"btrfs subvolume list" feature request

"btrfs subvolume list" feature request

[Ali AlipourR]

Hi

I think it will be to add option to "btrfs subvolume list" command to
also show the property of sub volumes (ro, compression,...)? do this
is possible?

Thanks,
Ali

Re: "btrfs subvolume list" feature request

[Satoru Takeuchi]

Hi Ali,

(2014/12/16 11:01), Ali AlipourR wrote:
> Hi
>
> I think it will be to add option to "btrfs subvolume list" command to
> also show the property of sub volumes (ro, compression,...)? do this
> is possible?

Of course it's possible by writing some code :-D

Is "btrfs property get <subvol>" (and some one liner) insufficient for
your purpose? If you want to just list properties of each subvolumes
instead of listing properties with existing fields, it can be
accomplished as follows.

===============================================================================
# btrfs sub list /btrfstest
# btrfs sub cre /btrfstest/sub1
Create subvolume '/btrfstest/sub1'
# btrfs sub cre /btrfstest/sub2
Create subvolume '/btrfstest/sub2'
# btrfs sub list /btrfstest/
ID 382 gen 39625 top level 5 path sub1
ID 383 gen 39626 top level 5 path sub2
# for i in $(btrfs sub list /btrfstest | cut -d ' ' -f 9) ; do echo -n $i': ' ; btrfs prop get /btrfstest/$i ; done
sub1    ro=false
sub2    ro=false
===============================================================================

Thanks,
Satoru

>
> Thanks,
> Ali
> --
> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

Re: "btrfs subvolume list" feature request

[Chris Murphy]

On Mon, Dec 15, 2014 at 10:36 PM, Satoru Takeuchi
<takeuchi_satoru@jp.fujitsu.com> wrote:

> Is "btrfs property get <subvol>" (and some one liner) insufficient for
> your purpose?

I was not previously aware of btrfs property, thanks for mentioning
this. man btrfs does not list the property command; although man btrfs
property does explain it. So now I'm wondering what other commands
might not be listed in man btrfs.


-- 
Chris Murphy

Re: "btrfs subvolume list" feature request

[Satoru Takeuchi]

Hi Chris,

(2014/12/16 16:52), Chris Murphy wrote:
> On Mon, Dec 15, 2014 at 10:36 PM, Satoru Takeuchi
> <takeuchi_satoru@jp.fujitsu.com> wrote:
>
>> Is "btrfs property get <subvol>" (and some one liner) insufficient for
>> your purpose?
>
> I was not previously aware of btrfs property, thanks for mentioning
> this. man btrfs does not list the property command; although man btrfs
> property does explain it. So now I'm wondering what other commands
> might not be listed in man btrfs.

I dug into it and found that only btrfs-property is
missing subcommand, at least in devel/integration-20141204
branch.

I'll submit a patch which fixes this problem later.

Thanks,
Satoru