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
->bytes_used
=
172 dev_replace
->srcdev
->bytes_used
;
174 dev_replace
->tgtdev
->is_tgtdev_for_dev_replace
= 1;
175 btrfs_init_dev_replace_tgtdev_for_resume(fs_info
,
176 dev_replace
->tgtdev
);
183 btrfs_free_path(path
);
188 * called from commit_transaction. Writes changed device replace state to
191 int btrfs_run_dev_replace(struct btrfs_trans_handle
*trans
,
192 struct btrfs_fs_info
*fs_info
)
195 struct btrfs_root
*dev_root
= fs_info
->dev_root
;
196 struct btrfs_path
*path
;
197 struct btrfs_key key
;
198 struct extent_buffer
*eb
;
199 struct btrfs_dev_replace_item
*ptr
;
200 struct btrfs_dev_replace
*dev_replace
= &fs_info
->dev_replace
;
202 btrfs_dev_replace_lock(dev_replace
);
203 if (!dev_replace
->is_valid
||
204 !dev_replace
->item_needs_writeback
) {
205 btrfs_dev_replace_unlock(dev_replace
);
208 btrfs_dev_replace_unlock(dev_replace
);
211 key
.type
= BTRFS_DEV_REPLACE_KEY
;
214 path
= btrfs_alloc_path();
219 ret
= btrfs_search_slot(trans
, dev_root
, &key
, path
, -1, 1);
221 btrfs_warn(fs_info
, "error %d while searching for dev_replace item!",
227 btrfs_item_size_nr(path
->nodes
[0], path
->slots
[0]) < sizeof(*ptr
)) {
229 * need to delete old one and insert a new one.
230 * Since no attempt is made to recover any old state, if the
231 * dev_replace state is 'running', the data on the target
233 * It would be possible to recover the state: just make sure
234 * that the beginning of the item is never changed and always
235 * contains all the essential information. Then read this
236 * minimal set of information and use it as a base for the
239 ret
= btrfs_del_item(trans
, dev_root
, path
);
241 btrfs_warn(fs_info
, "delete too small dev_replace item failed %d!",
249 /* need to insert a new item */
250 btrfs_release_path(path
);
251 ret
= btrfs_insert_empty_item(trans
, dev_root
, path
,
254 btrfs_warn(fs_info
, "insert dev_replace item failed %d!",
261 ptr
= btrfs_item_ptr(eb
, path
->slots
[0],
262 struct btrfs_dev_replace_item
);
264 btrfs_dev_replace_lock(dev_replace
);
265 if (dev_replace
->srcdev
)
266 btrfs_set_dev_replace_src_devid(eb
, ptr
,
267 dev_replace
->srcdev
->devid
);
269 btrfs_set_dev_replace_src_devid(eb
, ptr
, (u64
)-1);
270 btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb
, ptr
,
271 dev_replace
->cont_reading_from_srcdev_mode
);
272 btrfs_set_dev_replace_replace_state(eb
, ptr
,
273 dev_replace
->replace_state
);
274 btrfs_set_dev_replace_time_started(eb
, ptr
, dev_replace
->time_started
);
275 btrfs_set_dev_replace_time_stopped(eb
, ptr
, dev_replace
->time_stopped
);
276 btrfs_set_dev_replace_num_write_errors(eb
, ptr
,
277 atomic64_read(&dev_replace
->num_write_errors
));
278 btrfs_set_dev_replace_num_uncorrectable_read_errors(eb
, ptr
,
279 atomic64_read(&dev_replace
->num_uncorrectable_read_errors
));
280 dev_replace
->cursor_left_last_write_of_item
=
281 dev_replace
->cursor_left
;
282 btrfs_set_dev_replace_cursor_left(eb
, ptr
,
283 dev_replace
->cursor_left_last_write_of_item
);
284 btrfs_set_dev_replace_cursor_right(eb
, ptr
,
285 dev_replace
->cursor_right
);
286 dev_replace
->item_needs_writeback
= 0;
287 btrfs_dev_replace_unlock(dev_replace
);
289 btrfs_mark_buffer_dirty(eb
);
292 btrfs_free_path(path
);
297 void btrfs_after_dev_replace_commit(struct btrfs_fs_info
*fs_info
)
299 struct btrfs_dev_replace
*dev_replace
= &fs_info
->dev_replace
;
301 dev_replace
->committed_cursor_left
=
302 dev_replace
->cursor_left_last_write_of_item
;
305 int btrfs_dev_replace_start(struct btrfs_root
*root
,
306 struct btrfs_ioctl_dev_replace_args
*args
)
308 struct btrfs_trans_handle
*trans
;
