git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/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 #ifndef NO_BCACHEFS_SYSFS
  10
  11 #include "bcachefs.h"
  12 #include "alloc_background.h"
  13 #include "sysfs.h"
  14 #include "btree_cache.h"
  15 #include "btree_io.h"
  16 #include "btree_iter.h"
  17 #include "btree_key_cache.h"
  18 #include "btree_update.h"
  19 #include "btree_update_interior.h"
  20 #include "btree_gc.h"
  21 #include "buckets.h"
  22 #include "clock.h"
  23 #include "disk_groups.h"
  24 #include "ec.h"
  25 #include "inode.h"
  26 #include "journal.h"
  27 #include "keylist.h"
  28 #include "move.h"
  29 #include "opts.h"
  30 #include "rebalance.h"
  31 #include "replicas.h"
  32 #include "super-io.h"
  33 #include "tests.h"
  34
  35 #include <linux/blkdev.h>
  36 #include <linux/sort.h>
  37 #include <linux/sched/clock.h>
  38
  39 #include "util.h"
  40
  41 #define SYSFS_OPS(type)                                                 \
  42 struct sysfs_ops type ## _sysfs_ops = {                                 \
  43         .show   = type ## _show,                                        \
  44         .store  = type ## _store                                        \
  45 }
  46
  47 #define SHOW(fn)                                                        \
  48 static ssize_t fn ## _show(struct kobject *kobj, struct attribute *attr,\
  49                            char *buf)                                   \
  50
  51 #define STORE(fn)                                                       \
  52 static ssize_t fn ## _store(struct kobject *kobj, struct attribute *attr,\
  53                             const char *buf, size_t size)               \
  54
  55 #define __sysfs_attribute(_name, _mode)                                 \
  56         static struct attribute sysfs_##_name =                         \
  57                 { .name = #_name, .mode = _mode }
  58
  59 #define write_attribute(n)      __sysfs_attribute(n, S_IWUSR)
  60 #define read_attribute(n)       __sysfs_attribute(n, S_IRUGO)
  61 #define rw_attribute(n)         __sysfs_attribute(n, S_IRUGO|S_IWUSR)
  62
  63 #define sysfs_printf(file, fmt, ...)                                    \
  64 do {                                                                    \
  65         if (attr == &sysfs_ ## file)                                    \
  66                 return scnprintf(buf, PAGE_SIZE, fmt "\n", __VA_ARGS__);\
  67 } while (0)
  68
  69 #define sysfs_print(file, var)                                          \
  70 do {                                                                    \
  71         if (attr == &sysfs_ ## file)                                    \
  72                 return snprint(buf, PAGE_SIZE, var);                    \
  73 } while (0)
  74
  75 #define sysfs_hprint(file, val)                                         \
  76 do {                                                                    \
  77         if (attr == &sysfs_ ## file) {                                  \
  78                 bch2_hprint(&out, val);                                 \
  79                 pr_buf(&out, "\n");                                     \
  80                 return out.pos - buf;                                   \
  81         }                                                               \
  82 } while (0)
  83
  84 #define var_printf(_var, fmt)   sysfs_printf(_var, fmt, var(_var))
  85 #define var_print(_var)         sysfs_print(_var, var(_var))
  86 #define var_hprint(_var)        sysfs_hprint(_var, var(_var))
  87
  88 #define sysfs_strtoul(file, var)                                        \
  89 do {                                                                    \
  90         if (attr == &sysfs_ ## file)                                    \
  91                 return strtoul_safe(buf, var) ?: (ssize_t) size;        \
  92 } while (0)
  93
  94 #define sysfs_strtoul_clamp(file, var, min, max)                        \
  95 do {                                                                    \
  96         if (attr == &sysfs_ ## file)                                    \
  97                 return strtoul_safe_clamp(buf, var, min, max)           \
  98                         ?: (ssize_t) size;                              \
  99 } while (0)
 100
 101 #define strtoul_or_return(cp)                                           \
 102 ({                                                                      \
 103         unsigned long _v;                                               \
 104         int _r = kstrtoul(cp, 10, &_v);                                 \
 105         if (_r)                                                         \
 106                 return _r;                                              \
