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 #include "auth.h" 25 26 #define NFSDDBG_FACILITY NFSDDBG_XDR 27 28 29 /* 30 * Mapping of S_IF* types to NFS file types 31 */ 32 static u32 nfs3_ftypes[] = { 33 NF3NON, NF3FIFO, NF3CHR, NF3BAD, 34 NF3DIR, NF3BAD, NF3BLK, NF3BAD, 35 NF3REG, NF3BAD, NF3LNK, NF3BAD, 36 NF3SOCK, NF3BAD, NF3LNK, NF3BAD, 37 }; 38 39 /* 40 * XDR functions for basic NFS types 41 */ 42 static __be32 * 43 encode_time3(__be32 *p, struct timespec *time) 44 { 45 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec); 46 return p; 47 } 48 49 static __be32 * 50 decode_time3(__be32 *p, struct timespec *time) 51 { 52 time->tv_sec = ntohl(*p++); 53 time->tv_nsec = ntohl(*p++); 54 return p; 55 } 56 57 static __be32 * 58 decode_fh(__be32 *p, struct svc_fh *fhp) 59 { 60 unsigned int size; 61 fh_init(fhp, NFS3_FHSIZE); 62 size = ntohl(*p++); 63 if (size > NFS3_FHSIZE) 64 return NULL; 65 66 memcpy(&fhp->fh_handle.fh_base, p, size); 67 fhp->fh_handle.fh_size = size; 68 return p + XDR_QUADLEN(size); 69 } 70 71 /* Helper function for NFSv3 ACL code */ 72 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp) 73 { 74 return decode_fh(p, fhp); 75 } 76 77 static __be32 * 78 encode_fh(__be32 *p, struct svc_fh *fhp) 79 { 80 unsigned int size = fhp->fh_handle.fh_size; 81 *p++ = htonl(size); 82 if (size) p[XDR_QUADLEN(size)-1]=0; 83 memcpy(p, &fhp->fh_handle.fh_base, size); 84 return p + XDR_QUADLEN(size); 85 } 86 87 /* 88 * Decode a file name and make sure that the path contains 89 * no slashes or null bytes. 90 */ 91 static __be32 * 92 decode_filename(__be32 *p, char **namp, unsigned int *lenp) 93 { 94 char *name; 95 unsigned int i; 96 97 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) { 98 for (i = 0, name = *namp; i < *lenp; i++, name++) { 99 if (*name == '\0' || *name == '/') 100 return NULL; 101 } 102 } 103 104 return p; 105 } 106 107 static __be32 * 108 decode_sattr3(__be32 *p, struct iattr *iap) 109 { 110 u32 tmp; 111 112 iap->ia_valid = 0; 113 114 if (*p++) { 115 iap->ia_valid |= ATTR_MODE; 116 iap->ia_mode = ntohl(*p++); 117 } 118 if (*p++) { 119 iap->ia_valid |= ATTR_UID; 120 iap->ia_uid = ntohl(*p++); 121 } 122 if (*p++) { 123 iap->ia_valid |= ATTR_GID; 124 iap->ia_gid = ntohl(*p++); 125 } 126 if (*p++) { 127 u64 newsize; 128 129 iap->ia_valid |= ATTR_SIZE; 130 p = xdr_decode_hyper(p, &newsize); 131 if (newsize <= NFS_OFFSET_MAX) 132 iap->ia_size = newsize; 133 else 134 iap->ia_size = NFS_OFFSET_MAX; 135 } 136 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ 137 iap->ia_valid |= ATTR_ATIME; 138 } else if (tmp == 2) { /* set to client time */ 139 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; 140 iap->ia_atime.tv_sec = ntohl(*p++); 141 iap->ia_atime.tv_nsec = ntohl(*p++); 142 } 143 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ 144 iap->ia_valid |= ATTR_MTIME; 145 } else if (tmp == 2) { /* set to client time */ 146 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; 147 iap->ia_mtime.tv_sec = ntohl(*p++); 148 iap->ia_mtime.tv_nsec = ntohl(*p++); 149 } 150 return p; 151 } 152 153 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp) 154 { 155 u64 f; 156 switch(fsid_source(fhp)) { 157 default: 158 case FSIDSOURCE_DEV: 159 p = xdr_encode_hyper(p, (u64)huge_encode_dev 160 (fhp->fh_dentry->d_inode->i_sb->s_dev)); 161 break; 162 case FSIDSOURCE_FSID: 163 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); 164 break; 165 case FSIDSOURCE_UUID: 166 f = ((u64*)fhp->fh_export->ex_uuid)[0]; 