1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2007 Oracle. All rights reserved.
6 #ifndef BTRFS_VOLUMES_H
7 #define BTRFS_VOLUMES_H
9 #include <linux/sort.h>
10 #include <linux/btrfs.h>
11 #include "async-thread.h"
13 #include "tree-checker.h"
14 #include "rcu-string.h"
16 #define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G)
18 extern struct mutex uuid_mutex
;
20 #define BTRFS_STRIPE_LEN SZ_64K
21 #define BTRFS_STRIPE_LEN_SHIFT (16)
22 #define BTRFS_STRIPE_LEN_MASK (BTRFS_STRIPE_LEN - 1)
24 static_assert(const_ilog2(BTRFS_STRIPE_LEN
) == BTRFS_STRIPE_LEN_SHIFT
);
26 /* Used by sanity check for btrfs_raid_types. */
27 #define const_ffs(n) (__builtin_ctzll(n) + 1)
30 * The conversion from BTRFS_BLOCK_GROUP_* bits to btrfs_raid_type requires
31 * RAID0 always to be the lowest profile bit.
32 * Although it's part of on-disk format and should never change, do extra
33 * compile-time sanity checks.
35 static_assert(const_ffs(BTRFS_BLOCK_GROUP_RAID0
) <
36 const_ffs(BTRFS_BLOCK_GROUP_PROFILE_MASK
& ~BTRFS_BLOCK_GROUP_RAID0
));
37 static_assert(const_ilog2(BTRFS_BLOCK_GROUP_RAID0
) >
38 ilog2(BTRFS_BLOCK_GROUP_TYPE_MASK
));
40 /* ilog2() can handle both constants and variables */
41 #define BTRFS_BG_FLAG_TO_INDEX(profile) \
42 ilog2((profile) >> (ilog2(BTRFS_BLOCK_GROUP_RAID0) - 1))
44 enum btrfs_raid_types
{
45 /* SINGLE is the special one as it doesn't have on-disk bit. */
46 BTRFS_RAID_SINGLE
= 0,
48 BTRFS_RAID_RAID0
= BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID0
),
49 BTRFS_RAID_RAID1
= BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1
),
50 BTRFS_RAID_DUP
= BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_DUP
),
51 BTRFS_RAID_RAID10
= BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID10
),
52 BTRFS_RAID_RAID5
= BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID5
),
53 BTRFS_RAID_RAID6
= BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID6
),
54 BTRFS_RAID_RAID1C3
= BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C3
),
55 BTRFS_RAID_RAID1C4
= BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C4
),
61 * Use sequence counter to get consistent device stat data on
64 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
65 #include <linux/seqlock.h>
66 #define __BTRFS_NEED_DEVICE_DATA_ORDERED
67 #define btrfs_device_data_ordered_init(device) \
68 seqcount_init(&device->data_seqcount)
70 #define btrfs_device_data_ordered_init(device) do { } while (0)
73 #define BTRFS_DEV_STATE_WRITEABLE (0)
74 #define BTRFS_DEV_STATE_IN_FS_METADATA (1)
75 #define BTRFS_DEV_STATE_MISSING (2)
76 #define BTRFS_DEV_STATE_REPLACE_TGT (3)
77 #define BTRFS_DEV_STATE_FLUSH_SENT (4)
78 #define BTRFS_DEV_STATE_NO_READA (5)
80 struct btrfs_zoned_device_info
;
83 struct list_head dev_list
; /* device_list_mutex */
84 struct list_head dev_alloc_list
; /* chunk mutex */
85 struct list_head post_commit_list
; /* chunk mutex */
86 struct btrfs_fs_devices
*fs_devices
;
87 struct btrfs_fs_info
*fs_info
;
89 struct rcu_string __rcu
*name
;
93 struct bdev_handle
*bdev_handle
;
94 struct block_device
*bdev
;
96 struct btrfs_zoned_device_info
*zone_info
;
99 * Device's major-minor number. Must be set even if the device is not
100 * opened (bdev == NULL), unless the device is missing.
