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>
30 #include "extent_map.h"
32 #include "transaction.h"
33 #include "print-tree.h"
35 #include "async-thread.h"
36 #include "check-integrity.h"
37 #include "rcu-string.h"
39 #include "dev-replace.h"
41 static int init_first_rw_device(struct btrfs_trans_handle *trans,
42 struct btrfs_root *root,
43 struct btrfs_device *device);
44 static int btrfs_relocate_sys_chunks(struct btrfs_root *root);
45 static void __btrfs_reset_dev_stats(struct btrfs_device *dev);
46 static void btrfs_dev_stat_print_on_load(struct btrfs_device *device);
48 static DEFINE_MUTEX(uuid_mutex);
49 static LIST_HEAD(fs_uuids);
51 static void lock_chunks(struct btrfs_root *root)
53 mutex_lock(&root->fs_info->chunk_mutex);
56 static void unlock_chunks(struct btrfs_root *root)
58 mutex_unlock(&root->fs_info->chunk_mutex);
61 static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
63 struct btrfs_device *device;
64 WARN_ON(fs_devices->opened);
65 while (!list_empty(&fs_devices->devices)) {
66 device = list_entry(fs_devices->devices.next,
67 struct btrfs_device, dev_list);
68 list_del(&device->dev_list);
69 rcu_string_free(device->name);
75 static void btrfs_kobject_uevent(struct block_device *bdev,
76 enum kobject_action action)
80 ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action);
82 pr_warn("Sending event '%d' to kobject: '%s' (%p): failed\n",
84 kobject_name(&disk_to_dev(bdev->bd_disk)->kobj),
85 &disk_to_dev(bdev->bd_disk)->kobj);
88 void btrfs_cleanup_fs_uuids(void)
90 struct btrfs_fs_devices *fs_devices;
92 while (!list_empty(&fs_uuids)) {
93 fs_devices = list_entry(fs_uuids.next,
94 struct btrfs_fs_devices, list);
95 list_del(&fs_devices->list);
96 free_fs_devices(fs_devices);
100 static noinline struct btrfs_device *__find_device(struct list_head *head,
103 struct btrfs_device *dev;
105 list_for_each_entry(dev, head, dev_list) {
106 if (dev->devid == devid &&
107 (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) {
114 static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid)
116 struct btrfs_fs_devices *fs_devices;
118 list_for_each_entry(fs_devices, &fs_uuids, list) {
119 if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0)
126 btrfs_get_bdev_and_sb(const char *device_path, fmode_t flags, void *holder,
127 int flush, struct block_device **bdev,
128 struct buffer_head **bh)
132 *bdev = blkdev_get_by_path(device_path, flags, holder);
135 ret = PTR_ERR(*bdev);
136 printk(KERN_INFO "btrfs: open %s failed\n", device_path);
141 filemap_write_and_wait((*bdev)->bd_inode->i_mapping);
142 ret = set_blocksize(*bdev, 4096);
144 blkdev_put(*bdev, flags);
147 invalidate_bdev(*bdev);
148 *bh = btrfs_read_dev_super(*bdev);
151 blkdev_put(*bdev, flags);
163 static void requeue_list(struct btrfs_pending_bios *pending_bios,
164 struct bio *head, struct bio *tail)
167 struct bio *old_head;
169 old_head = pending_bios->head;
170 pending_bios->head = head;
171 if (pending_bios->tail)
172 tail->bi_next = old_head;
174 pending_bios->tail = tail;
178 * we try to collect pending bios for a device so we don't get a large
179 * number of procs sending bios down to the same device. This greatly
180 * improves the schedulers ability to collect and merge the bios.
182 * But, it also turns into a long list of bios to process and that is sure
183 * to eventually make the worker thread block. The solution here is to
184 * make some progress and then put this work struct back at the end of
185 * the list if the block device is congested. This way, multiple devices
186 * can make progress from a single worker thread.
188 static noinline void run_scheduled_bios(struct btrfs_device *device)
191 struct backing_dev_info *bdi;
192 struct btrfs_fs_info *fs_info;
193 struct btrfs_pending_bios *pending_bios;
197 unsigned long num_run;
198 unsigned long batch_run = 0;
200 unsigned long last_waited = 0;
202 int sync_pending = 0;
203 struct blk_plug plug;
206 * this function runs all the bios we've collected for
207 * a particular device. We don't want to wander off to
208 * another device without first sending all of these down.
209 * So, setup a plug here and finish it off before we return
211 blk_start_plug(&plug);
213 bdi = blk_get_backing_dev_info(device->bdev);
214 fs_info = device->dev_root->fs_info;
215 limit = btrfs_async_submit_limit(fs_info);
216 limit = limit * 2 / 3;
219 spin_lock(&device->io_lock);
224 /* take all the bios off the list at once and process them
225 * later on (without the lock held). But, remember the
226 * tail and other pointers so the bios can be properly reinserted
227 * into the list if we hit congestion
229 if (!force_reg && device->pending_sync_bios.head) {
230 pending_bios = &device->pending_sync_bios;
233 pending_bios = &device->pending_bios;
237 pending = pending_bios->head;
238 tail = pending_bios->tail;
239 WARN_ON(pending && !tail);
242 * if pending was null this time around, no bios need processing
243 * at all and we can stop. Otherwise it'll loop back up again
244 * and do an additional check so no bios are missed.
246 * device->running_pending is used to synchronize with the
249 if (device->pending_sync_bios.head == NULL &&
250 device->pending_bios.head == NULL) {
252 device->running_pending = 0;
255 device->running_pending = 1;
258 pending_bios->head = NULL;
259 pending_bios->tail = NULL;
261 spin_unlock(&device->io_lock);
266 /* we want to work on both lists, but do more bios on the
267 * sync list than the regular list
270 pending_bios != &device->pending_sync_bios &&
271 device->pending_sync_bios.head) ||
272 (num_run > 64 && pending_bios == &device->pending_sync_bios &&
273 device->pending_bios.head)) {
274 spin_lock(&device->io_lock);
275 requeue_list(pending_bios, pending, tail);
280 pending = pending->bi_next;
283 if (atomic_dec_return(&fs_info->nr_async_bios) < limit &&
284 waitqueue_active(&fs_info->async_submit_wait))
285 wake_up(&fs_info->async_submit_wait);
287 BUG_ON(atomic_read(&cur->bi_cnt) == 0);
290 * if we're doing the sync list, record that our
291 * plug has some sync requests on it
293 * If we're doing the regular list and there are
294 * sync requests sitting around, unplug before
297 if (pending_bios == &device->pending_sync_bios) {
299 } else if (sync_pending) {
300 blk_finish_plug(&plug);
301 blk_start_plug(&plug);
305 btrfsic_submit_bio(cur->bi_rw, cur);
312 * we made progress, there is more work to do and the bdi
313 * is now congested. Back off and let other work structs
316 if (pending && bdi_write_congested(bdi) && batch_run > 8 &&
317 fs_info->fs_devices->open_devices > 1) {
318 struct io_context *ioc;
320 ioc = current->io_context;
323 * the main goal here is that we don't want to
324 * block if we're going to be able to submit
325 * more requests without blocking.
327 * This code does two great things, it pokes into
328 * the elevator code from a filesystem _and_
329 * it makes assumptions about how batching works.
331 if (ioc && ioc->nr_batch_requests > 0 &&
332 time_before(jiffies, ioc->last_waited + HZ/50UL) &&
334 ioc->last_waited == last_waited)) {
336 * we want to go through our batch of
337 * requests and stop. So, we copy out
338 * the ioc->last_waited time and test
339 * against it before looping
341 last_waited = ioc->last_waited;
346 spin_lock(&device->io_lock);
347 requeue_list(pending_bios, pending, tail);
348 device->running_pending = 1;
350 spin_unlock(&device->io_lock);
351 btrfs_requeue_work(&device->work);
354 /* unplug every 64 requests just for good measure */
355 if (batch_run % 64 == 0) {
356 blk_finish_plug(&plug);
357 blk_start_plug(&plug);
366 spin_lock(&device->io_lock);
367 if (device->pending_bios.head || device->pending_sync_bios.head)
369 spin_unlock(&device->io_lock);
372 blk_finish_plug(&plug);
375 static void pending_bios_fn(struct btrfs_work *work)
377 struct btrfs_device *device;
379 device = container_of(work, struct btrfs_device, work);
380 run_scheduled_bios(device);
383 static noinline int device_list_add(const char *path,
384 struct btrfs_super_block *disk_super,
385 u64 devid, struct btrfs_fs_devices **fs_devices_ret)
387 struct btrfs_device *device;
388 struct btrfs_fs_devices *fs_devices;
389 struct rcu_string *name;
390 u64 found_transid = btrfs_super_generation(disk_super);
392 fs_devices = find_fsid(disk_super->fsid);
394 fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS);
397 INIT_LIST_HEAD(&fs_devices->devices);
398 INIT_LIST_HEAD(&fs_devices->alloc_list);
399 list_add(&fs_devices->list, &fs_uuids);
400 memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE);
401 fs_devices->latest_devid = devid;
402 fs_devices->latest_trans = found_transid;
403 mutex_init(&fs_devices->device_list_mutex);
406 device = __find_device(&fs_devices->devices, devid,
407 disk_super->dev_item.uuid);
410 if (fs_devices->opened)
413 device = kzalloc(sizeof(*device), GFP_NOFS);
415 /* we can safely leave the fs_devices entry around */
418 device->devid = devid;
419 device->dev_stats_valid = 0;
420 device->work.func = pending_bios_fn;
421 memcpy(device->uuid, disk_super->dev_item.uuid,
423 spin_lock_init(&device->io_lock);
425 name = rcu_string_strdup(path, GFP_NOFS);
430 rcu_assign_pointer(device->name, name);
431 INIT_LIST_HEAD(&device->dev_alloc_list);
433 /* init readahead state */
434 spin_lock_init(&device->reada_lock);
435 device->reada_curr_zone = NULL;
436 atomic_set(&device->reada_in_flight, 0);
437 device->reada_next = 0;
438 INIT_RADIX_TREE(&device->reada_zones, GFP_NOFS & ~__GFP_WAIT);
439 INIT_RADIX_TREE(&device->reada_extents, GFP_NOFS & ~__GFP_WAIT);
441 mutex_lock(&fs_devices->device_list_mutex);
442 list_add_rcu(&device->dev_list, &fs_devices->devices);
443 mutex_unlock(&fs_devices->device_list_mutex);
445 device->fs_devices = fs_devices;
446 fs_devices->num_devices++;
447 } else if (!device->name || strcmp(device->name->str, path)) {
448 name = rcu_string_strdup(path, GFP_NOFS);
451 rcu_string_free(device->name);
452 rcu_assign_pointer(device->name, name);
453 if (device->missing) {
454 fs_devices->missing_devices--;
459 if (found_transid > fs_devices->latest_trans) {
460 fs_devices->latest_devid = devid;
461 fs_devices->latest_trans = found_transid;
463 *fs_devices_ret = fs_devices;
467 static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig)
469 struct btrfs_fs_devices *fs_devices;
470 struct btrfs_device *device;
471 struct btrfs_device *orig_dev;
473 fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS);
475 return ERR_PTR(-ENOMEM);
477 INIT_LIST_HEAD(&fs_devices->devices);
478 INIT_LIST_HEAD(&fs_devices->alloc_list);
479 INIT_LIST_HEAD(&fs_devices->list);
480 mutex_init(&fs_devices->device_list_mutex);
481 fs_devices->latest_devid = orig->latest_devid;
482 fs_devices->latest_trans = orig->latest_trans;
483 fs_devices->total_devices = orig->total_devices;
484 memcpy(fs_devices->fsid, orig->fsid, sizeof(fs_devices->fsid));
486 /* We have held the volume lock, it is safe to get the devices. */
487 list_for_each_entry(orig_dev, &orig->devices, dev_list) {
488 struct rcu_string *name;
490 device = kzalloc(sizeof(*device), GFP_NOFS);
495 * This is ok to do without rcu read locked because we hold the
496 * uuid mutex so nothing we touch in here is going to disappear.
498 name = rcu_string_strdup(orig_dev->name->str, GFP_NOFS);
503 rcu_assign_pointer(device->name, name);
505 device->devid = orig_dev->devid;
506 device->work.func = pending_bios_fn;
507 memcpy(device->uuid, orig_dev->uuid, sizeof(device->uuid));
508 spin_lock_init(&device->io_lock);
509 INIT_LIST_HEAD(&device->dev_list);
510 INIT_LIST_HEAD(&device->dev_alloc_list);
512 list_add(&device->dev_list, &fs_devices->devices);
513 device->fs_devices = fs_devices;
514 fs_devices->num_devices++;
518 free_fs_devices(fs_devices);
519 return ERR_PTR(-ENOMEM);
522 void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
523 struct btrfs_fs_devices *fs_devices, int step)
525 struct btrfs_device *device, *next;
527 struct block_device *latest_bdev = NULL;
528 u64 latest_devid = 0;
529 u64 latest_transid = 0;
531 mutex_lock(&uuid_mutex);
533 /* This is the initialized path, it is safe to release the devices. */
534 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
535 if (device->in_fs_metadata) {
536 if (!device->is_tgtdev_for_dev_replace &&
538 device->generation > latest_transid)) {
539 latest_devid = device->devid;
540 latest_transid = device->generation;
541 latest_bdev = device->bdev;
546 if (device->devid == BTRFS_DEV_REPLACE_DEVID) {
548 * In the first step, keep the device which has
549 * the correct fsid and the devid that is used
550 * for the dev_replace procedure.
551 * In the second step, the dev_replace state is
552 * read from the device tree and it is known
553 * whether the procedure is really active or
554 * not, which means whether this device is
555 * used or whether it should be removed.
557 if (step == 0 || device->is_tgtdev_for_dev_replace) {
562 blkdev_put(device->bdev, device->mode);
564 fs_devices->open_devices--;
566 if (device->writeable) {
567 list_del_init(&device->dev_alloc_list);
568 device->writeable = 0;
569 if (!device->is_tgtdev_for_dev_replace)
570 fs_devices->rw_devices--;
572 list_del_init(&device->dev_list);
573 fs_devices->num_devices--;
574 rcu_string_free(device->name);
578 if (fs_devices->seed) {
579 fs_devices = fs_devices->seed;
583 fs_devices->latest_bdev = latest_bdev;
584 fs_devices->latest_devid = latest_devid;
585 fs_devices->latest_trans = latest_transid;
587 mutex_unlock(&uuid_mutex);
590 static void __free_device(struct work_struct *work)
592 struct btrfs_device *device;
594 device = container_of(work, struct btrfs_device, rcu_work);
597 blkdev_put(device->bdev, device->mode);
599 rcu_string_free(device->name);
603 static void free_device(struct rcu_head *head)
605 struct btrfs_device *device;
607 device = container_of(head, struct btrfs_device, rcu);
609 INIT_WORK(&device->rcu_work, __free_device);
610 schedule_work(&device->rcu_work);
613 static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
615 struct btrfs_device *device;
617 if (--fs_devices->opened > 0)
620 mutex_lock(&fs_devices->device_list_mutex);
621 list_for_each_entry(device, &fs_devices->devices, dev_list) {
622 struct btrfs_device *new_device;
623 struct rcu_string *name;
626 fs_devices->open_devices--;
628 if (device->writeable && !device->is_tgtdev_for_dev_replace) {
629 list_del_init(&device->dev_alloc_list);
630 fs_devices->rw_devices--;
633 if (device->can_discard)
634 fs_devices->num_can_discard--;
636 new_device = kmalloc(sizeof(*new_device), GFP_NOFS);
637 BUG_ON(!new_device); /* -ENOMEM */
638 memcpy(new_device, device, sizeof(*new_device));
640 /* Safe because we are under uuid_mutex */
642 name = rcu_string_strdup(device->name->str, GFP_NOFS);
643 BUG_ON(device->name && !name); /* -ENOMEM */
644 rcu_assign_pointer(new_device->name, name);
646 new_device->bdev = NULL;
647 new_device->writeable = 0;
648 new_device->in_fs_metadata = 0;
649 new_device->can_discard = 0;
650 list_replace_rcu(&device->dev_list, &new_device->dev_list);
652 call_rcu(&device->rcu, free_device);
654 mutex_unlock(&fs_devices->device_list_mutex);
656 WARN_ON(fs_devices->open_devices);
657 WARN_ON(fs_devices->rw_devices);
658 fs_devices->opened = 0;
659 fs_devices->seeding = 0;
664 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
666 struct btrfs_fs_devices *seed_devices = NULL;
669 mutex_lock(&uuid_mutex);
670 ret = __btrfs_close_devices(fs_devices);
671 if (!fs_devices->opened) {
672 seed_devices = fs_devices->seed;
673 fs_devices->seed = NULL;
675 mutex_unlock(&uuid_mutex);
677 while (seed_devices) {
678 fs_devices = seed_devices;
679 seed_devices = fs_devices->seed;
680 __btrfs_close_devices(fs_devices);
681 free_fs_devices(fs_devices);
686 static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
687 fmode_t flags, void *holder)
689 struct request_queue *q;
690 struct block_device *bdev;
691 struct list_head *head = &fs_devices->devices;
692 struct btrfs_device *device;
693 struct block_device *latest_bdev = NULL;
694 struct buffer_head *bh;
695 struct btrfs_super_block *disk_super;
696 u64 latest_devid = 0;
697 u64 latest_transid = 0;
704 list_for_each_entry(device, head, dev_list) {
710 ret = btrfs_get_bdev_and_sb(device->name->str, flags, holder, 1,
715 disk_super = (struct btrfs_super_block *)bh->b_data;
716 devid = btrfs_stack_device_id(&disk_super->dev_item);
717 if (devid != device->devid)
720 if (memcmp(device->uuid, disk_super->dev_item.uuid,
724 device->generation = btrfs_super_generation(disk_super);
725 if (!latest_transid || device->generation > latest_transid) {
726 latest_devid = devid;
727 latest_transid = device->generation;
731 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) {
732 device->writeable = 0;
734 device->writeable = !bdev_read_only(bdev);
738 q = bdev_get_queue(bdev);
739 if (blk_queue_discard(q)) {
740 device->can_discard = 1;
741 fs_devices->num_can_discard++;
745 device->in_fs_metadata = 0;
746 device->mode = flags;
748 if (!blk_queue_nonrot(bdev_get_queue(bdev)))
749 fs_devices->rotating = 1;
751 fs_devices->open_devices++;
752 if (device->writeable && !device->is_tgtdev_for_dev_replace) {
753 fs_devices->rw_devices++;
754 list_add(&device->dev_alloc_list,
755 &fs_devices->alloc_list);
762 blkdev_put(bdev, flags);
765 if (fs_devices->open_devices == 0) {
769 fs_devices->seeding = seeding;
770 fs_devices->opened = 1;
771 fs_devices->latest_bdev = latest_bdev;
772 fs_devices->latest_devid = latest_devid;
773 fs_devices->latest_trans = latest_transid;
774 fs_devices->total_rw_bytes = 0;
779 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
780 fmode_t flags, void *holder)
784 mutex_lock(&uuid_mutex);
785 if (fs_devices->opened) {
786 fs_devices->opened++;
789 ret = __btrfs_open_devices(fs_devices, flags, holder);
791 mutex_unlock(&uuid_mutex);
795 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
796 struct btrfs_fs_devices **fs_devices_ret)
798 struct btrfs_super_block *disk_super;
799 struct block_device *bdev;
800 struct buffer_head *bh;
807 mutex_lock(&uuid_mutex);
808 ret = btrfs_get_bdev_and_sb(path, flags, holder, 0, &bdev, &bh);
811 disk_super = (struct btrfs_super_block *)bh->b_data;
812 devid = btrfs_stack_device_id(&disk_super->dev_item);
813 transid = btrfs_super_generation(disk_super);
814 total_devices = btrfs_super_num_devices(disk_super);
815 if (disk_super->label[0]) {
816 if (disk_super->label[BTRFS_LABEL_SIZE - 1])
817 disk_super->label[BTRFS_LABEL_SIZE - 1] = '\0';
818 printk(KERN_INFO "device label %s ", disk_super->label);
820 printk(KERN_INFO "device fsid %pU ", disk_super->fsid);
822 printk(KERN_CONT "devid %llu transid %llu %s\n",
823 (unsigned long long)devid, (unsigned long long)transid, path);
824 ret = device_list_add(path, disk_super, devid, fs_devices_ret);
825 if (!ret && fs_devices_ret)
826 (*fs_devices_ret)->total_devices = total_devices;
828 blkdev_put(bdev, flags);
830 mutex_unlock(&uuid_mutex);
834 /* helper to account the used device space in the range */
835 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
836 u64 end, u64 *length)
838 struct btrfs_key key;
839 struct btrfs_root *root = device->dev_root;
840 struct btrfs_dev_extent *dev_extent;
841 struct btrfs_path *path;
845 struct extent_buffer *l;
849 if (start >= device->total_bytes || device->is_tgtdev_for_dev_replace)
852 path = btrfs_alloc_path();
857 key.objectid = device->devid;
859 key.type = BTRFS_DEV_EXTENT_KEY;
861 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
865 ret = btrfs_previous_item(root, path, key.objectid, key.type);
872 slot = path->slots[0];
873 if (slot >= btrfs_header_nritems(l)) {
874 ret = btrfs_next_leaf(root, path);
882 btrfs_item_key_to_cpu(l, &key, slot);
884 if (key.objectid < device->devid)
887 if (key.objectid > device->devid)
890 if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY)
893 dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
894 extent_end = key.offset + btrfs_dev_extent_length(l,
896 if (key.offset <= start && extent_end > end) {
897 *length = end - start + 1;
899 } else if (key.offset <= start && extent_end > start)
900 *length += extent_end - start;
901 else if (key.offset > start && extent_end <= end)
902 *length += extent_end - key.offset;
903 else if (key.offset > start && key.offset <= end) {
904 *length += end - key.offset + 1;
906 } else if (key.offset > end)
914 btrfs_free_path(path);
919 * find_free_dev_extent - find free space in the specified device
920 * @device: the device which we search the free space in
921 * @num_bytes: the size of the free space that we need
922 * @start: store the start of the free space.
