blob: beeab44bc31a2f987267c898150244c7dee0e9a2 [file] [log] [blame]
David Howells7394daa2009-04-03 16:42:37 +01001/* 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 _leave(" = 0");
41 return 0;
42
43#ifdef CONFIG_FSCACHE_HISTOGRAM
44error_histogram:
45#endif
46#ifdef CONFIG_FSCACHE_STATS
47 remove_proc_entry("fs/fscache/stats", NULL);
48error_stats:
49#endif
50 remove_proc_entry("fs/fscache", NULL);
51error_dir:
52 _leave(" = -ENOMEM");
53 return -ENOMEM;
54}
55
56/*
57 * clean up the /proc/fs/fscache/ directory
58 */
59void fscache_proc_cleanup(void)
60{
61#ifdef CONFIG_FSCACHE_HISTOGRAM
62 remove_proc_entry("fs/fscache/histogram", NULL);
63#endif
64#ifdef CONFIG_FSCACHE_STATS
65 remove_proc_entry("fs/fscache/stats", NULL);
66#endif
67 remove_proc_entry("fs/fscache", NULL);
68}