linux-ext4 - Re: [PATCH] ext4: Add support for data=alloc_on

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Message-ID: <20090317092859.GA30636@skywalker>
Date:	Tue, 17 Mar 2009 14:58:59 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext4: Add support for data=alloc_on_commit mode

On Mon, Mar 16, 2009 at 11:19:58PM -0400, Theodore Ts'o wrote:
> Add an ext3 bug-for-bug compatible analogue for data=ordered mode.  In
> this mode, we force all delayed allocation blocks involved with the
> to-be-commited transaction to be allocated, and then flushed out to
> disk before the transaction is commited.
> 

Wouldn't this cause a deadlock ? We want to commit a transaction because
we don't have enough journal space (via journal_start) and now that would cause block
allocation which would do another journal_start()

-aneesh
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