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 switch (open->op_claim_type) { 196 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 197 status = nfserr_inval; 198 if (open->op_create) 199 goto out; 200 /* fall through */ 201 case NFS4_OPEN_CLAIM_NULL: 202 /* 203 * (1) set CURRENT_FH to the file being opened, 204 * creating it if necessary, (2) set open->op_cinfo, 205 * (3) set open->op_truncate if the file is to be 206 * truncated after opening, (4) do permission checking. 207 */ 208 status = do_open_lookup(rqstp, current_fh, open); 209 if (status) 210 goto out; 211 break; 212 case NFS4_OPEN_CLAIM_PREVIOUS: 213 /* 214 * The CURRENT_FH is already set to the file being 215 * opened. (1) set open->op_cinfo, (2) set 216 * open->op_truncate if the file is to be truncated 217 * after opening, (3) do permission checking. 218 */ 219 status = do_open_fhandle(rqstp, current_fh, open); 220 if (status) 221 goto out; 222 break; 223 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 224 printk("NFSD: unsupported OPEN claim type %d\n", 225 open->op_claim_type); 226 status = nfserr_notsupp; 227 goto out; 228 default: 229 printk("NFSD: Invalid OPEN claim type %d\n", 230 open->op_claim_type); 231 status = nfserr_inval; 232 goto out; 233 } 234 /* 235 * nfsd4_process_open2() does the actual opening of the file. If 236 * successful, it (1) truncates the file if open->op_truncate was 237 * set, (2) sets open->op_stateid, (3) sets open->op_delegation. 238 */ 239 status = nfsd4_process_open2(rqstp, current_fh, open); 240 out: 241 if (open->op_stateowner) { 242 nfs4_get_stateowner(open->op_stateowner); 243 *replay_owner = open->op_stateowner; 244 } 245 nfs4_unlock_state(); 246 return status; 247 } 248 249 /* 250 * filehandle-manipulating ops. 251 */ 252 static inline int 253 nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh) 254 { 255 if (!current_fh->fh_dentry) 256 return nfserr_nofilehandle; 257 258 *getfh = current_fh; 259 return nfs_ok; 260 } 261 262 static inline int 263 nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh) 264 { 265 fh_put(current_fh); 266 current_fh->fh_handle.fh_size = putfh->pf_fhlen; 267 memcpy(¤t_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen); 268 return fh_verify(rqstp, current_fh, 0, MAY_NOP); 269 } 270 271 static inline int 272 nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh) 273 { 274 int status; 275 276 fh_put(current_fh); 277 status = exp_pseudoroot(rqstp->rq_client, current_fh, 278 &rqstp->rq_chandle); 279 if (!status) 280 status = nfserrno(nfsd_setuser(rqstp, current_fh->fh_export)); 281 return status; 282 } 283 284 static inline int 285 nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh) 286 { 287 if (!save_fh->fh_dentry) 288 return nfserr_restorefh; 289 290 fh_dup2(current_fh, save_fh); 291 return nfs_ok; 292 } 293 294 static inline int 295 nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh) 296 { 297 if (!current_fh->fh_dentry) 298 return nfserr_nofilehandle; 299 300 fh_dup2(save_fh, current_fh); 301 return nfs_ok; 302 } 303 304 /* 305 * misc nfsv4 ops 306 */ 307 static inline int 308 nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access) 309 { 310 if (access->ac_req_access & ~NFS3_ACCESS_FULL) 311 return nfserr_inval; 312 313 access->ac_resp_access = access->ac_req_access; 314 return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported); 315 } 316 317 static inline int 318 nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit) 319 { 320 int status; 321 322 u32 *p = (u32 *)commit->co_verf.data; 323 *p++ = nfssvc_boot.tv_sec; 324 *p++ = nfssvc_boot.tv_usec; 325 326 status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count); 327 if (status == nfserr_symlink) 328 status = nfserr_inval; 329 return status; 330 } 331 332 static int 333 nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create) 