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 <linux/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 
32 #ifdef CONFIG_JFS_DEBUG
jfs_loglevel_proc_show(struct seq_file * m,void * v)33 static int jfs_loglevel_proc_show(struct seq_file *m, void *v)
34 {
35 	seq_printf(m, "%d\n", jfsloglevel);
36 	return 0;
37 }
38 
jfs_loglevel_proc_open(struct inode * inode,struct file * file)39 static int jfs_loglevel_proc_open(struct inode *inode, struct file *file)
40 {
41 	return single_open(file, jfs_loglevel_proc_show, NULL);
42 }
43 
jfs_loglevel_proc_write(struct file * file,const char __user * buffer,size_t count,loff_t * ppos)44 static ssize_t jfs_loglevel_proc_write(struct file *file,
45 		const char __user *buffer, size_t count, loff_t *ppos)
46 {
47 	char c;
48 
49 	if (get_user(c, buffer))
50 		return -EFAULT;
51 
52 	/* yes, I know this is an ASCIIism.  --hch */
53 	if (c < '0' || c > '9')
54 		return -EINVAL;
55 	jfsloglevel = c - '0';
56 	return count;
57 }
58 
59 static const struct file_operations jfs_loglevel_proc_fops = {
60 	.open		= jfs_loglevel_proc_open,
61 	.read		= seq_read,
62 	.llseek		= seq_lseek,
63 	.release	= single_release,
64 	.write		= jfs_loglevel_proc_write,
65 };
66 #endif
67 
jfs_proc_init(void)68 void jfs_proc_init(void)
69 {
70 	struct proc_dir_entry *base;
71 
72 	base = proc_mkdir("fs/jfs", NULL);
73 	if (!base)
74 		return;
75 
76 #ifdef CONFIG_JFS_STATISTICS
77 	proc_create_single("lmstats", 0, base, jfs_lmstats_proc_show);
78 	proc_create_single("txstats", 0, base, jfs_txstats_proc_show);
79 	proc_create_single("xtstat", 0, base, jfs_xtstat_proc_show);
80 	proc_create_single("mpstat", 0, base, jfs_mpstat_proc_show);
81 #endif
82 #ifdef CONFIG_JFS_DEBUG
83 	proc_create_single("TxAnchor", 0, base, jfs_txanchor_proc_show);
84 	proc_create("loglevel", 0, base, &jfs_loglevel_proc_fops);
85 #endif
86 }
87 
jfs_proc_clean(void)88 void jfs_proc_clean(void)
89 {
90 	remove_proc_subtree("fs/jfs", NULL);
91 }
92 
93 #endif /* PROC_FS_JFS */
94