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 38 #include <linux/param.h> 39 #include <linux/major.h> 40 #include <linux/slab.h> 41 #include <linux/file.h> 42 43 #include <linux/sunrpc/svc.h> 44 #include <linux/nfsd/nfsd.h> 45 #include <linux/nfsd/cache.h> 46 #include <linux/nfs4.h> 47 #include <linux/nfsd/state.h> 48 #include <linux/nfsd/xdr4.h> 49 #include <linux/nfs4_acl.h> 50 #include <linux/sunrpc/gss_api.h> 51 52 #define NFSDDBG_FACILITY NFSDDBG_PROC 53 54 static inline void 55 fh_dup2(struct svc_fh *dst, struct svc_fh *src) 56 { 57 fh_put(dst); 58 dget(src->fh_dentry); 59 if (src->fh_export) 60 cache_get(&src->fh_export->h); 61 *dst = *src; 62 } 63 64 static __be32 65 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode) 66 { 67 __be32 status; 68 69 if (open->op_truncate && 70 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE)) 71 return nfserr_inval; 72 73 if (open->op_share_access & NFS4_SHARE_ACCESS_READ) 74 accmode |= MAY_READ; 75 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) 76 accmode |= (MAY_WRITE | MAY_TRUNC); 77 if (open->op_share_deny & NFS4_SHARE_DENY_WRITE) 78 accmode |= MAY_WRITE; 79 80 status = fh_verify(rqstp, current_fh, S_IFREG, accmode); 81 82 return status; 83 } 84 85 static __be32 86 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) 87 { 88 struct svc_fh resfh; 89 __be32 status; 90 int created = 0; 91 92 fh_init(&resfh, NFS4_FHSIZE); 93 open->op_truncate = 0; 94 95 if (open->op_create) { 96 /* 97 * Note: create modes (UNCHECKED,GUARDED...) are the same 98 * in NFSv4 as in v3. 99 */ 100 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data, 101 open->op_fname.len, &open->op_iattr, 102 &resfh, open->op_createmode, 103 (u32 *)open->op_verf.data, 104 &open->op_truncate, &created); 105 106 /* If we ever decide to use different attrs to store the 107 * verifier in nfsd_create_v3, then we'll need to change this 108 */ 109 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0) 110 open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS | 111 FATTR4_WORD1_TIME_MODIFY); 112 } else { 113 status = nfsd_lookup(rqstp, current_fh, 114 open->op_fname.data, open->op_fname.len, &resfh); 115 fh_unlock(current_fh); 116 } 117 if (status) 118 goto out; 119 120 set_change_info(&open->op_cinfo, current_fh); 121 122 /* set reply cache */ 123 fh_dup2(current_fh, &resfh); 124 open->op_stateowner->so_replay.rp_openfh_len = resfh.fh_handle.fh_size; 125 memcpy(open->op_stateowner->so_replay.rp_openfh, 126 &resfh.fh_handle.fh_base, resfh.fh_handle.fh_size); 127 128 if (!created) 129 status = do_open_permission(rqstp, current_fh, open, MAY_NOP); 130 131 out: 132 fh_put(&resfh); 133 return status; 134 } 135 136 static __be32 137 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) 138 { 139 __be32 status; 140 141 /* Only reclaims from previously confirmed clients are valid */ 142 if ((status = nfs4_check_open_reclaim(&open->op_clientid))) 143 return status; 144 145 /* We don't know the target directory, and therefore can not 146 * set the change info 147 */ 148 149 memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info)); 150 151 /* set replay cache */ 152 open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size; 153 memcpy(open->op_stateowner->so_replay.rp_openfh, 154 ¤t_fh->fh_handle.fh_base, 155 current_fh->fh_handle.fh_size); 156 157 open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) && 158 (open->op_iattr.ia_size == 0); 159 160 status = do_open_permission(rqstp, current_fh, open, MAY_OWNER_OVERRIDE); 161 162 return status; 163 } 164 165 166 static __be32 167 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 168 struct nfsd4_open *open) 169 { 170 __be32 status; 171 dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n", 172 (int)open->op_fname.len, open->op_fname.data, 173 open->op_stateowner); 