1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) STRATO AG 2012. All rights reserved. 4 */ 5 6 #include <linux/sched.h> 7 #include <linux/bio.h> 8 #include <linux/slab.h> 9 #include <linux/blkdev.h> 10 #include <linux/kthread.h> 11 #include <linux/math64.h> 12 #include "misc.h" 13 #include "ctree.h" 14 #include "extent_map.h" 15 #include "disk-io.h" 16 #include "transaction.h" 17 #include "print-tree.h" 18 #include "volumes.h" 19 #include "async-thread.h" 20 #include "dev-replace.h" 21 #include "sysfs.h" 22 #include "zoned.h" 23 #include "block-group.h" 24 #include "fs.h" 25 #include "accessors.h" 26 #include "scrub.h" 27 28 /* 29 * Device replace overview 30 * 31 * [Objective] 32 * To copy all extents (both new and on-disk) from source device to target 33 * device, while still keeping the filesystem read-write. 34 * 35 * [Method] 36 * There are two main methods involved: 37 * 38 * - Write duplication 39 * 40 * All new writes will be written to both target and source devices, so even 41 * if replace gets canceled, sources device still contains up-to-date data. 42 * 43 * Location: handle_ops_on_dev_replace() from btrfs_map_block() 44 * Start: btrfs_dev_replace_start() 45 * End: btrfs_dev_replace_finishing() 46 * Content: Latest data/metadata 47 * 48 * - Copy existing extents 49 * 50 * This happens by re-using scrub facility, as scrub also iterates through 51 * existing extents from commit root. 52 * 53 * Location: scrub_write_block_to_dev_replace() from 54 * scrub_block_complete() 55 * Content: Data/meta from commit root. 56 * 57 * Due to the content difference, we need to avoid nocow write when dev-replace 58 * is happening. This is done by marking the block group read-only and waiting 59 * for NOCOW writes. 60 * 61 * After replace is done, the finishing part is done by swapping the target and 62 * source devices. 63 * 64 * Location: btrfs_dev_replace_update_device_in_mapping_tree() from 65 * btrfs_dev_replace_finishing() 66 */ 67 68 static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, 69 int scrub_ret); 70 static int btrfs_dev_replace_kthread(void *data); 71 72 int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) 73 { 74 struct btrfs_dev_lookup_args args = { .devid = BTRFS_DEV_REPLACE_DEVID }; 75 struct btrfs_key key; 76 struct btrfs_root *dev_root = fs_info->dev_root; 77 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; 78 struct extent_buffer *eb; 79 int slot; 80 int ret = 0; 81 struct btrfs_path *path = NULL; 82 int item_size; 83 struct btrfs_dev_replace_item *ptr; 84 u64 src_devid; 85 86 if (!dev_root) 87 return 0; 88 89 path = btrfs_alloc_path(); 90 if (!path) { 91 ret = -ENOMEM; 92 goto out; 93 } 94 95 key.objectid = 0; 96 key.type = BTRFS_DEV_REPLACE_KEY; 97 key.offset = 0; 98 ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); 99 if (ret) { 100 no_valid_dev_replace_entry_found: 101 /* 102 * We don't have a replace item or it's corrupted. If there is 103 * a replace target, fail the mount. 104 */ 105 if (btrfs_find_device(fs_info->fs_devices, &args)) { 106 btrfs_err(fs_info, 107 "found replace target device without a valid replace item"); 108 ret = -EUCLEAN; 109 goto out; 110 } 111 ret = 0; 112 dev_replace->replace_state = 113 BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; 114 dev_replace->cont_reading_from_srcdev_mode = 115 BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; 116 dev_replace->time_started = 0; 117 dev_replace->time_stopped = 0; 118 atomic64_set(&dev_replace->num_write_errors, 0); 119 atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); 120 dev_replace->cursor_left = 0; 121 dev_replace->committed_cursor_left = 0; 122 dev_replace->cursor_left_last_write_of_item = 0; 123 dev_replace->cursor_right = 0; 124 dev_replace->srcdev = NULL; 125 dev_replace->tgtdev = NULL; 126 dev_replace->is_valid = 0; 127 dev_replace->item_needs_writeback = 0; 128 goto out; 129 } 130 slot = path->slots[0]; 131 eb = path->nodes[0]; 132 item_size = btrfs_item_size(eb, slot); 133 ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); 134 135 if (item_size != sizeof(struct btrfs_dev_replace_item)) { 136 btrfs_warn(fs_info, 137 "dev_replace entry found has unexpected size, ignore entry"); 138 goto no_valid_dev_replace_entry_found; 139 } 140 141 src_devid = btrfs_dev_replace_src_devid(eb, ptr); 142 dev_replace->cont_reading_from_srcdev_mode = 143 btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr); 144 dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr); 145 dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr); 146 dev_replace->time_stopped = 147 btrfs_dev_replace_time_stopped(eb, ptr); 148 atomic64_set(&dev_replace->num_write_errors, 149 btrfs_dev_replace_num_write_errors(eb, ptr)); 150 atomic64_set(&dev_replace->num_uncorrectable_read_errors, 151 btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr)); 152 dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr); 153 dev_replace->committed_cursor_left = dev_replace->cursor_left; 154 dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; 155 dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr); 156 dev_replace->is_valid = 1; 157 158 dev_replace->item_needs_writeback = 0; 159 switch (dev_replace->replace_state) { 160 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: 161 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: 162 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: 163 /* 164 * We don't have an active replace item but if there is a 165 * replace target, fail the mount. 