From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Tue, 27 Apr 2010 22:33:54 +0000 (-0400)
Subject: NFS: Ensure that nfs_wb_page() waits for Pg_writeback to clear
X-Git-Tag: v2.6.34-rc6~6^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ba8b06e67ed7a560b0e7c80091bcadda4f4727a5;p=pandora-kernel.git

NFS: Ensure that nfs_wb_page() waits for Pg_writeback to clear

Neil Brown reports that he is seeing the BUG_ON(ret == 0) trigger in
nfs_page_async_flush. According to the trace in
     https://bugzilla.novell.com/show_bug.cgi?id=599628
the problem appears to be due to nfs_wb_page() not waiting for the
PG_writeback flag to clear.

There is a ditto problem in nfs_wb_page_cancel()

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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