1 /* 2 * fs/nfs/nfs4xdr.c 3 * 4 * Server-side XDR 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 * TODO: Neil Brown made the following observation: We currently 38 * initially reserve NFSD_BUFSIZE space on the transmit queue and 39 * never release any of that until the request is complete. 40 * It would be good to calculate a new maximum response size while 41 * decoding the COMPOUND, and call svc_reserve with this number 42 * at the end of nfs4svc_decode_compoundargs. 43 */ 44 45 #include <linux/param.h> 46 #include <linux/smp.h> 47 #include <linux/smp_lock.h> 48 #include <linux/fs.h> 49 #include <linux/namei.h> 50 #include <linux/vfs.h> 51 #include <linux/sunrpc/xdr.h> 52 #include <linux/sunrpc/svc.h> 53 #include <linux/sunrpc/clnt.h> 54 #include <linux/nfsd/nfsd.h> 55 #include <linux/nfsd/state.h> 56 #include <linux/nfsd/xdr4.h> 57 #include <linux/nfsd_idmap.h> 58 #include <linux/nfs4.h> 59 #include <linux/nfs4_acl.h> 60 61 #define NFSDDBG_FACILITY NFSDDBG_XDR 62 63 static int 64 check_filename(char *str, int len, int err) 65 { 66 int i; 67 68 if (len == 0) 69 return nfserr_inval; 70 if (isdotent(str, len)) 71 return err; 72 for (i = 0; i < len; i++) 73 if (str[i] == '/') 74 return err; 75 return 0; 76 } 77 78 /* 79 * START OF "GENERIC" DECODE ROUTINES. 80 * These may look a little ugly since they are imported from a "generic" 81 * set of XDR encode/decode routines which are intended to be shared by 82 * all of our NFSv4 implementations (OpenBSD, MacOS X...). 83 * 84 * If the pain of reading these is too great, it should be a straightforward 85 * task to translate them into Linux-specific versions which are more 86 * consistent with the style used in NFSv2/v3... 87 */ 88 #define DECODE_HEAD \ 89 u32 *p; \ 90 int status 91 #define DECODE_TAIL \ 92 status = 0; \ 93 out: \ 94 return status; \ 95 xdr_error: \ 96 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \ 97 status = nfserr_bad_xdr; \ 98 goto out 99 100 #define READ32(x) (x) = ntohl(*p++) 101 #define READ64(x) do { \ 102 (x) = (u64)ntohl(*p++) << 32; \ 103 (x) |= ntohl(*p++); \ 104 } while (0) 105 #define READTIME(x) do { \ 106 p++; \ 107 (x) = ntohl(*p++); \ 108 p++; \ 109 } while (0) 110 #define READMEM(x,nbytes) do { \ 111 x = (char *)p; \ 112 p += XDR_QUADLEN(nbytes); \ 113 } while (0) 114 #define SAVEMEM(x,nbytes) do { \ 115 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \ 116 savemem(argp, p, nbytes) : \ 117 (char *)p)) { \ 118 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \ 119 goto xdr_error; \ 120 } \ 121 p += XDR_QUADLEN(nbytes); \ 122 } while (0) 123 #define COPYMEM(x,nbytes) do { \ 124 memcpy((x), p, nbytes); \ 125 p += XDR_QUADLEN(nbytes); \ 126 } while (0) 127 128 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */ 129 #define READ_BUF(nbytes) do { \ 130 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \ 131 p = argp->p; \ 132 argp->p += XDR_QUADLEN(nbytes); \ 133 } else if (!(p = read_buf(argp, nbytes))) { \ 134 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \ 135 goto xdr_error; \ 136 } \ 137 } while (0) 138 139 static u32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes) 140 { 141 /* We want more bytes than seem to be available. 142 * Maybe we need a new page, maybe we have just run out 143 */ 144 int avail = (char*)argp->end - (char*)argp->p; 145 u32 *p; 146 if (avail + argp->pagelen < nbytes) 147 return NULL; 148 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */ 149 return NULL; 150 /* ok, we can do it with the current plus the next page */ 151 if (nbytes <= sizeof(argp->tmp)) 152 p = argp->tmp; 153 else { 154 kfree(argp->tmpp); 155 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL); 156 if (!p) 157 return NULL; 158 159 } 160 memcpy(p, argp->p, avail); 161 /* step to next page */ 162 argp->p = page_address(argp->pagelist[0]); 163 argp->pagelist++; 164 if (argp->pagelen < PAGE_SIZE) { 165 argp->end = p + (argp->pagelen>>2); 166 argp->pagelen = 0; 167 } else { 168 argp->end = p + (PAGE_SIZE>>2); 169 argp->pagelen -= PAGE_SIZE; 170 } 171 memcpy(((char*)p)+avail, argp->p, (nbytes - avail)); 172 argp->p += XDR_QUADLEN(nbytes - avail); 173 return p; 174 } 175 176 static int 177 defer_free(struct nfsd4_compoundargs *argp, 178 void (*release)(const void *), void *p) 179 { 180 struct tmpbuf *tb; 181 182 tb = kmalloc(sizeof(*tb), GFP_KERNEL); 183 if (!tb) 184 return -ENOMEM; 185 tb->buf = p; 186 tb->release = release; 187 tb->next = argp->to_free; 188 argp->to_free = tb; 189 return 0; 190 } 191 192 static char *savemem(struct nfsd4_compoundargs *argp, u32 *p, int nbytes) 193 { 194 void *new = NULL; 195 if (p == argp->tmp) { 196 new = kmalloc(nbytes, GFP_KERNEL); 197 if (!new) return NULL; 198 p = new; 199 memcpy(p, argp->tmp, nbytes); 200 } else { 201 if (p != argp->tmpp) 202 BUG(); 203 argp->tmpp = NULL; 204 } 205 if (defer_free(argp, kfree, p)) { 206 kfree(new); 207 return NULL; 208 } else 209 return (char *)p; 210 } 211 212 213 static int 214 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval) 215 { 216 u32 bmlen; 217 DECODE_HEAD; 218 219 bmval[0] = 0; 220 bmval[1] = 0; 221 222 READ_BUF(4); 223 READ32(bmlen); 224 if (bmlen > 1000) 225 goto xdr_error; 226 227 READ_BUF(bmlen << 2); 228 if (bmlen > 0) 229 READ32(bmval[0]); 230 if (bmlen > 1) 231 READ32(bmval[1]); 232 233 DECODE_TAIL; 234 } 235 236 static int 237 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr, 238 struct nfs4_acl **acl) 239 { 240 int expected_len, len = 0; 241 u32 dummy32; 242 char *buf; 243 244 DECODE_HEAD; 245 iattr->ia_valid = 0; 246 if ((status = nfsd4_decode_bitmap(argp, bmval))) 247 return status; 248 249 /* 250 * According to spec, unsupported attributes return ERR_NOTSUPP; 251 * read-only attributes return ERR_INVAL. 252 */ 253 if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1)) 254 return nfserr_attrnotsupp; 255 if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1)) 256 return nfserr_inval; 257 258 READ_BUF(4); 259 READ32(expected_len); 260 261 if (bmval[0] & FATTR4_WORD0_SIZE) { 262 READ_BUF(8); 263 len += 8; 264 READ64(iattr->ia_size); 265 iattr->ia_valid |= ATTR_SIZE; 266 } 267 if (bmval[0] & FATTR4_WORD0_ACL) { 268 int nace, i; 269 struct nfs4_ace ace; 270 271 READ_BUF(4); len += 4; 272 READ32(nace); 273 274 *acl = nfs4_acl_new(); 275 if (*acl == NULL) { 276 status = -ENOMEM; 277 goto out_nfserr; 278 } 279 defer_free(argp, (void (*)(const void *))nfs4_acl_free, *acl); 280 281 for (i = 0; i < nace; i++) { 282 READ_BUF(16); len += 16; 283 READ32(ace.type); 284 READ32(ace.flag); 285 READ32(ace.access_mask); 286 READ32(dummy32); 287 READ_BUF(dummy32); 288 len += XDR_QUADLEN(dummy32) << 2; 289 READMEM(buf, dummy32); 290 ace.whotype = nfs4_acl_get_whotype(buf, dummy32); 291 status = 0; 292 if (ace.whotype != NFS4_ACL_WHO_NAMED) 293 ace.who = 0; 294 else if (ace.flag & NFS4_ACE_IDENTIFIER_GROUP) 295 status = nfsd_map_name_to_gid(argp->rqstp, 296 buf, dummy32, &ace.who); 297 else 298 status = nfsd_map_name_to_uid(argp->rqstp, 299 buf, dummy32, &ace.who); 300 if (status) 301 goto out_nfserr; 302 if (nfs4_acl_add_ace(*acl, ace.type, ace.flag, 303 ace.access_mask, ace.whotype, ace.who) != 0) { 304 status = -ENOMEM; 305 goto out_nfserr; 306 } 307 } 308 } else 309 *acl = NULL; 310 if (bmval[1] & FATTR4_WORD1_MODE) { 311 READ_BUF(4); 312 len += 4; 313 READ32(iattr->ia_mode); 314 iattr->ia_mode &= (S_IFMT | S_IALLUGO); 315 iattr->ia_valid |= ATTR_MODE; 316 } 317 if (bmval[1] & FATTR4_WORD1_OWNER) { 318 READ_BUF(4); 319 len += 4; 320 READ32(dummy32); 321 READ_BUF(dummy32); 322 len += (XDR_QUADLEN(dummy32) << 2); 323 READMEM(buf, dummy32); 324 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid))) 325 goto out_nfserr; 326 iattr->ia_valid |= ATTR_UID; 327 } 328 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) { 329 READ_BUF(4); 330 len += 4; 331 READ32(dummy32); 332 READ_BUF(dummy32); 333 len += (XDR_QUADLEN(dummy32) << 2); 334 READMEM(buf, dummy32); 335 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid))) 336 goto out_nfserr; 337 iattr->ia_valid |= ATTR_GID; 338 } 339 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) { 340 READ_BUF(4); 341 len += 4; 342 READ32(dummy32); 343 switch (dummy32) { 344 case NFS4_SET_TO_CLIENT_TIME: 345 /* We require the high 32 bits of 'seconds' to be 0, and we ignore 346 all 32 bits of 'nseconds'. */ 347 READ_BUF(12); 348 len += 12; 349 READ32(dummy32); 350 if (dummy32) 351 return nfserr_inval; 352 READ32(iattr->ia_atime.tv_sec); 353 