/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2007 Oracle. All rights reserved.
*/
#ifndef BTRFS_VOLUMES_H
#define BTRFS_VOLUMES_H
#include <linux/blk_types.h>
#include <linux/sizes.h>
#include <linux/atomic.h>
#include <linux/sort.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/log2.h>
#include <linux/kobject.h>
#include <linux/refcount.h>
#include <linux/completion.h>
#include <linux/rbtree.h>
#include <uapi/linux/btrfs.h>
#include "messages.h"
#include "rcu-string.h"
struct block_device;
struct bdev_handle;
struct btrfs_fs_info;
struct btrfs_block_group;
struct btrfs_trans_handle;
struct btrfs_zoned_device_info;
#define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G)
extern struct mutex uuid_mutex;
#define BTRFS_STRIPE_LEN SZ_64K
#define BTRFS_STRIPE_LEN_SHIFT (16)
#define BTRFS_STRIPE_LEN_MASK (BTRFS_STRIPE_LEN - 1)
static_assert(const_ilog2(BTRFS_STRIPE_LEN) == BTRFS_STRIPE_LEN_SHIFT);
/* Used by sanity check for btrfs_raid_types. */
#define const_ffs(n) (__builtin_ctzll(n) + 1)
/*
* The conversion from BTRFS_BLOCK_GROUP_* bits to btrfs_raid_type requires
* RAID0 always to be the lowest profile bit.
* Although it's part of on-disk format and should never change, do extra
* compile-time sanity checks.
*/
static_assert(const_ffs(BTRFS_BLOCK_GROUP_RAID0) <
const_ffs(BTRFS_BLOCK_GROUP_PROFILE_MASK & ~BTRFS_BLOCK_GROUP_RAID0));
static_assert(const_ilog2(BTRFS_BLOCK_GROUP_RAID0) >
ilog2(BTRFS_BLOCK_GROUP_TYPE_MASK));
/* ilog2() can handle both constants and variables */
#define BTRFS_BG_FLAG_TO_INDEX(profile) \
ilog2((profile) >> (ilog2(BTRFS_BLOCK_GROUP_RAID0) - 1))
enum btrfs_raid_types {
/* SINGLE is the special one as it doesn't have on-disk bit. */
BTRFS_RAID_SINGLE = 0,
BTRFS_RAID_RAID0 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID0),
BTRFS_RAID_RAID1 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1),
BTRFS_RAID_DUP = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_DUP),
BTRFS_RAID_RAID10 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID10),
BTRFS_RAID_RAID5 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID5),
BTRFS_RAID_RAID6 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID6),
BTRFS_RAID_RAID1C3 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C3),
BTRFS_RAID_RAID1C4 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C4),
BTRFS_NR_RAID_TYPES
};
/*
* Use sequence counter to get consistent device stat data on
* 32-bit processors.
*/
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
#include <linux/seqlock.h>
#define __BTRFS_NEED_DEVICE_DATA_ORDERED
#define btrfs_device_data_ordered_init(device) \
seqcount_init(&device->data_seqcount)
#else
#define btrfs_device_data_ordered_init(device) do { } while (0)
#endif
#define BTRFS_DEV_STATE_WRITEABLE (0)
#define BTRFS_DEV_STATE_IN_FS_METADATA (1)
#define BTRFS_DEV_STATE_MISSING (2)
#define BTRFS_DEV_STATE_REPLACE_TGT (3)
#define BTRFS_DEV_STATE_FLUSH_SENT (4)
#define BTRFS_DEV_STATE_NO_READA (5)
/* Special value encoding failure to write primary super block. */
#define BTRFS_SUPER_PRIMARY_WRITE_ERROR (INT_MAX / 2)
struct btrfs_fs_devices;
struct btrfs_device {
struct list_head dev_list; /* device_list_mutex */
struct list_head dev_alloc_list; /* chunk mutex */
struct list_head post_commit_list; /* chunk mutex */
struct btrfs_fs_devices *fs_devices;
struct btrfs_fs_info *fs_info;
struct rcu_string __rcu *name;
u64 generation;
struct file *bdev_file;
struct block_device *bdev;
struct btrfs_zoned_device_info *zone_info;
/*
* Device's major-minor number. Must be set even if the device is not
* opened (bdev == NULL), unless the device is missing.
