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 != NULL) { 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 || !(p = decode_sattr3(p, &args->attrs))) 305 return 0; 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 || !(p = xdr_decode_hyper(p, &args->offset))) 348 return 0; 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; 373 u32 max_blocksize = svc_max_payload(rqstp); 374 375 if (!(p = decode_fh(p, &args->fh)) 376 || !(p = xdr_decode_hyper(p, &args->offset))) 377 return 0; 378 379 args->count = ntohl(*p++); 380 args->stable = ntohl(*p++); 381 len = args->len = ntohl(*p++); 382 383 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base; 384 if (rqstp->rq_arg.len < hdr || 385 rqstp->rq_arg.len - hdr < len) 386 return 0; 387 388 rqstp->rq_vec[0].iov_base = (void*)p; 389 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr; 390 391 if (len > max_blocksize) 392 len = max_blocksize; 393 v= 0; 394 while (len > rqstp->rq_vec[v].iov_len) { 395 len -= rqstp->rq_vec[v].iov_len; 396 v++; 397 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]); 398 rqstp->rq_vec[v].iov_len = PAGE_SIZE; 399 } 400 rqstp->rq_vec[v].iov_len = len; 401 args->vlen = v+1; 402 403 return args->count == args->len && rqstp->rq_vec[0].iov_len > 0; 404 } 405 406 int 407 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p, 408 struct nfsd3_createargs *args) 409 { 410 if (!(p = decode_fh(p, &args->fh)) 411 || !(p = decode_filename(p, &args->name, &args->len))) 412 return 0; 413 414 switch (args->createmode = ntohl(*p++)) { 415 case NFS3_CREATE_UNCHECKED: 416 case NFS3_CREATE_GUARDED: 417 if (!(p = decode_sattr3(p, &args->attrs))) 418 return 0; 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 || !(p = decode_sattr3(p, &args->attrs))) 437 return 0; 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; 447 int avail; 448 char *old, *new; 449 struct kvec *vec; 450 451 if (!(p = decode_fh(p, &args->ffh)) 452 || !(p = decode_filename(p, &args->fname, &args->flen)) 453 || !(p = decode_sattr3(p, &args->attrs)) 454 ) 455 return 0; 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) avail = PAGE_SIZE; 480 old = page_address(rqstp->rq_arg.pages[0]); 481 } 482 while (len && avail && *old) { 483 *new++ = *old++; 484 len--; 485 avail--; 486 } 487 *new = '\0'; 488 if (len) 489 return 0; 490 491 return 1; 492 } 493 494 int 495 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p, 496 struct nfsd3_mknodargs *args) 497 { 498 if (!(p = decode_fh(p, &args->fh)) 499 || !(p = decode_filename(p, &args->name, &args->len))) 500 return 0; 501 502 args->ftype = ntohl(*p++); 503 504 if (args->ftype == NF3BLK || args->ftype == NF3CHR 505 || args->ftype == NF3SOCK || args->ftype == NF3FIFO) { 506 if (!(p = decode_sattr3(p, &args->attrs))) 507 return 0; 508 } 509 510 if (args->ftype == NF3BLK || args->ftype == NF3CHR) { 511 args->major = ntohl(*p++); 512 args->minor = ntohl(*p++); 513 } 514 515 return xdr_argsize_check(rqstp, p); 516 } 517 518 int 519 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p, 520 struct nfsd3_renameargs *args) 521 { 522 if (!(p = decode_fh(p, &args->ffh)) 523 || !(p = decode_filename(p, &args->fname, &args->flen)) 524 || !(p = decode_fh(p, &args->tfh)) 525 || !(p = decode_filename(p, &args->tname, &args->tlen))) 526 return 0; 527 528 return xdr_argsize_check(rqstp, p); 529 } 530 531 int 532 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, 533 struct nfsd3_readlinkargs *args) 534 { 535 if (!