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

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include "bcachefs.h"
   4 #include "alloc_foreground.h"
   5 #include "bkey_on_stack.h"
   6 #include "btree_gc.h"
   7 #include "btree_update.h"
   8 #include "btree_update_interior.h"
   9 #include "buckets.h"
  10 #include "disk_groups.h"
  11 #include "inode.h"
  12 #include "io.h"
  13 #include "journal_reclaim.h"
  14 #include "move.h"
  15 #include "replicas.h"
  16 #include "super-io.h"
  17 #include "keylist.h"
  18
  19 #include <linux/ioprio.h>
  20 #include <linux/kthread.h>
  21
  22 #include <trace/events/bcachefs.h>
  23
  24 #define SECTORS_IN_FLIGHT_PER_DEVICE    2048
  25
  26 struct moving_io {
  27         struct list_head        list;
  28         struct closure          cl;
  29         bool                    read_completed;
  30
  31         unsigned                read_sectors;
  32         unsigned                write_sectors;
  33
  34         struct bch_read_bio     rbio;
  35
  36         struct migrate_write    write;
  37         /* Must be last since it is variable size */
  38         struct bio_vec          bi_inline_vecs[0];
  39 };
  40
  41 struct moving_context {
  42         /* Closure for waiting on all reads and writes to complete */
  43         struct closure          cl;
  44
  45         struct bch_move_stats   *stats;
  46
  47         struct list_head        reads;
  48
  49         /* in flight sectors: */
  50         atomic_t                read_sectors;
  51         atomic_t                write_sectors;
  52
  53         wait_queue_head_t       wait;
  54 };
  55
  56 static int bch2_migrate_index_update(struct bch_write_op *op)
  57 {
  58         struct bch_fs *c = op->c;
  59         struct btree_trans trans;
  60         struct btree_iter *iter;
  61         struct migrate_write *m =
  62                 container_of(op, struct migrate_write, op);
  63         struct keylist *keys = &op->insert_keys;
  64         int ret = 0;
  65
  66         bch2_trans_init(&trans, c, BTREE_ITER_MAX, 0);
  67
  68         iter = bch2_trans_get_iter(&trans, m->btree_id,
  69                                    bkey_start_pos(&bch2_keylist_front(keys)->k),
  70                                    BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
  71
  72         while (1) {
  73                 struct bkey_s_c k;
  74                 struct bkey_i *insert;
  75                 struct bkey_i_extent *new;
  76                 BKEY_PADDED(k) _new, _insert;
  77                 const union bch_extent_entry *entry;
  78                 struct extent_ptr_decoded p;
  79                 bool did_work = false;
  80                 int nr;
  81
  82                 bch2_trans_reset(&trans, 0);
  83
  84                 k = bch2_btree_iter_peek_slot(iter);
  85                 ret = bkey_err(k);
  86                 if (ret) {
  87                         if (ret == -EINTR)
  88                                 continue;
  89                         break;
  90                 }
  91
  92                 new = bkey_i_to_extent(bch2_keylist_front(keys));
  93
  94                 if (bversion_cmp(k.k->version, new->k.version) ||
  95                     !bch2_bkey_matches_ptr(c, k, m->ptr, m->offset))
  96                         goto nomatch;
  97
  98                 if (m->data_cmd == DATA_REWRITE &&
  99                     !bch2_bkey_has_device(k, m->data_opts.rewrite_dev))
 100                         goto nomatch;
 101
 102                 bkey_reassemble(&_insert.k, k);
 103                 insert = &_insert.k;
 104
 105                 bkey_copy(&_new.k, bch2_keylist_front(keys));
 106                 new = bkey_i_to_extent(&_new.k);
 107                 bch2_cut_front(iter->pos, &new->k_i);
 108
 109                 bch2_cut_front(iter->pos,       insert);
 110                 bch2_cut_back(new->k.p,         insert);
 111                 bch2_cut_back(insert->k.p,      &new->k_i);
 112
 113                 if (m->data_cmd == DATA_REWRITE)
