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Commit abae1fde authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by Jens Axboe
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add a struct request pointer to the request structure 



This adds a struct request pointer to the request structure for the
second data phase (bidi for now). A request queue supporting bidi
requests sets QUEUE_FLAG_BIDI. This prevents sending bidi requests to
a non-bidi queue.

Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent efba1a31

block/ll_rw_blk.c

+1 −0
Original line number Diff line number Diff line
@@ -256,6 +256,7 @@ static void rq_init(request_queue_t *q, struct request *rq) 
	rq->end_io = NULL;

	rq->end_io_data = NULL;

	rq->completion_data = NULL;

	rq->next_rq = NULL;

}



/**

include/linux/blkdev.h

+5 −0
Original line number Diff line number Diff line
@@ -317,6 +317,9 @@ struct request { 
	 */

	rq_end_io_fn *end_io;

	void *end_io_data;



	/* for bidi */

	struct request *next_rq;

};



/*
@@ -486,6 +489,7 @@ struct request_queue 
#define QUEUE_FLAG_REENTER	6	/* Re-entrancy avoidance */

#define QUEUE_FLAG_PLUGGED	7	/* queue is plugged */

#define QUEUE_FLAG_ELVSWITCH	8	/* don't use elevator, just do FIFO */

#define QUEUE_FLAG_BIDI		9	/* queue supports bidi requests */



enum {

	/*
@@ -550,6 +554,7 @@ enum { 
#define blk_sorted_rq(rq)	((rq)->cmd_flags & REQ_SORTED)

#define blk_barrier_rq(rq)	((rq)->cmd_flags & REQ_HARDBARRIER)

#define blk_fua_rq(rq)		((rq)->cmd_flags & REQ_FUA)

#define blk_bidi_rq(rq)		((rq)->next_rq != NULL)



#define list_entry_rq(ptr)	list_entry((ptr), struct request, queuelist)