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 /* Grab the ctime anyway - set_change_info might use it */ 266 fhp->fh_post_attr.ctime = fhp->fh_dentry->d_inode->i_ctime; 267 } else 268 fhp->fh_post_saved = 1; 269 } 270 271 /* 272 * XDR decode functions 273 */ 274 int 275 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args) 276 { 277 if (!(p = decode_fh(p, &args->fh))) 278 return 0; 279 return xdr_argsize_check(rqstp, p); 280 } 281 282 int 283 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p, 284 struct nfsd3_sattrargs *args) 285 { 286 if (!(p = decode_fh(p, &args->fh))) 287 return 0; 288 p = decode_sattr3(p, &args->attrs); 289 290 if ((args->check_guard = ntohl(*p++)) != 0) { 291 struct timespec time; 292 p = decode_time3(p, &time); 293 args->guardtime = time.tv_sec; 294 } 295 296 return xdr_argsize_check(rqstp, p); 297 } 298 299 int 300 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p, 301 struct nfsd3_diropargs *args) 302 { 303 if (!(p = decode_fh(p, &args->fh)) 304 || !(p = decode_filename(p, &args->name, &args->len))) 305 return 0; 306 307 return xdr_argsize_check(rqstp, p); 308 } 309 310 int 311 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p, 312 struct nfsd3_accessargs *args) 313 { 314 if (!(p = decode_fh(p, &args->fh))) 315 return 0; 316 args->access = ntohl(*p++); 317 318 return xdr_argsize_check(rqstp, p); 319 } 320 321 int 322 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p, 323 struct nfsd3_readargs *args) 324 { 325 unsigned int len; 326 int v,pn; 327 u32 max_blocksize = svc_max_payload(rqstp); 328 329 if (!(p = decode_fh(p, &args->fh))) 330 return 0; 331 p = xdr_decode_hyper(p, &args->offset); 332 333 len = args->count = ntohl(*p++); 334 335 if (len > max_blocksize) 336 len = max_blocksize; 337 338 /* set up the kvec */ 339 v=0; 340 while (len > 0) { 341 pn = rqstp->rq_resused++; 342 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]); 343 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE; 344 len -= rqstp->rq_vec[v].iov_len; 345 v++; 346 } 347 args->vlen = v; 348 return xdr_argsize_check(rqstp, p); 349 } 350 351 int 352 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p, 353 struct nfsd3_writeargs *args) 354 { 355 unsigned int len, v, hdr, dlen; 356 u32 max_blocksize = svc_max_payload(rqstp); 357 358 if (!(p = decode_fh(p, &args->fh))) 359 return 0; 360 p = xdr_decode_hyper(p, &args->offset); 361 362 args->count = ntohl(*p++); 363 args->stable = ntohl(*p++); 364 len = args->len = ntohl(*p++); 365 /* 366 * The count must equal the amount of data passed. 367 */ 368 if (args->count != args->len) 369 return 0; 370 371 /* 372 * Check to make sure that we got the right number of 373 * bytes. 374 */ 375 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base; 376 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len 377 - hdr; 378 /* 379 * Round the length of the data which was specified up to 380 * the next multiple of XDR units and then compare that 381 * against the length which was actually received. 382 * Note that when RPCSEC/GSS (for example) is used, the 383 * data buffer can be padded so dlen might be larger 384 * than required. It must never be smaller. 385 */ 386 if (dlen < XDR_QUADLEN(len)*4) 387 return 0; 388 389 if (args->count > max_blocksize) { 390 args->count = max_blocksize; 391 len = args->len = max_blocksize; 392 } 393 rqstp->rq_vec[0].iov_base = (void*)p; 394 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr; 395 v = 0; 396 while (len > rqstp->rq_vec[v].iov_len) { 397 len -= rqstp->rq_vec[v].iov_len; 398 v++; 399 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]); 400 rqstp->rq_vec[v].iov_len = PAGE_SIZE; 401 } 402 rqstp->rq_vec[v].iov_len = len; 403 args->vlen = v + 1; 404 return 1; 405 } 406 407 int 408 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p, 409 struct nfsd3_createargs *args) 410 { 411 if (!