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> |
| 30 | #include <linux/slab.h> |
Trond Myklebust | 6d5fcb5 | 2006-10-18 16:01:06 -0400 | [diff] [blame] | 31 | #include <linux/smp_lock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/utsname.h> |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 33 | #include <linux/workqueue.h> |
Chuck Lever | 510deb0 | 2007-12-10 14:56:24 -0500 | [diff] [blame] | 34 | #include <linux/in6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | #include <linux/sunrpc/clnt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <linux/sunrpc/rpc_pipe_fs.h> |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 38 | #include <linux/sunrpc/metrics.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #ifdef RPC_DEBUG |
| 42 | # define RPCDBG_FACILITY RPCDBG_CALL |
| 43 | #endif |
| 44 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 45 | #define dprint_status(t) \ |
| 46 | dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 47 | __func__, t->tk_status) |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 48 | |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 49 | /* |
| 50 | * All RPC clients are linked into this list |
| 51 | */ |
| 52 | static LIST_HEAD(all_clients); |
| 53 | static DEFINE_SPINLOCK(rpc_client_lock); |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
| 56 | |
| 57 | |
| 58 | static void call_start(struct rpc_task *task); |
| 59 | static void call_reserve(struct rpc_task *task); |
| 60 | static void call_reserveresult(struct rpc_task *task); |
| 61 | static void call_allocate(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | static void call_decode(struct rpc_task *task); |
| 63 | static void call_bind(struct rpc_task *task); |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 64 | static void call_bind_status(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | static void call_transmit(struct rpc_task *task); |
| 66 | static void call_status(struct rpc_task *task); |
Trond Myklebust | 940e331 | 2005-11-09 21:45:24 -0500 | [diff] [blame] | 67 | static void call_transmit_status(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | static void call_refresh(struct rpc_task *task); |
| 69 | static void call_refreshresult(struct rpc_task *task); |
| 70 | static void call_timeout(struct rpc_task *task); |
| 71 | static void call_connect(struct rpc_task *task); |
| 72 | static void call_connect_status(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 74 | static __be32 *rpc_encode_header(struct rpc_task *task); |
| 75 | static __be32 *rpc_verify_header(struct rpc_task *task); |
Trond Myklebust | 64c91a1 | 2007-06-23 10:17:16 -0400 | [diff] [blame] | 76 | static int rpc_ping(struct rpc_clnt *clnt, int flags); |
| 77 | |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 78 | static void rpc_register_client(struct rpc_clnt *clnt) |
| 79 | { |
| 80 | spin_lock(&rpc_client_lock); |
| 81 | list_add(&clnt->cl_clients, &all_clients); |
| 82 | spin_unlock(&rpc_client_lock); |
| 83 | } |
| 84 | |
| 85 | static void rpc_unregister_client(struct rpc_clnt *clnt) |
| 86 | { |
| 87 | spin_lock(&rpc_client_lock); |
| 88 | list_del(&clnt->cl_clients); |
| 89 | spin_unlock(&rpc_client_lock); |
| 90 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
| 92 | static int |
| 93 | rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) |
| 94 | { |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 95 | static uint32_t clntid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | int error; |
| 97 | |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 98 | clnt->cl_vfsmnt = ERR_PTR(-ENOENT); |
| 99 | clnt->cl_dentry = ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | if (dir_name == NULL) |
| 101 | return 0; |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 102 | |
| 103 | clnt->cl_vfsmnt = rpc_get_mount(); |
| 104 | if (IS_ERR(clnt->cl_vfsmnt)) |
| 105 | return PTR_ERR(clnt->cl_vfsmnt); |
| 106 | |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 107 | for (;;) { |
| 108 | snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname), |
| 109 | "%s/clnt%x", dir_name, |
| 110 | (unsigned int)clntid++); |
| 111 | clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; |
| 112 | clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt); |
| 113 | if (!IS_ERR(clnt->cl_dentry)) |
| 114 | return 0; |
Christoph Hellwig | 278c995 | 2005-07-24 23:53:01 +0100 | [diff] [blame] | 115 | error = PTR_ERR(clnt->cl_dentry); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 116 | if (error != -EEXIST) { |
| 117 | printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n", |
| 118 | clnt->cl_pathname, error); |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 119 | rpc_put_mount(); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 120 | return error; |
| 121 | } |
Christoph Hellwig | 278c995 | 2005-07-24 23:53:01 +0100 | [diff] [blame] | 122 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | } |
| 124 | |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 125 | 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] | 126 | { |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 127 | struct rpc_program *program = args->program; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | struct rpc_version *version; |
| 129 | struct rpc_clnt *clnt = NULL; |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 130 | struct rpc_auth *auth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | int err; |
Chuck Lever | 06b8d25 | 2007-09-11 18:00:20 -0400 | [diff] [blame] | 132 | size_t len; |
| 133 | |
| 134 | /* sanity check the name before trying to print it */ |
| 135 | err = -EINVAL; |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 136 | len = strlen(args->servername); |
Chuck Lever | 06b8d25 | 2007-09-11 18:00:20 -0400 | [diff] [blame] | 137 | if (len > RPC_MAXNETNAMELEN) |
| 138 | goto out_no_rpciod; |
| 139 | len++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 141 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 142 | program->name, args->servername, xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
Trond Myklebust | 4ada539 | 2007-06-14 17:26:17 -0400 | [diff] [blame] | 144 | err = rpciod_up(); |
| 145 | if (err) |
| 146 | goto out_no_rpciod; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | err = -EINVAL; |
| 148 | if (!xprt) |
Adrian Bunk | 712917d | 2006-03-13 21:20:47 -0800 | [diff] [blame] | 149 | goto out_no_xprt; |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 150 | |
| 151 | if (args->version >= program->nrvers) |
| 152 | goto out_err; |
| 153 | version = program->version[args->version]; |
| 154 | if (version == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | goto out_err; |
| 156 | |
| 157 | err = -ENOMEM; |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 158 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | if (!clnt) |
| 160 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | clnt->cl_parent = clnt; |
| 162 | |
| 163 | clnt->cl_server = clnt->cl_inline_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | if (len > sizeof(clnt->cl_inline_name)) { |
| 165 | char *buf = kmalloc(len, GFP_KERNEL); |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 166 | if (buf != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | clnt->cl_server = buf; |
| 168 | else |
| 169 | len = sizeof(clnt->cl_inline_name); |
| 170 | } |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 171 | strlcpy(clnt->cl_server, args->servername, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
| 173 | clnt->cl_xprt = xprt; |
| 174 | clnt->cl_procinfo = version->procs; |
| 175 | clnt->cl_maxproc = version->nrprocs; |
| 176 | clnt->cl_protname = program->name; |
Benny Halevy | d5b337b | 2008-09-28 09:21:26 +0300 | [diff] [blame] | 177 | clnt->cl_prog = args->prognumber ? : program->number; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | clnt->cl_vers = version->number; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | clnt->cl_stats = program->stats; |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 180 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
Trond Myklebust | 23bf85b | 2006-11-21 10:40:23 -0500 | [diff] [blame] | 181 | err = -ENOMEM; |
| 182 | if (clnt->cl_metrics == NULL) |
| 183 | goto out_no_stats; |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 184 | clnt->cl_program = program; |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 185 | INIT_LIST_HEAD(&clnt->cl_tasks); |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 186 | spin_lock_init(&clnt->cl_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 188 | if (!xprt_bound(clnt->cl_xprt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | clnt->cl_autobind = 1; |
| 190 | |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 191 | clnt->cl_timeout = xprt->timeout; |
| 192 | if (args->timeout != NULL) { |
| 193 | memcpy(&clnt->cl_timeout_default, args->timeout, |
| 194 | sizeof(clnt->cl_timeout_default)); |
| 195 | clnt->cl_timeout = &clnt->cl_timeout_default; |
| 196 | } |
| 197 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | clnt->cl_rtt = &clnt->cl_rtt_default; |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 199 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 201 | kref_init(&clnt->cl_kref); |
| 202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); |
| 204 | if (err < 0) |
| 205 | goto out_no_path; |
| 206 | |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 207 | auth = rpcauth_create(args->authflavor, clnt); |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 208 | if (IS_ERR(auth)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 210 | args->authflavor); |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 211 | err = PTR_ERR(auth); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | goto out_no_auth; |
