luks2 and discard/trim not working

Hello folks,

Recently, I upgraded to LUKS2 on a NVME SSD disk and noticed that fstrim
does not work. Surely it was running fine with LUKS1.

Here are some more details:

GNU/Gentoo Linux
kernel: 5.5.13-gentoo-x86_64
sys-fs/cryptsetup-2.2.2

NVME supports discard and fstrim on filesystem on nvme0n1p2(without
LUKS2 encyption) works fine:

NAME         DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO
nvme0n1             0      512B       2T         0
├─nvme0n1p1         0      512B       2T         0
├─nvme0n1p2         0      512B       2T         0
└─nvme0n1p3         0      512B       2T         0
  └─root_dif        0        0B       0B         0
    └─root          0        0B       0B         0

dmsetup table /dev/mapper/root | grep allow
0 947028136 crypt capi:rfc7539(chacha20,poly1305)-random
:32:logon:cryptsetup:6ae40ec7-1b4c-40ea-871b-d13c9ae66b92-d0 0 254:0 0
2 allow_discards integrity:28:aead

cryptsetup status root
/dev/mapper/root is active and is in use.
  type:    LUKS2
  cipher:  chacha20-random
  keysize: 256 bits
  key location: keyring
  integrity: poly1305
  device:  /dev/nvme0n1p3
  sector size:  512
  offset:  0 sectors
  size:    947028136 sectors
  mode:    read/write
  flags:   discards 

However:
fstrim -v /
fstrim: /: the discard operation is not supported

Any ideas?

Thanks,
-Nikolay
_______________________________________________
dm-crypt mailing list
[email protected]
https://www.saout.de/mailman/listinfo/dm-crypt