1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2007 Oracle. All rights reserved.
6 #include <linux/sched.h>
7 #include <linux/sched/mm.h>
8 #include <linux/slab.h>
9 #include <linux/ratelimit.h>
10 #include <linux/kthread.h>
11 #include <linux/semaphore.h>
12 #include <linux/uuid.h>
13 #include <linux/list_sort.h>
14 #include <linux/namei.h>
18 #include "transaction.h"
21 #include "rcu-string.h"
22 #include "dev-replace.h"
24 #include "tree-checker.h"
25 #include "space-info.h"
26 #include "block-group.h"
30 #include "accessors.h"
31 #include "uuid-tree.h"
33 #include "relocation.h"
36 #include "raid-stripe-tree.h"
38 #define BTRFS_BLOCK_GROUP_STRIPE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
39 BTRFS_BLOCK_GROUP_RAID10 | \
40 BTRFS_BLOCK_GROUP_RAID56_MASK)
42 struct btrfs_io_geometry
{
48 u64 raid56_full_stripe_start
;
53 const struct btrfs_raid_attr btrfs_raid_array
[BTRFS_NR_RAID_TYPES
] = {
54 [BTRFS_RAID_RAID10
] = {
57 .devs_max
= 0, /* 0 == as many as possible */
59 .tolerated_failures
= 1,
63 .raid_name
= "raid10",
64 .bg_flag
= BTRFS_BLOCK_GROUP_RAID10
,
65 .mindev_error
= BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET
,
67 [BTRFS_RAID_RAID1
] = {
72 .tolerated_failures
= 1,
77 .bg_flag
= BTRFS_BLOCK_GROUP_RAID1
,
78 .mindev_error
= BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET
,
80 [BTRFS_RAID_RAID1C3
] = {
85 .tolerated_failures
= 2,
89 .raid_name
= "raid1c3",
90 .bg_flag
= BTRFS_BLOCK_GROUP_RAID1C3
,
91 .mindev_error
= BTRFS_ERROR_DEV_RAID1C3_MIN_NOT_MET
,
93 [BTRFS_RAID_RAID1C4
] = {
98 .tolerated_failures
= 3,
102 .raid_name
= "raid1c4",
103 .bg_flag
= BTRFS_BLOCK_GROUP_RAID1C4
,
104 .mindev_error
= BTRFS_ERROR_DEV_RAID1C4_MIN_NOT_MET
,
111 .tolerated_failures
= 0,
116 .bg_flag
= BTRFS_BLOCK_GROUP_DUP
,
119 [BTRFS_RAID_RAID0
] = {
124 .tolerated_failures
= 0,
128 .raid_name
= "raid0",
129 .bg_flag
= BTRFS_BLOCK_GROUP_RAID0
,
132 [BTRFS_RAID_SINGLE
] = {
137 .tolerated_failures
= 0,
141 .raid_name
= "single",
145 [BTRFS_RAID_RAID5
] = {
150 .tolerated_failures
= 1,
154 .raid_name
= "raid5",
155 .bg_flag
= BTRFS_BLOCK_GROUP_RAID5
,
156 .mindev_error
= BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET
,
158 [BTRFS_RAID_RAID6
] = {
163 .tolerated_failures
= 2,
167 .raid_name
= "raid6",
168 .bg_flag
= BTRFS_BLOCK_GROUP_RAID6
,
169 .mindev_error
= BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET
,
174 * Convert block group flags (BTRFS_BLOCK_GROUP_*) to btrfs_raid_types, which
175 * can be used as index to access btrfs_raid_array[].
177 enum btrfs_raid_types __attribute_const__
btrfs_bg_flags_to_raid_index(u64 flags
)
179 const u64 profile
= (flags
& BTRFS_BLOCK_GROUP_PROFILE_MASK
);
182 return BTRFS_RAID_SINGLE
;
184 return BTRFS_BG_FLAG_TO_INDEX(profile
);
187 const char *btrfs_bg_type_to_raid_name(u64 flags
)
189 const int index
= btrfs_bg_flags_to_raid_index(flags
);
191 if (index
>= BTRFS_NR_RAID_TYPES
)
194 return btrfs_raid_array
[index
].raid_name
;
197 int btrfs_nr_parity_stripes(u64 type
)
199 enum btrfs_raid_types index
= btrfs_bg_flags_to_raid_index(type
);
201 return btrfs_raid_array
[index
].nparity
;
205 * Fill @buf with textual description of @bg_flags, no more than @size_buf
206 * bytes including terminating null byte.
208 void btrfs_describe_block_groups(u64 bg_flags
, char *buf
, u32 size_buf
)
213 u64 flags
= bg_flags
;
214 u32 size_bp
= size_buf
;
221 #define DESCRIBE_FLAG(flag, desc) \
223 if (flags & (flag)) { \
224 ret = snprintf(bp, size_bp, "%s|", (desc)); \
225 if (ret < 0 || ret >= size_bp) \
233 DESCRIBE_FLAG(BTRFS_BLOCK_GROUP_DATA
, "data");
234 DESCRIBE_FLAG(BTRFS_BLOCK_GROUP_SYSTEM
, "system");
235 DESCRIBE_FLAG(BTRFS_BLOCK_GROUP_METADATA
, "metadata");
237 DESCRIBE_FLAG(BTRFS_AVAIL_ALLOC_BIT_SINGLE
, "single");
238 for (i
= 0; i
< BTRFS_NR_RAID_TYPES
; i
++)
239 DESCRIBE_FLAG(btrfs_raid_array
[i
].bg_flag
,
240 btrfs_raid_array
[i
].raid_name
);
244 ret
= snprintf(bp
, size_bp
, "0x%llx|", flags
);
248 if (size_bp
< size_buf
)
249 buf
[size_buf
- size_bp
- 1] = '\0'; /* remove last | */
252 * The text is trimmed, it's up to the caller to provide sufficiently
258 static int init_first_rw_device(struct btrfs_trans_handle
*trans
);
259 static int btrfs_relocate_sys_chunks(struct btrfs_fs_info
*fs_info
);
260 static void btrfs_dev_stat_print_on_load(struct btrfs_device
*device
);
266 * There are several mutexes that protect manipulation of devices and low-level
267 * structures like chunks but not block groups, extents or files
269 * uuid_mutex (global lock)
270 * ------------------------
271 * protects the fs_uuids list that tracks all per-fs fs_devices, resulting from
272 * the SCAN_DEV ioctl registration or from mount either implicitly (the first
273 * device) or requested by the device= mount option
275 * the mutex can be very coarse and can cover long-running operations
277 * protects: updates to fs_devices counters like missing devices, rw devices,
278 * seeding, structure cloning, opening/closing devices at mount/umount time
280 * global::fs_devs - add, remove, updates to the global list
282 * does not protect: manipulation of the fs_devices::devices list in general
283 * but in mount context it could be used to exclude list modifications by eg.
286 * btrfs_device::name - renames (write side), read is RCU
288 * fs_devices::device_list_mutex (per-fs, with RCU)
289 * ------------------------------------------------
290 * protects updates to fs_devices::devices, ie. adding and deleting
292 * simple list traversal with read-only actions can be done with RCU protection
294 * may be used to exclude some operations from running concurrently without any
295 * modifications to the list (see write_all_supers)
297 * Is not required at mount and close times, because our device list is
298 * protected by the uuid_mutex at that point.
302 * protects balance structures (status, state) and context accessed from
303 * several places (internally, ioctl)
307 * protects chunks, adding or removing during allocation, trim or when a new
308 * device is added/removed. Additionally it also protects post_commit_list of
309 * individual devices, since they can be added to the transaction's
310 * post_commit_list only with chunk_mutex held.
314 * a big lock that is held by the cleaner thread and prevents running subvolume
315 * cleaning together with relocation or delayed iputs
327 * Exclusive operations
328 * ====================
330 * Maintains the exclusivity of the following operations that apply to the
331 * whole filesystem and cannot run in parallel.
336 * - Device replace (*)
339 * The device operations (as above) can be in one of the following states:
345 * Only device operations marked with (*) can go into the Paused state for the
348 * - ioctl (only Balance can be Paused through ioctl)
349 * - filesystem remounted as read-only
350 * - filesystem unmounted and mounted as read-only
351 * - system power-cycle and filesystem mounted as read-only
352 * - filesystem or device errors leading to forced read-only
354 * The status of exclusive operation is set and cleared atomically.
355 * During the course of Paused state, fs_info::exclusive_operation remains set.
356 * A device operation in Paused or Running state can be canceled or resumed
357 * either by ioctl (Balance only) or when remounted as read-write.
358 * The exclusive status is cleared when the device operation is canceled or
362 DEFINE_MUTEX(uuid_mutex
);
363 static LIST_HEAD(fs_uuids
);
364 struct list_head
* __attribute_const__
btrfs_get_fs_uuids(void)
370 * Allocate new btrfs_fs_devices structure identified by a fsid.
372 * @fsid: if not NULL, copy the UUID to fs_devices::fsid and to
373 * fs_devices::metadata_fsid
375 * Return a pointer to a new struct btrfs_fs_devices on success, or ERR_PTR().
376 * The returned struct is not linked onto any lists and can be destroyed with
377 * kfree() right away.
379 static struct btrfs_fs_devices
*alloc_fs_devices(const u8
*fsid
)
381 struct btrfs_fs_devices
*fs_devs
;
383 fs_devs
= kzalloc(sizeof(*fs_devs
), GFP_KERNEL
);
385 return ERR_PTR(-ENOMEM
);
387 mutex_init(&fs_devs
->device_list_mutex
);
389 INIT_LIST_HEAD(&fs_devs
->devices
);
390 INIT_LIST_HEAD(&fs_devs
->alloc_list
);
391 INIT_LIST_HEAD(&fs_devs
->fs_list
);
392 INIT_LIST_HEAD(&fs_devs
->seed_list
);
395 memcpy(fs_devs
->fsid
, fsid
, BTRFS_FSID_SIZE
);
396 memcpy(fs_devs
->metadata_uuid
, fsid
, BTRFS_FSID_SIZE
);
402 static void btrfs_free_device(struct btrfs_device
*device
)
404 WARN_ON(!list_empty(&device
->post_commit_list
));
405 rcu_string_free(device
->name
);
406 extent_io_tree_release(&device
->alloc_state
);
407 btrfs_destroy_dev_zone_info(device
);
411 static void free_fs_devices(struct btrfs_fs_devices
*fs_devices
)
413 struct btrfs_device
*device
;
415 WARN_ON(fs_devices
->opened
);
416 while (!list_empty(&fs_devices
->devices
)) {
417 device
= list_entry(fs_devices
->devices
.next
,
418 struct btrfs_device
, dev_list
);
419 list_del(&device
->dev_list
);
420 btrfs_free_device(device
);
425 void __exit
btrfs_cleanup_fs_uuids(void)
427 struct btrfs_fs_devices
*fs_devices
;
429 while (!list_empty(&fs_uuids
)) {
430 fs_devices
= list_entry(fs_uuids
.next
,
431 struct btrfs_fs_devices
, fs_list
);
432 list_del(&fs_devices
->fs_list
);
433 free_fs_devices(fs_devices
);
437 static bool match_fsid_fs_devices(const struct btrfs_fs_devices
*fs_devices
,
438 const u8
*fsid
, const u8
*metadata_fsid
)
440 if (memcmp(fsid
, fs_devices
->fsid
, BTRFS_FSID_SIZE
) != 0)
446 if (memcmp(metadata_fsid
, fs_devices
->metadata_uuid
, BTRFS_FSID_SIZE
) != 0)
452 static noinline
struct btrfs_fs_devices
*find_fsid(
453 const u8
*fsid
, const u8
*metadata_fsid
)
455 struct btrfs_fs_devices
*fs_devices
;
459 /* Handle non-split brain cases */
460 list_for_each_entry(fs_devices
, &fs_uuids
, fs_list
) {
461 if (match_fsid_fs_devices(fs_devices
, fsid
, metadata_fsid
))
468 btrfs_get_bdev_and_sb(const char *device_path
, blk_mode_t flags
, void *holder
,
469 int flush
, struct file
**bdev_file
,
470 struct btrfs_super_block
**disk_super
)
472 struct block_device
*bdev
;
475 *bdev_file
= bdev_file_open_by_path(device_path
, flags
, holder
, NULL
);
477 if (IS_ERR(*bdev_file
)) {
478 ret
= PTR_ERR(*bdev_file
);
481 bdev
= file_bdev(*bdev_file
);
485 ret
= set_blocksize(bdev
, BTRFS_BDEV_BLOCKSIZE
);
490 invalidate_bdev(bdev
);
491 *disk_super
= btrfs_read_dev_super(bdev
);
492 if (IS_ERR(*disk_super
)) {
493 ret
= PTR_ERR(*disk_super
);
506 * Search and remove all stale devices (which are not mounted). When both
507 * inputs are NULL, it will search and release all stale devices.
509 * @devt: Optional. When provided will it release all unmounted devices
510 * matching this devt only.
511 * @skip_device: Optional. Will skip this device when searching for the stale
514 * Return: 0 for success or if @devt is 0.
515 * -EBUSY if @devt is a mounted device.
516 * -ENOENT if @devt does not match any device in the list.
518 static int btrfs_free_stale_devices(dev_t devt
, struct btrfs_device
*skip_device
)
520 struct btrfs_fs_devices
*fs_devices
, *tmp_fs_devices
;
521 struct btrfs_device
*device
, *tmp_device
;
525 lockdep_assert_held(&uuid_mutex
);
527 /* Return good status if there is no instance of devt. */
529 list_for_each_entry_safe(fs_devices
, tmp_fs_devices
, &fs_uuids
, fs_list
) {
531 mutex_lock(&fs_devices
->device_list_mutex
);
532 list_for_each_entry_safe(device
, tmp_device
,
533 &fs_devices
->devices
, dev_list
) {
534 if (skip_device
&& skip_device
== device
)
536 if (devt
&& devt
!= device
->devt
)
538 if (fs_devices
->opened
) {
544 /* delete the stale device */
545 fs_devices
->num_devices
--;
546 list_del(&device
->dev_list
);
547 btrfs_free_device(device
);
551 mutex_unlock(&fs_devices
->device_list_mutex
);
553 if (fs_devices
->num_devices
== 0) {
554 btrfs_sysfs_remove_fsid(fs_devices
);
555 list_del(&fs_devices
->fs_list
);
556 free_fs_devices(fs_devices
);
560 /* If there is at least one freed device return 0. */
567 static struct btrfs_fs_devices
*find_fsid_by_device(
568 struct btrfs_super_block
*disk_super
,
569 dev_t devt
, bool *same_fsid_diff_dev
)
571 struct btrfs_fs_devices
*fsid_fs_devices
;
572 struct btrfs_fs_devices
*devt_fs_devices
;
573 const bool has_metadata_uuid
= (btrfs_super_incompat_flags(disk_super
) &
574 BTRFS_FEATURE_INCOMPAT_METADATA_UUID
);
575 bool found_by_devt
= false;
577 /* Find the fs_device by the usual method, if found use it. */
578 fsid_fs_devices
= find_fsid(disk_super
->fsid
,
579 has_metadata_uuid
? disk_super
->metadata_uuid
: NULL
);
581 /* The temp_fsid feature is supported only with single device filesystem. */
582 if (btrfs_super_num_devices(disk_super
) != 1)
583 return fsid_fs_devices
;
586 * A seed device is an integral component of the sprout device, which
587 * functions as a multi-device filesystem. So, temp-fsid feature is
590 if (btrfs_super_flags(disk_super
) & BTRFS_SUPER_FLAG_SEEDING
)
591 return fsid_fs_devices
;
593 /* Try to find a fs_devices by matching devt. */
594 list_for_each_entry(devt_fs_devices
, &fs_uuids
, fs_list
) {
595 struct btrfs_device
*device
;
597 list_for_each_entry(device
, &devt_fs_devices
->devices
, dev_list
) {
598 if (device
->devt
== devt
) {
599 found_by_devt
= true;
608 /* Existing device. */
609 if (fsid_fs_devices
== NULL
) {
610 if (devt_fs_devices
->opened
== 0) {
614 /* temp_fsid is mounting a subvol. */
615 return devt_fs_devices
;
618 /* Regular or temp_fsid device mounting a subvol. */
619 return devt_fs_devices
;
623 if (fsid_fs_devices
== NULL
) {
626 /* sb::fsid is already used create a new temp_fsid. */
627 *same_fsid_diff_dev
= true;
636 * This is only used on mount, and we are protected from competing things
637 * messing with our fs_devices by the uuid_mutex, thus we do not need the
638 * fs_devices->device_list_mutex here.
640 static int btrfs_open_one_device(struct btrfs_fs_devices
*fs_devices
,
641 struct btrfs_device
*device
, blk_mode_t flags
,
644 struct file
*bdev_file
;
645 struct btrfs_super_block
*disk_super
;
654 ret
= btrfs_get_bdev_and_sb(device
->name
->str
, flags
, holder
, 1,
655 &bdev_file
, &disk_super
);
659 devid
= btrfs_stack_device_id(&disk_super
->dev_item
);
660 if (devid
!= device
->devid
)
661 goto error_free_page
;
663 if (memcmp(device
->uuid
, disk_super
->dev_item
.uuid
, BTRFS_UUID_SIZE
))
664 goto error_free_page
;
666 device
->generation
= btrfs_super_generation(disk_super
);
668 if (btrfs_super_flags(disk_super
) & BTRFS_SUPER_FLAG_SEEDING
) {
669 if (btrfs_super_incompat_flags(disk_super
) &
670 BTRFS_FEATURE_INCOMPAT_METADATA_UUID
) {
672 "BTRFS: Invalid seeding and uuid-changed device detected\n");
673 goto error_free_page
;
676 clear_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
);
677 fs_devices
->seeding
= true;
679 if (bdev_read_only(file_bdev(bdev_file
)))
680 clear_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
);
682 set_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
);
685 if (!bdev_nonrot(file_bdev(bdev_file
)))
686 fs_devices
->rotating
= true;
688 if (bdev_max_discard_sectors(file_bdev(bdev_file
)))
689 fs_devices
->discardable
= true;
691 device
->bdev_file
= bdev_file
;
692 device
->bdev
= file_bdev(bdev_file
);
693 clear_bit(BTRFS_DEV_STATE_IN_FS_METADATA
, &device
->dev_state
);
695 if (device
->devt
!= device
->bdev
->bd_dev
) {
697 "device %s maj:min changed from %d:%d to %d:%d",
698 device
->name
->str
, MAJOR(device
->devt
),
699 MINOR(device
->devt
), MAJOR(device
->bdev
->bd_dev
),
700 MINOR(device
->bdev
->bd_dev
));
702 device
->devt
= device
->bdev
->bd_dev
;
705 fs_devices
->open_devices
++;
706 if (test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
) &&
707 device
->devid
!= BTRFS_DEV_REPLACE_DEVID
) {
708 fs_devices
->rw_devices
++;
709 list_add_tail(&device
->dev_alloc_list
, &fs_devices
->alloc_list
);
711 btrfs_release_disk_super(disk_super
);
716 btrfs_release_disk_super(disk_super
);
722 u8
*btrfs_sb_fsid_ptr(struct btrfs_super_block
*sb
)
724 bool has_metadata_uuid
= (btrfs_super_incompat_flags(sb
) &
725 BTRFS_FEATURE_INCOMPAT_METADATA_UUID
);
727 return has_metadata_uuid
? sb
->metadata_uuid
: sb
->fsid
;
731 * Add new device to list of registered devices
734 * device pointer which was just added or updated when successful
735 * error pointer when failed
737 static noinline
struct btrfs_device
*device_list_add(const char *path
,
738 struct btrfs_super_block
*disk_super
,
739 bool *new_device_added
)
741 struct btrfs_device
*device
;
742 struct btrfs_fs_devices
*fs_devices
= NULL
;
743 struct rcu_string
*name
;
744 u64 found_transid
= btrfs_super_generation(disk_super
);
745 u64 devid
= btrfs_stack_device_id(&disk_super
->dev_item
);
748 bool same_fsid_diff_dev
= false;
749 bool has_metadata_uuid
= (btrfs_super_incompat_flags(disk_super
) &
750 BTRFS_FEATURE_INCOMPAT_METADATA_UUID
);
752 if (btrfs_super_flags(disk_super
) & BTRFS_SUPER_FLAG_CHANGING_FSID_V2
) {
754 "device %s has incomplete metadata_uuid change, please use btrfstune to complete",
756 return ERR_PTR(-EAGAIN
);
759 error
= lookup_bdev(path
, &path_devt
);
761 btrfs_err(NULL
, "failed to lookup block device for path %s: %d",
763 return ERR_PTR(error
);
766 fs_devices
= find_fsid_by_device(disk_super
, path_devt
, &same_fsid_diff_dev
);
769 fs_devices
= alloc_fs_devices(disk_super
->fsid
);
770 if (IS_ERR(fs_devices
))
771 return ERR_CAST(fs_devices
);
773 if (has_metadata_uuid
)
774 memcpy(fs_devices
->metadata_uuid
,
775 disk_super
->metadata_uuid
, BTRFS_FSID_SIZE
);
777 if (same_fsid_diff_dev
) {
778 generate_random_uuid(fs_devices
->fsid
);
779 fs_devices
->temp_fsid
= true;
780 pr_info("BTRFS: device %s (%d:%d) using temp-fsid %pU\n",
781 path
, MAJOR(path_devt
), MINOR(path_devt
),
785 mutex_lock(&fs_devices
->device_list_mutex
);
786 list_add(&fs_devices
->fs_list
, &fs_uuids
);
790 struct btrfs_dev_lookup_args args
= {
792 .uuid
= disk_super
->dev_item
.uuid
,
795 mutex_lock(&fs_devices
->device_list_mutex
);
796 device
= btrfs_find_device(fs_devices
, &args
);
798 if (found_transid
> fs_devices
->latest_generation
) {
799 memcpy(fs_devices
->fsid
, disk_super
->fsid
,
801 memcpy(fs_devices
->metadata_uuid
,
802 btrfs_sb_fsid_ptr(disk_super
), BTRFS_FSID_SIZE
);
807 unsigned int nofs_flag
;
809 if (fs_devices
->opened
) {
811 "device %s (%d:%d) belongs to fsid %pU, and the fs is already mounted, scanned by %s (%d)",
812 path
, MAJOR(path_devt
), MINOR(path_devt
),
813 fs_devices
->fsid
, current
->comm
,
814 task_pid_nr(current
));
815 mutex_unlock(&fs_devices
->device_list_mutex
);
816 return ERR_PTR(-EBUSY
);
819 nofs_flag
= memalloc_nofs_save();
820 device
= btrfs_alloc_device(NULL
, &devid
,
821 disk_super
->dev_item
.uuid
, path
);
822 memalloc_nofs_restore(nofs_flag
);
823 if (IS_ERR(device
)) {
824 mutex_unlock(&fs_devices
->device_list_mutex
);
825 /* we can safely leave the fs_devices entry around */
829 device
->devt
= path_devt
;
831 list_add_rcu(&device
->dev_list
, &fs_devices
->devices
);
832 fs_devices
->num_devices
++;
834 device
->fs_devices
= fs_devices
;
835 *new_device_added
= true;
837 if (disk_super
->label
[0])
839 "BTRFS: device label %s devid %llu transid %llu %s (%d:%d) scanned by %s (%d)\n",
840 disk_super
->label
, devid
, found_transid
, path
,
841 MAJOR(path_devt
), MINOR(path_devt
),
842 current
->comm
, task_pid_nr(current
));
845 "BTRFS: device fsid %pU devid %llu transid %llu %s (%d:%d) scanned by %s (%d)\n",
846 disk_super
->fsid
, devid
, found_transid
, path
,
847 MAJOR(path_devt
), MINOR(path_devt
),
848 current
->comm
, task_pid_nr(current
));
850 } else if (!device
->name
|| strcmp(device
->name
->str
, path
)) {
852 * When FS is already mounted.
853 * 1. If you are here and if the device->name is NULL that
854 * means this device was missing at time of FS mount.
855 * 2. If you are here and if the device->name is different
856 * from 'path' that means either
857 * a. The same device disappeared and reappeared with
859 * b. The missing-disk-which-was-replaced, has
862 * We must allow 1 and 2a above. But 2b would be a spurious
865 * Further in case of 1 and 2a above, the disk at 'path'
866 * would have missed some transaction when it was away and
867 * in case of 2a the stale bdev has to be updated as well.
868 * 2b must not be allowed at all time.
872 * For now, we do allow update to btrfs_fs_device through the
873 * btrfs dev scan cli after FS has been mounted. We're still
874 * tracking a problem where systems fail mount by subvolume id
875 * when we reject replacement on a mounted FS.
877 if (!fs_devices
->opened
&& found_transid
< device
->generation
) {
879 * That is if the FS is _not_ mounted and if you
880 * are here, that means there is more than one
881 * disk with same uuid and devid.We keep the one
882 * with larger generation number or the last-in if
883 * generation are equal.
885 mutex_unlock(&fs_devices
->device_list_mutex
);
887 "device %s already registered with a higher generation, found %llu expect %llu",
888 path
, found_transid
, device
->generation
);
889 return ERR_PTR(-EEXIST
);
893 * We are going to replace the device path for a given devid,
894 * make sure it's the same device if the device is mounted
896 * NOTE: the device->fs_info may not be reliable here so pass
897 * in a NULL to message helpers instead. This avoids a possible
898 * use-after-free when the fs_info and fs_info->sb are already
902 if (device
->devt
!= path_devt
) {
903 mutex_unlock(&fs_devices
->device_list_mutex
);
904 btrfs_warn_in_rcu(NULL
,
905 "duplicate device %s devid %llu generation %llu scanned by %s (%d)",
906 path
, devid
, found_transid
,
908 task_pid_nr(current
));
909 return ERR_PTR(-EEXIST
);
911 btrfs_info_in_rcu(NULL
,
912 "devid %llu device path %s changed to %s scanned by %s (%d)",
913 devid
, btrfs_dev_name(device
),
915 task_pid_nr(current
));
918 name
= rcu_string_strdup(path
, GFP_NOFS
);
920 mutex_unlock(&fs_devices
->device_list_mutex
);
921 return ERR_PTR(-ENOMEM
);
923 rcu_string_free(device
->name
);
924 rcu_assign_pointer(device
->name
, name
);
925 if (test_bit(BTRFS_DEV_STATE_MISSING
, &device
->dev_state
)) {
926 fs_devices
->missing_devices
--;
927 clear_bit(BTRFS_DEV_STATE_MISSING
, &device
->dev_state
);
929 device
->devt
= path_devt
;
933 * Unmount does not free the btrfs_device struct but would zero
934 * generation along with most of the other members. So just update
935 * it back. We need it to pick the disk with largest generation
938 if (!fs_devices
->opened
) {
939 device
->generation
= found_transid
;
940 fs_devices
->latest_generation
= max_t(u64
, found_transid
,
941 fs_devices
->latest_generation
);
944 fs_devices
->total_devices
= btrfs_super_num_devices(disk_super
);
946 mutex_unlock(&fs_devices
->device_list_mutex
);
950 static struct btrfs_fs_devices
*clone_fs_devices(struct btrfs_fs_devices
*orig
)
952 struct btrfs_fs_devices
*fs_devices
;
953 struct btrfs_device
*device
;
954 struct btrfs_device
*orig_dev
;
957 lockdep_assert_held(&uuid_mutex
);
959 fs_devices
= alloc_fs_devices(orig
->fsid
);
960 if (IS_ERR(fs_devices
))
963 fs_devices
->total_devices
= orig
->total_devices
;
965 list_for_each_entry(orig_dev
, &orig
->devices
, dev_list
) {
966 const char *dev_path
= NULL
;
969 * This is ok to do without RCU read locked because we hold the
970 * uuid mutex so nothing we touch in here is going to disappear.
973 dev_path
= orig_dev
->name
->str
;
975 device
= btrfs_alloc_device(NULL
, &orig_dev
->devid
,
976 orig_dev
->uuid
, dev_path
);
977 if (IS_ERR(device
)) {
978 ret
= PTR_ERR(device
);
982 if (orig_dev
->zone_info
) {
983 struct btrfs_zoned_device_info
*zone_info
;
985 zone_info
= btrfs_clone_dev_zone_info(orig_dev
);
987 btrfs_free_device(device
);
991 device
->zone_info
= zone_info
;
994 list_add(&device
->dev_list
, &fs_devices
->devices
);
995 device
->fs_devices
= fs_devices
;
996 fs_devices
->num_devices
++;
1000 free_fs_devices(fs_devices
);
1001 return ERR_PTR(ret
);
1004 static void __btrfs_free_extra_devids(struct btrfs_fs_devices
*fs_devices
,
1005 struct btrfs_device
**latest_dev
)
1007 struct btrfs_device
*device
, *next
;
1009 /* This is the initialized path, it is safe to release the devices. */
1010 list_for_each_entry_safe(device
, next
, &fs_devices
->devices
, dev_list
) {
1011 if (test_bit(BTRFS_DEV_STATE_IN_FS_METADATA
, &device
->dev_state
)) {
1012 if (!test_bit(BTRFS_DEV_STATE_REPLACE_TGT
,
1013 &device
->dev_state
) &&
1014 !test_bit(BTRFS_DEV_STATE_MISSING
,
1015 &device
->dev_state
) &&
1017 device
->generation
> (*latest_dev
)->generation
)) {
1018 *latest_dev
= device
;
1024 * We have already validated the presence of BTRFS_DEV_REPLACE_DEVID,
1025 * in btrfs_init_dev_replace() so just continue.
1027 if (device
->devid
== BTRFS_DEV_REPLACE_DEVID
)
1030 if (device
->bdev_file
) {
1031 fput(device
->bdev_file
);
1032 device
->bdev
= NULL
;
1033 device
->bdev_file
= NULL
;
1034 fs_devices
->open_devices
--;
1036 if (test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
)) {
1037 list_del_init(&device
->dev_alloc_list
);
1038 clear_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
);
1039 fs_devices
->rw_devices
--;
1041 list_del_init(&device
->dev_list
);
1042 fs_devices
->num_devices
--;
1043 btrfs_free_device(device
);
1049 * After we have read the system tree and know devids belonging to this
1050 * filesystem, remove the device which does not belong there.
1052 void btrfs_free_extra_devids(struct btrfs_fs_devices
*fs_devices
)
1054 struct btrfs_device
*latest_dev
= NULL
;
1055 struct btrfs_fs_devices
*seed_dev
;
1057 mutex_lock(&uuid_mutex
);
1058 __btrfs_free_extra_devids(fs_devices
, &latest_dev
);
1060 list_for_each_entry(seed_dev
, &fs_devices
->seed_list
, seed_list
)
1061 __btrfs_free_extra_devids(seed_dev
, &latest_dev
);
1063 fs_devices
->latest_dev
= latest_dev
;
1065 mutex_unlock(&uuid_mutex
);
1068 static void btrfs_close_bdev(struct btrfs_device
*device
)
1073 if (test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
)) {
1074 sync_blockdev(device
->bdev
);
1075 invalidate_bdev(device
->bdev
);
1078 fput(device
->bdev_file
);
1081 static void btrfs_close_one_device(struct btrfs_device
*device
)
1083 struct btrfs_fs_devices
*fs_devices
= device
->fs_devices
;
1085 if (test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
) &&
1086 device
->devid
!= BTRFS_DEV_REPLACE_DEVID
) {
1087 list_del_init(&device
->dev_alloc_list
);
1088 fs_devices
->rw_devices
--;
1091 if (device
->devid
== BTRFS_DEV_REPLACE_DEVID
)
1092 clear_bit(BTRFS_DEV_STATE_REPLACE_TGT
, &device
->dev_state
);
1094 if (test_bit(BTRFS_DEV_STATE_MISSING
, &device
->dev_state
)) {
1095 clear_bit(BTRFS_DEV_STATE_MISSING
, &device
->dev_state
);
1096 fs_devices
->missing_devices
--;
1099 btrfs_close_bdev(device
);
1101 fs_devices
->open_devices
--;
1102 device
->bdev
= NULL
;
1104 clear_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
);
1105 btrfs_destroy_dev_zone_info(device
);
1107 device
->fs_info
= NULL
;
1108 atomic_set(&device
->dev_stats_ccnt
, 0);
1109 extent_io_tree_release(&device
->alloc_state
);
1112 * Reset the flush error record. We might have a transient flush error
1113 * in this mount, and if so we aborted the current transaction and set
1114 * the fs to an error state, guaranteeing no super blocks can be further
1115 * committed. However that error might be transient and if we unmount the
1116 * filesystem and mount it again, we should allow the mount to succeed
1117 * (btrfs_check_rw_degradable() should not fail) - if after mounting the
1118 * filesystem again we still get flush errors, then we will again abort
1119 * any transaction and set the error state, guaranteeing no commits of
1120 * unsafe super blocks.
