diff options
| -rw-r--r-- | fs/btrfs/bio.h | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/fs/btrfs/bio.h b/fs/btrfs/bio.h index b12f84b3b341..baaa27961cc8 100644 --- a/fs/btrfs/bio.h +++ b/fs/btrfs/bio.h @@ -26,9 +26,8 @@ struct btrfs_fs_info; typedef void (*btrfs_bio_end_io_t)(struct btrfs_bio *bbio); /* - * Additional info to pass along bio. - * - * Mostly for btrfs specific features like csum and mirror_num. + * Highlevel btrfs I/O structure. It is allocated by btrfs_bio_alloc and + * passed to btrfs_submit_bio for mapping to the physical devices. */ struct btrfs_bio { unsigned int mirror_num:7; @@ -42,7 +41,7 @@ struct btrfs_bio { unsigned int is_metadata:1; struct bvec_iter iter; - /* for direct I/O */ + /* File offset that this I/O operates on. */ u64 file_offset; /* @device is for stripe IO submission. */ @@ -62,7 +61,7 @@ struct btrfs_bio { btrfs_bio_end_io_t end_io; void *private; - /* For read end I/O handling */ + /* For internal use in read end I/O handling */ struct work_struct end_io_work; /* |