1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2007 Oracle. All rights reserved. 4 * Copyright (C) 2022 Christoph Hellwig. 5 */ 6 7 #include <linux/bio.h> 8 #include "bio.h" 9 #include "ctree.h" 10 #include "volumes.h" 11 #include "raid56.h" 12 #include "async-thread.h" 13 #include "check-integrity.h" 14 #include "dev-replace.h" 15 #include "rcu-string.h" 16 #include "zoned.h" 17 #include "file-item.h" 18 19 static struct bio_set btrfs_bioset; 20 static struct bio_set btrfs_clone_bioset; 21 static struct bio_set btrfs_repair_bioset; 22 static mempool_t btrfs_failed_bio_pool; 23 24 struct btrfs_failed_bio { 25 struct btrfs_bio *bbio; 26 int num_copies; 27 atomic_t repair_count; 28 }; 29 30 /* 31 * Initialize a btrfs_bio structure. This skips the embedded bio itself as it 32 * is already initialized by the block layer. 33 */ 34 void btrfs_bio_init(struct btrfs_bio *bbio, struct btrfs_fs_info *fs_info, 35 btrfs_bio_end_io_t end_io, void *private) 36 { 37 memset(bbio, 0, offsetof(struct btrfs_bio, bio)); 38 bbio->fs_info = fs_info; 39 bbio->end_io = end_io; 40 bbio->private = private; 41 atomic_set(&bbio->pending_ios, 1); 42 } 43 44 /* 45 * Allocate a btrfs_bio structure. The btrfs_bio is the main I/O container for 46 * btrfs, and is used for all I/O submitted through btrfs_submit_bio. 47 * 48 * Just like the underlying bio_alloc_bioset it will not fail as it is backed by 49 * a mempool. 50 */ 51 struct btrfs_bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf, 52 struct btrfs_fs_info *fs_info, 53 btrfs_bio_end_io_t end_io, void *private) 54 { 55 struct btrfs_bio *bbio; 56 struct bio *bio; 57 58 bio = bio_alloc_bioset(NULL, nr_vecs, opf, GFP_NOFS, &btrfs_bioset); 59 bbio = btrfs_bio(bio); 60 btrfs_bio_init(bbio, fs_info, end_io, private); 61 return bbio; 62 } 63 64 static blk_status_t btrfs_bio_extract_ordered_extent(struct btrfs_bio *bbio) 65 { 66 struct btrfs_ordered_extent *ordered; 67 int ret; 68 69 ordered = btrfs_lookup_ordered_extent(bbio->inode, bbio->file_offset); 70 if (WARN_ON_ONCE(!ordered)) 71 return BLK_STS_IOERR; 72 ret = btrfs_extract_ordered_extent(bbio, ordered); 73 btrfs_put_ordered_extent(ordered); 74 75 return errno_to_blk_status(ret); 76 } 77 78 static struct btrfs_bio *btrfs_split_bio(struct btrfs_fs_info *fs_info, 79 struct btrfs_bio *orig_bbio, 80 u64 map_length, bool use_append) 81 { 82 struct btrfs_bio *bbio; 83 struct bio *bio; 84 85 if (use_append) { 86 unsigned int nr_segs; 87 88 bio = bio_split_rw(&orig_bbio->bio, &fs_info->limits, &nr_segs, 89 &btrfs_clone_bioset, map_length); 90 } else { 91 bio = bio_split(&orig_bbio->bio, map_length >> SECTOR_SHIFT, 92 GFP_NOFS, &btrfs_clone_bioset); 93 } 94 bbio = btrfs_bio(bio); 95 btrfs_bio_init(bbio, fs_info, NULL, orig_bbio); 96 bbio->inode = orig_bbio->inode; 97 bbio->file_offset = orig_bbio->file_offset; 98 if (!(orig_bbio->bio.bi_opf & REQ_BTRFS_ONE_ORDERED)) 99 orig_bbio->file_offset += map_length; 100 101 atomic_inc(&orig_bbio->pending_ios); 102 return bbio; 103 } 104 105 static void btrfs_orig_write_end_io(struct bio *bio); 106 107 static void btrfs_bbio_propagate_error(struct btrfs_bio *bbio, 108 struct btrfs_bio *orig_bbio) 109 { 110 /* 111 * For writes we tolerate nr_mirrors - 1 write failures, so we can't 112 * just blindly propagate a write failure here. Instead increment the 113 * error count in the original I/O context so that it is guaranteed to 114 * be larger than the error tolerance. 