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 15 #define NFSDDBG_FACILITY NFSDDBG_XDR 16 17 18 /* 19 * Mapping of S_IF* types to NFS file types 20 */ 21 static u32 nfs3_ftypes[] = { 22 NF3NON, NF3FIFO, NF3CHR, NF3BAD, 23 NF3DIR, NF3BAD, NF3BLK, NF3BAD, 24 NF3REG, NF3BAD, NF3LNK, NF3BAD, 25 NF3SOCK, NF3BAD, NF3LNK, NF3BAD, 26 }; 27 28 /* 29 * XDR functions for basic NFS types 30 */ 31 static __be32 * 32 encode_time3(__be32 *p, struct timespec *time) 33 { 34 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec); 35 return p; 36 } 37 38 static __be32 * 39 decode_time3(__be32 *p, struct timespec *time) 40 { 41 time->tv_sec = ntohl(*p++); 42 time->tv_nsec = ntohl(*p++); 43 return p; 44 } 45 46 static __be32 * 47 decode_fh(__be32 *p, struct svc_fh *fhp) 48 { 49 unsigned int size; 50 fh_init(fhp, NFS3_FHSIZE); 51 size = ntohl(*p++); 52 if (size > NFS3_FHSIZE) 53 return NULL; 54 55 memcpy(&fhp->fh_handle.fh_base, p, size); 56 fhp->fh_handle.fh_size = size; 57 return p + XDR_QUADLEN(size); 58 } 59 60 /* Helper function for NFSv3 ACL code */ 61 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp) 62 { 63 return decode_fh(p, fhp); 64 } 65 66 static __be32 * 67 encode_fh(__be32 *p, struct svc_fh *fhp) 68 { 69 unsigned int size = fhp->fh_handle.fh_size; 70 *p++ = htonl(size); 71 if (size) p[XDR_QUADLEN(size)-1]=0; 72 memcpy(p, &fhp->fh_handle.fh_base, size); 73 return p + XDR_QUADLEN(size); 74 } 75 76 /* 77 * Decode a file name and make sure that the path contains 78 * no slashes or null bytes. 79 */ 80 static __be32 * 81 decode_filename(__be32 *p, char **namp, unsigned int *lenp) 82 { 83 char *name; 84 unsigned int i; 85 86 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) { 87 for (i = 0, name = *namp; i < *lenp; i++, name++) { 88 if (*name == '\0' || *name == '/') 89 return NULL; 90 } 91 } 92 93 return p; 94 } 95 96 static __be32 * 97 decode_sattr3(__be32 *p, struct iattr *iap) 98 { 99 u32 tmp; 100 101 iap->ia_valid = 0; 102 103 if (*p++) { 104 iap->ia_valid |= ATTR_MODE; 105 iap->ia_mode = ntohl(*p++); 106 } 107 if (*p++) { 108 iap->ia_valid |= ATTR_UID; 109 iap->ia_uid = ntohl(*p++); 110 } 111 if (*p++) { 112 iap->ia_valid |= ATTR_GID; 113 iap->ia_gid = ntohl(*p++); 114 } 115 if (*p++) { 116 u64 newsize; 117 118 iap->ia_valid |= ATTR_SIZE; 119 p = xdr_decode_hyper(p, &newsize); 120 if (newsize <= NFS_OFFSET_MAX) 121 iap->ia_size = newsize; 122 else 123 iap->ia_size = 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_inode->i_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); 169 *p++ = htonl((u32) stat->nlink); 170 *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid)); 171 *p++ = htonl((u32) nfsd_rgid(rqstp, 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 && dentry->d_inode) { 207 int err; 208 struct kstat stat; 209 210 err = vfs_getattr(fhp->fh_export->ex_path.mnt, dentry, &stat); 211 if (!err) { 212 *p++ = xdr_one; /* attributes follow */ 213 lease_get_mtime(dentry->d_inode, &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 && dentry->d_inode && 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 int err; 258 259 if (fhp->fh_post_saved) 260 printk("nfsd: inode locked twice during operation.\n"); 261 262 err = vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry, 263 &fhp->fh_post_attr); 264 fhp->fh_post_change = fhp->fh_dentry->d_inode->i_version; 265 if (err) { 266 fhp->fh_post_saved = 0; 267 /* Grab the ctime anyway - set_change_info might use it */ 268 fhp->fh_post_attr.ctime = fhp->fh_dentry->d_inode->i_ctime; 269 } else 270 fhp->fh_post_saved = 1; 271 } 272 273 /* 274 * XDR decode functions 275 */ 276 int 277 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args) 278 { 279 if (!(p = decode_fh(p, &args->fh))) 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 if (!