linux-kernel - Re: [PATCH v2] Btrfs: allow mount -o remount,compress=no

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Date:	Fri, 13 Jul 2012 10:19:14 -0500
From:	Mitch Harder <mitch.harder@...ayonlinux.org>
To:	dave@...os.cz, Arnd Hannemann <arnd@...dnet.de>,
	chris.mason@...ionio.com, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, ierdnah@...il.com
Subject: Re: [PATCH v2] Btrfs: allow mount -o remount,compress=no

On Thu, Jun 28, 2012 at 10:40 AM, David Sterba <dave@...os.cz> wrote:
> On Tue, Jun 26, 2012 at 08:48:37AM +0200, Arnd Hannemann wrote:
>> How show should we proceed to get above mentioned patch
>> (or the similar patch from Andrei Popa) merged?
>
> Josef picked the patch into btrfs-next, I see not problem to include it
> in next merge window patchset.
>

I was testing the lz4(hc) patches, and I found the the compression
INCOMPAT flags are not being updated using the method in this patch.

The compression INCOMPAT flags are generally checked and updated in
the open_ctree() function.

But, on remount, open_ctree() is not called.

I was going to test a patch to update the INCOMPAT flags similar to
the way lzo INCOMPAT is updated when specifying the compress method in
defragmentation.

http://kerneltrap.org/mailarchive/linux-btrfs/2010/11/18/6886194

But, let me know if it is preferred to just return -EINVAL when trying
to remount with a compression method that has an INCOMPAT not yet seen
by that volume.
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