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) 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 nfs4_unlock_state(); 244 return status; 245 } 246 247 /* 248 * filehandle-manipulating ops. 249 */ 250 static inline int 251 nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh) 252 { 253 if (!current_fh->fh_dentry) 254 return nfserr_nofilehandle; 255 256 *getfh = current_fh; 257 return nfs_ok; 258 } 259 260 static inline int 261 nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh) 262 { 263 fh_put(current_fh); 264 current_fh->fh_handle.fh_size = putfh->pf_fhlen; 265 memcpy(¤t_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen); 266 return fh_verify(rqstp, current_fh, 0, MAY_NOP); 267 } 268 269 static inline int 270 nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh) 271 { 272 int status; 273 274 fh_put(current_fh); 275 status = exp_pseudoroot(rqstp->rq_client, current_fh, 276 &rqstp->rq_chandle); 277 if (!status) 278 status = nfserrno(nfsd_setuser(rqstp, current_fh->fh_export)); 279 return status; 280 } 281 282 static inline int 283 nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh) 284 { 285 if (!save_fh->fh_dentry) 286 return nfserr_restorefh; 287 288 fh_dup2(current_fh, save_fh); 289 return nfs_ok; 290 } 291 292 static inline int 293 nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh) 294 { 295 if (!current_fh->fh_dentry) 296 return nfserr_nofilehandle; 297 298 fh_dup2(save_fh, current_fh); 299 return nfs_ok; 300 } 301 302 /* 303 * misc nfsv4 ops 304 */ 305 static inline int 306 nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access) 307 { 308 if (access->ac_req_access & ~NFS3_ACCESS_FULL) 309 return nfserr_inval; 310 311 access->ac_resp_access = access->ac_req_access; 312 return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported); 313 } 314 315 static inline int 316 nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit) 317 { 318 int status; 319 320 u32 *p = (u32 *)commit->co_verf.data; 321 *p++ = nfssvc_boot.tv_sec; 322 *p++ = nfssvc_boot.tv_usec; 323 324 status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count); 325 if (status == nfserr_symlink) 326 status = nfserr_inval; 327 return status; 328 } 329 330 static int 331 nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create) 332 { 333 struct svc_fh resfh; 334 int status; 335 dev_t rdev; 336 337 fh_init(&resfh, NFS4_FHSIZE); 338 339 status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE); 340 if (status == nfserr_symlink) 341 status = nfserr_notdir; 342 if (status) 343 return status; 344 345 switch (create->cr_type) { 346 case NF4LNK: 347 /* ugh! we have to null-terminate the linktext, or 348 * vfs_symlink() will choke. it is always safe to 349 * null-terminate by brute force, since at worst we 350 * will overwrite the first byte of the create namelen 351 * in the XDR buffer, which has already been extracted 352 * during XDR decode. 353 */ 354 create->cr_linkname[create->cr_linklen] = 0; 355 356 status = nfsd_symlink(rqstp, current_fh, create->cr_name, 357 create->cr_namelen, create->cr_linkname, 358 create->cr_linklen, &resfh, &create->cr_iattr); 359 break; 360 361 case NF4BLK: 362 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2); 363 if (MAJOR(rdev) != create->cr_specdata1 || 364 MINOR(rdev) != create->cr_specdata2) 365 return nfserr_inval; 366 status = nfsd_create(rqstp, current_fh, create->cr_name, 367 create->cr_namelen, &create->cr_iattr, 368 S_IFBLK, rdev, &resfh); 369 break; 370 371 case NF4CHR: 372 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2); 373 if (MAJOR(rdev) != create->cr_specdata1 || 374 