btrfs-progs/Documentation/ch-flexibility.rst

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The underlying design of BTRFS data structures allows a lot of flexibility and
making changes after filesystem creation, like resizing, adding/removing space
or enabling some features on-the-fly.
* **dynamic inode creation** -- there's no fixed space or tables for tracking
inodes so the number of inodes that can be created is bounded by the metadata
space and it's utilization
* **block group profile change on-the-fly** -- the block group profiles can be
changed on a mounted filesystem by running the balance operation and
specifying the conversion filters
* **resize** -- the space occupied by the filesystem on each device can be
resized up (grow) or down (shrink) as long as the amount of data can be still
contained on the device