fs/nfsd/nfs3xdr.c

   1 /*
   2  * XDR support for nfsd/protocol version 3.
   3  *
   4  * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
   5  *
   6  * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
   7  */
   8
   9 #include <linux/namei.h>
  10 #include <linux/sunrpc/svc_xprt.h>
  11 #include "xdr3.h"
  12 #include "auth.h"
  13 #include "netns.h"
  14 #include "vfs.h"
  15
  16 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  17
  18
  19 /*
  20  * Mapping of S_IF* types to NFS file types
  21  */
  22 static u32      nfs3_ftypes[] = {
  23         NF3NON,  NF3FIFO, NF3CHR, NF3BAD,
  24         NF3DIR,  NF3BAD,  NF3BLK, NF3BAD,
  25         NF3REG,  NF3BAD,  NF3LNK, NF3BAD,
  26         NF3SOCK, NF3BAD,  NF3LNK, NF3BAD,
  27 };
  28
  29 /*
  30  * XDR functions for basic NFS types
  31  */
  32 static __be32 *
  33 encode_time3(__be32 *p, struct timespec *time)
  34 {
  35         *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
  36         return p;
  37 }
  38
  39 static __be32 *
  40 decode_time3(__be32 *p, struct timespec *time)
  41 {
  42         time->tv_sec = ntohl(*p++);
  43         time->tv_nsec = ntohl(*p++);
  44         return p;
  45 }
  46
  47 static __be32 *
  48 decode_fh(__be32 *p, struct svc_fh *fhp)
  49 {
  50         unsigned int size;
  51         fh_init(fhp, NFS3_FHSIZE);
  52         size = ntohl(*p++);
  53         if (size > NFS3_FHSIZE)
  54                 return NULL;
  55
  56         memcpy(&fhp->fh_handle.fh_base, p, size);
  57         fhp->fh_handle.fh_size = size;
  58         return p + XDR_QUADLEN(size);
  59 }
  60
  61 /* Helper function for NFSv3 ACL code */
  62 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
  63 {
  64         return decode_fh(p, fhp);
  65 }
  66
  67 static __be32 *
  68 encode_fh(__be32 *p, struct svc_fh *fhp)
  69 {
  70         unsigned int size = fhp->fh_handle.fh_size;
  71         *p++ = htonl(size);
  72         if (size) p[XDR_QUADLEN(size)-1]=0;
  73         memcpy(p, &fhp->fh_handle.fh_base, size);
  74         return p + XDR_QUADLEN(size);
  75 }
  76
  77 /*
  78  * Decode a file name and make sure that the path contains
  79  * no slashes or null bytes.
  80  */
  81 static __be32 *
  82 decode_filename(__be32 *p, char **namp, unsigned int *lenp)
  83 {
  84         char            *name;
  85         unsigned int    i;
  86
  87         if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
  88                 for (i = 0, name = *namp; i < *lenp; i++, name++) {
  89                         if (*name == '\0' || *name == '/')
  90                                 return NULL;
  91                 }
  92         }
  93
  94         return p;
  95 }
  96
  97 static __be32 *
  98 decode_sattr3(__be32 *p, struct iattr *iap)
  99 {
 100         u32     tmp;
 101
 102         iap->ia_valid = 0;
 103
 104         if (*p++) {
 105                 iap->ia_valid |= ATTR_MODE;
 106                 iap->ia_mode = ntohl(*p++);
 107         }
 108         if (*p++) {
 109                 iap->ia_uid = make_kuid(&init_user_ns, ntohl(*p++));
 110                 if (uid_valid(iap->ia_uid))
 111                         iap->ia_valid |= ATTR_UID;
 112         }
 113         if (*p++) {
 114                 iap->ia_gid = make_kgid(&init_user_ns, ntohl(*p++));
 115                 if (gid_valid(iap->ia_gid))
 116                         iap->ia_valid |= ATTR_GID;
 117         }
 118         if (*p++) {
 119                 u64     newsize;
 120
 121                 iap->ia_valid |= ATTR_SIZE;
 122                 p = xdr_decode_hyper(p, &newsize);
 123                 iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
 124         }
 125         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 126                 iap->ia_valid |= ATTR_ATIME;
 127         } else if (tmp == 2) {          /* set to client time */
 128                 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
 129                 iap->ia_atime.tv_sec = ntohl(*p++);
 130                 iap->ia_atime.tv_nsec = ntohl(*p++);
 131         }
 132         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 133                 iap->ia_valid |= ATTR_MTIME;
 134         } else if (tmp == 2) {          /* set to client time */
 135                 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
 136                 iap->ia_mtime.tv_sec = ntohl(*p++);
 137                 iap->ia_mtime.tv_nsec = ntohl(*p++);
 138         }
 139         return p;
 140 }
 141
 142 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
 143 {
 144         u64 f;
 145         switch(fsid_source(fhp)) {
 146         default:
 147         case FSIDSOURCE_DEV:
 148                 p = xdr_encode_hyper(p, (u64)huge_encode_dev
 149                                      (fhp->fh_dentry->d_sb->s_dev));
 150                 break;
 151         case FSIDSOURCE_FSID:
 152                 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
