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Date: Tue, 7 Apr 2009 18:20:14 +0200
From: Christoph Hellwig <hch@....de>
To: axboe@...nel.dk, neilb@...e.de, agk@...hat.com
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH]
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@....de>
Index: linux-2.6/drivers/md/dm-bio-list.h
===================================================================
--- linux-2.6.orig/drivers/md/dm-bio-list.h 2009-04-05 13:10:25.427445349 +0200
+++ /dev/null 1970-01-01 00:00:00.000000000 +0000
@@ -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
Index: linux-2.6/drivers/md/dm-delay.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-delay.c 2009-04-05 13:13:29.222444720 +0200
+++ linux-2.6/drivers/md/dm-delay.c 2009-04-05 13:13:32.398573159 +0200
@@ -15,8 +15,6 @@
#include <linux/device-mapper.h>
-#include "dm-bio-list.h"
-
#define DM_MSG_PREFIX "delay"
struct delay_c {
Index: linux-2.6/drivers/md/dm-mpath.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-mpath.c 2009-04-05 13:13:29.242444961 +0200
+++ linux-2.6/drivers/md/dm-mpath.c 2009-04-05 13:13:57.017458602 +0200
@@ -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"
Index: linux-2.6/drivers/md/dm-raid1.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-raid1.c 2009-04-05 13:13:29.255452134 +0200
+++ linux-2.6/drivers/md/dm-raid1.c 2009-04-05 13:13:38.802447942 +0200
@@ -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>
Index: linux-2.6/drivers/md/dm-region-hash.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-region-hash.c 2009-04-05 13:13:29.270445034 +0200
+++ linux-2.6/drivers/md/dm-region-hash.c 2009-04-05 13:13:41.473449954 +0200
@@ -14,7 +14,6 @@
#include <linux/vmalloc.h>
#include "dm.h"
-#include "dm-bio-list.h"
#define DM_MSG_PREFIX "region hash"
Index: linux-2.6/drivers/md/dm-snap.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-snap.c 2009-04-05 13:13:29.287445452 +0200
+++ linux-2.6/drivers/md/dm-snap.c 2009-04-05 13:13:43.704446877 +0200
@@ -22,7 +22,6 @@
#include <linux/workqueue.h>
#include "dm-exception-store.h"
-#include "dm-bio-list.h"
#define DM_MSG_PREFIX "snapshots"
Index: linux-2.6/drivers/md/dm.c
===================================================================
--- linux-2.6.orig/drivers/md/dm.c 2009-04-05 13:13:29.300444453 +0200
+++ linux-2.6/drivers/md/dm.c 2009-04-05 13:13:45.999446772 +0200
@@ -6,7 +6,6 @@
*/
#include "dm.h"
-#include "dm-bio-list.h"
#include "dm-uevent.h"
#include <linux/init.h>
Index: linux-2.6/drivers/md/raid1.c
===================================================================
--- linux-2.6.orig/drivers/md/raid1.c 2009-04-05 13:13:29.316444814 +0200
+++ linux-2.6/drivers/md/raid1.c 2009-04-05 13:13:49.188479487 +0200
@@ -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"
Index: linux-2.6/drivers/md/raid10.c
===================================================================
--- linux-2.6.orig/drivers/md/raid10.c 2009-04-05 13:13:29.332445594 +0200
+++ linux-2.6/drivers/md/raid10.c 2009-04-05 13:13:52.435605187 +0200
@@ -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"
Index: linux-2.6/include/linux/bio.h
===================================================================
--- linux-2.6.orig/include/linux/bio.h 2009-04-05 13:10:25.442444604 +0200
+++ linux-2.6/include/linux/bio.h 2009-04-05 13:12:47.685574569 +0200
@@ -501,6 +501,115 @@ static inline int bio_has_data(struct bi
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)]))
--
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