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 */ 53static int 54nfs_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 */ 94static int 95nfs_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 112static int 113nfs_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 140static int 141nfs_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 167static 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 188static int 189nfs_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 */ 223static int 224nfs_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 272static int 273nfs_proc_remove(struct inode *dir, struct qstr *name) 274{ 275 struct nfs_diropargs arg = { 276 .fh = NFS_FH(dir), 277 .name = name->name, 278 .len = name->len 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 294static int 295nfs_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name) 296{ 297 struct nfs_diropargs *arg; 298 299 arg = kmalloc(sizeof(*arg), GFP_KERNEL); 300 if (!arg) 301 return -ENOMEM; 302 arg->fh = NFS_FH(dir->d_inode); 303 arg->name = name->name; 304 arg->len = name->len; 305 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE]; 306 msg->rpc_argp = arg; 307 return 0; 308} 309 310static int 311nfs_proc_unlink_done(struct dentry *dir, struct rpc_task *task) 312{ 313 struct rpc_message *msg = &task->tk_msg; 314 315 if (msg->rpc_argp) { 316 nfs_mark_for_revalidate(dir->d_inode); 317 kfree(msg->rpc_argp); 318 } 319 return 0; 320} 321 322static int 323nfs_proc_rename(struct inode *old_dir, struct qstr *old_name, 324 struct inode *new_dir, struct qstr *new_name) 325{ 326 struct nfs_renameargs arg = { 327 .fromfh = NFS_FH(old_dir), 328 .fromname = old_name->name, 329 .fromlen = old_name->len, 330 .tofh = NFS_FH(new_dir), 331 .toname = new_name->name, 332 .tolen = new_name->len 333 }; 334 struct rpc_message msg = { 335 .rpc_proc = &nfs_procedures[NFSPROC_RENAME], 336 .rpc_argp = &arg, 337 }; 338 int status; 339 340 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name); 341 status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0); 342 nfs_mark_for_revalidate(old_dir); 343 nfs_mark_for_revalidate(new_dir); 344 dprintk("NFS reply rename: %d\n", status); 345 return status; 346} 347 348static int 349nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 350{ 351 struct nfs_linkargs arg = { 352 .fromfh = NFS_FH(inode), 353 .tofh = NFS_FH(dir), 354 .toname = name->name, 355 .tolen = name->len 356 }; 357 struct rpc_message msg = { 358 .rpc_proc = &nfs_procedures[NFSPROC_LINK], 359 .rpc_argp = &arg, 360 }; 361 int status; 362 363 dprintk("NFS call link %s\n", name->name); 364 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 365 nfs_mark_for_revalidate(inode); 366 nfs_mark_for_revalidate(dir); 367 dprintk("NFS reply link: %d\n", status); 368 return status; 369} 370 371static int 372nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page, 373 unsigned int len, struct iattr *sattr) 374{ 375 struct nfs_fh fhandle; 376 struct nfs_fattr fattr; 377 struct nfs_symlinkargs arg = { 378 .fromfh = NFS_FH(dir), 379 .fromname = dentry->d_name.name, 380 .fromlen = dentry->d_name.len, 381 .pages = &page, 382 .pathlen = len, 383 .sattr = sattr 384 }; 385 struct rpc_message msg = { 386 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK], 387 .rpc_argp = &arg, 388 }; 389 int status; 390 391 if (len > NFS2_MAXPATHLEN) 392 return -ENAMETOOLONG; 393 394 dprintk("NFS call symlink %s\n", dentry->d_name.name); 395 396 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 397 nfs_mark_for_revalidate(dir); 398 399 /* 400 * V2 SYMLINK requests don't return any attributes. Setting the 401 * filehandle size to zero