Metadata nodes in chunk at address 1500000

Explanation

The metadata of a BTRFS file system is organized in the form of multiple B-trees, which consist of nodes. Each node is 16 KiB in size.

This page shows the contents of a single metadata chunk. Every little box is one node of 16 KiB. Together they add up to the total size of the chunk. We show 64 nodes per row, so each row is 1 MiB.

The colors indicate which B-tree the node belongs to. Most of them belong to the filesystem trees. There is one filesystem tree for every subvolume, but we draw them all in the same color here. The other trees are:

root tree
extent tree
chunk tree
device tree
checksum tree
uuid tree
free space tree
other trees
filesystem trees