From 568e8c494ded95a28c5dd8b79b4d3ffb95b6d845 Mon Sep 17 00:00:00 2001
From: Andy Adamson <andros@netapp.com>
Date: Tue, 1 Mar 2011 01:34:22 +0000
Subject: [PATCH] NFSv4.1: turn off pNFS on ds connection failure

If a data server is unavailable, go through MDS.

Mark the deviceid containing the data server as a negative cache entry.
Do not try to connect to any data server on a deviceid marked as a negative
cache entry. Mark any layout that tries to use the marked deviceid as failed.

Inodes with a layout marked as fails will not use the layout for I/O, and will
not perform any more layoutgets.
Inodes without a layout will still do layoutget, but the layout will get
marked immediately.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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Reading git-format-patch failed