Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Chuck Lever | 55aa4f5 | 2005-08-11 16:25:47 -0400 | [diff] [blame] | 2 | * linux/net/sunrpc/clnt.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * This file contains the high-level RPC interface. |
| 5 | * It is modeled as a finite state machine to support both synchronous |
| 6 | * and asynchronous requests. |
| 7 | * |
| 8 | * - RPC header generation and argument serialization. |
| 9 | * - Credential refresh. |
| 10 | * - TCP connect handling. |
| 11 | * - Retry of operation when it is suspected the operation failed because |
| 12 | * of uid squashing on the server, or when the credentials were stale |
| 13 | * and need to be refreshed, or when a packet was damaged in transit. |
| 14 | * This may be have to be moved to the VFS layer. |
| 15 | * |
| 16 | * NB: BSD uses a more intelligent approach to guessing when a request |
| 17 | * or reply has been lost by keeping the RTO estimate for each procedure. |
| 18 | * We currently make do with a constant timeout value. |
| 19 | * |
| 20 | * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com> |
| 21 | * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de> |
| 22 | */ |
| 23 | |
| 24 | #include <asm/system.h> |
| 25 | |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/types.h> |
Chuck Lever | cb3997b | 2008-05-21 17:09:41 -0400 | [diff] [blame] | 28 | #include <linux/kallsyms.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/mm.h> |
Trond Myklebust | 23ac658 | 2009-08-09 15:14:25 -0400 | [diff] [blame] | 30 | #include <linux/namei.h> |
| 31 | #include <linux/mount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/utsname.h> |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 34 | #include <linux/workqueue.h> |
Chuck Lever | 510deb0 | 2007-12-10 14:56:24 -0500 | [diff] [blame] | 35 | #include <linux/in6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | #include <linux/sunrpc/clnt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <linux/sunrpc/rpc_pipe_fs.h> |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 39 | #include <linux/sunrpc/metrics.h> |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 40 | #include <linux/sunrpc/bc_xprt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 42 | #include "sunrpc.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #ifdef RPC_DEBUG |
| 45 | # define RPCDBG_FACILITY RPCDBG_CALL |
| 46 | #endif |
| 47 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 48 | #define dprint_status(t) \ |
| 49 | dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 50 | __func__, t->tk_status) |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 51 | |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 52 | /* |
| 53 | * All RPC clients are linked into this list |
| 54 | */ |
| 55 | static LIST_HEAD(all_clients); |
| 56 | static DEFINE_SPINLOCK(rpc_client_lock); |
| 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
| 59 | |
| 60 | |
| 61 | static void call_start(struct rpc_task *task); |
| 62 | static void call_reserve(struct rpc_task *task); |
| 63 | static void call_reserveresult(struct rpc_task *task); |
| 64 | static void call_allocate(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | static void call_decode(struct rpc_task *task); |
| 66 | static void call_bind(struct rpc_task *task); |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 67 | static void call_bind_status(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | static void call_transmit(struct rpc_task *task); |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 69 | #if defined(CONFIG_NFS_V4_1) |
| 70 | static void call_bc_transmit(struct rpc_task *task); |
| 71 | #endif /* CONFIG_NFS_V4_1 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | static void call_status(struct rpc_task *task); |
Trond Myklebust | 940e331 | 2005-11-09 21:45:24 -0500 | [diff] [blame] | 73 | static void call_transmit_status(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | static void call_refresh(struct rpc_task *task); |
| 75 | static void call_refreshresult(struct rpc_task *task); |
| 76 | static void call_timeout(struct rpc_task *task); |
| 77 | static void call_connect(struct rpc_task *task); |
| 78 | static void call_connect_status(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 80 | static __be32 *rpc_encode_header(struct rpc_task *task); |
| 81 | static __be32 *rpc_verify_header(struct rpc_task *task); |
Chuck Lever | caabea8 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 82 | static int rpc_ping(struct rpc_clnt *clnt); |
Trond Myklebust | 64c91a1 | 2007-06-23 10:17:16 -0400 | [diff] [blame] | 83 | |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 84 | static void rpc_register_client(struct rpc_clnt *clnt) |
| 85 | { |
| 86 | spin_lock(&rpc_client_lock); |
| 87 | list_add(&clnt->cl_clients, &all_clients); |
| 88 | spin_unlock(&rpc_client_lock); |
| 89 | } |
| 90 | |
| 91 | static void rpc_unregister_client(struct rpc_clnt *clnt) |
| 92 | { |
| 93 | spin_lock(&rpc_client_lock); |
| 94 | list_del(&clnt->cl_clients); |
| 95 | spin_unlock(&rpc_client_lock); |
| 96 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
| 98 | static int |
| 99 | rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) |
| 100 | { |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 101 | static uint32_t clntid; |
Trond Myklebust | 23ac658 | 2009-08-09 15:14:25 -0400 | [diff] [blame] | 102 | struct nameidata nd; |
| 103 | struct path path; |
| 104 | char name[15]; |
| 105 | struct qstr q = { |
| 106 | .name = name, |
| 107 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | int error; |
| 109 | |
Trond Myklebust | 7d217ca | 2009-08-09 15:14:24 -0400 | [diff] [blame] | 110 | clnt->cl_path.mnt = ERR_PTR(-ENOENT); |
| 111 | clnt->cl_path.dentry = ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | if (dir_name == NULL) |
| 113 | return 0; |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 114 | |
Trond Myklebust | 23ac658 | 2009-08-09 15:14:25 -0400 | [diff] [blame] | 115 | path.mnt = rpc_get_mount(); |
| 116 | if (IS_ERR(path.mnt)) |
| 117 | return PTR_ERR(path.mnt); |
| 118 | error = vfs_path_lookup(path.mnt->mnt_root, path.mnt, dir_name, 0, &nd); |
| 119 | if (error) |
| 120 | goto err; |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 121 | |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 122 | for (;;) { |
Trond Myklebust | 23ac658 | 2009-08-09 15:14:25 -0400 | [diff] [blame] | 123 | q.len = snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++); |
| 124 | name[sizeof(name) - 1] = '\0'; |
| 125 | q.hash = full_name_hash(q.name, q.len); |
| 126 | path.dentry = rpc_create_client_dir(nd.path.dentry, &q, clnt); |
| 127 | if (!IS_ERR(path.dentry)) |
| 128 | break; |
| 129 | error = PTR_ERR(path.dentry); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 130 | if (error != -EEXIST) { |
Trond Myklebust | 23ac658 | 2009-08-09 15:14:25 -0400 | [diff] [blame] | 131 | printk(KERN_INFO "RPC: Couldn't create pipefs entry" |
| 132 | " %s/%s, error %d\n", |
| 133 | dir_name, name, error); |
| 134 | goto err_path_put; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 135 | } |
Christoph Hellwig | 278c995 | 2005-07-24 23:53:01 +0100 | [diff] [blame] | 136 | } |
Trond Myklebust | 23ac658 | 2009-08-09 15:14:25 -0400 | [diff] [blame] | 137 | path_put(&nd.path); |
| 138 | clnt->cl_path = path; |
| 139 | return 0; |
| 140 | err_path_put: |
| 141 | path_put(&nd.path); |
| 142 | err: |
| 143 | rpc_put_mount(); |
| 144 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | } |
| 146 | |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 147 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | { |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 149 | struct rpc_program *program = args->program; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | struct rpc_version *version; |
| 151 | struct rpc_clnt *clnt = NULL; |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 152 | struct rpc_auth *auth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | int err; |
Chuck Lever | 06b8d25 | 2007-09-11 18:00:20 -0400 | [diff] [blame] | 154 | size_t len; |
| 155 | |
| 156 | /* sanity check the name before trying to print it */ |
| 157 | err = -EINVAL; |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 158 | len = strlen(args->servername); |
Chuck Lever | 06b8d25 | 2007-09-11 18:00:20 -0400 | [diff] [blame] | 159 | if (len > RPC_MAXNETNAMELEN) |
| 160 | goto out_no_rpciod; |
| 161 | len++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 163 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 164 | program->name, args->servername, xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
Trond Myklebust | 4ada539 | 2007-06-14 17:26:17 -0400 | [diff] [blame] | 166 | err = rpciod_up(); |
| 167 | if (err) |
| 168 | goto out_no_rpciod; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | err = -EINVAL; |
| 170 | if (!xprt) |
Adrian Bunk | 712917d | 2006-03-13 21:20:47 -0800 | [diff] [blame] | 171 | goto out_no_xprt; |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 172 | |
| 173 | if (args->version >= program->nrvers) |
| 174 | goto out_err; |
| 175 | version = program->version[args->version]; |
| 176 | if (version == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | goto out_err; |
| 178 | |
| 179 | err = -ENOMEM; |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 180 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | if (!clnt) |
| 182 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | clnt->cl_parent = clnt; |
| 184 | |
| 185 | clnt->cl_server = clnt->cl_inline_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | if (len > sizeof(clnt->cl_inline_name)) { |
| 187 | char *buf = kmalloc(len, GFP_KERNEL); |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 188 | if (buf != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | clnt->cl_server = buf; |
| 190 | else |
| 191 | len = sizeof(clnt->cl_inline_name); |
| 192 | } |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 193 | strlcpy(clnt->cl_server, args->servername, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
| 195 | clnt->cl_xprt = xprt; |
| 196 | clnt->cl_procinfo = version->procs; |
| 197 | clnt->cl_maxproc = version->nrprocs; |
| 198 | clnt->cl_protname = program->name; |
Benny Halevy | d5b337b | 2008-09-28 09:21:26 +0300 | [diff] [blame] | 199 | clnt->cl_prog = args->prognumber ? : program->number; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | clnt->cl_vers = version->number; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | clnt->cl_stats = program->stats; |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 202 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
Trond Myklebust | 23bf85b | 2006-11-21 10:40:23 -0500 | [diff] [blame] | 203 | err = -ENOMEM; |
| 204 | if (clnt->cl_metrics == NULL) |
| 205 | goto out_no_stats; |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 206 | clnt->cl_program = program; |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 207 | INIT_LIST_HEAD(&clnt->cl_tasks); |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 208 | spin_lock_init(&clnt->cl_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 210 | if (!xprt_bound(clnt->cl_xprt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | clnt->cl_autobind = 1; |
| 212 | |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 213 | clnt->cl_timeout = xprt->timeout; |
| 214 | if (args->timeout != NULL) { |
| 215 | memcpy(&clnt->cl_timeout_default, args->timeout, |
| 216 | sizeof(clnt->cl_timeout_default)); |
| 217 | clnt->cl_timeout = &clnt->cl_timeout_default; |
| 218 | } |
| 219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | clnt->cl_rtt = &clnt->cl_rtt_default; |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 221 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
