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>
33 #include "extent_map.h"
35 #include "transaction.h"
36 #include "print-tree.h"
39 #include "async-thread.h"
40 #include "check-integrity.h"
41 #include "rcu-string.h"
43 #include "dev-replace.h"
45 static int init_first_rw_device(struct btrfs_trans_handle *trans,
46 struct btrfs_root *root,
47 struct btrfs_device *device);
48 static int btrfs_relocate_sys_chunks(struct btrfs_root *root);
49 static void __btrfs_reset_dev_stats(struct btrfs_device *dev);
50 static void btrfs_dev_stat_print_on_error(struct btrfs_device *dev);
51 static void btrfs_dev_stat_print_on_load(struct btrfs_device *device);
53 static DEFINE_MUTEX(uuid_mutex);
54 static LIST_HEAD(fs_uuids);
56 static void lock_chunks(struct btrfs_root *root)
58 mutex_lock(&root->fs_info->chunk_mutex);
61 static void unlock_chunks(struct btrfs_root *root)
63 mutex_unlock(&root->fs_info->chunk_mutex);
66 static struct btrfs_fs_devices *__alloc_fs_devices(void)
68 struct btrfs_fs_devices *fs_devs;
70 fs_devs = kzalloc(sizeof(*fs_devs), GFP_NOFS);
72 return ERR_PTR(-ENOMEM);
74 mutex_init(&fs_devs->device_list_mutex);
76 INIT_LIST_HEAD(&fs_devs->devices);
77 INIT_LIST_HEAD(&fs_devs->alloc_list);
78 INIT_LIST_HEAD(&fs_devs->list);
84 * alloc_fs_devices - allocate struct btrfs_fs_devices
85 * @fsid: a pointer to UUID for this FS. If NULL a new UUID is
88 * Return: a pointer to a new &struct btrfs_fs_devices on success;
89 * ERR_PTR() on error. Returned struct is not linked onto any lists and
90 * can be destroyed with kfree() right away.
92 static struct btrfs_fs_devices *alloc_fs_devices(const u8 *fsid)
94 struct btrfs_fs_devices *fs_devs;
96 fs_devs = __alloc_fs_devices();
101 memcpy(fs_devs->fsid, fsid, BTRFS_FSID_SIZE);
103 generate_random_uuid(fs_devs->fsid);
108 static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
110 struct btrfs_device *device;
111 WARN_ON(fs_devices->opened);
112 while (!list_empty(&fs_devices->devices)) {
113 device = list_entry(fs_devices->devices.next,
114 struct btrfs_device, dev_list);
115 list_del(&device->dev_list);
116 rcu_string_free(device->name);
122 static void btrfs_kobject_uevent(struct block_device *bdev,
123 enum kobject_action action)
127 ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action);
129 pr_warn("Sending event '%d' to kobject: '%s' (%p): failed\n",
131 kobject_name(&disk_to_dev(bdev->bd_disk)->kobj),
132 &disk_to_dev(bdev->bd_disk)->kobj);
135 void btrfs_cleanup_fs_uuids(void)
137 struct btrfs_fs_devices *fs_devices;
139 while (!list_empty(&fs_uuids)) {
140 fs_devices = list_entry(fs_uuids.next,
141 struct btrfs_fs_devices, list);
142 list_del(&fs_devices->list);
143 free_fs_devices(fs_devices);
147 static struct btrfs_device *__alloc_device(void)
149 struct btrfs_device *dev;
151 dev = kzalloc(sizeof(*dev), GFP_NOFS);
153 return ERR_PTR(-ENOMEM);
155 INIT_LIST_HEAD(&dev->dev_list);
156 INIT_LIST_HEAD(&dev->dev_alloc_list);
158 spin_lock_init(&dev->io_lock);
160 spin_lock_init(&dev->reada_lock);
161 atomic_set(&dev->reada_in_flight, 0);
162 INIT_RADIX_TREE(&dev->reada_zones, GFP_NOFS & ~__GFP_WAIT);
163 INIT_RADIX_TREE(&dev->reada_extents, GFP_NOFS & ~__GFP_WAIT);
168 static noinline struct btrfs_device *__find_device(struct list_head *head,
171 struct btrfs_device *dev;
173 list_for_each_entry(dev, head, dev_list) {
174 if (dev->devid == devid &&
175 (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) {
182 static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid)
184 struct btrfs_fs_devices *fs_devices;
186 list_for_each_entry(fs_devices, &fs_uuids, list) {
187 if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0)
194 btrfs_get_bdev_and_sb(const char *device_path, fmode_t flags, void *holder,
195 int flush, struct block_device **bdev,
196 struct buffer_head **bh)
200 *bdev = blkdev_get_by_path(device_path, flags, holder);
203 ret = PTR_ERR(*bdev);
204 printk(KERN_INFO "btrfs: open %s failed\n", device_path);
209 filemap_write_and_wait((*bdev)->bd_inode->i_mapping);
210 ret = set_blocksize(*bdev, 4096);
212 blkdev_put(*bdev, flags);
215 invalidate_bdev(*bdev);
216 *bh = btrfs_read_dev_super(*bdev);
219 blkdev_put(*bdev, flags);
231 static void requeue_list(struct btrfs_pending_bios *pending_bios,
232 struct bio *head, struct bio *tail)
235 struct bio *old_head;
237 old_head = pending_bios->head;
238 pending_bios->head = head;
239 if (pending_bios->tail)
240 tail->bi_next = old_head;
242 pending_bios->tail = tail;
246 * we try to collect pending bios for a device so we don't get a large
247 * number of procs sending bios down to the same device. This greatly
248 * improves the schedulers ability to collect and merge the bios.
250 * But, it also turns into a long list of bios to process and that is sure
251 * to eventually make the worker thread block. The solution here is to
252 * make some progress and then put this work struct back at the end of
253 * the list if the block device is congested. This way, multiple devices
254 * can make progress from a single worker thread.
256 static noinline void run_scheduled_bios(struct btrfs_device *device)
259 struct backing_dev_info *bdi;
260 struct btrfs_fs_info *fs_info;
261 struct btrfs_pending_bios *pending_bios;
265 unsigned long num_run;
266 unsigned long batch_run = 0;
268 unsigned long last_waited = 0;
270 int sync_pending = 0;
271 struct blk_plug plug;
274 * this function runs all the bios we've collected for
275 * a particular device. We don't want to wander off to
276 * another device without first sending all of these down.
277 * So, setup a plug here and finish it off before we return
279 blk_start_plug(&plug);
281 bdi = blk_get_backing_dev_info(device->bdev);
282 fs_info = device->dev_root->fs_info;
283 limit = btrfs_async_submit_limit(fs_info);
284 limit = limit * 2 / 3;
287 spin_lock(&device->io_lock);
292 /* take all the bios off the list at once and process them
293 * later on (without the lock held). But, remember the
294 * tail and other pointers so the bios can be properly reinserted
295 * into the list if we hit congestion
297 if (!force_reg && device->pending_sync_bios.head) {
298 pending_bios = &device->pending_sync_bios;
301 pending_bios = &device->pending_bios;
305 pending = pending_bios->head;
306 tail = pending_bios->tail;
307 WARN_ON(pending && !tail);
310 * if pending was null this time around, no bios need processing
311 * at all and we can stop. Otherwise it'll loop back up again
312 * and do an additional check so no bios are missed.
314 * device->running_pending is used to synchronize with the
317 if (device->pending_sync_bios.head == NULL &&
318 device->pending_bios.head == NULL) {
320 device->running_pending = 0;
323 device->running_pending = 1;
326 pending_bios->head = NULL;
327 pending_bios->tail = NULL;
329 spin_unlock(&device->io_lock);
334 /* we want to work on both lists, but do more bios on the
335 * sync list than the regular list
338 pending_bios != &device->pending_sync_bios &&
339 device->pending_sync_bios.head) ||
340 (num_run > 64 && pending_bios == &device->pending_sync_bios &&
341 device->pending_bios.head)) {
342 spin_lock(&device->io_lock);
343 requeue_list(pending_bios, pending, tail);
348 pending = pending->bi_next;
351 if (atomic_dec_return(&fs_info->nr_async_bios) < limit &&
352 waitqueue_active(&fs_info->async_submit_wait))
353 wake_up(&fs_info->async_submit_wait);
355 BUG_ON(atomic_read(&cur->bi_cnt) == 0);
358 * if we're doing the sync list, record that our
359 * plug has some sync requests on it
361 * If we're doing the regular list and there are
362 * sync requests sitting around, unplug before
365 if (pending_bios == &device->pending_sync_bios) {
367 } else if (sync_pending) {
368 blk_finish_plug(&plug);
369 blk_start_plug(&plug);
373 btrfsic_submit_bio(cur->bi_rw, cur);
380 * we made progress, there is more work to do and the bdi
381 * is now congested. Back off and let other work structs
384 if (pending && bdi_write_congested(bdi) && batch_run > 8 &&
385 fs_info->fs_devices->open_devices > 1) {
386 struct io_context *ioc;
388 ioc = current->io_context;
391 * the main goal here is that we don't want to
392 * block if we're going to be able to submit
393 * more requests without blocking.
395 * This code does two great things, it pokes into
396 * the elevator code from a filesystem _and_
397 * it makes assumptions about how batching works.
399 if (ioc && ioc->nr_batch_requests > 0 &&
400 time_before(jiffies, ioc->last_waited + HZ/50UL) &&
402 ioc->last_waited == last_waited)) {
404 * we want to go through our batch of
405 * requests and stop. So, we copy out
406 * the ioc->last_waited time and test
407 * against it before looping
409 last_waited = ioc->last_waited;
414 spin_lock(&device->io_lock);
415 requeue_list(pending_bios, pending, tail);
416 device->running_pending = 1;
418 spin_unlock(&device->io_lock);
419 btrfs_requeue_work(&device->work);
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);
451 static noinline int device_list_add(const char *path,
452 struct btrfs_super_block *disk_super,
453 u64 devid, struct btrfs_fs_devices **fs_devices_ret)
455 struct btrfs_device *device;
456 struct btrfs_fs_devices *fs_devices;
457 struct rcu_string *name;
458 u64 found_transid = btrfs_super_generation(disk_super);
460 fs_devices = find_fsid(disk_super->fsid);
462 fs_devices = alloc_fs_devices(disk_super->fsid);
463 if (IS_ERR(fs_devices))
464 return PTR_ERR(fs_devices);
466 list_add(&fs_devices->list, &fs_uuids);
467 fs_devices->latest_devid = devid;
468 fs_devices->latest_trans = found_transid;
472 device = __find_device(&fs_devices->devices, devid,
473 disk_super->dev_item.uuid);
476 if (fs_devices->opened)
479 device = btrfs_alloc_device(NULL, &devid,
480 disk_super->dev_item.uuid);
481 if (IS_ERR(device)) {
482 /* we can safely leave the fs_devices entry around */
483 return PTR_ERR(device);
486 name = rcu_string_strdup(path, GFP_NOFS);
491 rcu_assign_pointer(device->name, name);
493 mutex_lock(&fs_devices->device_list_mutex);
494 list_add_rcu(&device->dev_list, &fs_devices->devices);
495 fs_devices->num_devices++;
496 mutex_unlock(&fs_devices->device_list_mutex);
498 device->fs_devices = fs_devices;
499 } else if (!device->name || strcmp(device->name->str, path)) {
500 name = rcu_string_strdup(path, GFP_NOFS);
503 rcu_string_free(device->name);
504 rcu_assign_pointer(device->name, name);
505 if (device->missing) {
506 fs_devices->missing_devices--;
511 if (found_transid > fs_devices->latest_trans) {
512 fs_devices->latest_devid = devid;
513 fs_devices->latest_trans = found_transid;
515 *fs_devices_ret = fs_devices;
519 static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig)
521 struct btrfs_fs_devices *fs_devices;
522 struct btrfs_device *device;
523 struct btrfs_device *orig_dev;
525 fs_devices = alloc_fs_devices(orig->fsid);
526 if (IS_ERR(fs_devices))
529 fs_devices->latest_devid = orig->latest_devid;
530 fs_devices->latest_trans = orig->latest_trans;
531 fs_devices->total_devices = orig->total_devices;
533 /* We have held the volume lock, it is safe to get the devices. */
534 list_for_each_entry(orig_dev, &orig->devices, dev_list) {
535 struct rcu_string *name;
537 device = btrfs_alloc_device(NULL, &orig_dev->devid,
543 * This is ok to do without rcu read locked because we hold the
544 * uuid mutex so nothing we touch in here is going to disappear.
546 name = rcu_string_strdup(orig_dev->name->str, GFP_NOFS);
551 rcu_assign_pointer(device->name, name);
553 list_add(&device->dev_list, &fs_devices->devices);
554 device->fs_devices = fs_devices;
555 fs_devices->num_devices++;
559 free_fs_devices(fs_devices);
560 return ERR_PTR(-ENOMEM);
563 void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
564 struct btrfs_fs_devices *fs_devices, int step)
566 struct btrfs_device *device, *next;
568 struct block_device *latest_bdev = NULL;
569 u64 latest_devid = 0;
570 u64 latest_transid = 0;
572 mutex_lock(&uuid_mutex);
574 /* This is the initialized path, it is safe to release the devices. */
575 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
576 if (device->in_fs_metadata) {
577 if (!device->is_tgtdev_for_dev_replace &&
579 device->generation > latest_transid)) {
580 latest_devid = device->devid;
581 latest_transid = device->generation;
582 latest_bdev = device->bdev;
587 if (device->devid == BTRFS_DEV_REPLACE_DEVID) {
589 * In the first step, keep the device which has
590 * the correct fsid and the devid that is used
591 * for the dev_replace procedure.
592 * In the second step, the dev_replace state is
593 * read from the device tree and it is known
594 * whether the procedure is really active or
595 * not, which means whether this device is
596 * used or whether it should be removed.
598 if (step == 0 || device->is_tgtdev_for_dev_replace) {
603 blkdev_put(device->bdev, device->mode);
605 fs_devices->open_devices--;
607 if (device->writeable) {
608 list_del_init(&device->dev_alloc_list);
609 device->writeable = 0;
610 if (!device->is_tgtdev_for_dev_replace)
611 fs_devices->rw_devices--;
613 list_del_init(&device->dev_list);
614 fs_devices->num_devices--;
615 rcu_string_free(device->name);
619 if (fs_devices->seed) {
620 fs_devices = fs_devices->seed;
624 fs_devices->latest_bdev = latest_bdev;
625 fs_devices->latest_devid = latest_devid;
626 fs_devices->latest_trans = latest_transid;
628 mutex_unlock(&uuid_mutex);
631 static void __free_device(struct work_struct *work)
633 struct btrfs_device *device;
635 device = container_of(work, struct btrfs_device, rcu_work);
638 blkdev_put(device->bdev, device->mode);
640 rcu_string_free(device->name);
644 static void free_device(struct rcu_head *head)
646 struct btrfs_device *device;
648 device = container_of(head, struct btrfs_device, rcu);
650 INIT_WORK(&device->rcu_work, __free_device);
651 schedule_work(&device->rcu_work);
654 static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
656 struct btrfs_device *device;
658 if (--fs_devices->opened > 0)
661 mutex_lock(&fs_devices->device_list_mutex);
662 list_for_each_entry(device, &fs_devices->devices, dev_list) {
663 struct btrfs_device *new_device;
664 struct rcu_string *name;
667 fs_devices->open_devices--;
669 if (device->writeable && !device->is_tgtdev_for_dev_replace) {
670 list_del_init(&device->dev_alloc_list);
671 fs_devices->rw_devices--;
674 if (device->can_discard)
675 fs_devices->num_can_discard--;
677 fs_devices->missing_devices--;
679 new_device = btrfs_alloc_device(NULL, &device->devid,
681 BUG_ON(IS_ERR(new_device)); /* -ENOMEM */
683 /* Safe because we are under uuid_mutex */
685 name = rcu_string_strdup(device->name->str, GFP_NOFS);
686 BUG_ON(!name); /* -ENOMEM */
687 rcu_assign_pointer(new_device->name, name);
690 list_replace_rcu(&device->dev_list, &new_device->dev_list);
691 new_device->fs_devices = device->fs_devices;
693 call_rcu(&device->rcu, free_device);
695 mutex_unlock(&fs_devices->device_list_mutex);
697 WARN_ON(fs_devices->open_devices);
698 WARN_ON(fs_devices->rw_devices);
699 fs_devices->opened = 0;
700 fs_devices->seeding = 0;
705 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
707 struct btrfs_fs_devices *seed_devices = NULL;
710 mutex_lock(&uuid_mutex);
711 ret = __btrfs_close_devices(fs_devices);
712 if (!fs_devices->opened) {
713 seed_devices = fs_devices->seed;
714 fs_devices->seed = NULL;
716 mutex_unlock(&uuid_mutex);
718 while (seed_devices) {
719 fs_devices = seed_devices;
720 seed_devices = fs_devices->seed;
721 __btrfs_close_devices(fs_devices);
722 free_fs_devices(fs_devices);
725 * Wait for rcu kworkers under __btrfs_close_devices
726 * to finish all blkdev_puts so device is really
727 * free when umount is done.
733 static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
734 fmode_t flags, void *holder)
736 struct request_queue *q;
737 struct block_device *bdev;
738 struct list_head *head = &fs_devices->devices;
739 struct btrfs_device *device;
740 struct block_device *latest_bdev = NULL;
741 struct buffer_head *bh;
742 struct btrfs_super_block *disk_super;
743 u64 latest_devid = 0;
744 u64 latest_transid = 0;
751 list_for_each_entry(device, head, dev_list) {
757 /* Just open everything we can; ignore failures here */
758 if (btrfs_get_bdev_and_sb(device->name->str, flags, holder, 1,
762 disk_super = (struct btrfs_super_block *)bh->b_data;
763 devid = btrfs_stack_device_id(&disk_super->dev_item);
764 if (devid != device->devid)
767 if (memcmp(device->uuid, disk_super->dev_item.uuid,
771 device->generation = btrfs_super_generation(disk_super);
772 if (!latest_transid || device->generation > latest_transid) {
773 latest_devid = devid;
774 latest_transid = device->generation;
778 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) {
779 device->writeable = 0;
781 device->writeable = !bdev_read_only(bdev);
785 q = bdev_get_queue(bdev);
786 if (blk_queue_discard(q)) {
787 device->can_discard = 1;
788 fs_devices->num_can_discard++;
792 device->in_fs_metadata = 0;
793 device->mode = flags;
795 if (!blk_queue_nonrot(bdev_get_queue(bdev)))
796 fs_devices->rotating = 1;
798 fs_devices->open_devices++;
799 if (device->writeable &&
800 device->devid != BTRFS_DEV_REPLACE_DEVID) {
801 fs_devices->rw_devices++;
802 list_add(&device->dev_alloc_list,
803 &fs_devices->alloc_list);
810 blkdev_put(bdev, flags);
813 if (fs_devices->open_devices == 0) {
817 fs_devices->seeding = seeding;
818 fs_devices->opened = 1;
819 fs_devices->latest_bdev = latest_bdev;
820 fs_devices->latest_devid = latest_devid;
821 fs_devices->latest_trans = latest_transid;
822 fs_devices->total_rw_bytes = 0;
827 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
828 fmode_t flags, void *holder)
832 mutex_lock(&uuid_mutex);
833 if (fs_devices->opened) {
834 fs_devices->opened++;
837 ret = __btrfs_open_devices(fs_devices, flags, holder);
839 mutex_unlock(&uuid_mutex);
844 * Look for a btrfs signature on a device. This may be called out of the mount path
845 * and we are not allowed to call set_blocksize during the scan. The superblock
846 * is read via pagecache
848 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
849 struct btrfs_fs_devices **fs_devices_ret)
851 struct btrfs_super_block *disk_super;
852 struct block_device *bdev;
863 * we would like to check all the supers, but that would make
864 * a btrfs mount succeed after a mkfs from a different FS.