| 213 | } |
| 214 | |
| 215 | /* save the nodename */ |
Serge E. Hallyn | e9ff399 | 2006-10-02 02:18:11 -0700 | [diff] [blame] | 216 | clnt->cl_nodelen = strlen(utsname()->nodename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | if (clnt->cl_nodelen > UNX_MAXNODENAME) |
| 218 | clnt->cl_nodelen = UNX_MAXNODENAME; |
Serge E. Hallyn | e9ff399 | 2006-10-02 02:18:11 -0700 | [diff] [blame] | 219 | memcpy(clnt->cl_nodename, utsname()->nodename, clnt->cl_nodelen); |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 220 | rpc_register_client(clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | return clnt; |
| 222 | |
| 223 | out_no_auth: |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 224 | if (!IS_ERR(clnt->cl_dentry)) { |
Trond Myklebust | dff02cc | 2006-07-31 14:17:18 -0700 | [diff] [blame] | 225 | rpc_rmdir(clnt->cl_dentry); |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 226 | rpc_put_mount(); |
| 227 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | out_no_path: |
Trond Myklebust | 23bf85b | 2006-11-21 10:40:23 -0500 | [diff] [blame] | 229 | rpc_free_iostats(clnt->cl_metrics); |
| 230 | out_no_stats: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | if (clnt->cl_server != clnt->cl_inline_name) |
| 232 | kfree(clnt->cl_server); |
| 233 | kfree(clnt); |
| 234 | out_err: |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 235 | xprt_put(xprt); |
Adrian Bunk | 712917d | 2006-03-13 21:20:47 -0800 | [diff] [blame] | 236 | out_no_xprt: |
Trond Myklebust | 4ada539 | 2007-06-14 17:26:17 -0400 | [diff] [blame] | 237 | rpciod_down(); |
| 238 | out_no_rpciod: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | return ERR_PTR(err); |
| 240 | } |
| 241 | |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 242 | /* |
| 243 | * rpc_create - create an RPC client and transport with one call |
| 244 | * @args: rpc_clnt create argument structure |
| 245 | * |
| 246 | * Creates and initializes an RPC transport and an RPC client. |
| 247 | * |
| 248 | * It can ping the server in order to determine if it is up, and to see if |
| 249 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables |
| 250 | * this behavior so asynchronous tasks can also use rpc_create. |
| 251 | */ |
| 252 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) |
| 253 | { |
| 254 | struct rpc_xprt *xprt; |
| 255 | struct rpc_clnt *clnt; |
\"Talpey, Thomas\ | 3c341b0b | 2007-09-10 13:47:07 -0400 | [diff] [blame] | 256 | struct xprt_create xprtargs = { |
\"Talpey, Thomas\ | 4fa016e | 2007-09-10 13:47:57 -0400 | [diff] [blame] | 257 | .ident = args->protocol, |
Frank van Maarseveen | d3bc9a1 | 2007-07-09 22:23:35 +0200 | [diff] [blame] | 258 | .srcaddr = args->saddress, |
Frank van Maarseveen | 96802a0 | 2007-07-08 13:08:54 +0200 | [diff] [blame] | 259 | .dstaddr = args->address, |
| 260 | .addrlen = args->addrsize, |
Frank van Maarseveen | 96802a0 | 2007-07-08 13:08:54 +0200 | [diff] [blame] | 261 | }; |
Chuck Lever | 510deb0 | 2007-12-10 14:56:24 -0500 | [diff] [blame] | 262 | char servername[48]; |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 263 | |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 264 | /* |
Chuck Lever | 43780b8 | 2007-07-01 12:13:22 -0400 | [diff] [blame] | 265 | * If the caller chooses not to specify a hostname, whip |
| 266 | * up a string representation of the passed-in address. |
| 267 | */ |
| 268 | if (args->servername == NULL) { |
Chuck Lever | 510deb0 | 2007-12-10 14:56:24 -0500 | [diff] [blame] | 269 | servername[0] = '\0'; |
| 270 | switch (args->address->sa_family) { |
| 271 | case AF_INET: { |
| 272 | struct sockaddr_in *sin = |
| 273 | (struct sockaddr_in *)args->address; |
| 274 | snprintf(servername, sizeof(servername), NIPQUAD_FMT, |
| 275 | NIPQUAD(sin->sin_addr.s_addr)); |
| 276 | break; |
| 277 | } |
| 278 | case AF_INET6: { |
| 279 | struct sockaddr_in6 *sin = |
| 280 | (struct sockaddr_in6 *)args->address; |
| 281 | snprintf(servername, sizeof(servername), NIP6_FMT, |
| 282 | NIP6(sin->sin6_addr)); |
| 283 | break; |
| 284 | } |
| 285 | default: |
| 286 | /* caller wants default server name, but |
| 287 | * address family isn't recognized. */ |
| 288 | return ERR_PTR(-EINVAL); |
| 289 | } |
Chuck Lever | 43780b8 | 2007-07-01 12:13:22 -0400 | [diff] [blame] | 290 | args->servername = servername; |
| 291 | } |
| 292 | |
Chuck Lever | 510deb0 | 2007-12-10 14:56:24 -0500 | [diff] [blame] | 293 | xprt = xprt_create_transport(&xprtargs); |
| 294 | if (IS_ERR(xprt)) |
| 295 | return (struct rpc_clnt *)xprt; |
| 296 | |
Chuck Lever | 43780b8 | 2007-07-01 12:13:22 -0400 | [diff] [blame] | 297 | /* |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 298 | * By default, kernel RPC client connects from a reserved port. |
| 299 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, |
| 300 | * but it is always enabled for rpciod, which handles the connect |
| 301 | * operation. |
| 302 | */ |
| 303 | xprt->resvport = 1; |
| 304 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) |
| 305 | xprt->resvport = 0; |
| 306 | |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 307 | clnt = rpc_new_client(args, xprt); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 308 | if (IS_ERR(clnt)) |
| 309 | return clnt; |
| 310 | |
| 311 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 312 | int err = rpc_ping(clnt, RPC_TASK_SOFT); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 313 | if (err != 0) { |
| 314 | rpc_shutdown_client(clnt); |
| 315 | return ERR_PTR(err); |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | clnt->cl_softrtry = 1; |
| 320 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) |
| 321 | clnt->cl_softrtry = 0; |
| 322 | |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 323 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) |
| 324 | clnt->cl_autobind = 1; |
Chuck Lever | 43d78ef | 2007-02-06 18:26:11 -0500 | [diff] [blame] | 325 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
| 326 | clnt->cl_discrtry = 1; |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 327 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) |
| 328 | clnt->cl_chatty = 1; |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 329 | |
| 330 | return clnt; |
| 331 | } |
Chuck Lever | b86acd5 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 332 | EXPORT_SYMBOL_GPL(rpc_create); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 333 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | /* |
| 335 | * This function clones the RPC client structure. It allows us to share the |
| 336 | * same transport while varying parameters such as the authentication |
| 337 | * flavour. |
| 338 | */ |
| 339 | struct rpc_clnt * |
| 340 | rpc_clone_client(struct rpc_clnt *clnt) |
| 341 | { |
| 342 | struct rpc_clnt *new; |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 343 | int err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
Arnaldo Carvalho de Melo | e69062b | 2006-11-21 01:21:34 -0200 | [diff] [blame] | 345 | new = kmemdup(clnt, sizeof(*new), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | if (!new) |
| 347 | goto out_no_clnt; |
Trond Myklebust | d431a555 | 2007-06-17 17:07:54 -0400 | [diff] [blame] | 348 | new->cl_parent = clnt; |
| 349 | /* Turn off autobind on clones */ |
| 350 | new->cl_autobind = 0; |
| 351 | INIT_LIST_HEAD(&new->cl_tasks); |
| 352 | spin_lock_init(&new->cl_lock); |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 353 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval); |
Trond Myklebust | 23bf85b | 2006-11-21 10:40:23 -0500 | [diff] [blame] | 354 | new->cl_metrics = rpc_alloc_iostats(clnt); |
| 355 | if (new->cl_metrics == NULL) |
| 356 | goto out_no_stats; |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 357 | kref_init(&new->cl_kref); |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 358 | err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name); |
| 359 | if (err != 0) |
| 360 | goto out_no_path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | if (new->cl_auth) |
| 362 | atomic_inc(&new->cl_auth->au_count); |
Trond Myklebust | d431a555 | 2007-06-17 17:07:54 -0400 | [diff] [blame] | 363 | xprt_get(clnt->cl_xprt); |
| 364 | kref_get(&clnt->cl_kref); |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 365 | rpc_register_client(new); |
Trond Myklebust | 4ada539 | 2007-06-14 17:26:17 -0400 | [diff] [blame] | 366 | rpciod_up(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | return new; |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 368 | out_no_path: |
| 369 | rpc_free_iostats(new->cl_metrics); |
Trond Myklebust | 23bf85b | 2006-11-21 10:40:23 -0500 | [diff] [blame] | 370 | out_no_stats: |
| 371 | kfree(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | out_no_clnt: |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 373 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 374 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 376 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | |
| 378 | /* |
| 379 | * Properly shut down an RPC client, terminating all outstanding |
Trond Myklebust | 90c5755 | 2007-06-09 19:49:36 -0400 | [diff] [blame] | 380 | * requests. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | */ |
Trond Myklebust | 4c402b4 | 2007-06-14 16:40:32 -0400 | [diff] [blame] | 382 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | { |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 384 | dprintk("RPC: shutting down %s client for %s\n", |
