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b4d0d230 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
9ae326a6 DH |
2 | /* Network filesystem caching backend to use cache files on a premounted |
3 | * filesystem | |
4 | * | |
5 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
6 | * Written by David Howells (dhowells@redhat.com) | |
9ae326a6 DH |
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> | |
a18feb55 | 21 | #define CREATE_TRACE_POINTS |
9ae326a6 DH |
22 | #include "internal.h" |
23 | ||
24 | unsigned cachefiles_debug; | |
25 | module_param_named(debug, cachefiles_debug, uint, S_IWUSR | S_IRUGO); | |
26 | MODULE_PARM_DESC(cachefiles_debug, "CacheFiles debugging mask"); | |
27 | ||
28 | MODULE_DESCRIPTION("Mounted-filesystem based cache"); | |
29 | MODULE_AUTHOR("Red Hat, Inc."); | |
30 | MODULE_LICENSE("GPL"); | |
31 | ||
32 | struct kmem_cache *cachefiles_object_jar; | |
33 | ||
34 | static struct miscdevice cachefiles_dev = { | |
35 | .minor = MISC_DYNAMIC_MINOR, | |
36 | .name = "cachefiles", | |
37 | .fops = &cachefiles_daemon_fops, | |
38 | }; | |
39 | ||
40 | static void cachefiles_object_init_once(void *_object) | |
41 | { | |
42 | struct cachefiles_object *object = _object; | |
43 | ||
44 | memset(object, 0, sizeof(*object)); | |
45 | spin_lock_init(&object->work_lock); | |
46 | } | |
47 | ||
48 | /* | |
49 | * initialise the fs caching module | |
50 | */ | |
51 | static int __init cachefiles_init(void) | |
52 | { | |
53 | int ret; | |
54 | ||
55 | ret = misc_register(&cachefiles_dev); | |
56 | if (ret < 0) | |
57 | goto error_dev; | |
58 | ||
59 | /* create an object jar */ | |
60 | ret = -ENOMEM; | |
61 | cachefiles_object_jar = | |
62 | kmem_cache_create("cachefiles_object_jar", | |
63 | sizeof(struct cachefiles_object), | |
64 | 0, | |
65 | SLAB_HWCACHE_ALIGN, | |
66 | cachefiles_object_init_once); | |
67 | if (!cachefiles_object_jar) { | |
0227d6ab | 68 | pr_notice("Failed to allocate an object jar\n"); |
9ae326a6 DH |
69 | goto error_object_jar; |
70 | } | |
71 | ||
72 | ret = cachefiles_proc_init(); | |
73 | if (ret < 0) | |
74 | goto error_proc; | |
75 | ||
0227d6ab | 76 | pr_info("Loaded\n"); |
9ae326a6 DH |
77 | return 0; |
78 | ||
79 | error_proc: | |
80 | kmem_cache_destroy(cachefiles_object_jar); | |
81 | error_object_jar: | |
82 | misc_deregister(&cachefiles_dev); | |
83 | error_dev: | |
6ff66ac7 | 84 | pr_err("failed to register: %d\n", ret); |
9ae326a6 DH |
85 | return ret; |
86 | } | |
87 | ||
88 | fs_initcall(cachefiles_init); | |
89 | ||
90 | /* | |
91 | * clean up on module removal | |
92 | */ | |
93 | static void __exit cachefiles_exit(void) | |
94 | { | |
0227d6ab | 95 | pr_info("Unloading\n"); |
9ae326a6 DH |
96 | |
97 | cachefiles_proc_cleanup(); | |
98 | kmem_cache_destroy(cachefiles_object_jar); | |
99 | misc_deregister(&cachefiles_dev); | |
100 | } | |
101 | ||
102 | module_exit(cachefiles_exit); |