mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 18:46:45 +07:00
93aa6c7bbc
If we're running out of buffer memory when transmitting data, then we want to just delay for a moment, and then continue transmitting the remainder of the message. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2539 lines
60 KiB
C
2539 lines
60 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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* 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 <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/rcupdate.h>
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#include <linux/utsname.h>
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#include <linux/workqueue.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <linux/un.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/addr.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 <trace/events/sunrpc.h>
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#include "sunrpc.h"
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#include "netns.h"
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#if IS_ENABLED(CONFIG_SUNRPC_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 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_SUNRPC_BACKCHANNEL)
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static void call_bc_transmit(struct rpc_task *task);
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#endif /* CONFIG_SUNRPC_BACKCHANNEL */
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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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struct net *net = rpc_net_ns(clnt);
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struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
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spin_lock(&sn->rpc_client_lock);
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list_add(&clnt->cl_clients, &sn->all_clients);
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spin_unlock(&sn->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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struct net *net = rpc_net_ns(clnt);
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struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
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spin_lock(&sn->rpc_client_lock);
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list_del(&clnt->cl_clients);
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spin_unlock(&sn->rpc_client_lock);
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}
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static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
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{
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rpc_remove_client_dir(clnt);
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}
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static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
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{
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struct net *net = rpc_net_ns(clnt);
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struct super_block *pipefs_sb;
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pipefs_sb = rpc_get_sb_net(net);
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if (pipefs_sb) {
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__rpc_clnt_remove_pipedir(clnt);
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rpc_put_sb_net(net);
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}
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}
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static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb,
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struct rpc_clnt *clnt)
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{
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static uint32_t clntid;
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const char *dir_name = clnt->cl_program->pipe_dir_name;
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char name[15];
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struct dentry *dir, *dentry;
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dir = rpc_d_lookup_sb(sb, dir_name);
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if (dir == NULL) {
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pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name);
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return dir;
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}
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for (;;) {
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snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
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name[sizeof(name) - 1] = '\0';
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dentry = rpc_create_client_dir(dir, name, clnt);
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if (!IS_ERR(dentry))
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break;
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if (dentry == ERR_PTR(-EEXIST))
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continue;
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printk(KERN_INFO "RPC: Couldn't create pipefs entry"
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" %s/%s, error %ld\n",
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dir_name, name, PTR_ERR(dentry));
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break;
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}
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dput(dir);
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return dentry;
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}
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static int
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rpc_setup_pipedir(struct super_block *pipefs_sb, struct rpc_clnt *clnt)
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{
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struct dentry *dentry;
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if (clnt->cl_program->pipe_dir_name != NULL) {
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dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt);
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if (IS_ERR(dentry))
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return PTR_ERR(dentry);
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}
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return 0;
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}
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static int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event)
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{
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if (clnt->cl_program->pipe_dir_name == NULL)
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return 1;
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switch (event) {
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case RPC_PIPEFS_MOUNT:
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if (clnt->cl_pipedir_objects.pdh_dentry != NULL)
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return 1;
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if (atomic_read(&clnt->cl_count) == 0)
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return 1;
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break;
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case RPC_PIPEFS_UMOUNT:
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if (clnt->cl_pipedir_objects.pdh_dentry == NULL)
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return 1;
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break;
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}
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return 0;
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}
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static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event,
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struct super_block *sb)
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{
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struct dentry *dentry;
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int err = 0;
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switch (event) {
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case RPC_PIPEFS_MOUNT:
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dentry = rpc_setup_pipedir_sb(sb, clnt);
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if (!dentry)
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return -ENOENT;
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if (IS_ERR(dentry))
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return PTR_ERR(dentry);
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break;
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case RPC_PIPEFS_UMOUNT:
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__rpc_clnt_remove_pipedir(clnt);
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break;
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default:
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printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event);
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return -ENOTSUPP;
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}
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return err;
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}
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static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
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struct super_block *sb)
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{
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int error = 0;
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for (;; clnt = clnt->cl_parent) {
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if (!rpc_clnt_skip_event(clnt, event))
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error = __rpc_clnt_handle_event(clnt, event, sb);
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if (error || clnt == clnt->cl_parent)
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break;
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}
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return error;
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}
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static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
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{
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struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
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struct rpc_clnt *clnt;
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spin_lock(&sn->rpc_client_lock);
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list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
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if (rpc_clnt_skip_event(clnt, event))
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continue;
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spin_unlock(&sn->rpc_client_lock);
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return clnt;
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}
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spin_unlock(&sn->rpc_client_lock);
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return NULL;
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}
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static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
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void *ptr)
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{
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struct super_block *sb = ptr;
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struct rpc_clnt *clnt;
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int error = 0;
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while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) {
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error = __rpc_pipefs_event(clnt, event, sb);
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if (error)
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break;
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}
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return error;
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}
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static struct notifier_block rpc_clients_block = {
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.notifier_call = rpc_pipefs_event,
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.priority = SUNRPC_PIPEFS_RPC_PRIO,
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};
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int rpc_clients_notifier_register(void)
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{
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return rpc_pipefs_notifier_register(&rpc_clients_block);
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}
