1 /* 2 * XDR support for nfsd/protocol version 3. 3 * 4 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> 5 * 6 * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()! 7 */ 8 9 #include <linux/namei.h> 10 #include <linux/sunrpc/svc_xprt.h> 11 #include "xdr3.h" 12 #include "auth.h" 13 #include "netns.h" 14 #include "vfs.h" 15 16 #define NFSDDBG_FACILITY NFSDDBG_XDR 17 18 19 /* 20 * Mapping of S_IF* types to NFS file types 21 */ 22 static u32 nfs3_ftypes[] = { 23 NF3NON, NF3FIFO, NF3CHR, NF3BAD, 24 NF3DIR, NF3BAD, NF3BLK, NF3BAD, 25 NF3REG, NF3BAD, NF3LNK, NF3BAD, 26 NF3SOCK, NF3BAD, NF3LNK, NF3BAD, 27 }; 28 29 /* 30 * XDR functions for basic NFS types 31 */ 32 static __be32 * 33 encode_time3(__be32 *p, struct timespec *time) 34 { 35 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec); 36 return p; 37 } 38 39 static __be32 * 40 decode_time3(__be32 *p, struct timespec *time) 41 { 42 time->tv_sec = ntohl(*p++); 43 time->tv_nsec = ntohl(*p++); 44 return p; 45 } 46 47 static __be32 * 48 decode_fh(__be32 *p, struct svc_fh *fhp) 49 { 50 unsigned int size; 51 fh_init(fhp, NFS3_FHSIZE); 52 size = ntohl(*p++); 53 if (size > NFS3_FHSIZE) 54 return NULL; 55 56 memcpy(&fhp->fh_handle.fh_base, p, size); 57 fhp->fh_handle.fh_size = size; 58 return p + XDR_QUADLEN(size); 59 } 60 61 /* Helper function for NFSv3 ACL code */ 62 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp) 63 { 64 return decode_fh(p, fhp); 65 } 66 67 static __be32 * 68 encode_fh(__be32 *p, struct svc_fh *fhp) 69 { 70 unsigned int size = fhp->fh_handle.fh_size; 71 *p++ = htonl(size); 72 if (size) p[XDR_QUADLEN(size)-1]=0; 73 memcpy(p, &fhp->fh_handle.fh_base, size); 74 return p + XDR_QUADLEN(size); 75 } 76 77 /* 78 * Decode a file name and make sure that the path contains 79 * no slashes or null bytes. 80 */ 81 static __be32 * 82 decode_filename(__be32 *p, char **namp, unsigned int *lenp) 83 { 84 char *name; 85 unsigned int i; 86 87 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) { 88 for (i = 0, name = *namp; i < *lenp; i++, name++) { 89 if (*name == '\0' || *name == '/') 90 return NULL; 91 } 92 } 93 94 return p; 95 } 96 97 static __be32 * 98 decode_sattr3(__be32 *p, struct iattr *iap) 99 { 100 u32 tmp; 101 102 iap->ia_valid = 0; 103 104 if (*p++) { 105 iap->ia_valid |= ATTR_MODE; 106 iap->ia_mode = ntohl(*p++); 107 } 108 if (*p++) { 109 iap->ia_uid = make_kuid(&init_user_ns, ntohl(*p++)); 110 if (uid_valid(iap->ia_uid)) 111 iap->ia_valid |= ATTR_UID; 112 } 113 if (*p++) { 114 iap->ia_gid = make_kgid(&init_user_ns, ntohl(*p++)); 115 if (gid_valid(iap->ia_gid)) 116 iap->ia_valid |= ATTR_GID; 117 } 118 if (*p++) { 119 u64 newsize; 120 121 iap->ia_valid |= ATTR_SIZE; 122 p = xdr_decode_hyper(p, &newsize); 123 iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX); 124 } 125 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ 126 iap->ia_valid |= ATTR_ATIME; 127 } else if (tmp == 2) { /* set to client time */ 128 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; 129 iap->ia_atime.tv_sec = ntohl(*p++); 130 iap->ia_atime.tv_nsec = ntohl(*p++); 131 } 132 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ 133 iap->ia_valid |= ATTR_MTIME; 134 } else if (tmp == 2) { /* set to client time */ 135 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; 136 iap->ia_mtime.tv_sec = ntohl(*p++); 137 iap->ia_mtime.tv_nsec = ntohl(*p++); 138 } 139 return p; 140 } 141 142 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp) 143 { 144 u64 f; 145 switch(fsid_source(fhp)) { 146 default: 147 case FSIDSOURCE_DEV: 148 p = xdr_encode_hyper(p, (u64)huge_encode_dev 149 (fhp->fh_dentry->d_sb->s_dev)); 150 break; 151 case FSIDSOURCE_FSID: 152 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); 153 break; 154 case FSIDSOURCE_UUID: 155 f = ((u64*)fhp->fh_export->ex_uuid)[0]; 156 f ^= ((u64*)fhp->fh_export->ex_uuid)[1]; 157 p = xdr_encode_hyper(p, f); 158 break; 159 } 160 return p; 161 } 162 163 static __be32 * 164 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, 165 struct kstat *stat) 166 { 167 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]); 168 *p++ = htonl((u32) (stat->mode & S_IALLUGO)); 169 *p++ = htonl((u32) stat->nlink); 170 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid)); 171 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid)); 172 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) { 173 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); 174 } else { 175 p = xdr_encode_hyper(p, (u64) stat->size); 176 } 177 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9); 178 *p++ = htonl((u32) MAJOR(stat->rdev)); 179 *p++ = htonl((u32) MINOR(stat->rdev)); 180 p = encode_fsid(p, fhp); 181 p = xdr_encode_hyper(p, stat->ino); 182 p = encode_time3(p, &stat->atime); 183 p = encode_time3(p, &stat->mtime); 184 p = encode_time3(p, &stat->ctime); 185 186 return p; 187 } 188 189 static __be32 * 190 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 191 { 192 /* Attributes to follow */ 193 *p++ = xdr_one; 194 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr); 195 } 196 197 /* 198 * Encode post-operation attributes. 199 * The inode may be NULL if the call failed because of a stale file 200 * handle. In this case, no attributes are returned. 201 */ 202 static __be32 * 203 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 204 { 205 struct dentry *dentry = fhp->fh_dentry; 206 if (dentry && d_really_is_positive(dentry)) { 207 __be32 err; 208 struct kstat stat; 209 210 err = fh_getattr(fhp, &stat); 211 if (!err) { 212 *p++ = xdr_one; /* attributes follow */ 213 lease_get_mtime(d_inode(dentry), &stat.mtime); 214 return encode_fattr3(rqstp, p, fhp, &stat); 215 } 216 } 217 *p++ = xdr_zero; 218 return p; 219 } 220 221 /* Helper for NFSv3 ACLs */ 222 __be32 * 223 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 224 { 225 return encode_post_op_attr(rqstp, p, fhp); 226 } 227 228 /* 229 * Enocde weak cache consistency data 230 */ 231 static __be32 * 232 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 233 { 234 struct dentry *dentry = fhp->fh_dentry; 235 236 if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) { 237 if (fhp->fh_pre_saved) { 238 *p++ = xdr_one; 239 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size); 240 p = encode_time3(p, &fhp->fh_pre_mtime); 241 p = encode_time3(p, &fhp->fh_pre_ctime); 242 } else { 243 *p++ = xdr_zero; 244 } 245 return encode_saved_post_attr(rqstp, p, fhp); 246 } 247 /* no pre- or post-attrs */ 248 *p++ = xdr_zero; 249 return encode_post_op_attr(rqstp, p, fhp); 250 } 251 252 /* 253 * Fill in the post_op attr for the wcc data 254 */ 255 void fill_post_wcc(struct svc_fh *fhp) 256 { 257 __be32 err; 258 259 if (fhp->fh_post_saved) 260 printk("nfsd: inode locked twice during operation.\n"); 261 262 err = fh_getattr(fhp, &fhp->fh_post_attr); 263 fhp->fh_post_change = d_inode(fhp->fh_dentry)->i_version; 264 if (err) { 265 fhp->fh_post_saved = false; 266 /* Grab the ctime anyway - set_change_info might use it */ 267 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime; 268 } else 269 fhp->fh_post_saved = true; 270 } 271 272 /* 273 * XDR decode functions 274 */ 275 int 276 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args) 277 { 278 p = decode_fh(p, &args->fh); 279 if (!p) 280 return 0; 281 return xdr_argsize_check(rqstp, p); 282 } 283 284 int 285 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p, 286 struct nfsd3_sattrargs *args) 287 { 288 p = decode_fh(p, &args->fh); 289 if (!p) 290 return 0; 291 p = decode_sattr3(p, &args->attrs); 292 293 if ((args->check_guard = ntohl(*p++)) != 0) { 294 struct timespec time; 295 p = decode_time3(p, &time); 296 args->guardtime = time.tv_sec; 297 } 298 299 return xdr_argsize_check(rqstp, p); 300 } 301 302 int 303 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p, 304 struct nfsd3_diropargs *args) 305 { 306 if (!