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"
44 static int init_first_rw_device(struct btrfs_trans_handle
*trans
,
45 struct btrfs_root
*root
,
46 struct btrfs_device
*device
);
47 static int btrfs_relocate_sys_chunks(struct btrfs_root
*root
);
48 static void __btrfs_reset_dev_stats(struct btrfs_device
*dev
);
49 static void btrfs_dev_stat_print_on_error(struct btrfs_device
*dev
);
50 static void btrfs_dev_stat_print_on_load(struct btrfs_device
*device
);
52 static DEFINE_MUTEX(uuid_mutex
);
53 static LIST_HEAD(fs_uuids
);
55 static void lock_chunks(struct btrfs_root
*root
)
57 mutex_lock(&root
->fs_info
->chunk_mutex
);
60 static void unlock_chunks(struct btrfs_root
*root
)
62 mutex_unlock(&root
->fs_info
->chunk_mutex
);
65 static struct btrfs_fs_devices
*__alloc_fs_devices(void)
67 struct btrfs_fs_devices
*fs_devs
;
69 fs_devs
= kzalloc(sizeof(*fs_devs
), GFP_NOFS
);
71 return ERR_PTR(-ENOMEM
);
73 mutex_init(&fs_devs
->device_list_mutex
);
75 INIT_LIST_HEAD(&fs_devs
->devices
);
76 INIT_LIST_HEAD(&fs_devs
->alloc_list
);
77 INIT_LIST_HEAD(&fs_devs
->list
);
83 * alloc_fs_devices - allocate struct btrfs_fs_devices
84 * @fsid: a pointer to UUID for this FS. If NULL a new UUID is
87 * Return: a pointer to a new &struct btrfs_fs_devices on success;
88 * ERR_PTR() on error. Returned struct is not linked onto any lists and
89 * can be destroyed with kfree() right away.
91 static struct btrfs_fs_devices
*alloc_fs_devices(const u8
*fsid
)
93 struct btrfs_fs_devices
*fs_devs
;
95 fs_devs
= __alloc_fs_devices();
100 memcpy(fs_devs
->fsid
, fsid
, BTRFS_FSID_SIZE
);
102 generate_random_uuid(fs_devs
->fsid
);
107 static void free_fs_devices(struct btrfs_fs_devices
*fs_devices
)
109 struct btrfs_device
*device
;
110 WARN_ON(fs_devices
->opened
);
111 while (!list_empty(&fs_devices
->devices
)) {
112 device
= list_entry(fs_devices
->devices
.next
,
113 struct btrfs_device
, dev_list
);
114 list_del(&device
->dev_list
);
115 rcu_string_free(device
->name
);
121 static void btrfs_kobject_uevent(struct block_device
*bdev
,
122 enum kobject_action action
)
126 ret
= kobject_uevent(&disk_to_dev(bdev
->bd_disk
)->kobj
, action
);
128 pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n",
130 kobject_name(&disk_to_dev(bdev
->bd_disk
)->kobj
),
131 &disk_to_dev(bdev
->bd_disk
)->kobj
);
134 void btrfs_cleanup_fs_uuids(void)
136 struct btrfs_fs_devices
*fs_devices
;
138 while (!list_empty(&fs_uuids
)) {
139 fs_devices
= list_entry(fs_uuids
.next
,
140 struct btrfs_fs_devices
, list
);
141 list_del(&fs_devices
->list
);
142 free_fs_devices(fs_devices
);
146 static struct btrfs_device
*__alloc_device(void)
148 struct btrfs_device
*dev
;
150 dev
= kzalloc(sizeof(*dev
), GFP_NOFS
);
152 return ERR_PTR(-ENOMEM
);
154 INIT_LIST_HEAD(&dev
->dev_list
);
155 INIT_LIST_HEAD(&dev
->dev_alloc_list
);
157 spin_lock_init(&dev
->io_lock
);
159 spin_lock_init(&dev
->reada_lock
);
160 atomic_set(&dev
->reada_in_flight
, 0);
161 INIT_RADIX_TREE(&dev
->reada_zones
, GFP_NOFS
& ~__GFP_WAIT
);
162 INIT_RADIX_TREE(&dev
->reada_extents
, GFP_NOFS
& ~__GFP_WAIT
);
167 static noinline
struct btrfs_device
*__find_device(struct list_head
*head
,
170 struct btrfs_device
*dev
;
172 list_for_each_entry(dev
, head
, dev_list
) {
173 if (dev
->devid
== devid
&&
174 (!uuid
|| !memcmp(dev
->uuid
, uuid
, BTRFS_UUID_SIZE
))) {
181 static noinline
struct btrfs_fs_devices
*find_fsid(u8
*fsid
)
183 struct btrfs_fs_devices
*fs_devices
;
185 list_for_each_entry(fs_devices
, &fs_uuids
, list
) {
186 if (memcmp(fsid
, fs_devices
->fsid
, BTRFS_FSID_SIZE
) == 0)
193 btrfs_get_bdev_and_sb(const char *device_path
, fmode_t flags
, void *holder
,
194 int flush
, struct block_device
**bdev
,
195 struct buffer_head
**bh
)
199 *bdev
= blkdev_get_by_path(device_path
, flags
, holder
);
202 ret
= PTR_ERR(*bdev
);
203 printk(KERN_INFO
"BTRFS: open %s failed\n", device_path
);
208 filemap_write_and_wait((*bdev
)->bd_inode
->i_mapping
);
209 ret
= set_blocksize(*bdev
, 4096);
211 blkdev_put(*bdev
, flags
);
214 invalidate_bdev(*bdev
);
215 *bh
= btrfs_read_dev_super(*bdev
);
218 blkdev_put(*bdev
, flags
);
230 static void requeue_list(struct btrfs_pending_bios
*pending_bios
,
231 struct bio
*head
, struct bio
*tail
)
234 struct bio
*old_head
;
236 old_head
= pending_bios
->head
;
237 pending_bios
->head
= head
;
238 if (pending_bios
->tail
)
239 tail
->bi_next
= old_head
;
241 pending_bios
->tail
= tail
;
245 * we try to collect pending bios for a device so we don't get a large
246 * number of procs sending bios down to the same device. This greatly
247 * improves the schedulers ability to collect and merge the bios.
249 * But, it also turns into a long list of bios to process and that is sure
250 * to eventually make the worker thread block. The solution here is to
251 * make some progress and then put this work struct back at the end of
252 * the list if the block device is congested. This way, multiple devices
253 * can make progress from a single worker thread.
255 static noinline
void run_scheduled_bios(struct btrfs_device
*device
)
258 struct backing_dev_info
*bdi
;
259 struct btrfs_fs_info
*fs_info
;
260 struct btrfs_pending_bios
*pending_bios
;
264 unsigned long num_run
;
265 unsigned long batch_run
= 0;
267 unsigned long last_waited
= 0;
269 int sync_pending
= 0;
270 struct blk_plug plug
;
273 * this function runs all the bios we've collected for
274 * a particular device. We don't want to wander off to
275 * another device without first sending all of these down.
276 * So, setup a plug here and finish it off before we return
278 blk_start_plug(&plug
);
280 bdi
= blk_get_backing_dev_info(device
->bdev
);
281 fs_info
= device
->dev_root
->fs_info
;
282 limit
= btrfs_async_submit_limit(fs_info
);
283 limit
= limit
* 2 / 3;
286 spin_lock(&device
->io_lock
);
291 /* take all the bios off the list at once and process them
292 * later on (without the lock held). But, remember the
293 * tail and other pointers so the bios can be properly reinserted
294 * into the list if we hit congestion
296 if (!force_reg
&& device
->pending_sync_bios
.head
) {
297 pending_bios
= &device
->pending_sync_bios
;
300 pending_bios
= &device
->pending_bios
;
304 pending
= pending_bios
->head
;
305 tail
= pending_bios
->tail
;
306 WARN_ON(pending
&& !tail
);
309 * if pending was null this time around, no bios need processing
310 * at all and we can stop. Otherwise it'll loop back up again
311 * and do an additional check so no bios are missed.
313 * device->running_pending is used to synchronize with the
316 if (device
->pending_sync_bios
.head
== NULL
&&
317 device
->pending_bios
.head
== NULL
) {
319 device
->running_pending
= 0;
322 device
->running_pending
= 1;
325 pending_bios
->head
= NULL
;
326 pending_bios
->tail
= NULL
;
328 spin_unlock(&device
->io_lock
);
333 /* we want to work on both lists, but do more bios on the
334 * sync list than the regular list
337 pending_bios
!= &device
->pending_sync_bios
&&
338 device
->pending_sync_bios
.head
) ||
339 (num_run
> 64 && pending_bios
== &device
->pending_sync_bios
&&
340 device
->pending_bios
.head
)) {
341 spin_lock(&device
->io_lock
);
342 requeue_list(pending_bios
, pending
, tail
);
347 pending
= pending
->bi_next
;
350 if (atomic_dec_return(&fs_info
->nr_async_bios
) < limit
&&
351 waitqueue_active(&fs_info
->async_submit_wait
))
352 wake_up(&fs_info
->async_submit_wait
);
354 BUG_ON(atomic_read(&cur
->bi_cnt
) == 0);
357 * if we're doing the sync list, record that our
358 * plug has some sync requests on it
360 * If we're doing the regular list and there are
361 * sync requests sitting around, unplug before
364 if (pending_bios
== &device
->pending_sync_bios
) {
366 } else if (sync_pending
) {
367 blk_finish_plug(&plug
);
368 blk_start_plug(&plug
);
372 btrfsic_submit_bio(cur
->bi_rw
, cur
);
379 * we made progress, there is more work to do and the bdi
380 * is now congested. Back off and let other work structs
383 if (pending
&& bdi_write_congested(bdi
) && batch_run
> 8 &&
384 fs_info
->fs_devices
->open_devices
> 1) {
385 struct io_context
*ioc
;
387 ioc
= current
->io_context
;
390 * the main goal here is that we don't want to
391 * block if we're going to be able to submit
392 * more requests without blocking.
394 * This code does two great things, it pokes into
395 * the elevator code from a filesystem _and_
396 * it makes assumptions about how batching works.
398 if (ioc
&& ioc
->nr_batch_requests
> 0 &&
399 time_before(jiffies
, ioc
->last_waited
+ HZ
/50UL) &&
401 ioc
->last_waited
== last_waited
)) {
403 * we want to go through our batch of
404 * requests and stop. So, we copy out
405 * the ioc->last_waited time and test
406 * against it before looping
408 last_waited
= ioc
->last_waited
;
413 spin_lock(&device
->io_lock
);
414 requeue_list(pending_bios
, pending
, tail
);
415 device
->running_pending
= 1;
417 spin_unlock(&device
->io_lock
);
418 btrfs_queue_work(fs_info
->submit_workers
,
422 /* unplug every 64 requests just for good measure */
423 if (batch_run
% 64 == 0) {
424 blk_finish_plug(&plug
);
425 blk_start_plug(&plug
);
434 spin_lock(&device
->io_lock
);
435 if (device
->pending_bios
.head
|| device
->pending_sync_bios
.head
)
437 spin_unlock(&device
->io_lock
);
440 blk_finish_plug(&plug
);
443 static void pending_bios_fn(struct btrfs_work
*work
)
445 struct btrfs_device
*device
;
447 device
= container_of(work
, struct btrfs_device
, work
);
448 run_scheduled_bios(device
);
452 * Add new device to list of registered devices
455 * 1 - first time device is seen
456 * 0 - device already known
459 static noinline
int device_list_add(const char *path
,
460 struct btrfs_super_block
*disk_super
,
461 u64 devid
, struct btrfs_fs_devices
**fs_devices_ret
)
463 struct btrfs_device
*device
;
464 struct btrfs_fs_devices
*fs_devices
;
465 struct rcu_string
*name
;
467 u64 found_transid
= btrfs_super_generation(disk_super
);
469 fs_devices
= find_fsid(disk_super
->fsid
);
471 fs_devices
= alloc_fs_devices(disk_super
->fsid
);
472 if (IS_ERR(fs_devices
))
473 return PTR_ERR(fs_devices
);
475 list_add(&fs_devices
->list
, &fs_uuids
);
476 fs_devices
->latest_devid
= devid
;
477 fs_devices
->latest_trans
= found_transid
;
481 device
= __find_device(&fs_devices
->devices
, devid
,
482 disk_super
->dev_item
.uuid
);
485 if (fs_devices
->opened
)
488 device
= btrfs_alloc_device(NULL
, &devid
,
489 disk_super
->dev_item
.uuid
);
490 if (IS_ERR(device
)) {
491 /* we can safely leave the fs_devices entry around */
492 return PTR_ERR(device
);
495 name
= rcu_string_strdup(path
, GFP_NOFS
);
500 rcu_assign_pointer(device
->name
, name
);
502 mutex_lock(&fs_devices
->device_list_mutex
);
503 list_add_rcu(&device
->dev_list
, &fs_devices
->devices
);
504 fs_devices
->num_devices
++;
505 mutex_unlock(&fs_devices
->device_list_mutex
);
508 device
->fs_devices
= fs_devices
;
509 } else if (!device
->name
|| strcmp(device
->name
->str
, path
)) {
510 name
= rcu_string_strdup(path
, GFP_NOFS
);
513 rcu_string_free(device
->name
);
514 rcu_assign_pointer(device
->name
, name
);
515 if (device
->missing
) {
516 fs_devices
->missing_devices
--;
521 if (found_transid
> fs_devices
->latest_trans
) {
522 fs_devices
->latest_devid
= devid
;
523 fs_devices
->latest_trans
= found_transid
;
525 *fs_devices_ret
= fs_devices
;
530 static struct btrfs_fs_devices
*clone_fs_devices(struct btrfs_fs_devices
*orig
)
532 struct btrfs_fs_devices
*fs_devices
;
533 struct btrfs_device
*device
;
534 struct btrfs_device
*orig_dev
;
536 fs_devices
= alloc_fs_devices(orig
->fsid
);
537 if (IS_ERR(fs_devices
))
540 fs_devices
->latest_devid
= orig
->latest_devid
;
541 fs_devices
->latest_trans
= orig
->latest_trans
;
542 fs_devices
->total_devices
= orig
->total_devices
;
544 /* We have held the volume lock, it is safe to get the devices. */
545 list_for_each_entry(orig_dev
, &orig
->devices
, dev_list
) {
546 struct rcu_string
*name
;
548 device
= btrfs_alloc_device(NULL
, &orig_dev
->devid
,
554 * This is ok to do without rcu read locked because we hold the
555 * uuid mutex so nothing we touch in here is going to disappear.
557 name
= rcu_string_strdup(orig_dev
->name
->str
, GFP_NOFS
);
562 rcu_assign_pointer(device
->name
, name
);
564 list_add(&device
->dev_list
, &fs_devices
->devices
);
565 device
->fs_devices
= fs_devices
;
566 fs_devices
->num_devices
++;
570 free_fs_devices(fs_devices
);
571 return ERR_PTR(-ENOMEM
);
574 void btrfs_close_extra_devices(struct btrfs_fs_info
*fs_info
,
575 struct btrfs_fs_devices
*fs_devices
, int step
)
577 struct btrfs_device
*device
, *next
;
579 struct block_device
*latest_bdev
= NULL
;
580 u64 latest_devid
= 0;
581 u64 latest_transid
= 0;
583 mutex_lock(&uuid_mutex
);
585 /* This is the initialized path, it is safe to release the devices. */
586 list_for_each_entry_safe(device
, next
, &fs_devices
->devices
, dev_list
) {
587 if (device
->in_fs_metadata
) {
588 if (!device
->is_tgtdev_for_dev_replace
&&
590 device
->generation
> latest_transid
)) {
591 latest_devid
= device
->devid
;
592 latest_transid
= device
->generation
;
593 latest_bdev
= device
->bdev
;
598 if (device
->devid
== BTRFS_DEV_REPLACE_DEVID
) {
600 * In the first step, keep the device which has
601 * the correct fsid and the devid that is used
602 * for the dev_replace procedure.
603 * In the second step, the dev_replace state is
604 * read from the device tree and it is known
605 * whether the procedure is really active or
606 * not, which means whether this device is
607 * used or whether it should be removed.
609 if (step
== 0 || device
->is_tgtdev_for_dev_replace
) {
614 blkdev_put(device
->bdev
, device
->mode
);
616 fs_devices
->open_devices
--;
618 if (device
->writeable
) {
619 list_del_init(&device
->dev_alloc_list
);
620 device
->writeable
= 0;
621 if (!device
->is_tgtdev_for_dev_replace
)
622 fs_devices
->rw_devices
--;
624 list_del_init(&device
->dev_list
);
625 fs_devices
->num_devices
--;
626 rcu_string_free(device
->name
);
630 if (fs_devices
->seed
) {
631 fs_devices
= fs_devices
->seed
;
635 fs_devices
->latest_bdev
= latest_bdev
;
636 fs_devices
->latest_devid
= latest_devid
;
637 fs_devices
->latest_trans
= latest_transid
;
639 mutex_unlock(&uuid_mutex
);
642 static void __free_device(struct work_struct
*work
)
644 struct btrfs_device
*device
;
646 device
= container_of(work
, struct btrfs_device
, rcu_work
);
649 blkdev_put(device
->bdev
, device
->mode
);
651 rcu_string_free(device
->name
);
655 static void free_device(struct rcu_head
*head
)
657 struct btrfs_device
*device
;
659 device
= container_of(head
, struct btrfs_device
, rcu
);
661 INIT_WORK(&device
->rcu_work
, __free_device
);
662 schedule_work(&device
->rcu_work
);
665 static int __btrfs_close_devices(struct btrfs_fs_devices
*fs_devices
)
667 struct btrfs_device
*device
;
669 if (--fs_devices
->opened
> 0)
672 mutex_lock(&fs_devices
->device_list_mutex
);
673 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
) {
674 struct btrfs_device
*new_device
;
675 struct rcu_string
*name
;
678 fs_devices
->open_devices
--;
680 if (device
->writeable
&&
681 device
->devid
!= BTRFS_DEV_REPLACE_DEVID
) {
682 list_del_init(&device
->dev_alloc_list
);
683 fs_devices
->rw_devices
--;
686 if (device
->can_discard
)
687 fs_devices
->num_can_discard
--;
689 fs_devices
->missing_devices
--;
691 new_device
= btrfs_alloc_device(NULL
, &device
->devid
,
693 BUG_ON(IS_ERR(new_device
)); /* -ENOMEM */
695 /* Safe because we are under uuid_mutex */
697 name
= rcu_string_strdup(device
->name
->str
, GFP_NOFS
);
698 BUG_ON(!name
); /* -ENOMEM */
699 rcu_assign_pointer(new_device
->name
, name
);
702 list_replace_rcu(&device
->dev_list
, &new_device
->dev_list
);
703 new_device
->fs_devices
= device
->fs_devices
;
705 call_rcu(&device
->rcu
, free_device
);
707 mutex_unlock(&fs_devices
->device_list_mutex
);
709 WARN_ON(fs_devices
->open_devices
);
710 WARN_ON(fs_devices
->rw_devices
);
711 fs_devices
->opened
= 0;
712 fs_devices
->seeding
= 0;
717 int btrfs_close_devices(struct btrfs_fs_devices
*fs_devices
)
719 struct btrfs_fs_devices
*seed_devices
= NULL
;
722 mutex_lock(&uuid_mutex
);
723 ret
= __btrfs_close_devices(fs_devices
);
724 if (!fs_devices
->opened
) {
725 seed_devices
= fs_devices
->seed
;
726 fs_devices
->seed
= NULL
;
728 mutex_unlock(&uuid_mutex
);
730 while (seed_devices
) {
731 fs_devices
= seed_devices
;
732 seed_devices
= fs_devices
->seed
;
733 __btrfs_close_devices(fs_devices
);
734 free_fs_devices(fs_devices
);
737 * Wait for rcu kworkers under __btrfs_close_devices
738 * to finish all blkdev_puts so device is really
739 * free when umount is done.
745 static int __btrfs_open_devices(struct btrfs_fs_devices
*fs_devices
,
746 fmode_t flags
, void *holder
)
748 struct request_queue
*q
;
749 struct block_device
*bdev
;
750 struct list_head
*head
= &fs_devices
->devices
;
751 struct btrfs_device
*device
;
752 struct block_device
*latest_bdev
= NULL
;
753 struct buffer_head
*bh
;
754 struct btrfs_super_block
*disk_super
;
755 u64 latest_devid
= 0;
756 u64 latest_transid
= 0;
763 list_for_each_entry(device
, head
, dev_list
) {
769 /* Just open everything we can; ignore failures here */
770 if (btrfs_get_bdev_and_sb(device
->name
->str
, flags
, holder
, 1,
774 disk_super
= (struct btrfs_super_block
*)bh
->b_data
;
775 devid
= btrfs_stack_device_id(&disk_super
->dev_item
);
776 if (devid
!= device
->devid
)
779 if (memcmp(device
->uuid
, disk_super
->dev_item
.uuid
,
783 device
->generation
= btrfs_super_generation(disk_super
);
784 if (!latest_transid
|| device
->generation
> latest_transid
) {
785 latest_devid
= devid
;
786 latest_transid
= device
->generation
;
790 if (btrfs_super_flags(disk_super
) & BTRFS_SUPER_FLAG_SEEDING
) {
791 device
->writeable
= 0;
793 device
->writeable
= !bdev_read_only(bdev
);
797 q
= bdev_get_queue(bdev
);
798 if (blk_queue_discard(q
)) {
799 device
->can_discard
= 1;
800 fs_devices
->num_can_discard
++;
804 device
->in_fs_metadata
= 0;
805 device
->mode
= flags
;
807 if (!blk_queue_nonrot(bdev_get_queue(bdev
)))
808 fs_devices
->rotating
= 1;
810 fs_devices
->open_devices
++;
811 if (device
->writeable
&&
812 device
->devid
!= BTRFS_DEV_REPLACE_DEVID
) {
813 fs_devices
->rw_devices
++;
814 list_add(&device
->dev_alloc_list
,
815 &fs_devices
->alloc_list
);
822 blkdev_put(bdev
, flags
);
825 if (fs_devices
->open_devices
== 0) {
829 fs_devices
->seeding
= seeding
;
830 fs_devices
->opened
= 1;
831 fs_devices
->latest_bdev
= latest_bdev
;
832 fs_devices
->latest_devid
= latest_devid
;
833 fs_devices
->latest_trans
= latest_transid
;
834 fs_devices
->total_rw_bytes
= 0;
839 int btrfs_open_devices(struct btrfs_fs_devices
*fs_devices
,
840 fmode_t flags
, void *holder
)
844 mutex_lock(&uuid_mutex
);
845 if (fs_devices
->opened
) {
846 fs_devices
->opened
++;
849 ret
= __btrfs_open_devices(fs_devices
, flags
, holder
);
851 mutex_unlock(&uuid_mutex
);
856 * Look for a btrfs signature on a device. This may be called out of the mount path
857 * and we are not allowed to call set_blocksize during the scan. The superblock
858 * is read via pagecache
860 int btrfs_scan_one_device(const char *path
, fmode_t flags
, void *holder
,
861 struct btrfs_fs_devices
**fs_devices_ret
)
863 struct btrfs_super_block
*disk_super
;
864 struct block_device
*bdev
;
875 * we would like to check all the supers, but that would make
876 * a btrfs mount succeed after a mkfs from a different FS.
