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 dprintk("NFS reply setattr: %d\n", status); 118 return status; 119 } 120 121 static int 122 nfs_proc_lookup(struct inode *dir, struct qstr *name, 123 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 124 { 125 struct nfs_diropargs arg = { 126 .fh = NFS_FH(dir), 127 .name = name->name, 128 .len = name->len 129 }; 130 struct nfs_diropok res = { 131 .fh = fhandle, 132 .fattr = fattr 133 }; 134 int status; 135 136 dprintk("NFS call lookup %s\n", name->name); 137 fattr->valid = 0; 138 status = rpc_call(NFS_CLIENT(dir), NFSPROC_LOOKUP, &arg, &res, 0); 139 dprintk("NFS reply lookup: %d\n", status); 140 return status; 141 } 142 143 static int nfs_proc_readlink(struct inode *inode, struct page *page, 144 unsigned int pgbase, unsigned int pglen) 145 { 146 struct nfs_readlinkargs args = { 147 .fh = NFS_FH(inode), 148 .pgbase = pgbase, 149 .pglen = pglen, 150 .pages = &page 151 }; 152 int status; 153 154 dprintk("NFS call readlink\n"); 155 status = rpc_call(NFS_CLIENT(inode), NFSPROC_READLINK, &args, NULL, 0); 156 dprintk("NFS reply readlink: %d\n", status); 157 return status; 158 } 159 160 static int nfs_proc_read(struct nfs_read_data *rdata) 161 { 162 int flags = rdata->flags; 163 struct inode * inode = rdata->inode; 164 struct nfs_fattr * fattr = rdata->res.fattr; 165 struct rpc_message msg = { 166 .rpc_proc = &nfs_procedures[NFSPROC_READ], 167 .rpc_argp = &rdata->args, 168 .rpc_resp = &rdata->res, 169 .rpc_cred = rdata->cred, 170 }; 171 int status; 172 173 dprintk("NFS call read %d @ %Ld\n", rdata->args.count, 174 (long long) rdata->args.offset); 175 fattr->valid = 0; 176 status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags); 177 if (status >= 0) { 178 nfs_refresh_inode(inode, fattr); 179 /* Emulate the eof flag, which isn't normally needed in NFSv2 180 * as it is guaranteed to always return the file attributes 181 */ 182 if (rdata->args.offset + rdata->args.count >= fattr->size) 183 rdata->res.eof = 1; 184 } 185 dprintk("NFS reply read: %d\n", status); 186 return status; 187 } 188 189 static int nfs_proc_write(struct nfs_write_data *wdata) 190 { 191 int flags = wdata->flags; 192 struct inode * inode = wdata->inode; 193 struct nfs_fattr * fattr = wdata->res.fattr; 194 struct rpc_message msg = { 195 .rpc_proc = &nfs_procedures[NFSPROC_WRITE], 196 .rpc_argp = &wdata->args, 197 .rpc_resp = &wdata->res, 198 .rpc_cred = wdata->cred, 199 }; 200 int status; 201 202 dprintk("NFS call write %d @ %Ld\n", wdata->args.count, 203 (long long) wdata->args.offset); 204 fattr->valid = 0; 205 status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags); 206 if (status >= 0) { 207 nfs_refresh_inode(inode, fattr); 208 wdata->res.count = wdata->args.count; 209 wdata->verf.committed = NFS_FILE_SYNC; 210 } 211 dprintk("NFS reply write: %d\n", status); 212 return status < 0? status : wdata->res.count; 213 } 214 215 static int 216 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 217 int flags) 218 { 219 struct nfs_fh fhandle; 220 struct nfs_fattr fattr; 221 struct nfs_createargs arg = { 222 .fh = NFS_FH(dir), 223 .name = dentry->d_name.name, 224 .len = dentry->d_name.len, 225 .sattr = sattr 226 }; 227 struct nfs_diropok res = { 228 .fh = &fhandle, 229 .fattr = &fattr 230 }; 231 int status; 232 233 fattr.valid = 0; 234 dprintk("NFS call create %s\n", dentry->d_name.name); 235 status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0); 236 if (status == 0) 237 status = nfs_instantiate(dentry, &fhandle, &fattr); 238 dprintk("NFS reply create: %d\n", status); 239 return status; 240 } 241 242 /* 243 * In NFSv2, mknod is grafted onto the create call. 244 */ 245 static int 246 