Commit | Line | Data |
---|---|---|
1c8284eb MD |
1 | /* |
2 | * Copyright (C) 2008 Mathieu Desnoyers | |
3 | * | |
4 | * Dual LGPL v2.1/GPL v2 license. | |
5 | */ | |
6 | ||
7 | #include <linux/module.h> | |
8 | #include <linux/debugfs.h> | |
9 | #include <linux/fs.h> | |
10 | #include <linux/mutex.h> | |
11 | ||
12 | #include "ltt-tracer.h" | |
13 | ||
14 | #define LTT_FILTER_DIR "filter" | |
15 | ||
16 | /* | |
17 | * Protects the ltt_filter_dir allocation. | |
18 | */ | |
19 | static DEFINE_MUTEX(ltt_filter_mutex); | |
20 | ||
21 | static struct dentry *ltt_filter_dir; | |
22 | ||
23 | struct dentry *get_filter_root(void) | |
24 | { | |
25 | struct dentry *ltt_root_dentry; | |
26 | ||
27 | mutex_lock(<t_filter_mutex); | |
28 | if (!ltt_filter_dir) { | |
29 | ltt_root_dentry = get_ltt_root(); | |
30 | if (!ltt_root_dentry) | |
31 | goto err_no_root; | |
32 | ||
33 | ltt_filter_dir = debugfs_create_dir(LTT_FILTER_DIR, | |
34 | ltt_root_dentry); | |
35 | if (!ltt_filter_dir) | |
36 | printk(KERN_ERR | |
37 | "ltt_filter_init: failed to create dir %s\n", | |
38 | LTT_FILTER_DIR); | |
39 | } | |
40 | err_no_root: | |
41 | mutex_unlock(<t_filter_mutex); | |
42 | return ltt_filter_dir; | |
43 | } | |
44 | EXPORT_SYMBOL_GPL(get_filter_root); | |
45 | ||
46 | static void __exit ltt_filter_exit(void) | |
47 | { | |
48 | debugfs_remove(ltt_filter_dir); | |
49 | } | |
50 | ||
51 | module_exit(ltt_filter_exit); | |
52 | ||
53 | MODULE_LICENSE("GPL and additional rights"); | |
54 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>"); | |
55 | MODULE_DESCRIPTION("Linux Trace Toolkit Filter"); |