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  * XDR functions for basic NFS types
  32  */
  33 static __be32 *
  34 encode_time3(__be32 *p, struct timespec *time)
  35 {
  36         *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
  37         return p;
  38 }
  39
  40 static __be32 *
  41 decode_time3(__be32 *p, struct timespec *time)
  42 {
  43         time->tv_sec = ntohl(*p++);
  44         time->tv_nsec = ntohl(*p++);
  45         return p;
  46 }
  47
  48 static __be32 *
  49 decode_fh(__be32 *p, struct svc_fh *fhp)
  50 {
  51         unsigned int size;
  52         fh_init(fhp, NFS3_FHSIZE);
  53         size = ntohl(*p++);
  54         if (size > NFS3_FHSIZE)
  55                 return NULL;
  56
  57         memcpy(&fhp->fh_handle.fh_base, p, size);
  58         fhp->fh_handle.fh_size = size;
  59         return p + XDR_QUADLEN(size);
  60 }
  61
  62 /* Helper function for NFSv3 ACL code */
  63 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
  64 {
  65         return decode_fh(p, fhp);
  66 }
  67
  68 static __be32 *
  69 encode_fh(__be32 *p, struct svc_fh *fhp)
  70 {
  71         unsigned int size = fhp->fh_handle.fh_size;
  72         *p++ = htonl(size);
  73         if (size) p[XDR_QUADLEN(size)-1]=0;
  74         memcpy(p, &fhp->fh_handle.fh_base, size);
  75         return p + XDR_QUADLEN(size);
  76 }
  77
  78 /*
  79  * Decode a file name and make sure that the path contains
  80  * no slashes or null bytes.
  81  */
  82 static __be32 *
  83 decode_filename(__be32 *p, char **namp, unsigned int *lenp)
  84 {
  85         char            *name;
  86         unsigned int    i;
  87
  88         if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
  89                 for (i = 0, name = *namp; i < *lenp; i++, name++) {
  90                         if (*name == '\0' || *name == '/')
  91                                 return NULL;
  92                 }
  93         }
  94
  95         return p;
  96 }
  97
  98 static __be32 *
  99 decode_sattr3(__be32 *p, struct iattr *iap)
 100 {
 101         u32     tmp;
 102
 103         iap->ia_valid = 0;
 104
 105         if (*p++) {
 106                 iap->ia_valid |= ATTR_MODE;
 107                 iap->ia_mode = ntohl(*p++);
 108         }
 109         if (*p++) {
 110                 iap->ia_uid = make_kuid(&init_user_ns, ntohl(*p++));
 111                 if (uid_valid(iap->ia_uid))
 112                         iap->ia_valid |= ATTR_UID;
 113         }
 114         if (*p++) {
 115                 iap->ia_gid = make_kgid(&init_user_ns, ntohl(*p++));
 116                 if (gid_valid(iap->ia_gid))
 117                         iap->ia_valid |= ATTR_GID;
 118         }
 119         if (*p++) {
 120                 u64     newsize;
 121
 122                 iap->ia_valid |= ATTR_SIZE;
 123                 p = xdr_decode_hyper(p, &newsize);
 124                 iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
 125         }
 126         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 127                 iap->ia_valid |= ATTR_ATIME;
 128         } else if (tmp == 2) {          /* set to client time */
 129                 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
 130                 iap->ia_atime.tv_sec = ntohl(*p++);
 131                 iap->ia_atime.tv_nsec = ntohl(*p++);
 132         }
 133         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 134                 iap->ia_valid |= ATTR_MTIME;
 135         } else if (tmp == 2) {          /* set to client time */
 136                 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
 137                 iap->ia_mtime.tv_sec = ntohl(*p++);
 138                 iap->ia_mtime.tv_nsec = ntohl(*p++);
 139         }
 140         return p;
 141 }
 142
 143 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
 144 {
 145         u64 f;
 146         switch(fsid_source(fhp)) {
 147         default:
 148         case FSIDSOURCE_DEV:
 149                 p = xdr_encode_hyper(p, (u64)huge_encode_dev
 150                                      (fhp->fh_dentry->d_sb->s_dev));
 151                 break;
 152         case FSIDSOURCE_FSID:
 153                 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
 154                 break;
 155         case FSIDSOURCE_UUID:
 156                 f = ((u64*)fhp->fh_export->ex_uuid)[0];
 157                 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
 158                 p = xdr_encode_hyper(p, f);
 159                 break;
 160         }
 161         return p;
 162 }
 163
 164 static __be32 *
 165 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
 166               struct kstat *stat)
 167 {
 168         struct timespec ts;
 169         *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
 170         *p++ = htonl((u32) (stat->mode & S_IALLUGO));
 171         *p++ = htonl((u32) stat->nlink);
 172         *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
 173         *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
 174         if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
 175                 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
 176         } else {
 177                 p = xdr_encode_hyper(p, (u64) stat->size);
 178         }
 179         p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
 180         *p++ = htonl((u32) MAJOR(stat->rdev));
 181         *p++ = htonl((u32) MINOR(stat->rdev));
 182         p = encode_fsid(p, fhp);
 183         p = xdr_encode_hyper(p, stat->ino);
 184         ts = timespec64_to_timespec(stat->atime);
 185         p = encode_time3(p, &ts);
 186         ts = timespec64_to_timespec(stat->mtime);
 187         p = encode_time3(p, &ts);
 188         ts = timespec64_to_timespec(stat->ctime);
 189         p = encode_time3(p, &ts);
 190
 191         return p;
 192 }
 193
 194 static __be32 *
 195 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 196 {
 197         /* Attributes to follow */
 198         *p++ = xdr_one;
 199         return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
 200 }
 201
 202 /*
 203  * Encode post-operation attributes.
