| 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) 2004 Kay Sievers <kay.sievers@vrfy.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 | struct ext2_super_block {
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| 24 | uint32_t inodes_count;
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| 25 | uint32_t blocks_count;
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| 26 | uint32_t r_blocks_count;
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| 27 | uint32_t free_blocks_count;
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| 28 | uint32_t free_inodes_count;
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| 29 | uint32_t first_data_block;
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| 30 | uint32_t log_block_size;
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| 31 | uint32_t dummy3[7];
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| 32 | uint8_t magic[2];
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| 33 | uint16_t state;
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| 34 | uint32_t dummy5[8];
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| 35 | uint32_t feature_compat;
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| 36 | uint32_t feature_incompat;
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| 37 | uint32_t feature_ro_compat;
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| 38 | uint8_t uuid[16];
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| 39 | uint8_t volume_name[16];
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| 40 | } PACKED;
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| 41 |
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| 42 | #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x00000004
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| 43 | #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x00000008
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| 44 | #define EXT_SUPERBLOCK_OFFSET 0x400
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| 45 |
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| 46 | int FAST_FUNC volume_id_probe_ext(struct volume_id *id /*,uint64_t off*/)
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| 47 | {
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| 48 | #define off ((uint64_t)0)
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| 49 | struct ext2_super_block *es;
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| 50 |
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| 51 | dbg("ext: probing at offset 0x%llx", (unsigned long long) off);
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| 52 |
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| 53 | es = volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200);
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| 54 | if (es == NULL)
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| 55 | return -1;
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| 56 |
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| 57 | if (es->magic[0] != 0123 || es->magic[1] != 0357) {
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| 58 | dbg("ext: no magic found");
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| 59 | return -1;
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| 60 | }
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| 61 |
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| 62 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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| 63 | // volume_id_set_label_raw(id, es->volume_name, 16);
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| 64 | volume_id_set_label_string(id, es->volume_name, 16);
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| 65 | volume_id_set_uuid(id, es->uuid, UUID_DCE);
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| 66 | dbg("ext: label '%s' uuid '%s'", id->label, id->uuid);
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| 67 |
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| 68 | // if ((le32_to_cpu(es->feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0)
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| 69 | // id->type = "ext3";
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| 70 | // else
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| 71 | // id->type = "ext2";
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| 72 |
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| 73 | return 0;
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| 74 | }
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