Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 306 insertions, 0 deletions

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
new file mode 100644
index 000000000000..37003970cf2e
--- /dev/null
+++ b/include/linux/sunrpc/svc.h
@@ -0,0 +1,306 @@
+/*
+ * linux/include/linux/sunrpc/svc.h
+ *
+ * RPC server declarations.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+
+#ifndef SUNRPC_SVC_H
+#define SUNRPC_SVC_H
+
+#include <linux/in.h>
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/svcauth.h>
+#include <linux/wait.h>
+#include <linux/mm.h>
+
+/*
+ * RPC service.
+ *
+ * An RPC service is a ``daemon,'' possibly multithreaded, which
+ * receives and processes incoming RPC messages.
+ * It has one or more transport sockets associated with it, and maintains
+ * a list of idle threads waiting for input.
+ *
+ * We currently do not support more than one RPC program per daemon.
+ */
+struct svc_serv {
+	struct list_head	sv_threads;	/* idle server threads */
+	struct list_head	sv_sockets;	/* pending sockets */
+	struct svc_program *	sv_program;	/* RPC program */
+	struct svc_stat *	sv_stats;	/* RPC statistics */
+	spinlock_t		sv_lock;
+	unsigned int		sv_nrthreads;	/* # of server threads */
+	unsigned int		sv_bufsz;	/* datagram buffer size */
+	unsigned int		sv_xdrsize;	/* XDR buffer size */
+
+	struct list_head	sv_permsocks;	/* all permanent sockets */
+	struct list_head	sv_tempsocks;	/* all temporary sockets */
+	int			sv_tmpcnt;	/* count of temporary sockets */
+
+	char *			sv_name;	/* service name */
+};
+
+/*
+ * Maximum payload size supported by a kernel RPC server.
+ * This is use to determine the max number of pages nfsd is
+ * willing to return in a single READ operation.
+ */
+#define RPCSVC_MAXPAYLOAD	(64*1024u)
+
+/*
+ * RPC Requsts and replies are stored in one or more pages.
+ * We maintain an array of pages for each server thread.
+ * Requests are copied into these pages as they arrive.  Remaining
+ * pages are available to write the reply into.
+ *
+ * Pages are sent using ->sendpage so each server thread needs to
+ * allocate more to replace those used in sending.  To help keep track
+ * of these pages we have a receive list where all pages initialy live,
+ * and a send list where pages are moved to when there are to be part
+ * of a reply.
+ *
+ * We use xdr_buf for holding responses as it fits well with NFS
+ * read responses (that have a header, and some data pages, and possibly
+ * a tail) and means we can share some client side routines.
+ *
+ * The xdr_buf.head kvec always points to the first page in the rq_*pages
+ * list.  The xdr_buf.pages pointer points to the second page on that
+ * list.  xdr_buf.tail points to the end of the first page.
+ * This assumes that the non-page part of an rpc reply will fit
+ * in a page - NFSd ensures this.  lockd also has no trouble.
+ *
+ * Each request/reply pair can have at most one "payload", plus two pages,
+ * one for the request, and one for the reply.
+ */
+#define RPCSVC_MAXPAGES		((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE + 2)
+
+static inline u32 svc_getu32(struct kvec *iov)
+{
+	u32 val, *vp;
+	vp = iov->iov_base;
+	val = *vp++;
+	iov->iov_base = (void*)vp;
+	iov->iov_len -= sizeof(u32);
+	return val;
+}
+
+static inline void svc_ungetu32(struct kvec *iov)
+{
+	u32 *vp = (u32 *)iov->iov_base;
+	iov->iov_base = (void *)(vp - 1);
+	iov->iov_len += sizeof(*vp);
+}
+
+static inline void svc_putu32(struct kvec *iov, u32 val)
+{
+	u32 *vp = iov->iov_base + iov->iov_len;
+	*vp = val;
+	iov->iov_len += sizeof(u32);
+}
+
+	
+/*
+ * The context of a single thread, including the request currently being
+ * processed.