 204  * The inode may be NULL if the call failed because of a stale file
 205  * handle. In this case, no attributes are returned.
 206  */
 207 static __be32 *
 208 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 209 {
 210         struct dentry *dentry = fhp->fh_dentry;
 211         if (dentry && d_really_is_positive(dentry)) {
 212                 __be32 err;
 213                 struct kstat stat;
 214
 215                 err = fh_getattr(fhp, &stat);
 216                 if (!err) {
 217                         *p++ = xdr_one;         /* attributes follow */
 218                         lease_get_mtime(d_inode(dentry), &stat.mtime);
 219                         return encode_fattr3(rqstp, p, fhp, &stat);
 220                 }
 221         }
 222         *p++ = xdr_zero;
 223         return p;
 224 }
 225
 226 /* Helper for NFSv3 ACLs */
 227 __be32 *
 228 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 229 {
 230         return encode_post_op_attr(rqstp, p, fhp);
 231 }
 232
 233 /*
 234  * Enocde weak cache consistency data
 235  */
 236 static __be32 *
 237 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 238 {
 239         struct dentry   *dentry = fhp->fh_dentry;
 240
 241         if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
 242                 if (fhp->fh_pre_saved) {
 243                         *p++ = xdr_one;
 244                         p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
 245                         p = encode_time3(p, &fhp->fh_pre_mtime);
 246                         p = encode_time3(p, &fhp->fh_pre_ctime);
 247                 } else {
 248                         *p++ = xdr_zero;
 249                 }
 250                 return encode_saved_post_attr(rqstp, p, fhp);
 251         }
 252         /* no pre- or post-attrs */
 253         *p++ = xdr_zero;
 254         return encode_post_op_attr(rqstp, p, fhp);
 255 }
 256
 257 /*
 258  * Fill in the pre_op attr for the wcc data
 259  */
 260 void fill_pre_wcc(struct svc_fh *fhp)
 261 {
 262         struct inode    *inode;
 263         struct kstat    stat;
 264         __be32 err;
 265
 266         if (fhp->fh_pre_saved)
 267                 return;
 268
 269         inode = d_inode(fhp->fh_dentry);
 270         err = fh_getattr(fhp, &stat);
 271         if (err) {
 272                 /* Grab the times from inode anyway */
 273                 stat.mtime = inode->i_mtime;
 274                 stat.ctime = inode->i_ctime;
 275                 stat.size  = inode->i_size;
 276         }
 277
 278         fhp->fh_pre_mtime = timespec64_to_timespec(stat.mtime);
 279         fhp->fh_pre_ctime = timespec64_to_timespec(stat.ctime);
 280         fhp->fh_pre_size  = stat.size;
 281         fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode);
 282         fhp->fh_pre_saved = true;
 283 }
 284
 285 /*
 286  * Fill in the post_op attr for the wcc data
 287  */
 288 void fill_post_wcc(struct svc_fh *fhp)
 289 {
 290         __be32 err;
 291
 292         if (fhp->fh_post_saved)
 293                 printk("nfsd: inode locked twice during operation.\n");
 294
 295         err = fh_getattr(fhp, &fhp->fh_post_attr);
 296         fhp->fh_post_change = nfsd4_change_attribute(&fhp->fh_post_attr,
 297                                                      d_inode(fhp->fh_dentry));
 298         if (err) {
 299                 fhp->fh_post_saved = false;
 300                 /* Grab the ctime anyway - set_change_info might use it */
 301                 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
 302         } else
 303                 fhp->fh_post_saved = true;
 304 }
 305
 306 /*
 307  * XDR decode functions
 308  */
 309 int
 310 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
 311 {
 312         struct nfsd_fhandle *args = rqstp->rq_argp;
 313
 314         p = decode_fh(p, &args->fh);
 315         if (!p)