 107         _v;                                                             \
 108 })
 109
 110 #define strtoul_restrict_or_return(cp, min, max)                        \
 111 ({                                                                      \
 112         unsigned long __v = 0;                                          \
 113         int _r = strtoul_safe_restrict(cp, __v, min, max);              \
 114         if (_r)                                                         \
 115                 return _r;                                              \
 116         __v;                                                            \
 117 })
 118
 119 #define strtoi_h_or_return(cp)                                          \
 120 ({                                                                      \
 121         u64 _v;                                                         \
 122         int _r = strtoi_h(cp, &_v);                                     \
 123         if (_r)                                                         \
 124                 return _r;                                              \
 125         _v;                                                             \
 126 })
 127
 128 #define sysfs_hatoi(file, var)                                          \
 129 do {                                                                    \
 130         if (attr == &sysfs_ ## file)                                    \
 131                 return strtoi_h(buf, &var) ?: (ssize_t) size;           \
 132 } while (0)
 133
 134 write_attribute(trigger_journal_flush);
 135 write_attribute(trigger_btree_coalesce);
 136 write_attribute(trigger_gc);
 137 write_attribute(prune_cache);
 138 rw_attribute(btree_gc_periodic);
 139
 140 read_attribute(uuid);
 141 read_attribute(minor);
 142 read_attribute(bucket_size);
 143 read_attribute(block_size);
 144 read_attribute(btree_node_size);
 145 read_attribute(first_bucket);
 146 read_attribute(nbuckets);
 147 read_attribute(durability);
 148 read_attribute(iodone);
 149
 150 read_attribute(io_latency_read);
 151 read_attribute(io_latency_write);
 152 read_attribute(io_latency_stats_read);
 153 read_attribute(io_latency_stats_write);
 154 read_attribute(congested);
 155
 156 read_attribute(bucket_quantiles_last_read);
 157 read_attribute(bucket_quantiles_last_write);
 158 read_attribute(bucket_quantiles_fragmentation);
 159 read_attribute(bucket_quantiles_oldest_gen);
 160
 161 read_attribute(reserve_stats);
 162 read_attribute(btree_cache_size);
 163 read_attribute(compression_stats);
 164 read_attribute(journal_debug);
 165 read_attribute(journal_pins);
 166 read_attribute(btree_updates);
 167 read_attribute(dirty_btree_nodes);
 168 read_attribute(btree_cache);
 169 read_attribute(btree_key_cache);
 170 read_attribute(btree_transactions);
 171 read_attribute(stripes_heap);
 172
 173 read_attribute(internal_uuid);
 174
 175 read_attribute(has_data);
 176 read_attribute(alloc_debug);
 177 write_attribute(wake_allocator);
 178
 179 read_attribute(read_realloc_races);
 180 read_attribute(extent_migrate_done);
 181 read_attribute(extent_migrate_raced);
 182
 183 rw_attribute(journal_write_delay_ms);
 184 rw_attribute(journal_reclaim_delay_ms);
 185
 186 rw_attribute(discard);
 187 rw_attribute(cache_replacement_policy);
 188 rw_attribute(label);
 189
 190 rw_attribute(copy_gc_enabled);
 191 sysfs_pd_controller_attribute(copy_gc);
 192
 193 rw_attribute(rebalance_enabled);
 194 sysfs_pd_controller_attribute(rebalance);
 195 read_attribute(rebalance_work);
 196 rw_attribute(promote_whole_extents);
 197
 198 read_attribute(new_stripes);
 199
 200 rw_attribute(pd_controllers_update_seconds);
 201
 202 read_attribute(io_timers_read);
 203 read_attribute(io_timers_write);
 204
 205 #ifdef CONFIG_BCACHEFS_TESTS
 206 write_attribute(perf_test);
 207 #endif /* CONFIG_BCACHEFS_TESTS */
 208
 209 #define x(_name)                                                \
 210         static struct attribute sysfs_time_stat_##_name =               \
 211                 { .name = #_name, .mode = S_IRUGO };
 212         BCH_TIME_STATS()
 213 #undef x
 214
 215 static struct attribute sysfs_state_rw = {
 216         .name = "state",
 217         .mode = S_IRUGO
 218 };
 219
 220 static size_t bch2_btree_cache_size(struct bch_fs *c)
 221 {
 222         size_t ret = 0;
 223         struct btree *b;
 224
 225         mutex_lock(&c->btree_cache.lock);
 226         list_for_each_entry(b, &c->btree_cache.live, list)
 227                 ret += btree_bytes(c);
 228
 229         mutex_unlock(&c->btree_cache.lock);
 230         return ret;
 231 }
 232
 233 static int fs_alloc_debug_to_text(struct printbuf *out, struct bch_fs *c)
 234 {
 235         struct bch_fs_usage *fs_usage = bch2_fs_usage_read(c);
