linux-kernel - Re: [PATCH] NFS: Replace null dentries that appear in readdir's list [try #2]

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Date:	Tue, 22 Aug 2006 11:29:29 +0800 (WST)
From:	Ian Kent <raven@...maw.net>
To:	David Howells <dhowells@...hat.com>
cc:	Andrew Morton <akpm@...l.org>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	linux-kernel@...r.kernel.org, aviro@...hat.com
Subject: Re: [PATCH] NFS: Replace null dentries that appear in readdir's list
 [try #2]

On Mon, 21 Aug 2006, David Howells wrote:

> 
> The NFS client's automounting facilities handle automatic expiration and
> implicit recursive unmounting of xdev submounts.
> 
> For example, on my test machine:
> 
> 	[root@...romeda ~]# /root/mount warthog:/ /warthog -o fsc
> 	[root@...romeda ~]# ls /warthog/warthog
> 	[root@...romeda ~]# cat /proc/mounts 
> 	...
> 	warthog:/ /warthog nfs rw,vers=3,rsize=32768,wsize=32768,hard,fsc,proto=tcp,timeo=600,retrans=2,sec=sys,addr=warthog 0 0
> 	warthog:/warthog /warthog/warthog nfs rw,vers=3,rsize=32768,wsize=32768,hard,fsc,proto=tcp,timeo=600,retrans=2,sec=sys,addr=warthog 0 0
> 	[root@...romeda ~]# umount /warthog/
> 	[root@...romeda ~]# 
> 
> The "ls" command caused the client to mount warthog:/warthog off of the server
> onto /warthog/warthog automatically.  I was then able to just unmount
> /warthog, which took away /warthog/warthog also without me having to do
> anything special.
> 

This is going to be fun after all.

There isn't any way to tell a nohide from a non-nohide mount from the 
expots list.
There are inconsistencies with the contents of /proc/mounts between OS 
versions (perhaps kernel version).
There is no way to tell a nohide mounted filesystem from the output of 
/proc/mounts if it does happen to appear in it.

*sigh*

Ian

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