diff options
| author | Nikolay Borisov <nborisov@suse.com> | 2019-06-03 11:05:03 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2019-07-02 12:30:49 +0200 |
| commit | 5f1411265e16b257a945a5c9044aecbc7bb99443 (patch) | |
| tree | c6270dc450d463bd4da25551ea200c3266b2038b /fs/btrfs/volumes.h | |
| parent | btrfs: improve messages when updating feature flags (diff) | |
| download | linux-5f1411265e16b257a945a5c9044aecbc7bb99443.tar.xz linux-5f1411265e16b257a945a5c9044aecbc7bb99443.zip | |
btrfs: Introduce btrfs_io_geometry infrastructure
Add a structure that holds various parameters for IO calculations and a
helper that fills the values. This will help further refactoring and
reduction of functions that in some way open-coded the calculations.
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index fea7b65a712e..2a8e398a8742 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -23,6 +23,21 @@ struct btrfs_pending_bios { struct bio *tail; }; +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 */ + u64 stripe_len; + /* number of stripe where address falls */ + u64 stripe_nr; + /* offset of address in stripe */ + u64 stripe_offset; + /* offset of raid56 stripe into the chunk */ + u64 raid56_stripe_offset; +}; + /* * Use sequence counter to get consistent device stat data on * 32-bit processors. @@ -413,6 +428,8 @@ int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, u64 logical, u64 *length, struct btrfs_bio **bbio_ret); +int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, + u64 logical, u64 len, struct btrfs_io_geometry *io_geom); int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start, u64 physical, u64 **logical, int *naddrs, int *stripe_len); int btrfs_read_sys_array(struct btrfs_fs_info *fs_info); |