NFS: Prevent another deadlock in nfs_release_page()

We should not attempt to free the page if __GFP_FS is not set. Otherwise we
can deadlock as per

  http://bugzilla.kernel.org/show_bug.cgi?id=15578



Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@kernel.org

parent fc7f99cf

fs/nfs/file.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -491,7 +491,8 @@ static int nfs_release_page(struct page *page, gfp_t gfp)
		{
		dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);

		if (gfp & __GFP_WAIT)
		/* Only do I/O if gfp is a superset of GFP_KERNEL */
		if ((gfp & GFP_KERNEL) == GFP_KERNEL)
		nfs_wb_page(page->mapping->host, page);
		/* If PagePrivate() is set, then the page is not freeable */
		if (PagePrivate(page))