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![Trond Myklebust](/assets/img/avatar_default.png)
Currently rpc_run_bc_task() will return NULL if the task allocation failed. However the only caller is bc_send, which assumes that the return value will be an ERR_PTR. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
1795 lines
43 KiB
C
1795 lines
43 KiB
C
/*
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* linux/net/sunrpc/clnt.c
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*
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* This file contains the high-level RPC interface.
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* It is modeled as a finite state machine to support both synchronous
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* and asynchronous requests.
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*
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* - RPC header generation and argument serialization.
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* - Credential refresh.
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* - TCP connect handling.
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* - Retry of operation when it is suspected the operation failed because
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* of uid squashing on the server, or when the credentials were stale
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* and need to be refreshed, or when a packet was damaged in transit.
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* This may be have to be moved to the VFS layer.
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*
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* NB: BSD uses a more intelligent approach to guessing when a request
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* or reply has been lost by keeping the RTO estimate for each procedure.
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* We currently make do with a constant timeout value.
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*
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* Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
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* Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#include <asm/system.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kallsyms.h>
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#include <linux/mm.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/slab.h>
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#include <linux/utsname.h>
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#include <linux/workqueue.h>
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#include <linux/in6.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/rpc_pipe_fs.h>
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#include <linux/sunrpc/metrics.h>
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#include <linux/sunrpc/bc_xprt.h>
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#include "sunrpc.h"
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#ifdef RPC_DEBUG
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# define RPCDBG_FACILITY RPCDBG_CALL
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#endif
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#define dprint_status(t) \
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dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \
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__func__, t->tk_status)
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/*
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* All RPC clients are linked into this list
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*/
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static LIST_HEAD(all_clients);
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static DEFINE_SPINLOCK(rpc_client_lock);
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static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
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static void call_start(struct rpc_task *task);
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static void call_reserve(struct rpc_task *task);
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static void call_reserveresult(struct rpc_task *task);
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static void call_allocate(struct rpc_task *task);
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static void call_decode(struct rpc_task *task);
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static void call_bind(struct rpc_task *task);
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static void call_bind_status(struct rpc_task *task);
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static void call_transmit(struct rpc_task *task);
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#if defined(CONFIG_NFS_V4_1)
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static void call_bc_transmit(struct rpc_task *task);
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#endif /* CONFIG_NFS_V4_1 */
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static void call_status(struct rpc_task *task);
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static void call_transmit_status(struct rpc_task *task);
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static void call_refresh(struct rpc_task *task);
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static void call_refreshresult(struct rpc_task *task);
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static void call_timeout(struct rpc_task *task);
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static void call_connect(struct rpc_task *task);
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static void call_connect_status(struct rpc_task *task);
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static __be32 *rpc_encode_header(struct rpc_task *task);
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static __be32 *rpc_verify_header(struct rpc_task *task);
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static int rpc_ping(struct rpc_clnt *clnt);
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static void rpc_register_client(struct rpc_clnt *clnt)
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{
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spin_lock(&rpc_client_lock);
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list_add(&clnt->cl_clients, &all_clients);
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spin_unlock(&rpc_client_lock);
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}
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static void rpc_unregister_client(struct rpc_clnt *clnt)
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{
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spin_lock(&rpc_client_lock);
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list_del(&clnt->cl_clients);
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spin_unlock(&rpc_client_lock);
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}
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static int
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rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
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{
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static uint32_t clntid;
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struct nameidata nd;
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struct path path;
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char name[15];
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struct qstr q = {
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.name = name,
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};
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int error;
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clnt->cl_path.mnt = ERR_PTR(-ENOENT);
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clnt->cl_path.dentry = ERR_PTR(-ENOENT);
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if (dir_name == NULL)
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return 0;
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path.mnt = rpc_get_mount();
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if (IS_ERR(path.mnt))
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return PTR_ERR(path.mnt);
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error = vfs_path_lookup(path.mnt->mnt_root, path.mnt, dir_name, 0, &nd);
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if (error)
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goto err;
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for (;;) {
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q.len = snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
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name[sizeof(name) - 1] = '\0';
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q.hash = full_name_hash(q.name, q.len);
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path.dentry = rpc_create_client_dir(nd.path.dentry, &q, clnt);
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if (!IS_ERR(path.dentry))
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break;
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error = PTR_ERR(path.dentry);
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if (error != -EEXIST) {
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printk(KERN_INFO "RPC: Couldn't create pipefs entry"
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" %s/%s, error %d\n",
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dir_name, name, error);
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goto err_path_put;
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}
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}
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path_put(&nd.path);
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clnt->cl_path = path;
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return 0;
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err_path_put:
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path_put(&nd.path);
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err:
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rpc_put_mount();
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return error;
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}
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static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt)
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{
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struct rpc_program *program = args->program;
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struct rpc_version *version;
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struct rpc_clnt *clnt = NULL;
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struct rpc_auth *auth;
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int err;
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size_t len;
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/* sanity check the name before trying to print it */
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err = -EINVAL;
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len = strlen(args->servername);
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if (len > RPC_MAXNETNAMELEN)
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goto out_no_rpciod;
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len++;
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dprintk("RPC: creating %s client for %s (xprt %p)\n",
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program->name, args->servername, xprt);
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err = rpciod_up();
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if (err)
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goto out_no_rpciod;
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err = -EINVAL;
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if (!xprt)
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goto out_no_xprt;
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if (args->version >= program->nrvers)
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goto out_err;
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version = program->version[args->version];
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if (version == NULL)
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goto out_err;
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err = -ENOMEM;
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clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
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if (!clnt)
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goto out_err;
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clnt->cl_parent = clnt;
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clnt->cl_server = clnt->cl_inline_name;
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if (len > sizeof(clnt->cl_inline_name)) {
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char *buf = kmalloc(len, GFP_KERNEL);
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if (buf != NULL)
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clnt->cl_server = buf;
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else