 153                 break;
 154         case FSIDSOURCE_UUID:
 155                 f = ((u64*)fhp->fh_export->ex_uuid)[0];
 156                 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
 157                 p = xdr_encode_hyper(p, f);
 158                 break;
 159         }
 160         return p;
 161 }
 162
 163 static __be32 *
 164 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
 165               struct kstat *stat)
 166 {
 167         *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
 168         *p++ = htonl((u32) (stat->mode & S_IALLUGO));
 169         *p++ = htonl((u32) stat->nlink);
 170         *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
 171         *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
 172         if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
 173                 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
 174         } else {
 175                 p = xdr_encode_hyper(p, (u64) stat->size);
 176         }
 177         p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
 178         *p++ = htonl((u32) MAJOR(stat->rdev));
 179         *p++ = htonl((u32) MINOR(stat->rdev));
 180         p = encode_fsid(p, fhp);
 181         p = xdr_encode_hyper(p, stat->ino);
 182         p = encode_time3(p, &stat->atime);
 183         p = encode_time3(p, &stat->mtime);
 184         p = encode_time3(p, &stat->ctime);
 185
 186         return p;
 187 }
 188
 189 static __be32 *
 190 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 191 {
 192         /* Attributes to follow */
 193         *p++ = xdr_one;
 194         return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
 195 }
 196
 197 /*
 198  * Encode post-operation attributes.
 199  * The inode may be NULL if the call failed because of a stale file
 200  * handle. In this case, no attributes are returned.
 201  */
 202 static __be32 *
 203 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 204 {
 205         struct dentry *dentry = fhp->fh_dentry;
 206         if (dentry && d_really_is_positive(dentry)) {
 207                 __be32 err;
 208                 struct kstat stat;
 209
 210                 err = fh_getattr(fhp, &stat);
 211                 if (!err) {
 212                         *p++ = xdr_one;         /* attributes follow */
 213                         lease_get_mtime(d_inode(dentry), &stat.mtime);
 214                         return encode_fattr3(rqstp, p, fhp, &stat);
 215                 }
 216         }
 217         *p++ = xdr_zero;
 218         return p;
 219 }
 220
 221 /* Helper for NFSv3 ACLs */
 222 __be32 *
 223 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 224 {
 225         return encode_post_op_attr(rqstp, p, fhp);
 226 }
 227
 228 /*
 229  * Enocde weak cache consistency data
 230  */
 231 static __be32 *
 232 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 233 {
 234         struct dentry   *dentry = fhp->fh_dentry;
 235
 236         if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
 237                 if (fhp->fh_pre_saved) {
 238                         *p++ = xdr_one;
 239                         p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
 240                         p = encode_time3(p, &fhp->fh_pre_mtime);
 241                         p = encode_time3(p, &fhp->fh_pre_ctime);
 242                 } else {
 243                         *p++ = xdr_zero;
 244                 }
 245                 return encode_saved_post_attr(rqstp, p, fhp);
 246         }
 247         /* no pre- or post-attrs */
 248         *p++ = xdr_zero;
 249         return encode_post_op_attr(rqstp, p, fhp);
 250 }
 251
 252 /*
 253  * Fill in the post_op attr for the wcc data
 254  */
 255 void fill_post_wcc(struct svc_fh *fhp)
 256 {
 257         __be32 err;
 258
 259         if (fhp->fh_post_saved)
 260                 printk("nfsd: inode locked twice during operation.\n");
 261
 262         err = fh_getattr(fhp, &fhp->fh_post_attr);
 263         fhp->fh_post_change = nfsd4_change_attribute(d_inode(fhp->fh_dentry));
 264         if (err) {
 265                 fhp->fh_post_saved = false;
 266                 /* Grab the ctime anyway - set_change_info might use it */
 267                 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
 268         } else
 269                 fhp->fh_post_saved = true;
 270 }
 271
 272 /*
 273  * XDR decode functions
 274  */
 275 int
 276 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
 277 {
 278         struct nfsd_fhandle *args = rqstp->rq_argp;
 279
 280         p = decode_fh(p, &args->fh);
 281         if (!p)
 282                 return 0;
 283         return xdr_argsize_check(rqstp, p);
 284 }
 285
 286 int
 287 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
 288 {
 289         struct nfsd3_sattrargs *args = rqstp->rq_argp;
 290
 291         p = decode_fh(p, &args->fh);
 292         if (!p)
