Re: O_DIRECT fails in some kernel and FS

[Ricardo Galli]

On 01/02/02 21:44, 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.

Does that mean that the succesful test with ext3 and 2.4.14 is bogus?

-- 
  ricardo
"I just stopped using Windows and now you tell me to use Mirrors?" 
    - said Aunt Tillie, just before downloading 2.5.3 kernel.