167 f ^= ((u64*)fhp->fh_export->ex_uuid)[1]; 168 p = xdr_encode_hyper(p, f); 169 break; 170 } 171 return p; 172 } 173 174 static __be32 * 175 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, 176 struct kstat *stat) 177 { 178 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]); 179 *p++ = htonl((u32) stat->mode); 180 *p++ = htonl((u32) stat->nlink); 181 *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid)); 182 *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid)); 183 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) { 184 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); 185 } else { 186 p = xdr_encode_hyper(p, (u64) stat->size); 187 } 188 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9); 189 *p++ = htonl((u32) MAJOR(stat->rdev)); 190 *p++ = htonl((u32) MINOR(stat->rdev)); 191 p = encode_fsid(p, fhp); 192 p = xdr_encode_hyper(p, stat->ino); 193 p = encode_time3(p, &stat->atime); 194 p = encode_time3(p, &stat->mtime); 195 p = encode_time3(p, &stat->ctime); 196 197 return p; 198 } 199 200 static __be32 * 201 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 202 { 203 /* Attributes to follow */ 204 *p++ = xdr_one; 205 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr); 206 } 207 208 /* 209 * Encode post-operation attributes. 210 * The inode may be NULL if the call failed because of a stale file 211 * handle. In this case, no attributes are returned. 212 */ 213 static __be32 * 214 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 215 { 216 struct dentry *dentry = fhp->fh_dentry; 217 if (dentry && dentry->d_inode) { 218 int err; 219 struct kstat stat; 220 221 err = vfs_getattr(fhp->fh_export->ex_path.mnt, dentry, &stat); 222 if (!err) { 223 *p++ = xdr_one; /* attributes follow */ 224 lease_get_mtime(dentry->d_inode, &stat.mtime); 225 return encode_fattr3(rqstp, p, fhp, &stat); 226 } 227 } 228 *p++ = xdr_zero; 229 return p; 230 } 231 232 /* Helper for NFSv3 ACLs */ 233 __be32 * 234 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 235 { 236 return encode_post_op_attr(rqstp, p, fhp); 237 } 238 239 /* 240 * Enocde weak cache consistency data 241 */ 242 static __be32 * 243 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 244 { 245 struct dentry *dentry = fhp->fh_dentry; 246 247 if (dentry && dentry->d_inode && fhp->fh_post_saved) { 248 if (fhp->fh_pre_saved) { 249 *p++ = xdr_one; 250 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size); 251 p = encode_time3(p, &fhp->fh_pre_mtime); 252 p = encode_time3(p, &fhp->fh_pre_ctime); 253 } else { 254 *p++ = xdr_zero; 255 } 256 return encode_saved_post_attr(rqstp, p, fhp); 257 } 258 /* no pre- or post-attrs */ 259 *p++ = xdr_zero; 260 return encode_post_op_attr(rqstp, p, fhp); 261 } 262 263 /* 264 * Fill in the post_op attr for the wcc data 265 */ 266 void fill_post_wcc(struct svc_fh *fhp) 267 { 268 int err; 269 270 if (fhp->fh_post_saved) 271 printk("nfsd: inode locked twice during operation.\n"); 272 273 err = vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry, 274 &fhp->fh_post_attr); 275 if (err) 276 fhp->fh_post_saved = 0; 277 else 278 fhp->fh_post_saved = 1; 279 } 280 281 /* 282 * XDR decode functions 283 */ 284 int 285 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args) 286 { 287 if (!(p = decode_fh(p, &args->fh))) 288 return 0; 289 return xdr_argsize_check(rqstp, p); 290 } 291 292 int 293 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p, 294 struct nfsd3_sattrargs *args) 295 { 296 if (!