fs/nfsd/nfs3xdr.c

   1 /*
   2  * linux/fs/nfsd/nfs3xdr.c
   3  *
   4  * XDR support for nfsd/protocol version 3.
   5  *
   6  * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
   7  *
   8  * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/time.h>
  13 #include <linux/nfs3.h>
  14 #include <linux/list.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/dcache.h>
  17 #include <linux/namei.h>
  18 #include <linux/mm.h>
  19 #include <linux/vfs.h>
  20 #include <linux/sunrpc/xdr.h>
  21 #include <linux/sunrpc/svc.h>
  22 #include <linux/nfsd/nfsd.h>
  23 #include <linux/nfsd/xdr3.h>
  24 #include "auth.h"
  25
  26 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  27
  28
  29 /*
  30  * Mapping of S_IF* types to NFS file types
  31  */
  32 static u32      nfs3_ftypes[] = {
  33         NF3NON,  NF3FIFO, NF3CHR, NF3BAD,
  34         NF3DIR,  NF3BAD,  NF3BLK, NF3BAD,
  35         NF3REG,  NF3BAD,  NF3LNK, NF3BAD,
  36         NF3SOCK, NF3BAD,  NF3LNK, NF3BAD,
  37 };
  38
  39 /*
  40  * XDR functions for basic NFS types
  41  */
  42 static __be32 *
  43 encode_time3(__be32 *p, struct timespec *time)
  44 {
  45         *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
  46         return p;
  47 }
  48
  49 static __be32 *
  50 decode_time3(__be32 *p, struct timespec *time)
  51 {
  52         time->tv_sec = ntohl(*p++);
  53         time->tv_nsec = ntohl(*p++);
  54         return p;
  55 }
  56
  57 static __be32 *
  58 decode_fh(__be32 *p, struct svc_fh *fhp)
  59 {
  60         unsigned int size;
  61         fh_init(fhp, NFS3_FHSIZE);
  62         size = ntohl(*p++);
  63         if (size > NFS3_FHSIZE)
  64                 return NULL;
  65
  66         memcpy(&fhp->fh_handle.fh_base, p, size);
  67         fhp->fh_handle.fh_size = size;
  68         return p + XDR_QUADLEN(size);
  69 }
  70
  71 /* Helper function for NFSv3 ACL code */
  72 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
  73 {
  74         return decode_fh(p, fhp);
  75 }
  76
  77 static __be32 *
  78 encode_fh(__be32 *p, struct svc_fh *fhp)
  79 {
  80         unsigned int size = fhp->fh_handle.fh_size;
  81         *p++ = htonl(size);
  82         if (size) p[XDR_QUADLEN(size)-1]=0;
  83         memcpy(p, &fhp->fh_handle.fh_base, size);
  84         return p + XDR_QUADLEN(size);
  85 }
  86
  87 /*
  88  * Decode a file name and make sure that the path contains
  89  * no slashes or null bytes.
  90  */
  91 static __be32 *
  92 decode_filename(__be32 *p, char **namp, unsigned int *lenp)
  93 {
  94         char            *name;
  95         unsigned int    i;
  96
  97         if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
  98                 for (i = 0, name = *namp; i < *lenp; i++, name++) {
  99                         if (*name == '\0' || *name == '/')
 100                                 return NULL;
 101                 }
 102         }
 103
 104         return p;
 105 }
 106
 107 static __be32 *
 108 decode_sattr3(__be32 *p, struct iattr *iap)
 109 {
 110         u32     tmp;
 111
 112         iap->ia_valid = 0;
 113
 114         if (*p++) {
 115                 iap->ia_valid |= ATTR_MODE;
 116                 iap->ia_mode = ntohl(*p++);
 117         }
 118         if (*p++) {
 119                 iap->ia_valid |= ATTR_UID;
 120                 iap->ia_uid = ntohl(*p++);
 121         }
 122         if (*p++) {
 123                 iap->ia_valid |= ATTR_GID;
 124                 iap->ia_gid = ntohl(*p++);
 125         }
 126         if (*p++) {
 127                 u64     newsize;
 128
 129                 iap->ia_valid |= ATTR_SIZE;
 130                 p = xdr_decode_hyper(p, &newsize);
 131                 if (newsize <= NFS_OFFSET_MAX)
 132                         iap->ia_size = newsize;
 133                 else
 134                         iap->ia_size = NFS_OFFSET_MAX;
 135         }
 136         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 137                 iap->ia_valid |= ATTR_ATIME;
 138         } else if (tmp == 2) {          /* set to client time */
 139                 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
 140                 iap->ia_atime.tv_sec = ntohl(*p++);
 141                 iap->ia_atime.tv_nsec = ntohl(*p++);
 142         }
 143         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 144                 iap->ia_valid |= ATTR_MTIME;
 145         } else if (tmp == 2) {          /* set to client time */
 146                 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
