From: J. Bruce Fields <bfields@redhat.com>
Date: Sat, 22 Mar 2014 19:15:11 +0000 (-0400)
Subject: nfsd4: reserve space before inlining 0-copy pages
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~67^2~58
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4e21ac4b6f1d09c56f7d10916eaa738361214ab7;p=pandora-kernel.git

nfsd4: reserve space before inlining 0-copy pages

Once we've included page-cache pages in the encoding it's difficult to
remove them and restart encoding.  (xdr_truncate_encode doesn't handle
that case.)  So, make sure we'll have adequate space to finish the
operation first.

For now COMPOUND_SLACK_SPACE checks should prevent this case happening,
but we want to remove those checks.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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