1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/nfs/proc.c 4 * 5 * Copyright (C) 1992, 1993, 1994 Rick Sladkey 6 * 7 * OS-independent nfs remote procedure call functions 8 * 9 * Tuned by Alan Cox <A.Cox@swansea.ac.uk> for >3K buffers 10 * so at last we can have decent(ish) throughput off a 11 * Sun server. 12 * 13 * Coding optimized and cleaned up by Florian La Roche. 14 * Note: Error returns are optimized for NFS_OK, which isn't translated via 15 * nfs_stat_to_errno(), but happens to be already the right return code. 16 * 17 * Also, the code currently doesn't check the size of the packet, when 18 * it decodes the packet. 19 * 20 * Feel free to fix it and mail me the diffs if it worries you. 21 * 22 * Completely rewritten to support the new RPC call interface; 23 * rewrote and moved the entire XDR stuff to xdr.c 24 * --Olaf Kirch June 1996 25 * 26 * The code below initializes all auto variables explicitly, otherwise 27 * it will fail to work as a module (gcc generates a memset call for an 28 * incomplete struct). 29 */ 30 31 #include <linux/types.h> 32 #include <linux/param.h> 33 #include <linux/time.h> 34 #include <linux/mm.h> 35 #include <linux/errno.h> 36 #include <linux/string.h> 37 #include <linux/in.h> 38 #include <linux/pagemap.h> 39 #include <linux/sunrpc/clnt.h> 40 #include <linux/nfs.h> 41 #include <linux/nfs2.h> 42 #include <linux/nfs_fs.h> 43 #include <linux/nfs_page.h> 44 #include <linux/lockd/bind.h> 45 #include <linux/freezer.h> 46 #include "internal.h" 47 48 #define NFSDBG_FACILITY NFSDBG_PROC 49 50 /* 51 * Bare-bones access to getattr: this is for nfs_read_super. 52 */ 53 static int 54 nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle, 55 struct nfs_fsinfo *info) 56 { 57 struct nfs_fattr *fattr = info->fattr; 58 struct nfs2_fsstat fsinfo; 59 struct rpc_message msg = { 60 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR], 61 .rpc_argp = fhandle, 62 .rpc_resp = fattr, 63 }; 64 int status; 65 66 dprintk("%s: call getattr\n", __func__); 67 nfs_fattr_init(fattr); 68 status = rpc_call_sync(server->client, &msg, 0); 69 /* Retry with default authentication if different */ 70 if (status && server->nfs_client->cl_rpcclient != server->client) 71 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0); 72 dprintk("%s: reply getattr: %d\n", __func__, status); 73 if (status) 74 return status; 75 dprintk("%s: call statfs\n", __func__); 76 msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS]; 77 msg.rpc_resp = &fsinfo; 78 status = rpc_call_sync(server->client, &msg, 0); 79 /* Retry with default authentication if different */ 80 if (status && server->nfs_client->cl_rpcclient != server->client) 81 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0); 82 dprintk("%s: reply statfs: %d\n", __func__, status); 83 if (status) 84 return status; 85 info->rtmax = NFS_MAXDATA; 86 info->rtpref = fsinfo.tsize; 87 info->rtmult = fsinfo.bsize; 88 info->wtmax = NFS_MAXDATA; 89 info->wtpref = fsinfo.tsize; 90 info->wtmult = fsinfo.bsize; 91 info->dtpref = fsinfo.tsize; 92 info->maxfilesize = 0x7FFFFFFF; 93 info->lease_time = 0; 94 info->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; 95 return 0; 96 } 97 98 /* 99 * One function for each procedure in the NFS protocol. 