X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fmd%2Fdm-bio-list.h;h=3f7b827649e3d5ceeb93c1e4d51a5290b4dce933;hb=2123a09f3f129f4d56f59026ec63e5990f86db2f;hp=bbf4615f0e30d792990208325fa9fa48580ce879;hpb=97f2aab6698f3ab2552c41c1024a65ffd0763a6d;p=linux-2.6

diff --git a/drivers/md/dm-bio-list.h b/drivers/md/dm-bio-list.h
index bbf4615f0e..3f7b827649 100644
--- a/drivers/md/dm-bio-list.h
+++ b/drivers/md/dm-bio-list.h
@@ -9,16 +9,42 @@
 
 #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;
+}
+
+#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; 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;
@@ -44,6 +70,20 @@ static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
 	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;
@@ -68,4 +108,5 @@ static inline struct bio *bio_list_get(struct bio_list *bl)
 	return bio;
 }
 
+#endif /* CONFIG_BLOCK */
 #endif