READ32(iattr->ia_atime.tv_nsec); 354 if (iattr->ia_atime.tv_nsec >= (u32)1000000000) 355 return nfserr_inval; 356 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET); 357 break; 358 case NFS4_SET_TO_SERVER_TIME: 359 iattr->ia_valid |= ATTR_ATIME; 360 break; 361 default: 362 goto xdr_error; 363 } 364 } 365 if (bmval[1] & FATTR4_WORD1_TIME_METADATA) { 366 /* We require the high 32 bits of 'seconds' to be 0, and we ignore 367 all 32 bits of 'nseconds'. */ 368 READ_BUF(12); 369 len += 12; 370 READ32(dummy32); 371 if (dummy32) 372 return nfserr_inval; 373 READ32(iattr->ia_ctime.tv_sec); 374 READ32(iattr->ia_ctime.tv_nsec); 375 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000) 376 return nfserr_inval; 377 iattr->ia_valid |= ATTR_CTIME; 378 } 379 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) { 380 READ_BUF(4); 381 len += 4; 382 READ32(dummy32); 383 switch (dummy32) { 384 case NFS4_SET_TO_CLIENT_TIME: 385 /* We require the high 32 bits of 'seconds' to be 0, and we ignore 386 all 32 bits of 'nseconds'. */ 387 READ_BUF(12); 388 len += 12; 389 READ32(dummy32); 390 if (dummy32) 391 return nfserr_inval; 392 READ32(iattr->ia_mtime.tv_sec); 393 READ32(iattr->ia_mtime.tv_nsec); 394 if (iattr->ia_mtime.tv_nsec >= (u32)1000000000) 395 return nfserr_inval; 396 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET); 397 break; 398 case NFS4_SET_TO_SERVER_TIME: 399 iattr->ia_valid |= ATTR_MTIME; 400 break; 401 default: 402 goto xdr_error; 403 } 404 } 405 if (len != expected_len) 406 goto xdr_error; 407 408 DECODE_TAIL; 409 410 out_nfserr: 411 status = nfserrno(status); 412 goto out; 413 } 414 415 static int 416 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access) 417 { 418 DECODE_HEAD; 419 420 READ_BUF(4); 421 READ32(access->ac_req_access); 422 423 DECODE_TAIL; 424 } 425 426 static int 427 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close) 428 { 429 DECODE_HEAD; 430 431 close->cl_stateowner = NULL; 432 READ_BUF(4 + sizeof(stateid_t)); 433 READ32(close->cl_seqid); 434 READ32(close->cl_stateid.si_generation); 435 COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t)); 436 437 DECODE_TAIL; 438 } 439 440 441 static int 442 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit) 443 { 444 DECODE_HEAD; 445 446 READ_BUF(12); 447 READ64(commit->co_offset); 448 READ32(commit->co_count); 449 450 DECODE_TAIL; 451 } 452 453 static int 454 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create) 455 { 456 DECODE_HEAD; 457 458 READ_BUF(4); 459 READ32(create->cr_type); 460 switch (create->cr_type) { 461 case NF4LNK: 462 READ_BUF(4); 463 READ32(create->cr_linklen); 464 READ_BUF(create->cr_linklen); 465 SAVEMEM(create->cr_linkname, create->cr_linklen); 466 break; 467 case NF4BLK: 468 case NF4CHR: 469 READ_BUF(8); 470 READ32(create->cr_specdata1); 471 READ32(create->cr_specdata2); 472 break; 473 case NF4SOCK: 474 case NF4FIFO: 475 case NF4DIR: 476 default: 477 break; 478 } 479 480 READ_BUF(4); 481 READ32(create->cr_namelen); 482 READ_BUF(create->cr_namelen); 483 SAVEMEM(create->cr_name, create->cr_namelen); 484 if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval))) 485 return status; 486 487 if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl))) 488 goto out; 489 490 DECODE_TAIL; 491 } 492 493 static inline int 494 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr) 495 { 496 DECODE_HEAD; 497 498 READ_BUF(sizeof(stateid_t)); 499 READ32(dr->dr_stateid.si_generation); 500 COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t)); 501 502 DECODE_TAIL; 503 } 504 505 static inline int 506 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr) 507 { 508 return nfsd4_decode_bitmap(argp, getattr->ga_bmval); 509 } 510 511 static int 512 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link) 513 { 514 DECODE_HEAD; 515 516 READ_BUF(4); 517 READ32(link->li_namelen); 518 READ_BUF(link->li_namelen); 519 SAVEMEM(link->li_name, link->li_namelen); 520 if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval))) 521 return status; 522 523 DECODE_TAIL; 524 } 525 526 static int 527 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock) 528 { 529 DECODE_HEAD; 530 531 lock->lk_stateowner = NULL; 532 /* 533 * type, reclaim(boolean), offset, length, new_lock_owner(boolean) 534 */ 535 READ_BUF(28); 536 READ32(lock->lk_type); 537 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT)) 538 goto xdr_error; 539 READ32(lock->lk_reclaim); 540 READ64(lock->lk_offset); 541 READ64(lock->lk_length); 542 READ32(lock->lk_is_new); 543 544 if (lock->lk_is_new) { 545 READ_BUF(36); 546 READ32(lock->lk_new_open_seqid); 547 READ32(lock->lk_new_open_stateid.si_generation); 548 549 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t)); 550 READ32(lock->lk_new_lock_seqid); 551 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t)); 552 READ32(lock->lk_new_owner.len); 553 READ_BUF(lock->lk_new_owner.len); 554 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len); 555 } else { 556 READ_BUF(20); 557 READ32(lock->lk_old_lock_stateid.si_generation); 558 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t)); 559 READ32(lock->lk_old_lock_seqid); 560 } 561 562 DECODE_TAIL; 563 } 564 565 static int 566 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt) 567 { 568 DECODE_HEAD; 569 570 READ_BUF(32); 571 READ32(lockt->lt_type); 572 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT)) 573 goto xdr_error; 574 READ64(lockt->lt_offset); 575 READ64(lockt->lt_length); 576 COPYMEM(&lockt->lt_clientid, 8); 577 READ32(lockt->lt_owner.len); 578 READ_BUF(lockt->lt_owner.len); 579 READMEM(lockt->lt_owner.data, lockt->lt_owner.len); 580 581 DECODE_TAIL; 582 } 583 584 static int 585 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku) 586 { 587 DECODE_HEAD; 588 589 locku->lu_stateowner = NULL; 590 READ_BUF(24 + sizeof(stateid_t)); 591 READ32(locku->lu_type); 592 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT)) 593 goto xdr_error; 594 READ32(locku->lu_seqid); 595 READ32(locku->lu_stateid.si_generation); 596 COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t)); 597 READ64(locku->lu_offset); 598 READ64(locku->lu_length); 599 600 DECODE_TAIL; 601 } 602 603 static int 604 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup) 605 { 606 DECODE_HEAD; 607 608 READ_BUF(4); 609 READ32(lookup->lo_len); 610 READ_BUF(lookup->lo_len); 611 SAVEMEM(lookup->lo_name, lookup->lo_len); 612 if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent))) 613 return status; 614 615 DECODE_TAIL; 616 } 617 618 static int 619 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 620 { 621 DECODE_HEAD; 622 623 memset(open->op_bmval, 0, sizeof(open->op_bmval)); 624 open->op_iattr.ia_valid = 0; 625 open->op_stateowner = NULL; 626 627 /* seqid, share_access, share_deny, clientid, ownerlen */ 628 READ_BUF(16 + sizeof(clientid_t)); 629 READ32(open->op_seqid); 630 READ32(open->op_share_access); 631 READ32(open->op_share_deny); 632 COPYMEM(&open->op_clientid, sizeof(clientid_t)); 633 READ32(open->op_owner.len); 634 635 /* owner, open_flag */ 636 READ_BUF(open->op_owner.len + 4); 637 SAVEMEM(open->op_owner.data, open->op_owner.len); 638 READ32(open->op_create); 639 switch (open->op_create) { 640 case NFS4_OPEN_NOCREATE: 641 break; 642 case NFS4_OPEN_CREATE: 643 READ_BUF(4); 644 READ32(open->op_createmode); 645 switch (open->op_createmode) { 646 case NFS4_CREATE_UNCHECKED: 647 case NFS4_CREATE_GUARDED: 648 if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl))) 649 goto out; 650 break; 651 case NFS4_CREATE_EXCLUSIVE: 652 READ_BUF(8); 653 COPYMEM(open->op_verf.data, 8); 654 break; 655 default: 656 goto xdr_error; 657 } 658 break; 659 default: 660 goto xdr_error; 661 } 662 663 /* open_claim */ 664 READ_BUF(4); 665 READ32(open->op_claim_type); 666 switch (open->op_claim_type) { 667 case NFS4_OPEN_CLAIM_NULL: 668 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 669 READ_BUF(4); 670 READ32(open->op_fname.len); 671 READ_BUF(open->op_fname.len); 672 SAVEMEM(open->op_fname.data, open->op_fname.len); 673 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval))) 674 return status; 675 break; 676 case NFS4_OPEN_CLAIM_PREVIOUS: 677 READ_BUF(4); 678 READ32(open->op_delegate_type); 679 break; 680 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 681 READ_BUF(sizeof(stateid_t) + 4); 682 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t)); 683 READ32(open->op_fname.len); 684 READ_BUF(open->op_fname.len); 685 