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void rpc_clients_notifier_unregister(void)
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{
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return rpc_pipefs_notifier_unregister(&rpc_clients_block);
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}
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static struct rpc_xprt *rpc_clnt_set_transport(struct rpc_clnt *clnt,
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struct rpc_xprt *xprt,
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const struct rpc_timeout *timeout)
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{
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struct rpc_xprt *old;
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spin_lock(&clnt->cl_lock);
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old = rcu_dereference_protected(clnt->cl_xprt,
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lockdep_is_held(&clnt->cl_lock));
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if (!xprt_bound(xprt))
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clnt->cl_autobind = 1;
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clnt->cl_timeout = timeout;
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rcu_assign_pointer(clnt->cl_xprt, xprt);
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spin_unlock(&clnt->cl_lock);
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return old;
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}
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static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename)
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{
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clnt->cl_nodelen = strlcpy(clnt->cl_nodename,
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nodename, sizeof(clnt->cl_nodename));
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}
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static int rpc_client_register(struct rpc_clnt *clnt,
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rpc_authflavor_t pseudoflavor,
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const char *client_name)
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{
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struct rpc_auth_create_args auth_args = {
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.pseudoflavor = pseudoflavor,
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.target_name = client_name,
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};
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struct rpc_auth *auth;
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struct net *net = rpc_net_ns(clnt);
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struct super_block *pipefs_sb;
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int err;
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rpc_clnt_debugfs_register(clnt);
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pipefs_sb = rpc_get_sb_net(net);
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if (pipefs_sb) {
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err = rpc_setup_pipedir(pipefs_sb, clnt);
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if (err)
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goto out;
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}
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rpc_register_client(clnt);
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if (pipefs_sb)
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rpc_put_sb_net(net);
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auth = rpcauth_create(&auth_args, clnt);
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if (IS_ERR(auth)) {
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dprintk("RPC: Couldn't create auth handle (flavor %u)\n",
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pseudoflavor);
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err = PTR_ERR(auth);
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goto err_auth;
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}
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return 0;
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err_auth:
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pipefs_sb = rpc_get_sb_net(net);
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rpc_unregister_client(clnt);
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__rpc_clnt_remove_pipedir(clnt);
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out:
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if (pipefs_sb)
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rpc_put_sb_net(net);
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rpc_clnt_debugfs_unregister(clnt);
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return err;
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}
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static DEFINE_IDA(rpc_clids);
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static int rpc_alloc_clid(struct rpc_clnt *clnt)
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{
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int clid;
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clid = ida_simple_get(&rpc_clids, 0, 0, GFP_KERNEL);
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if (clid < 0)
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return clid;
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clnt->cl_clid = clid;
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return 0;
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}
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static void rpc_free_clid(struct rpc_clnt *clnt)
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{
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ida_simple_remove(&rpc_clids, clnt->cl_clid);
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}
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static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args,
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struct rpc_xprt *xprt,
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struct rpc_clnt *parent)
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{
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const struct rpc_program *program = args->program;
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const struct rpc_version *version;
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struct rpc_clnt *clnt = NULL;
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const struct rpc_timeout *timeout;
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const char *nodename = args->nodename;
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int err;
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/* sanity check the name before trying to print it */
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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 (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 = parent ? : clnt;
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err = rpc_alloc_clid(clnt);
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if (err)
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goto out_no_clid;
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clnt->cl_procinfo = version->procs;
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clnt->cl_maxproc = version->nrprocs;
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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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rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects);
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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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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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timeout = &clnt->cl_timeout_default;
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}
|
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|
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rpc_clnt_set_transport(clnt, xprt, timeout);
|
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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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|
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atomic_set(&clnt->cl_count, 1);
|
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|
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if (nodename == NULL)
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nodename = utsname()->nodename;
|
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/* save the nodename */
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rpc_clnt_set_nodename(clnt, nodename);
|
|
|
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err = rpc_client_register(clnt, args->authflavor, args->client_name);
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if (err)
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goto out_no_path;
|
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if (parent)
|
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atomic_inc(&parent->cl_count);
|
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return clnt;
|
|
|
|
out_no_path:
|
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rpc_free_iostats(clnt->cl_metrics);
|
|
out_no_stats:
|
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rpc_free_clid(clnt);
|
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out_no_clid:
|
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kfree(clnt);
|
|
out_err:
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rpciod_down();
|
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out_no_rpciod:
|
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xprt_put(xprt);
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return ERR_PTR(err);
|
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}
|
|
|
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struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args,
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struct rpc_xprt *xprt)
|
|
{
|
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struct rpc_clnt *clnt = NULL;
|
|
|
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clnt = rpc_new_client(args, xprt, NULL);
|
|
if (IS_ERR(clnt))
|
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return clnt;
|
|
|
|
if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
|
|
int err = rpc_ping(clnt);
|
|
if (err != 0) {
|
|
rpc_shutdown_client(clnt);
|
|
return ERR_PTR(err);
|
|
}
|
|
}
|
|
|
|
clnt->cl_softrtry = 1;
|
|
if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
|
|
clnt->cl_softrtry = 0;
|
|
|
|
if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
|
|
clnt->cl_autobind = 1;
|
|
if (args->flags & RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT)
|
|
clnt->cl_noretranstimeo = 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_xprt);
|
|
|
|
/**
|
|
* rpc_create - create an RPC client and transport with one call
|
|
* @args: rpc_clnt create argument structure
|
|
*
|
|
* Creates and initializes an RPC transport and an RPC client.
|
|
*
|
|
* It can ping the server in order to determine if it is up, and to see if
|
|
* it supports this program and version. RPC_CLNT_CREATE_NOPING disables
|
|
* this behavior so asynchronous tasks can also use rpc_create.
|
|
*/
|
|
struct rpc_clnt *rpc_create(struct rpc_create_args *args)
|
|
{
|
|
struct rpc_xprt *xprt;
|
|
struct xprt_create xprtargs = {
|
|
.net = args->net,
|
|
.ident = args->protocol,
|
|
.srcaddr = args->saddress,
|
|
.dstaddr = args->address,
|
|
.addrlen = args->addrsize,
|
|
.servername = args->servername,
|
|
.bc_xprt = args->bc_xprt,
|
|
};
|
|
char servername[48];
|
|
|
|
if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS)
|
|
xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS;
|
|
if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT)
|
|
xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT;
|
|
/*
|
|
* If the caller chooses not to specify a hostname, whip
|
|
* up a string representation of the passed-in address.
|
|
*/
|
|
if (xprtargs.servername == NULL) {
|
|
struct sockaddr_un *sun =
|
|
(struct sockaddr_un *)args->address;
|
|
struct sockaddr_in *sin =
|
|
(struct sockaddr_in *)args->address;
|
|
struct sockaddr_in6 *sin6 =
|
|
(struct sockaddr_in6 *)args->address;
|
|
|
|
servername[0] = '\0';
|
|
switch (args->address->sa_family) {
|
|
case AF_LOCAL:
|
|
snprintf(servername, sizeof(servername), "%s",
|
|
sun->sun_path);
|
|
break;
|
|
case AF_INET:
|
|
snprintf(servername, sizeof(servername), "%pI4",
|
|
&sin->sin_addr.s_addr);
|
|
break;
|
|
case AF_INET6:
|
|
snprintf(servername, sizeof(servername), "%pI6",
|
|
&sin6->sin6_addr);
|
|
break;
|
|
default:
|
|
/* caller wants default server name, but
|
|
* address family isn't recognized. */
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
xprtargs.servername = servername;
|
|
}
|
|
|
|
xprt = xprt_create_transport(&xprtargs);
|
|
if (IS_ERR(xprt))
|
|
return (struct rpc_clnt *)xprt;
|
|
|
|
/*
|
|
* By default, kernel RPC client connects from a reserved port.
