fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <[email protected]>
   8  *  Andy Adamson   <[email protected]>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 #include <linux/file.h>
  37 #include <linux/slab.h>
  38 #include <linux/namei.h>
  39 #include <linux/statfs.h>
  40 #include <linux/utsname.h>
  41 #include <linux/pagemap.h>
  42 #include <linux/sunrpc/svcauth_gss.h>
  43 #include <linux/sunrpc/addr.h>
  44 #include <linux/xattr.h>
  45 #include <linux/vmalloc.h>
  46
  47 #include <uapi/linux/xattr.h>
  48
  49 #include "idmap.h"
  50 #include "acl.h"
  51 #include "xdr4.h"
  52 #include "vfs.h"
  53 #include "state.h"
  54 #include "cache.h"
  55 #include "netns.h"
  56 #include "pnfs.h"
  57 #include "filecache.h"
  58
  59 #include "trace.h"
  60
  61 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  62 #include <linux/security.h>
  63 #endif
  64
  65
  66 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  67
  68 const u32 nfsd_suppattrs[3][3] = {
  69         {NFSD4_SUPPORTED_ATTRS_WORD0,
  70          NFSD4_SUPPORTED_ATTRS_WORD1,
  71          NFSD4_SUPPORTED_ATTRS_WORD2},
  72
  73         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  74          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  75          NFSD4_1_SUPPORTED_ATTRS_WORD2},
  76
  77         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  78          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  79          NFSD4_2_SUPPORTED_ATTRS_WORD2},
  80 };
  81
  82 /*
  83  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  84  * directory in order to indicate to the client that a filesystem boundary is present
  85  * We use a fixed fsid for a referral
  86  */
  87 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  88 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  89
  90 static __be32
  91 check_filename(char *str, int len)
  92 {
  93         int i;
  94
  95         if (len == 0)
  96                 return nfserr_inval;
  97         if (len > NFS4_MAXNAMLEN)
  98                 return nfserr_nametoolong;
  99         if (isdotent(str, len))
 100                 return nfserr_badname;
 101         for (i = 0; i < len; i++)
 102                 if (str[i] == '/')
 103                         return nfserr_badname;
 104         return 0;
 105 }
 106
 107 static int zero_clientid(clientid_t *clid)
 108 {
 109         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 110 }
 111
 112 /**
 113  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 114  * @argp: NFSv4 compound argument structure
 115  * @len: length of buffer to allocate
 116  *
 117  * Allocates a buffer of size @len to be freed when processing the compound
 118  * operation described in @argp finishes.
 119  */
 120 static void *
 121 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 122 {
 123         struct svcxdr_tmpbuf *tb;
 124
 125         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 126         if (!tb)
 127                 return NULL;
 128         tb->next = argp->to_free;
 129         argp->to_free = tb;
 130         return tb->buf;
 131 }
 132
 133 /*
 134  * For xdr strings that need to be passed to other kernel api's
 135  * as null-terminated strings.
 136  *
 137  * Note null-terminating in place usually isn't safe since the
 138  * buffer might end on a page boundary.
 139  */
 140 static char *
 141 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 142 {
 143         char *p = svcxdr_tmpalloc(argp, len + 1);
 144
 145         if (!p)
 146                 return NULL;
 147         memcpy(p, buf, len);
 148         p[len] = '\0';
 149         return p;
 150 }
 151
 152 static void *
 153 svcxdr_savemem(struct nfsd4_compoundargs *argp, __be32 *p, u32 len)
 154 {
 155         __be32 *tmp;
 156
 157         /*
 158          * The location of the decoded data item is stable,
 159          * so @p is OK to use. This is the common case.
 160          */
 161         if (p != argp->xdr->scratch.iov_base)
 162                 return p;
 163
 164         tmp = svcxdr_tmpalloc(argp, len);
 165         if (!tmp)
 166                 return NULL;
 167         memcpy(tmp, p, len);
 168         return tmp;
 169 }
 170
 171 /*
 172  * NFSv4 basic data type decoders
 173  */
 174
 175 /*
 176  * This helper handles variable-length opaques which belong to protocol
 177  * elements that this implementation does not support.
 178  */
 179 static __be32
 180 nfsd4_decode_ignored_string(struct nfsd4_compoundargs *argp, u32 maxlen)
 181 {
 182         u32 len;
 183
 184         if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
 185                 return nfserr_bad_xdr;
 186         if (maxlen && len > maxlen)
 187                 return nfserr_bad_xdr;
 188         if (!xdr_inline_decode(argp->xdr, len))
 189                 return nfserr_bad_xdr;
 190
 191         return nfs_ok;
 192 }
 193
 194 static __be32
 195 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 196 {
 197         __be32 *p;
 198         u32 len;
 199
 200         if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
 201                 return nfserr_bad_xdr;
 202         if (len == 0 || len > NFS4_OPAQUE_LIMIT)
 203                 return nfserr_bad_xdr;
 204         p = xdr_inline_decode(argp->xdr, len);
 205         if (!p)
 206                 return nfserr_bad_xdr;
 207         o->data = svcxdr_savemem(argp, p, len);
 208         if (!o->data)
 209                 return nfserr_jukebox;
 210         o->len = len;
 211
 212         return nfs_ok;
 213 }
 214
 215 static __be32
 216 nfsd4_decode_component4(struct nfsd4_compoundargs *argp, char **namp, u32 *lenp)
 217 {
 218         __be32 *p, status;
 219
 220         if (xdr_stream_decode_u32(argp->xdr, lenp) < 0)
 221                 return nfserr_bad_xdr;
 222         p = xdr_inline_decode(argp->xdr, *lenp);
 223         if (!p)
 224                 return nfserr_bad_xdr;
 225         status = check_filename((char *)p, *lenp);
 226         if (status)
 227                 return status;
 228         *namp = svcxdr_savemem(argp, p, *lenp);
 229         if (!*namp)
 230                 return nfserr_jukebox;
 231
 232         return nfs_ok;
 233 }
 234
 235 static __be32
 236 nfsd4_decode_nfstime4(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
 237 {
 238         __be32 *p;
 239
 240         p = xdr_inline_decode(argp->xdr, XDR_UNIT * 3);
 241         if (!p)
 242                 return nfserr_bad_xdr;
 243         p = xdr_decode_hyper(p, &tv->tv_sec);
 244         tv->tv_nsec = be32_to_cpup(p++);
 245         if (tv->tv_nsec >= (u32)1000000000)
 246                 return nfserr_inval;
 247         return nfs_ok;
 248 }
 249
 250 static __be32
 251 nfsd4_decode_verifier4(struct nfsd4_compoundargs *argp, nfs4_verifier *verf)
 252 {
 253         __be32 *p;
 254
 255         p = xdr_inline_decode(argp->xdr, NFS4_VERIFIER_SIZE);
 256         if (!p)
 257                 return nfserr_bad_xdr;
 258         memcpy(verf->data, p, sizeof(verf->data));
 259         return nfs_ok;
 260 }
 261
 262 /**
 263  * nfsd4_decode_bitmap4 - Decode an NFSv4 bitmap4
 264  * @argp: NFSv4 compound argument structure
 265  * @bmval: pointer to an array of u32's to decode into
 266  * @bmlen: size of the @bmval array
 267  *
 268  * The server needs to return nfs_ok rather than nfserr_bad_xdr when
 269  * encountering bitmaps containing bits it does not recognize. This
 270  * includes bits in bitmap words past WORDn, where WORDn is the last
 271  * bitmap WORD the implementation currently supports. Thus we are
 272  * careful here to simply ignore bits in bitmap words that this
 273  * implementation has yet to support explicitly.
 274  *
 275  * Return values:
 276  *   %nfs_ok: @bmval populated successfully
 277  *   %nfserr_bad_xdr: the encoded bitmap was invalid
 278  */
 279 static __be32
 280 nfsd4_decode_bitmap4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen)
 281 {
 282         ssize_t status;
 283
 284         status = xdr_stream_decode_uint32_array(argp->xdr, bmval, bmlen);
 285         return status == -EBADMSG ? nfserr_bad_xdr : nfs_ok;
 286 }
 287
 288 static __be32
 289 nfsd4_decode_nfsace4(struct nfsd4_compoundargs *argp, struct nfs4_ace *ace)
 290 {
 291         __be32 *p, status;
 292         u32 length;
 293
 294         if (xdr_stream_decode_u32(argp->xdr, &ace->type) < 0)
 295                 return nfserr_bad_xdr;
 296         if (xdr_stream_decode_u32(argp->xdr, &ace->flag) < 0)
 297                 return nfserr_bad_xdr;
 298         if (xdr_stream_decode_u32(argp->xdr, &ace->access_mask) < 0)
 299                 return nfserr_bad_xdr;
 300
 301         if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
 302                 return nfserr_bad_xdr;
 303         p = xdr_inline_decode(argp->xdr, length);
 304         if (!p)
 305                 return nfserr_bad_xdr;
 306         ace->whotype = nfs4_acl_get_whotype((char *)p, length);
 307         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 308                 status = nfs_ok;
 309         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 310                 status = nfsd_map_name_to_gid(argp->rqstp,
 311                                 (char *)p, length, &ace->who_gid);
 312         else
 313                 status = nfsd_map_name_to_uid(argp->rqstp,
 314                                 (char *)p, length, &ace->who_uid);
 315
 316         return status;
 317 }
 318
 319 /* A counted array of nfsace4's */
 320 static noinline __be32
 321 nfsd4_decode_acl(struct nfsd4_compoundargs *argp, struct nfs4_acl **acl)
 322 {
 323         struct nfs4_ace *ace;
 324         __be32 status;
 325         u32 count;
 326
 327         if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
 328                 return nfserr_bad_xdr;
 329
 330         if (count > xdr_stream_remaining(argp->xdr) / 20)
 331                 /*
 332                  * Even with 4-byte names there wouldn't be
 333                  * space for that many aces; something fishy is
 334                  * going on:
 335                  */
 336                 return nfserr_fbig;
 337
 338         *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(count));
 339         if (*acl == NULL)
 340                 return nfserr_jukebox;
 341
 342         (*acl)->naces = count;
 343         for (ace = (*acl)->aces; ace < (*acl)->aces + count; ace++) {
 344                 status = nfsd4_decode_nfsace4(argp, ace);
 345                 if (status)
 346                         return status;
 347         }
 348
 349         return nfs_ok;
 350 }
 351
 352 static noinline __be32
 353 nfsd4_decode_security_label(struct nfsd4_compoundargs *argp,
 354                             struct xdr_netobj *label)
 355 {
 356         u32 lfs, pi, length;
 357         __be32 *p;
 358
 359         if (xdr_stream_decode_u32(argp->xdr, &lfs) < 0)
 360                 return nfserr_bad_xdr;
 361         if (xdr_stream_decode_u32(argp->xdr, &pi) < 0)
 362                 return nfserr_bad_xdr;
 363
 364         if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
 365                 return nfserr_bad_xdr;
 366         if (length > NFS4_MAXLABELLEN)
 367                 return nfserr_badlabel;
 368         p = xdr_inline_decode(argp->xdr, length);
 369         if (!p)
 370                 return nfserr_bad_xdr;
 371         label->len = length;
 372         label->data = svcxdr_dupstr(argp, p, length);
 373         if (!label->data)
 374                 return nfserr_jukebox;
 375
 376         return nfs_ok;
 377 }
 378
 379 static __be32
 380 nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen,
 381                     struct iattr *iattr, struct nfs4_acl **acl,
 382                     struct xdr_netobj *label, int *umask)
 383 {
 384         unsigned int starting_pos;
 385         u32 attrlist4_count;
 386         __be32 *p, status;
 387
 388         iattr->ia_valid = 0;
 389         status = nfsd4_decode_bitmap4(argp, bmval, bmlen);
 390         if (status)
 391                 return nfserr_bad_xdr;
 392
 393         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 394             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 395             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
 396                 if (nfsd_attrs_supported(argp->minorversion, bmval))
 397                         return nfserr_inval;
 398                 return nfserr_attrnotsupp;
 399         }
 400
 401         if (xdr_stream_decode_u32(argp->xdr, &attrlist4_count) < 0)
 402                 return nfserr_bad_xdr;
 403         starting_pos = xdr_stream_pos(argp->xdr);
 404
 405         if (bmval[0] & FATTR4_WORD0_SIZE) {
 406                 u64 size;
 407
 408                 if (xdr_stream_decode_u64(argp->xdr, &size) < 0)
 409                         return nfserr_bad_xdr;
 410                 iattr->ia_size = size;
 411                 iattr->ia_valid |= ATTR_SIZE;
 412         }
 413         if (bmval[0] & FATTR4_WORD0_ACL) {
 414                 status = nfsd4_decode_acl(argp, acl);
 415                 if (status)
 416                         return status;
 417         } else
 418                 *acl = NULL;
 419         if (bmval[1] & FATTR4_WORD1_MODE) {
 420                 u32 mode;
 421
 422                 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
 423                         return nfserr_bad_xdr;
 424                 iattr->ia_mode = mode;
 425                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 426                 iattr->ia_valid |= ATTR_MODE;
 427         }
 428         if (bmval[1] & FATTR4_WORD1_OWNER) {
 429                 u32 length;
 430
 431                 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
 432                         return nfserr_bad_xdr;
 433                 p = xdr_inline_decode(argp->xdr, length);
 434                 if (!p)
 435                         return nfserr_bad_xdr;
 436                 status = nfsd_map_name_to_uid(argp->rqstp, (char *)p, length,
 437                                               &iattr->ia_uid);
 438                 if (status)
 439                         return status;
 440                 iattr->ia_valid |= ATTR_UID;
 441         }
 442         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 443                 u32 length;
 444
 445                 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
 446                         return nfserr_bad_xdr;
 447                 p = xdr_inline_decode(argp->xdr, length);
 448                 if (!p)
 449                         return nfserr_bad_xdr;
 450                 status = nfsd_map_name_to_gid(argp->rqstp, (char *)p, length,
 451                                               &iattr->ia_gid);
 452                 if (status)
 453                         return status;
 454                 iattr->ia_valid |= ATTR_GID;
 455         }
 456         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 457                 u32 set_it;
 458
 459                 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
 460                         return nfserr_bad_xdr;
 461                 switch (set_it) {
 462                 case NFS4_SET_TO_CLIENT_TIME:
 463                         status = nfsd4_decode_nfstime4(argp, &iattr->ia_atime);
 464                         if (status)
 465                                 return status;
 466                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 467                         break;
 468                 case NFS4_SET_TO_SERVER_TIME:
 469                         iattr->ia_valid |= ATTR_ATIME;
 470                         break;
 471                 default:
 472                         return nfserr_bad_xdr;
 473                 }
 474         }
 475         if (bmval[1] & FATTR4_WORD1_TIME_CREATE) {
 476                 struct timespec64 ts;
 477
 478                 /* No Linux filesystem supports setting this attribute. */
 479                 bmval[1] &= ~FATTR4_WORD1_TIME_CREATE;
 480                 status = nfsd4_decode_nfstime4(argp, &ts);
 481                 if (status)
 482                         return status;
 483         }
 484         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 485                 u32 set_it;
 486
 487                 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
 488                         return nfserr_bad_xdr;
 489                 switch (set_it) {
 490                 case NFS4_SET_TO_CLIENT_TIME:
 491                         status = nfsd4_decode_nfstime4(argp, &iattr->ia_mtime);
 492                         if (status)
 493                                 return status;
 494                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 495                         break;
 496                 case NFS4_SET_TO_SERVER_TIME:
 497                         iattr->ia_valid |= ATTR_MTIME;
 498                         break;
 499                 default:
 500                         return nfserr_bad_xdr;
 501                 }
 502         }
 503         label->len = 0;
 504         if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
 505             bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 506                 status = nfsd4_decode_security_label(argp, label);
 507                 if (status)
 508                         return status;
 509         }
 510         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
 511                 u32 mode, mask;
 512
 513                 if (!umask)
 514                         return nfserr_bad_xdr;
 515                 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
 516                         return nfserr_bad_xdr;
 517                 iattr->ia_mode = mode & (S_IFMT | S_IALLUGO);
 518                 if (xdr_stream_decode_u32(argp->xdr, &mask) < 0)
 519                         return nfserr_bad_xdr;
 520                 *umask = mask & S_IRWXUGO;
 521                 iattr->ia_valid |= ATTR_MODE;
 522         }
 523
 524         /* request sanity: did attrlist4 contain the expected number of words? */
 525         if (attrlist4_count != xdr_stream_pos(argp->xdr) - starting_pos)
 526                 return nfserr_bad_xdr;
 527
 528         return nfs_ok;
 529 }
 530
 531 static __be32
 532 nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid)
