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 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  18
  19
  20 /*
  21  * Mapping of S_IF* types to NFS file types
  22  */
  23 static u32      nfs3_ftypes[] = {
  24         NF3NON,  NF3FIFO, NF3CHR, NF3BAD,
  25         NF3DIR,  NF3BAD,  NF3BLK, NF3BAD,
  26         NF3REG,  NF3BAD,  NF3LNK, NF3BAD,
  27         NF3SOCK, NF3BAD,  NF3LNK, NF3BAD,
  28 };
  29
  30
  31 /*
  32  * XDR functions for basic NFS types
  33  */
  34 static __be32 *
  35 encode_time3(__be32 *p, struct timespec64 *time)
  36 {
  37         *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
  38         return p;
  39 }
  40
  41 static __be32 *
  42 decode_time3(__be32 *p, struct timespec64 *time)
  43 {
  44         time->tv_sec = ntohl(*p++);
  45         time->tv_nsec = ntohl(*p++);
  46         return p;
  47 }
  48
  49 static __be32 *
  50 decode_fh(__be32 *p, struct svc_fh *fhp)
  51 {
  52         unsigned int size;
  53         fh_init(fhp, NFS3_FHSIZE);
  54         size = ntohl(*p++);
  55         if (size > NFS3_FHSIZE)
  56                 return NULL;
  57
  58         memcpy(&fhp->fh_handle.fh_base, p, size);
  59         fhp->fh_handle.fh_size = size;
  60         return p + XDR_QUADLEN(size);
  61 }
  62
  63 /* Helper function for NFSv3 ACL code */
  64 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
  65 {
  66         return decode_fh(p, fhp);
  67 }
  68
  69 static __be32 *
  70 encode_fh(__be32 *p, struct svc_fh *fhp)
  71 {
  72         unsigned int size = fhp->fh_handle.fh_size;
  73         *p++ = htonl(size);
  74         if (size) p[XDR_QUADLEN(size)-1]=0;
  75         memcpy(p, &fhp->fh_handle.fh_base, size);
  76         return p + XDR_QUADLEN(size);
  77 }
  78
  79 /*
  80  * Decode a file name and make sure that the path contains
  81  * no slashes or null bytes.
  82  */
  83 static __be32 *
  84 decode_filename(__be32 *p, char **namp, unsigned int *lenp)
  85 {
  86         char            *name;
  87         unsigned int    i;
  88
  89         if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
  90                 for (i = 0, name = *namp; i < *lenp; i++, name++) {
  91                         if (*name == '\0' || *name == '/')
  92                                 return NULL;
  93                 }
  94         }
  95
  96         return p;
  97 }
  98
  99 static __be32 *
 100 decode_sattr3(__be32 *p, struct iattr *iap, struct user_namespace *userns)
 101 {
 102         u32     tmp;
 103
 104         iap->ia_valid = 0;
 105
 106         if (*p++) {
 107                 iap->ia_valid |= ATTR_MODE;
 108                 iap->ia_mode = ntohl(*p++);
 109         }
 110         if (*p++) {
 111                 iap->ia_uid = make_kuid(userns, ntohl(*p++));
 112                 if (uid_valid(iap->ia_uid))
 113                         iap->ia_valid |= ATTR_UID;
 114         }
 115         if (*p++) {
 116                 iap->ia_gid = make_kgid(userns, ntohl(*p++));
 117                 if (gid_valid(iap->ia_gid))
 118                         iap->ia_valid |= ATTR_GID;
 119         }
 120         if (*p++) {
 121                 u64     newsize;
 122
 123                 iap->ia_valid |= ATTR_SIZE;
 124                 p = xdr_decode_hyper(p, &newsize);
 125                 iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
 126         }
 127         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 128                 iap->ia_valid |= ATTR_ATIME;
 129         } else if (tmp == 2) {          /* set to client time */
 130                 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
 131                 iap->ia_atime.tv_sec = ntohl(*p++);
 132                 iap->ia_atime.tv_nsec = ntohl(*p++);
 133         }
 134         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 135                 iap->ia_valid |= ATTR_MTIME;
 136         } else if (tmp == 2) {          /* set to client time */
 137                 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
 138                 iap->ia_mtime.tv_sec = ntohl(*p++);
 139                 iap->ia_mtime.tv_nsec = ntohl(*p++);
 140         }
 141         return p;
 142 }
 143
 144 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
 145 {
 146         u64 f;
 147         switch(fsid_source(fhp)) {
 148         default:
 149         case FSIDSOURCE_DEV:
 150                 p = xdr_encode_hyper(p, (u64)huge_encode_dev
 151                                      (fhp->fh_dentry->d_sb->s_dev));
 152                 break;
 153         case FSIDSOURCE_FSID:
 154                 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
 155                 break;
 156         case FSIDSOURCE_UUID:
