fs/nfsd/nfs3xdr.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * XDR support for nfsd/protocol version 3.
   4  *
   5  * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
   6  *
   7  * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
   8  */
   9
  10 #include <linux/namei.h>
  11 #include <linux/sunrpc/svc_xprt.h>
  12 #include "xdr3.h"
  13 #include "auth.h"
  14 #include "netns.h"
  15 #include "vfs.h"
  16
  17 /*
  18  * Force construction of an empty post-op attr
  19  */
  20 static const struct svc_fh nfs3svc_null_fh = {
  21         .fh_no_wcc      = true,
  22 };
  23
  24 /*
  25  * time_delta. {1, 0} means the server is accurate only
  26  * to the nearest second.
  27  */
  28 static const struct timespec64 nfs3svc_time_delta = {
  29         .tv_sec         = 1,
  30         .tv_nsec        = 0,
  31 };
  32
  33 /*
  34  * Mapping of S_IF* types to NFS file types
  35  */
  36 static const u32 nfs3_ftypes[] = {
  37         NF3NON,  NF3FIFO, NF3CHR, NF3BAD,
  38         NF3DIR,  NF3BAD,  NF3BLK, NF3BAD,
  39         NF3REG,  NF3BAD,  NF3LNK, NF3BAD,
  40         NF3SOCK, NF3BAD,  NF3LNK, NF3BAD,
  41 };
  42
  43
  44 /*
  45  * Basic NFSv3 data types (RFC 1813 Sections 2.5 and 2.6)
  46  */
  47
  48 static __be32 *
  49 encode_nfstime3(__be32 *p, const struct timespec64 *time)
  50 {
  51         *p++ = cpu_to_be32((u32)time->tv_sec);
  52         *p++ = cpu_to_be32(time->tv_nsec);
  53
  54         return p;
  55 }
  56
  57 static bool
  58 svcxdr_decode_nfstime3(struct xdr_stream *xdr, struct timespec64 *timep)
  59 {
  60         __be32 *p;
  61
  62         p = xdr_inline_decode(xdr, XDR_UNIT * 2);
  63         if (!p)
  64                 return false;
  65         timep->tv_sec = be32_to_cpup(p++);
  66         timep->tv_nsec = be32_to_cpup(p);
  67
  68         return true;
  69 }
  70
  71 /**
  72  * svcxdr_decode_nfs_fh3 - Decode an NFSv3 file handle
  73  * @xdr: XDR stream positioned at an undecoded NFSv3 FH
  74  * @fhp: OUT: filled-in server file handle
  75  *
  76  * Return values:
  77  *  %false: The encoded file handle was not valid
  78  *  %true: @fhp has been initialized
  79  */
  80 bool
  81 svcxdr_decode_nfs_fh3(struct xdr_stream *xdr, struct svc_fh *fhp)
  82 {
  83         __be32 *p;
  84         u32 size;
  85
  86         if (xdr_stream_decode_u32(xdr, &size) < 0)
  87                 return false;
  88         if (size == 0 || size > NFS3_FHSIZE)
  89                 return false;
  90         p = xdr_inline_decode(xdr, size);
  91         if (!p)
  92                 return false;
  93         fh_init(fhp, NFS3_FHSIZE);
  94         fhp->fh_handle.fh_size = size;
  95         memcpy(&fhp->fh_handle.fh_base, p, size);
  96
  97         return true;
  98 }
  99
 100 /**
 101  * svcxdr_encode_nfsstat3 - Encode an NFSv3 status code
 102  * @xdr: XDR stream
 103  * @status: status value to encode
 104  *
 105  * Return values:
 106  *   %false: Send buffer space was exhausted
 107  *   %true: Success
 108  */
 109 bool
 110 svcxdr_encode_nfsstat3(struct xdr_stream *xdr, __be32 status)
 111 {
 112         __be32 *p;
 113
 114         p = xdr_reserve_space(xdr, sizeof(status));
 115         if (!p)
 116                 return false;
 117         *p = status;
 118
 119         return true;
 120 }
 121
 122 static bool
 123 svcxdr_encode_nfs_fh3(struct xdr_stream *xdr, const struct svc_fh *fhp)
 124 {
 125         u32 size = fhp->fh_handle.fh_size;
 126         __be32 *p;
 127
 128         p = xdr_reserve_space(xdr, XDR_UNIT + size);
 129         if (!p)
 130                 return false;
 131         *p++ = cpu_to_be32(size);
 132         if (size)
 133                 p[XDR_QUADLEN(size) - 1] = 0;
 134         memcpy(p, &fhp->fh_handle.fh_base, size);
 135
 136         return true;
 137 }
 138
 139 static bool
 140 svcxdr_encode_post_op_fh3(struct xdr_stream *xdr, const struct svc_fh *fhp)
 141 {
 142         if (xdr_stream_encode_item_present(xdr) < 0)
 143                 return false;
 144         if (!svcxdr_encode_nfs_fh3(xdr, fhp))
 145                 return false;
 146
 147         return true;
 148 }
 149
 150 static bool
 151 svcxdr_encode_cookieverf3(struct xdr_stream *xdr, const __be32 *verf)
 152 {
 153         __be32 *p;
 154
 155         p = xdr_reserve_space(xdr, NFS3_COOKIEVERFSIZE);
 156         if (!p)
 157                 return false;
 158         memcpy(p, verf, NFS3_COOKIEVERFSIZE);
 159
 160         return true;
 161 }
 162
 163 static bool
 164 svcxdr_encode_writeverf3(struct xdr_stream *xdr, const __be32 *verf)
 165 {
 166         __be32 *p;
 167
 168         p = xdr_reserve_space(xdr, NFS3_WRITEVERFSIZE);
 169         if (!p)
 170                 return false;
 171         memcpy(p, verf, NFS3_WRITEVERFSIZE);
 172
 173         return true;
 174 }
 175
 176 static bool
 177 svcxdr_decode_filename3(struct xdr_stream *xdr, char **name, unsigned int *len)
 178 {
 179         u32 size, i;
 180         __be32 *p;
 181         char *c;
 182
 183         if (xdr_stream_decode_u32(xdr, &size) < 0)
 184                 return false;
 185         if (size == 0 || size > NFS3_MAXNAMLEN)
 186                 return false;
 187         p = xdr_inline_decode(xdr, size);
 188         if (!p)
 189                 return false;
 190
 191         *len = size;
 192         *name = (char *)p;
 193         for (i = 0, c = *name; i < size; i++, c++) {
 194                 if (*c == '\0' || *c == '/')
 195                         return false;
 196         }
 197
 198         return true;
 199 }
 200
 201 static bool
 202 svcxdr_decode_diropargs3(struct xdr_stream *xdr, struct svc_fh *fhp,
 203                          char **name, unsigned int *len)
 204 {
 205         return svcxdr_decode_nfs_fh3(xdr, fhp) &&
 206                 svcxdr_decode_filename3(xdr, name, len);
 207 }
 208
 209 static bool
 210 svcxdr_decode_sattr3(struct svc_rqst *rqstp, struct xdr_stream *xdr,
 211                      struct iattr *iap)
 212 {
 213         u32 set_it;
 214
 215         iap->ia_valid = 0;
 216
 217         if (xdr_stream_decode_bool(xdr, &set_it) < 0)
 218                 return false;
 219         if (set_it) {
 220                 u32 mode;
 221
 222                 if (xdr_stream_decode_u32(xdr, &mode) < 0)
 223                         return false;
 224                 iap->ia_valid |= ATTR_MODE;