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len = sizeof(clnt->cl_inline_name);
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}
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strlcpy(clnt->cl_server, args->servername, len);
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clnt->cl_xprt = xprt;
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clnt->cl_procinfo = version->procs;
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clnt->cl_maxproc = version->nrprocs;
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clnt->cl_protname = program->name;
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clnt->cl_prog = args->prognumber ? : program->number;
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clnt->cl_vers = version->number;
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clnt->cl_stats = program->stats;
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clnt->cl_metrics = rpc_alloc_iostats(clnt);
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err = -ENOMEM;
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if (clnt->cl_metrics == NULL)
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goto out_no_stats;
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clnt->cl_program = program;
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INIT_LIST_HEAD(&clnt->cl_tasks);
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spin_lock_init(&clnt->cl_lock);
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if (!xprt_bound(clnt->cl_xprt))
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clnt->cl_autobind = 1;
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clnt->cl_timeout = xprt->timeout;
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if (args->timeout != NULL) {
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memcpy(&clnt->cl_timeout_default, args->timeout,
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sizeof(clnt->cl_timeout_default));
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clnt->cl_timeout = &clnt->cl_timeout_default;
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}
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clnt->cl_rtt = &clnt->cl_rtt_default;
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rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
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clnt->cl_principal = NULL;
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if (args->client_name) {
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clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL);
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if (!clnt->cl_principal)
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goto out_no_principal;
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}
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kref_init(&clnt->cl_kref);
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err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
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if (err < 0)
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goto out_no_path;
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auth = rpcauth_create(args->authflavor, clnt);
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if (IS_ERR(auth)) {
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printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
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args->authflavor);
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err = PTR_ERR(auth);
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goto out_no_auth;
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}
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/* save the nodename */
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clnt->cl_nodelen = strlen(init_utsname()->nodename);
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if (clnt->cl_nodelen > UNX_MAXNODENAME)
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clnt->cl_nodelen = UNX_MAXNODENAME;
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memcpy(clnt->cl_nodename, init_utsname()->nodename, clnt->cl_nodelen);
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rpc_register_client(clnt);
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return clnt;
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out_no_auth:
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if (!IS_ERR(clnt->cl_path.dentry)) {
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rpc_remove_client_dir(clnt->cl_path.dentry);
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rpc_put_mount();
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}
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out_no_path:
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kfree(clnt->cl_principal);
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out_no_principal:
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rpc_free_iostats(clnt->cl_metrics);
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out_no_stats:
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if (clnt->cl_server != clnt->cl_inline_name)
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kfree(clnt->cl_server);
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kfree(clnt);
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out_err:
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xprt_put(xprt);
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out_no_xprt:
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rpciod_down();
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out_no_rpciod:
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return ERR_PTR(err);
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}
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/*
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* rpc_create - create an RPC client and transport with one call
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* @args: rpc_clnt create argument structure
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*
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* Creates and initializes an RPC transport and an RPC client.
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*
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* It can ping the server in order to determine if it is up, and to see if
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* it supports this program and version. RPC_CLNT_CREATE_NOPING disables
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* this behavior so asynchronous tasks can also use rpc_create.
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*/
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struct rpc_clnt *rpc_create(struct rpc_create_args *args)
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{
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struct rpc_xprt *xprt;
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struct rpc_clnt *clnt;
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struct xprt_create xprtargs = {
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.ident = args->protocol,
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.srcaddr = args->saddress,
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.dstaddr = args->address,
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.addrlen = args->addrsize,
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.bc_xprt = args->bc_xprt,
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};
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char servername[48];
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/*
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* If the caller chooses not to specify a hostname, whip
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* up a string representation of the passed-in address.
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*/
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if (args->servername == NULL) {
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servername[0] = '\0';
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switch (args->address->sa_family) {
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case AF_INET: {
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struct sockaddr_in *sin =
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(struct sockaddr_in *)args->address;
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snprintf(servername, sizeof(servername), "%pI4",
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&sin->sin_addr.s_addr);
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break;
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}
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case AF_INET6: {
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struct sockaddr_in6 *sin =
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(struct sockaddr_in6 *)args->address;
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snprintf(servername, sizeof(servername), "%pI6",
|
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&sin->sin6_addr);
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break;
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}
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default:
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/* caller wants default server name, but
|
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* address family isn't recognized. */
|
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return ERR_PTR(-EINVAL);
|
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}
|
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args->servername = servername;
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}
|
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|
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xprt = xprt_create_transport(&xprtargs);
|
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if (IS_ERR(xprt))
|
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return (struct rpc_clnt *)xprt;
|
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|
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/*
|
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* By default, kernel RPC client connects from a reserved port.
|
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* CAP_NET_BIND_SERVICE will not be set for unprivileged requesters,
|
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* but it is always enabled for rpciod, which handles the connect
|
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* operation.
|
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*/
|
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xprt->resvport = 1;
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if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
|
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xprt->resvport = 0;
|
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|
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clnt = rpc_new_client(args, xprt);
|
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if (IS_ERR(clnt))
|
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return clnt;
|
|
|
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if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
|
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int err = rpc_ping(clnt);
|
|
if (err != 0) {
|
|
rpc_shutdown_client(clnt);
|
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return ERR_PTR(err);
|
|
}
|
|
}
|
|
|
|
clnt->cl_softrtry = 1;
|
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if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
|
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clnt->cl_softrtry = 0;
|
|
|
|
if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
|
|
clnt->cl_autobind = 1;
|
|
if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
|
|
clnt->cl_discrtry = 1;
|
|
if (!(args->flags & RPC_CLNT_CREATE_QUIET))
|
|
clnt->cl_chatty = 1;
|
|
|
|
return clnt;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_create);
|
|
|
|
/*
|
|
* 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;
|
|
int err = -ENOMEM;
|
|
|
|
new = kmemdup(clnt, sizeof(*new), GFP_KERNEL);
|
|
if (!new)
|
|
goto out_no_clnt;
|
|
new->cl_parent = clnt;
|
|
/* Turn off autobind on clones */
|
|
new->cl_autobind = 0;
|
|
INIT_LIST_HEAD(&new->cl_tasks);
|
|
spin_lock_init(&new->cl_lock);
|
|
rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval);
|
|
new->cl_metrics = rpc_alloc_iostats(clnt);
|
|
if (new->cl_metrics == NULL)
|
|
goto out_no_stats;
|
|
if (clnt->cl_principal) {
|
|
new->cl_principal = kstrdup(clnt->cl_principal, GFP_KERNEL);
|
|
if (new->cl_principal == NULL)
|
|
goto out_no_principal;
|
|
}
|
|
kref_init(&new->cl_kref);
|
|
err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name);
|
|
if (err != 0)
|
|
goto out_no_path;
|
|
if (new->cl_auth)
|
|
atomic_inc(&new->cl_auth->au_count);
|
|
xprt_get(clnt->cl_xprt);
|
|
kref_get(&clnt->cl_kref);
|
|
rpc_register_client(new);
|
|
rpciod_up();
|
|
return new;
|
|
out_no_path:
|
|
kfree(new->cl_principal);
|
|
out_no_principal:
|
|
rpc_free_iostats(new->cl_metrics);
|
|
out_no_stats:
|
|
kfree(new);
|
|
out_no_clnt:
|
|
dprintk("RPC: %s: returned error %d\n", __func__, err);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_clone_client);
|
|
|
|
/*
|
|
* Properly shut down an RPC client, terminating all outstanding
|
|
* requests.
