linux-ext4 - Re: Bug in delayed allocation: really bad block layouts!

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Message-id: <20080818105012.GP3040@webber.adilger.int>
Date:	Mon, 18 Aug 2008 03:50:12 -0700
From:	Andreas Dilger <adilger@....com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Theodore Tso <tytso@....edu>, linux-ext4@...r.kernel.org,
	Kalpak Shah <Kalpak.Shah@....com>
Subject: Re: Bug in delayed allocation: really bad block layouts!

On Aug 11, 2008  00:36 -0500, Eric Sandeen wrote:
> Theodore Tso wrote:
> > One of
> > the things I've been meaning to do is to clean up the output of
> > filefrag so that it's a bit easier to parse.  It's really stupid for
> > it to print "file is in extents format" over and over again...
> 
> I'm not really even sure why it should print it at all, ever, at least
> without -vvv or something.  (That's what I meant to filter the first
> time ;)  If the tool is to report layout I'm not sure the trivia about
> how the layout is tracked internally is all that interesting.  The
> fiemap patches for filefrag that print it out more as a table format,
> more like xfs_bmap does, should be a lot better.  But anyway...

Actually, the FIEMAP patches for filefrag provide a much nicer format
for the output, more like what xfs_bmap does.  For now it only does
this if requested with the "-e" option (--extents) but if Ted is not
adverse to changing the output format of filefrag we could make it the
default.

The whole Lustre patchset (against 1.40.11) is at
http://downloads.lustre.org/public/tools/e2fsprogs/latest/e2fsprogs-1.40.11-sun1-patches.tar.gz

but Kalpak or I can send just the FIEMAP one again if you are interested.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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