100 */ 101 static int 102 nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 103 struct nfs_fattr *fattr, struct inode *inode) 104 { 105 struct rpc_message msg = { 106 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR], 107 .rpc_argp = fhandle, 108 .rpc_resp = fattr, 109 }; 110 int status; 111 unsigned short task_flags = 0; 112 113 /* Is this is an attribute revalidation, subject to softreval? */ 114 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 115 task_flags |= RPC_TASK_TIMEOUT; 116 117 dprintk("NFS call getattr\n"); 118 nfs_fattr_init(fattr); 119 status = rpc_call_sync(server->client, &msg, task_flags); 120 dprintk("NFS reply getattr: %d\n", status); 121 return status; 122 } 123 124 static int 125 nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 126 struct iattr *sattr) 127 { 128 struct inode *inode = d_inode(dentry); 129 struct nfs_sattrargs arg = { 130 .fh = NFS_FH(inode), 131 .sattr = sattr 132 }; 133 struct rpc_message msg = { 134 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR], 135 .rpc_argp = &arg, 136 .rpc_resp = fattr, 137 }; 138 int status; 139 140 /* Mask out the non-modebit related stuff from attr->ia_mode */ 141 sattr->ia_mode &= S_IALLUGO; 142 143 dprintk("NFS call setattr\n"); 144 if (sattr->ia_valid & ATTR_FILE) 145 msg.rpc_cred = nfs_file_cred(sattr->ia_file); 146 nfs_fattr_init(fattr); 147 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 148 if (status == 0) 149 nfs_setattr_update_inode(inode, sattr, fattr); 150 dprintk("NFS reply setattr: %d\n", status); 151 return status; 152 } 153 154 static int 155 nfs_proc_lookup(struct inode *dir, struct dentry *dentry, 156 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 157 { 158 struct nfs_diropargs arg = { 159 .fh = NFS_FH(dir), 160 .name = dentry->d_name.name, 161 .len = dentry->d_name.len 162 }; 163 struct nfs_diropok res = { 164 .fh = fhandle, 165 .fattr = fattr 166 }; 167 struct rpc_message msg = { 168 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP], 169 .rpc_argp = &arg, 170 .rpc_resp = &res, 171 }; 172 int status; 173 unsigned short task_flags = 0; 174 175 /* Is this is an attribute revalidation, subject to softreval? */ 176 if (nfs_lookup_is_soft_revalidate(dentry)) 177 task_flags |= RPC_TASK_TIMEOUT; 178 179 dprintk("NFS call lookup %pd2\n", dentry); 180 nfs_fattr_init(fattr); 181 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags); 182 dprintk("NFS reply lookup: %d\n", status); 183 return status; 184 } 185 186 static int nfs_proc_readlink(struct inode *inode, struct page *page, 187 unsigned int pgbase, unsigned int pglen) 188 { 189 struct nfs_readlinkargs args = { 190 .fh = NFS_FH(inode), 191 .pgbase = pgbase, 192 .pglen = pglen, 193 .pages = &page 194 }; 195 struct rpc_message msg = { 196 .rpc_proc = &nfs_procedures[NFSPROC_READLINK], 197 .rpc_argp = &args, 198 }; 199 int status; 200 201 dprintk("NFS call readlink\n"); 202 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 203 dprintk("NFS reply readlink: %d\n", status); 204 return status; 205 } 206 207 struct nfs_createdata { 208 struct nfs_createargs arg; 209 struct nfs_diropok res; 210 struct nfs_fh fhandle; 211 struct nfs_fattr fattr; 212 }; 213 214 static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir, 215 struct dentry *dentry, struct iattr *sattr) 216 { 217 struct nfs_createdata *data; 218 219 data = kmalloc(sizeof(*data), GFP_KERNEL); 220 221 if (data != NULL) { 222 data->arg.fh = NFS_FH(dir); 223 data->arg.name = dentry->d_name.name; 224 data->arg.len = dentry->d_name.len; 225 data->arg.sattr = sattr; 226 nfs_fattr_init(&data->fattr); 227 data->fhandle.size = 0; 228 data->res.fh = &data->fhandle; 229 data->res.fattr = &data->fattr; 230 } 231 return data; 232 }; 233 234 static void nfs_free_createdata(const struct nfs_createdata *data) 235 { 236 kfree(data); 237 } 238 239 static int 240 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 241 int flags) 242 { 243 struct nfs_createdata *data; 244 struct