| 385 | clnt->cl_protname, clnt->cl_server); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 387 | while (!list_empty(&clnt->cl_tasks)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | rpc_killall_tasks(clnt); |
Ingo Molnar | 532347e | 2006-01-09 20:52:53 -0800 | [diff] [blame] | 389 | wait_event_timeout(destroy_wait, |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 390 | list_empty(&clnt->cl_tasks), 1*HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | } |
| 392 | |
Trond Myklebust | 4c402b4 | 2007-06-14 16:40:32 -0400 | [diff] [blame] | 393 | rpc_release_client(clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 395 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | |
| 397 | /* |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 398 | * Free an RPC client |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | */ |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 400 | static void |
| 401 | rpc_free_client(struct kref *kref) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | { |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 403 | struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 405 | dprintk("RPC: destroying %s client for %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | clnt->cl_protname, clnt->cl_server); |
Trond Myklebust | 8f8e7a5 | 2006-08-14 13:11:15 -0400 | [diff] [blame] | 407 | if (!IS_ERR(clnt->cl_dentry)) { |
Trond Myklebust | dff02cc | 2006-07-31 14:17:18 -0700 | [diff] [blame] | 408 | rpc_rmdir(clnt->cl_dentry); |
Trond Myklebust | 8f8e7a5 | 2006-08-14 13:11:15 -0400 | [diff] [blame] | 409 | rpc_put_mount(); |
| 410 | } |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 411 | if (clnt->cl_parent != clnt) { |
Trond Myklebust | 8ad7c89 | 2007-06-14 16:40:32 -0400 | [diff] [blame] | 412 | rpc_release_client(clnt->cl_parent); |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 413 | goto out_free; |
| 414 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | if (clnt->cl_server != clnt->cl_inline_name) |
| 416 | kfree(clnt->cl_server); |
| 417 | out_free: |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 418 | rpc_unregister_client(clnt); |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 419 | rpc_free_iostats(clnt->cl_metrics); |
| 420 | clnt->cl_metrics = NULL; |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 421 | xprt_put(clnt->cl_xprt); |
Trond Myklebust | 4ada539 | 2007-06-14 17:26:17 -0400 | [diff] [blame] | 422 | rpciod_down(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | kfree(clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | } |
| 425 | |
| 426 | /* |
Trond Myklebust | 1dd17ec | 2007-06-26 16:57:41 -0400 | [diff] [blame] | 427 | * Free an RPC client |
| 428 | */ |
| 429 | static void |
| 430 | rpc_free_auth(struct kref *kref) |
| 431 | { |
| 432 | struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); |
| 433 | |
| 434 | if (clnt->cl_auth == NULL) { |
| 435 | rpc_free_client(kref); |
| 436 | return; |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to |
| 441 | * release remaining GSS contexts. This mechanism ensures |
| 442 | * that it can do so safely. |
| 443 | */ |
| 444 | kref_init(kref); |
| 445 | rpcauth_release(clnt->cl_auth); |
| 446 | clnt->cl_auth = NULL; |
| 447 | kref_put(kref, rpc_free_client); |
| 448 | } |
| 449 | |
| 450 | /* |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 451 | * Release reference to the RPC client |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | */ |
| 453 | void |
| 454 | rpc_release_client(struct rpc_clnt *clnt) |
| 455 | { |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 456 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 458 | if (list_empty(&clnt->cl_tasks)) |
| 459 | wake_up(&destroy_wait); |
Trond Myklebust | 1dd17ec | 2007-06-26 16:57:41 -0400 | [diff] [blame] | 460 | kref_put(&clnt->cl_kref, rpc_free_auth); |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 461 | } |
| 462 | |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 463 | /** |
| 464 | * 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] | 465 | * @old: old rpc_client |
| 466 | * @program: rpc program to set |
| 467 | * @vers: rpc program version |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 468 | * |
| 469 | * Clones the rpc client and sets up a new RPC program. This is mainly |
| 470 | * of use for enabling different RPC programs to share the same transport. |
| 471 | * The Sun NFSv2/v3 ACL protocol can do this. |
| 472 | */ |
| 473 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, |
| 474 | struct rpc_program *program, |
Chuck Lever | 89eb21c | 2007-09-11 18:00:09 -0400 | [diff] [blame] | 475 | u32 vers) |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 476 | { |
| 477 | struct rpc_clnt *clnt; |
| 478 | struct rpc_version *version; |
| 479 | int err; |
| 480 | |
| 481 | BUG_ON(vers >= program->nrvers || !program->version[vers]); |
| 482 | version = program->version[vers]; |
| 483 | clnt = rpc_clone_client(old); |
| 484 | if (IS_ERR(clnt)) |
| 485 | goto out; |
| 486 | clnt->cl_procinfo = version->procs; |
| 487 | clnt->cl_maxproc = version->nrprocs; |
| 488 | clnt->cl_protname = program->name; |
| 489 | clnt->cl_prog = program->number; |
| 490 | clnt->cl_vers = version->number; |
| 491 | clnt->cl_stats = program->stats; |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 492 | err = rpc_ping(clnt, RPC_TASK_SOFT); |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 493 | if (err != 0) { |
| 494 | rpc_shutdown_client(clnt); |
| 495 | clnt = ERR_PTR(err); |
| 496 | } |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 497 | out: |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 498 | return clnt; |
| 499 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 500 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 501 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | /* |
| 503 | * Default callback for async RPC calls |
| 504 | */ |
| 505 | static void |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 506 | rpc_default_callback(struct rpc_task *task, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | { |
| 508 | } |
| 509 | |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 510 | static const struct rpc_call_ops rpc_default_ops = { |
| 511 | .rpc_call_done = rpc_default_callback, |
| 512 | }; |
| 513 | |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 514 | /** |
| 515 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it |
| 516 | * @task_setup_data: pointer to task initialisation data |
| 517 | */ |
| 518 | 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] | 519 | { |
| 520 | struct rpc_task *task, *ret; |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 521 | |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 522 | task = rpc_new_task(task_setup_data); |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 523 | if (task == NULL) { |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 524 | rpc_release_calldata(task_setup_data->callback_ops, |
| 525 | task_setup_data->callback_data); |
Trond Myklebust | 5085925 | 2007-10-25 18:19:37 -0400 | [diff] [blame] | 526 | ret = ERR_PTR(-ENOMEM); |
| 527 | goto out; |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 528 | } |
| 529 | |
Trond Myklebust | b3ef8b3 | 2007-10-25 18:32:34 -0400 | [diff] [blame] | 530 | if (task->tk_status != 0) { |
| 531 | ret = ERR_PTR(task->tk_status); |
| 532 | rpc_put_task(task); |
| 533 | goto out; |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 534 | } |
| 535 | atomic_inc(&task->tk_count); |
| 536 | rpc_execute(task); |
| 537 | ret = task; |
| 538 | out: |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 539 | return ret; |
| 540 | } |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 541 | EXPORT_SYMBOL_GPL(rpc_run_task); |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 542 | |
| 543 | /** |
| 544 | * rpc_call_sync - Perform a synchronous RPC call |
| 545 | * @clnt: pointer to RPC client |
| 546 | * @msg: RPC call parameters |
| 547 | * @flags: RPC call flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | */ |
Trond Myklebust | cbc2005 | 2008-02-14 11:11:30 -0500 | [diff] [blame] | 549 | 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] | 550 | { |
| 551 | struct rpc_task *task; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 552 | struct rpc_task_setup task_setup_data = { |
| 553 | .rpc_client = clnt, |
| 554 | .rpc_message = msg, |
| 555 | .callback_ops = &rpc_default_ops, |
| 556 | .flags = flags, |
| 557 | }; |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 558 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | BUG_ON(flags & RPC_TASK_ASYNC); |
| 561 | |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 562 | task = rpc_run_task(&task_setup_data); |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 563 | if (IS_ERR(task)) |
| 564 | return PTR_ERR(task); |
Trond Myklebust | e60859a | 2006-01-03 09:55:10 +0100 | [diff] [blame] | 565 | status = task->tk_status; |
Trond Myklebust | bde8f00 | 2007-01-24 11:54:53 -0800 | [diff] [blame] | 566 | rpc_put_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | return status; |
| 568 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 569 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 571 | /** |
| 572 | * rpc_call_async - Perform an asynchronous RPC call |
| 573 | * @clnt: pointer to RPC client |
| 574 | * @msg: RPC call parameters |
| 575 | * @flags: RPC call flags |
Randy Dunlap | 65b6e42 | 2008-02-13 15:03:23 -0800 | [diff] [blame] | 576 | * @tk_ops: RPC call ops |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 577 | * @data: user call data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | */ |
| 579 | int |
