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/* Partition store backend
Copyright (C) 2001, 2002 Free Software Foundation, Inc.
Written by Neal H Walfield <neal@cs.uml.edu>
This file is part of the GNU Hurd.
The GNU Hurd 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.
The GNU Hurd 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, USA. */
#include "store.h"
#include <stdlib.h>
#include <errno.h>
#include <assert.h>
#include <cthreads.h>
#include <parted/parted.h>
#include <parted/device_gnu.h>
#include <string.h>
#include <error.h>
#define NEED_PARTED_VERSION "1.5.4"
/* Return a new store in STORE which contains a remap store of partition
PART from the contents of SOURCE; SOURCE is consumed. */
error_t
store_part_create (struct store *source, int index, int flags,
struct store **store)
{
static struct mutex parted_lock = MUTEX_INITIALIZER;
static int version_check;
error_t err = 0;
PedDevice *dev;
PedDisk *disk;
PedPartition *part;
struct store_run run;
if ((source->block_size < PED_SECTOR_SIZE
&& PED_SECTOR_SIZE % source->block_size != 0)
|| (source->block_size > PED_SECTOR_SIZE
&& source->block_size % PED_SECTOR_SIZE != 0))
return EINVAL;
mutex_lock (&parted_lock);
/* Since Parted provides no source-level information about
version compatibility, we have to check at run time. */
if (version_check == 0)
{
const char *version = ped_get_version ();
version_check = -1;
if (version == 0)
error (0, 0, "cannot get version of Parted library!");
else if (strverscmp (version, NEED_PARTED_VERSION) < 0)
error (0, 0, "Parted library version %s older than needed %s",
version, NEED_PARTED_VERSION);
else
version_check = 1;
}
if (version_check <= 0)
{
error (0, 0, "the `part' store type is not available");
mutex_unlock (&parted_lock);
return ENOTSUP;
}
ped_exception_fetch_all ();
dev = ped_device_new_from_store (source);
if (! dev)
{
ped_exception_catch ();
err = EIO;
goto out;
}
assert (ped_device_open (dev) != 0);
disk = ped_disk_new (dev);
if (! disk)
{
ped_exception_catch ();
err = EIO;
goto out_with_dev;
}
for (part = ped_disk_next_partition (disk, NULL); part;
part = ped_disk_next_partition (disk, part))
{
if (part->type != PED_PARTITION_LOGICAL
&& part->type != 0 /* PED_PARTITION_PRIMARY */)
continue;
assert (part->num);
if (part->num == index)
break;
}
if (! part)
{
err = EIO;
goto out_with_disk;
}
if (source->block_size == PED_SECTOR_SIZE)
{
run.start = part->geom.start;
run.length = part->geom.length;
}
else if (source->block_size < PED_SECTOR_SIZE)
{
run.start = part->geom.start * (PED_SECTOR_SIZE / source->block_size);
run.length = part->geom.length * (PED_SECTOR_SIZE / source->block_size);
}
else
/* source->block_size > PED_SECTOR_SIZE */
{
run.start = part->geom.start * PED_SECTOR_SIZE;
if (run.start % source->block_size != 0)
err = EIO;
else
{
run.start /= source->block_size;
run.length = part->geom.length * PED_SECTOR_SIZE;
if (run.length % source->block_size != 0)
err = EIO;
else
run.length /= source->block_size;
}
}
out_with_disk:
assert (ped_device_close (dev) != 0);
assert (ped_disk_destroy (disk));
out_with_dev:
ped_device_destroy (dev);
out:
ped_exception_leave_all ();
mutex_unlock (&parted_lock);
if (! err)
err = store_remap (source, &run, 1, store);
return err;
}
/* Open the part NAME. NAME consists of a partition number, a ':', a another
store class name, a ':' and a name for to by passed to the store class.
E.g. "2:device:hd0" would open the second partition on a DEVICE store
named "hd0". FLAGS indicate how to open the store. CLASSES is used to
select classes specified by the type NAME; if it is 0, STORE_STD_CLASSES
is used. The new store is returned in *STORE. */
error_t
store_part_open (const char *name, int flags,
const struct store_class *const *classes,
struct store **store)
{
int part;
char *endp;
struct store *source;
error_t err;
part = strtol (name, &endp, 0);
if (endp == name || *endp != ':')
return EINVAL;
name = endp + 1;
if (*name == '\0')
return EINVAL;
err = store_typed_open (name, flags, classes, &source);
if (! err)
{
err = store_part_create (source, part, flags, store);
if (err)
store_free (source);
}
return err;
}
const struct store_class
store_part_class = { -1, "part", open: store_part_open };
STORE_STD_CLASS (part);
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