From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tomasz Chmielewski <tch@wpkg.org>
Subject: btrfs defragment: ioctl failed, ret -1 errno 28
Date: Tue, 18 Oct 2011 12:50:02 +0200
Message-ID: <4E9D59DA.4000403@wpkg.org>
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To: linux-btrfs <linux-btrfs@vger.kernel.org>
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I'm trying to defragment a 280 GB file when running 3.1.0-rc9 kernel:

# filefrag /mnt/btrfs/images/srv1-backup.qcow2
/mnt/btrfs/images/srv1-backup.qcow2: 1139699 extents found


# btrfs filesystem defragment /mnt/btrfs/images/srv1-backup.qcow2
ioctl failed on /mnt/btrfs/images/srv1-backup.qcow2 ret -1 errno 28
total 1 failures


Some files fail to defragment like this; some are defragmented correctly.

Why does it fail?


-- 
Tomasz Chmielewski
http://wpkg.org