(p = decode_fh(p, &args->fh))) 289 return 0; 290 p = decode_sattr3(p, &args->attrs); 291 292 if ((args->check_guard = ntohl(*p++)) != 0) { 293 struct timespec time; 294 p = decode_time3(p, &time); 295 args->guardtime = time.tv_sec; 296 } 297 298 return xdr_argsize_check(rqstp, p); 299 } 300 301 int 302 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p, 303 struct nfsd3_diropargs *args) 304 { 305 if (!(p = decode_fh(p, &args->fh)) 306 || !(p = decode_filename(p, &args->name, &args->len))) 307 return 0; 308 309 return xdr_argsize_check(rqstp, p); 310 } 311 312 int 313 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p, 314 struct nfsd3_accessargs *args) 315 { 316 if (!(p = decode_fh(p, &args->fh))) 317 return 0; 318 args->access = ntohl(*p++); 319 320 return xdr_argsize_check(rqstp, p); 321 } 322 323 int 324 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p, 325 struct nfsd3_readargs *args) 326 { 327 unsigned int len; 328 int v; 329 u32 max_blocksize = svc_max_payload(rqstp); 330 331 if (!(p = decode_fh(p, &args->fh))) 332 return 0; 333 p = xdr_decode_hyper(p, &args->offset); 334 335 len = args->count = ntohl(*p++); 336 337 if (len > max_blocksize) 338 len = max_blocksize; 339 340 /* set up the kvec */ 341 v=0; 342 while (len > 0) { 343 struct page *p = *(rqstp->rq_next_page++); 344 345 rqstp->rq_vec[v].iov_base = page_address(p); 346 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE; 347 len -= rqstp->rq_vec[v].iov_len; 348 v++; 349 } 350 args->vlen = v; 351 return xdr_argsize_check(rqstp, p); 352 } 353 354 int 355 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p, 356 struct nfsd3_writeargs *args) 357 { 358 unsigned int len, v, hdr, dlen; 359 u32 max_blocksize = svc_max_payload(rqstp); 360 361 if (!(p = decode_fh(p, &args->fh))) 362 return 0; 363 p = xdr_decode_hyper(p, &args->offset); 364 365 args->count = ntohl(*p++); 366 args->stable = ntohl(*p++); 367 len = args->len = ntohl(*p++); 368 /* 369 * The count must equal the amount of data passed. 370 */ 371 if (args->count != args->len) 372 return 0; 373 374 /* 375 * Check to make sure that we got the right number of 376 * bytes. 377 */ 378 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base; 379 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len 380 - hdr; 381 /* 382 * Round the length of the data which was specified up to 383 * the next multiple of XDR units and then compare that 384 * against the length which was actually received. 385 * Note that when RPCSEC/GSS (for example) is used, the 386 * data buffer can be padded so dlen might be larger 387 * than required. It must never be smaller. 388 */ 389 if (dlen < XDR_QUADLEN(len)*4) 390 return 0; 391 392 if (args->count > max_blocksize) { 393 args->count = max_blocksize; 394 len = args->len = max_blocksize; 395 } 396 rqstp->rq_vec[0].iov_base = (void*)p; 397 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr; 398 v = 0; 399 while (len > rqstp->rq_vec[v].iov_len) { 400 len -= rqstp->rq_vec[v].iov_len; 401 v++; 402 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]); 403 rqstp->rq_vec[v].iov_len = PAGE_SIZE; 404 } 405 rqstp->rq_vec[v].iov_len = len; 406 args->vlen = v + 1; 407 return 1; 408 } 409 410 int 411 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p, 412 struct nfsd3_createargs *args) 413 { 414 if (!(p = decode_fh(p, &args->fh)) 415 || !(p = decode_filename(p, &args->name, &args->len))) 416 return 0; 417 418 switch (args->createmode = ntohl(*p++)) { 419 case NFS3_CREATE_UNCHECKED: 420 case NFS3_CREATE_GUARDED: 421 p = decode_sattr3(p, &args->attrs); 422 break; 423 case NFS3_CREATE_EXCLUSIVE: 424 args->verf = p; 425 p += 2; 426 break; 427 default: 428 return 0; 429 } 430 431 return xdr_argsize_check(rqstp, p); 432 } 433 int 434 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p, 435 struct nfsd3_createargs *args) 436 { 437 if (!