(p = decode_fh(p, &args->fh))) 536 return 0; 537 args->buffer = 538 page_address(rqstp->rq_respages[rqstp->rq_resused++]); 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 = 570 page_address(rqstp->rq_respages[rqstp->rq_resused++]); 571 572 return xdr_argsize_check(rqstp, p); 573 } 574 575 int 576 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p, 577 struct nfsd3_readdirargs *args) 578 { 579 int len, pn; 580 u32 max_blocksize = svc_max_payload(rqstp); 581 582 if (!(p = decode_fh(p, &args->fh))) 583 return 0; 584 p = xdr_decode_hyper(p, &args->cookie); 585 args->verf = p; p += 2; 586 args->dircount = ntohl(*p++); 587 args->count = ntohl(*p++); 588 589 len = (args->count > max_blocksize) ? max_blocksize : 590 args->count; 591 args->count = len; 592 593 while (len > 0) { 594 pn = rqstp->rq_resused++; 595 if (!args->buffer) 596 args->buffer = page_address(rqstp->rq_respages[pn]); 597 len -= PAGE_SIZE; 598 } 599 600 return xdr_argsize_check(rqstp, p); 601 } 602 603 int 604 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p, 605 struct nfsd3_commitargs *args) 606 { 607 if (!(p = decode_fh(p, &args->fh))) 608 return 0; 609 p = xdr_decode_hyper(p, &args->offset); 610 args->count = ntohl(*p++); 611 612 return xdr_argsize_check(rqstp, p); 613 } 614 615 /* 616 * XDR encode functions 617 */ 618 /* 619 * There must be an encoding function for void results so svc_process 620 * will work properly. 621 */ 622 int 623 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy) 624 { 625 return xdr_ressize_check(rqstp, p); 626 } 627 628 /* GETATTR */ 629 int 630 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p, 631 struct nfsd3_attrstat *resp) 632 { 633 if (resp->status == 0) 634 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat); 635 return xdr_ressize_check(rqstp, p); 636 } 637 638 /* SETATTR, REMOVE, RMDIR */ 639 int 640 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p, 641 struct nfsd3_attrstat *resp) 642 { 643 p = encode_wcc_data(rqstp, p, &resp->fh); 644 return xdr_ressize_check(rqstp, p); 645 } 646 647 /* LOOKUP */ 648 int 649 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p, 650 struct nfsd3_diropres *resp) 651 { 652 if (resp->status == 0) { 653 p = encode_fh(p, &resp->fh); 654 p = encode_post_op_attr(rqstp, p, &resp->fh); 655 } 656 p = encode_post_op_attr(rqstp, p, &resp->dirfh); 657 return xdr_ressize_check(rqstp, p); 658 } 659 660 /* ACCESS */ 661 int 662 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p, 663 struct nfsd3_accessres *resp) 664 { 665 p = encode_post_op_attr(rqstp, p, &resp->fh); 666 if (resp->status == 0) 667 *p++ = htonl(resp->access); 668 return xdr_ressize_check(rqstp, p); 669 } 670 671 /* READLINK */ 672 int 673 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p, 674 struct nfsd3_readlinkres *resp) 675 { 676 p = encode_post_op_attr(rqstp, p, &resp->fh); 677 if (resp->status == 0) { 678 *p++ = htonl(resp->len); 679 xdr_ressize_check(rqstp, p); 680 rqstp->rq_res.page_len = resp->len; 681 if (resp->len & 3) { 682 /* need to pad the tail */ 683 rqstp->rq_res.tail[0].iov_base = p; 684 *p = 0; 685 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3); 686 } 687 return 1; 688 } else 689 return xdr_ressize_check(rqstp, p); 690 } 691 692 /* READ */ 693 int 694 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p, 695 struct nfsd3_readres *resp) 696 { 697 p = encode_post_op_attr(rqstp, p, &resp->fh); 698 if (resp->status == 0) { 699 *p++ = htonl(resp->count); 700 *p++ = htonl(resp->eof); 701 *p++ = htonl(resp->count); /* xdr opaque count */ 702 xdr_ressize_check(rqstp, p); 703 /* now update rqstp->rq_res to reflect data aswell */ 704 rqstp->rq_res.page_len = resp->count; 705 if (resp->count & 3) { 706 /* need to pad the tail */ 707 rqstp->rq_res.tail[0].iov_base = p; 708 *p = 0; 709 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3); 