*/
dev_t devt;
unsigned long dev_state;
blk_status_t last_flush_error;
#ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
seqcount_t data_seqcount;
#endif
/* the internal btrfs device id */
u64 devid;
/* size of the device in memory */
u64 total_bytes;
/* size of the device on disk */
u64 disk_total_bytes;
/* bytes used */
u64 bytes_used;
/* optimal io alignment for this device */
u32 io_align;
/* optimal io width for this device */
u32 io_width;
/* type and info about this device */
u64 type;
/*
* Counter of super block write errors, values larger than
* BTRFS_SUPER_PRIMARY_WRITE_ERROR encode primary super block write failure.
*/
atomic_t sb_write_errors;
/* minimal io size for this device */
u32 sector_size;
/* physical drive uuid (or lvm uuid) */
u8 uuid[BTRFS_UUID_SIZE];
/*
* size of the device on the current transaction
*
* This variant is update when committing the transaction,
* and protected by chunk mutex
*/
u64 commit_total_bytes;
/* bytes used on the current transaction */
u64 commit_bytes_used;
/* Bio used for flushing device barriers */
struct bio flush_bio;
struct completion flush_wait;
/* per-device scrub information */
struct scrub_ctx *scrub_ctx;
/* disk I/O failure stats. For detailed description refer to
* enum btrfs_dev_stat_values in ioctl.h */
int dev_stats_valid;
/* Counter to record the change of device stats */
atomic_t dev_stats_ccnt;
atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
struct extent_io_tree alloc_state;
struct completion kobj_unregister;
/* For sysfs/FSID/devinfo/devid/ */
struct kobject devid_kobj;
/* Bandwidth limit for scrub, in bytes */
u64 scrub_speed_max;
};
/*
* Block group or device which contains an active swapfile. Used for preventing
* unsafe operations while a swapfile is active.
*
* These are sorted on (ptr, inode) (note that a block group or device can
* contain more than one swapfile). We compare the pointer values because we
* don't actually care what the object is, we just need a quick check whether
* the object exists in the rbtree.
*/
struct btrfs_swapfile_pin {
struct rb_node node;
void *ptr;
struct inode *inode;
/*
* If true, ptr points to a struct btrfs_block_group. Otherwise, ptr
* points to a struct btrfs_device.
*/
bool is_block_group;
/*
* Only used when 'is_block_group' is true and it is the number of
* extents used by a swapfile for this block group ('ptr' field).
*/
int bg_extent_count;
};
/*
* If we read those variants at the context of their own lock, we needn't
* use the following helpers, reading them directly is safe.
*/
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
#define BTRFS_DEVICE_GETSET_FUNCS(name) \
static inline u64 \
btrfs_device_get_##name(const struct btrfs_device *dev) \
{ \
u64 size; \
unsigned int seq; \
\
do { \
seq = read_seqcount_begin(&dev->data_seqcount); \
size = dev->name; \
} while (read_seqcount_retry(&dev->data_seqcount, seq)); \
return size; \
} \
\
static inline void \
btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
{ \
preempt_disable(); \
write_seqcount_begin(&dev->data_seqcount); \
dev->name = size; \
write_seqcount_end(&dev->data_seqcount); \
preempt_enable(); \
}
#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
#define BTRFS_DEVICE_GETSET_FUNCS(name) \
static inline u64 \
btrfs_device_get_##name(const struct btrfs_device *dev) \
{ \
u64 size; \
\
preempt_disable(); \
size = dev->name; \
preempt_enable(); \
return size; \
} \
\
static inline void \
btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
{ \
preempt_disable(); \
dev->name = size; \
preempt_enable(); \
}
#else
#define BTRFS_DEVICE_GETSET_FUNCS(name) \
static inline u64 \
btrfs_device_get_##name(const struct btrfs_device *dev) \
{ \
return dev->name; \
} \
\
static inline void \
btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
{ \
dev->name = size; \
}
#endif
BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
enum btrfs_chunk_allocation_policy {
BTRFS_CHUNK_ALLOC_REGULAR,
BTRFS_CHUNK_ALLOC_ZONED,
};
/*
* Read policies for mirrored block group profiles, read picks the stripe based
* on these policies.