877 * So, we need to add a special mount option to scan for
878 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
880 bytenr
= btrfs_sb_offset(0);
882 mutex_lock(&uuid_mutex
);
884 bdev
= blkdev_get_by_path(path
, flags
, holder
);
891 /* make sure our super fits in the device */
892 if (bytenr
+ PAGE_CACHE_SIZE
>= i_size_read(bdev
->bd_inode
))
895 /* make sure our super fits in the page */
896 if (sizeof(*disk_super
) > PAGE_CACHE_SIZE
)
899 /* make sure our super doesn't straddle pages on disk */
900 index
= bytenr
>> PAGE_CACHE_SHIFT
;
901 if ((bytenr
+ sizeof(*disk_super
) - 1) >> PAGE_CACHE_SHIFT
!= index
)
904 /* pull in the page with our super */
905 page
= read_cache_page_gfp(bdev
->bd_inode
->i_mapping
,
908 if (IS_ERR_OR_NULL(page
))
913 /* align our pointer to the offset of the super block */
914 disk_super
= p
+ (bytenr
& ~PAGE_CACHE_MASK
);
916 if (btrfs_super_bytenr(disk_super
) != bytenr
||
917 btrfs_super_magic(disk_super
) != BTRFS_MAGIC
)
920 devid
= btrfs_stack_device_id(&disk_super
->dev_item
);
921 transid
= btrfs_super_generation(disk_super
);
922 total_devices
= btrfs_super_num_devices(disk_super
);
924 ret
= device_list_add(path
, disk_super
, devid
, fs_devices_ret
);
926 if (disk_super
->label
[0]) {
927 if (disk_super
->label
[BTRFS_LABEL_SIZE
- 1])
928 disk_super
->label
[BTRFS_LABEL_SIZE
- 1] = '\0';
929 printk(KERN_INFO
"BTRFS: device label %s ", disk_super
->label
);
931 printk(KERN_INFO
"BTRFS: device fsid %pU ", disk_super
->fsid
);
934 printk(KERN_CONT
"devid %llu transid %llu %s\n", devid
, transid
, path
);
937 if (!ret
&& fs_devices_ret
)
938 (*fs_devices_ret
)->total_devices
= total_devices
;
942 page_cache_release(page
);
945 blkdev_put(bdev
, flags
);
947 mutex_unlock(&uuid_mutex
);
951 /* helper to account the used device space in the range */
952 int btrfs_account_dev_extents_size(struct btrfs_device
*device
, u64 start
,
953 u64 end
, u64
*length
)
955 struct btrfs_key key
;
956 struct btrfs_root
*root
= device
->dev_root
;
957 struct btrfs_dev_extent
*dev_extent
;
958 struct btrfs_path
*path
;
962 struct extent_buffer
*l
;
966 if (start
>= device
->total_bytes
|| device
->is_tgtdev_for_dev_replace
)
969 path
= btrfs_alloc_path();
974 key
.objectid
= device
->devid
;
976 key
.type
= BTRFS_DEV_EXTENT_KEY
;
978 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
982 ret
= btrfs_previous_item(root
, path
, key
.objectid
, key
.type
);
989 slot
= path
->slots
[0];
990 if (slot
>= btrfs_header_nritems(l
)) {
991 ret
= btrfs_next_leaf(root
, path
);
999 btrfs_item_key_to_cpu(l
, &key
, slot
);
1001 if (key
.objectid
< device
->devid
)
1004 if (key
.objectid
> device
->devid
)
1007 if (btrfs_key_type(&key
) != BTRFS_DEV_EXTENT_KEY
)
1010 dev_extent
= btrfs_item_ptr(l
, slot
, struct btrfs_dev_extent
);
1011 extent_end
= key
.offset
+ btrfs_dev_extent_length(l
,
1013 if (key
.offset
<= start
&& extent_end
> end
) {
1014 *length
= end
- start
+ 1;
1016 } else if (key
.offset
<= start
&& extent_end
> start
)
1017 *length
+= extent_end
- start
;
1018 else if (key
.offset
> start
&& extent_end
<= end
)
1019 *length
+= extent_end
- key
.offset
;
1020 else if (key
.offset
> start
&& key
.offset
<= end
) {
1021 *length
+= end
- key
.offset
+ 1;
1023 } else if (key
.offset
> end
)
1031 btrfs_free_path(path
);
1035 static int contains_pending_extent(struct btrfs_trans_handle
*trans
,
1036 struct btrfs_device
*device
,
1037 u64
*start
, u64 len
)
1039 struct extent_map
*em
;
1042 list_for_each_entry(em
, &trans
->transaction
->pending_chunks
, list
) {
1043 struct map_lookup
*map
;
1046 map
= (struct map_lookup
*)em
->bdev
;
1047 for (i
= 0; i
< map
->num_stripes
; i
++) {
1048 if (map
->stripes
[i
].dev
!= device
)
1050 if (map
->stripes
[i
].physical
>= *start
+ len
||
1051 map
->stripes
[i
].physical
+ em
->orig_block_len
<=
1054 *start
= map
->stripes
[i
].physical
+
1065 * find_free_dev_extent - find free space in the specified device
1066 * @device: the device which we search the free space in
1067 * @num_bytes: the size of the free space that we need
1068 * @start: store the start of the free space.
1069 * @len: the size of the free space. that we find, or the size of the max
1070 * free space if we don't find suitable free space
1072 * this uses a pretty simple search, the expectation is that it is
1073 * called very infrequently and that a given device has a small number
1076 * @start is used to store the start of the free space if we find. But if we
1077 * don't find suitable free space, it will be used to store the start position
1078 * of the max free space.
1080 * @len is used to store the size of the free space that we find.
1081 * But if we don't find suitable free space, it is used to store the size of
1082 * the max free space.
1084 int find_free_dev_extent(struct btrfs_trans_handle
*trans
,
1085 struct btrfs_device
*device
, u64 num_bytes
,
1086 u64
*start
, u64
*len
)
1088 struct btrfs_key key
;
1089 struct btrfs_root
*root
= device
->dev_root
;
1090 struct btrfs_dev_extent
*dev_extent
;
1091 struct btrfs_path
*path
;
1097 u64 search_end
= device
->total_bytes
;
1100 struct extent_buffer
*l
;
1102 /* FIXME use last free of some kind */
1104 /* we don't want to overwrite the superblock on the drive,
1105 * so we make sure to start at an offset of at least 1MB
1107 search_start
= max(root
->fs_info
->alloc_start
, 1024ull * 1024);
1109 path
= btrfs_alloc_path();
1113 max_hole_start
= search_start
;
1117 if (search_start
>= search_end
|| device
->is_tgtdev_for_dev_replace
) {
1123 path
->search_commit_root
= 1;
1124 path
->skip_locking
= 1;
1126 key
.objectid
= device
->devid
;
1127 key
.offset
= search_start
;
1128 key
.type
= BTRFS_DEV_EXTENT_KEY
;
1130 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1134 ret
= btrfs_previous_item(root
, path
, key
.objectid
, key
.type
);
1141 slot
= path
->slots
[0];
1142 if (slot
>= btrfs_header_nritems(l
)) {
1143 ret
= btrfs_next_leaf(root
, path
);
1151 btrfs_item_key_to_cpu(l
, &key
, slot
);
1153 if (key
.objectid
< device
->devid
)
1156 if (key
.objectid
> device
->devid
)
1159 if (btrfs_key_type(&key
) != BTRFS_DEV_EXTENT_KEY
)
1162 if (key
.offset
> search_start
) {
1163 hole_size
= key
.offset
- search_start
;
1166 * Have to check before we set max_hole_start, otherwise
1167 * we could end up sending back this offset anyway.
1169 if (contains_pending_extent(trans
, device
,
1174 if (hole_size
> max_hole_size
) {
1175 max_hole_start
= search_start
;
1176 max_hole_size
= hole_size
;
1180 * If this free space is greater than which we need,
1181 * it must be the max free space that we have found
1182 * until now, so max_hole_start must point to the start
1183 * of this free space and the length of this free space
1184 * is stored in max_hole_size. Thus, we return
1185 * max_hole_start and max_hole_size and go back to the
1188 if (hole_size
>= num_bytes
) {
1194 dev_extent
= btrfs_item_ptr(l
, slot
, struct btrfs_dev_extent
);
1195 extent_end
= key
.offset
+ btrfs_dev_extent_length(l
,
1197 if (extent_end
> search_start
)
1198 search_start
= extent_end
;
1205 * At this point, search_start should be the end of
1206 * allocated dev extents, and when shrinking the device,
1207 * search_end may be smaller than search_start.
1209 if (search_end
> search_start
)
1210 hole_size
= search_end
- search_start
;
1212 if (hole_size
> max_hole_size
) {
1213 max_hole_start
= search_start
;
1214 max_hole_size
= hole_size
;
1217 if (contains_pending_extent(trans
, device
, &search_start
, hole_size
)) {
1218 btrfs_release_path(path
);
1223 if (hole_size
< num_bytes
)
1229 btrfs_free_path(path
);
1230 *start
= max_hole_start
;
1232 *len
= max_hole_size
;
1236 static int btrfs_free_dev_extent(struct btrfs_trans_handle
*trans
,
1237 struct btrfs_device
*device
,
1241 struct btrfs_path
*path
;
1242 struct btrfs_root
*root
= device
->dev_root
;
1243 struct btrfs_key key
;
1244 struct btrfs_key found_key
;
1245 struct extent_buffer
*leaf
= NULL
;
1246 struct btrfs_dev_extent
*extent
= NULL
;
1248 path
= btrfs_alloc_path();
1252 key
.objectid
= device
->devid
;
1254 key
.type
= BTRFS_DEV_EXTENT_KEY
;
1256 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1258 ret
= btrfs_previous_item(root
, path
, key
.objectid
,
1259 BTRFS_DEV_EXTENT_KEY
);
1262 leaf
= path
->nodes
[0];
1263 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1264 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
1265 struct btrfs_dev_extent
);
1266 BUG_ON(found_key
.offset
> start
|| found_key
.offset
+
1267 btrfs_dev_extent_length(leaf
, extent
) < start
);
1269 btrfs_release_path(path
);
1271 } else if (ret
== 0) {
1272 leaf
= path
->nodes
[0];
1273 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
1274 struct btrfs_dev_extent
);
1276 btrfs_error(root
->fs_info
, ret
, "Slot search failed");
1280 if (device
->bytes_used
> 0) {
1281 u64 len
= btrfs_dev_extent_length(leaf
, extent
);
1282 device
->bytes_used
-= len
;
1283 spin_lock(&root
->fs_info
->free_chunk_lock
);
1284 root
->fs_info
->free_chunk_space
+= len
;
1285 spin_unlock(&root
->fs_info
->free_chunk_lock
);
1287 ret
= btrfs_del_item(trans
, root
, path
);
1289 btrfs_error(root
->fs_info
, ret
,
1290 "Failed to remove dev extent item");
1293 btrfs_free_path(path
);
1297 static int btrfs_alloc_dev_extent(struct btrfs_trans_handle
*trans
,
1298 struct btrfs_device
*device
,
1299 u64 chunk_tree
, u64 chunk_objectid
,
1300 u64 chunk_offset
, u64 start
, u64 num_bytes
)
1303 struct btrfs_path
*path
;
1304 struct btrfs_root
*root
= device
->dev_root
;
1305 struct btrfs_dev_extent
*extent
;
1306 struct extent_buffer
*leaf
;
1307 struct btrfs_key key
;
1309 WARN_ON(!device
->in_fs_metadata
);
1310 WARN_ON(device
->is_tgtdev_for_dev_replace
);
1311 path
= btrfs_alloc_path();
1315 key
.objectid
= device
->devid
;
1317 key
.type
= BTRFS_DEV_EXTENT_KEY
;
1318 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
1323 leaf
= path
->nodes
[0];
1324 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
1325 struct btrfs_dev_extent
);
1326 btrfs_set_dev_extent_chunk_tree(leaf
, extent
, chunk_tree
);
1327 btrfs_set_dev_extent_chunk_objectid(leaf
, extent
, chunk_objectid
);
1328 btrfs_set_dev_extent_chunk_offset(leaf
, extent
, chunk_offset
);
1330 write_extent_buffer(leaf
, root
->fs_info
->chunk_tree_uuid
,
1331 btrfs_dev_extent_chunk_tree_uuid(extent
), BTRFS_UUID_SIZE
);
1333 btrfs_set_dev_extent_length(leaf
, extent
, num_bytes
);
1334 btrfs_mark_buffer_dirty(leaf
);
1336 btrfs_free_path(path
);
1340 static u64
find_next_chunk(struct btrfs_fs_info
*fs_info
)
1342 struct extent_map_tree
*em_tree
;
1343 struct extent_map
*em
;
1347 em_tree
= &fs_info
->mapping_tree
.map_tree
;
1348 read_lock(&em_tree
->lock
);
1349 n
= rb_last(&em_tree
->map
);
1351 em
= rb_entry(n
, struct extent_map
, rb_node
);
1352 ret
= em
->start
+ em
->len
;
1354 read_unlock(&em_tree
->lock
);
1359 static noinline
int find_next_devid(struct btrfs_fs_info
*fs_info
,
1363 struct btrfs_key key
;
1364 struct btrfs_key found_key
;
1365 struct btrfs_path
*path
;
1367 path
= btrfs_alloc_path();
1371 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
1372 key
.type
= BTRFS_DEV_ITEM_KEY
;
1373 key
.offset
= (u64
)-1;
1375 ret
= btrfs_search_slot(NULL
, fs_info
->chunk_root
, &key
, path
, 0, 0);
1379 BUG_ON(ret
== 0); /* Corruption */
1381 ret
= btrfs_previous_item(fs_info
->chunk_root
, path
,
1382 BTRFS_DEV_ITEMS_OBJECTID
,
1383 BTRFS_DEV_ITEM_KEY
);
1387 btrfs_item_key_to_cpu(path
->nodes
[0], &found_key
,
1389 *devid_ret
= found_key
.offset
+ 1;
1393 btrfs_free_path(path
);
1398 * the device information is stored in the chunk root
1399 * the btrfs_device struct should be fully filled in
1401 static int btrfs_add_device(struct btrfs_trans_handle
*trans
,
1402 struct btrfs_root
*root
,
1403 struct btrfs_device
*device
)
1406 struct btrfs_path
*path
;
1407 struct btrfs_dev_item
*dev_item
;
1408 struct extent_buffer
*leaf
;
1409 struct btrfs_key key
;
1412 root
= root
->fs_info
->chunk_root
;
1414 path
= btrfs_alloc_path();
1418 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
1419 key
.type
= BTRFS_DEV_ITEM_KEY
;
1420 key
.offset
= device
->devid
;
1422 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
1427 leaf
= path
->nodes
[0];
1428 dev_item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_dev_item
);
1430 btrfs_set_device_id(leaf
, dev_item
, device
->devid
);
1431 btrfs_set_device_generation(leaf
, dev_item
, 0);
1432 btrfs_set_device_type(leaf
, dev_item
, device
->type
);
1433 btrfs_set_device_io_align(leaf
, dev_item
, device
->io_align
);
1434 btrfs_set_device_io_width(leaf
, dev_item
, device
->io_width
);
1435 btrfs_set_device_sector_size(leaf
, dev_item
, device
->sector_size
);
1436 btrfs_set_device_total_bytes(leaf
, dev_item
, device
->total_bytes
);
1437 btrfs_set_device_bytes_used(leaf
, dev_item
, device
->bytes_used
);
1438 btrfs_set_device_group(leaf
, dev_item
, 0);
1439 btrfs_set_device_seek_speed(leaf
, dev_item
, 0);
1440 btrfs_set_device_bandwidth(leaf
, dev_item
, 0);
1441 btrfs_set_device_start_offset(leaf
, dev_item
, 0);
1443 ptr
= btrfs_device_uuid(dev_item
);
1444 write_extent_buffer(leaf
, device
->uuid
, ptr
, BTRFS_UUID_SIZE
);
1445 ptr
= btrfs_device_fsid(dev_item
);
1446 write_extent_buffer(leaf
, root
->fs_info
->fsid
, ptr
, BTRFS_UUID_SIZE
);
1447 btrfs_mark_buffer_dirty(leaf
);
1451 btrfs_free_path(path
);
1456 * Function to update ctime/mtime for a given device path.
1457 * Mainly used for ctime/mtime based probe like libblkid.
1459 static void update_dev_time(char *path_name
)
1463 filp
= filp_open(path_name
, O_RDWR
, 0);
1466 file_update_time(filp
);
1467 filp_close(filp
, NULL
);
1471 static int btrfs_rm_dev_item(struct btrfs_root
*root
,
1472 struct btrfs_device
*device
)
1475 struct btrfs_path
*path
;
1476 struct btrfs_key key
;
1477 struct btrfs_trans_handle
*trans
;
1479 root
= root
->fs_info
->chunk_root
;
1481 path
= btrfs_alloc_path();
1485 trans
= btrfs_start_transaction(root
, 0);
1486 if (IS_ERR(trans
)) {
1487 btrfs_free_path(path
);
1488 return PTR_ERR(trans
);
1490 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
1491 key
.type
= BTRFS_DEV_ITEM_KEY
;
1492 key
.offset
= device
->devid
;
1495 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1504 ret
= btrfs_del_item(trans
, root
, path
);
1508 btrfs_free_path(path
);
1509 unlock_chunks(root
);
1510 btrfs_commit_transaction(trans
, root
);
1514 int btrfs_rm_device(struct btrfs_root
*root
, char *device_path
)
1516 struct btrfs_device
*device
;
1517 struct btrfs_device
*next_device
;
1518 struct block_device
*bdev
;
1519 struct buffer_head
*bh
= NULL
;
1520 struct btrfs_super_block
*disk_super
;
1521 struct btrfs_fs_devices
*cur_devices
;
1528 bool clear_super
= false;
1530 mutex_lock(&uuid_mutex
);
1533 seq
= read_seqbegin(&root
->fs_info
->profiles_lock
);
1535 all_avail
= root
->fs_info
->avail_data_alloc_bits
|
1536 root
->fs_info
->avail_system_alloc_bits
|
1537 root
->fs_info
->avail_metadata_alloc_bits
;
1538 } while (read_seqretry(&root
->fs_info
->profiles_lock
, seq
));
1540 num_devices
= root
->fs_info
->fs_devices
->num_devices
;
1541 btrfs_dev_replace_lock(&root
->fs_info
->dev_replace
);
1542 if (btrfs_dev_replace_is_ongoing(&root
->fs_info
->dev_replace
)) {
1543 WARN_ON(num_devices
< 1);
1546 btrfs_dev_replace_unlock(&root
->fs_info
->dev_replace
);
1548 if ((all_avail
& BTRFS_BLOCK_GROUP_RAID10
) && num_devices
<= 4) {
1549 ret
= BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET
;
1553 if ((all_avail
& BTRFS_BLOCK_GROUP_RAID1
) && num_devices
<= 2) {
1554 ret
= BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET
;
1558 if ((all_avail
& BTRFS_BLOCK_GROUP_RAID5
) &&
1559 root
->fs_info
->fs_devices
->rw_devices
<= 2) {
1560 ret
= BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET
;
1563 if ((all_avail
& BTRFS_BLOCK_GROUP_RAID6
) &&
1564 root
->fs_info
->fs_devices
->rw_devices
<= 3) {
1565 ret
= BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET
;
1569 if (strcmp(device_path
, "missing") == 0) {
1570 struct list_head
*devices
;
1571 struct btrfs_device
*tmp
;
1574 devices
= &root
->fs_info
->fs_devices
->devices
;
1576 * It is safe to read the devices since the volume_mutex
1579 list_for_each_entry(tmp
, devices
, dev_list
) {
1580 if (tmp
->in_fs_metadata
&&
1581 !tmp
->is_tgtdev_for_dev_replace
&&
1591 ret
= BTRFS_ERROR_DEV_MISSING_NOT_FOUND
;
1595 ret
= btrfs_get_bdev_and_sb(device_path
,
1596 FMODE_WRITE
| FMODE_EXCL
,
1597 root
->fs_info
->bdev_holder
, 0,
1601 disk_super
= (struct btrfs_super_block
*)bh
->b_data
;
1602 devid
= btrfs_stack_device_id(&disk_super
->dev_item
);
1603 dev_uuid
= disk_super
->dev_item
.uuid
;
1604 device
= btrfs_find_device(root
->fs_info
, devid
, dev_uuid
,
1612 if (device
->is_tgtdev_for_dev_replace
) {
1613 ret
= BTRFS_ERROR_DEV_TGT_REPLACE
;
1617 if (device
->writeable
&& root
->fs_info
->fs_devices
->rw_devices
== 1) {
1618 ret
= BTRFS_ERROR_DEV_ONLY_WRITABLE
;
1622 if (device
->writeable
) {
1624 list_del_init(&device
->dev_alloc_list
);
1625 unlock_chunks(root
);
1626 root
->fs_info
->fs_devices
->rw_devices
--;
1630 mutex_unlock(&uuid_mutex
);
1631 ret
= btrfs_shrink_device(device
, 0);
1632 mutex_lock(&uuid_mutex
);
1637 * TODO: the superblock still includes this device in its num_devices
1638 * counter although write_all_supers() is not locked out. This
1639 * could give a filesystem state which requires a degraded mount.
1641 ret
= btrfs_rm_dev_item(root
->fs_info
->chunk_root
, device
);
1645 spin_lock(&root
->fs_info
->free_chunk_lock
);
1646 root
->fs_info
->free_chunk_space
= device
->total_bytes
-
1648 spin_unlock(&root
->fs_info
->free_chunk_lock
);
1650 device
->in_fs_metadata
= 0;
1651 btrfs_scrub_cancel_dev(root
->fs_info
, device
);
1654 * the device list mutex makes sure that we don't change
1655 * the device list while someone else is writing out all
1656 * the device supers. Whoever is writing all supers, should
1657 * lock the device list mutex before getting the number of
1658 * devices in the super block (super_copy). Conversely,
1659 * whoever updates the number of devices in the super block
1660 * (super_copy) should hold the device list mutex.
1663 cur_devices
= device
->fs_devices
;
1664 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
1665 list_del_rcu(&device
->dev_list
);
1667 device
->fs_devices
->num_devices
--;
1668 device
->fs_devices
->total_devices
--;
1670 if (device
->missing
)
1671 root
->fs_info
->fs_devices
->missing_devices
--;
1673 next_device
= list_entry(root
->fs_info
->fs_devices
->devices
.next
,
1674 struct btrfs_device
, dev_list
);
1675 if (device
->bdev
== root
->fs_info
->sb
->s_bdev
)
1676 root
->fs_info
->sb
->s_bdev
= next_device
->bdev
;
1677 if (device
->bdev
== root
->fs_info
->fs_devices
->latest_bdev
)
1678 root
->fs_info
->fs_devices
->latest_bdev
= next_device
->bdev
;
1681 device
->fs_devices
->open_devices
--;
1683 call_rcu(&device
->rcu
, free_device
);
1685 num_devices
= btrfs_super_num_devices(root
->fs_info
->super_copy
) - 1;
1686 btrfs_set_super_num_devices(root
->fs_info
->super_copy
, num_devices
);
1687 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
1689 if (cur_devices
->open_devices
== 0) {
1690 struct btrfs_fs_devices
*fs_devices
;
1691 fs_devices
= root
->fs_info
->fs_devices
;
1692 while (fs_devices
) {
1693 if (fs_devices
->seed
== cur_devices
)
1695 fs_devices
= fs_devices
->seed
;
1697 fs_devices
->seed
= cur_devices
->seed
;
1698 cur_devices
->seed
= NULL
;
1700 __btrfs_close_devices(cur_devices
);
1701 unlock_chunks(root
);
1702 free_fs_devices(cur_devices
);
1705 root
->fs_info
->num_tolerated_disk_barrier_failures
=
1706 btrfs_calc_num_tolerated_disk_barrier_failures(root
->fs_info
);
1709 * at this point, the device is zero sized. We want to
1710 * remove it from the devices list and zero out the old super
1712 if (clear_super
&& disk_super
) {
1716 /* make sure this device isn't detected as part of
1719 memset(&disk_super
->magic
, 0, sizeof(disk_super
->magic
));
1720 set_buffer_dirty(bh
);
1721 sync_dirty_buffer(bh
);
1723 /* clear the mirror copies of super block on the disk
1724 * being removed, 0th copy is been taken care above and
1725 * the below would take of the rest
1727 for (i
= 1; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
1728 bytenr
= btrfs_sb_offset(i
);
1729 if (bytenr
+ BTRFS_SUPER_INFO_SIZE
>=
1730 i_size_read(bdev
->bd_inode
))
1734 bh
= __bread(bdev
, bytenr
/ 4096,
1735 BTRFS_SUPER_INFO_SIZE
);
1739 disk_super
= (struct btrfs_super_block
*)bh
->b_data
;
1741 if (btrfs_super_bytenr(disk_super
) != bytenr
||
1742 btrfs_super_magic(disk_super
) != BTRFS_MAGIC
) {
1745 memset(&disk_super
->magic
, 0,
1746 sizeof(disk_super
->magic
));
1747 set_buffer_dirty(bh
);
1748 sync_dirty_buffer(bh
);
1755 /* Notify udev that device has changed */
1756 btrfs_kobject_uevent(bdev
, KOBJ_CHANGE
);
1758 /* Update ctime/mtime for device path for libblkid */
1759 update_dev_time(device_path
);
1765 blkdev_put(bdev
, FMODE_READ
| FMODE_EXCL
);
1767 mutex_unlock(&uuid_mutex
);
1770 if (device
->writeable
) {
1772 list_add(&device
->dev_alloc_list
,
1773 &root
->fs_info
->fs_devices
->alloc_list
);
1774 unlock_chunks(root
);
1775 root
->fs_info
->fs_devices
->rw_devices
++;
1780 void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info
*fs_info
,
1781 struct btrfs_device
*srcdev
)
1783 WARN_ON(!mutex_is_locked(&fs_info
->fs_devices
->device_list_mutex
));
1785 list_del_rcu(&srcdev
->dev_list
);
1786 list_del_rcu(&srcdev
->dev_alloc_list
);
1787 fs_info
->fs_devices
->num_devices
--;
1788 if (srcdev
->missing
) {
1789 fs_info
->fs_devices
->missing_devices
--;
1790 fs_info
->fs_devices
->rw_devices
++;
1792 if (srcdev
->can_discard
)
1793 fs_info
->fs_devices
->num_can_discard
--;
1795 fs_info
->fs_devices
->open_devices
--;
1797 /* zero out the old super */
1798 btrfs_scratch_superblock(srcdev
);
1801 call_rcu(&srcdev
->rcu
, free_device
);
1804 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info
*fs_info
,
1805 struct btrfs_device
*tgtdev
)
1807 struct btrfs_device
*next_device
;
1810 mutex_lock(&fs_info
->fs_devices
->device_list_mutex
);
1812 btrfs_scratch_superblock(tgtdev
);
1813 fs_info
->fs_devices
->open_devices
--;
1815 fs_info
->fs_devices
->num_devices
--;
1816 if (tgtdev
->can_discard
)
1817 fs_info
->fs_devices
->num_can_discard
++;
1819 next_device
= list_entry(fs_info
->fs_devices
->devices
.next
,
1820 struct btrfs_device
, dev_list
);
1821 if (tgtdev
->bdev
== fs_info
->sb
->s_bdev
)
1822 fs_info
->sb
->s_bdev
= next_device
->bdev
;
1823 if (tgtdev
->bdev
== fs_info
->fs_devices
->latest_bdev
)
1824 fs_info
->fs_devices
->latest_bdev
= next_device
->bdev
;
1825 list_del_rcu(&tgtdev
->dev_list
);
1827 call_rcu(&tgtdev
->rcu
, free_device
);
1829 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
1832 static int btrfs_find_device_by_path(struct btrfs_root
*root
, char *device_path
,
1833 struct btrfs_device
**device
)
1836 struct btrfs_super_block
*disk_super
;
1839 struct block_device
*bdev
;
1840 struct buffer_head
*bh
;
1843 ret
= btrfs_get_bdev_and_sb(device_path
, FMODE_READ
,
1844 root
->fs_info
->bdev_holder
, 0, &bdev
, &bh
);
1847 disk_super
= (struct btrfs_super_block
*)bh
->b_data
;
1848 devid
= btrfs_stack_device_id(&disk_super
->dev_item
);
1849 dev_uuid
= disk_super
->dev_item
.uuid
;
1850 *device
= btrfs_find_device(root
->fs_info
, devid
, dev_uuid
,
1855 blkdev_put(bdev
, FMODE_READ
);
1859 int btrfs_find_device_missing_or_by_path(struct btrfs_root
*root
,
1861 struct btrfs_device
**device
)
1864 if (strcmp(device_path
, "missing") == 0) {
1865 struct list_head
*devices
;
1866 struct btrfs_device
*tmp
;
1868 devices
= &root
->fs_info
->fs_devices
->devices
;
1870 * It is safe to read the devices since the volume_mutex
1871 * is held by the caller.
