git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/alloc_background.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "bcachefs.h"
   3 #include "alloc_background.h"
   4 #include "alloc_foreground.h"
   5 #include "backpointers.h"
   6 #include "btree_cache.h"
   7 #include "btree_io.h"
   8 #include "btree_key_cache.h"
   9 #include "btree_update.h"
  10 #include "btree_update_interior.h"
  11 #include "btree_gc.h"
  12 #include "buckets.h"
  13 #include "buckets_waiting_for_journal.h"
  14 #include "clock.h"
  15 #include "debug.h"
  16 #include "ec.h"
  17 #include "error.h"
  18 #include "lru.h"
  19 #include "recovery.h"
  20 #include "varint.h"
  21
  22 #include <linux/kthread.h>
  23 #include <linux/math64.h>
  24 #include <linux/random.h>
  25 #include <linux/rculist.h>
  26 #include <linux/rcupdate.h>
  27 #include <linux/sched/task.h>
  28 #include <linux/sort.h>
  29 #include <trace/events/bcachefs.h>
  30
  31 /* Persistent alloc info: */
  32
  33 static const unsigned BCH_ALLOC_V1_FIELD_BYTES[] = {
  34 #define x(name, bits) [BCH_ALLOC_FIELD_V1_##name] = bits / 8,
  35         BCH_ALLOC_FIELDS_V1()
  36 #undef x
  37 };
  38
  39 struct bkey_alloc_unpacked {
  40         u64             journal_seq;
  41         u8              gen;
  42         u8              oldest_gen;
  43         u8              data_type;
  44         bool            need_discard:1;
  45         bool            need_inc_gen:1;
  46 #define x(_name, _bits) u##_bits _name;
  47         BCH_ALLOC_FIELDS_V2()
  48 #undef  x
  49 };
  50
  51 static inline u64 alloc_field_v1_get(const struct bch_alloc *a,
  52                                      const void **p, unsigned field)
  53 {
  54         unsigned bytes = BCH_ALLOC_V1_FIELD_BYTES[field];
  55         u64 v;
  56
  57         if (!(a->fields & (1 << field)))
  58                 return 0;
  59
  60         switch (bytes) {
  61         case 1:
  62                 v = *((const u8 *) *p);
  63                 break;
  64         case 2:
  65                 v = le16_to_cpup(*p);
  66                 break;
  67         case 4:
  68                 v = le32_to_cpup(*p);
  69                 break;
  70         case 8:
  71                 v = le64_to_cpup(*p);
  72                 break;
  73         default:
  74                 BUG();
  75         }
  76
  77         *p += bytes;
  78         return v;
  79 }
  80
  81 static inline void alloc_field_v1_put(struct bkey_i_alloc *a, void **p,
  82                                       unsigned field, u64 v)
  83 {
  84         unsigned bytes = BCH_ALLOC_V1_FIELD_BYTES[field];
  85
  86         if (!v)
  87                 return;
  88
  89         a->v.fields |= 1 << field;
  90
  91         switch (bytes) {
  92         case 1:
  93                 *((u8 *) *p) = v;
  94                 break;
  95         case 2:
  96                 *((__le16 *) *p) = cpu_to_le16(v);
  97                 break;
  98         case 4:
  99                 *((__le32 *) *p) = cpu_to_le32(v);
 100                 break;
 101         case 8:
 102                 *((__le64 *) *p) = cpu_to_le64(v);
 103                 break;
 104         default:
 105                 BUG();
 106         }
 107
 108         *p += bytes;
 109 }
 110
 111 static void bch2_alloc_unpack_v1(struct bkey_alloc_unpacked *out,
 112                                  struct bkey_s_c k)
 113 {
 114         const struct bch_alloc *in = bkey_s_c_to_alloc(k).v;
 115         const void *d = in->data;
 116         unsigned idx = 0;
 117
 118         out->gen = in->gen;
 119
 120 #define x(_name, _bits) out->_name = alloc_field_v1_get(in, &d, idx++);
 121         BCH_ALLOC_FIELDS_V1()
 122 #undef  x
 123 }
 124
 125 static int bch2_alloc_unpack_v2(struct bkey_alloc_unpacked *out,
 126                                 struct bkey_s_c k)
 127 {
 128         struct bkey_s_c_alloc_v2 a = bkey_s_c_to_alloc_v2(k);
 129         const u8 *in = a.v->data;
 130         const u8 *end = bkey_val_end(a);
 131         unsigned fieldnr = 0;
 132         int ret;
 133         u64 v;
 134
 135         out->gen        = a.v->gen;
 136         out->oldest_gen = a.v->oldest_gen;
 137         out->data_type  = a.v->data_type;
 138
 139 #define x(_name, _bits)                                                 \
 140         if (fieldnr < a.v->nr_fields) {                                 \
 141                 ret = bch2_varint_decode_fast(in, end, &v);             \
 142                 if (ret < 0)                                            \
 143                         return ret;                                     \
 144                 in += ret;                                              \
 145         } else {                                                        \
 146                 v = 0;                                                  \
 147         }                                                               \
 148         out->_name = v;                                                 \
 149         if (v != out->_name)                                            \
 150                 return -1;                                              \
 151         fieldnr++;
 152
 153         BCH_ALLOC_FIELDS_V2()
 154 #undef  x
 155         return 0;
 156 }
 157
 158 static int bch2_alloc_unpack_v3(struct bkey_alloc_unpacked *out,
 159                                 struct bkey_s_c k)
 160 {
 161         struct bkey_s_c_alloc_v3 a = bkey_s_c_to_alloc_v3(k);
 162         const u8 *in = a.v->data;
 163         const u8 *end = bkey_val_end(a);
 164         unsigned fieldnr = 0;
 165         int ret;
 166         u64 v;
 167
 168         out->gen        = a.v->gen;
 169         out->oldest_gen = a.v->oldest_gen;
 170         out->data_type  = a.v->data_type;
 171         out->need_discard = BCH_ALLOC_V3_NEED_DISCARD(a.v);
 172         out->need_inc_gen = BCH_ALLOC_V3_NEED_INC_GEN(a.v);
 173         out->journal_seq = le64_to_cpu(a.v->journal_seq);
 174
 175 #define x(_name, _bits)                                                 \
 176         if (fieldnr < a.v->nr_fields) {                                 \
 177                 ret = bch2_varint_decode_fast(in, end, &v);             \
 178                 if (ret < 0)                                            \
 179                         return ret;                                     \
 180                 in += ret;                                              \
 181         } else {                                                        \
 182                 v = 0;                                                  \
 183         }                                                               \
 184         out->_name = v;                                                 \
 185         if (v != out->_name)                                            \
 186                 return -1;                                              \
 187         fieldnr++;
 188
 189         BCH_ALLOC_FIELDS_V2()
 190 #undef  x
 191         return 0;
 192 }
 193
 194 static struct bkey_alloc_unpacked bch2_alloc_unpack(struct bkey_s_c k)
 195 {
 196         struct bkey_alloc_unpacked ret = { .gen = 0 };
 197
 198         switch (k.k->type) {
 199         case KEY_TYPE_alloc:
 200                 bch2_alloc_unpack_v1(&ret, k);
 201                 break;
 202         case KEY_TYPE_alloc_v2:
 203                 bch2_alloc_unpack_v2(&ret, k);
 204                 break;
 205         case KEY_TYPE_alloc_v3:
 206                 bch2_alloc_unpack_v3(&ret, k);
 207                 break;
 208         }
 209
 210         return ret;
 211 }
 212
 213 struct bkey_i_alloc_v4 *
 214 bch2_trans_start_alloc_update(struct btree_trans *trans, struct btree_iter *iter,
 215                               struct bpos pos)
 216 {
 217         struct bkey_s_c k;
 218         struct bkey_i_alloc_v4 *a;
 219         int ret;
 220
 221         bch2_trans_iter_init(trans, iter, BTREE_ID_alloc, pos,
 222                              BTREE_ITER_WITH_UPDATES|
 223                              BTREE_ITER_CACHED|
 224                              BTREE_ITER_INTENT);
