linux-ext4 - [RFC][PATCH] Set JBD2_FEATURE_INCOMPAT_64BIT on filesystems larger than 32-bit blocks.

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Date:	Fri, 1 Jun 2007 10:52:34 -0500
From:	"Jose R. Santos" <jrs@...ibm.com>
To:	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: [RFC][PATCH] Set JBD2_FEATURE_INCOMPAT_64BIT on filesystems larger
 than 32-bit blocks.

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@...ibm.com>

--- .pc/ext4-set_64-bit_JBD_incompat.patch/fs/ext4/super.c	2007-05-31 22:25:21.843984697 -0500
+++ fs/ext4/super.c	2007-05-31 22:26:14.913670672 -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)
+		if (!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
-
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