923 * @len: the size of the free space. that we find, or the size of the max
924 * free space if we don't find suitable free space
926 * this uses a pretty simple search, the expectation is that it is
927 * called very infrequently and that a given device has a small number
930 * @start is used to store the start of the free space if we find. But if we
931 * don't find suitable free space, it will be used to store the start position
932 * of the max free space.
934 * @len is used to store the size of the free space that we find.
935 * But if we don't find suitable free space, it is used to store the size of
936 * the max free space.
938 int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
939 u64 *start, u64 *len)
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;
950 u64 search_end = device->total_bytes;
953 struct extent_buffer *l;
955 /* FIXME use last free of some kind */
957 /* we don't want to overwrite the superblock on the drive,
958 * so we make sure to start at an offset of at least 1MB
960 search_start = max(root->fs_info->alloc_start, 1024ull * 1024);
962 max_hole_start = search_start;
966 if (search_start >= search_end || device->is_tgtdev_for_dev_replace) {
971 path = btrfs_alloc_path();
978 key.objectid = device->devid;
979 key.offset = search_start;
980 key.type = BTRFS_DEV_EXTENT_KEY;
982 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
986 ret = btrfs_previous_item(root, path, key.objectid, key.type);
993 slot = path->slots[0];
994 if (slot >= btrfs_header_nritems(l)) {
995 ret = btrfs_next_leaf(root, path);
1003 btrfs_item_key_to_cpu(l, &key, slot);
1005 if (key.objectid < device->devid)
1008 if (key.objectid > device->devid)
1011 if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY)
1014 if (key.offset > search_start) {
1015 hole_size = key.offset - search_start;
1017 if (hole_size > max_hole_size) {
1018 max_hole_start = search_start;
1019 max_hole_size = hole_size;
1023 * If this free space is greater than which we need,
1024 * it must be the max free space that we have found
1025 * until now, so max_hole_start must point to the start
1026 * of this free space and the length of this free space
1027 * is stored in max_hole_size. Thus, we return
1028 * max_hole_start and max_hole_size and go back to the
1031 if (hole_size >= num_bytes) {
1037 dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
1038 extent_end = key.offset + btrfs_dev_extent_length(l,
1040 if (extent_end > search_start)
1041 search_start = extent_end;
1048 * At this point, search_start should be the end of
1049 * allocated dev extents, and when shrinking the device,
1050 * search_end may be smaller than search_start.
1052 if (search_end > search_start)
1053 hole_size = search_end - search_start;
1055 if (hole_size > max_hole_size) {
1056 max_hole_start = search_start;
1057 max_hole_size = hole_size;
1061 if (hole_size < num_bytes)
1067 btrfs_free_path(path);
1069 *start = max_hole_start;
1071 *len = max_hole_size;
1075 static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans,
1076 struct btrfs_device *device,
1080 struct btrfs_path *path;
1081 struct btrfs_root *root = device->dev_root;
1082 struct btrfs_key key;
1083 struct btrfs_key found_key;
1084 struct extent_buffer *leaf = NULL;
1085 struct btrfs_dev_extent *extent = NULL;
1087 path = btrfs_alloc_path();
1091 key.objectid = device->devid;
1093 key.type = BTRFS_DEV_EXTENT_KEY;
1095 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
1097 ret = btrfs_previous_item(root, path, key.objectid,
1098 BTRFS_DEV_EXTENT_KEY);
1101 leaf = path->nodes[0];
1102 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1103 extent = btrfs_item_ptr(leaf, path->slots[0],
1104 struct btrfs_dev_extent);
1105 BUG_ON(found_key.offset > start || found_key.offset +
1106 btrfs_dev_extent_length(leaf, extent) < start);
1108 btrfs_release_path(path);
1110 } else if (ret == 0) {
1111 leaf = path->nodes[0];
1112 extent = btrfs_item_ptr(leaf, path->slots[0],
1113 struct btrfs_dev_extent);
1115 btrfs_error(root->fs_info, ret, "Slot search failed");
1119 if (device->bytes_used > 0) {
1120 u64 len = btrfs_dev_extent_length(leaf, extent);
1121 device->bytes_used -= len;
1122 spin_lock(&root->fs_info->free_chunk_lock);
1123 root->fs_info->free_chunk_space += len;
1124 spin_unlock(&root->fs_info->free_chunk_lock);
1126 ret = btrfs_del_item(trans, root, path);
1128 btrfs_error(root->fs_info, ret,
1129 "Failed to remove dev extent item");
1132 btrfs_free_path(path);
1136 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
1137 struct btrfs_device *device,
1138 u64 chunk_tree, u64 chunk_objectid,
1139 u64 chunk_offset, u64 start, u64 num_bytes)
1142 struct btrfs_path *path;
1143 struct btrfs_root *root = device->dev_root;
1144 struct btrfs_dev_extent *extent;
1145 struct extent_buffer *leaf;
1146 struct btrfs_key key;
1148 WARN_ON(!device->in_fs_metadata);
1149 WARN_ON(device->is_tgtdev_for_dev_replace);
1150 path = btrfs_alloc_path();
1154 key.objectid = device->devid;
1156 key.type = BTRFS_DEV_EXTENT_KEY;
1157 ret = btrfs_insert_empty_item(trans, root, path, &key,
1162 leaf = path->nodes[0];
1163 extent = btrfs_item_ptr(leaf, path->slots[0],
1164 struct btrfs_dev_extent);
1165 btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree);
1166 btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid);
1167 btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset);
1169 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
1170 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent),
1173 btrfs_set_dev_extent_length(leaf, extent, num_bytes);
1174 btrfs_mark_buffer_dirty(leaf);
1176 btrfs_free_path(path);
1180 static noinline int find_next_chunk(struct btrfs_root *root,
1181 u64 objectid, u64 *offset)
1183 struct btrfs_path *path;
1185 struct btrfs_key key;
1186 struct btrfs_chunk *chunk;
1187 struct btrfs_key found_key;
1189 path = btrfs_alloc_path();
1193 key.objectid = objectid;
1194 key.offset = (u64)-1;
1195 key.type = BTRFS_CHUNK_ITEM_KEY;
1197 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1201 BUG_ON(ret == 0); /* Corruption */
1203 ret = btrfs_previous_item(root, path, 0, BTRFS_CHUNK_ITEM_KEY);
1207 btrfs_item_key_to_cpu(path->nodes[0], &found_key,
1209 if (found_key.objectid != objectid)
1212 chunk = btrfs_item_ptr(path->nodes[0], path->slots[0],
1213 struct btrfs_chunk);
1214 *offset = found_key.offset +
1215 btrfs_chunk_length(path->nodes[0], chunk);
1220 btrfs_free_path(path);
1224 static noinline int find_next_devid(struct btrfs_root *root, u64 *objectid)
1227 struct btrfs_key key;
1228 struct btrfs_key found_key;
1229 struct btrfs_path *path;
1231 root = root->fs_info->chunk_root;
1233 path = btrfs_alloc_path();
1237 key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
1238 key.type = BTRFS_DEV_ITEM_KEY;
1239 key.offset = (u64)-1;
1241 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1245 BUG_ON(ret == 0); /* Corruption */
1247 ret = btrfs_previous_item(root, path, BTRFS_DEV_ITEMS_OBJECTID,
1248 BTRFS_DEV_ITEM_KEY);
1252 btrfs_item_key_to_cpu(path->nodes[0], &found_key,
1254 *objectid = found_key.offset + 1;
1258 btrfs_free_path(path);
1263 * the device information is stored in the chunk root
1264 * the btrfs_device struct should be fully filled in
1266 int btrfs_add_device(struct btrfs_trans_handle *trans,
1267 struct btrfs_root *root,
1268 struct btrfs_device *device)
1271 struct btrfs_path *path;
1272 struct btrfs_dev_item *dev_item;
1273 struct extent_buffer *leaf;
1274 struct btrfs_key key;
1277 root = root->fs_info->chunk_root;
1279 path = btrfs_alloc_path();
1283 key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
1284 key.type = BTRFS_DEV_ITEM_KEY;
1285 key.offset = device->devid;
1287 ret = btrfs_insert_empty_item(trans, root, path, &key,
1292 leaf = path->nodes[0];
1293 dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item);
1295 btrfs_set_device_id(leaf, dev_item, device->devid);
1296 btrfs_set_device_generation(leaf, dev_item, 0);
1297 btrfs_set_device_type(leaf, dev_item, device->type);
1298 btrfs_set_device_io_align(leaf, dev_item, device->io_align);
1299 btrfs_set_device_io_width(leaf, dev_item, device->io_width);
1300 btrfs_set_device_sector_size(leaf, dev_item, device->sector_size);
1301 btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes);
1302 btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used);
1303 btrfs_set_device_group(leaf, dev_item, 0);
1304 btrfs_set_device_seek_speed(leaf, dev_item, 0);
1305 btrfs_set_device_bandwidth(leaf, dev_item, 0);
1306 btrfs_set_device_start_offset(leaf, dev_item, 0);
1308 ptr = (unsigned long)btrfs_device_uuid(dev_item);
1309 write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE);
1310 ptr = (unsigned long)btrfs_device_fsid(dev_item);
1311 write_extent_buffer(leaf, root->fs_info->fsid, ptr, BTRFS_UUID_SIZE);
1312 btrfs_mark_buffer_dirty(leaf);
1316 btrfs_free_path(path);
1320 static int btrfs_rm_dev_item(struct btrfs_root *root,
1321 struct btrfs_device *device)
1324 struct btrfs_path *path;
1325 struct btrfs_key key;
1326 struct btrfs_trans_handle *trans;
1328 root = root->fs_info->chunk_root;
1330 path = btrfs_alloc_path();
1334 trans = btrfs_start_transaction(root, 0);
1335 if (IS_ERR(trans)) {
1336 btrfs_free_path(path);
1337 return PTR_ERR(trans);
1339 key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
1340 key.type = BTRFS_DEV_ITEM_KEY;
1341 key.offset = device->devid;
1344 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
1353 ret = btrfs_del_item(trans, root, path);
1357 btrfs_free_path(path);
1358 unlock_chunks(root);
1359 btrfs_commit_transaction(trans, root);
1363 int btrfs_rm_device(struct btrfs_root *root, char *device_path)
1365 struct btrfs_device *device;
1366 struct btrfs_device *next_device;
1367 struct block_device *bdev;
1368 struct buffer_head *bh = NULL;
1369 struct btrfs_super_block *disk_super;
1370 struct btrfs_fs_devices *cur_devices;
1376 bool clear_super = false;
1378 mutex_lock(&uuid_mutex);
1380 all_avail = root->fs_info->avail_data_alloc_bits |
1381 root->fs_info->avail_system_alloc_bits |
1382 root->fs_info->avail_metadata_alloc_bits;
1384 num_devices = root->fs_info->fs_devices->num_devices;
1385 btrfs_dev_replace_lock(&root->fs_info->dev_replace);
1386 if (btrfs_dev_replace_is_ongoing(&root->fs_info->dev_replace)) {
1387 WARN_ON(num_devices < 1);
1390 btrfs_dev_replace_unlock(&root->fs_info->dev_replace);
1392 if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) && num_devices <= 4) {
1393 printk(KERN_ERR "btrfs: unable to go below four devices "
1399 if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) && num_devices <= 2) {
1400 printk(KERN_ERR "btrfs: unable to go below two "
1401 "devices on raid1\n");
1406 if (strcmp(device_path, "missing") == 0) {
1407 struct list_head *devices;
1408 struct btrfs_device *tmp;
1411 devices = &root->fs_info->fs_devices->devices;
1413 * It is safe to read the devices since the volume_mutex
1416 list_for_each_entry(tmp, devices, dev_list) {
1417 if (tmp->in_fs_metadata &&
1418 !tmp->is_tgtdev_for_dev_replace &&
1428 printk(KERN_ERR "btrfs: no missing devices found to "
1433 ret = btrfs_get_bdev_and_sb(device_path,
1434 FMODE_WRITE | FMODE_EXCL,
1435 root->fs_info->bdev_holder, 0,
1439 disk_super = (struct btrfs_super_block *)bh->b_data;
1440 devid = btrfs_stack_device_id(&disk_super->dev_item);
1441 dev_uuid = disk_super->dev_item.uuid;
1442 device = btrfs_find_device(root->fs_info, devid, dev_uuid,
1450 if (device->is_tgtdev_for_dev_replace) {
1451 pr_err("btrfs: unable to remove the dev_replace target dev\n");
1456 if (device->writeable && root->fs_info->fs_devices->rw_devices == 1) {
1457 printk(KERN_ERR "btrfs: unable to remove the only writeable "
1463 if (device->writeable) {
1465 list_del_init(&device->dev_alloc_list);
1466 unlock_chunks(root);
1467 root->fs_info->fs_devices->rw_devices--;
1471 ret = btrfs_shrink_device(device, 0);
1476 * TODO: the superblock still includes this device in its num_devices
1477 * counter although write_all_supers() is not locked out. This
1478 * could give a filesystem state which requires a degraded mount.
1480 ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device);
1484 spin_lock(&root->fs_info->free_chunk_lock);
1485 root->fs_info->free_chunk_space = device->total_bytes -
1487 spin_unlock(&root->fs_info->free_chunk_lock);
1489 device->in_fs_metadata = 0;
1490 btrfs_scrub_cancel_dev(root->fs_info, device);
1493 * the device list mutex makes sure that we don't change
1494 * the device list while someone else is writing out all
1495 * the device supers.