(p = decode_fh(p, &args->fh))) 297 return 0; 298 p = decode_sattr3(p, &args->attrs); 299 300 if ((args->check_guard = ntohl(*p++)) != 0) { 301 struct timespec time; 302 p = decode_time3(p, &time); 303 args->guardtime = time.tv_sec; 304 } 305 306 return xdr_argsize_check(rqstp, p); 307 } 308 309 int 310 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p, 311 struct nfsd3_diropargs *args) 312 { 313 if (!(p = decode_fh(p, &args->fh)) 314 || !(p = decode_filename(p, &args->name, &args->len))) 315 return 0; 316 317 return xdr_argsize_check(rqstp, p); 318 } 319 320 int 321 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p, 322 struct nfsd3_accessargs *args) 323 { 324 if (!(p = decode_fh(p, &args->fh))) 325 return 0; 326 args->access = ntohl(*p++); 327 328 return xdr_argsize_check(rqstp, p); 329 } 330 331 int 332 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p, 333 struct nfsd3_readargs *args) 334 { 335 unsigned int len; 336 int v,pn; 337 u32 max_blocksize = svc_max_payload(rqstp); 338 339 if (!(p = decode_fh(p, &args->fh))) 340 return 0; 341 p = xdr_decode_hyper(p, &args->offset); 342 343 len = args->count = ntohl(*p++); 344 345 if (len > max_blocksize) 346 len = max_blocksize; 347 348 /* set up the kvec */ 349 v=0; 350 while (len > 0) { 351 pn = rqstp->rq_resused++; 352 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]); 353 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE; 354 len -= rqstp->rq_vec[v].iov_len; 355 v++; 356 } 357 args->vlen = v; 358 return xdr_argsize_check(rqstp, p); 359 } 360 361 int 362 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p, 363 struct nfsd3_writeargs *args) 364 { 365 unsigned int len, v, hdr, dlen; 366 u32 max_blocksize = svc_max_payload(rqstp); 367 368 if (!(p = decode_fh(p, &args->fh))) 369 return 0; 370 p = xdr_decode_hyper(p, &args->offset); 371 372 args->count = ntohl(*p++); 373 args->stable = ntohl(*p++); 374 len = args->len = ntohl(*p++); 375 /* 376 * The count must equal the amount of data passed. 377 */ 378 if (args->count != args->len) 379 return 0; 380 381 /* 382 * Check to make sure that we got the right number of 383 * bytes. 384 */ 385 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base; 386 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len 387 - hdr; 388 /* 389 * Round the length of the data which was specified up to 390 * the next multiple of XDR units and then compare that 391 * against the length which was actually received. 392 * Note that when RPCSEC/GSS (for example) is used, the 393 * data buffer can be padded so dlen might be larger 394 * than required. It must never be smaller. 395 */ 396 if (dlen < XDR_QUADLEN(len)*4) 397 return 0; 398 399 if (args->count > max_blocksize) { 400 args->count = max_blocksize; 401 len = args->len = max_blocksize; 402 } 403 rqstp->rq_vec[0].iov_base = (void*)p; 404 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr; 405 v = 0; 406 while (len > rqstp->rq_vec[v].iov_len) { 407 len -= rqstp->rq_vec[v].iov_len; 408 v++; 409 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]); 410 rqstp->rq_vec[v].iov_len = PAGE_SIZE; 411 } 412 rqstp->rq_vec[v].iov_len = len; 413 args->vlen = v + 1; 414 return 1; 415 } 416 417 int 418 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p, 419 struct nfsd3_createargs *args) 420 { 421 if (!(p = decode_fh(p, &args->fh)) 422 || !