fs/nfsd/nfs3xdr.c

   1 /*
   2  * XDR support for nfsd/protocol version 3.
   3  *
   4  * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
   5  *
   6  * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
   7  */
   8
   9 #include <linux/namei.h>
  10 #include <linux/sunrpc/svc_xprt.h>
  11 #include "xdr3.h"
  12 #include "auth.h"
  13 #include "netns.h"
  14 #include "vfs.h"
  15
  16 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  17
  18
  19 /*
  20  * Mapping of S_IF* types to NFS file types
  21  */
  22 static u32      nfs3_ftypes[] = {
  23         NF3NON,  NF3FIFO, NF3CHR, NF3BAD,
  24         NF3DIR,  NF3BAD,  NF3BLK, NF3BAD,
  25         NF3REG,  NF3BAD,  NF3LNK, NF3BAD,
  26         NF3SOCK, NF3BAD,  NF3LNK, NF3BAD,
  27 };
  28
  29 /*
  30  * XDR functions for basic NFS types
  31  */
  32 static __be32 *
  33 encode_time3(__be32 *p, struct timespec *time)
  34 {
  35         *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
  36         return p;
  37 }
  38
  39 static __be32 *
  40 decode_time3(__be32 *p, struct timespec *time)
  41 {
  42         time->tv_sec = ntohl(*p++);
  43         time->tv_nsec = ntohl(*p++);
  44         return p;
  45 }
  46
  47 static __be32 *
  48 decode_fh(__be32 *p, struct svc_fh *fhp)
  49 {
  50         unsigned int size;
  51         fh_init(fhp, NFS3_FHSIZE);
  52         size = ntohl(*p++);
  53         if (size > NFS3_FHSIZE)
  54                 return NULL;
  55
  56         memcpy(&fhp->fh_handle.fh_base, p, size);
  57         fhp->fh_handle.fh_size = size;
  58         return p + XDR_QUADLEN(size);
  59 }
  60
  61 /* Helper function for NFSv3 ACL code */
  62 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
  63 {
  64         return decode_fh(p, fhp);
  65 }
  66
  67 static __be32 *
  68 encode_fh(__be32 *p, struct svc_fh *fhp)
  69 {
  70         unsigned int size = fhp->fh_handle.fh_size;
  71         *p++ = htonl(size);
  72         if (size) p[XDR_QUADLEN(size)-1]=0;
  73         memcpy(p, &fhp->fh_handle.fh_base, size);
  74         return p + XDR_QUADLEN(size);
  75 }
  76
  77 /*
  78  * Decode a file name and make sure that the path contains
  79  * no slashes or null bytes.
  80  */
  81 static __be32 *
  82 decode_filename(__be32 *p, char **namp, unsigned int *lenp)
  83 {
  84         char            *name;
  85         unsigned int    i;
  86
  87         if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
  88                 for (i = 0, name = *namp; i < *lenp; i++, name++) {
  89                         if (*name == '\0' || *name == '/')
  90                                 return NULL;
  91                 }
  92         }
  93
  94         return p;
  95 }
  96
  97 static __be32 *
  98 decode_sattr3(__be32 *p, struct iattr *iap)
  99 {
 100         u32     tmp;
 101
 102         iap->ia_valid = 0;
 103
 104         if (*p++) {
 105                 iap->ia_valid |= ATTR_MODE;
 106                 iap->ia_mode = ntohl(*p++);
 107         }
 108         if (*p++) {
 109                 iap->ia_uid = make_kuid(&init_user_ns, ntohl(*p++));
 110                 if (uid_valid(iap->ia_uid))
 111                         iap->ia_valid |= ATTR_UID;
 112         }
 113         if (*p++) {
 114                 iap->ia_gid = make_kgid(&init_user_ns, ntohl(*p++));
 115                 if (gid_valid(iap->ia_gid))
 116                         iap->ia_valid |= ATTR_GID;
 117         }
 118         if (*p++) {
 119                 u64     newsize;
 120
 121                 iap->ia_valid |= ATTR_SIZE;
 122                 p = xdr_decode_hyper(p, &newsize);
 123                 iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
 124         }
 125         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 126                 iap->ia_valid |= ATTR_ATIME;
 127         } else if (tmp == 2) {          /* set to client time */
 128                 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
 129                 iap->ia_atime.tv_sec = ntohl(*p++);
 130                 iap->ia_atime.tv_nsec = ntohl(*p++);
 131         }
 132         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 133                 iap->ia_valid |= ATTR_MTIME;
 134         } else if (tmp == 2) {          /* set to client time */
