Hello,
I'm trying to create a systemd-homed based user, there is a problem with
--luks-offline-discard option. According to homectl(1), if this option
is true,
home directory loopback file is minified on logout. But in my case it's not
at all. Here is my executed command and output.
# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 1.1M 3.9G 1% /dev/shm
tmpfs 1.6G 9.5M 1.6G 1% /run
/dev/mapper/root 234G 118G 105G 53% /
tmpfs 3.9G 220K 3.9G 1% /tmp
/dev/sda1 191M 62M 130M 33% /boot
tmpfs 787M 60K 787M 1% /run/user/60448
# homectl create test --storage=luks --luks-offline-discard=yes
🔐 Please enter new password for user test: ****
🔐 Please enter new password for user test (repeat): ****
# homectl inspect test
User name: test
State: inactive
Disposition: regular
Last Change: Sat 2021-07-17 23:18:05 KST
Login OK: yes
Password OK: yes
UID: 60444
GID: 60444 (test)
Directory: /home/test
Storage: luks (strong encryption)
Image Path: /home/test.home
Removable: no
Shell: /bin/bash
LUKS Discard: online=no offline=yes
LUKS UUID: dd4ffd2f0e334280945af86f6d64906d
Part UUID: 64c13ffc40b74a8594bb10f6523d0548
FS UUID: 2d39d33d882e450dbab52c516b8bcbb5
File System: btrfs
LUKS Cipher: aes
Cipher Mode: xts-plain64
Volume Key: 256bit
Mount Flags: nosuid nodev exec
Disk Size: 88.5G
Disk Floor: 256.0M
Disk Ceiling: 104.2G
Auth. Limit: 30 attempts per 1min
Passwords: 1
Local Sig.: yes
Service: io.systemd.Home
# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 1.1M 3.9G 1% /dev/shm
tmpfs 1.6G 9.5M 1.6G 1% /run
/dev/mapper/root 234G 206G 16G 93% /
tmpfs 3.9G 220K 3.9G 1% /tmp
/dev/sda1 191M 62M 130M 33% /boot
tmpfs 787M 60K 787M 1% /run/user/60448
# homectl activate test
🔐 Please enter password for user test: ****
# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 1.1M 3.9G 1% /dev/shm
tmpfs 1.6G 9.5M 1.6G 1% /run
/dev/mapper/root 234G 206G 16G 93% /
tmpfs 3.9G 220K 3.9G 1% /tmp
/dev/sda1 191M 62M 130M 33% /boot
tmpfs 787M 60K 787M 1% /run/user/60448
/dev/mapper/home-test 89G 3.4M 89G 1% /home/test
# homectl deactivate test
# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 1.1M 3.9G 1% /dev/shm
tmpfs 1.6G 9.5M 1.6G 1% /run
/dev/mapper/root 234G 206G 16G 93% /
tmpfs 3.9G 220K 3.9G 1% /tmp
/dev/sda1 191M 62M 130M 33% /boot
tmpfs 787M 60K 787M 1% /run/user/60448
As you can see the home directory doesn't shrink even when deactivated
after activated. The systemd-homed debug log says, "File system does
not support FITRIM, not trimming.".
Note that my system's root directory is encrypted with LUKS2 and LVM
is not used. I'm not sure is this a bug of systemd or limitation of the
kernel.
Is there any way to solve this?
Thanks,
Gibeom Gwon
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