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->nfs_client->cl_rpcclient, &msg, 0); 69 dprintk("%s: reply getattr: %d\n", __func__, status); 70 if (status) 71 return status; 72 dprintk("%s: call statfs\n", __func__); 73 msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS]; 74 msg.rpc_resp = &fsinfo; 75 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0); 76 dprintk("%s: reply statfs: %d\n", __func__, status); 77 if (status) 78 return status; 79 info->rtmax = NFS_MAXDATA; 80 info->rtpref = fsinfo.tsize; 81 info->rtmult = fsinfo.bsize; 82 info->wtmax = NFS_MAXDATA; 83 info->wtpref = fsinfo.tsize; 84 info->wtmult = fsinfo.bsize; 85 info->dtpref = fsinfo.tsize; 86 info->maxfilesize = 0x7FFFFFFF; 87 info->lease_time = 0; 88 return 0; 89 } 90 91 /* 92 * One function for each procedure in the NFS protocol. 93 */ 94 static int 95 nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 96 struct nfs_fattr *fattr) 97 { 98 struct rpc_message msg = { 99 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR], 100 .rpc_argp = fhandle, 101 .rpc_resp = fattr, 102 }; 103 int status; 104 105 dprintk("NFS call getattr\n"); 106 nfs_fattr_init(fattr); 107 status = rpc_call_sync(server->client, &msg, 0); 108 dprintk("NFS reply getattr: %d\n", status); 109 return status; 110 } 111 112 static int 113 nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 114 struct iattr *sattr) 115 { 116 struct inode *inode = dentry->d_inode; 117 struct nfs_sattrargs arg = { 118 .fh = NFS_FH(inode), 119 .sattr = sattr 120 }; 121 struct rpc_message msg = { 122 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR], 123 .rpc_argp = &arg, 124 .rpc_resp = fattr, 125 }; 126 int status; 127 128 /* Mask out the non-modebit related stuff from attr->ia_mode */ 129 sattr->ia_mode &= S_IALLUGO; 130 131 dprintk("NFS call setattr\n"); 132 if (sattr->ia_valid & ATTR_FILE) 133 msg.rpc_cred = nfs_file_cred(sattr->ia_file); 134 nfs_fattr_init(fattr); 135 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 136 if (status == 0) 137 nfs_setattr_update_inode(inode, sattr); 138 dprintk("NFS reply setattr: %d\n", status); 139 return status; 140 } 141 142 static int 143 nfs_proc_lookup(struct inode *dir, struct qstr *name, 144 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 145 { 146 struct nfs_diropargs arg = { 147 .fh = NFS_FH(dir), 148 .name = name->name, 149 .len = name->len 150 }; 151 struct nfs_diropok res = { 152 .fh = fhandle, 153 .fattr = fattr 154 }; 155 struct rpc_message msg = { 156 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP], 157 .rpc_argp = &arg, 158 .rpc_resp = &res, 159 }; 160 int status; 161 162 dprintk("NFS call lookup %s\n", name->name); 163 nfs_fattr_init(fattr); 164 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 165 dprintk("NFS reply lookup: %d\n", status); 166 return status; 167 } 168 169 static int nfs_proc_readlink(struct inode *inode, struct page *page, 170 unsigned int pgbase, unsigned int pglen) 171 { 172 struct nfs_readlinkargs args = { 173 .fh = NFS_FH(inode), 174 .pgbase = pgbase, 175 .pglen = pglen, 176 .pages = &page 177 }; 178 struct rpc_message msg = { 179 .rpc_proc = &nfs_procedures[NFSPROC_READLINK], 180 .rpc_argp = &args, 181 }; 182 int status; 183 184 dprintk("NFS call readlink\n"); 185 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 186 dprintk("NFS reply readlink: %d\n", status); 187 return status; 188 } 189 190 static int 191 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 192 int flags, struct nameidata *nd) 193 { 194 struct nfs_fh fhandle; 195 struct nfs_fattr fattr; 196 struct nfs_createargs arg = { 197 .fh = NFS_FH(dir), 198 .name = dentry->d_name.name, 199 .len = dentry->d_name.len, 200 .sattr = sattr 201 }; 202 struct nfs_diropok res = { 203 .fh = &fhandle, 204 .fattr = &fattr 205 }; 206 struct rpc_message msg = { 207 .rpc_proc = &nfs_procedures[NFSPROC_CREATE], 208 .rpc_argp = &arg, 209 .rpc_resp = &res, 210 }; 211 int status; 212 213 nfs_fattr_init(&fattr); 214 dprintk("NFS call create %s\n", dentry->d_name.name); 215 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 216 nfs_mark_for_revalidate(dir); 