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, 490 insertions, 0 deletions

diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
new file mode 100644
index 000000000000..bb2d99f33315
--- /dev/null
+++ b/net/sunrpc/svc.c
@@ -0,0 +1,490 @@
+/*
+ * linux/net/sunrpc/svc.c
+ *
+ * High-level RPC service routines
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/linkage.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/mm.h>
+
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/clnt.h>
+
+#define RPCDBG_FACILITY	RPCDBG_SVCDSP
+#define RPC_PARANOIA 1
+
+/*
+ * Create an RPC service
+ */
+struct svc_serv *
+svc_create(struct svc_program *prog, unsigned int bufsize)
+{
+	struct svc_serv	*serv;
+	int vers;
+	unsigned int xdrsize;
+
+	if (!(serv = (struct svc_serv *) kmalloc(sizeof(*serv), GFP_KERNEL)))
+		return NULL;
+	memset(serv, 0, sizeof(*serv));
+	serv->sv_program   = prog;
+	serv->sv_nrthreads = 1;
+	serv->sv_stats     = prog->pg_stats;
+	serv->sv_bufsz	   = bufsize? bufsize : 4096;
+	prog->pg_lovers = prog->pg_nvers-1;
+	xdrsize = 0;
+	for (vers=0; vers<prog->pg_nvers ; vers++)
+		if (prog->pg_vers[vers]) {
+			prog->pg_hivers = vers;
+			if (prog->pg_lovers > vers)
+				prog->pg_lovers = vers;
+			if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
+				xdrsize = prog->pg_vers[vers]->vs_xdrsize;
+		}
+	serv->sv_xdrsize   = xdrsize;
+	INIT_LIST_HEAD(&serv->sv_threads);
+	INIT_LIST_HEAD(&serv->sv_sockets);
+	INIT_LIST_HEAD(&serv->sv_tempsocks);
+	INIT_LIST_HEAD(&serv->sv_permsocks);
+	spin_lock_init(&serv->sv_lock);
+
+	serv->sv_name      = prog->pg_name;
+
+	/* Remove any stale portmap registrations */
+	svc_register(serv, 0, 0);
+
+	return serv;
+}
+
+/*
+ * Destroy an RPC service
+ */
+void
+svc_destroy(struct svc_serv *serv)
+{
+	struct svc_sock	*svsk;
+
+	dprintk("RPC: svc_destroy(%s, %d)\n",
+				serv->sv_program->pg_name,
+				serv->sv_nrthreads);
+
+	if (serv->sv_nrthreads) {
+		if (--(serv->sv_nrthreads) != 0) {
+			svc_sock_update_bufs(serv);
+			return;
+		}
+	} else
+		printk("svc_destroy: no threads for serv=%p!\n", serv);
+
+	while (!list_empty(&serv->sv_tempsocks)) {
+		svsk = list_entry(serv->sv_tempsocks.next,
+				  struct svc_sock,
+				  sk_list);
+		svc_delete_socket(svsk);
+	}
+	while (!list_empty(&serv->sv_permsocks)) {
+		svsk = list_entry(serv->sv_permsocks.next,
+				  struct svc_sock,
+				  sk_list);
+		svc_delete_socket(svsk);
+	}
+	
+	cache_clean_deferred(serv);
+
+	/* Unregister service with the portmapper */
+	svc_register(serv, 0, 0);
+	kfree(serv);
+}
+
+/*
+ * Allocate an RPC server's buffer space.
+ * We allocate pages and place them in rq_argpages.
