[PATCH v2 2/2] block: Add iocontext priority to request

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Patch adds an association between iocontext ioprio and the ioprio of
a request. This feature is only enabled if a queue flag is set to
indicate that requests should have ioprio associated with them. The
queue flag is exposed as the req_prio queue sysfs entry.

Signed-off-by: Adam Mananzanares <adam.manzanares@xxxxxxxx>
---
 block/blk-core.c       |  8 +++++++-
 block/blk-sysfs.c      | 32 ++++++++++++++++++++++++++++++++
 include/linux/blkdev.h |  2 ++
 3 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 36c7ac3..17c3ce5 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -33,6 +33,7 @@
 #include <linux/ratelimit.h>
 #include <linux/pm_runtime.h>
 #include <linux/blk-cgroup.h>
+#include <linux/ioprio.h>
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/block.h>
@@ -1648,6 +1649,7 @@ out:
 
 void init_request_from_bio(struct request *req, struct bio *bio)
 {
+	struct io_context *ioc = rq_ioc(bio);
 	req->cmd_type = REQ_TYPE_FS;
 
 	req->cmd_flags |= bio->bi_opf & REQ_COMMON_MASK;
@@ -1656,7 +1658,11 @@ void init_request_from_bio(struct request *req, struct bio *bio)
 
 	req->errors = 0;
 	req->__sector = bio->bi_iter.bi_sector;
-	req->ioprio = bio_prio(bio);
+	if (blk_queue_req_prio(req->q))
+		req->ioprio = ioprio_best(bio_prio(bio), ioc->ioprio);
+	else
+		req->ioprio = bio_prio(bio);
+
 	blk_rq_bio_prep(req->q, req, bio);
 }
 
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index f87a7e7..268a71a 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -384,6 +384,31 @@ static ssize_t queue_dax_show(struct request_queue *q, char *page)
 	return queue_var_show(blk_queue_dax(q), page);
 }
 
+static ssize_t queue_req_prio_show(struct request_queue *q, char *page)
+{
+	return queue_var_show(blk_queue_req_prio(q), page);
+}
+
+static ssize_t queue_req_prio_store(struct request_queue *q, const char *page,
+				    size_t count)
+{
+	unsigned long req_prio_on;
+	ssize_t ret;
+
+	ret = queue_var_store(&req_prio_on, page, count);
+	if (ret < 0)
+		return ret;
+
+	spin_lock_irq(q->queue_lock);
+	if (req_prio_on)
+		queue_flag_set(QUEUE_FLAG_REQ_PRIO, q);
+	else
+		queue_flag_clear(QUEUE_FLAG_REQ_PRIO, q);
+	spin_unlock_irq(q->queue_lock);
+
+	return ret;
+}
+
 static struct queue_sysfs_entry queue_requests_entry = {
 	.attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
 	.show = queue_requests_show,
@@ -526,6 +551,12 @@ static struct queue_sysfs_entry queue_dax_entry = {
 	.show = queue_dax_show,
 };
 
+static struct queue_sysfs_entry queue_req_prio_entry = {
+	.attr = {.name = "req_prio", .mode = S_IRUGO | S_IWUSR },
+	.show = queue_req_prio_show,
+	.store = queue_req_prio_store,
+};
+
 static struct attribute *default_attrs[] = {
 	&queue_requests_entry.attr,
 	&queue_ra_entry.attr,
@@ -553,6 +584,7 @@ static struct attribute *default_attrs[] = {
 	&queue_poll_entry.attr,
 	&queue_wc_entry.attr,
 	&queue_dax_entry.attr,
+	&queue_req_prio_entry.attr,
 	NULL,
 };
 
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index e79055c..23e1e2d 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -505,6 +505,7 @@ struct request_queue {
 #define QUEUE_FLAG_FUA	       24	/* device supports FUA writes */
 #define QUEUE_FLAG_FLUSH_NQ    25	/* flush not queueuable */
 #define QUEUE_FLAG_DAX         26	/* device supports DAX */
+#define QUEUE_FLAG_REQ_PRIO    27	/* Use iocontext ioprio */
 
 #define QUEUE_FLAG_DEFAULT	((1 << QUEUE_FLAG_IO_STAT) |		\
 				 (1 << QUEUE_FLAG_STACKABLE)	|	\
@@ -595,6 +596,7 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
 #define blk_queue_secure_erase(q) \
 	(test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
 #define blk_queue_dax(q)	test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
+#define blk_queue_req_prio(q)	test_bit(QUEUE_FLAG_REQ_PRIO, &(q)->queue_flags)
 
 #define blk_noretry_request(rq) \
 	((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
-- 
2.1.4

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