From: Benjamin Coddington <bcodding@redhat.com>
Date: Mon, 18 Jul 2016 14:41:57 +0000 (-0400)
Subject: nfs: don't create zero-length requests
X-Git-Tag: v3.2.84~116
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=88d2d3999cf2fd0f5d2b4d520f322a084a4858d4;p=pandora-kernel.git

nfs: don't create zero-length requests

commit 149a4fddd0a72d526abbeac0c8deaab03559836a upstream.

NFS doesn't expect requests with wb_bytes set to zero and may make
unexpected decisions about how to handle that request at the page IO layer.
Skip request creation if we won't have any wb_bytes in the request.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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