Linux-libre 4.7.1-gnupck-4.7.1-gnu

1 files changed, 11 insertions, 0 deletions

diff --git a/include/linux/bio.h b/include/linux/bio.h
index fe5f247d0..8e69cfa34 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -705,6 +705,17 @@ static inline struct bio *bio_list_get(struct bio_list *bl)
 }
 
 /*
+ * Increment chain count for the bio. Make sure the CHAIN flag update
+ * is visible before the raised count.
+ */
+static inline void bio_inc_remaining(struct bio *bio)
+{
+	bio_set_flag(bio, BIO_CHAIN);
+	smp_mb__before_atomic();
+	atomic_inc(&bio->__bi_remaining);
+}
+
+/*
  * bio_set is used to allow other portions of the IO system to
  * allocate their own private memory pools for bio and iovec structures.
  * These memory pools in turn all allocate from the bio_slab