103 unsigned long dev_state
;
104 blk_status_t last_flush_error
;
106 #ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
107 seqcount_t data_seqcount
;
110 /* the internal btrfs device id */
113 /* size of the device in memory */
116 /* size of the device on disk */
117 u64 disk_total_bytes
;
122 /* optimal io alignment for this device */
125 /* optimal io width for this device */
127 /* type and info about this device */
130 /* minimal io size for this device */
133 /* physical drive uuid (or lvm uuid) */
134 u8 uuid
[BTRFS_UUID_SIZE
];
137 * size of the device on the current transaction
139 * This variant is update when committing the transaction,
140 * and protected by chunk mutex
142 u64 commit_total_bytes
;
144 /* bytes used on the current transaction */
145 u64 commit_bytes_used
;
147 /* Bio used for flushing device barriers */
148 struct bio flush_bio
;
149 struct completion flush_wait
;
151 /* per-device scrub information */
152 struct scrub_ctx
*scrub_ctx
;
154 /* disk I/O failure stats. For detailed description refer to
155 * enum btrfs_dev_stat_values in ioctl.h */
158 /* Counter to record the change of device stats */
159 atomic_t dev_stats_ccnt
;
160 atomic_t dev_stat_values
[BTRFS_DEV_STAT_VALUES_MAX
];
162 struct extent_io_tree alloc_state
;
164 struct completion kobj_unregister
;
165 /* For sysfs/FSID/devinfo/devid/ */
166 struct kobject devid_kobj
;
168 /* Bandwidth limit for scrub, in bytes */
173 * Block group or device which contains an active swapfile. Used for preventing
174 * unsafe operations while a swapfile is active.
176 * These are sorted on (ptr, inode) (note that a block group or device can
177 * contain more than one swapfile). We compare the pointer values because we
178 * don't actually care what the object is, we just need a quick check whether
179 * the object exists in the rbtree.
181 struct btrfs_swapfile_pin
{
186 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr
187 * points to a struct btrfs_device.
191 * Only used when 'is_block_group' is true and it is the number of
192 * extents used by a swapfile for this block group ('ptr' field).
198 * If we read those variants at the context of their own lock, we needn't
199 * use the following helpers, reading them directly is safe.
201 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
202 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
204 btrfs_device_get_##name(const struct btrfs_device *dev) \
210 seq = read_seqcount_begin(&dev->data_seqcount); \
212 } while (read_seqcount_retry(&dev->data_seqcount, seq)); \
217 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
220 write_seqcount_begin(&dev->data_seqcount); \
222 write_seqcount_end(&dev->data_seqcount); \
225 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
226 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
228 btrfs_device_get_##name(const struct btrfs_device *dev) \
239 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
246 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
248 btrfs_device_get_##name(const struct btrfs_device *dev) \
254 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
260 BTRFS_DEVICE_GETSET_FUNCS(total_bytes
);
261 BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes
);
262 BTRFS_DEVICE_GETSET_FUNCS(bytes_used
);
264 enum btrfs_chunk_allocation_policy
{
265 BTRFS_CHUNK_ALLOC_REGULAR
,
266 BTRFS_CHUNK_ALLOC_ZONED
,
270 * Read policies for mirrored block group profiles, read picks the stripe based
273 enum btrfs_read_policy
{
274 /* Use process PID to choose the stripe */
275 BTRFS_READ_POLICY_PID
,
276 BTRFS_NR_READ_POLICY
,
279 struct btrfs_fs_devices
{
280 u8 fsid
[BTRFS_FSID_SIZE
]; /* FS specific uuid */
283 * UUID written into the btree blocks:
285 * - If metadata_uuid != fsid then super block must have
286 * BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag set.
288 * - Following shall be true at all times:
289 * - metadata_uuid == btrfs_header::fsid
290 * - metadata_uuid == btrfs_dev_item::fsid
292 * - Relations between fsid and metadata_uuid in sb and fs_devices:
294 * fs_devices->fsid == fs_devices->metadata_uuid == sb->fsid
295 * sb->metadata_uuid == 0
297 * - When the BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag is set:
298 * fs_devices->fsid == sb->fsid
299 * fs_devices->metadata_uuid == sb->metadata_uuid
301 * - When in-memory fs_devices->temp_fsid is true
302 * fs_devices->fsid = random
303 * fs_devices->metadata_uuid == sb->fsid
305 u8 metadata_uuid
[BTRFS_FSID_SIZE
];
307 struct list_head fs_list
;
310 * Number of devices under this fsid including missing and
311 * replace-target device and excludes seed devices.
316 * The number of devices that successfully opened, including
317 * replace-target, excludes seed devices.
