1/* FS-Cache statistics viewing interface
2 *
3 * Copyright (C) 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 OPERATION
13#include <linux/module.h>
14#include <linux/proc_fs.h>
15#include <linux/seq_file.h>
16#include "internal.h"
17
18/*
19 * initialise the /proc/fs/fscache/ directory
20 */
21int __init fscache_proc_init(void)
22{
23	_enter("");
24
25	if (!proc_mkdir("fs/fscache", NULL))
26		goto error_dir;
27
28#ifdef CONFIG_FSCACHE_STATS
29	if (!proc_create("fs/fscache/stats", S_IFREG | 0444, NULL,
30			 &fscache_stats_fops))
31		goto error_stats;
32#endif
33
34#ifdef CONFIG_FSCACHE_HISTOGRAM
35	if (!proc_create("fs/fscache/histogram", S_IFREG | 0444, NULL,
36			 &fscache_histogram_fops))
37		goto error_histogram;
38#endif
39
40#ifdef CONFIG_FSCACHE_OBJECT_LIST
41	if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL,
42			 &fscache_objlist_fops))
43		goto error_objects;
44#endif
45
46	_leave(" = 0");
47	return 0;
48
49#ifdef CONFIG_FSCACHE_OBJECT_LIST
50error_objects:
51#endif
52#ifdef CONFIG_FSCACHE_HISTOGRAM
53	remove_proc_entry("fs/fscache/histogram", NULL);
54error_histogram:
55#endif
56#ifdef CONFIG_FSCACHE_STATS
57	remove_proc_entry("fs/fscache/stats", NULL);
58error_stats:
59#endif
60	remove_proc_entry("fs/fscache", NULL);
61error_dir:
62	_leave(" = -ENOMEM");
63	return -ENOMEM;
64}
65
66/*
67 * clean up the /proc/fs/fscache/ directory
68 */
69void fscache_proc_cleanup(void)
70{
71#ifdef CONFIG_FSCACHE_OBJECT_LIST
72	remove_proc_entry("fs/fscache/objects", NULL);
73#endif
74#ifdef CONFIG_FSCACHE_HISTOGRAM
75	remove_proc_entry("fs/fscache/histogram", NULL);
76#endif
77#ifdef CONFIG_FSCACHE_STATS
78	remove_proc_entry("fs/fscache/stats", NULL);
79#endif
80	remove_proc_entry("fs/fscache", NULL);
81}
82