Commit f49eca21 authored by Jens Axboe's avatar Jens Axboe
Browse files

io_uring: add generic command payload type to struct io_kiocb 



Each opcode generally has a command structure in io_kiocb which it can
use to store data associated with that request.

In preparation for having the core layer not know about what's inside
these fields, add a generic io_cmd_data type and put in the union as
well.

Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent dc919caf

io_uring/io_uring.c

+17 −4
Original line number Diff line number Diff line
@@ -954,14 +954,27 @@ enum { 
};



/*

 * NOTE! Each of the iocb union members has the file pointer

 * Each request type overlays its private data structure on top of this one.

 * They must not exceed this one in size.

 */

struct io_cmd_data {

	struct file		*file;

	/* each command gets 56 bytes of data */

	__u8			data[56];

};



#define io_kiocb_to_cmd(req)	((void *) &(req)->cmd)



struct io_kiocb {

	union {

		/*

		 * NOTE! Each of the io_kiocb union members has the file pointer

		 * as the first entry in their struct definition. So you can

		 * access the file pointer through any of the sub-structs,

		 * or directly as just 'file' in this struct.

		 */

struct io_kiocb {

	union {

		struct file		*file;

		struct io_cmd_data	cmd;

		struct io_rw		rw;

		struct io_poll_iocb	poll;

		struct io_poll_update	poll_update;