1  /*
       2   * sgi partition parsing code
       3   *
       4   * Copyright (C) 2009 Karel Zak <kzak@redhat.com>
       5   *
       6   * This file may be redistributed under the terms of the
       7   * GNU Lesser General Public License.
       8   *
       9   */
      10  #include <stdio.h>
      11  #include <string.h>
      12  #include <stdlib.h>
      13  #include <stdint.h>
      14  
      15  #include "partitions.h"
      16  #include "pt-sgi.h"
      17  
      18  static int probe_sgi_pt(blkid_probe pr,
      19  		const struct blkid_idmag *mag __attribute__((__unused__)))
      20  {
      21  	struct sgi_disklabel *l;
      22  	struct sgi_partition *p;
      23  	blkid_parttable tab = NULL;
      24  	blkid_partlist ls;
      25  	int i;
      26  
      27  	l = (struct sgi_disklabel *) blkid_probe_get_sector(pr, 0);
      28  	if (!l) {
      29  		if (errno)
      30  			return -errno;
      31  		goto nothing;
      32  	}
      33  
      34  	if (!blkid_probe_verify_csum(pr, sgi_pt_checksum(l), 0)) {
      35  		DBG(LOWPROBE, ul_debug(
      36  			"detected corrupted sgi disk label -- ignore"));
      37  		goto nothing;
      38  	}
      39  
      40  	if (blkid_partitions_need_typeonly(pr))
      41  		/* caller does not ask for details about partitions */
      42  		return BLKID_PROBE_OK;
      43  
      44  	ls = blkid_probe_get_partlist(pr);
      45  	if (!ls)
      46  		goto nothing;
      47  
      48  	tab = blkid_partlist_new_parttable(ls, "sgi", 0);
      49  	if (!tab)
      50  		goto err;
      51  
      52  	for(i = 0, p = &l->partitions[0]; i < SGI_MAXPARTITIONS; i++, p++) {
      53  		uint32_t size = be32_to_cpu(p->num_blocks);
      54  		uint32_t start = be32_to_cpu(p->first_block);
      55  		uint32_t type = be32_to_cpu(p->type);
      56  		blkid_partition par;
      57  
      58  		if (!size) {
      59  			blkid_partlist_increment_partno(ls);
      60  			continue;
      61  		}
      62  		par = blkid_partlist_add_partition(ls, tab, start, size);
      63  		if (!par)
      64  			goto err;
      65  
      66  		blkid_partition_set_type(par, type);
      67  	}
      68  
      69  	return BLKID_PROBE_OK;
      70  
      71  nothing:
      72  	return BLKID_PROBE_NONE;
      73  err:
      74  	return -ENOMEM;
      75  }
      76  
      77  const struct blkid_idinfo sgi_pt_idinfo =
      78  {
      79  	.name		= "sgi",
      80  	.probefunc	= probe_sgi_pt,
      81  	.magics		=
      82  	{
      83  		{ .magic = "\x0B\xE5\xA9\x41", .len = 4	},
      84  		{ NULL }
      85  	}
      86  };
      87