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 if (argp->tmpp) 155 kfree(argp->tmpp); 156 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL); 157 if (!p) 158 return NULL; 159 160 } 161 memcpy(p, argp->p, avail); 162 /* step to next page */ 163 argp->p = page_address(argp->pagelist[0]); 164 argp->pagelist++; 165 if (argp->pagelen < PAGE_SIZE) { 166 argp->end = p + (argp->pagelen>>2); 167 argp->pagelen = 0; 168 } else { 169 argp->end = p + (PAGE_SIZE>>2); 170 argp->pagelen -= PAGE_SIZE; 171 } 172 memcpy(((char*)p)+avail, argp->p, (nbytes - avail)); 173 argp->p += XDR_QUADLEN(nbytes - avail); 174 return p; 175 } 176 177 static int 178 defer_free(struct nfsd4_compoundargs *argp, 179 void (*release)(const void *), void *p) 180 { 181 struct tmpbuf *tb; 182 183 tb = kmalloc(sizeof(*tb), GFP_KERNEL); 184 if (!tb) 185 return -ENOMEM; 186 tb->buf = p; 187 tb->release = release; 188 tb->next = argp->to_free; 189 argp->to_free = tb; 190 return 0; 191 } 192 193 static char *savemem(struct nfsd4_compoundargs *argp, u32 *p, int nbytes) 194 { 195 void *new = NULL; 196 if (p == argp->tmp) { 197 new = kmalloc(nbytes, GFP_KERNEL); 198 if (!new) return NULL; 199 p = new; 200 memcpy(p, argp->tmp, nbytes); 201 } else { 202 if (p != argp->tmpp) 203 BUG(); 204 argp->tmpp = NULL; 205 } 206 if (defer_free(argp, kfree, p)) { 207 kfree(new); 208 return NULL; 209 } else 210 return (char *)p; 211 } 212 213 214 static int 215 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval) 216 { 217 u32 bmlen; 218 DECODE_HEAD; 219 220 bmval[0] = 0; 221 bmval[1] = 0; 222 223 READ_BUF(4); 224 READ32(bmlen); 225 if (bmlen > 1000) 226 goto xdr_error; 227 228 READ_BUF(bmlen << 2); 229 if (bmlen > 0) 230 READ32(bmval[0]); 231 if (bmlen > 1) 232 READ32(bmval[1]); 233 234 DECODE_TAIL; 235 } 236 237 static int 238 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr, 239 struct nfs4_acl **acl) 240 { 241 int expected_len, len = 0; 242 u32 dummy32; 243 char *buf; 244 245 DECODE_HEAD; 246 iattr->ia_valid = 0; 247 if ((status = nfsd4_decode_bitmap(argp, bmval))) 248 return status; 249 250 /* 251 * According to spec, unsupported attributes return ERR_NOTSUPP; 252 * read-only attributes return ERR_INVAL. 253 */ 254 if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1)) 255 return nfserr_attrnotsupp; 256 if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1)) 257 return nfserr_inval; 258 259 READ_BUF(4); 260 READ32(expected_len); 261 262 if (bmval[0] & FATTR4_WORD0_SIZE) { 263 READ_BUF(8); 264 len += 8; 265 READ64(iattr->ia_size); 266 iattr->ia_valid |= ATTR_SIZE; 267 } 268 if (bmval[0] & FATTR4_WORD0_ACL) { 269 int nace, i; 270 struct nfs4_ace ace; 271 272 READ_BUF(4); len += 4; 273 READ32(nace); 274 275 *acl = nfs4_acl_new(); 276 if (*acl == NULL) { 277 status = -ENOMEM; 278 goto out_nfserr; 279 } 280 defer_free(argp, (void (*)(const void *))nfs4_acl_free, *acl); 281 282 for (i = 0; i < nace; i++) { 283 READ_BUF(16); len += 16; 284 READ32(ace.type); 285 READ32(ace.flag); 286 READ32(ace.access_mask); 287 READ32(dummy32); 288 READ_BUF(dummy32); 289 len += XDR_QUADLEN(dummy32) << 2; 290 READMEM(buf, dummy32); 291 ace.whotype = nfs4_acl_get_whotype(buf, dummy32); 292 status = 0; 293 if (ace.whotype != NFS4_ACL_WHO_NAMED) 294 ace.who = 0; 295 else if (ace.flag & NFS4_ACE_IDENTIFIER_GROUP) 296 status = nfsd_map_name_to_gid(argp->rqstp, 297 buf, dummy32, &ace.who); 298 else 299 status = nfsd_map_name_to_uid(argp->rqstp, 300 buf, dummy32, &ace.who); 301 if (status) 302 goto out_nfserr; 303 if (nfs4_acl_add_ace(*acl, ace.type, ace.flag, 304 ace.access_mask, ace.whotype, ace.who) != 0) { 305 status = -ENOMEM; 306 goto out_nfserr; 307 } 308 } 309 } else 310 *acl = NULL; 311 if (bmval[1] & FATTR4_WORD1_MODE) { 312 READ_BUF(4); 313 len += 4; 314 READ32(iattr->ia_mode); 315 iattr->ia_mode &= (S_IFMT | S_IALLUGO); 316 iattr->ia_valid |= ATTR_MODE; 317 } 318 if (bmval[1] & FATTR4_WORD1_OWNER) { 319 READ_BUF(4); 320 len += 4; 321 READ32(dummy32); 322 READ_BUF(dummy32); 323 len += (XDR_QUADLEN(dummy32) << 2); 324 READMEM(buf, dummy32); 325 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid))) 326 goto out_nfserr; 327 iattr->ia_valid |= ATTR_UID; 328 } 329 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) { 330 READ_BUF(4); 331 len += 4; 332 READ32(dummy32); 333 READ_BUF(dummy32); 334 len += (XDR_QUADLEN(dummy32) << 2); 335 READMEM(buf, dummy32); 336 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid))) 337 goto out_nfserr; 338 iattr->ia_valid |= ATTR_GID; 339 } 340 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) { 341 READ_BUF(4); 342 len += 4; 343 READ32(dummy32); 344 switch (dummy32) { 345 case NFS4_SET_TO_CLIENT_TIME: 346 /* We require the high 32 bits of 'seconds' to be 0, and we ignore 347 all 32 bits of 'nseconds'. */ 348 READ_BUF(12); 349 len += 12; 350 READ32(dummy32); 351 if (dummy32) 352 return nfserr_inval; 353 READ32(iattr->ia_atime.tv_sec); 354 READ32(iattr->ia_atime.tv_nsec); 355 if (iattr->ia_atime.tv_nsec >= (u32)1000000000) 356 return nfserr_inval; 357 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET); 358 break; 359 case NFS4_SET_TO_SERVER_TIME: 360 iattr->ia_valid |= ATTR_ATIME; 361 break; 362 default: 363 goto xdr_error; 364 } 365 } 366 if (bmval[1] & FATTR4_WORD1_TIME_METADATA) { 367 /* We require the high 32 bits of 'seconds' to be 0, and we ignore 368 all 32 bits of 'nseconds'. */ 369 READ_BUF(12); 370 len += 12; 371 READ32(dummy32); 372 if (dummy32) 373 return nfserr_inval; 374 READ32(iattr->ia_ctime.tv_sec); 375 READ32(iattr->ia_ctime.tv_nsec); 376 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000) 377 return nfserr_inval; 378 iattr->ia_valid |= ATTR_CTIME; 379 } 380 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) { 381 READ_BUF(4); 382 len += 4; 383 READ32(dummy32); 384 switch (dummy32) { 385 case NFS4_SET_TO_CLIENT_TIME: 386 /* We require the high 32 bits of 'seconds' to be 0, and we ignore 387 all 32 bits of 'nseconds'. */ 388 READ_BUF(12); 389 len += 12; 390 READ32(dummy32); 391 if (dummy32) 392 return nfserr_inval; 393 READ32(iattr->ia_mtime.tv_sec); 394 READ32(iattr->ia_mtime.tv_nsec); 395 if (iattr->ia_mtime.tv_nsec >= (u32)1000000000) 396 return nfserr_inval; 397 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET); 398 break; 399 case NFS4_SET_TO_SERVER_TIME: 400 iattr->ia_valid |= ATTR_MTIME; 401 break; 402 default: 403 goto xdr_error; 404 } 405 } 406 if (len != expected_len) 407 goto xdr_error; 408 409 DECODE_TAIL; 410 411 out_nfserr: 412 status = nfserrno(status); 413 goto out; 414 } 415 416 static int 417 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access) 418 { 419 DECODE_HEAD; 420 421 READ_BUF(4); 422 READ32(access->ac_req_access); 423 424 DECODE_TAIL; 425 } 426 427 static int 428 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close) 429 { 430 DECODE_HEAD; 431 432 close->cl_stateowner = NULL; 433 READ_BUF(4 + sizeof(stateid_t)); 434 READ32(close->cl_seqid); 435 READ32(close->cl_stateid.si_generation); 436 COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t)); 437 438 DECODE_TAIL; 439 } 440 441 442 static int 443 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit) 444 { 445 DECODE_HEAD; 446 447 READ_BUF(12); 448 READ64(commit->co_offset); 449 READ32(commit->co_count); 450 451 DECODE_TAIL; 452 } 453 454 static int 455 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create) 456 { 457 DECODE_HEAD; 458 459 READ_BUF(4); 460 READ32(create->cr_type); 461 switch (create->cr_type) { 462 case NF4LNK: 463 READ_BUF(4); 464 READ32(create->cr_linklen); 465 READ_BUF(create->cr_linklen); 466 SAVEMEM(create->cr_linkname, create->cr_linklen); 467 break; 468 case NF4BLK: 469 case NF4CHR: 470 READ_BUF(8); 471 READ32(create->cr_specdata1); 472 READ32(create->cr_specdata2); 473 break; 474 case NF4SOCK: 475 case NF4FIFO: 476 case NF4DIR: 477 default: 478 break; 479 } 480 481 READ_BUF(4); 482 READ32(create->cr_namelen); 483 READ_BUF(create->cr_namelen); 484 SAVEMEM(create->cr_name, create->cr_namelen); 485 