fs/bcachefs/io_misc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * io_misc.c - fallocate, fpunch, truncate:
   4  */
   5
   6 #include "bcachefs.h"
   7 #include "alloc_foreground.h"
   8 #include "bkey_buf.h"
   9 #include "btree_update.h"
  10 #include "buckets.h"
  11 #include "clock.h"
  12 #include "error.h"
  13 #include "extents.h"
  14 #include "extent_update.h"
  15 #include "inode.h"
  16 #include "io_misc.h"
  17 #include "io_write.h"
  18 #include "logged_ops.h"
  19 #include "rebalance.h"
  20 #include "subvolume.h"
  21
  22 /* Overwrites whatever was present with zeroes: */
  23 int bch2_extent_fallocate(struct btree_trans *trans,
  24                           subvol_inum inum,
  25                           struct btree_iter *iter,
  26                           u64 sectors,
  27                           struct bch_io_opts opts,
  28                           s64 *i_sectors_delta,
  29                           struct write_point_specifier write_point)
  30 {
  31         struct bch_fs *c = trans->c;
  32         struct disk_reservation disk_res = { 0 };
  33         struct closure cl;
  34         struct open_buckets open_buckets = { 0 };
  35         struct bkey_s_c k;
  36         struct bkey_buf old, new;
  37         unsigned sectors_allocated = 0, new_replicas;
  38         bool unwritten = opts.nocow &&
  39             c->sb.version >= bcachefs_metadata_version_unwritten_extents;
  40         int ret;
  41
  42         bch2_bkey_buf_init(&old);
  43         bch2_bkey_buf_init(&new);
  44         closure_init_stack(&cl);
  45
  46         k = bch2_btree_iter_peek_slot(iter);
  47         ret = bkey_err(k);
  48         if (ret)
  49                 return ret;
  50
  51         sectors = min_t(u64, sectors, k.k->p.offset - iter->pos.offset);
  52         new_replicas = max(0, (int) opts.data_replicas -
  53                            (int) bch2_bkey_nr_ptrs_fully_allocated(k));
  54
  55         /*
  56          * Get a disk reservation before (in the nocow case) calling
  57          * into the allocator:
  58          */
  59         ret = bch2_disk_reservation_get(c, &disk_res, sectors, new_replicas, 0);
  60         if (unlikely(ret))
  61                 goto err_noprint;
  62
  63         bch2_bkey_buf_reassemble(&old, c, k);
  64
  65         if (!unwritten) {
  66                 struct bkey_i_reservation *reservation;
  67
  68                 bch2_bkey_buf_realloc(&new, c, sizeof(*reservation) / sizeof(u64));
  69                 reservation = bkey_reservation_init(new.k);
  70                 reservation->k.p = iter->pos;
  71                 bch2_key_resize(&reservation->k, sectors);
  72                 reservation->v.nr_replicas = opts.data_replicas;
  73         } else {
  74                 struct bkey_i_extent *e;
  75                 struct bch_devs_list devs_have;
  76                 struct write_point *wp;
  77
  78                 devs_have.nr = 0;
  79
  80                 bch2_bkey_buf_realloc(&new, c, BKEY_EXTENT_U64s_MAX);
  81
  82                 e = bkey_extent_init(new.k);
  83                 e->k.p = iter->pos;
  84
  85                 ret = bch2_alloc_sectors_start_trans(trans,
  86                                 opts.foreground_target,
  87                                 false,
  88                                 write_point,
  89                                 &devs_have,
  90                                 opts.data_replicas,
  91                                 opts.data_replicas,
  92                                 BCH_WATERMARK_normal, 0, &cl, &wp);
  93                 if (bch2_err_matches(ret, BCH_ERR_operation_blocked))
  94                         ret = -BCH_ERR_transaction_restart_nested;
  95                 if (ret)
  96                         goto err;
  97
  98                 sectors = min_t(u64, sectors, wp->sectors_free);
  99                 sectors_allocated = sectors;
 100
 101                 bch2_key_resize(&e->k, sectors);
 102
 103                 bch2_open_bucket_get(c, wp, &open_buckets);
 104                 bch2_alloc_sectors_append_ptrs(c, wp, &e->k_i, sectors, false);
 105                 bch2_alloc_sectors_done(c, wp);
 106
 107                 extent_for_each_ptr(extent_i_to_s(e), ptr)
 108                         ptr->unwritten = true;
 109         }
 110
 111         ret = bch2_extent_update(trans, inum, iter, new.k, &disk_res,
