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 | |
15 | struct backing_file_ctx { |
16 | const struct cred *cred; |
17 | struct file *user_file; |
18 | void (*accessed)(struct file *); |
19 | void (*end_write)(struct file *); |
20 | }; |
21 | |
22 | struct file *backing_file_open(const struct path *user_path, int flags, |
23 | const struct path *real_path, |
24 | const struct cred *cred); |
25 | ssize_t backing_file_read_iter(struct file *file, struct iov_iter *iter, |
26 | struct kiocb *iocb, int flags, |
27 | struct backing_file_ctx *ctx); |
28 | ssize_t backing_file_write_iter(struct file *file, struct iov_iter *iter, |
29 | struct kiocb *iocb, int flags, |
30 | struct backing_file_ctx *ctx); |
31 | ssize_t backing_file_splice_read(struct file *in, loff_t *ppos, |
32 | struct pipe_inode_info *pipe, size_t len, |
33 | unsigned int flags, |
34 | struct backing_file_ctx *ctx); |
35 | ssize_t backing_file_splice_write(struct pipe_inode_info *pipe, |
36 | struct file *out, loff_t *ppos, size_t len, |
37 | unsigned int flags, |
38 | struct backing_file_ctx *ctx); |
39 | int backing_file_mmap(struct file *file, struct vm_area_struct *vma, |
40 | struct backing_file_ctx *ctx); |
41 | |
42 | #endif /* _LINUX_BACKING_FILE_H */ |
43 | |