 236
 237         if (!fs_usage)
 238                 return -ENOMEM;
 239
 240         bch2_fs_usage_to_text(out, c, fs_usage);
 241
 242         percpu_up_read(&c->mark_lock);
 243
 244         kfree(fs_usage);
 245         return 0;
 246 }
 247
 248 static int bch2_compression_stats_to_text(struct printbuf *out, struct bch_fs *c)
 249 {
 250         struct btree_trans trans;
 251         struct btree_iter *iter;
 252         struct bkey_s_c k;
 253         u64 nr_uncompressed_extents = 0, uncompressed_sectors = 0,
 254             nr_compressed_extents = 0,
 255             compressed_sectors_compressed = 0,
 256             compressed_sectors_uncompressed = 0;
 257         int ret;
 258
 259         if (!test_bit(BCH_FS_STARTED, &c->flags))
 260                 return -EPERM;
 261
 262         bch2_trans_init(&trans, c, 0, 0);
 263
 264         for_each_btree_key(&trans, iter, BTREE_ID_EXTENTS, POS_MIN, 0, k, ret)
 265                 if (k.k->type == KEY_TYPE_extent) {
 266                         struct bkey_s_c_extent e = bkey_s_c_to_extent(k);
 267                         const union bch_extent_entry *entry;
 268                         struct extent_ptr_decoded p;
 269
 270                         extent_for_each_ptr_decode(e, p, entry) {
 271                                 if (!crc_is_compressed(p.crc)) {
 272                                         nr_uncompressed_extents++;
 273                                         uncompressed_sectors += e.k->size;
 274                                 } else {
 275                                         nr_compressed_extents++;
 276                                         compressed_sectors_compressed +=
 277                                                 p.crc.compressed_size;
 278                                         compressed_sectors_uncompressed +=
 279                                                 p.crc.uncompressed_size;
 280                                 }
 281
 282                                 /* only looking at the first ptr */
 283                                 break;
 284                         }
 285                 }
 286
 287         ret = bch2_trans_exit(&trans) ?: ret;
 288         if (ret)
 289                 return ret;
 290
 291         pr_buf(out,
 292                "uncompressed data:\n"
 293                "        nr extents:                     %llu\n"
 294                "        size (bytes):                   %llu\n"
 295                "compressed data:\n"
 296                "        nr extents:                     %llu\n"
 297                "        compressed size (bytes):        %llu\n"
 298                "        uncompressed size (bytes):      %llu\n",
 299                nr_uncompressed_extents,
 300                uncompressed_sectors << 9,
 301                nr_compressed_extents,
 302                compressed_sectors_compressed << 9,
 303                compressed_sectors_uncompressed << 9);
 304         return 0;
 305 }
 306
 307 SHOW(bch2_fs)
 308 {
 309         struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);
 310         struct printbuf out = _PBUF(buf, PAGE_SIZE);
 311
 312         sysfs_print(minor,                      c->minor);
 313         sysfs_printf(internal_uuid, "%pU",      c->sb.uuid.b);
 314
 315         sysfs_print(journal_write_delay_ms,     c->journal.write_delay_ms);
 316         sysfs_print(journal_reclaim_delay_ms,   c->journal.reclaim_delay_ms);
 317
 318         sysfs_print(block_size,                 block_bytes(c));
 319         sysfs_print(btree_node_size,            btree_bytes(c));
 320         sysfs_hprint(btree_cache_size,          bch2_btree_cache_size(c));
 321
 322         sysfs_print(read_realloc_races,
 323                     atomic_long_read(&c->read_realloc_races));
 324         sysfs_print(extent_migrate_done,
 325                     atomic_long_read(&c->extent_migrate_done));
 326         sysfs_print(extent_migrate_raced,
 327                     atomic_long_read(&c->extent_migrate_raced));
 328
 329         sysfs_printf(btree_gc_periodic, "%u",   (int) c->btree_gc_periodic);
 330
 331         sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled);
 332
 333         sysfs_print(pd_controllers_update_seconds,
 334                     c->pd_controllers_update_seconds);
 335
 336         sysfs_printf(rebalance_enabled,         "%i", c->rebalance.enabled);
 337         sysfs_pd_controller_show(rebalance,     &c->rebalance.pd); /* XXX */
 338         sysfs_pd_controller_show(copy_gc,       &c->copygc_pd);
 339
 340         if (attr == &sysfs_rebalance_work) {
 341                 bch2_rebalance_work_to_text(&out, c);
 342                 return out.pos - buf;
 343         }
 344
 345         sysfs_print(promote_whole_extents,      c->promote_whole_extents);
 346