|
|
*/
|
|
void rpc_shutdown_client(struct rpc_clnt *clnt)
|
|
{
|
|
dprintk("RPC: shutting down %s client for %s\n",
|
|
clnt->cl_protname, clnt->cl_server);
|
|
|
|
while (!list_empty(&clnt->cl_tasks)) {
|
|
rpc_killall_tasks(clnt);
|
|
wait_event_timeout(destroy_wait,
|
|
list_empty(&clnt->cl_tasks), 1*HZ);
|
|
}
|
|
|
|
rpc_release_client(clnt);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_shutdown_client);
|
|
|
|
/*
|
|
* Free an RPC client
|
|
*/
|
|
static void
|
|
rpc_free_client(struct kref *kref)
|
|
{
|
|
struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref);
|
|
|
|
dprintk("RPC: destroying %s client for %s\n",
|
|
clnt->cl_protname, clnt->cl_server);
|
|
if (!IS_ERR(clnt->cl_path.dentry)) {
|
|
rpc_remove_client_dir(clnt->cl_path.dentry);
|
|
rpc_put_mount();
|
|
}
|
|
if (clnt->cl_parent != clnt) {
|
|
rpc_release_client(clnt->cl_parent);
|
|
goto out_free;
|
|
}
|
|
if (clnt->cl_server != clnt->cl_inline_name)
|
|
kfree(clnt->cl_server);
|
|
out_free:
|
|
rpc_unregister_client(clnt);
|
|
rpc_free_iostats(clnt->cl_metrics);
|
|
kfree(clnt->cl_principal);
|
|
clnt->cl_metrics = NULL;
|
|
xprt_put(clnt->cl_xprt);
|
|
rpciod_down();
|
|
kfree(clnt);
|
|
}
|
|
|
|
/*
|
|
* Free an RPC client
|
|
*/
|
|
static void
|
|
rpc_free_auth(struct kref *kref)
|
|
{
|
|
struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref);
|
|
|
|
if (clnt->cl_auth == NULL) {
|
|
rpc_free_client(kref);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Note: RPCSEC_GSS may need to send NULL RPC calls in order to
|
|
* release remaining GSS contexts. This mechanism ensures
|
|
* that it can do so safely.
|
|
*/
|
|
kref_init(kref);
|
|
rpcauth_release(clnt->cl_auth);
|
|
clnt->cl_auth = NULL;
|
|
kref_put(kref, rpc_free_client);
|
|
}
|
|
|
|
/*
|
|
* Release reference to the RPC client
|
|
*/
|
|
void
|
|
rpc_release_client(struct rpc_clnt *clnt)
|
|
{
|
|
dprintk("RPC: rpc_release_client(%p)\n", clnt);
|
|
|
|
if (list_empty(&clnt->cl_tasks))
|
|
wake_up(&destroy_wait);
|
|
kref_put(&clnt->cl_kref, rpc_free_auth);
|
|
}
|
|
|
|
/**
|
|
* rpc_bind_new_program - bind a new RPC program to an existing client
|
|
* @old: old rpc_client
|
|
* @program: rpc program to set
|
|
* @vers: rpc program version
|
|
*
|
|
* Clones the rpc client and sets up a new RPC program. This is mainly
|
|
* of use for enabling different RPC programs to share the same transport.
|
|
* The Sun NFSv2/v3 ACL protocol can do this.
|
|
*/
|
|
struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
|
|
struct rpc_program *program,
|
|
u32 vers)
|
|
{
|
|
struct rpc_clnt *clnt;
|
|
struct rpc_version *version;
|
|
int err;
|
|
|
|
BUG_ON(vers >= program->nrvers || !program->version[vers]);
|
|
version = program->version[vers];
|
|
clnt = rpc_clone_client(old);
|
|
if (IS_ERR(clnt))
|
|
goto out;
|
|
clnt->cl_procinfo = version->procs;
|
|
clnt->cl_maxproc = version->nrprocs;
|
|
clnt->cl_protname = program->name;
|
|
clnt->cl_prog = program->number;
|
|
clnt->cl_vers = version->number;
|
|
clnt->cl_stats = program->stats;
|
|
err = rpc_ping(clnt);
|
|
if (err != 0) {
|
|
rpc_shutdown_client(clnt);
|
|
clnt = ERR_PTR(err);
|
|
}
|
|
out:
|
|
return clnt;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_bind_new_program);
|
|
|
|
/*
|
|
* Default callback for async RPC calls
|
|
*/
|
|
static void
|
|
rpc_default_callback(struct rpc_task *task, void *data)
|
|
{
|
|
}
|
|
|
|
static const struct rpc_call_ops rpc_default_ops = {
|
|
.rpc_call_done = rpc_default_callback,
|
|
};
|
|
|
|
/**
|
|
* rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
|
|
* @task_setup_data: pointer to task initialisation data
|
|
*/
|
|
struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
|
|
{
|
|
struct rpc_task *task, *ret;
|
|
|
|
task = rpc_new_task(task_setup_data);
|
|
if (task == NULL) {
|
|
rpc_release_calldata(task_setup_data->callback_ops,
|
|
task_setup_data->callback_data);
|
|
ret = ERR_PTR(-ENOMEM);
|
|
goto out;
|
|
}
|
|
|
|
if (task->tk_status != 0) {
|
|
ret = ERR_PTR(task->tk_status);
|
|
rpc_put_task(task);
|
|
goto out;
|
|
}
|
|
atomic_inc(&task->tk_count);
|
|
rpc_execute(task);
|
|
ret = task;
|
|
out:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_run_task);
|
|
|
|
/**
|
|
* rpc_call_sync - Perform a synchronous RPC call
|
|
* @clnt: pointer to RPC client
|
|
* @msg: RPC call parameters
|
|
* @flags: RPC call flags
|
|
*/
|
|
int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
|
|
{
|
|
struct rpc_task *task;
|
|
struct rpc_task_setup task_setup_data = {
|
|
.rpc_client = clnt,
|
|
.rpc_message = msg,
|
|
.callback_ops = &rpc_default_ops,
|
|
.flags = flags,
|
|
};
|
|
int status;
|
|
|
|
BUG_ON(flags & RPC_TASK_ASYNC);
|
|
|
|
task = rpc_run_task(&task_setup_data);
|
|
if (IS_ERR(task))
|
|
return PTR_ERR(task);
|
|
status = task->tk_status;
|
|
rpc_put_task(task);
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_call_sync);
|
|
|
|
/**
|
|
* rpc_call_async - Perform an asynchronous RPC call
|
|
* @clnt: pointer to RPC client
|
|
* @msg: RPC call parameters
|
|
* @flags: RPC call flags
|
|
* @tk_ops: RPC call ops
|
|
* @data: user call data
|
|
*/
|
|
int
|
|
rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
|
|
const struct rpc_call_ops *tk_ops, void *data)
|
|
{
|
|
struct rpc_task *task;
|
|
struct rpc_task_setup task_setup_data = {
|
|
.rpc_client = clnt,
|
|
.rpc_message = msg,
|
|
.callback_ops = tk_ops,
|
|
.callback_data = data,
|
|
.flags = flags|RPC_TASK_ASYNC,