Olga Kornievskaia | 608207e | 2008-12-23 16:17:40 -0500 | [diff] [blame] | 222 | clnt->cl_principal = NULL; |
| 223 | if (args->client_name) { |
| 224 | clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL); |
| 225 | if (!clnt->cl_principal) |
| 226 | goto out_no_principal; |
| 227 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | |
Trond Myklebust | 006abe8 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 229 | atomic_set(&clnt->cl_count, 1); |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 230 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); |
| 232 | if (err < 0) |
| 233 | goto out_no_path; |
| 234 | |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 235 | auth = rpcauth_create(args->authflavor, clnt); |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 236 | if (IS_ERR(auth)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 238 | args->authflavor); |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 239 | err = PTR_ERR(auth); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | goto out_no_auth; |
| 241 | } |
| 242 | |
| 243 | /* save the nodename */ |
Cedric Le Goater | 63ffc23 | 2008-10-03 23:41:51 -0400 | [diff] [blame] | 244 | clnt->cl_nodelen = strlen(init_utsname()->nodename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | if (clnt->cl_nodelen > UNX_MAXNODENAME) |
| 246 | clnt->cl_nodelen = UNX_MAXNODENAME; |
Cedric Le Goater | 63ffc23 | 2008-10-03 23:41:51 -0400 | [diff] [blame] | 247 | memcpy(clnt->cl_nodename, init_utsname()->nodename, clnt->cl_nodelen); |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 248 | rpc_register_client(clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | return clnt; |
| 250 | |
| 251 | out_no_auth: |
Trond Myklebust | 7d217ca | 2009-08-09 15:14:24 -0400 | [diff] [blame] | 252 | if (!IS_ERR(clnt->cl_path.dentry)) { |
| 253 | rpc_remove_client_dir(clnt->cl_path.dentry); |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 254 | rpc_put_mount(); |
| 255 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | out_no_path: |
Olga Kornievskaia | 608207e | 2008-12-23 16:17:40 -0500 | [diff] [blame] | 257 | kfree(clnt->cl_principal); |
| 258 | out_no_principal: |
Trond Myklebust | 23bf85b | 2006-11-21 10:40:23 -0500 | [diff] [blame] | 259 | rpc_free_iostats(clnt->cl_metrics); |
| 260 | out_no_stats: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | if (clnt->cl_server != clnt->cl_inline_name) |
| 262 | kfree(clnt->cl_server); |
| 263 | kfree(clnt); |
| 264 | out_err: |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 265 | xprt_put(xprt); |
Adrian Bunk | 712917d | 2006-03-13 21:20:47 -0800 | [diff] [blame] | 266 | out_no_xprt: |
Trond Myklebust | 4ada539 | 2007-06-14 17:26:17 -0400 | [diff] [blame] | 267 | rpciod_down(); |
| 268 | out_no_rpciod: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | return ERR_PTR(err); |
| 270 | } |
| 271 | |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 272 | /* |
| 273 | * rpc_create - create an RPC client and transport with one call |
| 274 | * @args: rpc_clnt create argument structure |
| 275 | * |
| 276 | * Creates and initializes an RPC transport and an RPC client. |
| 277 | * |
| 278 | * It can ping the server in order to determine if it is up, and to see if |
| 279 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables |
| 280 | * this behavior so asynchronous tasks can also use rpc_create. |
| 281 | */ |
| 282 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) |
| 283 | { |
| 284 | struct rpc_xprt *xprt; |
| 285 | struct rpc_clnt *clnt; |
\"Talpey, Thomas\ | 3c341b0b | 2007-09-10 13:47:07 -0400 | [diff] [blame] | 286 | struct xprt_create xprtargs = { |
Pavel Emelyanov | 9a23e33 | 2010-09-29 16:05:12 +0400 | [diff] [blame] | 287 | .net = args->net, |
\"Talpey, Thomas\ | 4fa016e | 2007-09-10 13:47:57 -0400 | [diff] [blame] | 288 | .ident = args->protocol, |
Frank van Maarseveen | d3bc9a1 | 2007-07-09 22:23:35 +0200 | [diff] [blame] | 289 | .srcaddr = args->saddress, |
Frank van Maarseveen | 96802a0 | 2007-07-08 13:08:54 +0200 | [diff] [blame] | 290 | .dstaddr = args->address, |
| 291 | .addrlen = args->addrsize, |
Alexandros Batsakis | f300bab | 2009-09-10 17:33:30 +0300 | [diff] [blame] | 292 | .bc_xprt = args->bc_xprt, |
Frank van Maarseveen | 96802a0 | 2007-07-08 13:08:54 +0200 | [diff] [blame] | 293 | }; |
Chuck Lever | 510deb0 | 2007-12-10 14:56:24 -0500 | [diff] [blame] | 294 | char servername[48]; |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 295 | |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 296 | /* |
Chuck Lever | 43780b8 | 2007-07-01 12:13:22 -0400 | [diff] [blame] | 297 | * If the caller chooses not to specify a hostname, whip |
| 298 | * up a string representation of the passed-in address. |
| 299 | */ |
| 300 | if (args->servername == NULL) { |
Chuck Lever | 510deb0 | 2007-12-10 14:56:24 -0500 | [diff] [blame] | 301 | servername[0] = '\0'; |
| 302 | switch (args->address->sa_family) { |
| 303 | case AF_INET: { |
| 304 | struct sockaddr_in *sin = |
| 305 | (struct sockaddr_in *)args->address; |
Harvey Harrison | 21454aa | 2008-10-31 00:54:56 -0700 | [diff] [blame] | 306 | snprintf(servername, sizeof(servername), "%pI4", |
| 307 | &sin->sin_addr.s_addr); |
Chuck Lever | 510deb0 | 2007-12-10 14:56:24 -0500 | [diff] [blame] | 308 | break; |
| 309 | } |
| 310 | case AF_INET6: { |
| 311 | struct sockaddr_in6 *sin = |
| 312 | (struct sockaddr_in6 *)args->address; |
Harvey Harrison | 5b095d989 | 2008-10-29 12:52:50 -0700 | [diff] [blame] | 313 | snprintf(servername, sizeof(servername), "%pI6", |
Harvey Harrison | fdb46ee | 2008-10-28 16:10:17 -0700 | [diff] [blame] | 314 | &sin->sin6_addr); |
Chuck Lever | 510deb0 | 2007-12-10 14:56:24 -0500 | [diff] [blame] | 315 | break; |
| 316 | } |
| 317 | default: |
| 318 | /* caller wants default server name, but |
| 319 | * address family isn't recognized. */ |
| 320 | return ERR_PTR(-EINVAL); |
| 321 | } |
Chuck Lever | 43780b8 | 2007-07-01 12:13:22 -0400 | [diff] [blame] | 322 | args->servername = servername; |
| 323 | } |
| 324 | |
Chuck Lever | 510deb0 | 2007-12-10 14:56:24 -0500 | [diff] [blame] | 325 | xprt = xprt_create_transport(&xprtargs); |
| 326 | if (IS_ERR(xprt)) |
| 327 | return (struct rpc_clnt *)xprt; |
| 328 | |
Chuck Lever | 43780b8 | 2007-07-01 12:13:22 -0400 | [diff] [blame] | 329 | /* |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 330 | * By default, kernel RPC client connects from a reserved port. |
| 331 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, |
| 332 | * but it is always enabled for rpciod, which handles the connect |
| 333 | * operation. |
| 334 | */ |
| 335 | xprt->resvport = 1; |
| 336 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) |
| 337 | xprt->resvport = 0; |
| 338 | |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 339 | clnt = rpc_new_client(args, xprt); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 340 | if (IS_ERR(clnt)) |
| 341 | return clnt; |
| 342 | |
| 343 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { |
Chuck Lever | caabea8 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 344 | int err = rpc_ping(clnt); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 345 | if (err != 0) { |
| 346 | rpc_shutdown_client(clnt); |
| 347 | return ERR_PTR(err); |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | clnt->cl_softrtry = 1; |
| 352 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) |
| 353 | clnt->cl_softrtry = 0; |
| 354 | |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 355 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) |
| 356 | clnt->cl_autobind = 1; |
Chuck Lever | 43d78ef | 2007-02-06 18:26:11 -0500 | [diff] [blame] | 357 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
| 358 | clnt->cl_discrtry = 1; |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 359 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) |
| 360 | clnt->cl_chatty = 1; |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 361 | |
| 362 | return clnt; |
| 363 | } |
Chuck Lever | b86acd5 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 364 | EXPORT_SYMBOL_GPL(rpc_create); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | /* |
| 367 | * This function clones the RPC client structure. It allows us to share the |
| 368 | * same transport while varying parameters such as the authentication |
| 369 | * flavour. |
| 370 | */ |
| 371 | struct rpc_clnt * |
| 372 | rpc_clone_client(struct rpc_clnt *clnt) |
| 373 | { |
| 374 | struct rpc_clnt *new; |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 375 | int err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
Arnaldo Carvalho de Melo | e69062b | 2006-11-21 01:21:34 -0200 | [diff] [blame] | 377 | new = kmemdup(clnt, sizeof(*new), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | if (!new) |
| 379 | goto out_no_clnt; |
Trond Myklebust | d431a555 | 2007-06-17 17:07:54 -0400 | [diff] [blame] | 380 | new->cl_parent = clnt; |
| 381 | /* Turn off autobind on clones */ |
| 382 | new->cl_autobind = 0; |
| 383 | INIT_LIST_HEAD(&new->cl_tasks); |
| 384 | spin_lock_init(&new->cl_lock); |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 385 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval); |
Trond Myklebust | 23bf85b | 2006-11-21 10:40:23 -0500 | [diff] [blame] | 386 | new->cl_metrics = rpc_alloc_iostats(clnt); |
| 387 | if (new->cl_metrics == NULL) |
| 388 | goto out_no_stats; |
Olga Kornievskaia | 608207e | 2008-12-23 16:17:40 -0500 | [diff] [blame] | 389 | if (clnt->cl_principal) { |
| 390 | new->cl_principal = kstrdup(clnt->cl_principal, GFP_KERNEL); |
| 391 | if (new->cl_principal == NULL) |
| 392 | goto out_no_principal; |
| 393 | } |
Trond Myklebust | 006abe8 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 394 | atomic_set(&new->cl_count, 1); |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 395 | err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name); |
| 396 | if (err != 0) |
| 397 | goto out_no_path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | if (new->cl_auth) |
| 399 | atomic_inc(&new->cl_auth->au_count); |
Trond Myklebust | d431a555 | 2007-06-17 17:07:54 -0400 | [diff] [blame] | 400 | xprt_get(clnt->cl_xprt); |
Trond Myklebust | 006abe8 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 401 | atomic_inc(&clnt->cl_count); |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 402 | rpc_register_client(new); |
Trond Myklebust | 4ada539 | 2007-06-14 17:26:17 -0400 | [diff] [blame] | 403 | rpciod_up(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | return new; |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 405 | out_no_path: |
Olga Kornievskaia | 608207e | 2008-12-23 16:17:40 -0500 | [diff] [blame] | 406 | kfree(new->cl_principal); |
| 407 | out_no_principal: |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 408 | rpc_free_iostats(new->cl_metrics); |
Trond Myklebust | 23bf85b | 2006-11-21 10:40:23 -0500 | [diff] [blame] | 409 | out_no_stats: |
| 410 | kfree(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | out_no_clnt: |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 412 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 413 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 415 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
| 417 | /* |
Trond Myklebust | 58f9612 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 418 | * Kill all tasks for the given client. |
| 419 | * XXX: kill their descendants as well? |
| 420 | */ |
| 421 | void rpc_killall_tasks(struct rpc_clnt *clnt) |
| 422 | { |
| 423 | struct rpc_task *rovr; |
| 424 | |
| 425 | |
| 426 | if (list_empty(&clnt->cl_tasks)) |
| 427 | return; |
| 428 | dprintk("RPC: killing all tasks for client %p\n", clnt); |
| 429 | /* |
| 430 | * Spin lock all_tasks to prevent changes... |
| 431 | */ |
