[linux-block.git] / io_uring / splice.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/io_uring.h>
#include <linux/splice.h>

#include <uapi/linux/io_uring.h>

#include "io_uring.h"
#include "splice.h"

struct io_splice {
	struct file			*file_out;
	loff_t				off_out;
	loff_t				off_in;
	u64				len;
	int				splice_fd_in;
	unsigned int			flags;
};

static int __io_splice_prep(struct io_kiocb *req,
			    const struct io_uring_sqe *sqe)
{
	struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
	unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL;

	sp->len = READ_ONCE(sqe->len);
	sp->flags = READ_ONCE(sqe->splice_flags);
	if (unlikely(sp->flags & ~valid_flags))
		return -EINVAL;
	sp->splice_fd_in = READ_ONCE(sqe->splice_fd_in);
	return 0;
}

int io_tee_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off))
		return -EINVAL;
	return __io_splice_prep(req, sqe);
}

int io_tee(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
	struct file *out = sp->file_out;
	unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
	struct file *in;
	long ret = 0;

	if (issue_flags & IO_URING_F_NONBLOCK)
		return -EAGAIN;

	if (sp->flags & SPLICE_F_FD_IN_FIXED)
		in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags);
	else
		in = io_file_get_normal(req, sp->splice_fd_in);
	if (!in) {
		ret = -EBADF;
		goto done;
	}

	if (sp->len)
		ret = do_tee(in, out, sp->len, flags);

	if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
		io_put_file(in);
done:
	if (ret != sp->len)
		req_set_fail(req);
	io_req_set_res(req, ret, 0);
	return IOU_OK;
}

int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);

	sp->off_in = READ_ONCE(sqe->splice_off_in);
	sp->off_out = READ_ONCE(sqe->off);
	return __io_splice_prep(req, sqe);
}

int io_splice(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
	struct file *out = sp->file_out;
	unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
	loff_t *poff_in, *poff_out;
	struct file *in;
	long ret = 0;

	if (issue_flags & IO_URING_F_NONBLOCK)
		return -EAGAIN;

	if (sp->flags & SPLICE_F_FD_IN_FIXED)
		in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags);
	else
		in = io_file_get_normal(req, sp->splice_fd_in);
	if (!in) {
		ret = -EBADF;
		goto done;
	}

	poff_in = (sp->off_in == -1) ? NULL : &sp->off_in;
	poff_out = (sp->off_out == -1) ? NULL : &sp->off_out;

	if (sp->len)
		ret = do_splice(in, poff_in, out, poff_out, sp->len, flags);

	if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
		io_put_file(in);
done:
	if (ret != sp->len)
		req_set_fail(req);
	io_req_set_res(req, ret, 0);
	return IOU_OK;
}
Commit	Line	Data
531113bb JA	1	// SPDX-License-Identifier: GPL-2.0
	2	#include <linux/kernel.h>
	3	#include <linux/errno.h>
	4	#include <linux/fs.h>
	5	#include <linux/file.h>
	6	#include <linux/mm.h>
	7	#include <linux/slab.h>
	8	#include <linux/namei.h>
	9	#include <linux/io_uring.h>
	10	#include <linux/splice.h>
	11
	12	#include <uapi/linux/io_uring.h>
	13
531113bb JA	14	#include "io_uring.h"
	15	#include "splice.h"
	16
	17	struct io_splice {
	18	struct file *file_out;
	19	loff_t off_out;
	20	loff_t off_in;
	21	u64 len;
	22	int splice_fd_in;
	23	unsigned int flags;
	24	};
	25
	26	static int __io_splice_prep(struct io_kiocb *req,
	27	const struct io_uring_sqe *sqe)
	28	{
f2ccb5ae	29	struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
531113bb JA	30	unsigned int valid_flags = SPLICE_F_FD_IN_FIXED \| SPLICE_F_ALL;
	31
	32	sp->len = READ_ONCE(sqe->len);
	33	sp->flags = READ_ONCE(sqe->splice_flags);
	34	if (unlikely(sp->flags & ~valid_flags))
	35	return -EINVAL;
	36	sp->splice_fd_in = READ_ONCE(sqe->splice_fd_in);
	37	return 0;
	38	}
	39
	40	int io_tee_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	41	{
	42	if (READ_ONCE(sqe->splice_off_in) \|\| READ_ONCE(sqe->off))
	43	return -EINVAL;
	44	return __io_splice_prep(req, sqe);
	45	}
	46
	47	int io_tee(struct io_kiocb *req, unsigned int issue_flags)
	48	{
f2ccb5ae	49	struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
531113bb JA	50	struct file *out = sp->file_out;
	51	unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
	52	struct file *in;
	53	long ret = 0;
	54
	55	if (issue_flags & IO_URING_F_NONBLOCK)
	56	return -EAGAIN;
	57
	58	if (sp->flags & SPLICE_F_FD_IN_FIXED)
	59	in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags);
	60	else
	61	in = io_file_get_normal(req, sp->splice_fd_in);
	62	if (!in) {
	63	ret = -EBADF;
	64	goto done;
	65	}
	66
	67	if (sp->len)
	68	ret = do_tee(in, out, sp->len, flags);
	69
	70	if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
	71	io_put_file(in);
	72	done:
	73	if (ret != sp->len)
	74	req_set_fail(req);
	75	io_req_set_res(req, ret, 0);
	76	return IOU_OK;
	77	}
	78
	79	int io_splice_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	80	{
f2ccb5ae	81	struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
531113bb JA	82
	83	sp->off_in = READ_ONCE(sqe->splice_off_in);
	84	sp->off_out = READ_ONCE(sqe->off);
	85	return __io_splice_prep(req, sqe);
	86	}
	87
	88	int io_splice(struct io_kiocb *req, unsigned int issue_flags)
	89	{
f2ccb5ae	90	struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
531113bb JA	91	struct file *out = sp->file_out;
	92	unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
	93	loff_t poff_in, poff_out;
	94	struct file *in;
	95	long ret = 0;
	96
	97	if (issue_flags & IO_URING_F_NONBLOCK)
	98	return -EAGAIN;
	99
	100	if (sp->flags & SPLICE_F_FD_IN_FIXED)
	101	in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags);
	102	else
	103	in = io_file_get_normal(req, sp->splice_fd_in);
	104	if (!in) {
	105	ret = -EBADF;
	106	goto done;
	107	}
	108
	109	poff_in = (sp->off_in == -1) ? NULL : &sp->off_in;
	110	poff_out = (sp->off_out == -1) ? NULL : &sp->off_out;
	111
	112	if (sp->len)
	113	ret = do_splice(in, poff_in, out, poff_out, sp->len, flags);
	114
	115	if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
	116	io_put_file(in);
	117	done:
	118	if (ret != sp->len)
	119	req_set_fail(req);
	120	io_req_set_res(req, ret, 0);
	121	return IOU_OK;
	122	}