rpc_message msg = { 245 .rpc_proc = &nfs_procedures[NFSPROC_CREATE], 246 }; 247 int status = -ENOMEM; 248 249 dprintk("NFS call create %pd\n", dentry); 250 data = nfs_alloc_createdata(dir, dentry, sattr); 251 if (data == NULL) 252 goto out; 253 msg.rpc_argp = &data->arg; 254 msg.rpc_resp = &data->res; 255 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 256 nfs_mark_for_revalidate(dir); 257 if (status == 0) 258 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 259 nfs_free_createdata(data); 260 out: 261 dprintk("NFS reply create: %d\n", status); 262 return status; 263 } 264 265 /* 266 * In NFSv2, mknod is grafted onto the create call. 267 */ 268 static int 269 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 270 dev_t rdev) 271 { 272 struct nfs_createdata *data; 273 struct rpc_message msg = { 274 .rpc_proc = &nfs_procedures[NFSPROC_CREATE], 275 }; 276 umode_t mode; 277 int status = -ENOMEM; 278 279 dprintk("NFS call mknod %pd\n", dentry); 280 281 mode = sattr->ia_mode; 282 if (S_ISFIFO(mode)) { 283 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR; 284 sattr->ia_valid &= ~ATTR_SIZE; 285 } else if (S_ISCHR(mode) || S_ISBLK(mode)) { 286 sattr->ia_valid |= ATTR_SIZE; 287 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */ 288 } 289 290 data = nfs_alloc_createdata(dir, dentry, sattr); 291 if (data == NULL) 292 goto out; 293 msg.rpc_argp = &data->arg; 294 msg.rpc_resp = &data->res; 295 296 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 297 nfs_mark_for_revalidate(dir); 298 299 if (status == -EINVAL && S_ISFIFO(mode)) { 300 sattr->ia_mode = mode; 301 nfs_fattr_init(data->res.fattr); 302 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 303 } 304 if (status == 0) 305 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 306 nfs_free_createdata(data); 307 out: 308 dprintk("NFS reply mknod: %d\n", status); 309 return status; 310 } 311 312 static int 313 nfs_proc_remove(struct inode *dir, struct dentry *dentry) 314 { 315 struct nfs_removeargs arg = { 316 .fh = NFS_FH(dir), 317 .name = dentry->d_name, 318 }; 319 struct rpc_message msg = { 320 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE], 321 .rpc_argp = &arg, 322 }; 323 int status; 324 325 dprintk("NFS call remove %pd2\n",dentry); 326 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 327 nfs_mark_for_revalidate(dir); 328 329 dprintk("NFS reply remove: %d\n", status); 330 return status; 331 } 332 333 static void 334 nfs_proc_unlink_setup(struct rpc_message *msg, 335 struct dentry *dentry, 336 struct inode *inode) 337 { 338 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE]; 339 } 340 341 static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 342 { 343 rpc_call_start(task); 344 } 345 346 static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir) 347 { 348 nfs_mark_for_revalidate(dir); 349 return 1; 350 } 351 352 static void 353 nfs_proc_rename_setup(struct rpc_message *msg, 354 struct dentry *old_dentry, 355 struct dentry *new_dentry) 356 { 357 msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME]; 358 } 359 360 static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 361 { 362 rpc_call_start(task); 363 } 364 365 static int 366 nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 367 struct inode *new_dir) 368 { 369 nfs_mark_for_revalidate(old_dir); 370 nfs_mark_for_revalidate(new_dir); 371 return 1; 372 } 373 374 static int 375 nfs_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 376 { 377 struct nfs_linkargs arg = { 378 .fromfh = NFS_FH(inode), 379 .tofh = NFS_FH(dir), 380 .toname = name->name, 381 .tolen = name->len 382 }; 