2014-01-27 Karel Zak <kzak@xxxxxxxxxx>: > On Sun, Jan 26, 2014 at 10:24:39AM +0100, Milan Broz wrote: >> On 01/26/2014 02:40 AM, Pali Rohár wrote: >> > Hello, >> > >> > according to wikipedia [1] and other sites (e.g. [2]) MBR partition ID >> > for LUKS is E8. I tried to find GPT partition GUID for LUKS, but there >> > is nothing on wikipedia [3] nor google... So has LUKS already > > Frankly, who cares about partition types? > > IMHO partition types make sense in firmwares like UEFI to detect boot > partition (e.g. GPT system partition) or in special cases when you > want to mark a partition for a special purpose (e.g. /home). > > It's bad idea to use partition types for something else, especially > add to the partition table info about partition format (e.g. E8 for > LUKS). Why? > It's nightmare to maintain something like this and I'm sure > that we don't want to maintain mkfs-like programs that modify > partition tables. > Of course, mkfs program should not modify partition table! Editing parittion table then it is up to system admin (if he using mkfs) or some high level partition program. >> > preferred/assigned GUID for GPT partition table? There is already GPT >> > GUID for linux data, raid, swap, lvm and home partitions (see [3]), so >> > I think that LUKS should have GUID too. > > All these are historical mistakes, I have doubts we want to contribute > to this nonsense. > > BTW, do you know what is the "official" list of the partition types > for MBR according to UEFI standard? It's Brouwer's (~aeb) web page [2]. > > IMHO it's pretty absurd situation when official standards have to link > random hobby web pages on Internet, because there is no official > authority that main such list... I think it obvious proof that > partition types for things like LIKS, swap, ... is unofficial junk. > In my opinion, if partition table (e.g GPT) support specifing partition label, uuid or partition type, why user/admin cannot use it (at least for his own usage)? I think its up to admin, if he want to use it or not. He can write own udev rules to export these information to system /dev/ or not. >> this is wonderful... who assigned E8 type? I thought LUKS has no assigned >> partition type and also I doubt LVM2 type is properly assigned too >> (it is probably form the LVM1 age when it was implemented in-kernel directly >> and partition type was important to detect it.) But not sure about this. >> >> Anyway, today partition type is ignored (both in LVM and LUKS), so it is really >> just for convenience for other applications. >> (Anyway, code should always use (lib)blkid to detect what's really on the device, >> not trust partition id.) >> >> For GPT GUID, I would like to know how these GUID codes appeared in libfdisk >> and how this was standardized for LVM. LUKS should have GUID too then... >> (cc to Karel as util-linux/libfdisk maintainer ;-) > > As Rod for gfdisk, wikipedia is the first source, and then random > requests from community. > >> > [2] - http://www.win.tue.nl/~aeb/partitions/partition_types-1.html > > Karel > > -- > Karel Zak <kzak@xxxxxxxxxx> > http://karelzak.blogspot.com -- Pali Rohár pali.rohar@xxxxxxxxx _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
