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", __FUNCTION__); 67 nfs_fattr_init(fattr); 68 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0); 69 dprintk("%s: reply getattr: %d\n", __FUNCTION__, status); 70 if (status) 71 return status; 72 dprintk("%s: call statfs\n", __FUNCTION__); 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", __FUNCTION__, 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 nfs_fattr_init(fattr); 133 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 134 if (status == 0) 135 nfs_setattr_update_inode(inode, sattr); 136 dprintk("NFS reply setattr: %d\n", status); 137 return status; 138 } 139 140 static int 141 nfs_proc_lookup(struct inode *dir, struct qstr *name, 142 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 143 { 144 struct nfs_diropargs arg = { 145 .fh = NFS_FH(dir), 146 .name = name->name, 147 .len = name->len 148 }; 149 struct nfs_diropok res = { 150 .fh = fhandle, 151 .fattr = fattr 152 }; 153 struct rpc_message msg = { 154 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP], 155 .rpc_argp = &arg, 156 .rpc_resp = &res, 157 }; 158 int status; 159 160 dprintk("NFS call lookup %s\n", name->name); 161 nfs_fattr_init(fattr); 162 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 163 dprintk("NFS reply lookup: %d\n", status); 164 return status; 165 } 166 167 static int nfs_proc_readlink(struct inode *inode, struct page *page, 168 unsigned int pgbase, unsigned int pglen) 169 { 170 struct nfs_readlinkargs args = { 171 .fh = NFS_FH(inode), 172 .pgbase = pgbase, 173 .pglen = pglen, 174 .pages = &page 175 }; 176 struct rpc_message msg = { 177 .rpc_proc = &nfs_procedures[NFSPROC_READLINK], 178 .rpc_argp = &args, 179 }; 180 int status; 181 182 dprintk("NFS call readlink\n"); 183 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 184 dprintk("NFS reply readlink: %d\n", status); 185 return status; 186 } 187 188 static int 189 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 190 int flags, struct nameidata *nd) 191 { 192 struct nfs_fh fhandle; 193 struct nfs_fattr fattr; 194 struct nfs_createargs arg = { 195 .fh = NFS_FH(dir), 196 .name = dentry->d_name.name, 197 .len = dentry->d_name.len, 198 .sattr = sattr 199 }; 200 struct nfs_diropok res = { 201 .fh = &fhandle, 202 .fattr = &fattr 203 }; 204 struct rpc_message msg = { 205 .rpc_proc = &nfs_procedures[NFSPROC_CREATE], 206 .rpc_argp = &arg, 207 .rpc_resp = &res, 208 }; 209 int status; 210 211 nfs_fattr_init(&fattr); 212 dprintk("NFS call create %s\n", dentry->d_name.name); 213 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 214 if (status == 0) 215 status = nfs_instantiate(dentry, &fhandle, &fattr); 216 dprintk("NFS reply create: %d\n", status); 217 return status; 218 } 219 220 /* 221 * In NFSv2, mknod is grafted onto the create call. 222 */ 223 static int 224 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 225 dev_t rdev) 226 { 227 struct nfs_fh fhandle; 228 struct nfs_fattr fattr; 229 struct nfs_createargs arg = { 230 .fh = NFS_FH(dir), 231 .name = dentry->d_name.name, 232 .len = dentry->d_name.len, 233 .sattr = sattr 234 }; 235 struct nfs_diropok res = { 236 .fh = &fhandle, 237 .fattr = &fattr 238 }; 239 struct rpc_message msg = { 240 .rpc_proc = &nfs_procedures[NFSPROC_CREATE], 241 .rpc_argp = &arg, 242 .rpc_resp = &res, 243 }; 244 int status, mode; 245 246 dprintk("NFS call mknod %s\n", dentry->d_name.name); 247 248 mode = sattr->ia_mode; 249 if (S_ISFIFO(mode)) { 250 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR; 251 sattr->ia_valid &= ~ATTR_SIZE; 252 } else if (S_ISCHR(mode) || S_ISBLK(mode)) { 253 sattr->ia_valid |= ATTR_SIZE; 254 