From 0834e00a603b42d9f40b1bbe8b3d4158b918eb35 Mon Sep 17 00:00:00 2001 From: Bastian Friedrich Date: Mon, 4 Jan 2010 14:13:13 +0100 Subject: [PATCH] libblkid: DRBD support for blkid DRBD is the Distributed Replicated Block Device, a replication service for low level block devices. The attached patch provides libblkid detection for v08 type drbd devices (v08 is the current one). [kzak@redhat.com: - port to libblkid 2.17 - use BLKID_USAGE_RAID flag - remove BLKID_IDINFO_TOLERANT flag - note that DRBD is supported since kernel v2.6.33-rc1] Signed-off-by: Bastian Friedrich Signed-off-by: Karel Zak --- shlibs/blkid/src/superblocks/Makefile.am | 1 + shlibs/blkid/src/superblocks/drbd.c | 106 +++++++++++++++++++++ shlibs/blkid/src/superblocks/superblocks.c | 1 + shlibs/blkid/src/superblocks/superblocks.h | 1 + 4 files changed, 109 insertions(+) create mode 100644 shlibs/blkid/src/superblocks/drbd.c diff --git a/shlibs/blkid/src/superblocks/Makefile.am b/shlibs/blkid/src/superblocks/Makefile.am index 8cf3009b..33e5d0c3 100644 --- a/shlibs/blkid/src/superblocks/Makefile.am +++ b/shlibs/blkid/src/superblocks/Makefile.am @@ -44,4 +44,5 @@ libblkid_superblocks_la_SOURCES = \ zfs.c \ ubifs.c \ bfs.c \ + drbd.c \ vmfs.c diff --git a/shlibs/blkid/src/superblocks/drbd.c b/shlibs/blkid/src/superblocks/drbd.c new file mode 100644 index 00000000..e0bbb4d6 --- /dev/null +++ b/shlibs/blkid/src/superblocks/drbd.c @@ -0,0 +1,106 @@ +/* + * Copyright (C) 2009 by Bastian Friedrich + * + * This file may be redistributed under the terms of the + * GNU Lesser General Public License. + * + * defines, structs taken from drbd source; file names represent drbd source + * files. + */ +#include +#include +#include +#include +#include +#include +#include + +#include "superblocks.h" + +/* + * drbd/linux/drbd.h + */ +#define DRBD_MAGIC 0x83740267 + +/* + * user/drbdmeta.c + * We only support v08 for now + */ +#define DRBD_MD_MAGIC_08 (DRBD_MAGIC+4) + +/* + * drbd/linux/drbd.h + */ +enum drbd_uuid_index { + UI_CURRENT, + UI_BITMAP, + UI_HISTORY_START, + UI_HISTORY_END, + UI_SIZE, /* nl-packet: number of dirty bits */ + UI_FLAGS, /* nl-packet: flags */ + UI_EXTENDED_SIZE /* Everything. */ +}; + +/* + * user/drbdmeta.c + * Minor modifications wrt. types + */ +struct md_on_disk_08 { + uint64_t la_sect; /* last agreed size. */ + uint64_t uuid[UI_SIZE]; /* UUIDs */ + uint64_t device_uuid; + uint64_t reserved_u64_1; + uint32_t flags; + uint32_t magic; + uint32_t md_size_sect; + int32_t al_offset; /* signed sector offset to this block */ + uint32_t al_nr_extents; /* important for restoring the AL */ + int32_t bm_offset; /* signed sector offset to the bitmap, from here */ + uint32_t bm_bytes_per_bit; + uint32_t reserved_u32[4]; + + char reserved[8 * 512 - (8*(UI_SIZE+3)+4*11)]; +}; + + +static int probe_drbd(blkid_probe pr, const struct blkid_idmag *mag) +{ + struct md_on_disk_08 *md; + off_t off; + + off = pr->size - sizeof(*md); + + /* Small devices cannot be drbd (?) */ + if (pr->size < 0x10000) + return -1; + + md = (struct md_on_disk_08 *) + blkid_probe_get_buffer(pr, + off, + sizeof(struct md_on_disk_08)); + + + if (be32_to_cpu(md->magic) != DRBD_MD_MAGIC_08) + return -1; + + /* + * DRBD does not have "real" uuids; the following resembles DRBD's + * notion of uuids (64 bit, see struct above) + */ + blkid_probe_sprintf_uuid(pr, + (unsigned char *) &md->device_uuid, sizeof(md->device_uuid), + "0x%" PRIx64, be64_to_cpu(md->device_uuid)); + + blkid_probe_set_version(pr, "v08"); + + return 0; +} + +const struct blkid_idinfo drbd_idinfo = +{ + .name = "drbd", + .usage = BLKID_USAGE_RAID, + .probefunc = probe_drbd, + .magics = BLKID_NONE_MAGIC +}; + diff --git a/shlibs/blkid/src/superblocks/superblocks.c b/shlibs/blkid/src/superblocks/superblocks.c index f625f271..e77c511d 100644 --- a/shlibs/blkid/src/superblocks/superblocks.c +++ b/shlibs/blkid/src/superblocks/superblocks.c @@ -94,6 +94,7 @@ static const struct blkid_idinfo *idinfos[] = &adraid_idinfo, &jmraid_idinfo, + &drbd_idinfo, &lvm2_idinfo, &lvm1_idinfo, &snapcow_idinfo, diff --git a/shlibs/blkid/src/superblocks/superblocks.h b/shlibs/blkid/src/superblocks/superblocks.h index d1f55595..893ae72a 100644 --- a/shlibs/blkid/src/superblocks/superblocks.h +++ b/shlibs/blkid/src/superblocks/superblocks.h @@ -63,6 +63,7 @@ extern const struct blkid_idinfo zfs_idinfo; extern const struct blkid_idinfo bfs_idinfo; extern const struct blkid_idinfo vmfs_volume_idinfo; extern const struct blkid_idinfo vmfs_fs_idinfo; +extern const struct blkid_idinfo drbd_idinfo; /* * superblock functions -- 2.39.5