linux-kernel - Re: [PATCH, RFC] ext4: Replace hackish ext4_mb_poll_new

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Date:	Fri, 17 Oct 2008 11:34:25 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH, RFC] ext4: Replace hackish
	ext4_mb_poll_new_transaction with commit callback

On Thu, Oct 16, 2008 at 08:02:43PM -0400, Theodore Ts'o wrote:
> The multiblock allocator needs to be able to release blocks (and issue
> a blkdev discard request) when the transaction which freed those
> blocks is committed.  Previously this was done via a polling mechanism
> when blocks are allocated or freed.  A much better way of doing things
> is to create a jbd2 callback function and attaching the list of blocks
> to be freed directly to the transaction structure.


Why not use journal commit callback patch from andreas 
(MID:20080929201752.GN10950@...ber.adilger.int
http://article.gmane.org/gmane.comp.file-systems.ext4/9148)

The patch you sent will allows only one call back to be registered.

-aneesh
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