fs/jfs/jfs.c

	jfs.c revision 7e7bd3dccbfe8f79e25e5c1554b5bc3a9aaca321
/*
    libparted - a library for manipulating disk partitions
    Copyright (C) 2001, 2007 Free Software Foundation, Inc.

    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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
*/

#include <config.h>

#include <parted/parted.h>
#include <parted/endian.h>

#define _JFS_UTILITY
#include "jfs_types.h"
#include "jfs_superblock.h"

#define JFS_SUPER_SECTOR 64

#if ENABLE_NLS
#  include <libintl.h>
#  define _(String) dgettext (PACKAGE, String)
#else
#  define _(String) (String)
#endif /* ENABLE_NLS */

#define JFS_BLOCK_SIZES		((int[2]){512, 0})

static PedGeometry*
jfs_probe (PedGeometry* geom)
{
	union {
		struct superblock	sb;
		char			bytes[512];
	} buf;

	if (geom->length < JFS_SUPER_SECTOR + 1)
		return NULL;
	if (!ped_geometry_read (geom, &buf, JFS_SUPER_SECTOR, 1))
		return NULL;

	if (strncmp (buf.sb.s_magic, JFS_MAGIC, 4) == 0) {
		PedSector block_size = PED_LE32_TO_CPU (buf.sb.s_pbsize) / 512;
		PedSector block_count = PED_LE64_TO_CPU (buf.sb.s_size);

		return ped_geometry_new (geom->dev, geom->start,
					 block_size * block_count);
	} else {
		return NULL;
	}
}

#ifndef DISCOVER_ONLY
static int
jfs_clobber (PedGeometry* geom)
{
	char	buf[512];

	memset (buf, 0, 512);
	return ped_geometry_write (geom, buf, JFS_SUPER_SECTOR, 1);
}
#endif /* !DISCOVER_ONLY */

static PedFileSystemOps jfs_ops = {
	.probe =		jfs_probe,
#ifndef DISCOVER_ONLY
	.clobber =	jfs_clobber,
#else
	.clobber =	NULL,
#endif
	.open =		NULL,
	.create =		NULL,
	.close =		NULL,
	.check =		NULL,
	.copy =		NULL,
	.resize =		NULL,
	.get_create_constraint =	NULL,
	.get_resize_constraint =	NULL,
	.get_copy_constraint =	NULL
};

static PedFileSystemType jfs_type = {
	.next =	NULL,
	.ops =	&jfs_ops,
	.name =	"jfs",
	.block_sizes = JFS_BLOCK_SIZES
};

void
ped_file_system_jfs_init ()
{
	ped_file_system_type_register (&jfs_type);
}

void
ped_file_system_jfs_done ()
{
	ped_file_system_type_unregister (&jfs_type);
}