Root/fs/jfs/jfs_debug.c

1/*
2 * Copyright (C) International Business Machines Corp., 2000-2004
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/fs.h>
21#include <linux/ctype.h>
22#include <linux/module.h>
23#include <linux/proc_fs.h>
24#include <linux/seq_file.h>
25#include <asm/uaccess.h>
26#include "jfs_incore.h"
27#include "jfs_filsys.h"
28#include "jfs_debug.h"
29
30#ifdef PROC_FS_JFS /* see jfs_debug.h */
31
32static struct proc_dir_entry *base;
33#ifdef CONFIG_JFS_DEBUG
34static int jfs_loglevel_proc_show(struct seq_file *m, void *v)
35{
36    seq_printf(m, "%d\n", jfsloglevel);
37    return 0;
38}
39
40static int jfs_loglevel_proc_open(struct inode *inode, struct file *file)
41{
42    return single_open(file, jfs_loglevel_proc_show, NULL);
43}
44
45static ssize_t jfs_loglevel_proc_write(struct file *file,
46        const char __user *buffer, size_t count, loff_t *ppos)
47{
48    char c;
49
50    if (get_user(c, buffer))
51        return -EFAULT;
52
53    /* yes, I know this is an ASCIIism. --hch */
54    if (c < '0' || c > '9')
55        return -EINVAL;
56    jfsloglevel = c - '0';
57    return count;
58}
59
60static const struct file_operations jfs_loglevel_proc_fops = {
61    .owner = THIS_MODULE,
62    .open = jfs_loglevel_proc_open,
63    .read = seq_read,
64    .llseek = seq_lseek,
65    .release = single_release,
66    .write = jfs_loglevel_proc_write,
67};
68#endif
69
70static struct {
71    const char *name;
72    const struct file_operations *proc_fops;
73} Entries[] = {
74#ifdef CONFIG_JFS_STATISTICS
75    { "lmstats", &jfs_lmstats_proc_fops, },
76    { "txstats", &jfs_txstats_proc_fops, },
77    { "xtstat", &jfs_xtstat_proc_fops, },
78    { "mpstat", &jfs_mpstat_proc_fops, },
79#endif
80#ifdef CONFIG_JFS_DEBUG
81    { "TxAnchor", &jfs_txanchor_proc_fops, },
82    { "loglevel", &jfs_loglevel_proc_fops }
83#endif
84};
85#define NPROCENT ARRAY_SIZE(Entries)
86
87void jfs_proc_init(void)
88{
89    int i;
90
91    if (!(base = proc_mkdir("fs/jfs", NULL)))
92        return;
93
94    for (i = 0; i < NPROCENT; i++)
95        proc_create(Entries[i].name, 0, base, Entries[i].proc_fops);
96}
97
98void jfs_proc_clean(void)
99{
100    int i;
101
102    if (base) {
103        for (i = 0; i < NPROCENT; i++)
104            remove_proc_entry(Entries[i].name, base);
105        remove_proc_entry("fs/jfs", NULL);
106    }
107}
108
109#endif /* PROC_FS_JFS */
110

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