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