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[PATCH] 01/05 Implement generic dispatch queue

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Implements generic dispatch queue which can replace all
dispatch queues implemented by each iosched.  This reduces
code duplication, eases enforcing semantics over dispatch
queue, and simplifies specific ioscheds.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Tejun Heo 2005-10-20 16:23:44 +02:00 • committed by Jens Axboe
parent 2824bc9328
commit 8922e16cf6
4 changed files with 202 additions and 98 deletions
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17
include/linux/blkdev.h
View file

@ -203,6 +203,7 @@ struct request {
enum rq_flag_bits {
__REQ_RW, /* not set, read. set, write */
__REQ_FAILFAST, /* no low level driver retries */
__REQ_SORTED, /* elevator knows about this request */
__REQ_SOFTBARRIER, /* may not be passed by ioscheduler */
__REQ_HARDBARRIER, /* may not be passed by drive either */
__REQ_CMD, /* is a regular fs rw request */
@ -235,6 +236,7 @@ enum rq_flag_bits {
#define REQ_RW (1 << __REQ_RW)
#define REQ_FAILFAST (1 << __REQ_FAILFAST)
#define REQ_SORTED (1 << __REQ_SORTED)
#define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER)
#define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER)
#define REQ_CMD (1 << __REQ_CMD)
@ -332,6 +334,13 @@ struct request_queue
prepare_flush_fn *prepare_flush_fn;
end_flush_fn *end_flush_fn;
/*
* Dispatch queue sorting
*/
sector_t last_sector;
struct request *boundary_rq;
unsigned int max_back_kb;
/*
* Auto-unplugging state
*/
@ -454,6 +463,7 @@ enum {
#define blk_pm_request(rq) \
((rq)->flags & (REQ_PM_SUSPEND | REQ_PM_RESUME))
#define blk_sorted_rq(rq) ((rq)->flags & REQ_SORTED)
#define blk_barrier_rq(rq) ((rq)->flags & REQ_HARDBARRIER)
#define blk_barrier_preflush(rq) ((rq)->flags & REQ_BAR_PREFLUSH)
#define blk_barrier_postflush(rq) ((rq)->flags & REQ_BAR_POSTFLUSH)
@ -611,12 +621,7 @@ extern void end_request(struct request *req, int uptodate);
static inline void blkdev_dequeue_request(struct request *req)
{
BUG_ON(list_empty(&req->queuelist));
list_del_init(&req->queuelist);
if (req->rl)
elv_remove_request(req->q, req);
elv_dequeue_request(req->q, req);
}
/*