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 */
fscache_proc_init(void)17 int __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
42 error:
43 remove_proc_entry("fs/fscache", NULL);
44 error_dir:
45 return -ENOMEM;
46 }
47
48 /*
49 * clean up the /proc/fs/fscache/ directory
50 */
fscache_proc_cleanup(void)51 void fscache_proc_cleanup(void)
52 {
53 remove_proc_subtree("fs/fscache", NULL);
54 }
55