From: Eric Sandeen <sandeen@redhat.com>
To: Manuel Benitez <rickyb@google.com>
Cc: Andreas Dilger <adilger@sun.com>, linux-ext4@vger.kernel.org
Subject: Re: Tool to view extent metadata
Date: Mon, 13 Jul 2009 10:28:54 -0500 [thread overview]
Message-ID: <4A5B52B6.1060003@redhat.com> (raw)
In-Reply-To: <23904f640907130803w20089c79md6f6ceef54ff8f8e@mail.gmail.com>
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
next prev parent reply other threads:[~2009-07-13 15:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-09 22:17 Tool to view extent metadata Manuel Benitez
2009-07-09 22:55 ` Andreas Dilger
2009-07-13 15:03 ` Manuel Benitez
2009-07-13 15:28 ` Eric Sandeen [this message]
2009-07-13 19:27 ` Andreas Dilger
2009-07-10 5:19 ` Aneesh Kumar K.V
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