linux-ext4 - Re: Query regarding ext4 filesystem

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Message-id: <1805.1290699473@gamaville.dokosmarshall.org>
Date:	Thu, 25 Nov 2010 10:37:53 -0500
From:	Nick Dokos <nicholas.dokos@...com>
To:	Nivedita J N <niveditajn@...aelxsi.co.in>
Cc:	linux-ext4@...r.kernel.org, nicholas.dokos@...com
Subject: Re: Query regarding ext4 filesystem

>    I'm planning to use ext4 filesystem in my ubuntu machine.I am doing
> a detailed search on the filesystem.I would like to know where the
> journal is stored in ext4 file system? Is it visible?
> 

You can use debugfs for this - do ``man 8 debugfs'' for more info. The
journal is generally inode 8 (you can do

    dumpe2fs -h /dev/FOO | grep "Journal inode:"

to make sure), so in debugfs you can do

    stat <8>
    ex <8>

to get metadata (size, perms, etc.) and extent information and

    logdump <OPTIONS>

to examine the contents of the journal - see the debugfs man page
for <OPTIONS> info.

HTH,
Nick
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