334 { 335 struct svc_fh resfh; 336 int status; 337 dev_t rdev; 338 339 fh_init(&resfh, NFS4_FHSIZE); 340 341 status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE); 342 if (status == nfserr_symlink) 343 status = nfserr_notdir; 344 if (status) 345 return status; 346 347 switch (create->cr_type) { 348 case NF4LNK: 349 /* ugh! we have to null-terminate the linktext, or 350 * vfs_symlink() will choke. it is always safe to 351 * null-terminate by brute force, since at worst we 352 * will overwrite the first byte of the create namelen 353 * in the XDR buffer, which has already been extracted 354 * during XDR decode. 355 */ 356 create->cr_linkname[create->cr_linklen] = 0; 357 358 status = nfsd_symlink(rqstp, current_fh, create->cr_name, 359 create->cr_namelen, create->cr_linkname, 360 create->cr_linklen, &resfh, &create->cr_iattr); 361 break; 362 363 case NF4BLK: 364 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2); 365 if (MAJOR(rdev) != create->cr_specdata1 || 366 MINOR(rdev) != create->cr_specdata2) 367 return nfserr_inval; 368 status = nfsd_create(rqstp, current_fh, create->cr_name, 369 create->cr_namelen, &create->cr_iattr, 370 S_IFBLK, rdev, &resfh); 371 break; 372 373 case NF4CHR: 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_IFCHR, rdev, &resfh); 381 break; 382 383 case NF4SOCK: 384 status = nfsd_create(rqstp, current_fh, create->cr_name, 385 create->cr_namelen, &create->cr_iattr, 386 S_IFSOCK, 0, &resfh); 387 break; 388 389 case NF4FIFO: 390 status = nfsd_create(rqstp, current_fh, create->cr_name, 391 create->cr_namelen, &create->cr_iattr, 392 S_IFIFO, 0, &resfh); 393 break; 394 395 case NF4DIR: 396 create->cr_iattr.ia_valid &= ~ATTR_SIZE; 397 status = nfsd_create(rqstp, current_fh, create->cr_name, 398 create->cr_namelen, &create->cr_iattr, 399 S_IFDIR, 0, &resfh); 400 break; 401 402 default: 403 status = nfserr_badtype; 404 } 405 406 if (!status) { 407 fh_unlock(current_fh); 408 set_change_info(&create->cr_cinfo, current_fh); 409 fh_dup2(current_fh, &resfh); 410 } 411 412 fh_put(&resfh); 413 return status; 414 } 415 416 static inline int 417 nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr) 418 { 419 int status; 420 421 status = fh_verify(rqstp, current_fh, 0, MAY_NOP); 422 if (status) 423 return status; 424 425 if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1) 426 return nfserr_inval; 427 428 getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0; 429 getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1; 430 431 getattr->ga_fhp = current_fh; 432 return nfs_ok; 433 } 434 435 static inline int 436 nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh, 437 struct svc_fh *save_fh, struct nfsd4_link *link) 438 { 439 int status = nfserr_nofilehandle; 440 441 if (!save_fh->fh_dentry) 442 return status; 443 status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh); 444 if (!status) 445 set_change_info(&link->li_cinfo, current_fh); 446 return status; 447 } 448 449 static int 450 nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh) 451 { 452 struct svc_fh tmp_fh; 453 int ret; 454 455 fh_init(&tmp_fh, NFS4_FHSIZE); 456 if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh, 457 &rqstp->rq_chandle)) != 0) 458 return ret; 459 if (tmp_fh.fh_dentry == current_fh->fh_dentry) { 460 fh_put(&tmp_fh); 461 return nfserr_noent; 462 } 463 fh_put(&tmp_fh); 464 return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh); 465 } 466 467 static inline int 468 nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup) 469 { 470 return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh); 471 } 472 473 static inline int 474 nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read) 475 { 476 int status; 477 478 /* no need to check permission - this will be done in nfsd_read() */ 479 480 read->rd_filp = NULL; 481 if (read->rd_offset >= OFFSET_MAX) 482 return nfserr_inval; 483 484 nfs4_lock_state(); 485 /* check stateid */ 486 if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid, 487 CHECK_FH | RD_STATE, &read->rd_filp))) { 488 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n"); 489 goto out; 490 } 491 if (read->rd_filp) 492 get_file(read->rd_filp); 493 status = nfs_ok; 494 out: 495 nfs4_unlock_state(); 496 read->rd_rqstp = rqstp; 497 read->rd_fhp = current_fh; 498 return status; 499 } 500 501 static inline int 502 nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir) 503 { 504 u64 cookie = readdir->rd_cookie; 505 static const nfs4_verifier zeroverf; 506 507 /* no need to check permission - this will be done in nfsd_readdir() */ 508 509 if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1) 510 return nfserr_inval; 511 512 readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0; 513 readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1; 514 515 if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) || 516 (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE))) 517 return nfserr_bad_cookie; 518 519 readdir->rd_rqstp = rqstp; 520 readdir->rd_fhp = current_fh; 521 return nfs_ok; 522 } 523 524 static inline int 525 nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink) 526 { 527 readlink->rl_rqstp = rqstp; 528 readlink->rl_fhp = current_fh; 529 return nfs_ok; 530 } 531 532 static inline int 533 nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove) 534 { 535 int status; 536 537 if (nfs4_in_grace()) 538 return nfserr_grace; 539 status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen); 540 if (status == nfserr_symlink) 541 return nfserr_notdir; 542 if (!status) { 543 fh_unlock(current_fh); 544 set_change_info(&remove->rm_cinfo, current_fh); 545 } 546 return status; 547 } 548 549 static inline int 550 nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh, 551 struct svc_fh *save_fh, struct nfsd4_rename *rename) 552 { 553 int status = nfserr_nofilehandle; 554 555 if (!save_fh->fh_dentry) 556 return status; 557 if (nfs4_in_grace() && !(save_fh->fh_export->ex_flags 558 & NFSEXP_NOSUBTREECHECK)) 559 return nfserr_grace; 560 status = nfsd_rename(rqstp, save_fh, rename->rn_sname, 561 rename->rn_snamelen, current_fh, 562 rename->rn_tname, rename->rn_tnamelen); 563 564 /* the underlying filesystem returns different error's than required 565 * by NFSv4. both save_fh and current_fh have been verified.. */ 566 if (status == nfserr_isdir) 567 status = nfserr_exist; 568 else if ((status == nfserr_notdir) && 569 (S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) && 570 S_ISDIR(current_fh->fh_dentry->d_inode->i_mode))) 571 status = nfserr_exist; 572 else if (status == nfserr_symlink) 573 status = nfserr_notdir; 574 575 if (!status) { 576 set_change_info(&rename->rn_sinfo, current_fh); 577 set_change_info(&rename->rn_tinfo, save_fh); 578 } 579 return status; 580 } 581 582 static inline int 583 nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr) 584 { 585 int status = nfs_ok; 586 587 if (!current_fh->fh_dentry) 588 return nfserr_nofilehandle; 589 590 status = nfs_ok; 591 if (setattr->sa_iattr.ia_valid & ATTR_SIZE) { 592 nfs4_lock_state(); 593 if ((status = nfs4_preprocess_stateid_op(current_fh, 594 &setattr->sa_stateid, 595 CHECK_FH | WR_STATE, NULL))) { 596 dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n"); 597 goto out_unlock; 598 } 599 nfs4_unlock_state(); 600 } 601 status = nfs_ok; 602 if (setattr->sa_acl != NULL) 603 status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl); 604 if (status) 605 goto out; 606 status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr, 607 0, (time_t)0); 608 out: 609 return status; 610 out_unlock: 611 nfs4_unlock_state(); 612 return status; 613 } 614 615 static inline int 616 