 147                 iap->ia_mtime.tv_sec = ntohl(*p++);
 148                 iap->ia_mtime.tv_nsec = ntohl(*p++);
 149         }
 150         return p;
 151 }
 152
 153 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
 154 {
 155         u64 f;
 156         switch(fsid_source(fhp)) {
 157         default:
 158         case FSIDSOURCE_DEV:
 159                 p = xdr_encode_hyper(p, (u64)huge_encode_dev
 160                                      (fhp->fh_dentry->d_inode->i_sb->s_dev));
 161                 break;
 162         case FSIDSOURCE_FSID:
 163                 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
 164                 break;
 165         case FSIDSOURCE_UUID:
 166                 f = ((u64*)fhp->fh_export->ex_uuid)[0];
 167                 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
 168                 p = xdr_encode_hyper(p, f);
 169                 break;
 170         }
 171         return p;
 172 }
 173
 174 static __be32 *
 175 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
 176               struct kstat *stat)
 177 {
 178         *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
 179         *p++ = htonl((u32) stat->mode);
 180         *p++ = htonl((u32) stat->nlink);
 181         *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
 182         *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
 183         if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
 184                 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
 185         } else {
 186                 p = xdr_encode_hyper(p, (u64) stat->size);
 187         }
 188         p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
 189         *p++ = htonl((u32) MAJOR(stat->rdev));
 190         *p++ = htonl((u32) MINOR(stat->rdev));
 191         p = encode_fsid(p, fhp);
 192         p = xdr_encode_hyper(p, stat->ino);
 193         p = encode_time3(p, &stat->atime);
 194         p = encode_time3(p, &stat->mtime);
 195         p = encode_time3(p, &stat->ctime);
 196
 197         return p;
 198 }
 199
 200 static __be32 *
 201 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 202 {
 203         /* Attributes to follow */
 204         *p++ = xdr_one;
 205         return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
 206 }
 207
 208 /*
 209  * Encode post-operation attributes.
 210  * The inode may be NULL if the call failed because of a stale file
 211  * handle. In this case, no attributes are returned.
 212  */
 213 static __be32 *
 214 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 215 {
 216         struct dentry *dentry = fhp->fh_dentry;
 217         if (dentry && dentry->d_inode) {
 218                 int err;
 219                 struct kstat stat;
 220
 221                 err = vfs_getattr(fhp->fh_export->ex_path.mnt, dentry, &stat);
 222                 if (!err) {
 223                         *p++ = xdr_one;         /* attributes follow */
 224                         lease_get_mtime(dentry->d_inode, &stat.mtime);
 225                         return encode_fattr3(rqstp, p, fhp, &stat);
 226                 }
 227         }
 228         *p++ = xdr_zero;
 229         return p;
 230 }
 231
 232 /* Helper for NFSv3 ACLs */
 233 __be32 *
 234 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 235 {
 236         return encode_post_op_attr(rqstp, p, fhp);
 237 }
 238
 239 /*
 240  * Enocde weak cache consistency data
 241  */
 242 static __be32 *
 243 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 244 {
 245         struct dentry   *dentry = fhp->fh_dentry;
 246
 247         if (dentry && dentry->d_inode && fhp->fh_post_saved) {
 248                 if (fhp->fh_pre_saved) {
 249                         *p++ = xdr_one;
 250                         p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
 251                         p = encode_time3(p, &fhp->fh_pre_mtime);
 252                         p = encode_time3(p, &fhp->fh_pre_ctime);
 253                 } else {
 254                         *p++ = xdr_zero;
 255                 }
 256                 return encode_saved_post_attr(rqstp, p, fhp);
 257         }
 258         /* no pre- or post-attrs */
 259         *p++ = xdr_zero;
 260         return encode_post_op_attr(rqstp, p, fhp);
 261 }
 262
 263 /*
 264  * Fill in the post_op attr for the wcc data
 265  */
 266 void fill_post_wcc(struct svc_fh *fhp)
 267 {
 268         int err;
 269
 270         if (fhp->fh_post_saved)