if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval))) 486 return status; 487 488 if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl))) 489 goto out; 490 491 DECODE_TAIL; 492 } 493 494 static inline int 495 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr) 496 { 497 DECODE_HEAD; 498 499 READ_BUF(sizeof(stateid_t)); 500 READ32(dr->dr_stateid.si_generation); 501 COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t)); 502 503 DECODE_TAIL; 504 } 505 506 static inline int 507 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr) 508 { 509 return nfsd4_decode_bitmap(argp, getattr->ga_bmval); 510 } 511 512 static int 513 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link) 514 { 515 DECODE_HEAD; 516 517 READ_BUF(4); 518 READ32(link->li_namelen); 519 READ_BUF(link->li_namelen); 520 SAVEMEM(link->li_name, link->li_namelen); 521 if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval))) 522 return status; 523 524 DECODE_TAIL; 525 } 526 527 static int 528 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock) 529 { 530 DECODE_HEAD; 531 532 lock->lk_stateowner = NULL; 533 /* 534 * type, reclaim(boolean), offset, length, new_lock_owner(boolean) 535 */ 536 READ_BUF(28); 537 READ32(lock->lk_type); 538 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT)) 539 goto xdr_error; 540 READ32(lock->lk_reclaim); 541 READ64(lock->lk_offset); 542 READ64(lock->lk_length); 543 READ32(lock->lk_is_new); 544 545 if (lock->lk_is_new) { 546 READ_BUF(36); 547 READ32(lock->lk_new_open_seqid); 548 READ32(lock->lk_new_open_stateid.si_generation); 549 550 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t)); 551 READ32(lock->lk_new_lock_seqid); 552 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t)); 553 READ32(lock->lk_new_owner.len); 554 READ_BUF(lock->lk_new_owner.len); 555 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len); 556 } else { 557 READ_BUF(20); 558 READ32(lock->lk_old_lock_stateid.si_generation); 559 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t)); 560 READ32(lock->lk_old_lock_seqid); 561 } 562 563 DECODE_TAIL; 564 } 565 566 static int 567 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt) 568 { 569 DECODE_HEAD; 570 571 READ_BUF(32); 572 READ32(lockt->lt_type); 573 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT)) 574 goto xdr_error; 575 READ64(lockt->lt_offset); 576 READ64(lockt->lt_length); 577 COPYMEM(&lockt->lt_clientid, 8); 578 READ32(lockt->lt_owner.len); 579 READ_BUF(lockt->lt_owner.len); 580 READMEM(lockt->lt_owner.data, lockt->lt_owner.len); 581 582 DECODE_TAIL; 583 } 584 585 static int 586 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku) 587 { 588 DECODE_HEAD; 589 590 locku->lu_stateowner = NULL; 591 READ_BUF(24 + sizeof(stateid_t)); 592 READ32(locku->lu_type); 593 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT)) 594 goto xdr_error; 595 READ32(locku->lu_seqid); 596 READ32(locku->lu_stateid.si_generation); 597 COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t)); 598 READ64(locku->lu_offset); 599 READ64(locku->lu_length); 600 601 DECODE_TAIL; 602 } 603 604 static int 605 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup) 606 { 607 DECODE_HEAD; 608 609 READ_BUF(4); 610 READ32(lookup->lo_len); 611 READ_BUF(lookup->lo_len); 612 SAVEMEM(lookup->lo_name, lookup->lo_len); 613 if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent))) 614 return status; 615 616 DECODE_TAIL; 617 } 618 619 static int 620 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 621 { 622 DECODE_HEAD; 623 624 memset(open->op_bmval, 0, sizeof(open->op_bmval)); 625 open->op_iattr.ia_valid = 0; 626 open->op_stateowner = NULL; 627 628 /* seqid, share_access, share_deny, clientid, ownerlen */ 629 READ_BUF(16 + sizeof(clientid_t)); 630 READ32(open->op_seqid); 631 READ32(open->op_share_access); 632 READ32(open->op_share_deny); 633 COPYMEM(&open->op_clientid, sizeof(clientid_t)); 634 READ32(open->op_owner.len); 635 636 /* owner, open_flag */ 637 READ_BUF(open->op_owner.len + 4); 638 SAVEMEM(open->op_owner.data, open->op_owner.len); 639 READ32(open->op_create); 640 switch (open->op_create) { 641 case NFS4_OPEN_NOCREATE: 642 break; 643 case NFS4_OPEN_CREATE: 644 READ_BUF(4); 645 READ32(open->op_createmode); 646 switch (open->op_createmode) { 647 case NFS4_CREATE_UNCHECKED: 648 case NFS4_CREATE_GUARDED: 649 if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl))) 650 goto out; 651 break; 652 case NFS4_CREATE_EXCLUSIVE: 653 READ_BUF(8); 654 COPYMEM(open->op_verf.data, 8); 655 break; 656 default: 657 goto xdr_error; 658 } 659 break; 660 default: 661 goto xdr_error; 662 } 663 664 /* open_claim */ 665 READ_BUF(4); 666 READ32(open->op_claim_type); 667 switch (open->op_claim_type) { 668 case NFS4_OPEN_CLAIM_NULL: 669 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 670 READ_BUF(4); 671 READ32(open->op_fname.len); 672 READ_BUF(open->op_fname.len); 673 SAVEMEM(open->op_fname.data, open->op_fname.len); 674 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval))) 675 return status; 676 break; 677 case NFS4_OPEN_CLAIM_PREVIOUS: 678 READ_BUF(4); 679 READ32(open->op_delegate_type); 680 break; 681 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 682 READ_BUF(sizeof(stateid_t) + 4); 683 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t)); 684 READ32(open->op_fname.len); 685 READ_BUF(open->op_fname.len); 686 SAVEMEM(open->op_fname.data, open->op_fname.len); 687 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval))) 688 return status; 689 break; 690 default: 691 goto xdr_error; 692 } 693 694 DECODE_TAIL; 695 } 696 697 static int 698 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf) 699 { 700 DECODE_HEAD; 701 702 open_conf->oc_stateowner = NULL; 703 READ_BUF(4 + sizeof(stateid_t)); 704 READ32(open_conf->oc_req_stateid.si_generation); 705 COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t)); 706 READ32(open_conf->oc_seqid); 707 708 DECODE_TAIL; 709 } 710 711 static int 712 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down) 713 { 714 DECODE_HEAD; 715 716 open_down->od_stateowner = NULL; 717 READ_BUF(12 + sizeof(stateid_t)); 718 READ32(open_down->od_stateid.si_generation); 719 COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t)); 720 READ32(open_down->od_seqid); 721 READ32(open_down->od_share_access); 722 READ32(open_down->od_share_deny); 723 724 DECODE_TAIL; 725 } 726 727 static int 728 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh) 729 { 730 DECODE_HEAD; 731 732 READ_BUF(4); 733 READ32(putfh->pf_fhlen); 734 if (putfh->pf_fhlen > NFS4_FHSIZE) 735 goto xdr_error; 736 READ_BUF(putfh->pf_fhlen); 737 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen); 738 739 DECODE_TAIL; 740 } 741 742 static int 743 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read) 744 { 745 DECODE_HEAD; 746 747 READ_BUF(sizeof(stateid_t) + 12); 748 READ32(read->rd_stateid.si_generation); 749 COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t)); 750 READ64(read->rd_offset); 751 READ32(read->rd_length); 752 753 DECODE_TAIL; 754 } 755 756 static int 757 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir) 758 { 759 DECODE_HEAD; 760 761 READ_BUF(24); 762 READ64(readdir->rd_cookie); 763 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data)); 764 READ32(readdir->rd_dircount); /* just in case you needed a useless field... */ 765 READ32(readdir->rd_maxcount); 766 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval))) 767 goto out; 768 769 DECODE_TAIL; 770 } 771 772 static int 773 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove) 774 { 775 DECODE_HEAD; 776 777 READ_BUF(4); 778 READ32(remove->rm_namelen); 779 READ_BUF(remove->rm_namelen); 780 SAVEMEM(remove->rm_name, remove->rm_namelen); 781 if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent))) 782 return status; 783 784 DECODE_TAIL; 785 } 786 787 static int 788 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename) 789 { 790 DECODE_HEAD; 791 792 READ_BUF(4); 793 READ32(rename->rn_snamelen); 794 