From: Peng Tao <tao.peng@primarydata.com>
Date: Fri, 12 Sep 2014 03:04:10 +0000 (+0800)
Subject: nfs41: change PNFS_LAYOUTRET_ON_SETATTR to only return on truncation to smaller size
X-Git-Tag: fixes-for-v3.18-merge-window~10^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=88ac815cdbef93dec8382b3531ef90474dd102f2;p=pandora-kernel.git

nfs41: change PNFS_LAYOUTRET_ON_SETATTR to only return on truncation to smaller size

Both blocks layout and objects layout want to use it to avoid CB_LAYOUTRECALL
but that should only happen if client is doing truncation to a smaller size.
For other cases, we let server decide if it wants to recall client's layouts.
Change PNFS_LAYOUTRET_ON_SETATTR to follow the logic and not to send
layoutreturn unnecessarily.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Boaz Harrosh <boaz@plexistor.com>
Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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