From: Nikita Danilov <nikita@clusterfs.com>
Date: Wed, 9 Aug 2006 17:53:47 +0000 (-0400)
Subject: NFS: Fix a potential deadlock in nfs_release_page
X-Git-Tag: v2.6.18-rc5~58^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ddeff520f02b92128132c282c350fa72afffb84a;p=pandora-kernel.git

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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