Trond Myklebust | cbc2005 | 2008-02-14 11:11:30 -0500 | [diff] [blame] | 580 | 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] | 581 | const struct rpc_call_ops *tk_ops, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | { |
| 583 | struct rpc_task *task; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 584 | struct rpc_task_setup task_setup_data = { |
| 585 | .rpc_client = clnt, |
| 586 | .rpc_message = msg, |
| 587 | .callback_ops = tk_ops, |
| 588 | .callback_data = data, |
| 589 | .flags = flags|RPC_TASK_ASYNC, |
| 590 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 592 | task = rpc_run_task(&task_setup_data); |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 593 | if (IS_ERR(task)) |
| 594 | return PTR_ERR(task); |
| 595 | rpc_put_task(task); |
| 596 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 598 | EXPORT_SYMBOL_GPL(rpc_call_async); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | void |
Trond Myklebust | 77de2c5 | 2007-10-25 18:40:21 -0400 | [diff] [blame] | 601 | rpc_call_start(struct rpc_task *task) |
| 602 | { |
| 603 | task->tk_action = call_start; |
| 604 | } |
| 605 | EXPORT_SYMBOL_GPL(rpc_call_start); |
| 606 | |
Chuck Lever | ed39440 | 2006-08-22 20:06:17 -0400 | [diff] [blame] | 607 | /** |
| 608 | * rpc_peeraddr - extract remote peer address from clnt's xprt |
| 609 | * @clnt: RPC client structure |
| 610 | * @buf: target buffer |
Randy Dunlap | 65b6e42 | 2008-02-13 15:03:23 -0800 | [diff] [blame] | 611 | * @bufsize: length of target buffer |
Chuck Lever | ed39440 | 2006-08-22 20:06:17 -0400 | [diff] [blame] | 612 | * |
| 613 | * Returns the number of bytes that are actually in the stored address. |
| 614 | */ |
| 615 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) |
| 616 | { |
| 617 | size_t bytes; |
| 618 | struct rpc_xprt *xprt = clnt->cl_xprt; |
| 619 | |
| 620 | bytes = sizeof(xprt->addr); |
| 621 | if (bytes > bufsize) |
| 622 | bytes = bufsize; |
| 623 | memcpy(buf, &clnt->cl_xprt->addr, bytes); |
Chuck Lever | c4efcb1 | 2006-08-22 20:06:19 -0400 | [diff] [blame] | 624 | return xprt->addrlen; |
Chuck Lever | ed39440 | 2006-08-22 20:06:17 -0400 | [diff] [blame] | 625 | } |
Chuck Lever | b86acd5 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 626 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
Chuck Lever | ed39440 | 2006-08-22 20:06:17 -0400 | [diff] [blame] | 627 | |
Chuck Lever | f425eba | 2006-08-22 20:06:18 -0400 | [diff] [blame] | 628 | /** |
| 629 | * rpc_peeraddr2str - return remote peer address in printable format |
| 630 | * @clnt: RPC client structure |
| 631 | * @format: address format |
| 632 | * |
| 633 | */ |
Chuck Lever | b454ae9 | 2008-01-07 18:34:48 -0500 | [diff] [blame] | 634 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
| 635 | enum rpc_display_format_t format) |
Chuck Lever | f425eba | 2006-08-22 20:06:18 -0400 | [diff] [blame] | 636 | { |
| 637 | struct rpc_xprt *xprt = clnt->cl_xprt; |
Chuck Lever | 7559c7a | 2006-12-05 16:35:37 -0500 | [diff] [blame] | 638 | |
| 639 | if (xprt->address_strings[format] != NULL) |
| 640 | return xprt->address_strings[format]; |
| 641 | else |
| 642 | return "unprintable"; |
Chuck Lever | f425eba | 2006-08-22 20:06:18 -0400 | [diff] [blame] | 643 | } |
Chuck Lever | b86acd5 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 644 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
Chuck Lever | f425eba | 2006-08-22 20:06:18 -0400 | [diff] [blame] | 645 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | void |
| 647 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) |
| 648 | { |
| 649 | struct rpc_xprt *xprt = clnt->cl_xprt; |
Chuck Lever | 470056c | 2005-08-25 16:25:56 -0700 | [diff] [blame] | 650 | if (xprt->ops->set_buffer_size) |
| 651 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 653 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
| 655 | /* |
| 656 | * Return size of largest payload RPC client can support, in bytes |
| 657 | * |
| 658 | * For stream transports, this is one RPC record fragment (see RFC |
| 659 | * 1831), as we don't support multi-record requests yet. For datagram |
| 660 | * transports, this is the size of an IP packet minus the IP, UDP, and |
| 661 | * RPC header sizes. |
| 662 | */ |
| 663 | size_t rpc_max_payload(struct rpc_clnt *clnt) |
| 664 | { |
| 665 | return clnt->cl_xprt->max_payload; |
| 666 | } |
Chuck Lever | b86acd5 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 667 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 669 | /** |
| 670 | * rpc_force_rebind - force transport to check that remote port is unchanged |
| 671 | * @clnt: client to rebind |
| 672 | * |
| 673 | */ |
| 674 | void rpc_force_rebind(struct rpc_clnt *clnt) |
| 675 | { |
| 676 | if (clnt->cl_autobind) |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 677 | xprt_clear_bound(clnt->cl_xprt); |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 678 | } |
Chuck Lever | b86acd5 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 679 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 680 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | /* |
| 682 | * Restart an (async) RPC call. Usually called from within the |
| 683 | * exit handler. |
| 684 | */ |
| 685 | void |
| 686 | rpc_restart_call(struct rpc_task *task) |
| 687 | { |
| 688 | if (RPC_ASSASSINATED(task)) |
| 689 | return; |
| 690 | |
| 691 | task->tk_action = call_start; |
| 692 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 693 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | |
Chuck Lever | 3748f1e | 2008-05-21 17:09:12 -0400 | [diff] [blame] | 695 | #ifdef RPC_DEBUG |
| 696 | static const char *rpc_proc_name(const struct rpc_task *task) |
| 697 | { |
| 698 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
| 699 | |
| 700 | if (proc) { |
| 701 | if (proc->p_name) |
| 702 | return proc->p_name; |
| 703 | else |
| 704 | return "NULL"; |
| 705 | } else |
| 706 | return "no proc"; |
| 707 | } |
| 708 | #endif |
| 709 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | /* |
| 711 | * 0. Initial state |
| 712 | * |
| 713 | * Other FSM states can be visited zero or more times, but |
| 714 | * this state is visited exactly once for each RPC. |
| 715 | */ |
| 716 | static void |
| 717 | call_start(struct rpc_task *task) |
| 718 | { |
| 719 | struct rpc_clnt *clnt = task->tk_client; |
| 720 | |
Chuck Lever | 3748f1e | 2008-05-21 17:09:12 -0400 | [diff] [blame] | 721 | 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] | 722 | clnt->cl_protname, clnt->cl_vers, |
Chuck Lever | 3748f1e | 2008-05-21 17:09:12 -0400 | [diff] [blame] | 723 | rpc_proc_name(task), |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 724 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | |
| 726 | /* Increment call count */ |
| 727 | task->tk_msg.rpc_proc->p_count++; |
| 728 | clnt->cl_stats->rpccnt++; |
| 729 | task->tk_action = call_reserve; |
| 730 | } |
| 731 | |
| 732 | /* |
| 733 | * 1. Reserve an RPC call slot |
| 734 | */ |
| 735 | static void |
| 736 | call_reserve(struct rpc_task *task) |
| 737 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 738 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | |
| 740 | if (!rpcauth_uptodatecred(task)) { |
| 741 | task->tk_action = call_refresh; |
| 742 | return; |
| 743 | } |
| 744 | |
| 745 | task->tk_status = 0; |
| 746 | task->tk_action = call_reserveresult; |
| 747 | xprt_reserve(task); |
| 748 | } |
| 749 | |
| 750 | /* |
| 751 | * 1b. Grok the result of xprt_reserve() |
| 752 | */ |
| 753 | static void |
| 754 | call_reserveresult(struct rpc_task *task) |
| 755 | { |
| 756 | int status = task->tk_status; |
| 757 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 758 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | |
| 760 | /* |
| 761 | * After a call to xprt_reserve(), we must have either |
| 762 | * a request slot or else an error status. |
| 763 | */ |
| 764 | task->tk_status = 0; |
| 765 | if (status >= 0) { |
| 766 | if (task->tk_rqstp) { |
| 767 | task->tk_action = call_allocate; |
| 768 | return; |
| 769 | } |
| 770 | |
| 771 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 772 | __func__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | rpc_exit(task, -EIO); |
| 774 | return; |
| 775 | } |
| 776 | |
| 777 | /* |
| 778 | * Even though there was an error, we may have acquired |
| 779 | * a request slot somehow. Make sure not to leak it. |
| 780 | */ |
| 781 | if (task->tk_rqstp) { |
| 782 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 783 | __func__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | xprt_release(task); |
| 785 | } |
| 786 | |
| 787 | switch (status) { |
| 788 | case -EAGAIN: /* woken up; retry */ |
| 789 | task->tk_action = call_reserve; |
| 790 | return; |
| 791 | case -EIO: /* probably a shutdown */ |
| 792 | break; |
| 793 | default: |
| 794 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 795 | __func__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | break; |
| 797 | } |
| 798 | rpc_exit(task, status); |
| 799 | } |
| 800 | |
| 801 | /* |
| 802 | * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 803 | * (Note: buffer memory is freed in xprt_release). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | */ |
| 805 | static void |
| 806 | call_allocate(struct rpc_task *task) |
| 807 | { |
Trond Myklebust | 1be27f3 | 2007-06-27 14:29:04 -0400 | [diff] [blame] | 808 | unsigned int slack = task->tk_msg.rpc_cred->cr_auth->au_cslack; |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 809 | struct rpc_rqst *req = task->tk_rqstp; |
| 810 | struct rpc_xprt *xprt = task->tk_xprt; |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 811 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 813 | dprint_status(task); |