(p = decode_fh(p, &args->fh)) || 438 !(p = decode_filename(p, &args->name, &args->len))) 439 return 0; 440 p = decode_sattr3(p, &args->attrs); 441 442 return xdr_argsize_check(rqstp, p); 443 } 444 445 int 446 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p, 447 struct nfsd3_symlinkargs *args) 448 { 449 unsigned int len, avail; 450 char *old, *new; 451 struct kvec *vec; 452 453 if (!(p = decode_fh(p, &args->ffh)) || 454 !(p = decode_filename(p, &args->fname, &args->flen)) 455 ) 456 return 0; 457 p = decode_sattr3(p, &args->attrs); 458 459 /* now decode the pathname, which might be larger than the first page. 460 * As we have to check for nul's anyway, we copy it into a new page 461 * This page appears in the rq_res.pages list, but as pages_len is always 462 * 0, it won't get in the way 463 */ 464 len = ntohl(*p++); 465 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE) 466 return 0; 467 args->tname = new = page_address(*(rqstp->rq_next_page++)); 468 args->tlen = len; 469 /* first copy and check from the first page */ 470 old = (char*)p; 471 vec = &rqstp->rq_arg.head[0]; 472 avail = vec->iov_len - (old - (char*)vec->iov_base); 473 while (len && avail && *old) { 474 *new++ = *old++; 475 len--; 476 avail--; 477 } 478 /* now copy next page if there is one */ 479 if (len && !avail && rqstp->rq_arg.page_len) { 480 avail = rqstp->rq_arg.page_len; 481 if (avail > PAGE_SIZE) 482 avail = PAGE_SIZE; 483 old = page_address(rqstp->rq_arg.pages[0]); 484 } 485 while (len && avail && *old) { 486 *new++ = *old++; 487 len--; 488 avail--; 489 } 490 *new = '\0'; 491 if (len) 492 return 0; 493 494 return 1; 495 } 496 497 int 498 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p, 499 struct nfsd3_mknodargs *args) 500 { 501 if (!(p = decode_fh(p, &args->fh)) 502 || !(p = decode_filename(p, &args->name, &args->len))) 503 return 0; 504 505 args->ftype = ntohl(*p++); 506 507 if (args->ftype == NF3BLK || args->ftype == NF3CHR 508 || args->ftype == NF3SOCK || args->ftype == NF3FIFO) 509 p = decode_sattr3(p, &args->attrs); 510 511 if (args->ftype == NF3BLK || args->ftype == NF3CHR) { 512 args->major = ntohl(*p++); 513 args->minor = ntohl(*p++); 514 } 515 516 return xdr_argsize_check(rqstp, p); 517 } 518 519 int 520 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p, 521 struct nfsd3_renameargs *args) 522 { 523 if (!(p = decode_fh(p, &args->ffh)) 524 || !(p = decode_filename(p, &args->fname, &args->flen)) 525 || !(p = decode_fh(p, &args->tfh)) 526 || !(p = decode_filename(p, &args->tname, &args->tlen))) 527 return 0; 528 529 return xdr_argsize_check(rqstp, p); 530 } 531 532 int 533 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, 534 struct nfsd3_readlinkargs *args) 535 { 536 if (!(p = decode_fh(p, &args->fh))) 537 return 0; 538 args->buffer = page_address(*(rqstp->rq_next_page++)); 539 540 return xdr_argsize_check(rqstp, p); 541 } 542 543 int 544 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p, 545 struct nfsd3_linkargs *args) 546 { 547 if (!(p = decode_fh(p, &args->ffh)) 548 || !(p = decode_fh(p, &args->tfh)) 549 || !(p = decode_filename(p, &args->tname, &args->tlen))) 550 return 0; 551 552 return xdr_argsize_check(rqstp, p); 553 } 554 555 int 556 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p, 557 struct nfsd3_readdirargs *args) 558 { 559 if (!