| 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 | IF_FEATURE_BLKID_TYPE(id->type = "ocfs2";)
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| 105 | return 0;
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| 106 | }
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