1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/bio.h b/include/linux/bio.h
index ec48bac5b039..060ff695085c 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -218,6 +218,7 @@ struct bio_pair {
 };
 extern struct bio_pair *bio_split(struct bio *bi, int first_sectors);
 extern void bio_pair_release(struct bio_pair *dbio);
+extern void bio_trim(struct bio *bio, int offset, int size);
 
 extern struct bio_set *bioset_create(unsigned int, unsigned int);
 extern void bioset_free(struct bio_set *);
@@ -419,6 +420,8 @@ static inline void bio_list_init(struct bio_list *bl)
         bl->head = bl->tail = NULL;
 }
 
+#define BIO_EMPTY_LIST  { NULL, NULL }
+
 #define bio_list_for_each(bio, bl) \
         for (bio = (bl)->head; bio; bio = bio->bi_next)