[SOLVED] fstrim fails on LUKS-device

Hello,
today I've encountered a strange issue when installing Arch to my new SSD. I've read a lot about the options you have to set to enable TRIM and tried to configure my system according to these tutorials.
First of all the error:
# fstrim -v /home
fstrim: /home: FITRIM ioctl failed: Operation not supported.
These are my devices:
# blkid
/dev/sda1: UUID="d6e350c2-3b85-4cc8-8802-326f310912d9" TYPE="ext4"
/dev/sda2: UUID="8c3ea242-7b75-41d2-93f9-75b3c65aaa74" TYPE="crypto_LUKS"
/dev/mapper/home: UUID="a6419946-da6f-4ea7-9108-e882fb322fd4" TYPE="ext4"
"/dev/sda1" is the unencrypted root filesystem, "/dev/sda2" is the encrypted LUKS-device for /dev/mapper/home, which is mounted in /home.
I've added the mapped device to my /etc/fstab with the "discard" option:
/dev/sda1 / ext4 rw,discard,noatime 0 1
UUID=a6419946-da6f-4ea7-9108-e882fb322fd4 /home ext4 rw,discard,noatime 0 1
Then I configured this boot option line for GRUB to enable the discard option and updated the grub.cfg, of course:
linux /boot/vmlinuz-linux root=UUID=d6e350c2-3b85-4cc8-8802-326f310912d9 ro cryptdevice=/dev/sda2:home:allow-discards root_trim=yes quiet
Finally I enabled discard in /etc/crypttab:
home UUID=8c3ea242-7b75-41d2-93f9-75b3c65aaa74 none luks,discard
To realize these changes at the next reboot I also made a new initcpio with
# mkinitpcio -p linux
Having then rebooted I tried whether I was successful with
# dmsetup table /dev/mapper/home --showkeys
Some tutorials told me that there had to be "allow_discards" but there wasn't. I assume that I have forgotten something and TRIM doesn't work as a result.
Thank you in advance.
Last edited by daemoon (2013-08-11 12:02:01)

Not sure but you are trying to apply allow-discards to the physical partition (/dev/sda2) rather than the mapped device, right? Whereas the wiki does it the other way - at least the example at https://wiki.archlinux.org/index.php/LU … _.28SSD.29 suggests that.
Note that I have no idea if this matters.
I can tell you that the final figure on your fstab line for /home should be 2 rather than 1 but that is not the cause of your problem. Also, if you have the fsck hook in initramfs, you should change ro to rw on grub's kernel command line. If you don't have the hook, you should leave it as is.

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