(p = decode_fh(p, &args->fh)) 307 || !(p = decode_filename(p, &args->name, &args->len))) 308 return 0; 309 310 return xdr_argsize_check(rqstp, p); 311 } 312 313 int 314 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p, 315 struct nfsd3_accessargs *args) 316 { 317 p = decode_fh(p, &args->fh); 318 if (!p) 319 return 0; 320 args->access = ntohl(*p++); 321 322 return xdr_argsize_check(rqstp, p); 323 } 324 325 int 326 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p, 327 struct nfsd3_readargs *args) 328 { 329 unsigned int len; 330 int v; 331 u32 max_blocksize = svc_max_payload(rqstp); 332 333 p = decode_fh(p, &args->fh); 334 if (!p) 335 return 0; 336 p = xdr_decode_hyper(p, &args->offset); 337 args->count = ntohl(*p++); 338 339 if (!xdr_argsize_check(rqstp, p)) 340 return 0; 341 342 len = min(args->count, max_blocksize); 343 344 /* set up the kvec */ 345 v=0; 346 while (len > 0) { 347 struct page *p = *(rqstp->rq_next_page++); 348 349 rqstp->rq_vec[v].iov_base = page_address(p); 350 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE); 351 len -= rqstp->rq_vec[v].iov_len; 352 v++; 353 } 354 args->vlen = v; 355 return 1; 356 } 357 358 int 359 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p, 360 struct nfsd3_writeargs *args) 361 { 362 unsigned int len, v, hdr, dlen; 363 u32 max_blocksize = svc_max_payload(rqstp); 364 struct kvec *head = rqstp->rq_arg.head; 365 struct kvec *tail = rqstp->rq_arg.tail; 366 367 p = decode_fh(p, &args->fh); 368 if (!p) 369 return 0; 370 p = xdr_decode_hyper(p, &args->offset); 371 372 args->count = ntohl(*p++); 373 args->stable = ntohl(*p++); 374 len = args->len = ntohl(*p++); 375 if ((void *)p > head->iov_base + head->iov_len) 376 return 0; 377 /* 378 * The count must equal the amount of data passed. 379 */ 380 if (args->count != args->len) 381 return 0; 382 383 /* 384 * Check to make sure that we got the right number of 385 * bytes. 386 */ 387 hdr = (void*)p - head->iov_base; 388 dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr; 389 /* 390 * Round the length of the data which was specified up to 391 * the next multiple of XDR units and then compare that 392 * against the length which was actually received. 393 * Note that when RPCSEC/GSS (for example) is used, the 394 * data buffer can be padded so dlen might be larger 395 * than required. It must never be smaller. 396 */ 397 if (dlen < XDR_QUADLEN(len)*4) 398 return 0; 399 400 if (args->count > max_blocksize) { 401 args->count = max_blocksize; 402 len = args->len = max_blocksize; 403 } 404 rqstp->rq_vec[0].iov_base = (void*)p; 405 rqstp->rq_vec[0].iov_len = head->iov_len - hdr; 406 v = 0; 407 while (len > rqstp->rq_vec[v].iov_len) { 408 len -= rqstp->rq_vec[v].iov_len; 409 v++; 410 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]); 411 rqstp->rq_vec[v].iov_len = PAGE_SIZE; 412 } 413 rqstp->rq_vec[v].iov_len = len; 414 args->vlen = v + 1; 415 return 1; 416 } 417 418 int 419 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p, 420 struct nfsd3_createargs *args) 421 { 422 if (!(p = decode_fh(p, &args->fh)) 423 || !(p = decode_filename(p, &args->name, &args->len))) 424 return 0; 425 426 switch (args->createmode = ntohl(*p++)) { 427 case NFS3_CREATE_UNCHECKED: 428 case NFS3_CREATE_GUARDED: 429 p = decode_sattr3(p, &args->attrs); 430 break; 431 case NFS3_CREATE_EXCLUSIVE: 432 args->verf = p; 433 p += 2; 434 break; 435 default: 436 return 0; 437 } 438 439 return xdr_argsize_check(rqstp, p); 440 } 441 int 442 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p, 443 struct nfsd3_createargs *args) 444 { 445 if (!