 347         /* Debugging: */
 348
 349         if (attr == &sysfs_alloc_debug)
 350                 return fs_alloc_debug_to_text(&out, c) ?: out.pos - buf;
 351
 352         if (attr == &sysfs_journal_debug) {
 353                 bch2_journal_debug_to_text(&out, &c->journal);
 354                 return out.pos - buf;
 355         }
 356
 357         if (attr == &sysfs_journal_pins) {
 358                 bch2_journal_pins_to_text(&out, &c->journal);
 359                 return out.pos - buf;
 360         }
 361
 362         if (attr == &sysfs_btree_updates) {
 363                 bch2_btree_updates_to_text(&out, c);
 364                 return out.pos - buf;
 365         }
 366
 367         if (attr == &sysfs_dirty_btree_nodes) {
 368                 bch2_dirty_btree_nodes_to_text(&out, c);
 369                 return out.pos - buf;
 370         }
 371
 372         if (attr == &sysfs_btree_cache) {
 373                 bch2_btree_cache_to_text(&out, c);
 374                 return out.pos - buf;
 375         }
 376
 377         if (attr == &sysfs_btree_key_cache) {
 378                 bch2_btree_key_cache_to_text(&out, &c->btree_key_cache);
 379                 return out.pos - buf;
 380         }
 381
 382         if (attr == &sysfs_btree_transactions) {
 383                 bch2_btree_trans_to_text(&out, c);
 384                 return out.pos - buf;
 385         }
 386
 387         if (attr == &sysfs_stripes_heap) {
 388                 bch2_stripes_heap_to_text(&out, c);
 389                 return out.pos - buf;
 390         }
 391
 392         if (attr == &sysfs_compression_stats) {
 393                 bch2_compression_stats_to_text(&out, c);
 394                 return out.pos - buf;
 395         }
 396
 397         if (attr == &sysfs_new_stripes) {
 398                 bch2_new_stripes_to_text(&out, c);
 399                 return out.pos - buf;
 400         }
 401
 402         if (attr == &sysfs_io_timers_read) {
 403                 bch2_io_timers_to_text(&out, &c->io_clock[READ]);
 404                 return out.pos - buf;
 405         }
 406         if (attr == &sysfs_io_timers_write) {
 407                 bch2_io_timers_to_text(&out, &c->io_clock[WRITE]);
 408                 return out.pos - buf;
 409         }
 410
 411         return 0;
 412 }
 413
 414 STORE(bch2_fs)
 415 {
 416         struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);
 417
 418         sysfs_strtoul(journal_write_delay_ms, c->journal.write_delay_ms);
 419         sysfs_strtoul(journal_reclaim_delay_ms, c->journal.reclaim_delay_ms);
 420
 421         if (attr == &sysfs_btree_gc_periodic) {
 422                 ssize_t ret = strtoul_safe(buf, c->btree_gc_periodic)
 423                         ?: (ssize_t) size;
 424
 425                 wake_up_process(c->gc_thread);
 426                 return ret;
 427         }
 428
 429         if (attr == &sysfs_copy_gc_enabled) {
 430                 ssize_t ret = strtoul_safe(buf, c->copy_gc_enabled)
 431                         ?: (ssize_t) size;
 432
 433                 if (c->copygc_thread)
 434                         wake_up_process(c->copygc_thread);
 435                 return ret;
 436         }
 437
 438         if (attr == &sysfs_rebalance_enabled) {
 439                 ssize_t ret = strtoul_safe(buf, c->rebalance.enabled)
 440                         ?: (ssize_t) size;
 441
 442                 rebalance_wakeup(c);
 443                 return ret;
 444         }
 445
 446         sysfs_strtoul(pd_controllers_update_seconds,
 447                       c->pd_controllers_update_seconds);
 448         sysfs_pd_controller_store(rebalance,    &c->rebalance.pd);
 449         sysfs_pd_controller_store(copy_gc,      &c->copygc_pd);
 450
 451         sysfs_strtoul(promote_whole_extents,    c->promote_whole_extents);
 452
 453         /* Debugging: */
 454
 455         if (!test_bit(BCH_FS_STARTED, &c->flags))
 456                 return -EPERM;
 457
 458         /* Debugging: */
 459
 460         if (attr == &sysfs_trigger_journal_flush)
 461                 bch2_journal_meta(&c->journal);
 462
 463         if (attr == &sysfs_trigger_btree_coalesce)
 464                 bch2_coalesce(c);
 465
 466         if (attr == &sysfs_trigger_gc) {
 467                 /*
 468                  * Full gc is currently incompatible with btree key cache:
 469                  */
 470 #if 0
 471                 down_read(&c->state_lock);
 472                 bch2_gc(c, false, false);
 473                 up_read(&c->state_lock);
 474 #else
 475                 bch2_gc_gens(c);
 476 #endif
 477         }
 478
 479         if (attr == &sysfs_prune_cache) {
 480                 struct shrink_control sc;
 481
 482                 sc.gfp_mask = GFP_KERNEL;
 483                 sc.nr_to_scan = strtoul_or_return(buf);