 135                 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
 136                 iap->ia_mtime.tv_sec = ntohl(*p++);
 137                 iap->ia_mtime.tv_nsec = ntohl(*p++);
 138         }
 139         return p;
 140 }
 141
 142 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
 143 {
 144         u64 f;
 145         switch(fsid_source(fhp)) {
 146         default:
 147         case FSIDSOURCE_DEV:
 148                 p = xdr_encode_hyper(p, (u64)huge_encode_dev
 149                                      (d_inode(fhp->fh_dentry)->i_sb->s_dev));
 150                 break;
 151         case FSIDSOURCE_FSID:
 152                 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
 153                 break;
 154         case FSIDSOURCE_UUID:
 155                 f = ((u64*)fhp->fh_export->ex_uuid)[0];
 156                 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
 157                 p = xdr_encode_hyper(p, f);
 158                 break;
 159         }
 160         return p;
 161 }
 162
 163 static __be32 *
 164 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
 165               struct kstat *stat)
 166 {
 167         *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
 168         *p++ = htonl((u32) (stat->mode & S_IALLUGO));
 169         *p++ = htonl((u32) stat->nlink);
 170         *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
 171         *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
 172         if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
 173                 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
 174         } else {
 175                 p = xdr_encode_hyper(p, (u64) stat->size);
 176         }
 177         p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
 178         *p++ = htonl((u32) MAJOR(stat->rdev));
 179         *p++ = htonl((u32) MINOR(stat->rdev));
 180         p = encode_fsid(p, fhp);
 181         p = xdr_encode_hyper(p, stat->ino);
 182         p = encode_time3(p, &stat->atime);
 183         p = encode_time3(p, &stat->mtime);
 184         p = encode_time3(p, &stat->ctime);
 185
 186         return p;
 187 }
 188
 189 static __be32 *
 190 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 191 {
 192         /* Attributes to follow */
 193         *p++ = xdr_one;
 194         return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
 195 }
 196
 197 /*
 198  * Encode post-operation attributes.
 199  * The inode may be NULL if the call failed because of a stale file
 200  * handle. In this case, no attributes are returned.
 201  */
 202 static __be32 *
 203 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 204 {
 205         struct dentry *dentry = fhp->fh_dentry;
 206         if (dentry && d_really_is_positive(dentry)) {
 207                 __be32 err;
 208                 struct kstat stat;
 209
 210                 err = fh_getattr(fhp, &stat);
 211                 if (!err) {
 212                         *p++ = xdr_one;         /* attributes follow */
 213                         lease_get_mtime(d_inode(dentry), &stat.mtime);
 214                         return encode_fattr3(rqstp, p, fhp, &stat);
 215                 }
 216         }
 217         *p++ = xdr_zero;
 218         return p;
 219 }
 220
 221 /* Helper for NFSv3 ACLs */
 222 __be32 *
 223 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 224 {
 225         return encode_post_op_attr(rqstp, p, fhp);
 226 }
 227
 228 /*
 229  * Enocde weak cache consistency data
 230  */
 231 static __be32 *
 232 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 233 {
 234         struct dentry   *dentry = fhp->fh_dentry;
 235
 236         if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
 237                 if (fhp->fh_pre_saved) {
 238                         *p++ = xdr_one;
 239                         p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
 240                         p = encode_time3(p, &fhp->fh_pre_mtime);
 241                         p = encode_time3(p, &fhp->fh_pre_ctime);
 242                 } else {
 243                         *p++ = xdr_zero;
 244                 }
 245                 return encode_saved_post_attr(rqstp, p, fhp);
 246         }
 247         /* no pre- or post-attrs */
