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Enable SSD TRIM for LUKS-encrypted drives #5332

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528f1af
Enable SSD TRIM for LUKS-encrypted drives
stephentaylor-com Apr 17, 2026
9822347
Address Copilot review feedback
stephentaylor-com Apr 17, 2026
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5 changes: 5 additions & 0 deletions install/login/limine-snapper.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,11 @@ EOF

CMDLINE=$(grep "^[[:space:]]*cmdline:" "$limine_config" | head -1 | sed 's/^[[:space:]]*cmdline:[[:space:]]*//')

# Enable SSD TRIM passthrough for LUKS-encrypted drives
if [[ $CMDLINE == *"cryptdevice="* ]] && [[ $CMDLINE != *"allow-discards"* ]]; then
CMDLINE=$(printf '%s\n' "$CMDLINE" | sed 's/\(cryptdevice=[^ "]*\)/\1:allow-discards/')
fi

sudo cp $OMARCHY_PATH/default/limine/default.conf /etc/default/limine
sudo sed -i "s|@@CMDLINE@@|$CMDLINE|g" /etc/default/limine

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28 changes: 28 additions & 0 deletions migrations/1776500000.sh
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@@ -0,0 +1,28 @@
echo "Enable SSD TRIM for LUKS-encrypted drives"

# Only apply if the system uses LUKS encryption
if ! grep -q "cryptdevice=" /etc/default/limine 2>/dev/null; then
exit 0
fi

# Skip if allow-discards is already configured
if grep -q "allow-discards" /etc/default/limine 2>/dev/null; then
exit 0
fi

# Add :allow-discards to the cryptdevice= parameter in the boot config
# Format: cryptdevice=device:dmname -> cryptdevice=device:dmname:allow-discards
sudo sed -i 's/\(cryptdevice=[^ "]*\)/\1:allow-discards/' /etc/default/limine

# Extract the dmname from cryptdevice=device:dmname and enable allow-discards
# on the running LUKS device so TRIM works immediately
DMNAME=$(grep -oP 'cryptdevice=[^: "]+:\K[^: "]+' /etc/default/limine | head -1)
if [[ -n $DMNAME ]] && [[ -b /dev/mapper/$DMNAME ]]; then
sudo cryptsetup --allow-discards --persistent refresh "$DMNAME"
fi

# Regenerate initramfs and boot entry
sudo limine-mkinitcpio
sudo limine-update

echo "SSD TRIM enabled for LUKS encryption"