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/* Get the disklabel from a device node
Copyright (C) 1996,99,2001 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.org>
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 <device/disk_status.h>
#include <hurd/store.h>
/* XXX Ick. */
#define IOCPARM_MASK 0x1fff/* parameter length, at most 13 bits */
#define IOC_OUT 0x40000000/* copy out parameters */
#define _IOC(inout,group,num,len) \
(inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num))
#define _IOR(g,n,t) _IOC(IOC_OUT,(g), (n), sizeof(t))
static error_t
fd_get_device (int fd, device_t *device)
{
error_t err;
struct store *store;
file_t node = getdport (fd);
if (node == MACH_PORT_NULL)
return errno;
err = store_create (node, 0, 0, &store); /* consumes NODE on success */
if (! err)
{
if (store->class->id != STORAGE_DEVICE
/* In addition to requiring a device, we also want the *whole*
device -- one contiguous run starting at 0. */
|| store->num_runs != 1
|| store->runs[0].start != 0)
err = ENODEV;
else if (store->port == MACH_PORT_NULL)
/* Usually getting a null port back means we didn't have sufficient
privileges. */
err = EPERM;
else
{
*device = store->port;
store->port = MACH_PORT_NULL; /* Steal the port from STORE! */
}
store_free (store);
}
else
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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