1 /* 2 * fs/nfsd/nfs4proc.c 3 * 4 * Server-side procedures for NFSv4. 5 * 6 * Copyright (c) 2002 The Regents of the University of Michigan. 7 * All rights reserved. 8 * 9 * Kendrick Smith <kmsmith@umich.edu> 10 * Andy Adamson <andros@umich.edu> 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * Note: some routines in this file are just trivial wrappers 38 * (e.g. nfsd4_lookup()) defined solely for the sake of consistent 39 * naming. Since all such routines have been declared "inline", 40 * there shouldn't be any associated overhead. At some point in 41 * the future, I might inline these "by hand" to clean up a 42 * little. 43 */ 44 45 #include <linux/param.h> 46 #include <linux/major.h> 47 #include <linux/slab.h> 48 #include <linux/file.h> 49 50 #include <linux/sunrpc/svc.h> 51 #include <linux/nfsd/nfsd.h> 52 #include <linux/nfsd/cache.h> 53 #include <linux/nfs4.h> 54 #include <linux/nfsd/state.h> 55 #include <linux/nfsd/xdr4.h> 56 #include <linux/nfs4_acl.h> 57 58 #define NFSDDBG_FACILITY NFSDDBG_PROC 59 60 static inline void 61 fh_dup2(struct svc_fh *dst, struct svc_fh *src) 62 { 63 fh_put(dst); 64 dget(src->fh_dentry); 65 if (src->fh_export) 66 cache_get(&src->fh_export->h); 67 *dst = *src; 68 } 69 70 static int 71 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) 72 { 73 int accmode, status; 74 75 if (open->op_truncate && 76 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE)) 77 return nfserr_inval; 78 79 accmode = MAY_NOP; 80 if (open->op_share_access & NFS4_SHARE_ACCESS_READ) 81 accmode = MAY_READ; 82 if (open->op_share_deny & NFS4_SHARE_ACCESS_WRITE) 83 accmode |= (MAY_WRITE | MAY_TRUNC); 84 accmode |= MAY_OWNER_OVERRIDE; 85 86 status = fh_verify(rqstp, current_fh, S_IFREG, accmode); 87 88 return status; 89 } 90 91 static int 92 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) 93 { 94 struct svc_fh resfh; 95 int status; 96 97 fh_init(&resfh, NFS4_FHSIZE); 98 open->op_truncate = 0; 99 100 if (open->op_create) { 101 /* 102 * Note: create modes (UNCHECKED,GUARDED...) are the same 103 * in NFSv4 as in v3. 104 */ 105 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data, 106 open->op_fname.len, &open->op_iattr, 107 &resfh, open->op_createmode, 108 (u32 *)open->op_verf.data, &open->op_truncate); 109 } 110 else { 111 status = nfsd_lookup(rqstp, current_fh, 112 open->op_fname.data, open->op_fname.len, &resfh); 113 fh_unlock(current_fh); 114 } 115 116 if (!status) { 117 set_change_info(&open->op_cinfo, current_fh); 118 119 /* set reply cache */ 120 fh_dup2(current_fh, &resfh); 121 open->op_stateowner->so_replay.rp_openfh_len = 122 resfh.fh_handle.fh_size; 123 memcpy(open->op_stateowner->so_replay.rp_openfh, 124 &resfh.fh_handle.fh_base, 125 resfh.fh_handle.fh_size); 126 127 status = do_open_permission(rqstp, current_fh, open); 128 } 129 130 fh_put(&resfh); 131 return status; 132 } 133 134 static int 135 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) 136 { 137 int status; 138 139 /* Only reclaims from previously confirmed clients are valid */ 140 if ((status = nfs4_check_open_reclaim(&open->op_clientid))) 141 return status; 142 143 /* We don't know the target directory, and therefore can not 144 * set the change info 145 */ 146 147 memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info)); 148 149 /* set replay cache */ 150 open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size; 151 memcpy(open->op_stateowner->so_replay.rp_openfh, 152 ¤t_fh->fh_handle.fh_base, 153 current_fh->fh_handle.fh_size); 154 155 open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) && 156 (open->op_iattr.ia_size == 0); 157 158 status = do_open_permission(rqstp, current_fh, open); 159 160 return status; 161 } 162 163 164 static inline int 165 nfsd4_open(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, struct nfs4_stateowner **replay_owner) 166 { 167 int status; 168 dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n", 169 (int)open->op_fname.len, open->op_fname.data, 170 open->op_stateowner); 171 172 /* This check required by spec. */ 