 112                                  0, i_sectors_delta, true);
 113 err:
 114         if (!ret && sectors_allocated)
 115                 bch2_increment_clock(c, sectors_allocated, WRITE);
 116         if (should_print_err(ret))
 117                 bch_err_inum_offset_ratelimited(c,
 118                         inum.inum,
 119                         iter->pos.offset << 9,
 120                         "%s(): error: %s", __func__, bch2_err_str(ret));
 121 err_noprint:
 122         bch2_open_buckets_put(c, &open_buckets);
 123         bch2_disk_reservation_put(c, &disk_res);
 124         bch2_bkey_buf_exit(&new, c);
 125         bch2_bkey_buf_exit(&old, c);
 126
 127         if (closure_nr_remaining(&cl) != 1) {
 128                 bch2_trans_unlock_long(trans);
 129                 bch2_wait_on_allocator(c, &cl);
 130         }
 131
 132         return ret;
 133 }
 134
 135 /*
 136  * Returns -BCH_ERR_transacton_restart if we had to drop locks:
 137  */
 138 int bch2_fpunch_at(struct btree_trans *trans, struct btree_iter *iter,
 139                    subvol_inum inum, u64 end,
 140                    s64 *i_sectors_delta)
 141 {
 142         struct bch_fs *c        = trans->c;
 143         unsigned max_sectors    = KEY_SIZE_MAX & (~0 << c->block_bits);
 144         struct bpos end_pos = POS(inum.inum, end);
 145         struct bkey_s_c k;
 146         int ret = 0, ret2 = 0;
 147         u32 snapshot;
 148
 149         while (!ret ||
 150                bch2_err_matches(ret, BCH_ERR_transaction_restart)) {
 151                 struct disk_reservation disk_res =
 152                         bch2_disk_reservation_init(c, 0);
 153                 struct bkey_i delete;
 154
 155                 if (ret)
 156                         ret2 = ret;
 157
 158                 bch2_trans_begin(trans);
 159
 160                 ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
 161                 if (ret)
 162                         continue;
 163
 164                 bch2_btree_iter_set_snapshot(iter, snapshot);
 165
 166                 /*
 167                  * peek_upto() doesn't have ideal semantics for extents:
 168                  */
 169                 k = bch2_btree_iter_peek_upto(iter, end_pos);
 170                 if (!k.k)
 171                         break;
 172
 173                 ret = bkey_err(k);
 174                 if (ret)
 175                         continue;
 176
 177                 bkey_init(&delete.k);
 178                 delete.k.p = iter->pos;
 179
 180                 /* create the biggest key we can */
 181                 bch2_key_resize(&delete.k, max_sectors);
 182                 bch2_cut_back(end_pos, &delete);
 183
 184                 ret = bch2_extent_update(trans, inum, iter, &delete,
 185                                 &disk_res, 0, i_sectors_delta, false);
 186                 bch2_disk_reservation_put(c, &disk_res);
 187         }
 188
 189         return ret ?: ret2;
 190 }
 191
 192 int bch2_fpunch(struct bch_fs *c, subvol_inum inum, u64 start, u64 end,
 193                 s64 *i_sectors_delta)
 194 {
 195         struct btree_trans *trans = bch2_trans_get(c);
 196         struct btree_iter iter;
 197         int ret;
 198
 199         bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
 200                              POS(inum.inum, start),
 201                              BTREE_ITER_intent);
 202
 203         ret = bch2_fpunch_at(trans, &iter, inum, end, i_sectors_delta);
 204
 205         bch2_trans_iter_exit(trans, &iter);
 206         bch2_trans_put(trans);
 207
 208         if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
 209                 ret = 0;
 210
 211         return ret;
 212 }
 213
 214 /* truncate: */
 215
 216 void bch2_logged_op_truncate_to_text(struct printbuf *out, struct bch_fs *c, struct bkey_s_c k)
 217 {
 218         struct bkey_s_c_logged_op_truncate op = bkey_s_c_to_logged_op_truncate(k);
 219
 220         prt_printf(out, "subvol=%u", le32_to_cpu(op.v->subvol));
 221         prt_printf(out, " inum=%llu", le64_to_cpu(op.v->inum));
 222         prt_printf(out, " new_i_size=%llu", le64_to_cpu(op.v->new_i_size));
 223 }
 224
 225 static int truncate_set_isize(struct btree_trans *trans,
 226                               subvol_inum inum,
 227                               u64 new_i_size,
 228                               bool warn)
 229 {