865 * So, we need to add a special mount option to scan for
866 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
868 bytenr = btrfs_sb_offset(0);
870 mutex_lock(&uuid_mutex);
872 bdev = blkdev_get_by_path(path, flags, holder);
879 /* make sure our super fits in the device */
880 if (bytenr + PAGE_CACHE_SIZE >= i_size_read(bdev->bd_inode))
883 /* make sure our super fits in the page */
884 if (sizeof(*disk_super) > PAGE_CACHE_SIZE)
887 /* make sure our super doesn't straddle pages on disk */
888 index = bytenr >> PAGE_CACHE_SHIFT;
889 if ((bytenr + sizeof(*disk_super) - 1) >> PAGE_CACHE_SHIFT != index)
892 /* pull in the page with our super */
893 page = read_cache_page_gfp(bdev->bd_inode->i_mapping,
896 if (IS_ERR_OR_NULL(page))
901 /* align our pointer to the offset of the super block */
902 disk_super = p + (bytenr & ~PAGE_CACHE_MASK);
904 if (btrfs_super_bytenr(disk_super) != bytenr ||
905 btrfs_super_magic(disk_super) != BTRFS_MAGIC)
908 devid = btrfs_stack_device_id(&disk_super->dev_item);
909 transid = btrfs_super_generation(disk_super);
910 total_devices = btrfs_super_num_devices(disk_super);
912 if (disk_super->label[0]) {
913 if (disk_super->label[BTRFS_LABEL_SIZE - 1])
914 disk_super->label[BTRFS_LABEL_SIZE - 1] = '\0';
915 printk(KERN_INFO "btrfs: device label %s ", disk_super->label);
917 printk(KERN_INFO "btrfs: device fsid %pU ", disk_super->fsid);
920 printk(KERN_CONT "devid %llu transid %llu %s\n", devid, transid, path);
922 ret = device_list_add(path, disk_super, devid, fs_devices_ret);
923 if (!ret && fs_devices_ret)
924 (*fs_devices_ret)->total_devices = total_devices;
928 page_cache_release(page);
931 blkdev_put(bdev, flags);
933 mutex_unlock(&uuid_mutex);
937 /* helper to account the used device space in the range */
938 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
939 u64 end, u64 *length)
941 struct btrfs_key key;
942 struct btrfs_root *root = device->dev_root;
943 struct btrfs_dev_extent *dev_extent;
944 struct btrfs_path *path;
948 struct extent_buffer *l;
952 if (start >= device->total_bytes || device->is_tgtdev_for_dev_replace)
955 path = btrfs_alloc_path();
960 key.objectid = device->devid;
962 key.type = BTRFS_DEV_EXTENT_KEY;
964 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
968 ret = btrfs_previous_item(root, path, key.objectid, key.type);
975 slot = path->slots[0];
976 if (slot >= btrfs_header_nritems(l)) {
977 ret = btrfs_next_leaf(root, path);
985 btrfs_item_key_to_cpu(l, &key, slot);
987 if (key.objectid < device->devid)
990 if (key.objectid > device->devid)
993 if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY)
996 dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
997 extent_end = key.offset + btrfs_dev_extent_length(l,
999 if (key.offset <= start && extent_end > end) {
1000 *length = end - start + 1;
1002 } else if (key.offset <= start && extent_end > start)
1003 *length += extent_end - start;
1004 else if (key.offset > start && extent_end <= end)
1005 *length += extent_end - key.offset;
1006 else if (key.offset > start && key.offset <= end) {
1007 *length += end - key.offset + 1;
1009 } else if (key.offset > end)
1017 btrfs_free_path(path);
1021 static int contains_pending_extent(struct btrfs_trans_handle *trans,
1022 struct btrfs_device *device,
1023 u64 *start, u64 len)
1025 struct extent_map *em;
1028 list_for_each_entry(em, &trans->transaction->pending_chunks, list) {
1029 struct map_lookup *map;
1032 map = (struct map_lookup *)em->bdev;
1033 for (i = 0; i < map->num_stripes; i++) {
1034 if (map->stripes[i].dev != device)
1036 if (map->stripes[i].physical >= *start + len ||
1037 map->stripes[i].physical + em->orig_block_len <=
1040 *start = map->stripes[i].physical +
1051 * find_free_dev_extent - find free space in the specified device
1052 * @device: the device which we search the free space in
1053 * @num_bytes: the size of the free space that we need
1054 * @start: store the start of the free space.
1055 * @len: the size of the free space. that we find, or the size of the max
1056 * free space if we don't find suitable free space
1058 * this uses a pretty simple search, the expectation is that it is
1059 * called very infrequently and that a given device has a small number
1062 * @start is used to store the start of the free space if we find. But if we
1063 * don't find suitable free space, it will be used to store the start position
1064 * of the max free space.
1066 * @len is used to store the size of the free space that we find.
1067 * But if we don't find suitable free space, it is used to store the size of
1068 * the max free space.
1070 int find_free_dev_extent(struct btrfs_trans_handle *trans,
1071 struct btrfs_device *device, u64 num_bytes,
1072 u64 *start, u64 *len)
1074 struct btrfs_key key;
1075 struct btrfs_root *root = device->dev_root;
1076 struct btrfs_dev_extent *dev_extent;
1077 struct btrfs_path *path;
1083 u64 search_end = device->total_bytes;
1086 struct extent_buffer *l;
1088 /* FIXME use last free of some kind */
1090 /* we don't want to overwrite the superblock on the drive,
1091 * so we make sure to start at an offset of at least 1MB
1093 search_start = max(root->fs_info->alloc_start, 1024ull * 1024);
1095 path = btrfs_alloc_path();
1099 max_hole_start = search_start;
1103 if (search_start >= search_end || device->is_tgtdev_for_dev_replace) {
1109 path->search_commit_root = 1;
1110 path->skip_locking = 1;
1112 key.objectid = device->devid;
1113 key.offset = search_start;
1114 key.type = BTRFS_DEV_EXTENT_KEY;
1116 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1120 ret = btrfs_previous_item(root, path, key.objectid, key.type);
1127 slot = path->slots[0];
1128 if (slot >= btrfs_header_nritems(l)) {
1129 ret = btrfs_next_leaf(root, path);
1137 btrfs_item_key_to_cpu(l, &key, slot);
1139 if (key.objectid < device->devid)
1142 if (key.objectid > device->devid)
1145 if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY)
1148 if (key.offset > search_start) {
1149 hole_size = key.offset - search_start;
1152 * Have to check before we set max_hole_start, otherwise
1153 * we could end up sending back this offset anyway.
1155 if (contains_pending_extent(trans, device,
1160 if (hole_size > max_hole_size) {
1161 max_hole_start = search_start;
1162 max_hole_size = hole_size;
1166 * If this free space is greater than which we need,
1167 * it must be the max free space that we have found
1168 * until now, so max_hole_start must point to the start
1169 * of this free space and the length of this free space
1170 * is stored in max_hole_size. Thus, we return
1171 * max_hole_start and max_hole_size and go back to the
1174 if (hole_size >= num_bytes) {
1180 dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
1181 extent_end = key.offset + btrfs_dev_extent_length(l,
1183 if (extent_end > search_start)
1184 search_start = extent_end;
1191 * At this point, search_start should be the end of
1192 * allocated dev extents, and when shrinking the device,
1193 * search_end may be smaller than search_start.
1195 if (search_end > search_start)
1196 hole_size = search_end - search_start;
1198 if (hole_size > max_hole_size) {
1199 max_hole_start = search_start;
1200 max_hole_size = hole_size;
1203 if (contains_pending_extent(trans, device, &search_start, hole_size)) {
1204 btrfs_release_path(path);
1209 if (hole_size < num_bytes)
1215 btrfs_free_path(path);
1216 *start = max_hole_start;
1218 *len = max_hole_size;
1222 static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans,
1223 struct btrfs_device *device,
1227 struct btrfs_path *path;
1228 struct btrfs_root *root = device->dev_root;
1229 struct btrfs_key key;
1230 struct btrfs_key found_key;
1231 struct extent_buffer *leaf = NULL;
1232 struct btrfs_dev_extent *extent = NULL;
1234 path = btrfs_alloc_path();
1238 key.objectid = device->devid;
1240 key.type = BTRFS_DEV_EXTENT_KEY;
1242 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
1244 ret = btrfs_previous_item(root, path, key.objectid,
1245 BTRFS_DEV_EXTENT_KEY);
1248 leaf = path->nodes[0];
1249 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1250 extent = btrfs_item_ptr(leaf, path->slots[0],
1251 struct btrfs_dev_extent);
1252 BUG_ON(found_key.offset > start || found_key.offset +
1253 btrfs_dev_extent_length(leaf, extent) < start);
1255 btrfs_release_path(path);
1257 } else if (ret == 0) {
1258 leaf = path->nodes[0];
1259 extent = btrfs_item_ptr(leaf, path->slots[0],
1260 struct btrfs_dev_extent);
1262 btrfs_error(root->fs_info, ret, "Slot search failed");
1266 if (device->bytes_used > 0) {
1267 u64 len = btrfs_dev_extent_length(leaf, extent);
1268 device->bytes_used -= len;
1269 spin_lock(&root->fs_info->free_chunk_lock);
1270 root->fs_info->free_chunk_space += len;
1271 spin_unlock(&root->fs_info->free_chunk_lock);
1273 ret = btrfs_del_item(trans, root, path);
1275 btrfs_error(root->fs_info, ret,
1276 "Failed to remove dev extent item");
1279 btrfs_free_path(path);
1283 static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
1284 struct btrfs_device *device,
1285 u64 chunk_tree, u64 chunk_objectid,
1286 u64 chunk_offset, u64 start, u64 num_bytes)
1289 struct btrfs_path *path;
1290 struct btrfs_root *root = device->dev_root;
1291 struct btrfs_dev_extent *extent;
1292 struct extent_buffer *leaf;
1293 struct btrfs_key key;
1295 WARN_ON(!device->in_fs_metadata);
1296 WARN_ON(device->is_tgtdev_for_dev_replace);
1297 path = btrfs_alloc_path();
1301 key.objectid = device->devid;
1303 key.type = BTRFS_DEV_EXTENT_KEY;
1304 ret = btrfs_insert_empty_item(trans, root, path, &key,
1309 leaf = path->nodes[0];
1310 extent = btrfs_item_ptr(leaf, path->slots[0],
1311 struct btrfs_dev_extent);
1312 btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree);
1313 btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid);
1314 btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset);
1316 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
1317 btrfs_dev_extent_chunk_tree_uuid(extent), BTRFS_UUID_SIZE);
1319 btrfs_set_dev_extent_length(leaf, extent, num_bytes);
1320 btrfs_mark_buffer_dirty(leaf);
1322 btrfs_free_path(path);
1326 static u64 find_next_chunk(struct btrfs_fs_info *fs_info)
1328 struct extent_map_tree *em_tree;
1329 struct extent_map *em;
1333 em_tree = &fs_info->mapping_tree.map_tree;
1334 read_lock(&em_tree->lock);
1335 n = rb_last(&em_tree->map);
1337 em = rb_entry(n, struct extent_map, rb_node);
1338 ret = em->start + em->len;
1340 read_unlock(&em_tree->lock);
1345 static noinline int find_next_devid(struct btrfs_fs_info *fs_info,
1349 struct btrfs_key key;
1350 struct btrfs_key found_key;
1351 struct btrfs_path *path;
1353 path = btrfs_alloc_path();
1357 key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
1358 key.type = BTRFS_DEV_ITEM_KEY;
1359 key.offset = (u64)-1;
1361 ret = btrfs_search_slot(NULL, fs_info->chunk_root, &key, path, 0, 0);
1365 BUG_ON(ret == 0); /* Corruption */
1367 ret = btrfs_previous_item(fs_info->chunk_root, path,
1368 BTRFS_DEV_ITEMS_OBJECTID,
1369 BTRFS_DEV_ITEM_KEY);
1373 btrfs_item_key_to_cpu(path->nodes[0], &found_key,
1375 *devid_ret = found_key.offset + 1;
1379 btrfs_free_path(path);
1384 * the device information is stored in the chunk root
1385 * the btrfs_device struct should be fully filled in
1387 static int btrfs_add_device(struct btrfs_trans_handle *trans,
1388 struct btrfs_root *root,
1389 struct btrfs_device *device)
1392 struct btrfs_path *path;
1393 struct btrfs_dev_item *dev_item;
1394 struct extent_buffer *leaf;
1395 struct btrfs_key key;
1398 root = root->fs_info->chunk_root;
1400 path = btrfs_alloc_path();
1404 key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
1405 key.type = BTRFS_DEV_ITEM_KEY;
1406 key.offset = device->devid;
1408 ret = btrfs_insert_empty_item(trans, root, path, &key,
1413 leaf = path->nodes[0];
1414 dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item);
1416 btrfs_set_device_id(leaf, dev_item, device->devid);
1417 btrfs_set_device_generation(leaf, dev_item, 0);
1418 btrfs_set_device_type(leaf, dev_item, device->type);
1419 btrfs_set_device_io_align(leaf, dev_item, device->io_align);
1420 btrfs_set_device_io_width(leaf, dev_item, device->io_width);
1421 btrfs_set_device_sector_size(leaf, dev_item, device->sector_size);
1422 btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes);
1423 btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used);
1424 btrfs_set_device_group(leaf, dev_item, 0);
1425 btrfs_set_device_seek_speed(leaf, dev_item, 0);
1426 btrfs_set_device_bandwidth(leaf, dev_item, 0);
1427 btrfs_set_device_start_offset(leaf, dev_item, 0);
1429 ptr = btrfs_device_uuid(dev_item);
1430 write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE);
1431 ptr = btrfs_device_fsid(dev_item);
1432 write_extent_buffer(leaf, root->fs_info->fsid, ptr, BTRFS_UUID_SIZE);
1433 btrfs_mark_buffer_dirty(leaf);
1437 btrfs_free_path(path);
1441 static int btrfs_rm_dev_item(struct btrfs_root *root,
1442 struct btrfs_device *device)
1445 struct btrfs_path *path;
1446 struct btrfs_key key;
1447 struct btrfs_trans_handle *trans;
1449 root = root->fs_info->chunk_root;
1451 path = btrfs_alloc_path();
1455 trans = btrfs_start_transaction(root, 0);
1456 if (IS_ERR(trans)) {
1457 btrfs_free_path(path);
1458 return PTR_ERR(trans);
1460 key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
1461 key.type = BTRFS_DEV_ITEM_KEY;
1462 key.offset = device->devid;
1465 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
1474 ret = btrfs_del_item(trans, root, path);
1478 btrfs_free_path(path);
1479 unlock_chunks(root);
1480 btrfs_commit_transaction(trans, root);
1484 int btrfs_rm_device(struct btrfs_root *root, char *device_path)
1486 struct btrfs_device *device;
1487 struct btrfs_device *next_device;
1488 struct block_device *bdev;
1489 struct buffer_head *bh = NULL;
1490 struct btrfs_super_block *disk_super;
1491 struct btrfs_fs_devices *cur_devices;
1498 bool clear_super = false;
1500 mutex_lock(&uuid_mutex);
1503 seq = read_seqbegin(&root->fs_info->profiles_lock);
1505 all_avail = root->fs_info->avail_data_alloc_bits |
1506 root->fs_info->avail_system_alloc_bits |
1507 root->fs_info->avail_metadata_alloc_bits;
1508 } while (read_seqretry(&root->fs_info->profiles_lock, seq));
1510 num_devices = root->fs_info->fs_devices->num_devices;
1511 btrfs_dev_replace_lock(&root->fs_info->dev_replace);
1512 if (btrfs_dev_replace_is_ongoing(&root->fs_info->dev_replace)) {
1513 WARN_ON(num_devices < 1);
1516 btrfs_dev_replace_unlock(&root->fs_info->dev_replace);
1518 if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) && num_devices <= 4) {
1519 ret = BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET;
1523 if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) && num_devices <= 2) {
1524 ret = BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET;
1528 if ((all_avail & BTRFS_BLOCK_GROUP_RAID5) &&
1529 root->fs_info->fs_devices->rw_devices <= 2) {
1530 ret = BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET;
1533 if ((all_avail & BTRFS_BLOCK_GROUP_RAID6) &&
1534 root->fs_info->fs_devices->rw_devices <= 3) {
1535 ret = BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET;
1539 if (strcmp(device_path, "missing") == 0) {
1540 struct list_head *devices;
1541 struct btrfs_device *tmp;
1544 devices = &root->fs_info->fs_devices->devices;
1546 * It is safe to read the devices since the volume_mutex
1549 list_for_each_entry(tmp, devices, dev_list) {
1550 if (tmp->in_fs_metadata &&
1551 !tmp->is_tgtdev_for_dev_replace &&
1561 ret = BTRFS_ERROR_DEV_MISSING_NOT_FOUND;
1565 ret = btrfs_get_bdev_and_sb(device_path,
1566 FMODE_WRITE | FMODE_EXCL,
1567 root->fs_info->bdev_holder, 0,
1571 disk_super = (struct btrfs_super_block *)bh->b_data;
1572 devid = btrfs_stack_device_id(&disk_super->dev_item);
1573 dev_uuid = disk_super->dev_item.uuid;
1574 device = btrfs_find_device(root->fs_info, devid, dev_uuid,
1582 if (device->is_tgtdev_for_dev_replace) {
1583 ret = BTRFS_ERROR_DEV_TGT_REPLACE;
1587 if (device->writeable && root->fs_info->fs_devices->rw_devices == 1) {
1588 ret = BTRFS_ERROR_DEV_ONLY_WRITABLE;
1592 if (device->writeable) {
1594 list_del_init(&device->dev_alloc_list);
1595 unlock_chunks(root);
1596 root->fs_info->fs_devices->rw_devices--;
1600 mutex_unlock(&uuid_mutex);
1601 ret = btrfs_shrink_device(device, 0);
1602 mutex_lock(&uuid_mutex);
1607 * TODO: the superblock still includes this device in its num_devices
1608 * counter although write_all_supers() is not locked out. This
1609 * could give a filesystem state which requires a degraded mount.
1611 ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device);
1615 spin_lock(&root->fs_info->free_chunk_lock);
1616 root->fs_info->free_chunk_space = device->total_bytes -
1618 spin_unlock(&root->fs_info->free_chunk_lock);
1620 device->in_fs_metadata = 0;
1621 btrfs_scrub_cancel_dev(root->fs_info, device);
1624 * the device list mutex makes sure that we don't change
1625 * the device list while someone else is writing out all
1626 * the device supers. Whoever is writing all supers, should
1627 * lock the device list mutex before getting the number of
1628 * devices in the super block (super_copy). Conversely,
1629 * whoever updates the number of devices in the super block
1630 * (super_copy) should hold the device list mutex.
1633 cur_devices = device->fs_devices;
1634 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
1635 list_del_rcu(&device->dev_list);
1637 device->fs_devices->num_devices--;
1638 device->fs_devices->total_devices--;
1640 if (device->missing)
1641 root->fs_info->fs_devices->missing_devices--;
1643 next_device = list_entry(root->fs_info->fs_devices->devices.next,
1644 struct btrfs_device, dev_list);
1645 if (device->bdev == root->fs_info->sb->s_bdev)
1646 root->fs_info->sb->s_bdev = next_device->bdev;
1647 if (device->bdev == root->fs_info->fs_devices->latest_bdev)
1648 root->fs_info->fs_devices->latest_bdev = next_device->bdev;
1651 device->fs_devices->open_devices--;
1653 call_rcu(&device->rcu, free_device);
1655 num_devices = btrfs_super_num_devices(root->fs_info->super_copy) - 1;
1656 btrfs_set_super_num_devices(root->fs_info->super_copy, num_devices);
1657 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
1659 if (cur_devices->open_devices == 0) {
1660 struct btrfs_fs_devices *fs_devices;
1661 fs_devices = root->fs_info->fs_devices;
1662 while (fs_devices) {
1663 if (fs_devices->seed == cur_devices)
1665 fs_devices = fs_devices->seed;
1667 fs_devices->seed = cur_devices->seed;
1668 cur_devices->seed = NULL;
1670 __btrfs_close_devices(cur_devices);
1671 unlock_chunks(root);
1672 free_fs_devices(cur_devices);
1675 root->fs_info->num_tolerated_disk_barrier_failures =
1676 btrfs_calc_num_tolerated_disk_barrier_failures(root->fs_info);
1679 * at this point, the device is zero sized. We want to
1680 * remove it from the devices list and zero out the old super
1682 if (clear_super && disk_super) {
1683 /* make sure this device isn't detected as part of
1686 memset(&disk_super->magic, 0, sizeof(disk_super->magic));
1687 set_buffer_dirty(bh);
1688 sync_dirty_buffer(bh);
1693 /* Notify udev that device has changed */
1695 btrfs_kobject_uevent(bdev, KOBJ_CHANGE);
1700 blkdev_put(bdev, FMODE_READ | FMODE_EXCL);
1702 mutex_unlock(&uuid_mutex);
1705 if (device->writeable) {
1707 list_add(&device->dev_alloc_list,
1708 &root->fs_info->fs_devices->alloc_list);
1709 unlock_chunks(root);
1710 root->fs_info->fs_devices->rw_devices++;
1715 void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
1716 struct btrfs_device *srcdev)
1718 WARN_ON(!mutex_is_locked(&fs_info->fs_devices->device_list_mutex));
1719 list_del_rcu(&srcdev->dev_list);
1720 list_del_rcu(&srcdev->dev_alloc_list);
1721 fs_info->fs_devices->num_devices--;
1722 if (srcdev->missing) {
1723 fs_info->fs_devices->missing_devices--;
1724 fs_info->fs_devices->rw_devices++;
1726 if (srcdev->can_discard)
1727 fs_info->fs_devices->num_can_discard--;
1729 fs_info->fs_devices->open_devices--;
1731 call_rcu(&srcdev->rcu, free_device);
1734 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
1735 struct btrfs_device *tgtdev)
1737 struct btrfs_device *next_device;
1740 mutex_lock(&fs_info->fs_devices->device_list_mutex);
1742 btrfs_scratch_superblock(tgtdev);
1743 fs_info->fs_devices->open_devices--;
1745 fs_info->fs_devices->num_devices--;
1746 if (tgtdev->can_discard)
1747 fs_info->fs_devices->num_can_discard++;
1749 next_device = list_entry(fs_info->fs_devices->devices.next,
1750 struct btrfs_device, dev_list);
1751 if (tgtdev->bdev == fs_info->sb->s_bdev)
1752 fs_info->sb->s_bdev = next_device->bdev;
1753 if (tgtdev->bdev == fs_info->fs_devices->latest_bdev)
1754 fs_info->fs_devices->latest_bdev = next_device->bdev;
1755 list_del_rcu(&tgtdev->dev_list);
1757 call_rcu(&tgtdev->rcu, free_device);
1759 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
1762 static int btrfs_find_device_by_path(struct btrfs_root *root, char *device_path,
1763 struct btrfs_device **device)
1766 struct btrfs_super_block *disk_super;
1769 struct block_device *bdev;
1770 struct buffer_head *bh;
1773 ret = btrfs_get_bdev_and_sb(device_path, FMODE_READ,
1774 root->fs_info->bdev_holder, 0, &bdev, &bh);
1777 disk_super = (struct btrfs_super_block *)bh->b_data;
1778 devid = btrfs_stack_device_id(&disk_super->dev_item);
1779 dev_uuid = disk_super->dev_item.uuid;
1780 *device = btrfs_find_device(root->fs_info, devid, dev_uuid,
1785 blkdev_put(bdev, FMODE_READ);
1789 int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
1791 struct btrfs_device **device)
1794 if (strcmp(device_path, "missing") == 0) {
1795 struct list_head *devices;
1796 struct btrfs_device *tmp;
1798 devices = &root->fs_info->fs_devices->devices;
1800 * It is safe to read the devices since the volume_mutex
1801 * is held by the caller.
