* btrfs subvolume mount with different options
@ 2018-01-12 17:49 Konstantin V. Gavrilenko
2018-01-12 20:27 ` Timofey Titovets
2018-01-12 20:37 ` Roman Mamedov
0 siblings, 2 replies; 4+ messages in thread
From: Konstantin V. Gavrilenko @ 2018-01-12 17:49 UTC (permalink / raw)
To: Linux fs Btrfs
Hi list,
just wondering whether it is possible to mount two subvolumes with different mount options, i.e.
|
|- /a defaults,compress-force=lza
|
|- /b defaults,nodatacow
since, when both subvolumes are mounted, and when I change the option for one it is changed for all of them.
thanks in advance.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: btrfs subvolume mount with different options
2018-01-12 17:49 btrfs subvolume mount with different options Konstantin V. Gavrilenko
@ 2018-01-12 20:27 ` Timofey Titovets
2018-01-12 20:37 ` Roman Mamedov
1 sibling, 0 replies; 4+ messages in thread
From: Timofey Titovets @ 2018-01-12 20:27 UTC (permalink / raw)
To: Konstantin V. Gavrilenko; +Cc: Linux fs Btrfs
2018-01-12 20:49 GMT+03:00 Konstantin V. Gavrilenko <k.gavrilenko@arhont.com>:
> Hi list,
>
> just wondering whether it is possible to mount two subvolumes with different mount options, i.e.
>
> |
> |- /a defaults,compress-force=lza
> |
> |- /b defaults,nodatacow
>
>
> since, when both subvolumes are mounted, and when I change the option for one it is changed for all of them.
>
>
> thanks in advance.
>
> --
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Not possible for now.
--
Have a nice day,
Timofey.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: btrfs subvolume mount with different options
2018-01-12 17:49 btrfs subvolume mount with different options Konstantin V. Gavrilenko
2018-01-12 20:27 ` Timofey Titovets
@ 2018-01-12 20:37 ` Roman Mamedov
2018-01-15 13:57 ` Konstantin V. Gavrilenko
1 sibling, 1 reply; 4+ messages in thread
From: Roman Mamedov @ 2018-01-12 20:37 UTC (permalink / raw)
To: Konstantin V. Gavrilenko; +Cc: Linux fs Btrfs
On Fri, 12 Jan 2018 17:49:38 +0000 (GMT)
"Konstantin V. Gavrilenko" <k.gavrilenko@arhont.com> wrote:
> Hi list,
>
> just wondering whether it is possible to mount two subvolumes with different mount options, i.e.
>
> |
> |- /a defaults,compress-force=lza
You can have use different compression algorithms across the filesystem
(including none), via "btrfs properties" on directories or subvolumes. They
are inherited down the tree.
$ mkdir test
$ sudo btrfs prop set test compression zstd
$ echo abc > test/def
$ sudo btrfs prop get test/def compression
compression=zstd
But it appears this doesn't provide a way to apply compress-force.
> |- /b defaults,nodatacow
Nodatacow can be applied to any dir/subvolume recursively, or any file (as long as it's created but not
written yet) via chattr +C.
--
With respect,
Roman
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: btrfs subvolume mount with different options
2018-01-12 20:37 ` Roman Mamedov
@ 2018-01-15 13:57 ` Konstantin V. Gavrilenko
0 siblings, 0 replies; 4+ messages in thread
From: Konstantin V. Gavrilenko @ 2018-01-15 13:57 UTC (permalink / raw)
To: Linux fs Btrfs; +Cc: Roman Mamedov
Thanks, chattr +C is that's what I am currently using.
Also you already answered my next question, why it is not possible to set +C attribute on the existing file :)
Yours sincerely,
Konstantin V. Gavrilenko
----- Original Message -----
From: "Roman Mamedov" <rm@romanrm.net>
To: "Konstantin V. Gavrilenko" <k.gavrilenko@arhont.com>
Cc: "Linux fs Btrfs" <linux-btrfs@vger.kernel.org>
Sent: Friday, 12 January, 2018 9:37:49 PM
Subject: Re: btrfs subvolume mount with different options
On Fri, 12 Jan 2018 17:49:38 +0000 (GMT)
"Konstantin V. Gavrilenko" <k.gavrilenko@arhont.com> wrote:
> Hi list,
>
> just wondering whether it is possible to mount two subvolumes with different mount options, i.e.
>
> |
> |- /a defaults,compress-force=lza
You can have use different compression algorithms across the filesystem
(including none), via "btrfs properties" on directories or subvolumes. They
are inherited down the tree.
$ mkdir test
$ sudo btrfs prop set test compression zstd
$ echo abc > test/def
$ sudo btrfs prop get test/def compression
compression=zstd
But it appears this doesn't provide a way to apply compress-force.
> |- /b defaults,nodatacow
Nodatacow can be applied to any dir/subvolume recursively, or any file (as long as it's created but not
written yet) via chattr +C.
--
With respect,
Roman
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^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2018-01-15 13:57 UTC | newest]
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2018-01-12 17:49 btrfs subvolume mount with different options Konstantin V. Gavrilenko
2018-01-12 20:27 ` Timofey Titovets
2018-01-12 20:37 ` Roman Mamedov
2018-01-15 13:57 ` Konstantin V. Gavrilenko
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