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 #ifdef NFSD_OPTIMIZE_SPACE 28 # define inline 29 #endif 30 31 32 /* 33 * Mapping of S_IF* types to NFS file types 34 */ 35 static u32 nfs3_ftypes[] = { 36 NF3NON, NF3FIFO, NF3CHR, NF3BAD, 37 NF3DIR, NF3BAD, NF3BLK, NF3BAD, 38 NF3REG, NF3BAD, NF3LNK, NF3BAD, 39 NF3SOCK, NF3BAD, NF3LNK, NF3BAD, 40 }; 41 42 /* 43 * XDR functions for basic NFS types 44 */ 45 static inline u32 * 46 encode_time3(u32 *p, struct timespec *time) 47 { 48 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec); 49 return p; 50 } 51 52 static inline u32 * 53 decode_time3(u32 *p, struct timespec *time) 54 { 55 time->tv_sec = ntohl(*p++); 56 time->tv_nsec = ntohl(*p++); 57 return p; 58 } 59 60 static inline u32 * 61 decode_fh(u32 *p, struct svc_fh *fhp) 62 { 63 unsigned int size; 64 fh_init(fhp, NFS3_FHSIZE); 65 size = ntohl(*p++); 66 if (size > NFS3_FHSIZE) 67 return NULL; 68 69 memcpy(&fhp->fh_handle.fh_base, p, size); 70 fhp->fh_handle.fh_size = size; 71 return p + XDR_QUADLEN(size); 72 } 73 74 /* Helper function for NFSv3 ACL code */ 75 u32 *nfs3svc_decode_fh(u32 *p, struct svc_fh *fhp) 76 { 77 return decode_fh(p, fhp); 78 } 79 80 static inline u32 * 81 encode_fh(u32 *p, struct svc_fh *fhp) 82 { 83 unsigned int size = fhp->fh_handle.fh_size; 84 *p++ = htonl(size); 85 if (size) p[XDR_QUADLEN(size)-1]=0; 86 memcpy(p, &fhp->fh_handle.fh_base, size); 87 return p + XDR_QUADLEN(size); 88 } 89 90 /* 91 * Decode a file name and make sure that the path contains 92 * no slashes or null bytes. 93 */ 94 static inline u32 * 95 decode_filename(u32 *p, char **namp, int *lenp) 96 { 97 char *name; 98 int i; 99 100 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) { 101 for (i = 0, name = *namp; i < *lenp; i++, name++) { 102 if (*name == '\0' || *name == '/') 103 return NULL; 104 } 105 } 106 107 return p; 108 } 109 110 static inline u32 * 111 decode_sattr3(u32 *p, struct iattr *iap) 112 { 113 u32 tmp; 114 115 iap->ia_valid = 0; 116 117 if (*p++) { 118 iap->ia_valid |= ATTR_MODE; 119 iap->ia_mode = ntohl(*p++); 120 } 121 if (*p++) { 122 iap->ia_valid |= ATTR_UID; 123 iap->ia_uid = ntohl(*p++); 124 } 125 if (*p++) { 126 iap->ia_valid |= ATTR_GID; 127 iap->ia_gid = ntohl(*p++); 128 } 129 if (*p++) { 130 u64 newsize; 131 132 iap->ia_valid |= ATTR_SIZE; 133 p = xdr_decode_hyper(p, &newsize); 134 if (newsize <= NFS_OFFSET_MAX) 135 iap->ia_size = newsize; 136 else 137 iap->ia_size = NFS_OFFSET_MAX; 138 } 139 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ 140 iap->ia_valid |= ATTR_ATIME; 141 } else if (tmp == 2) { /* set to client time */ 142 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; 143 iap->ia_atime.tv_sec = ntohl(*p++); 144 iap->ia_atime.tv_nsec = ntohl(*p++); 145 } 146 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ 147 iap->ia_valid |= ATTR_MTIME; 148 } else if (tmp == 2) { /* set to client time */ 149 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; 150 iap->ia_mtime.tv_sec = ntohl(*p++); 151 iap->ia_mtime.tv_nsec = ntohl(*p++); 152 } 153 return p; 154 } 155 156 static inline u32 * 157 encode_fattr3(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) 158 { 159 struct vfsmount *mnt = fhp->fh_export->ex_mnt; 160 struct dentry *dentry = fhp->fh_dentry; 161 struct kstat stat; 162 struct timespec time; 163 164 vfs_getattr(mnt, dentry, &stat); 165 166 *p++ = htonl(nfs3_ftypes[(stat.mode & S_IFMT) >> 12]); 167 *p++ = htonl((u32) stat.mode); 168 *p++ = htonl((u32) stat.nlink); 169 *p++ = htonl((u32) nfsd_ruid(rqstp, stat.uid)); 170 *p++ = htonl((u32) nfsd_rgid(rqstp, stat.gid)); 171 if (S_ISLNK(stat.mode) && stat.size > NFS3_MAXPATHLEN) { 172 