linux-ext4 - Newbie ext2 forensics question...

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Date:	Fri, 29 Sep 2006 04:47:38 +0000 (UTC)
From:	Dave Edwards <ext2@....lusars.net>
To:	linux-ext4@...r.kernel.org
Subject:  Newbie ext2 forensics question...

I'm trying to tune a linux system to spin down its (ext2-formatted) disk when
the system is idle. I've worked down to two problematic applications that
periodically spin up the disk, even though the (tiny) file they're writing is
(allegedly) on a tmpfs partition (/tmp/application/datafile, as it happens).
Enabling the vm debugging gets me output like:

kjournald(303): WRITE block 151824 on hda1
kjournald(303): WRITE block 151832 on hda1
kjournald(303): WRITE block 151840 on hda1
kjournald(303): WRITE block 151848 on hda1
kjournald(303): WRITE block 151856 on hda1
kjournald(303): WRITE block 151864 on hda1
pdflush(135): WRITE block 258211840 on hda1
pdflush(135): WRITE block 258211848 on hda1
pdflush(135): WRITE block 258211856 on hda1
pdflush(135): WRITE block 258310144 on hda1
pdflush(135): WRITE block 0 on hda1
pdflush(135): WRITE block 16 on hda1
pdflush(135): WRITE block 64 on hda1
pdflush(135): WRITE block 56098816 on hda1
pdflush(135): WRITE block 56100968 on hda1
pdflush(135): WRITE block 61079552 on hda1

(hda1 is an ext2-formatted partition, mounted noatime)

Is there any way to work back from block to inode to (hopefully) location in the
directory structure this is happening? For some reason, I don't get app and file
name (like I do with other programes), just some blocks that the disk got spun
up to write.

My appologies if there's a well-known tool for doing this; the furthest down
I've been able to dig is the inode level.

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