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f91a704f AG |
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> | |
a6293b3e AG |
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 | }; | |
f91a704f AG |
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); | |
a6293b3e AG |
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); | |
9b7e9e2f AG |
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); | |
f91a704f AG |
39 | |
40 | #endif /* _LINUX_BACKING_FILE_H */ |