/* 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 … extern struct mutex uuid_mutex; #define BTRFS_STRIPE_LEN … #define BTRFS_STRIPE_LEN_SHIFT … #define BTRFS_STRIPE_LEN_MASK … static_assert(…); /* Used by sanity check for btrfs_raid_types. */ #define const_ffs(n) … /* * 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(…); static_assert(…); /* ilog2() can handle both constants and variables */ #define BTRFS_BG_FLAG_TO_INDEX(profile) … enum btrfs_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 … #else #define btrfs_device_data_ordered_init(device) … #endif #define BTRFS_DEV_STATE_WRITEABLE … #define BTRFS_DEV_STATE_IN_FS_METADATA … #define BTRFS_DEV_STATE_MISSING … #define BTRFS_DEV_STATE_REPLACE_TGT … #define BTRFS_DEV_STATE_FLUSH_SENT … #define BTRFS_DEV_STATE_NO_READA … /* Special value encoding failure to write primary super block. */ #define BTRFS_SUPER_PRIMARY_WRITE_ERROR … struct btrfs_fs_devices; struct btrfs_device { … }; /* * 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 { … }; /* * 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 … #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION) #define BTRFS_DEVICE_GETSET_FUNCS … #else #define BTRFS_DEVICE_GETSET_FUNCS(name) … #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 { … }; /* * Read policies for mirrored block group profiles, read picks the stripe based * on these policies. */ enum btrfs_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 { … }; #endif struct btrfs_fs_devices { … }; #define BTRFS_MAX_DEVS(info) … #define BTRFS_MAX_DEVS_SYS_CHUNK … struct btrfs_io_stripe { … }; struct btrfs_discard_stripe { … }; /* * 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 { … }; struct btrfs_device_info { … }; struct btrfs_raid_attr { … }; extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES]; struct btrfs_chunk_map { … }; #define btrfs_chunk_map_size(n) … static inline void btrfs_free_chunk_map(struct btrfs_chunk_map *map) { … } struct btrfs_balance_control { … }; /* * Search for a given device by the set parameters */ struct btrfs_dev_lookup_args { … }; /* We have to initialize to -1 because BTRFS_DEV_REPLACE_DEVID is 0 */ #define BTRFS_DEV_LOOKUP_ARGS_INIT … #define BTRFS_DEV_LOOKUP_ARGS(name) … enum btrfs_map_op { … }; static inline enum btrfs_map_op btrfs_op(struct bio *bio) { … } static inline unsigned long btrfs_chunk_item_size(int num_stripes) { … } /* * 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) { … } 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); 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); 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) { … } static inline int btrfs_dev_stat_read(struct btrfs_device *dev, int index) { … } static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev, int index) { … } static inline void btrfs_dev_stat_set(struct btrfs_device *dev, int index, unsigned long val) { … } static inline const char *btrfs_dev_name(const struct btrfs_device *device) { … } 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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