| 432 | spin_lock(&clnt->cl_lock); |
| 433 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) { |
| 434 | if (!RPC_IS_ACTIVATED(rovr)) |
| 435 | continue; |
| 436 | if (!(rovr->tk_flags & RPC_TASK_KILLED)) { |
| 437 | rovr->tk_flags |= RPC_TASK_KILLED; |
| 438 | rpc_exit(rovr, -EIO); |
| 439 | rpc_wake_up_queued_task(rovr->tk_waitqueue, rovr); |
| 440 | } |
| 441 | } |
| 442 | spin_unlock(&clnt->cl_lock); |
| 443 | } |
| 444 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); |
| 445 | |
| 446 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | * Properly shut down an RPC client, terminating all outstanding |
Trond Myklebust | 90c5755 | 2007-06-09 19:49:36 -0400 | [diff] [blame] | 448 | * requests. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | */ |
Trond Myklebust | 4c402b4 | 2007-06-14 16:40:32 -0400 | [diff] [blame] | 450 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | { |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 452 | dprintk("RPC: shutting down %s client for %s\n", |
| 453 | clnt->cl_protname, clnt->cl_server); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 455 | while (!list_empty(&clnt->cl_tasks)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | rpc_killall_tasks(clnt); |
Ingo Molnar | 532347e | 2006-01-09 20:52:53 -0800 | [diff] [blame] | 457 | wait_event_timeout(destroy_wait, |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 458 | list_empty(&clnt->cl_tasks), 1*HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | } |
| 460 | |
Trond Myklebust | 4c402b4 | 2007-06-14 16:40:32 -0400 | [diff] [blame] | 461 | rpc_release_client(clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 463 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
| 465 | /* |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 466 | * Free an RPC client |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | */ |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 468 | static void |
Trond Myklebust | 006abe8 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 469 | rpc_free_client(struct rpc_clnt *clnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 471 | dprintk("RPC: destroying %s client for %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | clnt->cl_protname, clnt->cl_server); |
Trond Myklebust | 7d217ca | 2009-08-09 15:14:24 -0400 | [diff] [blame] | 473 | if (!IS_ERR(clnt->cl_path.dentry)) { |
| 474 | rpc_remove_client_dir(clnt->cl_path.dentry); |
Trond Myklebust | 8f8e7a5 | 2006-08-14 13:11:15 -0400 | [diff] [blame] | 475 | rpc_put_mount(); |
| 476 | } |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 477 | if (clnt->cl_parent != clnt) { |
Trond Myklebust | 8ad7c89 | 2007-06-14 16:40:32 -0400 | [diff] [blame] | 478 | rpc_release_client(clnt->cl_parent); |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 479 | goto out_free; |
| 480 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | if (clnt->cl_server != clnt->cl_inline_name) |
| 482 | kfree(clnt->cl_server); |
| 483 | out_free: |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 484 | rpc_unregister_client(clnt); |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 485 | rpc_free_iostats(clnt->cl_metrics); |
Olga Kornievskaia | 608207e | 2008-12-23 16:17:40 -0500 | [diff] [blame] | 486 | kfree(clnt->cl_principal); |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 487 | clnt->cl_metrics = NULL; |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 488 | xprt_put(clnt->cl_xprt); |
Trond Myklebust | 4ada539 | 2007-06-14 17:26:17 -0400 | [diff] [blame] | 489 | rpciod_down(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | kfree(clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | } |
| 492 | |
| 493 | /* |
Trond Myklebust | 1dd17ec | 2007-06-26 16:57:41 -0400 | [diff] [blame] | 494 | * Free an RPC client |
| 495 | */ |
| 496 | static void |
Trond Myklebust | 006abe8 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 497 | rpc_free_auth(struct rpc_clnt *clnt) |
Trond Myklebust | 1dd17ec | 2007-06-26 16:57:41 -0400 | [diff] [blame] | 498 | { |
Trond Myklebust | 1dd17ec | 2007-06-26 16:57:41 -0400 | [diff] [blame] | 499 | if (clnt->cl_auth == NULL) { |
Trond Myklebust | 006abe8 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 500 | rpc_free_client(clnt); |
Trond Myklebust | 1dd17ec | 2007-06-26 16:57:41 -0400 | [diff] [blame] | 501 | return; |
| 502 | } |
| 503 | |
| 504 | /* |
| 505 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to |
| 506 | * release remaining GSS contexts. This mechanism ensures |
| 507 | * that it can do so safely. |
| 508 | */ |
Trond Myklebust | 006abe8 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 509 | atomic_inc(&clnt->cl_count); |
Trond Myklebust | 1dd17ec | 2007-06-26 16:57:41 -0400 | [diff] [blame] | 510 | rpcauth_release(clnt->cl_auth); |
| 511 | clnt->cl_auth = NULL; |
Trond Myklebust | 006abe8 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 512 | if (atomic_dec_and_test(&clnt->cl_count)) |
| 513 | rpc_free_client(clnt); |
Trond Myklebust | 1dd17ec | 2007-06-26 16:57:41 -0400 | [diff] [blame] | 514 | } |
| 515 | |
| 516 | /* |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 517 | * Release reference to the RPC client |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | */ |
| 519 | void |
| 520 | rpc_release_client(struct rpc_clnt *clnt) |
| 521 | { |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 522 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 524 | if (list_empty(&clnt->cl_tasks)) |
| 525 | wake_up(&destroy_wait); |
Trond Myklebust | 006abe8 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 526 | if (atomic_dec_and_test(&clnt->cl_count)) |
| 527 | rpc_free_auth(clnt); |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 528 | } |
| 529 | |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 530 | /** |
| 531 | * rpc_bind_new_program - bind a new RPC program to an existing client |
Randy Dunlap | 65b6e42 | 2008-02-13 15:03:23 -0800 | [diff] [blame] | 532 | * @old: old rpc_client |
| 533 | * @program: rpc program to set |
| 534 | * @vers: rpc program version |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 535 | * |
| 536 | * Clones the rpc client and sets up a new RPC program. This is mainly |
| 537 | * of use for enabling different RPC programs to share the same transport. |
| 538 | * The Sun NFSv2/v3 ACL protocol can do this. |
| 539 | */ |
| 540 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, |
| 541 | struct rpc_program *program, |
Chuck Lever | 89eb21c | 2007-09-11 18:00:09 -0400 | [diff] [blame] | 542 | u32 vers) |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 543 | { |
| 544 | struct rpc_clnt *clnt; |
| 545 | struct rpc_version *version; |
| 546 | int err; |
| 547 | |
| 548 | BUG_ON(vers >= program->nrvers || !program->version[vers]); |
| 549 | version = program->version[vers]; |
| 550 | clnt = rpc_clone_client(old); |
| 551 | if (IS_ERR(clnt)) |
| 552 | goto out; |
| 553 | clnt->cl_procinfo = version->procs; |
| 554 | clnt->cl_maxproc = version->nrprocs; |
| 555 | clnt->cl_protname = program->name; |
| 556 | clnt->cl_prog = program->number; |
| 557 | clnt->cl_vers = version->number; |
| 558 | clnt->cl_stats = program->stats; |
Chuck Lever | caabea8 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 559 | err = rpc_ping(clnt); |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 560 | if (err != 0) { |
| 561 | rpc_shutdown_client(clnt); |
| 562 | clnt = ERR_PTR(err); |
| 563 | } |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 564 | out: |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 565 | return clnt; |
| 566 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 567 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 568 | |
Trond Myklebust | 58f9612 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 569 | void rpc_task_release_client(struct rpc_task *task) |
| 570 | { |
| 571 | struct rpc_clnt *clnt = task->tk_client; |
| 572 | |
| 573 | if (clnt != NULL) { |
| 574 | /* Remove from client task list */ |
| 575 | spin_lock(&clnt->cl_lock); |
| 576 | list_del(&task->tk_task); |
| 577 | spin_unlock(&clnt->cl_lock); |
| 578 | task->tk_client = NULL; |
| 579 | |
| 580 | rpc_release_client(clnt); |
| 581 | } |
| 582 | } |
| 583 | |
| 584 | static |
| 585 | void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) |
| 586 | { |
| 587 | if (clnt != NULL) { |
| 588 | rpc_task_release_client(task); |
| 589 | task->tk_client = clnt; |
Trond Myklebust | 006abe8 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 590 | atomic_inc(&clnt->cl_count); |
Trond Myklebust | 58f9612 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 591 | if (clnt->cl_softrtry) |
| 592 | task->tk_flags |= RPC_TASK_SOFT; |
| 593 | /* Add to the client's list of all tasks */ |
| 594 | spin_lock(&clnt->cl_lock); |
| 595 | list_add_tail(&task->tk_task, &clnt->cl_tasks); |
| 596 | spin_unlock(&clnt->cl_lock); |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | static void |
| 601 | rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) |
| 602 | { |
| 603 | if (msg != NULL) { |
| 604 | task->tk_msg.rpc_proc = msg->rpc_proc; |
| 605 | task->tk_msg.rpc_argp = msg->rpc_argp; |
| 606 | task->tk_msg.rpc_resp = msg->rpc_resp; |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 607 | if (msg->rpc_cred != NULL) |
| 608 | task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred); |
Trond Myklebust | 58f9612 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 609 | } |
| 610 | } |
| 611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | /* |
| 613 | * Default callback for async RPC calls |
| 614 | */ |
| 615 | static void |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 616 | rpc_default_callback(struct rpc_task *task, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | { |
| 618 | } |
| 619 | |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 620 | static const struct rpc_call_ops rpc_default_ops = { |
| 621 | .rpc_call_done = rpc_default_callback, |
| 622 | }; |
| 623 | |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 624 | /** |
| 625 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it |
| 626 | * @task_setup_data: pointer to task initialisation data |
| 627 | */ |
| 628 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 629 | { |
Trond Myklebust | 19445b9 | 2010-04-16 16:41:10 -0400 | [diff] [blame] | 630 | struct rpc_task *task; |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 631 | |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 632 | task = rpc_new_task(task_setup_data); |
Trond Myklebust | 19445b9 | 2010-04-16 16:41:10 -0400 | [diff] [blame] | 633 | if (IS_ERR(task)) |
Trond Myklebust | 5085925 | 2007-10-25 18:19:37 -0400 | [diff] [blame] | 634 | goto out; |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 635 | |
Trond Myklebust | 58f9612 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 636 | rpc_task_set_client(task, task_setup_data->rpc_client); |
| 637 | rpc_task_set_rpc_message(task, task_setup_data->rpc_message); |
| 638 | |
| 639 | if (task->tk_status != 0) { |
| 640 | int ret = task->tk_status; |
| 641 | rpc_put_task(task); |
| 642 | return ERR_PTR(ret); |
| 643 | } |
| 644 | |
| 645 | if (task->tk_action == NULL) |
| 646 | rpc_call_start(task); |
| 647 | |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 648 | atomic_inc(&task->tk_count); |
| 649 | rpc_execute(task); |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 650 | out: |
Trond Myklebust | 19445b9 | 2010-04-16 16:41:10 -0400 | [diff] [blame] | 651 | return task; |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 652 | } |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 653 | EXPORT_SYMBOL_GPL(rpc_run_task); |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 654 | |
| 655 | /** |
| 656 | * rpc_call_sync - Perform a synchronous RPC call |
