block: move bio list helpers into bio.h

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>

diff --git a/drivers/md/dm-bio-list.h b/drivers/md/dm-bio-list.h
deleted file mode 100644 (file)
index 345098b..0000000
--- a/drivers/md/dm-bio-list.h
+++ /dev/null
@@ -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

diff --git a/drivers/md/dm-delay.c b/drivers/md/dm-delay.c
index 59ee1b0..559dbb5 100644 (file)
--- a/drivers/md/dm-delay.c
+++ b/drivers/md/dm-delay.c
@@ -15,8 +15,6 @@
 
 #include <linux/device-mapper.h>
 
-#include "dm-bio-list.h"
-
 #define DM_MSG_PREFIX "delay"
 
 struct delay_c {

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 095f77b..6a386ab 100644 (file)
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -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"
 

diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 536ef0b..076fbb4 100644 (file)
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -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>

diff --git a/drivers/md/dm-region-hash.c b/drivers/md/dm-region-hash.c
index 59f8d9d..7b899be 100644 (file)
--- a/drivers/md/dm-region-hash.c
+++ b/drivers/md/dm-region-hash.c
@@ -14,7 +14,6 @@
 #include <linux/vmalloc.h>
 
 #include "dm.h"
-#include "dm-bio-list.h"
 
 #define        DM_MSG_PREFIX   "region hash"
 

diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 981a041..d73f17f 100644 (file)
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -22,7 +22,6 @@
 #include <linux/workqueue.h>
 
 #include "dm-exception-store.h"
-#include "dm-bio-list.h"
 
 #define DM_MSG_PREFIX "snapshots"
 

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 8a994be..424f7b0 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -6,7 +6,6 @@
  */
 
 #include "dm.h"
-#include "dm-bio-list.h"
 #include "dm-uevent.h"
 
 #include <linux/init.h>

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 274b491..36df910 100644 (file)
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -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"
 

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index e293d92..81a54f1 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -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"
 

diff --git a/include/linux/bio.h b/include/linux/bio.h
index b900d2c..b89cf2d 100644 (file)
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -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)]))