1122 device
->last_flush_error
= 0;
1124 /* Verify the device is back in a pristine state */
1125 WARN_ON(test_bit(BTRFS_DEV_STATE_FLUSH_SENT
, &device
->dev_state
));
1126 WARN_ON(test_bit(BTRFS_DEV_STATE_REPLACE_TGT
, &device
->dev_state
));
1127 WARN_ON(!list_empty(&device
->dev_alloc_list
));
1128 WARN_ON(!list_empty(&device
->post_commit_list
));
1131 static void close_fs_devices(struct btrfs_fs_devices
*fs_devices
)
1133 struct btrfs_device
*device
, *tmp
;
1135 lockdep_assert_held(&uuid_mutex
);
1137 if (--fs_devices
->opened
> 0)
1140 list_for_each_entry_safe(device
, tmp
, &fs_devices
->devices
, dev_list
)
1141 btrfs_close_one_device(device
);
1143 WARN_ON(fs_devices
->open_devices
);
1144 WARN_ON(fs_devices
->rw_devices
);
1145 fs_devices
->opened
= 0;
1146 fs_devices
->seeding
= false;
1147 fs_devices
->fs_info
= NULL
;
1150 void btrfs_close_devices(struct btrfs_fs_devices
*fs_devices
)
1153 struct btrfs_fs_devices
*tmp
;
1155 mutex_lock(&uuid_mutex
);
1156 close_fs_devices(fs_devices
);
1157 if (!fs_devices
->opened
) {
1158 list_splice_init(&fs_devices
->seed_list
, &list
);
1161 * If the struct btrfs_fs_devices is not assembled with any
1162 * other device, it can be re-initialized during the next mount
1163 * without the needing device-scan step. Therefore, it can be
1166 if (fs_devices
->num_devices
== 1) {
1167 list_del(&fs_devices
->fs_list
);
1168 free_fs_devices(fs_devices
);
1173 list_for_each_entry_safe(fs_devices
, tmp
, &list
, seed_list
) {
1174 close_fs_devices(fs_devices
);
1175 list_del(&fs_devices
->seed_list
);
1176 free_fs_devices(fs_devices
);
1178 mutex_unlock(&uuid_mutex
);
1181 static int open_fs_devices(struct btrfs_fs_devices
*fs_devices
,
1182 blk_mode_t flags
, void *holder
)
1184 struct btrfs_device
*device
;
1185 struct btrfs_device
*latest_dev
= NULL
;
1186 struct btrfs_device
*tmp_device
;
1189 list_for_each_entry_safe(device
, tmp_device
, &fs_devices
->devices
,
1193 ret2
= btrfs_open_one_device(fs_devices
, device
, flags
, holder
);
1195 (!latest_dev
|| device
->generation
> latest_dev
->generation
)) {
1196 latest_dev
= device
;
1197 } else if (ret2
== -ENODATA
) {
1198 fs_devices
->num_devices
--;
1199 list_del(&device
->dev_list
);
1200 btrfs_free_device(device
);
1202 if (ret
== 0 && ret2
!= 0)
1206 if (fs_devices
->open_devices
== 0) {
1212 fs_devices
->opened
= 1;
1213 fs_devices
->latest_dev
= latest_dev
;
1214 fs_devices
->total_rw_bytes
= 0;
1215 fs_devices
->chunk_alloc_policy
= BTRFS_CHUNK_ALLOC_REGULAR
;
1216 fs_devices
->read_policy
= BTRFS_READ_POLICY_PID
;
1221 static int devid_cmp(void *priv
, const struct list_head
*a
,
1222 const struct list_head
*b
)
1224 const struct btrfs_device
*dev1
, *dev2
;
1226 dev1
= list_entry(a
, struct btrfs_device
, dev_list
);
1227 dev2
= list_entry(b
, struct btrfs_device
, dev_list
);
1229 if (dev1
->devid
< dev2
->devid
)
1231 else if (dev1
->devid
> dev2
->devid
)
1236 int btrfs_open_devices(struct btrfs_fs_devices
*fs_devices
,
1237 blk_mode_t flags
, void *holder
)
1241 lockdep_assert_held(&uuid_mutex
);
1243 * The device_list_mutex cannot be taken here in case opening the
1244 * underlying device takes further locks like open_mutex.
1246 * We also don't need the lock here as this is called during mount and
1247 * exclusion is provided by uuid_mutex
1250 if (fs_devices
->opened
) {
1251 fs_devices
->opened
++;
1254 list_sort(NULL
, &fs_devices
->devices
, devid_cmp
);
1255 ret
= open_fs_devices(fs_devices
, flags
, holder
);
1261 void btrfs_release_disk_super(struct btrfs_super_block
*super
)
1263 struct page
*page
= virt_to_page(super
);
1268 static struct btrfs_super_block
*btrfs_read_disk_super(struct block_device
*bdev
,
1269 u64 bytenr
, u64 bytenr_orig
)
1271 struct btrfs_super_block
*disk_super
;
1276 /* make sure our super fits in the device */
1277 if (bytenr
+ PAGE_SIZE
>= bdev_nr_bytes(bdev
))
1278 return ERR_PTR(-EINVAL
);
1280 /* make sure our super fits in the page */
1281 if (sizeof(*disk_super
) > PAGE_SIZE
)
1282 return ERR_PTR(-EINVAL
);
1284 /* make sure our super doesn't straddle pages on disk */
1285 index
= bytenr
>> PAGE_SHIFT
;
1286 if ((bytenr
+ sizeof(*disk_super
) - 1) >> PAGE_SHIFT
!= index
)
1287 return ERR_PTR(-EINVAL
);
1289 /* pull in the page with our super */
1290 page
= read_cache_page_gfp(bdev
->bd_inode
->i_mapping
, index
, GFP_KERNEL
);
1293 return ERR_CAST(page
);
1295 p
= page_address(page
);
1297 /* align our pointer to the offset of the super block */
1298 disk_super
= p
+ offset_in_page(bytenr
);
1300 if (btrfs_super_bytenr(disk_super
) != bytenr_orig
||
1301 btrfs_super_magic(disk_super
) != BTRFS_MAGIC
) {
1302 btrfs_release_disk_super(p
);
1303 return ERR_PTR(-EINVAL
);
1306 if (disk_super
->label
[0] && disk_super
->label
[BTRFS_LABEL_SIZE
- 1])
1307 disk_super
->label
[BTRFS_LABEL_SIZE
- 1] = 0;
1312 int btrfs_forget_devices(dev_t devt
)
1316 mutex_lock(&uuid_mutex
);
1317 ret
= btrfs_free_stale_devices(devt
, NULL
);
1318 mutex_unlock(&uuid_mutex
);
1323 static bool btrfs_skip_registration(struct btrfs_super_block
*disk_super
,
1324 const char *path
, dev_t devt
,
1327 struct btrfs_fs_devices
*fs_devices
;
1330 * Do not skip device registration for mounted devices with matching
1331 * maj:min but different paths. Booting without initrd relies on
1332 * /dev/root initially, later replaced with the actual root device.
1333 * A successful scan ensures grub2-probe selects the correct device.
1335 list_for_each_entry(fs_devices
, &fs_uuids
, fs_list
) {
1336 struct btrfs_device
*device
;
1338 mutex_lock(&fs_devices
->device_list_mutex
);
1340 if (!fs_devices
->opened
) {
1341 mutex_unlock(&fs_devices
->device_list_mutex
);
1345 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
) {
1346 if (device
->bdev
&& (device
->bdev
->bd_dev
== devt
) &&
1347 strcmp(device
->name
->str
, path
) != 0) {
1348 mutex_unlock(&fs_devices
->device_list_mutex
);
1350 /* Do not skip registration. */
1354 mutex_unlock(&fs_devices
->device_list_mutex
);
1357 if (!mount_arg_dev
&& btrfs_super_num_devices(disk_super
) == 1 &&
1358 !(btrfs_super_flags(disk_super
) & BTRFS_SUPER_FLAG_SEEDING
))
1365 * Look for a btrfs signature on a device. This may be called out of the mount path
1366 * and we are not allowed to call set_blocksize during the scan. The superblock
1367 * is read via pagecache.
1369 * With @mount_arg_dev it's a scan during mount time that will always register
1370 * the device or return an error. Multi-device and seeding devices are registered
1373 struct btrfs_device
*btrfs_scan_one_device(const char *path
, blk_mode_t flags
,
1376 struct btrfs_super_block
*disk_super
;
1377 bool new_device_added
= false;
1378 struct btrfs_device
*device
= NULL
;
1379 struct file
*bdev_file
;
1380 u64 bytenr
, bytenr_orig
;
1384 lockdep_assert_held(&uuid_mutex
);
1387 * we would like to check all the supers, but that would make
1388 * a btrfs mount succeed after a mkfs from a different FS.
1389 * So, we need to add a special mount option to scan for
1390 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
1394 * Avoid an exclusive open here, as the systemd-udev may initiate the
1395 * device scan which may race with the user's mount or mkfs command,
1396 * resulting in failure.
1397 * Since the device scan is solely for reading purposes, there is no
1398 * need for an exclusive open. Additionally, the devices are read again
1399 * during the mount process. It is ok to get some inconsistent
1400 * values temporarily, as the device paths of the fsid are the only
1401 * required information for assembling the volume.
1403 bdev_file
= bdev_file_open_by_path(path
, flags
, NULL
, NULL
);
1404 if (IS_ERR(bdev_file
))
1405 return ERR_CAST(bdev_file
);
1407 bytenr_orig
= btrfs_sb_offset(0);
1408 ret
= btrfs_sb_log_location_bdev(file_bdev(bdev_file
), 0, READ
, &bytenr
);
1410 device
= ERR_PTR(ret
);
1411 goto error_bdev_put
;
1414 disk_super
= btrfs_read_disk_super(file_bdev(bdev_file
), bytenr
,
1416 if (IS_ERR(disk_super
)) {
1417 device
= ERR_CAST(disk_super
);
1418 goto error_bdev_put
;
1421 devt
= file_bdev(bdev_file
)->bd_dev
;
1422 if (btrfs_skip_registration(disk_super
, path
, devt
, mount_arg_dev
)) {
1423 pr_debug("BTRFS: skip registering single non-seed device %s (%d:%d)\n",
1424 path
, MAJOR(devt
), MINOR(devt
));
1426 btrfs_free_stale_devices(devt
, NULL
);
1429 goto free_disk_super
;
1432 device
= device_list_add(path
, disk_super
, &new_device_added
);
1433 if (!IS_ERR(device
) && new_device_added
)
1434 btrfs_free_stale_devices(device
->devt
, device
);
1437 btrfs_release_disk_super(disk_super
);
1446 * Try to find a chunk that intersects [start, start + len] range and when one
1447 * such is found, record the end of it in *start
1449 static bool contains_pending_extent(struct btrfs_device
*device
, u64
*start
,
1452 u64 physical_start
, physical_end
;
1454 lockdep_assert_held(&device
->fs_info
->chunk_mutex
);
1456 if (find_first_extent_bit(&device
->alloc_state
, *start
,
1457 &physical_start
, &physical_end
,
1458 CHUNK_ALLOCATED
, NULL
)) {
1460 if (in_range(physical_start
, *start
, len
) ||
1461 in_range(*start
, physical_start
,
1462 physical_end
+ 1 - physical_start
)) {
1463 *start
= physical_end
+ 1;
1470 static u64
dev_extent_search_start(struct btrfs_device
*device
)
1472 switch (device
->fs_devices
->chunk_alloc_policy
) {
1473 case BTRFS_CHUNK_ALLOC_REGULAR
:
1474 return BTRFS_DEVICE_RANGE_RESERVED
;
1475 case BTRFS_CHUNK_ALLOC_ZONED
:
1477 * We don't care about the starting region like regular
1478 * allocator, because we anyway use/reserve the first two zones
1479 * for superblock logging.
1487 static bool dev_extent_hole_check_zoned(struct btrfs_device
*device
,
1488 u64
*hole_start
, u64
*hole_size
,
1491 u64 zone_size
= device
->zone_info
->zone_size
;
1494 bool changed
= false;
1496 ASSERT(IS_ALIGNED(*hole_start
, zone_size
));
1498 while (*hole_size
> 0) {
1499 pos
= btrfs_find_allocatable_zones(device
, *hole_start
,
1500 *hole_start
+ *hole_size
,
1502 if (pos
!= *hole_start
) {
1503 *hole_size
= *hole_start
+ *hole_size
- pos
;
1506 if (*hole_size
< num_bytes
)
1510 ret
= btrfs_ensure_empty_zones(device
, pos
, num_bytes
);
1512 /* Range is ensured to be empty */
1516 /* Given hole range was invalid (outside of device) */
1517 if (ret
== -ERANGE
) {
1518 *hole_start
+= *hole_size
;
1523 *hole_start
+= zone_size
;
1524 *hole_size
-= zone_size
;
1532 * Check if specified hole is suitable for allocation.
1534 * @device: the device which we have the hole
1535 * @hole_start: starting position of the hole
1536 * @hole_size: the size of the hole
1537 * @num_bytes: the size of the free space that we need
1539 * This function may modify @hole_start and @hole_size to reflect the suitable
1540 * position for allocation. Returns 1 if hole position is updated, 0 otherwise.
1542 static bool dev_extent_hole_check(struct btrfs_device
*device
, u64
*hole_start
,
1543 u64
*hole_size
, u64 num_bytes
)
1545 bool changed
= false;
1546 u64 hole_end
= *hole_start
+ *hole_size
;
1550 * Check before we set max_hole_start, otherwise we could end up
1551 * sending back this offset anyway.
1553 if (contains_pending_extent(device
, hole_start
, *hole_size
)) {
1554 if (hole_end
>= *hole_start
)
1555 *hole_size
= hole_end
- *hole_start
;
1561 switch (device
->fs_devices
->chunk_alloc_policy
) {
1562 case BTRFS_CHUNK_ALLOC_REGULAR
:
1563 /* No extra check */
1565 case BTRFS_CHUNK_ALLOC_ZONED
:
1566 if (dev_extent_hole_check_zoned(device
, hole_start
,
1567 hole_size
, num_bytes
)) {
1570 * The changed hole can contain pending extent.
1571 * Loop again to check that.
1587 * Find free space in the specified device.
1589 * @device: the device which we search the free space in
1590 * @num_bytes: the size of the free space that we need
1591 * @search_start: the position from which to begin the search
1592 * @start: store the start of the free space.
1593 * @len: the size of the free space. that we find, or the size
1594 * of the max free space if we don't find suitable free space
1596 * This does a pretty simple search, the expectation is that it is called very
1597 * infrequently and that a given device has a small number of extents.
1599 * @start is used to store the start of the free space if we find. But if we
1600 * don't find suitable free space, it will be used to store the start position
1601 * of the max free space.
1603 * @len is used to store the size of the free space that we find.
1604 * But if we don't find suitable free space, it is used to store the size of
1605 * the max free space.
1607 * NOTE: This function will search *commit* root of device tree, and does extra
1608 * check to ensure dev extents are not double allocated.
1609 * This makes the function safe to allocate dev extents but may not report
1610 * correct usable device space, as device extent freed in current transaction
1611 * is not reported as available.
1613 static int find_free_dev_extent(struct btrfs_device
*device
, u64 num_bytes
,
1614 u64
*start
, u64
*len
)
1616 struct btrfs_fs_info
*fs_info
= device
->fs_info
;
1617 struct btrfs_root
*root
= fs_info
->dev_root
;
1618 struct btrfs_key key
;
1619 struct btrfs_dev_extent
*dev_extent
;
1620 struct btrfs_path
*path
;
1624 u64 max_hole_size
= 0;
1626 u64 search_end
= device
->total_bytes
;
1629 struct extent_buffer
*l
;
1631 search_start
= dev_extent_search_start(device
);
1632 max_hole_start
= search_start
;
1634 WARN_ON(device
->zone_info
&&
1635 !IS_ALIGNED(num_bytes
, device
->zone_info
->zone_size
));
1637 path
= btrfs_alloc_path();
1643 if (search_start
>= search_end
||
1644 test_bit(BTRFS_DEV_STATE_REPLACE_TGT
, &device
->dev_state
)) {
1649 path
->reada
= READA_FORWARD
;
1650 path
->search_commit_root
= 1;
1651 path
->skip_locking
= 1;
1653 key
.objectid
= device
->devid
;
1654 key
.offset
= search_start
;
1655 key
.type
= BTRFS_DEV_EXTENT_KEY
;
1657 ret
= btrfs_search_backwards(root
, &key
, path
);
1661 while (search_start
< search_end
) {
1663 slot
= path
->slots
[0];
1664 if (slot
>= btrfs_header_nritems(l
)) {
1665 ret
= btrfs_next_leaf(root
, path
);
1673 btrfs_item_key_to_cpu(l
, &key
, slot
);
1675 if (key
.objectid
< device
->devid
)
1678 if (key
.objectid
> device
->devid
)
1681 if (key
.type
!= BTRFS_DEV_EXTENT_KEY
)
1684 if (key
.offset
> search_end
)
1687 if (key
.offset
> search_start
) {
1688 hole_size
= key
.offset
- search_start
;
1689 dev_extent_hole_check(device
, &search_start
, &hole_size
,
1692 if (hole_size
> max_hole_size
) {
1693 max_hole_start
= search_start
;
1694 max_hole_size
= hole_size
;
1698 * If this free space is greater than which we need,
1699 * it must be the max free space that we have found
1700 * until now, so max_hole_start must point to the start
1701 * of this free space and the length of this free space
1702 * is stored in max_hole_size. Thus, we return
1703 * max_hole_start and max_hole_size and go back to the
1706 if (hole_size
>= num_bytes
) {
1712 dev_extent
= btrfs_item_ptr(l
, slot
, struct btrfs_dev_extent
);
1713 extent_end
= key
.offset
+ btrfs_dev_extent_length(l
,
1715 if (extent_end
> search_start
)
1716 search_start
= extent_end
;
1723 * At this point, search_start should be the end of
1724 * allocated dev extents, and when shrinking the device,
1725 * search_end may be smaller than search_start.
1727 if (search_end
> search_start
) {
1728 hole_size
= search_end
- search_start
;
1729 if (dev_extent_hole_check(device
, &search_start
, &hole_size
,
1731 btrfs_release_path(path
);
1735 if (hole_size
> max_hole_size
) {
1736 max_hole_start
= search_start
;
1737 max_hole_size
= hole_size
;
1742 if (max_hole_size
< num_bytes
)
1747 ASSERT(max_hole_start
+ max_hole_size
<= search_end
);
1749 btrfs_free_path(path
);
1750 *start
= max_hole_start
;
1752 *len
= max_hole_size
;
1756 static int btrfs_free_dev_extent(struct btrfs_trans_handle
*trans
,
1757 struct btrfs_device
*device
,
1758 u64 start
, u64
*dev_extent_len
)
1760 struct btrfs_fs_info
*fs_info
= device
->fs_info
;
1761 struct btrfs_root
*root
= fs_info
->dev_root
;
1763 struct btrfs_path
*path
;
1764 struct btrfs_key key
;
1765 struct btrfs_key found_key
;
1766 struct extent_buffer
*leaf
= NULL
;
1767 struct btrfs_dev_extent
*extent
= NULL
;
1769 path
= btrfs_alloc_path();
1773 key
.objectid
= device
->devid
;
1775 key
.type
= BTRFS_DEV_EXTENT_KEY
;
1777 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1779 ret
= btrfs_previous_item(root
, path
, key
.objectid
,
1780 BTRFS_DEV_EXTENT_KEY
);
1783 leaf
= path
->nodes
[0];
1784 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1785 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
1786 struct btrfs_dev_extent
);
1787 BUG_ON(found_key
.offset
> start
|| found_key
.offset
+
1788 btrfs_dev_extent_length(leaf
, extent
) < start
);
1790 btrfs_release_path(path
);
1792 } else if (ret
== 0) {
1793 leaf
= path
->nodes
[0];
1794 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
1795 struct btrfs_dev_extent
);
1800 *dev_extent_len
= btrfs_dev_extent_length(leaf
, extent
);
1802 ret
= btrfs_del_item(trans
, root
, path
);
1804 set_bit(BTRFS_TRANS_HAVE_FREE_BGS
, &trans
->transaction
->flags
);
1806 btrfs_free_path(path
);
1810 static u64
find_next_chunk(struct btrfs_fs_info
*fs_info
)
1815 read_lock(&fs_info
->mapping_tree_lock
);
1816 n
= rb_last(&fs_info
->mapping_tree
.rb_root
);
1818 struct btrfs_chunk_map
*map
;
1820 map
= rb_entry(n
, struct btrfs_chunk_map
, rb_node
);
1821 ret
= map
->start
+ map
->chunk_len
;
1823 read_unlock(&fs_info
->mapping_tree_lock
);
1828 static noinline
int find_next_devid(struct btrfs_fs_info
*fs_info
,
1832 struct btrfs_key key
;
1833 struct btrfs_key found_key
;
1834 struct btrfs_path
*path
;
1836 path
= btrfs_alloc_path();
1840 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
1841 key
.type
= BTRFS_DEV_ITEM_KEY
;
1842 key
.offset
= (u64
)-1;
1844 ret
= btrfs_search_slot(NULL
, fs_info
->chunk_root
, &key
, path
, 0, 0);
1850 btrfs_err(fs_info
, "corrupted chunk tree devid -1 matched");
1855 ret
= btrfs_previous_item(fs_info
->chunk_root
, path
,
1856 BTRFS_DEV_ITEMS_OBJECTID
,
1857 BTRFS_DEV_ITEM_KEY
);
1861 btrfs_item_key_to_cpu(path
->nodes
[0], &found_key
,
1863 *devid_ret
= found_key
.offset
+ 1;
1867 btrfs_free_path(path
);
1872 * the device information is stored in the chunk root
1873 * the btrfs_device struct should be fully filled in
1875 static int btrfs_add_dev_item(struct btrfs_trans_handle
*trans
,
1876 struct btrfs_device
*device
)
1879 struct btrfs_path
*path
;
1880 struct btrfs_dev_item
*dev_item
;
1881 struct extent_buffer
*leaf
;
1882 struct btrfs_key key
;
1885 path
= btrfs_alloc_path();
1889 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
1890 key
.type
= BTRFS_DEV_ITEM_KEY
;
1891 key
.offset
= device
->devid
;
1893 btrfs_reserve_chunk_metadata(trans
, true);
1894 ret
= btrfs_insert_empty_item(trans
, trans
->fs_info
->chunk_root
, path
,
1895 &key
, sizeof(*dev_item
));
1896 btrfs_trans_release_chunk_metadata(trans
);
1900 leaf
= path
->nodes
[0];
1901 dev_item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_dev_item
);
1903 btrfs_set_device_id(leaf
, dev_item
, device
->devid
);
1904 btrfs_set_device_generation(leaf
, dev_item
, 0);
1905 btrfs_set_device_type(leaf
, dev_item
, device
->type
);
1906 btrfs_set_device_io_align(leaf
, dev_item
, device
->io_align
);
1907 btrfs_set_device_io_width(leaf
, dev_item
, device
->io_width
);
1908 btrfs_set_device_sector_size(leaf
, dev_item
, device
->sector_size
);
1909 btrfs_set_device_total_bytes(leaf
, dev_item
,
1910 btrfs_device_get_disk_total_bytes(device
));
1911 btrfs_set_device_bytes_used(leaf
, dev_item
,
1912 btrfs_device_get_bytes_used(device
));
1913 btrfs_set_device_group(leaf
, dev_item
, 0);
1914 btrfs_set_device_seek_speed(leaf
, dev_item
, 0);
1915 btrfs_set_device_bandwidth(leaf
, dev_item
, 0);
1916 btrfs_set_device_start_offset(leaf
, dev_item
, 0);
1918 ptr
= btrfs_device_uuid(dev_item
);
1919 write_extent_buffer(leaf
, device
->uuid
, ptr
, BTRFS_UUID_SIZE
);
1920 ptr
= btrfs_device_fsid(dev_item
);
1921 write_extent_buffer(leaf
, trans
->fs_info
->fs_devices
->metadata_uuid
,
1922 ptr
, BTRFS_FSID_SIZE
);
1923 btrfs_mark_buffer_dirty(trans
, leaf
);
1927 btrfs_free_path(path
);
1932 * Function to update ctime/mtime for a given device path.
1933 * Mainly used for ctime/mtime based probe like libblkid.
1935 * We don't care about errors here, this is just to be kind to userspace.
1937 static void update_dev_time(const char *device_path
)
1942 ret
= kern_path(device_path
, LOOKUP_FOLLOW
, &path
);
1946 inode_update_time(d_inode(path
.dentry
), S_MTIME
| S_CTIME
| S_VERSION
);
1950 static int btrfs_rm_dev_item(struct btrfs_trans_handle
*trans
,
1951 struct btrfs_device
*device
)
1953 struct btrfs_root
*root
= device
->fs_info
->chunk_root
;
1955 struct btrfs_path
*path
;
1956 struct btrfs_key key
;
1958 path
= btrfs_alloc_path();
1962 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
1963 key
.type
= BTRFS_DEV_ITEM_KEY
;
1964 key
.offset
= device
->devid
;
1966 btrfs_reserve_chunk_metadata(trans
, false);
1967 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1968 btrfs_trans_release_chunk_metadata(trans
);
1975 ret
= btrfs_del_item(trans
, root
, path
);
1977 btrfs_free_path(path
);
1982 * Verify that @num_devices satisfies the RAID profile constraints in the whole
1983 * filesystem. It's up to the caller to adjust that number regarding eg. device
1986 static int btrfs_check_raid_min_devices(struct btrfs_fs_info
*fs_info
,
1994 seq
= read_seqbegin(&fs_info
->profiles_lock
);
1996 all_avail
= fs_info
->avail_data_alloc_bits
|
1997 fs_info
->avail_system_alloc_bits
|
1998 fs_info
->avail_metadata_alloc_bits
;
1999 } while (read_seqretry(&fs_info
->profiles_lock
, seq
));
2001 for (i
= 0; i
< BTRFS_NR_RAID_TYPES
; i
++) {
2002 if (!(all_avail
& btrfs_raid_array
[i
].bg_flag
))
2005 if (num_devices
< btrfs_raid_array
[i
].devs_min
)
2006 return btrfs_raid_array
[i
].mindev_error
;
2012 static struct btrfs_device
* btrfs_find_next_active_device(
2013 struct btrfs_fs_devices
*fs_devs
, struct btrfs_device
*device
)
2015 struct btrfs_device
*next_device
;
2017 list_for_each_entry(next_device
, &fs_devs
->devices
, dev_list
) {
2018 if (next_device
!= device
&&
2019 !test_bit(BTRFS_DEV_STATE_MISSING
, &next_device
->dev_state
)
2020 && next_device
->bdev
)
2028 * Helper function to check if the given device is part of s_bdev / latest_dev
2029 * and replace it with the provided or the next active device, in the context
2030 * where this function called, there should be always be another device (or
2031 * this_dev) which is active.
2033 void __cold
btrfs_assign_next_active_device(struct btrfs_device
*device
,
2034 struct btrfs_device
*next_device
)
2036 struct btrfs_fs_info
*fs_info
= device
->fs_info
;
2039 next_device
= btrfs_find_next_active_device(fs_info
->fs_devices
,
2041 ASSERT(next_device
);
2043 if (fs_info
->sb
->s_bdev
&&
2044 (fs_info
->sb
->s_bdev
== device
->bdev
))
2045 fs_info
->sb
->s_bdev
= next_device
->bdev
;
2047 if (fs_info
->fs_devices
->latest_dev
->bdev
== device
->bdev
)
2048 fs_info
->fs_devices
->latest_dev
= next_device
;
2052 * Return btrfs_fs_devices::num_devices excluding the device that's being
2053 * currently replaced.
2055 static u64
btrfs_num_devices(struct btrfs_fs_info
*fs_info
)
2057 u64 num_devices
= fs_info
->fs_devices
->num_devices
;
2059 down_read(&fs_info
->dev_replace
.rwsem
);
2060 if (btrfs_dev_replace_is_ongoing(&fs_info
->dev_replace
)) {
2061 ASSERT(num_devices
> 1);
2064 up_read(&fs_info
->dev_replace
.rwsem
);
2069 static void btrfs_scratch_superblock(struct btrfs_fs_info
*fs_info
,
2070 struct block_device
*bdev
, int copy_num
)
2072 struct btrfs_super_block
*disk_super
;
2073 const size_t len
= sizeof(disk_super
->magic
);
2074 const u64 bytenr
= btrfs_sb_offset(copy_num
);
2077 disk_super
= btrfs_read_disk_super(bdev
, bytenr
, bytenr
);
2078 if (IS_ERR(disk_super
))
2081 memset(&disk_super
->magic
, 0, len
);
2082 folio_mark_dirty(virt_to_folio(disk_super
));
2083 btrfs_release_disk_super(disk_super
);
2085 ret
= sync_blockdev_range(bdev
, bytenr
, bytenr
+ len
- 1);
2087 btrfs_warn(fs_info
, "error clearing superblock number %d (%d)",
2091 void btrfs_scratch_superblocks(struct btrfs_fs_info
*fs_info
, struct btrfs_device
*device
)
2094 struct block_device
*bdev
= device
->bdev
;
2099 for (copy_num
= 0; copy_num
< BTRFS_SUPER_MIRROR_MAX
; copy_num
++) {
2100 if (bdev_is_zoned(bdev
))
2101 btrfs_reset_sb_log_zones(bdev
, copy_num
);
2103 btrfs_scratch_superblock(fs_info
, bdev
, copy_num
);
2106 /* Notify udev that device has changed */
2107 btrfs_kobject_uevent(bdev
, KOBJ_CHANGE
);
2109 /* Update ctime/mtime for device path for libblkid */
2110 update_dev_time(device
->name
->str
);
2113 int btrfs_rm_device(struct btrfs_fs_info
*fs_info
,
2114 struct btrfs_dev_lookup_args
*args
,
2115 struct file
**bdev_file
)
2117 struct btrfs_trans_handle
*trans
;
2118 struct btrfs_device
*device
;
2119 struct btrfs_fs_devices
*cur_devices
;
2120 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
2124 if (btrfs_fs_incompat(fs_info
, EXTENT_TREE_V2
)) {
2125 btrfs_err(fs_info
, "device remove not supported on extent tree v2 yet");
2130 * The device list in fs_devices is accessed without locks (neither
2131 * uuid_mutex nor device_list_mutex) as it won't change on a mounted
2132 * filesystem and another device rm cannot run.
2134 num_devices
= btrfs_num_devices(fs_info
);
2136 ret
= btrfs_check_raid_min_devices(fs_info
, num_devices
- 1);
2140 device
= btrfs_find_device(fs_info
->fs_devices
, args
);
2143 ret
= BTRFS_ERROR_DEV_MISSING_NOT_FOUND
;
2149 if (btrfs_pinned_by_swapfile(fs_info
, device
)) {
2150 btrfs_warn_in_rcu(fs_info
,
2151 "cannot remove device %s (devid %llu) due to active swapfile",
2152 btrfs_dev_name(device
), device
->devid
);
2156 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT
, &device
->dev_state
))
2157 return BTRFS_ERROR_DEV_TGT_REPLACE
;
2159 if (test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
) &&
2160 fs_info
->fs_devices
->rw_devices
== 1)
2161 return BTRFS_ERROR_DEV_ONLY_WRITABLE
;
2163 if (test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
)) {
2164 mutex_lock(&fs_info
->chunk_mutex
);
2165 list_del_init(&device
->dev_alloc_list
);
2166 device
->fs_devices
->rw_devices
--;
2167 mutex_unlock(&fs_info
->chunk_mutex
);
2170 ret
= btrfs_shrink_device(device
, 0);
2174 trans
= btrfs_start_transaction(fs_info
->chunk_root
, 0);
2175 if (IS_ERR(trans
)) {
2176 ret
= PTR_ERR(trans
);
2180 ret
= btrfs_rm_dev_item(trans
, device
);
2182 /* Any error in dev item removal is critical */
2184 "failed to remove device item for devid %llu: %d",
2185 device
->devid
, ret
);
2186 btrfs_abort_transaction(trans
, ret
);
2187 btrfs_end_transaction(trans
);
2191 clear_bit(BTRFS_DEV_STATE_IN_FS_METADATA
, &device
->dev_state
);
2192 btrfs_scrub_cancel_dev(device
);
2195 * the device list mutex makes sure that we don't change
2196 * the device list while someone else is writing out all
2197 * the device supers. Whoever is writing all supers, should
2198 * lock the device list mutex before getting the number of
2199 * devices in the super block (super_copy). Conversely,
2200 * whoever updates the number of devices in the super block
2201 * (super_copy) should hold the device list mutex.
2205 * In normal cases the cur_devices == fs_devices. But in case
2206 * of deleting a seed device, the cur_devices should point to
2207 * its own fs_devices listed under the fs_devices->seed_list.
2209 cur_devices
= device
->fs_devices
;
2210 mutex_lock(&fs_devices
->device_list_mutex
);
2211 list_del_rcu(&device
->dev_list
);
2213 cur_devices
->num_devices
--;
2214 cur_devices
->total_devices
--;
2215 /* Update total_devices of the parent fs_devices if it's seed */
2216 if (cur_devices
!= fs_devices
)
2217 fs_devices
->total_devices
--;
2219 if (test_bit(BTRFS_DEV_STATE_MISSING
, &device
->dev_state
))
2220 cur_devices
->missing_devices
--;
2222 btrfs_assign_next_active_device(device
, NULL
);
2224 if (device
->bdev_file
) {
2225 cur_devices
->open_devices
--;
2226 /* remove sysfs entry */
2227 btrfs_sysfs_remove_device(device
);
2230 num_devices
= btrfs_super_num_devices(fs_info
->super_copy
) - 1;
2231 btrfs_set_super_num_devices(fs_info
->super_copy
, num_devices
);
2232 mutex_unlock(&fs_devices
->device_list_mutex
);
2235 * At this point, the device is zero sized and detached from the
2236 * devices list. All that's left is to zero out the old supers and
2239 * We cannot call btrfs_close_bdev() here because we're holding the sb
2240 * write lock, and fput() on the block device will pull in the
2241 * ->open_mutex on the block device and it's dependencies. Instead
2242 * just flush the device and let the caller do the final bdev_release.
2244 if (test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
)) {
2245 btrfs_scratch_superblocks(fs_info
, device
);
2247 sync_blockdev(device
->bdev
);
2248 invalidate_bdev(device
->bdev
);
2252 *bdev_file
= device
->bdev_file
;
2254 btrfs_free_device(device
);
2257 * This can happen if cur_devices is the private seed devices list. We
2258 * cannot call close_fs_devices() here because it expects the uuid_mutex
2259 * to be held, but in fact we don't need that for the private
2260 * seed_devices, we can simply decrement cur_devices->opened and then
2261 * remove it from our list and free the fs_devices.