(p = decode_fh(p, &args->fh)) 412 || !(p = decode_filename(p, &args->name, &args->len))) 413 return 0; 414 415 switch (args->createmode = ntohl(*p++)) { 416 case NFS3_CREATE_UNCHECKED: 417 case NFS3_CREATE_GUARDED: 418 p = decode_sattr3(p, &args->attrs); 419 break; 420 case NFS3_CREATE_EXCLUSIVE: 421 args->verf = p; 422 p += 2; 423 break; 424 default: 425 return 0; 426 } 427 428 return xdr_argsize_check(rqstp, p); 429 } 430 int 431 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p, 432 struct nfsd3_createargs *args) 433 { 434 if (!(p = decode_fh(p, &args->fh)) || 435 !(p = decode_filename(p, &args->name, &args->len))) 436 return 0; 437 p = decode_sattr3(p, &args->attrs); 438 439 return xdr_argsize_check(rqstp, p); 440 } 441 442 int 443 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p, 444 struct nfsd3_symlinkargs *args) 445 { 446 unsigned int len, avail; 447 char *old, *new; 448 struct kvec *vec; 449 450 if (!(p = decode_fh(p, &args->ffh)) || 451 !(p = decode_filename(p, &args->fname, &args->flen)) 452 ) 453 return 0; 454 p = decode_sattr3(p, &args->attrs); 455 456 /* now decode the pathname, which might be larger than the first page. 457 * As we have to check for nul's anyway, we copy it into a new page 458 * This page appears in the rq_res.pages list, but as pages_len is always 459 * 0, it won't get in the way 460 */ 461 len = ntohl(*p++); 462 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE) 463 return 0; 464 args->tname = new = 465 page_address(rqstp->rq_respages[rqstp->rq_resused++]); 466 args->tlen = len; 467 /* first copy and check from the first page */ 468 old = (char*)p; 469 vec = &rqstp->rq_arg.head[0]; 470 avail = vec->iov_len - (old - (char*)vec->iov_base); 471 while (len && avail && *old) { 472 *new++ = *old++; 473 len--; 474 avail--; 475 } 476 /* now copy next page if there is one */ 477 if (len && !avail && rqstp->rq_arg.page_len) { 478 avail = rqstp->rq_arg.page_len; 479 if (avail > PAGE_SIZE) 480 avail = PAGE_SIZE; 481 old = page_address(rqstp->rq_arg.pages[0]); 482 } 483 while (len && avail && *old) { 484 *new++ = *old++; 485 len--; 486 avail--; 487 } 488 *new = '\0'; 489 if (len) 490 return 0; 491 492 return 1; 493 } 494 495 int 496 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p, 497 struct nfsd3_mknodargs *args) 498 { 499 if (!(p = decode_fh(p, &args->fh)) 500 || !(p = decode_filename(p, &args->name, &args->len))) 501 return 0; 502 503 args->ftype = ntohl(*p++); 504 505 if (args->ftype == NF3BLK || args->ftype == NF3CHR 506 || args->ftype == NF3SOCK || args->ftype == NF3FIFO) 507 p = decode_sattr3(p, &args->attrs); 508 509 if (args->ftype == NF3BLK || args->ftype == NF3CHR) { 510 args->major = ntohl(*p++); 511 args->minor = ntohl(*p++); 512 } 513 514 return xdr_argsize_check(rqstp, p); 515 } 516 517 int 518 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p, 519 struct nfsd3_renameargs *args) 520 { 521 if (!(p = decode_fh(p, &args->ffh)) 522 || !(p = decode_filename(p, &args->fname, &args->flen)) 523 || !(p = decode_fh(p, &args->tfh)) 524 || !(p = decode_filename(p, &args->tname, &args->tlen))) 525 return 0; 526 527 return xdr_argsize_check(rqstp, p); 528 } 529 530 int 531 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, 532 struct nfsd3_readlinkargs *args) 533 { 534 if (!(p = decode_fh(p, &args->fh))) 535 return 0; 536 args->buffer = 537 page_address(rqstp->rq_respages[rqstp->rq_resused++]); 538 539 return xdr_argsize_check(rqstp, p); 540 } 541 542 int 543 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p, 544 struct nfsd3_linkargs *args) 545 { 546 if (!(p = decode_fh(p, &args->ffh)) 547 || !(p = decode_fh(p, &args->tfh)) 548 || !(p = decode_filename(p, &args->tname, &args->tlen))) 549 return 0; 550 551 return xdr_argsize_check(rqstp, p); 552 } 553 554 int 555 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p, 556 struct nfsd3_readdirargs *args) 557 { 558 if (!