166 */ 167 if (btrfs_find_device(fs_info->fs_devices, &args)) { 168 btrfs_err(fs_info, 169 "replace without active item, run 'device scan --forget' on the target device"); 170 ret = -EUCLEAN; 171 } else { 172 dev_replace->srcdev = NULL; 173 dev_replace->tgtdev = NULL; 174 } 175 break; 176 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: 177 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: 178 dev_replace->tgtdev = btrfs_find_device(fs_info->fs_devices, &args); 179 args.devid = src_devid; 180 dev_replace->srcdev = btrfs_find_device(fs_info->fs_devices, &args); 181 182 /* 183 * allow 'btrfs dev replace_cancel' if src/tgt device is 184 * missing 185 */ 186 if (!dev_replace->srcdev && 187 !btrfs_test_opt(fs_info, DEGRADED)) { 188 ret = -EIO; 189 btrfs_warn(fs_info, 190 "cannot mount because device replace operation is ongoing and"); 191 btrfs_warn(fs_info, 192 "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?", 193 src_devid); 194 } 195 if (!dev_replace->tgtdev && 196 !btrfs_test_opt(fs_info, DEGRADED)) { 197 ret = -EIO; 198 btrfs_warn(fs_info, 199 "cannot mount because device replace operation is ongoing and"); 200 btrfs_warn(fs_info, 201 "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?", 202 BTRFS_DEV_REPLACE_DEVID); 203 } 204 if (dev_replace->tgtdev) { 205 if (dev_replace->srcdev) { 206 dev_replace->tgtdev->total_bytes = 207 dev_replace->srcdev->total_bytes; 208 dev_replace->tgtdev->disk_total_bytes = 209 dev_replace->srcdev->disk_total_bytes; 210 dev_replace->tgtdev->commit_total_bytes = 211 dev_replace->srcdev->commit_total_bytes; 212 dev_replace->tgtdev->bytes_used = 213 dev_replace->srcdev->bytes_used; 214 dev_replace->tgtdev->commit_bytes_used = 215 dev_replace->srcdev->commit_bytes_used; 216 } 217 set_bit(BTRFS_DEV_STATE_REPLACE_TGT, 218 &dev_replace->tgtdev->dev_state); 219 220 WARN_ON(fs_info->fs_devices->rw_devices == 0); 221 dev_replace->tgtdev->io_width = fs_info->sectorsize; 222 dev_replace->tgtdev->io_align = fs_info->sectorsize; 223 dev_replace->tgtdev->sector_size = fs_info->sectorsize; 224 dev_replace->tgtdev->fs_info = fs_info; 225 set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, 226 &dev_replace->tgtdev->dev_state); 227 } 228 break; 229 } 230 231 out: 232 btrfs_free_path(path); 233 return ret; 234 } 235 236 /* 237 * Initialize a new device for device replace target from a given source dev 238 * and path. 239 * 240 * Return 0 and new device in @device_out, otherwise return < 0 241 */ 242 static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, 243 const char *device_path, 244 struct btrfs_device *srcdev, 245 struct btrfs_device **device_out) 246 { 247 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 248 struct btrfs_device *device; 249 struct bdev_handle *bdev_handle; 250 struct block_device *bdev; 251 u64 devid = BTRFS_DEV_REPLACE_DEVID; 252 int ret = 0; 253 254 *device_out = NULL; 255 if (srcdev->fs_devices->seeding) { 256 btrfs_err(fs_info, "the filesystem is a seed filesystem!"); 257 return -EINVAL; 258 } 259 260 bdev_handle = bdev_open_by_path(device_path, BLK_OPEN_WRITE, 261 fs_info->bdev_holder, NULL); 262 if (IS_ERR(bdev_handle)) { 263 btrfs_err(fs_info, "target device %s is invalid!", device_path); 264 return PTR_ERR(bdev_handle); 265 } 266 bdev = bdev_handle->bdev; 267 268 if (!btrfs_check_device_zone_type(fs_info, bdev)) { 269 btrfs_err(fs_info, 270 "dev-replace: zoned type of target device mismatch with filesystem"); 271 ret = -EINVAL; 272 goto error; 273 } 274 275 sync_blockdev(bdev); 276 277 list_for_each_entry(device, &fs_devices->devices, dev_list) { 278 if (device->bdev == bdev) { 279 btrfs_err(fs_info, 280 "target device is in the filesystem!"); 281 ret = -EEXIST; 282 goto error; 283 } 284 } 285 286 287 if (bdev_nr_bytes(bdev) < btrfs_device_get_total_bytes(srcdev)) { 288 btrfs_err(fs_info, 289 "target device is smaller than source device!"); 290 ret = -EINVAL; 291 goto error; 292 } 293 294 295 device = btrfs_alloc_device(NULL, &devid, NULL, device_path); 296 if (IS_ERR(device)) { 297 ret = PTR_ERR(device); 298 goto error; 299 } 300 301 ret = lookup_bdev(device_path, &device->devt); 302 if (ret) 303 goto error; 304 305 set_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); 306 device->generation = 0; 307 device->io_width = fs_info->sectorsize; 308 device->io_align = fs_info->sectorsize; 309 device->sector_size = fs_info->sectorsize; 310 device->total_bytes = btrfs_device_get_total_bytes(srcdev); 311 device->disk_total_bytes = btrfs_device_get_disk_total_bytes(srcdev); 312 device->bytes_used = btrfs_device_get_bytes_used(srcdev); 313 device->commit_total_bytes = srcdev->commit_total_bytes; 314 device->commit_bytes_used = device->bytes_used; 315 device->fs_info = fs_info; 316 device->bdev = bdev; 317 device->bdev_handle = bdev_handle; 318 set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); 319 