 157                 f = ((u64*)fhp->fh_export->ex_uuid)[0];
 158                 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
 159                 p = xdr_encode_hyper(p, f);
 160                 break;
 161         }
 162         return p;
 163 }
 164
 165 static __be32 *
 166 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
 167               struct kstat *stat)
 168 {
 169         struct user_namespace *userns = nfsd_user_namespace(rqstp);
 170         *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
 171         *p++ = htonl((u32) (stat->mode & S_IALLUGO));
 172         *p++ = htonl((u32) stat->nlink);
 173         *p++ = htonl((u32) from_kuid_munged(userns, stat->uid));
 174         *p++ = htonl((u32) from_kgid_munged(userns, stat->gid));
 175         if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
 176                 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
 177         } else {
 178                 p = xdr_encode_hyper(p, (u64) stat->size);
 179         }
 180         p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
 181         *p++ = htonl((u32) MAJOR(stat->rdev));
 182         *p++ = htonl((u32) MINOR(stat->rdev));
 183         p = encode_fsid(p, fhp);
 184         p = xdr_encode_hyper(p, stat->ino);
 185         p = encode_time3(p, &stat->atime);
 186         p = encode_time3(p, &stat->mtime);
 187         p = encode_time3(p, &stat->ctime);
 188
 189         return p;
 190 }
 191
 192 static __be32 *
 193 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 194 {
 195         /* Attributes to follow */
 196         *p++ = xdr_one;
 197         return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
 198 }
 199
 200 /*
 201  * Encode post-operation attributes.
 202  * The inode may be NULL if the call failed because of a stale file
 203  * handle. In this case, no attributes are returned.
 204  */
 205 static __be32 *
 206 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 207 {
 208         struct dentry *dentry = fhp->fh_dentry;
 209         if (dentry && d_really_is_positive(dentry)) {
 210                 __be32 err;
 211                 struct kstat stat;
 212
 213                 err = fh_getattr(fhp, &stat);
 214                 if (!err) {
 215                         *p++ = xdr_one;         /* attributes follow */
 216                         lease_get_mtime(d_inode(dentry), &stat.mtime);
 217                         return encode_fattr3(rqstp, p, fhp, &stat);
 218                 }
 219         }
 220         *p++ = xdr_zero;
 221         return p;
 222 }
 223
 224 /* Helper for NFSv3 ACLs */
 225 __be32 *
 226 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 227 {
 228         return encode_post_op_attr(rqstp, p, fhp);
 229 }
 230
 231 /*
 232  * Enocde weak cache consistency data
 233  */
 234 static __be32 *
 235 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 236 {
 237         struct dentry   *dentry = fhp->fh_dentry;
 238
 239         if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
 240                 if (fhp->fh_pre_saved) {
 241                         *p++ = xdr_one;
 242                         p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
 243                         p = encode_time3(p, &fhp->fh_pre_mtime);
 244                         p = encode_time3(p, &fhp->fh_pre_ctime);
 245                 } else {
 246                         *p++ = xdr_zero;
 247                 }
 248                 return encode_saved_post_attr(rqstp, p, fhp);
 249         }
 250         /* no pre- or post-attrs */
 251         *p++ = xdr_zero;
 252         return encode_post_op_attr(rqstp, p, fhp);
 253 }
 254
 255 /*
 256  * Fill in the pre_op attr for the wcc data
 257  */
 258 void fill_pre_wcc(struct svc_fh *fhp)
 259 {
 260         struct inode    *inode;
 261         struct kstat    stat;
 262         __be32 err;
 263
 264         if (fhp->fh_pre_saved)
 265                 return;
 266
 267         inode = d_inode(fhp->fh_dentry);
 268         err = fh_getattr(fhp, &stat);
 269         if (err) {
 270                 /* Grab the times from inode anyway */
 271                 stat.mtime = inode->i_mtime;
 272                 stat.ctime = inode->i_ctime;
 273                 stat.size  = inode->i_size;
 274         }
 275
 276         fhp->fh_pre_mtime = stat.mtime;
 277         fhp->fh_pre_ctime = stat.ctime;
 278         fhp->fh_pre_size  = stat.size;
 279         fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode);
 280         fhp->fh_pre_saved = true;
 281 }
 282
 283 /*
 284  * Fill in the post_op attr for the wcc data
 285  */
 286 void fill_post_wcc(struct svc_fh *fhp)
 287 {
 288         __be32 err;
 289
 290         if (fhp->fh_post_saved)
