On Wed, Feb 10, 2010 at 12:43:55PM -0500, M Thomas Frederiksen wrote: > On Wed, Feb 10, 2010 at 12:14, Arno Wagner <arno@xxxxxxxxxxx> wrote: > > > On Wed, Feb 10, 2010 at 12:00:39PM -0500, M Thomas Frederiksen wrote: > > > > There is no "drive unlocking", what happens is that a new > > device is created which just happens to contain a decrypted > > version of the encrypted one. They are not associated in any > > way (except by an LVM mapping that is typically not understood > > by applications). > > > > > > So either there is a corresponding device in /dev/mapper or > > not, btrfs does not care where the device comes from. And > > if you have not done the cryptsetup, then there is no device > > in /dev/mapper and btrfs cannot use a non-existent device. > > > > The point is that once the other volumes are added, btrfs will need three > devices in /dev/mapper: > > 1. /dev/mapper/sda3_crypt > 2. /dev/mapper/sdb2_crypt > 3. /dev/mapper/sdc2_crypt > > However, during the boot process, /dev/mapper/sda3_crypt is the only device > being created. If I do a blkid, I get: > > /dev/mapper/sda3_crypt: UUID="e0948aa0-efab-4449-938d-6d74b6ccbf93" > UUID_SUB="b3b1e4cc-ca0e-44ba-be35-32405b20025b" TYPE="btrfs" > > So would I change the fstab from: > > /dev/mapper/sda3_crypt / btrfs error=remount-ro,compress 0 1 > > to: > > UUID_SUB=b3b1e4cc-ca0e-44ba-be35-32405b20025b / btrfs > error=remount-ro,compress 0 1 Why would you, is /dev/mapper/sda3_not fine? > ? Would that be the same UUID_SUB for other /dev/mapper/sdX_crypts? I don't think so. > And > would grub / boot scripts be smart enough to figure out that it needs all > three device files? Grub is not involved. What your boot script does, I have no idea. You may want to look at /etc/crypttab, that could give you the option to mount all three with the same passphrase. I have only used it to set up encrypted sawp, no idea what it can do in addition (man crypttab for a description). Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@xxxxxxxxxxx GnuPG: ID: 1E25338F FP: 0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans If it's in the news, don't worry about it. The very definition of "news" is "something that hardly ever happens." -- Bruce Schneier _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