indicates to nfs_instantiate that it 402 * should fill in the data with a LOOKUP call on the wire. 403 */ 404 if (status == 0) { 405 nfs_fattr_init(&fattr); 406 fhandle.size = 0; 407 status = nfs_instantiate(dentry, &fhandle, &fattr); 408 } 409 410 dprintk("NFS reply symlink: %d\n", status); 411 return status; 412} 413 414static int 415nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr) 416{ 417 struct nfs_fh fhandle; 418 struct nfs_fattr fattr; 419 struct nfs_createargs arg = { 420 .fh = NFS_FH(dir), 421 .name = dentry->d_name.name, 422 .len = dentry->d_name.len, 423 .sattr = sattr 424 }; 425 struct nfs_diropok res = { 426 .fh = &fhandle, 427 .fattr = &fattr 428 }; 429 struct rpc_message msg = { 430 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR], 431 .rpc_argp = &arg, 432 .rpc_resp = &res, 433 }; 434 int status; 435 436 dprintk("NFS call mkdir %s\n", dentry->d_name.name); 437 nfs_fattr_init(&fattr); 438 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 439 nfs_mark_for_revalidate(dir); 440 if (status == 0) 441 status = nfs_instantiate(dentry, &fhandle, &fattr); 442 dprintk("NFS reply mkdir: %d\n", status); 443 return status; 444} 445 446static int 447nfs_proc_rmdir(struct inode *dir, struct qstr *name) 448{ 449 struct nfs_diropargs arg = { 450 .fh = NFS_FH(dir), 451 .name = name->name, 452 .len = name->len 453 }; 454 struct rpc_message msg = { 455 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR], 456 .rpc_argp = &arg, 457 }; 458 int status; 459 460 dprintk("NFS call rmdir %s\n", name->name); 461 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 462 nfs_mark_for_revalidate(dir); 463 dprintk("NFS reply rmdir: %d\n", status); 464 return status; 465} 466 467/* 468 * The READDIR implementation is somewhat hackish - we pass a temporary 469 * buffer to the encode function, which installs it in the receive 470 * the receive iovec. The decode function just parses the reply to make 471 * sure it is syntactically correct; the entries itself are decoded 472 * from nfs_readdir by calling the decode_entry function directly. 473 */ 474static int 475nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 476 u64 cookie, struct page *page, unsigned int count, int plus) 477{ 478 struct inode *dir = dentry->d_inode; 479 struct nfs_readdirargs arg = { 480 .fh = NFS_FH(dir), 481 .cookie = cookie, 482 .count = count, 483 .pages = &page, 484 }; 485 struct rpc_message msg = { 486 .rpc_proc = &nfs_procedures[NFSPROC_READDIR], 487 .rpc_argp = &arg, 488 .rpc_cred = cred, 489 }; 490 int status; 491 492 dprintk("NFS call readdir %d\n", (unsigned int)cookie); 493 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 494 495 dprintk("NFS reply readdir: %d\n", status); 496 return status; 497} 498 499static int 500nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 501 struct nfs_fsstat *stat) 502{ 503 struct nfs2_fsstat fsinfo; 504 struct rpc_message msg = { 505 .rpc_proc = &nfs_procedures[NFSPROC_STATFS], 506 .rpc_argp = fhandle, 507 .rpc_resp = &fsinfo, 508 }; 509 int status; 510 511 dprintk("NFS call statfs\n"); 512 nfs_fattr_init(stat->fattr); 513 status = rpc_call_sync(server->client, &msg, 0); 514 dprintk("NFS reply statfs: %d\n", status); 515 if (status) 516 goto out; 517 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize; 518 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize; 519 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize; 520 stat->tfiles = 0; 521 stat->ffiles = 0; 522 stat->afiles = 0; 523out: 524 return status; 525} 526 527static int 528nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 529 struct nfs_fsinfo *info) 530{ 531 struct nfs2_fsstat fsinfo; 532 struct