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 = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt); 662 if (status) 663 return status; 664 status = nfs_ok; 665 if (setattr->sa_acl != NULL) 666 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh, 667 setattr->sa_acl); 668 if (status) 669 goto out; 670 status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr, 671 0, (time_t)0); 672 out: 673 mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt); 674 return status; 675 } 676 677 static __be32 678 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 679 struct nfsd4_write *write) 680 { 681 stateid_t *stateid = &write->wr_stateid; 682 struct file *filp = NULL; 683 u32 *p; 684 __be32 status = nfs_ok; 685 686 /* no need to check permission - this will be done in nfsd_write() */ 687 688 if (write->wr_offset >= OFFSET_MAX) 689 return nfserr_inval; 690 691 nfs4_lock_state(); 692 status = nfs4_preprocess_stateid_op(&cstate->current_fh, stateid, 693 CHECK_FH | WR_STATE, &filp); 694 if (filp) 695 get_file(filp); 696 nfs4_unlock_state(); 697 698 if (status) { 699 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n"); 700 return status; 701 } 702 703 write->wr_bytes_written = write->wr_buflen; 704 write->wr_how_written = write->wr_stable_how; 705 p = (u32 *)write->wr_verifier.data; 706 *p++ = nfssvc_boot.tv_sec; 707 *p++ = nfssvc_boot.tv_usec; 708 709 status = nfsd_write(rqstp, &cstate->current_fh, filp, 710 write->wr_offset, rqstp->rq_vec, write->wr_vlen, 711 write->wr_buflen, &write->wr_how_written); 712 if (filp) 713 fput(filp); 714 715 if (status == nfserr_symlink) 716 status = nfserr_inval; 717 return status; 718 } 719 720 /* This routine never returns NFS_OK! If there are no other errors, it 721 * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the 722 * attributes matched. VERIFY is implemented by mapping NFSERR_SAME 723 * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK. 724 */ 725 static __be32 726 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 727 struct nfsd4_verify *verify) 728 { 729 __be32 *buf, *p; 730 int count; 731 __be32 status; 732 733 status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP); 734 if (status) 735 return status; 736 737 if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) 738 || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1)) 739 return nfserr_attrnotsupp; 740 if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR) 741 || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)) 742 return nfserr_inval; 743 if (verify->ve_attrlen & 3) 744 return nfserr_inval; 745 746 /* count in words: 747 * bitmap_len(1) + bitmap(2) + attr_len(1) = 4 748 */ 749 count = 4 + (verify->ve_attrlen >> 2); 750 buf = kmalloc(count << 2, GFP_KERNEL); 751 if (!buf) 752 return nfserr_resource; 753 754 status = nfsd4_encode_fattr(&cstate->current_fh, 755 cstate->current_fh.fh_export, 756 cstate->current_fh.fh_dentry, buf, 757 &count, verify->ve_bmval, 758 rqstp, 0); 759 760 /* this means that nfsd4_encode_fattr() ran out of space */ 761 if (status == nfserr_resource && count == 0) 762 status = nfserr_not_same; 763 if (status) 764 goto out_kfree; 765 766 p = buf + 3; 767 status = nfserr_not_same; 768 if (ntohl(*p++) != verify->ve_attrlen) 769 goto out_kfree; 770 if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen)) 