1 /* 2 * linux/fs/nfsd/nfs3xdr.c 3 * 4 * XDR support for nfsd/protocol version 3. 5 * 6 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> 7 * 8 * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()! 9 */ 10 11 #include <linux/types.h> 12 #include <linux/time.h> 13 #include <linux/nfs3.h> 14 #include <linux/list.h> 15 #include <linux/spinlock.h> 16 #include <linux/dcache.h> 17 #include <linux/namei.h> 18 #include <linux/mm.h> 19 #include <linux/vfs.h> 20 #include <linux/sunrpc/xdr.h> 21 #include <linux/sunrpc/svc.h> 22 #include <linux/nfsd/nfsd.h> 23 #include <linux/nfsd/xdr3.h> 24 25 #define NFSDDBG_FACILITY NFSDDBG_XDR 26 27 28 /* 29 * Mapping of S_IF* types to NFS file types 30 */ 31 static u32 nfs3_ftypes[] = { 32 NF3NON, NF3FIFO, NF3CHR, NF3BAD, 33 NF3DIR, NF3BAD, NF3BLK, NF3BAD, 34 NF3REG, NF3BAD, NF3LNK, NF3BAD, 35 NF3SOCK, NF3BAD, NF3LNK, NF3BAD, 36 }; 37 38 /* 39 * XDR functions for basic NFS types 40 */ 41 static __be32 * 42 encode_time3(__be32 *p, struct timespec *time) 43 { 44 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec); 45 return p; 46 } 47 48 static __be32 * 49 decode_time3(__be32 *p, struct timespec *time) 50 { 51 time->tv_sec = ntohl(*p++); 52 time->tv_nsec = ntohl(*p++); 53 return p; 54 } 55 56 static __be32 * 57 decode_fh(__be32 *p, struct svc_fh *fhp) 58 { 59 unsigned int size; 60 fh_init(fhp, NFS3_FHSIZE); 61 size = ntohl(*p++); 62 if (size > NFS3_FHSIZE) 63 return NULL; 64 65 memcpy(&fhp->fh_handle.fh_base, p, size); 66 fhp->fh_handle.fh_size = size; 67 return p + XDR_QUADLEN(size); 68 } 69 70 /* Helper function for NFSv3 ACL code */ 71 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp) 72 { 73 return decode_fh(p, fhp); 74 } 75 76 static __be32 * 77 encode_fh(__be32 *p, struct svc_fh *fhp) 78 { 79 unsigned int size = fhp->fh_handle.fh_size; 80 *p++ = htonl(size); 81 if (size) p[XDR_QUADLEN(size)-1]=0; 82 memcpy(p, &fhp->fh_handle.fh_base, size); 83 return p + XDR_QUADLEN(size); 84 } 85 86 /* 87 * Decode a file name and make sure that the path contains 88 * no slashes or null bytes. 89 */ 90 static __be32 * 91 decode_filename(__be32 *p, char **namp, int *lenp) 92 { 93 char *name; 94 int i; 95 96 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) { 97 for (i = 0, name = *namp; i < *lenp; i++, name++) { 98 if (*name == '\0' || *name == '/') 99 return NULL; 100 } 101 } 102 103 return p; 104 } 105 106 static __be32 * 107 decode_sattr3(__be32 *p, struct iattr *iap) 108 { 109 u32 tmp; 110 111 iap->ia_valid = 0; 112 113 if (*p++) { 114 iap->ia_valid |= ATTR_MODE; 115 iap->ia_mode = ntohl(*p++); 116 } 117 if (*p++) { 118 iap->ia_valid |= ATTR_UID; 119 iap->ia_uid = ntohl(*p++); 120 } 121 if (*p++) { 122 iap->ia_valid |= ATTR_GID; 123 iap->ia_gid = ntohl(*p++); 124 } 125 if (*p++) { 126 u64 newsize; 127 128 iap->ia_valid |= ATTR_SIZE; 129 p = xdr_decode_hyper(p, &newsize); 130 if (newsize <= NFS_OFFSET_MAX) 131 iap->ia_size = newsize; 132 else 133 iap->ia_size = NFS_OFFSET_MAX; 134 } 135 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ 136 iap->ia_valid |= ATTR_ATIME; 137 } else if (tmp == 2) { /* set to client time */ 138 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; 139 iap->ia_atime.tv_sec = ntohl(*p++); 140 iap->ia_atime.tv_nsec = ntohl(*p++); 141 } 142 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ 143 iap->ia_valid |= ATTR_MTIME; 144 } else if (tmp == 2) { /* set to client time */ 145 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; 146 iap->ia_mtime.tv_sec = ntohl(*p++); 147 iap->ia_mtime.tv_nsec = ntohl(*p++); 148 } 149 return p; 150 } 151 152 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp) 153 { 154 u64 f; 155 switch(fsid_source(fhp)) { 156 default: 157 case FSIDSOURCE_DEV: 158 p = xdr_encode_hyper(p, (u64)huge_encode_dev 