elevator.c File Reference

#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/elevator.h>
#include <linux/bio.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/compiler.h>
#include <linux/blktrace_api.h>
#include <linux/hash.h>
#include <linux/uaccess.h>
#include <trace/events/block.h>
#include "blk.h"
#include "blk-cgroup.h"

Go to the source code of this file.

Macros
#define	ELV_HASH_BLOCK(sec)   ((sec) >> 3)
#define	ELV_HASH_FN(sec)   (hash_long(ELV_HASH_BLOCK((sec)), elv_hash_shift))
#define	ELV_HASH_ENTRIES   (1 << elv_hash_shift)
#define	rq_hash_key(rq)   (blk_rq_pos(rq) + blk_rq_sectors(rq))
#define	to_elv(atr)   container_of((atr), struct elv_fs_entry, attr)

Functions
bool	elv_rq_merge_ok (struct request *rq, struct bio *bio)
	EXPORT_SYMBOL (elv_rq_merge_ok)
	__setup ("elevator=", elevator_setup)
int	elevator_init (struct request_queue *q, char *name)
	EXPORT_SYMBOL (elevator_init)
void	elevator_exit (struct elevator_queue *e)
	EXPORT_SYMBOL (elevator_exit)
void	elv_rb_add (struct rb_root *root, struct request *rq)
	EXPORT_SYMBOL (elv_rb_add)
void	elv_rb_del (struct rb_root *root, struct request *rq)
	EXPORT_SYMBOL (elv_rb_del)
struct request *	elv_rb_find (struct rb_root *root, sector_t sector)
	EXPORT_SYMBOL (elv_rb_find)
void	elv_dispatch_sort (struct request_queue *q, struct request *rq)
	EXPORT_SYMBOL (elv_dispatch_sort)
void	elv_dispatch_add_tail (struct request_queue *q, struct request *rq)
	EXPORT_SYMBOL (elv_dispatch_add_tail)
int	elv_merge (struct request_queue *q, struct request **req, struct bio *bio)
void	elv_merged_request (struct request_queue *q, struct request *rq, int type)
void	elv_merge_requests (struct request_queue *q, struct request *rq, struct request *next)
void	elv_bio_merged (struct request_queue *q, struct request *rq, struct bio *bio)
void	elv_requeue_request (struct request_queue *q, struct request *rq)
void	elv_drain_elevator (struct request_queue *q)
void	__elv_add_request (struct request_queue *q, struct request *rq, int where)
	EXPORT_SYMBOL (__elv_add_request)
void	elv_add_request (struct request_queue *q, struct request *rq, int where)
	EXPORT_SYMBOL (elv_add_request)
struct request *	elv_latter_request (struct request_queue *q, struct request *rq)
struct request *	elv_former_request (struct request_queue *q, struct request *rq)
int	elv_set_request (struct request_queue *q, struct request *rq, struct bio *bio, gfp_t gfp_mask)
void	elv_put_request (struct request_queue *q, struct request *rq)
int	elv_may_queue (struct request_queue *q, int rw)
void	elv_abort_queue (struct request_queue *q)
	EXPORT_SYMBOL (elv_abort_queue)
void	elv_completed_request (struct request_queue *q, struct request *rq)
int	elv_register_queue (struct request_queue *q)
	EXPORT_SYMBOL (elv_register_queue)
void	elv_unregister_queue (struct request_queue *q)
	EXPORT_SYMBOL (elv_unregister_queue)
int	elv_register (struct elevator_type *e)
	EXPORT_SYMBOL_GPL (elv_register)
void	elv_unregister (struct elevator_type *e)
	EXPORT_SYMBOL_GPL (elv_unregister)
int	elevator_change (struct request_queue *q, const char *name)
	EXPORT_SYMBOL (elevator_change)
ssize_t	elv_iosched_store (struct request_queue *q, const char *name, size_t count)
ssize_t	elv_iosched_show (struct request_queue *q, char *name)
struct request *	elv_rb_former_request (struct request_queue *q, struct request *rq)
	EXPORT_SYMBOL (elv_rb_former_request)
struct request *	elv_rb_latter_request (struct request_queue *q, struct request *rq)
	EXPORT_SYMBOL (elv_rb_latter_request)

Macro Definition Documentation

#define ELV_HASH_BLOCK

(

sec

)

((sec) >> 3)

Definition at line 50 of file elevator.c.

#define ELV_HASH_ENTRIES   (1 << elv_hash_shift)

Definition at line 53 of file elevator.c.

#define ELV_HASH_FN

(

sec

)

(hash_long(ELV_HASH_BLOCK((sec)), elv_hash_shift))

Definition at line 51 of file elevator.c.

#define rq_hash_key

(

rq

)

(blk_rq_pos(rq) + blk_rq_sectors(rq))

Definition at line 54 of file elevator.c.

#define to_elv

(

atr

)

container_of((atr), struct elv_fs_entry, attr)

Definition at line 727 of file elevator.c.

Function Documentation

void __elv_add_request	(	struct request_queue *	q,
		struct request *	rq,
		int	where
	)

Definition at line 557 of file elevator.c.

