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

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 /* erasure coding */
   4
   5 #include "bcachefs.h"
   6 #include "alloc_foreground.h"
   7 #include "bkey_on_stack.h"
   8 #include "bset.h"
   9 #include "btree_gc.h"
  10 #include "btree_update.h"
  11 #include "buckets.h"
  12 #include "disk_groups.h"
  13 #include "ec.h"
  14 #include "error.h"
  15 #include "io.h"
  16 #include "keylist.h"
  17 #include "recovery.h"
  18 #include "super-io.h"
  19 #include "util.h"
  20
  21 #include <linux/sort.h>
  22
  23 #ifdef __KERNEL__
  24
  25 #include <linux/raid/pq.h>
  26 #include <linux/raid/xor.h>
  27
  28 static void raid5_recov(unsigned disks, unsigned failed_idx,
  29                         size_t size, void **data)
  30 {
  31         unsigned i = 2, nr;
  32
  33         BUG_ON(failed_idx >= disks);
  34
  35         swap(data[0], data[failed_idx]);
  36         memcpy(data[0], data[1], size);
  37
  38         while (i < disks) {
  39                 nr = min_t(unsigned, disks - i, MAX_XOR_BLOCKS);
  40                 xor_blocks(nr, size, data[0], data + i);
  41                 i += nr;
  42         }
  43
  44         swap(data[0], data[failed_idx]);
  45 }
  46
  47 static void raid_gen(int nd, int np, size_t size, void **v)
  48 {
  49         if (np >= 1)
  50                 raid5_recov(nd + np, nd, size, v);
  51         if (np >= 2)
  52                 raid6_call.gen_syndrome(nd + np, size, v);
  53         BUG_ON(np > 2);
  54 }
  55
  56 static void raid_rec(int nr, int *ir, int nd, int np, size_t size, void **v)
  57 {
  58         switch (nr) {
  59         case 0:
  60                 break;
  61         case 1:
  62                 if (ir[0] < nd + 1)
  63                         raid5_recov(nd + 1, ir[0], size, v);
  64                 else
  65                         raid6_call.gen_syndrome(nd + np, size, v);
  66                 break;
  67         case 2:
  68                 if (ir[1] < nd) {
  69                         /* data+data failure. */
  70                         raid6_2data_recov(nd + np, size, ir[0], ir[1], v);
  71                 } else if (ir[0] < nd) {
  72                         /* data + p/q failure */
  73
  74                         if (ir[1] == nd) /* data + p failure */
  75                                 raid6_datap_recov(nd + np, size, ir[0], v);
  76                         else { /* data + q failure */
  77                                 raid5_recov(nd + 1, ir[0], size, v);
  78                                 raid6_call.gen_syndrome(nd + np, size, v);
  79                         }
  80                 } else {
  81                         raid_gen(nd, np, size, v);
  82                 }
  83                 break;
  84         default:
  85                 BUG();
  86         }
  87 }
  88
  89 #else
  90
  91 #include <raid/raid.h>
  92
  93 #endif
  94
  95 struct ec_bio {
  96         struct bch_dev          *ca;
  97         struct ec_stripe_buf    *buf;
  98         size_t                  idx;
  99         struct bio              bio;
 100 };
 101
 102 /* Stripes btree keys: */
 103
 104 const char *bch2_stripe_invalid(const struct bch_fs *c, struct bkey_s_c k)
 105 {
 106         const struct bch_stripe *s = bkey_s_c_to_stripe(k).v;
 107
 108         if (k.k->p.inode)
 109                 return "invalid stripe key";
 110
 111         if (bkey_val_bytes(k.k) < sizeof(*s))
 112                 return "incorrect value size";
 113
 114         if (bkey_val_bytes(k.k) < sizeof(*s) ||
 115             bkey_val_u64s(k.k) < stripe_val_u64s(s))
 116                 return "incorrect value size";
 117
 118         return bch2_bkey_ptrs_invalid(c, k);
 119 }
 120
 121 void bch2_stripe_to_text(struct printbuf *out, struct bch_fs *c,
 122                          struct bkey_s_c k)
 123 {
 124         const struct bch_stripe *s = bkey_s_c_to_stripe(k).v;
 125         unsigned i;
 126
 127         pr_buf(out, "algo %u sectors %u blocks %u:%u csum %u gran %u",
 128                s->algorithm,
 129                le16_to_cpu(s->sectors),
 130                s->nr_blocks - s->nr_redundant,
 131                s->nr_redundant,
 132                s->csum_type,
 133                1U << s->csum_granularity_bits);
 134
 135         for (i = 0; i < s->nr_blocks; i++)
 136                 pr_buf(out, " %u:%llu:%u", s->ptrs[i].dev,
 137                        (u64) s->ptrs[i].offset,
 138                        stripe_blockcount_get(s, i));
 139 }
 140
 141 static int ptr_matches_stripe(struct bch_fs *c,
 142                               struct bch_stripe *v,
 143                               const struct bch_extent_ptr *ptr)
 144 {
 145         unsigned i;
 146
 147         for (i = 0; i < v->nr_blocks - v->nr_redundant; i++) {
 148                 const struct bch_extent_ptr *ptr2 = v->ptrs + i;
 149
 150                 if (ptr->dev == ptr2->dev &&
 151                     ptr->gen == ptr2->gen &&
 152                     ptr->offset >= ptr2->offset &&
 153                     ptr->offset <  ptr2->offset + le16_to_cpu(v->sectors))
 154                         return i;
 155         }
 156
 157         return -1;
 158 }
 159
 160 static int extent_matches_stripe(struct bch_fs *c,
 161                                  struct bch_stripe *v,
 162                                  struct bkey_s_c k)
 163 {
 164
 165         switch (k.k->type) {
 166         case KEY_TYPE_extent: {
 167                 struct bkey_s_c_extent e = bkey_s_c_to_extent(k);
 168                 const struct bch_extent_ptr *ptr;
 169                 int idx;
 170
 171                 extent_for_each_ptr(e, ptr) {
 172                         idx = ptr_matches_stripe(c, v, ptr);
 173                         if (idx >= 0)
 174                                 return idx;
 175                 }
 176                 break;
 177         }
 178         }
 179
 180         return -1;
 181 }
 182
 183 static bool extent_has_stripe_ptr(struct bkey_s_c k, u64 idx)
 184 {
 185         switch (k.k->type) {
 186         case KEY_TYPE_extent: {
 187                 struct bkey_s_c_extent e = bkey_s_c_to_extent(k);
