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 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]); 178 *p++ = htonl((u32) stat->mode); 179 *p++ = htonl((u32) stat->nlink); 180 *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid)); 181 *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid)); 182 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) { 183 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); 184 } else { 185 p = xdr_encode_hyper(p, (u64) stat->size); 186 } 187 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9); 188 *p++ = htonl((u32) MAJOR(stat->rdev)); 189 *p++ = htonl((u32) MINOR(stat->rdev)); 190 p = encode_fsid(p, fhp); 191 p = xdr_encode_hyper(p, stat->ino); 192 p = encode_time3(p, &stat->atime); 193 p = encode_time3(p, &stat->mtime); 194 p = encode_time3(p, &stat->ctime); 195 196 return p; 197 } 198 199 static __be32 * 200 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 201 { 202 /* Attributes to follow */ 203 *p++ = xdr_one; 204 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr); 205 } 206 207 /* 208 * Encode post-operation attributes. 209 * The inode may be NULL if the call failed because of a stale file 210 * handle. In this case, no attributes are returned. 211 */ 212 static __be32 * 213 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 214 { 215 struct dentry *dentry = fhp->fh_dentry; 216 if (dentry && dentry->d_inode) { 217 int err; 218 struct kstat stat; 219 220 err = vfs_getattr(fhp->fh_export->ex_mnt, dentry, &stat); 221 if (!err) { 222 *p++ = xdr_one; /* attributes follow */ 223 lease_get_mtime(dentry->d_inode, &stat.mtime); 224 return encode_fattr3(rqstp, p, fhp, &stat); 225 } 226 } 227 *p++ = xdr_zero; 228 return p; 229 } 230 231 /* Helper for NFSv3 ACLs */ 232 __be32 * 233 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 234 { 235 return encode_post_op_attr(rqstp, p, fhp); 236 } 237 238 /* 239 * Enocde weak cache consistency data 240 */ 241 static __be32 * 242 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 243 { 244 struct dentry *dentry = fhp->fh_dentry; 245 246 if (dentry && dentry->d_inode && fhp->fh_post_saved) { 247 if (fhp->fh_pre_saved) { 248 *p++ = xdr_one; 249 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size); 250 p = encode_time3(p, &fhp->fh_pre_mtime); 251 p = encode_time3(p, &fhp->fh_pre_ctime); 252 } else { 253 *p++ = xdr_zero; 254 } 255 return encode_saved_post_attr(rqstp, p, fhp); 256 } 257 /* no pre- or post-attrs */ 258 *p++ = xdr_zero; 259 return encode_post_op_attr(rqstp, p, fhp); 260 } 261 262 /* 263 * Fill in the post_op attr for the wcc data 264 */ 265 void fill_post_wcc(struct svc_fh *fhp) 266 { 267 int err; 268 269 if (fhp->fh_post_saved) 270 printk("nfsd: inode locked twice during operation.\n"); 271 272 err = vfs_getattr(fhp->fh_export->ex_mnt, fhp->fh_dentry, 273 &fhp->fh_post_attr); 274 if (err) 275 fhp->fh_post_saved = 0; 276 else 277 fhp->fh_post_saved = 1; 278 } 279 280 /* 281 * XDR decode functions 282 */ 283 int 284 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args) 285 { 286 if (!(p = decode_fh(p, &args->fh))) 287 return 0; 288 return xdr_argsize_check(rqstp, p); 289 } 290 291 int 292 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p, 293 struct nfsd3_sattrargs *args) 294 { 295 if (!(p = decode_fh(p, &args->fh))) 296 return 0; 297 p = decode_sattr3(p, &args->attrs); 298 299 if ((args->check_guard = ntohl(*p++)) != 0) { 300 struct timespec time; 301 p = decode_time3(p, &time); 302 args->guardtime = time.tv_sec; 303 } 304 305 return xdr_argsize_check(rqstp, p); 306 } 307 308 int 309 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p, 310 struct nfsd3_diropargs *args) 311 { 312 if (!