fs/nfsd/nfs3xdr.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * XDR support for nfsd/protocol version 3.
   4  *
   5  * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
   6  *
   7  * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
   8  */
   9
  10 #include <linux/namei.h>
  11 #include <linux/sunrpc/svc_xprt.h>
  12 #include "xdr3.h"
  13 #include "auth.h"
  14 #include "netns.h"
  15 #include "vfs.h"
  16
  17 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  18
  19
  20 /*
  21  * Mapping of S_IF* types to NFS file types
  22  */
  23 static u32      nfs3_ftypes[] = {
  24         NF3NON,  NF3FIFO, NF3CHR, NF3BAD,
  25         NF3DIR,  NF3BAD,  NF3BLK, NF3BAD,
  26         NF3REG,  NF3BAD,  NF3LNK, NF3BAD,
  27         NF3SOCK, NF3BAD,  NF3LNK, NF3BAD,
  28 };
  29
  30 /*
  31  * XDR functions for basic NFS types
  32  */
  33 static __be32 *
  34 encode_time3(__be32 *p, struct timespec *time)
  35 {
  36         *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
  37         return p;
  38 }
  39
  40 static __be32 *
  41 decode_time3(__be32 *p, struct timespec *time)
  42 {
  43         time->tv_sec = ntohl(*p++);
  44         time->tv_nsec = ntohl(*p++);
  45         return p;
  46 }
  47
  48 static __be32 *
  49 decode_fh(__be32 *p, struct svc_fh *fhp)
  50 {
  51         unsigned int size;
  52         fh_init(fhp, NFS3_FHSIZE);
  53         size = ntohl(*p++);
  54         if (size > NFS3_FHSIZE)
  55                 return NULL;
  56
  57         memcpy(&fhp->fh_handle.fh_base, p, size);
  58         fhp->fh_handle.fh_size = size;
  59         return p + XDR_QUADLEN(size);
  60 }
  61
  62 /* Helper function for NFSv3 ACL code */
  63 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
  64 {
  65         return decode_fh(p, fhp);
  66 }
  67
  68 static __be32 *
  69 encode_fh(__be32 *p, struct svc_fh *fhp)
  70 {
  71         unsigned int size = fhp->fh_handle.fh_size;
  72         *p++ = htonl(size);
  73         if (size) p[XDR_QUADLEN(size)-1]=0;
  74         memcpy(p, &fhp->fh_handle.fh_base, size);
  75         return p + XDR_QUADLEN(size);
  76 }
  77
  78 /*
  79  * Decode a file name and make sure that the path contains
  80  * no slashes or null bytes.
  81  */
  82 static __be32 *
  83 decode_filename(__be32 *p, char **namp, unsigned int *lenp)
  84 {
  85         char            *name;
  86         unsigned int    i;
  87
  88         if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
  89                 for (i = 0, name = *namp; i < *lenp; i++, name++) {
  90                         if (*name == '\0' || *name == '/')
  91                                 return NULL;
  92                 }
  93         }
  94
  95         return p;
  96 }
  97
  98 static __be32 *
  99 decode_sattr3(__be32 *p, struct iattr *iap)
 100 {
 101         u32     tmp;
 102
 103         iap->ia_valid = 0;
 104
 105         if (*p++) {
 106                 iap->ia_valid |= ATTR_MODE;
 107                 iap->ia_mode = ntohl(*p++);
 108         }
 109         if (*p++) {
 110                 iap->ia_uid = make_kuid(&init_user_ns, ntohl(*p++));
 111                 if (uid_valid(iap->ia_uid))
 112                         iap->ia_valid |= ATTR_UID;
 113         }
 114         if (*p++) {
 115                 iap->ia_gid = make_kgid(&init_user_ns, ntohl(*p++));
 116                 if (gid_valid(iap->ia_gid))
 117                         iap->ia_valid |= ATTR_GID;
 118         }
 119         if (*p++) {
 120                 u64     newsize;
 121
 122                 iap->ia_valid |= ATTR_SIZE;
 123                 p = xdr_decode_hyper(p, &newsize);
 124                 iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
 125         }
 126         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 127                 iap->ia_valid |= ATTR_ATIME;
 128         } else if (tmp == 2) {          /* set to client time */
 129                 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
 130                 iap->ia_atime.tv_sec = ntohl(*p++);
 131                 iap->ia_atime.tv_nsec = ntohl(*p++);
 132         }
 133         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 134                 iap->ia_valid |= ATTR_MTIME;
 135         } else if (tmp == 2) {          /* set to client time */
 136                 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
 137                 iap->ia_mtime.tv_sec = ntohl(*p++);
 138                 iap->ia_mtime.tv_nsec = ntohl(*p++);
 139         }
 140         return p;
 141 }
 142
 143 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
 144 {
 145         u64 f;
 146         switch(fsid_source(fhp)) {
 147         default:
 148         case FSIDSOURCE_DEV:
 149                 p = xdr_encode_hyper(p, (u64)huge_encode_dev
 150                                      (fhp->fh_dentry->d_sb->s_dev));
 151                 break;
 152         case FSIDSOURCE_FSID:
 153                 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
 154                 break;
 155         case FSIDSOURCE_UUID:
 156                 f = ((u64*)fhp->fh_export->ex_uuid)[0];
 157                 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
 158                 p = xdr_encode_hyper(p, f);
 159                 break;
 160         }
 161         return p;
 162 }
 163
 164 static __be32 *