set_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); 320 device->dev_stats_valid = 1; 321 set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE); 322 device->fs_devices = fs_devices; 323 324 ret = btrfs_get_dev_zone_info(device, false); 325 if (ret) 326 goto error; 327 328 mutex_lock(&fs_devices->device_list_mutex); 329 list_add(&device->dev_list, &fs_devices->devices); 330 fs_devices->num_devices++; 331 fs_devices->open_devices++; 332 mutex_unlock(&fs_devices->device_list_mutex); 333 334 *device_out = device; 335 return 0; 336 337 error: 338 bdev_release(bdev_handle); 339 return ret; 340 } 341 342 /* 343 * called from commit_transaction. Writes changed device replace state to 344 * disk. 345 */ 346 int btrfs_run_dev_replace(struct btrfs_trans_handle *trans) 347 { 348 struct btrfs_fs_info *fs_info = trans->fs_info; 349 int ret; 350 struct btrfs_root *dev_root = fs_info->dev_root; 351 struct btrfs_path *path; 352 struct btrfs_key key; 353 struct extent_buffer *eb; 354 struct btrfs_dev_replace_item *ptr; 355 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; 356 357 down_read(&dev_replace->rwsem); 358 if (!dev_replace->is_valid || 359 !dev_replace->item_needs_writeback) { 360 up_read(&dev_replace->rwsem); 361 return 0; 362 } 363 up_read(&dev_replace->rwsem); 364 365 key.objectid = 0; 366 key.type = BTRFS_DEV_REPLACE_KEY; 367 key.offset = 0; 368 369 path = btrfs_alloc_path(); 370 if (!path) { 371 ret = -ENOMEM; 372 goto out; 373 } 374 ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); 375 if (ret < 0) { 376 btrfs_warn(fs_info, 377 "error %d while searching for dev_replace item!", 378 ret); 379 goto out; 380 } 381 382 if (ret == 0 && 383 btrfs_item_size(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { 384 /* 385 * need to delete old one and insert a new one. 386 * Since no attempt is made to recover any old state, if the 387 * dev_replace state is 'running', the data on the target 388 * drive is lost. 389 * It would be possible to recover the state: just make sure 390 * that the beginning of the item is never changed and always 391 * contains all the essential information. Then read this 392 * minimal set of information and use it as a base for the 393 * new state. 394 */ 395 ret = btrfs_del_item(trans, dev_root, path); 396 if (ret != 0) { 397 btrfs_warn(fs_info, 398 "delete too small dev_replace item failed %d!", 399 ret); 400 goto out; 401 } 402 ret = 1; 403 } 404 405 if (ret == 1) { 406 /* need to insert a new item */ 407 btrfs_release_path(path); 408 ret = btrfs_insert_empty_item(trans, dev_root, path, 409 &key, sizeof(*ptr)); 410 if (ret < 0) { 411 btrfs_warn(fs_info, 412 "insert dev_replace item failed %d!", ret); 413 goto out; 414 } 415 } 416 417 eb = path->nodes[0]; 418 ptr = btrfs_item_ptr(eb, path->slots[0], 419 struct btrfs_dev_replace_item); 420 421 down_write(&dev_replace->rwsem); 422 if (dev_replace->srcdev) 423 btrfs_set_dev_replace_src_devid(eb, ptr, 424 dev_replace->srcdev->devid); 425 else 426 btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1); 427 btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr, 428 dev_replace->cont_reading_from_srcdev_mode); 429 btrfs_set_dev_replace_replace_state(eb, ptr, 430 dev_replace->replace_state); 431 btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started); 432 btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped); 433 btrfs_set_dev_replace_num_write_errors(eb, ptr, 434 atomic64_read(&dev_replace->num_write_errors)); 435 btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr, 436 atomic64_read(&dev_replace->num_uncorrectable_read_errors)); 437 dev_replace->cursor_left_last_write_of_item = 438 dev_replace->cursor_left; 439 btrfs_set_dev_replace_cursor_left(eb, ptr, 440 dev_replace->cursor_left_last_write_of_item); 441 btrfs_set_dev_replace_cursor_right(eb, ptr, 442 dev_replace->cursor_right); 443 dev_replace->item_needs_writeback = 0; 444 up_write(&dev_replace->rwsem); 445 446 btrfs_mark_buffer_dirty(trans, eb); 447 448 out: 449 btrfs_free_path(path); 450 451 return ret; 452 } 453 454 static int mark_block_group_to_copy(struct btrfs_fs_info *fs_info, 455 struct btrfs_device *src_dev) 456 { 457 struct btrfs_path *path; 458 struct btrfs_key key; 459 struct btrfs_key found_key; 460 struct btrfs_root *root = fs_info->dev_root; 461 struct btrfs_dev_extent *dev_extent = NULL; 462 struct btrfs_block_group *cache; 463 struct btrfs_trans_handle *trans; 464 int iter_ret = 0; 465 int ret = 0; 466 u64 chunk_offset; 467 468 /* Do not use "to_copy" on non zoned filesystem for now */ 469 if (!btrfs_is_zoned(fs_info)) 470 return 0; 471 472 mutex_lock(&fs_info->chunk_mutex); 473 474 /* Ensure we don't have pending new block group */ 475 spin_lock(&fs_info->trans_lock); 476 while (fs_info->running_transaction && 477 !list_empty(&fs_info->running_transaction->dev_update_list)) { 478 spin_unlock(&fs_info->trans_lock); 479 mutex_unlock(&fs_info->chunk_mutex); 480 trans = btrfs_attach_transaction(root); 481 if (IS_ERR(trans)) { 482 ret = PTR_ERR(trans); 483 mutex_lock(&fs_info->chunk_mutex); 484 if (ret == -ENOENT) { 485 spin_lock(&fs_info->trans_lock); 486 continue; 487 } else { 488 goto unlock; 489 } 490 } 491 492 ret = btrfs_commit_transaction(trans); 493 