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