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write) 617 { 618 stateid_t *stateid = &write->wr_stateid; 619 struct file *filp = NULL; 620 u32 *p; 621 int status = nfs_ok; 622 623 /* no need to check permission - this will be done in nfsd_write() */ 624 625 if (write->wr_offset >= OFFSET_MAX) 626 return nfserr_inval; 627 628 nfs4_lock_state(); 629 if ((status = nfs4_preprocess_stateid_op(current_fh, stateid, 630 CHECK_FH | WR_STATE, &filp))) { 631 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n"); 632 goto out; 633 } 634 if (filp) 635 get_file(filp); 636 nfs4_unlock_state(); 637 638 write->wr_bytes_written = write->wr_buflen; 639 write->wr_how_written = write->wr_stable_how; 640 p = (u32 *)write->wr_verifier.data; 641 *p++ = nfssvc_boot.tv_sec; 642 *p++ = nfssvc_boot.tv_usec; 643 644 status = nfsd_write(rqstp, current_fh, filp, write->wr_offset, 645 write->wr_vec, write->wr_vlen, write->wr_buflen, 646 &write->wr_how_written); 647 if (filp) 648 fput(filp); 649 650 if (status == nfserr_symlink) 651 status = nfserr_inval; 652 return status; 653 out: 654 nfs4_unlock_state(); 655 return status; 656 } 657 658 /* This routine never returns NFS_OK! If there are no other errors, it 659 * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the 660 * attributes matched. VERIFY is implemented by mapping NFSERR_SAME 661 * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK. 662 */ 663 static int 664 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify) 665 { 666 u32 *buf, *p; 667 int count; 668 int status; 669 670 status = fh_verify(rqstp, current_fh, 0, MAY_NOP); 671 if (status) 672 return status; 673 674 if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) 675 || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1)) 676 return nfserr_attrnotsupp; 677 if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR) 678 || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)) 679 return nfserr_inval; 680 if (verify->ve_attrlen & 3) 681 return nfserr_inval; 682 683 /* count in words: 684 * bitmap_len(1) + bitmap(2) + attr_len(1) = 4 685 */ 686 count = 4 + (verify->ve_attrlen >> 2); 687 buf = kmalloc(count << 2, GFP_KERNEL); 688 if (!buf) 689 return nfserr_resource; 690 691 status = nfsd4_encode_fattr(current_fh, current_fh->fh_export, 692 current_fh->fh_dentry, buf, 693 &count, verify->ve_bmval, 694 rqstp); 695 696 /* this means that nfsd4_encode_fattr() ran out of space */ 697 if (status == nfserr_resource && count == 0) 698 status = nfserr_not_same; 699 if (status) 700 goto out_kfree; 701 702 p = buf + 3; 703 status = nfserr_not_same; 704 if (ntohl(*p++) != verify->ve_attrlen) 705 goto out_kfree; 706 if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen)) 707 status = nfserr_same; 708 709 out_kfree: 710 kfree(buf); 711 return status; 712 } 713 714 /* 715 * NULL call. 716 */ 717 static int 718 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 719 { 720 return nfs_ok; 721 } 722 723 724 /* 725 * COMPOUND call. 726 */ 727 static int 728 nfsd4_proc_compound(struct svc_rqst *rqstp, 729 struct nfsd4_compoundargs *args, 730 struct nfsd4_compoundres *resp) 731 { 732 struct nfsd4_op *op; 733 struct svc_fh *current_fh = NULL; 734 struct svc_fh *save_fh = NULL; 735 struct nfs4_stateowner *replay_owner = NULL; 736 int slack_space; /* in words, not bytes! */ 737 int status; 738 739 status = nfserr_resource; 740 current_fh = kmalloc(sizeof(*current_fh), GFP_KERNEL); 741 if (current_fh == NULL) 742 goto out; 743 fh_init(current_fh, NFS4_FHSIZE); 744 save_fh = kmalloc(sizeof(*save_fh), GFP_KERNEL); 745 if (save_fh == NULL) 746 goto out; 747 fh_init(save_fh, NFS4_FHSIZE); 748 749 resp->xbuf = &rqstp->rq_res; 750 resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len; 751 resp->tagp = resp->p; 752 /* reserve space for: taglen, tag, and opcnt */ 753 resp->p += 2 + XDR_QUADLEN(args->taglen); 754 resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE; 755 resp->taglen = args->taglen; 756 resp->tag = args->tag; 757 resp->opcnt = 0; 758 resp->rqstp = rqstp; 759 760 /* 761 * According to RFC3010, this takes precedence over all other errors. 