309 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
310 struct btrfs_dev_replace
*dev_replace
= &fs_info
->dev_replace
;
312 struct btrfs_device
*tgt_device
= NULL
;
313 struct btrfs_device
*src_device
= NULL
;
315 if (btrfs_fs_incompat(fs_info
, RAID56
)) {
316 btrfs_warn(fs_info
, "dev_replace cannot yet handle RAID5/RAID6");
320 switch (args
->start
.cont_reading_from_srcdev_mode
) {
321 case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS
:
322 case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID
:
328 if ((args
->start
.srcdevid
== 0 && args
->start
.srcdev_name
[0] == '\0') ||
329 args
->start
.tgtdev_name
[0] == '\0')
332 mutex_lock(&fs_info
->volume_mutex
);
333 ret
= btrfs_init_dev_replace_tgtdev(root
, args
->start
.tgtdev_name
,
336 btrfs_err(fs_info
, "target device %s is invalid!",
337 args
->start
.tgtdev_name
);
338 mutex_unlock(&fs_info
->volume_mutex
);
342 ret
= btrfs_dev_replace_find_srcdev(root
, args
->start
.srcdevid
,
343 args
->start
.srcdev_name
,
345 mutex_unlock(&fs_info
->volume_mutex
);
351 if (tgt_device
->total_bytes
< src_device
->total_bytes
) {
352 btrfs_err(fs_info
, "target device is smaller than source device!");
357 btrfs_dev_replace_lock(dev_replace
);
358 switch (dev_replace
->replace_state
) {
359 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED
:
360 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED
:
361 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
:
363 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED
:
364 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED
:
365 args
->result
= BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED
;
369 dev_replace
->cont_reading_from_srcdev_mode
=
370 args
->start
.cont_reading_from_srcdev_mode
;
371 WARN_ON(!src_device
);
372 dev_replace
->srcdev
= src_device
;
373 WARN_ON(!tgt_device
);
374 dev_replace
->tgtdev
= tgt_device
;
376 printk_in_rcu(KERN_INFO
377 "BTRFS: dev_replace from %s (devid %llu) to %s started\n",
378 src_device
->missing
? "<missing disk>" :
379 rcu_str_deref(src_device
->name
),
381 rcu_str_deref(tgt_device
->name
));
383 tgt_device
->total_bytes
= src_device
->total_bytes
;
384 tgt_device
->disk_total_bytes
= src_device
->disk_total_bytes
;
385 tgt_device
->bytes_used
= src_device
->bytes_used
;
388 * from now on, the writes to the srcdev are all duplicated to
389 * go to the tgtdev as well (refer to btrfs_map_block()).
391 dev_replace
->replace_state
= BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED
;
392 dev_replace
->time_started
= get_seconds();
393 dev_replace
->cursor_left
= 0;
394 dev_replace
->committed_cursor_left
= 0;
395 dev_replace
->cursor_left_last_write_of_item
= 0;
396 dev_replace
->cursor_right
= 0;
397 dev_replace
->is_valid
= 1;
398 dev_replace
->item_needs_writeback
= 1;
399 args
->result
= BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR
;
400 btrfs_dev_replace_unlock(dev_replace
);
402 btrfs_wait_ordered_roots(root
->fs_info
, -1);
404 /* force writing the updated state information to disk */
405 trans
= btrfs_start_transaction(root
, 0);
407 ret
= PTR_ERR(trans
);
408 btrfs_dev_replace_lock(dev_replace
);
412 ret
= btrfs_commit_transaction(trans
, root
);
415 /* the disk copy procedure reuses the scrub code */
416 ret
= btrfs_scrub_dev(fs_info
, src_device
->devid
, 0,
417 src_device
->total_bytes
,
418 &dev_replace
->scrub_progress
, 0, 1);
420 ret
= btrfs_dev_replace_finishing(root
->fs_info
, ret
);
426 dev_replace
->srcdev
= NULL
;
427 dev_replace
->tgtdev
= NULL
;
428 btrfs_dev_replace_unlock(dev_replace
);
431 btrfs_destroy_dev_replace_tgtdev(fs_info
, tgt_device
);
436 * blocked until all flighting bios are finished.