 293                 return 0;
 294         p = decode_sattr3(p, &args->attrs);
 295
 296         if ((args->check_guard = ntohl(*p++)) != 0) {
 297                 struct timespec time;
 298                 p = decode_time3(p, &time);
 299                 args->guardtime = time.tv_sec;
 300         }
 301
 302         return xdr_argsize_check(rqstp, p);
 303 }
 304
 305 int
 306 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
 307 {
 308         struct nfsd3_diropargs *args = rqstp->rq_argp;
 309
 310         if (!(p = decode_fh(p, &args->fh))
 311          || !(p = decode_filename(p, &args->name, &args->len)))
 312                 return 0;
 313
 314         return xdr_argsize_check(rqstp, p);
 315 }
 316
 317 int
 318 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
 319 {
 320         struct nfsd3_accessargs *args = rqstp->rq_argp;
 321
 322         p = decode_fh(p, &args->fh);
 323         if (!p)
 324                 return 0;
 325         args->access = ntohl(*p++);
 326
 327         return xdr_argsize_check(rqstp, p);
 328 }
 329
 330 int
 331 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
 332 {
 333         struct nfsd3_readargs *args = rqstp->rq_argp;
 334         unsigned int len;
 335         int v;
 336         u32 max_blocksize = svc_max_payload(rqstp);
 337
 338         p = decode_fh(p, &args->fh);
 339         if (!p)
 340                 return 0;
 341         p = xdr_decode_hyper(p, &args->offset);
 342
 343         args->count = ntohl(*p++);
 344         len = min(args->count, max_blocksize);
 345
 346         /* set up the kvec */
 347         v=0;
 348         while (len > 0) {
 349                 struct page *p = *(rqstp->rq_next_page++);
 350
 351                 rqstp->rq_vec[v].iov_base = page_address(p);
 352                 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
 353                 len -= rqstp->rq_vec[v].iov_len;
 354                 v++;
 355         }
 356         args->vlen = v;
 357         return xdr_argsize_check(rqstp, p);
 358 }
 359
 360 int
 361 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
 362 {
 363         struct nfsd3_writeargs *args = rqstp->rq_argp;
 364         unsigned int len, v, hdr, dlen;
 365         u32 max_blocksize = svc_max_payload(rqstp);
 366         struct kvec *head = rqstp->rq_arg.head;
 367         struct kvec *tail = rqstp->rq_arg.tail;
 368
 369         p = decode_fh(p, &args->fh);
 370         if (!p)
 371                 return 0;
 372         p = xdr_decode_hyper(p, &args->offset);
 373
 374         args->count = ntohl(*p++);
 375         args->stable = ntohl(*p++);
 376         len = args->len = ntohl(*p++);
 377         if ((void *)p > head->iov_base + head->iov_len)
 378                 return 0;
 379         /*
 380          * The count must equal the amount of data passed.
 381          */
 382         if (args->count != args->len)
 383                 return 0;
 384
 385         /*
 386          * Check to make sure that we got the right number of
 387          * bytes.
 388          */
 389         hdr = (void*)p - head->iov_base;
 390         dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - 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 = head->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 {
 423         struct nfsd3_createargs *args = rqstp->rq_argp;
 424
 425         if (!(p = decode_fh(p, &args->fh))
 426          || !(p = decode_filename(p, &args->name, &args->len)))
 427                 return 0;
 428
 429         switch (args->createmode = ntohl(*p++)) {
 430         case NFS3_CREATE_UNCHECKED:
 431         case NFS3_CREATE_GUARDED:
 432                 p = decode_sattr3(p, &args->attrs);
 433                 break;
 434         case NFS3_CREATE_EXCLUSIVE:
 435                 args->verf = p;
 436                 p += 2;
 437                 break;
 438         default:
 439                 return 0;
 440         }
 441
 442         return xdr_argsize_check(rqstp, p);
 443 }
 444
 445 int
 446 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
 447 {
 448         struct nfsd3_createargs *args = rqstp->rq_argp;
 449
 450         if (!(p = decode_fh(p, &args->fh)) ||
 451             !(p = decode_filename(p, &args->name, &args->len)))
 452                 return 0;
 453         p = decode_sattr3(p, &args->attrs);
 454
 455         return xdr_argsize_check(rqstp, p);
 456 }
 457
 458 int
 459 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
 460 {
 461         struct nfsd3_symlinkargs *args = rqstp->rq_argp;
 462         unsigned int len, avail;
 463         char *old, *new;
 464         struct kvec *vec;
 465
 466         if (!(p = decode_fh(p, &args->ffh)) ||
 467             !(p = decode_filename(p, &args->fname, &args->flen))
 468                 )
 469                 return 0;
 470         p = decode_sattr3(p, &args->attrs);
 471
 472         /* now decode the pathname, which might be larger than the first page.