115 */ 116 if (bbio->bio.bi_end_io == &btrfs_orig_write_end_io) { 117 struct btrfs_io_stripe *orig_stripe = orig_bbio->bio.bi_private; 118 struct btrfs_io_context *orig_bioc = orig_stripe->bioc; 119 120 atomic_add(orig_bioc->max_errors, &orig_bioc->error); 121 } else { 122 orig_bbio->bio.bi_status = bbio->bio.bi_status; 123 } 124 } 125 126 static void btrfs_orig_bbio_end_io(struct btrfs_bio *bbio) 127 { 128 if (bbio->bio.bi_pool == &btrfs_clone_bioset) { 129 struct btrfs_bio *orig_bbio = bbio->private; 130 131 if (bbio->bio.bi_status) 132 btrfs_bbio_propagate_error(bbio, orig_bbio); 133 bio_put(&bbio->bio); 134 bbio = orig_bbio; 135 } 136 137 if (atomic_dec_and_test(&bbio->pending_ios)) 138 bbio->end_io(bbio); 139 } 140 141 static int next_repair_mirror(struct btrfs_failed_bio *fbio, int cur_mirror) 142 { 143 if (cur_mirror == fbio->num_copies) 144 return cur_mirror + 1 - fbio->num_copies; 145 return cur_mirror + 1; 146 } 147 148 static int prev_repair_mirror(struct btrfs_failed_bio *fbio, int cur_mirror) 149 { 150 if (cur_mirror == 1) 151 return fbio->num_copies; 152 return cur_mirror - 1; 153 } 154 155 static void btrfs_repair_done(struct btrfs_failed_bio *fbio) 156 { 157 if (atomic_dec_and_test(&fbio->repair_count)) { 158 btrfs_orig_bbio_end_io(fbio->bbio); 159 mempool_free(fbio, &btrfs_failed_bio_pool); 160 } 161 } 162 163 static void btrfs_end_repair_bio(struct btrfs_bio *repair_bbio, 164 struct btrfs_device *dev) 165 { 166 struct btrfs_failed_bio *fbio = repair_bbio->private; 167 struct btrfs_inode *inode = repair_bbio->inode; 168 struct btrfs_fs_info *fs_info = inode->root->fs_info; 169 struct bio_vec *bv = bio_first_bvec_all(&repair_bbio->bio); 170 int mirror = repair_bbio->mirror_num; 171 172 if (repair_bbio->bio.bi_status || 173 !btrfs_data_csum_ok(repair_bbio, dev, 0, bv)) { 174 bio_reset(&repair_bbio->bio, NULL, REQ_OP_READ); 175 repair_bbio->bio.bi_iter = repair_bbio->saved_iter; 176 177 mirror = next_repair_mirror(fbio, mirror); 178 if (mirror == fbio->bbio->mirror_num) { 179 btrfs_debug(fs_info, "no mirror left"); 180 fbio->bbio->bio.bi_status = BLK_STS_IOERR; 181 goto done; 182 } 183 184 btrfs_submit_bio(repair_bbio, mirror); 185 return; 186 } 187 188 do { 189 mirror = prev_repair_mirror(fbio, mirror); 190 btrfs_repair_io_failure(fs_info, btrfs_ino(inode), 191 repair_bbio->file_offset, fs_info->sectorsize, 192 repair_bbio->saved_iter.bi_sector << SECTOR_SHIFT, 193 bv->bv_page, bv->bv_offset, mirror); 194 } while (mirror != fbio->bbio->mirror_num); 195 196 done: 197 btrfs_repair_done(fbio); 198 bio_put(&repair_bbio->bio); 199 } 200 201 /* 202 * Try to kick off a repair read to the next available mirror for a bad sector. 203 * 204 * This primarily tries to recover good data to serve the actual read request, 205 * but also tries to write the good data back to the bad mirror(s) when a 206 * read succeeded to restore the redundancy. 