321 /* The number of devices that are under the chunk allocation list. */
324 /* Count of missing devices under this fsid excluding seed device. */
329 * Count of devices from btrfs_super_block::num_devices for this fsid,
330 * which includes the seed device, excludes the transient replace-target
335 /* Highest generation number of seen devices */
336 u64 latest_generation
;
339 * The mount device or a device with highest generation after removal
342 struct btrfs_device
*latest_dev
;
345 * All of the devices in the filesystem, protected by a mutex so we can
346 * safely walk it to write out the super blocks without worrying about
347 * adding/removing by the multi-device code. Scrubbing super block can
348 * kick off supers writing by holding this mutex lock.
350 struct mutex device_list_mutex
;
352 /* List of all devices, protected by device_list_mutex */
353 struct list_head devices
;
355 /* Devices which can satisfy space allocation. Protected by * chunk_mutex. */
356 struct list_head alloc_list
;
358 struct list_head seed_list
;
360 /* Count fs-devices opened. */
363 /* Set when we find or add a device that doesn't have the nonrot flag set. */
365 /* Devices support TRIM/discard commands. */
367 /* The filesystem is a seed filesystem. */
369 /* The mount needs to use a randomly generated fsid. */
372 struct btrfs_fs_info
*fs_info
;
374 struct kobject fsid_kobj
;
375 struct kobject
*devices_kobj
;
376 struct kobject
*devinfo_kobj
;
377 struct completion kobj_unregister
;
379 enum btrfs_chunk_allocation_policy chunk_alloc_policy
;
381 /* Policy used to read the mirrored stripes. */
382 enum btrfs_read_policy read_policy
;
385 #define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \
386 - sizeof(struct btrfs_chunk)) \
387 / sizeof(struct btrfs_stripe) + 1)
389 #define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \
390 - 2 * sizeof(struct btrfs_disk_key) \
391 - 2 * sizeof(struct btrfs_chunk)) \
392 / sizeof(struct btrfs_stripe) + 1)
394 struct btrfs_io_stripe
{
395 struct btrfs_device
*dev
;
400 /* For the endio handler. */
401 struct btrfs_io_context
*bioc
;
404 struct btrfs_discard_stripe
{
405 struct btrfs_device
*dev
;
411 * Context for IO subsmission for device stripe.
413 * - Track the unfinished mirrors for mirror based profiles
414 * Mirror based profiles are SINGLE/DUP/RAID1/RAID10.
416 * - Contain the logical -> physical mapping info
417 * Used by submit_stripe_bio() for mapping logical bio
418 * into physical device address.
420 * - Contain device replace info
421 * Used by handle_ops_on_dev_replace() to copy logical bios
422 * into the new device.
424 * - Contain RAID56 full stripe logical bytenrs
426 struct btrfs_io_context
{
428 struct btrfs_fs_info
*fs_info
;
429 /* Taken from struct btrfs_chunk_map::type. */
431 struct bio
*orig_bio
;
437 /* Raid stripe tree ordered entry. */
438 struct list_head rst_ordered_entry
;
441 * The total number of stripes, including the extra duplicated
442 * stripe for replace.
447 * The mirror_num of this bioc.
449 * This is for reads which use 0 as mirror_num, thus we should return a
450 * valid mirror_num (>0) for the reader.
455 * The following two members are for dev-replace case only.
457 * @replace_nr_stripes: Number of duplicated stripes which need to be
458 * written to replace target.
459 * Should be <= 2 (2 for DUP, otherwise <= 1).
460 * @replace_stripe_src: The array indicates where the duplicated stripes
463 * The @replace_stripe_src[] array is mostly for RAID56 cases.
464 * As non-RAID56 stripes share the same contents of the mapped range,
465 * thus no need to bother where the duplicated ones are from.
467 * But for RAID56 case, all stripes contain different contents, thus
468 * we need a way to know the mapping.
470 * There is an example for the two members, using a RAID5 write:
472 * num_stripes: 4 (3 + 1 duplicated write)
473 * stripes[0]: dev = devid 1, physical = X
474 * stripes[1]: dev = devid 2, physical = Y
475 * stripes[2]: dev = devid 3, physical = Z
476 * stripes[3]: dev = devid 0, physical = Y
478 * replace_nr_stripes = 1
479 * replace_stripe_src = 1 <- Means stripes[1] is involved in replace.
480 * The duplicated stripe index would be
481 * (@num_stripes - 1).
483 * Note, that we can still have cases replace_nr_stripes = 2 for DUP.
484 * In that case, all stripes share the same content, thus we don't
485 * need to bother @replace_stripe_src value at all.
487 u16 replace_nr_stripes
;
488 s16 replace_stripe_src
;
490 * Logical bytenr of the full stripe start, only for RAID56 cases.