1873 list_for_each_entry(tmp
, devices
, dev_list
) {
1874 if (tmp
->in_fs_metadata
&& !tmp
->bdev
) {
1881 btrfs_err(root
->fs_info
, "no missing device found");
1887 return btrfs_find_device_by_path(root
, device_path
, device
);
1892 * does all the dirty work required for changing file system's UUID.
1894 static int btrfs_prepare_sprout(struct btrfs_root
*root
)
1896 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
1897 struct btrfs_fs_devices
*old_devices
;
1898 struct btrfs_fs_devices
*seed_devices
;
1899 struct btrfs_super_block
*disk_super
= root
->fs_info
->super_copy
;
1900 struct btrfs_device
*device
;
1903 BUG_ON(!mutex_is_locked(&uuid_mutex
));
1904 if (!fs_devices
->seeding
)
1907 seed_devices
= __alloc_fs_devices();
1908 if (IS_ERR(seed_devices
))
1909 return PTR_ERR(seed_devices
);
1911 old_devices
= clone_fs_devices(fs_devices
);
1912 if (IS_ERR(old_devices
)) {
1913 kfree(seed_devices
);
1914 return PTR_ERR(old_devices
);
1917 list_add(&old_devices
->list
, &fs_uuids
);
1919 memcpy(seed_devices
, fs_devices
, sizeof(*seed_devices
));
1920 seed_devices
->opened
= 1;
1921 INIT_LIST_HEAD(&seed_devices
->devices
);
1922 INIT_LIST_HEAD(&seed_devices
->alloc_list
);
1923 mutex_init(&seed_devices
->device_list_mutex
);
1925 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
1926 list_splice_init_rcu(&fs_devices
->devices
, &seed_devices
->devices
,
1929 list_splice_init(&fs_devices
->alloc_list
, &seed_devices
->alloc_list
);
1930 list_for_each_entry(device
, &seed_devices
->devices
, dev_list
) {
1931 device
->fs_devices
= seed_devices
;
1934 fs_devices
->seeding
= 0;
1935 fs_devices
->num_devices
= 0;
1936 fs_devices
->open_devices
= 0;
1937 fs_devices
->seed
= seed_devices
;
1939 generate_random_uuid(fs_devices
->fsid
);
1940 memcpy(root
->fs_info
->fsid
, fs_devices
->fsid
, BTRFS_FSID_SIZE
);
1941 memcpy(disk_super
->fsid
, fs_devices
->fsid
, BTRFS_FSID_SIZE
);
1942 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
1944 super_flags
= btrfs_super_flags(disk_super
) &
1945 ~BTRFS_SUPER_FLAG_SEEDING
;
1946 btrfs_set_super_flags(disk_super
, super_flags
);
1952 * strore the expected generation for seed devices in device items.
1954 static int btrfs_finish_sprout(struct btrfs_trans_handle
*trans
,
1955 struct btrfs_root
*root
)
1957 struct btrfs_path
*path
;
1958 struct extent_buffer
*leaf
;
1959 struct btrfs_dev_item
*dev_item
;
1960 struct btrfs_device
*device
;
1961 struct btrfs_key key
;
1962 u8 fs_uuid
[BTRFS_UUID_SIZE
];
1963 u8 dev_uuid
[BTRFS_UUID_SIZE
];
1967 path
= btrfs_alloc_path();
1971 root
= root
->fs_info
->chunk_root
;
1972 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
1974 key
.type
= BTRFS_DEV_ITEM_KEY
;
1977 ret
= btrfs_search_slot(trans
, root
, &key
, path
, 0, 1);
1981 leaf
= path
->nodes
[0];
1983 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
1984 ret
= btrfs_next_leaf(root
, path
);
1989 leaf
= path
->nodes
[0];
1990 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1991 btrfs_release_path(path
);
1995 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1996 if (key
.objectid
!= BTRFS_DEV_ITEMS_OBJECTID
||
1997 key
.type
!= BTRFS_DEV_ITEM_KEY
)
2000 dev_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
2001 struct btrfs_dev_item
);
2002 devid
= btrfs_device_id(leaf
, dev_item
);
2003 read_extent_buffer(leaf
, dev_uuid
, btrfs_device_uuid(dev_item
),
2005 read_extent_buffer(leaf
, fs_uuid
, btrfs_device_fsid(dev_item
),
2007 device
= btrfs_find_device(root
->fs_info
, devid
, dev_uuid
,
2009 BUG_ON(!device
); /* Logic error */
2011 if (device
->fs_devices
->seeding
) {
2012 btrfs_set_device_generation(leaf
, dev_item
,
2013 device
->generation
);
2014 btrfs_mark_buffer_dirty(leaf
);
2022 btrfs_free_path(path
);
2026 int btrfs_init_new_device(struct btrfs_root
*root
, char *device_path
)
2028 struct request_queue
*q
;
2029 struct btrfs_trans_handle
*trans
;
2030 struct btrfs_device
*device
;
2031 struct block_device
*bdev
;
2032 struct list_head
*devices
;
2033 struct super_block
*sb
= root
->fs_info
->sb
;
2034 struct rcu_string
*name
;
2036 int seeding_dev
= 0;
2039 if ((sb
->s_flags
& MS_RDONLY
) && !root
->fs_info
->fs_devices
->seeding
)
2042 bdev
= blkdev_get_by_path(device_path
, FMODE_WRITE
| FMODE_EXCL
,
2043 root
->fs_info
->bdev_holder
);
2045 return PTR_ERR(bdev
);
2047 if (root
->fs_info
->fs_devices
->seeding
) {
2049 down_write(&sb
->s_umount
);
2050 mutex_lock(&uuid_mutex
);
2053 filemap_write_and_wait(bdev
->bd_inode
->i_mapping
);
2055 devices
= &root
->fs_info
->fs_devices
->devices
;
2057 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
2058 list_for_each_entry(device
, devices
, dev_list
) {
2059 if (device
->bdev
== bdev
) {
2062 &root
->fs_info
->fs_devices
->device_list_mutex
);
2066 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
2068 device
= btrfs_alloc_device(root
->fs_info
, NULL
, NULL
);
2069 if (IS_ERR(device
)) {
2070 /* we can safely leave the fs_devices entry around */
2071 ret
= PTR_ERR(device
);
2075 name
= rcu_string_strdup(device_path
, GFP_NOFS
);
2081 rcu_assign_pointer(device
->name
, name
);
2083 trans
= btrfs_start_transaction(root
, 0);
2084 if (IS_ERR(trans
)) {
2085 rcu_string_free(device
->name
);
2087 ret
= PTR_ERR(trans
);
2093 q
= bdev_get_queue(bdev
);
2094 if (blk_queue_discard(q
))
2095 device
->can_discard
= 1;
2096 device
->writeable
= 1;
2097 device
->generation
= trans
->transid
;
2098 device
->io_width
= root
->sectorsize
;
2099 device
->io_align
= root
->sectorsize
;
2100 device
->sector_size
= root
->sectorsize
;
2101 device
->total_bytes
= i_size_read(bdev
->bd_inode
);
2102 device
->disk_total_bytes
= device
->total_bytes
;
2103 device
->dev_root
= root
->fs_info
->dev_root
;
2104 device
->bdev
= bdev
;
2105 device
->in_fs_metadata
= 1;
2106 device
->is_tgtdev_for_dev_replace
= 0;
2107 device
->mode
= FMODE_EXCL
;
2108 device
->dev_stats_valid
= 1;
2109 set_blocksize(device
->bdev
, 4096);
2112 sb
->s_flags
&= ~MS_RDONLY
;
2113 ret
= btrfs_prepare_sprout(root
);
2114 BUG_ON(ret
); /* -ENOMEM */
2117 device
->fs_devices
= root
->fs_info
->fs_devices
;
2119 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
2120 list_add_rcu(&device
->dev_list
, &root
->fs_info
->fs_devices
->devices
);
2121 list_add(&device
->dev_alloc_list
,
2122 &root
->fs_info
->fs_devices
->alloc_list
);
2123 root
->fs_info
->fs_devices
->num_devices
++;
2124 root
->fs_info
->fs_devices
->open_devices
++;
2125 root
->fs_info
->fs_devices
->rw_devices
++;
2126 root
->fs_info
->fs_devices
->total_devices
++;
2127 if (device
->can_discard
)
2128 root
->fs_info
->fs_devices
->num_can_discard
++;
2129 root
->fs_info
->fs_devices
->total_rw_bytes
+= device
->total_bytes
;
2131 spin_lock(&root
->fs_info
->free_chunk_lock
);
2132 root
->fs_info
->free_chunk_space
+= device
->total_bytes
;
2133 spin_unlock(&root
->fs_info
->free_chunk_lock
);
2135 if (!blk_queue_nonrot(bdev_get_queue(bdev
)))
2136 root
->fs_info
->fs_devices
->rotating
= 1;
2138 total_bytes
= btrfs_super_total_bytes(root
->fs_info
->super_copy
);
2139 btrfs_set_super_total_bytes(root
->fs_info
->super_copy
,
2140 total_bytes
+ device
->total_bytes
);
2142 total_bytes
= btrfs_super_num_devices(root
->fs_info
->super_copy
);
2143 btrfs_set_super_num_devices(root
->fs_info
->super_copy
,
2145 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
2148 ret
= init_first_rw_device(trans
, root
, device
);
2150 btrfs_abort_transaction(trans
, root
, ret
);
2153 ret
= btrfs_finish_sprout(trans
, root
);
2155 btrfs_abort_transaction(trans
, root
, ret
);
2159 ret
= btrfs_add_device(trans
, root
, device
);
2161 btrfs_abort_transaction(trans
, root
, ret
);
2167 * we've got more storage, clear any full flags on the space
2170 btrfs_clear_space_info_full(root
->fs_info
);
2172 unlock_chunks(root
);
2173 root
->fs_info
->num_tolerated_disk_barrier_failures
=
2174 btrfs_calc_num_tolerated_disk_barrier_failures(root
->fs_info
);
2175 ret
= btrfs_commit_transaction(trans
, root
);
2178 mutex_unlock(&uuid_mutex
);
2179 up_write(&sb
->s_umount
);
2181 if (ret
) /* transaction commit */
2184 ret
= btrfs_relocate_sys_chunks(root
);
2186 btrfs_error(root
->fs_info
, ret
,
2187 "Failed to relocate sys chunks after "
2188 "device initialization. This can be fixed "
2189 "using the \"btrfs balance\" command.");
2190 trans
= btrfs_attach_transaction(root
);
2191 if (IS_ERR(trans
)) {
2192 if (PTR_ERR(trans
) == -ENOENT
)
2194 return PTR_ERR(trans
);
2196 ret
= btrfs_commit_transaction(trans
, root
);
2199 /* Update ctime/mtime for libblkid */
2200 update_dev_time(device_path
);
2204 unlock_chunks(root
);
2205 btrfs_end_transaction(trans
, root
);
2206 rcu_string_free(device
->name
);
2209 blkdev_put(bdev
, FMODE_EXCL
);
2211 mutex_unlock(&uuid_mutex
);
2212 up_write(&sb
->s_umount
);
2217 int btrfs_init_dev_replace_tgtdev(struct btrfs_root
*root
, char *device_path
,
2218 struct btrfs_device
**device_out
)
2220 struct request_queue
*q
;
2221 struct btrfs_device
*device
;
2222 struct block_device
*bdev
;
2223 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2224 struct list_head
*devices
;
2225 struct rcu_string
*name
;
2226 u64 devid
= BTRFS_DEV_REPLACE_DEVID
;
2230 if (fs_info
->fs_devices
->seeding
)
2233 bdev
= blkdev_get_by_path(device_path
, FMODE_WRITE
| FMODE_EXCL
,
2234 fs_info
->bdev_holder
);
2236 return PTR_ERR(bdev
);
2238 filemap_write_and_wait(bdev
->bd_inode
->i_mapping
);
2240 devices
= &fs_info
->fs_devices
->devices
;
2241 list_for_each_entry(device
, devices
, dev_list
) {
2242 if (device
->bdev
== bdev
) {
2248 device
= btrfs_alloc_device(NULL
, &devid
, NULL
);
2249 if (IS_ERR(device
)) {
2250 ret
= PTR_ERR(device
);
2254 name
= rcu_string_strdup(device_path
, GFP_NOFS
);
2260 rcu_assign_pointer(device
->name
, name
);
2262 q
= bdev_get_queue(bdev
);
2263 if (blk_queue_discard(q
))
2264 device
->can_discard
= 1;
2265 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
2266 device
->writeable
= 1;
2267 device
->generation
= 0;
2268 device
->io_width
= root
->sectorsize
;
2269 device
->io_align
= root
->sectorsize
;
2270 device
->sector_size
= root
->sectorsize
;
2271 device
->total_bytes
= i_size_read(bdev
->bd_inode
);
2272 device
->disk_total_bytes
= device
->total_bytes
;
2273 device
->dev_root
= fs_info
->dev_root
;
2274 device
->bdev
= bdev
;
2275 device
->in_fs_metadata
= 1;
2276 device
->is_tgtdev_for_dev_replace
= 1;
2277 device
->mode
= FMODE_EXCL
;
2278 device
->dev_stats_valid
= 1;
2279 set_blocksize(device
->bdev
, 4096);
2280 device
->fs_devices
= fs_info
->fs_devices
;
2281 list_add(&device
->dev_list
, &fs_info
->fs_devices
->devices
);
2282 fs_info
->fs_devices
->num_devices
++;
2283 fs_info
->fs_devices
->open_devices
++;
2284 if (device
->can_discard
)
2285 fs_info
->fs_devices
->num_can_discard
++;
2286 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
2288 *device_out
= device
;
2292 blkdev_put(bdev
, FMODE_EXCL
);
2296 void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info
*fs_info
,
2297 struct btrfs_device
*tgtdev
)
2299 WARN_ON(fs_info
->fs_devices
->rw_devices
== 0);
2300 tgtdev
->io_width
= fs_info
->dev_root
->sectorsize
;
2301 tgtdev
->io_align
= fs_info
->dev_root
->sectorsize
;
2302 tgtdev
->sector_size
= fs_info
->dev_root
->sectorsize
;
2303 tgtdev
->dev_root
= fs_info
->dev_root
;
2304 tgtdev
->in_fs_metadata
= 1;
2307 static noinline
int btrfs_update_device(struct btrfs_trans_handle
*trans
,
2308 struct btrfs_device
*device
)
2311 struct btrfs_path
*path
;
2312 struct btrfs_root
*root
;
2313 struct btrfs_dev_item
*dev_item
;
2314 struct extent_buffer
*leaf
;
2315 struct btrfs_key key
;
2317 root
= device
->dev_root
->fs_info
->chunk_root
;
2319 path
= btrfs_alloc_path();
2323 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
2324 key
.type
= BTRFS_DEV_ITEM_KEY
;
2325 key
.offset
= device
->devid
;
2327 ret
= btrfs_search_slot(trans
, root
, &key
, path
, 0, 1);
2336 leaf
= path
->nodes
[0];
2337 dev_item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_dev_item
);
2339 btrfs_set_device_id(leaf
, dev_item
, device
->devid
);
2340 btrfs_set_device_type(leaf
, dev_item
, device
->type
);
2341 btrfs_set_device_io_align(leaf
, dev_item
, device
->io_align
);
2342 btrfs_set_device_io_width(leaf
, dev_item
, device
->io_width
);
2343 btrfs_set_device_sector_size(leaf
, dev_item
, device
->sector_size
);
2344 btrfs_set_device_total_bytes(leaf
, dev_item
, device
->disk_total_bytes
);
2345 btrfs_set_device_bytes_used(leaf
, dev_item
, device
->bytes_used
);
2346 btrfs_mark_buffer_dirty(leaf
);
2349 btrfs_free_path(path
);
2353 static int __btrfs_grow_device(struct btrfs_trans_handle
*trans
,
2354 struct btrfs_device
*device
, u64 new_size
)
2356 struct btrfs_super_block
*super_copy
=
2357 device
->dev_root
->fs_info
->super_copy
;
2358 u64 old_total
= btrfs_super_total_bytes(super_copy
);
2359 u64 diff
= new_size
- device
->total_bytes
;
2361 if (!device
->writeable
)
2363 if (new_size
<= device
->total_bytes
||
2364 device
->is_tgtdev_for_dev_replace
)
2367 btrfs_set_super_total_bytes(super_copy
, old_total
+ diff
);
2368 device
->fs_devices
->total_rw_bytes
+= diff
;
2370 device
->total_bytes
= new_size
;
2371 device
->disk_total_bytes
= new_size
;
2372 btrfs_clear_space_info_full(device
->dev_root
->fs_info
);
2374 return btrfs_update_device(trans
, device
);
2377 int btrfs_grow_device(struct btrfs_trans_handle
*trans
,
2378 struct btrfs_device
*device
, u64 new_size
)
2381 lock_chunks(device
->dev_root
);
2382 ret
= __btrfs_grow_device(trans
, device
, new_size
);
2383 unlock_chunks(device
->dev_root
);
2387 static int btrfs_free_chunk(struct btrfs_trans_handle
*trans
,
2388 struct btrfs_root
*root
,
2389 u64 chunk_tree
, u64 chunk_objectid
,
2393 struct btrfs_path
*path
;
2394 struct btrfs_key key
;
2396 root
= root
->fs_info
->chunk_root
;
2397 path
= btrfs_alloc_path();
2401 key
.objectid
= chunk_objectid
;
2402 key
.offset
= chunk_offset
;
2403 key
.type
= BTRFS_CHUNK_ITEM_KEY
;
2405 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
2408 else if (ret
> 0) { /* Logic error or corruption */
2409 btrfs_error(root
->fs_info
, -ENOENT
,
2410 "Failed lookup while freeing chunk.");
2415 ret
= btrfs_del_item(trans
, root
, path
);
2417 btrfs_error(root
->fs_info
, ret
,
2418 "Failed to delete chunk item.");
2420 btrfs_free_path(path
);
2424 static int btrfs_del_sys_chunk(struct btrfs_root
*root
, u64 chunk_objectid
, u64
2427 struct btrfs_super_block
*super_copy
= root
->fs_info
->super_copy
;
2428 struct btrfs_disk_key
*disk_key
;
2429 struct btrfs_chunk
*chunk
;
2436 struct btrfs_key key
;
2438 array_size
= btrfs_super_sys_array_size(super_copy
);
2440 ptr
= super_copy
->sys_chunk_array
;
2443 while (cur
< array_size
) {
2444 disk_key
= (struct btrfs_disk_key
*)ptr
;
2445 btrfs_disk_key_to_cpu(&key
, disk_key
);
2447 len
= sizeof(*disk_key
);
2449 if (key
.type
== BTRFS_CHUNK_ITEM_KEY
) {
2450 chunk
= (struct btrfs_chunk
*)(ptr
+ len
);
2451 num_stripes
= btrfs_stack_chunk_num_stripes(chunk
);
2452 len
+= btrfs_chunk_item_size(num_stripes
);
2457 if (key
.objectid
== chunk_objectid
&&
2458 key
.offset
== chunk_offset
) {
2459 memmove(ptr
, ptr
+ len
, array_size
- (cur
+ len
));
2461 btrfs_set_super_sys_array_size(super_copy
, array_size
);
2470 static int btrfs_relocate_chunk(struct btrfs_root
*root
,
2471 u64 chunk_tree
, u64 chunk_objectid
,
2474 struct extent_map_tree
*em_tree
;
2475 struct btrfs_root
*extent_root
;
2476 struct btrfs_trans_handle
*trans
;
2477 struct extent_map
*em
;
2478 struct map_lookup
*map
;
2482 root
= root
->fs_info
->chunk_root
;
2483 extent_root
= root
->fs_info
->extent_root
;
2484 em_tree
= &root
->fs_info
->mapping_tree
.map_tree
;
2486 ret
= btrfs_can_relocate(extent_root
, chunk_offset
);
2490 /* step one, relocate all the extents inside this chunk */
2491 ret
= btrfs_relocate_block_group(extent_root
, chunk_offset
);
2495 trans
= btrfs_start_transaction(root
, 0);
2496 if (IS_ERR(trans
)) {
2497 ret
= PTR_ERR(trans
);
2498 btrfs_std_error(root
->fs_info
, ret
);
2505 * step two, delete the device extents and the
2506 * chunk tree entries
2508 read_lock(&em_tree
->lock
);
2509 em
= lookup_extent_mapping(em_tree
, chunk_offset
, 1);
2510 read_unlock(&em_tree
->lock
);
2512 BUG_ON(!em
|| em
->start
> chunk_offset
||
2513 em
->start
+ em
->len
< chunk_offset
);
2514 map
= (struct map_lookup
*)em
->bdev
;
2516 for (i
= 0; i
< map
->num_stripes
; i
++) {
2517 ret
= btrfs_free_dev_extent(trans
, map
->stripes
[i
].dev
,
2518 map
->stripes
[i
].physical
);
2521 if (map
->stripes
[i
].dev
) {
2522 ret
= btrfs_update_device(trans
, map
->stripes
[i
].dev
);
2526 ret
= btrfs_free_chunk(trans
, root
, chunk_tree
, chunk_objectid
,
2531 trace_btrfs_chunk_free(root
, map
, chunk_offset
, em
->len
);
2533 if (map
->type
& BTRFS_BLOCK_GROUP_SYSTEM
) {
2534 ret
= btrfs_del_sys_chunk(root
, chunk_objectid
, chunk_offset
);
2538 ret
= btrfs_remove_block_group(trans
, extent_root
, chunk_offset
);
2541 write_lock(&em_tree
->lock
);
2542 remove_extent_mapping(em_tree
, em
);
2543 write_unlock(&em_tree
->lock
);
2548 /* once for the tree */
2549 free_extent_map(em
);
2551 free_extent_map(em
);
2553 unlock_chunks(root
);
2554 btrfs_end_transaction(trans
, root
);
2558 static int btrfs_relocate_sys_chunks(struct btrfs_root
*root
)
2560 struct btrfs_root
*chunk_root
= root
->fs_info
->chunk_root
;
2561 struct btrfs_path
*path
;
2562 struct extent_buffer
*leaf
;
2563 struct btrfs_chunk
*chunk
;
2564 struct btrfs_key key
;
2565 struct btrfs_key found_key
;
2566 u64 chunk_tree
= chunk_root
->root_key
.objectid
;
2568 bool retried
= false;
2572 path
= btrfs_alloc_path();
2577 key
.objectid
= BTRFS_FIRST_CHUNK_TREE_OBJECTID
;
2578 key
.offset
= (u64
)-1;
2579 key
.type
= BTRFS_CHUNK_ITEM_KEY
;
2582 ret
= btrfs_search_slot(NULL
, chunk_root
, &key
, path
, 0, 0);
2585 BUG_ON(ret
== 0); /* Corruption */
2587 ret
= btrfs_previous_item(chunk_root
, path
, key
.objectid
,
2594 leaf
= path
->nodes
[0];
2595 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
2597 chunk
= btrfs_item_ptr(leaf
, path
->slots
[0],
2598 struct btrfs_chunk
);
2599 chunk_type
= btrfs_chunk_type(leaf
, chunk
);
2600 btrfs_release_path(path
);
2602 if (chunk_type
& BTRFS_BLOCK_GROUP_SYSTEM
) {
2603 ret
= btrfs_relocate_chunk(chunk_root
, chunk_tree
,
2612 if (found_key
.offset
== 0)
2614 key
.offset
= found_key
.offset
- 1;
2617 if (failed
&& !retried
) {
2621 } else if (WARN_ON(failed
&& retried
)) {
2625 btrfs_free_path(path
);
2629 static int insert_balance_item(struct btrfs_root
*root
,
2630 struct btrfs_balance_control
*bctl
)
2632 struct btrfs_trans_handle
*trans
;
2633 struct btrfs_balance_item
*item
;
2634 struct btrfs_disk_balance_args disk_bargs
;
2635 struct btrfs_path
*path
;
2636 struct extent_buffer
*leaf
;
2637 struct btrfs_key key
;
2640 path
= btrfs_alloc_path();
2644 trans
= btrfs_start_transaction(root
, 0);
2645 if (IS_ERR(trans
)) {
2646 btrfs_free_path(path
);
2647 return PTR_ERR(trans
);
2650 key
.objectid
= BTRFS_BALANCE_OBJECTID
;
2651 key
.type
= BTRFS_BALANCE_ITEM_KEY
;
2654 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2659 leaf
= path
->nodes
[0];
2660 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_balance_item
);
2662 memset_extent_buffer(leaf
, 0, (unsigned long)item
, sizeof(*item
));
2664 btrfs_cpu_balance_args_to_disk(&disk_bargs
, &bctl
->data
);
2665 btrfs_set_balance_data(leaf
, item
, &disk_bargs
);
2666 btrfs_cpu_balance_args_to_disk(&disk_bargs
, &bctl
->meta
);
2667 btrfs_set_balance_meta(leaf
, item
, &disk_bargs
);
2668 btrfs_cpu_balance_args_to_disk(&disk_bargs
, &bctl
->sys
);
2669 btrfs_set_balance_sys(leaf
, item
, &disk_bargs
);
2671 btrfs_set_balance_flags(leaf
, item
, bctl
->flags
);
2673 btrfs_mark_buffer_dirty(leaf
);
2675 btrfs_free_path(path
);
2676 err
= btrfs_commit_transaction(trans
, root
);
2682 static int del_balance_item(struct btrfs_root
*root
)
2684 struct btrfs_trans_handle
*trans
;
2685 struct btrfs_path
*path
;
2686 struct btrfs_key key
;
2689 path
= btrfs_alloc_path();
2693 trans
= btrfs_start_transaction(root
, 0);
2694 if (IS_ERR(trans
)) {
2695 btrfs_free_path(path
);
2696 return PTR_ERR(trans
);
2699 key
.objectid
= BTRFS_BALANCE_OBJECTID
;
2700 key
.type
= BTRFS_BALANCE_ITEM_KEY
;
2703 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
2711 ret
= btrfs_del_item(trans
, root
, path
);
2713 btrfs_free_path(path
);
2714 err
= btrfs_commit_transaction(trans
, root
);
2721 * This is a heuristic used to reduce the number of chunks balanced on
2722 * resume after balance was interrupted.
