Update cheatsheets

linux/mkfs.btrfs

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mkfs.btrfs
+
+> Create a BTRFS filesystem.
+> Defaults to `raid1`, which specifies 2 copies of a data block spread across 2 different devices.
+> More information: <https://btrfs.readthedocs.io/en/latest/mkfs.btrfs.html>.
+
+- Create a btrfs filesystem on a single device:
+
+`sudo mkfs.btrfs --metadata single --data single {{/dev/sda}}`
+
+- Create a btrfs filesystem on multiple devices with raid1:
+
+`sudo mkfs.btrfs --metadata raid1 --data raid1 {{/dev/sda}} {{/dev/sdb}} {{/dev/sdN}}`
+
+- Set a label for the filesystem:
+
+`sudo mkfs.btrfs --label "{{label}}" {{/dev/sda}} [{{/dev/sdN}}]`