diff options
Diffstat (limited to 'fs/btrfs/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h new file mode 100644 index 0000000000..32e39382a8 --- /dev/null +++ b/fs/btrfs/volumes.h @@ -0,0 +1,202 @@ +// 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_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 |