SAVEMEM(open->op_fname.data, open->op_fname.len); 686 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval))) 687 return status; 688 break; 689 default: 690 goto xdr_error; 691 } 692 693 DECODE_TAIL; 694 } 695 696 static int 697 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf) 698 { 699 DECODE_HEAD; 700 701 open_conf->oc_stateowner = NULL; 702 READ_BUF(4 + sizeof(stateid_t)); 703 READ32(open_conf->oc_req_stateid.si_generation); 704 COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t)); 705 READ32(open_conf->oc_seqid); 706 707 DECODE_TAIL; 708 } 709 710 static int 711 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down) 712 { 713 DECODE_HEAD; 714 715 open_down->od_stateowner = NULL; 716 READ_BUF(12 + sizeof(stateid_t)); 717 READ32(open_down->od_stateid.si_generation); 718 COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t)); 719 READ32(open_down->od_seqid); 720 READ32(open_down->od_share_access); 721 READ32(open_down->od_share_deny); 722 723 DECODE_TAIL; 724 } 725 726 static int 727 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh) 728 { 729 DECODE_HEAD; 730 731 READ_BUF(4); 732 READ32(putfh->pf_fhlen); 733 if (putfh->pf_fhlen > NFS4_FHSIZE) 734 goto xdr_error; 735 READ_BUF(putfh->pf_fhlen); 736 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen); 737 738 DECODE_TAIL; 739 } 740 741 static int 742 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read) 743 { 744 DECODE_HEAD; 745 746 READ_BUF(sizeof(stateid_t) + 12); 747 READ32(read->rd_stateid.si_generation); 748 COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t)); 749 READ64(read->rd_offset); 750 READ32(read->rd_length); 751 752 DECODE_TAIL; 753 } 754 755 static int 756 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir) 757 { 758 DECODE_HEAD; 759 760 READ_BUF(24); 761 READ64(readdir->rd_cookie); 762 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data)); 763 READ32(readdir->rd_dircount); /* just in case you needed a useless field... */ 764 READ32(readdir->rd_maxcount); 765 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval))) 766 goto out; 767 768 DECODE_TAIL; 769 } 770 771 static int 772 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove) 773 { 774 DECODE_HEAD; 775 776 READ_BUF(4); 777 READ32(remove->rm_namelen); 778 READ_BUF(remove->rm_namelen); 779 SAVEMEM(remove->rm_name, remove->rm_namelen); 780 if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent))) 781 return status; 782 783 DECODE_TAIL; 784 } 785 786 static int 787 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename) 788 { 789 DECODE_HEAD; 790 791 READ_BUF(4); 792 READ32(rename->rn_snamelen); 793 READ_BUF(rename->rn_snamelen + 4); 794 SAVEMEM(rename->rn_sname, rename->rn_snamelen); 795 READ32(rename->rn_tnamelen); 796 READ_BUF(rename->rn_tnamelen); 797 SAVEMEM(rename->rn_tname, rename->rn_tnamelen); 798 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent))) 799 return status; 800 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval))) 801 return status; 802 803 DECODE_TAIL; 804 } 805 806 static int 807 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid) 808 { 809 DECODE_HEAD; 810 811 READ_BUF(sizeof(clientid_t)); 812 COPYMEM(clientid, sizeof(clientid_t)); 813 814 DECODE_TAIL; 815 } 816 817 static int 818 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr) 819 { 820 DECODE_HEAD; 821 822 READ_BUF(sizeof(stateid_t)); 823 READ32(setattr->sa_stateid.si_generation); 824 COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t)); 825 if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl))) 826 goto out; 827 828 DECODE_TAIL; 829 } 830 831 static int 832 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid) 833 { 834 DECODE_HEAD; 835 836 READ_BUF(12); 837 COPYMEM(setclientid->se_verf.data, 8); 838 READ32(setclientid->se_namelen); 839 840 READ_BUF(setclientid->se_namelen + 8); 841 SAVEMEM(setclientid->se_name, setclientid->se_namelen); 842 READ32(setclientid->se_callback_prog); 843 READ32(setclientid->se_callback_netid_len); 844 845 READ_BUF(setclientid->se_callback_netid_len + 4); 846 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len); 847 READ32(setclientid->se_callback_addr_len); 848 849 READ_BUF(setclientid->se_callback_addr_len + 4); 850 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len); 851 READ32(setclientid->se_callback_ident); 852 853 DECODE_TAIL; 854 } 855 856 static int 857 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c) 858 { 859 DECODE_HEAD; 860 861 READ_BUF(8 + sizeof(nfs4_verifier)); 862 COPYMEM(&scd_c->sc_clientid, 8); 863 COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier)); 864 865 DECODE_TAIL; 866 } 867 868 /* Also used for NVERIFY */ 869 static int 870 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify) 871 { 872 #if 0 873 struct nfsd4_compoundargs save = { 874 .p = argp->p, 875 .end = argp->end, 876 .rqstp = argp->rqstp, 877 }; 878 u32 ve_bmval[2]; 879 struct iattr ve_iattr; /* request */ 880 struct nfs4_acl *ve_acl; /* request */ 881 #endif 882 DECODE_HEAD; 883 884 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval))) 885 goto out; 886 887 /* For convenience's sake, we compare raw xdr'd attributes in 888 * nfsd4_proc_verify; however we still decode here just to return 889 * correct error in case of bad xdr. */ 890 #if 0 891 status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl); 892 if (status == nfserr_inval) { 893 status = nfserrno(status); 894 goto out; 895 } 896 #endif 897 READ_BUF(4); 898 READ32(verify->ve_attrlen); 899 READ_BUF(verify->ve_attrlen); 900 SAVEMEM(verify->ve_attrval, verify->ve_attrlen); 901 902 DECODE_TAIL; 903 } 904 905 static int 906 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write) 907 { 908 int avail; 909 int v; 910 int len; 911 DECODE_HEAD; 912 913 READ_BUF(sizeof(stateid_opaque_t) + 20); 914 READ32(write->wr_stateid.si_generation); 915 COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t)); 916 READ64(write->wr_offset); 917 READ32(write->wr_stable_how); 918 if (write->wr_stable_how > 2) 919 goto xdr_error; 920 READ32(write->wr_buflen); 921 922 /* Sorry .. no magic macros for this.. * 923 * READ_BUF(write->wr_buflen); 924 * SAVEMEM(write->wr_buf, write->wr_buflen); 925 */ 926 avail = (char*)argp->end - (char*)argp->p; 927 if (avail + argp->pagelen < write->wr_buflen) { 928 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); 929 goto xdr_error; 930 } 931 write->wr_vec[0].iov_base = p; 932 write->wr_vec[0].iov_len = avail; 933 v = 0; 934 len = write->wr_buflen; 935 while (len > write->wr_vec[v].iov_len) { 936 len -= write->wr_vec[v].iov_len; 937 v++; 938 write->wr_vec[v].iov_base = page_address(argp->pagelist[0]); 939 argp->pagelist++; 940 if (argp->pagelen >= PAGE_SIZE) { 941 write->wr_vec[v].iov_len = PAGE_SIZE; 942 argp->pagelen -= PAGE_SIZE; 943 } else { 944 write->wr_vec[v].iov_len = argp->pagelen; 945 argp->pagelen -= len; 946 } 947 } 948 argp->end = (u32*) (write->wr_vec[v].iov_base + write->wr_vec[v].iov_len); 949 argp->p = (u32*) (write->wr_vec[v].iov_base + (XDR_QUADLEN(len) << 2)); 950 write->wr_vec[v].iov_len = len; 951 write->wr_vlen = v+1; 952 953 DECODE_TAIL; 954 } 955 956 static int 957 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner) 958 { 959 DECODE_HEAD; 960 961 READ_BUF(12); 962 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t)); 963 READ32(rlockowner->rl_owner.len); 964 READ_BUF(rlockowner->rl_owner.len); 965 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len); 966 967 DECODE_TAIL; 968 } 969 970 static int 971 nfsd4_decode_compound(struct nfsd4_compoundargs *argp) 972 { 973 DECODE_HEAD; 974 struct nfsd4_op *op; 975 int i; 976 977 /* 978 * XXX: According to spec, we should check the tag 979 * for UTF-8 compliance. I'm postponing this for 980 * now because it seems that some clients do use 981 * binary tags. 982 */ 983 READ_BUF(4); 984 READ32(argp->taglen); 985 READ_BUF(argp->taglen + 8); 986 SAVEMEM(argp->tag, argp->taglen); 987 READ32(argp->minorversion); 988 READ32(argp->opcnt); 989 990 if (argp->taglen > NFSD4_MAX_TAGLEN) 991 goto xdr_error; 992 if (argp->opcnt > 100) 993 goto xdr_error; 994 995 if (argp->opcnt > sizeof(argp->iops)/sizeof(argp->iops[0])) { 996 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL); 997 if (!argp->ops) { 998 argp->ops = argp->iops; 999 printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n"); 1000 goto xdr_error; 1001 } 1002 } 1003 1004 for (i = 0; i < argp->opcnt; i++) { 1005 op = &argp->ops[i]; 1006 op->replay = NULL; 1007 1008 /* 1009 * We can't use READ_BUF() here because we need to handle 1010 * a missing opcode as an OP_WRITE + 1. So we need to check 1011 * to see if we're truly at the end of our buffer or if there 1012 * is another page we need to flip to. 1013 */ 1014 1015 if (argp->p == argp->end) { 1016 if (argp->pagelen < 4) { 1017 /* There isn't an opcode still on the wire */ 1018 op->opnum = OP_WRITE + 1; 1019 op->status = nfserr_bad_xdr; 1020 argp->opcnt = i+1; 1021 break; 1022 } 1023 1024 /* 1025 * False alarm. We just hit a page boundary, but there 1026 * is still data available. Move pointer across page 1027 * boundary. *snip from READ_BUF* 1028 */ 1029 argp->p = page_address(argp->pagelist[0]); 1030 argp->pagelist++; 1031 if (argp->pagelen < PAGE_SIZE) { 1032 argp->end = p + (argp->pagelen>>2); 1033 argp->pagelen = 0; 1034 } else { 1035 argp->end = p + (PAGE_SIZE>>2); 1036 argp->pagelen -= PAGE_SIZE; 1037 } 1038 } 1039 op->opnum = ntohl(*argp->p++); 1040 1041 switch (op->opnum) { 1042 case 2: /* Reserved operation */ 1043 op->opnum = OP_ILLEGAL; 1044 if (argp->minorversion == 0) 1045 op->status = nfserr_op_illegal; 1046 else 1047 op->status = nfserr_minor_vers_mismatch; 1048 break; 1049 case OP_ACCESS: 1050 op->status = nfsd4_decode_access(argp, &op->u.access); 1051 break; 1052 case OP_CLOSE: 1053 op->status = nfsd4_decode_close(argp, &op->u.close); 1054 break; 1055 case OP_COMMIT: 1056 op->status = nfsd4_decode_commit(argp, &op->u.commit); 1057 break; 1058 case OP_CREATE: 1059 op->status = nfsd4_decode_create(argp, &op->u.create); 1060 break; 1061 case OP_DELEGRETURN: 1062 op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn); 1063 break; 1064 case OP_GETATTR: 1065 op->status = nfsd4_decode_getattr(argp, &op->u.getattr); 1066 break; 1067 case OP_GETFH: 1068 op->status = nfs_ok; 1069 break; 1070 case OP_LINK: 1071 op->status = nfsd4_decode_link(argp, &op->u.link); 1072 break; 1073 case OP_LOCK: 1074 op->status = nfsd4_decode_lock(argp, &op->u.lock); 1075 break; 1076 case OP_LOCKT: 1077 op->status = nfsd4_decode_lockt(argp, &op->u.lockt); 1078 break; 1079 case OP_LOCKU: 1080 op->status = nfsd4_decode_locku(argp, &op->u.locku); 1081 break; 1082 case OP_LOOKUP: 1083 op->status = nfsd4_decode_lookup(argp, &op->u.lookup); 1084 break; 1085 case OP_LOOKUPP: 1086 op->status = nfs_ok; 1087 break; 1088 case OP_NVERIFY: 1089 op->status = nfsd4_decode_verify(argp, &op->u.nverify); 1090 break; 1091 case OP_OPEN: 1092 op->status = nfsd4_decode_open(argp, &op->u.open); 1093 break; 1094 case OP_OPEN_CONFIRM: 1095 op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm); 1096 break; 1097 case OP_OPEN_DOWNGRADE: 1098 op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade); 1099 break; 1100 case OP_PUTFH: 1101 op->status = nfsd4_decode_putfh(argp, &op->u.putfh); 1102 break; 1103 case OP_PUTROOTFH: 1104 op->status = nfs_ok; 1105 break; 1106 case OP_READ: 1107 op->status = nfsd4_decode_read(argp, &op->u.read); 1108 break; 1109 case OP_READDIR: 1110 op->status = nfsd4_decode_readdir(argp, &op->u.readdir); 1111 break; 1112 case OP_READLINK: 1113 op->status = nfs_ok; 1114 break; 1115 case OP_REMOVE: 1116 op->status = nfsd4_decode_remove(argp, &op->u.remove); 1117 break; 1118 case OP_RENAME: 1119 op->status = nfsd4_decode_rename(argp, &op->u.rename); 1120 break; 1121 case OP_RESTOREFH: 1122 op->status = nfs_ok; 1123 break; 1124 case OP_RENEW: 1125 op->status = nfsd4_decode_renew(argp, &op->u.renew); 1126 break; 1127 case OP_SAVEFH: 1128 op->status = nfs_ok; 1129 break; 1130 case OP_SETATTR: 1131 op->status = nfsd4_decode_setattr(argp, &op->u.setattr); 1132 break; 1133 case OP_SETCLIENTID: 1134 op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid); 1135 break; 1136 case OP_SETCLIENTID_CONFIRM: 1137 op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm); 1138 break; 1139 case OP_VERIFY: 1140 op->status = nfsd4_decode_verify(argp, &op->u.verify); 1141 break; 1142 case OP_WRITE: 1143 op->status = nfsd4_decode_write(argp, &op->u.write); 1144 break; 1145 case OP_RELEASE_LOCKOWNER: 1146 op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner); 1147 break; 1148 default: 1149 op->opnum = OP_ILLEGAL; 1150 op->status = nfserr_op_illegal; 1151 break; 1152 } 1153 1154 if (op->status) { 1155 argp->opcnt = i+1; 1156 break; 1157 } 1158 } 1159 1160 DECODE_TAIL; 1161 } 1162 /* 1163 * END OF "GENERIC" DECODE ROUTINES. 1164 */ 1165 1166 /* 1167 * START OF "GENERIC" ENCODE ROUTINES. 1168 * These may look a little ugly since they are imported from a "generic" 1169 * set of XDR encode/decode routines which are intended to be shared by 1170 * all of our NFSv4 implementations (OpenBSD, MacOS X...). 1171 * 1172 * If the pain of reading these is too great, it should be a straightforward 1173 * task to translate them into Linux-specific versions which are more 1174 * consistent with the style used in NFSv2/v3... 1175 */ 1176 #define ENCODE_HEAD u32 *p 1177 1178 #define WRITE32(n) *p++ = htonl(n) 1179 #define WRITE64(n) do { \ 1180 *p++ = htonl((u32)((n) >> 32)); \ 1181 *p++ = htonl((u32)(n)); \ 1182 } while (0) 1183 #define WRITEMEM(ptr,nbytes) do { \ 1184 *(p + XDR_QUADLEN(nbytes) -1) = 0; \ 1185 memcpy(p, ptr, nbytes); \ 1186 p += XDR_QUADLEN(nbytes); \ 1187 } while (0) 1188 #define WRITECINFO(c) do { \ 1189 *p++ = htonl(c.atomic); \ 1190 *p++ = htonl(c.before_ctime_sec); \ 1191 *p++ = htonl(c.before_ctime_nsec); \ 1192 *p++ = htonl(c.after_ctime_sec); \ 1193 *p++ = htonl(c.after_ctime_nsec); \ 1194 } while (0) 1195 1196 #define RESERVE_SPACE(nbytes) do { \ 1197 p = resp->p; \ 1198 BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end); \ 1199 } while (0) 1200 #define ADJUST_ARGS() resp->p = p 1201 1202 /* 1203 * Header routine to setup seqid operation replay cache 1204 */ 1205 #define ENCODE_SEQID_OP_HEAD \ 1206 u32 *p; \ 1207 u32 *save; \ 1208 \ 1209 save = resp->p; 1210 1211 /* 1212 * Routine for encoding the result of a "seqid-mutating" NFSv4 operation. This 1213 * is where sequence id's are incremented, and the replay cache is filled. 1214 * Note that we increment sequence id's here, at the last moment, so we're sure 1215 * we know whether the error to be returned is a sequence id mutating error. 1216 */ 1217 1218 #define ENCODE_SEQID_OP_TAIL(stateowner) do { \ 1219 if (seqid_mutating_err(nfserr) && stateowner) { \ 1220 stateowner->so_seqid++; \ 1221 stateowner->so_replay.rp_status = nfserr; \ 1222 stateowner->so_replay.rp_buflen = \ 1223 (((char *)(resp)->p - (char *)save)); \ 1224 memcpy(stateowner->so_replay.rp_buf, save, \ 1225 stateowner->so_replay.rp_buflen); \ 1226 } } while (0); 1227 1228 1229 static u32 nfs4_ftypes[16] = { 1230 NF4BAD, NF4FIFO, NF4CHR, NF4BAD, 1231 NF4DIR, NF4BAD, NF4BLK, NF4BAD, 1232 NF4REG, NF4BAD, NF4LNK, NF4BAD, 1233 NF4SOCK, NF4BAD, NF4LNK, NF4BAD, 1234 }; 1235 1236 static int 1237 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group, 1238 u32 **p, int *buflen) 1239 { 1240 int status; 1241 1242 if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4) 1243 return nfserr_resource; 1244 if (whotype != NFS4_ACL_WHO_NAMED) 1245 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1)); 1246 else if (group) 1247 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1)); 1248 else 1249 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1)); 1250 if (status < 0) 1251 return nfserrno(status); 1252 *p = xdr_encode_opaque(*p, NULL, status); 1253 *buflen -= (XDR_QUADLEN(status) << 2) + 4; 1254 BUG_ON(*buflen < 0); 1255 return 0; 1256 } 1257 1258 static inline int 1259 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, u32 **p, int *buflen) 1260 { 1261 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen); 1262 } 1263 1264 static inline int 1265 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, u32 **p, int *buflen) 1266 { 1267 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen); 1268 } 1269 1270 static inline int 1271 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group, 1272 u32 **p, int *buflen) 1273 { 1274 return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen); 1275 } 1276 1277 1278 /* 1279 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle 1280 * ourselves. 1281 * 1282 * @countp is the buffer size in _words_; upon successful return this becomes 1283 * replaced with the number of words written. 