(p = decode_filename(p, &args->name, &args->len))) 423 return 0; 424 425 switch (args->createmode = ntohl(*p++)) { 426 case NFS3_CREATE_UNCHECKED: 427 case NFS3_CREATE_GUARDED: 428 p = decode_sattr3(p, &args->attrs); 429 break; 430 case NFS3_CREATE_EXCLUSIVE: 431 args->verf = p; 432 p += 2; 433 break; 434 default: 435 return 0; 436 } 437 438 return xdr_argsize_check(rqstp, p); 439 } 440 int 441 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p, 442 struct nfsd3_createargs *args) 443 { 444 if (!(p = decode_fh(p, &args->fh)) || 445 !(p = decode_filename(p, &args->name, &args->len))) 446 return 0; 447 p = decode_sattr3(p, &args->attrs); 448 449 return xdr_argsize_check(rqstp, p); 450 } 451 452 int 453 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p, 454 struct nfsd3_symlinkargs *args) 455 { 456 unsigned int len, avail; 457 char *old, *new; 458 struct kvec *vec; 459 460 if (!(p = decode_fh(p, &args->ffh)) || 461 !(p = decode_filename(p, &args->fname, &args->flen)) 462 ) 463 return 0; 464 p = decode_sattr3(p, &args->attrs); 465 466 /* now decode the pathname, which might be larger than the first page. 467 * As we have to check for nul's anyway, we copy it into a new page 468 * This page appears in the rq_res.pages list, but as pages_len is always 469 * 0, it won't get in the way 470 */ 471 len = ntohl(*p++); 472 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE) 473 return 0; 474 args->tname = new = 475 page_address(rqstp->rq_respages[rqstp->rq_resused++]); 476 args->tlen = len; 477 /* first copy and check from the first page */ 478 old = (char*)p; 479 vec = &rqstp->rq_arg.head[0]; 480 avail = vec->iov_len - (old - (char*)vec->iov_base); 481 while (len && avail && *old) { 482 *new++ = *old++; 483 len--; 484 avail--; 485 } 486 /* now copy next page if there is one */ 487 if (len && !avail && rqstp->rq_arg.page_len) { 488 avail = rqstp->rq_arg.page_len; 489 if (avail > PAGE_SIZE) 490 avail = PAGE_SIZE; 491 old = page_address(rqstp->rq_arg.pages[0]); 492 } 493 while (len && avail && *old) { 494 *new++ = *old++; 495 len--; 496 avail--; 497 } 498 *new = '\0'; 499 if (len) 500 return 0; 501 502 return 1; 503 } 504 505 int 506 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p, 507 struct nfsd3_mknodargs *args) 508 { 509 if (!(p = decode_fh(p, &args->fh)) 510 || !(p = decode_filename(p, &args->name, &args->len))) 511 return 0; 512 513 args->ftype = ntohl(*p++); 514 515 if (args->ftype == NF3BLK || args->ftype == NF3CHR 516 || args->ftype == NF3SOCK || args->ftype == NF3FIFO) 517 p = decode_sattr3(p, &args->attrs); 518 519 if (args->ftype == NF3BLK || args->ftype == NF3CHR) { 520 args->major = ntohl(*p++); 521 args->minor = ntohl(*p++); 522 } 523 524 return xdr_argsize_check(rqstp, p); 525 } 526 527 int 528 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p, 529 struct nfsd3_renameargs *args) 530 { 531 if (!(p = decode_fh(p, &args->ffh)) 532 || !(p = decode_filename(p, &args->fname, &args->flen)) 533 || !(p = decode_fh(p, &args->tfh)) 534 || !(p = decode_filename(p, &args->tname, &args->tlen))) 535 return 0; 536 537 return xdr_argsize_check(rqstp, p); 538 } 539 540 int 541 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, 542 struct nfsd3_readlinkargs *args) 543 { 544 if (!(p = decode_fh(p, &args->fh))) 545 return 0; 546 args->buffer = 547 page_address(rqstp->rq_respages[rqstp->rq_resused++]); 548 549 return xdr_argsize_check(rqstp, p); 550 } 551 552 int 553 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p, 554 struct nfsd3_linkargs *args) 555 { 556 if (!(p = decode_fh(p, &args->ffh)) 557 || !(p = decode_fh(p, &args->tfh)) 558 || !