(p = decode_fh(p, &args->fh))) 559 return 0; 560 p = xdr_decode_hyper(p, &args->cookie); 561 args->verf = p; p += 2; 562 args->dircount = ~0; 563 args->count = ntohl(*p++); 564 565 if (args->count > PAGE_SIZE) 566 args->count = PAGE_SIZE; 567 568 args->buffer = 569 page_address(rqstp->rq_respages[rqstp->rq_resused++]); 570 571 return xdr_argsize_check(rqstp, p); 572 } 573 574 int 575 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p, 576 struct nfsd3_readdirargs *args) 577 { 578 int len, pn; 579 u32 max_blocksize = svc_max_payload(rqstp); 580 581 if (!(p = decode_fh(p, &args->fh))) 582 return 0; 583 p = xdr_decode_hyper(p, &args->cookie); 584 args->verf = p; p += 2; 585 args->dircount = ntohl(*p++); 586 args->count = ntohl(*p++); 587 588 len = (args->count > max_blocksize) ? max_blocksize : 589 args->count; 590 args->count = len; 591 592 while (len > 0) { 593 pn = rqstp->rq_resused++; 594 if (!args->buffer) 595 args->buffer = page_address(rqstp->rq_respages[pn]); 596 len -= PAGE_SIZE; 597 } 598 599 return xdr_argsize_check(rqstp, p); 600 } 601 602 int 603 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p, 604 struct nfsd3_commitargs *args) 605 { 606 if (!(p = decode_fh(p, &args->fh))) 607 return 0; 608 p = xdr_decode_hyper(p, &args->offset); 609 args->count = ntohl(*p++); 610 611 return xdr_argsize_check(rqstp, p); 612 } 613 614 /* 615 * XDR encode functions 616 */ 617 /* 618 * There must be an encoding function for void results so svc_process 619 * will work properly. 620 */ 621 int 622 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy) 623 { 624 return xdr_ressize_check(rqstp, p); 625 } 626 627 /* GETATTR */ 628 int 629 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p, 630 struct nfsd3_attrstat *resp) 631 { 632 if (resp->status == 0) { 633 lease_get_mtime(resp->fh.fh_dentry->d_inode, 634 &resp->stat.mtime); 635 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat); 636 } 637 return xdr_ressize_check(rqstp, p); 638 } 639 640 /* SETATTR, REMOVE, RMDIR */ 641 int 642 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p, 643 struct nfsd3_attrstat *resp) 644 { 645 p = encode_wcc_data(rqstp, p, &resp->fh); 646 return xdr_ressize_check(rqstp, p); 647 } 648 649 /* LOOKUP */ 650 int 651 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p, 652 struct nfsd3_diropres *resp) 653 { 654 if (resp->status == 0) { 655 p = encode_fh(p, &resp->fh); 656 p = encode_post_op_attr(rqstp, p, &resp->fh); 657 } 658 p = encode_post_op_attr(rqstp, p, &resp->dirfh); 659 return xdr_ressize_check(rqstp, p); 660 } 661 662 /* ACCESS */ 663 int 664 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p, 665 struct nfsd3_accessres *resp) 666 { 667 p = encode_post_op_attr(rqstp, p, &resp->fh); 668 if (resp->status == 0) 669 *p++ = htonl(resp->access); 670 return xdr_ressize_check(rqstp, p); 671 } 672 673 /* READLINK */ 674 int 675 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p, 676 struct nfsd3_readlinkres *resp) 677 { 678 p = encode_post_op_attr(rqstp, p, &resp->fh); 679 if (resp->status == 0) { 680 *p++ = htonl(resp->len); 681 xdr_ressize_check(rqstp, p); 682 rqstp->rq_res.page_len = resp->len; 683 if (resp->len & 3) { 684 /* need to pad the tail */ 685 rqstp->rq_res.tail[0].iov_base = p; 686 *p = 0; 687 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3); 688 } 689 return 1; 690 } else 691 return xdr_ressize_check(rqstp, p); 692 } 693 694 /* READ */ 695 int 696 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p, 697 struct nfsd3_readres *resp) 698 { 699 p = encode_post_op_attr(rqstp, p, &resp->fh); 700 if (resp->status == 0) { 701 *p++ = htonl(resp->count); 702 *p++ = htonl(resp->eof); 703 *p++ = htonl(resp->count); /* xdr opaque