+/* Statfs space reservation for grant, fragmentation, and unlink space. */
+#define OSD_STATFS_RESERVED_BLKS (1ULL << (22 - SPA_MAXBLOCKSHIFT)) /* 4MB */
+#define OSD_STATFS_RESERVED_SHIFT (7) /* reserve 0.78% of all space */
+
+/* Statfs {minimum, safe estimate, and maximum} dnodes per block */
+#define OSD_DNODE_MIN_BLKSHIFT (SPA_MAXBLOCKSHIFT - DNODE_SHIFT) /* 17-9 =8 */
+#define OSD_DNODE_EST_BLKSHIFT (SPA_MAXBLOCKSHIFT - 12) /* 17-12=5 */
+#define OSD_DNODE_EST_COUNT 1024
+
+#define OSD_GRANT_FOR_LOCAL_OIDS (2ULL << 20) /* 2MB for last_rcvd, ... */
+