LU-8998 llapi: add LLAPI_LAYOUT_COMP_USE_PREV

[fs/lustre-release.git] / lustre / tests / llapi_layout_test.c

diff --git a/lustre/tests/llapi_layout_test.c b/lustre/tests/llapi_layout_test.c
index 805d235..a86dc5b 100644 (file)
--- a/lustre/tests/llapi_layout_test.c
+++ b/lustre/tests/llapi_layout_test.c
@@ -1483,6 +1483,21 @@ void test31(void)
                i++;
        } while (rc == 0);
 
+       /* Verify reverse iteration gives the same IDs as forward iteration */
+       rc = llapi_layout_comp_use(layout, LLAPI_LAYOUT_COMP_USE_LAST);
+       ASSERTF(rc == 0, "rc %d, errno %d", rc, errno);
+       do {
+               __u32 comp_id;
+
+               --i;
+               rc = llapi_layout_comp_id_get(layout, &comp_id);
+               ASSERTF(rc == 0 && comp_id == id[i],
+                       "i %d, errno %d, id[] %u/%u", i, errno, id[i], comp_id);
+
+               rc = llapi_layout_comp_use(layout, LLAPI_LAYOUT_COMP_USE_PREV);
+               ASSERTF(rc == 0 || i == 0, "i=%d rc=%d errno=%d", i, rc, errno);
+       } while (rc == 0);
+
        llapi_layout_free(layout);
 
        /* delete non-tail component will fail */