Re: [PATCH][RESEND] don't allow sys_readahead() on files opened with O_DIRECT

[Christoph Hellwig]

On Thu, Aug 25, 2005 at 01:24:40AM -0700, Andrew Morton wrote:
> > IMO sys_readahead() doesn't make sense if the file is opened with
> > O_DIRECT, because the page cache is stuffed but never used. Therefore
> > this patch changes that by letting the call return with -EINVAL.
> > 
> 
> a) It doesn't hurt, it's just a bit of a silly thing to do.

For ocfs that only allows either direct or buffered I/O on a single
inode at a given time it hurts.  It messes up the synchronization
protocol to be exact..

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