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, 1085 insertions, 0 deletions

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
new file mode 100644
index 000000000000..02bc029d46fe
--- /dev/null
+++ b/net/sunrpc/clnt.c
@@ -0,0 +1,1085 @@
+/*
+ *  linux/net/sunrpc/rpcclnt.c
+ *
+ *  This file contains the high-level RPC interface.
+ *  It is modeled as a finite state machine to support both synchronous
+ *  and asynchronous requests.
+ *
+ *  -   RPC header generation and argument serialization.
+ *  -   Credential refresh.
+ *  -   TCP connect handling.
+ *  -   Retry of operation when it is suspected the operation failed because
+ *      of uid squashing on the server, or when the credentials were stale
+ *      and need to be refreshed, or when a packet was damaged in transit.
+ *      This may be have to be moved to the VFS layer.
+ *
+ *  NB: BSD uses a more intelligent approach to guessing when a request
+ *  or reply has been lost by keeping the RTO estimate for each procedure.
+ *  We currently make do with a constant timeout value.
+ *
+ *  Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
+ *  Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <asm/system.h>
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/in.h>
+#include <linux/utsname.h>
+
+#include <linux/sunrpc/clnt.h>
+#include <linux/workqueue.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+
+#include <linux/nfs.h>
+
+
+#define RPC_SLACK_SPACE         (1024)  /* total overkill */
+
+#ifdef RPC_DEBUG
+# define RPCDBG_FACILITY        RPCDBG_CALL
+#endif
+
+static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
+
+
+static void     call_start(struct rpc_task *task);
+static void     call_reserve(struct rpc_task *task);
+static void     call_reserveresult(struct rpc_task *task);
+static void     call_allocate(struct rpc_task *task);
+static void     call_encode(struct rpc_task *task);
+static void     call_decode(struct rpc_task *task);
+static void     call_bind(struct rpc_task *task);
+static void     call_transmit(struct rpc_task *task);
+static void     call_status(struct rpc_task *task);
+static void     call_refresh(struct rpc_task *task);
+static void     call_refreshresult(struct rpc_task *task);
+static void     call_timeout(struct rpc_task *task);
+static void     call_connect(struct rpc_task *task);
+static void     call_connect_status(struct rpc_task *task);
+static u32 *    call_header(struct rpc_task *task);
+static u32 *    call_verify(struct rpc_task *task);
+
+
+static int
+rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
+{
+        static uint32_t clntid;
+        int error;
+
+        if (dir_name == NULL)
+                return 0;
+        for (;;) {
+                snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname),
+                                "%s/clnt%x", dir_name,
+                                (unsigned int)clntid++);
+                clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0';
+                clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt);
+                if (!IS_ERR(clnt->cl_dentry))
+                        return 0;
+                error = PTR_ERR(clnt->cl_dentry);
+                if (error != -EEXIST) {
+                        printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n",
+                                        clnt->cl_pathname, error);
+                        return error;
+                }
+        }
+}
+
+/*
+ * Create an RPC client
+ * FIXME: This should also take a flags argument (as in task->tk_flags).
+ * It's called (among others) from pmap_create_client, which may in
+ * turn be called by an async task. In this case, rpciod should not be
+ * made to sleep too long.