217 if (status == 0) 218 status = nfs_instantiate(dentry, &fhandle, &fattr); 219 dprintk("NFS reply create: %d\n", status); 220 return status; 221 } 222 223 /* 224 * In NFSv2, mknod is grafted onto the create call. 225 */ 226 static int 227 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 228 dev_t rdev) 229 { 230 struct nfs_fh fhandle; 231 struct nfs_fattr fattr; 232 struct nfs_createargs arg = { 233 .fh = NFS_FH(dir), 234 .name = dentry->d_name.name, 235 .len = dentry->d_name.len, 236 .sattr = sattr 237 }; 238 struct nfs_diropok res = { 239 .fh = &fhandle, 240 .fattr = &fattr 241 }; 242 struct rpc_message msg = { 243 .rpc_proc = &nfs_procedures[NFSPROC_CREATE], 244 .rpc_argp = &arg, 245 .rpc_resp = &res, 246 }; 247 int status, mode; 248 249 dprintk("NFS call mknod %s\n", dentry->d_name.name); 250 251 mode = sattr->ia_mode; 252 if (S_ISFIFO(mode)) { 253 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR; 254 sattr->ia_valid &= ~ATTR_SIZE; 255 } else if (S_ISCHR(mode) || S_ISBLK(mode)) { 256 sattr->ia_valid |= ATTR_SIZE; 257 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */ 258 } 259 260 nfs_fattr_init(&fattr); 261 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 262 nfs_mark_for_revalidate(dir); 263 264 if (status == -EINVAL && S_ISFIFO(mode)) { 265 sattr->ia_mode = mode; 266 nfs_fattr_init(&fattr); 267 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 268 } 269 if (status == 0) 270 status = nfs_instantiate(dentry, &fhandle, &fattr); 271 dprintk("NFS reply mknod: %d\n", status); 272 return status; 273 } 274 275 static int 276 nfs_proc_remove(struct inode *dir, struct qstr *name) 277 { 278 struct nfs_removeargs arg = { 279 .fh = NFS_FH(dir), 280 .name.len = name->len, 281 .name.name = name->name, 282 }; 283 struct rpc_message msg = { 284 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE], 285 .rpc_argp = &arg, 286 }; 287 int status; 288 289 dprintk("NFS call remove %s\n", name->name); 290 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 291 nfs_mark_for_revalidate(dir); 292 293 dprintk("NFS reply remove: %d\n", status); 294 return status; 295 } 296 297 static void 298 nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir) 299 { 300 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE]; 301 } 302 303 static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir) 304 { 305 nfs_mark_for_revalidate(dir); 306 return 1; 307 } 308 309 static int 310 nfs_proc_rename(struct inode *old_dir, struct qstr *old_name, 311 struct inode *new_dir, struct qstr *new_name) 312 { 313 struct nfs_renameargs arg = { 314 .fromfh = NFS_FH(old_dir), 315 .fromname = old_name->name, 316 .fromlen = old_name->len, 317 .tofh = NFS_FH(new_dir), 318 .toname = new_name->name, 319 .tolen = new_name->len 320 }; 321 struct rpc_message msg = { 322 .rpc_proc = &nfs_procedures[NFSPROC_RENAME], 323 .rpc_argp = &arg, 324 }; 325 int status; 326 327 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name); 328 status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0); 329 nfs_mark_for_revalidate(old_dir); 330 nfs_mark_for_revalidate(new_dir); 331 dprintk("NFS reply rename: %d\n", status); 332 return status; 333 } 334 335 static int 336 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 337 { 338 struct nfs_linkargs arg = { 339 .fromfh = NFS_FH(inode), 340 .tofh = NFS_FH(dir), 341 .toname = name->name, 342 .tolen = name->len 343 }; 344 struct rpc_message msg = { 345 .rpc_proc = &nfs_procedures[NFSPROC_LINK], 346 .rpc_argp = &arg, 347 }; 348 int status; 349 350 dprintk("NFS call link %s\n", name->name); 351 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 352 nfs_mark_for_revalidate(inode); 353 nfs_mark_for_revalidate(dir); 354 dprintk("NFS reply link: %d\n", status); 355 return status; 356 } 357 358 static int 359 nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page, 360 unsigned int len, struct iattr *sattr) 361 { 362 struct nfs_fh fhandle; 363 struct nfs_fattr fattr; 364 struct nfs_symlinkargs arg = { 365 .fromfh = NFS_FH(dir), 366 .fromname = dentry->d_name.name, 367 .fromlen = dentry->d_name.len, 368 .pages = &page, 369 .pathlen = len, 370 .sattr = sattr 371 }; 372 struct rpc_message msg = { 373 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK], 374 .rpc_argp = &arg, 375 }; 376 int status; 377 378 if (len > NFS2_MAXPATHLEN) 379 return -ENAMETOOLONG; 380 381 dprintk("NFS call symlink %s\n", dentry->d_name.name); 382 383 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 384 nfs_mark_for_revalidate(dir); 385 386 /* 387 * V2 SYMLINK requests don't return any attributes. Setting the 388 * filehandle size to zero indicates to nfs_instantiate that it 389 * should fill in the data with a LOOKUP call on the wire. 390 */ 391 if (status == 0) { 392 nfs_fattr_init(&fattr); 393 fhandle.size = 0; 394 status = nfs_instantiate(dentry, &fhandle, &fattr); 395 } 396 397 dprintk("NFS reply symlink: %d\n", status); 398 return status; 399 } 400 401 static int 402 nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr) 403 { 404 struct nfs_fh fhandle; 405 struct nfs_fattr fattr; 406 struct nfs_createargs arg = { 407 .fh = NFS_FH(dir), 408 .name = dentry->d_name.name, 409 .len = dentry->d_name.len, 410 .sattr = sattr 411 }; 412 struct nfs_diropok res = { 413 .fh = &fhandle, 414 .fattr = &fattr 415 }; 416 struct rpc_message msg = { 417 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR], 418 .rpc_argp = &arg, 419 .rpc_resp = &res, 420 }; 421 int status; 422 423 dprintk("NFS call mkdir %s\n", dentry->d_name.name); 424 nfs_fattr_init(&fattr); 425 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 426 nfs_mark_for_revalidate(dir); 427 if (status == 0) 428 status = nfs_instantiate(dentry, &fhandle, &fattr); 429 dprintk("NFS reply mkdir: %d\n", status); 430 return status; 431 } 432 433 static int 434 nfs_proc_rmdir(struct inode *dir, struct qstr *name) 435 { 436 struct nfs_diropargs arg = { 437 .fh = NFS_FH(dir), 438 .name = name->name, 439 .len = name->len 440 }; 441 struct rpc_message msg = { 442 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR], 443 .rpc_argp = &arg, 444 }; 445 int status; 446 447 dprintk("NFS call rmdir %s\n", name->name); 448 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 449 nfs_mark_for_revalidate(dir); 450 dprintk("NFS reply rmdir: %d\n", status); 451 return status; 452 } 453 454 /* 455 * The READDIR implementation is somewhat hackish - we pass a temporary 456 * buffer to the encode function, which installs it in the receive 457 * the receive iovec. The decode function just parses the reply to make 458 * sure it is syntactically correct; the entries itself are decoded 459 * from nfs_readdir by calling the decode_entry function directly. 460 */ 461 static int 462 nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 463 u64 cookie, struct page *page, unsigned int count, int plus) 464 { 465 struct inode *dir = dentry->d_inode; 466 struct nfs_readdirargs arg = { 467 .fh = NFS_FH(dir), 468 .cookie = cookie, 469 .count = count, 470 .pages = &page, 471 }; 472 struct rpc_message msg = { 473 .rpc_proc = &nfs_procedures[NFSPROC_READDIR], 474 .rpc_argp = &arg, 475 .rpc_cred = cred, 476 }; 477 int status; 478 479 dprintk("NFS call readdir %d\n", (unsigned int)cookie); 480 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 481 482 nfs_invalidate_atime(dir); 483 484 dprintk("NFS reply readdir: %d\n", status); 485 return status; 486 } 487 488 static int 489 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 490 struct nfs_fsstat *stat) 491 { 492 struct nfs2_fsstat fsinfo; 493 struct rpc_message msg = { 494 .rpc_proc = &nfs_procedures[NFSPROC_STATFS], 495 .rpc_argp = fhandle, 496 .rpc_resp = &fsinfo, 497 }; 498 int status; 499 500 dprintk("NFS call statfs\n"); 501 nfs_fattr_init(stat->fattr); 502 status = rpc_call_sync(server->client, &msg, 0); 503 dprintk("NFS reply statfs: %d\n", status); 504 if (status) 505 goto out; 506 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize; 507 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize; 508 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize; 509 stat->tfiles = 0; 510 stat->ffiles = 0; 511 stat->afiles = 0; 512 out: 513 return status; 514 } 515 516 static int 517 