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */ 255 } 256 257 nfs_fattr_init(&fattr); 258 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 259 nfs_mark_for_revalidate(dir); 260 261 if (status == -EINVAL && S_ISFIFO(mode)) { 262 sattr->ia_mode = mode; 263 nfs_fattr_init(&fattr); 264 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 265 } 266 if (status == 0) 267 status = nfs_instantiate(dentry, &fhandle, &fattr); 268 dprintk("NFS reply mknod: %d\n", status); 269 return status; 270 } 271 272 static int 273 nfs_proc_remove(struct inode *dir, struct qstr *name) 274 { 275 struct nfs_removeargs arg = { 276 .fh = NFS_FH(dir), 277 .name.len = name->len, 278 .name.name = name->name, 279 }; 280 struct rpc_message msg = { 281 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE], 282 .rpc_argp = &arg, 283 }; 284 int status; 285 286 dprintk("NFS call remove %s\n", name->name); 287 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 288 nfs_mark_for_revalidate(dir); 289 290 dprintk("NFS reply remove: %d\n", status); 291 return status; 292 } 293 294 static void 295 nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir) 296 { 297 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE]; 298 } 299 300 static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir) 301 { 302 nfs_mark_for_revalidate(dir); 303 return 1; 304 } 305 306 static int 307 nfs_proc_rename(struct inode *old_dir, struct qstr *old_name, 308 struct inode *new_dir, struct qstr *new_name) 309 { 310 struct nfs_renameargs arg = { 311 .fromfh = NFS_FH(old_dir), 312 .fromname = old_name->name, 313 .fromlen = old_name->len, 314 .tofh = NFS_FH(new_dir), 315 .toname = new_name->name, 316 .tolen = new_name->len 317 }; 318 struct rpc_message msg = { 319 .rpc_proc = &nfs_procedures[NFSPROC_RENAME], 320 .rpc_argp = &arg, 321 }; 322 int status; 323 324 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name); 325 status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0); 326 nfs_mark_for_revalidate(old_dir); 327 nfs_mark_for_revalidate(new_dir); 328 dprintk("NFS reply rename: %d\n", status); 329 return status; 330 } 331 332 static int 333 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 334 { 335 struct nfs_linkargs arg = { 336 .fromfh = NFS_FH(inode), 337 .tofh = NFS_FH(dir), 338 .toname = name->name, 339 .tolen = name->len 340 }; 341 struct rpc_message msg = { 342 .rpc_proc = &nfs_procedures[NFSPROC_LINK], 343 .rpc_argp = &arg, 344 }; 345 int status; 346 347 dprintk("NFS call link %s\n", name->name); 348 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 349 nfs_mark_for_revalidate(inode); 350 nfs_mark_for_revalidate(dir); 351 dprintk("NFS reply link: %d\n", status); 352 return status; 353 } 354 355 static int 356 nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page, 357 unsigned int len, struct iattr *sattr) 358 { 359 struct nfs_fh fhandle; 360 struct nfs_fattr fattr; 361 struct nfs_symlinkargs arg = { 362 .fromfh = NFS_FH(dir), 363 .fromname = dentry->d_name.name, 364 .fromlen = dentry->d_name.len, 365 .pages = &page, 366 .pathlen = len, 367 .sattr = sattr 368 }; 369 struct rpc_message msg = { 370 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK], 371 .rpc_argp = &arg, 372 }; 373 int status; 374 375 if (len > NFS2_MAXPATHLEN) 376 return -ENAMETOOLONG; 377 378 dprintk("NFS call symlink %s\n", dentry->d_name.name); 379 380 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 381 nfs_mark_for_revalidate(dir); 382 383 /* 384 * V2 SYMLINK requests don't return any attributes. Setting the 385 * filehandle size to zero indicates to nfs_instantiate that it 386 * should fill in the data with a LOOKUP call on the wire. 387 */ 388 if (status == 