btrfs-rescue:tldr:a4e26

The command sudo btrfs rescue fix-device-size ${path-to-partition} is used to fix the size of a Btrfs filesystem device.

Here's a breakdown of the command:

• sudo is a command in Linux and Unix systems that allows a user with proper permissions to execute a command as a superuser or another user.
• btrfs is the command-line utility for managing Btrfs (B-tree file system), a modern file system for Linux operating systems.
• rescue is a subcommand in btrfs that provides functionality to rescue and recover data from a damaged or corrupted Btrfs filesystem.
• fix-device-size is a specific rescue subcommand in btrfs that is used to repair the device size of a Btrfs filesystem.
• ${path-to-partition} is a placeholder that denotes the path referring to the Btrfs filesystem device or partition. It should be replaced with the actual path to the device/partition (e.g., /dev/sdb1).

Therefore, when you run this command with proper permissions and provide the correct path to the Btrfs device/partition, it will attempt to fix the size of the device and potentially resolve any issues related to the device size within the Btrfs filesystem.