438 static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info
*fs_info
)
443 set_bit(BTRFS_FS_STATE_DEV_REPLACING
, &fs_info
->fs_state
);
445 prepare_to_wait(&fs_info
->replace_wait
, &wait
,
446 TASK_UNINTERRUPTIBLE
);
447 writers
= percpu_counter_sum(&fs_info
->bio_counter
);
450 finish_wait(&fs_info
->replace_wait
, &wait
);
455 * we have removed target device, it is safe to allow new bios request.
457 static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info
*fs_info
)
459 clear_bit(BTRFS_FS_STATE_DEV_REPLACING
, &fs_info
->fs_state
);
460 if (waitqueue_active(&fs_info
->replace_wait
))
461 wake_up(&fs_info
->replace_wait
);
464 static int btrfs_dev_replace_finishing(struct btrfs_fs_info
*fs_info
,
467 struct btrfs_dev_replace
*dev_replace
= &fs_info
->dev_replace
;
468 struct btrfs_device
*tgt_device
;
469 struct btrfs_device
*src_device
;
470 struct btrfs_root
*root
= fs_info
->tree_root
;
471 u8 uuid_tmp
[BTRFS_UUID_SIZE
];
472 struct btrfs_trans_handle
*trans
;
475 /* don't allow cancel or unmount to disturb the finishing procedure */
476 mutex_lock(&dev_replace
->lock_finishing_cancel_unmount
);
478 btrfs_dev_replace_lock(dev_replace
);
479 /* was the operation canceled, or is it finished? */
480 if (dev_replace
->replace_state
!=
481 BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED
) {
482 btrfs_dev_replace_unlock(dev_replace
);
483 mutex_unlock(&dev_replace
->lock_finishing_cancel_unmount
);
487 tgt_device
= dev_replace
->tgtdev
;
488 src_device
= dev_replace
->srcdev
;
489 btrfs_dev_replace_unlock(dev_replace
);
492 * flush all outstanding I/O and inode extent mappings before the
493 * copy operation is declared as being finished
495 ret
= btrfs_start_delalloc_roots(root
->fs_info
, 0, -1);
497 mutex_unlock(&dev_replace
->lock_finishing_cancel_unmount
);
500 btrfs_wait_ordered_roots(root
->fs_info
, -1);
502 trans
= btrfs_start_transaction(root
, 0);
504 mutex_unlock(&dev_replace
->lock_finishing_cancel_unmount
);
505 return PTR_ERR(trans
);
507 ret
= btrfs_commit_transaction(trans
, root
);
510 /* keep away write_all_supers() during the finishing procedure */
511 mutex_lock(&root
->fs_info
->chunk_mutex
);
512 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
513 btrfs_dev_replace_lock(dev_replace
);
514 dev_replace
->replace_state
=
515 scrub_ret
? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
516 : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED
;
517 dev_replace
->tgtdev
= NULL
;
518 dev_replace
->srcdev
= NULL
;
519 dev_replace
->time_stopped
= get_seconds();
520 dev_replace
->item_needs_writeback
= 1;
522 /* replace old device with new one in mapping tree */
524 btrfs_dev_replace_update_device_in_mapping_tree(fs_info
,
528 printk_in_rcu(KERN_ERR
529 "BTRFS: btrfs_scrub_dev(%s, %llu, %s) failed %d\n",
530 src_device
->missing
? "<missing disk>" :
531 rcu_str_deref(src_device
->name
),
533 rcu_str_deref(tgt_device
->name
), scrub_ret
);
534 btrfs_dev_replace_unlock(dev_replace
);
535 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
536 mutex_unlock(&root
->fs_info
->chunk_mutex
);
538 btrfs_destroy_dev_replace_tgtdev(fs_info
, tgt_device
);
539 mutex_unlock(&dev_replace
->lock_finishing_cancel_unmount
);
544 printk_in_rcu(KERN_INFO
545 "BTRFS: dev_replace from %s (devid %llu) to %s) finished\n",
546 src_device
->missing
? "<missing disk>" :
547 rcu_str_deref(src_device
->name
),
549 rcu_str_deref(tgt_device
->name
));
550 tgt_device
->is_tgtdev_for_dev_replace
= 0;
551 tgt_device
->devid
= src_device
->devid
;
552 src_device
->devid
= BTRFS_DEV_REPLACE_DEVID
;
553 tgt_device
->bytes_used
= src_device
->bytes_used
;
554 memcpy(uuid_tmp
, tgt_device
->uuid
, sizeof(uuid_tmp
));
555 memcpy(tgt_device
->uuid
, src_device
->uuid
, sizeof(tgt_device
->uuid
));
556 memcpy(src_device
->uuid
, uuid_tmp
, sizeof(src_device
->uuid
));
557 tgt_device
->total_bytes
= src_device
->total_bytes
;
558 tgt_device
->disk_total_bytes
= src_device
->disk_total_bytes
;
559 tgt_device
->bytes_used
= src_device
->bytes_used
;
560 if (fs_info
->sb
->s_bdev
== src_device
->bdev
)
561 fs_info
->sb
->s_bdev
= tgt_device
->bdev
;
562 if (fs_info
->fs_devices
->latest_bdev
== src_device
->bdev
)
563 fs_info
->fs_devices
->latest_bdev
= tgt_device
->bdev
;
564 list_add(&tgt_device
->dev_alloc_list
, &fs_info
->fs_devices
->alloc_list
);
566 /* replace the sysfs entry */
567 btrfs_kobj_rm_device(fs_info
, src_device
);
568 btrfs_kobj_add_device(fs_info
, tgt_device
);
570 btrfs_rm_dev_replace_blocked(fs_info
);
572 btrfs_rm_dev_replace_srcdev(fs_info
, src_device
);
574 btrfs_rm_dev_replace_unblocked(fs_info
);
577 * this is again a consistent state where no dev_replace procedure
578 * is running, the target device is part of the filesystem, the
579 * source device is not part of the filesystem anymore and its 1st
580 * superblock is scratched out so that it is no longer marked to
581 * belong to this filesystem.
583 btrfs_dev_replace_unlock(dev_replace
);
584 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
585 mutex_unlock(&root
->fs_info
->chunk_mutex
);
587 /* write back the superblocks */
588 trans
= btrfs_start_transaction(root
, 0);
590 btrfs_commit_transaction(trans
, root
);
592 mutex_unlock(&dev_replace
->lock_finishing_cancel_unmount
);
597 static void btrfs_dev_replace_update_device_in_mapping_tree(
598 struct btrfs_fs_info
*fs_info
,
599 struct btrfs_device
*srcdev
,
600 struct btrfs_device
*tgtdev
)
602 struct extent_map_tree
*em_tree
= &fs_info
->mapping_tree
.map_tree
;
603 struct extent_map
*em
;
604 struct map_lookup
*map
;
608 write_lock(&em_tree
->lock
);
610 em
= lookup_extent_mapping(em_tree
, start
, (u64
)-1);
613 map
= (struct map_lookup
*)em
->bdev
;
614 for (i
= 0; i
< map
->num_stripes
; i
++)
615 if (srcdev
== map
->stripes
[i
].dev
)
616 map
->stripes
[i
].dev
= tgtdev
;
617 start
= em
->start
+ em
->len
;
620 write_unlock(&em_tree
->lock
);
623 static int btrfs_dev_replace_find_srcdev(struct btrfs_root
*root
, u64 srcdevid
,
625 struct btrfs_device
**device
)
631 *device
= btrfs_find_device(root
->fs_info
, srcdevid
, NULL
,
636 ret
= btrfs_find_device_missing_or_by_path(root
, srcdev_name
,
642 void btrfs_dev_replace_status(struct btrfs_fs_info
*fs_info
,
643 struct btrfs_ioctl_dev_replace_args
*args
)
645 struct btrfs_dev_replace
*dev_replace
= &fs_info
->dev_replace
;
647 btrfs_dev_replace_lock(dev_replace
);
648 /* even if !dev_replace_is_valid, the values are good enough for
649 * the replace_status ioctl */
650 args
->result
= BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR
;
651 args
->status
.replace_state
= dev_replace
->replace_state
;
652 args
->status
.time_started
= dev_replace
->time_started
;
653 args
->status
.time_stopped
= dev_replace
->time_stopped
;
654 args
->status
.num_write_errors
=
655 atomic64_read(&dev_replace
->num_write_errors
);
656 args
->status
.num_uncorrectable_read_errors
=
657 atomic64_read(&dev_replace
->num_uncorrectable_read_errors
);
658 switch (dev_replace
->replace_state
) {
659 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED
:
660 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
:
661 args
->status
.progress_1000
= 0;
663 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED
:
664 args
->status
.progress_1000
= 1000;
666 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED
:
667 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED
:
668 args
->status
.progress_1000
= div64_u64(dev_replace
->cursor_left
,
669 div64_u64(dev_replace
->srcdev
->total_bytes
, 1000));
672 btrfs_dev_replace_unlock(dev_replace
);
675 int btrfs_dev_replace_cancel(struct btrfs_fs_info
*fs_info
,
676 struct btrfs_ioctl_dev_replace_args
*args
)
678 args
->result
= __btrfs_dev_replace_cancel(fs_info
);
682 static u64
__btrfs_dev_replace_cancel(struct btrfs_fs_info
*fs_info
)
684 struct btrfs_dev_replace
*dev_replace
= &fs_info
->dev_replace
;
685 struct btrfs_device
*tgt_device
= NULL
;
686 struct btrfs_trans_handle
*trans
;
687 struct btrfs_root
*root
= fs_info
->tree_root
;
691 if (fs_info
->sb
->s_flags
& MS_RDONLY
)
694 mutex_lock(&dev_replace
->lock_finishing_cancel_unmount
);
695 btrfs_dev_replace_lock(dev_replace
);
696 switch (dev_replace
