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<a href="https://gitlab.com/simo5">Simo Sorce</a>
commented:
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<p dir="auto">I would add some more comments on the _sync function so a reader knows that
a) it is really only needed when we need to write back from an internal block that was needed because of a fragmented iovec not aligning on blocksized boundaries
b) that walking backwards is fine because we only ever sync a full block anyway.</p>
<p dir="auto">Other than that the latest revision of _sync() is quite fine once you understand the assumptions, and th code looks correct.</p>
<p dir="auto">I would also add a test vector that is more fragmented (with odd sized chunks) in the middle where a block is split over at least 3 different vectors, to make sure all corner cases are always tested in case of future modification.</p>
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