0) { 389 nfs_fattr_init(&fattr); 390 fhandle.size = 0; 391 status = nfs_instantiate(dentry, &fhandle, &fattr); 392 } 393 394 dprintk("NFS reply symlink: %d\n", status); 395 return status; 396 } 397 398 static int 399 nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr) 400 { 401 struct nfs_fh fhandle; 402 struct nfs_fattr fattr; 403 struct nfs_createargs arg = { 404 .fh = NFS_FH(dir), 405 .name = dentry->d_name.name, 406 .len = dentry->d_name.len, 407 .sattr = sattr 408 }; 409 struct nfs_diropok res = { 410 .fh = &fhandle, 411 .fattr = &fattr 412 }; 413 struct rpc_message msg = { 414 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR], 415 .rpc_argp = &arg, 416 .rpc_resp = &res, 417 }; 418 int status; 419 420 dprintk("NFS call mkdir %s\n", dentry->d_name.name); 421 nfs_fattr_init(&fattr); 422 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 423 nfs_mark_for_revalidate(dir); 424 if (status == 0) 425 status = nfs_instantiate(dentry, &fhandle, &fattr); 426 dprintk("NFS reply mkdir: %d\n", status); 427 return status; 428 } 429 430 static int 431 nfs_proc_rmdir(struct inode *dir, struct qstr *name) 432 { 433 struct nfs_diropargs arg = { 434 .fh = NFS_FH(dir), 435 .name = name->name, 436 .len = name->len 437 }; 438 struct rpc_message msg = { 439 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR], 440 .rpc_argp = &arg, 441 }; 442 int status; 443 444 dprintk("NFS call rmdir %s\n", name->name); 445 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 446 nfs_mark_for_revalidate(dir); 447 dprintk("NFS reply rmdir: %d\n", status); 448 return status; 449 } 450 451 /* 452 * The READDIR implementation is somewhat hackish - we pass a temporary 453 * buffer to the encode function, which installs it in the receive 454 * the receive iovec. The decode function just parses the reply to make 455 * sure it is syntactically correct; the entries itself are decoded 456 * from nfs_readdir by calling the decode_entry function directly. 457 */ 458 static int 459 nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 460 u64 cookie, struct page *page, unsigned int count, int plus) 461 { 462 struct inode *dir = dentry->d_inode; 463 struct nfs_readdirargs arg = { 464 .fh = NFS_FH(dir), 465 .cookie = cookie, 466 .count = count, 467 .pages = &page, 468 }; 469 struct rpc_message msg = { 470 .rpc_proc = &nfs_procedures[NFSPROC_READDIR], 471 .rpc_argp = &arg, 472 .rpc_cred = cred, 473 }; 474 int status; 475 476 dprintk("NFS call readdir %d\n", (unsigned int)cookie); 477 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 478 479 nfs_invalidate_atime(dir); 480 481 dprintk("NFS reply readdir: %d\n", status); 482 return status; 483 } 484 485 static int 486 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 487 struct nfs_fsstat *stat) 488 { 489 struct nfs2_fsstat fsinfo; 490 struct rpc_message msg = { 491 .rpc_proc = &nfs_procedures[NFSPROC_STATFS], 492 .rpc_argp = fhandle, 493 .rpc_resp = &fsinfo, 494 }; 495 int status; 496 497 dprintk("NFS call statfs\n"); 498 nfs_fattr_init(stat->fattr); 499 status = rpc_call_sync(server->client, &msg, 0); 500 dprintk("NFS reply statfs: %d\n", status); 501 if (status) 502 goto out; 503 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize; 504 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize; 505 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize; 506 stat->tfiles = 0; 507 stat->ffiles = 0; 508 stat->afiles = 0; 509 out: 510 return status; 511 } 512 513 static int 514 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 515 struct nfs_fsinfo *info) 516 { 517 struct nfs2_fsstat fsinfo; 518 struct rpc_message msg = { 519 .rpc_proc = &nfs_procedures[NFSPROC_STATFS], 