[Bug 236473] [FUSE] fsync never syncs metadata on fuse(4)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236473

            Bug ID: 236473
           Summary: [FUSE] fsync never syncs metadata on fuse(4)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

The FUSE_FSYNC operations has a flags parameter.  If bit 0 is set, then the
filesystem should do an "fdatasync" instead of "fsync".  Oddly, FreeBSD's
fuse(4) driver _always_ sets that bit.  I suspect that the original GSoC
student didn't understand what it meant.  The consequence is that an fsync(2)
will not safely sync a file's metadata to disk, if that file is on fuse.

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