 473          * As we have to check for nul's anyway, we copy it into a new page
 474          * This page appears in the rq_res.pages list, but as pages_len is always
 475          * 0, it won't get in the way
 476          */
 477         len = ntohl(*p++);
 478         if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
 479                 return 0;
 480         args->tname = new = page_address(*(rqstp->rq_next_page++));
 481         args->tlen = len;
 482         /* first copy and check from the first page */
 483         old = (char*)p;
 484         vec = &rqstp->rq_arg.head[0];
 485         if ((void *)old > vec->iov_base + vec->iov_len)
 486                 return 0;
 487         avail = vec->iov_len - (old - (char*)vec->iov_base);
 488         while (len && avail && *old) {
 489                 *new++ = *old++;
 490                 len--;
 491                 avail--;
 492         }
 493         /* now copy next page if there is one */
 494         if (len && !avail && rqstp->rq_arg.page_len) {
 495                 avail = min_t(unsigned int, rqstp->rq_arg.page_len, PAGE_SIZE);
 496                 old = page_address(rqstp->rq_arg.pages[0]);
 497         }
 498         while (len && avail && *old) {
 499                 *new++ = *old++;
 500                 len--;
 501                 avail--;
 502         }
 503         *new = '\0';
 504         if (len)
 505                 return 0;
 506
 507         return 1;
 508 }
 509
 510 int
 511 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
 512 {
 513         struct nfsd3_mknodargs *args = rqstp->rq_argp;
 514
 515         if (!(p = decode_fh(p, &args->fh))
 516          || !(p = decode_filename(p, &args->name, &args->len)))
 517                 return 0;
 518
 519         args->ftype = ntohl(*p++);
 520
 521         if (args->ftype == NF3BLK  || args->ftype == NF3CHR
 522          || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
 523                 p = decode_sattr3(p, &args->attrs);
 524
 525         if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
 526                 args->major = ntohl(*p++);
 527                 args->minor = ntohl(*p++);
 528         }
 529
 530         return xdr_argsize_check(rqstp, p);
 531 }
 532
 533 int
 534 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
 535 {
 536         struct nfsd3_renameargs *args = rqstp->rq_argp;
 537
 538         if (!(p = decode_fh(p, &args->ffh))
 539          || !(p = decode_filename(p, &args->fname, &args->flen))
 540          || !(p = decode_fh(p, &args->tfh))
 541          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 542                 return 0;
 543
 544         return xdr_argsize_check(rqstp, p);
 545 }
 546
 547 int
 548 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
 549 {
 550         struct nfsd3_readlinkargs *args = rqstp->rq_argp;
 551
 552         p = decode_fh(p, &args->fh);
 553         if (!p)
 554                 return 0;
 555         args->buffer = page_address(*(rqstp->rq_next_page++));
 556
 557         return xdr_argsize_check(rqstp, p);
 558 }
 559
 560 int
 561 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
 562 {
 563         struct nfsd3_linkargs *args = rqstp->rq_argp;
 564
 565         if (!(p = decode_fh(p, &args->ffh))
 566          || !(p = decode_fh(p, &args->tfh))
 567          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 568                 return 0;
 569
 570         return xdr_argsize_check(rqstp, p);
 571 }
 572
 573 int
 574 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
 575 {
 576         struct nfsd3_readdirargs *args = rqstp->rq_argp;
 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         args->count  = min_t(u32, args->count, PAGE_SIZE);
 585         args->buffer = page_address(*(rqstp->rq_next_page++));
 586
 587         return xdr_argsize_check(rqstp, p);
 588 }
 589
 590 int
 591 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
 592 {
 593         struct nfsd3_readdirargs *args = rqstp->rq_argp;
 594         int len;
 595         u32 max_blocksize = svc_max_payload(rqstp);
 596
 597         p = decode_fh(p, &args->fh);
 598         if (!p)
 599                 return 0;
 600         p = xdr_decode_hyper(p, &args->cookie);
 601         args->verf     = p; p += 2;
 602         args->dircount = ntohl(*p++);
 603         args->count    = ntohl(*p++);
 604
 605         len = args->count = min(args->count, max_blocksize);
 606         while (len > 0) {
 607                 struct page *p = *(rqstp->rq_next_page++);
 608                 if (!args->buffer)
 609                         args->buffer = page_address(p);
 610                 len -= PAGE_SIZE;
 611         }
 612
 613         return xdr_argsize_check(rqstp, p);
 614 }
 615
 616 int
 617 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
 618 {
 619         struct nfsd3_commitargs *args = rqstp->rq_argp;
 620         p = decode_fh(p, &args->fh);
 621         if (!p)
 622                 return 0;
 623         p = xdr_decode_hyper(p, &args->offset);
 624         args->count = ntohl(*p++);
 625
 626         return xdr_argsize_check(rqstp, p);
 627 }
 628
 629 /*
 630  * XDR encode functions
 631  */
 632 /*
 633  * There must be an encoding function for void results so svc_process
 634  * will work properly.