MINOR(rdev) != create->cr_specdata2) 375 return nfserr_inval; 376 status = nfsd_create(rqstp, current_fh, create->cr_name, 377 create->cr_namelen, &create->cr_iattr, 378 S_IFCHR, rdev, &resfh); 379 break; 380 381 case NF4SOCK: 382 status = nfsd_create(rqstp, current_fh, create->cr_name, 383 create->cr_namelen, &create->cr_iattr, 384 S_IFSOCK, 0, &resfh); 385 break; 386 387 case NF4FIFO: 388 status = nfsd_create(rqstp, current_fh, create->cr_name, 389 create->cr_namelen, &create->cr_iattr, 390 S_IFIFO, 0, &resfh); 391 break; 392 393 case NF4DIR: 394 create->cr_iattr.ia_valid &= ~ATTR_SIZE; 395 status = nfsd_create(rqstp, current_fh, create->cr_name, 396 create->cr_namelen, &create->cr_iattr, 397 S_IFDIR, 0, &resfh); 398 break; 399 400 default: 401 status = nfserr_badtype; 402 } 403 404 if (!status) { 405 fh_unlock(current_fh); 406 set_change_info(&create->cr_cinfo, current_fh); 407 fh_dup2(current_fh, &resfh); 408 } 409 410 fh_put(&resfh); 411 return status; 412 } 413 414 static inline int 415 nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr) 416 { 417 int status; 418 419 status = fh_verify(rqstp, current_fh, 0, MAY_NOP); 420 if (status) 421 return status; 422 423 if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1) 424 return nfserr_inval; 425 426 getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0; 427 getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1; 428 429 getattr->ga_fhp = current_fh; 430 return nfs_ok; 431 } 432 433 static inline int 434 nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh, 435 struct svc_fh *save_fh, struct nfsd4_link *link) 436 { 437 int status = nfserr_nofilehandle; 438 439 if (!save_fh->fh_dentry) 440 return status; 441 status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh); 442 if (!status) 443 set_change_info(&link->li_cinfo, current_fh); 444 return status; 445 } 446 447 static int 448 nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh) 449 { 450 struct svc_fh tmp_fh; 451 int ret; 452 453 fh_init(&tmp_fh, NFS4_FHSIZE); 454 if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh, 455 &rqstp->rq_chandle)) != 0) 456 return ret; 457 if (tmp_fh.fh_dentry == current_fh->fh_dentry) { 458 fh_put(&tmp_fh); 459 return nfserr_noent; 460 } 461 fh_put(&tmp_fh); 462 return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh); 463 } 464 465 static inline int 466 nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup) 467 { 468 return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh); 469 } 470 471 static inline int 472 nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read) 473 { 474 int status; 475 476 /* no need to check permission - this will be done in nfsd_read() */ 477 478 read->rd_filp = NULL; 479 if (read->rd_offset >= OFFSET_MAX) 480 return nfserr_inval; 481 482 nfs4_lock_state(); 483 /* check stateid */ 484 if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid, 485 CHECK_FH | RD_STATE, &read->rd_filp))) { 486 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n"); 487 goto out; 488 } 489 if (read->rd_filp) 490 get_file(read->rd_filp); 491 status = nfs_ok; 492 out: 493 nfs4_unlock_state(); 494 read->rd_rqstp = rqstp; 495 read->rd_fhp = current_fh; 496 return status; 497 } 498 499 static inline int 500 nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir) 501 { 502 u64 cookie = readdir->rd_cookie; 503 static const nfs4_verifier zeroverf; 504 505 /* no need to check permission - this will be done in nfsd_readdir() */ 506 507 if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1) 508 return nfserr_inval; 509 510 readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0; 511 readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1; 512 513 if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) || 514 (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE))) 515 return nfserr_bad_cookie; 516 517 readdir->rd_rqstp = rqstp; 518 readdir->rd_fhp = current_fh; 519 return nfs_ok; 520 } 521 522 static inline int 523 nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink) 524 { 525 readlink->rl_rqstp = rqstp; 526 readlink->rl_fhp = current_fh; 527 return nfs_ok; 528 } 529 530 static inline int 531 nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove) 532 { 533 int status; 534 535 if (nfs4_in_grace()) 536 return nfserr_grace; 537 status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen); 538 if (status == nfserr_symlink) 539 return nfserr_notdir; 540 if (!status) { 541 fh_unlock(current_fh); 542 set_change_info(&remove->rm_cinfo, current_fh); 543 } 544 return status; 545 } 546 547 static inline int 548 nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh, 549 struct svc_fh *save_fh, struct nfsd4_rename *rename) 550 { 551 int status = nfserr_nofilehandle; 552 553 if (!save_fh->fh_dentry) 554 return status; 555 if (nfs4_in_grace() && !(save_fh->fh_export->ex_flags 556 & NFSEXP_NOSUBTREECHECK)) 557 return nfserr_grace; 558 status = nfsd_rename(rqstp, save_fh, rename->rn_sname, 559 rename->rn_snamelen, current_fh, 560 rename->rn_tname, rename->rn_tnamelen); 561 562 /* the underlying filesystem returns different error's than required 563 * by NFSv4. both save_fh and current_fh have been verified.. */ 564 if (status == nfserr_isdir) 565 status = nfserr_exist; 566 else if ((status == nfserr_notdir) && 567 (S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) && 568 S_ISDIR(current_fh->fh_dentry->d_inode->i_mode))) 569 status = nfserr_exist; 570 else if (status == nfserr_symlink) 571 status = nfserr_notdir; 572 573 if (!status) { 574 set_change_info(&rename->rn_sinfo, current_fh); 575 set_change_info(&rename->rn_tinfo, save_fh); 576 } 577 return status; 578 } 579 580 static inline int 581 nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr) 582 { 583 int status = nfs_ok; 584 585 if (!current_fh->fh_dentry) 586 return nfserr_nofilehandle; 587 588 status = nfs_ok; 589 if (setattr->sa_iattr.ia_valid & ATTR_SIZE) { 590 nfs4_lock_state(); 591 if ((status = nfs4_preprocess_stateid_op(current_fh, 592 &setattr->sa_stateid, 593 CHECK_FH | WR_STATE, NULL))) { 594 dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n"); 595 goto out_unlock; 596 } 597 nfs4_unlock_state(); 598 } 599 status = nfs_ok; 600 if (setattr->sa_acl != NULL) 601 status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl); 602 if (status) 603 goto out; 604 status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr, 605 0, (time_t)0); 606 out: 607 return status; 608 out_unlock: 609 nfs4_unlock_state(); 610 return status; 611 } 612 613 static inline int 614 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write) 615 { 616 stateid_t *stateid = &write->wr_stateid; 617 struct file *filp = NULL; 618 u32 *p; 619 int status = nfs_ok; 620 621 /* no need to check permission - this will be done in nfsd_write() */ 622 623 if (write->wr_offset >= OFFSET_MAX) 624 return nfserr_inval; 625 626 nfs4_lock_state(); 627 if ((status = nfs4_preprocess_stateid_op(current_fh, stateid, 628 CHECK_FH | WR_STATE, &filp))) { 629 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n"); 630 goto out; 631 } 632 if (filp) 633 get_file(filp); 634 nfs4_unlock_state(); 635 636 write->wr_bytes_written = write->wr_buflen; 637 write->wr_how_written = write->wr_stable_how; 638 p = (u32 *)write->wr_verifier.data; 