LU-9489 lod: keep minimum LOVEA size

[fs/lustre-release.git] / lustre / lod / lod_internal.h

diff --git a/lustre/lod/lod_internal.h b/lustre/lod/lod_internal.h
index 03c19cc..b388347 100644 (file)
--- a/lustre/lod/lod_internal.h
+++ b/lustre/lod/lod_internal.h
@@ -560,6 +560,26 @@ lod_comp_inited(const struct lod_layout_component *entry)
        return entry->llc_flags & LCME_FL_INIT;
 }
 
+/**
+ * For a PFL file, some of its component could be un-instantiated, so
+ * that their lov_ost_data_v1 array is not needed, we'd use this function
+ * to reduce the LOVEA buffer size.
+ *
+ * Note: if llc_ostlist contains value, we'd need lov_ost_data_v1 array to
+ * save the specified OST index list.
+ */
+static inline void
+lod_comp_shrink_stripecount(struct lod_layout_component *lod_comp,
+                           __u16 *stripe_count)
+{
+       /**
+        * Need one lov_ost_data_v1 to store invalid ost_idx, please refer to
+        * lod_parse_striping()
+        */
+       if (!lod_comp_inited(lod_comp) && lod_comp->llc_ostlist.op_count == 0)
+               *stripe_count = 1;
+}
+
 void lod_fix_desc(struct lov_desc *desc);
 void lod_fix_desc_qos_maxage(__u32 *val);
 void lod_fix_desc_pattern(__u32 *val);