1498 cur_devices = device->fs_devices;
1499 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
1500 list_del_rcu(&device->dev_list);
1502 device->fs_devices->num_devices--;
1503 device->fs_devices->total_devices--;
1505 if (device->missing)
1506 root->fs_info->fs_devices->missing_devices--;
1508 next_device = list_entry(root->fs_info->fs_devices->devices.next,
1509 struct btrfs_device, dev_list);
1510 if (device->bdev == root->fs_info->sb->s_bdev)
1511 root->fs_info->sb->s_bdev = next_device->bdev;
1512 if (device->bdev == root->fs_info->fs_devices->latest_bdev)
1513 root->fs_info->fs_devices->latest_bdev = next_device->bdev;
1516 device->fs_devices->open_devices--;
1518 call_rcu(&device->rcu, free_device);
1519 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
1521 num_devices = btrfs_super_num_devices(root->fs_info->super_copy) - 1;
1522 btrfs_set_super_num_devices(root->fs_info->super_copy, num_devices);
1524 if (cur_devices->open_devices == 0) {
1525 struct btrfs_fs_devices *fs_devices;
1526 fs_devices = root->fs_info->fs_devices;
1527 while (fs_devices) {
1528 if (fs_devices->seed == cur_devices)
1530 fs_devices = fs_devices->seed;
1532 fs_devices->seed = cur_devices->seed;
1533 cur_devices->seed = NULL;
1535 __btrfs_close_devices(cur_devices);
1536 unlock_chunks(root);
1537 free_fs_devices(cur_devices);
1540 root->fs_info->num_tolerated_disk_barrier_failures =
1541 btrfs_calc_num_tolerated_disk_barrier_failures(root->fs_info);
1544 * at this point, the device is zero sized. We want to
1545 * remove it from the devices list and zero out the old super
1547 if (clear_super && disk_super) {
1548 /* make sure this device isn't detected as part of
1551 memset(&disk_super->magic, 0, sizeof(disk_super->magic));
1552 set_buffer_dirty(bh);
1553 sync_dirty_buffer(bh);
1558 /* Notify udev that device has changed */
1559 btrfs_kobject_uevent(bdev, KOBJ_CHANGE);
1564 blkdev_put(bdev, FMODE_READ | FMODE_EXCL);
1566 mutex_unlock(&uuid_mutex);
1569 if (device->writeable) {
1571 list_add(&device->dev_alloc_list,
1572 &root->fs_info->fs_devices->alloc_list);
1573 unlock_chunks(root);
1574 root->fs_info->fs_devices->rw_devices++;
1579 void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
1580 struct btrfs_device *srcdev)
1582 WARN_ON(!mutex_is_locked(&fs_info->fs_devices->device_list_mutex));
1583 list_del_rcu(&srcdev->dev_list);
1584 list_del_rcu(&srcdev->dev_alloc_list);
1585 fs_info->fs_devices->num_devices--;
1586 if (srcdev->missing) {
1587 fs_info->fs_devices->missing_devices--;
1588 fs_info->fs_devices->rw_devices++;
1590 if (srcdev->can_discard)
1591 fs_info->fs_devices->num_can_discard--;
1593 fs_info->fs_devices->open_devices--;
1595 call_rcu(&srcdev->rcu, free_device);
1598 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
1599 struct btrfs_device *tgtdev)
1601 struct btrfs_device *next_device;
1604 mutex_lock(&fs_info->fs_devices->device_list_mutex);
1606 btrfs_scratch_superblock(tgtdev);
1607 fs_info->fs_devices->open_devices--;
1609 fs_info->fs_devices->num_devices--;
1610 if (tgtdev->can_discard)
1611 fs_info->fs_devices->num_can_discard++;
1613 next_device = list_entry(fs_info->fs_devices->devices.next,
1614 struct btrfs_device, dev_list);
1615 if (tgtdev->bdev == fs_info->sb->s_bdev)
1616 fs_info->sb->s_bdev = next_device->bdev;
1617 if (tgtdev->bdev == fs_info->fs_devices->latest_bdev)
1618 fs_info->fs_devices->latest_bdev = next_device->bdev;
1619 list_del_rcu(&tgtdev->dev_list);
1621 call_rcu(&tgtdev->rcu, free_device);
1623 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
1626 int btrfs_find_device_by_path(struct btrfs_root *root, char *device_path,
1627 struct btrfs_device **device)
1630 struct btrfs_super_block *disk_super;
1633 struct block_device *bdev;
1634 struct buffer_head *bh;
1637 ret = btrfs_get_bdev_and_sb(device_path, FMODE_READ,
1638 root->fs_info->bdev_holder, 0, &bdev, &bh);
1641 disk_super = (struct btrfs_super_block *)bh->b_data;
1642 devid = btrfs_stack_device_id(&disk_super->dev_item);
1643 dev_uuid = disk_super->dev_item.uuid;
1644 *device = btrfs_find_device(root->fs_info, devid, dev_uuid,
1649 blkdev_put(bdev, FMODE_READ);
1653 int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
1655 struct btrfs_device **device)
1658 if (strcmp(device_path, "missing") == 0) {
1659 struct list_head *devices;
1660 struct btrfs_device *tmp;
1662 devices = &root->fs_info->fs_devices->devices;
1664 * It is safe to read the devices since the volume_mutex
1665 * is held by the caller.
1667 list_for_each_entry(tmp, devices, dev_list) {
1668 if (tmp->in_fs_metadata && !tmp->bdev) {
1675 pr_err("btrfs: no missing device found\n");
1681 return btrfs_find_device_by_path(root, device_path, device);
1686 * does all the dirty work required for changing file system's UUID.
1688 static int btrfs_prepare_sprout(struct btrfs_root *root)
1690 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
1691 struct btrfs_fs_devices *old_devices;
1692 struct btrfs_fs_devices *seed_devices;
1693 struct btrfs_super_block *disk_super = root->fs_info->super_copy;
1694 struct btrfs_device *device;
1697 BUG_ON(!mutex_is_locked(&uuid_mutex));
1698 if (!fs_devices->seeding)
1701 seed_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS);
1705 old_devices = clone_fs_devices(fs_devices);
1706 if (IS_ERR(old_devices)) {
1707 kfree(seed_devices);
1708 return PTR_ERR(old_devices);
1711 list_add(&old_devices->list, &fs_uuids);
1713 memcpy(seed_devices, fs_devices, sizeof(*seed_devices));
1714 seed_devices->opened = 1;
1715 INIT_LIST_HEAD(&seed_devices->devices);
1716 INIT_LIST_HEAD(&seed_devices->alloc_list);
1717 mutex_init(&seed_devices->device_list_mutex);
1719 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
1720 list_splice_init_rcu(&fs_devices->devices, &seed_devices->devices,
1722 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
1724 list_splice_init(&fs_devices->alloc_list, &seed_devices->alloc_list);
1725 list_for_each_entry(device, &seed_devices->devices, dev_list) {
1726 device->fs_devices = seed_devices;
1729 fs_devices->seeding = 0;
1730 fs_devices->num_devices = 0;
1731 fs_devices->open_devices = 0;
1732 fs_devices->total_devices = 0;
1733 fs_devices->seed = seed_devices;
1735 generate_random_uuid(fs_devices->fsid);
1736 memcpy(root->fs_info->fsid, fs_devices->fsid, BTRFS_FSID_SIZE);
1737 memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE);
1738 super_flags = btrfs_super_flags(disk_super) &
1739 ~BTRFS_SUPER_FLAG_SEEDING;
1740 btrfs_set_super_flags(disk_super, super_flags);
1746 * strore the expected generation for seed devices in device items.
1748 static int btrfs_finish_sprout(struct btrfs_trans_handle *trans,
1749 struct btrfs_root *root)
1751 struct btrfs_path *path;
1752 struct extent_buffer *leaf;
1753 struct btrfs_dev_item *dev_item;
1754 struct btrfs_device *device;
1755 struct btrfs_key key;
1756 u8 fs_uuid[BTRFS_UUID_SIZE];
1757 u8 dev_uuid[BTRFS_UUID_SIZE];
1761 path = btrfs_alloc_path();
1765 root = root->fs_info->chunk_root;
1766 key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
1768 key.type = BTRFS_DEV_ITEM_KEY;
1771 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
1775 leaf = path->nodes[0];
1777 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
1778 ret = btrfs_next_leaf(root, path);
1783 leaf = path->nodes[0];
1784 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
1785 btrfs_release_path(path);
1789 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
1790 if (key.objectid != BTRFS_DEV_ITEMS_OBJECTID ||
1791 key.type != BTRFS_DEV_ITEM_KEY)
1794 dev_item = btrfs_item_ptr(leaf, path->slots[0],
1795 struct btrfs_dev_item);
1796 devid = btrfs_device_id(leaf, dev_item);
1797 read_extent_buffer(leaf, dev_uuid,
1798 (unsigned long)btrfs_device_uuid(dev_item),
1800 read_extent_buffer(leaf, fs_uuid,
1801 (unsigned long)btrfs_device_fsid(dev_item),
1803 device = btrfs_find_device(root->fs_info, devid, dev_uuid,
1805 BUG_ON(!device); /* Logic error */
1807 if (device->fs_devices->seeding) {
1808 btrfs_set_device_generation(leaf, dev_item,
1809 device->generation);
1810 btrfs_mark_buffer_dirty(leaf);
1818 btrfs_free_path(path);
1822 int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
1824 struct request_queue *q;
1825 struct btrfs_trans_handle *trans;
1826 struct btrfs_device *device;
1827 struct block_device *bdev;
1828 struct list_head *devices;
1829 struct super_block *sb = root->fs_info->sb;
1830 struct rcu_string *name;
1832 int seeding_dev = 0;
1835 if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding)
1838 bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL,
1839 root->fs_info->bdev_holder);
1841 return PTR_ERR(bdev);
1843 if (root->fs_info->fs_devices->seeding) {
1845 down_write(&sb->s_umount);
1846 mutex_lock(&uuid_mutex);
1849 filemap_write_and_wait(bdev->bd_inode->i_mapping);
1851 devices = &root->fs_info->fs_devices->devices;
1853 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
1854 list_for_each_entry(device, devices, dev_list) {
1855 if (device->bdev == bdev) {
1858 &root->fs_info->fs_devices->device_list_mutex);
1862 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
1864 device = kzalloc(sizeof(*device), GFP_NOFS);
1866 /* we can safely leave the fs_devices entry around */
1871 name = rcu_string_strdup(device_path, GFP_NOFS);
1877 rcu_assign_pointer(device->name, name);
1879 ret = find_next_devid(root, &device->devid);
1881 rcu_string_free(device->name);
1886 trans = btrfs_start_transaction(root, 0);
1887 if (IS_ERR(trans)) {
1888 rcu_string_free(device->name);
1890 ret = PTR_ERR(trans);
1896 q = bdev_get_queue(bdev);
1897 if (blk_queue_discard(q))
1898 device->can_discard = 1;
1899 device->writeable = 1;
1900 device->work.func = pending_bios_fn;
1901 generate_random_uuid(device->uuid);
1902 spin_lock_init(&device->io_lock);
1903 device->generation = trans->transid;
1904 device->io_width = root->sectorsize;
1905 device->io_align = root->sectorsize;
1906 device->sector_size = root->sectorsize;
1907 device->total_bytes = i_size_read(bdev->bd_inode);
1908 device->disk_total_bytes = device->total_bytes;
1909 device->dev_root = root->fs_info->dev_root;
1910 device->bdev = bdev;
1911 device->in_fs_metadata = 1;
1912 device->is_tgtdev_for_dev_replace = 0;
1913 device->mode = FMODE_EXCL;
1914 set_blocksize(device->bdev, 4096);
1917 sb->s_flags &= ~MS_RDONLY;
1918 ret = btrfs_prepare_sprout(root);
1919 BUG_ON(ret); /* -ENOMEM */
1922 device->fs_devices = root->fs_info->fs_devices;
1924 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
1925 list_add_rcu(&device->dev_list, &root->fs_info->fs_devices->devices);
1926 list_add(&device->dev_alloc_list,
1927 &root->fs_info->fs_devices->alloc_list);
1928 root->fs_info->fs_devices->num_devices++;
1929 root->fs_info->fs_devices->open_devices++;
1930 root->fs_info->fs_devices->rw_devices++;
1931 root->fs_info->fs_devices->total_devices++;
1932 if (device->can_discard)
1933 root->fs_info->fs_devices->num_can_discard++;
1934 root->fs_info->fs_devices->total_rw_bytes += device->total_bytes;
1936 spin_lock(&root->fs_info->free_chunk_lock);
1937 root->fs_info->free_chunk_space += device->total_bytes;
1938 spin_unlock(&root->fs_info->free_chunk_lock);
1940 if (!blk_queue_nonrot(bdev_get_queue(bdev)))
1941 root->fs_info->fs_devices->rotating = 1;
1943 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
1944 btrfs_set_super_total_bytes(root->fs_info->super_copy,
1945 total_bytes + device->total_bytes);
1947 total_bytes = btrfs_super_num_devices(root->fs_info->super_copy);
1948 btrfs_set_super_num_devices(root->fs_info->super_copy,
1950 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
1953 ret = init_first_rw_device(trans, root, device);
1955 btrfs_abort_transaction(trans, root, ret);
1958 ret = btrfs_finish_sprout(trans, root);
1960 btrfs_abort_transaction(trans, root, ret);
1964 ret = btrfs_add_device(trans, root, device);
1966 btrfs_abort_transaction(trans, root, ret);
1972 * we've got more storage, clear any full flags on the space
1975 btrfs_clear_space_info_full(root->fs_info);
1977 unlock_chunks(root);
1978 root->fs_info->num_tolerated_disk_barrier_failures =
1979 btrfs_calc_num_tolerated_disk_barrier_failures(root->fs_info);
1980 ret = btrfs_commit_transaction(trans, root);
1983 mutex_unlock(&uuid_mutex);
1984 up_write(&sb->s_umount);
1986 if (ret) /* transaction commit */
1989 ret = btrfs_relocate_sys_chunks(root);
1991 btrfs_error(root->fs_info, ret,
1992 "Failed to relocate sys chunks after "
1993 "device initialization. This can be fixed "
1994 "using the \"btrfs balance\" command.");
1995 trans = btrfs_attach_transaction(root);
1996 if (IS_ERR(trans)) {
1997 if (PTR_ERR(trans) == -ENOENT)
1999 return PTR_ERR(trans);
2001 ret = btrfs_commit_transaction(trans, root);
2007 unlock_chunks(root);
2008 btrfs_end_transaction(trans, root);
2009 rcu_string_free(device->name);
2012 blkdev_put(bdev, FMODE_EXCL);
2014 mutex_unlock(&uuid_mutex);
2015 up_write(&sb->s_umount);
2020 int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
2021 struct btrfs_device **device_out)
2023 struct request_queue *q;
2024 struct btrfs_device *device;
2025 struct block_device *bdev;
2026 struct btrfs_fs_info *fs_info = root->fs_info;
2027 struct list_head *devices;
2028 struct rcu_string *name;
2032 if (fs_info->fs_devices->seeding)
2035 bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL,
2036 fs_info->bdev_holder);
2038 return PTR_ERR(bdev);
2040 filemap_write_and_wait(bdev->bd_inode->i_mapping);
2042 devices = &fs_info->fs_devices->devices;
2043 list_for_each_entry(device, devices, dev_list) {
2044 if (device->bdev == bdev) {
2050 device = kzalloc(sizeof(*device), GFP_NOFS);
2056 name = rcu_string_strdup(device_path, GFP_NOFS);
2062 rcu_assign_pointer(device->name, name);
2064 q = bdev_get_queue(bdev);
2065 if (blk_queue_discard(q))
2066 device->can_discard = 1;
2067 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
2068 device->writeable = 1;
2069 device->work.func = pending_bios_fn;
2070 generate_random_uuid(device->uuid);
2071 device->devid = BTRFS_DEV_REPLACE_DEVID;
2072 spin_lock_init(&device->io_lock);
2073 device->generation = 0;
2074 device->io_width = root->sectorsize;
2075 device->io_align = root->sectorsize;
2076 device->sector_size = root->sectorsize;
2077 device->total_bytes = i_size_read(bdev->bd_inode);
2078 device->disk_total_bytes = device->total_bytes;
2079 device->dev_root = fs_info->dev_root;
2080 device->bdev = bdev;
2081 device->in_fs_metadata = 1;
2082 device->is_tgtdev_for_dev_replace = 1;
2083 device->mode = FMODE_EXCL;
2084 set_blocksize(device->bdev, 4096);
2085 device->fs_devices = fs_info->fs_devices;
2086 list_add(&device->dev_list, &fs_info->fs_devices->devices);
2087 fs_info->fs_devices->num_devices++;
2088 fs_info->fs_devices->open_devices++;
2089 if (device->can_discard)
2090 fs_info->fs_devices->num_can_discard++;
2091 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
2093 *device_out = device;
2097 blkdev_put(bdev, FMODE_EXCL);
2101 void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
2102 struct btrfs_device *tgtdev)
2104 WARN_ON(fs_info->fs_devices->rw_devices == 0);
2105 tgtdev->io_width = fs_info->dev_root->sectorsize;
2106 tgtdev->io_align = fs_info->dev_root->sectorsize;
2107 tgtdev->sector_size = fs_info->dev_root->sectorsize;
2108 tgtdev->dev_root = fs_info->dev_root;
2109 tgtdev->in_fs_metadata = 1;
2112 static noinline int btrfs_update_device(struct btrfs_trans_handle *trans,
2113 struct btrfs_device *device)
2116 struct btrfs_path *path;
2117 struct btrfs_root *root;
2118 struct btrfs_dev_item *dev_item;
2119 struct extent_buffer *leaf;
2120 struct btrfs_key key;
2122 root = device->dev_root->fs_info->chunk_root;
2124 path = btrfs_alloc_path();
2128 key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
2129 key.type = BTRFS_DEV_ITEM_KEY;
2130 key.offset = device->devid;
2132 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
2141 leaf = path->nodes[0];
2142 dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item);
2144 btrfs_set_device_id(leaf, dev_item, device->devid);
2145 btrfs_set_device_type(leaf, dev_item, device->type);
2146 btrfs_set_device_io_align(leaf, dev_item, device->io_align);
2147 btrfs_set_device_io_width(leaf, dev_item, device->io_width);
2148 btrfs_set_device_sector_size(leaf, dev_item, device->sector_size);
2149 btrfs_set_device_total_bytes(leaf, dev_item, device->disk_total_bytes);
2150 btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used);
2151 btrfs_mark_buffer_dirty(leaf);
2154 btrfs_free_path(path);
2158 static int __btrfs_grow_device(struct btrfs_trans_handle *trans,
2159 struct btrfs_device *device, u64 new_size)
2161 struct btrfs_super_block *super_copy =
2162 device->dev_root->fs_info->super_copy;
2163 u64 old_total = btrfs_super_total_bytes(super_copy);
2164 u64 diff = new_size - device->total_bytes;
2166 if (!device->writeable)
2168 if (new_size <= device->total_bytes ||
2169 device->is_tgtdev_for_dev_replace)
2172 btrfs_set_super_total_bytes(super_copy, old_total + diff);
2173 device->fs_devices->total_rw_bytes += diff;
2175 device->total_bytes = new_size;
2176 device->disk_total_bytes = new_size;
2177 btrfs_clear_space_info_full(device->dev_root->fs_info);
2179 return btrfs_update_device(trans, device);
2182 int btrfs_grow_device(struct btrfs_trans_handle *trans,
2183 struct btrfs_device *device, u64 new_size)
2186 lock_chunks(device->dev_root);
2187 ret = __btrfs_grow_device(trans, device, new_size);
2188 unlock_chunks(device->dev_root);
2192 static int btrfs_free_chunk(struct btrfs_trans_handle *trans,
2193 struct btrfs_root *root,