639 *p++ = nfssvc_boot.tv_sec; 640 *p++ = nfssvc_boot.tv_usec; 641 642 status = nfsd_write(rqstp, current_fh, filp, write->wr_offset, 643 write->wr_vec, write->wr_vlen, write->wr_buflen, 644 &write->wr_how_written); 645 if (filp) 646 fput(filp); 647 648 if (status == nfserr_symlink) 649 status = nfserr_inval; 650 return status; 651 out: 652 nfs4_unlock_state(); 653 return status; 654 } 655 656 /* This routine never returns NFS_OK! If there are no other errors, it 657 * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the 658 * attributes matched. VERIFY is implemented by mapping NFSERR_SAME 659 * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK. 660 */ 661 static int 662 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify) 663 { 664 u32 *buf, *p; 665 int count; 666 int status; 667 668 status = fh_verify(rqstp, current_fh, 0, MAY_NOP); 669 if (status) 670 return status; 671 672 if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) 673 || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1)) 674 return nfserr_attrnotsupp; 675 if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR) 676 || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)) 677 return nfserr_inval; 678 if (verify->ve_attrlen & 3) 679 return nfserr_inval; 680 681 /* count in words: 682 * bitmap_len(1) + bitmap(2) + attr_len(1) = 4 683 */ 684 count = 4 + (verify->ve_attrlen >> 2); 685 buf = kmalloc(count << 2, GFP_KERNEL); 686 if (!buf) 687 return nfserr_resource; 688 689 status = nfsd4_encode_fattr(current_fh, current_fh->fh_export, 690 current_fh->fh_dentry, buf, 691 &count, verify->ve_bmval, 692 rqstp); 693 694 /* this means that nfsd4_encode_fattr() ran out of space */ 695 if (status == nfserr_resource && count == 0) 696 status = nfserr_not_same; 697 if (status) 698 goto out_kfree; 699 700 p = buf + 3; 701 status = nfserr_not_same; 702 if (ntohl(*p++) != verify->ve_attrlen) 703 goto out_kfree; 704 if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen)) 705 status = nfserr_same; 706 707 out_kfree: 708 kfree(buf); 709 return status; 710 } 711 712 /* 713 * NULL call. 714 */ 715 static int 716 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 717 { 718 return nfs_ok; 719 } 720 721 722 /* 723 * COMPOUND call. 724 */ 725 static int 726 nfsd4_proc_compound(struct svc_rqst *rqstp, 727 struct nfsd4_compoundargs *args, 728 struct nfsd4_compoundres *resp) 729 { 730 struct nfsd4_op *op; 731 struct svc_fh *current_fh = NULL; 732 struct svc_fh *save_fh = NULL; 733 struct nfs4_stateowner *replay_owner = NULL; 734 int slack_space; /* in words, not bytes! */ 735 int status; 736 737 status = nfserr_resource; 738 current_fh = kmalloc(sizeof(*current_fh), GFP_KERNEL); 739 if (current_fh == NULL) 740 goto out; 741 fh_init(current_fh, NFS4_FHSIZE); 742 save_fh = kmalloc(sizeof(*save_fh), GFP_KERNEL); 743 if (save_fh == NULL) 744 goto out; 745 fh_init(save_fh, NFS4_FHSIZE); 746 747 resp->xbuf = &rqstp->rq_res; 748 resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len; 749 resp->tagp = resp->p; 750 /* reserve space for: taglen, tag, and opcnt */ 751 resp->p += 2 + XDR_QUADLEN(args->taglen); 752 resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE; 753 resp->taglen = args->taglen; 754 resp->tag = args->tag; 755 resp->opcnt = 0; 756 resp->rqstp = rqstp; 757 758 /* 759 * According to RFC3010, this takes precedence over all other errors. 