682 #undef x
 683
 684         return 0;
 685 }
 686
 687 STORE(bch2_fs_time_stats)
 688 {
 689         return size;
 690 }
 691 SYSFS_OPS(bch2_fs_time_stats);
 692
 693 struct attribute *bch2_fs_time_stats_files[] = {
 694 #define x(name)                                         \
 695         &sysfs_time_stat_##name,
 696         BCH_TIME_STATS()
 697 #undef x
 698         NULL
 699 };
 700
 701 typedef unsigned (bucket_map_fn)(struct bch_fs *, struct bch_dev *,
 702                                  size_t, void *);
 703
 704 static unsigned bucket_last_io_fn(struct bch_fs *c, struct bch_dev *ca,
 705                                   size_t b, void *private)
 706 {
 707         int rw = (private ? 1 : 0);
 708
 709         return bucket_last_io(c, bucket(ca, b), rw);
 710 }
 711
 712 static unsigned bucket_sectors_used_fn(struct bch_fs *c, struct bch_dev *ca,
 713                                        size_t b, void *private)
 714 {
 715         struct bucket *g = bucket(ca, b);
 716         return bucket_sectors_used(g->mark);
 717 }
 718
 719 static unsigned bucket_oldest_gen_fn(struct bch_fs *c, struct bch_dev *ca,
 720                                      size_t b, void *private)
 721 {
 722         return bucket_gc_gen(ca, b);
 723 }
 724
 725 static int unsigned_cmp(const void *_l, const void *_r)
 726 {
 727         unsigned l = *((unsigned *) _l);
 728         unsigned r = *((unsigned *) _r);
 729
 730         return (l > r) - (l < r);
 731 }
 732
 733 static ssize_t show_quantiles(struct bch_fs *c, struct bch_dev *ca,
 734                               char *buf, bucket_map_fn *fn, void *private)
 735 {
 736         size_t i, n;
 737         /* Compute 31 quantiles */
 738         unsigned q[31], *p;
 739         ssize_t ret = 0;
 740
 741         down_read(&ca->bucket_lock);
 742         n = ca->mi.nbuckets;
 743
 744         p = vzalloc(n * sizeof(unsigned));
 745         if (!p) {
 746                 up_read(&ca->bucket_lock);
 747                 return -ENOMEM;
 748         }
 749
 750         for (i = ca->mi.first_bucket; i < n; i++)
 751                 p[i] = fn(c, ca, i, private);
 752
 753         sort(p, n, sizeof(unsigned), unsigned_cmp, NULL);
 754         up_read(&ca->bucket_lock);
 755
 756         while (n &&
 757                !p[n - 1])
 758                 --n;
 759
 760         for (i = 0; i < ARRAY_SIZE(q); i++)
 761                 q[i] = p[n * (i + 1) / (ARRAY_SIZE(q) + 1)];
 762
 763         vfree(p);
 764
 765         for (i = 0; i < ARRAY_SIZE(q); i++)
 766                 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
 767                                  "%u ", q[i]);
 768         buf[ret - 1] = '\n';
 769
 770         return ret;
 771 }
 772
 773 static ssize_t show_reserve_stats(struct bch_dev *ca, char *buf)
 774 {
 775         struct printbuf out = _PBUF(buf, PAGE_SIZE);
 776         enum alloc_reserve i;
 777
 778         spin_lock(&ca->freelist_lock);
 779
 780         pr_buf(&out, "free_inc:\t%zu\t%zu\n",
 781                fifo_used(&ca->free_inc),
 782                ca->free_inc.size);
 783
 784         for (i = 0; i < RESERVE_NR; i++)
 785                 pr_buf(&out, "free[%u]:\t%zu\t%zu\n", i,
 786                        fifo_used(&ca->free[i]),
 787                        ca->free[i].size);
 788
 789         spin_unlock(&ca->freelist_lock);
 790
 791         return out.pos - buf;
 792 }
 793
 794 static ssize_t show_dev_alloc_debug(struct bch_dev *ca, char *buf)
 795 {
 796         struct bch_fs *c = ca->fs;
 797         struct bch_dev_usage stats = bch2_dev_usage_read(c, ca);
