/*

 * Copyright (C) 1999 by Andries Brouwer

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

 * Copyright (C) 2001 by Andreas Dilger

 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>

 * 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 <errno.h>

#include <ctype.h>

#include <stdint.h>

#include "superblocks.h"

struct jfs_super_block {

  unsigned char js_magic[4];

  uint32_t  js_version;

  uint64_t  js_size;

  uint32_t  js_bsize; /* 4: aggregate block size in bytes */

  uint16_t  js_l2bsize; /* 2: log2 of s_bsize */

  uint16_t  js_l2bfactor; /* 2: log2(s_bsize/hardware block size) */

  uint32_t  js_pbsize;  /* 4: hardware/LVM block size in bytes */

  uint16_t  js_l2pbsize;  /* 2: log2 of s_pbsize */

  uint16_t  js_pad;   /* 2: padding necessary for alignment */

  uint32_t  js_dummy2[26];

  unsigned char js_uuid[16];

  unsigned char js_label[16];

  unsigned char js_loguuid[16];

};

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

{

  const struct jfs_super_block *js;

  js = blkid_probe_get_sb(pr, mag, struct jfs_super_block);

  if (!js)

    return errno ? -errno : 1;

  if (le16_to_cpu(js->js_l2bsize) > 31 || le16_to_cpu(js->js_l2pbsize) > 31)

    return 1;

  if (le32_to_cpu(js->js_bsize) != (1U << le16_to_cpu(js->js_l2bsize)))

    return 1;

  if (le32_to_cpu(js->js_pbsize) != (1U << le16_to_cpu(js->js_l2pbsize)))

    return 1;

  if ((le16_to_cpu(js->js_l2bsize) - le16_to_cpu(js->js_l2pbsize)) !=

      le16_to_cpu(js->js_l2bfactor))

    return 1;

  if (*((char *) js->js_label) != '\0')

    blkid_probe_set_label(pr, js->js_label, sizeof(js->js_label));

  blkid_probe_set_uuid(pr, js->js_uuid);

  blkid_probe_set_fsblocksize(pr, le32_to_cpu(js->js_bsize));

  blkid_probe_set_block_size(pr, le32_to_cpu(js->js_bsize));

  return 0;

}

const struct blkid_idinfo jfs_idinfo =

{

  .name   = "jfs",

  .usage    = BLKID_USAGE_FILESYSTEM,

  .probefunc  = probe_jfs,

  .minsz    = 16 * 1024 * 1024,

  .magics   =

  {

    { .magic = "JFS1", .len = 4, .kboff = 32 },

    { NULL }

  }

};