(p = decode_fh(p, &args->fh)) || 446 !(p = decode_filename(p, &args->name, &args->len))) 447 return 0; 448 p = decode_sattr3(p, &args->attrs); 449 450 return xdr_argsize_check(rqstp, p); 451 } 452 453 int 454 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p, 455 struct nfsd3_symlinkargs *args) 456 { 457 unsigned int len, avail; 458 char *old, *new; 459 struct kvec *vec; 460 461 if (!(p = decode_fh(p, &args->ffh)) || 462 !(p = decode_filename(p, &args->fname, &args->flen)) 463 ) 464 return 0; 465 p = decode_sattr3(p, &args->attrs); 466 467 /* now decode the pathname, which might be larger than the first page. 468 * As we have to check for nul's anyway, we copy it into a new page 469 * This page appears in the rq_res.pages list, but as pages_len is always 470 * 0, it won't get in the way 471 */ 472 len = ntohl(*p++); 473 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE) 474 return 0; 475 args->tname = new = page_address(*(rqstp->rq_next_page++)); 476 args->tlen = len; 477 /* first copy and check from the first page */ 478 old = (char*)p; 479 vec = &rqstp->rq_arg.head[0]; 480 if ((void *)old > vec->iov_base + vec->iov_len) 481 return 0; 482 avail = vec->iov_len - (old - (char*)vec->iov_base); 483 while (len && avail && *old) { 484 *new++ = *old++; 485 len--; 486 avail--; 487 } 488 /* now copy next page if there is one */ 489 if (len && !avail && rqstp->rq_arg.page_len) { 490 avail = min_t(unsigned int, rqstp->rq_arg.page_len, PAGE_SIZE); 491 old = page_address(rqstp->rq_arg.pages[0]); 492 } 493 while (len && avail && *old) { 494 *new++ = *old++; 495 len--; 496 avail--; 497 } 498 *new = '\0'; 499 if (len) 500 return 0; 501 502 return 1; 503 } 504 505 int 506 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p, 507 struct nfsd3_mknodargs *args) 508 { 509 if (!(p = decode_fh(p, &args->fh)) 510 || !(p = decode_filename(p, &args->name, &args->len))) 511 return 0; 512 513 args->ftype = ntohl(*p++); 514 515 if (args->ftype == NF3BLK || args->ftype == NF3CHR 516 || args->ftype == NF3SOCK || args->ftype == NF3FIFO) 517 p = decode_sattr3(p, &args->attrs); 518 519 if (args->ftype == NF3BLK || args->ftype == NF3CHR) { 520 args->major = ntohl(*p++); 521 args->minor = ntohl(*p++); 522 } 523 524 return xdr_argsize_check(rqstp, p); 525 } 526 527 int 528 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p, 529 struct nfsd3_renameargs *args) 530 { 531 if (!(p = decode_fh(p, &args->ffh)) 532 || !(p = decode_filename(p, &args->fname, &args->flen)) 533 || !(p = decode_fh(p, &args->tfh)) 534 || !(p = decode_filename(p, &args->tname, &args->tlen))) 535 return 0; 536 537 return xdr_argsize_check(rqstp, p); 538 } 539 540 int 541 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, 542 struct nfsd3_readlinkargs *args) 543 { 544 p = decode_fh(p, &args->fh); 545 if (!p) 546 return 0; 547 if (!xdr_argsize_check(rqstp, p)) 548 return 0; 549 args->buffer = page_address(*(rqstp->rq_next_page++)); 550 551 return 1; 552 } 553 554 int 555 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p, 556 struct nfsd3_linkargs *args) 557 { 558 if (!(p = decode_fh(p, &args->ffh)) 559 || !(p = decode_fh(p, &args->tfh)) 560 || !