 271                 printk("nfsd: inode locked twice during operation.\n");
 272
 273         err = vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry,
 274                         &fhp->fh_post_attr);
 275         fhp->fh_post_change = fhp->fh_dentry->d_inode->i_version;
 276         if (err) {
 277                 fhp->fh_post_saved = 0;
 278                 /* Grab the ctime anyway - set_change_info might use it */
 279                 fhp->fh_post_attr.ctime = fhp->fh_dentry->d_inode->i_ctime;
 280         } else
 281                 fhp->fh_post_saved = 1;
 282 }
 283
 284 /*
 285  * XDR decode functions
 286  */
 287 int
 288 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
 289 {
 290         if (!(p = decode_fh(p, &args->fh)))
 291                 return 0;
 292         return xdr_argsize_check(rqstp, p);
 293 }
 294
 295 int
 296 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
 297                                         struct nfsd3_sattrargs *args)
 298 {
 299         if (!(p = decode_fh(p, &args->fh)))
 300                 return 0;
 301         p = decode_sattr3(p, &args->attrs);
 302
 303         if ((args->check_guard = ntohl(*p++)) != 0) {
 304                 struct timespec time;
 305                 p = decode_time3(p, &time);
 306                 args->guardtime = time.tv_sec;
 307         }
 308
 309         return xdr_argsize_check(rqstp, p);
 310 }
 311
 312 int
 313 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
 314                                         struct nfsd3_diropargs *args)
 315 {
 316         if (!(p = decode_fh(p, &args->fh))
 317          || !(p = decode_filename(p, &args->name, &args->len)))
 318                 return 0;
 319
 320         return xdr_argsize_check(rqstp, p);
 321 }
 322
 323 int
 324 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
 325                                         struct nfsd3_accessargs *args)
 326 {
 327         if (!(p = decode_fh(p, &args->fh)))
 328                 return 0;
 329         args->access = ntohl(*p++);
 330
 331         return xdr_argsize_check(rqstp, p);
 332 }
 333
 334 int
 335 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
 336                                         struct nfsd3_readargs *args)
 337 {
 338         unsigned int len;
 339         int v,pn;
 340         u32 max_blocksize = svc_max_payload(rqstp);
 341
 342         if (!(p = decode_fh(p, &args->fh)))
 343                 return 0;
 344         p = xdr_decode_hyper(p, &args->offset);
 345
 346         len = args->count = ntohl(*p++);
 347
 348         if (len > max_blocksize)
 349                 len = max_blocksize;
 350
 351         /* set up the kvec */
 352         v=0;
 353         while (len > 0) {
 354                 pn = rqstp->rq_resused++;
 355                 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
 356                 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
 357                 len -= rqstp->rq_vec[v].iov_len;
 358                 v++;
 359         }
 360         args->vlen = v;
 361         return xdr_argsize_check(rqstp, p);
 362 }
 363
 364 int
 365 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
 366                                         struct nfsd3_writeargs *args)
 367 {
 368         unsigned int len, v, hdr, dlen;
 369         u32 max_blocksize = svc_max_payload(rqstp);
 370
 371         if (!(p = decode_fh(p, &args->fh)))
 372                 return 0;
 373         p = xdr_decode_hyper(p, &args->offset);
 374
 375         args->count = ntohl(*p++);
 376         args->stable = ntohl(*p++);
 377         len = args->len = ntohl(*p++);
 378         /*
 379          * The count must equal the amount of data passed.
 380          */
 381         if (args->count != args->len)
 382                 return 0;
 383
 384         /*
 385          * Check to make sure that we got the right number of
 386          * bytes.
 387          */
 388         hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
 389         dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
 390                 - hdr;
 391         /*
 392          * Round the length of the data which was specified up to
 393          * the next multiple of XDR units and then compare that
 394          * against the length which was actually received.
 395          * Note that when RPCSEC/GSS (for example) is used, the
 396          * data buffer can be padded so dlen might be larger
 397          * than required.  It must never be smaller.
