Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Common helpers for stackable filesystems and backing files.
4 *
5 * Copyright (C) 2023 CTERA Networks.
6 */
7
8#ifndef _LINUX_BACKING_FILE_H
9#define _LINUX_BACKING_FILE_H
10
11#include <linux/file.h>
12#include <linux/uio.h>
13#include <linux/fs.h>
14
15struct backing_file_ctx {
16 const struct cred *cred;
17 void (*accessed)(struct file *file);
18 void (*end_write)(struct kiocb *iocb, ssize_t);
19};
20
21struct file *backing_file_open(const struct path *user_path, int flags,
22 const struct path *real_path,
23 const struct cred *cred);
24struct file *backing_tmpfile_open(const struct path *user_path, int flags,
25 const struct path *real_parentpath,
26 umode_t mode, const struct cred *cred);
27ssize_t backing_file_read_iter(struct file *file, struct iov_iter *iter,
28 struct kiocb *iocb, int flags,
29 struct backing_file_ctx *ctx);
30ssize_t backing_file_write_iter(struct file *file, struct iov_iter *iter,
31 struct kiocb *iocb, int flags,
32 struct backing_file_ctx *ctx);
33ssize_t backing_file_splice_read(struct file *in, struct kiocb *iocb,
34 struct pipe_inode_info *pipe, size_t len,
35 unsigned int flags,
36 struct backing_file_ctx *ctx);
37ssize_t backing_file_splice_write(struct pipe_inode_info *pipe,
38 struct file *out, struct kiocb *iocb,
39 size_t len, unsigned int flags,
40 struct backing_file_ctx *ctx);
41int backing_file_mmap(struct file *file, struct vm_area_struct *vma,
42 struct backing_file_ctx *ctx);
43
44#endif /* _LINUX_BACKING_FILE_H */