1 /* 2 * linux/fs/nfs/proc.c 3 * 4 * Copyright (C) 1992, 1993, 1994 Rick Sladkey 5 * 6 * OS-independent nfs remote procedure call functions 7 * 8 * Tuned by Alan Cox <A.Cox@swansea.ac.uk> for >3K buffers 9 * so at last we can have decent(ish) throughput off a 10 * Sun server. 11 * 12 * Coding optimized and cleaned up by Florian La Roche. 13 * Note: Error returns are optimized for NFS_OK, which isn't translated via 14 * nfs_stat_to_errno(), but happens to be already the right return code. 15 * 16 * Also, the code currently doesn't check the size of the packet, when 17 * it decodes the packet. 18 * 19 * Feel free to fix it and mail me the diffs if it worries you. 20 * 21 * Completely rewritten to support the new RPC call interface; 22 * rewrote and moved the entire XDR stuff to xdr.c 23 * --Olaf Kirch June 1996 24 * 25 * The code below initializes all auto variables explicitly, otherwise 26 * it will fail to work as a module (gcc generates a memset call for an 27 * incomplete struct). 28 */ 29 30 #include <linux/types.h> 31 #include <linux/param.h> 32 #include <linux/slab.h> 33 #include <linux/time.h> 34 #include <linux/mm.h> 35 #include <linux/utsname.h> 36 #include <linux/errno.h> 37 #include <linux/string.h> 38 #include <linux/in.h> 39 #include <linux/pagemap.h> 40 #include <linux/sunrpc/clnt.h> 41 #include <linux/nfs.h> 42 #include <linux/nfs2.h> 43 #include <linux/nfs_fs.h> 44 #include <linux/nfs_page.h> 45 #include <linux/lockd/bind.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 return 0; 95 } 96 97 /* 98 * One function for each procedure in the NFS protocol. 99 */ 100 static int 101 nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 102 struct nfs_fattr *fattr) 103 { 104 struct rpc_message msg = { 105 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR], 106 .rpc_argp = fhandle, 107 .rpc_resp = fattr, 108 }; 109 int status; 110 111 dprintk("NFS call getattr\n"); 112 nfs_fattr_init(fattr); 113 status = rpc_call_sync(server->client, &msg, 0); 114 dprintk("NFS reply getattr: %d\n", status); 115 return status; 116 } 117 118 static int 119 nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 120 struct iattr *sattr) 121 { 122 struct inode *inode = dentry->d_inode; 123 struct nfs_sattrargs arg = { 124 .fh = NFS_FH(inode), 125 .sattr = sattr 126 }; 127 struct rpc_message msg = { 128 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR], 129 .rpc_argp = &arg, 130 .rpc_resp = fattr, 131 }; 132 int status; 133 134 /* Mask out the non-modebit related stuff from attr->ia_mode */ 135 sattr->ia_mode &= S_IALLUGO; 136 137 dprintk("NFS call setattr\n"); 138 if (sattr->ia_valid & ATTR_FILE) 139 msg.rpc_cred = nfs_file_cred(sattr->ia_file); 140 nfs_fattr_init(fattr); 141 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 142 if (status == 0) 143 nfs_setattr_update_inode(inode, sattr); 144 dprintk("NFS reply setattr: %d\n", status); 145 return status; 146 } 147 148 static int 149 nfs_proc_lookup(struct inode *dir, struct qstr *name, 150 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 151 { 152 struct nfs_diropargs arg = { 153 .fh = NFS_FH(dir), 154 .name = name->name, 155 .len = name->len 156 }; 157 struct nfs_diropok res = { 158 .fh = fhandle, 159 .fattr = fattr 160 }; 161 struct rpc_message msg = { 162 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP], 163 .rpc_argp = &arg, 164 .rpc_resp = &res, 165 }; 166 int status; 167 168 dprintk("NFS call lookup %s\n", name->name); 