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); 173 } else { 174 p = xdr_encode_hyper(p, (u64) stat.size); 175 } 176 p = xdr_encode_hyper(p, ((u64)stat.blocks) << 9); 177 *p++ = htonl((u32) MAJOR(stat.rdev)); 178 *p++ = htonl((u32) MINOR(stat.rdev)); 179 if (is_fsid(fhp, rqstp->rq_reffh)) 180 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); 181 else 182 p = xdr_encode_hyper(p, (u64) huge_encode_dev(stat.dev)); 183 p = xdr_encode_hyper(p, (u64) stat.ino); 184 p = encode_time3(p, &stat.atime); 185 lease_get_mtime(dentry->d_inode, &time); 186 p = encode_time3(p, &time); 187 p = encode_time3(p, &stat.ctime); 188 189 return p; 190 } 191 192 static inline u32 * 193 encode_saved_post_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) 194 { 195 struct inode *inode = fhp->fh_dentry->d_inode; 196 197 /* Attributes to follow */ 198 *p++ = xdr_one; 199 200 *p++ = htonl(nfs3_ftypes[(fhp->fh_post_mode & S_IFMT) >> 12]); 201 *p++ = htonl((u32) fhp->fh_post_mode); 202 *p++ = htonl((u32) fhp->fh_post_nlink); 203 *p++ = htonl((u32) nfsd_ruid(rqstp, fhp->fh_post_uid)); 204 *p++ = htonl((u32) nfsd_rgid(rqstp, fhp->fh_post_gid)); 205 if (S_ISLNK(fhp->fh_post_mode) && fhp->fh_post_size > NFS3_MAXPATHLEN) { 206 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); 207 } else { 208 p = xdr_encode_hyper(p, (u64) fhp->fh_post_size); 209 } 210 p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9); 211 *p++ = fhp->fh_post_rdev[0]; 212 *p++ = fhp->fh_post_rdev[1]; 213 if (is_fsid(fhp, rqstp->rq_reffh)) 214 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); 215 else 216 p = xdr_encode_hyper(p, (u64)huge_encode_dev(inode->i_sb->s_dev)); 217 p = xdr_encode_hyper(p, (u64) inode->i_ino); 218 p = encode_time3(p, &fhp->fh_post_atime); 219 p = encode_time3(p, &fhp->fh_post_mtime); 220 p = encode_time3(p, &fhp->fh_post_ctime); 221 222 return p; 223 } 224 225 /* 226 * Encode post-operation attributes. 227 * The inode may be NULL if the call failed because of a stale file 228 * handle. In this case, no attributes are returned. 229 */ 230 static u32 * 231 encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) 232 { 233 struct dentry *dentry = fhp->fh_dentry; 234 if (dentry && dentry->d_inode != NULL) { 235 *p++ = xdr_one; /* attributes follow */ 236 return encode_fattr3(rqstp, p, fhp); 237 } 238 *p++ = xdr_zero; 239 return p; 240 } 241 242 /* Helper for NFSv3 ACLs */ 243 u32 * 244 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) 245 { 246 return encode_post_op_attr(rqstp, p, fhp); 247 } 248 249 /* 250 * Enocde weak cache consistency data 251 */ 252 static u32 * 253 encode_wcc_data(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) 254 { 255 struct dentry *dentry = fhp->fh_dentry; 256 257 if (dentry && dentry->d_inode && fhp->fh_post_saved) { 258 if (fhp->fh_pre_saved) { 259 *p++ = xdr_one; 260 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size); 261 p = encode_time3(p, &fhp->fh_pre_mtime); 262 p = encode_time3(p, &fhp->fh_pre_ctime); 263 } else { 264 *p++ = xdr_zero; 265 } 266 return encode_saved_post_attr(rqstp, p, fhp); 267 } 268 /* no pre- or post-attrs */ 269 *p++ = xdr_zero; 270 return encode_post_op_attr(rqstp, p, fhp); 271 } 272 273 274 /* 275 * XDR decode functions 276 */ 277 int 278 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct nfsd_fhandle *args) 279 { 280 if (!(p = decode_fh(p, &args->fh))) 281 return 0; 282 return xdr_argsize_check(rqstp, p); 283 } 284 285 int 286 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p, 287 struct nfsd3_sattrargs *args) 288 { 289 if (!(p = decode_fh(p, &args->fh)) 290 || !