118 lines
2.6 KiB
C
118 lines
2.6 KiB
C
/*
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* Copyright (C) 2009 by Bastian Friedrich <bastian.friedrich@collax.com>
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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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* defines, structs taken from drbd source; file names represent drbd source
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* files.
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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 <inttypes.h>
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#include <stddef.h>
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#include "superblocks.h"
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/*
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* drbd/linux/drbd.h
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*/
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#define DRBD_MAGIC 0x83740267
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/*
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* user/drbdmeta.c
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* We only support v08 for now
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*/
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#define DRBD_MD_MAGIC_08 (DRBD_MAGIC+4)
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#define DRBD_MD_MAGIC_84_UNCLEAN (DRBD_MAGIC+5)
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/*
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* drbd/linux/drbd.h
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*/
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enum drbd_uuid_index {
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UI_CURRENT,
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UI_BITMAP,
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UI_HISTORY_START,
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UI_HISTORY_END,
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UI_SIZE, /* nl-packet: number of dirty bits */
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UI_FLAGS, /* nl-packet: flags */
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UI_EXTENDED_SIZE /* Everything. */
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};
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/*
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* user/drbdmeta.c
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* Minor modifications wrt. types
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*/
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struct md_on_disk_08 {
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uint64_t la_sect; /* last agreed size. */
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uint64_t uuid[UI_SIZE]; /* UUIDs */
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uint64_t device_uuid;
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uint64_t reserved_u64_1;
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uint32_t flags;
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uint32_t magic;
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uint32_t md_size_sect;
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int32_t al_offset; /* signed sector offset to this block */
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uint32_t al_nr_extents; /* important for restoring the AL */
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int32_t bm_offset; /* signed sector offset to the bitmap, from here */
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uint32_t bm_bytes_per_bit;
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uint32_t reserved_u32[4];
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char reserved[8 * 512 - (8*(UI_SIZE+3)+4*11)];
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};
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static int probe_drbd(blkid_probe pr,
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const struct blkid_idmag *mag __attribute__((__unused__)))
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{
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struct md_on_disk_08 *md;
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off_t off;
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off = pr->size - sizeof(*md);
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/* Small devices cannot be drbd (?) */
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if (pr->size < 0x10000)
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return -1;
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md = (struct md_on_disk_08 *)
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blkid_probe_get_buffer(pr,
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off,
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sizeof(struct md_on_disk_08));
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if (!md)
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return -1;
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if (be32_to_cpu(md->magic) != DRBD_MD_MAGIC_08 &&
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be32_to_cpu(md->magic) != DRBD_MD_MAGIC_84_UNCLEAN)
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return -1;
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/*
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* DRBD does not have "real" uuids; the following resembles DRBD's
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* notion of uuids (64 bit, see struct above)
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*/
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blkid_probe_sprintf_uuid(pr,
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(unsigned char *) &md->device_uuid, sizeof(md->device_uuid),
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"%" PRIx64, be64_to_cpu(md->device_uuid));
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blkid_probe_set_version(pr, "v08");
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if (blkid_probe_set_magic(pr,
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off + offsetof(struct md_on_disk_08, magic),
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sizeof(md->magic),
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(unsigned char *) &md->magic))
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return -1;
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return 0;
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}
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const struct blkid_idinfo drbd_idinfo =
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{
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.name = "drbd",
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.usage = BLKID_USAGE_RAID,
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.probefunc = probe_drbd,
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.magics = BLKID_NONE_MAGIC
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};
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