174 175 /* This check required by spec. */ 176 if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL) 177 return nfserr_inval; 178 179 nfs4_lock_state(); 180 181 /* check seqid for replay. set nfs4_owner */ 182 status = nfsd4_process_open1(open); 183 if (status == nfserr_replay_me) { 184 struct nfs4_replay *rp = &open->op_stateowner->so_replay; 185 fh_put(&cstate->current_fh); 186 cstate->current_fh.fh_handle.fh_size = rp->rp_openfh_len; 187 memcpy(&cstate->current_fh.fh_handle.fh_base, rp->rp_openfh, 188 rp->rp_openfh_len); 189 status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP); 190 if (status) 191 dprintk("nfsd4_open: replay failed" 192 " restoring previous filehandle\n"); 193 else 194 status = nfserr_replay_me; 195 } 196 if (status) 197 goto out; 198 199 /* Openowner is now set, so sequence id will get bumped. Now we need 200 * these checks before we do any creates: */ 201 status = nfserr_grace; 202 if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS) 203 goto out; 204 status = nfserr_no_grace; 205 if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) 206 goto out; 207 208 switch (open->op_claim_type) { 209 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 210 status = nfserr_inval; 211 if (open->op_create) 212 goto out; 213 /* fall through */ 214 case NFS4_OPEN_CLAIM_NULL: 215 /* 216 * (1) set CURRENT_FH to the file being opened, 217 * creating it if necessary, (2) set open->op_cinfo, 218 * (3) set open->op_truncate if the file is to be 219 * truncated after opening, (4) do permission checking. 220 */ 221 status = do_open_lookup(rqstp, &cstate->current_fh, 222 open); 223 if (status) 224 goto out; 225 break; 226 case NFS4_OPEN_CLAIM_PREVIOUS: 227 open->op_stateowner->so_confirmed = 1; 228 /* 229 * The CURRENT_FH is already set to the file being 230 * opened. (1) set open->op_cinfo, (2) set 231 * open->op_truncate if the file is to be truncated 232 * after opening, (3) do permission checking. 233 */ 234 status = do_open_fhandle(rqstp, &cstate->current_fh, 235 open); 236 if (status) 237 goto out; 238 break; 239 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 240 open->op_stateowner->so_confirmed = 1; 241 dprintk("NFSD: unsupported OPEN claim type %d\n", 242 open->op_claim_type); 243 status = nfserr_notsupp; 244 goto out; 245 default: 246 dprintk("NFSD: Invalid OPEN claim type %d\n", 247 open->op_claim_type); 248 status = nfserr_inval; 249 goto out; 250 } 251 /* 252 * nfsd4_process_open2() does the actual opening of the file. If 253 * successful, it (1) truncates the file if open->op_truncate was 254 * set, (2) sets open->op_stateid, (3) sets open->op_delegation. 255 */ 256 status = nfsd4_process_open2(rqstp, &cstate->current_fh, open); 257 out: 258 if (open->op_stateowner) { 259 nfs4_get_stateowner(open->op_stateowner); 260 cstate->replay_owner = open->op_stateowner; 261 } 262 nfs4_unlock_state(); 263 return status; 264 } 265 266 /* 267 * filehandle-manipulating ops. 268 */ 269 static __be32 270 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 271 struct svc_fh **getfh) 272 { 273 if (!cstate->current_fh.fh_dentry) 274 return nfserr_nofilehandle; 275 276 *getfh = &cstate->current_fh; 277 return nfs_ok; 278 } 279 280 static __be32 281 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 282 struct nfsd4_putfh *putfh) 283 { 284 fh_put(&cstate->current_fh); 285 cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen; 286 memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval, 287 putfh->pf_fhlen); 288 return fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP); 289 } 290 291 static __be32 292 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 293 void *arg) 294 { 295 __be32 status; 296 297 fh_put(&cstate->current_fh); 298 status = exp_pseudoroot(rqstp, &cstate->current_fh); 299 return status; 300 } 301 302 