From accff726856a0b3258a413d823a534f4f437e6b2 Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Wed, 9 Nov 2005 15:08:45 +0100 Subject: volume_id: provide libvolume_id.a file Signed-off-by: Kay Sievers --- extras/volume_id/libvolume_id/linux_raid.c | 88 ++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+) create mode 100644 extras/volume_id/libvolume_id/linux_raid.c (limited to 'extras/volume_id/libvolume_id/linux_raid.c') diff --git a/extras/volume_id/libvolume_id/linux_raid.c b/extras/volume_id/libvolume_id/linux_raid.c new file mode 100644 index 0000000000..d90510a817 --- /dev/null +++ b/extras/volume_id/libvolume_id/linux_raid.c @@ -0,0 +1,88 @@ +/* + * volume_id - reads filesystem label and uuid + * + * Copyright (C) 2004 Kay Sievers + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation version 2 of the License. + */ + +#ifndef _GNU_SOURCE +#define _GNU_SOURCE 1 +#endif + +#ifdef HAVE_CONFIG_H +# include +#endif + +#include +#include +#include +#include +#include +#include + +#include "volume_id.h" +#include "logging.h" +#include "util.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; +} __attribute__((packed)) *mdp; + +#define MD_RESERVED_BYTES 0x10000 +#define MD_MAGIC 0xa92b4efc + +int volume_id_probe_linux_raid(struct volume_id *id, uint64_t off, uint64_t size) +{ + const uint8_t *buf; + uint64_t sboff; + uint8_t uuid[16]; + + 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; + buf = volume_id_get_buffer(id, off + sboff, 0x800); + if (buf == NULL) + return -1; + + mdp = (struct mdp_super_block *) buf; + + if (le32_to_cpu(mdp->md_magic) != MD_MAGIC) + return -1; + + memcpy(uuid, &mdp->set_uuid0, 4); + 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); + id->type = "linux_raid_member"; + + return 0; +} -- cgit v1.2.3-54-g00ecf