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 518 struct nfs_fsinfo *info) 519 { 520 struct nfs2_fsstat fsinfo; 521 struct rpc_message msg = { 522 .rpc_proc = &nfs_procedures[NFSPROC_STATFS], 523 .rpc_argp = fhandle, 524 .rpc_resp = &fsinfo, 525 }; 526 int status; 527 528 dprintk("NFS call fsinfo\n"); 529 nfs_fattr_init(info->fattr); 530 status = rpc_call_sync(server->client, &msg, 0); 531 dprintk("NFS reply fsinfo: %d\n", status); 532 if (status) 533 goto out; 534 info->rtmax = NFS_MAXDATA; 535 info->rtpref = fsinfo.tsize; 536 info->rtmult = fsinfo.bsize; 537 info->wtmax = NFS_MAXDATA; 538 info->wtpref = fsinfo.tsize; 539 info->wtmult = fsinfo.bsize; 540 info->dtpref = fsinfo.tsize; 541 info->maxfilesize = 0x7FFFFFFF; 542 info->lease_time = 0; 543 out: 544 return status; 545 } 546 547 static int 548 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 549 struct nfs_pathconf *info) 550 { 551 info->max_link = 0; 552 info->max_namelen = NFS2_MAXNAMLEN; 553 return 0; 554 } 555 556 static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data) 557 { 558 nfs_invalidate_atime(data->inode); 559 if (task->tk_status >= 0) { 560 nfs_refresh_inode(data->inode, data->res.fattr); 561 /* Emulate the eof flag, which isn't normally needed in NFSv2 562 * as it is guaranteed to always return the file attributes 563 */ 564 if (data->args.offset + data->args.count >= data->res.fattr->size) 565 data->res.eof = 1; 566 } 567 return 0; 568 } 569 570 static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg) 571 { 572 msg->rpc_proc = &nfs_procedures[NFSPROC_READ]; 573 } 574 575 static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data) 576 { 577 if (task->tk_status >= 0) 578 nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr); 579 return 0; 580 } 581 582 static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg) 583 { 584 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */ 585 data->args.stable = NFS_FILE_SYNC; 586 msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE]; 587 } 588 589 static void 590 nfs_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg) 591 { 592 BUG(); 593 } 594 595 static int 596 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl) 597 { 598 struct inode *inode = filp->f_path.dentry->d_inode; 599 600 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl); 601 } 602 603 /* Helper functions for NFS lock bounds checking */ 604 #define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL) 605 static int nfs_lock_check_bounds(const struct file_lock *fl) 606 { 607 __s32 start, end; 608 609 start = (__s32)fl->fl_start; 610 if ((loff_t)start != fl->fl_start) 611 goto out_einval; 612 613 if (fl->fl_end != OFFSET_MAX) { 614 end = (__s32)fl->fl_end; 615 if ((loff_t)end != fl->fl_end) 616 goto out_einval; 617 } else 618 end = NFS_LOCK32_OFFSET_MAX; 619 620 if (start < 0 || start > end) 621 goto out_einval; 622 return 0; 623 out_einval: 624 return -EINVAL; 625 } 626 627 const struct nfs_rpc_ops nfs_v2_clientops = { 628 .version = 2, /* protocol version */ 629 .dentry_ops = &nfs_dentry_operations, 630 .dir_inode_ops = &nfs_dir_inode_operations, 631 .file_inode_ops = &nfs_file_inode_operations, 632 .getroot = nfs_proc_get_root, 633 .getattr = nfs_proc_getattr, 634 .setattr = nfs_proc_setattr, 635 .lookup = nfs_proc_lookup, 636 .access = NULL, /* access */ 637 .readlink = nfs_proc_readlink, 638 .create = nfs_proc_create, 639 .remove = nfs_proc_remove, 640 .unlink_setup = nfs_proc_unlink_setup, 641 .unlink_done = nfs_proc_unlink_done, 642 .rename = nfs_proc_rename, 643 .link = nfs_proc_link, 644 .symlink = nfs_proc_symlink, 645 .mkdir = nfs_proc_mkdir, 646 .rmdir = nfs_proc_rmdir, 647 .readdir = nfs_proc_readdir, 648 .mknod = nfs_proc_mknod, 649 .statfs = nfs_proc_statfs, 650 .fsinfo = nfs_proc_fsinfo, 651 .pathconf = nfs_proc_pathconf, 652 .decode_dirent = nfs_decode_dirent, 653 .read_setup = nfs_proc_read_setup, 654 .read_done = nfs_read_done, 655 .write_setup = nfs_proc_write_setup, 656 .write_done = nfs_write_done, 657 .commit_setup = nfs_proc_commit_setup, 658 .lock = nfs_proc_lock, 659 .lock_check_bounds = nfs_lock_check_bounds, 660 }; 661