 533 {
 534         __be32 *p;
 535
 536         p = xdr_inline_decode(argp->xdr, NFS4_STATEID_SIZE);
 537         if (!p)
 538                 return nfserr_bad_xdr;
 539         sid->si_generation = be32_to_cpup(p++);
 540         memcpy(&sid->si_opaque, p, sizeof(sid->si_opaque));
 541         return nfs_ok;
 542 }
 543
 544 static __be32
 545 nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 546 {
 547         __be32 *p;
 548
 549         p = xdr_inline_decode(argp->xdr, sizeof(__be64));
 550         if (!p)
 551                 return nfserr_bad_xdr;
 552         memcpy(clientid, p, sizeof(*clientid));
 553         return nfs_ok;
 554 }
 555
 556 static __be32
 557 nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp,
 558                           clientid_t *clientid, struct xdr_netobj *owner)
 559 {
 560         __be32 status;
 561
 562         status = nfsd4_decode_clientid4(argp, clientid);
 563         if (status)
 564                 return status;
 565         return nfsd4_decode_opaque(argp, owner);
 566 }
 567
 568 #ifdef CONFIG_NFSD_PNFS
 569 static __be32
 570 nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp,
 571                        struct nfsd4_deviceid *devid)
 572 {
 573         __be32 *p;
 574
 575         p = xdr_inline_decode(argp->xdr, NFS4_DEVICEID4_SIZE);
 576         if (!p)
 577                 return nfserr_bad_xdr;
 578         memcpy(devid, p, sizeof(*devid));
 579         return nfs_ok;
 580 }
 581
 582 static __be32
 583 nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs *argp,
 584                            struct nfsd4_layoutcommit *lcp)
 585 {
 586         if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_layout_type) < 0)
 587                 return nfserr_bad_xdr;
 588         if (lcp->lc_layout_type < LAYOUT_NFSV4_1_FILES)
 589                 return nfserr_bad_xdr;
 590         if (lcp->lc_layout_type >= LAYOUT_TYPE_MAX)
 591                 return nfserr_bad_xdr;
 592
 593         if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_up_len) < 0)
 594                 return nfserr_bad_xdr;
 595         if (lcp->lc_up_len > 0) {
 596                 lcp->lc_up_layout = xdr_inline_decode(argp->xdr, lcp->lc_up_len);
 597                 if (!lcp->lc_up_layout)
 598                         return nfserr_bad_xdr;
 599         }
 600
 601         return nfs_ok;
 602 }
 603
 604 static __be32
 605 nfsd4_decode_layoutreturn4(struct nfsd4_compoundargs *argp,
 606                            struct nfsd4_layoutreturn *lrp)
 607 {
 608         __be32 status;
 609
 610         if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_return_type) < 0)
 611                 return nfserr_bad_xdr;
 612         switch (lrp->lr_return_type) {
 613         case RETURN_FILE:
 614                 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.offset) < 0)
 615                         return nfserr_bad_xdr;
 616                 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.length) < 0)
 617                         return nfserr_bad_xdr;
 618                 status = nfsd4_decode_stateid4(argp, &lrp->lr_sid);
 619                 if (status)
 620                         return status;
 621                 if (xdr_stream_decode_u32(argp->xdr, &lrp->lrf_body_len) < 0)
 622                         return nfserr_bad_xdr;
 623                 if (lrp->lrf_body_len > 0) {
 624                         lrp->lrf_body = xdr_inline_decode(argp->xdr, lrp->lrf_body_len);
 625                         if (!lrp->lrf_body)
 626                                 return nfserr_bad_xdr;
 627                 }
 628                 break;
 629         case RETURN_FSID:
 630         case RETURN_ALL:
 631                 lrp->lr_seg.offset = 0;
 632                 lrp->lr_seg.length = NFS4_MAX_UINT64;
 633                 break;
 634         default:
 635                 return nfserr_bad_xdr;
 636         }
 637
 638         return nfs_ok;
 639 }
 640
 641 #endif /* CONFIG_NFSD_PNFS */
 642
 643 static __be32
 644 nfsd4_decode_sessionid4(struct nfsd4_compoundargs *argp,
 645                         struct nfs4_sessionid *sessionid)
 646 {
 647         __be32 *p;
 648
 649         p = xdr_inline_decode(argp->xdr, NFS4_MAX_SESSIONID_LEN);
 650         if (!p)
 651                 return nfserr_bad_xdr;
 652         memcpy(sessionid->data, p, sizeof(sessionid->data));
 653         return nfs_ok;
 654 }
 655
 656 /* Defined in Appendix A of RFC 5531 */
 657 static __be32
 658 nfsd4_decode_authsys_parms(struct nfsd4_compoundargs *argp,
 659                            struct nfsd4_cb_sec *cbs)
 660 {
 661         u32 stamp, gidcount, uid, gid;
 662         __be32 *p, status;
 663
 664         if (xdr_stream_decode_u32(argp->xdr, &stamp) < 0)
 665                 return nfserr_bad_xdr;
 666         /* machine name */
 667         status = nfsd4_decode_ignored_string(argp, 255);
 668         if (status)
 669                 return status;
 670         if (xdr_stream_decode_u32(argp->xdr, &uid) < 0)
 671                 return nfserr_bad_xdr;
 672         if (xdr_stream_decode_u32(argp->xdr, &gid) < 0)
 673                 return nfserr_bad_xdr;
 674         if (xdr_stream_decode_u32(argp->xdr, &gidcount) < 0)
 675                 return nfserr_bad_xdr;
 676         if (gidcount > 16)
 677                 return nfserr_bad_xdr;
 678         p = xdr_inline_decode(argp->xdr, gidcount << 2);
 679         if (!p)
 680                 return nfserr_bad_xdr;
 681         if (cbs->flavor == (u32)(-1)) {
 682                 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
 683
 684                 kuid_t kuid = make_kuid(userns, uid);
 685                 kgid_t kgid = make_kgid(userns, gid);
 686                 if (uid_valid(kuid) && gid_valid(kgid)) {
 687                         cbs->uid = kuid;
 688                         cbs->gid = kgid;
 689                         cbs->flavor = RPC_AUTH_UNIX;
 690                 } else {
 691                         dprintk("RPC_AUTH_UNIX with invalid uid or gid, ignoring!\n");
 692                 }
 693         }
 694
 695         return nfs_ok;
 696 }
 697
 698 static __be32
 699 nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs *argp,
 700                              struct nfsd4_cb_sec *cbs)
 701 {
 702         __be32 status;
 703         u32 service;
 704
 705         dprintk("RPC_AUTH_GSS callback secflavor not supported!\n");
 706
 707         if (xdr_stream_decode_u32(argp->xdr, &service) < 0)
 708                 return nfserr_bad_xdr;
 709         if (service < RPC_GSS_SVC_NONE || service > RPC_GSS_SVC_PRIVACY)
 710                 return nfserr_bad_xdr;
 711         /* gcbp_handle_from_server */
 712         status = nfsd4_decode_ignored_string(argp, 0);
 713         if (status)
 714                 return status;
 715         /* gcbp_handle_from_client */
 716         status = nfsd4_decode_ignored_string(argp, 0);
 717         if (status)
 718                 return status;
 719
 720         return nfs_ok;
 721 }
 722
 723 /* a counted array of callback_sec_parms4 items */
 724 static __be32
 725 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 726 {
 727         u32 i, secflavor, nr_secflavs;
 728         __be32 status;
 729
 730         /* callback_sec_params4 */
 731         if (xdr_stream_decode_u32(argp->xdr, &nr_secflavs) < 0)
 732                 return nfserr_bad_xdr;
 733         if (nr_secflavs)
 734                 cbs->flavor = (u32)(-1);
 735         else
 736                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 737                 cbs->flavor = 0;
 738
 739         for (i = 0; i < nr_secflavs; ++i) {
 740                 if (xdr_stream_decode_u32(argp->xdr, &secflavor) < 0)
 741                         return nfserr_bad_xdr;
 742                 switch (secflavor) {
 743                 case RPC_AUTH_NULL:
 744                         /* void */
 745                         if (cbs->flavor == (u32)(-1))
 746                                 cbs->flavor = RPC_AUTH_NULL;
 747                         break;
 748                 case RPC_AUTH_UNIX:
 749                         status = nfsd4_decode_authsys_parms(argp, cbs);
 750                         if (status)
 751                                 return status;
 752                         break;
 753                 case RPC_AUTH_GSS:
 754                         status = nfsd4_decode_gss_cb_handles4(argp, cbs);
 755                         if (status)
 756                                 return status;
 757                         break;
 758                 default:
 759                         return nfserr_inval;
 760                 }
 761         }
 762
 763         return nfs_ok;
 764 }
 765
 766
 767 /*
 768  * NFSv4 operation argument decoders
 769  */
 770
 771 static __be32
 772 nfsd4_decode_access(struct nfsd4_compoundargs *argp,
 773                     struct nfsd4_access *access)
 774 {
 775         if (xdr_stream_decode_u32(argp->xdr, &access->ac_req_access) < 0)
 776                 return nfserr_bad_xdr;
 777         return nfs_ok;
 778 }
 779
 780 static __be32
 781 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 782 {
 783         if (xdr_stream_decode_u32(argp->xdr, &close->cl_seqid) < 0)
 784                 return nfserr_bad_xdr;
 785         return nfsd4_decode_stateid4(argp, &close->cl_stateid);
 786 }
 787
 788
 789 static __be32
 790 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 791 {
 792         if (xdr_stream_decode_u64(argp->xdr, &commit->co_offset) < 0)
 793                 return nfserr_bad_xdr;
 794         if (xdr_stream_decode_u32(argp->xdr, &commit->co_count) < 0)
 795                 return nfserr_bad_xdr;
 796         memset(&commit->co_verf, 0, sizeof(commit->co_verf));
 797         return nfs_ok;
 798 }
 799
 800 static __be32
 801 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 802 {
 803         __be32 *p, status;
 804
 805         memset(create, 0, sizeof(*create));
 806         if (xdr_stream_decode_u32(argp->xdr, &create->cr_type) < 0)
 807                 return nfserr_bad_xdr;
 808         switch (create->cr_type) {
 809         case NF4LNK:
 810                 if (xdr_stream_decode_u32(argp->xdr, &create->cr_datalen) < 0)
 811                         return nfserr_bad_xdr;
 812                 p = xdr_inline_decode(argp->xdr, create->cr_datalen);
 813                 if (!p)
 814                         return nfserr_bad_xdr;
 815                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 816                 if (!create->cr_data)
 817                         return nfserr_jukebox;
 818                 break;
 819         case NF4BLK:
 820         case NF4CHR:
 821                 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata1) < 0)
 822                         return nfserr_bad_xdr;
 823                 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata2) < 0)
 824                         return nfserr_bad_xdr;
 825                 break;
 826         case NF4SOCK:
 827         case NF4FIFO:
 828         case NF4DIR:
 829         default:
 830                 break;
 831         }
 832         status = nfsd4_decode_component4(argp, &create->cr_name,
 833                                          &create->cr_namelen);
 834         if (status)
 835                 return status;
 836         status = nfsd4_decode_fattr4(argp, create->cr_bmval,
 837                                     ARRAY_SIZE(create->cr_bmval),
 838                                     &create->cr_iattr, &create->cr_acl,
 839                                     &create->cr_label, &create->cr_umask);
 840         if (status)
 841                 return status;
 842
 843         return nfs_ok;
 844 }
 845
 846 static inline __be32
 847 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 848 {
 849         return nfsd4_decode_stateid4(argp, &dr->dr_stateid);
 850 }
 851
 852 static inline __be32
 853 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 854 {
 855         memset(getattr, 0, sizeof(*getattr));
 856         return nfsd4_decode_bitmap4(argp, getattr->ga_bmval,
 857                                     ARRAY_SIZE(getattr->ga_bmval));
 858 }
 859
 860 static __be32
 861 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 862 {
 863         memset(link, 0, sizeof(*link));
 864         return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen);
 865 }
 866
 867 static __be32
 868 nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp,
 869                                  struct nfsd4_lock *lock)
 870 {
 871         __be32 status;
 872
 873         if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0)
 874                 return nfserr_bad_xdr;
 875         status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid);
 876         if (status)
 877                 return status;
 878         if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0)
 879                 return nfserr_bad_xdr;
 880         return nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid,
 881                                          &lock->lk_new_owner);
 882 }
 883
 884 static __be32
 885 nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp,
 886                                struct nfsd4_lock *lock)
 887 {
 888         __be32 status;
 889
 890         status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid);
 891         if (status)
 892                 return status;
 893         if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0)
 894                 return nfserr_bad_xdr;
 895
 896         return nfs_ok;
 897 }
 898
 899 static __be32
 900 nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 901 {
 902         if (xdr_stream_decode_bool(argp->xdr, &lock->lk_is_new) < 0)
 903                 return nfserr_bad_xdr;
 904         if (lock->lk_is_new)
 905                 return nfsd4_decode_open_to_lock_owner4(argp, lock);
 906         return nfsd4_decode_exist_lock_owner4(argp, lock);
 907 }
 908
 909 static __be32
 910 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 911 {
 912         memset(lock, 0, sizeof(*lock));
 913         if (xdr_stream_decode_u32(argp->xdr, &lock->lk_type) < 0)
 914                 return nfserr_bad_xdr;
 915         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 916                 return nfserr_bad_xdr;
 917         if (xdr_stream_decode_bool(argp->xdr, &lock->lk_reclaim) < 0)
 918                 return nfserr_bad_xdr;
 919         if (xdr_stream_decode_u64(argp->xdr, &lock->lk_offset) < 0)
 920                 return nfserr_bad_xdr;
 921         if (xdr_stream_decode_u64(argp->xdr, &lock->lk_length) < 0)
 922                 return nfserr_bad_xdr;
 923         return nfsd4_decode_locker4(argp, lock);
 924 }
 925
 926 static __be32
 927 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 928 {
 929         memset(lockt, 0, sizeof(*lockt));
 930         if (xdr_stream_decode_u32(argp->xdr, &lockt->lt_type) < 0)
 931                 return nfserr_bad_xdr;
 932         if ((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 933                 return nfserr_bad_xdr;
 934         if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_offset) < 0)
 935                 return nfserr_bad_xdr;
 936         if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_length) < 0)
 937                 return nfserr_bad_xdr;
 938         return nfsd4_decode_state_owner4(argp, &lockt->lt_clientid,
 939                                          &lockt->lt_owner);
 940 }
 941
 942 static __be32
 943 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 944 {
 945         __be32 status;
 946
 947         if (xdr_stream_decode_u32(argp->xdr, &locku->lu_type) < 0)
 948                 return nfserr_bad_xdr;
 949         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 950                 return nfserr_bad_xdr;
 951         if (xdr_stream_decode_u32(argp->xdr, &locku->lu_seqid) < 0)
 952                 return nfserr_bad_xdr;
 953         status = nfsd4_decode_stateid4(argp, &locku->lu_stateid);
 954         if (status)
 955                 return status;
 956         if (xdr_stream_decode_u64(argp->xdr, &locku->lu_offset) < 0)
 957                 return nfserr_bad_xdr;
 958         if (xdr_stream_decode_u64(argp->xdr, &locku->lu_length) < 0)
 959                 return nfserr_bad_xdr;
 960
 961         return nfs_ok;
 962 }
 963
 964 static __be32
 965 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 966 {
 967         return nfsd4_decode_component4(argp, &lookup->lo_name, &lookup->lo_len);
 968 }
 969
 970 static __be32
 971 nfsd4_decode_createhow4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 972 {
 973         __be32 status;
 974
 975         if (xdr_stream_decode_u32(argp->xdr, &open->op_createmode) < 0)
 976                 return nfserr_bad_xdr;
 977         switch (open->op_createmode) {
 978         case NFS4_CREATE_UNCHECKED:
 979         case NFS4_CREATE_GUARDED:
 980                 status = nfsd4_decode_fattr4(argp, open->op_bmval,
 981                                              ARRAY_SIZE(open->op_bmval),
 982                                              &open->op_iattr, &open->op_acl,
 983                                              &open->op_label, &open->op_umask);
 984                 if (status)
 985                         return status;
 986                 break;
 987         case NFS4_CREATE_EXCLUSIVE:
 988                 status = nfsd4_decode_verifier4(argp, &open->op_verf);
 989                 if (status)
 990                         return status;
 991                 break;
 992         case NFS4_CREATE_EXCLUSIVE4_1:
 993                 if (argp->minorversion < 1)
 994                         return nfserr_bad_xdr;
 995                 status = nfsd4_decode_verifier4(argp, &open->op_verf);
 996                 if (status)
 997                         return status;
 998                 status = nfsd4_decode_fattr4(argp, open->op_bmval,
 999                                              ARRAY_SIZE(open->op_bmval),
1000                                              &open->op_iattr, &open->op_acl,
1001                                              &open->op_label, &open->op_umask);
1002                 if (status)
1003                         return status;
1004                 break;
