fs Add unmount subcommand

user/fs/unmount.c

@@ -0,0 +1,20 @@
+#include <stdint.h>
+#include <stddef.h>
+#include <ulib.h>
+
+void fs_unmount(void) {
+  if (argslen() < 2) {
+    uprintf("fs: Not enough arguments\n");
+    return;
+  }
+
+  char *mountpoint = *(args()+1);
+
+  int32_t ret = vfsunmount(mountpoint);
+
+  if (ret != E_OK) {
+    uprintf("fs: Could not unmount %s\n", mountpoint);
+  } else {
+    uprintf("OK %s\n", mountpoint);
+  }
+}