| 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 | //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_EXT) += ext.o
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| 22 |
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| 23 | //config:
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| 24 | //config:config FEATURE_VOLUMEID_EXT
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| 25 | //config: bool "Ext filesystem"
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| 26 | //config: default y
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| 27 | //config: depends on VOLUMEID
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| 28 | //config: help
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| 29 | //config: TODO
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| 30 | //config:
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| 31 |
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| 32 | #include "volume_id_internal.h"
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| 33 | #include "bb_e2fs_defs.h"
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| 34 |
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| 35 | #define EXT_SUPERBLOCK_OFFSET 0x400
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| 36 |
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| 37 | int FAST_FUNC volume_id_probe_ext(struct volume_id *id /*,uint64_t off*/)
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| 38 | {
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| 39 | #define off ((uint64_t)0)
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| 40 | struct ext2_super_block *es;
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| 41 |
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| 42 | dbg("ext: probing at offset 0x%llx", (unsigned long long) off);
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| 43 |
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| 44 | es = volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200);
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| 45 | if (es == NULL)
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| 46 | return -1;
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| 47 |
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| 48 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
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| 49 | dbg("ext: no magic found");
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| 50 | return -1;
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| 51 | }
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| 52 |
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| 53 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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| 54 | // volume_id_set_label_raw(id, es->volume_name, 16);
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| 55 | volume_id_set_label_string(id, (void*)es->s_volume_name, 16);
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| 56 | volume_id_set_uuid(id, es->s_uuid, UUID_DCE);
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| 57 | dbg("ext: label '%s' uuid '%s'", id->label, id->uuid);
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| 58 |
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| 59 | #if ENABLE_FEATURE_BLKID_TYPE
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| 60 | if ((es->s_feature_ro_compat & cpu_to_le32(EXT4_FEATURE_RO_COMPAT_HUGE_FILE | EXT4_FEATURE_RO_COMPAT_DIR_NLINK))
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| 61 | || (es->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_EXTENTS | EXT4_FEATURE_INCOMPAT_64BIT))
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| 62 | ) {
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| 63 | id->type = "ext4";
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| 64 | }
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| 65 | else if (es->s_feature_compat & cpu_to_le32(EXT3_FEATURE_COMPAT_HAS_JOURNAL))
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| 66 | id->type = "ext3";
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| 67 | else
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| 68 | id->type = "ext2";
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| 69 | #endif
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| 70 | return 0;
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| 71 | }
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