From ddeff520f02b92128132c282c350fa72afffb84a Mon Sep 17 00:00:00 2001
From: Nikita Danilov <nikita@clusterfs.com>
Date: Wed, 9 Aug 2006 13:53:47 -0400
Subject: [PATCH] NFS: Fix a potential deadlock in nfs_release_page

nfs_wb_page() waits on request completion and, as a result, is not safe to be
called from nfs_release_page() invoked by VM scanner as part of GFP_NOFS
allocation. Fix possible deadlock by analyzing gfp mask and refusing to
release page if __GFP_FS is not set.

Signed-off-by: Nikita Danilov <danilov@gmail.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
(cherry picked from 374d969debfb290bafcb41d28918dc6f7e43ce31 commit)
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