 316                 return 0;
 317         return xdr_argsize_check(rqstp, p);
 318 }
 319
 320 int
 321 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
 322 {
 323         struct nfsd3_sattrargs *args = rqstp->rq_argp;
 324
 325         p = decode_fh(p, &args->fh);
 326         if (!p)
 327                 return 0;
 328         p = decode_sattr3(p, &args->attrs);
 329
 330         if ((args->check_guard = ntohl(*p++)) != 0) {
 331                 struct timespec time;
 332                 p = decode_time3(p, &time);
 333                 args->guardtime = time.tv_sec;
 334         }
 335
 336         return xdr_argsize_check(rqstp, p);
 337 }
 338
 339 int
 340 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
 341 {
 342         struct nfsd3_diropargs *args = rqstp->rq_argp;
 343
 344         if (!(p = decode_fh(p, &args->fh))
 345          || !(p = decode_filename(p, &args->name, &args->len)))
 346                 return 0;
 347
 348         return xdr_argsize_check(rqstp, p);
 349 }
 350
 351 int
 352 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
 353 {
 354         struct nfsd3_accessargs *args = rqstp->rq_argp;
 355
 356         p = decode_fh(p, &args->fh);
 357         if (!p)
 358                 return 0;
 359         args->access = ntohl(*p++);
 360
 361         return xdr_argsize_check(rqstp, p);
 362 }
 363
 364 int
 365 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
 366 {
 367         struct nfsd3_readargs *args = rqstp->rq_argp;
 368         unsigned int len;
 369         int v;
 370         u32 max_blocksize = svc_max_payload(rqstp);
 371
 372         p = decode_fh(p, &args->fh);
 373         if (!p)
 374                 return 0;
 375         p = xdr_decode_hyper(p, &args->offset);
 376
 377         args->count = ntohl(*p++);
 378         len = min(args->count, max_blocksize);
 379
 380         /* set up the kvec */
 381         v=0;
 382         while (len > 0) {
 383                 struct page *p = *(rqstp->rq_next_page++);
 384
 385                 rqstp->rq_vec[v].iov_base = page_address(p);
 386                 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
 387                 len -= rqstp->rq_vec[v].iov_len;
 388                 v++;
 389         }
 390         args->vlen = v;
 391         return xdr_argsize_check(rqstp, p);
 392 }
 393
 394 int
 395 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
 396 {
 397         struct nfsd3_writeargs *args = rqstp->rq_argp;
 398         unsigned int len, hdr, dlen;
 399         u32 max_blocksize = svc_max_payload(rqstp);
 400         struct kvec *head = rqstp->rq_arg.head;
 401         struct kvec *tail = rqstp->rq_arg.tail;
 402
 403         p = decode_fh(p, &args->fh);
 404         if (!p)
 405                 return 0;
 406         p = xdr_decode_hyper(p, &args->offset);
 407
 408         args->count = ntohl(*p++);
 409         args->stable = ntohl(*p++);
 410         len = args->len = ntohl(*p++);
 411         if ((void *)p > head->iov_base + head->iov_len)
 412                 return 0;
 413         /*
 414          * The count must equal the amount of data passed.
 415          */
 416         if (args->count != args->len)
 417                 return 0;
 418
 419         /*
 420          * Check to make sure that we got the right number of
 421          * bytes.
 422          */
 423         hdr = (void*)p - head->iov_base;
 424         dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr;
 425         /*
 426          * Round the length of the data which was specified up to
 427          * the next multiple of XDR units and then compare that
 428          * against the length which was actually received.
 429          * Note that when RPCSEC/GSS (for example) is used, the
 430          * data buffer can be padded so dlen might be larger
 431          * than required.  It must never be smaller.
