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9ae326a6 DH |
1 | /* Network filesystem caching backend to use cache files on a premounted |
2 | * filesystem | |
3 | * | |
4 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
5 | * Written by David Howells (dhowells@redhat.com) | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public Licence | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the Licence, or (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/completion.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/file.h> | |
20 | #include <linux/namei.h> | |
21 | #include <linux/mount.h> | |
22 | #include <linux/statfs.h> | |
23 | #include <linux/sysctl.h> | |
24 | #include <linux/miscdevice.h> | |
25 | #include "internal.h" | |
26 | ||
27 | unsigned cachefiles_debug; | |
28 | module_param_named(debug, cachefiles_debug, uint, S_IWUSR | S_IRUGO); | |
29 | MODULE_PARM_DESC(cachefiles_debug, "CacheFiles debugging mask"); | |
30 | ||
31 | MODULE_DESCRIPTION("Mounted-filesystem based cache"); | |
32 | MODULE_AUTHOR("Red Hat, Inc."); | |
33 | MODULE_LICENSE("GPL"); | |
34 | ||
35 | struct kmem_cache *cachefiles_object_jar; | |
36 | ||
37 | static struct miscdevice cachefiles_dev = { | |
38 | .minor = MISC_DYNAMIC_MINOR, | |
39 | .name = "cachefiles", | |
40 | .fops = &cachefiles_daemon_fops, | |
41 | }; | |
42 | ||
43 | static void cachefiles_object_init_once(void *_object) | |
44 | { | |
45 | struct cachefiles_object *object = _object; | |
46 | ||
47 | memset(object, 0, sizeof(*object)); | |
48 | spin_lock_init(&object->work_lock); | |
49 | } | |
50 | ||
51 | /* | |
52 | * initialise the fs caching module | |
53 | */ | |
54 | static int __init cachefiles_init(void) | |
55 | { | |
56 | int ret; | |
57 | ||
58 | ret = misc_register(&cachefiles_dev); | |
59 | if (ret < 0) | |
60 | goto error_dev; | |
61 | ||
62 | /* create an object jar */ | |
63 | ret = -ENOMEM; | |
64 | cachefiles_object_jar = | |
65 | kmem_cache_create("cachefiles_object_jar", | |
66 | sizeof(struct cachefiles_object), | |
67 | 0, | |
68 | SLAB_HWCACHE_ALIGN, | |
69 | cachefiles_object_init_once); | |
70 | if (!cachefiles_object_jar) { | |
0227d6ab | 71 | pr_notice("Failed to allocate an object jar\n"); |
9ae326a6 DH |
72 | goto error_object_jar; |
73 | } | |
74 | ||
75 | ret = cachefiles_proc_init(); | |
76 | if (ret < 0) | |
77 | goto error_proc; | |
78 | ||
0227d6ab | 79 | pr_info("Loaded\n"); |
9ae326a6 DH |
80 | return 0; |
81 | ||
82 | error_proc: | |
83 | kmem_cache_destroy(cachefiles_object_jar); | |
84 | error_object_jar: | |
85 | misc_deregister(&cachefiles_dev); | |
86 | error_dev: | |
6ff66ac7 | 87 | pr_err("failed to register: %d\n", ret); |
9ae326a6 DH |
88 | return ret; |
89 | } | |
90 | ||
91 | fs_initcall(cachefiles_init); | |
92 | ||
93 | /* | |
94 | * clean up on module removal | |
95 | */ | |
96 | static void __exit cachefiles_exit(void) | |
97 | { | |
0227d6ab | 98 | pr_info("Unloading\n"); |
9ae326a6 DH |
99 | |
100 | cachefiles_proc_cleanup(); | |
101 | kmem_cache_destroy(cachefiles_object_jar); | |
102 | misc_deregister(&cachefiles_dev); | |
103 | } | |
104 | ||
105 | module_exit(cachefiles_exit); |