X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=include%2Flinux%2Fbio.h;h=9faebf7f9a33c04a73506e7e379432ce1cce93bf;hb=f89eae4ee7e075e576bd4b4d2db901023421a3be;hp=6b7481f62218895945ba6dcd1b7df2e49268d552;hpb=b340941af9d85ca74d3efacb7210e95296c484aa;p=deliverable%2Flinux.git

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 6b7481f62218..9faebf7f9a33 100644
--- 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.