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Date: Tue, 30 Oct 2012 19:47:28 +0800
From: ching <lsching17@gmail.com>
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To: "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: btrfs defrag problem
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Sender: linux-btrfs-owner@vger.kernel.org
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Hi all,

I try to defrag my btrfs root partition (run by root privilege)

find / -type f -o -type d -print0 | xargs --null --no-run-if-empty btrfs filesystem defragment -t $((32*1024*1024))


1. This kind of error messages is prompted:

    failed to open /bin/bash
    open:: Text file busy
    total 1 failures
    failed to open /lib64/ld-2.15.so
    open:: Text file busy
    total 1 failures
    failed to open /sbin/agetty
    open:: Text file busy
    failed to open /sbin/btrfs
    open:: Text file busy
    failed to open /sbin/dhclient
    open:: Text file busy
    failed to open /sbin/init
    open:: Text file busy
    failed to open /sbin/udevd

    It seems that locked files cannot be defragged, is it expected behaviour?

2. Btrfs Wiki mentions that defrag directory will defrag metadata, is symlink/hardlink considered as metadata?

    P.S. inline data is already disabled by "max_inline=0"

3. Is any possible to online defrag a btrfs partition without hindered by mount point/polyinstantied directories?


Thank you.

ching