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: <20110204155358.GF4104@quack.suse.cz>
Date:	Fri, 4 Feb 2011 16:53:58 +0100
From:	Jan Kara <jack@...e.cz>
To:	Manish Katiyar <mkatiyar@...il.com>
Cc:	Jan Kara <jack@...e.cz>, Andreas Dilger <adilger.kernel@...ger.ca>,
	Joel Becker <jlbec@...lplan.org>, Ted Ts'o <tytso@....edu>,
	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 29-01-11 21:40:03, Manish Katiyar wrote:
  Hi Manish,

> Have we reached on any conclusion yet on the function name which I can
> use to send my updated patch ? My preference from the above list is to
> use ext4_journal_start_nofs() as that seems the closest match, but I
> would like hear the conclusion from experts.
  How about "ext4_journal_start_tryhard()"? I don't like "nofs" because
the fact whether we use GFP_NOFS is separate from the fact whether we are
able to handle memory allocation failure.

In fact, your patch set should keep calling kzalloc() with GFP_NOFS in all
cases to avoid new recursions into the filesystem (which could cause
deadlocks - changing that would need a separate audit if we care enough).
Just the retrying logic should be influenced by your work.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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