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btrfs: merge struct extent_page_data to btrfs_bio_ctrl
The two structures appear on the same call paths, btrfs_bio_ctrl is
embedded in extent_page_data and we pass bio_ctrl to some functions.
After merging there are fewer indirections and we have only one control
structure. The packing remains same.
The btrfs_bio_ctrl was selected as the target structure as the operation
is closer to bio processing.
Structure layout:
struct btrfs_bio_ctrl {
struct bio * bio; /* 0 8 */
int mirror_num; /* 8 4 */
enum btrfs_compression_type compress_type; /* 12 4 */
u32 len_to_stripe_boundary; /* 16 4 */
u32 len_to_oe_boundary; /* 20 4 */
btrfs_bio_end_io_t end_io_func; /* 24 8 */
bool extent_locked; /* 32 1 */
bool sync_io; /* 33 1 */
/* size: 40, cachelines: 1, members: 8 */
/* padding: 6 */
/* last cacheline: 40 bytes */
};
Signed-off-by: David Sterba <dsterba@suse.com>