(p = decode_filename(p, &args->tname, &args->tlen))) 559 return 0; 560 561 return xdr_argsize_check(rqstp, p); 562 } 563 564 int 565 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p, 566 struct nfsd3_readdirargs *args) 567 { 568 if (!(p = decode_fh(p, &args->fh))) 569 return 0; 570 p = xdr_decode_hyper(p, &args->cookie); 571 args->verf = p; p += 2; 572 args->dircount = ~0; 573 args->count = ntohl(*p++); 574 575 if (args->count > PAGE_SIZE) 576 args->count = PAGE_SIZE; 577 578 args->buffer = 579 page_address(rqstp->rq_respages[rqstp->rq_resused++]); 580 581 return xdr_argsize_check(rqstp, p); 582 } 583 584 int 585 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p, 586 struct nfsd3_readdirargs *args) 587 { 588 int len, pn; 589 u32 max_blocksize = svc_max_payload(rqstp); 590 591 if (!(p = decode_fh(p, &args->fh))) 592 return 0; 593 p = xdr_decode_hyper(p, &args->cookie); 594 args->verf = p; p += 2; 595 args->dircount = ntohl(*p++); 596 args->count = ntohl(*p++); 597 598 len = (args->count > max_blocksize) ? max_blocksize : 599 args->count; 600 args->count = len; 601 602 while (len > 0) { 603 pn = rqstp->rq_resused++; 604 if (!args->buffer) 605 args->buffer = page_address(rqstp->rq_respages[pn]); 606 len -= PAGE_SIZE; 607 } 608 609 return xdr_argsize_check(rqstp, p); 610 } 611 612 int 613 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p, 614 struct nfsd3_commitargs *args) 615 { 616 if (!(p = decode_fh(p, &args->fh))) 617 return 0; 618 p = xdr_decode_hyper(p, &args->offset); 619 args->count = ntohl(*p++); 620 621 return xdr_argsize_check(rqstp, p); 622 } 623 624 /* 625 * XDR encode functions 626 */ 627 /* 628 * There must be an encoding function for void results so svc_process 629 * will work properly. 630 */ 631 int 632 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy) 633 { 634 return xdr_ressize_check(rqstp, p); 635 } 636 637 /* GETATTR */ 638 int 639 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p, 640 struct nfsd3_attrstat *resp) 641 { 642 if (resp->status == 0) { 643 lease_get_mtime(resp->fh.fh_dentry->d_inode, 644 &resp->stat.mtime); 645 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat); 646 } 647 return xdr_ressize_check(rqstp, p); 648 } 649 650 /* SETATTR, REMOVE, RMDIR */ 651 int 652 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p, 653 struct nfsd3_attrstat *resp) 654 { 655 p = encode_wcc_data(rqstp, p, &resp->fh); 656 return xdr_ressize_check(rqstp, p); 657 } 658 659 /* LOOKUP */ 660 int 661 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p, 662 struct nfsd3_diropres *resp) 663 { 664 if (resp->status == 0) { 665 p = encode_fh(p, &resp->fh); 666 p = encode_post_op_attr(rqstp, p, &resp->fh); 667 } 668 p = encode_post_op_attr(rqstp, p, &resp->dirfh); 669 return xdr_ressize_check(rqstp, p); 670 } 671 672 /* ACCESS */ 673 int 674 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p, 675 struct nfsd3_accessres *resp) 676 { 677 p = encode_post_op_attr(rqstp, p, &resp->fh); 678 if (resp->status == 0) 679 *p++ = htonl(resp->access); 680 return xdr_ressize_check(rqstp, p); 681 } 682 683 /* READLINK */ 684 int 685 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p, 686 struct nfsd3_readlinkres *resp) 687 { 688 p = encode_post_op_attr(rqstp, p, &resp->fh); 689 if (resp->status == 0) { 690 *p++ = htonl(resp->len); 691 xdr_ressize_check(rqstp, p); 692 rqstp->rq_res.page_len = resp->len; 693 if (resp->len & 3) { 694 /* need to pad the tail */ 695 rqstp->rq_res.tail[0].iov_base = p; 696 *p = 0; 697 