make django_storage.FSStorage raise OSError, not FSError

fs/expose/django_storage.py

@@ -9,8 +9,8 @@ Use an FS object for Django File Storage
 from django.conf import settings
 from django.core.files.storage import Storage
 
-from fs.path import abspath
-
+from fs.path import abspath, dirname
+from fs.errors import convert_fs_errors
 
 class FSStorage(Storage):
     """Expose an FS object as a Django File Storage object."""
@@ -34,19 +34,25 @@ class FSStorage(Storage):
             raise NotImplementedError
         return path
 
+    @convert_fs_errors
     def size(self,name):
         return self.fs.getsize(name)
 
+    @convert_fs_errors
     def url(self,name):
         return self.base_url + abspath(name)
 
+    @convert_fs_errors
     def _open(self,name,mode):
-        return selfs.fs.open(name,mode)
+        return self.fs.open(name,mode)
 
+    @convert_fs_errors
     def _save(self,name,content):
+        self.fs.makedir(dirname(name),allow_recreate=True,recursive=True)
         self.fs.setcontents(name,content)
         return name
 
+    @convert_fs_errors
     def delete(self,name):
         try:
             self.fs.remove(name)

fs/wrapfs/lazyfs.py

@@ -40,7 +40,7 @@ class LazyFS(WrapFS):
         self._lazy_creation_lock = Lock()
 
     def _get_wrapped_fs(self):
-        """Obtain the wrapped FS instance, created it if necessary."""
+        """Obtain the wrapped FS instance, creating it if necessary."""
         try:
             return self.__dict__["wrapped_fs"]
         except KeyError: