From: J. Bruce Fields <bfields@redhat.com>
Date: Mon, 20 Sep 2010 02:55:06 +0000 (-0400)
Subject: nfsd4: fix hang on fast-booting nfs servers
X-Git-Tag: v2.6.37-rc1~113^2~92
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=06497524589f2a7717da33969d541674e0a27da6;p=pandora-kernel.git

nfsd4: fix hang on fast-booting nfs servers

The last_close field of a cache_detail is initialized to zero, so the
condition

	detail->last_close < seconds_since_boot() - 30

may be false even for a cache that was never opened.

However, we want to immediately fail upcalls to caches that were never
opened: in the case of the auth_unix_gid cache, especially, which may
never be opened by mountd (if the --manage-gids option is not set), we
want to fail the upcall immediately.  Otherwise client requests will be
dropped unnecessarily on reboot.

Also document these conditions.

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