 248         *p++ = xdr_zero;
 249         return encode_post_op_attr(rqstp, p, fhp);
 250 }
 251
 252 /*
 253  * Fill in the post_op attr for the wcc data
 254  */
 255 void fill_post_wcc(struct svc_fh *fhp)
 256 {
 257         __be32 err;
 258
 259         if (fhp->fh_post_saved)
 260                 printk("nfsd: inode locked twice during operation.\n");
 261
 262         err = fh_getattr(fhp, &fhp->fh_post_attr);
 263         fhp->fh_post_change = d_inode(fhp->fh_dentry)->i_version;
 264         if (err) {
 265                 fhp->fh_post_saved = false;
 266                 /* Grab the ctime anyway - set_change_info might use it */
 267                 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
 268         } else
 269                 fhp->fh_post_saved = true;
 270 }
 271
 272 /*
 273  * XDR decode functions
 274  */
 275 int
 276 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
 277 {
 278         p = decode_fh(p, &args->fh);
 279         if (!p)
 280                 return 0;
 281         return xdr_argsize_check(rqstp, p);
 282 }
 283
 284 int
 285 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
 286                                         struct nfsd3_sattrargs *args)
 287 {
 288         p = decode_fh(p, &args->fh);
 289         if (!p)
 290                 return 0;
 291         p = decode_sattr3(p, &args->attrs);
 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, __be32 *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, __be32 *p,
 315                                         struct nfsd3_accessargs *args)
 316 {
 317         p = decode_fh(p, &args->fh);
 318         if (!p)
 319                 return 0;
 320         args->access = ntohl(*p++);
 321
 322         return xdr_argsize_check(rqstp, p);
 323 }
 324
 325 int
 326 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
 327                                         struct nfsd3_readargs *args)
 328 {
 329         unsigned int len;
 330         int v;
 331         u32 max_blocksize = svc_max_payload(rqstp);
 332
 333         p = decode_fh(p, &args->fh);
 334         if (!p)
 335                 return 0;
 336         p = xdr_decode_hyper(p, &args->offset);
 337
 338         args->count = ntohl(*p++);
 339         len = min(args->count, max_blocksize);
 340
 341         /* set up the kvec */
 342         v=0;
 343         while (len > 0) {
 344                 struct page *p = *(rqstp->rq_next_page++);
 345
 346                 rqstp->rq_vec[v].iov_base = page_address(p);
 347                 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
 348                 len -= rqstp->rq_vec[v].iov_len;
 349                 v++;
 350         }
 351         args->vlen = v;
 352         return xdr_argsize_check(rqstp, p);
 353 }
 354
 355 int
 356 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
 357                                         struct nfsd3_writeargs *args)
 358 {
 359         unsigned int len, v, hdr, dlen;
 360         u32 max_blocksize = svc_max_payload(rqstp);
 361         struct kvec *head = rqstp->rq_arg.head;
 362
 363         p = decode_fh(p, &args->fh);
 364         if (!p)
 365                 return 0;
 366         p = xdr_decode_hyper(p, &args->offset);
 367
 368         args->count = ntohl(*p++);
 369         args->stable = ntohl(*p++);
 370         len = args->len = ntohl(*p++);
 371         if ((void *)p > head->iov_base + head->iov_len)
 372                 return 0;
 373         /*
 374          * The count must equal the amount of data passed.
 375          */
 376         if (args->count != args->len)
 377                 return 0;
 378
 379         /*
 380          * Check to make sure that we got the right number of
 381          * bytes.
 382          */
 383         hdr = (void*)p - head->iov_base;
 384         dlen = head->iov_len + rqstp->rq_arg.page_len - hdr;
 385         /*
 386          * Round the length of the data which was specified up to
 387          * the next multiple of XDR units and then compare that
 388          * against the length which was actually received.
 389          * Note that when RPCSEC/GSS (for example) is used, the
 390          * data buffer can be padded so dlen might be larger
 391          * than required.  It must never be smaller.