 188                 const union bch_extent_entry *entry;
 189
 190                 extent_for_each_entry(e, entry)
 191                         if (extent_entry_type(entry) ==
 192                             BCH_EXTENT_ENTRY_stripe_ptr &&
 193                             entry->stripe_ptr.idx == idx)
 194                                 return true;
 195
 196                 break;
 197         }
 198         }
 199
 200         return false;
 201 }
 202
 203 static void ec_stripe_key_init(struct bch_fs *c,
 204                                struct bkey_i_stripe *s,
 205                                struct open_buckets *blocks,
 206                                struct open_buckets *parity,
 207                                unsigned stripe_size)
 208 {
 209         struct open_bucket *ob;
 210         unsigned i, u64s;
 211
 212         bkey_stripe_init(&s->k_i);
 213         s->v.sectors                    = cpu_to_le16(stripe_size);
 214         s->v.algorithm                  = 0;
 215         s->v.nr_blocks                  = parity->nr + blocks->nr;
 216         s->v.nr_redundant               = parity->nr;
 217         s->v.csum_granularity_bits      = ilog2(c->sb.encoded_extent_max);
 218         s->v.csum_type                  = BCH_CSUM_CRC32C;
 219         s->v.pad                        = 0;
 220
 221         open_bucket_for_each(c, blocks, ob, i)
 222                 s->v.ptrs[i]                    = ob->ptr;
 223
 224         open_bucket_for_each(c, parity, ob, i)
 225                 s->v.ptrs[blocks->nr + i]       = ob->ptr;
 226
 227         while ((u64s = stripe_val_u64s(&s->v)) > BKEY_VAL_U64s_MAX) {
 228                 BUG_ON(1 << s->v.csum_granularity_bits >=
 229                        le16_to_cpu(s->v.sectors) ||
 230                        s->v.csum_granularity_bits == U8_MAX);
 231                 s->v.csum_granularity_bits++;
 232         }
 233
 234         set_bkey_val_u64s(&s->k, u64s);
 235 }
 236
 237 /* Checksumming: */
 238
 239 static void ec_generate_checksums(struct ec_stripe_buf *buf)
 240 {
 241         struct bch_stripe *v = &buf->key.v;
 242         unsigned csum_granularity = 1 << v->csum_granularity_bits;
 243         unsigned csums_per_device = stripe_csums_per_device(v);
 244         unsigned csum_bytes = bch_crc_bytes[v->csum_type];
 245         unsigned i, j;
 246
 247         if (!csum_bytes)
 248                 return;
 249
 250         BUG_ON(buf->offset);
 251         BUG_ON(buf->size != le16_to_cpu(v->sectors));
 252
 253         for (i = 0; i < v->nr_blocks; i++) {
 254                 for (j = 0; j < csums_per_device; j++) {
 255                         unsigned offset = j << v->csum_granularity_bits;
 256                         unsigned len = min(csum_granularity, buf->size - offset);
 257
 258                         struct bch_csum csum =
 259                                 bch2_checksum(NULL, v->csum_type,
 260                                               null_nonce(),
 261                                               buf->data[i] + (offset << 9),
 262                                               len << 9);
 263
 264                         memcpy(stripe_csum(v, i, j), &csum, csum_bytes);
 265                 }
 266         }
 267 }
 268
 269 static void ec_validate_checksums(struct bch_fs *c, struct ec_stripe_buf *buf)
 270 {
 271         struct bch_stripe *v = &buf->key.v;
 272         unsigned csum_granularity = 1 << v->csum_granularity_bits;
 273         unsigned csum_bytes = bch_crc_bytes[v->csum_type];
 274         unsigned i;
 275
 276         if (!csum_bytes)
 277                 return;
 278
 279         for (i = 0; i < v->nr_blocks; i++) {
 280                 unsigned offset = buf->offset;
 281                 unsigned end = buf->offset + buf->size;
 282
 283                 if (!test_bit(i, buf->valid))
 284                         continue;
 285
 286                 while (offset < end) {
 287                         unsigned j = offset >> v->csum_granularity_bits;
 288                         unsigned len = min(csum_granularity, end - offset);
 289                         struct bch_csum csum;
 290
 291                         BUG_ON(offset & (csum_granularity - 1));
 292                         BUG_ON(offset + len != le16_to_cpu(v->sectors) &&
 293                                ((offset + len) & (csum_granularity - 1)));
 294
 295                         csum = bch2_checksum(NULL, v->csum_type,
 296                                              null_nonce(),
 297                                              buf->data[i] + ((offset - buf->offset) << 9),
 298                                              len << 9);
 299
 300                         if (memcmp(stripe_csum(v, i, j), &csum, csum_bytes)) {
 301                                 __bcache_io_error(c,
 302                                         "checksum error while doing reconstruct read (%u:%u)",
 303                                         i, j);
 304                                 clear_bit(i, buf->valid);
 305                                 break;
 306                         }
 307
 308                         offset += len;
 309                 }
 310         }
 311 }
 312
 313 /* Erasure coding: */
 314
 315 static void ec_generate_ec(struct ec_stripe_buf *buf)
 316 {
 317         struct bch_stripe *v = &buf->key.v;
 318         unsigned nr_data = v->nr_blocks - v->nr_redundant;
 319         unsigned bytes = le16_to_cpu(v->sectors) << 9;
 320
 321         raid_gen(nr_data, v->nr_redundant, bytes, buf->data);
 322 }
 323
 324 static unsigned __ec_nr_failed(struct ec_stripe_buf *buf, unsigned nr)
 325 {
 326         return nr - bitmap_weight(buf->valid, nr);
 327 }
 328
 329 static unsigned ec_nr_failed(struct ec_stripe_buf *buf)
 330 {
 331         return __ec_nr_failed(buf, buf->key.v.nr_blocks);
 332 }
 333
 334 static int ec_do_recov(struct bch_fs *c, struct ec_stripe_buf *buf)
 335 {
 336         struct bch_stripe *v = &buf->key.v;
 337         unsigned i, failed[EC_STRIPE_MAX], nr_failed = 0;
 338         unsigned nr_data = v->nr_blocks - v->nr_redundant;