159 (fhp->fh_dentry->d_inode->i_sb->s_dev)); 160 break; 161 case FSIDSOURCE_FSID: 162 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); 163 break; 164 case FSIDSOURCE_UUID: 165 f = ((u64*)fhp->fh_export->ex_uuid)[0]; 166 f ^= ((u64*)fhp->fh_export->ex_uuid)[1]; 167 p = xdr_encode_hyper(p, f); 168 break; 169 } 170 return p; 171 } 172 173 static __be32 * 174 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, 175 struct kstat *stat) 176 { 177 struct dentry *dentry = fhp->fh_dentry; 178 struct timespec time; 179 180 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]); 181 *p++ = htonl((u32) stat->mode); 182 *p++ = htonl((u32) stat->nlink); 183 *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid)); 184 *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid)); 185 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) { 186 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); 187 } else { 188 p = xdr_encode_hyper(p, (u64) stat->size); 189 } 190 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9); 191 *p++ = htonl((u32) MAJOR(stat->rdev)); 192 *p++ = htonl((u32) MINOR(stat->rdev)); 193 p = encode_fsid(p, fhp); 194 p = xdr_encode_hyper(p, (u64) stat->ino); 195 p = encode_time3(p, &stat->atime); 196 lease_get_mtime(dentry->d_inode, &time); 197 p = encode_time3(p, &time); 198 p = encode_time3(p, &stat->ctime); 199 200 return p; 201 } 202 203 static __be32 * 204 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 205 { 206 struct inode *inode = fhp->fh_dentry->d_inode; 207 208 /* Attributes to follow */ 209 *p++ = xdr_one; 210 211 *p++ = htonl(nfs3_ftypes[(fhp->fh_post_mode & S_IFMT) >> 12]); 212 *p++ = htonl((u32) fhp->fh_post_mode); 213 *p++ = htonl((u32) fhp->fh_post_nlink); 214 *p++ = htonl((u32) nfsd_ruid(rqstp, fhp->fh_post_uid)); 215 *p++ = htonl((u32) nfsd_rgid(rqstp, fhp->fh_post_gid)); 216 if (S_ISLNK(fhp->fh_post_mode) && fhp->fh_post_size > NFS3_MAXPATHLEN) { 217 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); 218 } else { 219 p = xdr_encode_hyper(p, (u64) fhp->fh_post_size); 220 } 221 p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9); 222 *p++ = fhp->fh_post_rdev[0]; 223 *p++ = fhp->fh_post_rdev[1]; 224 p = encode_fsid(p, fhp); 225 p = xdr_encode_hyper(p, (u64) inode->i_ino); 226 p = encode_time3(p, &fhp->fh_post_atime); 227 p = encode_time3(p, &fhp->fh_post_mtime); 228 p = encode_time3(p, &fhp->fh_post_ctime); 229 230 return p; 231 } 232 233 /* 234 * Encode post-operation attributes. 235 * The inode may be NULL if the call failed because of a stale file 236 * handle. In this case, no attributes are returned. 237 */ 238 static __be32 * 239 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 240 { 241 struct dentry *dentry = fhp->fh_dentry; 242 if (dentry && dentry->d_inode) { 243 int err; 244 struct kstat stat; 245 246 err = vfs_getattr(fhp->fh_export->ex_mnt, dentry, &stat); 247 if (!err) { 248 *p++ = xdr_one; /* attributes follow */ 249 return encode_fattr3(rqstp, p, fhp, &stat); 250 } 251 } 252 *p++ = xdr_zero; 253 return p; 254 } 255 256 /* Helper for NFSv3 ACLs */ 257 __be32 * 258 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 259 { 260 return encode_post_op_attr(rqstp, p, fhp); 261 } 262 263 /* 264 * Enocde weak cache consistency data 265 */ 266 static __be32 * 267 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 268 { 269 struct dentry *dentry = fhp->fh_dentry; 270 271 if (dentry && dentry->d_inode && fhp->fh_post_saved) { 272 if (fhp->fh_pre_saved) { 273 *p++ = xdr_one; 274 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size); 275 p = encode_time3(p, &fhp->fh_pre_mtime); 276 p = encode_time3(p, &fhp->fh_pre_ctime); 277 } else { 278 *p++ = xdr_zero; 279 } 280 return encode_saved_post_attr(rqstp, p, fhp); 281 } 282 /* no pre- or post-attrs */ 283 *p++ = xdr_zero; 284 return encode_post_op_attr(rqstp, p, fhp); 285 } 286 287 288 /* 289 * XDR decode functions 290 */ 291 int 292 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args) 293 { 294 if (!