383 struct rpc_message msg = { 384 .rpc_proc = &nfs_procedures[NFSPROC_LINK], 385 .rpc_argp = &arg, 386 }; 387 int status; 388 389 dprintk("NFS call link %s\n", name->name); 390 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 391 nfs_mark_for_revalidate(inode); 392 nfs_mark_for_revalidate(dir); 393 dprintk("NFS reply link: %d\n", status); 394 return status; 395 } 396 397 static int 398 nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page, 399 unsigned int len, struct iattr *sattr) 400 { 401 struct nfs_fh *fh; 402 struct nfs_fattr *fattr; 403 struct nfs_symlinkargs arg = { 404 .fromfh = NFS_FH(dir), 405 .fromname = dentry->d_name.name, 406 .fromlen = dentry->d_name.len, 407 .pages = &page, 408 .pathlen = len, 409 .sattr = sattr 410 }; 411 struct rpc_message msg = { 412 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK], 413 .rpc_argp = &arg, 414 }; 415 int status = -ENAMETOOLONG; 416 417 dprintk("NFS call symlink %pd\n", dentry); 418 419 if (len > NFS2_MAXPATHLEN) 420 goto out; 421 422 fh = nfs_alloc_fhandle(); 423 fattr = nfs_alloc_fattr(); 424 status = -ENOMEM; 425 if (fh == NULL || fattr == NULL) 426 goto out_free; 427 428 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 429 nfs_mark_for_revalidate(dir); 430 431 /* 432 * V2 SYMLINK requests don't return any attributes. Setting the 433 * filehandle size to zero indicates to nfs_instantiate that it 434 * should fill in the data with a LOOKUP call on the wire. 435 */ 436 if (status == 0) 437 status = nfs_instantiate(dentry, fh, fattr); 438 439 out_free: 440 nfs_free_fattr(fattr); 441 nfs_free_fhandle(fh); 442 out: 443 dprintk("NFS reply symlink: %d\n", status); 444 return status; 445 } 446 447 static int 448 nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr) 449 { 450 struct nfs_createdata *data; 451 struct rpc_message msg = { 452 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR], 453 }; 454 int status = -ENOMEM; 455 456 dprintk("NFS call mkdir %pd\n", dentry); 457 data = nfs_alloc_createdata(dir, dentry, sattr); 458 if (data == NULL) 459 goto out; 460 msg.rpc_argp = &data->arg; 461 msg.rpc_resp = &data->res; 462 463 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 464 nfs_mark_for_revalidate(dir); 465 if (status == 0) 466 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 467 nfs_free_createdata(data); 468 out: 469 dprintk("NFS reply mkdir: %d\n", status); 470 return status; 471 } 472 473 static int 474 nfs_proc_rmdir(struct inode *dir, const struct qstr *name) 475 { 476 struct nfs_diropargs arg = { 477 .fh = NFS_FH(dir), 478 .name = name->name, 479 .len = name->len 480 }; 481 struct rpc_message msg = { 482 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR], 483 .rpc_argp = &arg, 484 }; 485 int status; 486 487 dprintk("NFS call rmdir %s\n", name->name); 488 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 489 nfs_mark_for_revalidate(dir); 490 dprintk("NFS reply rmdir: %d\n", status); 491 return status; 492 } 493 494 /* 495 * The READDIR implementation is somewhat hackish - we pass a temporary 496 * buffer to the encode function, which installs it in the receive 497 * the receive iovec. The decode function just parses the reply to make 498 * sure it is syntactically correct; the entries itself are decoded 499 * from nfs_readdir by calling the decode_entry function directly. 