 291                 printk("nfsd: inode locked twice during operation.\n");
 292
 293         err = fh_getattr(fhp, &fhp->fh_post_attr);
 294         fhp->fh_post_change = nfsd4_change_attribute(&fhp->fh_post_attr,
 295                                                      d_inode(fhp->fh_dentry));
 296         if (err) {
 297                 fhp->fh_post_saved = false;
 298                 /* Grab the ctime anyway - set_change_info might use it */
 299                 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
 300         } else
 301                 fhp->fh_post_saved = true;
 302 }
 303
 304 /*
 305  * XDR decode functions
 306  */
 307 int
 308 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
 309 {
 310         struct nfsd_fhandle *args = rqstp->rq_argp;
 311
 312         p = decode_fh(p, &args->fh);
 313         if (!p)
 314                 return 0;
 315         return xdr_argsize_check(rqstp, p);
 316 }
 317
 318 int
 319 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
 320 {
 321         struct nfsd3_sattrargs *args = rqstp->rq_argp;
 322
 323         p = decode_fh(p, &args->fh);
 324         if (!p)
 325                 return 0;
 326         p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
 327
 328         if ((args->check_guard = ntohl(*p++)) != 0) {
 329                 struct timespec64 time;
 330                 p = decode_time3(p, &time);
 331                 args->guardtime = time.tv_sec;
 332         }
 333
 334         return xdr_argsize_check(rqstp, p);
 335 }
 336
 337 int
 338 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
 339 {
 340         struct nfsd3_diropargs *args = rqstp->rq_argp;
 341
 342         if (!(p = decode_fh(p, &args->fh))
 343          || !(p = decode_filename(p, &args->name, &args->len)))
 344                 return 0;
 345
 346         return xdr_argsize_check(rqstp, p);
 347 }
 348
 349 int
 350 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
 351 {
 352         struct nfsd3_accessargs *args = rqstp->rq_argp;
 353
 354         p = decode_fh(p, &args->fh);
 355         if (!p)
 356                 return 0;
 357         args->access = ntohl(*p++);
 358
 359         return xdr_argsize_check(rqstp, p);
 360 }
 361
 362 int
 363 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
 364 {
 365         struct nfsd3_readargs *args = rqstp->rq_argp;
 366         unsigned int len;
 367         int v;
 368         u32 max_blocksize = svc_max_payload(rqstp);
 369
 370         p = decode_fh(p, &args->fh);
 371         if (!p)
 372                 return 0;
 373         p = xdr_decode_hyper(p, &args->offset);
 374
 375         args->count = ntohl(*p++);
 376         len = min(args->count, max_blocksize);
 377
 378         /* set up the kvec */
 379         v=0;
 380         while (len > 0) {
 381                 struct page *p = *(rqstp->rq_next_page++);
 382
 383                 rqstp->rq_vec[v].iov_base = page_address(p);
 384                 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
 385                 len -= rqstp->rq_vec[v].iov_len;
 386                 v++;
 387         }
 388         args->vlen = v;
 389         return xdr_argsize_check(rqstp, p);
 390 }
 391
 392 int
 393 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
 394 {
 395         struct nfsd3_writeargs *args = rqstp->rq_argp;
 396         unsigned int len, hdr, dlen;
 397         u32 max_blocksize = svc_max_payload(rqstp);
 398         struct kvec *head = rqstp->rq_arg.head;
 399         struct kvec *tail = rqstp->rq_arg.tail;
 400
 401         p = decode_fh(p, &args->fh);
 402         if (!p)
 403                 return 0;
 404         p = xdr_decode_hyper(p, &args->offset);
 405
 406         args->count = ntohl(*p++);
 407         args->stable = ntohl(*p++);
 408         len = args->len = ntohl(*p++);
 409         if ((void *)p > head->iov_base + head->iov_len)
 410                 return 0;
 411         /*
 412          * The count must equal the amount of data passed.
 413          */
 414         if (args->count != args->len)
 415                 return 0;
 416
 417         /*
 418          * Check to make sure that we got the right number of
 419          * bytes.
 420          */
 421         hdr = (void*)p - head->iov_base;
 422         dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr;
 423         /*
 424          * Round the length of the data which was specified up to
 425          * the next multiple of XDR units and then compare that
 426          * against the length which was actually received.
 427          * Note that when RPCSEC/GSS (for example) is used, the
 428          * data buffer can be padded so dlen might be larger
 429          * than required.  It must never be smaller.