|
|
* CAP_NET_BIND_SERVICE will not be set for unprivileged requesters,
|
|
* but it is always enabled for rpciod, which handles the connect
|
|
* operation.
|
|
*/
|
|
xprt->resvport = 1;
|
|
if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
|
|
xprt->resvport = 0;
|
|
|
|
return rpc_create_xprt(args, xprt);
|
|
}
|
|
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.
|
|
*/
|
|
static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
|
|
struct rpc_clnt *clnt)
|
|
{
|
|
struct rpc_xprt *xprt;
|
|
struct rpc_clnt *new;
|
|
int err;
|
|
|
|
err = -ENOMEM;
|
|
rcu_read_lock();
|
|
xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
|
|
rcu_read_unlock();
|
|
if (xprt == NULL)
|
|
goto out_err;
|
|
args->servername = xprt->servername;
|
|
args->nodename = clnt->cl_nodename;
|
|
|
|
new = rpc_new_client(args, xprt, clnt);
|
|
if (IS_ERR(new)) {
|
|
err = PTR_ERR(new);
|
|
goto out_err;
|
|
}
|
|
|
|
/* Turn off autobind on clones */
|
|
new->cl_autobind = 0;
|
|
new->cl_softrtry = clnt->cl_softrtry;
|
|
new->cl_noretranstimeo = clnt->cl_noretranstimeo;
|
|
new->cl_discrtry = clnt->cl_discrtry;
|
|
new->cl_chatty = clnt->cl_chatty;
|
|
return new;
|
|
|
|
out_err:
|
|
dprintk("RPC: %s: returned error %d\n", __func__, err);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/**
|
|
* rpc_clone_client - Clone an RPC client structure
|
|
*
|
|
* @clnt: RPC client whose parameters are copied
|
|
*
|
|
* Returns a fresh RPC client or an ERR_PTR.
|
|
*/
|
|
struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt)
|
|
{
|
|
struct rpc_create_args args = {
|
|
.program = clnt->cl_program,
|
|
.prognumber = clnt->cl_prog,
|
|
.version = clnt->cl_vers,
|
|
.authflavor = clnt->cl_auth->au_flavor,
|
|
};
|
|
return __rpc_clone_client(&args, clnt);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_clone_client);
|
|
|
|
/**
|
|
* rpc_clone_client_set_auth - Clone an RPC client structure and set its auth
|
|
*
|
|
* @clnt: RPC client whose parameters are copied
|
|
* @flavor: security flavor for new client
|
|
*
|
|
* Returns a fresh RPC client or an ERR_PTR.
|
|
*/
|
|
struct rpc_clnt *
|
|
rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
|
|
{
|
|
struct rpc_create_args args = {
|
|
.program = clnt->cl_program,
|
|
.prognumber = clnt->cl_prog,
|
|
.version = clnt->cl_vers,
|
|
.authflavor = flavor,
|
|
};
|
|
return __rpc_clone_client(&args, clnt);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth);
|
|
|
|
/**
|
|
* rpc_switch_client_transport: switch the RPC transport on the fly
|
|
* @clnt: pointer to a struct rpc_clnt
|
|
* @args: pointer to the new transport arguments
|
|
* @timeout: pointer to the new timeout parameters
|
|
*
|
|
* This function allows the caller to switch the RPC transport for the
|
|
* rpc_clnt structure 'clnt' to allow it to connect to a mirrored NFS
|
|
* server, for instance. It assumes that the caller has ensured that
|
|
* there are no active RPC tasks by using some form of locking.
|
|
*
|
|
* Returns zero if "clnt" is now using the new xprt. Otherwise a
|
|
* negative errno is returned, and "clnt" continues to use the old
|
|
* xprt.
|
|
*/
|
|
int rpc_switch_client_transport(struct rpc_clnt *clnt,
|
|
struct xprt_create *args,
|
|
const struct rpc_timeout *timeout)
|
|
{
|
|
const struct rpc_timeout *old_timeo;
|
|
rpc_authflavor_t pseudoflavor;
|
|
struct rpc_xprt *xprt, *old;
|
|
struct rpc_clnt *parent;
|
|
int err;
|
|
|
|
xprt = xprt_create_transport(args);
|
|
if (IS_ERR(xprt)) {
|
|
dprintk("RPC: failed to create new xprt for clnt %p\n",
|
|
clnt);
|
|
return PTR_ERR(xprt);
|
|
}
|
|
|
|
pseudoflavor = clnt->cl_auth->au_flavor;
|
|
|
|
old_timeo = clnt->cl_timeout;
|
|
old = rpc_clnt_set_transport(clnt, xprt, timeout);
|
|
|
|
rpc_unregister_client(clnt);
|
|
__rpc_clnt_remove_pipedir(clnt);
|
|
rpc_clnt_debugfs_unregister(clnt);
|
|
|
|
/*
|
|
* A new transport was created. "clnt" therefore
|
|
* becomes the root of a new cl_parent tree. clnt's
|
|
* children, if it has any, still point to the old xprt.
|
|
*/
|
|
parent = clnt->cl_parent;
|
|
clnt->cl_parent = clnt;
|
|
|
|
/*
|
|
* The old rpc_auth cache cannot be re-used. GSS
|
|
* contexts in particular are between a single
|
|
* client and server.
|
|
*/
|
|
err = rpc_client_register(clnt, pseudoflavor, NULL);
|
|
if (err)
|
|
goto out_revert;
|
|
|
|
synchronize_rcu();
|
|
if (parent != clnt)
|
|
rpc_release_client(parent);
|
|
xprt_put(old);
|
|
dprintk("RPC: replaced xprt for clnt %p\n", clnt);
|
|
return 0;
|
|
|
|
out_revert:
|
|
rpc_clnt_set_transport(clnt, old, old_timeo);
|
|
clnt->cl_parent = parent;
|
|
rpc_client_register(clnt, pseudoflavor, NULL);
|
|
xprt_put(xprt);
|
|
dprintk("RPC: failed to switch xprt for clnt %p\n", clnt);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_switch_client_transport);
|
|
|
|
/*
|
|
* Kill all tasks for the given client.
|
|
* XXX: kill their descendants as well?
