2 * Copyright (C) STRATO AG 2012. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
18 #include <linux/sched.h>
19 #include <linux/bio.h>
20 #include <linux/slab.h>
21 #include <linux/buffer_head.h>
22 #include <linux/blkdev.h>
23 #include <linux/random.h>
24 #include <linux/iocontext.h>
25 #include <linux/capability.h>
26 #include <linux/kthread.h>
27 #include <linux/math64.h>
28 #include <asm/div64.h>
30 #include "extent_map.h"
32 #include "transaction.h"
33 #include "print-tree.h"
35 #include "async-thread.h"
36 #include "check-integrity.h"
37 #include "rcu-string.h"
38 #include "dev-replace.h"
40 static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
42 static void btrfs_dev_replace_update_device_in_mapping_tree(
43 struct btrfs_fs_info *fs_info,
44 struct btrfs_device *srcdev,
45 struct btrfs_device *tgtdev);
46 static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid,
48 struct btrfs_device **device);
49 static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info);
50 static int btrfs_dev_replace_kthread(void *data);
51 static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info);
54 int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info)
57 struct btrfs_root *dev_root = fs_info->dev_root;
58 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
59 struct extent_buffer *eb;
62 struct btrfs_path *path = NULL;
64 struct btrfs_dev_replace_item *ptr;
67 path = btrfs_alloc_path();
74 key.type = BTRFS_DEV_REPLACE_KEY;
76 ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0);
78 no_valid_dev_replace_entry_found:
80 dev_replace->replace_state =
81 BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED;
82 dev_replace->cont_reading_from_srcdev_mode =
83 BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS;
84 dev_replace->replace_state = 0;
85 dev_replace->time_started = 0;
86 dev_replace->time_stopped = 0;
87 atomic64_set(&dev_replace->num_write_errors, 0);
88 atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0);
89 dev_replace->cursor_left = 0;
90 dev_replace->committed_cursor_left = 0;
91 dev_replace->cursor_left_last_write_of_item = 0;
92 dev_replace->cursor_right = 0;
93 dev_replace->srcdev = NULL;
94 dev_replace->tgtdev = NULL;
95 dev_replace->is_valid = 0;
96 dev_replace->item_needs_writeback = 0;
99 slot = path->slots[0];
101 item_size = btrfs_item_size_nr(eb, slot);
102 ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item);
104 if (item_size != sizeof(struct btrfs_dev_replace_item)) {
106 "dev_replace entry found has unexpected size, ignore entry");
107 goto no_valid_dev_replace_entry_found;
110 src_devid = btrfs_dev_replace_src_devid(eb, ptr);
111 dev_replace->cont_reading_from_srcdev_mode =
112 btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr);
113 dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr);
114 dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr);
115 dev_replace->time_stopped =
116 btrfs_dev_replace_time_stopped(eb, ptr);
117 atomic64_set(&dev_replace->num_write_errors,
118 btrfs_dev_replace_num_write_errors(eb, ptr));
119 atomic64_set(&dev_replace->num_uncorrectable_read_errors,
120 btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr));
121 dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr);
122 dev_replace->committed_cursor_left = dev_replace->cursor_left;
123 dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left;
124 dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr);
125 dev_replace->is_valid = 1;
127 dev_replace->item_needs_writeback = 0;
128 switch (dev_replace->replace_state) {
129 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
130 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
131 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
132 dev_replace->srcdev = NULL;
133 dev_replace->tgtdev = NULL;
135 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
136 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