2263 if (cur_devices
->num_devices
== 0) {
2264 list_del_init(&cur_devices
->seed_list
);
2265 ASSERT(cur_devices
->opened
== 1);
2266 cur_devices
->opened
--;
2267 free_fs_devices(cur_devices
);
2270 ret
= btrfs_commit_transaction(trans
);
2275 if (test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
)) {
2276 mutex_lock(&fs_info
->chunk_mutex
);
2277 list_add(&device
->dev_alloc_list
,
2278 &fs_devices
->alloc_list
);
2279 device
->fs_devices
->rw_devices
++;
2280 mutex_unlock(&fs_info
->chunk_mutex
);
2285 void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device
*srcdev
)
2287 struct btrfs_fs_devices
*fs_devices
;
2289 lockdep_assert_held(&srcdev
->fs_info
->fs_devices
->device_list_mutex
);
2292 * in case of fs with no seed, srcdev->fs_devices will point
2293 * to fs_devices of fs_info. However when the dev being replaced is
2294 * a seed dev it will point to the seed's local fs_devices. In short
2295 * srcdev will have its correct fs_devices in both the cases.
2297 fs_devices
= srcdev
->fs_devices
;
2299 list_del_rcu(&srcdev
->dev_list
);
2300 list_del(&srcdev
->dev_alloc_list
);
2301 fs_devices
->num_devices
--;
2302 if (test_bit(BTRFS_DEV_STATE_MISSING
, &srcdev
->dev_state
))
2303 fs_devices
->missing_devices
--;
2305 if (test_bit(BTRFS_DEV_STATE_WRITEABLE
, &srcdev
->dev_state
))
2306 fs_devices
->rw_devices
--;
2309 fs_devices
->open_devices
--;
2312 void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device
*srcdev
)
2314 struct btrfs_fs_devices
*fs_devices
= srcdev
->fs_devices
;
2316 mutex_lock(&uuid_mutex
);
2318 btrfs_close_bdev(srcdev
);
2320 btrfs_free_device(srcdev
);
2322 /* if this is no devs we rather delete the fs_devices */
2323 if (!fs_devices
->num_devices
) {
2325 * On a mounted FS, num_devices can't be zero unless it's a
2326 * seed. In case of a seed device being replaced, the replace
2327 * target added to the sprout FS, so there will be no more
2328 * device left under the seed FS.
2330 ASSERT(fs_devices
->seeding
);
2332 list_del_init(&fs_devices
->seed_list
);
2333 close_fs_devices(fs_devices
);
2334 free_fs_devices(fs_devices
);
2336 mutex_unlock(&uuid_mutex
);
2339 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device
*tgtdev
)
2341 struct btrfs_fs_devices
*fs_devices
= tgtdev
->fs_info
->fs_devices
;
2343 mutex_lock(&fs_devices
->device_list_mutex
);
2345 btrfs_sysfs_remove_device(tgtdev
);
2348 fs_devices
->open_devices
--;
2350 fs_devices
->num_devices
--;
2352 btrfs_assign_next_active_device(tgtdev
, NULL
);
2354 list_del_rcu(&tgtdev
->dev_list
);
2356 mutex_unlock(&fs_devices
->device_list_mutex
);
2358 btrfs_scratch_superblocks(tgtdev
->fs_info
, tgtdev
);
2360 btrfs_close_bdev(tgtdev
);
2362 btrfs_free_device(tgtdev
);
2366 * Populate args from device at path.
2368 * @fs_info: the filesystem
2369 * @args: the args to populate
2370 * @path: the path to the device
2372 * This will read the super block of the device at @path and populate @args with
2373 * the devid, fsid, and uuid. This is meant to be used for ioctls that need to
2374 * lookup a device to operate on, but need to do it before we take any locks.
2375 * This properly handles the special case of "missing" that a user may pass in,
2376 * and does some basic sanity checks. The caller must make sure that @path is
2377 * properly NUL terminated before calling in, and must call
2378 * btrfs_put_dev_args_from_path() in order to free up the temporary fsid and
2381 * Return: 0 for success, -errno for failure
2383 int btrfs_get_dev_args_from_path(struct btrfs_fs_info
*fs_info
,
2384 struct btrfs_dev_lookup_args
*args
,
2387 struct btrfs_super_block
*disk_super
;
2388 struct file
*bdev_file
;
2391 if (!path
|| !path
[0])
2393 if (!strcmp(path
, "missing")) {
2394 args
->missing
= true;
2398 args
->uuid
= kzalloc(BTRFS_UUID_SIZE
, GFP_KERNEL
);
2399 args
->fsid
= kzalloc(BTRFS_FSID_SIZE
, GFP_KERNEL
);
2400 if (!args
->uuid
|| !args
->fsid
) {
2401 btrfs_put_dev_args_from_path(args
);
2405 ret
= btrfs_get_bdev_and_sb(path
, BLK_OPEN_READ
, NULL
, 0,
2406 &bdev_file
, &disk_super
);
2408 btrfs_put_dev_args_from_path(args
);
2412 args
->devid
= btrfs_stack_device_id(&disk_super
->dev_item
);
2413 memcpy(args
->uuid
, disk_super
->dev_item
.uuid
, BTRFS_UUID_SIZE
);
2414 if (btrfs_fs_incompat(fs_info
, METADATA_UUID
))
2415 memcpy(args
->fsid
, disk_super
->metadata_uuid
, BTRFS_FSID_SIZE
);
2417 memcpy(args
->fsid
, disk_super
->fsid
, BTRFS_FSID_SIZE
);
2418 btrfs_release_disk_super(disk_super
);
2424 * Only use this jointly with btrfs_get_dev_args_from_path() because we will
2425 * allocate our ->uuid and ->fsid pointers, everybody else uses local variables
2426 * that don't need to be freed.
2428 void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args
*args
)
2436 struct btrfs_device
*btrfs_find_device_by_devspec(
2437 struct btrfs_fs_info
*fs_info
, u64 devid
,
2438 const char *device_path
)
2440 BTRFS_DEV_LOOKUP_ARGS(args
);
2441 struct btrfs_device
*device
;
2446 device
= btrfs_find_device(fs_info
->fs_devices
, &args
);
2448 return ERR_PTR(-ENOENT
);
2452 ret
= btrfs_get_dev_args_from_path(fs_info
, &args
, device_path
);
2454 return ERR_PTR(ret
);
2455 device
= btrfs_find_device(fs_info
->fs_devices
, &args
);
2456 btrfs_put_dev_args_from_path(&args
);
2458 return ERR_PTR(-ENOENT
);
2462 static struct btrfs_fs_devices
*btrfs_init_sprout(struct btrfs_fs_info
*fs_info
)
2464 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
2465 struct btrfs_fs_devices
*old_devices
;
2466 struct btrfs_fs_devices
*seed_devices
;
2468 lockdep_assert_held(&uuid_mutex
);
2469 if (!fs_devices
->seeding
)
2470 return ERR_PTR(-EINVAL
);
2473 * Private copy of the seed devices, anchored at
2474 * fs_info->fs_devices->seed_list
2476 seed_devices
= alloc_fs_devices(NULL
);
2477 if (IS_ERR(seed_devices
))
2478 return seed_devices
;
2481 * It's necessary to retain a copy of the original seed fs_devices in
2482 * fs_uuids so that filesystems which have been seeded can successfully
2483 * reference the seed device from open_seed_devices. This also supports
2486 old_devices
= clone_fs_devices(fs_devices
);
2487 if (IS_ERR(old_devices
)) {
2488 kfree(seed_devices
);
2492 list_add(&old_devices
->fs_list
, &fs_uuids
);
2494 memcpy(seed_devices
, fs_devices
, sizeof(*seed_devices
));
2495 seed_devices
->opened
= 1;
2496 INIT_LIST_HEAD(&seed_devices
->devices
);
2497 INIT_LIST_HEAD(&seed_devices
->alloc_list
);
2498 mutex_init(&seed_devices
->device_list_mutex
);
2500 return seed_devices
;
2504 * Splice seed devices into the sprout fs_devices.
2505 * Generate a new fsid for the sprouted read-write filesystem.
2507 static void btrfs_setup_sprout(struct btrfs_fs_info
*fs_info
,
2508 struct btrfs_fs_devices
*seed_devices
)
2510 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
2511 struct btrfs_super_block
*disk_super
= fs_info
->super_copy
;
2512 struct btrfs_device
*device
;
2516 * We are updating the fsid, the thread leading to device_list_add()
2517 * could race, so uuid_mutex is needed.
2519 lockdep_assert_held(&uuid_mutex
);
2522 * The threads listed below may traverse dev_list but can do that without
2523 * device_list_mutex:
2524 * - All device ops and balance - as we are in btrfs_exclop_start.
2525 * - Various dev_list readers - are using RCU.
2526 * - btrfs_ioctl_fitrim() - is using RCU.
2528 * For-read threads as below are using device_list_mutex:
2529 * - Readonly scrub btrfs_scrub_dev()
2530 * - Readonly scrub btrfs_scrub_progress()
2531 * - btrfs_get_dev_stats()
2533 lockdep_assert_held(&fs_devices
->device_list_mutex
);
2535 list_splice_init_rcu(&fs_devices
->devices
, &seed_devices
->devices
,
2537 list_for_each_entry(device
, &seed_devices
->devices
, dev_list
)
2538 device
->fs_devices
= seed_devices
;
2540 fs_devices
->seeding
= false;
2541 fs_devices
->num_devices
= 0;
2542 fs_devices
->open_devices
= 0;
2543 fs_devices
->missing_devices
= 0;
2544 fs_devices
->rotating
= false;
2545 list_add(&seed_devices
->seed_list
, &fs_devices
->seed_list
);
2547 generate_random_uuid(fs_devices
->fsid
);
2548 memcpy(fs_devices
->metadata_uuid
, fs_devices
->fsid
, BTRFS_FSID_SIZE
);
2549 memcpy(disk_super
->fsid
, fs_devices
->fsid
, BTRFS_FSID_SIZE
);
2551 super_flags
= btrfs_super_flags(disk_super
) &
2552 ~BTRFS_SUPER_FLAG_SEEDING
;
2553 btrfs_set_super_flags(disk_super
, super_flags
);
2557 * Store the expected generation for seed devices in device items.
2559 static int btrfs_finish_sprout(struct btrfs_trans_handle
*trans
)
2561 BTRFS_DEV_LOOKUP_ARGS(args
);
2562 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
2563 struct btrfs_root
*root
= fs_info
->chunk_root
;
2564 struct btrfs_path
*path
;
2565 struct extent_buffer
*leaf
;
2566 struct btrfs_dev_item
*dev_item
;
2567 struct btrfs_device
*device
;
2568 struct btrfs_key key
;
2569 u8 fs_uuid
[BTRFS_FSID_SIZE
];
2570 u8 dev_uuid
[BTRFS_UUID_SIZE
];
2573 path
= btrfs_alloc_path();
2577 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
2579 key
.type
= BTRFS_DEV_ITEM_KEY
;
2582 btrfs_reserve_chunk_metadata(trans
, false);
2583 ret
= btrfs_search_slot(trans
, root
, &key
, path
, 0, 1);
2584 btrfs_trans_release_chunk_metadata(trans
);
2588 leaf
= path
->nodes
[0];
2590 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
2591 ret
= btrfs_next_leaf(root
, path
);
2596 leaf
= path
->nodes
[0];
2597 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2598 btrfs_release_path(path
);
2602 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2603 if (key
.objectid
!= BTRFS_DEV_ITEMS_OBJECTID
||
2604 key
.type
!= BTRFS_DEV_ITEM_KEY
)
2607 dev_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
2608 struct btrfs_dev_item
);
2609 args
.devid
= btrfs_device_id(leaf
, dev_item
);
2610 read_extent_buffer(leaf
, dev_uuid
, btrfs_device_uuid(dev_item
),
2612 read_extent_buffer(leaf
, fs_uuid
, btrfs_device_fsid(dev_item
),
2614 args
.uuid
= dev_uuid
;
2615 args
.fsid
= fs_uuid
;
2616 device
= btrfs_find_device(fs_info
->fs_devices
, &args
);
2617 BUG_ON(!device
); /* Logic error */
2619 if (device
->fs_devices
->seeding
) {
2620 btrfs_set_device_generation(leaf
, dev_item
,
2621 device
->generation
);
2622 btrfs_mark_buffer_dirty(trans
, leaf
);
2630 btrfs_free_path(path
);
2634 int btrfs_init_new_device(struct btrfs_fs_info
*fs_info
, const char *device_path
)
2636 struct btrfs_root
*root
= fs_info
->dev_root
;
2637 struct btrfs_trans_handle
*trans
;
2638 struct btrfs_device
*device
;
2639 struct file
*bdev_file
;
2640 struct super_block
*sb
= fs_info
->sb
;
2641 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
2642 struct btrfs_fs_devices
*seed_devices
= NULL
;
2643 u64 orig_super_total_bytes
;
2644 u64 orig_super_num_devices
;
2646 bool seeding_dev
= false;
2647 bool locked
= false;
2649 if (sb_rdonly(sb
) && !fs_devices
->seeding
)
2652 bdev_file
= bdev_file_open_by_path(device_path
, BLK_OPEN_WRITE
,
2653 fs_info
->bdev_holder
, NULL
);
2654 if (IS_ERR(bdev_file
))
2655 return PTR_ERR(bdev_file
);
2657 if (!btrfs_check_device_zone_type(fs_info
, file_bdev(bdev_file
))) {
2662 if (fs_devices
->seeding
) {
2664 down_write(&sb
->s_umount
);
2665 mutex_lock(&uuid_mutex
);
2669 sync_blockdev(file_bdev(bdev_file
));
2672 list_for_each_entry_rcu(device
, &fs_devices
->devices
, dev_list
) {
2673 if (device
->bdev
== file_bdev(bdev_file
)) {
2681 device
= btrfs_alloc_device(fs_info
, NULL
, NULL
, device_path
);
2682 if (IS_ERR(device
)) {
2683 /* we can safely leave the fs_devices entry around */
2684 ret
= PTR_ERR(device
);
2688 device
->fs_info
= fs_info
;
2689 device
->bdev_file
= bdev_file
;
2690 device
->bdev
= file_bdev(bdev_file
);
2691 ret
= lookup_bdev(device_path
, &device
->devt
);
2693 goto error_free_device
;
2695 ret
= btrfs_get_dev_zone_info(device
, false);
2697 goto error_free_device
;
2699 trans
= btrfs_start_transaction(root
, 0);
2700 if (IS_ERR(trans
)) {
2701 ret
= PTR_ERR(trans
);
2702 goto error_free_zone
;
2705 set_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
);
2706 device
->generation
= trans
->transid
;
2707 device
->io_width
= fs_info
->sectorsize
;
2708 device
->io_align
= fs_info
->sectorsize
;
2709 device
->sector_size
= fs_info
->sectorsize
;
2710 device
->total_bytes
=
2711 round_down(bdev_nr_bytes(device
->bdev
), fs_info
->sectorsize
);
2712 device
->disk_total_bytes
= device
->total_bytes
;
2713 device
->commit_total_bytes
= device
->total_bytes
;
2714 set_bit(BTRFS_DEV_STATE_IN_FS_METADATA
, &device
->dev_state
);
2715 clear_bit(BTRFS_DEV_STATE_REPLACE_TGT
, &device
->dev_state
);
2716 device
->dev_stats_valid
= 1;
2717 set_blocksize(device
->bdev
, BTRFS_BDEV_BLOCKSIZE
);
2720 btrfs_clear_sb_rdonly(sb
);
2722 /* GFP_KERNEL allocation must not be under device_list_mutex */
2723 seed_devices
= btrfs_init_sprout(fs_info
);
2724 if (IS_ERR(seed_devices
)) {
2725 ret
= PTR_ERR(seed_devices
);
2726 btrfs_abort_transaction(trans
, ret
);
2731 mutex_lock(&fs_devices
->device_list_mutex
);
2733 btrfs_setup_sprout(fs_info
, seed_devices
);
2734 btrfs_assign_next_active_device(fs_info
->fs_devices
->latest_dev
,
2738 device
->fs_devices
= fs_devices
;
2740 mutex_lock(&fs_info
->chunk_mutex
);
2741 list_add_rcu(&device
->dev_list
, &fs_devices
->devices
);
2742 list_add(&device
->dev_alloc_list
, &fs_devices
->alloc_list
);
2743 fs_devices
->num_devices
++;
2744 fs_devices
->open_devices
++;
2745 fs_devices
->rw_devices
++;
2746 fs_devices
->total_devices
++;
2747 fs_devices
->total_rw_bytes
+= device
->total_bytes
;
2749 atomic64_add(device
->total_bytes
, &fs_info
->free_chunk_space
);
2751 if (!bdev_nonrot(device
->bdev
))
2752 fs_devices
->rotating
= true;
2754 orig_super_total_bytes
= btrfs_super_total_bytes(fs_info
->super_copy
);
2755 btrfs_set_super_total_bytes(fs_info
->super_copy
,
2756 round_down(orig_super_total_bytes
+ device
->total_bytes
,
2757 fs_info
->sectorsize
));
2759 orig_super_num_devices
= btrfs_super_num_devices(fs_info
->super_copy
);
2760 btrfs_set_super_num_devices(fs_info
->super_copy
,
2761 orig_super_num_devices
+ 1);
2764 * we've got more storage, clear any full flags on the space
2767 btrfs_clear_space_info_full(fs_info
);
2769 mutex_unlock(&fs_info
->chunk_mutex
);
2771 /* Add sysfs device entry */
2772 btrfs_sysfs_add_device(device
);
2774 mutex_unlock(&fs_devices
->device_list_mutex
);
2777 mutex_lock(&fs_info
->chunk_mutex
);
2778 ret
= init_first_rw_device(trans
);
2779 mutex_unlock(&fs_info
->chunk_mutex
);
2781 btrfs_abort_transaction(trans
, ret
);
2786 ret
= btrfs_add_dev_item(trans
, device
);
2788 btrfs_abort_transaction(trans
, ret
);
2793 ret
= btrfs_finish_sprout(trans
);
2795 btrfs_abort_transaction(trans
, ret
);
2800 * fs_devices now represents the newly sprouted filesystem and
2801 * its fsid has been changed by btrfs_sprout_splice().
2803 btrfs_sysfs_update_sprout_fsid(fs_devices
);
2806 ret
= btrfs_commit_transaction(trans
);
2809 mutex_unlock(&uuid_mutex
);
2810 up_write(&sb
->s_umount
);
2813 if (ret
) /* transaction commit */
2816 ret
= btrfs_relocate_sys_chunks(fs_info
);
2818 btrfs_handle_fs_error(fs_info
, ret
,
2819 "Failed to relocate sys chunks after device initialization. This can be fixed using the \"btrfs balance\" command.");
2820 trans
= btrfs_attach_transaction(root
);
2821 if (IS_ERR(trans
)) {
2822 if (PTR_ERR(trans
) == -ENOENT
)
2824 ret
= PTR_ERR(trans
);
2828 ret
= btrfs_commit_transaction(trans
);
2832 * Now that we have written a new super block to this device, check all
2833 * other fs_devices list if device_path alienates any other scanned
2835 * We can ignore the return value as it typically returns -EINVAL and
2836 * only succeeds if the device was an alien.
2838 btrfs_forget_devices(device
->devt
);
2840 /* Update ctime/mtime for blkid or udev */
2841 update_dev_time(device_path
);
2846 btrfs_sysfs_remove_device(device
);
2847 mutex_lock(&fs_info
->fs_devices
->device_list_mutex
);
2848 mutex_lock(&fs_info
->chunk_mutex
);
2849 list_del_rcu(&device
->dev_list
);
2850 list_del(&device
->dev_alloc_list
);
2851 fs_info
->fs_devices
->num_devices
--;
2852 fs_info
->fs_devices
->open_devices
--;
2853 fs_info
->fs_devices
->rw_devices
--;
2854 fs_info
->fs_devices
->total_devices
--;
2855 fs_info
->fs_devices
->total_rw_bytes
-= device
->total_bytes
;
2856 atomic64_sub(device
->total_bytes
, &fs_info
->free_chunk_space
);
2857 btrfs_set_super_total_bytes(fs_info
->super_copy
,
2858 orig_super_total_bytes
);
2859 btrfs_set_super_num_devices(fs_info
->super_copy
,
2860 orig_super_num_devices
);
2861 mutex_unlock(&fs_info
->chunk_mutex
);
2862 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
2865 btrfs_set_sb_rdonly(sb
);
2867 btrfs_end_transaction(trans
);
2869 btrfs_destroy_dev_zone_info(device
);
2871 btrfs_free_device(device
);
2875 mutex_unlock(&uuid_mutex
);
2876 up_write(&sb
->s_umount
);
2881 static noinline
int btrfs_update_device(struct btrfs_trans_handle
*trans
,
2882 struct btrfs_device
*device
)
2885 struct btrfs_path
*path
;
2886 struct btrfs_root
*root
= device
->fs_info
->chunk_root
;
2887 struct btrfs_dev_item
*dev_item
;
2888 struct extent_buffer
*leaf
;
2889 struct btrfs_key key
;
2891 path
= btrfs_alloc_path();
2895 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
2896 key
.type
= BTRFS_DEV_ITEM_KEY
;
2897 key
.offset
= device
->devid
;
2899 ret
= btrfs_search_slot(trans
, root
, &key
, path
, 0, 1);
2908 leaf
= path
->nodes
[0];
2909 dev_item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_dev_item
);
2911 btrfs_set_device_id(leaf
, dev_item
, device
->devid
);
2912 btrfs_set_device_type(leaf
, dev_item
, device
->type
);
2913 btrfs_set_device_io_align(leaf
, dev_item
, device
->io_align
);
2914 btrfs_set_device_io_width(leaf
, dev_item
, device
->io_width
);
2915 btrfs_set_device_sector_size(leaf
, dev_item
, device
->sector_size
);
2916 btrfs_set_device_total_bytes(leaf
, dev_item
,
2917 btrfs_device_get_disk_total_bytes(device
));
2918 btrfs_set_device_bytes_used(leaf
, dev_item
,
2919 btrfs_device_get_bytes_used(device
));
2920 btrfs_mark_buffer_dirty(trans
, leaf
);
2923 btrfs_free_path(path
);
2927 int btrfs_grow_device(struct btrfs_trans_handle
*trans
,
2928 struct btrfs_device
*device
, u64 new_size
)
2930 struct btrfs_fs_info
*fs_info
= device
->fs_info
;
2931 struct btrfs_super_block
*super_copy
= fs_info
->super_copy
;
2936 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
))
2939 new_size
= round_down(new_size
, fs_info
->sectorsize
);
2941 mutex_lock(&fs_info
->chunk_mutex
);
2942 old_total
= btrfs_super_total_bytes(super_copy
);
2943 diff
= round_down(new_size
- device
->total_bytes
, fs_info
->sectorsize
);
2945 if (new_size
<= device
->total_bytes
||
2946 test_bit(BTRFS_DEV_STATE_REPLACE_TGT
, &device
->dev_state
)) {
2947 mutex_unlock(&fs_info
->chunk_mutex
);
2951 btrfs_set_super_total_bytes(super_copy
,
2952 round_down(old_total
+ diff
, fs_info
->sectorsize
));
2953 device
->fs_devices
->total_rw_bytes
+= diff
;
2954 atomic64_add(diff
, &fs_info
->free_chunk_space
);
2956 btrfs_device_set_total_bytes(device
, new_size
);
2957 btrfs_device_set_disk_total_bytes(device
, new_size
);
2958 btrfs_clear_space_info_full(device
->fs_info
);
2959 if (list_empty(&device
->post_commit_list
))
2960 list_add_tail(&device
->post_commit_list
,
2961 &trans
->transaction
->dev_update_list
);
2962 mutex_unlock(&fs_info
->chunk_mutex
);
2964 btrfs_reserve_chunk_metadata(trans
, false);
2965 ret
= btrfs_update_device(trans
, device
);
2966 btrfs_trans_release_chunk_metadata(trans
);
2971 static int btrfs_free_chunk(struct btrfs_trans_handle
*trans
, u64 chunk_offset
)
2973 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
2974 struct btrfs_root
*root
= fs_info
->chunk_root
;
2976 struct btrfs_path
*path
;
2977 struct btrfs_key key
;
2979 path
= btrfs_alloc_path();
2983 key
.objectid
= BTRFS_FIRST_CHUNK_TREE_OBJECTID
;
2984 key
.offset
= chunk_offset
;
2985 key
.type
= BTRFS_CHUNK_ITEM_KEY
;
2987 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
2990 else if (ret
> 0) { /* Logic error or corruption */
2991 btrfs_handle_fs_error(fs_info
, -ENOENT
,
2992 "Failed lookup while freeing chunk.");
2997 ret
= btrfs_del_item(trans
, root
, path
);
2999 btrfs_handle_fs_error(fs_info
, ret
,
3000 "Failed to delete chunk item.");
3002 btrfs_free_path(path
);
3006 static int btrfs_del_sys_chunk(struct btrfs_fs_info
*fs_info
, u64 chunk_offset
)
3008 struct btrfs_super_block
*super_copy
= fs_info
->super_copy
;
3009 struct btrfs_disk_key
*disk_key
;
3010 struct btrfs_chunk
*chunk
;
3017 struct btrfs_key key
;
3019 lockdep_assert_held(&fs_info
->chunk_mutex
);
3020 array_size
= btrfs_super_sys_array_size(super_copy
);
3022 ptr
= super_copy
->sys_chunk_array
;
3025 while (cur
< array_size
) {
3026 disk_key
= (struct btrfs_disk_key
*)ptr
;
3027 btrfs_disk_key_to_cpu(&key
, disk_key
);
3029 len
= sizeof(*disk_key
);
3031 if (key
.type
== BTRFS_CHUNK_ITEM_KEY
) {
3032 chunk
= (struct btrfs_chunk
*)(ptr
+ len
);
3033 num_stripes
= btrfs_stack_chunk_num_stripes(chunk
);
3034 len
+= btrfs_chunk_item_size(num_stripes
);
3039 if (key
.objectid
== BTRFS_FIRST_CHUNK_TREE_OBJECTID
&&
3040 key
.offset
== chunk_offset
) {
3041 memmove(ptr
, ptr
+ len
, array_size
- (cur
+ len
));
3043 btrfs_set_super_sys_array_size(super_copy
, array_size
);
3052 struct btrfs_chunk_map
*btrfs_find_chunk_map_nolock(struct btrfs_fs_info
*fs_info
,
3053 u64 logical
, u64 length
)
3055 struct rb_node
*node
= fs_info
->mapping_tree
.rb_root
.rb_node
;
3056 struct rb_node
*prev
= NULL
;
3057 struct rb_node
*orig_prev
;
3058 struct btrfs_chunk_map
*map
;
3059 struct btrfs_chunk_map
*prev_map
= NULL
;
3062 map
= rb_entry(node
, struct btrfs_chunk_map
, rb_node
);
3066 if (logical
< map
->start
) {
3067 node
= node
->rb_left
;
3068 } else if (logical
>= map
->start
+ map
->chunk_len
) {
3069 node
= node
->rb_right
;
3071 refcount_inc(&map
->refs
);
3080 while (prev
&& logical
>= prev_map
->start
+ prev_map
->chunk_len
) {
3081 prev
= rb_next(prev
);
3082 prev_map
= rb_entry(prev
, struct btrfs_chunk_map
, rb_node
);
3087 prev_map
= rb_entry(prev
, struct btrfs_chunk_map
, rb_node
);
3088 while (prev
&& logical
< prev_map
->start
) {
3089 prev
= rb_prev(prev
);
3090 prev_map
= rb_entry(prev
, struct btrfs_chunk_map
, rb_node
);
3095 u64 end
= logical
+ length
;
3098 * Caller can pass a U64_MAX length when it wants to get any
3099 * chunk starting at an offset of 'logical' or higher, so deal
3100 * with underflow by resetting the end offset to U64_MAX.
3105 if (end
> prev_map
->start
&&
3106 logical
< prev_map
->start
+ prev_map
->chunk_len
) {
3107 refcount_inc(&prev_map
->refs
);
3115 struct btrfs_chunk_map
*btrfs_find_chunk_map(struct btrfs_fs_info
*fs_info
,
3116 u64 logical
, u64 length
)
3118 struct btrfs_chunk_map
*map
;
3120 read_lock(&fs_info
->mapping_tree_lock
);
3121 map
= btrfs_find_chunk_map_nolock(fs_info
, logical
, length
);
3122 read_unlock(&fs_info
->mapping_tree_lock
);
3128 * Find the mapping containing the given logical extent.
3130 * @logical: Logical block offset in bytes.
3131 * @length: Length of extent in bytes.
3133 * Return: Chunk mapping or ERR_PTR.
3135 struct btrfs_chunk_map
*btrfs_get_chunk_map(struct btrfs_fs_info
*fs_info
,
3136 u64 logical
, u64 length
)
3138 struct btrfs_chunk_map
*map
;
3140 map
= btrfs_find_chunk_map(fs_info
, logical
, length
);
3142 if (unlikely(!map
)) {
3144 "unable to find chunk map for logical %llu length %llu",
3146 return ERR_PTR(-EINVAL
);
3149 if (unlikely(map
->start
> logical
|| map
->start
+ map
->chunk_len
<= logical
)) {
3151 "found a bad chunk map, wanted %llu-%llu, found %llu-%llu",
3152 logical
, logical
+ length
, map
->start
,
3153 map
->start
+ map
->chunk_len
);
3154 btrfs_free_chunk_map(map
);
3155 return ERR_PTR(-EINVAL
);
3158 /* Callers are responsible for dropping the reference. */
3162 static int remove_chunk_item(struct btrfs_trans_handle
*trans
,
3163 struct btrfs_chunk_map
*map
, u64 chunk_offset
)
3168 * Removing chunk items and updating the device items in the chunks btree
3169 * requires holding the chunk_mutex.
3170 * See the comment at btrfs_chunk_alloc() for the details.
3172 lockdep_assert_held(&trans
->fs_info
->chunk_mutex
);
3174 for (i
= 0; i
< map
->num_stripes
; i
++) {
3177 ret
= btrfs_update_device(trans
, map
->stripes
[i
].dev
);
3182 return btrfs_free_chunk(trans
, chunk_offset
);
3185 int btrfs_remove_chunk(struct btrfs_trans_handle
*trans
, u64 chunk_offset
)
3187 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
3188 struct btrfs_chunk_map
*map
;
3189 u64 dev_extent_len
= 0;
3191 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
3193 map
= btrfs_get_chunk_map(fs_info
, chunk_offset
, 1);
3196 * This is a logic error, but we don't want to just rely on the
3197 * user having built with ASSERT enabled, so if ASSERT doesn't
3198 * do anything we still error out.
3201 return PTR_ERR(map
);
3205 * First delete the device extent items from the devices btree.
3206 * We take the device_list_mutex to avoid racing with the finishing phase
3207 * of a device replace operation. See the comment below before acquiring
3208 * fs_info->chunk_mutex. Note that here we do not acquire the chunk_mutex
3209 * because that can result in a deadlock when deleting the device extent
3210 * items from the devices btree - COWing an extent buffer from the btree
3211 * may result in allocating a new metadata chunk, which would attempt to
3212 * lock again fs_info->chunk_mutex.
3214 mutex_lock(&fs_devices
->device_list_mutex
);
3215 for (i
= 0; i
< map
->num_stripes
; i
++) {
3216 struct btrfs_device
*device
= map
->stripes
[i
].dev
;
3217 ret
= btrfs_free_dev_extent(trans
, device
,
3218 map
->stripes
[i
].physical
,
3221 mutex_unlock(&fs_devices
->device_list_mutex
);
3222 btrfs_abort_transaction(trans
, ret
);
3226 if (device
->bytes_used
> 0) {
3227 mutex_lock(&fs_info
->chunk_mutex
);
3228 btrfs_device_set_bytes_used(device
,
3229 device
->bytes_used
- dev_extent_len
);
3230 atomic64_add(dev_extent_len
, &fs_info
->free_chunk_space
);
3231 btrfs_clear_space_info_full(fs_info
);
3232 mutex_unlock(&fs_info
->chunk_mutex
);
3235 mutex_unlock(&fs_devices
->device_list_mutex
);
3238 * We acquire fs_info->chunk_mutex for 2 reasons:
3240 * 1) Just like with the first phase of the chunk allocation, we must
3241 * reserve system space, do all chunk btree updates and deletions, and
3242 * update the system chunk array in the superblock while holding this
3243 * mutex. This is for similar reasons as explained on the comment at
3244 * the top of btrfs_chunk_alloc();
3246 * 2) Prevent races with the final phase of a device replace operation
3247 * that replaces the device object associated with the map's stripes,
3248 * because the device object's id can change at any time during that
3249 * final phase of the device replace operation
3250 * (dev-replace.c:btrfs_dev_replace_finishing()), so we could grab the
3251 * replaced device and then see it with an ID of
3252 * BTRFS_DEV_REPLACE_DEVID, which would cause a failure when updating
3253 * the device item, which does not exists on the chunk btree.
3254 * The finishing phase of device replace acquires both the
3255 * device_list_mutex and the chunk_mutex, in that order, so we are
3256 * safe by just acquiring the chunk_mutex.
3258 trans
->removing_chunk
= true;
3259 mutex_lock(&fs_info
->chunk_mutex
);
3261 check_system_chunk(trans
, map
->type
);
3263 ret
= remove_chunk_item(trans
, map
, chunk_offset
);
3265 * Normally we should not get -ENOSPC since we reserved space before
3266 * through the call to check_system_chunk().