2194 u64 chunk_tree, u64 chunk_objectid,
2198 struct btrfs_path *path;
2199 struct btrfs_key key;
2201 root = root->fs_info->chunk_root;
2202 path = btrfs_alloc_path();
2206 key.objectid = chunk_objectid;
2207 key.offset = chunk_offset;
2208 key.type = BTRFS_CHUNK_ITEM_KEY;
2210 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
2213 else if (ret > 0) { /* Logic error or corruption */
2214 btrfs_error(root->fs_info, -ENOENT,
2215 "Failed lookup while freeing chunk.");
2220 ret = btrfs_del_item(trans, root, path);
2222 btrfs_error(root->fs_info, ret,
2223 "Failed to delete chunk item.");
2225 btrfs_free_path(path);
2229 static int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64
2232 struct btrfs_super_block *super_copy = root->fs_info->super_copy;
2233 struct btrfs_disk_key *disk_key;
2234 struct btrfs_chunk *chunk;
2241 struct btrfs_key key;
2243 array_size = btrfs_super_sys_array_size(super_copy);
2245 ptr = super_copy->sys_chunk_array;
2248 while (cur < array_size) {
2249 disk_key = (struct btrfs_disk_key *)ptr;
2250 btrfs_disk_key_to_cpu(&key, disk_key);
2252 len = sizeof(*disk_key);
2254 if (key.type == BTRFS_CHUNK_ITEM_KEY) {
2255 chunk = (struct btrfs_chunk *)(ptr + len);
2256 num_stripes = btrfs_stack_chunk_num_stripes(chunk);
2257 len += btrfs_chunk_item_size(num_stripes);
2262 if (key.objectid == chunk_objectid &&
2263 key.offset == chunk_offset) {
2264 memmove(ptr, ptr + len, array_size - (cur + len));
2266 btrfs_set_super_sys_array_size(super_copy, array_size);
2275 static int btrfs_relocate_chunk(struct btrfs_root *root,
2276 u64 chunk_tree, u64 chunk_objectid,
2279 struct extent_map_tree *em_tree;
2280 struct btrfs_root *extent_root;
2281 struct btrfs_trans_handle *trans;
2282 struct extent_map *em;
2283 struct map_lookup *map;
2287 root = root->fs_info->chunk_root;
2288 extent_root = root->fs_info->extent_root;
2289 em_tree = &root->fs_info->mapping_tree.map_tree;
2291 ret = btrfs_can_relocate(extent_root, chunk_offset);
2295 /* step one, relocate all the extents inside this chunk */
2296 ret = btrfs_relocate_block_group(extent_root, chunk_offset);
2300 trans = btrfs_start_transaction(root, 0);
2301 BUG_ON(IS_ERR(trans));
2306 * step two, delete the device extents and the
2307 * chunk tree entries
2309 read_lock(&em_tree->lock);
2310 em = lookup_extent_mapping(em_tree, chunk_offset, 1);
2311 read_unlock(&em_tree->lock);
2313 BUG_ON(!em || em->start > chunk_offset ||
2314 em->start + em->len < chunk_offset);
2315 map = (struct map_lookup *)em->bdev;
2317 for (i = 0; i < map->num_stripes; i++) {
2318 ret = btrfs_free_dev_extent(trans, map->stripes[i].dev,
2319 map->stripes[i].physical);
2322 if (map->stripes[i].dev) {
2323 ret = btrfs_update_device(trans, map->stripes[i].dev);
2327 ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid,
2332 trace_btrfs_chunk_free(root, map, chunk_offset, em->len);
2334 if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) {
2335 ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset);
2339 ret = btrfs_remove_block_group(trans, extent_root, chunk_offset);
2342 write_lock(&em_tree->lock);
2343 remove_extent_mapping(em_tree, em);
2344 write_unlock(&em_tree->lock);
2349 /* once for the tree */
2350 free_extent_map(em);
2352 free_extent_map(em);
2354 unlock_chunks(root);
2355 btrfs_end_transaction(trans, root);
2359 static int btrfs_relocate_sys_chunks(struct btrfs_root *root)
2361 struct btrfs_root *chunk_root = root->fs_info->chunk_root;
2362 struct btrfs_path *path;
2363 struct extent_buffer *leaf;
2364 struct btrfs_chunk *chunk;
2365 struct btrfs_key key;
2366 struct btrfs_key found_key;
2367 u64 chunk_tree = chunk_root->root_key.objectid;
2369 bool retried = false;
2373 path = btrfs_alloc_path();
2378 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
2379 key.offset = (u64)-1;
2380 key.type = BTRFS_CHUNK_ITEM_KEY;
2383 ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0);
2386 BUG_ON(ret == 0); /* Corruption */
2388 ret = btrfs_previous_item(chunk_root, path, key.objectid,
2395 leaf = path->nodes[0];
2396 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2398 chunk = btrfs_item_ptr(leaf, path->slots[0],
2399 struct btrfs_chunk);
2400 chunk_type = btrfs_chunk_type(leaf, chunk);
2401 btrfs_release_path(path);
2403 if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) {
2404 ret = btrfs_relocate_chunk(chunk_root, chunk_tree,
2413 if (found_key.offset == 0)
2415 key.offset = found_key.offset - 1;
2418 if (failed && !retried) {
2422 } else if (failed && retried) {
2427 btrfs_free_path(path);
2431 static int insert_balance_item(struct btrfs_root *root,
2432 struct btrfs_balance_control *bctl)
2434 struct btrfs_trans_handle *trans;
2435 struct btrfs_balance_item *item;
2436 struct btrfs_disk_balance_args disk_bargs;
2437 struct btrfs_path *path;
2438 struct extent_buffer *leaf;
2439 struct btrfs_key key;
2442 path = btrfs_alloc_path();
2446 trans = btrfs_start_transaction(root, 0);
2447 if (IS_ERR(trans)) {
2448 btrfs_free_path(path);
2449 return PTR_ERR(trans);
2452 key.objectid = BTRFS_BALANCE_OBJECTID;
2453 key.type = BTRFS_BALANCE_ITEM_KEY;
2456 ret = btrfs_insert_empty_item(trans, root, path, &key,
2461 leaf = path->nodes[0];
2462 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item);
2464 memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item));
2466 btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->data);
2467 btrfs_set_balance_data(leaf, item, &disk_bargs);
2468 btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->meta);
2469 btrfs_set_balance_meta(leaf, item, &disk_bargs);
2470 btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->sys);
2471 btrfs_set_balance_sys(leaf, item, &disk_bargs);
2473 btrfs_set_balance_flags(leaf, item, bctl->flags);
2475 btrfs_mark_buffer_dirty(leaf);
2477 btrfs_free_path(path);
2478 err = btrfs_commit_transaction(trans, root);
2484 static int del_balance_item(struct btrfs_root *root)
2486 struct btrfs_trans_handle *trans;
2487 struct btrfs_path *path;
2488 struct btrfs_key key;
2491 path = btrfs_alloc_path();
2495 trans = btrfs_start_transaction(root, 0);
2496 if (IS_ERR(trans)) {
2497 btrfs_free_path(path);
2498 return PTR_ERR(trans);
2501 key.objectid = BTRFS_BALANCE_OBJECTID;
2502 key.type = BTRFS_BALANCE_ITEM_KEY;
2505 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
2513 ret = btrfs_del_item(trans, root, path);
2515 btrfs_free_path(path);
2516 err = btrfs_commit_transaction(trans, root);
2523 * This is a heuristic used to reduce the number of chunks balanced on
2524 * resume after balance was interrupted.
2526 static void update_balance_args(struct btrfs_balance_control *bctl)
2529 * Turn on soft mode for chunk types that were being converted.
2531 if (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT)
2532 bctl->data.flags |= BTRFS_BALANCE_ARGS_SOFT;
2533 if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT)
2534 bctl->sys.flags |= BTRFS_BALANCE_ARGS_SOFT;
2535 if (bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT)
2536 bctl->meta.flags |= BTRFS_BALANCE_ARGS_SOFT;
2539 * Turn on usage filter if is not already used. The idea is
2540 * that chunks that we have already balanced should be
2541 * reasonably full. Don't do it for chunks that are being
2542 * converted - that will keep us from relocating unconverted
2543 * (albeit full) chunks.
2545 if (!(bctl->data.flags & BTRFS_BALANCE_ARGS_USAGE) &&
2546 !(bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT)) {
2547 bctl->data.flags |= BTRFS_BALANCE_ARGS_USAGE;
2548 bctl->data.usage = 90;
2550 if (!(bctl->sys.flags & BTRFS_BALANCE_ARGS_USAGE) &&
2551 !(bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT)) {
2552 bctl->sys.flags |= BTRFS_BALANCE_ARGS_USAGE;
2553 bctl->sys.usage = 90;
2555 if (!(bctl->meta.flags & BTRFS_BALANCE_ARGS_USAGE) &&
2556 !(bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT)) {
2557 bctl->meta.flags |= BTRFS_BALANCE_ARGS_USAGE;
2558 bctl->meta.usage = 90;
2563 * Should be called with both balance and volume mutexes held to
2564 * serialize other volume operations (add_dev/rm_dev/resize) with
2565 * restriper. Same goes for unset_balance_control.
2567 static void set_balance_control(struct btrfs_balance_control *bctl)
2569 struct btrfs_fs_info *fs_info = bctl->fs_info;
2571 BUG_ON(fs_info->balance_ctl);
2573 spin_lock(&fs_info->balance_lock);
2574 fs_info->balance_ctl = bctl;
2575 spin_unlock(&fs_info->balance_lock);
2578 static void unset_balance_control(struct btrfs_fs_info *fs_info)
2580 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
2582 BUG_ON(!fs_info->balance_ctl);
2584 spin_lock(&fs_info->balance_lock);
2585 fs_info->balance_ctl = NULL;
2586 spin_unlock(&fs_info->balance_lock);
2592 * Balance filters. Return 1 if chunk should be filtered out
2593 * (should not be balanced).
2595 static int chunk_profiles_filter(u64 chunk_type,
2596 struct btrfs_balance_args *bargs)
2598 chunk_type = chunk_to_extended(chunk_type) &
2599 BTRFS_EXTENDED_PROFILE_MASK;
2601 if (bargs->profiles & chunk_type)
2607 static int chunk_usage_filter(struct btrfs_fs_info *fs_info, u64 chunk_offset,
2608 struct btrfs_balance_args *bargs)
2610 struct btrfs_block_group_cache *cache;
2611 u64 chunk_used, user_thresh;
2614 cache = btrfs_lookup_block_group(fs_info, chunk_offset);
2615 chunk_used = btrfs_block_group_used(&cache->item);
2617 if (bargs->usage == 0)
2619 else if (bargs->usage > 100)
2620 user_thresh = cache->key.offset;
2622 user_thresh = div_factor_fine(cache->key.offset,
2625 if (chunk_used < user_thresh)
2628 btrfs_put_block_group(cache);
2632 static int chunk_devid_filter(struct extent_buffer *leaf,
2633 struct btrfs_chunk *chunk,
2634 struct btrfs_balance_args *bargs)
2636 struct btrfs_stripe *stripe;
2637 int num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
2640 for (i = 0; i < num_stripes; i++) {
2641 stripe = btrfs_stripe_nr(chunk, i);
2642 if (btrfs_stripe_devid(leaf, stripe) == bargs->devid)
2649 /* [pstart, pend) */
2650 static int chunk_drange_filter(struct extent_buffer *leaf,
2651 struct btrfs_chunk *chunk,
2653 struct btrfs_balance_args *bargs)
2655 struct btrfs_stripe *stripe;
2656 int num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
2662 if (!(bargs->flags & BTRFS_BALANCE_ARGS_DEVID))
2665 if (btrfs_chunk_type(leaf, chunk) & (BTRFS_BLOCK_GROUP_DUP |
2666 BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10))
2670 factor = num_stripes / factor;
2672 for (i = 0; i < num_stripes; i++) {
2673 stripe = btrfs_stripe_nr(chunk, i);
2674 if (btrfs_stripe_devid(leaf, stripe) != bargs->devid)
2677 stripe_offset = btrfs_stripe_offset(leaf, stripe);
2678 stripe_length = btrfs_chunk_length(leaf, chunk);
2679 do_div(stripe_length, factor);
2681 if (stripe_offset < bargs->pend &&
2682 stripe_offset + stripe_length > bargs->pstart)
2689 /* [vstart, vend) */
2690 static int chunk_vrange_filter(struct extent_buffer *leaf,
2691 struct btrfs_chunk *chunk,
2693 struct btrfs_balance_args *bargs)
2695 if (chunk_offset < bargs->vend &&
2696 chunk_offset + btrfs_chunk_length(leaf, chunk) > bargs->vstart)
2697 /* at least part of the chunk is inside this vrange */
2703 static int chunk_soft_convert_filter(u64 chunk_type,
2704 struct btrfs_balance_args *bargs)
2706 if (!(bargs->flags & BTRFS_BALANCE_ARGS_CONVERT))
2709 chunk_type = chunk_to_extended(chunk_type) &
2710 BTRFS_EXTENDED_PROFILE_MASK;
2712 if (bargs->target == chunk_type)
2718 static int should_balance_chunk(struct btrfs_root *root,
2719 struct extent_buffer *leaf,
2720 struct btrfs_chunk *chunk, u64 chunk_offset)
2722 struct btrfs_balance_control *bctl = root->fs_info->balance_ctl;
2723 struct btrfs_balance_args *bargs = NULL;
2724 u64 chunk_type = btrfs_chunk_type(leaf, chunk);
2727 if (!((chunk_type & BTRFS_BLOCK_GROUP_TYPE_MASK) &
2728 (bctl->flags & BTRFS_BALANCE_TYPE_MASK))) {
2732 if (chunk_type & BTRFS_BLOCK_GROUP_DATA)
2733 bargs = &bctl->data;
2734 else if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM)
2736 else if (chunk_type & BTRFS_BLOCK_GROUP_METADATA)
2737 bargs = &bctl->meta;
2739 /* profiles filter */
2740 if ((bargs->flags & BTRFS_BALANCE_ARGS_PROFILES) &&
2741 chunk_profiles_filter(chunk_type, bargs)) {
2746 if ((bargs->flags & BTRFS_BALANCE_ARGS_USAGE) &&
2747 chunk_usage_filter(bctl->fs_info, chunk_offset, bargs)) {
2752 if ((bargs->flags & BTRFS_BALANCE_ARGS_DEVID) &&
2753 chunk_devid_filter(leaf, chunk, bargs)) {
2757 /* drange filter, makes sense only with devid filter */
2758 if ((bargs->flags & BTRFS_BALANCE_ARGS_DRANGE) &&
2759 chunk_drange_filter(leaf, chunk, chunk_offset, bargs)) {
2764 if ((bargs->flags & BTRFS_BALANCE_ARGS_VRANGE) &&
2765 chunk_vrange_filter(leaf, chunk, chunk_offset, bargs)) {
2769 /* soft profile changing mode */
2770 if ((bargs->flags & BTRFS_BALANCE_ARGS_SOFT) &&
2771 chunk_soft_convert_filter(chunk_type, bargs)) {
2778 static int __btrfs_balance(struct btrfs_fs_info *fs_info)
2780 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
2781 struct btrfs_root *chunk_root = fs_info->chunk_root;
2782 struct btrfs_root *dev_root = fs_info->dev_root;
2783 struct list_head *devices;
2784 struct btrfs_device *device;
2787 struct btrfs_chunk *chunk;
2788 struct btrfs_path *path;
2789 struct btrfs_key key;
2790 struct btrfs_key found_key;
2791 struct btrfs_trans_handle *trans;
2792 struct extent_buffer *leaf;
2795 int enospc_errors = 0;
2796 bool counting = true;
2798 /* step one make some room on all the devices */
2799 devices = &fs_info->fs_devices->devices;
2800 list_for_each_entry(device, devices, dev_list) {
2801 old_size = device->total_bytes;
2802 size_to_free = div_factor(old_size, 1);
2803 size_to_free = min(size_to_free, (u64)1 * 1024 * 1024);
2804 if (!device->writeable ||
2805 device->total_bytes - device->bytes_used > size_to_free ||
2806 device->is_tgtdev_for_dev_replace)
2809 ret = btrfs_shrink_device(device, old_size - size_to_free);
2814 trans = btrfs_start_transaction(dev_root, 0);
2815 BUG_ON(IS_ERR(trans));
2817 ret = btrfs_grow_device(trans, device, old_size);
2820 btrfs_end_transaction(trans, dev_root);
2823 /* step two, relocate all the chunks */
2824 path = btrfs_alloc_path();
2830 /* zero out stat counters */
2831 spin_lock(&fs_info->balance_lock);
2832 memset(&bctl->stat, 0, sizeof(bctl->stat));
2833 spin_unlock(&fs_info->balance_lock);
2835 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
2836 key.offset = (u64)-1;
2837 key.type = BTRFS_CHUNK_ITEM_KEY;
2840 if ((!counting && atomic_read(&fs_info->balance_pause_req)) ||
2841 atomic_read(&fs_info->balance_cancel_req)) {
2846 ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0);
2851 * this shouldn't happen, it means the last relocate
2855 BUG(); /* FIXME break ? */
2857 ret = btrfs_previous_item(chunk_root, path, 0,
2858 BTRFS_CHUNK_ITEM_KEY);
2864 leaf = path->nodes[0];
2865 slot = path->slots[0];
2866 btrfs_item_key_to_cpu(leaf, &found_key, slot);
2868 if (found_key.objectid != key.objectid)
2871 /* chunk zero is special */
2872 if (found_key.offset == 0)
2875 chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
2878 spin_lock(&fs_info->balance_lock);
2879 bctl->stat.considered++;
2880 spin_unlock(&fs_info->balance_lock);
2883 ret = should_balance_chunk(chunk_root, leaf, chunk,
2885 btrfs_release_path(path);
2890 spin_lock(&fs_info->balance_lock);
2891 bctl->stat.expected++;
2892 spin_unlock(&fs_info->balance_lock);
2896 ret = btrfs_relocate_chunk(chunk_root,
2897 chunk_root->root_key.objectid,
2900 if (ret && ret != -ENOSPC)
2902 if (ret == -ENOSPC) {
2905 spin_lock(&fs_info->balance_lock);
2906 bctl->stat.completed++;
2907 spin_unlock(&fs_info->balance_lock);
2910 key.offset = found_key.offset - 1;
2914 btrfs_release_path(path);
2919 btrfs_free_path(path);
2920 if (enospc_errors) {
2921 printk(KERN_INFO "btrfs: %d enospc errors during balance\n",
2931 * alloc_profile_is_valid - see if a given profile is valid and reduced
2932 * @flags: profile to validate
2933 * @extended: if true @flags is treated as an extended profile
2935 static int alloc_profile_is_valid(u64 flags, int extended)
2937 u64 mask = (extended ? BTRFS_EXTENDED_PROFILE_MASK :
2938 BTRFS_BLOCK_GROUP_PROFILE_MASK);
2940 flags &= ~BTRFS_BLOCK_GROUP_TYPE_MASK;
2942 /* 1) check that all other bits are zeroed */
2946 /* 2) see if profile is reduced */
2948 return !extended; /* "0" is valid for usual profiles */
2950 /* true if exactly one bit set */
2951 return (flags & (flags - 1)) == 0;
2954 static inline int balance_need_close(struct btrfs_fs_info *fs_info)
2956 /* cancel requested || normal exit path */
2957 return atomic_read(&fs_info->balance_cancel_req) ||
2958 (atomic_read(&fs_info->balance_pause_req) == 0 &&
2959 atomic_read(&fs_info->balance_cancel_req) == 0);
2962 static void __cancel_balance(struct btrfs_fs_info *fs_info)
2966 unset_balance_control(fs_info);
2967 ret = del_balance_item(fs_info->tree_root);
2970 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
2973 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
2974 struct btrfs_ioctl_balance_args *bargs);
2977 * Should be called with both balance and volume mutexes held
2979 int btrfs_balance(struct btrfs_balance_control *bctl,
2980 struct btrfs_ioctl_balance_args *bargs)
2982 struct btrfs_fs_info *fs_info = bctl->fs_info;
2988 if (btrfs_fs_closing(fs_info) ||
2989 atomic_read(&fs_info->balance_pause_req) ||
2990 atomic_read(&fs_info->balance_cancel_req)) {
2995 allowed = btrfs_super_incompat_flags(fs_info->super_copy);
2996 if (allowed & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
3000 * In case of mixed groups both data and meta should be picked,
3001 * and identical options should be given for both of them.
