linux-kernel - Re: [PATCH] hostfs: Use noop

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Date:	Wed, 14 Jan 2015 00:39:51 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Richard Weinberger <richard@....at>
Cc:	Christoph Hellwig <hch@...radead.org>,
	user-mode-linux-devel@...ts.sourceforge.net, dxld@...kboxed.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] hostfs: Use noop_fsync for directories

On Tue, Jan 13, 2015 at 11:26:38PM +0100, Richard Weinberger wrote:
> hostfs tries do reduce the amount of syscall between guest and host as much
> as possible. For file operations it passes everything down to the host but
> for directory operations only ->iterate() does.
> 
> It is already horrible slow, if we add an ->open() for directory too it would
> get even more slower. :-(

This sounds fairlt dangerous.  At least add some good documentation
explaining these semantics.

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