|
|
*/
|
|
void rpc_killall_tasks(struct rpc_clnt *clnt)
|
|
{
|
|
struct rpc_task *rovr;
|
|
|
|
|
|
if (list_empty(&clnt->cl_tasks))
|
|
return;
|
|
dprintk("RPC: killing all tasks for client %p\n", clnt);
|
|
/*
|
|
* Spin lock all_tasks to prevent changes...
|
|
*/
|
|
spin_lock(&clnt->cl_lock);
|
|
list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) {
|
|
if (!RPC_IS_ACTIVATED(rovr))
|
|
continue;
|
|
if (!(rovr->tk_flags & RPC_TASK_KILLED)) {
|
|
rovr->tk_flags |= RPC_TASK_KILLED;
|
|
rpc_exit(rovr, -EIO);
|
|
if (RPC_IS_QUEUED(rovr))
|
|
rpc_wake_up_queued_task(rovr->tk_waitqueue,
|
|
rovr);
|
|
}
|
|
}
|
|
spin_unlock(&clnt->cl_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_killall_tasks);
|
|
|
|
/*
|
|
* Properly shut down an RPC client, terminating all outstanding
|
|
* requests.
|
|
*/
|
|
void rpc_shutdown_client(struct rpc_clnt *clnt)
|
|
{
|
|
might_sleep();
|
|
|
|
dprintk_rcu("RPC: shutting down %s client for %s\n",
|
|
clnt->cl_program->name,
|
|
rcu_dereference(clnt->cl_xprt)->servername);
|
|
|
|
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 struct rpc_clnt *
|
|
rpc_free_client(struct rpc_clnt *clnt)
|
|
{
|
|
struct rpc_clnt *parent = NULL;
|
|
|
|
dprintk_rcu("RPC: destroying %s client for %s\n",
|
|
clnt->cl_program->name,
|
|
rcu_dereference(clnt->cl_xprt)->servername);
|
|
if (clnt->cl_parent != clnt)
|
|
parent = clnt->cl_parent;
|
|
rpc_clnt_debugfs_unregister(clnt);
|
|
rpc_clnt_remove_pipedir(clnt);
|
|
rpc_unregister_client(clnt);
|
|
rpc_free_iostats(clnt->cl_metrics);
|
|
clnt->cl_metrics = NULL;
|
|
xprt_put(rcu_dereference_raw(clnt->cl_xprt));
|
|
rpciod_down();
|
|
rpc_free_clid(clnt);
|
|
kfree(clnt);
|
|
return parent;
|
|
}
|
|
|
|
/*
|
|
* Free an RPC client
|
|
*/
|
|
static struct rpc_clnt *
|
|
rpc_free_auth(struct rpc_clnt *clnt)
|
|
{
|
|
if (clnt->cl_auth == NULL)
|
|
return rpc_free_client(clnt);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
atomic_inc(&clnt->cl_count);
|
|
rpcauth_release(clnt->cl_auth);
|
|
clnt->cl_auth = NULL;
|
|
if (atomic_dec_and_test(&clnt->cl_count))
|
|
return rpc_free_client(clnt);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Release reference to the RPC client
|
|
*/
|
|
void
|
|
rpc_release_client(struct rpc_clnt *clnt)
|
|
{
|
|
dprintk("RPC: rpc_release_client(%p)\n", clnt);
|
|
|
|
do {
|
|
if (list_empty(&clnt->cl_tasks))
|
|
wake_up(&destroy_wait);
|
|
if (!atomic_dec_and_test(&clnt->cl_count))
|
|
break;
|
|
clnt = rpc_free_auth(clnt);
|
|
} while (clnt != NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_release_client);
|
|
|
|
/**
|
|
* 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,
|
|
const struct rpc_program *program,
|
|
u32 vers)
|
|
{
|
|
struct rpc_create_args args = {
|
|
.program = program,
|
|
.prognumber = program->number,
|
|
.version = vers,
|
|
.authflavor = old->cl_auth->au_flavor,
|
|
};
|
|
struct rpc_clnt *clnt;
|
|
int err;
|
|
|
|
clnt = __rpc_clone_client(&args, old);
|
|
if (IS_ERR(clnt))
|
|
goto out;
|
|
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);
|
|
|
|
void rpc_task_release_client(struct rpc_task *task)
|
|
{
|
|
struct rpc_clnt *clnt = task->tk_client;
|
|
|
|
if (clnt != NULL) {
|
|
/* Remove from client task list */
|
|
spin_lock(&clnt->cl_lock);
|
|
list_del(&task->tk_task);
|
|
spin_unlock(&clnt->cl_lock);
|
|
task->tk_client = NULL;
|
|
|
|
rpc_release_client(clnt);
|
|
}
|
|
}
|
|
|
|
static
|
|
void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
|
|
{
|
|
if (clnt != NULL) {
|
|
rpc_task_release_client(task);
|
|
task->tk_client = clnt;
|
|
atomic_inc(&clnt->cl_count);
|
|
if (clnt->cl_softrtry)
|
|
task->tk_flags |= RPC_TASK_SOFT;
|
|
if (clnt->cl_noretranstimeo)
|
|
task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT;
|
|
if (atomic_read(&clnt->cl_swapper))
|
|
task->tk_flags |= RPC_TASK_SWAPPER;
|
|
/* Add to the client's list of all tasks */
|
|
spin_lock(&clnt->cl_lock);
|
|
list_add_tail(&task->tk_task, &clnt->cl_tasks);
|
|
spin_unlock(&clnt->cl_lock);
|
|
}
|
|
}
|
|
|
|
void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt)
|
|
{
|
|
rpc_task_release_client(task);
|
|
rpc_task_set_client(task, clnt);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_task_reset_client);
|
|
|
|
|
|
static void
|
|
rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
|
|
{
|
|
if (msg != NULL) {
|
|
task->tk_msg.rpc_proc = msg->rpc_proc;
|
|
task->tk_msg.rpc_argp = msg->rpc_argp;
|
|
task->tk_msg.rpc_resp = msg->rpc_resp;
|
|
if (msg->rpc_cred != NULL)
|
|
task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
task = rpc_new_task(task_setup_data);
|
|
if (IS_ERR(task))
|
|
goto out;
|
|
|
|
rpc_task_set_client(task, task_setup_data->rpc_client);
|
|
rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
|
|
|
|
if (task->tk_action == NULL)
|
|
rpc_call_start(task);
|
|
|
|
atomic_inc(&task->tk_count);
|
|
rpc_execute(task);
|
|
out:
|
|
return task;
|
|
}
|
|
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;
|
|
|
|
WARN_ON_ONCE(flags & RPC_TASK_ASYNC);
|
|
if (flags & RPC_TASK_ASYNC) {
|
|
rpc_release_calldata(task_setup_data.callback_ops,
|
|
task_setup_data.callback_data);
|
|
