FS-Cache: Annotate slow-work runqueue proc lines for FS-Cache work items
[linux-2.6.git] / fs / fscache / proc.c
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 }