 398          */
 399         if (dlen < XDR_QUADLEN(len)*4)
 400                 return 0;
 401
 402         if (args->count > max_blocksize) {
 403                 args->count = max_blocksize;
 404                 len = args->len = max_blocksize;
 405         }
 406         rqstp->rq_vec[0].iov_base = (void*)p;
 407         rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
 408         v = 0;
 409         while (len > rqstp->rq_vec[v].iov_len) {
 410                 len -= rqstp->rq_vec[v].iov_len;
 411                 v++;
 412                 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
 413                 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 414         }
 415         rqstp->rq_vec[v].iov_len = len;
 416         args->vlen = v + 1;
 417         return 1;
 418 }
 419
 420 int
 421 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
 422                                         struct nfsd3_createargs *args)
 423 {
 424         if (!(p = decode_fh(p, &args->fh))
 425          || !(p = decode_filename(p, &args->name, &args->len)))
 426                 return 0;
 427
 428         switch (args->createmode = ntohl(*p++)) {
 429         case NFS3_CREATE_UNCHECKED:
 430         case NFS3_CREATE_GUARDED:
 431                 p = decode_sattr3(p, &args->attrs);
 432                 break;
 433         case NFS3_CREATE_EXCLUSIVE:
 434                 args->verf = p;
 435                 p += 2;
 436                 break;
 437         default:
 438                 return 0;
 439         }
 440
 441         return xdr_argsize_check(rqstp, p);
 442 }
 443 int
 444 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
 445                                         struct nfsd3_createargs *args)
 446 {
 447         if (!(p = decode_fh(p, &args->fh)) ||
 448             !(p = decode_filename(p, &args->name, &args->len)))
 449                 return 0;
 450         p = decode_sattr3(p, &args->attrs);
 451
 452         return xdr_argsize_check(rqstp, p);
 453 }
 454
 455 int
 456 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
 457                                         struct nfsd3_symlinkargs *args)
 458 {
 459         unsigned int len, avail;
 460         char *old, *new;
 461         struct kvec *vec;
 462
 463         if (!(p = decode_fh(p, &args->ffh)) ||
 464             !(p = decode_filename(p, &args->fname, &args->flen))
 465                 )
 466                 return 0;
 467         p = decode_sattr3(p, &args->attrs);
 468
 469         /* now decode the pathname, which might be larger than the first page.
 470          * As we have to check for nul's anyway, we copy it into a new page
 471          * This page appears in the rq_res.pages list, but as pages_len is always
 472          * 0, it won't get in the way
 473          */
 474         len = ntohl(*p++);
 475         if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
 476                 return 0;
 477         args->tname = new =
 478                 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
 479         args->tlen = len;
 480         /* first copy and check from the first page */
 481         old = (char*)p;
 482         vec = &rqstp->rq_arg.head[0];
 483         avail = vec->iov_len - (old - (char*)vec->iov_base);
 484         while (len && avail && *old) {
 485                 *new++ = *old++;
 486                 len--;
 487                 avail--;
 488         }
 489         /* now copy next page if there is one */
 490         if (len && !avail && rqstp->rq_arg.page_len) {
 491                 avail = rqstp->rq_arg.page_len;
 492                 if (avail > PAGE_SIZE)
 493                         avail = PAGE_SIZE;
 494                 old = page_address(rqstp->rq_arg.pages[0]);
 495         }
 496         while (len && avail && *old) {
 497                 *new++ = *old++;
 498                 len--;
 499                 avail--;
 500         }
 501         *new = '\0';
 502         if (len)
 503                 return 0;
 504
 505         return 1;
 506 }
 507
 508 int
 509 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
 510                                         struct nfsd3_mknodargs *args)
 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);
 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                                         struct nfsd3_renameargs *args)
 533 {
 534         if (!(p = decode_fh(p, &args->ffh))
 535          || !(p = decode_filename(p, &args->fname, &args->flen))
 536          || !(p = decode_fh(p, &args->tfh))
 537          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 538                 return 0;
 539
 540         return xdr_argsize_check(rqstp, p);
 541 }
 542
 543 int
 544 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
 545                                         struct nfsd3_readlinkargs *args)
 546 {
 547         if (!(p = decode_fh(p, &args->fh)))
 548                 return 0;
 549         args->buffer =
 550                 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
 551
 552         return xdr_argsize_check(rqstp, p);
 553 }
 554
 555 int
 556 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
 557                                         struct nfsd3_linkargs *args)
 558 {
 559         if (!(p = decode_fh(p, &args->ffh))
 560          || !(p = decode_fh(p, &args->tfh))
 561          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 562                 return 0;
 563
 564         return xdr_argsize_check(rqstp, p);
 565 }
 566
 567 int
 568 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
 569                                         struct nfsd3_readdirargs *args)
 570 {
 571         if (!(p = decode_fh(p, &args->fh)))
 572                 return 0;
 573         p = xdr_decode_hyper(p, &args->cookie);
 574         args->verf   = p; p += 2;
 575         args->dircount = ~0;
 576         args->count  = ntohl(*p++);
 577
 578         if (args->count > PAGE_SIZE)
 579                 args->count = PAGE_SIZE;
 580
 581         args->buffer =
 582                 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
 583
 584         return xdr_argsize_check(rqstp, p);
 585 }
 586
 587 int
 588 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
 589                                         struct nfsd3_readdirargs *args)
 590 {
 591         int len, pn;
 592         u32 max_blocksize = svc_max_payload(rqstp);
 593
 594         if (!(p = decode_fh(p, &args->fh)))
 595                 return 0;
 596         p = xdr_decode_hyper(p, &args->cookie);
 597         args->verf     = p; p += 2;
 598         args->dircount = ntohl(*p++);
 599         args->count    = ntohl(*p++);
 600
 601         len = (args->count > max_blocksize) ? max_blocksize :
 602                                                   args->count;
 603         args->count = len;
 604
 605         while (len > 0) {
 606                 pn = rqstp->rq_resused++;
 607                 if (!args->buffer)
 608                         args->buffer = page_address(rqstp->rq_respages[pn]);
 609                 len -= PAGE_SIZE;
 610         }
 611
 612         return xdr_argsize_check(rqstp, p);
 613 }
 614
 615 int
 616 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
 617                                         struct nfsd3_commitargs *args)
 618 {
 619         if (!(p = decode_fh(p, &args->fh)))
 620                 return 0;
 621         p = xdr_decode_hyper(p, &args->offset);
 622         args->count = ntohl(*p++);
 623
 624         return xdr_argsize_check(rqstp, p);
 625 }
 626
 627 /*
 628  * XDR encode functions
 629  */
 630 /*
 631  * There must be an encoding function for void results so svc_process
 632  * will work properly.
