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08d20f1646
Currently, in order to back the EFS storage with a regular file, those files have to be pre-allocated, and with their correct size. This is especially problematic when preparing a minimal FSG, since we do not know ahead of time what size to pre-allocate. Allow reads that go beyond the end of the backing storage to simply read zeroes. When a write comes in, the file will be automatically expanded to the correct size. (And should really only be written if a full sector was pulled out of the modem). For solutions that use partitions instead of files, this change should be a no-op.