Commit | Line | Data |
---|---|---|
77443f61 DH |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* Network filesystem caching backend to use cache files on a premounted | |
3 | * filesystem | |
4 | * | |
5 | * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved. | |
6 | * Written by David Howells (dhowells@redhat.com) | |
7 | */ | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/completion.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/file.h> | |
16 | #include <linux/namei.h> | |
17 | #include <linux/mount.h> | |
18 | #include <linux/statfs.h> | |
19 | #include <linux/sysctl.h> | |
20 | #include <linux/miscdevice.h> | |
21 | #include <linux/netfs.h> | |
22 | #include <trace/events/netfs.h> | |
23 | #define CREATE_TRACE_POINTS | |
24 | #include "internal.h" | |
25 | ||
26 | unsigned cachefiles_debug; | |
27 | module_param_named(debug, cachefiles_debug, uint, S_IWUSR | S_IRUGO); | |
28 | MODULE_PARM_DESC(cachefiles_debug, "CacheFiles debugging mask"); | |
29 | ||
30 | MODULE_DESCRIPTION("Mounted-filesystem based cache"); | |
31 | MODULE_AUTHOR("Red Hat, Inc."); | |
32 | MODULE_LICENSE("GPL"); | |
33 | ||
df98e87f DH |
34 | struct kmem_cache *cachefiles_object_jar; |
35 | ||
8667d434 DH |
36 | static struct miscdevice cachefiles_dev = { |
37 | .minor = MISC_DYNAMIC_MINOR, | |
38 | .name = "cachefiles", | |
39 | .fops = &cachefiles_daemon_fops, | |
40 | }; | |
41 | ||
77443f61 DH |
42 | /* |
43 | * initialise the fs caching module | |
44 | */ | |
45 | static int __init cachefiles_init(void) | |
46 | { | |
a70f6526 DH |
47 | int ret; |
48 | ||
49 | ret = cachefiles_register_error_injection(); | |
50 | if (ret < 0) | |
51 | goto error_einj; | |
8667d434 DH |
52 | ret = misc_register(&cachefiles_dev); |
53 | if (ret < 0) | |
54 | goto error_dev; | |
a70f6526 | 55 | |
df98e87f DH |
56 | /* create an object jar */ |
57 | ret = -ENOMEM; | |
58 | cachefiles_object_jar = | |
59 | kmem_cache_create("cachefiles_object_jar", | |
60 | sizeof(struct cachefiles_object), | |
61 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
62 | if (!cachefiles_object_jar) { | |
63 | pr_notice("Failed to allocate an object jar\n"); | |
64 | goto error_object_jar; | |
65 | } | |
66 | ||
77443f61 DH |
67 | pr_info("Loaded\n"); |
68 | return 0; | |
a70f6526 | 69 | |
df98e87f DH |
70 | error_object_jar: |
71 | misc_deregister(&cachefiles_dev); | |
8667d434 DH |
72 | error_dev: |
73 | cachefiles_unregister_error_injection(); | |
a70f6526 DH |
74 | error_einj: |
75 | pr_err("failed to register: %d\n", ret); | |
76 | return ret; | |
77443f61 DH |
77 | } |
78 | ||
79 | fs_initcall(cachefiles_init); | |
80 | ||
81 | /* | |
82 | * clean up on module removal | |
83 | */ | |
84 | static void __exit cachefiles_exit(void) | |
85 | { | |
86 | pr_info("Unloading\n"); | |
a70f6526 | 87 | |
df98e87f | 88 | kmem_cache_destroy(cachefiles_object_jar); |
8667d434 | 89 | misc_deregister(&cachefiles_dev); |
a70f6526 | 90 | cachefiles_unregister_error_injection(); |
77443f61 DH |
91 | } |
92 | ||
93 | module_exit(cachefiles_exit); |