 225         k = bch2_btree_iter_peek_slot(iter);
 226         ret = bkey_err(k);
 227         if (ret) {
 228                 bch2_trans_iter_exit(trans, iter);
 229                 return ERR_PTR(ret);
 230         }
 231
 232         a = bch2_alloc_to_v4_mut(trans, k);
 233         if (IS_ERR(a))
 234                 bch2_trans_iter_exit(trans, iter);
 235         return a;
 236 }
 237
 238 static unsigned bch_alloc_v1_val_u64s(const struct bch_alloc *a)
 239 {
 240         unsigned i, bytes = offsetof(struct bch_alloc, data);
 241
 242         for (i = 0; i < ARRAY_SIZE(BCH_ALLOC_V1_FIELD_BYTES); i++)
 243                 if (a->fields & (1 << i))
 244                         bytes += BCH_ALLOC_V1_FIELD_BYTES[i];
 245
 246         return DIV_ROUND_UP(bytes, sizeof(u64));
 247 }
 248
 249 int bch2_alloc_v1_invalid(const struct bch_fs *c, struct bkey_s_c k,
 250                           int rw, struct printbuf *err)
 251 {
 252         struct bkey_s_c_alloc a = bkey_s_c_to_alloc(k);
 253
 254         /* allow for unknown fields */
 255         if (bkey_val_u64s(a.k) < bch_alloc_v1_val_u64s(a.v)) {
 256                 prt_printf(err, "incorrect value size (%zu < %u)",
 257                        bkey_val_u64s(a.k), bch_alloc_v1_val_u64s(a.v));
 258                 return -EINVAL;
 259         }
 260
 261         return 0;
 262 }
 263
 264 int bch2_alloc_v2_invalid(const struct bch_fs *c, struct bkey_s_c k,
 265                           int rw, struct printbuf *err)
 266 {
 267         struct bkey_alloc_unpacked u;
 268
 269         if (bch2_alloc_unpack_v2(&u, k)) {
 270                 prt_printf(err, "unpack error");
 271                 return -EINVAL;
 272         }
 273
 274         return 0;
 275 }
 276
 277 int bch2_alloc_v3_invalid(const struct bch_fs *c, struct bkey_s_c k,
 278                           int rw, struct printbuf *err)
 279 {
 280         struct bkey_alloc_unpacked u;
 281
 282         if (bch2_alloc_unpack_v3(&u, k)) {
 283                 prt_printf(err, "unpack error");
 284                 return -EINVAL;
 285         }
 286
 287         return 0;
 288 }
 289
 290 int bch2_alloc_v4_invalid(const struct bch_fs *c, struct bkey_s_c k,
 291                           int rw, struct printbuf *err)
 292 {
 293         struct bkey_s_c_alloc_v4 a = bkey_s_c_to_alloc_v4(k);
 294
 295         if (alloc_v4_u64s(a.v) != bkey_val_u64s(k.k)) {
 296                 prt_printf(err, "bad val size (%lu != %u)",
 297                        bkey_val_u64s(k.k), alloc_v4_u64s(a.v));
 298                 return -EINVAL;
 299         }
 300
 301         if (!BCH_ALLOC_V4_BACKPOINTERS_START(a.v) &&
 302             BCH_ALLOC_V4_NR_BACKPOINTERS(a.v)) {
 303                 prt_printf(err, "invalid backpointers_start");
 304                 return -EINVAL;
 305         }
 306
 307         if (rw == WRITE) {
 308                 if (alloc_data_type(*a.v, a.v->data_type) != a.v->data_type) {
 309                         prt_printf(err, "invalid data type (got %u should be %u)",
 310                                a.v->data_type, alloc_data_type(*a.v, a.v->data_type));
 311                         return -EINVAL;
 312                 }
 313
 314                 switch (a.v->data_type) {
 315                 case BCH_DATA_free:
 316                 case BCH_DATA_need_gc_gens:
 317                 case BCH_DATA_need_discard:
 318                         if (a.v->dirty_sectors ||
 319                             a.v->cached_sectors ||
 320                             a.v->stripe) {
 321                                 prt_printf(err, "empty data type free but have data");
 322                                 return -EINVAL;
 323                         }
 324                         break;
 325                 case BCH_DATA_sb:
 326                 case BCH_DATA_journal:
 327                 case BCH_DATA_btree:
 328                 case BCH_DATA_user:
 329                 case BCH_DATA_parity:
 330                         if (!a.v->dirty_sectors) {
 331                                 prt_printf(err, "data_type %s but dirty_sectors==0",
 332                                        bch2_data_types[a.v->data_type]);
 333                                 return -EINVAL;
 334                         }
 335                         break;
 336                 case BCH_DATA_cached:
 337                         if (!a.v->cached_sectors ||
 338                             a.v->dirty_sectors ||
 339                             a.v->stripe) {
 340                                 prt_printf(err, "data type inconsistency");
 341                                 return -EINVAL;
 342                         }
 343
 344                         if (!a.v->io_time[READ] &&
 345                             test_bit(BCH_FS_CHECK_ALLOC_TO_LRU_REFS_DONE, &c->flags)) {
 346                                 prt_printf(err, "cached bucket with read_time == 0");
 347                                 return -EINVAL;
 348                         }
 349                         break;
 350                 case BCH_DATA_stripe:
 351                         if (!a.v->stripe) {
 352                                 prt_printf(err, "data_type %s but stripe==0",
 353                                        bch2_data_types[a.v->data_type]);
 354                                 return -EINVAL;
 355                         }
 356                         break;
 357                 }
 358         }
 359
 360         return 0;
 361 }
 362
 363 static inline u64 swab40(u64 x)
 364 {
 365         return (((x & 0x00000000ffULL) << 32)|
 366                 ((x & 0x000000ff00ULL) << 16)|
 367                 ((x & 0x0000ff0000ULL) >>  0)|
 368                 ((x & 0x00ff000000ULL) >> 16)|
 369                 ((x & 0xff00000000ULL) >> 32));
 370 }
 371
 372 void bch2_alloc_v4_swab(struct bkey_s k)
 373 {
 374         struct bch_alloc_v4 *a = bkey_s_to_alloc_v4(k).v;
 375         struct bch_backpointer *bp, *bps;
 376
 377         a->journal_seq          = swab64(a->journal_seq);
 378         a->flags                = swab32(a->flags);
 379         a->dirty_sectors        = swab32(a->dirty_sectors);
 380         a->cached_sectors       = swab32(a->cached_sectors);
 381         a->io_time[0]           = swab64(a->io_time[0]);
 382         a->io_time[1]           = swab64(a->io_time[1]);
 383         a->stripe               = swab32(a->stripe);
 384         a->nr_external_backpointers = swab32(a->nr_external_backpointers);
 385
 386         bps = alloc_v4_backpointers(a);
 387         for (bp = bps; bp < bps + BCH_ALLOC_V4_NR_BACKPOINTERS(a); bp++) {
 388                 bp->bucket_offset       = swab40(bp->bucket_offset);
 389                 bp->bucket_len          = swab32(bp->bucket_len);
 390                 bch2_bpos_swab(&bp->pos);
 391         }
 392 }
 393
 394 void bch2_alloc_to_text(struct printbuf *out, struct bch_fs *c, struct bkey_s_c k)
 395 {
 396         struct bch_alloc_v4 _a;
 397         const struct bch_alloc_v4 *a = &_a;
 398         const struct bch_backpointer *bps;
 399         unsigned i;
 400
 401         if (k.k->type == KEY_TYPE_alloc_v4)
 402                 a = bkey_s_c_to_alloc_v4(k).v;
 403         else
 404                 bch2_alloc_to_v4(k, &_a);
 405
 406         prt_newline(out);
 407         printbuf_indent_add(out, 2);
 408
 409         prt_printf(out, "gen %u oldest_gen %u data_type %s",
 410                a->gen, a->oldest_gen, bch2_data_types[a->data_type]);
 411         prt_newline(out);
 412         prt_printf(out, "journal_seq       %llu",       a->journal_seq);
 413         prt_newline(out);
 414         prt_printf(out, "need_discard      %llu",       BCH_ALLOC_V4_NEED_DISCARD(a));
 415         prt_newline(out);
 416         prt_printf(out, "need_inc_gen      %llu",       BCH_ALLOC_V4_NEED_INC_GEN(a));
 417         prt_newline(out);
 418         prt_printf(out, "dirty_sectors     %u", a->dirty_sectors);
 419         prt_newline(out);
 420         prt_printf(out, "cached_sectors    %u", a->cached_sectors);
 421         prt_newline(out);