mutex_lock(&fs_info->chunk_mutex); 494 if (ret) 495 goto unlock; 496 497 spin_lock(&fs_info->trans_lock); 498 } 499 spin_unlock(&fs_info->trans_lock); 500 501 path = btrfs_alloc_path(); 502 if (!path) { 503 ret = -ENOMEM; 504 goto unlock; 505 } 506 507 path->reada = READA_FORWARD; 508 path->search_commit_root = 1; 509 path->skip_locking = 1; 510 511 key.objectid = src_dev->devid; 512 key.type = BTRFS_DEV_EXTENT_KEY; 513 key.offset = 0; 514 515 btrfs_for_each_slot(root, &key, &found_key, path, iter_ret) { 516 struct extent_buffer *leaf = path->nodes[0]; 517 518 if (found_key.objectid != src_dev->devid) 519 break; 520 521 if (found_key.type != BTRFS_DEV_EXTENT_KEY) 522 break; 523 524 if (found_key.offset < key.offset) 525 break; 526 527 dev_extent = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent); 528 529 chunk_offset = btrfs_dev_extent_chunk_offset(leaf, dev_extent); 530 531 cache = btrfs_lookup_block_group(fs_info, chunk_offset); 532 if (!cache) 533 continue; 534 535 set_bit(BLOCK_GROUP_FLAG_TO_COPY, &cache->runtime_flags); 536 btrfs_put_block_group(cache); 537 } 538 if (iter_ret < 0) 539 ret = iter_ret; 540 541 btrfs_free_path(path); 542 unlock: 543 mutex_unlock(&fs_info->chunk_mutex); 544 545 return ret; 546 } 547 548 bool btrfs_finish_block_group_to_copy(struct btrfs_device *srcdev, 549 struct btrfs_block_group *cache, 550 u64 physical) 551 { 552 struct btrfs_fs_info *fs_info = cache->fs_info; 553 struct btrfs_chunk_map *map; 554 u64 chunk_offset = cache->start; 555 int num_extents, cur_extent; 556 int i; 557 558 /* Do not use "to_copy" on non zoned filesystem for now */ 559 if (!btrfs_is_zoned(fs_info)) 560 return true; 561 562 spin_lock(&cache->lock); 563 if (test_bit(BLOCK_GROUP_FLAG_REMOVED, &cache->runtime_flags)) { 564 spin_unlock(&cache->lock); 565 return true; 566 } 567 spin_unlock(&cache->lock); 568 569 map = btrfs_get_chunk_map(fs_info, chunk_offset, 1); 570 ASSERT(!IS_ERR(map)); 571 572 num_extents = 0; 573 cur_extent = 0; 574 for (i = 0; i < map->num_stripes; i++) { 575 /* We have more device extent to copy */ 576 if (srcdev != map->stripes[i].dev) 577 continue; 578 579 num_extents++; 580 if (physical == map->stripes[i].physical) 581 cur_extent = i; 582 } 583 584 btrfs_free_chunk_map(map); 585 586 if (num_extents > 1 && cur_extent < num_extents - 1) { 587 /* 588 * Has more stripes on this device. Keep this block group 589 * readonly until we finish all the stripes. 590 */ 591 return false; 592 } 593 594 /* Last stripe on this device */ 595 clear_bit(BLOCK_GROUP_FLAG_TO_COPY, &cache->runtime_flags); 596 597 return true; 598 } 599 600 static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info, 601 const char *tgtdev_name, u64 srcdevid, const char *srcdev_name, 602 int read_src) 603 { 604 struct btrfs_root *root = fs_info->dev_root; 605 struct btrfs_trans_handle *trans; 606 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; 607 int ret; 608 struct btrfs_device *tgt_device = NULL; 609 struct btrfs_device *src_device = NULL; 610 611 src_device = btrfs_find_device_by_devspec(fs_info, srcdevid, 612 srcdev_name); 613 if (IS_ERR(src_device)) 614 return PTR_ERR(src_device); 615 616 if (btrfs_pinned_by_swapfile(fs_info, src_device)) { 617 btrfs_warn_in_rcu(fs_info, 618 "cannot replace device %s (devid %llu) due to active swapfile", 619 btrfs_dev_name(src_device), src_device->devid); 620 return -ETXTBSY; 621 } 622 623 /* 624 * Here we commit the transaction to make sure commit_total_bytes 625 * of all the devices are updated. 626 */ 627 trans = btrfs_attach_transaction(root); 628 if (!IS_ERR(trans)) { 629 ret = btrfs_commit_transaction(trans); 630 if (ret) 631 return ret; 632 } else if (PTR_ERR(trans) != -ENOENT) { 633 return PTR_ERR(trans); 634 } 635 636 ret = btrfs_init_dev_replace_tgtdev(fs_info, tgtdev_name, 637 src_device, &tgt_device); 638 if (ret) 639 return ret; 640 641 ret = mark_block_group_to_copy(fs_info, src_device); 642 if (ret) 643 return ret; 644 645 down_write(&dev_replace->rwsem); 646 switch (dev_replace->replace_state) { 647 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: 648 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: 649 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: 650 break; 651 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: 652 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: 653 ASSERT(0); 654 ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; 655 up_write(&dev_replace->rwsem); 656 goto leave; 657 } 658 659 dev_replace->cont_reading_from_srcdev_mode = read_src; 660 dev_replace->srcdev = src_device; 661 dev_replace->tgtdev = tgt_device; 662 663 btrfs_info_in_rcu(fs_info, 664 "dev_replace from %s (devid %llu) to %s started", 665 btrfs_dev_name(src_device), 666 src_device->devid, 667 btrfs_dev_name(tgt_device)); 668 669 /* 670 * from now on, the writes to the srcdev are all duplicated to 671 * go to the tgtdev as well (refer to btrfs_map_block()). 