From: "Rüdiger Meier" <sweet_f_a@gmx.de>
To: Karel Zak <kzak@redhat.com>
Cc: util-linux@vger.kernel.org
Subject: Re: find device of a known mountpoint
Date: Fri, 31 Mar 2017 12:03:02 +0200 [thread overview]
Message-ID: <cabd1dc9-8eff-8000-ed3b-39c0463ae376@gmx.de> (raw)
In-Reply-To: <20170331091925.mpwmxxk4da4lsegr@ws.net.home>
On 03/31/2017 11:19 AM, Karel Zak wrote:
> On Fri, Mar 31, 2017 at 11:00:24AM +0200, Rüdiger Meier wrote:
>> $ truncate -s100M /tmp/img
>> $ losetup /dev/loop0 /tmp/img
>> $ mkfs.ext2 /dev/loop0
>>
>> $ mkdir /tmp/mnt
>> $ ln -s /tmp /tmp/xyz/symlink
>>
>> $ mount /dev/loop0 /tmp/xyz/symlink/mnt
>> $ mount | grep loop
>> /dev/loop0 on /tmp/mnt type ext2 ...
>>
>>
>> I need a command which outputs "/dev/loop0" when "/tmp/xyz/symlink/mnt" is
>> given.
>
> $ findmnt -no SOURCE /tmp/xyz/symlink/mnt
> /dev/loop0
Thank's. Now I remember that you have told me that already one day. :)
>
> Note that for bind mounts there is nothing like primary (original)
> and secondary mountpoints. It's two ways to the same filesystem.
Yep in this case the problem was only duplicate mountpoints when you
mount something on a subdir a shared bind mount. I'll send a petch for
one libmount test. I really hate that systemd defaults to shared ...
cu,
Rudi
next prev parent reply other threads:[~2017-03-31 10:03 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-31 9:00 find device of a known mountpoint Rüdiger Meier
2017-03-31 9:19 ` Karel Zak
2017-03-31 10:03 ` Rüdiger Meier [this message]
2017-03-31 10:41 ` Rüdiger Meier
2017-03-31 10:54 ` Karel Zak
2017-03-31 11:20 ` Rüdiger Meier
2017-03-31 10:09 ` [PATCH] test: fix mountpoint device check in libmount/loop Ruediger Meier
2017-03-31 10:57 ` Karel Zak
2017-03-31 11:01 ` Rüdiger Meier
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