 432          */
 433         if (dlen < XDR_QUADLEN(len)*4)
 434                 return 0;
 435
 436         if (args->count > max_blocksize) {
 437                 args->count = max_blocksize;
 438                 len = args->len = max_blocksize;
 439         }
 440
 441         args->first.iov_base = (void *)p;
 442         args->first.iov_len = head->iov_len - hdr;
 443         return 1;
 444 }
 445
 446 int
 447 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
 448 {
 449         struct nfsd3_createargs *args = rqstp->rq_argp;
 450
 451         if (!(p = decode_fh(p, &args->fh))
 452          || !(p = decode_filename(p, &args->name, &args->len)))
 453                 return 0;
 454
 455         switch (args->createmode = ntohl(*p++)) {
 456         case NFS3_CREATE_UNCHECKED:
 457         case NFS3_CREATE_GUARDED:
 458                 p = decode_sattr3(p, &args->attrs);
 459                 break;
 460         case NFS3_CREATE_EXCLUSIVE:
 461                 args->verf = p;
 462                 p += 2;
 463                 break;
 464         default:
 465                 return 0;
 466         }
 467
 468         return xdr_argsize_check(rqstp, p);
 469 }
 470
 471 int
 472 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
 473 {
 474         struct nfsd3_createargs *args = rqstp->rq_argp;
 475
 476         if (!(p = decode_fh(p, &args->fh)) ||
 477             !(p = decode_filename(p, &args->name, &args->len)))
 478                 return 0;
 479         p = decode_sattr3(p, &args->attrs);
 480
 481         return xdr_argsize_check(rqstp, p);
 482 }
 483
 484 int
 485 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
 486 {
 487         struct nfsd3_symlinkargs *args = rqstp->rq_argp;
 488         char *base = (char *)p;
 489         size_t dlen;
 490
 491         if (!(p = decode_fh(p, &args->ffh)) ||
 492             !(p = decode_filename(p, &args->fname, &args->flen)))
 493                 return 0;
 494         p = decode_sattr3(p, &args->attrs);
 495
 496         args->tlen = ntohl(*p++);
 497
 498         args->first.iov_base = p;
 499         args->first.iov_len = rqstp->rq_arg.head[0].iov_len;
 500         args->first.iov_len -= (char *)p - base;
 501
 502         dlen = args->first.iov_len + rqstp->rq_arg.page_len +
 503                rqstp->rq_arg.tail[0].iov_len;
 504         if (dlen < XDR_QUADLEN(args->tlen) << 2)
 505                 return 0;
 506         return 1;
 507 }
 508
 509 int
 510 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
 511 {
 512         struct nfsd3_mknodargs *args = rqstp->rq_argp;
 513
 514         if (!(p = decode_fh(p, &args->fh))
 515          || !(p = decode_filename(p, &args->name, &args->len)))
 516                 return 0;
 517
 518         args->ftype = ntohl(*p++);
 519
 520         if (args->ftype == NF3BLK  || args->ftype == NF3CHR
 521          || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
 522                 p = decode_sattr3(p, &args->attrs);
 523
 524         if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
 525                 args->major = ntohl(*p++);
 526                 args->minor = ntohl(*p++);
 527         }
 528
 529         return xdr_argsize_check(rqstp, p);
 530 }
 531
 532 int
 533 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
 534 {
 535         struct nfsd3_renameargs *args = rqstp->rq_argp;
 536
 537         if (!(p = decode_fh(p, &args->ffh))
 538          || !(p = decode_filename(p, &args->fname, &args->flen))
 539          || !(p = decode_fh(p, &args->tfh))
 540          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 541                 return 0;
 542
 543         return xdr_argsize_check(rqstp, p);
 544 }
 545
 546 int
 547 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
 548 {
 549         struct nfsd3_readlinkargs *args = rqstp->rq_argp;
 550
 551         p = decode_fh(p, &args->fh);
 552         if (!p)
 553                 return 0;
 554         args->buffer = page_address(*(rqstp->rq_next_page++));
 555
 556         return xdr_argsize_check(rqstp, p);
 557 }
 558
 559 int
 560 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
 561 {
 562         struct nfsd3_linkargs *args = rqstp->rq_argp;
 563
 564         if (!(p = decode_fh(p, &args->ffh))
 565          || !(p = decode_fh(p, &args->tfh))
 566          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 567                 return 0;
 568
 569         return xdr_argsize_check(rqstp, p);
 570 }
 571
 572 int
 573 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
 574 {
 575         struct nfsd3_readdirargs *args = rqstp->rq_argp;
 576         u32 max_blocksize = svc_max_payload(rqstp);
 577
 578         p = decode_fh(p, &args->fh);
 579         if (!p)
 580                 return 0;
 581         p = xdr_decode_hyper(p, &args->cookie);
 582         args->verf   = p; p += 2;
 583         args->dircount = ~0;
 584         args->count  = ntohl(*p++);
 585         args->count  = min_t(u32, args->count, max_blocksize);
 586         args->buffer = page_address(*(rqstp->rq_next_page++));
 587
 588         return xdr_argsize_check(rqstp, p);
 589 }
 590
 591 int
 592 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
 593 {
 594         struct nfsd3_readdirargs *args = rqstp->rq_argp;
 595         int len;
 596         u32 max_blocksize = svc_max_payload(rqstp);
 597
 598         p = decode_fh(p, &args->fh);
 599         if (!p)
 600                 return 0;
 601         p = xdr_decode_hyper(p, &args->cookie);
 602         args->verf     = p; p += 2;
 603         args->dircount = ntohl(*p++);
 604         args->count    = ntohl(*p++);
 605
 606         len = args->count = min(args->count, max_blocksize);
 607         while (len > 0) {
 608                 struct page *p = *(rqstp->rq_next_page++);
 609                 if (!args->buffer)
 610                         args->buffer = page_address(p);
 611                 len -= PAGE_SIZE;
 612         }
 613
 614         return xdr_argsize_check(rqstp, p);
 615 }
 616
 617 int
 618 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
 619 {
 620         struct nfsd3_commitargs *args = rqstp->rq_argp;
 621         p = decode_fh(p, &args->fh);
 622         if (!p)
 623                 return 0;
 624         p = xdr_decode_hyper(p, &args->offset);
 625         args->count = ntohl(*p++);
 626
 627         return xdr_argsize_check(rqstp, p);
 628 }
 629
 630 /*
 631  * XDR encode functions
 632  */
 633 /*
 634  * There must be an encoding function for void results so svc_process
 635  * will work properly.