READ_BUF(rename->rn_snamelen + 4); 795 SAVEMEM(rename->rn_sname, rename->rn_snamelen); 796 READ32(rename->rn_tnamelen); 797 READ_BUF(rename->rn_tnamelen); 798 SAVEMEM(rename->rn_tname, rename->rn_tnamelen); 799 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent))) 800 return status; 801 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval))) 802 return status; 803 804 DECODE_TAIL; 805 } 806 807 static int 808 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid) 809 { 810 DECODE_HEAD; 811 812 READ_BUF(sizeof(clientid_t)); 813 COPYMEM(clientid, sizeof(clientid_t)); 814 815 DECODE_TAIL; 816 } 817 818 static int 819 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr) 820 { 821 DECODE_HEAD; 822 823 READ_BUF(sizeof(stateid_t)); 824 READ32(setattr->sa_stateid.si_generation); 825 COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t)); 826 if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl))) 827 goto out; 828 829 DECODE_TAIL; 830 } 831 832 static int 833 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid) 834 { 835 DECODE_HEAD; 836 837 READ_BUF(12); 838 COPYMEM(setclientid->se_verf.data, 8); 839 READ32(setclientid->se_namelen); 840 841 READ_BUF(setclientid->se_namelen + 8); 842 SAVEMEM(setclientid->se_name, setclientid->se_namelen); 843 READ32(setclientid->se_callback_prog); 844 READ32(setclientid->se_callback_netid_len); 845 846 READ_BUF(setclientid->se_callback_netid_len + 4); 847 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len); 848 READ32(setclientid->se_callback_addr_len); 849 850 READ_BUF(setclientid->se_callback_addr_len + 4); 851 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len); 852 READ32(setclientid->se_callback_ident); 853 854 DECODE_TAIL; 855 } 856 857 static int 858 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c) 859 { 860 DECODE_HEAD; 861 862 READ_BUF(8 + sizeof(nfs4_verifier)); 863 COPYMEM(&scd_c->sc_clientid, 8); 864 COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier)); 865 866 DECODE_TAIL; 867 } 868 869 /* Also used for NVERIFY */ 870 static int 871 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify) 872 { 873 #if 0 874 struct nfsd4_compoundargs save = { 875 .p = argp->p, 876 .end = argp->end, 877 .rqstp = argp->rqstp, 878 }; 879 u32 ve_bmval[2]; 880 struct iattr ve_iattr; /* request */ 881 struct nfs4_acl *ve_acl; /* request */ 882 #endif 883 DECODE_HEAD; 884 885 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval))) 886 goto out; 887 888 /* For convenience's sake, we compare raw xdr'd attributes in 889 * nfsd4_proc_verify; however we still decode here just to return 890 * correct error in case of bad xdr. */ 891 #if 0 892 status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl); 893 if (status == nfserr_inval) { 894 status = nfserrno(status); 895 goto out; 896 } 897 #endif 898 READ_BUF(4); 899 READ32(verify->ve_attrlen); 900 READ_BUF(verify->ve_attrlen); 901 SAVEMEM(verify->ve_attrval, verify->ve_attrlen); 902 903 DECODE_TAIL; 904 } 905 906 static int 907 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write) 908 { 909 int avail; 910 int v; 911 int len; 912 DECODE_HEAD; 913 914 READ_BUF(sizeof(stateid_opaque_t) + 20); 915 READ32(write->wr_stateid.si_generation); 916 COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t)); 917 READ64(write->wr_offset); 918 READ32(write->wr_stable_how); 919 if (write->wr_stable_how > 2) 920 goto xdr_error; 921 READ32(write->wr_buflen); 922 923 /* Sorry .. no magic macros for this.. * 924 * READ_BUF(write->wr_buflen); 925 * SAVEMEM(write->wr_buf, write->wr_buflen); 926 */ 927 avail = (char*)argp->end - (char*)argp->p; 928 if (avail + argp->pagelen < write->wr_buflen) { 929 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); 930 goto xdr_error; 931 } 932 write->wr_vec[0].iov_base = p; 933 write->wr_vec[0].iov_len = avail; 934 v = 0; 935 len = write->wr_buflen; 936 while (len > write->wr_vec[v].iov_len) { 937 len -= write->wr_vec[v].iov_len; 938 v++; 939 write->wr_vec[v].iov_base = page_address(argp->pagelist[0]); 940 argp->pagelist++; 941 if (argp->pagelen >= PAGE_SIZE) { 942 write->wr_vec[v].iov_len = PAGE_SIZE; 943 argp->pagelen -= PAGE_SIZE; 944 } else { 945 write->wr_vec[v].iov_len = argp->pagelen; 946 argp->pagelen -= len; 947 } 948 } 949 argp->end = (u32*) (write->wr_vec[v].iov_base + write->wr_vec[v].iov_len); 950 argp->p = (u32*) (write->wr_vec[v].iov_base + (XDR_QUADLEN(len) << 2)); 951 write->wr_vec[v].iov_len = len; 952 write->wr_vlen = v+1; 953 954 DECODE_TAIL; 955 } 956 957 static int 958 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner) 959 { 960 DECODE_HEAD; 961 962 READ_BUF(12); 963 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t)); 964 READ32(rlockowner->rl_owner.len); 965 READ_BUF(rlockowner->rl_owner.len); 966 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len); 967 968 DECODE_TAIL; 969 } 970 971 static int 972 nfsd4_decode_compound(struct nfsd4_compoundargs *argp) 973 { 974 DECODE_HEAD; 975 struct nfsd4_op *op; 976 int i; 977 978 /* 979 * XXX: According to spec, we should check the tag 980 * for UTF-8 compliance. I'm postponing this for 981 * now because it seems that some clients do use 982 * binary tags. 983 */ 984 READ_BUF(4); 985 READ32(argp->taglen); 986 READ_BUF(argp->taglen + 8); 987 SAVEMEM(argp->tag, argp->taglen); 988 READ32(argp->minorversion); 989 READ32(argp->opcnt); 990 991 if (argp->taglen > NFSD4_MAX_TAGLEN) 992 goto xdr_error; 993 if (argp->opcnt > 100) 994 goto xdr_error; 995 996 if (argp->opcnt > sizeof(argp->iops)/sizeof(argp->iops[0])) { 997 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL); 998 if (!argp->ops) { 999 argp->ops = argp->iops; 1000 printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n"); 1001 goto xdr_error; 1002 } 1003 } 1004 1005 for (i = 0; i < argp->opcnt; i++) { 1006 op = &argp->ops[i]; 1007 op->replay = NULL; 1008 1009 /* 1010 * We can't use READ_BUF() here because we need to handle 1011 * a missing opcode as an OP_WRITE + 1. So we need to check 1012 * to see if we're truly at the end of our buffer or if there 1013 * is another page we need to flip to. 1014 */ 1015 1016 if (argp->p == argp->end) { 1017 if (argp->pagelen < 4) { 1018 /* There isn't an opcode still on the wire */ 1019 op->opnum = OP_WRITE + 1; 1020 op->status = nfserr_bad_xdr; 1021 argp->opcnt = i+1; 1022 break; 1023 } 1024 1025 /* 1026 * False alarm. We just hit a page boundary, but there 1027 * is still data available. Move pointer across page 1028 * boundary. *snip from READ_BUF* 1029 */ 1030 argp->p = page_address(argp->pagelist[0]); 1031 argp->pagelist++; 1032 if (argp->pagelen < PAGE_SIZE) { 1033 argp->end = p + (argp->pagelen>>2); 1034 argp->pagelen = 0; 1035 } else { 1036 argp->end = p + (PAGE_SIZE>>2); 1037 argp->pagelen -= PAGE_SIZE; 1038 } 1039 } 1040 op->opnum = ntohl(*argp->p++); 1041 1042 switch (op->opnum) { 1043 case 2: /* Reserved operation */ 1044 op->opnum = OP_ILLEGAL; 1045 if (argp->minorversion == 0) 1046 op->status = nfserr_op_illegal; 1047 else 1048 op->status = nfserr_minor_vers_mismatch; 1049 break; 1050 case OP_ACCESS: 1051 op->status = nfsd4_decode_access(argp, &op->u.access); 1052 break; 1053 case OP_CLOSE: 1054 op->status = nfsd4_decode_close(argp, &op->u.close); 1055 break; 1056 case OP_COMMIT: 1057 op->status = nfsd4_decode_commit(argp, &op->u.commit); 1058 break; 1059 case OP_CREATE: 1060 op->status = nfsd4_decode_create(argp, &op->u.create); 1061 break; 1062 case OP_DELEGRETURN: 1063 op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn); 1064 break; 1065 case OP_GETATTR: 1066 op->status = nfsd4_decode_getattr(argp, &op->u.getattr); 1067 break; 1068 case OP_GETFH: 1069 op->status = nfs_ok; 1070 break; 1071 case OP_LINK: 1072 op->status = nfsd4_decode_link(argp, &op->u.link); 1073 break; 1074 case OP_LOCK: 1075 op->status = nfsd4_decode_lock(argp, &op->u.lock); 1076 break; 1077 case OP_LOCKT: 1078 op->status = nfsd4_decode_lockt(argp, &op->u.lockt); 1079 break; 1080 case OP_LOCKU: 1081 op->status = nfsd4_decode_locku(argp, &op->u.locku); 