 225                 iap->ia_mode = mode;
 226         }
 227         if (xdr_stream_decode_bool(xdr, &set_it) < 0)
 228                 return false;
 229         if (set_it) {
 230                 u32 uid;
 231
 232                 if (xdr_stream_decode_u32(xdr, &uid) < 0)
 233                         return false;
 234                 iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), uid);
 235                 if (uid_valid(iap->ia_uid))
 236                         iap->ia_valid |= ATTR_UID;
 237         }
 238         if (xdr_stream_decode_bool(xdr, &set_it) < 0)
 239                 return false;
 240         if (set_it) {
 241                 u32 gid;
 242
 243                 if (xdr_stream_decode_u32(xdr, &gid) < 0)
 244                         return false;
 245                 iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), gid);
 246                 if (gid_valid(iap->ia_gid))
 247                         iap->ia_valid |= ATTR_GID;
 248         }
 249         if (xdr_stream_decode_bool(xdr, &set_it) < 0)
 250                 return false;
 251         if (set_it) {
 252                 u64 newsize;
 253
 254                 if (xdr_stream_decode_u64(xdr, &newsize) < 0)
 255                         return false;
 256                 iap->ia_valid |= ATTR_SIZE;
 257                 iap->ia_size = newsize;
 258         }
 259         if (xdr_stream_decode_u32(xdr, &set_it) < 0)
 260                 return false;
 261         switch (set_it) {
 262         case DONT_CHANGE:
 263                 break;
 264         case SET_TO_SERVER_TIME:
 265                 iap->ia_valid |= ATTR_ATIME;
 266                 break;
 267         case SET_TO_CLIENT_TIME:
 268                 if (!svcxdr_decode_nfstime3(xdr, &iap->ia_atime))
 269                         return false;
 270                 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
 271                 break;
 272         default:
 273                 return false;
 274         }
 275         if (xdr_stream_decode_u32(xdr, &set_it) < 0)
 276                 return false;
 277         switch (set_it) {
 278         case DONT_CHANGE:
 279                 break;
 280         case SET_TO_SERVER_TIME:
 281                 iap->ia_valid |= ATTR_MTIME;
 282                 break;
 283         case SET_TO_CLIENT_TIME:
 284                 if (!svcxdr_decode_nfstime3(xdr, &iap->ia_mtime))
 285                         return false;
 286                 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
 287                 break;
 288         default:
 289                 return false;
 290         }
 291
 292         return true;
 293 }
 294
 295 static bool
 296 svcxdr_decode_sattrguard3(struct xdr_stream *xdr, struct nfsd3_sattrargs *args)
 297 {
 298         __be32 *p;
 299         u32 check;
 300
 301         if (xdr_stream_decode_bool(xdr, &check) < 0)
 302                 return false;
 303         if (check) {
 304                 p = xdr_inline_decode(xdr, XDR_UNIT * 2);
 305                 if (!p)
 306                         return false;
 307                 args->check_guard = 1;
 308                 args->guardtime = be32_to_cpup(p);
 309         } else
 310                 args->check_guard = 0;
 311
 312         return true;
 313 }
 314
 315 static bool
 316 svcxdr_decode_specdata3(struct xdr_stream *xdr, struct nfsd3_mknodargs *args)
 317 {
 318         __be32 *p;
 319
 320         p = xdr_inline_decode(xdr, XDR_UNIT * 2);
 321         if (!p)
 322                 return false;
 323         args->major = be32_to_cpup(p++);
 324         args->minor = be32_to_cpup(p);
 325
 326         return true;
 327 }
 328
 329 static bool
 330 svcxdr_decode_devicedata3(struct svc_rqst *rqstp, struct xdr_stream *xdr,
 331                           struct nfsd3_mknodargs *args)
 332 {
 333         return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs) &&
 334                 svcxdr_decode_specdata3(xdr, args);
 335 }
 336
 337 static bool
 338 svcxdr_encode_fattr3(struct svc_rqst *rqstp, struct xdr_stream *xdr,
 339                      const struct svc_fh *fhp, const struct kstat *stat)
 340 {
 341         struct user_namespace *userns = nfsd_user_namespace(rqstp);
 342         __be32 *p;
 343         u64 fsid;
 344
 345         p = xdr_reserve_space(xdr, XDR_UNIT * 21);
 346         if (!p)
 347                 return false;
 348
 349         *p++ = cpu_to_be32(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
 350         *p++ = cpu_to_be32((u32)(stat->mode & S_IALLUGO));
 351         *p++ = cpu_to_be32((u32)stat->nlink);
 352         *p++ = cpu_to_be32((u32)from_kuid_munged(userns, stat->uid));
 353         *p++ = cpu_to_be32((u32)from_kgid_munged(userns, stat->gid));
 354         if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN)
 355                 p = xdr_encode_hyper(p, (u64)NFS3_MAXPATHLEN);
 356         else
 357                 p = xdr_encode_hyper(p, (u64)stat->size);
 358
 359         /* used */
 360         p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
 361
 362         /* rdev */
 363         *p++ = cpu_to_be32((u32)MAJOR(stat->rdev));
 364         *p++ = cpu_to_be32((u32)MINOR(stat->rdev));
 365
 366         switch(fsid_source(fhp)) {
 367         case FSIDSOURCE_FSID:
 368                 fsid = (u64)fhp->fh_export->ex_fsid;
 369                 break;
 370         case FSIDSOURCE_UUID:
 371                 fsid = ((u64 *)fhp->fh_export->ex_uuid)[0];
 372                 fsid ^= ((u64 *)fhp->fh_export->ex_uuid)[1];
 373                 break;
 374         default:
 375                 fsid = (u64)huge_encode_dev(fhp->fh_dentry->d_sb->s_dev);
 376         }
 377         p = xdr_encode_hyper(p, fsid);
 378
 379         /* fileid */
 380         p = xdr_encode_hyper(p, stat->ino);
 381
 382         p = encode_nfstime3(p, &stat->atime);
 383         p = encode_nfstime3(p, &stat->mtime);
 384         encode_nfstime3(p, &stat->ctime);
 385
 386         return true;
 387 }
 388
 389 static bool
 390 svcxdr_encode_wcc_attr(struct xdr_stream *xdr, const struct svc_fh *fhp)
 391 {
 392         __be32 *p;
 393
 394         p = xdr_reserve_space(xdr, XDR_UNIT * 6);
 395         if (!p)
 396                 return false;
 397         p = xdr_encode_hyper(p, (u64)fhp->fh_pre_size);
 398         p = encode_nfstime3(p, &fhp->fh_pre_mtime);
 399         encode_nfstime3(p, &fhp->fh_pre_ctime);