 484                 c->btree_cache.shrink.scan_objects(&c->btree_cache.shrink, &sc);
 485         }
 486
 487 #ifdef CONFIG_BCACHEFS_TESTS
 488         if (attr == &sysfs_perf_test) {
 489                 char *tmp = kstrdup(buf, GFP_KERNEL), *p = tmp;
 490                 char *test              = strsep(&p, " \t\n");
 491                 char *nr_str            = strsep(&p, " \t\n");
 492                 char *threads_str       = strsep(&p, " \t\n");
 493                 unsigned threads;
 494                 u64 nr;
 495                 int ret = -EINVAL;
 496
 497                 if (threads_str &&
 498                     !(ret = kstrtouint(threads_str, 10, &threads)) &&
 499                     !(ret = bch2_strtoull_h(nr_str, &nr)))
 500                         ret = bch2_btree_perf_test(c, test, nr, threads);
 501                 kfree(tmp);
 502
 503                 if (ret)
 504                         size = ret;
 505         }
 506 #endif
 507         return size;
 508 }
 509 SYSFS_OPS(bch2_fs);
 510
 511 struct attribute *bch2_fs_files[] = {
 512         &sysfs_minor,
 513         &sysfs_block_size,
 514         &sysfs_btree_node_size,
 515         &sysfs_btree_cache_size,
 516
 517         &sysfs_journal_write_delay_ms,
 518         &sysfs_journal_reclaim_delay_ms,
 519
 520         &sysfs_promote_whole_extents,
 521
 522         &sysfs_compression_stats,
 523
 524 #ifdef CONFIG_BCACHEFS_TESTS
 525         &sysfs_perf_test,
 526 #endif
 527         NULL
 528 };
 529
 530 /* internal dir - just a wrapper */
 531
 532 SHOW(bch2_fs_internal)
 533 {
 534         struct bch_fs *c = container_of(kobj, struct bch_fs, internal);
 535         return bch2_fs_show(&c->kobj, attr, buf);
 536 }
 537
 538 STORE(bch2_fs_internal)
 539 {
 540         struct bch_fs *c = container_of(kobj, struct bch_fs, internal);
 541         return bch2_fs_store(&c->kobj, attr, buf, size);
 542 }
 543 SYSFS_OPS(bch2_fs_internal);
 544
 545 struct attribute *bch2_fs_internal_files[] = {
 546         &sysfs_alloc_debug,
 547         &sysfs_journal_debug,
 548         &sysfs_journal_pins,
 549         &sysfs_btree_updates,
 550         &sysfs_dirty_btree_nodes,
 551         &sysfs_btree_cache,
 552         &sysfs_btree_key_cache,
 553         &sysfs_btree_transactions,
 554         &sysfs_stripes_heap,
 555
 556         &sysfs_read_realloc_races,
 557         &sysfs_extent_migrate_done,
 558         &sysfs_extent_migrate_raced,
 559
 560         &sysfs_trigger_journal_flush,
 561         &sysfs_trigger_btree_coalesce,
 562         &sysfs_trigger_gc,
 563         &sysfs_prune_cache,
 564
 565         &sysfs_copy_gc_enabled,
 566
 567         &sysfs_rebalance_enabled,
 568         &sysfs_rebalance_work,
 569         sysfs_pd_controller_files(rebalance),
 570         sysfs_pd_controller_files(copy_gc),
 571
 572         &sysfs_new_stripes,
 573
 574         &sysfs_io_timers_read,
 575         &sysfs_io_timers_write,
 576
 577         &sysfs_internal_uuid,
 578         NULL
 579 };
 580
 581 /* options */
 582
 583 SHOW(bch2_fs_opts_dir)
 584 {
 585         struct printbuf out = _PBUF(buf, PAGE_SIZE);
 586         struct bch_fs *c = container_of(kobj, struct bch_fs, opts_dir);
 587         const struct bch_option *opt = container_of(attr, struct bch_option, attr);
 588         int id = opt - bch2_opt_table;
 589         u64 v = bch2_opt_get_by_id(&c->opts, id);
 590
 591         bch2_opt_to_text(&out, c, opt, v, OPT_SHOW_FULL_LIST);
 592         pr_buf(&out, "\n");
 593
 594         return out.pos - buf;
 595 }
 596
 597 STORE(bch2_fs_opts_dir)
 598 {
 599         struct bch_fs *c = container_of(kobj, struct bch_fs, opts_dir);
 600         const struct bch_option *opt = container_of(attr, struct bch_option, attr);
 601         int ret, id = opt - bch2_opt_table;
 602         char *tmp;
 603         u64 v;
 604
 605         tmp = kstrdup(buf, GFP_KERNEL);
 606         if (!tmp)
 607                 return -ENOMEM;
 608
 609         ret = bch2_opt_parse(c, opt, strim(tmp), &v);
 610         kfree(tmp);
 611
 612         if (ret < 0)
 613                 return ret;
 614
 615         ret = bch2_opt_check_may_set(c, id, v);
 616         if (ret < 0)
 617                 return ret;
 618
 619         if (opt->set_sb != SET_NO_SB_OPT) {
 620                 mutex_lock(&c->sb_lock);
 621                 opt->set_sb(c->disk_sb.sb, v);
 622                 bch2_write_super(c);
 623                 mutex_unlock(&c->sb_lock);
 624         }
 625
 626         bch2_opt_set_by_id(&c->opts, id, v);
 627
 628         if ((id == Opt_background_target ||
 629              id == Opt_background_compression) && v) {
 630                 bch2_rebalance_add_work(c, S64_MAX);
 631                 rebalance_wakeup(c);
 632         }
 633
 634         return size;
 635 }