760 */ 761 status = nfserr_minor_vers_mismatch; 762 if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION) 763 goto out; 764 765 status = nfs_ok; 766 while (!status && resp->opcnt < args->opcnt) { 767 op = &args->ops[resp->opcnt++]; 768 769 /* 770 * The XDR decode routines may have pre-set op->status; 771 * for example, if there is a miscellaneous XDR error 772 * it will be set to nfserr_bad_xdr. 773 */ 774 if (op->status) 775 goto encode_op; 776 777 /* We must be able to encode a successful response to 778 * this operation, with enough room left over to encode a 779 * failed response to the next operation. If we don't 780 * have enough room, fail with ERR_RESOURCE. 781 */ 782 /* FIXME - is slack_space *really* words, or bytes??? - neilb */ 783 slack_space = (char *)resp->end - (char *)resp->p; 784 if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) { 785 BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE); 786 op->status = nfserr_resource; 787 goto encode_op; 788 } 789 790 /* All operations except RENEW, SETCLIENTID, RESTOREFH 791 * SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH 792 * require a valid current filehandle 793 * 794 * SETATTR NOFILEHANDLE error handled in nfsd4_setattr 795 * due to required returned bitmap argument 796 */ 797 if ((!current_fh->fh_dentry) && 798 !((op->opnum == OP_PUTFH) || (op->opnum == OP_PUTROOTFH) || 799 (op->opnum == OP_SETCLIENTID) || 800 (op->opnum == OP_SETCLIENTID_CONFIRM) || 801 (op->opnum == OP_RENEW) || (op->opnum == OP_RESTOREFH) || 802 (op->opnum == OP_RELEASE_LOCKOWNER) || 803 (op->opnum == OP_SETATTR))) { 804 op->status = nfserr_nofilehandle; 805 goto encode_op; 806 } 807 switch (op->opnum) { 808 case OP_ACCESS: 809 op->status = nfsd4_access(rqstp, current_fh, &op->u.access); 810 break; 811 case OP_CLOSE: 812 op->status = nfsd4_close(rqstp, current_fh, &op->u.close); 813 replay_owner = op->u.close.cl_stateowner; 814 break; 815 case OP_COMMIT: 816 op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit); 817 break; 818 case OP_CREATE: 819 op->status = nfsd4_create(rqstp, current_fh, &op->u.create); 820 break; 821 case OP_DELEGRETURN: 822 op->status = nfsd4_delegreturn(rqstp, current_fh, &op->u.delegreturn); 823 break; 824 case OP_GETATTR: 825 op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr); 826 break; 827 case OP_GETFH: 828 op->status = nfsd4_getfh(current_fh, &op->u.getfh); 829 break; 830 case OP_LINK: 831 op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link); 832 break; 833 case OP_LOCK: 834 op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock); 835 replay_owner = op->u.lock.lk_stateowner; 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); 842 replay_owner = op->u.locku.lu_stateowner; 843 break; 844 case OP_LOOKUP: 845 op->status = nfsd4_lookup(rqstp, current_fh, &op->u.lookup); 846 break; 847 case OP_LOOKUPP: 848 op->status = nfsd4_lookupp(rqstp, current_fh); 849 break; 850 case OP_NVERIFY: 851 op->status = nfsd4_verify(rqstp, current_fh, &op->u.nverify); 852 if (op->status == nfserr_not_same) 853 op->status = nfs_ok; 854 break; 855 case OP_OPEN: 856 op->status = nfsd4_open(rqstp, current_fh, &op->u.open); 857 replay_owner = op->u.open.op_stateowner; 858 break; 859 case OP_OPEN_CONFIRM: 860 op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm); 861 replay_owner = op->u.open_confirm.oc_stateowner; 862 break; 863 case OP_OPEN_DOWNGRADE: 864 op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade); 865 replay_owner = op->u.open_downgrade.od_stateowner; 866 break; 867 case OP_PUTFH: 868 op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh); 869 break; 870 case OP_PUTROOTFH: 871 op->status = nfsd4_putrootfh(rqstp, current_fh); 872 break; 873 case OP_READ: 874 op->status = nfsd4_read(rqstp, current_fh, &op->u.read); 875 break; 876 case OP_READDIR: 877 op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir); 