1284 */ 1285 int 1286 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp, 1287 struct dentry *dentry, u32 *buffer, int *countp, u32 *bmval, 1288 struct svc_rqst *rqstp) 1289 { 1290 u32 bmval0 = bmval[0]; 1291 u32 bmval1 = bmval[1]; 1292 struct kstat stat; 1293 struct svc_fh tempfh; 1294 struct kstatfs statfs; 1295 int buflen = *countp << 2; 1296 u32 *attrlenp; 1297 u32 dummy; 1298 u64 dummy64; 1299 u32 *p = buffer; 1300 int status; 1301 int aclsupport = 0; 1302 struct nfs4_acl *acl = NULL; 1303 1304 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1); 1305 BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0); 1306 BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1); 1307 1308 status = vfs_getattr(exp->ex_mnt, dentry, &stat); 1309 if (status) 1310 goto out_nfserr; 1311 if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) || 1312 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE | 1313 FATTR4_WORD1_SPACE_TOTAL))) { 1314 status = vfs_statfs(dentry->d_inode->i_sb, &statfs); 1315 if (status) 1316 goto out_nfserr; 1317 } 1318 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) { 1319 fh_init(&tempfh, NFS4_FHSIZE); 1320 status = fh_compose(&tempfh, exp, dentry, NULL); 1321 if (status) 1322 goto out; 1323 fhp = &tempfh; 1324 } 1325 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT 1326 | FATTR4_WORD0_SUPPORTED_ATTRS)) { 1327 status = nfsd4_get_nfs4_acl(rqstp, dentry, &acl); 1328 aclsupport = (status == 0); 1329 if (bmval0 & FATTR4_WORD0_ACL) { 1330 if (status == -EOPNOTSUPP) 1331 bmval0 &= ~FATTR4_WORD0_ACL; 1332 else if (status == -EINVAL) { 1333 status = nfserr_attrnotsupp; 1334 goto out; 1335 } else if (status != 0) 1336 goto out_nfserr; 1337 } 1338 } 1339 if ((buflen -= 16) < 0) 1340 goto out_resource; 1341 1342 WRITE32(2); 1343 WRITE32(bmval0); 1344 WRITE32(bmval1); 1345 attrlenp = p++; /* to be backfilled later */ 1346 1347 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 1348 if ((buflen -= 12) < 0) 1349 goto out_resource; 1350 WRITE32(2); 1351 WRITE32(aclsupport ? 1352 NFSD_SUPPORTED_ATTRS_WORD0 : 1353 NFSD_SUPPORTED_ATTRS_WORD0 & ~FATTR4_WORD0_ACL); 1354 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1); 1355 } 1356 if (bmval0 & FATTR4_WORD0_TYPE) { 1357 if ((buflen -= 4) < 0) 1358 goto out_resource; 1359 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12]; 1360 if (dummy == NF4BAD) 1361 goto out_serverfault; 1362 WRITE32(dummy); 1363 } 1364 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) { 1365 if ((buflen -= 4) < 0) 1366 goto out_resource; 1367 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) 1368 WRITE32(NFS4_FH_PERSISTENT); 1369 else 1370 WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME); 1371 } 1372 if (bmval0 & FATTR4_WORD0_CHANGE) { 1373 /* 1374 * Note: This _must_ be consistent with the scheme for writing 1375 * change_info, so any changes made here must be reflected there 1376 * as well. (See xdr4.h:set_change_info() and the WRITECINFO() 1377 * macro above.) 1378 */ 1379 if ((buflen -= 8) < 0) 1380 goto out_resource; 1381 WRITE32(stat.ctime.tv_sec); 1382 WRITE32(stat.ctime.tv_nsec); 1383 } 1384 if (bmval0 & FATTR4_WORD0_SIZE) { 1385 if ((buflen -= 8) < 0) 1386 goto out_resource; 1387 WRITE64(stat.size); 1388 } 1389 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) { 1390 if ((buflen -= 4) < 0) 1391 goto out_resource; 1392 WRITE32(1); 1393 } 1394 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) { 1395 if ((buflen -= 4) < 0) 1396 goto out_resource; 1397 WRITE32(1); 1398 } 1399 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) { 1400 if ((buflen -= 4) < 0) 1401 goto out_resource; 1402 WRITE32(0); 1403 } 1404 if (bmval0 & FATTR4_WORD0_FSID) { 1405 if ((buflen -= 16) < 0) 1406 goto out_resource; 1407 if (is_fsid(fhp, rqstp->rq_reffh)) { 1408 WRITE64((u64)exp->ex_fsid); 1409 WRITE64((u64)0); 1410 } else { 1411 WRITE32(0); 1412 WRITE32(MAJOR(stat.dev)); 1413 WRITE32(0); 1414 WRITE32(MINOR(stat.dev)); 1415 } 1416 } 1417 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) { 1418 if ((buflen -= 4) < 0) 1419 goto out_resource; 1420 WRITE32(0); 1421 } 1422 if (bmval0 & FATTR4_WORD0_LEASE_TIME) { 1423 if ((buflen -= 4) < 0) 1424 goto out_resource; 1425 WRITE32(NFSD_LEASE_TIME); 1426 } 1427 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) { 1428 if ((buflen -= 4) < 0) 1429 goto out_resource; 1430 WRITE32(0); 1431 } 1432 if (bmval0 & FATTR4_WORD0_ACL) { 1433 struct nfs4_ace *ace; 1434 struct list_head *h; 1435 1436 if (acl == NULL) { 1437 if ((buflen -= 4) < 0) 1438 goto out_resource; 1439 1440 WRITE32(0); 1441 goto out_acl; 1442 } 1443 if ((buflen -= 4) < 0) 1444 goto out_resource; 1445 WRITE32(acl->naces); 1446 1447 list_for_each(h, &acl->ace_head) { 1448 ace = list_entry(h, struct nfs4_ace, l_ace); 1449 1450 if ((buflen -= 4*3) < 0) 1451 goto out_resource; 1452 WRITE32(ace->type); 1453 WRITE32(ace->flag); 1454 WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL); 1455 status = nfsd4_encode_aclname(rqstp, ace->whotype, 1456 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP, 1457 &p, &buflen); 1458 if (status == nfserr_resource) 1459 goto out_resource; 1460 if (status) 1461 goto out; 1462 } 1463 } 1464 out_acl: 1465 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) { 1466 if ((buflen -= 4) < 0) 1467 goto out_resource; 1468 WRITE32(aclsupport ? 1469 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0); 1470 } 1471 if (bmval0 & FATTR4_WORD0_CANSETTIME) { 1472 if ((buflen -= 4) < 0) 1473 goto out_resource; 1474 WRITE32(1); 1475 } 1476 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) { 1477 if ((buflen -= 4) < 0) 1478 goto out_resource; 1479 WRITE32(1); 1480 } 1481 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) { 1482 if ((buflen -= 4) < 0) 1483 goto out_resource; 1484 WRITE32(1); 1485 } 1486 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) { 1487 if ((buflen -= 4) < 0) 1488 goto out_resource; 1489 WRITE32(1); 1490 } 1491 if (bmval0 & FATTR4_WORD0_FILEHANDLE) { 1492 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4; 1493 if (buflen < 0) 1494 goto out_resource; 1495 WRITE32(fhp->fh_handle.fh_size); 1496 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size); 1497 } 1498 if (bmval0 & FATTR4_WORD0_FILEID) { 1499 if ((buflen -= 8) < 0) 1500 goto out_resource; 1501 WRITE64((u64) stat.ino); 1502 } 1503 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) { 1504 if ((buflen -= 8) < 0) 1505 goto out_resource; 1506 WRITE64((u64) statfs.f_ffree); 1507 } 1508 if (bmval0 & FATTR4_WORD0_FILES_FREE) { 1509 if ((buflen -= 8) < 0) 1510 goto out_resource; 1511 WRITE64((u64) statfs.f_ffree); 1512 } 1513 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) { 1514 if ((buflen -= 8) < 0) 1515 goto out_resource; 1516 WRITE64((u64) statfs.f_files); 1517 } 1518 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) { 1519 if ((buflen -= 4) < 0) 1520 goto out_resource; 1521 WRITE32(1); 1522 } 1523 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) { 1524 if ((buflen -= 8) < 0) 1525 goto out_resource; 1526 WRITE64(~(u64)0); 1527 } 1528 if (bmval0 & FATTR4_WORD0_MAXLINK) { 1529 if ((buflen -= 4) < 0) 1530 goto out_resource; 1531 WRITE32(255); 1532 } 1533 if (bmval0 & FATTR4_WORD0_MAXNAME) { 1534 if ((buflen -= 4) < 0) 1535 goto out_resource; 1536 WRITE32(~(u32) 0); 1537 } 1538 if (bmval0 & FATTR4_WORD0_MAXREAD) { 1539 if ((buflen -= 8) < 0) 1540 goto out_resource; 1541 WRITE64((u64) NFSSVC_MAXBLKSIZE); 1542 } 1543 if (bmval0 & FATTR4_WORD0_MAXWRITE) { 1544 if ((buflen -= 8) < 0) 1545 goto out_resource; 1546 WRITE64((u64) NFSSVC_MAXBLKSIZE); 1547 } 1548 if (bmval1 & FATTR4_WORD1_MODE) { 1549 if ((buflen -= 4) < 0) 1550 goto out_resource; 1551 WRITE32(stat.mode & S_IALLUGO); 1552 } 1553 if (bmval1 & FATTR4_WORD1_NO_TRUNC) { 1554 if ((buflen -= 4) < 0) 1555 goto out_resource; 1556 WRITE32(1); 1557 } 1558 if (bmval1 & FATTR4_WORD1_NUMLINKS) { 1559 if ((buflen -= 4) < 0) 1560 goto out_resource; 1561 WRITE32(stat.nlink); 1562 } 1563 if (bmval1 & FATTR4_WORD1_OWNER) { 1564 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen); 1565 if (status == nfserr_resource) 1566 goto out_resource; 1567 if (status) 1568 goto out; 1569 } 1570 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) { 1571 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen); 1572 if (status == nfserr_resource) 1573 goto out_resource; 1574 if (status) 1575 goto out; 1576 } 1577 if (bmval1 & FATTR4_WORD1_RAWDEV) { 1578 if ((buflen -= 8) < 0) 1579 goto out_resource; 1580 WRITE32((u32) MAJOR(stat.rdev)); 1581 WRITE32((u32) MINOR(stat.rdev)); 1582 } 1583 