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"
41 static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
43 static void btrfs_dev_replace_update_device_in_mapping_tree(
44 struct btrfs_fs_info *fs_info,
45 struct btrfs_device *srcdev,
46 struct btrfs_device *tgtdev);
47 static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid,
49 struct btrfs_device **device);
50 static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info);
51 static int btrfs_dev_replace_kthread(void *data);
52 static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info);
55 int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info)
58 struct btrfs_root *dev_root = fs_info->dev_root;
59 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
60 struct extent_buffer *eb;
63 struct btrfs_path *path = NULL;
65 struct btrfs_dev_replace_item *ptr;
68 path = btrfs_alloc_path();
75 key.type = BTRFS_DEV_REPLACE_KEY;
77 ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0);
79 no_valid_dev_replace_entry_found:
81 dev_replace->replace_state =
82 BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED;
83 dev_replace->cont_reading_from_srcdev_mode =
84 BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS;
85 dev_replace->replace_state = 0;
86 dev_replace->time_started = 0;
87 dev_replace->time_stopped = 0;
88 atomic64_set(&dev_replace->num_write_errors, 0);
89 atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0);
90 dev_replace->cursor_left = 0;
91 dev_replace->committed_cursor_left = 0;
92 dev_replace->cursor_left_last_write_of_item = 0;
93 dev_replace->cursor_right = 0;
94 dev_replace->srcdev = NULL;
95 dev_replace->tgtdev = NULL;
96 dev_replace->is_valid = 0;
97 dev_replace->item_needs_writeback = 0;
100 slot = path->slots[0];
102 item_size = btrfs_item_size_nr(eb, slot);
103 ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item);
105 if (item_size != sizeof(struct btrfs_dev_replace_item)) {
107 "dev_replace entry found has unexpected size, ignore entry");
108 goto no_valid_dev_replace_entry_found;
111 src_devid = btrfs_dev_replace_src_devid(eb, ptr);
112 dev_replace->cont_reading_from_srcdev_mode =
113 btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr);
114 dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr);
115 dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr);
116 dev_replace->time_stopped =
117 btrfs_dev_replace_time_stopped(eb, ptr);
118 atomic64_set(&dev_replace->num_write_errors,
119 btrfs_dev_replace_num_write_errors(eb, ptr));
120 atomic64_set(&dev_replace->num_uncorrectable_read_errors,
121 btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr));
122 dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr);
123 dev_replace->committed_cursor_left = dev_replace->cursor_left;
124 dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left;
125 dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr);
126 dev_replace->is_valid = 1;
128 dev_replace->item_needs_writeback = 0;
129 switch (dev_replace->replace_state) {
130 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
131 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
132 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
133 dev_replace->srcdev = NULL;
134 dev_replace->tgtdev = NULL;
136 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
137 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
138 dev_replace->srcdev = btrfs_find_device(fs_info, src_devid,
140 dev_replace->tgtdev = btrfs_find_device(fs_info,
141 BTRFS_DEV_REPLACE_DEVID,
144 * allow 'btrfs dev replace_cancel' if src/tgt device is
147 if (!dev_replace->srcdev &&
148 !btrfs_test_opt(dev_root, DEGRADED)) {
151 "cannot mount because device replace operation is ongoing and");
153 "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?",
156 if (!dev_replace->tgtdev &&
157 !btrfs_test_opt(dev_root, DEGRADED)) {
160 "cannot mount because device replace operation is ongoing and");
162 "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?",
163 BTRFS_DEV_REPLACE_DEVID);
165 if (dev_replace->tgtdev) {
166 if (dev_replace->srcdev) {
167 dev_replace->tgtdev->total_bytes =