(p = decode_fh(p, &args->fh))) 295 return 0; 296 return xdr_argsize_check(rqstp, p); 297 } 298 299 int 300 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p, 301 struct nfsd3_sattrargs *args) 302 { 303 if (!(p = decode_fh(p, &args->fh))) 304 return 0; 305 p = decode_sattr3(p, &args->attrs); 306 307 if ((args->check_guard = ntohl(*p++)) != 0) { 308 struct timespec time; 309 p = decode_time3(p, &time); 310 args->guardtime = time.tv_sec; 311 } 312 313 return xdr_argsize_check(rqstp, p); 314 } 315 316 int 317 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p, 318 struct nfsd3_diropargs *args) 319 { 320 if (!(p = decode_fh(p, &args->fh)) 321 || !(p = decode_filename(p, &args->name, &args->len))) 322 return 0; 323 324 return xdr_argsize_check(rqstp, p); 325 } 326 327 int 328 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p, 329 struct nfsd3_accessargs *args) 330 { 331 if (!(p = decode_fh(p, &args->fh))) 332 return 0; 333 args->access = ntohl(*p++); 334 335 return xdr_argsize_check(rqstp, p); 336 } 337 338 int 339 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p, 340 struct nfsd3_readargs *args) 341 { 342 unsigned int len; 343 int v,pn; 344 u32 max_blocksize = svc_max_payload(rqstp); 345 346 if (!(p = decode_fh(p, &args->fh))) 347 return 0; 348 p = xdr_decode_hyper(p, &args->offset); 349 350 len = args->count = ntohl(*p++); 351 352 if (len > max_blocksize) 353 len = max_blocksize; 354 355 /* set up the kvec */ 356 v=0; 357 while (len > 0) { 358 pn = rqstp->rq_resused++; 359 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]); 360 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE; 361 len -= rqstp->rq_vec[v].iov_len; 362 v++; 363 } 364 args->vlen = v; 365 return xdr_argsize_check(rqstp, p); 366 } 367 368 int 369 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p, 370 struct nfsd3_writeargs *args) 371 { 372 unsigned int len, v, hdr, dlen; 373 u32 max_blocksize = svc_max_payload(rqstp); 374 375 if (!(p = decode_fh(p, &args->fh))) 376 return 0; 377 p = xdr_decode_hyper(p, &args->offset); 378 379 args->count = ntohl(*p++); 380 args->stable = ntohl(*p++); 381 len = args->len = ntohl(*p++); 382 /* 383 * The count must equal the amount of data passed. 384 */ 385 if (args->count != args->len) 386 return 0; 387 388 /* 389 * Check to make sure that we got the right number of 390 * bytes. 391 */ 392 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base; 393 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len 394 - hdr; 395 /* 396 * Round the length of the data which was specified up to 397 * the next multiple of XDR units and then compare that 398 * against the length which was actually received. 399 */ 400 if (dlen != XDR_QUADLEN(len)*4) 401 return 0; 402 403 if (args->count > max_blocksize) { 404 args->count = max_blocksize; 405 len = args->len = max_blocksize; 406 } 407 rqstp->rq_vec[0].iov_base = (void*)p; 408 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr; 409 v = 0; 410 while (len > rqstp->rq_vec[v].iov_len) { 411 len -= rqstp->rq_vec[v].iov_len; 412 v++; 413 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]); 414 rqstp->rq_vec[v].iov_len = PAGE_SIZE; 415 } 416 rqstp->rq_vec[v].iov_len = len; 417 args->vlen = v + 1; 418 return 1; 419 } 420 421 int 422 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p, 423 struct nfsd3_createargs *args) 424 { 425 if (!(p = decode_fh(p, &args->fh)) 426 || !