jfs_debug.c

Go to the documentation of this file.

/*
 *   Copyright (C) International Business Machines Corp., 2000-2004
 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/fs.h>
#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include "jfs_incore.h"
#include "jfs_filsys.h"
#include "jfs_debug.h"

#ifdef PROC_FS_JFS /* see jfs_debug.h */

static struct proc_dir_entry *base;
#ifdef CONFIG_JFS_DEBUG
static int jfs_loglevel_proc_show(struct seq_file *m, void *v)
{
    seq_printf(m, "%d\n", jfsloglevel);
    return 0;
}

static int jfs_loglevel_proc_open(struct inode *inode, struct file *file)
{
    return single_open(file, jfs_loglevel_proc_show, NULL);
}

static ssize_t jfs_loglevel_proc_write(struct file *file,
        const char __user *buffer, size_t count, loff_t *ppos)
{
    char c;

    if (get_user(c, buffer))
        return -EFAULT;

    /* yes, I know this is an ASCIIism.  --hch */
    if (c < '0' || c > '9')
        return -EINVAL;
    jfsloglevel = c - '0';
    return count;
}

static const struct file_operations jfs_loglevel_proc_fops = {
    .owner      = THIS_MODULE,
    .open       = jfs_loglevel_proc_open,
    .read       = seq_read,
    .llseek     = seq_lseek,
    .release    = single_release,
    .write      = jfs_loglevel_proc_write,
};
#endif

static struct {
    const char  *name;
    const struct file_operations *proc_fops;
} Entries[] = {
#ifdef CONFIG_JFS_STATISTICS
    { "lmstats",    &jfs_lmstats_proc_fops, },
    { "txstats",    &jfs_txstats_proc_fops, },
    { "xtstat", &jfs_xtstat_proc_fops, },
    { "mpstat", &jfs_mpstat_proc_fops, },
#endif
#ifdef CONFIG_JFS_DEBUG
    { "TxAnchor",   &jfs_txanchor_proc_fops, },
    { "loglevel",   &jfs_loglevel_proc_fops }
#endif
};
#define NPROCENT    ARRAY_SIZE(Entries)

void jfs_proc_init(void)
{
    int i;

    if (!(base = proc_mkdir("fs/jfs", NULL)))
        return;

    for (i = 0; i < NPROCENT; i++)
        proc_create(Entries[i].name, 0, base, Entries[i].proc_fops);
}

void jfs_proc_clean(void)
{
    int i;

    if (base) {
        for (i = 0; i < NPROCENT; i++)
            remove_proc_entry(Entries[i].name, base);
        remove_proc_entry("fs/jfs", NULL);
    }
}

#endif /* PROC_FS_JFS */