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    SubjectRe: [PATCH] 2.4.x write barriers (updated for ext3)

    On Sun, Mar 10, 2002 at 12:24:12AM -0500, Douglas Gilbert wrote:

    > > FUA is not available on WRITE6, only WRITE10 or WRITE12 commands.
    > Stephen,
    > FUA is also available on WRITE16.

    I said WRITE6, not WRITE16. :-) WRITE6 uses the low 5 bits of the LUN
    byte for the top bits of the block number; WRITE10 and later use those
    5 bits for DPO/FUA etc. But WRITE6 is a horribly limited interface:
    you only have 21 bits of block number for a start, so it's limited to
    1GB on 512-byte-sector devices. We can probably ignore WRITE6 safely

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