 400
 401         return true;
 402 }
 403
 404 static bool
 405 svcxdr_encode_pre_op_attr(struct xdr_stream *xdr, const struct svc_fh *fhp)
 406 {
 407         if (!fhp->fh_pre_saved) {
 408                 if (xdr_stream_encode_item_absent(xdr) < 0)
 409                         return false;
 410                 return true;
 411         }
 412
 413         if (xdr_stream_encode_item_present(xdr) < 0)
 414                 return false;
 415         return svcxdr_encode_wcc_attr(xdr, fhp);
 416 }
 417
 418 /**
 419  * svcxdr_encode_post_op_attr - Encode NFSv3 post-op attributes
 420  * @rqstp: Context of a completed RPC transaction
 421  * @xdr: XDR stream
 422  * @fhp: File handle to encode
 423  *
 424  * Return values:
 425  *   %false: Send buffer space was exhausted
 426  *   %true: Success
 427  */
 428 bool
 429 svcxdr_encode_post_op_attr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
 430                            const struct svc_fh *fhp)
 431 {
 432         struct dentry *dentry = fhp->fh_dentry;
 433         struct kstat stat;
 434
 435         /*
 436          * The inode may be NULL if the call failed because of a
 437          * stale file handle. In this case, no attributes are
 438          * returned.
 439          */
 440         if (fhp->fh_no_wcc || !dentry || !d_really_is_positive(dentry))
 441                 goto no_post_op_attrs;
 442         if (fh_getattr(fhp, &stat) != nfs_ok)
 443                 goto no_post_op_attrs;
 444
 445         if (xdr_stream_encode_item_present(xdr) < 0)
 446                 return false;
 447         lease_get_mtime(d_inode(dentry), &stat.mtime);
 448         if (!svcxdr_encode_fattr3(rqstp, xdr, fhp, &stat))
 449                 return false;
 450
 451         return true;
 452
 453 no_post_op_attrs:
 454         return xdr_stream_encode_item_absent(xdr) > 0;
 455 }
 456
 457 /*
 458  * Encode weak cache consistency data
 459  */
 460 static bool
 461 svcxdr_encode_wcc_data(struct svc_rqst *rqstp, struct xdr_stream *xdr,
 462                        const struct svc_fh *fhp)
 463 {
 464         struct dentry *dentry = fhp->fh_dentry;
 465
 466         if (!dentry || !d_really_is_positive(dentry) || !fhp->fh_post_saved)
 467                 goto neither;
 468
 469         /* before */
 470         if (!svcxdr_encode_pre_op_attr(xdr, fhp))
 471                 return false;
 472
 473         /* after */
 474         if (xdr_stream_encode_item_present(xdr) < 0)
 475                 return false;
 476         if (!svcxdr_encode_fattr3(rqstp, xdr, fhp, &fhp->fh_post_attr))
 477                 return false;
 478
 479         return true;
 480
 481 neither:
 482         if (xdr_stream_encode_item_absent(xdr) < 0)
 483                 return false;
 484         if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp))
 485                 return false;
 486
 487         return true;
 488 }
 489
 490 /*
 491  * Fill in the pre_op attr for the wcc data
 492  */
 493 void fill_pre_wcc(struct svc_fh *fhp)
 494 {
 495         struct inode    *inode;
 496         struct kstat    stat;
 497         bool v4 = (fhp->fh_maxsize == NFS4_FHSIZE);
 498         __be32 err;
 499
 500         if (fhp->fh_no_wcc || fhp->fh_pre_saved)
 501                 return;
 502         inode = d_inode(fhp->fh_dentry);
 503         err = fh_getattr(fhp, &stat);
 504         if (err) {
 505                 /* Grab the times from inode anyway */
 506                 stat.mtime = inode->i_mtime;
 507                 stat.ctime = inode->i_ctime;
 508                 stat.size  = inode->i_size;
 509         }
 510         if (v4)
 511                 fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode);
 512
 513         fhp->fh_pre_mtime = stat.mtime;
 514         fhp->fh_pre_ctime = stat.ctime;
 515         fhp->fh_pre_size  = stat.size;
 516         fhp->fh_pre_saved = true;
 517 }
 518
 519 /*
 520  * Fill in the post_op attr for the wcc data
 521  */
 522 void fill_post_wcc(struct svc_fh *fhp)
 523 {
 524         bool v4 = (fhp->fh_maxsize == NFS4_FHSIZE);
 525         struct inode *inode = d_inode(fhp->fh_dentry);
 526         __be32 err;
 527
 528         if (fhp->fh_no_wcc)
 529                 return;
 530
 531         if (fhp->fh_post_saved)
 532                 printk("nfsd: inode locked twice during operation.\n");
 533
 534         err = fh_getattr(fhp, &fhp->fh_post_attr);
 535         if (err) {
 536                 fhp->fh_post_saved = false;
 537                 fhp->fh_post_attr.ctime = inode->i_ctime;
 538         } else
 539                 fhp->fh_post_saved = true;
 540         if (v4)
 541                 fhp->fh_post_change =
 542                         nfsd4_change_attribute(&fhp->fh_post_attr, inode);
 543 }
 544
 545 /*
 546  * XDR decode functions
 547  */
 548
 549 int
 550 nfs3svc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p)
 551 {
 552         struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 553         struct nfsd_fhandle *args = rqstp->rq_argp;
 554
 555         return svcxdr_decode_nfs_fh3(xdr, &args->fh);
 556 }
 557
 558 int
 559 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
 560 {
 561         struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 562         struct nfsd3_sattrargs *args = rqstp->rq_argp;
 563
 564         return svcxdr_decode_nfs_fh3(xdr, &args->fh) &&
 565                 svcxdr_decode_sattr3(rqstp, xdr, &args->attrs) &&
 566                 svcxdr_decode_sattrguard3(xdr, args);
 567 }
 568
 569 int
 570 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
 571 {
 572         struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 573         struct nfsd3_diropargs *args = rqstp->rq_argp;
 574
 575         return svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len);
 576 }
 577
 578 int
 579 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
 580 {
 581         struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 582         struct nfsd3_accessargs *args = rqstp->rq_argp;
 583
 584         if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
 585                 return 0;
 586         if (xdr_stream_decode_u32(xdr, &args->access) < 0)
 587                 return 0;
 588
 589         return 1;
 590 }
 591
 592 int
 593 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
 594 {