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3); 698 } 699 return 1; 700 } else 701 return xdr_ressize_check(rqstp, p); 702 } 703 704 /* READ */ 705 int 706 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p, 707 struct nfsd3_readres *resp) 708 { 709 p = encode_post_op_attr(rqstp, p, &resp->fh); 710 if (resp->status == 0) { 711 *p++ = htonl(resp->count); 712 *p++ = htonl(resp->eof); 713 *p++ = htonl(resp->count); /* xdr opaque count */ 714 xdr_ressize_check(rqstp, p); 715 /* now update rqstp->rq_res to reflect data aswell */ 716 rqstp->rq_res.page_len = resp->count; 717 if (resp->count & 3) { 718 /* need to pad the tail */ 719 rqstp->rq_res.tail[0].iov_base = p; 720 *p = 0; 721 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3); 722 } 723 return 1; 724 } else 725 return xdr_ressize_check(rqstp, p); 726 } 727 728 /* WRITE */ 729 int 730 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p, 731 struct nfsd3_writeres *resp) 732 { 733 p = encode_wcc_data(rqstp, p, &resp->fh); 734 if (resp->status == 0) { 735 *p++ = htonl(resp->count); 736 *p++ = htonl(resp->committed); 737 *p++ = htonl(nfssvc_boot.tv_sec); 738 *p++ = htonl(nfssvc_boot.tv_usec); 739 } 740 return xdr_ressize_check(rqstp, p); 741 } 742 743 /* CREATE, MKDIR, SYMLINK, MKNOD */ 744 int 745 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p, 746 struct nfsd3_diropres *resp) 747 { 748 if (resp->status == 0) { 749 *p++ = xdr_one; 750 p = encode_fh(p, &resp->fh); 751 p = encode_post_op_attr(rqstp, p, &resp->fh); 752 } 753 p = encode_wcc_data(rqstp, p, &resp->dirfh); 754 return xdr_ressize_check(rqstp, p); 755 } 756 757 /* RENAME */ 758 int 759 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p, 760 struct nfsd3_renameres *resp) 761 { 762 p = encode_wcc_data(rqstp, p, &resp->ffh); 763 p = encode_wcc_data(rqstp, p, &resp->tfh); 764 return xdr_ressize_check(rqstp, p); 765 } 766 767 /* LINK */ 768 int 769 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p, 770 struct nfsd3_linkres *resp) 771 { 772 p = encode_post_op_attr(rqstp, p, &resp->fh); 773 p = encode_wcc_data(rqstp, p, &resp->tfh); 774 return xdr_ressize_check(rqstp, p); 775 } 776 777 /* READDIR */ 778 int 779 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p, 780 struct nfsd3_readdirres *resp) 781 { 782 p = encode_post_op_attr(rqstp, p, &resp->fh); 783 784 if (resp->status == 0) { 785 /* stupid readdir cookie */ 786 memcpy(p, resp->verf, 8); p += 2; 787 xdr_ressize_check(rqstp, p); 788 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE) 789 return 1; /*No room for trailer */ 790 rqstp->rq_res.page_len = (resp->count) << 2; 791 792 /* add the 'tail' to the end of the 'head' page - page 0. */ 793 rqstp->rq_res.tail[0].iov_base = p; 794 *p++ = 0; /* no more entries */ 795 *p++ = htonl(resp->common.err == nfserr_eof); 796 rqstp->rq_res.tail[0].iov_len = 2<<2; 797 return 1; 798 } else 799 return xdr_ressize_check(rqstp, p); 800 } 801 802 static __be32 * 803 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, 804 int namlen, u64 ino) 805 { 806 *p++ = xdr_one; /* mark entry present */ 807 p = xdr_encode_hyper(p, ino); /* file id */ 808 p = xdr_encode_array(p, name, namlen);/* name length & name */ 809 810 cd->offset = p; /* remember pointer */ 811 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */ 812 813 return p; 814 } 815 816 static __be32 * 817 encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, 818 struct svc_fh *fhp) 819 { 820 p = encode_post_op_attr(cd->rqstp, p, fhp); 821 *p++ = xdr_one; /* yes, a