+ */
+static int
+svc_init_buffer(struct svc_rqst *rqstp, unsigned int size)
+{
+	int pages;
+	int arghi;
+	
+	if (size > RPCSVC_MAXPAYLOAD)
+		size = RPCSVC_MAXPAYLOAD;
+	pages = 2 + (size+ PAGE_SIZE -1) / PAGE_SIZE;
+	rqstp->rq_argused = 0;
+	rqstp->rq_resused = 0;
+	arghi = 0;
+	if (pages > RPCSVC_MAXPAGES)
+		BUG();
+	while (pages) {
+		struct page *p = alloc_page(GFP_KERNEL);
+		if (!p)
+			break;
+		rqstp->rq_argpages[arghi++] = p;
+		pages--;
+	}
+	rqstp->rq_arghi = arghi;
+	return ! pages;
+}
+
+/*
+ * Release an RPC server buffer
+ */
+static void
+svc_release_buffer(struct svc_rqst *rqstp)
+{
+	while (rqstp->rq_arghi)
+		put_page(rqstp->rq_argpages[--rqstp->rq_arghi]);
+	while (rqstp->rq_resused) {
+		if (rqstp->rq_respages[--rqstp->rq_resused] == NULL)
+			continue;
+		put_page(rqstp->rq_respages[rqstp->rq_resused]);
+	}
+	rqstp->rq_argused = 0;
+}
+
+/*
+ * Create a server thread
+ */
+int
+svc_create_thread(svc_thread_fn func, struct svc_serv *serv)
+{
+	struct svc_rqst	*rqstp;
+	int		error = -ENOMEM;
+
+	rqstp = kmalloc(sizeof(*rqstp), GFP_KERNEL);
+	if (!rqstp)
+		goto out;
+
+	memset(rqstp, 0, sizeof(*rqstp));
+	init_waitqueue_head(&rqstp->rq_wait);
+
+	if (!(rqstp->rq_argp = (u32 *) kmalloc(serv->sv_xdrsize, GFP_KERNEL))
+	 || !(rqstp->rq_resp = (u32 *) kmalloc(serv->sv_xdrsize, GFP_KERNEL))
+	 || !svc_init_buffer(rqstp, serv->sv_bufsz))
+		goto out_thread;
+
+	serv->sv_nrthreads++;
+	rqstp->rq_server = serv;
+	error = kernel_thread((int (*)(void *)) func, rqstp, 0);
+	if (error < 0)
+		goto out_thread;
+	svc_sock_update_bufs(serv);
+	error = 0;
+out:
+	return error;
+
+out_thread:
+	svc_exit_thread(rqstp);
+	goto out;
+}
+
+/*
+ * Destroy an RPC server thread
+ */
+void
+svc_exit_thread(struct svc_rqst *rqstp)
+{
+	struct svc_serv	*serv = rqstp->rq_server;
+
+	svc_release_buffer(rqstp);
+	if (rqstp->rq_resp)
+		kfree(rqstp->rq_resp);
+	if (rqstp->rq_argp)
+		kfree(rqstp->rq_argp);
+	if (rqstp->rq_auth_data)
+		kfree(rqstp->rq_auth_data);
+	kfree(rqstp);
+
+	/* Release the server */
+	if (serv)
+		svc_destroy(serv);
+}
+
+/*
+ * Register an RPC service with the local portmapper.
+ * To unregister a service, call this routine with 
+ * proto and port == 0.
+ */
+int
+svc_register(struct svc_serv *serv, int proto, unsigned short port)
+{
+	struct svc_program	*progp;
+	unsigned long		flags;
+	int			i, error = 0, dummy;
+
+	progp = serv->sv_program;
+
+	dprintk("RPC: svc_register(%s, %s, %d)\n",
+		progp->pg_name, proto == IPPROTO_UDP? "udp" : "tcp", port);
+
+	if (!port)
+		clear_thread_flag(TIF_SIGPENDING);
+
+	for (i = 0; i < progp->pg_nvers; i++) {
+		if (progp->pg_vers[i] == NULL)
+			continue;
+		error = rpc_register(progp->pg_prog, i, proto, port, &dummy);
+		if (error < 0)
+			break;
+		if (port && !dummy) {
+			error = -EACCES;
+			break;
+		}
+	}
+
+	if (!port) {
+		spin_lock_irqsave(&current->sighand->siglock, flags);
+		recalc_sigpending();
+		spin_unlock_irqrestore(&current->sighand->siglock, flags);
+	}
+
+	return error;
+}
+
+/*
+ * Process the RPC request.
+ */
+int
+svc_process(struct svc_serv *serv, struct svc_rqst *rqstp)
+{
+	struct svc_program	*progp;
+	struct svc_version	*versp = NULL;	/* compiler food */
+	struct svc_procedure	*procp = NULL;
+	struct kvec *		argv = &rqstp->rq_arg.head[0];
+	struct kvec *		resv = &rqstp->rq_res.head[0];
+	kxdrproc_t		xdr;
+	u32			*statp;
+	u32			dir, prog, vers, proc,
+				auth_stat, rpc_stat;
+	int			auth_res;
+	u32			*accept_statp;
+
+	rpc_stat = rpc_success;
+
+	if (argv->iov_len < 6*4)
+		goto err_short_len;
+
+	/* setup response xdr_buf.