2724 static void update_balance_args(struct btrfs_balance_control
*bctl
)
2727 * Turn on soft mode for chunk types that were being converted.
2729 if (bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)
2730 bctl
->data
.flags
|= BTRFS_BALANCE_ARGS_SOFT
;
2731 if (bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)
2732 bctl
->sys
.flags
|= BTRFS_BALANCE_ARGS_SOFT
;
2733 if (bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)
2734 bctl
->meta
.flags
|= BTRFS_BALANCE_ARGS_SOFT
;
2737 * Turn on usage filter if is not already used. The idea is
2738 * that chunks that we have already balanced should be
2739 * reasonably full. Don't do it for chunks that are being
2740 * converted - that will keep us from relocating unconverted
2741 * (albeit full) chunks.
2743 if (!(bctl
->data
.flags
& BTRFS_BALANCE_ARGS_USAGE
) &&
2744 !(bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)) {
2745 bctl
->data
.flags
|= BTRFS_BALANCE_ARGS_USAGE
;
2746 bctl
->data
.usage
= 90;
2748 if (!(bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_USAGE
) &&
2749 !(bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)) {
2750 bctl
->sys
.flags
|= BTRFS_BALANCE_ARGS_USAGE
;
2751 bctl
->sys
.usage
= 90;
2753 if (!(bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_USAGE
) &&
2754 !(bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)) {
2755 bctl
->meta
.flags
|= BTRFS_BALANCE_ARGS_USAGE
;
2756 bctl
->meta
.usage
= 90;
2761 * Should be called with both balance and volume mutexes held to
2762 * serialize other volume operations (add_dev/rm_dev/resize) with
2763 * restriper. Same goes for unset_balance_control.
2765 static void set_balance_control(struct btrfs_balance_control
*bctl
)
2767 struct btrfs_fs_info
*fs_info
= bctl
->fs_info
;
2769 BUG_ON(fs_info
->balance_ctl
);
2771 spin_lock(&fs_info
->balance_lock
);
2772 fs_info
->balance_ctl
= bctl
;
2773 spin_unlock(&fs_info
->balance_lock
);
2776 static void unset_balance_control(struct btrfs_fs_info
*fs_info
)
2778 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
2780 BUG_ON(!fs_info
->balance_ctl
);
2782 spin_lock(&fs_info
->balance_lock
);
2783 fs_info
->balance_ctl
= NULL
;
2784 spin_unlock(&fs_info
->balance_lock
);
2790 * Balance filters. Return 1 if chunk should be filtered out
2791 * (should not be balanced).
2793 static int chunk_profiles_filter(u64 chunk_type
,
2794 struct btrfs_balance_args
*bargs
)
2796 chunk_type
= chunk_to_extended(chunk_type
) &
2797 BTRFS_EXTENDED_PROFILE_MASK
;
2799 if (bargs
->profiles
& chunk_type
)
2805 static int chunk_usage_filter(struct btrfs_fs_info
*fs_info
, u64 chunk_offset
,
2806 struct btrfs_balance_args
*bargs
)
2808 struct btrfs_block_group_cache
*cache
;
2809 u64 chunk_used
, user_thresh
;
2812 cache
= btrfs_lookup_block_group(fs_info
, chunk_offset
);
2813 chunk_used
= btrfs_block_group_used(&cache
->item
);
2815 if (bargs
->usage
== 0)
2817 else if (bargs
->usage
> 100)
2818 user_thresh
= cache
->key
.offset
;
2820 user_thresh
= div_factor_fine(cache
->key
.offset
,
2823 if (chunk_used
< user_thresh
)
2826 btrfs_put_block_group(cache
);
2830 static int chunk_devid_filter(struct extent_buffer
*leaf
,
2831 struct btrfs_chunk
*chunk
,
2832 struct btrfs_balance_args
*bargs
)
2834 struct btrfs_stripe
*stripe
;
2835 int num_stripes
= btrfs_chunk_num_stripes(leaf
, chunk
);
2838 for (i
= 0; i
< num_stripes
; i
++) {
2839 stripe
= btrfs_stripe_nr(chunk
, i
);
2840 if (btrfs_stripe_devid(leaf
, stripe
) == bargs
->devid
)
2847 /* [pstart, pend) */
2848 static int chunk_drange_filter(struct extent_buffer
*leaf
,
2849 struct btrfs_chunk
*chunk
,
2851 struct btrfs_balance_args
*bargs
)
2853 struct btrfs_stripe
*stripe
;
2854 int num_stripes
= btrfs_chunk_num_stripes(leaf
, chunk
);
2860 if (!(bargs
->flags
& BTRFS_BALANCE_ARGS_DEVID
))
2863 if (btrfs_chunk_type(leaf
, chunk
) & (BTRFS_BLOCK_GROUP_DUP
|
2864 BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID10
)) {
2865 factor
= num_stripes
/ 2;
2866 } else if (btrfs_chunk_type(leaf
, chunk
) & BTRFS_BLOCK_GROUP_RAID5
) {
2867 factor
= num_stripes
- 1;
2868 } else if (btrfs_chunk_type(leaf
, chunk
) & BTRFS_BLOCK_GROUP_RAID6
) {
2869 factor
= num_stripes
- 2;
2871 factor
= num_stripes
;
2874 for (i
= 0; i
< num_stripes
; i
++) {
2875 stripe
= btrfs_stripe_nr(chunk
, i
);
2876 if (btrfs_stripe_devid(leaf
, stripe
) != bargs
->devid
)
2879 stripe_offset
= btrfs_stripe_offset(leaf
, stripe
);
2880 stripe_length
= btrfs_chunk_length(leaf
, chunk
);
2881 do_div(stripe_length
, factor
);
2883 if (stripe_offset
< bargs
->pend
&&
2884 stripe_offset
+ stripe_length
> bargs
->pstart
)
2891 /* [vstart, vend) */
2892 static int chunk_vrange_filter(struct extent_buffer
*leaf
,
2893 struct btrfs_chunk
*chunk
,
2895 struct btrfs_balance_args
*bargs
)
2897 if (chunk_offset
< bargs
->vend
&&
2898 chunk_offset
+ btrfs_chunk_length(leaf
, chunk
) > bargs
->vstart
)
2899 /* at least part of the chunk is inside this vrange */
2905 static int chunk_soft_convert_filter(u64 chunk_type
,
2906 struct btrfs_balance_args
*bargs
)
2908 if (!(bargs
->flags
& BTRFS_BALANCE_ARGS_CONVERT
))
2911 chunk_type
= chunk_to_extended(chunk_type
) &
2912 BTRFS_EXTENDED_PROFILE_MASK
;
2914 if (bargs
->target
== chunk_type
)
2920 static int should_balance_chunk(struct btrfs_root
*root
,
2921 struct extent_buffer
*leaf
,
2922 struct btrfs_chunk
*chunk
, u64 chunk_offset
)
2924 struct btrfs_balance_control
*bctl
= root
->fs_info
->balance_ctl
;
2925 struct btrfs_balance_args
*bargs
= NULL
;
2926 u64 chunk_type
= btrfs_chunk_type(leaf
, chunk
);
2929 if (!((chunk_type
& BTRFS_BLOCK_GROUP_TYPE_MASK
) &
2930 (bctl
->flags
& BTRFS_BALANCE_TYPE_MASK
))) {
2934 if (chunk_type
& BTRFS_BLOCK_GROUP_DATA
)
2935 bargs
= &bctl
->data
;
2936 else if (chunk_type
& BTRFS_BLOCK_GROUP_SYSTEM
)
2938 else if (chunk_type
& BTRFS_BLOCK_GROUP_METADATA
)
2939 bargs
= &bctl
->meta
;
2941 /* profiles filter */
2942 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_PROFILES
) &&
2943 chunk_profiles_filter(chunk_type
, bargs
)) {
2948 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_USAGE
) &&
2949 chunk_usage_filter(bctl
->fs_info
, chunk_offset
, bargs
)) {
2954 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_DEVID
) &&
2955 chunk_devid_filter(leaf
, chunk
, bargs
)) {
2959 /* drange filter, makes sense only with devid filter */
2960 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_DRANGE
) &&
2961 chunk_drange_filter(leaf
, chunk
, chunk_offset
, bargs
)) {
2966 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_VRANGE
) &&
2967 chunk_vrange_filter(leaf
, chunk
, chunk_offset
, bargs
)) {
2971 /* soft profile changing mode */
2972 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_SOFT
) &&
2973 chunk_soft_convert_filter(chunk_type
, bargs
)) {
2978 * limited by count, must be the last filter
2980 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_LIMIT
)) {
2981 if (bargs
->limit
== 0)
2990 static int __btrfs_balance(struct btrfs_fs_info
*fs_info
)
2992 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
2993 struct btrfs_root
*chunk_root
= fs_info
->chunk_root
;
2994 struct btrfs_root
*dev_root
= fs_info
->dev_root
;
2995 struct list_head
*devices
;
2996 struct btrfs_device
*device
;
2999 struct btrfs_chunk
*chunk
;
3000 struct btrfs_path
*path
;
3001 struct btrfs_key key
;
3002 struct btrfs_key found_key
;
3003 struct btrfs_trans_handle
*trans
;
3004 struct extent_buffer
*leaf
;
3007 int enospc_errors
= 0;
3008 bool counting
= true;
3009 u64 limit_data
= bctl
->data
.limit
;
3010 u64 limit_meta
= bctl
->meta
.limit
;
3011 u64 limit_sys
= bctl
->sys
.limit
;
3013 /* step one make some room on all the devices */
3014 devices
= &fs_info
->fs_devices
->devices
;
3015 list_for_each_entry(device
, devices
, dev_list
) {
3016 old_size
= device
->total_bytes
;
3017 size_to_free
= div_factor(old_size
, 1);
3018 size_to_free
= min(size_to_free
, (u64
)1 * 1024 * 1024);
3019 if (!device
->writeable
||
3020 device
->total_bytes
- device
->bytes_used
> size_to_free
||
3021 device
->is_tgtdev_for_dev_replace
)
3024 ret
= btrfs_shrink_device(device
, old_size
- size_to_free
);
3029 trans
= btrfs_start_transaction(dev_root
, 0);
3030 BUG_ON(IS_ERR(trans
));
3032 ret
= btrfs_grow_device(trans
, device
, old_size
);
3035 btrfs_end_transaction(trans
, dev_root
);
3038 /* step two, relocate all the chunks */
3039 path
= btrfs_alloc_path();
3045 /* zero out stat counters */
3046 spin_lock(&fs_info
->balance_lock
);
3047 memset(&bctl
->stat
, 0, sizeof(bctl
->stat
));
3048 spin_unlock(&fs_info
->balance_lock
);
3051 bctl
->data
.limit
= limit_data
;
3052 bctl
->meta
.limit
= limit_meta
;
3053 bctl
->sys
.limit
= limit_sys
;
3055 key
.objectid
= BTRFS_FIRST_CHUNK_TREE_OBJECTID
;
3056 key
.offset
= (u64
)-1;
3057 key
.type
= BTRFS_CHUNK_ITEM_KEY
;
3060 if ((!counting
&& atomic_read(&fs_info
->balance_pause_req
)) ||
3061 atomic_read(&fs_info
->balance_cancel_req
)) {
3066 ret
= btrfs_search_slot(NULL
, chunk_root
, &key
, path
, 0, 0);
3071 * this shouldn't happen, it means the last relocate
3075 BUG(); /* FIXME break ? */
3077 ret
= btrfs_previous_item(chunk_root
, path
, 0,
3078 BTRFS_CHUNK_ITEM_KEY
);
3084 leaf
= path
->nodes
[0];
3085 slot
= path
->slots
[0];
3086 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
3088 if (found_key
.objectid
!= key
.objectid
)
3091 chunk
= btrfs_item_ptr(leaf
, slot
, struct btrfs_chunk
);
3094 spin_lock(&fs_info
->balance_lock
);
3095 bctl
->stat
.considered
++;
3096 spin_unlock(&fs_info
->balance_lock
);
3099 ret
= should_balance_chunk(chunk_root
, leaf
, chunk
,
3101 btrfs_release_path(path
);
3106 spin_lock(&fs_info
->balance_lock
);
3107 bctl
->stat
.expected
++;
3108 spin_unlock(&fs_info
->balance_lock
);
3112 ret
= btrfs_relocate_chunk(chunk_root
,
3113 chunk_root
->root_key
.objectid
,
3116 if (ret
&& ret
!= -ENOSPC
)
3118 if (ret
== -ENOSPC
) {
3121 spin_lock(&fs_info
->balance_lock
);
3122 bctl
->stat
.completed
++;
3123 spin_unlock(&fs_info
->balance_lock
);
3126 if (found_key
.offset
== 0)
3128 key
.offset
= found_key
.offset
- 1;
3132 btrfs_release_path(path
);
3137 btrfs_free_path(path
);
3138 if (enospc_errors
) {
3139 btrfs_info(fs_info
, "%d enospc errors during balance",
3149 * alloc_profile_is_valid - see if a given profile is valid and reduced
3150 * @flags: profile to validate
3151 * @extended: if true @flags is treated as an extended profile
3153 static int alloc_profile_is_valid(u64 flags
, int extended
)
3155 u64 mask
= (extended
? BTRFS_EXTENDED_PROFILE_MASK
:
3156 BTRFS_BLOCK_GROUP_PROFILE_MASK
);
3158 flags
&= ~BTRFS_BLOCK_GROUP_TYPE_MASK
;
3160 /* 1) check that all other bits are zeroed */
3164 /* 2) see if profile is reduced */
3166 return !extended
; /* "0" is valid for usual profiles */
3168 /* true if exactly one bit set */
3169 return (flags
& (flags
- 1)) == 0;
3172 static inline int balance_need_close(struct btrfs_fs_info
*fs_info
)
3174 /* cancel requested || normal exit path */
3175 return atomic_read(&fs_info
->balance_cancel_req
) ||
3176 (atomic_read(&fs_info
->balance_pause_req
) == 0 &&
3177 atomic_read(&fs_info
->balance_cancel_req
) == 0);
3180 static void __cancel_balance(struct btrfs_fs_info
*fs_info
)
3184 unset_balance_control(fs_info
);
3185 ret
= del_balance_item(fs_info
->tree_root
);
3187 btrfs_std_error(fs_info
, ret
);
3189 atomic_set(&fs_info
->mutually_exclusive_operation_running
, 0);
3193 * Should be called with both balance and volume mutexes held
3195 int btrfs_balance(struct btrfs_balance_control
*bctl
,
3196 struct btrfs_ioctl_balance_args
*bargs
)
3198 struct btrfs_fs_info
*fs_info
= bctl
->fs_info
;
3205 if (btrfs_fs_closing(fs_info
) ||
3206 atomic_read(&fs_info
->balance_pause_req
) ||
3207 atomic_read(&fs_info
->balance_cancel_req
)) {
3212 allowed
= btrfs_super_incompat_flags(fs_info
->super_copy
);
3213 if (allowed
& BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS
)
3217 * In case of mixed groups both data and meta should be picked,
3218 * and identical options should be given for both of them.