(p = decode_sattr3(p, &args->attrs))) 291 return 0; 292 293 if ((args->check_guard = ntohl(*p++)) != 0) { 294 struct timespec time; 295 p = decode_time3(p, &time); 296 args->guardtime = time.tv_sec; 297 } 298 299 return xdr_argsize_check(rqstp, p); 300 } 301 302 int 303 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, u32 *p, 304 struct nfsd3_diropargs *args) 305 { 306 if (!(p = decode_fh(p, &args->fh)) 307 || !(p = decode_filename(p, &args->name, &args->len))) 308 return 0; 309 310 return xdr_argsize_check(rqstp, p); 311 } 312 313 int 314 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, u32 *p, 315 struct nfsd3_accessargs *args) 316 { 317 if (!(p = decode_fh(p, &args->fh))) 318 return 0; 319 args->access = ntohl(*p++); 320 321 return xdr_argsize_check(rqstp, p); 322 } 323 324 int 325 nfs3svc_decode_readargs(struct svc_rqst *rqstp, u32 *p, 326 struct nfsd3_readargs *args) 327 { 328 unsigned int len; 329 int v,pn; 330 331 if (!(p = decode_fh(p, &args->fh)) 332 || !(p = xdr_decode_hyper(p, &args->offset))) 333 return 0; 334 335 len = args->count = ntohl(*p++); 336 337 if (len > NFSSVC_MAXBLKSIZE) 338 len = NFSSVC_MAXBLKSIZE; 339 340 /* set up the kvec */ 341 v=0; 342 while (len > 0) { 343 pn = rqstp->rq_resused; 344 svc_take_page(rqstp); 345 args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]); 346 args->vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE; 347 len -= args->vec[v].iov_len; 348 v++; 349 } 350 args->vlen = v; 351 return xdr_argsize_check(rqstp, p); 352 } 353 354 int 355 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, u32 *p, 356 struct nfsd3_writeargs *args) 357 { 358 unsigned int len, v, hdr; 359 360 if (!(p = decode_fh(p, &args->fh)) 361 || !(p = xdr_decode_hyper(p, &args->offset))) 362 return 0; 363 364 args->count = ntohl(*p++); 365 args->stable = ntohl(*p++); 366 len = args->len = ntohl(*p++); 367 368 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base; 369 if (rqstp->rq_arg.len < len + hdr) 370 return 0; 371 372 args->vec[0].iov_base = (void*)p; 373 args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr; 374 375 if (len > NFSSVC_MAXBLKSIZE) 376 len = NFSSVC_MAXBLKSIZE; 377 v= 0; 378 while (len > args->vec[v].iov_len) { 379 len -= args->vec[v].iov_len; 380 v++; 381 args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]); 382 args->vec[v].iov_len = PAGE_SIZE; 383 } 384 args->vec[v].iov_len = len; 385 args->vlen = v+1; 386 387 return args->count == args->len && args->vec[0].iov_len > 0; 388 } 389 390 int 391 nfs3svc_decode_createargs(struct svc_rqst *rqstp, u32 *p, 392 struct nfsd3_createargs *args) 393 { 394 if (!(p = decode_fh(p, &args->fh)) 395 || !(p = decode_filename(p, &args->name, &args->len))) 396 return 0; 397 398 switch (args->createmode = ntohl(*p++)) { 399 case NFS3_CREATE_UNCHECKED: 400 case NFS3_CREATE_GUARDED: 401 if (!(p = decode_sattr3(p, &args->attrs))) 402 return 0; 403 break; 404 case NFS3_CREATE_EXCLUSIVE: 405 args->verf = p; 406 p += 2; 407 break; 408 default: 409 return 0; 410 } 411 412 return xdr_argsize_check(rqstp, p); 413 } 414 int 415 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, u32 *p, 416 struct nfsd3_createargs *args) 417 { 418 if (!(p = decode_fh(p, &args->fh)) 419 || !(p = decode_filename(p, &args->name, &args->len)) 420 || !(p = decode_sattr3(p, &args->attrs))) 421 return 0; 422 423 return xdr_argsize_check(rqstp, p); 424 } 425 426 int 427 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p, 428 struct nfsd3_symlinkargs *args) 429 { 430 unsigned int len; 431 int avail; 432 char *old, *new; 433 struct kvec *vec; 434 435 if (!(p = decode_fh(p, &args->ffh)) 436 || !(p = decode_filename(p, &args->fname, &args->flen)) 437 || !