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 <linux/smp_lock.h> 47 48 #define NFSDBG_FACILITY NFSDBG_PROC 49 50 extern struct rpc_procinfo nfs_procedures[]; 51 52 /* 53 * Bare-bones access to getattr: this is for nfs_read_super. 54 */ 55 static int 56 nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle, 57 struct nfs_fsinfo *info) 58 { 59 struct nfs_fattr *fattr = info->fattr; 60 struct nfs2_fsstat fsinfo; 61 int status; 62 63 dprintk("%s: call getattr\n", __FUNCTION__); 64 fattr->valid = 0; 65 status = rpc_call(server->client_sys, NFSPROC_GETATTR, fhandle, fattr, 0); 66 dprintk("%s: reply getattr: %d\n", __FUNCTION__, status); 67 if (status) 68 return status; 69 dprintk("%s: call statfs\n", __FUNCTION__); 70 status = rpc_call(server->client_sys, NFSPROC_STATFS, fhandle, &fsinfo, 0); 71 dprintk("%s: reply statfs: %d\n", __FUNCTION__, status); 72 if (status) 73 return status; 74 info->rtmax = NFS_MAXDATA; 75 info->rtpref = fsinfo.tsize; 76 info->rtmult = fsinfo.bsize; 77 info->wtmax = NFS_MAXDATA; 78 info->wtpref = fsinfo.tsize; 79 info->wtmult = fsinfo.bsize; 80 info->dtpref = fsinfo.tsize; 81 info->maxfilesize = 0x7FFFFFFF; 82 info->lease_time = 0; 83 return 0; 84 } 85 86 /* 87 * One function for each procedure in the NFS protocol. 88 */ 89 static int 90 nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 91 struct nfs_fattr *fattr) 92 { 93 int status; 94 95 dprintk("NFS call getattr\n"); 96 fattr->valid = 0; 97 status = rpc_call(server->client, NFSPROC_GETATTR, 98 fhandle, fattr, 0); 99 dprintk("NFS reply getattr: %d\n", status); 100 return status; 101 } 102 103 static int 104 nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 105 struct iattr *sattr) 106 { 107 struct inode *inode = dentry->d_inode; 108 struct nfs_sattrargs arg = { 109 .fh = NFS_FH(inode), 110 .sattr = sattr 111 }; 112 int status; 113 114 dprintk("NFS call setattr\n"); 115 fattr->valid = 0; 116 status = rpc_call(NFS_CLIENT(inode), NFSPROC_SETATTR, &arg, fattr, 0); 117 if (status == 0) 118 nfs_setattr_update_inode(inode, sattr); 119 dprintk("NFS reply setattr: %d\n", status); 120 return status; 121 } 122 123 static int 124 nfs_proc_lookup(struct inode *dir, struct qstr *name, 125 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 126 { 127 struct nfs_diropargs arg = { 128 .fh = NFS_FH(dir), 129 .name = name->name, 130 .len = name->len 131 }; 132 struct nfs_diropok res = { 133 .fh = fhandle, 134 .fattr = fattr 135 }; 136 int status; 137 138 dprintk("NFS call lookup %s\n", name->name); 139 fattr->valid = 0; 140 status = rpc_call(NFS_CLIENT(dir), NFSPROC_LOOKUP, &arg, &res, 0); 141 dprintk("NFS reply lookup: %d\n", status); 142 return status; 143 } 144 145 static int nfs_proc_readlink(struct inode *inode, struct page *page, 146 unsigned int pgbase, unsigned int pglen) 147 { 148 struct nfs_readlinkargs args = { 149 .fh = NFS_FH(inode), 150 .pgbase = pgbase, 151 .pglen = pglen, 152 .pages = &page 153 }; 154 int status; 155 156 dprintk("NFS call readlink\n"); 157 status = rpc_call(NFS_CLIENT(inode), NFSPROC_READLINK, &args, NULL, 0); 158 dprintk("NFS reply readlink: %d\n", status); 159 return status; 160 } 161 162 static int nfs_proc_read(struct nfs_read_data *rdata) 163 { 164 int flags = rdata->flags; 165 struct inode * inode = rdata->inode; 166 struct nfs_fattr * fattr = rdata->res.fattr; 167 struct