173 if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL) 174 return nfserr_inval; 175 176 nfs4_lock_state(); 177 178 /* check seqid for replay. set nfs4_owner */ 179 status = nfsd4_process_open1(open); 180 if (status == NFSERR_REPLAY_ME) { 181 struct nfs4_replay *rp = &open->op_stateowner->so_replay; 182 fh_put(current_fh); 183 current_fh->fh_handle.fh_size = rp->rp_openfh_len; 184 memcpy(¤t_fh->fh_handle.fh_base, rp->rp_openfh, 185 rp->rp_openfh_len); 186 status = fh_verify(rqstp, current_fh, 0, MAY_NOP); 187 if (status) 188 dprintk("nfsd4_open: replay failed" 189 " restoring previous filehandle\n"); 190 else 191 status = NFSERR_REPLAY_ME; 192 } 193 if (status) 194 goto out; 195 196 /* Openowner is now set, so sequence id will get bumped. Now we need 197 * these checks before we do any creates: */ 198 status = nfserr_grace; 199 if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS) 200 goto out; 201 status = nfserr_no_grace; 202 if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) 203 goto out; 204 205 switch (open->op_claim_type) { 206 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 207 status = nfserr_inval; 208 if (open->op_create) 209 goto out; 210 /* fall through */ 211 case NFS4_OPEN_CLAIM_NULL: 212 /* 213 * (1) set CURRENT_FH to the file being opened, 214 * creating it if necessary, (2) set open->op_cinfo, 215 * (3) set open->op_truncate if the file is to be 216 * truncated after opening, (4) do permission checking. 217 */ 218 status = do_open_lookup(rqstp, current_fh, open); 219 if (status) 220 goto out; 221 break; 222 case NFS4_OPEN_CLAIM_PREVIOUS: 223 open->op_stateowner->so_confirmed = 1; 224 /* 225 * The CURRENT_FH is already set to the file being 226 * opened. (1) set open->op_cinfo, (2) set 227 * open->op_truncate if the file is to be truncated 228 * after opening, (3) do permission checking. 229 */ 230 status = do_open_fhandle(rqstp, current_fh, open); 231 if (status) 232 goto out; 233 break; 234 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 235 open->op_stateowner->so_confirmed = 1; 236 printk("NFSD: unsupported OPEN claim type %d\n", 237 open->op_claim_type); 238 status = nfserr_notsupp; 239 goto out; 240 default: 241 printk("NFSD: Invalid OPEN claim type %d\n", 242 open->op_claim_type); 243 status = nfserr_inval; 244 goto out; 245 } 246 /* 247 * nfsd4_process_open2() does the actual opening of the file. If 248 * successful, it (1) truncates the file if open->op_truncate was 249 * set, (2) sets open->op_stateid, (3) sets open->op_delegation. 250 */ 251 status = nfsd4_process_open2(rqstp, current_fh, open); 252 out: 253 if (open->op_stateowner) { 254 nfs4_get_stateowner(open->op_stateowner); 255 *replay_owner = open->op_stateowner; 256 } 257 nfs4_unlock_state(); 258 return status; 259 } 260 261 /* 262 * filehandle-manipulating ops. 263 */ 264 static inline int 265 nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh) 266 { 267 if (!current_fh->fh_dentry) 268 return nfserr_nofilehandle; 269 270 *getfh = current_fh; 271 return nfs_ok; 272 } 273 274 static inline int 275 nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh) 276 { 277 fh_put(current_fh); 278 current_fh->fh_handle.fh_size = putfh->pf_fhlen; 279 memcpy(¤t_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen); 280 return fh_verify(rqstp, current_fh, 0, MAY_NOP); 281 } 282 283 static inline int 284 nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh) 285 { 286 int status; 287 288 fh_put(current_fh); 289 status = exp_pseudoroot(rqstp->rq_client, current_fh, 290 &rqstp->rq_chandle); 291 return status; 292 } 293 294 static inline int 295 nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh) 296 { 297 if (!save_fh->fh_dentry) 298 return nfserr_restorefh; 299 300 fh_dup2(current_fh, save_fh); 301 return nfs_ok; 302 } 303 304 static inline int 305 nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh) 306 { 307 if (!current_fh->fh_dentry) 308 return nfserr_nofilehandle; 309 310 fh_dup2(save_fh, current_fh); 311 return nfs_ok; 312 } 313 314 /* 