[PATCH v2 6/6] tests/9p: Test `Tsetattr` can truncate unlinked file

[Greg Kurz]

Enhance the `use-after-unlink` test with a new check for the
case where the client wants to alter the size of an unlinked
file for which it still has an active fid.

Suggested-by: Christian Schoenebeck <qemu_...@crudebyte.com>
Signed-off-by: Greg Kurz <gr...@kaod.org>
---
 tests/qtest/virtio-9p-test.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tests/qtest/virtio-9p-test.c b/tests/qtest/virtio-9p-test.c
index f515a9bb157b..20c0d744fa56 100644
--- a/tests/qtest/virtio-9p-test.c
+++ b/tests/qtest/virtio-9p-test.c
@@ -736,6 +736,14 @@ static void fs_use_after_unlink(void *obj, void *data,
         .data = buf
     }).count;
     g_assert_cmpint(count, ==, write_count);
+
+    /* truncate file to (arbitrarily chosen) size 2001 */
+    tsetattr({
+        .client = v9p, .fid = fid_file, .attr = (v9fs_attr) {
+            .valid = P9_SETATTR_SIZE,
+            .size = 2001
+        }
+     });
 }
 
 static void cleanup_9p_local_driver(void *data)
-- 
2.48.1