1// SPDX-License-Identifier: GPL-2.0-or-later
 2/* FS-Cache statistics viewing interface
 3 *
 4 * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
 5 * Written by David Howells (dhowells@redhat.com)
 6 */
 7
 8#define FSCACHE_DEBUG_LEVEL CACHE
 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	if (!proc_mkdir("fs/fscache", NULL))
20		goto error_dir;
21
22	if (!proc_create_seq("fs/fscache/caches", S_IFREG | 0444, NULL,
23			     &fscache_caches_seq_ops))
24		goto error;
25
26	if (!proc_create_seq("fs/fscache/volumes", S_IFREG | 0444, NULL,
27			     &fscache_volumes_seq_ops))
28		goto error;
29
30	if (!proc_create_seq("fs/fscache/cookies", S_IFREG | 0444, NULL,
31			     &fscache_cookies_seq_ops))
32		goto error;
33
34#ifdef CONFIG_FSCACHE_STATS
35	if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
36				fscache_stats_show))
37		goto error;
38#endif
39
40	return 0;
41
42error:
43	remove_proc_entry("fs/fscache", NULL);
44error_dir:
45	return -ENOMEM;
46}
47
48/*
49 * clean up the /proc/fs/fscache/ directory
50 */
51void fscache_proc_cleanup(void)
52{
53	remove_proc_subtree("fs/fscache", NULL);
54}