From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chester <somethingsome2000@gmail.com>
Subject: Re: What are thoses [btrfs-cache-nnn] kernel threads ?
Date: Fri, 20 May 2011 00:32:22 -0500
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Cc: Josef Bacik <josef@redhat.com>,
	linux-btrfs <linux-btrfs@vger.kernel.org>
To: Miguel Garrido <miguel@mjgar.com>
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>
> Out of curiosity, why isn't this done automatically as opposed to
> having to mount with the space_cache option?

The space_cache option changes the disk format. Once enabled, it will
be permanent. The mount option gives people an option of whether they
want to enable space_cache.. I've been using it, and it's pretty safe
to use.