static __be32 303 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 304 void *arg) 305 { 306 if (!cstate->save_fh.fh_dentry) 307 return nfserr_restorefh; 308 309 fh_dup2(&cstate->current_fh, &cstate->save_fh); 310 return nfs_ok; 311 } 312 313 static __be32 314 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 315 void *arg) 316 { 317 if (!cstate->current_fh.fh_dentry) 318 return nfserr_nofilehandle; 319 320 fh_dup2(&cstate->save_fh, &cstate->current_fh); 321 return nfs_ok; 322 } 323 324 /* 325 * misc nfsv4 ops 326 */ 327 static __be32 328 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 329 struct nfsd4_access *access) 330 { 331 if (access->ac_req_access & ~NFS3_ACCESS_FULL) 332 return nfserr_inval; 333 334 access->ac_resp_access = access->ac_req_access; 335 return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access, 336 &access->ac_supported); 337 } 338 339 static __be32 340 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 341 struct nfsd4_commit *commit) 342 { 343 __be32 status; 344 345 u32 *p = (u32 *)commit->co_verf.data; 346 *p++ = nfssvc_boot.tv_sec; 347 *p++ = nfssvc_boot.tv_usec; 348 349 status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset, 350 commit->co_count); 351 if (status == nfserr_symlink) 352 status = nfserr_inval; 353 return status; 354 } 355 356 static __be32 357 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 358 struct nfsd4_create *create) 359 { 360 struct svc_fh resfh; 361 __be32 status; 362 dev_t rdev; 363 364 fh_init(&resfh, NFS4_FHSIZE); 365 366 status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, MAY_CREATE); 367 if (status == nfserr_symlink) 368 status = nfserr_notdir; 369 if (status) 370 return status; 371 372 switch (create->cr_type) { 373 case NF4LNK: 374 /* ugh! we have to null-terminate the linktext, or 375 * vfs_symlink() will choke. it is always safe to 376 * null-terminate by brute force, since at worst we 377 * will overwrite the first byte of the create namelen 378 * in the XDR buffer, which has already been extracted 379 * during XDR decode. 380 */ 381 create->cr_linkname[create->cr_linklen] = 0; 382 383 status = nfsd_symlink(rqstp, &cstate->current_fh, 384 create->cr_name, create->cr_namelen, 385 create->cr_linkname, create->cr_linklen, 386 &resfh, &create->cr_iattr); 387 break; 388 389 case NF4BLK: 390 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2); 391 if (MAJOR(rdev) != create->cr_specdata1 || 392 MINOR(rdev) != create->cr_specdata2) 393 return nfserr_inval; 394 status = nfsd_create(rqstp, &cstate->current_fh, 395 create->cr_name, create->cr_namelen, 396 &create->cr_iattr, S_IFBLK, rdev, &resfh); 397 break; 398 399 case NF4CHR: 400 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2); 401 if (MAJOR(rdev) != create->cr_specdata1 || 402 MINOR(rdev) != create->cr_specdata2) 403 return nfserr_inval; 404 status = nfsd_create(rqstp, &cstate->current_fh, 405 create->cr_name, create->cr_namelen, 406 &create->cr_iattr,S_IFCHR, rdev, &resfh); 407 break; 408 409 case NF4SOCK: 410 status = nfsd_create(rqstp, &cstate->current_fh, 411 create->cr_name, create->cr_namelen, 412 &create->cr_iattr, S_IFSOCK, 0, &resfh); 413 break; 414 415 case NF4FIFO: 416 status = nfsd_create(rqstp, &cstate->current_fh, 417 create->cr_name, create->cr_namelen, 418 &create->cr_iattr, S_IFIFO, 0, &resfh); 419 break; 420 421 case NF4DIR: 422 create->cr_iattr.ia_valid &= ~ATTR_SIZE; 423 status = nfsd_create(rqstp, &cstate->current_fh, 424 create->cr_name, create->cr_namelen, 425 &create->cr_iattr, S_IFDIR, 0, &resfh); 426 break; 427 428 default: 429 status = nfserr_badtype; 430 } 431 432 if (!status) { 433 fh_unlock(&cstate->current_fh); 434 set_change_info(&create->cr_cinfo, &cstate->current_fh); 435 fh_dup2(&cstate->current_fh, &resfh); 436 } 437 438 fh_put(&resfh); 439 return status; 440 } 441 