On Fri, 2005-07-15 at 17:56 +0100, Joel Becker wrote:
> On Thu, Jul 14, 2005 at 10:18:28PM -0700, Badari Pulavarty wrote:
> > I can imagine a reason for relaxing the alignment. I keep getting asked
> > whether we can do "O_DIRECT mount option". Database folks wants to
> > make sure all the access to files in a given filesystem are O_DIRECT
>
> All currently existing "O_DIRECT mount option" implementations
> that I know of do:
>
> if (not-512-aligned)
> bounce_buffer()
>
> That is, no one attempts to support the wacky variations in DMA engines.
I believe some OSs do buffered IO, if there is a problem with alignment.
Thanks,
Badari
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