| bigbiff bigbiff | e60683a | 2013-02-22 20:55:50 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 Karel Zak <kzak@redhat.com> |
| 3 | * |
| 4 | * This file may be redistributed under the terms of the |
| 5 | * GNU Lesser General Public License. |
| 6 | */ |
| 7 | #include <stdio.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <unistd.h> |
| 10 | #include <string.h> |
| 11 | #include <stdint.h> |
| 12 | |
| 13 | #include "superblocks.h" |
| 14 | |
| 15 | /* Common gfs/gfs2 constants: */ |
| 16 | #define GFS_LOCKNAME_LEN 64 |
| 17 | |
| 18 | /* gfs1 constants: */ |
| 19 | #define GFS_FORMAT_FS 1309 |
| 20 | #define GFS_FORMAT_MULTI 1401 |
| 21 | /* gfs2 constants: */ |
| 22 | #define GFS2_FORMAT_FS 1801 |
| 23 | #define GFS2_FORMAT_MULTI 1900 |
| 24 | |
| 25 | struct gfs2_meta_header { |
| 26 | uint32_t mh_magic; |
| 27 | uint32_t mh_type; |
| 28 | uint64_t __pad0; /* Was generation number in gfs1 */ |
| 29 | uint32_t mh_format; |
| 30 | uint32_t __pad1; /* Was incarnation number in gfs1 */ |
| 31 | }; |
| 32 | |
| 33 | struct gfs2_inum { |
| 34 | uint64_t no_formal_ino; |
| 35 | uint64_t no_addr; |
| 36 | }; |
| 37 | |
| 38 | struct gfs2_sb { |
| 39 | struct gfs2_meta_header sb_header; |
| 40 | |
| 41 | uint32_t sb_fs_format; |
| 42 | uint32_t sb_multihost_format; |
| 43 | uint32_t __pad0; /* Was superblock flags in gfs1 */ |
| 44 | |
| 45 | uint32_t sb_bsize; |
| 46 | uint32_t sb_bsize_shift; |
| 47 | uint32_t __pad1; /* Was journal segment size in gfs1 */ |
| 48 | |
| 49 | struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */ |
| 50 | struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */ |
| 51 | struct gfs2_inum sb_root_dir; |
| 52 | |
| 53 | char sb_lockproto[GFS_LOCKNAME_LEN]; |
| 54 | char sb_locktable[GFS_LOCKNAME_LEN]; |
| 55 | |
| 56 | struct gfs2_inum __pad3; /* Was quota inode in gfs1 */ |
| 57 | struct gfs2_inum __pad4; /* Was licence inode in gfs1 */ |
| 58 | uint8_t sb_uuid[16]; /* The UUID maybe 0 for backwards compat */ |
| 59 | } __attribute__((packed)); |
| 60 | |
| 61 | static int probe_gfs(blkid_probe pr, const struct blkid_idmag *mag) |
| 62 | { |
| 63 | struct gfs2_sb *sbd; |
| 64 | |
| 65 | sbd = blkid_probe_get_sb(pr, mag, struct gfs2_sb); |
| 66 | if (!sbd) |
| 67 | return -1; |
| 68 | |
| 69 | if (be32_to_cpu(sbd->sb_fs_format) == GFS_FORMAT_FS && |
| 70 | be32_to_cpu(sbd->sb_multihost_format) == GFS_FORMAT_MULTI) |
| 71 | { |
| 72 | if (*sbd->sb_locktable) |
| 73 | blkid_probe_set_label(pr, |
| 74 | (unsigned char *) sbd->sb_locktable, |
| 75 | sizeof(sbd->sb_locktable)); |
| 76 | |
| 77 | blkid_probe_set_uuid(pr, sbd->sb_uuid); |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | return -1; |
| 82 | } |
| 83 | |
| 84 | static int probe_gfs2(blkid_probe pr, const struct blkid_idmag *mag) |
| 85 | { |
| 86 | struct gfs2_sb *sbd; |
| 87 | |
| 88 | sbd = blkid_probe_get_sb(pr, mag, struct gfs2_sb); |
| 89 | if (!sbd) |
| 90 | return -1; |
| 91 | |
| 92 | if (be32_to_cpu(sbd->sb_fs_format) == GFS2_FORMAT_FS && |
| 93 | be32_to_cpu(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI) |
| 94 | { |
| 95 | if (*sbd->sb_locktable) |
| 96 | blkid_probe_set_label(pr, |
| 97 | (unsigned char *) sbd->sb_locktable, |
| 98 | sizeof(sbd->sb_locktable)); |
| 99 | blkid_probe_set_uuid(pr, sbd->sb_uuid); |
| 100 | blkid_probe_set_version(pr, "1"); |
| 101 | return 0; |
| 102 | } |
| 103 | return -1; |
| 104 | } |
| 105 | |
| 106 | const struct blkid_idinfo gfs_idinfo = |
| 107 | { |
| 108 | .name = "gfs", |
| 109 | .usage = BLKID_USAGE_FILESYSTEM, |
| 110 | .probefunc = probe_gfs, |
| 111 | .minsz = 32 * 1024 * 1024, /* minimal size of GFS journal */ |
| 112 | .magics = |
| 113 | { |
| 114 | { .magic = "\x01\x16\x19\x70", .len = 4, .kboff = 64 }, |
| 115 | { NULL } |
| 116 | } |
| 117 | }; |
| 118 | |
| 119 | const struct blkid_idinfo gfs2_idinfo = |
| 120 | { |
| 121 | .name = "gfs2", |
| 122 | .usage = BLKID_USAGE_FILESYSTEM, |
| 123 | .probefunc = probe_gfs2, |
| 124 | .minsz = 32 * 1024 * 1024, /* minimal size of GFS journal */ |
| 125 | .magics = |
| 126 | { |
| 127 | { .magic = "\x01\x16\x19\x70", .len = 4, .kboff = 64 }, |
| 128 | { NULL } |
| 129 | } |
| 130 | }; |
| 131 | |