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