 633  */
 634 int
 635 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 636 {
 637         return xdr_ressize_check(rqstp, p);
 638 }
 639
 640 /* GETATTR */
 641 int
 642 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
 643                                         struct nfsd3_attrstat *resp)
 644 {
 645         if (resp->status == 0) {
 646                 lease_get_mtime(resp->fh.fh_dentry->d_inode,
 647                                 &resp->stat.mtime);
 648                 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
 649         }
 650         return xdr_ressize_check(rqstp, p);
 651 }
 652
 653 /* SETATTR, REMOVE, RMDIR */
 654 int
 655 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
 656                                         struct nfsd3_attrstat *resp)
 657 {
 658         p = encode_wcc_data(rqstp, p, &resp->fh);
 659         return xdr_ressize_check(rqstp, p);
 660 }
 661
 662 /* LOOKUP */
 663 int
 664 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
 665                                         struct nfsd3_diropres *resp)
 666 {
 667         if (resp->status == 0) {
 668                 p = encode_fh(p, &resp->fh);
 669                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 670         }
 671         p = encode_post_op_attr(rqstp, p, &resp->dirfh);
 672         return xdr_ressize_check(rqstp, p);
 673 }
 674
 675 /* ACCESS */
 676 int
 677 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
 678                                         struct nfsd3_accessres *resp)
 679 {
 680         p = encode_post_op_attr(rqstp, p, &resp->fh);
 681         if (resp->status == 0)
 682                 *p++ = htonl(resp->access);
 683         return xdr_ressize_check(rqstp, p);
 684 }
 685
 686 /* READLINK */
 687 int
 688 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
 689                                         struct nfsd3_readlinkres *resp)
 690 {
 691         p = encode_post_op_attr(rqstp, p, &resp->fh);
 692         if (resp->status == 0) {
 693                 *p++ = htonl(resp->len);
 694                 xdr_ressize_check(rqstp, p);
 695                 rqstp->rq_res.page_len = resp->len;
 696                 if (resp->len & 3) {
 697                         /* need to pad the tail */
 698                         rqstp->rq_res.tail[0].iov_base = p;
 699                         *p = 0;
 700                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
 701                 }
 702                 return 1;
 703         } else
 704                 return xdr_ressize_check(rqstp, p);
 705 }
 706
 707 /* READ */
 708 int
 709 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
 710                                         struct nfsd3_readres *resp)
 711 {
 712         p = encode_post_op_attr(rqstp, p, &resp->fh);
 713         if (resp->status == 0) {
 714                 *p++ = htonl(resp->count);
 715                 *p++ = htonl(resp->eof);
 716                 *p++ = htonl(resp->count);      /* xdr opaque count */
 717                 xdr_ressize_check(rqstp, p);
 718                 /* now update rqstp->rq_res to reflect data aswell */
 719                 rqstp->rq_res.page_len = resp->count;
 720                 if (resp->count & 3) {
 721                         /* need to pad the tail */
 722                         rqstp->rq_res.tail[0].iov_base = p;
 723                         *p = 0;
 724                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
 725                 }
 726                 return 1;
 727         } else
 728                 return xdr_ressize_check(rqstp, p);
 729 }
 730
 731 /* WRITE */
 732 int
 733 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
 734                                         struct nfsd3_writeres *resp)
 735 {
 736         p = encode_wcc_data(rqstp, p, &resp->fh);
 737         if (resp->status == 0) {
 738                 *p++ = htonl(resp->count);
 739                 *p++ = htonl(resp->committed);
 740                 *p++ = htonl(nfssvc_boot.tv_sec);
 741                 *p++ = htonl(nfssvc_boot.tv_usec);
 742         }
 743         return xdr_ressize_check(rqstp, p);
 744 }
 745
 746 /* CREATE, MKDIR, SYMLINK, MKNOD */
 747 int
 748 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
 749                                         struct nfsd3_diropres *resp)
 750 {
 751         if (resp->status == 0) {
 752                 *p++ = xdr_one;
 753                 p = encode_fh(p, &resp->fh);
 754                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 755         }
