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Message-ID: <4796780F.1000603@redhat.com>
Date: Tue, 22 Jan 2008 17:11:11 -0600
From: Eric Sandeen <sandeen@...hat.com>
To: ext4 development <linux-ext4@...r.kernel.org>
Subject: [PATCH e2fsprogs] teach libblkid about ext4(dev)
Returns ext4dev for now; will need to change to ext4 at the appropriate
time I guess.
Signed-off-by: Eric Sandeen <sandeen@...hat.com>
---
Index: e2fsprogs-1.40.4/lib/blkid/probe.c
===================================================================
--- e2fsprogs-1.40.4.orig/lib/blkid/probe.c
+++ e2fsprogs-1.40.4/lib/blkid/probe.c
@@ -148,6 +148,38 @@ static void get_ext2_info(blkid_dev dev,
set_uuid(dev, es->s_uuid, 0);
}
+static int probe_ext4(struct blkid_probe *probe,
+ struct blkid_magic *id __BLKID_ATTR((unused)),
+ unsigned char *buf)
+{
+ struct ext2_super_block *es;
+ es = (struct ext2_super_block *)buf;
+
+ /* Distinguish between jbd and ext2/3/4 fs */
+ if (blkid_le32(es->s_feature_incompat) &
+ EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
+ return -BLKID_ERR_PARAM;
+
+ /* Distinguish between ext3/4 and ext2 */
+ if (!(blkid_le32(es->s_feature_compat) &
+ EXT3_FEATURE_COMPAT_HAS_JOURNAL))
+ return -BLKID_ERR_PARAM;
+
+ /* Distinguish between ext4 and ext3 */
+ if (!(blkid_le32(es->s_feature_ro_compat) &
+ EXT4_FEATURES_RO_COMPAT) &&
+ !(blkid_le32(es->s_feature_incompat) &
+ EXT4_FEATURES_INCOMPAT))
+ return -BLKID_ERR_PARAM;
+
+ get_ext2_info(probe->dev, buf);
+
+ if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
+ !uuid_is_null(es->s_journal_uuid))
+ set_uuid(probe->dev, es->s_journal_uuid, "EXT_JOURNAL");
+
+ return 0;
+}
static int probe_ext3(struct blkid_probe *probe,
struct blkid_magic *id __BLKID_ATTR((unused)),
unsigned char *buf)
@@ -833,6 +865,7 @@ static struct blkid_magic type_array[] =
{ "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm },
{ "ntfs", 0, 3, 8, "NTFS ", probe_ntfs },
{ "jbd", 1, 0x38, 2, "\123\357", probe_jbd },
+ { "ext4dev", 1, 0x38, 2, "\123\357", probe_ext4 },
{ "ext3", 1, 0x38, 2, "\123\357", probe_ext3 },
{ "ext2", 1, 0x38, 2, "\123\357", probe_ext2 },
{ "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs },
Index: e2fsprogs-1.40.4/lib/blkid/probe.h
===================================================================
--- e2fsprogs-1.40.4.orig/lib/blkid/probe.h
+++ e2fsprogs-1.40.4/lib/blkid/probe.h
@@ -88,6 +88,26 @@ struct ext2_super_block {
#define EXT3_FEATURE_INCOMPAT_RECOVER 0x00000004
#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x00000008
+#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
+
+#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 EXT4_FEATURES_RO_COMPAT (EXT4_FEATURE_RO_COMPAT_HUGE_FILE| \
+ EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
+ EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \
+ EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)
+
+#define EXT4_FEATURES_INCOMPAT (EXT4_FEATURE_INCOMPAT_EXTENTS| \
+ EXT4_FEATURE_INCOMPAT_64BIT| \
+ EXT4_FEATURE_INCOMPAT_MMP| \
+ EXT4_FEATURE_INCOMPAT_FLEX_BG)
+
struct xfs_super_block {
unsigned char xs_magic[4];
__u32 xs_blocksize;
-
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