(p = decode_filename(p, &args->tname, &args->tlen))) 561 return 0; 562 563 return xdr_argsize_check(rqstp, p); 564 } 565 566 int 567 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p, 568 struct nfsd3_readdirargs *args) 569 { 570 p = decode_fh(p, &args->fh); 571 if (!p) 572 return 0; 573 p = xdr_decode_hyper(p, &args->cookie); 574 args->verf = p; p += 2; 575 args->dircount = ~0; 576 args->count = ntohl(*p++); 577 578 if (!xdr_argsize_check(rqstp, p)) 579 return 0; 580 581 args->count = min_t(u32, args->count, PAGE_SIZE); 582 args->buffer = page_address(*(rqstp->rq_next_page++)); 583 584 return 1; 585 } 586 587 int 588 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p, 589 struct nfsd3_readdirargs *args) 590 { 591 int len; 592 u32 max_blocksize = svc_max_payload(rqstp); 593 594 p = decode_fh(p, &args->fh); 595 if (!p) 596 return 0; 597 p = xdr_decode_hyper(p, &args->cookie); 598 args->verf = p; p += 2; 599 args->dircount = ntohl(*p++); 600 args->count = ntohl(*p++); 601 602 if (!xdr_argsize_check(rqstp, p)) 603 return 0; 604 605 len = args->count = min(args->count, max_blocksize); 606 while (len > 0) { 607 struct page *p = *(rqstp->rq_next_page++); 608 if (!args->buffer) 609 args->buffer = page_address(p); 610 len -= PAGE_SIZE; 611 } 612 return 1; 613 } 614 615 int 616 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p, 617 struct nfsd3_commitargs *args) 618 { 619 p = decode_fh(p, &args->fh); 620 if (!p) 621 return 0; 622 p = xdr_decode_hyper(p, &args->offset); 623 args->count = ntohl(*p++); 624 625 return xdr_argsize_check(rqstp, p); 626 } 627 628 /* 629 * XDR encode functions 630 */ 631 /* 632 * There must be an encoding function for void results so svc_process 633 * will work properly. 634 */ 635 int 636 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy) 637 { 638 return xdr_ressize_check(rqstp, p); 639 } 640 641 /* GETATTR */ 642 int 643 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p, 644 struct nfsd3_attrstat *resp) 645 { 646 if (resp->status == 0) { 647 lease_get_mtime(d_inode(resp->fh.fh_dentry), 648 &resp->stat.mtime); 649 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat); 650 } 651 return xdr_ressize_check(rqstp, p); 652 } 653 654 /* SETATTR, REMOVE, RMDIR */ 655 int 656 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p, 657 struct nfsd3_attrstat *resp) 658 { 659 p = encode_wcc_data(rqstp, p, &resp->fh); 660 return xdr_ressize_check(rqstp, p); 661 } 662 663 /* LOOKUP */ 664 int 665 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p, 666 struct nfsd3_diropres *resp) 667 { 668 if (resp->status == 0) { 669 p = encode_fh(p, &resp->fh); 670 p = encode_post_op_attr(rqstp, p, &resp->fh); 671 } 672 p = encode_post_op_attr(rqstp, p, &resp->dirfh); 673 return xdr_ressize_check(rqstp, p); 674 } 675 676 /* ACCESS */ 677 int 678 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p, 679 struct nfsd3_accessres *resp) 680 { 681 p = encode_post_op_attr(rqstp, p, &resp->fh); 682 if (resp->status == 0) 683 *p++ = htonl(resp->access); 684 return xdr_ressize_check(rqstp, p); 685 } 686 687 /* READLINK */ 688 int 689 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p, 690 struct nfsd3_readlinkres *resp) 691 { 692 p = encode_post_op_attr(rqstp, p, &resp->fh); 693 if (resp->status == 0) { 694 *p++ = htonl(resp->len); 695 xdr_ressize_check(rqstp, p); 696 rqstp->rq_res.page_len = resp->len; 697 if (resp->len & 3) { 698 /* need to pad the tail */ 699 rqstp->rq_res.tail[0].iov_base = p; 700 *p = 0; 701 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3); 702 } 703 return 1; 704 } else 705 return xdr_ressize_check(rqstp, p); 706 } 707 708 /* READ */ 709 int 710 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p, 711 struct nfsd3_readres *resp) 712 { 713 p = encode_post_op_attr(rqstp, p, &resp->fh); 714 if (resp->status == 0) { 715 *p++ = htonl(resp->count); 716 *p++ = htonl(resp->eof); 717 *p++ = htonl(resp->count); /* xdr opaque count */ 718 xdr_ressize_check(rqstp, p); 719 /* now update rqstp->rq_res to reflect data as well */ 720 rqstp->rq_res.page_len = resp->count; 721 if (resp->count & 3) { 722 /* need to pad the tail */ 723 rqstp->rq_res.tail[0].iov_base = p; 724 *p = 0; 725 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3); 726 } 727 return 1; 728 } else 729 return