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Btrfs presentation at the LUG is available here.

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* btrfs btree *
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A btrfs filesystem consists in a collection of btrees:
* Chunk tree (referenced by superblock)
* Root tree (referenced by superblock)
- device tree
- extent tree
- checksum tree
- data relocation tree
- fs tree contains inode_item inode_ref dir_item dir_index extent_data. Here is an output example btrfs_1file_1subvol.txt.