linux-ext4 - [PATCH] blkid: recognize ext4(dev) without journal

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Date:	Tue, 24 Feb 2009 23:17:54 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: [PATCH] blkid: recognize ext4(dev) without journal

ext4/ext4dev no longer require a journal.

w/o this blkid doesn't recognize after:

# mkfs.ext4 /dev/blah
# tune2fs -O ^has_journal
# blkid /dev/blah

We still must have one ext3-incompat-feature to flag
as ext4(dev) so we shouldn't ever mis-recognize it.

Signed-off-by: Eric Sandeen <sandeen@...hat.com>
---

Index: e2fsprogs/lib/blkid/probe.c
===================================================================
--- e2fsprogs.orig/lib/blkid/probe.c
+++ e2fsprogs/lib/blkid/probe.c
@@ -281,11 +281,6 @@ static int probe_ext4dev(struct blkid_pr
 	    EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
 		return -BLKID_ERR_PARAM;
 
-	/* ext4dev requires a journal */
-	if (!(blkid_le32(es->s_feature_compat) &
-	      EXT3_FEATURE_COMPAT_HAS_JOURNAL))
-		return -BLKID_ERR_PARAM;
-
 	/*
 	 * If the filesystem is marked as OK for use by in-development
 	 * filesystem code, but ext4dev is not supported, and ext4 is,
@@ -317,11 +312,6 @@ static int probe_ext4(struct blkid_probe
 	    EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
 		return -BLKID_ERR_PARAM;
 
-	/* ext4 requires journal */
-	if (!(blkid_le32(es->s_feature_compat) &
-	      EXT3_FEATURE_COMPAT_HAS_JOURNAL))
-		return -BLKID_ERR_PARAM;
-
 	/* Ext4 has at least one feature which ext3 doesn't understand */
 	if (!(blkid_le32(es->s_feature_ro_compat) &
 	      EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) &&

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