count */ 704 xdr_ressize_check(rqstp, p); 705 /* now update rqstp->rq_res to reflect data as well */ 706 rqstp->rq_res.page_len = resp->count; 707 if (resp->count & 3) { 708 /* need to pad the tail */ 709 rqstp->rq_res.tail[0].iov_base = p; 710 *p = 0; 711 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3); 712 } 713 return 1; 714 } else 715 return xdr_ressize_check(rqstp, p); 716 } 717 718 /* WRITE */ 719 int 720 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p, 721 struct nfsd3_writeres *resp) 722 { 723 p = encode_wcc_data(rqstp, p, &resp->fh); 724 if (resp->status == 0) { 725 *p++ = htonl(resp->count); 726 *p++ = htonl(resp->committed); 727 *p++ = htonl(nfssvc_boot.tv_sec); 728 *p++ = htonl(nfssvc_boot.tv_usec); 729 } 730 return xdr_ressize_check(rqstp, p); 731 } 732 733 /* CREATE, MKDIR, SYMLINK, MKNOD */ 734 int 735 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p, 736 struct nfsd3_diropres *resp) 737 { 738 if (resp->status == 0) { 739 *p++ = xdr_one; 740 p = encode_fh(p, &resp->fh); 741 p = encode_post_op_attr(rqstp, p, &resp->fh); 742 } 743 p = encode_wcc_data(rqstp, p, &resp->dirfh); 744 return xdr_ressize_check(rqstp, p); 745 } 746 747 /* RENAME */ 748 int 749 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p, 750 struct nfsd3_renameres *resp) 751 { 752 p = encode_wcc_data(rqstp, p, &resp->ffh); 753 p = encode_wcc_data(rqstp, p, &resp->tfh); 754 return xdr_ressize_check(rqstp, p); 755 } 756 757 /* LINK */ 758 int 759 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p, 760 struct nfsd3_linkres *resp) 761 { 762 p = encode_post_op_attr(rqstp, p, &resp->fh); 763 p = encode_wcc_data(rqstp, p, &resp->tfh); 764 return xdr_ressize_check(rqstp, p); 765 } 766 767 /* READDIR */ 768 int 769 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p, 770 struct nfsd3_readdirres *resp) 771 { 772 p = encode_post_op_attr(rqstp, p, &resp->fh); 773 774 if (resp->status == 0) { 775 /* stupid readdir cookie */ 776 memcpy(p, resp->verf, 8); p += 2; 777 xdr_ressize_check(rqstp, p); 778 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE) 779 return 1; /*No room for trailer */ 780 rqstp->rq_res.page_len = (resp->count) << 2; 781 782 /* add the 'tail' to the end of the 'head' page - page 0. */ 783 rqstp->rq_res.tail[0].iov_base = p; 784 *p++ = 0; /* no more entries */ 785 *p++ = htonl(resp->common.err == nfserr_eof); 786 rqstp->rq_res.tail[0].iov_len = 2<<2; 787 return 1; 788 } else 789 return xdr_ressize_check(rqstp, p); 790 } 791 792 static __be32 * 793 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, 794 int namlen, u64 ino) 795 { 796 *p++ = xdr_one; /* mark entry present */ 797 p = xdr_encode_hyper(p, ino); /* file id */ 798 p = xdr_encode_array(p, name, namlen);/* name length & name */ 799 800 cd->offset = p; /* remember pointer */ 801 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */ 802 803 return p; 804 } 805 806 static __be32 807 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, 808 const char *name, int namlen) 809 { 810 struct svc_export *exp; 811 struct dentry *dparent, *dchild; 812 __be32 rv = nfserr_noent; 813 814 dparent = cd->fh.fh_dentry; 815 exp = cd->fh.fh_export; 816 817 if (isdotent(name, namlen)) { 818 if (namlen == 2) { 819 dchild = dget_parent(dparent); 820 /* filesystem root - cannot return filehandle for ".." */ 821 if (dchild == dparent) 822 goto out; 823 } else 824 dchild = dget(dparent); 825 } else 826 dchild = lookup_one_len(name, dparent, namlen); 827 if (IS_ERR(dchild)) 828 return rv; 829 if (d_mountpoint(dchild)) 830 goto out; 831 if (!dchild->d_inode) 832 goto out; 833 rv = fh_compose(fhp, exp, dchild, &cd->fh); 834 out: 835 dput(dchild); 836 return rv; 837 } 838 839 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen) 840 { 841 struct svc_fh fh; 842 __be32 err; 843 844 fh_init(&fh, NFS3_FHSIZE); 845 err = compose_entry_fh(cd, &fh, name, namlen); 846 if (err) { 847 *p++ = 0; 848 *p++ = 0; 849 goto out; 850 } 851 p = encode_post_op_attr(cd->rqstp, p, &fh); 852 *p++ = xdr_one; /* yes, a file handle follows */ 853 p = encode_fh(p, &fh); 854 out: 855 fh_put(&fh); 856 return p; 857 } 858 859 /* 860 * Encode a directory entry. This one works for both normal readdir 861 * and readdirplus. 