blob: add6bdb53f04400779ca899370d07bd2480e108a [file] [log] [blame]
David Howells06b3db12009-04-03 16:42:36 +01001/* 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
20MODULE_DESCRIPTION("FS Cache Manager");
21MODULE_AUTHOR("Red Hat, Inc.");
22MODULE_LICENSE("GPL");
23
24unsigned fscache_defer_lookup = 1;
25module_param_named(defer_lookup, fscache_defer_lookup, uint,
26 S_IWUSR | S_IRUGO);
27MODULE_PARM_DESC(fscache_defer_lookup,
28 "Defer cookie lookup to background thread");
29
30unsigned fscache_defer_create = 1;
31module_param_named(defer_create, fscache_defer_create, uint,
32 S_IWUSR | S_IRUGO);
33MODULE_PARM_DESC(fscache_defer_create,
34 "Defer cookie creation to background thread");
35
36unsigned fscache_debug;
37module_param_named(debug, fscache_debug, uint,
38 S_IWUSR | S_IRUGO);
39MODULE_PARM_DESC(fscache_debug,
40 "FS-Cache debugging mask");
41
42struct kobject *fscache_root;
43
44/*
45 * initialise the fs caching module
46 */
47static int __init fscache_init(void)
48{
49 int ret;
50
David Howells3d7a6412009-11-19 18:10:23 +000051 ret = slow_work_register_user(THIS_MODULE);
David Howells06b3db12009-04-03 16:42:36 +010052 if (ret < 0)
53 goto error_slow_work;
54
David Howells7394daa2009-04-03 16:42:37 +010055 ret = fscache_proc_init();
56 if (ret < 0)
57 goto error_proc;
58
David Howells955d00912009-04-03 16:42:38 +010059 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
David Howells4c515dd2009-04-03 16:42:37 +010071 fscache_root = kobject_create_and_add("fscache", kernel_kobj);
72 if (!fscache_root)
73 goto error_kobj;
74
David Howells06b3db12009-04-03 16:42:36 +010075 printk(KERN_NOTICE "FS-Cache: Loaded\n");
76 return 0;
77
David Howells4c515dd2009-04-03 16:42:37 +010078error_kobj:
David Howells955d00912009-04-03 16:42:38 +010079 kmem_cache_destroy(fscache_cookie_jar);
80error_cookie_jar:
David Howells4c515dd2009-04-03 16:42:37 +010081 fscache_proc_cleanup();
David Howells7394daa2009-04-03 16:42:37 +010082error_proc:
David Howells3d7a6412009-11-19 18:10:23 +000083 slow_work_unregister_user(THIS_MODULE);
David Howells06b3db12009-04-03 16:42:36 +010084error_slow_work:
85 return ret;
86}
87
88fs_initcall(fscache_init);
89
90/*
91 * clean up on module removal
92 */
93static void __exit fscache_exit(void)
94{
95 _enter("");
96
David Howells4c515dd2009-04-03 16:42:37 +010097 kobject_put(fscache_root);
David Howells955d00912009-04-03 16:42:38 +010098 kmem_cache_destroy(fscache_cookie_jar);
David Howells7394daa2009-04-03 16:42:37 +010099 fscache_proc_cleanup();
David Howells3d7a6412009-11-19 18:10:23 +0000100 slow_work_unregister_user(THIS_MODULE);
David Howells06b3db12009-04-03 16:42:36 +0100101 printk(KERN_NOTICE "FS-Cache: Unloaded\n");
102}
103
104module_exit(fscache_exit);
David Howells2868cbe2009-04-03 16:42:38 +0100105
106/*
107 * wait_on_bit() sleep function for uninterruptible waiting
108 */
109int fscache_wait_bit(void *flags)
110{
111 schedule();
112 return 0;
113}
114EXPORT_SYMBOL(fscache_wait_bit);
115
116/*
117 * wait_on_bit() sleep function for interruptible waiting
118 */
119int fscache_wait_bit_interruptible(void *flags)
120{
121 schedule();
122 return signal_pending(current);
123}
124EXPORT_SYMBOL(fscache_wait_bit_interruptible);