 430          */
 431         if (dlen < XDR_QUADLEN(len)*4)
 432                 return 0;
 433
 434         if (args->count > max_blocksize) {
 435                 args->count = max_blocksize;
 436                 len = args->len = max_blocksize;
 437         }
 438
 439         args->first.iov_base = (void *)p;
 440         args->first.iov_len = head->iov_len - hdr;
 441         return 1;
 442 }
 443
 444 int
 445 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
 446 {
 447         struct nfsd3_createargs *args = rqstp->rq_argp;
 448
 449         if (!(p = decode_fh(p, &args->fh))
 450          || !(p = decode_filename(p, &args->name, &args->len)))
 451                 return 0;
 452
 453         switch (args->createmode = ntohl(*p++)) {
 454         case NFS3_CREATE_UNCHECKED:
 455         case NFS3_CREATE_GUARDED:
 456                 p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
 457                 break;
 458         case NFS3_CREATE_EXCLUSIVE:
 459                 args->verf = p;
 460                 p += 2;
 461                 break;
 462         default:
 463                 return 0;
 464         }
 465
 466         return xdr_argsize_check(rqstp, p);
 467 }
 468
 469 int
 470 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
 471 {
 472         struct nfsd3_createargs *args = rqstp->rq_argp;
 473
 474         if (!(p = decode_fh(p, &args->fh)) ||
 475             !(p = decode_filename(p, &args->name, &args->len)))
 476                 return 0;
 477         p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
 478
 479         return xdr_argsize_check(rqstp, p);
 480 }
 481
 482 int
 483 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
 484 {
 485         struct nfsd3_symlinkargs *args = rqstp->rq_argp;
 486         char *base = (char *)p;
 487         size_t dlen;
 488
 489         if (!(p = decode_fh(p, &args->ffh)) ||
 490             !(p = decode_filename(p, &args->fname, &args->flen)))
 491                 return 0;
 492         p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
 493
 494         args->tlen = ntohl(*p++);
 495
 496         args->first.iov_base = p;
 497         args->first.iov_len = rqstp->rq_arg.head[0].iov_len;
 498         args->first.iov_len -= (char *)p - base;
 499
 500         dlen = args->first.iov_len + rqstp->rq_arg.page_len +
 501                rqstp->rq_arg.tail[0].iov_len;
 502         if (dlen < XDR_QUADLEN(args->tlen) << 2)
 503                 return 0;
 504         return 1;
 505 }
 506
 507 int
 508 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
 509 {
 510         struct nfsd3_mknodargs *args = rqstp->rq_argp;
 511
 512         if (!(p = decode_fh(p, &args->fh))
 513          || !(p = decode_filename(p, &args->name, &args->len)))
 514                 return 0;
 515
 516         args->ftype = ntohl(*p++);
 517
 518         if (args->ftype == NF3BLK  || args->ftype == NF3CHR
 519          || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
 520                 p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
 521
 522         if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
 523                 args->major = ntohl(*p++);
 524                 args->minor = ntohl(*p++);
 525         }
 526
 527         return xdr_argsize_check(rqstp, p);
 528 }
 529
 530 int
 531 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
 532 {
 533         struct nfsd3_renameargs *args = rqstp->rq_argp;
 534
 535         if (!(p = decode_fh(p, &args->ffh))
 536          || !(p = decode_filename(p, &args->fname, &args->flen))
 537          || !(p = decode_fh(p, &args->tfh))
 538          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 539                 return 0;
 540
 541         return xdr_argsize_check(rqstp, p);
 542 }
 543
 544 int
 545 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
 546 {
 547         struct nfsd3_readlinkargs *args = rqstp->rq_argp;
 548
 549         p = decode_fh(p, &args->fh);
 550         if (!p)
 551                 return 0;
 552         args->buffer = page_address(*(rqstp->rq_next_page++));
 553
 554         return xdr_argsize_check(rqstp, p);
 555 }
 556
 557 int
 558 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
 559 {
 560         struct nfsd3_linkargs *args = rqstp->rq_argp;
 561
 562         if (!(p = decode_fh(p, &args->ffh))
 563          || !(p = decode_fh(p, &args->tfh))
 564          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 565                 return 0;
 566
 567         return xdr_argsize_check(rqstp, p);
 568 }
 569
 570 int
 571 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
 572 {
 573         struct nfsd3_readdirargs *args = rqstp->rq_argp;
 574         int len;
 575         u32 max_blocksize = svc_max_payload(rqstp);
 576
 577         p = decode_fh(p, &args->fh);
 578         if (!p)
 579                 return 0;
 580         p = xdr_decode_hyper(p, &args->cookie);
 581         args->verf   = p; p += 2;
 582         args->dircount = ~0;
 583         args->count  = ntohl(*p++);
 584         len = args->count  = min_t(u32, args->count, max_blocksize);
 585
 586         while (len > 0) {