return -EINVAL;
|
|
}
|
|
|
|
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_SUNRPC_BACKCHANNEL)
|
|
/**
|
|
* rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run
|
|
* rpc_execute against it
|
|
* @req: RPC request
|
|
*/
|
|
struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req)
|
|
{
|
|
struct rpc_task *task;
|
|
struct xdr_buf *xbufp = &req->rq_snd_buf;
|
|
struct rpc_task_setup task_setup_data = {
|
|
.callback_ops = &rpc_default_ops,
|
|
.flags = RPC_TASK_SOFTCONN,
|
|
};
|
|
|
|
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 (IS_ERR(task)) {
|
|
xprt_free_bc_request(req);
|
|
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);
|
|
WARN_ON_ONCE(atomic_read(&task->tk_count) != 2);
|
|
rpc_execute(task);
|
|
|
|
out:
|
|
dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
|
|
return task;
|
|
}
|
|
#endif /* CONFIG_SUNRPC_BACKCHANNEL */
|
|
|
|
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;
|
|
|
|
rcu_read_lock();
|
|
xprt = rcu_dereference(clnt->cl_xprt);
|
|
|
|
bytes = xprt->addrlen;
|
|
if (bytes > bufsize)
|
|
bytes = bufsize;
|
|
memcpy(buf, &xprt->addr, bytes);
|
|
rcu_read_unlock();
|
|
|
|
return bytes;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_peeraddr);
|
|
|
|
/**
|
|
* rpc_peeraddr2str - return remote peer address in printable format
|
|
* @clnt: RPC client structure
|
|
* @format: address format
|
|
*
|
|
* NB: the lifetime of the memory referenced by the returned pointer is
|
|
* the same as the rpc_xprt itself. As long as the caller uses this
|
|
* pointer, it must hold the RCU read lock.
|
|
*/
|
|
const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
|
|
enum rpc_display_format_t format)
|
|
{
|
|
struct rpc_xprt *xprt;
|
|
|
|
xprt = rcu_dereference(clnt->cl_xprt);
|
|
|
|
if (xprt->address_strings[format] != NULL)
|
|
return xprt->address_strings[format];
|
|
else
|
|
return "unprintable";
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
|
|
|
|
static const struct sockaddr_in rpc_inaddr_loopback = {
|
|
.sin_family = AF_INET,
|
|
.sin_addr.s_addr = htonl(INADDR_ANY),
|
|
};
|
|
|
|
static const struct sockaddr_in6 rpc_in6addr_loopback = {
|
|
.sin6_family = AF_INET6,
|
|
.sin6_addr = IN6ADDR_ANY_INIT,
|
|
};
|
|
|
|
/*
|
|
* Try a getsockname() on a connected datagram socket. Using a
|
|
* connected datagram socket prevents leaving a socket in TIME_WAIT.
|
|
* This conserves the ephemeral port number space.
|
|
*
|
|
* Returns zero and fills in "buf" if successful; otherwise, a
|
|
* negative errno is returned.
|
|
*/
|
|
static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen,
|
|
struct sockaddr *buf, int buflen)
|
|
{
|
|
struct socket *sock;
|
|
int err;
|
|
|
|
err = __sock_create(net, sap->sa_family,
|
|
SOCK_DGRAM, IPPROTO_UDP, &sock, 1);
|
|
if (err < 0) {
|
|
dprintk("RPC: can't create UDP socket (%d)\n", err);
|
|
goto out;
|
|
}
|
|
|
|
switch (sap->sa_family) {
|
|
case AF_INET:
|
|
err = kernel_bind(sock,
|
|
(struct sockaddr *)&rpc_inaddr_loopback,
|
|
sizeof(rpc_inaddr_loopback));
|
|
break;
|
|
case AF_INET6:
|
|
err = kernel_bind(sock,
|
|
(struct sockaddr *)&rpc_in6addr_loopback,
|
|
sizeof(rpc_in6addr_loopback));
|
|
break;
|
|
default:
|
|
err = -EAFNOSUPPORT;
|
|
goto out;
|
|
}
|
|
if (err < 0) {
|
|
dprintk("RPC: can't bind UDP socket (%d)\n", err);
|
|
goto out_release;
|
|
}
|
|
|
|
err = kernel_connect(sock, sap, salen, 0);
|
|
if (err < 0) {
|
|
dprintk("RPC: can't connect UDP socket (%d)\n", err);
|
|
goto out_release;
|
|
}
|
|
|
|
err = kernel_getsockname(sock, buf, &buflen);
|
|
if (err < 0) {
|
|
dprintk("RPC: getsockname failed (%d)\n", err);
|
|
goto out_release;
|
|
}
|
|
|
|
err = 0;
|
|
if (buf->sa_family == AF_INET6) {
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
|
|
sin6->sin6_scope_id = 0;
|
|
}
|
|
dprintk("RPC: %s succeeded\n", __func__);
|
|
|
|
out_release:
|
|
sock_release(sock);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Scraping a connected socket failed, so we don't have a useable
|
|
* local address. Fallback: generate an address that will prevent
|
|
* the server from calling us back.
|
|
*
|
|
* Returns zero and fills in "buf" if successful; otherwise, a
|
|
* negative errno is returned.
|
|
*/
|
|
static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen)
|
|
{
|
|
switch (family) {
|
|
case AF_INET:
|
|
if (buflen < sizeof(rpc_inaddr_loopback))
|
|
return -EINVAL;
|
|
memcpy(buf, &rpc_inaddr_loopback,
|
|
sizeof(rpc_inaddr_loopback));
|
|
break;
|
|
case AF_INET6:
|
|
if (buflen < sizeof(rpc_in6addr_loopback))
|
|
return -EINVAL;
|
|
memcpy(buf, &rpc_in6addr_loopback,
|
|
sizeof(rpc_in6addr_loopback));
|
|
default:
|
|
dprintk("RPC: %s: address family not supported\n",
|
|
__func__);
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
dprintk("RPC: %s: succeeded\n", __func__);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* rpc_localaddr - discover local endpoint address for an RPC client
|
|
* @clnt: RPC client structure
|
|
* @buf: target buffer
|
|
* @buflen: size of target buffer, in bytes
|
|
*
|
|
* Returns zero and fills in "buf" and "buflen" if successful;
|
|
* otherwise, a negative errno is returned.