(p = decode_fh(p, &args->fh)) 313 || !(p = decode_filename(p, &args->name, &args->len))) 314 return 0; 315 316 return xdr_argsize_check(rqstp, p); 317 } 318 319 int 320 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p, 321 struct nfsd3_accessargs *args) 322 { 323 if (!(p = decode_fh(p, &args->fh))) 324 return 0; 325 args->access = ntohl(*p++); 326 327 return xdr_argsize_check(rqstp, p); 328 } 329 330 int 331 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p, 332 struct nfsd3_readargs *args) 333 { 334 unsigned int len; 335 int v,pn; 336 u32 max_blocksize = svc_max_payload(rqstp); 337 338 if (!(p = decode_fh(p, &args->fh))) 339 return 0; 340 p = xdr_decode_hyper(p, &args->offset); 341 342 len = args->count = ntohl(*p++); 343 344 if (len > max_blocksize) 345 len = max_blocksize; 346 347 /* set up the kvec */ 348 v=0; 349 while (len > 0) { 350 pn = rqstp->rq_resused++; 351 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]); 352 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE; 353 len -= rqstp->rq_vec[v].iov_len; 354 v++; 355 } 356 args->vlen = v; 357 return xdr_argsize_check(rqstp, p); 358 } 359 360 int 361 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p, 362 struct nfsd3_writeargs *args) 363 { 364 unsigned int len, v, hdr, dlen; 365 u32 max_blocksize = svc_max_payload(rqstp); 366 367 if (!(p = decode_fh(p, &args->fh))) 368 return 0; 369 p = xdr_decode_hyper(p, &args->offset); 370 371 args->count = ntohl(*p++); 372 args->stable = ntohl(*p++); 373 len = args->len = ntohl(*p++); 374 /* 375 * The count must equal the amount of data passed. 376 */ 377 if (args->count != args->len) 378 return 0; 379 380 /* 381 * Check to make sure that we got the right number of 382 * bytes. 383 */ 384 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base; 385 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len 386 - hdr; 387 /* 388 * Round the length of the data which was specified up to 389 * the next multiple of XDR units and then compare that 390 * against the length which was actually received. 391 */ 392 if (dlen != XDR_QUADLEN(len)*4) 393 return 0; 394 395 if (args->count > max_blocksize) { 396 args->count = max_blocksize; 397 len = args->len = max_blocksize; 398 } 399 rqstp->rq_vec[0].iov_base = (void*)p; 400 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr; 401 v = 0; 402 while (len > rqstp->rq_vec[v].iov_len) { 403 len -= rqstp->rq_vec[v].iov_len; 404 v++; 405 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]); 406 rqstp->rq_vec[v].iov_len = PAGE_SIZE; 407 } 408 rqstp->rq_vec[v].iov_len = len; 409 args->vlen = v + 1; 410 return 1; 411 } 412 413 int 414 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p, 415 struct nfsd3_createargs *args) 416 { 417 if (!(p = decode_fh(p, &args->fh)) 418 || !(p = decode_filename(p, &args->name, &args->len))) 419 return 0; 420 421 switch (args->createmode = ntohl(*p++)) { 422 case NFS3_CREATE_UNCHECKED: 423 case NFS3_CREATE_GUARDED: 424 p = decode_sattr3(p, &args->attrs); 425 break; 426 case NFS3_CREATE_EXCLUSIVE: 427 args->verf = p; 428 p += 2; 429 break; 430 default: 431 return 0; 432 } 433 434 return xdr_argsize_check(rqstp, p); 435 } 436 int 437 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p, 438 struct nfsd3_createargs *args) 439 { 440 if (!(p = decode_fh(p, &args->fh)) || 441 !(p = decode_filename(p, &args->name, &args->len))) 442 return 0; 443 p = decode_sattr3(p, &args->attrs); 444 445 return xdr_argsize_check(rqstp, p); 446 } 447 448 int 449 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p, 450 struct nfsd3_symlinkargs *args) 451 { 452 unsigned int len; 453 int avail; 454 char *old, *new; 455 struct kvec *vec; 456 457 if (!