linux-kernel - Re: plain 2.6.21-rc5 (1) vs amanda (0)

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Message-Id: <1175488272.3161.28.camel@obelisk.thedillows.org>
Date:	Mon, 02 Apr 2007 00:31:12 -0400
From:	Dave Dillow <dave@...dillows.org>
To:	Gene Heskett <gene.heskett@...il.com>
Cc:	linux-kernel@...r.kernel.org, ray-gmail@...rabbit.org,
	Ingo Molnar <mingo@...e.hu>, amanda-hackers@...nda.org,
	amanda-users@...nda.org
Subject: Re: plain 2.6.21-rc5 (1) vs amanda (0)

On Mon, 2007-04-02 at 00:20 -0400, Gene Heskett wrote:
> >From another email I sent Dave an hour or so ago:
> 
> For a good kernel, 2.6.20.3-rdsl-0.31:
> [root@...ote bad-kernel]# cd /usr/music
> [root@...ote music]# stat .
>   File: `.'
>   Size: 4096            Blocks: 16         IO Block: 4096   directory
> Device: fd00h/64768d    Inode: 10354963    Links: 39
> Access: (0755/drwxr-xr-x)  Uid: (    0/    root)   Gid: (    0/    root)
> Access: 2007-04-01 21:07:14.000000000 -0400
> Modify: 2006-11-12 06:41:00.000000000 -0500
> Change: 2007-01-19 13:15:22.000000000 -0500
> [root@...ote music]#                                                               
> 
> Now rebooted to 2.6.21-rc5:
> [root@...ote ~]# cd /usr/music
> [root@...ote music]# stat .
>   File: `.'
>   Size: 4096            Blocks: 16         IO Block: 4096   directory
> Device: ee00h/60928d    Inode: 10354963    Links: 39
> Access: (0755/drwxr-xr-x)  Uid: (    0/    root)   Gid: (    0/    root)
> Access: 2007-04-01 21:07:14.000000000 -0400
> Modify: 2006-11-12 06:41:00.000000000 -0500
> Change: 2007-01-19 13:15:22.000000000 -0500
> 
> What is this difference in the Device: line supposed to mean?
> 
> And are we 'getting warmer' here?

For those playing along at home, I believe the issue is that GNU tar
sees a different device number for the directories than what is listed
in the listed-incremental snapshot file, and thinks all of the
directories are new. I've asked Gene to make a few back-to-back runs of
the tar command under the same kernel to see if the subsequent runs
figure out that there's nothing to do, as expected.

Then it is a matter of figuring out why the device number changed -- I'm
thinking it is device-mapper, but will look closer tomorrow.
Dave
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