 422         prt_printf(out, "stripe            %u", a->stripe);
 423         prt_newline(out);
 424         prt_printf(out, "stripe_redundancy %u", a->stripe_redundancy);
 425         prt_newline(out);
 426         prt_printf(out, "io_time[READ]     %llu",       a->io_time[READ]);
 427         prt_newline(out);
 428         prt_printf(out, "io_time[WRITE]    %llu",       a->io_time[WRITE]);
 429         prt_newline(out);
 430         prt_printf(out, "backpointers:     %llu",       BCH_ALLOC_V4_NR_BACKPOINTERS(a));
 431         printbuf_indent_add(out, 2);
 432
 433         bps = alloc_v4_backpointers_c(a);
 434         for (i = 0; i < BCH_ALLOC_V4_NR_BACKPOINTERS(a); i++) {
 435                 prt_newline(out);
 436                 bch2_backpointer_to_text(out, &bps[i]);
 437         }
 438
 439         printbuf_indent_sub(out, 4);
 440 }
 441
 442 void bch2_alloc_to_v4(struct bkey_s_c k, struct bch_alloc_v4 *out)
 443 {
 444         if (k.k->type == KEY_TYPE_alloc_v4) {
 445                 int d;
 446
 447                 *out = *bkey_s_c_to_alloc_v4(k).v;
 448
 449                 d = (int) BCH_ALLOC_V4_U64s -
 450                         (int) (BCH_ALLOC_V4_BACKPOINTERS_START(out) ?: BCH_ALLOC_V4_U64s_V0);
 451                 if (unlikely(d > 0)) {
 452                         memset((u64 *) out + BCH_ALLOC_V4_BACKPOINTERS_START(out),
 453                                0,
 454                                d * sizeof(u64));
 455                         SET_BCH_ALLOC_V4_BACKPOINTERS_START(out, BCH_ALLOC_V4_U64s);
 456                 }
 457         } else {
 458                 struct bkey_alloc_unpacked u = bch2_alloc_unpack(k);
 459
 460                 *out = (struct bch_alloc_v4) {
 461                         .journal_seq            = u.journal_seq,
 462                         .flags                  = u.need_discard,
 463                         .gen                    = u.gen,
 464                         .oldest_gen             = u.oldest_gen,
 465                         .data_type              = u.data_type,
 466                         .stripe_redundancy      = u.stripe_redundancy,
 467                         .dirty_sectors          = u.dirty_sectors,
 468                         .cached_sectors         = u.cached_sectors,
 469                         .io_time[READ]          = u.read_time,
 470                         .io_time[WRITE]         = u.write_time,
 471                         .stripe                 = u.stripe,
 472                 };
 473
 474                 SET_BCH_ALLOC_V4_BACKPOINTERS_START(out, BCH_ALLOC_V4_U64s);
 475         }
 476 }
 477
 478 struct bkey_i_alloc_v4 *bch2_alloc_to_v4_mut(struct btree_trans *trans, struct bkey_s_c k)
 479 {
 480         unsigned bytes = k.k->type == KEY_TYPE_alloc_v4
 481                 ? bkey_bytes(k.k)
 482                 : sizeof(struct bkey_i_alloc_v4);
 483         struct bkey_i_alloc_v4 *ret;
 484
 485         /*
 486          * Reserve space for one more backpointer here:
 487          * Not sketchy at doing it this way, nope...
 488          */
 489         ret = bch2_trans_kmalloc(trans, bytes + sizeof(struct bch_backpointer));
 490         if (IS_ERR(ret))
 491                 return ret;
 492
 493         if (k.k->type == KEY_TYPE_alloc_v4) {
 494                 bkey_reassemble(&ret->k_i, k);
 495
 496                 if (BCH_ALLOC_V4_BACKPOINTERS_START(&ret->v) < BCH_ALLOC_V4_U64s) {
 497                         struct bch_backpointer *src, *dst;
 498
 499                         src = alloc_v4_backpointers(&ret->v);
 500                         SET_BCH_ALLOC_V4_BACKPOINTERS_START(&ret->v, BCH_ALLOC_V4_U64s);
 501                         dst = alloc_v4_backpointers(&ret->v);
 502
 503                         memmove(dst, src, BCH_ALLOC_V4_NR_BACKPOINTERS(&ret->v) *
 504                                 sizeof(struct bch_backpointer));
 505                         memset(src, 0, dst - src);
 506                         set_alloc_v4_u64s(ret);
 507                 }
 508         } else {
 509                 bkey_alloc_v4_init(&ret->k_i);
 510                 ret->k.p = k.k->p;
 511                 bch2_alloc_to_v4(k, &ret->v);
 512         }
 513         return ret;
 514 }
 515
 516 int bch2_alloc_read(struct bch_fs *c)
 517 {
 518         struct btree_trans trans;
 519         struct btree_iter iter;
 520         struct bkey_s_c k;
 521         struct bch_alloc_v4 a;
 522         struct bch_dev *ca;
 523         int ret;
 524
 525         bch2_trans_init(&trans, c, 0, 0);
 526
 527         for_each_btree_key(&trans, iter, BTREE_ID_alloc, POS_MIN,
 528                            BTREE_ITER_PREFETCH, k, ret) {
 529                 /*
 530                  * Not a fsck error because this is checked/repaired by
 531                  * bch2_check_alloc_key() which runs later:
 532                  */
 533                 if (!bch2_dev_bucket_exists(c, k.k->p))
 534                         continue;
 535
 536                 ca = bch_dev_bkey_exists(c, k.k->p.inode);
 537                 bch2_alloc_to_v4(k, &a);
 538
 539                 *bucket_gen(ca, k.k->p.offset) = a.gen;
 540         }
 541         bch2_trans_iter_exit(&trans, &iter);
 542
 543         bch2_trans_exit(&trans);
 544
 545         if (ret)
 546                 bch_err(c, "error reading alloc info: %i", ret);
 547
 548         return ret;
 549 }
 550
 551 /* Free space/discard btree: */
 552
 553 static int bch2_bucket_do_index(struct btree_trans *trans,
 554                                 struct bkey_s_c alloc_k,
 555                                 const struct bch_alloc_v4 *a,
 556                                 bool set)
 557 {
 558         struct bch_fs *c = trans->c;
 559         struct bch_dev *ca = bch_dev_bkey_exists(c, alloc_k.k->p.inode);
 560         struct btree_iter iter;
 561         struct bkey_s_c old;
 562         struct bkey_i *k;
 563         enum btree_id btree;
 564         enum bch_bkey_type old_type = !set ? KEY_TYPE_set : KEY_TYPE_deleted;
 565         enum bch_bkey_type new_type =  set ? KEY_TYPE_set : KEY_TYPE_deleted;
 566         struct printbuf buf = PRINTBUF;
 567         int ret;
 568
 569         if (a->data_type != BCH_DATA_free &&
 570             a->data_type != BCH_DATA_need_discard)
 571                 return 0;
 572
 573         k = bch2_trans_kmalloc(trans, sizeof(*k));
 574         if (IS_ERR(k))
 575                 return PTR_ERR(k);
 576
 577         bkey_init(&k->k);
 578         k->k.type = new_type;
 579
 580         switch (a->data_type) {
 581         case BCH_DATA_free:
 582                 btree = BTREE_ID_freespace;
 583                 k->k.p = alloc_freespace_pos(alloc_k.k->p, *a);
 584                 bch2_key_resize(&k->k, 1);
 585                 break;
 586         case BCH_DATA_need_discard:
 587                 btree = BTREE_ID_need_discard;
 588                 k->k.p = alloc_k.k->p;
 589                 break;
 590         default:
 591                 return 0;
 592         }
 593
 594         bch2_trans_iter_init(trans, &iter, btree,
 595                              bkey_start_pos(&k->k),
 596                              BTREE_ITER_INTENT);
 597         old = bch2_btree_iter_peek_slot(&iter);
 598         ret = bkey_err(old);
 599         if (ret)
 600                 goto err;
 601
 602         if (ca->mi.freespace_initialized &&
 603             bch2_trans_inconsistent_on(old.k->type != old_type, trans,
 604                         "incorrect key when %s %s btree (got %s should be %s)\n"
 605                         "  for %s",
 606                         set ? "setting" : "clearing",
 607                         bch2_btree_ids[btree],
 608                         bch2_bkey_types[old.k->type],
 609                         bch2_bkey_types[old_type],
 610                         (bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf))) {
 611                 ret = -EIO;
 612                 goto err;
 613         }
 614
 615         ret = bch2_trans_update(trans, &iter, k, 0);
 616 err:
 617         bch2_trans_iter_exit(trans, &iter);
 618         printbuf_exit(&buf);