672 */ 673 dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; 674 dev_replace->time_started = ktime_get_real_seconds(); 675 dev_replace->cursor_left = 0; 676 dev_replace->committed_cursor_left = 0; 677 dev_replace->cursor_left_last_write_of_item = 0; 678 dev_replace->cursor_right = 0; 679 dev_replace->is_valid = 1; 680 dev_replace->item_needs_writeback = 1; 681 atomic64_set(&dev_replace->num_write_errors, 0); 682 atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); 683 up_write(&dev_replace->rwsem); 684 685 ret = btrfs_sysfs_add_device(tgt_device); 686 if (ret) 687 btrfs_err(fs_info, "kobj add dev failed %d", ret); 688 689 btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); 690 691 /* 692 * Commit dev_replace state and reserve 1 item for it. 693 * This is crucial to ensure we won't miss copying extents for new block 694 * groups that are allocated after we started the device replace, and 695 * must be done after setting up the device replace state. 696 */ 697 trans = btrfs_start_transaction(root, 1); 698 if (IS_ERR(trans)) { 699 ret = PTR_ERR(trans); 700 down_write(&dev_replace->rwsem); 701 dev_replace->replace_state = 702 BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; 703 dev_replace->srcdev = NULL; 704 dev_replace->tgtdev = NULL; 705 up_write(&dev_replace->rwsem); 706 goto leave; 707 } 708 709 ret = btrfs_commit_transaction(trans); 710 WARN_ON(ret); 711 712 /* the disk copy procedure reuses the scrub code */ 713 ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, 714 btrfs_device_get_total_bytes(src_device), 715 &dev_replace->scrub_progress, 0, 1); 716 717 ret = btrfs_dev_replace_finishing(fs_info, ret); 718 if (ret == -EINPROGRESS) 719 ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; 720 721 return ret; 722 723 leave: 724 btrfs_destroy_dev_replace_tgtdev(tgt_device); 725 return ret; 726 } 727 728 int btrfs_dev_replace_by_ioctl(struct btrfs_fs_info *fs_info, 729 struct btrfs_ioctl_dev_replace_args *args) 730 { 731 int ret; 732 733 switch (args->start.cont_reading_from_srcdev_mode) { 734 case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: 735 case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: 736 break; 737 default: 738 return -EINVAL; 739 } 740 741 if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || 742 args->start.tgtdev_name[0] == '\0') 743 return -EINVAL; 744 745 ret = btrfs_dev_replace_start(fs_info, args->start.tgtdev_name, 746 args->start.srcdevid, 747 args->start.srcdev_name, 748 args->start.cont_reading_from_srcdev_mode); 749 args->result = ret; 750 /* don't warn if EINPROGRESS, someone else might be running scrub */ 751 if (ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS || 752 ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR) 753 return 0; 754 755 return ret; 756 } 757 758 /* 759 * blocked until all in-flight bios operations are finished. 760 */ 761 static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) 762 { 763 set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); 764 wait_event(fs_info->dev_replace.replace_wait, !percpu_counter_sum( 765 &fs_info->dev_replace.bio_counter)); 766 } 767 768 /* 769 * we have removed target device, it is safe to allow new bios request. 770 */ 771 static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) 772 { 773 clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); 774 wake_up(&fs_info->dev_replace.replace_wait); 775 } 776 777 /* 778 * When finishing the device replace, before swapping the source device with the 779 * target device we must update the chunk allocation state in the target device, 780 * as it is empty because replace works by directly copying the chunks and not 781 * through the normal chunk allocation path. 782 */ 783 static int btrfs_set_target_alloc_state(struct btrfs_device *srcdev, 784 struct btrfs_device *tgtdev) 785 { 786 struct extent_state *cached_state = NULL; 787 u64 start = 0; 788 u64 found_start; 789 u64 found_end; 790 int ret = 0; 791 792 lockdep_assert_held(&srcdev->fs_info->chunk_mutex); 793 794 while (find_first_extent_bit(&srcdev->alloc_state, start, 795 &found_start, &found_end, 796 CHUNK_ALLOCATED, &cached_state)) { 797 ret = set_extent_bit(&tgtdev->alloc_state, found_start, 798 found_end, CHUNK_ALLOCATED, NULL); 799 if (ret) 800 break; 801 start = found_end + 1; 802 } 803 804 free_extent_state(cached_state); 805 return ret; 806 } 807 808 static void btrfs_dev_replace_update_device_in_mapping_tree( 809 struct btrfs_fs_info *fs_info, 810 struct btrfs_device *srcdev, 811 struct btrfs_device *tgtdev) 812 { 813 u64 start = 0; 814 int i; 815 816 write_lock(&fs_info->mapping_tree_lock); 817 do { 818 struct btrfs_chunk_map *map; 819 820 map = btrfs_find_chunk_map_nolock(fs_info, start, U64_MAX); 821 if (!map) 822 break; 823 for (i = 0; i < map->num_stripes; i++) 824 if (srcdev == map->stripes[i].dev) 825 map->stripes[i].dev = tgtdev; 826 start = map->start + map->chunk_len; 827 btrfs_free_chunk_map(map); 828 } while (start); 829 write_unlock(&fs_info->mapping_tree_lock); 830 } 831 832 static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, 833 int scrub_ret) 834 { 835 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; 836 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 837 struct btrfs_device *tgt_device; 838 struct btrfs_device *src_device; 839 struct btrfs_root *root = fs_info->tree_root; 840 u8 uuid_tmp[BTRFS_UUID_SIZE]; 841 struct btrfs_trans_handle *trans; 842 int ret = 0; 843 844 /* don't allow cancel