/* $Id$ */
/** @file
* Apps - VBoxVolInfo, Volume information tool.
*/
/*
* Copyright (C) 2012 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include <dirent.h>
extern "C"
{
#define private privatekw
#include <libdevmapper.h>
}
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
/*******************************************************************************
* Function Prototypes *
*******************************************************************************/
void print_dev_name(dev_t devid);
/*
* Extracts logical volume dependencies via devmapper API and print them out.
*/
int main(int argc, char **argv)
{
struct dm_task *dmtask;
struct dm_info dminfo;
if (argc != 2)
{
fprintf(stderr, "USAGE: %s <volume_name>\n", argv[0]);
return 1;
}
dmtask = dm_task_create(DM_DEVICE_DEPS);
if (!dmtask)
return 2;
if (dm_task_set_name(dmtask, argv[1]))
if (dm_task_run(dmtask))
if (dm_task_get_info(dmtask, &dminfo))
{
struct dm_deps *dmdeps = dm_task_get_deps(dmtask);
if (dmdeps)
{
unsigned i;
for (i = 0; i < dmdeps->count; ++i)
print_dev_name(dmdeps->device[i]);
}
}
dm_task_destroy(dmtask);
return 0;
}
/*
* Looks up device name by id using /dev directory. Prints it to stdout.
*/
void print_dev_name(dev_t devid)
{
char path[PATH_MAX];
struct dirent *de;
DIR *dir = opendir("/dev");
while ((de = readdir(dir)) != NULL)
{
struct stat st;
snprintf(path, sizeof(path), "/dev/%s", de->d_name);
if (!stat(path, &st))
if (S_ISBLK(st.st_mode))
if (devid == st.st_rdev)
{
puts(de->d_name);
break;
}
}
closedir(dir);
}