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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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