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 <asm/uaccess.h>
25 #include "jfs_incore.h"
26 #include "jfs_filsys.h"
27 #include "jfs_debug.h"
28
29 #ifdef PROC_FS_JFS /* see jfs_debug.h */
30
31 static struct proc_dir_entry *base;
32 #ifdef CONFIG_JFS_DEBUG
33 static int loglevel_read(char *page, char **start, off_t off,
34 int count, int *eof, void *data)
35 {
36 int len;
37
38 len = sprintf(page, "%d\n", jfsloglevel);
39
40 len -= off;
41 *start = page + off;
42
43 if (len > count)
44 len = count;
45 else
46 *eof = 1;
47
48 if (len < 0)
49 len = 0;
50
51 return len;
52 }
53
54 static int loglevel_write(struct file *file, const char __user *buffer,
55 unsigned long count, void *data)
56 {
57 char c;
58
59 if (get_user(c, buffer))
60 return -EFAULT;
61
62 /* yes, I know this is an ASCIIism. --hch */
63 if (c < '' || c > '9')
64 return -EINVAL;
65 jfsloglevel = c - '';
66 return count;
67 }
68 #endif
69
70 static struct {
71 const char *name;
72 read_proc_t *read_fn;
73 write_proc_t *write_fn;
74 } Entries[] = {
75 #ifdef CONFIG_JFS_STATISTICS
76 { "lmstats", jfs_lmstats_read, },
77 { "txstats", jfs_txstats_read, },
78 { "xtstat", jfs_xtstat_read, },
79 { "mpstat", jfs_mpstat_read, },
80 #endif
81 #ifdef CONFIG_JFS_DEBUG
82 { "TxAnchor", jfs_txanchor_read, },
83 { "loglevel", loglevel_read, loglevel_write }
84 #endif
85 };
86 #define NPROCENT ARRAY_SIZE(Entries)
87
88 void jfs_proc_init(void)
89 {
90 int i;
91
92 if (!(base = proc_mkdir("jfs", proc_root_fs)))
93 return;
94 base->owner = THIS_MODULE;
95
96 for (i = 0; i < NPROCENT; i++) {
97 struct proc_dir_entry *p;
98 if ((p = create_proc_entry(Entries[i].name, 0, base))) {
99 p->read_proc = Entries[i].read_fn;
100 p->write_proc = Entries[i].write_fn;
101 }
102 }
103 }
104
105 void jfs_proc_clean(void)
106 {
107 int i;
108
109 if (base) {
110 for (i = 0; i < NPROCENT; i++)
111 remove_proc_entry(Entries[i].name, base);
112 remove_proc_entry("jfs", proc_root_fs);
113 }
114 }
115
116 #endif /* PROC_FS_JFS */
117
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