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block: move bio list helpers into bio.h

Browse source 
It's used by DM and MD and generally useful, so move the bio list
helpers into bio.h.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Christoph Hellwig 2009-04-07 19:55:13 +02:00 committed by Jens Axboe
parent 0882e8dd3a
commit 8f3d8ba20e
10 changed files with 109 additions and 126 deletions
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117
drivers/md/dm-bio-list.h
View file

@ -1,117 +0,0 @@
/*
* Copyright (C) 2004 Red Hat UK Ltd.
*
* This file is released under the GPL.
*/
#ifndef DM_BIO_LIST_H
#define DM_BIO_LIST_H
#include <linux/bio.h>
#ifdef CONFIG_BLOCK
struct bio_list {
struct bio *head;
struct bio *tail;
};
static inline int bio_list_empty(const struct bio_list *bl)
{
return bl->head == NULL;
}
static inline void bio_list_init(struct bio_list *bl)
{
bl->head = bl->tail = NULL;
}
#define bio_list_for_each(bio, bl) \
for (bio = (bl)->head; bio; bio = bio->bi_next)
static inline unsigned bio_list_size(const struct bio_list *bl)
{
unsigned sz = 0;
struct bio *bio;
bio_list_for_each(bio, bl)
sz++;
return sz;
}
static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
{
bio->bi_next = NULL;
if (bl->tail)
bl->tail->bi_next = bio;
else
bl->head = bio;
bl->tail = bio;
}
static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
{
bio->bi_next = bl->head;
bl->head = bio;
if (!bl->tail)
bl->tail = bio;
}
static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
{
if (!bl2->head)
return;
if (bl->tail)
bl->tail->bi_next = bl2->head;
else
bl->head = bl2->head;
bl->tail = bl2->tail;
}
static inline void bio_list_merge_head(struct bio_list *bl,
struct bio_list *bl2)
{
if (!bl2->head)
return;
if (bl->head)
bl2->tail->bi_next = bl->head;
else
bl->tail = bl2->tail;
bl->head = bl2->head;
}
static inline struct bio *bio_list_pop(struct bio_list *bl)
{
struct bio *bio = bl->head;
if (bio) {
bl->head = bl->head->bi_next;
if (!bl->head)
bl->tail = NULL;
bio->bi_next = NULL;
}
return bio;
}
static inline struct bio *bio_list_get(struct bio_list *bl)
{
struct bio *bio = bl->head;
bl->head = bl->tail = NULL;
return bio;
}
#endif /* CONFIG_BLOCK */
#endif

2
drivers/md/dm-delay.c
View file

@ -15,8 +15,6 @@
#include <linux/device-mapper.h>
#include "dm-bio-list.h"
#define DM_MSG_PREFIX "delay"
struct delay_c {

1
drivers/md/dm-mpath.c
View file

@ -8,7 +8,6 @@
#include <linux/device-mapper.h>
#include "dm-path-selector.h"
#include "dm-bio-list.h"
#include "dm-bio-record.h"
#include "dm-uevent.h"

1
drivers/md/dm-raid1.c
View file

@ -5,7 +5,6 @@
* This file is released under the GPL.
*/
#include "dm-bio-list.h"
#include "dm-bio-record.h"
#include <linux/init.h>

1
drivers/md/dm-region-hash.c
View file

@ -14,7 +14,6 @@
#include <linux/vmalloc.h>
#include "dm.h"
#include "dm-bio-list.h"
#define DM_MSG_PREFIX "region hash"

1
drivers/md/dm-snap.c
View file

@ -22,7 +22,6 @@
#include <linux/workqueue.h>
#include "dm-exception-store.h"
#include "dm-bio-list.h"
#define DM_MSG_PREFIX "snapshots"

1
drivers/md/dm.c
View file

@ -6,7 +6,6 @@
*/
#include "dm.h"
#include "dm-bio-list.h"
#include "dm-uevent.h"
#include <linux/init.h>

1
drivers/md/raid1.c
View file

@ -35,7 +35,6 @@
#include <linux/blkdev.h>
#include <linux/seq_file.h>
#include "md.h"
#include "dm-bio-list.h"
#include "raid1.h"
#include "bitmap.h"

1
drivers/md/raid10.c
View file

@ -22,7 +22,6 @@
#include <linux/blkdev.h>
#include <linux/seq_file.h>
#include "md.h"
#include "dm-bio-list.h"
#include "raid10.h"
#include "bitmap.h"

109
include/linux/bio.h
View file

@ -504,6 +504,115 @@ static inline int bio_has_data(struct bio *bio)
return bio && bio->bi_io_vec != NULL;
}
/*
* BIO list managment for use by remapping drivers (e.g. DM or MD).
*
* A bio_list anchors a singly-linked list of bios chained through the bi_next
* member of the bio. The bio_list also caches the last list member to allow
* fast access to the tail.
*/
struct bio_list {
struct bio *head;
struct bio *tail;
};
static inline int bio_list_empty(const struct bio_list *bl)
{
return bl->head == NULL;
}
static inline void bio_list_init(struct bio_list *bl)
{
bl->head = bl->tail = NULL;
}
#define bio_list_for_each(bio, bl) \
for (bio = (bl)->head; bio; bio = bio->bi_next)
static inline unsigned bio_list_size(const struct bio_list *bl)
{
unsigned sz = 0;
struct bio *bio;
bio_list_for_each(bio, bl)
sz++;
return sz;
}
static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
{
bio->bi_next = NULL;
if (bl->tail)
bl->tail->bi_next = bio;
else
bl->head = bio;
bl->tail = bio;
}
static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
{
bio->bi_next = bl->head;
bl->head = bio;
if (!bl->tail)
bl->tail = bio;
}
static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
{
if (!bl2->head)
return;
if (bl->tail)
bl->tail->bi_next = bl2->head;
else
bl->head = bl2->head;
bl->tail = bl2->tail;
}
static inline void bio_list_merge_head(struct bio_list *bl,
struct bio_list *bl2)
{
if (!bl2->head)
return;
if (bl->head)
bl2->tail->bi_next = bl->head;
else
bl->tail = bl2->tail;
bl->head = bl2->head;
}
static inline struct bio *bio_list_pop(struct bio_list *bl)
{
struct bio *bio = bl->head;
if (bio) {
bl->head = bl->head->bi_next;
if (!bl->head)
bl->tail = NULL;
bio->bi_next = NULL;
}
return bio;
}
static inline struct bio *bio_list_get(struct bio_list *bl)
{
struct bio *bio = bl->head;
bl->head = bl->tail = NULL;
return bio;
}
#if defined(CONFIG_BLK_DEV_INTEGRITY)
#define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)]))