1005         default:
1006                 return nfserr_bad_xdr;
1007         }
1008
1009         return nfs_ok;
1010 }
1011
1012 static __be32
1013 nfsd4_decode_openflag4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
1014 {
1015         __be32 status;
1016
1017         if (xdr_stream_decode_u32(argp->xdr, &open->op_create) < 0)
1018                 return nfserr_bad_xdr;
1019         switch (open->op_create) {
1020         case NFS4_OPEN_NOCREATE:
1021                 break;
1022         case NFS4_OPEN_CREATE:
1023                 status = nfsd4_decode_createhow4(argp, open);
1024                 if (status)
1025                         return status;
1026                 break;
1027         default:
1028                 return nfserr_bad_xdr;
1029         }
1030
1031         return nfs_ok;
1032 }
1033
1034 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
1035 {
1036         u32 w;
1037
1038         if (xdr_stream_decode_u32(argp->xdr, &w) < 0)
1039                 return nfserr_bad_xdr;
1040         *share_access = w & NFS4_SHARE_ACCESS_MASK;
1041         *deleg_want = w & NFS4_SHARE_WANT_MASK;
1042         if (deleg_when)
1043                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
1044
1045         switch (w & NFS4_SHARE_ACCESS_MASK) {
1046         case NFS4_SHARE_ACCESS_READ:
1047         case NFS4_SHARE_ACCESS_WRITE:
1048         case NFS4_SHARE_ACCESS_BOTH:
1049                 break;
1050         default:
1051                 return nfserr_bad_xdr;
1052         }
1053         w &= ~NFS4_SHARE_ACCESS_MASK;
1054         if (!w)
1055                 return nfs_ok;
1056         if (!argp->minorversion)
1057                 return nfserr_bad_xdr;
1058         switch (w & NFS4_SHARE_WANT_MASK) {
1059         case NFS4_SHARE_WANT_NO_PREFERENCE:
1060         case NFS4_SHARE_WANT_READ_DELEG:
1061         case NFS4_SHARE_WANT_WRITE_DELEG:
1062         case NFS4_SHARE_WANT_ANY_DELEG:
1063         case NFS4_SHARE_WANT_NO_DELEG:
1064         case NFS4_SHARE_WANT_CANCEL:
1065                 break;
1066         default:
1067                 return nfserr_bad_xdr;
1068         }
1069         w &= ~NFS4_SHARE_WANT_MASK;
1070         if (!w)
1071                 return nfs_ok;
1072
1073         if (!deleg_when)        /* open_downgrade */
1074                 return nfserr_inval;
1075         switch (w) {
1076         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
1077         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
1078         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
1079               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
1080                 return nfs_ok;
1081         }
1082         return nfserr_bad_xdr;
1083 }
1084
1085 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
1086 {
1087         if (xdr_stream_decode_u32(argp->xdr, x) < 0)
1088                 return nfserr_bad_xdr;
1089         /* Note: unlike access bits, deny bits may be zero. */
1090         if (*x & ~NFS4_SHARE_DENY_BOTH)
1091                 return nfserr_bad_xdr;
1092
1093         return nfs_ok;
1094 }
1095
1096 static __be32
1097 nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp,
1098                          struct nfsd4_open *open)
1099 {
1100         __be32 status;
1101
1102         if (xdr_stream_decode_u32(argp->xdr, &open->op_claim_type) < 0)
1103                 return nfserr_bad_xdr;
1104         switch (open->op_claim_type) {
1105         case NFS4_OPEN_CLAIM_NULL:
1106         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1107                 status = nfsd4_decode_component4(argp, &open->op_fname,
1108                                                  &open->op_fnamelen);
1109                 if (status)
1110                         return status;
1111                 break;
1112         case NFS4_OPEN_CLAIM_PREVIOUS:
1113                 if (xdr_stream_decode_u32(argp->xdr, &open->op_delegate_type) < 0)
1114                         return nfserr_bad_xdr;
1115                 break;
1116         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1117                 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1118                 if (status)
1119                         return status;
1120                 status = nfsd4_decode_component4(argp, &open->op_fname,
1121                                                  &open->op_fnamelen);
1122                 if (status)
1123                         return status;
1124                 break;
1125         case NFS4_OPEN_CLAIM_FH:
1126         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1127                 if (argp->minorversion < 1)
1128                         return nfserr_bad_xdr;
1129                 /* void */
1130                 break;
1131         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1132                 if (argp->minorversion < 1)
1133                         return nfserr_bad_xdr;
1134                 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1135                 if (status)
1136                         return status;
1137                 break;
1138         default:
1139                 return nfserr_bad_xdr;
1140         }
1141
1142         return nfs_ok;
1143 }
1144
1145 static __be32
1146 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
1147 {
1148         __be32 status;
1149         u32 dummy;
1150
1151         memset(open, 0, sizeof(*open));
1152
1153         if (xdr_stream_decode_u32(argp->xdr, &open->op_seqid) < 0)
1154                 return nfserr_bad_xdr;
1155         /* deleg_want is ignored */
1156         status = nfsd4_decode_share_access(argp, &open->op_share_access,
1157                                            &open->op_deleg_want, &dummy);
1158         if (status)
1159                 return status;
1160         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
1161         if (status)
1162                 return status;
1163         status = nfsd4_decode_state_owner4(argp, &open->op_clientid,
1164                                            &open->op_owner);
1165         if (status)
1166                 return status;
1167         status = nfsd4_decode_openflag4(argp, open);
1168         if (status)
1169                 return status;
1170         return nfsd4_decode_open_claim4(argp, open);
1171 }
1172
1173 static __be32
1174 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1175 {
1176         __be32 status;
1177
1178         if (argp->minorversion >= 1)
1179                 return nfserr_notsupp;
1180
1181         status = nfsd4_decode_stateid4(argp, &open_conf->oc_req_stateid);
1182         if (status)
1183                 return status;
1184         if (xdr_stream_decode_u32(argp->xdr, &open_conf->oc_seqid) < 0)
1185                 return nfserr_bad_xdr;
1186
1187         memset(&open_conf->oc_resp_stateid, 0,
1188                sizeof(open_conf->oc_resp_stateid));
1189         return nfs_ok;
1190 }
1191
1192 static __be32
1193 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1194 {
1195         __be32 status;
1196
1197         memset(open_down, 0, sizeof(*open_down));
1198         status = nfsd4_decode_stateid4(argp, &open_down->od_stateid);
1199         if (status)
1200                 return status;
1201         if (xdr_stream_decode_u32(argp->xdr, &open_down->od_seqid) < 0)
1202                 return nfserr_bad_xdr;
1203         /* deleg_want is ignored */
1204         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1205                                            &open_down->od_deleg_want, NULL);
1206         if (status)
1207                 return status;
1208         return nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1209 }
1210
1211 static __be32
1212 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1213 {
1214         __be32 *p;
1215
1216         if (xdr_stream_decode_u32(argp->xdr, &putfh->pf_fhlen) < 0)
1217                 return nfserr_bad_xdr;
1218         if (putfh->pf_fhlen > NFS4_FHSIZE)
1219                 return nfserr_bad_xdr;
1220         p = xdr_inline_decode(argp->xdr, putfh->pf_fhlen);
1221         if (!p)
1222                 return nfserr_bad_xdr;
1223         putfh->pf_fhval = svcxdr_savemem(argp, p, putfh->pf_fhlen);
1224         if (!putfh->pf_fhval)
1225                 return nfserr_jukebox;
1226
1227         putfh->no_verify = false;
1228         return nfs_ok;
1229 }
1230
1231 static __be32
1232 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1233 {
1234         if (argp->minorversion == 0)
1235                 return nfs_ok;
1236         return nfserr_notsupp;
1237 }
1238
1239 static __be32
1240 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1241 {
1242         __be32 status;
1243
1244         memset(read, 0, sizeof(*read));
1245         status = nfsd4_decode_stateid4(argp, &read->rd_stateid);
1246         if (status)
1247                 return status;
1248         if (xdr_stream_decode_u64(argp->xdr, &read->rd_offset) < 0)
1249                 return nfserr_bad_xdr;
1250         if (xdr_stream_decode_u32(argp->xdr, &read->rd_length) < 0)
1251                 return nfserr_bad_xdr;
1252
1253         return nfs_ok;
1254 }
1255
1256 static __be32
1257 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1258 {
1259         __be32 status;
1260
1261         memset(readdir, 0, sizeof(*readdir));
1262         if (xdr_stream_decode_u64(argp->xdr, &readdir->rd_cookie) < 0)
1263                 return nfserr_bad_xdr;
1264         status = nfsd4_decode_verifier4(argp, &readdir->rd_verf);
1265         if (status)
1266                 return status;
1267         if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_dircount) < 0)
1268                 return nfserr_bad_xdr;
1269         if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_maxcount) < 0)
1270                 return nfserr_bad_xdr;
1271         if (xdr_stream_decode_uint32_array(argp->xdr, readdir->rd_bmval,
1272                                            ARRAY_SIZE(readdir->rd_bmval)) < 0)
1273                 return nfserr_bad_xdr;
1274
1275         return nfs_ok;
1276 }
1277
1278 static __be32
1279 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1280 {
1281         memset(&remove->rm_cinfo, 0, sizeof(remove->rm_cinfo));
1282         return nfsd4_decode_component4(argp, &remove->rm_name, &remove->rm_namelen);
1283 }
1284
1285 static __be32
1286 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1287 {
1288         __be32 status;
1289
1290         memset(rename, 0, sizeof(*rename));
1291         status = nfsd4_decode_component4(argp, &rename->rn_sname, &rename->rn_snamelen);
1292         if (status)
1293                 return status;
1294         return nfsd4_decode_component4(argp, &rename->rn_tname, &rename->rn_tnamelen);
1295 }
1296
1297 static __be32
1298 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1299 {
1300         return nfsd4_decode_clientid4(argp, clientid);
1301 }
1302
1303 static __be32
1304 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1305                      struct nfsd4_secinfo *secinfo)
1306 {
1307         secinfo->si_exp = NULL;
1308         return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen);
1309 }
1310
1311 static __be32
1312 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1313 {
1314         __be32 status;
1315
1316         memset(setattr, 0, sizeof(*setattr));
1317         status = nfsd4_decode_stateid4(argp, &setattr->sa_stateid);
1318         if (status)
1319                 return status;
1320         return nfsd4_decode_fattr4(argp, setattr->sa_bmval,
1321                                    ARRAY_SIZE(setattr->sa_bmval),
1322                                    &setattr->sa_iattr, &setattr->sa_acl,
1323                                    &setattr->sa_label, NULL);
1324 }
1325
1326 static __be32
1327 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1328 {
1329         __be32 *p, status;
1330
1331         memset(setclientid, 0, sizeof(*setclientid));
1332
1333         if (argp->minorversion >= 1)
1334                 return nfserr_notsupp;
1335
1336         status = nfsd4_decode_verifier4(argp, &setclientid->se_verf);
1337         if (status)
1338                 return status;
1339         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1340         if (status)
1341                 return status;
1342         if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_prog) < 0)
1343                 return nfserr_bad_xdr;
1344         if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_netid_len) < 0)
1345                 return nfserr_bad_xdr;
1346         p = xdr_inline_decode(argp->xdr, setclientid->se_callback_netid_len);
1347         if (!p)
1348                 return nfserr_bad_xdr;
1349         setclientid->se_callback_netid_val = svcxdr_savemem(argp, p,
1350                                                 setclientid->se_callback_netid_len);
1351         if (!setclientid->se_callback_netid_val)
1352                 return nfserr_jukebox;
1353
1354         if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_addr_len) < 0)
1355                 return nfserr_bad_xdr;
1356         p = xdr_inline_decode(argp->xdr, setclientid->se_callback_addr_len);
1357         if (!p)
1358                 return nfserr_bad_xdr;
1359         setclientid->se_callback_addr_val = svcxdr_savemem(argp, p,
1360                                                 setclientid->se_callback_addr_len);
1361         if (!setclientid->se_callback_addr_val)
1362                 return nfserr_jukebox;
1363         if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_ident) < 0)
1364                 return nfserr_bad_xdr;
1365
1366         return nfs_ok;
1367 }
1368
1369 static __be32
1370 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1371 {
1372         __be32 status;
1373
1374         if (argp->minorversion >= 1)
1375                 return nfserr_notsupp;
1376
1377         status = nfsd4_decode_clientid4(argp, &scd_c->sc_clientid);
1378         if (status)
1379                 return status;
1380         return nfsd4_decode_verifier4(argp, &scd_c->sc_confirm);
1381 }
1382
1383 /* Also used for NVERIFY */
1384 static __be32
1385 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1386 {
1387         __be32 *p, status;
1388
1389         memset(verify, 0, sizeof(*verify));
1390
1391         status = nfsd4_decode_bitmap4(argp, verify->ve_bmval,
1392                                       ARRAY_SIZE(verify->ve_bmval));
1393         if (status)
1394                 return status;
1395
1396         /* For convenience's sake, we compare raw xdr'd attributes in
1397          * nfsd4_proc_verify */
1398
1399         if (xdr_stream_decode_u32(argp->xdr, &verify->ve_attrlen) < 0)
1400                 return nfserr_bad_xdr;
1401         p = xdr_inline_decode(argp->xdr, verify->ve_attrlen);
1402         if (!p)
1403                 return nfserr_bad_xdr;
1404         verify->ve_attrval = svcxdr_savemem(argp, p, verify->ve_attrlen);
1405         if (!verify->ve_attrval)
1406                 return nfserr_jukebox;
1407
1408         return nfs_ok;
1409 }
1410
1411 static __be32
1412 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1413 {
1414         __be32 status;
1415
1416         status = nfsd4_decode_stateid4(argp, &write->wr_stateid);
1417         if (status)
1418                 return status;
1419         if (xdr_stream_decode_u64(argp->xdr, &write->wr_offset) < 0)
1420                 return nfserr_bad_xdr;
1421         if (xdr_stream_decode_u32(argp->xdr, &write->wr_stable_how) < 0)
1422                 return nfserr_bad_xdr;
1423         if (write->wr_stable_how > NFS_FILE_SYNC)
1424                 return nfserr_bad_xdr;
1425         if (xdr_stream_decode_u32(argp->xdr, &write->wr_buflen) < 0)
1426                 return nfserr_bad_xdr;
1427         if (!xdr_stream_subsegment(argp->xdr, &write->wr_payload, write->wr_buflen))
1428                 return nfserr_bad_xdr;
1429
1430         write->wr_bytes_written = 0;
1431         write->wr_how_written = 0;
1432         memset(&write->wr_verifier, 0, sizeof(write->wr_verifier));
1433         return nfs_ok;
1434 }
1435
1436 static __be32
1437 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1438 {
1439         __be32 status;
1440
1441         if (argp->minorversion >= 1)
1442                 return nfserr_notsupp;
1443
1444         status = nfsd4_decode_state_owner4(argp, &rlockowner->rl_clientid,
1445                                            &rlockowner->rl_owner);
1446         if (status)
1447                 return status;
1448
1449         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1450                 return nfserr_inval;
1451
1452         return nfs_ok;
1453 }
1454
1455 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
1456 {
1457         memset(bc, 0, sizeof(*bc));
1458         if (xdr_stream_decode_u32(argp->xdr, &bc->bc_cb_program) < 0)
1459                 return nfserr_bad_xdr;
1460         return nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
1461 }
1462
1463 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
1464 {
1465         u32 use_conn_in_rdma_mode;
1466         __be32 status;
1467
1468         memset(bcts, 0, sizeof(*bcts));
1469         status = nfsd4_decode_sessionid4(argp, &bcts->sessionid);
1470         if (status)
1471                 return status;
1472         if (xdr_stream_decode_u32(argp->xdr, &bcts->dir) < 0)
1473                 return nfserr_bad_xdr;
1474         if (xdr_stream_decode_u32(argp->xdr, &use_conn_in_rdma_mode) < 0)
1475                 return nfserr_bad_xdr;
1476
1477         return nfs_ok;
1478 }
1479
1480 static __be32
1481 nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp,
1482                                struct nfsd4_exchange_id *exid)
1483 {
1484         __be32 status;
1485
1486         status = nfsd4_decode_bitmap4(argp, exid->spo_must_enforce,
1487                                       ARRAY_SIZE(exid->spo_must_enforce));
1488         if (status)
1489                 return nfserr_bad_xdr;
1490         status = nfsd4_decode_bitmap4(argp, exid->spo_must_allow,
1491                                       ARRAY_SIZE(exid->spo_must_allow));
1492         if (status)
1493                 return nfserr_bad_xdr;
1494
1495         return nfs_ok;
1496 }
1497
1498 /*
1499  * This implementation currently does not support SP4_SSV.
