/*

 * Copyright (C) 1999, 2001 by Andries Brouwer

 * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o

 * Copyright (C) 2008 Karel Zak <kzak@redhat.com>

 *

 * This file may be redistributed under the terms of the

 * GNU Lesser General Public License.

 */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <string.h>

#include <stdint.h>

#include "superblocks.h"

struct reiserfs_super_block {

  uint32_t  rs_blocks_count;

  uint32_t  rs_free_blocks;

  uint32_t  rs_root_block;

  uint32_t  rs_journal_block;

  uint32_t  rs_journal_dev;

  uint32_t  rs_orig_journal_size;

  uint32_t  rs_dummy2[5];

  uint16_t  rs_blocksize;

  uint16_t  rs_dummy3[3];

  unsigned char rs_magic[12];

  uint32_t  rs_dummy4[5];

  unsigned char rs_uuid[16];

  char    rs_label[16];

} __attribute__((packed));

struct reiser4_super_block {

  unsigned char rs4_magic[16];

  uint8_t   rs4_dummy[3];

  uint8_t   rs4_blocksize;

  unsigned char rs4_uuid[16];

  unsigned char rs4_label[16];

  uint64_t  rs4_dummy2;

} __attribute__((packed));

static int probe_reiser(blkid_probe pr, const struct blkid_idmag *mag)

{

  const struct reiserfs_super_block *rs;

  unsigned int blocksize;

  rs = blkid_probe_get_sb(pr, mag, struct reiserfs_super_block);

  if (!rs)

    return errno ? -errno : 1;

  blocksize = le16_to_cpu(rs->rs_blocksize);

  /* The blocksize must be at least 512B */

  if ((blocksize >> 9) == 0)

    return 1;

  /* If the superblock is inside the journal, we have the wrong one */

  if (mag->kboff / (blocksize >> 9) > le32_to_cpu(rs->rs_journal_block) / 2)

    return 1;

  /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */

  if (mag->magic[6] == '2' || mag->magic[6] == '3') {

    if (*rs->rs_label)

      blkid_probe_set_label(pr,

          (unsigned char *) rs->rs_label,

          sizeof(rs->rs_label));

    blkid_probe_set_uuid(pr, rs->rs_uuid);

  }

  if (mag->magic[6] == '3')

    blkid_probe_set_version(pr, "JR");

  else if (mag->magic[6] == '2')

    blkid_probe_set_version(pr, "3.6");

  else

    blkid_probe_set_version(pr, "3.5");

  blkid_probe_set_fsblocksize(pr, blocksize);

  blkid_probe_set_block_size(pr, blocksize);

  return 0;

}

static int probe_reiser4(blkid_probe pr, const struct blkid_idmag *mag)

{

  const struct reiser4_super_block *rs4;

  unsigned int blocksize;

  rs4 = blkid_probe_get_sb(pr, mag, struct reiser4_super_block);

  if (!rs4)

    return errno ? -errno : 1;

  blocksize = rs4->rs4_blocksize * 256;

  if (*rs4->rs4_label)

    blkid_probe_set_label(pr, rs4->rs4_label, sizeof(rs4->rs4_label));

  blkid_probe_set_uuid(pr, rs4->rs4_uuid);

  blkid_probe_set_version(pr, "4");

  blkid_probe_set_fsblocksize(pr, blocksize);

  blkid_probe_set_block_size(pr, blocksize);

  return 0;

}

const struct blkid_idinfo reiser_idinfo =

{

  .name   = "reiserfs",

  .usage    = BLKID_USAGE_FILESYSTEM,

  .probefunc  = probe_reiser,

  .minsz    = 128 * 1024,

  .magics   =

  {

    { .magic = "ReIsErFs",  .len = 8, .kboff = 8,  .sboff = 0x34 },

    { .magic = "ReIsEr2Fs", .len = 9, .kboff = 64, .sboff = 0x34 },

    { .magic = "ReIsEr3Fs", .len = 9, .kboff = 64, .sboff = 0x34 },

    { .magic = "ReIsErFs",  .len = 8, .kboff = 64, .sboff = 0x34 },

    { .magic = "ReIsErFs",  .len = 8, .kboff =  8, .sboff = 20   },

    { NULL }

  }

};

const struct blkid_idinfo reiser4_idinfo =

{

  .name   = "reiser4",

  .usage    = BLKID_USAGE_FILESYSTEM,

  .probefunc  = probe_reiser4,

  .minsz    = 128 * 1024,

  .magics   =

  {

    { .magic = "ReIsEr4", .len = 7, .kboff = 64 },

    { NULL }

  }

};