diff options
Diffstat (limited to 'util-linux/volume_id/ext.c')
| -rw-r--r-- | util-linux/volume_id/ext.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/util-linux/volume_id/ext.c b/util-linux/volume_id/ext.c new file mode 100644 index 000000000..3c07f5301 --- /dev/null +++ b/util-linux/volume_id/ext.c @@ -0,0 +1,71 @@ +/* + * 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]; +} __attribute__((__packed__)); + +#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x00000004 +#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x00000008 +#define EXT_SUPERBLOCK_OFFSET 0x400 + +int volume_id_probe_ext(struct volume_id *id, uint64_t off) +{ + struct ext2_super_block *es; + + dbg("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) + 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); + + if ((le32_to_cpu(es->feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0) + id->type = "ext3"; + else + id->type = "ext2"; + + return 0; +} |