um: hostfs: Fix writeback
We have to implement ->release() and trigger writeback from it.
Otherwise we might lose dirty pages at munmap().
Signed-off-by: 
Richard Weinberger <richard@nod.at>
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We have to implement ->release() and trigger writeback from it.
Otherwise we might lose dirty pages at munmap().
Signed-off-by: Richard Weinberger <richard@nod.at>