3003 allowed = BTRFS_BALANCE_DATA | BTRFS_BALANCE_METADATA;
3004 if (mixed && (bctl->flags & allowed)) {
3005 if (!(bctl->flags & BTRFS_BALANCE_DATA) ||
3006 !(bctl->flags & BTRFS_BALANCE_METADATA) ||
3007 memcmp(&bctl->data, &bctl->meta, sizeof(bctl->data))) {
3008 printk(KERN_ERR "btrfs: with mixed groups data and "
3009 "metadata balance options must be the same\n");
3015 num_devices = fs_info->fs_devices->num_devices;
3016 btrfs_dev_replace_lock(&fs_info->dev_replace);
3017 if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) {
3018 BUG_ON(num_devices < 1);
3021 btrfs_dev_replace_unlock(&fs_info->dev_replace);
3022 allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE;
3023 if (num_devices == 1)
3024 allowed |= BTRFS_BLOCK_GROUP_DUP;
3025 else if (num_devices < 4)
3026 allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1);
3028 allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
3029 BTRFS_BLOCK_GROUP_RAID10);
3031 if ((bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
3032 (!alloc_profile_is_valid(bctl->data.target, 1) ||
3033 (bctl->data.target & ~allowed))) {
3034 printk(KERN_ERR "btrfs: unable to start balance with target "
3035 "data profile %llu\n",
3036 (unsigned long long)bctl->data.target);
3040 if ((bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
3041 (!alloc_profile_is_valid(bctl->meta.target, 1) ||
3042 (bctl->meta.target & ~allowed))) {
3043 printk(KERN_ERR "btrfs: unable to start balance with target "
3044 "metadata profile %llu\n",
3045 (unsigned long long)bctl->meta.target);
3049 if ((bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
3050 (!alloc_profile_is_valid(bctl->sys.target, 1) ||
3051 (bctl->sys.target & ~allowed))) {
3052 printk(KERN_ERR "btrfs: unable to start balance with target "
3053 "system profile %llu\n",
3054 (unsigned long long)bctl->sys.target);
3059 /* allow dup'ed data chunks only in mixed mode */
3060 if (!mixed && (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
3061 (bctl->data.target & BTRFS_BLOCK_GROUP_DUP)) {
3062 printk(KERN_ERR "btrfs: dup for data is not allowed\n");
3067 /* allow to reduce meta or sys integrity only if force set */
3068 allowed = BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 |
3069 BTRFS_BLOCK_GROUP_RAID10;
3070 if (((bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
3071 (fs_info->avail_system_alloc_bits & allowed) &&
3072 !(bctl->sys.target & allowed)) ||
3073 ((bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
3074 (fs_info->avail_metadata_alloc_bits & allowed) &&
3075 !(bctl->meta.target & allowed))) {
3076 if (bctl->flags & BTRFS_BALANCE_FORCE) {
3077 printk(KERN_INFO "btrfs: force reducing metadata "
3080 printk(KERN_ERR "btrfs: balance will reduce metadata "
3081 "integrity, use force if you want this\n");
3087 if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) {
3088 int num_tolerated_disk_barrier_failures;
3089 u64 target = bctl->sys.target;
3091 num_tolerated_disk_barrier_failures =
3092 btrfs_calc_num_tolerated_disk_barrier_failures(fs_info);
3093 if (num_tolerated_disk_barrier_failures > 0 &&
3095 (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 |
3096 BTRFS_AVAIL_ALLOC_BIT_SINGLE)))
3097 num_tolerated_disk_barrier_failures = 0;
3098 else if (num_tolerated_disk_barrier_failures > 1 &&
3100 (BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10)))
3101 num_tolerated_disk_barrier_failures = 1;
3103 fs_info->num_tolerated_disk_barrier_failures =
3104 num_tolerated_disk_barrier_failures;
3107 ret = insert_balance_item(fs_info->tree_root, bctl);
3108 if (ret && ret != -EEXIST)
3111 if (!(bctl->flags & BTRFS_BALANCE_RESUME)) {
3112 BUG_ON(ret == -EEXIST);
3113 set_balance_control(bctl);
3115 BUG_ON(ret != -EEXIST);
3116 spin_lock(&fs_info->balance_lock);
3117 update_balance_args(bctl);
3118 spin_unlock(&fs_info->balance_lock);
3121 atomic_inc(&fs_info->balance_running);
3122 mutex_unlock(&fs_info->balance_mutex);
3124 ret = __btrfs_balance(fs_info);
3126 mutex_lock(&fs_info->balance_mutex);
3127 atomic_dec(&fs_info->balance_running);
3130 memset(bargs, 0, sizeof(*bargs));
3131 update_ioctl_balance_args(fs_info, 0, bargs);
3134 if ((ret && ret != -ECANCELED && ret != -ENOSPC) ||
3135 balance_need_close(fs_info)) {
3136 __cancel_balance(fs_info);
3139 if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) {
3140 fs_info->num_tolerated_disk_barrier_failures =
3141 btrfs_calc_num_tolerated_disk_barrier_failures(fs_info);
3144 wake_up(&fs_info->balance_wait_q);
3148 if (bctl->flags & BTRFS_BALANCE_RESUME)
3149 __cancel_balance(fs_info);
3152 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
3157 static int balance_kthread(void *data)
3159 struct btrfs_fs_info *fs_info = data;
3162 mutex_lock(&fs_info->volume_mutex);
3163 mutex_lock(&fs_info->balance_mutex);
3165 if (fs_info->balance_ctl) {
3166 printk(KERN_INFO "btrfs: continuing balance\n");
3167 ret = btrfs_balance(fs_info->balance_ctl, NULL);
3170 mutex_unlock(&fs_info->balance_mutex);
3171 mutex_unlock(&fs_info->volume_mutex);
3176 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info)
3178 struct task_struct *tsk;
3180 spin_lock(&fs_info->balance_lock);
3181 if (!fs_info->balance_ctl) {
3182 spin_unlock(&fs_info->balance_lock);
3185 spin_unlock(&fs_info->balance_lock);
3187 if (btrfs_test_opt(fs_info->tree_root, SKIP_BALANCE)) {
3188 printk(KERN_INFO "btrfs: force skipping balance\n");
3192 tsk = kthread_run(balance_kthread, fs_info, "btrfs-balance");
3194 return PTR_ERR(tsk);
3199 int btrfs_recover_balance(struct btrfs_fs_info *fs_info)
3201 struct btrfs_balance_control *bctl;
3202 struct btrfs_balance_item *item;
3203 struct btrfs_disk_balance_args disk_bargs;
3204 struct btrfs_path *path;
3205 struct extent_buffer *leaf;
3206 struct btrfs_key key;
3209 path = btrfs_alloc_path();
3213 key.objectid = BTRFS_BALANCE_OBJECTID;
3214 key.type = BTRFS_BALANCE_ITEM_KEY;
3217 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
3220 if (ret > 0) { /* ret = -ENOENT; */
3225 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
3231 leaf = path->nodes[0];
3232 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item);
3234 bctl->fs_info = fs_info;
3235 bctl->flags = btrfs_balance_flags(leaf, item);
3236 bctl->flags |= BTRFS_BALANCE_RESUME;
3238 btrfs_balance_data(leaf, item, &disk_bargs);
3239 btrfs_disk_balance_args_to_cpu(&bctl->data, &disk_bargs);
3240 btrfs_balance_meta(leaf, item, &disk_bargs);
3241 btrfs_disk_balance_args_to_cpu(&bctl->meta, &disk_bargs);
3242 btrfs_balance_sys(leaf, item, &disk_bargs);
3243 btrfs_disk_balance_args_to_cpu(&bctl->sys, &disk_bargs);
3245 WARN_ON(atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1));
3247 mutex_lock(&fs_info->volume_mutex);
3248 mutex_lock(&fs_info->balance_mutex);
3250 set_balance_control(bctl);
3252 mutex_unlock(&fs_info->balance_mutex);
3253 mutex_unlock(&fs_info->volume_mutex);
3255 btrfs_free_path(path);
3259 int btrfs_pause_balance(struct btrfs_fs_info *fs_info)
3263 mutex_lock(&fs_info->balance_mutex);
3264 if (!fs_info->balance_ctl) {
3265 mutex_unlock(&fs_info->balance_mutex);
3269 if (atomic_read(&fs_info->balance_running)) {
3270 atomic_inc(&fs_info->balance_pause_req);
3271 mutex_unlock(&fs_info->balance_mutex);
3273 wait_event(fs_info->balance_wait_q,
3274 atomic_read(&fs_info->balance_running) == 0);
3276 mutex_lock(&fs_info->balance_mutex);
3277 /* we are good with balance_ctl ripped off from under us */
3278 BUG_ON(atomic_read(&fs_info->balance_running));
3279 atomic_dec(&fs_info->balance_pause_req);
3284 mutex_unlock(&fs_info->balance_mutex);
3288 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info)
3290 mutex_lock(&fs_info->balance_mutex);
3291 if (!fs_info->balance_ctl) {
3292 mutex_unlock(&fs_info->balance_mutex);
3296 atomic_inc(&fs_info->balance_cancel_req);
3298 * if we are running just wait and return, balance item is
3299 * deleted in btrfs_balance in this case
3301 if (atomic_read(&fs_info->balance_running)) {
3302 mutex_unlock(&fs_info->balance_mutex);
3303 wait_event(fs_info->balance_wait_q,
3304 atomic_read(&fs_info->balance_running) == 0);
3305 mutex_lock(&fs_info->balance_mutex);
3307 /* __cancel_balance needs volume_mutex */
3308 mutex_unlock(&fs_info->balance_mutex);
3309 mutex_lock(&fs_info->volume_mutex);
3310 mutex_lock(&fs_info->balance_mutex);
3312 if (fs_info->balance_ctl)
3313 __cancel_balance(fs_info);
3315 mutex_unlock(&fs_info->volume_mutex);
3318 BUG_ON(fs_info->balance_ctl || atomic_read(&fs_info->balance_running));
3319 atomic_dec(&fs_info->balance_cancel_req);
3320 mutex_unlock(&fs_info->balance_mutex);
3325 * shrinking a device means finding all of the device extents past
3326 * the new size, and then following the back refs to the chunks.
3327 * The chunk relocation code actually frees the device extent
3329 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
3331 struct btrfs_trans_handle *trans;
3332 struct btrfs_root *root = device->dev_root;
3333 struct btrfs_dev_extent *dev_extent = NULL;
3334 struct btrfs_path *path;
3342 bool retried = false;
3343 struct extent_buffer *l;
3344 struct btrfs_key key;
3345 struct btrfs_super_block *super_copy = root->fs_info->super_copy;
3346 u64 old_total = btrfs_super_total_bytes(super_copy);
3347 u64 old_size = device->total_bytes;
3348 u64 diff = device->total_bytes - new_size;
3350 if (device->is_tgtdev_for_dev_replace)
3353 path = btrfs_alloc_path();
3361 device->total_bytes = new_size;
3362 if (device->writeable) {
3363 device->fs_devices->total_rw_bytes -= diff;
3364 spin_lock(&root->fs_info->free_chunk_lock);
3365 root->fs_info->free_chunk_space -= diff;
3366 spin_unlock(&root->fs_info->free_chunk_lock);
3368 unlock_chunks(root);
3371 key.objectid = device->devid;
3372 key.offset = (u64)-1;
3373 key.type = BTRFS_DEV_EXTENT_KEY;
3376 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3380 ret = btrfs_previous_item(root, path, 0, key.type);
3385 btrfs_release_path(path);
3390 slot = path->slots[0];
3391 btrfs_item_key_to_cpu(l, &key, path->slots[0]);
3393 if (key.objectid != device->devid) {
3394 btrfs_release_path(path);
3398 dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
3399 length = btrfs_dev_extent_length(l, dev_extent);
3401 if (key.offset + length <= new_size) {
3402 btrfs_release_path(path);
3406 chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent);
3407 chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent);
3408 chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent);
3409 btrfs_release_path(path);
3411 ret = btrfs_relocate_chunk(root, chunk_tree, chunk_objectid,
3413 if (ret && ret != -ENOSPC)
3417 } while (key.offset-- > 0);
3419 if (failed && !retried) {
3423 } else if (failed && retried) {
3427 device->total_bytes = old_size;
3428 if (device->writeable)
3429 device->fs_devices->total_rw_bytes += diff;
3430 spin_lock(&root->fs_info->free_chunk_lock);
3431 root->fs_info->free_chunk_space += diff;
3432 spin_unlock(&root->fs_info->free_chunk_lock);
3433 unlock_chunks(root);
3437 /* Shrinking succeeded, else we would be at "done". */
3438 trans = btrfs_start_transaction(root, 0);
3439 if (IS_ERR(trans)) {
3440 ret = PTR_ERR(trans);
3446 device->disk_total_bytes = new_size;
3447 /* Now btrfs_update_device() will change the on-disk size. */
3448 ret = btrfs_update_device(trans, device);
3450 unlock_chunks(root);
3451 btrfs_end_transaction(trans, root);
3454 WARN_ON(diff > old_total);
3455 btrfs_set_super_total_bytes(super_copy, old_total - diff);
3456 unlock_chunks(root);
3457 btrfs_end_transaction(trans, root);
3459 btrfs_free_path(path);
3463 static int btrfs_add_system_chunk(struct btrfs_root *root,
3464 struct btrfs_key *key,
3465 struct btrfs_chunk *chunk, int item_size)
3467 struct btrfs_super_block *super_copy = root->fs_info->super_copy;
3468 struct btrfs_disk_key disk_key;
3472 array_size = btrfs_super_sys_array_size(super_copy);
3473 if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE)
3476 ptr = super_copy->sys_chunk_array + array_size;
3477 btrfs_cpu_key_to_disk(&disk_key, key);
3478 memcpy(ptr, &disk_key, sizeof(disk_key));
3479 ptr += sizeof(disk_key);
3480 memcpy(ptr, chunk, item_size);
3481 item_size += sizeof(disk_key);
3482 btrfs_set_super_sys_array_size(super_copy, array_size + item_size);
3487 * sort the devices in descending order by max_avail, total_avail
3489 static int btrfs_cmp_device_info(const void *a, const void *b)
3491 const struct btrfs_device_info *di_a = a;
3492 const struct btrfs_device_info *di_b = b;
3494 if (di_a->max_avail > di_b->max_avail)
3496 if (di_a->max_avail < di_b->max_avail)
3498 if (di_a->total_avail > di_b->total_avail)
3500 if (di_a->total_avail < di_b->total_avail)
3505 struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
3506 { 2, 1, 0, 4, 2, 2 /* raid10 */ },
3507 { 1, 1, 2, 2, 2, 2 /* raid1 */ },
3508 { 1, 2, 1, 1, 1, 2 /* dup */ },
3509 { 1, 1, 0, 2, 1, 1 /* raid0 */ },
3510 { 1, 1, 1, 1, 1, 1 /* single */ },
3513 static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
3514 struct btrfs_root *extent_root,
3515 struct map_lookup **map_ret,
3516 u64 *num_bytes_out, u64 *stripe_size_out,
3517 u64 start, u64 type)
3519 struct btrfs_fs_info *info = extent_root->fs_info;
3520 struct btrfs_fs_devices *fs_devices = info->fs_devices;
3521 struct list_head *cur;
3522 struct map_lookup *map = NULL;
3523 struct extent_map_tree *em_tree;
3524 struct extent_map *em;
3525 struct btrfs_device_info *devices_info = NULL;
3527 int num_stripes; /* total number of stripes to allocate */
3528 int sub_stripes; /* sub_stripes info for map */
3529 int dev_stripes; /* stripes per dev */
3530 int devs_max; /* max devs to use */
3531 int devs_min; /* min devs needed */
3532 int devs_increment; /* ndevs has to be a multiple of this */
3533 int ncopies; /* how many copies to data has */
3535 u64 max_stripe_size;
3544 BUG_ON(!alloc_profile_is_valid(type, 0));
3546 if (list_empty(&fs_devices->alloc_list))
3549 index = __get_raid_index(type);
3551 sub_stripes = btrfs_raid_array[index].sub_stripes;
3552 dev_stripes = btrfs_raid_array[index].dev_stripes;
3553 devs_max = btrfs_raid_array[index].devs_max;
3554 devs_min = btrfs_raid_array[index].devs_min;
3555 devs_increment = btrfs_raid_array[index].devs_increment;
3556 ncopies = btrfs_raid_array[index].ncopies;
3558 if (type & BTRFS_BLOCK_GROUP_DATA) {
3559 max_stripe_size = 1024 * 1024 * 1024;
3560 max_chunk_size = 10 * max_stripe_size;
3561 } else if (type & BTRFS_BLOCK_GROUP_METADATA) {
3562 /* for larger filesystems, use larger metadata chunks */
3563 if (fs_devices->total_rw_bytes > 50ULL * 1024 * 1024 * 1024)
3564 max_stripe_size = 1024 * 1024 * 1024;
3566 max_stripe_size = 256 * 1024 * 1024;
3567 max_chunk_size = max_stripe_size;
3568 } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
3569 max_stripe_size = 32 * 1024 * 1024;
3570 max_chunk_size = 2 * max_stripe_size;
3572 printk(KERN_ERR "btrfs: invalid chunk type 0x%llx requested\n",
3577 /* we don't want a chunk larger than 10% of writeable space */
3578 max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1),
3581 devices_info = kzalloc(sizeof(*devices_info) * fs_devices->rw_devices,
3586 cur = fs_devices->alloc_list.next;
3589 * in the first pass through the devices list, we gather information
3590 * about the available holes on each device.