 230         struct btree_iter iter = { NULL };
 231         struct bch_inode_unpacked inode_u;
 232         int ret;
 233
 234         ret   = __bch2_inode_peek(trans, &iter, &inode_u, inum, BTREE_ITER_intent, warn) ?:
 235                 (inode_u.bi_size = new_i_size, 0) ?:
 236                 bch2_inode_write(trans, &iter, &inode_u);
 237
 238         bch2_trans_iter_exit(trans, &iter);
 239         return ret;
 240 }
 241
 242 static int __bch2_resume_logged_op_truncate(struct btree_trans *trans,
 243                                             struct bkey_i *op_k,
 244                                             u64 *i_sectors_delta)
 245 {
 246         struct bch_fs *c = trans->c;
 247         struct btree_iter fpunch_iter;
 248         struct bkey_i_logged_op_truncate *op = bkey_i_to_logged_op_truncate(op_k);
 249         subvol_inum inum = { le32_to_cpu(op->v.subvol), le64_to_cpu(op->v.inum) };
 250         u64 new_i_size = le64_to_cpu(op->v.new_i_size);
 251         bool warn_errors = i_sectors_delta != NULL;
 252         int ret;
 253
 254         ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
 255                         truncate_set_isize(trans, inum, new_i_size, i_sectors_delta != NULL));
 256         if (ret)
 257                 goto err;
 258
 259         bch2_trans_iter_init(trans, &fpunch_iter, BTREE_ID_extents,
 260                              POS(inum.inum, round_up(new_i_size, block_bytes(c)) >> 9),
 261                              BTREE_ITER_intent);
 262         ret = bch2_fpunch_at(trans, &fpunch_iter, inum, U64_MAX, i_sectors_delta);
 263         bch2_trans_iter_exit(trans, &fpunch_iter);
 264
 265         if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
 266                 ret = 0;
 267 err:
 268         if (warn_errors)
 269                 bch_err_fn(c, ret);
 270         return ret;
 271 }
 272
 273 int bch2_resume_logged_op_truncate(struct btree_trans *trans, struct bkey_i *op_k)
 274 {
 275         return __bch2_resume_logged_op_truncate(trans, op_k, NULL);
 276 }
 277
 278 int bch2_truncate(struct bch_fs *c, subvol_inum inum, u64 new_i_size, u64 *i_sectors_delta)
 279 {
 280         struct bkey_i_logged_op_truncate op;
 281
 282         bkey_logged_op_truncate_init(&op.k_i);
 283         op.v.subvol     = cpu_to_le32(inum.subvol);
 284         op.v.inum       = cpu_to_le64(inum.inum);
 285         op.v.new_i_size = cpu_to_le64(new_i_size);
 286
 287         /*
 288          * Logged ops aren't atomic w.r.t. snapshot creation: creating a
 289          * snapshot while they're in progress, then crashing, will result in the
 290          * resume only proceeding in one of the snapshots
 291          */
 292         down_read(&c->snapshot_create_lock);
 293         struct btree_trans *trans = bch2_trans_get(c);
 294         int ret = bch2_logged_op_start(trans, &op.k_i);
 295         if (ret)
 296                 goto out;
 297         ret = __bch2_resume_logged_op_truncate(trans, &op.k_i, i_sectors_delta);
 298         ret = bch2_logged_op_finish(trans, &op.k_i) ?: ret;
 299 out:
 300         bch2_trans_put(trans);
 301         up_read(&c->snapshot_create_lock);
 302
 303         return ret;
 304 }
 305
 306 /* finsert/fcollapse: */
 307
 308 void bch2_logged_op_finsert_to_text(struct printbuf *out, struct bch_fs *c, struct bkey_s_c k)
 309 {
 310         struct bkey_s_c_logged_op_finsert op = bkey_s_c_to_logged_op_finsert(k);
 311
 312         prt_printf(out, "subvol=%u",            le32_to_cpu(op.v->subvol));
 313         prt_printf(out, " inum=%llu",           le64_to_cpu(op.v->inum));
 314         prt_printf(out, " dst_offset=%lli",     le64_to_cpu(op.v->dst_offset));
 315         prt_printf(out, " src_offset=%llu",     le64_to_cpu(op.v->src_offset));
 316 }
 317
 318 static int adjust_i_size(struct btree_trans *trans, subvol_inum inum,
 319                          u64 offset, s64 len, bool warn)
 320 {
 321         struct btree_iter iter;
 322         struct bch_inode_unpacked inode_u;
 323         int ret;
 324
 325         offset  <<= 9;
 326         len     <<= 9;
 327
 328         ret = __bch2_inode_peek(trans, &iter, &inode_u, inum, BTREE_ITER_intent, warn);
 329         if (ret)
 330                 return ret;
 331
 332         if (len > 0) {
 333                 if (MAX_LFS_FILESIZE - inode_u.bi_size < len) {
 334                         ret = -EFBIG;