137 dev_replace->srcdev = btrfs_find_device(fs_info, src_devid,
139 dev_replace->tgtdev = btrfs_find_device(fs_info,
140 BTRFS_DEV_REPLACE_DEVID,
143 * allow 'btrfs dev replace_cancel' if src/tgt device is
146 if (!dev_replace->srcdev &&
147 !btrfs_test_opt(dev_root, DEGRADED)) {
150 "cannot mount because device replace operation is ongoing and");
152 "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?",
155 if (!dev_replace->tgtdev &&
156 !btrfs_test_opt(dev_root, DEGRADED)) {
159 "cannot mount because device replace operation is ongoing and");
161 "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?",
162 BTRFS_DEV_REPLACE_DEVID);
164 if (dev_replace->tgtdev) {
165 if (dev_replace->srcdev) {
166 dev_replace->tgtdev->total_bytes =
167 dev_replace->srcdev->total_bytes;
168 dev_replace->tgtdev->disk_total_bytes =
169 dev_replace->srcdev->disk_total_bytes;
170 dev_replace->tgtdev->bytes_used =
171 dev_replace->srcdev->bytes_used;
173 dev_replace->tgtdev->is_tgtdev_for_dev_replace = 1;
174 btrfs_init_dev_replace_tgtdev_for_resume(fs_info,
175 dev_replace->tgtdev);
182 btrfs_free_path(path);
187 * called from commit_transaction. Writes changed device replace state to
190 int btrfs_run_dev_replace(struct btrfs_trans_handle *trans,
191 struct btrfs_fs_info *fs_info)
194 struct btrfs_root *dev_root = fs_info->dev_root;
195 struct btrfs_path *path;
196 struct btrfs_key key;
197 struct extent_buffer *eb;
198 struct btrfs_dev_replace_item *ptr;
199 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
201 btrfs_dev_replace_lock(dev_replace);
202 if (!dev_replace->is_valid ||
203 !dev_replace->item_needs_writeback) {
204 btrfs_dev_replace_unlock(dev_replace);
207 btrfs_dev_replace_unlock(dev_replace);
210 key.type = BTRFS_DEV_REPLACE_KEY;
213 path = btrfs_alloc_path();
218 ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1);
220 btrfs_warn(fs_info, "error %d while searching for dev_replace item!",
226 btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) {
228 * need to delete old one and insert a new one.
229 * Since no attempt is made to recover any old state, if the
230 * dev_replace state is 'running', the data on the target
232 * It would be possible to recover the state: just make sure
233 * that the beginning of the item is never changed and always
234 * contains all the essential information. Then read this
235 * minimal set of information and use it as a base for the
238 ret = btrfs_del_item(trans, dev_root, path);
240 btrfs_warn(fs_info, "delete too small dev_replace item failed %d!",
248 /* need to insert a new item */
249 btrfs_release_path(path);
250 ret = btrfs_insert_empty_item(trans, dev_root, path,
253 btrfs_warn(fs_info, "insert dev_replace item failed %d!",
260 ptr = btrfs_item_ptr(eb, path->slots[0],
261 struct btrfs_dev_replace_item);
263 btrfs_dev_replace_lock(dev_replace);
264 if (dev_replace->srcdev)
265 btrfs_set_dev_replace_src_devid(eb, ptr,
266 dev_replace->srcdev->devid);
268 btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1);
269 btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr,
270 dev_replace->cont_reading_from_srcdev_mode);
271 btrfs_set_dev_replace_replace_state(eb, ptr,
272 dev_replace->replace_state);
273 btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started);
274 btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped);
275 btrfs_set_dev_replace_num_write_errors(eb, ptr,
276 atomic64_read(&dev_replace->num_write_errors));
277 btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr,
278 atomic64_read(&dev_replace->num_uncorrectable_read_errors));
279 dev_replace->cursor_left_last_write_of_item =
280 dev_replace->cursor_left;
281 btrfs_set_dev_replace_cursor_left(eb, ptr,
282 dev_replace->cursor_left_last_write_of_item);
283 btrfs_set_dev_replace_cursor_right(eb, ptr,
284 dev_replace->cursor_right);
285 dev_replace->item_needs_writeback = 0;