1500  * This decoder simply skips over these arguments.
1501  */
1502 static noinline __be32
1503 nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp,
1504                           struct nfsd4_exchange_id *exid)
1505 {
1506         u32 count, window, num_gss_handles;
1507         __be32 status;
1508
1509         /* ssp_ops */
1510         status = nfsd4_decode_state_protect_ops(argp, exid);
1511         if (status)
1512                 return status;
1513
1514         /* ssp_hash_algs<> */
1515         if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1516                 return nfserr_bad_xdr;
1517         while (count--) {
1518                 status = nfsd4_decode_ignored_string(argp, 0);
1519                 if (status)
1520                         return status;
1521         }
1522
1523         /* ssp_encr_algs<> */
1524         if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1525                 return nfserr_bad_xdr;
1526         while (count--) {
1527                 status = nfsd4_decode_ignored_string(argp, 0);
1528                 if (status)
1529                         return status;
1530         }
1531
1532         if (xdr_stream_decode_u32(argp->xdr, &window) < 0)
1533                 return nfserr_bad_xdr;
1534         if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0)
1535                 return nfserr_bad_xdr;
1536
1537         return nfs_ok;
1538 }
1539
1540 static __be32
1541 nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp,
1542                               struct nfsd4_exchange_id *exid)
1543 {
1544         __be32 status;
1545
1546         if (xdr_stream_decode_u32(argp->xdr, &exid->spa_how) < 0)
1547                 return nfserr_bad_xdr;
1548         switch (exid->spa_how) {
1549         case SP4_NONE:
1550                 break;
1551         case SP4_MACH_CRED:
1552                 status = nfsd4_decode_state_protect_ops(argp, exid);
1553                 if (status)
1554                         return status;
1555                 break;
1556         case SP4_SSV:
1557                 status = nfsd4_decode_ssv_sp_parms(argp, exid);
1558                 if (status)
1559                         return status;
1560                 break;
1561         default:
1562                 return nfserr_bad_xdr;
1563         }
1564
1565         return nfs_ok;
1566 }
1567
1568 static __be32
1569 nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp,
1570                           struct nfsd4_exchange_id *exid)
1571 {
1572         __be32 status;
1573         u32 count;
1574
1575         if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1576                 return nfserr_bad_xdr;
1577         switch (count) {
1578         case 0:
1579                 break;
1580         case 1:
1581                 /* Note that RFC 8881 places no length limit on
1582                  * nii_domain, but this implementation permits no
1583                  * more than NFS4_OPAQUE_LIMIT bytes */
1584                 status = nfsd4_decode_opaque(argp, &exid->nii_domain);
1585                 if (status)
1586                         return status;
1587                 /* Note that RFC 8881 places no length limit on
1588                  * nii_name, but this implementation permits no
1589                  * more than NFS4_OPAQUE_LIMIT bytes */
1590                 status = nfsd4_decode_opaque(argp, &exid->nii_name);
1591                 if (status)
1592                         return status;
1593                 status = nfsd4_decode_nfstime4(argp, &exid->nii_time);
1594                 if (status)
1595                         return status;
1596                 break;
1597         default:
1598                 return nfserr_bad_xdr;
1599         }
1600
1601         return nfs_ok;
1602 }
1603
1604 static __be32
1605 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1606                          struct nfsd4_exchange_id *exid)
1607 {
1608         __be32 status;
1609
1610         memset(exid, 0, sizeof(*exid));
1611         status = nfsd4_decode_verifier4(argp, &exid->verifier);
1612         if (status)
1613                 return status;
1614         status = nfsd4_decode_opaque(argp, &exid->clname);
1615         if (status)
1616                 return status;
1617         if (xdr_stream_decode_u32(argp->xdr, &exid->flags) < 0)
1618                 return nfserr_bad_xdr;
1619         status = nfsd4_decode_state_protect4_a(argp, exid);
1620         if (status)
1621                 return status;
1622         return nfsd4_decode_nfs_impl_id4(argp, exid);
1623 }
1624
1625 static __be32
1626 nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp,
1627                             struct nfsd4_channel_attrs *ca)
1628 {
1629         __be32 *p;
1630
1631         p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7);
1632         if (!p)
1633                 return nfserr_bad_xdr;
1634
1635         /* headerpadsz is ignored */
1636         p++;
1637         ca->maxreq_sz = be32_to_cpup(p++);
1638         ca->maxresp_sz = be32_to_cpup(p++);
1639         ca->maxresp_cached = be32_to_cpup(p++);
1640         ca->maxops = be32_to_cpup(p++);
1641         ca->maxreqs = be32_to_cpup(p++);
1642         ca->nr_rdma_attrs = be32_to_cpup(p);
1643         switch (ca->nr_rdma_attrs) {
1644         case 0:
1645                 break;
1646         case 1:
1647                 if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0)
1648                         return nfserr_bad_xdr;
1649                 break;
1650         default:
1651                 return nfserr_bad_xdr;
1652         }
1653
1654         return nfs_ok;
1655 }
1656
1657 static __be32
1658 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1659                             struct nfsd4_create_session *sess)
1660 {
1661         __be32 status;
1662
1663         memset(sess, 0, sizeof(*sess));
1664         status = nfsd4_decode_clientid4(argp, &sess->clientid);
1665         if (status)
1666                 return status;
1667         if (xdr_stream_decode_u32(argp->xdr, &sess->seqid) < 0)
1668                 return nfserr_bad_xdr;
1669         if (xdr_stream_decode_u32(argp->xdr, &sess->flags) < 0)
1670                 return nfserr_bad_xdr;
1671         status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel);
1672         if (status)
1673                 return status;
1674         status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel);
1675         if (status)
1676                 return status;
1677         if (xdr_stream_decode_u32(argp->xdr, &sess->callback_prog) < 0)
1678                 return nfserr_bad_xdr;
1679         return nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1680 }
1681
1682 static __be32
1683 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1684                              struct nfsd4_destroy_session *destroy_session)
1685 {
1686         return nfsd4_decode_sessionid4(argp, &destroy_session->sessionid);
1687 }
1688
1689 static __be32
1690 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1691                           struct nfsd4_free_stateid *free_stateid)
1692 {
1693         return nfsd4_decode_stateid4(argp, &free_stateid->fr_stateid);
1694 }
1695
1696 #ifdef CONFIG_NFSD_PNFS
1697 static __be32
1698 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1699                 struct nfsd4_getdeviceinfo *gdev)
1700 {
1701         __be32 status;
1702
1703         memset(gdev, 0, sizeof(*gdev));
1704         status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid);
1705         if (status)
1706                 return status;
1707         if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0)
1708                 return nfserr_bad_xdr;
1709         if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0)
1710                 return nfserr_bad_xdr;
1711         if (xdr_stream_decode_uint32_array(argp->xdr,
1712                                            &gdev->gd_notify_types, 1) < 0)
1713                 return nfserr_bad_xdr;
1714
1715         return nfs_ok;
1716 }
1717
1718 static __be32
1719 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1720                           struct nfsd4_layoutcommit *lcp)
1721 {
1722         __be32 *p, status;
1723
1724         memset(lcp, 0, sizeof(*lcp));
1725         if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0)
1726                 return nfserr_bad_xdr;
1727         if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0)
1728                 return nfserr_bad_xdr;
1729         if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0)
1730                 return nfserr_bad_xdr;
1731         status = nfsd4_decode_stateid4(argp, &lcp->lc_sid);
1732         if (status)
1733                 return status;
1734         if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0)
1735                 return nfserr_bad_xdr;
1736         if (lcp->lc_newoffset) {
1737                 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0)
1738                         return nfserr_bad_xdr;
1739         } else
1740                 lcp->lc_last_wr = 0;
1741         p = xdr_inline_decode(argp->xdr, XDR_UNIT);
1742         if (!p)
1743                 return nfserr_bad_xdr;
1744         if (xdr_item_is_present(p)) {
1745                 status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime);
1746                 if (status)
1747                         return status;
1748         } else {
1749                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1750         }
1751         return nfsd4_decode_layoutupdate4(argp, lcp);
1752 }
1753
1754 static __be32
1755 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1756                 struct nfsd4_layoutget *lgp)
1757 {
1758         __be32 status;
1759
1760         memset(lgp, 0, sizeof(*lgp));
1761         if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_signal) < 0)
1762                 return nfserr_bad_xdr;
1763         if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_layout_type) < 0)
1764                 return nfserr_bad_xdr;
1765         if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_seg.iomode) < 0)
1766                 return nfserr_bad_xdr;
1767         if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.offset) < 0)
1768                 return nfserr_bad_xdr;
1769         if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.length) < 0)
1770                 return nfserr_bad_xdr;
1771         if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_minlength) < 0)
1772                 return nfserr_bad_xdr;
1773         status = nfsd4_decode_stateid4(argp, &lgp->lg_sid);
1774         if (status)
1775                 return status;
1776         if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_maxcount) < 0)
1777                 return nfserr_bad_xdr;
1778
1779         return nfs_ok;
1780 }
1781
1782 static __be32
1783 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1784                 struct nfsd4_layoutreturn *lrp)
1785 {
1786         memset(lrp, 0, sizeof(*lrp));
1787         if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0)
1788                 return nfserr_bad_xdr;
1789         if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0)
1790                 return nfserr_bad_xdr;
1791         if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0)
1792                 return nfserr_bad_xdr;
1793         return nfsd4_decode_layoutreturn4(argp, lrp);
1794 }
1795 #endif /* CONFIG_NFSD_PNFS */
1796
1797 static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1798                                            struct nfsd4_secinfo_no_name *sin)
1799 {
1800         if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0)
1801                 return nfserr_bad_xdr;
1802
1803         sin->sin_exp = NULL;
1804         return nfs_ok;
1805 }
1806
1807 static __be32
1808 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1809                       struct nfsd4_sequence *seq)
1810 {
1811         __be32 *p, status;
1812
1813         status = nfsd4_decode_sessionid4(argp, &seq->sessionid);
1814         if (status)
1815                 return status;
1816         p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4);
1817         if (!p)
1818                 return nfserr_bad_xdr;
1819         seq->seqid = be32_to_cpup(p++);
1820         seq->slotid = be32_to_cpup(p++);
1821         seq->maxslots = be32_to_cpup(p++);
1822         seq->cachethis = be32_to_cpup(p);
1823
1824         seq->status_flags = 0;
1825         return nfs_ok;
1826 }
1827
1828 static __be32
1829 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1830 {
1831         struct nfsd4_test_stateid_id *stateid;
1832         __be32 status;
1833         u32 i;
1834
1835         memset(test_stateid, 0, sizeof(*test_stateid));
1836         if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0)
1837                 return nfserr_bad_xdr;
1838
1839         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1840         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1841                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1842                 if (!stateid)
1843                         return nfserr_jukebox;
1844                 INIT_LIST_HEAD(&stateid->ts_id_list);
1845                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1846                 status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid);
1847                 if (status)
1848                         return status;
1849         }
1850
1851         return nfs_ok;
1852 }
1853
1854 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp,
1855                                             struct nfsd4_destroy_clientid *dc)
1856 {
1857         return nfsd4_decode_clientid4(argp, &dc->clientid);
1858 }
1859
1860 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp,
1861                                             struct nfsd4_reclaim_complete *rc)
1862 {
1863         if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0)
1864                 return nfserr_bad_xdr;
1865         return nfs_ok;
1866 }
1867
1868 static __be32
1869 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1870                        struct nfsd4_fallocate *fallocate)
1871 {
1872         __be32 status;
1873
1874         status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid);
1875         if (status)
1876                 return status;
1877         if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0)
1878                 return nfserr_bad_xdr;
1879         if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0)
1880                 return nfserr_bad_xdr;
1881
1882         return nfs_ok;
1883 }
1884
1885 static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
1886                                       struct nl4_server *ns)
1887 {
1888         struct nfs42_netaddr *naddr;
1889         __be32 *p;
1890
1891         if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0)
1892                 return nfserr_bad_xdr;
1893
1894         /* currently support for 1 inter-server source server */
1895         switch (ns->nl4_type) {
1896         case NL4_NETADDR:
1897                 naddr = &ns->u.nl4_addr;
1898
1899                 if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0)
1900                         return nfserr_bad_xdr;
1901                 if (naddr->netid_len > RPCBIND_MAXNETIDLEN)
1902                         return nfserr_bad_xdr;
1903
1904                 p = xdr_inline_decode(argp->xdr, naddr->netid_len);
1905                 if (!p)
1906                         return nfserr_bad_xdr;
1907                 memcpy(naddr->netid, p, naddr->netid_len);
1908
1909                 if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0)
1910                         return nfserr_bad_xdr;
1911                 if (naddr->addr_len > RPCBIND_MAXUADDRLEN)
1912                         return nfserr_bad_xdr;
1913
1914                 p = xdr_inline_decode(argp->xdr, naddr->addr_len);
1915                 if (!p)
1916                         return nfserr_bad_xdr;
1917                 memcpy(naddr->addr, p, naddr->addr_len);
1918                 break;
1919         default:
1920                 return nfserr_bad_xdr;
1921         }
1922
1923         return nfs_ok;
1924 }
1925
1926 static __be32
1927 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1928 {
1929         u32 consecutive, i, count, sync;
1930         struct nl4_server *ns_dummy;
1931         __be32 status;
1932
1933         memset(copy, 0, sizeof(*copy));
1934         status = nfsd4_decode_stateid4(argp, &copy->cp_src_stateid);
1935         if (status)
1936                 return status;
1937         status = nfsd4_decode_stateid4(argp, &copy->cp_dst_stateid);
1938         if (status)
1939                 return status;
1940         if (xdr_stream_decode_u64(argp->xdr, &copy->cp_src_pos) < 0)
1941                 return nfserr_bad_xdr;
1942         if (xdr_stream_decode_u64(argp->xdr, &copy->cp_dst_pos) < 0)
1943                 return nfserr_bad_xdr;
1944         if (xdr_stream_decode_u64(argp->xdr, &copy->cp_count) < 0)
1945                 return nfserr_bad_xdr;
1946         /* ca_consecutive: we always do consecutive copies */
1947         if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0)
1948                 return nfserr_bad_xdr;
1949         if (xdr_stream_decode_bool(argp->xdr, &sync) < 0)
1950                 return nfserr_bad_xdr;
1951         nfsd4_copy_set_sync(copy, sync);
1952
1953         if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1954                 return nfserr_bad_xdr;
1955         copy->cp_src = svcxdr_tmpalloc(argp, sizeof(*copy->cp_src));
1956         if (copy->cp_src == NULL)
1957                 return nfserr_jukebox;
1958         if (count == 0) { /* intra-server copy */
1959                 __set_bit(NFSD4_COPY_F_INTRA, &copy->cp_flags);
1960                 return nfs_ok;
1961         }
1962
1963         /* decode all the supplied server addresses but use only the first */
1964         status = nfsd4_decode_nl4_server(argp, copy->cp_src);
1965         if (status)
1966                 return status;
1967
1968         ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL);
1969         if (ns_dummy == NULL)
1970                 return nfserr_jukebox;
1971         for (i = 0; i < count - 1; i++) {
1972                 status = nfsd4_decode_nl4_server(argp, ns_dummy);
1973                 if (status) {
1974                         kfree(ns_dummy);
1975                         return status;
1976                 }
1977         }
1978         kfree(ns_dummy);
1979
1980         return nfs_ok;
1981 }
1982
1983 static __be32
1984 nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp,
1985                          struct nfsd4_copy_notify *cn)
1986 {
1987         __be32 status;
1988
1989         memset(cn, 0, sizeof(*cn));
1990         cn->cpn_src = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_src));
1991         if (cn->cpn_src == NULL)
1992                 return nfserr_jukebox;
1993         cn->cpn_dst = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_dst));
1994         if (cn->cpn_dst == NULL)