1803 list_for_each_entry(tmp, devices, dev_list) {
1804 if (tmp->in_fs_metadata && !tmp->bdev) {
1811 pr_err("btrfs: no missing device found\n");
1817 return btrfs_find_device_by_path(root, device_path, device);
1822 * does all the dirty work required for changing file system's UUID.
1824 static int btrfs_prepare_sprout(struct btrfs_root *root)
1826 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
1827 struct btrfs_fs_devices *old_devices;
1828 struct btrfs_fs_devices *seed_devices;
1829 struct btrfs_super_block *disk_super = root->fs_info->super_copy;
1830 struct btrfs_device *device;
1833 BUG_ON(!mutex_is_locked(&uuid_mutex));
1834 if (!fs_devices->seeding)
1837 seed_devices = __alloc_fs_devices();
1838 if (IS_ERR(seed_devices))
1839 return PTR_ERR(seed_devices);
1841 old_devices = clone_fs_devices(fs_devices);
1842 if (IS_ERR(old_devices)) {
1843 kfree(seed_devices);
1844 return PTR_ERR(old_devices);
1847 list_add(&old_devices->list, &fs_uuids);
1849 memcpy(seed_devices, fs_devices, sizeof(*seed_devices));
1850 seed_devices->opened = 1;
1851 INIT_LIST_HEAD(&seed_devices->devices);
1852 INIT_LIST_HEAD(&seed_devices->alloc_list);
1853 mutex_init(&seed_devices->device_list_mutex);
1855 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
1856 list_splice_init_rcu(&fs_devices->devices, &seed_devices->devices,
1859 list_splice_init(&fs_devices->alloc_list, &seed_devices->alloc_list);
1860 list_for_each_entry(device, &seed_devices->devices, dev_list) {
1861 device->fs_devices = seed_devices;
1864 fs_devices->seeding = 0;
1865 fs_devices->num_devices = 0;
1866 fs_devices->open_devices = 0;
1867 fs_devices->total_devices = 0;
1868 fs_devices->seed = seed_devices;
1870 generate_random_uuid(fs_devices->fsid);
1871 memcpy(root->fs_info->fsid, fs_devices->fsid, BTRFS_FSID_SIZE);
1872 memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE);
1873 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
1875 super_flags = btrfs_super_flags(disk_super) &
1876 ~BTRFS_SUPER_FLAG_SEEDING;
1877 btrfs_set_super_flags(disk_super, super_flags);
1883 * strore the expected generation for seed devices in device items.
1885 static int btrfs_finish_sprout(struct btrfs_trans_handle *trans,
1886 struct btrfs_root *root)
1888 struct btrfs_path *path;
1889 struct extent_buffer *leaf;
1890 struct btrfs_dev_item *dev_item;
1891 struct btrfs_device *device;
1892 struct btrfs_key key;
1893 u8 fs_uuid[BTRFS_UUID_SIZE];
1894 u8 dev_uuid[BTRFS_UUID_SIZE];
1898 path = btrfs_alloc_path();
1902 root = root->fs_info->chunk_root;
1903 key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
1905 key.type = BTRFS_DEV_ITEM_KEY;
1908 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
1912 leaf = path->nodes[0];
1914 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
1915 ret = btrfs_next_leaf(root, path);
1920 leaf = path->nodes[0];
1921 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
1922 btrfs_release_path(path);
1926 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
1927 if (key.objectid != BTRFS_DEV_ITEMS_OBJECTID ||
1928 key.type != BTRFS_DEV_ITEM_KEY)
1931 dev_item = btrfs_item_ptr(leaf, path->slots[0],
1932 struct btrfs_dev_item);
1933 devid = btrfs_device_id(leaf, dev_item);
1934 read_extent_buffer(leaf, dev_uuid, btrfs_device_uuid(dev_item),
1936 read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item),
1938 device = btrfs_find_device(root->fs_info, devid, dev_uuid,
1940 BUG_ON(!device); /* Logic error */
1942 if (device->fs_devices->seeding) {
1943 btrfs_set_device_generation(leaf, dev_item,
1944 device->generation);
1945 btrfs_mark_buffer_dirty(leaf);
1953 btrfs_free_path(path);
1957 int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
1959 struct request_queue *q;
1960 struct btrfs_trans_handle *trans;
1961 struct btrfs_device *device;
1962 struct block_device *bdev;
1963 struct list_head *devices;
1964 struct super_block *sb = root->fs_info->sb;
1965 struct rcu_string *name;
1967 int seeding_dev = 0;
1970 if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding)
1973 bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL,
1974 root->fs_info->bdev_holder);
1976 return PTR_ERR(bdev);
1978 if (root->fs_info->fs_devices->seeding) {
1980 down_write(&sb->s_umount);
1981 mutex_lock(&uuid_mutex);
1984 filemap_write_and_wait(bdev->bd_inode->i_mapping);
1986 devices = &root->fs_info->fs_devices->devices;
1988 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
1989 list_for_each_entry(device, devices, dev_list) {
1990 if (device->bdev == bdev) {
1993 &root->fs_info->fs_devices->device_list_mutex);
1997 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
1999 device = btrfs_alloc_device(root->fs_info, NULL, NULL);
2000 if (IS_ERR(device)) {
2001 /* we can safely leave the fs_devices entry around */
2002 ret = PTR_ERR(device);
2006 name = rcu_string_strdup(device_path, GFP_NOFS);
2012 rcu_assign_pointer(device->name, name);
2014 trans = btrfs_start_transaction(root, 0);
2015 if (IS_ERR(trans)) {
2016 rcu_string_free(device->name);
2018 ret = PTR_ERR(trans);
2024 q = bdev_get_queue(bdev);
2025 if (blk_queue_discard(q))
2026 device->can_discard = 1;
2027 device->writeable = 1;
2028 device->generation = trans->transid;
2029 device->io_width = root->sectorsize;
2030 device->io_align = root->sectorsize;
2031 device->sector_size = root->sectorsize;
2032 device->total_bytes = i_size_read(bdev->bd_inode);
2033 device->disk_total_bytes = device->total_bytes;
2034 device->dev_root = root->fs_info->dev_root;
2035 device->bdev = bdev;
2036 device->in_fs_metadata = 1;
2037 device->is_tgtdev_for_dev_replace = 0;
2038 device->mode = FMODE_EXCL;
2039 set_blocksize(device->bdev, 4096);
2042 sb->s_flags &= ~MS_RDONLY;
2043 ret = btrfs_prepare_sprout(root);
2044 BUG_ON(ret); /* -ENOMEM */
2047 device->fs_devices = root->fs_info->fs_devices;
2049 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
2050 list_add_rcu(&device->dev_list, &root->fs_info->fs_devices->devices);
2051 list_add(&device->dev_alloc_list,
2052 &root->fs_info->fs_devices->alloc_list);
2053 root->fs_info->fs_devices->num_devices++;
2054 root->fs_info->fs_devices->open_devices++;
2055 root->fs_info->fs_devices->rw_devices++;
2056 root->fs_info->fs_devices->total_devices++;
2057 if (device->can_discard)
2058 root->fs_info->fs_devices->num_can_discard++;
2059 root->fs_info->fs_devices->total_rw_bytes += device->total_bytes;
2061 spin_lock(&root->fs_info->free_chunk_lock);
2062 root->fs_info->free_chunk_space += device->total_bytes;
2063 spin_unlock(&root->fs_info->free_chunk_lock);
2065 if (!blk_queue_nonrot(bdev_get_queue(bdev)))
2066 root->fs_info->fs_devices->rotating = 1;
2068 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
2069 btrfs_set_super_total_bytes(root->fs_info->super_copy,
2070 total_bytes + device->total_bytes);
2072 total_bytes = btrfs_super_num_devices(root->fs_info->super_copy);
2073 btrfs_set_super_num_devices(root->fs_info->super_copy,
2075 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
2078 ret = init_first_rw_device(trans, root, device);
2080 btrfs_abort_transaction(trans, root, ret);
2083 ret = btrfs_finish_sprout(trans, root);
2085 btrfs_abort_transaction(trans, root, ret);
2089 ret = btrfs_add_device(trans, root, device);
2091 btrfs_abort_transaction(trans, root, ret);
2097 * we've got more storage, clear any full flags on the space
2100 btrfs_clear_space_info_full(root->fs_info);
2102 unlock_chunks(root);
2103 root->fs_info->num_tolerated_disk_barrier_failures =
2104 btrfs_calc_num_tolerated_disk_barrier_failures(root->fs_info);
2105 ret = btrfs_commit_transaction(trans, root);
2108 mutex_unlock(&uuid_mutex);
2109 up_write(&sb->s_umount);
2111 if (ret) /* transaction commit */
2114 ret = btrfs_relocate_sys_chunks(root);
2116 btrfs_error(root->fs_info, ret,
2117 "Failed to relocate sys chunks after "
2118 "device initialization. This can be fixed "
2119 "using the \"btrfs balance\" command.");
2120 trans = btrfs_attach_transaction(root);
2121 if (IS_ERR(trans)) {
2122 if (PTR_ERR(trans) == -ENOENT)
2124 return PTR_ERR(trans);
2126 ret = btrfs_commit_transaction(trans, root);
2132 unlock_chunks(root);
2133 btrfs_end_transaction(trans, root);
2134 rcu_string_free(device->name);
2137 blkdev_put(bdev, FMODE_EXCL);
2139 mutex_unlock(&uuid_mutex);
2140 up_write(&sb->s_umount);
2145 int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
2146 struct btrfs_device **device_out)
2148 struct request_queue *q;
2149 struct btrfs_device *device;
2150 struct block_device *bdev;
2151 struct btrfs_fs_info *fs_info = root->fs_info;
2152 struct list_head *devices;
2153 struct rcu_string *name;
2154 u64 devid = BTRFS_DEV_REPLACE_DEVID;
2158 if (fs_info->fs_devices->seeding)
2161 bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL,
2162 fs_info->bdev_holder);
2164 return PTR_ERR(bdev);
2166 filemap_write_and_wait(bdev->bd_inode->i_mapping);
2168 devices = &fs_info->fs_devices->devices;
2169 list_for_each_entry(device, devices, dev_list) {
2170 if (device->bdev == bdev) {
2176 device = btrfs_alloc_device(NULL, &devid, NULL);
2177 if (IS_ERR(device)) {
2178 ret = PTR_ERR(device);
2182 name = rcu_string_strdup(device_path, GFP_NOFS);
2188 rcu_assign_pointer(device->name, name);
2190 q = bdev_get_queue(bdev);
2191 if (blk_queue_discard(q))
2192 device->can_discard = 1;
2193 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
2194 device->writeable = 1;
2195 device->generation = 0;
2196 device->io_width = root->sectorsize;
2197 device->io_align = root->sectorsize;
2198 device->sector_size = root->sectorsize;
2199 device->total_bytes = i_size_read(bdev->bd_inode);
2200 device->disk_total_bytes = device->total_bytes;
2201 device->dev_root = fs_info->dev_root;
2202 device->bdev = bdev;
2203 device->in_fs_metadata = 1;
2204 device->is_tgtdev_for_dev_replace = 1;
2205 device->mode = FMODE_EXCL;
2206 set_blocksize(device->bdev, 4096);
2207 device->fs_devices = fs_info->fs_devices;
2208 list_add(&device->dev_list, &fs_info->fs_devices->devices);
2209 fs_info->fs_devices->num_devices++;
2210 fs_info->fs_devices->open_devices++;
2211 if (device->can_discard)
2212 fs_info->fs_devices->num_can_discard++;
2213 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
2215 *device_out = device;
2219 blkdev_put(bdev, FMODE_EXCL);
2223 void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
2224 struct btrfs_device *tgtdev)
2226 WARN_ON(fs_info->fs_devices->rw_devices == 0);
2227 tgtdev->io_width = fs_info->dev_root->sectorsize;
2228 tgtdev->io_align = fs_info->dev_root->sectorsize;
2229 tgtdev->sector_size = fs_info->dev_root->sectorsize;
2230 tgtdev->dev_root = fs_info->dev_root;
2231 tgtdev->in_fs_metadata = 1;
2234 static noinline int btrfs_update_device(struct btrfs_trans_handle *trans,
2235 struct btrfs_device *device)
2238 struct btrfs_path *path;
2239 struct btrfs_root *root;
2240 struct btrfs_dev_item *dev_item;
2241 struct extent_buffer *leaf;
2242 struct btrfs_key key;
2244 root = device->dev_root->fs_info->chunk_root;
2246 path = btrfs_alloc_path();
2250 key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
2251 key.type = BTRFS_DEV_ITEM_KEY;
2252 key.offset = device->devid;
2254 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
2263 leaf = path->nodes[0];
2264 dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item);
2266 btrfs_set_device_id(leaf, dev_item, device->devid);
2267 btrfs_set_device_type(leaf, dev_item, device->type);
2268 btrfs_set_device_io_align(leaf, dev_item, device->io_align);
2269 btrfs_set_device_io_width(leaf, dev_item, device->io_width);
2270 btrfs_set_device_sector_size(leaf, dev_item, device->sector_size);
2271 btrfs_set_device_total_bytes(leaf, dev_item, device->disk_total_bytes);
2272 btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used);
2273 btrfs_mark_buffer_dirty(leaf);
2276 btrfs_free_path(path);
2280 static int __btrfs_grow_device(struct btrfs_trans_handle *trans,
2281 struct btrfs_device *device, u64 new_size)
2283 struct btrfs_super_block *super_copy =
2284 device->dev_root->fs_info->super_copy;
2285 u64 old_total = btrfs_super_total_bytes(super_copy);
2286 u64 diff = new_size - device->total_bytes;
2288 if (!device->writeable)
2290 if (new_size <= device->total_bytes ||
2291 device->is_tgtdev_for_dev_replace)
2294 btrfs_set_super_total_bytes(super_copy, old_total + diff);
2295 device->fs_devices->total_rw_bytes += diff;
2297 device->total_bytes = new_size;
2298 device->disk_total_bytes = new_size;
2299 btrfs_clear_space_info_full(device->dev_root->fs_info);
2301 return btrfs_update_device(trans, device);
2304 int btrfs_grow_device(struct btrfs_trans_handle *trans,
2305 struct btrfs_device *device, u64 new_size)
2308 lock_chunks(device->dev_root);
2309 ret = __btrfs_grow_device(trans, device, new_size);
2310 unlock_chunks(device->dev_root);
2314 static int btrfs_free_chunk(struct btrfs_trans_handle *trans,
2315 struct btrfs_root *root,
2316 u64 chunk_tree, u64 chunk_objectid,
2320 struct btrfs_path *path;
2321 struct btrfs_key key;
2323 root = root->fs_info->chunk_root;
2324 path = btrfs_alloc_path();
2328 key.objectid = chunk_objectid;
2329 key.offset = chunk_offset;
2330 key.type = BTRFS_CHUNK_ITEM_KEY;
2332 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
2335 else if (ret > 0) { /* Logic error or corruption */
2336 btrfs_error(root->fs_info, -ENOENT,
2337 "Failed lookup while freeing chunk.");
2342 ret = btrfs_del_item(trans, root, path);
2344 btrfs_error(root->fs_info, ret,
2345 "Failed to delete chunk item.");
2347 btrfs_free_path(path);
2351 static int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64
2354 struct btrfs_super_block *super_copy = root->fs_info->super_copy;
2355 struct btrfs_disk_key *disk_key;
2356 struct btrfs_chunk *chunk;
2363 struct btrfs_key key;
2365 array_size = btrfs_super_sys_array_size(super_copy);
2367 ptr = super_copy->sys_chunk_array;
2370 while (cur < array_size) {
2371 disk_key = (struct btrfs_disk_key *)ptr;
2372 btrfs_disk_key_to_cpu(&key, disk_key);
2374 len = sizeof(*disk_key);
2376 if (key.type == BTRFS_CHUNK_ITEM_KEY) {
2377 chunk = (struct btrfs_chunk *)(ptr + len);
2378 num_stripes = btrfs_stack_chunk_num_stripes(chunk);
2379 len += btrfs_chunk_item_size(num_stripes);
2384 if (key.objectid == chunk_objectid &&
2385 key.offset == chunk_offset) {
2386 memmove(ptr, ptr + len, array_size - (cur + len));
2388 btrfs_set_super_sys_array_size(super_copy, array_size);
2397 static int btrfs_relocate_chunk(struct btrfs_root *root,
2398 u64 chunk_tree, u64 chunk_objectid,
2401 struct extent_map_tree *em_tree;
2402 struct btrfs_root *extent_root;
2403 struct btrfs_trans_handle *trans;
2404 struct extent_map *em;
2405 struct map_lookup *map;
2409 root = root->fs_info->chunk_root;
2410 extent_root = root->fs_info->extent_root;
2411 em_tree = &root->fs_info->mapping_tree.map_tree;
2413 ret = btrfs_can_relocate(extent_root, chunk_offset);
2417 /* step one, relocate all the extents inside this chunk */
2418 ret = btrfs_relocate_block_group(extent_root, chunk_offset);
2422 trans = btrfs_start_transaction(root, 0);
2423 if (IS_ERR(trans)) {
2424 ret = PTR_ERR(trans);
2425 btrfs_std_error(root->fs_info, ret);
2432 * step two, delete the device extents and the
2433 * chunk tree entries
2435 read_lock(&em_tree->lock);
2436 em = lookup_extent_mapping(em_tree, chunk_offset, 1);
2437 read_unlock(&em_tree->lock);
2439 BUG_ON(!em || em->start > chunk_offset ||
2440 em->start + em->len < chunk_offset);
2441 map = (struct map_lookup *)em->bdev;
2443 for (i = 0; i < map->num_stripes; i++) {
2444 ret = btrfs_free_dev_extent(trans, map->stripes[i].dev,
2445 map->stripes[i].physical);
2448 if (map->stripes[i].dev) {
2449 ret = btrfs_update_device(trans, map->stripes[i].dev);
2453 ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid,
2458 trace_btrfs_chunk_free(root, map, chunk_offset, em->len);
2460 if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) {
2461 ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset);
2465 ret = btrfs_remove_block_group(trans, extent_root, chunk_offset);
2468 write_lock(&em_tree->lock);
2469 remove_extent_mapping(em_tree, em);
2470 write_unlock(&em_tree->lock);
2475 /* once for the tree */
2476 free_extent_map(em);
2478 free_extent_map(em);
2480 unlock_chunks(root);
2481 btrfs_end_transaction(trans, root);
2485 static int btrfs_relocate_sys_chunks(struct btrfs_root *root)
2487 struct btrfs_root *chunk_root = root->fs_info->chunk_root;
2488 struct btrfs_path *path;
2489 struct extent_buffer *leaf;
2490 struct btrfs_chunk *chunk;
2491 struct btrfs_key key;
2492 struct btrfs_key found_key;
2493 u64 chunk_tree = chunk_root->root_key.objectid;
2495 bool retried = false;
2499 path = btrfs_alloc_path();
2504 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
2505 key.offset = (u64)-1;
2506 key.type = BTRFS_CHUNK_ITEM_KEY;
2509 ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0);
2512 BUG_ON(ret == 0); /* Corruption */
2514 ret = btrfs_previous_item(chunk_root, path, key.objectid,
2521 leaf = path->nodes[0];
2522 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2524 chunk = btrfs_item_ptr(leaf, path->slots[0],
2525 struct btrfs_chunk);
2526 chunk_type = btrfs_chunk_type(leaf, chunk);
2527 btrfs_release_path(path);
2529 if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) {
2530 ret = btrfs_relocate_chunk(chunk_root, chunk_tree,
2539 if (found_key.offset == 0)
2541 key.offset = found_key.offset - 1;
2544 if (failed && !retried) {
2548 } else if (failed && retried) {
2553 btrfs_free_path(path);
2557 static int insert_balance_item(struct btrfs_root *root,
2558 struct btrfs_balance_control *bctl)
2560 struct btrfs_trans_handle *trans;
2561 struct btrfs_balance_item *item;
2562 struct btrfs_disk_balance_args disk_bargs;
2563 struct btrfs_path *path;
2564 struct extent_buffer *leaf;
2565 struct btrfs_key key;
2568 path = btrfs_alloc_path();
2572 trans = btrfs_start_transaction(root, 0);
2573 if (IS_ERR(trans)) {
2574 btrfs_free_path(path);
2575 return PTR_ERR(trans);
2578 key.objectid = BTRFS_BALANCE_OBJECTID;
2579 key.type = BTRFS_BALANCE_ITEM_KEY;
2582 ret = btrfs_insert_empty_item(trans, root, path, &key,
2587 leaf = path->nodes[0];
2588 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item);
2590 memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item));
2592 btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->data);
2593 btrfs_set_balance_data(leaf, item, &disk_bargs);
2594 btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->meta);
2595 btrfs_set_balance_meta(leaf, item, &disk_bargs);
2596 btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->sys);
2597 btrfs_set_balance_sys(leaf, item, &disk_bargs);
2599 btrfs_set_balance_flags(leaf, item, bctl->flags);
2601 btrfs_mark_buffer_dirty(leaf);
2603 btrfs_free_path(path);
2604 err = btrfs_commit_transaction(trans, root);
2610 static int del_balance_item(struct btrfs_root *root)
2612 struct btrfs_trans_handle *trans;
2613 struct btrfs_path *path;
2614 struct btrfs_key key;
2617 path = btrfs_alloc_path();
2621 trans = btrfs_start_transaction(root, 0);
2622 if (IS_ERR(trans)) {
2623 btrfs_free_path(path);
2624 return PTR_ERR(trans);
2627 key.objectid = BTRFS_BALANCE_OBJECTID;
2628 key.type = BTRFS_BALANCE_ITEM_KEY;
2631 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
2639 ret = btrfs_del_item(trans, root, path);
2641 btrfs_free_path(path);
2642 err = btrfs_commit_transaction(trans, root);
2649 * This is a heuristic used to reduce the number of chunks balanced on
2650 * resume after balance was interrupted.