 165 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
 166               struct kstat *stat)
 167 {
 168         *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
 169         *p++ = htonl((u32) (stat->mode & S_IALLUGO));
 170         *p++ = htonl((u32) stat->nlink);
 171         *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
 172         *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
 173         if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
 174                 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
 175         } else {
 176                 p = xdr_encode_hyper(p, (u64) stat->size);
 177         }
 178         p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
 179         *p++ = htonl((u32) MAJOR(stat->rdev));
 180         *p++ = htonl((u32) MINOR(stat->rdev));
 181         p = encode_fsid(p, fhp);
 182         p = xdr_encode_hyper(p, stat->ino);
 183         p = encode_time3(p, &stat->atime);
 184         p = encode_time3(p, &stat->mtime);
 185         p = encode_time3(p, &stat->ctime);
 186
 187         return p;
 188 }
 189
 190 static __be32 *
 191 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 192 {
 193         /* Attributes to follow */
 194         *p++ = xdr_one;
 195         return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
 196 }
 197
 198 /*
 199  * Encode post-operation attributes.
 200  * The inode may be NULL if the call failed because of a stale file
 201  * handle. In this case, no attributes are returned.
 202  */
 203 static __be32 *
 204 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 205 {
 206         struct dentry *dentry = fhp->fh_dentry;
 207         if (dentry && d_really_is_positive(dentry)) {
 208                 __be32 err;
 209                 struct kstat stat;
 210
 211                 err = fh_getattr(fhp, &stat);
 212                 if (!err) {
 213                         *p++ = xdr_one;         /* attributes follow */
 214                         lease_get_mtime(d_inode(dentry), &stat.mtime);
 215                         return encode_fattr3(rqstp, p, fhp, &stat);
 216                 }
 217         }
 218         *p++ = xdr_zero;
 219         return p;
 220 }
 221
 222 /* Helper for NFSv3 ACLs */
 223 __be32 *
 224 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 225 {
 226         return encode_post_op_attr(rqstp, p, fhp);
 227 }
 228
 229 /*
 230  * Enocde weak cache consistency data
 231  */
 232 static __be32 *
 233 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 234 {
 235         struct dentry   *dentry = fhp->fh_dentry;
 236
 237         if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
 238                 if (fhp->fh_pre_saved) {
 239                         *p++ = xdr_one;
 240                         p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
 241                         p = encode_time3(p, &fhp->fh_pre_mtime);
 242                         p = encode_time3(p, &fhp->fh_pre_ctime);
 243                 } else {
 244                         *p++ = xdr_zero;
 245                 }
 246                 return encode_saved_post_attr(rqstp, p, fhp);
 247         }
 248         /* no pre- or post-attrs */
 249         *p++ = xdr_zero;
 250         return encode_post_op_attr(rqstp, p, fhp);
 251 }
 252
 253 /*
 254  * Fill in the post_op attr for the wcc data
 255  */
 256 void fill_post_wcc(struct svc_fh *fhp)
 257 {
 258         __be32 err;
 259
 260         if (fhp->fh_post_saved)
 261                 printk("nfsd: inode locked twice during operation.\n");
 262
 263         err = fh_getattr(fhp, &fhp->fh_post_attr);
 264         fhp->fh_post_change = nfsd4_change_attribute(d_inode(fhp->fh_dentry));
 265         if (err) {
 266                 fhp->fh_post_saved = false;
 267                 /* Grab the ctime anyway - set_change_info might use it */
 268                 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
 269         } else
 270                 fhp->fh_post_saved = true;
 271 }
 272
 273 /*
 274  * XDR decode functions
 275  */
 276 int
 277 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
 278 {
 279         struct nfsd_fhandle *args = rqstp->rq_argp;
 280
 281         p = decode_fh(p, &args->fh);
 282         if (!p)
 283                 return 0;
 284         return xdr_argsize_check(rqstp, p);
 285 }
 286
 287 int
 288 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
 289 {
 290         struct nfsd3_sattrargs *args = rqstp->rq_argp;
 291
 292         p = decode_fh(p, &args->fh);
 293         if (!p)
 294                 return 0;
 295         p = decode_sattr3(p, &args->attrs);
 296
 297         if ((args->check_guard = ntohl(*p++)) != 0) {
 298                 struct timespec time;
 299                 p = decode_time3(p, &time);
 300                 args->guardtime = time.tv_sec;
 301         }
 302
 303         return xdr_argsize_check(rqstp, p);
 304 }
 305
 306 int
 307 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
 308 {
 309         struct nfsd3_diropargs *args = rqstp->rq_argp;
 310
 311         if (!(p = decode_fh(p, &args->fh))
 312          || !(p = decode_filename(p, &args->name, &args->len)))
 313                 return 0;
 314
 315         return xdr_argsize_check(rqstp, p);
 316 }
 317
 318 int
 319 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