 635  */
 636 int
 637 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
 638 {
 639         return xdr_ressize_check(rqstp, p);
 640 }
 641
 642 /* GETATTR */
 643 int
 644 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
 645 {
 646         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 647
 648         if (resp->status == 0) {
 649                 lease_get_mtime(d_inode(resp->fh.fh_dentry),
 650                                 &resp->stat.mtime);
 651                 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
 652         }
 653         return xdr_ressize_check(rqstp, p);
 654 }
 655
 656 /* SETATTR, REMOVE, RMDIR */
 657 int
 658 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p)
 659 {
 660         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 661
 662         p = encode_wcc_data(rqstp, p, &resp->fh);
 663         return xdr_ressize_check(rqstp, p);
 664 }
 665
 666 /* LOOKUP */
 667 int
 668 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
 669 {
 670         struct nfsd3_diropres *resp = rqstp->rq_resp;
 671
 672         if (resp->status == 0) {
 673                 p = encode_fh(p, &resp->fh);
 674                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 675         }
 676         p = encode_post_op_attr(rqstp, p, &resp->dirfh);
 677         return xdr_ressize_check(rqstp, p);
 678 }
 679
 680 /* ACCESS */
 681 int
 682 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
 683 {
 684         struct nfsd3_accessres *resp = rqstp->rq_resp;
 685
 686         p = encode_post_op_attr(rqstp, p, &resp->fh);
 687         if (resp->status == 0)
 688                 *p++ = htonl(resp->access);
 689         return xdr_ressize_check(rqstp, p);
 690 }
 691
 692 /* READLINK */
 693 int
 694 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
 695 {
 696         struct nfsd3_readlinkres *resp = rqstp->rq_resp;
 697
 698         p = encode_post_op_attr(rqstp, p, &resp->fh);
 699         if (resp->status == 0) {
 700                 *p++ = htonl(resp->len);
 701                 xdr_ressize_check(rqstp, p);
 702                 rqstp->rq_res.page_len = resp->len;
 703                 if (resp->len & 3) {
 704                         /* need to pad the tail */
 705                         rqstp->rq_res.tail[0].iov_base = p;
 706                         *p = 0;
 707                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
 708                 }
 709                 return 1;
 710         } else
 711                 return xdr_ressize_check(rqstp, p);
 712 }
 713
 714 /* READ */
 715 int
 716 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
 717 {
 718         struct nfsd3_readres *resp = rqstp->rq_resp;
 719
 720         p = encode_post_op_attr(rqstp, p, &resp->fh);
 721         if (resp->status == 0) {
 722                 *p++ = htonl(resp->count);
 723                 *p++ = htonl(resp->eof);
 724                 *p++ = htonl(resp->count);      /* xdr opaque count */
 725                 xdr_ressize_check(rqstp, p);
 726                 /* now update rqstp->rq_res to reflect data as well */
 727                 rqstp->rq_res.page_len = resp->count;
 728                 if (resp->count & 3) {
 729                         /* need to pad the tail */
 730                         rqstp->rq_res.tail[0].iov_base = p;
 731                         *p = 0;
 732                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
 733                 }
 734                 return 1;
 735         } else
 736                 return xdr_ressize_check(rqstp, p);
 737 }
 738
 739 /* WRITE */
 740 int
 741 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
 742 {
 743         struct nfsd3_writeres *resp = rqstp->rq_resp;
 744         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 745
 746         p = encode_wcc_data(rqstp, p, &resp->fh);
 747         if (resp->status == 0) {
 748                 *p++ = htonl(resp->count);
 749                 *p++ = htonl(resp->committed);
 750                 *p++ = htonl(nn->nfssvc_boot.tv_sec);
 751                 *p++ = htonl(nn->nfssvc_boot.tv_usec);
 752         }
 753         return xdr_ressize_check(rqstp, p);
 754 }
 755
 756 /* CREATE, MKDIR, SYMLINK, MKNOD */
 757 int
 758 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p)
 759 {
 760         struct nfsd3_diropres *resp = rqstp->rq_resp;
 761
 762         if (resp->status == 0) {
 763                 *p++ = xdr_one;
 764                 p = encode_fh(p, &resp->fh);
