fs/spiffs: I have been test with apps/examples/fstest which provides a good exercise but of the FS internals but not of the user interface. I build an SPIFFS aware NSH configuration and found and fixed a number of glaring usability errors: (1) Missing logic to stat the SPIFFS root directory, (2) Confusion in use to two similarly named struct field... caused files to be unexpectedly deleted. (3) Fixed a sempahore deadlock condition. And (5) Fix /procfs/mount. It was unaware of the SPIFFS file system type.

fs/mount/fs_gettype.c

@@ -108,6 +108,12 @@ FAR const char *fs_gettype(FAR struct statfs *statbuf)
         break;
 #endif
 
+#ifdef CONFIG_FS_SPIFFS
+      case SPIFFS_SUPER_MAGIC:
+        fstype = "spiffs";
+        break;
+#endif
+
 #ifdef CONFIG_NFS
       case NFS_SUPER_MAGIC:
         fstype = "nfs";