2652 static void update_balance_args(struct btrfs_balance_control *bctl)
2655 * Turn on soft mode for chunk types that were being converted.
2657 if (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT)
2658 bctl->data.flags |= BTRFS_BALANCE_ARGS_SOFT;
2659 if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT)
2660 bctl->sys.flags |= BTRFS_BALANCE_ARGS_SOFT;
2661 if (bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT)
2662 bctl->meta.flags |= BTRFS_BALANCE_ARGS_SOFT;
2665 * Turn on usage filter if is not already used. The idea is
2666 * that chunks that we have already balanced should be
2667 * reasonably full. Don't do it for chunks that are being
2668 * converted - that will keep us from relocating unconverted
2669 * (albeit full) chunks.
2671 if (!(bctl->data.flags & BTRFS_BALANCE_ARGS_USAGE) &&
2672 !(bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT)) {
2673 bctl->data.flags |= BTRFS_BALANCE_ARGS_USAGE;
2674 bctl->data.usage = 90;
2676 if (!(bctl->sys.flags & BTRFS_BALANCE_ARGS_USAGE) &&
2677 !(bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT)) {
2678 bctl->sys.flags |= BTRFS_BALANCE_ARGS_USAGE;
2679 bctl->sys.usage = 90;
2681 if (!(bctl->meta.flags & BTRFS_BALANCE_ARGS_USAGE) &&
2682 !(bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT)) {
2683 bctl->meta.flags |= BTRFS_BALANCE_ARGS_USAGE;
2684 bctl->meta.usage = 90;
2689 * Should be called with both balance and volume mutexes held to
2690 * serialize other volume operations (add_dev/rm_dev/resize) with
2691 * restriper. Same goes for unset_balance_control.
2693 static void set_balance_control(struct btrfs_balance_control *bctl)
2695 struct btrfs_fs_info *fs_info = bctl->fs_info;
2697 BUG_ON(fs_info->balance_ctl);
2699 spin_lock(&fs_info->balance_lock);
2700 fs_info->balance_ctl = bctl;
2701 spin_unlock(&fs_info->balance_lock);
2704 static void unset_balance_control(struct btrfs_fs_info *fs_info)
2706 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
2708 BUG_ON(!fs_info->balance_ctl);
2710 spin_lock(&fs_info->balance_lock);
2711 fs_info->balance_ctl = NULL;
2712 spin_unlock(&fs_info->balance_lock);
2718 * Balance filters. Return 1 if chunk should be filtered out
2719 * (should not be balanced).
2721 static int chunk_profiles_filter(u64 chunk_type,
2722 struct btrfs_balance_args *bargs)
2724 chunk_type = chunk_to_extended(chunk_type) &
2725 BTRFS_EXTENDED_PROFILE_MASK;
2727 if (bargs->profiles & chunk_type)
2733 static int chunk_usage_filter(struct btrfs_fs_info *fs_info, u64 chunk_offset,
2734 struct btrfs_balance_args *bargs)
2736 struct btrfs_block_group_cache *cache;
2737 u64 chunk_used, user_thresh;
2740 cache = btrfs_lookup_block_group(fs_info, chunk_offset);
2741 chunk_used = btrfs_block_group_used(&cache->item);
2743 if (bargs->usage == 0)
2745 else if (bargs->usage > 100)
2746 user_thresh = cache->key.offset;
2748 user_thresh = div_factor_fine(cache->key.offset,
2751 if (chunk_used < user_thresh)
2754 btrfs_put_block_group(cache);
2758 static int chunk_devid_filter(struct extent_buffer *leaf,
2759 struct btrfs_chunk *chunk,
2760 struct btrfs_balance_args *bargs)
2762 struct btrfs_stripe *stripe;
2763 int num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
2766 for (i = 0; i < num_stripes; i++) {
2767 stripe = btrfs_stripe_nr(chunk, i);
2768 if (btrfs_stripe_devid(leaf, stripe) == bargs->devid)
2775 /* [pstart, pend) */
2776 static int chunk_drange_filter(struct extent_buffer *leaf,
2777 struct btrfs_chunk *chunk,
2779 struct btrfs_balance_args *bargs)
2781 struct btrfs_stripe *stripe;
2782 int num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
2788 if (!(bargs->flags & BTRFS_BALANCE_ARGS_DEVID))
2791 if (btrfs_chunk_type(leaf, chunk) & (BTRFS_BLOCK_GROUP_DUP |
2792 BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10)) {
2793 factor = num_stripes / 2;
2794 } else if (btrfs_chunk_type(leaf, chunk) & BTRFS_BLOCK_GROUP_RAID5) {
2795 factor = num_stripes - 1;
2796 } else if (btrfs_chunk_type(leaf, chunk) & BTRFS_BLOCK_GROUP_RAID6) {
2797 factor = num_stripes - 2;
2799 factor = num_stripes;
2802 for (i = 0; i < num_stripes; i++) {
2803 stripe = btrfs_stripe_nr(chunk, i);
2804 if (btrfs_stripe_devid(leaf, stripe) != bargs->devid)
2807 stripe_offset = btrfs_stripe_offset(leaf, stripe);
2808 stripe_length = btrfs_chunk_length(leaf, chunk);
2809 do_div(stripe_length, factor);
2811 if (stripe_offset < bargs->pend &&
2812 stripe_offset + stripe_length > bargs->pstart)
2819 /* [vstart, vend) */
2820 static int chunk_vrange_filter(struct extent_buffer *leaf,
2821 struct btrfs_chunk *chunk,
2823 struct btrfs_balance_args *bargs)
2825 if (chunk_offset < bargs->vend &&
2826 chunk_offset + btrfs_chunk_length(leaf, chunk) > bargs->vstart)
2827 /* at least part of the chunk is inside this vrange */
2833 static int chunk_soft_convert_filter(u64 chunk_type,
2834 struct btrfs_balance_args *bargs)
2836 if (!(bargs->flags & BTRFS_BALANCE_ARGS_CONVERT))
2839 chunk_type = chunk_to_extended(chunk_type) &
2840 BTRFS_EXTENDED_PROFILE_MASK;
2842 if (bargs->target == chunk_type)
2848 static int should_balance_chunk(struct btrfs_root *root,
2849 struct extent_buffer *leaf,
2850 struct btrfs_chunk *chunk, u64 chunk_offset)
2852 struct btrfs_balance_control *bctl = root->fs_info->balance_ctl;
2853 struct btrfs_balance_args *bargs = NULL;
2854 u64 chunk_type = btrfs_chunk_type(leaf, chunk);
2857 if (!((chunk_type & BTRFS_BLOCK_GROUP_TYPE_MASK) &
2858 (bctl->flags & BTRFS_BALANCE_TYPE_MASK))) {
2862 if (chunk_type & BTRFS_BLOCK_GROUP_DATA)
2863 bargs = &bctl->data;
2864 else if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM)
2866 else if (chunk_type & BTRFS_BLOCK_GROUP_METADATA)
2867 bargs = &bctl->meta;
2869 /* profiles filter */
2870 if ((bargs->flags & BTRFS_BALANCE_ARGS_PROFILES) &&
2871 chunk_profiles_filter(chunk_type, bargs)) {
2876 if ((bargs->flags & BTRFS_BALANCE_ARGS_USAGE) &&
2877 chunk_usage_filter(bctl->fs_info, chunk_offset, bargs)) {
2882 if ((bargs->flags & BTRFS_BALANCE_ARGS_DEVID) &&
2883 chunk_devid_filter(leaf, chunk, bargs)) {
2887 /* drange filter, makes sense only with devid filter */
2888 if ((bargs->flags & BTRFS_BALANCE_ARGS_DRANGE) &&
2889 chunk_drange_filter(leaf, chunk, chunk_offset, bargs)) {
2894 if ((bargs->flags & BTRFS_BALANCE_ARGS_VRANGE) &&
2895 chunk_vrange_filter(leaf, chunk, chunk_offset, bargs)) {
2899 /* soft profile changing mode */
2900 if ((bargs->flags & BTRFS_BALANCE_ARGS_SOFT) &&
2901 chunk_soft_convert_filter(chunk_type, bargs)) {
2908 static int __btrfs_balance(struct btrfs_fs_info *fs_info)
2910 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
2911 struct btrfs_root *chunk_root = fs_info->chunk_root;
2912 struct btrfs_root *dev_root = fs_info->dev_root;
2913 struct list_head *devices;
2914 struct btrfs_device *device;
2917 struct btrfs_chunk *chunk;
2918 struct btrfs_path *path;
2919 struct btrfs_key key;
2920 struct btrfs_key found_key;
2921 struct btrfs_trans_handle *trans;
2922 struct extent_buffer *leaf;
2925 int enospc_errors = 0;
2926 bool counting = true;
2928 /* step one make some room on all the devices */
2929 devices = &fs_info->fs_devices->devices;
2930 list_for_each_entry(device, devices, dev_list) {
2931 old_size = device->total_bytes;
2932 size_to_free = div_factor(old_size, 1);
2933 size_to_free = min(size_to_free, (u64)1 * 1024 * 1024);
2934 if (!device->writeable ||
2935 device->total_bytes - device->bytes_used > size_to_free ||
2936 device->is_tgtdev_for_dev_replace)
2939 ret = btrfs_shrink_device(device, old_size - size_to_free);
2944 trans = btrfs_start_transaction(dev_root, 0);
2945 BUG_ON(IS_ERR(trans));
2947 ret = btrfs_grow_device(trans, device, old_size);
2950 btrfs_end_transaction(trans, dev_root);
2953 /* step two, relocate all the chunks */
2954 path = btrfs_alloc_path();
2960 /* zero out stat counters */
2961 spin_lock(&fs_info->balance_lock);
2962 memset(&bctl->stat, 0, sizeof(bctl->stat));
2963 spin_unlock(&fs_info->balance_lock);
2965 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
2966 key.offset = (u64)-1;
2967 key.type = BTRFS_CHUNK_ITEM_KEY;
2970 if ((!counting && atomic_read(&fs_info->balance_pause_req)) ||
2971 atomic_read(&fs_info->balance_cancel_req)) {
2976 ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0);
2981 * this shouldn't happen, it means the last relocate
2985 BUG(); /* FIXME break ? */
2987 ret = btrfs_previous_item(chunk_root, path, 0,
2988 BTRFS_CHUNK_ITEM_KEY);
2994 leaf = path->nodes[0];
2995 slot = path->slots[0];
2996 btrfs_item_key_to_cpu(leaf, &found_key, slot);
2998 if (found_key.objectid != key.objectid)
3001 chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
3004 spin_lock(&fs_info->balance_lock);
3005 bctl->stat.considered++;
3006 spin_unlock(&fs_info->balance_lock);
3009 ret = should_balance_chunk(chunk_root, leaf, chunk,
3011 btrfs_release_path(path);
3016 spin_lock(&fs_info->balance_lock);
3017 bctl->stat.expected++;
3018 spin_unlock(&fs_info->balance_lock);
3022 ret = btrfs_relocate_chunk(chunk_root,
3023 chunk_root->root_key.objectid,
3026 if (ret && ret != -ENOSPC)
3028 if (ret == -ENOSPC) {
3031 spin_lock(&fs_info->balance_lock);
3032 bctl->stat.completed++;
3033 spin_unlock(&fs_info->balance_lock);
3036 if (found_key.offset == 0)
3038 key.offset = found_key.offset - 1;
3042 btrfs_release_path(path);
3047 btrfs_free_path(path);
3048 if (enospc_errors) {
3049 printk(KERN_INFO "btrfs: %d enospc errors during balance\n",
3059 * alloc_profile_is_valid - see if a given profile is valid and reduced
3060 * @flags: profile to validate
3061 * @extended: if true @flags is treated as an extended profile
3063 static int alloc_profile_is_valid(u64 flags, int extended)
3065 u64 mask = (extended ? BTRFS_EXTENDED_PROFILE_MASK :
3066 BTRFS_BLOCK_GROUP_PROFILE_MASK);
3068 flags &= ~BTRFS_BLOCK_GROUP_TYPE_MASK;
3070 /* 1) check that all other bits are zeroed */
3074 /* 2) see if profile is reduced */
3076 return !extended; /* "0" is valid for usual profiles */
3078 /* true if exactly one bit set */
3079 return (flags & (flags - 1)) == 0;
3082 static inline int balance_need_close(struct btrfs_fs_info *fs_info)
3084 /* cancel requested || normal exit path */
3085 return atomic_read(&fs_info->balance_cancel_req) ||
3086 (atomic_read(&fs_info->balance_pause_req) == 0 &&
3087 atomic_read(&fs_info->balance_cancel_req) == 0);
3090 static void __cancel_balance(struct btrfs_fs_info *fs_info)
3094 unset_balance_control(fs_info);
3095 ret = del_balance_item(fs_info->tree_root);
3097 btrfs_std_error(fs_info, ret);
3099 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
3103 * Should be called with both balance and volume mutexes held
3105 int btrfs_balance(struct btrfs_balance_control *bctl,
3106 struct btrfs_ioctl_balance_args *bargs)
3108 struct btrfs_fs_info *fs_info = bctl->fs_info;
3115 if (btrfs_fs_closing(fs_info) ||
3116 atomic_read(&fs_info->balance_pause_req) ||
3117 atomic_read(&fs_info->balance_cancel_req)) {
3122 allowed = btrfs_super_incompat_flags(fs_info->super_copy);
3123 if (allowed & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
3127 * In case of mixed groups both data and meta should be picked,
3128 * and identical options should be given for both of them.