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 247 dev_t rdev) 248 { 249 struct nfs_fh fhandle; 250 struct nfs_fattr fattr; 251 struct nfs_createargs arg = { 252 .fh = NFS_FH(dir), 253 .name = dentry->d_name.name, 254 .len = dentry->d_name.len, 255 .sattr = sattr 256 }; 257 struct nfs_diropok res = { 258 .fh = &fhandle, 259 .fattr = &fattr 260 }; 261 int status, mode; 262 263 dprintk("NFS call mknod %s\n", dentry->d_name.name); 264 265 mode = sattr->ia_mode; 266 if (S_ISFIFO(mode)) { 267 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR; 268 sattr->ia_valid &= ~ATTR_SIZE; 269 } else if (S_ISCHR(mode) || S_ISBLK(mode)) { 270 sattr->ia_valid |= ATTR_SIZE; 271 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */ 272 } 273 274 fattr.valid = 0; 275 status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0); 276 277 if (status == -EINVAL && S_ISFIFO(mode)) { 278 sattr->ia_mode = mode; 279 fattr.valid = 0; 280 status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0); 281 } 282 if (status == 0) 283 status = nfs_instantiate(dentry, &fhandle, &fattr); 284 dprintk("NFS reply mknod: %d\n", status); 285 return status; 286 } 287 288 static int 289 nfs_proc_remove(struct inode *dir, struct qstr *name) 290 { 291 struct nfs_diropargs arg = { 292 .fh = NFS_FH(dir), 293 .name = name->name, 294 .len = name->len 295 }; 296 struct rpc_message msg = { 297 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE], 298 .rpc_argp = &arg, 299 .rpc_resp = NULL, 300 .rpc_cred = NULL 301 }; 302 int status; 303 304 dprintk("NFS call remove %s\n", name->name); 305 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 306 307 dprintk("NFS reply remove: %d\n", status); 308 return status; 309 } 310 311 static int 312 nfs_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name) 313 { 314 struct nfs_diropargs *arg; 315 316 arg = (struct nfs_diropargs *)kmalloc(sizeof(*arg), GFP_KERNEL); 317 if (!arg) 318 return -ENOMEM; 319 arg->fh = NFS_FH(dir->d_inode); 320 arg->name = name->name; 321 arg->len = name->len; 322 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE]; 323 msg->rpc_argp = arg; 324 return 0; 325 } 326 327 static int 328 nfs_proc_unlink_done(struct dentry *dir, struct rpc_task *task) 329 { 330 struct rpc_message *msg = &task->tk_msg; 331 332 if (msg->rpc_argp) 333 kfree(msg->rpc_argp); 334 return 0; 335 } 336 337 static int 338 nfs_proc_rename(struct inode *old_dir, struct qstr *old_name, 339 struct inode *new_dir, struct qstr *new_name) 340 { 341 struct nfs_renameargs arg = { 342 .fromfh = NFS_FH(old_dir), 343 .fromname = old_name->name, 344 .fromlen = old_name->len, 345 .tofh = NFS_FH(new_dir), 346 .toname = new_name->name, 347 .tolen = new_name->len 348 }; 349 int status; 350 351 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name); 352 status = rpc_call(NFS_CLIENT(old_dir), NFSPROC_RENAME, &arg, NULL, 0); 353 dprintk("NFS reply rename: %d\n", status); 354 return status; 355 } 356 357 static int 358 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 359 { 360 struct nfs_linkargs arg = { 361 .fromfh = NFS_FH(inode), 362 .tofh = NFS_FH(dir), 363 .toname = name->name, 364 .tolen = name->len 365 }; 366 int status; 367 368 dprintk("NFS call link %s\n", name->name); 369 status = rpc_call(NFS_CLIENT(inode), NFSPROC_LINK, &arg, NULL, 0); 370 dprintk("NFS reply link: %d\n", status); 371 return status; 372 } 373 374 static int 375 nfs_proc_symlink(struct inode *dir, struct qstr *name, struct qstr *path, 376 struct iattr *sattr, struct nfs_fh *fhandle, 377 struct nfs_fattr *fattr) 378 { 379 struct nfs_symlinkargs arg = { 380 .fromfh = NFS_FH(dir), 381 .fromname = name->name, 382 .fromlen = name->len, 383 .topath = path->name, 384 .tolen = path->len, 385 .sattr = sattr 386 }; 387 int status; 388 389 if (path->len > NFS2_MAXPATHLEN) 390 return -ENAMETOOLONG; 391 dprintk("NFS call symlink %s -> %s\n", name->name, path->name); 392 fattr->valid = 0; 393 fhandle->size = 0; 394 status = rpc_call(NFS_CLIENT(dir), NFSPROC_SYMLINK, &arg, NULL, 0); 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 int status; 415 416 dprintk("NFS call mkdir %s\n", dentry->d_name.name); 417 fattr.valid = 0; 418 status = rpc_call(NFS_CLIENT(dir), NFSPROC_MKDIR, &arg, &res, 0); 419 if (status == 0) 420 status = nfs_instantiate(dentry, &fhandle, &fattr); 421 dprintk("NFS reply mkdir: %d\n", status); 422 return status; 423 } 424 425 static int 426 nfs_proc_rmdir(struct inode *dir, struct qstr *name) 427 { 428 struct nfs_diropargs arg = { 429 .fh = NFS_FH(dir), 430 .name = name->name, 431 .len = name->len 432 }; 433 int status; 434 435 dprintk("NFS call rmdir %s\n", name->name); 436 status = rpc_call(NFS_CLIENT(dir), NFSPROC_RMDIR, &arg, NULL, 0); 437 dprintk("NFS reply rmdir: %d\n", status); 438 return status; 439 } 440 441 /* 442 * The READDIR implementation is somewhat hackish - we pass a temporary 443 * buffer to the encode function, which installs it in the receive 444 * the receive iovec. The decode function just parses the reply to make 445 * sure it is syntactically correct; the entries itself are decoded 446 * from nfs_readdir by calling the decode_entry function directly. 447 */ 448 static int 449 nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 450 u64 cookie, struct page *page, unsigned int count, int plus) 451 { 452 struct inode *dir = dentry->d_inode; 453 struct nfs_readdirargs arg = { 454 .fh = NFS_FH(dir), 455 .cookie = cookie, 456 .count = count, 457 .pages = &page 458 }; 459 struct rpc_message msg = { 460 .rpc_proc = &nfs_procedures[NFSPROC_READDIR], 461 .rpc_argp = &arg, 462 .rpc_resp = NULL, 463 .rpc_cred = cred 464 }; 465 int status; 466 467 lock_kernel(); 468 469 dprintk("NFS call readdir %d\n", (unsigned int)cookie); 470 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 471 472 dprintk("NFS reply readdir: %d\n", status); 473 unlock_kernel(); 474 return status; 475 } 476 477 static int 478 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 479 struct nfs_fsstat *stat) 480 { 481 struct nfs2_fsstat fsinfo; 482 int status; 483 484 dprintk("NFS call statfs\n"); 485 stat->fattr->valid = 0; 486 status = rpc_call(server->client, NFSPROC_STATFS, fhandle, &fsinfo, 0); 487 dprintk("NFS reply statfs: %d\n", status); 488 if (status) 489 goto out; 490 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize; 491 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize; 492 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize; 493 stat->tfiles = 0; 494 stat->ffiles = 0; 495 stat->afiles = 0; 496 out: 497 return status; 498 } 499 500 static int 501 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 502 struct nfs_fsinfo *info) 503 { 504 struct nfs2_fsstat fsinfo; 505 int status; 506 507 dprintk("NFS call fsinfo\n"); 508 info->fattr->valid = 0; 509 status = rpc_call(server->client, NFSPROC_STATFS, fhandle, &fsinfo, 0); 510 dprintk("NFS reply fsinfo: %d\n", status); 511 if (status) 512 goto out; 513 info->rtmax = NFS_MAXDATA; 514 info->rtpref = fsinfo.tsize; 515 info->rtmult = fsinfo.bsize; 516 info->wtmax = NFS_MAXDATA; 517 info->wtpref = fsinfo.tsize; 518 info->wtmult = fsinfo.bsize; 519 info->dtpref = fsinfo.tsize; 520 info->maxfilesize = 0x7FFFFFFF; 521 info->lease_time = 0; 522 out: 523 return status; 524 } 525 526 static int 527 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 528 struct nfs_pathconf *info) 529 { 530 info->max_link = 0; 531 