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> |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 39 | #include <linux/sunrpc/bc_xprt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 41 | #include "sunrpc.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #ifdef RPC_DEBUG |
| 44 | # define RPCDBG_FACILITY RPCDBG_CALL |
| 45 | #endif |
| 46 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 47 | #define dprint_status(t) \ |
| 48 | dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 49 | __func__, t->tk_status) |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 50 | |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 51 | /* |
| 52 | * All RPC clients are linked into this list |
| 53 | */ |
| 54 | static LIST_HEAD(all_clients); |
| 55 | static DEFINE_SPINLOCK(rpc_client_lock); |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
| 58 | |
| 59 | |
| 60 | static void call_start(struct rpc_task *task); |
| 61 | static void call_reserve(struct rpc_task *task); |
| 62 | static void call_reserveresult(struct rpc_task *task); |
| 63 | static void call_allocate(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | static void call_decode(struct rpc_task *task); |
| 65 | static void call_bind(struct rpc_task *task); |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 66 | static void call_bind_status(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | static void call_transmit(struct rpc_task *task); |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 68 | #if defined(CONFIG_NFS_V4_1) |
| 69 | static void call_bc_transmit(struct rpc_task *task); |
| 70 | #endif /* CONFIG_NFS_V4_1 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | static void call_status(struct rpc_task *task); |
Trond Myklebust | 940e331 | 2005-11-09 21:45:24 -0500 | [diff] [blame] | 72 | static void call_transmit_status(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | static void call_refresh(struct rpc_task *task); |
| 74 | static void call_refreshresult(struct rpc_task *task); |
| 75 | static void call_timeout(struct rpc_task *task); |
| 76 | static void call_connect(struct rpc_task *task); |
| 77 | static void call_connect_status(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 79 | static __be32 *rpc_encode_header(struct rpc_task *task); |
| 80 | static __be32 *rpc_verify_header(struct rpc_task *task); |
Trond Myklebust | 64c91a1 | 2007-06-23 10:17:16 -0400 | [diff] [blame] | 81 | static int rpc_ping(struct rpc_clnt *clnt, int flags); |
| 82 | |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 83 | static void rpc_register_client(struct rpc_clnt *clnt) |
| 84 | { |
| 85 | spin_lock(&rpc_client_lock); |
| 86 | list_add(&clnt->cl_clients, &all_clients); |
| 87 | spin_unlock(&rpc_client_lock); |
| 88 | } |
| 89 | |
| 90 | static void rpc_unregister_client(struct rpc_clnt *clnt) |
| 91 | { |
| 92 | spin_lock(&rpc_client_lock); |
| 93 | list_del(&clnt->cl_clients); |
| 94 | spin_unlock(&rpc_client_lock); |
| 95 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
| 97 | static int |
| 98 | rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) |
| 99 | { |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 100 | static uint32_t clntid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | int error; |
| 102 | |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 103 | clnt->cl_vfsmnt = ERR_PTR(-ENOENT); |
| 104 | clnt->cl_dentry = ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | if (dir_name == NULL) |
| 106 | return 0; |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 107 | |
| 108 | clnt->cl_vfsmnt = rpc_get_mount(); |
| 109 | if (IS_ERR(clnt->cl_vfsmnt)) |
| 110 | return PTR_ERR(clnt->cl_vfsmnt); |
| 111 | |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 112 | for (;;) { |
| 113 | snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname), |
| 114 | "%s/clnt%x", dir_name, |
| 115 | (unsigned int)clntid++); |
| 116 | clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; |
| 117 | clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt); |
| 118 | if (!IS_ERR(clnt->cl_dentry)) |
| 119 | return 0; |
Christoph Hellwig | 278c995 | 2005-07-24 23:53:01 +0100 | [diff] [blame] | 120 | error = PTR_ERR(clnt->cl_dentry); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 121 | if (error != -EEXIST) { |
| 122 | printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n", |
| 123 | clnt->cl_pathname, error); |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 124 | rpc_put_mount(); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 125 | return error; |
| 126 | } |
Christoph Hellwig | 278c995 | 2005-07-24 23:53:01 +0100 | [diff] [blame] | 127 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | } |
| 129 | |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 130 | 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] | 131 | { |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 132 | struct rpc_program *program = args->program; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | struct rpc_version *version; |
| 134 | struct rpc_clnt *clnt = NULL; |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 135 | struct rpc_auth *auth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | int err; |
Chuck Lever | 06b8d25 | 2007-09-11 18:00:20 -0400 | [diff] [blame] | 137 | size_t len; |
| 138 | |
| 139 | /* sanity check the name before trying to print it */ |
| 140 | err = -EINVAL; |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 141 | len = strlen(args->servername); |
Chuck Lever | 06b8d25 | 2007-09-11 18:00:20 -0400 | [diff] [blame] | 142 | if (len > RPC_MAXNETNAMELEN) |
| 143 | goto out_no_rpciod; |
| 144 | len++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 146 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 147 | program->name, args->servername, xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Trond Myklebust | 4ada539 | 2007-06-14 17:26:17 -0400 | [diff] [blame] | 149 | err = rpciod_up(); |
| 150 | if (err) |
| 151 | goto out_no_rpciod; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | err = -EINVAL; |
| 153 | if (!xprt) |
Adrian Bunk | 712917d | 2006-03-13 21:20:47 -0800 | [diff] [blame] | 154 | goto out_no_xprt; |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 155 | |
| 156 | if (args->version >= program->nrvers) |
| 157 | goto out_err; |
| 158 | version = program->version[args->version]; |
| 159 | if (version == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | goto out_err; |
| 161 | |
| 162 | err = -ENOMEM; |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 163 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | if (!clnt) |
| 165 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | clnt->cl_parent = clnt; |
| 167 | |
| 168 | clnt->cl_server = clnt->cl_inline_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | if (len > sizeof(clnt->cl_inline_name)) { |
| 170 | char *buf = kmalloc(len, GFP_KERNEL); |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 171 | if (buf != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | clnt->cl_server = buf; |
| 173 | else |
| 174 | len = sizeof(clnt->cl_inline_name); |
| 175 | } |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 176 | strlcpy(clnt->cl_server, args->servername, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
| 178 | clnt->cl_xprt = xprt; |
| 179 | clnt->cl_procinfo = version->procs; |
| 180 | clnt->cl_maxproc = version->nrprocs; |
| 181 | clnt->cl_protname = program->name; |
Benny Halevy | d5b337b | 2008-09-28 09:21:26 +0300 | [diff] [blame] | 182 | clnt->cl_prog = args->prognumber ? : program->number; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | clnt->cl_vers = version->number; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | clnt->cl_stats = program->stats; |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 185 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
Trond Myklebust | 23bf85b | 2006-11-21 10:40:23 -0500 | [diff] [blame] | 186 | err = -ENOMEM; |
| 187 | if (clnt->cl_metrics == NULL) |
| 188 | goto out_no_stats; |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 189 | clnt->cl_program = program; |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 190 | INIT_LIST_HEAD(&clnt->cl_tasks); |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 191 | spin_lock_init(&clnt->cl_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 193 | if (!xprt_bound(clnt->cl_xprt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | clnt->cl_autobind = 1; |
| 195 | |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 196 | clnt->cl_timeout = xprt->timeout; |
| 197 | if (args->timeout != NULL) { |
| 198 | memcpy(&clnt->cl_timeout_default, args->timeout, |
| 199 | sizeof(clnt->cl_timeout_default)); |
| 200 | clnt->cl_timeout = &clnt->cl_timeout_default; |
| 201 | } |
| 202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | clnt->cl_rtt = &clnt->cl_rtt_default; |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 204 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
Olga Kornievskaia | 608207e | 2008-12-23 16:17:40 -0500 | [diff] [blame] | 205 | clnt->cl_principal = NULL; |
| 206 | if (args->client_name) { |
| 207 | clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL); |
| 208 | if (!clnt->cl_principal) |
| 209 | goto out_no_principal; |
| 210 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 212 | kref_init(&clnt->cl_kref); |
| 213 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); |
| 215 | if (err < 0) |
| 216 | goto out_no_path; |
| 217 | |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 218 | auth = rpcauth_create(args->authflavor, clnt); |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 219 | if (IS_ERR(auth)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 221 | args->authflavor); |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 222 | err = PTR_ERR(auth); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | goto out_no_auth; |
| 224 | } |
| 225 | |
| 226 | /* save the nodename */ |
Cedric Le Goater | 63ffc23 | 2008-10-03 23:41:51 -0400 | [diff] [blame] | 227 | clnt->cl_nodelen = strlen(init_utsname()->nodename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | if (clnt->cl_nodelen > UNX_MAXNODENAME) |
| 229 | clnt->cl_nodelen = UNX_MAXNODENAME; |
Cedric Le Goater | 63ffc23 | 2008-10-03 23:41:51 -0400 | [diff] [blame] | 230 | memcpy(clnt->cl_nodename, init_utsname()->nodename, clnt->cl_nodelen); |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 231 | rpc_register_client(clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | return clnt; |