771 status = nfserr_same; 772 773 out_kfree: 774 kfree(buf); 775 return status; 776 } 777 778 static __be32 779 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 780 struct nfsd4_verify *verify) 781 { 782 __be32 status; 783 784 status = _nfsd4_verify(rqstp, cstate, verify); 785 return status == nfserr_not_same ? nfs_ok : status; 786 } 787 788 static __be32 789 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 790 struct nfsd4_verify *verify) 791 { 792 __be32 status; 793 794 status = _nfsd4_verify(rqstp, cstate, verify); 795 return status == nfserr_same ? nfs_ok : status; 796 } 797 798 /* 799 * NULL call. 800 */ 801 static __be32 802 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 803 { 804 return nfs_ok; 805 } 806 807 static inline void nfsd4_increment_op_stats(u32 opnum) 808 { 809 if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP) 810 nfsdstats.nfs4_opcount[opnum]++; 811 } 812 813 static void cstate_free(struct nfsd4_compound_state *cstate) 814 { 815 if (cstate == NULL) 816 return; 817 fh_put(&cstate->current_fh); 818 fh_put(&cstate->save_fh); 819 BUG_ON(cstate->replay_owner); 820 kfree(cstate); 821 } 822 823 static struct nfsd4_compound_state *cstate_alloc(void) 824 { 825 struct nfsd4_compound_state *cstate; 826 827 cstate = kmalloc(sizeof(struct nfsd4_compound_state), GFP_KERNEL); 828 if (cstate == NULL) 829 return NULL; 830 fh_init(&cstate->current_fh, NFS4_FHSIZE); 831 fh_init(&cstate->save_fh, NFS4_FHSIZE); 832 cstate->replay_owner = NULL; 833 return cstate; 834 } 835 836 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *, 837 void *); 838 839 struct nfsd4_operation { 840 nfsd4op_func op_func; 841 u32 op_flags; 842 /* Most ops require a valid current filehandle; a few don't: */ 843 #define ALLOWED_WITHOUT_FH 1 844 /* GETATTR and ops not listed as returning NFS4ERR_MOVED: */ 845 #define ALLOWED_ON_ABSENT_FS 2 846 }; 847 848 static struct nfsd4_operation nfsd4_ops[]; 849 850 /* 851 * COMPOUND call. 852 */ 853 static __be32 854 nfsd4_proc_compound(struct svc_rqst *rqstp, 855 struct nfsd4_compoundargs *args, 856 struct nfsd4_compoundres *resp) 857 { 858 struct nfsd4_op *op; 859 struct nfsd4_operation *opdesc; 860 struct nfsd4_compound_state *cstate = NULL; 861 int slack_bytes; 862 __be32 status; 863 864 status = nfserr_resource; 865 cstate = cstate_alloc(); 866 if (cstate == NULL) 867 goto out; 868 869 resp->xbuf = &rqstp->rq_res; 870 resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len; 871 resp->tagp = resp->p; 872 /* reserve space for: taglen, tag, and opcnt */ 873 resp->p += 2 + XDR_QUADLEN(args->taglen); 874 resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE; 875 resp->taglen = args->taglen; 876 resp->tag = args->tag; 877 resp->opcnt = 0; 878 resp->rqstp = rqstp; 879 880 /* 881 * According to RFC3010, this takes precedence over all other errors. 882 */ 883 status = nfserr_minor_vers_mismatch; 884 if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION) 885 goto out; 886 887 status = nfs_ok; 888 while (!status && resp->opcnt < args->opcnt) { 889 op = &args->ops[resp->opcnt++]; 890 891 dprintk("nfsv4 compound op #%d: %d\n", resp->opcnt, op->opnum); 892 893 /* 894 * The XDR decode routines may have pre-set op->status; 895 * for example, if there is a miscellaneous XDR error 896 * it will be set to nfserr_bad_xdr. 897 */ 898 if (op->status) 899 goto encode_op; 900 901 /* We must be able to encode a successful response to 902 * this operation, with enough room left over to encode a 903 * failed response to the next operation. If we don't 904 * have enough room, fail with ERR_RESOURCE. 