492 * When this value is set to other than (u64)-1, the stripes[] should
493 * follow this pattern:
495 * (real_stripes = num_stripes - replace_nr_stripes)
496 * (data_stripes = (is_raid6) ? (real_stripes - 2) : (real_stripes - 1))
498 * stripes[0]: The first data stripe
499 * stripes[1]: The second data stripe
501 * stripes[data_stripes - 1]: The last data stripe
502 * stripes[data_stripes]: The P stripe
503 * stripes[data_stripes + 1]: The Q stripe (only for RAID6).
505 u64 full_stripe_logical
;
506 struct btrfs_io_stripe stripes
[];
509 struct btrfs_device_info
{
510 struct btrfs_device
*dev
;
516 struct btrfs_raid_attr
{
517 u8 sub_stripes
; /* sub_stripes info for map */
518 u8 dev_stripes
; /* stripes per dev */
519 u8 devs_max
; /* max devs to use */
520 u8 devs_min
; /* min devs needed */
521 u8 tolerated_failures
; /* max tolerated fail devs */
522 u8 devs_increment
; /* ndevs has to be a multiple of this */
523 u8 ncopies
; /* how many copies to data has */
524 u8 nparity
; /* number of stripes worth of bytes to store
525 * parity information */
526 u8 mindev_error
; /* error code if min devs requisite is unmet */
527 const char raid_name
[8]; /* name of the raid */
528 u64 bg_flag
; /* block group flag of the raid */
531 extern const struct btrfs_raid_attr btrfs_raid_array
[BTRFS_NR_RAID_TYPES
];
533 struct btrfs_chunk_map
{
534 struct rb_node rb_node
;
535 /* For mount time dev extent verification. */
536 int verified_stripes
;
546 struct btrfs_io_stripe stripes
[];
549 #define btrfs_chunk_map_size(n) (sizeof(struct btrfs_chunk_map) + \
550 (sizeof(struct btrfs_io_stripe) * (n)))
552 static inline void btrfs_free_chunk_map(struct btrfs_chunk_map
*map
)
554 if (map
&& refcount_dec_and_test(&map
->refs
)) {
555 ASSERT(RB_EMPTY_NODE(&map
->rb_node
));
560 struct btrfs_balance_args
;
561 struct btrfs_balance_progress
;
562 struct btrfs_balance_control
{
563 struct btrfs_balance_args data
;
564 struct btrfs_balance_args meta
;
565 struct btrfs_balance_args sys
;
569 struct btrfs_balance_progress stat
;
573 * Search for a given device by the set parameters
575 struct btrfs_dev_lookup_args
{
582 /* We have to initialize to -1 because BTRFS_DEV_REPLACE_DEVID is 0 */
583 #define BTRFS_DEV_LOOKUP_ARGS_INIT { .devid = (u64)-1 }
585 #define BTRFS_DEV_LOOKUP_ARGS(name) \
586 struct btrfs_dev_lookup_args name = BTRFS_DEV_LOOKUP_ARGS_INIT
591 BTRFS_MAP_GET_READ_MIRRORS
,
594 static inline enum btrfs_map_op
btrfs_op(struct bio
*bio
)
596 switch (bio_op(bio
)) {
598 case REQ_OP_ZONE_APPEND
:
599 return BTRFS_MAP_WRITE
;
604 return BTRFS_MAP_READ
;
608 static inline unsigned long btrfs_chunk_item_size(int num_stripes
)
611 return sizeof(struct btrfs_chunk
) +
612 sizeof(struct btrfs_stripe
) * (num_stripes
- 1);
616 * Do the type safe conversion from stripe_nr to offset inside the chunk.
618 * @stripe_nr is u32, with left shift it can overflow u32 for chunks larger
619 * than 4G. This does the proper type cast to avoid overflow.