169 nfs_fattr_init(fattr); 170 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 171 dprintk("NFS reply lookup: %d\n", status); 172 return status; 173 } 174 175 static int nfs_proc_readlink(struct inode *inode, struct page *page, 176 unsigned int pgbase, unsigned int pglen) 177 { 178 struct nfs_readlinkargs args = { 179 .fh = NFS_FH(inode), 180 .pgbase = pgbase, 181 .pglen = pglen, 182 .pages = &page 183 }; 184 struct rpc_message msg = { 185 .rpc_proc = &nfs_procedures[NFSPROC_READLINK], 186 .rpc_argp = &args, 187 }; 188 int status; 189 190 dprintk("NFS call readlink\n"); 191 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 192 dprintk("NFS reply readlink: %d\n", status); 193 return status; 194 } 195 196 static int 197 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 198 int flags, struct nameidata *nd) 199 { 200 struct nfs_fh fhandle; 201 struct nfs_fattr fattr; 202 struct nfs_createargs arg = { 203 .fh = NFS_FH(dir), 204 .name = dentry->d_name.name, 205 .len = dentry->d_name.len, 206 .sattr = sattr 207 }; 208 struct nfs_diropok res = { 209 .fh = &fhandle, 210 .fattr = &fattr 211 }; 212 struct rpc_message msg = { 213 .rpc_proc = &nfs_procedures[NFSPROC_CREATE], 214 .rpc_argp = &arg, 215 .rpc_resp = &res, 216 }; 217 int status; 218 219 nfs_fattr_init(&fattr); 220 dprintk("NFS call create %s\n", dentry->d_name.name); 221 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 222 nfs_mark_for_revalidate(dir); 223 if (status == 0) 224 status = nfs_instantiate(dentry, &fhandle, &fattr); 225 dprintk("NFS reply create: %d\n", status); 226 return status; 227 } 228 229 /* 230 * In NFSv2, mknod is grafted onto the create call. 231 */ 232 static int 233 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 234 dev_t rdev) 235 { 236 struct nfs_fh fhandle; 237 struct nfs_fattr fattr; 238 struct nfs_createargs arg = { 239 .fh = NFS_FH(dir), 240 .name = dentry->d_name.name, 241 .len = dentry->d_name.len, 242 .sattr = sattr 243 }; 244 struct nfs_diropok res = { 245 .fh = &fhandle, 246 .fattr = &fattr 247 }; 248 struct rpc_message msg = { 249 .rpc_proc = &nfs_procedures[NFSPROC_CREATE], 250 .rpc_argp = &arg, 251 .rpc_resp = &res, 252 }; 253 int status, mode; 254 255 dprintk("NFS call mknod %s\n", dentry->d_name.name); 256 257 mode = sattr->ia_mode; 258 if (S_ISFIFO(mode)) { 259 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR; 260 sattr->ia_valid &= ~ATTR_SIZE; 261 } else if (S_ISCHR(mode) || S_ISBLK(mode)) { 262 sattr->ia_valid |= ATTR_SIZE; 263 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */ 264 } 265 266 nfs_fattr_init(&fattr); 267 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 268 nfs_mark_for_revalidate(dir); 269 270 if (status == -EINVAL && S_ISFIFO(mode)) { 271 sattr->ia_mode = mode; 272 nfs_fattr_init(&fattr); 273 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 274 } 275 if (status == 0) 276 status = nfs_instantiate(dentry, &fhandle, &fattr); 277 dprintk("NFS reply mknod: %d\n", status); 278 return status; 279 } 280 281 static int 282 nfs_proc_remove(struct inode *dir, struct qstr *name) 283 { 284 struct nfs_removeargs arg = { 285 .fh = NFS_FH(dir), 286 .name.len = name->len, 287 .name.name = name->name, 288 }; 289 struct rpc_message msg = { 290 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE], 291 .rpc_argp = &arg, 292 }; 293 int status; 294 295 dprintk("NFS call remove %s\n", name->name); 296 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 