 320 {
 321         struct nfsd3_accessargs *args = rqstp->rq_argp;
 322
 323         p = decode_fh(p, &args->fh);
 324         if (!p)
 325                 return 0;
 326         args->access = ntohl(*p++);
 327
 328         return xdr_argsize_check(rqstp, p);
 329 }
 330
 331 int
 332 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
 333 {
 334         struct nfsd3_readargs *args = rqstp->rq_argp;
 335         unsigned int len;
 336         int v;
 337         u32 max_blocksize = svc_max_payload(rqstp);
 338
 339         p = decode_fh(p, &args->fh);
 340         if (!p)
 341                 return 0;
 342         p = xdr_decode_hyper(p, &args->offset);
 343
 344         args->count = ntohl(*p++);
 345         len = min(args->count, max_blocksize);
 346
 347         /* set up the kvec */
 348         v=0;
 349         while (len > 0) {
 350                 struct page *p = *(rqstp->rq_next_page++);
 351
 352                 rqstp->rq_vec[v].iov_base = page_address(p);
 353                 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
 354                 len -= rqstp->rq_vec[v].iov_len;
 355                 v++;
 356         }
 357         args->vlen = v;
 358         return xdr_argsize_check(rqstp, p);
 359 }
 360
 361 int
 362 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
 363 {
 364         struct nfsd3_writeargs *args = rqstp->rq_argp;
 365         unsigned int len, v, hdr, dlen;
 366         u32 max_blocksize = svc_max_payload(rqstp);
 367         struct kvec *head = rqstp->rq_arg.head;
 368         struct kvec *tail = rqstp->rq_arg.tail;
 369
 370         p = decode_fh(p, &args->fh);
 371         if (!p)
 372                 return 0;
 373         p = xdr_decode_hyper(p, &args->offset);
 374
 375         args->count = ntohl(*p++);
 376         args->stable = ntohl(*p++);
 377         len = args->len = ntohl(*p++);
 378         if ((void *)p > head->iov_base + head->iov_len)
 379                 return 0;
 380         /*
 381          * The count must equal the amount of data passed.
 382          */
 383         if (args->count != args->len)
 384                 return 0;
 385
 386         /*
 387          * Check to make sure that we got the right number of
 388          * bytes.
 389          */
 390         hdr = (void*)p - head->iov_base;
 391         dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr;
 392         /*
 393          * Round the length of the data which was specified up to
 394          * the next multiple of XDR units and then compare that
 395          * against the length which was actually received.
 396          * Note that when RPCSEC/GSS (for example) is used, the
 397          * data buffer can be padded so dlen might be larger
 398          * than required.  It must never be smaller.
 399          */
 400         if (dlen < XDR_QUADLEN(len)*4)
 401                 return 0;
 402
 403         if (args->count > max_blocksize) {
 404                 args->count = max_blocksize;
 405                 len = args->len = max_blocksize;
 406         }
 407         rqstp->rq_vec[0].iov_base = (void*)p;
 408         rqstp->rq_vec[0].iov_len = head->iov_len - hdr;
 409         v = 0;
 410         while (len > rqstp->rq_vec[v].iov_len) {
 411                 len -= rqstp->rq_vec[v].iov_len;
 412                 v++;
 413                 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
 414                 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 415         }
 416         rqstp->rq_vec[v].iov_len = len;
 417         args->vlen = v + 1;
 418         return 1;
 419 }
 420
 421 int
 422 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
 423 {
 424         struct nfsd3_createargs *args = rqstp->rq_argp;
 425
 426         if (!(p = decode_fh(p, &args->fh))
 427          || !(p = decode_filename(p, &args->name, &args->len)))
 428                 return 0;
 429
 430         switch (args->createmode = ntohl(*p++)) {
 431         case NFS3_CREATE_UNCHECKED:
 432         case NFS3_CREATE_GUARDED:
 433                 p = decode_sattr3(p, &args->attrs);
 434                 break;
 435         case NFS3_CREATE_EXCLUSIVE:
 436                 args->verf = p;
 437                 p += 2;
 438                 break;
 439         default:
 440                 return 0;
 441         }
 442
 443         return xdr_argsize_check(rqstp, p);
 444 }
 445
 446 int
 447 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
 448 {
 449         struct nfsd3_createargs *args = rqstp->rq_argp;
 450
 451         if (!(p = decode_fh(p, &args->fh)) ||
 452             !(p = decode_filename(p, &args->name, &args->len)))
 453                 return 0;
 454         p = decode_sattr3(p, &args->attrs);
 455
 456         return xdr_argsize_check(rqstp, p);
 457 }
 458
 459 int
 460 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
 461 {
 462         struct nfsd3_symlinkargs *args = rqstp->rq_argp;
 463         unsigned int len, avail;
 464         char *old, *new;
 465         struct kvec *vec;
 466
 467         if (!(p = decode_fh(p, &args->ffh)) ||
 468             !(p = decode_filename(p, &args->fname, &args->flen))
 469                 )
 470                 return 0;
 471         p = decode_sattr3(p, &args->attrs);
 472
 473         /* now decode the pathname, which might be larger than the first page.
