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 <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 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         .open           = jfs_loglevel_proc_open,
  62         .read           = seq_read,
  63         .llseek         = seq_lseek,
  64         .release        = single_release,
  65         .write          = jfs_loglevel_proc_write,
  66 };
  67 #endif
  68
  69 static struct {
  70         const char      *name;
  71         const struct file_operations *proc_fops;
  72 } Entries[] = {
  73 #ifdef CONFIG_JFS_STATISTICS
  74         { "lmstats",    &jfs_lmstats_proc_fops, },
  75         { "txstats",    &jfs_txstats_proc_fops, },
  76         { "xtstat",     &jfs_xtstat_proc_fops, },
  77         { "mpstat",     &jfs_mpstat_proc_fops, },
  78 #endif
  79 #ifdef CONFIG_JFS_DEBUG
  80         { "TxAnchor",   &jfs_txanchor_proc_fops, },
  81         { "loglevel",   &jfs_loglevel_proc_fops }
  82 #endif
  83 };
  84 #define NPROCENT        ARRAY_SIZE(Entries)
  85
  86 void jfs_proc_init(void)
  87 {
  88         int i;
  89
  90         if (!(base = proc_mkdir("fs/jfs", NULL)))
  91                 return;
  92
  93         for (i = 0; i < NPROCENT; i++)
  94                 proc_create(Entries[i].name, 0, base, Entries[i].proc_fops);
  95 }
  96
  97 void jfs_proc_clean(void)
  98 {
  99         int i;
 100
 101         if (base) {
 102                 for (i = 0; i < NPROCENT; i++)
 103                         remove_proc_entry(Entries[i].name, base);
 104                 remove_proc_entry("fs/jfs", NULL);
 105         }
 106 }
 107
 108 #endif /* PROC_FS_JFS */