3220 allowed
= BTRFS_BALANCE_DATA
| BTRFS_BALANCE_METADATA
;
3221 if (mixed
&& (bctl
->flags
& allowed
)) {
3222 if (!(bctl
->flags
& BTRFS_BALANCE_DATA
) ||
3223 !(bctl
->flags
& BTRFS_BALANCE_METADATA
) ||
3224 memcmp(&bctl
->data
, &bctl
->meta
, sizeof(bctl
->data
))) {
3225 btrfs_err(fs_info
, "with mixed groups data and "
3226 "metadata balance options must be the same");
3232 num_devices
= fs_info
->fs_devices
->num_devices
;
3233 btrfs_dev_replace_lock(&fs_info
->dev_replace
);
3234 if (btrfs_dev_replace_is_ongoing(&fs_info
->dev_replace
)) {
3235 BUG_ON(num_devices
< 1);
3238 btrfs_dev_replace_unlock(&fs_info
->dev_replace
);
3239 allowed
= BTRFS_AVAIL_ALLOC_BIT_SINGLE
;
3240 if (num_devices
== 1)
3241 allowed
|= BTRFS_BLOCK_GROUP_DUP
;
3242 else if (num_devices
> 1)
3243 allowed
|= (BTRFS_BLOCK_GROUP_RAID0
| BTRFS_BLOCK_GROUP_RAID1
);
3244 if (num_devices
> 2)
3245 allowed
|= BTRFS_BLOCK_GROUP_RAID5
;
3246 if (num_devices
> 3)
3247 allowed
|= (BTRFS_BLOCK_GROUP_RAID10
|
3248 BTRFS_BLOCK_GROUP_RAID6
);
3249 if ((bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) &&
3250 (!alloc_profile_is_valid(bctl
->data
.target
, 1) ||
3251 (bctl
->data
.target
& ~allowed
))) {
3252 btrfs_err(fs_info
, "unable to start balance with target "
3253 "data profile %llu",
3258 if ((bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) &&
3259 (!alloc_profile_is_valid(bctl
->meta
.target
, 1) ||
3260 (bctl
->meta
.target
& ~allowed
))) {
3262 "unable to start balance with target metadata profile %llu",
3267 if ((bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) &&
3268 (!alloc_profile_is_valid(bctl
->sys
.target
, 1) ||
3269 (bctl
->sys
.target
& ~allowed
))) {
3271 "unable to start balance with target system profile %llu",
3277 /* allow dup'ed data chunks only in mixed mode */
3278 if (!mixed
&& (bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) &&
3279 (bctl
->data
.target
& BTRFS_BLOCK_GROUP_DUP
)) {
3280 btrfs_err(fs_info
, "dup for data is not allowed");
3285 /* allow to reduce meta or sys integrity only if force set */
3286 allowed
= BTRFS_BLOCK_GROUP_DUP
| BTRFS_BLOCK_GROUP_RAID1
|
3287 BTRFS_BLOCK_GROUP_RAID10
|
3288 BTRFS_BLOCK_GROUP_RAID5
|
3289 BTRFS_BLOCK_GROUP_RAID6
;
3291 seq
= read_seqbegin(&fs_info
->profiles_lock
);
3293 if (((bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) &&
3294 (fs_info
->avail_system_alloc_bits
& allowed
) &&
3295 !(bctl
->sys
.target
& allowed
)) ||
3296 ((bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) &&
3297 (fs_info
->avail_metadata_alloc_bits
& allowed
) &&
3298 !(bctl
->meta
.target
& allowed
))) {
3299 if (bctl
->flags
& BTRFS_BALANCE_FORCE
) {
3300 btrfs_info(fs_info
, "force reducing metadata integrity");
3302 btrfs_err(fs_info
, "balance will reduce metadata "
3303 "integrity, use force if you want this");
3308 } while (read_seqretry(&fs_info
->profiles_lock
, seq
));
3310 if (bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3311 int num_tolerated_disk_barrier_failures
;
3312 u64 target
= bctl
->sys
.target
;
3314 num_tolerated_disk_barrier_failures
=
3315 btrfs_calc_num_tolerated_disk_barrier_failures(fs_info
);
3316 if (num_tolerated_disk_barrier_failures
> 0 &&
3318 (BTRFS_BLOCK_GROUP_DUP
| BTRFS_BLOCK_GROUP_RAID0
|
3319 BTRFS_AVAIL_ALLOC_BIT_SINGLE
)))
3320 num_tolerated_disk_barrier_failures
= 0;
3321 else if (num_tolerated_disk_barrier_failures
> 1 &&
3323 (BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID10
)))
3324 num_tolerated_disk_barrier_failures
= 1;
3326 fs_info
->num_tolerated_disk_barrier_failures
=
3327 num_tolerated_disk_barrier_failures
;
3330 ret
= insert_balance_item(fs_info
->tree_root
, bctl
);
3331 if (ret
&& ret
!= -EEXIST
)
3334 if (!(bctl
->flags
& BTRFS_BALANCE_RESUME
)) {
3335 BUG_ON(ret
== -EEXIST
);
3336 set_balance_control(bctl
);
3338 BUG_ON(ret
!= -EEXIST
);
3339 spin_lock(&fs_info
->balance_lock
);
3340 update_balance_args(bctl
);
3341 spin_unlock(&fs_info
->balance_lock
);
3344 atomic_inc(&fs_info
->balance_running
);
3345 mutex_unlock(&fs_info
->balance_mutex
);
3347 ret
= __btrfs_balance(fs_info
);
3349 mutex_lock(&fs_info
->balance_mutex
);
3350 atomic_dec(&fs_info
->balance_running
);
3352 if (bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3353 fs_info
->num_tolerated_disk_barrier_failures
=
3354 btrfs_calc_num_tolerated_disk_barrier_failures(fs_info
);
3358 memset(bargs
, 0, sizeof(*bargs
));
3359 update_ioctl_balance_args(fs_info
, 0, bargs
);
3362 if ((ret
&& ret
!= -ECANCELED
&& ret
!= -ENOSPC
) ||
3363 balance_need_close(fs_info
)) {
3364 __cancel_balance(fs_info
);
3367 wake_up(&fs_info
->balance_wait_q
);
3371 if (bctl
->flags
& BTRFS_BALANCE_RESUME
)
3372 __cancel_balance(fs_info
);
3375 atomic_set(&fs_info
->mutually_exclusive_operation_running
, 0);
3380 static int balance_kthread(void *data
)
3382 struct btrfs_fs_info
*fs_info
= data
;
3385 mutex_lock(&fs_info
->volume_mutex
);
3386 mutex_lock(&fs_info
->balance_mutex
);
3388 if (fs_info
->balance_ctl
) {
3389 btrfs_info(fs_info
, "continuing balance");
3390 ret
= btrfs_balance(fs_info
->balance_ctl
, NULL
);
3393 mutex_unlock(&fs_info
->balance_mutex
);
3394 mutex_unlock(&fs_info
->volume_mutex
);
3399 int btrfs_resume_balance_async(struct btrfs_fs_info
*fs_info
)
3401 struct task_struct
*tsk
;
3403 spin_lock(&fs_info
->balance_lock
);
3404 if (!fs_info
->balance_ctl
) {
3405 spin_unlock(&fs_info
->balance_lock
);
3408 spin_unlock(&fs_info
->balance_lock
);
3410 if (btrfs_test_opt(fs_info
->tree_root
, SKIP_BALANCE
)) {
3411 btrfs_info(fs_info
, "force skipping balance");
3415 tsk
= kthread_run(balance_kthread
, fs_info
, "btrfs-balance");
3416 return PTR_ERR_OR_ZERO(tsk
);
3419 int btrfs_recover_balance(struct btrfs_fs_info
*fs_info
)
3421 struct btrfs_balance_control
*bctl
;
3422 struct btrfs_balance_item
*item
;
3423 struct btrfs_disk_balance_args disk_bargs
;
3424 struct btrfs_path
*path
;
3425 struct extent_buffer
*leaf
;
3426 struct btrfs_key key
;
3429 path
= btrfs_alloc_path();
3433 key
.objectid
= BTRFS_BALANCE_OBJECTID
;
3434 key
.type
= BTRFS_BALANCE_ITEM_KEY
;
3437 ret
= btrfs_search_slot(NULL
, fs_info
->tree_root
, &key
, path
, 0, 0);
3440 if (ret
> 0) { /* ret = -ENOENT; */
3445 bctl
= kzalloc(sizeof(*bctl
), GFP_NOFS
);
3451 leaf
= path
->nodes
[0];
3452 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_balance_item
);
3454 bctl
->fs_info
= fs_info
;
3455 bctl
->flags
= btrfs_balance_flags(leaf
, item
);
3456 bctl
->flags
|= BTRFS_BALANCE_RESUME
;
3458 btrfs_balance_data(leaf
, item
, &disk_bargs
);
3459 btrfs_disk_balance_args_to_cpu(&bctl
->data
, &disk_bargs
);
3460 btrfs_balance_meta(leaf
, item
, &disk_bargs
);
3461 btrfs_disk_balance_args_to_cpu(&bctl
->meta
, &disk_bargs
);
3462 btrfs_balance_sys(leaf
, item
, &disk_bargs
);
3463 btrfs_disk_balance_args_to_cpu(&bctl
->sys
, &disk_bargs
);
3465 WARN_ON(atomic_xchg(&fs_info
->mutually_exclusive_operation_running
, 1));
3467 mutex_lock(&fs_info
->volume_mutex
);
3468 mutex_lock(&fs_info
->balance_mutex
);
3470 set_balance_control(bctl
);
3472 mutex_unlock(&fs_info
->balance_mutex
);
3473 mutex_unlock(&fs_info
->volume_mutex
);
3475 btrfs_free_path(path
);
3479 int btrfs_pause_balance(struct btrfs_fs_info
*fs_info
)
3483 mutex_lock(&fs_info
->balance_mutex
);
3484 if (!fs_info
->balance_ctl
) {
3485 mutex_unlock(&fs_info
->balance_mutex
);
3489 if (atomic_read(&fs_info
->balance_running
)) {
3490 atomic_inc(&fs_info
->balance_pause_req
);
3491 mutex_unlock(&fs_info
->balance_mutex
);
3493 wait_event(fs_info
->balance_wait_q
,
3494 atomic_read(&fs_info
->balance_running
) == 0);
3496 mutex_lock(&fs_info
->balance_mutex
);
3497 /* we are good with balance_ctl ripped off from under us */
3498 BUG_ON(atomic_read(&fs_info
->balance_running
));
3499 atomic_dec(&fs_info
->balance_pause_req
);
3504 mutex_unlock(&fs_info
->balance_mutex
);
3508 int btrfs_cancel_balance(struct btrfs_fs_info
*fs_info
)
3510 if (fs_info
->sb
->s_flags
& MS_RDONLY
)
3513 mutex_lock(&fs_info
->balance_mutex
);
3514 if (!fs_info
->balance_ctl
) {
3515 mutex_unlock(&fs_info
->balance_mutex
);
3519 atomic_inc(&fs_info
->balance_cancel_req
);
3521 * if we are running just wait and return, balance item is
3522 * deleted in btrfs_balance in this case
3524 if (atomic_read(&fs_info
->balance_running
)) {
3525 mutex_unlock(&fs_info
->balance_mutex
);
3526 wait_event(fs_info
->balance_wait_q
,
3527 atomic_read(&fs_info
->balance_running
) == 0);
3528 mutex_lock(&fs_info
->balance_mutex
);
3530 /* __cancel_balance needs volume_mutex */
3531 mutex_unlock(&fs_info
->balance_mutex
);
3532 mutex_lock(&fs_info
->volume_mutex
);
3533 mutex_lock(&fs_info
->balance_mutex
);
3535 if (fs_info
->balance_ctl
)
3536 __cancel_balance(fs_info
);
3538 mutex_unlock(&fs_info
->volume_mutex
);
3541 BUG_ON(fs_info
->balance_ctl
|| atomic_read(&fs_info
->balance_running
));
3542 atomic_dec(&fs_info
->balance_cancel_req
);
3543 mutex_unlock(&fs_info
->balance_mutex
);
3547 static int btrfs_uuid_scan_kthread(void *data
)
3549 struct btrfs_fs_info
*fs_info
= data
;
3550 struct btrfs_root
*root
= fs_info
->tree_root
;
3551 struct btrfs_key key
;
3552 struct btrfs_key max_key
;
3553 struct btrfs_path
*path
= NULL
;
3555 struct extent_buffer
*eb
;
3557 struct btrfs_root_item root_item
;
3559 struct btrfs_trans_handle
*trans
= NULL
;
3561 path
= btrfs_alloc_path();
3568 key
.type
= BTRFS_ROOT_ITEM_KEY
;
3571 max_key
.objectid
= (u64
)-1;
3572 max_key
.type
= BTRFS_ROOT_ITEM_KEY
;
3573 max_key
.offset
= (u64
)-1;
3575 path
->keep_locks
= 1;
3578 ret
= btrfs_search_forward(root
, &key
, path
, 0);
3585 if (key
.type
!= BTRFS_ROOT_ITEM_KEY
||
3586 (key
.objectid
< BTRFS_FIRST_FREE_OBJECTID
&&
3587 key
.objectid
!= BTRFS_FS_TREE_OBJECTID
) ||
3588 key
.objectid
> BTRFS_LAST_FREE_OBJECTID
)
3591 eb
= path
->nodes
[0];
3592 slot
= path
->slots
[0];
3593 item_size
= btrfs_item_size_nr(eb
, slot
);
3594 if (item_size
< sizeof(root_item
))
3597 read_extent_buffer(eb
, &root_item
,
3598 btrfs_item_ptr_offset(eb
, slot
),
3599 (int)sizeof(root_item
));
3600 if (btrfs_root_refs(&root_item
) == 0)
3603 if (!btrfs_is_empty_uuid(root_item
.uuid
) ||
3604 !btrfs_is_empty_uuid(root_item
.received_uuid
)) {
3608 btrfs_release_path(path
);
3610 * 1 - subvol uuid item
3611 * 1 - received_subvol uuid item
3613 trans
= btrfs_start_transaction(fs_info
->uuid_root
, 2);
3614 if (IS_ERR(trans
)) {
3615 ret
= PTR_ERR(trans
);
3623 if (!btrfs_is_empty_uuid(root_item
.uuid
)) {
3624 ret
= btrfs_uuid_tree_add(trans
, fs_info
->uuid_root
,
3626 BTRFS_UUID_KEY_SUBVOL
,
3629 btrfs_warn(fs_info
, "uuid_tree_add failed %d",
3635 if (!btrfs_is_empty_uuid(root_item
.received_uuid
)) {
3636 ret
= btrfs_uuid_tree_add(trans
, fs_info
->uuid_root
,
3637 root_item
.received_uuid
,
3638 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
3641 btrfs_warn(fs_info
, "uuid_tree_add failed %d",
3649 ret
= btrfs_end_transaction(trans
, fs_info
->uuid_root
);
3655 btrfs_release_path(path
);
3656 if (key
.offset
< (u64
)-1) {
3658 } else if (key
.type
< BTRFS_ROOT_ITEM_KEY
) {
3660 key
.type
= BTRFS_ROOT_ITEM_KEY
;
3661 } else if (key
.objectid
< (u64
)-1) {
3663 key
.type
= BTRFS_ROOT_ITEM_KEY
;
3672 btrfs_free_path(path
);
3673 if (trans
&& !IS_ERR(trans
))
3674 btrfs_end_transaction(trans
, fs_info
->uuid_root
);
3676 btrfs_warn(fs_info
, "btrfs_uuid_scan_kthread failed %d", ret
);
3678 fs_info
->update_uuid_tree_gen
= 1;
3679 up(&fs_info
->uuid_tree_rescan_sem
);
3684 * Callback for btrfs_uuid_tree_iterate().
3686 * 0 check succeeded, the entry is not outdated.
3687 * < 0 if an error occured.
3688 * > 0 if the check failed, which means the caller shall remove the entry.
3690 static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info
*fs_info
,
3691 u8
*uuid
, u8 type
, u64 subid
)
3693 struct btrfs_key key
;
3695 struct btrfs_root
*subvol_root
;
3697 if (type
!= BTRFS_UUID_KEY_SUBVOL
&&
3698 type
!= BTRFS_UUID_KEY_RECEIVED_SUBVOL
)
3701 key
.objectid
= subid
;
3702 key
.type
= BTRFS_ROOT_ITEM_KEY
;
3703 key
.offset
= (u64
)-1;
3704 subvol_root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
3705 if (IS_ERR(subvol_root
)) {
3706 ret
= PTR_ERR(subvol_root
);
3713 case BTRFS_UUID_KEY_SUBVOL
:
3714 if (memcmp(uuid
, subvol_root
->root_item
.uuid
, BTRFS_UUID_SIZE
))
3717 case BTRFS_UUID_KEY_RECEIVED_SUBVOL
:
3718 if (memcmp(uuid
, subvol_root
->root_item
.received_uuid
,
3728 static int btrfs_uuid_rescan_kthread(void *data
)
3730 struct btrfs_fs_info
*fs_info
= (struct btrfs_fs_info
*)data
;
3734 * 1st step is to iterate through the existing UUID tree and
3735 * to delete all entries that contain outdated data.
3736 * 2nd step is to add all missing entries to the UUID tree.
3738 ret
= btrfs_uuid_tree_iterate(fs_info
, btrfs_check_uuid_tree_entry
);
3740 btrfs_warn(fs_info
, "iterating uuid_tree failed %d", ret
);
3741 up(&fs_info
->uuid_tree_rescan_sem
);
3744 return btrfs_uuid_scan_kthread(data
);
3747 int btrfs_create_uuid_tree(struct btrfs_fs_info
*fs_info
)
3749 struct btrfs_trans_handle
*trans
;
3750 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
3751 struct btrfs_root
*uuid_root
;
3752 struct task_struct
*task
;
3759 trans
= btrfs_start_transaction(tree_root
, 2);
3761 return PTR_ERR(trans
);
3763 uuid_root
= btrfs_create_tree(trans
, fs_info
,
3764 BTRFS_UUID_TREE_OBJECTID
);
3765 if (IS_ERR(uuid_root
)) {
3766 btrfs_abort_transaction(trans
, tree_root
,
3767 PTR_ERR(uuid_root
));
3768 return PTR_ERR(uuid_root
);
3771 fs_info
->uuid_root
= uuid_root
;
3773 ret
= btrfs_commit_transaction(trans
, tree_root
);
3777 down(&fs_info
->uuid_tree_rescan_sem
);
3778 task
= kthread_run(btrfs_uuid_scan_kthread
, fs_info
, "btrfs-uuid");
3780 /* fs_info->update_uuid_tree_gen remains 0 in all error case */
3781 btrfs_warn(fs_info
, "failed to start uuid_scan task");
3782 up(&fs_info
->uuid_tree_rescan_sem
);
3783 return PTR_ERR(task
);
3789 int btrfs_check_uuid_tree(struct btrfs_fs_info
*fs_info
)
3791 struct task_struct
*task
;
3793 down(&fs_info
->uuid_tree_rescan_sem
);
3794 task
= kthread_run(btrfs_uuid_rescan_kthread
, fs_info
, "btrfs-uuid");
3796 /* fs_info->update_uuid_tree_gen remains 0 in all error case */
3797 btrfs_warn(fs_info
, "failed to start uuid_rescan task");
3798 up(&fs_info
->uuid_tree_rescan_sem
);
3799 return PTR_ERR(task
);
3806 * shrinking a device means finding all of the device extents past
3807 * the new size, and then following the back refs to the chunks.
3808 * The chunk relocation code actually frees the device extent
3810 int btrfs_shrink_device(struct btrfs_device
*device
, u64 new_size
)
3812 struct btrfs_trans_handle
*trans
;
3813 struct btrfs_root
*root
= device
->dev_root
;
3814 struct btrfs_dev_extent
*dev_extent
= NULL
;
3815 struct btrfs_path
*path
;
3823 bool retried
= false;
3824 struct extent_buffer
*l
;
3825 struct btrfs_key key
;
3826 struct btrfs_super_block
*super_copy
= root
->fs_info
->super_copy
;
3827 u64 old_total
= btrfs_super_total_bytes(super_copy
);
3828 u64 old_size
= device
->total_bytes
;
3829 u64 diff
= device
->total_bytes
- new_size
;
3831 if (device
->is_tgtdev_for_dev_replace
)
3834 path
= btrfs_alloc_path();
3842 device
->total_bytes
= new_size
;
3843 if (device
->writeable
) {
3844 device
->fs_devices
->total_rw_bytes
-= diff
;
3845 spin_lock(&root
->fs_info
->free_chunk_lock
);
3846 root
->fs_info
->free_chunk_space
-= diff
;
3847 spin_unlock(&root
->fs_info
->free_chunk_lock
);
3849 unlock_chunks(root
);
3852 key
.objectid
= device
->devid
;
3853 key
.offset
= (u64
)-1;
3854 key
.type
= BTRFS_DEV_EXTENT_KEY
;
3857 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
3861 ret
= btrfs_previous_item(root
, path
, 0, key
.type
);
3866 btrfs_release_path(path
);
3871 slot
= path
->slots
[0];
3872 btrfs_item_key_to_cpu(l
, &key
, path
->slots
[0]);
3874 if (key
.objectid
!= device
->devid
) {
3875 btrfs_release_path(path
);
3879 dev_extent
= btrfs_item_ptr(l
, slot
, struct btrfs_dev_extent
);
3880 length
= btrfs_dev_extent_length(l
, dev_extent
);
3882 if (key
.offset
+ length
<= new_size
) {
3883 btrfs_release_path(path
);
3887 chunk_tree
= btrfs_dev_extent_chunk_tree(l
, dev_extent
);
3888 chunk_objectid
= btrfs_dev_extent_chunk_objectid(l
, dev_extent
);
3889 chunk_offset
= btrfs_dev_extent_chunk_offset(l
, dev_extent
);
3890 btrfs_release_path(path
);
3892 ret
= btrfs_relocate_chunk(root
, chunk_tree
, chunk_objectid
,
3894 if (ret
&& ret
!= -ENOSPC
)
3898 } while (key
.offset
-- > 0);
3900 if (failed
&& !retried
) {
3904 } else if (failed
&& retried
) {
3908 device
->total_bytes
= old_size
;
3909 if (device
->writeable
)
3910 device
->fs_devices
->total_rw_bytes
+= diff
;
3911 spin_lock(&root
->fs_info
->free_chunk_lock
);
3912 root
->fs_info
->free_chunk_space
+= diff
;
3913 spin_unlock(&root
->fs_info
->free_chunk_lock
);
3914 unlock_chunks(root
);
3918 /* Shrinking succeeded, else we would be at "done". */
3919 trans
= btrfs_start_transaction(root
, 0);
3920 if (IS_ERR(trans
)) {
3921 ret
= PTR_ERR(trans
);
3927 device
->disk_total_bytes
= new_size
;
3928 /* Now btrfs_update_device() will change the on-disk size. */
3929 ret
= btrfs_update_device(trans
, device
);
3931 unlock_chunks(root
);
3932 btrfs_end_transaction(trans
, root
);
3935 WARN_ON(diff
> old_total
);
3936 btrfs_set_super_total_bytes(super_copy
, old_total
- diff
);
3937 unlock_chunks(root
);
3938 btrfs_end_transaction(trans
, root
);
3940 btrfs_free_path(path
);
3944 static int btrfs_add_system_chunk(struct btrfs_root
*root
,
3945 struct btrfs_key
*key
,
3946 struct btrfs_chunk
*chunk
, int item_size
)
3948 struct btrfs_super_block
*super_copy
= root
->fs_info
->super_copy
;
3949 struct btrfs_disk_key disk_key
;
3953 array_size
= btrfs_super_sys_array_size(super_copy
);
3954 if (array_size
+ item_size
+ sizeof(disk_key
)
3955 > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE
)
3958 ptr
= super_copy
->sys_chunk_array
+ array_size
;
3959 btrfs_cpu_key_to_disk(&disk_key
, key
);
3960 memcpy(ptr
, &disk_key
, sizeof(disk_key
));
3961 ptr
+= sizeof(disk_key
);
3962 memcpy(ptr
, chunk
, item_size
);
3963 item_size
+= sizeof(disk_key
);
3964 btrfs_set_super_sys_array_size(super_copy
, array_size
+ item_size
);
3969 * sort the devices in descending order by max_avail, total_avail
3971 static int btrfs_cmp_device_info(const void *a
, const void *b
)
3973 const struct btrfs_device_info
*di_a
= a
;
3974 const struct btrfs_device_info
*di_b
= b
;
3976 if (di_a
->max_avail
> di_b
->max_avail
)
3978 if (di_a
->max_avail
< di_b
->max_avail
)
3980 if (di_a
->total_avail
> di_b
->total_avail
)
3982 if (di_a
->total_avail
< di_b
->total_avail
)
3987 static struct btrfs_raid_attr btrfs_raid_array
[BTRFS_NR_RAID_TYPES
] = {
3988 [BTRFS_RAID_RAID10
] = {
3991 .devs_max
= 0, /* 0 == as many as possible */
3993 .devs_increment
= 2,
3996 [BTRFS_RAID_RAID1
] = {
4001 .devs_increment
= 2,
4004 [BTRFS_RAID_DUP
] = {
4009 .devs_increment
= 1,
4012 [BTRFS_RAID_RAID0
] = {
4017 .devs_increment
= 1,
4020 [BTRFS_RAID_SINGLE
] = {
4025 .devs_increment
= 1,
4028 [BTRFS_RAID_RAID5
] = {
4033 .devs_increment
= 1,
4036 [BTRFS_RAID_RAID6
] = {
4041 .devs_increment
= 1,
4046 static u32
find_raid56_stripe_len(u32 data_devices
, u32 dev_stripe_target
)
4048 /* TODO allow them to set a preferred stripe size */
4052 static void check_raid56_incompat_flag(struct btrfs_fs_info
*info
, u64 type
)
4054 if (!(type
& (BTRFS_BLOCK_GROUP_RAID5
| BTRFS_BLOCK_GROUP_RAID6
)))
4057 btrfs_set_fs_incompat(info
, RAID56
);
4060 #define BTRFS_MAX_DEVS(r) ((BTRFS_LEAF_DATA_SIZE(r) \
4061 - sizeof(struct btrfs_item) \
4062 - sizeof(struct btrfs_chunk)) \
4063 / sizeof(struct btrfs_stripe) + 1)
4065 #define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \
4066 - 2 * sizeof(struct btrfs_disk_key) \
4067 - 2 * sizeof(struct btrfs_chunk)) \
4068 / sizeof(struct btrfs_stripe) + 1)
4070 static int __btrfs_alloc_chunk(struct btrfs_trans_handle
*trans
,
4071 struct btrfs_root
*extent_root
, u64 start
,
4074 struct btrfs_fs_info
*info
= extent_root
->fs_info
;
4075 struct btrfs_fs_devices
*fs_devices
= info
->fs_devices
;
4076 struct list_head
*cur
;
4077 struct map_lookup
*map
= NULL
;
4078 struct extent_map_tree
*em_tree
;
4079 struct extent_map
*em
;
4080 struct btrfs_device_info
*devices_info
= NULL
;
4082 int num_stripes
; /* total number of stripes to allocate */
4083 int data_stripes
; /* number of stripes that count for
4085 int sub_stripes
; /* sub_stripes info for map */
4086 int dev_stripes
; /* stripes per dev */
4087 int devs_max
; /* max devs to use */
4088 int devs_min
; /* min devs needed */
4089 int devs_increment
; /* ndevs has to be a multiple of this */
4090 int ncopies
; /* how many copies to data has */
4092 u64 max_stripe_size
;
4096 u64 raid_stripe_len
= BTRFS_STRIPE_LEN
;
4102 BUG_ON(!alloc_profile_is_valid(type
, 0));
4104 if (list_empty(&fs_devices
->alloc_list
))
4107 index
= __get_raid_index(type
);
4109 sub_stripes
= btrfs_raid_array
[index
].sub_stripes
;
4110 dev_stripes
= btrfs_raid_array
[index
].dev_stripes
;
4111 devs_max
= btrfs_raid_array
[index
].devs_max
;
4112 devs_min
= btrfs_raid_array
[index
].devs_min
;
4113 devs_increment
= btrfs_raid_array
[index
].devs_increment
;
4114 ncopies
= btrfs_raid_array
[index
].ncopies
;
4116 if (type
& BTRFS_BLOCK_GROUP_DATA
) {
4117 max_stripe_size
= 1024 * 1024 * 1024;
4118 max_chunk_size
= 10 * max_stripe_size
;
4120 devs_max
= BTRFS_MAX_DEVS(info
->chunk_root
);
4121 } else if (type
& BTRFS_BLOCK_GROUP_METADATA
) {
4122 /* for larger filesystems, use larger metadata chunks */
4123 if (fs_devices
->total_rw_bytes
> 50ULL * 1024 * 1024 * 1024)
4124 max_stripe_size
= 1024 * 1024 * 1024;
4126 max_stripe_size
= 256 * 1024 * 1024;
4127 max_chunk_size
= max_stripe_size
;
4129 devs_max
= BTRFS_MAX_DEVS(info
->chunk_root
);
4130 } else if (type
& BTRFS_BLOCK_GROUP_SYSTEM
) {
4131 max_stripe_size
= 32 * 1024 * 1024;
4132 max_chunk_size
= 2 * max_stripe_size
;
4134 devs_max
= BTRFS_MAX_DEVS_SYS_CHUNK
;
4136 btrfs_err(info
, "invalid chunk type 0x%llx requested\n",
4141 /* we don't want a chunk larger than 10% of writeable space */
4142 max_chunk_size
= min(div_factor(fs_devices
->total_rw_bytes
, 1),
4145 devices_info
= kzalloc(sizeof(*devices_info
) * fs_devices
->rw_devices
,
4150 cur
= fs_devices
->alloc_list
.next
;
4153 * in the first pass through the devices list, we gather information
4154 * about the available holes on each device.