| 233 | |
| 234 | out_no_auth: |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 235 | if (!IS_ERR(clnt->cl_dentry)) { |
Trond Myklebust | dff02cc | 2006-07-31 14:17:18 -0700 | [diff] [blame] | 236 | rpc_rmdir(clnt->cl_dentry); |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 237 | rpc_put_mount(); |
| 238 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | out_no_path: |
Olga Kornievskaia | 608207e | 2008-12-23 16:17:40 -0500 | [diff] [blame] | 240 | kfree(clnt->cl_principal); |
| 241 | out_no_principal: |
Trond Myklebust | 23bf85b | 2006-11-21 10:40:23 -0500 | [diff] [blame] | 242 | rpc_free_iostats(clnt->cl_metrics); |
| 243 | out_no_stats: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | if (clnt->cl_server != clnt->cl_inline_name) |
| 245 | kfree(clnt->cl_server); |
| 246 | kfree(clnt); |
| 247 | out_err: |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 248 | xprt_put(xprt); |
Adrian Bunk | 712917d | 2006-03-13 21:20:47 -0800 | [diff] [blame] | 249 | out_no_xprt: |
Trond Myklebust | 4ada539 | 2007-06-14 17:26:17 -0400 | [diff] [blame] | 250 | rpciod_down(); |
| 251 | out_no_rpciod: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | return ERR_PTR(err); |
| 253 | } |
| 254 | |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 255 | /* |
| 256 | * rpc_create - create an RPC client and transport with one call |
| 257 | * @args: rpc_clnt create argument structure |
| 258 | * |
| 259 | * Creates and initializes an RPC transport and an RPC client. |
| 260 | * |
| 261 | * It can ping the server in order to determine if it is up, and to see if |
| 262 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables |
| 263 | * this behavior so asynchronous tasks can also use rpc_create. |
| 264 | */ |
| 265 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) |
| 266 | { |
| 267 | struct rpc_xprt *xprt; |
| 268 | struct rpc_clnt *clnt; |
\"Talpey, Thomas\ | 3c341b0 | 2007-09-10 13:47:07 -0400 | [diff] [blame] | 269 | struct xprt_create xprtargs = { |
\"Talpey, Thomas\ | 4fa016e | 2007-09-10 13:47:57 -0400 | [diff] [blame] | 270 | .ident = args->protocol, |
Frank van Maarseveen | d3bc9a1 | 2007-07-09 22:23:35 +0200 | [diff] [blame] | 271 | .srcaddr = args->saddress, |
Frank van Maarseveen | 96802a0 | 2007-07-08 13:08:54 +0200 | [diff] [blame] | 272 | .dstaddr = args->address, |
| 273 | .addrlen = args->addrsize, |
Frank van Maarseveen | 96802a0 | 2007-07-08 13:08:54 +0200 | [diff] [blame] | 274 | }; |
Chuck Lever | 510deb0 | 2007-12-10 14:56:24 -0500 | [diff] [blame] | 275 | char servername[48]; |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 276 | |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 277 | /* |
Chuck Lever | 43780b8 | 2007-07-01 12:13:22 -0400 | [diff] [blame] | 278 | * If the caller chooses not to specify a hostname, whip |
| 279 | * up a string representation of the passed-in address. |
| 280 | */ |
| 281 | if (args->servername == NULL) { |
Chuck Lever | 510deb0 | 2007-12-10 14:56:24 -0500 | [diff] [blame] | 282 | servername[0] = '\0'; |
| 283 | switch (args->address->sa_family) { |
| 284 | case AF_INET: { |
| 285 | struct sockaddr_in *sin = |
| 286 | (struct sockaddr_in *)args->address; |
Harvey Harrison | 21454aa | 2008-10-31 00:54:56 -0700 | [diff] [blame] | 287 | snprintf(servername, sizeof(servername), "%pI4", |
| 288 | &sin->sin_addr.s_addr); |
Chuck Lever | 510deb0 | 2007-12-10 14:56:24 -0500 | [diff] [blame] | 289 | break; |
| 290 | } |
| 291 | case AF_INET6: { |
| 292 | struct sockaddr_in6 *sin = |
| 293 | (struct sockaddr_in6 *)args->address; |
Harvey Harrison | 5b095d989 | 2008-10-29 12:52:50 -0700 | [diff] [blame] | 294 | snprintf(servername, sizeof(servername), "%pI6", |
Harvey Harrison | fdb46ee | 2008-10-28 16:10:17 -0700 | [diff] [blame] | 295 | &sin->sin6_addr); |
Chuck Lever | 510deb0 | 2007-12-10 14:56:24 -0500 | [diff] [blame] | 296 | break; |
| 297 | } |
| 298 | default: |
| 299 | /* caller wants default server name, but |
| 300 | * address family isn't recognized. */ |
| 301 | return ERR_PTR(-EINVAL); |
| 302 | } |
Chuck Lever | 43780b8 | 2007-07-01 12:13:22 -0400 | [diff] [blame] | 303 | args->servername = servername; |
| 304 | } |
| 305 | |
Chuck Lever | 510deb0 | 2007-12-10 14:56:24 -0500 | [diff] [blame] | 306 | xprt = xprt_create_transport(&xprtargs); |
| 307 | if (IS_ERR(xprt)) |
| 308 | return (struct rpc_clnt *)xprt; |
| 309 | |
Chuck Lever | 43780b8 | 2007-07-01 12:13:22 -0400 | [diff] [blame] | 310 | /* |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 311 | * By default, kernel RPC client connects from a reserved port. |
| 312 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, |
| 313 | * but it is always enabled for rpciod, which handles the connect |
| 314 | * operation. |
| 315 | */ |
| 316 | xprt->resvport = 1; |
| 317 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) |
| 318 | xprt->resvport = 0; |
| 319 | |
Trond Myklebust | 698b6d0 | 2007-12-20 16:03:53 -0500 | [diff] [blame] | 320 | clnt = rpc_new_client(args, xprt); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 321 | if (IS_ERR(clnt)) |
| 322 | return clnt; |
| 323 | |
| 324 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 325 | int err = rpc_ping(clnt, RPC_TASK_SOFT); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 326 | if (err != 0) { |
| 327 | rpc_shutdown_client(clnt); |
| 328 | return ERR_PTR(err); |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | clnt->cl_softrtry = 1; |
| 333 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) |
| 334 | clnt->cl_softrtry = 0; |
| 335 | |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 336 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) |
| 337 | clnt->cl_autobind = 1; |
Chuck Lever | 43d78ef | 2007-02-06 18:26:11 -0500 | [diff] [blame] | 338 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
| 339 | clnt->cl_discrtry = 1; |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 340 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) |
| 341 | clnt->cl_chatty = 1; |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 342 | |
| 343 | return clnt; |
| 344 | } |
Chuck Lever | b86acd5 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 345 | EXPORT_SYMBOL_GPL(rpc_create); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 346 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | /* |
| 348 | * This function clones the RPC client structure. It allows us to share the |
| 349 | * same transport while varying parameters such as the authentication |
| 350 | * flavour. |
| 351 | */ |
| 352 | struct rpc_clnt * |
| 353 | rpc_clone_client(struct rpc_clnt *clnt) |
| 354 | { |
| 355 | struct rpc_clnt *new; |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 356 | int err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | |
Arnaldo Carvalho de Melo | e69062b | 2006-11-21 01:21:34 -0200 | [diff] [blame] | 358 | new = kmemdup(clnt, sizeof(*new), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | if (!new) |
| 360 | goto out_no_clnt; |
Trond Myklebust | d431a555 | 2007-06-17 17:07:54 -0400 | [diff] [blame] | 361 | new->cl_parent = clnt; |
| 362 | /* Turn off autobind on clones */ |
| 363 | new->cl_autobind = 0; |
| 364 | INIT_LIST_HEAD(&new->cl_tasks); |
| 365 | spin_lock_init(&new->cl_lock); |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 366 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval); |
Trond Myklebust | 23bf85b | 2006-11-21 10:40:23 -0500 | [diff] [blame] | 367 | new->cl_metrics = rpc_alloc_iostats(clnt); |
| 368 | if (new->cl_metrics == NULL) |
| 369 | goto out_no_stats; |
Olga Kornievskaia | 608207e | 2008-12-23 16:17:40 -0500 | [diff] [blame] | 370 | if (clnt->cl_principal) { |
| 371 | new->cl_principal = kstrdup(clnt->cl_principal, GFP_KERNEL); |
| 372 | if (new->cl_principal == NULL) |
| 373 | goto out_no_principal; |
| 374 | } |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 375 | kref_init(&new->cl_kref); |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 376 | err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name); |
| 377 | if (err != 0) |
| 378 | goto out_no_path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | if (new->cl_auth) |
| 380 | atomic_inc(&new->cl_auth->au_count); |
Trond Myklebust | d431a555 | 2007-06-17 17:07:54 -0400 | [diff] [blame] | 381 | xprt_get(clnt->cl_xprt); |
| 382 | kref_get(&clnt->cl_kref); |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 383 | rpc_register_client(new); |
Trond Myklebust | 4ada539 | 2007-06-14 17:26:17 -0400 | [diff] [blame] | 384 | rpciod_up(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | return new; |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 386 | out_no_path: |
Olga Kornievskaia | 608207e | 2008-12-23 16:17:40 -0500 | [diff] [blame] | 387 | kfree(new->cl_principal); |
| 388 | out_no_principal: |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 389 | rpc_free_iostats(new->cl_metrics); |
Trond Myklebust | 23bf85b | 2006-11-21 10:40:23 -0500 | [diff] [blame] | 390 | out_no_stats: |
| 391 | kfree(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | out_no_clnt: |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 393 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 394 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 396 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | |
| 398 | /* |
| 399 | * Properly shut down an RPC client, terminating all outstanding |
Trond Myklebust | 90c5755 | 2007-06-09 19:49:36 -0400 | [diff] [blame] | 400 | * requests. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | */ |
Trond Myklebust | 4c402b4 | 2007-06-14 16:40:32 -0400 | [diff] [blame] | 402 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | { |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 404 | dprintk("RPC: shutting down %s client for %s\n", |
| 405 | clnt->cl_protname, clnt->cl_server); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 407 | while (!list_empty(&clnt->cl_tasks)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | rpc_killall_tasks(clnt); |
Ingo Molnar | 532347e | 2006-01-09 20:52:53 -0800 | [diff] [blame] | 409 | wait_event_timeout(destroy_wait, |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 410 | list_empty(&clnt->cl_tasks), 1*HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | } |
| 412 | |
Trond Myklebust | 4c402b4 | 2007-06-14 16:40:32 -0400 | [diff] [blame] | 413 | rpc_release_client(clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 415 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