|
|
};
|
|
|
|
task = rpc_run_task(&task_setup_data);
|
|
if (IS_ERR(task))
|
|
return PTR_ERR(task);
|
|
rpc_put_task(task);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_call_async);
|
|
|
|
#if defined(CONFIG_NFS_V4_1)
|
|
/**
|
|
* rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run
|
|
* rpc_execute against it
|
|
* @req: RPC request
|
|
* @tk_ops: RPC call ops
|
|
*/
|
|
struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req,
|
|
const struct rpc_call_ops *tk_ops)
|
|
{
|
|
struct rpc_task *task;
|
|
struct xdr_buf *xbufp = &req->rq_snd_buf;
|
|
struct rpc_task_setup task_setup_data = {
|
|
.callback_ops = tk_ops,
|
|
};
|
|
|
|
dprintk("RPC: rpc_run_bc_task req= %p\n", req);
|
|
/*
|
|
* Create an rpc_task to send the data
|
|
*/
|
|
task = rpc_new_task(&task_setup_data);
|
|
if (!task) {
|
|
xprt_free_bc_request(req);
|
|
task = ERR_PTR(-ENOMEM);
|
|
goto out;
|
|
}
|
|
task->tk_rqstp = req;
|
|
|
|
/*
|
|
* Set up the xdr_buf length.
|
|
* This also indicates that the buffer is XDR encoded already.
|
|
*/
|
|
xbufp->len = xbufp->head[0].iov_len + xbufp->page_len +
|
|
xbufp->tail[0].iov_len;
|
|
|
|
task->tk_action = call_bc_transmit;
|
|
atomic_inc(&task->tk_count);
|
|
BUG_ON(atomic_read(&task->tk_count) != 2);
|
|
rpc_execute(task);
|
|
|
|
out:
|
|
dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
|
|
return task;
|
|
}
|
|
#endif /* CONFIG_NFS_V4_1 */
|
|
|
|
void
|
|
rpc_call_start(struct rpc_task *task)
|
|
{
|
|
task->tk_action = call_start;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_call_start);
|
|
|
|
/**
|
|
* rpc_peeraddr - extract remote peer address from clnt's xprt
|
|
* @clnt: RPC client structure
|
|
* @buf: target buffer
|
|
* @bufsize: length of target buffer
|
|
*
|
|
* Returns the number of bytes that are actually in the stored address.
|
|
*/
|
|
size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
|
|
{
|
|
size_t bytes;
|
|
struct rpc_xprt *xprt = clnt->cl_xprt;
|
|
|
|
bytes = sizeof(xprt->addr);
|
|
if (bytes > bufsize)
|
|
bytes = bufsize;
|
|
memcpy(buf, &clnt->cl_xprt->addr, bytes);
|
|
return xprt->addrlen;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_peeraddr);
|
|
|
|
/**
|
|
* rpc_peeraddr2str - return remote peer address in printable format
|
|
* @clnt: RPC client structure
|
|
* @format: address format
|
|
*
|
|
*/
|
|
const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
|
|
enum rpc_display_format_t format)
|
|
{
|
|
struct rpc_xprt *xprt = clnt->cl_xprt;
|
|
|
|
if (xprt->address_strings[format] != NULL)
|
|
return xprt->address_strings[format];
|
|
else
|
|
return "unprintable";
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
|
|
|
|
void
|
|
rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
|
|
{
|
|
struct rpc_xprt *xprt = clnt->cl_xprt;
|
|
if (xprt->ops->set_buffer_size)
|
|
xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_setbufsize);
|
|
|
|
/*
|
|
* 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_GPL(rpc_max_payload);
|
|
|
|
/**
|
|
* rpc_force_rebind - force transport to check that remote port is unchanged
|
|
* @clnt: client to rebind
|
|
*
|
|
*/
|
|
void rpc_force_rebind(struct rpc_clnt *clnt)
|
|
{
|
|
if (clnt->cl_autobind)
|
|
xprt_clear_bound(clnt->cl_xprt);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_force_rebind);
|
|
|
|
/*
|
|
* Restart an (async) RPC call from the call_prepare state.
|
|
* Usually called from within the exit handler.
|
|
*/
|
|
void
|
|
rpc_restart_call_prepare(struct rpc_task *task)
|
|
{
|
|
if (RPC_ASSASSINATED(task))
|
|
return;
|
|
task->tk_action = rpc_prepare_task;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_restart_call);
|
|
|
|
#ifdef RPC_DEBUG
|
|
static const char *rpc_proc_name(const struct rpc_task *task)
|
|
{
|
|
const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
|
|
|
|
if (proc) {
|
|
if (proc->p_name)
|
|
return proc->p_name;
|
|
else
|
|
return "NULL";
|
|
} else
|
|
return "no proc";
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 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: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
|
|
clnt->cl_protname, clnt->cl_vers,
|
|
rpc_proc_name(task),
|
|
(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)
|
|
{
|
|
dprint_status(task);
|
|
|
|
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;
|
|
|
|
dprint_status(task);
|
|
|
|
/*
|
|
* 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",
|
|
__func__, 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",
|
|
__func__, 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",
|
|
__func__, status);
|
|
break;
|
|
}
|
|
rpc_exit(task, status);
|
|
}
|
|
|
|
/*
|
|
* 2. Allocate the buffer. For details, see sched.c:rpc_malloc.
|
|
* (Note: buffer memory is freed in xprt_release).
|
|
*/
|
|
static void
|
|
call_allocate(struct rpc_task *task)
|
|
{
|
|
unsigned int slack = task->tk_msg.rpc_cred->cr_auth->au_cslack;
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
struct rpc_xprt *xprt = task->tk_xprt;
|
|
struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
|
|
|
|
dprint_status(task);
|
|
|
|
task->tk_status = 0;
|
|
task->tk_action = call_bind;
|
|
|
|
if (req->rq_buffer)
|
|
return;
|
|
|
|
if (proc->p_proc != 0) {
|
|
BUG_ON(proc->p_arglen == 0);
|
|
if (proc->p_decode != NULL)
|
|
BUG_ON(proc->p_replen == 0);
|
|
}
|
|
|
|
/*
|
|
* Calculate the size (in quads) of the RPC call
|
|
* and reply headers, and convert both values
|
|
* to byte sizes.