| 814 | |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 815 | task->tk_status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | task->tk_action = call_bind; |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 817 | |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 818 | if (req->rq_buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | return; |
| 820 | |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 821 | if (proc->p_proc != 0) { |
| 822 | BUG_ON(proc->p_arglen == 0); |
| 823 | if (proc->p_decode != NULL) |
| 824 | BUG_ON(proc->p_replen == 0); |
| 825 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 827 | /* |
| 828 | * Calculate the size (in quads) of the RPC call |
| 829 | * and reply headers, and convert both values |
| 830 | * to byte sizes. |
| 831 | */ |
| 832 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; |
| 833 | req->rq_callsize <<= 2; |
| 834 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; |
| 835 | req->rq_rcvsize <<= 2; |
| 836 | |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 837 | req->rq_buffer = xprt->ops->buf_alloc(task, |
| 838 | req->rq_callsize + req->rq_rcvsize); |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 839 | if (req->rq_buffer != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | return; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 841 | |
| 842 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | |
Trond Myklebust | 14b218a | 2005-06-22 17:16:28 +0000 | [diff] [blame] | 844 | if (RPC_IS_ASYNC(task) || !signalled()) { |
Trond Myklebust | b6e9c71 | 2007-10-01 12:06:44 -0400 | [diff] [blame] | 845 | task->tk_action = call_allocate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | rpc_delay(task, HZ>>4); |
| 847 | return; |
| 848 | } |
| 849 | |
| 850 | rpc_exit(task, -ERESTARTSYS); |
| 851 | } |
| 852 | |
Trond Myklebust | 940e331 | 2005-11-09 21:45:24 -0500 | [diff] [blame] | 853 | static inline int |
| 854 | rpc_task_need_encode(struct rpc_task *task) |
| 855 | { |
| 856 | return task->tk_rqstp->rq_snd_buf.len == 0; |
| 857 | } |
| 858 | |
| 859 | static inline void |
| 860 | rpc_task_force_reencode(struct rpc_task *task) |
| 861 | { |
| 862 | task->tk_rqstp->rq_snd_buf.len = 0; |
| 863 | } |
| 864 | |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 865 | static inline void |
| 866 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) |
| 867 | { |
| 868 | buf->head[0].iov_base = start; |
| 869 | buf->head[0].iov_len = len; |
| 870 | buf->tail[0].iov_len = 0; |
| 871 | buf->page_len = 0; |
\"Talpey, Thomas\ | 4f22ccc | 2007-09-10 13:44:58 -0400 | [diff] [blame] | 872 | buf->flags = 0; |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 873 | buf->len = 0; |
| 874 | buf->buflen = len; |
| 875 | } |
| 876 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | /* |
| 878 | * 3. Encode arguments of an RPC call |
| 879 | */ |
| 880 | static void |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 881 | rpc_xdr_encode(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | struct rpc_rqst *req = task->tk_rqstp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | kxdrproc_t encode; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 885 | __be32 *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 887 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 889 | rpc_xdr_buf_init(&req->rq_snd_buf, |
| 890 | req->rq_buffer, |
| 891 | req->rq_callsize); |
| 892 | rpc_xdr_buf_init(&req->rq_rcv_buf, |
| 893 | (char *)req->rq_buffer + req->rq_callsize, |
| 894 | req->rq_rcvsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 896 | p = rpc_encode_header(task); |
| 897 | if (p == NULL) { |
| 898 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | rpc_exit(task, -EIO); |
| 900 | return; |
| 901 | } |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 902 | |
| 903 | encode = task->tk_msg.rpc_proc->p_encode; |
J. Bruce Fields | f368031 | 2005-10-13 16:54:48 -0400 | [diff] [blame] | 904 | if (encode == NULL) |
| 905 | return; |
| 906 | |
| 907 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, |
| 908 | task->tk_msg.rpc_argp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | } |
| 910 | |
| 911 | /* |
| 912 | * 4. Get the server port number if not yet set |
| 913 | */ |
| 914 | static void |
| 915 | call_bind(struct rpc_task *task) |
| 916 | { |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 917 | struct rpc_xprt *xprt = task->tk_xprt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 919 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 921 | task->tk_action = call_connect; |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 922 | if (!xprt_bound(xprt)) { |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 923 | task->tk_action = call_bind_status; |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 924 | task->tk_timeout = xprt->bind_timeout; |
Chuck Lever | bbf7c1d | 2006-08-22 20:06:16 -0400 | [diff] [blame] | 925 | xprt->ops->rpcbind(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | } |
| 927 | } |
| 928 | |
| 929 | /* |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 930 | * 4a. Sort out bind result |
| 931 | */ |
| 932 | static void |
| 933 | call_bind_status(struct rpc_task *task) |
| 934 | { |
Chuck Lever | 906462a | 2007-09-11 18:00:47 -0400 | [diff] [blame] | 935 | int status = -EIO; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 936 | |
| 937 | if (task->tk_status >= 0) { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 938 | dprint_status(task); |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 939 | task->tk_status = 0; |
| 940 | task->tk_action = call_connect; |
| 941 | return; |
| 942 | } |
| 943 | |
| 944 | switch (task->tk_status) { |
Trond Myklebust | 381ba74 | 2008-07-07 12:18:53 -0400 | [diff] [blame] | 945 | case -ENOMEM: |
| 946 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); |
| 947 | rpc_delay(task, HZ >> 2); |
Chuck Lever | 2429cbf | 2007-09-11 18:00:41 -0400 | [diff] [blame] | 948 | goto retry_timeout; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 949 | case -EACCES: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 950 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
| 951 | "unavailable\n", task->tk_pid); |
Chuck Lever | b79dc8c | 2007-09-11 18:00:52 -0400 | [diff] [blame] | 952 | /* fail immediately if this is an RPC ping */ |
| 953 | if (task->tk_msg.rpc_proc->p_proc == 0) { |
| 954 | status = -EOPNOTSUPP; |
| 955 | break; |
| 956 | } |
Chuck Lever | ea635a5 | 2005-10-06 23:12:58 -0400 | [diff] [blame] | 957 | rpc_delay(task, 3*HZ); |
Trond Myklebust | da45828e | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 958 | goto retry_timeout; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 959 | case -ETIMEDOUT: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 960 | dprintk("RPC: %5u rpcbind request timed out\n", |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 961 | task->tk_pid); |
Trond Myklebust | da45828e | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 962 | goto retry_timeout; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 963 | case -EPFNOSUPPORT: |
Chuck Lever | 906462a | 2007-09-11 18:00:47 -0400 | [diff] [blame] | 964 | /* server doesn't support any rpcbind version we know of */ |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 965 | dprintk("RPC: %5u remote rpcbind service unavailable\n", |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 966 | task->tk_pid); |
| 967 | break; |
| 968 | case -EPROTONOSUPPORT: |
Chuck Lever | 00a6e7b | 2007-03-29 16:48:33 -0400 | [diff] [blame] | 969 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 970 | task->tk_pid); |
Chuck Lever | 00a6e7b | 2007-03-29 16:48:33 -0400 | [diff] [blame] | 971 | task->tk_status = 0; |
| 972 | task->tk_action = call_bind; |
| 973 | return; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 974 | default: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 975 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 976 | task->tk_pid, -task->tk_status); |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 977 | } |
| 978 | |
| 979 | rpc_exit(task, status); |
| 980 | return; |
| 981 | |
Trond Myklebust | da45828e | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 982 | retry_timeout: |
| 983 | task->tk_action = call_timeout; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 984 | } |
| 985 | |
| 986 | /* |
| 987 | * 4b. Connect to the RPC server |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | */ |
| 989 | static void |
| 990 | call_connect(struct rpc_task *task) |
| 991 | { |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 992 | struct rpc_xprt *xprt = task->tk_xprt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 994 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 995 | task->tk_pid, xprt, |
| 996 | (xprt_connected(xprt) ? "is" : "is not")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 998 | task->tk_action = call_transmit; |
| 999 | if (!xprt_connected(xprt)) { |
| 1000 | task->tk_action = call_connect_status; |
| 1001 | if (task->tk_status < 0) |
| 1002 | return; |
| 1003 | xprt_connect(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | } |
| 1006 | |
| 1007 | /* |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1008 | * 4c. Sort out connect result |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | */ |
| 1010 | static void |
| 1011 | call_connect_status(struct rpc_task *task) |
| 1012 | { |
| 1013 | struct rpc_clnt *clnt = task->tk_client; |
| 1014 | int status = task->tk_status; |
| 1015 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1016 | dprint_status(task); |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1017 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | task->tk_status = 0; |