 474          * As we have to check for nul's anyway, we copy it into a new page
 475          * This page appears in the rq_res.pages list, but as pages_len is always
 476          * 0, it won't get in the way
 477          */
 478         len = ntohl(*p++);
 479         if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
 480                 return 0;
 481         args->tname = new = page_address(*(rqstp->rq_next_page++));
 482         args->tlen = len;
 483         /* first copy and check from the first page */
 484         old = (char*)p;
 485         vec = &rqstp->rq_arg.head[0];
 486         if ((void *)old > vec->iov_base + vec->iov_len)
 487                 return 0;
 488         avail = vec->iov_len - (old - (char*)vec->iov_base);
 489         while (len && avail && *old) {
 490                 *new++ = *old++;
 491                 len--;
 492                 avail--;
 493         }
 494         /* now copy next page if there is one */
 495         if (len && !avail && rqstp->rq_arg.page_len) {
 496                 avail = min_t(unsigned int, rqstp->rq_arg.page_len, PAGE_SIZE);
 497                 old = page_address(rqstp->rq_arg.pages[0]);
 498         }
 499         while (len && avail && *old) {
 500                 *new++ = *old++;
 501                 len--;
 502                 avail--;
 503         }
 504         *new = '\0';
 505         if (len)
 506                 return 0;
 507
 508         return 1;
 509 }
 510
 511 int
 512 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
 513 {
 514         struct nfsd3_mknodargs *args = rqstp->rq_argp;
 515
 516         if (!(p = decode_fh(p, &args->fh))
 517          || !(p = decode_filename(p, &args->name, &args->len)))
 518                 return 0;
 519
 520         args->ftype = ntohl(*p++);
 521
 522         if (args->ftype == NF3BLK  || args->ftype == NF3CHR
 523          || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
 524                 p = decode_sattr3(p, &args->attrs);
 525
 526         if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
 527                 args->major = ntohl(*p++);
 528                 args->minor = ntohl(*p++);
 529         }
 530
 531         return xdr_argsize_check(rqstp, p);
 532 }
 533
 534 int
 535 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
 536 {
 537         struct nfsd3_renameargs *args = rqstp->rq_argp;
 538
 539         if (!(p = decode_fh(p, &args->ffh))
 540          || !(p = decode_filename(p, &args->fname, &args->flen))
 541          || !(p = decode_fh(p, &args->tfh))
 542          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 543                 return 0;
 544
 545         return xdr_argsize_check(rqstp, p);
 546 }
 547
 548 int
 549 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
 550 {
 551         struct nfsd3_readlinkargs *args = rqstp->rq_argp;
 552
 553         p = decode_fh(p, &args->fh);
 554         if (!p)
 555                 return 0;
 556         args->buffer = page_address(*(rqstp->rq_next_page++));
 557
 558         return xdr_argsize_check(rqstp, p);
 559 }
 560
 561 int
 562 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
 563 {
 564         struct nfsd3_linkargs *args = rqstp->rq_argp;
 565
 566         if (!(p = decode_fh(p, &args->ffh))
 567          || !(p = decode_fh(p, &args->tfh))
 568          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 569                 return 0;
 570
 571         return xdr_argsize_check(rqstp, p);
 572 }
 573
 574 int
 575 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
 576 {
 577         struct nfsd3_readdirargs *args = rqstp->rq_argp;
 578         p = decode_fh(p, &args->fh);
 579         if (!p)
 580                 return 0;
 581         p = xdr_decode_hyper(p, &args->cookie);
 582         args->verf   = p; p += 2;
 583         args->dircount = ~0;
 584         args->count  = ntohl(*p++);
 585         args->count  = min_t(u32, args->count, PAGE_SIZE);
 586         args->buffer = page_address(*(rqstp->rq_next_page++));
 587
 588         return xdr_argsize_check(rqstp, p);
 589 }
 590
 591 int
 592 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
 593 {
 594         struct nfsd3_readdirargs *args = rqstp->rq_argp;
 595         int len;
 596         u32 max_blocksize = svc_max_payload(rqstp);
 597
 598         p = decode_fh(p, &args->fh);
 599         if (!p)
 600                 return 0;
 601         p = xdr_decode_hyper(p, &args->cookie);
 602         args->verf     = p; p += 2;
 603         args->dircount = ntohl(*p++);
 604         args->count    = ntohl(*p++);
 605
 606         len = args->count = min(args->count, max_blocksize);
 607         while (len > 0) {
 608                 struct page *p = *(rqstp->rq_next_page++);
 609                 if (!args->buffer)
 610                         args->buffer = page_address(p);