3268 * Despite our system space_info having enough free space, we may not
3269 * be able to allocate extents from its block groups, because all have
3270 * an incompatible profile, which will force us to allocate a new system
3271 * block group with the right profile, or right after we called
3272 * check_system_space() above, a scrub turned the only system block group
3273 * with enough free space into RO mode.
3274 * This is explained with more detail at do_chunk_alloc().
3276 * So if we get -ENOSPC, allocate a new system chunk and retry once.
3278 if (ret
== -ENOSPC
) {
3279 const u64 sys_flags
= btrfs_system_alloc_profile(fs_info
);
3280 struct btrfs_block_group
*sys_bg
;
3282 sys_bg
= btrfs_create_chunk(trans
, sys_flags
);
3283 if (IS_ERR(sys_bg
)) {
3284 ret
= PTR_ERR(sys_bg
);
3285 btrfs_abort_transaction(trans
, ret
);
3289 ret
= btrfs_chunk_alloc_add_chunk_item(trans
, sys_bg
);
3291 btrfs_abort_transaction(trans
, ret
);
3295 ret
= remove_chunk_item(trans
, map
, chunk_offset
);
3297 btrfs_abort_transaction(trans
, ret
);
3301 btrfs_abort_transaction(trans
, ret
);
3305 trace_btrfs_chunk_free(fs_info
, map
, chunk_offset
, map
->chunk_len
);
3307 if (map
->type
& BTRFS_BLOCK_GROUP_SYSTEM
) {
3308 ret
= btrfs_del_sys_chunk(fs_info
, chunk_offset
);
3310 btrfs_abort_transaction(trans
, ret
);
3315 mutex_unlock(&fs_info
->chunk_mutex
);
3316 trans
->removing_chunk
= false;
3319 * We are done with chunk btree updates and deletions, so release the
3320 * system space we previously reserved (with check_system_chunk()).
3322 btrfs_trans_release_chunk_metadata(trans
);
3324 ret
= btrfs_remove_block_group(trans
, map
);
3326 btrfs_abort_transaction(trans
, ret
);
3331 if (trans
->removing_chunk
) {
3332 mutex_unlock(&fs_info
->chunk_mutex
);
3333 trans
->removing_chunk
= false;
3336 btrfs_free_chunk_map(map
);
3340 int btrfs_relocate_chunk(struct btrfs_fs_info
*fs_info
, u64 chunk_offset
)
3342 struct btrfs_root
*root
= fs_info
->chunk_root
;
3343 struct btrfs_trans_handle
*trans
;
3344 struct btrfs_block_group
*block_group
;
3348 if (btrfs_fs_incompat(fs_info
, EXTENT_TREE_V2
)) {
3350 "relocate: not supported on extent tree v2 yet");
3355 * Prevent races with automatic removal of unused block groups.
3356 * After we relocate and before we remove the chunk with offset
3357 * chunk_offset, automatic removal of the block group can kick in,
3358 * resulting in a failure when calling btrfs_remove_chunk() below.
3360 * Make sure to acquire this mutex before doing a tree search (dev
3361 * or chunk trees) to find chunks. Otherwise the cleaner kthread might
3362 * call btrfs_remove_chunk() (through btrfs_delete_unused_bgs()) after
3363 * we release the path used to search the chunk/dev tree and before
3364 * the current task acquires this mutex and calls us.
3366 lockdep_assert_held(&fs_info
->reclaim_bgs_lock
);
3368 /* step one, relocate all the extents inside this chunk */
3369 btrfs_scrub_pause(fs_info
);
3370 ret
= btrfs_relocate_block_group(fs_info
, chunk_offset
);
3371 btrfs_scrub_continue(fs_info
);
3374 * If we had a transaction abort, stop all running scrubs.
3375 * See transaction.c:cleanup_transaction() why we do it here.
3377 if (BTRFS_FS_ERROR(fs_info
))
3378 btrfs_scrub_cancel(fs_info
);
3382 block_group
= btrfs_lookup_block_group(fs_info
, chunk_offset
);
3385 btrfs_discard_cancel_work(&fs_info
->discard_ctl
, block_group
);
3386 length
= block_group
->length
;
3387 btrfs_put_block_group(block_group
);
3390 * On a zoned file system, discard the whole block group, this will
3391 * trigger a REQ_OP_ZONE_RESET operation on the device zone. If
3392 * resetting the zone fails, don't treat it as a fatal problem from the
3393 * filesystem's point of view.
3395 if (btrfs_is_zoned(fs_info
)) {
3396 ret
= btrfs_discard_extent(fs_info
, chunk_offset
, length
, NULL
);
3399 "failed to reset zone %llu after relocation",
3403 trans
= btrfs_start_trans_remove_block_group(root
->fs_info
,
3405 if (IS_ERR(trans
)) {
3406 ret
= PTR_ERR(trans
);
3407 btrfs_handle_fs_error(root
->fs_info
, ret
, NULL
);
3412 * step two, delete the device extents and the
3413 * chunk tree entries
3415 ret
= btrfs_remove_chunk(trans
, chunk_offset
);
3416 btrfs_end_transaction(trans
);
3420 static int btrfs_relocate_sys_chunks(struct btrfs_fs_info
*fs_info
)
3422 struct btrfs_root
*chunk_root
= fs_info
->chunk_root
;
3423 struct btrfs_path
*path
;
3424 struct extent_buffer
*leaf
;
3425 struct btrfs_chunk
*chunk
;
3426 struct btrfs_key key
;
3427 struct btrfs_key found_key
;
3429 bool retried
= false;
3433 path
= btrfs_alloc_path();
3438 key
.objectid
= BTRFS_FIRST_CHUNK_TREE_OBJECTID
;
3439 key
.offset
= (u64
)-1;
3440 key
.type
= BTRFS_CHUNK_ITEM_KEY
;
3443 mutex_lock(&fs_info
->reclaim_bgs_lock
);
3444 ret
= btrfs_search_slot(NULL
, chunk_root
, &key
, path
, 0, 0);
3446 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
3451 * On the first search we would find chunk tree with
3452 * offset -1, which is not possible. On subsequent
3453 * loops this would find an existing item on an invalid
3454 * offset (one less than the previous one, wrong
3455 * alignment and size).
3458 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
3462 ret
= btrfs_previous_item(chunk_root
, path
, key
.objectid
,
3465 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
3471 leaf
= path
->nodes
[0];
3472 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
3474 chunk
= btrfs_item_ptr(leaf
, path
->slots
[0],
3475 struct btrfs_chunk
);
3476 chunk_type
= btrfs_chunk_type(leaf
, chunk
);
3477 btrfs_release_path(path
);
3479 if (chunk_type
& BTRFS_BLOCK_GROUP_SYSTEM
) {
3480 ret
= btrfs_relocate_chunk(fs_info
, found_key
.offset
);
3486 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
3488 if (found_key
.offset
== 0)
3490 key
.offset
= found_key
.offset
- 1;
3493 if (failed
&& !retried
) {
3497 } else if (WARN_ON(failed
&& retried
)) {
3501 btrfs_free_path(path
);
3506 * return 1 : allocate a data chunk successfully,
3507 * return <0: errors during allocating a data chunk,
3508 * return 0 : no need to allocate a data chunk.
3510 static int btrfs_may_alloc_data_chunk(struct btrfs_fs_info
*fs_info
,
3513 struct btrfs_block_group
*cache
;
3517 cache
= btrfs_lookup_block_group(fs_info
, chunk_offset
);
3519 chunk_type
= cache
->flags
;
3520 btrfs_put_block_group(cache
);
3522 if (!(chunk_type
& BTRFS_BLOCK_GROUP_DATA
))
3525 spin_lock(&fs_info
->data_sinfo
->lock
);
3526 bytes_used
= fs_info
->data_sinfo
->bytes_used
;
3527 spin_unlock(&fs_info
->data_sinfo
->lock
);
3530 struct btrfs_trans_handle
*trans
;
3533 trans
= btrfs_join_transaction(fs_info
->tree_root
);
3535 return PTR_ERR(trans
);
3537 ret
= btrfs_force_chunk_alloc(trans
, BTRFS_BLOCK_GROUP_DATA
);
3538 btrfs_end_transaction(trans
);
3547 static void btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args
*cpu
,
3548 const struct btrfs_disk_balance_args
*disk
)
3550 memset(cpu
, 0, sizeof(*cpu
));
3552 cpu
->profiles
= le64_to_cpu(disk
->profiles
);
3553 cpu
->usage
= le64_to_cpu(disk
->usage
);
3554 cpu
->devid
= le64_to_cpu(disk
->devid
);
3555 cpu
->pstart
= le64_to_cpu(disk
->pstart
);
3556 cpu
->pend
= le64_to_cpu(disk
->pend
);
3557 cpu
->vstart
= le64_to_cpu(disk
->vstart
);
3558 cpu
->vend
= le64_to_cpu(disk
->vend
);
3559 cpu
->target
= le64_to_cpu(disk
->target
);
3560 cpu
->flags
= le64_to_cpu(disk
->flags
);
3561 cpu
->limit
= le64_to_cpu(disk
->limit
);
3562 cpu
->stripes_min
= le32_to_cpu(disk
->stripes_min
);
3563 cpu
->stripes_max
= le32_to_cpu(disk
->stripes_max
);
3566 static void btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args
*disk
,
3567 const struct btrfs_balance_args
*cpu
)
3569 memset(disk
, 0, sizeof(*disk
));
3571 disk
->profiles
= cpu_to_le64(cpu
->profiles
);
3572 disk
->usage
= cpu_to_le64(cpu
->usage
);
3573 disk
->devid
= cpu_to_le64(cpu
->devid
);
3574 disk
->pstart
= cpu_to_le64(cpu
->pstart
);
3575 disk
->pend
= cpu_to_le64(cpu
->pend
);
3576 disk
->vstart
= cpu_to_le64(cpu
->vstart
);
3577 disk
->vend
= cpu_to_le64(cpu
->vend
);
3578 disk
->target
= cpu_to_le64(cpu
->target
);
3579 disk
->flags
= cpu_to_le64(cpu
->flags
);
3580 disk
->limit
= cpu_to_le64(cpu
->limit
);
3581 disk
->stripes_min
= cpu_to_le32(cpu
->stripes_min
);
3582 disk
->stripes_max
= cpu_to_le32(cpu
->stripes_max
);
3585 static int insert_balance_item(struct btrfs_fs_info
*fs_info
,
3586 struct btrfs_balance_control
*bctl
)
3588 struct btrfs_root
*root
= fs_info
->tree_root
;
3589 struct btrfs_trans_handle
*trans
;
3590 struct btrfs_balance_item
*item
;
3591 struct btrfs_disk_balance_args disk_bargs
;
3592 struct btrfs_path
*path
;
3593 struct extent_buffer
*leaf
;
3594 struct btrfs_key key
;
3597 path
= btrfs_alloc_path();
3601 trans
= btrfs_start_transaction(root
, 0);
3602 if (IS_ERR(trans
)) {
3603 btrfs_free_path(path
);
3604 return PTR_ERR(trans
);
3607 key
.objectid
= BTRFS_BALANCE_OBJECTID
;
3608 key
.type
= BTRFS_TEMPORARY_ITEM_KEY
;
3611 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
3616 leaf
= path
->nodes
[0];
3617 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_balance_item
);
3619 memzero_extent_buffer(leaf
, (unsigned long)item
, sizeof(*item
));
3621 btrfs_cpu_balance_args_to_disk(&disk_bargs
, &bctl
->data
);
3622 btrfs_set_balance_data(leaf
, item
, &disk_bargs
);
3623 btrfs_cpu_balance_args_to_disk(&disk_bargs
, &bctl
->meta
);
3624 btrfs_set_balance_meta(leaf
, item
, &disk_bargs
);
3625 btrfs_cpu_balance_args_to_disk(&disk_bargs
, &bctl
->sys
);
3626 btrfs_set_balance_sys(leaf
, item
, &disk_bargs
);
3628 btrfs_set_balance_flags(leaf
, item
, bctl
->flags
);
3630 btrfs_mark_buffer_dirty(trans
, leaf
);
3632 btrfs_free_path(path
);
3633 err
= btrfs_commit_transaction(trans
);
3639 static int del_balance_item(struct btrfs_fs_info
*fs_info
)
3641 struct btrfs_root
*root
= fs_info
->tree_root
;
3642 struct btrfs_trans_handle
*trans
;
3643 struct btrfs_path
*path
;
3644 struct btrfs_key key
;
3647 path
= btrfs_alloc_path();
3651 trans
= btrfs_start_transaction_fallback_global_rsv(root
, 0);
3652 if (IS_ERR(trans
)) {
3653 btrfs_free_path(path
);
3654 return PTR_ERR(trans
);
3657 key
.objectid
= BTRFS_BALANCE_OBJECTID
;
3658 key
.type
= BTRFS_TEMPORARY_ITEM_KEY
;
3661 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
3669 ret
= btrfs_del_item(trans
, root
, path
);
3671 btrfs_free_path(path
);
3672 err
= btrfs_commit_transaction(trans
);
3679 * This is a heuristic used to reduce the number of chunks balanced on
3680 * resume after balance was interrupted.
3682 static void update_balance_args(struct btrfs_balance_control
*bctl
)
3685 * Turn on soft mode for chunk types that were being converted.
3687 if (bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)
3688 bctl
->data
.flags
|= BTRFS_BALANCE_ARGS_SOFT
;
3689 if (bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)
3690 bctl
->sys
.flags
|= BTRFS_BALANCE_ARGS_SOFT
;
3691 if (bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)
3692 bctl
->meta
.flags
|= BTRFS_BALANCE_ARGS_SOFT
;
3695 * Turn on usage filter if is not already used. The idea is
3696 * that chunks that we have already balanced should be
3697 * reasonably full. Don't do it for chunks that are being
3698 * converted - that will keep us from relocating unconverted
3699 * (albeit full) chunks.
3701 if (!(bctl
->data
.flags
& BTRFS_BALANCE_ARGS_USAGE
) &&
3702 !(bctl
->data
.flags
& BTRFS_BALANCE_ARGS_USAGE_RANGE
) &&
3703 !(bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)) {
3704 bctl
->data
.flags
|= BTRFS_BALANCE_ARGS_USAGE
;
3705 bctl
->data
.usage
= 90;
3707 if (!(bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_USAGE
) &&
3708 !(bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_USAGE_RANGE
) &&
3709 !(bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)) {
3710 bctl
->sys
.flags
|= BTRFS_BALANCE_ARGS_USAGE
;
3711 bctl
->sys
.usage
= 90;
3713 if (!(bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_USAGE
) &&
3714 !(bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_USAGE_RANGE
) &&
3715 !(bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
)) {
3716 bctl
->meta
.flags
|= BTRFS_BALANCE_ARGS_USAGE
;
3717 bctl
->meta
.usage
= 90;
3722 * Clear the balance status in fs_info and delete the balance item from disk.
3724 static void reset_balance_state(struct btrfs_fs_info
*fs_info
)
3726 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
3729 ASSERT(fs_info
->balance_ctl
);
3731 spin_lock(&fs_info
->balance_lock
);
3732 fs_info
->balance_ctl
= NULL
;
3733 spin_unlock(&fs_info
->balance_lock
);
3736 ret
= del_balance_item(fs_info
);
3738 btrfs_handle_fs_error(fs_info
, ret
, NULL
);
3742 * Balance filters. Return 1 if chunk should be filtered out
3743 * (should not be balanced).
3745 static int chunk_profiles_filter(u64 chunk_type
,
3746 struct btrfs_balance_args
*bargs
)
3748 chunk_type
= chunk_to_extended(chunk_type
) &
3749 BTRFS_EXTENDED_PROFILE_MASK
;
3751 if (bargs
->profiles
& chunk_type
)
3757 static int chunk_usage_range_filter(struct btrfs_fs_info
*fs_info
, u64 chunk_offset
,
3758 struct btrfs_balance_args
*bargs
)
3760 struct btrfs_block_group
*cache
;
3762 u64 user_thresh_min
;
3763 u64 user_thresh_max
;
3766 cache
= btrfs_lookup_block_group(fs_info
, chunk_offset
);
3767 chunk_used
= cache
->used
;
3769 if (bargs
->usage_min
== 0)
3770 user_thresh_min
= 0;
3772 user_thresh_min
= mult_perc(cache
->length
, bargs
->usage_min
);
3774 if (bargs
->usage_max
== 0)
3775 user_thresh_max
= 1;
3776 else if (bargs
->usage_max
> 100)
3777 user_thresh_max
= cache
->length
;
3779 user_thresh_max
= mult_perc(cache
->length
, bargs
->usage_max
);
3781 if (user_thresh_min
<= chunk_used
&& chunk_used
< user_thresh_max
)
3784 btrfs_put_block_group(cache
);
3788 static int chunk_usage_filter(struct btrfs_fs_info
*fs_info
,
3789 u64 chunk_offset
, struct btrfs_balance_args
*bargs
)
3791 struct btrfs_block_group
*cache
;
3792 u64 chunk_used
, user_thresh
;
3795 cache
= btrfs_lookup_block_group(fs_info
, chunk_offset
);
3796 chunk_used
= cache
->used
;
3798 if (bargs
->usage_min
== 0)
3800 else if (bargs
->usage
> 100)
3801 user_thresh
= cache
->length
;
3803 user_thresh
= mult_perc(cache
->length
, bargs
->usage
);
3805 if (chunk_used
< user_thresh
)
3808 btrfs_put_block_group(cache
);
3812 static int chunk_devid_filter(struct extent_buffer
*leaf
,
3813 struct btrfs_chunk
*chunk
,
3814 struct btrfs_balance_args
*bargs
)
3816 struct btrfs_stripe
*stripe
;
3817 int num_stripes
= btrfs_chunk_num_stripes(leaf
, chunk
);
3820 for (i
= 0; i
< num_stripes
; i
++) {
3821 stripe
= btrfs_stripe_nr(chunk
, i
);
3822 if (btrfs_stripe_devid(leaf
, stripe
) == bargs
->devid
)
3829 static u64
calc_data_stripes(u64 type
, int num_stripes
)
3831 const int index
= btrfs_bg_flags_to_raid_index(type
);
3832 const int ncopies
= btrfs_raid_array
[index
].ncopies
;
3833 const int nparity
= btrfs_raid_array
[index
].nparity
;
3835 return (num_stripes
- nparity
) / ncopies
;
3838 /* [pstart, pend) */
3839 static int chunk_drange_filter(struct extent_buffer
*leaf
,
3840 struct btrfs_chunk
*chunk
,
3841 struct btrfs_balance_args
*bargs
)
3843 struct btrfs_stripe
*stripe
;
3844 int num_stripes
= btrfs_chunk_num_stripes(leaf
, chunk
);
3851 if (!(bargs
->flags
& BTRFS_BALANCE_ARGS_DEVID
))
3854 type
= btrfs_chunk_type(leaf
, chunk
);
3855 factor
= calc_data_stripes(type
, num_stripes
);
3857 for (i
= 0; i
< num_stripes
; i
++) {
3858 stripe
= btrfs_stripe_nr(chunk
, i
);
3859 if (btrfs_stripe_devid(leaf
, stripe
) != bargs
->devid
)
3862 stripe_offset
= btrfs_stripe_offset(leaf
, stripe
);
3863 stripe_length
= btrfs_chunk_length(leaf
, chunk
);
3864 stripe_length
= div_u64(stripe_length
, factor
);
3866 if (stripe_offset
< bargs
->pend
&&
3867 stripe_offset
+ stripe_length
> bargs
->pstart
)
3874 /* [vstart, vend) */
3875 static int chunk_vrange_filter(struct extent_buffer
*leaf
,
3876 struct btrfs_chunk
*chunk
,
3878 struct btrfs_balance_args
*bargs
)
3880 if (chunk_offset
< bargs
->vend
&&
3881 chunk_offset
+ btrfs_chunk_length(leaf
, chunk
) > bargs
->vstart
)
3882 /* at least part of the chunk is inside this vrange */
3888 static int chunk_stripes_range_filter(struct extent_buffer
*leaf
,
3889 struct btrfs_chunk
*chunk
,
3890 struct btrfs_balance_args
*bargs
)
3892 int num_stripes
= btrfs_chunk_num_stripes(leaf
, chunk
);
3894 if (bargs
->stripes_min
<= num_stripes
3895 && num_stripes
<= bargs
->stripes_max
)
3901 static int chunk_soft_convert_filter(u64 chunk_type
,
3902 struct btrfs_balance_args
*bargs
)
3904 if (!(bargs
->flags
& BTRFS_BALANCE_ARGS_CONVERT
))
3907 chunk_type
= chunk_to_extended(chunk_type
) &
3908 BTRFS_EXTENDED_PROFILE_MASK
;
3910 if (bargs
->target
== chunk_type
)
3916 static int should_balance_chunk(struct extent_buffer
*leaf
,
3917 struct btrfs_chunk
*chunk
, u64 chunk_offset
)
3919 struct btrfs_fs_info
*fs_info
= leaf
->fs_info
;
3920 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
3921 struct btrfs_balance_args
*bargs
= NULL
;
3922 u64 chunk_type
= btrfs_chunk_type(leaf
, chunk
);
3925 if (!((chunk_type
& BTRFS_BLOCK_GROUP_TYPE_MASK
) &
3926 (bctl
->flags
& BTRFS_BALANCE_TYPE_MASK
))) {
3930 if (chunk_type
& BTRFS_BLOCK_GROUP_DATA
)
3931 bargs
= &bctl
->data
;
3932 else if (chunk_type
& BTRFS_BLOCK_GROUP_SYSTEM
)
3934 else if (chunk_type
& BTRFS_BLOCK_GROUP_METADATA
)
3935 bargs
= &bctl
->meta
;
3937 /* profiles filter */
3938 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_PROFILES
) &&
3939 chunk_profiles_filter(chunk_type
, bargs
)) {
3944 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_USAGE
) &&
3945 chunk_usage_filter(fs_info
, chunk_offset
, bargs
)) {
3947 } else if ((bargs
->flags
& BTRFS_BALANCE_ARGS_USAGE_RANGE
) &&
3948 chunk_usage_range_filter(fs_info
, chunk_offset
, bargs
)) {
3953 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_DEVID
) &&
3954 chunk_devid_filter(leaf
, chunk
, bargs
)) {
3958 /* drange filter, makes sense only with devid filter */
3959 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_DRANGE
) &&
3960 chunk_drange_filter(leaf
, chunk
, bargs
)) {
3965 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_VRANGE
) &&
3966 chunk_vrange_filter(leaf
, chunk
, chunk_offset
, bargs
)) {
3970 /* stripes filter */
3971 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_STRIPES_RANGE
) &&
3972 chunk_stripes_range_filter(leaf
, chunk
, bargs
)) {
3976 /* soft profile changing mode */
3977 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_SOFT
) &&
3978 chunk_soft_convert_filter(chunk_type
, bargs
)) {
3983 * limited by count, must be the last filter
3985 if ((bargs
->flags
& BTRFS_BALANCE_ARGS_LIMIT
)) {
3986 if (bargs
->limit
== 0)
3990 } else if ((bargs
->flags
& BTRFS_BALANCE_ARGS_LIMIT_RANGE
)) {
3992 * Same logic as the 'limit' filter; the minimum cannot be
3993 * determined here because we do not have the global information
3994 * about the count of all chunks that satisfy the filters.
3996 if (bargs
->limit_max
== 0)
4005 static int __btrfs_balance(struct btrfs_fs_info
*fs_info
)
4007 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
4008 struct btrfs_root
*chunk_root
= fs_info
->chunk_root
;
4010 struct btrfs_chunk
*chunk
;
4011 struct btrfs_path
*path
= NULL
;
4012 struct btrfs_key key
;
4013 struct btrfs_key found_key
;
4014 struct extent_buffer
*leaf
;
4017 int enospc_errors
= 0;
4018 bool counting
= true;
4019 /* The single value limit and min/max limits use the same bytes in the */
4020 u64 limit_data
= bctl
->data
.limit
;
4021 u64 limit_meta
= bctl
->meta
.limit
;
4022 u64 limit_sys
= bctl
->sys
.limit
;
4026 int chunk_reserved
= 0;
4028 path
= btrfs_alloc_path();
4034 /* zero out stat counters */
4035 spin_lock(&fs_info
->balance_lock
);
4036 memset(&bctl
->stat
, 0, sizeof(bctl
->stat
));
4037 spin_unlock(&fs_info
->balance_lock
);
4041 * The single value limit and min/max limits use the same bytes
4044 bctl
->data
.limit
= limit_data
;
4045 bctl
->meta
.limit
= limit_meta
;
4046 bctl
->sys
.limit
= limit_sys
;
4048 key
.objectid
= BTRFS_FIRST_CHUNK_TREE_OBJECTID
;
4049 key
.offset
= (u64
)-1;
4050 key
.type
= BTRFS_CHUNK_ITEM_KEY
;
4053 if ((!counting
&& atomic_read(&fs_info
->balance_pause_req
)) ||
4054 atomic_read(&fs_info
->balance_cancel_req
)) {
4059 mutex_lock(&fs_info
->reclaim_bgs_lock
);
4060 ret
= btrfs_search_slot(NULL
, chunk_root
, &key
, path
, 0, 0);
4062 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
4067 * this shouldn't happen, it means the last relocate
4071 BUG(); /* FIXME break ? */
4073 ret
= btrfs_previous_item(chunk_root
, path
, 0,
4074 BTRFS_CHUNK_ITEM_KEY
);
4076 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
4081 leaf
= path
->nodes
[0];
4082 slot
= path
->slots
[0];
4083 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
4085 if (found_key
.objectid
!= key
.objectid
) {
4086 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
4090 chunk
= btrfs_item_ptr(leaf
, slot
, struct btrfs_chunk
);
4091 chunk_type
= btrfs_chunk_type(leaf
, chunk
);
4094 spin_lock(&fs_info
->balance_lock
);
4095 bctl
->stat
.considered
++;
4096 spin_unlock(&fs_info
->balance_lock
);
4099 ret
= should_balance_chunk(leaf
, chunk
, found_key
.offset
);
4101 btrfs_release_path(path
);
4103 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
4108 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
4109 spin_lock(&fs_info
->balance_lock
);
4110 bctl
->stat
.expected
++;
4111 spin_unlock(&fs_info
->balance_lock
);
4113 if (chunk_type
& BTRFS_BLOCK_GROUP_DATA
)
4115 else if (chunk_type
& BTRFS_BLOCK_GROUP_SYSTEM
)
4117 else if (chunk_type
& BTRFS_BLOCK_GROUP_METADATA
)
4124 * Apply limit_min filter, no need to check if the LIMITS
4125 * filter is used, limit_min is 0 by default
4127 if (((chunk_type
& BTRFS_BLOCK_GROUP_DATA
) &&
4128 count_data
< bctl
->data
.limit_min
)
4129 || ((chunk_type
& BTRFS_BLOCK_GROUP_METADATA
) &&
4130 count_meta
< bctl
->meta
.limit_min
)
4131 || ((chunk_type
& BTRFS_BLOCK_GROUP_SYSTEM
) &&
4132 count_sys
< bctl
->sys
.limit_min
)) {
4133 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
4137 if (!chunk_reserved
) {
4139 * We may be relocating the only data chunk we have,
4140 * which could potentially end up with losing data's
4141 * raid profile, so lets allocate an empty one in
4144 ret
= btrfs_may_alloc_data_chunk(fs_info
,
4147 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
4149 } else if (ret
== 1) {
4154 ret
= btrfs_relocate_chunk(fs_info
, found_key
.offset
);
4155 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
4156 if (ret
== -ENOSPC
) {
4158 } else if (ret
== -ETXTBSY
) {
4160 "skipping relocation of block group %llu due to active swapfile",
4166 spin_lock(&fs_info
->balance_lock
);
4167 bctl
->stat
.completed
++;
4168 spin_unlock(&fs_info
->balance_lock
);
4171 if (found_key
.offset
== 0)
4173 key
.offset
= found_key
.offset
- 1;
4177 btrfs_release_path(path
);
4182 btrfs_free_path(path
);
4183 if (enospc_errors
) {
4184 btrfs_info(fs_info
, "%d enospc errors during balance",
4194 * See if a given profile is valid and reduced.
4196 * @flags: profile to validate
4197 * @extended: if true @flags is treated as an extended profile
4199 static int alloc_profile_is_valid(u64 flags
, int extended
)
4201 u64 mask
= (extended
? BTRFS_EXTENDED_PROFILE_MASK
:
4202 BTRFS_BLOCK_GROUP_PROFILE_MASK
);
4204 flags
&= ~BTRFS_BLOCK_GROUP_TYPE_MASK
;
4206 /* 1) check that all other bits are zeroed */
4210 /* 2) see if profile is reduced */
4212 return !extended
; /* "0" is valid for usual profiles */
4214 return has_single_bit_set(flags
);
4218 * Validate target profile against allowed profiles and return true if it's OK.
4219 * Otherwise print the error message and return false.
4221 static inline int validate_convert_profile(struct btrfs_fs_info
*fs_info
,
4222 const struct btrfs_balance_args
*bargs
,
4223 u64 allowed
, const char *type
)
4225 if (!(bargs
->flags
& BTRFS_BALANCE_ARGS_CONVERT
))
4228 /* Profile is valid and does not have bits outside of the allowed set */
4229 if (alloc_profile_is_valid(bargs
->target
, 1) &&
4230 (bargs
->target
& ~allowed
) == 0)
4233 btrfs_err(fs_info
, "balance: invalid convert %s profile %s",
4234 type
, btrfs_bg_type_to_raid_name(bargs
->target
));
4239 * Fill @buf with textual description of balance filter flags @bargs, up to
4240 * @size_buf including the terminating null. The output may be trimmed if it
4241 * does not fit into the provided buffer.
4243 static void describe_balance_args(struct btrfs_balance_args
*bargs
, char *buf
,
4247 u32 size_bp
= size_buf
;
4249 u64 flags
= bargs
->flags
;
4250 char tmp_buf
[128] = {'\0'};
4255 #define CHECK_APPEND_NOARG(a) \
4257 ret = snprintf(bp, size_bp, (a)); \
4258 if (ret < 0 || ret >= size_bp) \
4259 goto out_overflow; \
4264 #define CHECK_APPEND_1ARG(a, v1) \
4266 ret = snprintf(bp, size_bp, (a), (v1)); \
4267 if (ret < 0 || ret >= size_bp) \
4268 goto out_overflow; \
4273 #define CHECK_APPEND_2ARG(a, v1, v2) \
4275 ret = snprintf(bp, size_bp, (a), (v1), (v2)); \
4276 if (ret < 0 || ret >= size_bp) \
4277 goto out_overflow; \
4282 if (flags
& BTRFS_BALANCE_ARGS_CONVERT
)
4283 CHECK_APPEND_1ARG("convert=%s,",
4284 btrfs_bg_type_to_raid_name(bargs
->target
));
4286 if (flags
& BTRFS_BALANCE_ARGS_SOFT
)
4287 CHECK_APPEND_NOARG("soft,");
4289 if (flags
& BTRFS_BALANCE_ARGS_PROFILES
) {
4290 btrfs_describe_block_groups(bargs
->profiles
, tmp_buf
,
4292 CHECK_APPEND_1ARG("profiles=%s,", tmp_buf
);
4295 if (flags
& BTRFS_BALANCE_ARGS_USAGE
)
4296 CHECK_APPEND_1ARG("usage=%llu,", bargs
->usage
);
4298 if (flags
& BTRFS_BALANCE_ARGS_USAGE_RANGE
)
4299 CHECK_APPEND_2ARG("usage=%u..%u,",
4300 bargs
->usage_min
, bargs
->usage_max
);
4302 if (flags
& BTRFS_BALANCE_ARGS_DEVID
)
4303 CHECK_APPEND_1ARG("devid=%llu,", bargs
->devid
);
4305 if (flags
& BTRFS_BALANCE_ARGS_DRANGE
)
4306 CHECK_APPEND_2ARG("drange=%llu..%llu,",
4307 bargs
->pstart
, bargs
->pend
);
4309 if (flags
& BTRFS_BALANCE_ARGS_VRANGE
)
4310 CHECK_APPEND_2ARG("vrange=%llu..%llu,",
4311 bargs
->vstart
, bargs
->vend
);
4313 if (flags
& BTRFS_BALANCE_ARGS_LIMIT
)
4314 CHECK_APPEND_1ARG("limit=%llu,", bargs
->limit
);
4316 if (flags
& BTRFS_BALANCE_ARGS_LIMIT_RANGE
)
4317 CHECK_APPEND_2ARG("limit=%u..%u,",
4318 bargs
->limit_min
, bargs
->limit_max
);
4320 if (flags
& BTRFS_BALANCE_ARGS_STRIPES_RANGE
)
4321 CHECK_APPEND_2ARG("stripes=%u..%u,",
4322 bargs
->stripes_min
, bargs
->stripes_max
);
4324 #undef CHECK_APPEND_2ARG
4325 #undef CHECK_APPEND_1ARG
4326 #undef CHECK_APPEND_NOARG
4330 if (size_bp
< size_buf
)
4331 buf
[size_buf
- size_bp
- 1] = '\0'; /* remove last , */
4336 static void describe_balance_start_or_resume(struct btrfs_fs_info
*fs_info
)
4338 u32 size_buf
= 1024;
4339 char tmp_buf
[192] = {'\0'};
4342 u32 size_bp
= size_buf
;
4344 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
4346 buf
= kzalloc(size_buf
, GFP_KERNEL
);
4352 #define CHECK_APPEND_1ARG(a, v1) \
4354 ret = snprintf(bp, size_bp, (a), (v1)); \
4355 if (ret < 0 || ret >= size_bp) \
4356 goto out_overflow; \
4361 if (bctl
->flags
& BTRFS_BALANCE_FORCE
)
4362 CHECK_APPEND_1ARG("%s", "-f ");
4364 if (bctl
->flags
& BTRFS_BALANCE_DATA
) {
4365 describe_balance_args(&bctl
->data
, tmp_buf
, sizeof(tmp_buf
));
4366 CHECK_APPEND_1ARG("-d%s ", tmp_buf
);
4369 if (bctl
->flags
& BTRFS_BALANCE_METADATA
) {
4370 describe_balance_args(&bctl
->meta
, tmp_buf
, sizeof(tmp_buf
));
4371 CHECK_APPEND_1ARG("-m%s ", tmp_buf
);
4374 if (bctl
->flags
& BTRFS_BALANCE_SYSTEM
) {
4375 describe_balance_args(&bctl
->sys
, tmp_buf
, sizeof(tmp_buf
));
4376 CHECK_APPEND_1ARG("-s%s ", tmp_buf
);
4379 #undef CHECK_APPEND_1ARG
4383 if (size_bp
< size_buf
)
4384 buf
[size_buf
- size_bp
- 1] = '\0'; /* remove last " " */
4385 btrfs_info(fs_info
, "balance: %s %s",
4386 (bctl
->flags
& BTRFS_BALANCE_RESUME
) ?
