Allow inode cache invalidation in high-level API

We re-introduce the functionality of invalidating the caches for an
inode specified by path by adding a new routine
fuse_invalidate_path. This is useful for network-based file systems
which use the high-level API, enabling them to notify the kernel about
external changes.

This is a revival of Miklos Szeredi's original code for the
fuse_invalidate routine.

1 files changed, 26 insertions, 2 deletions

diff --git a/test/test_ctests.py b/test/test_ctests.py
index 4ad03fb..2da55e5 100644
--- a/test/test_ctests.py
+++ b/test/test_ctests.py
@@ -13,6 +13,7 @@ from distutils.version import LooseVersion
 from util import (wait_for_mount, umount, cleanup, base_cmdline,
                   safe_sleep, basename, fuse_test_marker)
 from os.path import join as pjoin
+import os.path
 
 pytestmark = fuse_test_marker()
 
@@ -34,7 +35,7 @@ def test_write_cache(tmpdir, writeback):
     subprocess.check_call(cmdline)
 
 
-names = [ 'notify_inval_inode' ]
+names = [ 'notify_inval_inode', 'notify_inval_inode_fh' ]
 if sys.platform == 'linux':
     names.append('notify_store_retrieve')
 @pytest.mark.parametrize("name", names)
@@ -65,4 +66,27 @@ def test_notify1(tmpdir, name, notify):
     else:
         umount(mount_process, mnt_dir)
 
-    
+@pytest.mark.parametrize("notify", (True, False))
+def test_notify_file_size(tmpdir, notify):
+    mnt_dir = str(tmpdir)
+    cmdline = base_cmdline + \
+              [ pjoin(basename, 'example', 'notify_inval_inode_fh'),
+                '-f', '--update-interval=1', mnt_dir ]
+    if not notify:
+        cmdline.append('--no-notify')
+    mount_process = subprocess.Popen(cmdline)
+    try:
+        wait_for_mount(mount_process, mnt_dir)
+        filename = pjoin(mnt_dir, 'growing')
+        size = os.path.getsize(filename)
+        safe_sleep(2)
+        new_size = os.path.getsize(filename)
+        if notify:
+            assert new_size > size
+        else:
+            assert new_size == size
+    except:
+        cleanup(mnt_dir)
+        raise
+    else:
+        umount(mount_process, mnt_dir)