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libblkid: add check for DRBD9 

This adds the according meta-data structs + defines and an additional
function to detect DRBD9 magics.

Signed-off-by: Roland Kammerer <roland.kammerer@linbit.com>
This commit is contained in:
Roland Kammerer 2018-11-20 17:10:49 +01:00 committed by Karel Zak
parent d16afd8d15
commit ca2071c6ea
1 changed files with 107 additions and 4 deletions
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111
libblkid/src/superblocks/drbd.c
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@ -25,10 +25,12 @@
/*
* user/drbdmeta.c
* We only support v08 for now
* We support v08 and v09
*/
#define DRBD_MD_MAGIC_08 (DRBD_MAGIC+4)
#define DRBD_MD_MAGIC_84_UNCLEAN (DRBD_MAGIC+5)
#define DRBD_MD_MAGIC_09 (DRBD_MAGIC+6)
/* there is no DRBD_MD_MAGIC_09_UNCLEAN */
/*
* drbd/linux/drbd.h
@ -44,7 +46,7 @@ enum drbd_uuid_index {
};
/*
* user/drbdmeta.c
* user/shared/drbdmeta.c
* Minor modifications wrt. types
*/
struct md_on_disk_08 {
@ -64,9 +66,54 @@ struct md_on_disk_08 {
char reserved[8 * 512 - (8*(UI_SIZE+3)+4*11)];
};
/*
* linux/drbd.h, v9 only
*/
#define DRBD_PEERS_MAX 32
#define HISTORY_UUIDS DRBD_PEERS_MAX
static int probe_drbd(blkid_probe pr,
const struct blkid_idmag *mag __attribute__((__unused__)))
/*
* drbd-headers/drbd_meta_data.h
* Minor modifications wrt. types
*/
struct peer_dev_md_on_disk_9 {
uint64_t bitmap_uuid;
uint64_t bitmap_dagtag;
uint32_t flags;
int32_t bitmap_index;
uint32_t reserved_u32[2];
} __attribute__((packed));
struct meta_data_on_disk_9 {
uint64_t effective_size; /* last agreed size */
uint64_t current_uuid;
uint64_t reserved_u64[4]; /* to have the magic at the same position as in v07, and v08 */
uint64_t device_uuid;
uint32_t flags; /* MDF */
uint32_t magic;
uint32_t md_size_sect;
uint32_t al_offset; /* offset to this block */
uint32_t al_nr_extents; /* important for restoring the AL */
uint32_t bm_offset; /* offset to the bitmap, from here */
uint32_t bm_bytes_per_bit; /* BM_BLOCK_SIZE */
uint32_t la_peer_max_bio_size; /* last peer max_bio_size */
uint32_t bm_max_peers;
int32_t node_id;
/* see al_tr_number_to_on_disk_sector() */
uint32_t al_stripes;
uint32_t al_stripe_size_4k;
uint32_t reserved_u32[2];
struct peer_dev_md_on_disk_9 peers[DRBD_PEERS_MAX];
uint64_t history_uuids[HISTORY_UUIDS];
char padding[0] __attribute__((aligned(4096)));
} __attribute__((packed));
static int probe_drbd_84(blkid_probe pr)
{
struct md_on_disk_08 *md;
off_t off;
@ -107,6 +154,62 @@ static int probe_drbd(blkid_probe pr,
return 0;
}
static int probe_drbd_90(blkid_probe pr)
{
struct meta_data_on_disk_9 *md;
off_t off;
off = pr->size - sizeof(*md);
/*
* Smaller ones are certainly not DRBD9 devices.
* Recent utils even refuse to generate larger ones,
* keep this as a sufficient lower bound.
*/
if (pr->size < 0x10000)
return 1;
md = (struct meta_data_on_disk_9 *)
blkid_probe_get_buffer(pr,
off,
sizeof(struct meta_data_on_disk_9));
if (!md)
return errno ? -errno : 1;
if (be32_to_cpu(md->magic) != DRBD_MD_MAGIC_09)
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),
"%" PRIx64, be64_to_cpu(md->device_uuid));
blkid_probe_set_version(pr, "v09");
if (blkid_probe_set_magic(pr,
off + offsetof(struct meta_data_on_disk_9, magic),
sizeof(md->magic),
(unsigned char *) &md->magic))
return 1;
return 0;
}
static int probe_drbd(blkid_probe pr,
const struct blkid_idmag *mag __attribute__((__unused__)))
{
int ret;
ret = probe_drbd_84(pr);
if (ret <= 0) /* success or fatal (-errno) */
return ret;
return probe_drbd_90(pr);
}
const struct blkid_idinfo drbd_idinfo =
{
.name = "drbd",