release/src-rt-6.x.4708/linux/linux-2.6.36/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
  32 static struct proc_dir_entry *base;
  33 #ifdef CONFIG_JFS_DEBUG
  34 static int jfs_loglevel_proc_show(struct seq_file *m, void *v)
  35 {
  36         seq_printf(m, "%d\n", jfsloglevel);
  37         return 0;
  38 }
  39
  40 static int jfs_loglevel_proc_open(struct inode *inode, struct file *file)
  41 {
  42         return single_open(file, jfs_loglevel_proc_show, NULL);
  43 }
  44
  45 static 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
  60 static 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
  70 static 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
  87 void 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
  98 void 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 */