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(trans); 129 closure_sync(&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 { 229 struct btree_iter iter = { NULL }; 230 struct bch_inode_unpacked inode_u; 231 int ret; 232 233 ret = bch2_inode_peek(trans, &iter, &inode_u, inum, BTREE_ITER_INTENT) ?: 234 (inode_u.bi_size = new_i_size, 0) ?: 235 bch2_inode_write(trans, &iter, &inode_u); 236 237 bch2_trans_iter_exit(trans, &iter); 238 return ret; 239 } 240 241 static int __bch2_resume_logged_op_truncate(struct btree_trans *trans, 242 struct bkey_i *op_k, 243 u64 *i_sectors_delta) 244 { 245 struct bch_fs *c = trans->c; 246 struct btree_iter fpunch_iter; 247 struct bkey_i_logged_op_truncate *op = bkey_i_to_logged_op_truncate(op_k); 248 subvol_inum inum = { le32_to_cpu(op->v.subvol), le64_to_cpu(op->v.inum) }; 249 u64 new_i_size = le64_to_cpu(op->v.new_i_size); 250 int ret; 251 252 ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc, 253 truncate_set_isize(trans, inum, new_i_size)); 254 if (ret) 255 goto err; 256 257 bch2_trans_iter_init(trans, &fpunch_iter, BTREE_ID_extents, 258 POS(inum.inum, round_up(new_i_size, block_bytes(c)) >> 9), 259 BTREE_ITER_INTENT); 260 ret = bch2_fpunch_at(trans, &fpunch_iter, inum, U64_MAX, i_sectors_delta); 261 bch2_trans_iter_exit(trans, &fpunch_iter); 262 263 if (bch2_err_matches(ret, BCH_ERR_transaction_restart)) 264 ret = 0; 265 err: 266 bch2_logged_op_finish(trans, op_k); 267 return ret; 268 } 269 270 int bch2_resume_logged_op_truncate(struct btree_trans *trans, struct bkey_i *op_k) 271 { 272 return __bch2_resume_logged_op_truncate(trans, op_k, NULL); 273 } 274 275 int bch2_truncate(struct bch_fs *c, subvol_inum inum, u64 new_i_size, u64 *i_sectors_delta) 276 { 277 struct bkey_i_logged_op_truncate op; 278 279 bkey_logged_op_truncate_init(&op.k_i); 280 op.v.subvol = cpu_to_le32(inum.subvol); 281 op.v.inum = cpu_to_le64(inum.inum); 282 op.v.new_i_size = cpu_to_le64(new_i_size); 283 284 /* 285 * Logged ops aren't atomic w.r.t. snapshot creation: creating a 286 * snapshot while they're in progress, then crashing, will result in the 287 * resume only proceeding in one of the snapshots 288 */ 289 down_read(&c->snapshot_create_lock); 290 int ret = bch2_trans_run(c, 291 bch2_logged_op_start(trans, &op.k_i) ?: 292 __bch2_resume_logged_op_truncate(trans, &op.k_i, i_sectors_delta)); 293 up_read(&c->snapshot_create_lock); 294 295 return ret; 296 } 297 298 /* finsert/fcollapse: */ 299 300 void bch2_logged_op_finsert_to_text(struct printbuf *out, struct bch_fs *c, struct bkey_s_c k) 301 { 302 struct bkey_s_c_logged_op_finsert op = bkey_s_c_to_logged_op_finsert(k); 303 304 prt_printf(out, "subvol=%u", le32_to_cpu(op.v->subvol)); 305 prt_printf(out, " inum=%llu", le64_to_cpu(op.v->inum)); 306 prt_printf(out, " dst_offset=%lli", le64_to_cpu(op.v->dst_offset)); 307 prt_printf(out, " src_offset=%llu", le64_to_cpu(op.v->src_offset)); 308 } 309 310 static int adjust_i_size(struct btree_trans *trans, subvol_inum inum, u64 offset, s64 