1995                 return nfserr_jukebox;
1996
1997         status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid);
1998         if (status)
1999                 return status;
2000         return nfsd4_decode_nl4_server(argp, cn->cpn_dst);
2001 }
2002
2003 static __be32
2004 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
2005                             struct nfsd4_offload_status *os)
2006 {
2007         os->count = 0;
2008         os->status = 0;
2009         return nfsd4_decode_stateid4(argp, &os->stateid);
2010 }
2011
2012 static __be32
2013 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
2014 {
2015         __be32 status;
2016
2017         status = nfsd4_decode_stateid4(argp, &seek->seek_stateid);
2018         if (status)
2019                 return status;
2020         if (xdr_stream_decode_u64(argp->xdr, &seek->seek_offset) < 0)
2021                 return nfserr_bad_xdr;
2022         if (xdr_stream_decode_u32(argp->xdr, &seek->seek_whence) < 0)
2023                 return nfserr_bad_xdr;
2024
2025         seek->seek_eof = 0;
2026         seek->seek_pos = 0;
2027         return nfs_ok;
2028 }
2029
2030 static __be32
2031 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
2032 {
2033         __be32 status;
2034
2035         status = nfsd4_decode_stateid4(argp, &clone->cl_src_stateid);
2036         if (status)
2037                 return status;
2038         status = nfsd4_decode_stateid4(argp, &clone->cl_dst_stateid);
2039         if (status)
2040                 return status;
2041         if (xdr_stream_decode_u64(argp->xdr, &clone->cl_src_pos) < 0)
2042                 return nfserr_bad_xdr;
2043         if (xdr_stream_decode_u64(argp->xdr, &clone->cl_dst_pos) < 0)
2044                 return nfserr_bad_xdr;
2045         if (xdr_stream_decode_u64(argp->xdr, &clone->cl_count) < 0)
2046                 return nfserr_bad_xdr;
2047
2048         return nfs_ok;
2049 }
2050
2051 /*
2052  * XDR data that is more than PAGE_SIZE in size is normally part of a
2053  * read or write. However, the size of extended attributes is limited
2054  * by the maximum request size, and then further limited by the underlying
2055  * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX
2056  * is 64k). Since there is no kvec- or page-based interface to xattrs,
2057  * and we're not dealing with contiguous pages, we need to do some copying.
2058  */
2059
2060 /*
2061  * Decode data into buffer.
2062  */
2063 static __be32
2064 nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr,
2065                        char **bufp, u32 buflen)
2066 {
2067         struct page **pages = xdr->pages;
2068         struct kvec *head = xdr->head;
2069         char *tmp, *dp;
2070         u32 len;
2071
2072         if (buflen <= head->iov_len) {
2073                 /*
2074                  * We're in luck, the head has enough space. Just return
2075                  * the head, no need for copying.
2076                  */
2077                 *bufp = head->iov_base;
2078                 return 0;
2079         }
2080
2081         tmp = svcxdr_tmpalloc(argp, buflen);
2082         if (tmp == NULL)
2083                 return nfserr_jukebox;
2084
2085         dp = tmp;
2086         memcpy(dp, head->iov_base, head->iov_len);
2087         buflen -= head->iov_len;
2088         dp += head->iov_len;
2089
2090         while (buflen > 0) {
2091                 len = min_t(u32, buflen, PAGE_SIZE);
2092                 memcpy(dp, page_address(*pages), len);
2093
2094                 buflen -= len;
2095                 dp += len;
2096                 pages++;
2097         }
2098
2099         *bufp = tmp;
2100         return 0;
2101 }
2102
2103 /*
2104  * Get a user extended attribute name from the XDR buffer.
2105  * It will not have the "user." prefix, so prepend it.
2106  * Lastly, check for nul characters in the name.
2107  */
2108 static __be32
2109 nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep)
2110 {
2111         char *name, *sp, *dp;
2112         u32 namelen, cnt;
2113         __be32 *p;
2114
2115         if (xdr_stream_decode_u32(argp->xdr, &namelen) < 0)
2116                 return nfserr_bad_xdr;
2117         if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN))
2118                 return nfserr_nametoolong;
2119         if (namelen == 0)
2120                 return nfserr_bad_xdr;
2121         p = xdr_inline_decode(argp->xdr, namelen);
2122         if (!p)
2123                 return nfserr_bad_xdr;
2124         name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1);
2125         if (!name)
2126                 return nfserr_jukebox;
2127         memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
2128
2129         /*
2130          * Copy the extended attribute name over while checking for 0
2131          * characters.
2132          */
2133         sp = (char *)p;
2134         dp = name + XATTR_USER_PREFIX_LEN;
2135         cnt = namelen;
2136
2137         while (cnt-- > 0) {
2138                 if (*sp == '\0')
2139                         return nfserr_bad_xdr;
2140                 *dp++ = *sp++;
2141         }
2142         *dp = '\0';
2143
2144         *namep = name;
2145
2146         return nfs_ok;
2147 }
2148
2149 /*
2150  * A GETXATTR op request comes without a length specifier. We just set the
2151  * maximum length for the reply based on XATTR_SIZE_MAX and the maximum
2152  * channel reply size. nfsd_getxattr will probe the length of the xattr,
2153  * check it against getxa_len, and allocate + return the value.
2154  */
2155 static __be32
2156 nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp,
2157                       struct nfsd4_getxattr *getxattr)
2158 {
2159         __be32 status;
2160         u32 maxcount;
2161
2162         memset(getxattr, 0, sizeof(*getxattr));
2163         status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name);
2164         if (status)
2165                 return status;
2166
2167         maxcount = svc_max_payload(argp->rqstp);
2168         maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2169
2170         getxattr->getxa_len = maxcount;
2171         return nfs_ok;
2172 }
2173
2174 static __be32
2175 nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp,
2176                       struct nfsd4_setxattr *setxattr)
2177 {
2178         u32 flags, maxcount, size;
2179         __be32 status;
2180
2181         memset(setxattr, 0, sizeof(*setxattr));
2182
2183         if (xdr_stream_decode_u32(argp->xdr, &flags) < 0)
2184                 return nfserr_bad_xdr;
2185
2186         if (flags > SETXATTR4_REPLACE)
2187                 return nfserr_inval;
2188         setxattr->setxa_flags = flags;
2189
2190         status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name);
2191         if (status)
2192                 return status;
2193
2194         maxcount = svc_max_payload(argp->rqstp);
2195         maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2196
2197         if (xdr_stream_decode_u32(argp->xdr, &size) < 0)
2198                 return nfserr_bad_xdr;
2199         if (size > maxcount)
2200                 return nfserr_xattr2big;
2201
2202         setxattr->setxa_len = size;
2203         if (size > 0) {
2204                 struct xdr_buf payload;
2205
2206                 if (!xdr_stream_subsegment(argp->xdr, &payload, size))
2207                         return nfserr_bad_xdr;
2208                 status = nfsd4_vbuf_from_vector(argp, &payload,
2209                                                 &setxattr->setxa_buf, size);
2210         }
2211
2212         return nfs_ok;
2213 }
2214
2215 static __be32
2216 nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp,
2217                         struct nfsd4_listxattrs *listxattrs)
2218 {
2219         u32 maxcount;
2220
2221         memset(listxattrs, 0, sizeof(*listxattrs));
2222
2223         if (xdr_stream_decode_u64(argp->xdr, &listxattrs->lsxa_cookie) < 0)
2224                 return nfserr_bad_xdr;
2225
2226         /*
2227          * If the cookie  is too large to have even one user.x attribute
2228          * plus trailing '\0' left in a maximum size buffer, it's invalid.
2229          */
2230         if (listxattrs->lsxa_cookie >=
2231             (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2)))
2232                 return nfserr_badcookie;
2233
2234         if (xdr_stream_decode_u32(argp->xdr, &maxcount) < 0)
2235                 return nfserr_bad_xdr;
2236         if (maxcount < 8)
2237                 /* Always need at least 2 words (length and one character) */
2238                 return nfserr_inval;
2239
2240         maxcount = min(maxcount, svc_max_payload(argp->rqstp));
2241         listxattrs->lsxa_maxcount = maxcount;
2242
2243         return nfs_ok;
2244 }
2245
2246 static __be32
2247 nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp,
2248                          struct nfsd4_removexattr *removexattr)
2249 {
2250         memset(removexattr, 0, sizeof(*removexattr));
2251         return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name);
2252 }
2253
2254 static __be32
2255 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
2256 {
2257         return nfs_ok;
2258 }
2259
2260 static __be32
2261 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
2262 {
2263         return nfserr_notsupp;
2264 }
2265
2266 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
2267
2268 static const nfsd4_dec nfsd4_dec_ops[] = {
2269         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
2270         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
2271         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
2272         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
2273         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
2274         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
2275         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
2276         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
2277         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
2278         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
2279         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
2280         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
2281         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
2282         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
2283         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
2284         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
2285         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
2286         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
2287         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
2288         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
2289         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
2290         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
2291         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
2292         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
2293         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
2294         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
2295         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
2296         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
2297         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
2298         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
2299         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
2300         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
2301         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
2302         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
2303         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
2304         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
2305         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
2306
2307         /* new operations for NFSv4.1 */
2308         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
2309         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
2310         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
2311         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
2312         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
2313         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
2314         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
2315 #ifdef CONFIG_NFSD_PNFS
2316         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
2317         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
2318         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
2319         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
2320         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
2321 #else
2322         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
2323         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
2324         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
2325         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
2326         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
2327 #endif
2328         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
2329         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
2330         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
2331         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
2332         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
2333         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
2334         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
2335
2336         /* new operations for NFSv4.2 */
2337         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
2338         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
2339         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_copy_notify,
2340         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
2341         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
2342         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
2343         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
2344         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_offload_status,
2345         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_offload_status,
2346         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_read,
2347         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
2348         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
2349         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
2350         /* RFC 8276 extended atributes operations */
2351         [OP_GETXATTR]           = (nfsd4_dec)nfsd4_decode_getxattr,
2352         [OP_SETXATTR]           = (nfsd4_dec)nfsd4_decode_setxattr,
2353         [OP_LISTXATTRS]         = (nfsd4_dec)nfsd4_decode_listxattrs,
2354         [OP_REMOVEXATTR]        = (nfsd4_dec)nfsd4_decode_removexattr,
2355 };
2356
2357 static inline bool
2358 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
2359 {
2360         if (op->opnum < FIRST_NFS4_OP)
2361                 return false;
2362         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
2363                 return false;
2364         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
2365                 return false;
2366         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
2367                 return false;
2368         return true;
2369 }
2370
2371 static bool
2372 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
2373 {
2374         struct nfsd4_op *op;
2375         bool cachethis = false;
2376         int auth_slack= argp->rqstp->rq_auth_slack;
2377         int max_reply = auth_slack + 8; /* opcnt, status */
2378         int readcount = 0;
2379         int readbytes = 0;
2380         __be32 *p;
2381         int i;
2382
2383         if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0)
2384                 return false;
2385         max_reply += XDR_UNIT;
2386         argp->tag = NULL;
2387         if (unlikely(argp->taglen)) {
2388                 if (argp->taglen > NFSD4_MAX_TAGLEN)
2389                         return false;
2390                 p = xdr_inline_decode(argp->xdr, argp->taglen);
2391                 if (!p)
2392                         return false;
2393                 argp->tag = svcxdr_savemem(argp, p, argp->taglen);
2394                 if (!argp->tag)
2395                         return false;
2396                 max_reply += xdr_align_size(argp->taglen);
2397         }
2398
2399         if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0)
2400                 return false;
2401         if (xdr_stream_decode_u32(argp->xdr, &argp->client_opcnt) < 0)
2402                 return false;
2403         argp->opcnt = min_t(u32, argp->client_opcnt,
2404                             NFSD_MAX_OPS_PER_COMPOUND);
2405
2406         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
2407                 argp->ops = vcalloc(argp->opcnt, sizeof(*argp->ops));
2408                 if (!argp->ops) {
2409                         argp->ops = argp->iops;
2410                         return false;
2411                 }
2412         }
2413
2414         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
2415                 argp->opcnt = 0;
2416
2417         for (i = 0; i < argp->opcnt; i++) {
2418                 op = &argp->ops[i];
2419                 op->replay = NULL;
2420
2421                 if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0)
2422                         return false;
2423                 if (nfsd4_opnum_in_range(argp, op)) {
2424                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
2425                         if (op->status != nfs_ok)
2426                                 trace_nfsd_compound_decode_err(argp->rqstp,
2427                                                                argp->opcnt, i,
2428                                                                op->opnum,
2429                                                                op->status);
2430                 } else {
2431                         op->opnum = OP_ILLEGAL;
2432                         op->status = nfserr_op_illegal;
2433                 }
2434                 op->opdesc = OPDESC(op);
2435                 /*
2436                  * We'll try to cache the result in the DRC if any one
2437                  * op in the compound wants to be cached:
2438                  */
2439                 cachethis |= nfsd4_cache_this_op(op);
2440
2441                 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) {
2442                         readcount++;
2443                         readbytes += nfsd4_max_reply(argp->rqstp, op);
2444                 } else
2445                         max_reply += nfsd4_max_reply(argp->rqstp, op);
2446                 /*
2447                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
2448                  * (Special case because it will just skip encoding this
2449                  * if it runs out of xdr buffer space, and it is the only
2450                  * operation that behaves this way.)