286 btrfs_dev_replace_unlock(dev_replace);
288 btrfs_mark_buffer_dirty(eb);
291 btrfs_free_path(path);
296 void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info)
298 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
300 dev_replace->committed_cursor_left =
301 dev_replace->cursor_left_last_write_of_item;
304 int btrfs_dev_replace_start(struct btrfs_root *root,
305 struct btrfs_ioctl_dev_replace_args *args)
307 struct btrfs_trans_handle *trans;
308 struct btrfs_fs_info *fs_info = root->fs_info;
309 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
311 struct btrfs_device *tgt_device = NULL;
312 struct btrfs_device *src_device = NULL;
314 if (btrfs_fs_incompat(fs_info, RAID56)) {
315 btrfs_warn(fs_info, "dev_replace cannot yet handle RAID5/RAID6");
319 switch (args->start.cont_reading_from_srcdev_mode) {
320 case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS:
321 case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID:
327 if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') ||
328 args->start.tgtdev_name[0] == '\0')
331 mutex_lock(&fs_info->volume_mutex);
332 ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name,
335 btrfs_err(fs_info, "target device %s is invalid!",
336 args->start.tgtdev_name);
337 mutex_unlock(&fs_info->volume_mutex);
341 ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid,
342 args->start.srcdev_name,
344 mutex_unlock(&fs_info->volume_mutex);
350 if (tgt_device->total_bytes < src_device->total_bytes) {
351 btrfs_err(fs_info, "target device is smaller than source device!");
356 btrfs_dev_replace_lock(dev_replace);
357 switch (dev_replace->replace_state) {
358 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
359 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
360 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
362 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
363 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
364 args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED;
368 dev_replace->cont_reading_from_srcdev_mode =
369 args->start.cont_reading_from_srcdev_mode;
370 WARN_ON(!src_device);
371 dev_replace->srcdev = src_device;
372 WARN_ON(!tgt_device);
373 dev_replace->tgtdev = tgt_device;
375 printk_in_rcu(KERN_INFO
376 "BTRFS: dev_replace from %s (devid %llu) to %s started\n",
377 src_device->missing ? "<missing disk>" :
378 rcu_str_deref(src_device->name),
380 rcu_str_deref(tgt_device->name));
382 tgt_device->total_bytes = src_device->total_bytes;
383 tgt_device->disk_total_bytes = src_device->disk_total_bytes;
384 tgt_device->bytes_used = src_device->bytes_used;
387 * from now on, the writes to the srcdev are all duplicated to
388 * go to the tgtdev as well (refer to btrfs_map_block()).
390 dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED;
391 dev_replace->time_started = get_seconds();
392 dev_replace->cursor_left = 0;
393 dev_replace->committed_cursor_left = 0;
394 dev_replace->cursor_left_last_write_of_item = 0;
395 dev_replace->cursor_right = 0;
396 dev_replace->is_valid = 1;
397 dev_replace->item_needs_writeback = 1;
398 args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
399 btrfs_dev_replace_unlock(dev_replace);
401 btrfs_wait_ordered_roots(root->fs_info, -1);
403 /* force writing the updated state information to disk */
404 trans = btrfs_start_transaction(root, 0);
406 ret = PTR_ERR(trans);
407 btrfs_dev_replace_lock(dev_replace);
411 ret = btrfs_commit_transaction(trans, root);
414 /* the disk copy procedure reuses the scrub code */
415 ret = btrfs_scrub_dev(fs_info, src_device->devid, 0,
416 src_device->total_bytes,
417 &dev_replace->scrub_progress, 0, 1);
419 ret = btrfs_dev_replace_finishing(root->fs_info, ret);
425 dev_replace->srcdev = NULL;
426 dev_replace->tgtdev = NULL;
427 btrfs_dev_replace_unlock(dev_replace);
430 btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