862 * The normal readdir reply requires 2 (fileid) + 1 (stringlen) 863 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen. 864 * 865 * The readdirplus baggage is 1+21 words for post_op_attr, plus the 866 * file handle. 867 */ 868 869 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1) 870 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2)) 871 static int 872 encode_entry(struct readdir_cd *ccd, const char *name, int namlen, 873 loff_t offset, u64 ino, unsigned int d_type, int plus) 874 { 875 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres, 876 common); 877 __be32 *p = cd->buffer; 878 caddr_t curr_page_addr = NULL; 879 int pn; /* current page number */ 880 int slen; /* string (name) length */ 881 int elen; /* estimated entry length in words */ 882 int num_entry_words = 0; /* actual number of words */ 883 884 if (cd->offset) { 885 u64 offset64 = offset; 886 887 if (unlikely(cd->offset1)) { 888 /* we ended up with offset on a page boundary */ 889 *cd->offset = htonl(offset64 >> 32); 890 *cd->offset1 = htonl(offset64 & 0xffffffff); 891 cd->offset1 = NULL; 892 } else { 893 xdr_encode_hyper(cd->offset, offset64); 894 } 895 } 896 897 /* 898 dprintk("encode_entry(%.*s @%ld%s)\n", 899 namlen, name, (long) offset, plus? " plus" : ""); 900 */ 901 902 /* truncate filename if too long */ 903 if (namlen > NFS3_MAXNAMLEN) 904 namlen = NFS3_MAXNAMLEN; 905 906 slen = XDR_QUADLEN(namlen); 907 elen = slen + NFS3_ENTRY_BAGGAGE 908 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0); 909 910 if (cd->buflen < elen) { 911 cd->common.err = nfserr_toosmall; 912 return -EINVAL; 913 } 914 915 /* determine which page in rq_respages[] we are currently filling */ 916 for (pn=1; pn < cd->rqstp->rq_resused; pn++) { 917 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]); 918 919 if (((caddr_t)cd->buffer >= curr_page_addr) && 920 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE)) 921 break; 922 } 923 924 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) { 925 /* encode entry in current page */ 926 927 p = encode_entry_baggage(cd, p, name, namlen, ino); 928 929 if (plus) 930 p = encode_entryplus_baggage(cd, p, name, namlen); 931 num_entry_words = p - cd->buffer; 932 } else if (cd->rqstp->rq_respages[pn+1] != NULL) { 933 /* temporarily encode entry into next page, then move back to 934 * current and next page in rq_respages[] */ 935 __be32 *p1, *tmp; 936 int len1, len2; 937 938 /* grab next page for temporary storage of entry */ 939 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]); 940 941 p1 = encode_entry_baggage(cd, p1, name, namlen, ino); 942 943 if (plus) 944 p1 = encode_entryplus_baggage(cd, p1, name, namlen); 945 946 /* determine entry word length and lengths to go in pages */ 947 num_entry_words = p1 - tmp; 948 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer; 949 if ((num_entry_words << 2) < len1) { 950 /* the actual number of words in the entry is less 951 * than elen and can still fit in the current page 952 */ 953 memmove(p, tmp, num_entry_words << 2); 954 p += num_entry_words; 955 956 /* update offset */ 957 cd->offset = cd->buffer + (cd->offset - tmp); 958 } else { 959 unsigned int offset_r = (cd->offset - tmp) << 2; 960 961 /* update pointer to offset location. 