2 * Copyright (C) 2007 Oracle. 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/ratelimit.h>
27 #include <linux/kthread.h>
28 #include <linux/raid/pq.h>
29 #include <linux/semaphore.h>
30 #include <asm/div64.h>
32 #include "extent_map.h"
34 #include "transaction.h"
35 #include "print-tree.h"
38 #include "async-thread.h"
39 #include "check-integrity.h"
40 #include "rcu-string.h"
42 #include "dev-replace.h"
45 static int init_first_rw_device(struct btrfs_trans_handle
*trans
,
46 struct btrfs_root
*root
,
47 struct btrfs_device
*device
);
48 static int btrfs_relocate_sys_chunks(struct btrfs_root
*root
);
49 static void __btrfs_reset_dev_stats(struct btrfs_device
*dev
);
50 static void btrfs_dev_stat_print_on_error(struct btrfs_device
*dev
);
51 static void btrfs_dev_stat_print_on_load(struct btrfs_device
*device
);
53 DEFINE_MUTEX(uuid_mutex
);
54 static LIST_HEAD(fs_uuids
);
55 struct list_head
*btrfs_get_fs_uuids(void)
60 static struct btrfs_fs_devices
*__alloc_fs_devices(void)
62 struct btrfs_fs_devices
*fs_devs
;
64 fs_devs
= kzalloc(sizeof(*fs_devs
), GFP_NOFS
);
66 return ERR_PTR(-ENOMEM
);
68 mutex_init(&fs_devs
->device_list_mutex
);
70 INIT_LIST_HEAD(&fs_devs
->devices
);
71 INIT_LIST_HEAD(&fs_devs
->resized_devices
);
72 INIT_LIST_HEAD(&fs_devs
->alloc_list
);
73 INIT_LIST_HEAD(&fs_devs
->list
);
79 * alloc_fs_devices - allocate struct btrfs_fs_devices
80 * @fsid: a pointer to UUID for this FS. If NULL a new UUID is
83 * Return: a pointer to a new &struct btrfs_fs_devices on success;
84 * ERR_PTR() on error. Returned struct is not linked onto any lists and
85 * can be destroyed with kfree() right away.
87 static struct btrfs_fs_devices
*alloc_fs_devices(const u8
*fsid
)
89 struct btrfs_fs_devices
*fs_devs
;
91 fs_devs
= __alloc_fs_devices();
96 memcpy(fs_devs
->fsid
, fsid
, BTRFS_FSID_SIZE
);
98 generate_random_uuid(fs_devs
->fsid
);
103 static void free_fs_devices(struct btrfs_fs_devices
*fs_devices
)
105 struct btrfs_device
*device
;
106 WARN_ON(fs_devices
->opened
);
107 while (!list_empty(&fs_devices
->devices
)) {
108 device
= list_entry(fs_devices
->devices
.next
,
109 struct btrfs_device
, dev_list
);
110 list_del(&device
->dev_list
);
111 rcu_string_free(device
->name
);
117 static void btrfs_kobject_uevent(struct block_device
*bdev
,
118 enum kobject_action action
)
122 ret
= kobject_uevent(&disk_to_dev(bdev
->bd_disk
)->kobj
, action
);
124 pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n",
126 kobject_name(&disk_to_dev(bdev
->bd_disk
)->kobj
),
127 &disk_to_dev(bdev
->bd_disk
)->kobj
);
130 void btrfs_cleanup_fs_uuids(void)
132 struct btrfs_fs_devices
*fs_devices
;
134 while (!list_empty(&fs_uuids
)) {
135 fs_devices
= list_entry(fs_uuids
.next
,
136 struct btrfs_fs_devices
, list
);
137 list_del(&fs_devices
->list
);
138 free_fs_devices(fs_devices
);
142 static struct btrfs_device
*__alloc_device(void)
144 struct btrfs_device
*dev
;
146 dev
= kzalloc(sizeof(*dev
), GFP_NOFS
);
148 return ERR_PTR(-ENOMEM
);
150 INIT_LIST_HEAD(&dev
->dev_list
);
151 INIT_LIST_HEAD(&dev
->dev_alloc_list
);
152 INIT_LIST_HEAD(&dev
->resized_list
);
154 spin_lock_init(&dev
->io_lock
);
156 spin_lock_init(&dev
->reada_lock
);
157 atomic_set(&dev
->reada_in_flight
, 0);
158 atomic_set(&dev
->dev_stats_ccnt
, 0);
159 INIT_RADIX_TREE(&dev
->reada_zones
, GFP_NOFS
& ~__GFP_WAIT
);
160 INIT_RADIX_TREE(&dev
->reada_extents
, GFP_NOFS
& ~__GFP_WAIT
);
165 static noinline
struct btrfs_device
*__find_device(struct list_head
*head
,
168 struct btrfs_device
*dev
;
170 list_for_each_entry(dev
, head
, dev_list
) {
171 if (dev
->devid
== devid
&&
172 (!uuid
|| !memcmp(dev
->uuid
, uuid
, BTRFS_UUID_SIZE
))) {
179 static noinline
struct btrfs_fs_devices
*find_fsid(u8
*fsid
)
181 struct btrfs_fs_devices
*fs_devices
;
183 list_for_each_entry(fs_devices
, &fs_uuids
, list
) {
184 if (memcmp(fsid
, fs_devices
->fsid
, BTRFS_FSID_SIZE
) == 0)
191 btrfs_get_bdev_and_sb(const char *device_path
, fmode_t flags
, void *holder
,
192 int flush
, struct block_device
**bdev
,
193 struct buffer_head
**bh
)
197 *bdev
= blkdev_get_by_path(device_path
, flags
, holder
);
200 ret
= PTR_ERR(*bdev
);
201 printk(KERN_INFO
"BTRFS: open %s failed\n", device_path
);
206 filemap_write_and_wait((*bdev
)->bd_inode
->i_mapping
);
207 ret
= set_blocksize(*bdev
, 4096);
209 blkdev_put(*bdev
, flags
);
212 invalidate_bdev(*bdev
);
213 *bh
= btrfs_read_dev_super(*bdev
);
216 blkdev_put(*bdev
, flags
);
228 static void requeue_list(struct btrfs_pending_bios
*pending_bios
,
229 struct bio
*head
, struct bio
*tail
)
232 struct bio
*old_head
;
234 old_head
= pending_bios
->head
;
235 pending_bios
->head
= head
;
236 if (pending_bios
->tail
)
237 tail
->bi_next
= old_head
;
239 pending_bios
->tail
= tail
;
243 * we try to collect pending bios for a device so we don't get a large
244 * number of procs sending bios down to the same device. This greatly
245 * improves the schedulers ability to collect and merge the bios.
247 * But, it also turns into a long list of bios to process and that is sure
248 * to eventually make the worker thread block. The solution here is to
249 * make some progress and then put this work struct back at the end of
250 * the list if the block device is congested. This way, multiple devices
251 * can make progress from a single worker thread.
253 static noinline
void run_scheduled_bios(struct btrfs_device
*device
)
256 struct backing_dev_info
*bdi
;
257 struct btrfs_fs_info
*fs_info
;
258 struct btrfs_pending_bios
*pending_bios
;
262 unsigned long num_run
;
263 unsigned long batch_run
= 0;
265 unsigned long last_waited
= 0;
267 int sync_pending
= 0;
268 struct blk_plug plug
;
271 * this function runs all the bios we've collected for
272 * a particular device. We don't want to wander off to
273 * another device without first sending all of these down.
274 * So, setup a plug here and finish it off before we return
276 blk_start_plug(&plug
);
278 bdi
= blk_get_backing_dev_info(device
->bdev
);
279 fs_info
= device
->dev_root
->fs_info
;
280 limit
= btrfs_async_submit_limit(fs_info
);
281 limit
= limit
* 2 / 3;
284 spin_lock(&device
->io_lock
);
289 /* take all the bios off the list at once and process them
290 * later on (without the lock held). But, remember the
291 * tail and other pointers so the bios can be properly reinserted
292 * into the list if we hit congestion
294 if (!force_reg
&& device
->pending_sync_bios
.head
) {
295 pending_bios
= &device
->pending_sync_bios
;
298 pending_bios
= &device
->pending_bios
;
302 pending
= pending_bios
->head
;
303 tail
= pending_bios
->tail
;
304 WARN_ON(pending
&& !tail
);
307 * if pending was null this time around, no bios need processing
308 * at all and we can stop. Otherwise it'll loop back up again
309 * and do an additional check so no bios are missed.
311 * device->running_pending is used to synchronize with the
314 if (device
->pending_sync_bios
.head
== NULL
&&
315 device
->pending_bios
.head
== NULL
) {
317 device
->running_pending
= 0;
320 device
->running_pending
= 1;
323 pending_bios
->head
= NULL
;
324 pending_bios
->tail
= NULL
;
326 spin_unlock(&device
->io_lock
);
331 /* we want to work on both lists, but do more bios on the
332 * sync list than the regular list
335 pending_bios
!= &device
->pending_sync_bios
&&
336 device
->pending_sync_bios
.head
) ||
337 (num_run
> 64 && pending_bios
== &device
->pending_sync_bios
&&
338 device
->pending_bios
.head
)) {
339 spin_lock(&device
->io_lock
);
340 requeue_list(pending_bios
, pending
, tail
);
345 pending
= pending
->bi_next
;
348 if (atomic_dec_return(&fs_info
->nr_async_bios
) < limit
&&
349 waitqueue_active(&fs_info
->async_submit_wait
))
350 wake_up(&fs_info
->async_submit_wait
);
352 BUG_ON(atomic_read(&cur
->__bi_cnt
) == 0);
355 * if we're doing the sync list, record that our
356 * plug has some sync requests on it
358 * If we're doing the regular list and there are
359 * sync requests sitting around, unplug before
362 if (pending_bios
== &device
->pending_sync_bios
) {
364 } else if (sync_pending
) {
365 blk_finish_plug(&plug
);
366 blk_start_plug(&plug
);
370 btrfsic_submit_bio(cur
->bi_rw
, cur
);
377 * we made progress, there is more work to do and the bdi
378 * is now congested. Back off and let other work structs
381 if (pending
&& bdi_write_congested(bdi
) && batch_run
> 8 &&
382 fs_info
->fs_devices
->open_devices
> 1) {
383 struct io_context
*ioc
;
385 ioc
= current
->io_context
;
388 * the main goal here is that we don't want to
389 * block if we're going to be able to submit
390 * more requests without blocking.
392 * This code does two great things, it pokes into
393 * the elevator code from a filesystem _and_
394 * it makes assumptions about how batching works.
396 if (ioc
&& ioc
->nr_batch_requests
> 0 &&
397 time_before(jiffies
, ioc
->last_waited
+ HZ
/50UL) &&
399 ioc
->last_waited
== last_waited
)) {
401 * we want to go through our batch of
402 * requests and stop. So, we copy out
403 * the ioc->last_waited time and test
404 * against it before looping
406 last_waited
= ioc
->last_waited
;
410 spin_lock(&device
->io_lock
);
411 requeue_list(pending_bios
, pending
, tail
);
412 device
->running_pending
= 1;
414 spin_unlock(&device
->io_lock
);
415 btrfs_queue_work(fs_info
->submit_workers
,
419 /* unplug every 64 requests just for good measure */
420 if (batch_run
% 64 == 0) {
421 blk_finish_plug(&plug
);
422 blk_start_plug(&plug
);
431 spin_lock(&device
->io_lock
);
432 if (device
->pending_bios
.head
|| device
->pending_sync_bios
.head
)
434 spin_unlock(&device
->io_lock
);
437 blk_finish_plug(&plug
);
440 static void pending_bios_fn(struct btrfs_work
*work
)
442 struct btrfs_device
*device
;
444 device
= container_of(work
, struct btrfs_device
, work
);
445 run_scheduled_bios(device
);
449 void btrfs_free_stale_device(struct btrfs_device
*cur_dev
)
451 struct btrfs_fs_devices
*fs_devs
;
452 struct btrfs_device
*dev
;
457 list_for_each_entry(fs_devs
, &fs_uuids
, list
) {
462 if (fs_devs
->seeding
)
465 list_for_each_entry(dev
, &fs_devs
->devices
, dev_list
) {
473 * Todo: This won't be enough. What if the same device
474 * comes back (with new uuid and) with its mapper path?
475 * But for now, this does help as mostly an admin will
476 * either use mapper or non mapper path throughout.
479 del
= strcmp(rcu_str_deref(dev
->name
),
480 rcu_str_deref(cur_dev
->name
));
487 /* delete the stale device */
488 if (fs_devs
->num_devices
== 1) {
489 btrfs_sysfs_remove_fsid(fs_devs
);
490 list_del(&fs_devs
->list
);
491 free_fs_devices(fs_devs
);
493 fs_devs
->num_devices
--;
494 list_del(&dev
->dev_list
);
495 rcu_string_free(dev
->name
);
504 * Add new device to list of registered devices
507 * 1 - first time device is seen
508 * 0 - device already known
511 static noinline
int device_list_add(const char *path
,
512 struct btrfs_super_block
*disk_super
,
513 u64 devid
, struct btrfs_fs_devices
**fs_devices_ret
)
515 struct btrfs_device
*device
;
516 struct btrfs_fs_devices
*fs_devices
;
517 struct rcu_string
*name
;
519 u64 found_transid
= btrfs_super_generation(disk_super
);
521 fs_devices
= find_fsid(disk_super
->fsid
);
523 fs_devices
= alloc_fs_devices(disk_super
->fsid
);
524 if (IS_ERR(fs_devices
))
525 return PTR_ERR(fs_devices
);
527 list_add(&fs_devices
->list
, &fs_uuids
);
531 device
= __find_device(&fs_devices
->devices
, devid
,
532 disk_super
->dev_item
.uuid
);
536 if (fs_devices
->opened
)
539 device
= btrfs_alloc_device(NULL
, &devid
,
540 disk_super
->dev_item
.uuid
);
541 if (IS_ERR(device
)) {
542 /* we can safely leave the fs_devices entry around */
543 return PTR_ERR(device
);
546 name
= rcu_string_strdup(path
, GFP_NOFS
);
551 rcu_assign_pointer(device
->name
, name
);
553 mutex_lock(&fs_devices
->device_list_mutex
);
554 list_add_rcu(&device
->dev_list
, &fs_devices
->devices
);
555 fs_devices
->num_devices
++;
556 mutex_unlock(&fs_devices
->device_list_mutex
);
559 device
->fs_devices
= fs_devices
;
560 } else if (!device
->name
|| strcmp(device
->name
->str
, path
)) {
562 * When FS is already mounted.
563 * 1. If you are here and if the device->name is NULL that
564 * means this device was missing at time of FS mount.
565 * 2. If you are here and if the device->name is different
566 * from 'path' that means either
567 * a. The same device disappeared and reappeared with
569 * b. The missing-disk-which-was-replaced, has
572 * We must allow 1 and 2a above. But 2b would be a spurious
575 * Further in case of 1 and 2a above, the disk at 'path'
576 * would have missed some transaction when it was away and
577 * in case of 2a the stale bdev has to be updated as well.
578 * 2b must not be allowed at all time.
582 * For now, we do allow update to btrfs_fs_device through the
583 * btrfs dev scan cli after FS has been mounted. We're still
584 * tracking a problem where systems fail mount by subvolume id
585 * when we reject replacement on a mounted FS.
587 if (!fs_devices
->opened
&& found_transid
< device
->generation
) {
589 * That is if the FS is _not_ mounted and if you
590 * are here, that means there is more than one
591 * disk with same uuid and devid.We keep the one
592 * with larger generation number or the last-in if
593 * generation are equal.
598 name
= rcu_string_strdup(path
, GFP_NOFS
);
601 rcu_string_free(device
->name
);
602 rcu_assign_pointer(device
->name
, name
);
603 if (device
->missing
) {
604 fs_devices
->missing_devices
--;
610 * Unmount does not free the btrfs_device struct but would zero
611 * generation along with most of the other members. So just update
612 * it back. We need it to pick the disk with largest generation
615 if (!fs_devices
->opened
)
616 device
->generation
= found_transid
;
619 * if there is new btrfs on an already registered device,
620 * then remove the stale device entry.
622 btrfs_free_stale_device(device
);
624 *fs_devices_ret
= fs_devices
;
629 static struct btrfs_fs_devices
*clone_fs_devices(struct btrfs_fs_devices
*orig
)
631 struct btrfs_fs_devices
*fs_devices
;
632 struct btrfs_device
*device
;
633 struct btrfs_device
*orig_dev
;
635 fs_devices
= alloc_fs_devices(orig
->fsid
);
636 if (IS_ERR(fs_devices
))
639 mutex_lock(&orig
->device_list_mutex
);
640 fs_devices
->total_devices
= orig
->total_devices
;
642 /* We have held the volume lock, it is safe to get the devices. */
643 list_for_each_entry(orig_dev
, &orig
->devices
, dev_list
) {
644 struct rcu_string
*name
;
646 device
= btrfs_alloc_device(NULL
, &orig_dev
->devid
,
652 * This is ok to do without rcu read locked because we hold the
653 * uuid mutex so nothing we touch in here is going to disappear.
655 if (orig_dev
->name
) {
656 name
= rcu_string_strdup(orig_dev
->name
->str
, GFP_NOFS
);
661 rcu_assign_pointer(device
->name
, name
);
664 list_add(&device
->dev_list
, &fs_devices
->devices
);
665 device
->fs_devices
= fs_devices
;
666 fs_devices
->num_devices
++;
668 mutex_unlock(&orig
->device_list_mutex
);
671 mutex_unlock(&orig
->device_list_mutex
);
672 free_fs_devices(fs_devices
);
673 return ERR_PTR(-ENOMEM
);
676 void btrfs_close_extra_devices(struct btrfs_fs_devices
*fs_devices
, int step
)
678 struct btrfs_device
*device
, *next
;
679 struct btrfs_device
*latest_dev
= NULL
;
681 mutex_lock(&uuid_mutex
);
683 /* This is the initialized path, it is safe to release the devices. */
684 list_for_each_entry_safe(device
, next
, &fs_devices
->devices
, dev_list
) {
685 if (device
->in_fs_metadata
) {
686 if (!device
->is_tgtdev_for_dev_replace
&&
688 device
->generation
> latest_dev
->generation
)) {
694 if (device
->devid
== BTRFS_DEV_REPLACE_DEVID
) {
696 * In the first step, keep the device which has
697 * the correct fsid and the devid that is used
698 * for the dev_replace procedure.
699 * In the second step, the dev_replace state is
700 * read from the device tree and it is known
701 * whether the procedure is really active or
702 * not, which means whether this device is
703 * used or whether it should be removed.
705 if (step
== 0 || device
->is_tgtdev_for_dev_replace
) {
710 blkdev_put(device
->bdev
, device
->mode
);
712 fs_devices
->open_devices
--;
714 if (device
->writeable
) {
715 list_del_init(&device
->dev_alloc_list
);
716 device
->writeable
= 0;
717 if (!device
->is_tgtdev_for_dev_replace
)
718 fs_devices
->rw_devices
--;
720 list_del_init(&device
->dev_list
);
721 fs_devices
->num_devices
--;
722 rcu_string_free(device
->name
);
726 if (fs_devices
->seed
) {
727 fs_devices
= fs_devices
->seed
;
731 fs_devices
->latest_bdev
= latest_dev
->bdev
;
733 mutex_unlock(&uuid_mutex
);
736 static void __free_device(struct work_struct
*work
)
738 struct btrfs_device
*device
;
740 device
= container_of(work
, struct btrfs_device
, rcu_work
);
743 blkdev_put(device
->bdev
, device
->mode
);
745 rcu_string_free(device
->name
);
749 static void free_device(struct rcu_head
*head
)
751 struct btrfs_device
*device
;
753 device
= container_of(head
, struct btrfs_device
, rcu
);
755 INIT_WORK(&device
->rcu_work
, __free_device
);
756 schedule_work(&device
->rcu_work
);
759 static int __btrfs_close_devices(struct btrfs_fs_devices
*fs_devices
)
761 struct btrfs_device
*device
, *tmp
;
763 if (--fs_devices
->opened
> 0)
766 mutex_lock(&fs_devices
->device_list_mutex
);
767 list_for_each_entry_safe(device
, tmp
, &fs_devices
->devices
, dev_list
) {
768 struct btrfs_device
*new_device
;
769 struct rcu_string
*name
;
772 fs_devices
->open_devices
--;
774 if (device
->writeable
&&
775 device
->devid
!= BTRFS_DEV_REPLACE_DEVID
) {
776 list_del_init(&device
->dev_alloc_list
);
777 fs_devices
->rw_devices
--;
781 fs_devices
->missing_devices
--;
783 new_device
= btrfs_alloc_device(NULL
, &device
->devid
,
785 BUG_ON(IS_ERR(new_device
)); /* -ENOMEM */
787 /* Safe because we are under uuid_mutex */
789 name
= rcu_string_strdup(device
->name
->str
, GFP_NOFS
);
790 BUG_ON(!name
); /* -ENOMEM */
791 rcu_assign_pointer(new_device
->name
, name
);
794 list_replace_rcu(&device
->dev_list
, &new_device
->dev_list
);
795 new_device
->fs_devices
= device
->fs_devices
;
797 call_rcu(&device
->rcu
, free_device
);
799 mutex_unlock(&fs_devices
->device_list_mutex
);
801 WARN_ON(fs_devices
->open_devices
);
802 WARN_ON(fs_devices
->rw_devices
);
803 fs_devices
->opened
= 0;
804 fs_devices
->seeding
= 0;
809 int btrfs_close_devices(struct btrfs_fs_devices
*fs_devices
)
811 struct btrfs_fs_devices
*seed_devices
= NULL
;
814 mutex_lock(&uuid_mutex
);
815 ret
= __btrfs_close_devices(fs_devices
);
816 if (!fs_devices
->opened
) {
817 seed_devices
= fs_devices
->seed
;
818 fs_devices
->seed
= NULL
;
820 mutex_unlock(&uuid_mutex
);
822 while (seed_devices
) {
823 fs_devices
= seed_devices
;
824 seed_devices
= fs_devices
->seed
;
825 __btrfs_close_devices(fs_devices
);
826 free_fs_devices(fs_devices
);
829 * Wait for rcu kworkers under __btrfs_close_devices
830 * to finish all blkdev_puts so device is really
831 * free when umount is done.
837 static int __btrfs_open_devices(struct btrfs_fs_devices
*fs_devices
,
838 fmode_t flags
, void *holder
)
840 struct request_queue
*q
;
841 struct block_device
*bdev
;
842 struct list_head
*head
= &fs_devices
->devices
;
843 struct btrfs_device
*device
;
844 struct btrfs_device
*latest_dev
= NULL
;
845 struct buffer_head
*bh
;
846 struct btrfs_super_block
*disk_super
;
853 list_for_each_entry(device
, head
, dev_list
) {
859 /* Just open everything we can; ignore failures here */
860 if (btrfs_get_bdev_and_sb(device
->name
->str
, flags
, holder
, 1,
864 disk_super
= (struct btrfs_super_block
*)bh
->b_data
;
865 devid
= btrfs_stack_device_id(&disk_super
->dev_item
);
866 if (devid
!= device
->devid
)
869 if (memcmp(device
->uuid
, disk_super
->dev_item
.uuid
,
873 device
->generation
= btrfs_super_generation(disk_super
);
875 device
->generation
> latest_dev
->generation
)
878 if (btrfs_super_flags(disk_super
) & BTRFS_SUPER_FLAG_SEEDING
) {
879 device
->writeable
= 0;
881 device
->writeable
= !bdev_read_only(bdev
);
885 q
= bdev_get_queue(bdev
);
886 if (blk_queue_discard(q
))
887 device
->can_discard
= 1;
890 device
->in_fs_metadata
= 0;
891 device
->mode
= flags
;
893 if (!blk_queue_nonrot(bdev_get_queue(bdev
)))
894 fs_devices
->rotating
= 1;
896 fs_devices
->open_devices
++;
897 if (device
->writeable
&&
898 device
->devid
!= BTRFS_DEV_REPLACE_DEVID
) {
899 fs_devices
->rw_devices
++;
900 list_add(&device
->dev_alloc_list
,
901 &fs_devices
->alloc_list
);
908 blkdev_put(bdev
, flags
);
911 if (fs_devices
->open_devices
== 0) {
915 fs_devices
->seeding
= seeding
;
916 fs_devices
->opened
= 1;
917 fs_devices
->latest_bdev
= latest_dev
->bdev
;
918 fs_devices
->total_rw_bytes
= 0;
923 int btrfs_open_devices(struct btrfs_fs_devices
*fs_devices
,
924 fmode_t flags
, void *holder
)
928 mutex_lock(&uuid_mutex
);
929 if (fs_devices
->opened
) {
930 fs_devices
->opened
++;
933 ret
= __btrfs_open_devices(fs_devices
, flags
, holder
);
935 mutex_unlock(&uuid_mutex
);
940 * Look for a btrfs signature on a device. This may be called out of the mount path
941 * and we are not allowed to call set_blocksize during the scan. The superblock
942 * is read via pagecache
944 int btrfs_scan_one_device(const char *path
, fmode_t flags
, void *holder
,
945 struct btrfs_fs_devices
**fs_devices_ret
)
947 struct btrfs_super_block
*disk_super
;
948 struct block_device
*bdev
;
959 * we would like to check all the supers, but that would make
960 * a btrfs mount succeed after a mkfs from a different FS.