 611                 len -= PAGE_SIZE;
 612         }
 613
 614         return xdr_argsize_check(rqstp, p);
 615 }
 616
 617 int
 618 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
 619 {
 620         struct nfsd3_commitargs *args = rqstp->rq_argp;
 621         p = decode_fh(p, &args->fh);
 622         if (!p)
 623                 return 0;
 624         p = xdr_decode_hyper(p, &args->offset);
 625         args->count = ntohl(*p++);
 626
 627         return xdr_argsize_check(rqstp, p);
 628 }
 629
 630 /*
 631  * XDR encode functions
 632  */
 633 /*
 634  * There must be an encoding function for void results so svc_process
 635  * will work properly.
 636  */
 637 int
 638 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
 639 {
 640         return xdr_ressize_check(rqstp, p);
 641 }
 642
 643 /* GETATTR */
 644 int
 645 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
 646 {
 647         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 648
 649         if (resp->status == 0) {
 650                 lease_get_mtime(d_inode(resp->fh.fh_dentry),
 651                                 &resp->stat.mtime);
 652                 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
 653         }
 654         return xdr_ressize_check(rqstp, p);
 655 }
 656
 657 /* SETATTR, REMOVE, RMDIR */
 658 int
 659 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p)
 660 {
 661         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 662
 663         p = encode_wcc_data(rqstp, p, &resp->fh);
 664         return xdr_ressize_check(rqstp, p);
 665 }
 666
 667 /* LOOKUP */
 668 int
 669 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
 670 {
 671         struct nfsd3_diropres *resp = rqstp->rq_resp;
 672
 673         if (resp->status == 0) {
 674                 p = encode_fh(p, &resp->fh);
 675                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 676         }
 677         p = encode_post_op_attr(rqstp, p, &resp->dirfh);
 678         return xdr_ressize_check(rqstp, p);
 679 }
 680
 681 /* ACCESS */
 682 int
 683 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
 684 {
 685         struct nfsd3_accessres *resp = rqstp->rq_resp;
 686
 687         p = encode_post_op_attr(rqstp, p, &resp->fh);
 688         if (resp->status == 0)
 689                 *p++ = htonl(resp->access);
 690         return xdr_ressize_check(rqstp, p);
 691 }
 692
 693 /* READLINK */
 694 int
 695 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
 696 {
 697         struct nfsd3_readlinkres *resp = rqstp->rq_resp;
 698
 699         p = encode_post_op_attr(rqstp, p, &resp->fh);
 700         if (resp->status == 0) {
 701                 *p++ = htonl(resp->len);
 702                 xdr_ressize_check(rqstp, p);
 703                 rqstp->rq_res.page_len = resp->len;
 704                 if (resp->len & 3) {
 705                         /* need to pad the tail */
 706                         rqstp->rq_res.tail[0].iov_base = p;
 707                         *p = 0;
 708                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
 709                 }
 710                 return 1;
 711         } else
 712                 return xdr_ressize_check(rqstp, p);
 713 }
 714
 715 /* READ */
 716 int
 717 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
 718 {
 719         struct nfsd3_readres *resp = rqstp->rq_resp;
 720
 721         p = encode_post_op_attr(rqstp, p, &resp->fh);
 722         if (resp->status == 0) {
 723                 *p++ = htonl(resp->count);
 724                 *p++ = htonl(resp->eof);
 725                 *p++ = htonl(resp->count);      /* xdr opaque count */
 726                 xdr_ressize_check(rqstp, p);
 727                 /* now update rqstp->rq_res to reflect data as well */
 728                 rqstp->rq_res.page_len = resp->count;
 729                 if (resp->count & 3) {
 730                         /* need to pad the tail */
 731                         rqstp->rq_res.tail[0].iov_base = p;
 732                         *p = 0;
 733                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
 734                 }
 735                 return 1;
 736         } else
 737                 return xdr_ressize_check(rqstp, p);
 738 }
 739
 740 /* WRITE */
 741 int
 742 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
 743 {
 744         struct nfsd3_writeres *resp = rqstp->rq_resp;
 745         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 746
 747         p = encode_wcc_data(rqstp, p, &resp->fh);
 748         if (resp->status == 0) {
 749                 *p++ = htonl(resp->count);
 750                 *p++ = htonl(resp->committed);
 751                 *p++ = htonl(nn->nfssvc_boot.tv_sec);
 752                 *p++ = htonl(nn->nfssvc_boot.tv_usec);
 753         }
 754         return xdr_ressize_check(rqstp, p);