 587                 struct page *p = *(rqstp->rq_next_page++);
 588                 if (!args->buffer)
 589                         args->buffer = page_address(p);
 590                 len -= PAGE_SIZE;
 591         }
 592
 593         return xdr_argsize_check(rqstp, p);
 594 }
 595
 596 int
 597 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
 598 {
 599         struct nfsd3_readdirargs *args = rqstp->rq_argp;
 600         int len;
 601         u32 max_blocksize = svc_max_payload(rqstp);
 602
 603         p = decode_fh(p, &args->fh);
 604         if (!p)
 605                 return 0;
 606         p = xdr_decode_hyper(p, &args->cookie);
 607         args->verf     = p; p += 2;
 608         args->dircount = ntohl(*p++);
 609         args->count    = ntohl(*p++);
 610
 611         len = args->count = min(args->count, max_blocksize);
 612         while (len > 0) {
 613                 struct page *p = *(rqstp->rq_next_page++);
 614                 if (!args->buffer)
 615                         args->buffer = page_address(p);
 616                 len -= PAGE_SIZE;
 617         }
 618
 619         return xdr_argsize_check(rqstp, p);
 620 }
 621
 622 int
 623 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
 624 {
 625         struct nfsd3_commitargs *args = rqstp->rq_argp;
 626         p = decode_fh(p, &args->fh);
 627         if (!p)
 628                 return 0;
 629         p = xdr_decode_hyper(p, &args->offset);
 630         args->count = ntohl(*p++);
 631
 632         return xdr_argsize_check(rqstp, p);
 633 }
 634
 635 /*
 636  * XDR encode functions
 637  */
 638 /*
 639  * There must be an encoding function for void results so svc_process
 640  * will work properly.
 641  */
 642 int
 643 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
 644 {
 645         return xdr_ressize_check(rqstp, p);
 646 }
 647
 648 /* GETATTR */
 649 int
 650 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
 651 {
 652         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 653
 654         if (resp->status == 0) {
 655                 lease_get_mtime(d_inode(resp->fh.fh_dentry),
 656                                 &resp->stat.mtime);
 657                 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
 658         }
 659         return xdr_ressize_check(rqstp, p);
 660 }
 661
 662 /* SETATTR, REMOVE, RMDIR */
 663 int
 664 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p)
 665 {
 666         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 667
 668         p = encode_wcc_data(rqstp, p, &resp->fh);
 669         return xdr_ressize_check(rqstp, p);
 670 }
 671
 672 /* LOOKUP */
 673 int
 674 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
 675 {
 676         struct nfsd3_diropres *resp = rqstp->rq_resp;
 677
 678         if (resp->status == 0) {
 679                 p = encode_fh(p, &resp->fh);
 680                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 681         }
 682         p = encode_post_op_attr(rqstp, p, &resp->dirfh);
 683         return xdr_ressize_check(rqstp, p);
 684 }
 685
 686 /* ACCESS */
 687 int
 688 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
 689 {
 690         struct nfsd3_accessres *resp = rqstp->rq_resp;
 691
 692         p = encode_post_op_attr(rqstp, p, &resp->fh);
 693         if (resp->status == 0)
 694                 *p++ = htonl(resp->access);
 695         return xdr_ressize_check(rqstp, p);
 696 }
 697
 698 /* READLINK */
 699 int
 700 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
 701 {
 702         struct nfsd3_readlinkres *resp = rqstp->rq_resp;
 703
 704         p = encode_post_op_attr(rqstp, p, &resp->fh);
 705         if (resp->status == 0) {
 706                 *p++ = htonl(resp->len);
 707                 xdr_ressize_check(rqstp, p);
 708                 rqstp->rq_res.page_len = resp->len;
 709                 if (resp->len & 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->len&3);
 714                 }
 715                 return 1;
 716         } else
 717                 return xdr_ressize_check(rqstp, p);
 718 }
 719
 720 /* READ */
 721 int
 722 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
 723 {
 724         struct nfsd3_readres *resp = rqstp->rq_resp;
 725
 726         p = encode_post_op_attr(rqstp, p, &resp->fh);
 727         if (resp->status == 0) {
 728                 *p++ = htonl(resp->count);
 729                 *p++ = htonl(resp->eof);
 730                 *p++ = htonl(resp->count);      /* xdr opaque count */
 731                 xdr_ressize_check(rqstp, p);
 732                 /* now update rqstp->rq_res to reflect data as well */
 733                 rqstp->rq_res.page_len = resp->count;
 734                 if (resp->count & 3) {
 735                         /* need to pad the tail */
 736                         rqstp->rq_res.tail[0].iov_base = p;
 737                         *p = 0;
 738                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
 739                 }
 740                 return 1;
 741         } else
 742                 return xdr_ressize_check(rqstp, p);
 743 }
 744
 745 /* WRITE */
 746 int
 747 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