207 */ 208 static struct btrfs_failed_bio *repair_one_sector(struct btrfs_bio *failed_bbio, 209 u32 bio_offset, 210 struct bio_vec *bv, 211 struct btrfs_failed_bio *fbio) 212 { 213 struct btrfs_inode *inode = failed_bbio->inode; 214 struct btrfs_fs_info *fs_info = inode->root->fs_info; 215 const u32 sectorsize = fs_info->sectorsize; 216 const u64 logical = (failed_bbio->saved_iter.bi_sector << SECTOR_SHIFT); 217 struct btrfs_bio *repair_bbio; 218 struct bio *repair_bio; 219 int num_copies; 220 int mirror; 221 222 btrfs_debug(fs_info, "repair read error: read error at %llu", 223 failed_bbio->file_offset + bio_offset); 224 225 num_copies = btrfs_num_copies(fs_info, logical, sectorsize); 226 if (num_copies == 1) { 227 btrfs_debug(fs_info, "no copy to repair from"); 228 failed_bbio->bio.bi_status = BLK_STS_IOERR; 229 return fbio; 230 } 231 232 if (!fbio) { 233 fbio = mempool_alloc(&btrfs_failed_bio_pool, GFP_NOFS); 234 fbio->bbio = failed_bbio; 235 fbio->num_copies = num_copies; 236 atomic_set(&fbio->repair_count, 1); 237 } 238 239 atomic_inc(&fbio->repair_count); 240 241 repair_bio = bio_alloc_bioset(NULL, 1, REQ_OP_READ, GFP_NOFS, 242 &btrfs_repair_bioset); 243 repair_bio->bi_iter.bi_sector = failed_bbio->saved_iter.bi_sector; 244 __bio_add_page(repair_bio, bv->bv_page, bv->bv_len, bv->bv_offset); 245 246 repair_bbio = btrfs_bio(repair_bio); 247 btrfs_bio_init(repair_bbio, fs_info, NULL, fbio); 248 repair_bbio->inode = failed_bbio->inode; 249 repair_bbio->file_offset = failed_bbio->file_offset + bio_offset; 250 251 mirror = next_repair_mirror(fbio, failed_bbio->mirror_num); 252 btrfs_debug(fs_info, "submitting repair read to mirror %d", mirror); 253 btrfs_submit_bio(repair_bbio, mirror); 254 return fbio; 255 } 256 257 static void btrfs_check_read_bio(struct btrfs_bio *bbio, struct btrfs_device *dev) 258 { 259 struct btrfs_inode *inode = bbio->inode; 260 struct btrfs_fs_info *fs_info = inode->root->fs_info; 261 u32 sectorsize = fs_info->sectorsize; 262 struct bvec_iter *iter = &bbio->saved_iter; 263 blk_status_t status = bbio->bio.bi_status; 264 struct btrfs_failed_bio *fbio = NULL; 265 u32 offset = 0; 266 267 /* Read-repair requires the inode field to be set by the submitter. */ 268 ASSERT(inode); 269 270 /* 271 * Hand off repair bios to the repair code as there is no upper level 272 * submitter for them. 273 */ 274 if (bbio->bio.bi_pool == &btrfs_repair_bioset) { 275 btrfs_end_repair_bio(bbio, dev); 276 return; 277 } 278 279 /* Clear the I/O error. A failed repair will reset it. */ 280 bbio->bio.bi_status = BLK_STS_OK; 281 282 while (iter->bi_size) { 283 struct bio_vec bv = bio_iter_iovec(&bbio->bio, *iter); 284 285 bv.bv_len = min(bv.bv_len, sectorsize); 286 if (status || !btrfs_data_csum_ok(bbio, dev, offset, &bv)) 287 fbio = repair_one_sector(bbio, offset, &bv, fbio); 288 289 bio_advance_iter_single(&bbio->bio, iter, sectorsize); 290 offset += sectorsize; 291 } 292 293 if (bbio->csum != bbio->csum_inline) 294 kfree(bbio->csum); 295 296 if (fbio) 297 btrfs_repair_done(fbio); 298 else 299 btrfs_orig_bbio_end_io(bbio); 300 } 301 302 static void btrfs_log_dev_io_error(struct bio *bio, struct btrfs_device *dev) 303 { 304 if (!dev || !dev->bdev) 305 return; 306 if (bio->bi_status != BLK_STS_IOERR && bio->bi_status != BLK_STS_TARGET) 307 return; 308 309 if (btrfs_op(bio) == BTRFS_MAP_WRITE) 310 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); 311 else if (!