Revert D30561459: Fix bytes_written and bytes_read
Test Plan: revert-hammer
Differential Revision:
D30561459 (https://github.com/pytorch/pytorch/commit/e98173ff3423247c597e21c923c8f47470ef07ab)
Original commit changeset: 976fa5167097
fbshipit-source-id: 43f4c234ca400820fe6db5b4f37a25e14dc4b0dd
