[linux-block.git] / io_uring / advise.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 <uapi/linux/fadvise.h>
#include <uapi/linux/io_uring.h>

#include "io_uring.h"
#include "advise.h"

struct io_fadvise {
	struct file			*file;
	u64				offset;
	u32				len;
	u32				advice;
};

struct io_madvise {
	struct file			*file;
	u64				addr;
	u32				len;
	u32				advice;
};

int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
	struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);

	if (sqe->buf_index || sqe->off || sqe->splice_fd_in)
		return -EINVAL;

	ma->addr = READ_ONCE(sqe->addr);
	ma->len = READ_ONCE(sqe->len);
	ma->advice = READ_ONCE(sqe->fadvise_advice);
	return 0;
#else
	return -EOPNOTSUPP;
#endif
}

int io_madvise(struct io_kiocb *req, unsigned int issue_flags)
{
#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
	struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
	int ret;

	if (issue_flags & IO_URING_F_NONBLOCK)
		return -EAGAIN;

	ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);
	io_req_set_res(req, ret, 0);
	return IOU_OK;
#else
	return -EOPNOTSUPP;
#endif
}

int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);

	if (sqe->buf_index || sqe->addr || sqe->splice_fd_in)
		return -EINVAL;

	fa->offset = READ_ONCE(sqe->off);
	fa->len = READ_ONCE(sqe->len);
	fa->advice = READ_ONCE(sqe->fadvise_advice);
	return 0;
}

int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
	int ret;

	if (issue_flags & IO_URING_F_NONBLOCK) {
		switch (fa->advice) {
		case POSIX_FADV_NORMAL:
		case POSIX_FADV_RANDOM:
		case POSIX_FADV_SEQUENTIAL:
			break;
		default:
			return -EAGAIN;
		}
	}

	ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
	if (ret < 0)
		req_set_fail(req);
	io_req_set_res(req, ret, 0);
	return IOU_OK;
}
Commit	Line	Data
f4c163dd 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
	11	#include <uapi/linux/fadvise.h>
	12	#include <uapi/linux/io_uring.h>
	13
f4c163dd JA	14	#include "io_uring.h"
	15	#include "advise.h"
	16
	17	struct io_fadvise {
	18	struct file *file;
	19	u64 offset;
	20	u32 len;
	21	u32 advice;
	22	};
	23
	24	struct io_madvise {
	25	struct file *file;
	26	u64 addr;
	27	u32 len;
	28	u32 advice;
	29	};
	30
	31	int io_madvise_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	32	{
	33	#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
f2ccb5ae	34	struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
f4c163dd JA	35
	36	if (sqe->buf_index \|\| sqe->off \|\| sqe->splice_fd_in)
	37	return -EINVAL;
	38
	39	ma->addr = READ_ONCE(sqe->addr);
	40	ma->len = READ_ONCE(sqe->len);
	41	ma->advice = READ_ONCE(sqe->fadvise_advice);
	42	return 0;
	43	#else
	44	return -EOPNOTSUPP;
	45	#endif
	46	}
	47
	48	int io_madvise(struct io_kiocb *req, unsigned int issue_flags)
	49	{
	50	#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
f2ccb5ae	51	struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
f4c163dd JA	52	int ret;
	53
	54	if (issue_flags & IO_URING_F_NONBLOCK)
	55	return -EAGAIN;
	56
	57	ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);
	58	io_req_set_res(req, ret, 0);
	59	return IOU_OK;
	60	#else
	61	return -EOPNOTSUPP;
	62	#endif
	63	}
	64
	65	int io_fadvise_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	66	{
f2ccb5ae	67	struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
f4c163dd JA	68
	69	if (sqe->buf_index \|\| sqe->addr \|\| sqe->splice_fd_in)
	70	return -EINVAL;
	71
	72	fa->offset = READ_ONCE(sqe->off);
	73	fa->len = READ_ONCE(sqe->len);
	74	fa->advice = READ_ONCE(sqe->fadvise_advice);
	75	return 0;
	76	}
	77
	78	int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
	79	{
f2ccb5ae	80	struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
f4c163dd JA	81	int ret;
	82
	83	if (issue_flags & IO_URING_F_NONBLOCK) {
	84	switch (fa->advice) {
	85	case POSIX_FADV_NORMAL:
	86	case POSIX_FADV_RANDOM:
	87	case POSIX_FADV_SEQUENTIAL:
	88	break;
	89	default:
	90	return -EAGAIN;
	91	}
	92	}
	93
	94	ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
	95	if (ret < 0)
	96	req_set_fail(req);
	97	io_req_set_res(req, ret, 0);
	98	return IOU_OK;
	99	}