Commit a9216fac authored by Anuj Gupta's avatar Anuj Gupta Committed by Jens Axboe
Browse files

io_uring: add io_uring_cmd_import_fixed 



This is a new helper that callers can use to obtain a bvec iterator for
the previously mapped buffer. This is preparatory work to enable
fixed-buffer support for io_uring_cmd.

Signed-off-by: default avatarAnuj Gupta <anuj20.g@samsung.com>
Signed-off-by: default avatarKanchan Joshi <joshi.k@samsung.com>
Link: https://lore.kernel.org/r/20220930062749.152261-2-anuj20.g@samsung.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 851eb780

include/linux/io_uring.h

+8 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 


#include <linux/sched.h>

#include <linux/xarray.h>

#include <uapi/linux/io_uring.h>



enum io_uring_cmd_flags {

	IO_URING_F_COMPLETE_DEFER	= 1,
@@ -32,6 +33,8 @@ struct io_uring_cmd { 
};



#if defined(CONFIG_IO_URING)

int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,

			      struct iov_iter *iter, void *ioucmd);

void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret, ssize_t res2);

void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,

			void (*task_work_cb)(struct io_uring_cmd *));
@@ -59,6 +62,11 @@ static inline void io_uring_free(struct task_struct *tsk) 
		__io_uring_free(tsk);

}

#else

static int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,

			      struct iov_iter *iter, void *ioucmd)

{

	return -EOPNOTSUPP;

}

static inline void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret,

		ssize_t ret2)

{

io_uring/uring_cmd.c

+10 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
#include <uapi/linux/io_uring.h>



#include "io_uring.h"

#include "rsrc.h"

#include "uring_cmd.h"



static void io_uring_cmd_work(struct io_kiocb *req, bool *locked)
@@ -129,3 +130,12 @@ int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags) 


	return IOU_ISSUE_SKIP_COMPLETE;

}



int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,

			      struct iov_iter *iter, void *ioucmd)

{

	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);



	return io_import_fixed(rw, iter, req->imu, ubuf, len);

}

EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);