linux-ext4 - Re: Type of filesystem block

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Message-ID: <20130324190055.GB26792@thunk.org>
Date:	Sun, 24 Mar 2013 15:00:55 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Subranshu Patel <spatel.ml@...il.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Type of filesystem block

On Sun, Mar 24, 2013 at 10:05:12PM +0530, Subranshu Patel wrote:
> But I don’t find any  debugfs command which can show similar block
> usage information about metadata blocks, whether it is a superblock,
> or inode bitmap block or block group descriptor, etc.
> Is there any way to extract the usage information of metadata blocks
> in ext4 filesystem ?

There isn't one today.  Normally I'll just look it up using the output
of dumpe2fs.

What's the use case where you need to get that information?  We could
add that as a new feature into debugfs, but it might be helpful to
understand the circumstances where you're needing that feature to
understand how best to add it into debugfs (or maybe some other
e2fsprogs command, such as e2fsck --- although in many cases e2fsck
has some of this already).

						- Ted
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