linux-kernel - Re: [PATCH 04/27] kill filp

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Message-ID: <478E3B00.1030503@redhat.com>
Date:	Wed, 16 Jan 2008 17:12:32 +0000
From:	"Bryn M. Reeves" <breeves@...hat.com>
To:	Dave Hansen <haveblue@...ibm.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, miklos@...redi.hu, hch@...radead.org,
	Alasdair G Kergon <agk@...hat.com>
Subject: Re: [PATCH 04/27] kill filp_open()

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Dave Hansen wrote:
> On Wed, 2008-01-16 at 00:52 -0800, Andrew Morton wrote:
>> On Thu, 01 Nov 2007 16:08:31 -0700 Dave Hansen <haveblue@...ibm.com> wrote:
>>> Replace all callers with open_namei() directly, and move the
>>> nameidata stack allocation into open_namei().
>> ftp://ftp.kernel.org/pub/linux/kernel/people/agk/patches/2.6/editing/dm-loop.patch
>> is using filp_open() and hence doesn't work very well.
>>
>> A shall revert dm-loop.patch and run away.
> 
> This one's pretty easy, thank goodness.  Just replace filp_open() with
> open_namei():
> 
> 	/filp_open(/open_namei(AT_FDCWD, /
> 
> BTW, why do we need this on top of the existing loopback driver?  Can
> they really share no code?

The current dm-loop patch was really written to demonstrate the value of
block-mapping as an alternative to doing file backed I/O via the pagecache.

Personally, I would like to see a single "loopback block devices" driver
in the kernel with loop.c and dm-loop as alternate interfaces to it.

There seems to be some demand for this, e.g.:

http://bugzilla.kernel.org/show_bug.cgi?id=5333

And numerous similar posts to dm-devel (although I think obsoleting may
be going a bit far to start with!).

Regards,
Bryn.
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