 114                         bch2_bkey_drop_device(bkey_i_to_s(insert),
 115                                               m->data_opts.rewrite_dev);
 116
 117                 extent_for_each_ptr_decode(extent_i_to_s(new), p, entry) {
 118                         if (bch2_bkey_has_device(bkey_i_to_s_c(insert), p.ptr.dev)) {
 119                                 /*
 120                                  * raced with another move op? extent already
 121                                  * has a pointer to the device we just wrote
 122                                  * data to
 123                                  */
 124                                 continue;
 125                         }
 126
 127                         bch2_extent_ptr_decoded_append(insert, &p);
 128                         did_work = true;
 129                 }
 130
 131                 if (!did_work)
 132                         goto nomatch;
 133
 134                 bch2_bkey_narrow_crcs(insert,
 135                                 (struct bch_extent_crc_unpacked) { 0 });
 136                 bch2_extent_normalize(c, bkey_i_to_s(insert));
 137                 bch2_bkey_mark_replicas_cached(c, bkey_i_to_s(insert),
 138                                                op->opts.background_target,
 139                                                op->opts.data_replicas);
 140
 141                 /*
 142                  * If we're not fully overwriting @k, and it's compressed, we
 143                  * need a reservation for all the pointers in @insert
 144                  */
 145                 nr = bch2_bkey_nr_ptrs_allocated(bkey_i_to_s_c(insert)) -
 146                          m->nr_ptrs_reserved;
 147
 148                 if (insert->k.size < k.k->size &&
 149                     bch2_bkey_sectors_compressed(k) &&
 150                     nr > 0) {
 151                         ret = bch2_disk_reservation_add(c, &op->res,
 152                                         keylist_sectors(keys) * nr, 0);
 153                         if (ret)
 154                                 goto out;
 155
 156                         m->nr_ptrs_reserved += nr;
 157                         goto next;
 158                 }
 159
 160                 bch2_trans_update(&trans, iter, insert, 0);
 161
 162                 ret = bch2_trans_commit(&trans, &op->res,
 163                                 op_journal_seq(op),
 164                                 BTREE_INSERT_NOFAIL|
 165                                 BTREE_INSERT_USE_RESERVE|
 166                                 m->data_opts.btree_insert_flags);
 167                 if (!ret)
 168                         atomic_long_inc(&c->extent_migrate_done);
 169                 if (ret == -EINTR)
 170                         ret = 0;
 171                 if (ret)
 172                         break;
 173 next:
 174                 while (bkey_cmp(iter->pos, bch2_keylist_front(keys)->k.p) >= 0) {
 175                         bch2_keylist_pop_front(keys);
 176                         if (bch2_keylist_empty(keys))
 177                                 goto out;
 178                 }
 179                 continue;
 180 nomatch:
 181                 if (m->ctxt) {
 182                         BUG_ON(k.k->p.offset <= iter->pos.offset);
 183                         atomic64_inc(&m->ctxt->stats->keys_raced);
 184                         atomic64_add(k.k->p.offset - iter->pos.offset,
 185                                      &m->ctxt->stats->sectors_raced);
 186                 }
 187                 atomic_long_inc(&c->extent_migrate_raced);
 188                 trace_move_race(&new->k);
 189                 bch2_btree_iter_next_slot(iter);
 190                 goto next;
 191         }
 192 out:
 193         bch2_trans_exit(&trans);
 194         BUG_ON(ret == -EINTR);
 195         return ret;
 196 }
 197
 198 void bch2_migrate_read_done(struct migrate_write *m, struct bch_read_bio *rbio)
 199 {
 200         /* write bio must own pages: */
 201         BUG_ON(!m->op.wbio.bio.bi_vcnt);
 202
 203         m->ptr          = rbio->pick.ptr;