info->max_namelen = NFS2_MAXNAMLEN; 532 return 0; 533 } 534 535 extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int); 536 537 static void 538 nfs_read_done(struct rpc_task *task) 539 { 540 struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata; 541 542 if (task->tk_status >= 0) { 543 nfs_refresh_inode(data->inode, data->res.fattr); 544 /* Emulate the eof flag, which isn't normally needed in NFSv2 545 * as it is guaranteed to always return the file attributes 546 */ 547 if (data->args.offset + data->args.count >= data->res.fattr->size) 548 data->res.eof = 1; 549 } 550 nfs_readpage_result(task); 551 } 552 553 static void 554 nfs_proc_read_setup(struct nfs_read_data *data) 555 { 556 struct rpc_task *task = &data->task; 557 struct inode *inode = data->inode; 558 int flags; 559 struct rpc_message msg = { 560 .rpc_proc = &nfs_procedures[NFSPROC_READ], 561 .rpc_argp = &data->args, 562 .rpc_resp = &data->res, 563 .rpc_cred = data->cred, 564 }; 565 566 /* N.B. Do we need to test? Never called for swapfile inode */ 567 flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0); 568 569 /* Finalize the task. */ 570 rpc_init_task(task, NFS_CLIENT(inode), nfs_read_done, flags); 571 rpc_call_setup(task, &msg, 0); 572 } 573 574 static void 575 nfs_write_done(struct rpc_task *task) 576 { 577 struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata; 578 579 if (task->tk_status >= 0) 580 nfs_refresh_inode(data->inode, data->res.fattr); 581 nfs_writeback_done(task); 582 } 583 584 static void 585 nfs_proc_write_setup(struct nfs_write_data *data, int how) 586 { 587 struct rpc_task *task = &data->task; 588 struct inode *inode = data->inode; 589 int flags; 590 struct rpc_message msg = { 591 .rpc_proc = &nfs_procedures[NFSPROC_WRITE], 592 .rpc_argp = &data->args, 593 .rpc_resp = &data->res, 594 .rpc_cred = data->cred, 595 }; 596 597 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */ 598 data->args.stable = NFS_FILE_SYNC; 599 600 /* Set the initial flags for the task. */ 601 flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 602 603 /* Finalize the task. */ 604 rpc_init_task(task, NFS_CLIENT(inode), nfs_write_done, flags); 605 rpc_call_setup(task, &msg, 0); 606 } 607 608 static void 609 nfs_proc_commit_setup(struct nfs_write_data *data, int how) 610 { 611 BUG(); 612 } 613 614 static int 615 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl) 616 { 617 return nlmclnt_proc(filp->f_dentry->d_inode, cmd, fl); 618 } 619 620 621 struct nfs_rpc_ops nfs_v2_clientops = { 622 .version = 2, /* protocol version */ 623 .dentry_ops = &nfs_dentry_operations, 624 .dir_inode_ops = &nfs_dir_inode_operations, 625 .file_inode_ops = &nfs_file_inode_operations, 626 .getroot = nfs_proc_get_root, 627 .getattr = nfs_proc_getattr, 628 .setattr = nfs_proc_setattr, 629 .lookup = nfs_proc_lookup, 630 .access = NULL, /* access */ 631 .readlink = nfs_proc_readlink, 632 .read = nfs_proc_read, 633 .write = nfs_proc_write, 634 .commit = NULL, /* commit */ 635 .create = nfs_proc_create, 636 .remove = nfs_proc_remove, 637 .unlink_setup = nfs_proc_unlink_setup, 638 .unlink_done = nfs_proc_unlink_done, 639 .rename = nfs_proc_rename, 640 .link = nfs_proc_link, 641 .symlink = nfs_proc_symlink, 642 .mkdir = nfs_proc_mkdir, 643 .rmdir = nfs_proc_rmdir, 644 .readdir = nfs_proc_readdir, 645 .mknod = nfs_proc_mknod, 646 .statfs = nfs_proc_statfs, 647 .fsinfo = nfs_proc_fsinfo, 648 .pathconf = nfs_proc_pathconf, 649 .decode_dirent = nfs_decode_dirent, 650 .read_setup = nfs_proc_read_setup, 651 .write_setup = nfs_proc_write_setup, 652 .commit_setup = nfs_proc_commit_setup, 653 .file_open = nfs_open, 654 .file_release = nfs_release, 655 .lock = nfs_proc_lock, 656 }; 657