 765                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 766         }
 767         p = encode_wcc_data(rqstp, p, &resp->dirfh);
 768         return xdr_ressize_check(rqstp, p);
 769 }
 770
 771 /* RENAME */
 772 int
 773 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p)
 774 {
 775         struct nfsd3_renameres *resp = rqstp->rq_resp;
 776
 777         p = encode_wcc_data(rqstp, p, &resp->ffh);
 778         p = encode_wcc_data(rqstp, p, &resp->tfh);
 779         return xdr_ressize_check(rqstp, p);
 780 }
 781
 782 /* LINK */
 783 int
 784 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p)
 785 {
 786         struct nfsd3_linkres *resp = rqstp->rq_resp;
 787
 788         p = encode_post_op_attr(rqstp, p, &resp->fh);
 789         p = encode_wcc_data(rqstp, p, &resp->tfh);
 790         return xdr_ressize_check(rqstp, p);
 791 }
 792
 793 /* READDIR */
 794 int
 795 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
 796 {
 797         struct nfsd3_readdirres *resp = rqstp->rq_resp;
 798
 799         p = encode_post_op_attr(rqstp, p, &resp->fh);
 800
 801         if (resp->status == 0) {
 802                 /* stupid readdir cookie */
 803                 memcpy(p, resp->verf, 8); p += 2;
 804                 xdr_ressize_check(rqstp, p);
 805                 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
 806                         return 1; /*No room for trailer */
 807                 rqstp->rq_res.page_len = (resp->count) << 2;
 808
 809                 /* add the 'tail' to the end of the 'head' page - page 0. */
 810                 rqstp->rq_res.tail[0].iov_base = p;
 811                 *p++ = 0;               /* no more entries */
 812                 *p++ = htonl(resp->common.err == nfserr_eof);
 813                 rqstp->rq_res.tail[0].iov_len = 2<<2;
 814                 return 1;
 815         } else
 816                 return xdr_ressize_check(rqstp, p);
 817 }
 818
 819 static __be32 *
 820 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
 821              int namlen, u64 ino)
 822 {
 823         *p++ = xdr_one;                          /* mark entry present */
 824         p    = xdr_encode_hyper(p, ino);         /* file id */
 825         p    = xdr_encode_array(p, name, namlen);/* name length & name */
 826
 827         cd->offset = p;                         /* remember pointer */
 828         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
 829
 830         return p;
 831 }
 832
 833 static __be32
 834 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
 835                  const char *name, int namlen, u64 ino)
 836 {
 837         struct svc_export       *exp;
 838         struct dentry           *dparent, *dchild;
 839         __be32 rv = nfserr_noent;
 840
 841         dparent = cd->fh.fh_dentry;
 842         exp  = cd->fh.fh_export;
 843
 844         if (isdotent(name, namlen)) {
 845                 if (namlen == 2) {
 846                         dchild = dget_parent(dparent);
 847                         /* filesystem root - cannot return filehandle for ".." */
 848                         if (dchild == dparent)
 849                                 goto out;
 850                 } else
 851                         dchild = dget(dparent);
 852         } else
 853                 dchild = lookup_one_len_unlocked(name, dparent, namlen);
 854         if (IS_ERR(dchild))
 855                 return rv;
 856         if (d_mountpoint(dchild))
 857                 goto out;
 858         if (d_really_is_negative(dchild))
 859                 goto out;
 860         if (dchild->d_inode->i_ino != ino)
 861                 goto out;
 862         rv = fh_compose(fhp, exp, dchild, &cd->fh);
 863 out:
 864         dput(dchild);
 865         return rv;
 866 }
 867
 868 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
 869 {
 870         struct svc_fh   *fh = &cd->scratch;
 871         __be32 err;
 872
 873         fh_init(fh, NFS3_FHSIZE);
 874         err = compose_entry_fh(cd, fh, name, namlen, ino);
 875         if (err) {
 876                 *p++ = 0;
 877                 *p++ = 0;
 878                 goto out;
 879         }
 880         p = encode_post_op_attr(cd->rqstp, p, fh);
 881         *p++ = xdr_one;                 /* yes, a file handle follows */
 882         p = encode_fh(p, fh);
 883 out:
 884         fh_put(fh);
 885         return p;
 886 }
 887
 888 /*
 889  * Encode a directory entry. This one works for both normal readdir
 890  * and readdirplus.
