From: Ted Ts'o Subject: Re: [PATCH 1/3] jbd2 : Make jbd2 transaction handle allocation to return errors and handle them gracefully. Date: Sun, 23 Jan 2011 00:40:49 -0500 Message-ID: <20110123054049.GC3237@thunk.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Jan Kara , ext4 To: Manish Katiyar Return-path: Received: from THUNK.ORG ([69.25.196.29]:46696 "EHLO thunker.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750802Ab1AWFky (ORCPT ); Sun, 23 Jan 2011 00:40:54 -0500 Content-Disposition: inline In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: 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