include/libnfs-raw.h

   1 /*
   2    Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as published by
   6    the Free Software Foundation; either version 2.1 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program; if not, see <http://www.gnu.org/licenses/>.
  16 */
  17 /*
  18  * This is the lowlevel interface to access NFS resources.
  19  * Through this interface you have access to the full gamut of nfs and nfs related
  20  * protocol as well as the XDR encoded/decoded structures.
  21  */
  22 #include <stdint.h>
  23
  24 struct rpc_data {
  25        int size;
  26        unsigned char *data;
  27 };
  28
  29 struct rpc_context;
  30 struct rpc_context *rpc_init_context(void);
  31 void rpc_destroy_context(struct rpc_context *rpc);
  32
  33 struct AUTH;
  34 void rpc_set_auth(struct rpc_context *rpc, struct AUTH *auth);
  35
  36 int rpc_get_fd(struct rpc_context *rpc);
  37 int rpc_which_events(struct rpc_context *rpc);
  38 int rpc_service(struct rpc_context *rpc, int revents);
  39 char *rpc_get_error(struct rpc_context *rpc);
  40
  41
  42 #define RPC_STATUS_SUCCESS              0
  43 #define RPC_STATUS_ERROR                1
  44 #define RPC_STATUS_CANCEL               2
  45
  46 typedef void (*rpc_cb)(struct rpc_context *rpc, int status, void *data, void *private_data);
  47
  48 /*
  49  * Async connection to the tcp port at server:port.
  50  * Function returns
  51  *  0 : The connection was initiated. Once the connection establish finishes, the callback will be invoked.
  52  * <0 : An error occured when trying to set up the connection. The callback will not be invoked.
  53  *
  54  * When the callback is invoked, status indicates the result:
  55  * RPC_STATUS_SUCCESS : The tcp connection was successfully established.
  56  *                      data is NULL.
  57  * RPC_STATUS_ERROR   : The connection failed to establish.
  58  *                      data is the erro string.
  59  * RPC_STATUS_CANCEL  : The connection attempt was aborted before it could complete.
  60  *                    : data is NULL.
  61  */
  62 int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data);
  63 /*
  64  * When disconnecting a connection in flight. All commands in flight will be called with the callback
  65  * and status RPC_STATUS_ERROR. Data will be the error string for the disconnection.
  66  */
  67 int rpc_disconnect(struct rpc_context *rpc, char *error);
  68
  69 void rpc_set_error(struct rpc_context *rpc, char *error_string, ...);
  70
  71
  72 /*
  73  * PORTMAP FUNCTIONS
  74  */
  75
  76 /*
  77  * Call PORTMAPPER/NULL
  78  * Function returns
  79  *  0 : The connection was initiated. Once the connection establish finishes, the callback will be invoked.
  80  * <0 : An error occured when trying to set up the connection. The callback will not be invoked.
  81  *
  82  * When the callback is invoked, status indicates the result:
  83  * RPC_STATUS_SUCCESS : We got a successful response from the portmapper daemon.
  84  *                      data is NULL.
  85  * RPC_STATUS_ERROR   : An error occured when trying to contact the portmapper.
  86  *                      data is the error string.
  87  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
  88  *                     data is NULL.
  89  */
  90 int rpc_pmap_null_async(struct rpc_context *rpc, rpc_cb cb, void *private_data);
  91
  92
  93 /*
  94  * Call PORTMAPPER/GETPORT.
  95  * Function returns
  96  *  0 : The connection was initiated. Once the connection establish finishes, the callback will be invoked.
  97  * <0 : An error occured when trying to set up the connection. The callback will not be invoked.
  98  *
  99  * When the callback is invoked, status indicates the result:
 100  * RPC_STATUS_SUCCESS : We got a successful response from the portmapper daemon.
 101  *                      data is a (uint32_t *), containing the port returned.
 102  * RPC_STATUS_ERROR   : An error occured when trying to contact the portmapper.
 103  *                      data is the error string.
 104  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 105  *                     data is NULL.
 106  */
 107 int rpc_pmap_getport_async(struct rpc_context *rpc, int program, int version, rpc_cb cb, void *private_data);
 108
 109
 110
 111 /*
 112  * MOUNT FUNCTIONS
 113  */
 114 char *mountstat3_to_str(int stat);
 115 int mountstat3_to_errno(int error);
 116
 117 /*
 118  * Call MOUNT/NULL
 119  * Function returns
 120  *  0 : The call was initiated. The callback will be invoked when the call completes.
