/*
* volume_id - reads filesystem label and uuid
*
- * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2008 Theodore Ts'o <tytso@mit.edu>
+ *
+ * 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
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 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_EXTENTS 0x0040
-#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
-#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
+#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
-#define EXT_SUPERBLOCK_OFFSET 0x400
+#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
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);
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 */
+ /* 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";
- goto out;
- }
-
- volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
-
- if ((feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) != 0 ||
- (feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) != 0 ||
- (feature_incompat & EXT4_FEATURE_INCOMPAT_MMP) != 0) {
- id->type = "ext4";
- goto out;
+ goto found;
}
+ /* 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";
- goto out;
+ 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;
+ }
}
- id->type = "ext2";
+ 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));
-out:
+ volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
return 0;
}
~ianmdlvl / elogind.git / blobdiff