762 */ 763 status = nfserr_minor_vers_mismatch; 764 if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION) 765 goto out; 766 767 status = nfs_ok; 768 while (!status && resp->opcnt < args->opcnt) { 769 op = &args->ops[resp->opcnt++]; 770 771 /* 772 * The XDR decode routines may have pre-set op->status; 773 * for example, if there is a miscellaneous XDR error 774 * it will be set to nfserr_bad_xdr. 775 */ 776 if (op->status) 777 goto encode_op; 778 779 /* We must be able to encode a successful response to 780 * this operation, with enough room left over to encode a 781 * failed response to the next operation. If we don't 782 * have enough room, fail with ERR_RESOURCE. 783 */ 784 /* FIXME - is slack_space *really* words, or bytes??? - neilb */ 785 slack_space = (char *)resp->end - (char *)resp->p; 786 if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) { 787 BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE); 788 op->status = nfserr_resource; 789 goto encode_op; 790 } 791 792 /* All operations except RENEW, SETCLIENTID, RESTOREFH 793 * SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH 794 * require a valid current filehandle 795 * 796 * SETATTR NOFILEHANDLE error handled in nfsd4_setattr 797 * due to required returned bitmap argument 798 */ 799 if ((!current_fh->fh_dentry) && 800 !((op->opnum == OP_PUTFH) || (op->opnum == OP_PUTROOTFH) || 801 (op->opnum == OP_SETCLIENTID) || 802 (op->opnum == OP_SETCLIENTID_CONFIRM) || 803 (op->opnum == OP_RENEW) || (op->opnum == OP_RESTOREFH) || 804 (op->opnum == OP_RELEASE_LOCKOWNER) || 805 (op->opnum == OP_SETATTR))) { 806 op->status = nfserr_nofilehandle; 807 goto encode_op; 808 } 809 switch (op->opnum) { 810 case OP_ACCESS: 811 op->status = nfsd4_access(rqstp, current_fh, &op->u.access); 812 break; 813 case OP_CLOSE: 814 op->status = nfsd4_close(rqstp, current_fh, &op->u.close, &replay_owner); 815 break; 816 case OP_COMMIT: 817 op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit); 818 break; 819 case OP_CREATE: 820 op->status = nfsd4_create(rqstp, current_fh, &op->u.create); 821 break; 822 case OP_DELEGRETURN: 823 op->status = nfsd4_delegreturn(rqstp, current_fh, &op->u.delegreturn); 824 break; 825 case OP_GETATTR: 826 op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr); 827 break; 828 case OP_GETFH: 829 op->status = nfsd4_getfh(current_fh, &op->u.getfh); 830 break; 831 case OP_LINK: 832 op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link); 833 break; 834 case OP_LOCK: 835 op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock, &replay_owner); 836 break; 837 case OP_LOCKT: 838 op->status = nfsd4_lockt(rqstp, current_fh, &op->u.lockt); 839 break; 840 case OP_LOCKU: 841 op->status = nfsd4_locku(rqstp, current_fh, &op->u.locku, &replay_owner); 842 break; 843 case OP_LOOKUP: 844 op->status = nfsd4_lookup(rqstp, current_fh, &op->u.lookup); 845 break; 846 case OP_LOOKUPP: 847 op->status = nfsd4_lookupp(rqstp, current_fh); 848 break; 849 case OP_NVERIFY: 850 op->status = nfsd4_verify(rqstp, current_fh, &op->u.nverify); 851 if (op->status == nfserr_not_same) 852 op->status = nfs_ok; 853 break; 854 case OP_OPEN: 855 op->status = nfsd4_open(rqstp, current_fh, &op->u.open, &replay_owner); 856 break; 857 case OP_OPEN_CONFIRM: 858 op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm, &replay_owner); 859 break; 860 case OP_OPEN_DOWNGRADE: 861 op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade, &replay_owner); 862 break; 863 case OP_PUTFH: 864 op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh); 865 break; 866 case OP_PUTROOTFH: 867 