[PATCH 40/45] block: move bio io prio to a new field

mchristi
2016-06-05T19:34:06Z

In the next patch, we move drop the compat code and make
the op a separate value that is hidden in bi_rw. To give
the op and rq bits flags room to grow this moves prio to
its own field.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
include/linux/bio.h | 14 ++------------
include/linux/blk_types.h | 5 ++---
2 files changed, 4 insertions(+), 15 deletions(-)

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 4568647..35108c2 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -47,18 +47,8 @@
#define bio_op(bio) (op_from_rq_bits((bio)->bi_rw))
#define bio_set_op_attrs(bio, op, flags) ((bio)->bi_rw |= (op | flags))

-/*
- * 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)
+#define bio_prio(bio) (bio)->bi_ioprio
+#define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio)

/*
* various member access, note that bio_data should of course not be used
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 6e60baa..2738413 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -48,9 +48,8 @@ struct bio {
struct block_device *bi_bdev;
unsigned int bi_flags; /* status, command, etc */
int bi_error;
- unsigned long bi_rw; /* bottom bits READ/WRITE,
- * top bits priority
- */
+ unsigned long bi_rw; /* READ/WRITE */
+ unsigned short bi_ioprio;

struct bvec_iter bi_iter;