| 1019 | if (status >= 0) { |
| 1020 | clnt->cl_stats->netreconn++; |
| 1021 | task->tk_action = call_transmit; |
| 1022 | return; |
| 1023 | } |
| 1024 | |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1025 | /* Something failed: remote service port may have changed */ |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 1026 | rpc_force_rebind(clnt); |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1027 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | switch (status) { |
| 1029 | case -ENOTCONN: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | case -EAGAIN: |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1031 | task->tk_action = call_bind; |
Trond Myklebust | da45828e | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 1032 | if (!RPC_IS_SOFT(task)) |
| 1033 | return; |
| 1034 | /* if soft mounted, test if we've timed out */ |
| 1035 | case -ETIMEDOUT: |
| 1036 | task->tk_action = call_timeout; |
| 1037 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | } |
Trond Myklebust | da45828e | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 1039 | rpc_exit(task, -EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | } |
| 1041 | |
| 1042 | /* |
| 1043 | * 5. Transmit the RPC request, and wait for reply |
| 1044 | */ |
| 1045 | static void |
| 1046 | call_transmit(struct rpc_task *task) |
| 1047 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1048 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | |
| 1050 | task->tk_action = call_status; |
| 1051 | if (task->tk_status < 0) |
| 1052 | return; |
| 1053 | task->tk_status = xprt_prepare_transmit(task); |
| 1054 | if (task->tk_status != 0) |
| 1055 | return; |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1056 | task->tk_action = call_transmit_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
Trond Myklebust | 940e331 | 2005-11-09 21:45:24 -0500 | [diff] [blame] | 1058 | if (rpc_task_need_encode(task)) { |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1059 | BUG_ON(task->tk_rqstp->rq_bytes_sent != 0); |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1060 | rpc_xdr_encode(task); |
Trond Myklebust | 5e5ce5b | 2005-10-18 14:20:11 -0700 | [diff] [blame] | 1061 | /* Did the encode result in an error condition? */ |
Trond Myklebust | 8b39f2b | 2008-05-14 19:48:25 -0700 | [diff] [blame] | 1062 | if (task->tk_status != 0) { |
| 1063 | /* Was the error nonfatal? */ |
| 1064 | if (task->tk_status == -EAGAIN) |
| 1065 | rpc_delay(task, HZ >> 4); |
| 1066 | else |
| 1067 | rpc_exit(task, task->tk_status); |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1068 | return; |
Trond Myklebust | 8b39f2b | 2008-05-14 19:48:25 -0700 | [diff] [blame] | 1069 | } |
Trond Myklebust | 5e5ce5b | 2005-10-18 14:20:11 -0700 | [diff] [blame] | 1070 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | xprt_transmit(task); |
| 1072 | if (task->tk_status < 0) |
| 1073 | return; |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1074 | /* |
| 1075 | * On success, ensure that we call xprt_end_transmit() before sleeping |
| 1076 | * in order to allow access to the socket to other RPC requests. |
| 1077 | */ |
| 1078 | call_transmit_status(task); |
| 1079 | if (task->tk_msg.rpc_proc->p_decode != NULL) |
| 1080 | return; |
| 1081 | task->tk_action = rpc_exit_task; |
Trond Myklebust | fda1393 | 2008-02-22 16:34:12 -0500 | [diff] [blame] | 1082 | rpc_wake_up_queued_task(&task->tk_xprt->pending, task); |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1083 | } |
| 1084 | |
| 1085 | /* |
| 1086 | * 5a. Handle cleanup after a transmission |
| 1087 | */ |
| 1088 | static void |
| 1089 | call_transmit_status(struct rpc_task *task) |
| 1090 | { |
| 1091 | task->tk_action = call_status; |
| 1092 | /* |
| 1093 | * Special case: if we've been waiting on the socket's write_space() |
| 1094 | * callback, then don't call xprt_end_transmit(). |
| 1095 | */ |
| 1096 | if (task->tk_status == -EAGAIN) |
| 1097 | return; |
| 1098 | xprt_end_transmit(task); |
Trond Myklebust | 940e331 | 2005-11-09 21:45:24 -0500 | [diff] [blame] | 1099 | rpc_task_force_reencode(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | } |
| 1101 | |
| 1102 | /* |
| 1103 | * 6. Sort out the RPC call status |
| 1104 | */ |
| 1105 | static void |
| 1106 | call_status(struct rpc_task *task) |
| 1107 | { |
| 1108 | struct rpc_clnt *clnt = task->tk_client; |
| 1109 | struct rpc_rqst *req = task->tk_rqstp; |
| 1110 | int status; |
| 1111 | |
| 1112 | if (req->rq_received > 0 && !req->rq_bytes_sent) |
| 1113 | task->tk_status = req->rq_received; |
| 1114 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1115 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | |
| 1117 | status = task->tk_status; |
| 1118 | if (status >= 0) { |
| 1119 | task->tk_action = call_decode; |
| 1120 | return; |
| 1121 | } |
| 1122 | |
| 1123 | task->tk_status = 0; |
| 1124 | switch(status) { |
Trond Myklebust | 7630399 | 2006-08-30 14:32:49 -0400 | [diff] [blame] | 1125 | case -EHOSTDOWN: |
| 1126 | case -EHOSTUNREACH: |
| 1127 | case -ENETUNREACH: |
| 1128 | /* |
| 1129 | * Delay any retries for 3 seconds, then handle as if it |
| 1130 | * were a timeout. |
| 1131 | */ |
| 1132 | rpc_delay(task, 3*HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | case -ETIMEDOUT: |
| 1134 | task->tk_action = call_timeout; |
Trond Myklebust | 241c39b | 2007-04-20 16:12:55 -0400 | [diff] [blame] | 1135 | if (task->tk_client->cl_discrtry) |
Trond Myklebust | 7c1d71c | 2008-04-17 16:52:57 -0400 | [diff] [blame] | 1136 | xprt_conditional_disconnect(task->tk_xprt, |
| 1137 | req->rq_connect_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | break; |
| 1139 | case -ECONNREFUSED: |
| 1140 | case -ENOTCONN: |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 1141 | rpc_force_rebind(clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | task->tk_action = call_bind; |
| 1143 | break; |
| 1144 | case -EAGAIN: |
| 1145 | task->tk_action = call_transmit; |
| 1146 | break; |
| 1147 | case -EIO: |
| 1148 | /* shutdown or soft timeout */ |
| 1149 | rpc_exit(task, status); |
| 1150 | break; |
| 1151 | default: |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 1152 | if (clnt->cl_chatty) |
| 1153 | printk("%s: RPC call returned error %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | clnt->cl_protname, -status); |
| 1155 | rpc_exit(task, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | } |
| 1157 | } |
| 1158 | |
| 1159 | /* |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1160 | * 6a. Handle RPC timeout |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | * We do not release the request slot, so we keep using the |
| 1162 | * same XID for all retransmits. |
| 1163 | */ |
| 1164 | static void |
| 1165 | call_timeout(struct rpc_task *task) |
| 1166 | { |
| 1167 | struct rpc_clnt *clnt = task->tk_client; |
| 1168 | |
| 1169 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1170 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | goto retry; |
| 1172 | } |
| 1173 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1174 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
Chuck Lever | ef759a2 | 2006-03-20 13:44:17 -0500 | [diff] [blame] | 1175 | task->tk_timeouts++; |
| 1176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | if (RPC_IS_SOFT(task)) { |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 1178 | if (clnt->cl_chatty) |
| 1179 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | clnt->cl_protname, clnt->cl_server); |
| 1181 | rpc_exit(task, -EIO); |
| 1182 | return; |
| 1183 | } |
| 1184 | |
Chuck Lever | f518e35a | 2006-01-03 09:55:52 +0100 | [diff] [blame] | 1185 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 1187 | if (clnt->cl_chatty) |
| 1188 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | clnt->cl_protname, clnt->cl_server); |
| 1190 | } |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 1191 | rpc_force_rebind(clnt); |
Trond Myklebust | b48633b | 2008-04-22 16:47:55 -0400 | [diff] [blame] | 1192 | /* |
| 1193 | * Did our request time out due to an RPCSEC_GSS out-of-sequence |
| 1194 | * event? RFC2203 requires the server to drop all such requests. |
| 1195 | */ |
| 1196 | rpcauth_invalcred(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | |
| 1198 | retry: |
| 1199 | clnt->cl_stats->rpcretrans++; |
| 1200 | task->tk_action = call_bind; |
| 1201 | task->tk_status = 0; |
| 1202 | } |
| 1203 | |
| 1204 | /* |
| 1205 | * 7. Decode the RPC reply |
| 1206 | */ |
| 1207 | static void |
| 1208 | call_decode(struct rpc_task *task) |
| 1209 | { |
| 1210 | struct rpc_clnt *clnt = task->tk_client; |
| 1211 | struct rpc_rqst *req = task->tk_rqstp; |
| 1212 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1213 | __be32 *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1215 | dprintk("RPC: %5u call_decode (status %d)\n", |
| 1216 | task->tk_pid, task->tk_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | |
Chuck Lever | f518e35a | 2006-01-03 09:55:52 +0100 | [diff] [blame] | 1218 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 1219 | if (clnt->cl_chatty) |
| 1220 | printk(KERN_NOTICE "%s: server %s OK\n", |
| 1221 | clnt->cl_protname, clnt->cl_server); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
| 1223 | } |
| 1224 | |
Trond Myklebust | 43ac3f2 | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 1225 | /* |
| 1226 | * Ensure that we see all writes made by xprt_complete_rqst() |
| 1227 | * before it changed req->rq_received. |
| 1228 | */ |
| 1229 | smp_rmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
| 1231 | |