 204         m->offset       = rbio->pos.offset - rbio->pick.crc.offset;
 205         m->op.devs_have = rbio->devs_have;
 206         m->op.pos       = rbio->pos;
 207         m->op.version   = rbio->version;
 208         m->op.crc       = rbio->pick.crc;
 209         m->op.wbio.bio.bi_iter.bi_size = m->op.crc.compressed_size << 9;
 210
 211         if (bch2_csum_type_is_encryption(m->op.crc.csum_type)) {
 212                 m->op.nonce     = m->op.crc.nonce + m->op.crc.offset;
 213                 m->op.csum_type = m->op.crc.csum_type;
 214         }
 215
 216         if (m->data_cmd == DATA_REWRITE)
 217                 bch2_dev_list_drop_dev(&m->op.devs_have, m->data_opts.rewrite_dev);
 218 }
 219
 220 int bch2_migrate_write_init(struct bch_fs *c, struct migrate_write *m,
 221                             struct write_point_specifier wp,
 222                             struct bch_io_opts io_opts,
 223                             enum data_cmd data_cmd,
 224                             struct data_opts data_opts,
 225                             enum btree_id btree_id,
 226                             struct bkey_s_c k)
 227 {
 228         struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
 229         const union bch_extent_entry *entry;
 230         struct extent_ptr_decoded p;
 231         int ret;
 232
 233         m->btree_id     = btree_id;
 234         m->data_cmd     = data_cmd;
 235         m->data_opts    = data_opts;
 236         m->nr_ptrs_reserved = 0;
 237
 238         bch2_write_op_init(&m->op, c, io_opts);
 239
 240         if (!bch2_bkey_is_incompressible(k))
 241                 m->op.compression_type =
 242                         bch2_compression_opt_to_type[io_opts.background_compression ?:
 243                                                      io_opts.compression];
 244         else
 245                 m->op.incompressible = true;
 246
 247         m->op.target    = data_opts.target,
 248         m->op.write_point = wp;
 249
 250         if (m->data_opts.btree_insert_flags & BTREE_INSERT_USE_RESERVE)
 251                 m->op.alloc_reserve = RESERVE_MOVINGGC;
 252
 253         m->op.flags |= BCH_WRITE_ONLY_SPECIFIED_DEVS|
 254                 BCH_WRITE_PAGES_STABLE|
 255                 BCH_WRITE_PAGES_OWNED|
 256                 BCH_WRITE_DATA_ENCODED|
 257                 BCH_WRITE_FROM_INTERNAL;
 258
 259         m->op.nr_replicas       = 1;
 260         m->op.nr_replicas_required = 1;
 261         m->op.index_update_fn   = bch2_migrate_index_update;
 262
 263         switch (data_cmd) {
 264         case DATA_ADD_REPLICAS: {
 265                 /*
 266                  * DATA_ADD_REPLICAS is used for moving data to a different
 267                  * device in the background, and due to compression the new copy
 268                  * might take up more space than the old copy:
 269                  */
 270 #if 0
 271                 int nr = (int) io_opts.data_replicas -
 272                         bch2_bkey_nr_ptrs_allocated(k);
 273 #endif
 274                 int nr = (int) io_opts.data_replicas;
 275
 276                 if (nr > 0) {
 277                         m->op.nr_replicas = m->nr_ptrs_reserved = nr;
 278
 279                         ret = bch2_disk_reservation_get(c, &m->op.res,
 280                                         k.k->size, m->op.nr_replicas, 0);
 281                         if (ret)
 282                                 return ret;
 283                 }
 284                 break;
 285         }
 286         case DATA_REWRITE: {
 287                 unsigned compressed_sectors = 0;
 288
 289                 bkey_for_each_ptr_decode(k.k, ptrs, p, entry)
 290                         if (!p.ptr.cached &&
 291                             crc_is_compressed(p.crc) &&
 292                             bch2_dev_in_target(c, p.ptr.dev, data_opts.target))
 293                                 compressed_sectors += p.crc.compressed_size;
 294
 295                 if (compressed_sectors) {
 296                         ret = bch2_disk_reservation_add(c, &m->op.res,