 756         p = encode_wcc_data(rqstp, p, &resp->dirfh);
 757         return xdr_ressize_check(rqstp, p);
 758 }
 759
 760 /* RENAME */
 761 int
 762 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
 763                                         struct nfsd3_renameres *resp)
 764 {
 765         p = encode_wcc_data(rqstp, p, &resp->ffh);
 766         p = encode_wcc_data(rqstp, p, &resp->tfh);
 767         return xdr_ressize_check(rqstp, p);
 768 }
 769
 770 /* LINK */
 771 int
 772 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
 773                                         struct nfsd3_linkres *resp)
 774 {
 775         p = encode_post_op_attr(rqstp, p, &resp->fh);
 776         p = encode_wcc_data(rqstp, p, &resp->tfh);
 777         return xdr_ressize_check(rqstp, p);
 778 }
 779
 780 /* READDIR */
 781 int
 782 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
 783                                         struct nfsd3_readdirres *resp)
 784 {
 785         p = encode_post_op_attr(rqstp, p, &resp->fh);
 786
 787         if (resp->status == 0) {
 788                 /* stupid readdir cookie */
 789                 memcpy(p, resp->verf, 8); p += 2;
 790                 xdr_ressize_check(rqstp, p);
 791                 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
 792                         return 1; /*No room for trailer */
 793                 rqstp->rq_res.page_len = (resp->count) << 2;
 794
 795                 /* add the 'tail' to the end of the 'head' page - page 0. */
 796                 rqstp->rq_res.tail[0].iov_base = p;
 797                 *p++ = 0;               /* no more entries */
 798                 *p++ = htonl(resp->common.err == nfserr_eof);
 799                 rqstp->rq_res.tail[0].iov_len = 2<<2;
 800                 return 1;
 801         } else
 802                 return xdr_ressize_check(rqstp, p);
 803 }
 804
 805 static __be32 *
 806 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
 807              int namlen, u64 ino)
 808 {
 809         *p++ = xdr_one;                          /* mark entry present */
 810         p    = xdr_encode_hyper(p, ino);         /* file id */
 811         p    = xdr_encode_array(p, name, namlen);/* name length & name */
 812
 813         cd->offset = p;                         /* remember pointer */
 814         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
 815
 816         return p;
 817 }
 818
 819 static int
 820 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
 821                 const char *name, int namlen)
 822 {
 823         struct svc_export       *exp;
 824         struct dentry           *dparent, *dchild;
 825         int rv = 0;
 826
 827         dparent = cd->fh.fh_dentry;
 828         exp  = cd->fh.fh_export;
 829
 830         if (isdotent(name, namlen)) {
 831                 if (namlen == 2) {
 832                         dchild = dget_parent(dparent);
 833                         if (dchild == dparent) {
 834                                 /* filesystem root - cannot return filehandle for ".." */
 835                                 dput(dchild);
 836                                 return -ENOENT;
 837                         }
 838                 } else
 839                         dchild = dget(dparent);
 840         } else
 841                 dchild = lookup_one_len(name, dparent, namlen);
 842         if (IS_ERR(dchild))
 843                 return -ENOENT;
 844         rv = -ENOENT;
 845         if (d_mountpoint(dchild))
 846                 goto out;
 847         rv = fh_compose(fhp, exp, dchild, &cd->fh);
 848         if (rv)
 849                 goto out;
 850         if (!dchild->d_inode)
 851                 goto out;
 852         rv = 0;
 853 out:
 854         dput(dchild);
 855         return rv;
 856 }
 857
 858 __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen)
 859 {
 860         struct svc_fh   fh;
 861         int err;
 862
 863         fh_init(&fh, NFS3_FHSIZE);
 864         err = compose_entry_fh(cd, &fh, name, namlen);
 865         if (err) {
 866                 *p++ = 0;
 867                 *p++ = 0;
 868                 goto out;
 869         }
 870         p = encode_post_op_attr(cd->rqstp, p, &fh);
 871         *p++ = xdr_one;                 /* yes, a file handle follows */
 872         p = encode_fh(p, &fh);
 873 out:
 874         fh_put(&fh);
 875         return p;
 876 }
 877
 878 /*
 879  * Encode a directory entry. This one works for both normal readdir
 880  * and readdirplus.