3593 while (cur != &fs_devices->alloc_list) {
3594 struct btrfs_device *device;
3598 device = list_entry(cur, struct btrfs_device, dev_alloc_list);
3602 if (!device->writeable) {
3604 "btrfs: read-only device in alloc_list\n");
3608 if (!device->in_fs_metadata ||
3609 device->is_tgtdev_for_dev_replace)
3612 if (device->total_bytes > device->bytes_used)
3613 total_avail = device->total_bytes - device->bytes_used;
3617 /* If there is no space on this device, skip it. */
3618 if (total_avail == 0)
3621 ret = find_free_dev_extent(device,
3622 max_stripe_size * dev_stripes,
3623 &dev_offset, &max_avail);
3624 if (ret && ret != -ENOSPC)
3628 max_avail = max_stripe_size * dev_stripes;
3630 if (max_avail < BTRFS_STRIPE_LEN * dev_stripes)
3633 devices_info[ndevs].dev_offset = dev_offset;
3634 devices_info[ndevs].max_avail = max_avail;
3635 devices_info[ndevs].total_avail = total_avail;
3636 devices_info[ndevs].dev = device;
3638 WARN_ON(ndevs > fs_devices->rw_devices);
3642 * now sort the devices by hole size / available space
3644 sort(devices_info, ndevs, sizeof(struct btrfs_device_info),
3645 btrfs_cmp_device_info, NULL);
3647 /* round down to number of usable stripes */
3648 ndevs -= ndevs % devs_increment;
3650 if (ndevs < devs_increment * sub_stripes || ndevs < devs_min) {
3655 if (devs_max && ndevs > devs_max)
3658 * the primary goal is to maximize the number of stripes, so use as many
3659 * devices as possible, even if the stripes are not maximum sized.
3661 stripe_size = devices_info[ndevs-1].max_avail;
3662 num_stripes = ndevs * dev_stripes;
3664 if (stripe_size * ndevs > max_chunk_size * ncopies) {
3665 stripe_size = max_chunk_size * ncopies;
3666 do_div(stripe_size, ndevs);
3669 do_div(stripe_size, dev_stripes);
3671 /* align to BTRFS_STRIPE_LEN */
3672 do_div(stripe_size, BTRFS_STRIPE_LEN);
3673 stripe_size *= BTRFS_STRIPE_LEN;
3675 map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
3680 map->num_stripes = num_stripes;
3682 for (i = 0; i < ndevs; ++i) {
3683 for (j = 0; j < dev_stripes; ++j) {
3684 int s = i * dev_stripes + j;
3685 map->stripes[s].dev = devices_info[i].dev;
3686 map->stripes[s].physical = devices_info[i].dev_offset +
3690 map->sector_size = extent_root->sectorsize;
3691 map->stripe_len = BTRFS_STRIPE_LEN;
3692 map->io_align = BTRFS_STRIPE_LEN;
3693 map->io_width = BTRFS_STRIPE_LEN;
3695 map->sub_stripes = sub_stripes;
3698 num_bytes = stripe_size * (num_stripes / ncopies);
3700 *stripe_size_out = stripe_size;
3701 *num_bytes_out = num_bytes;
3703 trace_btrfs_chunk_alloc(info->chunk_root, map, start, num_bytes);
3705 em = alloc_extent_map();
3710 em->bdev = (struct block_device *)map;
3712 em->len = num_bytes;
3713 em->block_start = 0;
3714 em->block_len = em->len;
3716 em_tree = &extent_root->fs_info->mapping_tree.map_tree;
3717 write_lock(&em_tree->lock);
3718 ret = add_extent_mapping(em_tree, em);
3719 write_unlock(&em_tree->lock);
3720 free_extent_map(em);
3724 ret = btrfs_make_block_group(trans, extent_root, 0, type,
3725 BTRFS_FIRST_CHUNK_TREE_OBJECTID,
3730 for (i = 0; i < map->num_stripes; ++i) {
3731 struct btrfs_device *device;
3734 device = map->stripes[i].dev;
3735 dev_offset = map->stripes[i].physical;
3737 ret = btrfs_alloc_dev_extent(trans, device,
3738 info->chunk_root->root_key.objectid,
3739 BTRFS_FIRST_CHUNK_TREE_OBJECTID,
3740 start, dev_offset, stripe_size);
3742 btrfs_abort_transaction(trans, extent_root, ret);
3747 kfree(devices_info);
3752 kfree(devices_info);
3756 static int __finish_chunk_alloc(struct btrfs_trans_handle *trans,
3757 struct btrfs_root *extent_root,
3758 struct map_lookup *map, u64 chunk_offset,
3759 u64 chunk_size, u64 stripe_size)
3762 struct btrfs_key key;
3763 struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root;
3764 struct btrfs_device *device;
3765 struct btrfs_chunk *chunk;
3766 struct btrfs_stripe *stripe;
3767 size_t item_size = btrfs_chunk_item_size(map->num_stripes);
3771 chunk = kzalloc(item_size, GFP_NOFS);
3776 while (index < map->num_stripes) {
3777 device = map->stripes[index].dev;
3778 device->bytes_used += stripe_size;
3779 ret = btrfs_update_device(trans, device);
3785 spin_lock(&extent_root->fs_info->free_chunk_lock);
3786 extent_root->fs_info->free_chunk_space -= (stripe_size *
3788 spin_unlock(&extent_root->fs_info->free_chunk_lock);
3791 stripe = &chunk->stripe;
3792 while (index < map->num_stripes) {
3793 device = map->stripes[index].dev;
3794 dev_offset = map->stripes[index].physical;
3796 btrfs_set_stack_stripe_devid(stripe, device->devid);
3797 btrfs_set_stack_stripe_offset(stripe, dev_offset);
3798 memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE);
3803 btrfs_set_stack_chunk_length(chunk, chunk_size);
3804 btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid);
3805 btrfs_set_stack_chunk_stripe_len(chunk, map->stripe_len);
3806 btrfs_set_stack_chunk_type(chunk, map->type);
3807 btrfs_set_stack_chunk_num_stripes(chunk, map->num_stripes);
3808 btrfs_set_stack_chunk_io_align(chunk, map->stripe_len);
3809 btrfs_set_stack_chunk_io_width(chunk, map->stripe_len);
3810 btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize);
3811 btrfs_set_stack_chunk_sub_stripes(chunk, map->sub_stripes);
3813 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
3814 key.type = BTRFS_CHUNK_ITEM_KEY;
3815 key.offset = chunk_offset;
3817 ret = btrfs_insert_item(trans, chunk_root, &key, chunk, item_size);
3819 if (ret == 0 && map->type & BTRFS_BLOCK_GROUP_SYSTEM) {
3821 * TODO: Cleanup of inserted chunk root in case of
3824 ret = btrfs_add_system_chunk(chunk_root, &key, chunk,
3834 * Chunk allocation falls into two parts. The first part does works
3835 * that make the new allocated chunk useable, but not do any operation
3836 * that modifies the chunk tree. The second part does the works that
3837 * require modifying the chunk tree. This division is important for the
3838 * bootstrap process of adding storage to a seed btrfs.
3840 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
3841 struct btrfs_root *extent_root, u64 type)
3846 struct map_lookup *map;
3847 struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root;
3850 ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
3855 ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size,
3856 &stripe_size, chunk_offset, type);
3860 ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset,
3861 chunk_size, stripe_size);
3867 static noinline int init_first_rw_device(struct btrfs_trans_handle *trans,
3868 struct btrfs_root *root,
3869 struct btrfs_device *device)
3872 u64 sys_chunk_offset;
3876 u64 sys_stripe_size;
3878 struct map_lookup *map;
3879 struct map_lookup *sys_map;
3880 struct btrfs_fs_info *fs_info = root->fs_info;
3881 struct btrfs_root *extent_root = fs_info->extent_root;
3884 ret = find_next_chunk(fs_info->chunk_root,
3885 BTRFS_FIRST_CHUNK_TREE_OBJECTID, &chunk_offset);
3889 alloc_profile = BTRFS_BLOCK_GROUP_METADATA |
3890 fs_info->avail_metadata_alloc_bits;
3891 alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile);
3893 ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size,
3894 &stripe_size, chunk_offset, alloc_profile);
3898 sys_chunk_offset = chunk_offset + chunk_size;
3900 alloc_profile = BTRFS_BLOCK_GROUP_SYSTEM |
3901 fs_info->avail_system_alloc_bits;
3902 alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile);
3904 ret = __btrfs_alloc_chunk(trans, extent_root, &sys_map,
3905 &sys_chunk_size, &sys_stripe_size,
3906 sys_chunk_offset, alloc_profile);
3908 btrfs_abort_transaction(trans, root, ret);
3912 ret = btrfs_add_device(trans, fs_info->chunk_root, device);
3914 btrfs_abort_transaction(trans, root, ret);
3919 * Modifying chunk tree needs allocating new blocks from both
3920 * system block group and metadata block group. So we only can
3921 * do operations require modifying the chunk tree after both
3922 * block groups were created.
3924 ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset,
3925 chunk_size, stripe_size);
3927 btrfs_abort_transaction(trans, root, ret);
3931 ret = __finish_chunk_alloc(trans, extent_root, sys_map,
3932 sys_chunk_offset, sys_chunk_size,
3935 btrfs_abort_transaction(trans, root, ret);
3942 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset)
3944 struct extent_map *em;
3945 struct map_lookup *map;
3946 struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree;
3950 read_lock(&map_tree->map_tree.lock);
3951 em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1);
3952 read_unlock(&map_tree->map_tree.lock);
3956 if (btrfs_test_opt(root, DEGRADED)) {
3957 free_extent_map(em);
3961 map = (struct map_lookup *)em->bdev;
3962 for (i = 0; i < map->num_stripes; i++) {
3963 if (!map->stripes[i].dev->writeable) {
3968 free_extent_map(em);
3972 void btrfs_mapping_init(struct btrfs_mapping_tree *tree)
3974 extent_map_tree_init(&tree->map_tree);
3977 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree)
3979 struct extent_map *em;
3982 write_lock(&tree->map_tree.lock);
3983 em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1);
3985 remove_extent_mapping(&tree->map_tree, em);
3986 write_unlock(&tree->map_tree.lock);
3991 free_extent_map(em);
3992 /* once for the tree */
3993 free_extent_map(em);
3997 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
3999 struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
4000 struct extent_map *em;
4001 struct map_lookup *map;
4002 struct extent_map_tree *em_tree = &map_tree->map_tree;
4005 read_lock(&em_tree->lock);
4006 em = lookup_extent_mapping(em_tree, logical, len);
4007 read_unlock(&em_tree->lock);
4010 BUG_ON(em->start > logical || em->start + em->len < logical);
4011 map = (struct map_lookup *)em->bdev;
4012 if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1))
4013 ret = map->num_stripes;
4014 else if (map->type & BTRFS_BLOCK_GROUP_RAID10)
4015 ret = map->sub_stripes;
4018 free_extent_map(em);
4020 btrfs_dev_replace_lock(&fs_info->dev_replace);
4021 if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))
4023 btrfs_dev_replace_unlock(&fs_info->dev_replace);
4028 static int find_live_mirror(struct btrfs_fs_info *fs_info,
4029 struct map_lookup *map, int first, int num,
4030 int optimal, int dev_replace_is_ongoing)
4034 struct btrfs_device *srcdev;
4036 if (dev_replace_is_ongoing &&
4037 fs_info->dev_replace.cont_reading_from_srcdev_mode ==
4038 BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID)
4039 srcdev = fs_info->dev_replace.srcdev;
4044 * try to avoid the drive that is the source drive for a
4045 * dev-replace procedure, only choose it if no other non-missing
4046 * mirror is available
4048 for (tolerance = 0; tolerance < 2; tolerance++) {
4049 if (map->stripes[optimal].dev->bdev &&
4050 (tolerance || map->stripes[optimal].dev != srcdev))
4052 for (i = first; i < first + num; i++) {
4053 if (map->stripes[i].dev->bdev &&
4054 (tolerance || map->stripes[i].dev != srcdev))
4059 /* we couldn't find one that doesn't fail. Just return something
4060 * and the io error handling code will clean up eventually
4065 static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
4066 u64 logical, u64 *length,
4067 struct btrfs_bio **bbio_ret,
4070 struct extent_map *em;
4071 struct map_lookup *map;
4072 struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
4073 struct extent_map_tree *em_tree = &map_tree->map_tree;
4076 u64 stripe_end_offset;
4085 struct btrfs_bio *bbio = NULL;
4086 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
4087 int dev_replace_is_ongoing = 0;
4088 int num_alloc_stripes;
4089 int patch_the_first_stripe_for_dev_replace = 0;
4090 u64 physical_to_patch_in_first_stripe = 0;
4092 read_lock(&em_tree->lock);
4093 em = lookup_extent_mapping(em_tree, logical, *length);
4094 read_unlock(&em_tree->lock);
4097 printk(KERN_CRIT "btrfs: unable to find logical %llu len %llu\n",
4098 (unsigned long long)logical,
4099 (unsigned long long)*length);
4103 BUG_ON(em->start > logical || em->start + em->len < logical);
4104 map = (struct map_lookup *)em->bdev;
4105 offset = logical - em->start;
4109 * stripe_nr counts the total number of stripes we have to stride
4110 * to get to this block
4112 do_div(stripe_nr, map->stripe_len);
4114 stripe_offset = stripe_nr * map->stripe_len;
4115 BUG_ON(offset < stripe_offset);
4117 /* stripe_offset is the offset of this block in its stripe*/
4118 stripe_offset = offset - stripe_offset;
4120 if (rw & REQ_DISCARD)
4121 *length = min_t(u64, em->len - offset, *length);
4122 else if (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
4123 /* we limit the length of each bio to what fits in a stripe */
4124 *length = min_t(u64, em->len - offset,
4125 map->stripe_len - stripe_offset);
4127 *length = em->len - offset;
4133 btrfs_dev_replace_lock(dev_replace);
4134 dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(dev_replace);
4135 if (!dev_replace_is_ongoing)
4136 btrfs_dev_replace_unlock(dev_replace);
4138 if (dev_replace_is_ongoing && mirror_num == map->num_stripes + 1 &&
4139 !(rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)) &&
4140 dev_replace->tgtdev != NULL) {
4142 * in dev-replace case, for repair case (that's the only
4143 * case where the mirror is selected explicitly when
4144 * calling btrfs_map_block), blocks left of the left cursor
4145 * can also be read from the target drive.
4146 * For REQ_GET_READ_MIRRORS, the target drive is added as
4147 * the last one to the array of stripes. For READ, it also
4148 * needs to be supported using the same mirror number.
4149 * If the requested block is not left of the left cursor,
4150 * EIO is returned. This can happen because btrfs_num_copies()
4151 * returns one more in the dev-replace case.
4153 u64 tmp_length = *length;
4154 struct btrfs_bio *tmp_bbio = NULL;
4155 int tmp_num_stripes;
4156 u64 srcdev_devid = dev_replace->srcdev->devid;
4157 int index_srcdev = 0;
4159 u64 physical_of_found = 0;
4161 ret = __btrfs_map_block(fs_info, REQ_GET_READ_MIRRORS,
4162 logical, &tmp_length, &tmp_bbio, 0);
4164 WARN_ON(tmp_bbio != NULL);
4168 tmp_num_stripes = tmp_bbio->num_stripes;
4169 if (mirror_num > tmp_num_stripes) {
4171 * REQ_GET_READ_MIRRORS does not contain this
4172 * mirror, that means that the requested area
4173 * is not left of the left cursor
4181 * process the rest of the function using the mirror_num
4182 * of the source drive. Therefore look it up first.