| 417 | /* |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 418 | * Free an RPC client |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | */ |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 420 | static void |
| 421 | rpc_free_client(struct kref *kref) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | { |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 423 | struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 425 | dprintk("RPC: destroying %s client for %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | clnt->cl_protname, clnt->cl_server); |
Trond Myklebust | 8f8e7a5 | 2006-08-14 13:11:15 -0400 | [diff] [blame] | 427 | if (!IS_ERR(clnt->cl_dentry)) { |
Trond Myklebust | dff02cc | 2006-07-31 14:17:18 -0700 | [diff] [blame] | 428 | rpc_rmdir(clnt->cl_dentry); |
Trond Myklebust | 8f8e7a5 | 2006-08-14 13:11:15 -0400 | [diff] [blame] | 429 | rpc_put_mount(); |
| 430 | } |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 431 | if (clnt->cl_parent != clnt) { |
Trond Myklebust | 8ad7c89 | 2007-06-14 16:40:32 -0400 | [diff] [blame] | 432 | rpc_release_client(clnt->cl_parent); |
Trond Myklebust | 3e32a5d | 2006-11-16 11:37:27 -0500 | [diff] [blame] | 433 | goto out_free; |
| 434 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | if (clnt->cl_server != clnt->cl_inline_name) |
| 436 | kfree(clnt->cl_server); |
| 437 | out_free: |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 438 | rpc_unregister_client(clnt); |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 439 | rpc_free_iostats(clnt->cl_metrics); |
Olga Kornievskaia | 608207e | 2008-12-23 16:17:40 -0500 | [diff] [blame] | 440 | kfree(clnt->cl_principal); |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 441 | clnt->cl_metrics = NULL; |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 442 | xprt_put(clnt->cl_xprt); |
Trond Myklebust | 4ada539 | 2007-06-14 17:26:17 -0400 | [diff] [blame] | 443 | rpciod_down(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | kfree(clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | } |
| 446 | |
| 447 | /* |
Trond Myklebust | 1dd17ec | 2007-06-26 16:57:41 -0400 | [diff] [blame] | 448 | * Free an RPC client |
| 449 | */ |
| 450 | static void |
| 451 | rpc_free_auth(struct kref *kref) |
| 452 | { |
| 453 | struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); |
| 454 | |
| 455 | if (clnt->cl_auth == NULL) { |
| 456 | rpc_free_client(kref); |
| 457 | return; |
| 458 | } |
| 459 | |
| 460 | /* |
| 461 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to |
| 462 | * release remaining GSS contexts. This mechanism ensures |
| 463 | * that it can do so safely. |
| 464 | */ |
| 465 | kref_init(kref); |
| 466 | rpcauth_release(clnt->cl_auth); |
| 467 | clnt->cl_auth = NULL; |
| 468 | kref_put(kref, rpc_free_client); |
| 469 | } |
| 470 | |
| 471 | /* |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 472 | * Release reference to the RPC client |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | */ |
| 474 | void |
| 475 | rpc_release_client(struct rpc_clnt *clnt) |
| 476 | { |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 477 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 479 | if (list_empty(&clnt->cl_tasks)) |
| 480 | wake_up(&destroy_wait); |
Trond Myklebust | 1dd17ec | 2007-06-26 16:57:41 -0400 | [diff] [blame] | 481 | kref_put(&clnt->cl_kref, rpc_free_auth); |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 482 | } |
| 483 | |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 484 | /** |
| 485 | * 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] | 486 | * @old: old rpc_client |
| 487 | * @program: rpc program to set |
| 488 | * @vers: rpc program version |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 489 | * |
| 490 | * Clones the rpc client and sets up a new RPC program. This is mainly |
| 491 | * of use for enabling different RPC programs to share the same transport. |
| 492 | * The Sun NFSv2/v3 ACL protocol can do this. |
| 493 | */ |
| 494 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, |
| 495 | struct rpc_program *program, |
Chuck Lever | 89eb21c | 2007-09-11 18:00:09 -0400 | [diff] [blame] | 496 | u32 vers) |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 497 | { |
| 498 | struct rpc_clnt *clnt; |
| 499 | struct rpc_version *version; |
| 500 | int err; |
| 501 | |
| 502 | BUG_ON(vers >= program->nrvers || !program->version[vers]); |
| 503 | version = program->version[vers]; |
| 504 | clnt = rpc_clone_client(old); |
| 505 | if (IS_ERR(clnt)) |
| 506 | goto out; |
| 507 | clnt->cl_procinfo = version->procs; |
| 508 | clnt->cl_maxproc = version->nrprocs; |
| 509 | clnt->cl_protname = program->name; |
| 510 | clnt->cl_prog = program->number; |
| 511 | clnt->cl_vers = version->number; |
| 512 | clnt->cl_stats = program->stats; |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 513 | err = rpc_ping(clnt, RPC_TASK_SOFT); |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 514 | if (err != 0) { |
| 515 | rpc_shutdown_client(clnt); |
| 516 | clnt = ERR_PTR(err); |
| 517 | } |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 518 | out: |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 519 | return clnt; |
| 520 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 521 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
Andreas Gruenbacher | 007e251 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 522 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | /* |
| 524 | * Default callback for async RPC calls |
| 525 | */ |
| 526 | static void |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 527 | rpc_default_callback(struct rpc_task *task, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | { |
| 529 | } |
| 530 | |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 531 | static const struct rpc_call_ops rpc_default_ops = { |
| 532 | .rpc_call_done = rpc_default_callback, |
| 533 | }; |
| 534 | |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 535 | /** |
| 536 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it |
| 537 | * @task_setup_data: pointer to task initialisation data |
| 538 | */ |
| 539 | 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] | 540 | { |
| 541 | struct rpc_task *task, *ret; |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 542 | |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 543 | task = rpc_new_task(task_setup_data); |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 544 | if (task == NULL) { |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 545 | rpc_release_calldata(task_setup_data->callback_ops, |
| 546 | task_setup_data->callback_data); |
Trond Myklebust | 5085925 | 2007-10-25 18:19:37 -0400 | [diff] [blame] | 547 | ret = ERR_PTR(-ENOMEM); |
| 548 | goto out; |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 549 | } |
| 550 | |
Trond Myklebust | b3ef8b3 | 2007-10-25 18:32:34 -0400 | [diff] [blame] | 551 | if (task->tk_status != 0) { |
| 552 | ret = ERR_PTR(task->tk_status); |
| 553 | rpc_put_task(task); |
| 554 | goto out; |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 555 | } |
| 556 | atomic_inc(&task->tk_count); |
| 557 | rpc_execute(task); |
| 558 | ret = task; |
| 559 | out: |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 560 | return ret; |
| 561 | } |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 562 | EXPORT_SYMBOL_GPL(rpc_run_task); |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 563 | |
| 564 | /** |
| 565 | * rpc_call_sync - Perform a synchronous RPC call |
| 566 | * @clnt: pointer to RPC client |
| 567 | * @msg: RPC call parameters |
| 568 | * @flags: RPC call flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | */ |
Trond Myklebust | cbc2005 | 2008-02-14 11:11:30 -0500 | [diff] [blame] | 570 | 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] | 571 | { |
| 572 | struct rpc_task *task; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 573 | struct rpc_task_setup task_setup_data = { |
| 574 | .rpc_client = clnt, |
| 575 | .rpc_message = msg, |
| 576 | .callback_ops = &rpc_default_ops, |
| 577 | .flags = flags, |
| 578 | }; |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 579 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | BUG_ON(flags & RPC_TASK_ASYNC); |
| 582 | |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 583 | task = rpc_run_task(&task_setup_data); |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 584 | if (IS_ERR(task)) |
| 585 | return PTR_ERR(task); |
Trond Myklebust | e60859a | 2006-01-03 09:55:10 +0100 | [diff] [blame] | 586 | status = task->tk_status; |
Trond Myklebust | bde8f00 | 2007-01-24 11:54:53 -0800 | [diff] [blame] | 587 | rpc_put_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | return status; |
| 589 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 590 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 592 | /** |
| 593 | * rpc_call_async - Perform an asynchronous RPC call |
| 594 | * @clnt: pointer to RPC client |
| 595 | * @msg: RPC call parameters |
| 596 | * @flags: RPC call flags |
Randy Dunlap | 65b6e42 | 2008-02-13 15:03:23 -0800 | [diff] [blame] | 597 | * @tk_ops: RPC call ops |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 598 | * @data: user call data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | */ |
| 600 | int |
Trond Myklebust | cbc2005 | 2008-02-14 11:11:30 -0500 | [diff] [blame] | 601 | 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] | 602 | const struct rpc_call_ops *tk_ops, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | { |
| 604 | struct rpc_task *task; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 605 | struct rpc_task_setup task_setup_data = { |
| 606 | .rpc_client = clnt, |
| 607 | .rpc_message = msg, |
| 608 | .callback_ops = tk_ops, |
| 609 | .callback_data = data, |
| 610 | .flags = flags|RPC_TASK_ASYNC, |
| 611 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 613 | task = rpc_run_task(&task_setup_data); |
Trond Myklebust | 6e5b70e | 2007-06-12 10:02:37 -0400 | [diff] [blame] | 614 | if (IS_ERR(task)) |
| 615 | return PTR_ERR(task); |
| 616 | rpc_put_task(task); |
| 617 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 619 | EXPORT_SYMBOL_GPL(rpc_call_async); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 621 | #if defined(CONFIG_NFS_V4_1) |
| 622 | /** |
| 623 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run |
| 624 | * rpc_execute against it |
| 625 | * @ops: RPC call ops |
| 626 | */ |
| 627 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req, |
| 628 | const struct rpc_call_ops *tk_ops) |
| 629 | { |
| 630 | struct rpc_task *task; |