*/
enum btrfs_read_policy {
/* Use process PID to choose the stripe */
BTRFS_READ_POLICY_PID,
BTRFS_NR_READ_POLICY,
};
#ifdef CONFIG_BTRFS_DEBUG
/*
* Checksum mode - offload it to workqueues or do it synchronously in
* btrfs_submit_chunk().
*/
enum btrfs_offload_csum_mode {
/*
* Choose offloading checksum or do it synchronously automatically.
* Do it synchronously if the checksum is fast, or offload to workqueues
* otherwise.
*/
BTRFS_OFFLOAD_CSUM_AUTO,
/* Always offload checksum to workqueues. */
BTRFS_OFFLOAD_CSUM_FORCE_ON,
/* Never offload checksum to workqueues. */
BTRFS_OFFLOAD_CSUM_FORCE_OFF,
};
#endif
struct btrfs_fs_devices {
u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
/*
* UUID written into the btree blocks:
*
* - If metadata_uuid != fsid then super block must have
* BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag set.
*
* - Following shall be true at all times:
* - metadata_uuid == btrfs_header::fsid
* - metadata_uuid == btrfs_dev_item::fsid
*
* - Relations between fsid and metadata_uuid in sb and fs_devices:
* - Normal:
* fs_devices->fsid == fs_devices->metadata_uuid == sb->fsid
* sb->metadata_uuid == 0
*
* - When the BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag is set:
* fs_devices->fsid == sb->fsid
* fs_devices->metadata_uuid == sb->metadata_uuid
*
* - When in-memory fs_devices->temp_fsid is true
* fs_devices->fsid = random
* fs_devices->metadata_uuid == sb->fsid
*/
u8 metadata_uuid[BTRFS_FSID_SIZE];
struct list_head fs_list;
/*
* Number of devices under this fsid including missing and
* replace-target device and excludes seed devices.
*/
u64 num_devices;
/*
* The number of devices that successfully opened, including
* replace-target, excludes seed devices.
*/
u64 open_devices;
/* The number of devices that are under the chunk allocation list. */
u64 rw_devices;
/* Count of missing devices under this fsid excluding seed device. */
u64 missing_devices;
u64 total_rw_bytes;
/*
* Count of devices from btrfs_super_block::num_devices for this fsid,
* which includes the seed device, excludes the transient replace-target
* device.
*/
u64 total_devices;
/* Highest generation number of seen devices */
u64 latest_generation;
/*
* The mount device or a device with highest generation after removal
* or replace.
*/
struct btrfs_device *latest_dev;
/*
* All of the devices in the filesystem, protected by a mutex so we can
* safely walk it to write out the super blocks without worrying about
* adding/removing by the multi-device code. Scrubbing super block can
* kick off supers writing by holding this mutex lock.
*/
struct mutex device_list_mutex;
/* List of all devices, protected by device_list_mutex */
struct list_head devices;
/* Devices which can satisfy space allocation. Protected by * chunk_mutex. */
struct list_head alloc_list;
struct list_head seed_list;
/* Count fs-devices opened. */
int opened;
/* Set when we find or add a device that doesn't have the nonrot flag set. */
bool rotating;
/* Devices support TRIM/discard commands. */
bool discardable;
/* The filesystem is a seed filesystem. */
bool seeding;
/* The mount needs to use a randomly generated fsid. */
bool temp_fsid;
struct btrfs_fs_info *fs_info;
/* sysfs kobjects */
struct kobject fsid_kobj;
struct kobject *devices_kobj;
struct kobject *devinfo_kobj;
struct completion kobj_unregister;
enum btrfs_chunk_allocation_policy chunk_alloc_policy;
/* Policy used to read the mirrored stripes. */
enum btrfs_read_policy read_policy;
#ifdef CONFIG_BTRFS_DEBUG
/* Checksum mode - offload it or do it synchronously. */
enum btrfs_offload_csum_mode offload_csum_mode;
#endif
};
#define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \
- sizeof(struct btrfs_chunk)) \
/ sizeof(struct btrfs_stripe) + 1)
#define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \
- 2 * sizeof(struct btrfs_disk_key) \
- 2 * sizeof(struct btrfs_chunk)) \
/ sizeof(struct btrfs_stripe) + 1)
struct btrfs_io_stripe {
struct btrfs_device *dev;
/* Block mapping. */
u64 physical;
u64 length;
bool rst_search_commit_root;
/* For the endio handler. */
struct btrfs_io_context *bioc;
};
struct btrfs_discard_stripe {
struct btrfs_device *dev;
u64 physical;
u64 length;
};
/*
* Context for IO subsmission for device stripe.