 755 }
 756
 757 /* CREATE, MKDIR, SYMLINK, MKNOD */
 758 int
 759 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p)
 760 {
 761         struct nfsd3_diropres *resp = rqstp->rq_resp;
 762
 763         if (resp->status == 0) {
 764                 *p++ = xdr_one;
 765                 p = encode_fh(p, &resp->fh);
 766                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 767         }
 768         p = encode_wcc_data(rqstp, p, &resp->dirfh);
 769         return xdr_ressize_check(rqstp, p);
 770 }
 771
 772 /* RENAME */
 773 int
 774 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p)
 775 {
 776         struct nfsd3_renameres *resp = rqstp->rq_resp;
 777
 778         p = encode_wcc_data(rqstp, p, &resp->ffh);
 779         p = encode_wcc_data(rqstp, p, &resp->tfh);
 780         return xdr_ressize_check(rqstp, p);
 781 }
 782
 783 /* LINK */
 784 int
 785 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p)
 786 {
 787         struct nfsd3_linkres *resp = rqstp->rq_resp;
 788
 789         p = encode_post_op_attr(rqstp, p, &resp->fh);
 790         p = encode_wcc_data(rqstp, p, &resp->tfh);
 791         return xdr_ressize_check(rqstp, p);
 792 }
 793
 794 /* READDIR */
 795 int
 796 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
 797 {
 798         struct nfsd3_readdirres *resp = rqstp->rq_resp;
 799
 800         p = encode_post_op_attr(rqstp, p, &resp->fh);
 801
 802         if (resp->status == 0) {
 803                 /* stupid readdir cookie */
 804                 memcpy(p, resp->verf, 8); p += 2;
 805                 xdr_ressize_check(rqstp, p);
 806                 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
 807                         return 1; /*No room for trailer */
 808                 rqstp->rq_res.page_len = (resp->count) << 2;
 809
 810                 /* add the 'tail' to the end of the 'head' page - page 0. */
 811                 rqstp->rq_res.tail[0].iov_base = p;
 812                 *p++ = 0;               /* no more entries */
 813                 *p++ = htonl(resp->common.err == nfserr_eof);
 814                 rqstp->rq_res.tail[0].iov_len = 2<<2;
 815                 return 1;
 816         } else
 817                 return xdr_ressize_check(rqstp, p);
 818 }
 819
 820 static __be32 *
 821 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
 822              int namlen, u64 ino)
 823 {
 824         *p++ = xdr_one;                          /* mark entry present */
 825         p    = xdr_encode_hyper(p, ino);         /* file id */
 826         p    = xdr_encode_array(p, name, namlen);/* name length & name */
 827
 828         cd->offset = p;                         /* remember pointer */
 829         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
 830
 831         return p;
 832 }
 833
 834 static __be32
 835 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
 836                  const char *name, int namlen, u64 ino)
 837 {
 838         struct svc_export       *exp;
 839         struct dentry           *dparent, *dchild;
 840         __be32 rv = nfserr_noent;
 841
 842         dparent = cd->fh.fh_dentry;
 843         exp  = cd->fh.fh_export;
 844
 845         if (isdotent(name, namlen)) {
 846                 if (namlen == 2) {
 847                         dchild = dget_parent(dparent);
 848                         /* filesystem root - cannot return filehandle for ".." */
 849                         if (dchild == dparent)
 850                                 goto out;
 851                 } else
 852                         dchild = dget(dparent);
 853         } else
 854                 dchild = lookup_one_len_unlocked(name, dparent, namlen);
 855         if (IS_ERR(dchild))
 856                 return rv;
 857         if (d_mountpoint(dchild))
 858                 goto out;
 859         if (d_really_is_negative(dchild))
 860                 goto out;
 861         if (dchild->d_inode->i_ino != ino)
 862                 goto out;
 863         rv = fh_compose(fhp, exp, dchild, &cd->fh);
 864 out:
 865         dput(dchild);
 866         return rv;
 867 }
 868
 869 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
 870 {
 871         struct svc_fh   *fh = &cd->scratch;
 872         __be32 err;
 873
 874         fh_init(fh, NFS3_FHSIZE);
 875         err = compose_entry_fh(cd, fh, name, namlen, ino);
 876         if (err) {
 877                 *p++ = 0;
 878                 *p++ = 0;
 879                 goto out;
 880         }
 881         p = encode_post_op_attr(cd->rqstp, p, fh);
 882         *p++ = xdr_one;                 /* yes, a file handle follows */
 883         p = encode_fh(p, fh);
 884 out:
 885         fh_put(fh);
 886         return p;
 887 }
 888
 889 /*
 890  * Encode a directory entry. This one works for both normal readdir
 891  * and readdirplus.
