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[PATCH] struct request: shrink and optimize some more

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Move some members around and unionize completion_data and rb_node since
they cannot ever be used at the same time.

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe 2006-08-10 09:00:21 +02:00 committed by Jens Axboe
parent 51da90fcb6
commit e6a1c874a0
1 changed files with 13 additions and 7 deletions
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20
include/linux/blkdev.h
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@ -211,6 +211,8 @@ struct request {
struct list_head queuelist;
struct list_head donelist;
request_queue_t *q;
unsigned int cmd_flags;
enum rq_cmd_type_bits cmd_type;
@ -219,12 +221,12 @@ struct request {
*/
sector_t sector; /* next sector to submit */
sector_t hard_sector; /* next sector to complete */
unsigned long nr_sectors; /* no. of sectors left to submit */
unsigned long hard_nr_sectors; /* no. of sectors left to complete */
/* no. of sectors left to submit in the current segment */
unsigned int current_nr_sectors;
sector_t hard_sector; /* next sector to complete */
unsigned long hard_nr_sectors; /* no. of sectors left to complete */
/* no. of sectors left to complete in the current segment */
unsigned int hard_cur_sectors;
@ -232,7 +234,15 @@ struct request {
struct bio *biotail;
struct hlist_node hash; /* merge hash */
struct rb_node rb_node; /* sort/lookup */
/*
* The rb_node is only used inside the io scheduler, requests
* are pruned when moved to the dispatch queue. So let the
* completion_data share space with the rb_node.
*/
union {
struct rb_node rb_node; /* sort/lookup */
void *completion_data;
};
/*
* two pointers are available for the IO schedulers, if they need
@ -241,8 +251,6 @@ struct request {
void *elevator_private;
void *elevator_private2;
void *completion_data;
struct gendisk *rq_disk;
unsigned long start_time;
@ -260,8 +268,6 @@ struct request {
unsigned short ioprio;
request_queue_t *q;
void *special;
char *buffer;