linux-kernel - Re: request for patches: showing mount options

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Date:	Fri, 27 Jul 2007 23:30:56 +0800
From:	Ian Kent <raven@...maw.net>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, kzak@...hat.com, ericvh@...il.com,
	lucho@...kov.net, zippel@...ux-m68k.org, hpa@...or.com,
	rathamahata@...4.ru, dhowells@...hat.com, sfrench@...ba.org,
	mhalcrow@...ibm.com, phillip@...lewell.homeip.net,
	hirofumi@...l.parknet.co.jp, mikulas@...ax.karlin.mff.cuni.cz,
	wli@...omorphy.com, shaggy@...tin.ibm.com, vandrove@...cvut.cz,
	trond.myklebust@....uio.no, aia21@...tab.net,
	mark.fasheh@...cle.com, kurt.hackel@...cle.com,
	reiserfs-devel@...r.kernel.org, bfennema@...con.csc.calpoly.edu,
	dushistov@...l.ru, xfs-masters@....sgi.com, arnd@...db.de,
	holzheu@...ibm.com
Subject: Re: request for patches: showing mount options

On Fri, 2007-07-27 at 15:45 +0200, Miklos Szeredi wrote:
> [please consider pruning the CC list if discussing some aspect, which
> doesn't concern all]
> 
> I've done an audit of all filesystems with regards to showing mount
> options in /proc/<pid>/mounts.  Unfortunately most of them show none
> or only a part of all accepted options (for details see list of
> filesystems at the end of the mail).
> 
> This is currently not a big problem, because mount(8) stores the given
> options in /etc/mtab.  However we want to get rid of mtab, and this
> requires, that the option showing be fixed up.
> 
> It would be easiest if this was done by the VFS instead of having to
> deal with it in filesystems.  However there are differences in how
> filesytems handle options during mount and remount, and it would be
> impossible to take this into account in all cases.
> 
> If you are CC-ed, and responsible for one of these filesystems, please
> take a moment to fully implement the ->show_options() method.  In most
> cases it should be an easy task.
> 
> If for some reason you are unable to do this, please let me know and
> I'll fix it up.
> 
> Here are some guidelines for showing options.  I'll also add these to
> Documentation/filesystems/vfs.txt
> 
> +   If a filesystem accepts mount options, it must define show_options()
> +   to show all the currently active options.  The rules are:
> +
> +     - options MUST be shown which are not default or their values differ
> +       from the default
> +
> +     - options MAY be shown which are enabled by default or have their
> +       default value
> +
> +   Options used only internally between a mount helper and the kernel
> +   (such as file descriptors), or which only have an effect during the
> +   mounting (such as ones controlling the creation of a journal) are exempt
> +   from the above rules.
> 
> Thanks,
> Miklos
> 
> -------
> legend:
> 
>   all - fs has options, but doesn't define ->show_options()
>   some - fs defines ->show_options(), but some options are not shown
>   noopt - fs does not have options
>   good - fs shows all options
>   patch - I have a patch
> 
> 
> 9p          some
> adfs        all (maintainer?)
> affs        all
> afs         all
> autofs      all

I'm not sure I understand this.
How does autofs show it's options without a ->show_options method?

> autofs4     some

OK, uid and gid aren't shown.
That should be straight forward to fix.
What's your time frame for this?

Ian


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