 392          */
 393         if (dlen < XDR_QUADLEN(len)*4)
 394                 return 0;
 395
 396         if (args->count > max_blocksize) {
 397                 args->count = max_blocksize;
 398                 len = args->len = max_blocksize;
 399         }
 400         rqstp->rq_vec[0].iov_base = (void*)p;
 401         rqstp->rq_vec[0].iov_len = head->iov_len - hdr;
 402         v = 0;
 403         while (len > rqstp->rq_vec[v].iov_len) {
 404                 len -= rqstp->rq_vec[v].iov_len;
 405                 v++;
 406                 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
 407                 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 408         }
 409         rqstp->rq_vec[v].iov_len = len;
 410         args->vlen = v + 1;
 411         return 1;
 412 }
 413
 414 int
 415 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *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                 return 0;
 421
 422         switch (args->createmode = ntohl(*p++)) {
 423         case NFS3_CREATE_UNCHECKED:
 424         case NFS3_CREATE_GUARDED:
 425                 p = decode_sattr3(p, &args->attrs);
 426                 break;
 427         case NFS3_CREATE_EXCLUSIVE:
 428                 args->verf = p;
 429                 p += 2;
 430                 break;
 431         default:
 432                 return 0;
 433         }
 434
 435         return xdr_argsize_check(rqstp, p);
 436 }
 437 int
 438 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
 439                                         struct nfsd3_createargs *args)
 440 {
 441         if (!(p = decode_fh(p, &args->fh)) ||
 442             !(p = decode_filename(p, &args->name, &args->len)))
 443                 return 0;
 444         p = decode_sattr3(p, &args->attrs);
 445
 446         return xdr_argsize_check(rqstp, p);
 447 }
 448
 449 int
 450 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
 451                                         struct nfsd3_symlinkargs *args)
 452 {
 453         unsigned int len, 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 = page_address(*(rqstp->rq_next_page++));
 472         args->tlen = len;
 473         /* first copy and check from the first page */
 474         old = (char*)p;
 475         vec = &rqstp->rq_arg.head[0];
 476         if ((void *)old > vec->iov_base + vec->iov_len)
 477                 return 0;
 478         avail = vec->iov_len - (old - (char*)vec->iov_base);
 479         while (len && avail && *old) {
 480                 *new++ = *old++;
 481                 len--;
 482                 avail--;
 483         }
 484         /* now copy next page if there is one */
 485         if (len && !avail && rqstp->rq_arg.page_len) {
 486                 avail = min_t(unsigned int, rqstp->rq_arg.page_len, 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         p = decode_fh(p, &args->fh);
 541         if (!p)
 542                 return 0;
 543         args->buffer = page_address(*(rqstp->rq_next_page++));
 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         p = decode_fh(p, &args->fh);
 565         if (!p)
 566                 return 0;
 567         p = xdr_decode_hyper(p, &args->cookie);
 568         args->verf   = p; p += 2;
 569         args->dircount = ~0;
 570         args->count  = ntohl(*p++);
 571         args->count  = min_t(u32, args->count, PAGE_SIZE);
 572         args->buffer = page_address(*(rqstp->rq_next_page++));
 573
 574         return xdr_argsize_check(rqstp, p);
 575 }
 576
 577 int
 578 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
 579                                         struct nfsd3_readdirargs *args)
 580 {
 581         int len;
 582         u32 max_blocksize = svc_max_payload(rqstp);
 583
 584         p = decode_fh(p, &args->fh);
 585         if (!p)
 586                 return 0;
 587         p = xdr_decode_hyper(p, &args->cookie);
 588         args->verf     = p; p += 2;
 589         args->dircount = ntohl(*p++);
 590         args->count    = ntohl(*p++);
 591
 592         len = args->count = min(args->count, max_blocksize);
 593         while (len > 0) {
 594                 struct page *p = *(rqstp->rq_next_page++);
 595                 if (!args->buffer)
 596                         args->buffer = page_address(p);
 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         p = decode_fh(p, &args->fh);
 608         if (!p)
 609                 return 0;
 610         p = xdr_decode_hyper(p, &args->offset);
 611         args->count = ntohl(*p++);
 612
 613         return xdr_argsize_check(rqstp, p);
 614 }
 615
 616 /*
 617  * XDR encode functions
 618  */
 619 /*
 620  * There must be an encoding function for void results so svc_process
 621  * will work properly.
