Hi all,
I have a couple of questions on the subject. I did some googling, and
found nothing at best, and conflicting results at worst.
1. Encrypting entire filesystems:
I remeber reading somewhere reiserfs official that you cannot use a
journaled filesystem over loopback block device that goes to a file.
During my digging today I found a rational that said that when the block
level calls are forwarded back to the filesystem that hosts the device,
they may be reordered. This can totally hose the journal.
Then I read again lots and lots and lots of people recommending doing
just that. Even more confusing, there is a post from someone official at
Ext3 saying that no reordering will take place, which is all they care
about.
Actually, it does make sense that if you perform an explicit flush, then
no reordering should take place. Then again, a conclusive answer would
be welcome.
Even more confusing - I remeber that the official Reiserfs related doc I
read said that there is an alternative way of doing the whole filesystem
encryption, but I cannot remember what it was. It may have something to
do with LVM, but I'm don't know how to ask LVM to encrypt.
2. Encrypting single files
It seems that ReiserFS 4 has been touted heavilly as having a plugin for
file level encryption. While I have found many references to this fact
(including in the official reiserfs page), I have not found any
instructions as to how to actually go around doing said encryption.
Again, any insight would be welcome.
Shachar
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