 881  * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
 882  * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
 883  *
 884  * The readdirplus baggage is 1+21 words for post_op_attr, plus the
 885  * file handle.
 886  */
 887
 888 #define NFS3_ENTRY_BAGGAGE      (2 + 1 + 2 + 1)
 889 #define NFS3_ENTRYPLUS_BAGGAGE  (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
 890 static int
 891 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
 892              loff_t offset, u64 ino, unsigned int d_type, int plus)
 893 {
 894         struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
 895                                                         common);
 896         __be32          *p = cd->buffer;
 897         caddr_t         curr_page_addr = NULL;
 898         int             pn;             /* current page number */
 899         int             slen;           /* string (name) length */
 900         int             elen;           /* estimated entry length in words */
 901         int             num_entry_words = 0;    /* actual number of words */
 902
 903         if (cd->offset) {
 904                 u64 offset64 = offset;
 905
 906                 if (unlikely(cd->offset1)) {
 907                         /* we ended up with offset on a page boundary */
 908                         *cd->offset = htonl(offset64 >> 32);
 909                         *cd->offset1 = htonl(offset64 & 0xffffffff);
 910                         cd->offset1 = NULL;
 911                 } else {
 912                         xdr_encode_hyper(cd->offset, offset64);
 913                 }
 914         }
 915
 916         /*
 917         dprintk("encode_entry(%.*s @%ld%s)\n",
 918                 namlen, name, (long) offset, plus? " plus" : "");
 919          */
 920
 921         /* truncate filename if too long */
 922         if (namlen > NFS3_MAXNAMLEN)
 923                 namlen = NFS3_MAXNAMLEN;
 924
 925         slen = XDR_QUADLEN(namlen);
 926         elen = slen + NFS3_ENTRY_BAGGAGE
 927                 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
 928
 929         if (cd->buflen < elen) {
 930                 cd->common.err = nfserr_toosmall;
 931                 return -EINVAL;
 932         }
 933
 934         /* determine which page in rq_respages[] we are currently filling */
 935         for (pn=1; pn < cd->rqstp->rq_resused; pn++) {
 936                 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
 937
 938                 if (((caddr_t)cd->buffer >= curr_page_addr) &&
 939                     ((caddr_t)cd->buffer <  curr_page_addr + PAGE_SIZE))
 940                         break;
 941         }
 942
 943         if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
 944                 /* encode entry in current page */
 945
 946                 p = encode_entry_baggage(cd, p, name, namlen, ino);
 947
 948                 if (plus)
 949                         p = encode_entryplus_baggage(cd, p, name, namlen);
 950                 num_entry_words = p - cd->buffer;
 951         } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
 952                 /* temporarily encode entry into next page, then move back to
 953                  * current and next page in rq_respages[] */
 954                 __be32 *p1, *tmp;
 955                 int len1, len2;
 956
 957                 /* grab next page for temporary storage of entry */
 958                 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
 959
 960                 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
 961
 962                 if (plus)
 963                         p1 = encode_entryplus_baggage(cd, p1, name, namlen);
 964
 965                 /* determine entry word length and lengths to go in pages */
 966                 num_entry_words = p1 - tmp;
 967                 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
 968                 if ((num_entry_words << 2) < len1) {
 969                         /* the actual number of words in the entry is less
 970                          * than elen and can still fit in the current page
 971                          */
 972                         memmove(p, tmp, num_entry_words << 2);
 973                         p += num_entry_words;
 974
 975                         /* update offset */
 976                         cd->offset = cd->buffer + (cd->offset - tmp);
 977                 } else {
 978                         unsigned int offset_r = (cd->offset - tmp) << 2;
 979
 980                         /* update pointer to offset location.
