linux-kernel - Re: [PATCH] io_uring/uring_cmd: add io_uring_cmd_tw

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Message-ID: <3h5wdobeinxy7bbhvw3aztcns33cea3irxg4ckwvmds56ynyi4@45fy2e3uemz2>
Date: Sun, 7 Sep 2025 14:33:59 +0200
From: Klara Modin <klarasmodin@...il.com>
To: Caleb Sander Mateos <csander@...estorage.com>
Cc: Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] io_uring/uring_cmd: add io_uring_cmd_tw_t type alias

Hi,

On 2025-09-02 10:06:56 -0600, Caleb Sander Mateos wrote:
> Introduce a function pointer type alias io_uring_cmd_tw_t for the
> uring_cmd task work callback. This avoids repeating the signature in
> several places. Also name both arguments to the callback to clarify what
> they represent.
> 
> Signed-off-by: Caleb Sander Mateos <csander@...estorage.com>
> ---
>  include/linux/io_uring/cmd.h | 13 ++++++++-----
>  io_uring/uring_cmd.c         |  2 +-
>  2 files changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h
> index 4bd3a7339243..7211157edfe9 100644
> --- a/include/linux/io_uring/cmd.h
> +++ b/include/linux/io_uring/cmd.h
> @@ -9,15 +9,18 @@
>  /* only top 8 bits of sqe->uring_cmd_flags for kernel internal use */
>  #define IORING_URING_CMD_CANCELABLE	(1U << 30)
>  /* io_uring_cmd is being issued again */
>  #define IORING_URING_CMD_REISSUE	(1U << 31)
>  
> +typedef void (*io_uring_cmd_tw_t)(struct io_uring_cmd *cmd,
> +				  unsigned issue_flags);
> +
>  struct io_uring_cmd {
>  	struct file	*file;
>  	const struct io_uring_sqe *sqe;
>  	/* callback to defer completions to task context */
> -	void (*task_work_cb)(struct io_uring_cmd *cmd, unsigned);
> +	io_uring_cmd_tw_t task_work_cb;
>  	u32		cmd_op;
>  	u32		flags;
>  	u8		pdu[32]; /* available inline for free use */
>  };
>  
> @@ -55,11 +58,11 @@ int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,
>   */
>  void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret, u64 res2,
>  			unsigned issue_flags);
>  
>  void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
> -			    void (*task_work_cb)(struct io_uring_cmd *, unsigned),
> +			    io_uring_cmd_tw_t task_work_cb,
>  			    unsigned flags);
>  
>  /*
>   * Note: the caller should never hard code @issue_flags and only use the
>   * mask provided by the core io_uring code.
> @@ -104,11 +107,11 @@ static inline int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,
>  static inline void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret,
>  		u64 ret2, unsigned issue_flags)
>  {
>  }
>  static inline void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,

> -			    void (*task_work_cb)(struct io_uring_cmd *, unsigned),
> +			    io_uring_tw_t task_work_cb,

There seems to have slipped in a typo for the !IO_URING stub here:
s/io_uring_tw_t/io_uring_cmd_tw_t/

>  			    unsigned flags)
>  {
>  }
>  static inline void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd,
>  		unsigned int issue_flags)

...

Regards,
Klara Modin