len) 311 { 312 struct btree_iter iter; 313 struct bch_inode_unpacked inode_u; 314 int ret; 315 316 offset <<= 9; 317 len <<= 9; 318 319 ret = bch2_inode_peek(trans, &iter, &inode_u, inum, BTREE_ITER_INTENT); 320 if (ret) 321 return ret; 322 323 if (len > 0) { 324 if (MAX_LFS_FILESIZE - inode_u.bi_size < len) { 325 ret = -EFBIG; 326 goto err; 327 } 328 329 if (offset >= inode_u.bi_size) { 330 ret = -EINVAL; 331 goto err; 332 } 333 } 334 335 inode_u.bi_size += len; 336 inode_u.bi_mtime = inode_u.bi_ctime = bch2_current_time(trans->c); 337 338 ret = bch2_inode_write(trans, &iter, &inode_u); 339 err: 340 bch2_trans_iter_exit(trans, &iter); 341 return ret; 342 } 343 344 static int __bch2_resume_logged_op_finsert(struct btree_trans *trans, 345 struct bkey_i *op_k, 346 u64 *i_sectors_delta) 347 { 348 struct bch_fs *c = trans->c; 349 struct btree_iter iter; 350 struct bkey_i_logged_op_finsert *op = bkey_i_to_logged_op_finsert(op_k); 351 subvol_inum inum = { le32_to_cpu(op->v.subvol), le64_to_cpu(op->v.inum) }; 352 struct bch_io_opts opts; 353 u64 dst_offset = le64_to_cpu(op->v.dst_offset); 354 u64 src_offset = le64_to_cpu(op->v.src_offset); 355 s64 shift = dst_offset - src_offset; 356 u64 len = abs(shift); 357 u64 pos = le64_to_cpu(op->v.pos); 358 bool insert = shift > 0; 359 int ret = 0; 360 361 ret = bch2_inum_opts_get(trans, inum, &opts); 362 if (ret) 363 return ret; 364 365 bch2_trans_iter_init(trans, &iter, BTREE_ID_extents, 366 POS(inum.inum, 0), 367 BTREE_ITER_INTENT); 368 369 switch (op->v.state) { 370 case LOGGED_OP_FINSERT_start: 371 op->v.state = LOGGED_OP_FINSERT_shift_extents; 372 373 if (insert) { 374 ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc, 375 adjust_i_size(trans, inum, src_offset, len) ?: 376 bch2_logged_op_update(trans, &op->k_i)); 377 if (ret) 378 goto err; 379 } else { 380 bch2_btree_iter_set_pos(&iter, POS(inum.inum, src_offset)); 381 382 ret = bch2_fpunch_at(trans, &iter, inum, src_offset + len, i_sectors_delta); 383 if (ret && !bch2_err_matches(ret, BCH_ERR_transaction_restart)) 384 goto err; 385 386 ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc, 387 bch2_logged_op_update(trans, &op->k_i)); 388 } 389 390 fallthrough; 391 case LOGGED_OP_FINSERT_shift_extents: 392 while (1) { 393 struct disk_reservation disk_res = 394 bch2_disk_reservation_init(c, 0); 395 struct bkey_i delete, *copy; 396 struct bkey_s_c k; 397 struct bpos src_pos = POS(inum.inum, src_offset); 398 u32 snapshot; 399 400 bch2_trans_begin(trans); 401 402 ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot); 403 if (ret) 404 goto btree_err; 405 406 bch2_btree_iter_set_snapshot(&iter, snapshot); 407 bch2_btree_iter_set_pos(&iter, SPOS(inum.inum, pos, snapshot)); 408 409 k = insert 410 ? bch2_btree_iter_peek_prev(&iter) 411 : bch2_btree_iter_peek_upto(&iter, POS(inum.inum, U64_MAX)); 412 if ((ret = bkey_err(k))) 413 goto btree_err; 414 415 if (!k.k || 416 k.k->p.inode != inum.inum || 417 bkey_le(k.k->p, POS(inum.inum, src_offset))) 418 break; 