Re: insmod: /lib/modules/2.2.17/block/xd.o: init_module: Device or resource busy

["Edouard G. Parmelan" <egp@free.fr>]

Thomas NOEL wrote:

> Maintenant, comment faire pour détecter d'où vient la demande d'accès à
> /dev/xd* ? Je pense qu'il faudrait que tu épluches les logs un peu plus,
> sans passer par logcheck... Bon courage quoi ;)

Ecrire un module pour le block-major-13 qui trace via kprintf() le petit
nom du process qui essaye de faire un open().

A compiler avec

    gcc -c -DMODULE -D__KERNEL__ -I/usr/src/kernel-source-2.2.17 trace.c

Ensuite, soit tu le places dans /lib/modules/2.2.17/... soit tu le
charges directement par un `insmod trace major=13'.

J'ai fait le insmod suivi de wc /dev/xda, voici le résultat d'un dmesg:

    trace: log activated for major number 13
    trace: process 917 wc try open block major 13

C'est tout fait, en directe live !  Et il fonctionne avec ma 2.2.17.
-- 
Edouard G. Parmelan
http://egp.free.fr

/*
 * Copyright (C) 2000 Edouard G. Parmelan
 *
 * 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, 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/module.h>
#include <linux/fs.h>
#include <linux/sched.h>

static int major = 13;

MODULE_AUTHOR("Edouard G. Parmelan <egp@free.fr>");
MODULE_PARM(major, "i");
MODULE_PARM_DESC(major, "major number");


static int trace_open (struct inode *inode, struct file *file)
{
    struct task_struct *tsk = current;
    
    printk (KERN_INFO "trace: process %d %s try open block major %d\n",
	    tsk->pid, tsk->comm, major);
    return -ENODEV;
}

static struct file_operations trace_fops = {
    open: trace_open
};

int init_module(void)
{
    int error;

    if (register_blkdev (major, "trace", &trace_fops)) {
	printk (KERN_ERR "trace: Unable to get major number %d\n", major);
	return -1;
    }
    printk (KERN_INFO "trace: log activated for major number %d\n", major);

    return 0;
}

void cleanup_module (void)
{
    unregister_blkdev (major, "trace");
}