(p = decode_fh(p, &args->ffh)) || 458 !(p = decode_filename(p, &args->fname, &args->flen)) 459 ) 460 return 0; 461 p = decode_sattr3(p, &args->attrs); 462 463 /* now decode the pathname, which might be larger than the first page. 464 * As we have to check for nul's anyway, we copy it into a new page 465 * This page appears in the rq_res.pages list, but as pages_len is always 466 * 0, it won't get in the way 467 */ 468 len = ntohl(*p++); 469 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE) 470 return 0; 471 args->tname = new = 472 page_address(rqstp->rq_respages[rqstp->rq_resused++]); 473 args->tlen = len; 474 /* first copy and check from the first page */ 475 old = (char*)p; 476 vec = &rqstp->rq_arg.head[0]; 477 avail = vec->iov_len - (old - (char*)vec->iov_base); 478 while (len && avail && *old) { 479 *new++ = *old++; 480 len--; 481 avail--; 482 } 483 /* now copy next page if there is one */ 484 if (len && !avail && rqstp->rq_arg.page_len) { 485 avail = rqstp->rq_arg.page_len; 486 if (avail > PAGE_SIZE) avail = PAGE_SIZE; 487 old = page_address(rqstp->rq_arg.pages[0]); 488 } 489 while (len && avail && *old) { 490 *new++ = *old++; 491 len--; 492 avail--; 493 } 494 *new = '\0'; 495 if (len) 496 return 0; 497 498 return 1; 499 } 500 501 int 502 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p, 503 struct nfsd3_mknodargs *args) 504 { 505 if (!(p = decode_fh(p, &args->fh)) 506 || !(p = decode_filename(p, &args->name, &args->len))) 507 return 0; 508 509 args->ftype = ntohl(*p++); 510 511 if (args->ftype == NF3BLK || args->ftype == NF3CHR 512 || args->ftype == NF3SOCK || args->ftype == NF3FIFO) 513 p = decode_sattr3(p, &args->attrs); 514 515 if (args->ftype == NF3BLK || args->ftype == NF3CHR) { 516 args->major = ntohl(*p++); 517 args->minor = ntohl(*p++); 518 } 519 520 return xdr_argsize_check(rqstp, p); 521 } 522 523 int 524 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p, 525 struct nfsd3_renameargs *args) 526 { 527 if (!(p = decode_fh(p, &args->ffh)) 528 || !(p = decode_filename(p, &args->fname, &args->flen)) 529 || !(p = decode_fh(p, &args->tfh)) 530 || !(p = decode_filename(p, &args->tname, &args->tlen))) 531 return 0; 532 533 return xdr_argsize_check(rqstp, p); 534 } 535 536 int 537 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, 538 struct nfsd3_readlinkargs *args) 539 { 540 if (!(p = decode_fh(p, &args->fh))) 541 return 0; 542 args->buffer = 543 page_address(rqstp->rq_respages[rqstp->rq_resused++]); 544 545 return xdr_argsize_check(rqstp, p); 546 } 547 548 int 549 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p, 550 struct nfsd3_linkargs *args) 551 { 552 if (!(p = decode_fh(p, &args->ffh)) 553 || !(p = decode_fh(p, &args->tfh)) 554 || !(p = decode_filename(p, &args->tname, &args->tlen))) 555 return 0; 556 557 return xdr_argsize_check(rqstp, p); 558 } 559 560 int 561 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p, 562 struct nfsd3_readdirargs *args) 563 { 564 if (!(p = decode_fh(p, &args->fh))) 565 return 0; 566 p = xdr_decode_hyper(p, &args->cookie); 567 args->verf = p; p += 2; 568 args->dircount = ~0; 569 args->count = ntohl(*p++); 570 571 if (args->count > PAGE_SIZE) 572 args->count = PAGE_SIZE; 573 574 args->buffer = 575 page_address(rqstp->rq_respages[rqstp->rq_resused++]); 576 577 return xdr_argsize_check(rqstp, p); 578 } 579 580 int 581 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p, 582 struct nfsd3_readdirargs *args) 583 { 584 int len, pn; 585 u32 max_blocksize = svc_max_payload(rqstp); 586 587 if (!