(bio->bi_opf & REQ_RAHEAD)) 312 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); 313 if (bio->bi_opf & REQ_PREFLUSH) 314 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_FLUSH_ERRS); 315 } 316 317 static struct workqueue_struct *btrfs_end_io_wq(struct btrfs_fs_info *fs_info, 318 struct bio *bio) 319 { 320 if (bio->bi_opf & REQ_META) 321 return fs_info->endio_meta_workers; 322 return fs_info->endio_workers; 323 } 324 325 static void btrfs_end_bio_work(struct work_struct *work) 326 { 327 struct btrfs_bio *bbio = container_of(work, struct btrfs_bio, end_io_work); 328 329 /* Metadata reads are checked and repaired by the submitter. */ 330 if (bbio->inode && !(bbio->bio.bi_opf & REQ_META)) 331 btrfs_check_read_bio(bbio, bbio->bio.bi_private); 332 else 333 btrfs_orig_bbio_end_io(bbio); 334 } 335 336 static void btrfs_simple_end_io(struct bio *bio) 337 { 338 struct btrfs_bio *bbio = btrfs_bio(bio); 339 struct btrfs_device *dev = bio->bi_private; 340 struct btrfs_fs_info *fs_info = bbio->fs_info; 341 342 btrfs_bio_counter_dec(fs_info); 343 344 if (bio->bi_status) 345 btrfs_log_dev_io_error(bio, dev); 346 347 if (bio_op(bio) == REQ_OP_READ) { 348 INIT_WORK(&bbio->end_io_work, btrfs_end_bio_work); 349 queue_work(btrfs_end_io_wq(fs_info, bio), &bbio->end_io_work); 350 } else { 351 if (bio_op(bio) == REQ_OP_ZONE_APPEND) 352 btrfs_record_physical_zoned(bbio); 353 btrfs_orig_bbio_end_io(bbio); 354 } 355 } 356 357 static void btrfs_raid56_end_io(struct bio *bio) 358 { 359 struct btrfs_io_context *bioc = bio->bi_private; 360 struct btrfs_bio *bbio = btrfs_bio(bio); 361 362 btrfs_bio_counter_dec(bioc->fs_info); 363 bbio->mirror_num = bioc->mirror_num; 364 if (bio_op(bio) == REQ_OP_READ && bbio->inode && 365 !(bbio->bio.bi_opf & REQ_META)) 366 btrfs_check_read_bio(bbio, NULL); 367 else 368 btrfs_orig_bbio_end_io(bbio); 369 370 btrfs_put_bioc(bioc); 371 } 372 373 static void btrfs_orig_write_end_io(struct bio *bio) 374 { 375 struct btrfs_io_stripe *stripe = bio->bi_private; 376 struct btrfs_io_context *bioc = stripe->bioc; 377 struct btrfs_bio *bbio = btrfs_bio(bio); 378 379 btrfs_bio_counter_dec(bioc->fs_info); 380 381 if (bio->bi_status) { 382 atomic_inc(&bioc->error); 383 btrfs_log_dev_io_error(bio, stripe->dev); 384 } 385 386 /* 387 * Only send an error to the higher layers if it is beyond the tolerance 388 * threshold. 389 */ 390 if (atomic_read(&bioc->error) > bioc->max_errors) 391 bio->bi_status = BLK_STS_IOERR; 392 else 393 bio->bi_status = BLK_STS_OK; 394 395 btrfs_orig_bbio_end_io(bbio); 396 btrfs_put_bioc(bioc); 397 } 398 399 static void btrfs_clone_write_end_io(struct bio *bio) 400 { 401 struct btrfs_io_stripe *stripe = bio->bi_private; 402 403 if (bio->bi_status) { 404 atomic_inc(&stripe->bioc->error); 405 btrfs_log_dev_io_error(bio, stripe->dev); 406 } 407 408 /* Pass on control to the original bio this one was cloned from */ 409 bio_endio(stripe->bioc->orig_bio); 410 bio_put(bio); 411 } 412 413 static void btrfs_submit_dev_bio(struct btrfs_device *dev, struct bio *bio) 414 { 415 if (!dev || !dev->bdev || 416 test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state) || 417 (btrfs_op(bio) == BTRFS_MAP_WRITE && 418 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))) { 419 bio_io_error(bio); 420 return; 421 } 422 423 bio_set_dev(bio, dev->bdev); 424 425 /* 426 * For zone append writing, bi_sector must point the beginning of the 427 * zone 428 */ 