+static inline bool
+lod_obj_is_ost_use_skip_cb(const struct lu_env *env, struct lod_object *lo,
+ int comp_idx, struct lod_obj_stripe_cb_data *data)
+{
+ struct lod_layout_component *comp = &lo->ldo_comp_entries[comp_idx];
+
+ return comp->llc_ost_indices == NULL;
+}
+
+static inline int
+lod_obj_is_ost_use_cb(const struct lu_env *env, struct lod_object *lo,
+ int comp_idx, struct lod_obj_stripe_cb_data *data)
+{
+ struct lod_layout_component *comp = &lo->ldo_comp_entries[comp_idx];
+ int i;
+
+ for (i = 0; i < comp->llc_stripe_count; i++) {
+ if (comp->llc_ost_indices[i] == data->locd_ost_index) {
+ data->locd_ost_index = -1;
+ return -EEXIST;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * Check is OST used in a composite layout
+ *
+ * \param[in] lo lod object
+ * \param[in] ost OST target index to check
+ *
+ * \retval false not used
+ * \retval true used
+ */
+static inline bool lod_comp_is_ost_used(const struct lu_env *env,
+ struct lod_object *lo, int ost)
+{
+ struct lod_obj_stripe_cb_data data = { { 0 } };
+
+ data.locd_ost_index = ost;
+ data.locd_comp_skip_cb = lod_obj_is_ost_use_skip_cb;
+ data.locd_comp_cb = lod_obj_is_ost_use_cb;
+
+ (void)lod_obj_for_each_stripe(env, lo, NULL, &data);
+
+ return data.locd_ost_index == -1;
+}
+
+static inline void lod_avoid_update(struct lod_object *lo,
+ struct lod_avoid_guide *lag)
+{
+ if (!lod_is_flr(lo))
+ return;
+
+ lag->lag_ost_avail--;
+}
+
+static inline bool lod_should_avoid_ost(struct lod_object *lo,
+ struct lod_avoid_guide *lag,
+ __u32 index)
+{
+ struct lod_device *lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
+ struct lod_tgt_desc *ost = OST_TGT(lod, index);
+ struct lod_qos_oss *lqo = ost->ltd_qos.ltq_oss;
+ bool used = false;
+ int i;
+
+ if (!cfs_bitmap_check(lod->lod_ost_bitmap, index)) {
+ QOS_DEBUG("OST%d: been used in conflicting mirror component\n",
+ index);
+ return true;
+ }
+
+ /**
+ * we've tried our best, all available OSTs have been used in
+ * overlapped components in the other mirror
+ */
+ if (lag->lag_ost_avail == 0)
+ return false;
+
+ /* check OSS use */
+ for (i = 0; i < lag->lag_oaa_count; i++) {
+ if (lag->lag_oss_avoid_array[i] == lqo->lqo_id) {
+ used = true;
+ break;
+ }
+ }
+ /**
+ * if the OSS which OST[index] resides has not been used, we'd like to
+ * use it
+ */
+ if (!used)
+ return false;
+
+ /* if the OSS has been used, check whether the OST has been used */
+ if (!cfs_bitmap_check(lag->lag_ost_avoid_bitmap, index))
+ used = false;
+ else
+ QOS_DEBUG("OST%d: been used in conflicting mirror component\n",
+ index);
+ return used;
+}
+