 798
 799         return scnprintf(buf, PAGE_SIZE,
 800                 "free_inc:               %zu/%zu\n"
 801                 "free[RESERVE_BTREE]:    %zu/%zu\n"
 802                 "free[RESERVE_MOVINGGC]: %zu/%zu\n"
 803                 "free[RESERVE_NONE]:     %zu/%zu\n"
 804                 "buckets:\n"
 805                 "    capacity:           %llu\n"
 806                 "    alloc:              %llu\n"
 807                 "    sb:                 %llu\n"
 808                 "    journal:            %llu\n"
 809                 "    meta:               %llu\n"
 810                 "    user:               %llu\n"
 811                 "    cached:             %llu\n"
 812                 "    erasure coded:      %llu\n"
 813                 "    available:          %lli\n"
 814                 "sectors:\n"
 815                 "    sb:                 %llu\n"
 816                 "    journal:            %llu\n"
 817                 "    meta:               %llu\n"
 818                 "    user:               %llu\n"
 819                 "    cached:             %llu\n"
 820                 "    fragmented:         %llu\n"
 821                 "    copygc threshold:   %llu\n"
 822                 "freelist_wait:          %s\n"
 823                 "open buckets:           %u/%u (reserved %u)\n"
 824                 "open_buckets_wait:      %s\n",
 825                 fifo_used(&ca->free_inc),               ca->free_inc.size,
 826                 fifo_used(&ca->free[RESERVE_BTREE]),    ca->free[RESERVE_BTREE].size,
 827                 fifo_used(&ca->free[RESERVE_MOVINGGC]), ca->free[RESERVE_MOVINGGC].size,
 828                 fifo_used(&ca->free[RESERVE_NONE]),     ca->free[RESERVE_NONE].size,
 829                 ca->mi.nbuckets - ca->mi.first_bucket,
 830                 stats.buckets_alloc,
 831                 stats.buckets[BCH_DATA_SB],
 832                 stats.buckets[BCH_DATA_JOURNAL],
 833                 stats.buckets[BCH_DATA_BTREE],
 834                 stats.buckets[BCH_DATA_USER],
 835                 stats.buckets[BCH_DATA_CACHED],
 836                 stats.buckets_ec,
 837                 ca->mi.nbuckets - ca->mi.first_bucket - stats.buckets_unavailable,
 838                 stats.sectors[BCH_DATA_SB],
 839                 stats.sectors[BCH_DATA_JOURNAL],
 840                 stats.sectors[BCH_DATA_BTREE],
 841                 stats.sectors[BCH_DATA_USER],
 842                 stats.sectors[BCH_DATA_CACHED],
 843                 stats.sectors_fragmented,
 844                 ca->copygc_threshold,
 845                 c->freelist_wait.list.first             ? "waiting" : "empty",
 846                 c->open_buckets_nr_free, OPEN_BUCKETS_COUNT, BTREE_NODE_RESERVE,
 847                 c->open_buckets_wait.list.first         ? "waiting" : "empty");
 848 }
 849
 850 static const char * const bch2_rw[] = {
 851         "read",
 852         "write",
 853         NULL
 854 };
 855
 856 static ssize_t show_dev_iodone(struct bch_dev *ca, char *buf)
 857 {
 858         struct printbuf out = _PBUF(buf, PAGE_SIZE);
 859         int rw, i, cpu;
 860
 861         for (rw = 0; rw < 2; rw++) {
 862                 pr_buf(&out, "%s:\n", bch2_rw[rw]);
 863
 864                 for (i = 1; i < BCH_DATA_NR; i++) {
 865                         u64 n = 0;
 866
 867                         for_each_possible_cpu(cpu)
 868                                 n += per_cpu_ptr(ca->io_done, cpu)->sectors[rw][i];
 869
 870                         pr_buf(&out, "%-12s:%12llu\n",
