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
51 ret = slow_work_register_user();
52 if (ret < 0)
53 goto error_slow_work;
54
55 ret = fscache_proc_init();
56 if (ret < 0)
57 goto error_proc;
58
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
71 fscache_root = kobject_create_and_add("fscache", kernel_kobj);
72 if (!fscache_root)
73 goto error_kobj;
74
75 printk(KERN_NOTICE "FS-Cache: Loaded\n");
76 return 0;
77
78 error_kobj:
79 kmem_cache_destroy(fscache_cookie_jar);
80 error_cookie_jar:
81 fscache_proc_cleanup();
82 error_proc:
83 slow_work_unregister_user();
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
97 kobject_put(fscache_root);
98 kmem_cache_destroy(fscache_cookie_jar);
99 fscache_proc_cleanup();
100 slow_work_unregister_user();
101 printk(KERN_NOTICE "FS-Cache: Unloaded\n");
102 }
103
104 module_exit(fscache_exit);
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);
125
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