 595         struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 596         struct nfsd3_readargs *args = rqstp->rq_argp;
 597
 598         if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
 599                 return 0;
 600         if (xdr_stream_decode_u64(xdr, &args->offset) < 0)
 601                 return 0;
 602         if (xdr_stream_decode_u32(xdr, &args->count) < 0)
 603                 return 0;
 604
 605         return 1;
 606 }
 607
 608 int
 609 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
 610 {
 611         struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 612         struct nfsd3_writeargs *args = rqstp->rq_argp;
 613         u32 max_blocksize = svc_max_payload(rqstp);
 614
 615         if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
 616                 return 0;
 617         if (xdr_stream_decode_u64(xdr, &args->offset) < 0)
 618                 return 0;
 619         if (xdr_stream_decode_u32(xdr, &args->count) < 0)
 620                 return 0;
 621         if (xdr_stream_decode_u32(xdr, &args->stable) < 0)
 622                 return 0;
 623
 624         /* opaque data */
 625         if (xdr_stream_decode_u32(xdr, &args->len) < 0)
 626                 return 0;
 627
 628         /* request sanity */
 629         if (args->count != args->len)
 630                 return 0;
 631         if (args->count > max_blocksize) {
 632                 args->count = max_blocksize;
 633                 args->len = max_blocksize;
 634         }
 635         if (!xdr_stream_subsegment(xdr, &args->payload, args->count))
 636                 return 0;
 637
 638         return 1;
 639 }
 640
 641 int
 642 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
 643 {
 644         struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 645         struct nfsd3_createargs *args = rqstp->rq_argp;
 646
 647         if (!svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len))
 648                 return 0;
 649         if (xdr_stream_decode_u32(xdr, &args->createmode) < 0)
 650                 return 0;
 651         switch (args->createmode) {
 652         case NFS3_CREATE_UNCHECKED:
 653         case NFS3_CREATE_GUARDED:
 654                 return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs);
 655         case NFS3_CREATE_EXCLUSIVE:
 656                 args->verf = xdr_inline_decode(xdr, NFS3_CREATEVERFSIZE);
 657                 if (!args->verf)
 658                         return 0;
 659                 break;
 660         default:
 661                 return 0;
 662         }
 663         return 1;
 664 }
 665
 666 int
 667 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
 668 {
 669         struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 670         struct nfsd3_createargs *args = rqstp->rq_argp;
 671
 672         return svcxdr_decode_diropargs3(xdr, &args->fh,
 673                                         &args->name, &args->len) &&
 674                 svcxdr_decode_sattr3(rqstp, xdr, &args->attrs);
 675 }
 676
 677 int
 678 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
 679 {
 680         struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 681         struct nfsd3_symlinkargs *args = rqstp->rq_argp;
 682         struct kvec *head = rqstp->rq_arg.head;
 683         struct kvec *tail = rqstp->rq_arg.tail;
 684         size_t remaining;
 685
 686         if (!svcxdr_decode_diropargs3(xdr, &args->ffh, &args->fname, &args->flen))
 687                 return 0;
 688         if (!svcxdr_decode_sattr3(rqstp, xdr, &args->attrs))
 689                 return 0;
 690         if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
 691                 return 0;
 692
 693         /* request sanity */
 694         remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len;
 695         remaining -= xdr_stream_pos(xdr);
 696         if (remaining < xdr_align_size(args->tlen))
 697                 return 0;
 698
 699         args->first.iov_base = xdr->p;
 700         args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
 701
 702         return 1;
 703 }
 704
 705 int
 706 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
 707 {
 708         struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 709         struct nfsd3_mknodargs *args = rqstp->rq_argp;
 710
 711         if (!svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len))
 712                 return 0;
 713         if (xdr_stream_decode_u32(xdr, &args->ftype) < 0)
 714                 return 0;
 715         switch (args->ftype) {
 716         case NF3CHR:
 717         case NF3BLK:
 718                 return svcxdr_decode_devicedata3(rqstp, xdr, args);
 719         case NF3SOCK:
 720         case NF3FIFO:
 721                 return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs);
 722         case NF3REG:
 723         case NF3DIR:
 724         case NF3LNK:
 725                 /* Valid XDR but illegal file types */
 726                 break;
 727         default:
 728                 return 0;
 729         }
 730
 731         return 1;
 732 }
 733
 734 int
 735 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
 736 {
 737         struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 738         struct nfsd3_renameargs *args = rqstp->rq_argp;
 739
 740         return svcxdr_decode_diropargs3(xdr, &args->ffh,
 741                                         &args->fname, &args->flen) &&
 742                 svcxdr_decode_diropargs3(xdr, &args->tfh,
 743                                          &args->tname, &args->tlen);
 744 }
 745
 746 int
 747 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
 748 {
 749         struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 750         struct nfsd3_linkargs *args = rqstp->rq_argp;
 751
 752         return svcxdr_decode_nfs_fh3(xdr, &args->ffh) &&
 753                 svcxdr_decode_diropargs3(xdr, &args->tfh,
 754                                          &args->tname, &args->tlen);
 755 }
 756
 757 int
 758 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
 759 {
 760         struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 761         struct nfsd3_readdirargs *args = rqstp->rq_argp;
 762
 763         if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
 764                 return 0;
 765         if (xdr_stream_decode_u64(xdr, &args->cookie) < 0)
 766                 return 0;
