[Bug 236557] [FUSE]: special case ENOSYS for several FUSE opcodes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236557

            Bug ID: 236557
           Summary: [FUSE]: special case ENOSYS for several FUSE opcodes
           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

Several FUSE opcodes have a special meaning for ENOSYS.  At protocol level 7.8,
these are:

* SETXATTR, REMOVEXATTR, LISTXATTR, GETXATTR: permanent failure.  Subsequent
calls will fail automatically without querying the filesystem
* ACCESS, FLUSH, FSYNC, FSYNCDIR: permanent success.  Subsequent calls will
succeed automatically without querying the daemon
* CREATE: Subsequent calls will use MKNOD/OPEN instead of CREATE.

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