| 657 | * @clnt: pointer to RPC client |
| 658 | * @msg: RPC call parameters |
| 659 | * @flags: RPC call flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | */ |
Trond Myklebust | cbc2005 | 2008-02-14 11:11:30 -0500 | [diff] [blame] | 661 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | { |
| 663 | struct rpc_task *task; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 664 | struct rpc_task_setup task_setup_data = { |
| 665 | .rpc_client = clnt, |
| 666 | .rpc_message = msg, |
| 667 | .callback_ops = &rpc_default_ops, |
| 668 | .flags = flags, |
| 669 | }; |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 670 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | BUG_ON(flags & RPC_TASK_ASYNC); |
| 673 | |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 674 | task = rpc_run_task(&task_setup_data); |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 675 | if (IS_ERR(task)) |
| 676 | return PTR_ERR(task); |
Trond Myklebust | e60859a | 2006-01-03 09:55:10 +0100 | [diff] [blame] | 677 | status = task->tk_status; |
Trond Myklebust | bde8f00 | 2007-01-24 11:54:53 -0800 | [diff] [blame] | 678 | rpc_put_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | return status; |
| 680 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 681 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 683 | /** |
| 684 | * rpc_call_async - Perform an asynchronous RPC call |
| 685 | * @clnt: pointer to RPC client |
| 686 | * @msg: RPC call parameters |
| 687 | * @flags: RPC call flags |
Randy Dunlap | 65b6e42 | 2008-02-13 15:03:23 -0800 | [diff] [blame] | 688 | * @tk_ops: RPC call ops |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 689 | * @data: user call data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | */ |
| 691 | int |
Trond Myklebust | cbc2005 | 2008-02-14 11:11:30 -0500 | [diff] [blame] | 692 | rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 693 | const struct rpc_call_ops *tk_ops, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | { |
| 695 | struct rpc_task *task; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 696 | struct rpc_task_setup task_setup_data = { |
| 697 | .rpc_client = clnt, |
| 698 | .rpc_message = msg, |
| 699 | .callback_ops = tk_ops, |
| 700 | .callback_data = data, |
| 701 | .flags = flags|RPC_TASK_ASYNC, |
| 702 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 704 | task = rpc_run_task(&task_setup_data); |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 705 | if (IS_ERR(task)) |
| 706 | return PTR_ERR(task); |
| 707 | rpc_put_task(task); |
| 708 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 710 | EXPORT_SYMBOL_GPL(rpc_call_async); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 712 | #if defined(CONFIG_NFS_V4_1) |
| 713 | /** |
| 714 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run |
| 715 | * rpc_execute against it |
Jaswinder Singh Rajput | 7a73fdd | 2009-09-24 14:58:42 -0400 | [diff] [blame] | 716 | * @req: RPC request |
| 717 | * @tk_ops: RPC call ops |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 718 | */ |
| 719 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req, |
Jaswinder Singh Rajput | 7a73fdd | 2009-09-24 14:58:42 -0400 | [diff] [blame] | 720 | const struct rpc_call_ops *tk_ops) |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 721 | { |
| 722 | struct rpc_task *task; |
| 723 | struct xdr_buf *xbufp = &req->rq_snd_buf; |
| 724 | struct rpc_task_setup task_setup_data = { |
| 725 | .callback_ops = tk_ops, |
| 726 | }; |
| 727 | |
| 728 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); |
| 729 | /* |
| 730 | * Create an rpc_task to send the data |
| 731 | */ |
| 732 | task = rpc_new_task(&task_setup_data); |
Trond Myklebust | 19445b9 | 2010-04-16 16:41:10 -0400 | [diff] [blame] | 733 | if (IS_ERR(task)) { |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 734 | xprt_free_bc_request(req); |
| 735 | goto out; |
| 736 | } |
| 737 | task->tk_rqstp = req; |
| 738 | |
| 739 | /* |
| 740 | * Set up the xdr_buf length. |
| 741 | * This also indicates that the buffer is XDR encoded already. |
| 742 | */ |
| 743 | xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + |
| 744 | xbufp->tail[0].iov_len; |
| 745 | |
| 746 | task->tk_action = call_bc_transmit; |
| 747 | atomic_inc(&task->tk_count); |
| 748 | BUG_ON(atomic_read(&task->tk_count) != 2); |
| 749 | rpc_execute(task); |
| 750 | |
| 751 | out: |
| 752 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); |
| 753 | return task; |
| 754 | } |
| 755 | #endif /* CONFIG_NFS_V4_1 */ |
| 756 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | void |
Trond Myklebust | 77de2c5 | 2007-10-25 18:40:21 -0400 | [diff] [blame] | 758 | rpc_call_start(struct rpc_task *task) |
| 759 | { |
| 760 | task->tk_action = call_start; |
| 761 | } |
| 762 | EXPORT_SYMBOL_GPL(rpc_call_start); |
| 763 | |
Chuck Lever | ed39440 | 2006-08-22 20:06:17 -0400 | [diff] [blame] | 764 | /** |
| 765 | * rpc_peeraddr - extract remote peer address from clnt's xprt |
| 766 | * @clnt: RPC client structure |
| 767 | * @buf: target buffer |
Randy Dunlap | 65b6e42 | 2008-02-13 15:03:23 -0800 | [diff] [blame] | 768 | * @bufsize: length of target buffer |
Chuck Lever | ed39440 | 2006-08-22 20:06:17 -0400 | [diff] [blame] | 769 | * |
| 770 | * Returns the number of bytes that are actually in the stored address. |
| 771 | */ |
| 772 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) |
| 773 | { |
| 774 | size_t bytes; |
| 775 | struct rpc_xprt *xprt = clnt->cl_xprt; |
| 776 | |
| 777 | bytes = sizeof(xprt->addr); |
| 778 | if (bytes > bufsize) |
| 779 | bytes = bufsize; |
| 780 | memcpy(buf, &clnt->cl_xprt->addr, bytes); |
Chuck Lever | c4efcb1 | 2006-08-22 20:06:19 -0400 | [diff] [blame] | 781 | return xprt->addrlen; |
Chuck Lever | ed39440 | 2006-08-22 20:06:17 -0400 | [diff] [blame] | 782 | } |
Chuck Lever | b86acd5 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 783 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
Chuck Lever | ed39440 | 2006-08-22 20:06:17 -0400 | [diff] [blame] | 784 | |
Chuck Lever | f425eba | 2006-08-22 20:06:18 -0400 | [diff] [blame] | 785 | /** |
| 786 | * rpc_peeraddr2str - return remote peer address in printable format |
| 787 | * @clnt: RPC client structure |
| 788 | * @format: address format |
| 789 | * |
| 790 | */ |
Chuck Lever | b454ae9 | 2008-01-07 18:34:48 -0500 | [diff] [blame] | 791 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
| 792 | enum rpc_display_format_t format) |
Chuck Lever | f425eba | 2006-08-22 20:06:18 -0400 | [diff] [blame] | 793 | { |
| 794 | struct rpc_xprt *xprt = clnt->cl_xprt; |
Chuck Lever | 7559c7a | 2006-12-05 16:35:37 -0500 | [diff] [blame] | 795 | |
| 796 | if (xprt->address_strings[format] != NULL) |
| 797 | return xprt->address_strings[format]; |
| 798 | else |
| 799 | return "unprintable"; |
Chuck Lever | f425eba | 2006-08-22 20:06:18 -0400 | [diff] [blame] | 800 | } |
Chuck Lever | b86acd5 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 801 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
Chuck Lever | f425eba | 2006-08-22 20:06:18 -0400 | [diff] [blame] | 802 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | void |
| 804 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) |
| 805 | { |
| 806 | struct rpc_xprt *xprt = clnt->cl_xprt; |
Chuck Lever | 470056c | 2005-08-25 16:25:56 -0700 | [diff] [blame] | 807 | if (xprt->ops->set_buffer_size) |
| 808 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 810 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | |
| 812 | /* |
| 813 | * Return size of largest payload RPC client can support, in bytes |
| 814 | * |
| 815 | * For stream transports, this is one RPC record fragment (see RFC |
| 816 | * 1831), as we don't support multi-record requests yet. For datagram |
| 817 | * transports, this is the size of an IP packet minus the IP, UDP, and |
| 818 | * RPC header sizes. |
| 819 | */ |
| 820 | size_t rpc_max_payload(struct rpc_clnt *clnt) |
| 821 | { |
| 822 | return clnt->cl_xprt->max_payload; |
| 823 | } |
Chuck Lever | b86acd5 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 824 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 826 | /** |
| 827 | * rpc_force_rebind - force transport to check that remote port is unchanged |
| 828 | * @clnt: client to rebind |
| 829 | * |
| 830 | */ |
| 831 | void rpc_force_rebind(struct rpc_clnt *clnt) |
| 832 | { |
| 833 | if (clnt->cl_autobind) |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 834 | xprt_clear_bound(clnt->cl_xprt); |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 835 | } |
Chuck Lever | b86acd5 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 836 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 837 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | /* |
Andy Adamson | aae2006 | 2009-04-01 09:22:40 -0400 | [diff] [blame] | 839 | * Restart an (async) RPC call from the call_prepare state. |
| 840 | * Usually called from within the exit handler. |
| 841 | */ |
Trond Myklebust | f1f88fc | 2010-07-31 14:29:07 -0400 | [diff] [blame] | 842 | int |
Andy Adamson | aae2006 | 2009-04-01 09:22:40 -0400 | [diff] [blame] | 843 | rpc_restart_call_prepare(struct rpc_task *task) |
| 844 | { |
| 845 | if (RPC_ASSASSINATED(task)) |
Trond Myklebust | f1f88fc | 2010-07-31 14:29:07 -0400 | [diff] [blame] | 846 | return 0; |
Andy Adamson | aae2006 | 2009-04-01 09:22:40 -0400 | [diff] [blame] | 847 | task->tk_action = rpc_prepare_task; |
Trond Myklebust | f1f88fc | 2010-07-31 14:29:07 -0400 | [diff] [blame] | 848 | return 1; |
Andy Adamson | aae2006 | 2009-04-01 09:22:40 -0400 | [diff] [blame] | 849 | } |
| 850 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); |
| 851 | |
| 852 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | * Restart an (async) RPC call. Usually called from within the |
| 854 | * exit handler. |
| 855 | */ |
Trond Myklebust | f1f88fc | 2010-07-31 14:29:07 -0400 | [diff] [blame] | 856 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | rpc_restart_call(struct rpc_task *task) |
| 858 | { |
| 859 | if (RPC_ASSASSINATED(task)) |
Trond Myklebust | f1f88fc | 2010-07-31 14:29:07 -0400 | [diff] [blame] | 860 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | task->tk_action = call_start; |
Trond Myklebust | f1f88fc | 2010-07-31 14:29:07 -0400 | [diff] [blame] | 862 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 864 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | |
Chuck Lever | 3748f1e | 2008-05-21 17:09:12 -0400 | [diff] [blame] | 866 | #ifdef RPC_DEBUG |
| 867 | static const char *rpc_proc_name(const struct rpc_task *task) |
| 868 | { |
| 869 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
| 870 | |
| 871 | if (proc) { |
| 872 | if (proc->p_name) |
| 873 | return proc->p_name; |
| 874 | else |
| 875 | return "NULL"; |
| 876 | } else |
| 877 | return "no proc"; |
| 878 | } |
| 879 | #endif |
| 880 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | /* |
| 882 | * 0. Initial state |
| 883 | * |
| 884 | * Other FSM states can be visited zero or more times, but |
| 885 | * this state is visited exactly once for each RPC. |
| 886 | */ |
| 887 | static void |
| 888 | call_start(struct rpc_task *task) |
| 889 | { |
| 890 | struct rpc_clnt *clnt = task->tk_client; |
| 891 | |
Chuck Lever | 3748f1e | 2008-05-21 17:09:12 -0400 | [diff] [blame] | 892 | dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid, |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 893 | clnt->cl_protname, clnt->cl_vers, |
Chuck Lever | 3748f1e | 2008-05-21 17:09:12 -0400 | [diff] [blame] | 894 | rpc_proc_name(task), |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 895 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | |
| 897 | /* Increment call count */ |
| 898 | task->tk_msg.rpc_proc->p_count++; |
| 899 | clnt->cl_stats->rpccnt++; |