| 631 | struct xdr_buf *xbufp = &req->rq_snd_buf; |
| 632 | struct rpc_task_setup task_setup_data = { |
| 633 | .callback_ops = tk_ops, |
| 634 | }; |
| 635 | |
| 636 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); |
| 637 | /* |
| 638 | * Create an rpc_task to send the data |
| 639 | */ |
| 640 | task = rpc_new_task(&task_setup_data); |
| 641 | if (!task) { |
| 642 | xprt_free_bc_request(req); |
| 643 | goto out; |
| 644 | } |
| 645 | task->tk_rqstp = req; |
| 646 | |
| 647 | /* |
| 648 | * Set up the xdr_buf length. |
| 649 | * This also indicates that the buffer is XDR encoded already. |
| 650 | */ |
| 651 | xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + |
| 652 | xbufp->tail[0].iov_len; |
| 653 | |
| 654 | task->tk_action = call_bc_transmit; |
| 655 | atomic_inc(&task->tk_count); |
| 656 | BUG_ON(atomic_read(&task->tk_count) != 2); |
| 657 | rpc_execute(task); |
| 658 | |
| 659 | out: |
| 660 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); |
| 661 | return task; |
| 662 | } |
| 663 | #endif /* CONFIG_NFS_V4_1 */ |
| 664 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | void |
Trond Myklebust | 77de2c5 | 2007-10-25 18:40:21 -0400 | [diff] [blame] | 666 | rpc_call_start(struct rpc_task *task) |
| 667 | { |
| 668 | task->tk_action = call_start; |
| 669 | } |
| 670 | EXPORT_SYMBOL_GPL(rpc_call_start); |
| 671 | |
Chuck Lever | ed39440 | 2006-08-22 20:06:17 -0400 | [diff] [blame] | 672 | /** |
| 673 | * rpc_peeraddr - extract remote peer address from clnt's xprt |
| 674 | * @clnt: RPC client structure |
| 675 | * @buf: target buffer |
Randy Dunlap | 65b6e42 | 2008-02-13 15:03:23 -0800 | [diff] [blame] | 676 | * @bufsize: length of target buffer |
Chuck Lever | ed39440 | 2006-08-22 20:06:17 -0400 | [diff] [blame] | 677 | * |
| 678 | * Returns the number of bytes that are actually in the stored address. |
| 679 | */ |
| 680 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) |
| 681 | { |
| 682 | size_t bytes; |
| 683 | struct rpc_xprt *xprt = clnt->cl_xprt; |
| 684 | |
| 685 | bytes = sizeof(xprt->addr); |
| 686 | if (bytes > bufsize) |
| 687 | bytes = bufsize; |
| 688 | memcpy(buf, &clnt->cl_xprt->addr, bytes); |
Chuck Lever | c4efcb1 | 2006-08-22 20:06:19 -0400 | [diff] [blame] | 689 | return xprt->addrlen; |
Chuck Lever | ed39440 | 2006-08-22 20:06:17 -0400 | [diff] [blame] | 690 | } |
Chuck Lever | b86acd5 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 691 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
Chuck Lever | ed39440 | 2006-08-22 20:06:17 -0400 | [diff] [blame] | 692 | |
Chuck Lever | f425eba | 2006-08-22 20:06:18 -0400 | [diff] [blame] | 693 | /** |
| 694 | * rpc_peeraddr2str - return remote peer address in printable format |
| 695 | * @clnt: RPC client structure |
| 696 | * @format: address format |
| 697 | * |
| 698 | */ |
Chuck Lever | b454ae9 | 2008-01-07 18:34:48 -0500 | [diff] [blame] | 699 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
| 700 | enum rpc_display_format_t format) |
Chuck Lever | f425eba | 2006-08-22 20:06:18 -0400 | [diff] [blame] | 701 | { |
| 702 | struct rpc_xprt *xprt = clnt->cl_xprt; |
Chuck Lever | 7559c7a | 2006-12-05 16:35:37 -0500 | [diff] [blame] | 703 | |
| 704 | if (xprt->address_strings[format] != NULL) |
| 705 | return xprt->address_strings[format]; |
| 706 | else |
| 707 | return "unprintable"; |
Chuck Lever | f425eba | 2006-08-22 20:06:18 -0400 | [diff] [blame] | 708 | } |
Chuck Lever | b86acd5 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 709 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
Chuck Lever | f425eba | 2006-08-22 20:06:18 -0400 | [diff] [blame] | 710 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | void |
| 712 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) |
| 713 | { |
| 714 | struct rpc_xprt *xprt = clnt->cl_xprt; |
Chuck Lever | 470056c | 2005-08-25 16:25:56 -0700 | [diff] [blame] | 715 | if (xprt->ops->set_buffer_size) |
| 716 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 718 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
| 720 | /* |
| 721 | * Return size of largest payload RPC client can support, in bytes |
| 722 | * |
| 723 | * For stream transports, this is one RPC record fragment (see RFC |
| 724 | * 1831), as we don't support multi-record requests yet. For datagram |
| 725 | * transports, this is the size of an IP packet minus the IP, UDP, and |
| 726 | * RPC header sizes. |
| 727 | */ |
| 728 | size_t rpc_max_payload(struct rpc_clnt *clnt) |
| 729 | { |
| 730 | return clnt->cl_xprt->max_payload; |
| 731 | } |
Chuck Lever | b86acd5 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 732 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 734 | /** |
| 735 | * rpc_force_rebind - force transport to check that remote port is unchanged |
| 736 | * @clnt: client to rebind |
| 737 | * |
| 738 | */ |
| 739 | void rpc_force_rebind(struct rpc_clnt *clnt) |
| 740 | { |
| 741 | if (clnt->cl_autobind) |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 742 | xprt_clear_bound(clnt->cl_xprt); |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 743 | } |
Chuck Lever | b86acd5 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 744 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 745 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | /* |
Andy Adamson | aae2006 | 2009-04-01 09:22:40 -0400 | [diff] [blame] | 747 | * Restart an (async) RPC call from the call_prepare state. |
| 748 | * Usually called from within the exit handler. |
| 749 | */ |
| 750 | void |
| 751 | rpc_restart_call_prepare(struct rpc_task *task) |
| 752 | { |
| 753 | if (RPC_ASSASSINATED(task)) |
| 754 | return; |
| 755 | task->tk_action = rpc_prepare_task; |
| 756 | } |
| 757 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); |
| 758 | |
| 759 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | * Restart an (async) RPC call. Usually called from within the |
| 761 | * exit handler. |
| 762 | */ |
| 763 | void |
| 764 | rpc_restart_call(struct rpc_task *task) |
| 765 | { |
| 766 | if (RPC_ASSASSINATED(task)) |
| 767 | return; |
| 768 | |
| 769 | task->tk_action = call_start; |
| 770 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 771 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | |
Chuck Lever | 3748f1e | 2008-05-21 17:09:12 -0400 | [diff] [blame] | 773 | #ifdef RPC_DEBUG |
| 774 | static const char *rpc_proc_name(const struct rpc_task *task) |
| 775 | { |
| 776 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
| 777 | |
| 778 | if (proc) { |
| 779 | if (proc->p_name) |
| 780 | return proc->p_name; |
| 781 | else |
| 782 | return "NULL"; |
| 783 | } else |
| 784 | return "no proc"; |
| 785 | } |
| 786 | #endif |
| 787 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | /* |
| 789 | * 0. Initial state |
| 790 | * |
| 791 | * Other FSM states can be visited zero or more times, but |
| 792 | * this state is visited exactly once for each RPC. |
| 793 | */ |
| 794 | static void |
| 795 | call_start(struct rpc_task *task) |
| 796 | { |
| 797 | struct rpc_clnt *clnt = task->tk_client; |
| 798 | |
Chuck Lever | 3748f1e | 2008-05-21 17:09:12 -0400 | [diff] [blame] | 799 | 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] | 800 | clnt->cl_protname, clnt->cl_vers, |
Chuck Lever | 3748f1e | 2008-05-21 17:09:12 -0400 | [diff] [blame] | 801 | rpc_proc_name(task), |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 802 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
| 804 | /* Increment call count */ |
| 805 | task->tk_msg.rpc_proc->p_count++; |
| 806 | clnt->cl_stats->rpccnt++; |
| 807 | task->tk_action = call_reserve; |
| 808 | } |
| 809 | |
| 810 | /* |
| 811 | * 1. Reserve an RPC call slot |
| 812 | */ |
| 813 | static void |
| 814 | call_reserve(struct rpc_task *task) |
| 815 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 816 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | |
| 818 | if (!rpcauth_uptodatecred(task)) { |
| 819 | task->tk_action = call_refresh; |
| 820 | return; |
| 821 | } |
| 822 | |
| 823 | task->tk_status = 0; |
| 824 | task->tk_action = call_reserveresult; |
| 825 | xprt_reserve(task); |
| 826 | } |
| 827 | |
| 828 | /* |
| 829 | * 1b. Grok the result of xprt_reserve() |
| 830 | */ |
| 831 | static void |
| 832 | call_reserveresult(struct rpc_task *task) |
| 833 | { |
| 834 | int status = task->tk_status; |
| 835 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 836 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
| 838 | /* |
| 839 | * After a call to xprt_reserve(), we must have either |
| 840 | * a request slot or else an error status. |
| 841 | */ |
| 842 | task->tk_status = 0; |
| 843 | if (status >= 0) { |
| 844 | if (task->tk_rqstp) { |
| 845 | task->tk_action = call_allocate; |
| 846 | return; |
| 847 | } |
| 848 | |
| 849 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 850 | __func__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | rpc_exit(task, -EIO); |
| 852 | return; |
| 853 | } |
| 854 | |
| 855 | /* |
| 856 | * Even though there was an error, we may have acquired |
| 857 | * a request slot somehow. Make sure not to leak it. |
| 858 | */ |
| 859 | if (task->tk_rqstp) { |
| 860 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 861 | __func__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | xprt_release(task); |
| 863 | } |
| 864 | |
| 865 | switch (status) { |
| 866 | case -EAGAIN: /* woken up; retry */ |
| 867 | task->tk_action = call_reserve; |
| 868 | return; |
| 869 | case -EIO: /* probably a shutdown */ |
| 870 | break; |
| 871 | default: |
| 872 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 873 | __func__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | break; |
| 875 | } |
| 876 | rpc_exit(task, status); |
| 877 | } |
| 878 | |
| 879 | /* |
| 880 | * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 881 | * (Note: buffer memory is freed in xprt_release). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | */ |
| 883 | static void |
| 884 | call_allocate(struct rpc_task *task) |
| 885 | { |
Trond Myklebust | 1be27f3 | 2007-06-27 14:29:04 -0400 | [diff] [blame] | 886 | unsigned int slack = task->tk_msg.rpc_cred->cr_auth->au_cslack; |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 887 | struct rpc_rqst *req = task->tk_rqstp; |
| 888 | struct rpc_xprt *xprt = task->tk_xprt; |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 889 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 891 | dprint_status(task); |
