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volume_id: ext4 detection

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This commit is contained in:
Kay Sievers 2007-07-08 17:25:55 +02:00
parent 2e23125e11
commit 2e08169ed4
1 changed files with 28 additions and 9 deletions
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37
extras/volume_id/lib/ext.c
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@ -63,8 +63,12 @@ struct ext2_super_block {
} PACKED;
#define EXT_SUPER_MAGIC 0xEF53
#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x00000004
#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x00000008
#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 EXT_SUPERBLOCK_OFFSET 0x400
#define EXT3_MIN_BLOCK_SIZE 0x400
@ -74,6 +78,8 @@ 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_incompat;
info("probing at offset 0x%llx", (unsigned long long) off);
@ -97,19 +103,32 @@ int volume_id_probe_ext(struct volume_id *id, uint64_t off, uint64_t size)
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_incompat = le32_to_cpu(es->s_feature_incompat);
/* check for external journal device */
if ((le32_to_cpu(es->s_feature_incompat) & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) != 0) {
if ((feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) != 0) {
volume_id_set_usage(id, VOLUME_ID_OTHER);
id->type = "jbd";
return 0;
goto out;
}
/* 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)
id->type = "ext3";
else
id->type = "ext2";
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;
}
if ((feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0) {
id->type = "ext3";
goto out;
}
id->type = "ext2";
out:
return 0;
}