Re: journaling file system

[Daniel Harvey <daniel@xxxxxxxxxxxxxxx>]

>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/


-
Linux-crypto:  cryptography in and on the Linux system
Archive:       http://mail.nl.linux.org/linux-crypto/