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>
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@ -25,10 +25,12 @@
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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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* We support v08 and v09
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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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#define DRBD_MD_MAGIC_09 (DRBD_MAGIC+6)
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/* there is no DRBD_MD_MAGIC_09_UNCLEAN */
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/*
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* drbd/linux/drbd.h
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@ -44,7 +46,7 @@ enum drbd_uuid_index {
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};
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/*
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* user/drbdmeta.c
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* user/shared/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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@ -64,9 +66,54 @@ struct md_on_disk_08 {
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char reserved[8 * 512 - (8*(UI_SIZE+3)+4*11)];
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};
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/*
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* linux/drbd.h, v9 only
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*/
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#define DRBD_PEERS_MAX 32
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#define HISTORY_UUIDS DRBD_PEERS_MAX
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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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* drbd-headers/drbd_meta_data.h
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* Minor modifications wrt. types
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*/
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struct peer_dev_md_on_disk_9 {
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uint64_t bitmap_uuid;
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uint64_t bitmap_dagtag;
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uint32_t flags;
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int32_t bitmap_index;
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uint32_t reserved_u32[2];
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} __attribute__((packed));
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struct meta_data_on_disk_9 {
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uint64_t effective_size; /* last agreed size */
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uint64_t current_uuid;
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uint64_t reserved_u64[4]; /* to have the magic at the same position as in v07, and v08 */
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uint64_t device_uuid;
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uint32_t flags; /* MDF */
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uint32_t magic;
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uint32_t md_size_sect;
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uint32_t al_offset; /* offset to this block */
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uint32_t al_nr_extents; /* important for restoring the AL */
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uint32_t bm_offset; /* offset to the bitmap, from here */
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uint32_t bm_bytes_per_bit; /* BM_BLOCK_SIZE */
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uint32_t la_peer_max_bio_size; /* last peer max_bio_size */
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uint32_t bm_max_peers;
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int32_t node_id;
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/* see al_tr_number_to_on_disk_sector() */
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uint32_t al_stripes;
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uint32_t al_stripe_size_4k;
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uint32_t reserved_u32[2];
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struct peer_dev_md_on_disk_9 peers[DRBD_PEERS_MAX];
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uint64_t history_uuids[HISTORY_UUIDS];
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char padding[0] __attribute__((aligned(4096)));
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} __attribute__((packed));
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static int probe_drbd_84(blkid_probe pr)
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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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@ -107,6 +154,62 @@ static int probe_drbd(blkid_probe pr,
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return 0;
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}
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static int probe_drbd_90(blkid_probe pr)
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{
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struct meta_data_on_disk_9 *md;
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off_t off;
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off = pr->size - sizeof(*md);
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/*
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* Smaller ones are certainly not DRBD9 devices.
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* Recent utils even refuse to generate larger ones,
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* keep this as a sufficient lower bound.
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*/
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if (pr->size < 0x10000)
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return 1;
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md = (struct meta_data_on_disk_9 *)
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blkid_probe_get_buffer(pr,
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off,
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sizeof(struct meta_data_on_disk_9));
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if (!md)
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return errno ? -errno : 1;
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if (be32_to_cpu(md->magic) != DRBD_MD_MAGIC_09)
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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, "v09");
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if (blkid_probe_set_magic(pr,
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off + offsetof(struct meta_data_on_disk_9, 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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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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int ret;
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ret = probe_drbd_84(pr);
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if (ret <= 0) /* success or fatal (-errno) */
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return ret;
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return probe_drbd_90(pr);
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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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