 297                                         compressed_sectors,
 298                                         BCH_DISK_RESERVATION_NOFAIL);
 299                         if (ret)
 300                                 return ret;
 301                 }
 302                 break;
 303         }
 304         case DATA_PROMOTE:
 305                 m->op.flags     |= BCH_WRITE_ALLOC_NOWAIT;
 306                 m->op.flags     |= BCH_WRITE_CACHED;
 307                 break;
 308         default:
 309                 BUG();
 310         }
 311
 312         return 0;
 313 }
 314
 315 static void move_free(struct closure *cl)
 316 {
 317         struct moving_io *io = container_of(cl, struct moving_io, cl);
 318         struct moving_context *ctxt = io->write.ctxt;
 319         struct bvec_iter_all iter;
 320         struct bio_vec *bv;
 321
 322         bch2_disk_reservation_put(io->write.op.c, &io->write.op.res);
 323
 324         bio_for_each_segment_all(bv, &io->write.op.wbio.bio, iter)
 325                 if (bv->bv_page)
 326                         __free_page(bv->bv_page);
 327
 328         wake_up(&ctxt->wait);
 329
 330         kfree(io);
 331 }
 332
 333 static void move_write_done(struct closure *cl)
 334 {
 335         struct moving_io *io = container_of(cl, struct moving_io, cl);
 336
 337         atomic_sub(io->write_sectors, &io->write.ctxt->write_sectors);
 338         closure_return_with_destructor(cl, move_free);
 339 }
 340
 341 static void move_write(struct closure *cl)
 342 {
 343         struct moving_io *io = container_of(cl, struct moving_io, cl);
 344
 345         if (unlikely(io->rbio.bio.bi_status || io->rbio.hole)) {
 346                 closure_return_with_destructor(cl, move_free);
 347                 return;
 348         }
 349
 350         bch2_migrate_read_done(&io->write, &io->rbio);
 351
 352         atomic_add(io->write_sectors, &io->write.ctxt->write_sectors);
 353         closure_call(&io->write.op.cl, bch2_write, NULL, cl);
 354         continue_at(cl, move_write_done, NULL);
 355 }
 356
 357 static inline struct moving_io *next_pending_write(struct moving_context *ctxt)
 358 {
 359         struct moving_io *io =
 360                 list_first_entry_or_null(&ctxt->reads, struct moving_io, list);
 361
 362         return io && io->read_completed ? io : NULL;
 363 }
 364
 365 static void move_read_endio(struct bio *bio)
 366 {
 367         struct moving_io *io = container_of(bio, struct moving_io, rbio.bio);
 368         struct moving_context *ctxt = io->write.ctxt;
 369
 370         atomic_sub(io->read_sectors, &ctxt->read_sectors);
 371         io->read_completed = true;
 372
 373         if (next_pending_write(ctxt))
 374                 wake_up(&ctxt->wait);
 375
 376         closure_put(&ctxt->cl);
 377 }
 378
 379 static void do_pending_writes(struct moving_context *ctxt)
 380 {
 381         struct moving_io *io;
 382
 383         while ((io = next_pending_write(ctxt))) {
 384                 list_del(&io->list);
 385                 closure_call(&io->cl, move_write, NULL, &ctxt->cl);
 386         }
 387 }
 388
 389 #define move_ctxt_wait_event(_ctxt, _cond)                      \
 390 do {                                                            \
 391         do_pending_writes(_ctxt);                               \
 392                                                                 \
 393         if (_cond)                                              \
 394                 break;                                          \
 395         __wait_event((_ctxt)->wait,                             \
 396                      next_pending_write(_ctxt) || (_cond));     \
 397 } while (1)
 398
 399 static void bch2_move_ctxt_wait_for_io(struct moving_context *ctxt)
 400 {
 401         unsigned sectors_pending = atomic_read(&ctxt->write_sectors);
 402
 403         move_ctxt_wait_event(ctxt,
 404                 !atomic_read(&ctxt->write_sectors) ||
 405                 atomic_read(&ctxt->write_sectors) != sectors_pending);
 406 }
