Linux Kernel  3.7.1
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proc.c
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1 /* FS-Cache statistics viewing interface
2  *
3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells ([email protected])
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  */
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("fs/fscache/stats", S_IFREG | 0444, NULL,
31  goto error_stats;
32 #endif
33 
34 #ifdef CONFIG_FSCACHE_HISTOGRAM
35  if (!proc_create("fs/fscache/histogram", S_IFREG | 0444, NULL,
37  goto error_histogram;
38 #endif
39 
40 #ifdef CONFIG_FSCACHE_OBJECT_LIST
41  if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL,
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  */
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 }