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  #include <stdio.h>
      11  #include <stdlib.h>
      12  #include <unistd.h>
      13  #include <string.h>
      14  #include <errno.h>
      15  #include <ctype.h>
      16  #include <stdint.h>
      17  
      18  #include "superblocks.h"
      19  
      20  struct promise_metadata {
      21  	uint8_t	sig[24];
      22  };
      23  
      24  #define PDC_CONFIG_OFF		0x1200
      25  #define PDC_SIGNATURE		"Promise Technology, Inc."
      26  
      27  static int probe_pdcraid(blkid_probe pr,
      28  		const struct blkid_idmag *mag __attribute__((__unused__)))
      29  {
      30  	size_t i;
      31  	static unsigned int sectors[] = {
      32  	  63, 255, 256, 16, 399, 591, 675, 735, 911, 974, 991, 951, 3087
      33  	};
      34  	uint64_t nsectors;
      35  
      36  	if (pr->size < 0x40000)
      37  		return 1;
      38  	if (!S_ISREG(pr->mode) && !blkid_probe_is_wholedisk(pr))
      39  		return 1;
      40  
      41  	nsectors = pr->size >> 9;
      42  
      43  	for (i = 0; i < ARRAY_SIZE(sectors); i++) {
      44  		uint64_t off;
      45  		struct promise_metadata *pdc;
      46  
      47  		if (nsectors < sectors[i])
      48  			return 1;
      49  
      50  		off = (nsectors - sectors[i]) << 9;
      51  		pdc = (struct promise_metadata *)
      52  				blkid_probe_get_buffer(pr,
      53  					off,
      54  					sizeof(struct promise_metadata));
      55  		if (!pdc)
      56  			return errno ? -errno : 1;
      57  
      58  		if (memcmp(pdc->sig, PDC_SIGNATURE,
      59  				sizeof(PDC_SIGNATURE) - 1) == 0) {
      60  
      61  			if (blkid_probe_set_magic(pr, off, sizeof(pdc->sig),
      62  						(unsigned char *) pdc->sig))
      63  				return 1;
      64  			return 0;
      65  		}
      66  	}
      67  	return 1;
      68  }
      69  
      70  const struct blkid_idinfo pdcraid_idinfo = {
      71  	.name		= "promise_fasttrack_raid_member",
      72  	.usage		= BLKID_USAGE_RAID,
      73  	.probefunc	= probe_pdcraid,
      74  	.magics		= BLKID_NONE_MAGIC
      75  };
      76  
      77