| 892 | |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 893 | task->tk_status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | task->tk_action = call_bind; |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 895 | |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 896 | if (req->rq_buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | return; |
| 898 | |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 899 | if (proc->p_proc != 0) { |
| 900 | BUG_ON(proc->p_arglen == 0); |
| 901 | if (proc->p_decode != NULL) |
| 902 | BUG_ON(proc->p_replen == 0); |
| 903 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 905 | /* |
| 906 | * Calculate the size (in quads) of the RPC call |
| 907 | * and reply headers, and convert both values |
| 908 | * to byte sizes. |
| 909 | */ |
| 910 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; |
| 911 | req->rq_callsize <<= 2; |
| 912 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; |
| 913 | req->rq_rcvsize <<= 2; |
| 914 | |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 915 | req->rq_buffer = xprt->ops->buf_alloc(task, |
| 916 | req->rq_callsize + req->rq_rcvsize); |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 917 | if (req->rq_buffer != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | return; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 919 | |
| 920 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | |
Trond Myklebust | 14b218a | 2005-06-22 17:16:28 +0000 | [diff] [blame] | 922 | if (RPC_IS_ASYNC(task) || !signalled()) { |
Trond Myklebust | b6e9c71 | 2007-10-01 12:06:44 -0400 | [diff] [blame] | 923 | task->tk_action = call_allocate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | rpc_delay(task, HZ>>4); |
| 925 | return; |
| 926 | } |
| 927 | |
| 928 | rpc_exit(task, -ERESTARTSYS); |
| 929 | } |
| 930 | |
Trond Myklebust | 940e331 | 2005-11-09 21:45:24 -0500 | [diff] [blame] | 931 | static inline int |
| 932 | rpc_task_need_encode(struct rpc_task *task) |
| 933 | { |
| 934 | return task->tk_rqstp->rq_snd_buf.len == 0; |
| 935 | } |
| 936 | |
| 937 | static inline void |
| 938 | rpc_task_force_reencode(struct rpc_task *task) |
| 939 | { |
| 940 | task->tk_rqstp->rq_snd_buf.len = 0; |
| 941 | } |
| 942 | |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 943 | static inline void |
| 944 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) |
| 945 | { |
| 946 | buf->head[0].iov_base = start; |
| 947 | buf->head[0].iov_len = len; |
| 948 | buf->tail[0].iov_len = 0; |
| 949 | buf->page_len = 0; |
\"Talpey, Thomas\ | 4f22ccc | 2007-09-10 13:44:58 -0400 | [diff] [blame] | 950 | buf->flags = 0; |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 951 | buf->len = 0; |
| 952 | buf->buflen = len; |
| 953 | } |
| 954 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | /* |
| 956 | * 3. Encode arguments of an RPC call |
| 957 | */ |
| 958 | static void |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 959 | rpc_xdr_encode(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | struct rpc_rqst *req = task->tk_rqstp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | kxdrproc_t encode; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 963 | __be32 *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 965 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 967 | rpc_xdr_buf_init(&req->rq_snd_buf, |
| 968 | req->rq_buffer, |
| 969 | req->rq_callsize); |
| 970 | rpc_xdr_buf_init(&req->rq_rcv_buf, |
| 971 | (char *)req->rq_buffer + req->rq_callsize, |
| 972 | req->rq_rcvsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 974 | p = rpc_encode_header(task); |
| 975 | if (p == NULL) { |
| 976 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | rpc_exit(task, -EIO); |
| 978 | return; |
| 979 | } |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 980 | |
| 981 | encode = task->tk_msg.rpc_proc->p_encode; |
J. Bruce Fields | f368031 | 2005-10-13 16:54:48 -0400 | [diff] [blame] | 982 | if (encode == NULL) |
| 983 | return; |
| 984 | |
| 985 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, |
| 986 | task->tk_msg.rpc_argp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | } |
| 988 | |
| 989 | /* |
| 990 | * 4. Get the server port number if not yet set |
| 991 | */ |
| 992 | static void |
| 993 | call_bind(struct rpc_task *task) |
| 994 | { |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 995 | struct rpc_xprt *xprt = task->tk_xprt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 997 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 999 | task->tk_action = call_connect; |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 1000 | if (!xprt_bound(xprt)) { |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1001 | task->tk_action = call_bind_status; |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 1002 | task->tk_timeout = xprt->bind_timeout; |
Chuck Lever | bbf7c1d | 2006-08-22 20:06:16 -0400 | [diff] [blame] | 1003 | xprt->ops->rpcbind(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | } |
| 1005 | } |
| 1006 | |
| 1007 | /* |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1008 | * 4a. Sort out bind result |
| 1009 | */ |
| 1010 | static void |
| 1011 | call_bind_status(struct rpc_task *task) |
| 1012 | { |
Chuck Lever | 906462a | 2007-09-11 18:00:47 -0400 | [diff] [blame] | 1013 | int status = -EIO; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1014 | |
| 1015 | if (task->tk_status >= 0) { |
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 | task->tk_status = 0; |
| 1018 | task->tk_action = call_connect; |
| 1019 | return; |
| 1020 | } |
| 1021 | |
| 1022 | switch (task->tk_status) { |
Trond Myklebust | 381ba74 | 2008-07-07 12:18:53 -0400 | [diff] [blame] | 1023 | case -ENOMEM: |
| 1024 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); |
| 1025 | rpc_delay(task, HZ >> 2); |
Chuck Lever | 2429cbf | 2007-09-11 18:00:41 -0400 | [diff] [blame] | 1026 | goto retry_timeout; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1027 | case -EACCES: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1028 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
| 1029 | "unavailable\n", task->tk_pid); |
Chuck Lever | b79dc8c | 2007-09-11 18:00:52 -0400 | [diff] [blame] | 1030 | /* fail immediately if this is an RPC ping */ |
| 1031 | if (task->tk_msg.rpc_proc->p_proc == 0) { |
| 1032 | status = -EOPNOTSUPP; |
| 1033 | break; |
| 1034 | } |
Chuck Lever | ea635a5 | 2005-10-06 23:12:58 -0400 | [diff] [blame] | 1035 | rpc_delay(task, 3*HZ); |
Trond Myklebust | da45828 | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 1036 | goto retry_timeout; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1037 | case -ETIMEDOUT: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1038 | dprintk("RPC: %5u rpcbind request timed out\n", |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1039 | task->tk_pid); |
Trond Myklebust | da45828 | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 1040 | goto retry_timeout; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1041 | case -EPFNOSUPPORT: |
Chuck Lever | 906462a | 2007-09-11 18:00:47 -0400 | [diff] [blame] | 1042 | /* server doesn't support any rpcbind version we know of */ |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1043 | dprintk("RPC: %5u remote rpcbind service unavailable\n", |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1044 | task->tk_pid); |
| 1045 | break; |
| 1046 | case -EPROTONOSUPPORT: |
Chuck Lever | 00a6e7b | 2007-03-29 16:48:33 -0400 | [diff] [blame] | 1047 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1048 | task->tk_pid); |
Chuck Lever | 00a6e7b | 2007-03-29 16:48:33 -0400 | [diff] [blame] | 1049 | task->tk_status = 0; |
| 1050 | task->tk_action = call_bind; |
| 1051 | return; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1052 | default: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1053 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1054 | task->tk_pid, -task->tk_status); |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1055 | } |
| 1056 | |
| 1057 | rpc_exit(task, status); |
| 1058 | return; |
| 1059 | |
Trond Myklebust | da45828 | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 1060 | retry_timeout: |
| 1061 | task->tk_action = call_timeout; |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1062 | } |
| 1063 | |
| 1064 | /* |
| 1065 | * 4b. Connect to the RPC server |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | */ |
| 1067 | static void |
| 1068 | call_connect(struct rpc_task *task) |
| 1069 | { |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1070 | struct rpc_xprt *xprt = task->tk_xprt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1072 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1073 | task->tk_pid, xprt, |
| 1074 | (xprt_connected(xprt) ? "is" : "is not")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1076 | task->tk_action = call_transmit; |
| 1077 | if (!xprt_connected(xprt)) { |
| 1078 | task->tk_action = call_connect_status; |
| 1079 | if (task->tk_status < 0) |
| 1080 | return; |
| 1081 | xprt_connect(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | } |
| 1084 | |
| 1085 | /* |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1086 | * 4c. Sort out connect result |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | */ |
| 1088 | static void |
| 1089 | call_connect_status(struct rpc_task *task) |
| 1090 | { |
| 1091 | struct rpc_clnt *clnt = task->tk_client; |
| 1092 | int status = task->tk_status; |
| 1093 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1094 | dprint_status(task); |
Chuck Lever | da35187 | 2005-08-11 16:25:11 -0400 | [diff] [blame] | 1095 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | task->tk_status = 0; |
Trond Myklebust | 2a49199 | 2009-03-11 14:38:00 -0400 | [diff] [blame] | 1097 | if (status >= 0 || status == -EAGAIN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | clnt->cl_stats->netreconn++; |
| 1099 | task->tk_action = call_transmit; |
| 1100 | return; |
| 1101 | } |
| 1102 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | switch (status) { |
Trond Myklebust | da45828 | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 1104 | /* if soft mounted, test if we've timed out */ |
| 1105 | case -ETIMEDOUT: |
| 1106 | task->tk_action = call_timeout; |
Trond Myklebust | 2a49199 | 2009-03-11 14:38:00 -0400 | [diff] [blame] | 1107 | break; |
| 1108 | default: |
| 1109 | rpc_exit(task, -EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | } |
| 1111 | } |
| 1112 | |
| 1113 | /* |
| 1114 | * 5. Transmit the RPC request, and wait for reply |
| 1115 | */ |
| 1116 | static void |
