[PATCH v2 7/7] tests/9pfs: check fid being unaffected in fs_walk_2nd_nonexistent

[Christian Schoenebeck]

Extend previously added test case by checking that fid is unaffected
by 'Twalk' request (i.e. when 2nd path component of request being
invalid). Do that by comparing the QID of root fid with QID of walked
fid; they should be identical.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
---
 tests/qtest/virtio-9p-test.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/tests/qtest/virtio-9p-test.c b/tests/qtest/virtio-9p-test.c
index f6e78d388e..b9c6819d01 100644
--- a/tests/qtest/virtio-9p-test.c
+++ b/tests/qtest/virtio-9p-test.c
@@ -721,14 +721,19 @@ static void fs_version(void *obj, void *data, 
QGuestAllocator *t_alloc)
     do_version(obj);
 }
 
-static void do_attach(QVirtio9P *v9p)
+static void do_attach_rqid(QVirtio9P *v9p, v9fs_qid *qid)
 {
     P9Req *req;
 
     do_version(v9p);
     req = v9fs_tattach(v9p, 0, getuid(), 0);
     v9fs_req_wait_for_reply(req, NULL);
-    v9fs_rattach(req, NULL);
+    v9fs_rattach(req, qid);
+}
+
+static void do_attach(QVirtio9P *v9p)
+{
+    do_attach_rqid(v9p, NULL);
 }
 
 static void fs_attach(void *obj, void *data, QGuestAllocator *t_alloc)
@@ -1101,19 +1106,22 @@ static void fs_walk_2nd_nonexistent(void *obj, void 
*data,
 {
     QVirtio9P *v9p = obj;
     alloc = t_alloc;
+    v9fs_qid root_qid;
     uint16_t nwqid;
     g_autofree v9fs_qid *wqid = NULL;
     g_autofree char *path = g_strdup_printf(
         QTEST_V9FS_SYNTH_WALK_FILE "/non-existent", 0
     );
 
-    do_attach(v9p);
+    do_attach_rqid(v9p, &root_qid);
     do_walk_rqids(v9p, path, &nwqid, &wqid);
     /*
      * The 9p2000 protocol spec says: "nwqid is therefore either nwname or the
      * index of the first elementwise walk that failed."
      */
     assert(nwqid == 1);
+    /* expect fid being unaffected by walk */
+    g_assert(wqid && wqid[0] && is_same_qid(root_qid, wqid[0]));
 }
 
 static void fs_walk_none(void *obj, void *data, QGuestAllocator *t_alloc)
-- 
2.30.2