// 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;	u64				len;	u32				advice;}; struct io_madvise {	struct file			*file;	u64				addr;	u64				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->splice_fd_in)		return -EINVAL; 	ma->addr = READ_ONCE(sqe->addr);	ma->len = READ_ONCE(sqe->off);	if (!ma->len)		ma->len = READ_ONCE(sqe->len);	ma->advice = READ_ONCE(sqe->fadvise_advice);	req->flags |= REQ_F_FORCE_ASYNC;	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; 	WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); 	ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);	io_req_set_res(req, ret, 0);	return IOU_COMPLETE;#else	return -EOPNOTSUPP;#endif} static bool io_fadvise_force_async(struct io_fadvise *fa){	switch (fa->advice) {	case POSIX_FADV_NORMAL:	case POSIX_FADV_RANDOM:	case POSIX_FADV_SEQUENTIAL:		return false;	default:		return true;	}} 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->splice_fd_in)		return -EINVAL; 	fa->offset = READ_ONCE(sqe->off);	fa->len = READ_ONCE(sqe->addr);	if (!fa->len)		fa->len = READ_ONCE(sqe->len);	fa->advice = READ_ONCE(sqe->fadvise_advice);	if (io_fadvise_force_async(fa))		req->flags |= REQ_F_FORCE_ASYNC;	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; 	WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK && io_fadvise_force_async(fa)); 	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_COMPLETE;}