1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *   Copyright (C) International Business Machines Corp., 2000-2004
4 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
5 */
6
7#include <linux/fs.h>
8#include <linux/ctype.h>
9#include <linux/module.h>
10#include <linux/proc_fs.h>
11#include <linux/seq_file.h>
12#include <linux/uaccess.h>
13#include "jfs_incore.h"
14#include "jfs_filsys.h"
15#include "jfs_debug.h"
16
17#ifdef PROC_FS_JFS /* see jfs_debug.h */
18
19#ifdef CONFIG_JFS_DEBUG
20static int jfs_loglevel_proc_show(struct seq_file *m, void *v)
21{
22	seq_printf(m, "%d\n", jfsloglevel);
23	return 0;
24}
25
26static int jfs_loglevel_proc_open(struct inode *inode, struct file *file)
27{
28	return single_open(file, jfs_loglevel_proc_show, NULL);
29}
30
31static ssize_t jfs_loglevel_proc_write(struct file *file,
32		const char __user *buffer, size_t count, loff_t *ppos)
33{
34	char c;
35
36	if (get_user(c, buffer))
37		return -EFAULT;
38
39	/* yes, I know this is an ASCIIism.  --hch */
40	if (c < '0' || c > '9')
41		return -EINVAL;
42	jfsloglevel = c - '0';
43	return count;
44}
45
46static const struct proc_ops jfs_loglevel_proc_ops = {
47	.proc_open	= jfs_loglevel_proc_open,
48	.proc_read	= seq_read,
49	.proc_lseek	= seq_lseek,
50	.proc_release	= single_release,
51	.proc_write	= jfs_loglevel_proc_write,
52};
53#endif
54
55void jfs_proc_init(void)
56{
57	struct proc_dir_entry *base;
58
59	base = proc_mkdir("fs/jfs", NULL);
60	if (!base)
61		return;
62
63#ifdef CONFIG_JFS_STATISTICS
64	proc_create_single("lmstats", 0, base, jfs_lmstats_proc_show);
65	proc_create_single("txstats", 0, base, jfs_txstats_proc_show);
66	proc_create_single("xtstat", 0, base, jfs_xtstat_proc_show);
67	proc_create_single("mpstat", 0, base, jfs_mpstat_proc_show);
68#endif
69#ifdef CONFIG_JFS_DEBUG
70	proc_create_single("TxAnchor", 0, base, jfs_txanchor_proc_show);
71	proc_create("loglevel", 0, base, &jfs_loglevel_proc_ops);
72#endif
73}
74
75void jfs_proc_clean(void)
76{
77	remove_proc_subtree("fs/jfs", NULL);
78}
79
80#endif /* PROC_FS_JFS */
81