 335                         goto err;
 336                 }
 337
 338                 if (offset >= inode_u.bi_size) {
 339                         ret = -EINVAL;
 340                         goto err;
 341                 }
 342         }
 343
 344         inode_u.bi_size += len;
 345         inode_u.bi_mtime = inode_u.bi_ctime = bch2_current_time(trans->c);
 346
 347         ret = bch2_inode_write(trans, &iter, &inode_u);
 348 err:
 349         bch2_trans_iter_exit(trans, &iter);
 350         return ret;
 351 }
 352
 353 static int __bch2_resume_logged_op_finsert(struct btree_trans *trans,
 354                                            struct bkey_i *op_k,
 355                                            u64 *i_sectors_delta)
 356 {
 357         struct bch_fs *c = trans->c;
 358         struct btree_iter iter;
 359         struct bkey_i_logged_op_finsert *op = bkey_i_to_logged_op_finsert(op_k);
 360         subvol_inum inum = { le32_to_cpu(op->v.subvol), le64_to_cpu(op->v.inum) };
 361         struct bch_io_opts opts;
 362         u64 dst_offset = le64_to_cpu(op->v.dst_offset);
 363         u64 src_offset = le64_to_cpu(op->v.src_offset);
 364         s64 shift = dst_offset - src_offset;
 365         u64 len = abs(shift);
 366         u64 pos = le64_to_cpu(op->v.pos);
 367         bool insert = shift > 0;
 368         u32 snapshot;
 369         bool warn_errors = i_sectors_delta != NULL;
 370         int ret = 0;
 371
 372         ret = bch2_inum_opts_get(trans, inum, &opts);
 373         if (ret)
 374                 return ret;
 375
 376         /*
 377          * check for missing subvolume before fpunch, as in resume we don't want
 378          * it to be a fatal error
 379          */
 380         ret = lockrestart_do(trans, __bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot, warn_errors));
 381         if (ret)
 382                 return ret;
 383
 384         bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
 385                              POS(inum.inum, 0),
 386                              BTREE_ITER_intent);
 387
 388         switch (op->v.state) {
 389 case LOGGED_OP_FINSERT_start:
 390         op->v.state = LOGGED_OP_FINSERT_shift_extents;
 391
 392         if (insert) {
 393                 ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
 394                                 adjust_i_size(trans, inum, src_offset, len, warn_errors) ?:
 395                                 bch2_logged_op_update(trans, &op->k_i));
 396                 if (ret)
 397                         goto err;
 398         } else {
 399                 bch2_btree_iter_set_pos(&iter, POS(inum.inum, src_offset));
 400
 401                 ret = bch2_fpunch_at(trans, &iter, inum, src_offset + len, i_sectors_delta);
 402                 if (ret && !bch2_err_matches(ret, BCH_ERR_transaction_restart))
 403                         goto err;
 404
 405                 ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
 406                                 bch2_logged_op_update(trans, &op->k_i));
 407         }
 408
 409         fallthrough;
 410 case LOGGED_OP_FINSERT_shift_extents:
 411         while (1) {
 412                 struct disk_reservation disk_res =
 413                         bch2_disk_reservation_init(c, 0);
 414                 struct bkey_i delete, *copy;
 415                 struct bkey_s_c k;
 416                 struct bpos src_pos = POS(inum.inum, src_offset);
 417
 418                 bch2_trans_begin(trans);
 419
 420                 ret = __bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot,
 421                                                     warn_errors);
 422                 if (ret)
 423                         goto btree_err;
 424
 425                 bch2_btree_iter_set_snapshot(&iter, snapshot);
 426                 bch2_btree_iter_set_pos(&iter, SPOS(inum.inum, pos, snapshot));
 427
 428                 k = insert
 429                         ? bch2_btree_iter_peek_prev(&iter)
 430                         : bch2_btree_iter_peek_upto(&iter, POS(inum.inum, U64_MAX));
 431                 if ((ret = bkey_err(k)))
 432                         goto btree_err;
 433
 434                 if (!k.k ||
 435                     k.k->p.inode != inum.inum ||
 436                     bkey_le(k.k->p, POS(inum.inum, src_offset)))
 437                         break;
 438
 439                 copy = bch2_bkey_make_mut_noupdate(trans, k);