(p = decode_filename(p, &args->name, &args->len))) 427 return 0; 428 429 switch (args->createmode = ntohl(*p++)) { 430 case NFS3_CREATE_UNCHECKED: 431 case NFS3_CREATE_GUARDED: 432 p = decode_sattr3(p, &args->attrs); 433 break; 434 case NFS3_CREATE_EXCLUSIVE: 435 args->verf = p; 436 p += 2; 437 break; 438 default: 439 return 0; 440 } 441 442 return xdr_argsize_check(rqstp, p); 443 } 444 int 445 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p, 446 struct nfsd3_createargs *args) 447 { 448 if (!(p = decode_fh(p, &args->fh)) || 449 !(p = decode_filename(p, &args->name, &args->len))) 450 return 0; 451 p = decode_sattr3(p, &args->attrs); 452 453 return xdr_argsize_check(rqstp, p); 454 } 455 456 int 457 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p, 458 struct nfsd3_symlinkargs *args) 459 { 460 unsigned int len; 461 int avail; 462 char *old, *new; 463 struct kvec *vec; 464 465 if (!(p = decode_fh(p, &args->ffh)) || 466 !(p = decode_filename(p, &args->fname, &args->flen)) 467 ) 468 return 0; 469 p = decode_sattr3(p, &args->attrs); 470 471 /* now decode the pathname, which might be larger than the first page. 472 * As we have to check for nul's anyway, we copy it into a new page 473 * This page appears in the rq_res.pages list, but as pages_len is always 474 * 0, it won't get in the way 475 */ 476 len = ntohl(*p++); 477 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE) 478 return 0; 479 args->tname = new = 480 page_address(rqstp->rq_respages[rqstp->rq_resused++]); 481 args->tlen = len; 482 /* first copy and check from the first page */ 483 old = (char*)p; 484 vec = &rqstp->rq_arg.head[0]; 485 avail = vec->iov_len - (old - (char*)vec->iov_base); 486 while (len && avail && *old) { 487 *new++ = *old++; 488 len--; 489 avail--; 490 } 491 /* now copy next page if there is one */ 492 if (len && !avail && rqstp->rq_arg.page_len) { 493 avail = rqstp->rq_arg.page_len; 494 if (avail > PAGE_SIZE) avail = PAGE_SIZE; 495 old = page_address(rqstp->rq_arg.pages[0]); 496 } 497 while (len && avail && *old) { 498 *new++ = *old++; 499 len--; 500 avail--; 501 } 502 *new = '\0'; 503 if (len) 504 return 0; 505 506 return 1; 507 } 508 509 int 510 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p, 511 struct nfsd3_mknodargs *args) 512 { 513 if (!(p = decode_fh(p, &args->fh)) 514 || !(p = decode_filename(p, &args->name, &args->len))) 515 return 0; 516 517 args->ftype = ntohl(*p++); 518 519 if (args->ftype == NF3BLK || args->ftype == NF3CHR 520 || args->ftype == NF3SOCK || args->ftype == NF3FIFO) 521 p = decode_sattr3(p, &args->attrs); 522 523 if (args->ftype == NF3BLK || args->ftype == NF3CHR) { 524 args->major = ntohl(*p++); 525 args->minor = ntohl(*p++); 526 } 527 528 return xdr_argsize_check(rqstp, p); 529 } 530 531 int 532 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p, 533 struct nfsd3_renameargs *args) 534 { 535 if (!(p = decode_fh(p, &args->ffh)) 536 || !(p = decode_filename(p, &args->fname, &args->flen)) 537 || !(p = decode_fh(p, &args->tfh)) 538 || !(p = decode_filename(p, &args->tname, &args->tlen))) 539 return 0; 540 541 return xdr_argsize_check(rqstp, p); 542 } 543 544 int 545 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, 546 struct nfsd3_readlinkargs *args) 547 { 548 if (!(p = decode_fh(p, &args->fh))) 549 return 0; 550 args->buffer = 551 page_address(rqstp->rq_respages[rqstp->rq_resused++]); 552 553 return xdr_argsize_check(rqstp, p); 554 } 555 556 int 557 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p, 558 struct nfsd3_linkargs *args) 559 { 560 if (!(p = decode_fh(p, &args->ffh)) 561 || !(p = decode_fh(p, &args->tfh)) 562 || !(p = decode_filename(p, &args->tname, &args->tlen))) 563 return 0; 564 565 return xdr_argsize_check(rqstp, p); 566 } 567 568 int 569 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p, 570 struct nfsd3_readdirargs *args) 571 { 572 if (!