4387 "resume" : "start", buf
);
4393 * Should be called with balance mutexe held
4395 int btrfs_balance(struct btrfs_fs_info
*fs_info
,
4396 struct btrfs_balance_control
*bctl
,
4397 struct btrfs_ioctl_balance_args
*bargs
)
4399 u64 meta_target
, data_target
;
4405 bool reducing_redundancy
;
4406 bool paused
= false;
4409 if (btrfs_fs_closing(fs_info
) ||
4410 atomic_read(&fs_info
->balance_pause_req
) ||
4411 btrfs_should_cancel_balance(fs_info
)) {
4416 allowed
= btrfs_super_incompat_flags(fs_info
->super_copy
);
4417 if (allowed
& BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS
)
4421 * In case of mixed groups both data and meta should be picked,
4422 * and identical options should be given for both of them.
4424 allowed
= BTRFS_BALANCE_DATA
| BTRFS_BALANCE_METADATA
;
4425 if (mixed
&& (bctl
->flags
& allowed
)) {
4426 if (!(bctl
->flags
& BTRFS_BALANCE_DATA
) ||
4427 !(bctl
->flags
& BTRFS_BALANCE_METADATA
) ||
4428 memcmp(&bctl
->data
, &bctl
->meta
, sizeof(bctl
->data
))) {
4430 "balance: mixed groups data and metadata options must be the same");
4437 * rw_devices will not change at the moment, device add/delete/replace
4440 num_devices
= fs_info
->fs_devices
->rw_devices
;
4443 * SINGLE profile on-disk has no profile bit, but in-memory we have a
4444 * special bit for it, to make it easier to distinguish. Thus we need
4445 * to set it manually, or balance would refuse the profile.
4447 allowed
= BTRFS_AVAIL_ALLOC_BIT_SINGLE
;
4448 for (i
= 0; i
< ARRAY_SIZE(btrfs_raid_array
); i
++)
4449 if (num_devices
>= btrfs_raid_array
[i
].devs_min
)
4450 allowed
|= btrfs_raid_array
[i
].bg_flag
;
4452 if (!validate_convert_profile(fs_info
, &bctl
->data
, allowed
, "data") ||
4453 !validate_convert_profile(fs_info
, &bctl
->meta
, allowed
, "metadata") ||
4454 !validate_convert_profile(fs_info
, &bctl
->sys
, allowed
, "system")) {
4460 * Allow to reduce metadata or system integrity only if force set for
4461 * profiles with redundancy (copies, parity)
4464 for (i
= 0; i
< ARRAY_SIZE(btrfs_raid_array
); i
++) {
4465 if (btrfs_raid_array
[i
].ncopies
>= 2 ||
4466 btrfs_raid_array
[i
].tolerated_failures
>= 1)
4467 allowed
|= btrfs_raid_array
[i
].bg_flag
;
4470 seq
= read_seqbegin(&fs_info
->profiles_lock
);
4472 if (((bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) &&
4473 (fs_info
->avail_system_alloc_bits
& allowed
) &&
4474 !(bctl
->sys
.target
& allowed
)) ||
4475 ((bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) &&
4476 (fs_info
->avail_metadata_alloc_bits
& allowed
) &&
4477 !(bctl
->meta
.target
& allowed
)))
4478 reducing_redundancy
= true;
4480 reducing_redundancy
= false;
4482 /* if we're not converting, the target field is uninitialized */
4483 meta_target
= (bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) ?
4484 bctl
->meta
.target
: fs_info
->avail_metadata_alloc_bits
;
4485 data_target
= (bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) ?
4486 bctl
->data
.target
: fs_info
->avail_data_alloc_bits
;
4487 } while (read_seqretry(&fs_info
->profiles_lock
, seq
));
4489 if (reducing_redundancy
) {
4490 if (bctl
->flags
& BTRFS_BALANCE_FORCE
) {
4492 "balance: force reducing metadata redundancy");
4495 "balance: reduces metadata redundancy, use --force if you want this");
4501 if (btrfs_get_num_tolerated_disk_barrier_failures(meta_target
) <
4502 btrfs_get_num_tolerated_disk_barrier_failures(data_target
)) {
4504 "balance: metadata profile %s has lower redundancy than data profile %s",
4505 btrfs_bg_type_to_raid_name(meta_target
),
4506 btrfs_bg_type_to_raid_name(data_target
));
4509 ret
= insert_balance_item(fs_info
, bctl
);
4510 if (ret
&& ret
!= -EEXIST
)
4513 if (!(bctl
->flags
& BTRFS_BALANCE_RESUME
)) {
4514 BUG_ON(ret
== -EEXIST
);
4515 BUG_ON(fs_info
->balance_ctl
);
4516 spin_lock(&fs_info
->balance_lock
);
4517 fs_info
->balance_ctl
= bctl
;
4518 spin_unlock(&fs_info
->balance_lock
);
4520 BUG_ON(ret
!= -EEXIST
);
4521 spin_lock(&fs_info
->balance_lock
);
4522 update_balance_args(bctl
);
4523 spin_unlock(&fs_info
->balance_lock
);
4526 ASSERT(!test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
));
4527 set_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
);
4528 describe_balance_start_or_resume(fs_info
);
4529 mutex_unlock(&fs_info
->balance_mutex
);
4531 ret
= __btrfs_balance(fs_info
);
4533 mutex_lock(&fs_info
->balance_mutex
);
4534 if (ret
== -ECANCELED
&& atomic_read(&fs_info
->balance_pause_req
)) {
4535 btrfs_info(fs_info
, "balance: paused");
4536 btrfs_exclop_balance(fs_info
, BTRFS_EXCLOP_BALANCE_PAUSED
);
4540 * Balance can be canceled by:
4542 * - Regular cancel request
4543 * Then ret == -ECANCELED and balance_cancel_req > 0
4545 * - Fatal signal to "btrfs" process
4546 * Either the signal caught by wait_reserve_ticket() and callers
4547 * got -EINTR, or caught by btrfs_should_cancel_balance() and
4549 * Either way, in this case balance_cancel_req = 0, and
4550 * ret == -EINTR or ret == -ECANCELED.
4552 * So here we only check the return value to catch canceled balance.
4554 else if (ret
== -ECANCELED
|| ret
== -EINTR
)
4555 btrfs_info(fs_info
, "balance: canceled");
4557 btrfs_info(fs_info
, "balance: ended with status: %d", ret
);
4559 clear_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
);
4562 memset(bargs
, 0, sizeof(*bargs
));
4563 btrfs_update_ioctl_balance_args(fs_info
, bargs
);
4566 /* We didn't pause, we can clean everything up. */
4568 reset_balance_state(fs_info
);
4569 btrfs_exclop_finish(fs_info
);
4572 wake_up(&fs_info
->balance_wait_q
);
4576 if (bctl
->flags
& BTRFS_BALANCE_RESUME
)
4577 reset_balance_state(fs_info
);
4580 btrfs_exclop_finish(fs_info
);
4585 static int balance_kthread(void *data
)
4587 struct btrfs_fs_info
*fs_info
= data
;
4590 sb_start_write(fs_info
->sb
);
4591 mutex_lock(&fs_info
->balance_mutex
);
4592 if (fs_info
->balance_ctl
)
4593 ret
= btrfs_balance(fs_info
, fs_info
->balance_ctl
, NULL
);
4594 mutex_unlock(&fs_info
->balance_mutex
);
4595 sb_end_write(fs_info
->sb
);
4600 int btrfs_resume_balance_async(struct btrfs_fs_info
*fs_info
)
4602 struct task_struct
*tsk
;
4604 mutex_lock(&fs_info
->balance_mutex
);
4605 if (!fs_info
->balance_ctl
) {
4606 mutex_unlock(&fs_info
->balance_mutex
);
4609 mutex_unlock(&fs_info
->balance_mutex
);
4611 if (btrfs_test_opt(fs_info
, SKIP_BALANCE
)) {
4612 btrfs_info(fs_info
, "balance: resume skipped");
4616 spin_lock(&fs_info
->super_lock
);
4617 ASSERT(fs_info
->exclusive_operation
== BTRFS_EXCLOP_BALANCE_PAUSED
);
4618 fs_info
->exclusive_operation
= BTRFS_EXCLOP_BALANCE
;
4619 spin_unlock(&fs_info
->super_lock
);
4621 * A ro->rw remount sequence should continue with the paused balance
4622 * regardless of who pauses it, system or the user as of now, so set
4625 spin_lock(&fs_info
->balance_lock
);
4626 fs_info
->balance_ctl
->flags
|= BTRFS_BALANCE_RESUME
;
4627 spin_unlock(&fs_info
->balance_lock
);
4629 tsk
= kthread_run(balance_kthread
, fs_info
, "btrfs-balance");
4630 return PTR_ERR_OR_ZERO(tsk
);
4633 int btrfs_recover_balance(struct btrfs_fs_info
*fs_info
)
4635 struct btrfs_balance_control
*bctl
;
4636 struct btrfs_balance_item
*item
;
4637 struct btrfs_disk_balance_args disk_bargs
;
4638 struct btrfs_path
*path
;
4639 struct extent_buffer
*leaf
;
4640 struct btrfs_key key
;
4643 path
= btrfs_alloc_path();
4647 key
.objectid
= BTRFS_BALANCE_OBJECTID
;
4648 key
.type
= BTRFS_TEMPORARY_ITEM_KEY
;
4651 ret
= btrfs_search_slot(NULL
, fs_info
->tree_root
, &key
, path
, 0, 0);
4654 if (ret
> 0) { /* ret = -ENOENT; */
4659 bctl
= kzalloc(sizeof(*bctl
), GFP_NOFS
);
4665 leaf
= path
->nodes
[0];
4666 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_balance_item
);
4668 bctl
->flags
= btrfs_balance_flags(leaf
, item
);
4669 bctl
->flags
|= BTRFS_BALANCE_RESUME
;
4671 btrfs_balance_data(leaf
, item
, &disk_bargs
);
4672 btrfs_disk_balance_args_to_cpu(&bctl
->data
, &disk_bargs
);
4673 btrfs_balance_meta(leaf
, item
, &disk_bargs
);
4674 btrfs_disk_balance_args_to_cpu(&bctl
->meta
, &disk_bargs
);
4675 btrfs_balance_sys(leaf
, item
, &disk_bargs
);
4676 btrfs_disk_balance_args_to_cpu(&bctl
->sys
, &disk_bargs
);
4679 * This should never happen, as the paused balance state is recovered
4680 * during mount without any chance of other exclusive ops to collide.
4682 * This gives the exclusive op status to balance and keeps in paused
4683 * state until user intervention (cancel or umount). If the ownership
4684 * cannot be assigned, show a message but do not fail. The balance
4685 * is in a paused state and must have fs_info::balance_ctl properly
4688 if (!btrfs_exclop_start(fs_info
, BTRFS_EXCLOP_BALANCE_PAUSED
))
4690 "balance: cannot set exclusive op status, resume manually");
4692 btrfs_release_path(path
);
4694 mutex_lock(&fs_info
->balance_mutex
);
4695 BUG_ON(fs_info
->balance_ctl
);
4696 spin_lock(&fs_info
->balance_lock
);
4697 fs_info
->balance_ctl
= bctl
;
4698 spin_unlock(&fs_info
->balance_lock
);
4699 mutex_unlock(&fs_info
->balance_mutex
);
4701 btrfs_free_path(path
);
4705 int btrfs_pause_balance(struct btrfs_fs_info
*fs_info
)
4709 mutex_lock(&fs_info
->balance_mutex
);
4710 if (!fs_info
->balance_ctl
) {
4711 mutex_unlock(&fs_info
->balance_mutex
);
4715 if (test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
)) {
4716 atomic_inc(&fs_info
->balance_pause_req
);
4717 mutex_unlock(&fs_info
->balance_mutex
);
4719 wait_event(fs_info
->balance_wait_q
,
4720 !test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
));
4722 mutex_lock(&fs_info
->balance_mutex
);
4723 /* we are good with balance_ctl ripped off from under us */
4724 BUG_ON(test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
));
4725 atomic_dec(&fs_info
->balance_pause_req
);
4730 mutex_unlock(&fs_info
->balance_mutex
);
4734 int btrfs_cancel_balance(struct btrfs_fs_info
*fs_info
)
4736 mutex_lock(&fs_info
->balance_mutex
);
4737 if (!fs_info
->balance_ctl
) {
4738 mutex_unlock(&fs_info
->balance_mutex
);
4743 * A paused balance with the item stored on disk can be resumed at
4744 * mount time if the mount is read-write. Otherwise it's still paused
4745 * and we must not allow cancelling as it deletes the item.
4747 if (sb_rdonly(fs_info
->sb
)) {
4748 mutex_unlock(&fs_info
->balance_mutex
);
4752 atomic_inc(&fs_info
->balance_cancel_req
);
4754 * if we are running just wait and return, balance item is
4755 * deleted in btrfs_balance in this case
4757 if (test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
)) {
4758 mutex_unlock(&fs_info
->balance_mutex
);
4759 wait_event(fs_info
->balance_wait_q
,
4760 !test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
));
4761 mutex_lock(&fs_info
->balance_mutex
);
4763 mutex_unlock(&fs_info
->balance_mutex
);
4765 * Lock released to allow other waiters to continue, we'll
4766 * reexamine the status again.
4768 mutex_lock(&fs_info
->balance_mutex
);
4770 if (fs_info
->balance_ctl
) {
4771 reset_balance_state(fs_info
);
4772 btrfs_exclop_finish(fs_info
);
4773 btrfs_info(fs_info
, "balance: canceled");
4777 ASSERT(!test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
));
4778 atomic_dec(&fs_info
->balance_cancel_req
);
4779 mutex_unlock(&fs_info
->balance_mutex
);
4783 int btrfs_uuid_scan_kthread(void *data
)
4785 struct btrfs_fs_info
*fs_info
= data
;
4786 struct btrfs_root
*root
= fs_info
->tree_root
;
4787 struct btrfs_key key
;
4788 struct btrfs_path
*path
= NULL
;
4790 struct extent_buffer
*eb
;
4792 struct btrfs_root_item root_item
;
4794 struct btrfs_trans_handle
*trans
= NULL
;
4795 bool closing
= false;
4797 path
= btrfs_alloc_path();
4804 key
.type
= BTRFS_ROOT_ITEM_KEY
;
4808 if (btrfs_fs_closing(fs_info
)) {
4812 ret
= btrfs_search_forward(root
, &key
, path
,
4813 BTRFS_OLDEST_GENERATION
);
4820 if (key
.type
!= BTRFS_ROOT_ITEM_KEY
||
4821 (key
.objectid
< BTRFS_FIRST_FREE_OBJECTID
&&
4822 key
.objectid
!= BTRFS_FS_TREE_OBJECTID
) ||
4823 key
.objectid
> BTRFS_LAST_FREE_OBJECTID
)
4826 eb
= path
->nodes
[0];
4827 slot
= path
->slots
[0];
4828 item_size
= btrfs_item_size(eb
, slot
);
4829 if (item_size
< sizeof(root_item
))
4832 read_extent_buffer(eb
, &root_item
,
4833 btrfs_item_ptr_offset(eb
, slot
),
4834 (int)sizeof(root_item
));
4835 if (btrfs_root_refs(&root_item
) == 0)
4838 if (!btrfs_is_empty_uuid(root_item
.uuid
) ||
4839 !btrfs_is_empty_uuid(root_item
.received_uuid
)) {
4843 btrfs_release_path(path
);
4845 * 1 - subvol uuid item
4846 * 1 - received_subvol uuid item
4848 trans
= btrfs_start_transaction(fs_info
->uuid_root
, 2);
4849 if (IS_ERR(trans
)) {
4850 ret
= PTR_ERR(trans
);
4858 btrfs_release_path(path
);
4859 if (!btrfs_is_empty_uuid(root_item
.uuid
)) {
4860 ret
= btrfs_uuid_tree_add(trans
, root_item
.uuid
,
4861 BTRFS_UUID_KEY_SUBVOL
,
4864 btrfs_warn(fs_info
, "uuid_tree_add failed %d",
4870 if (!btrfs_is_empty_uuid(root_item
.received_uuid
)) {
4871 ret
= btrfs_uuid_tree_add(trans
,
4872 root_item
.received_uuid
,
4873 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
4876 btrfs_warn(fs_info
, "uuid_tree_add failed %d",
4883 btrfs_release_path(path
);
4885 ret
= btrfs_end_transaction(trans
);
4891 if (key
.offset
< (u64
)-1) {
4893 } else if (key
.type
< BTRFS_ROOT_ITEM_KEY
) {
4895 key
.type
= BTRFS_ROOT_ITEM_KEY
;
4896 } else if (key
.objectid
< (u64
)-1) {
4898 key
.type
= BTRFS_ROOT_ITEM_KEY
;
4907 btrfs_free_path(path
);
4908 if (trans
&& !IS_ERR(trans
))
4909 btrfs_end_transaction(trans
);
4911 btrfs_warn(fs_info
, "btrfs_uuid_scan_kthread failed %d", ret
);
4913 set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN
, &fs_info
->flags
);
4914 up(&fs_info
->uuid_tree_rescan_sem
);
4918 int btrfs_create_uuid_tree(struct btrfs_fs_info
*fs_info
)
4920 struct btrfs_trans_handle
*trans
;
4921 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
4922 struct btrfs_root
*uuid_root
;
4923 struct task_struct
*task
;
4930 trans
= btrfs_start_transaction(tree_root
, 2);
4932 return PTR_ERR(trans
);
4934 uuid_root
= btrfs_create_tree(trans
, BTRFS_UUID_TREE_OBJECTID
);
4935 if (IS_ERR(uuid_root
)) {
4936 ret
= PTR_ERR(uuid_root
);
4937 btrfs_abort_transaction(trans
, ret
);
4938 btrfs_end_transaction(trans
);
4942 fs_info
->uuid_root
= uuid_root
;
4944 ret
= btrfs_commit_transaction(trans
);
4948 down(&fs_info
->uuid_tree_rescan_sem
);
4949 task
= kthread_run(btrfs_uuid_scan_kthread
, fs_info
, "btrfs-uuid");
4951 /* fs_info->update_uuid_tree_gen remains 0 in all error case */
4952 btrfs_warn(fs_info
, "failed to start uuid_scan task");
4953 up(&fs_info
->uuid_tree_rescan_sem
);
4954 return PTR_ERR(task
);
4961 * shrinking a device means finding all of the device extents past
4962 * the new size, and then following the back refs to the chunks.
4963 * The chunk relocation code actually frees the device extent
4965 int btrfs_shrink_device(struct btrfs_device
*device
, u64 new_size
)
4967 struct btrfs_fs_info
*fs_info
= device
->fs_info
;
4968 struct btrfs_root
*root
= fs_info
->dev_root
;
4969 struct btrfs_trans_handle
*trans
;
4970 struct btrfs_dev_extent
*dev_extent
= NULL
;
4971 struct btrfs_path
*path
;
4977 bool retried
= false;
4978 struct extent_buffer
*l
;
4979 struct btrfs_key key
;
4980 struct btrfs_super_block
*super_copy
= fs_info
->super_copy
;
4981 u64 old_total
= btrfs_super_total_bytes(super_copy
);
4982 u64 old_size
= btrfs_device_get_total_bytes(device
);
4987 new_size
= round_down(new_size
, fs_info
->sectorsize
);
4989 diff
= round_down(old_size
- new_size
, fs_info
->sectorsize
);
4991 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT
, &device
->dev_state
))
4994 path
= btrfs_alloc_path();
4998 path
->reada
= READA_BACK
;
5000 trans
= btrfs_start_transaction(root
, 0);
5001 if (IS_ERR(trans
)) {
5002 btrfs_free_path(path
);
5003 return PTR_ERR(trans
);
5006 mutex_lock(&fs_info
->chunk_mutex
);
5008 btrfs_device_set_total_bytes(device
, new_size
);
5009 if (test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
)) {
5010 device
->fs_devices
->total_rw_bytes
-= diff
;
5013 * The new free_chunk_space is new_size - used, so we have to
5014 * subtract the delta of the old free_chunk_space which included
5015 * old_size - used. If used > new_size then just subtract this
5016 * entire device's free space.
5018 if (device
->bytes_used
< new_size
)
5019 free_diff
= (old_size
- device
->bytes_used
) -
5020 (new_size
- device
->bytes_used
);
5022 free_diff
= old_size
- device
->bytes_used
;
5023 atomic64_sub(free_diff
, &fs_info
->free_chunk_space
);
5027 * Once the device's size has been set to the new size, ensure all
5028 * in-memory chunks are synced to disk so that the loop below sees them
5029 * and relocates them accordingly.
5031 if (contains_pending_extent(device
, &start
, diff
)) {
5032 mutex_unlock(&fs_info
->chunk_mutex
);
5033 ret
= btrfs_commit_transaction(trans
);
5037 mutex_unlock(&fs_info
->chunk_mutex
);
5038 btrfs_end_transaction(trans
);
5042 key
.objectid
= device
->devid
;
5043 key
.offset
= (u64
)-1;
5044 key
.type
= BTRFS_DEV_EXTENT_KEY
;
5047 mutex_lock(&fs_info
->reclaim_bgs_lock
);
5048 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
5050 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
5054 ret
= btrfs_previous_item(root
, path
, 0, key
.type
);
5056 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
5060 btrfs_release_path(path
);
5065 slot
= path
->slots
[0];
5066 btrfs_item_key_to_cpu(l
, &key
, path
->slots
[0]);
5068 if (key
.objectid
!= device
->devid
) {
5069 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
5070 btrfs_release_path(path
);
5074 dev_extent
= btrfs_item_ptr(l
, slot
, struct btrfs_dev_extent
);
5075 length
= btrfs_dev_extent_length(l
, dev_extent
);
5077 if (key
.offset
+ length
<= new_size
) {
5078 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
5079 btrfs_release_path(path
);
5083 chunk_offset
= btrfs_dev_extent_chunk_offset(l
, dev_extent
);
5084 btrfs_release_path(path
);
5087 * We may be relocating the only data chunk we have,
5088 * which could potentially end up with losing data's
5089 * raid profile, so lets allocate an empty one in
5092 ret
= btrfs_may_alloc_data_chunk(fs_info
, chunk_offset
);
5094 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
5098 ret
= btrfs_relocate_chunk(fs_info
, chunk_offset
);
5099 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
5100 if (ret
== -ENOSPC
) {
5103 if (ret
== -ETXTBSY
) {
5105 "could not shrink block group %llu due to active swapfile",
5110 } while (key
.offset
-- > 0);
5112 if (failed
&& !retried
) {
5116 } else if (failed
&& retried
) {
5121 /* Shrinking succeeded, else we would be at "done". */
5122 trans
= btrfs_start_transaction(root
, 0);
5123 if (IS_ERR(trans
)) {
5124 ret
= PTR_ERR(trans
);
5128 mutex_lock(&fs_info
->chunk_mutex
);
5129 /* Clear all state bits beyond the shrunk device size */
5130 clear_extent_bits(&device
->alloc_state
, new_size
, (u64
)-1,
5133 btrfs_device_set_disk_total_bytes(device
, new_size
);
5134 if (list_empty(&device
->post_commit_list
))
5135 list_add_tail(&device
->post_commit_list
,
5136 &trans
->transaction
->dev_update_list
);
5138 WARN_ON(diff
> old_total
);
5139 btrfs_set_super_total_bytes(super_copy
,
5140 round_down(old_total
- diff
, fs_info
->sectorsize
));
5141 mutex_unlock(&fs_info
->chunk_mutex
);
5143 btrfs_reserve_chunk_metadata(trans
, false);
5144 /* Now btrfs_update_device() will change the on-disk size. */
5145 ret
= btrfs_update_device(trans
, device
);
5146 btrfs_trans_release_chunk_metadata(trans
);
5148 btrfs_abort_transaction(trans
, ret
);
5149 btrfs_end_transaction(trans
);
5151 ret
= btrfs_commit_transaction(trans
);
5154 btrfs_free_path(path
);
5156 mutex_lock(&fs_info
->chunk_mutex
);
5157 btrfs_device_set_total_bytes(device
, old_size
);
5158 if (test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
)) {
5159 device
->fs_devices
->total_rw_bytes
+= diff
;
5160 atomic64_add(free_diff
, &fs_info
->free_chunk_space
);
5162 mutex_unlock(&fs_info
->chunk_mutex
);
5167 static int btrfs_add_system_chunk(struct btrfs_fs_info
*fs_info
,
5168 struct btrfs_key
*key
,
5169 struct btrfs_chunk
*chunk
, int item_size
)
5171 struct btrfs_super_block
*super_copy
= fs_info
->super_copy
;
5172 struct btrfs_disk_key disk_key
;
5176 lockdep_assert_held(&fs_info
->chunk_mutex
);
5178 array_size
= btrfs_super_sys_array_size(super_copy
);
5179 if (array_size
+ item_size
+ sizeof(disk_key
)
5180 > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE
)
5183 ptr
= super_copy
->sys_chunk_array
+ array_size
;
5184 btrfs_cpu_key_to_disk(&disk_key
, key
);
5185 memcpy(ptr
, &disk_key
, sizeof(disk_key
));
5186 ptr
+= sizeof(disk_key
);
5187 memcpy(ptr
, chunk
, item_size
);
5188 item_size
+= sizeof(disk_key
);
5189 btrfs_set_super_sys_array_size(super_copy
, array_size
+ item_size
);
5195 * sort the devices in descending order by max_avail, total_avail
5197 static int btrfs_cmp_device_info(const void *a
, const void *b
)
5199 const struct btrfs_device_info
*di_a
= a
;
5200 const struct btrfs_device_info
*di_b
= b
;
5202 if (di_a
->max_avail
> di_b
->max_avail
)
5204 if (di_a
->max_avail
< di_b
->max_avail
)
5206 if (di_a
->total_avail
> di_b
->total_avail
)
5208 if (di_a
->total_avail
< di_b
->total_avail
)
5213 static void check_raid56_incompat_flag(struct btrfs_fs_info
*info
, u64 type
)
5215 if (!(type
& BTRFS_BLOCK_GROUP_RAID56_MASK
))
5218 btrfs_set_fs_incompat(info
, RAID56
);
5221 static void check_raid1c34_incompat_flag(struct btrfs_fs_info
*info
, u64 type
)
5223 if (!(type
& (BTRFS_BLOCK_GROUP_RAID1C3
| BTRFS_BLOCK_GROUP_RAID1C4
)))
5226 btrfs_set_fs_incompat(info
, RAID1C34
);
5230 * Structure used internally for btrfs_create_chunk() function.
5231 * Wraps needed parameters.
5233 struct alloc_chunk_ctl
{
5236 /* Total number of stripes to allocate */
5238 /* sub_stripes info for map */
5240 /* Stripes per device */
5242 /* Maximum number of devices to use */
5244 /* Minimum number of devices to use */
5246 /* ndevs has to be a multiple of this */
5248 /* Number of copies */
5250 /* Number of stripes worth of bytes to store parity information */
5252 u64 max_stripe_size
;
5260 static void init_alloc_chunk_ctl_policy_regular(
5261 struct btrfs_fs_devices
*fs_devices
,
5262 struct alloc_chunk_ctl
*ctl
)
5264 struct btrfs_space_info
*space_info
;
5266 space_info
= btrfs_find_space_info(fs_devices
->fs_info
, ctl
->type
);
5269 ctl
->max_chunk_size
= READ_ONCE(space_info
->chunk_size
);
5270 ctl
->max_stripe_size
= min_t(u64
, ctl
->max_chunk_size
, SZ_1G
);
5272 if (ctl
->type
& BTRFS_BLOCK_GROUP_SYSTEM
)
5273 ctl
->devs_max
= min_t(int, ctl
->devs_max
, BTRFS_MAX_DEVS_SYS_CHUNK
);
5275 /* We don't want a chunk larger than 10% of writable space */
5276 ctl
->max_chunk_size
= min(mult_perc(fs_devices
->total_rw_bytes
, 10),
5277 ctl
->max_chunk_size
);
5278 ctl
->dev_extent_min
= btrfs_stripe_nr_to_offset(ctl
->dev_stripes
);
5281 static void init_alloc_chunk_ctl_policy_zoned(
5282 struct btrfs_fs_devices
*fs_devices
,
5283 struct alloc_chunk_ctl
*ctl
)
5285 u64 zone_size
= fs_devices
->fs_info
->zone_size
;
5287 int min_num_stripes
= ctl
->devs_min
* ctl
->dev_stripes
;
5288 int min_data_stripes
= (min_num_stripes
- ctl
->nparity
) / ctl
->ncopies
;
5289 u64 min_chunk_size
= min_data_stripes
* zone_size
;
5290 u64 type
= ctl
->type
;
5292 ctl
->max_stripe_size
= zone_size
;
5293 if (type
& BTRFS_BLOCK_GROUP_DATA
) {
5294 ctl
->max_chunk_size
= round_down(BTRFS_MAX_DATA_CHUNK_SIZE
,
5296 } else if (type
& BTRFS_BLOCK_GROUP_METADATA
) {
5297 ctl
->max_chunk_size
= ctl
->max_stripe_size
;
5298 } else if (type
& BTRFS_BLOCK_GROUP_SYSTEM
) {
5299 ctl
->max_chunk_size
= 2 * ctl
->max_stripe_size
;
5300 ctl
->devs_max
= min_t(int, ctl
->devs_max
,
5301 BTRFS_MAX_DEVS_SYS_CHUNK
);
5306 /* We don't want a chunk larger than 10% of writable space */
5307 limit
= max(round_down(mult_perc(fs_devices
->total_rw_bytes
, 10),
5310 ctl
->max_chunk_size
= min(limit
, ctl
->max_chunk_size
);
5311 ctl
->dev_extent_min
= zone_size
* ctl
->dev_stripes
;
5314 static void init_alloc_chunk_ctl(struct btrfs_fs_devices
*fs_devices
,
5315 struct alloc_chunk_ctl
*ctl
)
5317 int index
= btrfs_bg_flags_to_raid_index(ctl
->type
);
5319 ctl
->sub_stripes
= btrfs_raid_array
[index
].sub_stripes
;
5320 ctl
->dev_stripes
= btrfs_raid_array
[index
].dev_stripes
;
5321 ctl
->devs_max
= btrfs_raid_array
[index
].devs_max
;
5323 ctl
->devs_max
= BTRFS_MAX_DEVS(fs_devices
->fs_info
);
5324 ctl
->devs_min
= btrfs_raid_array
[index
].devs_min
;
5325 ctl
->devs_increment
= btrfs_raid_array
[index
].devs_increment
;
5326 ctl
->ncopies
= btrfs_raid_array
[index
].ncopies
;
5327 ctl
->nparity
= btrfs_raid_array
[index
].nparity
;
5330 switch (fs_devices
->chunk_alloc_policy
) {
5331 case BTRFS_CHUNK_ALLOC_REGULAR
:
5332 init_alloc_chunk_ctl_policy_regular(fs_devices
, ctl
);
5334 case BTRFS_CHUNK_ALLOC_ZONED
:
5335 init_alloc_chunk_ctl_policy_zoned(fs_devices
, ctl
);
5342 static int gather_device_info(struct btrfs_fs_devices
*fs_devices
,
5343 struct alloc_chunk_ctl
*ctl
,
5344 struct btrfs_device_info
*devices_info
)
5346 struct btrfs_fs_info
*info
= fs_devices
->fs_info
;
5347 struct btrfs_device
*device
;
5349 u64 dev_extent_want
= ctl
->max_stripe_size
* ctl
->dev_stripes
;
5356 * in the first pass through the devices list, we gather information
5357 * about the available holes on each device.
