X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=drivers%2Fmd%2Fdm-bio-list.h;h=c6be88826fae4d7aaea55ea0f6f8da7bf3b747ee;hb=0ba699347e96b5468b42b3decf1f381abbf99652;hp=da4349649f7f2cd5c7c6d628f40d8bf1a1463b84;hpb=cece901481bafbf14de8cbd3a89ae869ea881055;p=linux-2.6-omap-h63xx.git

diff --git a/drivers/md/dm-bio-list.h b/drivers/md/dm-bio-list.h
index da4349649f7..c6be88826fa 100644
--- a/drivers/md/dm-bio-list.h
+++ b/drivers/md/dm-bio-list.h
@@ -8,17 +8,43 @@
 #define DM_BIO_LIST_H
 
 #include <linux/bio.h>
+#include <linux/prefetch.h>
 
 struct bio_list {
 	struct bio *head;
 	struct bio *tail;
 };
 
+static inline int bio_list_empty(const struct bio_list *bl)
+{
+	return bl->head == NULL;
+}
+
+#define BIO_LIST_INIT { .head = NULL, .tail = NULL }
+
+#define BIO_LIST(bl) \
+	struct bio_list bl = BIO_LIST_INIT
+
 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 && ({ prefetch(bio->bi_next); 1; }); \
+	     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;