961 * So, we need to add a special mount option to scan for
962 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
964 bytenr
= btrfs_sb_offset(0);
966 mutex_lock(&uuid_mutex
);
968 bdev
= blkdev_get_by_path(path
, flags
, holder
);
975 /* make sure our super fits in the device */
976 if (bytenr
+ PAGE_CACHE_SIZE
>= i_size_read(bdev
->bd_inode
))
979 /* make sure our super fits in the page */
980 if (sizeof(*disk_super
) > PAGE_CACHE_SIZE
)
983 /* make sure our super doesn't straddle pages on disk */
984 index
= bytenr
>> PAGE_CACHE_SHIFT
;
985 if ((bytenr
+ sizeof(*disk_super
) - 1) >> PAGE_CACHE_SHIFT
!= index
)
988 /* pull in the page with our super */
989 page
= read_cache_page_gfp(bdev
->bd_inode
->i_mapping
,
992 if (IS_ERR_OR_NULL(page
))
997 /* align our pointer to the offset of the super block */
998 disk_super
= p
+ (bytenr
& ~PAGE_CACHE_MASK
);
1000 if (btrfs_super_bytenr(disk_super
) != bytenr
||
1001 btrfs_super_magic(disk_super
) != BTRFS_MAGIC
)
1004 devid
= btrfs_stack_device_id(&disk_super
->dev_item
);
1005 transid
= btrfs_super_generation(disk_super
);
1006 total_devices
= btrfs_super_num_devices(disk_super
);
1008 ret
= device_list_add(path
, disk_super
, devid
, fs_devices_ret
);
1010 if (disk_super
->label
[0]) {
1011 if (disk_super
->label
[BTRFS_LABEL_SIZE
- 1])
1012 disk_super
->label
[BTRFS_LABEL_SIZE
- 1] = '\0';
1013 printk(KERN_INFO
"BTRFS: device label %s ", disk_super
->label
);
1015 printk(KERN_INFO
"BTRFS: device fsid %pU ", disk_super
->fsid
);
1018 printk(KERN_CONT
"devid %llu transid %llu %s\n", devid
, transid
, path
);
1021 if (!ret
&& fs_devices_ret
)
1022 (*fs_devices_ret
)->total_devices
= total_devices
;
1026 page_cache_release(page
);
1029 blkdev_put(bdev
, flags
);
1031 mutex_unlock(&uuid_mutex
);
1035 /* helper to account the used device space in the range */
1036 int btrfs_account_dev_extents_size(struct btrfs_device
*device
, u64 start
,
1037 u64 end
, u64
*length
)
1039 struct btrfs_key key
;
1040 struct btrfs_root
*root
= device
->dev_root
;
1041 struct btrfs_dev_extent
*dev_extent
;
1042 struct btrfs_path
*path
;
1046 struct extent_buffer
*l
;
1050 if (start
>= device
->total_bytes
|| device
->is_tgtdev_for_dev_replace
)
1053 path
= btrfs_alloc_path();
1058 key
.objectid
= device
->devid
;
1060 key
.type
= BTRFS_DEV_EXTENT_KEY
;
1062 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1066 ret
= btrfs_previous_item(root
, path
, key
.objectid
, key
.type
);
1073 slot
= path
->slots
[0];
1074 if (slot
>= btrfs_header_nritems(l
)) {
1075 ret
= btrfs_next_leaf(root
, path
);
1083 btrfs_item_key_to_cpu(l
, &key
, slot
);
1085 if (key
.objectid
< device
->devid
)
1088 if (key
.objectid
> device
->devid
)
1091 if (key
.type
!= BTRFS_DEV_EXTENT_KEY
)
1094 dev_extent
= btrfs_item_ptr(l
, slot
, struct btrfs_dev_extent
);
1095 extent_end
= key
.offset
+ btrfs_dev_extent_length(l
,
1097 if (key
.offset
<= start
&& extent_end
> end
) {
1098 *length
= end
- start
+ 1;
1100 } else if (key
.offset
<= start
&& extent_end
> start
)
1101 *length
+= extent_end
- start
;
1102 else if (key
.offset
> start
&& extent_end
<= end
)
1103 *length
+= extent_end
- key
.offset
;
1104 else if (key
.offset
> start
&& key
.offset
<= end
) {
1105 *length
+= end
- key
.offset
+ 1;
1107 } else if (key
.offset
> end
)
1115 btrfs_free_path(path
);
1119 static int contains_pending_extent(struct btrfs_transaction
*transaction
,
1120 struct btrfs_device
*device
,
1121 u64
*start
, u64 len
)
1123 struct btrfs_fs_info
*fs_info
= device
->dev_root
->fs_info
;
1124 struct extent_map
*em
;
1125 struct list_head
*search_list
= &fs_info
->pinned_chunks
;
1127 u64 physical_start
= *start
;
1130 search_list
= &transaction
->pending_chunks
;
1132 list_for_each_entry(em
, search_list
, list
) {
1133 struct map_lookup
*map
;
1136 map
= (struct map_lookup
*)em
->bdev
;
1137 for (i
= 0; i
< map
->num_stripes
; i
++) {
1140 if (map
->stripes
[i
].dev
!= device
)
1142 if (map
->stripes
[i
].physical
>= physical_start
+ len
||
1143 map
->stripes
[i
].physical
+ em
->orig_block_len
<=
1147 * Make sure that while processing the pinned list we do
1148 * not override our *start with a lower value, because
1149 * we can have pinned chunks that fall within this
1150 * device hole and that have lower physical addresses
1151 * than the pending chunks we processed before. If we
1152 * do not take this special care we can end up getting
1153 * 2 pending chunks that start at the same physical
1154 * device offsets because the end offset of a pinned
1155 * chunk can be equal to the start offset of some
1158 end
= map
->stripes
[i
].physical
+ em
->orig_block_len
;
1165 if (search_list
!= &fs_info
->pinned_chunks
) {
1166 search_list
= &fs_info
->pinned_chunks
;
1175 * find_free_dev_extent_start - find free space in the specified device
1176 * @device: the device which we search the free space in
1177 * @num_bytes: the size of the free space that we need
1178 * @search_start: the position from which to begin the search
1179 * @start: store the start of the free space.
1180 * @len: the size of the free space. that we find, or the size
1181 * of the max free space if we don't find suitable free space
1183 * this uses a pretty simple search, the expectation is that it is
1184 * called very infrequently and that a given device has a small number
1187 * @start is used to store the start of the free space if we find. But if we
1188 * don't find suitable free space, it will be used to store the start position
1189 * of the max free space.
1191 * @len is used to store the size of the free space that we find.
1192 * But if we don't find suitable free space, it is used to store the size of
1193 * the max free space.
1195 int find_free_dev_extent_start(struct btrfs_transaction
*transaction
,
1196 struct btrfs_device
*device
, u64 num_bytes
,
1197 u64 search_start
, u64
*start
, u64
*len
)
1199 struct btrfs_key key
;
1200 struct btrfs_root
*root
= device
->dev_root
;
1201 struct btrfs_dev_extent
*dev_extent
;
1202 struct btrfs_path
*path
;
1207 u64 search_end
= device
->total_bytes
;
1210 struct extent_buffer
*l
;
1212 path
= btrfs_alloc_path();
1216 max_hole_start
= search_start
;
1220 if (search_start
>= search_end
|| device
->is_tgtdev_for_dev_replace
) {
1226 path
->search_commit_root
= 1;
1227 path
->skip_locking
= 1;
1229 key
.objectid
= device
->devid
;
1230 key
.offset
= search_start
;
1231 key
.type
= BTRFS_DEV_EXTENT_KEY
;
1233 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1237 ret
= btrfs_previous_item(root
, path
, key
.objectid
, key
.type
);
1244 slot
= path
->slots
[0];
1245 if (slot
>= btrfs_header_nritems(l
)) {
1246 ret
= btrfs_next_leaf(root
, path
);
1254 btrfs_item_key_to_cpu(l
, &key
, slot
);
1256 if (key
.objectid
< device
->devid
)
1259 if (key
.objectid
> device
->devid
)
1262 if (key
.type
!= BTRFS_DEV_EXTENT_KEY
)
1265 if (key
.offset
> search_start
) {
1266 hole_size
= key
.offset
- search_start
;
1269 * Have to check before we set max_hole_start, otherwise
1270 * we could end up sending back this offset anyway.
1272 if (contains_pending_extent(transaction
, device
,
1275 if (key
.offset
>= search_start
) {
1276 hole_size
= key
.offset
- search_start
;
1283 if (hole_size
> max_hole_size
) {
1284 max_hole_start
= search_start
;
1285 max_hole_size
= hole_size
;
1289 * If this free space is greater than which we need,
1290 * it must be the max free space that we have found
1291 * until now, so max_hole_start must point to the start
1292 * of this free space and the length of this free space
1293 * is stored in max_hole_size. Thus, we return
1294 * max_hole_start and max_hole_size and go back to the
1297 if (hole_size
>= num_bytes
) {
1303 dev_extent
= btrfs_item_ptr(l
, slot
, struct btrfs_dev_extent
);
1304 extent_end
= key
.offset
+ btrfs_dev_extent_length(l
,
1306 if (extent_end
> search_start
)
1307 search_start
= extent_end
;
1314 * At this point, search_start should be the end of
1315 * allocated dev extents, and when shrinking the device,
1316 * search_end may be smaller than search_start.
1318 if (search_end
> search_start
) {
1319 hole_size
= search_end
- search_start
;
1321 if (contains_pending_extent(transaction
, device
, &search_start
,
1323 btrfs_release_path(path
);
1327 if (hole_size
> max_hole_size
) {
1328 max_hole_start
= search_start
;
1329 max_hole_size
= hole_size
;
1334 if (max_hole_size
< num_bytes
)
1340 btrfs_free_path(path
);
1341 *start
= max_hole_start
;
1343 *len
= max_hole_size
;
1347 int find_free_dev_extent(struct btrfs_trans_handle
*trans
,
1348 struct btrfs_device
*device
, u64 num_bytes
,
1349 u64
*start
, u64
*len
)
1351 struct btrfs_root
*root
= device
->dev_root
;
1354 /* FIXME use last free of some kind */
1357 * we don't want to overwrite the superblock on the drive,
1358 * so we make sure to start at an offset of at least 1MB
1360 search_start
= max(root
->fs_info
->alloc_start
, 1024ull * 1024);
1361 return find_free_dev_extent_start(trans
->transaction
, device
,
1362 num_bytes
, search_start
, start
, len
);
1365 static int btrfs_free_dev_extent(struct btrfs_trans_handle
*trans
,
1366 struct btrfs_device
*device
,
1367 u64 start
, u64
*dev_extent_len
)
1370 struct btrfs_path
*path
;
1371 struct btrfs_root
*root
= device
->dev_root
;
1372 struct btrfs_key key
;
1373 struct btrfs_key found_key
;
1374 struct extent_buffer
*leaf
= NULL
;
1375 struct btrfs_dev_extent
*extent
= NULL
;
1377 path
= btrfs_alloc_path();
1381 key
.objectid
= device
->devid
;
1383 key
.type
= BTRFS_DEV_EXTENT_KEY
;
1385 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1387 ret
= btrfs_previous_item(root
, path
, key
.objectid
,
1388 BTRFS_DEV_EXTENT_KEY
);
1391 leaf
= path
->nodes
[0];
1392 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1393 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
1394 struct btrfs_dev_extent
);
1395 BUG_ON(found_key
.offset
> start
|| found_key
.offset
+
1396 btrfs_dev_extent_length(leaf
, extent
) < start
);
1398 btrfs_release_path(path
);
1400 } else if (ret
== 0) {
1401 leaf
= path
->nodes
[0];
1402 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
1403 struct btrfs_dev_extent
);
1405 btrfs_error(root
->fs_info
, ret
, "Slot search failed");
1409 *dev_extent_len
= btrfs_dev_extent_length(leaf
, extent
);
1411 ret
= btrfs_del_item(trans
, root
, path
);
1413 btrfs_error(root
->fs_info
, ret
,
1414 "Failed to remove dev extent item");
1416 trans
->transaction
->have_free_bgs
= 1;
1419 btrfs_free_path(path
);
1423 static int btrfs_alloc_dev_extent(struct btrfs_trans_handle
*trans
,
1424 struct btrfs_device
*device
,
1425 u64 chunk_tree
, u64 chunk_objectid
,
1426 u64 chunk_offset
, u64 start
, u64 num_bytes
)
1429 struct btrfs_path
*path
;
1430 struct btrfs_root
*root
= device
->dev_root
;
1431 struct btrfs_dev_extent
*extent
;
1432 struct extent_buffer
*leaf
;
1433 struct btrfs_key key
;
1435 WARN_ON(!device
->in_fs_metadata
);
1436 WARN_ON(device
->is_tgtdev_for_dev_replace
);
1437 path
= btrfs_alloc_path();
1441 key
.objectid
= device
->devid
;
1443 key
.type
= BTRFS_DEV_EXTENT_KEY
;
1444 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
1449 leaf
= path
->nodes
[0];
1450 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
1451 struct btrfs_dev_extent
);
1452 btrfs_set_dev_extent_chunk_tree(leaf
, extent
, chunk_tree
);
1453 btrfs_set_dev_extent_chunk_objectid(leaf
, extent
, chunk_objectid
);
1454 btrfs_set_dev_extent_chunk_offset(leaf
, extent
, chunk_offset
);
1456 write_extent_buffer(leaf
, root
->fs_info
->chunk_tree_uuid
,
1457 btrfs_dev_extent_chunk_tree_uuid(extent
), BTRFS_UUID_SIZE
);
1459 btrfs_set_dev_extent_length(leaf
, extent
, num_bytes
);
1460 btrfs_mark_buffer_dirty(leaf
);
1462 btrfs_free_path(path
);
1466 static u64
find_next_chunk(struct btrfs_fs_info
*fs_info
)
1468 struct extent_map_tree
*em_tree
;
1469 struct extent_map
*em
;
1473 em_tree
= &fs_info
->mapping_tree
.map_tree
;
1474 read_lock(&em_tree
->lock
);
1475 n
= rb_last(&em_tree
->map
);
1477 em
= rb_entry(n
, struct extent_map
, rb_node
);
1478 ret
= em
->start
+ em
->len
;
1480 read_unlock(&em_tree
->lock
);
1485 static noinline
int find_next_devid(struct btrfs_fs_info
*fs_info
,
1489 struct btrfs_key key
;
1490 struct btrfs_key found_key
;
1491 struct btrfs_path
*path
;
1493 path
= btrfs_alloc_path();
1497 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
1498 key
.type
= BTRFS_DEV_ITEM_KEY
;
1499 key
.offset
= (u64
)-1;
1501 ret
= btrfs_search_slot(NULL
, fs_info
->chunk_root
, &key
, path
, 0, 0);
1505 BUG_ON(ret
== 0); /* Corruption */
1507 ret
= btrfs_previous_item(fs_info
->chunk_root
, path
,
1508 BTRFS_DEV_ITEMS_OBJECTID
,
1509 BTRFS_DEV_ITEM_KEY
);
1513 btrfs_item_key_to_cpu(path
->nodes
[0], &found_key
,
1515 *devid_ret
= found_key
.offset
+ 1;
1519 btrfs_free_path(path
);
1524 * the device information is stored in the chunk root
1525 * the btrfs_device struct should be fully filled in
1527 static int btrfs_add_device(struct btrfs_trans_handle
*trans
,
1528 struct btrfs_root
*root
,
1529 struct btrfs_device
*device
)
1532 struct btrfs_path
*path
;
1533 struct btrfs_dev_item
*dev_item
;
1534 struct extent_buffer
*leaf
;
1535 struct btrfs_key key
;
1538 root
= root
->fs_info
->chunk_root
;
1540 path
= btrfs_alloc_path();
1544 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
1545 key
.type
= BTRFS_DEV_ITEM_KEY
;
1546 key
.offset
= device
->devid
;
1548 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
1553 leaf
= path
->nodes
[0];
1554 dev_item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_dev_item
);
1556 btrfs_set_device_id(leaf
, dev_item
, device
->devid
);
1557 btrfs_set_device_generation(leaf
, dev_item
, 0);
1558 btrfs_set_device_type(leaf
, dev_item
, device
->type
);
1559 btrfs_set_device_io_align(leaf
, dev_item
, device
->io_align
);
1560 btrfs_set_device_io_width(leaf
, dev_item
, device
->io_width
);
1561 btrfs_set_device_sector_size(leaf
, dev_item
, device
->sector_size
);
1562 btrfs_set_device_total_bytes(leaf
, dev_item
,
1563 btrfs_device_get_disk_total_bytes(device
));
1564 btrfs_set_device_bytes_used(leaf
, dev_item
,
1565 btrfs_device_get_bytes_used(device
));
1566 btrfs_set_device_group(leaf
, dev_item
, 0);
1567 btrfs_set_device_seek_speed(leaf
, dev_item
, 0);
1568 btrfs_set_device_bandwidth(leaf
, dev_item
, 0);
1569 btrfs_set_device_start_offset(leaf
, dev_item
, 0);
1571 ptr
= btrfs_device_uuid(dev_item
);
1572 write_extent_buffer(leaf
, device
->uuid
, ptr
, BTRFS_UUID_SIZE
);
1573 ptr
= btrfs_device_fsid(dev_item
);
1574 write_extent_buffer(leaf
, root
->fs_info
->fsid
, ptr
, BTRFS_UUID_SIZE
);
1575 btrfs_mark_buffer_dirty(leaf
);
1579 btrfs_free_path(path
);
1584 * Function to update ctime/mtime for a given device path.
1585 * Mainly used for ctime/mtime based probe like libblkid.
1587 static void update_dev_time(char *path_name
)
1591 filp
= filp_open(path_name
, O_RDWR
, 0);
1594 file_update_time(filp
);
1595 filp_close(filp
, NULL
);
1599 static int btrfs_rm_dev_item(struct btrfs_root
*root
,
1600 struct btrfs_device
*device
)
1603 struct btrfs_path
*path
;
1604 struct btrfs_key key
;
1605 struct btrfs_trans_handle
*trans
;
1607 root
= root
->fs_info
->chunk_root
;
1609 path
= btrfs_alloc_path();
1613 trans
= btrfs_start_transaction(root
, 0);
1614 if (IS_ERR(trans
)) {
1615 btrfs_free_path(path
);
1616 return PTR_ERR(trans
);
1618 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
1619 key
.type
= BTRFS_DEV_ITEM_KEY
;
1620 key
.offset
= device
->devid
;
1622 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1631 ret
= btrfs_del_item(trans
, root
, path
);
1635 btrfs_free_path(path
);
1636 btrfs_commit_transaction(trans
, root
);
1640 int btrfs_rm_device(struct btrfs_root
*root
, char *device_path
)
1642 struct btrfs_device
*device
;
1643 struct btrfs_device
*next_device
;
1644 struct block_device
*bdev
;
1645 struct buffer_head
*bh
= NULL
;
1646 struct btrfs_super_block
*disk_super
;
1647 struct btrfs_fs_devices
*cur_devices
;
1654 bool clear_super
= false;
1656 mutex_lock(&uuid_mutex
);
1659 seq
= read_seqbegin(&root
->fs_info
->profiles_lock
);
1661 all_avail
= root
->fs_info
->avail_data_alloc_bits
|
1662 root
->fs_info
->avail_system_alloc_bits
|
1663 root
->fs_info
->avail_metadata_alloc_bits
;
1664 } while (read_seqretry(&root
->fs_info
->profiles_lock
, seq
));
1666 num_devices
= root
->fs_info
->fs_devices
->num_devices
;
1667 btrfs_dev_replace_lock(&root
->fs_info
->dev_replace
);
1668 if (btrfs_dev_replace_is_ongoing(&root
->fs_info
->dev_replace
)) {
1669 WARN_ON(num_devices
< 1);
1672 btrfs_dev_replace_unlock(&root
->fs_info
->dev_replace
);
1674 if ((all_avail
& BTRFS_BLOCK_GROUP_RAID10
) && num_devices
<= 4) {
1675 ret
= BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET
;
1679 if ((all_avail
& BTRFS_BLOCK_GROUP_RAID1
) && num_devices
<= 2) {
1680 ret
= BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET
;
1684 if ((all_avail
& BTRFS_BLOCK_GROUP_RAID5
) &&
1685 root
->fs_info
->fs_devices
->rw_devices
<= 2) {
1686 ret
= BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET
;
1689 if ((all_avail
& BTRFS_BLOCK_GROUP_RAID6
) &&
1690 root
->fs_info
->fs_devices
->rw_devices
<= 3) {
1691 ret
= BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET
;
1695 if (strcmp(device_path
, "missing") == 0) {
1696 struct list_head
*devices
;
1697 struct btrfs_device
*tmp
;
1700 devices
= &root
->fs_info
->fs_devices
->devices
;
1702 * It is safe to read the devices since the volume_mutex
1705 list_for_each_entry(tmp
, devices
, dev_list
) {
1706 if (tmp
->in_fs_metadata
&&
1707 !tmp
->is_tgtdev_for_dev_replace
&&
1717 ret
= BTRFS_ERROR_DEV_MISSING_NOT_FOUND
;
1721 ret
= btrfs_get_bdev_and_sb(device_path
,
1722 FMODE_WRITE
| FMODE_EXCL
,
1723 root
->fs_info
->bdev_holder
, 0,
1727 disk_super
= (struct btrfs_super_block
*)bh
->b_data
;
1728 devid
= btrfs_stack_device_id(&disk_super
->dev_item
);
1729 dev_uuid
= disk_super
->dev_item
.uuid
;
1730 device
= btrfs_find_device(root
->fs_info
, devid
, dev_uuid
,
1738 if (device
->is_tgtdev_for_dev_replace
) {
1739 ret
= BTRFS_ERROR_DEV_TGT_REPLACE
;
1743 if (device
->writeable
&& root
->fs_info
->fs_devices
->rw_devices
== 1) {
1744 ret
= BTRFS_ERROR_DEV_ONLY_WRITABLE
;
1748 if (device
->writeable
) {
1750 list_del_init(&device
->dev_alloc_list
);
1751 device
->fs_devices
->rw_devices
--;
1752 unlock_chunks(root
);
1756 mutex_unlock(&uuid_mutex
);
1757 ret
= btrfs_shrink_device(device
, 0);
1758 mutex_lock(&uuid_mutex
);
1763 * TODO: the superblock still includes this device in its num_devices
1764 * counter although write_all_supers() is not locked out. This
1765 * could give a filesystem state which requires a degraded mount.
1767 ret
= btrfs_rm_dev_item(root
->fs_info
->chunk_root
, device
);
1771 device
->in_fs_metadata
= 0;
1772 btrfs_scrub_cancel_dev(root
->fs_info
, device
);
1775 * the device list mutex makes sure that we don't change
1776 * the device list while someone else is writing out all
1777 * the device supers. Whoever is writing all supers, should
1778 * lock the device list mutex before getting the number of
1779 * devices in the super block (super_copy). Conversely,
1780 * whoever updates the number of devices in the super block
1781 * (super_copy) should hold the device list mutex.
1784 cur_devices
= device
->fs_devices
;
1785 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
1786 list_del_rcu(&device
->dev_list
);
1788 device
->fs_devices
->num_devices
--;
1789 device
->fs_devices
->total_devices
--;
1791 if (device
->missing
)
1792 device
->fs_devices
->missing_devices
--;
1794 next_device
= list_entry(root
->fs_info
->fs_devices
->devices
.next
,
1795 struct btrfs_device
, dev_list
);
1796 if (device
->bdev
== root
->fs_info
->sb
->s_bdev
)
1797 root
->fs_info
->sb
->s_bdev
= next_device
->bdev
;
1798 if (device
->bdev
== root
->fs_info
->fs_devices
->latest_bdev
)
1799 root
->fs_info
->fs_devices
->latest_bdev
= next_device
->bdev
;
1802 device
->fs_devices
->open_devices
--;
1803 /* remove sysfs entry */
1804 btrfs_kobj_rm_device(root
->fs_info
->fs_devices
, device
);
1807 call_rcu(&device
->rcu
, free_device
);
1809 num_devices
= btrfs_super_num_devices(root
->fs_info
->super_copy
) - 1;
1810 btrfs_set_super_num_devices(root
->fs_info
->super_copy
, num_devices
);
1811 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
1813 if (cur_devices
->open_devices
== 0) {
1814 struct btrfs_fs_devices
*fs_devices
;
1815 fs_devices
= root
->fs_info
->fs_devices
;
1816 while (fs_devices
) {
1817 if (fs_devices
->seed
== cur_devices
) {
1818 fs_devices
->seed
= cur_devices
->seed
;
1821 fs_devices
= fs_devices
->seed
;
1823 cur_devices
->seed
= NULL
;
1824 __btrfs_close_devices(cur_devices
);
1825 free_fs_devices(cur_devices
);
1828 root
->fs_info
->num_tolerated_disk_barrier_failures
=
1829 btrfs_calc_num_tolerated_disk_barrier_failures(root
->fs_info
);
1832 * at this point, the device is zero sized. We want to
1833 * remove it from the devices list and zero out the old super
1835 if (clear_super
&& disk_super
) {
1839 /* make sure this device isn't detected as part of
1842 memset(&disk_super
->magic
, 0, sizeof(disk_super
->magic
));
1843 set_buffer_dirty(bh
);
1844 sync_dirty_buffer(bh
);
1846 /* clear the mirror copies of super block on the disk
1847 * being removed, 0th copy is been taken care above and
1848 * the below would take of the rest
1850 for (i
= 1; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
1851 bytenr
= btrfs_sb_offset(i
);
1852 if (bytenr
+ BTRFS_SUPER_INFO_SIZE
>=
1853 i_size_read(bdev
->bd_inode
))
1857 bh
= __bread(bdev
, bytenr
/ 4096,
1858 BTRFS_SUPER_INFO_SIZE
);
1862 disk_super
= (struct btrfs_super_block
*)bh
->b_data
;
1864 if (btrfs_super_bytenr(disk_super
) != bytenr
||
1865 btrfs_super_magic(disk_super
) != BTRFS_MAGIC
) {
1868 memset(&disk_super
->magic
, 0,
1869 sizeof(disk_super
->magic
));
1870 set_buffer_dirty(bh
);
1871 sync_dirty_buffer(bh
);
1878 /* Notify udev that device has changed */
1879 btrfs_kobject_uevent(bdev
, KOBJ_CHANGE
);
1881 /* Update ctime/mtime for device path for libblkid */
1882 update_dev_time(device_path
);
1888 blkdev_put(bdev
, FMODE_READ
| FMODE_EXCL
);
1890 mutex_unlock(&uuid_mutex
);
1893 if (device
->writeable
) {
1895 list_add(&device
->dev_alloc_list
,
1896 &root
->fs_info
->fs_devices
->alloc_list
);
1897 device
->fs_devices
->rw_devices
++;
1898 unlock_chunks(root
);
1903 void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_fs_info
*fs_info
,
1904 struct btrfs_device
*srcdev
)
1906 struct btrfs_fs_devices
*fs_devices
;
1908 WARN_ON(!mutex_is_locked(&fs_info
->fs_devices
->device_list_mutex
));
1911 * in case of fs with no seed, srcdev->fs_devices will point
1912 * to fs_devices of fs_info. However when the dev being replaced is
1913 * a seed dev it will point to the seed's local fs_devices. In short
1914 * srcdev will have its correct fs_devices in both the cases.
