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#ifdef CONFIG_FSCACHE_STATS
25	if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
26			fscache_stats_show))
27		goto error_stats;
28#endif
29
30#ifdef CONFIG_FSCACHE_HISTOGRAM
31	if (!proc_create_seq("fs/fscache/histogram", S_IFREG | 0444, NULL,
32			 &fscache_histogram_ops))
33		goto error_histogram;
34#endif
35
36#ifdef CONFIG_FSCACHE_OBJECT_LIST
37	if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL,
38			 &fscache_objlist_proc_ops))
39		goto error_objects;
40#endif
41
42	_leave(" = 0");
43	return 0;
44
45#ifdef CONFIG_FSCACHE_OBJECT_LIST
46error_objects:
47#endif
48#ifdef CONFIG_FSCACHE_HISTOGRAM
49	remove_proc_entry("fs/fscache/histogram", NULL);
50error_histogram:
51#endif
52#ifdef CONFIG_FSCACHE_STATS
53	remove_proc_entry("fs/fscache/stats", NULL);
54error_stats:
55#endif
56	remove_proc_entry("fs/fscache", NULL);
57error_dir:
58	_leave(" = -ENOMEM");
59	return -ENOMEM;
60}
61
62/*
63 * clean up the /proc/fs/fscache/ directory
64 */
65void fscache_proc_cleanup(void)
66{
67#ifdef CONFIG_FSCACHE_OBJECT_LIST
68	remove_proc_entry("fs/fscache/objects", NULL);
69#endif
70#ifdef CONFIG_FSCACHE_HISTOGRAM
71	remove_proc_entry("fs/fscache/histogram", NULL);
72#endif
73#ifdef CONFIG_FSCACHE_STATS
74	remove_proc_entry("fs/fscache/stats", NULL);
75#endif
76	remove_proc_entry("fs/fscache", NULL);
77}