315 * misc nfsv4 ops 316 */ 317 static inline int 318 nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access) 319 { 320 if (access->ac_req_access & ~NFS3_ACCESS_FULL) 321 return nfserr_inval; 322 323 access->ac_resp_access = access->ac_req_access; 324 return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported); 325 } 326 327 static inline int 328 nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit) 329 { 330 int status; 331 332 u32 *p = (u32 *)commit->co_verf.data; 333 *p++ = nfssvc_boot.tv_sec; 334 *p++ = nfssvc_boot.tv_usec; 335 336 status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count); 337 if (status == nfserr_symlink) 338 status = nfserr_inval; 339 return status; 340 } 341 342 static int 343 nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create) 344 { 345 struct svc_fh resfh; 346 int status; 347 dev_t rdev; 348 349 fh_init(&resfh, NFS4_FHSIZE); 350 351 status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE); 352 if (status == nfserr_symlink) 353 status = nfserr_notdir; 354 if (status) 355 return status; 356 357 switch (create->cr_type) { 358 case NF4LNK: 359 /* ugh! we have to null-terminate the linktext, or 360 * vfs_symlink() will choke. it is always safe to 361 * null-terminate by brute force, since at worst we 362 * will overwrite the first byte of the create namelen 363 * in the XDR buffer, which has already been extracted 364 * during XDR decode. 365 */ 366 create->cr_linkname[create->cr_linklen] = 0; 367 368 status = nfsd_symlink(rqstp, current_fh, create->cr_name, 369 create->cr_namelen, create->cr_linkname, 370 create->cr_linklen, &resfh, &create->cr_iattr); 371 break; 372 373 case NF4BLK: 374 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2); 375 if (MAJOR(rdev) != create->cr_specdata1 || 376 MINOR(rdev) != create->cr_specdata2) 377 return nfserr_inval; 378 status = nfsd_create(rqstp, current_fh, create->cr_name, 379 create->cr_namelen, &create->cr_iattr, 380 S_IFBLK, rdev, &resfh); 381 break; 382 383 case NF4CHR: 384 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2); 385 if (MAJOR(rdev) != create->cr_specdata1 || 386 MINOR(rdev) != create->cr_specdata2) 387 return nfserr_inval; 388 status = nfsd_create(rqstp, current_fh, create->cr_name, 389 create->cr_namelen, &create->cr_iattr, 390 S_IFCHR, rdev, &resfh); 391 break; 392 393 case NF4SOCK: 394 status = nfsd_create(rqstp, current_fh, create->cr_name, 395 create->cr_namelen, &create->cr_iattr, 396 S_IFSOCK, 0, &resfh); 397 break; 398 399 case NF4FIFO: 400 status = nfsd_create(rqstp, current_fh, create->cr_name, 401 create->cr_namelen, &create->cr_iattr, 402 S_IFIFO, 0, &resfh); 403 break; 404 405 case NF4DIR: 406 create->cr_iattr.ia_valid &= ~ATTR_SIZE; 407 status = nfsd_create(rqstp, current_fh, create->cr_name, 408 create->cr_namelen, &create->cr_iattr, 409 S_IFDIR, 0, &resfh); 410 break; 411 412 default: 413 status = nfserr_badtype; 414 } 415 416 if (!status) { 417 fh_unlock(current_fh); 418 set_change_info(&create->cr_cinfo, current_fh); 419 fh_dup2(current_fh, &resfh); 420 } 421 422 fh_put(&resfh); 423 return status; 424 } 425 426 static inline int 427 nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr) 428 { 429 int status; 430 431 status = fh_verify(rqstp, current_fh, 0, MAY_NOP); 432 if (status) 433 return status; 434 435 if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1) 436 return nfserr_inval; 437 438 getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0; 439 getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1; 440 441 getattr->ga_fhp = current_fh; 442 return nfs_ok; 443 } 444 445 static inline int 446 nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh, 447 struct svc_fh *save_fh, struct nfsd4_link *link) 448 { 449 int status = nfserr_nofilehandle; 450 451 if (!save_fh->fh_dentry) 452 return status; 453 status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh); 454 if (!status) 455 set_change_info(&link->li_cinfo, current_fh); 456 return status; 457 } 458 459 static int 460 nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh) 461 { 462 struct svc_fh tmp_fh; 463 int ret; 464 465 fh_init(&tmp_fh, NFS4_FHSIZE); 466 if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh, 467 &rqstp->rq_chandle)) != 0) 468 return ret; 469 if (tmp_fh.fh_dentry == current_fh->fh_dentry) { 470 fh_put(&tmp_fh); 471 return nfserr_noent; 472 } 473 fh_put(&tmp_fh); 474 return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh); 475 } 476 477 static inline int 478 nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup) 479 { 480 return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh); 481 } 482 483 static inline int 484 nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read) 485 { 486 int status; 487 488 /* no need to check permission - this will be done in nfsd_read() */ 489 490 read->rd_filp = NULL; 491 if (read->rd_offset >= OFFSET_MAX) 492 return nfserr_inval; 493 494 nfs4_lock_state(); 495 /* check stateid */ 496 if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid, 497 CHECK_FH | RD_STATE, &read->rd_filp))) { 498 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n"); 499 goto out; 500 } 501 if (read->rd_filp) 502 get_file(read->rd_filp); 503 status = nfs_ok; 504 out: 505 nfs4_unlock_state(); 506 read->rd_rqstp = rqstp; 507 read->rd_fhp = current_fh; 508 return status; 509 } 510 511 static inline int 512 nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir) 513 { 514 u64 cookie = readdir->rd_cookie; 515 static const nfs4_verifier zeroverf; 516 517 /* no need to check permission - this will be done in nfsd_readdir() */ 518 519 if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1) 520 return nfserr_inval; 521 522 readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0; 523 readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1; 524 525 if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) || 526 (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE))) 527 return nfserr_bad_cookie; 528 529 readdir->rd_rqstp = rqstp; 530 readdir->rd_fhp = current_fh; 531 return nfs_ok; 532 } 533 534 static inline int 535 nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink) 536 { 537 readlink->rl_rqstp = rqstp; 538 readlink->rl_fhp = current_fh; 539 return nfs_ok; 540 } 541 542 static inline int 543 nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove) 544 { 545 int status; 546 547 if (nfs4_in_grace()) 548 return nfserr_grace; 549 status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen); 550 if (status == nfserr_symlink) 551 return nfserr_notdir; 552 if (!status) { 553 fh_unlock(current_fh); 554 set_change_info(&remove->rm_cinfo, current_fh); 555 } 556 return status; 557 } 558 559 static inline int 560 nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh, 561 struct svc_fh *save_fh, struct nfsd4_rename *rename) 562 { 563 int status = nfserr_nofilehandle; 564 565 if (!save_fh->fh_dentry) 566 return status; 567 if (nfs4_in_grace() && !(save_fh->fh_export->ex_flags 568 & NFSEXP_NOSUBTREECHECK)) 569 return nfserr_grace; 570 status = nfsd_rename(rqstp, save_fh, rename->rn_sname, 571 rename->rn_snamelen, current_fh, 572 rename->rn_tname, rename->rn_tnamelen); 573 574 /* the underlying filesystem returns different error's than required 575 * by NFSv4. both save_fh and current_fh have been verified.. */ 576 if (status == nfserr_isdir) 577 status = nfserr_exist; 578 else if ((status == nfserr_notdir) && 579 (S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) && 580 S_ISDIR(current_fh->fh_dentry->d_inode->i_mode))) 581 status = nfserr_exist; 582 else if (status == nfserr_symlink) 583 status = nfserr_notdir; 584 585 if (!status) { 586 set_change_info(&rename->rn_sinfo, current_fh); 587 set_change_info(&rename->rn_tinfo, save_fh); 588 } 589 return status; 590 } 591 592 static inline int 593 nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr) 594 { 595 int status = nfs_ok; 596 597 if (setattr->sa_iattr.ia_valid & ATTR_SIZE) { 598 nfs4_lock_state(); 599 status = nfs4_preprocess_stateid_op(current_fh, 600 &setattr->sa_stateid, CHECK_FH | WR_STATE, NULL); 601 nfs4_unlock_state(); 602 if (status) { 603 dprintk("NFSD: nfsd4_setattr: couldn't process stateid!"); 604 return status; 605 } 606 } 607 status = nfs_ok; 608 if (setattr->sa_acl != NULL) 609 status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl); 610 if (status) 611 return status; 612 status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr, 613 0, (time_t)0); 614 return status; 615 } 616 617 static inline int 618 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write) 619 { 620 stateid_t *stateid = &write->wr_stateid; 621 struct file *filp = NULL; 622 u32 *p; 623 int status = nfs_ok; 624 625 /* no need to check permission - this will be done in nfsd_write() */ 626 627 if (write->wr_offset >= OFFSET_MAX) 628 return nfserr_inval; 629 630 nfs4_lock_state(); 631 status = nfs4_preprocess_stateid_op(current_fh, stateid, 632 CHECK_FH | WR_STATE, &filp); 633 if (filp) 634 get_file(filp); 635 nfs4_unlock_state(); 636 637 if (status) { 638 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n"); 639 return status; 640 } 641 642 write->wr_bytes_written = write->wr_buflen; 643 write->wr_how_written = write->wr_stable_how; 644 p = (u32 *)write->wr_verifier.data; 645 *p++ = nfssvc_boot.tv_sec; 646 *p++ = nfssvc_boot.tv_usec; 647 648 status = nfsd_write(rqstp, current_fh, filp, write->wr_offset, 649 write->wr_vec, write->wr_vlen, write->wr_buflen, 650 &write->wr_how_written); 651 if (filp) 652 fput(filp); 653 654 if (status == nfserr_symlink) 655 status = nfserr_inval; 656 return status; 657 } 658 659 /* This routine never returns NFS_OK! If there are no other errors, it 660 * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the 661 * attributes matched. VERIFY is implemented by mapping NFSERR_SAME 662 * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK. 663 */ 664 static int 665 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify) 666 { 667 u32 *buf, *p; 668 int count; 669 int status; 670 671 status = fh_verify(rqstp, current_fh, 0, MAY_NOP); 672 if (status) 673 return status; 674 675 if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) 676 || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1)) 677 return nfserr_attrnotsupp; 678 if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR) 679 || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)) 680 return nfserr_inval; 681 if (verify->ve_attrlen & 3) 682 return nfserr_inval; 683 684 /* count in words: 685 * bitmap_len(1) + bitmap(2) + attr_len(1) = 4 686 */ 687 count = 4 + (verify->ve_attrlen >> 2); 688 buf = kmalloc(count << 2, GFP_KERNEL); 689 if (!buf) 690 return nfserr_resource; 691 692 status = nfsd4_encode_fattr(current_fh, current_fh->fh_export, 693 current_fh->fh_dentry, buf, 694 &count, verify->ve_bmval, 695 rqstp); 696 697 /* this means that nfsd4_encode_fattr() ran out of space */ 698 if (status == nfserr_resource && count == 0) 699 status = nfserr_not_same; 700 if (status) 701 goto out_kfree; 702 703 p = buf + 3; 704 status = nfserr_not_same; 705 if (ntohl(*p++) != verify->ve_attrlen) 706 goto out_kfree; 707 if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen)) 708 status = nfserr_same; 709 710 out_kfree: 711 kfree(buf); 712 return status; 713 } 714 715 /* 716 * NULL call. 717 */ 718 static int 719 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 720 { 721 return nfs_ok; 722 } 723 724 static inline void nfsd4_increment_op_stats(u32 opnum) 725 { 726 if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP) 727 nfsdstats.nfs4_opcount[opnum]++; 728 } 729 730 731 /* 732 * COMPOUND call. 733 */ 734 static int 735 nfsd4_proc_compound(struct svc_rqst *rqstp, 736 struct nfsd4_compoundargs *args, 737 struct nfsd4_compoundres *resp) 738 { 739 struct nfsd4_op *op; 740 struct svc_fh *current_fh = NULL; 741 struct svc_fh *save_fh = NULL; 742 struct nfs4_stateowner *replay_owner = NULL; 743 int slack_space; /* in words, not bytes! */ 744 int status; 745 746 status = nfserr_resource; 747 current_fh = kmalloc(sizeof(*current_fh), GFP_KERNEL); 748 if (current_fh == NULL) 749 goto out; 750 fh_init(current_fh, NFS4_FHSIZE); 751 save_fh = kmalloc(sizeof(*save_fh), GFP_KERNEL); 752 if (save_fh == NULL) 753 goto out; 754 fh_init(save_fh, NFS4_FHSIZE); 755 756 resp->xbuf = &rqstp->rq_res; 757 resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len; 758 resp->tagp = resp->p; 759 /* reserve space for: taglen, tag, and opcnt */ 760 resp->p += 2 + XDR_QUADLEN(args->taglen); 761 resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE; 762 resp->taglen = args->taglen; 763 resp->tag = args->tag; 764 resp->opcnt = 0; 765 resp->rqstp = rqstp; 766 767 /* 768 * According to RFC3010, this takes precedence over all other errors. 769 */ 770 status = nfserr_minor_vers_mismatch; 771 if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION) 772 goto out; 773 774 status = nfs_ok; 775 while (!status && resp->opcnt < args->opcnt) { 776 op = &args->ops[resp->opcnt++]; 777 778 dprintk("nfsv4 compound op #%d: %d\n", resp->opcnt, op->opnum); 779 780 /* 781 * The XDR decode routines may have pre-set op->status; 782 * for example, if there is a miscellaneous XDR error 783 * it will be set to nfserr_bad_xdr. 784 */ 785 if (op->status) 786 goto encode_op; 787 788 /* We must be able to encode a successful response to 789 * this operation, with enough room left over to encode a 790 * failed response to the next operation. If we don't 791 * have enough room, fail with ERR_RESOURCE. 792 */ 793 /* FIXME - is slack_space *really* words, or bytes??? - neilb */ 794 slack_space = (char *)resp->end - (char *)resp->p; 795 if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) { 796 BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE); 797 op->status = nfserr_resource; 798 goto encode_op; 799 } 800 801 /* All operations except RENEW, SETCLIENTID, RESTOREFH 802 * SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH 803 * require a valid current filehandle 804 */ 805 if ((!current_fh->fh_dentry) && 806 !((op->opnum == OP_PUTFH) || (op->opnum == OP_PUTROOTFH) || 807 (op->opnum == OP_SETCLIENTID) || 808 (op->opnum == OP_SETCLIENTID_CONFIRM) || 809 (op->opnum == OP_RENEW) || (op->opnum == OP_RESTOREFH) || 810 (op->opnum == OP_RELEASE_LOCKOWNER))) { 811 op->status = nfserr_nofilehandle; 812 goto encode_op; 813 } 814 switch (op->opnum) { 815 case OP_ACCESS: 816 op->status = nfsd4_access(rqstp, current_fh, &op->u.access); 817 break; 818 case OP_CLOSE: 819 op->status = nfsd4_close(rqstp, current_fh, &op->u.close, &replay_owner); 820 break; 821 case OP_COMMIT: 822 op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit); 823 break; 824 case OP_CREATE: 825 op->status = nfsd4_create(rqstp, current_fh, &op->u.create); 826 break; 827 case OP_DELEGRETURN: 828 op->status = nfsd4_delegreturn(rqstp, current_fh, &op->u.delegreturn); 829 break; 830 case OP_GETATTR: 831 op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr); 832 break; 833 case OP_GETFH: 834 op->status = nfsd4_getfh(current_fh, &op->u.getfh); 835 break; 836 case OP_LINK: 837 op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link); 838 break; 839 case OP_LOCK: 840 op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock, &replay_owner); 841 break; 842 case OP_LOCKT: 843 op->status = nfsd4_lockt(rqstp, current_fh, &op->u.lockt); 844 break; 845 case OP_LOCKU: 846 op->status = nfsd4_locku(rqstp, current_fh, &op->u.locku, &replay_owner); 847 break; 848 case OP_LOOKUP: 849 op->status = nfsd4_lookup(rqstp, current_fh, &op->u.lookup); 850 break; 851 case OP_LOOKUPP: 852 op->status = nfsd4_lookupp(rqstp, current_fh); 853 break; 854 case OP_NVERIFY: 855 op->status = nfsd4_verify(rqstp, current_fh, &op->u.nverify); 856 if (op->status == nfserr_not_same) 857 op->status = nfs_ok; 858 break; 859 case OP_OPEN: 860 op->status = nfsd4_open(rqstp, current_fh, &op->u.open, &replay_owner); 861 break; 862 case OP_OPEN_CONFIRM: 863 op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm, &replay_owner); 864 break; 865 case OP_OPEN_DOWNGRADE: 866 op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade, &replay_owner); 