rpc_message msg = { 533 .rpc_proc = &nfs_procedures[NFSPROC_STATFS], 534 .rpc_argp = fhandle, 535 .rpc_resp = &fsinfo, 536 }; 537 int status; 538 539 dprintk("NFS call fsinfo\n"); 540 nfs_fattr_init(info->fattr); 541 status = rpc_call_sync(server->client, &msg, 0); 542 dprintk("NFS reply fsinfo: %d\n", status); 543 if (status) 544 goto out; 545 info->rtmax = NFS_MAXDATA; 546 info->rtpref = fsinfo.tsize; 547 info->rtmult = fsinfo.bsize; 548 info->wtmax = NFS_MAXDATA; 549 info->wtpref = fsinfo.tsize; 550 info->wtmult = fsinfo.bsize; 551 info->dtpref = fsinfo.tsize; 552 info->maxfilesize = 0x7FFFFFFF; 553 info->lease_time = 0; 554out: 555 return status; 556} 557 558static int 559nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 560 struct nfs_pathconf *info) 561{ 562 info->max_link = 0; 563 info->max_namelen = NFS2_MAXNAMLEN; 564 return 0; 565} 566 567static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data) 568{ 569 if (task->tk_status >= 0) { 570 nfs_refresh_inode(data->inode, data->res.fattr); 571 /* Emulate the eof flag, which isn't normally needed in NFSv2 572 * as it is guaranteed to always return the file attributes 573 */ 574 if (data->args.offset + data->args.count >= data->res.fattr->size) 575 data->res.eof = 1; 576 } 577 return 0; 578} 579 580static void nfs_proc_read_setup(struct nfs_read_data *data) 581{ 582 struct rpc_message msg = { 583 .rpc_proc = &nfs_procedures[NFSPROC_READ], 584 .rpc_argp = &data->args, 585 .rpc_resp = &data->res, 586 .rpc_cred = data->cred, 587 }; 588 589 rpc_call_setup(&data->task, &msg, 0); 590} 591 592static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data) 593{ 594 if (task->tk_status >= 0) 595 nfs_post_op_update_inode(data->inode, data->res.fattr); 596 return 0; 597} 598 599static void nfs_proc_write_setup(struct nfs_write_data *data, int how) 600{ 601 struct rpc_message msg = { 602 .rpc_proc = &nfs_procedures[NFSPROC_WRITE], 603 .rpc_argp = &data->args, 604 .rpc_resp = &data->res, 605 .rpc_cred = data->cred, 606 }; 607 608 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */ 609 data->args.stable = NFS_FILE_SYNC; 610 611 /* Finalize the task. */ 612 rpc_call_setup(&data->task, &msg, 0); 613} 614 615static void 616nfs_proc_commit_setup(struct nfs_write_data *data, int how) 617{ 618 BUG(); 619} 620 621static int 622nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl) 623{ 624 return nlmclnt_proc(filp->f_path.dentry->d_inode, cmd, fl); 625} 626 627 628const struct nfs_rpc_ops nfs_v2_clientops = { 629 .version = 2, /* protocol version */ 630 .dentry_ops = &nfs_dentry_operations, 631 .dir_inode_ops = &nfs_dir_inode_operations, 632 .file_inode_ops = &nfs_file_inode_operations, 633 .getroot = nfs_proc_get_root, 634 .getattr = nfs_proc_getattr, 635 .setattr = nfs_proc_setattr, 636 .lookup = nfs_proc_lookup, 637 .access = NULL, /* access */ 638 .readlink = nfs_proc_readlink, 639 .create = nfs_proc_create, 640 .remove = nfs_proc_remove, 641 .unlink_setup = nfs_proc_unlink_setup, 642 .unlink_done = nfs_proc_unlink_done, 643 .rename = nfs_proc_rename, 644 .link = nfs_proc_link, 645 .symlink = nfs_proc_symlink, 646 .mkdir = nfs_proc_mkdir, 647 .rmdir = nfs_proc_rmdir, 648 .readdir = nfs_proc_readdir, 649 .mknod = nfs_proc_mknod, 650 .statfs = nfs_proc_statfs, 651 .fsinfo = nfs_proc_fsinfo, 652 .pathconf = nfs_proc_pathconf, 653 .decode_dirent = nfs_decode_dirent, 654 .read_setup = nfs_proc_read_setup, 655 .read_done = nfs_read_done, 656 .write_setup = nfs_proc_write_setup, 657 .write_done = nfs_write_done, 658 .commit_setup = nfs_proc_commit_setup, 659 .file_open = nfs_open, 660 .file_release = nfs_release, 661 .lock = nfs_proc_lock, 662}; 663