(p = decode_sattr3(p, &args->attrs)) 438 ) 439 return 0; 440 /* now decode the pathname, which might be larger than the first page. 441 * As we have to check for nul's anyway, we copy it into a new page 442 * This page appears in the rq_res.pages list, but as pages_len is always 443 * 0, it won't get in the way 444 */ 445 svc_take_page(rqstp); 446 len = ntohl(*p++); 447 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE) 448 return 0; 449 args->tname = new = page_address(rqstp->rq_respages[rqstp->rq_resused-1]); 450 args->tlen = len; 451 /* first copy and check from the first page */ 452 old = (char*)p; 453 vec = &rqstp->rq_arg.head[0]; 454 avail = vec->iov_len - (old - (char*)vec->iov_base); 455 while (len && avail && *old) { 456 *new++ = *old++; 457 len--; 458 avail--; 459 } 460 /* now copy next page if there is one */ 461 if (len && !avail && rqstp->rq_arg.page_len) { 462 avail = rqstp->rq_arg.page_len; 463 if (avail > PAGE_SIZE) avail = PAGE_SIZE; 464 old = page_address(rqstp->rq_arg.pages[0]); 465 } 466 while (len && avail && *old) { 467 *new++ = *old++; 468 len--; 469 avail--; 470 } 471 *new = '\0'; 472 if (len) 473 return 0; 474 475 return 1; 476 } 477 478 int 479 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, u32 *p, 480 struct nfsd3_mknodargs *args) 481 { 482 if (!(p = decode_fh(p, &args->fh)) 483 || !(p = decode_filename(p, &args->name, &args->len))) 484 return 0; 485 486 args->ftype = ntohl(*p++); 487 488 if (args->ftype == NF3BLK || args->ftype == NF3CHR 489 || args->ftype == NF3SOCK || args->ftype == NF3FIFO) { 490 if (!(p = decode_sattr3(p, &args->attrs))) 491 return 0; 492 } 493 494 if (args->ftype == NF3BLK || args->ftype == NF3CHR) { 495 args->major = ntohl(*p++); 496 args->minor = ntohl(*p++); 497 } 498 499 return xdr_argsize_check(rqstp, p); 500 } 501 502 int 503 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, u32 *p, 504 struct nfsd3_renameargs *args) 505 { 506 if (!(p = decode_fh(p, &args->ffh)) 507 || !(p = decode_filename(p, &args->fname, &args->flen)) 508 || !(p = decode_fh(p, &args->tfh)) 509 || !(p = decode_filename(p, &args->tname, &args->tlen))) 510 return 0; 511 512 return xdr_argsize_check(rqstp, p); 513 } 514 515 int 516 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p, 517 struct nfsd3_readlinkargs *args) 518 { 519 if (!(p = decode_fh(p, &args->fh))) 520 return 0; 521 svc_take_page(rqstp); 522 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]); 523 524 return xdr_argsize_check(rqstp, p); 525 } 526 527 int 528 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, u32 *p, 529 struct nfsd3_linkargs *args) 530 { 531 if (!(p = decode_fh(p, &args->ffh)) 532 || !(p = decode_fh(p, &args->tfh)) 533 || !(p = decode_filename(p, &args->tname, &args->tlen))) 534 return 0; 535 536 return xdr_argsize_check(rqstp, p); 537 } 538 539 int 540 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p, 541 struct nfsd3_readdirargs *args) 542 { 543 if (!(p = decode_fh(p, &args->fh))) 544 return 0; 545 p = xdr_decode_hyper(p, &args->cookie); 546 args->verf = p; p += 2; 547 args->dircount = ~0; 548 args->count = ntohl(*p++); 549 550 if (args->count > PAGE_SIZE) 551 args->count = PAGE_SIZE; 552 553 svc_take_page(rqstp); 554 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]); 555 556 return xdr_argsize_check(rqstp, p); 557 } 558 559 int 560 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p, 561 struct nfsd3_readdirargs *args) 562 { 563 int len, pn; 564 565 if (!