file handle follows */ 822 p = encode_fh(p, fhp); 823 fh_put(fhp); 824 return p; 825 } 826 827 static int 828 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, 829 const char *name, int namlen) 830 { 831 struct svc_export *exp; 832 struct dentry *dparent, *dchild; 833 int rv = 0; 834 835 dparent = cd->fh.fh_dentry; 836 exp = cd->fh.fh_export; 837 838 fh_init(fhp, NFS3_FHSIZE); 839 if (isdotent(name, namlen)) { 840 if (namlen == 2) { 841 dchild = dget_parent(dparent); 842 if (dchild == dparent) { 843 /* filesystem root - cannot return filehandle for ".." */ 844 dput(dchild); 845 return 1; 846 } 847 } else 848 dchild = dget(dparent); 849 } else 850 dchild = lookup_one_len(name, dparent, namlen); 851 if (IS_ERR(dchild)) 852 return 1; 853 if (d_mountpoint(dchild) || 854 fh_compose(fhp, exp, dchild, &cd->fh) != 0 || 855 !dchild->d_inode) 856 rv = 1; 857 dput(dchild); 858 return rv; 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 int pn; /* current page number */ 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 (pn=1; pn < cd->rqstp->rq_resused; pn++) { 919 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]); 920 921 if (((caddr_t)cd->buffer >= curr_page_addr) && 922 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE)) 923 break; 924 } 925 926 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) { 927 /* encode entry in current page */ 928 929 p = encode_entry_baggage(cd, p, name, namlen, ino); 930 931 /* throw in readdirplus baggage */ 932 if (plus) { 933 struct svc_fh fh; 934 935 if (compose_entry_fh(cd, &fh, name, namlen) > 0) { 936 *p++ = 0; 937 *p++ = 0; 938 } else 939 p = encode_entryplus_baggage(cd, p, &fh); 940 } 941 num_entry_words = p - cd->buffer; 942 } else if (cd->rqstp->rq_respages[pn+1] != NULL) { 943 /* temporarily encode entry into next page, then move back to 944 * current and next page in rq_respages[] */ 945 __be32 *p1, *tmp; 946 int len1, len2; 947 948 /* grab next page for temporary storage of entry */ 949 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]); 950 951 p1 = encode_entry_baggage(cd, p1, name, namlen, ino); 952 953 /* throw in readdirplus baggage */ 954 if (plus) { 955 struct svc_fh fh; 956 957 if (compose_entry_fh(cd, &fh, name, namlen) > 0) { 958 /* zero out the filehandle */ 959 *p1++ = 0; 960 *p1++ = 0; 961 } else 962 p1 = encode_entryplus_baggage(cd, p1, &fh); 963 } 964 965 /* determine entry word length and lengths to go in pages */ 966 num_entry_words = p1 - tmp; 967 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer; 968 if ((num_entry_words << 2) < len1) { 969 /* the actual number of words in the entry is less 970 * than elen and can still fit in the current page 971 */ 972 memmove(p, tmp, num_entry_words << 2); 973 p += num_entry_words; 974 975 /* update offset */ 976 cd->offset = cd->buffer + (cd->offset - tmp); 977 } else { 978 unsigned int offset_r = (cd->offset - tmp) << 2; 979 980 /* update pointer to offset location. 981 * This is a 64bit quantity, so we need to 982 * deal with 3 cases: 983 * - entirely in first page 984 * - entirely in second page 985 * - 4 bytes in each page 986 */ 987 if (offset_r + 8 <= len1) { 988 cd->offset = p + (cd->offset - tmp); 989 } else if (offset_r >= len1) { 990 cd->offset -= len1 >> 2; 991 } else { 992 /* sitting on the fence */ 993 BUG_ON(offset_r != len1 - 4); 994 cd->offset = p + (cd->offset - tmp); 995 cd->offset1 = tmp; 996 } 997 998 len2 = (num_entry_words << 2) - len1; 999 1000 /* move from temp page