->replace_state
) {
697 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED
:
698 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED
:
699 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
:
700 result
= BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED
;
701 btrfs_dev_replace_unlock(dev_replace
);
703 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED
:
704 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED
:
705 result
= BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR
;
706 tgt_device
= dev_replace
->tgtdev
;
707 dev_replace
->tgtdev
= NULL
;
708 dev_replace
->srcdev
= NULL
;
711 dev_replace
->replace_state
= BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
;
712 dev_replace
->time_stopped
= get_seconds();
713 dev_replace
->item_needs_writeback
= 1;
714 btrfs_dev_replace_unlock(dev_replace
);
715 btrfs_scrub_cancel(fs_info
);
717 trans
= btrfs_start_transaction(root
, 0);
719 mutex_unlock(&dev_replace
->lock_finishing_cancel_unmount
);
720 return PTR_ERR(trans
);
722 ret
= btrfs_commit_transaction(trans
, root
);
725 btrfs_destroy_dev_replace_tgtdev(fs_info
, tgt_device
);
728 mutex_unlock(&dev_replace
->lock_finishing_cancel_unmount
);
732 void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info
*fs_info
)
734 struct btrfs_dev_replace
*dev_replace
= &fs_info
->dev_replace
;
736 mutex_lock(&dev_replace
->lock_finishing_cancel_unmount
);
737 btrfs_dev_replace_lock(dev_replace
);
738 switch (dev_replace
->replace_state
) {
739 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED
:
740 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED
:
741 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
:
742 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED
:
744 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED
:
745 dev_replace
->replace_state
=
746 BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED
;
747 dev_replace
->time_stopped
= get_seconds();
748 dev_replace
->item_needs_writeback
= 1;
749 btrfs_info(fs_info
, "suspending dev_replace for unmount");
753 btrfs_dev_replace_unlock(dev_replace
);
754 mutex_unlock(&dev_replace
->lock_finishing_cancel_unmount
);
757 /* resume dev_replace procedure that was interrupted by unmount */
758 int btrfs_resume_dev_replace_async(struct btrfs_fs_info
*fs_info
)
760 struct task_struct
*task
;
761 struct btrfs_dev_replace
*dev_replace
= &fs_info
->dev_replace
;
763 btrfs_dev_replace_lock(dev_replace
);
764 switch (dev_replace
->replace_state
) {
765 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED
:
766 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED
:
767 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
:
768 btrfs_dev_replace_unlock(dev_replace
);
770 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED
:
772 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED
:
773 dev_replace
->replace_state
=
774 BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED
;
777 if (!dev_replace
->tgtdev
|| !dev_replace
->tgtdev
->bdev
) {
778 btrfs_info(fs_info
, "cannot continue dev_replace, tgtdev is missing");
780 "you may cancel the operation after 'mount -o degraded'");
781 btrfs_dev_replace_unlock(dev_replace
);
784 btrfs_dev_replace_unlock(dev_replace
);
787 &fs_info
->mutually_exclusive_operation_running
, 1));
788 task
= kthread_run(btrfs_dev_replace_kthread
, fs_info
, "btrfs-devrepl");
789 return PTR_ERR_OR_ZERO(task
);
792 static int btrfs_dev_replace_kthread(void *data
)
794 struct btrfs_fs_info
*fs_info
= data
;
795 struct btrfs_dev_replace
*dev_replace
= &fs_info
->dev_replace
;
796 struct btrfs_ioctl_dev_replace_args
*status_args
;
799 status_args
= kzalloc(sizeof(*status_args
), GFP_NOFS
);
801 btrfs_dev_replace_status(fs_info
, status_args
);
802 progress
= status_args
->status
.progress_1000
;
804 do_div(progress
, 10);
805 printk_in_rcu(KERN_INFO
806 "BTRFS: continuing dev_replace from %s (devid %llu) to %s @%u%%\n",
807 dev_replace
->srcdev
->missing
? "<missing disk>" :
808 rcu_str_deref(dev_replace
->srcdev
->name
),
809 dev_replace
->srcdev
->devid
,
810 dev_replace
->tgtdev
?
