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This is an old revision of the document!

SWAP on Btrfs

SWAP on BTRFS is supported since Kernel 5.0.7. SWAP cannot be located on snapshoted volume. The best is to create seperate volume for swap file.

Get top level ID of BTRFS: 

btrfs sub list /

ID 256 gen 394 top level 5 path @
ID 258 gen 401 top level 5 path @home
...
mkdir -p /mnt/btrfs
mount -o subvolid=5 /dev/... /mnt/btrfs
cd /mnt/btrfs
btrfs sub create @swap
cd @swap
 
truncate -s 0 ./swapfile
chattr +C ./swapfile
btrfs property set ./swapfile compression none
 
fallocate --length 8.2GB swapfile
chown root swapfile 
chmod 600 swapfile 
mkswap swapfile 
swapon swapfile
 
umount /mnt/btrfs
 
mkdir /.swap
UUID=1cf7e34b-8b09-45bd-80ae-f4658b3e0509 /.swap     btrfs    compress=none,nodatacow,noatime,subvol=@swap

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