fs/jfs/jfs.c

/*
    libparted - a library for manipulating disk partitions
    Copyright (C) 2001, 2007, 2009-2010 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;

        /* FIXME: for now, don't even try to deal with larger sector size.  */
    if (geom->dev->sector_size != PED_SECTOR_SIZE_DEFAULT)
        return NULL;

    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);
}