 622  */
 623 int
 624 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 625 {
 626         return xdr_ressize_check(rqstp, p);
 627 }
 628
 629 /* GETATTR */
 630 int
 631 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
 632                                         struct nfsd3_attrstat *resp)
 633 {
 634         if (resp->status == 0) {
 635                 lease_get_mtime(d_inode(resp->fh.fh_dentry),
 636                                 &resp->stat.mtime);
 637                 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
 638         }
 639         return xdr_ressize_check(rqstp, p);
 640 }
 641
 642 /* SETATTR, REMOVE, RMDIR */
 643 int
 644 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
 645                                         struct nfsd3_attrstat *resp)
 646 {
 647         p = encode_wcc_data(rqstp, p, &resp->fh);
 648         return xdr_ressize_check(rqstp, p);
 649 }
 650
 651 /* LOOKUP */
 652 int
 653 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
 654                                         struct nfsd3_diropres *resp)
 655 {
 656         if (resp->status == 0) {
 657                 p = encode_fh(p, &resp->fh);
 658                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 659         }
 660         p = encode_post_op_attr(rqstp, p, &resp->dirfh);
 661         return xdr_ressize_check(rqstp, p);
 662 }
 663
 664 /* ACCESS */
 665 int
 666 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
 667                                         struct nfsd3_accessres *resp)
 668 {
 669         p = encode_post_op_attr(rqstp, p, &resp->fh);
 670         if (resp->status == 0)
 671                 *p++ = htonl(resp->access);
 672         return xdr_ressize_check(rqstp, p);
 673 }
 674
 675 /* READLINK */
 676 int
 677 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
 678                                         struct nfsd3_readlinkres *resp)
 679 {
 680         p = encode_post_op_attr(rqstp, p, &resp->fh);
 681         if (resp->status == 0) {
 682                 *p++ = htonl(resp->len);
 683                 xdr_ressize_check(rqstp, p);
 684                 rqstp->rq_res.page_len = resp->len;
 685                 if (resp->len & 3) {
 686                         /* need to pad the tail */
 687                         rqstp->rq_res.tail[0].iov_base = p;
 688                         *p = 0;
 689                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
 690                 }
 691                 return 1;
 692         } else
 693                 return xdr_ressize_check(rqstp, p);
 694 }
 695
 696 /* READ */
 697 int
 698 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
 699                                         struct nfsd3_readres *resp)
 700 {
 701         p = encode_post_op_attr(rqstp, p, &resp->fh);
 702         if (resp->status == 0) {
 703                 *p++ = htonl(resp->count);
 704                 *p++ = htonl(resp->eof);
 705                 *p++ = htonl(resp->count);      /* xdr opaque count */
 706                 xdr_ressize_check(rqstp, p);
 707                 /* now update rqstp->rq_res to reflect data as well */
 708                 rqstp->rq_res.page_len = resp->count;
 709                 if (resp->count & 3) {
 710                         /* need to pad the tail */
 711                         rqstp->rq_res.tail[0].iov_base = p;
 712                         *p = 0;
 713                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
 714                 }
 715                 return 1;
 716         } else
 717                 return xdr_ressize_check(rqstp, p);
 718 }
 719
 720 /* WRITE */
 721 int
 722 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
 723                                         struct nfsd3_writeres *resp)
 724 {
 725         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 726
 727         p = encode_wcc_data(rqstp, p, &resp->fh);
 728         if (resp->status == 0) {
 729                 *p++ = htonl(resp->count);
 730                 *p++ = htonl(resp->committed);
 731                 *p++ = htonl(nn->nfssvc_boot.tv_sec);
 732                 *p++ = htonl(nn->nfssvc_boot.tv_usec);
 733         }
 734         return xdr_ressize_check(rqstp, p);
 735 }
 736
 737 /* CREATE, MKDIR, SYMLINK, MKNOD */
 738 int
 739 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
 740                                         struct nfsd3_diropres *resp)
 741 {
 742         if (resp->status == 0) {
 743                 *p++ = xdr_one;
 744                 p = encode_fh(p, &resp->fh);
 745                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 746         }