 636 SYSFS_OPS(bch2_fs_opts_dir);
 637
 638 struct attribute *bch2_fs_opts_dir_files[] = { NULL };
 639
 640 int bch2_opts_create_sysfs_files(struct kobject *kobj)
 641 {
 642         const struct bch_option *i;
 643         int ret;
 644
 645         for (i = bch2_opt_table;
 646              i < bch2_opt_table + bch2_opts_nr;
 647              i++) {
 648                 if (!(i->mode & (OPT_FORMAT|OPT_MOUNT|OPT_RUNTIME)))
 649                         continue;
 650
 651                 ret = sysfs_create_file(kobj, &i->attr);
 652                 if (ret)
 653                         return ret;
 654         }
 655
 656         return 0;
 657 }
 658
 659 /* time stats */
 660
 661 SHOW(bch2_fs_time_stats)
 662 {
 663         struct bch_fs *c = container_of(kobj, struct bch_fs, time_stats);
 664         struct printbuf out = _PBUF(buf, PAGE_SIZE);
 665
 666 #define x(name)                                                         \
 667         if (attr == &sysfs_time_stat_##name) {                          \
 668                 bch2_time_stats_to_text(&out, &c->times[BCH_TIME_##name]);\
 669                 return out.pos - buf;                                   \
 670         }
 671         BCH_TIME_STATS()
 672 #undef x
 673
 674         return 0;
 675 }
 676
 677 STORE(bch2_fs_time_stats)
 678 {
 679         return size;
 680 }
 681 SYSFS_OPS(bch2_fs_time_stats);
 682
 683 struct attribute *bch2_fs_time_stats_files[] = {
 684 #define x(name)                                         \
 685         &sysfs_time_stat_##name,
 686         BCH_TIME_STATS()
 687 #undef x
 688         NULL
 689 };
 690
 691 typedef unsigned (bucket_map_fn)(struct bch_fs *, struct bch_dev *,
 692                                  size_t, void *);
 693
 694 static unsigned bucket_last_io_fn(struct bch_fs *c, struct bch_dev *ca,
 695                                   size_t b, void *private)
 696 {
 697         int rw = (private ? 1 : 0);
 698
 699         return atomic64_read(&c->io_clock[rw].now) - bucket(ca, b)->io_time[rw];
 700 }
 701
 702 static unsigned bucket_sectors_used_fn(struct bch_fs *c, struct bch_dev *ca,
 703                                        size_t b, void *private)
 704 {
 705         struct bucket *g = bucket(ca, b);
 706         return bucket_sectors_used(g->mark);
 707 }
 708
 709 static unsigned bucket_oldest_gen_fn(struct bch_fs *c, struct bch_dev *ca,
 710                                      size_t b, void *private)
 711 {
 712         return bucket_gc_gen(bucket(ca, b));
 713 }
 714
 715 static int unsigned_cmp(const void *_l, const void *_r)
 716 {
 717         const unsigned *l = _l;
 718         const unsigned *r = _r;
 719
 720         return cmp_int(*l, *r);
 721 }
 722
 723 static int quantiles_to_text(struct printbuf *out,
 724                              struct bch_fs *c, struct bch_dev *ca,
 725                              bucket_map_fn *fn, void *private)
 726 {
 727         size_t i, n;
 728         /* Compute 31 quantiles */
 729         unsigned q[31], *p;
 730
 731         down_read(&ca->bucket_lock);
 732         n = ca->mi.nbuckets;
 733
 734         p = vzalloc(n * sizeof(unsigned));
 735         if (!p) {
 736                 up_read(&ca->bucket_lock);
 737                 return -ENOMEM;
 738         }
 739
 740         for (i = ca->mi.first_bucket; i < n; i++)
 741                 p[i] = fn(c, ca, i, private);
 742
 743         sort(p, n, sizeof(unsigned), unsigned_cmp, NULL);
 744         up_read(&ca->bucket_lock);
 745
 746         while (n &&
 747                !p[n - 1])
 748                 --n;
 749
 750         for (i = 0; i < ARRAY_SIZE(q); i++)
 751                 q[i] = p[n * (i + 1) / (ARRAY_SIZE(q) + 1)];
 752
 753         vfree(p);
 754
 755         for (i = 0; i < ARRAY_SIZE(q); i++)
 756                 pr_buf(out, "%u ", q[i]);
 757         pr_buf(out, "\n");
 758         return 0;
 759 }
 760
 761 static void reserve_stats_to_text(struct printbuf *out, struct bch_dev *ca)
 762 {
 763         enum alloc_reserve i;
 764
 765         spin_lock(&ca->fs->freelist_lock);
 766
 767         pr_buf(out, "free_inc:\t%zu\t%zu\n",
 768                fifo_used(&ca->free_inc),
 769                ca->free_inc.size);
 770
 771         for (i = 0; i < RESERVE_NR; i++)
 772                 pr_buf(out, "free[%u]:\t%zu\t%zu\n", i,
 773                        fifo_used(&ca->free[i]),
 774                        ca->free[i].size);
 775
 776         spin_unlock(&ca->fs->freelist_lock);
 777 }
 778
 779 static void dev_alloc_debug_to_text(struct printbuf *out, struct bch_dev *ca)
 780 {
 781         struct bch_fs *c = ca->fs;
 782         struct bch_dev_usage stats = bch2_dev_usage_read(ca);
 783         unsigned i, nr[BCH_DATA_NR];
 784
 785         memset(nr, 0, sizeof(nr));
 786