|
|
*/
|
|
req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
|
|
req->rq_callsize <<= 2;
|
|
req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
|
|
req->rq_rcvsize <<= 2;
|
|
|
|
req->rq_buffer = xprt->ops->buf_alloc(task,
|
|
req->rq_callsize + req->rq_rcvsize);
|
|
if (req->rq_buffer != NULL)
|
|
return;
|
|
|
|
dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
|
|
|
|
if (RPC_IS_ASYNC(task) || !signalled()) {
|
|
task->tk_action = call_allocate;
|
|
rpc_delay(task, HZ>>4);
|
|
return;
|
|
}
|
|
|
|
rpc_exit(task, -ERESTARTSYS);
|
|
}
|
|
|
|
static inline int
|
|
rpc_task_need_encode(struct rpc_task *task)
|
|
{
|
|
return task->tk_rqstp->rq_snd_buf.len == 0;
|
|
}
|
|
|
|
static inline void
|
|
rpc_task_force_reencode(struct rpc_task *task)
|
|
{
|
|
task->tk_rqstp->rq_snd_buf.len = 0;
|
|
task->tk_rqstp->rq_bytes_sent = 0;
|
|
}
|
|
|
|
static inline void
|
|
rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
|
|
{
|
|
buf->head[0].iov_base = start;
|
|
buf->head[0].iov_len = len;
|
|
buf->tail[0].iov_len = 0;
|
|
buf->page_len = 0;
|
|
buf->flags = 0;
|
|
buf->len = 0;
|
|
buf->buflen = len;
|
|
}
|
|
|
|
/*
|
|
* 3. Encode arguments of an RPC call
|
|
*/
|
|
static void
|
|
rpc_xdr_encode(struct rpc_task *task)
|
|
{
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
kxdrproc_t encode;
|
|
__be32 *p;
|
|
|
|
dprint_status(task);
|
|
|
|
rpc_xdr_buf_init(&req->rq_snd_buf,
|
|
req->rq_buffer,
|
|
req->rq_callsize);
|
|
rpc_xdr_buf_init(&req->rq_rcv_buf,
|
|
(char *)req->rq_buffer + req->rq_callsize,
|
|
req->rq_rcvsize);
|
|
|
|
p = rpc_encode_header(task);
|
|
if (p == NULL) {
|
|
printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
|
|
rpc_exit(task, -EIO);
|
|
return;
|
|
}
|
|
|
|
encode = task->tk_msg.rpc_proc->p_encode;
|
|
if (encode == NULL)
|
|
return;
|
|
|
|
task->tk_status = rpcauth_wrap_req(task, encode, req, p,
|
|
task->tk_msg.rpc_argp);
|
|
}
|
|
|
|
/*
|
|
* 4. Get the server port number if not yet set
|
|
*/
|
|
static void
|
|
call_bind(struct rpc_task *task)
|
|
{
|
|
struct rpc_xprt *xprt = task->tk_xprt;
|
|
|
|
dprint_status(task);
|
|
|
|
task->tk_action = call_connect;
|
|
if (!xprt_bound(xprt)) {
|
|
task->tk_action = call_bind_status;
|
|
task->tk_timeout = xprt->bind_timeout;
|
|
xprt->ops->rpcbind(task);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 4a. Sort out bind result
|
|
*/
|
|
static void
|
|
call_bind_status(struct rpc_task *task)
|
|
{
|
|
int status = -EIO;
|
|
|
|
if (task->tk_status >= 0) {
|
|
dprint_status(task);
|
|
task->tk_status = 0;
|
|
task->tk_action = call_connect;
|
|
return;
|
|
}
|
|
|
|
switch (task->tk_status) {
|
|
case -ENOMEM:
|
|
dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
|
|
rpc_delay(task, HZ >> 2);
|
|
goto retry_timeout;
|
|
case -EACCES:
|
|
dprintk("RPC: %5u remote rpcbind: RPC program/version "
|
|
"unavailable\n", task->tk_pid);
|
|
/* fail immediately if this is an RPC ping */
|
|
if (task->tk_msg.rpc_proc->p_proc == 0) {
|
|
status = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
rpc_delay(task, 3*HZ);
|
|
goto retry_timeout;
|
|
case -ETIMEDOUT:
|
|
dprintk("RPC: %5u rpcbind request timed out\n",
|
|
task->tk_pid);
|
|
goto retry_timeout;
|
|
case -EPFNOSUPPORT:
|
|
/* server doesn't support any rpcbind version we know of */
|
|
dprintk("RPC: %5u unrecognized remote rpcbind service\n",
|
|
task->tk_pid);
|
|
break;
|
|
case -EPROTONOSUPPORT:
|
|
dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
|
|
task->tk_pid);
|
|
task->tk_status = 0;
|
|
task->tk_action = call_bind;
|
|
return;
|
|
case -ECONNREFUSED: /* connection problems */
|
|
case -ECONNRESET:
|
|
case -ENOTCONN:
|
|
case -EHOSTDOWN:
|
|
case -EHOSTUNREACH:
|
|
case -ENETUNREACH:
|
|
case -EPIPE:
|
|
dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
|
|
task->tk_pid, task->tk_status);
|
|
if (!RPC_IS_SOFTCONN(task)) {
|
|
rpc_delay(task, 5*HZ);
|
|
goto retry_timeout;
|
|
}
|
|
status = task->tk_status;
|
|
break;
|
|
default:
|
|
dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
|
|
task->tk_pid, -task->tk_status);
|
|
}
|
|
|
|
rpc_exit(task, status);
|
|
return;
|
|
|
|
retry_timeout:
|
|
task->tk_action = call_timeout;
|
|
}
|
|
|
|
/*
|
|
* 4b. Connect to the RPC server
|
|
*/
|
|
static void
|
|
call_connect(struct rpc_task *task)
|
|
{
|
|
struct rpc_xprt *xprt = task->tk_xprt;
|
|
|
|
dprintk("RPC: %5u call_connect xprt %p %s connected\n",
|
|
task->tk_pid, xprt,
|
|
(xprt_connected(xprt) ? "is" : "is not"));
|
|
|
|
task->tk_action = call_transmit;
|
|
if (!xprt_connected(xprt)) {
|
|
task->tk_action = call_connect_status;
|
|
if (task->tk_status < 0)
|
|
return;
|
|
xprt_connect(task);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 4c. 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;
|
|
|
|
dprint_status(task);
|
|
|
|
task->tk_status = 0;
|
|
if (status >= 0 || status == -EAGAIN) {
|
|
clnt->cl_stats->netreconn++;
|
|
task->tk_action = call_transmit;
