| /* |
| * volume_id - reads filesystem label and uuid |
| * |
| * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include "volume_id_internal.h" |
| |
| struct ext2_super_block { |
| uint32_t inodes_count; |
| uint32_t blocks_count; |
| uint32_t r_blocks_count; |
| uint32_t free_blocks_count; |
| uint32_t free_inodes_count; |
| uint32_t first_data_block; |
| uint32_t log_block_size; |
| uint32_t dummy3[7]; |
| uint8_t magic[2]; |
| uint16_t state; |
| uint32_t dummy5[8]; |
| uint32_t feature_compat; |
| uint32_t feature_incompat; |
| uint32_t feature_ro_compat; |
| uint8_t uuid[16]; |
| uint8_t volume_name[16]; |
| } PACKED; |
| |
| #define EXT_SUPERBLOCK_OFFSET 0x400 |
| |
| /* for s_flags */ |
| #define EXT2_FLAGS_TEST_FILESYS 0x0004 |
| |
| /* for s_feature_compat */ |
| #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 |
| |
| /* for s_feature_ro_compat */ |
| #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 |
| #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 |
| #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 |
| #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 |
| #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 |
| #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 |
| #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 |
| |
| /* for s_feature_incompat */ |
| #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 |
| #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 |
| #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 |
| #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 |
| #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ |
| #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
| #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 |
| #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 |
| |
| #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
| EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ |
| EXT2_FEATURE_RO_COMPAT_BTREE_DIR) |
| #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ |
| EXT2_FEATURE_INCOMPAT_META_BG) |
| #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP |
| #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP |
| |
| #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
| EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ |
| EXT2_FEATURE_RO_COMPAT_BTREE_DIR) |
| #define EXT3_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ |
| EXT3_FEATURE_INCOMPAT_RECOVER| \ |
| EXT2_FEATURE_INCOMPAT_META_BG) |
| #define EXT3_FEATURE_INCOMPAT_UNSUPPORTED ~EXT3_FEATURE_INCOMPAT_SUPP |
| #define EXT3_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT3_FEATURE_RO_COMPAT_SUPP |
| |
| int FAST_FUNC volume_id_probe_ext(struct volume_id *id /*,uint64_t off*/) |
| { |
| #define off ((uint64_t)0) |
| struct ext2_super_block *es; |
| |
| dbg("ext: probing at offset 0x%llx", (unsigned long long) off); |
| |
| es = volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200); |
| if (es == NULL) |
| return -1; |
| |
| if (es->magic[0] != 0123 || es->magic[1] != 0357) { |
| dbg("ext: no magic found"); |
| return -1; |
| } |
| |
| // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); |
| // volume_id_set_label_raw(id, es->volume_name, 16); |
| volume_id_set_label_string(id, es->volume_name, 16); |
| volume_id_set_uuid(id, es->uuid, UUID_DCE); |
| dbg("ext: label '%s' uuid '%s'", id->label, id->uuid); |
| |
| #if ENABLE_FEATURE_BLKID_TYPE |
| if ((es->feature_ro_compat & cpu_to_le32(EXT4_FEATURE_RO_COMPAT_HUGE_FILE | EXT4_FEATURE_RO_COMPAT_DIR_NLINK)) |
| || (es->feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_EXTENTS | EXT4_FEATURE_INCOMPAT_64BIT)) |
| ) { |
| id->type = "ext4"; |
| } |
| else if (es->feature_compat & cpu_to_le32(EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
| id->type = "ext3"; |
| else |
| id->type = "ext2"; |
| #endif |
| return 0; |
| } |