+ */
+struct rpc_clnt *
+rpc_create_client(struct rpc_xprt *xprt, char *servname,
+                  struct rpc_program *program, u32 vers,
+                  rpc_authflavor_t flavor)
+{
+        struct rpc_version      *version;
+        struct rpc_clnt         *clnt = NULL;
+        int err;
+        int len;
+
+        dprintk("RPC: creating %s client for %s (xprt %p)\n",
+                program->name, servname, xprt);
+
+        err = -EINVAL;
+        if (!xprt)
+                goto out_err;
+        if (vers >= program->nrvers || !(version = program->version[vers]))
+                goto out_err;
+
+        err = -ENOMEM;
+        clnt = (struct rpc_clnt *) kmalloc(sizeof(*clnt), GFP_KERNEL);
+        if (!clnt)
+                goto out_err;
+        memset(clnt, 0, sizeof(*clnt));
+        atomic_set(&clnt->cl_users, 0);
+        atomic_set(&clnt->cl_count, 1);
+        clnt->cl_parent = clnt;
+
+        clnt->cl_server = clnt->cl_inline_name;
+        len = strlen(servname) + 1;
+        if (len > sizeof(clnt->cl_inline_name)) {
+                char *buf = kmalloc(len, GFP_KERNEL);
+                if (buf != 0)
+                        clnt->cl_server = buf;
+                else
+                        len = sizeof(clnt->cl_inline_name);
+        }
+        strlcpy(clnt->cl_server, servname, len);
+
+        clnt->cl_xprt     = xprt;
+        clnt->cl_procinfo = version->procs;
+        clnt->cl_maxproc  = version->nrprocs;
+        clnt->cl_protname = program->name;
+        clnt->cl_pmap     = &clnt->cl_pmap_default;
+        clnt->cl_port     = xprt->addr.sin_port;
+        clnt->cl_prog     = program->number;
+        clnt->cl_vers     = version->number;
+        clnt->cl_prot     = xprt->prot;
+        clnt->cl_stats    = program->stats;
+        rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait");
+
+        if (!clnt->cl_port)
+                clnt->cl_autobind = 1;
+
+        clnt->cl_rtt = &clnt->cl_rtt_default;
+        rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval);
+
+        err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
+        if (err < 0)
+                goto out_no_path;
+
+        err = -ENOMEM;
+        if (!rpcauth_create(flavor, clnt)) {
+                printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
+                                flavor);
+                goto out_no_auth;
+        }
+
+        /* save the nodename */
+        clnt->cl_nodelen = strlen(system_utsname.nodename);
+        if (clnt->cl_nodelen > UNX_MAXNODENAME)
+                clnt->cl_nodelen = UNX_MAXNODENAME;
+        memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen);
+        return clnt;
+
+out_no_auth:
+        rpc_rmdir(clnt->cl_pathname);
+out_no_path:
+        if (clnt->cl_server != clnt->cl_inline_name)
+                kfree(clnt->cl_server);
+        kfree(clnt);
+out_err:
+        return ERR_PTR(err);
+}
+
+/*
+ * This function clones the RPC client structure. It allows us to share the
+ * same transport while varying parameters such as the authentication
+ * flavour.
+ */
+struct rpc_clnt *
+rpc_clone_client(struct rpc_clnt *clnt)
+{
+        struct rpc_clnt *new;
+
+        new = (struct rpc_clnt *)kmalloc(sizeof(*new), GFP_KERNEL);
+        if (!new)
+                goto out_no_clnt;
+        memcpy(new, clnt, sizeof(*new));
+        atomic_set(&new->cl_count, 1);
+        atomic_set(&new->cl_users, 0);
+        new->cl_parent = clnt;
+        atomic_inc(&clnt->cl_count);
+        /* Duplicate portmapper */
+        rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait");
+        /* Turn off autobind on clones */
+        new->cl_autobind = 0;
+        new->cl_oneshot = 0;
+        new->cl_dead = 0;
+        rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval);
+        if (new->cl_auth)
+                atomic_inc(&new->cl_auth->au_count);
+        return new;
+out_no_clnt:
+        printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__);
+        return ERR_PTR(-ENOMEM);
+}
+
+/*
+ * Properly shut down an RPC client, terminating all outstanding
+ * requests. Note that we must be certain that cl_oneshot and
+ * cl_dead are cleared, or else the client would be destroyed
+ * when the last task releases it.
