Re: Possible to undo subvol delete?

[Austin S Hemmelgarn <ahferroin7@gmail.com>]

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On 2014-12-01 08:54, MegaBrutal wrote:
> 2014-12-01 14:47 GMT+01:00 Roman Mamedov <rm@romanrm.net>:
>> On Mon, 1 Dec 2014 14:38:16 +0100
>> MegaBrutal <megabrutal@gmail.com> wrote:
>>
>>> I've also noticed, a subvolume can just be deleted with an "rm -r",
>>> just like an ordinary directory. I'd consider to only allow subvolume
>>> deletions with exact "btrfs subvolume delete" commands, and they
>>
>> This is already the case. 'rm -r' will remove all files in a subvolume, but
>> the empty subvolume itself is only deletable via the 'btrfs' command.
>
> That's great! And there is no way to protect against recursive
> deletions (besides setting the subvolume read-only, as you suggested
> below), as files are processes individually by "rm". But it's OK,
> people should always be very careful with "rm", and it doesn't change
> with btrfs. ;)
>
>
>> If you want to make snapshots which can't be removed by ordinary tools, use
>> the 'read-only' mode when creating them.
>
> Yeah, good idea! Anyway, is it possible to change a read-only snapshot
> to read-write and vica-versa, or you can only specify read-only while
> creating them?
>
IIRC, there is something that you can do with the properties interface.
Personally though, I just make the snapshot RW to start with, and then 
recursively make it immutable (chattr -r +I), as I never use immutable 
files for anything else, and it works on any _sane_ filesystem, not just 
btrfs.


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