(p = decode_fh(p, &args->fh))) 588 return 0; 589 p = xdr_decode_hyper(p, &args->cookie); 590 args->verf = p; p += 2; 591 args->dircount = ntohl(*p++); 592 args->count = ntohl(*p++); 593 594 len = (args->count > max_blocksize) ? max_blocksize : 595 args->count; 596 args->count = len; 597 598 while (len > 0) { 599 pn = rqstp->rq_resused++; 600 if (!args->buffer) 601 args->buffer = page_address(rqstp->rq_respages[pn]); 602 len -= PAGE_SIZE; 603 } 604 605 return xdr_argsize_check(rqstp, p); 606 } 607 608 int 609 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p, 610 struct nfsd3_commitargs *args) 611 { 612 if (!(p = decode_fh(p, &args->fh))) 613 return 0; 614 p = xdr_decode_hyper(p, &args->offset); 615 args->count = ntohl(*p++); 616 617 return xdr_argsize_check(rqstp, p); 618 } 619 620 /* 621 * XDR encode functions 622 */ 623 /* 624 * There must be an encoding function for void results so svc_process 625 * will work properly. 626 */ 627 int 628 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy) 629 { 630 return xdr_ressize_check(rqstp, p); 631 } 632 633 /* GETATTR */ 634 int 635 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p, 636 struct nfsd3_attrstat *resp) 637 { 638 if (resp->status == 0) { 639 lease_get_mtime(resp->fh.fh_dentry->d_inode, 640 &resp->stat.mtime); 641 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat); 642 } 643 return xdr_ressize_check(rqstp, p); 644 } 645 646 /* SETATTR, REMOVE, RMDIR */ 647 int 648 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p, 649 struct nfsd3_attrstat *resp) 650 { 651 p = encode_wcc_data(rqstp, p, &resp->fh); 652 return xdr_ressize_check(rqstp, p); 653 } 654 655 /* LOOKUP */ 656 int 657 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p, 658 struct nfsd3_diropres *resp) 659 { 660 if (resp->status == 0) { 661 p = encode_fh(p, &resp->fh); 662 p = encode_post_op_attr(rqstp, p, &resp->fh); 663 } 664 p = encode_post_op_attr(rqstp, p, &resp->dirfh); 665 return xdr_ressize_check(rqstp, p); 666 } 667 668 /* ACCESS */ 669 int 670 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p, 671 struct nfsd3_accessres *resp) 672 { 673 p = encode_post_op_attr(rqstp, p, &resp->fh); 674 if (resp->status == 0) 675 *p++ = htonl(resp->access); 676 return xdr_ressize_check(rqstp, p); 677 } 678 679 /* READLINK */ 680 int 681 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p, 682 struct nfsd3_readlinkres *resp) 683 { 684 p = encode_post_op_attr(rqstp, p, &resp->fh); 685 if (resp->status == 0) { 686 *p++ = htonl(resp->len); 687 xdr_ressize_check(rqstp, p); 688 rqstp->rq_res.page_len = resp->len; 689 if (resp->len & 3) { 690 /* need to pad the tail */ 691 rqstp->rq_res.tail[0].iov_base = p; 692 *p = 0; 693 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3); 694 } 695 return 1; 696 } else 697 return xdr_ressize_check(rqstp, p); 698 } 699 700 /* READ */ 701 int 702 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p, 703 struct nfsd3_readres *resp) 704 { 705 p = encode_post_op_attr(rqstp, p, &resp->fh); 706 if (resp->status == 0) { 707 *p++ = htonl(resp->count); 708 *p++ = htonl(resp->eof); 709 *p++ = htonl(resp->count); /* xdr opaque count */ 710 xdr_ressize_check(rqstp, p); 711 /* now update rqstp->rq_res to reflect data aswell */ 712 rqstp->rq_res.page_len = resp->count; 713 if (resp->count & 3) { 714 /* need to pad the tail */ 715 rqstp->rq_res.tail[0].iov_base = p; 716 *p = 0; 717 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3); 718 } 719 return 1; 720 } else 721 return xdr_ressize_check(rqstp, p); 722 } 723 724 /* WRITE */ 725 int 726 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p, 727 struct nfsd3_writeres *resp) 728 { 729 p = encode_wcc_data(rqstp, p, &resp->fh); 730 if (resp->status == 0) { 731 *p++ = htonl(resp->count); 732 *p++ = htonl(resp->committed); 733 *p++ = htonl(nfssvc_boot.tv_sec); 734 *p++ = htonl(nfssvc_boot.tv_usec); 735 } 736 return xdr_ressize_check(rqstp, p); 737 } 738 739 /* CREATE, MKDIR, SYMLINK, MKNOD */ 740 int 741 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p, 742 struct nfsd3_diropres *resp) 743 { 744 if (resp->status == 0) { 745 *p++ = xdr_one; 746 p = encode_fh(p, &resp->fh); 747 p = encode_post_op_attr(rqstp, p, &resp->fh); 748 } 749 p = encode_wcc_data(rqstp, p, &resp->dirfh); 750 return xdr_ressize_check(rqstp, p); 751 } 752 753 /* RENAME */ 754 int 755 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p, 756 struct nfsd3_renameres *resp) 757 { 758 p = encode_wcc_data(rqstp, p, &resp->ffh); 759 p = encode_wcc_data(rqstp, p, &resp->tfh); 760 return xdr_ressize_check(rqstp, p); 761 } 762 763 /* LINK */ 764 int 765 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p, 766 struct nfsd3_linkres *resp) 767 { 768 p = encode_post_op_attr(rqstp, p, &resp->fh); 769 p = encode_wcc_data(rqstp, p, &resp->tfh); 770 return xdr_ressize_check(rqstp, p); 771 } 772 773 /* READDIR */ 774 int 775 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p, 776 struct nfsd3_readdirres *resp) 777 { 778 p = encode_post_op_attr(rqstp, p, &resp->fh); 779 780 if (resp->status == 0) { 781 /* stupid readdir cookie */ 782 memcpy(p, resp->verf, 8); p += 2; 783 xdr_ressize_check(rqstp, p); 784 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE) 785 return 1; /*No room for trailer */ 786 rqstp->rq_res.page_len = (resp->count) << 2; 787 788 /* add the 'tail' to the end of the 'head' page - page 0. */ 789 rqstp->rq_res.tail[0].iov_base = p; 790 *p++ = 0; /* no more entries */ 791 *p++ = htonl(resp->common.err == nfserr_eof); 792 rqstp->rq_res.tail[0].iov_len = 2<<2; 793 return 1; 794 } else 795 return xdr_ressize_check(rqstp, p); 796 } 797 798 static __be32 * 799 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, 800 int namlen, u64 ino) 801 { 802 *p++ = xdr_one; /* mark entry present */ 803 p = xdr_encode_hyper(p, ino); /* file id */ 804 p = xdr_encode_array(p, name, namlen);/* name length & name */ 805 806 cd->offset = p; /* remember pointer */ 807 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */ 808 809 return p; 810 } 811 812 static __be32 * 813 encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, 814 struct svc_fh *fhp) 815 { 816 p = encode_post_op_attr(cd->rqstp, p, fhp); 817 *p++ = xdr_one; /* yes, a file handle follows */ 818 p = encode_fh(p, fhp); 819 fh_put(fhp); 820 return p; 821 } 822 823 static int 824 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, 825 const char *name, int namlen) 826 { 827 struct svc_export *exp; 828 struct dentry *dparent, *dchild; 829 int rv = 0; 830 831 dparent = cd->fh.fh_dentry; 832 exp = cd->fh.fh_export; 833 834 fh_init(fhp, NFS3_FHSIZE); 835 if (isdotent(name, namlen)) { 836 if (namlen == 2) { 837 dchild = dget_parent(dparent); 838 if (dchild == dparent) { 839 /* filesystem root - cannot return filehandle for ".." */ 840 dput(dchild); 841 return 1; 842 } 843 } else 844 dchild = dget(dparent); 845 } else 846 dchild = lookup_one_len(name, dparent, namlen); 847 if (IS_ERR(dchild)) 848 return 1; 849 if (d_mountpoint(dchild) || 850 fh_compose(fhp, exp, dchild, &cd->fh) != 0 || 851 !dchild->d_inode) 852 rv = 1; 853 dput(dchild); 854 return rv; 855 } 856 857 /* 858 * Encode a directory entry. This one works for both normal readdir 859 * and readdirplus. 860 * The normal readdir reply requires 2 (fileid) + 1 (stringlen) 861 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen. 862 * 863 * The readdirplus baggage is 1+21 words for post_op_attr, plus the 864 * file handle. 