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 */
17 int __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
35 error:
36 remove_proc_entry("fs/fscache", NULL);
37 error_sym:
38 return -ENOMEM;
39 }
40
41 /*
42 * Clean up the /proc/fs/fscache symlink.
43 */
44 void fscache_proc_cleanup(void)
45 {
46 remove_proc_subtree("fs/fscache", NULL);
47 }
48
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