1916 fs_devices
= srcdev
->fs_devices
;
1918 list_del_rcu(&srcdev
->dev_list
);
1919 list_del_rcu(&srcdev
->dev_alloc_list
);
1920 fs_devices
->num_devices
--;
1921 if (srcdev
->missing
)
1922 fs_devices
->missing_devices
--;
1924 if (srcdev
->writeable
) {
1925 fs_devices
->rw_devices
--;
1926 /* zero out the old super if it is writable */
1927 btrfs_scratch_superblock(srcdev
);
1931 fs_devices
->open_devices
--;
1934 void btrfs_rm_dev_replace_free_srcdev(struct btrfs_fs_info
*fs_info
,
1935 struct btrfs_device
*srcdev
)
1937 struct btrfs_fs_devices
*fs_devices
= srcdev
->fs_devices
;
1939 call_rcu(&srcdev
->rcu
, free_device
);
1942 * unless fs_devices is seed fs, num_devices shouldn't go
1945 BUG_ON(!fs_devices
->num_devices
&& !fs_devices
->seeding
);
1947 /* if this is no devs we rather delete the fs_devices */
1948 if (!fs_devices
->num_devices
) {
1949 struct btrfs_fs_devices
*tmp_fs_devices
;
1951 tmp_fs_devices
= fs_info
->fs_devices
;
1952 while (tmp_fs_devices
) {
1953 if (tmp_fs_devices
->seed
== fs_devices
) {
1954 tmp_fs_devices
->seed
= fs_devices
->seed
;
1957 tmp_fs_devices
= tmp_fs_devices
->seed
;
1959 fs_devices
->seed
= NULL
;
1960 __btrfs_close_devices(fs_devices
);
1961 free_fs_devices(fs_devices
);
1965 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info
*fs_info
,
1966 struct btrfs_device
*tgtdev
)
1968 struct btrfs_device
*next_device
;
1970 mutex_lock(&uuid_mutex
);
1972 mutex_lock(&fs_info
->fs_devices
->device_list_mutex
);
1974 btrfs_kobj_rm_device(fs_info
->fs_devices
, tgtdev
);
1977 btrfs_scratch_superblock(tgtdev
);
1978 fs_info
->fs_devices
->open_devices
--;
1980 fs_info
->fs_devices
->num_devices
--;
1982 next_device
= list_entry(fs_info
->fs_devices
->devices
.next
,
1983 struct btrfs_device
, dev_list
);
1984 if (tgtdev
->bdev
== fs_info
->sb
->s_bdev
)
1985 fs_info
->sb
->s_bdev
= next_device
->bdev
;
1986 if (tgtdev
->bdev
== fs_info
->fs_devices
->latest_bdev
)
1987 fs_info
->fs_devices
->latest_bdev
= next_device
->bdev
;
1988 list_del_rcu(&tgtdev
->dev_list
);
1990 call_rcu(&tgtdev
->rcu
, free_device
);
1992 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
1993 mutex_unlock(&uuid_mutex
);
1996 static int btrfs_find_device_by_path(struct btrfs_root
*root
, char *device_path
,
1997 struct btrfs_device
**device
)
2000 struct btrfs_super_block
*disk_super
;
2003 struct block_device
*bdev
;
2004 struct buffer_head
*bh
;
2007 ret
= btrfs_get_bdev_and_sb(device_path
, FMODE_READ
,
2008 root
->fs_info
->bdev_holder
, 0, &bdev
, &bh
);
2011 disk_super
= (struct btrfs_super_block
*)bh
->b_data
;
2012 devid
= btrfs_stack_device_id(&disk_super
->dev_item
);
2013 dev_uuid
= disk_super
->dev_item
.uuid
;
2014 *device
= btrfs_find_device(root
->fs_info
, devid
, dev_uuid
,
2019 blkdev_put(bdev
, FMODE_READ
);
2023 int btrfs_find_device_missing_or_by_path(struct btrfs_root
*root
,
2025 struct btrfs_device
**device
)
2028 if (strcmp(device_path
, "missing") == 0) {
2029 struct list_head
*devices
;
2030 struct btrfs_device
*tmp
;
2032 devices
= &root
->fs_info
->fs_devices
->devices
;
2034 * It is safe to read the devices since the volume_mutex
2035 * is held by the caller.
2037 list_for_each_entry(tmp
, devices
, dev_list
) {
2038 if (tmp
->in_fs_metadata
&& !tmp
->bdev
) {
2045 btrfs_err(root
->fs_info
, "no missing device found");
2051 return btrfs_find_device_by_path(root
, device_path
, device
);
2056 * does all the dirty work required for changing file system's UUID.
2058 static int btrfs_prepare_sprout(struct btrfs_root
*root
)
2060 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
2061 struct btrfs_fs_devices
*old_devices
;
2062 struct btrfs_fs_devices
*seed_devices
;
2063 struct btrfs_super_block
*disk_super
= root
->fs_info
->super_copy
;
2064 struct btrfs_device
*device
;
2067 BUG_ON(!mutex_is_locked(&uuid_mutex
));
2068 if (!fs_devices
->seeding
)
2071 seed_devices
= __alloc_fs_devices();
2072 if (IS_ERR(seed_devices
))
2073 return PTR_ERR(seed_devices
);
2075 old_devices
= clone_fs_devices(fs_devices
);
2076 if (IS_ERR(old_devices
)) {
2077 kfree(seed_devices
);
2078 return PTR_ERR(old_devices
);
2081 list_add(&old_devices
->list
, &fs_uuids
);
2083 memcpy(seed_devices
, fs_devices
, sizeof(*seed_devices
));
2084 seed_devices
->opened
= 1;
2085 INIT_LIST_HEAD(&seed_devices
->devices
);
2086 INIT_LIST_HEAD(&seed_devices
->alloc_list
);
2087 mutex_init(&seed_devices
->device_list_mutex
);
2089 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
2090 list_splice_init_rcu(&fs_devices
->devices
, &seed_devices
->devices
,
2092 list_for_each_entry(device
, &seed_devices
->devices
, dev_list
)
2093 device
->fs_devices
= seed_devices
;
2096 list_splice_init(&fs_devices
->alloc_list
, &seed_devices
->alloc_list
);
2097 unlock_chunks(root
);
2099 fs_devices
->seeding
= 0;
2100 fs_devices
->num_devices
= 0;
2101 fs_devices
->open_devices
= 0;
2102 fs_devices
->missing_devices
= 0;
2103 fs_devices
->rotating
= 0;
2104 fs_devices
->seed
= seed_devices
;
2106 generate_random_uuid(fs_devices
->fsid
);
2107 memcpy(root
->fs_info
->fsid
, fs_devices
->fsid
, BTRFS_FSID_SIZE
);
2108 memcpy(disk_super
->fsid
, fs_devices
->fsid
, BTRFS_FSID_SIZE
);
2109 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
2111 super_flags
= btrfs_super_flags(disk_super
) &
2112 ~BTRFS_SUPER_FLAG_SEEDING
;
2113 btrfs_set_super_flags(disk_super
, super_flags
);
2119 * strore the expected generation for seed devices in device items.
2121 static int btrfs_finish_sprout(struct btrfs_trans_handle
*trans
,
2122 struct btrfs_root
*root
)
2124 struct btrfs_path
*path
;
2125 struct extent_buffer
*leaf
;
2126 struct btrfs_dev_item
*dev_item
;
2127 struct btrfs_device
*device
;
2128 struct btrfs_key key
;
2129 u8 fs_uuid
[BTRFS_UUID_SIZE
];
2130 u8 dev_uuid
[BTRFS_UUID_SIZE
];
2134 path
= btrfs_alloc_path();
2138 root
= root
->fs_info
->chunk_root
;
2139 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
2141 key
.type
= BTRFS_DEV_ITEM_KEY
;
2144 ret
= btrfs_search_slot(trans
, root
, &key
, path
, 0, 1);
2148 leaf
= path
->nodes
[0];
2150 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
2151 ret
= btrfs_next_leaf(root
, path
);
2156 leaf
= path
->nodes
[0];
2157 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2158 btrfs_release_path(path
);
2162 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2163 if (key
.objectid
!= BTRFS_DEV_ITEMS_OBJECTID
||
2164 key
.type
!= BTRFS_DEV_ITEM_KEY
)
2167 dev_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
2168 struct btrfs_dev_item
);
2169 devid
= btrfs_device_id(leaf
, dev_item
);
2170 read_extent_buffer(leaf
, dev_uuid
, btrfs_device_uuid(dev_item
),
2172 read_extent_buffer(leaf
, fs_uuid
, btrfs_device_fsid(dev_item
),
2174 device
= btrfs_find_device(root
->fs_info
, devid
, dev_uuid
,
2176 BUG_ON(!device
); /* Logic error */
2178 if (device
->fs_devices
->seeding
) {
2179 btrfs_set_device_generation(leaf
, dev_item
,
2180 device
->generation
);
2181 btrfs_mark_buffer_dirty(leaf
);
2189 btrfs_free_path(path
);
2193 int btrfs_init_new_device(struct btrfs_root
*root
, char *device_path
)
2195 struct request_queue
*q
;
2196 struct btrfs_trans_handle
*trans
;
2197 struct btrfs_device
*device
;
2198 struct block_device
*bdev
;
2199 struct list_head
*devices
;
2200 struct super_block
*sb
= root
->fs_info
->sb
;
2201 struct rcu_string
*name
;
2203 int seeding_dev
= 0;
2206 if ((sb
->s_flags
& MS_RDONLY
) && !root
->fs_info
->fs_devices
->seeding
)
2209 bdev
= blkdev_get_by_path(device_path
, FMODE_WRITE
| FMODE_EXCL
,
2210 root
->fs_info
->bdev_holder
);
2212 return PTR_ERR(bdev
);
2214 if (root
->fs_info
->fs_devices
->seeding
) {
2216 down_write(&sb
->s_umount
);
2217 mutex_lock(&uuid_mutex
);
2220 filemap_write_and_wait(bdev
->bd_inode
->i_mapping
);
2222 devices
= &root
->fs_info
->fs_devices
->devices
;
2224 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
2225 list_for_each_entry(device
, devices
, dev_list
) {
2226 if (device
->bdev
== bdev
) {
2229 &root
->fs_info
->fs_devices
->device_list_mutex
);
2233 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
2235 device
= btrfs_alloc_device(root
->fs_info
, NULL
, NULL
);
2236 if (IS_ERR(device
)) {
2237 /* we can safely leave the fs_devices entry around */
2238 ret
= PTR_ERR(device
);
2242 name
= rcu_string_strdup(device_path
, GFP_NOFS
);
2248 rcu_assign_pointer(device
->name
, name
);
2250 trans
= btrfs_start_transaction(root
, 0);
2251 if (IS_ERR(trans
)) {
2252 rcu_string_free(device
->name
);
2254 ret
= PTR_ERR(trans
);
2258 q
= bdev_get_queue(bdev
);
2259 if (blk_queue_discard(q
))
2260 device
->can_discard
= 1;
2261 device
->writeable
= 1;
2262 device
->generation
= trans
->transid
;
2263 device
->io_width
= root
->sectorsize
;
2264 device
->io_align
= root
->sectorsize
;
2265 device
->sector_size
= root
->sectorsize
;
2266 device
->total_bytes
= i_size_read(bdev
->bd_inode
);
2267 device
->disk_total_bytes
= device
->total_bytes
;
2268 device
->commit_total_bytes
= device
->total_bytes
;
2269 device
->dev_root
= root
->fs_info
->dev_root
;
2270 device
->bdev
= bdev
;
2271 device
->in_fs_metadata
= 1;
2272 device
->is_tgtdev_for_dev_replace
= 0;
2273 device
->mode
= FMODE_EXCL
;
2274 device
->dev_stats_valid
= 1;
2275 set_blocksize(device
->bdev
, 4096);
2278 sb
->s_flags
&= ~MS_RDONLY
;
2279 ret
= btrfs_prepare_sprout(root
);
2280 BUG_ON(ret
); /* -ENOMEM */
2283 device
->fs_devices
= root
->fs_info
->fs_devices
;
2285 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
2287 list_add_rcu(&device
->dev_list
, &root
->fs_info
->fs_devices
->devices
);
2288 list_add(&device
->dev_alloc_list
,
2289 &root
->fs_info
->fs_devices
->alloc_list
);
2290 root
->fs_info
->fs_devices
->num_devices
++;
2291 root
->fs_info
->fs_devices
->open_devices
++;
2292 root
->fs_info
->fs_devices
->rw_devices
++;
2293 root
->fs_info
->fs_devices
->total_devices
++;
2294 root
->fs_info
->fs_devices
->total_rw_bytes
+= device
->total_bytes
;
2296 spin_lock(&root
->fs_info
->free_chunk_lock
);
2297 root
->fs_info
->free_chunk_space
+= device
->total_bytes
;
2298 spin_unlock(&root
->fs_info
->free_chunk_lock
);
2300 if (!blk_queue_nonrot(bdev_get_queue(bdev
)))
2301 root
->fs_info
->fs_devices
->rotating
= 1;
2303 tmp
= btrfs_super_total_bytes(root
->fs_info
->super_copy
);
2304 btrfs_set_super_total_bytes(root
->fs_info
->super_copy
,
2305 tmp
+ device
->total_bytes
);
2307 tmp
= btrfs_super_num_devices(root
->fs_info
->super_copy
);
2308 btrfs_set_super_num_devices(root
->fs_info
->super_copy
,
2311 /* add sysfs device entry */
2312 btrfs_kobj_add_device(root
->fs_info
->fs_devices
, device
);
2315 * we've got more storage, clear any full flags on the space
2318 btrfs_clear_space_info_full(root
->fs_info
);
2320 unlock_chunks(root
);
2321 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
2325 ret
= init_first_rw_device(trans
, root
, device
);
2326 unlock_chunks(root
);
2328 btrfs_abort_transaction(trans
, root
, ret
);
2333 ret
= btrfs_add_device(trans
, root
, device
);
2335 btrfs_abort_transaction(trans
, root
, ret
);
2340 char fsid_buf
[BTRFS_UUID_UNPARSED_SIZE
];
2342 ret
= btrfs_finish_sprout(trans
, root
);
2344 btrfs_abort_transaction(trans
, root
, ret
);
2348 /* Sprouting would change fsid of the mounted root,
2349 * so rename the fsid on the sysfs
2351 snprintf(fsid_buf
, BTRFS_UUID_UNPARSED_SIZE
, "%pU",
2352 root
->fs_info
->fsid
);
2353 if (kobject_rename(&root
->fs_info
->fs_devices
->super_kobj
,
2355 pr_warn("BTRFS: sysfs: failed to create fsid for sprout\n");
2358 root
->fs_info
->num_tolerated_disk_barrier_failures
=
2359 btrfs_calc_num_tolerated_disk_barrier_failures(root
->fs_info
);
2360 ret
= btrfs_commit_transaction(trans
, root
);
2363 mutex_unlock(&uuid_mutex
);
2364 up_write(&sb
->s_umount
);
2366 if (ret
) /* transaction commit */
2369 ret
= btrfs_relocate_sys_chunks(root
);
2371 btrfs_error(root
->fs_info
, ret
,
2372 "Failed to relocate sys chunks after "
2373 "device initialization. This can be fixed "
2374 "using the \"btrfs balance\" command.");
2375 trans
= btrfs_attach_transaction(root
);
2376 if (IS_ERR(trans
)) {
2377 if (PTR_ERR(trans
) == -ENOENT
)
2379 return PTR_ERR(trans
);
2381 ret
= btrfs_commit_transaction(trans
, root
);
2384 /* Update ctime/mtime for libblkid */
2385 update_dev_time(device_path
);
2389 btrfs_end_transaction(trans
, root
);
2390 rcu_string_free(device
->name
);
2391 btrfs_kobj_rm_device(root
->fs_info
->fs_devices
, device
);
2394 blkdev_put(bdev
, FMODE_EXCL
);
2396 mutex_unlock(&uuid_mutex
);
2397 up_write(&sb
->s_umount
);
2402 int btrfs_init_dev_replace_tgtdev(struct btrfs_root
*root
, char *device_path
,
2403 struct btrfs_device
*srcdev
,
2404 struct btrfs_device
**device_out
)
2406 struct request_queue
*q
;
2407 struct btrfs_device
*device
;
2408 struct block_device
*bdev
;
2409 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2410 struct list_head
*devices
;
2411 struct rcu_string
*name
;
2412 u64 devid
= BTRFS_DEV_REPLACE_DEVID
;
2416 if (fs_info
->fs_devices
->seeding
) {
2417 btrfs_err(fs_info
, "the filesystem is a seed filesystem!");
2421 bdev
= blkdev_get_by_path(device_path
, FMODE_WRITE
| FMODE_EXCL
,
2422 fs_info
->bdev_holder
);
2424 btrfs_err(fs_info
, "target device %s is invalid!", device_path
);
2425 return PTR_ERR(bdev
);
2428 filemap_write_and_wait(bdev
->bd_inode
->i_mapping
);
2430 devices
= &fs_info
->fs_devices
->devices
;
2431 list_for_each_entry(device
, devices
, dev_list
) {
2432 if (device
->bdev
== bdev
) {
2433 btrfs_err(fs_info
, "target device is in the filesystem!");
2440 if (i_size_read(bdev
->bd_inode
) <
2441 btrfs_device_get_total_bytes(srcdev
)) {
2442 btrfs_err(fs_info
, "target device is smaller than source device!");
2448 device
= btrfs_alloc_device(NULL
, &devid
, NULL
);
2449 if (IS_ERR(device
)) {
2450 ret
= PTR_ERR(device
);
2454 name
= rcu_string_strdup(device_path
, GFP_NOFS
);
2460 rcu_assign_pointer(device
->name
, name
);
2462 q
= bdev_get_queue(bdev
);
2463 if (blk_queue_discard(q
))
2464 device
->can_discard
= 1;
2465 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
2466 device
->writeable
= 1;
2467 device
->generation
= 0;
2468 device
->io_width
= root
->sectorsize
;
2469 device
->io_align
= root
->sectorsize
;
2470 device
->sector_size
= root
->sectorsize
;
2471 device
->total_bytes
= btrfs_device_get_total_bytes(srcdev
);
2472 device
->disk_total_bytes
= btrfs_device_get_disk_total_bytes(srcdev
);
2473 device
->bytes_used
= btrfs_device_get_bytes_used(srcdev
);
2474 ASSERT(list_empty(&srcdev
->resized_list
));
2475 device
->commit_total_bytes
= srcdev
->commit_total_bytes
;
2476 device
->commit_bytes_used
= device
->bytes_used
;
2477 device
->dev_root
= fs_info
->dev_root
;
2478 device
->bdev
= bdev
;
2479 device
->in_fs_metadata
= 1;
2480 device
->is_tgtdev_for_dev_replace
= 1;
2481 device
->mode
= FMODE_EXCL
;
2482 device
->dev_stats_valid
= 1;
2483 set_blocksize(device
->bdev
, 4096);
2484 device
->fs_devices
= fs_info
->fs_devices
;
2485 list_add(&device
->dev_list
, &fs_info
->fs_devices
->devices
);
2486 fs_info
->fs_devices
->num_devices
++;
2487 fs_info
->fs_devices
->open_devices
++;
2488 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
2490 *device_out
= device
;
2494 blkdev_put(bdev
, FMODE_EXCL
);
2498 void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info
*fs_info
,
2499 struct btrfs_device
*tgtdev
)
2501 WARN_ON(fs_info
->fs_devices
->rw_devices
== 0);
2502 tgtdev
->io_width
= fs_info
->dev_root
->sectorsize
;
2503 tgtdev
->io_align
= fs_info
->dev_root
->sectorsize
;
2504 tgtdev
->sector_size
= fs_info
->dev_root
->sectorsize
;
2505 tgtdev
->dev_root
= fs_info
->dev_root
;
2506 tgtdev
->in_fs_metadata
= 1;
2509 static noinline
int btrfs_update_device(struct btrfs_trans_handle
*trans
,
2510 struct btrfs_device
*device
)
2513 struct btrfs_path
*path
;
2514 struct btrfs_root
*root
;
2515 struct btrfs_dev_item
*dev_item
;
2516 struct extent_buffer
*leaf
;
2517 struct btrfs_key key
;
2519 root
= device
->dev_root
->fs_info
->chunk_root
;
2521 path
= btrfs_alloc_path();
2525 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
2526 key
.type
= BTRFS_DEV_ITEM_KEY
;
2527 key
.offset
= device
->devid
;
2529 ret
= btrfs_search_slot(trans
, root
, &key
, path
, 0, 1);
2538 leaf
= path
->nodes
[0];
2539 dev_item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_dev_item
);
2541 btrfs_set_device_id(leaf
, dev_item
, device
->devid
);
2542 btrfs_set_device_type(leaf
, dev_item
, device
->type
);
2543 btrfs_set_device_io_align(leaf
, dev_item
, device
->io_align
);
2544 btrfs_set_device_io_width(leaf
, dev_item
, device
->io_width
);
2545 btrfs_set_device_sector_size(leaf
, dev_item
, device
->sector_size
);
2546 btrfs_set_device_total_bytes(leaf
, dev_item
,
2547 btrfs_device_get_disk_total_bytes(device
));
2548 btrfs_set_device_bytes_used(leaf
, dev_item
,
2549 btrfs_device_get_bytes_used(device
));
2550 btrfs_mark_buffer_dirty(leaf
);
2553 btrfs_free_path(path
);
2557 int btrfs_grow_device(struct btrfs_trans_handle
*trans
,
2558 struct btrfs_device
*device
, u64 new_size
)
2560 struct btrfs_super_block
*super_copy
=
2561 device
->dev_root
->fs_info
->super_copy
;
2562 struct btrfs_fs_devices
*fs_devices
;
2566 if (!device
->writeable
)
2569 lock_chunks(device
->dev_root
);
2570 old_total
= btrfs_super_total_bytes(super_copy
);
2571 diff
= new_size
- device
->total_bytes
;
2573 if (new_size
<= device
->total_bytes
||
2574 device
->is_tgtdev_for_dev_replace
) {
2575 unlock_chunks(device
->dev_root
);
2579 fs_devices
= device
->dev_root
->fs_info
->fs_devices
;
2581 btrfs_set_super_total_bytes(super_copy
, old_total
+ diff
);
2582 device
->fs_devices
->total_rw_bytes
+= diff
;
2584 btrfs_device_set_total_bytes(device
, new_size
);
2585 btrfs_device_set_disk_total_bytes(device
, new_size
);
2586 btrfs_clear_space_info_full(device
->dev_root
->fs_info
);
2587 if (list_empty(&device
->resized_list
))
2588 list_add_tail(&device
->resized_list
,
2589 &fs_devices
->resized_devices
);
2590 unlock_chunks(device
->dev_root
);
2592 return btrfs_update_device(trans
, device
);
2595 static int btrfs_free_chunk(struct btrfs_trans_handle
*trans
,
2596 struct btrfs_root
*root
, u64 chunk_objectid
,
2600 struct btrfs_path
*path
;
2601 struct btrfs_key key
;
2603 root
= root
->fs_info
->chunk_root
;
2604 path
= btrfs_alloc_path();
2608 key
.objectid
= chunk_objectid
;
2609 key
.offset
= chunk_offset
;
2610 key
.type
= BTRFS_CHUNK_ITEM_KEY
;
2612 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
2615 else if (ret
> 0) { /* Logic error or corruption */
2616 btrfs_error(root
->fs_info
, -ENOENT
,
2617 "Failed lookup while freeing chunk.");
2622 ret
= btrfs_del_item(trans
, root
, path
);
2624 btrfs_error(root
->fs_info
, ret
,
2625 "Failed to delete chunk item.");
2627 btrfs_free_path(path
);
2631 static int btrfs_del_sys_chunk(struct btrfs_root
*root
, u64 chunk_objectid
, u64
2634 struct btrfs_super_block
*super_copy
= root
->fs_info
->super_copy
;
2635 struct btrfs_disk_key
*disk_key
;
2636 struct btrfs_chunk
*chunk
;
2643 struct btrfs_key key
;
2646 array_size
= btrfs_super_sys_array_size(super_copy
);
2648 ptr
= super_copy
->sys_chunk_array
;
2651 while (cur
< array_size
) {
2652 disk_key
= (struct btrfs_disk_key
*)ptr
;
2653 btrfs_disk_key_to_cpu(&key
, disk_key
);
2655 len
= sizeof(*disk_key
);
2657 if (key
.type
== BTRFS_CHUNK_ITEM_KEY
) {
2658 chunk
= (struct btrfs_chunk
*)(ptr
+ len
);
2659 num_stripes
= btrfs_stack_chunk_num_stripes(chunk
);
2660 len
+= btrfs_chunk_item_size(num_stripes
);
2665 if (key
.objectid
== chunk_objectid
&&
2666 key
.offset
== chunk_offset
) {
2667 memmove(ptr
, ptr
+ len
, array_size
- (cur
+ len
));
2669 btrfs_set_super_sys_array_size(super_copy
, array_size
);
2675 unlock_chunks(root
);
2679 int btrfs_remove_chunk(struct btrfs_trans_handle
*trans
,
2680 struct btrfs_root
*root
, u64 chunk_offset
)
2682 struct extent_map_tree
*em_tree
;
2683 struct extent_map
*em
;
2684 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
2685 struct map_lookup
*map
;
2686 u64 dev_extent_len
= 0;
2687 u64 chunk_objectid
= BTRFS_FIRST_CHUNK_TREE_OBJECTID
;
2691 root
= root
->fs_info
->chunk_root
;
2692 em_tree
= &root
->fs_info
->mapping_tree
.map_tree
;
2694 read_lock(&em_tree
->lock
);
2695 em
= lookup_extent_mapping(em_tree
, chunk_offset
, 1);
2696 read_unlock(&em_tree
->lock
);
2698 if (!em
|| em
->start
> chunk_offset
||
2699 em
->start
+ em
->len
< chunk_offset
) {
2701 * This is a logic error, but we don't want to just rely on the
2702 * user having built with ASSERT enabled, so if ASSERT doens't
2703 * do anything we still error out.
2707 free_extent_map(em
);
2710 map
= (struct map_lookup
*)em
->bdev
;
2711 lock_chunks(root
->fs_info
->chunk_root
);
2712 check_system_chunk(trans
, extent_root
, map
->type
);
2713 unlock_chunks(root
->fs_info
->chunk_root
);
2715 for (i
= 0; i
< map
->num_stripes
; i
++) {
2716 struct btrfs_device
*device
= map
->stripes
[i
].dev
;
2717 ret
= btrfs_free_dev_extent(trans
, device
,
2718 map
->stripes
[i
].physical
,
2721 btrfs_abort_transaction(trans
, root
, ret
);
2725 if (device
->bytes_used
> 0) {
2727 btrfs_device_set_bytes_used(device
,
2728 device
->bytes_used
- dev_extent_len
);
2729 spin_lock(&root
->fs_info
->free_chunk_lock
);
2730 root
->fs_info
->free_chunk_space
+= dev_extent_len
;
2731 spin_unlock(&root
->fs_info
->free_chunk_lock
);
2732 btrfs_clear_space_info_full(root
->fs_info
);
2733 unlock_chunks(root
);
2736 if (map
->stripes
[i
].dev
) {
2737 ret
= btrfs_update_device(trans
, map
->stripes
[i
].dev
);
2739 btrfs_abort_transaction(trans
, root
, ret
);
2744 ret
= btrfs_free_chunk(trans
, root
, chunk_objectid
, chunk_offset
);
2746 btrfs_abort_transaction(trans
, root
, ret
);
2750 trace_btrfs_chunk_free(root
, map
, chunk_offset
, em
->len
);
2752 if (map
->type
& BTRFS_BLOCK_GROUP_SYSTEM
) {
2753 ret
= btrfs_del_sys_chunk(root
, chunk_objectid
, chunk_offset
);
2755 btrfs_abort_transaction(trans
, root
, ret
);
2760 ret
= btrfs_remove_block_group(trans
, extent_root
, chunk_offset
, em
);
2762 btrfs_abort_transaction(trans
, extent_root
, ret
);
2768 free_extent_map(em
);
2772 static int btrfs_relocate_chunk(struct btrfs_root
*root
, u64 chunk_offset
)
2774 struct btrfs_root
*extent_root
;
2775 struct btrfs_trans_handle
*trans
;
2778 root
= root
->fs_info
->chunk_root
;
2779 extent_root
= root
->fs_info
->extent_root
;
2782 * Prevent races with automatic removal of unused block groups.
