Resizing btrfs filesystems
With btrfs, it's possible to resize the btrfs filesystem when it is online and is being accessed by users. The size of a filesystem will grow automatically if we add or remove devices; we will see this in the next subsection of this chapter; however; we can resize the filesystem should we need to even on a single device that we have created. Using the following command, we will shrink the assigned space to the filesystem by 500MiB:
# btrfs filesystem resize -500m /data/simple
If we check the size of the filesystem before and after, we can see the dynamic change that takes place:
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