2451                  */
2452                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
2453                         max_reply += NFS4_OPAQUE_LIMIT;
2454
2455                 if (op->status) {
2456                         argp->opcnt = i+1;
2457                         break;
2458                 }
2459         }
2460         /* Sessions make the DRC unnecessary: */
2461         if (argp->minorversion)
2462                 cachethis = false;
2463         svc_reserve(argp->rqstp, max_reply + readbytes);
2464         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
2465
2466         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
2467                 __clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
2468
2469         return true;
2470 }
2471
2472 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
2473                              struct svc_export *exp)
2474 {
2475         if (exp->ex_flags & NFSEXP_V4ROOT) {
2476                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
2477                 *p++ = 0;
2478         } else
2479                 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2480         return p;
2481 }
2482
2483 /*
2484  * ctime (in NFSv4, time_metadata) is not writeable, and the client
2485  * doesn't really care what resolution could theoretically be stored by
2486  * the filesystem.
2487  *
2488  * The client cares how close together changes can be while still
2489  * guaranteeing ctime changes.  For most filesystems (which have
2490  * timestamps with nanosecond fields) that is limited by the resolution
2491  * of the time returned from current_time() (which I'm assuming to be
2492  * 1/HZ).
2493  */
2494 static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2495 {
2496         struct timespec64 ts;
2497         u32 ns;
2498
2499         ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2500         ts = ns_to_timespec64(ns);
2501
2502         p = xdr_encode_hyper(p, ts.tv_sec);
2503         *p++ = cpu_to_be32(ts.tv_nsec);
2504
2505         return p;
2506 }
2507
2508 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2509 {
2510         *p++ = cpu_to_be32(c->atomic);
2511         p = xdr_encode_hyper(p, c->before_change);
2512         p = xdr_encode_hyper(p, c->after_change);
2513         return p;
2514 }
2515
2516 /* Encode as an array of strings the string given with components
2517  * separated @sep, escaped with esc_enter and esc_exit.
2518  */
2519 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2520                                           char *components, char esc_enter,
2521                                           char esc_exit)
2522 {
2523         __be32 *p;
2524         __be32 pathlen;
2525         int pathlen_offset;
2526         int strlen, count=0;
2527         char *str, *end, *next;
2528
2529         dprintk("nfsd4_encode_components(%s)\n", components);
2530
2531         pathlen_offset = xdr->buf->len;
2532         p = xdr_reserve_space(xdr, 4);
2533         if (!p)
2534                 return nfserr_resource;
2535         p++; /* We will fill this in with @count later */
2536
2537         end = str = components;
2538         while (*end) {
2539                 bool found_esc = false;
2540
2541                 /* try to parse as esc_start, ..., esc_end, sep */
2542                 if (*str == esc_enter) {
2543                         for (; *end && (*end != esc_exit); end++)
2544                                 /* find esc_exit or end of string */;
2545                         next = end + 1;
2546                         if (*end && (!*next || *next == sep)) {
2547                                 str++;
2548                                 found_esc = true;
2549                         }
2550                 }
2551
2552                 if (!found_esc)
2553                         for (; *end && (*end != sep); end++)
2554                                 /* find sep or end of string */;
2555
2556                 strlen = end - str;
2557                 if (strlen) {
2558                         p = xdr_reserve_space(xdr, strlen + 4);
2559                         if (!p)
2560                                 return nfserr_resource;
2561                         p = xdr_encode_opaque(p, str, strlen);
2562                         count++;
2563                 }
2564                 else
2565                         end++;
2566                 if (found_esc)
2567                         end = next;
2568
2569                 str = end;
2570         }
2571         pathlen = htonl(count);
2572         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2573         return 0;
2574 }
2575
2576 /* Encode as an array of strings the string given with components
2577  * separated @sep.
2578  */
2579 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2580                                       char *components)
2581 {
2582         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2583 }
2584
2585 /*
2586  * encode a location element of a fs_locations structure
2587  */
2588 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2589                                         struct nfsd4_fs_location *location)
2590 {
2591         __be32 status;
2592
2593         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2594                                                 '[', ']');
2595         if (status)
2596                 return status;
2597         status = nfsd4_encode_components(xdr, '/', location->path);
2598         if (status)
2599                 return status;
2600         return 0;
2601 }
2602
2603 /*
2604  * Encode a path in RFC3530 'pathname4' format
2605  */
2606 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2607                                 const struct path *root,
2608                                 const struct path *path)
2609 {
2610         struct path cur = *path;
2611         __be32 *p;
2612         struct dentry **components = NULL;
2613         unsigned int ncomponents = 0;
2614         __be32 err = nfserr_jukebox;
2615
2616         dprintk("nfsd4_encode_components(");
2617
2618         path_get(&cur);
2619         /* First walk the path up to the nfsd root, and store the
2620          * dentries/path components in an array.
2621          */
2622         for (;;) {
2623                 if (path_equal(&cur, root))
2624                         break;
2625                 if (cur.dentry == cur.mnt->mnt_root) {
2626                         if (follow_up(&cur))
2627                                 continue;
2628                         goto out_free;
2629                 }
2630                 if ((ncomponents & 15) == 0) {
2631                         struct dentry **new;
2632                         new = krealloc(components,
2633                                         sizeof(*new) * (ncomponents + 16),
2634                                         GFP_KERNEL);
2635                         if (!new)
2636                                 goto out_free;
2637                         components = new;
2638                 }
2639                 components[ncomponents++] = cur.dentry;
2640                 cur.dentry = dget_parent(cur.dentry);
2641         }
2642         err = nfserr_resource;
2643         p = xdr_reserve_space(xdr, 4);
2644         if (!p)
2645                 goto out_free;
2646         *p++ = cpu_to_be32(ncomponents);
2647
2648         while (ncomponents) {
2649                 struct dentry *dentry = components[ncomponents - 1];
2650                 unsigned int len;
2651
2652                 spin_lock(&dentry->d_lock);
2653                 len = dentry->d_name.len;
2654                 p = xdr_reserve_space(xdr, len + 4);
2655                 if (!p) {
2656                         spin_unlock(&dentry->d_lock);
2657                         goto out_free;
2658                 }
2659                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2660                 dprintk("/%pd", dentry);
2661                 spin_unlock(&dentry->d_lock);
2662                 dput(dentry);
2663                 ncomponents--;
2664         }
2665
2666         err = 0;
2667 out_free:
2668         dprintk(")\n");
2669         while (ncomponents)
2670                 dput(components[--ncomponents]);
2671         kfree(components);
2672         path_put(&cur);
2673         return err;
2674 }
2675
2676 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2677                         struct svc_rqst *rqstp, const struct path *path)
2678 {
2679         struct svc_export *exp_ps;
2680         __be32 res;
2681
2682         exp_ps = rqst_find_fsidzero_export(rqstp);
2683         if (IS_ERR(exp_ps))
2684                 return nfserrno(PTR_ERR(exp_ps));
2685         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2686         exp_put(exp_ps);
2687         return res;
2688 }
2689
2690 /*
2691  *  encode a fs_locations structure
2692  */
2693 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2694                         struct svc_rqst *rqstp, struct svc_export *exp)
2695 {
2696         __be32 status;
2697         int i;
2698         __be32 *p;
2699         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2700
2701         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2702         if (status)
2703                 return status;
2704         p = xdr_reserve_space(xdr, 4);
2705         if (!p)
2706                 return nfserr_resource;
2707         *p++ = cpu_to_be32(fslocs->locations_count);
2708         for (i=0; i<fslocs->locations_count; i++) {
2709                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2710                 if (status)
2711                         return status;
2712         }
2713         return 0;
2714 }
2715
2716 static u32 nfs4_file_type(umode_t mode)
2717 {
2718         switch (mode & S_IFMT) {
2719         case S_IFIFO:   return NF4FIFO;
2720         case S_IFCHR:   return NF4CHR;
2721         case S_IFDIR:   return NF4DIR;
2722         case S_IFBLK:   return NF4BLK;
2723         case S_IFLNK:   return NF4LNK;
2724         case S_IFREG:   return NF4REG;
2725         case S_IFSOCK:  return NF4SOCK;
2726         default:        return NF4BAD;
2727         }
2728 }
2729
2730 static inline __be32
2731 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2732                      struct nfs4_ace *ace)
2733 {
2734         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2735                 return nfs4_acl_write_who(xdr, ace->whotype);
2736         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2737                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2738         else
2739                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2740 }
2741
2742 static inline __be32
2743 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2744 {
2745         __be32          *p;
2746         unsigned long   i = hweight_long(layout_types);
2747
2748         p = xdr_reserve_space(xdr, 4 + 4 * i);
2749         if (!p)
2750                 return nfserr_resource;
2751
2752         *p++ = cpu_to_be32(i);
2753
2754         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2755                 if (layout_types & (1 << i))
2756                         *p++ = cpu_to_be32(i);
2757
2758         return 0;
2759 }
2760
2761 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2762                               FATTR4_WORD0_RDATTR_ERROR)
2763 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2764 #define WORD2_ABSENT_FS_ATTRS 0
2765
2766 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2767 static inline __be32
2768 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2769                             void *context, int len)
2770 {
2771         __be32 *p;
2772
2773         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2774         if (!p)
2775                 return nfserr_resource;
2776
2777         /*
2778          * For now we use a 0 here to indicate the null translation; in
2779          * the future we may place a call to translation code here.
2780          */
2781         *p++ = cpu_to_be32(0); /* lfs */
2782         *p++ = cpu_to_be32(0); /* pi */
2783         p = xdr_encode_opaque(p, context, len);
2784         return 0;
2785 }
2786 #else
2787 static inline __be32
2788 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2789                             void *context, int len)
2790 { return 0; }
2791 #endif
2792
2793 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2794 {
2795         /* As per referral draft:  */
2796         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2797             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2798                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2799                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2800                         *rdattr_err = NFSERR_MOVED;
2801                 else
2802                         return nfserr_moved;
2803         }
2804         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2805         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2806         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2807         return 0;
2808 }
2809
2810
2811 static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino)
2812 {
2813         struct path path = exp->ex_path;
2814         struct kstat stat;
2815         int err;
2816
2817         path_get(&path);
2818         while (follow_up(&path)) {
2819                 if (path.dentry != path.mnt->mnt_root)
2820                         break;
2821         }
2822         err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT);
2823         path_put(&path);
2824         if (!err)
2825                 *pino = stat.ino;
2826         return err;
2827 }
2828
2829 static __be32
2830 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2831 {
2832         __be32 *p;
2833
2834         if (bmval2) {
2835                 p = xdr_reserve_space(xdr, 16);
2836                 if (!p)
2837                         goto out_resource;
2838                 *p++ = cpu_to_be32(3);
2839                 *p++ = cpu_to_be32(bmval0);
2840                 *p++ = cpu_to_be32(bmval1);
2841                 *p++ = cpu_to_be32(bmval2);
2842         } else if (bmval1) {
2843                 p = xdr_reserve_space(xdr, 12);
2844                 if (!p)
2845                         goto out_resource;
2846                 *p++ = cpu_to_be32(2);
2847                 *p++ = cpu_to_be32(bmval0);
2848                 *p++ = cpu_to_be32(bmval1);
2849         } else {
2850                 p = xdr_reserve_space(xdr, 8);
2851                 if (!p)
2852                         goto out_resource;
2853                 *p++ = cpu_to_be32(1);
2854                 *p++ = cpu_to_be32(bmval0);
2855         }
2856
2857         return 0;
2858 out_resource:
2859         return nfserr_resource;
2860 }
2861
2862 /*
2863  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2864  * ourselves.
