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 * Add files to /proc/fs/netfs/.
16 */
17int __init fscache_proc_init(void)
18{
19 if (!proc_symlink("fs/fscache", NULL, "netfs"))
20 goto error_sym;
21
22 if (!proc_create_seq("fs/netfs/caches", S_IFREG | 0444, NULL,
23 &fscache_caches_seq_ops))
24 goto error;
25
26 if (!proc_create_seq("fs/netfs/volumes", S_IFREG | 0444, NULL,
27 &fscache_volumes_seq_ops))
28 goto error;
29
30 if (!proc_create_seq("fs/netfs/cookies", S_IFREG | 0444, NULL,
31 &fscache_cookies_seq_ops))
32 goto error;
33 return 0;
34
35error:
36 remove_proc_entry("fs/fscache", NULL);
37error_sym:
38 return -ENOMEM;
39}
40
41/*
42 * Clean up the /proc/fs/fscache symlink.
43 */
44void fscache_proc_cleanup(void)
45{
46 remove_proc_subtree("fs/fscache", NULL);
47}
48

source code of linux/fs/netfs/fscache_proc.c