linux-kernel - Re: Change in multiple NFS mount behavior in 2.6.19?

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Date:	Fri, 15 Dec 2006 21:28:35 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Mike Accetta <maccetta@...relnetworks.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Change in multiple NFS mount behavior in 2.6.19?

On Fri, 15 Dec 2006 23:46:28 -0500 Mike Accetta wrote:

> After upgrading an NFS client from 2.6.18 to 2.6.19 (and also with 
> 2.6.19.1) we see a change in behavior of multiple NFS mounts against the 
> same server (running 2.4.20 in this case).  With 2.6.18 we could mount 
> different pieces of the same remote file system with distinct read-only 
> and read-write attributes at corresponding places on the client.  With 
> 2.6.19 if the first mount is read-only, subsequent mounts seem to 
> inherit the read-only status even though not explicitly mounted read-only.
> 
> If I did the "git bisect" properly, the behavior changed with commit
> 54ceac4515986030c2502960be620198dd8fe25b and the description of this 
> commit seems like it could indeed have caused this behavior, but perhaps 
> not intentionally. I believe the client is making NFS V2 calls. Also, I 
> am still able to issue a "mount -o remount,rw" on the client to regain 
> read-write capability.  Was this a regression or is this now the 
> expected behavior for multiple NFS client mounts in 2.6.19?
> -- 

That would correspond to this bugzilla item, which explains
that multiple mount semantics for one filesystem are all shared.

http://bugzilla.kernel.org/show_bug.cgi?id=7655

---
~Randy
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