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block: shrink bio size again 

The recent ops split grew the bio by adding the new ioprio field.
Shrink it again by using a 16-bit field for the bi_flags value and
filling the holes near the beginning of the structure.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2016-07-19 11:28:43 +02:00 committed by Jens Axboe
parent ed996a52c8
commit c0acf12a50
1 changed files with 3 additions and 3 deletions
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6
include/linux/blk_types.h
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@ -46,11 +46,11 @@ struct bvec_iter {
struct bio {
struct bio *bi_next; /* request queue link */
struct block_device *bi_bdev;
unsigned int bi_flags; /* status, command, etc */
int bi_error;
unsigned int bi_rw; /* bottom bits req flags,
* top bits REQ_OP
*/
unsigned short bi_flags; /* status, command, etc */
unsigned short bi_ioprio;
struct bvec_iter bi_iter;
@ -136,7 +136,7 @@ struct bio {
* Flags starting here get preserved by bio_reset() - this includes
* BVEC_POOL_IDX()
*/
#define BIO_RESET_BITS 13
#define BIO_RESET_BITS 10
/*
* We support 6 different bvec pools, the last one is magic in that it
@ -151,7 +151,7 @@ struct bio {
* freed.
*/
#define BVEC_POOL_BITS (4)
#define BVEC_POOL_OFFSET (32 - BVEC_POOL_BITS)
#define BVEC_POOL_OFFSET (16 - BVEC_POOL_BITS)
#define BVEC_POOL_IDX(bio) ((bio)->bi_flags >> BVEC_POOL_OFFSET)
#endif /* CONFIG_BLOCK */