(p = decode_fh(p, &args->fh))) 566 return 0; 567 p = xdr_decode_hyper(p, &args->cookie); 568 args->verf = p; p += 2; 569 args->dircount = ntohl(*p++); 570 args->count = ntohl(*p++); 571 572 len = (args->count > NFSSVC_MAXBLKSIZE) ? NFSSVC_MAXBLKSIZE : 573 args->count; 574 args->count = len; 575 576 while (len > 0) { 577 pn = rqstp->rq_resused; 578 svc_take_page(rqstp); 579 if (!args->buffer) 580 args->buffer = page_address(rqstp->rq_respages[pn]); 581 len -= PAGE_SIZE; 582 } 583 584 return xdr_argsize_check(rqstp, p); 585 } 586 587 int 588 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, u32 *p, 589 struct nfsd3_commitargs *args) 590 { 591 if (!(p = decode_fh(p, &args->fh))) 592 return 0; 593 p = xdr_decode_hyper(p, &args->offset); 594 args->count = ntohl(*p++); 595 596 return xdr_argsize_check(rqstp, p); 597 } 598 599 /* 600 * XDR encode functions 601 */ 602 /* 603 * There must be an encoding function for void results so svc_process 604 * will work properly. 605 */ 606 int 607 nfs3svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy) 608 { 609 return xdr_ressize_check(rqstp, p); 610 } 611 612 /* GETATTR */ 613 int 614 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, u32 *p, 615 struct nfsd3_attrstat *resp) 616 { 617 if (resp->status == 0) 618 p = encode_fattr3(rqstp, p, &resp->fh); 619 return xdr_ressize_check(rqstp, p); 620 } 621 622 /* SETATTR, REMOVE, RMDIR */ 623 int 624 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, u32 *p, 625 struct nfsd3_attrstat *resp) 626 { 627 p = encode_wcc_data(rqstp, p, &resp->fh); 628 return xdr_ressize_check(rqstp, p); 629 } 630 631 /* LOOKUP */ 632 int 633 nfs3svc_encode_diropres(struct svc_rqst *rqstp, u32 *p, 634 struct nfsd3_diropres *resp) 635 { 636 if (resp->status == 0) { 637 p = encode_fh(p, &resp->fh); 638 p = encode_post_op_attr(rqstp, p, &resp->fh); 639 } 640 p = encode_post_op_attr(rqstp, p, &resp->dirfh); 641 return xdr_ressize_check(rqstp, p); 642 } 643 644 /* ACCESS */ 645 int 646 nfs3svc_encode_accessres(struct svc_rqst *rqstp, u32 *p, 647 struct nfsd3_accessres *resp) 648 { 649 p = encode_post_op_attr(rqstp, p, &resp->fh); 650 if (resp->status == 0) 651 *p++ = htonl(resp->access); 652 return xdr_ressize_check(rqstp, p); 653 } 654 655 /* READLINK */ 656 int 657 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p, 658 struct nfsd3_readlinkres *resp) 659 { 660 p = encode_post_op_attr(rqstp, p, &resp->fh); 661 if (resp->status == 0) { 662 *p++ = htonl(resp->len); 663 xdr_ressize_check(rqstp, p); 664 rqstp->rq_res.page_len = resp->len; 665 if (resp->len & 3) { 666 /* need to pad the tail */ 667 rqstp->rq_restailpage = 0; 668 rqstp->rq_res.tail[0].iov_base = p; 669 *p = 0; 670 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3); 671 } 672 return 1; 673 } else 674 return xdr_ressize_check(rqstp, p); 675 } 676 677 /* READ */ 678 int 679 nfs3svc_encode_readres(struct svc_rqst *rqstp, u32 *p, 680 struct nfsd3_readres *resp) 681 { 682 p = encode_post_op_attr(rqstp, p, &resp->fh); 683 if (resp->status == 0) { 684 *p++ = htonl(resp->count); 685 *p++ = htonl(resp->eof); 686 *p++ = htonl(resp->count); /* xdr opaque count */ 687 xdr_ressize_check(rqstp, p); 688 /* now update rqstp->rq_res to reflect data aswell */ 689 rqstp->rq_res.page_len = resp->count; 690 if (resp->count & 3) { 691 /* need to pad the tail */ 692 rqstp->rq_restailpage = 0; 693 rqstp->rq_res.tail[0].iov_base = p; 694 *p = 0; 695 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3); 696 } 697 return 1; 698 } else 699 return xdr_ressize_check(rqstp, p); 700 } 701 702 /* WRITE */ 703 int 704 nfs3svc_encode_writeres(struct svc_rqst *rqstp, u32 *p, 705 struct nfsd3_writeres *resp) 706 { 707 p = encode_wcc_data(rqstp, p, &resp->fh); 708 if (resp->status == 0) { 709 *p++ = htonl(resp->count); 710 *p++ = htonl(resp->committed); 711 *p++ = htonl(nfssvc_boot.tv_sec); 712 *p++ = htonl(nfssvc_boot.tv_usec); 713 } 714 return xdr_ressize_check(rqstp, p); 715 } 716 717 /* CREATE, MKDIR, SYMLINK, MKNOD */ 718 int 719 nfs3svc_encode_createres(struct svc_rqst *rqstp, u32 *p, 720 struct nfsd3_diropres *resp) 721 { 722 if (resp->status == 0) { 723 *p++ = xdr_one; 724 p = encode_fh(p, &resp->fh); 725 p = encode_post_op_attr(rqstp, p, &resp->fh); 726 } 727 p = encode_wcc_data(rqstp, p, &resp->dirfh); 728 return xdr_ressize_check(rqstp, p); 729 } 730 731 /* RENAME */ 732 int 733 nfs3svc_encode_renameres(struct svc_rqst *rqstp, u32 *p, 734 struct nfsd3_renameres *resp) 735 { 736 p = encode_wcc_data(rqstp, p, &resp->ffh); 737 p = encode_wcc_data(rqstp, p, &resp->tfh); 738 return xdr_ressize_check(rqstp, p); 739 } 740 741 /* LINK */ 742 int 743 nfs3svc_encode_linkres(struct svc_rqst *rqstp, u32 *p, 744 struct nfsd3_linkres *resp) 745 { 746 p = encode_post_op_attr(rqstp, p, &resp->fh); 747 p = encode_wcc_data(rqstp, p, &resp->tfh); 748 return xdr_ressize_check(rqstp, p); 749 } 750 751 /* READDIR */ 752 int 753 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, u32 *p, 754 struct nfsd3_readdirres *resp) 755 { 756 p = encode_post_op_attr(rqstp, p, &resp->fh); 757 758 if (resp->status == 0) { 759 /* stupid readdir cookie */ 760 memcpy(p, resp->verf, 8); p += 2; 761 xdr_ressize_check(rqstp, p); 762 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE) 763 return 1; /*No room for trailer */ 764 rqstp->rq_res.page_len = (resp->count) << 2; 765 766 /* add the 'tail' to the end of the 'head' page - page 0. */ 767 rqstp->rq_restailpage = 0; 768 rqstp->rq_res.tail[0].iov_base = p; 769 *p++ = 0; /* no more entries */ 770 *p++ = htonl(resp->common.err == nfserr_eof); 771 rqstp->rq_res.tail[0].iov_len = 2<<2; 772 return 1; 773 } else 774 return xdr_ressize_check(rqstp, p); 775 } 776 777 static inline u32 * 778 encode_entry_baggage(struct nfsd3_readdirres *cd, u32 *p, const char *name, 779 int namlen, ino_t ino) 780 { 781 *p++ = xdr_one; /* mark entry present */ 782 p = xdr_encode_hyper(p, ino); /* file id */ 783 p = xdr_encode_array(p, name, namlen);/* name length & name */ 784 785 cd->offset = p; /* remember pointer */ 786 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */ 787 788 return p; 789 } 790 791 static inline u32 * 792 encode_entryplus_baggage(struct nfsd3_readdirres *cd, u32 *p, 793 struct svc_fh *fhp) 794 { 795 p = encode_post_op_attr(cd->rqstp, p, fhp); 796 *p++ = xdr_one; /* yes, a file handle follows */ 797 p = encode_fh(p, fhp); 798 fh_put(fhp); 799 return p; 800 } 801 802 static int 803 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, 804 const char *name, int namlen) 805 { 806 struct svc_export *exp; 807 struct dentry *dparent, *dchild; 808 int rv = 0; 809 810 dparent = cd->fh.fh_dentry; 811 exp = cd->fh.fh_export; 812 813 fh_init(fhp, NFS3_FHSIZE); 814 if (isdotent(name, namlen)) { 815 if (namlen == 2) { 816 dchild = dget_parent(dparent); 817 if (dchild == dparent) { 818 /* filesystem root - cannot return filehandle for ".." */ 819 dput(dchild); 820 return 1; 821 } 822 } else 823 dchild = dget(dparent); 824 } else 825 dchild = lookup_one_len(name, dparent, namlen); 826 if (IS_ERR(dchild)) 827 return 1; 828 if (d_mountpoint(dchild) || 829 fh_compose(fhp, exp, dchild, &cd->fh) != 0 || 830 !dchild->d_inode) 831 rv = 1; 832 dput(dchild); 833 return rv; 834 } 835 836 /* 837 * Encode a directory entry. This one works for both normal readdir 838 * and readdirplus. 839 * The normal readdir reply requires 2 (fileid) + 1 (stringlen) 840 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen. 841 * 842 * The readdirplus baggage is 1+21 words for post_op_attr, plus the 843 * file handle. 