1  /*
       2   * Solaris x86 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  #include <stdio.h>
      10  #include <string.h>
      11  #include <stdlib.h>
      12  #include <stdint.h>
      13  
      14  #include "partitions.h"
      15  
      16  /*
      17   * Solaris-x86 is always within primary dos partition (nested PT table).  The
      18   * solaris-x86 vtoc can be used to split the entire partition to "slices". The
      19   * offset (start) of the slice is always relatively to the primary dos
      20   * partition.
      21   *
      22   * Note that Solaris-SPARC uses entire disk with a different partitioning
      23   * scheme.
      24   */
      25  
      26  /* some other implementation than Linux kernel assume 8 partitions only */
      27  #define SOLARIS_MAXPARTITIONS	16
      28  
      29  /* disklabel (vtoc) location  */
      30  #define SOLARIS_SECTOR		1			/* in 512-sectors */
      31  #define SOLARIS_OFFSET		(SOLARIS_SECTOR << 9)	/* in bytes */
      32  #define SOLARIS_MAGICOFFSET	(SOLARIS_OFFSET + 12)	/* v_sanity offset in bytes */
      33  
      34  /* slice tags */
      35  #define SOLARIS_TAG_WHOLEDISK	5
      36  
      37  struct solaris_slice {
      38  	uint16_t s_tag;      /* ID tag of partition */
      39  	uint16_t s_flag;     /* permission flags */
      40  	uint32_t s_start;    /* start sector no of partition */
      41  	uint32_t s_size;     /* # of blocks in partition */
      42  } __attribute__((packed));
      43  
      44  struct solaris_vtoc {
      45  	unsigned int v_bootinfo[3];     /* info needed by mboot (unsupported) */
      46  
      47  	uint32_t     v_sanity;          /* to verify vtoc sanity */
      48  	uint32_t     v_version;         /* layout version */
      49  	char         v_volume[8];       /* volume name */
      50  	uint16_t     v_sectorsz;        /* sector size in bytes */
      51  	uint16_t     v_nparts;          /* number of partitions */
      52  	unsigned int v_reserved[10];    /* free space */
      53  
      54  	struct solaris_slice v_slice[SOLARIS_MAXPARTITIONS]; /* slices */
      55  
      56  	unsigned int timestamp[SOLARIS_MAXPARTITIONS]; /* timestamp (unsupported) */
      57  	char         v_asciilabel[128];	/* for compatibility */
      58  } __attribute__((packed));
      59  
      60  static int probe_solaris_pt(blkid_probe pr,
      61  		const struct blkid_idmag *mag __attribute__((__unused__)))
      62  {
      63  	struct solaris_vtoc *l;	/* disk label */
      64  	struct solaris_slice *p;	/* partition */
      65  	blkid_parttable tab = NULL;
      66  	blkid_partition parent;
      67  	blkid_partlist ls;
      68  	int i;
      69  	uint16_t nparts;
      70  
      71  	l = (struct solaris_vtoc *) blkid_probe_get_sector(pr, SOLARIS_SECTOR);
      72  	if (!l) {
      73  		if (errno)
      74  			return -errno;
      75  		goto nothing;
      76  	}
      77  
      78  	if (le32_to_cpu(l->v_version) != 1) {
      79  		DBG(LOWPROBE, ul_debug(
      80  			"WARNING: unsupported solaris x86 version %d, ignore",
      81  			le32_to_cpu(l->v_version)));
      82  		goto nothing;
      83  	}
      84  
      85  	if (blkid_partitions_need_typeonly(pr))
      86  		/* caller does not ask for details about partitions */
      87  		return BLKID_PROBE_OK;
      88  
      89  	ls = blkid_probe_get_partlist(pr);
      90  	if (!ls)
      91  		goto nothing;
      92  
      93  	parent = blkid_partlist_get_parent(ls);
      94  
      95  	tab = blkid_partlist_new_parttable(ls, "solaris", SOLARIS_OFFSET);
      96  	if (!tab)
      97  		goto err;
      98  
      99  	nparts = le16_to_cpu(l->v_nparts);
     100  	if (nparts > SOLARIS_MAXPARTITIONS)
     101  		nparts = SOLARIS_MAXPARTITIONS;
     102  
     103  	for (i = 1, p = &l->v_slice[0];	i < nparts; i++, p++) {
     104  
     105  		uint32_t start = le32_to_cpu(p->s_start);
     106  		uint32_t size = le32_to_cpu(p->s_size);
     107  		blkid_partition par;
     108  
     109  		if (size == 0 || le16_to_cpu(p->s_tag) == SOLARIS_TAG_WHOLEDISK)
     110  			continue;
     111  
     112  		if (parent)
     113  			/* Solaris slices are relative to the parent (primary
     114  			 * DOS partition) */
     115  			start += blkid_partition_get_start(parent);
     116  
     117  		if (parent && !blkid_is_nested_dimension(parent, start, size)) {
     118  			DBG(LOWPROBE, ul_debug(
     119  				"WARNING: solaris partition (%d) overflow "
     120  				"detected, ignore", i));
     121  			continue;
     122  		}
     123  
     124  		par = blkid_partlist_add_partition(ls, tab, start, size);
     125  		if (!par)
     126  			goto err;
     127  
     128  		blkid_partition_set_type(par, le16_to_cpu(p->s_tag));
     129  		blkid_partition_set_flags(par, le16_to_cpu(p->s_flag));
     130  	}
     131  
     132  	return BLKID_PROBE_OK;
     133  
     134  nothing:
     135  	return BLKID_PROBE_NONE;
     136  err:
     137  	return -ENOMEM;
     138  }
     139  
     140  const struct blkid_idinfo solaris_x86_pt_idinfo =
     141  {
     142  	.name		= "solaris",
     143  	.probefunc	= probe_solaris_pt,
     144  	.magics		=
     145  	{
     146  		{
     147  		  .magic = "\xEE\xDE\x0D\x60",	/* little-endian magic string */
     148  		  .len = 4,			/* v_sanity size in bytes */
     149  		  .sboff = SOLARIS_MAGICOFFSET	/* offset of v_sanity */
     150  		},
     151  		{ NULL }
     152  	}
     153  };
     154