Add the new kernel-mode NFS Lock Manager. To use it instead of the

user-mode lock manager, build a kernel with the NFSLOCKD option and
add '-k' to 'rpc_lockd_flags' in rc.conf.

Highlights include:

* Thread-safe kernel RPC client - many threads can use the same RPC
  client handle safely with replies being de-multiplexed at the socket
  upcall (typically driven directly by the NIC interrupt) and handed
  off to whichever thread matches the reply. For UDP sockets, many RPC
  clients can share the same socket. This allows the use of a single
  privileged UDP port number to talk to an arbitrary number of remote
  hosts.

* Single-threaded kernel RPC server. Adding support for multi-threaded
  server would be relatively straightforward and would follow
  approximately the Solaris KPI. A single thread should be sufficient
  for the NLM since it should rarely block in normal operation.

* Kernel mode NLM server supporting cancel requests and granted
  callbacks. I've tested the NLM server reasonably extensively - it
  passes both my own tests and the NFS Connectathon locking tests
  running on Solaris, Mac OS X and Ubuntu Linux.

* Userland NLM client supported. While the NLM server doesn't have
  support for the local NFS client's locking needs, it does have to
  field async replies and granted callbacks from remote NLMs that the
  local client has contacted. We relay these replies to the userland
  rpc.lockd over a local domain RPC socket.

* Robust deadlock detection for the local lock manager. In particular
  it will detect deadlocks caused by a lock request that covers more
  than one blocking request. As required by the NLM protocol, all
  deadlock detection happens synchronously - a user is guaranteed that
  if a lock request isn't rejected immediately, the lock will
  eventually be granted. The old system allowed for a 'deferred
  deadlock' condition where a blocked lock request could wake up and
  find that some other deadlock-causing lock owner had beaten them to
  the lock.

* Since both local and remote locks are managed by the same kernel
  locking code, local and remote processes can safely use file locks
  for mutual exclusion. Local processes have no fairness advantage
  compared to remote processes when contending to lock a region that
  has just been unlocked - the local lock manager enforces a strict
  first-come first-served model for both local and remote lockers.

Sponsored by:	Isilon Systems
PR:		95247 107555 115524 116679
MFC after:	2 weeks

1 files changed, 99 insertions, 0 deletions

diff --git a/sys/rpc/netconfig.h b/sys/rpc/netconfig.h
new file mode 100644
index 0000000..d49b925
--- /dev/null
+++ b/sys/rpc/netconfig.h
@@ -0,0 +1,99 @@
+/*	$NetBSD: netconfig.h,v 1.1 2000/06/02 22:57:54 fvdl Exp $	*/
+/*	$FreeBSD$ */
+
+
+#ifndef _NETCONFIG_H_
+#define _NETCONFIG_H_
+
+#include <sys/cdefs.h>
+
+#define NETCONFIG	"/etc/netconfig"
+#define NETPATH		"NETPATH"
+
+struct netconfig {
+	char *nc_netid;			/* Network ID */
+	unsigned long nc_semantics;	/* Semantics (see below) */
+	unsigned long nc_flag;		/* Flags (see below) */
+	char *nc_protofmly;		/* Protocol family */
+	char *nc_proto;			/* Protocol name */
+	char *nc_device;		/* Network device pathname */
+	unsigned long nc_nlookups;	/* Number of directory lookup libs */
+	char **nc_lookups;		/* Names of the libraries */
+	unsigned long nc_unused[9];	/* reserved */
+};
+
+typedef struct {
+	struct netconfig **nc_head;
+	struct netconfig **nc_curr;
+} NCONF_HANDLE;
+
+/*
+ * nc_semantics values
+ */
+#define NC_TPI_CLTS	1
+#define NC_TPI_COTS	2
+#define NC_TPI_COTS_ORD	3
+#define NC_TPI_RAW	4
+
+/*
+ * nc_flag values
+ */
+#define NC_NOFLAG	0x00
+#define NC_VISIBLE	0x01
+#define NC_BROADCAST	0x02
+
+/*
+ * nc_protofmly values
+ */
+#define NC_NOPROTOFMLY	"-"
+#define NC_LOOPBACK	"loopback"
+#define NC_INET		"inet"
+#define NC_INET6	"inet6"
+#define NC_IMPLINK	"implink"
+#define NC_PUP		"pup"
+#define NC_CHAOS	"chaos"
+#define NC_NS		"ns"
+#define NC_NBS		"nbs"
+#define NC_ECMA		"ecma"
+#define NC_DATAKIT	"datakit"
+#define NC_CCITT	"ccitt"
+#define NC_SNA		"sna"
+#define NC_DECNET	"decnet"
+#define NC_DLI		"dli"
+#define NC_LAT		"lat"
+#define NC_HYLINK	"hylink"
+#define NC_APPLETALK	"appletalk"
+#define NC_NIT		"nit"
+#define NC_IEEE802	"ieee802"
+#define NC_OSI		"osi"
+#define NC_X25		"x25"
+#define NC_OSINET	"osinet"
+#define NC_GOSIP	"gosip"
+
+/*
+ * nc_proto values
+ */
+#define NC_NOPROTO	"-"
+#define NC_TCP		"tcp"
+#define NC_UDP		"udp"
+#define NC_ICMP		"icmp"
+
+__BEGIN_DECLS
+void *setnetconfig(void);
+struct netconfig *getnetconfig(void *);
+struct netconfig *getnetconfigent(const char *);
+void freenetconfigent(struct netconfig *);
+int endnetconfig(void *);
+
+#ifndef _KERNEL
+void *setnetpath(void);
+struct netconfig *getnetpath(void *);
+int endnetpath(void *);
+
+void nc_perror(const char *);
+char *nc_sperror(void);
+#endif
+
+__END_DECLS
+
+#endif /* _NETCONFIG_H_ */