Define get_current_ioprio() as an inline helper to obtain the caller
I/O priority from its task I/O context. Use this helper in
blk_init_request_from_bio() to set a request ioprio.
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Johannes Thumshirn <jthumshirn@xxxxxxx>
Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxx>
---
block/blk-core.c | 6 +-----
include/linux/ioprio.h | 13 +++++++++++++
2 files changed, 14 insertions(+), 5 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 492648c96992..4450d3c08f25 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -813,18 +813,14 @@ unsigned int blk_plug_queued_count(struct request_queue *q)
void blk_init_request_from_bio(struct request *req, struct bio *bio)
{
- struct io_context *ioc = current->io_context;
-
if (bio->bi_opf & REQ_RAHEAD)
req->cmd_flags |= REQ_FAILFAST_MASK;
req->__sector = bio->bi_iter.bi_sector;
if (ioprio_valid(bio_prio(bio)))
req->ioprio = bio_prio(bio);
- else if (ioc)
- req->ioprio = ioc->ioprio;
else
- req->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0);
+ req->ioprio = get_current_ioprio();
req->write_hint = bio->bi_write_hint;
blk_rq_bio_prep(req->q, req, bio);
}
diff --git a/include/linux/ioprio.h b/include/linux/ioprio.h
index 9e30ed6443db..e9bfe6972aed 100644
--- a/include/linux/ioprio.h
+++ b/include/linux/ioprio.h
@@ -70,6 +70,19 @@ static inline int task_nice_ioclass(struct task_struct *task)
return IOPRIO_CLASS_BE;
}
+/*
+ * If the calling process has set an I/O priority, use that. Otherwise, return
+ * the default I/O priority.
+ */
+static inline int get_current_ioprio(void)
+{
+ struct io_context *ioc = current->io_context;
+
+ if (ioc)
+ return ioc->ioprio;
+ return IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0);
+}
+
/*
* For inheritance, return the highest of the two given priorities
*/
--
2.19.1