 619         return ret;
 620 }
 621
 622 int bch2_trans_mark_alloc(struct btree_trans *trans,
 623                           enum btree_id btree_id, unsigned level,
 624                           struct bkey_s_c old, struct bkey_i *new,
 625                           unsigned flags)
 626 {
 627         struct bch_fs *c = trans->c;
 628         struct bch_alloc_v4 old_a, *new_a;
 629         u64 old_lru, new_lru;
 630         int ret = 0;
 631
 632         /*
 633          * Deletion only happens in the device removal path, with
 634          * BTREE_TRIGGER_NORUN:
 635          */
 636         BUG_ON(new->k.type != KEY_TYPE_alloc_v4);
 637
 638         bch2_alloc_to_v4(old, &old_a);
 639         new_a = &bkey_i_to_alloc_v4(new)->v;
 640
 641         new_a->data_type = alloc_data_type(*new_a, new_a->data_type);
 642
 643         if (new_a->dirty_sectors > old_a.dirty_sectors ||
 644             new_a->cached_sectors > old_a.cached_sectors) {
 645                 new_a->io_time[READ] = max_t(u64, 1, atomic64_read(&c->io_clock[READ].now));
 646                 new_a->io_time[WRITE]= max_t(u64, 1, atomic64_read(&c->io_clock[WRITE].now));
 647                 SET_BCH_ALLOC_V4_NEED_INC_GEN(new_a, true);
 648                 SET_BCH_ALLOC_V4_NEED_DISCARD(new_a, true);
 649         }
 650
 651         if (data_type_is_empty(new_a->data_type) &&
 652             BCH_ALLOC_V4_NEED_INC_GEN(new_a) &&
 653             !bch2_bucket_is_open_safe(c, new->k.p.inode, new->k.p.offset)) {
 654                 new_a->gen++;
 655                 SET_BCH_ALLOC_V4_NEED_INC_GEN(new_a, false);
 656         }
 657
 658         if (old_a.data_type != new_a->data_type ||
 659             (new_a->data_type == BCH_DATA_free &&
 660              alloc_freespace_genbits(old_a) != alloc_freespace_genbits(*new_a))) {
 661                 ret =   bch2_bucket_do_index(trans, old, &old_a, false) ?:
 662                         bch2_bucket_do_index(trans, bkey_i_to_s_c(new), new_a, true);
 663                 if (ret)
 664                         return ret;
 665         }
 666
 667         if (new_a->data_type == BCH_DATA_cached &&
 668             !new_a->io_time[READ])
 669                 new_a->io_time[READ] = max_t(u64, 1, atomic64_read(&c->io_clock[READ].now));
 670
 671         old_lru = alloc_lru_idx(old_a);
 672         new_lru = alloc_lru_idx(*new_a);
 673
 674         if (old_lru != new_lru) {
 675                 ret = bch2_lru_change(trans, new->k.p.inode, new->k.p.offset,
 676                                       old_lru, &new_lru, old);
 677                 if (ret)
 678                         return ret;
 679
 680                 if (new_a->data_type == BCH_DATA_cached)
 681                         new_a->io_time[READ] = new_lru;
 682         }
 683
 684         return 0;
 685 }
 686
 687 static int bch2_check_alloc_key(struct btree_trans *trans,
 688                                 struct btree_iter *alloc_iter,
 689                                 struct btree_iter *discard_iter,
 690                                 struct btree_iter *freespace_iter)
 691 {
 692         struct bch_fs *c = trans->c;
 693         struct bch_dev *ca;
 694         struct bch_alloc_v4 a;
 695         unsigned discard_key_type, freespace_key_type;
 696         struct bkey_s_c alloc_k, k;
 697         struct printbuf buf = PRINTBUF;
 698         int ret;
 699
 700         alloc_k = bch2_dev_bucket_exists(c, alloc_iter->pos)
 701                 ? bch2_btree_iter_peek_slot(alloc_iter)
 702                 : bch2_btree_iter_peek(alloc_iter);
 703         if (!alloc_k.k)
 704                 return 1;
 705
 706         ret = bkey_err(alloc_k);
 707         if (ret)
 708                 return ret;
 709
 710         if (fsck_err_on(!bch2_dev_bucket_exists(c, alloc_k.k->p), c,
 711                         "alloc key for invalid device:bucket %llu:%llu",
 712                         alloc_k.k->p.inode, alloc_k.k->p.offset))
 713                 return bch2_btree_delete_at(trans, alloc_iter, 0);
 714
 715         ca = bch_dev_bkey_exists(c, alloc_k.k->p.inode);
 716         if (!ca->mi.freespace_initialized)
 717                 return 0;
 718
 719         bch2_alloc_to_v4(alloc_k, &a);
 720
 721         discard_key_type = a.data_type == BCH_DATA_need_discard
 722                 ? KEY_TYPE_set : 0;
 723         freespace_key_type = a.data_type == BCH_DATA_free
 724                 ? KEY_TYPE_set : 0;
 725
 726         bch2_btree_iter_set_pos(discard_iter, alloc_k.k->p);
 727         bch2_btree_iter_set_pos(freespace_iter, alloc_freespace_pos(alloc_k.k->p, a));
 728
 729         k = bch2_btree_iter_peek_slot(discard_iter);
 730         ret = bkey_err(k);
 731         if (ret)
 732                 goto err;
 733
 734         if (k.k->type != discard_key_type &&
 735             (c->opts.reconstruct_alloc ||
 736              fsck_err(c, "incorrect key in need_discard btree (got %s should be %s)\n"
 737                       "  %s",
 738                       bch2_bkey_types[k.k->type],
 739                       bch2_bkey_types[discard_key_type],
 740                       (bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf)))) {
 741                 struct bkey_i *update =
 742                         bch2_trans_kmalloc(trans, sizeof(*update));
 743
 744                 ret = PTR_ERR_OR_ZERO(update);
 745                 if (ret)
 746                         goto err;
 747
 748                 bkey_init(&update->k);
 749                 update->k.type  = discard_key_type;
 750                 update->k.p     = discard_iter->pos;
 751
 752                 ret = bch2_trans_update(trans, discard_iter, update, 0);
 753                 if (ret)
 754                         goto err;
 755         }
 756
 757         k = bch2_btree_iter_peek_slot(freespace_iter);
 758         ret = bkey_err(k);
 759         if (ret)
 760                 goto err;
 761
 762         if (k.k->type != freespace_key_type &&
 763             (c->opts.reconstruct_alloc ||
 764              fsck_err(c, "incorrect key in freespace btree (got %s should be %s)\n"
 765                       "  %s",
 766                       bch2_bkey_types[k.k->type],
 767                       bch2_bkey_types[freespace_key_type],
 768                       (printbuf_reset(&buf),
 769                        bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf)))) {
 770                 struct bkey_i *update =
 771                         bch2_trans_kmalloc(trans, sizeof(*update));
 772
 773                 ret = PTR_ERR_OR_ZERO(update);
 774                 if (ret)
 775                         goto err;
 776
 777                 bkey_init(&update->k);
 778                 update->k.type  = freespace_key_type;
 779                 update->k.p     = freespace_iter->pos;
 780                 bch2_key_resize(&update->k, 1);
 781
 782                 ret = bch2_trans_update(trans, freespace_iter, update, 0);
 783                 if (ret)
 784                         goto err;
 785         }
 786 err:
 787 fsck_err:
 788         printbuf_exit(&buf);
 789         return ret;
 790 }
 791
 792 static int bch2_check_discard_freespace_key(struct btree_trans *trans,
 793                                             struct btree_iter *iter)
 794 {
 795         struct bch_fs *c = trans->c;
 796         struct btree_iter alloc_iter;
 797         struct bkey_s_c k, freespace_k;
 798         struct bch_alloc_v4 a;
 799         u64 genbits;
 800         struct bpos pos;
 801         enum bch_data_type state = iter->btree_id == BTREE_ID_need_discard
 802                 ? BCH_DATA_need_discard
 803                 : BCH_DATA_free;
 804         struct printbuf buf = PRINTBUF;
 805         int ret;
 806
 807         freespace_k = bch2_btree_iter_peek(iter);
 808         if (!freespace_k.k)
 809                 return 1;
 810
 811         ret = bkey_err(freespace_k);
 812         if (ret)
 813                 return ret;
 814
 815         pos = iter->pos;
 816         pos.offset &= ~(~0ULL << 56);
 817         genbits = iter->pos.offset & (~0ULL << 56);
 818
