1  /*
       2   * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
       3   *
       4   * Inspired by libvolume_id by
       5   *     Kay Sievers <kay.sievers@vrfy.org>
       6   *
       7   * This file may be redistributed under the terms of the
       8   * GNU Lesser General Public License.
       9   */
      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 via_metadata {
      22  	uint16_t	signature;
      23  	uint8_t		version_number;
      24  	struct via_array {
      25  		uint16_t	disk_bit_mask;
      26  		uint8_t		disk_array_ex;
      27  		uint32_t	capacity_low;
      28  		uint32_t	capacity_high;
      29  		uint32_t	serial_checksum;
      30  	} __attribute__((packed)) array;
      31  	uint32_t	serial_checksum[8];
      32  	uint8_t		checksum;
      33  } __attribute__((packed));
      34  
      35  #define VIA_SIGNATURE		0xAA55
      36  
      37  /* 8 bit checksum on first 50 bytes of metadata. */
      38  static uint8_t via_checksum(struct via_metadata *v)
      39  {
      40  	uint8_t i = 50, cs = 0;
      41  
      42  	while (i--)
      43  		cs += ((uint8_t*) v)[i];
      44  
      45  	return cs;
      46  }
      47  
      48  static int probe_viaraid(blkid_probe pr,
      49  		const struct blkid_idmag *mag __attribute__((__unused__)))
      50  {
      51  	uint64_t off;
      52  	struct via_metadata *v;
      53  
      54  	if (pr->size < 0x10000)
      55  		return 1;
      56  	if (!S_ISREG(pr->mode) && !blkid_probe_is_wholedisk(pr))
      57  		return 1;
      58  
      59  	off = ((pr->size / 0x200)-1) * 0x200;
      60  
      61  	v = (struct via_metadata *)
      62  			blkid_probe_get_buffer(pr,
      63  				off,
      64  				sizeof(struct via_metadata));
      65  	if (!v)
      66  		return errno ? -errno : 1;
      67  
      68  	if (le16_to_cpu(v->signature) != VIA_SIGNATURE)
      69  		return 1;
      70  	if (v->version_number > 2)
      71  		return 1;
      72  	if (!blkid_probe_verify_csum(pr, via_checksum(v), v->checksum))
      73  		return 1;
      74  
      75  	if (blkid_probe_sprintf_version(pr, "%u", v->version_number) != 0)
      76  		return 1;
      77  	if (blkid_probe_set_magic(pr, off,
      78  				sizeof(v->signature),
      79  				(unsigned char *) &v->signature))
      80  		return 1;
      81  	return 0;
      82  }
      83  
      84  const struct blkid_idinfo viaraid_idinfo = {
      85  	.name		= "via_raid_member",
      86  	.usage		= BLKID_USAGE_RAID,
      87  	.probefunc	= probe_viaraid,
      88  	.magics		= BLKID_NONE_MAGIC
      89  };
      90  
      91