442 static __be32 443 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 444 struct nfsd4_getattr *getattr) 445 { 446 __be32 status; 447 448 status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP); 449 if (status) 450 return status; 451 452 if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1) 453 return nfserr_inval; 454 455 getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0; 456 getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1; 457 458 getattr->ga_fhp = &cstate->current_fh; 459 return nfs_ok; 460 } 461 462 static __be32 463 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 464 struct nfsd4_link *link) 465 { 466 __be32 status = nfserr_nofilehandle; 467 468 if (!cstate->save_fh.fh_dentry) 469 return status; 470 status = nfsd_link(rqstp, &cstate->current_fh, 471 link->li_name, link->li_namelen, &cstate->save_fh); 472 if (!status) 473 set_change_info(&link->li_cinfo, &cstate->current_fh); 474 return status; 475 } 476 477 static __be32 478 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 479 void *arg) 480 { 481 struct svc_fh tmp_fh; 482 __be32 ret; 483 484 fh_init(&tmp_fh, NFS4_FHSIZE); 485 ret = exp_pseudoroot(rqstp, &tmp_fh); 486 if (ret) 487 return ret; 488 if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) { 489 fh_put(&tmp_fh); 490 return nfserr_noent; 491 } 492 fh_put(&tmp_fh); 493 return nfsd_lookup(rqstp, &cstate->current_fh, 494 "..", 2, &cstate->current_fh); 495 } 496 497 static __be32 498 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 499 struct nfsd4_lookup *lookup) 500 { 501 return nfsd_lookup(rqstp, &cstate->current_fh, 502 lookup->lo_name, lookup->lo_len, 503 &cstate->current_fh); 504 } 505 506 static __be32 507 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 508 struct nfsd4_read *read) 509 { 510 __be32 status; 511 512 /* no need to check permission - this will be done in nfsd_read() */ 513 514 read->rd_filp = NULL; 515 if (read->rd_offset >= OFFSET_MAX) 516 return nfserr_inval; 517 518 nfs4_lock_state(); 519 /* check stateid */ 520 if ((status = nfs4_preprocess_stateid_op(&cstate->current_fh, 521 &read->rd_stateid, 522 CHECK_FH | RD_STATE, &read->rd_filp))) { 523 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n"); 524 goto out; 525 } 526 if (read->rd_filp) 527 get_file(read->rd_filp); 528 status = nfs_ok; 529 out: 530 nfs4_unlock_state(); 531 read->rd_rqstp = rqstp; 532 read->rd_fhp = &cstate->current_fh; 533 return status; 534 } 535 536 static __be32 537 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 538 struct nfsd4_readdir *readdir) 539 { 540 u64 cookie = readdir->rd_cookie; 541 static const nfs4_verifier zeroverf; 542 543 /* no need to check permission - this will be done in nfsd_readdir() */ 544 545 if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1) 546 return nfserr_inval; 547 548 readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0; 549 readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1; 550 551 if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) || 552 (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE))) 553 return nfserr_bad_cookie; 554 555 readdir->rd_rqstp = rqstp; 556 readdir->rd_fhp = &cstate->current_fh; 557 return nfs_ok; 558 } 559 560 static __be32 561 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 562 struct nfsd4_readlink *readlink) 563 { 564 readlink->rl_rqstp = rqstp; 565 readlink->rl_fhp = &cstate->current_fh; 566 return nfs_ok; 567 } 568 569 static __be32 570 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 571 struct nfsd4_remove *remove) 572 { 573 __be32 status; 574 575 if (nfs4_in_grace()) 576 return nfserr_grace; 577 status = nfsd_unlink(rqstp, &cstate->current_fh, 0, 578 remove->rm_name, remove->rm_namelen); 579 if (status == nfserr_symlink) 580 return nfserr_notdir; 581 if (!status) { 582 fh_unlock(&cstate->current_fh); 583 set_change_info(&remove->rm_cinfo, &cstate->current_fh); 584 } 585 return status; 586 } 587 588 static __be32 589 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 590 struct nfsd4_rename *rename) 591 { 592 __be32 status = nfserr_nofilehandle; 593 594 if (!cstate->save_fh.fh_dentry) 595 return status; 596 if (nfs4_in_grace() && !