 747         p = encode_wcc_data(rqstp, p, &resp->dirfh);
 748         return xdr_ressize_check(rqstp, p);
 749 }
 750
 751 /* RENAME */
 752 int
 753 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
 754                                         struct nfsd3_renameres *resp)
 755 {
 756         p = encode_wcc_data(rqstp, p, &resp->ffh);
 757         p = encode_wcc_data(rqstp, p, &resp->tfh);
 758         return xdr_ressize_check(rqstp, p);
 759 }
 760
 761 /* LINK */
 762 int
 763 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
 764                                         struct nfsd3_linkres *resp)
 765 {
 766         p = encode_post_op_attr(rqstp, p, &resp->fh);
 767         p = encode_wcc_data(rqstp, p, &resp->tfh);
 768         return xdr_ressize_check(rqstp, p);
 769 }
 770
 771 /* READDIR */
 772 int
 773 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
 774                                         struct nfsd3_readdirres *resp)
 775 {
 776         p = encode_post_op_attr(rqstp, p, &resp->fh);
 777
 778         if (resp->status == 0) {
 779                 /* stupid readdir cookie */
 780                 memcpy(p, resp->verf, 8); p += 2;
 781                 xdr_ressize_check(rqstp, p);
 782                 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
 783                         return 1; /*No room for trailer */
 784                 rqstp->rq_res.page_len = (resp->count) << 2;
 785
 786                 /* add the 'tail' to the end of the 'head' page - page 0. */
 787                 rqstp->rq_res.tail[0].iov_base = p;
 788                 *p++ = 0;               /* no more entries */
 789                 *p++ = htonl(resp->common.err == nfserr_eof);
 790                 rqstp->rq_res.tail[0].iov_len = 2<<2;
 791                 return 1;
 792         } else
 793                 return xdr_ressize_check(rqstp, p);
 794 }
 795
 796 static __be32 *
 797 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
 798              int namlen, u64 ino)
 799 {
 800         *p++ = xdr_one;                          /* mark entry present */
 801         p    = xdr_encode_hyper(p, ino);         /* file id */
 802         p    = xdr_encode_array(p, name, namlen);/* name length & name */
 803
 804         cd->offset = p;                         /* remember pointer */
 805         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
 806
 807         return p;
 808 }
 809
 810 static __be32
 811 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
 812                  const char *name, int namlen, u64 ino)
 813 {
 814         struct svc_export       *exp;
 815         struct dentry           *dparent, *dchild;
 816         __be32 rv = nfserr_noent;
 817
 818         dparent = cd->fh.fh_dentry;
 819         exp  = cd->fh.fh_export;
 820
 821         if (isdotent(name, namlen)) {
 822                 if (namlen == 2) {
 823                         dchild = dget_parent(dparent);
 824                         /* filesystem root - cannot return filehandle for ".." */
 825                         if (dchild == dparent)
 826                                 goto out;
 827                 } else
 828                         dchild = dget(dparent);
 829         } else
 830                 dchild = lookup_one_len(name, dparent, namlen);
 831         if (IS_ERR(dchild))
 832                 return rv;
 833         if (d_mountpoint(dchild))
 834                 goto out;
 835         if (d_really_is_negative(dchild))
 836                 goto out;
 837         if (dchild->d_inode->i_ino != ino)
 838                 goto out;
 839         rv = fh_compose(fhp, exp, dchild, &cd->fh);
 840 out:
 841         dput(dchild);
 842         return rv;
 843 }
 844
 845 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
 846 {
 847         struct svc_fh   *fh = &cd->scratch;
 848         __be32 err;
 849
 850         fh_init(fh, NFS3_FHSIZE);
 851         err = compose_entry_fh(cd, fh, name, namlen, ino);
 852         if (err) {
 853                 *p++ = 0;
 854                 *p++ = 0;
 855                 goto out;
 856         }
 857         p = encode_post_op_attr(cd->rqstp, p, fh);
 858         *p++ = xdr_one;                 /* yes, a file handle follows */
 859         p = encode_fh(p, fh);
 860 out:
 861         fh_put(fh);
 862         return p;
 863 }
 864
 865 /*
 866  * Encode a directory entry. This one works for both normal readdir
 867  * and readdirplus.
 868  * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
 869  * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
 870  *
 871  * The readdirplus baggage is 1+21 words for post_op_attr, plus the
 872  * file handle.