2865  */
2866 static __be32
2867 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2868                 struct svc_export *exp,
2869                 struct dentry *dentry, u32 *bmval,
2870                 struct svc_rqst *rqstp, int ignore_crossmnt)
2871 {
2872         u32 bmval0 = bmval[0];
2873         u32 bmval1 = bmval[1];
2874         u32 bmval2 = bmval[2];
2875         struct kstat stat;
2876         struct svc_fh *tempfh = NULL;
2877         struct kstatfs statfs;
2878         __be32 *p, *attrlen_p;
2879         int starting_len = xdr->buf->len;
2880         int attrlen_offset;
2881         u32 dummy;
2882         u64 dummy64;
2883         u32 rdattr_err = 0;
2884         __be32 status;
2885         int err;
2886         struct nfs4_acl *acl = NULL;
2887 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2888         void *context = NULL;
2889         int contextlen;
2890 #endif
2891         bool contextsupport = false;
2892         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2893         u32 minorversion = resp->cstate.minorversion;
2894         struct path path = {
2895                 .mnt    = exp->ex_path.mnt,
2896                 .dentry = dentry,
2897         };
2898         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2899
2900         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2901         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2902
2903         if (exp->ex_fslocs.migrated) {
2904                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2905                 if (status)
2906                         goto out;
2907         }
2908
2909         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2910         if (err)
2911                 goto out_nfserr;
2912         if (!(stat.result_mask & STATX_BTIME))
2913                 /* underlying FS does not offer btime so we can't share it */
2914                 bmval1 &= ~FATTR4_WORD1_TIME_CREATE;
2915         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2916                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2917             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2918                        FATTR4_WORD1_SPACE_TOTAL))) {
2919                 err = vfs_statfs(&path, &statfs);
2920                 if (err)
2921                         goto out_nfserr;
2922         }
2923         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2924                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2925                 status = nfserr_jukebox;
2926                 if (!tempfh)
2927                         goto out;
2928                 fh_init(tempfh, NFS4_FHSIZE);
2929                 status = fh_compose(tempfh, exp, dentry, NULL);
2930                 if (status)
2931                         goto out;
2932                 fhp = tempfh;
2933         }
2934         if (bmval0 & FATTR4_WORD0_ACL) {
2935                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2936                 if (err == -EOPNOTSUPP)
2937                         bmval0 &= ~FATTR4_WORD0_ACL;
2938                 else if (err == -EINVAL) {
2939                         status = nfserr_attrnotsupp;
2940                         goto out;
2941                 } else if (err != 0)
2942                         goto out_nfserr;
2943         }
2944
2945 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2946         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2947              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2948                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2949                         err = security_inode_getsecctx(d_inode(dentry),
2950                                                 &context, &contextlen);
2951                 else
2952                         err = -EOPNOTSUPP;
2953                 contextsupport = (err == 0);
2954                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2955                         if (err == -EOPNOTSUPP)
2956                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2957                         else if (err)
2958                                 goto out_nfserr;
2959                 }
2960         }
2961 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2962
2963         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2964         if (status)
2965                 goto out;
2966
2967         attrlen_offset = xdr->buf->len;
2968         attrlen_p = xdr_reserve_space(xdr, XDR_UNIT);
2969         if (!attrlen_p)
2970                 goto out_resource;
2971
2972         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2973                 u32 supp[3];
2974
2975                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2976
2977                 if (!IS_POSIXACL(dentry->d_inode))
2978                         supp[0] &= ~FATTR4_WORD0_ACL;
2979                 if (!contextsupport)
2980                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2981                 if (!supp[2]) {
2982                         p = xdr_reserve_space(xdr, 12);
2983                         if (!p)
2984                                 goto out_resource;
2985                         *p++ = cpu_to_be32(2);
2986                         *p++ = cpu_to_be32(supp[0]);
2987                         *p++ = cpu_to_be32(supp[1]);
2988                 } else {
2989                         p = xdr_reserve_space(xdr, 16);
2990                         if (!p)
2991                                 goto out_resource;
2992                         *p++ = cpu_to_be32(3);
2993                         *p++ = cpu_to_be32(supp[0]);
2994                         *p++ = cpu_to_be32(supp[1]);
2995                         *p++ = cpu_to_be32(supp[2]);
2996                 }
2997         }
2998         if (bmval0 & FATTR4_WORD0_TYPE) {
2999                 p = xdr_reserve_space(xdr, 4);
3000                 if (!p)
3001                         goto out_resource;
3002                 dummy = nfs4_file_type(stat.mode);
3003                 if (dummy == NF4BAD) {
3004                         status = nfserr_serverfault;
3005                         goto out;
3006                 }
3007                 *p++ = cpu_to_be32(dummy);
3008         }
3009         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
3010                 p = xdr_reserve_space(xdr, 4);
3011                 if (!p)
3012                         goto out_resource;
3013                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
3014                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
3015                 else
3016                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
3017                                                 NFS4_FH_VOL_RENAME);
3018         }
3019         if (bmval0 & FATTR4_WORD0_CHANGE) {
3020                 p = xdr_reserve_space(xdr, 8);
3021                 if (!p)
3022                         goto out_resource;
3023                 p = encode_change(p, &stat, d_inode(dentry), exp);
3024         }
3025         if (bmval0 & FATTR4_WORD0_SIZE) {
3026                 p = xdr_reserve_space(xdr, 8);
3027                 if (!p)
3028                         goto out_resource;
3029                 p = xdr_encode_hyper(p, stat.size);
3030         }
3031         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
3032                 p = xdr_reserve_space(xdr, 4);
3033                 if (!p)
3034                         goto out_resource;
3035                 *p++ = cpu_to_be32(1);
3036         }
3037         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
3038                 p = xdr_reserve_space(xdr, 4);
3039                 if (!p)
3040                         goto out_resource;
3041                 *p++ = cpu_to_be32(1);
3042         }
3043         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
3044                 p = xdr_reserve_space(xdr, 4);
3045                 if (!p)
3046                         goto out_resource;
3047                 *p++ = cpu_to_be32(0);
3048         }
3049         if (bmval0 & FATTR4_WORD0_FSID) {
3050                 p = xdr_reserve_space(xdr, 16);
3051                 if (!p)
3052                         goto out_resource;
3053                 if (exp->ex_fslocs.migrated) {
3054                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
3055                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
3056                 } else switch(fsid_source(fhp)) {
3057                 case FSIDSOURCE_FSID:
3058                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
3059                         p = xdr_encode_hyper(p, (u64)0);
3060                         break;
3061                 case FSIDSOURCE_DEV:
3062                         *p++ = cpu_to_be32(0);
3063                         *p++ = cpu_to_be32(MAJOR(stat.dev));
3064                         *p++ = cpu_to_be32(0);
3065                         *p++ = cpu_to_be32(MINOR(stat.dev));
3066                         break;
3067                 case FSIDSOURCE_UUID:
3068                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
3069                                                                 EX_UUID_LEN);
3070                         break;
3071                 }
3072         }
3073         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
3074                 p = xdr_reserve_space(xdr, 4);
3075                 if (!p)
3076                         goto out_resource;
3077                 *p++ = cpu_to_be32(0);
3078         }
3079         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
3080                 p = xdr_reserve_space(xdr, 4);
3081                 if (!p)
3082                         goto out_resource;
3083                 *p++ = cpu_to_be32(nn->nfsd4_lease);
3084         }
3085         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
3086                 p = xdr_reserve_space(xdr, 4);
3087                 if (!p)
3088                         goto out_resource;
3089                 *p++ = cpu_to_be32(rdattr_err);
3090         }
3091         if (bmval0 & FATTR4_WORD0_ACL) {
3092                 struct nfs4_ace *ace;
3093
3094                 if (acl == NULL) {
3095                         p = xdr_reserve_space(xdr, 4);
3096                         if (!p)
3097                                 goto out_resource;
3098
3099                         *p++ = cpu_to_be32(0);
3100                         goto out_acl;
3101                 }
3102                 p = xdr_reserve_space(xdr, 4);
3103                 if (!p)
3104                         goto out_resource;
3105                 *p++ = cpu_to_be32(acl->naces);
3106
3107                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
3108                         p = xdr_reserve_space(xdr, 4*3);
3109                         if (!p)
3110                                 goto out_resource;
3111                         *p++ = cpu_to_be32(ace->type);
3112                         *p++ = cpu_to_be32(ace->flag);
3113                         *p++ = cpu_to_be32(ace->access_mask &
3114                                                         NFS4_ACE_MASK_ALL);
3115                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
3116                         if (status)
3117                                 goto out;
3118                 }
3119         }
3120 out_acl:
3121         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
3122                 p = xdr_reserve_space(xdr, 4);
3123                 if (!p)
3124                         goto out_resource;
3125                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
3126                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
3127         }
3128         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
3129                 p = xdr_reserve_space(xdr, 4);
3130                 if (!p)
3131                         goto out_resource;
3132                 *p++ = cpu_to_be32(1);
3133         }
3134         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
3135                 p = xdr_reserve_space(xdr, 4);
3136                 if (!p)
3137                         goto out_resource;
3138                 *p++ = cpu_to_be32(0);
3139         }
3140         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
3141                 p = xdr_reserve_space(xdr, 4);
3142                 if (!p)
3143                         goto out_resource;
3144                 *p++ = cpu_to_be32(1);
3145         }
3146         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
3147                 p = xdr_reserve_space(xdr, 4);
3148                 if (!p)
3149                         goto out_resource;
3150                 *p++ = cpu_to_be32(1);
3151         }
3152         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
3153                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
3154                 if (!p)
3155                         goto out_resource;
3156                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw,
3157                                         fhp->fh_handle.fh_size);
3158         }
3159         if (bmval0 & FATTR4_WORD0_FILEID) {
3160                 p = xdr_reserve_space(xdr, 8);
3161                 if (!p)
3162                         goto out_resource;
3163                 p = xdr_encode_hyper(p, stat.ino);
3164         }
3165         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
3166                 p = xdr_reserve_space(xdr, 8);
3167                 if (!p)
3168                         goto out_resource;
3169                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
3170         }
3171         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
3172                 p = xdr_reserve_space(xdr, 8);
3173                 if (!p)
3174                         goto out_resource;
3175                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
3176         }
3177         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
3178                 p = xdr_reserve_space(xdr, 8);
3179                 if (!p)
3180                         goto out_resource;
3181                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
3182         }
3183         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
3184                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
3185                 if (status)
3186                         goto out;
3187         }
3188         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
3189                 p = xdr_reserve_space(xdr, 4);
3190                 if (!p)
3191                         goto out_resource;
3192                 *p++ = cpu_to_be32(1);
3193         }
3194         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
3195                 p = xdr_reserve_space(xdr, 8);
3196                 if (!p)
3197                         goto out_resource;
3198                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
3199         }
3200         if (bmval0 & FATTR4_WORD0_MAXLINK) {
3201                 p = xdr_reserve_space(xdr, 4);
3202                 if (!p)
3203                         goto out_resource;
3204                 *p++ = cpu_to_be32(255);
3205         }
3206         if (bmval0 & FATTR4_WORD0_MAXNAME) {
3207                 p = xdr_reserve_space(xdr, 4);
3208                 if (!p)
3209                         goto out_resource;
3210                 *p++ = cpu_to_be32(statfs.f_namelen);
3211         }
3212         if (bmval0 & FATTR4_WORD0_MAXREAD) {
3213                 p = xdr_reserve_space(xdr, 8);
3214                 if (!p)
3215                         goto out_resource;
3216                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
3217         }
3218         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
3219                 p = xdr_reserve_space(xdr, 8);
3220                 if (!p)
3221                         goto out_resource;
3222                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
3223         }
3224         if (bmval1 & FATTR4_WORD1_MODE) {
3225                 p = xdr_reserve_space(xdr, 4);
3226                 if (!p)
3227                         goto out_resource;
3228                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
3229         }
3230         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
3231                 p = xdr_reserve_space(xdr, 4);
3232                 if (!p)
3233                         goto out_resource;
3234                 *p++ = cpu_to_be32(1);
3235         }
3236         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
3237                 p = xdr_reserve_space(xdr, 4);
3238                 if (!p)
3239                         goto out_resource;
3240                 *p++ = cpu_to_be32(stat.nlink);
3241         }
3242         if (bmval1 & FATTR4_WORD1_OWNER) {
3243                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
3244                 if (status)
3245                         goto out;
3246         }
3247         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
3248                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
3249                 if (status)
3250                         goto out;
3251         }
3252         if (bmval1 & FATTR4_WORD1_RAWDEV) {
3253                 p = xdr_reserve_space(xdr, 8);
3254                 if (!p)
3255                         goto out_resource;
3256                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
3257                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
3258         }
3259         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
3260                 p = xdr_reserve_space(xdr, 8);
3261                 if (!p)
3262                         goto out_resource;
3263                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
3264                 p = xdr_encode_hyper(p, dummy64);
3265         }
3266         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
3267                 p = xdr_reserve_space(xdr, 8);
3268                 if (!p)
3269                         goto out_resource;
3270                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
3271                 p = xdr_encode_hyper(p, dummy64);
3272         }
3273         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
3274                 p = xdr_reserve_space(xdr, 8);
3275                 if (!p)
3276                         goto out_resource;
3277                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
3278                 p = xdr_encode_hyper(p, dummy64);
3279         }
3280         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
3281                 p = xdr_reserve_space(xdr, 8);
3282                 if (!p)
3283                         goto out_resource;
3284                 dummy64 = (u64)stat.blocks << 9;
3285                 p = xdr_encode_hyper(p, dummy64);
3286         }
3287         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
3288                 p = xdr_reserve_space(xdr, 12);
3289                 if (!p)
3290                         goto out_resource;
3291                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
3292                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
3293         }
3294         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
3295                 p = xdr_reserve_space(xdr, 12);
3296                 if (!p)
3297                         goto out_resource;
3298                 p = encode_time_delta(p, d_inode(dentry));
3299         }
3300         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
3301                 p = xdr_reserve_space(xdr, 12);
3302                 if (!p)
3303                         goto out_resource;
3304                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
3305                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
3306         }
3307         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
3308                 p = xdr_reserve_space(xdr, 12);
3309                 if (!p)
3310                         goto out_resource;
3311                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
3312                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
3313         }
3314         if (bmval1 & FATTR4_WORD1_TIME_CREATE) {
3315                 p = xdr_reserve_space(xdr, 12);
3316                 if (!p)
3317                         goto out_resource;
3318                 p = xdr_encode_hyper(p, (s64)stat.btime.tv_sec);
3319                 *p++ = cpu_to_be32(stat.btime.tv_nsec);
3320         }
3321         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
3322                 u64 ino = stat.ino;
3323
3324                 p = xdr_reserve_space(xdr, 8);
3325                 if (!p)
3326                         goto out_resource;
3327                 /*
3328                  * Get ino of mountpoint in parent filesystem, if not ignoring
3329                  * crossmount and this is the root of a cross-mounted
3330                  * filesystem.
3331                  */
3332                 if (ignore_crossmnt == 0 &&
3333                     dentry == exp->ex_path.mnt->mnt_root) {
3334                         err = nfsd4_get_mounted_on_ino(exp, &ino);
3335                         if (err)
3336                                 goto out_nfserr;
3337                 }
3338                 p = xdr_encode_hyper(p, ino);
3339         }
3340 #ifdef CONFIG_NFSD_PNFS
3341         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
3342                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
3343                 if (status)
3344                         goto out;
3345         }
3346
3347         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
3348                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
3349                 if (status)
3350                         goto out;
3351         }
3352
3353         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
3354                 p = xdr_reserve_space(xdr, 4);
3355                 if (!p)
3356                         goto out_resource;
3357                 *p++ = cpu_to_be32(stat.blksize);
3358         }
3359 #endif /* CONFIG_NFSD_PNFS */
3360         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
3361                 u32 supp[3];
3362
3363                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
3364                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
3365                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
3366                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
3367
3368                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
3369                 if (status)
3370                         goto out;
3371         }
3372
3373 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3374         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
3375                 status = nfsd4_encode_security_label(xdr, rqstp, context,
3376                                                                 contextlen);
3377                 if (status)
3378                         goto out;
3379         }
3380 #endif
3381
3382         if (bmval2 & FATTR4_WORD2_XATTR_SUPPORT) {
3383                 p = xdr_reserve_space(xdr, 4);
3384                 if (!p)
3385                         goto out_resource;
3386                 err = xattr_supported_namespace(d_inode(dentry),
3387                                                 XATTR_USER_PREFIX);
3388                 *p++ = cpu_to_be32(err == 0);
3389         }
3390
3391         *attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT);
3392         status = nfs_ok;
3393
3394 out:
3395 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3396         if (context)
3397                 security_release_secctx(context, contextlen);
3398 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3399         kfree(acl);
3400         if (tempfh) {
3401                 fh_put(tempfh);
3402                 kfree(tempfh);
3403         }
3404         if (status)
3405                 xdr_truncate_encode(xdr, starting_len);
3406         return status;
3407 out_nfserr:
3408         status = nfserrno(err);
3409         goto out;
3410 out_resource:
3411         status = nfserr_resource;
3412         goto out;
3413 }
3414
3415 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3416                                 struct xdr_buf *buf, __be32 *p, int bytes)
3417 {
3418         xdr->scratch.iov_len = 0;
3419         memset(buf, 0, sizeof(struct xdr_buf));
3420         buf->head[0].iov_base = p;
3421         buf->head[0].iov_len = 0;
3422         buf->len = 0;
3423         xdr->buf = buf;
3424         xdr->iov = buf->head;
3425         xdr->p = p;
3426         xdr->end = (void *)p + bytes;
3427         buf->buflen = bytes;
3428 }
3429
3430 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3431                         struct svc_fh *fhp, struct svc_export *exp,
3432                         struct dentry *dentry, u32 *bmval,
3433                         struct svc_rqst *rqstp, int ignore_crossmnt)
3434 {
3435         struct xdr_buf dummy;
3436         struct xdr_stream xdr;
3437         __be32 ret;
3438
3439         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
3440         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
3441                                                         ignore_crossmnt);
3442         *p = xdr.p;
3443         return ret;
3444 }
3445
3446 static inline int attributes_need_mount(u32 *bmval)
3447 {
3448         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3449                 return 1;
3450         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3451                 return 1;
3452         return 0;
3453 }
3454
3455 static __be32
3456 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
3457                         const char *name, int namlen)
3458 {
3459         struct svc_export *exp = cd->rd_fhp->fh_export;
3460         struct dentry *dentry;
3461         __be32 nfserr;
3462         int ignore_crossmnt = 0;
3463
3464         dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
3465         if (IS_ERR(dentry))
3466                 return nfserrno(PTR_ERR(dentry));
3467
3468         exp_get(exp);
3469         /*
3470          * In the case of a mountpoint, the client may be asking for
3471          * attributes that are only properties of the underlying filesystem
3472          * as opposed to the cross-mounted file system. In such a case,
3473          * we will not follow the cross mount and will fill the attribtutes
3474          * directly from the mountpoint dentry.