 407
 408 static int bch2_move_extent(struct bch_fs *c,
 409                             struct moving_context *ctxt,
 410                             struct write_point_specifier wp,
 411                             struct bch_io_opts io_opts,
 412                             enum btree_id btree_id,
 413                             struct bkey_s_c k,
 414                             enum data_cmd data_cmd,
 415                             struct data_opts data_opts)
 416 {
 417         struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
 418         struct moving_io *io;
 419         const union bch_extent_entry *entry;
 420         struct extent_ptr_decoded p;
 421         unsigned sectors = k.k->size, pages;
 422         int ret = -ENOMEM;
 423
 424         move_ctxt_wait_event(ctxt,
 425                 atomic_read(&ctxt->write_sectors) <
 426                 SECTORS_IN_FLIGHT_PER_DEVICE);
 427
 428         move_ctxt_wait_event(ctxt,
 429                 atomic_read(&ctxt->read_sectors) <
 430                 SECTORS_IN_FLIGHT_PER_DEVICE);
 431
 432         /* write path might have to decompress data: */
 433         bkey_for_each_ptr_decode(k.k, ptrs, p, entry)
 434                 sectors = max_t(unsigned, sectors, p.crc.uncompressed_size);
 435
 436         pages = DIV_ROUND_UP(sectors, PAGE_SECTORS);
 437         io = kzalloc(sizeof(struct moving_io) +
 438                      sizeof(struct bio_vec) * pages, GFP_KERNEL);
 439         if (!io)
 440                 goto err;
 441
 442         io->write.ctxt          = ctxt;
 443         io->read_sectors        = k.k->size;
 444         io->write_sectors       = k.k->size;
 445
 446         bio_init(&io->write.op.wbio.bio, io->bi_inline_vecs, pages);
 447         bio_set_prio(&io->write.op.wbio.bio,
 448                      IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0));
 449
 450         if (bch2_bio_alloc_pages(&io->write.op.wbio.bio, sectors << 9,
 451                                  GFP_KERNEL))
 452                 goto err_free;
 453
 454         io->rbio.c              = c;
 455         io->rbio.opts           = io_opts;
 456         bio_init(&io->rbio.bio, io->bi_inline_vecs, pages);
 457         io->rbio.bio.bi_vcnt = pages;
 458         bio_set_prio(&io->rbio.bio, IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0));
 459         io->rbio.bio.bi_iter.bi_size = sectors << 9;
 460
 461         bio_set_op_attrs(&io->rbio.bio, REQ_OP_READ, 0);
 462         io->rbio.bio.bi_iter.bi_sector  = bkey_start_offset(k.k);
 463         io->rbio.bio.bi_end_io          = move_read_endio;
 464
 465         ret = bch2_migrate_write_init(c, &io->write, wp, io_opts,
 466                                       data_cmd, data_opts, btree_id, k);
 467         if (ret)
 468                 goto err_free_pages;
 469
 470         atomic64_inc(&ctxt->stats->keys_moved);
 471         atomic64_add(k.k->size, &ctxt->stats->sectors_moved);
 472
 473         trace_move_extent(k.k);
 474
 475         atomic_add(io->read_sectors, &ctxt->read_sectors);
 476         list_add_tail(&io->list, &ctxt->reads);
 477
 478         /*
 479          * dropped by move_read_endio() - guards against use after free of
 480          * ctxt when doing wakeup
 481          */
 482         closure_get(&ctxt->cl);
 483         bch2_read_extent(c, &io->rbio, k, 0,
 484                          BCH_READ_NODECODE|
 485                          BCH_READ_LAST_FRAGMENT);
 486         return 0;
 487 err_free_pages:
 488         bio_free_pages(&io->write.op.wbio.bio);
 489 err_free:
 490         kfree(io);
 491 err:
 492         trace_move_alloc_fail(k.k);
 493         return ret;
 494 }
 495
 496 static int __bch2_move_data(struct bch_fs *c,
 497                 struct moving_context *ctxt,
 498                 struct bch_ratelimit *rate,
 499                 struct write_point_specifier wp,
 500                 struct bpos start,
 501                 struct bpos end,
 502                 move_pred_fn pred, void *arg,
 503                 struct bch_move_stats *stats,
