| bigbiff bigbiff | e60683a | 2013-02-22 20:55:50 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2009 by Bastian Friedrich <bastian.friedrich@collax.com> |
| 3 | * |
| 4 | * This file may be redistributed under the terms of the |
| 5 | * GNU Lesser General Public License. |
| 6 | * |
| 7 | * defines, structs taken from drbd source; file names represent drbd source |
| 8 | * files. |
| 9 | */ |
| 10 | #include <stdio.h> |
| 11 | #include <stdlib.h> |
| 12 | #include <unistd.h> |
| 13 | #include <string.h> |
| 14 | #include <errno.h> |
| 15 | #include <ctype.h> |
| 16 | #include <inttypes.h> |
| 17 | #include <stddef.h> |
| 18 | |
| 19 | #include "superblocks.h" |
| 20 | |
| 21 | /* |
| 22 | * drbd/linux/drbd.h |
| 23 | */ |
| 24 | #define DRBD_MAGIC 0x83740267 |
| 25 | |
| 26 | /* |
| 27 | * user/drbdmeta.c |
| 28 | * We only support v08 for now |
| 29 | */ |
| 30 | #define DRBD_MD_MAGIC_08 (DRBD_MAGIC+4) |
| 31 | #define DRBD_MD_MAGIC_84_UNCLEAN (DRBD_MAGIC+5) |
| 32 | |
| 33 | /* |
| 34 | * drbd/linux/drbd.h |
| 35 | */ |
| 36 | enum drbd_uuid_index { |
| 37 | UI_CURRENT, |
| 38 | UI_BITMAP, |
| 39 | UI_HISTORY_START, |
| 40 | UI_HISTORY_END, |
| 41 | UI_SIZE, /* nl-packet: number of dirty bits */ |
| 42 | UI_FLAGS, /* nl-packet: flags */ |
| 43 | UI_EXTENDED_SIZE /* Everything. */ |
| 44 | }; |
| 45 | |
| 46 | /* |
| 47 | * user/drbdmeta.c |
| 48 | * Minor modifications wrt. types |
| 49 | */ |
| 50 | struct md_on_disk_08 { |
| 51 | uint64_t la_sect; /* last agreed size. */ |
| 52 | uint64_t uuid[UI_SIZE]; /* UUIDs */ |
| 53 | uint64_t device_uuid; |
| 54 | uint64_t reserved_u64_1; |
| 55 | uint32_t flags; |
| 56 | uint32_t magic; |
| 57 | uint32_t md_size_sect; |
| 58 | int32_t al_offset; /* signed sector offset to this block */ |
| 59 | uint32_t al_nr_extents; /* important for restoring the AL */ |
| 60 | int32_t bm_offset; /* signed sector offset to the bitmap, from here */ |
| 61 | uint32_t bm_bytes_per_bit; |
| 62 | uint32_t reserved_u32[4]; |
| 63 | |
| 64 | char reserved[8 * 512 - (8*(UI_SIZE+3)+4*11)]; |
| 65 | }; |
| 66 | |
| 67 | |
| 68 | static int probe_drbd(blkid_probe pr, |
| 69 | const struct blkid_idmag *mag __attribute__((__unused__))) |
| 70 | { |
| 71 | struct md_on_disk_08 *md; |
| 72 | off_t off; |
| 73 | |
| 74 | off = pr->size - sizeof(*md); |
| 75 | |
| 76 | /* Small devices cannot be drbd (?) */ |
| 77 | if (pr->size < 0x10000) |
| 78 | return -1; |
| 79 | |
| 80 | md = (struct md_on_disk_08 *) |
| 81 | blkid_probe_get_buffer(pr, |
| 82 | off, |
| 83 | sizeof(struct md_on_disk_08)); |
| 84 | if (!md) |
| 85 | return -1; |
| 86 | |
| 87 | if (be32_to_cpu(md->magic) != DRBD_MD_MAGIC_08 && |
| 88 | be32_to_cpu(md->magic) != DRBD_MD_MAGIC_84_UNCLEAN) |
| 89 | return -1; |
| 90 | |
| 91 | /* |
| 92 | * DRBD does not have "real" uuids; the following resembles DRBD's |
| 93 | * notion of uuids (64 bit, see struct above) |
| 94 | */ |
| 95 | blkid_probe_sprintf_uuid(pr, |
| 96 | (unsigned char *) &md->device_uuid, sizeof(md->device_uuid), |
| 97 | "%" PRIx64, be64_to_cpu(md->device_uuid)); |
| 98 | |
| 99 | blkid_probe_set_version(pr, "v08"); |
| 100 | |
| 101 | if (blkid_probe_set_magic(pr, |
| 102 | off + offsetof(struct md_on_disk_08, magic), |
| 103 | sizeof(md->magic), |
| 104 | (unsigned char *) &md->magic)) |
| 105 | return -1; |
| 106 | |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | const struct blkid_idinfo drbd_idinfo = |
| 111 | { |
| 112 | .name = "drbd", |
| 113 | .usage = BLKID_USAGE_RAID, |
| 114 | .probefunc = probe_drbd, |
| 115 | .magics = BLKID_NONE_MAGIC |
| 116 | }; |
| 117 | |