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-rw-r--r--fs/nfs/callback.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/nfs/callback.h b/fs/nfs/callback.h
index 9b907f408b8d..29123b5604f2 100644
--- a/fs/nfs/callback.h
+++ b/fs/nfs/callback.h
@@ -70,6 +70,13 @@ extern void nfs_callback_down(void);
#define nfs_callback_down() do {} while(0)
#endif
+/*
+ * nfs41: Callbacks are expected to not cause substantial latency,
+ * so we limit their concurrency to 1 by setting up the maximum number
+ * of slots for the backchannel.
+ */
+#define NFS41_BC_MIN_CALLBACKS 1
+
extern unsigned int nfs_callback_set_tcpport;
extern unsigned short nfs_callback_tcpport;
extern unsigned short nfs_callback_tcpport6;