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Re: [PATCH 10/18] nfsd: implement pNFS layout recalls

To: "J. Bruce Fields" <bfields@xxxxxxxxxxxx>
Subject: Re: [PATCH 10/18] nfsd: implement pNFS layout recalls
From: Christoph Hellwig <hch@xxxxxx>
Date: Tue, 6 Jan 2015 18:42:14 +0100
Cc: Christoph Hellwig <hch@xxxxxx>, Jeff Layton <jlayton@xxxxxxxxxxxxxxx>, linux-nfs@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20150106172508.GE12067@xxxxxxxxxxxx>
References: <1420561721-9150-1-git-send-email-hch@xxxxxx> <1420561721-9150-11-git-send-email-hch@xxxxxx> <20150106172508.GE12067@xxxxxxxxxxxx>
User-agent: Mutt/1.5.17 (2007-11-01)
> This bothers me a little: cl_addr is just the address that the
> exchange_id came from.  In theory there's no one-to-one relationship
> between NFSv4 clients and IP addresses.  Is it likely the iscsi traffic
> could use a different interface than the MDS traffic?
> 
> If this is the best we can do, then maybe this should at least be
> documented.

The pNFS block fencing protocol bothers me a lot, it seems like very
little thought went into that part of the standard.

I proposed a new SCSI layout type that fixes those issues on the
NFSv4 WG list, but there's been zero interest in it:

http://www.ietf.org/mail-archive/web/nfsv4/current/msg13469.html

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