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calculate kernel args for swap file on btrfs
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| # taken from https://superuser.com/questions/1581885/btrfs-luks-swapfile-how-to-hibernate-on-swapfile | |
| wget "https://raw.githubusercontent.com/osandov/osandov-linux/61679ecd914d653bab14d0e752595e86b9f50513/scripts/btrfs_map_physical.c" && | |
| gcc -O2 -o btrfs_map_physical btrfs_map_physical.c && | |
| ./btrfs_map_physical $1 | sed -n "2p" | awk "{print \$NF}" >/tmp/swap_physical_offset | |
| SWAP_PHYSICAL_OFFSET=$(cat /tmp/swap_physical_offset) | |
| SWAP_OFFSET=$(echo "${SWAP_PHYSICAL_OFFSET} / $(getconf PAGESIZE)" | bc) | |
| SWAP_UUID=$(findmnt -no UUID -T $1) | |
| RESUME_ARGS="resume=UUID=${SWAP_UUID} resume_offset=${SWAP_OFFSET}" | |
| echo "${RESUME_ARGS}" |
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