+ */
+int
+rpc_shutdown_client(struct rpc_clnt *clnt)
+{
+        dprintk("RPC: shutting down %s client for %s, tasks=%d\n",
+                        clnt->cl_protname, clnt->cl_server,
+                        atomic_read(&clnt->cl_users));
+
+        while (atomic_read(&clnt->cl_users) > 0) {
+                /* Don't let rpc_release_client destroy us */
+                clnt->cl_oneshot = 0;
+                clnt->cl_dead = 0;
+                rpc_killall_tasks(clnt);
+                sleep_on_timeout(&destroy_wait, 1*HZ);
+        }
+
+        if (atomic_read(&clnt->cl_users) < 0) {
+                printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n",
+                                clnt, atomic_read(&clnt->cl_users));
+#ifdef RPC_DEBUG
+                rpc_show_tasks();
+#endif
+                BUG();
+        }
+
+        return rpc_destroy_client(clnt);
+}
+
+/*
+ * Delete an RPC client
+ */
+int
+rpc_destroy_client(struct rpc_clnt *clnt)
+{
+        if (!atomic_dec_and_test(&clnt->cl_count))
+                return 1;
+        BUG_ON(atomic_read(&clnt->cl_users) != 0);
+
+        dprintk("RPC: destroying %s client for %s\n",
+                        clnt->cl_protname, clnt->cl_server);
+        if (clnt->cl_auth) {
+                rpcauth_destroy(clnt->cl_auth);
+                clnt->cl_auth = NULL;
+        }
+        if (clnt->cl_parent != clnt) {
+                rpc_destroy_client(clnt->cl_parent);
+                goto out_free;
+        }
+        if (clnt->cl_pathname[0])
+                rpc_rmdir(clnt->cl_pathname);
+        if (clnt->cl_xprt) {
+                xprt_destroy(clnt->cl_xprt);
+                clnt->cl_xprt = NULL;
+        }
+        if (clnt->cl_server != clnt->cl_inline_name)
+                kfree(clnt->cl_server);
+out_free:
+        kfree(clnt);
+        return 0;
+}
+
+/*
+ * Release an RPC client
+ */
+void
+rpc_release_client(struct rpc_clnt *clnt)
+{
+        dprintk("RPC:      rpc_release_client(%p, %d)\n",
+                                clnt, atomic_read(&clnt->cl_users));
+
+        if (!atomic_dec_and_test(&clnt->cl_users))
+                return;
+        wake_up(&destroy_wait);
+        if (clnt->cl_oneshot || clnt->cl_dead)
+                rpc_destroy_client(clnt);
+}
+
+/*
+ * Default callback for async RPC calls
+ */
+static void
+rpc_default_callback(struct rpc_task *task)
+{
+}
+
+/*
+ *      Export the signal mask handling for aysnchronous code that
+ *      sleeps on RPC calls
+ */
+ 
+void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset)
+{
+        unsigned long   sigallow = sigmask(SIGKILL);
+        unsigned long   irqflags;
+        
+        /* Turn off various signals */
+        if (clnt->cl_intr) {
+                struct k_sigaction *action = current->sighand->action;
+                if (action[SIGINT-1].sa.sa_handler == SIG_DFL)
+                        sigallow |= sigmask(SIGINT);
+                if (action[SIGQUIT-1].sa.sa_handler == SIG_DFL)
+                        sigallow |= sigmask(SIGQUIT);
+        }
+        spin_lock_irqsave(&current->sighand->siglock, irqflags);
+        *oldset = current->blocked;
+        siginitsetinv(&current->blocked, sigallow & ~oldset->sig[0]);
+        recalc_sigpending();
+        spin_unlock_irqrestore(&current->sighand->siglock, irqflags);
+}
+
+void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset)
+{
+        unsigned long   irqflags;
+        
+        spin_lock_irqsave(&current->sighand->siglock, irqflags);
+        current->blocked = *oldset;
+        recalc_sigpending();
+        spin_unlock_irqrestore(&current->sighand->siglock, irqflags);
+}
+
+/*
+ * New rpc_call implementation
+ */
+int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
+{
+        struct rpc_task *task;
+        sigset_t        oldset;
+        int             status;
+
+        /* If this client is slain all further I/O fails */
+        if (clnt->cl_dead) 
+                return -EIO;
+
+        BUG_ON(flags & RPC_TASK_ASYNC);
+
+        rpc_clnt_sigmask(clnt, &oldset);                
+
+        status = -ENOMEM;
+        task = rpc_new_task(clnt, NULL, flags);
+        if (task == NULL)
+                goto out;
+
+        rpc_call_setup(task, msg, 0);
+
+        /* Set up the call info struct and execute the task */
+        if (task->tk_status == 0)
+                status = rpc_execute(task);
+        else {
+                status = task->tk_status;
+                rpc_release_task(task);
+        }
+
+out:
+        rpc_clnt_sigunmask(clnt, &oldset);              
+
+        return status;
+}
+
+/*
+ * New rpc_call implementation
+ */
+int
+rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
+               rpc_action callback, void *data)
+{
+        struct rpc_task *task;
+        sigset_t        oldset;
+        int             status;
+
+        /* If this client is slain all further I/O fails */
+        if (clnt->cl_dead) 
+                return -EIO;
+
+        flags |= RPC_TASK_ASYNC;