2783 * After we relocate and before we remove the chunk with offset
2784 * chunk_offset, automatic removal of the block group can kick in,
2785 * resulting in a failure when calling btrfs_remove_chunk() below.
2787 * Make sure to acquire this mutex before doing a tree search (dev
2788 * or chunk trees) to find chunks. Otherwise the cleaner kthread might
2789 * call btrfs_remove_chunk() (through btrfs_delete_unused_bgs()) after
2790 * we release the path used to search the chunk/dev tree and before
2791 * the current task acquires this mutex and calls us.
2793 ASSERT(mutex_is_locked(&root
->fs_info
->delete_unused_bgs_mutex
));
2795 ret
= btrfs_can_relocate(extent_root
, chunk_offset
);
2799 /* step one, relocate all the extents inside this chunk */
2800 btrfs_scrub_pause(root
);
2801 ret
= btrfs_relocate_block_group(extent_root
, chunk_offset
);
2802 btrfs_scrub_continue(root
);
2806 trans
= btrfs_start_transaction(root
, 0);
2807 if (IS_ERR(trans
)) {
2808 ret
= PTR_ERR(trans
);
2809 btrfs_std_error(root
->fs_info
, ret
);
2814 * step two, delete the device extents and the
2815 * chunk tree entries
2817 ret
= btrfs_remove_chunk(trans
, root
, chunk_offset
);
2818 btrfs_end_transaction(trans
, root
);
2822 static int btrfs_relocate_sys_chunks(struct btrfs_root
*root
)
2824 struct btrfs_root
*chunk_root
= root
->fs_info
->chunk_root
;
2825 struct btrfs_path
*path
;
2826 struct extent_buffer
*leaf
;
2827 struct btrfs_chunk
*chunk
;
2828 struct btrfs_key key
;
2829 struct btrfs_key found_key
;
2831 bool retried
= false;
2835 path
= btrfs_alloc_path();
2840 key
.objectid
= BTRFS_FIRST_CHUNK_TREE_OBJECTID
;
2841 key
.offset
= (u64
)-1;
2842 key
.type
= BTRFS_CHUNK_ITEM_KEY
;
2845 mutex_lock(&root
->fs_info
->delete_unused_bgs_mutex
);
2846 ret
= btrfs_search_slot(NULL
, chunk_root
, &key
, path
, 0, 0);
2848 mutex_unlock(&root
->fs_info
->delete_unused_bgs_mutex
);
2851 BUG_ON(ret
== 0); /* Corruption */
2853 ret
= btrfs_previous_item(chunk_root
, path
, key
.objectid
,
2856 mutex_unlock(&root
->fs_info
->delete_unused_bgs_mutex
);
2862 leaf
= path
->nodes
[0];
2863 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
2865 chunk
= btrfs_item_ptr(leaf
, path
->slots
[0],
2866 struct btrfs_chunk
);
2867 chunk_type
= btrfs_chunk_type(leaf
, chunk
);
2868 btrfs_release_path(path
);
2870 if (chunk_type
& BTRFS_BLOCK_GROUP_SYSTEM
) {
2871 ret
= btrfs_relocate_chunk(chunk_root
,
2878 mutex_unlock(&root
->fs_info
->delete_unused_bgs_mutex
);
2880 if (found_key
.offset
== 0)
2882 key
.offset
= found_key
.offset
- 1;
2885 if (failed
&& !retried
) {
2889 } else if (WARN_ON(failed
&& retried
)) {
2893 btrfs_free_path(path
);
2897 static int insert_balance_item(struct btrfs_root
*root
,
2898 struct btrfs_balance_control
*bctl
)
2900 struct btrfs_trans_handle
*trans
;
2901 struct btrfs_balance_item
*item
;
2902 struct btrfs_disk_balance_args disk_bargs
;
2903 struct btrfs_path
*path
;
2904 struct extent_buffer
*leaf
;
2905 struct btrfs_key key
;
2908 path
= btrfs_alloc_path();
2912 trans
= btrfs_start_transaction(root
, 0);
2913 if (IS_ERR(trans
)) {
2914 btrfs_free_path(path
);
2915 return PTR_ERR(trans
);
2918 key
.objectid
= BTRFS_BALANCE_OBJECTID
;
2919 key
.type
= BTRFS_BALANCE_ITEM_KEY
;
2922 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2927 leaf
= path
->nodes
[0];
2928 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_balance_item
);
2930 memset_extent_buffer(leaf
, 0, (unsigned long)item
, sizeof(*item
));
2932 btrfs_cpu_balance_args_to_disk(&disk_bargs
, &bctl
->data
);
2933 btrfs_set_balance_data(leaf
, item
, &disk_bargs
);
2934 btrfs_cpu_balance_args_to_disk(&disk_bargs
, &bctl
->meta
);
2935 btrfs_set_balance_meta(leaf
, item
, &disk_bargs
);
2936 btrfs_cpu_balance_args_to_disk(&disk_bargs
, &bctl
->sys
);
2937 btrfs_set_balance_sys(leaf
, item
, &disk_bargs
);
2939 btrfs_set_balance_flags(leaf
, item
, bctl
->flags
);
2941 btrfs_mark_buffer_dirty(leaf
);
2943 btrfs_free_path(path
);
2944 err
= btrfs_commit_transaction(trans
, root
);
2950 static int del_balance_item(struct btrfs_root
*root
)
2952 struct btrfs_trans_handle
*trans
;
2953 struct btrfs_path
*path
;
2954 struct btrfs_key key
;
2957 path
= btrfs_alloc_path();
2961 trans
= btrfs_start_transaction(root
, 0);
2962 if (IS_ERR(trans
)) {
2963 btrfs_free_path(path
);
2964 return PTR_ERR(trans
);
2967 key
.objectid
= BTRFS_BALANCE_OBJECTID
;
2968 key
.type
= BTRFS_BALANCE_ITEM_KEY
;
2971 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
2979 ret
= btrfs_del_item(trans
, root
, path
);
2981 btrfs_free_path(path
);
2982 err
= btrfs_commit_transaction(trans
, root
);
2989 * This is a heuristic used to reduce the number of chunks balanced on
2990 * resume after balance was interrupted.
2992 static void update_balance_args(struct btrfs_balance_control
*bctl
)
2995 * Turn on soft mode for chunk types that were being converted.
2997 if (bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)
2998 bctl
->data
.flags
|= BTRFS_BALANCE_ARGS_SOFT
;
2999 if (bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)
3000 bctl
->sys
.flags
|= BTRFS_BALANCE_ARGS_SOFT
;
3001 if (bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)
3002 bctl
->meta
.flags
|= BTRFS_BALANCE_ARGS_SOFT
;
3005 * Turn on usage filter if is not already used. The idea is
3006 * that chunks that we have already balanced should be
3007 * reasonably full. Don't do it for chunks that are being
3008 * converted - that will keep us from relocating unconverted
3009 * (albeit full) chunks.
3011 if (!(bctl
->data
.flags
& BTRFS_BALANCE_ARGS_USAGE
) &&
3012 !(bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)) {
3013 bctl
->data
.flags
|= BTRFS_BALANCE_ARGS_USAGE
;
3014 bctl
->data
.usage
= 90;
3016 if (!(bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_USAGE
) &&
3017 !(bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)) {
3018 bctl
->sys
.flags
|= BTRFS_BALANCE_ARGS_USAGE
;
3019 bctl
->sys
.usage
= 90;
3021 if (!(bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_USAGE
) &&
3022 !(bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)) {
3023 bctl
->meta
.flags
|= BTRFS_BALANCE_ARGS_USAGE
;
3024 bctl
->meta
.usage
= 90;
3029 * Should be called with both balance and volume mutexes held to
3030 * serialize other volume operations (add_dev/rm_dev/resize) with
3031 * restriper. Same goes for unset_balance_control.
3033 static void set_balance_control(struct btrfs_balance_control
*bctl
)
3035 struct btrfs_fs_info
*fs_info
= bctl
->fs_info
;
3037 BUG_ON(fs_info
->balance_ctl
);
3039 spin_lock(&fs_info
->balance_lock
);
3040 fs_info
->balance_ctl
= bctl
;
3041 spin_unlock(&fs_info
->balance_lock
);
3044 static void unset_balance_control(struct btrfs_fs_info
*fs_info
)
3046 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
3048 BUG_ON(!fs_info
->balance_ctl
);
3050 spin_lock(&fs_info
->balance_lock
);
3051 fs_info
->balance_ctl
= NULL
;
3052 spin_unlock(&fs_info
->balance_lock
);
3058 * Balance filters. Return 1 if chunk should be filtered out
3059 * (should not be balanced).
3061 static int chunk_profiles_filter(u64 chunk_type
,
3062 struct btrfs_balance_args
*bargs
)
3064 chunk_type
= chunk_to_extended(chunk_type
) &
3065 BTRFS_EXTENDED_PROFILE_MASK
;
3067 if (bargs
->profiles
& chunk_type
)
3073 static int chunk_usage_filter(struct btrfs_fs_info
*fs_info
, u64 chunk_offset
,
3074 struct btrfs_balance_args
*bargs
)
3076 struct btrfs_block_group_cache
*cache
;
3077 u64 chunk_used
, user_thresh
;
3080 cache
= btrfs_lookup_block_group(fs_info
, chunk_offset
);
3081 chunk_used
= btrfs_block_group_used(&cache
->item
);
3083 if (bargs
->usage
== 0)
3085 else if (bargs
->usage
> 100)
3086 user_thresh
= cache
->key
.offset
;
3088 user_thresh
= div_factor_fine(cache
->key
.offset
,
3091 if (chunk_used
< user_thresh
)
3094 btrfs_put_block_group(cache
);
3098 static int chunk_devid_filter(struct extent_buffer
*leaf
,
3099 struct btrfs_chunk
*chunk
,
3100 struct btrfs_balance_args
*bargs
)
3102 struct btrfs_stripe
*stripe
;
3103 int num_stripes
= btrfs_chunk_num_stripes(leaf
, chunk
);
3106 for (i
= 0; i
< num_stripes
; i
++) {
3107 stripe
= btrfs_stripe_nr(chunk
, i
);
3108 if (btrfs_stripe_devid(leaf
, stripe
) == bargs
->devid
)
3115 /* [pstart, pend) */
3116 static int chunk_drange_filter(struct extent_buffer
*leaf
,
3117 struct btrfs_chunk
*chunk
,
3119 struct btrfs_balance_args
*bargs
)
3121 struct btrfs_stripe
*stripe
;
3122 int num_stripes
= btrfs_chunk_num_stripes(leaf
, chunk
);
3128 if (!(bargs
->flags
& BTRFS_BALANCE_ARGS_DEVID
))
3131 if (btrfs_chunk_type(leaf
, chunk
) & (BTRFS_BLOCK_GROUP_DUP
|
3132 BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID10
)) {
3133 factor
= num_stripes
/ 2;
3134 } else if (btrfs_chunk_type(leaf
, chunk
) & BTRFS_BLOCK_GROUP_RAID5
) {
3135 factor
= num_stripes
- 1;
3136 } else if (btrfs_chunk_type(leaf
, chunk
) & BTRFS_BLOCK_GROUP_RAID6
) {
3137 factor
= num_stripes
- 2;
3139 factor
= num_stripes
;
3142 for (i
= 0; i
< num_stripes
; i
++) {
3143 stripe
= btrfs_stripe_nr(chunk
, i
);
3144 if (btrfs_stripe_devid(leaf
, stripe
) != bargs
->devid
)
3147 stripe_offset
= btrfs_stripe_offset(leaf
, stripe
);
3148 stripe_length
= btrfs_chunk_length(leaf
, chunk
);
3149 stripe_length
= div_u64(stripe_length
, factor
);
3151 if (stripe_offset
< bargs
->pend
&&
3152 stripe_offset
+ stripe_length
> bargs
->pstart
)
3159 /* [vstart, vend) */
3160 static int chunk_vrange_filter(struct extent_buffer
*leaf
,
3161 struct btrfs_chunk
*chunk
,
3163 struct btrfs_balance_args
*bargs
)
3165 if (chunk_offset
< bargs
->vend
&&
3166 chunk_offset
+ btrfs_chunk_length(leaf
, chunk
) > bargs
->vstart
)
3167 /* at least part of the chunk is inside this vrange */
3173 static int chunk_soft_convert_filter(u64 chunk_type
,
3174 struct btrfs_balance_args
*bargs
)
3176 if (!(bargs
->flags
& BTRFS_BALANCE_ARGS_CONVERT
))
3179 chunk_type
= chunk_to_extended(chunk_type
) &
3180 BTRFS_EXTENDED_PROFILE_MASK
;
3182 if (bargs
->target
== chunk_type
)
3188 static int should_balance_chunk(struct btrfs_root
*root
,
3189 struct extent_buffer
*leaf
,
3190 struct btrfs_chunk
*chunk
, u64 chunk_offset
)
3192 struct btrfs_balance_control
*bctl
= root
->fs_info
->balance_ctl
;
3193 struct btrfs_balance_args
*bargs
= NULL
;
3194 u64 chunk_type
= btrfs_chunk_type(leaf
, chunk
);
3197 if (!((chunk_type
& BTRFS_BLOCK_GROUP_TYPE_MASK
) &
3198 (bctl
->flags
& BTRFS_BALANCE_TYPE_MASK
))) {
3202 if (chunk_type
& BTRFS_BLOCK_GROUP_DATA
)
3203 bargs
= &bctl
->data
;
3204 else if (chunk_type
& BTRFS_BLOCK_GROUP_SYSTEM
)
3206 else if (chunk_type
& BTRFS_BLOCK_GROUP_METADATA
)
3207 bargs
= &bctl
->meta
;
3209 /* profiles filter */
3210 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_PROFILES
) &&
3211 chunk_profiles_filter(chunk_type
, bargs
)) {
3216 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_USAGE
) &&
3217 chunk_usage_filter(bctl
->fs_info
, chunk_offset
, bargs
)) {
3222 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_DEVID
) &&
3223 chunk_devid_filter(leaf
, chunk
, bargs
)) {
3227 /* drange filter, makes sense only with devid filter */
3228 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_DRANGE
) &&
3229 chunk_drange_filter(leaf
, chunk
, chunk_offset
, bargs
)) {
3234 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_VRANGE
) &&
3235 chunk_vrange_filter(leaf
, chunk
, chunk_offset
, bargs
)) {
3239 /* soft profile changing mode */
3240 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_SOFT
) &&
3241 chunk_soft_convert_filter(chunk_type
, bargs
)) {
3246 * limited by count, must be the last filter
3248 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_LIMIT
)) {
3249 if (bargs
->limit
== 0)
3258 static int __btrfs_balance(struct btrfs_fs_info
*fs_info
)
3260 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
3261 struct btrfs_root
*chunk_root
= fs_info
->chunk_root
;
3262 struct btrfs_root
*dev_root
= fs_info
->dev_root
;
3263 struct list_head
*devices
;
3264 struct btrfs_device
*device
;
3267 struct btrfs_chunk
*chunk
;
3268 struct btrfs_path
*path
;
3269 struct btrfs_key key
;
3270 struct btrfs_key found_key
;
3271 struct btrfs_trans_handle
*trans
;
3272 struct extent_buffer
*leaf
;
3275 int enospc_errors
= 0;
3276 bool counting
= true;
3277 u64 limit_data
= bctl
->data
.limit
;
3278 u64 limit_meta
= bctl
->meta
.limit
;
3279 u64 limit_sys
= bctl
->sys
.limit
;
3281 /* step one make some room on all the devices */
3282 devices
= &fs_info
->fs_devices
->devices
;
3283 list_for_each_entry(device
, devices
, dev_list
) {
3284 old_size
= btrfs_device_get_total_bytes(device
);
3285 size_to_free
= div_factor(old_size
, 1);
3286 size_to_free
= min(size_to_free
, (u64
)1 * 1024 * 1024);
3287 if (!device
->writeable
||
3288 btrfs_device_get_total_bytes(device
) -
3289 btrfs_device_get_bytes_used(device
) > size_to_free
||
3290 device
->is_tgtdev_for_dev_replace
)
3293 ret
= btrfs_shrink_device(device
, old_size
- size_to_free
);
3298 trans
= btrfs_start_transaction(dev_root
, 0);
3299 BUG_ON(IS_ERR(trans
));
3301 ret
= btrfs_grow_device(trans
, device
, old_size
);
3304 btrfs_end_transaction(trans
, dev_root
);
3307 /* step two, relocate all the chunks */
3308 path
= btrfs_alloc_path();
3314 /* zero out stat counters */
3315 spin_lock(&fs_info
->balance_lock
);
3316 memset(&bctl
->stat
, 0, sizeof(bctl
->stat
));
3317 spin_unlock(&fs_info
->balance_lock
);
3320 bctl
->data
.limit
= limit_data
;
3321 bctl
->meta
.limit
= limit_meta
;
3322 bctl
->sys
.limit
= limit_sys
;
3324 key
.objectid
= BTRFS_FIRST_CHUNK_TREE_OBJECTID
;
3325 key
.offset
= (u64
)-1;
3326 key
.type
= BTRFS_CHUNK_ITEM_KEY
;
3329 if ((!counting
&& atomic_read(&fs_info
->balance_pause_req
)) ||
3330 atomic_read(&fs_info
->balance_cancel_req
)) {
3335 mutex_lock(&fs_info
->delete_unused_bgs_mutex
);
3336 ret
= btrfs_search_slot(NULL
, chunk_root
, &key
, path
, 0, 0);
3338 mutex_unlock(&fs_info
->delete_unused_bgs_mutex
);
3343 * this shouldn't happen, it means the last relocate
3347 BUG(); /* FIXME break ? */
3349 ret
= btrfs_previous_item(chunk_root
, path
, 0,
3350 BTRFS_CHUNK_ITEM_KEY
);
3352 mutex_unlock(&fs_info
->delete_unused_bgs_mutex
);
3357 leaf
= path
->nodes
[0];
3358 slot
= path
->slots
[0];
3359 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
3361 if (found_key
.objectid
!= key
.objectid
) {
3362 mutex_unlock(&fs_info
->delete_unused_bgs_mutex
);
3366 chunk
= btrfs_item_ptr(leaf
, slot
, struct btrfs_chunk
);
3369 spin_lock(&fs_info
->balance_lock
);
3370 bctl
->stat
.considered
++;
3371 spin_unlock(&fs_info
->balance_lock
);
3374 ret
= should_balance_chunk(chunk_root
, leaf
, chunk
,
3376 btrfs_release_path(path
);
3378 mutex_unlock(&fs_info
->delete_unused_bgs_mutex
);
3383 mutex_unlock(&fs_info
->delete_unused_bgs_mutex
);
3384 spin_lock(&fs_info
->balance_lock
);
3385 bctl
->stat
.expected
++;
3386 spin_unlock(&fs_info
->balance_lock
);
3390 ret
= btrfs_relocate_chunk(chunk_root
,
3392 mutex_unlock(&fs_info
->delete_unused_bgs_mutex
);
3393 if (ret
&& ret
!= -ENOSPC
)
3395 if (ret
== -ENOSPC
) {
3398 spin_lock(&fs_info
->balance_lock
);
3399 bctl
->stat
.completed
++;
3400 spin_unlock(&fs_info
->balance_lock
);
3403 if (found_key
.offset
== 0)
3405 key
.offset
= found_key
.offset
- 1;
3409 btrfs_release_path(path
);
3414 btrfs_free_path(path
);
3415 if (enospc_errors
) {
3416 btrfs_info(fs_info
, "%d enospc errors during balance",
3426 * alloc_profile_is_valid - see if a given profile is valid and reduced
3427 * @flags: profile to validate
3428 * @extended: if true @flags is treated as an extended profile
3430 static int alloc_profile_is_valid(u64 flags
, int extended
)
3432 u64 mask
= (extended
? BTRFS_EXTENDED_PROFILE_MASK
:
3433 BTRFS_BLOCK_GROUP_PROFILE_MASK
);
3435 flags
&= ~BTRFS_BLOCK_GROUP_TYPE_MASK
;
3437 /* 1) check that all other bits are zeroed */
3441 /* 2) see if profile is reduced */
3443 return !extended
; /* "0" is valid for usual profiles */
3445 /* true if exactly one bit set */
3446 return (flags
& (flags
- 1)) == 0;
3449 static inline int balance_need_close(struct btrfs_fs_info
*fs_info
)
3451 /* cancel requested || normal exit path */
3452 return atomic_read(&fs_info
->balance_cancel_req
) ||
3453 (atomic_read(&fs_info
->balance_pause_req
) == 0 &&
3454 atomic_read(&fs_info
->balance_cancel_req
) == 0);
3457 static void __cancel_balance(struct btrfs_fs_info
*fs_info
)
3461 unset_balance_control(fs_info
);
3462 ret
= del_balance_item(fs_info
->tree_root
);
3464 btrfs_std_error(fs_info
, ret
);
3466 atomic_set(&fs_info
->mutually_exclusive_operation_running
, 0);
3470 * Should be called with both balance and volume mutexes held
3472 int btrfs_balance(struct btrfs_balance_control
*bctl
,
3473 struct btrfs_ioctl_balance_args
*bargs
)
3475 struct btrfs_fs_info
*fs_info
= bctl
->fs_info
;
3482 if (btrfs_fs_closing(fs_info
) ||
3483 atomic_read(&fs_info
->balance_pause_req
) ||
3484 atomic_read(&fs_info
->balance_cancel_req
)) {
3489 allowed
= btrfs_super_incompat_flags(fs_info
->super_copy
);
3490 if (allowed
& BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS
)
3494 * In case of mixed groups both data and meta should be picked,
3495 * and identical options should be given for both of them.