 440                 if ((ret = PTR_ERR_OR_ZERO(copy)))
 441                         goto btree_err;
 442
 443                 if (insert &&
 444                     bkey_lt(bkey_start_pos(k.k), src_pos)) {
 445                         bch2_cut_front(src_pos, copy);
 446
 447                         /* Splitting compressed extent? */
 448                         bch2_disk_reservation_add(c, &disk_res,
 449                                         copy->k.size *
 450                                         bch2_bkey_nr_ptrs_allocated(bkey_i_to_s_c(copy)),
 451                                         BCH_DISK_RESERVATION_NOFAIL);
 452                 }
 453
 454                 bkey_init(&delete.k);
 455                 delete.k.p = copy->k.p;
 456                 delete.k.p.snapshot = snapshot;
 457                 delete.k.size = copy->k.size;
 458
 459                 copy->k.p.offset += shift;
 460                 copy->k.p.snapshot = snapshot;
 461
 462                 op->v.pos = cpu_to_le64(insert ? bkey_start_offset(&delete.k) : delete.k.p.offset);
 463
 464                 ret =   bch2_bkey_set_needs_rebalance(c, copy, &opts) ?:
 465                         bch2_btree_insert_trans(trans, BTREE_ID_extents, &delete, 0) ?:
 466                         bch2_btree_insert_trans(trans, BTREE_ID_extents, copy, 0) ?:
 467                         bch2_logged_op_update(trans, &op->k_i) ?:
 468                         bch2_trans_commit(trans, &disk_res, NULL, BCH_TRANS_COMMIT_no_enospc);
 469 btree_err:
 470                 bch2_disk_reservation_put(c, &disk_res);
 471
 472                 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
 473                         continue;
 474                 if (ret)
 475                         goto err;
 476
 477                 pos = le64_to_cpu(op->v.pos);
 478         }
 479
 480         op->v.state = LOGGED_OP_FINSERT_finish;
 481
 482         if (!insert) {
 483                 ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
 484                                 adjust_i_size(trans, inum, src_offset, shift, warn_errors) ?:
 485                                 bch2_logged_op_update(trans, &op->k_i));
 486         } else {
 487                 /* We need an inode update to update bi_journal_seq for fsync: */
 488                 ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
 489                                 adjust_i_size(trans, inum, 0, 0, warn_errors) ?:
 490                                 bch2_logged_op_update(trans, &op->k_i));
 491         }
 492
 493         break;
 494 case LOGGED_OP_FINSERT_finish:
 495         break;
 496         }
 497 err:
 498         bch2_trans_iter_exit(trans, &iter);
 499         if (warn_errors)
 500                 bch_err_fn(c, ret);
 501         return ret;
 502 }
 503
 504 int bch2_resume_logged_op_finsert(struct btree_trans *trans, struct bkey_i *op_k)
 505 {
 506         return __bch2_resume_logged_op_finsert(trans, op_k, NULL);
 507 }
 508
 509 int bch2_fcollapse_finsert(struct bch_fs *c, subvol_inum inum,
 510                            u64 offset, u64 len, bool insert,
 511                            s64 *i_sectors_delta)
 512 {
 513         struct bkey_i_logged_op_finsert op;
 514         s64 shift = insert ? len : -len;
 515
 516         bkey_logged_op_finsert_init(&op.k_i);
 517         op.v.subvol     = cpu_to_le32(inum.subvol);
 518         op.v.inum       = cpu_to_le64(inum.inum);
 519         op.v.dst_offset = cpu_to_le64(offset + shift);
 520         op.v.src_offset = cpu_to_le64(offset);
 521         op.v.pos        = cpu_to_le64(insert ? U64_MAX : offset);
 522
 523         /*
 524          * Logged ops aren't atomic w.r.t. snapshot creation: creating a
 525          * snapshot while they're in progress, then crashing, will result in the
 526          * resume only proceeding in one of the snapshots
 527          */
 528         down_read(&c->snapshot_create_lock);
 529         struct btree_trans *trans = bch2_trans_get(c);
 530         int ret = bch2_logged_op_start(trans, &op.k_i);
 531         if (ret)
 532                 goto out;
 533         ret = __bch2_resume_logged_op_finsert(trans, &op.k_i, i_sectors_delta);
 534         ret = bch2_logged_op_finish(trans, &op.k_i) ?: ret;
 535 out:
 536         bch2_trans_put(trans);
 537         up_read(&c->snapshot_create_lock);
 538
 539         return ret;
 540 }