 891  * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
 892  * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
 893  *
 894  * The readdirplus baggage is 1+21 words for post_op_attr, plus the
 895  * file handle.
 896  */
 897
 898 #define NFS3_ENTRY_BAGGAGE      (2 + 1 + 2 + 1)
 899 #define NFS3_ENTRYPLUS_BAGGAGE  (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
 900 static int
 901 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
 902              loff_t offset, u64 ino, unsigned int d_type, int plus)
 903 {
 904         struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
 905                                                         common);
 906         __be32          *p = cd->buffer;
 907         caddr_t         curr_page_addr = NULL;
 908         struct page **  page;
 909         int             slen;           /* string (name) length */
 910         int             elen;           /* estimated entry length in words */
 911         int             num_entry_words = 0;    /* actual number of words */
 912
 913         if (cd->offset) {
 914                 u64 offset64 = offset;
 915
 916                 if (unlikely(cd->offset1)) {
 917                         /* we ended up with offset on a page boundary */
 918                         *cd->offset = htonl(offset64 >> 32);
 919                         *cd->offset1 = htonl(offset64 & 0xffffffff);
 920                         cd->offset1 = NULL;
 921                 } else {
 922                         xdr_encode_hyper(cd->offset, offset64);
 923                 }
 924         }
 925
 926         /*
 927         dprintk("encode_entry(%.*s @%ld%s)\n",
 928                 namlen, name, (long) offset, plus? " plus" : "");
 929          */
 930
 931         /* truncate filename if too long */
 932         namlen = min(namlen, NFS3_MAXNAMLEN);
 933
 934         slen = XDR_QUADLEN(namlen);
 935         elen = slen + NFS3_ENTRY_BAGGAGE
 936                 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
 937
 938         if (cd->buflen < elen) {
 939                 cd->common.err = nfserr_toosmall;
 940                 return -EINVAL;
 941         }
 942
 943         /* determine which page in rq_respages[] we are currently filling */
 944         for (page = cd->rqstp->rq_respages + 1;
 945                                 page < cd->rqstp->rq_next_page; page++) {
 946                 curr_page_addr = page_address(*page);
 947
 948                 if (((caddr_t)cd->buffer >= curr_page_addr) &&
 949                     ((caddr_t)cd->buffer <  curr_page_addr + PAGE_SIZE))
 950                         break;
 951         }
 952
 953         if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
 954                 /* encode entry in current page */
 955
 956                 p = encode_entry_baggage(cd, p, name, namlen, ino);
 957
 958                 if (plus)
 959                         p = encode_entryplus_baggage(cd, p, name, namlen, ino);
 960                 num_entry_words = p - cd->buffer;
 961         } else if (*(page+1) != NULL) {
 962                 /* temporarily encode entry into next page, then move back to
 963                  * current and next page in rq_respages[] */
 964                 __be32 *p1, *tmp;
 965                 int len1, len2;
 966
 967                 /* grab next page for temporary storage of entry */
 968                 p1 = tmp = page_address(*(page+1));
 969
 970                 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
 971
 972                 if (plus)
 973                         p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
 974
 975                 /* determine entry word length and lengths to go in pages */
 976                 num_entry_words = p1 - tmp;
 977                 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
 978                 if ((num_entry_words << 2) < len1) {
 979                         /* the actual number of words in the entry is less
 980                          * than elen and can still fit in the current page
 981                          */
 982                         memmove(p, tmp, num_entry_words << 2);
 983                         p += num_entry_words;
 984
 985                         /* update offset */
 986                         cd->offset = cd->buffer + (cd->offset - tmp);
 987                 } else {
 988                         unsigned int offset_r = (cd->offset - tmp) << 2;
 989
 990                         /* update pointer to offset location.