| 1117 | call_transmit(struct rpc_task *task) |
| 1118 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1119 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | |
| 1121 | task->tk_action = call_status; |
| 1122 | if (task->tk_status < 0) |
| 1123 | return; |
| 1124 | task->tk_status = xprt_prepare_transmit(task); |
| 1125 | if (task->tk_status != 0) |
| 1126 | return; |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1127 | task->tk_action = call_transmit_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
Trond Myklebust | 940e331 | 2005-11-09 21:45:24 -0500 | [diff] [blame] | 1129 | if (rpc_task_need_encode(task)) { |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1130 | BUG_ON(task->tk_rqstp->rq_bytes_sent != 0); |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1131 | rpc_xdr_encode(task); |
Trond Myklebust | 5e5ce5b | 2005-10-18 14:20:11 -0700 | [diff] [blame] | 1132 | /* Did the encode result in an error condition? */ |
Trond Myklebust | 8b39f2b | 2008-05-14 19:48:25 -0700 | [diff] [blame] | 1133 | if (task->tk_status != 0) { |
| 1134 | /* Was the error nonfatal? */ |
| 1135 | if (task->tk_status == -EAGAIN) |
| 1136 | rpc_delay(task, HZ >> 4); |
| 1137 | else |
| 1138 | rpc_exit(task, task->tk_status); |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1139 | return; |
Trond Myklebust | 8b39f2b | 2008-05-14 19:48:25 -0700 | [diff] [blame] | 1140 | } |
Trond Myklebust | 5e5ce5b | 2005-10-18 14:20:11 -0700 | [diff] [blame] | 1141 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | xprt_transmit(task); |
| 1143 | if (task->tk_status < 0) |
| 1144 | return; |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1145 | /* |
| 1146 | * On success, ensure that we call xprt_end_transmit() before sleeping |
| 1147 | * in order to allow access to the socket to other RPC requests. |
| 1148 | */ |
| 1149 | call_transmit_status(task); |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 1150 | if (rpc_reply_expected(task)) |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1151 | return; |
| 1152 | task->tk_action = rpc_exit_task; |
Trond Myklebust | fda1393 | 2008-02-22 16:34:12 -0500 | [diff] [blame] | 1153 | rpc_wake_up_queued_task(&task->tk_xprt->pending, task); |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1154 | } |
| 1155 | |
| 1156 | /* |
| 1157 | * 5a. Handle cleanup after a transmission |
| 1158 | */ |
| 1159 | static void |
| 1160 | call_transmit_status(struct rpc_task *task) |
| 1161 | { |
| 1162 | task->tk_action = call_status; |
Trond Myklebust | 15f081c | 2009-03-11 14:37:57 -0400 | [diff] [blame] | 1163 | switch (task->tk_status) { |
| 1164 | case -EAGAIN: |
| 1165 | break; |
| 1166 | default: |
| 1167 | xprt_end_transmit(task); |
| 1168 | /* |
| 1169 | * Special cases: if we've been waiting on the |
| 1170 | * socket's write_space() callback, or if the |
| 1171 | * socket just returned a connection error, |
| 1172 | * then hold onto the transport lock. |
| 1173 | */ |
| 1174 | case -ECONNREFUSED: |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 1175 | case -ECONNRESET: |
Trond Myklebust | 15f081c | 2009-03-11 14:37:57 -0400 | [diff] [blame] | 1176 | case -ENOTCONN: |
| 1177 | case -EHOSTDOWN: |
| 1178 | case -EHOSTUNREACH: |
| 1179 | case -ENETUNREACH: |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 1180 | case -EPIPE: |
Trond Myklebust | 15f081c | 2009-03-11 14:37:57 -0400 | [diff] [blame] | 1181 | rpc_task_force_reencode(task); |
| 1182 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | } |
| 1184 | |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 1185 | #if defined(CONFIG_NFS_V4_1) |
| 1186 | /* |
| 1187 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In |
| 1188 | * addition, disconnect on connectivity errors. |
| 1189 | */ |
| 1190 | static void |
| 1191 | call_bc_transmit(struct rpc_task *task) |
| 1192 | { |
| 1193 | struct rpc_rqst *req = task->tk_rqstp; |
| 1194 | |
| 1195 | BUG_ON(task->tk_status != 0); |
| 1196 | task->tk_status = xprt_prepare_transmit(task); |
| 1197 | if (task->tk_status == -EAGAIN) { |
| 1198 | /* |
| 1199 | * Could not reserve the transport. Try again after the |
| 1200 | * transport is released. |
| 1201 | */ |
| 1202 | task->tk_status = 0; |
| 1203 | task->tk_action = call_bc_transmit; |
| 1204 | return; |
| 1205 | } |
| 1206 | |
| 1207 | task->tk_action = rpc_exit_task; |
| 1208 | if (task->tk_status < 0) { |
| 1209 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
| 1210 | "error: %d\n", task->tk_status); |
| 1211 | return; |
| 1212 | } |
| 1213 | |
| 1214 | xprt_transmit(task); |
| 1215 | xprt_end_transmit(task); |
| 1216 | dprint_status(task); |
| 1217 | switch (task->tk_status) { |
| 1218 | case 0: |
| 1219 | /* Success */ |
| 1220 | break; |
| 1221 | case -EHOSTDOWN: |
| 1222 | case -EHOSTUNREACH: |
| 1223 | case -ENETUNREACH: |
| 1224 | case -ETIMEDOUT: |
| 1225 | /* |
| 1226 | * Problem reaching the server. Disconnect and let the |
| 1227 | * forechannel reestablish the connection. The server will |
| 1228 | * have to retransmit the backchannel request and we'll |
| 1229 | * reprocess it. Since these ops are idempotent, there's no |
| 1230 | * need to cache our reply at this time. |
| 1231 | */ |
| 1232 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
| 1233 | "error: %d\n", task->tk_status); |
| 1234 | xprt_conditional_disconnect(task->tk_xprt, |
| 1235 | req->rq_connect_cookie); |
| 1236 | break; |
| 1237 | default: |
| 1238 | /* |
| 1239 | * We were unable to reply and will have to drop the |
| 1240 | * request. The server should reconnect and retransmit. |
| 1241 | */ |
| 1242 | BUG_ON(task->tk_status == -EAGAIN); |
| 1243 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
| 1244 | "error: %d\n", task->tk_status); |
| 1245 | break; |
| 1246 | } |
| 1247 | rpc_wake_up_queued_task(&req->rq_xprt->pending, task); |
| 1248 | } |
| 1249 | #endif /* CONFIG_NFS_V4_1 */ |
| 1250 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | /* |
| 1252 | * 6. Sort out the RPC call status |
| 1253 | */ |
| 1254 | static void |
| 1255 | call_status(struct rpc_task *task) |
| 1256 | { |
| 1257 | struct rpc_clnt *clnt = task->tk_client; |
| 1258 | struct rpc_rqst *req = task->tk_rqstp; |
| 1259 | int status; |
| 1260 | |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 1261 | if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent) |
| 1262 | task->tk_status = req->rq_reply_bytes_recvd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1264 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | |
| 1266 | status = task->tk_status; |
| 1267 | if (status >= 0) { |
| 1268 | task->tk_action = call_decode; |
| 1269 | return; |
| 1270 | } |
| 1271 | |
| 1272 | task->tk_status = 0; |
| 1273 | switch(status) { |
Trond Myklebust | 7630399 | 2006-08-30 14:32:49 -0400 | [diff] [blame] | 1274 | case -EHOSTDOWN: |
| 1275 | case -EHOSTUNREACH: |
| 1276 | case -ENETUNREACH: |
| 1277 | /* |
| 1278 | * Delay any retries for 3 seconds, then handle as if it |
| 1279 | * were a timeout. |
| 1280 | */ |
| 1281 | rpc_delay(task, 3*HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | case -ETIMEDOUT: |
| 1283 | task->tk_action = call_timeout; |
Trond Myklebust | 241c39b | 2007-04-20 16:12:55 -0400 | [diff] [blame] | 1284 | if (task->tk_client->cl_discrtry) |
Trond Myklebust | 7c1d71c | 2008-04-17 16:52:57 -0400 | [diff] [blame] | 1285 | xprt_conditional_disconnect(task->tk_xprt, |
| 1286 | req->rq_connect_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | break; |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 1288 | case -ECONNRESET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | case -ECONNREFUSED: |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 1290 | rpc_force_rebind(clnt); |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 1291 | rpc_delay(task, 3*HZ); |
| 1292 | case -EPIPE: |
| 1293 | case -ENOTCONN: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | task->tk_action = call_bind; |
| 1295 | break; |
| 1296 | case -EAGAIN: |
| 1297 | task->tk_action = call_transmit; |
| 1298 | break; |
| 1299 | case -EIO: |
| 1300 | /* shutdown or soft timeout */ |
| 1301 | rpc_exit(task, status); |
| 1302 | break; |
| 1303 | default: |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 1304 | if (clnt->cl_chatty) |
| 1305 | printk("%s: RPC call returned error %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | clnt->cl_protname, -status); |
| 1307 | rpc_exit(task, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | } |
| 1309 | } |
| 1310 | |
| 1311 | /* |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 1312 | * 6a. Handle RPC timeout |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | * We do not release the request slot, so we keep using the |
| 1314 | * same XID for all retransmits. |
| 1315 | */ |
| 1316 | static void |
| 1317 | call_timeout(struct rpc_task *task) |
| 1318 | { |
| 1319 | struct rpc_clnt *clnt = task->tk_client; |
| 1320 | |
| 1321 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1322 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | goto retry; |
| 1324 | } |
| 1325 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1326 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
Chuck Lever | ef759a2 | 2006-03-20 13:44:17 -0500 | [diff] [blame] | 1327 | task->tk_timeouts++; |
| 1328 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | if (RPC_IS_SOFT(task)) { |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 1330 | if (clnt->cl_chatty) |
| 1331 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | clnt->cl_protname, clnt->cl_server); |
| 1333 | rpc_exit(task, -EIO); |
| 1334 | return; |
| 1335 | } |
| 1336 | |
Chuck Lever | f518e35 | 2006-01-03 09:55:52 +0100 | [diff] [blame] | 1337 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 1339 | if (clnt->cl_chatty) |
| 1340 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | clnt->cl_protname, clnt->cl_server); |
| 1342 | } |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 1343 | rpc_force_rebind(clnt); |
Trond Myklebust | b48633b | 2008-04-22 16:47:55 -0400 | [diff] [blame] | 1344 | /* |
| 1345 | * Did our request time out due to an RPCSEC_GSS out-of-sequence |
| 1346 | * event? RFC2203 requires the server to drop all such requests. |
| 1347 | */ |
| 1348 | rpcauth_invalcred(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | |
| 1350 | retry: |
| 1351 | clnt->cl_stats->rpcretrans++; |
| 1352 | task->tk_action = call_bind; |
| 1353 | task->tk_status = 0; |
| 1354 | } |
| 1355 | |
| 1356 | /* |
| 1357 | * 7. Decode the RPC reply |
