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author | Dees Troy <dees_troy@teamw.in> | 2013-02-27 19:39:14 +0100 |
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committer | Gerrit Code Review <gerrit@5.9.244.119> | 2013-02-27 19:39:14 +0100 |
commit | 2cf31af56114cf997b10218db7c35ee047f5d400 (patch) | |
tree | 85f3b51e45ff8233922f2c0c151299868ca89371 /libblkid/drbd.c | |
parent | libtar - Fix extraction of hardlinks to use the prefix (diff) | |
parent | use libblkid to get filesystem type (diff) | |
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Diffstat (limited to 'libblkid/drbd.c')
-rw-r--r-- | libblkid/drbd.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/libblkid/drbd.c b/libblkid/drbd.c new file mode 100644 index 000000000..43e544e89 --- /dev/null +++ b/libblkid/drbd.c @@ -0,0 +1,117 @@ +/* + * Copyright (C) 2009 by Bastian Friedrich <bastian.friedrich@collax.com> + * + * 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 <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> +#include <ctype.h> +#include <inttypes.h> +#include <stddef.h> + +#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) +#define DRBD_MD_MAGIC_84_UNCLEAN (DRBD_MAGIC+5) + +/* + * 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 __attribute__((__unused__))) +{ + 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 (!md) + return -1; + + if (be32_to_cpu(md->magic) != DRBD_MD_MAGIC_08 && + be32_to_cpu(md->magic) != DRBD_MD_MAGIC_84_UNCLEAN) + 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, "v08"); + + if (blkid_probe_set_magic(pr, + off + offsetof(struct md_on_disk_08, magic), + sizeof(md->magic), + (unsigned char *) &md->magic)) + return -1; + + return 0; +} + +const struct blkid_idinfo drbd_idinfo = +{ + .name = "drbd", + .usage = BLKID_USAGE_RAID, + .probefunc = probe_drbd, + .magics = BLKID_NONE_MAGIC +}; + |