4183 * At the end, patch the device pointer to the one of the
4186 for (i = 0; i < tmp_num_stripes; i++) {
4187 if (tmp_bbio->stripes[i].dev->devid == srcdev_devid) {
4189 * In case of DUP, in order to keep it
4190 * simple, only add the mirror with the
4191 * lowest physical address
4194 physical_of_found <=
4195 tmp_bbio->stripes[i].physical)
4200 tmp_bbio->stripes[i].physical;
4205 mirror_num = index_srcdev + 1;
4206 patch_the_first_stripe_for_dev_replace = 1;
4207 physical_to_patch_in_first_stripe = physical_of_found;
4216 } else if (mirror_num > map->num_stripes) {
4222 stripe_nr_orig = stripe_nr;
4223 stripe_nr_end = (offset + *length + map->stripe_len - 1) &
4224 (~(map->stripe_len - 1));
4225 do_div(stripe_nr_end, map->stripe_len);
4226 stripe_end_offset = stripe_nr_end * map->stripe_len -
4228 if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
4229 if (rw & REQ_DISCARD)
4230 num_stripes = min_t(u64, map->num_stripes,
4231 stripe_nr_end - stripe_nr_orig);
4232 stripe_index = do_div(stripe_nr, map->num_stripes);
4233 } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
4234 if (rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS))
4235 num_stripes = map->num_stripes;
4236 else if (mirror_num)
4237 stripe_index = mirror_num - 1;
4239 stripe_index = find_live_mirror(fs_info, map, 0,
4241 current->pid % map->num_stripes,
4242 dev_replace_is_ongoing);
4243 mirror_num = stripe_index + 1;
4246 } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
4247 if (rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)) {
4248 num_stripes = map->num_stripes;
4249 } else if (mirror_num) {
4250 stripe_index = mirror_num - 1;
4255 } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
4256 int factor = map->num_stripes / map->sub_stripes;
4258 stripe_index = do_div(stripe_nr, factor);
4259 stripe_index *= map->sub_stripes;
4261 if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS))
4262 num_stripes = map->sub_stripes;
4263 else if (rw & REQ_DISCARD)
4264 num_stripes = min_t(u64, map->sub_stripes *
4265 (stripe_nr_end - stripe_nr_orig),
4267 else if (mirror_num)
4268 stripe_index += mirror_num - 1;
4270 int old_stripe_index = stripe_index;
4271 stripe_index = find_live_mirror(fs_info, map,
4273 map->sub_stripes, stripe_index +
4274 current->pid % map->sub_stripes,
4275 dev_replace_is_ongoing);
4276 mirror_num = stripe_index - old_stripe_index + 1;
4280 * after this do_div call, stripe_nr is the number of stripes
4281 * on this device we have to walk to find the data, and
4282 * stripe_index is the number of our device in the stripe array
4284 stripe_index = do_div(stripe_nr, map->num_stripes);
4285 mirror_num = stripe_index + 1;
4287 BUG_ON(stripe_index >= map->num_stripes);
4289 num_alloc_stripes = num_stripes;
4290 if (dev_replace_is_ongoing) {
4291 if (rw & (REQ_WRITE | REQ_DISCARD))
4292 num_alloc_stripes <<= 1;
4293 if (rw & REQ_GET_READ_MIRRORS)
4294 num_alloc_stripes++;
4296 bbio = kzalloc(btrfs_bio_size(num_alloc_stripes), GFP_NOFS);
4301 atomic_set(&bbio->error, 0);
4303 if (rw & REQ_DISCARD) {
4305 int sub_stripes = 0;
4306 u64 stripes_per_dev = 0;
4307 u32 remaining_stripes = 0;
4308 u32 last_stripe = 0;
4311 (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID10)) {
4312 if (map->type & BTRFS_BLOCK_GROUP_RAID0)
4315 sub_stripes = map->sub_stripes;
4317 factor = map->num_stripes / sub_stripes;
4318 stripes_per_dev = div_u64_rem(stripe_nr_end -
4321 &remaining_stripes);
4322 div_u64_rem(stripe_nr_end - 1, factor, &last_stripe);
4323 last_stripe *= sub_stripes;
4326 for (i = 0; i < num_stripes; i++) {
4327 bbio->stripes[i].physical =
4328 map->stripes[stripe_index].physical +
4329 stripe_offset + stripe_nr * map->stripe_len;
4330 bbio->stripes[i].dev = map->stripes[stripe_index].dev;
4332 if (map->type & (BTRFS_BLOCK_GROUP_RAID0 |
4333 BTRFS_BLOCK_GROUP_RAID10)) {
4334 bbio->stripes[i].length = stripes_per_dev *
4337 if (i / sub_stripes < remaining_stripes)
4338 bbio->stripes[i].length +=
4342 * Special for the first stripe and
4345 * |-------|...|-------|
4349 if (i < sub_stripes)
4350 bbio->stripes[i].length -=
4353 if (stripe_index >= last_stripe &&
4354 stripe_index <= (last_stripe +
4356 bbio->stripes[i].length -=
4359 if (i == sub_stripes - 1)
4362 bbio->stripes[i].length = *length;
4365 if (stripe_index == map->num_stripes) {
4366 /* This could only happen for RAID0/10 */
4372 for (i = 0; i < num_stripes; i++) {
4373 bbio->stripes[i].physical =
4374 map->stripes[stripe_index].physical +
4376 stripe_nr * map->stripe_len;
4377 bbio->stripes[i].dev =
4378 map->stripes[stripe_index].dev;
4383 if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) {
4384 if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
4385 BTRFS_BLOCK_GROUP_RAID10 |
4386 BTRFS_BLOCK_GROUP_DUP)) {
4391 if (dev_replace_is_ongoing && (rw & (REQ_WRITE | REQ_DISCARD)) &&
4392 dev_replace->tgtdev != NULL) {
4393 int index_where_to_add;
4394 u64 srcdev_devid = dev_replace->srcdev->devid;
4397 * duplicate the write operations while the dev replace
4398 * procedure is running. Since the copying of the old disk
4399 * to the new disk takes place at run time while the
4400 * filesystem is mounted writable, the regular write
4401 * operations to the old disk have to be duplicated to go
4402 * to the new disk as well.
4403 * Note that device->missing is handled by the caller, and
4404 * that the write to the old disk is already set up in the
4407 index_where_to_add = num_stripes;
4408 for (i = 0; i < num_stripes; i++) {
4409 if (bbio->stripes[i].dev->devid == srcdev_devid) {
4410 /* write to new disk, too */
4411 struct btrfs_bio_stripe *new =
4412 bbio->stripes + index_where_to_add;
4413 struct btrfs_bio_stripe *old =
4416 new->physical = old->physical;
4417 new->length = old->length;
4418 new->dev = dev_replace->tgtdev;
4419 index_where_to_add++;
4423 num_stripes = index_where_to_add;
4424 } else if (dev_replace_is_ongoing && (rw & REQ_GET_READ_MIRRORS) &&
4425 dev_replace->tgtdev != NULL) {
4426 u64 srcdev_devid = dev_replace->srcdev->devid;
4427 int index_srcdev = 0;
4429 u64 physical_of_found = 0;
4432 * During the dev-replace procedure, the target drive can
4433 * also be used to read data in case it is needed to repair
4434 * a corrupt block elsewhere. This is possible if the
4435 * requested area is left of the left cursor. In this area,
4436 * the target drive is a full copy of the source drive.
4438 for (i = 0; i < num_stripes; i++) {
4439 if (bbio->stripes[i].dev->devid == srcdev_devid) {
4441 * In case of DUP, in order to keep it
4442 * simple, only add the mirror with the
4443 * lowest physical address
4446 physical_of_found <=
4447 bbio->stripes[i].physical)
4451 physical_of_found = bbio->stripes[i].physical;
4455 u64 length = map->stripe_len;
4457 if (physical_of_found + length <=
4458 dev_replace->cursor_left) {
4459 struct btrfs_bio_stripe *tgtdev_stripe =
4460 bbio->stripes + num_stripes;
4462 tgtdev_stripe->physical = physical_of_found;
4463 tgtdev_stripe->length =
4464 bbio->stripes[index_srcdev].length;
4465 tgtdev_stripe->dev = dev_replace->tgtdev;
4473 bbio->num_stripes = num_stripes;
4474 bbio->max_errors = max_errors;
4475 bbio->mirror_num = mirror_num;
4478 * this is the case that REQ_READ && dev_replace_is_ongoing &&
4479 * mirror_num == num_stripes + 1 && dev_replace target drive is
4480 * available as a mirror
4482 if (patch_the_first_stripe_for_dev_replace && num_stripes > 0) {
4483 WARN_ON(num_stripes > 1);
4484 bbio->stripes[0].dev = dev_replace->tgtdev;
4485 bbio->stripes[0].physical = physical_to_patch_in_first_stripe;
4486 bbio->mirror_num = map->num_stripes + 1;
4489 if (dev_replace_is_ongoing)
4490 btrfs_dev_replace_unlock(dev_replace);
4491 free_extent_map(em);
4495 int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
4496 u64 logical, u64 *length,
4497 struct btrfs_bio **bbio_ret, int mirror_num)
4499 return __btrfs_map_block(fs_info, rw, logical, length, bbio_ret,
4503 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
4504 u64 chunk_start, u64 physical, u64 devid,
4505 u64 **logical, int *naddrs, int *stripe_len)
4507 struct extent_map_tree *em_tree = &map_tree->map_tree;
4508 struct extent_map *em;
4509 struct map_lookup *map;
4516 read_lock(&em_tree->lock);
4517 em = lookup_extent_mapping(em_tree, chunk_start, 1);
4518 read_unlock(&em_tree->lock);
4520 BUG_ON(!em || em->start != chunk_start);
4521 map = (struct map_lookup *)em->bdev;
4524 if (map->type & BTRFS_BLOCK_GROUP_RAID10)
4525 do_div(length, map->num_stripes / map->sub_stripes);
4526 else if (map->type & BTRFS_BLOCK_GROUP_RAID0)
4527 do_div(length, map->num_stripes);
4529 buf = kzalloc(sizeof(u64) * map->num_stripes, GFP_NOFS);
4530 BUG_ON(!buf); /* -ENOMEM */
4532 for (i = 0; i < map->num_stripes; i++) {
4533 if (devid && map->stripes[i].dev->devid != devid)
4535 if (map->stripes[i].physical > physical ||
4536 map->stripes[i].physical + length <= physical)
4539 stripe_nr = physical - map->stripes[i].physical;
4540 do_div(stripe_nr, map->stripe_len);
4542 if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
4543 stripe_nr = stripe_nr * map->num_stripes + i;
4544 do_div(stripe_nr, map->sub_stripes);
4545 } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
4546 stripe_nr = stripe_nr * map->num_stripes + i;
4548 bytenr = chunk_start + stripe_nr * map->stripe_len;
4549 WARN_ON(nr >= map->num_stripes);
4550 for (j = 0; j < nr; j++) {
4551 if (buf[j] == bytenr)
4555 WARN_ON(nr >= map->num_stripes);
4562 *stripe_len = map->stripe_len;
4564 free_extent_map(em);
4568 static void *merge_stripe_index_into_bio_private(void *bi_private,
4569 unsigned int stripe_index)
4572 * with single, dup, RAID0, RAID1 and RAID10, stripe_index is
4574 * The alternative solution (instead of stealing bits from the
4575 * pointer) would be to allocate an intermediate structure
4576 * that contains the old private pointer plus the stripe_index.
4578 BUG_ON((((uintptr_t)bi_private) & 3) != 0);
4579 BUG_ON(stripe_index > 3);
4580 return (void *)(((uintptr_t)bi_private) | stripe_index);
4583 static struct btrfs_bio *extract_bbio_from_bio_private(void *bi_private)
4585 return (struct btrfs_bio *)(((uintptr_t)bi_private) & ~((uintptr_t)3));
4588 static unsigned int extract_stripe_index_from_bio_private(void *bi_private)
4590 return (unsigned int)((uintptr_t)bi_private) & 3;
4593 static void btrfs_end_bio(struct bio *bio, int err)
4595 struct btrfs_bio *bbio = extract_bbio_from_bio_private(bio->bi_private);
4596 int is_orig_bio = 0;
4599 atomic_inc(&bbio->error);
4600 if (err == -EIO || err == -EREMOTEIO) {
4601 unsigned int stripe_index =
4602 extract_stripe_index_from_bio_private(
4604 struct btrfs_device *dev;
4606 BUG_ON(stripe_index >= bbio->num_stripes);
4607 dev = bbio->stripes[stripe_index].dev;
4609 if (bio->bi_rw & WRITE)
4610 btrfs_dev_stat_inc(dev,
4611 BTRFS_DEV_STAT_WRITE_ERRS);
4613 btrfs_dev_stat_inc(dev,
4614 BTRFS_DEV_STAT_READ_ERRS);
4615 if ((bio->bi_rw & WRITE_FLUSH) == WRITE_FLUSH)
4616 btrfs_dev_stat_inc(dev,
4617 BTRFS_DEV_STAT_FLUSH_ERRS);
4618 btrfs_dev_stat_print_on_error(dev);
4623 if (bio == bbio->orig_bio)
4626 if (atomic_dec_and_test(&bbio->stripes_pending)) {
4629 bio = bbio->orig_bio;
4631 bio->bi_private = bbio->private;
4632 bio->bi_end_io = bbio->end_io;
4633 bio->bi_bdev = (struct block_device *)
4634 (unsigned long)bbio->mirror_num;
4635 /* only send an error to the higher layers if it is
4636 * beyond the tolerance of the multi-bio
4638 if (atomic_read(&bbio->error) > bbio->max_errors) {
4642 * this bio is actually up to date, we didn't
4643 * go over the max number of errors
4645 set_bit(BIO_UPTODATE, &bio->bi_flags);
4650 bio_endio(bio, err);
4651 } else if (!is_orig_bio) {
4656 struct async_sched {
4659 struct btrfs_fs_info *info;
4660 struct btrfs_work work;
4664 * see run_scheduled_bios for a description of why bios are collected for
4667 * This will add one bio to the pending list for a device and make sure
4668 * the work struct is scheduled.
4670 static noinline void schedule_bio(struct btrfs_root *root,
4671 struct btrfs_device *device,
4672 int rw, struct bio *bio)
4674 int should_queue = 1;
4675 struct btrfs_pending_bios *pending_bios;
4677 /* don't bother with additional async steps for reads, right now */
4678 if (!(rw & REQ_WRITE)) {
4680 btrfsic_submit_bio(rw, bio);
4686 * nr_async_bios allows us to reliably return congestion to the
4687 * higher layers. Otherwise, the async bio makes it appear we have
4688 * made progress against dirty pages when we've really just put it
4689 * on a queue for later
4691 atomic_inc(&root->fs_info->nr_async_bios);
4692 WARN_ON(bio->bi_next);
4693 bio->bi_next = NULL;
4696 spin_lock(&device->io_lock);
4697 if (bio->bi_rw & REQ_SYNC)
4698 pending_bios = &device->pending_sync_bios;
4700 pending_bios = &device->pending_bios;
4702 if (pending_bios->tail)
4703 pending_bios->tail->bi_next = bio;
4705 pending_bios->tail = bio;
4706 if (!pending_bios->head)
4707 pending_bios->head = bio;
4708 if (device->running_pending)
4711 spin_unlock(&device->io_lock);
4714 btrfs_queue_worker(&root->fs_info->submit_workers,
4718 static int bio_size_ok(struct block_device *bdev, struct bio *bio,
4721 struct bio_vec *prev;
4722 struct request_queue *q = bdev_get_queue(bdev);
4723 unsigned short max_sectors = queue_max_sectors(q);
4724 struct bvec_merge_data bvm = {
4726 .bi_sector = sector,
4727 .bi_rw = bio->bi_rw,
4730 if (bio->bi_vcnt == 0) {
4735 prev = &bio->bi_io_vec[bio->bi_vcnt - 1];
4736 if ((bio->bi_size >> 9) > max_sectors)
4739 if (!q->merge_bvec_fn)
4742 bvm.bi_size = bio->bi_size - prev->bv_len;
4743 if (q->merge_bvec_fn(q, &bvm, prev) < prev->bv_len)
4748 static void submit_stripe_bio(struct btrfs_root *root, struct btrfs_bio *bbio,
4749 struct bio *bio, u64 physical, int dev_nr,
4752 struct btrfs_device *dev = bbio->stripes[dev_nr].dev;
4754 bio->bi_private = bbio;
4755 bio->bi_private = merge_stripe_index_into_bio_private(
4756 bio->bi_private, (unsigned int)dev_nr);
4757 bio->bi_end_io = btrfs_end_bio;
4758 bio->bi_sector = physical >> 9;
4761 struct rcu_string *name;
4764 name = rcu_dereference(dev->name);
4765 pr_debug("btrfs_map_bio: rw %d, sector=%llu, dev=%lu "
4766 "(%s id %llu), size=%u\n", rw,
4767 (u64)bio->bi_sector, (u_long)dev->bdev->bd_dev,
4768 name->str, dev->devid, bio->bi_size);
4772 bio->bi_bdev = dev->bdev;
4774 schedule_bio(root, dev, rw, bio);
4776 btrfsic_submit_bio(rw, bio);
4779 static int breakup_stripe_bio(struct btrfs_root *root, struct btrfs_bio *bbio,
4780 struct bio *first_bio, struct btrfs_device *dev,
4781 int dev_nr, int rw, int async)
4783 struct bio_vec *bvec = first_bio->bi_io_vec;
4785 int nr_vecs = bio_get_nr_vecs(dev->bdev);
4786 u64 physical = bbio->stripes[dev_nr].physical;
4789 bio = btrfs_bio_alloc(dev->bdev, physical >> 9, nr_vecs, GFP_NOFS);
4793 while (bvec <= (first_bio->bi_io_vec + first_bio->bi_vcnt - 1)) {
4794 if (bio_add_page(bio, bvec->bv_page, bvec->bv_len,
4795 bvec->bv_offset) < bvec->bv_len) {
4796 u64 len = bio->bi_size;
4798 atomic_inc(&bbio->stripes_pending);
4799 submit_stripe_bio(root, bbio, bio, physical, dev_nr,
4807 submit_stripe_bio(root, bbio, bio, physical, dev_nr, rw, async);
4811 static void bbio_error(struct btrfs_bio *bbio, struct bio *bio, u64 logical)
4813 atomic_inc(&bbio->error);
4814 if (atomic_dec_and_test(&bbio->stripes_pending)) {
4815 bio->bi_private = bbio->private;
4816 bio->bi_end_io = bbio->end_io;
4817 bio->bi_bdev = (struct block_device *)
4818 (unsigned long)bbio->mirror_num;
4819 bio->bi_sector = logical >> 9;
4821 bio_endio(bio, -EIO);
4825 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
4826 int mirror_num, int async_submit)
4828 struct btrfs_device *dev;
4829 struct bio *first_bio = bio;
4830 u64 logical = (u64)bio->bi_sector << 9;
4836 struct btrfs_bio *bbio = NULL;
4838 length = bio->bi_size;
4839 map_length = length;
4841 ret = btrfs_map_block(root->fs_info, rw, logical, &map_length, &bbio,
4846 total_devs = bbio->num_stripes;
4847 if (map_length < length) {
4848 printk(KERN_CRIT "btrfs: mapping failed logical %llu bio len %llu "
4849 "len %llu\n", (unsigned long long)logical,
4850 (unsigned long long)length,
4851 (unsigned long long)map_length);
4855 bbio->orig_bio = first_bio;
4856 bbio->private = first_bio->bi_private;
4857 bbio->end_io = first_bio->bi_end_io;
4858 atomic_set(&bbio->stripes_pending, bbio->num_stripes);
4860 while (dev_nr < total_devs) {
4861 dev = bbio->stripes[dev_nr].dev;
4862 if (!dev || !dev->bdev || (rw & WRITE && !dev->writeable)) {
4863 bbio_error(bbio, first_bio, logical);
4869 * Check and see if we're ok with this bio based on it's size
4870 * and offset with the given device.