 767         args->verf = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
 768         if (!args->verf)
 769                 return 0;
 770         if (xdr_stream_decode_u32(xdr, &args->count) < 0)
 771                 return 0;
 772
 773         return 1;
 774 }
 775
 776 int
 777 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
 778 {
 779         struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 780         struct nfsd3_readdirargs *args = rqstp->rq_argp;
 781         u32 dircount;
 782
 783         if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
 784                 return 0;
 785         if (xdr_stream_decode_u64(xdr, &args->cookie) < 0)
 786                 return 0;
 787         args->verf = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
 788         if (!args->verf)
 789                 return 0;
 790         /* dircount is ignored */
 791         if (xdr_stream_decode_u32(xdr, &dircount) < 0)
 792                 return 0;
 793         if (xdr_stream_decode_u32(xdr, &args->count) < 0)
 794                 return 0;
 795
 796         return 1;
 797 }
 798
 799 int
 800 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
 801 {
 802         struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 803         struct nfsd3_commitargs *args = rqstp->rq_argp;
 804
 805         if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
 806                 return 0;
 807         if (xdr_stream_decode_u64(xdr, &args->offset) < 0)
 808                 return 0;
 809         if (xdr_stream_decode_u32(xdr, &args->count) < 0)
 810                 return 0;
 811
 812         return 1;
 813 }
 814
 815 /*
 816  * XDR encode functions
 817  */
 818
 819 /* GETATTR */
 820 int
 821 nfs3svc_encode_getattrres(struct svc_rqst *rqstp, __be32 *p)
 822 {
 823         struct xdr_stream *xdr = &rqstp->rq_res_stream;
 824         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 825
 826         if (!svcxdr_encode_nfsstat3(xdr, resp->status))
 827                 return 0;
 828         switch (resp->status) {
 829         case nfs_ok:
 830                 lease_get_mtime(d_inode(resp->fh.fh_dentry), &resp->stat.mtime);
 831                 if (!svcxdr_encode_fattr3(rqstp, xdr, &resp->fh, &resp->stat))
 832                         return 0;
 833                 break;
 834         }
 835
 836         return 1;
 837 }
 838
 839 /* SETATTR, REMOVE, RMDIR */
 840 int
 841 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p)
 842 {
 843         struct xdr_stream *xdr = &rqstp->rq_res_stream;
 844         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 845
 846         return svcxdr_encode_nfsstat3(xdr, resp->status) &&
 847                 svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh);
 848 }
 849
 850 /* LOOKUP */
 851 int nfs3svc_encode_lookupres(struct svc_rqst *rqstp, __be32 *p)
 852 {
 853         struct xdr_stream *xdr = &rqstp->rq_res_stream;
 854         struct nfsd3_diropres *resp = rqstp->rq_resp;
 855
 856         if (!svcxdr_encode_nfsstat3(xdr, resp->status))
 857                 return 0;
 858         switch (resp->status) {
 859         case nfs_ok:
 860                 if (!svcxdr_encode_nfs_fh3(xdr, &resp->fh))
 861                         return 0;
 862                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
 863                         return 0;
 864                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->dirfh))
 865                         return 0;
 866                 break;
 867         default:
 868                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->dirfh))
 869                         return 0;
 870         }
 871
 872         return 1;
 873 }
 874
 875 /* ACCESS */
 876 int
 877 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
 878 {
 879         struct xdr_stream *xdr = &rqstp->rq_res_stream;
 880         struct nfsd3_accessres *resp = rqstp->rq_resp;
 881
 882         if (!svcxdr_encode_nfsstat3(xdr, resp->status))
 883                 return 0;
 884         switch (resp->status) {
 885         case nfs_ok:
 886                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
 887                         return 0;
 888                 if (xdr_stream_encode_u32(xdr, resp->access) < 0)
 889                         return 0;
 890                 break;
 891         default:
 892                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
 893                         return 0;
 894         }
 895
 896         return 1;
 897 }
 898
 899 /* READLINK */
 900 int
 901 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
 902 {
 903         struct xdr_stream *xdr = &rqstp->rq_res_stream;
 904         struct nfsd3_readlinkres *resp = rqstp->rq_resp;
 905         struct kvec *head = rqstp->rq_res.head;
 906
 907         if (!svcxdr_encode_nfsstat3(xdr, resp->status))
 908                 return 0;
 909         switch (resp->status) {
 910         case nfs_ok:
 911                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
 912                         return 0;
 913                 if (xdr_stream_encode_u32(xdr, resp->len) < 0)
 914                         return 0;
 915                 xdr_write_pages(xdr, resp->pages, 0, resp->len);
 916                 if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0)
 917                         return 0;
 918                 break;
 919         default:
 920                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
 921                         return 0;
 922         }
 923
 924         return 1;
 925 }
 926
 927 /* READ */
 928 int
 929 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
 930 {
 931         struct xdr_stream *xdr = &rqstp->rq_res_stream;
 932         struct nfsd3_readres *resp = rqstp->rq_resp;
 933         struct kvec *head = rqstp->rq_res.head;
 934
 935         if (!svcxdr_encode_nfsstat3(xdr, resp->status))
 936                 return 0;
 937         switch (resp->status) {
 938         case nfs_ok:
 939                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
 940                         return 0;
 941                 if (xdr_stream_encode_u32(xdr, resp->count) < 0)
 942                         return 0;
 943                 if (xdr_stream_encode_bool(xdr, resp->eof) < 0)
 944                         return 0;