 339         unsigned bytes = buf->size << 9;
 340
 341         if (ec_nr_failed(buf) > v->nr_redundant) {
 342                 __bcache_io_error(c,
 343                         "error doing reconstruct read: unable to read enough blocks");
 344                 return -1;
 345         }
 346
 347         for (i = 0; i < nr_data; i++)
 348                 if (!test_bit(i, buf->valid))
 349                         failed[nr_failed++] = i;
 350
 351         raid_rec(nr_failed, failed, nr_data, v->nr_redundant, bytes, buf->data);
 352         return 0;
 353 }
 354
 355 /* IO: */
 356
 357 static void ec_block_endio(struct bio *bio)
 358 {
 359         struct ec_bio *ec_bio = container_of(bio, struct ec_bio, bio);
 360         struct bch_dev *ca = ec_bio->ca;
 361         struct closure *cl = bio->bi_private;
 362
 363         if (bch2_dev_io_err_on(bio->bi_status, ca, "erasure coding"))
 364                 clear_bit(ec_bio->idx, ec_bio->buf->valid);
 365
 366         bio_put(&ec_bio->bio);
 367         percpu_ref_put(&ca->io_ref);
 368         closure_put(cl);
 369 }
 370
 371 static void ec_block_io(struct bch_fs *c, struct ec_stripe_buf *buf,
 372                         unsigned rw, unsigned idx, struct closure *cl)
 373 {
 374         struct bch_stripe *v = &buf->key.v;
 375         unsigned offset = 0, bytes = buf->size << 9;
 376         struct bch_extent_ptr *ptr = &v->ptrs[idx];
 377         struct bch_dev *ca = bch_dev_bkey_exists(c, ptr->dev);
 378
 379         if (!bch2_dev_get_ioref(ca, rw)) {
 380                 clear_bit(idx, buf->valid);
 381                 return;
 382         }
 383
 384         while (offset < bytes) {
 385                 unsigned nr_iovecs = min_t(size_t, BIO_MAX_PAGES,
 386                                            DIV_ROUND_UP(bytes, PAGE_SIZE));
 387                 unsigned b = min_t(size_t, bytes - offset,
 388                                    nr_iovecs << PAGE_SHIFT);
 389                 struct ec_bio *ec_bio;
 390
 391                 ec_bio = container_of(bio_alloc_bioset(GFP_KERNEL, nr_iovecs,
 392                                                        &c->ec_bioset),
 393                                       struct ec_bio, bio);
 394
 395                 ec_bio->ca                      = ca;
 396                 ec_bio->buf                     = buf;
 397                 ec_bio->idx                     = idx;
 398
 399                 bio_set_dev(&ec_bio->bio, ca->disk_sb.bdev);
 400                 bio_set_op_attrs(&ec_bio->bio, rw, 0);
 401
 402                 ec_bio->bio.bi_iter.bi_sector   = ptr->offset + buf->offset + (offset >> 9);
 403                 ec_bio->bio.bi_end_io           = ec_block_endio;
 404                 ec_bio->bio.bi_private          = cl;
 405
 406                 bch2_bio_map(&ec_bio->bio, buf->data[idx] + offset, b);
 407
 408                 closure_get(cl);
 409                 percpu_ref_get(&ca->io_ref);
 410
 411                 submit_bio(&ec_bio->bio);
 412
 413                 offset += b;
 414         }
 415
 416         percpu_ref_put(&ca->io_ref);
 417 }
 418
 419 /* recovery read path: */
 420 int bch2_ec_read_extent(struct bch_fs *c, struct bch_read_bio *rbio)
 421 {
 422         struct btree_trans trans;
 423         struct btree_iter *iter;
 424         struct ec_stripe_buf *buf;
 425         struct closure cl;
 426         struct bkey_s_c k;
 427         struct bch_stripe *v;
 428         unsigned stripe_idx;
 429         unsigned offset, end;
 430         unsigned i, nr_data, csum_granularity;
 431         int ret = 0, idx;
 432
 433         closure_init_stack(&cl);
 434
 435         BUG_ON(!rbio->pick.has_ec);
 436
 437         stripe_idx = rbio->pick.ec.idx;
 438
 439         buf = kzalloc(sizeof(*buf), GFP_NOIO);
 440         if (!buf)
 441                 return -ENOMEM;
 442
 443         bch2_trans_init(&trans, c, 0, 0);
 444
 445         iter = bch2_trans_get_iter(&trans, BTREE_ID_EC,
 446                                    POS(0, stripe_idx),
 447                                    BTREE_ITER_SLOTS);
 448         k = bch2_btree_iter_peek_slot(iter);
 449         if (bkey_err(k) || k.k->type != KEY_TYPE_stripe) {
 450                 __bcache_io_error(c,
 451                         "error doing reconstruct read: stripe not found");
 452                 kfree(buf);
 453                 return bch2_trans_exit(&trans) ?: -EIO;
 454         }
 455
 456         bkey_reassemble(&buf->key.k_i, k);
 457         bch2_trans_exit(&trans);
 458
 459         v = &buf->key.v;
 460
 461         nr_data = v->nr_blocks - v->nr_redundant;
 462
 463         idx = ptr_matches_stripe(c, v, &rbio->pick.ptr);
 464         BUG_ON(idx < 0);
 465
 466         csum_granularity = 1U << v->csum_granularity_bits;
 467
 468         offset  = rbio->bio.bi_iter.bi_sector - v->ptrs[idx].offset;
 469         end     = offset + bio_sectors(&rbio->bio);
 470
 471         BUG_ON(end > le16_to_cpu(v->sectors));
 472
 473         buf->offset     = round_down(offset, csum_granularity);
 474         buf->size       = min_t(unsigned, le16_to_cpu(v->sectors),
 475                                 round_up(end, csum_granularity)) - buf->offset;
 476
 477         for (i = 0; i < v->nr_blocks; i++) {
 478                 buf->data[i] = kmalloc(buf->size << 9, GFP_NOIO);
 479                 if (!buf->data[i]) {
 480                         ret = -ENOMEM;
 481                         goto err;
 482                 }
 483         }
 484
 485         memset(buf->valid, 0xFF, sizeof(buf->valid));
 486
 487         for (i = 0; i < v->nr_blocks; i++) {
 488                 struct bch_extent_ptr *ptr = v->ptrs + i;
 489                 struct bch_dev *ca = bch_dev_bkey_exists(c, ptr->dev);
 490
 491                 if (ptr_stale(ca, ptr)) {
 492                         __bcache_io_error(c,
 493                                           "error doing reconstruct read: stale pointer");
 494                         clear_bit(i, buf->valid);
 495                         continue;
 496                 }
 497
 498                 ec_block_io(c, buf, REQ_OP_READ, i, &cl);
 499         }
 500
 501         closure_sync(&cl);
 502