4157 while (cur
!= &fs_devices
->alloc_list
) {
4158 struct btrfs_device
*device
;
4162 device
= list_entry(cur
, struct btrfs_device
, dev_alloc_list
);
4166 if (!device
->writeable
) {
4168 "BTRFS: read-only device in alloc_list\n");
4172 if (!device
->in_fs_metadata
||
4173 device
->is_tgtdev_for_dev_replace
)
4176 if (device
->total_bytes
> device
->bytes_used
)
4177 total_avail
= device
->total_bytes
- device
->bytes_used
;
4181 /* If there is no space on this device, skip it. */
4182 if (total_avail
== 0)
4185 ret
= find_free_dev_extent(trans
, device
,
4186 max_stripe_size
* dev_stripes
,
4187 &dev_offset
, &max_avail
);
4188 if (ret
&& ret
!= -ENOSPC
)
4192 max_avail
= max_stripe_size
* dev_stripes
;
4194 if (max_avail
< BTRFS_STRIPE_LEN
* dev_stripes
)
4197 if (ndevs
== fs_devices
->rw_devices
) {
4198 WARN(1, "%s: found more than %llu devices\n",
4199 __func__
, fs_devices
->rw_devices
);
4202 devices_info
[ndevs
].dev_offset
= dev_offset
;
4203 devices_info
[ndevs
].max_avail
= max_avail
;
4204 devices_info
[ndevs
].total_avail
= total_avail
;
4205 devices_info
[ndevs
].dev
= device
;
4210 * now sort the devices by hole size / available space
4212 sort(devices_info
, ndevs
, sizeof(struct btrfs_device_info
),
4213 btrfs_cmp_device_info
, NULL
);
4215 /* round down to number of usable stripes */
4216 ndevs
-= ndevs
% devs_increment
;
4218 if (ndevs
< devs_increment
* sub_stripes
|| ndevs
< devs_min
) {
4223 if (devs_max
&& ndevs
> devs_max
)
4226 * the primary goal is to maximize the number of stripes, so use as many
4227 * devices as possible, even if the stripes are not maximum sized.
4229 stripe_size
= devices_info
[ndevs
-1].max_avail
;
4230 num_stripes
= ndevs
* dev_stripes
;
4233 * this will have to be fixed for RAID1 and RAID10 over
4236 data_stripes
= num_stripes
/ ncopies
;
4238 if (type
& BTRFS_BLOCK_GROUP_RAID5
) {
4239 raid_stripe_len
= find_raid56_stripe_len(ndevs
- 1,
4240 btrfs_super_stripesize(info
->super_copy
));
4241 data_stripes
= num_stripes
- 1;
4243 if (type
& BTRFS_BLOCK_GROUP_RAID6
) {
4244 raid_stripe_len
= find_raid56_stripe_len(ndevs
- 2,
4245 btrfs_super_stripesize(info
->super_copy
));
4246 data_stripes
= num_stripes
- 2;
4250 * Use the number of data stripes to figure out how big this chunk
4251 * is really going to be in terms of logical address space,
4252 * and compare that answer with the max chunk size
4254 if (stripe_size
* data_stripes
> max_chunk_size
) {
4255 u64 mask
= (1ULL << 24) - 1;
4256 stripe_size
= max_chunk_size
;
4257 do_div(stripe_size
, data_stripes
);
4259 /* bump the answer up to a 16MB boundary */
4260 stripe_size
= (stripe_size
+ mask
) & ~mask
;
4262 /* but don't go higher than the limits we found
4263 * while searching for free extents
4265 if (stripe_size
> devices_info
[ndevs
-1].max_avail
)
4266 stripe_size
= devices_info
[ndevs
-1].max_avail
;
4269 do_div(stripe_size
, dev_stripes
);
4271 /* align to BTRFS_STRIPE_LEN */
4272 do_div(stripe_size
, raid_stripe_len
);
4273 stripe_size
*= raid_stripe_len
;
4275 map
= kmalloc(map_lookup_size(num_stripes
), GFP_NOFS
);
4280 map
->num_stripes
= num_stripes
;
4282 for (i
= 0; i
< ndevs
; ++i
) {
4283 for (j
= 0; j
< dev_stripes
; ++j
) {
4284 int s
= i
* dev_stripes
+ j
;
4285 map
->stripes
[s
].dev
= devices_info
[i
].dev
;
4286 map
->stripes
[s
].physical
= devices_info
[i
].dev_offset
+
4290 map
->sector_size
= extent_root
->sectorsize
;
4291 map
->stripe_len
= raid_stripe_len
;
4292 map
->io_align
= raid_stripe_len
;
4293 map
->io_width
= raid_stripe_len
;
4295 map
->sub_stripes
= sub_stripes
;
4297 num_bytes
= stripe_size
* data_stripes
;
4299 trace_btrfs_chunk_alloc(info
->chunk_root
, map
, start
, num_bytes
);
4301 em
= alloc_extent_map();
4306 em
->bdev
= (struct block_device
*)map
;
4308 em
->len
= num_bytes
;
4309 em
->block_start
= 0;
4310 em
->block_len
= em
->len
;
4311 em
->orig_block_len
= stripe_size
;
4313 em_tree
= &extent_root
->fs_info
->mapping_tree
.map_tree
;
4314 write_lock(&em_tree
->lock
);
4315 ret
= add_extent_mapping(em_tree
, em
, 0);
4317 list_add_tail(&em
->list
, &trans
->transaction
->pending_chunks
);
4318 atomic_inc(&em
->refs
);
4320 write_unlock(&em_tree
->lock
);
4322 free_extent_map(em
);
4326 ret
= btrfs_make_block_group(trans
, extent_root
, 0, type
,
4327 BTRFS_FIRST_CHUNK_TREE_OBJECTID
,
4330 goto error_del_extent
;
4332 free_extent_map(em
);
4333 check_raid56_incompat_flag(extent_root
->fs_info
, type
);
4335 kfree(devices_info
);
4339 write_lock(&em_tree
->lock
);
4340 remove_extent_mapping(em_tree
, em
);
4341 write_unlock(&em_tree
->lock
);
4343 /* One for our allocation */
4344 free_extent_map(em
);
4345 /* One for the tree reference */
4346 free_extent_map(em
);
4349 kfree(devices_info
);
4353 int btrfs_finish_chunk_alloc(struct btrfs_trans_handle
*trans
,
4354 struct btrfs_root
*extent_root
,
4355 u64 chunk_offset
, u64 chunk_size
)
4357 struct btrfs_key key
;
4358 struct btrfs_root
*chunk_root
= extent_root
->fs_info
->chunk_root
;
4359 struct btrfs_device
*device
;
4360 struct btrfs_chunk
*chunk
;
4361 struct btrfs_stripe
*stripe
;
4362 struct extent_map_tree
*em_tree
;
4363 struct extent_map
*em
;
4364 struct map_lookup
*map
;
4371 em_tree
= &extent_root
->fs_info
->mapping_tree
.map_tree
;
4372 read_lock(&em_tree
->lock
);
4373 em
= lookup_extent_mapping(em_tree
, chunk_offset
, chunk_size
);
4374 read_unlock(&em_tree
->lock
);
4377 btrfs_crit(extent_root
->fs_info
, "unable to find logical "
4378 "%Lu len %Lu", chunk_offset
, chunk_size
);
4382 if (em
->start
!= chunk_offset
|| em
->len
!= chunk_size
) {
4383 btrfs_crit(extent_root
->fs_info
, "found a bad mapping, wanted"
4384 " %Lu-%Lu, found %Lu-%Lu\n", chunk_offset
,
4385 chunk_size
, em
->start
, em
->len
);
4386 free_extent_map(em
);
4390 map
= (struct map_lookup
*)em
->bdev
;
4391 item_size
= btrfs_chunk_item_size(map
->num_stripes
);
4392 stripe_size
= em
->orig_block_len
;
4394 chunk
= kzalloc(item_size
, GFP_NOFS
);
4400 for (i
= 0; i
< map
->num_stripes
; i
++) {
4401 device
= map
->stripes
[i
].dev
;
4402 dev_offset
= map
->stripes
[i
].physical
;
4404 device
->bytes_used
+= stripe_size
;
4405 ret
= btrfs_update_device(trans
, device
);
4408 ret
= btrfs_alloc_dev_extent(trans
, device
,
4409 chunk_root
->root_key
.objectid
,
4410 BTRFS_FIRST_CHUNK_TREE_OBJECTID
,
4411 chunk_offset
, dev_offset
,
4417 spin_lock(&extent_root
->fs_info
->free_chunk_lock
);
4418 extent_root
->fs_info
->free_chunk_space
-= (stripe_size
*
4420 spin_unlock(&extent_root
->fs_info
->free_chunk_lock
);
4422 stripe
= &chunk
->stripe
;
4423 for (i
= 0; i
< map
->num_stripes
; i
++) {
4424 device
= map
->stripes
[i
].dev
;
4425 dev_offset
= map
->stripes
[i
].physical
;
4427 btrfs_set_stack_stripe_devid(stripe
, device
->devid
);
4428 btrfs_set_stack_stripe_offset(stripe
, dev_offset
);
4429 memcpy(stripe
->dev_uuid
, device
->uuid
, BTRFS_UUID_SIZE
);
4433 btrfs_set_stack_chunk_length(chunk
, chunk_size
);
4434 btrfs_set_stack_chunk_owner(chunk
, extent_root
->root_key
.objectid
);
4435 btrfs_set_stack_chunk_stripe_len(chunk
, map
->stripe_len
);
4436 btrfs_set_stack_chunk_type(chunk
, map
->type
);
4437 btrfs_set_stack_chunk_num_stripes(chunk
, map
->num_stripes
);
4438 btrfs_set_stack_chunk_io_align(chunk
, map
->stripe_len
);
4439 btrfs_set_stack_chunk_io_width(chunk
, map
->stripe_len
);
4440 btrfs_set_stack_chunk_sector_size(chunk
, extent_root
->sectorsize
);
4441 btrfs_set_stack_chunk_sub_stripes(chunk
, map
->sub_stripes
);
4443 key
.objectid
= BTRFS_FIRST_CHUNK_TREE_OBJECTID
;
4444 key
.type
= BTRFS_CHUNK_ITEM_KEY
;
4445 key
.offset
= chunk_offset
;
4447 ret
= btrfs_insert_item(trans
, chunk_root
, &key
, chunk
, item_size
);
4448 if (ret
== 0 && map
->type
& BTRFS_BLOCK_GROUP_SYSTEM
) {
4450 * TODO: Cleanup of inserted chunk root in case of
4453 ret
= btrfs_add_system_chunk(chunk_root
, &key
, chunk
,
4459 free_extent_map(em
);
4464 * Chunk allocation falls into two parts. The first part does works
4465 * that make the new allocated chunk useable, but not do any operation
4466 * that modifies the chunk tree. The second part does the works that
4467 * require modifying the chunk tree. This division is important for the
4468 * bootstrap process of adding storage to a seed btrfs.
4470 int btrfs_alloc_chunk(struct btrfs_trans_handle
*trans
,
4471 struct btrfs_root
*extent_root
, u64 type
)
4475 chunk_offset
= find_next_chunk(extent_root
->fs_info
);
4476 return __btrfs_alloc_chunk(trans
, extent_root
, chunk_offset
, type
);
4479 static noinline
int init_first_rw_device(struct btrfs_trans_handle
*trans
,
4480 struct btrfs_root
*root
,
4481 struct btrfs_device
*device
)
4484 u64 sys_chunk_offset
;
4486 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4487 struct btrfs_root
*extent_root
= fs_info
->extent_root
;
4490 chunk_offset
= find_next_chunk(fs_info
);
4491 alloc_profile
= btrfs_get_alloc_profile(extent_root
, 0);
4492 ret
= __btrfs_alloc_chunk(trans
, extent_root
, chunk_offset
,
4497 sys_chunk_offset
= find_next_chunk(root
->fs_info
);
4498 alloc_profile
= btrfs_get_alloc_profile(fs_info
->chunk_root
, 0);
4499 ret
= __btrfs_alloc_chunk(trans
, extent_root
, sys_chunk_offset
,
4502 btrfs_abort_transaction(trans
, root
, ret
);
4506 ret
= btrfs_add_device(trans
, fs_info
->chunk_root
, device
);
4508 btrfs_abort_transaction(trans
, root
, ret
);
4513 int btrfs_chunk_readonly(struct btrfs_root
*root
, u64 chunk_offset
)
4515 struct extent_map
*em
;
4516 struct map_lookup
*map
;
4517 struct btrfs_mapping_tree
*map_tree
= &root
->fs_info
->mapping_tree
;
4521 read_lock(&map_tree
->map_tree
.lock
);
4522 em
= lookup_extent_mapping(&map_tree
->map_tree
, chunk_offset
, 1);
4523 read_unlock(&map_tree
->map_tree
.lock
);
4527 if (btrfs_test_opt(root
, DEGRADED
)) {
4528 free_extent_map(em
);
4532 map
= (struct map_lookup
*)em
->bdev
;
4533 for (i
= 0; i
< map
->num_stripes
; i
++) {
4534 if (!map
->stripes
[i
].dev
->writeable
) {
4539 free_extent_map(em
);
4543 void btrfs_mapping_init(struct btrfs_mapping_tree
*tree
)
4545 extent_map_tree_init(&tree
->map_tree
);
4548 void btrfs_mapping_tree_free(struct btrfs_mapping_tree
*tree
)
4550 struct extent_map
*em
;
4553 write_lock(&tree
->map_tree
.lock
);
4554 em
= lookup_extent_mapping(&tree
->map_tree
, 0, (u64
)-1);
4556 remove_extent_mapping(&tree
->map_tree
, em
);
4557 write_unlock(&tree
->map_tree
.lock
);
4562 free_extent_map(em
);
4563 /* once for the tree */
4564 free_extent_map(em
);
4568 int btrfs_num_copies(struct btrfs_fs_info
*fs_info
, u64 logical
, u64 len
)
4570 struct btrfs_mapping_tree
*map_tree
= &fs_info
->mapping_tree
;
4571 struct extent_map
*em
;
4572 struct map_lookup
*map
;
4573 struct extent_map_tree
*em_tree
= &map_tree
->map_tree
;
4576 read_lock(&em_tree
->lock
);
4577 em
= lookup_extent_mapping(em_tree
, logical
, len
);
4578 read_unlock(&em_tree
->lock
);
4581 * We could return errors for these cases, but that could get ugly and
4582 * we'd probably do the same thing which is just not do anything else
4583 * and exit, so return 1 so the callers don't try to use other copies.
4586 btrfs_crit(fs_info
, "No mapping for %Lu-%Lu\n", logical
,
4591 if (em
->start
> logical
|| em
->start
+ em
->len
< logical
) {
4592 btrfs_crit(fs_info
, "Invalid mapping for %Lu-%Lu, got "
4593 "%Lu-%Lu\n", logical
, logical
+len
, em
->start
,
4594 em
->start
+ em
->len
);
4595 free_extent_map(em
);
4599 map
= (struct map_lookup
*)em
->bdev
;
4600 if (map
->type
& (BTRFS_BLOCK_GROUP_DUP
| BTRFS_BLOCK_GROUP_RAID1
))
4601 ret
= map
->num_stripes
;
4602 else if (map
->type
& BTRFS_BLOCK_GROUP_RAID10
)
4603 ret
= map
->sub_stripes
;
4604 else if (map
->type
& BTRFS_BLOCK_GROUP_RAID5
)
4606 else if (map
->type
& BTRFS_BLOCK_GROUP_RAID6
)
4610 free_extent_map(em
);
4612 btrfs_dev_replace_lock(&fs_info
->dev_replace
);
4613 if (btrfs_dev_replace_is_ongoing(&fs_info
->dev_replace
))
4615 btrfs_dev_replace_unlock(&fs_info
->dev_replace
);
4620 unsigned long btrfs_full_stripe_len(struct btrfs_root
*root
,
4621 struct btrfs_mapping_tree
*map_tree
,
4624 struct extent_map
*em
;
4625 struct map_lookup
*map
;
4626 struct extent_map_tree
*em_tree
= &map_tree
->map_tree
;
4627 unsigned long len
= root
->sectorsize
;
4629 read_lock(&em_tree
->lock
);
4630 em
= lookup_extent_mapping(em_tree
, logical
, len
);
4631 read_unlock(&em_tree
->lock
);
4634 BUG_ON(em
->start
> logical
|| em
->start
+ em
->len
< logical
);
4635 map
= (struct map_lookup
*)em
->bdev
;
4636 if (map
->type
& (BTRFS_BLOCK_GROUP_RAID5
|
4637 BTRFS_BLOCK_GROUP_RAID6
)) {
4638 len
= map
->stripe_len
* nr_data_stripes(map
);
4640 free_extent_map(em
);
4644 int btrfs_is_parity_mirror(struct btrfs_mapping_tree
*map_tree
,
4645 u64 logical
, u64 len
, int mirror_num
)
4647 struct extent_map
*em
;
4648 struct map_lookup
*map
;
4649 struct extent_map_tree
*em_tree
= &map_tree
->map_tree
;
4652 read_lock(&em_tree
->lock
);
4653 em
= lookup_extent_mapping(em_tree
, logical
, len
);
4654 read_unlock(&em_tree
->lock
);
4657 BUG_ON(em
->start
> logical
|| em
->start
+ em
->len
< logical
);
4658 map
= (struct map_lookup
*)em
->bdev
;
4659 if (map
->type
& (BTRFS_BLOCK_GROUP_RAID5
|
4660 BTRFS_BLOCK_GROUP_RAID6
))
4662 free_extent_map(em
);
4666 static int find_live_mirror(struct btrfs_fs_info
*fs_info
,
4667 struct map_lookup
*map
, int first
, int num
,
4668 int optimal
, int dev_replace_is_ongoing
)
4672 struct btrfs_device
*srcdev
;
4674 if (dev_replace_is_ongoing
&&
4675 fs_info
->dev_replace
.cont_reading_from_srcdev_mode
==
4676 BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID
)
4677 srcdev
= fs_info
->dev_replace
.srcdev
;
4682 * try to avoid the drive that is the source drive for a
4683 * dev-replace procedure, only choose it if no other non-missing
4684 * mirror is available
4686 for (tolerance
= 0; tolerance
< 2; tolerance
++) {
4687 if (map
->stripes
[optimal
].dev
->bdev
&&
4688 (tolerance
|| map
->stripes
[optimal
].dev
!= srcdev
))
4690 for (i
= first
; i
< first
+ num
; i
++) {
4691 if (map
->stripes
[i
].dev
->bdev
&&
4692 (tolerance
|| map
->stripes
[i
].dev
!= srcdev
))
4697 /* we couldn't find one that doesn't fail. Just return something
4698 * and the io error handling code will clean up eventually
4703 static inline int parity_smaller(u64 a
, u64 b
)
4708 /* Bubble-sort the stripe set to put the parity/syndrome stripes last */
4709 static void sort_parity_stripes(struct btrfs_bio
*bbio
, u64
*raid_map
)
4711 struct btrfs_bio_stripe s
;
4718 for (i
= 0; i
< bbio
->num_stripes
- 1; i
++) {
4719 if (parity_smaller(raid_map
[i
], raid_map
[i
+1])) {
4720 s
= bbio
->stripes
[i
];
4722 bbio
->stripes
[i
] = bbio
->stripes
[i
+1];
4723 raid_map
[i
] = raid_map
[i
+1];
4724 bbio
->stripes
[i
+1] = s
;
4732 static int __btrfs_map_block(struct btrfs_fs_info
*fs_info
, int rw
,
4733 u64 logical
, u64
*length
,
4734 struct btrfs_bio
**bbio_ret
,
4735 int mirror_num
, u64
**raid_map_ret
)
4737 struct extent_map
*em
;
4738 struct map_lookup
*map
;
4739 struct btrfs_mapping_tree
*map_tree
= &fs_info
->mapping_tree
;
4740 struct extent_map_tree
*em_tree
= &map_tree
->map_tree
;
4743 u64 stripe_end_offset
;
4748 u64
*raid_map
= NULL
;
4754 struct btrfs_bio
*bbio
= NULL
;
4755 struct btrfs_dev_replace
*dev_replace
= &fs_info
->dev_replace
;
4756 int dev_replace_is_ongoing
= 0;
4757 int num_alloc_stripes
;
4758 int patch_the_first_stripe_for_dev_replace
= 0;
4759 u64 physical_to_patch_in_first_stripe
= 0;
4760 u64 raid56_full_stripe_start
= (u64
)-1;
4762 read_lock(&em_tree
->lock
);
4763 em
= lookup_extent_mapping(em_tree
, logical
, *length
);
4764 read_unlock(&em_tree
->lock
);
4767 btrfs_crit(fs_info
, "unable to find logical %llu len %llu",
4772 if (em
->start
> logical
|| em
->start
+ em
->len
< logical
) {
4773 btrfs_crit(fs_info
, "found a bad mapping, wanted %Lu, "
4774 "found %Lu-%Lu\n", logical
, em
->start
,
4775 em
->start
+ em
->len
);
4776 free_extent_map(em
);
4780 map
= (struct map_lookup
*)em
->bdev
;
4781 offset
= logical
- em
->start
;
4783 stripe_len
= map
->stripe_len
;
4786 * stripe_nr counts the total number of stripes we have to stride
4787 * to get to this block
4789 do_div(stripe_nr
, stripe_len
);
4791 stripe_offset
= stripe_nr
* stripe_len
;
4792 BUG_ON(offset
< stripe_offset
);
4794 /* stripe_offset is the offset of this block in its stripe*/
4795 stripe_offset
= offset
- stripe_offset
;
4797 /* if we're here for raid56, we need to know the stripe aligned start */
4798 if (map
->type
& (BTRFS_BLOCK_GROUP_RAID5
| BTRFS_BLOCK_GROUP_RAID6
)) {
4799 unsigned long full_stripe_len
= stripe_len
* nr_data_stripes(map
);
4800 raid56_full_stripe_start
= offset
;
4802 /* allow a write of a full stripe, but make sure we don't
4803 * allow straddling of stripes
4805 do_div(raid56_full_stripe_start
, full_stripe_len
);
4806 raid56_full_stripe_start
*= full_stripe_len
;
4809 if (rw
& REQ_DISCARD
) {
4810 /* we don't discard raid56 yet */
4812 (BTRFS_BLOCK_GROUP_RAID5
| BTRFS_BLOCK_GROUP_RAID6
)) {
4816 *length
= min_t(u64
, em
->len
- offset
, *length
);
4817 } else if (map
->type
& BTRFS_BLOCK_GROUP_PROFILE_MASK
) {
4819 /* For writes to RAID[56], allow a full stripeset across all disks.
4820 For other RAID types and for RAID[56] reads, just allow a single
4821 stripe (on a single disk). */
4822 if (map
->type
& (BTRFS_BLOCK_GROUP_RAID5
| BTRFS_BLOCK_GROUP_RAID6
) &&
4824 max_len
= stripe_len
* nr_data_stripes(map
) -
4825 (offset
- raid56_full_stripe_start
);
4827 /* we limit the length of each bio to what fits in a stripe */
4828 max_len
= stripe_len
- stripe_offset
;
4830 *length
= min_t(u64
, em
->len
- offset
, max_len
);
4832 *length
= em
->len
- offset
;
4835 /* This is for when we're called from btrfs_merge_bio_hook() and all
4836 it cares about is the length */
4840 btrfs_dev_replace_lock(dev_replace
);
4841 dev_replace_is_ongoing
= btrfs_dev_replace_is_ongoing(dev_replace
);
4842 if (!dev_replace_is_ongoing
)
4843 btrfs_dev_replace_unlock(dev_replace
);
4845 if (dev_replace_is_ongoing
&& mirror_num
== map
->num_stripes
+ 1 &&
4846 !(rw
& (REQ_WRITE
| REQ_DISCARD
| REQ_GET_READ_MIRRORS
)) &&
4847 dev_replace
->tgtdev
!= NULL
) {
4849 * in dev-replace case, for repair case (that's the only
4850 * case where the mirror is selected explicitly when
4851 * calling btrfs_map_block), blocks left of the left cursor
4852 * can also be read from the target drive.
4853 * For REQ_GET_READ_MIRRORS, the target drive is added as
4854 * the last one to the array of stripes. For READ, it also
4855 * needs to be supported using the same mirror number.
4856 * If the requested block is not left of the left cursor,
4857 * EIO is returned. This can happen because btrfs_num_copies()
4858 * returns one more in the dev-replace case.
4860 u64 tmp_length
= *length
;
4861 struct btrfs_bio
*tmp_bbio
= NULL
;
4862 int tmp_num_stripes
;
4863 u64 srcdev_devid
= dev_replace
->srcdev
->devid
;
4864 int index_srcdev
= 0;
4866 u64 physical_of_found
= 0;
4868 ret
= __btrfs_map_block(fs_info
, REQ_GET_READ_MIRRORS
,
4869 logical
, &tmp_length
, &tmp_bbio
, 0, NULL
);
4871 WARN_ON(tmp_bbio
!= NULL
);
4875 tmp_num_stripes
= tmp_bbio
->num_stripes
;
4876 if (mirror_num
> tmp_num_stripes
) {
4878 * REQ_GET_READ_MIRRORS does not contain this
4879 * mirror, that means that the requested area
4880 * is not left of the left cursor
4888 * process the rest of the function using the mirror_num
4889 * of the source drive. Therefore look it up first.