168 dev_replace->srcdev->total_bytes;
169 dev_replace->tgtdev->disk_total_bytes =
170 dev_replace->srcdev->disk_total_bytes;
171 dev_replace->tgtdev->commit_total_bytes =
172 dev_replace->srcdev->commit_total_bytes;
173 dev_replace->tgtdev->bytes_used =
174 dev_replace->srcdev->bytes_used;
175 dev_replace->tgtdev->commit_bytes_used =
176 dev_replace->srcdev->commit_bytes_used;
178 dev_replace->tgtdev->is_tgtdev_for_dev_replace = 1;
179 btrfs_init_dev_replace_tgtdev_for_resume(fs_info,
180 dev_replace->tgtdev);
187 btrfs_free_path(path);
192 * called from commit_transaction. Writes changed device replace state to
195 int btrfs_run_dev_replace(struct btrfs_trans_handle *trans,
196 struct btrfs_fs_info *fs_info)
199 struct btrfs_root *dev_root = fs_info->dev_root;
200 struct btrfs_path *path;
201 struct btrfs_key key;
202 struct extent_buffer *eb;
203 struct btrfs_dev_replace_item *ptr;
204 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
206 btrfs_dev_replace_lock(dev_replace);
207 if (!dev_replace->is_valid ||
208 !dev_replace->item_needs_writeback) {
209 btrfs_dev_replace_unlock(dev_replace);
212 btrfs_dev_replace_unlock(dev_replace);
215 key.type = BTRFS_DEV_REPLACE_KEY;
218 path = btrfs_alloc_path();
223 ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1);
225 btrfs_warn(fs_info, "error %d while searching for dev_replace item!",
231 btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) {
233 * need to delete old one and insert a new one.
234 * Since no attempt is made to recover any old state, if the
235 * dev_replace state is 'running', the data on the target
237 * It would be possible to recover the state: just make sure
238 * that the beginning of the item is never changed and always
239 * contains all the essential information. Then read this
240 * minimal set of information and use it as a base for the
243 ret = btrfs_del_item(trans, dev_root, path);
245 btrfs_warn(fs_info, "delete too small dev_replace item failed %d!",
253 /* need to insert a new item */
254 btrfs_release_path(path);
255 ret = btrfs_insert_empty_item(trans, dev_root, path,
258 btrfs_warn(fs_info, "insert dev_replace item failed %d!",
265 ptr = btrfs_item_ptr(eb, path->slots[0],
266 struct btrfs_dev_replace_item);
268 btrfs_dev_replace_lock(dev_replace);
269 if (dev_replace->srcdev)
270 btrfs_set_dev_replace_src_devid(eb, ptr,
271 dev_replace->srcdev->devid);
273 btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1);
274 btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr,
275 dev_replace->cont_reading_from_srcdev_mode);
276 btrfs_set_dev_replace_replace_state(eb, ptr,
277 dev_replace->replace_state);
278 btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started);
279 btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped);
280 btrfs_set_dev_replace_num_write_errors(eb, ptr,
281 atomic64_read(&dev_replace->num_write_errors));
282 btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr,
283 atomic64_read(&dev_replace->num_uncorrectable_read_errors));
284 dev_replace->cursor_left_last_write_of_item =
285 dev_replace->cursor_left;
286 btrfs_set_dev_replace_cursor_left(eb, ptr,
287 dev_replace->cursor_left_last_write_of_item);
288 btrfs_set_dev_replace_cursor_right(eb, ptr,
289 dev_replace->cursor_right);
290 dev_replace->item_needs_writeback = 0;
291 btrfs_dev_replace_unlock(dev_replace);
293 btrfs_mark_buffer_dirty(eb);
296 btrfs_free_path(path);
301 void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info)
303 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
305 dev_replace->committed_cursor_left =
306 dev_replace->cursor_left_last_write_of_item;
309 int btrfs_dev_replace_start(struct btrfs_root *root,
310 struct btrfs_ioctl_dev_replace_args *args)
312 struct btrfs_trans_handle *trans;
313 struct btrfs_fs_info *fs_info = root->fs_info;
314 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
316 struct btrfs_device *tgt_device = NULL;
317 struct btrfs_device *src_device = NULL;
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')
332 * Here we commit the transaction to make sure commit_total_bytes
333 * of all the devices are updated.