 871                                bch2_data_types[i], n << 9);
 872                 }
 873         }
 874
 875         return out.pos - buf;
 876 }
 877
 878 SHOW(bch2_dev)
 879 {
 880         struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj);
 881         struct bch_fs *c = ca->fs;
 882         struct printbuf out = _PBUF(buf, PAGE_SIZE);
 883
 884         sysfs_printf(uuid,              "%pU\n", ca->uuid.b);
 885
 886         sysfs_print(bucket_size,        bucket_bytes(ca));
 887         sysfs_print(block_size,         block_bytes(c));
 888         sysfs_print(first_bucket,       ca->mi.first_bucket);
 889         sysfs_print(nbuckets,           ca->mi.nbuckets);
 890         sysfs_print(durability,         ca->mi.durability);
 891         sysfs_print(discard,            ca->mi.discard);
 892
 893         if (attr == &sysfs_label) {
 894                 if (ca->mi.group) {
 895                         mutex_lock(&c->sb_lock);
 896                         bch2_disk_path_to_text(&out, &c->disk_sb,
 897                                                ca->mi.group - 1);
 898                         mutex_unlock(&c->sb_lock);
 899                 } else {
 900                         pr_buf(&out, "none");
 901                 }
 902
 903                 pr_buf(&out, "\n");
 904                 return out.pos - buf;
 905         }
 906
 907         if (attr == &sysfs_has_data) {
 908                 bch2_flags_to_text(&out, bch2_data_types,
 909                                    bch2_dev_has_data(c, ca));
 910                 pr_buf(&out, "\n");
 911                 return out.pos - buf;
 912         }
 913
 914         sysfs_pd_controller_show(copy_gc, &ca->copygc_pd);
 915
 916         if (attr == &sysfs_cache_replacement_policy) {
 917                 bch2_string_opt_to_text(&out,
 918                                         bch2_cache_replacement_policies,
 919                                         ca->mi.replacement);
 920                 pr_buf(&out, "\n");
 921                 return out.pos - buf;
 922         }
 923
 924         if (attr == &sysfs_state_rw) {
 925                 bch2_string_opt_to_text(&out, bch2_dev_state,
 926                                         ca->mi.state);
 927                 pr_buf(&out, "\n");
 928                 return out.pos - buf;
 929         }
 930
 931         if (attr == &sysfs_iodone)
 932                 return show_dev_iodone(ca, buf);
 933
 934         sysfs_print(io_latency_read,            atomic64_read(&ca->cur_latency[READ]));
 935         sysfs_print(io_latency_write,           atomic64_read(&ca->cur_latency[WRITE]));
 936
 937         if (attr == &sysfs_io_latency_stats_read)
 938                 return bch2_time_stats_print(&ca->io_latency[READ], buf, PAGE_SIZE);
 939         if (attr == &sysfs_io_latency_stats_write)
 940                 return bch2_time_stats_print(&ca->io_latency[WRITE], buf, PAGE_SIZE);
 941
 942         sysfs_printf(congested,                 "%u%%",
 943                      clamp(atomic_read(&ca->congested), 0, CONGESTED_MAX)
 944                      * 100 / CONGESTED_MAX);
 945
 946         if (attr == &sysfs_bucket_quantiles_last_read)
 947                 return show_quantiles(c, ca, buf, bucket_last_io_fn, (void *) 0);
 948         if (attr == &sysfs_bucket_quantiles_last_write)
 949                 return show_quantiles(c, ca, buf, bucket_last_io_fn, (void *) 1);
 950         if (attr == &sysfs_bucket_quantiles_fragmentation)
 951                 return show_quantiles(c, ca, buf, bucket_sectors_used_fn, NULL);