rpc_message msg = { 168 .rpc_proc = &nfs_procedures[NFSPROC_READ], 169 .rpc_argp = &rdata->args, 170 .rpc_resp = &rdata->res, 171 .rpc_cred = rdata->cred, 172 }; 173 int status; 174 175 dprintk("NFS call read %d @ %Ld\n", rdata->args.count, 176 (long long) rdata->args.offset); 177 fattr->valid = 0; 178 status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags); 179 if (status >= 0) { 180 nfs_refresh_inode(inode, fattr); 181 /* Emulate the eof flag, which isn't normally needed in NFSv2 182 * as it is guaranteed to always return the file attributes 183 */ 184 if (rdata->args.offset + rdata->args.count >= fattr->size) 185 rdata->res.eof = 1; 186 } 187 dprintk("NFS reply read: %d\n", status); 188 return status; 189 } 190 191 static int nfs_proc_write(struct nfs_write_data *wdata) 192 { 193 int flags = wdata->flags; 194 struct inode * inode = wdata->inode; 195 struct nfs_fattr * fattr = wdata->res.fattr; 196 struct rpc_message msg = { 197 .rpc_proc = &nfs_procedures[NFSPROC_WRITE], 198 .rpc_argp = &wdata->args, 199 .rpc_resp = &wdata->res, 200 .rpc_cred = wdata->cred, 201 }; 202 int status; 203 204 dprintk("NFS call write %d @ %Ld\n", wdata->args.count, 205 (long long) wdata->args.offset); 206 fattr->valid = 0; 207 status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags); 208 if (status >= 0) { 209 nfs_refresh_inode(inode, fattr); 210 wdata->res.count = wdata->args.count; 211 wdata->verf.committed = NFS_FILE_SYNC; 212 } 213 dprintk("NFS reply write: %d\n", status); 214 return status < 0? status : wdata->res.count; 215 } 216 217 static int 218 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 219 int flags) 220 { 221 struct nfs_fh fhandle; 222 struct nfs_fattr fattr; 223 struct nfs_createargs arg = { 224 .fh = NFS_FH(dir), 225 .name = dentry->d_name.name, 226 .len = dentry->d_name.len, 227 .sattr = sattr 228 }; 229 struct nfs_diropok res = { 230 .fh = &fhandle, 231 .fattr = &fattr 232 }; 233 int status; 234 235 fattr.valid = 0; 236 dprintk("NFS call create %s\n", dentry->d_name.name); 237 status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0); 238 if (status == 0) 239 status = nfs_instantiate(dentry, &fhandle, &fattr); 240 dprintk("NFS reply create: %d\n", status); 241 return status; 242 } 243 244 /* 245 * In NFSv2, mknod is grafted onto the create call. 246 */ 247 static int 248 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 249 dev_t rdev) 250 { 251 struct nfs_fh fhandle; 252 struct nfs_fattr fattr; 253 struct nfs_createargs arg = { 254 .fh = NFS_FH(dir), 255 .name = dentry->d_name.name, 256 .len = dentry->d_name.len, 257 .sattr = sattr 258 }; 259 struct nfs_diropok res = { 260 .fh = &fhandle, 261 .fattr = &fattr 262 }; 263 int status, mode; 264 265 dprintk("NFS call mknod %s\n", dentry->d_name.name); 266 267 mode = sattr->ia_mode; 268 if (S_ISFIFO(mode)) { 269 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR; 270 sattr->ia_valid &= ~ATTR_SIZE; 271 } else if (S_ISCHR(mode) || S_ISBLK(mode)) { 272 sattr->ia_valid |= ATTR_SIZE; 273 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */ 274 } 275 276 fattr.valid = 0; 277 status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0); 278 279 if (status == -EINVAL && S_ISFIFO(mode)) { 280 sattr->ia_mode = mode; 281 fattr.valid = 0; 282 status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0); 283 } 284 if (status == 