+
+        rpc_clnt_sigmask(clnt, &oldset);                
+
+        /* Create/initialize a new RPC task */
+        if (!callback)
+                callback = rpc_default_callback;
+        status = -ENOMEM;
+        if (!(task = rpc_new_task(clnt, callback, flags)))
+                goto out;
+        task->tk_calldata = data;
+
+        rpc_call_setup(task, msg, 0);
+
+        /* Set up the call info struct and execute the task */
+        status = task->tk_status;
+        if (status == 0)
+                rpc_execute(task);
+        else
+                rpc_release_task(task);
+
+out:
+        rpc_clnt_sigunmask(clnt, &oldset);              
+
+        return status;
+}
+
+
+void
+rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags)
+{
+        task->tk_msg   = *msg;
+        task->tk_flags |= flags;
+        /* Bind the user cred */
+        if (task->tk_msg.rpc_cred != NULL)
+                rpcauth_holdcred(task);
+        else
+                rpcauth_bindcred(task);
+
+        if (task->tk_status == 0)
+                task->tk_action = call_start;
+        else
+                task->tk_action = NULL;
+}
+
+void
+rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
+{
+        struct rpc_xprt *xprt = clnt->cl_xprt;
+
+        xprt->sndsize = 0;
+        if (sndsize)
+                xprt->sndsize = sndsize + RPC_SLACK_SPACE;
+        xprt->rcvsize = 0;
+        if (rcvsize)
+                xprt->rcvsize = rcvsize + RPC_SLACK_SPACE;
+        if (xprt_connected(xprt))
+                xprt_sock_setbufsize(xprt);
+}
+
+/*
+ * Return size of largest payload RPC client can support, in bytes
+ *
+ * For stream transports, this is one RPC record fragment (see RFC
+ * 1831), as we don't support multi-record requests yet.  For datagram
+ * transports, this is the size of an IP packet minus the IP, UDP, and
+ * RPC header sizes.
+ */
+size_t rpc_max_payload(struct rpc_clnt *clnt)
+{
+        return clnt->cl_xprt->max_payload;
+}
+EXPORT_SYMBOL(rpc_max_payload);
+
+/*
+ * Restart an (async) RPC call. Usually called from within the
+ * exit handler.
+ */
+void
+rpc_restart_call(struct rpc_task *task)
+{
+        if (RPC_ASSASSINATED(task))
+                return;
+
+        task->tk_action = call_start;
+}
+
+/*
+ * 0.  Initial state
+ *
+ *     Other FSM states can be visited zero or more times, but
+ *     this state is visited exactly once for each RPC.
+ */
+static void
+call_start(struct rpc_task *task)
+{
+        struct rpc_clnt *clnt = task->tk_client;
+
+        dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid,
+                clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc->p_proc,
+                (RPC_IS_ASYNC(task) ? "async" : "sync"));
+
+        /* Increment call count */
+        task->tk_msg.rpc_proc->p_count++;
+        clnt->cl_stats->rpccnt++;
+        task->tk_action = call_reserve;
+}
+
+/*
+ * 1.   Reserve an RPC call slot
+ */
+static void
+call_reserve(struct rpc_task *task)
+{
+        dprintk("RPC: %4d call_reserve\n", task->tk_pid);
+
+        if (!rpcauth_uptodatecred(task)) {
+                task->tk_action = call_refresh;
+                return;
+        }
+
+        task->tk_status  = 0;
+        task->tk_action  = call_reserveresult;
+        xprt_reserve(task);
+}
+
+/*
+ * 1b.  Grok the result of xprt_reserve()
+ */
+static void
+call_reserveresult(struct rpc_task *task)
+{
+        int status = task->tk_status;
+
+        dprintk("RPC: %4d call_reserveresult (status %d)\n",
+                                task->tk_pid, task->tk_status);
+
+        /*
+         * After a call to xprt_reserve(), we must have either
+         * a request slot or else an error status.
+         */
+        task->tk_status = 0;
+        if (status >= 0) {
+                if (task->tk_rqstp) {
+                        task->tk_action = call_allocate;
+                        return;
+                }
+
+                printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
+                                __FUNCTION__, status);
+                rpc_exit(task, -EIO);
+                return;
+        }
+
+        /*
+         * Even though there was an error, we may have acquired
+         * a request slot somehow.  Make sure not to leak it.
+         */
+        if (task->tk_rqstp) {
+                printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
+                                __FUNCTION__, status);
+                xprt_release(task);
+        }
+
+        switch (status) {
+        case -EAGAIN:   /* woken up; retry */
+                task->tk_action = call_reserve;
+                return;
+        case -EIO:      /* probably a shutdown */
+                break;
+        default:
+                printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
+                                __FUNCTION__, status);
+                break;
+        }
+        rpc_exit(task, status);
+}
+
+/*
+ * 2.   Allocate the buffer. For details, see sched.c:rpc_malloc.