 503         if (ec_nr_failed(buf) > v->nr_redundant) {
 504                 __bcache_io_error(c,
 505                         "error doing reconstruct read: unable to read enough blocks");
 506                 ret = -EIO;
 507                 goto err;
 508         }
 509
 510         ec_validate_checksums(c, buf);
 511
 512         ret = ec_do_recov(c, buf);
 513         if (ret)
 514                 goto err;
 515
 516         memcpy_to_bio(&rbio->bio, rbio->bio.bi_iter,
 517                       buf->data[idx] + ((offset - buf->offset) << 9));
 518 err:
 519         for (i = 0; i < v->nr_blocks; i++)
 520                 kfree(buf->data[i]);
 521         kfree(buf);
 522         return ret;
 523 }
 524
 525 /* stripe bucket accounting: */
 526
 527 static int __ec_stripe_mem_alloc(struct bch_fs *c, size_t idx, gfp_t gfp)
 528 {
 529         ec_stripes_heap n, *h = &c->ec_stripes_heap;
 530
 531         if (idx >= h->size) {
 532                 if (!init_heap(&n, max(1024UL, roundup_pow_of_two(idx + 1)), gfp))
 533                         return -ENOMEM;
 534
 535                 spin_lock(&c->ec_stripes_heap_lock);
 536                 if (n.size > h->size) {
 537                         memcpy(n.data, h->data, h->used * sizeof(h->data[0]));
 538                         n.used = h->used;
 539                         swap(*h, n);
 540                 }
 541                 spin_unlock(&c->ec_stripes_heap_lock);
 542
 543                 free_heap(&n);
 544         }
 545
 546         if (!genradix_ptr_alloc(&c->stripes[0], idx, gfp))
 547                 return -ENOMEM;
 548
 549         if (c->gc_pos.phase != GC_PHASE_NOT_RUNNING &&
 550             !genradix_ptr_alloc(&c->stripes[1], idx, gfp))
 551                 return -ENOMEM;
 552
 553         return 0;
 554 }
 555
 556 static int ec_stripe_mem_alloc(struct bch_fs *c,
 557                                struct btree_iter *iter)
 558 {
 559         size_t idx = iter->pos.offset;
 560         int ret = 0;
 561
 562         if (!__ec_stripe_mem_alloc(c, idx, GFP_NOWAIT|__GFP_NOWARN))
 563                 return ret;
 564
 565         bch2_trans_unlock(iter->trans);
 566         ret = -EINTR;
 567
 568         if (!__ec_stripe_mem_alloc(c, idx, GFP_KERNEL))
 569                 return ret;
 570
 571         return -ENOMEM;
 572 }
 573
 574 static ssize_t stripe_idx_to_delete(struct bch_fs *c)
 575 {
 576         ec_stripes_heap *h = &c->ec_stripes_heap;
 577
 578         return h->used && h->data[0].blocks_nonempty == 0
 579                 ? h->data[0].idx : -1;
 580 }
 581
 582 static inline int ec_stripes_heap_cmp(ec_stripes_heap *h,
 583                                       struct ec_stripe_heap_entry l,
 584                                       struct ec_stripe_heap_entry r)
 585 {
 586         return ((l.blocks_nonempty > r.blocks_nonempty) -
 587                 (l.blocks_nonempty < r.blocks_nonempty));
 588 }
 589
 590 static inline void ec_stripes_heap_set_backpointer(ec_stripes_heap *h,
 591                                                    size_t i)
 592 {
 593         struct bch_fs *c = container_of(h, struct bch_fs, ec_stripes_heap);
 594
 595         genradix_ptr(&c->stripes[0], h->data[i].idx)->heap_idx = i;
 596 }
 597
 598 static void heap_verify_backpointer(struct bch_fs *c, size_t idx)
 599 {
 600         ec_stripes_heap *h = &c->ec_stripes_heap;
 601         struct stripe *m = genradix_ptr(&c->stripes[0], idx);
 602
 603         BUG_ON(!m->alive);
 604         BUG_ON(m->heap_idx >= h->used);
 605         BUG_ON(h->data[m->heap_idx].idx != idx);
 606 }
 607
 608 void bch2_stripes_heap_update(struct bch_fs *c,
 609                               struct stripe *m, size_t idx)
 610 {
 611         ec_stripes_heap *h = &c->ec_stripes_heap;
 612         size_t i;
 613
 614         if (m->alive) {
 615                 heap_verify_backpointer(c, idx);
 616
 617                 h->data[m->heap_idx].blocks_nonempty = m->blocks_nonempty;
 618
 619                 i = m->heap_idx;
 620                 heap_sift_up(h,   i, ec_stripes_heap_cmp,
 621                              ec_stripes_heap_set_backpointer);
 622                 heap_sift_down(h, i, ec_stripes_heap_cmp,
 623                                ec_stripes_heap_set_backpointer);
 624
 625                 heap_verify_backpointer(c, idx);
 626         } else {
 627                 bch2_stripes_heap_insert(c, m, idx);
 628         }
 629
 630         if (stripe_idx_to_delete(c) >= 0 &&
 631             !percpu_ref_is_dying(&c->writes))
 632                 schedule_work(&c->ec_stripe_delete_work);
 633 }
 634
 635 void bch2_stripes_heap_del(struct bch_fs *c,
 636                            struct stripe *m, size_t idx)
 637 {
 638         heap_verify_backpointer(c, idx);
 639
 640         m->alive = false;
 641         heap_del(&c->ec_stripes_heap, m->heap_idx,
 642                  ec_stripes_heap_cmp,
 643                  ec_stripes_heap_set_backpointer);
 644 }
 645
 646 void bch2_stripes_heap_insert(struct bch_fs *c,
 647                               struct stripe *m, size_t idx)
 648 {
 649         BUG_ON(heap_full(&c->ec_stripes_heap));
 650
 651         heap_add(&c->ec_stripes_heap, ((struct ec_stripe_heap_entry) {
 652                         .idx = idx,
 653                         .blocks_nonempty = m->blocks_nonempty,
 654                 }),
 655                  ec_stripes_heap_cmp,
 656                  ec_stripes_heap_set_backpointer);
 657         m->alive = true;
 658
 659         heap_verify_backpointer(c, idx);
 660 }
 661
 662 /* stripe deletion */
 663
 664 static int ec_stripe_delete(struct bch_fs *c, size_t idx)
 665 {
 666         return bch2_btree_delete_range(c, BTREE_ID_EC,
 667                                        POS(0, idx),
 668                                        POS(0, idx + 1),
 669                                        NULL);
 670 }
 671
 672 static void ec_stripe_delete_work(struct work_struct *work)
 673 {
 674         struct bch_fs *c =
 675                 container_of(work, struct bch_fs, ec_stripe_delete_work);
 676         ssize_t idx;
 677
 678         down_read(&c->gc_lock);