 121  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 122  *
 123  * When the callback is invoked, status indicates the result:
 124  * RPC_STATUS_SUCCESS : We got a successful response from the mount daemon.
 125  *                      data is NULL.
 126  * RPC_STATUS_ERROR   : An error occured when trying to contact the mount daemon.
 127  *                      data is the error string.
 128  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 129  *                     data is NULL.
 130  */
 131 int rpc_mount_null_async(struct rpc_context *rpc, rpc_cb cb, void *private_data);
 132
 133 /*
 134  * Call MOUNT/MNT
 135  * Function returns
 136  *  0 : The call was initiated. The callback will be invoked when the call completes.
 137  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 138  *
 139  * When the callback is invoked, status indicates the result:
 140  * RPC_STATUS_SUCCESS : We got a successful response from the mount daemon.
 141  *                      data is union mountres3.
 142  * RPC_STATUS_ERROR   : An error occured when trying to contact the mount daemon.
 143  *                      data is the error string.
 144  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 145  *                     data is NULL.
 146  */
 147 int rpc_mount_mnt_async(struct rpc_context *rpc, rpc_cb cb, char *export, void *private_data);
 148
 149 /*
 150  * Call MOUNT/DUMP
 151  * Function returns
 152  *  0 : The call was initiated. The callback will be invoked when the call completes.
 153  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 154  *
 155  * When the callback is invoked, status indicates the result:
 156  * RPC_STATUS_SUCCESS : We got a successful response from the mount daemon.
 157  *                      data is a mountlist.
 158  * RPC_STATUS_ERROR   : An error occured when trying to contact the mount daemon.
 159  *                      data is the error string.
 160  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 161  *                     data is NULL.
 162  */
 163 int rpc_mount_dump_async(struct rpc_context *rpc, rpc_cb cb, void *private_data);
 164
 165 /*
 166  * Call MOUNT/UMNT
 167  * Function returns
 168  *  0 : The call was initiated. The callback will be invoked when the call completes.
 169  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 170  *
 171  * When the callback is invoked, status indicates the result:
 172  * RPC_STATUS_SUCCESS : We got a successful response from the mount daemon.
 173  *                      data NULL.
 174  * RPC_STATUS_ERROR   : An error occured when trying to contact the mount daemon.
 175  *                      data is the error string.
 176  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 177  *                     data is NULL.
 178  */
 179 int rpc_mount_umnt_async(struct rpc_context *rpc, rpc_cb cb, char *export, void *private_data);
 180
 181 /*
 182  * Call MOUNT/UMNTALL
 183  * Function returns
 184  *  0 : The call was initiated. The callback will be invoked when the call completes.
 185  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 186  *
 187  * When the callback is invoked, status indicates the result:
 188  * RPC_STATUS_SUCCESS : We got a successful response from the mount daemon.
 189  *                      data NULL.
 190  * RPC_STATUS_ERROR   : An error occured when trying to contact the mount daemon.
 191  *                      data is the error string.
 192  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 193  *                     data is NULL.
 194  */
 195 int rpc_mount_umntall_async(struct rpc_context *rpc, rpc_cb cb, void *private_data);
 196
 197 /*
 198  * Call MOUNT/EXPORT
 199  * Function returns
 200  *  0 : The call was initiated. The callback will be invoked when the call completes.
 201  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 202  *
 203  * When the callback is invoked, status indicates the result:
 204  * RPC_STATUS_SUCCESS : We got a successful response from the mount daemon.
 205  *                      data is an exports.
 206  * RPC_STATUS_ERROR   : An error occured when trying to contact the mount daemon.
 207  *                      data is the error string.
 208  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 209  *                     data is NULL.
 210  */
 211 int rpc_mount_export_async(struct rpc_context *rpc, rpc_cb cb, void *private_data);
 212
 213
 214
 215
 216 /*
 217  * NFS FUNCTIONS
 218  */
 219 struct nfs_fh3;
 220 char *nfsstat3_to_str(int error);
 221 int nfsstat3_to_errno(int error);
 222
 223 /*
 224  * Call NFS/NULL
 225  * Function returns
 226  *  0 : The call was initiated. The callback will be invoked when the call completes.
 227  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 228  *
 229  * When the callback is invoked, status indicates the result:
 230  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 231  *                      data is NULL.
 232  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 233  *                      data is the error string.
 234  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 235  *                     data is NULL.
