linux-kernel - [PATCH V4 08/27] ublk: prepare for not tracking task context for command batch

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Message-ID: <20251121015851.3672073-9-ming.lei@redhat.com>
Date: Fri, 21 Nov 2025 09:58:30 +0800
From: Ming Lei <ming.lei@...hat.com>
To: Jens Axboe <axboe@...nel.dk>,
	linux-block@...r.kernel.org
Cc: Caleb Sander Mateos <csander@...estorage.com>,
	Uday Shankar <ushankar@...estorage.com>,
	Stefani Seibold <stefani@...bold.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Ming Lei <ming.lei@...hat.com>
Subject: [PATCH V4 08/27] ublk: prepare for not tracking task context for command batch

batch io is designed to be independent of task context, and we will not
track task context for batch io feature.

Reviewed-by: Caleb Sander Mateos <csander@...estorage.com>
Signed-off-by: Ming Lei <ming.lei@...hat.com>
---
 drivers/block/ublk_drv.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index 1fcca52591c3..c62b2f2057fe 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -2254,7 +2254,10 @@ static int __ublk_fetch(struct io_uring_cmd *cmd, struct ublk_device *ub,
 
 	ublk_fill_io_cmd(io, cmd);
 
-	WRITE_ONCE(io->task, get_task_struct(current));
+	if (ublk_dev_support_batch_io(ub))
+		WRITE_ONCE(io->task, NULL);
+	else
+		WRITE_ONCE(io->task, get_task_struct(current));
 	ublk_mark_io_ready(ub);
 
 	return 0;
-- 
2.47.0