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From: Bernd Schubert <[email protected]>
To: Miklos Szeredi <[email protected]>, Jens Axboe <[email protected]>,
	 Pavel Begunkov <[email protected]>,
	[email protected]
Cc: [email protected], [email protected],
	 Joanne Koong <[email protected]>,
	Josef Bacik <[email protected]>,
	 Amir Goldstein <[email protected]>,
	Bernd Schubert <[email protected]>
Subject: [PATCH RFC v3 15/17] ate: 2024-08-30 15:43:32 +0100
Date: Sun, 01 Sep 2024 15:37:09 +0200	[thread overview]
Message-ID: <20240901-b4-fuse-uring-rfcv3-without-mmap-v3-15-9207f7391444@ddn.com> (raw)
In-Reply-To: <20240901-b4-fuse-uring-rfcv3-without-mmap-v3-0-9207f7391444@ddn.com>

From: Pavel Begunkov <[email protected]>

io_uring/cmd: let cmds tw know about dying task

When the taks that submitted a request is dying, a task work for that
request might get run by a kernel thread or even worse by a half
dismantled task. We can't just cancel the task work without running the
callback as the cmd might need to do some clean up, so pass a flag
instead. If set, it's not safe to access any task resources and the
callback is expected to cancel the cmd ASAP.

Signed-off-by: Pavel Begunkov <[email protected]>
---
 include/linux/io_uring_types.h | 1 +
 io_uring/uring_cmd.c           | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h
index 7abdc0927124..869a81c63e49 100644
--- a/include/linux/io_uring_types.h
+++ b/include/linux/io_uring_types.h
@@ -37,6 +37,7 @@ enum io_uring_cmd_flags {
 	/* set when uring wants to cancel a previously issued command */
 	IO_URING_F_CANCEL		= (1 << 11),
 	IO_URING_F_COMPAT		= (1 << 12),
+	IO_URING_F_TASK_DEAD		= (1 << 13),
 };
 
 struct io_wq_work_node {
diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c
index 21ac5fb2d5f0..e6d22b6fc0f4 100644
--- a/io_uring/uring_cmd.c
+++ b/io_uring/uring_cmd.c
@@ -119,9 +119,13 @@ EXPORT_SYMBOL_GPL(io_uring_cmd_mark_cancelable);
 static void io_uring_cmd_work(struct io_kiocb *req, struct io_tw_state *ts)
 {
 	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
+	unsigned flags = IO_URING_F_COMPLETE_DEFER;
+
+	if (req->task->flags & PF_EXITING)
+		flags |= IO_URING_F_TASK_DEAD;
 
 	/* task_work executor checks the deffered list completion */
-	ioucmd->task_work_cb(ioucmd, IO_URING_F_COMPLETE_DEFER);
+	ioucmd->task_work_cb(ioucmd, flags);
 }
 
 void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,

-- 
2.43.0


  parent reply	other threads:[~2024-09-01 14:11 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-09-01 13:36 [PATCH RFC v3 00/17] fuse: fuse-over-io-uring Bernd Schubert
2024-09-01 13:36 ` [PATCH RFC v3 01/17] fuse: rename to fuse_dev_end_requests and make non-static Bernd Schubert
2024-09-01 13:36 ` [PATCH RFC v3 02/17] fuse: Move fuse_get_dev to header file Bernd Schubert
2024-09-01 13:36 ` [PATCH RFC v3 03/17] fuse: Move request bits Bernd Schubert
2024-09-01 13:36 ` [PATCH RFC v3 04/17] fuse: Add fuse-io-uring design documentation Bernd Schubert
2024-09-01 13:36 ` [PATCH RFC v3 05/17] fuse: Add a uring config ioctl Bernd Schubert
2024-09-04  0:43   ` Joanne Koong
2024-09-04 22:24     ` Bernd Schubert
2024-09-06 19:23       ` Joanne Koong
2024-09-01 13:37 ` [PATCH RFC v3 06/17] fuse: Add the queue configuration ioctl Bernd Schubert
2024-09-04 22:23   ` Joanne Koong
2024-09-04 22:38     ` Bernd Schubert
2024-09-04 22:42       ` Joanne Koong
2024-09-01 13:37 ` [PATCH RFC v3 07/17] fuse: {uring} Add a dev_release exception for fuse-over-io-uring Bernd Schubert
2024-09-01 13:37 ` [PATCH RFC v3 08/17] fuse: {uring} Handle SQEs - register commands Bernd Schubert
2024-09-04 15:40   ` Jens Axboe
2024-09-01 13:37 ` [PATCH RFC v3 09/17] fuse: Make fuse_copy non static Bernd Schubert
2024-09-01 13:37 ` [PATCH RFC v3 10/17] fuse: Add buffer offset for uring into fuse_copy_state Bernd Schubert
2024-09-01 13:37 ` [PATCH RFC v3 11/17] fuse: {uring} Add uring sqe commit and fetch support Bernd Schubert
2024-09-01 13:37 ` [PATCH RFC v3 12/17] fuse: {uring} Handle teardown of ring entries Bernd Schubert
2024-09-01 13:37 ` [PATCH RFC v3 13/17] fuse: {uring} Add a ring queue and send method Bernd Schubert
2024-09-01 13:37 ` [PATCH RFC v3 14/17] fuse: {uring} Allow to queue to the ring Bernd Schubert
2024-09-01 13:37 ` Bernd Schubert [this message]
2024-09-04 15:43   ` [PATCH RFC v3 15/17] ate: 2024-08-30 15:43:32 +0100 Jens Axboe
2024-09-04 15:54     ` Bernd Schubert
2024-09-01 13:37 ` [PATCH RFC v3 16/17] fuse: {uring} Handle IO_URING_F_TASK_DEAD Bernd Schubert
2024-09-01 13:37 ` [PATCH RFC v3 17/17] fuse: {uring} Pin the user buffer Bernd Schubert
2024-09-04 15:47   ` Jens Axboe
2024-09-04 16:08     ` Bernd Schubert
2024-09-04 16:16       ` Jens Axboe
2024-09-04 19:25         ` Bernd Schubert
2024-09-04 19:40           ` Jens Axboe
2024-09-05 21:04             ` Bernd Schubert
2024-09-04 18:59   ` Jens Axboe
2024-09-04 16:42 ` [PATCH RFC v3 00/17] fuse: fuse-over-io-uring Jens Axboe
2024-09-04 19:37   ` Bernd Schubert
2024-09-04 19:41     ` Jens Axboe

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