xdr_ressize_check(rqstp, p); 730 } 731 732 /* WRITE */ 733 int 734 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p, 735 struct nfsd3_writeres *resp) 736 { 737 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 738 739 p = encode_wcc_data(rqstp, p, &resp->fh); 740 if (resp->status == 0) { 741 *p++ = htonl(resp->count); 742 *p++ = htonl(resp->committed); 743 *p++ = htonl(nn->nfssvc_boot.tv_sec); 744 *p++ = htonl(nn->nfssvc_boot.tv_usec); 745 } 746 return xdr_ressize_check(rqstp, p); 747 } 748 749 /* CREATE, MKDIR, SYMLINK, MKNOD */ 750 int 751 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p, 752 struct nfsd3_diropres *resp) 753 { 754 if (resp->status == 0) { 755 *p++ = xdr_one; 756 p = encode_fh(p, &resp->fh); 757 p = encode_post_op_attr(rqstp, p, &resp->fh); 758 } 759 p = encode_wcc_data(rqstp, p, &resp->dirfh); 760 return xdr_ressize_check(rqstp, p); 761 } 762 763 /* RENAME */ 764 int 765 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p, 766 struct nfsd3_renameres *resp) 767 { 768 p = encode_wcc_data(rqstp, p, &resp->ffh); 769 p = encode_wcc_data(rqstp, p, &resp->tfh); 770 return xdr_ressize_check(rqstp, p); 771 } 772 773 /* LINK */ 774 int 775 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p, 776 struct nfsd3_linkres *resp) 777 { 778 p = encode_post_op_attr(rqstp, p, &resp->fh); 779 p = encode_wcc_data(rqstp, p, &resp->tfh); 780 return xdr_ressize_check(rqstp, p); 781 } 782 783 /* READDIR */ 784 int 785 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p, 786 struct nfsd3_readdirres *resp) 787 { 788 p = encode_post_op_attr(rqstp, p, &resp->fh); 789 790 if (resp->status == 0) { 791 /* stupid readdir cookie */ 792 memcpy(p, resp->verf, 8); p += 2; 793 xdr_ressize_check(rqstp, p); 794 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE) 795 return 1; /*No room for trailer */ 796 rqstp->rq_res.page_len = (resp->count) << 2; 797 798 /* add the 'tail' to the end of the 'head' page - page 0. */ 799 rqstp->rq_res.tail[0].iov_base = p; 800 *p++ = 0; /* no more entries */ 801 *p++ = htonl(resp->common.err == nfserr_eof); 802 rqstp->rq_res.tail[0].iov_len = 2<<2; 803 return 1; 804 } else 805 return xdr_ressize_check(rqstp, p); 806 } 807 808 static __be32 * 809 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, 810 int namlen, u64 ino) 811 { 812 *p++ = xdr_one; /* mark entry present */ 813 p = xdr_encode_hyper(p, ino); /* file id */ 814 p = xdr_encode_array(p, name, namlen);/* name length & name */ 815 816 cd->offset = p; /* remember pointer */ 817 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */ 818 819 return p; 820 } 821 822 static __be32 823 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, 824 const char *name, int namlen, u64 ino) 825 { 826 struct svc_export *exp; 827 struct dentry *dparent, *dchild; 828 __be32 rv = nfserr_noent; 829 830 dparent = cd->fh.fh_dentry; 831 exp = cd->fh.fh_export; 832 833 if (isdotent(name, namlen)) { 834 if (namlen == 2) { 835 dchild = dget_parent(dparent); 836 /* filesystem root - cannot return filehandle for ".." */ 837 if (dchild == dparent) 838 goto out; 839 } else 840 dchild = dget(dparent); 841 } else 842 dchild = lookup_one_len_unlocked(name, dparent, namlen); 843 if (IS_ERR(dchild)) 844 return rv; 845 if (d_mountpoint(dchild)) 846 goto out; 847 if (d_really_is_negative(dchild)) 848 goto out; 849 if (dchild->d_inode->i_ino != ino) 850 goto out; 851 rv = fh_compose(fhp, exp, dchild, &cd->fh); 852 out: 853 dput(dchild); 854 return rv; 855 } 856 857 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino) 858 { 859 struct svc_fh *fh = &cd->scratch; 860 __be32 err; 861 862 fh_init(fh, NFS3_FHSIZE); 863 err = compose_entry_fh(cd, fh, name, namlen, ino); 864 if (err) { 865 *p++ = 0; 866 *p++ = 0; 867 goto out; 868 } 869 p = encode_post_op_attr(cd->rqstp, p, fh); 870 *p++ = xdr_one; /* yes, a file handle follows */ 871 p = encode_fh(p, fh); 872 out: 873 fh_put(fh); 874 return p; 875 } 876 877 /* 878 * Encode a directory entry. This one works for both normal readdir 879 * and readdirplus. 