867 break; 868 case OP_PUTFH: 869 op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh); 870 break; 871 case OP_PUTROOTFH: 872 op->status = nfsd4_putrootfh(rqstp, current_fh); 873 break; 874 case OP_READ: 875 op->status = nfsd4_read(rqstp, current_fh, &op->u.read); 876 break; 877 case OP_READDIR: 878 op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir); 879 break; 880 case OP_READLINK: 881 op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink); 882 break; 883 case OP_REMOVE: 884 op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove); 885 break; 886 case OP_RENAME: 887 op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename); 888 break; 889 case OP_RENEW: 890 op->status = nfsd4_renew(&op->u.renew); 891 break; 892 case OP_RESTOREFH: 893 op->status = nfsd4_restorefh(current_fh, save_fh); 894 break; 895 case OP_SAVEFH: 896 op->status = nfsd4_savefh(current_fh, save_fh); 897 break; 898 case OP_SETATTR: 899 op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr); 900 break; 901 case OP_SETCLIENTID: 902 op->status = nfsd4_setclientid(rqstp, &op->u.setclientid); 903 break; 904 case OP_SETCLIENTID_CONFIRM: 905 op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm); 906 break; 907 case OP_VERIFY: 908 op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify); 909 if (op->status == nfserr_same) 910 op->status = nfs_ok; 911 break; 912 case OP_WRITE: 913 op->status = nfsd4_write(rqstp, current_fh, &op->u.write); 914 break; 915 case OP_RELEASE_LOCKOWNER: 916 op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner); 917 break; 918 default: 919 BUG_ON(op->status == nfs_ok); 920 break; 921 } 922 923 encode_op: 924 if (op->status == NFSERR_REPLAY_ME) { 925 op->replay = &replay_owner->so_replay; 926 nfsd4_encode_replay(resp, op); 927 status = op->status = op->replay->rp_status; 928 } else { 929 nfsd4_encode_operation(resp, op); 930 status = op->status; 931 } 932 if (replay_owner && (replay_owner != (void *)(-1))) { 933 nfs4_put_stateowner(replay_owner); 934 replay_owner = NULL; 935 } 936 /* XXX Ugh, we need to get rid of this kind of special case: */ 937 if (op->opnum == OP_READ && op->u.read.rd_filp) 938 fput(op->u.read.rd_filp); 939 940 nfsd4_increment_op_stats(op->opnum); 941 } 942 943 out: 944 nfsd4_release_compoundargs(args); 945 if (current_fh) 946 fh_put(current_fh); 947 kfree(current_fh); 948 if (save_fh) 949 fh_put(save_fh); 950 kfree(save_fh); 951 return status; 952 } 953 954 #define nfs4svc_decode_voidargs NULL 955 #define nfs4svc_release_void NULL 956 #define nfsd4_voidres nfsd4_voidargs 957 #define nfs4svc_release_compound NULL 958 struct nfsd4_voidargs { int dummy; }; 959 960 #define PROC(name, argt, rest, relt, cache, respsize) \ 961 { (svc_procfunc) nfsd4_proc_##name, \ 962 (kxdrproc_t) nfs4svc_decode_##argt##args, \ 963 (kxdrproc_t) nfs4svc_encode_##rest##res, \ 964 (kxdrproc_t) nfs4svc_release_##relt, \ 965 sizeof(struct nfsd4_##argt##args), \ 966 sizeof(struct nfsd4_##rest##res), \ 967 0, \ 968 cache, \ 969 respsize, \ 970 } 971 972 /* 973 * TODO: At the present time, the NFSv4 server does not do XID caching 974 * of requests. Implementing XID caching would not be a serious problem, 975 * although it would require a mild change in interfaces since one 976 * doesn't know whether an NFSv4 request is idempotent until after the 977 * XDR decode. However, XID caching totally confuses pynfs (Peter 978 * Astrand's regression testsuite for NFSv4 servers), which reuses 979 * XID's liberally, so I've left it unimplemented until pynfs generates 980 * better XID's. 981 */ 982 static struct svc_procedure nfsd_procedures4[2] = { 983 PROC(null, void, void, void, RC_NOCACHE, 1), 984 PROC(compound, compound, compound, compound, RC_NOCACHE, NFSD_BUFSIZE/4) 985 }; 986 987 struct svc_version nfsd_version4 = { 988 .vs_vers = 4, 989 .vs_nproc = 2, 990 .vs_proc = nfsd_procedures4, 991 .vs_dispatch = nfsd_dispatch, 992 .vs_xdrsize = NFS4_SVC_XDRSIZE, 993 }; 994 995 /* 996 * Local variables: 997 * c-basic-offset: 8 998 * End: 999 */ 1000