| 1232 | /* Check that the softirq receive buffer is valid */ |
| 1233 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, |
| 1234 | sizeof(req->rq_rcv_buf)) != 0); |
| 1235 | |
Trond Myklebust | 1e799b6 | 2008-03-21 16:19:41 -0400 | [diff] [blame] | 1236 | if (req->rq_rcv_buf.len < 12) { |
| 1237 | if (!RPC_IS_SOFT(task)) { |
| 1238 | task->tk_action = call_bind; |
| 1239 | clnt->cl_stats->rpcretrans++; |
| 1240 | goto out_retry; |
| 1241 | } |
| 1242 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", |
| 1243 | clnt->cl_protname, task->tk_status); |
| 1244 | task->tk_action = call_timeout; |
| 1245 | goto out_retry; |
| 1246 | } |
| 1247 | |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1248 | p = rpc_verify_header(task); |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1249 | if (IS_ERR(p)) { |
| 1250 | if (p == ERR_PTR(-EAGAIN)) |
| 1251 | goto out_retry; |
| 1252 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | } |
| 1254 | |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1255 | task->tk_action = rpc_exit_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | |
Trond Myklebust | 6d5fcb5 | 2006-10-18 16:01:06 -0400 | [diff] [blame] | 1257 | if (decode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
| 1259 | task->tk_msg.rpc_resp); |
Trond Myklebust | 6d5fcb5 | 2006-10-18 16:01:06 -0400 | [diff] [blame] | 1260 | } |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1261 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
| 1262 | task->tk_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | return; |
| 1264 | out_retry: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | task->tk_status = 0; |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1266 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
Trond Myklebust | 24b74bf | 2008-04-19 13:15:47 -0400 | [diff] [blame] | 1267 | if (task->tk_rqstp == req) { |
Trond Myklebust | 1e799b6 | 2008-03-21 16:19:41 -0400 | [diff] [blame] | 1268 | req->rq_received = req->rq_rcv_buf.len = 0; |
Trond Myklebust | 24b74bf | 2008-04-19 13:15:47 -0400 | [diff] [blame] | 1269 | if (task->tk_client->cl_discrtry) |
Trond Myklebust | 7c1d71c | 2008-04-17 16:52:57 -0400 | [diff] [blame] | 1270 | xprt_conditional_disconnect(task->tk_xprt, |
| 1271 | req->rq_connect_cookie); |
Trond Myklebust | 24b74bf | 2008-04-19 13:15:47 -0400 | [diff] [blame] | 1272 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | } |
| 1274 | |
| 1275 | /* |
| 1276 | * 8. Refresh the credentials if rejected by the server |
| 1277 | */ |
| 1278 | static void |
| 1279 | call_refresh(struct rpc_task *task) |
| 1280 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1281 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | task->tk_action = call_refreshresult; |
| 1284 | task->tk_status = 0; |
| 1285 | task->tk_client->cl_stats->rpcauthrefresh++; |
| 1286 | rpcauth_refreshcred(task); |
| 1287 | } |
| 1288 | |
| 1289 | /* |
| 1290 | * 8a. Process the results of a credential refresh |
| 1291 | */ |
| 1292 | static void |
| 1293 | call_refreshresult(struct rpc_task *task) |
| 1294 | { |
| 1295 | int status = task->tk_status; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1296 | |
| 1297 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | |
| 1299 | task->tk_status = 0; |
| 1300 | task->tk_action = call_reserve; |
| 1301 | if (status >= 0 && rpcauth_uptodatecred(task)) |
| 1302 | return; |
| 1303 | if (status == -EACCES) { |
| 1304 | rpc_exit(task, -EACCES); |
| 1305 | return; |
| 1306 | } |
| 1307 | task->tk_action = call_refresh; |
| 1308 | if (status != -ETIMEDOUT) |
| 1309 | rpc_delay(task, 3*HZ); |
| 1310 | return; |
| 1311 | } |
| 1312 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1313 | static __be32 * |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1314 | rpc_encode_header(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | { |
| 1316 | struct rpc_clnt *clnt = task->tk_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | struct rpc_rqst *req = task->tk_rqstp; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1318 | __be32 *p = req->rq_svec[0].iov_base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | |
| 1320 | /* FIXME: check buffer size? */ |
Chuck Lever | 808012f | 2005-08-25 16:25:49 -0700 | [diff] [blame] | 1321 | |
| 1322 | p = xprt_skip_transport_header(task->tk_xprt, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | *p++ = req->rq_xid; /* XID */ |
| 1324 | *p++ = htonl(RPC_CALL); /* CALL */ |
| 1325 | *p++ = htonl(RPC_VERSION); /* RPC version */ |
| 1326 | *p++ = htonl(clnt->cl_prog); /* program number */ |
| 1327 | *p++ = htonl(clnt->cl_vers); /* program version */ |
| 1328 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ |
Trond Myklebust | 334ccfd | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 1329 | p = rpcauth_marshcred(task, p); |
| 1330 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); |
| 1331 | return p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | } |
| 1333 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1334 | static __be32 * |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1335 | rpc_verify_header(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | { |
| 1337 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; |
| 1338 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1339 | __be32 *p = iov->iov_base; |
| 1340 | u32 n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | int error = -EACCES; |
| 1342 | |
David Howells | e889649 | 2006-08-24 15:44:19 -0400 | [diff] [blame] | 1343 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
| 1344 | /* RFC-1014 says that the representation of XDR data must be a |
| 1345 | * multiple of four bytes |
| 1346 | * - if it isn't pointer subtraction in the NFS client may give |
| 1347 | * undefined results |
| 1348 | */ |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1349 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1350 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1351 | task->tk_rqstp->rq_rcv_buf.len); |
David Howells | e889649 | 2006-08-24 15:44:19 -0400 | [diff] [blame] | 1352 | goto out_eio; |
| 1353 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | if ((len -= 3) < 0) |
| 1355 | goto out_overflow; |
| 1356 | p += 1; /* skip XID */ |
| 1357 | |
| 1358 | if ((n = ntohl(*p++)) != RPC_REPLY) { |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1359 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1360 | task->tk_pid, __func__, n); |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1361 | goto out_garbage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | } |
| 1363 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
| 1364 | if (--len < 0) |
| 1365 | goto out_overflow; |
| 1366 | switch ((n = ntohl(*p++))) { |
| 1367 | case RPC_AUTH_ERROR: |
| 1368 | break; |
| 1369 | case RPC_MISMATCH: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1370 | dprintk("RPC: %5u %s: RPC call version " |
| 1371 | "mismatch!\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1372 | task->tk_pid, __func__); |
Andreas Gruenbacher | cdf4770 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 1373 | error = -EPROTONOSUPPORT; |
| 1374 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | default: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1376 | dprintk("RPC: %5u %s: RPC call rejected, " |
| 1377 | "unknown error: %x\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1378 | task->tk_pid, __func__, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | goto out_eio; |
| 1380 | } |
| 1381 | if (--len < 0) |
| 1382 | goto out_overflow; |
| 1383 | switch ((n = ntohl(*p++))) { |
| 1384 | case RPC_AUTH_REJECTEDCRED: |
| 1385 | case RPC_AUTH_REJECTEDVERF: |
| 1386 | case RPCSEC_GSS_CREDPROBLEM: |
| 1387 | case RPCSEC_GSS_CTXPROBLEM: |
| 1388 | if (!task->tk_cred_retry) |
| 1389 | break; |
| 1390 | task->tk_cred_retry--; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1391 | dprintk("RPC: %5u %s: retry stale creds\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1392 | task->tk_pid, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | rpcauth_invalcred(task); |
Trond Myklebust | 220bcc2 | 2007-10-01 12:06:48 -0400 | [diff] [blame] | 1394 | /* Ensure we obtain a new XID! */ |
| 1395 | xprt_release(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | task->tk_action = call_refresh; |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1397 | goto out_retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | case RPC_AUTH_BADCRED: |
| 1399 | case RPC_AUTH_BADVERF: |
| 1400 | /* possibly garbled cred/verf? */ |
| 1401 | if (!task->tk_garb_retry) |
| 1402 | break; |
| 1403 | task->tk_garb_retry--; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1404 | dprintk("RPC: %5u %s: retry garbled creds\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1405 | task->tk_pid, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | task->tk_action = call_bind; |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1407 | goto out_retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | case RPC_AUTH_TOOWEAK: |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1409 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
Levent Serinol | 1356b8c | 2006-03-20 13:44:11 -0500 | [diff] [blame] | 1410 | "authentication.\n", task->tk_client->cl_server); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | break; |
| 1412 | default: |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1413 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1414 | task->tk_pid, __func__, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | error = -EIO; |
