linux-ext4 - Re: Tool to view extent metadata

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Message-ID: <4A5B52B6.1060003@redhat.com>
Date:	Mon, 13 Jul 2009 10:28:54 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Manuel Benitez <rickyb@...gle.com>
CC:	Andreas Dilger <adilger@....com>, linux-ext4@...r.kernel.org
Subject: Re: Tool to view extent metadata

Manuel Benitez wrote:
> Andreas,
> 
> Thank you for the reply. I wrote a program that uses FIEMAP to see
> what I could get from it. It gives the same information that you can
> extract from FIBMAP except that it is much more efficient (one ioctl
> call per extent rather than one call per block). Unfortunately, it
> does not give much insight into the structure of the metadata, so
> there is no way to tell how efficiently the metadata represents the
> file (depth of extent tree, number of internal and leaf nodes, etc.).

adding something to debugfs should not be hard either; look at how it
prints out the BLOCKS: when you stat a file, for extent-format files
it'd be nice to have a better representation.  If you wanted to write a
patch for this it'd be great.  :)

-Eric
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