 504                 enum btree_id btree_id)
 505 {
 506         bool kthread = (current->flags & PF_KTHREAD) != 0;
 507         struct bch_io_opts io_opts = bch2_opts_to_inode_opts(c->opts);
 508         struct bkey_on_stack sk;
 509         struct btree_trans trans;
 510         struct btree_iter *iter;
 511         struct bkey_s_c k;
 512         struct data_opts data_opts;
 513         enum data_cmd data_cmd;
 514         u64 delay, cur_inum = U64_MAX;
 515         int ret = 0, ret2;
 516
 517         bkey_on_stack_init(&sk);
 518         bch2_trans_init(&trans, c, 0, 0);
 519
 520         stats->data_type = BCH_DATA_USER;
 521         stats->btree_id = btree_id;
 522         stats->pos      = POS_MIN;
 523
 524         iter = bch2_trans_get_iter(&trans, btree_id, start,
 525                                    BTREE_ITER_PREFETCH);
 526
 527         if (rate)
 528                 bch2_ratelimit_reset(rate);
 529
 530         while (1) {
 531                 do {
 532                         delay = rate ? bch2_ratelimit_delay(rate) : 0;
 533
 534                         if (delay) {
 535                                 bch2_trans_unlock(&trans);
 536                                 set_current_state(TASK_INTERRUPTIBLE);
 537                         }
 538
 539                         if (kthread && (ret = kthread_should_stop())) {
 540                                 __set_current_state(TASK_RUNNING);
 541                                 goto out;
 542                         }
 543
 544                         if (delay)
 545                                 schedule_timeout(delay);
 546
 547                         if (unlikely(freezing(current))) {
 548                                 bch2_trans_unlock(&trans);
 549                                 move_ctxt_wait_event(ctxt, list_empty(&ctxt->reads));
 550                                 try_to_freeze();
 551                         }
 552                 } while (delay);
 553 peek:
 554                 k = bch2_btree_iter_peek(iter);
 555
 556                 stats->pos = iter->pos;
 557
 558                 if (!k.k)
 559                         break;
 560                 ret = bkey_err(k);
 561                 if (ret)
 562                         break;
 563                 if (bkey_cmp(bkey_start_pos(k.k), end) >= 0)
 564                         break;
 565
 566                 if (!bkey_extent_is_direct_data(k.k))
 567                         goto next_nondata;
 568
 569                 if (btree_id == BTREE_ID_EXTENTS &&
 570                     cur_inum != k.k->p.inode) {
 571                         struct bch_inode_unpacked inode;
 572
 573                         /* don't hold btree locks while looking up inode: */
 574                         bch2_trans_unlock(&trans);
 575
 576                         io_opts = bch2_opts_to_inode_opts(c->opts);
 577                         if (!bch2_inode_find_by_inum(c, k.k->p.inode, &inode))
 578                                 bch2_io_opts_apply(&io_opts, bch2_inode_opts_get(&inode));
 579                         cur_inum = k.k->p.inode;
 580                         goto peek;
 581                 }
 582
 583                 switch ((data_cmd = pred(c, arg, k, &io_opts, &data_opts))) {
 584                 case DATA_SKIP:
 585                         goto next;
 586                 case DATA_SCRUB:
 587                         BUG();
 588                 case DATA_ADD_REPLICAS:
 589                 case DATA_REWRITE:
 590                 case DATA_PROMOTE:
 591                         break;
 592                 default:
 593                         BUG();
 594                 }
 595
 596                 /* unlock before doing IO: */
 597                 bkey_on_stack_reassemble(&sk, c, k);
 598                 k = bkey_i_to_s_c(sk.k);
 599                 bch2_trans_unlock(&trans);
 600
 601                 ret2 = bch2_move_extent(c, ctxt, wp, io_opts, btree_id, k,
 602                                         data_cmd, data_opts);
 603                 if (ret2) {
 604                         if (ret2 == -ENOMEM) {