 748 {
 749         struct nfsd3_writeres *resp = rqstp->rq_resp;
 750
 751         p = encode_wcc_data(rqstp, p, &resp->fh);
 752         if (resp->status == 0) {
 753                 *p++ = htonl(resp->count);
 754                 *p++ = htonl(resp->committed);
 755                 *p++ = resp->verf[0];
 756                 *p++ = resp->verf[1];
 757         }
 758         return xdr_ressize_check(rqstp, p);
 759 }
 760
 761 /* CREATE, MKDIR, SYMLINK, MKNOD */
 762 int
 763 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p)
 764 {
 765         struct nfsd3_diropres *resp = rqstp->rq_resp;
 766
 767         if (resp->status == 0) {
 768                 *p++ = xdr_one;
 769                 p = encode_fh(p, &resp->fh);
 770                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 771         }
 772         p = encode_wcc_data(rqstp, p, &resp->dirfh);
 773         return xdr_ressize_check(rqstp, p);
 774 }
 775
 776 /* RENAME */
 777 int
 778 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p)
 779 {
 780         struct nfsd3_renameres *resp = rqstp->rq_resp;
 781
 782         p = encode_wcc_data(rqstp, p, &resp->ffh);
 783         p = encode_wcc_data(rqstp, p, &resp->tfh);
 784         return xdr_ressize_check(rqstp, p);
 785 }
 786
 787 /* LINK */
 788 int
 789 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p)
 790 {
 791         struct nfsd3_linkres *resp = rqstp->rq_resp;
 792
 793         p = encode_post_op_attr(rqstp, p, &resp->fh);
 794         p = encode_wcc_data(rqstp, p, &resp->tfh);
 795         return xdr_ressize_check(rqstp, p);
 796 }
 797
 798 /* READDIR */
 799 int
 800 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
 801 {
 802         struct nfsd3_readdirres *resp = rqstp->rq_resp;
 803
 804         p = encode_post_op_attr(rqstp, p, &resp->fh);
 805
 806         if (resp->status == 0) {
 807                 /* stupid readdir cookie */
 808                 memcpy(p, resp->verf, 8); p += 2;
 809                 xdr_ressize_check(rqstp, p);
 810                 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
 811                         return 1; /*No room for trailer */
 812                 rqstp->rq_res.page_len = (resp->count) << 2;
 813
 814                 /* add the 'tail' to the end of the 'head' page - page 0. */
 815                 rqstp->rq_res.tail[0].iov_base = p;
 816                 *p++ = 0;               /* no more entries */
 817                 *p++ = htonl(resp->common.err == nfserr_eof);
 818                 rqstp->rq_res.tail[0].iov_len = 2<<2;
 819                 return 1;
 820         } else
 821                 return xdr_ressize_check(rqstp, p);
 822 }
 823
 824 static __be32 *
 825 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
 826              int namlen, u64 ino)
 827 {
 828         *p++ = xdr_one;                          /* mark entry present */
 829         p    = xdr_encode_hyper(p, ino);         /* file id */
 830         p    = xdr_encode_array(p, name, namlen);/* name length & name */
 831
 832         cd->offset = p;                         /* remember pointer */
 833         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
 834
 835         return p;
 836 }
 837
 838 static __be32
 839 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
 840                  const char *name, int namlen, u64 ino)
 841 {
 842         struct svc_export       *exp;
 843         struct dentry           *dparent, *dchild;
 844         __be32 rv = nfserr_noent;
 845
 846         dparent = cd->fh.fh_dentry;
 847         exp  = cd->fh.fh_export;
 848
 849         if (isdotent(name, namlen)) {
 850                 if (namlen == 2) {
 851                         dchild = dget_parent(dparent);
 852                         /* filesystem root - cannot return filehandle for ".." */
 853                         if (dchild == dparent)
 854                                 goto out;
 855                 } else
 856                         dchild = dget(dparent);
 857         } else
 858                 dchild = lookup_positive_unlocked(name, dparent, namlen);
 859         if (IS_ERR(dchild))
 860                 return rv;
 861         if (d_mountpoint(dchild))
 862                 goto out;
 863         if (dchild->d_inode->i_ino != ino)
 864                 goto out;
 865         rv = fh_compose(fhp, exp, dchild, &cd->fh);
 866 out:
 867         dput(dchild);
 868         return rv;
 869 }
 870
 871 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
 872 {
 873         struct svc_fh   *fh = &cd->scratch;
 874         __be32 err;
 875
 876         fh_init(fh, NFS3_FHSIZE);
 877         err = compose_entry_fh(cd, fh, name, namlen, ino);
 878         if (err) {
 879                 *p++ = 0;
 880                 *p++ = 0;
 881                 goto out;
 882         }
 883         p = encode_post_op_attr(cd->rqstp, p, fh);
 884         *p++ = xdr_one;                 /* yes, a file handle follows */
 885         p = encode_fh(p, fh);
 886 out:
 887         fh_put(fh);
 888         return p;
 889 }
 890
 891 /*
 892  * Encode a directory entry. This one works for both normal readdir
 893  * and readdirplus.