1082 break; 1083 case OP_LOOKUP: 1084 op->status = nfsd4_decode_lookup(argp, &op->u.lookup); 1085 break; 1086 case OP_LOOKUPP: 1087 op->status = nfs_ok; 1088 break; 1089 case OP_NVERIFY: 1090 op->status = nfsd4_decode_verify(argp, &op->u.nverify); 1091 break; 1092 case OP_OPEN: 1093 op->status = nfsd4_decode_open(argp, &op->u.open); 1094 break; 1095 case OP_OPEN_CONFIRM: 1096 op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm); 1097 break; 1098 case OP_OPEN_DOWNGRADE: 1099 op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade); 1100 break; 1101 case OP_PUTFH: 1102 op->status = nfsd4_decode_putfh(argp, &op->u.putfh); 1103 break; 1104 case OP_PUTROOTFH: 1105 op->status = nfs_ok; 1106 break; 1107 case OP_READ: 1108 op->status = nfsd4_decode_read(argp, &op->u.read); 1109 break; 1110 case OP_READDIR: 1111 op->status = nfsd4_decode_readdir(argp, &op->u.readdir); 1112 break; 1113 case OP_READLINK: 1114 op->status = nfs_ok; 1115 break; 1116 case OP_REMOVE: 1117 op->status = nfsd4_decode_remove(argp, &op->u.remove); 1118 break; 1119 case OP_RENAME: 1120 op->status = nfsd4_decode_rename(argp, &op->u.rename); 1121 break; 1122 case OP_RESTOREFH: 1123 op->status = nfs_ok; 1124 break; 1125 case OP_RENEW: 1126 op->status = nfsd4_decode_renew(argp, &op->u.renew); 1127 break; 1128 case OP_SAVEFH: 1129 op->status = nfs_ok; 1130 break; 1131 case OP_SETATTR: 1132 op->status = nfsd4_decode_setattr(argp, &op->u.setattr); 1133 break; 1134 case OP_SETCLIENTID: 1135 op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid); 1136 break; 1137 case OP_SETCLIENTID_CONFIRM: 1138 op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm); 1139 break; 1140 case OP_VERIFY: 1141 op->status = nfsd4_decode_verify(argp, &op->u.verify); 1142 break; 1143 case OP_WRITE: 1144 op->status = nfsd4_decode_write(argp, &op->u.write); 1145 break; 1146 case OP_RELEASE_LOCKOWNER: 1147 op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner); 1148 break; 1149 default: 1150 op->opnum = OP_ILLEGAL; 1151 op->status = nfserr_op_illegal; 1152 break; 1153 } 1154 1155 if (op->status) { 1156 argp->opcnt = i+1; 1157 break; 1158 } 1159 } 1160 1161 DECODE_TAIL; 1162 } 1163 /* 1164 * END OF "GENERIC" DECODE ROUTINES. 1165 */ 1166 1167 /* 1168 * START OF "GENERIC" ENCODE ROUTINES. 1169 * These may look a little ugly since they are imported from a "generic" 1170 * set of XDR encode/decode routines which are intended to be shared by 1171 * all of our NFSv4 implementations (OpenBSD, MacOS X...). 1172 * 1173 * If the pain of reading these is too great, it should be a straightforward 1174 * task to translate them into Linux-specific versions which are more 1175 * consistent with the style used in NFSv2/v3... 1176 */ 1177 #define ENCODE_HEAD u32 *p 1178 1179 #define WRITE32(n) *p++ = htonl(n) 1180 #define WRITE64(n) do { \ 1181 *p++ = htonl((u32)((n) >> 32)); \ 1182 *p++ = htonl((u32)(n)); \ 1183 } while (0) 1184 #define WRITEMEM(ptr,nbytes) do { \ 1185 *(p + XDR_QUADLEN(nbytes) -1) = 0; \ 1186 memcpy(p, ptr, nbytes); \ 1187 p += XDR_QUADLEN(nbytes); \ 1188 } while (0) 1189 #define WRITECINFO(c) do { \ 1190 *p++ = htonl(c.atomic); \ 1191 *p++ = htonl(c.before_ctime_sec); \ 1192 *p++ = htonl(c.before_ctime_nsec); \ 1193 *p++ = htonl(c.after_ctime_sec); \ 1194 *p++ = htonl(c.after_ctime_nsec); \ 1195 } while (0) 1196 1197 #define RESERVE_SPACE(nbytes) do { \ 1198 p = resp->p; \ 1199 BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end); \ 1200 } while (0) 1201 #define ADJUST_ARGS() resp->p = p 1202 1203 /* 1204 * Header routine to setup seqid operation replay cache 1205 */ 1206 #define ENCODE_SEQID_OP_HEAD \ 1207 u32 *p; \ 1208 u32 *save; \ 1209 \ 1210 save = resp->p; 1211 1212 /* 1213 * Routine for encoding the result of a 1214 * "seqid-mutating" NFSv4 operation. This is 1215 * where seqids are incremented, and the 1216 * replay cache is filled. 1217 */ 1218 1219 #define ENCODE_SEQID_OP_TAIL(stateowner) do { \ 1220 if (seqid_mutating_err(nfserr) && stateowner) { \ 1221 if (stateowner->so_confirmed) \ 1222 stateowner->so_seqid++; \ 1223 stateowner->so_replay.rp_status = nfserr; \ 1224 stateowner->so_replay.rp_buflen = \ 1225 (((char *)(resp)->p - (char *)save)); \ 1226 memcpy(stateowner->so_replay.rp_buf, save, \ 1227 stateowner->so_replay.rp_buflen); \ 1228 } } while (0); 1229 1230 1231 static u32 nfs4_ftypes[16] = { 1232 NF4BAD, NF4FIFO, NF4CHR, NF4BAD, 1233 NF4DIR, NF4BAD, NF4BLK, NF4BAD, 1234 NF4REG, NF4BAD, NF4LNK, NF4BAD, 1235 NF4SOCK, NF4BAD, NF4LNK, NF4BAD, 1236 }; 1237 1238 static int 1239 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group, 1240 u32 **p, int *buflen) 1241 { 1242 int status; 1243 1244 if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4) 1245 return nfserr_resource; 1246 if (whotype != NFS4_ACL_WHO_NAMED) 1247 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1)); 1248 else if (group) 1249 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1)); 1250 else 1251 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1)); 1252 if (status < 0) 1253 return nfserrno(status); 1254 *p = xdr_encode_opaque(*p, NULL, status); 1255 *buflen -= (XDR_QUADLEN(status) << 2) + 4; 1256 BUG_ON(*buflen < 0); 1257 return 0; 1258 } 1259 1260 static inline int 1261 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, u32 **p, int *buflen) 1262 { 1263 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen); 1264 } 1265 1266 static inline int 1267 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, u32 **p, int *buflen) 1268 { 1269 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen); 1270 } 1271 1272 static inline int 1273 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group, 1274 u32 **p, int *buflen) 1275 { 1276 return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen); 1277 } 1278 1279 1280 /* 1281 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle 1282 * ourselves. 1283 * 1284 * @countp is the buffer size in _words_; upon successful return this becomes 1285 * replaced with the number of words written. 1286 */ 1287 int 1288 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp, 1289 struct dentry *dentry, u32 *buffer, int *countp, u32 *bmval, 1290 struct svc_rqst *rqstp) 1291 { 1292 u32 bmval0 = bmval[0]; 1293 u32 bmval1 = bmval[1]; 1294 struct kstat stat; 1295 struct svc_fh tempfh; 1296 struct kstatfs statfs; 1297 int buflen = *countp << 2; 1298 u32 *attrlenp; 1299 u32 dummy; 1300 u64 dummy64; 1301 u32 *p = buffer; 1302 int status; 1303 int aclsupport = 0; 1304 struct nfs4_acl *acl = NULL; 1305 1306 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1); 1307 BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0); 1308 BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1); 1309 1310 status = vfs_getattr(exp->ex_mnt, dentry, &stat); 1311 if (status) 1312 goto out_nfserr; 1313 if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) || 1314 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE | 1315 FATTR4_WORD1_SPACE_TOTAL))) { 1316 status = vfs_statfs(dentry->d_inode->i_sb, &statfs); 1317 if (status) 1318 goto out_nfserr; 1319 } 1320 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) { 1321 fh_init(&tempfh, NFS4_FHSIZE); 1322 status = fh_compose(&tempfh, exp, dentry, NULL); 1323 if (status) 1324 goto out; 1325 fhp = &tempfh; 1326 } 1327 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT 1328 | FATTR4_WORD0_SUPPORTED_ATTRS)) { 1329 status = nfsd4_get_nfs4_acl(rqstp, dentry, &acl); 1330 aclsupport = (status == 0); 1331 if (bmval0 & FATTR4_WORD0_ACL) { 1332 if (status == -EOPNOTSUPP) 1333 bmval0 &= ~FATTR4_WORD0_ACL; 1334 else if (status == -EINVAL) { 1335 status = nfserr_attrnotsupp; 1336 goto out; 1337 } else if (status != 0) 1338 goto out_nfserr; 1339 } 1340 } 1341 if ((buflen -= 16) < 0) 1342 goto out_resource; 1343 1344 WRITE32(2); 1345 WRITE32(bmval0); 1346 WRITE32(bmval1); 1347 attrlenp = p++; /* to be backfilled later */ 1348 1349 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 1350 if ((buflen -= 12) < 0) 1351 goto out_resource; 1352 WRITE32(2); 1353 WRITE32(aclsupport ? 