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106 lines
4.3 KiB
C
106 lines
4.3 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) Andre Masella <andre@masella.no-ip.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "volume_id_internal.h"
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/* All these values are taken from ocfs2-tools's ocfs2_fs.h */
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#define OCFS2_VOL_UUID_LEN 16
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#define OCFS2_MAX_VOL_LABEL_LEN 64
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#define OCFS2_SUPERBLOCK_OFFSET 0x2000
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/* This is the superblock. The OCFS2 header files have structs in structs.
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This is one has been simplified since we only care about the superblock.
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*/
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struct ocfs2_super_block {
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uint8_t i_signature[8]; /* Signature for validation */
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uint32_t i_generation; /* Generation number */
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int16_t i_suballoc_slot; /* Slot suballocator this inode belongs to */
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uint16_t i_suballoc_bit; /* Bit offset in suballocator block group */
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uint32_t i_reserved0;
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uint32_t i_clusters; /* Cluster count */
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uint32_t i_uid; /* Owner UID */
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uint32_t i_gid; /* Owning GID */
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uint64_t i_size; /* Size in bytes */
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uint16_t i_mode; /* File mode */
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uint16_t i_links_count; /* Links count */
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uint32_t i_flags; /* File flags */
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uint64_t i_atime; /* Access time */
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uint64_t i_ctime; /* Creation time */
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uint64_t i_mtime; /* Modification time */
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uint64_t i_dtime; /* Deletion time */
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uint64_t i_blkno; /* Offset on disk, in blocks */
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uint64_t i_last_eb_blk; /* Pointer to last extent block */
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uint32_t i_fs_generation; /* Generation per fs-instance */
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uint32_t i_atime_nsec;
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uint32_t i_ctime_nsec;
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uint32_t i_mtime_nsec;
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uint64_t i_reserved1[9];
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uint64_t i_pad1; /* Generic way to refer to this 64bit union */
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/* Normally there is a union of the different block types, but we only care about the superblock. */
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uint16_t s_major_rev_level;
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uint16_t s_minor_rev_level;
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uint16_t s_mnt_count;
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int16_t s_max_mnt_count;
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uint16_t s_state; /* File system state */
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uint16_t s_errors; /* Behaviour when detecting errors */
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uint32_t s_checkinterval; /* Max time between checks */
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uint64_t s_lastcheck; /* Time of last check */
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uint32_t s_creator_os; /* OS */
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uint32_t s_feature_compat; /* Compatible feature set */
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uint32_t s_feature_incompat; /* Incompatible feature set */
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uint32_t s_feature_ro_compat; /* Readonly-compatible feature set */
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uint64_t s_root_blkno; /* Offset, in blocks, of root directory dinode */
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uint64_t s_system_dir_blkno; /* Offset, in blocks, of system directory dinode */
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uint32_t s_blocksize_bits; /* Blocksize for this fs */
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uint32_t s_clustersize_bits; /* Clustersize for this fs */
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uint16_t s_max_slots; /* Max number of simultaneous mounts before tunefs required */
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uint16_t s_reserved1;
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uint32_t s_reserved2;
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uint64_t s_first_cluster_group; /* Block offset of 1st cluster group header */
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uint8_t s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
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uint8_t s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */
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} __attribute__((__packed__));
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int volume_id_probe_ocfs2(struct volume_id *id, uint64_t off)
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{
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struct ocfs2_super_block *os;
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dbg("probing at offset 0x%llx", (unsigned long long) off);
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os = volume_id_get_buffer(id, off + OCFS2_SUPERBLOCK_OFFSET, 0x200);
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if (os == NULL)
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return -1;
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if (memcmp(os->i_signature, "OCFSV2", 6) != 0) {
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return -1;
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}
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volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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volume_id_set_label_raw(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ?
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OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE);
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volume_id_set_label_string(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ?
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OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE);
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volume_id_set_uuid(id, os->s_uuid, UUID_DCE);
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id->type = "ocfs2";
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return 0;
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}
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