[dm-crypt] libcryptsetup kernel feature detection fails on boot
gmazyland at gmail.com
Thu Jul 24 22:20:51 CEST 2014
On 07/23/2014 09:45 AM, Milan Broz wrote:
> On 23.7.2014 0:36, Thomas Bächler wrote:
>> Since cryptsetup 1.6.5, libcryptsetup fails to detect the kernel's
>> features on boot. In particular, whenever the dm-crypt module is not
>> loaded before configuring a mapping with libcryptsetup, the
>> allow_discards option is not used.
> Hm, yes, that's possible... dmcrypt is now needed only on activation
> (previaously it was loaded earlier perhaps).
> Well, the workaround for now is probably to always load dmcrypt module,
> I'll try to fix it soon.
It is fixed in devel git now. Thanks.
(The main problem with detection of features is that without device-mapper
target module loaded there is no way to get the version. And using only
kernel version is not enough, e.g. RHEL systems often backports features.)
More information about the dm-crypt