Re: [EXT4 set 2][PATCH 3/5] cleanups: set_jbd2_64bit_feature for >16TB ext4 fs

["Jose R. Santos" <jrs@us.ibm.com>]

Set the journals JBD2_FEATURE_INCOMPAT_64BIT on devices with more
than 32bit block sizes during mount time.  This ensure proper record
lenth when writing to the journal.

Signed-off-by: Jose R. Santos <jrs@us.ibm.com>
Signed-off-by: Andreas Dilger <adilger@clusterfs.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
---
 fs/ext4/super.c |    7 	7 +	0 -	0 !
 1 file changed, 7 insertions(+)

Index: linux-2.6/fs/ext4/super.c
===================================================================
--- linux-2.6.orig/fs/ext4/super.c	2007-07-11 09:36:00.000000000 -0500
+++ linux-2.6/fs/ext4/super.c	2007-07-11 09:36:20.000000000 -0500
@@ -1804,6 +1804,13 @@ static int ext4_fill_super (struct super
 		goto failed_mount3;
 	}
 
+	if (ext4_blocks_count(es) > 0xffffffffULL &&
+	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
+				       JBD2_FEATURE_INCOMPAT_64BIT)) {
+		printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
+		goto failed_mount4;
+	}
+
 	/* We have now updated the journal if required, so we can
 	 * validate the data journaling mode. */
 	switch (test_opt(sb, DATA_FLAGS)) {