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    SubjectRe: O_DIRECT fails in some kernel and FS
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    On Fri, 2002-02-01 at 14:44, Andrew Morton wrote:
    > Ricardo Galli wrote:
    > >
    > > After some comments from Oliver Diedrich (editor of heise.de), which told me
    > > he couldn't make O_DIRECT work on 2.4.17, I tried with different versions and
    > > file systems:
    > >
    > > This is the result:
    > >
    > > 2.4.14 - Ext[23] - redhat7.2 glibs: OK (at least the bytes are written)
    > > 2.4.17 - ReiserFS - Debian Sid : FAILS (0 bytes file, write returns -1)
    > > 2.4.17 - Ext2 - Debian Woody : OK (bytes written)
    > > 2.4.17 - Ext3 - Debian Woody : FAILS (0 bytes file, write returns -1)
    > >
    > > Oliver Diedrich also told he could make work O_DIRECT with ext3 and 2.4.17.
    > >
    > > Is this normal? Does it really work on 2.4.14? Or it doesn't but the kernel
    > > doesn't avoid caching?
    > >
    >
    > ext2 is the only filesystem which has O_DIRECT support.

    And XFS ;-)

    Steve


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