fs: improve retriable error detection

fs/retriable_errors.go

@@ -0,0 +1,21 @@
+// +build !plan9
+
+package fs
+
+import (
+	"syscall"
+)
+
+func init() {
+	retriableErrors = append(retriableErrors,
+		syscall.EPIPE,
+		syscall.ETIMEDOUT,
+		syscall.ECONNREFUSED,
+		syscall.EHOSTDOWN,
+		syscall.EHOSTUNREACH,
+		syscall.ECONNABORTED,
+		syscall.EAGAIN,
+		syscall.EWOULDBLOCK,
+		syscall.ECONNRESET,
+	)
+}