905 */ 906 slack_bytes = (char *)resp->end - (char *)resp->p; 907 if (slack_bytes < COMPOUND_SLACK_SPACE 908 + COMPOUND_ERR_SLACK_SPACE) { 909 BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE); 910 op->status = nfserr_resource; 911 goto encode_op; 912 } 913 914 opdesc = &nfsd4_ops[op->opnum]; 915 916 if (!cstate->current_fh.fh_dentry) { 917 if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) { 918 op->status = nfserr_nofilehandle; 919 goto encode_op; 920 } 921 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated && 922 !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) { 923 op->status = nfserr_moved; 924 goto encode_op; 925 } 926 927 if (opdesc->op_func) 928 op->status = opdesc->op_func(rqstp, cstate, &op->u); 929 else 930 BUG_ON(op->status == nfs_ok); 931 932 encode_op: 933 if (op->status == nfserr_replay_me) { 934 op->replay = &cstate->replay_owner->so_replay; 935 nfsd4_encode_replay(resp, op); 936 status = op->status = op->replay->rp_status; 937 } else { 938 nfsd4_encode_operation(resp, op); 939 status = op->status; 940 } 941 if (cstate->replay_owner) { 942 nfs4_put_stateowner(cstate->replay_owner); 943 cstate->replay_owner = NULL; 944 } 945 /* XXX Ugh, we need to get rid of this kind of special case: */ 946 if (op->opnum == OP_READ && op->u.read.rd_filp) 947 fput(op->u.read.rd_filp); 948 949 nfsd4_increment_op_stats(op->opnum); 950 } 951 952 out: 953 nfsd4_release_compoundargs(args); 954 cstate_free(cstate); 955 return status; 956 } 957 958 static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = { 959 [OP_ACCESS] = { 960 .op_func = (nfsd4op_func)nfsd4_access, 961 }, 962 [OP_CLOSE] = { 963 .op_func = (nfsd4op_func)nfsd4_close, 964 }, 965 [OP_COMMIT] = { 966 .op_func = (nfsd4op_func)nfsd4_commit, 967 }, 968 [OP_CREATE] = { 969 .op_func = (nfsd4op_func)nfsd4_create, 970 }, 971 [OP_DELEGRETURN] = { 972 .op_func = (nfsd4op_func)nfsd4_delegreturn, 973 }, 974 [OP_GETATTR] = { 975 .op_func = (nfsd4op_func)nfsd4_getattr, 976 .op_flags = ALLOWED_ON_ABSENT_FS, 977 }, 978 [OP_GETFH] = { 979 .op_func = (nfsd4op_func)nfsd4_getfh, 980 }, 981 [OP_LINK] = { 982 .op_func = (nfsd4op_func)nfsd4_link, 983 }, 984 [OP_LOCK] = { 985 .op_func = (nfsd4op_func)nfsd4_lock, 986 }, 987 [OP_LOCKT] = { 988 .op_func = (nfsd4op_func)nfsd4_lockt, 989 }, 990 [OP_LOCKU] = { 991 .op_func = (nfsd4op_func)nfsd4_locku, 992 }, 993 [OP_LOOKUP] = { 994 .op_func = (nfsd4op_func)nfsd4_lookup, 995 }, 996 [OP_LOOKUPP] = { 997 .op_func = (nfsd4op_func)nfsd4_lookupp, 998 }, 999 [OP_NVERIFY] = { 1000 .op_func = (nfsd4op_func)nfsd4_nverify, 1001 }, 1002 [OP_OPEN] = { 1003 .op_func = (nfsd4op_func)nfsd4_open, 1004 }, 1005 [OP_OPEN_CONFIRM] = { 1006 .op_func = (nfsd4op_func)nfsd4_open_confirm, 1007 }, 1008 [OP_OPEN_DOWNGRADE] = { 1009 .op_func = (nfsd4op_func)nfsd4_open_downgrade, 1010 }, 1011 [OP_PUTFH] = { 1012 .op_func = (nfsd4op_func)nfsd4_putfh, 1013 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1014 }, 1015 [OP_PUTPUBFH] = { 1016 /* unsupported; just for future