520 .rpc_argp = fhandle, 521 .rpc_resp = &fsinfo, 522 }; 523 int status; 524 525 dprintk("NFS call fsinfo\n"); 526 nfs_fattr_init(info->fattr); 527 status = rpc_call_sync(server->client, &msg, 0); 528 dprintk("NFS reply fsinfo: %d\n", status); 529 if (status) 530 goto out; 531 info->rtmax = NFS_MAXDATA; 532 info->rtpref = fsinfo.tsize; 533 info->rtmult = fsinfo.bsize; 534 info->wtmax = NFS_MAXDATA; 535 info->wtpref = fsinfo.tsize; 536 info->wtmult = fsinfo.bsize; 537 info->dtpref = fsinfo.tsize; 538 info->maxfilesize = 0x7FFFFFFF; 539 info->lease_time = 0; 540 out: 541 return status; 542 } 543 544 static int 545 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 546 struct nfs_pathconf *info) 547 { 548 info->max_link = 0; 549 info->max_namelen = NFS2_MAXNAMLEN; 550 return 0; 551 } 552 553 static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data) 554 { 555 nfs_invalidate_atime(data->inode); 556 if (task->tk_status >= 0) { 557 nfs_refresh_inode(data->inode, data->res.fattr); 558 /* Emulate the eof flag, which isn't normally needed in NFSv2 559 * as it is guaranteed to always return the file attributes 560 */ 561 if (data->args.offset + data->args.count >= data->res.fattr->size) 562 data->res.eof = 1; 563 } 564 return 0; 565 } 566 567 static void nfs_proc_read_setup(struct nfs_read_data *data) 568 { 569 struct rpc_message msg = { 570 .rpc_proc = &nfs_procedures[NFSPROC_READ], 571 .rpc_argp = &data->args, 572 .rpc_resp = &data->res, 573 .rpc_cred = data->cred, 574 }; 575 576 rpc_call_setup(&data->task, &msg, 0); 577 } 578 579 static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data) 580 { 581 if (task->tk_status >= 0) 582 nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr); 583 return 0; 584 } 585 586 static void nfs_proc_write_setup(struct nfs_write_data *data, int how) 587 { 588 struct rpc_message msg = { 589 .rpc_proc = &nfs_procedures[NFSPROC_WRITE], 590 .rpc_argp = &data->args, 591 .rpc_resp = &data->res, 592 .rpc_cred = data->cred, 593 }; 594 595 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */ 596 data->args.stable = NFS_FILE_SYNC; 597 598 /* Finalize the task. */ 599 rpc_call_setup(&data->task, &msg, 0); 600 } 601 602 static void 603 nfs_proc_commit_setup(struct nfs_write_data *data, int how) 604 { 605 BUG(); 606 } 607 608 static int 609 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl) 610 { 611 return nlmclnt_proc(filp->f_path.dentry->d_inode, cmd, fl); 612 } 613 614 615 const struct nfs_rpc_ops nfs_v2_clientops = { 616 .version = 2, /* protocol version */ 617 .dentry_ops = &nfs_dentry_operations, 618 .dir_inode_ops = &nfs_dir_inode_operations, 619 .file_inode_ops = &nfs_file_inode_operations, 620 .getroot = nfs_proc_get_root, 621 .getattr = nfs_proc_getattr, 622 .setattr = nfs_proc_setattr, 623 .lookup = nfs_proc_lookup, 624 .access = NULL, /* access */ 625 .readlink = nfs_proc_readlink, 626 .create = nfs_proc_create, 627 .remove = nfs_proc_remove, 628 .unlink_setup = nfs_proc_unlink_setup, 629 .unlink_done = nfs_proc_unlink_done, 630 .rename = nfs_proc_rename, 631 .link = nfs_proc_link, 632 .symlink = nfs_proc_symlink, 633 .mkdir = nfs_proc_mkdir, 634 .rmdir = nfs_proc_rmdir, 635 .readdir = nfs_proc_readdir, 636 .mknod = nfs_proc_mknod, 637 .statfs = nfs_proc_statfs, 638 .fsinfo = nfs_proc_fsinfo, 639 .pathconf = nfs_proc_pathconf, 640 .decode_dirent = nfs_decode_dirent, 641 .read_setup = nfs_proc_read_setup, 642 .read_done = nfs_read_done, 643 .write_setup = nfs_proc_write_setup, 644 .write_done = nfs_write_done, 645 .commit_setup = nfs_proc_commit_setup, 646 .file_open = nfs_open, 647 .file_release = nfs_release, 648 .lock = nfs_proc_lock, 649 }; 650