0) 285 status = nfs_instantiate(dentry, &fhandle, &fattr); 286 dprintk("NFS reply mknod: %d\n", status); 287 return status; 288 } 289 290 static int 291 nfs_proc_remove(struct inode *dir, struct qstr *name) 292 { 293 struct nfs_diropargs arg = { 294 .fh = NFS_FH(dir), 295 .name = name->name, 296 .len = name->len 297 }; 298 struct rpc_message msg = { 299 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE], 300 .rpc_argp = &arg, 301 .rpc_resp = NULL, 302 .rpc_cred = NULL 303 }; 304 int status; 305 306 dprintk("NFS call remove %s\n", name->name); 307 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 308 309 dprintk("NFS reply remove: %d\n", status); 310 return status; 311 } 312 313 static int 314 nfs_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name) 315 { 316 struct nfs_diropargs *arg; 317 318 arg = (struct nfs_diropargs *)kmalloc(sizeof(*arg), GFP_KERNEL); 319 if (!arg) 320 return -ENOMEM; 321 arg->fh = NFS_FH(dir->d_inode); 322 arg->name = name->name; 323 arg->len = name->len; 324 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE]; 325 msg->rpc_argp = arg; 326 return 0; 327 } 328 329 static int 330 nfs_proc_unlink_done(struct dentry *dir, struct rpc_task *task) 331 { 332 struct rpc_message *msg = &task->tk_msg; 333 334 if (msg->rpc_argp) 335 kfree(msg->rpc_argp); 336 return 0; 337 } 338 339 static int 340 nfs_proc_rename(struct inode *old_dir, struct qstr *old_name, 341 struct inode *new_dir, struct qstr *new_name) 342 { 343 struct nfs_renameargs arg = { 344 .fromfh = NFS_FH(old_dir), 345 .fromname = old_name->name, 346 .fromlen = old_name->len, 347 .tofh = NFS_FH(new_dir), 348 .toname = new_name->name, 349 .tolen = new_name->len 350 }; 351 int status; 352 353 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name); 354 status = rpc_call(NFS_CLIENT(old_dir), NFSPROC_RENAME, &arg, NULL, 0); 355 dprintk("NFS reply rename: %d\n", status); 356 return status; 357 } 358 359 static int 360 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 361 { 362 struct nfs_linkargs arg = { 363 .fromfh = NFS_FH(inode), 364 .tofh = NFS_FH(dir), 365 .toname = name->name, 366 .tolen = name->len 367 }; 368 int status; 369 370 dprintk("NFS call link %s\n", name->name); 371 status = rpc_call(NFS_CLIENT(inode), NFSPROC_LINK, &arg, NULL, 0); 372 dprintk("NFS reply link: %d\n", status); 373 return status; 374 } 375 376 static int 377 nfs_proc_symlink(struct inode *dir, struct qstr *name, struct qstr *path, 378 struct iattr *sattr, struct nfs_fh *fhandle, 379 struct nfs_fattr *fattr) 380 { 381 struct nfs_symlinkargs arg = { 382 .fromfh = NFS_FH(dir), 383 .fromname = name->name, 384 .fromlen = name->len, 385 .topath = path->name, 386 .tolen = path->len, 387 .sattr = sattr 388 }; 389 int status; 390 391 if (path->len > NFS2_MAXPATHLEN) 392 return -ENAMETOOLONG; 393 dprintk("NFS call symlink %s -> %s\n", name->name, path->name); 394 fattr->valid = 0; 395 fhandle->size = 0; 396 status = rpc_call(NFS_CLIENT(dir), NFSPROC_SYMLINK, &arg, NULL, 0); 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 int status; 417 418 dprintk("NFS call mkdir %s\n", dentry->d_name.name); 419 fattr.valid = 0; 420 status = rpc_call(NFS_CLIENT(dir), NFSPROC_MKDIR, &arg, &res, 0); 421 if (status == 0) 422 status = nfs_instantiate(dentry, &fhandle, &fattr); 423 dprintk("NFS reply mkdir: %d\n", status); 424 return status; 425 } 426 427 static int 428 nfs_proc_rmdir(struct inode *dir, struct qstr *name) 429 { 430 struct nfs_diropargs arg = { 431 .fh = NFS_FH(dir), 432 .name = name->name, 433 .len = name->len 434 }; 435 int status; 436 437 dprintk("NFS call rmdir %s\n", name->name); 438 status = rpc_call(NFS_CLIENT(dir), NFSPROC_RMDIR, &arg, NULL, 0); 439 dprintk("NFS reply rmdir: %d\n", status); 440 return status; 441 } 442 443 /* 444 * The READDIR implementation is somewhat hackish - we pass a temporary 445 * buffer to the encode function, which installs it in the receive 446 * the receive iovec. The decode function just parses the reply to make 447 * sure it is syntactically correct; the entries itself are decoded 448 * from nfs_readdir by calling the decode_entry function directly. 449 */ 450 static int 451 nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 452 u64 cookie, struct page *page, unsigned int count, int plus) 453 { 454 struct inode *dir = dentry->d_inode; 455 struct nfs_readdirargs arg = { 456 .fh = NFS_FH(dir), 457 .cookie = cookie, 458 .count = count, 459 .pages = &page 460 }; 461 struct rpc_message msg = { 462 .rpc_proc = &nfs_procedures[NFSPROC_READDIR], 463 .rpc_argp = &arg, 464 .rpc_resp = NULL, 465 .rpc_cred = cred 466 }; 467 int status; 468 469 lock_kernel(); 470 471 dprintk("NFS call readdir %d\n", (unsigned int)cookie); 472 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 473 474 dprintk("NFS reply readdir: %d\n", status); 475 unlock_kernel(); 476 return status; 477 } 478 479 static int 480 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 481 struct nfs_fsstat *stat) 482 { 483 struct nfs2_fsstat fsinfo; 484 int status; 485 486 dprintk("NFS call statfs\n"); 487 stat->fattr->valid = 0; 488 status = rpc_call(server->client, NFSPROC_STATFS, fhandle, &fsinfo, 0); 489 dprintk("NFS reply statfs: %d\n", status); 490 if (status) 491 goto out; 492 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize; 493 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize; 494 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize; 495 stat->tfiles = 0; 496 stat->ffiles = 0; 497 stat->afiles = 0; 498 out: 499 return status; 500 } 501 502 static int 503 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 504 struct nfs_fsinfo *info) 505 { 506 struct nfs2_fsstat fsinfo; 507 int status; 508 509 dprintk("NFS call fsinfo\n"); 510 info->fattr->valid = 0; 511 status = rpc_call(server->client, NFSPROC_STATFS, fhandle, &fsinfo, 0); 512 dprintk("NFS reply fsinfo: %d\n", status); 513 if (status) 514 goto out; 515 info->rtmax = NFS_MAXDATA; 516 info->rtpref = fsinfo.tsize; 517 info->rtmult = fsinfo.bsize; 518 info->wtmax = NFS_MAXDATA; 519 info->wtpref = fsinfo.tsize; 520 info->wtmult = fsinfo.bsize; 521 info->dtpref = fsinfo.tsize; 522 info->maxfilesize = 0x7FFFFFFF; 523 info->lease_time = 0; 524 out: 525 return status; 526 } 527 528 static int 529 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 530 struct nfs_pathconf *info) 531 { 532 info->max_link = 0; 533 info->max_namelen = NFS2_MAXNAMLEN; 534 return 0; 535 } 536 537 extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int); 538 539 static void 540 nfs_read_done(struct rpc_task *task) 541 { 542 struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata; 543 544 if (task->tk_status >= 0) { 545 nfs_refresh_inode(data->inode, data->res.fattr); 