patch-2.1.32 linux/include/linux/nfsd/cache.h

• Lines: 80
• Date: Sun Dec 15 05:44:27 1996
• Orig file: v2.1.31/linux/include/linux/nfsd/cache.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.31/linux/include/linux/nfsd/cache.h linux/include/linux/nfsd/cache.h
@@ -0,0 +1,79 @@
+/*
+ * include/linux/nfsd/cache.h
+ *
+ * Request reply cache. This was heavily inspired by the
+ * implementation in 4.3BSD/4.4BSD.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef NFSCACHE_H
+#define NFSCACHE_H
+
+#ifdef __KERNEL__
+#include <linux/sched.h>
+
+/*
+ * Representation of a reply cache entry. The first two members *must*
+ * be hash_next and hash_prev.
+ */
+struct svc_cacherep {
+	struct svc_cacherep *	c_hash_next;
+	struct svc_cacherep *	c_hash_prev;
+	struct svc_cacherep *	c_lru_next;
+	struct svc_cacherep *	c_lru_prev;
+	unsigned char		c_state,	/* unused, inprog, done */
+				c_type,		/* status, buffer */
+				c_secure : 1;	/* req came from port < 1024 */
+	struct in_addr		c_client;
+	u32			c_xid;
+	u32			c_proc;
+	unsigned long		c_timestamp;
+	union {
+		struct svc_buf	u_buffer;
+		u32		u_status;
+	}			c_u;
+};
+
+#define c_replbuf		c_u.u_buffer
+#define c_replstat		c_u.u_status
+
+/* cache entry states */
+enum {
+	RC_UNUSED,
+	RC_INPROG,
+	RC_DONE
+};
+
+/* return values */
+enum {
+	RC_DROPIT,
+	RC_REPLY,
+	RC_DOIT,
+	RC_INTR
+};
+
+/*
+ * Cache types.
+ * We may want to add more types one day, e.g. for diropres and
+ * attrstat replies. Using cache entries with fixed length instead
+ * of buffer pointers may be more efficient.
+ */
+enum {
+	RC_NOCACHE,
+	RC_REPLSTAT,
+	RC_REPLBUFF,
+};
+
+/*
+ * If requests are retransmitted within this interval, they're dropped.
+ */
+#define RC_DELAY		(HZ/5)
+
+void	nfsd_cache_init(void);
+void	nfsd_cache_shutdown(void);
+int	nfsd_cache_lookup(struct svc_rqst *, int);
+void	nfsd_cache_update(struct svc_rqst *, int, u32 *);
+
+#endif /* __KERNEL__ */
+#endif /* NFSCACHE_H */