|
|
*
|
|
* This works even if the underlying transport is not currently connected,
|
|
* or if the upper layer never previously provided a source address.
|
|
*
|
|
* The result of this function call is transient: multiple calls in
|
|
* succession may give different results, depending on how local
|
|
* networking configuration changes over time.
|
|
*/
|
|
int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen)
|
|
{
|
|
struct sockaddr_storage address;
|
|
struct sockaddr *sap = (struct sockaddr *)&address;
|
|
struct rpc_xprt *xprt;
|
|
struct net *net;
|
|
size_t salen;
|
|
int err;
|
|
|
|
rcu_read_lock();
|
|
xprt = rcu_dereference(clnt->cl_xprt);
|
|
salen = xprt->addrlen;
|
|
memcpy(sap, &xprt->addr, salen);
|
|
net = get_net(xprt->xprt_net);
|
|
rcu_read_unlock();
|
|
|
|
rpc_set_port(sap, 0);
|
|
err = rpc_sockname(net, sap, salen, buf, buflen);
|
|
put_net(net);
|
|
if (err != 0)
|
|
/* Couldn't discover local address, return ANYADDR */
|
|
return rpc_anyaddr(sap->sa_family, buf, buflen);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_localaddr);
|
|
|
|
void
|
|
rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
|
|
{
|
|
struct rpc_xprt *xprt;
|
|
|
|
rcu_read_lock();
|
|
xprt = rcu_dereference(clnt->cl_xprt);
|
|
if (xprt->ops->set_buffer_size)
|
|
xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
|
|
rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_setbufsize);
|
|
|
|
/**
|
|
* rpc_protocol - Get transport protocol number for an RPC client
|
|
* @clnt: RPC client to query
|
|
*
|
|
*/
|
|
int rpc_protocol(struct rpc_clnt *clnt)
|
|
{
|
|
int protocol;
|
|
|
|
rcu_read_lock();
|
|
protocol = rcu_dereference(clnt->cl_xprt)->prot;
|
|
rcu_read_unlock();
|
|
return protocol;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_protocol);
|
|
|
|
/**
|
|
* rpc_net_ns - Get the network namespace for this RPC client
|
|
* @clnt: RPC client to query
|
|
*
|
|
*/
|
|
struct net *rpc_net_ns(struct rpc_clnt *clnt)
|
|
{
|
|
struct net *ret;
|
|
|
|
rcu_read_lock();
|
|
ret = rcu_dereference(clnt->cl_xprt)->xprt_net;
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_net_ns);
|
|
|
|
/**
|
|
* rpc_max_payload - Get maximum payload size for a transport, in bytes
|
|
* @clnt: RPC client to query
|
|
*
|
|
* 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)
|
|
{
|
|
size_t ret;
|
|
|
|
rcu_read_lock();
|
|
ret = rcu_dereference(clnt->cl_xprt)->max_payload;
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_max_payload);
|
|
|
|
/**
|
|
* rpc_get_timeout - Get timeout for transport in units of HZ
|
|
* @clnt: RPC client to query
|
|
*/
|
|
unsigned long rpc_get_timeout(struct rpc_clnt *clnt)
|
|
{
|
|
unsigned long ret;
|
|
|
|
rcu_read_lock();
|
|
ret = rcu_dereference(clnt->cl_xprt)->timeout->to_initval;
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_get_timeout);
|
|
|
|
/**
|
|
* 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) {
|
|
rcu_read_lock();
|
|
xprt_clear_bound(rcu_dereference(clnt->cl_xprt));
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_force_rebind);
|
|
|
|
/*
|
|
* Restart an (async) RPC call from the call_prepare state.
|
|
* Usually called from within the exit handler.
|
|
*/
|
|
int
|
|
rpc_restart_call_prepare(struct rpc_task *task)
|
|
{
|
|
if (RPC_ASSASSINATED(task))
|
|
return 0;
|
|
task->tk_action = call_start;
|
|
task->tk_status = 0;
|
|
if (task->tk_ops->rpc_call_prepare != NULL)
|
|
task->tk_action = rpc_prepare_task;
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
|
|
|
|
/*
|
|
* Restart an (async) RPC call. Usually called from within the
|
|
* exit handler.
|
|
*/
|
|
int
|
|
rpc_restart_call(struct rpc_task *task)
|
|
{
|
|
if (RPC_ASSASSINATED(task))
|
|
return 0;
|
|
task->tk_action = call_start;
|
|
task->tk_status = 0;
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_restart_call);
|
|
|
|
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
|
|
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_program->name, 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);
|
|
|
|
task->tk_status = 0;
|
|
task->tk_action = call_reserveresult;
|
|
xprt_reserve(task);
|
|
}
|
|
|
|
static void call_retry_reserve(struct rpc_task *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_refresh;
|
|
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 -ENOMEM:
|
|
rpc_delay(task, HZ >> 2);
|
|
case -EAGAIN: /* woken up; retry */
|
|
task->tk_action = call_retry_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);
|
|
}
|
|
|
|
/*
|
|
* 1c. Retry reserving an RPC call slot
|
|
*/
|
|
static void
|
|
call_retry_reserve(struct rpc_task *task)
|
|
{
|
|
dprint_status(task);
|
|
|
|
task->tk_status = 0;
|
|
task->tk_action = call_reserveresult;
|
|
xprt_retry_reserve(task);
|
|
}
|
|
|
|
/*
|
|
* 2. Bind and/or refresh the credentials
|
|
*/
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 2a. 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_refresh;
|
|
switch (status) {
|
|
case 0:
|
|
if (rpcauth_uptodatecred(task)) {
|
|
task->tk_action = call_allocate;
|
|
return;
|
|
}
|
|
/* Use rate-limiting and a max number of retries if refresh
|
|
* had status 0 but failed to update the cred.