 952         if (attr == &sysfs_bucket_quantiles_oldest_gen)
 953                 return show_quantiles(c, ca, buf, bucket_oldest_gen_fn, NULL);
 954
 955         if (attr == &sysfs_reserve_stats)
 956                 return show_reserve_stats(ca, buf);
 957         if (attr == &sysfs_alloc_debug)
 958                 return show_dev_alloc_debug(ca, buf);
 959
 960         return 0;
 961 }
 962
 963 STORE(bch2_dev)
 964 {
 965         struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj);
 966         struct bch_fs *c = ca->fs;
 967         struct bch_member *mi;
 968
 969         sysfs_pd_controller_store(copy_gc, &ca->copygc_pd);
 970
 971         if (attr == &sysfs_discard) {
 972                 bool v = strtoul_or_return(buf);
 973
 974                 mutex_lock(&c->sb_lock);
 975                 mi = &bch2_sb_get_members(c->disk_sb.sb)->members[ca->dev_idx];
 976
 977                 if (v != BCH_MEMBER_DISCARD(mi)) {
 978                         SET_BCH_MEMBER_DISCARD(mi, v);
 979                         bch2_write_super(c);
 980                 }
 981                 mutex_unlock(&c->sb_lock);
 982         }
 983
 984         if (attr == &sysfs_cache_replacement_policy) {
 985                 ssize_t v = __sysfs_match_string(bch2_cache_replacement_policies, -1, buf);
 986
 987                 if (v < 0)
 988                         return v;
 989
 990                 mutex_lock(&c->sb_lock);
 991                 mi = &bch2_sb_get_members(c->disk_sb.sb)->members[ca->dev_idx];
 992
 993                 if ((unsigned) v != BCH_MEMBER_REPLACEMENT(mi)) {
 994                         SET_BCH_MEMBER_REPLACEMENT(mi, v);
 995                         bch2_write_super(c);
 996                 }
 997                 mutex_unlock(&c->sb_lock);
 998         }
 999
1000         if (attr == &sysfs_label) {
1001                 char *tmp;
1002                 int ret;
1003
1004                 tmp = kstrdup(buf, GFP_KERNEL);
1005                 if (!tmp)
1006                         return -ENOMEM;
1007
1008                 ret = bch2_dev_group_set(c, ca, strim(tmp));
1009                 kfree(tmp);
1010                 if (ret)
1011                         return ret;
1012         }
1013
1014         if (attr == &sysfs_wake_allocator)
1015                 bch2_wake_allocator(ca);
1016
1017         return size;
1018 }
1019 SYSFS_OPS(bch2_dev);
1020
1021 struct attribute *bch2_dev_files[] = {
1022         &sysfs_uuid,
1023         &sysfs_bucket_size,
1024         &sysfs_block_size,
1025         &sysfs_first_bucket,
1026         &sysfs_nbuckets,
1027         &sysfs_durability,
1028
1029         /* settings: */
1030         &sysfs_discard,
1031         &sysfs_cache_replacement_policy,
1032         &sysfs_state_rw,
1033         &sysfs_label,
1034
1035         &sysfs_has_data,
1036         &sysfs_iodone,
1037
1038         &sysfs_io_latency_read,
1039         &sysfs_io_latency_write,
1040         &sysfs_io_latency_stats_read,
1041         &sysfs_io_latency_stats_write,
1042         &sysfs_congested,
1043
1044         /* alloc info - other stats: */
1045         &sysfs_bucket_quantiles_last_read,
1046         &sysfs_bucket_quantiles_last_write,
1047         &sysfs_bucket_quantiles_fragmentation,
1048         &sysfs_bucket_quantiles_oldest_gen,
1049
1050         &sysfs_reserve_stats,
1051
1052         /* debug: */
1053         &sysfs_alloc_debug,
1054         &sysfs_wake_allocator,
1055
1056         sysfs_pd_controller_files(copy_gc),
1057         NULL
1058 };
1059
1060 #endif  /* _BCACHEFS_SYSFS_H_ */