diff mbox series

[RFC,V2,1/3] block: add helper of blk_queue_poll

Message ID 20210617103549.930311-2-ming.lei@redhat.com (mailing list archive)
State New, archived
Headers show
Series block/dm: support bio polling | expand

Commit Message

Ming Lei June 17, 2021, 10:35 a.m. UTC 
There has been 3 users, and will be more, so add one such helper.

Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 block/blk-core.c         | 5 ++---
 block/blk-sysfs.c        | 4 ++--
 drivers/nvme/host/core.c | 2 +-
 include/linux/blkdev.h   | 1 +
 4 files changed, 6 insertions(+), 6 deletions(-)

Comments

Christoph Hellwig June 21, 2021, 7:20 a.m. UTC | #1 
On Thu, Jun 17, 2021 at 06:35:47PM +0800, Ming Lei wrote:
> There has been 3 users, and will be more, so add one such helper.
> 
> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
> Reviewed-by: Jeffle Xu <jefflexu@linux.alibaba.com>
> Reviewed-by: Hannes Reinecke <hare@suse.de>
> Signed-off-by: Ming Lei <ming.lei@redhat.com>

I still don't like hiding a simple flag test like this, it just adds
another step to grepping what is going on.
Ming Lei June 21, 2021, 8:38 a.m. UTC | #2 
On Mon, Jun 21, 2021 at 09:20:36AM +0200, Christoph Hellwig wrote:
> On Thu, Jun 17, 2021 at 06:35:47PM +0800, Ming Lei wrote:
> > There has been 3 users, and will be more, so add one such helper.
> > 
> > Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
> > Reviewed-by: Jeffle Xu <jefflexu@linux.alibaba.com>
> > Reviewed-by: Hannes Reinecke <hare@suse.de>
> > Signed-off-by: Ming Lei <ming.lei@redhat.com>
> 
> I still don't like hiding a simple flag test like this, it just adds
> another step to grepping what is going on.

It is actually one pattern in block layer since there is so many such
macros of blk_queue_*. And it makes the check line shorter.


Thanks,
Ming
diff mbox series

Patch

diff --git a/block/blk-core.c b/block/blk-core.c
index 531176578221..1e24c71c6738 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -835,7 +835,7 @@  static noinline_for_stack bool submit_bio_checks(struct bio *bio)
 		}
 	}
 
-	if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
+	if (!blk_queue_poll(q))
 		bio->bi_opf &= ~REQ_POLLED;
 
 	switch (bio_op(bio)) {
@@ -1117,8 +1117,7 @@  int bio_poll(struct bio *bio, unsigned int flags)
 	blk_qc_t cookie = READ_ONCE(bio->bi_cookie);
 	int ret;
 
-	if (cookie == BLK_QC_T_NONE ||
-	    !test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
+	if (cookie == BLK_QC_T_NONE || !blk_queue_poll(q))
 		return 0;
 
 	if (current->plug)
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index f78e73ca6091..93dcf2dfaafd 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -422,13 +422,13 @@  static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page,
 
 static ssize_t queue_poll_show(struct request_queue *q, char *page)
 {
-	return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page);
+	return queue_var_show(blk_queue_poll(q), page);
 }
 
 static ssize_t queue_poll_store(struct request_queue *q, const char *page,
 				size_t count)
 {
-	if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
+	if (!blk_queue_poll(q))
 		return -EINVAL;
 	pr_info_ratelimited("writes to the poll attribute are ignored.\n");
 	pr_info_ratelimited("please use driver specific parameters instead.\n");
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index fe0b8da3de7f..e31c7704ef4d 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1025,7 +1025,7 @@  static void nvme_execute_rq_polled(struct request_queue *q,
 {
 	DECLARE_COMPLETION_ONSTACK(wait);
 
-	WARN_ON_ONCE(!test_bit(QUEUE_FLAG_POLL, &q->queue_flags));
+	WARN_ON_ONCE(!blk_queue_poll(q));
 
 	rq->cmd_flags |= REQ_POLLED;
 	rq->end_io_data = &wait;
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 561b04117bd4..fc0ba0b80776 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -677,6 +677,7 @@  bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
 #define blk_queue_fua(q)	test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
 #define blk_queue_registered(q)	test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
 #define blk_queue_nowait(q)	test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags)
+#define blk_queue_poll(q)	test_bit(QUEUE_FLAG_POLL, &(q)->queue_flags)
 
 extern void blk_set_pm_only(struct request_queue *q);
 extern void blk_clear_pm_only(struct request_queue *q);