 819         bch2_trans_iter_init(trans, &alloc_iter, BTREE_ID_alloc, pos, 0);
 820
 821         if (fsck_err_on(!bch2_dev_bucket_exists(c, pos), c,
 822                         "entry in %s btree for nonexistant dev:bucket %llu:%llu",
 823                         bch2_btree_ids[iter->btree_id], pos.inode, pos.offset))
 824                 goto delete;
 825
 826         k = bch2_btree_iter_peek_slot(&alloc_iter);
 827         ret = bkey_err(k);
 828         if (ret)
 829                 goto err;
 830
 831         bch2_alloc_to_v4(k, &a);
 832
 833         if (fsck_err_on(a.data_type != state ||
 834                         (state == BCH_DATA_free &&
 835                          genbits != alloc_freespace_genbits(a)), c,
 836                         "%s\n  incorrectly set in %s index (free %u, genbits %llu should be %llu)",
 837                         (bch2_bkey_val_to_text(&buf, c, k), buf.buf),
 838                         bch2_btree_ids[iter->btree_id],
 839                         a.data_type == state,
 840                         genbits >> 56, alloc_freespace_genbits(a) >> 56))
 841                 goto delete;
 842 out:
 843 err:
 844 fsck_err:
 845         bch2_trans_iter_exit(trans, &alloc_iter);
 846         printbuf_exit(&buf);
 847         return ret;
 848 delete:
 849         ret = bch2_btree_delete_extent_at(trans, iter,
 850                         iter->btree_id == BTREE_ID_freespace ? 1 : 0, 0);
 851         goto out;
 852 }
 853
 854 int bch2_check_alloc_info(struct bch_fs *c)
 855 {
 856         struct btree_trans trans;
 857         struct btree_iter iter, discard_iter, freespace_iter;
 858         int ret = 0;
 859
 860         bch2_trans_init(&trans, c, 0, 0);
 861
 862         bch2_trans_iter_init(&trans, &iter, BTREE_ID_alloc, POS_MIN,
 863                              BTREE_ITER_PREFETCH);
 864         bch2_trans_iter_init(&trans, &discard_iter, BTREE_ID_need_discard, POS_MIN,
 865                              BTREE_ITER_PREFETCH);
 866         bch2_trans_iter_init(&trans, &freespace_iter, BTREE_ID_freespace, POS_MIN,
 867                              BTREE_ITER_PREFETCH);
 868         while (1) {
 869                 ret = commit_do(&trans, NULL, NULL,
 870                                       BTREE_INSERT_NOFAIL|
 871                                       BTREE_INSERT_LAZY_RW,
 872                         bch2_check_alloc_key(&trans, &iter,
 873                                              &discard_iter,
 874                                              &freespace_iter));
 875                 if (ret)
 876                         break;
 877
 878                 bch2_btree_iter_advance(&iter);
 879         }
 880         bch2_trans_iter_exit(&trans, &freespace_iter);
 881         bch2_trans_iter_exit(&trans, &discard_iter);
 882         bch2_trans_iter_exit(&trans, &iter);
 883
 884         if (ret < 0)
 885                 goto err;
 886
 887         bch2_trans_iter_init(&trans, &iter, BTREE_ID_need_discard, POS_MIN,
 888                              BTREE_ITER_PREFETCH);
 889         while (1) {
 890                 ret = commit_do(&trans, NULL, NULL,
 891                                       BTREE_INSERT_NOFAIL|
 892                                       BTREE_INSERT_LAZY_RW,
 893                         bch2_check_discard_freespace_key(&trans, &iter));
 894                 if (ret)
 895                         break;
 896
 897                 bch2_btree_iter_advance(&iter);
 898         }
 899         bch2_trans_iter_exit(&trans, &iter);
 900
 901         if (ret < 0)
 902                 goto err;
 903
 904         bch2_trans_iter_init(&trans, &iter, BTREE_ID_freespace, POS_MIN,
 905                              BTREE_ITER_PREFETCH);
 906         while (1) {
 907                 ret = commit_do(&trans, NULL, NULL,
 908                                       BTREE_INSERT_NOFAIL|
 909                                       BTREE_INSERT_LAZY_RW,
 910                         bch2_check_discard_freespace_key(&trans, &iter));
 911                 if (ret)
 912                         break;
 913
 914                 bch2_btree_iter_advance(&iter);
 915         }
 916         bch2_trans_iter_exit(&trans, &iter);
 917 err:
 918         bch2_trans_exit(&trans);
 919         return ret < 0 ? ret : 0;
 920 }
 921
 922 static int bch2_check_alloc_to_lru_ref(struct btree_trans *trans,
 923                                        struct btree_iter *alloc_iter)
 924 {
 925         struct bch_fs *c = trans->c;
 926         struct btree_iter lru_iter;
 927         struct bch_alloc_v4 a;
 928         struct bkey_s_c alloc_k, k;
 929         struct printbuf buf = PRINTBUF;
 930         struct printbuf buf2 = PRINTBUF;
 931         int ret;
 932
 933         alloc_k = bch2_btree_iter_peek(alloc_iter);
 934         if (!alloc_k.k)
 935                 return 0;
 936
 937         ret = bkey_err(alloc_k);
 938         if (ret)
 939                 return ret;
 940
 941         bch2_alloc_to_v4(alloc_k, &a);
 942
 943         if (a.data_type != BCH_DATA_cached)
 944                 return 0;
 945
 946         bch2_trans_iter_init(trans, &lru_iter, BTREE_ID_lru,
 947                              POS(alloc_k.k->p.inode, a.io_time[READ]), 0);
 948
 949         k = bch2_btree_iter_peek_slot(&lru_iter);
 950         ret = bkey_err(k);
 951         if (ret)
 952                 goto err;
 953
 954         if (fsck_err_on(!a.io_time[READ], c,
 955                         "cached bucket with read_time 0\n"
 956                         "  %s",
 957                 (printbuf_reset(&buf),
 958                  bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf)) ||
 959             fsck_err_on(k.k->type != KEY_TYPE_lru ||
 960                         le64_to_cpu(bkey_s_c_to_lru(k).v->idx) != alloc_k.k->p.offset, c,
 961                         "incorrect/missing lru entry\n"
 962                         "  %s\n"
 963                         "  %s",
 964                         (printbuf_reset(&buf),
 965                          bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf),
 966                         (bch2_bkey_val_to_text(&buf2, c, k), buf2.buf))) {
 967                 u64 read_time = a.io_time[READ];
 968
 969                 if (!a.io_time[READ])
 970                         a.io_time[READ] = atomic64_read(&c->io_clock[READ].now);
 971
 972                 ret = bch2_lru_set(trans,
 973                                    alloc_k.k->p.inode,
 974                                    alloc_k.k->p.offset,
 975                                    &a.io_time[READ]);
 976                 if (ret)
 977                         goto err;
 978
 979                 if (a.io_time[READ] != read_time) {
 980                         struct bkey_i_alloc_v4 *a_mut =
 981                                 bch2_alloc_to_v4_mut(trans, alloc_k);
 982                         ret = PTR_ERR_OR_ZERO(a_mut);
 983                         if (ret)
 984                                 goto err;
 985
 986                         a_mut->v.io_time[READ] = a.io_time[READ];
 987                         ret = bch2_trans_update(trans, alloc_iter,
 988                                                 &a_mut->k_i, BTREE_TRIGGER_NORUN);
 989                         if (ret)
 990                                 goto err;
 991                 }
 992         }
 993 err:
 994 fsck_err:
 995         bch2_trans_iter_exit(trans, &lru_iter);
 996         printbuf_exit(&buf2);
 997         printbuf_exit(&buf);
 998         return ret;
 999 }
1000
1001 int bch2_check_alloc_to_lru_refs(struct bch_fs *c)
1002 {
1003         struct btree_trans trans;
1004         struct btree_iter iter;
1005         struct bkey_s_c k;
1006         int ret = 0;
1007
1008         bch2_trans_init(&trans, c, 0, 0);
1009
1010         for_each_btree_key_commit(&trans, iter, BTREE_ID_alloc,
1011                         POS_MIN, BTREE_ITER_PREFETCH, k,
1012                         NULL, NULL, BTREE_INSERT_NOFAIL|BTREE_INSERT_LAZY_RW,
1013                 bch2_check_alloc_to_lru_ref(&trans, &iter));
1014
1015         bch2_trans_exit(&trans);
1016         return ret < 0 ? ret : 0;