1354 NFSD_SUPPORTED_ATTRS_WORD0 : 1355 NFSD_SUPPORTED_ATTRS_WORD0 & ~FATTR4_WORD0_ACL); 1356 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1); 1357 } 1358 if (bmval0 & FATTR4_WORD0_TYPE) { 1359 if ((buflen -= 4) < 0) 1360 goto out_resource; 1361 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12]; 1362 if (dummy == NF4BAD) 1363 goto out_serverfault; 1364 WRITE32(dummy); 1365 } 1366 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) { 1367 if ((buflen -= 4) < 0) 1368 goto out_resource; 1369 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) 1370 WRITE32(NFS4_FH_VOLATILE_ANY); 1371 else 1372 WRITE32(NFS4_FH_VOLATILE_ANY|NFS4_FH_VOL_RENAME); 1373 } 1374 if (bmval0 & FATTR4_WORD0_CHANGE) { 1375 /* 1376 * Note: This _must_ be consistent with the scheme for writing 1377 * change_info, so any changes made here must be reflected there 1378 * as well. (See xdr4.h:set_change_info() and the WRITECINFO() 1379 * macro above.) 1380 */ 1381 if ((buflen -= 8) < 0) 1382 goto out_resource; 1383 WRITE32(stat.ctime.tv_sec); 1384 WRITE32(stat.ctime.tv_nsec); 1385 } 1386 if (bmval0 & FATTR4_WORD0_SIZE) { 1387 if ((buflen -= 8) < 0) 1388 goto out_resource; 1389 WRITE64(stat.size); 1390 } 1391 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) { 1392 if ((buflen -= 4) < 0) 1393 goto out_resource; 1394 WRITE32(1); 1395 } 1396 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) { 1397 if ((buflen -= 4) < 0) 1398 goto out_resource; 1399 WRITE32(1); 1400 } 1401 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) { 1402 if ((buflen -= 4) < 0) 1403 goto out_resource; 1404 WRITE32(0); 1405 } 1406 if (bmval0 & FATTR4_WORD0_FSID) { 1407 if ((buflen -= 16) < 0) 1408 goto out_resource; 1409 if (is_fsid(fhp, rqstp->rq_reffh)) { 1410 WRITE64((u64)exp->ex_fsid); 1411 WRITE64((u64)0); 1412 } else { 1413 WRITE32(0); 1414 WRITE32(MAJOR(stat.dev)); 1415 WRITE32(0); 1416 WRITE32(MINOR(stat.dev)); 1417 } 1418 } 1419 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) { 1420 if ((buflen -= 4) < 0) 1421 goto out_resource; 1422 WRITE32(0); 1423 } 1424 if (bmval0 & FATTR4_WORD0_LEASE_TIME) { 1425 if ((buflen -= 4) < 0) 1426 goto out_resource; 1427 WRITE32(NFSD_LEASE_TIME); 1428 } 1429 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) { 1430 if ((buflen -= 4) < 0) 1431 goto out_resource; 1432 WRITE32(0); 1433 } 1434 if (bmval0 & FATTR4_WORD0_ACL) { 1435 struct nfs4_ace *ace; 1436 struct list_head *h; 1437 1438 if (acl == NULL) { 1439 if ((buflen -= 4) < 0) 1440 goto out_resource; 1441 1442 WRITE32(0); 1443 goto out_acl; 1444 } 1445 if ((buflen -= 4) < 0) 1446 goto out_resource; 1447 WRITE32(acl->naces); 1448 1449 list_for_each(h, &acl->ace_head) { 1450 ace = list_entry(h, struct nfs4_ace, l_ace); 1451 1452 if ((buflen -= 4*3) < 0) 1453 goto out_resource; 1454 WRITE32(ace->type); 1455 WRITE32(ace->flag); 1456 WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL); 1457 status = nfsd4_encode_aclname(rqstp, ace->whotype, 1458 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP, 1459 &p, &buflen); 1460 if (status == nfserr_resource) 1461 goto out_resource; 1462 if (status) 1463 goto out; 1464 } 1465 } 1466 out_acl: 1467 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) { 1468 if ((buflen -= 4) < 0) 1469 goto out_resource; 1470 WRITE32(aclsupport ? 1471 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0); 1472 } 1473 if (bmval0 & FATTR4_WORD0_CANSETTIME) { 1474 if ((buflen -= 4) < 0) 1475 goto out_resource; 1476 WRITE32(1); 1477 } 1478 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) { 1479 if ((buflen -= 4) < 0) 1480 goto out_resource; 1481 WRITE32(1); 1482 } 1483 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) { 1484 if ((buflen -= 4) < 0) 1485 goto out_resource; 1486 WRITE32(1); 1487 } 1488 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) { 1489 if ((buflen -= 4) < 0) 1490 goto out_resource; 1491 WRITE32(1); 1492 } 1493 if (bmval0 & FATTR4_WORD0_FILEHANDLE) { 1494 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4; 1495 if (buflen < 0) 1496 goto out_resource; 1497 WRITE32(fhp->fh_handle.fh_size); 1498 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size); 1499 } 1500 if (bmval0 & FATTR4_WORD0_FILEID) { 1501 if ((buflen -= 8) < 0) 1502 goto out_resource; 1503 WRITE64((u64) stat.ino); 1504 } 1505 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) { 1506 if ((buflen -= 8) < 0) 1507 goto out_resource; 1508 WRITE64((u64) statfs.f_ffree); 1509 } 1510 if (bmval0 & FATTR4_WORD0_FILES_FREE) { 1511 if ((buflen -= 8) < 0) 1512 goto out_resource; 1513 WRITE64((u64) statfs.f_ffree); 1514 } 1515 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) { 1516 if ((buflen -= 8) < 0) 1517 goto out_resource; 1518 WRITE64((u64) statfs.f_files); 1519 } 1520 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) { 1521 if ((buflen -= 4) < 0) 1522 goto out_resource; 1523 WRITE32(1); 1524 } 1525 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) { 1526 if ((buflen -= 8) < 0) 1527 goto out_resource; 1528 WRITE64(~(u64)0); 1529 } 1530 if (bmval0 & FATTR4_WORD0_MAXLINK) { 1531 if ((buflen -= 4) < 0) 1532 goto out_resource; 1533 WRITE32(255); 1534 } 1535 if (bmval0 & FATTR4_WORD0_MAXNAME) { 1536 if ((buflen -= 4) < 0) 1537 goto out_resource; 1538 WRITE32(~(u32) 0); 1539 } 1540 if (bmval0 & FATTR4_WORD0_MAXREAD) { 1541 if ((buflen -= 8) < 0) 1542 goto out_resource; 1543 WRITE64((u64) NFSSVC_MAXBLKSIZE); 1544 } 1545 if (bmval0 & FATTR4_WORD0_MAXWRITE) { 1546 if ((buflen -= 8) < 0) 1547 goto out_resource; 1548 WRITE64((u64) NFSSVC_MAXBLKSIZE); 1549 } 1550 if (bmval1 & FATTR4_WORD1_MODE) { 1551 if ((buflen -= 4) < 0) 1552 goto out_resource; 1553 WRITE32(stat.mode & S_IALLUGO); 1554 } 1555 if (bmval1 & FATTR4_WORD1_NO_TRUNC) { 1556 if ((buflen -= 4) < 0) 1557 goto out_resource; 1558 WRITE32(1); 1559 } 1560 if (bmval1 & FATTR4_WORD1_NUMLINKS) { 1561 if ((buflen -= 4) < 0) 1562 goto out_resource; 1563 WRITE32(stat.nlink); 1564 } 1565 if (bmval1 & FATTR4_WORD1_OWNER) { 1566 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen); 1567 if (status == nfserr_resource) 1568 goto out_resource; 1569 if (status) 1570 goto out; 1571 } 1572 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) { 1573 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen); 1574 if (status == nfserr_resource) 1575 goto out_resource; 1576 if (status) 1577 goto out; 1578 } 1579 if (bmval1 & FATTR4_WORD1_RAWDEV) { 1580 if ((buflen -= 8) < 0) 1581 goto out_resource; 1582 WRITE32((u32) MAJOR(stat.rdev)); 1583 WRITE32((u32) MINOR(stat.rdev)); 1584 } 1585 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) { 1586 if ((buflen -= 8) < 0) 1587 goto out_resource; 1588 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize; 1589 WRITE64(dummy64); 1590 } 1591 if (bmval1 & FATTR4_WORD1_SPACE_FREE) { 1592 if ((buflen -= 8) < 0) 1593 goto out_resource; 1594 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize; 1595 WRITE64(dummy64); 1596 } 1597 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) { 1598 if ((buflen -= 8) < 0) 1599 goto out_resource; 1600 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize; 1601 WRITE64(dummy64); 1602 } 1603 if (bmval1 & FATTR4_WORD1_SPACE_USED) { 1604 if ((buflen -= 8) < 0) 1605 goto out_resource; 1606 dummy64 = (u64)stat.blocks << 9; 1607 WRITE64(dummy64); 1608 } 1609 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) { 1610 if ((buflen -= 12) < 0) 1611 goto out_resource; 1612 WRITE32(0); 1613 WRITE32(stat.atime.tv_sec); 1614 WRITE32(stat.atime.tv_nsec); 1615 } 1616 if (bmval1 & FATTR4_WORD1_TIME_DELTA) { 1617 if ((buflen -= 12) < 0) 1618 goto out_resource; 1619 WRITE32(0); 1620 WRITE32(1); 1621 WRITE32(0); 1622 } 1623 if (bmval1 & FATTR4_WORD1_TIME_METADATA) { 1624 if ((buflen -= 12) < 0) 1625 goto out_resource; 1626 WRITE32(0); 1627 WRITE32(stat.ctime.tv_sec); 1628 WRITE32(stat.ctime.tv_nsec); 1629 } 1630 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) { 1631 if ((buflen -= 12) < 0) 1632 goto out_resource; 1633 WRITE32(0); 1634 WRITE32(stat.mtime.tv_sec); 1635 WRITE32(stat.mtime.tv_nsec); 1636 } 1637 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) { 1638 struct dentry *mnt_pnt, *mnt_root; 1639 1640 if ((buflen -= 8) < 0) 1641 goto out_resource; 1642 mnt_root = exp->ex_mnt->mnt_root; 1643 if (mnt_root->d_inode == dentry->d_inode) { 1644 mnt_pnt = exp->ex_mnt->mnt_mountpoint; 1645 WRITE64((u64) mnt_pnt->d_inode->i_ino); 1646 } else 1647 WRITE64((u64) stat.ino); 1648 } 1649 *attrlenp = htonl((char *)p - (char *)attrlenp - 4); 1650 *countp = p - buffer; 1651 status = nfs_ok; 1652 1653 out: 1654 nfs4_acl_free(acl); 1655 if (fhp == &tempfh) 1656 fh_put(&tempfh); 1657 return status; 1658 out_nfserr: 1659 status = nfserrno(status); 1660 goto out; 1661 out_resource: 1662 *countp = 0; 1663 status = nfserr_resource; 1664 goto out; 1665 out_serverfault: 1666 status = nfserr_serverfault; 1667 goto out; 1668 } 1669 1670 static int 1671 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd, 1672 const char *name, int namlen, u32 *p, int *buflen) 1673 { 1674 struct svc_export *exp = cd->rd_fhp->fh_export; 1675 struct dentry *dentry; 1676 int nfserr; 1677 1678 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen); 1679 if (IS_ERR(dentry)) 1680 return nfserrno(PTR_ERR(dentry)); 1681 1682 exp_get(exp); 1683 if (d_mountpoint(dentry)) { 1684 if (nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp)) { 1685 /* 1686 * -EAGAIN is the only error returned from 1687 * nfsd_cross_mnt() and it indicates that an 1688 * up-call has been initiated to fill in the export 1689 * options on exp. When the answer comes back, 1690 * this call will be retried. 1691 */ 1692 nfserr = nfserr_dropit; 1693 goto out_put; 1694 } 1695 1696 } 1697 nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval, 1698 cd->rd_rqstp); 1699 out_put: 1700 dput(dentry); 1701 exp_put(exp); 1702 return nfserr; 1703 } 1704 1705 static u32 * 1706 nfsd4_encode_rdattr_error(u32 *p, int buflen, int nfserr) 1707 { 1708 u32 *attrlenp; 1709 1710 if (buflen < 6) 1711 return NULL; 1712 *p++ = htonl(2); 1713 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */ 1714 *p++ = htonl(0); /* bmval1 */ 1715 1716 attrlenp = p++; 1717 *p++ = nfserr; /* no htonl */ 1718 *attrlenp = htonl((char *)p - (char *)attrlenp - 4); 1719 return p; 1720 } 1721 1722 static int 1723 nfsd4_encode_dirent(struct readdir_cd *ccd, const char *name, int namlen, 1724 loff_t offset, ino_t ino, unsigned int d_type) 1725 { 1726 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common); 1727 int buflen; 1728 u32 *p = cd->buffer; 1729 int nfserr = nfserr_toosmall; 1730 1731 /* In nfsv4, "." and ".." never make it onto the wire.. */ 1732 if (name && isdotent(name, namlen)) { 1733 cd->common.err = nfs_ok; 1734 return 0; 1735 } 1736 1737 if (cd->offset) 1738 xdr_encode_hyper(cd->offset, (u64) offset); 1739 1740 buflen = cd->buflen - 4 - XDR_QUADLEN(namlen); 1741 if (buflen < 0) 1742 goto fail; 1743 1744 *p++ = xdr_one; /* mark entry present */ 1745 cd->offset = p; /* remember pointer */ 1746 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */ 1747 p = xdr_encode_array(p, name, namlen); /* name length & name */ 1748 1749 nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen); 1750 switch (nfserr) { 1751 case nfs_ok: 1752 p += buflen; 1753 break; 1754 case nfserr_resource: 1755 nfserr = nfserr_toosmall; 1756 goto fail; 1757 case nfserr_dropit: 1758 goto fail; 1759 default: 1760 /* 1761 * If the client requested the RDATTR_ERROR attribute, 1762 * we stuff the error code into this attribute 1763 * and continue. If this attribute was not requested, 1764 * then in accordance with the spec, we fail the 1765 * entire READDIR operation(!) 1766 */ 1767 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)) 1768 goto fail; 1769 nfserr = nfserr_toosmall; 1770 p = nfsd4_encode_rdattr_error(p, buflen, nfserr); 1771 if (p == NULL) 1772 goto fail; 1773 } 1774 cd->buflen -= (p - cd->buffer); 1775 cd->buffer = p; 1776 cd->common.err = nfs_ok; 1777 return 0; 1778 fail: 1779 cd->common.err = nfserr; 1780 return -EINVAL; 1781 } 1782 1783 static void 1784 nfsd4_encode_access(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_access *access) 1785 { 1786 ENCODE_HEAD; 1787 1788 if (!nfserr) { 1789 RESERVE_SPACE(8); 1790 WRITE32(access->ac_supported); 1791 WRITE32(access->ac_resp_access); 1792 ADJUST_ARGS(); 1793 } 1794 } 1795 1796 static void 1797 nfsd4_encode_close(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_close *close) 1798 { 1799 ENCODE_SEQID_OP_HEAD; 1800 1801 if (!nfserr) { 1802 RESERVE_SPACE(sizeof(stateid_t)); 1803 WRITE32(close->cl_stateid.si_generation); 1804 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t)); 1805 ADJUST_ARGS(); 1806 } 1807 ENCODE_SEQID_OP_TAIL(close->cl_stateowner); 1808 } 1809 1810 1811 static void 1812 nfsd4_encode_commit(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_commit *commit) 1813 { 1814 ENCODE_HEAD; 1815 1816 if (!nfserr) { 1817 RESERVE_SPACE(8); 1818 WRITEMEM(commit->co_verf.data, 8); 1819 ADJUST_ARGS(); 1820 } 1821 } 1822 1823 static void 1824 nfsd4_encode_create(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_create *create) 1825 { 1826 ENCODE_HEAD; 1827 1828 if (!nfserr) { 1829 RESERVE_SPACE(32); 1830 WRITECINFO(create->cr_cinfo); 1831 WRITE32(2); 1832 WRITE32(create->cr_bmval[0]); 1833 WRITE32(create->cr_bmval[1]); 1834 ADJUST_ARGS(); 1835 } 1836 } 1837 1838 static int 1839 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_getattr *getattr) 1840 { 1841 struct svc_fh *fhp = getattr->ga_fhp; 1842 int buflen; 1843 1844 if (nfserr) 1845 return nfserr; 1846 1847 buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2); 1848 nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry, 1849 resp->p, &buflen, getattr->ga_bmval, 1850 resp->rqstp); 1851 1852 if (!nfserr) 1853 resp->p += buflen; 1854 return nfserr; 1855 } 1856 1857 static void 1858 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, int nfserr, struct svc_fh *fhp) 1859 { 1860 unsigned int len; 1861 ENCODE_HEAD; 1862 1863 if (!nfserr) { 1864 len = fhp->fh_handle.fh_size; 1865 RESERVE_SPACE(len + 4); 1866 WRITE32(len); 1867 WRITEMEM(&fhp->fh_handle.fh_base, len); 1868 ADJUST_ARGS(); 1869 } 1870 } 1871 1872 /* 1873 * Including all fields other than the name, a LOCK4denied structure requires 1874 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes. 1875 */ 1876 static void 1877 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld) 1878 { 1879 ENCODE_HEAD; 1880 1881 RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0)); 1882 WRITE64(ld->ld_start); 1883 WRITE64(ld->ld_length); 1884 WRITE32(ld->ld_type); 1885 if (ld->ld_sop) { 1886 WRITEMEM(&ld->ld_clientid, 8); 1887 WRITE32(ld->ld_sop->so_owner.len); 1888 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len); 1889 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner); 1890 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */ 1891 WRITE64((u64)0); /* clientid */ 1892 WRITE32(0); /* length of owner name */ 1893 } 1894 ADJUST_ARGS(); 1895 } 1896 1897 static void 1898 nfsd4_encode_lock(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lock *lock) 1899 { 1900 1901 ENCODE_SEQID_OP_HEAD; 1902 1903 if (!nfserr) { 1904 RESERVE_SPACE(4 + sizeof(stateid_t)); 1905 WRITE32(lock->lk_resp_stateid.si_generation); 1906 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t)); 1907 ADJUST_ARGS(); 1908 } else if (nfserr == nfserr_denied) 1909 nfsd4_encode_lock_denied(resp, &lock->lk_denied); 1910 1911 ENCODE_SEQID_OP_TAIL(lock->lk_stateowner); 1912 } 1913 1914 static void 1915 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lockt *lockt) 1916 { 1917 if (nfserr == nfserr_denied) 1918 nfsd4_encode_lock_denied(resp, &lockt->lt_denied); 1919 } 1920 1921 static void 1922 nfsd4_encode_locku(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_locku *locku) 1923 { 1924 ENCODE_SEQID_OP_HEAD; 1925 1926 if (!nfserr) { 1927 