844 */ 845 846 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1) 847 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2)) 848 static int 849 encode_entry(struct readdir_cd *ccd, const char *name, 850 int namlen, off_t offset, ino_t ino, unsigned int d_type, int plus) 851 { 852 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres, 853 common); 854 u32 *p = cd->buffer; 855 caddr_t curr_page_addr = NULL; 856 int pn; /* current page number */ 857 int slen; /* string (name) length */ 858 int elen; /* estimated entry length in words */ 859 int num_entry_words = 0; /* actual number of words */ 860 861 if (cd->offset) { 862 u64 offset64 = offset; 863 864 if (unlikely(cd->offset1)) { 865 /* we ended up with offset on a page boundary */ 866 *cd->offset = htonl(offset64 >> 32); 867 *cd->offset1 = htonl(offset64 & 0xffffffff); 868 cd->offset1 = NULL; 869 } else { 870 xdr_encode_hyper(cd->offset, (u64) offset); 871 } 872 } 873 874 /* 875 dprintk("encode_entry(%.*s @%ld%s)\n", 876 namlen, name, (long) offset, plus? " plus" : ""); 877 */ 878 879 /* truncate filename if too long */ 880 if (namlen > NFS3_MAXNAMLEN) 881 namlen = NFS3_MAXNAMLEN; 882 883 slen = XDR_QUADLEN(namlen); 884 elen = slen + NFS3_ENTRY_BAGGAGE 885 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0); 886 887 if (cd->buflen < elen) { 888 cd->common.err = nfserr_toosmall; 889 return -EINVAL; 890 } 891 892 /* determine which page in rq_respages[] we are currently filling */ 893 for (pn=1; pn < cd->rqstp->rq_resused; pn++) { 894 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]); 895 896 if (((caddr_t)cd->buffer >= curr_page_addr) && 897 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE)) 898 break; 899 } 900 901 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) { 902 /* encode entry in current page */ 903 904 p = encode_entry_baggage(cd, p, name, namlen, ino); 905 906 /* throw in readdirplus baggage */ 907 if (plus) { 908 struct svc_fh fh; 909 910 if (compose_entry_fh(cd, &fh, name, namlen) > 0) { 911 *p++ = 0; 912 *p++ = 0; 913 } else 914 p = encode_entryplus_baggage(cd, p, &fh); 915 } 916 num_entry_words = p - cd->buffer; 917 } else if (cd->rqstp->rq_respages[pn+1] != NULL) { 918 /* temporarily encode entry into next page, then move back to 919 * current and next page in rq_respages[] */ 920 u32 *p1, *tmp; 921 int len1, len2; 922 923 /* grab next page for temporary storage of entry */ 924 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]); 925 926 p1 = encode_entry_baggage(cd, p1, name, namlen, ino); 927 928 /* throw in readdirplus baggage */ 929 if (plus) { 930 struct svc_fh fh; 931 932 if (compose_entry_fh(cd, &fh, name, namlen) > 0) { 933 /* zero out the filehandle */ 934 *p1++ = 0; 935 *p1++ = 0; 936 } else 937 p1 = encode_entryplus_baggage(cd, p1, &fh); 938 } 939 940 /* determine entry word length and lengths to go in pages */ 941 num_entry_words = p1 - tmp; 942 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer; 943 if ((num_entry_words << 2) < len1) { 944 /* the actual number of words in the entry is less 945 * than elen and can still fit in the current page 946 */ 947 memmove(p, tmp, num_entry_words << 2); 948 p += num_entry_words; 949 950 /* update offset */ 951 cd->offset = cd->buffer + (cd->offset - tmp); 952 } else { 953 unsigned int offset_r = (cd->offset - tmp) << 2; 954 955 /* update pointer to offset location. 