297 nfs_mark_for_revalidate(dir); 298 299 dprintk("NFS reply remove: %d\n", status); 300 return status; 301 } 302 303 static void 304 nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir) 305 { 306 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE]; 307 } 308 309 static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir) 310 { 311 nfs_mark_for_revalidate(dir); 312 return 1; 313 } 314 315 static int 316 nfs_proc_rename(struct inode *old_dir, struct qstr *old_name, 317 struct inode *new_dir, struct qstr *new_name) 318 { 319 struct nfs_renameargs arg = { 320 .fromfh = NFS_FH(old_dir), 321 .fromname = old_name->name, 322 .fromlen = old_name->len, 323 .tofh = NFS_FH(new_dir), 324 .toname = new_name->name, 325 .tolen = new_name->len 326 }; 327 struct rpc_message msg = { 328 .rpc_proc = &nfs_procedures[NFSPROC_RENAME], 329 .rpc_argp = &arg, 330 }; 331 int status; 332 333 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name); 334 status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0); 335 nfs_mark_for_revalidate(old_dir); 336 nfs_mark_for_revalidate(new_dir); 337 dprintk("NFS reply rename: %d\n", status); 338 return status; 339 } 340 341 static int 342 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 343 { 344 struct nfs_linkargs arg = { 345 .fromfh = NFS_FH(inode), 346 .tofh = NFS_FH(dir), 347 .toname = name->name, 348 .tolen = name->len 349 }; 350 struct rpc_message msg = { 351 .rpc_proc = &nfs_procedures[NFSPROC_LINK], 352 .rpc_argp = &arg, 353 }; 354 int status; 355 356 dprintk("NFS call link %s\n", name->name); 357 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 358 nfs_mark_for_revalidate(inode); 359 nfs_mark_for_revalidate(dir); 360 dprintk("NFS reply link: %d\n", status); 361 return status; 362 } 363 364 static int 365 nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page, 366 unsigned int len, struct iattr *sattr) 367 { 368 struct nfs_fh fhandle; 369 struct nfs_fattr fattr; 370 struct nfs_symlinkargs arg = { 371 .fromfh = NFS_FH(dir), 372 .fromname = dentry->d_name.name, 373 .fromlen = dentry->d_name.len, 374 .pages = &page, 375 .pathlen = len, 376 .sattr = sattr 377 }; 378 struct rpc_message msg = { 379 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK], 380 .rpc_argp = &arg, 381 }; 382 int status; 383 384 if (len > NFS2_MAXPATHLEN) 385 return -ENAMETOOLONG; 386 387 dprintk("NFS call symlink %s\n", dentry->d_name.name); 388 389 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 390 nfs_mark_for_revalidate(dir); 391 392 /* 393 * V2 SYMLINK requests don't return any attributes. Setting the 394 * filehandle size to zero indicates to nfs_instantiate that it 395 * should fill in the data with a LOOKUP call on the wire. 396 */ 397 if (status == 0) { 398 nfs_fattr_init(&fattr); 399 fhandle.size = 0; 400 status = nfs_instantiate(dentry, &fhandle, &fattr); 401 } 402 403 dprintk("NFS reply symlink: %d\n", status); 404 return status; 405 } 406 407 static int 408 nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr) 409 { 410 struct nfs_fh fhandle; 411 struct nfs_fattr fattr; 412 struct nfs_createargs arg = { 413 .fh = NFS_FH(dir), 414 .name = dentry->d_name.name, 415 .len = dentry->d_name.len, 416 .sattr = sattr 417 }; 418 struct nfs_diropok res = { 419 .fh = &fhandle, 420 .fattr = &fattr 421 }; 422 struct rpc_message msg = { 423 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR], 424 .rpc_argp = &arg, 425 .rpc_resp = &res, 426 }; 427 int