RESERVE_SPACE(sizeof(stateid_t)); 1928 WRITE32(locku->lu_stateid.si_generation); 1929 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t)); 1930 ADJUST_ARGS(); 1931 } 1932 1933 ENCODE_SEQID_OP_TAIL(locku->lu_stateowner); 1934 } 1935 1936 1937 static void 1938 nfsd4_encode_link(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_link *link) 1939 { 1940 ENCODE_HEAD; 1941 1942 if (!nfserr) { 1943 RESERVE_SPACE(20); 1944 WRITECINFO(link->li_cinfo); 1945 ADJUST_ARGS(); 1946 } 1947 } 1948 1949 1950 static void 1951 nfsd4_encode_open(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open *open) 1952 { 1953 ENCODE_SEQID_OP_HEAD; 1954 1955 if (nfserr) 1956 goto out; 1957 1958 RESERVE_SPACE(36 + sizeof(stateid_t)); 1959 WRITE32(open->op_stateid.si_generation); 1960 WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t)); 1961 WRITECINFO(open->op_cinfo); 1962 WRITE32(open->op_rflags); 1963 WRITE32(2); 1964 WRITE32(open->op_bmval[0]); 1965 WRITE32(open->op_bmval[1]); 1966 WRITE32(open->op_delegate_type); 1967 ADJUST_ARGS(); 1968 1969 switch (open->op_delegate_type) { 1970 case NFS4_OPEN_DELEGATE_NONE: 1971 break; 1972 case NFS4_OPEN_DELEGATE_READ: 1973 RESERVE_SPACE(20 + sizeof(stateid_t)); 1974 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t)); 1975 WRITE32(open->op_recall); 1976 1977 /* 1978 * TODO: ACE's in delegations 1979 */ 1980 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 1981 WRITE32(0); 1982 WRITE32(0); 1983 WRITE32(0); /* XXX: is NULL principal ok? */ 1984 ADJUST_ARGS(); 1985 break; 1986 case NFS4_OPEN_DELEGATE_WRITE: 1987 RESERVE_SPACE(32 + sizeof(stateid_t)); 1988 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t)); 1989 WRITE32(0); 1990 1991 /* 1992 * TODO: space_limit's in delegations 1993 */ 1994 WRITE32(NFS4_LIMIT_SIZE); 1995 WRITE32(~(u32)0); 1996 WRITE32(~(u32)0); 1997 1998 /* 1999 * TODO: ACE's in delegations 2000 */ 2001 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 2002 WRITE32(0); 2003 WRITE32(0); 2004 WRITE32(0); /* XXX: is NULL principal ok? */ 2005 ADJUST_ARGS(); 2006 break; 2007 default: 2008 BUG(); 2009 } 2010 /* XXX save filehandle here */ 2011 out: 2012 ENCODE_SEQID_OP_TAIL(open->op_stateowner); 2013 } 2014 2015 static void 2016 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_confirm *oc) 2017 { 2018 ENCODE_SEQID_OP_HEAD; 2019 2020 if (!nfserr) { 2021 RESERVE_SPACE(sizeof(stateid_t)); 2022 WRITE32(oc->oc_resp_stateid.si_generation); 2023 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t)); 2024 ADJUST_ARGS(); 2025 } 2026 2027 ENCODE_SEQID_OP_TAIL(oc->oc_stateowner); 2028 } 2029 2030 static void 2031 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_downgrade *od) 2032 { 2033 ENCODE_SEQID_OP_HEAD; 2034 2035 if (!nfserr) { 2036 RESERVE_SPACE(sizeof(stateid_t)); 2037 WRITE32(od->od_stateid.si_generation); 2038 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t)); 2039 ADJUST_ARGS(); 2040 } 2041 2042 ENCODE_SEQID_OP_TAIL(od->od_stateowner); 2043 } 2044 2045 static int 2046 nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_read *read) 2047 { 2048 u32 eof; 2049 int v, pn; 2050 unsigned long maxcount; 2051 long len; 2052 ENCODE_HEAD; 2053 2054 if (nfserr) 2055 return nfserr; 2056 if (resp->xbuf->page_len) 2057 return nfserr_resource; 2058 2059 RESERVE_SPACE(8); /* eof flag and byte count */ 2060 2061 maxcount = NFSSVC_MAXBLKSIZE; 2062 if (maxcount > read->rd_length) 2063 maxcount = read->rd_length; 2064 2065 len = maxcount; 2066 v = 0; 2067 while (len > 0) { 2068 pn = resp->rqstp->rq_resused; 2069 svc_take_page(resp->rqstp); 2070 read->rd_iov[v].iov_base = page_address(resp->rqstp->rq_respages[pn]); 2071 read->rd_iov[v].iov_len = len < PAGE_SIZE ? len : PAGE_SIZE; 2072 v++; 2073 len -= PAGE_SIZE; 2074 } 2075 read->rd_vlen = v; 2076 2077 nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp, 2078 read->rd_offset, read->rd_iov, read->rd_vlen, 2079 &maxcount); 2080 2081 if (nfserr == nfserr_symlink) 2082 nfserr = nfserr_inval; 2083 if (nfserr) 2084 return nfserr; 2085 eof = (read->rd_offset + maxcount >= read->rd_fhp->fh_dentry->d_inode->i_size); 2086 2087 WRITE32(eof); 2088 WRITE32(maxcount); 2089 ADJUST_ARGS(); 2090 resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base; 2091 2092 resp->xbuf->page_len = maxcount; 2093 2094 /* read zero bytes -> don't set up tail */ 2095 if(!maxcount) 2096 return 0; 2097 2098 /* set up page for remaining responses */ 2099 svc_take_page(resp->rqstp); 2100 resp->xbuf->tail[0].iov_base = 2101 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); 2102 resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1; 2103 resp->xbuf->tail[0].iov_len = 0; 2104 resp->p = resp->xbuf->tail[0].iov_base; 2105 resp->end = resp->p + PAGE_SIZE/4; 2106 2107 if (maxcount&3) { 2108 *(resp->p)++ = 0; 2109 resp->xbuf->tail[0].iov_base += maxcount&3; 2110 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3); 2111 } 2112 return 0; 2113 } 2114 2115 static int 2116 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readlink *readlink) 2117 { 2118 int maxcount; 2119 char *page; 2120 ENCODE_HEAD; 2121 2122 if (nfserr) 2123 return nfserr; 2124 if (resp->xbuf->page_len) 2125 return nfserr_resource; 2126 2127 svc_take_page(resp->rqstp); 2128 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); 2129 2130 maxcount = PAGE_SIZE; 2131 RESERVE_SPACE(4); 2132 2133 /* 2134 * XXX: By default, the ->readlink() VFS op will truncate symlinks 2135 * if they would overflow the buffer. Is this kosher in NFSv4? If 2136 * not, one easy fix is: if ->readlink() precisely fills the buffer, 2137 * assume that truncation occurred, and return NFS4ERR_RESOURCE. 2138 */ 2139 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount); 2140 if (nfserr == nfserr_isdir) 2141 return nfserr_inval; 2142 if (nfserr) 2143 return nfserr; 2144 2145 WRITE32(maxcount); 2146 ADJUST_ARGS(); 2147 resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base; 2148 2149 svc_take_page(resp->rqstp); 2150 resp->xbuf->tail[0].iov_base = 2151 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); 2152 resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1; 2153 resp->xbuf->tail[0].iov_len = 0; 2154 resp->p = resp->xbuf->tail[0].iov_base; 2155 resp->end = resp->p + PAGE_SIZE/4; 2156 2157 resp->xbuf->page_len = maxcount; 2158 if (maxcount&3) { 2159 *(resp->p)++ = 0; 2160 resp->xbuf->tail[0].iov_base += maxcount&3; 2161 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3); 2162 } 2163 return 0; 2164 } 2165 2166 static int 2167 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readdir *readdir) 2168 { 2169 int maxcount; 2170 loff_t offset; 2171 u32 *page, *savep; 2172 ENCODE_HEAD; 2173 2174 if (nfserr) 2175 return nfserr; 2176 if (resp->xbuf->page_len) 2177 return nfserr_resource; 2178 2179 RESERVE_SPACE(8); /* verifier */ 2180 savep = p; 2181 2182 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */ 2183 WRITE32(0); 2184 WRITE32(0); 2185 ADJUST_ARGS(); 2186 resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base; 2187 2188 maxcount = PAGE_SIZE; 2189 if (maxcount > readdir->rd_maxcount) 2190 maxcount = readdir->rd_maxcount; 2191 2192 /* 2193 * Convert from bytes to words, account for the two words already 2194 * written, make sure to leave two words at the end for the next 2195 * pointer and eof field. 