Milan Broz wrote:
it seems that someone optimize the request, direct io does what you want. in fact, dm receives bio requesting 1024 bytes, not 512. (optimizing it to page size, but here it is limited by device size). assuming that your arch has 4kb pages, try to setup device with 0 8 zero 8 8 error
Ahh, of course! The buffer cache is trying to read a whole page. And I guess it just gives up and fails the entire request rather than retrying only on the requested area.
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