| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright (C) 2007 Oracle. All rights reserved. |
| */ |
| |
| #ifndef BTRFS_VOLUMES_H |
| #define BTRFS_VOLUMES_H |
| |
| #include <linux/bio.h> |
| #include <linux/sort.h> |
| #include <linux/btrfs.h> |
| #include "async-thread.h" |
| |
| #define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G) |
| |
| extern struct mutex uuid_mutex; |
| |
| #define BTRFS_STRIPE_LEN SZ_64K |
| |
| /* 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 |
| }; |
| |
| struct btrfs_io_geometry { |
| /* remaining bytes before crossing a stripe */ |
| u64 len; |
| /* offset of logical address in chunk */ |
| u64 offset; |
| /* length of single IO stripe */ |
| u32 stripe_len; |
| /* offset of address in stripe */ |
| u32 stripe_offset; |
| /* number of stripe where address falls */ |
| u64 stripe_nr; |
| /* offset of raid56 stripe into the chunk */ |
| u64 raid56_stripe_offset; |
| }; |
| |
| /* |
| * 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) |
| |
| struct btrfs_zoned_device_info; |
| |
| 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 block_device *bdev; |
| |
| struct btrfs_zoned_device_info *zone_info; |
| |
| /* the mode sent to blkdev_get */ |
| fmode_t mode; |
| |
| /* |
| * 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; |
| |
| /* 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, |
| }; |
| |
| struct btrfs_fs_devices { |
| u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ |
| u8 metadata_uuid[BTRFS_FSID_SIZE]; |
| bool fsid_change; |
| 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 FS, protected by a mutex |
| * so we can safely walk it to write out the supers without |
| * worrying about add/remove by the multi-device code. |
| * Scrubbing super 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; |
| bool seeding; |
| |
| int opened; |
| |
| /* set when we find or add a device that doesn't have the |
| * nonrot flag set |
| */ |
| bool rotating; |
| |
| 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; |
| }; |
| |
| #define BTRFS_BIO_INLINE_CSUM_SIZE 64 |
| |
| #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) |
| |
| /* |
| * Maximum number of sectors for a single bio to limit the size of the |
| * checksum array. This matches the number of bio_vecs per bio and thus the |
| * I/O size for buffered I/O. |
| */ |
| #define BTRFS_MAX_BIO_SECTORS (256) |
| |
| typedef void (*btrfs_bio_end_io_t)(struct btrfs_bio *bbio); |
| |
| /* |
| * Additional info to pass along bio. |
| * |
| * Mostly for btrfs specific features like csum and mirror_num. |
| */ |
| struct btrfs_bio { |
| unsigned int mirror_num; |
| struct bvec_iter iter; |
| |
| /* for direct I/O */ |
| u64 file_offset; |
| |
| /* @device is for stripe IO submission. */ |
| struct btrfs_device *device; |
| u8 *csum; |
| u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE]; |
| |
| /* End I/O information supplied to btrfs_bio_alloc */ |
| btrfs_bio_end_io_t end_io; |
| void *private; |
| |
| /* For read end I/O handling */ |
| struct work_struct end_io_work; |
| |
| /* |
| * This member must come last, bio_alloc_bioset will allocate enough |
| * bytes for entire btrfs_bio but relies on bio being last. |
| */ |
| struct bio bio; |
| }; |
| |
| static inline struct btrfs_bio *btrfs_bio(struct bio *bio) |
| { |
| return container_of(bio, struct btrfs_bio, bio); |
| } |
| |
| int __init btrfs_bioset_init(void); |
| void __cold btrfs_bioset_exit(void); |
| |
| struct bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf, |
| btrfs_bio_end_io_t end_io, void *private); |
| struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size, |
| btrfs_bio_end_io_t end_io, void *private); |
| |
| static inline void btrfs_bio_end_io(struct btrfs_bio *bbio, blk_status_t status) |
| { |
| bbio->bio.bi_status = status; |
| bbio->end_io(bbio); |
| } |
| |
| static inline void btrfs_bio_free_csum(struct btrfs_bio *bbio) |
| { |
| if (bbio->csum != bbio->csum_inline) { |
| kfree(bbio->csum); |
