From: Roman Mamedov <rm@romanrm.net>
To: Ulli Horlacher <framstag@rus.uni-stuttgart.de>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: how to extend a btrfs disk image?
Date: Thu, 17 Dec 2020 19:12:07 +0500 [thread overview]
Message-ID: <20201217191207.17243c40@natsu> (raw)
In-Reply-To: <20201217123008.GA22831@tik.uni-stuttgart.de>
On Thu, 17 Dec 2020 13:30:08 +0100
Ulli Horlacher <framstag@rus.uni-stuttgart.de> wrote:
> root@fextest:/nfs/rusnas/fex# mount disk1.btrfs /mnt/tmp
> root@fextest:/nfs/rusnas/fex# df -TH /mnt/tmp
> Filesystem Type Size Used Avail Use% Mounted on
> /dev/loop2 btrfs 16T 3.7M 16T 1% /mnt/tmp
You see here 'mount' has transparently created a 'loop device' for you in order
to mount the FS.
> Now I want to extend this filesystem, but this approach fails:
>
> root@fextest:/nfs/rusnas/fex# touch disk2.btrfs
> root@fextest:/nfs/rusnas/fex# truncate -s 16TB disk2.btrfs
> root@fextest:/nfs/rusnas/fex# btrfs device add /nfs/rusnas/fex/disk2.btrfs /mnt/tmp
> ERROR: /nfs/rusnas/fex/disk2.btrfs is not a block device
Since file is not a block device, here you have to do the same manually. See
documentation for 'losetup'.
--
With respect,
Roman
next prev parent reply other threads:[~2020-12-17 14:12 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-17 12:30 how to extend a btrfs disk image? Ulli Horlacher
2020-12-17 14:12 ` Roman Mamedov [this message]
2020-12-19 22:59 ` Ulli Horlacher
2020-12-20 9:22 ` Roman Mamedov
2020-12-20 10:35 ` Ulli Horlacher
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