or unmount to disturb the finishing procedure */ 845 mutex_lock(&dev_replace->lock_finishing_cancel_unmount); 846 847 down_read(&dev_replace->rwsem); 848 /* was the operation canceled, or is it finished? */ 849 if (dev_replace->replace_state != 850 BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { 851 up_read(&dev_replace->rwsem); 852 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); 853 return 0; 854 } 855 856 tgt_device = dev_replace->tgtdev; 857 src_device = dev_replace->srcdev; 858 up_read(&dev_replace->rwsem); 859 860 /* 861 * flush all outstanding I/O and inode extent mappings before the 862 * copy operation is declared as being finished 863 */ 864 ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 865 if (ret) { 866 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); 867 return ret; 868 } 869 btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); 870 871 /* 872 * We have to use this loop approach because at this point src_device 873 * has to be available for transaction commit to complete, yet new 874 * chunks shouldn't be allocated on the device. 875 */ 876 while (1) { 877 trans = btrfs_start_transaction(root, 0); 878 if (IS_ERR(trans)) { 879 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); 880 return PTR_ERR(trans); 881 } 882 ret = btrfs_commit_transaction(trans); 883 WARN_ON(ret); 884 885 /* Prevent write_all_supers() during the finishing procedure */ 886 mutex_lock(&fs_devices->device_list_mutex); 887 /* Prevent new chunks being allocated on the source device */ 888 mutex_lock(&fs_info->chunk_mutex); 889 890 if (!list_empty(&src_device->post_commit_list)) { 891 mutex_unlock(&fs_devices->device_list_mutex); 892 mutex_unlock(&fs_info->chunk_mutex); 893 } else { 894 break; 895 } 896 } 897 898 down_write(&dev_replace->rwsem); 899 dev_replace->replace_state = 900 scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED 901 : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; 902 dev_replace->tgtdev = NULL; 903 dev_replace->srcdev = NULL; 904 dev_replace->time_stopped = ktime_get_real_seconds(); 905 dev_replace->item_needs_writeback = 1; 906 907 /* 908 * Update allocation state in the new device and replace the old device 909 * with the new one in the mapping tree. 910 */ 911 if (!scrub_ret) { 912 scrub_ret = btrfs_set_target_alloc_state(src_device, tgt_device); 913 if (scrub_ret) 914 goto error; 915 btrfs_dev_replace_update_device_in_mapping_tree(fs_info, 916 src_device, 917 tgt_device); 918 } else { 919 if (scrub_ret != -ECANCELED) 920 btrfs_err_in_rcu(fs_info, 921 "btrfs_scrub_dev(%s, %llu, %s) failed %d", 922 btrfs_dev_name(src_device), 923 src_device->devid, 924 btrfs_dev_name(tgt_device), scrub_ret); 925 error: 926 up_write(&dev_replace->rwsem); 927 mutex_unlock(&fs_info->chunk_mutex); 928 mutex_unlock(&fs_devices->device_list_mutex); 929 btrfs_rm_dev_replace_blocked(fs_info); 930 if (tgt_device) 931 btrfs_destroy_dev_replace_tgtdev(tgt_device); 932 btrfs_rm_dev_replace_unblocked(fs_info); 933 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); 934 935 return scrub_ret; 936 } 937 938 btrfs_info_in_rcu(fs_info, 939 "dev_replace from %s (devid %llu) to %s finished", 940 btrfs_dev_name(src_device), 941 src_device->devid, 942 btrfs_dev_name(tgt_device)); 943 clear_bit(BTRFS_DEV_STATE_REPLACE_TGT, &tgt_device->dev_state); 944 tgt_device->devid = src_device->devid; 945 src_device->devid = BTRFS_DEV_REPLACE_DEVID; 946 memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); 947 memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); 948 memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); 949 btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes); 950 btrfs_device_set_disk_total_bytes(tgt_device, 951 src_device->disk_total_bytes); 952 btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used); 953 tgt_device->commit_bytes_used = src_device->bytes_used; 954 955 btrfs_assign_next_active_device(src_device, tgt_device); 956 957 list_add(&tgt_device->dev_alloc_list, &fs_devices->alloc_list); 958 fs_devices->rw_devices++; 959 960 up_write(&dev_replace->rwsem); 961 btrfs_rm_dev_replace_blocked(fs_info); 962 963 btrfs_rm_dev_replace_remove_srcdev(src_device); 964 965 btrfs_rm_dev_replace_unblocked(fs_info); 966 967 /* 968 * Increment dev_stats_ccnt so that btrfs_run_dev_stats() will 969 * update on-disk dev stats value during commit transaction 970 */ 971 atomic_inc(&tgt_device->dev_stats_ccnt); 972 973 /* 974 * this is again a consistent state where no dev_replace procedure 975 * is running, the target device is part of the filesystem, the 976 * source device is not part of the filesystem anymore and its 1st 977 * superblock is scratched out so that it is no longer marked to 978 * belong to this filesystem. 