| bbio->csum = NULL; |
| } |
| } |
| |
| /* |
| * Iterate through a btrfs_bio (@bbio) on a per-sector basis. |
| * |
| * bvl - struct bio_vec |
| * bbio - struct btrfs_bio |
| * iters - struct bvec_iter |
| * bio_offset - unsigned int |
| */ |
| #define btrfs_bio_for_each_sector(fs_info, bvl, bbio, iter, bio_offset) \ |
| for ((iter) = (bbio)->iter, (bio_offset) = 0; \ |
| (iter).bi_size && \ |
| (((bvl) = bio_iter_iovec((&(bbio)->bio), (iter))), 1); \ |
| (bio_offset) += fs_info->sectorsize, \ |
| bio_advance_iter_single(&(bbio)->bio, &(iter), \ |
| (fs_info)->sectorsize)) |
| |
| struct btrfs_io_stripe { |
| struct btrfs_device *dev; |
| union { |
| /* Block mapping */ |
| u64 physical; |
| /* 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; |
| u64 map_type; /* get from map_lookup->type */ |
| struct bio *orig_bio; |
| atomic_t error; |
| int max_errors; |
| int num_stripes; |
| int mirror_num; |
| int num_tgtdevs; |
| int *tgtdev_map; |
| /* |
| * logical block numbers for the start of each stripe |
| * The last one or two are p/q. These are sorted, |
| * so raid_map[0] is the start of our full stripe |
| */ |
| u64 *raid_map; |
| 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 map_lookup { |
| u64 type; |
| int io_align; |
| int io_width; |
| u32 stripe_len; |
| int num_stripes; |
| int sub_stripes; |
| int verified_stripes; /* For mount time dev extent verification */ |
| struct btrfs_io_stripe stripes[]; |
| }; |
| |
| #define map_lookup_size(n) (sizeof(struct map_lookup) + \ |
| (sizeof(struct btrfs_io_stripe) * (n))) |
| |
| struct btrfs_balance_args; |
| struct btrfs_balance_progress; |
| 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_DISCARD, |
| BTRFS_MAP_GET_READ_MIRRORS, |
| }; |
| |
| static inline enum btrfs_map_op btrfs_op(struct bio *bio) |
| { |
| switch (bio_op(bio)) { |
| case REQ_OP_DISCARD: |
| return BTRFS_MAP_DISCARD; |
| 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; |
| } |
| } |
| |
| 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, int mirror_num); |
| int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, |
| u64 logical, u64 *length, |
| struct btrfs_io_context **bioc_ret); |
| struct btrfs_discard_stripe *btrfs_map_discard(struct btrfs_fs_info *fs_info, |
| u64 logical, u64 *length_ret, |
| u32 *num_stripes); |
| int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, struct extent_map *map, |
| enum btrfs_map_op op, u64 logical, |
| struct btrfs_io_geometry *io_geom); |
| 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 extent_map_tree *tree); |
| void btrfs_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio, int mirror_num); |
| int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
| fmode_t flags, void *holder); |
| struct btrfs_device *btrfs_scan_one_device(const char *path, |
| fmode_t flags, void *holder); |
| 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); |
| void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args *args); |
| void btrfs_free_device(struct btrfs_device *device); |
| int btrfs_rm_device(struct btrfs_fs_info *fs_info, |
| struct btrfs_dev_lookup_args *args, |
| struct block_device **bdev, fmode_t *mode); |
| 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); |
| int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info); |
| int btrfs_uuid_scan_kthread(void *data); |
| bool btrfs_chunk_writeable(struct btrfs_fs_info *fs_info, u64 chunk_offset); |
| int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes, |
| u64 *start, u64 *max_avail); |
| 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 extent_map *em); |
| 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); |
| struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info, |
| u64 logical, u64 length); |
| 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); |
| } |
| |
| 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 block_device *bdev, |
| const char *device_path); |
| |
| 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); |
| |
| #endif |