335 trans = btrfs_attach_transaction(root);
336 if (!IS_ERR(trans)) {
337 ret = btrfs_commit_transaction(trans, root);
340 } else if (PTR_ERR(trans) != -ENOENT) {
341 return PTR_ERR(trans);
344 /* the disk copy procedure reuses the scrub code */
345 mutex_lock(&fs_info->volume_mutex);
346 ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid,
347 args->start.srcdev_name,
350 mutex_unlock(&fs_info->volume_mutex);
354 ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name,
355 src_device, &tgt_device);
356 mutex_unlock(&fs_info->volume_mutex);
360 btrfs_dev_replace_lock(dev_replace);
361 switch (dev_replace->replace_state) {
362 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
363 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
364 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
366 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
367 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
368 args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED;
372 dev_replace->cont_reading_from_srcdev_mode =
373 args->start.cont_reading_from_srcdev_mode;
374 WARN_ON(!src_device);
375 dev_replace->srcdev = src_device;
376 WARN_ON(!tgt_device);
377 dev_replace->tgtdev = tgt_device;
379 printk_in_rcu(KERN_INFO
380 "BTRFS: dev_replace from %s (devid %llu) to %s started\n",
381 src_device->missing ? "<missing disk>" :
382 rcu_str_deref(src_device->name),
384 rcu_str_deref(tgt_device->name));
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 btrfs_device_get_total_bytes(src_device),
417 &dev_replace->scrub_progress, 0, 1);
419 ret = btrfs_dev_replace_finishing(root->fs_info, ret);
420 /* don't warn if EINPROGRESS, someone else might be running scrub */
421 if (ret == -EINPROGRESS) {
422 args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS;
431 dev_replace->srcdev = NULL;
432 dev_replace->tgtdev = NULL;
433 btrfs_dev_replace_unlock(dev_replace);
434 btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
439 * blocked until all flighting bios are finished.
441 static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info)
446 set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state);
448 prepare_to_wait(&fs_info->replace_wait, &wait,
449 TASK_UNINTERRUPTIBLE);
450 writers = percpu_counter_sum(&fs_info->bio_counter);
453 finish_wait(&fs_info->replace_wait, &wait);
458 * we have removed target device, it is safe to allow new bios request.
460 static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info)
462 clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state);
463 if (waitqueue_active(&fs_info->replace_wait))
464 wake_up(&fs_info->replace_wait);
467 static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
470 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
471 struct btrfs_device *tgt_device;
472 struct btrfs_device *src_device;
473 struct btrfs_root *root = fs_info->tree_root;
474 u8 uuid_tmp[BTRFS_UUID_SIZE];
475 struct btrfs_trans_handle *trans;
478 /* don't allow cancel or unmount to disturb the finishing procedure */
479 mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
481 btrfs_dev_replace_lock(dev_replace);
482 /* was the operation canceled, or is it finished? */
483 if (dev_replace->replace_state !=
484 BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) {
485 btrfs_dev_replace_unlock(dev_replace);
486 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
490 tgt_device = dev_replace->tgtdev;
491 src_device = dev_replace->srcdev;
492 btrfs_dev_replace_unlock(dev_replace);
495 * flush all outstanding I/O and inode extent mappings before the
496 * copy operation is declared as being finished
498 ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1);
500 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
503 btrfs_wait_ordered_roots(root->fs_info, -1);
505 trans = btrfs_start_transaction(root, 0);
507 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
508 return PTR_ERR(trans);
510 ret = btrfs_commit_transaction(trans, root);
513 mutex_lock(&uuid_mutex);
514 /* keep away write_all_supers() during the finishing procedure */
515 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
516 mutex_lock(&root->fs_info->chunk_mutex);
517 btrfs_dev_replace_lock(dev_replace);
518 dev_replace->replace_state =
519 scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
520 : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED;
521 dev_replace->tgtdev = NULL;
522 dev_replace->srcdev = NULL;
523 dev_replace->time_stopped = get_seconds();
524 dev_replace->item_needs_writeback = 1;
526 /* replace old device with new one in mapping tree */
528 btrfs_dev_replace_update_device_in_mapping_tree(fs_info,
532 printk_in_rcu(KERN_ERR
533 "BTRFS: btrfs_scrub_dev(%s, %llu, %s) failed %d\n",
