On 26/02/2024 at 01:14, Matthew Wilcox wrote:

- create a logical volume in the free VG space
- blkdiscard the logical volume

Last time I checked, dm-crypt did not pass DISCARD requests through to
the underlying device because it's a security hazard.

AFAICS dm-crypt and cryptsetup have supported discard since Linux 3.1.

crypttab(5) states that "starting with Debian 10 (Buster), this option is added per default to new dm-crypt devices by the Debian Installer".

Discard can still be disabled at the filesystem or swap level, or you can disable dm-crypt discard after running blkdiscard.

Reply via email to