op->status = nfsd4_putrootfh(rqstp, current_fh); 868 break; 869 case OP_READ: 870 op->status = nfsd4_read(rqstp, current_fh, &op->u.read); 871 break; 872 case OP_READDIR: 873 op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir); 874 break; 875 case OP_READLINK: 876 op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink); 877 break; 878 case OP_REMOVE: 879 op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove); 880 break; 881 case OP_RENAME: 882 op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename); 883 break; 884 case OP_RENEW: 885 op->status = nfsd4_renew(&op->u.renew); 886 break; 887 case OP_RESTOREFH: 888 op->status = nfsd4_restorefh(current_fh, save_fh); 889 break; 890 case OP_SAVEFH: 891 op->status = nfsd4_savefh(current_fh, save_fh); 892 break; 893 case OP_SETATTR: 894 op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr); 895 break; 896 case OP_SETCLIENTID: 897 op->status = nfsd4_setclientid(rqstp, &op->u.setclientid); 898 break; 899 case OP_SETCLIENTID_CONFIRM: 900 op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm); 901 break; 902 case OP_VERIFY: 903 op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify); 904 if (op->status == nfserr_same) 905 op->status = nfs_ok; 906 break; 907 case OP_WRITE: 908 op->status = nfsd4_write(rqstp, current_fh, &op->u.write); 909 break; 910 case OP_RELEASE_LOCKOWNER: 911 op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner); 912 break; 913 default: 914 BUG_ON(op->status == nfs_ok); 915 break; 916 } 917 918 encode_op: 919 if (op->status == NFSERR_REPLAY_ME) { 920 op->replay = &replay_owner->so_replay; 921 nfsd4_encode_replay(resp, op); 922 status = op->status = op->replay->rp_status; 923 } else { 924 nfsd4_encode_operation(resp, op); 925 status = op->status; 926 } 927 if (replay_owner && (replay_owner != (void *)(-1))) { 928 nfs4_put_stateowner(replay_owner); 929 replay_owner = NULL; 930 } 931 /* XXX Ugh, we need to get rid of this kind of special case: */ 932 if (op->opnum == OP_READ && op->u.read.rd_filp) 933 fput(op->u.read.rd_filp); 934 } 935 936 out: 937 nfsd4_release_compoundargs(args); 938 if (current_fh) 939 fh_put(current_fh); 940 kfree(current_fh); 941 if (save_fh) 942 fh_put(save_fh); 943 kfree(save_fh); 944 return status; 945 } 946 947 #define nfs4svc_decode_voidargs NULL 948 #define nfs4svc_release_void NULL 949 #define nfsd4_voidres nfsd4_voidargs 950 #define nfs4svc_release_compound NULL 951 struct nfsd4_voidargs { int dummy; }; 952 953 #define PROC(name, argt, rest, relt, cache, respsize) \ 954 { (svc_procfunc) nfsd4_proc_##name, \ 955 (kxdrproc_t) nfs4svc_decode_##argt##args, \ 956 (kxdrproc_t) nfs4svc_encode_##rest##res, \ 957 (kxdrproc_t) nfs4svc_release_##relt, \ 958 sizeof(struct nfsd4_##argt##args), \ 959 sizeof(struct nfsd4_##rest##res), \ 960 0, \ 961 cache, \ 962 respsize, \ 963 } 964 965 /* 966 * TODO: At the present time, the NFSv4 server does not do XID caching 967 * of requests. Implementing XID caching would not be a serious problem, 968 * although it would require a mild change in interfaces since one 969 * doesn't know whether an NFSv4 request is idempotent until after the 970 * XDR decode. However, XID caching totally confuses pynfs (Peter 971 * Astrand's regression testsuite for NFSv4 servers), which reuses 972 * XID's liberally, so I've left it unimplemented until pynfs generates 973 * better XID's. 974 */ 975 static struct svc_procedure nfsd_procedures4[2] = { 976 PROC(null, void, void, void, RC_NOCACHE, 1), 977 PROC(compound, compound, compound, compound, RC_NOCACHE, NFSD_BUFSIZE) 978 }; 979 980 struct svc_version nfsd_version4 = { 981 .vs_vers = 4, 982 .vs_nproc = 2, 983 .vs_proc = nfsd_procedures4, 984 .vs_dispatch = nfsd_dispatch, 985 .vs_xdrsize = NFS4_SVC_XDRSIZE, 986 }; 987 988 /* 989 * Local variables: 990 * c-basic-offset: 8 991 * End: 992 */ 993