linux-kernel - Re: Feature request, "create on mount" to create mount point directory on mount, implied remove on unmount

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Message-ID: <20150715143830.GG31997@ws.net.home>
Date:	Wed, 15 Jul 2015 16:38:30 +0200
From:	Karel Zak <kzak@...hat.com>
To:	jon <jon@...shouse.co.uk>
Cc:	Valdis.Kletnieks@...edu, coreutils@....org,
	linux-kernel@...r.kernel.org
Subject: Re: Feature request, "create on mount" to create mount point
 directory on mount, implied remove on unmount

On Sat, Jul 04, 2015 at 11:48:28PM +0100, jon wrote:
> It solves these problems:
> 1) It solves the problem of processes writing data into the mount point
> when not mounted (as does, I accept a user space automounter, but as I
> explained the usage scenario differs). 
> 
> 2) It would be useful for embedded devices, installers etc.  I do quite
> a bit of work in the embedded space, sometimes running kernel+shell+user
> process only, sometimes no udev, no systemd, not even full fat init.  
> 
> 3) installers or similar could use such an option for mounting install
> data. By specifying the flag user space processes can infer that the FS
> is successfully mounted by the presence of the mount point without the
> need to explicitly code against an event system or parse log files. 
> 
> 3) Users can use it to have a slightly improved new mount behaviour and
> also hopefully be used as a flag to indicate that "oh so clever user
> space managers" should stay away entries using it in fstab.

 man mount (since util-linux v2.23, May 2013):

   x-mount.mkdir[=mode]    Allow to make a target directory (mountpoint).  

 It's userspace mount(8) option and you can use it in your fstab.

    Karel

-- 
 Karel Zak  <kzak@...hat.com>
 http://karelzak.blogspot.com
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