160 lines
3.5 KiB
C
160 lines
3.5 KiB
C
/*
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* sgi partition parsing code
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*
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* Copyright (C) 2009 Karel Zak <kzak@redhat.com>
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*
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* This file may be redistributed under the terms of the
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* GNU Lesser General Public License.
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include "partitions.h"
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#define SGI_MAXPARTITIONS 16
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/* partition type */
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#define SGI_TYPE_VOLHDR 0x00
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#define SGI_TYPE_VOLULME 0x06 /* entire disk */
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struct sgi_device_parameter {
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unsigned char skew;
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unsigned char gap1;
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unsigned char gap2;
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unsigned char sparecyl;
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uint16_t pcylcount;
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uint16_t head_vol0;
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uint16_t ntrks; /* tracks in cyl 0 or vol 0 */
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unsigned char cmd_tag_queue_depth;
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unsigned char unused0;
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uint16_t unused1;
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uint16_t nsect; /* sectors/tracks in cyl 0 or vol 0 */
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uint16_t bytes;
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uint16_t ilfact;
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uint32_t flags; /* controller flags */
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uint32_t datarate;
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uint32_t retries_on_error;
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uint32_t ms_per_word;
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uint16_t xylogics_gap1;
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uint16_t xylogics_syncdelay;
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uint16_t xylogics_readdelay;
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uint16_t xylogics_gap2;
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uint16_t xylogics_readgate;
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uint16_t xylogics_writecont;
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} __attribute__((packed));
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struct sgi_disklabel {
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uint32_t magic; /* magic number */
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uint16_t root_part_num; /* # root partition */
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uint16_t swap_part_num; /* # swap partition */
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unsigned char boot_file[16]; /* name of boot file */
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struct sgi_device_parameter devparam; /* not used now */
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struct sgi_volume {
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unsigned char name[8]; /* name of volume */
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uint32_t block_num; /* logical block number */
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uint32_t num_bytes; /* how big, in bytes */
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} __attribute__((packed)) volume[15];
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struct sgi_partition {
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uint32_t num_blocks; /* size in logical blocks */
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uint32_t first_block; /* first logical block */
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uint32_t type; /* type of this partition */
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} __attribute__((packed)) partitions[SGI_MAXPARTITIONS];
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/* checksum is the 32bit 2's complement sum of the disklabel */
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uint32_t csum; /* disk label checksum */
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uint32_t padding; /* padding */
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} __attribute__((packed));
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static uint32_t count_checksum(struct sgi_disklabel *label)
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{
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int i;
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uint32_t *ptr = (uint32_t *) label;
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uint32_t sum = 0;
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i = sizeof(*label) / sizeof(*ptr);
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while (i--)
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sum += be32_to_cpu(ptr[i]);
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return sum;
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}
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static int probe_sgi_pt(blkid_probe pr,
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const struct blkid_idmag *mag __attribute__((__unused__)))
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{
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struct sgi_disklabel *l;
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struct sgi_partition *p;
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blkid_parttable tab = NULL;
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blkid_partlist ls;
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int i;
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l = (struct sgi_disklabel *) blkid_probe_get_sector(pr, 0);
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if (!l)
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goto nothing;
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if (count_checksum(l)) {
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DBG(DEBUG_LOWPROBE, printf(
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"detected corrupted sgi disk label -- ignore\n"));
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goto nothing;
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}
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if (blkid_partitions_need_typeonly(pr))
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/* caller does not ask for details about partitions */
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return 0;
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ls = blkid_probe_get_partlist(pr);
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if (!ls)
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goto err;
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tab = blkid_partlist_new_parttable(ls, "sgi", 0);
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if (!tab)
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goto err;
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for(i = 0, p = &l->partitions[0]; i < SGI_MAXPARTITIONS; i++, p++) {
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uint32_t size = be32_to_cpu(p->num_blocks);
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uint32_t start = be32_to_cpu(p->first_block);
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uint32_t type = be32_to_cpu(p->type);
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blkid_partition par;
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if (size == 0 || type == SGI_TYPE_VOLULME ||
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type == SGI_TYPE_VOLHDR) {
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blkid_partlist_increment_partno(ls);
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continue;
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}
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par = blkid_partlist_add_partition(ls, tab, start, size);
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if (!par)
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goto err;
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blkid_partition_set_type(par, type);
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}
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return 0;
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nothing:
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return 1;
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err:
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return -1;
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}
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const struct blkid_idinfo sgi_pt_idinfo =
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{
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.name = "sgi",
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.probefunc = probe_sgi_pt,
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.magics =
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{
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{ .magic = "\x0B\xE5\xA9\x41", .len = 4 },
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{ NULL }
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}
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};
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