LXR linux/fs/jfs/jfs

   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
  32static struct proc_dir_entry *base;
  33#ifdef CONFIG_JFS_DEBUG
  34static int jfs_loglevel_proc_show(struct seq_file *m, void *v)
  35{
  36        seq_printf(m, "%d\n", jfsloglevel);
  37        return 0;
  38}
  39
  40static int jfs_loglevel_proc_open(struct inode *inode, struct file *file)
  41{
  42        return single_open(file, jfs_loglevel_proc_show, NULL);
  43}
  44
  45static 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
  60static 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
  70static 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
  87void 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
  98void 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 */
 110