1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _LINUX_KERNEL_READ_FILE_H |
3 | #define _LINUX_KERNEL_READ_FILE_H |
4 | |
5 | #include <linux/file.h> |
6 | #include <linux/types.h> |
7 | |
8 | /* This is a list of *what* is being read, not *how* nor *where*. */ |
9 | #define __kernel_read_file_id(id) \ |
10 | id(UNKNOWN, unknown) \ |
11 | id(FIRMWARE, firmware) \ |
12 | id(MODULE, kernel-module) \ |
13 | id(KEXEC_IMAGE, kexec-image) \ |
14 | id(KEXEC_INITRAMFS, kexec-initramfs) \ |
15 | id(POLICY, security-policy) \ |
16 | id(X509_CERTIFICATE, x509-certificate) \ |
17 | id(MAX_ID, ) |
18 | |
19 | #define __fid_enumify(ENUM, dummy) READING_ ## ENUM, |
20 | #define __fid_stringify(dummy, str) #str, |
21 | |
22 | enum kernel_read_file_id { |
23 | __kernel_read_file_id(__fid_enumify) |
24 | }; |
25 | |
26 | static const char * const kernel_read_file_str[] = { |
27 | __kernel_read_file_id(__fid_stringify) |
28 | }; |
29 | |
30 | static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id) |
31 | { |
32 | if ((unsigned int)id >= READING_MAX_ID) |
33 | return kernel_read_file_str[READING_UNKNOWN]; |
34 | |
35 | return kernel_read_file_str[id]; |
36 | } |
37 | |
38 | ssize_t kernel_read_file(struct file *file, loff_t offset, |
39 | void **buf, size_t buf_size, |
40 | size_t *file_size, |
41 | enum kernel_read_file_id id); |
42 | ssize_t kernel_read_file_from_path(const char *path, loff_t offset, |
43 | void **buf, size_t buf_size, |
44 | size_t *file_size, |
45 | enum kernel_read_file_id id); |
46 | ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset, |
47 | void **buf, size_t buf_size, |
48 | size_t *file_size, |
49 | enum kernel_read_file_id id); |
50 | ssize_t kernel_read_file_from_fd(int fd, loff_t offset, |
51 | void **buf, size_t buf_size, |
52 | size_t *file_size, |
53 | enum kernel_read_file_id id); |
54 | |
55 | #endif /* _LINUX_KERNEL_READ_FILE_H */ |
56 | |