linux-ext4 - Re: [PATCH 09/26] jbd2: Transaction reservation support

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Message-ID: <20130604163642.GJ25160@thunk.org>
Date:	Tue, 4 Jun 2013 12:36:42 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 09/26] jbd2: Transaction reservation support

On Fri, May 31, 2013 at 11:42:42AM +0200, Jan Kara wrote:
> In some cases we cannot start a transaction because of locking constraints and
> passing started transaction into those places is not handy either because we
> could block transaction commit for too long. Transaction reservation is
> designed to solve these issues. It reserves a handle with given number of
> credits in the journal and the handle can be later attached to the running
> transaction without blocking on commit or checkpointing. Reserved handles do
> not block transaction commit in any way, they only reduce maximum size of the
> running transaction (because we have to always be prepared to accomodate
> request for attaching reserved handle).
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

Thanks, applied.

						- Ted
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