979 */ 980 mutex_unlock(&fs_info->chunk_mutex); 981 mutex_unlock(&fs_devices->device_list_mutex); 982 983 /* replace the sysfs entry */ 984 btrfs_sysfs_remove_device(src_device); 985 btrfs_sysfs_update_devid(tgt_device); 986 if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &src_device->dev_state)) 987 btrfs_scratch_superblocks(fs_info, src_device->bdev, 988 src_device->name->str); 989 990 /* write back the superblocks */ 991 trans = btrfs_start_transaction(root, 0); 992 if (!IS_ERR(trans)) 993 btrfs_commit_transaction(trans); 994 995 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); 996 997 btrfs_rm_dev_replace_free_srcdev(src_device); 998 999 return 0; 1000 } 1001 1002 /* 1003 * Read progress of device replace status according to the state and last 1004 * stored position. The value format is the same as for 1005 * btrfs_dev_replace::progress_1000 1006 */ 1007 static u64 btrfs_dev_replace_progress(struct btrfs_fs_info *fs_info) 1008 { 1009 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; 1010 u64 ret = 0; 1011 1012 switch (dev_replace->replace_state) { 1013 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: 1014 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: 1015 ret = 0; 1016 break; 1017 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: 1018 ret = 1000; 1019 break; 1020 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: 1021 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: 1022 ret = div64_u64(dev_replace->cursor_left, 1023 div_u64(btrfs_device_get_total_bytes( 1024 dev_replace->srcdev), 1000)); 1025 break; 1026 } 1027 1028 return ret; 1029 } 1030 1031 void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, 1032 struct btrfs_ioctl_dev_replace_args *args) 1033 { 1034 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; 1035 1036 down_read(&dev_replace->rwsem); 1037 /* even if !dev_replace_is_valid, the values are good enough for 1038 * the replace_status ioctl */ 1039 args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; 1040 args->status.replace_state = dev_replace->replace_state; 1041 args->status.time_started = dev_replace->time_started; 1042 args->status.time_stopped = dev_replace->time_stopped; 1043 args->status.num_write_errors = 1044 atomic64_read(&dev_replace->num_write_errors); 1045 args->status.num_uncorrectable_read_errors = 1046 atomic64_read(&dev_replace->num_uncorrectable_read_errors); 1047 args->status.progress_1000 = btrfs_dev_replace_progress(fs_info); 1048 up_read(&dev_replace->rwsem); 1049 } 1050 1051 int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) 1052 { 1053 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; 1054 struct btrfs_device *tgt_device = NULL; 1055 struct btrfs_device *src_device = NULL; 1056 struct btrfs_trans_handle *trans; 1057 struct btrfs_root *root = fs_info->tree_root; 1058 int result; 1059 int ret; 1060 1061 if (sb_rdonly(fs_info->sb)) 1062 return -EROFS; 1063 1064 mutex_lock(&dev_replace->lock_finishing_cancel_unmount); 1065 down_write(&dev_replace->rwsem); 1066 switch (dev_replace->replace_state) { 1067 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: 1068 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: 1069 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: 1070 result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; 1071 up_write(&dev_replace->rwsem); 1072 break; 1073 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: 1074 tgt_device = dev_replace->tgtdev; 1075 src_device = dev_replace->srcdev; 1076 up_write(&dev_replace->rwsem); 1077 ret = btrfs_scrub_cancel(fs_info); 1078 if (ret < 0) { 1079 result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; 1080 } else { 1081 result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; 1082 /* 1083 * btrfs_dev_replace_finishing() will handle the 1084 * cleanup part 1085 */ 1086 btrfs_info_in_rcu(fs_info, 1087 "dev_replace from %s (devid %llu) to %s canceled", 1088 btrfs_dev_name(src_device), src_device->devid, 1089 btrfs_dev_name(tgt_device)); 1090 } 1091 break; 1092 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: 1093 /* 1094 * Scrub doing the replace isn't running so we need to do the 1095 * cleanup step of btrfs_dev_replace_finishing() here 1096 */ 1097 result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; 1098 tgt_device = dev_replace->tgtdev; 1099 src_device = dev_replace->srcdev; 1100 dev_replace->tgtdev = NULL; 1101 dev_replace->srcdev = NULL; 1102 dev_replace->replace_state = 1103 BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; 1104 dev_replace->time_stopped = ktime_get_real_seconds(); 1105 dev_replace->item_needs_writeback = 1; 1106 1107 up_write(&dev_replace->rwsem); 1108 1109 /* Scrub for replace must not be running in suspended state */ 1110 btrfs_scrub_cancel(fs_info); 1111 1112 trans = btrfs_start_transaction(root, 0); 1113 if (IS_ERR(trans)) { 1114 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); 1115 return PTR_ERR(trans); 1116 } 1117 ret = btrfs_commit_transaction(trans); 1118 WARN_ON(ret); 1119 1120 btrfs_info_in_rcu(fs_info, 1121 "suspended dev_replace from %s (devid %llu) to %s canceled", 1122 btrfs_dev_name(src_device), src_device->devid, 1123 btrfs_dev_name(tgt_device)); 1124 1125 if (tgt_device) 1126 btrfs_destroy_dev_replace_tgtdev(tgt_device); 1127 break; 1128 default: 1129 up_write(&dev_replace->rwsem); 1130 result = -EINVAL; 1131 } 1132 1133 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); 1134 return result; 1135 } 1136 1137 void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) 1138 { 1139 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; 1140 1141 mutex_lock(&dev_replace->lock_finishing_cancel_unmount); 