 605                                 /* memory allocation failure, wait for some IO to finish */
 606                                 bch2_move_ctxt_wait_for_io(ctxt);
 607                                 continue;
 608                         }
 609
 610                         /* XXX signal failure */
 611                         goto next;
 612                 }
 613
 614                 if (rate)
 615                         bch2_ratelimit_increment(rate, k.k->size);
 616 next:
 617                 atomic64_add(k.k->size * bch2_bkey_nr_ptrs_allocated(k),
 618                              &stats->sectors_seen);
 619 next_nondata:
 620                 bch2_btree_iter_next(iter);
 621                 bch2_trans_cond_resched(&trans);
 622         }
 623 out:
 624         ret = bch2_trans_exit(&trans) ?: ret;
 625         bkey_on_stack_exit(&sk, c);
 626
 627         return ret;
 628 }
 629
 630 int bch2_move_data(struct bch_fs *c,
 631                    struct bch_ratelimit *rate,
 632                    struct write_point_specifier wp,
 633                    struct bpos start,
 634                    struct bpos end,
 635                    move_pred_fn pred, void *arg,
 636                    struct bch_move_stats *stats)
 637 {
 638         struct moving_context ctxt = { .stats = stats };
 639         int ret;
 640
 641         closure_init_stack(&ctxt.cl);
 642         INIT_LIST_HEAD(&ctxt.reads);
 643         init_waitqueue_head(&ctxt.wait);
 644
 645         stats->data_type = BCH_DATA_USER;
 646
 647         ret =   __bch2_move_data(c, &ctxt, rate, wp, start, end,
 648                                  pred, arg, stats, BTREE_ID_EXTENTS) ?:
 649                 __bch2_move_data(c, &ctxt, rate, wp, start, end,
 650                                  pred, arg, stats, BTREE_ID_REFLINK);
 651
 652         move_ctxt_wait_event(&ctxt, list_empty(&ctxt.reads));
 653         closure_sync(&ctxt.cl);
 654
 655         EBUG_ON(atomic_read(&ctxt.write_sectors));
 656
 657         trace_move_data(c,
 658                         atomic64_read(&stats->sectors_moved),
 659                         atomic64_read(&stats->keys_moved));
 660
 661         return ret;
 662 }
 663
 664 static int bch2_move_btree(struct bch_fs *c,
 665                            move_pred_fn pred,
 666                            void *arg,
 667                            struct bch_move_stats *stats)
 668 {
 669         struct bch_io_opts io_opts = bch2_opts_to_inode_opts(c->opts);
 670         struct btree_trans trans;
 671         struct btree_iter *iter;
 672         struct btree *b;
 673         unsigned id;
 674         struct data_opts data_opts;
 675         enum data_cmd cmd;
 676         int ret = 0;
 677
 678         bch2_trans_init(&trans, c, 0, 0);
 679
 680         stats->data_type = BCH_DATA_BTREE;
 681
 682         for (id = 0; id < BTREE_ID_NR; id++) {
 683                 stats->btree_id = id;
 684
 685                 for_each_btree_node(&trans, iter, id, POS_MIN,
 686                                     BTREE_ITER_PREFETCH, b) {
 687                         stats->pos = iter->pos;
 688
 689                         switch ((cmd = pred(c, arg,
 690                                             bkey_i_to_s_c(&b->key),
 691                                             &io_opts, &data_opts))) {
 692                         case DATA_SKIP:
 693                                 goto next;
 694                         case DATA_SCRUB:
 695                                 BUG();
 696                         case DATA_ADD_REPLICAS:
 697                         case DATA_REWRITE:
 698                                 break;
 699                         default:
 700                                 BUG();
 701                         }
 702
 703                         ret = bch2_btree_node_rewrite(c, iter,
 704                                         b->data->keys.seq, 0) ?: ret;
 705 next:
 706                         bch2_trans_cond_resched(&trans);
 707                 }
 708
 709                 ret = bch2_trans_iter_free(&trans, iter) ?: ret;
