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/* Get the disklabel from a device node
Copyright (C) 1996 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <errno.h>
#include <hurd.h>
#include <mach.h>
#include <string.h>
#include <device/device.h>
#include <mach/sa/sys/ioctl.h> /* Ick */
#include <device/disk_status.h>
static error_t
fd_get_device (int fd, device_t *device)
{
error_t err;
string_t name;
int class, flags = 0;
size_t block_size;
off_t *runs = 0;
char *misc = 0;
size_t runs_len = 0, misc_len = 0;
file_t node = getdport (fd);
if (node == MACH_PORT_NULL)
return errno;
err = file_get_storage_info (node, &class, &runs, &runs_len, &block_size,
name, device, &misc, &misc_len, &flags);
if (!err)
{
if (runs_len != 2 || runs[0] != 0 || class != STORAGE_DEVICE)
/* This doesn't seem to be a handle on the whole device; be picky. */
err = ENODEV;
if (runs_len)
vm_deallocate (mach_task_self (), (vm_address_t)runs, runs_len);
if (misc_len)
vm_deallocate (mach_task_self (), (vm_address_t)misc, misc_len);
}
mach_port_deallocate (mach_task_self (), node);
return err;
}
error_t
fd_get_disklabel (int fd, struct disklabel *label)
{
device_t device;
error_t err = fd_get_device (fd, &device);
if (! err)
{
mach_msg_type_number_t label_len = sizeof *label / sizeof (integer_t);
err = device_get_status (device, DIOCGDINFO,
(dev_status_t)label, &label_len);
if (!err && label_len != sizeof *label / sizeof (integer_t))
err = ERANGE;
mach_port_deallocate (mach_task_self (), device);
}
return err;
}
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