From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Fri, 10 Jun 2011 17:30:22 +0000 (-0400)
Subject: NFSv4.1: Fix some issues with pnfs_generic_pg_test
X-Git-Tag: v3.0-rc5~51^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8f7d5efbef8718a774ac5e347b4ec069f17fd9b4;p=pandora-kernel.git

NFSv4.1: Fix some issues with pnfs_generic_pg_test

1. If the intention is to coalesce requests 'prev' and 'req' then we
   have to ensure at least that we have a layout starting at
   req_offset(prev).

2. If we're only requesting a minimal layout of length desc->pg_count,
   we need to test the length actually returned by the server before
   we allow the coalescing to occur.

3. We need to deal correctly with (pgio->lseg == NULL)

4. Fixup the test guarding the pnfs_update_layout.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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