 679         mutex_lock(&c->ec_stripe_create_lock);
 680
 681         while (1) {
 682                 spin_lock(&c->ec_stripes_heap_lock);
 683                 idx = stripe_idx_to_delete(c);
 684                 spin_unlock(&c->ec_stripes_heap_lock);
 685
 686                 if (idx < 0)
 687                         break;
 688
 689                 if (ec_stripe_delete(c, idx))
 690                         break;
 691         }
 692
 693         mutex_unlock(&c->ec_stripe_create_lock);
 694         up_read(&c->gc_lock);
 695 }
 696
 697 /* stripe creation: */
 698
 699 static int ec_stripe_bkey_insert(struct bch_fs *c,
 700                                  struct bkey_i_stripe *stripe)
 701 {
 702         struct btree_trans trans;
 703         struct btree_iter *iter;
 704         struct bkey_s_c k;
 705         struct bpos start_pos = POS(0, c->ec_stripe_hint);
 706         int ret;
 707
 708         bch2_trans_init(&trans, c, 0, 0);
 709 retry:
 710         bch2_trans_begin(&trans);
 711
 712         for_each_btree_key(&trans, iter, BTREE_ID_EC, start_pos,
 713                            BTREE_ITER_SLOTS|BTREE_ITER_INTENT, k, ret) {
 714                 if (bkey_cmp(k.k->p, POS(0, U32_MAX)) > 0) {
 715                         if (start_pos.offset) {
 716                                 start_pos = POS_MIN;
 717                                 bch2_btree_iter_set_pos(iter, start_pos);
 718                                 continue;
 719                         }
 720
 721                         ret = -ENOSPC;
 722                         break;
 723                 }
 724
 725                 if (bkey_deleted(k.k))
 726                         goto found_slot;
 727         }
 728
 729         goto err;
 730 found_slot:
 731         start_pos = iter->pos;
 732
 733         ret = ec_stripe_mem_alloc(c, iter);
 734         if (ret)
 735                 goto err;
 736
 737         stripe->k.p = iter->pos;
 738
 739         bch2_trans_update(&trans, iter, &stripe->k_i);
 740
 741         ret = bch2_trans_commit(&trans, NULL, NULL,
 742                                 BTREE_INSERT_ATOMIC|
 743                                 BTREE_INSERT_NOFAIL);
 744 err:
 745         if (ret == -EINTR)
 746                 goto retry;
 747
 748         c->ec_stripe_hint = ret ? start_pos.offset : start_pos.offset + 1;
 749         bch2_trans_exit(&trans);
 750
 751         return ret;
 752 }
 753
 754 static void extent_stripe_ptr_add(struct bkey_s_extent e,
 755                                   struct ec_stripe_buf *s,
 756                                   struct bch_extent_ptr *ptr,
 757                                   unsigned block)
 758 {
 759         struct bch_extent_stripe_ptr *dst = (void *) ptr;
 760         union bch_extent_entry *end = extent_entry_last(e);
 761
 762         memmove_u64s_up(dst + 1, dst, (u64 *) end - (u64 *) dst);
 763         e.k->u64s += sizeof(*dst) / sizeof(u64);
 764
 765         *dst = (struct bch_extent_stripe_ptr) {
 766                 .type = 1 << BCH_EXTENT_ENTRY_stripe_ptr,
 767                 .block          = block,
 768                 .idx            = s->key.k.p.offset,
 769         };
 770 }
 771
 772 static int ec_stripe_update_ptrs(struct bch_fs *c,
 773                                  struct ec_stripe_buf *s,
 774                                  struct bkey *pos)
 775 {
 776         struct btree_trans trans;
 777         struct btree_iter *iter;
 778         struct bkey_s_c k;
 779         struct bkey_s_extent e;
 780         struct bkey_on_stack sk;
 781         int ret = 0, dev, idx;
 782
 783         bkey_on_stack_init(&sk);
 784         bch2_trans_init(&trans, c, BTREE_ITER_MAX, 0);
 785
 786         iter = bch2_trans_get_iter(&trans, BTREE_ID_EXTENTS,
 787                                    bkey_start_pos(pos),
 788                                    BTREE_ITER_INTENT);
 789
 790         while ((k = bch2_btree_iter_peek(iter)).k &&
 791                !(ret = bkey_err(k)) &&
 792                bkey_cmp(bkey_start_pos(k.k), pos->p) < 0) {
 793                 struct bch_extent_ptr *ptr, *ec_ptr = NULL;
 794
 795                 if (extent_has_stripe_ptr(k, s->key.k.p.offset)) {
 796                         bch2_btree_iter_next(iter);
 797                         continue;
 798                 }
 799
 800                 idx = extent_matches_stripe(c, &s->key.v, k);
 801                 if (idx < 0) {
 802                         bch2_btree_iter_next(iter);
 803                         continue;
 804                 }
 805
 806                 bch2_btree_iter_set_pos(iter, bkey_start_pos(k.k));
 807
 808                 dev = s->key.v.ptrs[idx].dev;
 809
 810                 bkey_on_stack_reassemble(&sk, c, k);
 811                 e = bkey_i_to_s_extent(sk.k);
 812
 813                 extent_for_each_ptr(e, ptr) {
 814                         if (ptr->dev == dev)
 815                                 ec_ptr = ptr;
 816                         else
 817                                 ptr->cached = true;
 818                 }
 819
 820                 extent_stripe_ptr_add(e, s, ec_ptr, idx);
 821
 822                 bch2_trans_update(&trans, iter, sk.k);
 823
 824                 ret = bch2_trans_commit(&trans, NULL, NULL,
 825                                         BTREE_INSERT_ATOMIC|
 826                                         BTREE_INSERT_NOFAIL|
 827                                         BTREE_INSERT_USE_RESERVE);
 828                 if (ret == -EINTR)
 829                         ret = 0;
 830                 if (ret)
 831                         break;
 832         }
 833
 834         bch2_trans_exit(&trans);
 835         bkey_on_stack_exit(&sk, c);
 836
 837         return ret;
 838 }
 839
 840 /*
 841  * data buckets of new stripe all written: create the stripe
 842  */
 843 static void ec_stripe_create(struct ec_stripe_new *s)
 844 {
 845         struct bch_fs *c = s->c;
 846         struct open_bucket *ob;
 847         struct bkey_i *k;
 848         struct bch_stripe *v = &s->stripe.key.v;
 849         unsigned i, nr_data = v->nr_blocks - v->nr_redundant;
 850         struct closure cl;
 851         int ret;