434 static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
437 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
438 struct btrfs_device *tgt_device;
439 struct btrfs_device *src_device;
440 struct btrfs_root *root = fs_info->tree_root;
441 u8 uuid_tmp[BTRFS_UUID_SIZE];
442 struct btrfs_trans_handle *trans;
445 /* don't allow cancel or unmount to disturb the finishing procedure */
446 mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
448 btrfs_dev_replace_lock(dev_replace);
449 /* was the operation canceled, or is it finished? */
450 if (dev_replace->replace_state !=
451 BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) {
452 btrfs_dev_replace_unlock(dev_replace);
453 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
457 tgt_device = dev_replace->tgtdev;
458 src_device = dev_replace->srcdev;
459 btrfs_dev_replace_unlock(dev_replace);
461 /* replace old device with new one in mapping tree */
463 btrfs_dev_replace_update_device_in_mapping_tree(fs_info,
468 * flush all outstanding I/O and inode extent mappings before the
469 * copy operation is declared as being finished
471 ret = btrfs_start_delalloc_roots(root->fs_info, 0);
473 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
476 btrfs_wait_ordered_roots(root->fs_info, -1);
478 trans = btrfs_start_transaction(root, 0);
480 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
481 return PTR_ERR(trans);
483 ret = btrfs_commit_transaction(trans, root);
486 /* keep away write_all_supers() during the finishing procedure */
487 mutex_lock(&root->fs_info->chunk_mutex);
488 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
489 btrfs_dev_replace_lock(dev_replace);
490 dev_replace->replace_state =
491 scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
492 : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED;
493 dev_replace->tgtdev = NULL;
494 dev_replace->srcdev = NULL;
495 dev_replace->time_stopped = get_seconds();
496 dev_replace->item_needs_writeback = 1;
499 printk_in_rcu(KERN_ERR
500 "BTRFS: btrfs_scrub_dev(%s, %llu, %s) failed %d\n",
501 src_device->missing ? "<missing disk>" :
502 rcu_str_deref(src_device->name),
504 rcu_str_deref(tgt_device->name), scrub_ret);
505 btrfs_dev_replace_unlock(dev_replace);
506 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
507 mutex_unlock(&root->fs_info->chunk_mutex);
509 btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
510 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
515 printk_in_rcu(KERN_INFO
516 "BTRFS: dev_replace from %s (devid %llu) to %s) finished\n",
517 src_device->missing ? "<missing disk>" :
518 rcu_str_deref(src_device->name),
520 rcu_str_deref(tgt_device->name));
521 tgt_device->is_tgtdev_for_dev_replace = 0;
522 tgt_device->devid = src_device->devid;
523 src_device->devid = BTRFS_DEV_REPLACE_DEVID;
524 tgt_device->bytes_used = src_device->bytes_used;
525 memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp));
526 memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid));
527 memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid));
528 tgt_device->total_bytes = src_device->total_bytes;
529 tgt_device->disk_total_bytes = src_device->disk_total_bytes;
530 tgt_device->bytes_used = src_device->bytes_used;
531 if (fs_info->sb->s_bdev == src_device->bdev)
532 fs_info->sb->s_bdev = tgt_device->bdev;
533 if (fs_info->fs_devices->latest_bdev == src_device->bdev)
534 fs_info->fs_devices->latest_bdev = tgt_device->bdev;
535 list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list);
537 btrfs_rm_dev_replace_srcdev(fs_info, src_device);
540 * this is again a consistent state where no dev_replace procedure
541 * is running, the target device is part of the filesystem, the
542 * source device is not part of the filesystem anymore and its 1st
543 * superblock is scratched out so that it is no longer marked to
544 * belong to this filesystem.
