1  /*
       2   * Copyright (C) 1999 by Andries Brouwer
       3   * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
       4   * Copyright (C) 2001 by Andreas Dilger
       5   * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
       6   * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
       7   *
       8   * This file may be redistributed under the terms of the
       9   * GNU Lesser General Public License.
      10   */
      11  #include <stdio.h>
      12  #include <stdlib.h>
      13  #include <unistd.h>
      14  #include <string.h>
      15  #include <errno.h>
      16  #include <ctype.h>
      17  #include <stdint.h>
      18  
      19  #include "superblocks.h"
      20  
      21  struct jfs_super_block {
      22  	unsigned char	js_magic[4];
      23  	uint32_t	js_version;
      24  	uint64_t	js_size;
      25  	uint32_t	js_bsize;	/* 4: aggregate block size in bytes */
      26  	uint16_t	js_l2bsize;	/* 2: log2 of s_bsize */
      27  	uint16_t	js_l2bfactor;	/* 2: log2(s_bsize/hardware block size) */
      28  	uint32_t	js_pbsize;	/* 4: hardware/LVM block size in bytes */
      29  	uint16_t	js_l2pbsize;	/* 2: log2 of s_pbsize */
      30  	uint16_t	js_pad;		/* 2: padding necessary for alignment */
      31  	uint32_t	js_dummy2[26];
      32  	unsigned char	js_uuid[16];
      33  	unsigned char	js_label[16];
      34  	unsigned char	js_loguuid[16];
      35  };
      36  
      37  static int probe_jfs(blkid_probe pr, const struct blkid_idmag *mag)
      38  {
      39  	struct jfs_super_block *js;
      40  
      41  	js = blkid_probe_get_sb(pr, mag, struct jfs_super_block);
      42  	if (!js)
      43  		return errno ? -errno : 1;
      44  	if (le16_to_cpu(js->js_l2bsize) > 32 || le16_to_cpu(js->js_l2pbsize) > 32)
      45  		return 1;
      46  	if (le32_to_cpu(js->js_bsize) != (1U << le16_to_cpu(js->js_l2bsize)))
      47  		return 1;
      48  	if (le32_to_cpu(js->js_pbsize) != (1U << le16_to_cpu(js->js_l2pbsize)))
      49  		return 1;
      50  	if ((le16_to_cpu(js->js_l2bsize) - le16_to_cpu(js->js_l2pbsize)) !=
      51  	    le16_to_cpu(js->js_l2bfactor))
      52  		return 1;
      53  
      54  	if (*((char *) js->js_label) != '\0')
      55  		blkid_probe_set_label(pr, js->js_label, sizeof(js->js_label));
      56  	blkid_probe_set_uuid(pr, js->js_uuid);
      57  	blkid_probe_set_fsblocksize(pr, le32_to_cpu(js->js_bsize));
      58  	blkid_probe_set_block_size(pr, le32_to_cpu(js->js_bsize));
      59  	return 0;
      60  }
      61  
      62  
      63  const struct blkid_idinfo jfs_idinfo =
      64  {
      65  	.name		= "jfs",
      66  	.usage		= BLKID_USAGE_FILESYSTEM,
      67  	.probefunc	= probe_jfs,
      68  	.minsz		= 16 * 1024 * 1024,
      69  	.magics		=
      70  	{
      71  		{ .magic = "JFS1", .len = 4, .kboff = 32 },
      72  		{ NULL }
      73  	}
      74  };
      75