| 900 | task->tk_action = call_reserve; |
| 901 | } |
| 902 | |
| 903 | /* |
| 904 | * 1. Reserve an RPC call slot |
| 905 | */ |
| 906 | static void |
| 907 | call_reserve(struct rpc_task *task) |
| 908 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 909 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | task->tk_status = 0; |
| 912 | task->tk_action = call_reserveresult; |
| 913 | xprt_reserve(task); |
| 914 | } |
| 915 | |
| 916 | /* |
| 917 | * 1b. Grok the result of xprt_reserve() |
| 918 | */ |
| 919 | static void |
| 920 | call_reserveresult(struct rpc_task *task) |
| 921 | { |
| 922 | int status = task->tk_status; |
| 923 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 924 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | |
| 926 | /* |
| 927 | * After a call to xprt_reserve(), we must have either |
| 928 | * a request slot or else an error status. |
| 929 | */ |
| 930 | task->tk_status = 0; |
| 931 | if (status >= 0) { |
| 932 | if (task->tk_rqstp) { |
J. Bruce Fields | f2d47d0 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 933 | task->tk_action = call_refresh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | return; |
| 935 | } |
| 936 | |
| 937 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 938 | __func__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | rpc_exit(task, -EIO); |
| 940 | return; |
| 941 | } |
| 942 | |
| 943 | /* |
| 944 | * Even though there was an error, we may have acquired |
| 945 | * a request slot somehow. Make sure not to leak it. |
| 946 | */ |
| 947 | if (task->tk_rqstp) { |
| 948 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 949 | __func__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | xprt_release(task); |
| 951 | } |
| 952 | |
| 953 | switch (status) { |
| 954 | case -EAGAIN: /* woken up; retry */ |
| 955 | task->tk_action = call_reserve; |
| 956 | return; |
| 957 | case -EIO: /* probably a shutdown */ |
| 958 | break; |
| 959 | default: |
| 960 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 961 | __func__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | break; |
| 963 | } |
| 964 | rpc_exit(task, status); |
| 965 | } |
| 966 | |
| 967 | /* |
J. Bruce Fields | 5557624 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 968 | * 2. Bind and/or refresh the credentials |
| 969 | */ |
| 970 | static void |
| 971 | call_refresh(struct rpc_task *task) |
| 972 | { |
| 973 | dprint_status(task); |
| 974 | |
| 975 | task->tk_action = call_refreshresult; |
| 976 | task->tk_status = 0; |
| 977 | task->tk_client->cl_stats->rpcauthrefresh++; |
| 978 | rpcauth_refreshcred(task); |
| 979 | } |
| 980 | |
| 981 | /* |
| 982 | * 2a. Process the results of a credential refresh |
| 983 | */ |
| 984 | static void |
| 985 | call_refreshresult(struct rpc_task *task) |
| 986 | { |
| 987 | int status = task->tk_status; |
| 988 | |
| 989 | dprint_status(task); |
| 990 | |
| 991 | task->tk_status = 0; |
| 992 | task->tk_action = call_allocate; |
| 993 | if (status >= 0 && rpcauth_uptodatecred(task)) |
| 994 | return; |
| 995 | switch (status) { |
| 996 | case -EACCES: |
| 997 | rpc_exit(task, -EACCES); |
| 998 | return; |
| 999 | case -ENOMEM: |
| 1000 | rpc_exit(task, -ENOMEM); |
| 1001 | return; |
| 1002 | case -ETIMEDOUT: |
| 1003 | rpc_delay(task, 3*HZ); |
| 1004 | } |
| 1005 | task->tk_action = call_refresh; |
| 1006 | } |
| 1007 | |
| 1008 | /* |
| 1009 | * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 1010 | * (Note: buffer memory is freed in xprt_release). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | */ |
| 1012 | static void |
| 1013 | call_allocate(struct rpc_task *task) |
| 1014 | { |
J. Bruce Fields | f2d47d0 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 1015 | unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack; |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 1016 | struct rpc_rqst *req = task->tk_rqstp; |
| 1017 | struct rpc_xprt *xprt = task->tk_xprt; |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 1018 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1020 | dprint_status(task); |
| 1021 | |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 1022 | task->tk_status = 0; |
J. Bruce Fields | f2d47d0 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 1023 | task->tk_action = call_bind; |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 1024 | |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 1025 | if (req->rq_buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | return; |
| 1027 | |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 1028 | if (proc->p_proc != 0) { |
| 1029 | BUG_ON(proc->p_arglen == 0); |
| 1030 | if (proc->p_decode != NULL) |
| 1031 | BUG_ON(proc->p_replen == 0); |
| 1032 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 1034 | /* |
| 1035 | * Calculate the size (in quads) of the RPC call |
| 1036 | * and reply headers, and convert both values |
| 1037 | * to byte sizes. |
| 1038 | */ |
| 1039 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; |
| 1040 | req->rq_callsize <<= 2; |
| 1041 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; |
| 1042 | req->rq_rcvsize <<= 2; |
| 1043 | |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 1044 | req->rq_buffer = xprt->ops->buf_alloc(task, |
| 1045 | req->rq_callsize + req->rq_rcvsize); |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 1046 | if (req->rq_buffer != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | return; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1048 | |
| 1049 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | |
Trond Myklebust | 14b218a | 2005-06-22 17:16:28 +0000 | [diff] [blame] | 1051 | if (RPC_IS_ASYNC(task) || !signalled()) { |
Trond Myklebust | b6e9c71 | 2007-10-01 12:06:44 -0400 | [diff] [blame] | 1052 | task->tk_action = call_allocate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | rpc_delay(task, HZ>>4); |
| 1054 | return; |
| 1055 | } |
| 1056 | |
| 1057 | rpc_exit(task, -ERESTARTSYS); |
| 1058 | } |
| 1059 | |
Trond Myklebust | 940e331 | 2005-11-09 21:45:24 -0500 | [diff] [blame] | 1060 | static inline int |
| 1061 | rpc_task_need_encode(struct rpc_task *task) |
| 1062 | { |
| 1063 | return task->tk_rqstp->rq_snd_buf.len == 0; |
| 1064 | } |
| 1065 | |
| 1066 | static inline void |
| 1067 | rpc_task_force_reencode(struct rpc_task *task) |
| 1068 | { |
| 1069 | task->tk_rqstp->rq_snd_buf.len = 0; |
Trond Myklebust | 2574cc9 | 2009-08-28 11:12:12 -0400 | [diff] [blame] | 1070 | task->tk_rqstp->rq_bytes_sent = 0; |
Trond Myklebust | 940e331 | 2005-11-09 21:45:24 -0500 | [diff] [blame] | 1071 | } |
| 1072 | |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 1073 | static inline void |
| 1074 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) |
| 1075 | { |
| 1076 | buf->head[0].iov_base = start; |
| 1077 | buf->head[0].iov_len = len; |
| 1078 | buf->tail[0].iov_len = 0; |
| 1079 | buf->page_len = 0; |
\"Talpey, Thomas\ | 4f22ccc | 2007-09-10 13:44:58 -0400 | [diff] [blame] | 1080 | buf->flags = 0; |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 1081 | buf->len = 0; |
| 1082 | buf->buflen = len; |
| 1083 | } |
| 1084 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | /* |
| 1086 | * 3. Encode arguments of an RPC call |
| 1087 | */ |
| 1088 | static void |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1089 | rpc_xdr_encode(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | struct rpc_rqst *req = task->tk_rqstp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | kxdrproc_t encode; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1093 | __be32 *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1095 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 1097 | rpc_xdr_buf_init(&req->rq_snd_buf, |
| 1098 | req->rq_buffer, |
| 1099 | req->rq_callsize); |
| 1100 | rpc_xdr_buf_init(&req->rq_rcv_buf, |
| 1101 | (char *)req->rq_buffer + req->rq_callsize, |
| 1102 | req->rq_rcvsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1104 | p = rpc_encode_header(task); |
| 1105 | if (p == NULL) { |
| 1106 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | rpc_exit(task, -EIO); |
| 1108 | return; |
| 1109 | } |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1110 | |
| 1111 | encode = task->tk_msg.rpc_proc->p_encode; |
J. Bruce Fields | f368031 | 2005-10-13 16:54:48 -0400 | [diff] [blame] | 1112 | if (encode == NULL) |
| 1113 | return; |
| 1114 | |
| 1115 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, |
| 1116 | task->tk_msg.rpc_argp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | } |
| 1118 | |
| 1119 | /* |
| 1120 | * 4. Get the server port number if not yet set |
| 1121 | */ |
| 1122 | static void |
| 1123 | call_bind(struct rpc_task *task) |
| 1124 | { |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 1125 | struct rpc_xprt *xprt = task->tk_xprt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1127 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1129 | task->tk_action = call_connect; |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 1130 | if (!xprt_bound(xprt)) { |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1131 | task->tk_action = call_bind_status; |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 1132 | task->tk_timeout = xprt->bind_timeout; |
Chuck Lever | bbf7c1d | 2006-08-22 20:06:16 -0400 | [diff] [blame] | 1133 | xprt->ops->rpcbind(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | } |
| 1135 | } |
| 1136 | |
| 1137 | /* |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1138 | * 4a. Sort out bind result |
| 1139 | */ |
| 1140 | static void |
| 1141 | call_bind_status(struct rpc_task *task) |
| 1142 | { |
Chuck Lever | 906462a | 2007-09-11 18:00:47 -0400 | [diff] [blame] | 1143 | int status = -EIO; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1144 | |
| 1145 | if (task->tk_status >= 0) { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1146 | dprint_status(task); |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1147 | task->tk_status = 0; |
| 1148 | task->tk_action = call_connect; |
| 1149 | return; |
| 1150 | } |
| 1151 | |
| 1152 | switch (task->tk_status) { |
Trond Myklebust | 381ba74 | 2008-07-07 12:18:53 -0400 | [diff] [blame] | 1153 | case -ENOMEM: |
| 1154 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); |
| 1155 | rpc_delay(task, HZ >> 2); |
Chuck Lever | 2429cbf | 2007-09-11 18:00:41 -0400 | [diff] [blame] | 1156 | goto retry_timeout; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1157 | case -EACCES: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1158 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
| 1159 | "unavailable\n", task->tk_pid); |
Chuck Lever | b79dc8c | 2007-09-11 18:00:52 -0400 | [diff] [blame] | 1160 | /* fail immediately if this is an RPC ping */ |
| 1161 | if (task->tk_msg.rpc_proc->p_proc == 0) { |
| 1162 | status = -EOPNOTSUPP; |
| 1163 | break; |
| 1164 | } |
Chuck Lever | ea635a5 | 2005-10-06 23:12:58 -0400 | [diff] [blame] | 1165 | rpc_delay(task, 3*HZ); |
Trond Myklebust | da45828 | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 1166 | goto retry_timeout; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1167 | case -ETIMEDOUT: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1168 | dprintk("RPC: %5u rpcbind request timed out\n", |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1169 | task->tk_pid); |
Trond Myklebust | da45828 | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 1170 | goto retry_timeout; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1171 | case -EPFNOSUPPORT: |
Chuck Lever | 906462a | 2007-09-11 18:00:47 -0400 | [diff] [blame] | 1172 | /* server doesn't support any rpcbind version we know of */ |
Chuck Lever | 012da15 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1173 | dprintk("RPC: %5u unrecognized remote rpcbind service\n", |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1174 | task->tk_pid); |
