Check DIRECTIO flag when reading data

[wfarah]

An assumption (which might be true for most of the cases) is that BLOCSIZE is always a multiple of 512, and so the rawspec reader does not check for the DIRECTIO flag when reading data payload. With ATA data, the packet format is flexible and dynamic enough such that this alignment might not always be true.

TODO: add logic to seek to the next multiple of 512 when reading data in if DIRECTIO header flag exists and is enabled.

[dmkunsman]

@wfarah are you still working on this?...if not. I could try to implement it.

[texadactyl]

@wfarah @RocketRoss
Was this fixed in one of the ATA PRs?
rawspec_utils.c has some logic to this effect.

[radonnachie]

I haven't double checked the mechanisms around this. I feel like we would've noticed if something was off