reference: */ 1017 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1018 }, 1019 [OP_PUTROOTFH] = { 1020 .op_func = (nfsd4op_func)nfsd4_putrootfh, 1021 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1022 }, 1023 [OP_READ] = { 1024 .op_func = (nfsd4op_func)nfsd4_read, 1025 }, 1026 [OP_READDIR] = { 1027 .op_func = (nfsd4op_func)nfsd4_readdir, 1028 }, 1029 [OP_READLINK] = { 1030 .op_func = (nfsd4op_func)nfsd4_readlink, 1031 }, 1032 [OP_REMOVE] = { 1033 .op_func = (nfsd4op_func)nfsd4_remove, 1034 }, 1035 [OP_RENAME] = { 1036 .op_func = (nfsd4op_func)nfsd4_rename, 1037 }, 1038 [OP_RENEW] = { 1039 .op_func = (nfsd4op_func)nfsd4_renew, 1040 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1041 }, 1042 [OP_RESTOREFH] = { 1043 .op_func = (nfsd4op_func)nfsd4_restorefh, 1044 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1045 }, 1046 [OP_SAVEFH] = { 1047 .op_func = (nfsd4op_func)nfsd4_savefh, 1048 }, 1049 [OP_SECINFO] = { 1050 .op_func = (nfsd4op_func)nfsd4_secinfo, 1051 }, 1052 [OP_SETATTR] = { 1053 .op_func = (nfsd4op_func)nfsd4_setattr, 1054 }, 1055 [OP_SETCLIENTID] = { 1056 .op_func = (nfsd4op_func)nfsd4_setclientid, 1057 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1058 }, 1059 [OP_SETCLIENTID_CONFIRM] = { 1060 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm, 1061 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1062 }, 1063 [OP_VERIFY] = { 1064 .op_func = (nfsd4op_func)nfsd4_verify, 1065 }, 1066 [OP_WRITE] = { 1067 .op_func = (nfsd4op_func)nfsd4_write, 1068 }, 1069 [OP_RELEASE_LOCKOWNER] = { 1070 .op_func = (nfsd4op_func)nfsd4_release_lockowner, 1071 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS, 1072 }, 1073 }; 1074 1075 #define nfs4svc_decode_voidargs NULL 1076 #define nfs4svc_release_void NULL 1077 #define nfsd4_voidres nfsd4_voidargs 1078 #define nfs4svc_release_compound NULL 1079 struct nfsd4_voidargs { int dummy; }; 1080 1081 #define PROC(name, argt, rest, relt, cache, respsize) \ 1082 { (svc_procfunc) nfsd4_proc_##name, \ 1083 (kxdrproc_t) nfs4svc_decode_##argt##args, \ 1084 (kxdrproc_t) nfs4svc_encode_##rest##res, \ 1085 (kxdrproc_t) nfs4svc_release_##relt, \ 1086 sizeof(struct nfsd4_##argt##args), \ 1087 sizeof(struct nfsd4_##rest##res), \ 1088 0, \ 1089 cache, \ 1090 respsize, \ 1091 } 1092 1093 /* 1094 * TODO: At the present time, the NFSv4 server does not do XID caching 1095 * of requests. Implementing XID caching would not be a serious problem, 1096 * although it would require a mild change in interfaces since one 1097 * doesn't know whether an NFSv4 request is idempotent until after the 1098 * XDR decode. However, XID caching totally confuses pynfs (Peter 1099 * Astrand's regression testsuite for NFSv4 servers), which reuses 1100 * XID's liberally, so I've left it unimplemented until pynfs generates 1101 * better XID's. 1102 */ 1103 static struct svc_procedure nfsd_procedures4[2] = { 1104 PROC(null, void, void, void, RC_NOCACHE, 1), 1105 PROC(compound, compound, compound, compound, RC_NOCACHE, NFSD_BUFSIZE/4) 1106 }; 1107 1108 struct svc_version nfsd_version4 = { 1109 .vs_vers = 4, 1110 .vs_nproc = 2, 1111 .vs_proc = nfsd_procedures4, 1112 .vs_dispatch = nfsd_dispatch, 1113 .vs_xdrsize = NFS4_SVC_XDRSIZE, 1114 }; 1115 1116 /* 1117 * Local variables: 1118 * c-basic-offset: 8 1119 * End: 1120 */ 1121