+ * NOTE: First two items must be prev/next.
+ */
+struct svc_rqst {
+	struct list_head	rq_list;	/* idle list */
+	struct svc_sock *	rq_sock;	/* socket */
+	struct sockaddr_in	rq_addr;	/* peer address */
+	int			rq_addrlen;
+
+	struct svc_serv *	rq_server;	/* RPC service definition */
+	struct svc_procedure *	rq_procinfo;	/* procedure info */
+	struct auth_ops *	rq_authop;	/* authentication flavour */
+	struct svc_cred		rq_cred;	/* auth info */
+	struct sk_buff *	rq_skbuff;	/* fast recv inet buffer */
+	struct svc_deferred_req*rq_deferred;	/* deferred request we are replaying */
+
+	struct xdr_buf		rq_arg;
+	struct xdr_buf		rq_res;
+	struct page *		rq_argpages[RPCSVC_MAXPAGES];
+	struct page *		rq_respages[RPCSVC_MAXPAGES];
+	int			rq_restailpage;
+	short			rq_argused;	/* pages used for argument */
+	short			rq_arghi;	/* pages available in argument page list */
+	short			rq_resused;	/* pages used for result */
+
+	u32			rq_xid;		/* transmission id */
+	u32			rq_prog;	/* program number */
+	u32			rq_vers;	/* program version */
+	u32			rq_proc;	/* procedure number */
+	u32			rq_prot;	/* IP protocol */
+	unsigned short
+				rq_secure  : 1;	/* secure port */
+
+
+	__u32			rq_daddr;	/* dest addr of request - reply from here */
+
+	void *			rq_argp;	/* decoded arguments */
+	void *			rq_resp;	/* xdr'd results */
+	void *			rq_auth_data;	/* flavor-specific data */
+
+	int			rq_reserved;	/* space on socket outq
+						 * reserved for this request
+						 */
+
+	struct cache_req	rq_chandle;	/* handle passed to caches for 
+						 * request delaying 
+						 */
+	/* Catering to nfsd */
+	struct auth_domain *	rq_client;	/* RPC peer info */
+	struct svc_cacherep *	rq_cacherep;	/* cache info */
+	struct knfsd_fh *	rq_reffh;	/* Referrence filehandle, used to
+						 * determine what device number
+						 * to report (real or virtual)
+						 */
+
+	wait_queue_head_t	rq_wait;	/* synchronization */
+};
+
+/*
+ * Check buffer bounds after decoding arguments
+ */
+static inline int
+xdr_argsize_check(struct svc_rqst *rqstp, u32 *p)
+{
+	char *cp = (char *)p;
+	struct kvec *vec = &rqstp->rq_arg.head[0];
+	return cp - (char*)vec->iov_base <= vec->iov_len;
+}
+
+static inline int
+xdr_ressize_check(struct svc_rqst *rqstp, u32 *p)
+{
+	struct kvec *vec = &rqstp->rq_res.head[0];
+	char *cp = (char*)p;
+
+	vec->iov_len = cp - (char*)vec->iov_base;
+
+	return vec->iov_len <= PAGE_SIZE;
+}
+
+static inline int svc_take_page(struct svc_rqst *rqstp)
+{
+	if (rqstp->rq_arghi <= rqstp->rq_argused)
+		return -ENOMEM;
+	rqstp->rq_arghi--;
+	rqstp->rq_respages[rqstp->rq_resused] =
+		rqstp->rq_argpages[rqstp->rq_arghi];
+	rqstp->rq_resused++;
+	return 0;
+}
+
+static inline void svc_pushback_allpages(struct svc_rqst *rqstp)
+{
+        while (rqstp->rq_resused) {
+		if (rqstp->rq_respages[--rqstp->rq_resused] == NULL)
+			continue;
+		rqstp->rq_argpages[rqstp->rq_arghi++] =
+			rqstp->rq_respages[rqstp->rq_resused];
+		rqstp->rq_respages[rqstp->rq_resused] = NULL;
+	}
+}
+
+static inline void svc_pushback_unused_pages(struct svc_rqst *rqstp)