+	 * Initially it has just one page 
+	 */
+	svc_take_page(rqstp); /* must succeed */
+	resv->iov_base = page_address(rqstp->rq_respages[0]);
+	resv->iov_len = 0;
+	rqstp->rq_res.pages = rqstp->rq_respages+1;
+	rqstp->rq_res.len = 0;
+	rqstp->rq_res.page_base = 0;
+	rqstp->rq_res.page_len = 0;
+	rqstp->rq_res.tail[0].iov_len = 0;
+	/* tcp needs a space for the record length... */
+	if (rqstp->rq_prot == IPPROTO_TCP)
+		svc_putu32(resv, 0);
+
+	rqstp->rq_xid = svc_getu32(argv);
+	svc_putu32(resv, rqstp->rq_xid);
+
+	dir  = ntohl(svc_getu32(argv));
+	vers = ntohl(svc_getu32(argv));
+
+	/* First words of reply: */
+	svc_putu32(resv, xdr_one);		/* REPLY */
+
+	if (dir != 0)		/* direction != CALL */
+		goto err_bad_dir;
+	if (vers != 2)		/* RPC version number */
+		goto err_bad_rpc;
+
+	/* Save position in case we later decide to reject: */
+	accept_statp = resv->iov_base + resv->iov_len;
+
+	svc_putu32(resv, xdr_zero);		/* ACCEPT */
+
+	rqstp->rq_prog = prog = ntohl(svc_getu32(argv));	/* program number */
+	rqstp->rq_vers = vers = ntohl(svc_getu32(argv));	/* version number */
+	rqstp->rq_proc = proc = ntohl(svc_getu32(argv));	/* procedure number */
+
+	progp = serv->sv_program;
+	/*
+	 * Decode auth data, and add verifier to reply buffer.
+	 * We do this before anything else in order to get a decent
+	 * auth verifier.
+	 */
+	auth_res = svc_authenticate(rqstp, &auth_stat);
+	/* Also give the program a chance to reject this call: */
+	if (auth_res == SVC_OK) {
+		auth_stat = rpc_autherr_badcred;
+		auth_res = progp->pg_authenticate(rqstp);
+	}
+	switch (auth_res) {
+	case SVC_OK:
+		break;
+	case SVC_GARBAGE:
+		rpc_stat = rpc_garbage_args;
+		goto err_bad;
+	case SVC_SYSERR:
+		rpc_stat = rpc_system_err;
+		goto err_bad;
+	case SVC_DENIED:
+		goto err_bad_auth;
+	case SVC_DROP:
+		goto dropit;
+	case SVC_COMPLETE:
+		goto sendit;
+	}
+		
+	if (prog != progp->pg_prog)
+		goto err_bad_prog;
+
+	if (vers >= progp->pg_nvers ||
+	  !(versp = progp->pg_vers[vers]))
+		goto err_bad_vers;
+
+	procp = versp->vs_proc + proc;
+	if (proc >= versp->vs_nproc || !procp->pc_func)
+		goto err_bad_proc;
+	rqstp->rq_server   = serv;
+	rqstp->rq_procinfo = procp;
+
+	/* Syntactic check complete */
+	serv->sv_stats->rpccnt++;
+
+	/* Build the reply header. */
+	statp = resv->iov_base +resv->iov_len;
+	svc_putu32(resv, rpc_success);		/* RPC_SUCCESS */
+
+	/* Bump per-procedure stats counter */
+	procp->pc_count++;
+
+	/* Initialize storage for argp and resp */
+	memset(rqstp->rq_argp, 0, procp->pc_argsize);
+	memset(rqstp->rq_resp, 0, procp->pc_ressize);
+
+	/* un-reserve some of the out-queue now that we have a 
+	 * better idea of reply size
+	 */
+	if (procp->pc_xdrressize)
+		svc_reserve(rqstp, procp->pc_xdrressize<<2);
+
+	/* Call the function that processes the request. */
+	if (!versp->vs_dispatch) {
+		/* Decode arguments */
+		xdr = procp->pc_decode;
+		if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
+			goto err_garbage;