 873  */
 874
 875 #define NFS3_ENTRY_BAGGAGE      (2 + 1 + 2 + 1)
 876 #define NFS3_ENTRYPLUS_BAGGAGE  (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
 877 static int
 878 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
 879              loff_t offset, u64 ino, unsigned int d_type, int plus)
 880 {
 881         struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
 882                                                         common);
 883         __be32          *p = cd->buffer;
 884         caddr_t         curr_page_addr = NULL;
 885         struct page **  page;
 886         int             slen;           /* string (name) length */
 887         int             elen;           /* estimated entry length in words */
 888         int             num_entry_words = 0;    /* actual number of words */
 889
 890         if (cd->offset) {
 891                 u64 offset64 = offset;
 892
 893                 if (unlikely(cd->offset1)) {
 894                         /* we ended up with offset on a page boundary */
 895                         *cd->offset = htonl(offset64 >> 32);
 896                         *cd->offset1 = htonl(offset64 & 0xffffffff);
 897                         cd->offset1 = NULL;
 898                 } else {
 899                         xdr_encode_hyper(cd->offset, offset64);
 900                 }
 901         }
 902
 903         /*
 904         dprintk("encode_entry(%.*s @%ld%s)\n",
 905                 namlen, name, (long) offset, plus? " plus" : "");
 906          */
 907
 908         /* truncate filename if too long */
 909         namlen = min(namlen, NFS3_MAXNAMLEN);
 910
 911         slen = XDR_QUADLEN(namlen);
 912         elen = slen + NFS3_ENTRY_BAGGAGE
 913                 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
 914
 915         if (cd->buflen < elen) {
 916                 cd->common.err = nfserr_toosmall;
 917                 return -EINVAL;
 918         }
 919
 920         /* determine which page in rq_respages[] we are currently filling */
 921         for (page = cd->rqstp->rq_respages + 1;
 922                                 page < cd->rqstp->rq_next_page; page++) {
 923                 curr_page_addr = page_address(*page);
 924
 925                 if (((caddr_t)cd->buffer >= curr_page_addr) &&
 926                     ((caddr_t)cd->buffer <  curr_page_addr + PAGE_SIZE))
 927                         break;
 928         }
 929
 930         if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
 931                 /* encode entry in current page */
 932
 933                 p = encode_entry_baggage(cd, p, name, namlen, ino);
 934
 935                 if (plus)
 936                         p = encode_entryplus_baggage(cd, p, name, namlen, ino);
 937                 num_entry_words = p - cd->buffer;
 938         } else if (*(page+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(*(page+1));
 946
 947                 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
 948
 949                 if (plus)
 950                         p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
 951
 952                 /* determine entry word length and lengths to go in pages */
 953                 num_entry_words = p1 - tmp;
 954                 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
 955                 if ((num_entry_words << 2) < len1) {
 956                         /* the actual number of words in the entry is less
 957                          * than elen and can still fit in the current page
 958                          */
 959                         memmove(p, tmp, num_entry_words << 2);
 960                         p += num_entry_words;
 961
 962                         /* update offset */
 963                         cd->offset = cd->buffer + (cd->offset - tmp);
 964                 } else {
 965                         unsigned int offset_r = (cd->offset - tmp) << 2;
 966
 967                         /* update pointer to offset location.