 236  */
 237 int rpc_nfs_null_async(struct rpc_context *rpc, rpc_cb cb, void *private_data);
 238
 239 /*
 240  * Call NFS/GETATTR
 241  * Function returns
 242  *  0 : The call was initiated. The callback will be invoked when the call completes.
 243  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 244  *
 245  * When the callback is invoked, status indicates the result:
 246  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 247  *                      data is GETATTR3res
 248  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 249  *                      data is the error string.
 250  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 251  *                     data is NULL.
 252  */
 253 int rpc_nfs_getattr_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *fh, void *private_data);
 254
 255 /*
 256  * Call NFS/LOOKUP
 257  * Function returns
 258  *  0 : The call was initiated. The callback will be invoked when the call completes.
 259  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 260  *
 261  * When the callback is invoked, status indicates the result:
 262  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 263  *                      data is LOOKUP3res
 264  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 265  *                      data is the error string.
 266  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 267  *                     data is NULL.
 268  */
 269 int rpc_nfs_lookup_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *fh, char *name, void *private_data);
 270
 271 /*
 272  * Call NFS/ACCESS
 273  * Function returns
 274  *  0 : The call was initiated. The callback will be invoked when the call completes.
 275  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 276  *
 277  * When the callback is invoked, status indicates the result:
 278  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 279  *                      data is ACCESS3res
 280  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 281  *                      data is the error string.
 282  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 283  *                     data is NULL.
 284  */
 285 int rpc_nfs_access_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *fh, int access, void *private_data);
 286
 287 /*
 288  * Call NFS/READ
 289  * Function returns
 290  *  0 : The call was initiated. The callback will be invoked when the call completes.
 291  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 292  *
 293  * When the callback is invoked, status indicates the result:
 294  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 295  *                      data is ACCESS3res
 296  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 297  *                      data is the error string.
 298  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 299  *                     data is NULL.
 300  */
 301 int rpc_nfs_read_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *fh, off_t offset, size_t count, void *private_data);
 302
 303 /*
 304  * Call NFS/WRITE
 305  * Function returns
 306  *  0 : The call was initiated. The callback will be invoked when the call completes.
 307  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 308  *
 309  * When the callback is invoked, status indicates the result:
 310  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 311  *                      data is WRITE3res *
 312  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 313  *                      data is the error string.
 314  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 315  *                     data is NULL.
 316  */
 317 int rpc_nfs_write_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *fh, char *buf, off_t offset, size_t count, int stable_how, void *private_data);
 318
 319 /*
 320  * Call NFS/COMMIT
 321  * Function returns
 322  *  0 : The call was initiated. The callback will be invoked when the call completes.
 323  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 324  *
 325  * When the callback is invoked, status indicates the result:
 326  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 327  *                      data is COMMIT3res *
 328  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 329  *                      data is the error string.
 330  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 331  *                     data is NULL.
 332  */
 333 int rpc_nfs_commit_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *fh, void *private_data);
 334
 335
 336 /*
 337  * Call NFS/SETATTR
 338  * Function returns
 339  *  0 : The call was initiated. The callback will be invoked when the call completes.
 340  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 341  *
 342  * When the callback is invoked, status indicates the result:
 343  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 344  *                      data is SETATTR3res *
 345  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 346  *                      data is the error string.
 347  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 348  *                     data is NULL.
 349  */
 350 struct SETATTR3args;
 351 int rpc_nfs_setattr_async(struct rpc_context *rpc, rpc_cb cb, struct SETATTR3args *args, void *private_data);
 352
 353
 354
 355 /*
 356  * Call NFS/MKDIR
 357  * Function returns
 358  *  0 : The call was initiated. The callback will be invoked when the call completes.
 359  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 360  *
 361  * When the callback is invoked, status indicates the result:
 362  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 363  *                      data is MKDIR3res *
 364  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 365  *                      data is the error string.
 366  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 367  *                     data is NULL.
 368  */
 369 int rpc_nfs_mkdir_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *fh, char *dir, void *private_data);
 370
 371
 372
 373
 374
 375 /*
 376  * Call NFS/RMDIR
 377  * Function returns
 378  *  0 : The call was initiated. The callback will be invoked when the call completes.
 379  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 380  *
 381  * When the callback is invoked, status indicates the result:
 382  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 383  *                      data is RMDIR3res *
 384  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 385  *                      data is the error string.
 386  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 387  *                     data is NULL.
