fsync power loss

The fsync power loss tag covers discussions about filesystem behavior when a crash or power failure interrupts an fsync operation. Content focuses on Linux kernel bugs, particularly in Btrfs, where metadata ordering issues during fsync can lead to log replay failures and mount errors after power loss. Topics include CVE-2026-46160, which describes a Btrfs bug where directory unlink fails after a crash, causing -EIO errors. The tag highlights how filesystem bugs can affect system reliability after unexpected shutdowns, emphasizing the importance of correct metadata handling in journaling or copy-on-write filesystems. It is relevant for users and administrators concerned with data integrity and recovery after power loss events.