xref: /linux/fs/jfs/jfs_debug.c (revision bf80eef2212a1e8451df13b52533f4bc31bb4f8e)
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
20 static int jfs_loglevel_proc_show(struct seq_file *m, void *v)
21 {
22 	seq_printf(m, "%d\n", jfsloglevel);
23 	return 0;
24 }
25 
26 static int jfs_loglevel_proc_open(struct inode *inode, struct file *file)
27 {
28 	return single_open(file, jfs_loglevel_proc_show, NULL);
29 }
30 
31 static 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 
46 static 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 
55 void 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 
75 void jfs_proc_clean(void)
76 {
77 	remove_proc_subtree("fs/jfs", NULL);
78 }
79 
80 #endif /* PROC_FS_JFS */
81