busybox/util-linux/volume_id/linux_raid.c
Denys Vlasenko f560422fa0 Big cleanup in config help and description
Redundant help texts (one which only repeats the description)
are deleted.

Descriptions and help texts are trimmed.

Some config options are moved, even across menus.

No config option _names_ are changed.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-10 14:58:54 +01:00

89 lines
2.5 KiB
C

/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_LINUXRAID) += linux_raid.o
//config:config FEATURE_VOLUMEID_LINUXRAID
//config: bool "linuxraid"
//config: default y
//config: depends on VOLUMEID
#include "volume_id_internal.h"
struct mdp_super_block {
uint32_t md_magic;
uint32_t major_version;
uint32_t minor_version;
uint32_t patch_version;
uint32_t gvalid_words;
uint32_t set_uuid0;
uint32_t ctime;
uint32_t level;
uint32_t size;
uint32_t nr_disks;
uint32_t raid_disks;
uint32_t md_minor;
uint32_t not_persistent;
uint32_t set_uuid1;
uint32_t set_uuid2;
uint32_t set_uuid3;
} PACKED;
#define MD_RESERVED_BYTES 0x10000
#define MD_MAGIC 0xa92b4efc
int FAST_FUNC volume_id_probe_linux_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size)
{
typedef uint32_t aliased_uint32_t FIX_ALIASING;
#define off ((uint64_t)0)
uint64_t sboff;
uint8_t uuid[16];
struct mdp_super_block *mdp;
dbg("probing at offset 0x%llx, size 0x%llx",
(unsigned long long) off, (unsigned long long) size);
if (size < 0x10000)
return -1;
sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
mdp = volume_id_get_buffer(id, off + sboff, 0x800);
if (mdp == NULL)
return -1;
if (mdp->md_magic != cpu_to_le32(MD_MAGIC))
return -1;
*(aliased_uint32_t*)uuid = mdp->set_uuid0;
memcpy(&uuid[4], &mdp->set_uuid1, 12);
volume_id_set_uuid(id, uuid, UUID_DCE);
// snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
// le32_to_cpu(mdp->major_version),
// le32_to_cpu(mdp->minor_version),
// le32_to_cpu(mdp->patch_version));
dbg("found raid signature");
// volume_id_set_usage(id, VOLUME_ID_RAID);
IF_FEATURE_BLKID_TYPE(id->type = "linux_raid_member";)
return 0;
}