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From: Keith Busch <kbusch@kernel.org>
To: linux-nvme@lists.infradead.org, sagi@grimberg.me, hch@lst.de,
	axboe@kernel.dk, linux-block@vger.kernel.org
Cc: Keith Busch <kbusch@kernel.org>, Yuanyuan Zhong <yzhong@purestorage.com>
Subject: [PATCH 1/2] block: return errors from blk_execute_rq()
Date: Fri, 16 Apr 2021 09:53:52 -0700
Message-ID: <20210416165353.3088547-1-kbusch@kernel.org> (raw)

The synchronous blk_execute_rq() had not provided a way for its callers
to know if its request was successful or not. Return the errno from the
completion status.

Reported-by: Yuanyuan Zhong <yzhong@purestorage.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
---
 block/blk-exec.c       | 6 ++++--
 include/linux/blkdev.h | 2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/block/blk-exec.c b/block/blk-exec.c
index beae70a0e5e5..3877a2677dd4 100644
--- a/block/blk-exec.c
+++ b/block/blk-exec.c
@@ -21,7 +21,7 @@ static void blk_end_sync_rq(struct request *rq, blk_status_t error)
 {
 	struct completion *waiting = rq->end_io_data;
 
-	rq->end_io_data = NULL;
+	rq->end_io_data = ERR_PTR(blk_status_to_errno(error));
 
 	/*
 	 * complete last, if this is a stack request the process (and thus
@@ -72,8 +72,9 @@ EXPORT_SYMBOL_GPL(blk_execute_rq_nowait);
  * Description:
  *    Insert a fully prepared request at the back of the I/O scheduler queue
  *    for execution and wait for completion.
+ * Return: The errno value of the blk_status_t provided to blk_mq_end_request().
  */
-void blk_execute_rq(struct gendisk *bd_disk, struct request *rq, int at_head)
+int blk_execute_rq(struct gendisk *bd_disk, struct request *rq, int at_head)
 {
 	DECLARE_COMPLETION_ONSTACK(wait);
 	unsigned long hang_check;
@@ -87,5 +88,6 @@ void blk_execute_rq(struct gendisk *bd_disk, struct request *rq, int at_head)
 		while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2)));
 	else
 		wait_for_completion_io(&wait);
+	return PTR_ERR_OR_ZERO(rq->end_io_data);
 }
 EXPORT_SYMBOL(blk_execute_rq);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index b91ba6207365..15e4ffac33af 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -938,7 +938,7 @@ extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, uns
 extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
 			       struct rq_map_data *, const struct iov_iter *,
 			       gfp_t);
-extern void blk_execute_rq(struct gendisk *, struct request *, int);
+extern int blk_execute_rq(struct gendisk *, struct request *, int);
 extern void blk_execute_rq_nowait(struct gendisk *,
 				  struct request *, int, rq_end_io_fn *);
 
-- 
2.25.4


             reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-16 16:53 Keith Busch [this message]
2021-04-16 16:53 ` [PATCH 2/2] nvme: use return value " Keith Busch
2021-04-16 17:12   ` Yuanyuan Zhong
2021-04-16 17:17     ` Keith Busch
2021-04-19  7:16       ` Christoph Hellwig
2021-04-19 15:14         ` Keith Busch
2021-04-19 17:27           ` Yuanyuan Zhong
2021-04-19 17:48             ` Keith Busch
2021-04-19 18:20               ` Yuanyuan Zhong
2021-04-18  4:17   ` Chaitanya Kulkarni
2021-04-18  4:13 ` [PATCH 1/2] block: return errors " Chaitanya Kulkarni
2021-04-23 21:57 Keith Busch
2021-04-23 22:04 ` Keith Busch
2021-04-26 14:31 ` Christoph Hellwig

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