[PULL 13/13] tests/9pfs: add local Tunlinkat hard link test

[Christian Schoenebeck <qemu_oss@crudebyte.com>]

This test case uses a Tunlinkat request to remove a previously hard
linked file by using the 9pfs 'local' fs driver.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <9bec33a7d8f006ef8f80517985d0d6ac48650d53.1603285620.git.qemu_oss@crudebyte.com>
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
---
 tests/qtest/virtio-9p-test.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/tests/qtest/virtio-9p-test.c b/tests/qtest/virtio-9p-test.c
index 460fa49fe3..23433913bb 100644
--- a/tests/qtest/virtio-9p-test.c
+++ b/tests/qtest/virtio-9p-test.c
@@ -1391,6 +1391,34 @@ static void fs_hardlink_file(void *obj, void *data, QGuestAllocator *t_alloc)
     g_free(real_file);
 }
 
+static void fs_unlinkat_hardlink(void *obj, void *data,
+                                 QGuestAllocator *t_alloc)
+{
+    QVirtio9P *v9p = obj;
+    alloc = t_alloc;
+    struct stat st_real, st_link;
+    char *real_file = virtio_9p_test_path("08/real_file");
+    char *hardlink_file = virtio_9p_test_path("08/hardlink_file");
+
+    do_attach(v9p);
+    do_mkdir(v9p, "/", "08");
+    do_lcreate(v9p, "08", "real_file");
+    g_assert(stat(real_file, &st_real) == 0);
+    g_assert((st_real.st_mode & S_IFMT) == S_IFREG);
+
+    do_hardlink(v9p, "08", "hardlink_file", "08/real_file");
+    g_assert(stat(hardlink_file, &st_link) == 0);
+
+    do_unlinkat(v9p, "08", "hardlink_file", 0);
+    /* symlink should be gone now */
+    g_assert(stat(hardlink_file, &st_link) != 0);
+    /* and old file should still exist */
+    g_assert(stat(real_file, &st_real) == 0);
+
+    g_free(hardlink_file);
+    g_free(real_file);
+}
+
 static void *assign_9p_local_driver(GString *cmd_line, void *arg)
 {
     virtio_9p_assign_local_driver(cmd_line, "security_model=mapped-xattr");
@@ -1438,6 +1466,8 @@ static void register_virtio_9p_test(void)
     qos_add_test("local/unlinkat_symlink", "virtio-9p", fs_unlinkat_symlink,
                  &opts);
     qos_add_test("local/hardlink_file", "virtio-9p", fs_hardlink_file, &opts);
+    qos_add_test("local/unlinkat_hardlink", "virtio-9p", fs_unlinkat_hardlink,
+                 &opts);
 }
 
 libqos_init(register_virtio_9p_test);
-- 
2.20.1