// 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/fsnotify.h> #include <uapi/linux/io_uring.h> #include "io_uring.h"#include "sync.h" struct io_sync {	struct file			*file;	loff_t				len;	loff_t				off;	int				flags;	int				mode;}; int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe){	struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync); 	if (unlikely(sqe->addr || sqe->buf_index || sqe->splice_fd_in))		return -EINVAL; 	sync->off = READ_ONCE(sqe->off);	sync->len = READ_ONCE(sqe->len);	sync->flags = READ_ONCE(sqe->sync_range_flags);	req->flags |= REQ_F_FORCE_ASYNC; 	return 0;} int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags){	struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);	int ret; 	/* sync_file_range always requires a blocking context */	WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); 	ret = sync_file_range(req->file, sync->off, sync->len, sync->flags);	io_req_set_res(req, ret, 0);	return IOU_COMPLETE;} int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe){	struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync); 	if (unlikely(sqe->addr || sqe->buf_index || sqe->splice_fd_in))		return -EINVAL; 	sync->flags = READ_ONCE(sqe->fsync_flags);	if (unlikely(sync->flags & ~IORING_FSYNC_DATASYNC))		return -EINVAL; 	sync->off = READ_ONCE(sqe->off);	if (sync->off < 0)		return -EINVAL;	sync->len = READ_ONCE(sqe->len);	req->flags |= REQ_F_FORCE_ASYNC;	return 0;} int io_fsync(struct io_kiocb *req, unsigned int issue_flags){	struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);	loff_t end = sync->off + sync->len;	int ret; 	/* fsync always requires a blocking context */	WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); 	ret = vfs_fsync_range(req->file, sync->off, end > 0 ? end : LLONG_MAX,				sync->flags & IORING_FSYNC_DATASYNC);	io_req_set_res(req, ret, 0);	return IOU_COMPLETE;} int io_fallocate_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe){	struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync); 	if (sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)		return -EINVAL; 	sync->off = READ_ONCE(sqe->off);	sync->len = READ_ONCE(sqe->addr);	sync->mode = READ_ONCE(sqe->len);	req->flags |= REQ_F_FORCE_ASYNC;	return 0;} int io_fallocate(struct io_kiocb *req, unsigned int issue_flags){	struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);	int ret; 	/* fallocate always requiring blocking context */	WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); 	ret = vfs_fallocate(req->file, sync->mode, sync->off, sync->len);	if (ret >= 0)		fsnotify_modify(req->file);	io_req_set_res(req, ret, 0);	return IOU_COMPLETE;}