 968                          * This is a 64bit quantity, so we need to
 969                          * deal with 3 cases:
 970                          *  -   entirely in first page
 971                          *  -   entirely in second page
 972                          *  -   4 bytes in each page
 973                          */
 974                         if (offset_r + 8 <= len1) {
 975                                 cd->offset = p + (cd->offset - tmp);
 976                         } else if (offset_r >= len1) {
 977                                 cd->offset -= len1 >> 2;
 978                         } else {
 979                                 /* sitting on the fence */
 980                                 BUG_ON(offset_r != len1 - 4);
 981                                 cd->offset = p + (cd->offset - tmp);
 982                                 cd->offset1 = tmp;
 983                         }
 984
 985                         len2 = (num_entry_words << 2) - len1;
 986
 987                         /* move from temp page to current and next pages */
 988                         memmove(p, tmp, len1);
 989                         memmove(tmp, (caddr_t)tmp+len1, len2);
 990
 991                         p = tmp + (len2 >> 2);
 992                 }
 993         }
 994         else {
 995                 cd->common.err = nfserr_toosmall;
 996                 return -EINVAL;
 997         }
 998
 999         cd->buflen -= num_entry_words;
1000         cd->buffer = p;
1001         cd->common.err = nfs_ok;
1002         return 0;
1003
1004 }
1005
1006 int
1007 nfs3svc_encode_entry(void *cd, const char *name,
1008                      int namlen, loff_t offset, u64 ino, unsigned int d_type)
1009 {
1010         return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1011 }
1012
1013 int
1014 nfs3svc_encode_entry_plus(void *cd, const char *name,
1015                           int namlen, loff_t offset, u64 ino,
1016                           unsigned int d_type)
1017 {
1018         return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1019 }
1020
1021 /* FSSTAT */
1022 int
1023 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1024                                         struct nfsd3_fsstatres *resp)
1025 {
1026         struct kstatfs  *s = &resp->stats;
1027         u64             bs = s->f_bsize;
1028
1029         *p++ = xdr_zero;        /* no post_op_attr */
1030
1031         if (resp->status == 0) {
1032                 p = xdr_encode_hyper(p, bs * s->f_blocks);      /* total bytes */
1033                 p = xdr_encode_hyper(p, bs * s->f_bfree);       /* free bytes */
1034                 p = xdr_encode_hyper(p, bs * s->f_bavail);      /* user available bytes */
1035                 p = xdr_encode_hyper(p, s->f_files);    /* total inodes */
1036                 p = xdr_encode_hyper(p, s->f_ffree);    /* free inodes */
1037                 p = xdr_encode_hyper(p, s->f_ffree);    /* user available inodes */
1038                 *p++ = htonl(resp->invarsec);   /* mean unchanged time */
1039         }
1040         return xdr_ressize_check(rqstp, p);
1041 }
1042
1043 /* FSINFO */
1044 int
1045 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1046                                         struct nfsd3_fsinfores *resp)
1047 {
1048         *p++ = xdr_zero;        /* no post_op_attr */
1049
1050         if (resp->status == 0) {
1051                 *p++ = htonl(resp->f_rtmax);
1052                 *p++ = htonl(resp->f_rtpref);
1053                 *p++ = htonl(resp->f_rtmult);
1054                 *p++ = htonl(resp->f_wtmax);
1055                 *p++ = htonl(resp->f_wtpref);
1056                 *p++ = htonl(resp->f_wtmult);
1057                 *p++ = htonl(resp->f_dtpref);
1058                 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1059                 *p++ = xdr_one;
1060                 *p++ = xdr_zero;
1061                 *p++ = htonl(resp->f_properties);
1062         }
1063
1064         return xdr_ressize_check(rqstp, p);
1065 }
1066
1067 /* PATHCONF */
1068 int
1069 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1070                                         struct nfsd3_pathconfres *resp)
1071 {
1072         *p++ = xdr_zero;        /* no post_op_attr */
1073
1074         if (resp->status == 0) {
1075                 *p++ = htonl(resp->p_link_max);
1076                 *p++ = htonl(resp->p_name_max);
1077                 *p++ = htonl(resp->p_no_trunc);
1078                 *p++ = htonl(resp->p_chown_restricted);
1079                 *p++ = htonl(resp->p_case_insensitive);
1080                 *p++ = htonl(resp->p_case_preserving);
1081         }
1082
1083         return xdr_ressize_check(rqstp, p);
1084 }
1085
1086 /* COMMIT */
1087 int
1088 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1089                                         struct nfsd3_commitres *resp)
1090 {
1091         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1092
1093         p = encode_wcc_data(rqstp, p, &resp->fh);
1094         /* Write verifier */
1095         if (resp->status == 0) {
1096                 *p++ = htonl(nn->nfssvc_boot.tv_sec);
1097                 *p++ = htonl(nn->nfssvc_boot.tv_usec);
1098         }
1099         return xdr_ressize_check(rqstp, p);
1100 }
1101
1102 /*
1103  * XDR release functions
1104  */
1105 int
1106 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1107                                         struct nfsd3_attrstat *resp)
1108 {
1109         fh_put(&resp->fh);
1110         return 1;
1111 }
1112
1113 int
1114 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
1115                                         struct nfsd3_fhandle_pair *resp)
1116 {
1117         fh_put(&resp->fh1);
1118         fh_put(&resp->fh2);
1119         return 1;
1120 }