3497 allowed
= BTRFS_BALANCE_DATA
| BTRFS_BALANCE_METADATA
;
3498 if (mixed
&& (bctl
->flags
& allowed
)) {
3499 if (!(bctl
->flags
& BTRFS_BALANCE_DATA
) ||
3500 !(bctl
->flags
& BTRFS_BALANCE_METADATA
) ||
3501 memcmp(&bctl
->data
, &bctl
->meta
, sizeof(bctl
->data
))) {
3502 btrfs_err(fs_info
, "with mixed groups data and "
3503 "metadata balance options must be the same");
3509 num_devices
= fs_info
->fs_devices
->num_devices
;
3510 btrfs_dev_replace_lock(&fs_info
->dev_replace
);
3511 if (btrfs_dev_replace_is_ongoing(&fs_info
->dev_replace
)) {
3512 BUG_ON(num_devices
< 1);
3515 btrfs_dev_replace_unlock(&fs_info
->dev_replace
);
3516 allowed
= BTRFS_AVAIL_ALLOC_BIT_SINGLE
;
3517 if (num_devices
== 1)
3518 allowed
|= BTRFS_BLOCK_GROUP_DUP
;
3519 else if (num_devices
> 1)
3520 allowed
|= (BTRFS_BLOCK_GROUP_RAID0
| BTRFS_BLOCK_GROUP_RAID1
);
3521 if (num_devices
> 2)
3522 allowed
|= BTRFS_BLOCK_GROUP_RAID5
;
3523 if (num_devices
> 3)
3524 allowed
|= (BTRFS_BLOCK_GROUP_RAID10
|
3525 BTRFS_BLOCK_GROUP_RAID6
);
3526 if ((bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) &&
3527 (!alloc_profile_is_valid(bctl
->data
.target
, 1) ||
3528 (bctl
->data
.target
& ~allowed
))) {
3529 btrfs_err(fs_info
, "unable to start balance with target "
3530 "data profile %llu",
3535 if ((bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) &&
3536 (!alloc_profile_is_valid(bctl
->meta
.target
, 1) ||
3537 (bctl
->meta
.target
& ~allowed
))) {
3539 "unable to start balance with target metadata profile %llu",
3544 if ((bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) &&
3545 (!alloc_profile_is_valid(bctl
->sys
.target
, 1) ||
3546 (bctl
->sys
.target
& ~allowed
))) {
3548 "unable to start balance with target system profile %llu",
3554 /* allow dup'ed data chunks only in mixed mode */
3555 if (!mixed
&& (bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) &&
3556 (bctl
->data
.target
& BTRFS_BLOCK_GROUP_DUP
)) {
3557 btrfs_err(fs_info
, "dup for data is not allowed");
3562 /* allow to reduce meta or sys integrity only if force set */
3563 allowed
= BTRFS_BLOCK_GROUP_DUP
| BTRFS_BLOCK_GROUP_RAID1
|
3564 BTRFS_BLOCK_GROUP_RAID10
|
3565 BTRFS_BLOCK_GROUP_RAID5
|
3566 BTRFS_BLOCK_GROUP_RAID6
;
3568 seq
= read_seqbegin(&fs_info
->profiles_lock
);
3570 if (((bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) &&
3571 (fs_info
->avail_system_alloc_bits
& allowed
) &&
3572 !(bctl
->sys
.target
& allowed
)) ||
3573 ((bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) &&
3574 (fs_info
->avail_metadata_alloc_bits
& allowed
) &&
3575 !(bctl
->meta
.target
& allowed
))) {
3576 if (bctl
->flags
& BTRFS_BALANCE_FORCE
) {
3577 btrfs_info(fs_info
, "force reducing metadata integrity");
3579 btrfs_err(fs_info
, "balance will reduce metadata "
3580 "integrity, use force if you want this");
3585 } while (read_seqretry(&fs_info
->profiles_lock
, seq
));
3587 if (bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3588 fs_info
->num_tolerated_disk_barrier_failures
= min(
3589 btrfs_calc_num_tolerated_disk_barrier_failures(fs_info
),
3590 btrfs_get_num_tolerated_disk_barrier_failures(
3594 ret
= insert_balance_item(fs_info
->tree_root
, bctl
);
3595 if (ret
&& ret
!= -EEXIST
)
3598 if (!(bctl
->flags
& BTRFS_BALANCE_RESUME
)) {
3599 BUG_ON(ret
== -EEXIST
);
3600 set_balance_control(bctl
);
3602 BUG_ON(ret
!= -EEXIST
);
3603 spin_lock(&fs_info
->balance_lock
);
3604 update_balance_args(bctl
);
3605 spin_unlock(&fs_info
->balance_lock
);
3608 atomic_inc(&fs_info
->balance_running
);
3609 mutex_unlock(&fs_info
->balance_mutex
);
3611 ret
= __btrfs_balance(fs_info
);
3613 mutex_lock(&fs_info
->balance_mutex
);
3614 atomic_dec(&fs_info
->balance_running
);
3616 if (bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3617 fs_info
->num_tolerated_disk_barrier_failures
=
3618 btrfs_calc_num_tolerated_disk_barrier_failures(fs_info
);
3622 memset(bargs
, 0, sizeof(*bargs
));
3623 update_ioctl_balance_args(fs_info
, 0, bargs
);
3626 if ((ret
&& ret
!= -ECANCELED
&& ret
!= -ENOSPC
) ||
3627 balance_need_close(fs_info
)) {
3628 __cancel_balance(fs_info
);
3631 wake_up(&fs_info
->balance_wait_q
);
3635 if (bctl
->flags
& BTRFS_BALANCE_RESUME
)
3636 __cancel_balance(fs_info
);
3639 atomic_set(&fs_info
->mutually_exclusive_operation_running
, 0);
3644 static int balance_kthread(void *data
)
3646 struct btrfs_fs_info
*fs_info
= data
;
3649 mutex_lock(&fs_info
->volume_mutex
);
3650 mutex_lock(&fs_info
->balance_mutex
);
3652 if (fs_info
->balance_ctl
) {
3653 btrfs_info(fs_info
, "continuing balance");
3654 ret
= btrfs_balance(fs_info
->balance_ctl
, NULL
);
3657 mutex_unlock(&fs_info
->balance_mutex
);
3658 mutex_unlock(&fs_info
->volume_mutex
);
3663 int btrfs_resume_balance_async(struct btrfs_fs_info
*fs_info
)
3665 struct task_struct
*tsk
;
3667 spin_lock(&fs_info
->balance_lock
);
3668 if (!fs_info
->balance_ctl
) {
3669 spin_unlock(&fs_info
->balance_lock
);
3672 spin_unlock(&fs_info
->balance_lock
);
3674 if (btrfs_test_opt(fs_info
->tree_root
, SKIP_BALANCE
)) {
3675 btrfs_info(fs_info
, "force skipping balance");
3679 tsk
= kthread_run(balance_kthread
, fs_info
, "btrfs-balance");
3680 return PTR_ERR_OR_ZERO(tsk
);
3683 int btrfs_recover_balance(struct btrfs_fs_info
*fs_info
)
3685 struct btrfs_balance_control
*bctl
;
3686 struct btrfs_balance_item
*item
;
3687 struct btrfs_disk_balance_args disk_bargs
;
3688 struct btrfs_path
*path
;
3689 struct extent_buffer
*leaf
;
3690 struct btrfs_key key
;
3693 path
= btrfs_alloc_path();
3697 key
.objectid
= BTRFS_BALANCE_OBJECTID
;
3698 key
.type
= BTRFS_BALANCE_ITEM_KEY
;
3701 ret
= btrfs_search_slot(NULL
, fs_info
->tree_root
, &key
, path
, 0, 0);
3704 if (ret
> 0) { /* ret = -ENOENT; */
3709 bctl
= kzalloc(sizeof(*bctl
), GFP_NOFS
);
3715 leaf
= path
->nodes
[0];
3716 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_balance_item
);
3718 bctl
->fs_info
= fs_info
;
3719 bctl
->flags
= btrfs_balance_flags(leaf
, item
);
3720 bctl
->flags
|= BTRFS_BALANCE_RESUME
;
3722 btrfs_balance_data(leaf
, item
, &disk_bargs
);
3723 btrfs_disk_balance_args_to_cpu(&bctl
->data
, &disk_bargs
);
3724 btrfs_balance_meta(leaf
, item
, &disk_bargs
);
3725 btrfs_disk_balance_args_to_cpu(&bctl
->meta
, &disk_bargs
);
3726 btrfs_balance_sys(leaf
, item
, &disk_bargs
);
3727 btrfs_disk_balance_args_to_cpu(&bctl
->sys
, &disk_bargs
);
3729 WARN_ON(atomic_xchg(&fs_info
->mutually_exclusive_operation_running
, 1));
3731 mutex_lock(&fs_info
->volume_mutex
);
3732 mutex_lock(&fs_info
->balance_mutex
);
3734 set_balance_control(bctl
);
3736 mutex_unlock(&fs_info
->balance_mutex
);
3737 mutex_unlock(&fs_info
->volume_mutex
);
3739 btrfs_free_path(path
);
3743 int btrfs_pause_balance(struct btrfs_fs_info
*fs_info
)
3747 mutex_lock(&fs_info
->balance_mutex
);
3748 if (!fs_info
->balance_ctl
) {
3749 mutex_unlock(&fs_info
->balance_mutex
);
3753 if (atomic_read(&fs_info
->balance_running
)) {
3754 atomic_inc(&fs_info
->balance_pause_req
);
3755 mutex_unlock(&fs_info
->balance_mutex
);
3757 wait_event(fs_info
->balance_wait_q
,
3758 atomic_read(&fs_info
->balance_running
) == 0);
3760 mutex_lock(&fs_info
->balance_mutex
);
3761 /* we are good with balance_ctl ripped off from under us */
3762 BUG_ON(atomic_read(&fs_info
->balance_running
));
3763 atomic_dec(&fs_info
->balance_pause_req
);
3768 mutex_unlock(&fs_info
->balance_mutex
);
3772 int btrfs_cancel_balance(struct btrfs_fs_info
*fs_info
)
3774 if (fs_info
->sb
->s_flags
& MS_RDONLY
)
3777 mutex_lock(&fs_info
->balance_mutex
);
3778 if (!fs_info
->balance_ctl
) {
3779 mutex_unlock(&fs_info
->balance_mutex
);
3783 atomic_inc(&fs_info
->balance_cancel_req
);
3785 * if we are running just wait and return, balance item is
3786 * deleted in btrfs_balance in this case
3788 if (atomic_read(&fs_info
->balance_running
)) {
3789 mutex_unlock(&fs_info
->balance_mutex
);
3790 wait_event(fs_info
->balance_wait_q
,
3791 atomic_read(&fs_info
->balance_running
) == 0);
3792 mutex_lock(&fs_info
->balance_mutex
);
3794 /* __cancel_balance needs volume_mutex */
3795 mutex_unlock(&fs_info
->balance_mutex
);
3796 mutex_lock(&fs_info
->volume_mutex
);
3797 mutex_lock(&fs_info
->balance_mutex
);
3799 if (fs_info
->balance_ctl
)
3800 __cancel_balance(fs_info
);
3802 mutex_unlock(&fs_info
->volume_mutex
);
3805 BUG_ON(fs_info
->balance_ctl
|| atomic_read(&fs_info
->balance_running
));
3806 atomic_dec(&fs_info
->balance_cancel_req
);
3807 mutex_unlock(&fs_info
->balance_mutex
);
3811 static int btrfs_uuid_scan_kthread(void *data
)
3813 struct btrfs_fs_info
*fs_info
= data
;
3814 struct btrfs_root
*root
= fs_info
->tree_root
;
3815 struct btrfs_key key
;
3816 struct btrfs_key max_key
;
3817 struct btrfs_path
*path
= NULL
;
3819 struct extent_buffer
*eb
;
3821 struct btrfs_root_item root_item
;
3823 struct btrfs_trans_handle
*trans
= NULL
;
3825 path
= btrfs_alloc_path();
3832 key
.type
= BTRFS_ROOT_ITEM_KEY
;
3835 max_key
.objectid
= (u64
)-1;
3836 max_key
.type
= BTRFS_ROOT_ITEM_KEY
;
3837 max_key
.offset
= (u64
)-1;
3840 ret
= btrfs_search_forward(root
, &key
, path
, 0);
3847 if (key
.type
!= BTRFS_ROOT_ITEM_KEY
||
3848 (key
.objectid
< BTRFS_FIRST_FREE_OBJECTID
&&
3849 key
.objectid
!= BTRFS_FS_TREE_OBJECTID
) ||
3850 key
.objectid
> BTRFS_LAST_FREE_OBJECTID
)
3853 eb
= path
->nodes
[0];
3854 slot
= path
->slots
[0];
3855 item_size
= btrfs_item_size_nr(eb
, slot
);
3856 if (item_size
< sizeof(root_item
))
3859 read_extent_buffer(eb
, &root_item
,
3860 btrfs_item_ptr_offset(eb
, slot
),
3861 (int)sizeof(root_item
));
3862 if (btrfs_root_refs(&root_item
) == 0)
3865 if (!btrfs_is_empty_uuid(root_item
.uuid
) ||
3866 !btrfs_is_empty_uuid(root_item
.received_uuid
)) {
3870 btrfs_release_path(path
);
3872 * 1 - subvol uuid item
3873 * 1 - received_subvol uuid item
3875 trans
= btrfs_start_transaction(fs_info
->uuid_root
, 2);
3876 if (IS_ERR(trans
)) {
3877 ret
= PTR_ERR(trans
);
3885 if (!btrfs_is_empty_uuid(root_item
.uuid
)) {
3886 ret
= btrfs_uuid_tree_add(trans
, fs_info
->uuid_root
,
3888 BTRFS_UUID_KEY_SUBVOL
,
3891 btrfs_warn(fs_info
, "uuid_tree_add failed %d",
3897 if (!btrfs_is_empty_uuid(root_item
.received_uuid
)) {
3898 ret
= btrfs_uuid_tree_add(trans
, fs_info
->uuid_root
,
3899 root_item
.received_uuid
,
3900 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
3903 btrfs_warn(fs_info
, "uuid_tree_add failed %d",
3911 ret
= btrfs_end_transaction(trans
, fs_info
->uuid_root
);
3917 btrfs_release_path(path
);
3918 if (key
.offset
< (u64
)-1) {
3920 } else if (key
.type
< BTRFS_ROOT_ITEM_KEY
) {
3922 key
.type
= BTRFS_ROOT_ITEM_KEY
;
3923 } else if (key
.objectid
< (u64
)-1) {
3925 key
.type
= BTRFS_ROOT_ITEM_KEY
;
3934 btrfs_free_path(path
);
3935 if (trans
&& !IS_ERR(trans
))
3936 btrfs_end_transaction(trans
, fs_info
->uuid_root
);
3938 btrfs_warn(fs_info
, "btrfs_uuid_scan_kthread failed %d", ret
);
3940 fs_info
->update_uuid_tree_gen
= 1;
3941 up(&fs_info
->uuid_tree_rescan_sem
);
3946 * Callback for btrfs_uuid_tree_iterate().
3948 * 0 check succeeded, the entry is not outdated.
3949 * < 0 if an error occured.
3950 * > 0 if the check failed, which means the caller shall remove the entry.
3952 static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info
*fs_info
,
3953 u8
*uuid
, u8 type
, u64 subid
)
3955 struct btrfs_key key
;
3957 struct btrfs_root
*subvol_root
;
3959 if (type
!= BTRFS_UUID_KEY_SUBVOL
&&
3960 type
!= BTRFS_UUID_KEY_RECEIVED_SUBVOL
)
3963 key
.objectid
= subid
;
3964 key
.type
= BTRFS_ROOT_ITEM_KEY
;
3965 key
.offset
= (u64
)-1;
3966 subvol_root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
3967 if (IS_ERR(subvol_root
)) {
3968 ret
= PTR_ERR(subvol_root
);
3975 case BTRFS_UUID_KEY_SUBVOL
:
3976 if (memcmp(uuid
, subvol_root
->root_item
.uuid
, BTRFS_UUID_SIZE
))
3979 case BTRFS_UUID_KEY_RECEIVED_SUBVOL
:
3980 if (memcmp(uuid
, subvol_root
->root_item
.received_uuid
,
3990 static int btrfs_uuid_rescan_kthread(void *data
)
3992 struct btrfs_fs_info
*fs_info
= (struct btrfs_fs_info
*)data
;
3996 * 1st step is to iterate through the existing UUID tree and
3997 * to delete all entries that contain outdated data.
3998 * 2nd step is to add all missing entries to the UUID tree.
4000 ret
= btrfs_uuid_tree_iterate(fs_info
, btrfs_check_uuid_tree_entry
);
4002 btrfs_warn(fs_info
, "iterating uuid_tree failed %d", ret
);
4003 up(&fs_info
->uuid_tree_rescan_sem
);
4006 return btrfs_uuid_scan_kthread(data
);
4009 int btrfs_create_uuid_tree(struct btrfs_fs_info
*fs_info
)
4011 struct btrfs_trans_handle
*trans
;
4012 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
4013 struct btrfs_root
*uuid_root
;
4014 struct task_struct
*task
;
4021 trans
= btrfs_start_transaction(tree_root
, 2);
4023 return PTR_ERR(trans
);
4025 uuid_root
= btrfs_create_tree(trans
, fs_info
,
4026 BTRFS_UUID_TREE_OBJECTID
);
4027 if (IS_ERR(uuid_root
)) {
4028 ret
= PTR_ERR(uuid_root
);
4029 btrfs_abort_transaction(trans
, tree_root
, ret
);
4033 fs_info
->uuid_root
= uuid_root
;
4035 ret
= btrfs_commit_transaction(trans
, tree_root
);
4039 down(&fs_info
->uuid_tree_rescan_sem
);
4040 task
= kthread_run(btrfs_uuid_scan_kthread
, fs_info
, "btrfs-uuid");
4042 /* fs_info->update_uuid_tree_gen remains 0 in all error case */
4043 btrfs_warn(fs_info
, "failed to start uuid_scan task");
4044 up(&fs_info
->uuid_tree_rescan_sem
);
4045 return PTR_ERR(task
);
4051 int btrfs_check_uuid_tree(struct btrfs_fs_info
*fs_info
)
4053 struct task_struct
*task
;
4055 down(&fs_info
->uuid_tree_rescan_sem
);
4056 task
= kthread_run(btrfs_uuid_rescan_kthread
, fs_info
, "btrfs-uuid");
4058 /* fs_info->update_uuid_tree_gen remains 0 in all error case */
4059 btrfs_warn(fs_info
, "failed to start uuid_rescan task");
4060 up(&fs_info
->uuid_tree_rescan_sem
);
4061 return PTR_ERR(task
);
4068 * shrinking a device means finding all of the device extents past
4069 * the new size, and then following the back refs to the chunks.
4070 * The chunk relocation code actually frees the device extent
4072 int btrfs_shrink_device(struct btrfs_device
*device
, u64 new_size
)
4074 struct btrfs_trans_handle
*trans
;
4075 struct btrfs_root
*root
= device
->dev_root
;
4076 struct btrfs_dev_extent
*dev_extent
= NULL
;
4077 struct btrfs_path
*path
;
4083 bool retried
= false;
4084 bool checked_pending_chunks
= false;
4085 struct extent_buffer
*l
;
4086 struct btrfs_key key
;
4087 struct btrfs_super_block
*super_copy
= root
->fs_info
->super_copy
;
4088 u64 old_total
= btrfs_super_total_bytes(super_copy
);
4089 u64 old_size
= btrfs_device_get_total_bytes(device
);
4090 u64 diff
= old_size
- new_size
;
4092 if (device
->is_tgtdev_for_dev_replace
)
4095 path
= btrfs_alloc_path();
4103 btrfs_device_set_total_bytes(device
, new_size
);
4104 if (device
->writeable
) {
4105 device
->fs_devices
->total_rw_bytes
-= diff
;
4106 spin_lock(&root
->fs_info
->free_chunk_lock
);
4107 root
->fs_info
->free_chunk_space
-= diff
;
4108 spin_unlock(&root
->fs_info
->free_chunk_lock
);
4110 unlock_chunks(root
);
4113 key
.objectid
= device
->devid
;
4114 key
.offset
= (u64
)-1;
4115 key
.type
= BTRFS_DEV_EXTENT_KEY
;
4118 mutex_lock(&root
->fs_info
->delete_unused_bgs_mutex
);
4119 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
4121 mutex_unlock(&root
->fs_info
->delete_unused_bgs_mutex
);
4125 ret
= btrfs_previous_item(root
, path
, 0, key
.type
);
4127 mutex_unlock(&root
->fs_info
->delete_unused_bgs_mutex
);
4132 btrfs_release_path(path
);
4137 slot
= path
->slots
[0];
4138 btrfs_item_key_to_cpu(l
, &key
, path
->slots
[0]);
4140 if (key
.objectid
!= device
->devid
) {
4141 mutex_unlock(&root
->fs_info
->delete_unused_bgs_mutex
);
4142 btrfs_release_path(path
);
4146 dev_extent
= btrfs_item_ptr(l
, slot
, struct btrfs_dev_extent
);
4147 length
= btrfs_dev_extent_length(l
, dev_extent
);
4149 if (key
.offset
+ length
<= new_size
) {
4150 mutex_unlock(&root
->fs_info
->delete_unused_bgs_mutex
);
4151 btrfs_release_path(path
);
4155 chunk_offset
= btrfs_dev_extent_chunk_offset(l
, dev_extent
);
4156 btrfs_release_path(path
);
4158 ret
= btrfs_relocate_chunk(root
, chunk_offset
);
4159 mutex_unlock(&root
->fs_info
->delete_unused_bgs_mutex
);
4160 if (ret
&& ret
!= -ENOSPC
)
4164 } while (key
.offset
-- > 0);
4166 if (failed
&& !retried
) {
4170 } else if (failed
&& retried
) {
4175 /* Shrinking succeeded, else we would be at "done". */
4176 trans
= btrfs_start_transaction(root
, 0);
4177 if (IS_ERR(trans
)) {
4178 ret
= PTR_ERR(trans
);
4185 * We checked in the above loop all device extents that were already in
4186 * the device tree. However before we have updated the device's
4187 * total_bytes to the new size, we might have had chunk allocations that
4188 * have not complete yet (new block groups attached to transaction
4189 * handles), and therefore their device extents were not yet in the
4190 * device tree and we missed them in the loop above. So if we have any
4191 * pending chunk using a device extent that overlaps the device range
4192 * that we can not use anymore, commit the current transaction and
4193 * repeat the search on the device tree - this way we guarantee we will
4194 * not have chunks using device extents that end beyond 'new_size'.
4196 if (!checked_pending_chunks
) {
4197 u64 start
= new_size
;
4198 u64 len
= old_size
- new_size
;
4200 if (contains_pending_extent(trans
->transaction
, device
,
4202 unlock_chunks(root
);
4203 checked_pending_chunks
= true;
4206 ret
= btrfs_commit_transaction(trans
, root
);
4213 btrfs_device_set_disk_total_bytes(device
, new_size
);
4214 if (list_empty(&device
->resized_list
))
4215 list_add_tail(&device
->resized_list
,
4216 &root
->fs_info
->fs_devices
->resized_devices
);
4218 WARN_ON(diff
> old_total
);
4219 btrfs_set_super_total_bytes(super_copy
, old_total
- diff
);
4220 unlock_chunks(root
);
4222 /* Now btrfs_update_device() will change the on-disk size. */
4223 ret
= btrfs_update_device(trans
, device
);
4224 btrfs_end_transaction(trans
, root
);
4226 btrfs_free_path(path
);
4229 btrfs_device_set_total_bytes(device
, old_size
);
4230 if (device
->writeable
)
4231 device
->fs_devices
->total_rw_bytes
+= diff
;
4232 spin_lock(&root
->fs_info
->free_chunk_lock
);
4233 root
->fs_info
->free_chunk_space
+= diff
;
4234 spin_unlock(&root
->fs_info
->free_chunk_lock
);
4235 unlock_chunks(root
);
4240 static int btrfs_add_system_chunk(struct btrfs_root
*root
,
4241 struct btrfs_key
*key
,
4242 struct btrfs_chunk
*chunk
, int item_size
)
4244 struct btrfs_super_block
*super_copy
= root
->fs_info
->super_copy
;
4245 struct btrfs_disk_key disk_key
;
4250 array_size
= btrfs_super_sys_array_size(super_copy
);
4251 if (array_size
+ item_size
+ sizeof(disk_key
)
4252 > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE
) {
4253 unlock_chunks(root
);
4257 ptr
= super_copy
->sys_chunk_array
+ array_size
;
4258 btrfs_cpu_key_to_disk(&disk_key
, key
);
4259 memcpy(ptr
, &disk_key
, sizeof(disk_key
));
4260 ptr
+= sizeof(disk_key
);
4261 memcpy(ptr
, chunk
, item_size
);
4262 item_size
+= sizeof(disk_key
);
4263 btrfs_set_super_sys_array_size(super_copy
, array_size
+ item_size
);
4264 unlock_chunks(root
);
4270 * sort the devices in descending order by max_avail, total_avail
4272 static int btrfs_cmp_device_info(const void *a
, const void *b
)
4274 const struct btrfs_device_info
*di_a
= a
;
4275 const struct btrfs_device_info
*di_b
= b
;
4277 if (di_a
->max_avail
> di_b
->max_avail
)
4279 if (di_a
->max_avail
< di_b
->max_avail
)
4281 if (di_a
->total_avail
> di_b
->total_avail
)
4283 if (di_a
->total_avail
< di_b
->total_avail
)
4288 static const struct btrfs_raid_attr btrfs_raid_array
[BTRFS_NR_RAID_TYPES
] = {
4289 [BTRFS_RAID_RAID10
] = {
4292 .devs_max
= 0, /* 0 == as many as possible */
4294 .devs_increment
= 2,
4297 [BTRFS_RAID_RAID1
] = {
4302 .devs_increment
= 2,
4305 [BTRFS_RAID_DUP
] = {
4310 .devs_increment
= 1,
4313 [BTRFS_RAID_RAID0
] = {
4318 .devs_increment
= 1,
4321 [BTRFS_RAID_SINGLE
] = {
4326 .devs_increment
= 1,
4329 [BTRFS_RAID_RAID5
] = {
4334 .devs_increment
= 1,
4337 [BTRFS_RAID_RAID6
] = {
4342 .devs_increment
= 1,
4347 static u32
find_raid56_stripe_len(u32 data_devices
, u32 dev_stripe_target
)
4349 /* TODO allow them to set a preferred stripe size */
4353 static void check_raid56_incompat_flag(struct btrfs_fs_info
*info
, u64 type
)
4355 if (!(type
& BTRFS_BLOCK_GROUP_RAID56_MASK
))
4358 btrfs_set_fs_incompat(info
, RAID56
);
4361 #define BTRFS_MAX_DEVS(r) ((BTRFS_LEAF_DATA_SIZE(r) \
4362 - sizeof(struct btrfs_item) \
4363 - sizeof(struct btrfs_chunk)) \
4364 / sizeof(struct btrfs_stripe) + 1)
4366 #define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \
4367 - 2 * sizeof(struct btrfs_disk_key) \
4368 - 2 * sizeof(struct btrfs_chunk)) \
4369 / sizeof(struct btrfs_stripe) + 1)
4371 static int __btrfs_alloc_chunk(struct btrfs_trans_handle
*trans
,
4372 struct btrfs_root
*extent_root
, u64 start
,
4375 struct btrfs_fs_info
*info
= extent_root
->fs_info
;
4376 struct btrfs_fs_devices
*fs_devices
= info
->fs_devices
;
4377 struct list_head
*cur
;
4378 struct map_lookup
*map
= NULL
;
4379 struct extent_map_tree
*em_tree
;
4380 struct extent_map
*em
;
4381 struct btrfs_device_info
*devices_info
= NULL
;
4383 int num_stripes
; /* total number of stripes to allocate */
4384 int data_stripes
; /* number of stripes that count for
4386 int sub_stripes
; /* sub_stripes info for map */
4387 int dev_stripes
; /* stripes per dev */
4388 int devs_max
; /* max devs to use */
4389 int devs_min
; /* min devs needed */
4390 int devs_increment
; /* ndevs has to be a multiple of this */
4391 int ncopies
; /* how many copies to data has */
4393 u64 max_stripe_size
;
4397 u64 raid_stripe_len
= BTRFS_STRIPE_LEN
;
4403 BUG_ON(!alloc_profile_is_valid(type
, 0));
4405 if (list_empty(&fs_devices
->alloc_list
))
4408 index
= __get_raid_index(type
);
4410 sub_stripes
= btrfs_raid_array
[index
].sub_stripes
;
4411 dev_stripes
= btrfs_raid_array
[index
].dev_stripes
;
4412 devs_max
= btrfs_raid_array
[index
].devs_max
;
4413 devs_min
= btrfs_raid_array
[index
].devs_min
;
4414 devs_increment
= btrfs_raid_array
[index
].devs_increment
;
4415 ncopies
= btrfs_raid_array
[index
].ncopies
;
4417 if (type
& BTRFS_BLOCK_GROUP_DATA
) {
4418 max_stripe_size
= 1024 * 1024 * 1024;
4419 max_chunk_size
= 10 * max_stripe_size
;
4421 devs_max
= BTRFS_MAX_DEVS(info
->chunk_root
);
4422 } else if (type
& BTRFS_BLOCK_GROUP_METADATA
) {
4423 /* for larger filesystems, use larger metadata chunks */
4424 if (fs_devices
->total_rw_bytes
> 50ULL * 1024 * 1024 * 1024)
4425 max_stripe_size
= 1024 * 1024 * 1024;
4427 max_stripe_size
= 256 * 1024 * 1024;
4428 max_chunk_size
= max_stripe_size
;
4430 devs_max
= BTRFS_MAX_DEVS(info
->chunk_root
);
4431 } else if (type
& BTRFS_BLOCK_GROUP_SYSTEM
) {
4432 max_stripe_size
= 32 * 1024 * 1024;
4433 max_chunk_size
= 2 * max_stripe_size
;
4435 devs_max
= BTRFS_MAX_DEVS_SYS_CHUNK
;
4437 btrfs_err(info
, "invalid chunk type 0x%llx requested",
4442 /* we don't want a chunk larger than 10% of writeable space */
4443 max_chunk_size
= min(div_factor(fs_devices
->total_rw_bytes
, 1),
4446 devices_info
= kcalloc(fs_devices
->rw_devices
, sizeof(*devices_info
),
4451 cur
= fs_devices
->alloc_list
.next
;
4454 * in the first pass through the devices list, we gather information
4455 * about the available holes on each device.
