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io_uring: add generic command payload type to struct io_kiocb

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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: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-05-24 08:32:05 -06:00
parent dc919caff6
commit f49eca2156
1 changed files with 17 additions and 4 deletions
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21
io_uring/io_uring.c
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@ -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.
* as the first entry in their struct definition. So you can * They must not exceed this one in size.
* access the file pointer through any of the sub-structs,
* or directly as just 'file' in this struct.
*/ */
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 { struct io_kiocb {
union { 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 file *file; struct file *file;
struct io_cmd_data cmd;
struct io_rw rw; struct io_rw rw;
struct io_poll_iocb poll; struct io_poll_iocb poll;
struct io_poll_update poll_update; struct io_poll_update poll_update;