restructure osx fallocate

src/fs_fallocate_osx.icpp

@@ -20,30 +20,30 @@
 #include "fs_fallocate.hpp"
 #include "fs_base_ftruncate.hpp"
 
-namespace fs
+static
+int
+_fallocate_core(const int   fd,
+                const off_t offset,
+                const off_t len)
 {
-  static
-  int
-  _fallocate_core(const int   fd,
-                  const off_t offset,
-                  const off_t len)
-  {
-    int rv;
-    fstore_t store = {F_ALLOCATECONTIG,F_PEOFPOSMODE,offset,len,0};
+  int rv;
+  fstore_t store = {F_ALLOCATECONTIG,F_PEOFPOSMODE,offset,len,0};
 
-    rv = ::fcntl(fd,F_PREALLOCATE,&store);
-    if(rv == -1)
-      {
-        store.fst_flags = F_ALLOCATEALL;
-        rv = ::fcntl(fd,F_PREALLOCATE,&store);
-      }
+  rv = ::fcntl(fd,F_PREALLOCATE,&store);
+  if(rv == -1)
+    {
+      store.fst_flags = F_ALLOCATEALL;
+      rv = ::fcntl(fd,F_PREALLOCATE,&store);
+    }
 
-    if(rv == -1)
-      return rv;
+  if(rv == -1)
+    return rv;
 
-    return ::ftruncate(fd,(offset+len));
-  }
+  return ::ftruncate(fd,(offset+len));
+}
 
+namespace fs
+{
   int
   fallocate(const int   fd,
             const int   mode,
@@ -53,6 +53,6 @@ namespace fs
     if(mode)
       return (errno=EOPNOTSUPP,-1);
 
-    return _fallocate_core(fd,offset,len);
+    return ::_fallocate_core(fd,offset,len);
   }
 }