811 rcu_str_deref(dev_replace
->tgtdev
->name
) :
812 "<missing target disk>",
813 (unsigned int)progress
);
815 btrfs_dev_replace_continue_on_mount(fs_info
);
816 atomic_set(&fs_info
->mutually_exclusive_operation_running
, 0);
821 static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info
*fs_info
)
823 struct btrfs_dev_replace
*dev_replace
= &fs_info
->dev_replace
;
826 ret
= btrfs_scrub_dev(fs_info
, dev_replace
->srcdev
->devid
,
827 dev_replace
->committed_cursor_left
,
828 dev_replace
->srcdev
->total_bytes
,
829 &dev_replace
->scrub_progress
, 0, 1);
830 ret
= btrfs_dev_replace_finishing(fs_info
, ret
);
835 int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace
*dev_replace
)
837 if (!dev_replace
->is_valid
)
840 switch (dev_replace
->replace_state
) {
841 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED
:
842 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED
:
843 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
:
845 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED
:
846 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED
:
848 * return true even if tgtdev is missing (this is
849 * something that can happen if the dev_replace
850 * procedure is suspended by an umount and then
851 * the tgtdev is missing (or "btrfs dev scan") was
852 * not called and the the filesystem is remounted
853 * in degraded state. This does not stop the
854 * dev_replace procedure. It needs to be canceled
855 * manually if the cancelation is wanted.
862 void btrfs_dev_replace_lock(struct btrfs_dev_replace
*dev_replace
)
864 /* the beginning is just an optimization for the typical case */
865 if (atomic_read(&dev_replace
->nesting_level
) == 0) {
867 /* this is not a nested case where the same thread
868 * is trying to acqurire the same lock twice */
869 mutex_lock(&dev_replace
->lock
);
870 mutex_lock(&dev_replace
->lock_management_lock
);
871 dev_replace
->lock_owner
= current
->pid
;
872 atomic_inc(&dev_replace
->nesting_level
);
873 mutex_unlock(&dev_replace
->lock_management_lock
);
877 mutex_lock(&dev_replace
->lock_management_lock
);
878 if (atomic_read(&dev_replace
->nesting_level
) > 0 &&
879 dev_replace
->lock_owner
== current
->pid
) {
880 WARN_ON(!mutex_is_locked(&dev_replace
->lock
));
881 atomic_inc(&dev_replace
->nesting_level
);
882 mutex_unlock(&dev_replace
->lock_management_lock
);
886 mutex_unlock(&dev_replace
->lock_management_lock
);
890 void btrfs_dev_replace_unlock(struct btrfs_dev_replace
*dev_replace
)
892 WARN_ON(!mutex_is_locked(&dev_replace
->lock
));
893 mutex_lock(&dev_replace
->lock_management_lock
);
894 WARN_ON(atomic_read(&dev_replace
->nesting_level
) < 1);
895 WARN_ON(dev_replace
->lock_owner
!= current
->pid
);
896 atomic_dec(&dev_replace
->nesting_level
);
897 if (atomic_read(&dev_replace
->nesting_level
) == 0) {
898 dev_replace
->lock_owner
= 0;
899 mutex_unlock(&dev_replace
->lock_management_lock
);
900 mutex_unlock(&dev_replace
->lock
);
902 mutex_unlock(&dev_replace
->lock_management_lock
);
906 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info
*fs_info
)
908 percpu_counter_inc(&fs_info
->bio_counter
);
911 void btrfs_bio_counter_dec(struct btrfs_fs_info
*fs_info
)
913 percpu_counter_dec(&fs_info
->bio_counter
);
915 if (waitqueue_active(&fs_info
->replace_wait
))
916 wake_up(&fs_info
->replace_wait
);
919 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info
*fs_info
)
923 percpu_counter_inc(&fs_info
->bio_counter
);
924 if (test_bit(BTRFS_FS_STATE_DEV_REPLACING
, &fs_info
->fs_state
)) {
925 btrfs_bio_counter_dec(fs_info
);
926 wait_event(fs_info
->replace_wait
,
927 !test_bit(BTRFS_FS_STATE_DEV_REPLACING
,
928 &fs_info
->fs_state
));