source: MondoRescue/branches/3.3/mindi-busybox/util-linux/volume_id/sysv.c@ 3621

/*
 * volume_id - reads filesystem label and uuid
 *
 * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_SYSV) += sysv.o

//config:
//config:config FEATURE_VOLUMEID_SYSV
//config:   bool "sysv filesystem"
//config:   default y
//config:   depends on VOLUMEID
//config:   help
//config:     TODO
//config:

#include "volume_id_internal.h"

#define SYSV_NICINOD            100
#define SYSV_NICFREE            50

struct sysv_super {
    uint16_t    s_isize;
    uint16_t    s_pad0;
    uint32_t    s_fsize;
    uint16_t    s_nfree;
    uint16_t    s_pad1;
    uint32_t    s_free[SYSV_NICFREE];
    uint16_t    s_ninode;
    uint16_t    s_pad2;
    uint16_t    s_inode[SYSV_NICINOD];
    uint8_t     s_flock;
    uint8_t     s_ilock;
    uint8_t     s_fmod;
    uint8_t     s_ronly;
    uint32_t    s_time;
    uint16_t    s_dinfo[4];
    uint32_t    s_tfree;
    uint16_t    s_tinode;
    uint16_t    s_pad3;
    uint8_t     s_fname[6];
    uint8_t     s_fpack[6];
    uint32_t    s_fill[12];
    uint32_t    s_state;
    uint32_t    s_magic;
    uint32_t    s_type;
} PACKED;

#define XENIX_NICINOD               100
#define XENIX_NICFREE               100

struct xenix_super {
    uint16_t    s_isize;
    uint32_t    s_fsize;
    uint16_t    s_nfree;
    uint32_t    s_free[XENIX_NICFREE];
    uint16_t    s_ninode;
    uint16_t    s_inode[XENIX_NICINOD];
    uint8_t     s_flock;
    uint8_t     s_ilock;
    uint8_t     s_fmod;
    uint8_t     s_ronly;
    uint32_t    s_time;
    uint32_t    s_tfree;
    uint16_t    s_tinode;
    uint16_t    s_dinfo[4];
    uint8_t     s_fname[6];
    uint8_t     s_fpack[6];
    uint8_t     s_clean;
    uint8_t     s_fill[371];
    uint32_t    s_magic;
    uint32_t    s_type;
} PACKED;

#define SYSV_SUPERBLOCK_BLOCK           0x01
#define SYSV_MAGIC              0xfd187e20
#define XENIX_SUPERBLOCK_BLOCK          0x18
#define XENIX_MAGIC             0x2b5544
#define SYSV_MAX_BLOCKSIZE          0x800

int FAST_FUNC volume_id_probe_sysv(struct volume_id *id /*,uint64_t off*/)
{
#define off ((uint64_t)0)
    struct sysv_super *vs;
    struct xenix_super *xs;
    unsigned boff;

    dbg("probing at offset 0x%llx", (unsigned long long) off);

    for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
        vs = volume_id_get_buffer(id, off + (boff * SYSV_SUPERBLOCK_BLOCK), 0x200);
        if (vs == NULL)
            return -1;

        if (vs->s_magic == cpu_to_le32(SYSV_MAGIC) || vs->s_magic == cpu_to_be32(SYSV_MAGIC)) {
//          volume_id_set_label_raw(id, vs->s_fname, 6);
            volume_id_set_label_string(id, vs->s_fname, 6);
            IF_FEATURE_BLKID_TYPE(id->type = "sysv");
            goto found;
        }
    }

    for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
        xs = volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200);
        if (xs == NULL)
            return -1;

        if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) {
//          volume_id_set_label_raw(id, xs->s_fname, 6);
            volume_id_set_label_string(id, xs->s_fname, 6);
            IF_FEATURE_BLKID_TYPE(id->type = "xenix";)
            goto found;
        }
    }

    return -1;

 found:
//  volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
    return 0;
}