(p = decode_fh(p, &args->fh))) 573 return 0; 574 p = xdr_decode_hyper(p, &args->cookie); 575 args->verf = p; p += 2; 576 args->dircount = ~0; 577 args->count = ntohl(*p++); 578 579 if (args->count > PAGE_SIZE) 580 args->count = PAGE_SIZE; 581 582 args->buffer = 583 page_address(rqstp->rq_respages[rqstp->rq_resused++]); 584 585 return xdr_argsize_check(rqstp, p); 586 } 587 588 int 589 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p, 590 struct nfsd3_readdirargs *args) 591 { 592 int len, pn; 593 u32 max_blocksize = svc_max_payload(rqstp); 594 595 if (!(p = decode_fh(p, &args->fh))) 596 return 0; 597 p = xdr_decode_hyper(p, &args->cookie); 598 args->verf = p; p += 2; 599 args->dircount = ntohl(*p++); 600 args->count = ntohl(*p++); 601 602 len = (args->count > max_blocksize) ? max_blocksize : 603 args->count; 604 args->count = len; 605 606 while (len > 0) { 607 pn = rqstp->rq_resused++; 608 if (!args->buffer) 609 args->buffer = page_address(rqstp->rq_respages[pn]); 610 len -= PAGE_SIZE; 611 } 612 613 return xdr_argsize_check(rqstp, p); 614 } 615 616 int 617 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p, 618 struct nfsd3_commitargs *args) 619 { 620 if (!(p = decode_fh(p, &args->fh))) 621 return 0; 622 p = xdr_decode_hyper(p, &args->offset); 623 args->count = ntohl(*p++); 624 625 return xdr_argsize_check(rqstp, p); 626 } 627 628 /* 629 * XDR encode functions 630 */ 631 /* 632 * There must be an encoding function for void results so svc_process 633 * will work properly. 634 */ 635 int 636 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy) 637 { 638 return xdr_ressize_check(rqstp, p); 639 } 640 641 /* GETATTR */ 642 int 643 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p, 644 struct nfsd3_attrstat *resp) 645 { 646 if (resp->status == 0) 647 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat); 648 return xdr_ressize_check(rqstp, p); 649 } 650 651 /* SETATTR, REMOVE, RMDIR */ 652 int 653 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p, 654 struct nfsd3_attrstat *resp) 655 { 656 p = encode_wcc_data(rqstp, p, &resp->fh); 657 return xdr_ressize_check(rqstp, p); 658 } 659 660 /* LOOKUP */ 661 int 662 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p, 663 struct nfsd3_diropres *resp) 664 { 665 if (resp->status == 0) { 666 p = encode_fh(p, &resp->fh); 667 p = encode_post_op_attr(rqstp, p, &resp->fh); 668 } 669 p = encode_post_op_attr(rqstp, p, &resp->dirfh); 670 return xdr_ressize_check(rqstp, p); 671 } 672 673 /* ACCESS */ 674 int 675 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p, 676 struct nfsd3_accessres *resp) 677 { 678 p = encode_post_op_attr(rqstp, p, &resp->fh); 679 if (resp->status == 0) 680 *p++ = htonl(resp->access); 681 return xdr_ressize_check(rqstp, p); 682 } 683 684 /* READLINK */ 685 int 686 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p, 687 struct nfsd3_readlinkres *resp) 688 { 689 p = encode_post_op_attr(rqstp, p, &resp->fh); 690 if (resp->status == 0) { 691 *p++ = htonl(resp->len); 692 xdr_ressize_check(rqstp, p); 693 rqstp->rq_res.page_len = resp->len; 694 if (resp->len & 3) { 695 /* need to pad the tail */ 696 rqstp->rq_res.tail[0].iov_base = p; 697 *p = 0; 698 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3); 699 } 700 return 1; 701 } else 702 return xdr_ressize_check(rqstp, p); 703 } 704 705 /* READ */ 706 int 707 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p, 708 struct nfsd3_readres *resp) 709 { 710 p = encode_post_op_attr(rqstp, p, &resp->fh); 711 if (resp->status == 0) { 712 *p++ = htonl(resp->count); 713 *p++ = htonl(resp->eof); 714 *p++ = htonl(resp->count); /* xdr opaque count */ 715 xdr_ressize_check(rqstp, p); 716 /* now update rqstp->rq_res to reflect data aswell */ 717 rqstp->rq_res.page_len = resp->count; 718 if (resp->count & 3) { 719 /* need to pad the tail */ 720 rqstp->rq_res.tail[0].iov_base = p; 721 *p = 0; 722 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3); 723 } 724 return 1; 725 } else 726 return xdr_ressize_check(rqstp, p); 727 } 728 729 /* WRITE */ 730 int 731 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p, 732 struct nfsd3_writeres *resp) 733 { 734 p = encode_wcc_data(rqstp, p, &resp->fh); 735 if (resp->status == 0) { 736 *p++ = htonl(resp->count); 737 *p++ = htonl(resp->committed); 738 *p++ = htonl(nfssvc_boot.tv_sec); 739 *p++ = htonl(nfssvc_boot.tv_usec); 740 } 741 return xdr_ressize_check(rqstp, p); 742 } 743 744 /* CREATE, MKDIR, SYMLINK, MKNOD */ 745 int 746 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p, 747 struct nfsd3_diropres *resp) 748 { 749 if (resp->status == 0) { 750 *p++ = xdr_one; 751 p = encode_fh(p, &resp->fh); 752 p = encode_post_op_attr(rqstp, p, &resp->fh); 753 } 754 p = encode_wcc_data(rqstp, p, &resp->dirfh); 755 return xdr_ressize_check(rqstp, p); 756 } 757 758 /* RENAME */ 759 int 760 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p, 761 struct nfsd3_renameres *resp) 762 { 763 p = encode_wcc_data(rqstp, p, &resp->ffh); 764 p = encode_wcc_data(rqstp, p, &resp->tfh); 765 return xdr_ressize_check(rqstp, p); 766 } 767 768 /* LINK */ 769 int 770 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p, 771 struct nfsd3_linkres *resp) 772 { 773 p = encode_post_op_attr(rqstp, p, &resp->fh); 774 p = encode_wcc_data(rqstp, p, &resp->tfh); 775 return xdr_ressize_check(rqstp, p); 776 } 777 778 /* READDIR */ 779 int 780 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p, 781 struct nfsd3_readdirres *resp) 782 { 783 p = encode_post_op_attr(rqstp, p, &resp->fh); 784 785 if (resp->status == 0) { 786 /* stupid readdir cookie */ 787 memcpy(p, resp->verf, 8); p += 2; 788 xdr_ressize_check(rqstp, p); 789 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE) 790 return 1; /*No room for trailer */ 791 rqstp->rq_res.page_len = (resp->count) << 2; 792 793 /* add the 'tail' to the end of the 'head' page - page 0. */ 794 rqstp->rq_res.tail[0].iov_base = p; 795 *p++ = 0; /* no more entries */ 796 *p++ = htonl(resp->common.err == nfserr_eof); 797 rqstp->rq_res.tail[0].iov_len = 2<<2; 798 return 1; 799 } else 800 return xdr_ressize_check(rqstp, p); 801 } 802 803 static __be32 * 804 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, 805 int namlen, ino_t ino) 806 { 807 *p++ = xdr_one; /* mark entry present */ 808 p = xdr_encode_hyper(p, ino); /* file id */ 809 p = xdr_encode_array(p, name, namlen);/* name length & name */ 810 811 cd->offset = p; /* remember pointer */ 812 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */ 813 814 return p; 815 } 816 817 static __be32 * 818 encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, 819 struct svc_fh *fhp) 820 { 821 p = encode_post_op_attr(cd->rqstp, p, fhp); 822 *p++ = xdr_one; /* yes, a file handle follows */ 823 p = encode_fh(p, fhp); 824 fh_put(fhp); 825 return p; 826 } 827 828 static int 829 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, 830 const char *name, int namlen) 831 { 832 struct svc_export *exp; 833 struct dentry *dparent, *dchild; 834 int rv = 0; 835 836 dparent = cd->fh.fh_dentry; 837 exp = cd->fh.fh_export; 838 839 fh_init(fhp, NFS3_FHSIZE); 840 if (isdotent(name, namlen)) { 841 if (namlen == 2) { 842 dchild = dget_parent(dparent); 843 if (dchild == dparent) { 844 /* filesystem root - cannot return filehandle for ".." */ 845 dput(dchild); 846 return 1; 847 } 848 } else 849 dchild = dget(dparent); 850 } else 851 dchild = lookup_one_len(name, dparent, namlen); 852 if (IS_ERR(dchild)) 853 return 1; 854 if (d_mountpoint(dchild) || 855 fh_compose(fhp, exp, dchild, &cd->fh) != 0 || 856 !dchild->d_inode) 857 rv = 1; 858 dput(dchild); 859 return rv; 860 } 861 862 /* 863 * Encode a directory entry. This one works for both normal readdir 864 * and readdirplus. 