880 * The normal readdir reply requires 2 (fileid) + 1 (stringlen) 881 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen. 882 * 883 * The readdirplus baggage is 1+21 words for post_op_attr, plus the 884 * file handle. 885 */ 886 887 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1) 888 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2)) 889 static int 890 encode_entry(struct readdir_cd *ccd, const char *name, int namlen, 891 loff_t offset, u64 ino, unsigned int d_type, int plus) 892 { 893 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres, 894 common); 895 __be32 *p = cd->buffer; 896 caddr_t curr_page_addr = NULL; 897 struct page ** page; 898 int slen; /* string (name) length */ 899 int elen; /* estimated entry length in words */ 900 int num_entry_words = 0; /* actual number of words */ 901 902 if (cd->offset) { 903 u64 offset64 = offset; 904 905 if (unlikely(cd->offset1)) { 906 /* we ended up with offset on a page boundary */ 907 *cd->offset = htonl(offset64 >> 32); 908 *cd->offset1 = htonl(offset64 & 0xffffffff); 909 cd->offset1 = NULL; 910 } else { 911 xdr_encode_hyper(cd->offset, offset64); 912 } 913 } 914 915 /* 916 dprintk("encode_entry(%.*s @%ld%s)\n", 917 namlen, name, (long) offset, plus? " plus" : ""); 918 */ 919 920 /* truncate filename if too long */ 921 namlen = min(namlen, NFS3_MAXNAMLEN); 922 923 slen = XDR_QUADLEN(namlen); 924 elen = slen + NFS3_ENTRY_BAGGAGE 925 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0); 926 927 if (cd->buflen < elen) { 928 cd->common.err = nfserr_toosmall; 929 return -EINVAL; 930 } 931 932 /* determine which page in rq_respages[] we are currently filling */ 933 for (page = cd->rqstp->rq_respages + 1; 934 page < cd->rqstp->rq_next_page; page++) { 935 curr_page_addr = page_address(*page); 936 937 if (((caddr_t)cd->buffer >= curr_page_addr) && 938 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE)) 939 break; 940 } 941 942 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) { 943 /* encode entry in current page */ 944 945 p = encode_entry_baggage(cd, p, name, namlen, ino); 946 947 if (plus) 948 p = encode_entryplus_baggage(cd, p, name, namlen, ino); 949 num_entry_words = p - cd->buffer; 950 } else if (*(page+1) != NULL) { 951 /* temporarily encode entry into next page, then move back to 952 * current and next page in rq_respages[] */ 953 __be32 *p1, *tmp; 954 int len1, len2; 955 956 /* grab next page for temporary storage of entry */ 957 p1 = tmp = page_address(*(page+1)); 958 959 p1 = encode_entry_baggage(cd, p1, name, namlen, ino); 960 961 if (plus) 962 p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino); 963 964 /* determine entry word length and lengths to go in pages */ 965 num_entry_words = p1 - tmp; 966 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer; 967 if ((num_entry_words << 2) < len1) { 968 /* the actual number of words in the entry is less 969 * than elen and can still fit in the current page 970 */ 971 memmove(p, tmp, num_entry_words << 2); 972 p += num_entry_words; 973 974 /* update offset */ 975 cd->offset = cd->buffer + (cd->offset - tmp); 976 } else { 977 unsigned int offset_r = (cd->offset - tmp) << 2; 978 979 /* update pointer to offset location. 