prefetch now requires file_size to be passed in as a parameter

Calling stat from inside the prefetch-body has led users to
receive IOError: The message [<filename>] is not extractable.

1 files changed, 2 insertions, 1 deletions

diff --git a/tests/test_sftp.py b/tests/test_sftp.py
index cb8f7f84..55762c21 100755
--- a/tests/test_sftp.py
+++ b/tests/test_sftp.py
@@ -696,7 +696,8 @@ class SFTPTest (unittest.TestCase):
                 f.readv([(0, 12)])
 
             with sftp.open(FOLDER + '/zero', 'r') as f:
-                f.prefetch()
+                file_size = f.stat().st_size
+                f.prefetch(file_size)
                 f.read(100)
         finally:
             sftp.unlink(FOLDER + '/zero')