1017 }
1018
1019 static int bch2_clear_need_discard(struct btree_trans *trans, struct bpos pos,
1020                                    struct bch_dev *ca, bool *discard_done)
1021 {
1022         struct bch_fs *c = trans->c;
1023         struct btree_iter iter;
1024         struct bkey_s_c k;
1025         struct bkey_i_alloc_v4 *a;
1026         struct printbuf buf = PRINTBUF;
1027         int ret;
1028
1029         bch2_trans_iter_init(trans, &iter, BTREE_ID_alloc, pos,
1030                              BTREE_ITER_CACHED);
1031         k = bch2_btree_iter_peek_slot(&iter);
1032         ret = bkey_err(k);
1033         if (ret)
1034                 goto out;
1035
1036         a = bch2_alloc_to_v4_mut(trans, k);
1037         ret = PTR_ERR_OR_ZERO(a);
1038         if (ret)
1039                 goto out;
1040
1041         if (BCH_ALLOC_V4_NEED_INC_GEN(&a->v)) {
1042                 a->v.gen++;
1043                 SET_BCH_ALLOC_V4_NEED_INC_GEN(&a->v, false);
1044                 goto write;
1045         }
1046
1047         if (bch2_trans_inconsistent_on(a->v.journal_seq > c->journal.flushed_seq_ondisk, trans,
1048                         "clearing need_discard but journal_seq %llu > flushed_seq %llu\n"
1049                         "%s",
1050                         a->v.journal_seq,
1051                         c->journal.flushed_seq_ondisk,
1052                         (bch2_bkey_val_to_text(&buf, c, k), buf.buf))) {
1053                 ret = -EIO;
1054                 goto out;
1055         }
1056
1057         if (bch2_trans_inconsistent_on(a->v.data_type != BCH_DATA_need_discard, trans,
1058                         "bucket incorrectly set in need_discard btree\n"
1059                         "%s",
1060                         (bch2_bkey_val_to_text(&buf, c, k), buf.buf))) {
1061                 ret = -EIO;
1062                 goto out;
1063         }
1064
1065         if (!*discard_done && ca->mi.discard && !c->opts.nochanges) {
1066                 /*
1067                  * This works without any other locks because this is the only
1068                  * thread that removes items from the need_discard tree
1069                  */
1070                 bch2_trans_unlock(trans);
1071                 blkdev_issue_discard(ca->disk_sb.bdev,
1072                                      k.k->p.offset * ca->mi.bucket_size,
1073                                      ca->mi.bucket_size,
1074                                      GFP_KERNEL, 0);
1075                 *discard_done = true;
1076
1077                 ret = bch2_trans_relock(trans) ? 0 : -EINTR;
1078                 if (ret)
1079                         goto out;
1080         }
1081
1082         SET_BCH_ALLOC_V4_NEED_DISCARD(&a->v, false);
1083         a->v.data_type = alloc_data_type(a->v, a->v.data_type);
1084 write:
1085         ret = bch2_trans_update(trans, &iter, &a->k_i, 0);
1086 out:
1087         bch2_trans_iter_exit(trans, &iter);
1088         printbuf_exit(&buf);
1089         return ret;
1090 }
1091
1092 static void bch2_do_discards_work(struct work_struct *work)
1093 {
1094         struct bch_fs *c = container_of(work, struct bch_fs, discard_work);
1095         struct bch_dev *ca = NULL;
1096         struct btree_trans trans;
1097         struct btree_iter iter;
1098         struct bkey_s_c k;
1099         u64 seen = 0, open = 0, need_journal_commit = 0, discarded = 0;
1100         int ret;
1101
1102         bch2_trans_init(&trans, c, 0, 0);
1103
1104         for_each_btree_key(&trans, iter, BTREE_ID_need_discard,
1105                            POS_MIN, 0, k, ret) {
1106                 bool discard_done = false;
1107
1108                 if (ca && k.k->p.inode != ca->dev_idx) {
1109                         percpu_ref_put(&ca->io_ref);
1110                         ca = NULL;
1111                 }
1112
1113                 if (!ca) {
1114                         ca = bch_dev_bkey_exists(c, k.k->p.inode);
1115                         if (!percpu_ref_tryget(&ca->io_ref)) {
1116                                 ca = NULL;
1117                                 bch2_btree_iter_set_pos(&iter, POS(k.k->p.inode + 1, 0));
1118                                 continue;
1119                         }
1120                 }
1121
1122                 seen++;
1123
1124                 if (bch2_bucket_is_open_safe(c, k.k->p.inode, k.k->p.offset)) {
1125                         open++;
1126                         continue;
1127                 }
1128
1129                 if (bch2_bucket_needs_journal_commit(&c->buckets_waiting_for_journal,
1130                                 c->journal.flushed_seq_ondisk,
1131                                 k.k->p.inode, k.k->p.offset)) {
1132                         need_journal_commit++;
1133                         continue;
1134                 }
1135
1136                 ret = commit_do(&trans, NULL, NULL,
1137                                       BTREE_INSERT_USE_RESERVE|
1138                                       BTREE_INSERT_NOFAIL,
1139                                 bch2_clear_need_discard(&trans, k.k->p, ca, &discard_done));
1140                 if (ret)
1141                         break;
1142
1143                 this_cpu_inc(c->counters[BCH_COUNTER_bucket_discard]);
1144                 discarded++;
1145         }
1146         bch2_trans_iter_exit(&trans, &iter);
1147
1148         if (ca)
1149                 percpu_ref_put(&ca->io_ref);
1150
1151         bch2_trans_exit(&trans);
1152
1153         if (need_journal_commit * 2 > seen)
1154                 bch2_journal_flush_async(&c->journal, NULL);
1155
1156         percpu_ref_put(&c->writes);
1157
1158         trace_discard_buckets(c, seen, open, need_journal_commit, discarded, ret);
1159 }
1160
1161 void bch2_do_discards(struct bch_fs *c)
1162 {
1163         if (percpu_ref_tryget_live(&c->writes) &&
1164             !queue_work(system_long_wq, &c->discard_work))
1165                 percpu_ref_put(&c->writes);
1166 }
1167
1168 static int invalidate_one_bucket(struct btree_trans *trans, struct bch_dev *ca,
1169                                  struct bpos *bucket_pos, unsigned *cached_sectors)
1170 {
1171         struct bch_fs *c = trans->c;
1172         struct btree_iter lru_iter, alloc_iter = { NULL };
1173         struct bkey_s_c k;
1174         struct bkey_i_alloc_v4 *a;
1175         u64 bucket, idx;
1176         struct printbuf buf = PRINTBUF;
1177         int ret;
1178
1179         bch2_trans_iter_init(trans, &lru_iter, BTREE_ID_lru,
1180                              POS(ca->dev_idx, 0), 0);
1181 next_lru:
1182         k = bch2_btree_iter_peek(&lru_iter);
1183         ret = bkey_err(k);
1184         if (ret)
1185                 goto out;
1186
1187         if (!k.k || k.k->p.inode != ca->dev_idx) {
1188                 ret = 1;
1189                 goto out;
1190         }
1191
1192         if (k.k->type != KEY_TYPE_lru) {
1193                 prt_printf(&buf, "non lru key in lru btree:\n  ");
1194                 bch2_bkey_val_to_text(&buf, c, k);
1195
1196                 if (!test_bit(BCH_FS_CHECK_LRUS_DONE, &c->flags)) {
1197                         bch_err(c, "%s", buf.buf);
1198                         bch2_btree_iter_advance(&lru_iter);
1199                         goto next_lru;
1200                 } else {
1201                         bch2_trans_inconsistent(trans, "%s", buf.buf);
1202                         ret = -EINVAL;
1203                         goto out;
1204                 }
1205         }
1206
1207         idx     = k.k->p.offset;
1208         bucket  = le64_to_cpu(bkey_s_c_to_lru(k).v->idx);
1209
1210         *bucket_pos = POS(ca->dev_idx, bucket);
1211
1212         a = bch2_trans_start_alloc_update(trans, &alloc_iter, *bucket_pos);
1213         ret = PTR_ERR_OR_ZERO(a);
1214         if (ret)
1215                 goto out;
1216
1217         if (idx != alloc_lru_idx(a->v)) {
1218                 prt_printf(&buf, "alloc key does not point back to lru entry when invalidating bucket:\n  ");
1219                 bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&a->k_i));
1220                 prt_printf(&buf, "\n  ");
1221                 bch2_bkey_val_to_text(&buf, c, k);
1222
1223                 if (!test_bit(BCH_FS_CHECK_LRUS_DONE, &c->flags)) {
1224                         bch_err(c, "%s", buf.buf);
1225                         bch2_btree_iter_advance(&lru_iter);
1226                         goto next_lru;
1227                 } else {
1228                         bch2_trans_inconsistent(trans, "%s", buf.buf);
1229                         ret = -EINVAL;
1230                         goto out;
1231                 }
1232         }
1233
1234         if (!a->v.cached_sectors)
1235                 bch_err(c, "invalidating empty bucket, confused");
1236
1237         *cached_sectors = a->v.cached_sectors;
1238
1239         SET_BCH_ALLOC_V4_NEED_INC_GEN(&a->v, false);
1240         a->v.gen++;
1241         a->v.data_type          = 0;
1242         a->v.dirty_sectors      = 0;
1243         a->v.cached_sectors     = 0;
1244         a->v.io_time[READ]      = atomic64_read(&c->io_clock[READ].now);
1245         a->v.io_time[WRITE]     = atomic64_read(&c->io_clock[WRITE].now);
1246
1247         ret = bch2_trans_update(trans, &alloc_iter, &a->k_i,
1248                                 BTREE_TRIGGER_BUCKET_INVALIDATE);
1249         if (ret)
1250                 goto out;
1251 out:
1252         bch2_trans_iter_exit(trans, &alloc_iter);
1253         bch2_trans_iter_exit(trans, &lru_iter);
1254         printbuf_exit(&buf);
1255         return ret;
1256 }
1257
1258 static void bch2_do_invalidates_work(struct work_struct *work)
1259 {
1260         struct bch_fs *c = container_of(work, struct bch_fs, invalidate_work);
1261         struct bch_dev *ca;
1262         struct btree_trans trans;
1263         struct bpos bucket;
1264         unsigned i, sectors;
1265         int ret = 0;
1266
1267         bch2_trans_init(&trans, c, 0, 0);
1268
1269         for_each_member_device(ca, c, i) {
1270                 s64 nr_to_invalidate =
1271                         should_invalidate_buckets(ca, bch2_dev_usage_read(ca));
1272
1273                 while (nr_to_invalidate-- >= 0) {
1274                         ret = commit_do(&trans, NULL, NULL,
1275                                               BTREE_INSERT_USE_RESERVE|
1276                                               BTREE_INSERT_NOFAIL,
1277                                         invalidate_one_bucket(&trans, ca, &bucket,
1278                                                               &sectors));
1279                         if (ret)
1280                                 break;
1281
1282                         trace_invalidate_bucket(c, bucket.inode, bucket.offset, sectors);
1283                         this_cpu_inc(c->counters[BCH_COUNTER_bucket_invalidate]);
1284                 }
1285         }
1286
1287         bch2_trans_exit(&trans);
1288         percpu_ref_put(&c->writes);
1289 }
1290
1291 void bch2_do_invalidates(struct bch_fs *c)
1292 {
1293         if (percpu_ref_tryget_live(&c->writes) &&
1294             !queue_work(system_long_wq, &c->invalidate_work))
1295                 percpu_ref_put(&c->writes);
1296 }
1297
1298 static int bucket_freespace_init(struct btree_trans *trans, struct btree_iter *iter)
1299 {
1300         struct bch_alloc_v4 a;
1301         struct bkey_s_c k;
1302         int ret;
1303
1304         k = bch2_btree_iter_peek_slot(iter);
1305         ret = bkey_err(k);
1306         if (ret)
1307                 return ret;
1308
1309         bch2_alloc_to_v4(k, &a);
1310         return bch2_bucket_do_index(trans, k, &a, true);
1311 }
1312
1313 static int bch2_dev_freespace_init(struct bch_fs *c, struct bch_dev *ca)
1314 {
1315         struct btree_trans trans;
1316         struct btree_iter iter;
1317         struct bkey_s_c k;
1318         struct bch_member *m;
1319         int ret;
1320
1321         bch2_trans_init(&trans, c, 0, 0);
1322
1323         for_each_btree_key(&trans, iter, BTREE_ID_alloc,
1324                            POS(ca->dev_idx, ca->mi.first_bucket),
1325                            BTREE_ITER_SLOTS|
1326                            BTREE_ITER_PREFETCH, k, ret) {
1327                 if (iter.pos.offset >= ca->mi.nbuckets)
1328                         break;
1329
1330                 ret = commit_do(&trans, NULL, NULL,
1331                                       BTREE_INSERT_LAZY_RW,
1332                                  bucket_freespace_init(&trans, &iter));
1333                 if (ret)
1334                         break;
1335         }
1336         bch2_trans_iter_exit(&trans, &iter);
1337
1338         bch2_trans_exit(&trans);
1339
1340         if (ret) {
1341                 bch_err(ca, "error initializing free space: %i", ret);
1342                 return ret;
1343         }
1344
1345         mutex_lock(&c->sb_lock);
1346         m = bch2_sb_get_members(c->disk_sb.sb)->members + ca->dev_idx;
1347         SET_BCH_MEMBER_FREESPACE_INITIALIZED(m, true);
1348         mutex_unlock(&c->sb_lock);
1349
1350         return ret;
1351 }
1352
1353 int bch2_fs_freespace_init(struct bch_fs *c)
1354 {
1355         struct bch_dev *ca;
1356         unsigned i;
1357         int ret = 0;
1358         bool doing_init = false;
1359
1360         /*
1361          * We can crash during the device add path, so we need to check this on
1362          * every mount:
1363          */
1364
1365         for_each_member_device(ca, c, i) {
1366                 if (ca->mi.freespace_initialized)
1367                         continue;
1368
1369                 if (!doing_init) {
1370                         bch_info(c, "initializing freespace");
1371                         doing_init = true;
1372                 }
1373
1374                 ret = bch2_dev_freespace_init(c, ca);
1375                 if (ret) {
1376                         percpu_ref_put(&ca->ref);
1377                         return ret;
1378                 }
1379         }
1380
1381         if (doing_init) {
1382                 mutex_lock(&c->sb_lock);
1383                 bch2_write_super(c);
1384                 mutex_unlock(&c->sb_lock);
1385
1386                 bch_verbose(c, "done initializing freespace");
1387         }
1388
1389         return ret;
1390 }
1391
1392 /* Bucket IO clocks: */
1393
1394 int bch2_bucket_io_time_reset(struct btree_trans *trans, unsigned dev,
1395                               size_t bucket_nr, int rw)
1396 {
1397         struct bch_fs *c = trans->c;
1398         struct btree_iter iter;
1399         struct bkey_i_alloc_v4 *a;
1400         u64 now;
1401         int ret = 0;
1402
1403         a = bch2_trans_start_alloc_update(trans, &iter,  POS(dev, bucket_nr));
1404         ret = PTR_ERR_OR_ZERO(a);
1405         if (ret)
1406                 return ret;
1407
1408         now = atomic64_read(&c->io_clock[rw].now);
1409         if (a->v.io_time[rw] == now)
1410                 goto out;
1411
1412         a->v.io_time[rw] = now;
1413
1414         ret   = bch2_trans_update(trans, &iter, &a->k_i, 0) ?:
1415                 bch2_trans_commit(trans, NULL, NULL, 0);
1416 out:
1417         bch2_trans_iter_exit(trans, &iter);
1418         return ret;
1419 }
1420
1421 /* Startup/shutdown (ro/rw): */
1422
1423 void bch2_recalc_capacity(struct bch_fs *c)
1424 {
1425         struct bch_dev *ca;
1426         u64 capacity = 0, reserved_sectors = 0, gc_reserve;
1427         unsigned bucket_size_max = 0;
1428         unsigned long ra_pages = 0;
1429         unsigned i;
1430
1431         lockdep_assert_held(&c->state_lock);
1432
1433         for_each_online_member(ca, c, i) {
1434                 struct backing_dev_info *bdi = ca->disk_sb.bdev->bd_disk->bdi;
1435
1436                 ra_pages += bdi->ra_pages;
1437         }
1438
1439         bch2_set_ra_pages(c, ra_pages);
1440
1441         for_each_rw_member(ca, c, i) {
1442                 u64 dev_reserve = 0;
1443
1444                 /*
1445                  * We need to reserve buckets (from the number
1446                  * of currently available buckets) against
1447                  * foreground writes so that mainly copygc can
1448                  * make forward progress.
1449                  *
1450                  * We need enough to refill the various reserves
1451                  * from scratch - copygc will use its entire
1452                  * reserve all at once, then run against when
1453                  * its reserve is refilled (from the formerly
1454                  * available buckets).
1455                  *
1456                  * This reserve is just used when considering if
1457                  * allocations for foreground writes must wait -
1458                  * not -ENOSPC calculations.
1459                  */
1460
1461                 dev_reserve += ca->nr_btree_reserve * 2;
1462                 dev_reserve += ca->mi.nbuckets >> 6; /* copygc reserve */
1463
1464                 dev_reserve += 1;       /* btree write point */
1465                 dev_reserve += 1;       /* copygc write point */
1466                 dev_reserve += 1;       /* rebalance write point */
1467
1468                 dev_reserve *= ca->mi.bucket_size;
1469
1470                 capacity += bucket_to_sector(ca, ca->mi.nbuckets -
1471                                              ca->mi.first_bucket);
1472
1473                 reserved_sectors += dev_reserve * 2;
1474
1475                 bucket_size_max = max_t(unsigned, bucket_size_max,
1476                                         ca->mi.bucket_size);
1477         }
1478
1479         gc_reserve = c->opts.gc_reserve_bytes
1480                 ? c->opts.gc_reserve_bytes >> 9
1481                 : div64_u64(capacity * c->opts.gc_reserve_percent, 100);
1482
1483         reserved_sectors = max(gc_reserve, reserved_sectors);
1484
1485         reserved_sectors = min(reserved_sectors, capacity);
1486
1487         c->capacity = capacity - reserved_sectors;
1488
1489         c->bucket_size_max = bucket_size_max;
1490
1491         /* Wake up case someone was waiting for buckets */
1492         closure_wake_up(&c->freelist_wait);
1493 }
1494
1495 static bool bch2_dev_has_open_write_point(struct bch_fs *c, struct bch_dev *ca)
1496 {
1497         struct open_bucket *ob;
1498         bool ret = false;
1499
1500         for (ob = c->open_buckets;
1501              ob < c->open_buckets + ARRAY_SIZE(c->open_buckets);
1502              ob++) {
1503                 spin_lock(&ob->lock);
1504                 if (ob->valid && !ob->on_partial_list &&
1505                     ob->dev == ca->dev_idx)
1506                         ret = true;
1507                 spin_unlock(&ob->lock);
1508         }
1509
1510         return ret;
1511 }
1512
1513 /* device goes ro: */
1514 void bch2_dev_allocator_remove(struct bch_fs *c, struct bch_dev *ca)
1515 {
1516         unsigned i;
1517
1518         /* First, remove device from allocation groups: */
1519
1520         for (i = 0; i < ARRAY_SIZE(c->rw_devs); i++)
1521                 clear_bit(ca->dev_idx, c->rw_devs[i].d);
1522
1523         /*
1524          * Capacity is calculated based off of devices in allocation groups:
1525          */
1526         bch2_recalc_capacity(c);
1527
1528         /* Next, close write points that point to this device... */
1529         for (i = 0; i < ARRAY_SIZE(c->write_points); i++)
1530                 bch2_writepoint_stop(c, ca, &c->write_points[i]);
1531
1532         bch2_writepoint_stop(c, ca, &c->copygc_write_point);
1533         bch2_writepoint_stop(c, ca, &c->rebalance_write_point);
1534         bch2_writepoint_stop(c, ca, &c->btree_write_point);
1535
1536         mutex_lock(&c->btree_reserve_cache_lock);
1537         while (c->btree_reserve_cache_nr) {
1538                 struct btree_alloc *a =
1539                         &c->btree_reserve_cache[--c->btree_reserve_cache_nr];
1540
1541                 bch2_open_buckets_put(c, &a->ob);
1542         }
1543         mutex_unlock(&c->btree_reserve_cache_lock);
1544
1545         while (1) {
1546                 struct open_bucket *ob;
1547
1548                 spin_lock(&c->freelist_lock);
1549                 if (!ca->open_buckets_partial_nr) {
1550                         spin_unlock(&c->freelist_lock);
1551                         break;
1552                 }
1553                 ob = c->open_buckets +
1554                         ca->open_buckets_partial[--ca->open_buckets_partial_nr];
1555                 ob->on_partial_list = false;
1556                 spin_unlock(&c->freelist_lock);
1557
1558                 bch2_open_bucket_put(c, ob);
1559         }
1560
1561         bch2_ec_stop_dev(c, ca);
1562
1563         /*
1564          * Wake up threads that were blocked on allocation, so they can notice
1565          * the device can no longer be removed and the capacity has changed:
1566          */
1567         closure_wake_up(&c->freelist_wait);
1568
1569         /*
1570          * journal_res_get() can block waiting for free space in the journal -
1571          * it needs to notice there may not be devices to allocate from anymore:
1572          */
1573         wake_up(&c->journal.wait);
1574
1575         /* Now wait for any in flight writes: */
1576
1577         closure_wait_event(&c->open_buckets_wait,
1578                            !bch2_dev_has_open_write_point(c, ca));
1579 }
1580
1581 /* device goes rw: */
1582 void bch2_dev_allocator_add(struct bch_fs *c, struct bch_dev *ca)
1583 {
1584         unsigned i;
1585
1586         for (i = 0; i < ARRAY_SIZE(c->rw_devs); i++)
1587                 if (ca->mi.data_allowed & (1 << i))
1588                         set_bit(ca->dev_idx, c->rw_devs[i].d);
1589 }
1590
1591 void bch2_fs_allocator_background_init(struct bch_fs *c)
1592 {
1593         spin_lock_init(&c->freelist_lock);
1594         INIT_WORK(&c->discard_work, bch2_do_discards_work);
1595         INIT_WORK(&c->invalidate_work, bch2_do_invalidates_work);
1596 }