| 1358 | */ |
| 1359 | static void |
| 1360 | call_decode(struct rpc_task *task) |
| 1361 | { |
| 1362 | struct rpc_clnt *clnt = task->tk_client; |
| 1363 | struct rpc_rqst *req = task->tk_rqstp; |
| 1364 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1365 | __be32 *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1367 | dprintk("RPC: %5u call_decode (status %d)\n", |
| 1368 | task->tk_pid, task->tk_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | |
Chuck Lever | f518e35 | 2006-01-03 09:55:52 +0100 | [diff] [blame] | 1370 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 1371 | if (clnt->cl_chatty) |
| 1372 | printk(KERN_NOTICE "%s: server %s OK\n", |
| 1373 | clnt->cl_protname, clnt->cl_server); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
| 1375 | } |
| 1376 | |
Trond Myklebust | 43ac3f2 | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 1377 | /* |
| 1378 | * Ensure that we see all writes made by xprt_complete_rqst() |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 1379 | * before it changed req->rq_reply_bytes_recvd. |
Trond Myklebust | 43ac3f2 | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 1380 | */ |
| 1381 | smp_rmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
| 1383 | |
| 1384 | /* Check that the softirq receive buffer is valid */ |
| 1385 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, |
| 1386 | sizeof(req->rq_rcv_buf)) != 0); |
| 1387 | |
Trond Myklebust | 1e799b6 | 2008-03-21 16:19:41 -0400 | [diff] [blame] | 1388 | if (req->rq_rcv_buf.len < 12) { |
| 1389 | if (!RPC_IS_SOFT(task)) { |
| 1390 | task->tk_action = call_bind; |
| 1391 | clnt->cl_stats->rpcretrans++; |
| 1392 | goto out_retry; |
| 1393 | } |
| 1394 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", |
| 1395 | clnt->cl_protname, task->tk_status); |
| 1396 | task->tk_action = call_timeout; |
| 1397 | goto out_retry; |
| 1398 | } |
| 1399 | |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1400 | p = rpc_verify_header(task); |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1401 | if (IS_ERR(p)) { |
| 1402 | if (p == ERR_PTR(-EAGAIN)) |
| 1403 | goto out_retry; |
| 1404 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | } |
| 1406 | |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1407 | task->tk_action = rpc_exit_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | |
Trond Myklebust | 6d5fcb5 | 2006-10-18 16:01:06 -0400 | [diff] [blame] | 1409 | if (decode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
| 1411 | task->tk_msg.rpc_resp); |
Trond Myklebust | 6d5fcb5 | 2006-10-18 16:01:06 -0400 | [diff] [blame] | 1412 | } |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1413 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
| 1414 | task->tk_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | return; |
| 1416 | out_retry: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | task->tk_status = 0; |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1418 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
Trond Myklebust | 24b74bf | 2008-04-19 13:15:47 -0400 | [diff] [blame] | 1419 | if (task->tk_rqstp == req) { |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 1420 | req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0; |
Trond Myklebust | 24b74bf | 2008-04-19 13:15:47 -0400 | [diff] [blame] | 1421 | if (task->tk_client->cl_discrtry) |
Trond Myklebust | 7c1d71c | 2008-04-17 16:52:57 -0400 | [diff] [blame] | 1422 | xprt_conditional_disconnect(task->tk_xprt, |
| 1423 | req->rq_connect_cookie); |
Trond Myklebust | 24b74bf | 2008-04-19 13:15:47 -0400 | [diff] [blame] | 1424 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | } |
| 1426 | |
| 1427 | /* |
| 1428 | * 8. Refresh the credentials if rejected by the server |
| 1429 | */ |
| 1430 | static void |
| 1431 | call_refresh(struct rpc_task *task) |
| 1432 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1433 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | task->tk_action = call_refreshresult; |
| 1436 | task->tk_status = 0; |
| 1437 | task->tk_client->cl_stats->rpcauthrefresh++; |
| 1438 | rpcauth_refreshcred(task); |
| 1439 | } |
| 1440 | |
| 1441 | /* |
| 1442 | * 8a. Process the results of a credential refresh |
| 1443 | */ |
| 1444 | static void |
| 1445 | call_refreshresult(struct rpc_task *task) |
| 1446 | { |
| 1447 | int status = task->tk_status; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1448 | |
| 1449 | dprint_status(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | |
| 1451 | task->tk_status = 0; |
| 1452 | task->tk_action = call_reserve; |
| 1453 | if (status >= 0 && rpcauth_uptodatecred(task)) |
| 1454 | return; |
| 1455 | if (status == -EACCES) { |
| 1456 | rpc_exit(task, -EACCES); |
| 1457 | return; |
| 1458 | } |
| 1459 | task->tk_action = call_refresh; |
| 1460 | if (status != -ETIMEDOUT) |
| 1461 | rpc_delay(task, 3*HZ); |
| 1462 | return; |
| 1463 | } |
| 1464 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1465 | static __be32 * |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1466 | rpc_encode_header(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | { |
| 1468 | struct rpc_clnt *clnt = task->tk_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | struct rpc_rqst *req = task->tk_rqstp; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1470 | __be32 *p = req->rq_svec[0].iov_base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | |
| 1472 | /* FIXME: check buffer size? */ |
Chuck Lever | 808012f | 2005-08-25 16:25:49 -0700 | [diff] [blame] | 1473 | |
| 1474 | p = xprt_skip_transport_header(task->tk_xprt, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | *p++ = req->rq_xid; /* XID */ |
| 1476 | *p++ = htonl(RPC_CALL); /* CALL */ |
| 1477 | *p++ = htonl(RPC_VERSION); /* RPC version */ |
| 1478 | *p++ = htonl(clnt->cl_prog); /* program number */ |
| 1479 | *p++ = htonl(clnt->cl_vers); /* program version */ |
| 1480 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ |
Trond Myklebust | 334ccfd | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 1481 | p = rpcauth_marshcred(task, p); |
| 1482 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); |
| 1483 | return p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | } |
| 1485 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1486 | static __be32 * |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1487 | rpc_verify_header(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | { |
| 1489 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; |
| 1490 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1491 | __be32 *p = iov->iov_base; |
| 1492 | u32 n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | int error = -EACCES; |
| 1494 | |
David Howells | e889649 | 2006-08-24 15:44:19 -0400 | [diff] [blame] | 1495 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
| 1496 | /* RFC-1014 says that the representation of XDR data must be a |
| 1497 | * multiple of four bytes |
| 1498 | * - if it isn't pointer subtraction in the NFS client may give |
| 1499 | * undefined results |
| 1500 | */ |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1501 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1502 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1503 | task->tk_rqstp->rq_rcv_buf.len); |
David Howells | e889649 | 2006-08-24 15:44:19 -0400 | [diff] [blame] | 1504 | goto out_eio; |
| 1505 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | if ((len -= 3) < 0) |
| 1507 | goto out_overflow; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | |
Ricardo Labiaga | f4a2e41 | 2009-04-01 09:22:54 -0400 | [diff] [blame] | 1509 | p += 1; /* skip XID */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | if ((n = ntohl(*p++)) != RPC_REPLY) { |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1511 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
Ricardo Labiaga | f4a2e41 | 2009-04-01 09:22:54 -0400 | [diff] [blame] | 1512 | task->tk_pid, __func__, n); |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1513 | goto out_garbage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | } |
Ricardo Labiaga | f4a2e41 | 2009-04-01 09:22:54 -0400 | [diff] [blame] | 1515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
| 1517 | if (--len < 0) |
| 1518 | goto out_overflow; |
| 1519 | switch ((n = ntohl(*p++))) { |
| 1520 | case RPC_AUTH_ERROR: |
| 1521 | break; |
| 1522 | case RPC_MISMATCH: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1523 | dprintk("RPC: %5u %s: RPC call version " |
| 1524 | "mismatch!\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1525 | task->tk_pid, __func__); |
Andreas Gruenbacher | cdf4770 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 1526 | error = -EPROTONOSUPPORT; |
| 1527 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | default: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1529 | dprintk("RPC: %5u %s: RPC call rejected, " |
| 1530 | "unknown error: %x\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1531 | task->tk_pid, __func__, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | goto out_eio; |
| 1533 | } |
| 1534 | if (--len < 0) |
| 1535 | goto out_overflow; |
| 1536 | switch ((n = ntohl(*p++))) { |
| 1537 | case RPC_AUTH_REJECTEDCRED: |
| 1538 | case RPC_AUTH_REJECTEDVERF: |
| 1539 | case RPCSEC_GSS_CREDPROBLEM: |
| 1540 | case RPCSEC_GSS_CTXPROBLEM: |
| 1541 | if (!task->tk_cred_retry) |
| 1542 | break; |
| 1543 | task->tk_cred_retry--; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1544 | dprintk("RPC: %5u %s: retry stale creds\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1545 | task->tk_pid, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | rpcauth_invalcred(task); |
Trond Myklebust | 220bcc2 | 2007-10-01 12:06:48 -0400 | [diff] [blame] | 1547 | /* Ensure we obtain a new XID! */ |
| 1548 | xprt_release(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | task->tk_action = call_refresh; |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1550 | goto out_retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | case RPC_AUTH_BADCRED: |
| 1552 | case RPC_AUTH_BADVERF: |
| 1553 | /* possibly garbled cred/verf? */ |
| 1554 | if (!task->tk_garb_retry) |
| 1555 | break; |
| 1556 | task->tk_garb_retry--; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1557 | dprintk("RPC: %5u %s: retry garbled creds\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1558 | task->tk_pid, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | task->tk_action = call_bind; |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1560 | goto out_retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | case RPC_AUTH_TOOWEAK: |