 710         }
 711
 712         bch2_trans_exit(&trans);
 713
 714         return ret;
 715 }
 716
 717 #if 0
 718 static enum data_cmd scrub_pred(struct bch_fs *c, void *arg,
 719                                 struct bkey_s_c k,
 720                                 struct bch_io_opts *io_opts,
 721                                 struct data_opts *data_opts)
 722 {
 723         return DATA_SCRUB;
 724 }
 725 #endif
 726
 727 static enum data_cmd rereplicate_pred(struct bch_fs *c, void *arg,
 728                                       struct bkey_s_c k,
 729                                       struct bch_io_opts *io_opts,
 730                                       struct data_opts *data_opts)
 731 {
 732         unsigned nr_good = bch2_bkey_durability(c, k);
 733         unsigned replicas = 0;
 734
 735         switch (k.k->type) {
 736         case KEY_TYPE_btree_ptr:
 737                 replicas = c->opts.metadata_replicas;
 738                 break;
 739         case KEY_TYPE_extent:
 740                 replicas = io_opts->data_replicas;
 741                 break;
 742         }
 743
 744         if (!nr_good || nr_good >= replicas)
 745                 return DATA_SKIP;
 746
 747         data_opts->target               = 0;
 748         data_opts->btree_insert_flags   = 0;
 749         return DATA_ADD_REPLICAS;
 750 }
 751
 752 static enum data_cmd migrate_pred(struct bch_fs *c, void *arg,
 753                                   struct bkey_s_c k,
 754                                   struct bch_io_opts *io_opts,
 755                                   struct data_opts *data_opts)
 756 {
 757         struct bch_ioctl_data *op = arg;
 758
 759         if (!bch2_bkey_has_device(k, op->migrate.dev))
 760                 return DATA_SKIP;
 761
 762         data_opts->target               = 0;
 763         data_opts->btree_insert_flags   = 0;
 764         data_opts->rewrite_dev          = op->migrate.dev;
 765         return DATA_REWRITE;
 766 }
 767
 768 int bch2_data_job(struct bch_fs *c,
 769                   struct bch_move_stats *stats,
 770                   struct bch_ioctl_data op)
 771 {
 772         int ret = 0;
 773
 774         switch (op.op) {
 775         case BCH_DATA_OP_REREPLICATE:
 776                 stats->data_type = BCH_DATA_JOURNAL;
 777                 ret = bch2_journal_flush_device_pins(&c->journal, -1);
 778
 779                 ret = bch2_move_btree(c, rereplicate_pred, c, stats) ?: ret;
 780
 781                 closure_wait_event(&c->btree_interior_update_wait,
 782                                    !bch2_btree_interior_updates_nr_pending(c));
 783
 784                 ret = bch2_replicas_gc2(c) ?: ret;
 785
 786                 ret = bch2_move_data(c, NULL,
 787                                      writepoint_hashed((unsigned long) current),
 788                                      op.start,
 789                                      op.end,
 790                                      rereplicate_pred, c, stats) ?: ret;
 791                 ret = bch2_replicas_gc2(c) ?: ret;
 792                 break;
 793         case BCH_DATA_OP_MIGRATE:
 794                 if (op.migrate.dev >= c->sb.nr_devices)
 795                         return -EINVAL;
 796
 797                 stats->data_type = BCH_DATA_JOURNAL;
 798                 ret = bch2_journal_flush_device_pins(&c->journal, op.migrate.dev);
 799
 800                 ret = bch2_move_btree(c, migrate_pred, &op, stats) ?: ret;
 801                 ret = bch2_replicas_gc2(c) ?: ret;
 802
 803                 ret = bch2_move_data(c, NULL,
 804                                      writepoint_hashed((unsigned long) current),
 805                                      op.start,
 806                                      op.end,
 807                                      migrate_pred, &op, stats) ?: ret;
 808                 ret = bch2_replicas_gc2(c) ?: ret;
 809                 break;
 810         default:
 811                 ret = -EINVAL;
 812         }
 813
 814         return ret;
 815 }