534 src_device->missing ? "<missing disk>" :
535 rcu_str_deref(src_device->name),
537 rcu_str_deref(tgt_device->name), scrub_ret);
538 btrfs_dev_replace_unlock(dev_replace);
539 mutex_unlock(&root->fs_info->chunk_mutex);
540 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
541 mutex_unlock(&uuid_mutex);
543 btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
544 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
549 printk_in_rcu(KERN_INFO
550 "BTRFS: dev_replace from %s (devid %llu) to %s finished\n",
551 src_device->missing ? "<missing disk>" :
552 rcu_str_deref(src_device->name),
554 rcu_str_deref(tgt_device->name));
555 tgt_device->is_tgtdev_for_dev_replace = 0;
556 tgt_device->devid = src_device->devid;
557 src_device->devid = BTRFS_DEV_REPLACE_DEVID;
558 memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp));
559 memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid));
560 memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid));
561 btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes);
562 btrfs_device_set_disk_total_bytes(tgt_device,
563 src_device->disk_total_bytes);
564 btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used);
565 ASSERT(list_empty(&src_device->resized_list));
566 tgt_device->commit_total_bytes = src_device->commit_total_bytes;
567 tgt_device->commit_bytes_used = src_device->bytes_used;
568 if (fs_info->sb->s_bdev == src_device->bdev)
569 fs_info->sb->s_bdev = tgt_device->bdev;
570 if (fs_info->fs_devices->latest_bdev == src_device->bdev)
571 fs_info->fs_devices->latest_bdev = tgt_device->bdev;
572 list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list);
573 fs_info->fs_devices->rw_devices++;
575 btrfs_dev_replace_unlock(dev_replace);
577 btrfs_rm_dev_replace_blocked(fs_info);
579 btrfs_rm_dev_replace_remove_srcdev(fs_info, src_device);
581 btrfs_rm_dev_replace_unblocked(fs_info);
584 * this is again a consistent state where no dev_replace procedure
585 * is running, the target device is part of the filesystem, the
586 * source device is not part of the filesystem anymore and its 1st
587 * superblock is scratched out so that it is no longer marked to
588 * belong to this filesystem.
590 mutex_unlock(&root->fs_info->chunk_mutex);
591 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
592 mutex_unlock(&uuid_mutex);
594 /* replace the sysfs entry */
595 btrfs_kobj_rm_device(fs_info, src_device);
596 btrfs_kobj_add_device(fs_info, tgt_device);
597 btrfs_rm_dev_replace_free_srcdev(fs_info, src_device);
599 /* write back the superblocks */
600 trans = btrfs_start_transaction(root, 0);
602 btrfs_commit_transaction(trans, root);
604 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
609 static void btrfs_dev_replace_update_device_in_mapping_tree(
610 struct btrfs_fs_info *fs_info,
611 struct btrfs_device *srcdev,
612 struct btrfs_device *tgtdev)
614 struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree;
615 struct extent_map *em;
616 struct map_lookup *map;
620 write_lock(&em_tree->lock);
622 em = lookup_extent_mapping(em_tree, start, (u64)-1);
625 map = (struct map_lookup *)em->bdev;
626 for (i = 0; i < map->num_stripes; i++)
627 if (srcdev == map->stripes[i].dev)
628 map->stripes[i].dev = tgtdev;
629 start = em->start + em->len;
632 write_unlock(&em_tree->lock);
635 static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid,
637 struct btrfs_device **device)
643 *device = btrfs_find_device(root->fs_info, srcdevid, NULL,
648 ret = btrfs_find_device_missing_or_by_path(root, srcdev_name,
654 void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info,
655 struct btrfs_ioctl_dev_replace_args *args)
657 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
658 struct btrfs_device *srcdev;
660 btrfs_dev_replace_lock(dev_replace);
661 /* even if !dev_replace_is_valid, the values are good enough for
662 * the replace_status ioctl */
663 args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
664 args->status.replace_state = dev_replace->replace_state;
665 args->status.time_started = dev_replace->time_started;
666 args->status.time_stopped = dev_replace->time_stopped;
667 args->status.num_write_errors =
668 atomic64_read(&dev_replace->num_write_errors);
669 args->status.num_uncorrectable_read_errors =
670 atomic64_read(&dev_replace->num_uncorrectable_read_errors);
671 switch (dev_replace->replace_state) {
672 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
673 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
674 args->status.progress_1000 = 0;
676 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
677 args->status.progress_1000 = 1000;
679 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
