diff options
Diffstat (limited to 'fs/btrfs/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 119 |
1 files changed, 88 insertions, 31 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 2183361db614..3b8130680749 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -236,17 +236,40 @@ struct btrfs_fs_devices { 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; - struct block_device *latest_bdev; + /* + * 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 @@ -300,48 +323,62 @@ struct btrfs_fs_devices { / sizeof(struct btrfs_stripe) + 1) /* - * we need the mirror number and stripe index to be passed around - * the call chain while we are processing end_io (especially errors). - * Really, what we need is a btrfs_bio structure that has this info - * and is properly sized with its stripe array, but we're not there - * quite yet. We have our own btrfs bioset, and all of the bios - * we allocate are actually btrfs_io_bios. We'll cram as much of - * struct btrfs_bio as we can into this over time. + * Additional info to pass along bio. + * + * Mostly for btrfs specific features like csum and mirror_num. */ -struct btrfs_io_bio { +struct btrfs_bio { unsigned int mirror_num; + + /* @device is for stripe IO submission. */ struct btrfs_device *device; - u64 logical; u8 *csum; u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE]; struct bvec_iter iter; + /* * This member must come last, bio_alloc_bioset will allocate enough - * bytes for entire btrfs_io_bio but relies on bio being last. + * bytes for entire btrfs_bio but relies on bio being last. */ struct bio bio; }; -static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio) +static inline struct btrfs_bio *btrfs_bio(struct bio *bio) { - return container_of(bio, struct btrfs_io_bio, bio); + return container_of(bio, struct btrfs_bio, bio); } -static inline void btrfs_io_bio_free_csum(struct btrfs_io_bio *io_bio) +static inline void btrfs_bio_free_csum(struct btrfs_bio *bbio) { - if (io_bio->csum != io_bio->csum_inline) { - kfree(io_bio->csum); - io_bio->csum = NULL; + if (bbio->csum != bbio->csum_inline) { + kfree(bbio->csum); + bbio->csum = NULL; } } -struct btrfs_bio_stripe { +struct btrfs_io_stripe { struct btrfs_device *dev; u64 physical; u64 length; /* only used for discard mappings */ }; -struct btrfs_bio { +/* + * 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; atomic_t stripes_pending; struct btrfs_fs_info *fs_info; @@ -361,7 +398,7 @@ struct btrfs_bio { * so raid_map[0] is the start of our full stripe */ u64 *raid_map; - struct btrfs_bio_stripe stripes[]; + struct btrfs_io_stripe stripes[]; }; struct btrfs_device_info { @@ -396,11 +433,11 @@ struct map_lookup { int num_stripes; int sub_stripes; int verified_stripes; /* For mount time dev extent verification */ - struct btrfs_bio_stripe stripes[]; + struct btrfs_io_stripe stripes[]; }; #define map_lookup_size(n) (sizeof(struct map_lookup) + \ - (sizeof(struct btrfs_bio_stripe) * (n))) + (sizeof(struct btrfs_io_stripe) * (n))) struct btrfs_balance_args; struct btrfs_balance_progress; @@ -414,6 +451,22 @@ struct btrfs_balance_control { 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, @@ -437,20 +490,20 @@ static inline enum btrfs_map_op btrfs_op(struct bio *bio) } } -void btrfs_get_bbio(struct btrfs_bio *bbio); -void btrfs_put_bbio(struct btrfs_bio *bbio); +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_bio **bbio_ret, int mirror_num); + 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_bio **bbio_ret); + struct btrfs_io_context **bioc_ret); 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_alloc_chunk(struct btrfs_trans_handle *trans, +struct btrfs_block_group *btrfs_create_chunk(struct btrfs_trans_handle *trans, u64 type); void btrfs_mapping_tree_free(struct extent_map_tree *tree); blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio, @@ -467,19 +520,23 @@ void btrfs_assign_next_active_device(struct btrfs_device *device, 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, - const char *device_path, u64 devid, + 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(struct btrfs_fs_devices *fs_devices, - u64 devid, u8 *uuid, u8 *fsid); +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, @@ -493,7 +550,7 @@ 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); -int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset); +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); 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