Initial commit

Proof-of-concept implementation. Bugs will occur.

vendor/github.com/hanwen/go-fuse/v2/fuse/poll.go

@@ -0,0 +1,52 @@
+package fuse
+
+// Go 1.9 introduces polling for file I/O. The implementation causes
+// the runtime's epoll to take up the last GOMAXPROCS slot, and if
+// that happens, we won't have any threads left to service FUSE's
+// _OP_POLL request. Prevent this by forcing _OP_POLL to happen, so we
+// can say ENOSYS and prevent further _OP_POLL requests.
+const pollHackName = ".go-fuse-epoll-hack"
+const pollHackInode = ^uint64(0)
+
+func doPollHackLookup(ms *protocolServer, req *request) {
+	attr := Attr{
+		Ino:   pollHackInode,
+		Mode:  S_IFREG | 0644,
+		Nlink: 1,
+	}
+	switch req.inHeader().Opcode {
+	case _OP_LOOKUP:
+		out := (*EntryOut)(req.outData())
+		*out = EntryOut{
+			NodeId: pollHackInode,
+			Attr:   attr,
+		}
+		req.status = OK
+	case _OP_OPEN:
+		out := (*OpenOut)(req.outData())
+		*out = OpenOut{
+			Fh: pollHackInode,
+		}
+		req.status = OK
+	case _OP_GETATTR, _OP_SETATTR:
+		out := (*AttrOut)(req.outData())
+		out.Attr = attr
+		req.status = OK
+	case _OP_GETXATTR:
+		// Kernel will try to read acl xattrs. Pretend we don't have any.
+		req.status = ENODATA
+	case _OP_POLL:
+		req.status = ENOSYS
+
+	case _OP_ACCESS, _OP_FLUSH, _OP_RELEASE:
+		// Avoid upsetting the OSX mount process.
+		req.status = OK
+	default:
+		// We want to avoid switching off features through our
+		// poll hack, so don't use ENOSYS. It would be nice if
+		// we could transmit no error code at all, but for
+		// some opcodes, we'd have to invent credible data to
+		// return as well.
+		req.status = ERANGE
+	}
+}