+
+		*statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
+
+		/* Encode reply */
+		if (*statp == rpc_success && (xdr = procp->pc_encode)
+		 && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
+			dprintk("svc: failed to encode reply\n");
+			/* serv->sv_stats->rpcsystemerr++; */
+			*statp = rpc_system_err;
+		}
+	} else {
+		dprintk("svc: calling dispatcher\n");
+		if (!versp->vs_dispatch(rqstp, statp)) {
+			/* Release reply info */
+			if (procp->pc_release)
+				procp->pc_release(rqstp, NULL, rqstp->rq_resp);
+			goto dropit;
+		}
+	}
+
+	/* Check RPC status result */
+	if (*statp != rpc_success)
+		resv->iov_len = ((void*)statp)  - resv->iov_base + 4;
+
+	/* Release reply info */
+	if (procp->pc_release)
+		procp->pc_release(rqstp, NULL, rqstp->rq_resp);
+
+	if (procp->pc_encode == NULL)
+		goto dropit;
+
+ sendit:
+	if (svc_authorise(rqstp))
+		goto dropit;
+	return svc_send(rqstp);
+
+ dropit:
+	svc_authorise(rqstp);	/* doesn't hurt to call this twice */
+	dprintk("svc: svc_process dropit\n");
+	svc_drop(rqstp);
+	return 0;
+
+err_short_len:
+#ifdef RPC_PARANOIA
+	printk("svc: short len %Zd, dropping request\n", argv->iov_len);
+#endif
+	goto dropit;			/* drop request */
+
+err_bad_dir:
+#ifdef RPC_PARANOIA
+	printk("svc: bad direction %d, dropping request\n", dir);
+#endif
+	serv->sv_stats->rpcbadfmt++;
+	goto dropit;			/* drop request */
+
+err_bad_rpc:
+	serv->sv_stats->rpcbadfmt++;
+	svc_putu32(resv, xdr_one);	/* REJECT */
+	svc_putu32(resv, xdr_zero);	/* RPC_MISMATCH */
+	svc_putu32(resv, xdr_two);	/* Only RPCv2 supported */
+	svc_putu32(resv, xdr_two);
+	goto sendit;
+
+err_bad_auth:
+	dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
+	serv->sv_stats->rpcbadauth++;
+	/* Restore write pointer to location of accept status: */
+	xdr_ressize_check(rqstp, accept_statp);
+	svc_putu32(resv, xdr_one);	/* REJECT */
+	svc_putu32(resv, xdr_one);	/* AUTH_ERROR */
+	svc_putu32(resv, auth_stat);	/* status */
+	goto sendit;
+
+err_bad_prog:
+#ifdef RPC_PARANOIA
+	if (prog != 100227 || progp->pg_prog != 100003)
+		printk("svc: unknown program %d (me %d)\n", prog, progp->pg_prog);
+	/* else it is just a Solaris client seeing if ACLs are supported */
+#endif
+	serv->sv_stats->rpcbadfmt++;
+	svc_putu32(resv, rpc_prog_unavail);
+	goto sendit;
+
+err_bad_vers:
+#ifdef RPC_PARANOIA
+	printk("svc: unknown version (%d)\n", vers);
+#endif
+	serv->sv_stats->rpcbadfmt++;
+	svc_putu32(resv, rpc_prog_mismatch);
+	svc_putu32(resv, htonl(progp->pg_lovers));
+	svc_putu32(resv, htonl(progp->pg_hivers));
+	goto sendit;
+
+err_bad_proc:
+#ifdef RPC_PARANOIA
+	printk("svc: unknown procedure (%d)\n", proc);
+#endif
+	serv->sv_stats->rpcbadfmt++;
+	svc_putu32(resv, rpc_proc_unavail);
+	goto sendit;
+
+err_garbage:
+#ifdef RPC_PARANOIA
+	printk("svc: failed to decode args\n");
+#endif
+	rpc_stat = rpc_garbage_args;
+err_bad:
+	serv->sv_stats->rpcbadfmt++;
+	svc_putu32(resv, rpc_stat);
+	goto sendit;
+}