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135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE 1
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#endif
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include "libvolume_id.h"
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#include "util.h"
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struct ext2_super_block {
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uint32_t s_inodes_count;
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uint32_t s_blocks_count;
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uint32_t s_r_blocks_count;
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uint32_t s_free_blocks_count;
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uint32_t s_free_inodes_count;
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uint32_t s_first_data_block;
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uint32_t s_log_block_size;
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uint32_t s_log_frag_size;
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uint32_t s_blocks_per_group;
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uint32_t s_frags_per_group;
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uint32_t s_inodes_per_group;
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uint32_t s_mtime;
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uint32_t s_wtime;
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uint16_t s_mnt_count;
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uint16_t s_max_mnt_count;
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uint16_t s_magic;
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uint16_t s_state;
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uint16_t s_errors;
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uint16_t s_minor_rev_level;
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uint32_t s_lastcheck;
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uint32_t s_checkinterval;
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uint32_t s_creator_os;
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uint32_t s_rev_level;
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uint16_t s_def_resuid;
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uint16_t s_def_resgid;
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uint32_t s_first_ino;
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uint16_t s_inode_size;
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uint16_t s_block_group_nr;
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uint32_t s_feature_compat;
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uint32_t s_feature_incompat;
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uint32_t s_feature_ro_compat;
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uint8_t s_uuid[16];
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uint8_t s_volume_name[16];
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} PACKED;
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#define EXT_SUPER_MAGIC 0xEF53
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#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
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#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
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#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040
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#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
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#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
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#define EXT_SUPERBLOCK_OFFSET 0x400
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#define EXT3_MIN_BLOCK_SIZE 0x400
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#define EXT3_MAX_BLOCK_SIZE 0x1000
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int volume_id_probe_ext(struct volume_id *id, uint64_t off, uint64_t size)
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{
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struct ext2_super_block *es;
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size_t bsize;
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uint32_t feature_compat;
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uint32_t feature_incompat;
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info("probing at offset 0x%llx", (unsigned long long) off);
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es = (struct ext2_super_block *) volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200);
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if (es == NULL)
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return -1;
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if (es->s_magic != cpu_to_le16(EXT_SUPER_MAGIC))
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return -1;
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bsize = 0x400 << le32_to_cpu(es->s_log_block_size);
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dbg("ext blocksize 0x%zx", bsize);
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if (bsize < EXT3_MIN_BLOCK_SIZE || bsize > EXT3_MAX_BLOCK_SIZE) {
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dbg("invalid ext blocksize");
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return -1;
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}
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volume_id_set_label_raw(id, es->s_volume_name, 16);
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volume_id_set_label_string(id, es->s_volume_name, 16);
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volume_id_set_uuid(id, es->s_uuid, 0, UUID_DCE);
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snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u",
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le32_to_cpu(es->s_rev_level), le16_to_cpu(es->s_minor_rev_level));
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feature_compat = le32_to_cpu(es->s_feature_compat);
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feature_incompat = le32_to_cpu(es->s_feature_incompat);
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/* check for external journal device */
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if ((feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) != 0) {
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volume_id_set_usage(id, VOLUME_ID_OTHER);
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id->type = "jbd";
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goto out;
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}
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volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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if ((feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) != 0 ||
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(feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) != 0 ||
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(feature_incompat & EXT4_FEATURE_INCOMPAT_MMP) != 0) {
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id->type = "ext4";
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goto out;
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}
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if ((feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0) {
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id->type = "ext3";
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goto out;
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}
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id->type = "ext2";
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out:
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return 0;
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}
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