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) { 1584 if ((buflen -= 8) < 0) 1585 goto out_resource; 1586 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize; 1587 WRITE64(dummy64); 1588 } 1589 if (bmval1 & FATTR4_WORD1_SPACE_FREE) { 1590 if ((buflen -= 8) < 0) 1591 goto out_resource; 1592 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize; 1593 WRITE64(dummy64); 1594 } 1595 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) { 1596 if ((buflen -= 8) < 0) 1597 goto out_resource; 1598 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize; 1599 WRITE64(dummy64); 1600 } 1601 if (bmval1 & FATTR4_WORD1_SPACE_USED) { 1602 if ((buflen -= 8) < 0) 1603 goto out_resource; 1604 dummy64 = (u64)stat.blocks << 9; 1605 WRITE64(dummy64); 1606 } 1607 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) { 1608 if ((buflen -= 12) < 0) 1609 goto out_resource; 1610 WRITE32(0); 1611 WRITE32(stat.atime.tv_sec); 1612 WRITE32(stat.atime.tv_nsec); 1613 } 1614 if (bmval1 & FATTR4_WORD1_TIME_DELTA) { 1615 if ((buflen -= 12) < 0) 1616 goto out_resource; 1617 WRITE32(0); 1618 WRITE32(1); 1619 WRITE32(0); 1620 } 1621 if (bmval1 & FATTR4_WORD1_TIME_METADATA) { 1622 if ((buflen -= 12) < 0) 1623 goto out_resource; 1624 WRITE32(0); 1625 WRITE32(stat.ctime.tv_sec); 1626 WRITE32(stat.ctime.tv_nsec); 1627 } 1628 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) { 1629 if ((buflen -= 12) < 0) 1630 goto out_resource; 1631 WRITE32(0); 1632 WRITE32(stat.mtime.tv_sec); 1633 WRITE32(stat.mtime.tv_nsec); 1634 } 1635 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) { 1636 struct dentry *mnt_pnt, *mnt_root; 1637 1638 if ((buflen -= 8) < 0) 1639 goto out_resource; 1640 mnt_root = exp->ex_mnt->mnt_root; 1641 if (mnt_root->d_inode == dentry->d_inode) { 1642 mnt_pnt = exp->ex_mnt->mnt_mountpoint; 1643 WRITE64((u64) mnt_pnt->d_inode->i_ino); 1644 } else 1645 WRITE64((u64) stat.ino); 1646 } 1647 *attrlenp = htonl((char *)p - (char *)attrlenp - 4); 1648 *countp = p - buffer; 1649 status = nfs_ok; 1650 1651 out: 1652 nfs4_acl_free(acl); 1653 if (fhp == &tempfh) 1654 fh_put(&tempfh); 1655 return status; 1656 out_nfserr: 1657 status = nfserrno(status); 1658 goto out; 1659 out_resource: 1660 *countp = 0; 1661 status = nfserr_resource; 1662 goto out; 1663 out_serverfault: 1664 status = nfserr_serverfault; 1665 goto out; 1666 } 1667 1668 static int 1669 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd, 1670 const char *name, int namlen, u32 *p, int *buflen) 1671 { 1672 struct svc_export *exp = cd->rd_fhp->fh_export; 1673 struct dentry *dentry; 1674 int nfserr; 1675 1676 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen); 1677 if (IS_ERR(dentry)) 1678 return nfserrno(PTR_ERR(dentry)); 1679 1680 exp_get(exp); 1681 if (d_mountpoint(dentry)) { 1682 if (nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp)) { 1683 /* 1684 * -EAGAIN is the only error returned from 1685 * nfsd_cross_mnt() and it indicates that an 1686 * up-call has been initiated to fill in the export 1687 * options on exp. When the answer comes back, 1688 * this call will be retried. 1689 */ 1690 nfserr = nfserr_dropit; 1691 goto out_put; 1692 } 1693 1694 } 1695 nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval, 1696 cd->rd_rqstp); 1697 out_put: 1698 dput(dentry); 1699 exp_put(exp); 1700 return nfserr; 1701 } 1702 1703 static u32 * 1704 nfsd4_encode_rdattr_error(u32 *p, int buflen, int nfserr) 1705 { 1706 u32 *attrlenp; 1707 1708 if (buflen < 6) 1709 return NULL; 1710 *p++ = htonl(2); 1711 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */ 1712 *p++ = htonl(0); /* bmval1 */ 1713 1714 attrlenp = p++; 1715 *p++ = nfserr; /* no htonl */ 1716 *attrlenp = htonl((char *)p - (char *)attrlenp - 4); 1717 return p; 1718 } 1719 1720 static int 1721 nfsd4_encode_dirent(struct readdir_cd *ccd, const char *name, int namlen, 1722 loff_t offset, ino_t ino, unsigned int d_type) 1723 { 1724 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common); 1725 int buflen; 1726 u32 *p = cd->buffer; 1727 int nfserr = nfserr_toosmall; 1728 1729 /* In nfsv4, "." and ".." never make it onto the wire.. */ 1730 if (name && isdotent(name, namlen)) { 1731 cd->common.err = nfs_ok; 1732 return 0; 1733 } 1734 1735 if (cd->offset) 1736 xdr_encode_hyper(cd->offset, (u64) offset); 1737 1738 buflen = cd->buflen - 4 - XDR_QUADLEN(namlen); 1739 if (buflen < 0) 1740 goto fail; 1741 1742 *p++ = xdr_one; /* mark entry present */ 1743 cd->offset = p; /* remember pointer */ 1744 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */ 1745 p = xdr_encode_array(p, name, namlen); /* name length & name */ 1746 1747 nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen); 1748 switch (nfserr) { 1749 case nfs_ok: 1750 p += buflen; 1751 break; 1752 case nfserr_resource: 1753 nfserr = nfserr_toosmall; 1754 goto fail; 1755 case nfserr_dropit: 1756 goto fail; 1757 default: 1758 /* 1759 * If the client requested the RDATTR_ERROR attribute, 1760 * we stuff the error code into this attribute 1761 * and continue. If this attribute was not requested, 1762 * then in accordance with the spec, we fail the 1763 * entire READDIR operation(!) 1764 */ 1765 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)) 1766 goto fail; 1767 nfserr = nfserr_toosmall; 1768 p = nfsd4_encode_rdattr_error(p, buflen, nfserr); 1769 if (p == NULL) 1770 goto fail; 1771 } 1772 cd->buflen -= (p - cd->buffer); 1773 cd->buffer = p; 1774 cd->common.err = nfs_ok; 1775 return 0; 1776 fail: 1777 cd->common.err = nfserr; 1778 return -EINVAL; 1779 } 1780 1781 static void 1782 nfsd4_encode_access(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_access *access) 1783 { 1784 ENCODE_HEAD; 1785 1786 if (!nfserr) { 1787 RESERVE_SPACE(8); 1788 WRITE32(access->ac_supported); 1789 WRITE32(access->ac_resp_access); 1790 ADJUST_ARGS(); 1791 } 1792 } 1793 1794 static void 1795 nfsd4_encode_close(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_close *close) 1796 { 1797 ENCODE_SEQID_OP_HEAD; 1798 1799 if (!nfserr) { 1800 RESERVE_SPACE(sizeof(stateid_t)); 1801 WRITE32(close->cl_stateid.si_generation); 1802 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t)); 1803 ADJUST_ARGS(); 1804 } 1805 ENCODE_SEQID_OP_TAIL(close->cl_stateowner); 1806 } 1807 1808 1809 static void 1810 nfsd4_encode_commit(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_commit *commit) 1811 { 1812 ENCODE_HEAD; 1813 1814 if (!nfserr) { 1815 RESERVE_SPACE(8); 1816 WRITEMEM(commit->co_verf.data, 8); 1817 ADJUST_ARGS(); 1818 } 1819 } 1820 1821 static void 1822 nfsd4_encode_create(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_create *create) 1823 { 1824 ENCODE_HEAD; 1825 1826 if (!nfserr) { 1827 RESERVE_SPACE(32); 1828 WRITECINFO(create->cr_cinfo); 1829 WRITE32(2); 1830 WRITE32(create->cr_bmval[0]); 1831 WRITE32(create->cr_bmval[1]); 1832 ADJUST_ARGS(); 1833 } 1834 } 1835 1836 static int 1837 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_getattr *getattr) 1838 { 1839 struct svc_fh *fhp = getattr->ga_fhp; 1840 int buflen; 1841 1842 if (nfserr) 1843 return nfserr; 1844 1845 buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2); 1846 nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry, 1847 resp->p, &buflen, getattr->ga_bmval, 1848 resp->rqstp); 1849 1850 if (!nfserr) 1851 resp->p += buflen; 1852 return nfserr; 1853 } 1854 1855 static void 1856 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, int nfserr, struct svc_fh *fhp) 1857 { 1858 unsigned int len; 1859 ENCODE_HEAD; 1860 1861 if (!nfserr) { 1862 len = fhp->fh_handle.fh_size; 1863 RESERVE_SPACE(len + 4); 1864 WRITE32(len); 1865 WRITEMEM(&fhp->fh_handle.fh_base, len); 1866 ADJUST_ARGS(); 1867 } 1868 } 1869 1870 /* 1871 * Including all fields other than the name, a LOCK4denied structure requires 1872 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes. 1873 */ 1874 static void 1875 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld) 1876 { 1877 ENCODE_HEAD; 1878 1879 RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0)); 1880 WRITE64(ld->ld_start); 1881 WRITE64(ld->ld_length); 1882 WRITE32(ld->ld_type); 1883 if (ld->ld_sop) { 1884 WRITEMEM(&ld->ld_clientid, 8); 1885 WRITE32(ld->ld_sop->so_owner.len); 1886 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len); 1887 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner); 1888 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */ 1889 WRITE64((u64)0); /* clientid */ 1890 WRITE32(0); /* length of owner