+ *      (Note: buffer memory is freed in rpc_task_release).
+ */
+static void
+call_allocate(struct rpc_task *task)
+{
+        unsigned int    bufsiz;
+
+        dprintk("RPC: %4d call_allocate (status %d)\n", 
+                                task->tk_pid, task->tk_status);
+        task->tk_action = call_bind;
+        if (task->tk_buffer)
+                return;
+
+        /* FIXME: compute buffer requirements more exactly using
+         * auth->au_wslack */
+        bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE;
+
+        if (rpc_malloc(task, bufsiz << 1) != NULL)
+                return;
+        printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task); 
+
+        if (RPC_IS_ASYNC(task) || !(task->tk_client->cl_intr && signalled())) {
+                xprt_release(task);
+                task->tk_action = call_reserve;
+                rpc_delay(task, HZ>>4);
+                return;
+        }
+
+        rpc_exit(task, -ERESTARTSYS);
+}
+
+/*
+ * 3.   Encode arguments of an RPC call
+ */
+static void
+call_encode(struct rpc_task *task)
+{
+        struct rpc_clnt *clnt = task->tk_client;
+        struct rpc_rqst *req = task->tk_rqstp;
+        struct xdr_buf *sndbuf = &req->rq_snd_buf;
+        struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
+        unsigned int    bufsiz;
+        kxdrproc_t      encode;
+        int             status;
+        u32             *p;
+
+        dprintk("RPC: %4d call_encode (status %d)\n", 
+                                task->tk_pid, task->tk_status);
+
+        /* Default buffer setup */
+        bufsiz = task->tk_bufsize >> 1;
+        sndbuf->head[0].iov_base = (void *)task->tk_buffer;
+        sndbuf->head[0].iov_len  = bufsiz;
+        sndbuf->tail[0].iov_len  = 0;
+        sndbuf->page_len         = 0;
+        sndbuf->len              = 0;
+        sndbuf->buflen           = bufsiz;
+        rcvbuf->head[0].iov_base = (void *)((char *)task->tk_buffer + bufsiz);
+        rcvbuf->head[0].iov_len  = bufsiz;
+        rcvbuf->tail[0].iov_len  = 0;
+        rcvbuf->page_len         = 0;
+        rcvbuf->len              = 0;
+        rcvbuf->buflen           = bufsiz;
+
+        /* Encode header and provided arguments */
+        encode = task->tk_msg.rpc_proc->p_encode;
+        if (!(p = call_header(task))) {
+                printk(KERN_INFO "RPC: call_header failed, exit EIO\n");
+                rpc_exit(task, -EIO);
+                return;
+        }
+        if (encode && (status = rpcauth_wrap_req(task, encode, req, p,
+                                                 task->tk_msg.rpc_argp)) < 0) {
+                printk(KERN_WARNING "%s: can't encode arguments: %d\n",
+                                clnt->cl_protname, -status);
+                rpc_exit(task, status);
+        }
+}
+
+/*
+ * 4.   Get the server port number if not yet set
+ */
+static void
+call_bind(struct rpc_task *task)
+{
+        struct rpc_clnt *clnt = task->tk_client;
+        struct rpc_xprt *xprt = clnt->cl_xprt;
+
+        dprintk("RPC: %4d call_bind xprt %p %s connected\n", task->tk_pid,
+                        xprt, (xprt_connected(xprt) ? "is" : "is not"));
+
+        task->tk_action = (xprt_connected(xprt)) ? call_transmit : call_connect;
+
+        if (!clnt->cl_port) {
+                task->tk_action = call_connect;
+                task->tk_timeout = RPC_CONNECT_TIMEOUT;
+                rpc_getport(task, clnt);
+        }
+}
+
+/*
+ * 4a.  Connect to the RPC server (TCP case)
+ */
+static void
+call_connect(struct rpc_task *task)
+{
+        struct rpc_clnt *clnt = task->tk_client;
+
+        dprintk("RPC: %4d call_connect status %d\n",