 636  */
 637 int
 638 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
 639 {
 640         return xdr_ressize_check(rqstp, p);
 641 }
 642
 643 /* GETATTR */
 644 int
 645 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
 646 {
 647         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 648
 649         if (resp->status == 0) {
 650                 lease_get_mtime(d_inode(resp->fh.fh_dentry),
 651                                 &resp->stat.mtime);
 652                 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
 653         }
 654         return xdr_ressize_check(rqstp, p);
 655 }
 656
 657 /* SETATTR, REMOVE, RMDIR */
 658 int
 659 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p)
 660 {
 661         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 662
 663         p = encode_wcc_data(rqstp, p, &resp->fh);
 664         return xdr_ressize_check(rqstp, p);
 665 }
 666
 667 /* LOOKUP */
 668 int
 669 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
 670 {
 671         struct nfsd3_diropres *resp = rqstp->rq_resp;
 672
 673         if (resp->status == 0) {
 674                 p = encode_fh(p, &resp->fh);
 675                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 676         }
 677         p = encode_post_op_attr(rqstp, p, &resp->dirfh);
 678         return xdr_ressize_check(rqstp, p);
 679 }
 680
 681 /* ACCESS */
 682 int
 683 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
 684 {
 685         struct nfsd3_accessres *resp = rqstp->rq_resp;
 686
 687         p = encode_post_op_attr(rqstp, p, &resp->fh);
 688         if (resp->status == 0)
 689                 *p++ = htonl(resp->access);
 690         return xdr_ressize_check(rqstp, p);
 691 }
 692
 693 /* READLINK */
 694 int
 695 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
 696 {
 697         struct nfsd3_readlinkres *resp = rqstp->rq_resp;
 698
 699         p = encode_post_op_attr(rqstp, p, &resp->fh);
 700         if (resp->status == 0) {
 701                 *p++ = htonl(resp->len);
 702                 xdr_ressize_check(rqstp, p);
 703                 rqstp->rq_res.page_len = resp->len;
 704                 if (resp->len & 3) {
 705                         /* need to pad the tail */
 706                         rqstp->rq_res.tail[0].iov_base = p;
 707                         *p = 0;
 708                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
 709                 }
 710                 return 1;
 711         } else
 712                 return xdr_ressize_check(rqstp, p);
 713 }
 714
 715 /* READ */
 716 int
 717 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
 718 {
 719         struct nfsd3_readres *resp = rqstp->rq_resp;
 720
 721         p = encode_post_op_attr(rqstp, p, &resp->fh);
 722         if (resp->status == 0) {
 723                 *p++ = htonl(resp->count);
 724                 *p++ = htonl(resp->eof);
 725                 *p++ = htonl(resp->count);      /* xdr opaque count */
 726                 xdr_ressize_check(rqstp, p);
 727                 /* now update rqstp->rq_res to reflect data as well */
 728                 rqstp->rq_res.page_len = resp->count;
 729                 if (resp->count & 3) {
 730                         /* need to pad the tail */
 731                         rqstp->rq_res.tail[0].iov_base = p;
 732                         *p = 0;
 733                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
 734                 }
 735                 return 1;
 736         } else
 737                 return xdr_ressize_check(rqstp, p);
 738 }
 739
 740 /* WRITE */
 741 int
 742 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
 743 {
 744         struct nfsd3_writeres *resp = rqstp->rq_resp;
 745         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 746
 747         p = encode_wcc_data(rqstp, p, &resp->fh);
 748         if (resp->status == 0) {
 749                 *p++ = htonl(resp->count);
 750                 *p++ = htonl(resp->committed);
 751                 /* unique identifier, y2038 overflow can be ignored */
 752                 *p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
 753                 *p++ = htonl(nn->nfssvc_boot.tv_nsec);
 754         }
 755         return xdr_ressize_check(rqstp, p);
 756 }
 757
 758 /* CREATE, MKDIR, SYMLINK, MKNOD */
 759 int
 760 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p)
 761 {
 762         struct nfsd3_diropres *resp = rqstp->rq_resp;
 763
 764         if (resp->status == 0) {
 765                 *p++ = xdr_one;