865 */ 866 867 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1) 868 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2)) 869 static int 870 encode_entry(struct readdir_cd *ccd, const char *name, int namlen, 871 loff_t offset, u64 ino, unsigned int d_type, int plus) 872 { 873 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres, 874 common); 875 __be32 *p = cd->buffer; 876 caddr_t curr_page_addr = NULL; 877 int pn; /* current page number */ 878 int slen; /* string (name) length */ 879 int elen; /* estimated entry length in words */ 880 int num_entry_words = 0; /* actual number of words */ 881 882 if (cd->offset) { 883 u64 offset64 = offset; 884 885 if (unlikely(cd->offset1)) { 886 /* we ended up with offset on a page boundary */ 887 *cd->offset = htonl(offset64 >> 32); 888 *cd->offset1 = htonl(offset64 & 0xffffffff); 889 cd->offset1 = NULL; 890 } else { 891 xdr_encode_hyper(cd->offset, offset64); 892 } 893 } 894 895 /* 896 dprintk("encode_entry(%.*s @%ld%s)\n", 897 namlen, name, (long) offset, plus? " plus" : ""); 898 */ 899 900 /* truncate filename if too long */ 901 if (namlen > NFS3_MAXNAMLEN) 902 namlen = NFS3_MAXNAMLEN; 903 904 slen = XDR_QUADLEN(namlen); 905 elen = slen + NFS3_ENTRY_BAGGAGE 906 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0); 907 908 if (cd->buflen < elen) { 909 cd->common.err = nfserr_toosmall; 910 return -EINVAL; 911 } 912 913 /* determine which page in rq_respages[] we are currently filling */ 914 for (pn=1; pn < cd->rqstp->rq_resused; pn++) { 915 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]); 916 917 if (((caddr_t)cd->buffer >= curr_page_addr) && 918 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE)) 919 break; 920 } 921 922 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) { 923 /* encode entry in current page */ 924 925 p = encode_entry_baggage(cd, p, name, namlen, ino); 926 927 /* throw in readdirplus baggage */ 928 if (plus) { 929 struct svc_fh fh; 930 931 if (compose_entry_fh(cd, &fh, name, namlen) > 0) { 932 *p++ = 0; 933 *p++ = 0; 934 } else 935 p = encode_entryplus_baggage(cd, p, &fh); 936 } 937 num_entry_words = p - cd->buffer; 938 } else if (cd->rqstp->rq_respages[pn+1] != NULL) { 939 /* temporarily encode entry into next page, then move back to 940 * current and next page in rq_respages[] */ 941 __be32 *p1, *tmp; 942 int len1, len2; 943 944 /* grab next page for temporary storage of entry */ 945 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]); 946 947 p1 = encode_entry_baggage(cd, p1, name, namlen, ino); 948 949 /* throw in readdirplus baggage */ 950 if (plus) { 951 struct svc_fh fh; 952 953 if (compose_entry_fh(cd, &fh, name, namlen) > 0) { 954 /* zero out the filehandle */ 955 *p1++ = 0; 956 *p1++ = 0; 957 } else 958 p1 = encode_entryplus_baggage(cd, p1, &fh); 959 } 960 961 /* determine entry word length and lengths to go in pages */ 962 num_entry_words = p1 - tmp; 963 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer; 964 if ((num_entry_words << 2) < len1) { 965 /* the actual number of words in the entry is less 966 * than elen and can still fit in the current page 967 */ 968 memmove(p, tmp, num_entry_words << 2); 969 p += num_entry_words; 970 971 /* update offset */ 972 cd->offset = cd->buffer + (cd->offset - tmp); 973 } else { 974 unsigned int offset_r = (cd->offset - tmp) << 2; 975 976 /* update pointer to offset location. 