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SubjectRe: Latest AIO patchset
On Wed, 25 Feb 2004, Benjamin LaHaise wrote:

> On Wed, Feb 25, 2004 at 08:45:29PM +0200, Hayim Shaul wrote:
> > What exactly is the O_DIRECT flag? When I add this flag to the open func
> > it fails.
> >
> > More specificaly, this function fails
> > open("filename", O_RDWR | O_DIRECT | O_LARGEFILE | O_CREAT, S_IRWXU);
> >
> > but this one succeeds
> > open("filename", O_RDWR | O_LARGEFILE | O_CREAT, S_IRWXU);
> >
> > I'm running linux 2.6.0 with libaio 0.3.92.
>
> Which filesystem? Not all support O_DIRECT.
>

ext3
I'm think it does support ext3.

Actually, I was wrong. open does succeed. It return a valid fd
but after writing and exiting, the file is still zero size.

removing the O_DIRECT with the same prog writes quite alot to the file.

Hayim.

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