+                                task->tk_pid, task->tk_status);
+
+        if (xprt_connected(clnt->cl_xprt)) {
+                task->tk_action = call_transmit;
+                return;
+        }
+        task->tk_action = call_connect_status;
+        if (task->tk_status < 0)
+                return;
+        xprt_connect(task);
+}
+
+/*
+ * 4b. Sort out connect result
+ */
+static void
+call_connect_status(struct rpc_task *task)
+{
+        struct rpc_clnt *clnt = task->tk_client;
+        int status = task->tk_status;
+
+        task->tk_status = 0;
+        if (status >= 0) {
+                clnt->cl_stats->netreconn++;
+                task->tk_action = call_transmit;
+                return;
+        }
+
+        /* Something failed: we may have to rebind */
+        if (clnt->cl_autobind)
+                clnt->cl_port = 0;
+        switch (status) {
+        case -ENOTCONN:
+        case -ETIMEDOUT:
+        case -EAGAIN:
+                task->tk_action = (clnt->cl_port == 0) ? call_bind : call_connect;
+                break;
+        default:
+                rpc_exit(task, -EIO);
+        }
+}
+
+/*
+ * 5.   Transmit the RPC request, and wait for reply
+ */
+static void
+call_transmit(struct rpc_task *task)
+{
+        dprintk("RPC: %4d call_transmit (status %d)\n", 
+                                task->tk_pid, task->tk_status);
+
+        task->tk_action = call_status;
+        if (task->tk_status < 0)
+                return;
+        task->tk_status = xprt_prepare_transmit(task);
+        if (task->tk_status != 0)
+                return;
+        /* Encode here so that rpcsec_gss can use correct sequence number. */
+        if (!task->tk_rqstp->rq_bytes_sent)
+                call_encode(task);
+        if (task->tk_status < 0)
+                return;
+        xprt_transmit(task);
+        if (task->tk_status < 0)
+                return;
+        if (!task->tk_msg.rpc_proc->p_decode) {
+                task->tk_action = NULL;
+                rpc_wake_up_task(task);
+        }
+}
+
+/*
+ * 6.   Sort out the RPC call status
+ */
+static void
+call_status(struct rpc_task *task)
+{
+        struct rpc_clnt *clnt = task->tk_client;
+        struct rpc_rqst *req = task->tk_rqstp;
+        int             status;
+
+        if (req->rq_received > 0 && !req->rq_bytes_sent)
+                task->tk_status = req->rq_received;
+
+        dprintk("RPC: %4d call_status (status %d)\n", 
+                                task->tk_pid, task->tk_status);
+
+        status = task->tk_status;
+        if (status >= 0) {
+                task->tk_action = call_decode;
+                return;
+        }
+
+        task->tk_status = 0;
+        switch(status) {
+        case -ETIMEDOUT:
+                task->tk_action = call_timeout;
+                break;
+        case -ECONNREFUSED:
+        case -ENOTCONN:
+                req->rq_bytes_sent = 0;
+                if (clnt->cl_autobind)
+                        clnt->cl_port = 0;
+                task->tk_action = call_bind;
+                break;
+        case -EAGAIN:
+                task->tk_action = call_transmit;
+                break;
+        case -EIO:
+                /* shutdown or soft timeout */
+                rpc_exit(task, status);
+                break;
+        default:
+                if (clnt->cl_chatty)
+                        printk("%s: RPC call returned error %d\n",
+                               clnt->cl_protname, -status);
+                rpc_exit(task, status);
+                break;
+        }
+}
+
+/*
+ * 6a.  Handle RPC timeout
+ *      We do not release the request slot, so we keep using the
+ *      same XID for all retransmits.