 787         for (i = 0; i < ARRAY_SIZE(c->open_buckets); i++)
 788                 nr[c->open_buckets[i].type]++;
 789
 790         pr_buf(out,
 791                "\t\t buckets\t sectors      fragmented\n"
 792                "capacity%16llu\n",
 793                ca->mi.nbuckets - ca->mi.first_bucket);
 794
 795         for (i = 1; i < BCH_DATA_NR; i++)
 796                 pr_buf(out, "%-8s%16llu%16llu%16llu\n",
 797                        bch2_data_types[i], stats.d[i].buckets,
 798                        stats.d[i].sectors, stats.d[i].fragmented);
 799
 800         pr_buf(out,
 801                "ec\t%16llu\n"
 802                "available%15llu\n"
 803                "alloc\t%16llu\n"
 804                "\n"
 805                "free_inc\t\t%zu/%zu\n"
 806                "free[RESERVE_MOVINGGC]\t%zu/%zu\n"
 807                "free[RESERVE_NONE]\t%zu/%zu\n"
 808                "freelist_wait\t\t%s\n"
 809                "open buckets\t\t%u/%u (reserved %u)\n"
 810                "open_buckets_wait\t%s\n"
 811                "open_buckets_btree\t%u\n"
 812                "open_buckets_user\t%u\n"
 813                "btree reserve cache\t%u\n",
 814                stats.buckets_ec,
 815                __dev_buckets_available(ca, stats),
 816                stats.buckets_alloc,
 817                fifo_used(&ca->free_inc),                ca->free_inc.size,
 818                fifo_used(&ca->free[RESERVE_MOVINGGC]),  ca->free[RESERVE_MOVINGGC].size,
 819                fifo_used(&ca->free[RESERVE_NONE]),      ca->free[RESERVE_NONE].size,
 820                c->freelist_wait.list.first              ? "waiting" : "empty",
 821                c->open_buckets_nr_free, OPEN_BUCKETS_COUNT,
 822                BTREE_NODE_OPEN_BUCKET_RESERVE,
 823                c->open_buckets_wait.list.first          ? "waiting" : "empty",
 824                nr[BCH_DATA_btree],
 825                nr[BCH_DATA_user],
 826                c->btree_reserve_cache_nr);
 827 }
 828
 829 static const char * const bch2_rw[] = {
 830         "read",
 831         "write",
 832         NULL
 833 };
 834
 835 static void dev_iodone_to_text(struct printbuf *out, struct bch_dev *ca)
 836 {
 837         int rw, i;
 838
 839         for (rw = 0; rw < 2; rw++) {
 840                 pr_buf(out, "%s:\n", bch2_rw[rw]);
 841
 842                 for (i = 1; i < BCH_DATA_NR; i++)
 843                         pr_buf(out, "%-12s:%12llu\n",
 844                                bch2_data_types[i],
 845                                percpu_u64_get(&ca->io_done->sectors[rw][i]) << 9);
 846         }
 847 }
 848
 849 SHOW(bch2_dev)
 850 {
 851         struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj);
 852         struct bch_fs *c = ca->fs;
 853         struct printbuf out = _PBUF(buf, PAGE_SIZE);
 854
 855         sysfs_printf(uuid,              "%pU\n", ca->uuid.b);
 856
 857         sysfs_print(bucket_size,        bucket_bytes(ca));
 858         sysfs_print(block_size,         block_bytes(c));
 859         sysfs_print(first_bucket,       ca->mi.first_bucket);
 860         sysfs_print(nbuckets,           ca->mi.nbuckets);
 861         sysfs_print(durability,         ca->mi.durability);
 862         sysfs_print(discard,            ca->mi.discard);
 863
 864         if (attr == &sysfs_label) {
 865                 if (ca->mi.group) {
 866                         mutex_lock(&c->sb_lock);
 867                         bch2_disk_path_to_text(&out, &c->disk_sb,
 868                                                ca->mi.group - 1);
 869                         mutex_unlock(&c->sb_lock);
 870                 }
 871
 872                 pr_buf(&out, "\n");
 873                 return out.pos - buf;
 874         }
 875
 876         if (attr == &sysfs_has_data) {
 877                 bch2_flags_to_text(&out, bch2_data_types,
 878                                    bch2_dev_has_data(c, ca));
 879                 pr_buf(&out, "\n");
 880                 return out.pos - buf;
 881         }
 882
 883         if (attr == &sysfs_cache_replacement_policy) {
 884                 bch2_string_opt_to_text(&out,
 885                                         bch2_cache_replacement_policies,
 886                                         ca->mi.replacement);
 887                 pr_buf(&out, "\n");
 888                 return out.pos - buf;
 889         }
 890
 891         if (attr == &sysfs_state_rw) {
 892                 bch2_string_opt_to_text(&out, bch2_dev_state,
 893                                         ca->mi.state);
 894                 pr_buf(&out, "\n");
 895                 return out.pos - buf;
 896         }
 897
 898         if (attr == &sysfs_iodone) {
 899                 dev_iodone_to_text(&out, ca);
 900                 return out.pos - buf;
 901         }
 902