710 } 711 return 1; 712 } else 713 return xdr_ressize_check(rqstp, p); 714 } 715 716 /* WRITE */ 717 int 718 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p, 719 struct nfsd3_writeres *resp) 720 { 721 p = encode_wcc_data(rqstp, p, &resp->fh); 722 if (resp->status == 0) { 723 *p++ = htonl(resp->count); 724 *p++ = htonl(resp->committed); 725 *p++ = htonl(nfssvc_boot.tv_sec); 726 *p++ = htonl(nfssvc_boot.tv_usec); 727 } 728 return xdr_ressize_check(rqstp, p); 729 } 730 731 /* CREATE, MKDIR, SYMLINK, MKNOD */ 732 int 733 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p, 734 struct nfsd3_diropres *resp) 735 { 736 if (resp->status == 0) { 737 *p++ = xdr_one; 738 p = encode_fh(p, &resp->fh); 739 p = encode_post_op_attr(rqstp, p, &resp->fh); 740 } 741 p = encode_wcc_data(rqstp, p, &resp->dirfh); 742 return xdr_ressize_check(rqstp, p); 743 } 744 745 /* RENAME */ 746 int 747 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p, 748 struct nfsd3_renameres *resp) 749 { 750 p = encode_wcc_data(rqstp, p, &resp->ffh); 751 p = encode_wcc_data(rqstp, p, &resp->tfh); 752 return xdr_ressize_check(rqstp, p); 753 } 754 755 /* LINK */ 756 int 757 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p, 758 struct nfsd3_linkres *resp) 759 { 760 p = encode_post_op_attr(rqstp, p, &resp->fh); 761 p = encode_wcc_data(rqstp, p, &resp->tfh); 762 return xdr_ressize_check(rqstp, p); 763 } 764 765 /* READDIR */ 766 int 767 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p, 768 struct nfsd3_readdirres *resp) 769 { 770 p = encode_post_op_attr(rqstp, p, &resp->fh); 771 772 if (resp->status == 0) { 773 /* stupid readdir cookie */ 774 memcpy(p, resp->verf, 8); p += 2; 775 xdr_ressize_check(rqstp, p); 776 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE) 777 return 1; /*No room for trailer */ 778 rqstp->rq_res.page_len = (resp->count) << 2; 779 780 /* add the 'tail' to the end of the 'head' page - page 0. */ 781 rqstp->rq_res.tail[0].iov_base = p; 782 *p++ = 0; /* no more entries */ 783 *p++ = htonl(resp->common.err == nfserr_eof); 784 rqstp->rq_res.tail[0].iov_len = 2<<2; 785 return 1; 786 } else 787 return xdr_ressize_check(rqstp, p); 788 } 789 790 static __be32 * 791 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, 792 int namlen, ino_t ino) 793 { 794 *p++ = xdr_one; /* mark entry present */ 795 p = xdr_encode_hyper(p, ino); /* file id */ 796 p = xdr_encode_array(p, name, namlen);/* name length & name */ 797 798 cd->offset = p; /* remember pointer */ 799 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */ 800 801 return p; 802 } 803 804 static __be32 * 805 encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, 806 struct svc_fh *fhp) 807 { 808 p = encode_post_op_attr(cd->rqstp, p, fhp); 809 *p++ = xdr_one; /* yes, a file handle follows */ 810 p = encode_fh(p, fhp); 811 fh_put(fhp); 812 return p; 813 } 814 815 static int 816 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, 817 const char *name, int namlen) 818 { 819 struct svc_export *exp; 820 struct dentry *dparent, *dchild; 821 int rv = 0; 822 823 dparent = cd->fh.fh_dentry; 824 exp = cd->fh.fh_export; 825 826 fh_init(fhp, NFS3_FHSIZE); 827 if (isdotent(name, namlen)) { 828 if (namlen == 2) { 829 dchild = dget_parent(dparent); 830 if (dchild == dparent) { 831 /* filesystem root - cannot return filehandle for ".." */ 832 dput(dchild); 833 return 1; 834 } 835 } else 836 dchild = dget(dparent); 837 } else 838 dchild = lookup_one_len(name, dparent, namlen); 839 if (IS_ERR(dchild)) 840 return 1; 841 if (d_mountpoint(dchild) || 842 fh_compose(fhp, exp, dchild, &cd->fh) != 0 || 843 !dchild->d_inode) 844 rv = 1; 845 dput(dchild); 846 return rv; 847 } 848 849 /* 850 * Encode a directory entry. This one works for both normal readdir 851 * and readdirplus. 