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-rw-r--r--include/linux/bio.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 038022763f0..36ef29fa0d8 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
*/