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