[RFC][PATCH] Set JBD2_FEATURE_INCOMPAT_64BIT on filesystems larger than 32-bit blocks (take 2).

["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>
---
 fs/ext4/super.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

Index: linux-2.6.22-rc3/fs/ext4/super.c
===================================================================
--- linux-2.6.22-rc3.orig/fs/ext4/super.c	2007-06-04 11:01:20.028360650 -0500
+++ linux-2.6.22-rc3/fs/ext4/super.c	2007-06-04 11:05:11.389126418 -0500
@@ -1824,6 +1824,17 @@ static int ext4_fill_super (struct super
 		goto failed_mount3;
 	}
 
+        /*
+	 * Make sure to set JBD2_FEATURE_INCOMPAT_64BIT on filesystems
+	 * with more that 32-bit block counts
+	 */
+	if(es->s_blocks_count_hi &&
+	   !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)) {


Thanks
-JRS