[Cluster-devel] Re: [NFS] [RFC PATCH 1/3] NLM lock failover - lock release

[Chuck Lever]

On 6/29/06, Wendy Cheng <wcheng at redhat.com> wrote:
> The patch piggy-backs the logic into "rq_daddr" field of struct svc_rqst
> where NFS server ip address is stored. Upon writing IPv4 address in
> standard dot notation into /proc/fs/nfsd/nlm_unlock, the logic will
> examine NLM's global nlm_files list and subsequently unlock the
> associated file if server ip address matches.
>
> Due to the size of rq_daddr (u32), we would not be able to support IPV6
> for this round of changes. Another to-do item is to enable client:server
> ip pairs to allow NFS V4 failover.

FYI: I have a patch in my IPv6 patchset that increases the size of
this field specifically in order to hold an IPv6 address.  See:

   http://oss.oracle.com/~cel/linux-2.6/2.6.17/patches/52-svc-rq_daddr.diff

for the individual patch, and surrounding patches for more context.

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