to current and next pages */ 1001 memmove(p, tmp, len1); 1002 memmove(tmp, (caddr_t)tmp+len1, len2); 1003 1004 p = tmp + (len2 >> 2); 1005 } 1006 } 1007 else { 1008 cd->common.err = nfserr_toosmall; 1009 return -EINVAL; 1010 } 1011 1012 cd->buflen -= num_entry_words; 1013 cd->buffer = p; 1014 cd->common.err = nfs_ok; 1015 return 0; 1016 1017 } 1018 1019 int 1020 nfs3svc_encode_entry(void *cd, const char *name, 1021 int namlen, loff_t offset, u64 ino, unsigned int d_type) 1022 { 1023 return encode_entry(cd, name, namlen, offset, ino, d_type, 0); 1024 } 1025 1026 int 1027 nfs3svc_encode_entry_plus(void *cd, const char *name, 1028 int namlen, loff_t offset, u64 ino, 1029 unsigned int d_type) 1030 { 1031 return encode_entry(cd, name, namlen, offset, ino, d_type, 1); 1032 } 1033 1034 /* FSSTAT */ 1035 int 1036 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p, 1037 struct nfsd3_fsstatres *resp) 1038 { 1039 struct kstatfs *s = &resp->stats; 1040 u64 bs = s->f_bsize; 1041 1042 *p++ = xdr_zero; /* no post_op_attr */ 1043 1044 if (resp->status == 0) { 1045 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */ 1046 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */ 1047 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */ 1048 p = xdr_encode_hyper(p, s->f_files); /* total inodes */ 1049 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */ 1050 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */ 1051 *p++ = htonl(resp->invarsec); /* mean unchanged time */ 1052 } 1053 return xdr_ressize_check(rqstp, p); 1054 } 1055 1056 /* FSINFO */ 1057 int 1058 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p, 1059 struct nfsd3_fsinfores *resp) 1060 { 1061 *p++ = xdr_zero; /* no post_op_attr */ 1062 1063 if (resp->status == 0) { 1064 *p++ = htonl(resp->f_rtmax); 1065 *p++ = htonl(resp->f_rtpref); 1066 *p++ = htonl(resp->f_rtmult); 1067 *p++ = htonl(resp->f_wtmax); 1068 *p++ = htonl(resp->f_wtpref); 1069 *p++ = htonl(resp->f_wtmult); 1070 *p++ = htonl(resp->f_dtpref); 1071 p = xdr_encode_hyper(p, resp->f_maxfilesize); 1072 *p++ = xdr_one; 1073 *p++ = xdr_zero; 1074 *p++ = htonl(resp->f_properties); 1075 } 1076 1077 return xdr_ressize_check(rqstp, p); 1078 } 1079 1080 /* PATHCONF */ 1081 int 1082 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p, 1083 struct nfsd3_pathconfres *resp) 1084 { 1085 *p++ = xdr_zero; /* no post_op_attr */ 1086 1087 if (resp->status == 0) { 1088 *p++ = htonl(resp->p_link_max); 1089 *p++ = htonl(resp->p_name_max); 1090 *p++ = htonl(resp->p_no_trunc); 1091 *p++ = htonl(resp->p_chown_restricted); 1092 *p++ = htonl(resp->p_case_insensitive); 1093 *p++ = htonl(resp->p_case_preserving); 1094 } 1095 1096 return xdr_ressize_check(rqstp, p); 1097 } 1098 1099 /* COMMIT */ 1100 int 1101 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p, 1102 struct nfsd3_commitres *resp) 1103 { 1104 p = encode_wcc_data(rqstp, p, &resp->fh); 1105 /* Write verifier */ 1106 if (resp->status == 0) { 1107 *p++ = htonl(nfssvc_boot.tv_sec); 1108 *p++ = htonl(nfssvc_boot.tv_usec); 1109 } 1110 return xdr_ressize_check(rqstp, p); 1111 } 1112 1113 /* 1114 * XDR release functions 1115 */ 1116 int 1117 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p, 1118 struct nfsd3_attrstat *resp) 1119 { 1120 fh_put(&resp->fh); 1121 return 1; 1122 } 1123 1124 int 1125 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p, 1126 struct nfsd3_fhandle_pair *resp) 1127 { 1128 fh_put(&resp->fh1); 1129 fh_put(&resp->fh2); 1130 return 1; 1131 } 1132