3130 allowed = BTRFS_BALANCE_DATA | BTRFS_BALANCE_METADATA;
3131 if (mixed && (bctl->flags & allowed)) {
3132 if (!(bctl->flags & BTRFS_BALANCE_DATA) ||
3133 !(bctl->flags & BTRFS_BALANCE_METADATA) ||
3134 memcmp(&bctl->data, &bctl->meta, sizeof(bctl->data))) {
3135 printk(KERN_ERR "btrfs: with mixed groups data and "
3136 "metadata balance options must be the same\n");
3142 num_devices = fs_info->fs_devices->num_devices;
3143 btrfs_dev_replace_lock(&fs_info->dev_replace);
3144 if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) {
3145 BUG_ON(num_devices < 1);
3148 btrfs_dev_replace_unlock(&fs_info->dev_replace);
3149 allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE;
3150 if (num_devices == 1)
3151 allowed |= BTRFS_BLOCK_GROUP_DUP;
3152 else if (num_devices > 1)
3153 allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1);
3154 if (num_devices > 2)
3155 allowed |= BTRFS_BLOCK_GROUP_RAID5;
3156 if (num_devices > 3)
3157 allowed |= (BTRFS_BLOCK_GROUP_RAID10 |
3158 BTRFS_BLOCK_GROUP_RAID6);
3159 if ((bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
3160 (!alloc_profile_is_valid(bctl->data.target, 1) ||
3161 (bctl->data.target & ~allowed))) {
3162 printk(KERN_ERR "btrfs: unable to start balance with target "
3163 "data profile %llu\n",
3168 if ((bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
3169 (!alloc_profile_is_valid(bctl->meta.target, 1) ||
3170 (bctl->meta.target & ~allowed))) {
3171 printk(KERN_ERR "btrfs: unable to start balance with target "
3172 "metadata profile %llu\n",
3177 if ((bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
3178 (!alloc_profile_is_valid(bctl->sys.target, 1) ||
3179 (bctl->sys.target & ~allowed))) {
3180 printk(KERN_ERR "btrfs: unable to start balance with target "
3181 "system profile %llu\n",
3187 /* allow dup'ed data chunks only in mixed mode */
3188 if (!mixed && (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
3189 (bctl->data.target & BTRFS_BLOCK_GROUP_DUP)) {
3190 printk(KERN_ERR "btrfs: dup for data is not allowed\n");
3195 /* allow to reduce meta or sys integrity only if force set */
3196 allowed = BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 |
3197 BTRFS_BLOCK_GROUP_RAID10 |
3198 BTRFS_BLOCK_GROUP_RAID5 |
3199 BTRFS_BLOCK_GROUP_RAID6;
3201 seq = read_seqbegin(&fs_info->profiles_lock);
3203 if (((bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
3204 (fs_info->avail_system_alloc_bits & allowed) &&
3205 !(bctl->sys.target & allowed)) ||
3206 ((bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
3207 (fs_info->avail_metadata_alloc_bits & allowed) &&
3208 !(bctl->meta.target & allowed))) {
3209 if (bctl->flags & BTRFS_BALANCE_FORCE) {
3210 printk(KERN_INFO "btrfs: force reducing metadata "
3213 printk(KERN_ERR "btrfs: balance will reduce metadata "
3214 "integrity, use force if you want this\n");
3219 } while (read_seqretry(&fs_info->profiles_lock, seq));
3221 if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) {
3222 int num_tolerated_disk_barrier_failures;
3223 u64 target = bctl->sys.target;
3225 num_tolerated_disk_barrier_failures =
3226 btrfs_calc_num_tolerated_disk_barrier_failures(fs_info);
3227 if (num_tolerated_disk_barrier_failures > 0 &&
3229 (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 |
3230 BTRFS_AVAIL_ALLOC_BIT_SINGLE)))
3231 num_tolerated_disk_barrier_failures = 0;
3232 else if (num_tolerated_disk_barrier_failures > 1 &&
3234 (BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10)))
3235 num_tolerated_disk_barrier_failures = 1;
3237 fs_info->num_tolerated_disk_barrier_failures =
3238 num_tolerated_disk_barrier_failures;
3241 ret = insert_balance_item(fs_info->tree_root, bctl);
3242 if (ret && ret != -EEXIST)
3245 if (!(bctl->flags & BTRFS_BALANCE_RESUME)) {
3246 BUG_ON(ret == -EEXIST);
3247 set_balance_control(bctl);
3249 BUG_ON(ret != -EEXIST);
3250 spin_lock(&fs_info->balance_lock);
3251 update_balance_args(bctl);
3252 spin_unlock(&fs_info->balance_lock);
3255 atomic_inc(&fs_info->balance_running);
3256 mutex_unlock(&fs_info->balance_mutex);
3258 ret = __btrfs_balance(fs_info);
3260 mutex_lock(&fs_info->balance_mutex);
3261 atomic_dec(&fs_info->balance_running);
3263 if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) {
3264 fs_info->num_tolerated_disk_barrier_failures =
3265 btrfs_calc_num_tolerated_disk_barrier_failures(fs_info);
3269 memset(bargs, 0, sizeof(*bargs));
3270 update_ioctl_balance_args(fs_info, 0, bargs);
3273 if ((ret && ret != -ECANCELED && ret != -ENOSPC) ||
3274 balance_need_close(fs_info)) {
3275 __cancel_balance(fs_info);
3278 wake_up(&fs_info->balance_wait_q);
3282 if (bctl->flags & BTRFS_BALANCE_RESUME)
3283 __cancel_balance(fs_info);
3286 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
3291 static int balance_kthread(void *data)
3293 struct btrfs_fs_info *fs_info = data;
3296 mutex_lock(&fs_info->volume_mutex);
3297 mutex_lock(&fs_info->balance_mutex);
3299 if (fs_info->balance_ctl) {
3300 printk(KERN_INFO "btrfs: continuing balance\n");
3301 ret = btrfs_balance(fs_info->balance_ctl, NULL);
3304 mutex_unlock(&fs_info->balance_mutex);
3305 mutex_unlock(&fs_info->volume_mutex);
3310 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info)
3312 struct task_struct *tsk;
3314 spin_lock(&fs_info->balance_lock);
3315 if (!fs_info->balance_ctl) {
3316 spin_unlock(&fs_info->balance_lock);
3319 spin_unlock(&fs_info->balance_lock);
3321 if (btrfs_test_opt(fs_info->tree_root, SKIP_BALANCE)) {
3322 printk(KERN_INFO "btrfs: force skipping balance\n");
3326 tsk = kthread_run(balance_kthread, fs_info, "btrfs-balance");
3327 return PTR_ERR_OR_ZERO(tsk);
3330 int btrfs_recover_balance(struct btrfs_fs_info *fs_info)
3332 struct btrfs_balance_control *bctl;
3333 struct btrfs_balance_item *item;
3334 struct btrfs_disk_balance_args disk_bargs;
3335 struct btrfs_path *path;
3336 struct extent_buffer *leaf;
3337 struct btrfs_key key;
3340 path = btrfs_alloc_path();
3344 key.objectid = BTRFS_BALANCE_OBJECTID;
3345 key.type = BTRFS_BALANCE_ITEM_KEY;
3348 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
3351 if (ret > 0) { /* ret = -ENOENT; */
3356 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
3362 leaf = path->nodes[0];
3363 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item);
3365 bctl->fs_info = fs_info;
3366 bctl->flags = btrfs_balance_flags(leaf, item);
3367 bctl->flags |= BTRFS_BALANCE_RESUME;
3369 btrfs_balance_data(leaf, item, &disk_bargs);
3370 btrfs_disk_balance_args_to_cpu(&bctl->data, &disk_bargs);
3371 btrfs_balance_meta(leaf, item, &disk_bargs);
3372 btrfs_disk_balance_args_to_cpu(&bctl->meta, &disk_bargs);
3373 btrfs_balance_sys(leaf, item, &disk_bargs);
3374 btrfs_disk_balance_args_to_cpu(&bctl->sys, &disk_bargs);
3376 WARN_ON(atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1));
3378 mutex_lock(&fs_info->volume_mutex);
3379 mutex_lock(&fs_info->balance_mutex);
3381 set_balance_control(bctl);
3383 mutex_unlock(&fs_info->balance_mutex);
3384 mutex_unlock(&fs_info->volume_mutex);
3386 btrfs_free_path(path);
3390 int btrfs_pause_balance(struct btrfs_fs_info *fs_info)
3394 mutex_lock(&fs_info->balance_mutex);
3395 if (!fs_info->balance_ctl) {
3396 mutex_unlock(&fs_info->balance_mutex);
3400 if (atomic_read(&fs_info->balance_running)) {
3401 atomic_inc(&fs_info->balance_pause_req);
3402 mutex_unlock(&fs_info->balance_mutex);
3404 wait_event(fs_info->balance_wait_q,
3405 atomic_read(&fs_info->balance_running) == 0);
3407 mutex_lock(&fs_info->balance_mutex);
3408 /* we are good with balance_ctl ripped off from under us */
3409 BUG_ON(atomic_read(&fs_info->balance_running));
3410 atomic_dec(&fs_info->balance_pause_req);
3415 mutex_unlock(&fs_info->balance_mutex);
3419 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info)
3421 mutex_lock(&fs_info->balance_mutex);
3422 if (!fs_info->balance_ctl) {
3423 mutex_unlock(&fs_info->balance_mutex);
3427 atomic_inc(&fs_info->balance_cancel_req);
3429 * if we are running just wait and return, balance item is
3430 * deleted in btrfs_balance in this case
3432 if (atomic_read(&fs_info->balance_running)) {
3433 mutex_unlock(&fs_info->balance_mutex);
3434 wait_event(fs_info->balance_wait_q,
3435 atomic_read(&fs_info->balance_running) == 0);
3436 mutex_lock(&fs_info->balance_mutex);
3438 /* __cancel_balance needs volume_mutex */
3439 mutex_unlock(&fs_info->balance_mutex);
3440 mutex_lock(&fs_info->volume_mutex);
3441 mutex_lock(&fs_info->balance_mutex);
3443 if (fs_info->balance_ctl)
3444 __cancel_balance(fs_info);
3446 mutex_unlock(&fs_info->volume_mutex);
3449 BUG_ON(fs_info->balance_ctl || atomic_read(&fs_info->balance_running));
3450 atomic_dec(&fs_info->balance_cancel_req);
3451 mutex_unlock(&fs_info->balance_mutex);
3455 static int btrfs_uuid_scan_kthread(void *data)
3457 struct btrfs_fs_info *fs_info = data;
3458 struct btrfs_root *root = fs_info->tree_root;
3459 struct btrfs_key key;
3460 struct btrfs_key max_key;
3461 struct btrfs_path *path = NULL;
3463 struct extent_buffer *eb;
3465 struct btrfs_root_item root_item;
3467 struct btrfs_trans_handle *trans = NULL;
3469 path = btrfs_alloc_path();
3476 key.type = BTRFS_ROOT_ITEM_KEY;
3479 max_key.objectid = (u64)-1;
3480 max_key.type = BTRFS_ROOT_ITEM_KEY;
3481 max_key.offset = (u64)-1;
3483 path->keep_locks = 1;
3486 ret = btrfs_search_forward(root, &key, &max_key, path, 0);
3493 if (key.type != BTRFS_ROOT_ITEM_KEY ||
3494 (key.objectid < BTRFS_FIRST_FREE_OBJECTID &&
3495 key.objectid != BTRFS_FS_TREE_OBJECTID) ||
3496 key.objectid > BTRFS_LAST_FREE_OBJECTID)
3499 eb = path->nodes[0];
3500 slot = path->slots[0];
3501 item_size = btrfs_item_size_nr(eb, slot);
3502 if (item_size < sizeof(root_item))
3505 read_extent_buffer(eb, &root_item,
3506 btrfs_item_ptr_offset(eb, slot),
3507 (int)sizeof(root_item));
3508 if (btrfs_root_refs(&root_item) == 0)
3511 if (!btrfs_is_empty_uuid(root_item.uuid) ||
3512 !btrfs_is_empty_uuid(root_item.received_uuid)) {
3516 btrfs_release_path(path);
3518 * 1 - subvol uuid item
3519 * 1 - received_subvol uuid item
3521 trans = btrfs_start_transaction(fs_info->uuid_root, 2);
3522 if (IS_ERR(trans)) {
3523 ret = PTR_ERR(trans);
3531 if (!btrfs_is_empty_uuid(root_item.uuid)) {
3532 ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root,
3534 BTRFS_UUID_KEY_SUBVOL,
3537 pr_warn("btrfs: uuid_tree_add failed %d\n",
3543 if (!btrfs_is_empty_uuid(root_item.received_uuid)) {
3544 ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root,
3545 root_item.received_uuid,
3546 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
3549 pr_warn("btrfs: uuid_tree_add failed %d\n",
3557 ret = btrfs_end_transaction(trans, fs_info->uuid_root);
3563 btrfs_release_path(path);
3564 if (key.offset < (u64)-1) {
3566 } else if (key.type < BTRFS_ROOT_ITEM_KEY) {
3568 key.type = BTRFS_ROOT_ITEM_KEY;
3569 } else if (key.objectid < (u64)-1) {
3571 key.type = BTRFS_ROOT_ITEM_KEY;
3580 btrfs_free_path(path);
3581 if (trans && !IS_ERR(trans))
3582 btrfs_end_transaction(trans, fs_info->uuid_root);
3584 pr_warn("btrfs: btrfs_uuid_scan_kthread failed %d\n", ret);
3586 fs_info->update_uuid_tree_gen = 1;
3587 up(&fs_info->uuid_tree_rescan_sem);
3592 * Callback for btrfs_uuid_tree_iterate().
3594 * 0 check succeeded, the entry is not outdated.
3595 * < 0 if an error occured.
3596 * > 0 if the check failed, which means the caller shall remove the entry.
3598 static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info *fs_info,
3599 u8 *uuid, u8 type, u64 subid)
3601 struct btrfs_key key;
3603 struct btrfs_root *subvol_root;
3605 if (type != BTRFS_UUID_KEY_SUBVOL &&
3606 type != BTRFS_UUID_KEY_RECEIVED_SUBVOL)
3609 key.objectid = subid;
3610 key.type = BTRFS_ROOT_ITEM_KEY;
3611 key.offset = (u64)-1;
3612 subvol_root = btrfs_read_fs_root_no_name(fs_info, &key);
3613 if (IS_ERR(subvol_root)) {
3614 ret = PTR_ERR(subvol_root);
3621 case BTRFS_UUID_KEY_SUBVOL:
3622 if (memcmp(uuid, subvol_root->root_item.uuid, BTRFS_UUID_SIZE))
3625 case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
3626 if (memcmp(uuid, subvol_root->root_item.received_uuid,
3636 static int btrfs_uuid_rescan_kthread(void *data)
3638 struct btrfs_fs_info *fs_info = (struct btrfs_fs_info *)data;
3642 * 1st step is to iterate through the existing UUID tree and
3643 * to delete all entries that contain outdated data.
3644 * 2nd step is to add all missing entries to the UUID tree.
3646 ret = btrfs_uuid_tree_iterate(fs_info, btrfs_check_uuid_tree_entry);
3648 pr_warn("btrfs: iterating uuid_tree failed %d\n", ret);
3649 up(&fs_info->uuid_tree_rescan_sem);
3652 return btrfs_uuid_scan_kthread(data);
3655 int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info)
3657 struct btrfs_trans_handle *trans;
3658 struct btrfs_root *tree_root = fs_info->tree_root;
3659 struct btrfs_root *uuid_root;
3660 struct task_struct *task;
3667 trans = btrfs_start_transaction(tree_root, 2);
3669 return PTR_ERR(trans);
3671 uuid_root = btrfs_create_tree(trans, fs_info,
3672 BTRFS_UUID_TREE_OBJECTID);
3673 if (IS_ERR(uuid_root)) {
3674 btrfs_abort_transaction(trans, tree_root,
3675 PTR_ERR(uuid_root));
3676 return PTR_ERR(uuid_root);
3679 fs_info->uuid_root = uuid_root;
3681 ret = btrfs_commit_transaction(trans, tree_root);
3685 down(&fs_info->uuid_tree_rescan_sem);
3686 task = kthread_run(btrfs_uuid_scan_kthread, fs_info, "btrfs-uuid");
3688 /* fs_info->update_uuid_tree_gen remains 0 in all error case */
3689 pr_warn("btrfs: failed to start uuid_scan task\n");
3690 up(&fs_info->uuid_tree_rescan_sem);
3691 return PTR_ERR(task);
3697 int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info)
3699 struct task_struct *task;
3701 down(&fs_info->uuid_tree_rescan_sem);
3702 task = kthread_run(btrfs_uuid_rescan_kthread, fs_info, "btrfs-uuid");
3704 /* fs_info->update_uuid_tree_gen remains 0 in all error case */
3705 pr_warn("btrfs: failed to start uuid_rescan task\n");
3706 up(&fs_info->uuid_tree_rescan_sem);
3707 return PTR_ERR(task);
3714 * shrinking a device means finding all of the device extents past
3715 * the new size, and then following the back refs to the chunks.
3716 * The chunk relocation code actually frees the device extent
3718 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
3720 struct btrfs_trans_handle *trans;
3721 struct btrfs_root *root = device->dev_root;
3722 struct btrfs_dev_extent *dev_extent = NULL;
3723 struct btrfs_path *path;
3731 bool retried = false;
3732 struct extent_buffer *l;
3733 struct btrfs_key key;
3734 struct btrfs_super_block *super_copy = root->fs_info->super_copy;
3735 u64 old_total = btrfs_super_total_bytes(super_copy);
3736 u64 old_size = device->total_bytes;
3737 u64 diff = device->total_bytes - new_size;
3739 if (device->is_tgtdev_for_dev_replace)
3742 path = btrfs_alloc_path();
3750 device->total_bytes = new_size;
3751 if (device->writeable) {
3752 device->fs_devices->total_rw_bytes -= diff;
3753 spin_lock(&root->fs_info->free_chunk_lock);
3754 root->fs_info->free_chunk_space -= diff;
3755 spin_unlock(&root->fs_info->free_chunk_lock);
3757 unlock_chunks(root);
3760 key.objectid = device->devid;
3761 key.offset = (u64)-1;
3762 key.type = BTRFS_DEV_EXTENT_KEY;
3765 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3769 ret = btrfs_previous_item(root, path, 0, key.type);
3774 btrfs_release_path(path);
3779 slot = path->slots[0];
3780 btrfs_item_key_to_cpu(l, &key, path->slots[0]);
3782 if (key.objectid != device->devid) {
3783 btrfs_release_path(path);
3787 dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
3788 length = btrfs_dev_extent_length(l, dev_extent);
3790 if (key.offset + length <= new_size) {
3791 btrfs_release_path(path);
3795 chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent);
3796 chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent);
3797 chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent);
3798 btrfs_release_path(path);
3800 ret = btrfs_relocate_chunk(root, chunk_tree, chunk_objectid,
3802 if (ret && ret != -ENOSPC)
3806 } while (key.offset-- > 0);
3808 if (failed && !retried) {
3812 } else if (failed && retried) {
3816 device->total_bytes = old_size;
3817 if (device->writeable)
3818 device->fs_devices->total_rw_bytes += diff;
3819 spin_lock(&root->fs_info->free_chunk_lock);
3820 root->fs_info->free_chunk_space += diff;
3821 spin_unlock(&root->fs_info->free_chunk_lock);
3822 unlock_chunks(root);
3826 /* Shrinking succeeded, else we would be at "done". */
3827 trans = btrfs_start_transaction(root, 0);
3828 if (IS_ERR(trans)) {
3829 ret = PTR_ERR(trans);
3835 device->disk_total_bytes = new_size;
3836 /* Now btrfs_update_device() will change the on-disk size. */
3837 ret = btrfs_update_device(trans, device);
3839 unlock_chunks(root);
3840 btrfs_end_transaction(trans, root);
3843 WARN_ON(diff > old_total);
3844 btrfs_set_super_total_bytes(super_copy, old_total - diff);
3845 unlock_chunks(root);
3846 btrfs_end_transaction(trans, root);
3848 btrfs_free_path(path);
3852 static int btrfs_add_system_chunk(struct btrfs_root *root,
3853 struct btrfs_key *key,
3854 struct btrfs_chunk *chunk, int item_size)
3856 struct btrfs_super_block *super_copy = root->fs_info->super_copy;
3857 struct btrfs_disk_key disk_key;
3861 array_size = btrfs_super_sys_array_size(super_copy);
3862 if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE)
3865 ptr = super_copy->sys_chunk_array + array_size;
3866 btrfs_cpu_key_to_disk(&disk_key, key);
3867 memcpy(ptr, &disk_key, sizeof(disk_key));
3868 ptr += sizeof(disk_key);
3869 memcpy(ptr, chunk, item_size);
3870 item_size += sizeof(disk_key);
3871 btrfs_set_super_sys_array_size(super_copy, array_size + item_size);
3876 * sort the devices in descending order by max_avail, total_avail
3878 static int btrfs_cmp_device_info(const void *a, const void *b)
3880 const struct btrfs_device_info *di_a = a;
3881 const struct btrfs_device_info *di_b = b;
3883 if (di_a->max_avail > di_b->max_avail)
3885 if (di_a->max_avail < di_b->max_avail)
3887 if (di_a->total_avail > di_b->total_avail)
3889 if (di_a->total_avail < di_b->total_avail)
3894 static struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
3895 [BTRFS_RAID_RAID10] = {
3898 .devs_max = 0, /* 0 == as many as possible */
3900 .devs_increment = 2,
3903 [BTRFS_RAID_RAID1] = {
3908 .devs_increment = 2,
3911 [BTRFS_RAID_DUP] = {
3916 .devs_increment = 1,
3919 [BTRFS_RAID_RAID0] = {
3924 .devs_increment = 1,
3927 [BTRFS_RAID_SINGLE] = {
3932 .devs_increment = 1,
3935 [BTRFS_RAID_RAID5] = {
3940 .devs_increment = 1,
3943 [BTRFS_RAID_RAID6] = {
3948 .devs_increment = 1,
3953 static u32 find_raid56_stripe_len(u32 data_devices, u32 dev_stripe_target)
3955 /* TODO allow them to set a preferred stripe size */
3959 static void check_raid56_incompat_flag(struct btrfs_fs_info *info, u64 type)
3961 if (!(type & (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)))
3964 btrfs_set_fs_incompat(info, RAID56);
3967 static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
3968 struct btrfs_root *extent_root, u64 start,
3971 struct btrfs_fs_info *info = extent_root->fs_info;
3972 struct btrfs_fs_devices *fs_devices = info->fs_devices;
3973 struct list_head *cur;
3974 struct map_lookup *map = NULL;
3975 struct extent_map_tree *em_tree;
3976 struct extent_map *em;
3977 struct btrfs_device_info *devices_info = NULL;
3979 int num_stripes; /* total number of stripes to allocate */
3980 int data_stripes; /* number of stripes that count for
3982 int sub_stripes; /* sub_stripes info for map */
3983 int dev_stripes; /* stripes per dev */
3984 int devs_max; /* max devs to use */
3985 int devs_min; /* min devs needed */
3986 int devs_increment; /* ndevs has to be a multiple of this */
3987 int ncopies; /* how many copies to data has */
3989 u64 max_stripe_size;
3993 u64 raid_stripe_len = BTRFS_STRIPE_LEN;
3999 BUG_ON(!alloc_profile_is_valid(type, 0));
4001 if (list_empty(&fs_devices->alloc_list))
4004 index = __get_raid_index(type);
4006 sub_stripes = btrfs_raid_array[index].sub_stripes;
4007 dev_stripes = btrfs_raid_array[index].dev_stripes;
4008 devs_max = btrfs_raid_array[index].devs_max;
4009 devs_min = btrfs_raid_array[index].devs_min;
4010 devs_increment = btrfs_raid_array[index].devs_increment;
4011 ncopies = btrfs_raid_array[index].ncopies;
4013 if (type & BTRFS_BLOCK_GROUP_DATA) {
4014 max_stripe_size = 1024 * 1024 * 1024;
4015 max_chunk_size = 10 * max_stripe_size;
4016 } else if (type & BTRFS_BLOCK_GROUP_METADATA) {
4017 /* for larger filesystems, use larger metadata chunks */
4018 if (fs_devices->total_rw_bytes > 50ULL * 1024 * 1024 * 1024)
4019 max_stripe_size = 1024 * 1024 * 1024;
4021 max_stripe_size = 256 * 1024 * 1024;
4022 max_chunk_size = max_stripe_size;
4023 } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
4024 max_stripe_size = 32 * 1024 * 1024;
4025 max_chunk_size = 2 * max_stripe_size;
4027 printk(KERN_ERR "btrfs: invalid chunk type 0x%llx requested\n",
4032 /* we don't want a chunk larger than 10% of writeable space */
4033 max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1),
4036 devices_info = kzalloc(sizeof(*devices_info) * fs_devices->rw_devices,
4041 cur = fs_devices->alloc_list.next;
4044 * in the first pass through the devices list, we gather information
4045 * about the available holes on each device.
