LU-15840 lov: return st_blocks=1 for HSM released files

[fs/lustre-release.git] / lustre / lov / lov_object.c

diff --git a/lustre/lov/lov_object.c b/lustre/lov/lov_object.c
index 865635e..9f78d62 100644 (file)
--- a/lustre/lov/lov_object.c
+++ b/lustre/lov/lov_object.c
@@ -1032,6 +1032,25 @@ static int lov_attr_get_empty(const struct lu_env *env, struct cl_object *obj,
        return 0;
 }
 
+/**
+ * The MDT returns st_blocks=1 for the HSM released file (See LU-3864).
+ * The LOV layouer should also return st_blocks=1 for the HSM released file
+ * in the call ->coo_attr_get().
+ * Otherwise, the client may get 0 block count. This caused tools like tar
+ * then to consider the file as fully sparse and to archive it as is without
+ * attempting to access/restore its content.
+ */
+static int lov_attr_get_released(const struct lu_env *env,
+                                struct cl_object *obj, struct cl_attr *attr)
+{
+       if (attr->cat_size == 0)
+               attr->cat_blocks = 0;
+       else
+               attr->cat_blocks = 1;
+
+       return 0;
+}
+
 static int lov_attr_get_composite(const struct lu_env *env,
                                  struct cl_object *obj,
                                  struct cl_attr *attr)
@@ -1138,7 +1157,7 @@ const static struct lov_layout_operations lov_dispatch[] = {
                .llo_page_init = lov_page_init_empty,
                .llo_lock_init = lov_lock_init_empty,
                .llo_io_init   = lov_io_init_released,
-               .llo_getattr   = lov_attr_get_empty,
+               .llo_getattr   = lov_attr_get_released,
                .llo_flush     = lov_flush_empty,
        },
        [LLT_COMP] = {