429 if (bio_op(bio) == REQ_OP_ZONE_APPEND) { 430 u64 physical = bio->bi_iter.bi_sector << SECTOR_SHIFT; 431 u64 zone_start = round_down(physical, dev->fs_info->zone_size); 432 433 ASSERT(btrfs_dev_is_sequential(dev, physical)); 434 bio->bi_iter.bi_sector = zone_start >> SECTOR_SHIFT; 435 } 436 btrfs_debug_in_rcu(dev->fs_info, 437 "%s: rw %d 0x%x, sector=%llu, dev=%lu (%s id %llu), size=%u", 438 __func__, bio_op(bio), bio->bi_opf, bio->bi_iter.bi_sector, 439 (unsigned long)dev->bdev->bd_dev, btrfs_dev_name(dev), 440 dev->devid, bio->bi_iter.bi_size); 441 442 btrfsic_check_bio(bio); 443 444 if (bio->bi_opf & REQ_BTRFS_CGROUP_PUNT) 445 blkcg_punt_bio_submit(bio); 446 else 447 submit_bio(bio); 448 } 449 450 static void btrfs_submit_mirrored_bio(struct btrfs_io_context *bioc, int dev_nr) 451 { 452 struct bio *orig_bio = bioc->orig_bio, *bio; 453 454 ASSERT(bio_op(orig_bio) != REQ_OP_READ); 455 456 /* Reuse the bio embedded into the btrfs_bio for the last mirror */ 457 if (dev_nr == bioc->num_stripes - 1) { 458 bio = orig_bio; 459 bio->bi_end_io = btrfs_orig_write_end_io; 460 } else { 461 bio = bio_alloc_clone(NULL, orig_bio, GFP_NOFS, &fs_bio_set); 462 bio_inc_remaining(orig_bio); 463 bio->bi_end_io = btrfs_clone_write_end_io; 464 } 465 466 bio->bi_private = &bioc->stripes[dev_nr]; 467 bio->bi_iter.bi_sector = bioc->stripes[dev_nr].physical >> SECTOR_SHIFT; 468 bioc->stripes[dev_nr].bioc = bioc; 469 btrfs_submit_dev_bio(bioc->stripes[dev_nr].dev, bio); 470 } 471 472 static void __btrfs_submit_bio(struct bio *bio, struct btrfs_io_context *bioc, 473 struct btrfs_io_stripe *smap, int mirror_num) 474 { 475 /* Do not leak our private flag into the block layer. */ 476 bio->bi_opf &= ~REQ_BTRFS_ONE_ORDERED; 477 478 if (!bioc) { 479 /* Single mirror read/write fast path. */ 480 btrfs_bio(bio)->mirror_num = mirror_num; 481 bio->bi_iter.bi_sector = smap->physical >> SECTOR_SHIFT; 482 bio->bi_private = smap->dev; 483 bio->bi_end_io = btrfs_simple_end_io; 484 btrfs_submit_dev_bio(smap->dev, bio); 485 } else if (bioc->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) { 486 /* Parity RAID write or read recovery. */ 487 bio->bi_private = bioc; 488 bio->bi_end_io = btrfs_raid56_end_io; 489 if (bio_op(bio) == REQ_OP_READ) 490 raid56_parity_recover(bio, bioc, mirror_num); 491 else 492 raid56_parity_write(bio, bioc); 493 } else { 494 /* Write to multiple mirrors. */ 495 int total_devs = bioc->num_stripes; 496 497 bioc->orig_bio = bio; 498 for (int dev_nr = 0; dev_nr < total_devs; dev_nr++) 499 btrfs_submit_mirrored_bio(bioc, dev_nr); 500 } 501 } 502 503 static blk_status_t btrfs_bio_csum(struct btrfs_bio *bbio) 504 { 505 if (bbio->bio.bi_opf & REQ_META) 506 return btree_csum_one_bio(bbio); 507 return btrfs_csum_one_bio(bbio); 508 } 509 510 /* 511 * Async submit bios are used to offload expensive checksumming onto the worker 512 * threads. 513 */ 514 struct async_submit_bio { 515 struct btrfs_bio *bbio; 516 struct btrfs_io_context *bioc; 517 struct btrfs_io_stripe smap; 518 int mirror_num; 519 struct btrfs_work work; 520 }; 521 522 /* 523 * In order to insert checksums into the metadata in large chunks, we wait 524 * until bio submission time. All the pages in the bio are checksummed and 525 * sums are attached onto the ordered extent record. 