4458 while (cur
!= &fs_devices
->alloc_list
) {
4459 struct btrfs_device
*device
;
4463 device
= list_entry(cur
, struct btrfs_device
, dev_alloc_list
);
4467 if (!device
->writeable
) {
4469 "BTRFS: read-only device in alloc_list\n");
4473 if (!device
->in_fs_metadata
||
4474 device
->is_tgtdev_for_dev_replace
)
4477 if (device
->total_bytes
> device
->bytes_used
)
4478 total_avail
= device
->total_bytes
- device
->bytes_used
;
4482 /* If there is no space on this device, skip it. */
4483 if (total_avail
== 0)
4486 ret
= find_free_dev_extent(trans
, device
,
4487 max_stripe_size
* dev_stripes
,
4488 &dev_offset
, &max_avail
);
4489 if (ret
&& ret
!= -ENOSPC
)
4493 max_avail
= max_stripe_size
* dev_stripes
;
4495 if (max_avail
< BTRFS_STRIPE_LEN
* dev_stripes
)
4498 if (ndevs
== fs_devices
->rw_devices
) {
4499 WARN(1, "%s: found more than %llu devices\n",
4500 __func__
, fs_devices
->rw_devices
);
4503 devices_info
[ndevs
].dev_offset
= dev_offset
;
4504 devices_info
[ndevs
].max_avail
= max_avail
;
4505 devices_info
[ndevs
].total_avail
= total_avail
;
4506 devices_info
[ndevs
].dev
= device
;
4511 * now sort the devices by hole size / available space
4513 sort(devices_info
, ndevs
, sizeof(struct btrfs_device_info
),
4514 btrfs_cmp_device_info
, NULL
);
4516 /* round down to number of usable stripes */
4517 ndevs
-= ndevs
% devs_increment
;
4519 if (ndevs
< devs_increment
* sub_stripes
|| ndevs
< devs_min
) {
4524 if (devs_max
&& ndevs
> devs_max
)
4527 * the primary goal is to maximize the number of stripes, so use as many
4528 * devices as possible, even if the stripes are not maximum sized.
4530 stripe_size
= devices_info
[ndevs
-1].max_avail
;
4531 num_stripes
= ndevs
* dev_stripes
;
4534 * this will have to be fixed for RAID1 and RAID10 over
4537 data_stripes
= num_stripes
/ ncopies
;
4539 if (type
& BTRFS_BLOCK_GROUP_RAID5
) {
4540 raid_stripe_len
= find_raid56_stripe_len(ndevs
- 1,
4541 btrfs_super_stripesize(info
->super_copy
));
4542 data_stripes
= num_stripes
- 1;
4544 if (type
& BTRFS_BLOCK_GROUP_RAID6
) {
4545 raid_stripe_len
= find_raid56_stripe_len(ndevs
- 2,
4546 btrfs_super_stripesize(info
->super_copy
));
4547 data_stripes
= num_stripes
- 2;
4551 * Use the number of data stripes to figure out how big this chunk
4552 * is really going to be in terms of logical address space,
4553 * and compare that answer with the max chunk size
4555 if (stripe_size
* data_stripes
> max_chunk_size
) {
4556 u64 mask
= (1ULL << 24) - 1;
4558 stripe_size
= div_u64(max_chunk_size
, data_stripes
);
4560 /* bump the answer up to a 16MB boundary */
4561 stripe_size
= (stripe_size
+ mask
) & ~mask
;
4563 /* but don't go higher than the limits we found
4564 * while searching for free extents
4566 if (stripe_size
> devices_info
[ndevs
-1].max_avail
)
4567 stripe_size
= devices_info
[ndevs
-1].max_avail
;
4570 stripe_size
= div_u64(stripe_size
, dev_stripes
);
4572 /* align to BTRFS_STRIPE_LEN */
4573 stripe_size
= div_u64(stripe_size
, raid_stripe_len
);
4574 stripe_size
*= raid_stripe_len
;
4576 map
= kmalloc(map_lookup_size(num_stripes
), GFP_NOFS
);
4581 map
->num_stripes
= num_stripes
;
4583 for (i
= 0; i
< ndevs
; ++i
) {
4584 for (j
= 0; j
< dev_stripes
; ++j
) {
4585 int s
= i
* dev_stripes
+ j
;
4586 map
->stripes
[s
].dev
= devices_info
[i
].dev
;
4587 map
->stripes
[s
].physical
= devices_info
[i
].dev_offset
+
4591 map
->sector_size
= extent_root
->sectorsize
;
4592 map
->stripe_len
= raid_stripe_len
;
4593 map
->io_align
= raid_stripe_len
;
4594 map
->io_width
= raid_stripe_len
;
4596 map
->sub_stripes
= sub_stripes
;
4598 num_bytes
= stripe_size
* data_stripes
;
4600 trace_btrfs_chunk_alloc(info
->chunk_root
, map
, start
, num_bytes
);
4602 em
= alloc_extent_map();
4608 set_bit(EXTENT_FLAG_FS_MAPPING
, &em
->flags
);
4609 em
->bdev
= (struct block_device
*)map
;
4611 em
->len
= num_bytes
;
4612 em
->block_start
= 0;
4613 em
->block_len
= em
->len
;
4614 em
->orig_block_len
= stripe_size
;
4616 em_tree
= &extent_root
->fs_info
->mapping_tree
.map_tree
;
4617 write_lock(&em_tree
->lock
);
4618 ret
= add_extent_mapping(em_tree
, em
, 0);
4620 list_add_tail(&em
->list
, &trans
->transaction
->pending_chunks
);
4621 atomic_inc(&em
->refs
);
4623 write_unlock(&em_tree
->lock
);
4625 free_extent_map(em
);
4629 ret
= btrfs_make_block_group(trans
, extent_root
, 0, type
,
4630 BTRFS_FIRST_CHUNK_TREE_OBJECTID
,
4633 goto error_del_extent
;
4635 for (i
= 0; i
< map
->num_stripes
; i
++) {
4636 num_bytes
= map
->stripes
[i
].dev
->bytes_used
+ stripe_size
;
4637 btrfs_device_set_bytes_used(map
->stripes
[i
].dev
, num_bytes
);
4640 spin_lock(&extent_root
->fs_info
->free_chunk_lock
);
4641 extent_root
->fs_info
->free_chunk_space
-= (stripe_size
*
4643 spin_unlock(&extent_root
->fs_info
->free_chunk_lock
);
4645 free_extent_map(em
);
4646 check_raid56_incompat_flag(extent_root
->fs_info
, type
);
4648 kfree(devices_info
);
4652 write_lock(&em_tree
->lock
);
4653 remove_extent_mapping(em_tree
, em
);
4654 write_unlock(&em_tree
->lock
);
4656 /* One for our allocation */
4657 free_extent_map(em
);
4658 /* One for the tree reference */
4659 free_extent_map(em
);
4660 /* One for the pending_chunks list reference */
4661 free_extent_map(em
);
4663 kfree(devices_info
);
4667 int btrfs_finish_chunk_alloc(struct btrfs_trans_handle
*trans
,
4668 struct btrfs_root
*extent_root
,
4669 u64 chunk_offset
, u64 chunk_size
)
4671 struct btrfs_key key
;
4672 struct btrfs_root
*chunk_root
= extent_root
->fs_info
->chunk_root
;
4673 struct btrfs_device
*device
;
4674 struct btrfs_chunk
*chunk
;
4675 struct btrfs_stripe
*stripe
;
4676 struct extent_map_tree
*em_tree
;
4677 struct extent_map
*em
;
4678 struct map_lookup
*map
;
4685 em_tree
= &extent_root
->fs_info
->mapping_tree
.map_tree
;
4686 read_lock(&em_tree
->lock
);
4687 em
= lookup_extent_mapping(em_tree
, chunk_offset
, chunk_size
);
4688 read_unlock(&em_tree
->lock
);
4691 btrfs_crit(extent_root
->fs_info
, "unable to find logical "
4692 "%Lu len %Lu", chunk_offset
, chunk_size
);
4696 if (em
->start
!= chunk_offset
|| em
->len
!= chunk_size
) {
4697 btrfs_crit(extent_root
->fs_info
, "found a bad mapping, wanted"
4698 " %Lu-%Lu, found %Lu-%Lu", chunk_offset
,
4699 chunk_size
, em
->start
, em
->len
);
4700 free_extent_map(em
);
4704 map
= (struct map_lookup
*)em
->bdev
;
4705 item_size
= btrfs_chunk_item_size(map
->num_stripes
);
4706 stripe_size
= em
->orig_block_len
;
4708 chunk
= kzalloc(item_size
, GFP_NOFS
);
4714 for (i
= 0; i
< map
->num_stripes
; i
++) {
4715 device
= map
->stripes
[i
].dev
;
4716 dev_offset
= map
->stripes
[i
].physical
;
4718 ret
= btrfs_update_device(trans
, device
);
4721 ret
= btrfs_alloc_dev_extent(trans
, device
,
4722 chunk_root
->root_key
.objectid
,
4723 BTRFS_FIRST_CHUNK_TREE_OBJECTID
,
4724 chunk_offset
, dev_offset
,
4730 stripe
= &chunk
->stripe
;
4731 for (i
= 0; i
< map
->num_stripes
; i
++) {
4732 device
= map
->stripes
[i
].dev
;
4733 dev_offset
= map
->stripes
[i
].physical
;
4735 btrfs_set_stack_stripe_devid(stripe
, device
->devid
);
4736 btrfs_set_stack_stripe_offset(stripe
, dev_offset
);
4737 memcpy(stripe
->dev_uuid
, device
->uuid
, BTRFS_UUID_SIZE
);
4741 btrfs_set_stack_chunk_length(chunk
, chunk_size
);
4742 btrfs_set_stack_chunk_owner(chunk
, extent_root
->root_key
.objectid
);
4743 btrfs_set_stack_chunk_stripe_len(chunk
, map
->stripe_len
);
4744 btrfs_set_stack_chunk_type(chunk
, map
->type
);
4745 btrfs_set_stack_chunk_num_stripes(chunk
, map
->num_stripes
);
4746 btrfs_set_stack_chunk_io_align(chunk
, map
->stripe_len
);
4747 btrfs_set_stack_chunk_io_width(chunk
, map
->stripe_len
);
4748 btrfs_set_stack_chunk_sector_size(chunk
, extent_root
->sectorsize
);
4749 btrfs_set_stack_chunk_sub_stripes(chunk
, map
->sub_stripes
);
4751 key
.objectid
= BTRFS_FIRST_CHUNK_TREE_OBJECTID
;
4752 key
.type
= BTRFS_CHUNK_ITEM_KEY
;
4753 key
.offset
= chunk_offset
;
4755 ret
= btrfs_insert_item(trans
, chunk_root
, &key
, chunk
, item_size
);
4756 if (ret
== 0 && map
->type
& BTRFS_BLOCK_GROUP_SYSTEM
) {
4758 * TODO: Cleanup of inserted chunk root in case of
4761 ret
= btrfs_add_system_chunk(chunk_root
, &key
, chunk
,
4767 free_extent_map(em
);
4772 * Chunk allocation falls into two parts. The first part does works
4773 * that make the new allocated chunk useable, but not do any operation
4774 * that modifies the chunk tree. The second part does the works that
4775 * require modifying the chunk tree. This division is important for the
4776 * bootstrap process of adding storage to a seed btrfs.
4778 int btrfs_alloc_chunk(struct btrfs_trans_handle
*trans
,
4779 struct btrfs_root
*extent_root
, u64 type
)
4783 ASSERT(mutex_is_locked(&extent_root
->fs_info
->chunk_mutex
));
4784 chunk_offset
= find_next_chunk(extent_root
->fs_info
);
4785 return __btrfs_alloc_chunk(trans
, extent_root
, chunk_offset
, type
);
4788 static noinline
int init_first_rw_device(struct btrfs_trans_handle
*trans
,
4789 struct btrfs_root
*root
,
4790 struct btrfs_device
*device
)
4793 u64 sys_chunk_offset
;
4795 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4796 struct btrfs_root
*extent_root
= fs_info
->extent_root
;
4799 chunk_offset
= find_next_chunk(fs_info
);
4800 alloc_profile
= btrfs_get_alloc_profile(extent_root
, 0);
4801 ret
= __btrfs_alloc_chunk(trans
, extent_root
, chunk_offset
,
4806 sys_chunk_offset
= find_next_chunk(root
->fs_info
);
4807 alloc_profile
= btrfs_get_alloc_profile(fs_info
->chunk_root
, 0);
4808 ret
= __btrfs_alloc_chunk(trans
, extent_root
, sys_chunk_offset
,
4813 static inline int btrfs_chunk_max_errors(struct map_lookup
*map
)
4817 if (map
->type
& (BTRFS_BLOCK_GROUP_RAID1
|
4818 BTRFS_BLOCK_GROUP_RAID10
|
4819 BTRFS_BLOCK_GROUP_RAID5
|
4820 BTRFS_BLOCK_GROUP_DUP
)) {
4822 } else if (map
->type
& BTRFS_BLOCK_GROUP_RAID6
) {
4831 int btrfs_chunk_readonly(struct btrfs_root
*root
, u64 chunk_offset
)
4833 struct extent_map
*em
;
4834 struct map_lookup
*map
;
4835 struct btrfs_mapping_tree
*map_tree
= &root
->fs_info
->mapping_tree
;
4840 read_lock(&map_tree
->map_tree
.lock
);
4841 em
= lookup_extent_mapping(&map_tree
->map_tree
, chunk_offset
, 1);
4842 read_unlock(&map_tree
->map_tree
.lock
);
4846 map
= (struct map_lookup
*)em
->bdev
;
4847 for (i
= 0; i
< map
->num_stripes
; i
++) {
4848 if (map
->stripes
[i
].dev
->missing
) {
4853 if (!map
->stripes
[i
].dev
->writeable
) {
4860 * If the number of missing devices is larger than max errors,
4861 * we can not write the data into that chunk successfully, so
4864 if (miss_ndevs
> btrfs_chunk_max_errors(map
))
4867 free_extent_map(em
);
4871 void btrfs_mapping_init(struct btrfs_mapping_tree
*tree
)
4873 extent_map_tree_init(&tree
->map_tree
);
4876 void btrfs_mapping_tree_free(struct btrfs_mapping_tree
*tree
)
4878 struct extent_map
*em
;
4881 write_lock(&tree
->map_tree
.lock
);
4882 em
= lookup_extent_mapping(&tree
->map_tree
, 0, (u64
)-1);
4884 remove_extent_mapping(&tree
->map_tree
, em
);
4885 write_unlock(&tree
->map_tree
.lock
);
4889 free_extent_map(em
);
4890 /* once for the tree */
4891 free_extent_map(em
);
4895 int btrfs_num_copies(struct btrfs_fs_info
*fs_info
, u64 logical
, u64 len
)
4897 struct btrfs_mapping_tree
*map_tree
= &fs_info
->mapping_tree
;
4898 struct extent_map
*em
;
4899 struct map_lookup
*map
;
4900 struct extent_map_tree
*em_tree
= &map_tree
->map_tree
;
4903 read_lock(&em_tree
->lock
);
4904 em
= lookup_extent_mapping(em_tree
, logical
, len
);
4905 read_unlock(&em_tree
->lock
);
4908 * We could return errors for these cases, but that could get ugly and
4909 * we'd probably do the same thing which is just not do anything else
4910 * and exit, so return 1 so the callers don't try to use other copies.
4913 btrfs_crit(fs_info
, "No mapping for %Lu-%Lu", logical
,
4918 if (em
->start
> logical
|| em
->start
+ em
->len
< logical
) {
4919 btrfs_crit(fs_info
, "Invalid mapping for %Lu-%Lu, got "
4920 "%Lu-%Lu", logical
, logical
+len
, em
->start
,
4921 em
->start
+ em
->len
);
4922 free_extent_map(em
);
4926 map
= (struct map_lookup
*)em
->bdev
;
4927 if (map
->type
& (BTRFS_BLOCK_GROUP_DUP
| BTRFS_BLOCK_GROUP_RAID1
))
4928 ret
= map
->num_stripes
;
4929 else if (map
->type
& BTRFS_BLOCK_GROUP_RAID10
)
4930 ret
= map
->sub_stripes
;
4931 else if (map
->type
& BTRFS_BLOCK_GROUP_RAID5
)
4933 else if (map
->type
& BTRFS_BLOCK_GROUP_RAID6
)
4937 free_extent_map(em
);
4939 btrfs_dev_replace_lock(&fs_info
->dev_replace
);
4940 if (btrfs_dev_replace_is_ongoing(&fs_info
->dev_replace
))
4942 btrfs_dev_replace_unlock(&fs_info
->dev_replace
);
4947 unsigned long btrfs_full_stripe_len(struct btrfs_root
*root
,
4948 struct btrfs_mapping_tree
*map_tree
,
4951 struct extent_map
*em
;
4952 struct map_lookup
*map
;
4953 struct extent_map_tree
*em_tree
= &map_tree
->map_tree
;
4954 unsigned long len
= root
->sectorsize
;
4956 read_lock(&em_tree
->lock
);
4957 em
= lookup_extent_mapping(em_tree
, logical
, len
);
4958 read_unlock(&em_tree
->lock
);
4961 BUG_ON(em
->start
> logical
|| em
->start
+ em
->len
< logical
);
4962 map
= (struct map_lookup
*)em
->bdev
;
4963 if (map
->type
& BTRFS_BLOCK_GROUP_RAID56_MASK
)
4964 len
= map
->stripe_len
* nr_data_stripes(map
);
4965 free_extent_map(em
);
4969 int btrfs_is_parity_mirror(struct btrfs_mapping_tree
*map_tree
,
4970 u64 logical
, u64 len
, int mirror_num
)
4972 struct extent_map
*em
;
4973 struct map_lookup
*map
;
4974 struct extent_map_tree
*em_tree
= &map_tree
->map_tree
;
4977 read_lock(&em_tree
->lock
);
4978 em
= lookup_extent_mapping(em_tree
, logical
, len
);
4979 read_unlock(&em_tree
->lock
);
4982 BUG_ON(em
->start
> logical
|| em
->start
+ em
->len
< logical
);
4983 map
= (struct map_lookup
*)em
->bdev
;
4984 if (map
->type
& BTRFS_BLOCK_GROUP_RAID56_MASK
)
4986 free_extent_map(em
);
4990 static int find_live_mirror(struct btrfs_fs_info
*fs_info
,
4991 struct map_lookup
*map
, int first
, int num
,
4992 int optimal
, int dev_replace_is_ongoing
)
4996 struct btrfs_device
*srcdev
;
4998 if (dev_replace_is_ongoing
&&
4999 fs_info
->dev_replace
.cont_reading_from_srcdev_mode
==
5000 BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID
)
5001 srcdev
= fs_info
->dev_replace
.srcdev
;
5006 * try to avoid the drive that is the source drive for a
5007 * dev-replace procedure, only choose it if no other non-missing
5008 * mirror is available
5010 for (tolerance
= 0; tolerance
< 2; tolerance
++) {
5011 if (map
->stripes
[optimal
].dev
->bdev
&&
5012 (tolerance
|| map
->stripes
[optimal
].dev
!= srcdev
))
5014 for (i
= first
; i
< first
+ num
; i
++) {
5015 if (map
->stripes
[i
].dev
->bdev
&&
5016 (tolerance
|| map
->stripes
[i
].dev
!= srcdev
))
5021 /* we couldn't find one that doesn't fail. Just return something
5022 * and the io error handling code will clean up eventually
5027 static inline int parity_smaller(u64 a
, u64 b
)
5032 /* Bubble-sort the stripe set to put the parity/syndrome stripes last */
5033 static void sort_parity_stripes(struct btrfs_bio
*bbio
, int num_stripes
)
5035 struct btrfs_bio_stripe s
;
5042 for (i
= 0; i
< num_stripes
- 1; i
++) {
5043 if (parity_smaller(bbio
->raid_map
[i
],
5044 bbio
->raid_map
[i
+1])) {
5045 s
= bbio
->stripes
[i
];
5046 l
= bbio
->raid_map
[i
];
5047 bbio
->stripes
[i
] = bbio
->stripes
[i
+1];
5048 bbio
->raid_map
[i
] = bbio
->raid_map
[i
+1];
5049 bbio
->stripes
[i
+1] = s
;
5050 bbio
->raid_map
[i
+1] = l
;
5058 static struct btrfs_bio
*alloc_btrfs_bio(int total_stripes
, int real_stripes
)
5060 struct btrfs_bio
*bbio
= kzalloc(
5061 /* the size of the btrfs_bio */
5062 sizeof(struct btrfs_bio
) +
5063 /* plus the variable array for the stripes */
5064 sizeof(struct btrfs_bio_stripe
) * (total_stripes
) +
5065 /* plus the variable array for the tgt dev */
5066 sizeof(int) * (real_stripes
) +
5068 * plus the raid_map, which includes both the tgt dev
5071 sizeof(u64
) * (total_stripes
),
5072 GFP_NOFS
|__GFP_NOFAIL
);
5074 atomic_set(&bbio
->error
, 0);
5075 atomic_set(&bbio
->refs
, 1);
5080 void btrfs_get_bbio(struct btrfs_bio
*bbio
)
5082 WARN_ON(!atomic_read(&bbio
->refs
));
5083 atomic_inc(&bbio
->refs
);
5086 void btrfs_put_bbio(struct btrfs_bio
*bbio
)
5090 if (atomic_dec_and_test(&bbio
->refs
))
5094 static int __btrfs_map_block(struct btrfs_fs_info
*fs_info
, int rw
,
5095 u64 logical
, u64
*length
,
5096 struct btrfs_bio
**bbio_ret
,
5097 int mirror_num
, int need_raid_map
)
5099 struct extent_map
*em
;
5100 struct map_lookup
*map
;
5101 struct btrfs_mapping_tree
*map_tree
= &fs_info
->mapping_tree
;
5102 struct extent_map_tree
*em_tree
= &map_tree
->map_tree
;
5105 u64 stripe_end_offset
;
5115 int tgtdev_indexes
= 0;
5116 struct btrfs_bio
*bbio
= NULL
;
5117 struct btrfs_dev_replace
*dev_replace
= &fs_info
->dev_replace
;
5118 int dev_replace_is_ongoing
= 0;
5119 int num_alloc_stripes
;
5120 int patch_the_first_stripe_for_dev_replace
= 0;
5121 u64 physical_to_patch_in_first_stripe
= 0;
5122 u64 raid56_full_stripe_start
= (u64
)-1;
5124 read_lock(&em_tree
->lock
);
5125 em
= lookup_extent_mapping(em_tree
, logical
, *length
);
5126 read_unlock(&em_tree
->lock
);
5129 btrfs_crit(fs_info
, "unable to find logical %llu len %llu",
5134 if (em
->start
> logical
|| em
->start
+ em
->len
< logical
) {
5135 btrfs_crit(fs_info
, "found a bad mapping, wanted %Lu, "
5136 "found %Lu-%Lu", logical
, em
->start
,
5137 em
->start
+ em
->len
);
5138 free_extent_map(em
);
5142 map
= (struct map_lookup
*)em
->bdev
;
5143 offset
= logical
- em
->start
;
5145 stripe_len
= map
->stripe_len
;
5148 * stripe_nr counts the total number of stripes we have to stride
5149 * to get to this block
5151 stripe_nr
= div64_u64(stripe_nr
, stripe_len
);
5153 stripe_offset
= stripe_nr
* stripe_len
;
5154 BUG_ON(offset
< stripe_offset
);
5156 /* stripe_offset is the offset of this block in its stripe*/
5157 stripe_offset
= offset
- stripe_offset
;
5159 /* if we're here for raid56, we need to know the stripe aligned start */
5160 if (map
->type
& BTRFS_BLOCK_GROUP_RAID56_MASK
) {
5161 unsigned long full_stripe_len
= stripe_len
* nr_data_stripes(map
);
5162 raid56_full_stripe_start
= offset
;
5164 /* allow a write of a full stripe, but make sure we don't
5165 * allow straddling of stripes
5167 raid56_full_stripe_start
= div64_u64(raid56_full_stripe_start
,
5169 raid56_full_stripe_start
*= full_stripe_len
;
5172 if (rw
& REQ_DISCARD
) {
5173 /* we don't discard raid56 yet */
5174 if (map
->type
& BTRFS_BLOCK_GROUP_RAID56_MASK
) {
5178 *length
= min_t(u64
, em
->len
- offset
, *length
);
5179 } else if (map
->type
& BTRFS_BLOCK_GROUP_PROFILE_MASK
) {
5181 /* For writes to RAID[56], allow a full stripeset across all disks.
5182 For other RAID types and for RAID[56] reads, just allow a single
5183 stripe (on a single disk). */
5184 if ((map
->type
& BTRFS_BLOCK_GROUP_RAID56_MASK
) &&
5186 max_len
= stripe_len
* nr_data_stripes(map
) -
5187 (offset
- raid56_full_stripe_start
);
5189 /* we limit the length of each bio to what fits in a stripe */
5190 max_len
= stripe_len
- stripe_offset
;
5192 *length
= min_t(u64
, em
->len
- offset
, max_len
);
5194 *length
= em
->len
- offset
;
5197 /* This is for when we're called from btrfs_merge_bio_hook() and all
5198 it cares about is the length */
5202 btrfs_dev_replace_lock(dev_replace
);
5203 dev_replace_is_ongoing
= btrfs_dev_replace_is_ongoing(dev_replace
);
5204 if (!dev_replace_is_ongoing
)
5205 btrfs_dev_replace_unlock(dev_replace
);
5207 if (dev_replace_is_ongoing
&& mirror_num
== map
->num_stripes
+ 1 &&
5208 !(rw
& (REQ_WRITE
| REQ_DISCARD
| REQ_GET_READ_MIRRORS
)) &&
5209 dev_replace
->tgtdev
!= NULL
) {
5211 * in dev-replace case, for repair case (that's the only
5212 * case where the mirror is selected explicitly when
5213 * calling btrfs_map_block), blocks left of the left cursor
5214 * can also be read from the target drive.
5215 * For REQ_GET_READ_MIRRORS, the target drive is added as
5216 * the last one to the array of stripes. For READ, it also
5217 * needs to be supported using the same mirror number.
5218 * If the requested block is not left of the left cursor,
5219 * EIO is returned. This can happen because btrfs_num_copies()
5220 * returns one more in the dev-replace case.
5222 u64 tmp_length
= *length
;
5223 struct btrfs_bio
*tmp_bbio
= NULL
;
5224 int tmp_num_stripes
;
5225 u64 srcdev_devid
= dev_replace
->srcdev
->devid
;
5226 int index_srcdev
= 0;
5228 u64 physical_of_found
= 0;
5230 ret
= __btrfs_map_block(fs_info
, REQ_GET_READ_MIRRORS
,
5231 logical
, &tmp_length
, &tmp_bbio
, 0, 0);
5233 WARN_ON(tmp_bbio
!= NULL
);
5237 tmp_num_stripes
= tmp_bbio
->num_stripes
;
5238 if (mirror_num
> tmp_num_stripes
) {
5240 * REQ_GET_READ_MIRRORS does not contain this
5241 * mirror, that means that the requested area
5242 * is not left of the left cursor
5245 btrfs_put_bbio(tmp_bbio
);
5250 * process the rest of the function using the mirror_num
5251 * of the source drive. Therefore look it up first.