865 * The normal readdir reply requires 2 (fileid) + 1 (stringlen) 866 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen. 867 * 868 * The readdirplus baggage is 1+21 words for post_op_attr, plus the 869 * file handle. 870 */ 871 872 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1) 873 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2)) 874 static int 875 encode_entry(struct readdir_cd *ccd, const char *name, int namlen, 876 loff_t offset, ino_t ino, unsigned int d_type, int plus) 877 { 878 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres, 879 common); 880 __be32 *p = cd->buffer; 881 caddr_t curr_page_addr = NULL; 882 int pn; /* current page number */ 883 int slen; /* string (name) length */ 884 int elen; /* estimated entry length in words */ 885 int num_entry_words = 0; /* actual number of words */ 886 887 if (cd->offset) { 888 u64 offset64 = offset; 889 890 if (unlikely(cd->offset1)) { 891 /* we ended up with offset on a page boundary */ 892 *cd->offset = htonl(offset64 >> 32); 893 *cd->offset1 = htonl(offset64 & 0xffffffff); 894 cd->offset1 = NULL; 895 } else { 896 xdr_encode_hyper(cd->offset, offset64); 897 } 898 } 899 900 /* 901 dprintk("encode_entry(%.*s @%ld%s)\n", 902 namlen, name, (long) offset, plus? " plus" : ""); 903 */ 904 905 /* truncate filename if too long */ 906 if (namlen > NFS3_MAXNAMLEN) 907 namlen = NFS3_MAXNAMLEN; 908 909 slen = XDR_QUADLEN(namlen); 910 elen = slen + NFS3_ENTRY_BAGGAGE 911 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0); 912 913 if (cd->buflen < elen) { 914 cd->common.err = nfserr_toosmall; 915 return -EINVAL; 916 } 917 918 /* determine which page in rq_respages[] we are currently filling */ 919 for (pn=1; pn < cd->rqstp->rq_resused; pn++) { 920 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]); 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 /* throw in readdirplus baggage */ 933 if (plus) { 934 struct svc_fh fh; 935 936 if (compose_entry_fh(cd, &fh, name, namlen) > 0) { 937 *p++ = 0; 938 *p++ = 0; 939 } else 940 p = encode_entryplus_baggage(cd, p, &fh); 941 } 942 num_entry_words = p - cd->buffer; 943 } else if (cd->rqstp->rq_respages[pn+1] != NULL) { 944 /* temporarily encode entry into next page, then move back to 945 * current and next page in rq_respages[] */ 946 __be32 *p1, *tmp; 947 int len1, len2; 948 949 /* grab next page for temporary storage of entry */ 950 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]); 951 952 p1 = encode_entry_baggage(cd, p1, name, namlen, ino); 953 954 /* throw in readdirplus baggage */ 955 if (plus) { 956 struct svc_fh fh; 957 958 if (compose_entry_fh(cd, &fh, name, namlen) > 0) { 959 /* zero out the filehandle */ 960 *p1++ = 0; 961 *p1++ = 0; 962 } else 963 p1 = encode_entryplus_baggage(cd, p1, &fh); 964 } 965 966 /* determine entry word length and lengths to go in pages */ 967 num_entry_words = p1 - tmp; 968 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer; 969 if ((num_entry_words << 2) < len1) { 970 /* the actual number of words in the entry is less 971 * than elen and can still fit in the current page 972 */ 973 memmove(p, tmp, num_entry_words << 2); 974 p += num_entry_words; 975 976 /* update offset */ 977 cd->offset = cd->buffer + (cd->offset - tmp); 978 } else { 979 unsigned int offset_r = (cd->offset - tmp) << 2; 980 981 /* update pointer to offset location. 