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Date: Mon, 01 Dec 2014 09:19:22 -0800
From: Robert White <rwhite@pobox.com>
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To: Shriramana Sharma <samjnaa@gmail.com>, MegaBrutal <megabrutal@gmail.com>
CC: linux-btrfs <linux-btrfs@vger.kernel.org>, Roman Mamedov <rm@romanrm.net>,
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Subject: Re: Possible to undo subvol delete?
References: <CAH-HCWW+C9VSV0vb5D1SfU+5md8=zfrZiAbK4cqFiGFW4bKR4w@mail.gmail.com> <20141130042306.GE8916@merlins.org> <547C6922.6030206@gmail.com> <CAE8gLhmn3aX88t1FO2=BnHXk0-+2xQ4dnW57dga93iA-bFaUzQ@mail.gmail.com> <20141201184749.0fd67b62@natsu> <CAE8gLhnyTWjfTk-W+BHdfovV8pJH-yqo7joR+kf6vgs1FU00hw@mail.gmail.com> <CAH-HCWWZ4FXHtb42dVOaKtLzmndc=e_LAqrufUZRt36CD_g34g@mail.gmail.com>
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On 12/01/2014 08:40 AM, Shriramana Sharma wrote:
> IIUC you can only specify RO while creating but you can always cheaply
> create a RW snapshot of an RO one or an RO snapshot of an RW one...

You can turn ReadOnly status on and off (er. "true" and "false") with 
btrfs property get/set ro=true/false /path/to/subvolume