680 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
681 srcdev = dev_replace->srcdev;
682 args->status.progress_1000 = div64_u64(dev_replace->cursor_left,
683 div64_u64(btrfs_device_get_total_bytes(srcdev), 1000));
686 btrfs_dev_replace_unlock(dev_replace);
689 int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info,
690 struct btrfs_ioctl_dev_replace_args *args)
692 args->result = __btrfs_dev_replace_cancel(fs_info);
696 static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info)
698 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
699 struct btrfs_device *tgt_device = NULL;
700 struct btrfs_trans_handle *trans;
701 struct btrfs_root *root = fs_info->tree_root;
705 if (fs_info->sb->s_flags & MS_RDONLY)
708 mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
709 btrfs_dev_replace_lock(dev_replace);
710 switch (dev_replace->replace_state) {
711 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
712 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
713 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
714 result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED;
715 btrfs_dev_replace_unlock(dev_replace);
717 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
718 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
719 result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
720 tgt_device = dev_replace->tgtdev;
721 dev_replace->tgtdev = NULL;
722 dev_replace->srcdev = NULL;
725 dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED;
726 dev_replace->time_stopped = get_seconds();
727 dev_replace->item_needs_writeback = 1;
728 btrfs_dev_replace_unlock(dev_replace);
729 btrfs_scrub_cancel(fs_info);
731 trans = btrfs_start_transaction(root, 0);
733 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
734 return PTR_ERR(trans);
736 ret = btrfs_commit_transaction(trans, root);
739 btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
742 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
746 void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info)
748 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
750 mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
751 btrfs_dev_replace_lock(dev_replace);
752 switch (dev_replace->replace_state) {
753 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
754 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
755 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
756 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
758 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
759 dev_replace->replace_state =
760 BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED;
761 dev_replace->time_stopped = get_seconds();
762 dev_replace->item_needs_writeback = 1;
763 btrfs_info(fs_info, "suspending dev_replace for unmount");
767 btrfs_dev_replace_unlock(dev_replace);
768 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
771 /* resume dev_replace procedure that was interrupted by unmount */
772 int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info)
774 struct task_struct *task;
775 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
777 btrfs_dev_replace_lock(dev_replace);
778 switch (dev_replace->replace_state) {
779 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
780 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
781 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
782 btrfs_dev_replace_unlock(dev_replace);
784 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
786 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
787 dev_replace->replace_state =
788 BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED;
791 if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) {
792 btrfs_info(fs_info, "cannot continue dev_replace, tgtdev is missing");
794 "you may cancel the operation after 'mount -o degraded'");
795 btrfs_dev_replace_unlock(dev_replace);
798 btrfs_dev_replace_unlock(dev_replace);
801 &fs_info->mutually_exclusive_operation_running, 1));
802 task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl");
803 return PTR_ERR_OR_ZERO(task);
806 static int btrfs_dev_replace_kthread(void *data)
808 struct btrfs_fs_info *fs_info = data;
809 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
810 struct btrfs_ioctl_dev_replace_args *status_args;
813 status_args = kzalloc(sizeof(*status_args), GFP_NOFS);
815 btrfs_dev_replace_status(fs_info, status_args);
816 progress = status_args->status.progress_1000;
818 do_div(progress, 10);
819 printk_in_rcu(KERN_INFO
820 "BTRFS: continuing dev_replace from %s (devid %llu) to %s @%u%%\n",
821 dev_replace->srcdev->missing ? "<missing disk>" :
822 rcu_str_deref(dev_replace->srcdev->name),
823 dev_replace->srcdev->devid,
824 dev_replace->tgtdev ?