5359 list_for_each_entry(device
, &fs_devices
->alloc_list
, dev_alloc_list
) {
5360 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
)) {
5362 "BTRFS: read-only device in alloc_list\n");
5366 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA
,
5367 &device
->dev_state
) ||
5368 test_bit(BTRFS_DEV_STATE_REPLACE_TGT
, &device
->dev_state
))
5371 if (device
->total_bytes
> device
->bytes_used
)
5372 total_avail
= device
->total_bytes
- device
->bytes_used
;
5376 /* If there is no space on this device, skip it. */
5377 if (total_avail
< ctl
->dev_extent_min
)
5380 ret
= find_free_dev_extent(device
, dev_extent_want
, &dev_offset
,
5382 if (ret
&& ret
!= -ENOSPC
)
5386 max_avail
= dev_extent_want
;
5388 if (max_avail
< ctl
->dev_extent_min
) {
5389 if (btrfs_test_opt(info
, ENOSPC_DEBUG
))
5391 "%s: devid %llu has no free space, have=%llu want=%llu",
5392 __func__
, device
->devid
, max_avail
,
5393 ctl
->dev_extent_min
);
5397 if (ndevs
== fs_devices
->rw_devices
) {
5398 WARN(1, "%s: found more than %llu devices\n",
5399 __func__
, fs_devices
->rw_devices
);
5402 devices_info
[ndevs
].dev_offset
= dev_offset
;
5403 devices_info
[ndevs
].max_avail
= max_avail
;
5404 devices_info
[ndevs
].total_avail
= total_avail
;
5405 devices_info
[ndevs
].dev
= device
;
5411 * now sort the devices by hole size / available space
5413 sort(devices_info
, ndevs
, sizeof(struct btrfs_device_info
),
5414 btrfs_cmp_device_info
, NULL
);
5419 static int decide_stripe_size_regular(struct alloc_chunk_ctl
*ctl
,
5420 struct btrfs_device_info
*devices_info
)
5422 /* Number of stripes that count for block group size */
5426 * The primary goal is to maximize the number of stripes, so use as
5427 * many devices as possible, even if the stripes are not maximum sized.
5429 * The DUP profile stores more than one stripe per device, the
5430 * max_avail is the total size so we have to adjust.
5432 ctl
->stripe_size
= div_u64(devices_info
[ctl
->ndevs
- 1].max_avail
,
5434 ctl
->num_stripes
= ctl
->ndevs
* ctl
->dev_stripes
;
5436 /* This will have to be fixed for RAID1 and RAID10 over more drives */
5437 data_stripes
= (ctl
->num_stripes
- ctl
->nparity
) / ctl
->ncopies
;
5440 * Use the number of data stripes to figure out how big this chunk is
5441 * really going to be in terms of logical address space, and compare
5442 * that answer with the max chunk size. If it's higher, we try to
5443 * reduce stripe_size.
5445 if (ctl
->stripe_size
* data_stripes
> ctl
->max_chunk_size
) {
5447 * Reduce stripe_size, round it up to a 16MB boundary again and
5448 * then use it, unless it ends up being even bigger than the
5449 * previous value we had already.
5451 ctl
->stripe_size
= min(round_up(div_u64(ctl
->max_chunk_size
,
5452 data_stripes
), SZ_16M
),
5456 /* Stripe size should not go beyond 1G. */
5457 ctl
->stripe_size
= min_t(u64
, ctl
->stripe_size
, SZ_1G
);
5459 /* Align to BTRFS_STRIPE_LEN */
5460 ctl
->stripe_size
= round_down(ctl
->stripe_size
, BTRFS_STRIPE_LEN
);
5461 ctl
->chunk_size
= ctl
->stripe_size
* data_stripes
;
5466 static int decide_stripe_size_zoned(struct alloc_chunk_ctl
*ctl
,
5467 struct btrfs_device_info
*devices_info
)
5469 u64 zone_size
= devices_info
[0].dev
->zone_info
->zone_size
;
5470 /* Number of stripes that count for block group size */
5474 * It should hold because:
5475 * dev_extent_min == dev_extent_want == zone_size * dev_stripes
5477 ASSERT(devices_info
[ctl
->ndevs
- 1].max_avail
== ctl
->dev_extent_min
);
5479 ctl
->stripe_size
= zone_size
;
5480 ctl
->num_stripes
= ctl
->ndevs
* ctl
->dev_stripes
;
5481 data_stripes
= (ctl
->num_stripes
- ctl
->nparity
) / ctl
->ncopies
;
5483 /* stripe_size is fixed in zoned filesysmte. Reduce ndevs instead. */
5484 if (ctl
->stripe_size
* data_stripes
> ctl
->max_chunk_size
) {
5485 ctl
->ndevs
= div_u64(div_u64(ctl
->max_chunk_size
* ctl
->ncopies
,
5486 ctl
->stripe_size
) + ctl
->nparity
,
5488 ctl
->num_stripes
= ctl
->ndevs
* ctl
->dev_stripes
;
5489 data_stripes
= (ctl
->num_stripes
- ctl
->nparity
) / ctl
->ncopies
;
5490 ASSERT(ctl
->stripe_size
* data_stripes
<= ctl
->max_chunk_size
);
5493 ctl
->chunk_size
= ctl
->stripe_size
* data_stripes
;
5498 static int decide_stripe_size(struct btrfs_fs_devices
*fs_devices
,
5499 struct alloc_chunk_ctl
*ctl
,
5500 struct btrfs_device_info
*devices_info
)
5502 struct btrfs_fs_info
*info
= fs_devices
->fs_info
;
5505 * Round down to number of usable stripes, devs_increment can be any
5506 * number so we can't use round_down() that requires power of 2, while
5507 * rounddown is safe.
5509 ctl
->ndevs
= rounddown(ctl
->ndevs
, ctl
->devs_increment
);
5511 if (ctl
->ndevs
< ctl
->devs_min
) {
5512 if (btrfs_test_opt(info
, ENOSPC_DEBUG
)) {
5514 "%s: not enough devices with free space: have=%d minimum required=%d",
5515 __func__
, ctl
->ndevs
, ctl
->devs_min
);
5520 ctl
->ndevs
= min(ctl
->ndevs
, ctl
->devs_max
);
5522 switch (fs_devices
->chunk_alloc_policy
) {
5523 case BTRFS_CHUNK_ALLOC_REGULAR
:
5524 return decide_stripe_size_regular(ctl
, devices_info
);
5525 case BTRFS_CHUNK_ALLOC_ZONED
:
5526 return decide_stripe_size_zoned(ctl
, devices_info
);
5532 static void chunk_map_device_set_bits(struct btrfs_chunk_map
*map
, unsigned int bits
)
5534 for (int i
= 0; i
< map
->num_stripes
; i
++) {
5535 struct btrfs_io_stripe
*stripe
= &map
->stripes
[i
];
5536 struct btrfs_device
*device
= stripe
->dev
;
5538 set_extent_bit(&device
->alloc_state
, stripe
->physical
,
5539 stripe
->physical
+ map
->stripe_size
- 1,
5540 bits
| EXTENT_NOWAIT
, NULL
);
5544 static void chunk_map_device_clear_bits(struct btrfs_chunk_map
*map
, unsigned int bits
)
5546 for (int i
= 0; i
< map
->num_stripes
; i
++) {
5547 struct btrfs_io_stripe
*stripe
= &map
->stripes
[i
];
5548 struct btrfs_device
*device
= stripe
->dev
;
5550 __clear_extent_bit(&device
->alloc_state
, stripe
->physical
,
5551 stripe
->physical
+ map
->stripe_size
- 1,
5552 bits
| EXTENT_NOWAIT
,
5557 void btrfs_remove_chunk_map(struct btrfs_fs_info
*fs_info
, struct btrfs_chunk_map
*map
)
5559 write_lock(&fs_info
->mapping_tree_lock
);
5560 rb_erase_cached(&map
->rb_node
, &fs_info
->mapping_tree
);
5561 RB_CLEAR_NODE(&map
->rb_node
);
5562 chunk_map_device_clear_bits(map
, CHUNK_ALLOCATED
);
5563 write_unlock(&fs_info
->mapping_tree_lock
);
5565 /* Once for the tree reference. */
5566 btrfs_free_chunk_map(map
);
5570 int btrfs_add_chunk_map(struct btrfs_fs_info
*fs_info
, struct btrfs_chunk_map
*map
)
5573 struct rb_node
*parent
= NULL
;
5574 bool leftmost
= true;
5576 write_lock(&fs_info
->mapping_tree_lock
);
5577 p
= &fs_info
->mapping_tree
.rb_root
.rb_node
;
5579 struct btrfs_chunk_map
*entry
;
5582 entry
= rb_entry(parent
, struct btrfs_chunk_map
, rb_node
);
5584 if (map
->start
< entry
->start
) {
5586 } else if (map
->start
> entry
->start
) {
5587 p
= &(*p
)->rb_right
;
5590 write_unlock(&fs_info
->mapping_tree_lock
);
5594 rb_link_node(&map
->rb_node
, parent
, p
);
5595 rb_insert_color_cached(&map
->rb_node
, &fs_info
->mapping_tree
, leftmost
);
5596 chunk_map_device_set_bits(map
, CHUNK_ALLOCATED
);
5597 chunk_map_device_clear_bits(map
, CHUNK_TRIMMED
);
5598 write_unlock(&fs_info
->mapping_tree_lock
);
5604 struct btrfs_chunk_map
*btrfs_alloc_chunk_map(int num_stripes
, gfp_t gfp
)
5606 struct btrfs_chunk_map
*map
;
5608 map
= kmalloc(btrfs_chunk_map_size(num_stripes
), gfp
);
5612 refcount_set(&map
->refs
, 1);
5613 RB_CLEAR_NODE(&map
->rb_node
);
5618 static struct btrfs_block_group
*create_chunk(struct btrfs_trans_handle
*trans
,
5619 struct alloc_chunk_ctl
*ctl
,
5620 struct btrfs_device_info
*devices_info
)
5622 struct btrfs_fs_info
*info
= trans
->fs_info
;
5623 struct btrfs_chunk_map
*map
;
5624 struct btrfs_block_group
*block_group
;
5625 u64 start
= ctl
->start
;
5626 u64 type
= ctl
->type
;
5631 map
= btrfs_alloc_chunk_map(ctl
->num_stripes
, GFP_NOFS
);
5633 return ERR_PTR(-ENOMEM
);
5636 map
->chunk_len
= ctl
->chunk_size
;
5637 map
->stripe_size
= ctl
->stripe_size
;
5639 map
->io_align
= BTRFS_STRIPE_LEN
;
5640 map
->io_width
= BTRFS_STRIPE_LEN
;
5641 map
->sub_stripes
= ctl
->sub_stripes
;
5642 map
->num_stripes
= ctl
->num_stripes
;
5644 for (i
= 0; i
< ctl
->ndevs
; ++i
) {
5645 for (j
= 0; j
< ctl
->dev_stripes
; ++j
) {
5646 int s
= i
* ctl
->dev_stripes
+ j
;
5647 map
->stripes
[s
].dev
= devices_info
[i
].dev
;
5648 map
->stripes
[s
].physical
= devices_info
[i
].dev_offset
+
5649 j
* ctl
->stripe_size
;
5653 trace_btrfs_chunk_alloc(info
, map
, start
, ctl
->chunk_size
);
5655 ret
= btrfs_add_chunk_map(info
, map
);
5657 btrfs_free_chunk_map(map
);
5658 return ERR_PTR(ret
);
5661 block_group
= btrfs_make_block_group(trans
, type
, start
, ctl
->chunk_size
);
5662 if (IS_ERR(block_group
)) {
5663 btrfs_remove_chunk_map(info
, map
);
5667 for (int i
= 0; i
< map
->num_stripes
; i
++) {
5668 struct btrfs_device
*dev
= map
->stripes
[i
].dev
;
5670 btrfs_device_set_bytes_used(dev
,
5671 dev
->bytes_used
+ ctl
->stripe_size
);
5672 if (list_empty(&dev
->post_commit_list
))
5673 list_add_tail(&dev
->post_commit_list
,
5674 &trans
->transaction
->dev_update_list
);
5677 atomic64_sub(ctl
->stripe_size
* map
->num_stripes
,
5678 &info
->free_chunk_space
);
5680 check_raid56_incompat_flag(info
, type
);
5681 check_raid1c34_incompat_flag(info
, type
);
5686 struct btrfs_block_group
*btrfs_create_chunk(struct btrfs_trans_handle
*trans
,
5689 struct btrfs_fs_info
*info
= trans
->fs_info
;
5690 struct btrfs_fs_devices
*fs_devices
= info
->fs_devices
;
5691 struct btrfs_device_info
*devices_info
= NULL
;
5692 struct alloc_chunk_ctl ctl
;
5693 struct btrfs_block_group
*block_group
;
5696 lockdep_assert_held(&info
->chunk_mutex
);
5698 if (!alloc_profile_is_valid(type
, 0)) {
5700 return ERR_PTR(-EINVAL
);
5703 if (list_empty(&fs_devices
->alloc_list
)) {
5704 if (btrfs_test_opt(info
, ENOSPC_DEBUG
))
5705 btrfs_debug(info
, "%s: no writable device", __func__
);
5706 return ERR_PTR(-ENOSPC
);
5709 if (!(type
& BTRFS_BLOCK_GROUP_TYPE_MASK
)) {
5710 btrfs_err(info
, "invalid chunk type 0x%llx requested", type
);
5712 return ERR_PTR(-EINVAL
);
5715 ctl
.start
= find_next_chunk(info
);
5717 init_alloc_chunk_ctl(fs_devices
, &ctl
);
5719 devices_info
= kcalloc(fs_devices
->rw_devices
, sizeof(*devices_info
),
5722 return ERR_PTR(-ENOMEM
);
5724 ret
= gather_device_info(fs_devices
, &ctl
, devices_info
);
5726 block_group
= ERR_PTR(ret
);
5730 ret
= decide_stripe_size(fs_devices
, &ctl
, devices_info
);
5732 block_group
= ERR_PTR(ret
);
5736 block_group
= create_chunk(trans
, &ctl
, devices_info
);
5739 kfree(devices_info
);
5744 * This function, btrfs_chunk_alloc_add_chunk_item(), typically belongs to the
5745 * phase 1 of chunk allocation. It belongs to phase 2 only when allocating system
5748 * See the comment at btrfs_chunk_alloc() for details about the chunk allocation
5751 int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle
*trans
,
5752 struct btrfs_block_group
*bg
)
5754 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
5755 struct btrfs_root
*chunk_root
= fs_info
->chunk_root
;
5756 struct btrfs_key key
;
5757 struct btrfs_chunk
*chunk
;
5758 struct btrfs_stripe
*stripe
;
5759 struct btrfs_chunk_map
*map
;
5765 * We take the chunk_mutex for 2 reasons:
5767 * 1) Updates and insertions in the chunk btree must be done while holding
5768 * the chunk_mutex, as well as updating the system chunk array in the
5769 * superblock. See the comment on top of btrfs_chunk_alloc() for the
5772 * 2) To prevent races with the final phase of a device replace operation
5773 * that replaces the device object associated with the map's stripes,
5774 * because the device object's id can change at any time during that
5775 * final phase of the device replace operation
5776 * (dev-replace.c:btrfs_dev_replace_finishing()), so we could grab the
5777 * replaced device and then see it with an ID of BTRFS_DEV_REPLACE_DEVID,
5778 * which would cause a failure when updating the device item, which does
5779 * not exists, or persisting a stripe of the chunk item with such ID.
5780 * Here we can't use the device_list_mutex because our caller already
5781 * has locked the chunk_mutex, and the final phase of device replace
5782 * acquires both mutexes - first the device_list_mutex and then the
5783 * chunk_mutex. Using any of those two mutexes protects us from a
5784 * concurrent device replace.
5786 lockdep_assert_held(&fs_info
->chunk_mutex
);
5788 map
= btrfs_get_chunk_map(fs_info
, bg
->start
, bg
->length
);
5791 btrfs_abort_transaction(trans
, ret
);
5795 item_size
= btrfs_chunk_item_size(map
->num_stripes
);
5797 chunk
= kzalloc(item_size
, GFP_NOFS
);
5800 btrfs_abort_transaction(trans
, ret
);
5804 for (i
= 0; i
< map
->num_stripes
; i
++) {
5805 struct btrfs_device
*device
= map
->stripes
[i
].dev
;
5807 ret
= btrfs_update_device(trans
, device
);
5812 stripe
= &chunk
->stripe
;
5813 for (i
= 0; i
< map
->num_stripes
; i
++) {
5814 struct btrfs_device
*device
= map
->stripes
[i
].dev
;
5815 const u64 dev_offset
= map
->stripes
[i
].physical
;
5817 btrfs_set_stack_stripe_devid(stripe
, device
->devid
);
5818 btrfs_set_stack_stripe_offset(stripe
, dev_offset
);
5819 memcpy(stripe
->dev_uuid
, device
->uuid
, BTRFS_UUID_SIZE
);
5823 btrfs_set_stack_chunk_length(chunk
, bg
->length
);
5824 btrfs_set_stack_chunk_owner(chunk
, BTRFS_EXTENT_TREE_OBJECTID
);
5825 btrfs_set_stack_chunk_stripe_len(chunk
, BTRFS_STRIPE_LEN
);
5826 btrfs_set_stack_chunk_type(chunk
, map
->type
);
5827 btrfs_set_stack_chunk_num_stripes(chunk
, map
->num_stripes
);
5828 btrfs_set_stack_chunk_io_align(chunk
, BTRFS_STRIPE_LEN
);
5829 btrfs_set_stack_chunk_io_width(chunk
, BTRFS_STRIPE_LEN
);
5830 btrfs_set_stack_chunk_sector_size(chunk
, fs_info
->sectorsize
);
5831 btrfs_set_stack_chunk_sub_stripes(chunk
, map
->sub_stripes
);
5833 key
.objectid
= BTRFS_FIRST_CHUNK_TREE_OBJECTID
;
5834 key
.type
= BTRFS_CHUNK_ITEM_KEY
;
5835 key
.offset
= bg
->start
;
5837 ret
= btrfs_insert_item(trans
, chunk_root
, &key
, chunk
, item_size
);
5841 set_bit(BLOCK_GROUP_FLAG_CHUNK_ITEM_INSERTED
, &bg
->runtime_flags
);
5843 if (map
->type
& BTRFS_BLOCK_GROUP_SYSTEM
) {
5844 ret
= btrfs_add_system_chunk(fs_info
, &key
, chunk
, item_size
);
5851 btrfs_free_chunk_map(map
);
5855 static noinline
int init_first_rw_device(struct btrfs_trans_handle
*trans
)
5857 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
5859 struct btrfs_block_group
*meta_bg
;
5860 struct btrfs_block_group
*sys_bg
;
5863 * When adding a new device for sprouting, the seed device is read-only
5864 * so we must first allocate a metadata and a system chunk. But before
5865 * adding the block group items to the extent, device and chunk btrees,
5868 * 1) Create both chunks without doing any changes to the btrees, as
5869 * otherwise we would get -ENOSPC since the block groups from the
5870 * seed device are read-only;
5872 * 2) Add the device item for the new sprout device - finishing the setup
5873 * of a new block group requires updating the device item in the chunk
5874 * btree, so it must exist when we attempt to do it. The previous step
5875 * ensures this does not fail with -ENOSPC.
5877 * After that we can add the block group items to their btrees:
5878 * update existing device item in the chunk btree, add a new block group
5879 * item to the extent btree, add a new chunk item to the chunk btree and
5880 * finally add the new device extent items to the devices btree.
5883 alloc_profile
= btrfs_metadata_alloc_profile(fs_info
);
5884 meta_bg
= btrfs_create_chunk(trans
, alloc_profile
);
5885 if (IS_ERR(meta_bg
))
5886 return PTR_ERR(meta_bg
);
5888 alloc_profile
= btrfs_system_alloc_profile(fs_info
);
5889 sys_bg
= btrfs_create_chunk(trans
, alloc_profile
);
5891 return PTR_ERR(sys_bg
);
5896 static inline int btrfs_chunk_max_errors(struct btrfs_chunk_map
*map
)
5898 const int index
= btrfs_bg_flags_to_raid_index(map
->type
);
5900 return btrfs_raid_array
[index
].tolerated_failures
;
5903 bool btrfs_chunk_writeable(struct btrfs_fs_info
*fs_info
, u64 chunk_offset
)
5905 struct btrfs_chunk_map
*map
;
5910 map
= btrfs_get_chunk_map(fs_info
, chunk_offset
, 1);
5914 for (i
= 0; i
< map
->num_stripes
; i
++) {
5915 if (test_bit(BTRFS_DEV_STATE_MISSING
,
5916 &map
->stripes
[i
].dev
->dev_state
)) {
5920 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE
,
5921 &map
->stripes
[i
].dev
->dev_state
)) {
5928 * If the number of missing devices is larger than max errors, we can
5929 * not write the data into that chunk successfully.
5931 if (miss_ndevs
> btrfs_chunk_max_errors(map
))
5934 btrfs_free_chunk_map(map
);
5938 void btrfs_mapping_tree_free(struct btrfs_fs_info
*fs_info
)
5940 write_lock(&fs_info
->mapping_tree_lock
);
5941 while (!RB_EMPTY_ROOT(&fs_info
->mapping_tree
.rb_root
)) {
5942 struct btrfs_chunk_map
*map
;
5943 struct rb_node
*node
;
5945 node
= rb_first_cached(&fs_info
->mapping_tree
);
5946 map
= rb_entry(node
, struct btrfs_chunk_map
, rb_node
);
5947 rb_erase_cached(&map
->rb_node
, &fs_info
->mapping_tree
);
5948 RB_CLEAR_NODE(&map
->rb_node
);
5949 chunk_map_device_clear_bits(map
, CHUNK_ALLOCATED
);
5950 /* Once for the tree ref. */
5951 btrfs_free_chunk_map(map
);
5952 cond_resched_rwlock_write(&fs_info
->mapping_tree_lock
);
5954 write_unlock(&fs_info
->mapping_tree_lock
);
5957 int btrfs_num_copies(struct btrfs_fs_info
*fs_info
, u64 logical
, u64 len
)
5959 struct btrfs_chunk_map
*map
;
5960 enum btrfs_raid_types index
;
5963 map
= btrfs_get_chunk_map(fs_info
, logical
, len
);
5966 * We could return errors for these cases, but that could get
5967 * ugly and we'd probably do the same thing which is just not do
5968 * anything else and exit, so return 1 so the callers don't try
5969 * to use other copies.
5973 index
= btrfs_bg_flags_to_raid_index(map
->type
);
5975 /* Non-RAID56, use their ncopies from btrfs_raid_array. */
5976 if (!(map
->type
& BTRFS_BLOCK_GROUP_RAID56_MASK
))
5977 ret
= btrfs_raid_array
[index
].ncopies
;
5978 else if (map
->type
& BTRFS_BLOCK_GROUP_RAID5
)
5980 else if (map
->type
& BTRFS_BLOCK_GROUP_RAID6
)
5982 * There could be two corrupted data stripes, we need
5983 * to loop retry in order to rebuild the correct data.
5985 * Fail a stripe at a time on every retry except the
5986 * stripe under reconstruction.
5988 ret
= map
->num_stripes
;
5989 btrfs_free_chunk_map(map
);
5993 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info
*fs_info
,
5996 struct btrfs_chunk_map
*map
;
5997 unsigned long len
= fs_info
->sectorsize
;
5999 if (!btrfs_fs_incompat(fs_info
, RAID56
))
6002 map
= btrfs_get_chunk_map(fs_info
, logical
, len
);
6004 if (!WARN_ON(IS_ERR(map
))) {
6005 if (map
->type
& BTRFS_BLOCK_GROUP_RAID56_MASK
)
6006 len
= btrfs_stripe_nr_to_offset(nr_data_stripes(map
));
6007 btrfs_free_chunk_map(map
);
6012 int btrfs_is_parity_mirror(struct btrfs_fs_info
*fs_info
, u64 logical
, u64 len
)
6014 struct btrfs_chunk_map
*map
;
6017 if (!btrfs_fs_incompat(fs_info
, RAID56
))
6020 map
= btrfs_get_chunk_map(fs_info
, logical
, len
);
6022 if (!WARN_ON(IS_ERR(map
))) {
6023 if (map
->type
& BTRFS_BLOCK_GROUP_RAID56_MASK
)
6025 btrfs_free_chunk_map(map
);
6030 static int find_live_mirror(struct btrfs_fs_info
*fs_info
,
6031 struct btrfs_chunk_map
*map
, int first
,
6032 int dev_replace_is_ongoing
)
6034 const enum btrfs_read_policy policy
= READ_ONCE(fs_info
->fs_devices
->read_policy
);
6037 int preferred_mirror
;
6039 struct btrfs_device
*srcdev
;
6042 (BTRFS_BLOCK_GROUP_RAID1_MASK
| BTRFS_BLOCK_GROUP_RAID10
)));
6044 if (map
->type
& BTRFS_BLOCK_GROUP_RAID10
)
6045 num_stripes
= map
->sub_stripes
;
6047 num_stripes
= map
->num_stripes
;
6051 /* Shouldn't happen, just warn and use pid instead of failing */
6052 btrfs_warn_rl(fs_info
, "unknown read_policy type %u, reset to pid",
6054 WRITE_ONCE(fs_info
->fs_devices
->read_policy
, BTRFS_READ_POLICY_PID
);
6056 case BTRFS_READ_POLICY_PID
:
6057 preferred_mirror
= first
+ (current
->pid
% num_stripes
);
6061 if (dev_replace_is_ongoing
&&
6062 fs_info
->dev_replace
.cont_reading_from_srcdev_mode
==
6063 BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID
)
6064 srcdev
= fs_info
->dev_replace
.srcdev
;
6069 * try to avoid the drive that is the source drive for a
6070 * dev-replace procedure, only choose it if no other non-missing
6071 * mirror is available
6073 for (tolerance
= 0; tolerance
< 2; tolerance
++) {
6074 if (map
->stripes
[preferred_mirror
].dev
->bdev
&&
6075 (tolerance
|| map
->stripes
[preferred_mirror
].dev
!= srcdev
))
6076 return preferred_mirror
;
6077 for (i
= first
; i
< first
+ num_stripes
; i
++) {
6078 if (map
->stripes
[i
].dev
->bdev
&&
6079 (tolerance
|| map
->stripes
[i
].dev
!= srcdev
))
6084 /* we couldn't find one that doesn't fail. Just return something
6085 * and the io error handling code will clean up eventually
6087 return preferred_mirror
;
6090 static struct btrfs_io_context
*alloc_btrfs_io_context(struct btrfs_fs_info
*fs_info
,
6094 struct btrfs_io_context
*bioc
;
6097 /* The size of btrfs_io_context */
6098 sizeof(struct btrfs_io_context
) +
6099 /* Plus the variable array for the stripes */
6100 sizeof(struct btrfs_io_stripe
) * (total_stripes
),
6106 refcount_set(&bioc
->refs
, 1);
6108 bioc
->fs_info
= fs_info
;
6109 bioc
->replace_stripe_src
= -1;
6110 bioc
->full_stripe_logical
= (u64
)-1;
6111 bioc
->logical
= logical
;
6116 void btrfs_get_bioc(struct btrfs_io_context
*bioc
)
6118 WARN_ON(!refcount_read(&bioc
->refs
));
6119 refcount_inc(&bioc
->refs
);
6122 void btrfs_put_bioc(struct btrfs_io_context
*bioc
)
6126 if (refcount_dec_and_test(&bioc
->refs
))
6131 * Please note that, discard won't be sent to target device of device
6134 struct btrfs_discard_stripe
*btrfs_map_discard(struct btrfs_fs_info
*fs_info
,
6135 u64 logical
, u64
*length_ret
,
6138 struct btrfs_chunk_map
*map
;
6139 struct btrfs_discard_stripe
*stripes
;
6140 u64 length
= *length_ret
;
6145 u64 stripe_end_offset
;
6149 u32 sub_stripes
= 0;
6150 u32 stripes_per_dev
= 0;
6151 u32 remaining_stripes
= 0;
6152 u32 last_stripe
= 0;
6156 map
= btrfs_get_chunk_map(fs_info
, logical
, length
);
6158 return ERR_CAST(map
);
6160 /* we don't discard raid56 yet */
6161 if (map
->type
& BTRFS_BLOCK_GROUP_RAID56_MASK
) {
6166 offset
= logical
- map
->start
;
6167 length
= min_t(u64
, map
->start
+ map
->chunk_len
- logical
, length
);
6168 *length_ret
= length
;
6171 * stripe_nr counts the total number of stripes we have to stride
6172 * to get to this block
6174 stripe_nr
= offset
>> BTRFS_STRIPE_LEN_SHIFT
;
6176 /* stripe_offset is the offset of this block in its stripe */
6177 stripe_offset
= offset
- btrfs_stripe_nr_to_offset(stripe_nr
);
6179 stripe_nr_end
= round_up(offset
+ length
, BTRFS_STRIPE_LEN
) >>
6180 BTRFS_STRIPE_LEN_SHIFT
;
6181 stripe_cnt
= stripe_nr_end
- stripe_nr
;
6182 stripe_end_offset
= btrfs_stripe_nr_to_offset(stripe_nr_end
) -
6185 * after this, stripe_nr is the number of stripes on this
6186 * device we have to walk to find the data, and stripe_index is
6187 * the number of our device in the stripe array
6191 if (map
->type
& (BTRFS_BLOCK_GROUP_RAID0
|
6192 BTRFS_BLOCK_GROUP_RAID10
)) {
6193 if (map
->type
& BTRFS_BLOCK_GROUP_RAID0
)
6196 sub_stripes
= map
->sub_stripes
;
6198 factor
= map
->num_stripes
/ sub_stripes
;
6199 *num_stripes
= min_t(u64
, map
->num_stripes
,
6200 sub_stripes
* stripe_cnt
);
6201 stripe_index
= stripe_nr
% factor
;
6202 stripe_nr
/= factor
;
6203 stripe_index
*= sub_stripes
;
6205 remaining_stripes
= stripe_cnt
% factor
;
6206 stripes_per_dev
= stripe_cnt
/ factor
;
6207 last_stripe
= ((stripe_nr_end
- 1) % factor
) * sub_stripes
;
6208 } else if (map
->type
& (BTRFS_BLOCK_GROUP_RAID1_MASK
|
6209 BTRFS_BLOCK_GROUP_DUP
)) {
6210 *num_stripes
= map
->num_stripes
;
6212 stripe_index
= stripe_nr
% map
->num_stripes
;
6213 stripe_nr
/= map
->num_stripes
;
6216 stripes
= kcalloc(*num_stripes
, sizeof(*stripes
), GFP_NOFS
);
6222 for (i
= 0; i
< *num_stripes
; i
++) {
6223 stripes
[i
].physical
=
6224 map
->stripes
[stripe_index
].physical
+
6225 stripe_offset
+ btrfs_stripe_nr_to_offset(stripe_nr
);
6226 stripes
[i
].dev
= map
->stripes
[stripe_index
].dev
;
6228 if (map
->type
& (BTRFS_BLOCK_GROUP_RAID0
|
6229 BTRFS_BLOCK_GROUP_RAID10
)) {
6230 stripes
[i
].length
= btrfs_stripe_nr_to_offset(stripes_per_dev
);
6232 if (i
/ sub_stripes
< remaining_stripes
)
6233 stripes
[i
].length
+= BTRFS_STRIPE_LEN
;
6236 * Special for the first stripe and
6239 * |-------|...|-------|
6243 if (i
< sub_stripes
)
6244 stripes
[i
].length
-= stripe_offset
;
6246 if (stripe_index
>= last_stripe
&&
6247 stripe_index
<= (last_stripe
+
6249 stripes
[i
].length
-= stripe_end_offset
;
6251 if (i
== sub_stripes
- 1)
6254 stripes
[i
].length
= length
;
6258 if (stripe_index
== map
->num_stripes
) {
6264 btrfs_free_chunk_map(map
);
6267 btrfs_free_chunk_map(map
);
6268 return ERR_PTR(ret
);
6271 static bool is_block_group_to_copy(struct btrfs_fs_info
*fs_info
, u64 logical
)
6273 struct btrfs_block_group
*cache
;
6276 /* Non zoned filesystem does not use "to_copy" flag */
6277 if (!btrfs_is_zoned(fs_info
))
6280 cache
= btrfs_lookup_block_group(fs_info
, logical
);
6282 ret
= test_bit(BLOCK_GROUP_FLAG_TO_COPY
, &cache
->runtime_flags
);
6284 btrfs_put_block_group(cache
);
6288 static void handle_ops_on_dev_replace(enum btrfs_map_op op
,
6289 struct btrfs_io_context
*bioc
,
6290 struct btrfs_dev_replace
*dev_replace
,
6292 int *num_stripes_ret
, int *max_errors_ret
)
6294 u64 srcdev_devid
= dev_replace
->srcdev
->devid
;
6296 * At this stage, num_stripes is still the real number of stripes,
6297 * excluding the duplicated stripes.
6299 int num_stripes
= *num_stripes_ret
;
6300 int nr_extra_stripes
= 0;
6301 int max_errors
= *max_errors_ret
;
6305 * A block group which has "to_copy" set will eventually be copied by
6306 * the dev-replace process. We can avoid cloning IO here.
6308 if (is_block_group_to_copy(dev_replace
->srcdev
->fs_info
, logical
))
6312 * Duplicate the write operations while the dev-replace procedure is
6313 * running. Since the copying of the old disk to the new disk takes
6314 * place at run time while the filesystem is mounted writable, the
6315 * regular write operations to the old disk have to be duplicated to go
6316 * to the new disk as well.
6318 * Note that device->missing is handled by the caller, and that the
6319 * write to the old disk is already set up in the stripes array.
6321 for (i
= 0; i
< num_stripes
; i
++) {
6322 struct btrfs_io_stripe
*old
= &bioc
->stripes
[i
];
6323 struct btrfs_io_stripe
*new = &bioc
->stripes
[num_stripes
+ nr_extra_stripes
];
6325 if (old
->dev
->devid
!= srcdev_devid
)
6328 new->physical
= old
->physical
;
6329 new->dev
= dev_replace
->tgtdev
;
6330 if (bioc
->map_type
& BTRFS_BLOCK_GROUP_RAID56_MASK
)
6331 bioc
->replace_stripe_src
= i
;
6335 /* We can only have at most 2 extra nr_stripes (for DUP). */
6336 ASSERT(nr_extra_stripes
<= 2);
6338 * For GET_READ_MIRRORS, we can only return at most 1 extra stripe for
6340 * If we have 2 extra stripes, only choose the one with smaller physical.