878 break; 879 case OP_READLINK: 880 op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink); 881 break; 882 case OP_REMOVE: 883 op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove); 884 break; 885 case OP_RENAME: 886 op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename); 887 break; 888 case OP_RENEW: 889 op->status = nfsd4_renew(&op->u.renew); 890 break; 891 case OP_RESTOREFH: 892 op->status = nfsd4_restorefh(current_fh, save_fh); 893 break; 894 case OP_SAVEFH: 895 op->status = nfsd4_savefh(current_fh, save_fh); 896 break; 897 case OP_SETATTR: 898 op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr); 899 break; 900 case OP_SETCLIENTID: 901 op->status = nfsd4_setclientid(rqstp, &op->u.setclientid); 902 break; 903 case OP_SETCLIENTID_CONFIRM: 904 op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm); 905 break; 906 case OP_VERIFY: 907 op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify); 908 if (op->status == nfserr_same) 909 op->status = nfs_ok; 910 break; 911 case OP_WRITE: 912 op->status = nfsd4_write(rqstp, current_fh, &op->u.write); 913 break; 914 case OP_RELEASE_LOCKOWNER: 915 op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner); 916 break; 917 default: 918 BUG_ON(op->status == nfs_ok); 919 break; 920 } 921 922 encode_op: 923 if (op->status == NFSERR_REPLAY_ME) { 924 op->replay = &replay_owner->so_replay; 925 nfsd4_encode_replay(resp, op); 926 status = op->status = op->replay->rp_status; 927 } else { 928 nfsd4_encode_operation(resp, op); 929 status = op->status; 930 } 931 if (replay_owner && (replay_owner != (void *)(-1))) { 932 nfs4_put_stateowner(replay_owner); 933 replay_owner = NULL; 934 } 935 /* XXX Ugh, we need to get rid of this kind of special case: */ 936 if (op->opnum == OP_READ && op->u.read.rd_filp) 937 fput(op->u.read.rd_filp); 938 } 939 940 out: 941 nfsd4_release_compoundargs(args); 942 if (current_fh) 943 fh_put(current_fh); 944 kfree(current_fh); 945 if (save_fh) 946 fh_put(save_fh); 947 kfree(save_fh); 948 return status; 949 } 950 951 #define nfs4svc_decode_voidargs NULL 952 #define nfs4svc_release_void NULL 953 #define nfsd4_voidres nfsd4_voidargs 954 #define nfs4svc_release_compound NULL 955 struct nfsd4_voidargs { int dummy; }; 956 957 #define PROC(name, argt, rest, relt, cache, respsize) \ 958 { (svc_procfunc) nfsd4_proc_##name, \ 959 (kxdrproc_t) nfs4svc_decode_##argt##args, \ 960 (kxdrproc_t) nfs4svc_encode_##rest##res, \ 961 (kxdrproc_t) nfs4svc_release_##relt, \ 962 sizeof(struct nfsd4_##argt##args), \ 963 sizeof(struct nfsd4_##rest##res), \ 964 0, \ 965 cache, \ 966 respsize, \ 967 } 968 969 /* 970 * TODO: At the present time, the NFSv4 server does not do XID caching 971 * of requests. Implementing XID caching would not be a serious problem, 972 * although it would require a mild change in interfaces since one 973 * doesn't know whether an NFSv4 request is idempotent until after the 974 * XDR decode. However, XID caching totally confuses pynfs (Peter 975 * Astrand's regression testsuite for NFSv4 servers), which reuses 976 * XID's liberally, so I've left it unimplemented until pynfs generates 977 * better XID's. 978 */ 979 static struct svc_procedure nfsd_procedures4[2] = { 980 PROC(null, void, void, void, RC_NOCACHE, 1), 981 PROC(compound, compound, compound, compound, RC_NOCACHE, NFSD_BUFSIZE) 982 }; 983 984 struct svc_version nfsd_version4 = { 985 .vs_vers = 4, 986 .vs_nproc = 2, 987 .vs_proc = nfsd_procedures4, 988 .vs_dispatch = nfsd_dispatch, 989 .vs_xdrsize = NFS4_SVC_XDRSIZE, 990 }; 991 992 /* 993 * Local variables: 994 * c-basic-offset: 8 995 * End: 996 */ 997