526 * 527 * At IO completion time the csums attached on the ordered extent record are 528 * inserted into the btree. 529 */ 530 static void run_one_async_start(struct btrfs_work *work) 531 { 532 struct async_submit_bio *async = 533 container_of(work, struct async_submit_bio, work); 534 blk_status_t ret; 535 536 ret = btrfs_bio_csum(async->bbio); 537 if (ret) 538 async->bbio->bio.bi_status = ret; 539 } 540 541 /* 542 * In order to insert checksums into the metadata in large chunks, we wait 543 * until bio submission time. All the pages in the bio are checksummed and 544 * sums are attached onto the ordered extent record. 545 * 546 * At IO completion time the csums attached on the ordered extent record are 547 * inserted into the tree. 548 */ 549 static void run_one_async_done(struct btrfs_work *work) 550 { 551 struct async_submit_bio *async = 552 container_of(work, struct async_submit_bio, work); 553 struct bio *bio = &async->bbio->bio; 554 555 /* If an error occurred we just want to clean up the bio and move on. */ 556 if (bio->bi_status) { 557 btrfs_orig_bbio_end_io(async->bbio); 558 return; 559 } 560 561 /* 562 * All of the bios that pass through here are from async helpers. 563 * Use REQ_BTRFS_CGROUP_PUNT to issue them from the owning cgroup's 564 * context. This changes nothing when cgroups aren't in use. 565 */ 566 bio->bi_opf |= REQ_BTRFS_CGROUP_PUNT; 567 __btrfs_submit_bio(bio, async->bioc, &async->smap, async->mirror_num); 568 } 569 570 static void run_one_async_free(struct btrfs_work *work) 571 { 572 kfree(container_of(work, struct async_submit_bio, work)); 573 } 574 575 static bool should_async_write(struct btrfs_bio *bbio) 576 { 577 /* Submit synchronously if the checksum implementation is fast. */ 578 if (test_bit(BTRFS_FS_CSUM_IMPL_FAST, &bbio->fs_info->flags)) 579 return false; 580 581 /* 582 * Try to defer the submission to a workqueue to parallelize the 583 * checksum calculation unless the I/O is issued synchronously. 584 */ 585 if (op_is_sync(bbio->bio.bi_opf)) 586 return false; 587 588 /* Zoned devices require I/O to be submitted in order. */ 589 if ((bbio->bio.bi_opf & REQ_META) && btrfs_is_zoned(bbio->fs_info)) 590 return false; 591 592 return true; 593 } 594 595 /* 596 * Submit bio to an async queue. 597 * 598 * Return true if the work has been succesfuly submitted, else false. 599 */ 600 static bool btrfs_wq_submit_bio(struct btrfs_bio *bbio, 601 struct btrfs_io_context *bioc, 602 struct btrfs_io_stripe *smap, int mirror_num) 603 { 604 struct btrfs_fs_info *fs_info = bbio->fs_info; 605 struct async_submit_bio *async; 606 607 async = kmalloc(sizeof(*async), GFP_NOFS); 608 if (!async) 609 return false; 610 611 async->bbio = bbio; 612 async->bioc = bioc; 613 async->smap = *smap; 614 async->mirror_num = mirror_num; 615 616 btrfs_init_work(&async->work, run_one_async_start, run_one_async_done, 617 run_one_async_free); 618 if (op_is_sync(bbio->bio.bi_opf)) 619 btrfs_queue_work(fs_info->hipri_workers, &async->work); 620 else 621 btrfs_queue_work(fs_info->workers, &async->work); 622 return true; 623 } 624 625 static bool btrfs_submit_chunk(struct btrfs_bio *bbio, int mirror_num) 626 { 627 struct btrfs_inode *inode = bbio->inode; 628 struct btrfs_fs_info *fs_info = bbio->fs_info; 629 struct btrfs_bio *orig_bbio = bbio; 630 struct bio *bio = &bbio->bio; 631 u64 logical = bio->bi_iter.bi_sector << SECTOR_SHIFT; 632 u64 length = bio->bi_iter.bi_size; 633 u64 map_length = length; 634 bool use_append = btrfs_use_zone_append(bbio); 635 struct btrfs_io_context *bioc = NULL; 636 struct btrfs_io_stripe smap; 637 blk_status_t ret; 638 int error; 639 640 btrfs_bio_counter_inc_blocked(fs_info); 641 error = __btrfs_map_block(fs_info, btrfs_op(bio), logical, &map_length, 642 &bioc, &smap, &mirror_num, 1); 643 if (error) { 644 ret = errno_to_blk_status(error); 645 goto fail; 646 } 647 648 map_length = min(map_length, length); 649 if (use_append) 650 map_length = min(map_length, fs_info->max_zone_append_size); 651 652 if (map_length < length) { 653 bbio = btrfs_split_bio(fs_info, bbio, map_length, use_append); 654 bio = &bbio->bio; 655 } 656 657 /* 658 * Save the iter for the end_io handler and preload the checksums for 659 * data reads. 660 */ 661 if (bio_op(bio) == REQ_OP_READ && inode && !(bio->bi_opf & REQ_META)) { 662 bbio->saved_iter = bio->bi_iter; 663 ret = btrfs_lookup_bio_sums(bbio); 664 if (ret) 665 goto fail_put_bio; 666 } 667 668 if (btrfs_op(bio) == BTRFS_MAP_WRITE) { 669 if (use_append) { 670 bio->bi_opf &= ~REQ_OP_WRITE; 671 bio->bi_opf |= REQ_OP_ZONE_APPEND; 672 ret = btrfs_bio_extract_ordered_extent(bbio); 673 if (ret) 674 goto fail_put_bio; 675 } 676 677 /* 678 * Csum items for reloc roots have already been cloned at this 679 * point, so they are handled as part of the no-checksum case. 680 */ 681 if (inode && !(inode->flags & BTRFS_INODE_NODATASUM) && 682 !test_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state) && 683 !btrfs_is_data_reloc_root(inode->root)) { 684 if (should_async_write(bbio) && 685 btrfs_wq_submit_bio(bbio, bioc, &smap, mirror_num)) 686 goto done; 687 688 ret = btrfs_bio_csum(bbio); 689 if (ret) 690 goto fail_put_bio; 691 } 692 } 693 694 __btrfs_submit_bio(bio, bioc, &smap, mirror_num); 695 done: 696 return map_length == length; 697 698 fail_put_bio: 699 if (map_length < length) 700 bio_put(bio); 701 fail: 702 btrfs_bio_counter_dec(fs_info); 703 btrfs_bio_end_io(orig_bbio, ret); 704 /* Do not submit another chunk */ 705 return true; 706 } 707 708 void btrfs_submit_bio(struct btrfs_bio *bbio, int mirror_num) 709 { 710 /* If bbio->inode is not populated, its file_offset must be 0. */ 711 ASSERT(bbio->inode || bbio->file_offset == 0); 712 713 while (!btrfs_submit_chunk(bbio, mirror_num)) 714 ; 715 } 716 717 /* 718 * Submit a repair write. 719 * 720 * This bypasses btrfs_submit_bio deliberately, as that writes all copies in a 721 * RAID setup. Here we only want to write the one bad copy, so we do the 722 * mapping ourselves and submit the bio directly. 723 * 724 * The I/O is issued synchronously to block the repair read completion from 725 * freeing the bio. 726 */ 727 int btrfs_repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, 728 u64 length, u64 logical, struct page *page, 729 unsigned int pg_offset, int mirror_num) 730 { 731 struct btrfs_io_stripe smap = { 0 }; 732 struct bio_vec bvec; 733 struct bio bio; 734 int ret = 0; 735 736 ASSERT(!(fs_info->sb->s_flags & SB_RDONLY)); 737 BUG_ON(!mirror_num); 738 739 if (btrfs_repair_one_zone(fs_info, logical)) 740 return 0; 741 742 /* 743 * Avoid races with device replace and make sure our bioc has devices 744 * associated to its stripes that don't go away while we are doing the 745 * read repair operation. 