|
|
return;
|
|
}
|
|
|
|
switch (status) {
|
|
/* if soft mounted, test if we've timed out */
|
|
case -ETIMEDOUT:
|
|
task->tk_action = call_timeout;
|
|
break;
|
|
default:
|
|
rpc_exit(task, -EIO);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 5. Transmit the RPC request, and wait for reply
|
|
*/
|
|
static void
|
|
call_transmit(struct rpc_task *task)
|
|
{
|
|
dprint_status(task);
|
|
|
|
task->tk_action = call_status;
|
|
if (task->tk_status < 0)
|
|
return;
|
|
task->tk_status = xprt_prepare_transmit(task);
|
|
if (task->tk_status != 0)
|
|
return;
|
|
task->tk_action = call_transmit_status;
|
|
/* Encode here so that rpcsec_gss can use correct sequence number. */
|
|
if (rpc_task_need_encode(task)) {
|
|
BUG_ON(task->tk_rqstp->rq_bytes_sent != 0);
|
|
rpc_xdr_encode(task);
|
|
/* Did the encode result in an error condition? */
|
|
if (task->tk_status != 0) {
|
|
/* Was the error nonfatal? */
|
|
if (task->tk_status == -EAGAIN)
|
|
rpc_delay(task, HZ >> 4);
|
|
else
|
|
rpc_exit(task, task->tk_status);
|
|
return;
|
|
}
|
|
}
|
|
xprt_transmit(task);
|
|
if (task->tk_status < 0)
|
|
return;
|
|
/*
|
|
* On success, ensure that we call xprt_end_transmit() before sleeping
|
|
* in order to allow access to the socket to other RPC requests.
|
|
*/
|
|
call_transmit_status(task);
|
|
if (rpc_reply_expected(task))
|
|
return;
|
|
task->tk_action = rpc_exit_task;
|
|
rpc_wake_up_queued_task(&task->tk_xprt->pending, task);
|
|
}
|
|
|
|
/*
|
|
* 5a. Handle cleanup after a transmission
|
|
*/
|
|
static void
|
|
call_transmit_status(struct rpc_task *task)
|
|
{
|
|
task->tk_action = call_status;
|
|
|
|
/*
|
|
* Common case: success. Force the compiler to put this
|
|
* test first.
|
|
*/
|
|
if (task->tk_status == 0) {
|
|
xprt_end_transmit(task);
|
|
rpc_task_force_reencode(task);
|
|
return;
|
|
}
|
|
|
|
switch (task->tk_status) {
|
|
case -EAGAIN:
|
|
break;
|
|
default:
|
|
dprint_status(task);
|
|
xprt_end_transmit(task);
|
|
rpc_task_force_reencode(task);
|
|
break;
|
|
/*
|
|
* Special cases: if we've been waiting on the
|
|
* socket's write_space() callback, or if the
|
|
* socket just returned a connection error,
|
|
* then hold onto the transport lock.
|
|
*/
|
|
case -ECONNREFUSED:
|
|
case -EHOSTDOWN:
|
|
case -EHOSTUNREACH:
|
|
case -ENETUNREACH:
|
|
if (RPC_IS_SOFTCONN(task)) {
|
|
xprt_end_transmit(task);
|
|
rpc_exit(task, task->tk_status);
|
|
break;
|
|
}
|
|
case -ECONNRESET:
|
|
case -ENOTCONN:
|
|
case -EPIPE:
|
|
rpc_task_force_reencode(task);
|
|
}
|
|
}
|
|
|
|
#if defined(CONFIG_NFS_V4_1)
|
|
/*
|
|
* 5b. Send the backchannel RPC reply. On error, drop the reply. In
|
|
* addition, disconnect on connectivity errors.
|
|
*/
|
|
static void
|
|
call_bc_transmit(struct rpc_task *task)
|
|
{
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
|
|
BUG_ON(task->tk_status != 0);
|
|
task->tk_status = xprt_prepare_transmit(task);
|
|
if (task->tk_status == -EAGAIN) {
|
|
/*
|
|
* Could not reserve the transport. Try again after the
|
|
* transport is released.
|
|
*/
|
|
task->tk_status = 0;
|
|
task->tk_action = call_bc_transmit;
|
|
return;
|
|
}
|
|
|
|
task->tk_action = rpc_exit_task;
|
|
if (task->tk_status < 0) {
|
|
printk(KERN_NOTICE "RPC: Could not send backchannel reply "
|
|
"error: %d\n", task->tk_status);
|
|
return;
|
|
}
|
|
|
|
xprt_transmit(task);
|
|
xprt_end_transmit(task);
|
|
dprint_status(task);
|
|
switch (task->tk_status) {
|
|
case 0:
|
|
/* Success */
|
|
break;
|
|
case -EHOSTDOWN:
|
|
case -EHOSTUNREACH:
|
|
case -ENETUNREACH:
|
|
case -ETIMEDOUT:
|
|
/*
|
|
* Problem reaching the server. Disconnect and let the
|
|
* forechannel reestablish the connection. The server will
|
|
* have to retransmit the backchannel request and we'll
|
|
* reprocess it. Since these ops are idempotent, there's no
|
|
* need to cache our reply at this time.
|
|
*/
|
|
printk(KERN_NOTICE "RPC: Could not send backchannel reply "
|
|
"error: %d\n", task->tk_status);
|
|
xprt_conditional_disconnect(task->tk_xprt,
|
|
req->rq_connect_cookie);
|
|
break;
|
|
default:
|
|
/*
|
|
* We were unable to reply and will have to drop the
|
|
* request. The server should reconnect and retransmit.
|
|
*/
|
|
BUG_ON(task->tk_status == -EAGAIN);
|
|
printk(KERN_NOTICE "RPC: Could not send backchannel reply "
|
|
"error: %d\n", task->tk_status);
|
|
break;
|
|
}
|
|
rpc_wake_up_queued_task(&req->rq_xprt->pending, task);
|
|
}
|
|
#endif /* CONFIG_NFS_V4_1 */
|
|
|
|
/*
|
|
* 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_reply_bytes_recvd > 0 && !req->rq_bytes_sent)
|
|
task->tk_status = req->rq_reply_bytes_recvd;
|
|
|
|
dprint_status(task);
|
|
|
|
status = task->tk_status;
|
|
if (status >= 0) {
|
|
task->tk_action = call_decode;
|
|
return;
|
|
}
|
|
|
|
task->tk_status = 0;
|
|
switch(status) {
|
|
case -EHOSTDOWN:
|
|
case -EHOSTUNREACH:
|
|
case -ENETUNREACH:
|
|
/*
|
|
* Delay any retries for 3 seconds, then handle as if it
|
|
* were a timeout.