(p = decode_fh(p, &args->fh))) 560 return 0; 561 p = xdr_decode_hyper(p, &args->cookie); 562 args->verf = p; p += 2; 563 args->dircount = ~0; 564 args->count = ntohl(*p++); 565 566 if (args->count > PAGE_SIZE) 567 args->count = PAGE_SIZE; 568 569 args->buffer = page_address(*(rqstp->rq_next_page++)); 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; 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 struct page *p = *(rqstp->rq_next_page++); 594 if (!args->buffer) 595 args->buffer = page_address(p); 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 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 724 725 p = encode_wcc_data(rqstp, p, &resp->fh); 726 if (resp->status == 0) { 727 *p++ = htonl(resp->count); 728 *p++ = htonl(resp->committed); 729 *p++ = htonl(nn->nfssvc_boot.tv_sec); 730 *p++ = htonl(nn->nfssvc_boot.tv_usec); 731 } 732 return xdr_ressize_check(rqstp, p); 733 } 734 735 /* CREATE, MKDIR, SYMLINK, MKNOD */ 736 int 737 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p, 738 struct nfsd3_diropres *resp) 739 { 740 if (resp->status == 0) { 741 *p++ = xdr_one; 742 p = encode_fh(p, &resp->fh); 743 p = encode_post_op_attr(rqstp, p, &resp->fh); 744 } 745 p = encode_wcc_data(rqstp, p, &resp->dirfh); 746 return xdr_ressize_check(rqstp, p); 747 } 748 749 /* RENAME */ 750 int 751 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p, 752 struct nfsd3_renameres *resp) 753 { 754 p = encode_wcc_data(rqstp, p, &resp->ffh); 755 p = encode_wcc_data(rqstp, p, &resp->tfh); 756 return xdr_ressize_check(rqstp, p); 757 } 758 759 /* LINK */ 760 int 761 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p, 762 struct nfsd3_linkres *resp) 763 { 764 p = encode_post_op_attr(rqstp, p, &resp->fh); 765 p = encode_wcc_data(rqstp, p, &resp->tfh); 766 return xdr_ressize_check(rqstp, p); 767 } 768 769 /* READDIR */ 770 int 771 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p, 772 struct nfsd3_readdirres *resp) 773 { 774 p = encode_post_op_attr(rqstp, p, &resp->fh); 775 776 if (resp->status == 0) { 777 /* stupid readdir cookie */ 778 memcpy(p, resp->verf, 8); p += 2; 779 xdr_ressize_check(rqstp, p); 780 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE) 781 return 1; /*No room for trailer */ 782 rqstp->rq_res.page_len = (resp->count) << 2; 783 784 /* add the 'tail' to the end of the 'head' page - page 0. */ 785 rqstp->rq_res.tail[0].iov_base = p; 786 *p++ = 0; /* no more entries */ 787 *p++ = htonl(resp->common.err == nfserr_eof); 788 rqstp->rq_res.tail[0].iov_len = 2<<2; 789 return 1; 790 } else 791 return xdr_ressize_check(rqstp, p); 792 } 793 794 static __be32 * 795 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, 796 int namlen, u64 ino) 797 { 798 *p++ = xdr_one; /* mark entry present */ 799 p = xdr_encode_hyper(p, ino); /* file id */ 800 p = xdr_encode_array(p, name, namlen);/* name length & name */ 801 802 cd->offset = p; /* remember pointer */ 803 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */ 804 805 return p; 806 } 807 808 static __be32 809 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, 810 const char *name, int namlen) 811 { 812 struct svc_export *exp; 813 struct dentry *dparent, *dchild; 814 __be32 rv = nfserr_noent; 815 816 dparent = cd->fh.fh_dentry; 817 exp = cd->fh.fh_export; 818 819 if (isdotent(name, namlen)) { 820 if (namlen == 2) { 821 dchild = dget_parent(dparent); 822 /* filesystem root - cannot return filehandle for ".." */ 823 if (dchild == dparent) 824 goto out; 825 } else 826 dchild = dget(dparent); 827 } else 828 dchild = lookup_one_len(name, dparent, namlen); 829 if (IS_ERR(dchild)) 830 return rv; 831 if (d_mountpoint(dchild)) 832 goto out; 833 if (!dchild->d_inode) 834 goto out; 835 rv = fh_compose(fhp, exp, dchild, &cd->fh); 836 out: 837 dput(dchild); 838 return rv; 839 } 840 841 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen) 842 { 843 struct svc_fh fh; 844 __be32 err; 845 846 fh_init(&fh, NFS3_FHSIZE); 847 err = compose_entry_fh(cd, &fh, name, namlen); 848 if (err) { 849 *p++ = 0; 850 *p++ = 0; 851 goto out; 852 } 853 p = encode_post_op_attr(cd->rqstp, p, &fh); 854 *p++ = xdr_one; /* yes, a file handle follows */ 855 p = encode_fh(p, &fh); 856 out: 857 fh_put(&fh); 858 return p; 859 } 860 861 /* 862 * Encode a directory entry. This one works for both normal readdir 863 * and readdirplus. 