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7394daa8 DH |
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 | */ | |
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("fs/fscache/stats", S_IFREG | 0444, NULL, | |
30 | &fscache_stats_fops)) | |
31 | goto error_stats; | |
32 | #endif | |
33 | ||
34 | #ifdef CONFIG_FSCACHE_HISTOGRAM | |
35 | if (!proc_create("fs/fscache/histogram", S_IFREG | 0444, NULL, | |
36 | &fscache_histogram_fops)) | |
37 | goto error_histogram; | |
38 | #endif | |
39 | ||
40 | _leave(" = 0"); | |
41 | return 0; | |
42 | ||
43 | #ifdef CONFIG_FSCACHE_HISTOGRAM | |
44 | error_histogram: | |
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", NULL); | |
51 | error_dir: | |
52 | _leave(" = -ENOMEM"); | |
53 | return -ENOMEM; | |
54 | } | |
55 | ||
56 | /* | |
57 | * clean up the /proc/fs/fscache/ directory | |
58 | */ | |
59 | void fscache_proc_cleanup(void) | |
60 | { | |
61 | #ifdef CONFIG_FSCACHE_HISTOGRAM | |
62 | remove_proc_entry("fs/fscache/histogram", NULL); | |
63 | #endif | |
64 | #ifdef CONFIG_FSCACHE_STATS | |
65 | remove_proc_entry("fs/fscache/stats", NULL); | |
66 | #endif | |
67 | remove_proc_entry("fs/fscache", NULL); | |
68 | } |