linux-ext4 - Re: delalloc fragmenting files?

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Date:	Mon, 05 Nov 2007 12:54:34 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	Eric Sandeen <sandeen@...hat.com>,
	Alex Tomas <bzzz.tomas@...il.com>,
	ext4 development <linux-ext4@...r.kernel.org>,
	Kalpak Shah <Kalpak.Shah@....COM>
Subject: Re: delalloc fragmenting files?

Andreas Dilger wrote:

> On a related note - the FIEMAP patches to filefrag also include a new
> output format that is much more useful, IMHO.  The new format is like:
> 
> {filename}
> ext: [logical start.. end kB]: phys start..end kB    :           kB:lun: flags
>   0: [         0..     30207]:     401416..    522251:       120828: 0 :
>   1: [     30208..     60927]:     532480..    655359:       122880: 0 :
>   2: [     60928..    121855]:     790536..    916484:       125948: 0 :
> 
> Hopefully Kalpak will be able to post the updated patches here soon.

yep, I hacked existing filefrag to do something like this, the existing
format is pretty hard to glance over :)

One thing I like about xfs_bmap is that it can tell you which Allocation
Group the blocks are in; most filesystems have some concept of
sub-regions of the filesystem, such as BGs or resource groups or whatnot
- do you think there is room for this in the FIEMAP interface?  Hm, or
should this just be calculated from knowing the size of the sub-regions...

-Eric
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