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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150114083951.GA29714@infradead.org>
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.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/