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/*
* Copyright (C) 2015 by Philipp Marek <philipp.marek@linbit.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*
* DRBD is a blocklevel replication solution in the Linux kernel,
* upstream since 2.6.33. (See http://drbd.linbit.com/)
* DRBDmanage is a configuration frontend that assists in
* creating/deleting/modifying DRBD resources across multiple machines
* (a DRBDmanage "cluster"); this file detects its control volume,
* which is replicated (via DRBD 9) on some of the nodes.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <inttypes.h>
#include <stddef.h>
#include "bitops.h"
#include "superblocks.h"
struct drbdmanage_hdr {
unsigned char magic[11];
unsigned char uuid[32];
unsigned char lf;
} __attribute__ ((packed));
struct drbdmanage_pers {
char magic[4];
uint32_t version_le;
} __attribute__ ((packed));
static const char persistence_magic[4] = { '\x1a', '\xdb', '\x98', '\xa2' };
static int probe_drbdmanage(blkid_probe pr,
const struct blkid_idmag *mag __attribute__((__unused__)))
{
struct drbdmanage_hdr *hdr;
unsigned char *cp;
struct drbdmanage_pers *prs;
hdr = (struct drbdmanage_hdr*)
blkid_probe_get_buffer(pr, 0, sizeof(*hdr));
if (!hdr)
return errno ? -errno : 1;
for(cp=hdr->uuid; cp<&hdr->lf; cp++)
if (!isxdigit(*cp))
return 1;
if (hdr->lf != '\n')
return 1;
if (blkid_probe_set_id_label(pr, "UUID",
hdr->uuid, sizeof(hdr->uuid)))
return errno ? -errno : 1;
prs = (struct drbdmanage_pers*)
blkid_probe_get_buffer(pr, 0x1000, sizeof(*prs));
if (!prs)
return errno ? -errno : 1;
if (memcmp(prs->magic, persistence_magic, sizeof(prs->magic)) == 0 &&
blkid_probe_sprintf_version(pr, "%d", be32_to_cpu(prs->version_le)) != 0)
return errno ? -errno : 1;
return 0;
}
const struct blkid_idinfo drbdmanage_idinfo =
{
.name = "drbdmanage_control_volume",
.usage = BLKID_USAGE_OTHER,
.probefunc = probe_drbdmanage,
.minsz = 64 * 1024,
.magics = {
{ .magic = "$DRBDmgr=q", .len = 10, .sboff = 0 },
{ NULL }
},
};
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