6342 if (op
== BTRFS_MAP_GET_READ_MIRRORS
&& nr_extra_stripes
== 2) {
6343 struct btrfs_io_stripe
*first
= &bioc
->stripes
[num_stripes
];
6344 struct btrfs_io_stripe
*second
= &bioc
->stripes
[num_stripes
+ 1];
6346 /* Only DUP can have two extra stripes. */
6347 ASSERT(bioc
->map_type
& BTRFS_BLOCK_GROUP_DUP
);
6350 * Swap the last stripe stripes and reduce @nr_extra_stripes.
6351 * The extra stripe would still be there, but won't be accessed.
6353 if (first
->physical
> second
->physical
) {
6354 swap(second
->physical
, first
->physical
);
6355 swap(second
->dev
, first
->dev
);
6360 *num_stripes_ret
= num_stripes
+ nr_extra_stripes
;
6361 *max_errors_ret
= max_errors
+ nr_extra_stripes
;
6362 bioc
->replace_nr_stripes
= nr_extra_stripes
;
6365 static u64
btrfs_max_io_len(struct btrfs_chunk_map
*map
, u64 offset
,
6366 struct btrfs_io_geometry
*io_geom
)
6369 * Stripe_nr is the stripe where this block falls. stripe_offset is
6370 * the offset of this block in its stripe.
6372 io_geom
->stripe_offset
= offset
& BTRFS_STRIPE_LEN_MASK
;
6373 io_geom
->stripe_nr
= offset
>> BTRFS_STRIPE_LEN_SHIFT
;
6374 ASSERT(io_geom
->stripe_offset
< U32_MAX
);
6376 if (map
->type
& BTRFS_BLOCK_GROUP_RAID56_MASK
) {
6377 unsigned long full_stripe_len
=
6378 btrfs_stripe_nr_to_offset(nr_data_stripes(map
));
6381 * For full stripe start, we use previously calculated
6382 * @stripe_nr. Align it to nr_data_stripes, then multiply with
6385 * By this we can avoid u64 division completely. And we have
6386 * to go rounddown(), not round_down(), as nr_data_stripes is
6387 * not ensured to be power of 2.
6389 io_geom
->raid56_full_stripe_start
= btrfs_stripe_nr_to_offset(
6390 rounddown(io_geom
->stripe_nr
, nr_data_stripes(map
)));
6392 ASSERT(io_geom
->raid56_full_stripe_start
+ full_stripe_len
> offset
);
6393 ASSERT(io_geom
->raid56_full_stripe_start
<= offset
);
6395 * For writes to RAID56, allow to write a full stripe set, but
6396 * no straddling of stripe sets.
6398 if (io_geom
->op
== BTRFS_MAP_WRITE
)
6399 return full_stripe_len
- (offset
- io_geom
->raid56_full_stripe_start
);
6403 * For other RAID types and for RAID56 reads, allow a single stripe (on
6406 if (map
->type
& BTRFS_BLOCK_GROUP_STRIPE_MASK
)
6407 return BTRFS_STRIPE_LEN
- io_geom
->stripe_offset
;
6411 static int set_io_stripe(struct btrfs_fs_info
*fs_info
, u64 logical
,
6412 u64
*length
, struct btrfs_io_stripe
*dst
,
6413 struct btrfs_chunk_map
*map
,
6414 struct btrfs_io_geometry
*io_geom
)
6416 dst
->dev
= map
->stripes
[io_geom
->stripe_index
].dev
;
6418 if (io_geom
->op
== BTRFS_MAP_READ
&&
6419 btrfs_need_stripe_tree_update(fs_info
, map
->type
))
6420 return btrfs_get_raid_extent_offset(fs_info
, logical
, length
,
6422 io_geom
->stripe_index
, dst
);
6424 dst
->physical
= map
->stripes
[io_geom
->stripe_index
].physical
+
6425 io_geom
->stripe_offset
+
6426 btrfs_stripe_nr_to_offset(io_geom
->stripe_nr
);
6430 static bool is_single_device_io(struct btrfs_fs_info
*fs_info
,
6431 const struct btrfs_io_stripe
*smap
,
6432 const struct btrfs_chunk_map
*map
,
6433 int num_alloc_stripes
,
6434 enum btrfs_map_op op
, int mirror_num
)
6439 if (num_alloc_stripes
!= 1)
6442 if (btrfs_need_stripe_tree_update(fs_info
, map
->type
) && op
!= BTRFS_MAP_READ
)
6445 if ((map
->type
& BTRFS_BLOCK_GROUP_RAID56_MASK
) && mirror_num
> 1)
6451 static void map_blocks_raid0(const struct btrfs_chunk_map
*map
,
6452 struct btrfs_io_geometry
*io_geom
)
6454 io_geom
->stripe_index
= io_geom
->stripe_nr
% map
->num_stripes
;
6455 io_geom
->stripe_nr
/= map
->num_stripes
;
6456 if (io_geom
->op
== BTRFS_MAP_READ
)
6457 io_geom
->mirror_num
= 1;
6460 static void map_blocks_raid1(struct btrfs_fs_info
*fs_info
,
6461 struct btrfs_chunk_map
*map
,
6462 struct btrfs_io_geometry
*io_geom
,
6463 bool dev_replace_is_ongoing
)
6465 if (io_geom
->op
!= BTRFS_MAP_READ
) {
6466 io_geom
->num_stripes
= map
->num_stripes
;
6470 if (io_geom
->mirror_num
) {
6471 io_geom
->stripe_index
= io_geom
->mirror_num
- 1;
6475 io_geom
->stripe_index
= find_live_mirror(fs_info
, map
, 0,
6476 dev_replace_is_ongoing
);
6477 io_geom
->mirror_num
= io_geom
->stripe_index
+ 1;
6480 static void map_blocks_dup(const struct btrfs_chunk_map
*map
,
6481 struct btrfs_io_geometry
*io_geom
)
6483 if (io_geom
->op
!= BTRFS_MAP_READ
) {
6484 io_geom
->num_stripes
= map
->num_stripes
;
6488 if (io_geom
->mirror_num
) {
6489 io_geom
->stripe_index
= io_geom
->mirror_num
- 1;
6493 io_geom
->mirror_num
= 1;
6496 static void map_blocks_raid10(struct btrfs_fs_info
*fs_info
,
6497 struct btrfs_chunk_map
*map
,
6498 struct btrfs_io_geometry
*io_geom
,
6499 bool dev_replace_is_ongoing
)
6501 u32 factor
= map
->num_stripes
/ map
->sub_stripes
;
6502 int old_stripe_index
;
6504 io_geom
->stripe_index
= (io_geom
->stripe_nr
% factor
) * map
->sub_stripes
;
6505 io_geom
->stripe_nr
/= factor
;
6507 if (io_geom
->op
!= BTRFS_MAP_READ
) {
6508 io_geom
->num_stripes
= map
->sub_stripes
;
6512 if (io_geom
->mirror_num
) {
6513 io_geom
->stripe_index
+= io_geom
->mirror_num
- 1;
6517 old_stripe_index
= io_geom
->stripe_index
;
6518 io_geom
->stripe_index
= find_live_mirror(fs_info
, map
,
6519 io_geom
->stripe_index
,
6520 dev_replace_is_ongoing
);
6521 io_geom
->mirror_num
= io_geom
->stripe_index
- old_stripe_index
+ 1;
6524 static void map_blocks_raid56_write(struct btrfs_chunk_map
*map
,
6525 struct btrfs_io_geometry
*io_geom
,
6526 u64 logical
, u64
*length
)
6528 int data_stripes
= nr_data_stripes(map
);
6531 * Needs full stripe mapping.
6533 * Push stripe_nr back to the start of the full stripe For those cases
6534 * needing a full stripe, @stripe_nr is the full stripe number.
6536 * Originally we go raid56_full_stripe_start / full_stripe_len, but
6537 * that can be expensive. Here we just divide @stripe_nr with
6540 io_geom
->stripe_nr
/= data_stripes
;
6542 /* RAID[56] write or recovery. Return all stripes */
6543 io_geom
->num_stripes
= map
->num_stripes
;
6544 io_geom
->max_errors
= btrfs_chunk_max_errors(map
);
6546 /* Return the length to the full stripe end. */
6547 *length
= min(logical
+ *length
,
6548 io_geom
->raid56_full_stripe_start
+ map
->start
+
6549 btrfs_stripe_nr_to_offset(data_stripes
)) -
6551 io_geom
->stripe_index
= 0;
6552 io_geom
->stripe_offset
= 0;
6555 static void map_blocks_raid56_read(struct btrfs_chunk_map
*map
,
6556 struct btrfs_io_geometry
*io_geom
)
6558 int data_stripes
= nr_data_stripes(map
);
6560 ASSERT(io_geom
->mirror_num
<= 1);
6561 /* Just grab the data stripe directly. */
6562 io_geom
->stripe_index
= io_geom
->stripe_nr
% data_stripes
;
6563 io_geom
->stripe_nr
/= data_stripes
;
6565 /* We distribute the parity blocks across stripes. */
6566 io_geom
->stripe_index
=
6567 (io_geom
->stripe_nr
+ io_geom
->stripe_index
) % map
->num_stripes
;
6569 if (io_geom
->op
== BTRFS_MAP_READ
&& io_geom
->mirror_num
< 1)
6570 io_geom
->mirror_num
= 1;
6573 static void map_blocks_single(const struct btrfs_chunk_map
*map
,
6574 struct btrfs_io_geometry
*io_geom
)
6576 io_geom
->stripe_index
= io_geom
->stripe_nr
% map
->num_stripes
;
6577 io_geom
->stripe_nr
/= map
->num_stripes
;
6578 io_geom
->mirror_num
= io_geom
->stripe_index
+ 1;
6582 * Map one logical range to one or more physical ranges.
6584 * @length: (Mandatory) mapped length of this run.
6585 * One logical range can be split into different segments
6586 * due to factors like zones and RAID0/5/6/10 stripe
6589 * @bioc_ret: (Mandatory) returned btrfs_io_context structure.
6590 * which has one or more physical ranges (btrfs_io_stripe)
6592 * Caller should call btrfs_put_bioc() to free it after use.
6594 * @smap: (Optional) single physical range optimization.
6595 * If the map request can be fulfilled by one single
6596 * physical range, and this is parameter is not NULL,
6597 * then @bioc_ret would be NULL, and @smap would be
6600 * @mirror_num_ret: (Mandatory) returned mirror number if the original
6603 * Mirror number 0 means to choose any live mirrors.
6605 * For non-RAID56 profiles, non-zero mirror_num means
6606 * the Nth mirror. (e.g. mirror_num 1 means the first
6609 * For RAID56 profile, mirror 1 means rebuild from P and
6610 * the remaining data stripes.
6612 * For RAID6 profile, mirror > 2 means mark another
6613 * data/P stripe error and rebuild from the remaining
6616 int btrfs_map_block(struct btrfs_fs_info
*fs_info
, enum btrfs_map_op op
,
6617 u64 logical
, u64
*length
,
6618 struct btrfs_io_context
**bioc_ret
,
6619 struct btrfs_io_stripe
*smap
, int *mirror_num_ret
)
6621 struct btrfs_chunk_map
*map
;
6622 struct btrfs_io_geometry io_geom
= { 0 };
6627 struct btrfs_io_context
*bioc
= NULL
;
6628 struct btrfs_dev_replace
*dev_replace
= &fs_info
->dev_replace
;
6629 int dev_replace_is_ongoing
= 0;
6630 u16 num_alloc_stripes
;
6635 io_geom
.mirror_num
= (mirror_num_ret
? *mirror_num_ret
: 0);
6636 io_geom
.num_stripes
= 1;
6637 io_geom
.stripe_index
= 0;
6640 num_copies
= btrfs_num_copies(fs_info
, logical
, fs_info
->sectorsize
);
6641 if (io_geom
.mirror_num
> num_copies
)
6644 map
= btrfs_get_chunk_map(fs_info
, logical
, *length
);
6646 return PTR_ERR(map
);
6648 map_offset
= logical
- map
->start
;
6649 io_geom
.raid56_full_stripe_start
= (u64
)-1;
6650 max_len
= btrfs_max_io_len(map
, map_offset
, &io_geom
);
6651 *length
= min_t(u64
, map
->chunk_len
- map_offset
, max_len
);
6653 down_read(&dev_replace
->rwsem
);
6654 dev_replace_is_ongoing
= btrfs_dev_replace_is_ongoing(dev_replace
);
6656 * Hold the semaphore for read during the whole operation, write is
6657 * requested at commit time but must wait.
6659 if (!dev_replace_is_ongoing
)
6660 up_read(&dev_replace
->rwsem
);
6662 switch (map
->type
& BTRFS_BLOCK_GROUP_PROFILE_MASK
) {
6663 case BTRFS_BLOCK_GROUP_RAID0
:
6664 map_blocks_raid0(map
, &io_geom
);
6666 case BTRFS_BLOCK_GROUP_RAID1
:
6667 case BTRFS_BLOCK_GROUP_RAID1C3
:
6668 case BTRFS_BLOCK_GROUP_RAID1C4
:
6669 map_blocks_raid1(fs_info
, map
, &io_geom
, dev_replace_is_ongoing
);
6671 case BTRFS_BLOCK_GROUP_DUP
:
6672 map_blocks_dup(map
, &io_geom
);
6674 case BTRFS_BLOCK_GROUP_RAID10
:
6675 map_blocks_raid10(fs_info
, map
, &io_geom
, dev_replace_is_ongoing
);
6677 case BTRFS_BLOCK_GROUP_RAID5
:
6678 case BTRFS_BLOCK_GROUP_RAID6
:
6679 if (op
!= BTRFS_MAP_READ
|| io_geom
.mirror_num
> 1)
6680 map_blocks_raid56_write(map
, &io_geom
, logical
, length
);
6682 map_blocks_raid56_read(map
, &io_geom
);
6686 * After this, stripe_nr is the number of stripes on this
6687 * device we have to walk to find the data, and stripe_index is
6688 * the number of our device in the stripe array
6690 map_blocks_single(map
, &io_geom
);
6693 if (io_geom
.stripe_index
>= map
->num_stripes
) {
6695 "stripe index math went horribly wrong, got stripe_index=%u, num_stripes=%u",
6696 io_geom
.stripe_index
, map
->num_stripes
);
6701 num_alloc_stripes
= io_geom
.num_stripes
;
6702 if (dev_replace_is_ongoing
&& dev_replace
->tgtdev
!= NULL
&&
6703 op
!= BTRFS_MAP_READ
)
6705 * For replace case, we need to add extra stripes for extra
6706 * duplicated stripes.
6708 * For both WRITE and GET_READ_MIRRORS, we may have at most
6709 * 2 more stripes (DUP types, otherwise 1).
6711 num_alloc_stripes
+= 2;
6714 * If this I/O maps to a single device, try to return the device and
6715 * physical block information on the stack instead of allocating an
6716 * I/O context structure.
6718 if (is_single_device_io(fs_info
, smap
, map
, num_alloc_stripes
, op
,
6719 io_geom
.mirror_num
)) {
6720 ret
= set_io_stripe(fs_info
, logical
, length
, smap
, map
, &io_geom
);
6722 *mirror_num_ret
= io_geom
.mirror_num
;
6727 bioc
= alloc_btrfs_io_context(fs_info
, logical
, num_alloc_stripes
);
6732 bioc
->map_type
= map
->type
;
6735 * For RAID56 full map, we need to make sure the stripes[] follows the
6736 * rule that data stripes are all ordered, then followed with P and Q
6739 * It's still mostly the same as other profiles, just with extra rotation.
6741 if (map
->type
& BTRFS_BLOCK_GROUP_RAID56_MASK
&&
6742 (op
!= BTRFS_MAP_READ
|| io_geom
.mirror_num
> 1)) {
6744 * For RAID56 @stripe_nr is already the number of full stripes
6745 * before us, which is also the rotation value (needs to modulo
6746 * with num_stripes).
6748 * In this case, we just add @stripe_nr with @i, then do the
6749 * modulo, to reduce one modulo call.
6751 bioc
->full_stripe_logical
= map
->start
+
6752 btrfs_stripe_nr_to_offset(io_geom
.stripe_nr
*
6753 nr_data_stripes(map
));
6754 for (int i
= 0; i
< io_geom
.num_stripes
; i
++) {
6755 struct btrfs_io_stripe
*dst
= &bioc
->stripes
[i
];
6758 stripe_index
= (i
+ io_geom
.stripe_nr
) % io_geom
.num_stripes
;
6759 dst
->dev
= map
->stripes
[stripe_index
].dev
;
6761 map
->stripes
[stripe_index
].physical
+
6762 io_geom
.stripe_offset
+
6763 btrfs_stripe_nr_to_offset(io_geom
.stripe_nr
);
6767 * For all other non-RAID56 profiles, just copy the target
6768 * stripe into the bioc.
6770 for (i
= 0; i
< io_geom
.num_stripes
; i
++) {
6771 ret
= set_io_stripe(fs_info
, logical
, length
,
6772 &bioc
->stripes
[i
], map
, &io_geom
);
6775 io_geom
.stripe_index
++;
6781 btrfs_put_bioc(bioc
);
6785 if (op
!= BTRFS_MAP_READ
)
6786 io_geom
.max_errors
= btrfs_chunk_max_errors(map
);
6788 if (dev_replace_is_ongoing
&& dev_replace
->tgtdev
!= NULL
&&
6789 op
!= BTRFS_MAP_READ
) {
6790 handle_ops_on_dev_replace(op
, bioc
, dev_replace
, logical
,
6791 &io_geom
.num_stripes
, &io_geom
.max_errors
);
6795 bioc
->num_stripes
= io_geom
.num_stripes
;
6796 bioc
->max_errors
= io_geom
.max_errors
;
6797 bioc
->mirror_num
= io_geom
.mirror_num
;
6800 if (dev_replace_is_ongoing
) {
6801 lockdep_assert_held(&dev_replace
->rwsem
);
6802 /* Unlock and let waiting writers proceed */
6803 up_read(&dev_replace
->rwsem
);
6805 btrfs_free_chunk_map(map
);
6809 static bool dev_args_match_fs_devices(const struct btrfs_dev_lookup_args
*args
,
6810 const struct btrfs_fs_devices
*fs_devices
)
6812 if (args
->fsid
== NULL
)
6814 if (memcmp(fs_devices
->metadata_uuid
, args
->fsid
, BTRFS_FSID_SIZE
) == 0)
6819 static bool dev_args_match_device(const struct btrfs_dev_lookup_args
*args
,
6820 const struct btrfs_device
*device
)
6822 if (args
->missing
) {
6823 if (test_bit(BTRFS_DEV_STATE_IN_FS_METADATA
, &device
->dev_state
) &&
6829 if (device
->devid
!= args
->devid
)
6831 if (args
->uuid
&& memcmp(device
->uuid
, args
->uuid
, BTRFS_UUID_SIZE
) != 0)
6837 * Find a device specified by @devid or @uuid in the list of @fs_devices, or
6840 * If devid and uuid are both specified, the match must be exact, otherwise
6841 * only devid is used.
6843 struct btrfs_device
*btrfs_find_device(const struct btrfs_fs_devices
*fs_devices
,
6844 const struct btrfs_dev_lookup_args
*args
)
6846 struct btrfs_device
*device
;
6847 struct btrfs_fs_devices
*seed_devs
;
6849 if (dev_args_match_fs_devices(args
, fs_devices
)) {
6850 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
) {
6851 if (dev_args_match_device(args
, device
))
6856 list_for_each_entry(seed_devs
, &fs_devices
->seed_list
, seed_list
) {
6857 if (!dev_args_match_fs_devices(args
, seed_devs
))
6859 list_for_each_entry(device
, &seed_devs
->devices
, dev_list
) {
6860 if (dev_args_match_device(args
, device
))
6868 static struct btrfs_device
*add_missing_dev(struct btrfs_fs_devices
*fs_devices
,
6869 u64 devid
, u8
*dev_uuid
)
6871 struct btrfs_device
*device
;
6872 unsigned int nofs_flag
;
6875 * We call this under the chunk_mutex, so we want to use NOFS for this
6876 * allocation, however we don't want to change btrfs_alloc_device() to
6877 * always do NOFS because we use it in a lot of other GFP_KERNEL safe
6881 nofs_flag
= memalloc_nofs_save();
6882 device
= btrfs_alloc_device(NULL
, &devid
, dev_uuid
, NULL
);
6883 memalloc_nofs_restore(nofs_flag
);
6887 list_add(&device
->dev_list
, &fs_devices
->devices
);
6888 device
->fs_devices
= fs_devices
;
6889 fs_devices
->num_devices
++;
6891 set_bit(BTRFS_DEV_STATE_MISSING
, &device
->dev_state
);
6892 fs_devices
->missing_devices
++;
6898 * Allocate new device struct, set up devid and UUID.
6900 * @fs_info: used only for generating a new devid, can be NULL if
6901 * devid is provided (i.e. @devid != NULL).
6902 * @devid: a pointer to devid for this device. If NULL a new devid
6904 * @uuid: a pointer to UUID for this device. If NULL a new UUID
6906 * @path: a pointer to device path if available, NULL otherwise.
6908 * Return: a pointer to a new &struct btrfs_device on success; ERR_PTR()
6909 * on error. Returned struct is not linked onto any lists and must be
6910 * destroyed with btrfs_free_device.
6912 struct btrfs_device
*btrfs_alloc_device(struct btrfs_fs_info
*fs_info
,
6913 const u64
*devid
, const u8
*uuid
,
6916 struct btrfs_device
*dev
;
6919 if (WARN_ON(!devid
&& !fs_info
))
6920 return ERR_PTR(-EINVAL
);
6922 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
6924 return ERR_PTR(-ENOMEM
);
6926 INIT_LIST_HEAD(&dev
->dev_list
);
6927 INIT_LIST_HEAD(&dev
->dev_alloc_list
);
6928 INIT_LIST_HEAD(&dev
->post_commit_list
);
6930 atomic_set(&dev
->dev_stats_ccnt
, 0);
6931 btrfs_device_data_ordered_init(dev
);
6932 extent_io_tree_init(fs_info
, &dev
->alloc_state
, IO_TREE_DEVICE_ALLOC_STATE
);
6939 ret
= find_next_devid(fs_info
, &tmp
);
6941 btrfs_free_device(dev
);
6942 return ERR_PTR(ret
);
6948 memcpy(dev
->uuid
, uuid
, BTRFS_UUID_SIZE
);
6950 generate_random_uuid(dev
->uuid
);
6953 struct rcu_string
*name
;
6955 name
= rcu_string_strdup(path
, GFP_KERNEL
);
6957 btrfs_free_device(dev
);
6958 return ERR_PTR(-ENOMEM
);
6960 rcu_assign_pointer(dev
->name
, name
);
6966 static void btrfs_report_missing_device(struct btrfs_fs_info
*fs_info
,
6967 u64 devid
, u8
*uuid
, bool error
)
6970 btrfs_err_rl(fs_info
, "devid %llu uuid %pU is missing",
6973 btrfs_warn_rl(fs_info
, "devid %llu uuid %pU is missing",
6977 u64
btrfs_calc_stripe_length(const struct btrfs_chunk_map
*map
)
6979 const int data_stripes
= calc_data_stripes(map
->type
, map
->num_stripes
);
6981 return div_u64(map
->chunk_len
, data_stripes
);
6984 #if BITS_PER_LONG == 32
6986 * Due to page cache limit, metadata beyond BTRFS_32BIT_MAX_FILE_SIZE
6987 * can't be accessed on 32bit systems.
6989 * This function do mount time check to reject the fs if it already has
6990 * metadata chunk beyond that limit.
6992 static int check_32bit_meta_chunk(struct btrfs_fs_info
*fs_info
,
6993 u64 logical
, u64 length
, u64 type
)
6995 if (!(type
& BTRFS_BLOCK_GROUP_METADATA
))
6998 if (logical
+ length
< MAX_LFS_FILESIZE
)
7001 btrfs_err_32bit_limit(fs_info
);
7006 * This is to give early warning for any metadata chunk reaching
7007 * BTRFS_32BIT_EARLY_WARN_THRESHOLD.
7008 * Although we can still access the metadata, it's not going to be possible
7009 * once the limit is reached.
7011 static void warn_32bit_meta_chunk(struct btrfs_fs_info
*fs_info
,
7012 u64 logical
, u64 length
, u64 type
)
7014 if (!(type
& BTRFS_BLOCK_GROUP_METADATA
))
7017 if (logical
+ length
< BTRFS_32BIT_EARLY_WARN_THRESHOLD
)
7020 btrfs_warn_32bit_limit(fs_info
);
7024 static struct btrfs_device
*handle_missing_device(struct btrfs_fs_info
*fs_info
,
7025 u64 devid
, u8
*uuid
)
7027 struct btrfs_device
*dev
;
7029 if (!btrfs_test_opt(fs_info
, DEGRADED
)) {
7030 btrfs_report_missing_device(fs_info
, devid
, uuid
, true);
7031 return ERR_PTR(-ENOENT
);
7034 dev
= add_missing_dev(fs_info
->fs_devices
, devid
, uuid
);
7036 btrfs_err(fs_info
, "failed to init missing device %llu: %ld",
7037 devid
, PTR_ERR(dev
));
7040 btrfs_report_missing_device(fs_info
, devid
, uuid
, false);
7045 static int read_one_chunk(struct btrfs_key
*key
, struct extent_buffer
*leaf
,
7046 struct btrfs_chunk
*chunk
)
7048 BTRFS_DEV_LOOKUP_ARGS(args
);
7049 struct btrfs_fs_info
*fs_info
= leaf
->fs_info
;
7050 struct btrfs_chunk_map
*map
;
7055 u8 uuid
[BTRFS_UUID_SIZE
];
7061 logical
= key
->offset
;
7062 length
= btrfs_chunk_length(leaf
, chunk
);
7063 type
= btrfs_chunk_type(leaf
, chunk
);
7064 index
= btrfs_bg_flags_to_raid_index(type
);
7065 num_stripes
= btrfs_chunk_num_stripes(leaf
, chunk
);
7067 #if BITS_PER_LONG == 32
7068 ret
= check_32bit_meta_chunk(fs_info
, logical
, length
, type
);
7071 warn_32bit_meta_chunk(fs_info
, logical
, length
, type
);
7075 * Only need to verify chunk item if we're reading from sys chunk array,
7076 * as chunk item in tree block is already verified by tree-checker.
7078 if (leaf
->start
== BTRFS_SUPER_INFO_OFFSET
) {
7079 ret
= btrfs_check_chunk_valid(leaf
, chunk
, logical
);
7084 map
= btrfs_find_chunk_map(fs_info
, logical
, 1);
7086 /* already mapped? */
7087 if (map
&& map
->start
<= logical
&& map
->start
+ map
->chunk_len
> logical
) {
7088 btrfs_free_chunk_map(map
);
7091 btrfs_free_chunk_map(map
);
7094 map
= btrfs_alloc_chunk_map(num_stripes
, GFP_NOFS
);
7098 map
->start
= logical
;
7099 map
->chunk_len
= length
;
7100 map
->num_stripes
= num_stripes
;
7101 map
->io_width
= btrfs_chunk_io_width(leaf
, chunk
);
7102 map
->io_align
= btrfs_chunk_io_align(leaf
, chunk
);
7105 * We can't use the sub_stripes value, as for profiles other than
7106 * RAID10, they may have 0 as sub_stripes for filesystems created by
7107 * older mkfs (<v5.4).
7108 * In that case, it can cause divide-by-zero errors later.
7109 * Since currently sub_stripes is fixed for each profile, let's
7110 * use the trusted value instead.
7112 map
->sub_stripes
= btrfs_raid_array
[index
].sub_stripes
;
7113 map
->verified_stripes
= 0;
7114 map
->stripe_size
= btrfs_calc_stripe_length(map
);
7115 for (i
= 0; i
< num_stripes
; i
++) {
7116 map
->stripes
[i
].physical
=
7117 btrfs_stripe_offset_nr(leaf
, chunk
, i
);
7118 devid
= btrfs_stripe_devid_nr(leaf
, chunk
, i
);
7120 read_extent_buffer(leaf
, uuid
, (unsigned long)
7121 btrfs_stripe_dev_uuid_nr(chunk
, i
),
7124 map
->stripes
[i
].dev
= btrfs_find_device(fs_info
->fs_devices
, &args
);
7125 if (!map
->stripes
[i
].dev
) {
7126 map
->stripes
[i
].dev
= handle_missing_device(fs_info
,
7128 if (IS_ERR(map
->stripes
[i
].dev
)) {
7129 ret
= PTR_ERR(map
->stripes
[i
].dev
);
7130 btrfs_free_chunk_map(map
);
7135 set_bit(BTRFS_DEV_STATE_IN_FS_METADATA
,
7136 &(map
->stripes
[i
].dev
->dev_state
));
7139 ret
= btrfs_add_chunk_map(fs_info
, map
);
7142 "failed to add chunk map, start=%llu len=%llu: %d",
7143 map
->start
, map
->chunk_len
, ret
);
7149 static void fill_device_from_item(struct extent_buffer
*leaf
,
7150 struct btrfs_dev_item
*dev_item
,
7151 struct btrfs_device
*device
)
7155 device
->devid
= btrfs_device_id(leaf
, dev_item
);
7156 device
->disk_total_bytes
= btrfs_device_total_bytes(leaf
, dev_item
);
7157 device
->total_bytes
= device
->disk_total_bytes
;
7158 device
->commit_total_bytes
= device
->disk_total_bytes
;
7159 device
->bytes_used
= btrfs_device_bytes_used(leaf
, dev_item
);
7160 device
->commit_bytes_used
= device
->bytes_used
;
7161 device
->type
= btrfs_device_type(leaf
, dev_item
);
7162 device
->io_align
= btrfs_device_io_align(leaf
, dev_item
);
7163 device
->io_width
= btrfs_device_io_width(leaf
, dev_item
);
7164 device
->sector_size
= btrfs_device_sector_size(leaf
, dev_item
);
7165 WARN_ON(device
->devid
== BTRFS_DEV_REPLACE_DEVID
);
7166 clear_bit(BTRFS_DEV_STATE_REPLACE_TGT
, &device
->dev_state
);
7168 ptr
= btrfs_device_uuid(dev_item
);
7169 read_extent_buffer(leaf
, device
->uuid
, ptr
, BTRFS_UUID_SIZE
);
7172 static struct btrfs_fs_devices
*open_seed_devices(struct btrfs_fs_info
*fs_info
,
7175 struct btrfs_fs_devices
*fs_devices
;
7178 lockdep_assert_held(&uuid_mutex
);
7181 /* This will match only for multi-device seed fs */
7182 list_for_each_entry(fs_devices
, &fs_info
->fs_devices
->seed_list
, seed_list
)
7183 if (!memcmp(fs_devices
->fsid
, fsid
, BTRFS_FSID_SIZE
))
7187 fs_devices
= find_fsid(fsid
, NULL
);
7189 if (!btrfs_test_opt(fs_info
, DEGRADED
))
7190 return ERR_PTR(-ENOENT
);
7192 fs_devices
= alloc_fs_devices(fsid
);
7193 if (IS_ERR(fs_devices
))
7196 fs_devices
->seeding
= true;
7197 fs_devices
->opened
= 1;
7202 * Upon first call for a seed fs fsid, just create a private copy of the
7203 * respective fs_devices and anchor it at fs_info->fs_devices->seed_list
7205 fs_devices
= clone_fs_devices(fs_devices
);
7206 if (IS_ERR(fs_devices
))
7209 ret
= open_fs_devices(fs_devices
, BLK_OPEN_READ
, fs_info
->bdev_holder
);
7211 free_fs_devices(fs_devices
);
7212 return ERR_PTR(ret
);
7215 if (!fs_devices
->seeding
) {
7216 close_fs_devices(fs_devices
);
7217 free_fs_devices(fs_devices
);
7218 return ERR_PTR(-EINVAL
);
7221 list_add(&fs_devices
->seed_list
, &fs_info
->fs_devices
->seed_list
);
7226 static int read_one_dev(struct extent_buffer
*leaf
,
7227 struct btrfs_dev_item
*dev_item
)
7229 BTRFS_DEV_LOOKUP_ARGS(args
);
7230 struct btrfs_fs_info
*fs_info
= leaf
->fs_info
;
7231 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
7232 struct btrfs_device
*device
;
7235 u8 fs_uuid
[BTRFS_FSID_SIZE
];
7236 u8 dev_uuid
[BTRFS_UUID_SIZE
];
7238 devid
= btrfs_device_id(leaf
, dev_item
);
7240 read_extent_buffer(leaf
, dev_uuid
, btrfs_device_uuid(dev_item
),
7242 read_extent_buffer(leaf
, fs_uuid
, btrfs_device_fsid(dev_item
),
7244 args
.uuid
= dev_uuid
;
7245 args
.fsid
= fs_uuid
;
7247 if (memcmp(fs_uuid
, fs_devices
->metadata_uuid
, BTRFS_FSID_SIZE
)) {
7248 fs_devices
= open_seed_devices(fs_info
, fs_uuid
);
7249 if (IS_ERR(fs_devices
))
7250 return PTR_ERR(fs_devices
);
7253 device
= btrfs_find_device(fs_info
->fs_devices
, &args
);
7255 if (!btrfs_test_opt(fs_info
, DEGRADED
)) {
7256 btrfs_report_missing_device(fs_info
, devid
,
7261 device
= add_missing_dev(fs_devices
, devid
, dev_uuid
);
7262 if (IS_ERR(device
)) {
7264 "failed to add missing dev %llu: %ld",
7265 devid
, PTR_ERR(device
));
7266 return PTR_ERR(device
);
7268 btrfs_report_missing_device(fs_info
, devid
, dev_uuid
, false);
7270 if (!device
->bdev
) {
7271 if (!btrfs_test_opt(fs_info
, DEGRADED
)) {
7272 btrfs_report_missing_device(fs_info
,
7273 devid
, dev_uuid
, true);
7276 btrfs_report_missing_device(fs_info
, devid
,
7280 if (!device
->bdev
&&
7281 !test_bit(BTRFS_DEV_STATE_MISSING
, &device
->dev_state
)) {
7283 * this happens when a device that was properly setup
7284 * in the device info lists suddenly goes bad.
