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06b3db1b DH |
1 | /* General filesystem local caching manager |
2 | * | |
3 | * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #define FSCACHE_DEBUG_LEVEL CACHE | |
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 "internal.h" | |
19 | ||
20 | MODULE_DESCRIPTION("FS Cache Manager"); | |
21 | MODULE_AUTHOR("Red Hat, Inc."); | |
22 | MODULE_LICENSE("GPL"); | |
23 | ||
24 | unsigned fscache_defer_lookup = 1; | |
25 | module_param_named(defer_lookup, fscache_defer_lookup, uint, | |
26 | S_IWUSR | S_IRUGO); | |
27 | MODULE_PARM_DESC(fscache_defer_lookup, | |
28 | "Defer cookie lookup to background thread"); | |
29 | ||
30 | unsigned fscache_defer_create = 1; | |
31 | module_param_named(defer_create, fscache_defer_create, uint, | |
32 | S_IWUSR | S_IRUGO); | |
33 | MODULE_PARM_DESC(fscache_defer_create, | |
34 | "Defer cookie creation to background thread"); | |
35 | ||
36 | unsigned fscache_debug; | |
37 | module_param_named(debug, fscache_debug, uint, | |
38 | S_IWUSR | S_IRUGO); | |
39 | MODULE_PARM_DESC(fscache_debug, | |
40 | "FS-Cache debugging mask"); | |
41 | ||
42 | struct kobject *fscache_root; | |
43 | ||
44 | /* | |
45 | * initialise the fs caching module | |
46 | */ | |
47 | static int __init fscache_init(void) | |
48 | { | |
49 | int ret; | |
50 | ||
3d7a641e | 51 | ret = slow_work_register_user(THIS_MODULE); |
06b3db1b DH |
52 | if (ret < 0) |
53 | goto error_slow_work; | |
54 | ||
7394daa8 DH |
55 | ret = fscache_proc_init(); |
56 | if (ret < 0) | |
57 | goto error_proc; | |
58 | ||
955d0091 DH |
59 | fscache_cookie_jar = kmem_cache_create("fscache_cookie_jar", |
60 | sizeof(struct fscache_cookie), | |
61 | 0, | |
62 | 0, | |
63 | fscache_cookie_init_once); | |
64 | if (!fscache_cookie_jar) { | |
65 | printk(KERN_NOTICE | |
66 | "FS-Cache: Failed to allocate a cookie jar\n"); | |
67 | ret = -ENOMEM; | |
68 | goto error_cookie_jar; | |
69 | } | |
70 | ||
4c515dd4 DH |
71 | fscache_root = kobject_create_and_add("fscache", kernel_kobj); |
72 | if (!fscache_root) | |
73 | goto error_kobj; | |
74 | ||
06b3db1b DH |
75 | printk(KERN_NOTICE "FS-Cache: Loaded\n"); |
76 | return 0; | |
77 | ||
4c515dd4 | 78 | error_kobj: |
955d0091 DH |
79 | kmem_cache_destroy(fscache_cookie_jar); |
80 | error_cookie_jar: | |
4c515dd4 | 81 | fscache_proc_cleanup(); |
7394daa8 | 82 | error_proc: |
3d7a641e | 83 | slow_work_unregister_user(THIS_MODULE); |
06b3db1b DH |
84 | error_slow_work: |
85 | return ret; | |
86 | } | |
87 | ||
88 | fs_initcall(fscache_init); | |
89 | ||
90 | /* | |
91 | * clean up on module removal | |
92 | */ | |
93 | static void __exit fscache_exit(void) | |
94 | { | |
95 | _enter(""); | |
96 | ||
4c515dd4 | 97 | kobject_put(fscache_root); |
955d0091 | 98 | kmem_cache_destroy(fscache_cookie_jar); |
7394daa8 | 99 | fscache_proc_cleanup(); |
3d7a641e | 100 | slow_work_unregister_user(THIS_MODULE); |
06b3db1b DH |
101 | printk(KERN_NOTICE "FS-Cache: Unloaded\n"); |
102 | } | |
103 | ||
104 | module_exit(fscache_exit); | |
2868cbea DH |
105 | |
106 | /* | |
107 | * wait_on_bit() sleep function for uninterruptible waiting | |
108 | */ | |
109 | int fscache_wait_bit(void *flags) | |
110 | { | |
111 | schedule(); | |
112 | return 0; | |
113 | } | |
114 | EXPORT_SYMBOL(fscache_wait_bit); | |
115 | ||
116 | /* | |
117 | * wait_on_bit() sleep function for interruptible waiting | |
118 | */ | |
119 | int fscache_wait_bit_interruptible(void *flags) | |
120 | { | |
121 | schedule(); | |
122 | return signal_pending(current); | |
123 | } | |
124 | EXPORT_SYMBOL(fscache_wait_bit_interruptible); |