1142 down_write(&dev_replace->rwsem); 1143 1144 switch (dev_replace->replace_state) { 1145 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: 1146 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: 1147 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: 1148 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: 1149 break; 1150 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: 1151 dev_replace->replace_state = 1152 BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; 1153 dev_replace->time_stopped = ktime_get_real_seconds(); 1154 dev_replace->item_needs_writeback = 1; 1155 btrfs_info(fs_info, "suspending dev_replace for unmount"); 1156 break; 1157 } 1158 1159 up_write(&dev_replace->rwsem); 1160 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); 1161 } 1162 1163 /* resume dev_replace procedure that was interrupted by unmount */ 1164 int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) 1165 { 1166 struct task_struct *task; 1167 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; 1168 1169 down_write(&dev_replace->rwsem); 1170 1171 switch (dev_replace->replace_state) { 1172 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: 1173 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: 1174 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: 1175 up_write(&dev_replace->rwsem); 1176 return 0; 1177 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: 1178 break; 1179 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: 1180 dev_replace->replace_state = 1181 BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; 1182 break; 1183 } 1184 if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { 1185 btrfs_info(fs_info, 1186 "cannot continue dev_replace, tgtdev is missing"); 1187 btrfs_info(fs_info, 1188 "you may cancel the operation after 'mount -o degraded'"); 1189 dev_replace->replace_state = 1190 BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; 1191 up_write(&dev_replace->rwsem); 1192 return 0; 1193 } 1194 up_write(&dev_replace->rwsem); 1195 1196 /* 1197 * This could collide with a paused balance, but the exclusive op logic 1198 * should never allow both to start and pause. We don't want to allow 1199 * dev-replace to start anyway. 1200 */ 1201 if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 1202 down_write(&dev_replace->rwsem); 1203 dev_replace->replace_state = 1204 BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; 1205 up_write(&dev_replace->rwsem); 1206 btrfs_info(fs_info, 1207 "cannot resume dev-replace, other exclusive operation running"); 1208 return 0; 1209 } 1210 1211 task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); 1212 return PTR_ERR_OR_ZERO(task); 1213 } 1214 1215 static int btrfs_dev_replace_kthread(void *data) 1216 { 1217 struct btrfs_fs_info *fs_info = data; 1218 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; 1219 u64 progress; 1220 int ret; 1221 1222 progress = btrfs_dev_replace_progress(fs_info); 1223 progress = div_u64(progress, 10); 1224 btrfs_info_in_rcu(fs_info, 1225 "continuing dev_replace from %s (devid %llu) to target %s @%u%%", 1226 btrfs_dev_name(dev_replace->srcdev), 1227 dev_replace->srcdev->devid, 1228 btrfs_dev_name(dev_replace->tgtdev), 1229 (unsigned int)progress); 1230 1231 ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, 1232 dev_replace->committed_cursor_left, 1233 btrfs_device_get_total_bytes(dev_replace->srcdev), 1234 &dev_replace->scrub_progress, 0, 1); 1235 ret = btrfs_dev_replace_finishing(fs_info, ret); 1236 WARN_ON(ret && ret != -ECANCELED); 1237 1238 btrfs_exclop_finish(fs_info); 1239 return 0; 1240 } 1241 1242 int __pure btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) 1243 { 1244 if (!dev_replace->is_valid) 1245 return 0; 1246 1247 switch (dev_replace->replace_state) { 1248 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: 1249 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: 1250 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: 1251 return 0; 1252 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: 1253 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: 1254 /* 1255 * return true even if tgtdev is missing (this is 1256 * something that can happen if the dev_replace 1257 * procedure is suspended by an umount and then 1258 * the tgtdev is missing (or "btrfs dev scan") was 1259 * not called and the filesystem is remounted 1260 * in degraded state. This does not stop the 1261 * dev_replace procedure. It needs to be canceled 1262 * manually if the cancellation is wanted. 1263 */ 1264 break; 1265 } 1266 return 1; 1267 } 1268 1269 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount) 1270 { 1271 percpu_counter_sub(&fs_info->dev_replace.bio_counter, amount); 1272 cond_wake_up_nomb(&fs_info->dev_replace.replace_wait); 1273 } 1274 1275 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) 1276 { 1277 while (1) { 1278 percpu_counter_inc(&fs_info->dev_replace.bio_counter); 1279 if (likely(!test_bit(BTRFS_FS_STATE_DEV_REPLACING, 1280 &fs_info->fs_state))) 1281 break; 1282 1283 btrfs_bio_counter_dec(fs_info); 1284 wait_event(fs_info->dev_replace.replace_wait, 1285 !test_bit(BTRFS_FS_STATE_DEV_REPLACING, 1286 &fs_info->fs_state)); 1287 } 1288 } 1289