linux-ext4 - Re: [PATCH 1/3] jbd2 : Make jbd2 transaction handle allocation to return errors and handle them gracefully.

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Message-ID: <20110123054049.GC3237@thunk.org>
Date:	Sun, 23 Jan 2011 00:40:49 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Manish Katiyar <mkatiyar@...il.com>
Cc:	Jan Kara <jack@...e.cz>, ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 1/3] jbd2 : Make jbd2 transaction handle allocation to
 return errors and handle them gracefully.

On Sat, Jan 22, 2011 at 07:32:44PM -0800, Manish Katiyar wrote:
>  Hi Jan,
> 
> This is the follow up from https://lkml.org/lkml/2011/1/17/154
> Following patches make jbd2 to use GFP_KERNEL for transaction
> allocation if the caller can handle the errors. Following is the list
> of functions that I updated to pass the new flag. Also below is the
> list of functions which still have the old behavior and pass the old
> flags (either because they can't deal with errors, or I wasn't too
> sure so I did conservatively). Appreciate your feedback. The other
> callers of jbd2_journal_start() are from ocfs2, they still pass the
> old flag.

Hmm, I wonder if it would be better to use

jbd2_journal_start(...)

and

jbd2_journal_start_nofail(...)

The tradeoff is that long-term, the code is more readable (as opposed
to having people look up what a random "true" or "false" value means).
But short-term, while it will make the patch smaller, it also makes
the patch harder audit, since we need to look at all of the places
where we _haven't_ made a change to make sure those call sites can
tolerate an error return.

						- Ted
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