linux-ext4 - Re: Metadata reservation for unwritten extent conversion

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Message-ID: <alpine.LFD.2.00.1303131830570.18319@dhcp-1-104.brq.redhat.com>
Date:	Wed, 13 Mar 2013 18:31:25 +0100 (CET)
From:	Lukáš Czerner <lczerner@...hat.com>
To:	"Theodore Ts'o" <tytso@....edu>
cc:	Lukáš Czerner <lczerner@...hat.com>,
	linux-ext4@...r.kernel.org
Subject: Re: Metadata reservation for unwritten extent conversion

On Wed, 13 Mar 2013, Theodore Ts'o wrote:

> Date: Wed, 13 Mar 2013 13:25:21 -0400
> From: Theodore Ts'o <tytso@....edu>
> To: Lukáš Czerner <lczerner@...hat.com>
> Cc: linux-ext4@...r.kernel.org
> Subject: Re: Metadata reservation for unwritten extent conversion
> 
> On Wed, Mar 13, 2013 at 05:09:51PM +0100, Lukáš Czerner wrote:
> > 
> > Well, we can not actually revert that patch because it introduces
> > da_reserve_metadata() which is used elsewhere in the commit:
> > 
> > ext4: reserve metadata block for every delayed write
> > 
> > I can resend the patch which uses da_reserve_metadata() so you can use
> > it instead the old version
> 
> That sounds like the best thing to do.  I assume you will be simply
> taking the da_reserve_metadata() function introduced in the
> to-be-dropped commit:
> 
> > ext4: Reserve metadata if writing into uninitialized
> 
> ... and moving it into the "reserve metadata block for every delayed
> write" patch?

Exactly.

-Lukas

> 
> 					- Ted