From: J. Bruce Fields <bfields@redhat.com>
Date: Thu, 30 Jan 2014 22:18:38 +0000 (-0500)
Subject: nfsd4: teach encoders to handle reserve_space failures
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~67^2~59
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d0a381dd0eda1cc769a5762d0eed4d0d662219f2;p=pandora-kernel.git

nfsd4: teach encoders to handle reserve_space failures

We've tried to prevent running out of space with COMPOUND_SLACK_SPACE
and special checking in those operations (getattr) whose result can vary
enormously.

However:
	- COMPOUND_SLACK_SPACE may be difficult to maintain as we add
	  more protocol.
	- BUG_ON or page faulting on failure seems overly fragile.
	- Especially in the 4.1 case, we prefer not to fail compounds
	  just because the returned result came *close* to session
	  limits.  (Though perfect enforcement here may be difficult.)
	- I'd prefer encoding to be uniform for all encoders instead of
	  having special exceptions for encoders containing, for
	  example, attributes.

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