 892  * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
 893  * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
 894  *
 895  * The readdirplus baggage is 1+21 words for post_op_attr, plus the
 896  * file handle.
 897  */
 898
 899 #define NFS3_ENTRY_BAGGAGE      (2 + 1 + 2 + 1)
 900 #define NFS3_ENTRYPLUS_BAGGAGE  (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
 901 static int
 902 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
 903              loff_t offset, u64 ino, unsigned int d_type, int plus)
 904 {
 905         struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
 906                                                         common);
 907         __be32          *p = cd->buffer;
 908         caddr_t         curr_page_addr = NULL;
 909         struct page **  page;
 910         int             slen;           /* string (name) length */
 911         int             elen;           /* estimated entry length in words */
 912         int             num_entry_words = 0;    /* actual number of words */
 913
 914         if (cd->offset) {
 915                 u64 offset64 = offset;
 916
 917                 if (unlikely(cd->offset1)) {
 918                         /* we ended up with offset on a page boundary */
 919                         *cd->offset = htonl(offset64 >> 32);
 920                         *cd->offset1 = htonl(offset64 & 0xffffffff);
 921                         cd->offset1 = NULL;
 922                 } else {
 923                         xdr_encode_hyper(cd->offset, offset64);
 924                 }
 925         }
 926
 927         /*
 928         dprintk("encode_entry(%.*s @%ld%s)\n",
 929                 namlen, name, (long) offset, plus? " plus" : "");
 930          */
 931
 932         /* truncate filename if too long */
 933         namlen = min(namlen, NFS3_MAXNAMLEN);
 934
 935         slen = XDR_QUADLEN(namlen);
 936         elen = slen + NFS3_ENTRY_BAGGAGE
 937                 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
 938
 939         if (cd->buflen < elen) {
 940                 cd->common.err = nfserr_toosmall;
 941                 return -EINVAL;
 942         }
 943
 944         /* determine which page in rq_respages[] we are currently filling */
 945         for (page = cd->rqstp->rq_respages + 1;
 946                                 page < cd->rqstp->rq_next_page; page++) {
 947                 curr_page_addr = page_address(*page);
 948
 949                 if (((caddr_t)cd->buffer >= curr_page_addr) &&
 950                     ((caddr_t)cd->buffer <  curr_page_addr + PAGE_SIZE))
 951                         break;
 952         }
 953
 954         if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
 955                 /* encode entry in current page */
 956
 957                 p = encode_entry_baggage(cd, p, name, namlen, ino);
 958
 959                 if (plus)
 960                         p = encode_entryplus_baggage(cd, p, name, namlen, ino);
 961                 num_entry_words = p - cd->buffer;
 962         } else if (*(page+1) != NULL) {
 963                 /* temporarily encode entry into next page, then move back to
 964                  * current and next page in rq_respages[] */
 965                 __be32 *p1, *tmp;
 966                 int len1, len2;
 967
 968                 /* grab next page for temporary storage of entry */
 969                 p1 = tmp = page_address(*(page+1));
 970
 971                 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
 972
 973                 if (plus)
 974                         p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
 975
 976                 /* determine entry word length and lengths to go in pages */
 977                 num_entry_words = p1 - tmp;
 978                 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
 979                 if ((num_entry_words << 2) < len1) {
 980                         /* the actual number of words in the entry is less
 981                          * than elen and can still fit in the current page
 982                          */
 983                         memmove(p, tmp, num_entry_words << 2);
 984                         p += num_entry_words;
 985
 986                         /* update offset */
 987                         cd->offset = cd->buffer + (cd->offset - tmp);
 988                 } else {
 989                         unsigned int offset_r = (cd->offset - tmp) << 2;
 990
 991                         /* update pointer to offset location.