 766                 p = encode_fh(p, &resp->fh);
 767                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 768         }
 769         p = encode_wcc_data(rqstp, p, &resp->dirfh);
 770         return xdr_ressize_check(rqstp, p);
 771 }
 772
 773 /* RENAME */
 774 int
 775 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p)
 776 {
 777         struct nfsd3_renameres *resp = rqstp->rq_resp;
 778
 779         p = encode_wcc_data(rqstp, p, &resp->ffh);
 780         p = encode_wcc_data(rqstp, p, &resp->tfh);
 781         return xdr_ressize_check(rqstp, p);
 782 }
 783
 784 /* LINK */
 785 int
 786 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p)
 787 {
 788         struct nfsd3_linkres *resp = rqstp->rq_resp;
 789
 790         p = encode_post_op_attr(rqstp, p, &resp->fh);
 791         p = encode_wcc_data(rqstp, p, &resp->tfh);
 792         return xdr_ressize_check(rqstp, p);
 793 }
 794
 795 /* READDIR */
 796 int
 797 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
 798 {
 799         struct nfsd3_readdirres *resp = rqstp->rq_resp;
 800
 801         p = encode_post_op_attr(rqstp, p, &resp->fh);
 802
 803         if (resp->status == 0) {
 804                 /* stupid readdir cookie */
 805                 memcpy(p, resp->verf, 8); p += 2;
 806                 xdr_ressize_check(rqstp, p);
 807                 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
 808                         return 1; /*No room for trailer */
 809                 rqstp->rq_res.page_len = (resp->count) << 2;
 810
 811                 /* add the 'tail' to the end of the 'head' page - page 0. */
 812                 rqstp->rq_res.tail[0].iov_base = p;
 813                 *p++ = 0;               /* no more entries */
 814                 *p++ = htonl(resp->common.err == nfserr_eof);
 815                 rqstp->rq_res.tail[0].iov_len = 2<<2;
 816                 return 1;
 817         } else
 818                 return xdr_ressize_check(rqstp, p);
 819 }
 820
 821 static __be32 *
 822 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
 823              int namlen, u64 ino)
 824 {
 825         *p++ = xdr_one;                          /* mark entry present */
 826         p    = xdr_encode_hyper(p, ino);         /* file id */
 827         p    = xdr_encode_array(p, name, namlen);/* name length & name */
 828
 829         cd->offset = p;                         /* remember pointer */
 830         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
 831
 832         return p;
 833 }
 834
 835 static __be32
 836 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
 837                  const char *name, int namlen, u64 ino)
 838 {
 839         struct svc_export       *exp;
 840         struct dentry           *dparent, *dchild;
 841         __be32 rv = nfserr_noent;
 842
 843         dparent = cd->fh.fh_dentry;
 844         exp  = cd->fh.fh_export;
 845
 846         if (isdotent(name, namlen)) {
 847                 if (namlen == 2) {
 848                         dchild = dget_parent(dparent);
 849                         /* filesystem root - cannot return filehandle for ".." */
 850                         if (dchild == dparent)
 851                                 goto out;
 852                 } else
 853                         dchild = dget(dparent);
 854         } else
 855                 dchild = lookup_one_len_unlocked(name, dparent, namlen);
 856         if (IS_ERR(dchild))
 857                 return rv;
 858         if (d_mountpoint(dchild))
 859                 goto out;
 860         if (d_really_is_negative(dchild))
 861                 goto out;
 862         if (dchild->d_inode->i_ino != ino)
 863                 goto out;
 864         rv = fh_compose(fhp, exp, dchild, &cd->fh);
 865 out:
 866         dput(dchild);
 867         return rv;
 868 }
 869
 870 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
 871 {
 872         struct svc_fh   *fh = &cd->scratch;
 873         __be32 err;
 874
 875         fh_init(fh, NFS3_FHSIZE);
 876         err = compose_entry_fh(cd, fh, name, namlen, ino);
 877         if (err) {
 878                 *p++ = 0;
 879                 *p++ = 0;
 880                 goto out;
 881         }
 882         p = encode_post_op_attr(cd->rqstp, p, fh);
 883         *p++ = xdr_one;                 /* yes, a file handle follows */
 884         p = encode_fh(p, fh);
 885 out:
 886         fh_put(fh);
 887         return p;
 888 }
 889
 890 /*
 891  * Encode a directory entry. This one works for both normal readdir
 892  * and readdirplus.
 893  * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
 894  * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
 895  *
 896  * The readdirplus baggage is 1+21 words for post_op_attr, plus the
 897  * file handle.
 898  */
 899
 900 #define NFS3_ENTRY_BAGGAGE      (2 + 1 + 2 + 1)
 901 #define NFS3_ENTRYPLUS_BAGGAGE  (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
 902 static int
 903 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
 904              loff_t offset, u64 ino, unsigned int d_type, int plus)
 905 {
 906         struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
 907                                                         common);
 908         __be32          *p = cd->buffer;
 909         caddr_t         curr_page_addr = NULL;
 910         struct page **  page;
 911         int             slen;           /* string (name) length */
 912         int             elen;           /* estimated entry length in words */
 913         int             num_entry_words = 0;    /* actual number of words */
 914
 915         if (cd->offset) {
 916                 u64 offset64 = offset;
 917
 918                 if (unlikely(cd->offset1)) {
 919                         /* we ended up with offset on a page boundary */
 920                         *cd->offset = htonl(offset64 >> 32);
 921                         *cd->offset1 = htonl(offset64 & 0xffffffff);
 922                         cd->offset1 = NULL;
 923                 } else {
 924                         xdr_encode_hyper(cd->offset, offset64);
 925                 }
 926                 cd->offset = NULL;
 927         }
 928
 929         /*
 930         dprintk("encode_entry(%.*s @%ld%s)\n",
 931                 namlen, name, (long) offset, plus? " plus" : "");
 932          */
 933
 934         /* truncate filename if too long */
 935         namlen = min(namlen, NFS3_MAXNAMLEN);
 936
 937         slen = XDR_QUADLEN(namlen);
 938         elen = slen + NFS3_ENTRY_BAGGAGE
 939                 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
 940
 941         if (cd->buflen < elen) {
 942                 cd->common.err = nfserr_toosmall;
 943                 return -EINVAL;
 944         }
 945
 946         /* determine which page in rq_respages[] we are currently filling */
 947         for (page = cd->rqstp->rq_respages + 1;
 948                                 page < cd->rqstp->rq_next_page; page++) {
 949                 curr_page_addr = page_address(*page);
 950
 951                 if (((caddr_t)cd->buffer >= curr_page_addr) &&
 952                     ((caddr_t)cd->buffer <  curr_page_addr + PAGE_SIZE))
 953                         break;
 954         }
 955
 956         if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
 957                 /* encode entry in current page */
 958
 959                 p = encode_entry_baggage(cd, p, name, namlen, ino);
 960
 961                 if (plus)
 962                         p = encode_entryplus_baggage(cd, p, name, namlen, ino);
 963                 num_entry_words = p - cd->buffer;
 964         } else if (*(page+1) != NULL) {
 965                 /* temporarily encode entry into next page, then move back to
 966                  * current and next page in rq_respages[] */
 967                 __be32 *p1, *tmp;
 968                 int len1, len2;
 969
 970                 /* grab next page for temporary storage of entry */
 971                 p1 = tmp = page_address(*(page+1));
 972
 973                 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
 974
 975                 if (plus)
 976                         p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
 977
 978                 /* determine entry word length and lengths to go in pages */
 979                 num_entry_words = p1 - tmp;
 980                 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
 981                 if ((num_entry_words << 2) < len1) {
 982                         /* the actual number of words in the entry is less
 983                          * than elen and can still fit in the current page
 984                          */
 985                         memmove(p, tmp, num_entry_words << 2);
 986                         p += num_entry_words;
 987
 988                         /* update offset */
 989                         cd->offset = cd->buffer + (cd->offset - tmp);
 990                 } else {
 991                         unsigned int offset_r = (cd->offset - tmp) << 2;
 992
 993                         /* update pointer to offset location.