4890 * At the end, patch the device pointer to the one of the
4893 for (i
= 0; i
< tmp_num_stripes
; i
++) {
4894 if (tmp_bbio
->stripes
[i
].dev
->devid
== srcdev_devid
) {
4896 * In case of DUP, in order to keep it
4897 * simple, only add the mirror with the
4898 * lowest physical address
4901 physical_of_found
<=
4902 tmp_bbio
->stripes
[i
].physical
)
4907 tmp_bbio
->stripes
[i
].physical
;
4912 mirror_num
= index_srcdev
+ 1;
4913 patch_the_first_stripe_for_dev_replace
= 1;
4914 physical_to_patch_in_first_stripe
= physical_of_found
;
4923 } else if (mirror_num
> map
->num_stripes
) {
4929 stripe_nr_orig
= stripe_nr
;
4930 stripe_nr_end
= ALIGN(offset
+ *length
, map
->stripe_len
);
4931 do_div(stripe_nr_end
, map
->stripe_len
);
4932 stripe_end_offset
= stripe_nr_end
* map
->stripe_len
-
4935 if (map
->type
& BTRFS_BLOCK_GROUP_RAID0
) {
4936 if (rw
& REQ_DISCARD
)
4937 num_stripes
= min_t(u64
, map
->num_stripes
,
4938 stripe_nr_end
- stripe_nr_orig
);
4939 stripe_index
= do_div(stripe_nr
, map
->num_stripes
);
4940 } else if (map
->type
& BTRFS_BLOCK_GROUP_RAID1
) {
4941 if (rw
& (REQ_WRITE
| REQ_DISCARD
| REQ_GET_READ_MIRRORS
))
4942 num_stripes
= map
->num_stripes
;
4943 else if (mirror_num
)
4944 stripe_index
= mirror_num
- 1;
4946 stripe_index
= find_live_mirror(fs_info
, map
, 0,
4948 current
->pid
% map
->num_stripes
,
4949 dev_replace_is_ongoing
);
4950 mirror_num
= stripe_index
+ 1;
4953 } else if (map
->type
& BTRFS_BLOCK_GROUP_DUP
) {
4954 if (rw
& (REQ_WRITE
| REQ_DISCARD
| REQ_GET_READ_MIRRORS
)) {
4955 num_stripes
= map
->num_stripes
;
4956 } else if (mirror_num
) {
4957 stripe_index
= mirror_num
- 1;
4962 } else if (map
->type
& BTRFS_BLOCK_GROUP_RAID10
) {
4963 int factor
= map
->num_stripes
/ map
->sub_stripes
;
4965 stripe_index
= do_div(stripe_nr
, factor
);
4966 stripe_index
*= map
->sub_stripes
;
4968 if (rw
& (REQ_WRITE
| REQ_GET_READ_MIRRORS
))
4969 num_stripes
= map
->sub_stripes
;
4970 else if (rw
& REQ_DISCARD
)
4971 num_stripes
= min_t(u64
, map
->sub_stripes
*
4972 (stripe_nr_end
- stripe_nr_orig
),
4974 else if (mirror_num
)
4975 stripe_index
+= mirror_num
- 1;
4977 int old_stripe_index
= stripe_index
;
4978 stripe_index
= find_live_mirror(fs_info
, map
,
4980 map
->sub_stripes
, stripe_index
+
4981 current
->pid
% map
->sub_stripes
,
4982 dev_replace_is_ongoing
);
4983 mirror_num
= stripe_index
- old_stripe_index
+ 1;
4986 } else if (map
->type
& (BTRFS_BLOCK_GROUP_RAID5
|
4987 BTRFS_BLOCK_GROUP_RAID6
)) {
4990 if (bbio_ret
&& ((rw
& REQ_WRITE
) || mirror_num
> 1)
4994 /* push stripe_nr back to the start of the full stripe */
4995 stripe_nr
= raid56_full_stripe_start
;
4996 do_div(stripe_nr
, stripe_len
);
4998 stripe_index
= do_div(stripe_nr
, nr_data_stripes(map
));
5000 /* RAID[56] write or recovery. Return all stripes */
5001 num_stripes
= map
->num_stripes
;
5002 max_errors
= nr_parity_stripes(map
);
5004 raid_map
= kmalloc_array(num_stripes
, sizeof(u64
),
5011 /* Work out the disk rotation on this stripe-set */
5013 rot
= do_div(tmp
, num_stripes
);
5015 /* Fill in the logical address of each stripe */
5016 tmp
= stripe_nr
* nr_data_stripes(map
);
5017 for (i
= 0; i
< nr_data_stripes(map
); i
++)
5018 raid_map
[(i
+rot
) % num_stripes
] =
5019 em
->start
+ (tmp
+ i
) * map
->stripe_len
;
5021 raid_map
[(i
+rot
) % map
->num_stripes
] = RAID5_P_STRIPE
;
5022 if (map
->type
& BTRFS_BLOCK_GROUP_RAID6
)
5023 raid_map
[(i
+rot
+1) % num_stripes
] =
5026 *length
= map
->stripe_len
;
5031 * Mirror #0 or #1 means the original data block.
5032 * Mirror #2 is RAID5 parity block.
5033 * Mirror #3 is RAID6 Q block.
5035 stripe_index
= do_div(stripe_nr
, nr_data_stripes(map
));
5037 stripe_index
= nr_data_stripes(map
) +
5040 /* We distribute the parity blocks across stripes */
5041 tmp
= stripe_nr
+ stripe_index
;
5042 stripe_index
= do_div(tmp
, map
->num_stripes
);
5046 * after this do_div call, stripe_nr is the number of stripes
5047 * on this device we have to walk to find the data, and
5048 * stripe_index is the number of our device in the stripe array
5050 stripe_index
= do_div(stripe_nr
, map
->num_stripes
);
5051 mirror_num
= stripe_index
+ 1;
5053 BUG_ON(stripe_index
>= map
->num_stripes
);
5055 num_alloc_stripes
= num_stripes
;
5056 if (dev_replace_is_ongoing
) {
5057 if (rw
& (REQ_WRITE
| REQ_DISCARD
))
5058 num_alloc_stripes
<<= 1;
5059 if (rw
& REQ_GET_READ_MIRRORS
)
5060 num_alloc_stripes
++;
5062 bbio
= kzalloc(btrfs_bio_size(num_alloc_stripes
), GFP_NOFS
);
5068 atomic_set(&bbio
->error
, 0);
5070 if (rw
& REQ_DISCARD
) {
5072 int sub_stripes
= 0;
5073 u64 stripes_per_dev
= 0;
5074 u32 remaining_stripes
= 0;
5075 u32 last_stripe
= 0;
5078 (BTRFS_BLOCK_GROUP_RAID0
| BTRFS_BLOCK_GROUP_RAID10
)) {
5079 if (map
->type
& BTRFS_BLOCK_GROUP_RAID0
)
5082 sub_stripes
= map
->sub_stripes
;
5084 factor
= map
->num_stripes
/ sub_stripes
;
5085 stripes_per_dev
= div_u64_rem(stripe_nr_end
-
5088 &remaining_stripes
);
5089 div_u64_rem(stripe_nr_end
- 1, factor
, &last_stripe
);
5090 last_stripe
*= sub_stripes
;
5093 for (i
= 0; i
< num_stripes
; i
++) {
5094 bbio
->stripes
[i
].physical
=
5095 map
->stripes
[stripe_index
].physical
+
5096 stripe_offset
+ stripe_nr
* map
->stripe_len
;
5097 bbio
->stripes
[i
].dev
= map
->stripes
[stripe_index
].dev
;
5099 if (map
->type
& (BTRFS_BLOCK_GROUP_RAID0
|
5100 BTRFS_BLOCK_GROUP_RAID10
)) {
5101 bbio
->stripes
[i
].length
= stripes_per_dev
*
5104 if (i
/ sub_stripes
< remaining_stripes
)
5105 bbio
->stripes
[i
].length
+=
5109 * Special for the first stripe and
5112 * |-------|...|-------|
5116 if (i
< sub_stripes
)
5117 bbio
->stripes
[i
].length
-=
5120 if (stripe_index
>= last_stripe
&&
5121 stripe_index
<= (last_stripe
+
5123 bbio
->stripes
[i
].length
-=
5126 if (i
== sub_stripes
- 1)
5129 bbio
->stripes
[i
].length
= *length
;
5132 if (stripe_index
== map
->num_stripes
) {
5133 /* This could only happen for RAID0/10 */
5139 for (i
= 0; i
< num_stripes
; i
++) {
5140 bbio
->stripes
[i
].physical
=
5141 map
->stripes
[stripe_index
].physical
+
5143 stripe_nr
* map
->stripe_len
;
5144 bbio
->stripes
[i
].dev
=
5145 map
->stripes
[stripe_index
].dev
;
5150 if (rw
& (REQ_WRITE
| REQ_GET_READ_MIRRORS
)) {
5151 if (map
->type
& (BTRFS_BLOCK_GROUP_RAID1
|
5152 BTRFS_BLOCK_GROUP_RAID10
|
5153 BTRFS_BLOCK_GROUP_RAID5
|
5154 BTRFS_BLOCK_GROUP_DUP
)) {
5156 } else if (map
->type
& BTRFS_BLOCK_GROUP_RAID6
) {
5161 if (dev_replace_is_ongoing
&& (rw
& (REQ_WRITE
| REQ_DISCARD
)) &&
5162 dev_replace
->tgtdev
!= NULL
) {
5163 int index_where_to_add
;
5164 u64 srcdev_devid
= dev_replace
->srcdev
->devid
;
5167 * duplicate the write operations while the dev replace
5168 * procedure is running. Since the copying of the old disk
5169 * to the new disk takes place at run time while the
5170 * filesystem is mounted writable, the regular write
5171 * operations to the old disk have to be duplicated to go
5172 * to the new disk as well.
5173 * Note that device->missing is handled by the caller, and
5174 * that the write to the old disk is already set up in the
5177 index_where_to_add
= num_stripes
;
5178 for (i
= 0; i
< num_stripes
; i
++) {
5179 if (bbio
->stripes
[i
].dev
->devid
== srcdev_devid
) {
5180 /* write to new disk, too */
5181 struct btrfs_bio_stripe
*new =
5182 bbio
->stripes
+ index_where_to_add
;
5183 struct btrfs_bio_stripe
*old
=
5186 new->physical
= old
->physical
;
5187 new->length
= old
->length
;
5188 new->dev
= dev_replace
->tgtdev
;
5189 index_where_to_add
++;
5193 num_stripes
= index_where_to_add
;
5194 } else if (dev_replace_is_ongoing
&& (rw
& REQ_GET_READ_MIRRORS
) &&
5195 dev_replace
->tgtdev
!= NULL
) {
5196 u64 srcdev_devid
= dev_replace
->srcdev
->devid
;
5197 int index_srcdev
= 0;
5199 u64 physical_of_found
= 0;
5202 * During the dev-replace procedure, the target drive can
5203 * also be used to read data in case it is needed to repair
5204 * a corrupt block elsewhere. This is possible if the
5205 * requested area is left of the left cursor. In this area,
5206 * the target drive is a full copy of the source drive.
5208 for (i
= 0; i
< num_stripes
; i
++) {
5209 if (bbio
->stripes
[i
].dev
->devid
== srcdev_devid
) {
5211 * In case of DUP, in order to keep it
5212 * simple, only add the mirror with the
5213 * lowest physical address
5216 physical_of_found
<=
5217 bbio
->stripes
[i
].physical
)
5221 physical_of_found
= bbio
->stripes
[i
].physical
;
5225 u64 length
= map
->stripe_len
;
5227 if (physical_of_found
+ length
<=
5228 dev_replace
->cursor_left
) {
5229 struct btrfs_bio_stripe
*tgtdev_stripe
=
5230 bbio
->stripes
+ num_stripes
;
5232 tgtdev_stripe
->physical
= physical_of_found
;
5233 tgtdev_stripe
->length
=
5234 bbio
->stripes
[index_srcdev
].length
;
5235 tgtdev_stripe
->dev
= dev_replace
->tgtdev
;
5243 bbio
->num_stripes
= num_stripes
;
5244 bbio
->max_errors
= max_errors
;
5245 bbio
->mirror_num
= mirror_num
;
5248 * this is the case that REQ_READ && dev_replace_is_ongoing &&
5249 * mirror_num == num_stripes + 1 && dev_replace target drive is
5250 * available as a mirror
5252 if (patch_the_first_stripe_for_dev_replace
&& num_stripes
> 0) {
5253 WARN_ON(num_stripes
> 1);
5254 bbio
->stripes
[0].dev
= dev_replace
->tgtdev
;
5255 bbio
->stripes
[0].physical
= physical_to_patch_in_first_stripe
;
5256 bbio
->mirror_num
= map
->num_stripes
+ 1;
5259 sort_parity_stripes(bbio
, raid_map
);
5260 *raid_map_ret
= raid_map
;
5263 if (dev_replace_is_ongoing
)
5264 btrfs_dev_replace_unlock(dev_replace
);
5265 free_extent_map(em
);
5269 int btrfs_map_block(struct btrfs_fs_info
*fs_info
, int rw
,
5270 u64 logical
, u64
*length
,
5271 struct btrfs_bio
**bbio_ret
, int mirror_num
)
5273 return __btrfs_map_block(fs_info
, rw
, logical
, length
, bbio_ret
,
5277 int btrfs_rmap_block(struct btrfs_mapping_tree
*map_tree
,
5278 u64 chunk_start
, u64 physical
, u64 devid
,
5279 u64
**logical
, int *naddrs
, int *stripe_len
)
5281 struct extent_map_tree
*em_tree
= &map_tree
->map_tree
;
5282 struct extent_map
*em
;
5283 struct map_lookup
*map
;
5291 read_lock(&em_tree
->lock
);
5292 em
= lookup_extent_mapping(em_tree
, chunk_start
, 1);
5293 read_unlock(&em_tree
->lock
);
5296 printk(KERN_ERR
"BTRFS: couldn't find em for chunk %Lu\n",
5301 if (em
->start
!= chunk_start
) {
5302 printk(KERN_ERR
"BTRFS: bad chunk start, em=%Lu, wanted=%Lu\n",
5303 em
->start
, chunk_start
);
5304 free_extent_map(em
);
5307 map
= (struct map_lookup
*)em
->bdev
;
5310 rmap_len
= map
->stripe_len
;
5312 if (map
->type
& BTRFS_BLOCK_GROUP_RAID10
)
5313 do_div(length
, map
->num_stripes
/ map
->sub_stripes
);
5314 else if (map
->type
& BTRFS_BLOCK_GROUP_RAID0
)
5315 do_div(length
, map
->num_stripes
);
5316 else if (map
->type
& (BTRFS_BLOCK_GROUP_RAID5
|
5317 BTRFS_BLOCK_GROUP_RAID6
)) {
5318 do_div(length
, nr_data_stripes(map
));
5319 rmap_len
= map
->stripe_len
* nr_data_stripes(map
);
5322 buf
= kzalloc(sizeof(u64
) * map
->num_stripes
, GFP_NOFS
);
5323 BUG_ON(!buf
); /* -ENOMEM */
5325 for (i
= 0; i
< map
->num_stripes
; i
++) {
5326 if (devid
&& map
->stripes
[i
].dev
->devid
!= devid
)
5328 if (map
->stripes
[i
].physical
> physical
||
5329 map
->stripes
[i
].physical
+ length
<= physical
)
5332 stripe_nr
= physical
- map
->stripes
[i
].physical
;
5333 do_div(stripe_nr
, map
->stripe_len
);
5335 if (map
->type
& BTRFS_BLOCK_GROUP_RAID10
) {
5336 stripe_nr
= stripe_nr
* map
->num_stripes
+ i
;
5337 do_div(stripe_nr
, map
->sub_stripes
);
5338 } else if (map
->type
& BTRFS_BLOCK_GROUP_RAID0
) {
5339 stripe_nr
= stripe_nr
* map
->num_stripes
+ i
;
5340 } /* else if RAID[56], multiply by nr_data_stripes().
5341 * Alternatively, just use rmap_len below instead of
5342 * map->stripe_len */
5344 bytenr
= chunk_start
+ stripe_nr
* rmap_len
;
5345 WARN_ON(nr
>= map
->num_stripes
);
5346 for (j
= 0; j
< nr
; j
++) {
5347 if (buf
[j
] == bytenr
)
5351 WARN_ON(nr
>= map
->num_stripes
);
5358 *stripe_len
= rmap_len
;
5360 free_extent_map(em
);
5364 static void btrfs_end_bio(struct bio
*bio
, int err
)
5366 struct btrfs_bio
*bbio
= bio
->bi_private
;
5367 struct btrfs_device
*dev
= bbio
->stripes
[0].dev
;
5368 int is_orig_bio
= 0;
5371 atomic_inc(&bbio
->error
);
5372 if (err
== -EIO
|| err
== -EREMOTEIO
) {
5373 unsigned int stripe_index
=
5374 btrfs_io_bio(bio
)->stripe_index
;
5376 BUG_ON(stripe_index
>= bbio
->num_stripes
);
5377 dev
= bbio
->stripes
[stripe_index
].dev
;
5379 if (bio
->bi_rw
& WRITE
)
5380 btrfs_dev_stat_inc(dev
,
5381 BTRFS_DEV_STAT_WRITE_ERRS
);
5383 btrfs_dev_stat_inc(dev
,
5384 BTRFS_DEV_STAT_READ_ERRS
);
5385 if ((bio
->bi_rw
& WRITE_FLUSH
) == WRITE_FLUSH
)
5386 btrfs_dev_stat_inc(dev
,
5387 BTRFS_DEV_STAT_FLUSH_ERRS
);
5388 btrfs_dev_stat_print_on_error(dev
);
5393 if (bio
== bbio
->orig_bio
)
5396 btrfs_bio_counter_dec(bbio
->fs_info
);
5398 if (atomic_dec_and_test(&bbio
->stripes_pending
)) {
5401 bio
= bbio
->orig_bio
;
5405 * We have original bio now. So increment bi_remaining to
5406 * account for it in endio
5408 atomic_inc(&bio
->bi_remaining
);
5410 bio
->bi_private
= bbio
->private;
5411 bio
->bi_end_io
= bbio
->end_io
;
5412 btrfs_io_bio(bio
)->mirror_num
= bbio
->mirror_num
;
5413 /* only send an error to the higher layers if it is
5414 * beyond the tolerance of the btrfs bio
5416 if (atomic_read(&bbio
->error
) > bbio
->max_errors
) {
5420 * this bio is actually up to date, we didn't
5421 * go over the max number of errors
5423 set_bit(BIO_UPTODATE
, &bio
->bi_flags
);
5428 bio_endio(bio
, err
);
5429 } else if (!is_orig_bio
) {
5435 * see run_scheduled_bios for a description of why bios are collected for
5438 * This will add one bio to the pending list for a device and make sure
5439 * the work struct is scheduled.
5441 static noinline
void btrfs_schedule_bio(struct btrfs_root
*root
,
5442 struct btrfs_device
*device
,
5443 int rw
, struct bio
*bio
)
5445 int should_queue
= 1;
5446 struct btrfs_pending_bios
*pending_bios
;
5448 if (device
->missing
|| !device
->bdev
) {
5449 bio_endio(bio
, -EIO
);
5453 /* don't bother with additional async steps for reads, right now */
5454 if (!(rw
& REQ_WRITE
)) {
5456 btrfsic_submit_bio(rw
, bio
);
5462 * nr_async_bios allows us to reliably return congestion to the
5463 * higher layers. Otherwise, the async bio makes it appear we have
5464 * made progress against dirty pages when we've really just put it
5465 * on a queue for later
5467 atomic_inc(&root
->fs_info
->nr_async_bios
);
5468 WARN_ON(bio
->bi_next
);
5469 bio
->bi_next
= NULL
;
5472 spin_lock(&device
->io_lock
);
5473 if (bio
->bi_rw
& REQ_SYNC
)
5474 pending_bios
= &device
->pending_sync_bios
;
5476 pending_bios
= &device
->pending_bios
;
5478 if (pending_bios
->tail
)
5479 pending_bios
->tail
->bi_next
= bio
;
5481 pending_bios
->tail
= bio
;
5482 if (!pending_bios
->head
)
5483 pending_bios
->head
= bio
;
5484 if (device
->running_pending
)
5487 spin_unlock(&device
->io_lock
);
5490 btrfs_queue_work(root
->fs_info
->submit_workers
,
5494 static int bio_size_ok(struct block_device
*bdev
, struct bio
*bio
,
5497 struct bio_vec
*prev
;
5498 struct request_queue
*q
= bdev_get_queue(bdev
);
5499 unsigned int max_sectors
= queue_max_sectors(q
);
5500 struct bvec_merge_data bvm
= {
5502 .bi_sector
= sector
,
5503 .bi_rw
= bio
->bi_rw
,
5506 if (WARN_ON(bio
->bi_vcnt
== 0))
5509 prev
= &bio
->bi_io_vec
[bio
->bi_vcnt
- 1];
5510 if (bio_sectors(bio
) > max_sectors
)
5513 if (!q
->merge_bvec_fn
)
5516 bvm
.bi_size
= bio
->bi_iter
.bi_size
- prev
->bv_len
;
5517 if (q
->merge_bvec_fn(q
, &bvm
, prev
) < prev
->bv_len
)
5522 static void submit_stripe_bio(struct btrfs_root
*root
, struct btrfs_bio
*bbio
,
5523 struct bio
*bio
, u64 physical
, int dev_nr
,
5526 struct btrfs_device
*dev
= bbio
->stripes
[dev_nr
].dev
;
5528 bio
->bi_private
= bbio
;
5529 btrfs_io_bio(bio
)->stripe_index
= dev_nr
;
5530 bio
->bi_end_io
= btrfs_end_bio
;
5531 bio
->bi_iter
.bi_sector
= physical
>> 9;
5534 struct rcu_string
*name
;
5537 name
= rcu_dereference(dev
->name
);
5538 pr_debug("btrfs_map_bio: rw %d, sector=%llu, dev=%lu "
5539 "(%s id %llu), size=%u\n", rw
,
5540 (u64
)bio
->bi_sector
, (u_long
)dev
->bdev
->bd_dev
,
5541 name
->str
, dev
->devid
, bio
->bi_size
);
5545 bio
->bi_bdev
= dev
->bdev
;
5547 btrfs_bio_counter_inc_noblocked(root
->fs_info
);
5550 btrfs_schedule_bio(root
, dev
, rw
, bio
);
5552 btrfsic_submit_bio(rw
, bio
);
5555 static int breakup_stripe_bio(struct btrfs_root
*root
, struct btrfs_bio
*bbio
,
5556 struct bio
*first_bio
, struct btrfs_device
*dev
,
5557 int dev_nr
, int rw
, int async
)
5559 struct bio_vec
*bvec
= first_bio
->bi_io_vec
;
5561 int nr_vecs
= bio_get_nr_vecs(dev
->bdev
);
5562 u64 physical
= bbio
->stripes
[dev_nr
].physical
;
5565 bio
= btrfs_bio_alloc(dev
->bdev
, physical
>> 9, nr_vecs
, GFP_NOFS
);
5569 while (bvec
<= (first_bio
->bi_io_vec
+ first_bio
->bi_vcnt
- 1)) {
5570 if (bio_add_page(bio
, bvec
->bv_page
, bvec
->bv_len
,
5571 bvec
->bv_offset
) < bvec
->bv_len
) {
5572 u64 len
= bio
->bi_iter
.bi_size
;
5574 atomic_inc(&bbio
->stripes_pending
);
5575 submit_stripe_bio(root
, bbio
, bio
, physical
, dev_nr
,
5583 submit_stripe_bio(root
, bbio
, bio
, physical
, dev_nr
, rw
, async
);
5587 static void bbio_error(struct btrfs_bio
*bbio
, struct bio
*bio
, u64 logical
)
5589 atomic_inc(&bbio
->error
);
5590 if (atomic_dec_and_test(&bbio
->stripes_pending
)) {
5591 bio
->bi_private
= bbio
->private;
5592 bio
->bi_end_io
= bbio
->end_io
;
5593 btrfs_io_bio(bio
)->mirror_num
= bbio
->mirror_num
;
5594 bio
->bi_iter
.bi_sector
= logical
>> 9;
5596 bio_endio(bio
, -EIO
);
5600 int btrfs_map_bio(struct btrfs_root
*root
, int rw
, struct bio
*bio
,
5601 int mirror_num
, int async_submit
)
5603 struct btrfs_device
*dev
;
5604 struct bio
*first_bio
= bio
;
5605 u64 logical
= (u64
)bio
->bi_iter
.bi_sector
<< 9;
5608 u64
*raid_map
= NULL
;
5612 struct btrfs_bio
*bbio
= NULL
;
5614 length
= bio
->bi_iter
.bi_size
;
5615 map_length
= length
;
5617 btrfs_bio_counter_inc_blocked(root
->fs_info
);
5618 ret
= __btrfs_map_block(root
->fs_info
, rw
, logical
, &map_length
, &bbio
,
5619 mirror_num
, &raid_map
);
5621 btrfs_bio_counter_dec(root
->fs_info
);
5625 total_devs
= bbio
->num_stripes
;
5626 bbio
->orig_bio
= first_bio
;
5627 bbio
->private = first_bio
->bi_private
;
5628 bbio
->end_io
= first_bio
->bi_end_io
;
5629 bbio
->fs_info
= root
->fs_info
;
5630 atomic_set(&bbio
->stripes_pending
, bbio
->num_stripes
);
5633 /* In this case, map_length has been set to the length of
5634 a single stripe; not the whole write */
5636 ret
= raid56_parity_write(root
, bio
, bbio
,
5637 raid_map
, map_length
);
5639 ret
= raid56_parity_recover(root
, bio
, bbio
,
5640 raid_map
, map_length
,
5644 * FIXME, replace dosen't support raid56 yet, please fix
5647 btrfs_bio_counter_dec(root
->fs_info
);
5651 if (map_length
< length
) {
5652 btrfs_crit(root
->fs_info
, "mapping failed logical %llu bio len %llu len %llu",
5653 logical
, length
, map_length
);
5657 while (dev_nr
< total_devs
) {
5658 dev
= bbio
->stripes
[dev_nr
].dev
;
5659 if (!dev
|| !dev
->bdev
|| (rw
& WRITE
&& !dev
->writeable
)) {
5660 bbio_error(bbio
, first_bio
, logical
);
5666 * Check and see if we're ok with this bio based on it's size
5667 * and offset with the given device.