546 btrfs_dev_replace_unlock(dev_replace);
547 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
548 mutex_unlock(&root->fs_info->chunk_mutex);
550 /* write back the superblocks */
551 trans = btrfs_start_transaction(root, 0);
553 btrfs_commit_transaction(trans, root);
555 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
560 static void btrfs_dev_replace_update_device_in_mapping_tree(
561 struct btrfs_fs_info *fs_info,
562 struct btrfs_device *srcdev,
563 struct btrfs_device *tgtdev)
565 struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree;
566 struct extent_map *em;
567 struct map_lookup *map;
571 write_lock(&em_tree->lock);
573 em = lookup_extent_mapping(em_tree, start, (u64)-1);
576 map = (struct map_lookup *)em->bdev;
577 for (i = 0; i < map->num_stripes; i++)
578 if (srcdev == map->stripes[i].dev)
579 map->stripes[i].dev = tgtdev;
580 start = em->start + em->len;
583 write_unlock(&em_tree->lock);
586 static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid,
588 struct btrfs_device **device)
594 *device = btrfs_find_device(root->fs_info, srcdevid, NULL,
599 ret = btrfs_find_device_missing_or_by_path(root, srcdev_name,
605 void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info,
606 struct btrfs_ioctl_dev_replace_args *args)
608 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
610 btrfs_dev_replace_lock(dev_replace);
611 /* even if !dev_replace_is_valid, the values are good enough for
612 * the replace_status ioctl */
613 args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
614 args->status.replace_state = dev_replace->replace_state;
615 args->status.time_started = dev_replace->time_started;
616 args->status.time_stopped = dev_replace->time_stopped;
617 args->status.num_write_errors =
618 atomic64_read(&dev_replace->num_write_errors);
619 args->status.num_uncorrectable_read_errors =
620 atomic64_read(&dev_replace->num_uncorrectable_read_errors);
621 switch (dev_replace->replace_state) {
622 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
623 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
624 args->status.progress_1000 = 0;
626 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
627 args->status.progress_1000 = 1000;
629 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
630 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
631 args->status.progress_1000 = div64_u64(dev_replace->cursor_left,
632 div64_u64(dev_replace->srcdev->total_bytes, 1000));
635 btrfs_dev_replace_unlock(dev_replace);
638 int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info,
639 struct btrfs_ioctl_dev_replace_args *args)
641 args->result = __btrfs_dev_replace_cancel(fs_info);
645 static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info)
647 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
648 struct btrfs_device *tgt_device = NULL;
649 struct btrfs_trans_handle *trans;
650 struct btrfs_root *root = fs_info->tree_root;
654 if (fs_info->sb->s_flags & MS_RDONLY)
657 mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
658 btrfs_dev_replace_lock(dev_replace);
659 switch (dev_replace->replace_state) {
660 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
661 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
662 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
663 result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED;
664 btrfs_dev_replace_unlock(dev_replace);
666 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
667 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
668 result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
669 tgt_device = dev_replace->tgtdev;
670 dev_replace->tgtdev = NULL;
671 dev_replace->srcdev = NULL;
674 dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED;
675 dev_replace->time_stopped = get_seconds();
676 dev_replace->item_needs_writeback = 1;
677 btrfs_dev_replace_unlock(dev_replace);
678 btrfs_scrub_cancel(fs_info);
680 trans = btrfs_start_transaction(root, 0);
682 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
683 return PTR_ERR(trans);
685 ret = btrfs_commit_transaction(trans, root);
688 btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
691 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
695 void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info)
697 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
699 mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
700 btrfs_dev_replace_lock(dev_replace);
701 switch (dev_replace->replace_state) {
702 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
703 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
704 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
705 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
707 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
708 dev_replace->replace_state =
709 BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED;
710 dev_replace->time_stopped = get_seconds();