7285 * device->bdev is NULL, and so we have to set
7286 * device->missing to one here
7288 device
->fs_devices
->missing_devices
++;
7289 set_bit(BTRFS_DEV_STATE_MISSING
, &device
->dev_state
);
7292 /* Move the device to its own fs_devices */
7293 if (device
->fs_devices
!= fs_devices
) {
7294 ASSERT(test_bit(BTRFS_DEV_STATE_MISSING
,
7295 &device
->dev_state
));
7297 list_move(&device
->dev_list
, &fs_devices
->devices
);
7298 device
->fs_devices
->num_devices
--;
7299 fs_devices
->num_devices
++;
7301 device
->fs_devices
->missing_devices
--;
7302 fs_devices
->missing_devices
++;
7304 device
->fs_devices
= fs_devices
;
7308 if (device
->fs_devices
!= fs_info
->fs_devices
) {
7309 BUG_ON(test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
));
7310 if (device
->generation
!=
7311 btrfs_device_generation(leaf
, dev_item
))
7315 fill_device_from_item(leaf
, dev_item
, device
);
7317 u64 max_total_bytes
= bdev_nr_bytes(device
->bdev
);
7319 if (device
->total_bytes
> max_total_bytes
) {
7321 "device total_bytes should be at most %llu but found %llu",
7322 max_total_bytes
, device
->total_bytes
);
7326 set_bit(BTRFS_DEV_STATE_IN_FS_METADATA
, &device
->dev_state
);
7327 if (test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
) &&
7328 !test_bit(BTRFS_DEV_STATE_REPLACE_TGT
, &device
->dev_state
)) {
7329 device
->fs_devices
->total_rw_bytes
+= device
->total_bytes
;
7330 atomic64_add(device
->total_bytes
- device
->bytes_used
,
7331 &fs_info
->free_chunk_space
);
7337 int btrfs_read_sys_array(struct btrfs_fs_info
*fs_info
)
7339 struct btrfs_super_block
*super_copy
= fs_info
->super_copy
;
7340 struct extent_buffer
*sb
;
7341 struct btrfs_disk_key
*disk_key
;
7342 struct btrfs_chunk
*chunk
;
7344 unsigned long sb_array_offset
;
7351 struct btrfs_key key
;
7353 ASSERT(BTRFS_SUPER_INFO_SIZE
<= fs_info
->nodesize
);
7356 * We allocated a dummy extent, just to use extent buffer accessors.
7357 * There will be unused space after BTRFS_SUPER_INFO_SIZE, but
7358 * that's fine, we will not go beyond system chunk array anyway.
7360 sb
= alloc_dummy_extent_buffer(fs_info
, BTRFS_SUPER_INFO_OFFSET
);
7363 set_extent_buffer_uptodate(sb
);
7365 write_extent_buffer(sb
, super_copy
, 0, BTRFS_SUPER_INFO_SIZE
);
7366 array_size
= btrfs_super_sys_array_size(super_copy
);
7368 array_ptr
= super_copy
->sys_chunk_array
;
7369 sb_array_offset
= offsetof(struct btrfs_super_block
, sys_chunk_array
);
7372 while (cur_offset
< array_size
) {
7373 disk_key
= (struct btrfs_disk_key
*)array_ptr
;
7374 len
= sizeof(*disk_key
);
7375 if (cur_offset
+ len
> array_size
)
7376 goto out_short_read
;
7378 btrfs_disk_key_to_cpu(&key
, disk_key
);
7381 sb_array_offset
+= len
;
7384 if (key
.type
!= BTRFS_CHUNK_ITEM_KEY
) {
7386 "unexpected item type %u in sys_array at offset %u",
7387 (u32
)key
.type
, cur_offset
);
7392 chunk
= (struct btrfs_chunk
*)sb_array_offset
;
7394 * At least one btrfs_chunk with one stripe must be present,
7395 * exact stripe count check comes afterwards
7397 len
= btrfs_chunk_item_size(1);
7398 if (cur_offset
+ len
> array_size
)
7399 goto out_short_read
;
7401 num_stripes
= btrfs_chunk_num_stripes(sb
, chunk
);
7404 "invalid number of stripes %u in sys_array at offset %u",
7405 num_stripes
, cur_offset
);
7410 type
= btrfs_chunk_type(sb
, chunk
);
7411 if ((type
& BTRFS_BLOCK_GROUP_SYSTEM
) == 0) {
7413 "invalid chunk type %llu in sys_array at offset %u",
7419 len
= btrfs_chunk_item_size(num_stripes
);
7420 if (cur_offset
+ len
> array_size
)
7421 goto out_short_read
;
7423 ret
= read_one_chunk(&key
, sb
, chunk
);
7428 sb_array_offset
+= len
;
7431 clear_extent_buffer_uptodate(sb
);
7432 free_extent_buffer_stale(sb
);
7436 btrfs_err(fs_info
, "sys_array too short to read %u bytes at offset %u",
7438 clear_extent_buffer_uptodate(sb
);
7439 free_extent_buffer_stale(sb
);
7444 * Check if all chunks in the fs are OK for read-write degraded mount
7446 * If the @failing_dev is specified, it's accounted as missing.
7448 * Return true if all chunks meet the minimal RW mount requirements.
7449 * Return false if any chunk doesn't meet the minimal RW mount requirements.
7451 bool btrfs_check_rw_degradable(struct btrfs_fs_info
*fs_info
,
7452 struct btrfs_device
*failing_dev
)
7454 struct btrfs_chunk_map
*map
;
7458 map
= btrfs_find_chunk_map(fs_info
, 0, U64_MAX
);
7459 /* No chunk at all? Return false anyway */
7470 btrfs_get_num_tolerated_disk_barrier_failures(
7472 for (i
= 0; i
< map
->num_stripes
; i
++) {
7473 struct btrfs_device
*dev
= map
->stripes
[i
].dev
;
7475 if (!dev
|| !dev
->bdev
||
7476 test_bit(BTRFS_DEV_STATE_MISSING
, &dev
->dev_state
) ||
7477 dev
->last_flush_error
)
7479 else if (failing_dev
&& failing_dev
== dev
)
7482 if (missing
> max_tolerated
) {
7485 "chunk %llu missing %d devices, max tolerance is %d for writable mount",
7486 map
->start
, missing
, max_tolerated
);
7487 btrfs_free_chunk_map(map
);
7491 next_start
= map
->start
+ map
->chunk_len
;
7492 btrfs_free_chunk_map(map
);
7494 map
= btrfs_find_chunk_map(fs_info
, next_start
, U64_MAX
- next_start
);
7500 static void readahead_tree_node_children(struct extent_buffer
*node
)
7503 const int nr_items
= btrfs_header_nritems(node
);
7505 for (i
= 0; i
< nr_items
; i
++)
7506 btrfs_readahead_node_child(node
, i
);
7509 int btrfs_read_chunk_tree(struct btrfs_fs_info
*fs_info
)
7511 struct btrfs_root
*root
= fs_info
->chunk_root
;
7512 struct btrfs_path
*path
;
7513 struct extent_buffer
*leaf
;
7514 struct btrfs_key key
;
7515 struct btrfs_key found_key
;
7520 u64 last_ra_node
= 0;
7522 path
= btrfs_alloc_path();
7527 * uuid_mutex is needed only if we are mounting a sprout FS
7528 * otherwise we don't need it.
7530 mutex_lock(&uuid_mutex
);
7533 * It is possible for mount and umount to race in such a way that
7534 * we execute this code path, but open_fs_devices failed to clear
7535 * total_rw_bytes. We certainly want it cleared before reading the
7536 * device items, so clear it here.
7538 fs_info
->fs_devices
->total_rw_bytes
= 0;
7541 * Lockdep complains about possible circular locking dependency between
7542 * a disk's open_mutex (struct gendisk.open_mutex), the rw semaphores
7543 * used for freeze procection of a fs (struct super_block.s_writers),
7544 * which we take when starting a transaction, and extent buffers of the
7545 * chunk tree if we call read_one_dev() while holding a lock on an
7546 * extent buffer of the chunk tree. Since we are mounting the filesystem
7547 * and at this point there can't be any concurrent task modifying the
7548 * chunk tree, to keep it simple, just skip locking on the chunk tree.
7550 ASSERT(!test_bit(BTRFS_FS_OPEN
, &fs_info
->flags
));
7551 path
->skip_locking
= 1;
7554 * Read all device items, and then all the chunk items. All
7555 * device items are found before any chunk item (their object id
7556 * is smaller than the lowest possible object id for a chunk
7557 * item - BTRFS_FIRST_CHUNK_TREE_OBJECTID).
7559 key
.objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
7562 btrfs_for_each_slot(root
, &key
, &found_key
, path
, iter_ret
) {
7563 struct extent_buffer
*node
= path
->nodes
[1];
7565 leaf
= path
->nodes
[0];
7566 slot
= path
->slots
[0];
7569 if (last_ra_node
!= node
->start
) {
7570 readahead_tree_node_children(node
);
7571 last_ra_node
= node
->start
;
7574 if (found_key
.type
== BTRFS_DEV_ITEM_KEY
) {
7575 struct btrfs_dev_item
*dev_item
;
7576 dev_item
= btrfs_item_ptr(leaf
, slot
,
7577 struct btrfs_dev_item
);
7578 ret
= read_one_dev(leaf
, dev_item
);
7582 } else if (found_key
.type
== BTRFS_CHUNK_ITEM_KEY
) {
7583 struct btrfs_chunk
*chunk
;
7586 * We are only called at mount time, so no need to take
7587 * fs_info->chunk_mutex. Plus, to avoid lockdep warnings,
7588 * we always lock first fs_info->chunk_mutex before
7589 * acquiring any locks on the chunk tree. This is a
7590 * requirement for chunk allocation, see the comment on
7591 * top of btrfs_chunk_alloc() for details.
7593 chunk
= btrfs_item_ptr(leaf
, slot
, struct btrfs_chunk
);
7594 ret
= read_one_chunk(&found_key
, leaf
, chunk
);
7599 /* Catch error found during iteration */
7606 * After loading chunk tree, we've got all device information,
7607 * do another round of validation checks.
7609 if (total_dev
!= fs_info
->fs_devices
->total_devices
) {
7611 "super block num_devices %llu mismatch with DEV_ITEM count %llu, will be repaired on next transaction commit",
7612 btrfs_super_num_devices(fs_info
->super_copy
),
7614 fs_info
->fs_devices
->total_devices
= total_dev
;
7615 btrfs_set_super_num_devices(fs_info
->super_copy
, total_dev
);
7617 if (btrfs_super_total_bytes(fs_info
->super_copy
) <
7618 fs_info
->fs_devices
->total_rw_bytes
) {
7620 "super_total_bytes %llu mismatch with fs_devices total_rw_bytes %llu",
7621 btrfs_super_total_bytes(fs_info
->super_copy
),
7622 fs_info
->fs_devices
->total_rw_bytes
);
7628 mutex_unlock(&uuid_mutex
);
7630 btrfs_free_path(path
);
7634 int btrfs_init_devices_late(struct btrfs_fs_info
*fs_info
)
7636 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
, *seed_devs
;
7637 struct btrfs_device
*device
;
7640 fs_devices
->fs_info
= fs_info
;
7642 mutex_lock(&fs_devices
->device_list_mutex
);
7643 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
)
7644 device
->fs_info
= fs_info
;
7646 list_for_each_entry(seed_devs
, &fs_devices
->seed_list
, seed_list
) {
7647 list_for_each_entry(device
, &seed_devs
->devices
, dev_list
) {
7648 device
->fs_info
= fs_info
;
7649 ret
= btrfs_get_dev_zone_info(device
, false);
7654 seed_devs
->fs_info
= fs_info
;
7656 mutex_unlock(&fs_devices
->device_list_mutex
);
7661 static u64
btrfs_dev_stats_value(const struct extent_buffer
*eb
,
7662 const struct btrfs_dev_stats_item
*ptr
,
7667 read_extent_buffer(eb
, &val
,
7668 offsetof(struct btrfs_dev_stats_item
, values
) +
7669 ((unsigned long)ptr
) + (index
* sizeof(u64
)),
7674 static void btrfs_set_dev_stats_value(struct extent_buffer
*eb
,
7675 struct btrfs_dev_stats_item
*ptr
,
7678 write_extent_buffer(eb
, &val
,
7679 offsetof(struct btrfs_dev_stats_item
, values
) +
7680 ((unsigned long)ptr
) + (index
* sizeof(u64
)),
7684 static int btrfs_device_init_dev_stats(struct btrfs_device
*device
,
7685 struct btrfs_path
*path
)
7687 struct btrfs_dev_stats_item
*ptr
;
7688 struct extent_buffer
*eb
;
7689 struct btrfs_key key
;
7693 if (!device
->fs_info
->dev_root
)
7696 key
.objectid
= BTRFS_DEV_STATS_OBJECTID
;
7697 key
.type
= BTRFS_PERSISTENT_ITEM_KEY
;
7698 key
.offset
= device
->devid
;
7699 ret
= btrfs_search_slot(NULL
, device
->fs_info
->dev_root
, &key
, path
, 0, 0);
7701 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++)
7702 btrfs_dev_stat_set(device
, i
, 0);
7703 device
->dev_stats_valid
= 1;
7704 btrfs_release_path(path
);
7705 return ret
< 0 ? ret
: 0;
7707 slot
= path
->slots
[0];
7708 eb
= path
->nodes
[0];
7709 item_size
= btrfs_item_size(eb
, slot
);
7711 ptr
= btrfs_item_ptr(eb
, slot
, struct btrfs_dev_stats_item
);
7713 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++) {
7714 if (item_size
>= (1 + i
) * sizeof(__le64
))
7715 btrfs_dev_stat_set(device
, i
,
7716 btrfs_dev_stats_value(eb
, ptr
, i
));
7718 btrfs_dev_stat_set(device
, i
, 0);
7721 device
->dev_stats_valid
= 1;
7722 btrfs_dev_stat_print_on_load(device
);
7723 btrfs_release_path(path
);
7728 int btrfs_init_dev_stats(struct btrfs_fs_info
*fs_info
)
7730 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
, *seed_devs
;
7731 struct btrfs_device
*device
;
7732 struct btrfs_path
*path
= NULL
;
7735 path
= btrfs_alloc_path();
7739 mutex_lock(&fs_devices
->device_list_mutex
);
7740 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
) {
7741 ret
= btrfs_device_init_dev_stats(device
, path
);
7745 list_for_each_entry(seed_devs
, &fs_devices
->seed_list
, seed_list
) {
7746 list_for_each_entry(device
, &seed_devs
->devices
, dev_list
) {
7747 ret
= btrfs_device_init_dev_stats(device
, path
);
7753 mutex_unlock(&fs_devices
->device_list_mutex
);
7755 btrfs_free_path(path
);
7759 static int update_dev_stat_item(struct btrfs_trans_handle
*trans
,
7760 struct btrfs_device
*device
)
7762 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
7763 struct btrfs_root
*dev_root
= fs_info
->dev_root
;
7764 struct btrfs_path
*path
;
7765 struct btrfs_key key
;
7766 struct extent_buffer
*eb
;
7767 struct btrfs_dev_stats_item
*ptr
;
7771 key
.objectid
= BTRFS_DEV_STATS_OBJECTID
;
7772 key
.type
= BTRFS_PERSISTENT_ITEM_KEY
;
7773 key
.offset
= device
->devid
;
7775 path
= btrfs_alloc_path();
7778 ret
= btrfs_search_slot(trans
, dev_root
, &key
, path
, -1, 1);
7780 btrfs_warn_in_rcu(fs_info
,
7781 "error %d while searching for dev_stats item for device %s",
7782 ret
, btrfs_dev_name(device
));
7787 btrfs_item_size(path
->nodes
[0], path
->slots
[0]) < sizeof(*ptr
)) {
7788 /* need to delete old one and insert a new one */
7789 ret
= btrfs_del_item(trans
, dev_root
, path
);
7791 btrfs_warn_in_rcu(fs_info
,
7792 "delete too small dev_stats item for device %s failed %d",
7793 btrfs_dev_name(device
), ret
);
7800 /* need to insert a new item */
7801 btrfs_release_path(path
);
7802 ret
= btrfs_insert_empty_item(trans
, dev_root
, path
,
7803 &key
, sizeof(*ptr
));
7805 btrfs_warn_in_rcu(fs_info
,
7806 "insert dev_stats item for device %s failed %d",
7807 btrfs_dev_name(device
), ret
);
7812 eb
= path
->nodes
[0];
7813 ptr
= btrfs_item_ptr(eb
, path
->slots
[0], struct btrfs_dev_stats_item
);
7814 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++)
7815 btrfs_set_dev_stats_value(eb
, ptr
, i
,
7816 btrfs_dev_stat_read(device
, i
));
7817 btrfs_mark_buffer_dirty(trans
, eb
);
7820 btrfs_free_path(path
);
7825 * called from commit_transaction. Writes all changed device stats to disk.
7827 int btrfs_run_dev_stats(struct btrfs_trans_handle
*trans
)
7829 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
7830 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
7831 struct btrfs_device
*device
;
7835 mutex_lock(&fs_devices
->device_list_mutex
);
7836 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
) {
7837 stats_cnt
= atomic_read(&device
->dev_stats_ccnt
);
7838 if (!device
->dev_stats_valid
|| stats_cnt
== 0)
7843 * There is a LOAD-LOAD control dependency between the value of
7844 * dev_stats_ccnt and updating the on-disk values which requires
7845 * reading the in-memory counters. Such control dependencies
7846 * require explicit read memory barriers.
7848 * This memory barriers pairs with smp_mb__before_atomic in
7849 * btrfs_dev_stat_inc/btrfs_dev_stat_set and with the full
7850 * barrier implied by atomic_xchg in
7851 * btrfs_dev_stats_read_and_reset
7855 ret
= update_dev_stat_item(trans
, device
);
7857 atomic_sub(stats_cnt
, &device
->dev_stats_ccnt
);
7859 mutex_unlock(&fs_devices
->device_list_mutex
);
7864 void btrfs_dev_stat_inc_and_print(struct btrfs_device
*dev
, int index
)
7866 btrfs_dev_stat_inc(dev
, index
);
7868 if (!dev
->dev_stats_valid
)
7870 btrfs_err_rl_in_rcu(dev
->fs_info
,
7871 "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u",
7872 btrfs_dev_name(dev
),
7873 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_WRITE_ERRS
),
7874 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_READ_ERRS
),
7875 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_FLUSH_ERRS
),
7876 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_CORRUPTION_ERRS
),
7877 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_GENERATION_ERRS
));
7880 static void btrfs_dev_stat_print_on_load(struct btrfs_device
*dev
)
7884 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++)
7885 if (btrfs_dev_stat_read(dev
, i
) != 0)
7887 if (i
== BTRFS_DEV_STAT_VALUES_MAX
)
7888 return; /* all values == 0, suppress message */
7890 btrfs_info_in_rcu(dev
->fs_info
,
7891 "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u",
7892 btrfs_dev_name(dev
),
7893 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_WRITE_ERRS
),
7894 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_READ_ERRS
),
7895 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_FLUSH_ERRS
),
7896 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_CORRUPTION_ERRS
),
7897 btrfs_dev_stat_read(dev
, BTRFS_DEV_STAT_GENERATION_ERRS
));
7900 int btrfs_get_dev_stats(struct btrfs_fs_info
*fs_info
,
7901 struct btrfs_ioctl_get_dev_stats
*stats
)
7903 BTRFS_DEV_LOOKUP_ARGS(args
);
7904 struct btrfs_device
*dev
;
7905 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
7908 mutex_lock(&fs_devices
->device_list_mutex
);
7909 args
.devid
= stats
->devid
;
7910 dev
= btrfs_find_device(fs_info
->fs_devices
, &args
);
7911 mutex_unlock(&fs_devices
->device_list_mutex
);
7914 btrfs_warn(fs_info
, "get dev_stats failed, device not found");
7916 } else if (!dev
->dev_stats_valid
) {
7917 btrfs_warn(fs_info
, "get dev_stats failed, not yet valid");
7919 } else if (stats
->flags
& BTRFS_DEV_STATS_RESET
) {
7920 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++) {
7921 if (stats
->nr_items
> i
)
7923 btrfs_dev_stat_read_and_reset(dev
, i
);
7925 btrfs_dev_stat_set(dev
, i
, 0);
7927 btrfs_info(fs_info
, "device stats zeroed by %s (%d)",
7928 current
->comm
, task_pid_nr(current
));
7930 for (i
= 0; i
< BTRFS_DEV_STAT_VALUES_MAX
; i
++)
7931 if (stats
->nr_items
> i
)
7932 stats
->values
[i
] = btrfs_dev_stat_read(dev
, i
);
7934 if (stats
->nr_items
> BTRFS_DEV_STAT_VALUES_MAX
)
7935 stats
->nr_items
= BTRFS_DEV_STAT_VALUES_MAX
;
7940 * Update the size and bytes used for each device where it changed. This is
7941 * delayed since we would otherwise get errors while writing out the
7944 * Must be invoked during transaction commit.
7946 void btrfs_commit_device_sizes(struct btrfs_transaction
*trans
)
7948 struct btrfs_device
*curr
, *next
;
7950 ASSERT(trans
->state
== TRANS_STATE_COMMIT_DOING
);
7952 if (list_empty(&trans
->dev_update_list
))
7956 * We don't need the device_list_mutex here. This list is owned by the
7957 * transaction and the transaction must complete before the device is
7960 mutex_lock(&trans
->fs_info
->chunk_mutex
);
7961 list_for_each_entry_safe(curr
, next
, &trans
->dev_update_list
,
7963 list_del_init(&curr
->post_commit_list
);
7964 curr
->commit_total_bytes
= curr
->disk_total_bytes
;
7965 curr
->commit_bytes_used
= curr
->bytes_used
;
7967 mutex_unlock(&trans
->fs_info
->chunk_mutex
);
7971 * Multiplicity factor for simple profiles: DUP, RAID1-like and RAID10.
7973 int btrfs_bg_type_to_factor(u64 flags
)
7975 const int index
= btrfs_bg_flags_to_raid_index(flags
);
7977 return btrfs_raid_array
[index
].ncopies
;
7982 static int verify_one_dev_extent(struct btrfs_fs_info
*fs_info
,
7983 u64 chunk_offset
, u64 devid
,
7984 u64 physical_offset
, u64 physical_len
)
7986 struct btrfs_dev_lookup_args args
= { .devid
= devid
};
7987 struct btrfs_chunk_map
*map
;
7988 struct btrfs_device
*dev
;
7994 map
= btrfs_find_chunk_map(fs_info
, chunk_offset
, 1);
7997 "dev extent physical offset %llu on devid %llu doesn't have corresponding chunk",
7998 physical_offset
, devid
);
8003 stripe_len
= btrfs_calc_stripe_length(map
);
8004 if (physical_len
!= stripe_len
) {
8006 "dev extent physical offset %llu on devid %llu length doesn't match chunk %llu, have %llu expect %llu",
8007 physical_offset
, devid
, map
->start
, physical_len
,
8014 * Very old mkfs.btrfs (before v4.1) will not respect the reserved
8015 * space. Although kernel can handle it without problem, better to warn
8018 if (physical_offset
< BTRFS_DEVICE_RANGE_RESERVED
)
8020 "devid %llu physical %llu len %llu inside the reserved space",
8021 devid
, physical_offset
, physical_len
);
8023 for (i
= 0; i
< map
->num_stripes
; i
++) {
8024 if (map
->stripes
[i
].dev
->devid
== devid
&&
8025 map
->stripes
[i
].physical
== physical_offset
) {
8027 if (map
->verified_stripes
>= map
->num_stripes
) {
8029 "too many dev extents for chunk %llu found",
8034 map
->verified_stripes
++;
8040 "dev extent physical offset %llu devid %llu has no corresponding chunk",
8041 physical_offset
, devid
);
8045 /* Make sure no dev extent is beyond device boundary */
8046 dev
= btrfs_find_device(fs_info
->fs_devices
, &args
);
8048 btrfs_err(fs_info
, "failed to find devid %llu", devid
);
8053 if (physical_offset
+ physical_len
> dev
->disk_total_bytes
) {
8055 "dev extent devid %llu physical offset %llu len %llu is beyond device boundary %llu",
8056 devid
, physical_offset
, physical_len
,
8057 dev
->disk_total_bytes
);
8062 if (dev
->zone_info
) {
8063 u64 zone_size
= dev
->zone_info
->zone_size
;
8065 if (!IS_ALIGNED(physical_offset
, zone_size
) ||
8066 !IS_ALIGNED(physical_len
, zone_size
)) {
8068 "zoned: dev extent devid %llu physical offset %llu len %llu is not aligned to device zone",
8069 devid
, physical_offset
, physical_len
);
8076 btrfs_free_chunk_map(map
);
8080 static int verify_chunk_dev_extent_mapping(struct btrfs_fs_info
*fs_info
)
8082 struct rb_node
*node
;
8085 read_lock(&fs_info
->mapping_tree_lock
);
8086 for (node
= rb_first_cached(&fs_info
->mapping_tree
); node
; node
= rb_next(node
)) {
8087 struct btrfs_chunk_map
*map
;
8089 map
= rb_entry(node
, struct btrfs_chunk_map
, rb_node
);
8090 if (map
->num_stripes
!= map
->verified_stripes
) {
8092 "chunk %llu has missing dev extent, have %d expect %d",
8093 map
->start
, map
->verified_stripes
, map
->num_stripes
);
8099 read_unlock(&fs_info
->mapping_tree_lock
);
8104 * Ensure that all dev extents are mapped to correct chunk, otherwise
8105 * later chunk allocation/free would cause unexpected behavior.
8107 * NOTE: This will iterate through the whole device tree, which should be of
8108 * the same size level as the chunk tree. This slightly increases mount time.
8110 int btrfs_verify_dev_extents(struct btrfs_fs_info
*fs_info
)
8112 struct btrfs_path
*path
;
8113 struct btrfs_root
*root
= fs_info
->dev_root
;
8114 struct btrfs_key key
;
8116 u64 prev_dev_ext_end
= 0;
8120 * We don't have a dev_root because we mounted with ignorebadroots and
8121 * failed to load the root, so we want to skip the verification in this
8124 * However if the dev root is fine, but the tree itself is corrupted
8125 * we'd still fail to mount. This verification is only to make sure
8126 * writes can happen safely, so instead just bypass this check
8127 * completely in the case of IGNOREBADROOTS.
8129 if (btrfs_test_opt(fs_info
, IGNOREBADROOTS
))
8133 key
.type
= BTRFS_DEV_EXTENT_KEY
;
8136 path
= btrfs_alloc_path();
8140 path
->reada
= READA_FORWARD
;
8141 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
8145 if (path
->slots
[0] >= btrfs_header_nritems(path
->nodes
[0])) {
8146 ret
= btrfs_next_leaf(root
, path
);
8149 /* No dev extents at all? Not good */
8156 struct extent_buffer
*leaf
= path
->nodes
[0];
8157 struct btrfs_dev_extent
*dext
;
8158 int slot
= path
->slots
[0];
8160 u64 physical_offset
;
8164 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
8165 if (key
.type
!= BTRFS_DEV_EXTENT_KEY
)
8167 devid
= key
.objectid
;
8168 physical_offset
= key
.offset
;
8170 dext
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dev_extent
);
8171 chunk_offset
= btrfs_dev_extent_chunk_offset(leaf
, dext
);
8172 physical_len
= btrfs_dev_extent_length(leaf
, dext
);
8174 /* Check if this dev extent overlaps with the previous one */
8175 if (devid
== prev_devid
&& physical_offset
< prev_dev_ext_end
) {
8177 "dev extent devid %llu physical offset %llu overlap with previous dev extent end %llu",
8178 devid
, physical_offset
, prev_dev_ext_end
);
8183 ret
= verify_one_dev_extent(fs_info
, chunk_offset
, devid
,
8184 physical_offset
, physical_len
);
8188 prev_dev_ext_end
= physical_offset
+ physical_len
;
8190 ret
= btrfs_next_item(root
, path
);
8199 /* Ensure all chunks have corresponding dev extents */
8200 ret
= verify_chunk_dev_extent_mapping(fs_info
);
8202 btrfs_free_path(path
);
8207 * Check whether the given block group or device is pinned by any inode being
8208 * used as a swapfile.
8210 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info
*fs_info
, void *ptr
)
8212 struct btrfs_swapfile_pin
*sp
;
8213 struct rb_node
*node
;
8215 spin_lock(&fs_info
->swapfile_pins_lock
);
8216 node
= fs_info
->swapfile_pins
.rb_node
;
8218 sp
= rb_entry(node
, struct btrfs_swapfile_pin
, node
);
8220 node
= node
->rb_left
;
8221 else if (ptr
> sp
->ptr
)
8222 node
= node
->rb_right
;
8226 spin_unlock(&fs_info
->swapfile_pins_lock
);
8227 return node
!= NULL
;
8230 static int relocating_repair_kthread(void *data
)
8232 struct btrfs_block_group
*cache
= data
;
8233 struct btrfs_fs_info
*fs_info
= cache
->fs_info
;
8237 target
= cache
->start
;
8238 btrfs_put_block_group(cache
);
8240 sb_start_write(fs_info
->sb
);
8241 if (!btrfs_exclop_start(fs_info
, BTRFS_EXCLOP_BALANCE
)) {
8243 "zoned: skip relocating block group %llu to repair: EBUSY",
8245 sb_end_write(fs_info
->sb
);
8249 mutex_lock(&fs_info
->reclaim_bgs_lock
);
8251 /* Ensure block group still exists */
8252 cache
= btrfs_lookup_block_group(fs_info
, target
);
8256 if (!test_bit(BLOCK_GROUP_FLAG_RELOCATING_REPAIR
, &cache
->runtime_flags
))
8259 ret
= btrfs_may_alloc_data_chunk(fs_info
, target
);
8264 "zoned: relocating block group %llu to repair IO failure",
8266 ret
= btrfs_relocate_chunk(fs_info
, target
);
8270 btrfs_put_block_group(cache
);
8271 mutex_unlock(&fs_info
->reclaim_bgs_lock
);
8272 btrfs_exclop_finish(fs_info
);
8273 sb_end_write(fs_info
->sb
);
8278 bool btrfs_repair_one_zone(struct btrfs_fs_info
*fs_info
, u64 logical
)
8280 struct btrfs_block_group
*cache
;
8282 if (!btrfs_is_zoned(fs_info
))
8285 /* Do not attempt to repair in degraded state */
8286 if (btrfs_test_opt(fs_info
, DEGRADED
))
8289 cache
= btrfs_lookup_block_group(fs_info
, logical
);
8293 if (test_and_set_bit(BLOCK_GROUP_FLAG_RELOCATING_REPAIR
, &cache
->runtime_flags
)) {
8294 btrfs_put_block_group(cache
);
8298 kthread_run(relocating_repair_kthread
, cache
,
8299 "btrfs-relocating-repair");
8304 static void map_raid56_repair_block(struct btrfs_io_context
*bioc
,
8305 struct btrfs_io_stripe
*smap
,
8308 int data_stripes
= nr_bioc_data_stripes(bioc
);
8311 for (i
= 0; i
< data_stripes
; i
++) {
8312 u64 stripe_start
= bioc
->full_stripe_logical
+
8313 btrfs_stripe_nr_to_offset(i
);
8315 if (logical
>= stripe_start
&&
8316 logical
< stripe_start
+ BTRFS_STRIPE_LEN
)
8319 ASSERT(i
< data_stripes
);
8320 smap
->dev
= bioc
->stripes
[i
].dev
;
8321 smap
->physical
= bioc
->stripes
[i
].physical
+
8322 ((logical
- bioc
->full_stripe_logical
) &
8323 BTRFS_STRIPE_LEN_MASK
);
8327 * Map a repair write into a single device.
8329 * A repair write is triggered by read time repair or scrub, which would only
8330 * update the contents of a single device.
8331 * Not update any other mirrors nor go through RMW path.
8333 * Callers should ensure:
8335 * - Call btrfs_bio_counter_inc_blocked() first
8336 * - The range does not cross stripe boundary
8337 * - Has a valid @mirror_num passed in.
8339 int btrfs_map_repair_block(struct btrfs_fs_info
*fs_info
,
8340 struct btrfs_io_stripe
*smap
, u64 logical
,
8341 u32 length
, int mirror_num
)
8343 struct btrfs_io_context
*bioc
= NULL
;
8344 u64 map_length
= length
;
8345 int mirror_ret
= mirror_num
;
8348 ASSERT(mirror_num
> 0);
8350 ret
= btrfs_map_block(fs_info
, BTRFS_MAP_WRITE
, logical
, &map_length
,
8351 &bioc
, smap
, &mirror_ret
);
8355 /* The map range should not cross stripe boundary. */
8356 ASSERT(map_length
>= length
);
8358 /* Already mapped to single stripe. */
8362 /* Map the RAID56 multi-stripe writes to a single one. */
8363 if (bioc
->map_type
& BTRFS_BLOCK_GROUP_RAID56_MASK
) {
8364 map_raid56_repair_block(bioc
, smap
, logical
);
8368 ASSERT(mirror_num
<= bioc
->num_stripes
);
8369 smap
->dev
= bioc
->stripes
[mirror_num
- 1].dev
;
8370 smap
->physical
= bioc
->stripes
[mirror_num
- 1].physical
;
8372 btrfs_put_bioc(bioc
);