 903         sysfs_print(io_latency_read,            atomic64_read(&ca->cur_latency[READ]));
 904         sysfs_print(io_latency_write,           atomic64_read(&ca->cur_latency[WRITE]));
 905
 906         if (attr == &sysfs_io_latency_stats_read) {
 907                 bch2_time_stats_to_text(&out, &ca->io_latency[READ]);
 908                 return out.pos - buf;
 909         }
 910         if (attr == &sysfs_io_latency_stats_write) {
 911                 bch2_time_stats_to_text(&out, &ca->io_latency[WRITE]);
 912                 return out.pos - buf;
 913         }
 914
 915         sysfs_printf(congested,                 "%u%%",
 916                      clamp(atomic_read(&ca->congested), 0, CONGESTED_MAX)
 917                      * 100 / CONGESTED_MAX);
 918
 919         if (attr == &sysfs_bucket_quantiles_last_read)
 920                 return quantiles_to_text(&out, c, ca, bucket_last_io_fn, (void *) 0) ?: out.pos - buf;
 921         if (attr == &sysfs_bucket_quantiles_last_write)
 922                 return quantiles_to_text(&out, c, ca, bucket_last_io_fn, (void *) 1) ?: out.pos - buf;
 923         if (attr == &sysfs_bucket_quantiles_fragmentation)
 924                 return quantiles_to_text(&out, c, ca, bucket_sectors_used_fn, NULL)  ?: out.pos - buf;
 925         if (attr == &sysfs_bucket_quantiles_oldest_gen)
 926                 return quantiles_to_text(&out, c, ca, bucket_oldest_gen_fn, NULL)    ?: out.pos - buf;
 927
 928         if (attr == &sysfs_reserve_stats) {
 929                 reserve_stats_to_text(&out, ca);
 930                 return out.pos - buf;
 931         }
 932         if (attr == &sysfs_alloc_debug) {
 933                 dev_alloc_debug_to_text(&out, ca);
 934                 return out.pos - buf;
 935         }
 936
 937         return 0;
 938 }
 939
 940 STORE(bch2_dev)
 941 {
 942         struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj);
 943         struct bch_fs *c = ca->fs;
 944         struct bch_member *mi;
 945
 946         if (attr == &sysfs_discard) {
 947                 bool v = strtoul_or_return(buf);
 948
 949                 mutex_lock(&c->sb_lock);
 950                 mi = &bch2_sb_get_members(c->disk_sb.sb)->members[ca->dev_idx];
 951
 952                 if (v != BCH_MEMBER_DISCARD(mi)) {
 953                         SET_BCH_MEMBER_DISCARD(mi, v);
 954                         bch2_write_super(c);
 955                 }
 956                 mutex_unlock(&c->sb_lock);
 957         }
 958
 959         if (attr == &sysfs_cache_replacement_policy) {
 960                 ssize_t v = __sysfs_match_string(bch2_cache_replacement_policies, -1, buf);
 961
 962                 if (v < 0)
 963                         return v;
 964
 965                 mutex_lock(&c->sb_lock);
 966                 mi = &bch2_sb_get_members(c->disk_sb.sb)->members[ca->dev_idx];
 967
 968                 if ((unsigned) v != BCH_MEMBER_REPLACEMENT(mi)) {
 969                         SET_BCH_MEMBER_REPLACEMENT(mi, v);
 970                         bch2_write_super(c);
 971                 }
 972                 mutex_unlock(&c->sb_lock);
 973         }
 974
 975         if (attr == &sysfs_label) {
 976                 char *tmp;
 977                 int ret;
 978
 979                 tmp = kstrdup(buf, GFP_KERNEL);
 980                 if (!tmp)
 981                         return -ENOMEM;
 982
 983                 ret = bch2_dev_group_set(c, ca, strim(tmp));
 984                 kfree(tmp);
 985                 if (ret)
 986                         return ret;
 987         }
 988
 989         if (attr == &sysfs_wake_allocator)
 990                 bch2_wake_allocator(ca);
 991
 992         return size;
 993 }
 994 SYSFS_OPS(bch2_dev);
 995
 996 struct attribute *bch2_dev_files[] = {
 997         &sysfs_uuid,
 998         &sysfs_bucket_size,
 999         &sysfs_block_size,
1000         &sysfs_first_bucket,
1001         &sysfs_nbuckets,
1002         &sysfs_durability,
1003
1004         /* settings: */
1005         &sysfs_discard,
1006         &sysfs_cache_replacement_policy,
1007         &sysfs_state_rw,
1008         &sysfs_label,
1009
1010         &sysfs_has_data,
1011         &sysfs_iodone,
1012
1013         &sysfs_io_latency_read,
1014         &sysfs_io_latency_write,
1015         &sysfs_io_latency_stats_read,
1016         &sysfs_io_latency_stats_write,
1017         &sysfs_congested,
1018
1019         /* alloc info - other stats: */
1020         &sysfs_bucket_quantiles_last_read,
1021         &sysfs_bucket_quantiles_last_write,
1022         &sysfs_bucket_quantiles_fragmentation,
1023         &sysfs_bucket_quantiles_oldest_gen,
1024
1025         &sysfs_reserve_stats,
1026
1027         /* debug: */
1028         &sysfs_alloc_debug,
1029         &sysfs_wake_allocator,
1030         NULL
1031 };
1032
1033 #endif  /* _BCACHEFS_SYSFS_H_ */