Re: [PATCH V2] Btrfs: Full direct I/O and AIO read implementation.

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On Mon, Feb 15, 2010 at 11:42:55AM -0500, Chris Mason wrote:
> We can record the smallest alignment while scanning the devices and just
> use that.  In general 4K is good enough, although some other database
> company might be more worried about smaller numbers.

How is access at 512 byte granularity supposed to work?  With 4k logical
sector drives that will require a manual read-modify write cycle in
the direct I/O code, which is counter the intentions.

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