(cstate->save_fh.fh_export->ex_flags 597 & NFSEXP_NOSUBTREECHECK)) 598 return nfserr_grace; 599 status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname, 600 rename->rn_snamelen, &cstate->current_fh, 601 rename->rn_tname, rename->rn_tnamelen); 602 603 /* the underlying filesystem returns different error's than required 604 * by NFSv4. both save_fh and current_fh have been verified.. */ 605 if (status == nfserr_isdir) 606 status = nfserr_exist; 607 else if ((status == nfserr_notdir) && 608 (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) && 609 S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode))) 610 status = nfserr_exist; 611 else if (status == nfserr_symlink) 612 status = nfserr_notdir; 613 614 if (!status) { 615 set_change_info(&rename->rn_sinfo, &cstate->current_fh); 616 set_change_info(&rename->rn_tinfo, &cstate->save_fh); 617 } 618 return status; 619 } 620 621 static __be32 622 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 623 struct nfsd4_secinfo *secinfo) 624 { 625 struct svc_fh resfh; 626 struct svc_export *exp; 627 struct dentry *dentry; 628 __be32 err; 629 630 fh_init(&resfh, NFS4_FHSIZE); 631 err = nfsd_lookup_dentry(rqstp, &cstate->current_fh, 632 secinfo->si_name, secinfo->si_namelen, 633 &exp, &dentry); 634 if (err) 635 return err; 636 if (dentry->d_inode == NULL) { 637 exp_put(exp); 638 err = nfserr_noent; 639 } else 640 secinfo->si_exp = exp; 641 dput(dentry); 642 return err; 643 } 644 645 static __be32 646 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 647 struct nfsd4_setattr *setattr) 648 { 649 __be32 status = nfs_ok; 650 651 if (setattr->sa_iattr.ia_valid & ATTR_SIZE) { 652 nfs4_lock_state(); 653 status = nfs4_preprocess_stateid_op(&cstate->current_fh, 654 &setattr->sa_stateid, CHECK_FH | WR_STATE, NULL); 655 nfs4_unlock_state(); 656 if (status) { 657 dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n"); 658 return status; 659 } 660 } 661 status = nfs_ok; 662 if (setattr->sa_acl != NULL) 663 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh, 664 setattr->sa_acl); 665 if (status) 666 return status; 667 status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr, 668 0, (time_t)0); 669 return status; 670 } 671 672 static __be32 673 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 674 struct nfsd4_write *write) 675 { 676 stateid_t *stateid = &write->wr_stateid; 677 struct file *filp = NULL; 678 u32 *p; 679 __be32 status = nfs_ok; 680 681 /* no need to check permission - this will be done in nfsd_write() */ 682 683 if (write->wr_offset >= OFFSET_MAX) 684 return nfserr_inval; 685 686 nfs4_lock_state(); 687 status = nfs4_preprocess_stateid_op(&cstate->current_fh, stateid, 688 CHECK_FH | WR_STATE, &filp); 689 if (filp) 690 get_file(filp); 691 nfs4_unlock_state(); 692 693 if (status) { 694 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n"); 695 return status; 696 } 697 698 write->wr_bytes_written = write->wr_buflen; 699 write->wr_how_written = write->wr_stable_how; 700 p = (u32 *)write->wr_verifier.data; 701 *p++ = nfssvc_boot.tv_sec; 702 *p++ = nfssvc_boot.tv_usec; 703 704 status = nfsd_write(rqstp, &cstate->current_fh, filp, 705 write->wr_offset, rqstp->rq_vec, write->wr_vlen, 706 write->wr_buflen, &write->wr_how_written); 707 if (filp) 708 fput(filp); 709 710 if (status == nfserr_symlink) 711 status = nfserr_inval; 712 return status; 713 } 714 715 /* This routine never returns NFS_OK! If there are no other errors, it 716 * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the 717 * attributes matched. VERIFY is implemented by mapping NFSERR_SAME 718 * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK. 719 */ 720 static __be32 721 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 722 struct nfsd4_verify *verify) 723 { 724 __be32 *buf, *p; 725 int count; 726 __be32 status; 727 728 status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP); 729 if (status) 730 return status; 731 732 if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) 733 || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1)) 734 return nfserr_attrnotsupp; 735 if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR) 736 || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)) 737 return nfserr_inval; 738 if (verify->ve_attrlen & 3) 739 return nfserr_inval; 740 741 /* count in words: 742 * bitmap_len(1) + bitmap(2) + attr_len(1) = 4 743 */ 744 count = 4 + (verify->ve_attrlen >> 2); 745 buf = kmalloc(count << 2, GFP_KERNEL); 746 if (!buf) 747 return nfserr_resource; 748 749 status = nfsd4_encode_fattr(&cstate->current_fh, 750 cstate->current_fh.fh_export, 751 cstate->current_fh.fh_dentry, buf, 752 &count, verify->ve_bmval, 753 rqstp, 0); 754 755 /* this means that nfsd4_encode_fattr() ran out of space */ 756 if (status == nfserr_resource && count == 0) 757 status = nfserr_not_same; 758 if (status) 759 goto out_kfree; 760 761 p = buf + 3; 762 status = nfserr_not_same; 763 if (ntohl(*p++) != verify->ve_attrlen) 764 goto out_kfree; 765 if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen)) 766 status = nfserr_same; 767 768 out_kfree: 769 kfree(buf); 770 return status; 771 } 772 773 static __be32 774 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 775 struct nfsd4_verify *verify) 776 { 777 __be32 status; 778 779 status = _nfsd4_verify(rqstp, cstate, verify); 780 return status == nfserr_not_same ? nfs_ok : status; 781 } 782 783 static __be32 784 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 785 struct nfsd4_verify *verify) 786 { 787 __be32 status; 788 789 status = _nfsd4_verify(rqstp, cstate, verify); 790 return status == nfserr_same ? nfs_ok : status; 791 } 792 793 /* 794 * NULL call. 795 */ 796 static __be32 797 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 798 { 799 return nfs_ok; 800 } 801 802 static inline void nfsd4_increment_op_stats(u32 opnum) 803 { 804 if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP) 805 nfsdstats.nfs4_opcount[opnum]++; 806 } 807 808 static void cstate_free(struct nfsd4_compound_state *cstate) 809 { 810 if (cstate == NULL) 811 return; 812 fh_put(&cstate->current_fh); 813 fh_put(&cstate->save_fh); 814 BUG_ON(cstate->replay_owner); 815 kfree(cstate); 816 } 817 818 static struct nfsd4_compound_state *cstate_alloc(void) 819 { 820 struct nfsd4_compound_state *cstate; 821 822 cstate = kmalloc(sizeof(struct nfsd4_compound_state), GFP_KERNEL); 823 if (cstate == NULL) 824 return NULL; 825 fh_init(&cstate->current_fh, NFS4_FHSIZE); 826 fh_init(&cstate->save_fh, NFS4_FHSIZE); 827 cstate->replay_owner = NULL; 828 return cstate; 829 } 830 831 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *, 832 void *); 833 834 struct nfsd4_operation { 835 nfsd4op_func op_func; 836 u32 op_flags; 837 /* Most ops require a valid current filehandle; a few don't: */ 838 #define ALLOWED_WITHOUT_FH 1 839 /* GETATTR and ops not listed as returning NFS4ERR_MOVED: */ 840 #define ALLOWED_ON_ABSENT_FS 2 841 }; 842 843 static struct nfsd4_operation nfsd4_ops[]; 844 845 /* 846 * COMPOUND call. 847 */ 848 static __be32 849 nfsd4_proc_compound(struct svc_rqst *rqstp, 850 struct nfsd4_compoundargs *args, 851 struct nfsd4_compoundres *resp) 852 { 853 struct nfsd4_op *op; 854 struct nfsd4_operation *opdesc; 855 struct nfsd4_compound_state *cstate = NULL; 856 int slack_bytes; 857 __be32 