name */ 1891 } 1892 ADJUST_ARGS(); 1893 } 1894 1895 static void 1896 nfsd4_encode_lock(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lock *lock) 1897 { 1898 1899 ENCODE_SEQID_OP_HEAD; 1900 1901 if (!nfserr) { 1902 RESERVE_SPACE(4 + sizeof(stateid_t)); 1903 WRITE32(lock->lk_resp_stateid.si_generation); 1904 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t)); 1905 ADJUST_ARGS(); 1906 } else if (nfserr == nfserr_denied) 1907 nfsd4_encode_lock_denied(resp, &lock->lk_denied); 1908 1909 ENCODE_SEQID_OP_TAIL(lock->lk_stateowner); 1910 } 1911 1912 static void 1913 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lockt *lockt) 1914 { 1915 if (nfserr == nfserr_denied) 1916 nfsd4_encode_lock_denied(resp, &lockt->lt_denied); 1917 } 1918 1919 static void 1920 nfsd4_encode_locku(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_locku *locku) 1921 { 1922 ENCODE_SEQID_OP_HEAD; 1923 1924 if (!nfserr) { 1925 RESERVE_SPACE(sizeof(stateid_t)); 1926 WRITE32(locku->lu_stateid.si_generation); 1927 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t)); 1928 ADJUST_ARGS(); 1929 } 1930 1931 ENCODE_SEQID_OP_TAIL(locku->lu_stateowner); 1932 } 1933 1934 1935 static void 1936 nfsd4_encode_link(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_link *link) 1937 { 1938 ENCODE_HEAD; 1939 1940 if (!nfserr) { 1941 RESERVE_SPACE(20); 1942 WRITECINFO(link->li_cinfo); 1943 ADJUST_ARGS(); 1944 } 1945 } 1946 1947 1948 static void 1949 nfsd4_encode_open(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open *open) 1950 { 1951 ENCODE_SEQID_OP_HEAD; 1952 1953 if (nfserr) 1954 goto out; 1955 1956 RESERVE_SPACE(36 + sizeof(stateid_t)); 1957 WRITE32(open->op_stateid.si_generation); 1958 WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t)); 1959 WRITECINFO(open->op_cinfo); 1960 WRITE32(open->op_rflags); 1961 WRITE32(2); 1962 WRITE32(open->op_bmval[0]); 1963 WRITE32(open->op_bmval[1]); 1964 WRITE32(open->op_delegate_type); 1965 ADJUST_ARGS(); 1966 1967 switch (open->op_delegate_type) { 1968 case NFS4_OPEN_DELEGATE_NONE: 1969 break; 1970 case NFS4_OPEN_DELEGATE_READ: 1971 RESERVE_SPACE(20 + sizeof(stateid_t)); 1972 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t)); 1973 WRITE32(open->op_recall); 1974 1975 /* 1976 * TODO: ACE's in delegations 1977 */ 1978 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 1979 WRITE32(0); 1980 WRITE32(0); 1981 WRITE32(0); /* XXX: is NULL principal ok? */ 1982 ADJUST_ARGS(); 1983 break; 1984 case NFS4_OPEN_DELEGATE_WRITE: 1985 RESERVE_SPACE(32 + sizeof(stateid_t)); 1986 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t)); 1987 WRITE32(0); 1988 1989 /* 1990 * TODO: space_limit's in delegations 1991 */ 1992 WRITE32(NFS4_LIMIT_SIZE); 1993 WRITE32(~(u32)0); 1994 WRITE32(~(u32)0); 1995 1996 /* 1997 * TODO: ACE's in delegations 1998 */ 1999 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 2000 WRITE32(0); 2001 WRITE32(0); 2002 WRITE32(0); /* XXX: is NULL principal ok? */ 2003 ADJUST_ARGS(); 2004 break; 2005 default: 2006 BUG(); 2007 } 2008 /* XXX save filehandle here */ 2009 out: 2010 ENCODE_SEQID_OP_TAIL(open->op_stateowner); 2011 } 2012 2013 static void 2014 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_confirm *oc) 2015 { 2016 ENCODE_SEQID_OP_HEAD; 2017 2018 if (!nfserr) { 2019 RESERVE_SPACE(sizeof(stateid_t)); 2020 WRITE32(oc->oc_resp_stateid.si_generation); 2021 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t)); 2022 ADJUST_ARGS(); 2023 } 2024 2025 ENCODE_SEQID_OP_TAIL(oc->oc_stateowner); 2026 } 2027 2028 static void 2029 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_downgrade *od) 2030 { 2031 ENCODE_SEQID_OP_HEAD; 2032 2033 if (!nfserr) { 2034 RESERVE_SPACE(sizeof(stateid_t)); 2035 WRITE32(od->od_stateid.si_generation); 2036 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t)); 2037 ADJUST_ARGS(); 2038 } 2039 2040 ENCODE_SEQID_OP_TAIL(od->od_stateowner); 2041 } 2042 2043 static int 2044 nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_read *read) 2045 { 2046 u32 eof; 2047 int v, pn; 2048 unsigned long maxcount; 2049 long len; 2050 ENCODE_HEAD; 2051 2052 if (nfserr) 2053 return nfserr; 2054 if (resp->xbuf->page_len) 2055 return nfserr_resource; 2056 2057 RESERVE_SPACE(8); /* eof flag and byte count */ 2058 2059 maxcount = NFSSVC_MAXBLKSIZE; 2060 if (maxcount > read->rd_length) 2061 maxcount = read->rd_length; 2062 2063 len = maxcount; 2064 v = 0; 2065 while (len > 0) { 2066 pn = resp->rqstp->rq_resused; 2067 svc_take_page(resp->rqstp); 2068 read->rd_iov[v].iov_base = page_address(resp->rqstp->rq_respages[pn]); 2069 read->rd_iov[v].iov_len = len < PAGE_SIZE ? len : PAGE_SIZE; 2070 v++; 2071 len -= PAGE_SIZE; 2072 } 2073 read->rd_vlen = v; 2074 2075 nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp, 2076 read->rd_offset, read->rd_iov, read->rd_vlen, 2077 &maxcount); 2078 2079 if (nfserr == nfserr_symlink) 2080 nfserr = nfserr_inval; 2081 if (nfserr) 2082 return nfserr; 2083 eof = (read->rd_offset + maxcount >= read->rd_fhp->fh_dentry->d_inode->i_size); 2084 2085 WRITE32(eof); 2086 WRITE32(maxcount); 2087 ADJUST_ARGS(); 2088 resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base; 2089 2090 resp->xbuf->page_len = maxcount; 2091 2092 /* read zero bytes -> don't set up tail */ 2093 if(!maxcount) 2094 return 0; 2095 2096 /* set up page for remaining responses */ 2097 svc_take_page(resp->rqstp); 2098 resp->xbuf->tail[0].iov_base = 2099 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); 2100 resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1; 2101 resp->xbuf->tail[0].iov_len = 0; 2102 resp->p = resp->xbuf->tail[0].iov_base; 2103 resp->end = resp->p + PAGE_SIZE/4; 2104 2105 if (maxcount&3) { 2106 *(resp->p)++ = 0; 2107 resp->xbuf->tail[0].iov_base += maxcount&3; 2108 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3); 2109 } 2110 return 0; 2111 } 2112 2113 static int 2114 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readlink *readlink) 2115 { 2116 int maxcount; 2117 char *page; 2118 ENCODE_HEAD; 2119 2120 if (nfserr) 2121 return nfserr; 2122 if (resp->xbuf->page_len) 2123 return nfserr_resource; 2124 2125 svc_take_page(resp->rqstp); 2126 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); 2127 2128 maxcount = PAGE_SIZE; 2129 RESERVE_SPACE(4); 2130 2131 /* 2132 * XXX: By default, the ->readlink() VFS op will truncate symlinks 2133 * if they would overflow the buffer. Is this kosher in NFSv4? If 2134 * not, one easy fix is: if ->readlink() precisely fills the buffer, 2135 * assume that truncation occurred, and return NFS4ERR_RESOURCE. 2136 */ 2137 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount); 2138 if (nfserr == nfserr_isdir) 2139 return nfserr_inval; 2140 if (nfserr) 2141 return nfserr; 2142 2143 WRITE32(maxcount); 2144 ADJUST_ARGS(); 2145 resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base; 2146 2147 svc_take_page(resp->rqstp); 2148 resp->xbuf->tail[0].iov_base = 2149 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); 2150 resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1; 2151 resp->xbuf->tail[0].iov_len = 0; 2152 resp->p = resp->xbuf->tail[0].iov_base; 2153 resp->end = resp->p + PAGE_SIZE/4; 2154 2155 resp->xbuf->page_len = maxcount; 2156 if (maxcount&3) { 2157 *(resp->p)++ = 0; 2158 resp->xbuf->tail[0].iov_base += maxcount&3; 2159 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3); 2160 } 2161 return 0; 2162 } 2163 2164 static int 2165 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readdir *readdir) 2166 { 2167 int maxcount; 2168 loff_t offset; 2169 u32 *page, *savep; 2170 ENCODE_HEAD; 2171 2172 if (nfserr) 2173 return nfserr; 2174 if (resp->xbuf->page_len) 2175 return nfserr_resource; 2176 2177 RESERVE_SPACE(8); /* verifier */ 2178 savep = p; 2179 2180 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */ 2181 WRITE32(0); 2182 WRITE32(0); 2183 ADJUST_ARGS(); 2184 resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base; 2185 2186 maxcount = PAGE_SIZE; 2187 if (maxcount > readdir->rd_maxcount) 2188 maxcount = readdir->rd_maxcount; 2189 2190 /* 2191 * Convert from bytes to words, account for the two words already 2192 * written, make sure to leave two words at the end for the next 2193 * pointer and eof field. 