1 /* FS-Cache statistics viewing interface
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #define FSCACHE_DEBUG_LEVEL OPERATION
13 #include <linux/module.h>
14 #include <linux/proc_fs.h>
15 #include <linux/seq_file.h>
16 #include "internal.h"
17
18 /*
19 * initialise the /proc/fs/fscache/ directory
20 */
fscache_proc_init(void)21 int __init fscache_proc_init(void)
22 {
23 _enter("");
24
25 if (!proc_mkdir("fs/fscache", NULL))
26 goto error_dir;
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_HISTOGRAM
35 if (!proc_create_seq("fs/fscache/histogram", S_IFREG | 0444, NULL,
36 &fscache_histogram_ops))
37 goto error_histogram;
38 #endif
39
40 #ifdef CONFIG_FSCACHE_OBJECT_LIST
41 if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL,
42 &fscache_objlist_fops))
43 goto error_objects;
44 #endif
45
46 _leave(" = 0");
47 return 0;
48
49 #ifdef CONFIG_FSCACHE_OBJECT_LIST
50 error_objects:
51 #endif
52 #ifdef CONFIG_FSCACHE_HISTOGRAM
53 remove_proc_entry("fs/fscache/histogram", NULL);
54 error_histogram:
55 #endif
56 #ifdef CONFIG_FSCACHE_STATS
57 remove_proc_entry("fs/fscache/stats", NULL);
58 error_stats:
59 #endif
60 remove_proc_entry("fs/fscache", NULL);
61 error_dir:
62 _leave(" = -ENOMEM");
63 return -ENOMEM;
64 }
65
66 /*
67 * clean up the /proc/fs/fscache/ directory
68 */
fscache_proc_cleanup(void)69 void fscache_proc_cleanup(void)
70 {
71 #ifdef CONFIG_FSCACHE_OBJECT_LIST
72 remove_proc_entry("fs/fscache/objects", NULL);
73 #endif
74 #ifdef CONFIG_FSCACHE_HISTOGRAM
75 remove_proc_entry("fs/fscache/histogram", NULL);
76 #endif
77 #ifdef CONFIG_FSCACHE_STATS
78 remove_proc_entry("fs/fscache/stats", NULL);
79 #endif
80 remove_proc_entry("fs/fscache", NULL);
81 }
82