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- // SPDX-License-Identifier: GPL-2.0+
- #ifndef __BTRFS_VOLUMES_H__
- #define __BTRFS_VOLUMES_H__
- #include <fs_internal.h>
- #include "ctree.h"
- #define BTRFS_STRIPE_LEN SZ_64K
- struct btrfs_device {
- struct list_head dev_list;
- struct btrfs_root *dev_root;
- struct btrfs_fs_devices *fs_devices;
- struct blk_desc *desc;
- struct disk_partition *part;
- u64 total_devs;
- u64 super_bytes_used;
- u64 generation;
- /* the internal btrfs device id */
- u64 devid;
- /* size of the device */
- u64 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;
- /* minimal io size for this device */
- u32 sector_size;
- /* type and info about this device */
- u64 type;
- /* physical drive uuid (or lvm uuid) */
- u8 uuid[BTRFS_UUID_SIZE];
- };
- struct btrfs_fs_devices {
- u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
- u8 metadata_uuid[BTRFS_FSID_SIZE]; /* FS specific uuid */
- u64 latest_devid;
- u64 lowest_devid;
- u64 latest_trans;
- u64 total_rw_bytes;
- struct list_head devices;
- struct list_head list;
- int seeding;
- struct btrfs_fs_devices *seed;
- };
- struct btrfs_bio_stripe {
- struct btrfs_device *dev;
- u64 physical;
- };
- struct btrfs_multi_bio {
- int error;
- int num_stripes;
- struct btrfs_bio_stripe stripes[];
- };
- struct map_lookup {
- struct cache_extent ce;
- u64 type;
- int io_align;
- int io_width;
- int stripe_len;
- int sector_size;
- int num_stripes;
- int sub_stripes;
- struct btrfs_bio_stripe stripes[];
- };
- struct btrfs_raid_attr {
- int sub_stripes; /* sub_stripes info for map */
- int dev_stripes; /* stripes per dev */
- int devs_max; /* max devs to use */
- int devs_min; /* min devs needed */
- int tolerated_failures; /* max tolerated fail devs */
- int devs_increment; /* ndevs has to be a multiple of this */
- int ncopies; /* how many copies to data has */
- int nparity; /* number of stripes worth of bytes to store
- * parity information */
- 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];
- static inline enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags)
- {
- if (flags & BTRFS_BLOCK_GROUP_RAID10)
- return BTRFS_RAID_RAID10;
- else if (flags & BTRFS_BLOCK_GROUP_RAID1)
- return BTRFS_RAID_RAID1;
- else if (flags & BTRFS_BLOCK_GROUP_RAID1C3)
- return BTRFS_RAID_RAID1C3;
- else if (flags & BTRFS_BLOCK_GROUP_RAID1C4)
- return BTRFS_RAID_RAID1C4;
- else if (flags & BTRFS_BLOCK_GROUP_DUP)
- return BTRFS_RAID_DUP;
- else if (flags & BTRFS_BLOCK_GROUP_RAID0)
- return BTRFS_RAID_RAID0;
- else if (flags & BTRFS_BLOCK_GROUP_RAID5)
- return BTRFS_RAID_RAID5;
- else if (flags & BTRFS_BLOCK_GROUP_RAID6)
- return BTRFS_RAID_RAID6;
- return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
- }
- #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
- (sizeof(struct btrfs_bio_stripe) * (n)))
- #define btrfs_map_lookup_size(n) (sizeof(struct map_lookup) + \
- (sizeof(struct btrfs_bio_stripe) * (n)))
- #define BTRFS_RAID5_P_STRIPE ((u64)-2)
- #define BTRFS_RAID6_Q_STRIPE ((u64)-1)
- static inline u64 calc_stripe_length(u64 type, u64 length, int num_stripes)
- {
- u64 stripe_size;
- if (type & BTRFS_BLOCK_GROUP_RAID0) {
- stripe_size = length;
- stripe_size /= num_stripes;
- } else if (type & BTRFS_BLOCK_GROUP_RAID10) {
- stripe_size = length * 2;
- stripe_size /= num_stripes;
- } else if (type & BTRFS_BLOCK_GROUP_RAID5) {
- stripe_size = length;
- stripe_size /= (num_stripes - 1);
- } else if (type & BTRFS_BLOCK_GROUP_RAID6) {
- stripe_size = length;
- stripe_size /= (num_stripes - 2);
- } else {
- stripe_size = length;
- }
- return stripe_size;
- }
- #ifndef READ
- #define READ 0
- #define WRITE 1
- #define READA 2
- #endif
- int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
- u64 logical, u64 *length, u64 *type,
- struct btrfs_multi_bio **multi_ret, int mirror_num,
- u64 **raid_map);
- int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
- u64 logical, u64 *length,
- struct btrfs_multi_bio **multi_ret, int mirror_num,
- u64 **raid_map_ret);
- int btrfs_next_bg(struct btrfs_fs_info *map_tree, u64 *logical,
- u64 *size, u64 type);
- static inline int btrfs_next_bg_metadata(struct btrfs_fs_info *fs_info,
- u64 *logical, u64 *size)
- {
- return btrfs_next_bg(fs_info, logical, size,
- BTRFS_BLOCK_GROUP_METADATA);
- }
- static inline int btrfs_next_bg_system(struct btrfs_fs_info *fs_info,
- u64 *logical, u64 *size)
- {
- return btrfs_next_bg(fs_info, logical, size,
- BTRFS_BLOCK_GROUP_SYSTEM);
- }
- int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
- int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
- int btrfs_open_devices(struct btrfs_fs_devices *fs_devices);
- int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
- void btrfs_close_all_devices(void);
- int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
- int btrfs_scan_one_device(struct blk_desc *desc, struct disk_partition *part,
- struct btrfs_fs_devices **fs_devices_ret,
- u64 *total_devs);
- struct list_head *btrfs_scanned_uuids(void);
- struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
- u8 *uuid, u8 *fsid);
- int btrfs_check_chunk_valid(struct btrfs_fs_info *fs_info,
- struct extent_buffer *leaf,
- struct btrfs_chunk *chunk,
- int slot, u64 logical);
- u64 btrfs_stripe_length(struct btrfs_fs_info *fs_info,
- struct extent_buffer *leaf,
- struct btrfs_chunk *chunk);
- #endif
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