|
|
*/
|
|
case -ETIMEDOUT:
|
|
rpc_delay(task, 3*HZ);
|
|
case -EAGAIN:
|
|
status = -EACCES;
|
|
case -EKEYEXPIRED:
|
|
if (!task->tk_cred_retry)
|
|
break;
|
|
task->tk_cred_retry--;
|
|
dprintk("RPC: %5u %s: retry refresh creds\n",
|
|
task->tk_pid, __func__);
|
|
return;
|
|
}
|
|
dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
|
|
task->tk_pid, __func__, status);
|
|
rpc_exit(task, status);
|
|
}
|
|
|
|
/*
|
|
* 2b. 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_rqstp->rq_cred->cr_auth->au_cslack;
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
struct rpc_xprt *xprt = req->rq_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;
|
|
xprt_inject_disconnect(xprt);
|
|
|
|
dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
|
|
|
|
if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
|
|
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;
|
|
kxdreproc_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_rqstp->rq_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;
|
|
}
|
|
|
|
trace_rpc_bind_status(task);
|
|
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;
|
|
}
|
|
if (task->tk_rebind_retry == 0)
|
|
break;
|
|
task->tk_rebind_retry--;
|
|
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);
|
|
goto retry_timeout;
|
|
case -ECONNREFUSED: /* connection problems */
|
|
case -ECONNRESET:
|
|
case -ECONNABORTED:
|
|
case -ENOTCONN:
|
|
case -EHOSTDOWN:
|
|
case -EHOSTUNREACH:
|
|
case -ENETUNREACH:
|
|
case -ENOBUFS:
|
|
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_status = 0;
|
|
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_rqstp->rq_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;
|
|
if (task->tk_flags & RPC_TASK_NOCONNECT) {
|
|
rpc_exit(task, -ENOTCONN);
|
|
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);
|
|
|
|
trace_rpc_connect_status(task, status);
|
|
task->tk_status = 0;
|
|
switch (status) {
|
|
case -ECONNREFUSED:
|
|
case -ECONNRESET:
|
|
case -ECONNABORTED:
|
|
case -ENETUNREACH:
|
|
case -EHOSTUNREACH:
|
|
case -EADDRINUSE:
|
|
case -ENOBUFS:
|
|
case -EPIPE:
|
|
if (RPC_IS_SOFTCONN(task))
|
|
break;
|
|
/* retry with existing socket, after a delay */
|
|
rpc_delay(task, 3*HZ);
|
|
case -EAGAIN:
|
|
/* Check for timeouts before looping back to call_bind */
|
|
case -ETIMEDOUT:
|
|
task->tk_action = call_timeout;
|
|
return;
|
|
case 0:
|
|
clnt->cl_stats->netreconn++;
|
|
task->tk_action = call_transmit;
|
|
return;
|
|
}
|
|
rpc_exit(task, status);
|
|
}
|
|
|
|
/*
|
|
* 5. Transmit the RPC request, and wait for reply
|
|
*/
|
|
static void
|
|
call_transmit(struct rpc_task *task)
|
|
{
|
|
int is_retrans = RPC_WAS_SENT(task);
|
|
|
|
dprint_status(task);
|
|
|
|
task->tk_action = call_status;
|
|
if (task->tk_status < 0)
|
|
return;
|
|
if (!xprt_prepare_transmit(task))
|
|
return;
|
|
task->tk_action = call_transmit_status;
|
|
/* Encode here so that rpcsec_gss can use correct sequence number. */
|
|
if (rpc_task_need_encode(task)) {
|
|
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;
|
|
if (is_retrans)
|
|
task->tk_client->cl_stats->rpcretrans++;
|
|
/*
|
|
* 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_rqstp->rq_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:
|
|
case -ENOBUFS:
|
|
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:
|
|
case -EPERM:
|
|
if (RPC_IS_SOFTCONN(task)) {
|
|
xprt_end_transmit(task);
|
|
rpc_exit(task, task->tk_status);
|
|
break;
|
|
}
|
|
case -ECONNRESET:
|
|
case -ECONNABORTED:
|
|
case -EADDRINUSE:
|
|
case -ENOTCONN:
|
|
case -EPIPE:
|
|
rpc_task_force_reencode(task);
|
|
}
|
|
}
|
|
|
|
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
|
|
/*
|
|
* 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;
|
|
|
|
if (!xprt_prepare_transmit(task))
|
|
goto out_retry;
|
|
|
|
if (task->tk_status < 0) {
|
|
printk(KERN_NOTICE "RPC: Could not send backchannel reply "
|
|
"error: %d\n", task->tk_status);
|
|
goto out_done;
|
|
}
|
|
if (req->rq_connect_cookie != req->rq_xprt->connect_cookie)
|
|
req->rq_bytes_sent = 0;
|
|
|
|
xprt_transmit(task);
|
|
|
|
if (task->tk_status == -EAGAIN)
|
|
goto out_nospace;
|
|
|
|
xprt_end_transmit(task);
|
|
dprint_status(task);
|
|
switch (task->tk_status) {
|
|
case 0:
|
|
/* Success */
|
|
case -EHOSTDOWN:
|
|
case -EHOSTUNREACH:
|
|
case -ENETUNREACH:
|
|
case -ECONNRESET:
|
|
case -ECONNREFUSED:
|
|
case -EADDRINUSE:
|
|
case -ENOTCONN:
|
|
case -EPIPE:
|
|
break;
|
|
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(req->rq_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.