5669 if (!bio_size_ok(dev
->bdev
, first_bio
,
5670 bbio
->stripes
[dev_nr
].physical
>> 9)) {
5671 ret
= breakup_stripe_bio(root
, bbio
, first_bio
, dev
,
5672 dev_nr
, rw
, async_submit
);
5678 if (dev_nr
< total_devs
- 1) {
5679 bio
= btrfs_bio_clone(first_bio
, GFP_NOFS
);
5680 BUG_ON(!bio
); /* -ENOMEM */
5685 submit_stripe_bio(root
, bbio
, bio
,
5686 bbio
->stripes
[dev_nr
].physical
, dev_nr
, rw
,
5690 btrfs_bio_counter_dec(root
->fs_info
);
5694 struct btrfs_device
*btrfs_find_device(struct btrfs_fs_info
*fs_info
, u64 devid
,
5697 struct btrfs_device
*device
;
5698 struct btrfs_fs_devices
*cur_devices
;
5700 cur_devices
= fs_info
->fs_devices
;
5701 while (cur_devices
) {
5703 !memcmp(cur_devices
->fsid
, fsid
, BTRFS_UUID_SIZE
)) {
5704 device
= __find_device(&cur_devices
->devices
,
5709 cur_devices
= cur_devices
->seed
;
5714 static struct btrfs_device
*add_missing_dev(struct btrfs_root
*root
,
5715 u64 devid
, u8
*dev_uuid
)
5717 struct btrfs_device
*device
;
5718 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
5720 device
= btrfs_alloc_device(NULL
, &devid
, dev_uuid
);
5724 list_add(&device
->dev_list
, &fs_devices
->devices
);
5725 device
->fs_devices
= fs_devices
;
5726 fs_devices
->num_devices
++;
5728 device
->missing
= 1;
5729 fs_devices
->missing_devices
++;
5735 * btrfs_alloc_device - allocate struct btrfs_device
5736 * @fs_info: used only for generating a new devid, can be NULL if
5737 * devid is provided (i.e. @devid != NULL).
5738 * @devid: a pointer to devid for this device. If NULL a new devid
5740 * @uuid: a pointer to UUID for this device. If NULL a new UUID
5743 * Return: a pointer to a new &struct btrfs_device on success; ERR_PTR()
5744 * on error. Returned struct is not linked onto any lists and can be
5745 * destroyed with kfree() right away.
5747 struct btrfs_device
*btrfs_alloc_device(struct btrfs_fs_info
*fs_info
,
5751 struct btrfs_device
*dev
;
5754 if (WARN_ON(!devid
&& !fs_info
))
5755 return ERR_PTR(-EINVAL
);
5757 dev
= __alloc_device();
5766 ret
= find_next_devid(fs_info
, &tmp
);
5769 return ERR_PTR(ret
);
5775 memcpy(dev
->uuid
, uuid
, BTRFS_UUID_SIZE
);
5777 generate_random_uuid(dev
->uuid
);
5779 btrfs_init_work(&dev
->work
, pending_bios_fn
, NULL
, NULL
);
5784 static int read_one_chunk(struct btrfs_root
*root
, struct btrfs_key
*key
,
5785 struct extent_buffer
*leaf
,
5786 struct btrfs_chunk
*chunk
)
5788 struct btrfs_mapping_tree
*map_tree
= &root
->fs_info
->mapping_tree
;
5789 struct map_lookup
*map
;
5790 struct extent_map
*em
;
5794 u8 uuid
[BTRFS_UUID_SIZE
];
5799 logical
= key
->offset
;
5800 length
= btrfs_chunk_length(leaf
, chunk
);
5802 read_lock(&map_tree
->map_tree
.lock
);
5803 em
= lookup_extent_mapping(&map_tree
->map_tree
, logical
, 1);
5804 read_unlock(&map_tree
->map_tree
.lock
);
5806 /* already mapped? */
5807 if (em
&& em
->start
<= logical
&& em
->start
+ em
->len
> logical
) {
5808 free_extent_map(em
);
5811 free_extent_map(em
);
5814 em
= alloc_extent_map();
5817 num_stripes
= btrfs_chunk_num_stripes(leaf
, chunk
);
5818 map
= kmalloc(map_lookup_size(num_stripes
), GFP_NOFS
);
5820 free_extent_map(em
);
5824 em
->bdev
= (struct block_device
*)map
;
5825 em
->start
= logical
;
5828 em
->block_start
= 0;
5829 em
->block_len
= em
->len
;
5831 map
->num_stripes
= num_stripes
;
5832 map
->io_width
= btrfs_chunk_io_width(leaf
, chunk
);
5833 map
->io_align
= btrfs_chunk_io_align(leaf
, chunk
);
5834 map
->sector_size
= btrfs_chunk_sector_size(leaf
, chunk
);
5835 map
->stripe_len
= btrfs_chunk_stripe_len(leaf
, chunk
);
5836 map
->type
= btrfs_chunk_type(leaf
, chunk
);
5837 map
->sub_stripes
= btrfs_chunk_sub_stripes(leaf
, chunk
);
5838 for (i
= 0; i
< num_stripes
; i
++) {
5839 map
->stripes
[i
].physical
=
5840 btrfs_stripe_offset_nr(leaf
, chunk
, i
);
5841 devid
= btrfs_stripe_devid_nr(leaf
, chunk
, i
);
5842 read_extent_buffer(leaf
, uuid
, (unsigned long)
5843 btrfs_stripe_dev_uuid_nr(chunk
, i
),
5845 map
->stripes
[i
].dev
= btrfs_find_device(root
->fs_info
, devid
,
5847 if (!map
->stripes
[i
].dev
&& !btrfs_test_opt(root
, DEGRADED
)) {
5849 free_extent_map(em
);
5852 if (!map
->stripes
[i
].dev
) {
5853 map
->stripes
[i
].dev
=
5854 add_missing_dev(root
, devid
, uuid
);
5855 if (!map
->stripes
[i
].dev
) {
5857 free_extent_map(em
);
5861 map
->stripes
[i
].dev
->in_fs_metadata
= 1;
5864 write_lock(&map_tree
->map_tree
.lock
);
5865 ret
= add_extent_mapping(&map_tree
->map_tree
, em
, 0);
5866 write_unlock(&map_tree
->map_tree
.lock
);
5867 BUG_ON(ret
); /* Tree corruption */
5868 free_extent_map(em
);
5873 static void fill_device_from_item(struct extent_buffer
*leaf
,
5874 struct btrfs_dev_item
*dev_item
,
5875 struct btrfs_device
*device
)
5879 device
->devid
= btrfs_device_id(leaf
, dev_item
);
5880 device
->disk_total_bytes
= btrfs_device_total_bytes(leaf
, dev_item
);
5881 device
->total_bytes
= device
->disk_total_bytes
;
5882 device
->bytes_used
= btrfs_device_bytes_used(leaf
, dev_item
);
5883 device
->type
= btrfs_device_type(leaf
, dev_item
);
5884 device
->io_align
= btrfs_device_io_align(leaf
, dev_item
);
5885 device
->io_width
= btrfs_device_io_width(leaf
, dev_item
);
5886 device
->sector_size
= btrfs_device_sector_size(leaf
, dev_item
);
5887 WARN_ON(device
->devid
== BTRFS_DEV_REPLACE_DEVID
);
5888 device
->is_tgtdev_for_dev_replace
= 0;
5890 ptr
= btrfs_device_uuid(dev_item
);
5891 read_extent_buffer(leaf
, device
->uuid
, ptr
, BTRFS_UUID_SIZE
);
5894 static int open_seed_devices(struct btrfs_root
*root
, u8
*fsid
)
5896 struct btrfs_fs_devices
*fs_devices
;
5899 BUG_ON(!mutex_is_locked(&uuid_mutex
));
5901 fs_devices
= root
->fs_info
->fs_devices
->seed
;
5902 while (fs_devices
) {
5903 if (!memcmp(fs_devices
->fsid
, fsid
, BTRFS_UUID_SIZE
)) {
5907 fs_devices
= fs_devices
->seed
;
5910 fs_devices
= find_fsid(fsid
);
5916 fs_devices
= clone_fs_devices(fs_devices
);
5917 if (IS_ERR(fs_devices
)) {
5918 ret
= PTR_ERR(fs_devices
);
5922 ret
= __btrfs_open_devices(fs_devices
, FMODE_READ
,
5923 root
->fs_info
->bdev_holder
);
5925 free_fs_devices(fs_devices
);
5929 if (!fs_devices
->seeding
) {
5930 __btrfs_close_devices(fs_devices
);
5931 free_fs_devices(fs_devices
);
5936 fs_devices
->seed
= root
->fs_info
->fs_devices
->seed
;
5937 root
->fs_info
->fs_devices
->seed
= fs_devices
;
5942 static int read_one_dev(struct btrfs_root
*root
,
5943 struct extent_buffer
*leaf
,
5944 struct btrfs_dev_item
*dev_item
)
5946 struct btrfs_device
*device
;
5949 u8 fs_uuid
[BTRFS_UUID_SIZE
];
5950 u8 dev_uuid
[BTRFS_UUID_SIZE
];
5952 devid
= btrfs_device_id(leaf
, dev_item
);
5953 read_extent_buffer(leaf
, dev_uuid
, btrfs_device_uuid(dev_item
),
5955 read_extent_buffer(leaf
, fs_uuid
, btrfs_device_fsid(dev_item
),
5958 if (memcmp(fs_uuid
, root
->fs_info
->fsid
, BTRFS_UUID_SIZE
)) {
5959 ret
= open_seed_devices(root
, fs_uuid
);
5960 if (ret
&& !btrfs_test_opt(root
, DEGRADED
))
5964 device
= btrfs_find_device(root
->fs_info
, devid
, dev_uuid
, fs_uuid
);
5965 if (!device
|| !device
->bdev
) {
5966 if (!btrfs_test_opt(root
, DEGRADED
))
5970 btrfs_warn(root
->fs_info
, "devid %llu missing", devid
);
5971 device
= add_missing_dev(root
, devid
, dev_uuid
);
5974 } else if (!device
->missing
) {
5976 * this happens when a device that was properly setup
5977 * in the device info lists suddenly goes bad.
5978 * device->bdev is NULL, and so we have to set
5979 * device->missing to one here
5981 root
->fs_info
->fs_devices
->missing_devices
++;
5982 device
->missing
= 1;
5986 if (device
->fs_devices
!= root
->fs_info
->fs_devices
) {
5987 BUG_ON(device
->writeable
);
5988 if (device
->generation
!=
5989 btrfs_device_generation(leaf
, dev_item
))
5993 fill_device_from_item(leaf
, dev_item
, device
);
5994 device
->in_fs_metadata
= 1;
5995 if (device
->writeable
&& !device
->is_tgtdev_for_dev_replace
) {
5996 device
->fs_devices
->total_rw_bytes
+= device
->total_bytes
;
5997 spin_lock(&root
->fs_info
->free_chunk_lock
);
5998 root
->fs_info
->free_chunk_space
+= device
->total_bytes
-
6000 spin_unlock(&root
->fs_info
->free_chunk_lock
);
6006 int btrfs_read_sys_array(struct btrfs_root
*root
)
6008 struct btrfs_super_block
*super_copy
= root
->fs_info
->super_copy
;
6009 struct extent_buffer
*sb
;
6010 struct btrfs_disk_key
*disk_key
;
6011 struct btrfs_chunk
*chunk
;
6013 unsigned long sb_ptr
;
6019 struct btrfs_key key
;
6021 sb
= btrfs_find_create_tree_block(root
, BTRFS_SUPER_INFO_OFFSET
,
6022 BTRFS_SUPER_INFO_SIZE
);
6025 btrfs_set_buffer_uptodate(sb
);
6026 btrfs_set_buffer_lockdep_class(root
->root_key
.objectid
, sb
, 0);
6028 * The sb extent buffer is artifical and just used to read the system array.
6029 * btrfs_set_buffer_uptodate() call does not properly mark all it's
6030 * pages up-to-date when the page is larger: extent does not cover the
6031 * whole page and consequently check_page_uptodate does not find all
6032 * the page's extents up-to-date (the hole beyond sb),
6033 * write_extent_buffer then triggers a WARN_ON.
6035 * Regular short extents go through mark_extent_buffer_dirty/writeback cycle,
6036 * but sb spans only this function. Add an explicit SetPageUptodate call
6037 * to silence the warning eg. on PowerPC 64.
6039 if (PAGE_CACHE_SIZE
> BTRFS_SUPER_INFO_SIZE
)
6040 SetPageUptodate(sb
->pages
[0]);
6042 write_extent_buffer(sb
, super_copy
, 0, BTRFS_SUPER_INFO_SIZE
);
6043 array_size
= btrfs_super_sys_array_size(super_copy
);
6045 ptr
= super_copy
->sys_chunk_array
;
6046 sb_ptr
= offsetof(struct btrfs_super_block
, sys_chunk_array
);
6049 while (cur
< array_size
) {
6050 disk_key
= (struct btrfs_disk_key
*)ptr
;
6051 btrfs_disk_key_to_cpu(&key
, disk_key
);
6053 len
= sizeof(*disk_key
); ptr
+= len
;
6057 if (key
.type
== BTRFS_CHUNK_ITEM_KEY
) {
6058 chunk
= (struct btrfs_chunk
*)sb_ptr
;
6059 ret
= read_one_chunk(root
, &key
, sb
, chunk
);
6062 num_stripes
= btrfs_chunk_num_stripes(sb
, chunk
);
6063 len
= btrfs_chunk_item_size(num_stripes
);
6072 free_extent_buffer(sb
);
6076 int btrfs_read_chunk_tree(struct btrfs_root
*root
)
6078 struct btrfs_path
*path
;
6079 struct extent_buffer
*leaf
;
6080 struct btrfs_key key
;
6081 struct btrfs_key found_key
;
6085 root
= root
->fs_info
->chunk_root
;
6087 path
= btrfs_alloc_path();
6091 mutex_lock(&uuid_mutex
);
6095 * Read all device items, and then all the chunk items. All
6096 * device items are found before any chunk item (their object id
6097 * is smaller than the lowest possible object id for a chunk
6098 * item - BTRFS_FIRST_CHUNK_TREE_OBJECTID).
6100 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
6103 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
6107 leaf
= path
->nodes
[0];
6108 slot
= path
->slots
[0];
6109 if (slot
>= btrfs_header_nritems(leaf
)) {
6110 ret
= btrfs_next_leaf(root
, path
);
6117 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
6118 if (found_key
.type
== BTRFS_DEV_ITEM_KEY
) {
6119 struct btrfs_dev_item
*dev_item
;
6120 dev_item
= btrfs_item_ptr(leaf
, slot
,
6121 struct btrfs_dev_item
);
6122 ret
= read_one_dev(root
, leaf
, dev_item
);
6125 } else if (found_key
.type
== BTRFS_CHUNK_ITEM_KEY
) {
6126 struct btrfs_chunk
*chunk
;
6127 chunk
= btrfs_item_ptr(leaf
, slot
, struct btrfs_chunk
);
6128 ret
= read_one_chunk(root
, &found_key
, leaf
, chunk
);
6136 unlock_chunks(root
);
6137 mutex_unlock(&uuid_mutex
);
6139 btrfs_free_path(path
);
6143 void btrfs_init_devices_late(struct btrfs_fs_info
*fs_info
)
6145 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
6146 struct btrfs_device
*device
;
6148 while (fs_devices
) {
6149 mutex_lock(&fs_devices
->device_list_mutex
);
6150 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
)
6151 device
->dev_root
= fs_info
->dev_root
;
6152 mutex_unlock(&fs_devices
->device_list_mutex
);
6154 fs_devices
= fs_devices
->seed
;
6158 static void __btrfs_reset_dev_stats(struct btrfs_device
*dev
)
6162 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++)
6163 btrfs_dev_stat_reset(dev
, i
);
6166 int btrfs_init_dev_stats(struct btrfs_fs_info
*fs_info
)
6168 struct btrfs_key key
;
6169 struct btrfs_key found_key
;
6170 struct btrfs_root
*dev_root
= fs_info
->dev_root
;
6171 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
6172 struct extent_buffer
*eb
;
6175 struct btrfs_device
*device
;
6176 struct btrfs_path
*path
= NULL
;
6179 path
= btrfs_alloc_path();
6185 mutex_lock(&fs_devices
->device_list_mutex
);
6186 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
) {
6188 struct btrfs_dev_stats_item
*ptr
;
6191 key
.type
= BTRFS_DEV_STATS_KEY
;
6192 key
.offset
= device
->devid
;
6193 ret
= btrfs_search_slot(NULL
, dev_root
, &key
, path
, 0, 0);
6195 __btrfs_reset_dev_stats(device
);
6196 device
->dev_stats_valid
= 1;
6197 btrfs_release_path(path
);
6200 slot
= path
->slots
[0];
6201 eb
= path
->nodes
[0];
6202 btrfs_item_key_to_cpu(eb
, &found_key
, slot
);
6203 item_size
= btrfs_item_size_nr(eb
, slot
);
6205 ptr
= btrfs_item_ptr(eb
, slot
,
6206 struct btrfs_dev_stats_item
);
6208 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++) {
6209 if (item_size
>= (1 + i
) * sizeof(__le64
))
6210 btrfs_dev_stat_set(device
, i
,
6211 btrfs_dev_stats_value(eb
, ptr
, i
));
6213 btrfs_dev_stat_reset(device
, i
);
6216 device
->dev_stats_valid
= 1;
6217 btrfs_dev_stat_print_on_load(device
);
6218 btrfs_release_path(path
);
6220 mutex_unlock(&fs_devices
->device_list_mutex
);
6223 btrfs_free_path(path
);
6224 return ret
< 0 ? ret
: 0;
6227 static int update_dev_stat_item(struct btrfs_trans_handle
*trans
,
6228 struct btrfs_root
*dev_root
,
6229 struct btrfs_device
*device
)
6231 struct btrfs_path
*path
;
6232 struct btrfs_key key
;
6233 struct extent_buffer
*eb
;
6234 struct btrfs_dev_stats_item
*ptr
;
6239 key
.type
= BTRFS_DEV_STATS_KEY
;
6240 key
.offset
= device
->devid
;
6242 path
= btrfs_alloc_path();
6244 ret
= btrfs_search_slot(trans
, dev_root
, &key
, path
, -1, 1);
6246 printk_in_rcu(KERN_WARNING
"BTRFS: "
6247 "error %d while searching for dev_stats item for device %s!\n",
6248 ret
, rcu_str_deref(device
->name
));
6253 btrfs_item_size_nr(path
->nodes
[0], path
->slots
[0]) < sizeof(*ptr
)) {
6254 /* need to delete old one and insert a new one */
6255 ret
= btrfs_del_item(trans
, dev_root
, path
);
6257 printk_in_rcu(KERN_WARNING
"BTRFS: "
6258 "delete too small dev_stats item for device %s failed %d!\n",
6259 rcu_str_deref(device
->name
), ret
);
6266 /* need to insert a new item */
6267 btrfs_release_path(path
);
6268 ret
= btrfs_insert_empty_item(trans
, dev_root
, path
,
6269 &key
, sizeof(*ptr
));
6271 printk_in_rcu(KERN_WARNING
"BTRFS: "
6272 "insert dev_stats item for device %s failed %d!\n",
6273 rcu_str_deref(device
->name
), ret
);
6278 eb
= path
->nodes
[0];
6279 ptr
= btrfs_item_ptr(eb
, path
->slots
[0], struct btrfs_dev_stats_item
);
6280 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++)
6281 btrfs_set_dev_stats_value(eb
, ptr
, i
,
6282 btrfs_dev_stat_read(device
, i
));
6283 btrfs_mark_buffer_dirty(eb
);
6286 btrfs_free_path(path
);
6291 * called from commit_transaction. Writes all changed device stats to disk.
6293 int btrfs_run_dev_stats(struct btrfs_trans_handle
*trans
,
6294 struct btrfs_fs_info
*fs_info
)
6296 struct btrfs_root
*dev_root
= fs_info
->dev_root
;
6297 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
6298 struct btrfs_device
*device
;
6301 mutex_lock(&fs_devices
->device_list_mutex
);
6302 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
) {
6303 if (!device
->dev_stats_valid
|| !device
->dev_stats_dirty
)
6306 ret
= update_dev_stat_item(trans
, dev_root
, device
);
6308 device
->dev_stats_dirty
= 0;
6310 mutex_unlock(&fs_devices
->device_list_mutex
);
6315 void btrfs_dev_stat_inc_and_print(struct btrfs_device
*dev
, int index
)
6317 btrfs_dev_stat_inc(dev
, index
);
6318 btrfs_dev_stat_print_on_error(dev
);
6321 static void btrfs_dev_stat_print_on_error(struct btrfs_device
*dev
)
6323 if (!dev
->dev_stats_valid
)
6325 printk_ratelimited_in_rcu(KERN_ERR
"BTRFS: "
6326 "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n",
6327 rcu_str_deref(dev
->name
),
6328 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_WRITE_ERRS
),
6329 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_READ_ERRS
),
6330 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_FLUSH_ERRS
),
6331 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_CORRUPTION_ERRS
),
6332 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_GENERATION_ERRS
));
6335 static void btrfs_dev_stat_print_on_load(struct btrfs_device
*dev
)
6339 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++)
6340 if (btrfs_dev_stat_read(dev
, i
) != 0)
6342 if (i
== BTRFS_DEV_STAT_VALUES_MAX
)
6343 return; /* all values == 0, suppress message */
6345 printk_in_rcu(KERN_INFO
"BTRFS: "
6346 "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n",
6347 rcu_str_deref(dev
->name
),
6348 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_WRITE_ERRS
),
6349 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_READ_ERRS
),
6350 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_FLUSH_ERRS
),
6351 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_CORRUPTION_ERRS
),
6352 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_GENERATION_ERRS
));
6355 int btrfs_get_dev_stats(struct btrfs_root
*root
,
6356 struct btrfs_ioctl_get_dev_stats
*stats
)
6358 struct btrfs_device
*dev
;
6359 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
6362 mutex_lock(&fs_devices
->device_list_mutex
);
6363 dev
= btrfs_find_device(root
->fs_info
, stats
->devid
, NULL
, NULL
);
6364 mutex_unlock(&fs_devices
->device_list_mutex
);
6367 btrfs_warn(root
->fs_info
, "get dev_stats failed, device not found");
6369 } else if (!dev
->dev_stats_valid
) {
6370 btrfs_warn(root
->fs_info
, "get dev_stats failed, not yet valid");
6372 } else if (stats
->flags
& BTRFS_DEV_STATS_RESET
) {
6373 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++) {
6374 if (stats
->nr_items
> i
)
6376 btrfs_dev_stat_read_and_reset(dev
, i
);
6378 btrfs_dev_stat_reset(dev
, i
);
6381 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++)
6382 if (stats
->nr_items
> i
)
6383 stats
->values
[i
] = btrfs_dev_stat_read(dev
, i
);
6385 if (stats
->nr_items
> BTRFS_DEV_STAT_VALUES_MAX
)
6386 stats
->nr_items
= BTRFS_DEV_STAT_VALUES_MAX
;
6390 int btrfs_scratch_superblock(struct btrfs_device
*device
)
6392 struct buffer_head
*bh
;
6393 struct btrfs_super_block
*disk_super
;
6395 bh
= btrfs_read_dev_super(device
->bdev
);
6398 disk_super
= (struct btrfs_super_block
*)bh
->b_data
;
6400 memset(&disk_super
->magic
, 0, sizeof(disk_super
->magic
));
6401 set_buffer_dirty(bh
);
6402 sync_dirty_buffer(bh
);