We map the WRITE_HINT_* life time hints to the internal flags.
Drivers can then, in turn, map those flags to a suitable stream
type.
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
---
block/bio.c | 16 ++++++++++++++++
include/linux/bio.h | 1 +
include/linux/blk_types.h | 5 +++++
3 files changed, 22 insertions(+)
diff --git a/block/bio.c b/block/bio.c
index 888e7801c638..758d83d91bb0 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -2082,6 +2082,22 @@ void bio_clone_blkcg_association(struct bio *dst, struct bio *src)
#endif /* CONFIG_BLK_CGROUP */
+static const unsigned int rwf_write_to_opf_flag[] = {
+ 0, REQ_WRITE_SHORT, REQ_WRITE_MEDIUM, REQ_WRITE_LONG, REQ_WRITE_EXTREME
+};
+
+/*
+ * Convert WRITE_LIFE_* hints into req/bio flags
+ */
+unsigned int bio_op_write_hint(enum write_hint hint)
+{
+ if (WARN_ON_ONCE(hint >= ARRAY_SIZE(rwf_write_to_opf_flag)))
+ return 0;
+
+ return rwf_write_to_opf_flag[hint];
+}
+EXPORT_SYMBOL_GPL(bio_op_write_hint);
+
static void __init biovec_init_slabs(void)
{
int i;
diff --git a/include/linux/bio.h b/include/linux/bio.h
index d1b04b0e99cf..e9360dc5ea07 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -443,6 +443,7 @@ extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int,
gfp_t, int);
extern void bio_set_pages_dirty(struct bio *bio);
extern void bio_check_pages_dirty(struct bio *bio);
+extern unsigned int bio_op_write_hint(enum write_hint hint);
void generic_start_io_acct(int rw, unsigned long sectors,
struct hd_struct *part);
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 57d1eb530799..23646eb433e7 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -323,4 +323,9 @@ struct blk_rq_stat {
u64 batch;
};
+static inline bool op_write_hint_valid(unsigned int opf)
+{
+ return (opf & REQ_WRITE_LIFE_MASK) != 0;
+}
+
#endif /* __LINUX_BLK_TYPES_H */
--
2.7.4