|
|
*/
|
|
WARN_ON_ONCE(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);
|
|
out_done:
|
|
task->tk_action = rpc_exit_task;
|
|
return;
|
|
out_nospace:
|
|
req->rq_connect_cookie = req->rq_xprt->connect_cookie;
|
|
out_retry:
|
|
task->tk_status = 0;
|
|
}
|
|
#endif /* CONFIG_SUNRPC_BACKCHANNEL */
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
trace_rpc_call_status(task);
|
|
task->tk_status = 0;
|
|
switch(status) {
|
|
case -EHOSTDOWN:
|
|
case -EHOSTUNREACH:
|
|
case -ENETUNREACH:
|
|
case -EPERM:
|
|
if (RPC_IS_SOFTCONN(task)) {
|
|
rpc_exit(task, status);
|
|
break;
|
|
}
|
|
/*
|
|
* 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_flags & RPC_TASK_NO_RETRANS_TIMEOUT)
|
|
&& task->tk_client->cl_discrtry)
|
|
xprt_conditional_disconnect(req->rq_xprt,
|
|
req->rq_connect_cookie);
|
|
break;
|
|
case -ECONNREFUSED:
|
|
case -ECONNRESET:
|
|
case -ECONNABORTED:
|
|
rpc_force_rebind(clnt);
|
|
case -EADDRINUSE:
|
|
rpc_delay(task, 3*HZ);
|
|
case -EPIPE:
|
|
case -ENOTCONN:
|
|
task->tk_action = call_bind;
|
|
break;
|
|
case -ENOBUFS:
|
|
rpc_delay(task, HZ>>2);
|
|
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_program->name, -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) {
|
|
rcu_read_lock();
|
|
printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
|
|
clnt->cl_program->name,
|
|
rcu_dereference(clnt->cl_xprt)->servername);
|
|
rcu_read_unlock();
|
|
}
|
|
if (task->tk_flags & RPC_TASK_TIMEOUT)
|
|
rpc_exit(task, -ETIMEDOUT);
|
|
else
|
|
rpc_exit(task, -EIO);
|
|
return;
|
|
}
|
|
|
|
if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
|
|
task->tk_flags |= RPC_CALL_MAJORSEEN;
|
|
if (clnt->cl_chatty) {
|
|
rcu_read_lock();
|
|
printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
|
|
clnt->cl_program->name,
|
|
rcu_dereference(clnt->cl_xprt)->servername);
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
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:
|
|
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;
|
|
kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode;
|
|
__be32 *p;
|
|
|
|
dprint_status(task);
|
|
|
|
if (task->tk_flags & RPC_CALL_MAJORSEEN) {
|
|
if (clnt->cl_chatty) {
|
|
rcu_read_lock();
|
|
printk(KERN_NOTICE "%s: server %s OK\n",
|
|
clnt->cl_program->name,
|
|
rcu_dereference(clnt->cl_xprt)->servername);
|
|
rcu_read_unlock();
|
|
}
|
|
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;
|
|
goto out_retry;
|
|
}
|
|
dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
|
|
clnt->cl_program->name, 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(req->rq_xprt,
|
|
req->rq_connect_cookie);
|
|
}
|
|
}
|
|
|
|
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(req->rq_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 rpc_clnt *clnt = task->tk_client;
|
|
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);
|
|
error = -EIO;
|
|
goto out_err;
|
|
}
|
|
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);
|
|
error = -EIO;
|
|
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);
|
|
error = -EIO;
|
|
goto out_err;
|
|
}
|
|
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_reserve;
|
|
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:
|
|
rcu_read_lock();
|
|
printk(KERN_NOTICE "RPC: server %s requires stronger "
|
|
"authentication.\n",
|
|
rcu_dereference(clnt->cl_xprt)->servername);
|
|
rcu_read_unlock();
|
|
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;
|
|
}
|
|
p = rpcauth_checkverf(task, p);
|
|
if (IS_ERR(p)) {
|
|
error = PTR_ERR(p);
|
|
dprintk("RPC: %5u %s: auth check failed with %d\n",
|
|
task->tk_pid, __func__, error);
|
|
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_rcu("RPC: %5u %s: program %u is unsupported "
|
|
"by server %s\n", task->tk_pid, __func__,
|
|
(unsigned int)clnt->cl_prog,
|
|
rcu_dereference(clnt->cl_xprt)->servername);
|
|
error = -EPFNOSUPPORT;
|
|
goto out_err;
|
|
case RPC_PROG_MISMATCH:
|
|
dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported "
|
|
"by server %s\n", task->tk_pid, __func__,
|
|
(unsigned int)clnt->cl_prog,
|
|
(unsigned int)clnt->cl_vers,
|
|
rcu_dereference(clnt->cl_xprt)->servername);
|
|
error = -EPROTONOSUPPORT;
|
|
goto out_err;
|
|
case RPC_PROC_UNAVAIL:
|
|
dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, "
|
|
"version %u on server %s\n",
|
|
task->tk_pid, __func__,
|
|
rpc_proc_name(task),
|
|
clnt->cl_prog, clnt->cl_vers,
|
|
rcu_dereference(clnt->cl_xprt)->servername);
|
|
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:
|
|
clnt->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_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 void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
|
|
{
|
|
}
|
|
|
|
static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, 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);
|
|
|
|
#if IS_ENABLED(CONFIG_SUNRPC_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";
|
|
|
|
if (RPC_IS_QUEUED(task))
|
|
rpc_waitq = rpc_qname(task->tk_waitqueue);
|
|
|
|
printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
|
|
task->tk_pid, task->tk_flags, task->tk_status,
|
|
clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
|
|
clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task),
|
|
task->tk_action, rpc_waitq);
|
|
}
|
|
|
|
void rpc_show_tasks(struct net *net)
|
|
{
|
|
struct rpc_clnt *clnt;
|
|
struct rpc_task *task;
|
|
int header = 0;
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
|
|
spin_lock(&sn->rpc_client_lock);
|
|
list_for_each_entry(clnt, &sn->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(&sn->rpc_client_lock);
|
|
}
|
|
#endif
|
|
|
|
#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
|
|
int
|
|
rpc_clnt_swap_activate(struct rpc_clnt *clnt)
|
|
{
|
|
int ret = 0;
|
|
struct rpc_xprt *xprt;
|
|
|
|
if (atomic_inc_return(&clnt->cl_swapper) == 1) {
|
|
retry:
|
|
rcu_read_lock();
|
|
xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
|
|
rcu_read_unlock();
|
|
if (!xprt) {
|
|
/*
|
|
* If we didn't get a reference, then we likely are
|
|
* racing with a migration event. Wait for a grace
|
|
* period and try again.
|
|
*/
|
|
synchronize_rcu();
|
|
goto retry;
|
|
}
|
|
|
|
ret = xprt_enable_swap(xprt);
|
|
xprt_put(xprt);
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_clnt_swap_activate);
|
|
|
|
void
|
|
rpc_clnt_swap_deactivate(struct rpc_clnt *clnt)
|
|
{
|
|
struct rpc_xprt *xprt;
|
|
|
|
if (atomic_dec_if_positive(&clnt->cl_swapper) == 0) {
|
|
retry:
|
|
rcu_read_lock();
|
|
xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
|
|
rcu_read_unlock();
|
|
if (!xprt) {
|
|
/*
|
|
* If we didn't get a reference, then we likely are
|
|
* racing with a migration event. Wait for a grace
|
|
* period and try again.
|
|
*/
|
|
synchronize_rcu();
|
|
goto retry;
|
|
}
|
|
|
|
xprt_disable_swap(xprt);
|
|
xprt_put(xprt);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_clnt_swap_deactivate);
|
|
#endif /* CONFIG_SUNRPC_SWAP */
|