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Re: [PATCH 10/17] hurd: add fsys_get_children


From: Neal H. Walfield
Subject: Re: [PATCH 10/17] hurd: add fsys_get_children
Date: Mon, 15 Jul 2013 11:34:38 +0200
User-agent: Wanderlust/2.14.0 (Africa) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (Goj┼Ź) APEL/10.8 Emacs/23.2 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO)

At Mon, 15 Jul 2013 10:37:37 +0200,
Samuel Thibault wrote:
> > I don't like your solution to the mtab problem.  But, as you admit,
> > it's really a solution to the fsck problem.
> 
> Not only. It's also about umount being able to know what to unmount when
> calling umount /dev/cdrom, about mount/df being able to have a list of
> mounted filesystems, etc. The fsck problem could be solved by simply
> having an exclusive lock on the underlying device node.

Then perhaps we need fsys_set_user / fsys_get_user RPCs.  When a
process begins to use a node, it can optionally register itself as a
user.  Then others can determine whether the node is being used and
who it is.  The user port would be an unauthenticated port
implementing, for instance, the fsys interface.

> > So, let's think about the
> > fsck problem.  What we need is a registry.  I propose an mtab
> > translator.  Translators register with it when they start and register
> > a call back.
> 
> Where do they register? Is this yet another well-known translator,
> outside of the filesystem? Having it distributed seems much more
> elegant.

/servers/mtab and $USER/server/mtab.

Neal



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