852 * The normal readdir reply requires 2 (fileid) + 1 (stringlen) 853 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen. 854 * 855 * The readdirplus baggage is 1+21 words for post_op_attr, plus the 856 * file handle. 857 */ 858 859 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1) 860 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2)) 861 static int 862 encode_entry(struct readdir_cd *ccd, const char *name, 863 int namlen, off_t offset, ino_t ino, unsigned int d_type, int plus) 864 { 865 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres, 866 common); 867 __be32 *p = cd->buffer; 868 caddr_t curr_page_addr = NULL; 869 int pn; /* current page number */ 870 int slen; /* string (name) length */ 871 int elen; /* estimated entry length in words */ 872 int num_entry_words = 0; /* actual number of words */ 873 874 if (cd->offset) { 875 u64 offset64 = offset; 876 877 if (unlikely(cd->offset1)) { 878 /* we ended up with offset on a page boundary */ 879 *cd->offset = htonl(offset64 >> 32); 880 *cd->offset1 = htonl(offset64 & 0xffffffff); 881 cd->offset1 = NULL; 882 } else { 883 xdr_encode_hyper(cd->offset, (u64) offset); 884 } 885 } 886 887 /* 888 dprintk("encode_entry(%.*s @%ld%s)\n", 889 namlen, name, (long) offset, plus? " plus" : ""); 890 */ 891 892 /* truncate filename if too long */ 893 if (namlen > NFS3_MAXNAMLEN) 894 namlen = NFS3_MAXNAMLEN; 895 896 slen = XDR_QUADLEN(namlen); 897 elen = slen + NFS3_ENTRY_BAGGAGE 898 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0); 899 900 if (cd->buflen < elen) { 901 cd->common.err = nfserr_toosmall; 902 return -EINVAL; 903 } 904 905 /* determine which page in rq_respages[] we are currently filling */ 906 for (pn=1; pn < cd->rqstp->rq_resused; pn++) { 907 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]); 908 909 if (((caddr_t)cd->buffer >= curr_page_addr) && 910 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE)) 911 break; 912 } 913 914 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) { 915 /* encode entry in current page */ 916 917 p = encode_entry_baggage(cd, p, name, namlen, ino); 918 919 /* throw in readdirplus baggage */ 920 if (plus) { 921 struct svc_fh fh; 922 923 if (compose_entry_fh(cd, &fh, name, namlen) > 0) { 924 *p++ = 0; 925 *p++ = 0; 926 } else 927 p = encode_entryplus_baggage(cd, p, &fh); 928 } 929 num_entry_words = p - cd->buffer; 930 } else if (cd->rqstp->rq_respages[pn+1] != NULL) { 931 /* temporarily encode entry into next page, then move back to 932 * current and next page in rq_respages[] */ 933 __be32 *p1, *tmp; 934 int len1, len2; 935 936 /* grab next page for temporary storage of entry */ 937 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]); 938 939 p1 = encode_entry_baggage(cd, p1, name, namlen, ino); 940 941 /* throw in readdirplus baggage */ 942 if (plus) { 943 struct svc_fh fh; 944 945 if (compose_entry_fh(cd, &fh, name, namlen) > 0) { 946 /* zero out the filehandle */ 947 *p1++ = 0; 948 *p1++ = 0; 949 } else 950 p1 = encode_entryplus_baggage(cd, p1, &fh); 951 } 952 953 /* determine entry word length and lengths to go in pages */ 954 num_entry_words = p1 - tmp; 955 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer; 956 if ((num_entry_words << 2) < len1) { 957 /* the actual number of words in the entry is less 958 * than elen and can still fit in the current page 959 */ 960 memmove(p, tmp, num_entry_words << 2); 961 p += num_entry_words; 962 963 /* update offset */ 964 cd->offset = cd->buffer + (cd->offset - tmp); 965 } else { 966 unsigned int offset_r = (cd->offset - tmp) << 2; 967 968 /* update pointer to offset location. 