 894  * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
 895  * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
 896  *
 897  * The readdirplus baggage is 1+21 words for post_op_attr, plus the
 898  * file handle.
 899  */
 900
 901 #define NFS3_ENTRY_BAGGAGE      (2 + 1 + 2 + 1)
 902 #define NFS3_ENTRYPLUS_BAGGAGE  (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
 903 static int
 904 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
 905              loff_t offset, u64 ino, unsigned int d_type, int plus)
 906 {
 907         struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
 908                                                         common);
 909         __be32          *p = cd->buffer;
 910         caddr_t         curr_page_addr = NULL;
 911         struct page **  page;
 912         int             slen;           /* string (name) length */
 913         int             elen;           /* estimated entry length in words */
 914         int             num_entry_words = 0;    /* actual number of words */
 915
 916         if (cd->offset) {
 917                 u64 offset64 = offset;
 918
 919                 if (unlikely(cd->offset1)) {
 920                         /* we ended up with offset on a page boundary */
 921                         *cd->offset = htonl(offset64 >> 32);
 922                         *cd->offset1 = htonl(offset64 & 0xffffffff);
 923                         cd->offset1 = NULL;
 924                 } else {
 925                         xdr_encode_hyper(cd->offset, offset64);
 926                 }
 927                 cd->offset = NULL;
 928         }
 929
 930         /*
 931         dprintk("encode_entry(%.*s @%ld%s)\n",
 932                 namlen, name, (long) offset, plus? " plus" : "");
 933          */
 934
 935         /* truncate filename if too long */
 936         namlen = min(namlen, NFS3_MAXNAMLEN);
 937
 938         slen = XDR_QUADLEN(namlen);
 939         elen = slen + NFS3_ENTRY_BAGGAGE
 940                 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
 941
 942         if (cd->buflen < elen) {
 943                 cd->common.err = nfserr_toosmall;
 944                 return -EINVAL;
 945         }
 946
 947         /* determine which page in rq_respages[] we are currently filling */
 948         for (page = cd->rqstp->rq_respages + 1;
 949                                 page < cd->rqstp->rq_next_page; page++) {
 950                 curr_page_addr = page_address(*page);
 951
 952                 if (((caddr_t)cd->buffer >= curr_page_addr) &&
 953                     ((caddr_t)cd->buffer <  curr_page_addr + PAGE_SIZE))
 954                         break;
 955         }
 956
 957         if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
 958                 /* encode entry in current page */
 959
 960                 p = encode_entry_baggage(cd, p, name, namlen, ino);
 961
 962                 if (plus)
 963                         p = encode_entryplus_baggage(cd, p, name, namlen, ino);
 964                 num_entry_words = p - cd->buffer;
 965         } else if (*(page+1) != NULL) {
 966                 /* temporarily encode entry into next page, then move back to
 967                  * current and next page in rq_respages[] */
 968                 __be32 *p1, *tmp;
 969                 int len1, len2;
 970
 971                 /* grab next page for temporary storage of entry */
 972                 p1 = tmp = page_address(*(page+1));
 973
 974                 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
 975
 976                 if (plus)
 977                         p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
 978
 979                 /* determine entry word length and lengths to go in pages */
 980                 num_entry_words = p1 - tmp;
 981                 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
 982                 if ((num_entry_words << 2) < len1) {
 983                         /* the actual number of words in the entry is less
 984                          * than elen and can still fit in the current page
 985                          */
 986                         memmove(p, tmp, num_entry_words << 2);
 987                         p += num_entry_words;
 988
 989                         /* update offset */
 990                         cd->offset = cd->buffer + (cd->offset - tmp);
 991                 } else {
 992                         unsigned int offset_r = (cd->offset - tmp) << 2;
 993
 994                         /* update pointer to offset location.
