/* SPDX-License-Identifier: GPL-2.0-only *//* * Common helpers for stackable filesystems and backing files. * * Copyright (C) 2023 CTERA Networks. */ #ifndef _LINUX_BACKING_FILE_H#define _LINUX_BACKING_FILE_H #include <linux/file.h>#include <linux/uio.h>#include <linux/fs.h> struct backing_file_ctx {	const struct cred *cred;	void (*accessed)(struct file *file);	void (*end_write)(struct kiocb *iocb, ssize_t);}; struct file *backing_file_open(const struct file *user_file, int flags,			       const struct path *real_path,			       const struct cred *cred);struct file *backing_tmpfile_open(const struct file *user_file, int flags,				  const struct path *real_parentpath,				  umode_t mode, const struct cred *cred);ssize_t backing_file_read_iter(struct file *file, struct iov_iter *iter,			       struct kiocb *iocb, int flags,			       struct backing_file_ctx *ctx);ssize_t backing_file_write_iter(struct file *file, struct iov_iter *iter,				struct kiocb *iocb, int flags,				struct backing_file_ctx *ctx);ssize_t backing_file_splice_read(struct file *in, struct kiocb *iocb,				 struct pipe_inode_info *pipe, size_t len,				 unsigned int flags,				 struct backing_file_ctx *ctx);ssize_t backing_file_splice_write(struct pipe_inode_info *pipe,				  struct file *out, struct kiocb *iocb,				  size_t len, unsigned int flags,				  struct backing_file_ctx *ctx);int backing_file_mmap(struct file *file, struct vm_area_struct *vma,		      struct backing_file_ctx *ctx); #endif /* _LINUX_BACKING_FILE_H */