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: */ 23int 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); 113err: 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)); 121err_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 */ 138int 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 192int 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 216void 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 225static 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 241static 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; 265err: 266 bch2_logged_op_finish(trans, op_k); 267 bch_err_fn(c, ret); 268 return ret; 269} 270 271int bch2_resume_logged_op_truncate(struct btree_trans *trans, struct bkey_i *op_k) 272{ 273 return __bch2_resume_logged_op_truncate(trans, op_k, NULL); 274} 275 276int bch2_truncate(struct bch_fs *c, subvol_inum inum, u64 new_i_size, u64 *i_sectors_delta) 277{ 278 struct bkey_i_logged_op_truncate op; 279 280 bkey_logged_op_truncate_init(&op.k_i); 281 op.v.subvol = cpu_to_le32(inum.subvol); 282 op.v.inum = cpu_to_le64(inum.inum); 283 op.v.new_i_size = cpu_to_le64(new_i_size); 284 285 /* 286 * Logged ops aren't atomic w.r.t. snapshot creation: creating a 287 * snapshot while they're in progress, then crashing, will result in the 288 * resume only proceeding in one of the snapshots 289 */ 290 down_read(&c->snapshot_create_lock); 291 int ret = bch2_trans_run(c, 292 bch2_logged_op_start(trans, &op.k_i) ?: 293 __bch2_resume_logged_op_truncate(trans, &op.k_i, i_sectors_delta)); 294 up_read(&c->snapshot_create_lock); 295 296 return ret; 297} 298 299/* finsert/fcollapse: */ 300 301void bch2_logged_op_finsert_to_text(struct printbuf *out, struct bch_fs *c, struct bkey_s_c k) 302{ 303 struct bkey_s_c_logged_op_finsert op = bkey_s_c_to_logged_op_finsert(k); 304 305 prt_printf(out, "subvol=%u", le32_to_cpu(op.v->subvol)); 306 prt_printf(out, " inum=%llu", le64_to_cpu(op.v->inum)); 307 prt_printf(out, " dst_offset=%lli", le64_to_cpu(op.v->dst_offset)); 308 prt_printf(out, " src_offset=%llu", le64_to_cpu(op.v->src_offset)); 309} 310 311static int adjust_i_size(struct btree_trans *trans, subvol_inum inum, u64 offset, s64 len) 312{ 313 struct btree_iter iter; 314 struct bch_inode_unpacked inode_u; 315 int ret; 316 317 offset <<= 9; 318 len <<= 9; 319 320 ret = bch2_inode_peek(trans, &iter, &inode_u, inum, BTREE_ITER_INTENT); 321 if (ret) 322 return ret; 323 324 if (len > 0) { 325 if (MAX_LFS_FILESIZE - inode_u.bi_size < len) { 326 ret = -EFBIG; 327 goto err; 328 } 329 330 if (offset >= inode_u.bi_size) { 331 ret = -EINVAL; 332 goto err; 333 } 334 } 335 336 inode_u.bi_size += len; 337 inode_u.bi_mtime = inode_u.bi_ctime = bch2_current_time(trans->c); 338 339 ret = bch2_inode_write(trans, &iter, &inode_u); 340err: 341 bch2_trans_iter_exit(trans, &iter); 342 return ret; 343} 344 345static int __bch2_resume_logged_op_finsert(struct btree_trans *trans, 346 struct bkey_i *op_k, 347 u64 *i_sectors_delta) 348{ 349 struct bch_fs *c = trans->c; 350 struct btree_iter iter; 351 struct bkey_i_logged_op_finsert *op = bkey_i_to_logged_op_finsert(op_k); 352 subvol_inum inum = { le32_to_cpu(op->v.subvol), le64_to_cpu(op->v.inum) }; 353 struct bch_io_opts opts; 354 u64 dst_offset = le64_to_cpu(op->v.dst_offset); 355 u64 src_offset = le64_to_cpu(op->v.src_offset); 356 s64 shift = dst_offset - src_offset; 357 u64 len = abs(shift); 358 u64 pos = le64_to_cpu(op->v.pos); 359 bool insert = shift > 0; 360 int ret = 0; 361 362 ret = bch2_inum_opts_get(trans, inum, &opts); 363 if (ret) 364 return ret; 365 366 bch2_trans_iter_init(trans, &iter, BTREE_ID_extents, 367 POS(inum.inum, 0), 368 BTREE_ITER_INTENT); 369 370 switch (op->v.state) { 371case LOGGED_OP_FINSERT_start: 372 op->v.state = LOGGED_OP_FINSERT_shift_extents; 373 374 if (insert) { 375 ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc, 376 adjust_i_size(trans, inum, src_offset, len) ?: 377 bch2_logged_op_update(trans, &op->k_i)); 378 if (ret) 379 goto err; 380 } else { 381 bch2_btree_iter_set_pos(&iter, POS(inum.inum, src_offset)); 382 383 ret = bch2_fpunch_at(trans, &iter, inum, src_offset + len, i_sectors_delta); 384 if (ret && !bch2_err_matches(ret, BCH_ERR_transaction_restart)) 385 goto err; 386 387 ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc, 388 bch2_logged_op_update(trans, &op->k_i)); 389 } 390 391 fallthrough; 392case LOGGED_OP_FINSERT_shift_extents: 393 while (1) { 394 struct disk_reservation disk_res = 395 bch2_disk_reservation_init(c, 0); 396 struct bkey_i delete, *copy; 397 struct bkey_s_c k; 398 struct bpos src_pos = POS(inum.inum, src_offset); 399 u32 snapshot; 400 401 bch2_trans_begin(trans); 402 403 ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot); 404 if (ret) 405 goto btree_err; 406 407 bch2_btree_iter_set_snapshot(&iter, snapshot); 408 bch2_btree_iter_set_pos(&iter, SPOS(inum.inum, pos, snapshot)); 409 410 k = insert 411 ? bch2_btree_iter_peek_prev(&iter) 412 : bch2_btree_iter_peek_upto(&iter, POS(inum.inum, U64_MAX)); 413 if ((ret = bkey_err(k))) 414 goto btree_err; 415 416 if (!k.k || 417 k.k->p.inode != inum.inum || 418 bkey_le(k.k->p, POS(inum.inum, src_offset))) 419 break; 420 421 copy = bch2_bkey_make_mut_noupdate(trans, k); 422 if ((ret = PTR_ERR_OR_ZERO(copy))) 423 goto btree_err; 424 425 if (insert && 426 bkey_lt(bkey_start_pos(k.k), src_pos)) { 427 bch2_cut_front(src_pos, copy); 428 429 /* Splitting compressed extent? */ 430 bch2_disk_reservation_add(c, &disk_res, 431 copy->k.size * 432 bch2_bkey_nr_ptrs_allocated(bkey_i_to_s_c(copy)), 433 BCH_DISK_RESERVATION_NOFAIL); 434 } 435 436 bkey_init(&delete.k); 437 delete.k.p = copy->k.p; 438 delete.k.p.snapshot = snapshot; 439 delete.k.size = copy->k.size; 440 441 copy->k.p.offset += shift; 442 copy->k.p.snapshot = snapshot; 443 444 op->v.pos = cpu_to_le64(insert ? bkey_start_offset(&delete.k) : delete.k.p.offset); 445 446 ret = bch2_bkey_set_needs_rebalance(c, copy, &opts) ?: 447 bch2_btree_insert_trans(trans, BTREE_ID_extents, &delete, 0) ?: 448 bch2_btree_insert_trans(trans, BTREE_ID_extents, copy, 0) ?: 449 bch2_logged_op_update(trans, &op->k_i) ?: 450 bch2_trans_commit(trans, &disk_res, NULL, BCH_TRANS_COMMIT_no_enospc); 451btree_err: 452 bch2_disk_reservation_put(c, &disk_res); 453 454 if (bch2_err_matches(ret, BCH_ERR_transaction_restart)) 455 continue; 456 if (ret) 457 goto err; 458 459 pos = le64_to_cpu(op->v.pos); 460 } 461 462 op->v.state = LOGGED_OP_FINSERT_finish; 463 464 if (!insert) { 465 ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc, 466 adjust_i_size(trans, inum, src_offset, shift) ?: 467 bch2_logged_op_update(trans, &op->k_i)); 468 } else { 469 /* We need an inode update to update bi_journal_seq for fsync: */ 470 ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc, 471 adjust_i_size(trans, inum, 0, 0) ?: 472 bch2_logged_op_update(trans, &op->k_i)); 473 } 474 475 break; 476case LOGGED_OP_FINSERT_finish: 477 break; 478 } 479err: 480 bch_err_fn(c, ret); 481 bch2_logged_op_finish(trans, op_k); 482 bch2_trans_iter_exit(trans, &iter); 483 return ret; 484} 485 486int bch2_resume_logged_op_finsert(struct btree_trans *trans, struct bkey_i *op_k) 487{ 488 return __bch2_resume_logged_op_finsert(trans, op_k, NULL); 489} 490 491int bch2_fcollapse_finsert(struct bch_fs *c, subvol_inum inum, 492 u64 offset, u64 len, bool insert, 493 s64 *i_sectors_delta) 494{ 495 struct bkey_i_logged_op_finsert op; 496 s64 shift = insert ? len : -len; 497 498 bkey_logged_op_finsert_init(&op.k_i); 499 op.v.subvol = cpu_to_le32(inum.subvol); 500 op.v.inum = cpu_to_le64(inum.inum); 501 op.v.dst_offset = cpu_to_le64(offset + shift); 502 op.v.src_offset = cpu_to_le64(offset); 503 op.v.pos = cpu_to_le64(insert ? U64_MAX : offset); 504 505 /* 506 * Logged ops aren't atomic w.r.t. snapshot creation: creating a 507 * snapshot while they're in progress, then crashing, will result in the 508 * resume only proceeding in one of the snapshots 509 */ 510 down_read(&c->snapshot_create_lock); 511 int ret = bch2_trans_run(c, 512 bch2_logged_op_start(trans, &op.k_i) ?: 513 __bch2_resume_logged_op_finsert(trans, &op.k_i, i_sectors_delta)); 514 up_read(&c->snapshot_create_lock); 515 516 return ret; 517} 518