4872 if (!bio_size_ok(dev->bdev, first_bio,
4873 bbio->stripes[dev_nr].physical >> 9)) {
4874 ret = breakup_stripe_bio(root, bbio, first_bio, dev,
4875 dev_nr, rw, async_submit);
4881 if (dev_nr < total_devs - 1) {
4882 bio = bio_clone(first_bio, GFP_NOFS);
4883 BUG_ON(!bio); /* -ENOMEM */
4888 submit_stripe_bio(root, bbio, bio,
4889 bbio->stripes[dev_nr].physical, dev_nr, rw,
4896 struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
4899 struct btrfs_device *device;
4900 struct btrfs_fs_devices *cur_devices;
4902 cur_devices = fs_info->fs_devices;
4903 while (cur_devices) {
4905 !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) {
4906 device = __find_device(&cur_devices->devices,
4911 cur_devices = cur_devices->seed;
4916 static struct btrfs_device *add_missing_dev(struct btrfs_root *root,
4917 u64 devid, u8 *dev_uuid)
4919 struct btrfs_device *device;
4920 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
4922 device = kzalloc(sizeof(*device), GFP_NOFS);
4925 list_add(&device->dev_list,
4926 &fs_devices->devices);
4927 device->dev_root = root->fs_info->dev_root;
4928 device->devid = devid;
4929 device->work.func = pending_bios_fn;
4930 device->fs_devices = fs_devices;
4931 device->missing = 1;
4932 fs_devices->num_devices++;
4933 fs_devices->missing_devices++;
4934 spin_lock_init(&device->io_lock);
4935 INIT_LIST_HEAD(&device->dev_alloc_list);
4936 memcpy(device->uuid, dev_uuid, BTRFS_UUID_SIZE);
4940 static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
4941 struct extent_buffer *leaf,
4942 struct btrfs_chunk *chunk)
4944 struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree;
4945 struct map_lookup *map;
4946 struct extent_map *em;
4950 u8 uuid[BTRFS_UUID_SIZE];
4955 logical = key->offset;
4956 length = btrfs_chunk_length(leaf, chunk);
4958 read_lock(&map_tree->map_tree.lock);
4959 em = lookup_extent_mapping(&map_tree->map_tree, logical, 1);
4960 read_unlock(&map_tree->map_tree.lock);
4962 /* already mapped? */
4963 if (em && em->start <= logical && em->start + em->len > logical) {
4964 free_extent_map(em);
4967 free_extent_map(em);
4970 em = alloc_extent_map();
4973 num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
4974 map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
4976 free_extent_map(em);
4980 em->bdev = (struct block_device *)map;
4981 em->start = logical;
4984 em->block_start = 0;
4985 em->block_len = em->len;
4987 map->num_stripes = num_stripes;
4988 map->io_width = btrfs_chunk_io_width(leaf, chunk);
4989 map->io_align = btrfs_chunk_io_align(leaf, chunk);
4990 map->sector_size = btrfs_chunk_sector_size(leaf, chunk);
4991 map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
4992 map->type = btrfs_chunk_type(leaf, chunk);
4993 map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);
4994 for (i = 0; i < num_stripes; i++) {
4995 map->stripes[i].physical =
4996 btrfs_stripe_offset_nr(leaf, chunk, i);
4997 devid = btrfs_stripe_devid_nr(leaf, chunk, i);
4998 read_extent_buffer(leaf, uuid, (unsigned long)
4999 btrfs_stripe_dev_uuid_nr(chunk, i),
5001 map->stripes[i].dev = btrfs_find_device(root->fs_info, devid,
5003 if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) {
5005 free_extent_map(em);
5008 if (!map->stripes[i].dev) {
5009 map->stripes[i].dev =
5010 add_missing_dev(root, devid, uuid);
5011 if (!map->stripes[i].dev) {
5013 free_extent_map(em);
5017 map->stripes[i].dev->in_fs_metadata = 1;
5020 write_lock(&map_tree->map_tree.lock);
5021 ret = add_extent_mapping(&map_tree->map_tree, em);
5022 write_unlock(&map_tree->map_tree.lock);
5023 BUG_ON(ret); /* Tree corruption */
5024 free_extent_map(em);
5029 static void fill_device_from_item(struct extent_buffer *leaf,
5030 struct btrfs_dev_item *dev_item,
5031 struct btrfs_device *device)
5035 device->devid = btrfs_device_id(leaf, dev_item);
5036 device->disk_total_bytes = btrfs_device_total_bytes(leaf, dev_item);
5037 device->total_bytes = device->disk_total_bytes;
5038 device->bytes_used = btrfs_device_bytes_used(leaf, dev_item);
5039 device->type = btrfs_device_type(leaf, dev_item);
5040 device->io_align = btrfs_device_io_align(leaf, dev_item);
5041 device->io_width = btrfs_device_io_width(leaf, dev_item);
5042 device->sector_size = btrfs_device_sector_size(leaf, dev_item);
5043 WARN_ON(device->devid == BTRFS_DEV_REPLACE_DEVID);
5044 device->is_tgtdev_for_dev_replace = 0;
5046 ptr = (unsigned long)btrfs_device_uuid(dev_item);
5047 read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE);
5050 static int open_seed_devices(struct btrfs_root *root, u8 *fsid)
5052 struct btrfs_fs_devices *fs_devices;
5055 BUG_ON(!mutex_is_locked(&uuid_mutex));
5057 fs_devices = root->fs_info->fs_devices->seed;
5058 while (fs_devices) {
5059 if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE)) {
5063 fs_devices = fs_devices->seed;
5066 fs_devices = find_fsid(fsid);
5072 fs_devices = clone_fs_devices(fs_devices);
5073 if (IS_ERR(fs_devices)) {
5074 ret = PTR_ERR(fs_devices);
5078 ret = __btrfs_open_devices(fs_devices, FMODE_READ,
5079 root->fs_info->bdev_holder);
5081 free_fs_devices(fs_devices);
5085 if (!fs_devices->seeding) {
5086 __btrfs_close_devices(fs_devices);
5087 free_fs_devices(fs_devices);
5092 fs_devices->seed = root->fs_info->fs_devices->seed;
5093 root->fs_info->fs_devices->seed = fs_devices;
5098 static int read_one_dev(struct btrfs_root *root,
5099 struct extent_buffer *leaf,
5100 struct btrfs_dev_item *dev_item)
5102 struct btrfs_device *device;
5105 u8 fs_uuid[BTRFS_UUID_SIZE];
5106 u8 dev_uuid[BTRFS_UUID_SIZE];
5108 devid = btrfs_device_id(leaf, dev_item);
5109 read_extent_buffer(leaf, dev_uuid,
5110 (unsigned long)btrfs_device_uuid(dev_item),
5112 read_extent_buffer(leaf, fs_uuid,
5113 (unsigned long)btrfs_device_fsid(dev_item),
5116 if (memcmp(fs_uuid, root->fs_info->fsid, BTRFS_UUID_SIZE)) {
5117 ret = open_seed_devices(root, fs_uuid);
5118 if (ret && !btrfs_test_opt(root, DEGRADED))
5122 device = btrfs_find_device(root->fs_info, devid, dev_uuid, fs_uuid);
5123 if (!device || !device->bdev) {
5124 if (!btrfs_test_opt(root, DEGRADED))
5128 printk(KERN_WARNING "warning devid %llu missing\n",
5129 (unsigned long long)devid);
5130 device = add_missing_dev(root, devid, dev_uuid);
5133 } else if (!device->missing) {
5135 * this happens when a device that was properly setup
5136 * in the device info lists suddenly goes bad.
5137 * device->bdev is NULL, and so we have to set
5138 * device->missing to one here
5140 root->fs_info->fs_devices->missing_devices++;
5141 device->missing = 1;
5145 if (device->fs_devices != root->fs_info->fs_devices) {
5146 BUG_ON(device->writeable);
5147 if (device->generation !=
5148 btrfs_device_generation(leaf, dev_item))
5152 fill_device_from_item(leaf, dev_item, device);
5153 device->dev_root = root->fs_info->dev_root;
5154 device->in_fs_metadata = 1;
5155 if (device->writeable && !device->is_tgtdev_for_dev_replace) {
5156 device->fs_devices->total_rw_bytes += device->total_bytes;
5157 spin_lock(&root->fs_info->free_chunk_lock);
5158 root->fs_info->free_chunk_space += device->total_bytes -
5160 spin_unlock(&root->fs_info->free_chunk_lock);
5166 int btrfs_read_sys_array(struct btrfs_root *root)
5168 struct btrfs_super_block *super_copy = root->fs_info->super_copy;
5169 struct extent_buffer *sb;
5170 struct btrfs_disk_key *disk_key;
5171 struct btrfs_chunk *chunk;
5173 unsigned long sb_ptr;
5179 struct btrfs_key key;
5181 sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET,
5182 BTRFS_SUPER_INFO_SIZE);
5185 btrfs_set_buffer_uptodate(sb);
5186 btrfs_set_buffer_lockdep_class(root->root_key.objectid, sb, 0);
5188 * The sb extent buffer is artifical and just used to read the system array.
5189 * btrfs_set_buffer_uptodate() call does not properly mark all it's
5190 * pages up-to-date when the page is larger: extent does not cover the
5191 * whole page and consequently check_page_uptodate does not find all
5192 * the page's extents up-to-date (the hole beyond sb),
5193 * write_extent_buffer then triggers a WARN_ON.
5195 * Regular short extents go through mark_extent_buffer_dirty/writeback cycle,
5196 * but sb spans only this function. Add an explicit SetPageUptodate call
5197 * to silence the warning eg. on PowerPC 64.
5199 if (PAGE_CACHE_SIZE > BTRFS_SUPER_INFO_SIZE)
5200 SetPageUptodate(sb->pages[0]);
5202 write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE);
5203 array_size = btrfs_super_sys_array_size(super_copy);
5205 ptr = super_copy->sys_chunk_array;
5206 sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array);
5209 while (cur < array_size) {
5210 disk_key = (struct btrfs_disk_key *)ptr;
5211 btrfs_disk_key_to_cpu(&key, disk_key);
5213 len = sizeof(*disk_key); ptr += len;
5217 if (key.type == BTRFS_CHUNK_ITEM_KEY) {
5218 chunk = (struct btrfs_chunk *)sb_ptr;
5219 ret = read_one_chunk(root, &key, sb, chunk);
5222 num_stripes = btrfs_chunk_num_stripes(sb, chunk);
5223 len = btrfs_chunk_item_size(num_stripes);
5232 free_extent_buffer(sb);
5236 int btrfs_read_chunk_tree(struct btrfs_root *root)
5238 struct btrfs_path *path;
5239 struct extent_buffer *leaf;
5240 struct btrfs_key key;
5241 struct btrfs_key found_key;
5245 root = root->fs_info->chunk_root;
5247 path = btrfs_alloc_path();
5251 mutex_lock(&uuid_mutex);
5254 /* first we search for all of the device items, and then we
5255 * read in all of the chunk items. This way we can create chunk
5256 * mappings that reference all of the devices that are afound
5258 key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
5262 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
5266 leaf = path->nodes[0];
5267 slot = path->slots[0];
5268 if (slot >= btrfs_header_nritems(leaf)) {
5269 ret = btrfs_next_leaf(root, path);
5276 btrfs_item_key_to_cpu(leaf, &found_key, slot);
5277 if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) {
5278 if (found_key.objectid != BTRFS_DEV_ITEMS_OBJECTID)
5280 if (found_key.type == BTRFS_DEV_ITEM_KEY) {
5281 struct btrfs_dev_item *dev_item;
5282 dev_item = btrfs_item_ptr(leaf, slot,
5283 struct btrfs_dev_item);
5284 ret = read_one_dev(root, leaf, dev_item);
5288 } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) {
5289 struct btrfs_chunk *chunk;
5290 chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
5291 ret = read_one_chunk(root, &found_key, leaf, chunk);
5297 if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) {
5299 btrfs_release_path(path);
5304 unlock_chunks(root);
5305 mutex_unlock(&uuid_mutex);
5307 btrfs_free_path(path);
5311 static void __btrfs_reset_dev_stats(struct btrfs_device *dev)
5315 for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++)
5316 btrfs_dev_stat_reset(dev, i);
5319 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info)
5321 struct btrfs_key key;
5322 struct btrfs_key found_key;
5323 struct btrfs_root *dev_root = fs_info->dev_root;
5324 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
5325 struct extent_buffer *eb;
5328 struct btrfs_device *device;
5329 struct btrfs_path *path = NULL;
5332 path = btrfs_alloc_path();
5338 mutex_lock(&fs_devices->device_list_mutex);
5339 list_for_each_entry(device, &fs_devices->devices, dev_list) {
5341 struct btrfs_dev_stats_item *ptr;
5344 key.type = BTRFS_DEV_STATS_KEY;
5345 key.offset = device->devid;
5346 ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0);
5348 __btrfs_reset_dev_stats(device);
5349 device->dev_stats_valid = 1;
5350 btrfs_release_path(path);
5353 slot = path->slots[0];
5354 eb = path->nodes[0];
5355 btrfs_item_key_to_cpu(eb, &found_key, slot);
5356 item_size = btrfs_item_size_nr(eb, slot);
5358 ptr = btrfs_item_ptr(eb, slot,
5359 struct btrfs_dev_stats_item);
5361 for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) {
5362 if (item_size >= (1 + i) * sizeof(__le64))
5363 btrfs_dev_stat_set(device, i,
5364 btrfs_dev_stats_value(eb, ptr, i));
5366 btrfs_dev_stat_reset(device, i);
5369 device->dev_stats_valid = 1;
5370 btrfs_dev_stat_print_on_load(device);
5371 btrfs_release_path(path);
5373 mutex_unlock(&fs_devices->device_list_mutex);
5376 btrfs_free_path(path);
5377 return ret < 0 ? ret : 0;
5380 static int update_dev_stat_item(struct btrfs_trans_handle *trans,
5381 struct btrfs_root *dev_root,
5382 struct btrfs_device *device)
5384 struct btrfs_path *path;
5385 struct btrfs_key key;
5386 struct extent_buffer *eb;
5387 struct btrfs_dev_stats_item *ptr;
5392 key.type = BTRFS_DEV_STATS_KEY;
5393 key.offset = device->devid;
5395 path = btrfs_alloc_path();
5397 ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1);
5399 printk_in_rcu(KERN_WARNING "btrfs: error %d while searching for dev_stats item for device %s!\n",
5400 ret, rcu_str_deref(device->name));
5405 btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) {
5406 /* need to delete old one and insert a new one */
5407 ret = btrfs_del_item(trans, dev_root, path);
5409 printk_in_rcu(KERN_WARNING "btrfs: delete too small dev_stats item for device %s failed %d!\n",
5410 rcu_str_deref(device->name), ret);
5417 /* need to insert a new item */
5418 btrfs_release_path(path);
5419 ret = btrfs_insert_empty_item(trans, dev_root, path,
5420 &key, sizeof(*ptr));
5422 printk_in_rcu(KERN_WARNING "btrfs: insert dev_stats item for device %s failed %d!\n",
5423 rcu_str_deref(device->name), ret);
5428 eb = path->nodes[0];
5429 ptr = btrfs_item_ptr(eb, path->slots[0], struct btrfs_dev_stats_item);
5430 for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++)
5431 btrfs_set_dev_stats_value(eb, ptr, i,
5432 btrfs_dev_stat_read(device, i));
5433 btrfs_mark_buffer_dirty(eb);
5436 btrfs_free_path(path);
5441 * called from commit_transaction. Writes all changed device stats to disk.
5443 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
5444 struct btrfs_fs_info *fs_info)
5446 struct btrfs_root *dev_root = fs_info->dev_root;
5447 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
5448 struct btrfs_device *device;
5451 mutex_lock(&fs_devices->device_list_mutex);
5452 list_for_each_entry(device, &fs_devices->devices, dev_list) {
5453 if (!device->dev_stats_valid || !device->dev_stats_dirty)
5456 ret = update_dev_stat_item(trans, dev_root, device);
5458 device->dev_stats_dirty = 0;
5460 mutex_unlock(&fs_devices->device_list_mutex);
5465 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index)
5467 btrfs_dev_stat_inc(dev, index);
5468 btrfs_dev_stat_print_on_error(dev);
5471 void btrfs_dev_stat_print_on_error(struct btrfs_device *dev)
5473 if (!dev->dev_stats_valid)
5475 printk_ratelimited_in_rcu(KERN_ERR
5476 "btrfs: bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n",
5477 rcu_str_deref(dev->name),
5478 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS),
5479 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS),
5480 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS),
5481 btrfs_dev_stat_read(dev,
5482 BTRFS_DEV_STAT_CORRUPTION_ERRS),
5483 btrfs_dev_stat_read(dev,
5484 BTRFS_DEV_STAT_GENERATION_ERRS));
5487 static void btrfs_dev_stat_print_on_load(struct btrfs_device *dev)
5491 for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++)
5492 if (btrfs_dev_stat_read(dev, i) != 0)
5494 if (i == BTRFS_DEV_STAT_VALUES_MAX)
5495 return; /* all values == 0, suppress message */
5497 printk_in_rcu(KERN_INFO "btrfs: bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n",
5498 rcu_str_deref(dev->name),
5499 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS),
5500 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS),
5501 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS),
5502 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_CORRUPTION_ERRS),
5503 btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_GENERATION_ERRS));
5506 int btrfs_get_dev_stats(struct btrfs_root *root,
5507 struct btrfs_ioctl_get_dev_stats *stats)
5509 struct btrfs_device *dev;
5510 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
5513 mutex_lock(&fs_devices->device_list_mutex);
5514 dev = btrfs_find_device(root->fs_info, stats->devid, NULL, NULL);
5515 mutex_unlock(&fs_devices->device_list_mutex);
5519 "btrfs: get dev_stats failed, device not found\n");
5521 } else if (!dev->dev_stats_valid) {
5523 "btrfs: get dev_stats failed, not yet valid\n");
5525 } else if (stats->flags & BTRFS_DEV_STATS_RESET) {
5526 for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) {
5527 if (stats->nr_items > i)
5529 btrfs_dev_stat_read_and_reset(dev, i);
5531 btrfs_dev_stat_reset(dev, i);
5534 for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++)
5535 if (stats->nr_items > i)
5536 stats->values[i] = btrfs_dev_stat_read(dev, i);
5538 if (stats->nr_items > BTRFS_DEV_STAT_VALUES_MAX)
5539 stats->nr_items = BTRFS_DEV_STAT_VALUES_MAX;
5543 int btrfs_scratch_superblock(struct btrfs_device *device)
5545 struct buffer_head *bh;
5546 struct btrfs_super_block *disk_super;
5548 bh = btrfs_read_dev_super(device->bdev);
5551 disk_super = (struct btrfs_super_block *)bh->b_data;
5553 memset(&disk_super->magic, 0, sizeof(disk_super->magic));
5554 set_buffer_dirty(bh);
5555 sync_dirty_buffer(bh);