 945                 if (xdr_stream_encode_u32(xdr, resp->count) < 0)
 946                         return 0;
 947                 xdr_write_pages(xdr, resp->pages, rqstp->rq_res.page_base,
 948                                 resp->count);
 949                 if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0)
 950                         return 0;
 951                 break;
 952         default:
 953                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
 954                         return 0;
 955         }
 956
 957         return 1;
 958 }
 959
 960 /* WRITE */
 961 int
 962 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
 963 {
 964         struct xdr_stream *xdr = &rqstp->rq_res_stream;
 965         struct nfsd3_writeres *resp = rqstp->rq_resp;
 966
 967         if (!svcxdr_encode_nfsstat3(xdr, resp->status))
 968                 return 0;
 969         switch (resp->status) {
 970         case nfs_ok:
 971                 if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
 972                         return 0;
 973                 if (xdr_stream_encode_u32(xdr, resp->count) < 0)
 974                         return 0;
 975                 if (xdr_stream_encode_u32(xdr, resp->committed) < 0)
 976                         return 0;
 977                 if (!svcxdr_encode_writeverf3(xdr, resp->verf))
 978                         return 0;
 979                 break;
 980         default:
 981                 if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
 982                         return 0;
 983         }
 984
 985         return 1;
 986 }
 987
 988 /* CREATE, MKDIR, SYMLINK, MKNOD */
 989 int
 990 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p)
 991 {
 992         struct xdr_stream *xdr = &rqstp->rq_res_stream;
 993         struct nfsd3_diropres *resp = rqstp->rq_resp;
 994
 995         if (!svcxdr_encode_nfsstat3(xdr, resp->status))
 996                 return 0;
 997         switch (resp->status) {
 998         case nfs_ok:
 999                 if (!svcxdr_encode_post_op_fh3(xdr, &resp->fh))
1000                         return 0;
1001                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
1002                         return 0;
1003                 if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->dirfh))
1004                         return 0;
1005                 break;
1006         default:
1007                 if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->dirfh))
1008                         return 0;
1009         }
1010
1011         return 1;
1012 }
1013
1014 /* RENAME */
1015 int
1016 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p)
1017 {
1018         struct xdr_stream *xdr = &rqstp->rq_res_stream;
1019         struct nfsd3_renameres *resp = rqstp->rq_resp;
1020
1021         return svcxdr_encode_nfsstat3(xdr, resp->status) &&
1022                 svcxdr_encode_wcc_data(rqstp, xdr, &resp->ffh) &&
1023                 svcxdr_encode_wcc_data(rqstp, xdr, &resp->tfh);
1024 }
1025
1026 /* LINK */
1027 int
1028 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p)
1029 {
1030         struct xdr_stream *xdr = &rqstp->rq_res_stream;
1031         struct nfsd3_linkres *resp = rqstp->rq_resp;
1032
1033         return svcxdr_encode_nfsstat3(xdr, resp->status) &&
1034                 svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh) &&
1035                 svcxdr_encode_wcc_data(rqstp, xdr, &resp->tfh);
1036 }
1037
1038 /* READDIR */
1039 int
1040 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
1041 {
1042         struct xdr_stream *xdr = &rqstp->rq_res_stream;
1043         struct nfsd3_readdirres *resp = rqstp->rq_resp;
1044         struct xdr_buf *dirlist = &resp->dirlist;
1045
1046         if (!svcxdr_encode_nfsstat3(xdr, resp->status))
1047                 return 0;
1048         switch (resp->status) {
1049         case nfs_ok:
1050                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
1051                         return 0;
1052                 if (!svcxdr_encode_cookieverf3(xdr, resp->verf))
1053                         return 0;
1054                 xdr_write_pages(xdr, dirlist->pages, 0, dirlist->len);
1055                 /* no more entries */
1056                 if (xdr_stream_encode_item_absent(xdr) < 0)
1057                         return 0;
1058                 if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
1059                         return 0;
1060                 break;
1061         default:
1062                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
1063                         return 0;
1064         }
1065
1066         return 1;
1067 }
1068
1069 static __be32
1070 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
1071                  const char *name, int namlen, u64 ino)
1072 {
1073         struct svc_export       *exp;
1074         struct dentry           *dparent, *dchild;
1075         __be32 rv = nfserr_noent;
1076
1077         dparent = cd->fh.fh_dentry;
1078         exp  = cd->fh.fh_export;
1079
1080         if (isdotent(name, namlen)) {
1081                 if (namlen == 2) {
1082                         dchild = dget_parent(dparent);
1083                         /*
1084                          * Don't return filehandle for ".." if we're at
1085                          * the filesystem or export root:
1086                          */
1087                         if (dchild == dparent)
1088                                 goto out;
1089                         if (dparent == exp->ex_path.dentry)
1090                                 goto out;
1091                 } else
1092                         dchild = dget(dparent);
1093         } else
1094                 dchild = lookup_positive_unlocked(name, dparent, namlen);
1095         if (IS_ERR(dchild))
1096                 return rv;
1097         if (d_mountpoint(dchild))
1098                 goto out;
1099         if (dchild->d_inode->i_ino != ino)
1100                 goto out;
1101         rv = fh_compose(fhp, exp, dchild, &cd->fh);
1102 out:
1103         dput(dchild);
1104         return rv;
1105 }
1106
1107 /**
1108  * nfs3svc_encode_cookie3 - Encode a directory offset cookie
1109  * @resp: readdir result context
1110  * @offset: offset cookie to encode
1111  *
1112  * The buffer space for the offset cookie has already been reserved
1113  * by svcxdr_encode_entry3_common().