status; 858 859 status = nfserr_resource; 860 cstate = cstate_alloc(); 861 if (cstate == NULL) 862 goto out; 863 864 resp->xbuf = &rqstp->rq_res; 865 resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len; 866 resp->tagp = resp->p; 867 /* reserve space for: taglen, tag, and opcnt */ 868 resp->p += 2 + XDR_QUADLEN(args->taglen); 869 resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE; 870 resp->taglen = args->taglen; 871 resp->tag = args->tag; 872 resp->opcnt = 0; 873 resp->rqstp = rqstp; 874 875 /* 876 * According to RFC3010, this takes precedence over all other errors. 877 */ 878 status = nfserr_minor_vers_mismatch; 879 if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION) 880 goto out; 881 882 status = nfs_ok; 883 while (!status && resp->opcnt < args->opcnt) { 884 op = &args->ops[resp->opcnt++]; 885 886 dprintk("nfsv4 compound op #%d: %d\n", resp->opcnt, op->opnum); 887 888 /* 889 * The XDR decode routines may have pre-set op->status; 890 * for example, if there is a miscellaneous XDR error 891 * it will be set to nfserr_bad_xdr. 892 */ 893 if (op->status) 894 goto encode_op; 895 896 /* We must be able to encode a successful response to 897 * this operation, with enough room left over to encode a 898 * failed response to the next operation. If we don't 899 * have enough room, fail with ERR_RESOURCE. 900 */ 901 slack_bytes = (char *)resp->end - (char *)resp->p; 902 if (slack_bytes < COMPOUND_SLACK_SPACE 903 + COMPOUND_ERR_SLACK_SPACE) { 904 BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE); 905 op->status = nfserr_resource; 906 goto encode_op; 907 } 908 909 opdesc = &nfsd4_ops[op->opnum]; 910 911 if (!cstate->current_fh.fh_dentry) { 912 if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) { 913 op->status = nfserr_nofilehandle; 914 goto encode_op; 915 } 916 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated && 917 !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) { 918 op->status = nfserr_moved; 919 goto encode_op; 920 } 921 922 if (opdesc->op_func) 923 op->status = opdesc->op_func(rqstp, cstate, &op->u); 924 else 925 BUG_ON(op->status == nfs_ok); 926 927 encode_op: 928 if (op->status == nfserr_replay_me) { 929 op->replay = &cstate->replay_owner->so_replay; 930 nfsd4_encode_replay(resp, op); 931 status = op->status = op->replay->rp_status; 932 } else { 933 nfsd4_encode_operation(resp, op); 934 status = op->status; 935 } 936 if (cstate->replay_owner) { 937 nfs4_put_stateowner(cstate->replay_owner); 938 cstate->replay_owner = NULL; 939 } 940 /* XXX Ugh, we need to get rid of this kind of special case: */ 941 if (op->opnum == OP_READ && op->u.read.rd_filp) 942 fput(op->u.read.rd_filp); 943 944 nfsd4_increment_op_stats(op->opnum); 945 } 946 947 out: 948 nfsd4_release_compoundargs(args); 949 cstate_free(cstate); 950 return status; 951 } 952 953 static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = { 954 [OP_ACCESS] = { 955 .op_func = (nfsd4op_func)nfsd4_access, 956 }, 957 [OP_CLOSE] = { 958 .op_func = (nfsd4op_func)nfsd4_close, 959 }, 960 [OP_COMMIT] = { 961 .op_func = (nfsd4op_func)nfsd4_commit, 962 }, 963 [OP_CREATE] = { 964 .op_func = (nfsd4op_func)nfsd4_create, 965 }, 966 [OP_DELEGRETURN] = { 967 .op_func = (nfsd4op_func)nfsd4_delegreturn, 968 }, 969 [OP_GETATTR] = { 970 .op_func = (nfsd4op_func)nfsd4_getattr, 971 .op_flags = ALLOWED_ON_ABSENT_FS, 972 }, 973 [OP_GETFH] = { 974 .op_func = (nfsd4op_func)nfsd4_getfh, 975 }, 976 [OP_LINK] = { 977 .op_func = (nfsd4op_func)nfsd4_link, 978 }, 979 [OP_LOCK] = { 980 .op_func = (nfsd4op_func)nfsd4_lock, 981 }, 982 [OP_LOCKT] = { 983 .op_func = (nfsd4op_func)nfsd4_lockt, 984 }, 985 [OP_LOCKU] = { 986 .op_func = (nfsd4op_func)nfsd4_locku, 987 }, 988 [OP_LOOKUP] = { 989 .op_func = (nfsd4op_func)nfsd4_lookup, 990 }, 991 [OP_LOOKUPP] = { 992 .op_func = (nfsd4op_func)nfsd4_lookupp, 