4048 while (cur != &fs_devices->alloc_list) {
4049 struct btrfs_device *device;
4053 device = list_entry(cur, struct btrfs_device, dev_alloc_list);
4057 if (!device->writeable) {
4059 "btrfs: read-only device in alloc_list\n");
4063 if (!device->in_fs_metadata ||
4064 device->is_tgtdev_for_dev_replace)
4067 if (device->total_bytes > device->bytes_used)
4068 total_avail = device->total_bytes - device->bytes_used;
4072 /* If there is no space on this device, skip it. */
4073 if (total_avail == 0)
4076 ret = find_free_dev_extent(trans, device,
4077 max_stripe_size * dev_stripes,
4078 &dev_offset, &max_avail);
4079 if (ret && ret != -ENOSPC)
4083 max_avail = max_stripe_size * dev_stripes;
4085 if (max_avail < BTRFS_STRIPE_LEN * dev_stripes)
4088 if (ndevs == fs_devices->rw_devices) {
4089 WARN(1, "%s: found more than %llu devices\n",
4090 __func__, fs_devices->rw_devices);
4093 devices_info[ndevs].dev_offset = dev_offset;
4094 devices_info[ndevs].max_avail = max_avail;
4095 devices_info[ndevs].total_avail = total_avail;
4096 devices_info[ndevs].dev = device;
4101 * now sort the devices by hole size / available space
4103 sort(devices_info, ndevs, sizeof(struct btrfs_device_info),
4104 btrfs_cmp_device_info, NULL);
4106 /* round down to number of usable stripes */
4107 ndevs -= ndevs % devs_increment;
4109 if (ndevs < devs_increment * sub_stripes || ndevs < devs_min) {
4114 if (devs_max && ndevs > devs_max)
4117 * the primary goal is to maximize the number of stripes, so use as many
4118 * devices as possible, even if the stripes are not maximum sized.
4120 stripe_size = devices_info[ndevs-1].max_avail;
4121 num_stripes = ndevs * dev_stripes;
4124 * this will have to be fixed for RAID1 and RAID10 over
4127 data_stripes = num_stripes / ncopies;
4129 if (type & BTRFS_BLOCK_GROUP_RAID5) {
4130 raid_stripe_len = find_raid56_stripe_len(ndevs - 1,
4131 btrfs_super_stripesize(info->super_copy));
4132 data_stripes = num_stripes - 1;
4134 if (type & BTRFS_BLOCK_GROUP_RAID6) {
4135 raid_stripe_len = find_raid56_stripe_len(ndevs - 2,
4136 btrfs_super_stripesize(info->super_copy));
4137 data_stripes = num_stripes - 2;
4141 * Use the number of data stripes to figure out how big this chunk
4142 * is really going to be in terms of logical address space,
4143 * and compare that answer with the max chunk size
4145 if (stripe_size * data_stripes > max_chunk_size) {
4146 u64 mask = (1ULL << 24) - 1;
4147 stripe_size = max_chunk_size;
4148 do_div(stripe_size, data_stripes);
4150 /* bump the answer up to a 16MB boundary */
4151 stripe_size = (stripe_size + mask) & ~mask;
4153 /* but don't go higher than the limits we found
4154 * while searching for free extents
4156 if (stripe_size > devices_info[ndevs-1].max_avail)
4157 stripe_size = devices_info[ndevs-1].max_avail;
4160 do_div(stripe_size, dev_stripes);
4162 /* align to BTRFS_STRIPE_LEN */
4163 do_div(stripe_size, raid_stripe_len);
4164 stripe_size *= raid_stripe_len;
4166 map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
4171 map->num_stripes = num_stripes;
4173 for (i = 0; i < ndevs; ++i) {
4174 for (j = 0; j < dev_stripes; ++j) {
4175 int s = i * dev_stripes + j;
4176 map->stripes[s].dev = devices_info[i].dev;
4177 map->stripes[s].physical = devices_info[i].dev_offset +
4181 map->sector_size = extent_root->sectorsize;
4182 map->stripe_len = raid_stripe_len;
4183 map->io_align = raid_stripe_len;
4184 map->io_width = raid_stripe_len;
4186 map->sub_stripes = sub_stripes;
4188 num_bytes = stripe_size * data_stripes;
4190 trace_btrfs_chunk_alloc(info->chunk_root, map, start, num_bytes);
4192 em = alloc_extent_map();
4197 em->bdev = (struct block_device *)map;
4199 em->len = num_bytes;
4200 em->block_start = 0;
4201 em->block_len = em->len;
4202 em->orig_block_len = stripe_size;
4204 em_tree = &extent_root->fs_info->mapping_tree.map_tree;
4205 write_lock(&em_tree->lock);
4206 ret = add_extent_mapping(em_tree, em, 0);
4208 list_add_tail(&em->list, &trans->transaction->pending_chunks);
4209 atomic_inc(&em->refs);
4211 write_unlock(&em_tree->lock);
4213 free_extent_map(em);
4217 ret = btrfs_make_block_group(trans, extent_root, 0, type,
4218 BTRFS_FIRST_CHUNK_TREE_OBJECTID,
4221 goto error_del_extent;
4223 free_extent_map(em);
4224 check_raid56_incompat_flag(extent_root->fs_info, type);
4226 kfree(devices_info);
4230 write_lock(&em_tree->lock);
4231 remove_extent_mapping(em_tree, em);
4232 write_unlock(&em_tree->lock);
4234 /* One for our allocation */
4235 free_extent_map(em);
4236 /* One for the tree reference */
4237 free_extent_map(em);
4240 kfree(devices_info);
4244 int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
4245 struct btrfs_root *extent_root,
4246 u64 chunk_offset, u64 chunk_size)
4248 struct btrfs_key key;
4249 struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root;
4250 struct btrfs_device *device;
4251 struct btrfs_chunk *chunk;
4252 struct btrfs_stripe *stripe;
4253 struct extent_map_tree *em_tree;
4254 struct extent_map *em;
4255 struct map_lookup *map;
4262 em_tree = &extent_root->fs_info->mapping_tree.map_tree;
4263 read_lock(&em_tree->lock);
4264 em = lookup_extent_mapping(em_tree, chunk_offset, chunk_size);
4265 read_unlock(&em_tree->lock);
4268 btrfs_crit(extent_root->fs_info, "unable to find logical "
4269 "%Lu len %Lu", chunk_offset, chunk_size);
4273 if (em->start != chunk_offset || em->len != chunk_size) {
4274 btrfs_crit(extent_root->fs_info, "found a bad mapping, wanted"
4275 " %Lu-%Lu, found %Lu-%Lu\n", chunk_offset,
4276 chunk_size, em->start, em->len);
4277 free_extent_map(em);
4281 map = (struct map_lookup *)em->bdev;
4282 item_size = btrfs_chunk_item_size(map->num_stripes);
4283 stripe_size = em->orig_block_len;
4285 chunk = kzalloc(item_size, GFP_NOFS);
4291 for (i = 0; i < map->num_stripes; i++) {
4292 device = map->stripes[i].dev;
4293 dev_offset = map->stripes[i].physical;
4295 device->bytes_used += stripe_size;
4296 ret = btrfs_update_device(trans, device);
4299 ret = btrfs_alloc_dev_extent(trans, device,
4300 chunk_root->root_key.objectid,
4301 BTRFS_FIRST_CHUNK_TREE_OBJECTID,
4302 chunk_offset, dev_offset,
4308 spin_lock(&extent_root->fs_info->free_chunk_lock);
4309 extent_root->fs_info->free_chunk_space -= (stripe_size *
4311 spin_unlock(&extent_root->fs_info->free_chunk_lock);
4313 stripe = &chunk->stripe;
4314 for (i = 0; i < map->num_stripes; i++) {
4315 device = map->stripes[i].dev;
4316 dev_offset = map->stripes[i].physical;
4318 btrfs_set_stack_stripe_devid(stripe, device->devid);
4319 btrfs_set_stack_stripe_offset(stripe, dev_offset);
4320 memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE);
4324 btrfs_set_stack_chunk_length(chunk, chunk_size);
4325 btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid);
4326 btrfs_set_stack_chunk_stripe_len(chunk, map->stripe_len);
4327 btrfs_set_stack_chunk_type(chunk, map->type);
4328 btrfs_set_stack_chunk_num_stripes(chunk, map->num_stripes);
4329 btrfs_set_stack_chunk_io_align(chunk, map->stripe_len);
4330 btrfs_set_stack_chunk_io_width(chunk, map->stripe_len);
4331 btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize);
4332 btrfs_set_stack_chunk_sub_stripes(chunk, map->sub_stripes);
4334 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
4335 key.type = BTRFS_CHUNK_ITEM_KEY;
4336 key.offset = chunk_offset;
4338 ret = btrfs_insert_item(trans, chunk_root, &key, chunk, item_size);
4339 if (ret == 0 && map->type & BTRFS_BLOCK_GROUP_SYSTEM) {
4341 * TODO: Cleanup of inserted chunk root in case of
4344 ret = btrfs_add_system_chunk(chunk_root, &key, chunk,
4350 free_extent_map(em);
4355 * Chunk allocation falls into two parts. The first part does works
4356 * that make the new allocated chunk useable, but not do any operation
4357 * that modifies the chunk tree. The second part does the works that
4358 * require modifying the chunk tree. This division is important for the
4359 * bootstrap process of adding storage to a seed btrfs.
4361 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
4362 struct btrfs_root *extent_root, u64 type)
4366 chunk_offset = find_next_chunk(extent_root->fs_info);
4367 return __btrfs_alloc_chunk(trans, extent_root, chunk_offset, type);
4370 static noinline int init_first_rw_device(struct btrfs_trans_handle *trans,
4371 struct btrfs_root *root,
4372 struct btrfs_device *device)
4375 u64 sys_chunk_offset;
4377 struct btrfs_fs_info *fs_info = root->fs_info;
4378 struct btrfs_root *extent_root = fs_info->extent_root;
4381 chunk_offset = find_next_chunk(fs_info);
4382 alloc_profile = btrfs_get_alloc_profile(extent_root, 0);
4383 ret = __btrfs_alloc_chunk(trans, extent_root, chunk_offset,
4388 sys_chunk_offset = find_next_chunk(root->fs_info);
4389 alloc_profile = btrfs_get_alloc_profile(fs_info->chunk_root, 0);
4390 ret = __btrfs_alloc_chunk(trans, extent_root, sys_chunk_offset,
4393 btrfs_abort_transaction(trans, root, ret);
4397 ret = btrfs_add_device(trans, fs_info->chunk_root, device);
4399 btrfs_abort_transaction(trans, root, ret);
4404 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset)
4406 struct extent_map *em;
4407 struct map_lookup *map;
4408 struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree;
4412 read_lock(&map_tree->map_tree.lock);
4413 em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1);
4414 read_unlock(&map_tree->map_tree.lock);
4418 if (btrfs_test_opt(root, DEGRADED)) {
4419 free_extent_map(em);
4423 map = (struct map_lookup *)em->bdev;
4424 for (i = 0; i < map->num_stripes; i++) {
4425 if (!map->stripes[i].dev->writeable) {
4430 free_extent_map(em);
4434 void btrfs_mapping_init(struct btrfs_mapping_tree *tree)
4436 extent_map_tree_init(&tree->map_tree);
4439 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree)
4441 struct extent_map *em;
4444 write_lock(&tree->map_tree.lock);
4445 em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1);
4447 remove_extent_mapping(&tree->map_tree, em);
4448 write_unlock(&tree->map_tree.lock);
4453 free_extent_map(em);
4454 /* once for the tree */
4455 free_extent_map(em);
4459 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
4461 struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
4462 struct extent_map *em;
4463 struct map_lookup *map;
4464 struct extent_map_tree *em_tree = &map_tree->map_tree;
4467 read_lock(&em_tree->lock);
4468 em = lookup_extent_mapping(em_tree, logical, len);
4469 read_unlock(&em_tree->lock);
4472 * We could return errors for these cases, but that could get ugly and
4473 * we'd probably do the same thing which is just not do anything else
4474 * and exit, so return 1 so the callers don't try to use other copies.
4477 btrfs_crit(fs_info, "No mapping for %Lu-%Lu\n", logical,
4482 if (em->start > logical || em->start + em->len < logical) {
4483 btrfs_crit(fs_info, "Invalid mapping for %Lu-%Lu, got "
4484 "%Lu-%Lu\n", logical, logical+len, em->start,
4485 em->start + em->len);
4489 map = (struct map_lookup *)em->bdev;
4490 if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1))
4491 ret = map->num_stripes;
4492 else if (map->type & BTRFS_BLOCK_GROUP_RAID10)
4493 ret = map->sub_stripes;
4494 else if (map->type & BTRFS_BLOCK_GROUP_RAID5)
4496 else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
4500 free_extent_map(em);
4502 btrfs_dev_replace_lock(&fs_info->dev_replace);
4503 if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))
4505 btrfs_dev_replace_unlock(&fs_info->dev_replace);
4510 unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
4511 struct btrfs_mapping_tree *map_tree,
4514 struct extent_map *em;
4515 struct map_lookup *map;
4516 struct extent_map_tree *em_tree = &map_tree->map_tree;
4517 unsigned long len = root->sectorsize;
4519 read_lock(&em_tree->lock);
4520 em = lookup_extent_mapping(em_tree, logical, len);
4521 read_unlock(&em_tree->lock);
4524 BUG_ON(em->start > logical || em->start + em->len < logical);
4525 map = (struct map_lookup *)em->bdev;
4526 if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
4527 BTRFS_BLOCK_GROUP_RAID6)) {
4528 len = map->stripe_len * nr_data_stripes(map);
4530 free_extent_map(em);
4534 int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
4535 u64 logical, u64 len, int mirror_num)
4537 struct extent_map *em;
4538 struct map_lookup *map;
4539 struct extent_map_tree *em_tree = &map_tree->map_tree;
4542 read_lock(&em_tree->lock);
4543 em = lookup_extent_mapping(em_tree, logical, len);
4544 read_unlock(&em_tree->lock);
4547 BUG_ON(em->start > logical || em->start + em->len < logical);
4548 map = (struct map_lookup *)em->bdev;
4549 if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
4550 BTRFS_BLOCK_GROUP_RAID6))
4552 free_extent_map(em);
4556 static int find_live_mirror(struct btrfs_fs_info *fs_info,
4557 struct map_lookup *map, int first, int num,
4558 int optimal, int dev_replace_is_ongoing)
4562 struct btrfs_device *srcdev;
4564 if (dev_replace_is_ongoing &&
4565 fs_info->dev_replace.cont_reading_from_srcdev_mode ==
4566 BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID)
4567 srcdev = fs_info->dev_replace.srcdev;
4572 * try to avoid the drive that is the source drive for a
4573 * dev-replace procedure, only choose it if no other non-missing
4574 * mirror is available
4576 for (tolerance = 0; tolerance < 2; tolerance++) {
4577 if (map->stripes[optimal].dev->bdev &&
4578 (tolerance || map->stripes[optimal].dev != srcdev))
4580 for (i = first; i < first + num; i++) {
4581 if (map->stripes[i].dev->bdev &&
4582 (tolerance || map->stripes[i].dev != srcdev))
4587 /* we couldn't find one that doesn't fail. Just return something
4588 * and the io error handling code will clean up eventually
4593 static inline int parity_smaller(u64 a, u64 b)
4598 /* Bubble-sort the stripe set to put the parity/syndrome stripes last */
4599 static void sort_parity_stripes(struct btrfs_bio *bbio, u64 *raid_map)
4601 struct btrfs_bio_stripe s;
4608 for (i = 0; i < bbio->num_stripes - 1; i++) {
4609 if (parity_smaller(raid_map[i], raid_map[i+1])) {
4610 s = bbio->stripes[i];
4612 bbio->stripes[i] = bbio->stripes[i+1];
4613 raid_map[i] = raid_map[i+1];
4614 bbio->stripes[i+1] = s;
4622 static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
4623 u64 logical, u64 *length,
4624 struct btrfs_bio **bbio_ret,
4625 int mirror_num, u64 **raid_map_ret)
4627 struct extent_map *em;
4628 struct map_lookup *map;
4629 struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
4630 struct extent_map_tree *em_tree = &map_tree->map_tree;
4633 u64 stripe_end_offset;
4638 u64 *raid_map = NULL;
4644 struct btrfs_bio *bbio = NULL;
4645 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
4646 int dev_replace_is_ongoing = 0;
4647 int num_alloc_stripes;
4648 int patch_the_first_stripe_for_dev_replace = 0;
4649 u64 physical_to_patch_in_first_stripe = 0;
4650 u64 raid56_full_stripe_start = (u64)-1;
4652 read_lock(&em_tree->lock);
4653 em = lookup_extent_mapping(em_tree, logical, *length);
4654 read_unlock(&em_tree->lock);
4657 btrfs_crit(fs_info, "unable to find logical %llu len %llu",
4662 if (em->start > logical || em->start + em->len < logical) {
4663 btrfs_crit(fs_info, "found a bad mapping, wanted %Lu, "
4664 "found %Lu-%Lu\n", logical, em->start,
4665 em->start + em->len);
4669 map = (struct map_lookup *)em->bdev;
4670 offset = logical - em->start;
4672 stripe_len = map->stripe_len;
4675 * stripe_nr counts the total number of stripes we have to stride
4676 * to get to this block
4678 do_div(stripe_nr, stripe_len);
4680 stripe_offset = stripe_nr * stripe_len;
4681 BUG_ON(offset < stripe_offset);
4683 /* stripe_offset is the offset of this block in its stripe*/
4684 stripe_offset = offset - stripe_offset;
4686 /* if we're here for raid56, we need to know the stripe aligned start */
4687 if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) {
4688 unsigned long full_stripe_len = stripe_len * nr_data_stripes(map);
4689 raid56_full_stripe_start = offset;
4691 /* allow a write of a full stripe, but make sure we don't
4692 * allow straddling of stripes
4694 do_div(raid56_full_stripe_start, full_stripe_len);
4695 raid56_full_stripe_start *= full_stripe_len;
4698 if (rw & REQ_DISCARD) {
4699 /* we don't discard raid56 yet */
4701 (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) {
4705 *length = min_t(u64, em->len - offset, *length);
4706 } else if (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
4708 /* For writes to RAID[56], allow a full stripeset across all disks.
4709 For other RAID types and for RAID[56] reads, just allow a single
4710 stripe (on a single disk). */
4711 if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6) &&
4713 max_len = stripe_len * nr_data_stripes(map) -
4714 (offset - raid56_full_stripe_start);
4716 /* we limit the length of each bio to what fits in a stripe */
4717 max_len = stripe_len - stripe_offset;
4719 *length = min_t(u64, em->len - offset, max_len);
4721 *length = em->len - offset;
4724 /* This is for when we're called from btrfs_merge_bio_hook() and all
4725 it cares about is the length */
4729 btrfs_dev_replace_lock(dev_replace);
4730 dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(dev_replace);
4731 if (!dev_replace_is_ongoing)
4732 btrfs_dev_replace_unlock(dev_replace);
4734 if (dev_replace_is_ongoing && mirror_num == map->num_stripes + 1 &&
4735 !(rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)) &&
4736 dev_replace->tgtdev != NULL) {
4738 * in dev-replace case, for repair case (that's the only
4739 * case where the mirror is selected explicitly when
4740 * calling btrfs_map_block), blocks left of the left cursor
4741 * can also be read from the target drive.
4742 * For REQ_GET_READ_MIRRORS, the target drive is added as
4743 * the last one to the array of stripes. For READ, it also
4744 * needs to be supported using the same mirror number.
4745 * If the requested block is not left of the left cursor,
4746 * EIO is returned. This can happen because btrfs_num_copies()
4747 * returns one more in the dev-replace case.
4749 u64 tmp_length = *length;
4750 struct btrfs_bio *tmp_bbio = NULL;
4751 int tmp_num_stripes;
4752 u64 srcdev_devid = dev_replace->srcdev->devid;
4753 int index_srcdev = 0;
4755 u64 physical_of_found = 0;
4757 ret = __btrfs_map_block(fs_info, REQ_GET_READ_MIRRORS,
4758 logical, &tmp_length, &tmp_bbio, 0, NULL);
4760 WARN_ON(tmp_bbio != NULL);
4764 tmp_num_stripes = tmp_bbio->num_stripes;
4765 if (mirror_num > tmp_num_stripes) {
4767 * REQ_GET_READ_MIRRORS does not contain this
4768 * mirror, that means that the requested area
4769 * is not left of the left cursor
4777 * process the rest of the function using the mirror_num
4778 * of the source drive. Therefore look it up first.