 991                          * This is a 64bit quantity, so we need to
 992                          * deal with 3 cases:
 993                          *  -   entirely in first page
 994                          *  -   entirely in second page
 995                          *  -   4 bytes in each page
 996                          */
 997                         if (offset_r + 8 <= len1) {
 998                                 cd->offset = p + (cd->offset - tmp);
 999                         } else if (offset_r >= len1) {
1000                                 cd->offset -= len1 >> 2;
1001                         } else {
1002                                 /* sitting on the fence */
1003                                 BUG_ON(offset_r != len1 - 4);
1004                                 cd->offset = p + (cd->offset - tmp);
1005                                 cd->offset1 = tmp;
1006                         }
1007
1008                         len2 = (num_entry_words << 2) - len1;
1009
1010                         /* move from temp page to current and next pages */
1011                         memmove(p, tmp, len1);
1012                         memmove(tmp, (caddr_t)tmp+len1, len2);
1013
1014                         p = tmp + (len2 >> 2);
1015                 }
1016         }
1017         else {
1018                 cd->common.err = nfserr_toosmall;
1019                 return -EINVAL;
1020         }
1021
1022         cd->buflen -= num_entry_words;
1023         cd->buffer = p;
1024         cd->common.err = nfs_ok;
1025         return 0;
1026
1027 }
1028
1029 int
1030 nfs3svc_encode_entry(void *cd, const char *name,
1031                      int namlen, loff_t offset, u64 ino, unsigned int d_type)
1032 {
1033         return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1034 }
1035
1036 int
1037 nfs3svc_encode_entry_plus(void *cd, const char *name,
1038                           int namlen, loff_t offset, u64 ino,
1039                           unsigned int d_type)
1040 {
1041         return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1042 }
1043
1044 /* FSSTAT */
1045 int
1046 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p)
1047 {
1048         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
1049         struct kstatfs  *s = &resp->stats;
1050         u64             bs = s->f_bsize;
1051
1052         *p++ = xdr_zero;        /* no post_op_attr */
1053
1054         if (resp->status == 0) {
1055                 p = xdr_encode_hyper(p, bs * s->f_blocks);      /* total bytes */
1056                 p = xdr_encode_hyper(p, bs * s->f_bfree);       /* free bytes */
1057                 p = xdr_encode_hyper(p, bs * s->f_bavail);      /* user available bytes */
1058                 p = xdr_encode_hyper(p, s->f_files);    /* total inodes */
1059                 p = xdr_encode_hyper(p, s->f_ffree);    /* free inodes */
1060                 p = xdr_encode_hyper(p, s->f_ffree);    /* user available inodes */
1061                 *p++ = htonl(resp->invarsec);   /* mean unchanged time */
1062         }
1063         return xdr_ressize_check(rqstp, p);
1064 }
1065
1066 /* FSINFO */
1067 int
1068 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p)
1069 {
1070         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
1071
1072         *p++ = xdr_zero;        /* no post_op_attr */
1073
1074         if (resp->status == 0) {
1075                 *p++ = htonl(resp->f_rtmax);
1076                 *p++ = htonl(resp->f_rtpref);
1077                 *p++ = htonl(resp->f_rtmult);
1078                 *p++ = htonl(resp->f_wtmax);
1079                 *p++ = htonl(resp->f_wtpref);
1080                 *p++ = htonl(resp->f_wtmult);
1081                 *p++ = htonl(resp->f_dtpref);
1082                 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1083                 *p++ = xdr_one;
1084                 *p++ = xdr_zero;
1085                 *p++ = htonl(resp->f_properties);
1086         }
1087
1088         return xdr_ressize_check(rqstp, p);
1089 }
1090
1091 /* PATHCONF */
1092 int
1093 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p)
1094 {
1095         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
1096
1097         *p++ = xdr_zero;        /* no post_op_attr */
1098
1099         if (resp->status == 0) {
1100                 *p++ = htonl(resp->p_link_max);
1101                 *p++ = htonl(resp->p_name_max);
1102                 *p++ = htonl(resp->p_no_trunc);
1103                 *p++ = htonl(resp->p_chown_restricted);
1104                 *p++ = htonl(resp->p_case_insensitive);
1105                 *p++ = htonl(resp->p_case_preserving);
1106         }
1107
1108         return xdr_ressize_check(rqstp, p);
1109 }
1110
1111 /* COMMIT */
1112 int
1113 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
1114 {
1115         struct nfsd3_commitres *resp = rqstp->rq_resp;
1116         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1117
1118         p = encode_wcc_data(rqstp, p, &resp->fh);
1119         /* Write verifier */
1120         if (resp->status == 0) {
1121                 *p++ = htonl(nn->nfssvc_boot.tv_sec);
1122                 *p++ = htonl(nn->nfssvc_boot.tv_usec);
1123         }
1124         return xdr_ressize_check(rqstp, p);
1125 }
1126
1127 /*
1128  * XDR release functions
1129  */
1130 void
1131 nfs3svc_release_fhandle(struct svc_rqst *rqstp)
1132 {
1133         struct nfsd3_attrstat *resp = rqstp->rq_resp;
1134
1135         fh_put(&resp->fh);
1136 }
1137
1138 void
1139 nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
1140 {
1141         struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;
1142
1143         fh_put(&resp->fh1);
1144         fh_put(&resp->fh2);
1145 }