linux-ext4 - [PATCH] ext4: enable the 64-bit jbd2 feature based on the 64-bit ext4 feature

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Date:	Mon, 21 May 2012 11:42:50 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc:	Theodore Ts'o <tytso@....edu>
Subject: [PATCH] ext4: enable the 64-bit jbd2 feature based on the 64-bit ext4 feature

Previously we were only enabling the 64-bit jbd2 feature if the number
of blocks in the file system was greater 2**32-1.  The problem with
this is that it makes it harder to test the 64-bit journal code paths
with small file systems, since a small test file system would with the
64-bit ext4 feature enable would use a 64-bit file system on-disk data
structures, but use a 32-bit journal.

This would also cause problems when trying to do an online resize to
grow the filesystem above the 2**32-1 boundary.  Fortunately the patch
to support online resize for 64-bit file systems hasn't been merged
yet, so this problem hasn't arisen in practice.

Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
 fs/ext4/super.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index c18c596..88c2054 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3603,7 +3603,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 		goto no_journal;
 	}

-	if (ext4_blocks_count(es) > 0xffffffffULL &&
+	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
 	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
 				       JBD2_FEATURE_INCOMPAT_64BIT)) {
 		ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
-- 
1.7.10.rc3

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