419 420 copy = bch2_bkey_make_mut_noupdate(trans, k); 421 if ((ret = PTR_ERR_OR_ZERO(copy))) 422 goto btree_err; 423 424 if (insert && 425 bkey_lt(bkey_start_pos(k.k), src_pos)) { 426 bch2_cut_front(src_pos, copy); 427 428 /* Splitting compressed extent? */ 429 bch2_disk_reservation_add(c, &disk_res, 430 copy->k.size * 431 bch2_bkey_nr_ptrs_allocated(bkey_i_to_s_c(copy)), 432 BCH_DISK_RESERVATION_NOFAIL); 433 } 434 435 bkey_init(&delete.k); 436 delete.k.p = copy->k.p; 437 delete.k.p.snapshot = snapshot; 438 delete.k.size = copy->k.size; 439 440 copy->k.p.offset += shift; 441 copy->k.p.snapshot = snapshot; 442 443 op->v.pos = cpu_to_le64(insert ? bkey_start_offset(&delete.k) : delete.k.p.offset); 444 445 ret = bch2_bkey_set_needs_rebalance(c, copy, &opts) ?: 446 bch2_btree_insert_trans(trans, BTREE_ID_extents, &delete, 0) ?: 447 bch2_btree_insert_trans(trans, BTREE_ID_extents, copy, 0) ?: 448 bch2_logged_op_update(trans, &op->k_i) ?: 449 bch2_trans_commit(trans, &disk_res, NULL, BCH_TRANS_COMMIT_no_enospc); 450 btree_err: 451 bch2_disk_reservation_put(c, &disk_res); 452 453 if (bch2_err_matches(ret, BCH_ERR_transaction_restart)) 454 continue; 455 if (ret) 456 goto err; 457 458 pos = le64_to_cpu(op->v.pos); 459 } 460 461 op->v.state = LOGGED_OP_FINSERT_finish; 462 463 if (!insert) { 464 ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc, 465 adjust_i_size(trans, inum, src_offset, shift) ?: 466 bch2_logged_op_update(trans, &op->k_i)); 467 } else { 468 /* We need an inode update to update bi_journal_seq for fsync: */ 469 ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc, 470 adjust_i_size(trans, inum, 0, 0) ?: 471 bch2_logged_op_update(trans, &op->k_i)); 472 } 473 474 break; 475 case LOGGED_OP_FINSERT_finish: 476 break; 477 } 478 err: 479 bch2_logged_op_finish(trans, op_k); 480 bch2_trans_iter_exit(trans, &iter); 481 return ret; 482 } 483 484 int bch2_resume_logged_op_finsert(struct btree_trans *trans, struct bkey_i *op_k) 485 { 486 return __bch2_resume_logged_op_finsert(trans, op_k, NULL); 487 } 488 489 int bch2_fcollapse_finsert(struct bch_fs *c, subvol_inum inum, 490 u64 offset, u64 len, bool insert, 491 s64 *i_sectors_delta) 492 { 493 struct bkey_i_logged_op_finsert op; 494 s64 shift = insert ? len : -len; 495 496 bkey_logged_op_finsert_init(&op.k_i); 497 op.v.subvol = cpu_to_le32(inum.subvol); 498 op.v.inum = cpu_to_le64(inum.inum); 499 op.v.dst_offset = cpu_to_le64(offset + shift); 500 op.v.src_offset = cpu_to_le64(offset); 501 op.v.pos = cpu_to_le64(insert ? U64_MAX : offset); 502 503 /* 504 * Logged ops aren't atomic w.r.t. snapshot creation: creating a 505 * snapshot while they're in progress, then crashing, will result in the 506 * resume only proceeding in one of the snapshots 507 */ 508 down_read(&c->snapshot_create_lock); 509 int ret = bch2_trans_run(c, 510 bch2_logged_op_start(trans, &op.k_i) ?: 511 __bch2_resume_logged_op_finsert(trans, &op.k_i, i_sectors_delta)); 512 up_read(&c->snapshot_create_lock); 513 514 return ret; 515 } 516