Mr. Daniel Harvey: Referencing your comments of 18 OCT 2004, I comment as follows: Based on your argument, is it presumable that using a journaling filesystem on a file backed loop device (even if you are not using loop-aes, or any encryption mechanism) can be quite a dangerous, correct? By the way at the bottom of your comments, you say "PS. Kernel 2.6", does that mean that the issue you speak of does not apply in Kernel 2.6 as it has been remediated in that kernel version? Very Respectfully, IT3 Stuart Blake Tener, USNR Beverly Hills, California NR SPAWAR 0886 NAF WASHINGTON, ANDREWS AFB, MD Email: teners@xxxxxxxxxxx NIPR : stuart.tener@xxxxxxxx CNRF : tenersb@xxxxxxxxxxxxxxxx ARMY : stuart.tener@xxxxxxxxxxx Amateur/HAM Radio Callsign: N3GWG west coast: (310)-358-0202 P.O. Box 16043, Beverly Hills, CA 90209-2043 east coast: (215)-338-6005 P.O. Box 45859, Philadelphia, PA 19149-5859 Telecopier: (419)-715-6073 fax to email gateway via www.efax.com JOIN THE US NAVY RESERVE, SERVE YOUR COUNTRY, AND BENEFIT FROM IT ALL. Tuesday, October 19, 2004 12:46 PM Subject: Re: journaling file system From: Daniel Harvey <daniel@xxxxxxxxxxxxxxx> Date: Mon, 18 Oct 2004 08:22:57 +0800 >From Jari's README for loop-aes: 2.2. Use of journaling file systems on loop device ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Don't use a journaling file system on top of file backed loop device. Device backed loop device can be used with journaling file systems as device backed loops guarantee that writes reach disk platters in order required by journaling file system (write caching must be disabled on the disk drive, of course). With file backed loop devices, correct write ordering may extend only to page cache (which resides in RAM) of underlying file system. VM can write such pages to disk in any order it wishes, and thus break write order expectation of journaling file system. Daniel. On Mon, 2004-10-18 at 03:56, majek04 wrote: > Hi. > > Is there any possibility of running journaling file system on the top > of crypted partition or file? It doesn't have to be loop-aes... > > Yours sincerely > majek04 > > PS. kernel 2.6 > > > - > Linux-crypto: cryptography in and on the Linux system > Archive: http://mail.nl.linux.org/linux-crypto/
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