980 * This is a 64bit quantity, so we need to 981 * deal with 3 cases: 982 * - entirely in first page 983 * - entirely in second page 984 * - 4 bytes in each page 985 */ 986 if (offset_r + 8 <= len1) { 987 cd->offset = p + (cd->offset - tmp); 988 } else if (offset_r >= len1) { 989 cd->offset -= len1 >> 2; 990 } else { 991 /* sitting on the fence */ 992 BUG_ON(offset_r != len1 - 4); 993 cd->offset = p + (cd->offset - tmp); 994 cd->offset1 = tmp; 995 } 996 997 len2 = (num_entry_words << 2) - len1; 998 999 /* move from temp page to current and next pages */ 1000 memmove(p, tmp, len1); 1001 memmove(tmp, (caddr_t)tmp+len1, len2); 1002 1003 p = tmp + (len2 >> 2); 1004 } 1005 } 1006 else { 1007 cd->common.err = nfserr_toosmall; 1008 return -EINVAL; 1009 } 1010 1011 cd->buflen -= num_entry_words; 1012 cd->buffer = p; 1013 cd->common.err = nfs_ok; 1014 return 0; 1015 1016 } 1017 1018 int 1019 nfs3svc_encode_entry(void *cd, const char *name, 1020 int namlen, loff_t offset, u64 ino, unsigned int d_type) 1021 { 1022 return encode_entry(cd, name, namlen, offset, ino, d_type, 0); 1023 } 1024 1025 int 1026 nfs3svc_encode_entry_plus(void *cd, const char *name, 1027 int namlen, loff_t offset, u64 ino, 1028 unsigned int d_type) 1029 { 1030 return encode_entry(cd, name, namlen, offset, ino, d_type, 1); 1031 } 1032 1033 /* FSSTAT */ 1034 int 1035 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p, 1036 struct nfsd3_fsstatres *resp) 1037 { 1038 struct kstatfs *s = &resp->stats; 1039 u64 bs = s->f_bsize; 1040 1041 *p++ = xdr_zero; /* no post_op_attr */ 1042 1043 if (resp->status == 0) { 1044 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */ 1045 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */ 1046 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */ 1047 p = xdr_encode_hyper(p, s->f_files); /* total inodes */ 1048 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */ 1049 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */ 1050 *p++ = htonl(resp->invarsec); /* mean unchanged time */ 1051 } 1052 return xdr_ressize_check(rqstp, p); 1053 } 1054 1055 /* FSINFO */ 1056 int 1057 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p, 1058 struct nfsd3_fsinfores *resp) 1059 { 1060 *p++ = xdr_zero; /* no post_op_attr */ 1061 1062 if (resp->status == 0) { 1063 *p++ = htonl(resp->f_rtmax); 1064 *p++ = htonl(resp->f_rtpref); 1065 *p++ = htonl(resp->f_rtmult); 1066 *p++ = htonl(resp->f_wtmax); 1067 *p++ = htonl(resp->f_wtpref); 1068 *p++ = htonl(resp->f_wtmult); 1069 *p++ = htonl(resp->f_dtpref); 1070 p = xdr_encode_hyper(p, resp->f_maxfilesize); 1071 *p++ = xdr_one; 1072 *p++ = xdr_zero; 1073 *p++ = htonl(resp->f_properties); 1074 } 1075 1076 return xdr_ressize_check(rqstp, p); 1077 } 1078 1079 /* PATHCONF */ 1080 int 1081 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p, 1082 struct nfsd3_pathconfres *resp) 1083 { 1084 *p++ = xdr_zero; /* no post_op_attr */ 1085 1086 if (resp->status == 0) { 1087 *p++ = htonl(resp->p_link_max); 1088 *p++ = htonl(resp->p_name_max); 1089 *p++ = htonl(resp->p_no_trunc); 1090 *p++ = htonl(resp->p_chown_restricted); 1091 *p++ = htonl(resp->p_case_insensitive); 1092 *p++ = htonl(resp->p_case_preserving); 1093 } 1094 1095 return xdr_ressize_check(rqstp, p); 1096 } 1097 1098 /* COMMIT */ 1099 int 1100 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p, 1101 struct nfsd3_commitres *resp) 1102 { 1103 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 1104 1105 p = encode_wcc_data(rqstp, p, &resp->fh); 1106 /* Write verifier */ 1107 if (resp->status == 0) { 1108 *p++ = htonl(nn->nfssvc_boot.tv_sec); 1109 *p++ = htonl(nn->nfssvc_boot.tv_usec); 1110 } 1111 return xdr_ressize_check(rqstp, p); 1112 } 1113 1114 /* 1115 * XDR release functions 1116 */ 1117 int 1118 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p, 1119 struct nfsd3_attrstat *resp) 1120 { 1121 fh_put(&resp->fh); 1122 return 1; 1123 } 1124 1125 int 1126 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p, 1127 struct nfsd3_fhandle_pair *resp) 1128 { 1129 fh_put(&resp->fh1); 1130 fh_put(&resp->fh2); 1131 return 1; 1132 } 1133