proc.c revision 6ae9bd8b
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* FS-Cache statistics viewing interface
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8#define FSCACHE_DEBUG_LEVEL OPERATION
9#include <linux/module.h>
10#include <linux/proc_fs.h>
11#include <linux/seq_file.h>
12#include "internal.h"
13
14/*
15 * initialise the /proc/fs/fscache/ directory
16 */
17int __init fscache_proc_init(void)
18{
19	_enter("");
20
21	if (!proc_mkdir("fs/fscache", NULL))
22		goto error_dir;
23
24	if (!proc_create_seq("fs/fscache/cookies", S_IFREG | 0444, NULL,
25			     &fscache_cookies_seq_ops))
26		goto error_cookies;
27
28#ifdef CONFIG_FSCACHE_STATS
29	if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
30			fscache_stats_show))
31		goto error_stats;
32#endif
33
34#ifdef CONFIG_FSCACHE_OBJECT_LIST
35	if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL,
36			 &fscache_objlist_proc_ops))
37		goto error_objects;
38#endif
39
40	_leave(" = 0");
41	return 0;
42
43#ifdef CONFIG_FSCACHE_OBJECT_LIST
44error_objects:
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/cookies", NULL);
51error_cookies:
52	remove_proc_entry("fs/fscache", NULL);
53error_dir:
54	_leave(" = -ENOMEM");
55	return -ENOMEM;
56}
57
58/*
59 * clean up the /proc/fs/fscache/ directory
60 */
61void fscache_proc_cleanup(void)
62{
63#ifdef CONFIG_FSCACHE_OBJECT_LIST
64	remove_proc_entry("fs/fscache/objects", NULL);
65#endif
66#ifdef CONFIG_FSCACHE_STATS
67	remove_proc_entry("fs/fscache/stats", NULL);
68#endif
69	remove_proc_entry("fs/fscache/cookies", NULL);
70	remove_proc_entry("fs/fscache", NULL);
71}
72