linux-ext4 - Re: [PATCH v2] jbd2: Limit number of reserved credits

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Date:	Tue, 4 Aug 2015 11:45:35 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Jan Kara <jack@...e.cz>
Cc:	Lukas Czerner <lczerner@...hat.com>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH v2] jbd2: Limit number of reserved credits

On Mon, Aug 03, 2015 at 12:54:34PM +0200, Jan Kara wrote:
> On Fri 31-07-15 17:11:34, Lukas Czerner wrote:
> > Currently there is no limitation on number of reserved credits we can
> > ask for. If we ask for more reserved credits than 1/2 of maximum
> > transaction size, or if total number of credits exceeds the maximum
> > transaction size per operation (which is currently only possible with
> > the former) we will spin forever in start_this_handle().
> > 
> > Fix this by adding this limitation at the start of start_this_handle().
> > 
> > This patch also removes the credit limitation 1/2 of maximum transaction
> > size, since we really only want to limit the number of reserved credits.
> > There is not much point to limit the credits if there is still space in
> > the journal.
> > 
> > This accidentally also fixes the online resize, where due to the
> > limitation of the journal credits we're unable to grow file systems with
> > 1k block size and size between 16M and 32M. It has been partially fixed
> > by 2c869b262a10ca99cb866d04087d75311587a30c, but not entirely.
> > 
> > Thanks Jan Kara for helping me getting the correct fix.
> > 
> > Signed-off-by: Lukas Czerner <lczerner@...hat.com>
> > ---
> > v2: added wait event Jan suggested
> 
> The patch looks good. You can add:
> 
> Reviewed-by: Jan Kara <jack@...e.cz>

Thanks, applied.

						- Ted
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