| 1175 | break; |
| 1176 | case -EPROTONOSUPPORT: |
Chuck Lever | 00a6e7b | 2007-03-29 16:48:33 -0400 | [diff] [blame] | 1177 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1178 | task->tk_pid); |
Chuck Lever | 00a6e7b | 2007-03-29 16:48:33 -0400 | [diff] [blame] | 1179 | task->tk_status = 0; |
| 1180 | task->tk_action = call_bind; |
| 1181 | return; |
Chuck Lever | 012da15 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1182 | case -ECONNREFUSED: /* connection problems */ |
| 1183 | case -ECONNRESET: |
| 1184 | case -ENOTCONN: |
| 1185 | case -EHOSTDOWN: |
| 1186 | case -EHOSTUNREACH: |
| 1187 | case -ENETUNREACH: |
| 1188 | case -EPIPE: |
| 1189 | dprintk("RPC: %5u remote rpcbind unreachable: %d\n", |
| 1190 | task->tk_pid, task->tk_status); |
| 1191 | if (!RPC_IS_SOFTCONN(task)) { |
| 1192 | rpc_delay(task, 5*HZ); |
| 1193 | goto retry_timeout; |
| 1194 | } |
| 1195 | status = task->tk_status; |
| 1196 | break; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1197 | default: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1198 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1199 | task->tk_pid, -task->tk_status); |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1200 | } |
| 1201 | |
| 1202 | rpc_exit(task, status); |
| 1203 | return; |
| 1204 | |
Trond Myklebust | da45828 | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 1205 | retry_timeout: |
| 1206 | task->tk_action = call_timeout; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1207 | } |
| 1208 | |
| 1209 | /* |
| 1210 | * 4b. Connect to the RPC server |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | */ |
| 1212 | static void |
| 1213 | call_connect(struct rpc_task *task) |
| 1214 | { |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1215 | struct rpc_xprt *xprt = task->tk_xprt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1217 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1218 | task->tk_pid, xprt, |
| 1219 | (xprt_connected(xprt) ? "is" : "is not")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1221 | task->tk_action = call_transmit; |
| 1222 | if (!xprt_connected(xprt)) { |
| 1223 | task->tk_action = call_connect_status; |
| 1224 | if (task->tk_status < 0) |
| 1225 | return; |
| 1226 | xprt_connect(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | } |
| 1229 | |
| 1230 | /* |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1231 | * 4c. Sort out connect result |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | */ |
| 1233 | static void |
| 1234 | call_connect_status(struct rpc_task *task) |
| 1235 | { |
| 1236 | struct rpc_clnt *clnt = task->tk_client; |
| 1237 | int status = task->tk_status; |
| 1238 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1239 | dprint_status(task); |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | task->tk_status = 0; |
Trond Myklebust | 2a49199 | 2009-03-11 14:38:00 -0400 | [diff] [blame] | 1242 | if (status >= 0 || status == -EAGAIN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | clnt->cl_stats->netreconn++; |
| 1244 | task->tk_action = call_transmit; |
| 1245 | return; |
| 1246 | } |
| 1247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | switch (status) { |
Trond Myklebust | da45828 | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 1249 | /* if soft mounted, test if we've timed out */ |
| 1250 | case -ETIMEDOUT: |
| 1251 | task->tk_action = call_timeout; |
Trond Myklebust | 2a49199 | 2009-03-11 14:38:00 -0400 | [diff] [blame] | 1252 | break; |
| 1253 | default: |
| 1254 | rpc_exit(task, -EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | } |
| 1256 | } |
| 1257 | |
| 1258 | /* |
| 1259 | * 5. Transmit the RPC request, and wait for reply |
| 1260 | */ |
| 1261 | static void |
| 1262 | call_transmit(struct rpc_task *task) |
| 1263 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1264 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | |
| 1266 | task->tk_action = call_status; |
| 1267 | if (task->tk_status < 0) |
| 1268 | return; |
| 1269 | task->tk_status = xprt_prepare_transmit(task); |
| 1270 | if (task->tk_status != 0) |
| 1271 | return; |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1272 | task->tk_action = call_transmit_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
Trond Myklebust | 940e331 | 2005-11-09 21:45:24 -0500 | [diff] [blame] | 1274 | if (rpc_task_need_encode(task)) { |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1275 | BUG_ON(task->tk_rqstp->rq_bytes_sent != 0); |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1276 | rpc_xdr_encode(task); |
Trond Myklebust | 5e5ce5b | 2005-10-18 14:20:11 -0700 | [diff] [blame] | 1277 | /* Did the encode result in an error condition? */ |
Trond Myklebust | 8b39f2b | 2008-05-14 19:48:25 -0700 | [diff] [blame] | 1278 | if (task->tk_status != 0) { |
| 1279 | /* Was the error nonfatal? */ |
| 1280 | if (task->tk_status == -EAGAIN) |
| 1281 | rpc_delay(task, HZ >> 4); |
| 1282 | else |
| 1283 | rpc_exit(task, task->tk_status); |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1284 | return; |
Trond Myklebust | 8b39f2b | 2008-05-14 19:48:25 -0700 | [diff] [blame] | 1285 | } |
Trond Myklebust | 5e5ce5b | 2005-10-18 14:20:11 -0700 | [diff] [blame] | 1286 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | xprt_transmit(task); |
| 1288 | if (task->tk_status < 0) |
| 1289 | return; |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1290 | /* |
| 1291 | * On success, ensure that we call xprt_end_transmit() before sleeping |
| 1292 | * in order to allow access to the socket to other RPC requests. |
| 1293 | */ |
| 1294 | call_transmit_status(task); |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 1295 | if (rpc_reply_expected(task)) |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1296 | return; |
| 1297 | task->tk_action = rpc_exit_task; |
Trond Myklebust | fda1393 | 2008-02-22 16:34:12 -0500 | [diff] [blame] | 1298 | rpc_wake_up_queued_task(&task->tk_xprt->pending, task); |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1299 | } |
| 1300 | |
| 1301 | /* |
| 1302 | * 5a. Handle cleanup after a transmission |
| 1303 | */ |
| 1304 | static void |
| 1305 | call_transmit_status(struct rpc_task *task) |
| 1306 | { |
| 1307 | task->tk_action = call_status; |
Chuck Lever | 206a134 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1308 | |
| 1309 | /* |
| 1310 | * Common case: success. Force the compiler to put this |
| 1311 | * test first. |
| 1312 | */ |
| 1313 | if (task->tk_status == 0) { |
| 1314 | xprt_end_transmit(task); |
| 1315 | rpc_task_force_reencode(task); |
| 1316 | return; |
| 1317 | } |
| 1318 | |
Trond Myklebust | 15f081c | 2009-03-11 14:37:57 -0400 | [diff] [blame] | 1319 | switch (task->tk_status) { |
| 1320 | case -EAGAIN: |
| 1321 | break; |
| 1322 | default: |
Chuck Lever | 206a134 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1323 | dprint_status(task); |
Trond Myklebust | 15f081c | 2009-03-11 14:37:57 -0400 | [diff] [blame] | 1324 | xprt_end_transmit(task); |
Chuck Lever | 09a21c4 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1325 | rpc_task_force_reencode(task); |
| 1326 | break; |
Trond Myklebust | 15f081c | 2009-03-11 14:37:57 -0400 | [diff] [blame] | 1327 | /* |
| 1328 | * Special cases: if we've been waiting on the |
| 1329 | * socket's write_space() callback, or if the |
| 1330 | * socket just returned a connection error, |
| 1331 | * then hold onto the transport lock. |
| 1332 | */ |
| 1333 | case -ECONNREFUSED: |
Trond Myklebust | 15f081c | 2009-03-11 14:37:57 -0400 | [diff] [blame] | 1334 | case -EHOSTDOWN: |
| 1335 | case -EHOSTUNREACH: |
| 1336 | case -ENETUNREACH: |
Chuck Lever | 09a21c4 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1337 | if (RPC_IS_SOFTCONN(task)) { |
| 1338 | xprt_end_transmit(task); |
| 1339 | rpc_exit(task, task->tk_status); |
| 1340 | break; |
| 1341 | } |
| 1342 | case -ECONNRESET: |
| 1343 | case -ENOTCONN: |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 1344 | case -EPIPE: |
Trond Myklebust | 15f081c | 2009-03-11 14:37:57 -0400 | [diff] [blame] | 1345 | rpc_task_force_reencode(task); |
| 1346 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | } |
| 1348 | |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 1349 | #if defined(CONFIG_NFS_V4_1) |
| 1350 | /* |
| 1351 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In |
| 1352 | * addition, disconnect on connectivity errors. |
| 1353 | */ |
| 1354 | static void |
| 1355 | call_bc_transmit(struct rpc_task *task) |
| 1356 | { |
| 1357 | struct rpc_rqst *req = task->tk_rqstp; |
| 1358 | |
| 1359 | BUG_ON(task->tk_status != 0); |
| 1360 | task->tk_status = xprt_prepare_transmit(task); |
| 1361 | if (task->tk_status == -EAGAIN) { |
| 1362 | /* |
| 1363 | * Could not reserve the transport. Try again after the |
| 1364 | * transport is released. |
| 1365 | */ |
| 1366 | task->tk_status = 0; |
| 1367 | task->tk_action = call_bc_transmit; |
| 1368 | return; |
| 1369 | } |
| 1370 | |
| 1371 | task->tk_action = rpc_exit_task; |
| 1372 | if (task->tk_status < 0) { |
| 1373 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
| 1374 | "error: %d\n", task->tk_status); |
| 1375 | return; |
| 1376 | } |
| 1377 | |
| 1378 | xprt_transmit(task); |
| 1379 | xprt_end_transmit(task); |
| 1380 | dprint_status(task); |
| 1381 | switch (task->tk_status) { |
| 1382 | case 0: |
| 1383 | /* Success */ |
| 1384 | break; |
| 1385 | case -EHOSTDOWN: |
| 1386 | case -EHOSTUNREACH: |
| 1387 | case -ENETUNREACH: |
| 1388 | case -ETIMEDOUT: |
| 1389 | /* |
| 1390 | * Problem reaching the server. Disconnect and let the |
| 1391 | * forechannel reestablish the connection. The server will |
| 1392 | * have to retransmit the backchannel request and we'll |
| 1393 | * reprocess it. Since these ops are idempotent, there's no |
| 1394 | * need to cache our reply at this time. |
| 1395 | */ |
| 1396 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
| 1397 | "error: %d\n", task->tk_status); |
| 1398 | xprt_conditional_disconnect(task->tk_xprt, |
| 1399 | req->rq_connect_cookie); |
| 1400 | break; |
| 1401 | default: |
| 1402 | /* |
| 1403 | * We were unable to reply and will have to drop the |
| 1404 | * request. The server should reconnect and retransmit. |
| 1405 | */ |
| 1406 | BUG_ON(task->tk_status == -EAGAIN); |
| 1407 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
| 1408 | "error: %d\n", task->tk_status); |
| 1409 | break; |
| 1410 | } |
| 1411 | rpc_wake_up_queued_task(&req->rq_xprt->pending, task); |
| 1412 | } |
| 1413 | #endif /* CONFIG_NFS_V4_1 */ |
| 1414 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | /* |
| 1416 | * 6. Sort out the RPC call status |
| 1417 | */ |
| 1418 | static void |
| 1419 | call_status(struct rpc_task *task) |
| 1420 | { |
| 1421 | struct rpc_clnt *clnt = task->tk_client; |
| 1422 | struct rpc_rqst *req = task->tk_rqstp; |
| 1423 | int status; |
| 1424 | |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 1425 | if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent) |
| 1426 | task->tk_status = req->rq_reply_bytes_recvd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1428 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | |
| 1430 | status = task->tk_status; |
| 1431 | if (status >= 0) { |
| 1432 | task->tk_action = call_decode; |
| 1433 | return; |
| 1434 | } |
| 1435 | |
| 1436 | task->tk_status = 0; |
| 1437 | switch(status) { |
Trond Myklebust | 7630399 | 2006-08-30 14:32:49 -0400 | [diff] [blame] | 1438 | case -EHOSTDOWN: |
| 1439 | case -EHOSTUNREACH: |
| 1440 | case -ENETUNREACH: |
| 1441 | /* |
| 1442 | * Delay any retries for 3 seconds, then handle as if it |
| 1443 | * were a timeout. |
| 1444 | */ |
| 1445 | rpc_delay(task, 3*HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | case -ETIMEDOUT: |
