linux-ext4 - Tool to view extent metadata

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Message-ID: <23904f640907091517w10608fa4y9b3b8b3a631217c@mail.gmail.com>
Date:	Thu, 9 Jul 2009 15:17:00 -0700
From:	Manuel Benitez <rickyb@...gle.com>
To:	linux-ext4@...r.kernel.org
Subject: Tool to view extent metadata

I'm currently evaluating the ext4 allocator and one thing I've come
across is the lack of a tool that displays the exact structure of the
extents making up a file. I've found plenty of tools that will tell me
how many contiguous segments a file contains, but nothing so far to
let me see the actual makeup of the extents that map the inode to the
blocks that comprise the file. Have I just missed something obvious,
or would this be something worth me spending some time doing?

If so, one option would be to either modify the stat command or add a
similar command in debugfs to show the extents from the roots through
the root down to the leafs. Anyone have preferences or opinions?

Thanks,
-Ricky
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