LU-9771 flr: mirror read and write

[fs/lustre-release.git] / lustre / utils / liblustreapi_layout.c

diff --git a/lustre/utils/liblustreapi_layout.c b/lustre/utils/liblustreapi_layout.c
index 5f474b8..8984e33 100644 (file)
--- a/lustre/utils/liblustreapi_layout.c
+++ b/lustre/utils/liblustreapi_layout.c
@@ -1708,6 +1708,33 @@ int llapi_layout_comp_id_get(const struct llapi_layout *layout, uint32_t *id)
 }
 
 /**
+ * Return the mirror id of the current layout component.
+ *
+ * \param[in] layout   the layout component
+ * \param[out] id      stored the returned mirror ID
+ *
+ * \retval     0 on success
+ * \retval     <0 if error occurs
+ */
+int llapi_layout_mirror_id_get(const struct llapi_layout *layout, uint32_t *id)
+{
+       struct llapi_layout_comp *comp;
+
+       comp = __llapi_layout_cur_comp(layout);
+       if (comp == NULL)
+               return -1;
+
+       if (id == NULL) {
+               errno = EINVAL;
+               return -1;
+       }
+
+       *id = mirror_id_of(comp->llc_id);
+
+       return 0;
+}
+
+/**
  * Adds a component to \a layout, the new component will be added to
  * the tail of components list and it'll inherit attributes of existing
  * ones. The \a layout will change it's current component pointer to