977 * This is a 64bit quantity, so we need to 978 * deal with 3 cases: 979 * - entirely in first page 980 * - entirely in second page 981 * - 4 bytes in each page 982 */ 983 if (offset_r + 8 <= len1) { 984 cd->offset = p + (cd->offset - tmp); 985 } else if (offset_r >= len1) { 986 cd->offset -= len1 >> 2; 987 } else { 988 /* sitting on the fence */ 989 BUG_ON(offset_r != len1 - 4); 990 cd->offset = p + (cd->offset - tmp); 991 cd->offset1 = tmp; 992 } 993 994 len2 = (num_entry_words << 2) - len1; 995 996 /* move from temp page to current and next pages */ 997 memmove(p, tmp, len1); 998 memmove(tmp, (caddr_t)tmp+len1, len2); 999 1000 p = tmp + (len2 >> 2); 1001 } 1002 } 1003 else { 1004 cd->common.err = nfserr_toosmall; 1005 return -EINVAL; 1006 } 1007 1008 cd->buflen -= num_entry_words; 1009 cd->buffer = p; 1010 cd->common.err = nfs_ok; 1011 return 0; 1012 1013 } 1014 1015 int 1016 nfs3svc_encode_entry(void *cd, const char *name, 1017 int namlen, loff_t offset, u64 ino, unsigned int d_type) 1018 { 1019 return encode_entry(cd, name, namlen, offset, ino, d_type, 0); 1020 } 1021 1022 int 1023 nfs3svc_encode_entry_plus(void *cd, const char *name, 1024 int namlen, loff_t offset, u64 ino, 1025 unsigned int d_type) 1026 { 1027 return encode_entry(cd, name, namlen, offset, ino, d_type, 1); 1028 } 1029 1030 /* FSSTAT */ 1031 int 1032 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p, 1033 struct nfsd3_fsstatres *resp) 1034 { 1035 struct kstatfs *s = &resp->stats; 1036 u64 bs = s->f_bsize; 1037 1038 *p++ = xdr_zero; /* no post_op_attr */ 1039 1040 if (resp->status == 0) { 1041 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */ 1042 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */ 1043 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */ 1044 p = xdr_encode_hyper(p, s->f_files); /* total inodes */ 1045 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */ 1046 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */ 1047 *p++ = htonl(resp->invarsec); /* mean unchanged time */ 1048 } 1049 return xdr_ressize_check(rqstp, p); 1050 } 1051 1052 /* FSINFO */ 1053 int 1054 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p, 1055 struct nfsd3_fsinfores *resp) 1056 { 1057 *p++ = xdr_zero; /* no post_op_attr */ 1058 1059 if (resp->status == 0) { 1060 *p++ = htonl(resp->f_rtmax); 1061 *p++ = htonl(resp->f_rtpref); 1062 *p++ = htonl(resp->f_rtmult); 1063 *p++ = htonl(resp->f_wtmax); 1064 *p++ = htonl(resp->f_wtpref); 1065 *p++ = htonl(resp->f_wtmult); 1066 *p++ = htonl(resp->f_dtpref); 1067 p = xdr_encode_hyper(p, resp->f_maxfilesize); 1068 *p++ = xdr_one; 1069 *p++ = xdr_zero; 1070 *p++ = htonl(resp->f_properties); 1071 } 1072 1073 return xdr_ressize_check(rqstp, p); 1074 } 1075 1076 /* PATHCONF */ 1077 int 1078 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p, 1079 struct nfsd3_pathconfres *resp) 1080 { 1081 *p++ = xdr_zero; /* no post_op_attr */ 1082 1083 if (resp->status == 0) { 1084 *p++ = htonl(resp->p_link_max); 1085 *p++ = htonl(resp->p_name_max); 1086 *p++ = htonl(resp->p_no_trunc); 1087 *p++ = htonl(resp->p_chown_restricted); 1088 *p++ = htonl(resp->p_case_insensitive); 1089 *p++ = htonl(resp->p_case_preserving); 1090 } 1091 1092 return xdr_ressize_check(rqstp, p); 1093 } 1094 1095 /* COMMIT */ 1096 int 1097 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p, 1098 struct nfsd3_commitres *resp) 1099 { 1100 p = encode_wcc_data(rqstp, p, &resp->fh); 1101 /* Write verifier */ 1102 if (resp->status == 0) { 1103 *p++ = htonl(nfssvc_boot.tv_sec); 1104 *p++ = htonl(nfssvc_boot.tv_usec); 1105 } 1106 return xdr_ressize_check(rqstp, p); 1107 } 1108 1109 /* 1110 * XDR release functions 1111 */ 1112 int 1113 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p, 1114 struct nfsd3_attrstat *resp) 1115 { 1116 fh_put(&resp->fh); 1117 return 1; 1118 } 1119 1120 int 1121 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p, 1122 struct nfsd3_fhandle_pair *resp) 1123 { 1124 fh_put(&resp->fh1); 1125 fh_put(&resp->fh2); 1126 return 1; 1127 } 1128