Re: [RFC][PATCH v3] readahead: introduce O_RANDOM forPOSIX_FADV_RANDOM

[Christoph Hellwig]

On Mon, Jan 04, 2010 at 04:17:19PM +1100, Stephen Rothwell wrote:
> > @@ -80,6 +80,10 @@
> >  #define O_NDELAY	O_NONBLOCK
> >  #endif
> >  
> > +#ifndef O_RANDOM
> > +#define O_RANDOM	010000000	/* random access pattern hint */
> > +#endif
> 
> This value conflicts with O_CLOEXEC on alpha and parisc and O_NOATIME on
> sparc.

Also when I tried to use this value for O_RSYNC and tested it I could
not actually see it getting propagated by the open code.

Eitherway I don't think an O_ value is a good idea for a simple access
pattern hint.

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