[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_types.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);
	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 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);

	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 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
	14	#include "io_uring_types.h"
	15	#include "io_uring.h"
	16	#include "splice.h"
	17
	18	struct io_splice {
	19	struct file *file_out;
	20	loff_t off_out;
	21	loff_t off_in;
	22	u64 len;
	23	int splice_fd_in;
	24	unsigned int flags;
	25	};
	26
	27	static int __io_splice_prep(struct io_kiocb *req,
	28	const struct io_uring_sqe *sqe)
	29	{
	30	struct io_splice *sp = io_kiocb_to_cmd(req);
	31	unsigned int valid_flags = SPLICE_F_FD_IN_FIXED \| SPLICE_F_ALL;
	32
	33	sp->len = READ_ONCE(sqe->len);
	34	sp->flags = READ_ONCE(sqe->splice_flags);
	35	if (unlikely(sp->flags & ~valid_flags))
	36	return -EINVAL;
	37	sp->splice_fd_in = READ_ONCE(sqe->splice_fd_in);
	38	return 0;
	39	}
	40
	41	int io_tee_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	42	{
	43	if (READ_ONCE(sqe->splice_off_in) \|\| READ_ONCE(sqe->off))
	44	return -EINVAL;
	45	return __io_splice_prep(req, sqe);
	46	}
	47
	48	int io_tee(struct io_kiocb *req, unsigned int issue_flags)
	49	{
	50	struct io_splice *sp = io_kiocb_to_cmd(req);
	51	struct file *out = sp->file_out;
	52	unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
	53	struct file *in;
	54	long ret = 0;
	55
	56	if (issue_flags & IO_URING_F_NONBLOCK)
	57	return -EAGAIN;
	58
	59	if (sp->flags & SPLICE_F_FD_IN_FIXED)
	60	in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags);
	61	else
	62	in = io_file_get_normal(req, sp->splice_fd_in);
	63	if (!in) {
	64	ret = -EBADF;
65	goto done;
66	}
67
68	if (sp->len)
69	ret = do_tee(in, out, sp->len, flags);
70
71	if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
72	io_put_file(in);
73	done:
74	if (ret != sp->len)
75	req_set_fail(req);
76	io_req_set_res(req, ret, 0);
77	return IOU_OK;
78	}
79
80	int io_splice_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
81	{
82	struct io_splice *sp = io_kiocb_to_cmd(req);
83
84	sp->off_in = READ_ONCE(sqe->splice_off_in);
85	sp->off_out = READ_ONCE(sqe->off);
86	return __io_splice_prep(req, sqe);
87	}
88
89	int io_splice(struct io_kiocb *req, unsigned int issue_flags)
90	{
91	struct io_splice *sp = io_kiocb_to_cmd(req);
92	struct file *out = sp->file_out;
93	unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
94	loff_t poff_in, poff_out;
95	struct file *in;
96	long ret = 0;
97
98	if (issue_flags & IO_URING_F_NONBLOCK)
99	return -EAGAIN;
100
101	if (sp->flags & SPLICE_F_FD_IN_FIXED)
102	in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags);
103	else
104	in = io_file_get_normal(req, sp->splice_fd_in);
105	if (!in) {
106	ret = -EBADF;
107	goto done;
108	}
109
110	poff_in = (sp->off_in == -1) ? NULL : &sp->off_in;
111	poff_out = (sp->off_out == -1) ? NULL : &sp->off_out;
112
113	if (sp->len)
114	ret = do_splice(in, poff_in, out, poff_out, sp->len, flags);
115
116	if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
117	io_put_file(in);
118	done:
119	if (ret != sp->len)
120	req_set_fail(req);
121	io_req_set_res(req, ret, 0);
122	return IOU_OK;
123	}