What command is used to fix filesystem problems on an XFS file system?

The command used to fix filesystem problems on an XFS file system is xfs_repair. This utility is specifically designed for repairing XFS file systems that may have developed issues due to corruption or unexpected shutdowns.

When a filesystem is uncleanly unmounted or if it suffers from other forms of corruption, xfs_repair can be employed to analyze and rectify these problems. It checks the filesystem's data structures and makes necessary corrections, ensuring data integrity and recoverability.

While there are other related utilities for different types of filesystems, such as fsck for ext-based filesystems, xfs_check is primarily used to examine an XFS filesystem without making modifications. Similarly, the other options mentioned do not correspond to valid or effective commands for repairing XFS filesystems. Therefore, xfs_repair is the appropriate and correct choice for addressing and fixing issues within XFS file systems.