5252 * At the end, patch the device pointer to the one of the
5255 for (i
= 0; i
< tmp_num_stripes
; i
++) {
5256 if (tmp_bbio
->stripes
[i
].dev
->devid
== srcdev_devid
) {
5258 * In case of DUP, in order to keep it
5259 * simple, only add the mirror with the
5260 * lowest physical address
5263 physical_of_found
<=
5264 tmp_bbio
->stripes
[i
].physical
)
5269 tmp_bbio
->stripes
[i
].physical
;
5274 mirror_num
= index_srcdev
+ 1;
5275 patch_the_first_stripe_for_dev_replace
= 1;
5276 physical_to_patch_in_first_stripe
= physical_of_found
;
5280 btrfs_put_bbio(tmp_bbio
);
5284 btrfs_put_bbio(tmp_bbio
);
5285 } else if (mirror_num
> map
->num_stripes
) {
5291 stripe_nr_orig
= stripe_nr
;
5292 stripe_nr_end
= ALIGN(offset
+ *length
, map
->stripe_len
);
5293 stripe_nr_end
= div_u64(stripe_nr_end
, map
->stripe_len
);
5294 stripe_end_offset
= stripe_nr_end
* map
->stripe_len
-
5297 if (map
->type
& BTRFS_BLOCK_GROUP_RAID0
) {
5298 if (rw
& REQ_DISCARD
)
5299 num_stripes
= min_t(u64
, map
->num_stripes
,
5300 stripe_nr_end
- stripe_nr_orig
);
5301 stripe_nr
= div_u64_rem(stripe_nr
, map
->num_stripes
,
5303 if (!(rw
& (REQ_WRITE
| REQ_DISCARD
| REQ_GET_READ_MIRRORS
)))
5305 } else if (map
->type
& BTRFS_BLOCK_GROUP_RAID1
) {
5306 if (rw
& (REQ_WRITE
| REQ_DISCARD
| REQ_GET_READ_MIRRORS
))
5307 num_stripes
= map
->num_stripes
;
5308 else if (mirror_num
)
5309 stripe_index
= mirror_num
- 1;
5311 stripe_index
= find_live_mirror(fs_info
, map
, 0,
5313 current
->pid
% map
->num_stripes
,
5314 dev_replace_is_ongoing
);
5315 mirror_num
= stripe_index
+ 1;
5318 } else if (map
->type
& BTRFS_BLOCK_GROUP_DUP
) {
5319 if (rw
& (REQ_WRITE
| REQ_DISCARD
| REQ_GET_READ_MIRRORS
)) {
5320 num_stripes
= map
->num_stripes
;
5321 } else if (mirror_num
) {
5322 stripe_index
= mirror_num
- 1;
5327 } else if (map
->type
& BTRFS_BLOCK_GROUP_RAID10
) {
5328 u32 factor
= map
->num_stripes
/ map
->sub_stripes
;
5330 stripe_nr
= div_u64_rem(stripe_nr
, factor
, &stripe_index
);
5331 stripe_index
*= map
->sub_stripes
;
5333 if (rw
& (REQ_WRITE
| REQ_GET_READ_MIRRORS
))
5334 num_stripes
= map
->sub_stripes
;
5335 else if (rw
& REQ_DISCARD
)
5336 num_stripes
= min_t(u64
, map
->sub_stripes
*
5337 (stripe_nr_end
- stripe_nr_orig
),
5339 else if (mirror_num
)
5340 stripe_index
+= mirror_num
- 1;
5342 int old_stripe_index
= stripe_index
;
5343 stripe_index
= find_live_mirror(fs_info
, map
,
5345 map
->sub_stripes
, stripe_index
+
5346 current
->pid
% map
->sub_stripes
,
5347 dev_replace_is_ongoing
);
5348 mirror_num
= stripe_index
- old_stripe_index
+ 1;
5351 } else if (map
->type
& BTRFS_BLOCK_GROUP_RAID56_MASK
) {
5352 if (need_raid_map
&&
5353 ((rw
& (REQ_WRITE
| REQ_GET_READ_MIRRORS
)) ||
5355 /* push stripe_nr back to the start of the full stripe */
5356 stripe_nr
= div_u64(raid56_full_stripe_start
,
5357 stripe_len
* nr_data_stripes(map
));
5359 /* RAID[56] write or recovery. Return all stripes */
5360 num_stripes
= map
->num_stripes
;
5361 max_errors
= nr_parity_stripes(map
);
5363 *length
= map
->stripe_len
;
5368 * Mirror #0 or #1 means the original data block.
5369 * Mirror #2 is RAID5 parity block.
5370 * Mirror #3 is RAID6 Q block.
5372 stripe_nr
= div_u64_rem(stripe_nr
,
5373 nr_data_stripes(map
), &stripe_index
);
5375 stripe_index
= nr_data_stripes(map
) +
5378 /* We distribute the parity blocks across stripes */
5379 div_u64_rem(stripe_nr
+ stripe_index
, map
->num_stripes
,
5381 if (!(rw
& (REQ_WRITE
| REQ_DISCARD
|
5382 REQ_GET_READ_MIRRORS
)) && mirror_num
<= 1)
5387 * after this, stripe_nr is the number of stripes on this
5388 * device we have to walk to find the data, and stripe_index is
5389 * the number of our device in the stripe array
5391 stripe_nr
= div_u64_rem(stripe_nr
, map
->num_stripes
,
5393 mirror_num
= stripe_index
+ 1;
5395 BUG_ON(stripe_index
>= map
->num_stripes
);
5397 num_alloc_stripes
= num_stripes
;
5398 if (dev_replace_is_ongoing
) {
5399 if (rw
& (REQ_WRITE
| REQ_DISCARD
))
5400 num_alloc_stripes
<<= 1;
5401 if (rw
& REQ_GET_READ_MIRRORS
)
5402 num_alloc_stripes
++;
5403 tgtdev_indexes
= num_stripes
;
5406 bbio
= alloc_btrfs_bio(num_alloc_stripes
, tgtdev_indexes
);
5411 if (dev_replace_is_ongoing
)
5412 bbio
->tgtdev_map
= (int *)(bbio
->stripes
+ num_alloc_stripes
);
5414 /* build raid_map */
5415 if (map
->type
& BTRFS_BLOCK_GROUP_RAID56_MASK
&&
5416 need_raid_map
&& ((rw
& (REQ_WRITE
| REQ_GET_READ_MIRRORS
)) ||
5421 bbio
->raid_map
= (u64
*)((void *)bbio
->stripes
+
5422 sizeof(struct btrfs_bio_stripe
) *
5424 sizeof(int) * tgtdev_indexes
);
5426 /* Work out the disk rotation on this stripe-set */
5427 div_u64_rem(stripe_nr
, num_stripes
, &rot
);
5429 /* Fill in the logical address of each stripe */
5430 tmp
= stripe_nr
* nr_data_stripes(map
);
5431 for (i
= 0; i
< nr_data_stripes(map
); i
++)
5432 bbio
->raid_map
[(i
+rot
) % num_stripes
] =
5433 em
->start
+ (tmp
+ i
) * map
->stripe_len
;
5435 bbio
->raid_map
[(i
+rot
) % map
->num_stripes
] = RAID5_P_STRIPE
;
5436 if (map
->type
& BTRFS_BLOCK_GROUP_RAID6
)
5437 bbio
->raid_map
[(i
+rot
+1) % num_stripes
] =
5441 if (rw
& REQ_DISCARD
) {
5443 u32 sub_stripes
= 0;
5444 u64 stripes_per_dev
= 0;
5445 u32 remaining_stripes
= 0;
5446 u32 last_stripe
= 0;
5449 (BTRFS_BLOCK_GROUP_RAID0
| BTRFS_BLOCK_GROUP_RAID10
)) {
5450 if (map
->type
& BTRFS_BLOCK_GROUP_RAID0
)
5453 sub_stripes
= map
->sub_stripes
;
5455 factor
= map
->num_stripes
/ sub_stripes
;
5456 stripes_per_dev
= div_u64_rem(stripe_nr_end
-
5459 &remaining_stripes
);
5460 div_u64_rem(stripe_nr_end
- 1, factor
, &last_stripe
);
5461 last_stripe
*= sub_stripes
;
5464 for (i
= 0; i
< num_stripes
; i
++) {
5465 bbio
->stripes
[i
].physical
=
5466 map
->stripes
[stripe_index
].physical
+
5467 stripe_offset
+ stripe_nr
* map
->stripe_len
;
5468 bbio
->stripes
[i
].dev
= map
->stripes
[stripe_index
].dev
;
5470 if (map
->type
& (BTRFS_BLOCK_GROUP_RAID0
|
5471 BTRFS_BLOCK_GROUP_RAID10
)) {
5472 bbio
->stripes
[i
].length
= stripes_per_dev
*
5475 if (i
/ sub_stripes
< remaining_stripes
)
5476 bbio
->stripes
[i
].length
+=
5480 * Special for the first stripe and
5483 * |-------|...|-------|
5487 if (i
< sub_stripes
)
5488 bbio
->stripes
[i
].length
-=
5491 if (stripe_index
>= last_stripe
&&
5492 stripe_index
<= (last_stripe
+
5494 bbio
->stripes
[i
].length
-=
5497 if (i
== sub_stripes
- 1)
5500 bbio
->stripes
[i
].length
= *length
;
5503 if (stripe_index
== map
->num_stripes
) {
5504 /* This could only happen for RAID0/10 */
5510 for (i
= 0; i
< num_stripes
; i
++) {
5511 bbio
->stripes
[i
].physical
=
5512 map
->stripes
[stripe_index
].physical
+
5514 stripe_nr
* map
->stripe_len
;
5515 bbio
->stripes
[i
].dev
=
5516 map
->stripes
[stripe_index
].dev
;
5521 if (rw
& (REQ_WRITE
| REQ_GET_READ_MIRRORS
))
5522 max_errors
= btrfs_chunk_max_errors(map
);
5525 sort_parity_stripes(bbio
, num_stripes
);
5528 if (dev_replace_is_ongoing
&& (rw
& (REQ_WRITE
| REQ_DISCARD
)) &&
5529 dev_replace
->tgtdev
!= NULL
) {
5530 int index_where_to_add
;
5531 u64 srcdev_devid
= dev_replace
->srcdev
->devid
;
5534 * duplicate the write operations while the dev replace
5535 * procedure is running. Since the copying of the old disk
5536 * to the new disk takes place at run time while the
5537 * filesystem is mounted writable, the regular write
5538 * operations to the old disk have to be duplicated to go
5539 * to the new disk as well.
5540 * Note that device->missing is handled by the caller, and
5541 * that the write to the old disk is already set up in the
5544 index_where_to_add
= num_stripes
;
5545 for (i
= 0; i
< num_stripes
; i
++) {
5546 if (bbio
->stripes
[i
].dev
->devid
== srcdev_devid
) {
5547 /* write to new disk, too */
5548 struct btrfs_bio_stripe
*new =
5549 bbio
->stripes
+ index_where_to_add
;
5550 struct btrfs_bio_stripe
*old
=
5553 new->physical
= old
->physical
;
5554 new->length
= old
->length
;
5555 new->dev
= dev_replace
->tgtdev
;
5556 bbio
->tgtdev_map
[i
] = index_where_to_add
;
5557 index_where_to_add
++;
5562 num_stripes
= index_where_to_add
;
5563 } else if (dev_replace_is_ongoing
&& (rw
& REQ_GET_READ_MIRRORS
) &&
5564 dev_replace
->tgtdev
!= NULL
) {
5565 u64 srcdev_devid
= dev_replace
->srcdev
->devid
;
5566 int index_srcdev
= 0;
5568 u64 physical_of_found
= 0;
5571 * During the dev-replace procedure, the target drive can
5572 * also be used to read data in case it is needed to repair
5573 * a corrupt block elsewhere. This is possible if the
5574 * requested area is left of the left cursor. In this area,
5575 * the target drive is a full copy of the source drive.
5577 for (i
= 0; i
< num_stripes
; i
++) {
5578 if (bbio
->stripes
[i
].dev
->devid
== srcdev_devid
) {
5580 * In case of DUP, in order to keep it
5581 * simple, only add the mirror with the
5582 * lowest physical address
5585 physical_of_found
<=
5586 bbio
->stripes
[i
].physical
)
5590 physical_of_found
= bbio
->stripes
[i
].physical
;
5594 if (physical_of_found
+ map
->stripe_len
<=
5595 dev_replace
->cursor_left
) {
5596 struct btrfs_bio_stripe
*tgtdev_stripe
=
5597 bbio
->stripes
+ num_stripes
;
5599 tgtdev_stripe
->physical
= physical_of_found
;
5600 tgtdev_stripe
->length
=
5601 bbio
->stripes
[index_srcdev
].length
;
5602 tgtdev_stripe
->dev
= dev_replace
->tgtdev
;
5603 bbio
->tgtdev_map
[index_srcdev
] = num_stripes
;
5612 bbio
->map_type
= map
->type
;
5613 bbio
->num_stripes
= num_stripes
;
5614 bbio
->max_errors
= max_errors
;
5615 bbio
->mirror_num
= mirror_num
;
5616 bbio
->num_tgtdevs
= tgtdev_indexes
;
5619 * this is the case that REQ_READ && dev_replace_is_ongoing &&
5620 * mirror_num == num_stripes + 1 && dev_replace target drive is
5621 * available as a mirror
5623 if (patch_the_first_stripe_for_dev_replace
&& num_stripes
> 0) {
5624 WARN_ON(num_stripes
> 1);
5625 bbio
->stripes
[0].dev
= dev_replace
->tgtdev
;
5626 bbio
->stripes
[0].physical
= physical_to_patch_in_first_stripe
;
5627 bbio
->mirror_num
= map
->num_stripes
+ 1;
5630 if (dev_replace_is_ongoing
)
5631 btrfs_dev_replace_unlock(dev_replace
);
5632 free_extent_map(em
);
5636 int btrfs_map_block(struct btrfs_fs_info
*fs_info
, int rw
,
5637 u64 logical
, u64
*length
,
5638 struct btrfs_bio
**bbio_ret
, int mirror_num
)
5640 return __btrfs_map_block(fs_info
, rw
, logical
, length
, bbio_ret
,
5644 /* For Scrub/replace */
5645 int btrfs_map_sblock(struct btrfs_fs_info
*fs_info
, int rw
,
5646 u64 logical
, u64
*length
,
5647 struct btrfs_bio
**bbio_ret
, int mirror_num
,
5650 return __btrfs_map_block(fs_info
, rw
, logical
, length
, bbio_ret
,
5651 mirror_num
, need_raid_map
);
5654 int btrfs_rmap_block(struct btrfs_mapping_tree
*map_tree
,
5655 u64 chunk_start
, u64 physical
, u64 devid
,
5656 u64
**logical
, int *naddrs
, int *stripe_len
)
5658 struct extent_map_tree
*em_tree
= &map_tree
->map_tree
;
5659 struct extent_map
*em
;
5660 struct map_lookup
*map
;
5668 read_lock(&em_tree
->lock
);
5669 em
= lookup_extent_mapping(em_tree
, chunk_start
, 1);
5670 read_unlock(&em_tree
->lock
);
5673 printk(KERN_ERR
"BTRFS: couldn't find em for chunk %Lu\n",
5678 if (em
->start
!= chunk_start
) {
5679 printk(KERN_ERR
"BTRFS: bad chunk start, em=%Lu, wanted=%Lu\n",
5680 em
->start
, chunk_start
);
5681 free_extent_map(em
);
5684 map
= (struct map_lookup
*)em
->bdev
;
5687 rmap_len
= map
->stripe_len
;
5689 if (map
->type
& BTRFS_BLOCK_GROUP_RAID10
)
5690 length
= div_u64(length
, map
->num_stripes
/ map
->sub_stripes
);
5691 else if (map
->type
& BTRFS_BLOCK_GROUP_RAID0
)
5692 length
= div_u64(length
, map
->num_stripes
);
5693 else if (map
->type
& BTRFS_BLOCK_GROUP_RAID56_MASK
) {
5694 length
= div_u64(length
, nr_data_stripes(map
));
5695 rmap_len
= map
->stripe_len
* nr_data_stripes(map
);
5698 buf
= kcalloc(map
->num_stripes
, sizeof(u64
), GFP_NOFS
);
5699 BUG_ON(!buf
); /* -ENOMEM */
5701 for (i
= 0; i
< map
->num_stripes
; i
++) {
5702 if (devid
&& map
->stripes
[i
].dev
->devid
!= devid
)
5704 if (map
->stripes
[i
].physical
> physical
||
5705 map
->stripes
[i
].physical
+ length
<= physical
)
5708 stripe_nr
= physical
- map
->stripes
[i
].physical
;
5709 stripe_nr
= div_u64(stripe_nr
, map
->stripe_len
);
5711 if (map
->type
& BTRFS_BLOCK_GROUP_RAID10
) {
5712 stripe_nr
= stripe_nr
* map
->num_stripes
+ i
;
5713 stripe_nr
= div_u64(stripe_nr
, map
->sub_stripes
);
5714 } else if (map
->type
& BTRFS_BLOCK_GROUP_RAID0
) {
5715 stripe_nr
= stripe_nr
* map
->num_stripes
+ i
;
5716 } /* else if RAID[56], multiply by nr_data_stripes().
5717 * Alternatively, just use rmap_len below instead of
5718 * map->stripe_len */
5720 bytenr
= chunk_start
+ stripe_nr
* rmap_len
;
5721 WARN_ON(nr
>= map
->num_stripes
);
5722 for (j
= 0; j
< nr
; j
++) {
5723 if (buf
[j
] == bytenr
)
5727 WARN_ON(nr
>= map
->num_stripes
);
5734 *stripe_len
= rmap_len
;
5736 free_extent_map(em
);
5740 static inline void btrfs_end_bbio(struct btrfs_bio
*bbio
, struct bio
*bio
)
5742 bio
->bi_private
= bbio
->private;
5743 bio
->bi_end_io
= bbio
->end_io
;
5746 btrfs_put_bbio(bbio
);
5749 static void btrfs_end_bio(struct bio
*bio
)
5751 struct btrfs_bio
*bbio
= bio
->bi_private
;
5752 int is_orig_bio
= 0;
5754 if (bio
->bi_error
) {
5755 atomic_inc(&bbio
->error
);
5756 if (bio
->bi_error
== -EIO
|| bio
->bi_error
== -EREMOTEIO
) {
5757 unsigned int stripe_index
=
5758 btrfs_io_bio(bio
)->stripe_index
;
5759 struct btrfs_device
*dev
;
5761 BUG_ON(stripe_index
>= bbio
->num_stripes
);
5762 dev
= bbio
->stripes
[stripe_index
].dev
;
5764 if (bio
->bi_rw
& WRITE
)
5765 btrfs_dev_stat_inc(dev
,
5766 BTRFS_DEV_STAT_WRITE_ERRS
);
5768 btrfs_dev_stat_inc(dev
,
5769 BTRFS_DEV_STAT_READ_ERRS
);
5770 if ((bio
->bi_rw
& WRITE_FLUSH
) == WRITE_FLUSH
)
5771 btrfs_dev_stat_inc(dev
,
5772 BTRFS_DEV_STAT_FLUSH_ERRS
);
5773 btrfs_dev_stat_print_on_error(dev
);
5778 if (bio
== bbio
->orig_bio
)
5781 btrfs_bio_counter_dec(bbio
->fs_info
);
5783 if (atomic_dec_and_test(&bbio
->stripes_pending
)) {
5786 bio
= bbio
->orig_bio
;
5789 btrfs_io_bio(bio
)->mirror_num
= bbio
->mirror_num
;
5790 /* only send an error to the higher layers if it is
5791 * beyond the tolerance of the btrfs bio
5793 if (atomic_read(&bbio
->error
) > bbio
->max_errors
) {
5794 bio
->bi_error
= -EIO
;
5797 * this bio is actually up to date, we didn't
5798 * go over the max number of errors
5803 btrfs_end_bbio(bbio
, bio
);
5804 } else if (!is_orig_bio
) {
5810 * see run_scheduled_bios for a description of why bios are collected for
5813 * This will add one bio to the pending list for a device and make sure
5814 * the work struct is scheduled.
5816 static noinline
void btrfs_schedule_bio(struct btrfs_root
*root
,
5817 struct btrfs_device
*device
,
5818 int rw
, struct bio
*bio
)
5820 int should_queue
= 1;
5821 struct btrfs_pending_bios
*pending_bios
;
5823 if (device
->missing
|| !device
->bdev
) {
5828 /* don't bother with additional async steps for reads, right now */
5829 if (!(rw
& REQ_WRITE
)) {
5831 btrfsic_submit_bio(rw
, bio
);
5837 * nr_async_bios allows us to reliably return congestion to the
5838 * higher layers. Otherwise, the async bio makes it appear we have
5839 * made progress against dirty pages when we've really just put it
5840 * on a queue for later
5842 atomic_inc(&root
->fs_info
->nr_async_bios
);
5843 WARN_ON(bio
->bi_next
);
5844 bio
->bi_next
= NULL
;
5847 spin_lock(&device
->io_lock
);
5848 if (bio
->bi_rw
& REQ_SYNC
)
5849 pending_bios
= &device
->pending_sync_bios
;
5851 pending_bios
= &device
->pending_bios
;
5853 if (pending_bios
->tail
)
5854 pending_bios
->tail
->bi_next
= bio
;
5856 pending_bios
->tail
= bio
;
5857 if (!pending_bios
->head
)
5858 pending_bios
->head
= bio
;
5859 if (device
->running_pending
)
5862 spin_unlock(&device
->io_lock
);
5865 btrfs_queue_work(root
->fs_info
->submit_workers
,
5869 static void submit_stripe_bio(struct btrfs_root
*root
, struct btrfs_bio
*bbio
,
5870 struct bio
*bio
, u64 physical
, int dev_nr
,
5873 struct btrfs_device
*dev
= bbio
->stripes
[dev_nr
].dev
;
5875 bio
->bi_private
= bbio
;
5876 btrfs_io_bio(bio
)->stripe_index
= dev_nr
;
5877 bio
->bi_end_io
= btrfs_end_bio
;
5878 bio
->bi_iter
.bi_sector
= physical
>> 9;
5881 struct rcu_string
*name
;
5884 name
= rcu_dereference(dev
->name
);
5885 pr_debug("btrfs_map_bio: rw %d, sector=%llu, dev=%lu "
5886 "(%s id %llu), size=%u\n", rw
,
5887 (u64
)bio
->bi_iter
.bi_sector
, (u_long
)dev
->bdev
->bd_dev
,
5888 name
->str
, dev
->devid
, bio
->bi_iter
.bi_size
);
5892 bio
->bi_bdev
= dev
->bdev
;
5894 btrfs_bio_counter_inc_noblocked(root
->fs_info
);
5897 btrfs_schedule_bio(root
, dev
, rw
, bio
);
5899 btrfsic_submit_bio(rw
, bio
);
5902 static void bbio_error(struct btrfs_bio
*bbio
, struct bio
*bio
, u64 logical
)
5904 atomic_inc(&bbio
->error
);
5905 if (atomic_dec_and_test(&bbio
->stripes_pending
)) {
5906 /* Shoud be the original bio. */
5907 WARN_ON(bio
!= bbio
->orig_bio
);
5909 btrfs_io_bio(bio
)->mirror_num
= bbio
->mirror_num
;
5910 bio
->bi_iter
.bi_sector
= logical
>> 9;
5911 bio
->bi_error
= -EIO
;
5912 btrfs_end_bbio(bbio
, bio
);
5916 int btrfs_map_bio(struct btrfs_root
*root
, int rw
, struct bio
*bio
,
5917 int mirror_num
, int async_submit
)
5919 struct btrfs_device
*dev
;
5920 struct bio
*first_bio
= bio
;
5921 u64 logical
= (u64
)bio
->bi_iter
.bi_sector
<< 9;
5927 struct btrfs_bio
*bbio
= NULL
;
5929 length
= bio
->bi_iter
.bi_size
;
5930 map_length
= length
;
5932 btrfs_bio_counter_inc_blocked(root
->fs_info
);
5933 ret
= __btrfs_map_block(root
->fs_info
, rw
, logical
, &map_length
, &bbio
,
5936 btrfs_bio_counter_dec(root
->fs_info
);
5940 total_devs
= bbio
->num_stripes
;
5941 bbio
->orig_bio
= first_bio
;
5942 bbio
->private = first_bio
->bi_private
;
5943 bbio
->end_io
= first_bio
->bi_end_io
;
5944 bbio
->fs_info
= root
->fs_info
;
5945 atomic_set(&bbio
->stripes_pending
, bbio
->num_stripes
);
5947 if (bbio
->raid_map
) {
5948 /* In this case, map_length has been set to the length of
5949 a single stripe; not the whole write */
5951 ret
= raid56_parity_write(root
, bio
, bbio
, map_length
);
5953 ret
= raid56_parity_recover(root
, bio
, bbio
, map_length
,
5957 btrfs_bio_counter_dec(root
->fs_info
);
5961 if (map_length
< length
) {
5962 btrfs_crit(root
->fs_info
, "mapping failed logical %llu bio len %llu len %llu",
5963 logical
, length
, map_length
);
5967 for (dev_nr
= 0; dev_nr
< total_devs
; dev_nr
++) {
5968 dev
= bbio
->stripes
[dev_nr
].dev
;
5969 if (!dev
|| !dev
->bdev
|| (rw
& WRITE
&& !dev
->writeable
)) {
5970 bbio_error(bbio
, first_bio
, logical
);
5974 if (dev_nr
< total_devs
- 1) {
5975 bio
= btrfs_bio_clone(first_bio
, GFP_NOFS
);
5976 BUG_ON(!bio
); /* -ENOMEM */
5980 submit_stripe_bio(root
, bbio
, bio
,
5981 bbio
->stripes
[dev_nr
].physical
, dev_nr
, rw
,
5984 btrfs_bio_counter_dec(root
->fs_info
);
5988 struct btrfs_device
*btrfs_find_device(struct btrfs_fs_info
*fs_info
, u64 devid
,
5991 struct btrfs_device
*device
;
5992 struct btrfs_fs_devices
*cur_devices
;
5994 cur_devices
= fs_info
->fs_devices
;
5995 while (cur_devices
) {
5997 !memcmp(cur_devices
->fsid
, fsid
, BTRFS_UUID_SIZE
)) {
5998 device
= __find_device(&cur_devices
->devices
,
6003 cur_devices
= cur_devices
->seed
;
6008 static struct btrfs_device
*add_missing_dev(struct btrfs_root
*root
,
6009 struct btrfs_fs_devices
*fs_devices
,
6010 u64 devid
, u8
*dev_uuid
)
6012 struct btrfs_device
*device
;
6014 device
= btrfs_alloc_device(NULL
, &devid
, dev_uuid
);
6018 list_add(&device
->dev_list
, &fs_devices
->devices
);
6019 device
->fs_devices
= fs_devices
;
6020 fs_devices
->num_devices
++;
6022 device
->missing
= 1;
6023 fs_devices
->missing_devices
++;
6029 * btrfs_alloc_device - allocate struct btrfs_device
6030 * @fs_info: used only for generating a new devid, can be NULL if
6031 * devid is provided (i.e. @devid != NULL).
