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 */
fscache_proc_init(void)17 int __init fscache_proc_init(void)
18 {
19 _enter("");
20
21 if (!proc_mkdir("fs/fscache", NULL))
22 goto error_dir;
23
24 if (!proc_create_seq("fs/fscache/cookies", S_IFREG | 0444, NULL,
25 &fscache_cookies_seq_ops))
26 goto error_cookies;
27
28 #ifdef CONFIG_FSCACHE_STATS
29 if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
30 fscache_stats_show))
31 goto error_stats;
32 #endif
33
34 #ifdef CONFIG_FSCACHE_OBJECT_LIST
35 if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL,
36 &fscache_objlist_proc_ops))
37 goto error_objects;
38 #endif
39
40 _leave(" = 0");
41 return 0;
42
43 #ifdef CONFIG_FSCACHE_OBJECT_LIST
44 error_objects:
45 #endif
46 #ifdef CONFIG_FSCACHE_STATS
47 remove_proc_entry("fs/fscache/stats", NULL);
48 error_stats:
49 #endif
50 remove_proc_entry("fs/fscache/cookies", NULL);
51 error_cookies:
52 remove_proc_entry("fs/fscache", NULL);
53 error_dir:
54 _leave(" = -ENOMEM");
55 return -ENOMEM;
56 }
57
58 /*
59 * clean up the /proc/fs/fscache/ directory
60 */
fscache_proc_cleanup(void)61 void fscache_proc_cleanup(void)
62 {
63 #ifdef CONFIG_FSCACHE_OBJECT_LIST
64 remove_proc_entry("fs/fscache/objects", NULL);
65 #endif
66 #ifdef CONFIG_FSCACHE_STATS
67 remove_proc_entry("fs/fscache/stats", NULL);
68 #endif
69 remove_proc_entry("fs/fscache/cookies", NULL);
70 remove_proc_entry("fs/fscache", NULL);
71 }
72