1114  */
1115 void nfs3svc_encode_cookie3(struct nfsd3_readdirres *resp, u64 offset)
1116 {
1117         __be64 cookie = cpu_to_be64(offset);
1118
1119         if (!resp->cookie_offset)
1120                 return;
1121         write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie,
1122                                sizeof(cookie));
1123         resp->cookie_offset = 0;
1124 }
1125
1126 static bool
1127 svcxdr_encode_entry3_common(struct nfsd3_readdirres *resp, const char *name,
1128                             int namlen, loff_t offset, u64 ino)
1129 {
1130         struct xdr_buf *dirlist = &resp->dirlist;
1131         struct xdr_stream *xdr = &resp->xdr;
1132
1133         if (xdr_stream_encode_item_present(xdr) < 0)
1134                 return false;
1135         /* fileid */
1136         if (xdr_stream_encode_u64(xdr, ino) < 0)
1137                 return false;
1138         /* name */
1139         if (xdr_stream_encode_opaque(xdr, name, min(namlen, NFS3_MAXNAMLEN)) < 0)
1140                 return false;
1141         /* cookie */
1142         resp->cookie_offset = dirlist->len;
1143         if (xdr_stream_encode_u64(xdr, NFS_OFFSET_MAX) < 0)
1144                 return false;
1145
1146         return true;
1147 }
1148
1149 /**
1150  * nfs3svc_encode_entry3 - encode one NFSv3 READDIR entry
1151  * @data: directory context
1152  * @name: name of the object to be encoded
1153  * @namlen: length of that name, in bytes
1154  * @offset: the offset of the previous entry
1155  * @ino: the fileid of this entry
1156  * @d_type: unused
1157  *
1158  * Return values:
1159  *   %0: Entry was successfully encoded.
1160  *   %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
1161  *
1162  * On exit, the following fields are updated:
1163  *   - resp->xdr
1164  *   - resp->common.err
1165  *   - resp->cookie_offset
1166  */
1167 int nfs3svc_encode_entry3(void *data, const char *name, int namlen,
1168                           loff_t offset, u64 ino, unsigned int d_type)
1169 {
1170         struct readdir_cd *ccd = data;
1171         struct nfsd3_readdirres *resp = container_of(ccd,
1172                                                      struct nfsd3_readdirres,
1173                                                      common);
1174         unsigned int starting_length = resp->dirlist.len;
1175
1176         /* The offset cookie for the previous entry */
1177         nfs3svc_encode_cookie3(resp, offset);
1178
1179         if (!svcxdr_encode_entry3_common(resp, name, namlen, offset, ino))
1180                 goto out_toosmall;
1181
1182         xdr_commit_encode(&resp->xdr);
1183         resp->common.err = nfs_ok;
1184         return 0;
1185
1186 out_toosmall:
1187         resp->cookie_offset = 0;
1188         resp->common.err = nfserr_toosmall;
1189         resp->dirlist.len = starting_length;
1190         return -EINVAL;
1191 }
1192
1193 static bool
1194 svcxdr_encode_entry3_plus(struct nfsd3_readdirres *resp, const char *name,
1195                           int namlen, u64 ino)
1196 {
1197         struct xdr_stream *xdr = &resp->xdr;
1198         struct svc_fh *fhp = &resp->scratch;
1199         bool result;
1200
1201         result = false;
1202         fh_init(fhp, NFS3_FHSIZE);
1203         if (compose_entry_fh(resp, fhp, name, namlen, ino) != nfs_ok)
1204                 goto out_noattrs;
1205
1206         if (!svcxdr_encode_post_op_attr(resp->rqstp, xdr, fhp))
1207                 goto out;
1208         if (!svcxdr_encode_post_op_fh3(xdr, fhp))
1209                 goto out;
1210         result = true;
1211
1212 out:
1213         fh_put(fhp);
1214         return result;
1215
1216 out_noattrs:
1217         if (xdr_stream_encode_item_absent(xdr) < 0)
1218                 return false;
1219         if (xdr_stream_encode_item_absent(xdr) < 0)
1220                 return false;
1221         return true;
1222 }
1223
1224 /**
1225  * nfs3svc_encode_entryplus3 - encode one NFSv3 READDIRPLUS entry
1226  * @data: directory context
1227  * @name: name of the object to be encoded
1228  * @namlen: length of that name, in bytes
1229  * @offset: the offset of the previous entry
1230  * @ino: the fileid of this entry
1231  * @d_type: unused
1232  *
1233  * Return values:
1234  *   %0: Entry was successfully encoded.