 388  */
 389 int rpc_nfs_rmdir_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *fh, char *dir, void *private_data);
 390
 391
 392
 393
 394 /*
 395  * Call NFS/CREATE
 396  * Function returns
 397  *  0 : The call was initiated. The callback will be invoked when the call completes.
 398  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 399  *
 400  * When the callback is invoked, status indicates the result:
 401  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 402  *                      data is CREATE3res *
 403  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 404  *                      data is the error string.
 405  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 406  *                     data is NULL.
 407  */
 408 int rpc_nfs_create_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *fh, char *name, int mode, void *private_data);
 409
 410
 411
 412
 413 /*
 414  * Call NFS/REMOVE
 415  * Function returns
 416  *  0 : The call was initiated. The callback will be invoked when the call completes.
 417  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 418  *
 419  * When the callback is invoked, status indicates the result:
 420  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 421  *                      data is REMOVE3res *
 422  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 423  *                      data is the error string.
 424  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 425  *                     data is NULL.
 426  */
 427 int rpc_nfs_remove_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *fh, char *name, void *private_data);
 428
 429
 430
 431 /*
 432  * Call NFS/REMOVE
 433  * Function returns
 434  *  0 : The call was initiated. The callback will be invoked when the call completes.
 435  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 436  *
 437  * When the callback is invoked, status indicates the result:
 438  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 439  *                      data is READDIR3res *
 440  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 441  *                      data is the error string.
 442  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 443  *                     data is NULL.
 444  */
 445 int rpc_nfs_readdir_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *fh, uint64_t cookie, char *cookieverf, int count, void *private_data);
 446
 447 /*
 448  * Call NFS/FSSTAT
 449  * Function returns
 450  *  0 : The call was initiated. The callback will be invoked when the call completes.
 451  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 452  *
 453  * When the callback is invoked, status indicates the result:
 454  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 455  *                      data is FSSTAT3res
 456  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 457  *                      data is the error string.
 458  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 459  *                     data is NULL.
 460  */
 461 int rpc_nfs_fsstat_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *fh, void *private_data);
 462
 463
 464
 465
 466 /*
 467  * Call NFS/READLINK
 468  * Function returns
 469  *  0 : The call was initiated. The callback will be invoked when the call completes.
 470  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 471  *
 472  * When the callback is invoked, status indicates the result:
 473  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 474  *                      data is READLINK3res *
 475  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 476  *                      data is the error string.
 477  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 478  *                     data is NULL.
 479  */
 480 int rpc_nfs_readlink_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *fh, void *private_data);
 481
 482
 483
 484 /*
 485  * Call NFS/SYMLINK
 486  * Function returns
 487  *  0 : The call was initiated. The callback will be invoked when the call completes.
 488  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 489  *
 490  * When the callback is invoked, status indicates the result:
 491  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 492  *                      data is SYMLINK3res *
 493  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 494  *                      data is the error string.
 495  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 496  *                     data is NULL.
 497  */
 498 int rpc_nfs_symlink_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *fh, char *newname, char *oldpath, void *private_data);
 499
 500
 501 /*
 502  * Call NFS/RENAME
 503  * Function returns
 504  *  0 : The call was initiated. The callback will be invoked when the call completes.
 505  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 506  *
 507  * When the callback is invoked, status indicates the result:
 508  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 509  *                      data is RENAME3res *
 510  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 511  *                      data is the error string.
 512  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 513  *                     data is NULL.
 514  */
 515 int rpc_nfs_rename_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *olddir, char *oldname, struct nfs_fh3 *newdir, char *newname, void *private_data);
 516
 517
 518
 519 /*
 520  * Call NFS/LINK
 521  * Function returns
 522  *  0 : The call was initiated. The callback will be invoked when the call completes.
 523  * <0 : An error occured when trying to set up the call. The callback will not be invoked.
 524  *
 525  * When the callback is invoked, status indicates the result:
 526  * RPC_STATUS_SUCCESS : We got a successful response from the nfs daemon.
 527  *                      data is LINK3res *
 528  * RPC_STATUS_ERROR   : An error occured when trying to contact the nfs daemon.
 529  *                      data is the error string.
 530  * RPC_STATUS_CANCEL : The connection attempt was aborted before it could complete.
 531  *                     data is NULL.
 532  */
 533 int rpc_nfs_link_async(struct rpc_context *rpc, rpc_cb cb, struct nfs_fh3 *file, struct nfs_fh3 *newdir, char *newname, void *private_data);
 534
 535
 536