blk-merge.c File Reference

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/scatterlist.h>
#include "blk.h"

Go to the source code of this file.

Functions
void	blk_recalc_rq_segments (struct request *rq)
void	blk_recount_segments (struct request_queue *q, struct bio *bio)
	EXPORT_SYMBOL (blk_recount_segments)
int	blk_rq_map_sg (struct request_queue *q, struct request *rq, struct scatterlist *sglist)
	EXPORT_SYMBOL (blk_rq_map_sg)
int	blk_bio_map_sg (struct request_queue *q, struct bio *bio, struct scatterlist *sglist)
	EXPORT_SYMBOL (blk_bio_map_sg)
int	ll_back_merge_fn (struct request_queue *q, struct request *req, struct bio *bio)
int	ll_front_merge_fn (struct request_queue *q, struct request *req, struct bio *bio)
void	blk_rq_set_mixed_merge (struct request *rq)
int	attempt_back_merge (struct request_queue *q, struct request *rq)
int	attempt_front_merge (struct request_queue *q, struct request *rq)
int	blk_attempt_req_merge (struct request_queue *q, struct request *rq, struct request *next)
bool	blk_rq_merge_ok (struct request *rq, struct bio *bio)
int	blk_try_merge (struct request *rq, struct bio *bio)

Function Documentation

int attempt_back_merge	(	struct request_queue *	q,
		struct request *	rq
	)

Definition at line 479 of file blk-merge.c.

int attempt_front_merge	(	struct request_queue *	q,
		struct request *	rq
	)

Definition at line 489 of file blk-merge.c.

int blk_attempt_req_merge	(	struct request_queue *	q,
		struct request *	rq,
		struct request *	next
	)

Definition at line 499 of file blk-merge.c.

int blk_bio_map_sg	(	struct request_queue *	q,
		struct bio *	bio,
		struct scatterlist *	sglist
	)

blk_bio_map_sg - map a bio to a scatterlist : request_queue in question : bio being mapped : scatterlist being mapped

Note: Caller must make sure sg can hold bio->bi_phys_segments entries

Will return the number of sg entries setup

Definition at line 223 of file blk-merge.c.

void blk_recalc_rq_segments

(

struct request *

rq

)

Definition at line 71 of file blk-merge.c.

void blk_recount_segments	(	struct request_queue *	q,
		struct bio *	bio
	)

Definition at line 76 of file blk-merge.c.

int blk_rq_map_sg	(	struct request_queue *	q,
		struct request *	rq,
		struct scatterlist *	sglist
	)

Definition at line 160 of file blk-merge.c.

bool blk_rq_merge_ok	(	struct request *	rq,
		struct bio *	bio
	)

Definition at line 505 of file blk-merge.c.

void blk_rq_set_mixed_merge

(

struct request *

rq

)

blk_rq_set_mixed_merge - mark a request as mixed merge : request to mark as mixed merge

Description: is about to be mixed merged. Make sure the attributes which can be mixed are set in each bio and mark as mixed merged.

Definition at line 361 of file blk-merge.c.

int blk_try_merge	(	struct request *	rq,
		struct bio *	bio
	)

Definition at line 533 of file blk-merge.c.

EXPORT_SYMBOL

(

blk_recount_segments

)

EXPORT_SYMBOL

(

blk_rq_map_sg

)

EXPORT_SYMBOL

(

blk_bio_map_sg

)

int ll_back_merge_fn	(	struct request_queue *	q,
		struct request *	req,
		struct bio *	bio
	)

Definition at line 275 of file blk-merge.c.

int ll_front_merge_fn	(	struct request_queue *	q,
		struct request *	req,
		struct bio *	bio
	)

Definition at line 293 of file blk-merge.c.