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
next prev 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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