| 1447 | task->tk_action = call_timeout; |
Trond Myklebust | 241c39b | 2007-04-20 16:12:55 -0400 | [diff] [blame] | 1448 | if (task->tk_client->cl_discrtry) |
Trond Myklebust | 7c1d71c | 2008-04-17 16:52:57 -0400 | [diff] [blame] | 1449 | xprt_conditional_disconnect(task->tk_xprt, |
| 1450 | req->rq_connect_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | break; |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 1452 | case -ECONNRESET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | case -ECONNREFUSED: |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 1454 | rpc_force_rebind(clnt); |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 1455 | rpc_delay(task, 3*HZ); |
| 1456 | case -EPIPE: |
| 1457 | case -ENOTCONN: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | task->tk_action = call_bind; |
| 1459 | break; |
| 1460 | case -EAGAIN: |
| 1461 | task->tk_action = call_transmit; |
| 1462 | break; |
| 1463 | case -EIO: |
| 1464 | /* shutdown or soft timeout */ |
| 1465 | rpc_exit(task, status); |
| 1466 | break; |
| 1467 | default: |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 1468 | if (clnt->cl_chatty) |
| 1469 | printk("%s: RPC call returned error %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | clnt->cl_protname, -status); |
| 1471 | rpc_exit(task, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | } |
| 1473 | } |
| 1474 | |
| 1475 | /* |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1476 | * 6a. Handle RPC timeout |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1477 | * We do not release the request slot, so we keep using the |
| 1478 | * same XID for all retransmits. |
| 1479 | */ |
| 1480 | static void |
| 1481 | call_timeout(struct rpc_task *task) |
| 1482 | { |
| 1483 | struct rpc_clnt *clnt = task->tk_client; |
| 1484 | |
| 1485 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1486 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | goto retry; |
| 1488 | } |
| 1489 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1490 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
Chuck Lever | ef759a2 | 2006-03-20 13:44:17 -0500 | [diff] [blame] | 1491 | task->tk_timeouts++; |
| 1492 | |
Chuck Lever | 3a28bec | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1493 | if (RPC_IS_SOFTCONN(task)) { |
| 1494 | rpc_exit(task, -ETIMEDOUT); |
| 1495 | return; |
| 1496 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | if (RPC_IS_SOFT(task)) { |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 1498 | if (clnt->cl_chatty) |
| 1499 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | clnt->cl_protname, clnt->cl_server); |
| 1501 | rpc_exit(task, -EIO); |
| 1502 | return; |
| 1503 | } |
| 1504 | |
Chuck Lever | f518e35a | 2006-01-03 09:55:52 +0100 | [diff] [blame] | 1505 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 1507 | if (clnt->cl_chatty) |
| 1508 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | clnt->cl_protname, clnt->cl_server); |
| 1510 | } |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 1511 | rpc_force_rebind(clnt); |
Trond Myklebust | b48633b | 2008-04-22 16:47:55 -0400 | [diff] [blame] | 1512 | /* |
| 1513 | * Did our request time out due to an RPCSEC_GSS out-of-sequence |
| 1514 | * event? RFC2203 requires the server to drop all such requests. |
| 1515 | */ |
| 1516 | rpcauth_invalcred(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | |
| 1518 | retry: |
| 1519 | clnt->cl_stats->rpcretrans++; |
| 1520 | task->tk_action = call_bind; |
| 1521 | task->tk_status = 0; |
| 1522 | } |
| 1523 | |
| 1524 | /* |
| 1525 | * 7. Decode the RPC reply |
| 1526 | */ |
| 1527 | static void |
| 1528 | call_decode(struct rpc_task *task) |
| 1529 | { |
| 1530 | struct rpc_clnt *clnt = task->tk_client; |
| 1531 | struct rpc_rqst *req = task->tk_rqstp; |
| 1532 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1533 | __be32 *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1534 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1535 | dprintk("RPC: %5u call_decode (status %d)\n", |
| 1536 | task->tk_pid, task->tk_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | |
Chuck Lever | f518e35a | 2006-01-03 09:55:52 +0100 | [diff] [blame] | 1538 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 1539 | if (clnt->cl_chatty) |
| 1540 | printk(KERN_NOTICE "%s: server %s OK\n", |
| 1541 | clnt->cl_protname, clnt->cl_server); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
| 1543 | } |
| 1544 | |
Trond Myklebust | 43ac3f2 | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 1545 | /* |
| 1546 | * Ensure that we see all writes made by xprt_complete_rqst() |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 1547 | * before it changed req->rq_reply_bytes_recvd. |
Trond Myklebust | 43ac3f2 | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 1548 | */ |
| 1549 | smp_rmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
| 1551 | |
| 1552 | /* Check that the softirq receive buffer is valid */ |
| 1553 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, |
| 1554 | sizeof(req->rq_rcv_buf)) != 0); |
| 1555 | |
Trond Myklebust | 1e799b6 | 2008-03-21 16:19:41 -0400 | [diff] [blame] | 1556 | if (req->rq_rcv_buf.len < 12) { |
| 1557 | if (!RPC_IS_SOFT(task)) { |
| 1558 | task->tk_action = call_bind; |
| 1559 | clnt->cl_stats->rpcretrans++; |
| 1560 | goto out_retry; |
| 1561 | } |
| 1562 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", |
| 1563 | clnt->cl_protname, task->tk_status); |
| 1564 | task->tk_action = call_timeout; |
| 1565 | goto out_retry; |
| 1566 | } |
| 1567 | |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1568 | p = rpc_verify_header(task); |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1569 | if (IS_ERR(p)) { |
| 1570 | if (p == ERR_PTR(-EAGAIN)) |
| 1571 | goto out_retry; |
| 1572 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | } |
| 1574 | |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1575 | task->tk_action = rpc_exit_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | |
Trond Myklebust | 6d5fcb5 | 2006-10-18 16:01:06 -0400 | [diff] [blame] | 1577 | if (decode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
| 1579 | task->tk_msg.rpc_resp); |
Trond Myklebust | 6d5fcb5 | 2006-10-18 16:01:06 -0400 | [diff] [blame] | 1580 | } |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1581 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
| 1582 | task->tk_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | return; |
| 1584 | out_retry: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | task->tk_status = 0; |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1586 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
Trond Myklebust | 24b74bf | 2008-04-19 13:15:47 -0400 | [diff] [blame] | 1587 | if (task->tk_rqstp == req) { |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 1588 | req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0; |
Trond Myklebust | 24b74bf | 2008-04-19 13:15:47 -0400 | [diff] [blame] | 1589 | if (task->tk_client->cl_discrtry) |
Trond Myklebust | 7c1d71c | 2008-04-17 16:52:57 -0400 | [diff] [blame] | 1590 | xprt_conditional_disconnect(task->tk_xprt, |
| 1591 | req->rq_connect_cookie); |
Trond Myklebust | 24b74bf | 2008-04-19 13:15:47 -0400 | [diff] [blame] | 1592 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1593 | } |
| 1594 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1595 | static __be32 * |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1596 | rpc_encode_header(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1597 | { |
| 1598 | struct rpc_clnt *clnt = task->tk_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | struct rpc_rqst *req = task->tk_rqstp; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1600 | __be32 *p = req->rq_svec[0].iov_base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | |
| 1602 | /* FIXME: check buffer size? */ |
Chuck Lever | 808012f | 2005-08-25 16:25:49 -0700 | [diff] [blame] | 1603 | |
| 1604 | p = xprt_skip_transport_header(task->tk_xprt, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | *p++ = req->rq_xid; /* XID */ |
| 1606 | *p++ = htonl(RPC_CALL); /* CALL */ |
| 1607 | *p++ = htonl(RPC_VERSION); /* RPC version */ |
| 1608 | *p++ = htonl(clnt->cl_prog); /* program number */ |
| 1609 | *p++ = htonl(clnt->cl_vers); /* program version */ |
| 1610 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ |
Trond Myklebust | 334ccfd | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 1611 | p = rpcauth_marshcred(task, p); |
| 1612 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); |
| 1613 | return p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | } |
| 1615 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1616 | static __be32 * |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1617 | rpc_verify_header(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | { |
| 1619 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; |
| 1620 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1621 | __be32 *p = iov->iov_base; |
| 1622 | u32 n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | int error = -EACCES; |
| 1624 | |
David Howells | e889649 | 2006-08-24 15:44:19 -0400 | [diff] [blame] | 1625 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
| 1626 | /* RFC-1014 says that the representation of XDR data must be a |
| 1627 | * multiple of four bytes |
| 1628 | * - if it isn't pointer subtraction in the NFS client may give |
| 1629 | * undefined results |
| 1630 | */ |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1631 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1632 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1633 | task->tk_rqstp->rq_rcv_buf.len); |
David Howells | e889649 | 2006-08-24 15:44:19 -0400 | [diff] [blame] | 1634 | goto out_eio; |
| 1635 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | if ((len -= 3) < 0) |
| 1637 | goto out_overflow; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | |
Ricardo Labiaga | f4a2e41 | 2009-04-01 09:22:54 -0400 | [diff] [blame] | 1639 | p += 1; /* skip XID */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | if ((n = ntohl(*p++)) != RPC_REPLY) { |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1641 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
Ricardo Labiaga | f4a2e41 | 2009-04-01 09:22:54 -0400 | [diff] [blame] | 1642 | task->tk_pid, __func__, n); |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1643 | goto out_garbage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | } |
Ricardo Labiaga | f4a2e41 | 2009-04-01 09:22:54 -0400 | [diff] [blame] | 1645 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
| 1647 | if (--len < 0) |
| 1648 | goto out_overflow; |
| 1649 | switch ((n = ntohl(*p++))) { |
| 1650 | case RPC_AUTH_ERROR: |
| 1651 | break; |
| 1652 | case RPC_MISMATCH: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1653 | dprintk("RPC: %5u %s: RPC call version " |
| 1654 | "mismatch!\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1655 | task->tk_pid, __func__); |
Andreas Gruenbacher | cdf4770 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 1656 | error = -EPROTONOSUPPORT; |
| 1657 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1658 | default: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1659 | dprintk("RPC: %5u %s: RPC call rejected, " |
| 1660 | "unknown error: %x\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1661 | task->tk_pid, __func__, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | goto out_eio; |
| 1663 | } |
| 1664 | if (--len < 0) |
| 1665 | goto out_overflow; |
| 1666 | switch ((n = ntohl(*p++))) { |
| 1667 | case RPC_AUTH_REJECTEDCRED: |
| 1668 | case RPC_AUTH_REJECTEDVERF: |
| 1669 | case RPCSEC_GSS_CREDPROBLEM: |
| 1670 | case RPCSEC_GSS_CTXPROBLEM: |