2196 */ 2197 maxcount = (maxcount >> 2) - 4; 2198 if (maxcount < 0) { 2199 nfserr = nfserr_toosmall; 2200 goto err_no_verf; 2201 } 2202 2203 svc_take_page(resp->rqstp); 2204 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); 2205 readdir->common.err = 0; 2206 readdir->buflen = maxcount; 2207 readdir->buffer = page; 2208 readdir->offset = NULL; 2209 2210 offset = readdir->rd_cookie; 2211 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, 2212 &offset, 2213 &readdir->common, nfsd4_encode_dirent); 2214 if (nfserr == nfs_ok && 2215 readdir->common.err == nfserr_toosmall && 2216 readdir->buffer == page) 2217 nfserr = nfserr_toosmall; 2218 if (nfserr == nfserr_symlink) 2219 nfserr = nfserr_notdir; 2220 if (nfserr) 2221 goto err_no_verf; 2222 2223 if (readdir->offset) 2224 xdr_encode_hyper(readdir->offset, offset); 2225 2226 p = readdir->buffer; 2227 *p++ = 0; /* no more entries */ 2228 *p++ = htonl(readdir->common.err == nfserr_eof); 2229 resp->xbuf->page_len = ((char*)p) - (char*)page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); 2230 2231 /* allocate a page for the tail */ 2232 svc_take_page(resp->rqstp); 2233 resp->xbuf->tail[0].iov_base = 2234 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); 2235 resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1; 2236 resp->xbuf->tail[0].iov_len = 0; 2237 resp->p = resp->xbuf->tail[0].iov_base; 2238 resp->end = resp->p + PAGE_SIZE/4; 2239 2240 return 0; 2241 err_no_verf: 2242 p = savep; 2243 ADJUST_ARGS(); 2244 return nfserr; 2245 } 2246 2247 static void 2248 nfsd4_encode_remove(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_remove *remove) 2249 { 2250 ENCODE_HEAD; 2251 2252 if (!nfserr) { 2253 RESERVE_SPACE(20); 2254 WRITECINFO(remove->rm_cinfo); 2255 ADJUST_ARGS(); 2256 } 2257 } 2258 2259 static void 2260 nfsd4_encode_rename(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_rename *rename) 2261 { 2262 ENCODE_HEAD; 2263 2264 if (!nfserr) { 2265 RESERVE_SPACE(40); 2266 WRITECINFO(rename->rn_sinfo); 2267 WRITECINFO(rename->rn_tinfo); 2268 ADJUST_ARGS(); 2269 } 2270 } 2271 2272 /* 2273 * The SETATTR encode routine is special -- it always encodes a bitmap, 2274 * regardless of the error status. 2275 */ 2276 static void 2277 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setattr *setattr) 2278 { 2279 ENCODE_HEAD; 2280 2281 RESERVE_SPACE(12); 2282 if (nfserr) { 2283 WRITE32(2); 2284 WRITE32(0); 2285 WRITE32(0); 2286 } 2287 else { 2288 WRITE32(2); 2289 WRITE32(setattr->sa_bmval[0]); 2290 WRITE32(setattr->sa_bmval[1]); 2291 } 2292 ADJUST_ARGS(); 2293 } 2294 2295 static void 2296 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setclientid *scd) 2297 { 2298 ENCODE_HEAD; 2299 2300 if (!nfserr) { 2301 RESERVE_SPACE(8 + sizeof(nfs4_verifier)); 2302 WRITEMEM(&scd->se_clientid, 8); 2303 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier)); 2304 ADJUST_ARGS(); 2305 } 2306 else if (nfserr == nfserr_clid_inuse) { 2307 RESERVE_SPACE(8); 2308 WRITE32(0); 2309 WRITE32(0); 2310 ADJUST_ARGS(); 2311 } 2312 } 2313 2314 static void 2315 nfsd4_encode_write(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_write *write) 2316 { 2317 ENCODE_HEAD; 2318 2319 if (!nfserr) { 2320 RESERVE_SPACE(16); 2321 WRITE32(write->wr_bytes_written); 2322 WRITE32(write->wr_how_written); 2323 WRITEMEM(write->wr_verifier.data, 8); 2324 ADJUST_ARGS(); 2325 } 2326 } 2327 2328 void 2329 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) 2330 { 2331 u32 *statp; 2332 ENCODE_HEAD; 2333 2334 RESERVE_SPACE(8); 2335 WRITE32(op->opnum); 2336 statp = p++; /* to be backfilled at the end */ 2337 ADJUST_ARGS(); 2338 2339 switch (op->opnum) { 2340 case OP_ACCESS: 2341 nfsd4_encode_access(resp, op->status, &op->u.access); 2342 break; 2343 case OP_CLOSE: 2344 nfsd4_encode_close(resp, op->status, &op->u.close); 2345 break; 2346 case OP_COMMIT: 2347 nfsd4_encode_commit(resp, op->status, &op->u.commit); 2348 break; 2349 case OP_CREATE: 2350 nfsd4_encode_create(resp, op->status, &op->u.create); 2351 break; 2352 case OP_DELEGRETURN: 2353 break; 2354 case OP_GETATTR: 2355 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr); 2356 break; 2357 case OP_GETFH: 2358 nfsd4_encode_getfh(resp, op->status, op->u.getfh); 2359 break; 2360 case OP_LINK: 2361 nfsd4_encode_link(resp, op->status, &op->u.link); 2362 break; 2363 case OP_LOCK: 2364 nfsd4_encode_lock(resp, op->status, &op->u.lock); 2365 break; 2366 case OP_LOCKT: 2367 nfsd4_encode_lockt(resp, op->status, &op->u.lockt); 2368 break; 2369 case OP_LOCKU: 2370 nfsd4_encode_locku(resp, op->status, &op->u.locku); 2371 break; 2372 case OP_LOOKUP: 2373 break; 2374 case OP_LOOKUPP: 2375 break; 2376 case OP_NVERIFY: 2377 break; 2378 case OP_OPEN: 2379 nfsd4_encode_open(resp, op->status, &op->u.open); 2380 break; 2381 case OP_OPEN_CONFIRM: 2382 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm); 2383 break; 2384 case OP_OPEN_DOWNGRADE: 2385 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade); 2386 break; 2387 case OP_PUTFH: 2388 break; 2389 case OP_PUTROOTFH: 2390 break; 2391 case OP_READ: 2392 op->status = nfsd4_encode_read(resp, op->status, &op->u.read); 2393 break; 2394 case OP_READDIR: 2395 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir); 2396 break; 2397 case OP_READLINK: 2398 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink); 2399 break; 2400 case OP_REMOVE: 2401 nfsd4_encode_remove(resp, op->status, &op->u.remove); 2402 break; 2403 case OP_RENAME: 2404 nfsd4_encode_rename(resp, op->status, &op->u.rename); 2405 break; 2406 case OP_RENEW: 2407 break; 2408 case OP_RESTOREFH: 2409 break; 2410 case OP_SAVEFH: 2411 break; 2412 case OP_SETATTR: 2413 nfsd4_encode_setattr(resp, op->status, &op->u.setattr); 2414 break; 2415 case OP_SETCLIENTID: 2416 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid); 2417 break; 2418 case OP_SETCLIENTID_CONFIRM: 2419 break; 2420 case OP_VERIFY: 2421 break; 2422 case OP_WRITE: 2423 nfsd4_encode_write(resp, op->status, &op->u.write); 2424 break; 2425 case OP_RELEASE_LOCKOWNER: 2426 break; 2427 default: 2428 break; 2429 } 2430 2431 /* 2432 * Note: We write the status directly, instead of using WRITE32(), 2433 * since it is already in network byte order. 2434 */ 2435 *statp = op->status; 2436 } 2437 2438 /* 2439 * Encode the reply stored in the stateowner reply cache 2440 * 2441 * XDR note: do not encode rp->rp_buflen: the buffer contains the 2442 * previously sent already encoded operation. 2443 * 2444 * called with nfs4_lock_state() held 2445 */ 2446 void 2447 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op) 2448 { 2449 ENCODE_HEAD; 2450 struct nfs4_replay *rp = op->replay; 2451 2452 BUG_ON(!rp); 2453 2454 RESERVE_SPACE(8); 2455 WRITE32(op->opnum); 2456 *p++ = rp->rp_status; /* already xdr'ed */ 2457 ADJUST_ARGS(); 2458 2459 RESERVE_SPACE(rp->rp_buflen); 2460 WRITEMEM(rp->rp_buf, rp->rp_buflen); 2461 ADJUST_ARGS(); 2462 } 2463 2464 /* 2465 * END OF "GENERIC" ENCODE ROUTINES. 2466 */ 2467 2468 int 2469 nfs4svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy) 2470 { 2471 return xdr_ressize_check(rqstp, p); 2472 } 2473 2474 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args) 2475 { 2476 if (args->ops != args->iops) { 2477 kfree(args->ops); 2478 args->ops = args->iops; 2479 } 2480 if (args->tmpp) { 2481 kfree(args->tmpp); 2482 args->tmpp = NULL; 2483 } 2484 while (args->to_free) { 2485 struct tmpbuf *tb = args->to_free; 2486 args->to_free = tb->next; 2487 tb->release(tb->buf); 2488 kfree(tb); 2489 } 2490 } 2491 2492 int 2493 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundargs *args) 2494 { 2495 int status; 2496 2497 args->p = p; 2498 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len; 2499 args->pagelist = rqstp->rq_arg.pages; 2500 args->pagelen = rqstp->rq_arg.page_len; 2501 args->tmpp = NULL; 2502 args->to_free = NULL; 2503 args->ops = args->iops; 2504 args->rqstp = rqstp; 2505 2506 status = nfsd4_decode_compound(args); 2507 if (status) { 2508 nfsd4_release_compoundargs(args); 2509 } 2510 return !status; 2511 } 2512 2513 int 2514 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundres *resp) 2515 { 2516 /* 2517 * All that remains is to write the tag and operation count... 2518 */ 2519 struct kvec *iov; 2520 p = resp->tagp; 2521 *p++ = htonl(resp->taglen); 2522 memcpy(p, resp->tag, resp->taglen); 2523 p += XDR_QUADLEN(resp->taglen); 2524 *p++ = htonl(resp->opcnt); 2525 2526 if (rqstp->rq_res.page_len) 2527 iov = &rqstp->rq_res.tail[0]; 2528 else 2529 iov = &rqstp->rq_res.head[0]; 2530 iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base; 2531 BUG_ON(iov->iov_len > PAGE_SIZE); 2532 return 1; 2533 } 2534 2535 /* 2536 * Local variables: 2537 * c-basic-offset: 8 2538 * End: 2539 */ 2540