969 * This is a 64bit quantity, so we need to 970 * deal with 3 cases: 971 * - entirely in first page 972 * - entirely in second page 973 * - 4 bytes in each page 974 */ 975 if (offset_r + 8 <= len1) { 976 cd->offset = p + (cd->offset - tmp); 977 } else if (offset_r >= len1) { 978 cd->offset -= len1 >> 2; 979 } else { 980 /* sitting on the fence */ 981 BUG_ON(offset_r != len1 - 4); 982 cd->offset = p + (cd->offset - tmp); 983 cd->offset1 = tmp; 984 } 985 986 len2 = (num_entry_words << 2) - len1; 987 988 /* move from temp page to current and next pages */ 989 memmove(p, tmp, len1); 990 memmove(tmp, (caddr_t)tmp+len1, len2); 991 992 p = tmp + (len2 >> 2); 993 } 994 } 995 else { 996 cd->common.err = nfserr_toosmall; 997 return -EINVAL; 998 } 999 1000 cd->buflen -= num_entry_words; 1001 cd->buffer = p; 1002 cd->common.err = nfs_ok; 1003 return 0; 1004 1005 } 1006 1007 int 1008 nfs3svc_encode_entry(void *cd, const char *name, 1009 int namlen, loff_t offset, u64 ino, unsigned int d_type) 1010 { 1011 return encode_entry(cd, name, namlen, offset, ino, d_type, 0); 1012 } 1013 1014 int 1015 nfs3svc_encode_entry_plus(void *cd, const char *name, 1016 int namlen, loff_t offset, u64 ino, 1017 unsigned int d_type) 1018 { 1019 return encode_entry(cd, name, namlen, offset, ino, d_type, 1); 1020 } 1021 1022 /* FSSTAT */ 1023 int 1024 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p, 1025 struct nfsd3_fsstatres *resp) 1026 { 1027 struct kstatfs *s = &resp->stats; 1028 u64 bs = s->f_bsize; 1029 1030 *p++ = xdr_zero; /* no post_op_attr */ 1031 1032 if (resp->status == 0) { 1033 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */ 1034 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */ 1035 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */ 1036 p = xdr_encode_hyper(p, s->f_files); /* total inodes */ 1037 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */ 1038 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */ 1039 *p++ = htonl(resp->invarsec); /* mean unchanged time */ 1040 } 1041 return xdr_ressize_check(rqstp, p); 1042 } 1043 1044 /* FSINFO */ 1045 int 1046 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p, 1047 struct nfsd3_fsinfores *resp) 1048 { 1049 *p++ = xdr_zero; /* no post_op_attr */ 1050 1051 if (resp->status == 0) { 1052 *p++ = htonl(resp->f_rtmax); 1053 *p++ = htonl(resp->f_rtpref); 1054 *p++ = htonl(resp->f_rtmult); 1055 *p++ = htonl(resp->f_wtmax); 1056 *p++ = htonl(resp->f_wtpref); 1057 *p++ = htonl(resp->f_wtmult); 1058 *p++ = htonl(resp->f_dtpref); 1059 p = xdr_encode_hyper(p, resp->f_maxfilesize); 1060 *p++ = xdr_one; 1061 *p++ = xdr_zero; 1062 *p++ = htonl(resp->f_properties); 1063 } 1064 1065 return xdr_ressize_check(rqstp, p); 1066 } 1067 1068 /* PATHCONF */ 1069 int 1070 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p, 1071 struct nfsd3_pathconfres *resp) 1072 { 1073 *p++ = xdr_zero; /* no post_op_attr */ 1074 1075 if (resp->status == 0) { 1076 *p++ = htonl(resp->p_link_max); 1077 *p++ = htonl(resp->p_name_max); 1078 *p++ = htonl(resp->p_no_trunc); 1079 *p++ = htonl(resp->p_chown_restricted); 1080 *p++ = htonl(resp->p_case_insensitive); 1081 *p++ = htonl(resp->p_case_preserving); 1082 } 1083 1084 return xdr_ressize_check(rqstp, p); 1085 } 1086 1087 /* COMMIT */ 1088 int 1089 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p, 1090 struct nfsd3_commitres *resp) 1091 { 1092 p = encode_wcc_data(rqstp, p, &resp->fh); 1093 /* Write verifier */ 1094 if (resp->status == 0) { 1095 *p++ = htonl(nfssvc_boot.tv_sec); 1096 *p++ = htonl(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