711 dev_replace->item_needs_writeback = 1;
712 btrfs_info(fs_info, "suspending dev_replace for unmount");
716 btrfs_dev_replace_unlock(dev_replace);
717 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
720 /* resume dev_replace procedure that was interrupted by unmount */
721 int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info)
723 struct task_struct *task;
724 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
726 btrfs_dev_replace_lock(dev_replace);
727 switch (dev_replace->replace_state) {
728 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
729 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
730 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
731 btrfs_dev_replace_unlock(dev_replace);
733 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
735 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
736 dev_replace->replace_state =
737 BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED;
740 if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) {
741 btrfs_info(fs_info, "cannot continue dev_replace, tgtdev is missing");
743 "you may cancel the operation after 'mount -o degraded'");
744 btrfs_dev_replace_unlock(dev_replace);
747 btrfs_dev_replace_unlock(dev_replace);
750 &fs_info->mutually_exclusive_operation_running, 1));
751 task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl");
752 return PTR_ERR_OR_ZERO(task);
755 static int btrfs_dev_replace_kthread(void *data)
757 struct btrfs_fs_info *fs_info = data;
758 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
759 struct btrfs_ioctl_dev_replace_args *status_args;
762 status_args = kzalloc(sizeof(*status_args), GFP_NOFS);
764 btrfs_dev_replace_status(fs_info, status_args);
765 progress = status_args->status.progress_1000;
767 do_div(progress, 10);
768 printk_in_rcu(KERN_INFO
769 "BTRFS: continuing dev_replace from %s (devid %llu) to %s @%u%%\n",
770 dev_replace->srcdev->missing ? "<missing disk>" :
771 rcu_str_deref(dev_replace->srcdev->name),
772 dev_replace->srcdev->devid,
773 dev_replace->tgtdev ?
774 rcu_str_deref(dev_replace->tgtdev->name) :
775 "<missing target disk>",
776 (unsigned int)progress);
778 btrfs_dev_replace_continue_on_mount(fs_info);
779 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
784 static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info)
786 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
789 ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid,
790 dev_replace->committed_cursor_left,
791 dev_replace->srcdev->total_bytes,
792 &dev_replace->scrub_progress, 0, 1);
793 ret = btrfs_dev_replace_finishing(fs_info, ret);
798 int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace)
800 if (!dev_replace->is_valid)
803 switch (dev_replace->replace_state) {
804 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
805 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
806 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
808 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
809 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
811 * return true even if tgtdev is missing (this is
812 * something that can happen if the dev_replace
813 * procedure is suspended by an umount and then
814 * the tgtdev is missing (or "btrfs dev scan") was
815 * not called and the the filesystem is remounted
816 * in degraded state. This does not stop the
817 * dev_replace procedure. It needs to be canceled
818 * manually if the cancelation is wanted.
825 void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace)
827 /* the beginning is just an optimization for the typical case */
828 if (atomic_read(&dev_replace->nesting_level) == 0) {
830 /* this is not a nested case where the same thread
831 * is trying to acqurire the same lock twice */
832 mutex_lock(&dev_replace->lock);
833 mutex_lock(&dev_replace->lock_management_lock);
834 dev_replace->lock_owner = current->pid;
835 atomic_inc(&dev_replace->nesting_level);
836 mutex_unlock(&dev_replace->lock_management_lock);
840 mutex_lock(&dev_replace->lock_management_lock);
841 if (atomic_read(&dev_replace->nesting_level) > 0 &&
842 dev_replace->lock_owner == current->pid) {
843 WARN_ON(!mutex_is_locked(&dev_replace->lock));
844 atomic_inc(&dev_replace->nesting_level);
845 mutex_unlock(&dev_replace->lock_management_lock);
849 mutex_unlock(&dev_replace->lock_management_lock);
853 void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace)
855 WARN_ON(!mutex_is_locked(&dev_replace->lock));
856 mutex_lock(&dev_replace->lock_management_lock);
857 WARN_ON(atomic_read(&dev_replace->nesting_level) < 1);
858 WARN_ON(dev_replace->lock_owner != current->pid);
859 atomic_dec(&dev_replace->nesting_level);
860 if (atomic_read(&dev_replace->nesting_level) == 0) {
861 dev_replace->lock_owner = 0;
862 mutex_unlock(&dev_replace->lock_management_lock);
863 mutex_unlock(&dev_replace->lock);
865 mutex_unlock(&dev_replace->lock_management_lock);