962 * This is a 64bit quantity, so we need to 963 * deal with 3 cases: 964 * - entirely in first page 965 * - entirely in second page 966 * - 4 bytes in each page 967 */ 968 if (offset_r + 8 <= len1) { 969 cd->offset = p + (cd->offset - tmp); 970 } else if (offset_r >= len1) { 971 cd->offset -= len1 >> 2; 972 } else { 973 /* sitting on the fence */ 974 BUG_ON(offset_r != len1 - 4); 975 cd->offset = p + (cd->offset - tmp); 976 cd->offset1 = tmp; 977 } 978 979 len2 = (num_entry_words << 2) - len1; 980 981 /* move from temp page to current and next pages */ 982 memmove(p, tmp, len1); 983 memmove(tmp, (caddr_t)tmp+len1, len2); 984 985 p = tmp + (len2 >> 2); 986 } 987 } 988 else { 989 cd->common.err = nfserr_toosmall; 990 return -EINVAL; 991 } 992 993 cd->buflen -= num_entry_words; 994 cd->buffer = p; 995 cd->common.err = nfs_ok; 996 return 0; 997 998 } 999 1000 int 1001 nfs3svc_encode_entry(void *cd, const char *name, 1002 int namlen, loff_t offset, u64 ino, unsigned int d_type) 1003 { 1004 return encode_entry(cd, name, namlen, offset, ino, d_type, 0); 1005 } 1006 1007 int 1008 nfs3svc_encode_entry_plus(void *cd, const char *name, 1009 int namlen, loff_t offset, u64 ino, 1010 unsigned int d_type) 1011 { 1012 return encode_entry(cd, name, namlen, offset, ino, d_type, 1); 1013 } 1014 1015 /* FSSTAT */ 1016 int 1017 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p, 1018 struct nfsd3_fsstatres *resp) 1019 { 1020 struct kstatfs *s = &resp->stats; 1021 u64 bs = s->f_bsize; 1022 1023 *p++ = xdr_zero; /* no post_op_attr */ 1024 1025 if (resp->status == 0) { 1026 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */ 1027 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */ 1028 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */ 1029 p = xdr_encode_hyper(p, s->f_files); /* total inodes */ 1030 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */ 1031 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */ 1032 *p++ = htonl(resp->invarsec); /* mean unchanged time */ 1033 } 1034 return xdr_ressize_check(rqstp, p); 1035 } 1036 1037 /* FSINFO */ 1038 int 1039 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p, 1040 struct nfsd3_fsinfores *resp) 1041 { 1042 *p++ = xdr_zero; /* no post_op_attr */ 1043 1044 if (resp->status == 0) { 1045 *p++ = htonl(resp->f_rtmax); 1046 *p++ = htonl(resp->f_rtpref); 1047 *p++ = htonl(resp->f_rtmult); 1048 *p++ = htonl(resp->f_wtmax); 1049 *p++ = htonl(resp->f_wtpref); 1050 *p++ = htonl(resp->f_wtmult); 1051 *p++ = htonl(resp->f_dtpref); 1052 p = xdr_encode_hyper(p, resp->f_maxfilesize); 1053 *p++ = xdr_one; 1054 *p++ = xdr_zero; 1055 *p++ = htonl(resp->f_properties); 1056 } 1057 1058 return xdr_ressize_check(rqstp, p); 1059 } 1060 1061 /* PATHCONF */ 1062 int 1063 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p, 1064 struct nfsd3_pathconfres *resp) 1065 { 1066 *p++ = xdr_zero; /* no post_op_attr */ 1067 1068 if (resp->status == 0) { 1069 *p++ = htonl(resp->p_link_max); 1070 *p++ = htonl(resp->p_name_max); 1071 *p++ = htonl(resp->p_no_trunc); 1072 *p++ = htonl(resp->p_chown_restricted); 1073 *p++ = htonl(resp->p_case_insensitive); 1074 *p++ = htonl(resp->p_case_preserving); 1075 } 1076 1077 return xdr_ressize_check(rqstp, p); 1078 } 1079 1080 /* COMMIT */ 1081 int 1082 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p, 1083 struct nfsd3_commitres *resp) 1084 { 1085 p = encode_wcc_data(rqstp, p, &resp->fh); 1086 /* Write verifier */ 1087 if (resp->status == 0) { 1088 *p++ = htonl(nfssvc_boot.tv_sec); 1089 *p++ = htonl(nfssvc_boot.tv_usec); 1090 } 1091 return xdr_ressize_check(rqstp, p); 1092 } 1093 1094 /* 1095 * XDR release functions 1096 */ 1097 int 1098 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p, 1099 struct nfsd3_attrstat *resp) 1100 { 1101 fh_put(&resp->fh); 1102 return 1; 1103 } 1104 1105 int 1106 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p, 1107 struct nfsd3_fhandle_pair *resp) 1108 { 1109 fh_put(&resp->fh1); 1110 fh_put(&resp->fh2); 1111 return 1; 1112 } 1113