 995                          * This is a 64bit quantity, so we need to
 996                          * deal with 3 cases:
 997                          *  -   entirely in first page
 998                          *  -   entirely in second page
 999                          *  -   4 bytes in each page
1000                          */
1001                         if (offset_r + 8 <= len1) {
1002                                 cd->offset = p + (cd->offset - tmp);
1003                         } else if (offset_r >= len1) {
1004                                 cd->offset -= len1 >> 2;
1005                         } else {
1006                                 /* sitting on the fence */
1007                                 BUG_ON(offset_r != len1 - 4);
1008                                 cd->offset = p + (cd->offset - tmp);
1009                                 cd->offset1 = tmp;
1010                         }
1011
1012                         len2 = (num_entry_words << 2) - len1;
1013
1014                         /* move from temp page to current and next pages */
1015                         memmove(p, tmp, len1);
1016                         memmove(tmp, (caddr_t)tmp+len1, len2);
1017
1018                         p = tmp + (len2 >> 2);
1019                 }
1020         }
1021         else {
1022                 cd->common.err = nfserr_toosmall;
1023                 return -EINVAL;
1024         }
1025
1026         cd->buflen -= num_entry_words;
1027         cd->buffer = p;
1028         cd->common.err = nfs_ok;
1029         return 0;
1030
1031 }
1032
1033 int
1034 nfs3svc_encode_entry(void *cd, const char *name,
1035                      int namlen, loff_t offset, u64 ino, unsigned int d_type)
1036 {
1037         return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1038 }
1039
1040 int
1041 nfs3svc_encode_entry_plus(void *cd, const char *name,
1042                           int namlen, loff_t offset, u64 ino,
1043                           unsigned int d_type)
1044 {
1045         return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1046 }
1047
1048 /* FSSTAT */
1049 int
1050 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p)
1051 {
1052         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
1053         struct kstatfs  *s = &resp->stats;
1054         u64             bs = s->f_bsize;
1055
1056         *p++ = xdr_zero;        /* no post_op_attr */
1057
1058         if (resp->status == 0) {
1059                 p = xdr_encode_hyper(p, bs * s->f_blocks);      /* total bytes */
1060                 p = xdr_encode_hyper(p, bs * s->f_bfree);       /* free bytes */
1061                 p = xdr_encode_hyper(p, bs * s->f_bavail);      /* user available bytes */
1062                 p = xdr_encode_hyper(p, s->f_files);    /* total inodes */
1063                 p = xdr_encode_hyper(p, s->f_ffree);    /* free inodes */
1064                 p = xdr_encode_hyper(p, s->f_ffree);    /* user available inodes */
1065                 *p++ = htonl(resp->invarsec);   /* mean unchanged time */
1066         }
1067         return xdr_ressize_check(rqstp, p);
1068 }
1069
1070 /* FSINFO */
1071 int
1072 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p)
1073 {
1074         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
1075
1076         *p++ = xdr_zero;        /* no post_op_attr */
1077
1078         if (resp->status == 0) {
1079                 *p++ = htonl(resp->f_rtmax);
1080                 *p++ = htonl(resp->f_rtpref);
1081                 *p++ = htonl(resp->f_rtmult);
1082                 *p++ = htonl(resp->f_wtmax);
1083                 *p++ = htonl(resp->f_wtpref);
1084                 *p++ = htonl(resp->f_wtmult);
1085                 *p++ = htonl(resp->f_dtpref);
1086                 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1087                 *p++ = xdr_one;
1088                 *p++ = xdr_zero;
1089                 *p++ = htonl(resp->f_properties);
1090         }
1091
1092         return xdr_ressize_check(rqstp, p);
1093 }
1094
1095 /* PATHCONF */
1096 int
1097 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p)
1098 {
1099         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
1100
1101         *p++ = xdr_zero;        /* no post_op_attr */
1102
1103         if (resp->status == 0) {
1104                 *p++ = htonl(resp->p_link_max);
1105                 *p++ = htonl(resp->p_name_max);
1106                 *p++ = htonl(resp->p_no_trunc);
1107                 *p++ = htonl(resp->p_chown_restricted);
1108                 *p++ = htonl(resp->p_case_insensitive);
1109                 *p++ = htonl(resp->p_case_preserving);
1110         }
1111
1112         return xdr_ressize_check(rqstp, p);
1113 }
1114
1115 /* COMMIT */
1116 int
1117 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
1118 {
1119         struct nfsd3_commitres *resp = rqstp->rq_resp;
1120
1121         p = encode_wcc_data(rqstp, p, &resp->fh);
1122         /* Write verifier */
1123         if (resp->status == 0) {
1124                 *p++ = resp->verf[0];
1125                 *p++ = resp->verf[1];
1126         }
1127         return xdr_ressize_check(rqstp, p);
1128 }
1129
1130 /*
1131  * XDR release functions
1132  */
1133 void
1134 nfs3svc_release_fhandle(struct svc_rqst *rqstp)
1135 {
1136         struct nfsd3_attrstat *resp = rqstp->rq_resp;
1137
1138         fh_put(&resp->fh);
1139 }
1140
1141 void
1142 nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
1143 {
1144         struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;
1145
1146         fh_put(&resp->fh1);
1147         fh_put(&resp->fh2);
1148 }