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
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