Using the Btrfs backing store
The B-tree filesystem (Btrfs) is a COW filesystem that provides modern features such as dynamic inode allocation, compression, and online filesystem defragmentation - and most importantly for the purposes of this book, writable and read-only snapshots.
Without going into much detail about the design of Btrfs, the following diagram shows the main components of the filesystem:
Each Btrfs filesystem consists of a Btrfs Root Tree, which records the root block for the Extent Tree and Subvolume Tree. The root block pointers are updated with each transaction, to point to the new roots created by the transaction. The Extent Tree ...
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