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From: Christoph Hellwig <hch@infradead.org>
To: Andrew Morton <akpm@osdl.org>
Cc: Jan Blunck <j.blunck@tu-harburg.de>,
	torvalds@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH][RESEND] don't allow sys_readahead() on files opened with O_DIRECT
Date: Thu, 25 Aug 2005 13:46:41 +0100	[thread overview]
Message-ID: <20050825124641.GA13502@infradead.org> (raw)
In-Reply-To: <20050825012440.66b61cca.akpm@osdl.org>

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..


      parent reply	other threads:[~2005-08-25 12:46 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-08-19 12:44 [PATCH][RESEND] don't allow sys_readahead() on files opened with O_DIRECT Jan Blunck
2005-08-25  8:24 ` Andrew Morton
2005-08-25 12:13   ` Jan Blunck
2005-08-25 12:46   ` Christoph Hellwig [this message]

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