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SubjectRe: O_DIRECT
On Tue, 20 Jul 2004 20:48:24 +0200
bert hubert <ahu@ds9a.nl> wrote:

Hi Bert,

> On Tue, Jul 20, 2004 at 10:27:57AM -0700, Shesha Sreenivasamurthy wrote:
> > I am having trouble with O_DIRECT. Trying to read or write from a block
> > device partition.
> >
> > 1. Can O_DIRECT be used on a plain block device partition say
> > "/dev/sda11" without having a filesystem on it.
>
> As fas as I know, yes, but be aware that O_DIRECT requires page aligned
> addresses! (an integral of 4096 on most systems).

"soft block size" aligned. The soft block size can be smaller than
a page (but not bigger). There's a requirement for:

- r/w offset
- r/w size

greetings,
Rob van Nieuwkerk
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