| 1671 | if (!task->tk_cred_retry) |
| 1672 | break; |
| 1673 | task->tk_cred_retry--; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1674 | dprintk("RPC: %5u %s: retry stale creds\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1675 | task->tk_pid, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | rpcauth_invalcred(task); |
Trond Myklebust | 220bcc2 | 2007-10-01 12:06:48 -0400 | [diff] [blame] | 1677 | /* Ensure we obtain a new XID! */ |
| 1678 | xprt_release(task); |
Trond Myklebust | 118df3d | 2010-10-24 17:17:31 -0400 | [diff] [blame] | 1679 | task->tk_action = call_reserve; |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1680 | goto out_retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | case RPC_AUTH_BADCRED: |
| 1682 | case RPC_AUTH_BADVERF: |
| 1683 | /* possibly garbled cred/verf? */ |
| 1684 | if (!task->tk_garb_retry) |
| 1685 | break; |
| 1686 | task->tk_garb_retry--; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1687 | dprintk("RPC: %5u %s: retry garbled creds\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1688 | task->tk_pid, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | task->tk_action = call_bind; |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1690 | goto out_retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | case RPC_AUTH_TOOWEAK: |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1692 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
Levent Serinol | 1356b8c | 2006-03-20 13:44:11 -0500 | [diff] [blame] | 1693 | "authentication.\n", task->tk_client->cl_server); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | break; |
| 1695 | default: |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1696 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1697 | task->tk_pid, __func__, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | error = -EIO; |
| 1699 | } |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1700 | dprintk("RPC: %5u %s: call rejected %d\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1701 | task->tk_pid, __func__, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1702 | goto out_err; |
| 1703 | } |
| 1704 | if (!(p = rpcauth_checkverf(task, p))) { |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1705 | dprintk("RPC: %5u %s: auth check failed\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1706 | task->tk_pid, __func__); |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1707 | goto out_garbage; /* bad verifier, retry */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | } |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1709 | len = p - (__be32 *)iov->iov_base - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | if (len < 0) |
| 1711 | goto out_overflow; |
| 1712 | switch ((n = ntohl(*p++))) { |
| 1713 | case RPC_SUCCESS: |
| 1714 | return p; |
| 1715 | case RPC_PROG_UNAVAIL: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1716 | dprintk("RPC: %5u %s: program %u is unsupported by server %s\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1717 | task->tk_pid, __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | (unsigned int)task->tk_client->cl_prog, |
| 1719 | task->tk_client->cl_server); |
Andreas Gruenbacher | cdf4770 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 1720 | error = -EPFNOSUPPORT; |
| 1721 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | case RPC_PROG_MISMATCH: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1723 | dprintk("RPC: %5u %s: program %u, version %u unsupported by " |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1724 | "server %s\n", task->tk_pid, __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | (unsigned int)task->tk_client->cl_prog, |
| 1726 | (unsigned int)task->tk_client->cl_vers, |
| 1727 | task->tk_client->cl_server); |
Andreas Gruenbacher | cdf4770 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 1728 | error = -EPROTONOSUPPORT; |
| 1729 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | case RPC_PROC_UNAVAIL: |
Chuck Lever | 3748f1e | 2008-05-21 17:09:12 -0400 | [diff] [blame] | 1731 | dprintk("RPC: %5u %s: proc %s unsupported by program %u, " |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1732 | "version %u on server %s\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1733 | task->tk_pid, __func__, |
Chuck Lever | 3748f1e | 2008-05-21 17:09:12 -0400 | [diff] [blame] | 1734 | rpc_proc_name(task), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | task->tk_client->cl_prog, |
| 1736 | task->tk_client->cl_vers, |
| 1737 | task->tk_client->cl_server); |
Andreas Gruenbacher | cdf4770 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 1738 | error = -EOPNOTSUPP; |
| 1739 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | case RPC_GARBAGE_ARGS: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1741 | dprintk("RPC: %5u %s: server saw garbage\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1742 | task->tk_pid, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1743 | break; /* retry */ |
| 1744 | default: |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1745 | dprintk("RPC: %5u %s: server accept status: %x\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1746 | task->tk_pid, __func__, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | /* Also retry */ |
| 1748 | } |
| 1749 | |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1750 | out_garbage: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | task->tk_client->cl_stats->rpcgarbage++; |
| 1752 | if (task->tk_garb_retry) { |
| 1753 | task->tk_garb_retry--; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1754 | dprintk("RPC: %5u %s: retrying\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1755 | task->tk_pid, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1756 | task->tk_action = call_bind; |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1757 | out_retry: |
| 1758 | return ERR_PTR(-EAGAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | out_eio: |
| 1761 | error = -EIO; |
| 1762 | out_err: |
| 1763 | rpc_exit(task, error); |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1764 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1765 | __func__, error); |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1766 | return ERR_PTR(error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | out_overflow: |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1768 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1769 | __func__); |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1770 | goto out_garbage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | } |
Trond Myklebust | 5ee0ed7 | 2005-06-22 17:16:20 +0000 | [diff] [blame] | 1772 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1773 | static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj) |
Trond Myklebust | 5ee0ed7 | 2005-06-22 17:16:20 +0000 | [diff] [blame] | 1774 | { |
| 1775 | return 0; |
| 1776 | } |
| 1777 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1778 | static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj) |
Trond Myklebust | 5ee0ed7 | 2005-06-22 17:16:20 +0000 | [diff] [blame] | 1779 | { |
| 1780 | return 0; |
| 1781 | } |
| 1782 | |
| 1783 | static struct rpc_procinfo rpcproc_null = { |
| 1784 | .p_encode = rpcproc_encode_null, |
| 1785 | .p_decode = rpcproc_decode_null, |
| 1786 | }; |
| 1787 | |
Chuck Lever | caabea8 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1788 | static int rpc_ping(struct rpc_clnt *clnt) |
Trond Myklebust | 5ee0ed7 | 2005-06-22 17:16:20 +0000 | [diff] [blame] | 1789 | { |
| 1790 | struct rpc_message msg = { |
| 1791 | .rpc_proc = &rpcproc_null, |
| 1792 | }; |
| 1793 | int err; |
| 1794 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); |
Chuck Lever | caabea8 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1795 | err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN); |
Trond Myklebust | 5ee0ed7 | 2005-06-22 17:16:20 +0000 | [diff] [blame] | 1796 | put_rpccred(msg.rpc_cred); |
| 1797 | return err; |
| 1798 | } |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1799 | |
Trond Myklebust | 5e1550d | 2007-06-23 10:17:16 -0400 | [diff] [blame] | 1800 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
| 1801 | { |
| 1802 | struct rpc_message msg = { |
| 1803 | .rpc_proc = &rpcproc_null, |
| 1804 | .rpc_cred = cred, |
| 1805 | }; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1806 | struct rpc_task_setup task_setup_data = { |
| 1807 | .rpc_client = clnt, |
| 1808 | .rpc_message = &msg, |
| 1809 | .callback_ops = &rpc_default_ops, |
| 1810 | .flags = flags, |
| 1811 | }; |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1812 | return rpc_run_task(&task_setup_data); |
Trond Myklebust | 5e1550d | 2007-06-23 10:17:16 -0400 | [diff] [blame] | 1813 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1814 | EXPORT_SYMBOL_GPL(rpc_call_null); |
Trond Myklebust | 5e1550d | 2007-06-23 10:17:16 -0400 | [diff] [blame] | 1815 | |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1816 | #ifdef RPC_DEBUG |
Chuck Lever | 68a23ee | 2008-05-21 17:09:26 -0400 | [diff] [blame] | 1817 | static void rpc_show_header(void) |
| 1818 | { |
Chuck Lever | cb3997b | 2008-05-21 17:09:41 -0400 | [diff] [blame] | 1819 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
| 1820 | "-timeout ---ops--\n"); |
Chuck Lever | 68a23ee | 2008-05-21 17:09:26 -0400 | [diff] [blame] | 1821 | } |
| 1822 | |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1823 | static void rpc_show_task(const struct rpc_clnt *clnt, |
| 1824 | const struct rpc_task *task) |
| 1825 | { |
| 1826 | const char *rpc_waitq = "none"; |
Chuck Lever | cb3997b | 2008-05-21 17:09:41 -0400 | [diff] [blame] | 1827 | char *p, action[KSYM_SYMBOL_LEN]; |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1828 | |
| 1829 | if (RPC_IS_QUEUED(task)) |
| 1830 | rpc_waitq = rpc_qname(task->tk_waitqueue); |
| 1831 | |
Chuck Lever | cb3997b | 2008-05-21 17:09:41 -0400 | [diff] [blame] | 1832 | /* map tk_action pointer to a function name; then trim off |
| 1833 | * the "+0x0 [sunrpc]" */ |
| 1834 | sprint_symbol(action, (unsigned long)task->tk_action); |
| 1835 | p = strchr(action, '+'); |
| 1836 | if (p) |
| 1837 | *p = '\0'; |
| 1838 | |
| 1839 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%s q:%s\n", |
| 1840 | task->tk_pid, task->tk_flags, task->tk_status, |
| 1841 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, |
| 1842 | clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task), |
| 1843 | action, rpc_waitq); |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1844 | } |
| 1845 | |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1846 | void rpc_show_tasks(void) |
| 1847 | { |
| 1848 | struct rpc_clnt *clnt; |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1849 | struct rpc_task *task; |
Chuck Lever | 68a23ee | 2008-05-21 17:09:26 -0400 | [diff] [blame] | 1850 | int header = 0; |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1851 | |
| 1852 | spin_lock(&rpc_client_lock); |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1853 | list_for_each_entry(clnt, &all_clients, cl_clients) { |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1854 | spin_lock(&clnt->cl_lock); |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1855 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
Chuck Lever | 68a23ee | 2008-05-21 17:09:26 -0400 | [diff] [blame] | 1856 | if (!header) { |
| 1857 | rpc_show_header(); |
| 1858 | header++; |
| 1859 | } |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1860 | rpc_show_task(clnt, task); |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1861 | } |
| 1862 | spin_unlock(&clnt->cl_lock); |
| 1863 | } |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1864 | spin_unlock(&rpc_client_lock); |
| 1865 | } |
| 1866 | #endif |