fs Add unmount subcommand

user/fs/main.c

@@ -5,7 +5,7 @@
 #define CMDS(X)                     \
   X(fetch)    X(mkf)    X(mkd)      \
   X(tree)     X(mount)  X(del)      \
-  X(fmt)
+  X(fmt)      X(unmount)
 
 void main(void) {
   if (argslen() == 0) {

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);
+  }
+}