nommu: allow private mappings of read-only devices
Slightly rearrange the logic that determines capabilities and vm_flags. Disable BDI_CAP_MAP_DIRECT in all cases if the device can't support the protections. Allow private readonly mappings of readonly backing devices. Signed-off-by: NBernd Schmidt <bernds_cb1@t-online.de> Signed-off-by: NMike Frysinger <vapier@gentoo.org> Acked-by: NDavid McCullough <davidm@snapgear.com> Acked-by: NGreg Ungerer <gerg@uclinux.org> Acked-by: NPaul Mundt <lethal@linux-sh.org> Acked-by: NDavid Howells <dhowells@redhat.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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