825 rcu_str_deref(dev_replace->tgtdev->name) :
826 "<missing target disk>",
827 (unsigned int)progress);
829 btrfs_dev_replace_continue_on_mount(fs_info);
830 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
835 static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info)
837 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
840 ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid,
841 dev_replace->committed_cursor_left,
842 btrfs_device_get_total_bytes(dev_replace->srcdev),
843 &dev_replace->scrub_progress, 0, 1);
844 ret = btrfs_dev_replace_finishing(fs_info, ret);
849 int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace)
851 if (!dev_replace->is_valid)
854 switch (dev_replace->replace_state) {
855 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
856 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
857 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
859 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
860 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
862 * return true even if tgtdev is missing (this is
863 * something that can happen if the dev_replace
864 * procedure is suspended by an umount and then
865 * the tgtdev is missing (or "btrfs dev scan") was
866 * not called and the the filesystem is remounted
867 * in degraded state. This does not stop the
868 * dev_replace procedure. It needs to be canceled
869 * manually if the cancelation is wanted.
876 void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace)
878 /* the beginning is just an optimization for the typical case */
879 if (atomic_read(&dev_replace->nesting_level) == 0) {
881 /* this is not a nested case where the same thread
882 * is trying to acqurire the same lock twice */
883 mutex_lock(&dev_replace->lock);
884 mutex_lock(&dev_replace->lock_management_lock);
885 dev_replace->lock_owner = current->pid;
886 atomic_inc(&dev_replace->nesting_level);
887 mutex_unlock(&dev_replace->lock_management_lock);
891 mutex_lock(&dev_replace->lock_management_lock);
892 if (atomic_read(&dev_replace->nesting_level) > 0 &&
893 dev_replace->lock_owner == current->pid) {
894 WARN_ON(!mutex_is_locked(&dev_replace->lock));
895 atomic_inc(&dev_replace->nesting_level);
896 mutex_unlock(&dev_replace->lock_management_lock);
900 mutex_unlock(&dev_replace->lock_management_lock);
904 void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace)
906 WARN_ON(!mutex_is_locked(&dev_replace->lock));
907 mutex_lock(&dev_replace->lock_management_lock);
908 WARN_ON(atomic_read(&dev_replace->nesting_level) < 1);
909 WARN_ON(dev_replace->lock_owner != current->pid);
910 atomic_dec(&dev_replace->nesting_level);
911 if (atomic_read(&dev_replace->nesting_level) == 0) {
912 dev_replace->lock_owner = 0;
913 mutex_unlock(&dev_replace->lock_management_lock);
914 mutex_unlock(&dev_replace->lock);
916 mutex_unlock(&dev_replace->lock_management_lock);
920 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info)
922 percpu_counter_inc(&fs_info->bio_counter);
925 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount)
927 percpu_counter_sub(&fs_info->bio_counter, amount);
929 if (waitqueue_active(&fs_info->replace_wait))
930 wake_up(&fs_info->replace_wait);
933 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info)
937 percpu_counter_inc(&fs_info->bio_counter);
938 if (test_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state)) {
939 btrfs_bio_counter_dec(fs_info);
940 wait_event(fs_info->replace_wait,
941 !test_bit(BTRFS_FS_STATE_DEV_REPLACING,
942 &fs_info->fs_state));