| 1416 | } |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1417 | dprintk("RPC: %5u %s: call rejected %d\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1418 | task->tk_pid, __func__, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | goto out_err; |
| 1420 | } |
| 1421 | if (!(p = rpcauth_checkverf(task, p))) { |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1422 | dprintk("RPC: %5u %s: auth check failed\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1423 | task->tk_pid, __func__); |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1424 | goto out_garbage; /* bad verifier, retry */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | } |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1426 | len = p - (__be32 *)iov->iov_base - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | if (len < 0) |
| 1428 | goto out_overflow; |
| 1429 | switch ((n = ntohl(*p++))) { |
| 1430 | case RPC_SUCCESS: |
| 1431 | return p; |
| 1432 | case RPC_PROG_UNAVAIL: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1433 | dprintk("RPC: %5u %s: program %u is unsupported by server %s\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1434 | task->tk_pid, __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | (unsigned int)task->tk_client->cl_prog, |
| 1436 | task->tk_client->cl_server); |
Andreas Gruenbacher | cdf4770 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 1437 | error = -EPFNOSUPPORT; |
| 1438 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | case RPC_PROG_MISMATCH: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1440 | dprintk("RPC: %5u %s: program %u, version %u unsupported by " |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1441 | "server %s\n", task->tk_pid, __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | (unsigned int)task->tk_client->cl_prog, |
| 1443 | (unsigned int)task->tk_client->cl_vers, |
| 1444 | task->tk_client->cl_server); |
Andreas Gruenbacher | cdf4770 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 1445 | error = -EPROTONOSUPPORT; |
| 1446 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | case RPC_PROC_UNAVAIL: |
Chuck Lever | 3748f1e | 2008-05-21 17:09:12 -0400 | [diff] [blame] | 1448 | dprintk("RPC: %5u %s: proc %s unsupported by program %u, " |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1449 | "version %u on server %s\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1450 | task->tk_pid, __func__, |
Chuck Lever | 3748f1e | 2008-05-21 17:09:12 -0400 | [diff] [blame] | 1451 | rpc_proc_name(task), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | task->tk_client->cl_prog, |
| 1453 | task->tk_client->cl_vers, |
| 1454 | task->tk_client->cl_server); |
Andreas Gruenbacher | cdf4770 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 1455 | error = -EOPNOTSUPP; |
| 1456 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | case RPC_GARBAGE_ARGS: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1458 | dprintk("RPC: %5u %s: server saw garbage\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1459 | task->tk_pid, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | break; /* retry */ |
| 1461 | default: |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1462 | dprintk("RPC: %5u %s: server accept status: %x\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1463 | task->tk_pid, __func__, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | /* Also retry */ |
| 1465 | } |
| 1466 | |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1467 | out_garbage: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | task->tk_client->cl_stats->rpcgarbage++; |
| 1469 | if (task->tk_garb_retry) { |
| 1470 | task->tk_garb_retry--; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1471 | dprintk("RPC: %5u %s: retrying\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1472 | task->tk_pid, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | task->tk_action = call_bind; |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1474 | out_retry: |
| 1475 | return ERR_PTR(-EAGAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1477 | out_eio: |
| 1478 | error = -EIO; |
| 1479 | out_err: |
| 1480 | rpc_exit(task, error); |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1481 | 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] | 1482 | __func__, error); |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1483 | return ERR_PTR(error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | out_overflow: |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1485 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1486 | __func__); |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1487 | goto out_garbage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | } |
Trond Myklebust | 5ee0ed7 | 2005-06-22 17:16:20 +0000 | [diff] [blame] | 1489 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1490 | static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj) |
Trond Myklebust | 5ee0ed7 | 2005-06-22 17:16:20 +0000 | [diff] [blame] | 1491 | { |
| 1492 | return 0; |
| 1493 | } |
| 1494 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1495 | static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj) |
Trond Myklebust | 5ee0ed7 | 2005-06-22 17:16:20 +0000 | [diff] [blame] | 1496 | { |
| 1497 | return 0; |
| 1498 | } |
| 1499 | |
| 1500 | static struct rpc_procinfo rpcproc_null = { |
| 1501 | .p_encode = rpcproc_encode_null, |
| 1502 | .p_decode = rpcproc_decode_null, |
| 1503 | }; |
| 1504 | |
Trond Myklebust | 64c91a1 | 2007-06-23 10:17:16 -0400 | [diff] [blame] | 1505 | static int rpc_ping(struct rpc_clnt *clnt, int flags) |
Trond Myklebust | 5ee0ed7 | 2005-06-22 17:16:20 +0000 | [diff] [blame] | 1506 | { |
| 1507 | struct rpc_message msg = { |
| 1508 | .rpc_proc = &rpcproc_null, |
| 1509 | }; |
| 1510 | int err; |
| 1511 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); |
| 1512 | err = rpc_call_sync(clnt, &msg, flags); |
| 1513 | put_rpccred(msg.rpc_cred); |
| 1514 | return err; |
| 1515 | } |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1516 | |
Trond Myklebust | 5e1550d | 2007-06-23 10:17:16 -0400 | [diff] [blame] | 1517 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
| 1518 | { |
| 1519 | struct rpc_message msg = { |
| 1520 | .rpc_proc = &rpcproc_null, |
| 1521 | .rpc_cred = cred, |
| 1522 | }; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1523 | struct rpc_task_setup task_setup_data = { |
| 1524 | .rpc_client = clnt, |
| 1525 | .rpc_message = &msg, |
| 1526 | .callback_ops = &rpc_default_ops, |
| 1527 | .flags = flags, |
| 1528 | }; |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1529 | return rpc_run_task(&task_setup_data); |
Trond Myklebust | 5e1550d | 2007-06-23 10:17:16 -0400 | [diff] [blame] | 1530 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1531 | EXPORT_SYMBOL_GPL(rpc_call_null); |
Trond Myklebust | 5e1550d | 2007-06-23 10:17:16 -0400 | [diff] [blame] | 1532 | |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1533 | #ifdef RPC_DEBUG |
Chuck Lever | 68a23ee | 2008-05-21 17:09:26 -0400 | [diff] [blame] | 1534 | static void rpc_show_header(void) |
| 1535 | { |
Chuck Lever | cb3997b | 2008-05-21 17:09:41 -0400 | [diff] [blame] | 1536 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
| 1537 | "-timeout ---ops--\n"); |
Chuck Lever | 68a23ee | 2008-05-21 17:09:26 -0400 | [diff] [blame] | 1538 | } |
| 1539 | |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1540 | static void rpc_show_task(const struct rpc_clnt *clnt, |
| 1541 | const struct rpc_task *task) |
| 1542 | { |
| 1543 | const char *rpc_waitq = "none"; |
Chuck Lever | cb3997b | 2008-05-21 17:09:41 -0400 | [diff] [blame] | 1544 | char *p, action[KSYM_SYMBOL_LEN]; |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1545 | |
| 1546 | if (RPC_IS_QUEUED(task)) |
| 1547 | rpc_waitq = rpc_qname(task->tk_waitqueue); |
| 1548 | |
Chuck Lever | cb3997b | 2008-05-21 17:09:41 -0400 | [diff] [blame] | 1549 | /* map tk_action pointer to a function name; then trim off |
| 1550 | * the "+0x0 [sunrpc]" */ |
| 1551 | sprint_symbol(action, (unsigned long)task->tk_action); |
| 1552 | p = strchr(action, '+'); |
| 1553 | if (p) |
| 1554 | *p = '\0'; |
| 1555 | |
| 1556 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%s q:%s\n", |
| 1557 | task->tk_pid, task->tk_flags, task->tk_status, |
| 1558 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, |
| 1559 | clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task), |
| 1560 | action, rpc_waitq); |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1561 | } |
| 1562 | |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1563 | void rpc_show_tasks(void) |
| 1564 | { |
| 1565 | struct rpc_clnt *clnt; |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1566 | struct rpc_task *task; |
Chuck Lever | 68a23ee | 2008-05-21 17:09:26 -0400 | [diff] [blame] | 1567 | int header = 0; |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1568 | |
| 1569 | spin_lock(&rpc_client_lock); |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1570 | list_for_each_entry(clnt, &all_clients, cl_clients) { |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1571 | spin_lock(&clnt->cl_lock); |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1572 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
Chuck Lever | 68a23ee | 2008-05-21 17:09:26 -0400 | [diff] [blame] | 1573 | if (!header) { |
| 1574 | rpc_show_header(); |
| 1575 | header++; |
| 1576 | } |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1577 | rpc_show_task(clnt, task); |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1578 | } |
| 1579 | spin_unlock(&clnt->cl_lock); |
| 1580 | } |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1581 | spin_unlock(&rpc_client_lock); |
| 1582 | } |
| 1583 | #endif |