 852
 853         BUG_ON(s->h->s == s);
 854
 855         closure_init_stack(&cl);
 856
 857         if (s->err) {
 858                 bch_err(c, "error creating stripe: error writing data buckets");
 859                 goto err;
 860         }
 861
 862         if (!percpu_ref_tryget(&c->writes))
 863                 goto err;
 864
 865         BUG_ON(bitmap_weight(s->blocks_allocated,
 866                              s->blocks.nr) != s->blocks.nr);
 867
 868         ec_generate_ec(&s->stripe);
 869
 870         ec_generate_checksums(&s->stripe);
 871
 872         /* write p/q: */
 873         for (i = nr_data; i < v->nr_blocks; i++)
 874                 ec_block_io(c, &s->stripe, REQ_OP_WRITE, i, &cl);
 875
 876         closure_sync(&cl);
 877
 878         for (i = nr_data; i < v->nr_blocks; i++)
 879                 if (!test_bit(i, s->stripe.valid)) {
 880                         bch_err(c, "error creating stripe: error writing redundancy buckets");
 881                         goto err_put_writes;
 882                 }
 883
 884         mutex_lock(&c->ec_stripe_create_lock);
 885
 886         ret = ec_stripe_bkey_insert(c, &s->stripe.key);
 887         if (ret) {
 888                 bch_err(c, "error creating stripe: error creating stripe key");
 889                 goto err_unlock;
 890         }
 891
 892         for_each_keylist_key(&s->keys, k) {
 893                 ret = ec_stripe_update_ptrs(c, &s->stripe, &k->k);
 894                 if (ret)
 895                         break;
 896         }
 897
 898 err_unlock:
 899         mutex_unlock(&c->ec_stripe_create_lock);
 900 err_put_writes:
 901         percpu_ref_put(&c->writes);
 902 err:
 903         open_bucket_for_each(c, &s->blocks, ob, i) {
 904                 ob->ec = NULL;
 905                 __bch2_open_bucket_put(c, ob);
 906         }
 907
 908         bch2_open_buckets_put(c, &s->parity);
 909
 910         bch2_keylist_free(&s->keys, s->inline_keys);
 911
 912         mutex_lock(&s->h->lock);
 913         list_del(&s->list);
 914         mutex_unlock(&s->h->lock);
 915
 916         for (i = 0; i < s->stripe.key.v.nr_blocks; i++)
 917                 kvpfree(s->stripe.data[i], s->stripe.size << 9);
 918         kfree(s);
 919 }
 920
 921 static struct ec_stripe_new *ec_stripe_set_pending(struct ec_stripe_head *h)
 922 {
 923         struct ec_stripe_new *s = h->s;
 924
 925         list_add(&s->list, &h->stripes);
 926         h->s = NULL;
 927
 928         return s;
 929 }
 930
 931 static void ec_stripe_new_put(struct ec_stripe_new *s)
 932 {
 933         BUG_ON(atomic_read(&s->pin) <= 0);
 934         if (atomic_dec_and_test(&s->pin))
 935                 ec_stripe_create(s);
 936 }
 937
 938 /* have a full bucket - hand it off to be erasure coded: */
 939 void bch2_ec_bucket_written(struct bch_fs *c, struct open_bucket *ob)
 940 {
 941         struct ec_stripe_new *s = ob->ec;
 942
 943         if (ob->sectors_free)
 944                 s->err = -1;
 945
 946         ec_stripe_new_put(s);
 947 }
 948
 949 void bch2_ec_bucket_cancel(struct bch_fs *c, struct open_bucket *ob)
 950 {
 951         struct ec_stripe_new *s = ob->ec;
 952
 953         s->err = -EIO;
 954 }
 955
 956 void *bch2_writepoint_ec_buf(struct bch_fs *c, struct write_point *wp)
 957 {
 958         struct open_bucket *ob = ec_open_bucket(c, &wp->ptrs);
 959         struct bch_dev *ca;
 960         unsigned offset;
 961
 962         if (!ob)
 963                 return NULL;
 964
 965         ca      = bch_dev_bkey_exists(c, ob->ptr.dev);
 966         offset  = ca->mi.bucket_size - ob->sectors_free;
 967
 968         return ob->ec->stripe.data[ob->ec_idx] + (offset << 9);
 969 }
 970
 971 void bch2_ec_add_backpointer(struct bch_fs *c, struct write_point *wp,
 972                              struct bpos pos, unsigned sectors)
 973 {
 974         struct open_bucket *ob = ec_open_bucket(c, &wp->ptrs);
 975         struct ec_stripe_new *ec;
 976
 977         if (!ob)
 978                 return;
 979
 980         ec = ob->ec;
 981         mutex_lock(&ec->lock);
 982
 983         if (bch2_keylist_realloc(&ec->keys, ec->inline_keys,
 984                                  ARRAY_SIZE(ec->inline_keys),
 985                                  BKEY_U64s)) {
 986                 BUG();
 987         }
 988
 989         bkey_init(&ec->keys.top->k);
 990         ec->keys.top->k.p       = pos;
 991         bch2_key_resize(&ec->keys.top->k, sectors);
 992         bch2_keylist_push(&ec->keys);
 993
 994         mutex_unlock(&ec->lock);
 995 }
 996
 997 static int unsigned_cmp(const void *_l, const void *_r)
 998 {
 999         unsigned l = *((const unsigned *) _l);
1000         unsigned r = *((const unsigned *) _r);
1001
1002         return cmp_int(l, r);
1003 }
1004
1005 /* pick most common bucket size: */
1006 static unsigned pick_blocksize(struct bch_fs *c,
1007                                struct bch_devs_mask *devs)
1008 {
1009         struct bch_dev *ca;
1010         unsigned i, nr = 0, sizes[BCH_SB_MEMBERS_MAX];
1011         struct {
1012                 unsigned nr, size;
1013         } cur = { 0, 0 }, best = { 0, 0 };
1014
1015         for_each_member_device_rcu(ca, c, i, devs)
1016                 sizes[nr++] = ca->mi.bucket_size;
1017
1018         sort(sizes, nr, sizeof(unsigned), unsigned_cmp, NULL);
1019
1020         for (i = 0; i < nr; i++) {
1021                 if (sizes[i] != cur.size) {
1022                         if (cur.nr > best.nr)
1023                                 best = cur;
1024
1025                         cur.nr = 0;
1026                         cur.size = sizes[i];
1027                 }
1028
1029                 cur.nr++;
1030         }
1031
1032         if (cur.nr > best.nr)
1033                 best = cur;
1034
1035         return best.size;
1036 }
1037
1038 int bch2_ec_stripe_new_alloc(struct bch_fs *c, struct ec_stripe_head *h)
1039 {
1040         struct ec_stripe_new *s;
1041         unsigned i;
1042
1043         BUG_ON(h->parity.nr != h->redundancy);
1044         BUG_ON(!h->blocks.nr);
1045         BUG_ON(h->parity.nr + h->blocks.nr > EC_STRIPE_MAX);
1046         lockdep_assert_held(&h->lock);