993 }, 994 [OP_NVERIFY] = { 995 .op_func = (nfsd4op_func)nfsd4_nverify, 996 }, 997 [OP_OPEN] = { 998 .op_func = (nfsd4op_func)nfsd4_open, 999 }, 1000 [OP_OPEN_CONFIRM] = { 1001 .op_func = (nfsd4op_func)nfsd4_open_confirm, 1002 }, 1003 [OP_OPEN_DOWNGRADE] = { 1004 .op_func = (nfsd4op_func)nfsd4_open_downgrade, 1005 }, 1006 [OP_PUTFH] = { 1007 .op_func = (nfsd4op_func)nfsd4_putfh, 1008 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1009 }, 1010 [OP_PUTPUBFH] = { 1011 /* unsupported; just for future reference: */ 1012 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1013 }, 1014 [OP_PUTROOTFH] = { 1015 .op_func = (nfsd4op_func)nfsd4_putrootfh, 1016 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1017 }, 1018 [OP_READ] = { 1019 .op_func = (nfsd4op_func)nfsd4_read, 1020 }, 1021 [OP_READDIR] = { 1022 .op_func = (nfsd4op_func)nfsd4_readdir, 1023 }, 1024 [OP_READLINK] = { 1025 .op_func = (nfsd4op_func)nfsd4_readlink, 1026 }, 1027 [OP_REMOVE] = { 1028 .op_func = (nfsd4op_func)nfsd4_remove, 1029 }, 1030 [OP_RENAME] = { 1031 .op_func = (nfsd4op_func)nfsd4_rename, 1032 }, 1033 [OP_RENEW] = { 1034 .op_func = (nfsd4op_func)nfsd4_renew, 1035 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1036 }, 1037 [OP_RESTOREFH] = { 1038 .op_func = (nfsd4op_func)nfsd4_restorefh, 1039 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1040 }, 1041 [OP_SAVEFH] = { 1042 .op_func = (nfsd4op_func)nfsd4_savefh, 1043 }, 1044 [OP_SECINFO] = { 1045 .op_func = (nfsd4op_func)nfsd4_secinfo, 1046 }, 1047 [OP_SETATTR] = { 1048 .op_func = (nfsd4op_func)nfsd4_setattr, 1049 }, 1050 [OP_SETCLIENTID] = { 1051 .op_func = (nfsd4op_func)nfsd4_setclientid, 1052 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1053 }, 1054 [OP_SETCLIENTID_CONFIRM] = { 1055 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm, 1056 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1057 }, 1058 [OP_VERIFY] = { 1059 .op_func = (nfsd4op_func)nfsd4_verify, 1060 }, 1061 [OP_WRITE] = { 1062 .op_func = (nfsd4op_func)nfsd4_write, 1063 }, 1064 [OP_RELEASE_LOCKOWNER] = { 1065 .op_func = (nfsd4op_func)nfsd4_release_lockowner, 1066 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1067 }, 1068 }; 1069 1070 #define nfs4svc_decode_voidargs NULL 1071 #define nfs4svc_release_void NULL 1072 #define nfsd4_voidres nfsd4_voidargs 1073 #define nfs4svc_release_compound NULL 1074 struct nfsd4_voidargs { int dummy; }; 1075 1076 #define PROC(name, argt, rest, relt, cache, respsize) \ 1077 { (svc_procfunc) nfsd4_proc_##name, \ 1078 (kxdrproc_t) nfs4svc_decode_##argt##args, \ 1079 (kxdrproc_t) nfs4svc_encode_##rest##res, \ 1080 (kxdrproc_t) nfs4svc_release_##relt, \ 1081 sizeof(struct nfsd4_##argt##args), \ 1082 sizeof(struct nfsd4_##rest##res), \ 1083 0, \ 1084 cache, \ 1085 respsize, \ 1086 } 1087 1088 /* 1089 * TODO: At the present time, the NFSv4 server does not do XID caching 1090 * of requests. Implementing XID caching would not be a serious problem, 1091 * although it would require a mild change in interfaces since one 1092 * doesn't know whether an NFSv4 request is idempotent until after the 1093 * XDR decode. However, XID caching totally confuses pynfs (Peter 1094 * Astrand's regression testsuite for NFSv4 servers), which reuses 1095 * XID's liberally, so I've left it unimplemented until pynfs generates 1096 * better XID's. 1097 */ 1098 static struct svc_procedure nfsd_procedures4[2] = { 1099 PROC(null, void, void, void, RC_NOCACHE, 1), 1100 PROC(compound, compound, compound, compound, RC_NOCACHE, NFSD_BUFSIZE/4) 1101 }; 1102 1103 struct svc_version nfsd_version4 = { 1104 .vs_vers = 4, 1105 .vs_nproc = 2, 1106 .vs_proc = nfsd_procedures4, 1107 .vs_dispatch = nfsd_dispatch, 1108 .vs_xdrsize = NFS4_SVC_XDRSIZE, 1109 }; 1110 1111 /* 1112 * Local variables: 1113 * c-basic-offset: 8 1114 * End: 1115 */ 1116