Index: subversion/libsvn_fs_base/fs.c
===================================================================
--- subversion/libsvn_fs_base/fs.c	(revision 24495)
+++ subversion/libsvn_fs_base/fs.c	(working copy)
@@ -58,6 +58,7 @@
 
 #include "../libsvn_fs/fs-loader.h"
 #include "private/svn_fs_merge_info.h"
+#include "private/svn_fs_util.h"
 
 
 /* Checking for return values, and reporting errors.  */
@@ -98,19 +99,6 @@
   return SVN_NO_ERROR;
 }
 
-
-/* If FS is already open, then return an SVN_ERR_FS_ALREADY_OPEN
-   error.  Otherwise, return zero.  */
-static svn_error_t *
-check_already_open(svn_fs_t *fs)
-{
-  if (fs->fsap_data)
-    return svn_error_create(SVN_ERR_FS_ALREADY_OPEN, 0,
-                            _("Filesystem object already open"));
-  else
-    return SVN_NO_ERROR;
-}
-
 
 /* Cleanup functions.  */
 
@@ -515,7 +503,7 @@
 {
   base_fs_data_t *bfd;
 
-  SVN_ERR(check_already_open(fs));
+  SVN_ERR(svn_fs__check_already_open(fs));
 
   bfd = apr_pcalloc(fs->pool, sizeof(*bfd));
   fs->vtable = &fs_vtable;
Index: subversion/libsvn_fs_fs/fs.c
===================================================================
--- subversion/libsvn_fs_fs/fs.c	(revision 24495)
+++ subversion/libsvn_fs_fs/fs.c	(working copy)
@@ -36,6 +36,7 @@
 #include "svn_private_config.h"
 
 #include "../libsvn_fs/fs-loader.h"
+#include "private/svn_fs_util.h"
 
 /* A prefix for the pool userdata variables used to hold
    per-filesystem shared data.  See fs_serialized_init. */
@@ -43,21 +44,7 @@
 
 
 
-/* If filesystem FS is already open, then return an
-   SVN_ERR_FS_ALREADY_OPEN error.  Otherwise, return zero.  */
 static svn_error_t *
-check_already_open(svn_fs_t *fs)
-{
-  if (fs->fsap_data)
-    return svn_error_create(SVN_ERR_FS_ALREADY_OPEN, 0,
-                            _("Filesystem object already open"));
-  else
-    return SVN_NO_ERROR;
-}
-
-
-
-static svn_error_t *
 fs_serialized_init(svn_fs_t *fs, apr_pool_t *common_pool, apr_pool_t *pool)
 {
   fs_fs_data_t *ffd = fs->fsap_data;
@@ -172,7 +159,7 @@
 {
   fs_fs_data_t *ffd;
 
-  SVN_ERR(check_already_open(fs));
+  SVN_ERR(svn_fs__check_already_open(fs));
 
   ffd = apr_pcalloc(fs->pool, sizeof(*ffd));
   fs->vtable = &fs_vtable;
Index: subversion/libsvn_fs_util/fs-util.c
===================================================================
--- subversion/libsvn_fs_util/fs-util.c	(revision 24495)
+++ subversion/libsvn_fs_util/fs-util.c	(working copy)
@@ -21,8 +21,12 @@
 #include <apr_pools.h>
 #include <apr_strings.h>
 
+#include "svn_fs.h"
 #include "svn_path.h"
+#include "svn_private_config.h"
+
 #include "private/svn_fs_util.h"
+#include "../libsvn_fs/fs-loader.h"
 
 const char *
 svn_fs__canonicalize_abspath(const char *path, apr_pool_t *pool)
@@ -82,3 +86,13 @@
   return newpath;
 }
 
+svn_error_t *
+svn_fs__check_already_open(svn_fs_t *fs)
+{
+  if (fs->path)
+    return svn_error_create(SVN_ERR_FS_ALREADY_OPEN, 0,
+                            _("Filesystem object already open"));
+  else
+    return SVN_NO_ERROR;
+}
+
Index: subversion/include/private/svn_fs_util.h
===================================================================
--- subversion/include/private/svn_fs_util.h	(revision 24495)
+++ subversion/include/private/svn_fs_util.h	(working copy)
@@ -35,6 +35,11 @@
 const char *
 svn_fs__canonicalize_abspath(const char *path, apr_pool_t *pool);
 
+/* If filesystem is already open, then return an
+   SVN_ERR_FS_ALREADY_OPEN error.  Otherwise, return zero.  */
+svn_error_t *
+svn_fs__check_already_open(svn_fs_t *fs);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */