[adaszko]

Tomas Vondra goes over this in the talk. There's a rationale for that behavior: pulling out a USB stick out of the USB socket may have been what's triggered the fsync() failure. In that case, there's no way the kernel will be able to retry reliably.

[pas]

Silent error ignoring is never a great API. Especially for a data integrity operation.

fsync in case of the USB disappearing should simply return an error and drop the dirty pages.