1047
1048         s = kzalloc(sizeof(*s), GFP_KERNEL);
1049         if (!s)
1050                 return -ENOMEM;
1051
1052         mutex_init(&s->lock);
1053         atomic_set(&s->pin, 1);
1054         s->c            = c;
1055         s->h            = h;
1056         s->blocks       = h->blocks;
1057         s->parity       = h->parity;
1058
1059         memset(&h->blocks, 0, sizeof(h->blocks));
1060         memset(&h->parity, 0, sizeof(h->parity));
1061
1062         bch2_keylist_init(&s->keys, s->inline_keys);
1063
1064         s->stripe.offset        = 0;
1065         s->stripe.size          = h->blocksize;
1066         memset(s->stripe.valid, 0xFF, sizeof(s->stripe.valid));
1067
1068         ec_stripe_key_init(c, &s->stripe.key,
1069                            &s->blocks, &s->parity,
1070                            h->blocksize);
1071
1072         for (i = 0; i < s->stripe.key.v.nr_blocks; i++) {
1073                 s->stripe.data[i] = kvpmalloc(s->stripe.size << 9, GFP_KERNEL);
1074                 if (!s->stripe.data[i])
1075                         goto err;
1076         }
1077
1078         h->s = s;
1079
1080         return 0;
1081 err:
1082         for (i = 0; i < s->stripe.key.v.nr_blocks; i++)
1083                 kvpfree(s->stripe.data[i], s->stripe.size << 9);
1084         kfree(s);
1085         return -ENOMEM;
1086 }
1087
1088 static struct ec_stripe_head *
1089 ec_new_stripe_head_alloc(struct bch_fs *c, unsigned target,
1090                          unsigned algo, unsigned redundancy)
1091 {
1092         struct ec_stripe_head *h;
1093         struct bch_dev *ca;
1094         unsigned i;
1095
1096         h = kzalloc(sizeof(*h), GFP_KERNEL);
1097         if (!h)
1098                 return NULL;
1099
1100         mutex_init(&h->lock);
1101         mutex_lock(&h->lock);
1102         INIT_LIST_HEAD(&h->stripes);
1103
1104         h->target       = target;
1105         h->algo         = algo;
1106         h->redundancy   = redundancy;
1107
1108         rcu_read_lock();
1109         h->devs = target_rw_devs(c, BCH_DATA_USER, target);
1110
1111         for_each_member_device_rcu(ca, c, i, &h->devs)
1112                 if (!ca->mi.durability)
1113                         __clear_bit(i, h->devs.d);
1114
1115         h->blocksize = pick_blocksize(c, &h->devs);
1116
1117         for_each_member_device_rcu(ca, c, i, &h->devs)
1118                 if (ca->mi.bucket_size == h->blocksize)
1119                         h->nr_active_devs++;
1120
1121         rcu_read_unlock();
1122         list_add(&h->list, &c->ec_new_stripe_list);
1123         return h;
1124 }
1125
1126 void bch2_ec_stripe_head_put(struct ec_stripe_head *h)
1127 {
1128         struct ec_stripe_new *s = NULL;
1129
1130         if (h->s &&
1131             bitmap_weight(h->s->blocks_allocated,
1132                           h->s->blocks.nr) == h->s->blocks.nr)
1133                 s = ec_stripe_set_pending(h);
1134
1135         mutex_unlock(&h->lock);
1136
1137         if (s)
1138                 ec_stripe_new_put(s);
1139 }
1140
1141 struct ec_stripe_head *bch2_ec_stripe_head_get(struct bch_fs *c,
1142                                                unsigned target,
1143                                                unsigned algo,
1144                                                unsigned redundancy)
1145 {
1146         struct ec_stripe_head *h;
1147
1148         if (!redundancy)
1149                 return NULL;
1150
1151         mutex_lock(&c->ec_new_stripe_lock);
1152         list_for_each_entry(h, &c->ec_new_stripe_list, list)
1153                 if (h->target           == target &&
1154                     h->algo             == algo &&
1155                     h->redundancy       == redundancy) {
1156                         mutex_lock(&h->lock);
1157                         goto found;
1158                 }
1159
1160         h = ec_new_stripe_head_alloc(c, target, algo, redundancy);
1161 found:
1162         mutex_unlock(&c->ec_new_stripe_lock);
1163         return h;
1164 }
1165
1166 void bch2_ec_stop_dev(struct bch_fs *c, struct bch_dev *ca)
1167 {
1168         struct ec_stripe_head *h;
1169         struct open_bucket *ob;
1170         unsigned i;
1171
1172         mutex_lock(&c->ec_new_stripe_lock);
1173         list_for_each_entry(h, &c->ec_new_stripe_list, list) {
1174                 struct ec_stripe_new *s = NULL;
1175
1176                 mutex_lock(&h->lock);
1177                 bch2_open_buckets_stop_dev(c, ca, &h->blocks);
1178                 bch2_open_buckets_stop_dev(c, ca, &h->parity);
1179
1180                 if (!h->s)
1181                         goto unlock;
1182
1183                 open_bucket_for_each(c, &h->s->blocks, ob, i)
1184                         if (ob->ptr.dev == ca->dev_idx)
1185                                 goto found;
1186                 open_bucket_for_each(c, &h->s->parity, ob, i)
1187                         if (ob->ptr.dev == ca->dev_idx)
1188                                 goto found;
1189                 goto unlock;
1190 found:
1191                 h->s->err = -1;
1192                 s = ec_stripe_set_pending(h);
1193 unlock:
1194                 mutex_unlock(&h->lock);
1195
1196                 if (s)
1197                         ec_stripe_new_put(s);
1198         }
1199         mutex_unlock(&c->ec_new_stripe_lock);
1200 }
1201
1202 static int __bch2_stripe_write_key(struct btree_trans *trans,
1203                                    struct btree_iter *iter,
1204                                    struct stripe *m,
1205                                    size_t idx,
1206                                    struct bkey_i_stripe *new_key,
1207                                    unsigned flags)
1208 {
1209         struct bch_fs *c = trans->c;
1210         struct bkey_s_c k;
1211         unsigned i;
1212         int ret;
1213
1214         bch2_btree_iter_set_pos(iter, POS(0, idx));
1215
1216         k = bch2_btree_iter_peek_slot(iter);
1217         ret = bkey_err(k);
1218         if (ret)
1219                 return ret;
1220
1221         if (k.k->type != KEY_TYPE_stripe)
1222                 return -EIO;
1223
