Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[deliverable/linux.git] / include / linux / bio.h

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 6b7481f62218895945ba6dcd1b7df2e49268d552..9faebf7f9a33c04a73506e7e379432ce1cce93bf 100644 (file)
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -702,6 +702,17 @@ static inline struct bio *bio_list_get(struct bio_list *bl)
        return bio;
 }
 
+/*
+ * 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.