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Viewing changes to libblkid/src/superblocks/via_raid.c

  • Committer: Package Import Robot
  • Author(s): LaMont Jones
  • Date: 2011-11-03 15:38:23 UTC
  • mto: (4.5.5 sid) (1.6.4)
  • mto: This revision was merged to the branch mainline in revision 85.
  • Revision ID: package-import@ubuntu.com-20111103153823-10sx16jprzxlhkqf
Import upstream version 2.20.1

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libblkid/src/superblocks/via_raid.c
 
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/*
 
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 * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
 
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 *
 
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 * Inspired by libvolume_id by
 
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 *     Kay Sievers <kay.sievers@vrfy.org>
 
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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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#include <stdio.h>
 
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#include <stdlib.h>
 
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#include <unistd.h>
 
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#include <string.h>
 
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#include <errno.h>
 
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#include <ctype.h>
 
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#include <stdint.h>
 
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#include "superblocks.h"
 
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struct via_metadata {
 
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        uint16_t        signature;
 
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        uint8_t         version_number;
 
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        struct via_array {
 
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                uint16_t        disk_bit_mask;
 
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                uint8_t         disk_array_ex;
 
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                uint32_t        capacity_low;
 
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                uint32_t        capacity_high;
 
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                uint32_t        serial_checksum;
 
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        } __attribute__((packed)) array;
 
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        uint32_t        serial_checksum[8];
 
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        uint8_t         checksum;
 
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} __attribute__((packed));
 
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#define VIA_SIGNATURE           0xAA55
 
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/* 8 bit checksum on first 50 bytes of metadata. */
 
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static uint8_t via_checksum(struct via_metadata *v)
 
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{
 
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        uint8_t i = 50, cs = 0;
 
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        while (i--)
 
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                cs += ((uint8_t*) v)[i];
 
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        return cs == v->checksum;
 
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}
 
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static int probe_viaraid(blkid_probe pr,
 
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                const struct blkid_idmag *mag __attribute__((__unused__)))
 
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{
 
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        uint64_t off;
 
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        struct via_metadata *v;
 
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        if (pr->size < 0x10000)
 
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                return -1;
 
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        if (!S_ISREG(pr->mode) && !blkid_probe_is_wholedisk(pr))
 
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                return -1;
 
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        off = ((pr->size / 0x200)-1) * 0x200;
 
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        v = (struct via_metadata *)
 
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                        blkid_probe_get_buffer(pr,
 
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                                off,
 
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                                sizeof(struct via_metadata));
 
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        if (!v)
 
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                return -1;
 
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        if (le16_to_cpu(v->signature) != VIA_SIGNATURE)
 
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                return -1;
 
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        if (v->version_number > 2)
 
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                return -1;
 
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        if (!via_checksum(v))
 
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                return -1;
 
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        if (blkid_probe_sprintf_version(pr, "%u", v->version_number) != 0)
 
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                return -1;
 
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        if (blkid_probe_set_magic(pr, off,
 
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                                sizeof(v->signature),
 
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                                (unsigned char *) &v->signature))
 
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                return -1;
 
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        return 0;
 
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}
 
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const struct blkid_idinfo viaraid_idinfo = {
 
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        .name           = "via_raid_member",
 
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        .usage          = BLKID_USAGE_RAID,
 
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        .probefunc      = probe_viaraid,
 
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        .magics         = BLKID_NONE_MAGIC
 
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};
 
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