+{
+	while (rqstp->rq_resused &&
+	       rqstp->rq_res.pages != &rqstp->rq_respages[rqstp->rq_resused]) {
+
+		if (rqstp->rq_respages[--rqstp->rq_resused] != NULL) {
+			rqstp->rq_argpages[rqstp->rq_arghi++] =
+				rqstp->rq_respages[rqstp->rq_resused];
+			rqstp->rq_respages[rqstp->rq_resused] = NULL;
+		}
+	}
+}
+
+static inline void svc_free_allpages(struct svc_rqst *rqstp)
+{
+        while (rqstp->rq_resused) {
+		if (rqstp->rq_respages[--rqstp->rq_resused] == NULL)
+			continue;
+		put_page(rqstp->rq_respages[rqstp->rq_resused]);
+		rqstp->rq_respages[rqstp->rq_resused] = NULL;
+	}
+}
+
+struct svc_deferred_req {
+	u32			prot;	/* protocol (UDP or TCP) */
+	struct sockaddr_in	addr;
+	struct svc_sock		*svsk;	/* where reply must go */
+	struct cache_deferred_req handle;
+	int			argslen;
+	u32			args[0];
+};
+
+/*
+ * RPC program
+ */
+struct svc_program {
+	u32			pg_prog;	/* program number */
+	unsigned int		pg_lovers;	/* lowest version */
+	unsigned int		pg_hivers;	/* lowest version */
+	unsigned int		pg_nvers;	/* number of versions */
+	struct svc_version **	pg_vers;	/* version array */
+	char *			pg_name;	/* service name */
+	char *			pg_class;	/* class name: services sharing authentication */
+	struct svc_stat *	pg_stats;	/* rpc statistics */
+	int			(*pg_authenticate)(struct svc_rqst *);
+};
+
+/*
+ * RPC program version
+ */
+struct svc_version {
+	u32			vs_vers;	/* version number */
+	u32			vs_nproc;	/* number of procedures */
+	struct svc_procedure *	vs_proc;	/* per-procedure info */
+	u32			vs_xdrsize;	/* xdrsize needed for this version */
+
+	/* Override dispatch function (e.g. when caching replies).
+	 * A return value of 0 means drop the request. 
+	 * vs_dispatch == NULL means use default dispatcher.
+	 */
+	int			(*vs_dispatch)(struct svc_rqst *, u32 *);
+};
+
+/*
+ * RPC procedure info
+ */
+typedef int	(*svc_procfunc)(struct svc_rqst *, void *argp, void *resp);
+struct svc_procedure {
+	svc_procfunc		pc_func;	/* process the request */
+	kxdrproc_t		pc_decode;	/* XDR decode args */
+	kxdrproc_t		pc_encode;	/* XDR encode result */
+	kxdrproc_t		pc_release;	/* XDR free result */
+	unsigned int		pc_argsize;	/* argument struct size */
+	unsigned int		pc_ressize;	/* result struct size */
+	unsigned int		pc_count;	/* call count */
+	unsigned int		pc_cachetype;	/* cache info (NFS) */
+	unsigned int		pc_xdrressize;	/* maximum size of XDR reply */
+};
+
+/*
+ * This is the RPC server thread function prototype
+ */
+typedef void		(*svc_thread_fn)(struct svc_rqst *);
+
+/*
+ * Function prototypes.
+ */
+struct svc_serv *  svc_create(struct svc_program *, unsigned int);
+int		   svc_create_thread(svc_thread_fn, struct svc_serv *);
+void		   svc_exit_thread(struct svc_rqst *);
+void		   svc_destroy(struct svc_serv *);
+int		   svc_process(struct svc_serv *, struct svc_rqst *);
+int		   svc_register(struct svc_serv *, int, unsigned short);
+void		   svc_wake_up(struct svc_serv *);
+void		   svc_reserve(struct svc_rqst *rqstp, int space);
+
+#endif /* SUNRPC_SVC_H */