|
|
*/
|
|
rpc_delay(task, 3*HZ);
|
|
case -ETIMEDOUT:
|
|
task->tk_action = call_timeout;
|
|
if (task->tk_client->cl_discrtry)
|
|
xprt_conditional_disconnect(task->tk_xprt,
|
|
req->rq_connect_cookie);
|
|
break;
|
|
case -ECONNRESET:
|
|
case -ECONNREFUSED:
|
|
rpc_force_rebind(clnt);
|
|
rpc_delay(task, 3*HZ);
|
|
case -EPIPE:
|
|
case -ENOTCONN:
|
|
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);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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: %5u call_timeout (minor)\n", task->tk_pid);
|
|
goto retry;
|
|
}
|
|
|
|
dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
|
|
task->tk_timeouts++;
|
|
|
|
if (RPC_IS_SOFTCONN(task)) {
|
|
rpc_exit(task, -ETIMEDOUT);
|
|
return;
|
|
}
|
|
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 (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
|
|
task->tk_flags |= RPC_CALL_MAJORSEEN;
|
|
if (clnt->cl_chatty)
|
|
printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
|
|
clnt->cl_protname, clnt->cl_server);
|
|
}
|
|
rpc_force_rebind(clnt);
|
|
/*
|
|
* Did our request time out due to an RPCSEC_GSS out-of-sequence
|
|
* event? RFC2203 requires the server to drop all such requests.
|
|
*/
|
|
rpcauth_invalcred(task);
|
|
|
|
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;
|
|
__be32 *p;
|
|
|
|
dprintk("RPC: %5u call_decode (status %d)\n",
|
|
task->tk_pid, task->tk_status);
|
|
|
|
if (task->tk_flags & RPC_CALL_MAJORSEEN) {
|
|
if (clnt->cl_chatty)
|
|
printk(KERN_NOTICE "%s: server %s OK\n",
|
|
clnt->cl_protname, clnt->cl_server);
|
|
task->tk_flags &= ~RPC_CALL_MAJORSEEN;
|
|
}
|
|
|
|
/*
|
|
* Ensure that we see all writes made by xprt_complete_rqst()
|
|
* before it changed req->rq_reply_bytes_recvd.
|
|
*/
|
|
smp_rmb();
|
|
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);
|
|
|
|
if (req->rq_rcv_buf.len < 12) {
|
|
if (!RPC_IS_SOFT(task)) {
|
|
task->tk_action = call_bind;
|
|
clnt->cl_stats->rpcretrans++;
|
|
goto out_retry;
|
|
}
|
|
dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
|
|
clnt->cl_protname, task->tk_status);
|
|
task->tk_action = call_timeout;
|
|
goto out_retry;
|
|
}
|
|
|
|
p = rpc_verify_header(task);
|
|
if (IS_ERR(p)) {
|
|
if (p == ERR_PTR(-EAGAIN))
|
|
goto out_retry;
|
|
return;
|
|
}
|
|
|
|
task->tk_action = rpc_exit_task;
|
|
|
|
if (decode) {
|
|
task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
|
|
task->tk_msg.rpc_resp);
|
|
}
|
|
dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
|
|
task->tk_status);
|
|
return;
|
|
out_retry:
|
|
task->tk_status = 0;
|
|
/* Note: rpc_verify_header() may have freed the RPC slot */
|
|
if (task->tk_rqstp == req) {
|
|
req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0;
|
|
if (task->tk_client->cl_discrtry)
|
|
xprt_conditional_disconnect(task->tk_xprt,
|
|
req->rq_connect_cookie);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 8. Refresh the credentials if rejected by the server
|
|
*/
|
|
static void
|
|
call_refresh(struct rpc_task *task)
|
|
{
|
|
dprint_status(task);
|
|
|
|
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;
|
|
|
|
dprint_status(task);
|
|
|
|
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;
|
|
}
|
|
|
|
static __be32 *
|
|
rpc_encode_header(struct rpc_task *task)
|
|
{
|
|
struct rpc_clnt *clnt = task->tk_client;
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
__be32 *p = req->rq_svec[0].iov_base;
|
|
|
|
/* FIXME: check buffer size? */
|
|
|
|
p = xprt_skip_transport_header(task->tk_xprt, p);
|
|
*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 */
|
|
p = rpcauth_marshcred(task, p);
|
|
req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
|
|
return p;
|
|
}
|
|
|
|
static __be32 *
|
|
rpc_verify_header(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;
|
|
__be32 *p = iov->iov_base;
|
|
u32 n;
|
|
int error = -EACCES;
|
|
|
|
if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
|
|
/* RFC-1014 says that the representation of XDR data must be a
|
|
* multiple of four bytes
|
|
* - if it isn't pointer subtraction in the NFS client may give
|
|
* undefined results
|
|
*/
|
|
dprintk("RPC: %5u %s: XDR representation not a multiple of"
|
|
" 4 bytes: 0x%x\n", task->tk_pid, __func__,
|
|
task->tk_rqstp->rq_rcv_buf.len);
|
|
goto out_eio;
|
|
}
|
|
if ((len -= 3) < 0)
|
|
goto out_overflow;
|
|
|
|
p += 1; /* skip XID */
|
|
if ((n = ntohl(*p++)) != RPC_REPLY) {
|
|
dprintk("RPC: %5u %s: not an RPC reply: %x\n",
|
|
task->tk_pid, __func__, n);
|
|
goto out_garbage;
|
|
}
|
|
|
|
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:
|
|
dprintk("RPC: %5u %s: RPC call version "
|
|
"mismatch!\n",
|
|
task->tk_pid, __func__);
|
|
error = -EPROTONOSUPPORT;
|
|
goto out_err;
|
|
default:
|
|
dprintk("RPC: %5u %s: RPC call rejected, "
|
|
"unknown error: %x\n",
|
|
task->tk_pid, __func__, 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: %5u %s: retry stale creds\n",
|
|
task->tk_pid, __func__);
|
|
rpcauth_invalcred(task);
|
|
/* Ensure we obtain a new XID! */
|
|
xprt_release(task);
|
|
