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