From: Theodore Tso <tytso@MIT.EDU>
To: Lee Davis <l.davis37@ymail.com>
Cc: "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
Subject: Re: EXT4 partition changes every time it's mounted. (How to stop this?)
Date: Sun, 22 May 2011 07:47:49 -0400 [thread overview]
Message-ID: <A129F9FD-E914-408C-8997-FD145AA2A697@mit.edu> (raw)
In-Reply-To: <476510.14310.qm@web125206.mail.ne1.yahoo.com>
On May 21, 2011, at 3:45 PM, Lee Davis wrote:
> I'm setting up a Linux system with full disk encryption. I've written a script (to run on every boot) which will verify that neither the MBR or /boot partition (ext4) has been modified.
>
> Problem is that every time I boot up the system, my /boot partition hashes differently.
>
> I'm guessing there is something behind the scenes which is changed/updated each time the filesystem is mounted? If so, can it be disabled?
Yes, there is a last mounted time in the superblock. If you mount the file system read-only, then not only will that field not be changed, but you can guarantee that nothing else will change...
-- Ted
next prev parent reply other threads:[~2011-05-22 11:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-21 19:45 EXT4 partition changes every time it's mounted. (How to stop this?) Lee Davis
2011-05-22 11:47 ` Theodore Tso [this message]
2011-05-23 4:39 ` Lee Davis
2011-05-26 6:15 ` Lee Davis
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