621 static inline u64
btrfs_stripe_nr_to_offset(u32 stripe_nr
)
623 return (u64
)stripe_nr
<< BTRFS_STRIPE_LEN_SHIFT
;
626 void btrfs_get_bioc(struct btrfs_io_context
*bioc
);
627 void btrfs_put_bioc(struct btrfs_io_context
*bioc
);
628 int btrfs_map_block(struct btrfs_fs_info
*fs_info
, enum btrfs_map_op op
,
629 u64 logical
, u64
*length
,
630 struct btrfs_io_context
**bioc_ret
,
631 struct btrfs_io_stripe
*smap
, int *mirror_num_ret
);
632 int btrfs_map_repair_block(struct btrfs_fs_info
*fs_info
,
633 struct btrfs_io_stripe
*smap
, u64 logical
,
634 u32 length
, int mirror_num
);
635 struct btrfs_discard_stripe
*btrfs_map_discard(struct btrfs_fs_info
*fs_info
,
636 u64 logical
, u64
*length_ret
,
638 int btrfs_read_sys_array(struct btrfs_fs_info
*fs_info
);
639 int btrfs_read_chunk_tree(struct btrfs_fs_info
*fs_info
);
640 struct btrfs_block_group
*btrfs_create_chunk(struct btrfs_trans_handle
*trans
,
642 void btrfs_mapping_tree_free(struct btrfs_fs_info
*fs_info
);
643 int btrfs_open_devices(struct btrfs_fs_devices
*fs_devices
,
644 blk_mode_t flags
, void *holder
);
645 struct btrfs_device
*btrfs_scan_one_device(const char *path
, blk_mode_t flags
,
647 int btrfs_forget_devices(dev_t devt
);
648 void btrfs_close_devices(struct btrfs_fs_devices
*fs_devices
);
649 void btrfs_free_extra_devids(struct btrfs_fs_devices
*fs_devices
);
650 void btrfs_assign_next_active_device(struct btrfs_device
*device
,
651 struct btrfs_device
*this_dev
);
652 struct btrfs_device
*btrfs_find_device_by_devspec(struct btrfs_fs_info
*fs_info
,
654 const char *devpath
);
655 int btrfs_get_dev_args_from_path(struct btrfs_fs_info
*fs_info
,
656 struct btrfs_dev_lookup_args
*args
,
658 struct btrfs_device
*btrfs_alloc_device(struct btrfs_fs_info
*fs_info
,
659 const u64
*devid
, const u8
*uuid
,
661 void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args
*args
);
662 int btrfs_rm_device(struct btrfs_fs_info
*fs_info
,
663 struct btrfs_dev_lookup_args
*args
,
664 struct bdev_handle
**bdev_handle
);
665 void __exit
btrfs_cleanup_fs_uuids(void);
666 int btrfs_num_copies(struct btrfs_fs_info
*fs_info
, u64 logical
, u64 len
);
667 int btrfs_grow_device(struct btrfs_trans_handle
*trans
,
668 struct btrfs_device
*device
, u64 new_size
);
669 struct btrfs_device
*btrfs_find_device(const struct btrfs_fs_devices
*fs_devices
,
670 const struct btrfs_dev_lookup_args
*args
);
671 int btrfs_shrink_device(struct btrfs_device
*device
, u64 new_size
);
672 int btrfs_init_new_device(struct btrfs_fs_info
*fs_info
, const char *path
);
673 int btrfs_balance(struct btrfs_fs_info
*fs_info
,
674 struct btrfs_balance_control
*bctl
,
675 struct btrfs_ioctl_balance_args
*bargs
);
676 void btrfs_describe_block_groups(u64 flags
, char *buf
, u32 size_buf
);
677 int btrfs_resume_balance_async(struct btrfs_fs_info
*fs_info
);
678 int btrfs_recover_balance(struct btrfs_fs_info
*fs_info
);
679 int btrfs_pause_balance(struct btrfs_fs_info
*fs_info
);
680 int btrfs_relocate_chunk(struct btrfs_fs_info
*fs_info
, u64 chunk_offset
);
681 int btrfs_cancel_balance(struct btrfs_fs_info
*fs_info
);
682 int btrfs_create_uuid_tree(struct btrfs_fs_info
*fs_info
);
683 int btrfs_uuid_scan_kthread(void *data
);
684 bool btrfs_chunk_writeable(struct btrfs_fs_info
*fs_info
, u64 chunk_offset
);
685 void btrfs_dev_stat_inc_and_print(struct btrfs_device
*dev
, int index
);
686 int btrfs_get_dev_stats(struct btrfs_fs_info
*fs_info
,
687 struct btrfs_ioctl_get_dev_stats
*stats
);
688 int btrfs_init_devices_late(struct btrfs_fs_info
*fs_info
);
689 int btrfs_init_dev_stats(struct btrfs_fs_info
*fs_info
);
690 int btrfs_run_dev_stats(struct btrfs_trans_handle
*trans
);
691 void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device
*srcdev
);