746 */ 747 btrfs_bio_counter_inc_blocked(fs_info); 748 ret = btrfs_map_repair_block(fs_info, &smap, logical, length, mirror_num); 749 if (ret < 0) 750 goto out_counter_dec; 751 752 if (!smap.dev->bdev || 753 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &smap.dev->dev_state)) { 754 ret = -EIO; 755 goto out_counter_dec; 756 } 757 758 bio_init(&bio, smap.dev->bdev, &bvec, 1, REQ_OP_WRITE | REQ_SYNC); 759 bio.bi_iter.bi_sector = smap.physical >> SECTOR_SHIFT; 760 __bio_add_page(&bio, page, length, pg_offset); 761 762 btrfsic_check_bio(&bio); 763 ret = submit_bio_wait(&bio); 764 if (ret) { 765 /* try to remap that extent elsewhere? */ 766 btrfs_dev_stat_inc_and_print(smap.dev, BTRFS_DEV_STAT_WRITE_ERRS); 767 goto out_bio_uninit; 768 } 769 770 btrfs_info_rl_in_rcu(fs_info, 771 "read error corrected: ino %llu off %llu (dev %s sector %llu)", 772 ino, start, btrfs_dev_name(smap.dev), 773 smap.physical >> SECTOR_SHIFT); 774 ret = 0; 775 776 out_bio_uninit: 777 bio_uninit(&bio); 778 out_counter_dec: 779 btrfs_bio_counter_dec(fs_info); 780 return ret; 781 } 782 783 /* 784 * Submit a btrfs_bio based repair write. 785 * 786 * If @dev_replace is true, the write would be submitted to dev-replace target. 787 */ 788 void btrfs_submit_repair_write(struct btrfs_bio *bbio, int mirror_num, bool dev_replace) 789 { 790 struct btrfs_fs_info *fs_info = bbio->fs_info; 791 u64 logical = bbio->bio.bi_iter.bi_sector << SECTOR_SHIFT; 792 u64 length = bbio->bio.bi_iter.bi_size; 793 struct btrfs_io_stripe smap = { 0 }; 794 int ret; 795 796 ASSERT(fs_info); 797 ASSERT(mirror_num > 0); 798 ASSERT(btrfs_op(&bbio->bio) == BTRFS_MAP_WRITE); 799 ASSERT(!bbio->inode); 800 801 btrfs_bio_counter_inc_blocked(fs_info); 802 ret = btrfs_map_repair_block(fs_info, &smap, logical, length, mirror_num); 803 if (ret < 0) 804 goto fail; 805 806 if (dev_replace) { 807 ASSERT(smap.dev == fs_info->dev_replace.srcdev); 808 smap.dev = fs_info->dev_replace.tgtdev; 809 } 810 __btrfs_submit_bio(&bbio->bio, NULL, &smap, mirror_num); 811 return; 812 813 fail: 814 btrfs_bio_counter_dec(fs_info); 815 btrfs_bio_end_io(bbio, errno_to_blk_status(ret)); 816 } 817 818 int __init btrfs_bioset_init(void) 819 { 820 if (bioset_init(&btrfs_bioset, BIO_POOL_SIZE, 821 offsetof(struct btrfs_bio, bio), 822 BIOSET_NEED_BVECS)) 823 return -ENOMEM; 824 if (bioset_init(&btrfs_clone_bioset, BIO_POOL_SIZE, 825 offsetof(struct btrfs_bio, bio), 0)) 826 goto out_free_bioset; 827 if (bioset_init(&btrfs_repair_bioset, BIO_POOL_SIZE, 828 offsetof(struct btrfs_bio, bio), 829 BIOSET_NEED_BVECS)) 830 goto out_free_clone_bioset; 831 if (mempool_init_kmalloc_pool(&btrfs_failed_bio_pool, BIO_POOL_SIZE, 832 sizeof(struct btrfs_failed_bio))) 833 goto out_free_repair_bioset; 834 return 0; 835 836 out_free_repair_bioset: 837 bioset_exit(&btrfs_repair_bioset); 838 out_free_clone_bioset: 839 bioset_exit(&btrfs_clone_bioset); 840 out_free_bioset: 841 bioset_exit(&btrfs_bioset); 842 return -ENOMEM; 843 } 844 845 void __cold btrfs_bioset_exit(void) 846 { 847 mempool_exit(&btrfs_failed_bio_pool); 848 bioset_exit(&btrfs_repair_bioset); 849 bioset_exit(&btrfs_clone_bioset); 850 bioset_exit(&btrfs_bioset); 851 } 852