Re: [rfc patch 2/2] direct-io: remove address alignment check

[Badari Pulavarty]

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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