864 * The normal readdir reply requires 2 (fileid) + 1 (stringlen) 865 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen. 866 * 867 * The readdirplus baggage is 1+21 words for post_op_attr, plus the 868 * file handle. 869 */ 870 871 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1) 872 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2)) 873 static int 874 encode_entry(struct readdir_cd *ccd, const char *name, int namlen, 875 loff_t offset, u64 ino, unsigned int d_type, int plus) 876 { 877 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres, 878 common); 879 __be32 *p = cd->buffer; 880 caddr_t curr_page_addr = NULL; 881 struct page ** page; 882 int slen; /* string (name) length */ 883 int elen; /* estimated entry length in words */ 884 int num_entry_words = 0; /* actual number of words */ 885 886 if (cd->offset) { 887 u64 offset64 = offset; 888 889 if (unlikely(cd->offset1)) { 890 /* we ended up with offset on a page boundary */ 891 *cd->offset = htonl(offset64 >> 32); 892 *cd->offset1 = htonl(offset64 & 0xffffffff); 893 cd->offset1 = NULL; 894 } else { 895 xdr_encode_hyper(cd->offset, offset64); 896 } 897 } 898 899 /* 900 dprintk("encode_entry(%.*s @%ld%s)\n", 901 namlen, name, (long) offset, plus? " plus" : ""); 902 */ 903 904 /* truncate filename if too long */ 905 if (namlen > NFS3_MAXNAMLEN) 906 namlen = NFS3_MAXNAMLEN; 907 908 slen = XDR_QUADLEN(namlen); 909 elen = slen + NFS3_ENTRY_BAGGAGE 910 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0); 911 912 if (cd->buflen < elen) { 913 cd->common.err = nfserr_toosmall; 914 return -EINVAL; 915 } 916 917 /* determine which page in rq_respages[] we are currently filling */ 918 for (page = cd->rqstp->rq_respages + 1; 919 page < cd->rqstp->rq_next_page; page++) { 920 curr_page_addr = page_address(*page); 921 922 if (((caddr_t)cd->buffer >= curr_page_addr) && 923 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE)) 924 break; 925 } 926 927 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) { 928 /* encode entry in current page */ 929 930 p = encode_entry_baggage(cd, p, name, namlen, ino); 931 932 if (plus) 933 p = encode_entryplus_baggage(cd, p, name, namlen); 934 num_entry_words = p - cd->buffer; 935 } else if (*(page+1) != NULL) { 936 /* temporarily encode entry into next page, then move back to 937 * current and next page in rq_respages[] */ 938 __be32 *p1, *tmp; 939 int len1, len2; 940 941 /* grab next page for temporary storage of entry */ 942 p1 = tmp = page_address(*(page+1)); 943 944 p1 = encode_entry_baggage(cd, p1, name, namlen, ino); 945 946 if (plus) 947 p1 = encode_entryplus_baggage(cd, p1, name, namlen); 948 949 /* determine entry word length and lengths to go in pages */ 950 num_entry_words = p1 - tmp; 951 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer; 952 if ((num_entry_words << 2) < len1) { 953 /* the actual number of words in the entry is less 954 * than elen and can still fit in the current page 955 */ 956 memmove(p, tmp, num_entry_words << 2); 957 p += num_entry_words; 958 959 /* update offset */ 960 cd->offset = cd->buffer + (cd->offset - tmp); 961 } else { 962 unsigned int offset_r = (cd->offset - tmp) << 2; 963 964 /* update pointer to offset location. 