+ */
+static void
+call_timeout(struct rpc_task *task)
+{
+        struct rpc_clnt *clnt = task->tk_client;
+
+        if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
+                dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid);
+                goto retry;
+        }
+
+        dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid);
+        if (RPC_IS_SOFT(task)) {
+                if (clnt->cl_chatty)
+                        printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
+                                clnt->cl_protname, clnt->cl_server);
+                rpc_exit(task, -EIO);
+                return;
+        }
+
+        if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) {
+                task->tk_flags |= RPC_CALL_MAJORSEEN;
+                printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
+                        clnt->cl_protname, clnt->cl_server);
+        }
+        if (clnt->cl_autobind)
+                clnt->cl_port = 0;
+
+retry:
+        clnt->cl_stats->rpcretrans++;
+        task->tk_action = call_bind;
+        task->tk_status = 0;
+}
+
+/*
+ * 7.   Decode the RPC reply
+ */
+static void
+call_decode(struct rpc_task *task)
+{
+        struct rpc_clnt *clnt = task->tk_client;
+        struct rpc_rqst *req = task->tk_rqstp;
+        kxdrproc_t      decode = task->tk_msg.rpc_proc->p_decode;
+        u32             *p;
+
+        dprintk("RPC: %4d call_decode (status %d)\n", 
+                                task->tk_pid, task->tk_status);
+
+        if (clnt->cl_chatty && (task->tk_flags & RPC_CALL_MAJORSEEN)) {
+                printk(KERN_NOTICE "%s: server %s OK\n",
+                        clnt->cl_protname, clnt->cl_server);
+                task->tk_flags &= ~RPC_CALL_MAJORSEEN;
+        }
+
+        if (task->tk_status < 12) {
+                if (!RPC_IS_SOFT(task)) {
+                        task->tk_action = call_bind;
+                        clnt->cl_stats->rpcretrans++;
+                        goto out_retry;
+                }
+                printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n",
+                        clnt->cl_protname, task->tk_status);
+                rpc_exit(task, -EIO);
+                return;
+        }
+
+        req->rq_rcv_buf.len = req->rq_private_buf.len;
+
+        /* Check that the softirq receive buffer is valid */
+        WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
+                                sizeof(req->rq_rcv_buf)) != 0);
+
+        /* Verify the RPC header */
+        if (!(p = call_verify(task))) {
+                if (task->tk_action == NULL)
+                        return;
+                goto out_retry;
+        }
+
+        task->tk_action = NULL;
+
+        if (decode)
+                task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
+                                                      task->tk_msg.rpc_resp);
+        dprintk("RPC: %4d call_decode result %d\n", task->tk_pid,
+                                        task->tk_status);
+        return;
+out_retry:
+        req->rq_received = req->rq_private_buf.len = 0;
+        task->tk_status = 0;
+}
+
+/*
+ * 8.   Refresh the credentials if rejected by the server
+ */
+static void
+call_refresh(struct rpc_task *task)
+{
+        dprintk("RPC: %4d call_refresh\n", task->tk_pid);
+
+        xprt_release(task);     /* Must do to obtain new XID */
+        task->tk_action = call_refreshresult;
+        task->tk_status = 0;
+        task->tk_client->cl_stats->rpcauthrefresh++;
+        rpcauth_refreshcred(task);
+}
+
+/*
+ * 8a.  Process the results of a credential refresh
+ */
+static void
+call_refreshresult(struct rpc_task *task)
+{
+        int status = task->tk_status;
+        dprintk("RPC: %4d call_refreshresult (status %d)\n", 
+                                task->tk_pid, task->tk_status);
+
+        task->tk_status = 0;
+        task->tk_action = call_reserve;
+        if (status >= 0 && rpcauth_uptodatecred(task))
+                return;
+        if (status == -EACCES) {
+                rpc_exit(task, -EACCES);
+                return;
+        }
+        task->tk_action = call_refresh;
+        if (status != -ETIMEDOUT)
+                rpc_delay(task, 3*HZ);
+        return;
+}
+
+/*
+ * Call header serialization
+ */
+static u32 *
+call_header(struct rpc_task *task)
+{
+        struct rpc_clnt *clnt = task->tk_client;
+        struct rpc_xprt *xprt = clnt->cl_xprt;
+        struct rpc_rqst *req = task->tk_rqstp;
+        u32             *p = req->rq_svec[0].iov_base;
+
+        /* FIXME: check buffer size? */
+        if (xprt->stream)
+                *p++ = 0;               /* fill in later */
+        *p++ = req->rq_xid;             /* XID */
+        *p++ = htonl(RPC_CALL);         /* CALL */
+        *p++ = htonl(RPC_VERSION);      /* RPC version */
+        *p++ = htonl(clnt->cl_prog);    /* program number */
+        *p++ = htonl(clnt->cl_vers);    /* program version */
+        *p++ = htonl(task->tk_msg.rpc_proc->p_proc);    /* procedure */
+        return rpcauth_marshcred(task, p);
+}
+
+/*
+ * Reply header verification
+ */
+static u32 *
+call_verify(struct rpc_task *task)
+{
+        struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