*
* - Track the unfinished mirrors for mirror based profiles
* Mirror based profiles are SINGLE/DUP/RAID1/RAID10.
*
* - Contain the logical -> physical mapping info
* Used by submit_stripe_bio() for mapping logical bio
* into physical device address.
*
* - Contain device replace info
* Used by handle_ops_on_dev_replace() to copy logical bios
* into the new device.
*
* - Contain RAID56 full stripe logical bytenrs
*/
struct btrfs_io_context {
refcount_t refs;
struct btrfs_fs_info *fs_info;
/* Taken from struct btrfs_chunk_map::type. */
u64 map_type;
struct bio *orig_bio;
atomic_t error;
u16 max_errors;
u64 logical;
u64 size;
/* Raid stripe tree ordered entry. */
struct list_head rst_ordered_entry;
/*
* The total number of stripes, including the extra duplicated
* stripe for replace.
*/
u16 num_stripes;
/*
* The mirror_num of this bioc.
*
* This is for reads which use 0 as mirror_num, thus we should return a
* valid mirror_num (>0) for the reader.
*/
u16 mirror_num;
/*
* The following two members are for dev-replace case only.
*
* @replace_nr_stripes: Number of duplicated stripes which need to be
* written to replace target.
* Should be <= 2 (2 for DUP, otherwise <= 1).
* @replace_stripe_src: The array indicates where the duplicated stripes
* are from.
*
* The @replace_stripe_src[] array is mostly for RAID56 cases.
* As non-RAID56 stripes share the same contents of the mapped range,
* thus no need to bother where the duplicated ones are from.
*
* But for RAID56 case, all stripes contain different contents, thus
* we need a way to know the mapping.
*
* There is an example for the two members, using a RAID5 write:
*
* num_stripes: 4 (3 + 1 duplicated write)
* stripes[0]: dev = devid 1, physical = X
* stripes[1]: dev = devid 2, physical = Y
* stripes[2]: dev = devid 3, physical = Z
* stripes[3]: dev = devid 0, physical = Y
*
* replace_nr_stripes = 1
* replace_stripe_src = 1 <- Means stripes[1] is involved in replace.
* The duplicated stripe index would be
* (@num_stripes - 1).
*
* Note, that we can still have cases replace_nr_stripes = 2 for DUP.
* In that case, all stripes share the same content, thus we don't
* need to bother @replace_stripe_src value at all.
*/
u16 replace_nr_stripes;
s16 replace_stripe_src;
/*
* Logical bytenr of the full stripe start, only for RAID56 cases.
*
* When this value is set to other than (u64)-1, the stripes[] should
* follow this pattern:
*
* (real_stripes = num_stripes - replace_nr_stripes)
* (data_stripes = (is_raid6) ? (real_stripes - 2) : (real_stripes - 1))
*
* stripes[0]: The first data stripe
* stripes[1]: The second data stripe
* ...
* stripes[data_stripes - 1]: The last data stripe
* stripes[data_stripes]: The P stripe
* stripes[data_stripes + 1]: The Q stripe (only for RAID6).