956 * This is a 64bit quantity, so we need to 957 * deal with 3 cases: 958 * - entirely in first page 959 * - entirely in second page 960 * - 4 bytes in each page 961 */ 962 if (offset_r + 8 <= len1) { 963 cd->offset = p + (cd->offset - tmp); 964 } else if (offset_r >= len1) { 965 cd->offset -= len1 >> 2; 966 } else { 967 /* sitting on the fence */ 968 BUG_ON(offset_r != len1 - 4); 969 cd->offset = p + (cd->offset - tmp); 970 cd->offset1 = tmp; 971 } 972 973 len2 = (num_entry_words << 2) - len1; 974 975 /* move from temp page to current and next pages */ 976 memmove(p, tmp, len1); 977 memmove(tmp, (caddr_t)tmp+len1, len2); 978 979 p = tmp + (len2 >> 2); 980 } 981 } 982 else { 983 cd->common.err = nfserr_toosmall; 984 return -EINVAL; 985 } 986 987 cd->buflen -= num_entry_words; 988 cd->buffer = p; 989 cd->common.err = nfs_ok; 990 return 0; 991 992 } 993 994 int 995 nfs3svc_encode_entry(struct readdir_cd *cd, const char *name, 996 int namlen, loff_t offset, ino_t ino, unsigned int d_type) 997 { 998 return encode_entry(cd, name, namlen, offset, ino, d_type, 0); 999 } 1000 1001 int 1002 nfs3svc_encode_entry_plus(struct readdir_cd *cd, const char *name, 1003 int namlen, loff_t offset, ino_t ino, unsigned int d_type) 1004 { 1005 return encode_entry(cd, name, namlen, offset, ino, d_type, 1); 1006 } 1007 1008 /* FSSTAT */ 1009 int 1010 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, u32 *p, 1011 struct nfsd3_fsstatres *resp) 1012 { 1013 struct kstatfs *s = &resp->stats; 1014 u64 bs = s->f_bsize; 1015 1016 *p++ = xdr_zero; /* no post_op_attr */ 1017 1018 if (resp->status == 0) { 1019 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */ 1020 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */ 1021 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */ 1022 p = xdr_encode_hyper(p, s->f_files); /* total inodes */ 1023 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */ 1024 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */ 1025 *p++ = htonl(resp->invarsec); /* mean unchanged time */ 1026 } 1027 return xdr_ressize_check(rqstp, p); 1028 } 1029 1030 /* FSINFO */ 1031 int 1032 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, u32 *p, 1033 struct nfsd3_fsinfores *resp) 1034 { 1035 *p++ = xdr_zero; /* no post_op_attr */ 1036 1037 if (resp->status == 0) { 1038 *p++ = htonl(resp->f_rtmax); 1039 *p++ = htonl(resp->f_rtpref); 1040 *p++ = htonl(resp->f_rtmult); 1041 *p++ = htonl(resp->f_wtmax); 1042 *p++ = htonl(resp->f_wtpref); 1043 *p++ = htonl(resp->f_wtmult); 1044 *p++ = htonl(resp->f_dtpref); 1045 p = xdr_encode_hyper(p, resp->f_maxfilesize); 1046 *p++ = xdr_one; 1047 *p++ = xdr_zero; 1048 *p++ = htonl(resp->f_properties); 1049 } 1050 1051 return xdr_ressize_check(rqstp, p); 1052 } 1053 1054 /* PATHCONF */ 1055 int 1056 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, u32 *p, 1057 struct nfsd3_pathconfres *resp) 1058 { 1059 *p++ = xdr_zero; /* no post_op_attr */ 1060 1061 if (resp->status == 0) { 1062 *p++ = htonl(resp->p_link_max); 1063 *p++ = htonl(resp->p_name_max); 1064 *p++ = htonl(resp->p_no_trunc); 1065 *p++ = htonl(resp->p_chown_restricted); 1066 *p++ = htonl(resp->p_case_insensitive); 1067 *p++ = htonl(resp->p_case_preserving); 1068 } 1069 1070 return xdr_ressize_check(rqstp, p); 1071 } 1072 1073 /* COMMIT */ 1074 int 1075 nfs3svc_encode_commitres(struct svc_rqst *rqstp, u32 *p, 1076 struct nfsd3_commitres *resp) 1077 { 1078 p = encode_wcc_data(rqstp, p, &resp->fh); 1079 /* Write verifier */ 1080 if (resp->status == 0) { 1081 *p++ = htonl(nfssvc_boot.tv_sec); 1082 *p++ = htonl(nfssvc_boot.tv_usec); 1083 } 1084 return xdr_ressize_check(rqstp, p); 1085 } 1086 1087 /* 1088 * XDR release functions 1089 */ 1090 int 1091 nfs3svc_release_fhandle(struct svc_rqst *rqstp, u32 *p, 1092 struct nfsd3_attrstat *resp) 1093 { 1094 fh_put(&resp->fh); 1095 return 1; 1096 } 1097 1098 int 1099 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, u32 *p, 1100 struct nfsd3_fhandle_pair *resp) 1101 { 1102 fh_put(&resp->fh1); 1103 fh_put(&resp->fh2); 1104 return 1; 1105 } 1106