 994                          * This is a 64bit quantity, so we need to
 995                          * deal with 3 cases:
 996                          *  -   entirely in first page
 997                          *  -   entirely in second page
 998                          *  -   4 bytes in each page
 999                          */
1000                         if (offset_r + 8 <= len1) {
1001                                 cd->offset = p + (cd->offset - tmp);
1002                         } else if (offset_r >= len1) {
1003                                 cd->offset -= len1 >> 2;
1004                         } else {
1005                                 /* sitting on the fence */
1006                                 BUG_ON(offset_r != len1 - 4);
1007                                 cd->offset = p + (cd->offset - tmp);
1008                                 cd->offset1 = tmp;
1009                         }
1010
1011                         len2 = (num_entry_words << 2) - len1;
1012
1013                         /* move from temp page to current and next pages */
1014                         memmove(p, tmp, len1);
1015                         memmove(tmp, (caddr_t)tmp+len1, len2);
1016
1017                         p = tmp + (len2 >> 2);
1018                 }
1019         }
1020         else {
1021                 cd->common.err = nfserr_toosmall;
1022                 return -EINVAL;
1023         }
1024
1025         cd->buflen -= num_entry_words;
1026         cd->buffer = p;
1027         cd->common.err = nfs_ok;
1028         return 0;
1029
1030 }
1031
1032 int
1033 nfs3svc_encode_entry(void *cd, const char *name,
1034                      int namlen, loff_t offset, u64 ino, unsigned int d_type)
1035 {
1036         return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1037 }
1038
1039 int
1040 nfs3svc_encode_entry_plus(void *cd, const char *name,
1041                           int namlen, loff_t offset, u64 ino,
1042                           unsigned int d_type)
1043 {
1044         return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1045 }
1046
1047 /* FSSTAT */
1048 int
1049 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p)
1050 {
1051         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
1052         struct kstatfs  *s = &resp->stats;
1053         u64             bs = s->f_bsize;
1054
1055         *p++ = xdr_zero;        /* no post_op_attr */
1056
1057         if (resp->status == 0) {
1058                 p = xdr_encode_hyper(p, bs * s->f_blocks);      /* total bytes */
1059                 p = xdr_encode_hyper(p, bs * s->f_bfree);       /* free bytes */
1060                 p = xdr_encode_hyper(p, bs * s->f_bavail);      /* user available bytes */
1061                 p = xdr_encode_hyper(p, s->f_files);    /* total inodes */
1062                 p = xdr_encode_hyper(p, s->f_ffree);    /* free inodes */
1063                 p = xdr_encode_hyper(p, s->f_ffree);    /* user available inodes */
1064                 *p++ = htonl(resp->invarsec);   /* mean unchanged time */
1065         }
1066         return xdr_ressize_check(rqstp, p);
1067 }
1068
1069 /* FSINFO */
1070 int
1071 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p)
1072 {
1073         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
1074
1075         *p++ = xdr_zero;        /* no post_op_attr */
1076
1077         if (resp->status == 0) {
1078                 *p++ = htonl(resp->f_rtmax);
1079                 *p++ = htonl(resp->f_rtpref);
1080                 *p++ = htonl(resp->f_rtmult);
1081                 *p++ = htonl(resp->f_wtmax);
1082                 *p++ = htonl(resp->f_wtpref);
1083                 *p++ = htonl(resp->f_wtmult);
1084                 *p++ = htonl(resp->f_dtpref);
1085                 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1086                 *p++ = xdr_one;
1087                 *p++ = xdr_zero;
1088                 *p++ = htonl(resp->f_properties);
1089         }
1090
1091         return xdr_ressize_check(rqstp, p);
1092 }
1093
1094 /* PATHCONF */
1095 int
1096 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p)
1097 {
1098         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
1099
1100         *p++ = xdr_zero;        /* no post_op_attr */
1101
1102         if (resp->status == 0) {
1103                 *p++ = htonl(resp->p_link_max);
1104                 *p++ = htonl(resp->p_name_max);
1105                 *p++ = htonl(resp->p_no_trunc);
1106                 *p++ = htonl(resp->p_chown_restricted);
1107                 *p++ = htonl(resp->p_case_insensitive);
1108                 *p++ = htonl(resp->p_case_preserving);
1109         }
1110
1111         return xdr_ressize_check(rqstp, p);
1112 }
1113
1114 /* COMMIT */
1115 int
1116 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
1117 {
1118         struct nfsd3_commitres *resp = rqstp->rq_resp;
1119         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1120
1121         p = encode_wcc_data(rqstp, p, &resp->fh);
1122         /* Write verifier */
1123         if (resp->status == 0) {
1124                 /* unique identifier, y2038 overflow can be ignored */
1125                 *p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
1126                 *p++ = htonl(nn->nfssvc_boot.tv_nsec);
1127         }
1128         return xdr_ressize_check(rqstp, p);
1129 }
1130
1131 /*
1132  * XDR release functions
1133  */
1134 void
1135 nfs3svc_release_fhandle(struct svc_rqst *rqstp)
1136 {
1137         struct nfsd3_attrstat *resp = rqstp->rq_resp;
1138
1139         fh_put(&resp->fh);
1140 }
1141
1142 void
1143 nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
1144 {
1145         struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;
1146
1147         fh_put(&resp->fh1);
1148         fh_put(&resp->fh2);
1149 }