*/
u64 full_stripe_logical;
struct btrfs_io_stripe stripes[];
};
struct btrfs_device_info {
struct btrfs_device *dev;
u64 dev_offset;
u64 max_avail;
u64 total_avail;
};
struct btrfs_raid_attr {
u8 sub_stripes; /* sub_stripes info for map */
u8 dev_stripes; /* stripes per dev */
u8 devs_max; /* max devs to use */
u8 devs_min; /* min devs needed */
u8 tolerated_failures; /* max tolerated fail devs */
u8 devs_increment; /* ndevs has to be a multiple of this */
u8 ncopies; /* how many copies to data has */
u8 nparity; /* number of stripes worth of bytes to store
* parity information */
u8 mindev_error; /* error code if min devs requisite is unmet */
const char raid_name[8]; /* name of the raid */
u64 bg_flag; /* block group flag of the raid */
};
extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
struct btrfs_chunk_map {
struct rb_node rb_node;
/* For mount time dev extent verification. */
int verified_stripes;
refcount_t refs;
u64 start;
u64 chunk_len;
u64 stripe_size;
u64 type;
int io_align;
int io_width;
int num_stripes;
int sub_stripes;
struct btrfs_io_stripe stripes[];
};
#define btrfs_chunk_map_size(n) (sizeof(struct btrfs_chunk_map) + \
(sizeof(struct btrfs_io_stripe) * (n)))
static inline void btrfs_free_chunk_map(struct btrfs_chunk_map *map)
{
if (map && refcount_dec_and_test(&map->refs)) {
ASSERT(RB_EMPTY_NODE(&map->rb_node));
kfree(map);
}
}
struct btrfs_balance_control {
struct btrfs_balance_args data;
struct btrfs_balance_args meta;
struct btrfs_balance_args sys;
u64 flags;
struct btrfs_balance_progress stat;
};
/*
* Search for a given device by the set parameters
*/
struct btrfs_dev_lookup_args {
u64 devid;
u8 *uuid;
u8 *fsid;
bool missing;
};
/* We have to initialize to -1 because BTRFS_DEV_REPLACE_DEVID is 0 */
#define BTRFS_DEV_LOOKUP_ARGS_INIT { .devid = (u64)-1 }
#define BTRFS_DEV_LOOKUP_ARGS(name) \
struct btrfs_dev_lookup_args name = BTRFS_DEV_LOOKUP_ARGS_INIT
enum btrfs_map_op {
BTRFS_MAP_READ,
BTRFS_MAP_WRITE,
BTRFS_MAP_GET_READ_MIRRORS,
};
static inline enum btrfs_map_op btrfs_op(struct bio *bio)
{
switch (bio_op(bio)) {
case REQ_OP_WRITE:
case REQ_OP_ZONE_APPEND:
return BTRFS_MAP_WRITE;
default:
WARN_ON_ONCE(1);
fallthrough;
case REQ_OP_READ:
return BTRFS_MAP_READ;
}
}
static inline unsigned long btrfs_chunk_item_size(int num_stripes)
{
ASSERT(num_stripes);
return sizeof(struct btrfs_chunk) +
sizeof(struct btrfs_stripe) * (num_stripes - 1);
}
/*
* Do the type safe conversion from stripe_nr to offset inside the chunk.
*
* @stripe_nr is u32, with left shift it can overflow u32 for chunks larger
* than 4G. This does the proper type cast to avoid overflow.
*/
static inline u64 btrfs_stripe_nr_to_offset(u32 stripe_nr)
{
return (u64)stripe_nr << BTRFS_STRIPE_LEN_SHIFT;
}
void btrfs_get_bioc(struct btrfs_io_context *bioc);
void btrfs_put_bioc(struct btrfs_io_context *bioc);
int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
u64 logical, u64 *length,
struct btrfs_io_context **bioc_ret,
struct btrfs_io_stripe *smap, int *mirror_num_ret);
int btrfs_map_repair_block(struct btrfs_fs_info *fs_info,
struct btrfs_io_stripe *smap, u64 logical,
u32 length, int mirror_num);
struct btrfs_discard_stripe *btrfs_map_discard(struct btrfs_fs_info *fs_info,
u64 logical, u64 *length_ret,
u32 *num_stripes);
int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
struct btrfs_block_group *btrfs_create_chunk(struct btrfs_trans_handle *trans,
u64 type);
void btrfs_mapping_tree_free(struct btrfs_fs_info *fs_info);
int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
blk_mode_t flags, void *holder);
struct btrfs_device *btrfs_scan_one_device(const char *path, blk_mode_t flags,
bool mount_arg_dev);
int btrfs_forget_devices(dev_t devt);
void btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices);
void btrfs_assign_next_active_device(struct btrfs_device *device,
struct btrfs_device *this_dev);
struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info,
u64 devid,
const char *devpath);
int btrfs_get_dev_args_from_path(struct btrfs_fs_info *fs_info,
struct btrfs_dev_lookup_args *args,
const char *path);
struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
const u64 *devid, const u8 *uuid,
const char *path);
void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args *args);
int btrfs_rm_device(struct btrfs_fs_info *fs_info,
struct btrfs_dev_lookup_args *args,
struct file **bdev_file);
void __exit btrfs_cleanup_fs_uuids(void);
int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
