linux-ext4 - Re: [PATCH 10/35] undo-io: add new calls to and speed up the undo io manager

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Message-ID: <20150422024744.GG11592@birch.djwong.org>
Date:	Tue, 21 Apr 2015 19:47:44 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	Andreas Dilger <adilger@...ger.ca>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 10/35] undo-io: add new calls to and speed up the undo io
 manager

On Tue, Apr 21, 2015 at 12:48:02PM -0400, Theodore Ts'o wrote:
> On Tue, Apr 21, 2015 at 11:00:12AM -0400, Theodore Ts'o wrote:
> > However, if the user types ^C, or e2fsck crashes out with a call to
> > fatal_error(), we *should* make sure the undo log is in a proper state
> > so it can be replied.
> 
> It looks like the current set of patches are registering an atexit()
> cleanup handler, but there aren't changes to add signal handlers; is
> this correct?
> 
> In the case of e2fsck, we have signal handlers already, but many of
> the other e2fsprogs programs don't have signal handlers and unless I
> missed them when I did a quick scan, it looks like this patch series
> doesn't add any.

Correct, it does not.  I hadn't made up my mind if I wanted to continue writing
stuff out if one of the bad signals comes in, but for the specific case of ^C
it does seem warranted.  I'm also not quite sure when's a good time to install
our own "default" handler ... I guess each undo io manager could install
itself via sigaction and store the old pointer for calling later?

WAL could be useful too, but I wouldn't want undo_io and wal_io banging around
inside libext2fs together.

--D

> 
> 					- Ted
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