linux-ext4 - Ext4 tail merging?

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Message-ID: <5499DFE5.60508@ubuntu.com>
Date:	Tue, 23 Dec 2014 16:34:29 -0500
From:	Phillip Susi <psusi@...ntu.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Ext4 tail merging?

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Ext4 still does not support tail merging right?  I had a user post
this filefrag output and was surprised to see that it says the merged
flag is set.  How can this be?

$ filefrag -v /boot/grub/grubenv
Filesystem type is: ef53
Filesystem cylinder groups approximately 19
File size of /boot/grub/grubenv is 1024 (1 block of 4096 bytes)
 ext: logical_offset: physical_offset: length: expected: flags:
   0: 0.. 0: 494592.. 494592: 1: merged,eof
/boot/grub/grubenv: 1 extent found, perfection would be -1 extent

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