__setup

(

)

int elevator_change	(	struct request_queue *	q,
		const char *	name
	)

Definition at line 937 of file elevator.c.

void elevator_exit

(

struct elevator_queue *

e

)

Definition at line 230 of file elevator.c.

int elevator_init	(	struct request_queue *	q,
		char *	name
	)

Definition at line 180 of file elevator.c.

void elv_abort_queue

(

struct request_queue *

q

)

Definition at line 692 of file elevator.c.

void elv_add_request	(	struct request_queue *	q,
		struct request *	rq,
		int	where
	)

Definition at line 636 of file elevator.c.

void elv_bio_merged	(	struct request_queue *	q,
		struct request *	rq,
		struct bio *	bio
	)

Definition at line 516 of file elevator.c.

void elv_completed_request	(	struct request_queue *	q,
		struct request *	rq
	)

Definition at line 712 of file elevator.c.

void elv_dispatch_add_tail	(	struct request_queue *	q,
		struct request *	rq
	)

Definition at line 391 of file elevator.c.

void elv_dispatch_sort	(	struct request_queue *	q,
		struct request *	rq
	)

Definition at line 346 of file elevator.c.

void elv_drain_elevator

(

struct request_queue *

q

)

Definition at line 542 of file elevator.c.

struct request* elv_former_request ( struct request_queue *  q, struct request *  rq  )

read

Definition at line 655 of file elevator.c.

ssize_t elv_iosched_show	(	struct request_queue *	q,
		char *	name
	)

Definition at line 977 of file elevator.c.

ssize_t elv_iosched_store	(	struct request_queue *	q,
		const char *	name,
		size_t	count
	)

Definition at line 961 of file elevator.c.

struct request* elv_latter_request ( struct request_queue *  q, struct request *  rq  )

read

Definition at line 646 of file elevator.c.

int elv_may_queue	(	struct request_queue *	q,
		int	rw
	)

Definition at line 682 of file elevator.c.

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

Definition at line 406 of file elevator.c.

void elv_merge_requests	(	struct request_queue *	q,
		struct request *	rq,
		struct request *	next
	)

Definition at line 497 of file elevator.c.

void elv_merged_request	(	struct request_queue *	q,
		struct request *	rq,
		int	type
	)

Definition at line 484 of file elevator.c.

void elv_put_request	(	struct request_queue *	q,
		struct request *	rq
	)

Definition at line 674 of file elevator.c.

void elv_rb_add	(	struct rb_root *	root,
		struct request *	rq
	)

Definition at line 292 of file elevator.c.

void elv_rb_del	(	struct rb_root *	root,
		struct request *	rq
	)

Definition at line 313 of file elevator.c.

struct request* elv_rb_find ( struct rb_root *  root, sector_t  sector  )

read

Definition at line 321 of file elevator.c.

struct request* elv_rb_former_request ( struct request_queue *  q, struct request *  rq  )

read

Definition at line 1002 of file elevator.c.

struct request* elv_rb_latter_request ( struct request_queue *  q, struct request *  rq  )

read

Definition at line 1014 of file elevator.c.

int elv_register

(

struct elevator_type *

e

)

Definition at line 808 of file elevator.c.

int elv_register_queue

(

struct request_queue *

q

)

Definition at line 774 of file elevator.c.

void elv_requeue_request	(	struct request_queue *	q,
		struct request *	rq
	)

Definition at line 525 of file elevator.c.

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

Definition at line 74 of file elevator.c.

int elv_set_request	(	struct request_queue *	q,
		struct request *	rq,
		struct bio *	bio,
		gfp_t	gfp_mask
	)

Definition at line 664 of file elevator.c.

void elv_unregister

(

struct elevator_type *

e

)

Definition at line 849 of file elevator.c.

void elv_unregister_queue

(

struct request_queue *

q

)

Definition at line 796 of file elevator.c.

EXPORT_SYMBOL

(

elv_rq_merge_ok

)

EXPORT_SYMBOL

(

elevator_init

)

EXPORT_SYMBOL

(

elevator_exit

)

EXPORT_SYMBOL

(

elv_rb_add

)

EXPORT_SYMBOL

(

elv_rb_del

)

EXPORT_SYMBOL

(

elv_rb_find

)

EXPORT_SYMBOL

(

elv_dispatch_sort

)

EXPORT_SYMBOL

(

elv_dispatch_add_tail

)

EXPORT_SYMBOL

(

__elv_add_request

)

EXPORT_SYMBOL

(

elv_add_request

)

EXPORT_SYMBOL

(

elv_abort_queue

)

EXPORT_SYMBOL

(

elv_register_queue

)

EXPORT_SYMBOL

(

elv_unregister_queue

)

EXPORT_SYMBOL

(

elevator_change

)

EXPORT_SYMBOL

(

elv_rb_former_request

)

EXPORT_SYMBOL

(

elv_rb_latter_request

)

EXPORT_SYMBOL_GPL

(

elv_register

)

EXPORT_SYMBOL_GPL

(

elv_unregister

)