+#ifdef HAVE_PERCPU_SB
+
+/*
+ * Valid per-cpu incore superblock counters. Note that if you add new counters,
+ * you may need to define new counter disabled bit field descriptors as there
+ * are more possible fields in the superblock that can fit in a bitfield on a
+ * 32 bit platform. The XFS_SBS_* values for the current current counters just
+ * fit.
+ */
+typedef struct xfs_icsb_cnts {
+ uint64_t icsb_fdblocks;
+ uint64_t icsb_ifree;
+ uint64_t icsb_icount;
+ unsigned long icsb_flags;
+} xfs_icsb_cnts_t;
+
+#define XFS_ICSB_FLAG_LOCK (1 << 0) /* counter lock bit */
+
+#define XFS_ICSB_SB_LOCKED (1 << 0) /* sb already locked */
+#define XFS_ICSB_LAZY_COUNT (1 << 1) /* accuracy not needed */
+
+extern int xfs_icsb_init_counters(struct xfs_mount *);
+extern void xfs_icsb_sync_counters_lazy(struct xfs_mount *);
+
+#else
+#define xfs_icsb_init_counters(mp) (0)
+#define xfs_icsb_sync_counters_lazy(mp) do { } while (0)
+#endif