2194 */ 2195 maxcount = (maxcount >> 2) - 4; 2196 if (maxcount < 0) { 2197 nfserr = nfserr_toosmall; 2198 goto err_no_verf; 2199 } 2200 2201 svc_take_page(resp->rqstp); 2202 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); 2203 readdir->common.err = 0; 2204 readdir->buflen = maxcount; 2205 readdir->buffer = page; 2206 readdir->offset = NULL; 2207 2208 offset = readdir->rd_cookie; 2209 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, 2210 &offset, 2211 &readdir->common, nfsd4_encode_dirent); 2212 if (nfserr == nfs_ok && 2213 readdir->common.err == nfserr_toosmall && 2214 readdir->buffer == page) 2215 nfserr = nfserr_toosmall; 2216 if (nfserr == nfserr_symlink) 2217 nfserr = nfserr_notdir; 2218 if (nfserr) 2219 goto err_no_verf; 2220 2221 if (readdir->offset) 2222 xdr_encode_hyper(readdir->offset, offset); 2223 2224 p = readdir->buffer; 2225 *p++ = 0; /* no more entries */ 2226 *p++ = htonl(readdir->common.err == nfserr_eof); 2227 resp->xbuf->page_len = ((char*)p) - (char*)page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); 2228 2229 /* allocate a page for the tail */ 2230 svc_take_page(resp->rqstp); 2231 resp->xbuf->tail[0].iov_base = 2232 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); 2233 resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1; 2234 resp->xbuf->tail[0].iov_len = 0; 2235 resp->p = resp->xbuf->tail[0].iov_base; 2236 resp->end = resp->p + PAGE_SIZE/4; 2237 2238 return 0; 2239 err_no_verf: 2240 p = savep; 2241 ADJUST_ARGS(); 2242 return nfserr; 2243 } 2244 2245 static void 2246 nfsd4_encode_remove(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_remove *remove) 2247 { 2248 ENCODE_HEAD; 2249 2250 if (!nfserr) { 2251 RESERVE_SPACE(20); 2252 WRITECINFO(remove->rm_cinfo); 2253 ADJUST_ARGS(); 2254 } 2255 } 2256 2257 static void 2258 nfsd4_encode_rename(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_rename *rename) 2259 { 2260 ENCODE_HEAD; 2261 2262 if (!nfserr) { 2263 RESERVE_SPACE(40); 2264 WRITECINFO(rename->rn_sinfo); 2265 WRITECINFO(rename->rn_tinfo); 2266 ADJUST_ARGS(); 2267 } 2268 } 2269 2270 /* 2271 * The SETATTR encode routine is special -- it always encodes a bitmap, 2272 * regardless of the error status. 2273 */ 2274 static void 2275 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setattr *setattr) 2276 { 2277 ENCODE_HEAD; 2278 2279 RESERVE_SPACE(12); 2280 if (nfserr) { 2281 WRITE32(2); 2282 WRITE32(0); 2283 WRITE32(0); 2284 } 2285 else { 2286 WRITE32(2); 2287 WRITE32(setattr->sa_bmval[0]); 2288 WRITE32(setattr->sa_bmval[1]); 2289 } 2290 ADJUST_ARGS(); 2291 } 2292 2293 static void 2294 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setclientid *scd) 2295 { 2296 ENCODE_HEAD; 2297 2298 if (!nfserr) { 2299 RESERVE_SPACE(8 + sizeof(nfs4_verifier)); 2300 WRITEMEM(&scd->se_clientid, 8); 2301 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier)); 2302 ADJUST_ARGS(); 2303 } 2304 else if (nfserr == nfserr_clid_inuse) { 2305 RESERVE_SPACE(8); 2306 WRITE32(0); 2307 WRITE32(0); 2308 ADJUST_ARGS(); 2309 } 2310 } 2311 2312 static void 2313 nfsd4_encode_write(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_write *write) 2314 { 2315 ENCODE_HEAD; 2316 2317 if (!nfserr) { 2318 RESERVE_SPACE(16); 2319 WRITE32(write->wr_bytes_written); 2320 WRITE32(write->wr_how_written); 2321 WRITEMEM(write->wr_verifier.data, 8); 2322 ADJUST_ARGS(); 2323 } 2324 } 2325 2326 void 2327 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) 2328 { 2329 u32 *statp; 2330 ENCODE_HEAD; 2331 2332 RESERVE_SPACE(8); 2333 WRITE32(op->opnum); 2334 statp = p++; /* to be backfilled at the end */ 2335 ADJUST_ARGS(); 2336 2337 switch (op->opnum) { 2338 case OP_ACCESS: 2339 nfsd4_encode_access(resp, op->status, &op->u.access); 2340 break; 2341 case OP_CLOSE: 2342 nfsd4_encode_close(resp, op->status, &op->u.close); 2343 break; 2344 case OP_COMMIT: 2345 nfsd4_encode_commit(resp, op->status, &op->u.commit); 2346 break; 2347 case OP_CREATE: 2348 nfsd4_encode_create(resp, op->status, &op->u.create); 2349 break; 2350 case OP_DELEGRETURN: 2351 break; 2352 case OP_GETATTR: 2353 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr); 2354 break; 2355 case OP_GETFH: 2356 nfsd4_encode_getfh(resp, op->status, op->u.getfh); 2357 break; 2358 case OP_LINK: 2359 nfsd4_encode_link(resp, op->status, &op->u.link); 2360 break; 2361 case OP_LOCK: 2362 nfsd4_encode_lock(resp, op->status, &op->u.lock); 2363 break; 2364 case OP_LOCKT: 2365 nfsd4_encode_lockt(resp, op->status, &op->u.lockt); 2366 break; 2367 case OP_LOCKU: 2368 nfsd4_encode_locku(resp, op->status, &op->u.locku); 2369 break; 2370 case OP_LOOKUP: 2371 break; 2372 case OP_LOOKUPP: 2373 break; 2374 case OP_NVERIFY: 2375 break; 2376 case OP_OPEN: 2377 nfsd4_encode_open(resp, op->status, &op->u.open); 2378 break; 2379 case OP_OPEN_CONFIRM: 2380 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm); 2381 break; 2382 case OP_OPEN_DOWNGRADE: 2383 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade); 2384 break; 2385 case OP_PUTFH: 2386 break; 2387 case OP_PUTROOTFH: 2388 break; 2389 case OP_READ: 2390 op->status = nfsd4_encode_read(resp, op->status, &op->u.read); 2391 break; 2392 case OP_READDIR: 2393 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir); 2394 break; 2395 case OP_READLINK: 2396 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink); 2397 break; 2398 case OP_REMOVE: 2399 nfsd4_encode_remove(resp, op->status, &op->u.remove); 2400 break; 2401 case OP_RENAME: 2402 nfsd4_encode_rename(resp, op->status, &op->u.rename); 2403 break; 2404 case OP_RENEW: 2405 break; 2406 case OP_RESTOREFH: 2407 break; 2408 case OP_SAVEFH: 2409 break; 2410 case OP_SETATTR: 2411 nfsd4_encode_setattr(resp, op->status, &op->u.setattr); 2412 break; 2413 case OP_SETCLIENTID: 2414 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid); 2415 break; 2416 case OP_SETCLIENTID_CONFIRM: 2417 break; 2418 case OP_VERIFY: 2419 break; 2420 case OP_WRITE: 2421 nfsd4_encode_write(resp, op->status, &op->u.write); 2422 break; 2423 case OP_RELEASE_LOCKOWNER: 2424 break; 2425 default: 2426 break; 2427 } 2428 2429 /* 2430 * Note: We write the status directly, instead of using WRITE32(), 2431 * since it is already in network byte order. 2432 */ 2433 *statp = op->status; 2434 } 2435 2436 /* 2437 * Encode the reply stored in the stateowner reply cache 2438 * 2439 * XDR note: do not encode rp->rp_buflen: the buffer contains the 2440 * previously sent already encoded operation. 2441 * 2442 * called with nfs4_lock_state() held 2443 */ 2444 void 2445 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op) 2446 { 2447 ENCODE_HEAD; 2448 struct nfs4_replay *rp = op->replay; 2449 2450 BUG_ON(!rp); 2451 2452 RESERVE_SPACE(8); 2453 WRITE32(op->opnum); 2454 *p++ = rp->rp_status; /* already xdr'ed */ 2455 ADJUST_ARGS(); 2456 2457 RESERVE_SPACE(rp->rp_buflen); 2458 WRITEMEM(rp->rp_buf, rp->rp_buflen); 2459 ADJUST_ARGS(); 2460 } 2461 2462 /* 2463 * END OF "GENERIC" ENCODE ROUTINES. 2464 */ 2465 2466 int 2467 nfs4svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy) 2468 { 2469 return xdr_ressize_check(rqstp, p); 2470 } 2471 2472 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args) 2473 { 2474 if (args->ops != args->iops) { 2475 kfree(args->ops); 2476 args->ops = args->iops; 2477 } 2478 kfree(args->tmpp); 2479 args->tmpp = NULL; 2480 while (args->to_free) { 2481 struct tmpbuf *tb = args->to_free; 2482 args->to_free = tb->next; 2483 tb->release(tb->buf); 2484 kfree(tb); 2485 } 2486 } 2487 2488 int 2489 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundargs *args) 2490 { 2491 int status; 2492 2493 args->p = p; 2494 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len; 2495 args->pagelist = rqstp->rq_arg.pages; 2496 args->pagelen = rqstp->rq_arg.page_len; 2497 args->tmpp = NULL; 2498 args->to_free = NULL; 2499 args->ops = args->iops; 2500 args->rqstp = rqstp; 2501 2502 status = nfsd4_decode_compound(args); 2503 if (status) { 2504 nfsd4_release_compoundargs(args); 2505 } 2506 return !status; 2507 } 2508 2509 int 2510 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundres *resp) 2511 { 2512 /* 2513 * All that remains is to write the tag and operation count... 2514 */ 2515 struct kvec *iov; 2516 p = resp->tagp; 2517 *p++ = htonl(resp->taglen); 2518 memcpy(p, resp->tag, resp->taglen); 2519 p += XDR_QUADLEN(resp->taglen); 2520 *p++ = htonl(resp->opcnt); 2521 2522 if (rqstp->rq_res.page_len) 2523 iov = &rqstp->rq_res.tail[0]; 2524 else 2525 iov = &rqstp->rq_res.head[0]; 2526 iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base; 2527 BUG_ON(iov->iov_len > PAGE_SIZE); 2528 return 1; 2529 } 2530 2531 /* 2532 * Local variables: 2533 * c-basic-offset: 8 2534 * End: 2535 */ 2536