shrink btrfs

scripts/tile_gen/extract_btrfs.sh

@@ -9,17 +9,25 @@ rm -f image.btrfs
 # make sure it's bigger then the current OSM output
 fallocate -l 300G image.btrfs
 
+fallocate -l 10G image.btrfs
 
-mkfs.btrfs -v image.btrfs
+
+
+
+
+# metadata: single needed as default is now DUP
+mkfs.btrfs -v \
+  -m single \
+  image.btrfs
 
 # https://btrfs.readthedocs.io/en/latest/btrfs-man5.html#mount-options
-# compression: zstd:1 or lzo
+# compression doesn't make sense, data is already gzip compressed
 
-mkdir mnt
+mkdir -p mnt
 sudo mount -v \
   -t btrfs \
-  -o noacl,nobarrier,noatime,compress-force=lzo,max_inline=4096 \
-  image.btrfs mnt
+  -o noacl,nobarrier,noatime,max_inline=4096 \
+  image2.btrfs mnt
 
 
 sudo chown ofm:ofm -R mnt
@@ -27,7 +35,16 @@ sudo chown ofm:ofm -R mnt
 ../../tile_gen/venv/bin/python ../../tile_gen/extract.py output.mbtiles mnt/extract \
   > "extract_out.log" 2> "extract_err.log"
 
+
+# resize to min possible size
+btrfs filesystem usage -b mnt
+
+btrfs filesystem resize -10G mnt
+sudo btrfs filesystem resize -100M mnt
+
+
 sudo umount mnt
 
 
 
+