982 * This is a 64bit quantity, so we need to 983 * deal with 3 cases: 984 * - entirely in first page 985 * - entirely in second page 986 * - 4 bytes in each page 987 */ 988 if (offset_r + 8 <= len1) { 989 cd->offset = p + (cd->offset - tmp); 990 } else if (offset_r >= len1) { 991 cd->offset -= len1 >> 2; 992 } else { 993 /* sitting on the fence */ 994 BUG_ON(offset_r != len1 - 4); 995 cd->offset = p + (cd->offset - tmp); 996 cd->offset1 = tmp; 997 } 998 999 len2 = (num_entry_words << 2) - len1; 1000 1001 /* move from temp page to current and next pages */ 1002 memmove(p, tmp, len1); 1003 memmove(tmp, (caddr_t)tmp+len1, len2); 1004 1005 p = tmp + (len2 >> 2); 1006 } 1007 } 1008 else { 1009 cd->common.err = nfserr_toosmall; 1010 return -EINVAL; 1011 } 1012 1013 cd->buflen -= num_entry_words; 1014 cd->buffer = p; 1015 cd->common.err = nfs_ok; 1016 return 0; 1017 1018 } 1019 1020 int 1021 nfs3svc_encode_entry(void *cd, const char *name, 1022 int namlen, loff_t offset, u64 ino, unsigned int d_type) 1023 { 1024 return encode_entry(cd, name, namlen, offset, ino, d_type, 0); 1025 } 1026 1027 int 1028 nfs3svc_encode_entry_plus(void *cd, const char *name, 1029 int namlen, loff_t offset, u64 ino, 1030 unsigned int d_type) 1031 { 1032 return encode_entry(cd, name, namlen, offset, ino, d_type, 1); 1033 } 1034 1035 /* FSSTAT */ 1036 int 1037 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p, 1038 struct nfsd3_fsstatres *resp) 1039 { 1040 struct kstatfs *s = &resp->stats; 1041 u64 bs = s->f_bsize; 1042 1043 *p++ = xdr_zero; /* no post_op_attr */ 1044 1045 if (resp->status == 0) { 1046 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */ 1047 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */ 1048 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */ 1049 p = xdr_encode_hyper(p, s->f_files); /* total inodes */ 1050 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */ 1051 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */ 1052 *p++ = htonl(resp->invarsec); /* mean unchanged time */ 1053 } 1054 return xdr_ressize_check(rqstp, p); 1055 } 1056 1057 /* FSINFO */ 1058 int 1059 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p, 1060 struct nfsd3_fsinfores *resp) 1061 { 1062 *p++ = xdr_zero; /* no post_op_attr */ 1063 1064 if (resp->status == 0) { 1065 *p++ = htonl(resp->f_rtmax); 1066 *p++ = htonl(resp->f_rtpref); 1067 *p++ = htonl(resp->f_rtmult); 1068 *p++ = htonl(resp->f_wtmax); 1069 *p++ = htonl(resp->f_wtpref); 1070 *p++ = htonl(resp->f_wtmult); 1071 *p++ = htonl(resp->f_dtpref); 1072 p = xdr_encode_hyper(p, resp->f_maxfilesize); 1073 *p++ = xdr_one; 1074 *p++ = xdr_zero; 1075 *p++ = htonl(resp->f_properties); 1076 } 1077 1078 return xdr_ressize_check(rqstp, p); 1079 } 1080 1081 /* PATHCONF */ 1082 int 1083 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p, 1084 struct nfsd3_pathconfres *resp) 1085 { 1086 *p++ = xdr_zero; /* no post_op_attr */ 1087 1088 if (resp->status == 0) { 1089 *p++ = htonl(resp->p_link_max); 1090 *p++ = htonl(resp->p_name_max); 1091 *p++ = htonl(resp->p_no_trunc); 1092 *p++ = htonl(resp->p_chown_restricted); 1093 *p++ = htonl(resp->p_case_insensitive); 1094 *p++ = htonl(resp->p_case_preserving); 1095 } 1096 1097 return xdr_ressize_check(rqstp, p); 1098 } 1099 1100 /* COMMIT */ 1101 int 1102 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p, 1103 struct nfsd3_commitres *resp) 1104 { 1105 p = encode_wcc_data(rqstp, p, &resp->fh); 1106 /* Write verifier */ 1107 if (resp->status == 0) { 1108 *p++ = htonl(nfssvc_boot.tv_sec); 1109 *p++ = htonl(nfssvc_boot.tv_usec); 1110 } 1111 return xdr_ressize_check(rqstp, p); 1112 } 1113 1114 /* 1115 * XDR release functions 1116 */ 1117 int 1118 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p, 1119 struct nfsd3_attrstat *resp) 1120 { 1121 fh_put(&resp->fh); 1122 return 1; 1123 } 1124 1125 int 1126 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p, 1127 struct nfsd3_fhandle_pair *resp) 1128 { 1129 fh_put(&resp->fh1); 1130 fh_put(&resp->fh2); 1131 return 1; 1132 } 1133