4779 * At the end, patch the device pointer to the one of the
4782 for (i = 0; i < tmp_num_stripes; i++) {
4783 if (tmp_bbio->stripes[i].dev->devid == srcdev_devid) {
4785 * In case of DUP, in order to keep it
4786 * simple, only add the mirror with the
4787 * lowest physical address
4790 physical_of_found <=
4791 tmp_bbio->stripes[i].physical)
4796 tmp_bbio->stripes[i].physical;
4801 mirror_num = index_srcdev + 1;
4802 patch_the_first_stripe_for_dev_replace = 1;
4803 physical_to_patch_in_first_stripe = physical_of_found;
4812 } else if (mirror_num > map->num_stripes) {
4818 stripe_nr_orig = stripe_nr;
4819 stripe_nr_end = ALIGN(offset + *length, map->stripe_len);
4820 do_div(stripe_nr_end, map->stripe_len);
4821 stripe_end_offset = stripe_nr_end * map->stripe_len -
4824 if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
4825 if (rw & REQ_DISCARD)
4826 num_stripes = min_t(u64, map->num_stripes,
4827 stripe_nr_end - stripe_nr_orig);
4828 stripe_index = do_div(stripe_nr, map->num_stripes);
4829 } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
4830 if (rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS))
4831 num_stripes = map->num_stripes;
4832 else if (mirror_num)
4833 stripe_index = mirror_num - 1;
4835 stripe_index = find_live_mirror(fs_info, map, 0,
4837 current->pid % map->num_stripes,
4838 dev_replace_is_ongoing);
4839 mirror_num = stripe_index + 1;
4842 } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
4843 if (rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)) {
4844 num_stripes = map->num_stripes;
4845 } else if (mirror_num) {
4846 stripe_index = mirror_num - 1;
4851 } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
4852 int factor = map->num_stripes / map->sub_stripes;
4854 stripe_index = do_div(stripe_nr, factor);
4855 stripe_index *= map->sub_stripes;
4857 if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS))
4858 num_stripes = map->sub_stripes;
4859 else if (rw & REQ_DISCARD)
4860 num_stripes = min_t(u64, map->sub_stripes *
4861 (stripe_nr_end - stripe_nr_orig),
4863 else if (mirror_num)
4864 stripe_index += mirror_num - 1;
4866 int old_stripe_index = stripe_index;
4867 stripe_index = find_live_mirror(fs_info, map,
4869 map->sub_stripes, stripe_index +
4870 current->pid % map->sub_stripes,
4871 dev_replace_is_ongoing);
4872 mirror_num = stripe_index - old_stripe_index + 1;
4875 } else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
4876 BTRFS_BLOCK_GROUP_RAID6)) {
4879 if (bbio_ret && ((rw & REQ_WRITE) || mirror_num > 1)
4883 /* push stripe_nr back to the start of the full stripe */
4884 stripe_nr = raid56_full_stripe_start;
4885 do_div(stripe_nr, stripe_len);
4887 stripe_index = do_div(stripe_nr, nr_data_stripes(map));
4889 /* RAID[56] write or recovery. Return all stripes */
4890 num_stripes = map->num_stripes;
4891 max_errors = nr_parity_stripes(map);
4893 raid_map = kmalloc(sizeof(u64) * num_stripes,
4900 /* Work out the disk rotation on this stripe-set */
4902 rot = do_div(tmp, num_stripes);
4904 /* Fill in the logical address of each stripe */
4905 tmp = stripe_nr * nr_data_stripes(map);
4906 for (i = 0; i < nr_data_stripes(map); i++)
4907 raid_map[(i+rot) % num_stripes] =
4908 em->start + (tmp + i) * map->stripe_len;
4910 raid_map[(i+rot) % map->num_stripes] = RAID5_P_STRIPE;
4911 if (map->type & BTRFS_BLOCK_GROUP_RAID6)
4912 raid_map[(i+rot+1) % num_stripes] =
4915 *length = map->stripe_len;
4920 * Mirror #0 or #1 means the original data block.
4921 * Mirror #2 is RAID5 parity block.
4922 * Mirror #3 is RAID6 Q block.
4924 stripe_index = do_div(stripe_nr, nr_data_stripes(map));
4926 stripe_index = nr_data_stripes(map) +
4929 /* We distribute the parity blocks across stripes */
4930 tmp = stripe_nr + stripe_index;
4931 stripe_index = do_div(tmp, map->num_stripes);
4935 * after this do_div call, stripe_nr is the number of stripes
4936 * on this device we have to walk to find the data, and
4937 * stripe_index is the number of our device in the stripe array
4939 stripe_index = do_div(stripe_nr, map->num_stripes);
4940 mirror_num = stripe_index + 1;
4942 BUG_ON(stripe_index >= map->num_stripes);
4944 num_alloc_stripes = num_stripes;
4945 if (dev_replace_is_ongoing) {
4946 if (rw & (REQ_WRITE | REQ_DISCARD))
4947 num_alloc_stripes <<= 1;
4948 if (rw & REQ_GET_READ_MIRRORS)
4949 num_alloc_stripes++;
4951 bbio = kzalloc(btrfs_bio_size(num_alloc_stripes), GFP_NOFS);
4957 atomic_set(&bbio->error, 0);
4959 if (rw & REQ_DISCARD) {
4961 int sub_stripes = 0;
4962 u64 stripes_per_dev = 0;
4963 u32 remaining_stripes = 0;
4964 u32 last_stripe = 0;
4967 (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID10)) {
4968 if (map->type & BTRFS_BLOCK_GROUP_RAID0)
4971 sub_stripes = map->sub_stripes;
4973 factor = map->num_stripes / sub_stripes;
4974 stripes_per_dev = div_u64_rem(stripe_nr_end -
4977 &remaining_stripes);
4978 div_u64_rem(stripe_nr_end - 1, factor, &last_stripe);
4979 last_stripe *= sub_stripes;
4982 for (i = 0; i < num_stripes; i++) {
4983 bbio->stripes[i].physical =
4984 map->stripes[stripe_index].physical +
4985 stripe_offset + stripe_nr * map->stripe_len;
4986 bbio->stripes[i].dev = map->stripes[stripe_index].dev;
4988 if (map->type & (BTRFS_BLOCK_GROUP_RAID0 |
4989 BTRFS_BLOCK_GROUP_RAID10)) {
4990 bbio->stripes[i].length = stripes_per_dev *
4993 if (i / sub_stripes < remaining_stripes)
4994 bbio->stripes[i].length +=
4998 * Special for the first stripe and
5001 * |-------|...|-------|
5005 if (i < sub_stripes)
5006 bbio->stripes[i].length -=
5009 if (stripe_index >= last_stripe &&
5010 stripe_index <= (last_stripe +
5012 bbio->stripes[i].length -=
5015 if (i == sub_stripes - 1)
5018 bbio->stripes[i].length = *length;
5021 if (stripe_index == map->num_stripes) {
5022 /* This could only happen for RAID0/10 */
5028 for (i = 0; i < num_stripes; i++) {
5029 bbio->stripes[i].physical =
5030 map->stripes[stripe_index].physical +
5032 stripe_nr * map->stripe_len;
5033 bbio->stripes[i].dev =
5034 map->stripes[stripe_index].dev;
5039 if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) {
5040 if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
5041 BTRFS_BLOCK_GROUP_RAID10 |
5042 BTRFS_BLOCK_GROUP_RAID5 |
5043 BTRFS_BLOCK_GROUP_DUP)) {
5045 } else if (map->type & BTRFS_BLOCK_GROUP_RAID6) {
5050 if (dev_replace_is_ongoing && (rw & (REQ_WRITE | REQ_DISCARD)) &&
5051 dev_replace->tgtdev != NULL) {
5052 int index_where_to_add;
5053 u64 srcdev_devid = dev_replace->srcdev->devid;
5056 * duplicate the write operations while the dev replace
5057 * procedure is running. Since the copying of the old disk
5058 * to the new disk takes place at run time while the
5059 * filesystem is mounted writable, the regular write
5060 * operations to the old disk have to be duplicated to go
5061 * to the new disk as well.
5062 * Note that device->missing is handled by the caller, and
5063 * that the write to the old disk is already set up in the
5066 index_where_to_add = num_stripes;
5067 for (i = 0; i < num_stripes; i++) {
5068 if (bbio->stripes[i].dev->devid == srcdev_devid) {
5069 /* write to new disk, too */
5070 struct btrfs_bio_stripe *new =
5071 bbio->stripes + index_where_to_add;
5072 struct btrfs_bio_stripe *old =
5075 new->physical = old->physical;
5076 new->length = old->length;
5077 new->dev = dev_replace->tgtdev;
5078 index_where_to_add++;
5082 num_stripes = index_where_to_add;
5083 } else if (dev_replace_is_ongoing && (rw & REQ_GET_READ_MIRRORS) &&
5084 dev_replace->tgtdev != NULL) {
5085 u64 srcdev_devid = dev_replace->srcdev->devid;
5086 int index_srcdev = 0;
5088 u64 physical_of_found = 0;
5091 * During the dev-replace procedure, the target drive can
5092 * also be used to read data in case it is needed to repair
5093 * a corrupt block elsewhere. This is possible if the
5094 * requested area is left of the left cursor. In this area,
5095 * the target drive is a full copy of the source drive.
5097 for (i = 0; i < num_stripes; i++) {
5098 if (bbio->stripes[i].dev->devid == srcdev_devid) {
5100 * In case of DUP, in order to keep it
5101 * simple, only add the mirror with the
5102 * lowest physical address
5105 physical_of_found <=
5106 bbio->stripes[i].physical)
5110 physical_of_found = bbio->stripes[i].physical;
5114 u64 length = map->stripe_len;
5116 if (physical_of_found + length <=
5117 dev_replace->cursor_left) {
5118 struct btrfs_bio_stripe *tgtdev_stripe =
5119 bbio->stripes + num_stripes;
5121 tgtdev_stripe->physical = physical_of_found;
5122 tgtdev_stripe->length =
5123 bbio->stripes[index_srcdev].length;
5124 tgtdev_stripe->dev = dev_replace->tgtdev;
5132 bbio->num_stripes = num_stripes;
5133 bbio->max_errors = max_errors;
5134 bbio->mirror_num = mirror_num;
5137 * this is the case that REQ_READ && dev_replace_is_ongoing &&
5138 * mirror_num == num_stripes + 1 && dev_replace target drive is
5139 * available as a mirror
5141 if (patch_the_first_stripe_for_dev_replace && num_stripes > 0) {
5142 WARN_ON(num_stripes > 1);
5143 bbio->stripes[0].dev = dev_replace->tgtdev;
5144 bbio->stripes[0].physical = physical_to_patch_in_first_stripe;
5145 bbio->mirror_num = map->num_stripes + 1;
5148 sort_parity_stripes(bbio, raid_map);
5149 *raid_map_ret = raid_map;
5152 if (dev_replace_is_ongoing)
5153 btrfs_dev_replace_unlock(dev_replace);
5154 free_extent_map(em);
5158 int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
5159 u64 logical, u64 *length,
5160 struct btrfs_bio **bbio_ret, int mirror_num)
5162 return __btrfs_map_block(fs_info, rw, logical, length, bbio_ret,
5166 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
5167 u64 chunk_start, u64 physical, u64 devid,
5168 u64 **logical, int *naddrs, int *stripe_len)
5170 struct extent_map_tree *em_tree = &map_tree->map_tree;
5171 struct extent_map *em;
5172 struct map_lookup *map;
5180 read_lock(&em_tree->lock);
5181 em = lookup_extent_mapping(em_tree, chunk_start, 1);
5182 read_unlock(&em_tree->lock);
5185 printk(KERN_ERR "btrfs: couldn't find em for chunk %Lu\n",
5190 if (em->start != chunk_start) {
5191 printk(KERN_ERR "btrfs: bad chunk start, em=%Lu, wanted=%Lu\n",
5192 em->start, chunk_start);
5193 free_extent_map(em);
5196 map = (struct map_lookup *)em->bdev;
5199 rmap_len = map->stripe_len;
5201 if (map->type & BTRFS_BLOCK_GROUP_RAID10)
5202 do_div(length, map->num_stripes / map->sub_stripes);
5203 else if (map->type & BTRFS_BLOCK_GROUP_RAID0)
5204 do_div(length, map->num_stripes);
5205 else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
5206 BTRFS_BLOCK_GROUP_RAID6)) {
5207 do_div(length, nr_data_stripes(map));
5208 rmap_len = map->stripe_len * nr_data_stripes(map);
5211 buf = kzalloc(sizeof(u64) * map->num_stripes, GFP_NOFS);
5212 BUG_ON(!buf); /* -ENOMEM */
5214 for (i = 0; i < map->num_stripes; i++) {
5215 if (devid && map->stripes[i].dev->devid != devid)
5217 if (map->stripes[i].physical > physical ||
5218 map->stripes[i].physical + length <= physical)
5221 stripe_nr = physical - map->stripes[i].physical;
5222 do_div(stripe_nr, map->stripe_len);
5224 if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
5225 stripe_nr = stripe_nr * map->num_stripes + i;
5226 do_div(stripe_nr, map->sub_stripes);
5227 } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
5228 stripe_nr = stripe_nr * map->num_stripes + i;
5229 } /* else if RAID[56], multiply by nr_data_stripes().
5230 * Alternatively, just use rmap_len below instead of
5231 * map->stripe_len */
5233 bytenr = chunk_start + stripe_nr * rmap_len;
5234 WARN_ON(nr >= map->num_stripes);
5235 for (j = 0; j < nr; j++) {
5236 if (buf[j] == bytenr)
5240 WARN_ON(nr >= map->num_stripes);
5247 *stripe_len = rmap_len;
5249 free_extent_map(em);
5253 static void btrfs_end_bio(struct bio *bio, int err)
5255 struct btrfs_bio *bbio = bio->bi_private;
5256 int is_orig_bio = 0;
5259 atomic_inc(&bbio->error);
5260 if (err == -EIO || err == -EREMOTEIO) {
5261 unsigned int stripe_index =
5262 btrfs_io_bio(bio)->stripe_index;
5263 struct btrfs_device *dev;
5265 BUG_ON(stripe_index >= bbio->num_stripes);
5266 dev = bbio->stripes[stripe_index].dev;
5268 if (bio->bi_rw & WRITE)
5269 btrfs_dev_stat_inc(dev,
5270 BTRFS_DEV_STAT_WRITE_ERRS);
5272 btrfs_dev_stat_inc(dev,
5273 BTRFS_DEV_STAT_READ_ERRS);
5274 if ((bio->bi_rw & WRITE_FLUSH) == WRITE_FLUSH)
5275 btrfs_dev_stat_inc(dev,
5276 BTRFS_DEV_STAT_FLUSH_ERRS);
5277 btrfs_dev_stat_print_on_error(dev);
5282 if (bio == bbio->orig_bio)
5285 if (atomic_dec_and_test(&bbio->stripes_pending)) {
5288 bio = bbio->orig_bio;
5290 bio->bi_private = bbio->private;
5291 bio->bi_end_io = bbio->end_io;
5292 btrfs_io_bio(bio)->mirror_num = bbio->mirror_num;
5293 /* only send an error to the higher layers if it is
5294 * beyond the tolerance of the btrfs bio
5296 if (atomic_read(&bbio->error) > bbio->max_errors) {
5300 * this bio is actually up to date, we didn't
5301 * go over the max number of errors
5303 set_bit(BIO_UPTODATE, &bio->bi_flags);
5308 bio_endio(bio, err);
5309 } else if (!is_orig_bio) {
5314 struct async_sched {
5317 struct btrfs_fs_info *info;
5318 struct btrfs_work work;
5322 * see run_scheduled_bios for a description of why bios are collected for
5325 * This will add one bio to the pending list for a device and make sure
5326 * the work struct is scheduled.
5328 static noinline void btrfs_schedule_bio(struct btrfs_root *root,
5329 struct btrfs_device *device,
5330 int rw, struct bio *bio)
5332 int should_queue = 1;
5333 struct btrfs_pending_bios *pending_bios;
5335 if (device->missing || !device->bdev) {
5336 bio_endio(bio, -EIO);
5340 /* don't bother with additional async steps for reads, right now */
5341 if (!(rw & REQ_WRITE)) {
5343 btrfsic_submit_bio(rw, bio);
5349 * nr_async_bios allows us to reliably return congestion to the
5350 * higher layers. Otherwise, the async bio makes it appear we have
5351 * made progress against dirty pages when we've really just put it
5352 * on a queue for later
5354 atomic_inc(&root->fs_info->nr_async_bios);
5355 WARN_ON(bio->bi_next);
5356 bio->bi_next = NULL;
5359 spin_lock(&device->io_lock);
5360 if (bio->bi_rw & REQ_SYNC)
5361 pending_bios = &device->pending_sync_bios;
5363 pending_bios = &device->pending_bios;
5365 if (pending_bios->tail)
5366 pending_bios->tail->bi_next = bio;
5368 pending_bios->tail = bio;
5369 if (!pending_bios->head)
5370 pending_bios->head = bio;
5371 if (device->running_pending)
5374 spin_unlock(&device->io_lock);
5377 btrfs_queue_worker(&root->fs_info->submit_workers,
5381 static int bio_size_ok(struct block_device *bdev, struct bio *bio,
5384 struct bio_vec *prev;
5385 struct request_queue *q = bdev_get_queue(bdev);
5386 unsigned short max_sectors = queue_max_sectors(q);
5387 struct bvec_merge_data bvm = {
5389 .bi_sector = sector,
5390 .bi_rw = bio->bi_rw,
5393 if (bio->bi_vcnt == 0) {
5398 prev = &bio->bi_io_vec[bio->bi_vcnt - 1];
5399 if (bio_sectors(bio) > max_sectors)
5402 if (!q->merge_bvec_fn)
5405 bvm.bi_size = bio->bi_size - prev->bv_len;
5406 if (q->merge_bvec_fn(q, &bvm, prev) < prev->bv_len)
5411 static void submit_stripe_bio(struct btrfs_root *root, struct btrfs_bio *bbio,
5412 struct bio *bio, u64 physical, int dev_nr,
5415 struct btrfs_device *dev = bbio->stripes[dev_nr].dev;
5417 bio->bi_private = bbio;
5418 btrfs_io_bio(bio)->stripe_index = dev_nr;
5419 bio->bi_end_io = btrfs_end_bio;
5420 bio->bi_sector = physical >> 9;
5423 struct rcu_string *name;
5426 name = rcu_dereference(dev->name);
5427 pr_debug("btrfs_map_bio: rw %d, sector=%llu, dev=%lu "
5428 "(%s id %llu), size=%u\n", rw,
5429 (u64)bio->bi_sector, (u_long)dev->bdev->bd_dev,
5430 name->str, dev->devid, bio->bi_size);
5434 bio->bi_bdev = dev->bdev;
5436 btrfs_schedule_bio(root, dev, rw, bio);
5438 btrfsic_submit_bio(rw, bio);
5441 static int breakup_stripe_bio(struct btrfs_root *root, struct btrfs_bio *bbio,
5442 struct bio *first_bio, struct btrfs_device *dev,
5443 int dev_nr, int rw, int async)
5445 struct bio_vec *bvec = first_bio->bi_io_vec;
5447 int nr_vecs = bio_get_nr_vecs(dev->bdev);
5448 u64 physical = bbio->stripes[dev_nr].physical;
5451 bio = btrfs_bio_alloc(dev->bdev, physical >> 9, nr_vecs, GFP_NOFS);
5455 while (bvec <= (first_bio->bi_io_vec + first_bio->bi_vcnt - 1)) {
5456 if (bio_add_page(bio, bvec->bv_page, bvec->bv_len,
5457 bvec->bv_offset) < bvec->bv_len) {
5458 u64 len = bio->bi_size;
5460 atomic_inc(&bbio->stripes_pending);
5461 submit_stripe_bio(root, bbio, bio, physical, dev_nr,
5469 submit_stripe_bio(root, bbio, bio, physical, dev_nr, rw, async);
5473 static void bbio_error(struct btrfs_bio *bbio, struct bio *bio, u64 logical)
5475 atomic_inc(&bbio->error);
5476 if (atomic_dec_and_test(&bbio->stripes_pending)) {
5477 bio->bi_private = bbio->private;
5478 bio->bi_end_io = bbio->end_io;
5479 btrfs_io_bio(bio)->mirror_num = bbio->mirror_num;
5480 bio->bi_sector = logical >> 9;
5482 bio_endio(bio, -EIO);
5486 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
5487 int mirror_num, int async_submit)
5489 struct btrfs_device *dev;
5490 struct bio *first_bio = bio;
5491 u64 logical = (u64)bio->bi_sector << 9;
5494 u64 *raid_map = NULL;
5498 struct btrfs_bio *bbio = NULL;
5500 length = bio->bi_size;
5501 map_length = length;
5503 ret = __btrfs_map_block(root->fs_info, rw, logical, &map_length, &bbio,
5504 mirror_num, &raid_map);
5505 if (ret) /* -ENOMEM */
5508 total_devs = bbio->num_stripes;
5509 bbio->orig_bio = first_bio;
5510 bbio->private = first_bio->bi_private;
5511 bbio->end_io = first_bio->bi_end_io;
5512 atomic_set(&bbio->stripes_pending, bbio->num_stripes);
5515 /* In this case, map_length has been set to the length of
5516 a single stripe; not the whole write */
5518 return raid56_parity_write(root, bio, bbio,
5519 raid_map, map_length);
5521 return raid56_parity_recover(root, bio, bbio,
5522 raid_map, map_length,
5527 if (map_length < length) {
5528 btrfs_crit(root->fs_info, "mapping failed logical %llu bio len %llu len %llu",
5529 logical, length, map_length);
5533 while (dev_nr < total_devs) {
5534 dev = bbio->stripes[dev_nr].dev;
5535 if (!dev || !dev->bdev || (rw & WRITE && !dev->writeable)) {
5536 bbio_error(bbio, first_bio, logical);
5542 * Check and see if we're ok with this bio based on it's size
5543 * and offset with the given device.
