release/src/router/busybox/util-linux/volume_id/unused_promise_raid.c

   1 /*
   2  * volume_id - reads filesystem label and uuid
   3  *
   4  * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
   5  *
   6  *      This library is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU Lesser General Public
   8  *      License as published by the Free Software Foundation; either
   9  *      version 2.1 of the License, or (at your option) any later version.
  10  *
  11  *      This library is distributed in the hope that it will be useful,
  12  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14  *      Lesser General Public License for more details.
  15  *
  16  *      You should have received a copy of the GNU Lesser General Public
  17  *      License along with this library; if not, write to the Free Software
  18  *      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  */
  20
  21 //kbuild:### lib-$(CONFIG_FEATURE_VOLUMEID_PROMISERAID) += promise_raid.o
  22
  23 //config:
  24 //config:### config FEATURE_VOLUMEID_PROMISERAID
  25 //config:###    bool "promise raid"
  26 //config:###    default y
  27 //config:###    depends on VOLUMEID
  28 //config:###    help
  29 //config:###      TODO
  30 //config:
  31
  32 #include "volume_id_internal.h"
  33
  34 struct promise_meta {
  35         uint8_t sig[24];
  36 } PACKED;
  37
  38 #define PDC_CONFIG_OFF          0x1200
  39 #define PDC_SIGNATURE           "Promise Technology, Inc."
  40
  41 int FAST_FUNC volume_id_probe_promise_fasttrack_raid(struct volume_id *id, uint64_t off, uint64_t size)
  42 {
  43         static const unsigned short sectors[] = {
  44                 63, 255, 256, 16, 399
  45         };
  46
  47         struct promise_meta *pdc;
  48         unsigned i;
  49
  50         dbg("probing at offset 0x%llx, size 0x%llx",
  51             (unsigned long long) off, (unsigned long long) size);
  52
  53         if (size < 0x40000)
  54                 return -1;
  55
  56         for (i = 0; i < ARRAY_SIZE(sectors); i++) {
  57                 uint64_t meta_off;
  58
  59                 meta_off = ((size / 0x200) - sectors[i]) * 0x200;
  60                 pdc = volume_id_get_buffer(id, off + meta_off, 0x200);
  61                 if (pdc == NULL)
  62                         return -1;
  63
  64                 if (memcmp(pdc->sig, PDC_SIGNATURE, sizeof(PDC_SIGNATURE)-1) == 0)
  65                         goto found;
  66         }
  67         return -1;
  68
  69  found:
  70 //      volume_id_set_usage(id, VOLUME_ID_RAID);
  71 //      id->type = "promise_fasttrack_raid_member";
  72
  73         return 0;
  74 }