 981                          * This is a 64bit quantity, so we need to
 982                          * deal with 3 cases:
 983                          *  -   entirely in first page
 984                          *  -   entirely in second page
 985                          *  -   4 bytes in each page
 986                          */
 987                         if (offset_r + 8 <= len1) {
 988                                 cd->offset = p + (cd->offset - tmp);
 989                         } else if (offset_r >= len1) {
 990                                 cd->offset -= len1 >> 2;
 991                         } else {
 992                                 /* sitting on the fence */
 993                                 BUG_ON(offset_r != len1 - 4);
 994                                 cd->offset = p + (cd->offset - tmp);
 995                                 cd->offset1 = tmp;
 996                         }
 997
 998                         len2 = (num_entry_words << 2) - len1;
 999
1000                         /* move from temp page to current and next pages */
1001                         memmove(p, tmp, len1);
1002                         memmove(tmp, (caddr_t)tmp+len1, len2);
1003
1004                         p = tmp + (len2 >> 2);
1005                 }
1006         }
1007         else {
1008                 cd->common.err = nfserr_toosmall;
1009                 return -EINVAL;
1010         }
1011
1012         cd->buflen -= num_entry_words;
1013         cd->buffer = p;
1014         cd->common.err = nfs_ok;
1015         return 0;
1016
1017 }
1018
1019 int
1020 nfs3svc_encode_entry(void *cd, const char *name,
1021                      int namlen, loff_t offset, u64 ino, unsigned int d_type)
1022 {
1023         return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1024 }
1025
1026 int
1027 nfs3svc_encode_entry_plus(void *cd, const char *name,
1028                           int namlen, loff_t offset, u64 ino,
1029                           unsigned int d_type)
1030 {
1031         return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1032 }
1033
1034 /* FSSTAT */
1035 int
1036 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1037                                         struct nfsd3_fsstatres *resp)
1038 {
1039         struct kstatfs  *s = &resp->stats;
1040         u64             bs = s->f_bsize;
1041
1042         *p++ = xdr_zero;        /* no post_op_attr */
1043
1044         if (resp->status == 0) {
1045                 p = xdr_encode_hyper(p, bs * s->f_blocks);      /* total bytes */
1046                 p = xdr_encode_hyper(p, bs * s->f_bfree);       /* free bytes */
1047                 p = xdr_encode_hyper(p, bs * s->f_bavail);      /* user available bytes */
1048                 p = xdr_encode_hyper(p, s->f_files);    /* total inodes */
1049                 p = xdr_encode_hyper(p, s->f_ffree);    /* free inodes */
1050                 p = xdr_encode_hyper(p, s->f_ffree);    /* user available inodes */
1051                 *p++ = htonl(resp->invarsec);   /* mean unchanged time */
1052         }
1053         return xdr_ressize_check(rqstp, p);
1054 }
1055
1056 /* FSINFO */
1057 int
1058 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1059                                         struct nfsd3_fsinfores *resp)
1060 {
1061         *p++ = xdr_zero;        /* no post_op_attr */
1062
1063         if (resp->status == 0) {
1064                 *p++ = htonl(resp->f_rtmax);
1065                 *p++ = htonl(resp->f_rtpref);
1066                 *p++ = htonl(resp->f_rtmult);
1067                 *p++ = htonl(resp->f_wtmax);
1068                 *p++ = htonl(resp->f_wtpref);
1069                 *p++ = htonl(resp->f_wtmult);
1070                 *p++ = htonl(resp->f_dtpref);
1071                 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1072                 *p++ = xdr_one;
1073                 *p++ = xdr_zero;
1074                 *p++ = htonl(resp->f_properties);
1075         }
1076
1077         return xdr_ressize_check(rqstp, p);
1078 }
1079
1080 /* PATHCONF */
1081 int
1082 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1083                                         struct nfsd3_pathconfres *resp)
1084 {
1085         *p++ = xdr_zero;        /* no post_op_attr */
1086
1087         if (resp->status == 0) {
1088                 *p++ = htonl(resp->p_link_max);
1089                 *p++ = htonl(resp->p_name_max);
1090                 *p++ = htonl(resp->p_no_trunc);
1091                 *p++ = htonl(resp->p_chown_restricted);
1092                 *p++ = htonl(resp->p_case_insensitive);
1093                 *p++ = htonl(resp->p_case_preserving);
1094         }
1095
1096         return xdr_ressize_check(rqstp, p);
1097 }
1098
1099 /* COMMIT */
1100 int
1101 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1102                                         struct nfsd3_commitres *resp)
1103 {
1104         p = encode_wcc_data(rqstp, p, &resp->fh);
1105         /* Write verifier */
1106         if (resp->status == 0) {
1107                 *p++ = htonl(nfssvc_boot.tv_sec);
1108                 *p++ = htonl(nfssvc_boot.tv_usec);
1109         }
1110         return xdr_ressize_check(rqstp, p);
1111 }
1112
1113 /*
1114  * XDR release functions
1115  */
1116 int
1117 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1118                                         struct nfsd3_attrstat *resp)
1119 {
1120         fh_put(&resp->fh);
1121         return 1;
1122 }
1123
1124 int
1125 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
1126                                         struct nfsd3_fhandle_pair *resp)
1127 {
1128         fh_put(&resp->fh1);
1129         fh_put(&resp->fh2);
1130         return 1;
1131 }