5545 if (!bio_size_ok(dev->bdev, first_bio,
5546 bbio->stripes[dev_nr].physical >> 9)) {
5547 ret = breakup_stripe_bio(root, bbio, first_bio, dev,
5548 dev_nr, rw, async_submit);
5554 if (dev_nr < total_devs - 1) {
5555 bio = btrfs_bio_clone(first_bio, GFP_NOFS);
5556 BUG_ON(!bio); /* -ENOMEM */
5561 submit_stripe_bio(root, bbio, bio,
5562 bbio->stripes[dev_nr].physical, dev_nr, rw,
5569 struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
5572 struct btrfs_device *device;
5573 struct btrfs_fs_devices *cur_devices;
5575 cur_devices = fs_info->fs_devices;
5576 while (cur_devices) {
5578 !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) {
5579 device = __find_device(&cur_devices->devices,
5584 cur_devices = cur_devices->seed;
5589 static struct btrfs_device *add_missing_dev(struct btrfs_root *root,
5590 u64 devid, u8 *dev_uuid)
5592 struct btrfs_device *device;
5593 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
5595 device = btrfs_alloc_device(NULL, &devid, dev_uuid);
5599 list_add(&device->dev_list, &fs_devices->devices);
5600 device->fs_devices = fs_devices;
5601 fs_devices->num_devices++;
5603 device->missing = 1;
5604 fs_devices->missing_devices++;
5610 * btrfs_alloc_device - allocate struct btrfs_device
5611 * @fs_info: used only for generating a new devid, can be NULL if
5612 * devid is provided (i.e. @devid != NULL).
5613 * @devid: a pointer to devid for this device. If NULL a new devid
5615 * @uuid: a pointer to UUID for this device. If NULL a new UUID
5618 * Return: a pointer to a new &struct btrfs_device on success; ERR_PTR()
5619 * on error. Returned struct is not linked onto any lists and can be
5620 * destroyed with kfree() right away.
5622 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
5626 struct btrfs_device *dev;
5629 if (!devid && !fs_info) {
5631 return ERR_PTR(-EINVAL);
5634 dev = __alloc_device();
5643 ret = find_next_devid(fs_info, &tmp);
5646 return ERR_PTR(ret);
5652 memcpy(dev->uuid, uuid, BTRFS_UUID_SIZE);
5654 generate_random_uuid(dev->uuid);
5656 dev->work.func = pending_bios_fn;
5661 static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
5662 struct extent_buffer *leaf,
5663 struct btrfs_chunk *chunk)
5665 struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree;
5666 struct map_lookup *map;
5667 struct extent_map *em;
5671 u8 uuid[BTRFS_UUID_SIZE];
5676 logical = key->offset;
5677 length = btrfs_chunk_length(leaf, chunk);
5679 read_lock(&map_tree->map_tree.lock);
5680 em = lookup_extent_mapping(&map_tree->map_tree, logical, 1);
5681 read_unlock(&map_tree->map_tree.lock);
5683 /* already mapped? */
5684 if (em && em->start <= logical && em->start + em->len > logical) {
5685 free_extent_map(em);
5688 free_extent_map(em);
5691 em = alloc_extent_map();
5694 num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
5695 map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
5697 free_extent_map(em);
5701 em->bdev = (struct block_device *)map;
5702 em->start = logical;
5705 em->block_start = 0;
5706 em->block_len = em->len;
5708 map->num_stripes = num_stripes;
5709 map->io_width = btrfs_chunk_io_width(leaf, chunk);
5710 map->io_align = btrfs_chunk_io_align(leaf, chunk);
5711 map->sector_size = btrfs_chunk_sector_size(leaf, chunk);
5712 map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
5713 map->type = btrfs_chunk_type(leaf, chunk);
5714 map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);
5715 for (i = 0; i < num_stripes; i++) {
5716 map->stripes[i].physical =
5717 btrfs_stripe_offset_nr(leaf, chunk, i);
5718 devid = btrfs_stripe_devid_nr(leaf, chunk, i);
5719 read_extent_buffer(leaf, uuid, (unsigned long)
5720 btrfs_stripe_dev_uuid_nr(chunk, i),
5722 map->stripes[i].dev = btrfs_find_device(root->fs_info, devid,
5724 if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) {
5726 free_extent_map(em);
5729 if (!map->stripes[i].dev) {
5730 map->stripes[i].dev =
5731 add_missing_dev(root, devid, uuid);
5732 if (!map->stripes[i].dev) {
5734 free_extent_map(em);
5738 map->stripes[i].dev->in_fs_metadata = 1;
5741 write_lock(&map_tree->map_tree.lock);
5742 ret = add_extent_mapping(&map_tree->map_tree, em, 0);
5743 write_unlock(&map_tree->map_tree.lock);
5744 BUG_ON(ret); /* Tree corruption */
5745 free_extent_map(em);
5750 static void fill_device_from_item(struct extent_buffer *leaf,
5751 struct btrfs_dev_item *dev_item,
5752 struct btrfs_device *device)
5756 device->devid = btrfs_device_id(leaf, dev_item);
5757 device->disk_total_bytes = btrfs_device_total_bytes(leaf, dev_item);
5758 device->total_bytes = device->disk_total_bytes;
5759 device->bytes_used = btrfs_device_bytes_used(leaf, dev_item);
5760 device->type = btrfs_device_type(leaf, dev_item);
5761 device->io_align = btrfs_device_io_align(leaf, dev_item);
5762 device->io_width = btrfs_device_io_width(leaf, dev_item);
5763 device->sector_size = btrfs_device_sector_size(leaf, dev_item);
5764 WARN_ON(device->devid == BTRFS_DEV_REPLACE_DEVID);
5765 device->is_tgtdev_for_dev_replace = 0;
5767 ptr = btrfs_device_uuid(dev_item);
5768 read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE);
5771 static int open_seed_devices(struct btrfs_root *root, u8 *fsid)
5773 struct btrfs_fs_devices *fs_devices;
5776 BUG_ON(!mutex_is_locked(&uuid_mutex));
5778 fs_devices = root->fs_info->fs_devices->seed;
5779 while (fs_devices) {
5780 if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE)) {
5784 fs_devices = fs_devices->seed;
5787 fs_devices = find_fsid(fsid);
5793 fs_devices = clone_fs_devices(fs_devices);
5794 if (IS_ERR(fs_devices)) {
5795 ret = PTR_ERR(fs_devices);
5799 ret = __btrfs_open_devices(fs_devices, FMODE_READ,
5800 root->fs_info->bdev_holder);
5802 free_fs_devices(fs_devices);
5806 if (!fs_devices->seeding) {
5807 __btrfs_close_devices(fs_devices);
5808 free_fs_devices(fs_devices);
5813 fs_devices->seed = root->fs_info->fs_devices->seed;
5814 root->fs_info->fs_devices->seed = fs_devices;
5819 static int read_one_dev(struct btrfs_root *root,
5820 struct extent_buffer *leaf,
5821 struct btrfs_dev_item *dev_item)
5823 struct btrfs_device *device;
5826 u8 fs_uuid[BTRFS_UUID_SIZE];
5827 u8 dev_uuid[BTRFS_UUID_SIZE];
5829 devid = btrfs_device_id(leaf, dev_item);
5830 read_extent_buffer(leaf, dev_uuid, btrfs_device_uuid(dev_item),
5832 read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item),
5835 if (memcmp(fs_uuid, root->fs_info->fsid, BTRFS_UUID_SIZE)) {
5836 ret = open_seed_devices(root, fs_uuid);
5837 if (ret && !btrfs_test_opt(root, DEGRADED))
5841 device = btrfs_find_device(root->fs_info, devid, dev_uuid, fs_uuid);
5842 if (!device || !device->bdev) {
5843 if (!btrfs_test_opt(root, DEGRADED))
5847 btrfs_warn(root->fs_info, "devid %llu missing", devid);
5848 device = add_missing_dev(root, devid, dev_uuid);
5851 } else if (!device->missing) {
5853 * this happens when a device that was properly setup
5854 * in the device info lists suddenly goes bad.
5855 * device->bdev is NULL, and so we have to set
5856 * device->missing to one here
5858 root->fs_info->fs_devices->missing_devices++;
5859 device->missing = 1;
5863 if (device->fs_devices != root->fs_info->fs_devices) {
5864 BUG_ON(device->writeable);
5865 if (device->generation !=
5866 btrfs_device_generation(leaf, dev_item))
5870 fill_device_from_item(leaf, dev_item, device);
5871 device->in_fs_metadata = 1;
5872 if (device->writeable && !device->is_tgtdev_for_dev_replace) {
5873 device->fs_devices->total_rw_bytes += device->total_bytes;
5874 spin_lock(&root->fs_info->free_chunk_lock);
5875 root->fs_info->free_chunk_space += device->total_bytes -
5877 spin_unlock(&root->fs_info->free_chunk_lock);
5883 int btrfs_read_sys_array(struct btrfs_root *root)
5885 struct btrfs_super_block *super_copy = root->fs_info->super_copy;
5886 struct extent_buffer *sb;
5887 struct btrfs_disk_key *disk_key;
5888 struct btrfs_chunk *chunk;
5890 unsigned long sb_ptr;
5896 struct btrfs_key key;
5898 sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET,
5899 BTRFS_SUPER_INFO_SIZE);
5902 btrfs_set_buffer_uptodate(sb);
5903 btrfs_set_buffer_lockdep_class(root->root_key.objectid, sb, 0);
5905 * The sb extent buffer is artifical and just used to read the system array.
5906 * btrfs_set_buffer_uptodate() call does not properly mark all it's
5907 * pages up-to-date when the page is larger: extent does not cover the
5908 * whole page and consequently check_page_uptodate does not find all
5909 * the page's extents up-to-date (the hole beyond sb),
5910 * write_extent_buffer then triggers a WARN_ON.
5912 * Regular short extents go through mark_extent_buffer_dirty/writeback cycle,
5913 * but sb spans only this function. Add an explicit SetPageUptodate call
5914 * to silence the warning eg. on PowerPC 64.
5916 if (PAGE_CACHE_SIZE > BTRFS_SUPER_INFO_SIZE)
5917 SetPageUptodate(sb->pages[0]);
5919 write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE);
5920 array_size = btrfs_super_sys_array_size(super_copy);
5922 ptr = super_copy->sys_chunk_array;
5923 sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array);
5926 while (cur < array_size) {
5927 disk_key = (struct btrfs_disk_key *)ptr;
5928 btrfs_disk_key_to_cpu(&key, disk_key);
5930 len = sizeof(*disk_key); ptr += len;
5934 if (key.type == BTRFS_CHUNK_ITEM_KEY) {
5935 chunk = (struct btrfs_chunk *)sb_ptr;
5936 ret = read_one_chunk(root, &key, sb, chunk);
5939 num_stripes = btrfs_chunk_num_stripes(sb, chunk);
5940 len = btrfs_chunk_item_size(num_stripes);
5949 free_extent_buffer(sb);
5953 int btrfs_read_chunk_tree(struct btrfs_root *root)
5955 struct btrfs_path *path;
5956 struct extent_buffer *leaf;
5957 struct btrfs_key key;
5958 struct btrfs_key found_key;
5962 root = root->fs_info->chunk_root;
5964 path = btrfs_alloc_path();
5968 mutex_lock(&uuid_mutex);
5972 * Read all device items, and then all the chunk items. All
5973 * device items are found before any chunk item (their object id
5974 * is smaller than the lowest possible object id for a chunk
5975 * item - BTRFS_FIRST_CHUNK_TREE_OBJECTID).
5977 key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
5980 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
5984 leaf = path->nodes[0];
5985 slot = path->slots[0];
5986 if (slot >= btrfs_header_nritems(leaf)) {
5987 ret = btrfs_next_leaf(root, path);
5994 btrfs_item_key_to_cpu(leaf, &found_key, slot);
5995 if (found_key.type == BTRFS_DEV_ITEM_KEY) {
5996 struct btrfs_dev_item *dev_item;
5997 dev_item = btrfs_item_ptr(leaf, slot,
5998 struct btrfs_dev_item);
5999 ret = read_one_dev(root, leaf, dev_item);
6002 } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) {
6003 struct btrfs_chunk *chunk;
6004 chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
6005 ret = read_one_chunk(root, &found_key, leaf, chunk);
6013 unlock_chunks(root);
6014 mutex_unlock(&uuid_mutex);
6016 btrfs_free_path(path);
6020 void btrfs_init_devices_late(struct btrfs_fs_info *fs_info)
6022 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
6023 struct btrfs_device *device;
6025 mutex_lock(&fs_devices->device_list_mutex);
6026 list_for_each_entry(device, &fs_devices->devices, dev_list)
6027 device->dev_root = fs_info->dev_root;
6028 mutex_unlock(&fs_devices->device_list_mutex);
6031 static void __btrfs_reset_dev_stats(struct btrfs_device *dev)
6035 for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++)
6036 btrfs_dev_stat_reset(dev, i);
6039 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info)
6041 struct btrfs_key key;
6042 struct btrfs_key found_key;
6043 struct btrfs_root *dev_root = fs_info->dev_root;
6044 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
6045 struct extent_buffer *eb;
6048 struct btrfs_device *device;
6049 struct btrfs_path *path = NULL;
6052 path = btrfs_alloc_path();
6058 mutex_lock(&fs_devices->device_list_mutex);
6059 list_for_each_entry(device, &fs_devices->devices, dev_list) {
6061 struct btrfs_dev_stats_item *ptr;
6064 key.type = BTRFS_DEV_STATS_KEY;
6065 key.offset = device->devid;
6066 ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0);
6068 __btrfs_reset_dev_stats(device);
6069 device->dev_stats_valid = 1;
6070 btrfs_release_path(path);
6073 slot = path->slots[0];
6074 eb = path->nodes[0];
6075 btrfs_item_key_to_cpu(eb, &found_key, slot);
6076 item_size = btrfs_item_size_nr(eb, slot);
6078 ptr = btrfs_item_ptr(eb, slot,
6079 struct btrfs_dev_stats_item);
6081 for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) {
6082 if (item_size >= (1 + i) * sizeof(__le64))
6083 btrfs_dev_stat_set(device, i,
6084 btrfs_dev_stats_value(eb, ptr, i));
6086 btrfs_dev_stat_reset(device, i);
6089 device->dev_stats_valid = 1;
6090 btrfs_dev_stat_print_on_load(device);
6091 btrfs_release_path(path);
6093 mutex_unlock(&fs_devices->device_list_mutex);
6096 btrfs_free_path(path);
6097 return ret < 0 ? ret : 0;
6100 static int update_dev_stat_item(struct btrfs_trans_handle *trans,
6101 struct btrfs_root *dev_root,
6102 struct btrfs_device *device)
6104 struct btrfs_path *path;
6105 struct btrfs_key key;
6106 struct extent_buffer *eb;
6107 struct btrfs_dev_stats_item *ptr;
6112 key.type = BTRFS_DEV_STATS_KEY;
6113 key.offset = device->devid;
6115 path = btrfs_alloc_path();
6117 ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1);
6119 printk_in_rcu(KERN_WARNING "btrfs: error %d while searching for dev_stats item for device %s!\n",
6120 ret, rcu_str_deref(device->name));
6125 btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) {
6126 /* need to delete old one and insert a new one */
6127 ret = btrfs_del_item(trans, dev_root, path);
6129 printk_in_rcu(KERN_WARNING "btrfs: delete too small dev_stats item for device %s failed %d!\n",
6130 rcu_str_deref(device->name), ret);
6137 /* need to insert a new item */
6138 btrfs_release_path(path);
6139 ret = btrfs_insert_empty_item(trans, dev_root, path,
6140 &key, sizeof(*ptr));
6142 printk_in_rcu(KERN_WARNING "btrfs: insert dev_stats item for device %s failed %d!\n",
6143 rcu_str_deref(device->name), ret);
6148 eb = path->nodes[0];
6149 ptr = btrfs_item_ptr(eb, path->slots[0], struct btrfs_dev_stats_item);
6150 for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++)
6151 btrfs_set_dev_stats_value(eb, ptr, i,
6152 btrfs_dev_stat_read(device, i));
6153 btrfs_mark_buffer_dirty(eb);
6156 btrfs_free_path(path);
6161 * called from commit_transaction. Writes all changed device stats to disk.
6163 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
6164 struct btrfs_fs_info *fs_info)
6166 struct btrfs_root *dev_root = fs_info->dev_root;
6167 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
6168 struct btrfs_device *device;
6171 mutex_lock(&fs_devices->device_list_mutex);
6172 list_for_each_entry(device, &fs_devices->devices, dev_list) {
6173 if (!device->dev_stats_valid || !device->dev_stats_dirty)
6176 ret = update_dev_stat_item(trans, dev_root, device);
6178 device->dev_stats_dirty = 0;
6180 mutex_unlock(&fs_devices->device_list_mutex);
6185 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index)
6187 btrfs_dev_stat_inc(dev, index);
6188 btrfs_dev_stat_print_on_error(dev);
6191 static void btrfs_dev_stat_print_on_error(struct btrfs_device *dev)
6193 if (!dev->dev_stats_valid)
6195 printk_ratelimited_in_rcu(KERN_ERR
6196 "btrfs: bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n",
6197 rcu_str_deref(dev->name),
6198 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS),
6199 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS),
6200 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS),
6201 btrfs_dev_stat_read(dev,
6202 BTRFS_DEV_STAT_CORRUPTION_ERRS),
6203 btrfs_dev_stat_read(dev,
6204 BTRFS_DEV_STAT_GENERATION_ERRS));
6207 static void btrfs_dev_stat_print_on_load(struct btrfs_device *dev)
6211 for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++)
6212 if (btrfs_dev_stat_read(dev, i) != 0)
6214 if (i == BTRFS_DEV_STAT_VALUES_MAX)
6215 return; /* all values == 0, suppress message */
6217 printk_in_rcu(KERN_INFO "btrfs: bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n",
6218 rcu_str_deref(dev->name),
6219 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS),
6220 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS),
6221 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS),
6222 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_CORRUPTION_ERRS),
6223 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_GENERATION_ERRS));
6226 int btrfs_get_dev_stats(struct btrfs_root *root,
6227 struct btrfs_ioctl_get_dev_stats *stats)
6229 struct btrfs_device *dev;
6230 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
6233 mutex_lock(&fs_devices->device_list_mutex);
6234 dev = btrfs_find_device(root->fs_info, stats->devid, NULL, NULL);
6235 mutex_unlock(&fs_devices->device_list_mutex);
6239 "btrfs: get dev_stats failed, device not found\n");
6241 } else if (!dev->dev_stats_valid) {
6243 "btrfs: get dev_stats failed, not yet valid\n");
6245 } else if (stats->flags & BTRFS_DEV_STATS_RESET) {
6246 for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) {
6247 if (stats->nr_items > i)
6249 btrfs_dev_stat_read_and_reset(dev, i);
6251 btrfs_dev_stat_reset(dev, i);
6254 for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++)
6255 if (stats->nr_items > i)
6256 stats->values[i] = btrfs_dev_stat_read(dev, i);
6258 if (stats->nr_items > BTRFS_DEV_STAT_VALUES_MAX)
6259 stats->nr_items = BTRFS_DEV_STAT_VALUES_MAX;
6263 int btrfs_scratch_superblock(struct btrfs_device *device)
6265 struct buffer_head *bh;
6266 struct btrfs_super_block *disk_super;
6268 bh = btrfs_read_dev_super(device->bdev);
6271 disk_super = (struct btrfs_super_block *)bh->b_data;
6273 memset(&disk_super->magic, 0, sizeof(disk_super->magic));
6274 set_buffer_dirty(bh);
6275 sync_dirty_buffer(bh);