status; 428 429 dprintk("NFS call mkdir %s\n", dentry->d_name.name); 430 nfs_fattr_init(&fattr); 431 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 432 nfs_mark_for_revalidate(dir); 433 if (status == 0) 434 status = nfs_instantiate(dentry, &fhandle, &fattr); 435 dprintk("NFS reply mkdir: %d\n", status); 436 return status; 437 } 438 439 static int 440 nfs_proc_rmdir(struct inode *dir, struct qstr *name) 441 { 442 struct nfs_diropargs arg = { 443 .fh = NFS_FH(dir), 444 .name = name->name, 445 .len = name->len 446 }; 447 struct rpc_message msg = { 448 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR], 449 .rpc_argp = &arg, 450 }; 451 int status; 452 453 dprintk("NFS call rmdir %s\n", name->name); 454 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 455 nfs_mark_for_revalidate(dir); 456 dprintk("NFS reply rmdir: %d\n", status); 457 return status; 458 } 459 460 /* 461 * The READDIR implementation is somewhat hackish - we pass a temporary 462 * buffer to the encode function, which installs it in the receive 463 * the receive iovec. The decode function just parses the reply to make 464 * sure it is syntactically correct; the entries itself are decoded 465 * from nfs_readdir by calling the decode_entry function directly. 466 */ 467 static int 468 nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 469 u64 cookie, struct page *page, unsigned int count, int plus) 470 { 471 struct inode *dir = dentry->d_inode; 472 struct nfs_readdirargs arg = { 473 .fh = NFS_FH(dir), 474 .cookie = cookie, 475 .count = count, 476 .pages = &page, 477 }; 478 struct rpc_message msg = { 479 .rpc_proc = &nfs_procedures[NFSPROC_READDIR], 480 .rpc_argp = &arg, 481 .rpc_cred = cred, 482 }; 483 int status; 484 485 dprintk("NFS call readdir %d\n", (unsigned int)cookie); 486 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 487 488 nfs_invalidate_atime(dir); 489 490 dprintk("NFS reply readdir: %d\n", status); 491 return status; 492 } 493 494 static int 495 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 496 struct nfs_fsstat *stat) 497 { 498 struct nfs2_fsstat fsinfo; 499 struct rpc_message msg = { 500 .rpc_proc = &nfs_procedures[NFSPROC_STATFS], 501 .rpc_argp = fhandle, 502 .rpc_resp = &fsinfo, 503 }; 504 int status; 505 506 dprintk("NFS call statfs\n"); 507 nfs_fattr_init(stat->fattr); 508 status = rpc_call_sync(server->client, &msg, 0); 509 dprintk("NFS reply statfs: %d\n", status); 510 if (status) 511 goto out; 512 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize; 513 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize; 514 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize; 515 stat->tfiles = 0; 516 stat->ffiles = 0; 517 stat->afiles = 0; 518 out: 519 return status; 520 } 521 522 static int 523 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 524 struct nfs_fsinfo *info) 525 { 526 struct nfs2_fsstat fsinfo; 527 struct rpc_message msg = { 528 .rpc_proc = &nfs_procedures[NFSPROC_STATFS], 529 .rpc_argp = fhandle, 530 .rpc_resp = &fsinfo, 531 }; 532 int status; 533 534 dprintk("NFS call fsinfo\n"); 535 nfs_fattr_init(info->fattr); 536 status = rpc_call_sync(server->client, &msg, 0); 537 dprintk("NFS reply fsinfo: %d\n", status); 538 if (status) 539 goto out; 540 info->rtmax = NFS_MAXDATA; 541 info->rtpref = fsinfo.tsize; 542 info->rtmult = fsinfo.bsize; 543 info->wtmax = NFS_MAXDATA; 544 info->wtpref = fsinfo.tsize; 545 info->wtmult = fsinfo.bsize; 546 info->dtpref = fsinfo.tsize; 547 info->maxfilesize = 0x7FFFFFFF; 548 info->lease_time = 0; 549 out: 550 return status; 551 } 552 553 static int 554 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 555 struct nfs_pathconf *info) 556 { 557 info->max_link = 0; 558 info->max_namelen = NFS2_MAXNAMLEN; 559 return 0; 560 } 561 562 static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data) 563 { 564 nfs_invalidate_atime(data->inode); 565 if (task->tk_status >= 0) { 566 nfs_refresh_inode(data->inode, data->res.fattr); 567 /* Emulate the eof flag, which isn't normally needed in NFSv2 568 * as it is guaranteed to always return the file attributes 569 */ 570 if (data->args.offset + data->args.count >= data->res.fattr->size) 571 data->res.eof = 1; 572 } 573 return 0; 574 } 575 576 static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg) 577 { 578 msg->rpc_proc = &nfs_procedures[NFSPROC_READ]; 579 } 580 581 static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data) 582 { 583 if (task->tk_status >= 0) 584 nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr); 585 return 0; 586 } 587 588 static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg) 589 { 590 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */ 591 data->args.stable = NFS_FILE_SYNC; 592 msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE]; 593 } 594 595 static void 596 nfs_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg) 597 { 598 BUG(); 599 } 600 601 static int 602 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl) 603 { 604 struct inode *inode = filp->f_path.dentry->d_inode; 605 606 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl); 607 } 608 609 /* Helper functions for NFS lock bounds checking */ 610 #define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL) 611 static int nfs_lock_check_bounds(const struct file_lock *fl) 612 { 613 __s32 start, end; 614 615 start = (__s32)fl->fl_start; 616 if ((loff_t)start != fl->fl_start) 617 goto out_einval; 618 619 if (fl->fl_end != OFFSET_MAX) { 620 end = (__s32)fl->fl_end; 621 if ((loff_t)end != fl->fl_end) 622 goto out_einval; 623 } else 624 end = NFS_LOCK32_OFFSET_MAX; 625 626 if (start < 0 || start > end) 627 goto out_einval; 628 return 0; 629 out_einval: 630 return -EINVAL; 631 } 632 633 const struct nfs_rpc_ops nfs_v2_clientops = { 634 .version = 2, /* protocol version */ 635 .dentry_ops = &nfs_dentry_operations, 636 .dir_inode_ops = &nfs_dir_inode_operations, 637 .file_inode_ops = &nfs_file_inode_operations, 638 .getroot = nfs_proc_get_root, 639 .getattr = nfs_proc_getattr, 640 .setattr = nfs_proc_setattr, 641 .lookup = nfs_proc_lookup, 642 .access = NULL, /* access */ 643 .readlink = nfs_proc_readlink, 644 .create = nfs_proc_create, 645 .remove = nfs_proc_remove, 646 .unlink_setup = nfs_proc_unlink_setup, 647 .unlink_done = nfs_proc_unlink_done, 648 .rename = nfs_proc_rename, 649 .link = nfs_proc_link, 650 .symlink = nfs_proc_symlink, 651 .mkdir = nfs_proc_mkdir, 652 .rmdir = nfs_proc_rmdir, 653 .readdir = nfs_proc_readdir, 654 .mknod = nfs_proc_mknod, 655 .statfs = nfs_proc_statfs, 656 .fsinfo = nfs_proc_fsinfo, 657 .pathconf = nfs_proc_pathconf, 658 .decode_dirent = nfs_decode_dirent, 659 .read_setup = nfs_proc_read_setup, 660 .read_done = nfs_read_done, 661 .write_setup = nfs_proc_write_setup, 662 .write_done = nfs_write_done, 663 .commit_setup = nfs_proc_commit_setup, 664 .lock = nfs_proc_lock, 665 .lock_check_bounds = nfs_lock_check_bounds, 666 }; 667