X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=extras%2Fvolume_id%2Flib%2Fext.c;h=56edd2531f01787da0f57c9074e49196a1bad687;hb=726687ad48bdececed1e7e44387c50e009e28208;hp=e5f1e22f6e8d754b1e80c848c77ed6b6e0652532;hpb=444f07fea49bc40207df5e7910907492529b9bce;p=elogind.git diff --git a/extras/volume_id/lib/ext.c b/extras/volume_id/lib/ext.c index e5f1e22f6..56edd2531 100644 --- a/extras/volume_id/lib/ext.c +++ b/extras/volume_id/lib/ext.c @@ -1,7 +1,10 @@ /* * volume_id - reads filesystem label and uuid * - * Copyright (C) 2004 Kay Sievers + * Copyright (C) 2004-2008 Kay Sievers + * Copyright (C) 2008 Theodore Ts'o + * + * The probe logic is based on libblkid from e2fsutils. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the @@ -60,13 +63,63 @@ struct ext2_super_block { uint32_t s_feature_ro_compat; uint8_t s_uuid[16]; uint8_t s_volume_name[16]; + uint8_t s_last_mounted[64]; + uint32_t s_algorithm_usage_bitmap; + uint8_t s_prealloc_blocks; + uint8_t s_prealloc_dir_blocks; + uint16_t s_reserved_gdt_blocks; + uint8_t s_journal_uuid[16]; + uint32_t s_journal_inum; + uint32_t s_journal_dev; + uint32_t s_last_orphan; + uint32_t s_hash_seed[4]; + uint8_t s_def_hash_version; + uint8_t s_jnl_backup_type; + uint16_t s_reserved_word_pad; + uint32_t s_default_mount_opts; + uint32_t s_first_meta_bg; + uint32_t s_mkfs_time; + uint32_t s_jnl_blocks[17]; + uint32_t s_blocks_count_hi; + uint32_t s_r_blocks_count_hi; + uint32_t s_free_blocks_hi; + uint16_t s_min_extra_isize; + uint16_t s_want_extra_isize; + uint32_t s_flags; } PACKED; #define EXT_SUPER_MAGIC 0xEF53 -#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x00000004 -#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x00000008 -#define EXT_SUPERBLOCK_OFFSET 0x400 +#define EXT2_FLAGS_TEST_FILESYS 0x0004 +#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 EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 +#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 +#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 +#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 +#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 + + +#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_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP + +#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ + EXT2_FEATURE_INCOMPAT_META_BG) +#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_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_RO_COMPAT_UNSUPPORTED ~EXT3_FEATURE_RO_COMPAT_SUPP + +#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 EXT_SUPERBLOCK_OFFSET 0x400 #define EXT3_MIN_BLOCK_SIZE 0x400 #define EXT3_MAX_BLOCK_SIZE 0x1000 @@ -74,8 +127,12 @@ int volume_id_probe_ext(struct volume_id *id, uint64_t off, uint64_t size) { struct ext2_super_block *es; size_t bsize; + uint32_t feature_compat; + uint32_t feature_ro_compat; + uint32_t feature_incompat; + uint32_t flags; - info("probing at offset 0x%llx", (unsigned long long) off); + info("probing at offset 0x%llx\n", (unsigned long long) off); es = (struct ext2_super_block *) volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200); if (es == NULL) @@ -85,31 +142,59 @@ int volume_id_probe_ext(struct volume_id *id, uint64_t off, uint64_t size) return -1; bsize = 0x400 << le32_to_cpu(es->s_log_block_size); - dbg("ext blocksize 0x%zx", bsize); + dbg("ext blocksize 0x%zx\n", bsize); if (bsize < EXT3_MIN_BLOCK_SIZE || bsize > EXT3_MAX_BLOCK_SIZE) { - dbg("invalid ext blocksize"); + dbg("invalid ext blocksize\n"); return -1; } - volume_id_set_label_raw(id, es->s_volume_name, 16); - volume_id_set_label_string(id, es->s_volume_name, 16); - volume_id_set_uuid(id, es->s_uuid, 0, UUID_DCE); - snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u", - le32_to_cpu(es->s_rev_level), le16_to_cpu(es->s_minor_rev_level)); + feature_compat = le32_to_cpu(es->s_feature_compat); + feature_ro_compat = le32_to_cpu(es->s_feature_ro_compat); + feature_incompat = le32_to_cpu(es->s_feature_incompat); + flags = le32_to_cpu(es->s_flags); - /* check for external journal device */ - if ((le32_to_cpu(es->s_feature_incompat) & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) != 0) { + /* external journal device is jbd */ + if ((feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) != 0) { volume_id_set_usage(id, VOLUME_ID_OTHER); id->type = "jbd"; - return 0; + goto found; } - /* check for ext2 / ext3 */ - volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); - if ((le32_to_cpu(es->s_feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0) + /* has journal */ + if ((feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0) { + /* "use on development code" is ext4dev */ + if ((flags & EXT2_FLAGS_TEST_FILESYS) != 0) { + id->type = "ext4dev"; + goto found; + } + + /* incompatible ext3 features is ext4 */ + if ((feature_ro_compat & EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) != 0 || + (feature_incompat & EXT3_FEATURE_INCOMPAT_UNSUPPORTED) != 0) { + id->type = "ext4"; + goto found; + } + id->type = "ext3"; - else - id->type = "ext2"; + goto found; + } else { + /* no incompatible ext2 feature is ext2 */ + if ((feature_ro_compat & EXT2_FEATURE_RO_COMPAT_UNSUPPORTED) == 0 && + (feature_incompat & EXT2_FEATURE_INCOMPAT_UNSUPPORTED) == 0) { + id->type = "ext2"; + goto found; + } + } + + return -1; +found: + volume_id_set_label_raw(id, es->s_volume_name, 16); + volume_id_set_label_string(id, es->s_volume_name, 16); + volume_id_set_uuid(id, es->s_uuid, 0, UUID_DCE); + snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u", + le32_to_cpu(es->s_rev_level), le16_to_cpu(es->s_minor_rev_level)); + + volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); return 0; }