Chuck Lever | b0e1c57 | 2008-05-21 17:09:19 -0400 | [diff] [blame] | 1562 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
Levent Serinol | 1356b8c | 2006-03-20 13:44:11 -0500 | [diff] [blame] | 1563 | "authentication.\n", task->tk_client->cl_server); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | break; |
| 1565 | default: |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1566 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1567 | task->tk_pid, __func__, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | error = -EIO; |
| 1569 | } |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1570 | dprintk("RPC: %5u %s: call rejected %d\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1571 | task->tk_pid, __func__, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | goto out_err; |
| 1573 | } |
| 1574 | if (!(p = rpcauth_checkverf(task, p))) { |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1575 | dprintk("RPC: %5u %s: auth check failed\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1576 | task->tk_pid, __func__); |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1577 | goto out_garbage; /* bad verifier, retry */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | } |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1579 | len = p - (__be32 *)iov->iov_base - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | if (len < 0) |
| 1581 | goto out_overflow; |
| 1582 | switch ((n = ntohl(*p++))) { |
| 1583 | case RPC_SUCCESS: |
| 1584 | return p; |
| 1585 | case RPC_PROG_UNAVAIL: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1586 | dprintk("RPC: %5u %s: program %u is unsupported by server %s\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1587 | task->tk_pid, __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | (unsigned int)task->tk_client->cl_prog, |
| 1589 | task->tk_client->cl_server); |
Andreas Gruenbacher | cdf4770 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 1590 | error = -EPFNOSUPPORT; |
| 1591 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | case RPC_PROG_MISMATCH: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1593 | dprintk("RPC: %5u %s: program %u, version %u unsupported by " |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1594 | "server %s\n", task->tk_pid, __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | (unsigned int)task->tk_client->cl_prog, |
| 1596 | (unsigned int)task->tk_client->cl_vers, |
| 1597 | task->tk_client->cl_server); |
Andreas Gruenbacher | cdf4770 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 1598 | error = -EPROTONOSUPPORT; |
| 1599 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | case RPC_PROC_UNAVAIL: |
Chuck Lever | 3748f1e | 2008-05-21 17:09:12 -0400 | [diff] [blame] | 1601 | dprintk("RPC: %5u %s: proc %s unsupported by program %u, " |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1602 | "version %u on server %s\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1603 | task->tk_pid, __func__, |
Chuck Lever | 3748f1e | 2008-05-21 17:09:12 -0400 | [diff] [blame] | 1604 | rpc_proc_name(task), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | task->tk_client->cl_prog, |
| 1606 | task->tk_client->cl_vers, |
| 1607 | task->tk_client->cl_server); |
Andreas Gruenbacher | cdf4770 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 1608 | error = -EOPNOTSUPP; |
| 1609 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | case RPC_GARBAGE_ARGS: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1611 | dprintk("RPC: %5u %s: server saw garbage\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1612 | task->tk_pid, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | break; /* retry */ |
| 1614 | default: |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1615 | dprintk("RPC: %5u %s: server accept status: %x\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1616 | task->tk_pid, __func__, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1617 | /* Also retry */ |
| 1618 | } |
| 1619 | |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1620 | out_garbage: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1621 | task->tk_client->cl_stats->rpcgarbage++; |
| 1622 | if (task->tk_garb_retry) { |
| 1623 | task->tk_garb_retry--; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1624 | dprintk("RPC: %5u %s: retrying\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1625 | task->tk_pid, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | task->tk_action = call_bind; |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1627 | out_retry: |
| 1628 | return ERR_PTR(-EAGAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1629 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | out_eio: |
| 1631 | error = -EIO; |
| 1632 | out_err: |
| 1633 | rpc_exit(task, error); |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1634 | 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] | 1635 | __func__, error); |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1636 | return ERR_PTR(error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1637 | out_overflow: |
Trond Myklebust | 8a702bb | 2007-06-27 18:30:26 -0400 | [diff] [blame] | 1638 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1639 | __func__); |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 1640 | goto out_garbage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | } |
Trond Myklebust | 5ee0ed7 | 2005-06-22 17:16:20 +0000 | [diff] [blame] | 1642 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1643 | static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj) |
Trond Myklebust | 5ee0ed7 | 2005-06-22 17:16:20 +0000 | [diff] [blame] | 1644 | { |
| 1645 | return 0; |
| 1646 | } |
| 1647 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1648 | static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj) |
Trond Myklebust | 5ee0ed7 | 2005-06-22 17:16:20 +0000 | [diff] [blame] | 1649 | { |
| 1650 | return 0; |
| 1651 | } |
| 1652 | |
| 1653 | static struct rpc_procinfo rpcproc_null = { |
| 1654 | .p_encode = rpcproc_encode_null, |
| 1655 | .p_decode = rpcproc_decode_null, |
| 1656 | }; |
| 1657 | |
Trond Myklebust | 64c91a1 | 2007-06-23 10:17:16 -0400 | [diff] [blame] | 1658 | static int rpc_ping(struct rpc_clnt *clnt, int flags) |
Trond Myklebust | 5ee0ed7 | 2005-06-22 17:16:20 +0000 | [diff] [blame] | 1659 | { |
| 1660 | struct rpc_message msg = { |
| 1661 | .rpc_proc = &rpcproc_null, |
| 1662 | }; |
| 1663 | int err; |
| 1664 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); |
| 1665 | err = rpc_call_sync(clnt, &msg, flags); |
| 1666 | put_rpccred(msg.rpc_cred); |
| 1667 | return err; |
| 1668 | } |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1669 | |
Trond Myklebust | 5e1550d | 2007-06-23 10:17:16 -0400 | [diff] [blame] | 1670 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
| 1671 | { |
| 1672 | struct rpc_message msg = { |
| 1673 | .rpc_proc = &rpcproc_null, |
| 1674 | .rpc_cred = cred, |
| 1675 | }; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1676 | struct rpc_task_setup task_setup_data = { |
| 1677 | .rpc_client = clnt, |
| 1678 | .rpc_message = &msg, |
| 1679 | .callback_ops = &rpc_default_ops, |
| 1680 | .flags = flags, |
| 1681 | }; |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1682 | return rpc_run_task(&task_setup_data); |
Trond Myklebust | 5e1550d | 2007-06-23 10:17:16 -0400 | [diff] [blame] | 1683 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1684 | EXPORT_SYMBOL_GPL(rpc_call_null); |
Trond Myklebust | 5e1550d | 2007-06-23 10:17:16 -0400 | [diff] [blame] | 1685 | |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1686 | #ifdef RPC_DEBUG |
Chuck Lever | 68a23ee | 2008-05-21 17:09:26 -0400 | [diff] [blame] | 1687 | static void rpc_show_header(void) |
| 1688 | { |
Chuck Lever | cb3997b | 2008-05-21 17:09:41 -0400 | [diff] [blame] | 1689 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
| 1690 | "-timeout ---ops--\n"); |
Chuck Lever | 68a23ee | 2008-05-21 17:09:26 -0400 | [diff] [blame] | 1691 | } |
| 1692 | |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1693 | static void rpc_show_task(const struct rpc_clnt *clnt, |
| 1694 | const struct rpc_task *task) |
| 1695 | { |
| 1696 | const char *rpc_waitq = "none"; |
Chuck Lever | cb3997b | 2008-05-21 17:09:41 -0400 | [diff] [blame] | 1697 | char *p, action[KSYM_SYMBOL_LEN]; |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1698 | |
| 1699 | if (RPC_IS_QUEUED(task)) |
| 1700 | rpc_waitq = rpc_qname(task->tk_waitqueue); |
| 1701 | |
Chuck Lever | cb3997b | 2008-05-21 17:09:41 -0400 | [diff] [blame] | 1702 | /* map tk_action pointer to a function name; then trim off |
| 1703 | * the "+0x0 [sunrpc]" */ |
| 1704 | sprint_symbol(action, (unsigned long)task->tk_action); |
| 1705 | p = strchr(action, '+'); |
| 1706 | if (p) |
| 1707 | *p = '\0'; |
| 1708 | |
| 1709 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%s q:%s\n", |
| 1710 | task->tk_pid, task->tk_flags, task->tk_status, |
| 1711 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, |
| 1712 | clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task), |
| 1713 | action, rpc_waitq); |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1714 | } |
| 1715 | |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1716 | void rpc_show_tasks(void) |
| 1717 | { |
| 1718 | struct rpc_clnt *clnt; |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1719 | struct rpc_task *task; |
Chuck Lever | 68a23ee | 2008-05-21 17:09:26 -0400 | [diff] [blame] | 1720 | int header = 0; |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1721 | |
| 1722 | spin_lock(&rpc_client_lock); |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1723 | list_for_each_entry(clnt, &all_clients, cl_clients) { |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1724 | spin_lock(&clnt->cl_lock); |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1725 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
Chuck Lever | 68a23ee | 2008-05-21 17:09:26 -0400 | [diff] [blame] | 1726 | if (!header) { |
| 1727 | rpc_show_header(); |
| 1728 | header++; |
| 1729 | } |
Chuck Lever | 38e886e | 2008-05-21 17:09:33 -0400 | [diff] [blame] | 1730 | rpc_show_task(clnt, task); |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1731 | } |
| 1732 | spin_unlock(&clnt->cl_lock); |
| 1733 | } |
Trond Myklebust | 188fef1 | 2007-06-16 14:18:40 -0400 | [diff] [blame] | 1734 | spin_unlock(&rpc_client_lock); |
| 1735 | } |
| 1736 | #endif |