965 * This is a 64bit quantity, so we need to 966 * deal with 3 cases: 967 * - entirely in first page 968 * - entirely in second page 969 * - 4 bytes in each page 970 */ 971 if (offset_r + 8 <= len1) { 972 cd->offset = p + (cd->offset - tmp); 973 } else if (offset_r >= len1) { 974 cd->offset -= len1 >> 2; 975 } else { 976 /* sitting on the fence */ 977 BUG_ON(offset_r != len1 - 4); 978 cd->offset = p + (cd->offset - tmp); 979 cd->offset1 = tmp; 980 } 981 982 len2 = (num_entry_words << 2) - len1; 983 984 /* move from temp page to current and next pages */ 985 memmove(p, tmp, len1); 986 memmove(tmp, (caddr_t)tmp+len1, len2); 987 988 p = tmp + (len2 >> 2); 989 } 990 } 991 else { 992 cd->common.err = nfserr_toosmall; 993 return -EINVAL; 994 } 995 996 cd->buflen -= num_entry_words; 997 cd->buffer = p; 998 cd->common.err = nfs_ok; 999 return 0; 1000 1001 } 1002 1003 int 1004 nfs3svc_encode_entry(void *cd, const char *name, 1005 int namlen, loff_t offset, u64 ino, unsigned int d_type) 1006 { 1007 return encode_entry(cd, name, namlen, offset, ino, d_type, 0); 1008 } 1009 1010 int 1011 nfs3svc_encode_entry_plus(void *cd, const char *name, 1012 int namlen, loff_t offset, u64 ino, 1013 unsigned int d_type) 1014 { 1015 return encode_entry(cd, name, namlen, offset, ino, d_type, 1); 1016 } 1017 1018 /* FSSTAT */ 1019 int 1020 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p, 1021 struct nfsd3_fsstatres *resp) 1022 { 1023 struct kstatfs *s = &resp->stats; 1024 u64 bs = s->f_bsize; 1025 1026 *p++ = xdr_zero; /* no post_op_attr */ 1027 1028 if (resp->status == 0) { 1029 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */ 1030 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */ 1031 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */ 1032 p = xdr_encode_hyper(p, s->f_files); /* total inodes */ 1033 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */ 1034 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */ 1035 *p++ = htonl(resp->invarsec); /* mean unchanged time */ 1036 } 1037 return xdr_ressize_check(rqstp, p); 1038 } 1039 1040 /* FSINFO */ 1041 int 1042 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p, 1043 struct nfsd3_fsinfores *resp) 1044 { 1045 *p++ = xdr_zero; /* no post_op_attr */ 1046 1047 if (resp->status == 0) { 1048 *p++ = htonl(resp->f_rtmax); 1049 *p++ = htonl(resp->f_rtpref); 1050 *p++ = htonl(resp->f_rtmult); 1051 *p++ = htonl(resp->f_wtmax); 1052 *p++ = htonl(resp->f_wtpref); 1053 *p++ = htonl(resp->f_wtmult); 1054 *p++ = htonl(resp->f_dtpref); 1055 p = xdr_encode_hyper(p, resp->f_maxfilesize); 1056 *p++ = xdr_one; 1057 *p++ = xdr_zero; 1058 *p++ = htonl(resp->f_properties); 1059 } 1060 1061 return xdr_ressize_check(rqstp, p); 1062 } 1063 1064 /* PATHCONF */ 1065 int 1066 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p, 1067 struct nfsd3_pathconfres *resp) 1068 { 1069 *p++ = xdr_zero; /* no post_op_attr */ 1070 1071 if (resp->status == 0) { 1072 *p++ = htonl(resp->p_link_max); 1073 *p++ = htonl(resp->p_name_max); 1074 *p++ = htonl(resp->p_no_trunc); 1075 *p++ = htonl(resp->p_chown_restricted); 1076 *p++ = htonl(resp->p_case_insensitive); 1077 *p++ = htonl(resp->p_case_preserving); 1078 } 1079 1080 return xdr_ressize_check(rqstp, p); 1081 } 1082 1083 /* COMMIT */ 1084 int 1085 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p, 1086 struct nfsd3_commitres *resp) 1087 { 1088 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 1089 1090 p = encode_wcc_data(rqstp, p, &resp->fh); 1091 /* Write verifier */ 1092 if (resp->status == 0) { 1093 *p++ = htonl(nn->nfssvc_boot.tv_sec); 1094 *p++ = htonl(nn->nfssvc_boot.tv_usec); 1095 } 1096 return xdr_ressize_check(rqstp, p); 1097 } 1098 1099 /* 1100 * XDR release functions 1101 */ 1102 int 1103 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p, 1104 struct nfsd3_attrstat *resp) 1105 { 1106 fh_put(&resp->fh); 1107 return 1; 1108 } 1109 1110 int 1111 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p, 1112 struct nfsd3_fhandle_pair *resp) 1113 { 1114 fh_put(&resp->fh1); 1115 fh_put(&resp->fh2); 1116 return 1; 1117 } 1118