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