546 /* Emulate the eof flag, which isn't normally needed in NFSv2 547 * as it is guaranteed to always return the file attributes 548 */ 549 if (data->args.offset + data->args.count >= data->res.fattr->size) 550 data->res.eof = 1; 551 } 552 nfs_readpage_result(task); 553 } 554 555 static void 556 nfs_proc_read_setup(struct nfs_read_data *data) 557 { 558 struct rpc_task *task = &data->task; 559 struct inode *inode = data->inode; 560 int flags; 561 struct rpc_message msg = { 562 .rpc_proc = &nfs_procedures[NFSPROC_READ], 563 .rpc_argp = &data->args, 564 .rpc_resp = &data->res, 565 .rpc_cred = data->cred, 566 }; 567 568 /* N.B. Do we need to test? Never called for swapfile inode */ 569 flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0); 570 571 /* Finalize the task. */ 572 rpc_init_task(task, NFS_CLIENT(inode), nfs_read_done, flags); 573 rpc_call_setup(task, &msg, 0); 574 } 575 576 static void 577 nfs_write_done(struct rpc_task *task) 578 { 579 struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata; 580 581 if (task->tk_status >= 0) 582 nfs_refresh_inode(data->inode, data->res.fattr); 583 nfs_writeback_done(task); 584 } 585 586 static void 587 nfs_proc_write_setup(struct nfs_write_data *data, int how) 588 { 589 struct rpc_task *task = &data->task; 590 struct inode *inode = data->inode; 591 int flags; 592 struct rpc_message msg = { 593 .rpc_proc = &nfs_procedures[NFSPROC_WRITE], 594 .rpc_argp = &data->args, 595 .rpc_resp = &data->res, 596 .rpc_cred = data->cred, 597 }; 598 599 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */ 600 data->args.stable = NFS_FILE_SYNC; 601 602 /* Set the initial flags for the task. */ 603 flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 604 605 /* Finalize the task. */ 606 rpc_init_task(task, NFS_CLIENT(inode), nfs_write_done, flags); 607 rpc_call_setup(task, &msg, 0); 608 } 609 610 static void 611 nfs_proc_commit_setup(struct nfs_write_data *data, int how) 612 { 613 BUG(); 614 } 615 616 static int 617 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl) 618 { 619 return nlmclnt_proc(filp->f_dentry->d_inode, cmd, fl); 620 } 621 622 623 struct nfs_rpc_ops nfs_v2_clientops = { 624 .version = 2, /* protocol version */ 625 .dentry_ops = &nfs_dentry_operations, 626 .dir_inode_ops = &nfs_dir_inode_operations, 627 .file_inode_ops = &nfs_file_inode_operations, 628 .getroot = nfs_proc_get_root, 629 .getattr = nfs_proc_getattr, 630 .setattr = nfs_proc_setattr, 631 .lookup = nfs_proc_lookup, 632 .access = NULL, /* access */ 633 .readlink = nfs_proc_readlink, 634 .read = nfs_proc_read, 635 .write = nfs_proc_write, 636 .commit = NULL, /* commit */ 637 .create = nfs_proc_create, 638 .remove = nfs_proc_remove, 639 .unlink_setup = nfs_proc_unlink_setup, 640 .unlink_done = nfs_proc_unlink_done, 641 .rename = nfs_proc_rename, 642 .link = nfs_proc_link, 643 .symlink = nfs_proc_symlink, 644 .mkdir = nfs_proc_mkdir, 645 .rmdir = nfs_proc_rmdir, 646 .readdir = nfs_proc_readdir, 647 .mknod = nfs_proc_mknod, 648 .statfs = nfs_proc_statfs, 649 .fsinfo = nfs_proc_fsinfo, 650 .pathconf = nfs_proc_pathconf, 651 .decode_dirent = nfs_decode_dirent, 652 .read_setup = nfs_proc_read_setup, 653 .write_setup = nfs_proc_write_setup, 654 .commit_setup = nfs_proc_commit_setup, 655 .file_open = nfs_open, 656 .file_release = nfs_release, 657 .lock = nfs_proc_lock, 658 }; 659