6032 * @devid: a pointer to devid for this device. If NULL a new devid
6034 * @uuid: a pointer to UUID for this device. If NULL a new UUID
6037 * Return: a pointer to a new &struct btrfs_device on success; ERR_PTR()
6038 * on error. Returned struct is not linked onto any lists and can be
6039 * destroyed with kfree() right away.
6041 struct btrfs_device
*btrfs_alloc_device(struct btrfs_fs_info
*fs_info
,
6045 struct btrfs_device
*dev
;
6048 if (WARN_ON(!devid
&& !fs_info
))
6049 return ERR_PTR(-EINVAL
);
6051 dev
= __alloc_device();
6060 ret
= find_next_devid(fs_info
, &tmp
);
6063 return ERR_PTR(ret
);
6069 memcpy(dev
->uuid
, uuid
, BTRFS_UUID_SIZE
);
6071 generate_random_uuid(dev
->uuid
);
6073 btrfs_init_work(&dev
->work
, btrfs_submit_helper
,
6074 pending_bios_fn
, NULL
, NULL
);
6079 static int read_one_chunk(struct btrfs_root
*root
, struct btrfs_key
*key
,
6080 struct extent_buffer
*leaf
,
6081 struct btrfs_chunk
*chunk
)
6083 struct btrfs_mapping_tree
*map_tree
= &root
->fs_info
->mapping_tree
;
6084 struct map_lookup
*map
;
6085 struct extent_map
*em
;
6089 u8 uuid
[BTRFS_UUID_SIZE
];
6094 logical
= key
->offset
;
6095 length
= btrfs_chunk_length(leaf
, chunk
);
6097 read_lock(&map_tree
->map_tree
.lock
);
6098 em
= lookup_extent_mapping(&map_tree
->map_tree
, logical
, 1);
6099 read_unlock(&map_tree
->map_tree
.lock
);
6101 /* already mapped? */
6102 if (em
&& em
->start
<= logical
&& em
->start
+ em
->len
> logical
) {
6103 free_extent_map(em
);
6106 free_extent_map(em
);
6109 em
= alloc_extent_map();
6112 num_stripes
= btrfs_chunk_num_stripes(leaf
, chunk
);
6113 map
= kmalloc(map_lookup_size(num_stripes
), GFP_NOFS
);
6115 free_extent_map(em
);
6119 set_bit(EXTENT_FLAG_FS_MAPPING
, &em
->flags
);
6120 em
->bdev
= (struct block_device
*)map
;
6121 em
->start
= logical
;
6124 em
->block_start
= 0;
6125 em
->block_len
= em
->len
;
6127 map
->num_stripes
= num_stripes
;
6128 map
->io_width
= btrfs_chunk_io_width(leaf
, chunk
);
6129 map
->io_align
= btrfs_chunk_io_align(leaf
, chunk
);
6130 map
->sector_size
= btrfs_chunk_sector_size(leaf
, chunk
);
6131 map
->stripe_len
= btrfs_chunk_stripe_len(leaf
, chunk
);
6132 map
->type
= btrfs_chunk_type(leaf
, chunk
);
6133 map
->sub_stripes
= btrfs_chunk_sub_stripes(leaf
, chunk
);
6134 for (i
= 0; i
< num_stripes
; i
++) {
6135 map
->stripes
[i
].physical
=
6136 btrfs_stripe_offset_nr(leaf
, chunk
, i
);
6137 devid
= btrfs_stripe_devid_nr(leaf
, chunk
, i
);
6138 read_extent_buffer(leaf
, uuid
, (unsigned long)
6139 btrfs_stripe_dev_uuid_nr(chunk
, i
),
6141 map
->stripes
[i
].dev
= btrfs_find_device(root
->fs_info
, devid
,
6143 if (!map
->stripes
[i
].dev
&& !btrfs_test_opt(root
, DEGRADED
)) {
6144 free_extent_map(em
);
6147 if (!map
->stripes
[i
].dev
) {
6148 map
->stripes
[i
].dev
=
6149 add_missing_dev(root
, root
->fs_info
->fs_devices
,
6151 if (!map
->stripes
[i
].dev
) {
6152 free_extent_map(em
);
6155 btrfs_warn(root
->fs_info
, "devid %llu uuid %pU is missing",
6158 map
->stripes
[i
].dev
->in_fs_metadata
= 1;
6161 write_lock(&map_tree
->map_tree
.lock
);
6162 ret
= add_extent_mapping(&map_tree
->map_tree
, em
, 0);
6163 write_unlock(&map_tree
->map_tree
.lock
);
6164 BUG_ON(ret
); /* Tree corruption */
6165 free_extent_map(em
);
6170 static void fill_device_from_item(struct extent_buffer
*leaf
,
6171 struct btrfs_dev_item
*dev_item
,
6172 struct btrfs_device
*device
)
6176 device
->devid
= btrfs_device_id(leaf
, dev_item
);
6177 device
->disk_total_bytes
= btrfs_device_total_bytes(leaf
, dev_item
);
6178 device
->total_bytes
= device
->disk_total_bytes
;
6179 device
->commit_total_bytes
= device
->disk_total_bytes
;
6180 device
->bytes_used
= btrfs_device_bytes_used(leaf
, dev_item
);
6181 device
->commit_bytes_used
= device
->bytes_used
;
6182 device
->type
= btrfs_device_type(leaf
, dev_item
);
6183 device
->io_align
= btrfs_device_io_align(leaf
, dev_item
);
6184 device
->io_width
= btrfs_device_io_width(leaf
, dev_item
);
6185 device
->sector_size
= btrfs_device_sector_size(leaf
, dev_item
);
6186 WARN_ON(device
->devid
== BTRFS_DEV_REPLACE_DEVID
);
6187 device
->is_tgtdev_for_dev_replace
= 0;
6189 ptr
= btrfs_device_uuid(dev_item
);
6190 read_extent_buffer(leaf
, device
->uuid
, ptr
, BTRFS_UUID_SIZE
);
6193 static struct btrfs_fs_devices
*open_seed_devices(struct btrfs_root
*root
,
6196 struct btrfs_fs_devices
*fs_devices
;
6199 BUG_ON(!mutex_is_locked(&uuid_mutex
));
6201 fs_devices
= root
->fs_info
->fs_devices
->seed
;
6202 while (fs_devices
) {
6203 if (!memcmp(fs_devices
->fsid
, fsid
, BTRFS_UUID_SIZE
))
6206 fs_devices
= fs_devices
->seed
;
6209 fs_devices
= find_fsid(fsid
);
6211 if (!btrfs_test_opt(root
, DEGRADED
))
6212 return ERR_PTR(-ENOENT
);
6214 fs_devices
= alloc_fs_devices(fsid
);
6215 if (IS_ERR(fs_devices
))
6218 fs_devices
->seeding
= 1;
6219 fs_devices
->opened
= 1;
6223 fs_devices
= clone_fs_devices(fs_devices
);
6224 if (IS_ERR(fs_devices
))
6227 ret
= __btrfs_open_devices(fs_devices
, FMODE_READ
,
6228 root
->fs_info
->bdev_holder
);
6230 free_fs_devices(fs_devices
);
6231 fs_devices
= ERR_PTR(ret
);
6235 if (!fs_devices
->seeding
) {
6236 __btrfs_close_devices(fs_devices
);
6237 free_fs_devices(fs_devices
);
6238 fs_devices
= ERR_PTR(-EINVAL
);
6242 fs_devices
->seed
= root
->fs_info
->fs_devices
->seed
;
6243 root
->fs_info
->fs_devices
->seed
= fs_devices
;
6248 static int read_one_dev(struct btrfs_root
*root
,
6249 struct extent_buffer
*leaf
,
6250 struct btrfs_dev_item
*dev_item
)
6252 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
6253 struct btrfs_device
*device
;
6256 u8 fs_uuid
[BTRFS_UUID_SIZE
];
6257 u8 dev_uuid
[BTRFS_UUID_SIZE
];
6259 devid
= btrfs_device_id(leaf
, dev_item
);
6260 read_extent_buffer(leaf
, dev_uuid
, btrfs_device_uuid(dev_item
),
6262 read_extent_buffer(leaf
, fs_uuid
, btrfs_device_fsid(dev_item
),
6265 if (memcmp(fs_uuid
, root
->fs_info
->fsid
, BTRFS_UUID_SIZE
)) {
6266 fs_devices
= open_seed_devices(root
, fs_uuid
);
6267 if (IS_ERR(fs_devices
))
6268 return PTR_ERR(fs_devices
);
6271 device
= btrfs_find_device(root
->fs_info
, devid
, dev_uuid
, fs_uuid
);
6273 if (!btrfs_test_opt(root
, DEGRADED
))
6276 device
= add_missing_dev(root
, fs_devices
, devid
, dev_uuid
);
6279 btrfs_warn(root
->fs_info
, "devid %llu uuid %pU missing",
6282 if (!device
->bdev
&& !btrfs_test_opt(root
, DEGRADED
))
6285 if(!device
->bdev
&& !device
->missing
) {
6287 * this happens when a device that was properly setup
6288 * in the device info lists suddenly goes bad.
6289 * device->bdev is NULL, and so we have to set
6290 * device->missing to one here
6292 device
->fs_devices
->missing_devices
++;
6293 device
->missing
= 1;
6296 /* Move the device to its own fs_devices */
6297 if (device
->fs_devices
!= fs_devices
) {
6298 ASSERT(device
->missing
);
6300 list_move(&device
->dev_list
, &fs_devices
->devices
);
6301 device
->fs_devices
->num_devices
--;
6302 fs_devices
->num_devices
++;
6304 device
->fs_devices
->missing_devices
--;
6305 fs_devices
->missing_devices
++;
6307 device
->fs_devices
= fs_devices
;
6311 if (device
->fs_devices
!= root
->fs_info
->fs_devices
) {
6312 BUG_ON(device
->writeable
);
6313 if (device
->generation
!=
6314 btrfs_device_generation(leaf
, dev_item
))
6318 fill_device_from_item(leaf
, dev_item
, device
);
6319 device
->in_fs_metadata
= 1;
6320 if (device
->writeable
&& !device
->is_tgtdev_for_dev_replace
) {
6321 device
->fs_devices
->total_rw_bytes
+= device
->total_bytes
;
6322 spin_lock(&root
->fs_info
->free_chunk_lock
);
6323 root
->fs_info
->free_chunk_space
+= device
->total_bytes
-
6325 spin_unlock(&root
->fs_info
->free_chunk_lock
);
6331 int btrfs_read_sys_array(struct btrfs_root
*root
)
6333 struct btrfs_super_block
*super_copy
= root
->fs_info
->super_copy
;
6334 struct extent_buffer
*sb
;
6335 struct btrfs_disk_key
*disk_key
;
6336 struct btrfs_chunk
*chunk
;
6338 unsigned long sb_array_offset
;
6344 struct btrfs_key key
;
6346 ASSERT(BTRFS_SUPER_INFO_SIZE
<= root
->nodesize
);
6348 * This will create extent buffer of nodesize, superblock size is
6349 * fixed to BTRFS_SUPER_INFO_SIZE. If nodesize > sb size, this will
6350 * overallocate but we can keep it as-is, only the first page is used.
6352 sb
= btrfs_find_create_tree_block(root
, BTRFS_SUPER_INFO_OFFSET
);
6355 btrfs_set_buffer_uptodate(sb
);
6356 btrfs_set_buffer_lockdep_class(root
->root_key
.objectid
, sb
, 0);
6358 * The sb extent buffer is artifical and just used to read the system array.
6359 * btrfs_set_buffer_uptodate() call does not properly mark all it's
6360 * pages up-to-date when the page is larger: extent does not cover the
6361 * whole page and consequently check_page_uptodate does not find all
6362 * the page's extents up-to-date (the hole beyond sb),
6363 * write_extent_buffer then triggers a WARN_ON.
6365 * Regular short extents go through mark_extent_buffer_dirty/writeback cycle,
6366 * but sb spans only this function. Add an explicit SetPageUptodate call
6367 * to silence the warning eg. on PowerPC 64.
6369 if (PAGE_CACHE_SIZE
> BTRFS_SUPER_INFO_SIZE
)
6370 SetPageUptodate(sb
->pages
[0]);
6372 write_extent_buffer(sb
, super_copy
, 0, BTRFS_SUPER_INFO_SIZE
);
6373 array_size
= btrfs_super_sys_array_size(super_copy
);
6375 array_ptr
= super_copy
->sys_chunk_array
;
6376 sb_array_offset
= offsetof(struct btrfs_super_block
, sys_chunk_array
);
6379 while (cur_offset
< array_size
) {
6380 disk_key
= (struct btrfs_disk_key
*)array_ptr
;
6381 len
= sizeof(*disk_key
);
6382 if (cur_offset
+ len
> array_size
)
6383 goto out_short_read
;
6385 btrfs_disk_key_to_cpu(&key
, disk_key
);
6388 sb_array_offset
+= len
;
6391 if (key
.type
== BTRFS_CHUNK_ITEM_KEY
) {
6392 chunk
= (struct btrfs_chunk
*)sb_array_offset
;
6394 * At least one btrfs_chunk with one stripe must be
6395 * present, exact stripe count check comes afterwards
6397 len
= btrfs_chunk_item_size(1);
6398 if (cur_offset
+ len
> array_size
)
6399 goto out_short_read
;
6401 num_stripes
= btrfs_chunk_num_stripes(sb
, chunk
);
6402 len
= btrfs_chunk_item_size(num_stripes
);
6403 if (cur_offset
+ len
> array_size
)
6404 goto out_short_read
;
6406 ret
= read_one_chunk(root
, &key
, sb
, chunk
);
6414 sb_array_offset
+= len
;
6417 free_extent_buffer(sb
);
6421 printk(KERN_ERR
"BTRFS: sys_array too short to read %u bytes at offset %u\n",
6423 free_extent_buffer(sb
);
6427 int btrfs_read_chunk_tree(struct btrfs_root
*root
)
6429 struct btrfs_path
*path
;
6430 struct extent_buffer
*leaf
;
6431 struct btrfs_key key
;
6432 struct btrfs_key found_key
;
6436 root
= root
->fs_info
->chunk_root
;
6438 path
= btrfs_alloc_path();
6442 mutex_lock(&uuid_mutex
);
6446 * Read all device items, and then all the chunk items. All
6447 * device items are found before any chunk item (their object id
6448 * is smaller than the lowest possible object id for a chunk
6449 * item - BTRFS_FIRST_CHUNK_TREE_OBJECTID).
6451 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
6454 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
6458 leaf
= path
->nodes
[0];
6459 slot
= path
->slots
[0];
6460 if (slot
>= btrfs_header_nritems(leaf
)) {
6461 ret
= btrfs_next_leaf(root
, path
);
6468 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
6469 if (found_key
.type
== BTRFS_DEV_ITEM_KEY
) {
6470 struct btrfs_dev_item
*dev_item
;
6471 dev_item
= btrfs_item_ptr(leaf
, slot
,
6472 struct btrfs_dev_item
);
6473 ret
= read_one_dev(root
, leaf
, dev_item
);
6476 } else if (found_key
.type
== BTRFS_CHUNK_ITEM_KEY
) {
6477 struct btrfs_chunk
*chunk
;
6478 chunk
= btrfs_item_ptr(leaf
, slot
, struct btrfs_chunk
);
6479 ret
= read_one_chunk(root
, &found_key
, leaf
, chunk
);
6487 unlock_chunks(root
);
6488 mutex_unlock(&uuid_mutex
);
6490 btrfs_free_path(path
);
6494 void btrfs_init_devices_late(struct btrfs_fs_info
*fs_info
)
6496 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
6497 struct btrfs_device
*device
;
6499 while (fs_devices
) {
6500 mutex_lock(&fs_devices
->device_list_mutex
);
6501 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
)
6502 device
->dev_root
= fs_info
->dev_root
;
6503 mutex_unlock(&fs_devices
->device_list_mutex
);
6505 fs_devices
= fs_devices
->seed
;
6509 static void __btrfs_reset_dev_stats(struct btrfs_device
*dev
)
6513 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++)
6514 btrfs_dev_stat_reset(dev
, i
);
6517 int btrfs_init_dev_stats(struct btrfs_fs_info
*fs_info
)
6519 struct btrfs_key key
;
6520 struct btrfs_key found_key
;
6521 struct btrfs_root
*dev_root
= fs_info
->dev_root
;
6522 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
6523 struct extent_buffer
*eb
;
6526 struct btrfs_device
*device
;
6527 struct btrfs_path
*path
= NULL
;
6530 path
= btrfs_alloc_path();
6536 mutex_lock(&fs_devices
->device_list_mutex
);
6537 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
) {
6539 struct btrfs_dev_stats_item
*ptr
;
6542 key
.type
= BTRFS_DEV_STATS_KEY
;
6543 key
.offset
= device
->devid
;
6544 ret
= btrfs_search_slot(NULL
, dev_root
, &key
, path
, 0, 0);
6546 __btrfs_reset_dev_stats(device
);
6547 device
->dev_stats_valid
= 1;
6548 btrfs_release_path(path
);
6551 slot
= path
->slots
[0];
6552 eb
= path
->nodes
[0];
6553 btrfs_item_key_to_cpu(eb
, &found_key
, slot
);
6554 item_size
= btrfs_item_size_nr(eb
, slot
);
6556 ptr
= btrfs_item_ptr(eb
, slot
,
6557 struct btrfs_dev_stats_item
);
6559 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++) {
6560 if (item_size
>= (1 + i
) * sizeof(__le64
))
6561 btrfs_dev_stat_set(device
, i
,
6562 btrfs_dev_stats_value(eb
, ptr
, i
));
6564 btrfs_dev_stat_reset(device
, i
);
6567 device
->dev_stats_valid
= 1;
6568 btrfs_dev_stat_print_on_load(device
);
6569 btrfs_release_path(path
);
6571 mutex_unlock(&fs_devices
->device_list_mutex
);
6574 btrfs_free_path(path
);
6575 return ret
< 0 ? ret
: 0;
6578 static int update_dev_stat_item(struct btrfs_trans_handle
*trans
,
6579 struct btrfs_root
*dev_root
,
6580 struct btrfs_device
*device
)
6582 struct btrfs_path
*path
;
6583 struct btrfs_key key
;
6584 struct extent_buffer
*eb
;
6585 struct btrfs_dev_stats_item
*ptr
;
6590 key
.type
= BTRFS_DEV_STATS_KEY
;
6591 key
.offset
= device
->devid
;
6593 path
= btrfs_alloc_path();
6595 ret
= btrfs_search_slot(trans
, dev_root
, &key
, path
, -1, 1);
6597 printk_in_rcu(KERN_WARNING
"BTRFS: "
6598 "error %d while searching for dev_stats item for device %s!\n",
6599 ret
, rcu_str_deref(device
->name
));
6604 btrfs_item_size_nr(path
->nodes
[0], path
->slots
[0]) < sizeof(*ptr
)) {
6605 /* need to delete old one and insert a new one */
6606 ret
= btrfs_del_item(trans
, dev_root
, path
);
6608 printk_in_rcu(KERN_WARNING
"BTRFS: "
6609 "delete too small dev_stats item for device %s failed %d!\n",
6610 rcu_str_deref(device
->name
), ret
);
6617 /* need to insert a new item */
6618 btrfs_release_path(path
);
6619 ret
= btrfs_insert_empty_item(trans
, dev_root
, path
,
6620 &key
, sizeof(*ptr
));
6622 printk_in_rcu(KERN_WARNING
"BTRFS: "
6623 "insert dev_stats item for device %s failed %d!\n",
6624 rcu_str_deref(device
->name
), ret
);
6629 eb
= path
->nodes
[0];
6630 ptr
= btrfs_item_ptr(eb
, path
->slots
[0], struct btrfs_dev_stats_item
);
6631 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++)
6632 btrfs_set_dev_stats_value(eb
, ptr
, i
,
6633 btrfs_dev_stat_read(device
, i
));
6634 btrfs_mark_buffer_dirty(eb
);
6637 btrfs_free_path(path
);
6642 * called from commit_transaction. Writes all changed device stats to disk.
6644 int btrfs_run_dev_stats(struct btrfs_trans_handle
*trans
,
6645 struct btrfs_fs_info
*fs_info
)
6647 struct btrfs_root
*dev_root
= fs_info
->dev_root
;
6648 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
6649 struct btrfs_device
*device
;
6653 mutex_lock(&fs_devices
->device_list_mutex
);
6654 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
) {
6655 if (!device
->dev_stats_valid
|| !btrfs_dev_stats_dirty(device
))
6658 stats_cnt
= atomic_read(&device
->dev_stats_ccnt
);
6659 ret
= update_dev_stat_item(trans
, dev_root
, device
);
6661 atomic_sub(stats_cnt
, &device
->dev_stats_ccnt
);
6663 mutex_unlock(&fs_devices
->device_list_mutex
);
6668 void btrfs_dev_stat_inc_and_print(struct btrfs_device
*dev
, int index
)
6670 btrfs_dev_stat_inc(dev
, index
);
6671 btrfs_dev_stat_print_on_error(dev
);
6674 static void btrfs_dev_stat_print_on_error(struct btrfs_device
*dev
)
6676 if (!dev
->dev_stats_valid
)
6678 printk_ratelimited_in_rcu(KERN_ERR
"BTRFS: "
6679 "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n",
6680 rcu_str_deref(dev
->name
),
6681 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_WRITE_ERRS
),
6682 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_READ_ERRS
),
6683 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_FLUSH_ERRS
),
6684 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_CORRUPTION_ERRS
),
6685 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_GENERATION_ERRS
));
6688 static void btrfs_dev_stat_print_on_load(struct btrfs_device
*dev
)
6692 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++)
6693 if (btrfs_dev_stat_read(dev
, i
) != 0)
6695 if (i
== BTRFS_DEV_STAT_VALUES_MAX
)
6696 return; /* all values == 0, suppress message */
6698 printk_in_rcu(KERN_INFO
"BTRFS: "
6699 "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n",
6700 rcu_str_deref(dev
->name
),
6701 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_WRITE_ERRS
),
6702 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_READ_ERRS
),
6703 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_FLUSH_ERRS
),
6704 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_CORRUPTION_ERRS
),
6705 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_GENERATION_ERRS
));
6708 int btrfs_get_dev_stats(struct btrfs_root
*root
,
6709 struct btrfs_ioctl_get_dev_stats
*stats
)
6711 struct btrfs_device
*dev
;
6712 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
6715 mutex_lock(&fs_devices
->device_list_mutex
);
6716 dev
= btrfs_find_device(root
->fs_info
, stats
->devid
, NULL
, NULL
);
6717 mutex_unlock(&fs_devices
->device_list_mutex
);
6720 btrfs_warn(root
->fs_info
, "get dev_stats failed, device not found");
6722 } else if (!dev
->dev_stats_valid
) {
6723 btrfs_warn(root
->fs_info
, "get dev_stats failed, not yet valid");
6725 } else if (stats
->flags
& BTRFS_DEV_STATS_RESET
) {
6726 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++) {
6727 if (stats
->nr_items
> i
)
6729 btrfs_dev_stat_read_and_reset(dev
, i
);
6731 btrfs_dev_stat_reset(dev
, i
);
6734 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++)
6735 if (stats
->nr_items
> i
)
6736 stats
->values
[i
] = btrfs_dev_stat_read(dev
, i
);
6738 if (stats
->nr_items
> BTRFS_DEV_STAT_VALUES_MAX
)
6739 stats
->nr_items
= BTRFS_DEV_STAT_VALUES_MAX
;
6743 int btrfs_scratch_superblock(struct btrfs_device
*device
)
6745 struct buffer_head
*bh
;
6746 struct btrfs_super_block
*disk_super
;
6748 bh
= btrfs_read_dev_super(device
->bdev
);
6751 disk_super
= (struct btrfs_super_block
*)bh
->b_data
;
6753 memset(&disk_super
->magic
, 0, sizeof(disk_super
->magic
));
6754 set_buffer_dirty(bh
);
6755 sync_dirty_buffer(bh
);
6762 * Update the size of all devices, which is used for writing out the
6765 void btrfs_update_commit_device_size(struct btrfs_fs_info
*fs_info
)
6767 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
6768 struct btrfs_device
*curr
, *next
;
6770 if (list_empty(&fs_devices
->resized_devices
))
6773 mutex_lock(&fs_devices
->device_list_mutex
);
6774 lock_chunks(fs_info
->dev_root
);
6775 list_for_each_entry_safe(curr
, next
, &fs_devices
->resized_devices
,
6777 list_del_init(&curr
->resized_list
);
6778 curr
->commit_total_bytes
= curr
->disk_total_bytes
;
6780 unlock_chunks(fs_info
->dev_root
);
6781 mutex_unlock(&fs_devices
->device_list_mutex
);
6784 /* Must be invoked during the transaction commit */
6785 void btrfs_update_commit_device_bytes_used(struct btrfs_root
*root
,
6786 struct btrfs_transaction
*transaction
)
6788 struct extent_map
*em
;
6789 struct map_lookup
*map
;
6790 struct btrfs_device
*dev
;
6793 if (list_empty(&transaction
->pending_chunks
))
6796 /* In order to kick the device replace finish process */
6798 list_for_each_entry(em
, &transaction
->pending_chunks
, list
) {
6799 map
= (struct map_lookup
*)em
->bdev
;
6801 for (i
= 0; i
< map
->num_stripes
; i
++) {
6802 dev
= map
->stripes
[i
].dev
;
6803 dev
->commit_bytes_used
= dev
->bytes_used
;
6806 unlock_chunks(root
);
6809 void btrfs_set_fs_info_ptr(struct btrfs_fs_info
*fs_info
)
6811 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
6812 while (fs_devices
) {
6813 fs_devices
->fs_info
= fs_info
;
6814 fs_devices
= fs_devices
->seed
;
6818 void btrfs_reset_fs_info_ptr(struct btrfs_fs_info
*fs_info
)
6820 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
6821 while (fs_devices
) {
6822 fs_devices
->fs_info
= NULL
;
6823 fs_devices
= fs_devices
->seed
;