1 | /*
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2 | * volume_id - reads filesystem label and uuid
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3 | *
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4 | * Copyright (C) Andre Masella <andre@masella.no-ip.org>
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5 | *
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6 | * This library is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU Lesser General Public
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8 | * License as published by the Free Software Foundation; either
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9 | * version 2.1 of the License, or (at your option) any later version.
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10 | *
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11 | * This library is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | * Lesser General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU Lesser General Public
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17 | * License along with this library; if not, write to the Free Software
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18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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19 | */
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20 |
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21 | #include "volume_id_internal.h"
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22 |
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23 | /* All these values are taken from ocfs2-tools's ocfs2_fs.h */
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24 | #define OCFS2_VOL_UUID_LEN 16
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25 | #define OCFS2_MAX_VOL_LABEL_LEN 64
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26 | #define OCFS2_SUPERBLOCK_OFFSET 0x2000
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27 |
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28 |
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29 | /* This is the superblock. The OCFS2 header files have structs in structs.
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30 | This is one has been simplified since we only care about the superblock.
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31 | */
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32 |
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33 | struct ocfs2_super_block {
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34 | uint8_t i_signature[8]; /* Signature for validation */
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35 | uint32_t i_generation; /* Generation number */
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36 | int16_t i_suballoc_slot; /* Slot suballocator this inode belongs to */
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37 | uint16_t i_suballoc_bit; /* Bit offset in suballocator block group */
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38 | uint32_t i_reserved0;
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39 | uint32_t i_clusters; /* Cluster count */
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40 | uint32_t i_uid; /* Owner UID */
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41 | uint32_t i_gid; /* Owning GID */
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42 | uint64_t i_size; /* Size in bytes */
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43 | uint16_t i_mode; /* File mode */
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44 | uint16_t i_links_count; /* Links count */
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45 | uint32_t i_flags; /* File flags */
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46 | uint64_t i_atime; /* Access time */
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47 | uint64_t i_ctime; /* Creation time */
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48 | uint64_t i_mtime; /* Modification time */
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49 | uint64_t i_dtime; /* Deletion time */
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50 | uint64_t i_blkno; /* Offset on disk, in blocks */
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51 | uint64_t i_last_eb_blk; /* Pointer to last extent block */
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52 | uint32_t i_fs_generation; /* Generation per fs-instance */
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53 | uint32_t i_atime_nsec;
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54 | uint32_t i_ctime_nsec;
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55 | uint32_t i_mtime_nsec;
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56 | uint64_t i_reserved1[9];
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57 | uint64_t i_pad1; /* Generic way to refer to this 64bit union */
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58 | /* Normally there is a union of the different block types, but we only care about the superblock. */
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59 | uint16_t s_major_rev_level;
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60 | uint16_t s_minor_rev_level;
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61 | uint16_t s_mnt_count;
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62 | int16_t s_max_mnt_count;
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63 | uint16_t s_state; /* File system state */
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64 | uint16_t s_errors; /* Behaviour when detecting errors */
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65 | uint32_t s_checkinterval; /* Max time between checks */
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66 | uint64_t s_lastcheck; /* Time of last check */
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67 | uint32_t s_creator_os; /* OS */
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68 | uint32_t s_feature_compat; /* Compatible feature set */
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69 | uint32_t s_feature_incompat; /* Incompatible feature set */
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70 | uint32_t s_feature_ro_compat; /* Readonly-compatible feature set */
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71 | uint64_t s_root_blkno; /* Offset, in blocks, of root directory dinode */
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72 | uint64_t s_system_dir_blkno; /* Offset, in blocks, of system directory dinode */
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73 | uint32_t s_blocksize_bits; /* Blocksize for this fs */
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74 | uint32_t s_clustersize_bits; /* Clustersize for this fs */
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75 | uint16_t s_max_slots; /* Max number of simultaneous mounts before tunefs required */
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76 | uint16_t s_reserved1;
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77 | uint32_t s_reserved2;
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78 | uint64_t s_first_cluster_group; /* Block offset of 1st cluster group header */
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79 | uint8_t s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
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80 | uint8_t s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */
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81 | } PACKED;
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82 |
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83 | int FAST_FUNC volume_id_probe_ocfs2(struct volume_id *id /*,uint64_t off*/)
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84 | {
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85 | #define off ((uint64_t)0)
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86 | struct ocfs2_super_block *os;
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87 |
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88 | dbg("probing at offset 0x%llx", (unsigned long long) off);
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89 |
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90 | os = volume_id_get_buffer(id, off + OCFS2_SUPERBLOCK_OFFSET, 0x200);
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91 | if (os == NULL)
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92 | return -1;
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93 |
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94 | if (memcmp(os->i_signature, "OCFSV2", 6) != 0) {
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95 | return -1;
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96 | }
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97 |
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98 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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99 | // volume_id_set_label_raw(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ?
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100 | // OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE);
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101 | volume_id_set_label_string(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ?
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102 | OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE);
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103 | volume_id_set_uuid(id, os->s_uuid, UUID_DCE);
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104 | // id->type = "ocfs2";
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105 | return 0;
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106 | }
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