int btrfs_grow_device(struct btrfs_trans_handle *trans,
struct btrfs_device *device, u64 new_size);
struct btrfs_device *btrfs_find_device(const struct btrfs_fs_devices *fs_devices,
const struct btrfs_dev_lookup_args *args);
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path);
int btrfs_balance(struct btrfs_fs_info *fs_info,
struct btrfs_balance_control *bctl,
struct btrfs_ioctl_balance_args *bargs);
void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf);
int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
int btrfs_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset);
int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
bool btrfs_chunk_writeable(struct btrfs_fs_info *fs_info, u64 chunk_offset);
void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info,
struct btrfs_ioctl_get_dev_stats *stats);
int btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
int btrfs_run_dev_stats(struct btrfs_trans_handle *trans);
void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev);
void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev);
void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev);
int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
u64 logical, u64 len);
unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
u64 logical);
u64 btrfs_calc_stripe_length(const struct btrfs_chunk_map *map);
int btrfs_nr_parity_stripes(u64 type);
int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle *trans,
struct btrfs_block_group *bg);
int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset);
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
struct btrfs_chunk_map *btrfs_alloc_chunk_map(int num_stripes, gfp_t gfp);
int btrfs_add_chunk_map(struct btrfs_fs_info *fs_info, struct btrfs_chunk_map *map);
#endif
struct btrfs_chunk_map *btrfs_find_chunk_map(struct btrfs_fs_info *fs_info,
u64 logical, u64 length);
struct btrfs_chunk_map *btrfs_find_chunk_map_nolock(struct btrfs_fs_info *fs_info,
u64 logical, u64 length);
struct btrfs_chunk_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info,
u64 logical, u64 length);
void btrfs_remove_chunk_map(struct btrfs_fs_info *fs_info, struct btrfs_chunk_map *map);
void btrfs_release_disk_super(struct btrfs_super_block *super);
static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
int index)
{
atomic_inc(dev->dev_stat_values + index);
/*
* This memory barrier orders stores updating statistics before stores
* updating dev_stats_ccnt.
*
* It pairs with smp_rmb() in btrfs_run_dev_stats().
*/
smp_mb__before_atomic();
atomic_inc(&dev->dev_stats_ccnt);
}
static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
int index)
{
return atomic_read(dev->dev_stat_values + index);
}
static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
int index)
{
int ret;
ret = atomic_xchg(dev->dev_stat_values + index, 0);
/*
* atomic_xchg implies a full memory barriers as per atomic_t.txt:
* - RMW operations that have a return value are fully ordered;
*
* This implicit memory barriers is paired with the smp_rmb in
* btrfs_run_dev_stats
*/
atomic_inc(&dev->dev_stats_ccnt);
return ret;
}
static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
int index, unsigned long val)
{
atomic_set(dev->dev_stat_values + index, val);
/*
* This memory barrier orders stores updating statistics before stores
* updating dev_stats_ccnt.
*
* It pairs with smp_rmb() in btrfs_run_dev_stats().
*/
smp_mb__before_atomic();
atomic_inc(&dev->dev_stats_ccnt);
}
static inline const char *btrfs_dev_name(const struct btrfs_device *device)
{
if (!device || test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state))
return "<missing disk>";
else
return rcu_str_deref(device->name);
}
void btrfs_commit_device_sizes(struct btrfs_transaction *trans);
struct list_head * __attribute_const__ btrfs_get_fs_uuids(void);
bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info,
struct btrfs_device *failing_dev);
void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info, struct btrfs_device *device);
enum btrfs_raid_types __attribute_const__ btrfs_bg_flags_to_raid_index(u64 flags);
int btrfs_bg_type_to_factor(u64 flags);
const char *btrfs_bg_type_to_raid_name(u64 flags);
int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info);
bool btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical);
bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
const u8 *btrfs_sb_fsid_ptr(const struct btrfs_super_block *sb);
#endif
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