From: Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
To: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Cc: mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
mtk.manpages-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org,
linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: sync_file_range.2: add some big WARNINGS
Date: Tue, 22 Sep 2009 11:47:37 -0700 [thread overview]
Message-ID: <20090922114737.abbe3b19.akpm@linux-foundation.org> (raw)
In-Reply-To: <20090922114052.GA1521-jcswGhMUV9g@public.gmane.org>
On Tue, 22 Sep 2009 13:40:52 +0200 Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org> wrote:
> On Mon, Sep 21, 2009 at 01:15:19PM -0700, Andrew Morton wrote:
> > The syscall is all about dirty memory management and userspace control
> > over IO timing/volume. Trying to use it for data integrity purposes is a
> > bit perverse.
>
> Yes, its is. But that needs to be clearly documented. If you have
> better wording to make it crystal clear you're welcome.
>
> Additionally I have a half-backed patch to allow it calling into ->fsync
> to actually make it usable as a fdatasync_range/fsync_range, but I
> wonder if we should just add those as syscalls instead.
hm, hard call.
I guess we should avoid permitting people to sync the metadata before
the data, because that would provide an easy way to expose huge amounts
of unwritten blocks if the machine crashes at the right time. Or
perhaps it's not worth bothering about that.
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next prev parent reply other threads:[~2009-09-22 18:47 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-27 18:01 sync_file_range.2: add some big WARNINGS Christoph Hellwig
[not found] ` <20090827180116.GB31605-jcswGhMUV9g@public.gmane.org>
2009-09-20 5:34 ` Michael Kerrisk
[not found] ` <cfd18e0f0909192234l57ad4ec0rda34dcb83e355c5e-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-09-21 20:15 ` Andrew Morton
[not found] ` <20090921131519.875b4608.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2009-09-22 11:40 ` Christoph Hellwig
[not found] ` <20090922114052.GA1521-jcswGhMUV9g@public.gmane.org>
2009-09-22 18:47 ` Andrew Morton [this message]
2009-09-30 15:47 ` Christoph Hellwig
2009-12-04 15:25 ` Christoph Hellwig
2010-01-09 14:49 ` Christoph Hellwig
[not found] ` <20100109144910.GA30167-jcswGhMUV9g@public.gmane.org>
2010-01-17 5:48 ` Michael Kerrisk
[not found] ` <cfd18e0f1001162148w78c3ebe8u9d54fdeb7dac8892-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-01-17 9:58 ` Christoph Hellwig
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