1235  *   %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
1236  *
1237  * On exit, the following fields are updated:
1238  *   - resp->xdr
1239  *   - resp->common.err
1240  *   - resp->cookie_offset
1241  */
1242 int nfs3svc_encode_entryplus3(void *data, const char *name, int namlen,
1243                               loff_t offset, u64 ino, unsigned int d_type)
1244 {
1245         struct readdir_cd *ccd = data;
1246         struct nfsd3_readdirres *resp = container_of(ccd,
1247                                                      struct nfsd3_readdirres,
1248                                                      common);
1249         unsigned int starting_length = resp->dirlist.len;
1250
1251         /* The offset cookie for the previous entry */
1252         nfs3svc_encode_cookie3(resp, offset);
1253
1254         if (!svcxdr_encode_entry3_common(resp, name, namlen, offset, ino))
1255                 goto out_toosmall;
1256         if (!svcxdr_encode_entry3_plus(resp, name, namlen, ino))
1257                 goto out_toosmall;
1258
1259         xdr_commit_encode(&resp->xdr);
1260         resp->common.err = nfs_ok;
1261         return 0;
1262
1263 out_toosmall:
1264         resp->cookie_offset = 0;
1265         resp->common.err = nfserr_toosmall;
1266         resp->dirlist.len = starting_length;
1267         return -EINVAL;
1268 }
1269
1270 static bool
1271 svcxdr_encode_fsstat3resok(struct xdr_stream *xdr,
1272                            const struct nfsd3_fsstatres *resp)
1273 {
1274         const struct kstatfs *s = &resp->stats;
1275         u64 bs = s->f_bsize;
1276         __be32 *p;
1277
1278         p = xdr_reserve_space(xdr, XDR_UNIT * 13);
1279         if (!p)
1280                 return false;
1281         p = xdr_encode_hyper(p, bs * s->f_blocks);      /* total bytes */
1282         p = xdr_encode_hyper(p, bs * s->f_bfree);       /* free bytes */
1283         p = xdr_encode_hyper(p, bs * s->f_bavail);      /* user available bytes */
1284         p = xdr_encode_hyper(p, s->f_files);            /* total inodes */
1285         p = xdr_encode_hyper(p, s->f_ffree);            /* free inodes */
1286         p = xdr_encode_hyper(p, s->f_ffree);            /* user available inodes */
1287         *p = cpu_to_be32(resp->invarsec);               /* mean unchanged time */
1288
1289         return true;
1290 }
1291
1292 /* FSSTAT */
1293 int
1294 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p)
1295 {
1296         struct xdr_stream *xdr = &rqstp->rq_res_stream;
1297         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
1298
1299         if (!svcxdr_encode_nfsstat3(xdr, resp->status))
1300                 return 0;
1301         switch (resp->status) {
1302         case nfs_ok:
1303                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
1304                         return 0;
1305                 if (!svcxdr_encode_fsstat3resok(xdr, resp))
1306                         return 0;
1307                 break;
1308         default:
1309                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
1310                         return 0;
1311         }
1312
1313         return 1;
1314 }
1315
1316 static bool
1317 svcxdr_encode_fsinfo3resok(struct xdr_stream *xdr,
1318                            const struct nfsd3_fsinfores *resp)
1319 {
1320         __be32 *p;
1321
1322         p = xdr_reserve_space(xdr, XDR_UNIT * 12);
1323         if (!p)
1324                 return false;
1325         *p++ = cpu_to_be32(resp->f_rtmax);
1326         *p++ = cpu_to_be32(resp->f_rtpref);
1327         *p++ = cpu_to_be32(resp->f_rtmult);
1328         *p++ = cpu_to_be32(resp->f_wtmax);
1329         *p++ = cpu_to_be32(resp->f_wtpref);
1330         *p++ = cpu_to_be32(resp->f_wtmult);
1331         *p++ = cpu_to_be32(resp->f_dtpref);
1332         p = xdr_encode_hyper(p, resp->f_maxfilesize);
1333         p = encode_nfstime3(p, &nfs3svc_time_delta);
1334         *p = cpu_to_be32(resp->f_properties);
1335
1336         return true;
1337 }
1338
1339 /* FSINFO */
1340 int
1341 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p)
1342 {
1343         struct xdr_stream *xdr = &rqstp->rq_res_stream;
1344         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
1345
1346         if (!svcxdr_encode_nfsstat3(xdr, resp->status))
1347                 return 0;
1348         switch (resp->status) {
1349         case nfs_ok:
1350                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
1351                         return 0;
1352                 if (!svcxdr_encode_fsinfo3resok(xdr, resp))
1353                         return 0;
1354                 break;
1355         default:
1356                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
1357                         return 0;
1358         }
1359
1360         return 1;
1361 }
1362
1363 static bool
1364 svcxdr_encode_pathconf3resok(struct xdr_stream *xdr,
1365                              const struct nfsd3_pathconfres *resp)
1366 {
1367         __be32 *p;
1368
1369         p = xdr_reserve_space(xdr, XDR_UNIT * 6);
1370         if (!p)
1371                 return false;
1372         *p++ = cpu_to_be32(resp->p_link_max);
1373         *p++ = cpu_to_be32(resp->p_name_max);
1374         p = xdr_encode_bool(p, resp->p_no_trunc);
1375         p = xdr_encode_bool(p, resp->p_chown_restricted);
1376         p = xdr_encode_bool(p, resp->p_case_insensitive);
1377         xdr_encode_bool(p, resp->p_case_preserving);
1378
1379         return true;
1380 }
1381
1382 /* PATHCONF */
1383 int
1384 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p)
1385 {
1386         struct xdr_stream *xdr = &rqstp->rq_res_stream;
1387         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
1388
1389         if (!svcxdr_encode_nfsstat3(xdr, resp->status))
1390                 return 0;
1391         switch (resp->status) {
1392         case nfs_ok:
1393                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
1394                         return 0;
1395                 if (!svcxdr_encode_pathconf3resok(xdr, resp))
1396                         return 0;
1397                 break;
1398         default:
1399                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
1400                         return 0;
1401         }
1402
1403         return 1;
1404 }
1405
1406 /* COMMIT */
1407 int
1408 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
1409 {
1410         struct xdr_stream *xdr = &rqstp->rq_res_stream;
1411         struct nfsd3_commitres *resp = rqstp->rq_resp;
1412
1413         if (!svcxdr_encode_nfsstat3(xdr, resp->status))
1414                 return 0;
1415         switch (resp->status) {
1416         case nfs_ok:
1417                 if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
1418                         return 0;
1419                 if (!svcxdr_encode_writeverf3(xdr, resp->verf))
1420                         return 0;
1421                 break;
1422         default:
1423                 if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
1424                         return 0;
1425         }
1426
1427         return 1;
1428 }
1429
1430 /*
1431  * XDR release functions
1432  */
1433 void
1434 nfs3svc_release_fhandle(struct svc_rqst *rqstp)
1435 {
1436         struct nfsd3_attrstat *resp = rqstp->rq_resp;
1437
1438         fh_put(&resp->fh);
1439 }
1440
1441 void
1442 nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
1443 {
1444         struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;
1445
1446         fh_put(&resp->fh1);
1447         fh_put(&resp->fh2);
1448 }