LU-2722 clio: directIO thread races with completion thread

[fs/lustre-release.git] / lustre / obdclass / cl_page.c

diff --git a/lustre/obdclass/cl_page.c b/lustre/obdclass/cl_page.c
index b34555a..29a570c 100644 (file)
--- a/lustre/obdclass/cl_page.c
+++ b/lustre/obdclass/cl_page.c
@@ -1319,8 +1319,17 @@ void cl_page_completion(const struct lu_env *env,
                 LASSERT(cl_page_is_vmlocked(env, pg));
                 LASSERT(pg->cp_sync_io == anchor);
                 pg->cp_sync_io = NULL;
+       }
+       /*
+        * As page->cp_obj is pinned by a reference from page->cp_req, it is
+        * safe to call cl_page_put() without risking object destruction in a
+        * non-blocking context.
+        */
+       cl_page_put(env, pg);
+
+       if (anchor)
                 cl_sync_io_note(anchor, ioret);
-        }
+
         EXIT;
 }
 EXPORT_SYMBOL(cl_page_completion);