[$] Filesystems and crash resistance

The "guarantees" that existing filesystems make with regard to persistencein the face of a system crash was the subject of a session led by AmirGoldstein at the 2019 Linux Storage, Filesystem, and Memory-ManagementSummit (LSFMM). The problem is that filesystem developers are not willingto make much in the way of guarantees unless applications call fsync()-somethingthat is not popular with application developers, who want a cheaper option.