+        int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
+        u32     *p = iov->iov_base, n;
+        int error = -EACCES;
+
+        if ((len -= 3) < 0)
+                goto out_overflow;
+        p += 1; /* skip XID */
+
+        if ((n = ntohl(*p++)) != RPC_REPLY) {
+                printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n);
+                goto out_retry;
+        }
+        if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
+                if (--len < 0)
+                        goto out_overflow;
+                switch ((n = ntohl(*p++))) {
+                        case RPC_AUTH_ERROR:
+                                break;
+                        case RPC_MISMATCH:
+                                printk(KERN_WARNING "%s: RPC call version mismatch!\n", __FUNCTION__);
+                                goto out_eio;
+                        default:
+                                printk(KERN_WARNING "%s: RPC call rejected, unknown error: %x\n", __FUNCTION__, n);
+                                goto out_eio;
+                }
+                if (--len < 0)
+                        goto out_overflow;
+                switch ((n = ntohl(*p++))) {
+                case RPC_AUTH_REJECTEDCRED:
+                case RPC_AUTH_REJECTEDVERF:
+                case RPCSEC_GSS_CREDPROBLEM:
+                case RPCSEC_GSS_CTXPROBLEM:
+                        if (!task->tk_cred_retry)
+                                break;
+                        task->tk_cred_retry--;
+                        dprintk("RPC: %4d call_verify: retry stale creds\n",
+                                                        task->tk_pid);
+                        rpcauth_invalcred(task);
+                        task->tk_action = call_refresh;
+                        return NULL;
+                case RPC_AUTH_BADCRED:
+                case RPC_AUTH_BADVERF:
+                        /* possibly garbled cred/verf? */
+                        if (!task->tk_garb_retry)
+                                break;
+                        task->tk_garb_retry--;
+                        dprintk("RPC: %4d call_verify: retry garbled creds\n",
+                                                        task->tk_pid);
+                        task->tk_action = call_bind;
+                        return NULL;
+                case RPC_AUTH_TOOWEAK:
+                        printk(KERN_NOTICE "call_verify: server requires stronger "
+                               "authentication.\n");
+                        break;
+                default:
+                        printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n);
+                        error = -EIO;
+                }
+                dprintk("RPC: %4d call_verify: call rejected %d\n",
+                                                task->tk_pid, n);
+                goto out_err;
+        }
+        if (!(p = rpcauth_checkverf(task, p))) {
+                printk(KERN_WARNING "call_verify: auth check failed\n");
+                goto out_retry;         /* bad verifier, retry */
+        }
+        len = p - (u32 *)iov->iov_base - 1;
+        if (len < 0)
+                goto out_overflow;
+        switch ((n = ntohl(*p++))) {
+        case RPC_SUCCESS:
+                return p;
+        case RPC_PROG_UNAVAIL:
+                printk(KERN_WARNING "RPC: call_verify: program %u is unsupported by server %s\n",
+                                (unsigned int)task->tk_client->cl_prog,
+                                task->tk_client->cl_server);
+                goto out_eio;
+        case RPC_PROG_MISMATCH:
+                printk(KERN_WARNING "RPC: call_verify: program %u, version %u unsupported by server %s\n",
+                                (unsigned int)task->tk_client->cl_prog,
+                                (unsigned int)task->tk_client->cl_vers,
+                                task->tk_client->cl_server);
+                goto out_eio;
+        case RPC_PROC_UNAVAIL:
+                printk(KERN_WARNING "RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n",
+                                task->tk_msg.rpc_proc,
+                                task->tk_client->cl_prog,
+                                task->tk_client->cl_vers,
+                                task->tk_client->cl_server);
+                goto out_eio;
+        case RPC_GARBAGE_ARGS:
+                dprintk("RPC: %4d %s: server saw garbage\n", task->tk_pid, __FUNCTION__);
+                break;                  /* retry */
+        default:
+                printk(KERN_WARNING "call_verify: server accept status: %x\n", n);
+                /* Also retry */
+        }
+
+out_retry:
+        task->tk_client->cl_stats->rpcgarbage++;
+        if (task->tk_garb_retry) {
+                task->tk_garb_retry--;
+                dprintk(KERN_WARNING "RPC %s: retrying %4d\n", __FUNCTION__, task->tk_pid);
+                task->tk_action = call_bind;
+                return NULL;
+        }
+        printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__);
+out_eio:
+        error = -EIO;
+out_err:
+        rpc_exit(task, error);
+        return NULL;
+out_overflow:
+        printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__);
+        goto out_retry;
+}