 992                          * This is a 64bit quantity, so we need to
 993                          * deal with 3 cases:
 994                          *  -   entirely in first page
 995                          *  -   entirely in second page
 996                          *  -   4 bytes in each page
 997                          */
 998                         if (offset_r + 8 <= len1) {
 999                                 cd->offset = p + (cd->offset - tmp);
1000                         } else if (offset_r >= len1) {
1001                                 cd->offset -= len1 >> 2;
1002                         } else {
1003                                 /* sitting on the fence */
1004                                 BUG_ON(offset_r != len1 - 4);
1005                                 cd->offset = p + (cd->offset - tmp);
1006                                 cd->offset1 = tmp;
1007                         }
1008
1009                         len2 = (num_entry_words << 2) - len1;
1010
1011                         /* move from temp page to current and next pages */
1012                         memmove(p, tmp, len1);
1013                         memmove(tmp, (caddr_t)tmp+len1, len2);
1014
1015                         p = tmp + (len2 >> 2);
1016                 }
1017         }
1018         else {
1019                 cd->common.err = nfserr_toosmall;
1020                 return -EINVAL;
1021         }
1022
1023         cd->buflen -= num_entry_words;
1024         cd->buffer = p;
1025         cd->common.err = nfs_ok;
1026         return 0;
1027
1028 }
1029
1030 int
1031 nfs3svc_encode_entry(void *cd, const char *name,
1032                      int namlen, loff_t offset, u64 ino, unsigned int d_type)
1033 {
1034         return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1035 }
1036
1037 int
1038 nfs3svc_encode_entry_plus(void *cd, const char *name,
1039                           int namlen, loff_t offset, u64 ino,
1040                           unsigned int d_type)
1041 {
1042         return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1043 }
1044
1045 /* FSSTAT */
1046 int
1047 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p)
1048 {
1049         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
1050         struct kstatfs  *s = &resp->stats;
1051         u64             bs = s->f_bsize;
1052
1053         *p++ = xdr_zero;        /* no post_op_attr */
1054
1055         if (resp->status == 0) {
1056                 p = xdr_encode_hyper(p, bs * s->f_blocks);      /* total bytes */
1057                 p = xdr_encode_hyper(p, bs * s->f_bfree);       /* free bytes */
1058                 p = xdr_encode_hyper(p, bs * s->f_bavail);      /* user available bytes */
1059                 p = xdr_encode_hyper(p, s->f_files);    /* total inodes */
1060                 p = xdr_encode_hyper(p, s->f_ffree);    /* free inodes */
1061                 p = xdr_encode_hyper(p, s->f_ffree);    /* user available inodes */
1062                 *p++ = htonl(resp->invarsec);   /* mean unchanged time */
1063         }
1064         return xdr_ressize_check(rqstp, p);
1065 }
1066
1067 /* FSINFO */
1068 int
1069 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p)
1070 {
1071         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
1072
1073         *p++ = xdr_zero;        /* no post_op_attr */
1074
1075         if (resp->status == 0) {
1076                 *p++ = htonl(resp->f_rtmax);
1077                 *p++ = htonl(resp->f_rtpref);
1078                 *p++ = htonl(resp->f_rtmult);
1079                 *p++ = htonl(resp->f_wtmax);
1080                 *p++ = htonl(resp->f_wtpref);
1081                 *p++ = htonl(resp->f_wtmult);
1082                 *p++ = htonl(resp->f_dtpref);
1083                 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1084                 *p++ = xdr_one;
1085                 *p++ = xdr_zero;
1086                 *p++ = htonl(resp->f_properties);
1087         }
1088
1089         return xdr_ressize_check(rqstp, p);
1090 }
1091
1092 /* PATHCONF */
1093 int
1094 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p)
1095 {
1096         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
1097
1098         *p++ = xdr_zero;        /* no post_op_attr */
1099
1100         if (resp->status == 0) {
1101                 *p++ = htonl(resp->p_link_max);
1102                 *p++ = htonl(resp->p_name_max);
1103                 *p++ = htonl(resp->p_no_trunc);
1104                 *p++ = htonl(resp->p_chown_restricted);
1105                 *p++ = htonl(resp->p_case_insensitive);
1106                 *p++ = htonl(resp->p_case_preserving);
1107         }
1108
1109         return xdr_ressize_check(rqstp, p);
1110 }
1111
1112 /* COMMIT */
1113 int
1114 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
1115 {
1116         struct nfsd3_commitres *resp = rqstp->rq_resp;
1117         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1118
1119         p = encode_wcc_data(rqstp, p, &resp->fh);
1120         /* Write verifier */
1121         if (resp->status == 0) {
1122                 *p++ = htonl(nn->nfssvc_boot.tv_sec);
1123                 *p++ = htonl(nn->nfssvc_boot.tv_usec);
1124         }
1125         return xdr_ressize_check(rqstp, p);
1126 }
1127
1128 /*
1129  * XDR release functions
1130  */
1131 void
1132 nfs3svc_release_fhandle(struct svc_rqst *rqstp)
1133 {
1134         struct nfsd3_attrstat *resp = rqstp->rq_resp;
1135
1136         fh_put(&resp->fh);
1137 }
1138
1139 void
1140 nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
1141 {
1142         struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;
1143
1144         fh_put(&resp->fh1);
1145         fh_put(&resp->fh2);
1146 }