task->tk_action = call_refresh;
|
|
goto out_retry;
|
|
case RPC_AUTH_BADCRED:
|
|
case RPC_AUTH_BADVERF:
|
|
/* possibly garbled cred/verf? */
|
|
if (!task->tk_garb_retry)
|
|
break;
|
|
task->tk_garb_retry--;
|
|
dprintk("RPC: %5u %s: retry garbled creds\n",
|
|
task->tk_pid, __func__);
|
|
task->tk_action = call_bind;
|
|
goto out_retry;
|
|
case RPC_AUTH_TOOWEAK:
|
|
printk(KERN_NOTICE "RPC: server %s requires stronger "
|
|
"authentication.\n", task->tk_client->cl_server);
|
|
break;
|
|
default:
|
|
dprintk("RPC: %5u %s: unknown auth error: %x\n",
|
|
task->tk_pid, __func__, n);
|
|
error = -EIO;
|
|
}
|
|
dprintk("RPC: %5u %s: call rejected %d\n",
|
|
task->tk_pid, __func__, n);
|
|
goto out_err;
|
|
}
|
|
if (!(p = rpcauth_checkverf(task, p))) {
|
|
dprintk("RPC: %5u %s: auth check failed\n",
|
|
task->tk_pid, __func__);
|
|
goto out_garbage; /* bad verifier, retry */
|
|
}
|
|
len = p - (__be32 *)iov->iov_base - 1;
|
|
if (len < 0)
|
|
goto out_overflow;
|
|
switch ((n = ntohl(*p++))) {
|
|
case RPC_SUCCESS:
|
|
return p;
|
|
case RPC_PROG_UNAVAIL:
|
|
dprintk("RPC: %5u %s: program %u is unsupported by server %s\n",
|
|
task->tk_pid, __func__,
|
|
(unsigned int)task->tk_client->cl_prog,
|
|
task->tk_client->cl_server);
|
|
error = -EPFNOSUPPORT;
|
|
goto out_err;
|
|
case RPC_PROG_MISMATCH:
|
|
dprintk("RPC: %5u %s: program %u, version %u unsupported by "
|
|
"server %s\n", task->tk_pid, __func__,
|
|
(unsigned int)task->tk_client->cl_prog,
|
|
(unsigned int)task->tk_client->cl_vers,
|
|
task->tk_client->cl_server);
|
|
error = -EPROTONOSUPPORT;
|
|
goto out_err;
|
|
case RPC_PROC_UNAVAIL:
|
|
dprintk("RPC: %5u %s: proc %s unsupported by program %u, "
|
|
"version %u on server %s\n",
|
|
task->tk_pid, __func__,
|
|
rpc_proc_name(task),
|
|
task->tk_client->cl_prog,
|
|
task->tk_client->cl_vers,
|
|
task->tk_client->cl_server);
|
|
error = -EOPNOTSUPP;
|
|
goto out_err;
|
|
case RPC_GARBAGE_ARGS:
|
|
dprintk("RPC: %5u %s: server saw garbage\n",
|
|
task->tk_pid, __func__);
|
|
break; /* retry */
|
|
default:
|
|
dprintk("RPC: %5u %s: server accept status: %x\n",
|
|
task->tk_pid, __func__, n);
|
|
/* Also retry */
|
|
}
|
|
|
|
out_garbage:
|
|
task->tk_client->cl_stats->rpcgarbage++;
|
|
if (task->tk_garb_retry) {
|
|
task->tk_garb_retry--;
|
|
dprintk("RPC: %5u %s: retrying\n",
|
|
task->tk_pid, __func__);
|
|
task->tk_action = call_bind;
|
|
out_retry:
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
out_eio:
|
|
error = -EIO;
|
|
out_err:
|
|
rpc_exit(task, error);
|
|
dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
|
|
__func__, error);
|
|
return ERR_PTR(error);
|
|
out_overflow:
|
|
dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
|
|
__func__);
|
|
goto out_garbage;
|
|
}
|
|
|
|
static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct rpc_procinfo rpcproc_null = {
|
|
.p_encode = rpcproc_encode_null,
|
|
.p_decode = rpcproc_decode_null,
|
|
};
|
|
|
|
static int rpc_ping(struct rpc_clnt *clnt)
|
|
{
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &rpcproc_null,
|
|
};
|
|
int err;
|
|
msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
|
|
err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN);
|
|
put_rpccred(msg.rpc_cred);
|
|
return err;
|
|
}
|
|
|
|
struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
|
|
{
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &rpcproc_null,
|
|
.rpc_cred = cred,
|
|
};
|
|
struct rpc_task_setup task_setup_data = {
|
|
.rpc_client = clnt,
|
|
.rpc_message = &msg,
|
|
.callback_ops = &rpc_default_ops,
|
|
.flags = flags,
|
|
};
|
|
return rpc_run_task(&task_setup_data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_call_null);
|
|
|
|
#ifdef RPC_DEBUG
|
|
static void rpc_show_header(void)
|
|
{
|
|
printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
|
|
"-timeout ---ops--\n");
|
|
}
|
|
|
|
static void rpc_show_task(const struct rpc_clnt *clnt,
|
|
const struct rpc_task *task)
|
|
{
|
|
const char *rpc_waitq = "none";
|
|
char *p, action[KSYM_SYMBOL_LEN];
|
|
|
|
if (RPC_IS_QUEUED(task))
|
|
rpc_waitq = rpc_qname(task->tk_waitqueue);
|
|
|
|
/* map tk_action pointer to a function name; then trim off
|
|
* the "+0x0 [sunrpc]" */
|
|
sprint_symbol(action, (unsigned long)task->tk_action);
|
|
p = strchr(action, '+');
|
|
if (p)
|
|
*p = '\0';
|
|
|
|
printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%s q:%s\n",
|
|
task->tk_pid, task->tk_flags, task->tk_status,
|
|
clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
|
|
clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task),
|
|
action, rpc_waitq);
|
|
}
|
|
|
|
void rpc_show_tasks(void)
|
|
{
|
|
struct rpc_clnt *clnt;
|
|
struct rpc_task *task;
|
|
int header = 0;
|
|
|
|
spin_lock(&rpc_client_lock);
|
|
list_for_each_entry(clnt, &all_clients, cl_clients) {
|
|
spin_lock(&clnt->cl_lock);
|
|
list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
|
|
if (!header) {
|
|
rpc_show_header();
|
|
header++;
|
|
}
|
|
rpc_show_task(clnt, task);
|
|
}
|
|
spin_unlock(&clnt->cl_lock);
|
|
}
|
|
spin_unlock(&rpc_client_lock);
|
|
}
|
|
#endif
|