1224         bkey_reassemble(&new_key->k_i, k);
1225
1226         spin_lock(&c->ec_stripes_heap_lock);
1227
1228         for (i = 0; i < new_key->v.nr_blocks; i++)
1229                 stripe_blockcount_set(&new_key->v, i,
1230                                       m->block_sectors[i]);
1231         m->dirty = false;
1232
1233         spin_unlock(&c->ec_stripes_heap_lock);
1234
1235         bch2_trans_update(trans, iter, &new_key->k_i);
1236
1237         return bch2_trans_commit(trans, NULL, NULL,
1238                                  BTREE_INSERT_NOFAIL|flags);
1239 }
1240
1241 int bch2_stripes_write(struct bch_fs *c, unsigned flags, bool *wrote)
1242 {
1243         struct btree_trans trans;
1244         struct btree_iter *iter;
1245         struct genradix_iter giter;
1246         struct bkey_i_stripe *new_key;
1247         struct stripe *m;
1248         int ret = 0;
1249
1250         new_key = kmalloc(255 * sizeof(u64), GFP_KERNEL);
1251         BUG_ON(!new_key);
1252
1253         bch2_trans_init(&trans, c, 0, 0);
1254
1255         iter = bch2_trans_get_iter(&trans, BTREE_ID_EC, POS_MIN,
1256                                    BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
1257
1258         genradix_for_each(&c->stripes[0], giter, m) {
1259                 if (!m->dirty)
1260                         continue;
1261
1262                 ret = __bch2_stripe_write_key(&trans, iter, m, giter.pos,
1263                                               new_key, flags);
1264                 if (ret)
1265                         break;
1266
1267                 *wrote = true;
1268         }
1269
1270         bch2_trans_exit(&trans);
1271
1272         kfree(new_key);
1273
1274         return ret;
1275 }
1276
1277 int bch2_stripes_read(struct bch_fs *c, struct journal_keys *journal_keys)
1278 {
1279         struct btree_trans trans;
1280         struct btree_iter *btree_iter;
1281         struct journal_iter journal_iter;
1282         struct bkey_s_c btree_k, journal_k;
1283         int ret;
1284
1285         ret = bch2_fs_ec_start(c);
1286         if (ret)
1287                 return ret;
1288
1289         bch2_trans_init(&trans, c, 0, 0);
1290
1291         btree_iter      = bch2_trans_get_iter(&trans, BTREE_ID_EC, POS_MIN, 0);
1292         journal_iter    = bch2_journal_iter_init(journal_keys, BTREE_ID_EC);
1293
1294         btree_k         = bch2_btree_iter_peek(btree_iter);
1295         journal_k       = bch2_journal_iter_peek(&journal_iter);
1296
1297         while (1) {
1298                 bool btree;
1299
1300                 if (btree_k.k && journal_k.k) {
1301                         int cmp = bkey_cmp(btree_k.k->p, journal_k.k->p);
1302
1303                         if (!cmp)
1304                                 btree_k = bch2_btree_iter_next(btree_iter);
1305                         btree = cmp < 0;
1306                 } else if (btree_k.k) {
1307                         btree = true;
1308                 } else if (journal_k.k) {
1309                         btree = false;
1310                 } else {
1311                         break;
1312                 }
1313
1314                 bch2_mark_key(c, btree ? btree_k : journal_k,
1315                               0, 0, NULL, 0,
1316                               BCH_BUCKET_MARK_ALLOC_READ|
1317                               BCH_BUCKET_MARK_NOATOMIC);
1318
1319                 if (btree)
1320                         btree_k = bch2_btree_iter_next(btree_iter);
1321                 else
1322                         journal_k = bch2_journal_iter_next(&journal_iter);
1323         }
1324
1325         ret = bch2_trans_exit(&trans) ?: ret;
1326         if (ret) {
1327                 bch_err(c, "error reading stripes: %i", ret);
1328                 return ret;
1329         }
1330
1331         return 0;
1332 }
1333
1334 int bch2_ec_mem_alloc(struct bch_fs *c, bool gc)
1335 {
1336         struct btree_trans trans;
1337         struct btree_iter *iter;
1338         struct bkey_s_c k;
1339         size_t i, idx = 0;
1340         int ret = 0;
1341
1342         bch2_trans_init(&trans, c, 0, 0);
1343
1344         iter = bch2_trans_get_iter(&trans, BTREE_ID_EC, POS(0, U64_MAX), 0);
1345
1346         k = bch2_btree_iter_prev(iter);
1347         if (!IS_ERR_OR_NULL(k.k))
1348                 idx = k.k->p.offset + 1;
1349         ret = bch2_trans_exit(&trans);
1350         if (ret)
1351                 return ret;
1352
1353         if (!idx)
1354                 return 0;
1355
1356         if (!gc &&
1357             !init_heap(&c->ec_stripes_heap, roundup_pow_of_two(idx),
1358                        GFP_KERNEL))
1359                 return -ENOMEM;
1360 #if 0
1361         ret = genradix_prealloc(&c->stripes[gc], idx, GFP_KERNEL);
1362 #else
1363         for (i = 0; i < idx; i++)
1364                 if (!genradix_ptr_alloc(&c->stripes[gc], i, GFP_KERNEL))
1365                         return -ENOMEM;
1366 #endif
1367         return 0;
1368 }
1369
1370 int bch2_fs_ec_start(struct bch_fs *c)
1371 {
1372         return bch2_ec_mem_alloc(c, false);
1373 }
1374
1375 void bch2_fs_ec_exit(struct bch_fs *c)
1376 {
1377         struct ec_stripe_head *h;
1378
1379         while (1) {
1380                 mutex_lock(&c->ec_new_stripe_lock);
1381                 h = list_first_entry_or_null(&c->ec_new_stripe_list,
1382                                              struct ec_stripe_head, list);
1383                 if (h)
1384                         list_del(&h->list);
1385                 mutex_unlock(&c->ec_new_stripe_lock);
1386                 if (!h)
1387                         break;
1388
1389                 BUG_ON(h->s);
1390                 BUG_ON(!list_empty(&h->stripes));
1391                 kfree(h);
1392         }
1393
1394         free_heap(&c->ec_stripes_heap);
1395         genradix_free(&c->stripes[0]);
1396         bioset_exit(&c->ec_bioset);
1397 }
1398
1399 int bch2_fs_ec_init(struct bch_fs *c)
1400 {
1401         INIT_WORK(&c->ec_stripe_delete_work, ec_stripe_delete_work);
1402
1403         return bioset_init(&c->ec_bioset, 1, offsetof(struct ec_bio, bio),
1404                            BIOSET_NEED_BVECS);
1405 }