500 */ 501 static int nfs_proc_readdir(struct nfs_readdir_arg *nr_arg, 502 struct nfs_readdir_res *nr_res) 503 { 504 struct inode *dir = d_inode(nr_arg->dentry); 505 struct nfs_readdirargs arg = { 506 .fh = NFS_FH(dir), 507 .cookie = nr_arg->cookie, 508 .count = nr_arg->page_len, 509 .pages = nr_arg->pages, 510 }; 511 struct rpc_message msg = { 512 .rpc_proc = &nfs_procedures[NFSPROC_READDIR], 513 .rpc_argp = &arg, 514 .rpc_cred = nr_arg->cred, 515 }; 516 int status; 517 518 dprintk("NFS call readdir %llu\n", (unsigned long long)nr_arg->cookie); 519 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 520 nr_res->verf[0] = nr_res->verf[1] = 0; 521 522 nfs_invalidate_atime(dir); 523 524 dprintk("NFS reply readdir: %d\n", status); 525 return status; 526 } 527 528 static int 529 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 530 struct nfs_fsstat *stat) 531 { 532 struct nfs2_fsstat fsinfo; 533 struct rpc_message msg = { 534 .rpc_proc = &nfs_procedures[NFSPROC_STATFS], 535 .rpc_argp = fhandle, 536 .rpc_resp = &fsinfo, 537 }; 538 int status; 539 540 dprintk("NFS call statfs\n"); 541 nfs_fattr_init(stat->fattr); 542 status = rpc_call_sync(server->client, &msg, 0); 543 dprintk("NFS reply statfs: %d\n", status); 544 if (status) 545 goto out; 546 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize; 547 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize; 548 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize; 549 stat->tfiles = 0; 550 stat->ffiles = 0; 551 stat->afiles = 0; 552 out: 553 return status; 554 } 555 556 static int 557 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 558 struct nfs_fsinfo *info) 559 { 560 struct nfs2_fsstat fsinfo; 561 struct rpc_message msg = { 562 .rpc_proc = &nfs_procedures[NFSPROC_STATFS], 563 .rpc_argp = fhandle, 564 .rpc_resp = &fsinfo, 565 }; 566 int status; 567 568 dprintk("NFS call fsinfo\n"); 569 nfs_fattr_init(info->fattr); 570 status = rpc_call_sync(server->client, &msg, 0); 571 dprintk("NFS reply fsinfo: %d\n", status); 572 if (status) 573 goto out; 574 info->rtmax = NFS_MAXDATA; 575 info->rtpref = fsinfo.tsize; 576 info->rtmult = fsinfo.bsize; 577 info->wtmax = NFS_MAXDATA; 578 info->wtpref = fsinfo.tsize; 579 info->wtmult = fsinfo.bsize; 580 info->dtpref = fsinfo.tsize; 581 info->maxfilesize = 0x7FFFFFFF; 582 info->lease_time = 0; 583 out: 584 return status; 585 } 586 587 static int 588 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 589 struct nfs_pathconf *info) 590 { 591 info->max_link = 0; 592 info->max_namelen = NFS2_MAXNAMLEN; 593 return 0; 594 } 595 596 static int nfs_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 597 { 598 struct inode *inode = hdr->inode; 599 600 nfs_invalidate_atime(inode); 601 if (task->tk_status >= 0) { 602 nfs_refresh_inode(inode, hdr->res.fattr); 603 /* Emulate the eof flag, which isn't normally needed in NFSv2 604 * as it is guaranteed to always return the file attributes 605 */ 606 if ((hdr->res.count == 0 && hdr->args.count > 0) || 607 hdr->args.offset + hdr->res.count >= hdr->res.fattr->size) 608 hdr->res.eof = 1; 609 } 610 return 0; 611 } 612 613 static void nfs_proc_read_setup(struct nfs_pgio_header *hdr, 614 struct rpc_message *msg) 615 { 616 msg->rpc_proc = &nfs_procedures[NFSPROC_READ]; 617 } 618 619 static int nfs_proc_pgio_rpc_prepare(struct rpc_task *task, 620 struct nfs_pgio_header *hdr) 621 { 622 rpc_call_start(task); 623 return 0; 624 } 625 626 static int nfs_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 627 { 628 if (task->tk_status >= 0) { 629 hdr->res.count = hdr->args.count; 630 nfs_writeback_update_inode(hdr); 631 } 632 return 0; 633 } 634 635 static void nfs_proc_write_setup(struct nfs_pgio_header *hdr, 636 struct rpc_message *msg, 637 struct rpc_clnt **clnt) 638 { 639 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */ 640 hdr->args.stable = NFS_FILE_SYNC; 641 msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE]; 642 } 643 644 static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 645 { 646 BUG(); 647 } 648 649 static void 650 nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 651 struct rpc_clnt **clnt) 652 { 653 BUG(); 654 } 655 656 static int 657 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl) 658 { 659 struct inode *inode = file_inode(filp); 660 661 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, NULL); 662 } 663 664 /* Helper functions for NFS lock bounds checking */ 665 #define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL) 666 static int nfs_lock_check_bounds(const struct file_lock *fl) 667 { 668 __s32 start, end; 669 670 start = (__s32)fl->fl_start; 671 if ((loff_t)start != fl->fl_start) 672 goto out_einval; 673 674 if (fl->fl_end != OFFSET_MAX) { 675 end = (__s32)fl->fl_end; 676 if ((loff_t)end != fl->fl_end) 677 goto out_einval; 678 } else 679 end = NFS_LOCK32_OFFSET_MAX; 680 681 if (start < 0 || start > end) 682 goto out_einval; 683 return 0; 684 out_einval: 685 return -EINVAL; 686 } 687 688 static int nfs_have_delegation(struct inode *inode, fmode_t flags) 689 { 690 return 0; 691 } 692 693 static const struct inode_operations nfs_dir_inode_operations = { 694 .create = nfs_create, 695 .lookup = nfs_lookup, 696 .link = nfs_link, 697 .unlink = nfs_unlink, 698 .symlink = nfs_symlink, 699 .mkdir = nfs_mkdir, 700 .rmdir = nfs_rmdir, 701 .mknod = nfs_mknod, 702 .rename = nfs_rename, 703 .permission = nfs_permission, 704 .getattr = nfs_getattr, 705 .setattr = nfs_setattr, 706 }; 707 708 static const struct inode_operations nfs_file_inode_operations = { 709 .permission = nfs_permission, 710 .getattr = nfs_getattr, 711 .setattr = nfs_setattr, 712 }; 713 714 const struct nfs_rpc_ops nfs_v2_clientops = { 715 .version = 2, /* protocol version */ 716 .dentry_ops = &nfs_dentry_operations, 717 .dir_inode_ops = &nfs_dir_inode_operations, 718 .file_inode_ops = &nfs_file_inode_operations, 719 .file_ops = &nfs_file_operations, 720 .getroot = nfs_proc_get_root, 721 .submount = nfs_submount, 722 .try_get_tree = nfs_try_get_tree, 723 .getattr = nfs_proc_getattr, 724 .setattr = nfs_proc_setattr, 725 .lookup = nfs_proc_lookup, 726 .access = NULL, /* access */ 727 .readlink = nfs_proc_readlink, 728 .create = nfs_proc_create, 729 .remove = nfs_proc_remove, 730 .unlink_setup = nfs_proc_unlink_setup, 731 .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare, 732 .unlink_done = nfs_proc_unlink_done, 733 .rename_setup = nfs_proc_rename_setup, 734 .rename_rpc_prepare = nfs_proc_rename_rpc_prepare, 735 .rename_done = nfs_proc_rename_done, 736 .link = nfs_proc_link, 737 .symlink = nfs_proc_symlink, 738 .mkdir = nfs_proc_mkdir, 739 .rmdir = nfs_proc_rmdir, 740 .readdir = nfs_proc_readdir, 741 .mknod = nfs_proc_mknod, 742 .statfs = nfs_proc_statfs, 743 .fsinfo = nfs_proc_fsinfo, 744 .pathconf = nfs_proc_pathconf, 745 .decode_dirent = nfs2_decode_dirent, 746 .pgio_rpc_prepare = nfs_proc_pgio_rpc_prepare, 747 .read_setup = nfs_proc_read_setup, 748 .read_done = nfs_read_done, 749 .write_setup = nfs_proc_write_setup, 750 .write_done = nfs_write_done, 751 .commit_setup = nfs_proc_commit_setup, 752 .commit_rpc_prepare = nfs_proc_commit_rpc_prepare, 753 .lock = nfs_proc_lock, 754 .lock_check_bounds = nfs_lock_check_bounds, 755 .close_context = nfs_close_context, 756 .have_delegation = nfs_have_delegation, 757 .alloc_client = nfs_alloc_client, 758 .init_client = nfs_init_client, 759 .free_client = nfs_free_client, 760 .create_server = nfs_create_server, 761 .clone_server = nfs_clone_server, 762 }; 763