692 void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device
*srcdev
);
693 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device
*tgtdev
);
694 int btrfs_is_parity_mirror(struct btrfs_fs_info
*fs_info
,
695 u64 logical
, u64 len
);
696 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info
*fs_info
,
698 u64
btrfs_calc_stripe_length(const struct btrfs_chunk_map
*map
);
699 int btrfs_nr_parity_stripes(u64 type
);
700 int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle
*trans
,
701 struct btrfs_block_group
*bg
);
702 int btrfs_remove_chunk(struct btrfs_trans_handle
*trans
, u64 chunk_offset
);
704 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
705 struct btrfs_chunk_map
*btrfs_alloc_chunk_map(int num_stripes
, gfp_t gfp
);
706 int btrfs_add_chunk_map(struct btrfs_fs_info
*fs_info
, struct btrfs_chunk_map
*map
);
709 struct btrfs_chunk_map
*btrfs_clone_chunk_map(struct btrfs_chunk_map
*map
, gfp_t gfp
);
710 struct btrfs_chunk_map
*btrfs_find_chunk_map(struct btrfs_fs_info
*fs_info
,
711 u64 logical
, u64 length
);
712 struct btrfs_chunk_map
*btrfs_find_chunk_map_nolock(struct btrfs_fs_info
*fs_info
,
713 u64 logical
, u64 length
);
714 struct btrfs_chunk_map
*btrfs_get_chunk_map(struct btrfs_fs_info
*fs_info
,
715 u64 logical
, u64 length
);
716 void btrfs_remove_chunk_map(struct btrfs_fs_info
*fs_info
, struct btrfs_chunk_map
*map
);
717 void btrfs_release_disk_super(struct btrfs_super_block
*super
);
719 static inline void btrfs_dev_stat_inc(struct btrfs_device
*dev
,
722 atomic_inc(dev
->dev_stat_values
+ index
);
724 * This memory barrier orders stores updating statistics before stores
725 * updating dev_stats_ccnt.
727 * It pairs with smp_rmb() in btrfs_run_dev_stats().
729 smp_mb__before_atomic();
730 atomic_inc(&dev
->dev_stats_ccnt
);
733 static inline int btrfs_dev_stat_read(struct btrfs_device
*dev
,
736 return atomic_read(dev
->dev_stat_values
+ index
);
739 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device
*dev
,
744 ret
= atomic_xchg(dev
->dev_stat_values
+ index
, 0);
746 * atomic_xchg implies a full memory barriers as per atomic_t.txt:
747 * - RMW operations that have a return value are fully ordered;
749 * This implicit memory barriers is paired with the smp_rmb in
750 * btrfs_run_dev_stats
752 atomic_inc(&dev
->dev_stats_ccnt
);
756 static inline void btrfs_dev_stat_set(struct btrfs_device
*dev
,
757 int index
, unsigned long val
)
759 atomic_set(dev
->dev_stat_values
+ index
, val
);
761 * This memory barrier orders stores updating statistics before stores
762 * updating dev_stats_ccnt.
764 * It pairs with smp_rmb() in btrfs_run_dev_stats().
766 smp_mb__before_atomic();
767 atomic_inc(&dev
->dev_stats_ccnt
);
770 static inline const char *btrfs_dev_name(const struct btrfs_device
*device
)
772 if (!device
|| test_bit(BTRFS_DEV_STATE_MISSING
, &device
->dev_state
))
773 return "<missing disk>";
775 return rcu_str_deref(device
->name
);
778 void btrfs_commit_device_sizes(struct btrfs_transaction
*trans
);
780 struct list_head
* __attribute_const__
btrfs_get_fs_uuids(void);
781 bool btrfs_check_rw_degradable(struct btrfs_fs_info
*fs_info
,
782 struct btrfs_device
*failing_dev
);
783 void btrfs_scratch_superblocks(struct btrfs_fs_info
*fs_info
,
784 struct block_device
*bdev
,
785 const char *device_path
);
787 enum btrfs_raid_types __attribute_const__
btrfs_bg_flags_to_raid_index(u64 flags
);
788 int btrfs_bg_type_to_factor(u64 flags
);
789 const char *btrfs_bg_type_to_raid_name(u64 flags
);
790 int btrfs_verify_dev_extents(struct btrfs_fs_info
*fs_info
);
791 bool btrfs_repair_one_zone(struct btrfs_fs_info
*fs_info
, u64 logical
);
793 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info
*fs_info
, void *ptr
);
794 u8
*btrfs_sb_fsid_ptr(struct btrfs_super_block
*sb
);