1 files changed, 14 insertions, 0 deletions

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 038022763f09..36ef29fa0d8b 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -22,6 +22,7 @@
 
 #include <linux/highmem.h>
 #include <linux/mempool.h>
+#include <linux/ioprio.h>
 
 /* Platforms may set this to teach the BIO layer about IOMMU hardware. */
 #include <asm/io.h>
@@ -150,6 +151,19 @@ struct bio {
 #define BIO_RW_SYNC     4
 
 /*
+ * upper 16 bits of bi_rw define the io priority of this bio
+ */
+#define BIO_PRIO_SHIFT  (8 * sizeof(unsigned long) - IOPRIO_BITS)
+#define bio_prio(bio)   ((bio)->bi_rw >> BIO_PRIO_SHIFT)
+#define bio_prio_valid(bio)     ioprio_valid(bio_prio(bio))
+
+#define bio_set_prio(bio, prio)         do {                    \
+        WARN_ON(prio >= (1 << IOPRIO_BITS));                    \
+        (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1);          \
+        (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT);     \
+} while (0)
+
+/*
  * various member access, note that bio_data should of course not be used
  * on highmem page vectors
  */