3475          */
3476         if (nfsd_mountpoint(dentry, exp)) {
3477                 int err;
3478
3479                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3480                                 && !attributes_need_mount(cd->rd_bmval)) {
3481                         ignore_crossmnt = 1;
3482                         goto out_encode;
3483                 }
3484                 /*
3485                  * Why the heck aren't we just using nfsd_lookup??
3486                  * Different "."/".." handling?  Something else?
3487                  * At least, add a comment here to explain....
3488                  */
3489                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3490                 if (err) {
3491                         nfserr = nfserrno(err);
3492                         goto out_put;
3493                 }
3494                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3495                 if (nfserr)
3496                         goto out_put;
3497
3498         }
3499 out_encode:
3500         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3501                                         cd->rd_rqstp, ignore_crossmnt);
3502 out_put:
3503         dput(dentry);
3504         exp_put(exp);
3505         return nfserr;
3506 }
3507
3508 static __be32 *
3509 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3510 {
3511         __be32 *p;
3512
3513         p = xdr_reserve_space(xdr, 20);
3514         if (!p)
3515                 return NULL;
3516         *p++ = htonl(2);
3517         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3518         *p++ = htonl(0);                         /* bmval1 */
3519
3520         *p++ = htonl(4);     /* attribute length */
3521         *p++ = nfserr;       /* no htonl */
3522         return p;
3523 }
3524
3525 static int
3526 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3527                     loff_t offset, u64 ino, unsigned int d_type)
3528 {
3529         struct readdir_cd *ccd = ccdv;
3530         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3531         struct xdr_stream *xdr = cd->xdr;
3532         int start_offset = xdr->buf->len;
3533         int cookie_offset;
3534         u32 name_and_cookie;
3535         int entry_bytes;
3536         __be32 nfserr = nfserr_toosmall;
3537         __be64 wire_offset;
3538         __be32 *p;
3539
3540         /* In nfsv4, "." and ".." never make it onto the wire.. */
3541         if (name && isdotent(name, namlen)) {
3542                 cd->common.err = nfs_ok;
3543                 return 0;
3544         }
3545
3546         if (cd->cookie_offset) {
3547                 wire_offset = cpu_to_be64(offset);
3548                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3549                                                         &wire_offset, 8);
3550         }
3551
3552         p = xdr_reserve_space(xdr, 4);
3553         if (!p)
3554                 goto fail;
3555         *p++ = xdr_one;                             /* mark entry present */
3556         cookie_offset = xdr->buf->len;
3557         p = xdr_reserve_space(xdr, 3*4 + namlen);
3558         if (!p)
3559                 goto fail;
3560         p = xdr_encode_hyper(p, OFFSET_MAX);        /* offset of next entry */
3561         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3562
3563         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3564         switch (nfserr) {
3565         case nfs_ok:
3566                 break;
3567         case nfserr_resource:
3568                 nfserr = nfserr_toosmall;
3569                 goto fail;
3570         case nfserr_noent:
3571                 xdr_truncate_encode(xdr, start_offset);
3572                 goto skip_entry;
3573         default:
3574                 /*
3575                  * If the client requested the RDATTR_ERROR attribute,
3576                  * we stuff the error code into this attribute
3577                  * and continue.  If this attribute was not requested,
3578                  * then in accordance with the spec, we fail the
3579                  * entire READDIR operation(!)
3580                  */
3581                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3582                         goto fail;
3583                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3584                 if (p == NULL) {
3585                         nfserr = nfserr_toosmall;
3586                         goto fail;
3587                 }
3588         }
3589         nfserr = nfserr_toosmall;
3590         entry_bytes = xdr->buf->len - start_offset;
3591         if (entry_bytes > cd->rd_maxcount)
3592                 goto fail;
3593         cd->rd_maxcount -= entry_bytes;
3594         /*
3595          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and
3596          * notes that it could be zero. If it is zero, then the server
3597          * should enforce only the rd_maxcount value.
3598          */
3599         if (cd->rd_dircount) {
3600                 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3601                 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3602                         goto fail;
3603                 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3604                 if (!cd->rd_dircount)
3605                         cd->rd_maxcount = 0;
3606         }
3607
3608         cd->cookie_offset = cookie_offset;
3609 skip_entry:
3610         cd->common.err = nfs_ok;
3611         return 0;
3612 fail:
3613         xdr_truncate_encode(xdr, start_offset);
3614         cd->common.err = nfserr;
3615         return -EINVAL;
3616 }
3617
3618 static __be32
3619 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3620 {
3621         __be32 *p;
3622
3623         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3624         if (!p)
3625                 return nfserr_resource;
3626         *p++ = cpu_to_be32(sid->si_generation);
3627         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3628                                         sizeof(stateid_opaque_t));
3629         return 0;
3630 }
3631
3632 static __be32
3633 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3634 {
3635         struct xdr_stream *xdr = resp->xdr;
3636         __be32 *p;
3637
3638         p = xdr_reserve_space(xdr, 8);
3639         if (!p)
3640                 return nfserr_resource;
3641         *p++ = cpu_to_be32(access->ac_supported);
3642         *p++ = cpu_to_be32(access->ac_resp_access);
3643         return 0;
3644 }
3645
3646 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3647 {
3648         struct xdr_stream *xdr = resp->xdr;
3649         __be32 *p;
3650
3651         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3652         if (!p)
3653                 return nfserr_resource;
3654         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3655                                         NFS4_MAX_SESSIONID_LEN);
3656         *p++ = cpu_to_be32(bcts->dir);
3657         /* Upshifting from TCP to RDMA is not supported */
3658         *p++ = cpu_to_be32(0);
3659         return 0;
3660 }
3661
3662 static __be32
3663 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3664 {
3665         struct xdr_stream *xdr = resp->xdr;
3666
3667         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3668 }
3669
3670
3671 static __be32
3672 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3673 {
3674         struct xdr_stream *xdr = resp->xdr;
3675         __be32 *p;
3676
3677         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3678         if (!p)
3679                 return nfserr_resource;
3680         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3681                                                 NFS4_VERIFIER_SIZE);
3682         return 0;
3683 }
3684
3685 static __be32
3686 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3687 {
3688         struct xdr_stream *xdr = resp->xdr;
3689         __be32 *p;
3690
3691         p = xdr_reserve_space(xdr, 20);
3692         if (!p)
3693                 return nfserr_resource;
3694         encode_cinfo(p, &create->cr_cinfo);
3695         return nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3696                         create->cr_bmval[1], create->cr_bmval[2]);
3697 }
3698
3699 static __be32
3700 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3701 {
3702         struct svc_fh *fhp = getattr->ga_fhp;
3703         struct xdr_stream *xdr = resp->xdr;
3704
3705         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3706                                     getattr->ga_bmval, resp->rqstp, 0);
3707 }
3708
3709 static __be32
3710 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3711 {
3712         struct xdr_stream *xdr = resp->xdr;
3713         struct svc_fh *fhp = *fhpp;
3714         unsigned int len;
3715         __be32 *p;
3716
3717         len = fhp->fh_handle.fh_size;
3718         p = xdr_reserve_space(xdr, len + 4);
3719         if (!p)
3720                 return nfserr_resource;
3721         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, len);
3722         return 0;
3723 }
3724
3725 /*
3726 * Including all fields other than the name, a LOCK4denied structure requires
3727 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3728 */
3729 static __be32
3730 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3731 {
3732         struct xdr_netobj *conf = &ld->ld_owner;
3733         __be32 *p;
3734
3735 again:
3736         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3737         if (!p) {
3738                 /*
3739                  * Don't fail to return the result just because we can't
3740                  * return the conflicting open:
3741                  */
3742                 if (conf->len) {
3743                         kfree(conf->data);
3744                         conf->len = 0;
3745                         conf->data = NULL;
3746                         goto again;
3747                 }
3748                 return nfserr_resource;
3749         }
3750         p = xdr_encode_hyper(p, ld->ld_start);
3751         p = xdr_encode_hyper(p, ld->ld_length);
3752         *p++ = cpu_to_be32(ld->ld_type);
3753         if (conf->len) {
3754                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3755                 p = xdr_encode_opaque(p, conf->data, conf->len);
3756                 kfree(conf->data);
3757         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3758                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3759                 *p++ = cpu_to_be32(0); /* length of owner name */
3760         }
3761         return nfserr_denied;
3762 }
3763
3764 static __be32
3765 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3766 {
3767         struct xdr_stream *xdr = resp->xdr;
3768
3769         if (!nfserr)
3770                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3771         else if (nfserr == nfserr_denied)
3772                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3773
3774         return nfserr;
3775 }
3776
3777 static __be32
3778 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3779 {
3780         struct xdr_stream *xdr = resp->xdr;
3781
3782         if (nfserr == nfserr_denied)
3783                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3784         return nfserr;
3785 }
3786
3787 static __be32
3788 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3789 {
3790         struct xdr_stream *xdr = resp->xdr;
3791
3792         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3793 }
3794
3795
3796 static __be32
3797 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3798 {
3799         struct xdr_stream *xdr = resp->xdr;
3800         __be32 *p;
3801
3802         p = xdr_reserve_space(xdr, 20);
3803         if (!p)
3804                 return nfserr_resource;
3805         p = encode_cinfo(p, &link->li_cinfo);
3806         return 0;
3807 }
3808
3809
3810 static __be32
3811 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3812 {
3813         struct xdr_stream *xdr = resp->xdr;
3814         __be32 *p;
3815
3816         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3817         if (nfserr)
3818                 return nfserr;
3819         p = xdr_reserve_space(xdr, 24);
3820         if (!p)
3821                 return nfserr_resource;
3822         p = encode_cinfo(p, &open->op_cinfo);
3823         *p++ = cpu_to_be32(open->op_rflags);
3824
3825         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3826                                         open->op_bmval[2]);
3827         if (nfserr)
3828                 return nfserr;
3829
3830         p = xdr_reserve_space(xdr, 4);
3831         if (!p)
3832                 return nfserr_resource;
3833
3834         *p++ = cpu_to_be32(open->op_delegate_type);
3835         switch (open->op_delegate_type) {
3836         case NFS4_OPEN_DELEGATE_NONE:
3837                 break;
3838         case NFS4_OPEN_DELEGATE_READ:
3839                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3840                 if (nfserr)
3841                         return nfserr;
3842                 p = xdr_reserve_space(xdr, 20);
3843                 if (!p)
3844                         return nfserr_resource;
3845                 *p++ = cpu_to_be32(open->op_recall);
3846
3847                 /*
3848                  * TODO: ACE's in delegations
3849                  */
3850                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3851                 *p++ = cpu_to_be32(0);
3852                 *p++ = cpu_to_be32(0);
3853                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3854                 break;
3855         case NFS4_OPEN_DELEGATE_WRITE:
3856                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3857                 if (nfserr)
3858                         return nfserr;
3859                 p = xdr_reserve_space(xdr, 32);
3860                 if (!p)
3861                         return nfserr_resource;
3862                 *p++ = cpu_to_be32(0);
3863
3864                 /*
3865                  * TODO: space_limit's in delegations
3866                  */
3867                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3868                 *p++ = cpu_to_be32(~(u32)0);
3869                 *p++ = cpu_to_be32(~(u32)0);
3870
3871                 /*
3872                  * TODO: ACE's in delegations
3873                  */
3874                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3875                 *p++ = cpu_to_be32(0);
3876                 *p++ = cpu_to_be32(0);
3877                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3878                 break;
3879         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3880                 switch (open->op_why_no_deleg) {
3881                 case WND4_CONTENTION:
3882                 case WND4_RESOURCE:
3883                         p = xdr_reserve_space(xdr, 8);
3884                         if (!p)
3885                                 return nfserr_resource;
3886                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3887                         /* deleg signaling not supported yet: */
3888                         *p++ = cpu_to_be32(0);
3889                         break;
3890                 default:
3891                         p = xdr_reserve_space(xdr, 4);
3892                         if (!p)
3893                                 return nfserr_resource;
3894                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3895                 }
3896                 break;
3897         default:
3898                 BUG();
3899         }
3900         /* XXX save filehandle here */
3901         return 0;
3902 }
3903
3904 static __be32
3905 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3906 {
3907         struct xdr_stream *xdr = resp->xdr;
3908
3909         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3910 }
3911
3912 static __be32
3913 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3914 {
3915         struct xdr_stream *xdr = resp->xdr;
3916
3917         return nfsd4_encode_stateid(xdr, &od->od_stateid);
3918 }
3919
3920 static __be32 nfsd4_encode_splice_read(
3921                                 struct nfsd4_compoundres *resp,
3922                                 struct nfsd4_read *read,
3923                                 struct file *file, unsigned long maxcount)
3924 {
3925         struct xdr_stream *xdr = resp->xdr;
3926         struct xdr_buf *buf = xdr->buf;
3927         int status, space_left;
3928         __be32 nfserr;
3929
3930         /* Make sure there will be room for padding if needed */
3931         if (xdr->end - xdr->p < 1)
3932                 return nfserr_resource;
3933
3934         nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3935                                   file, read->rd_offset, &maxcount,
3936                                   &read->rd_eof);
3937         read->rd_length = maxcount;
3938         if (nfserr)
3939                 goto out_err;
3940         status = svc_encode_result_payload(read->rd_rqstp,
3941                                            buf->head[0].iov_len, maxcount);
3942         if (status) {
3943                 nfserr = nfserrno(status);
3944                 goto out_err;
3945         }
3946
3947         buf->page_len = maxcount;
3948         buf->len += maxcount;
3949         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3950                                                         / PAGE_SIZE;
3951
3952         /* Use rest of head for padding and remaining ops: */
3953         buf->tail[0].iov_base = xdr->p;
3954         buf->tail[0].iov_len = 0;
3955         xdr->iov = buf->tail;
3956         if (maxcount&3) {
3957                 int pad = 4 - (maxcount&3);
3958
3959                 *(xdr->p++) = 0;
3960
3961                 buf->tail[0].iov_base += maxcount&3;
3962                 buf->tail[0].iov_len = pad;
3963                 buf->len += pad;
3964         }
3965
3966         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3967                                 buf->buflen - buf->len);
3968         buf->buflen = buf->len + space_left;
3969         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3970
3971         return 0;
3972
3973 out_err:
3974         /*
3975          * nfsd_splice_actor may have already messed with the
3976          * page length; reset it so as not to confuse
3977          * xdr_truncate_encode in our caller.
3978          */
3979         buf->page_len = 0;
3980         return nfserr;
3981 }
3982
3983 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3984                                  struct nfsd4_read *read,
3985                                  struct file *file, unsigned long maxcount)
3986 {
3987         struct xdr_stream *xdr = resp->xdr;
3988         unsigned int starting_len = xdr->buf->len;
3989         __be32 zero = xdr_zero;
3990         __be32 nfserr;
3991
3992         read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, maxcount);
3993         if (read->rd_vlen < 0)
3994                 return nfserr_resource;
3995
3996         nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3997                             resp->rqstp->rq_vec, read->rd_vlen, &maxcount,
3998                             &read->rd_eof);
3999         read->rd_length = maxcount;
4000         if (nfserr)
4001                 return nfserr;
4002         if (svc_encode_result_payload(resp->rqstp, starting_len, maxcount))
4003                 return nfserr_io;
4004         xdr_truncate_encode(xdr, starting_len + xdr_align_size(maxcount));
4005
4006         write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero,
4007                                xdr_pad_size(maxcount));
4008         return nfs_ok;
4009 }
4010
4011 static __be32
4012 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
4013                   struct nfsd4_read *read)
4014 {
4015         bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags);
4016         unsigned long maxcount;
4017         struct xdr_stream *xdr = resp->xdr;
4018         struct file *file;
4019         int starting_len = xdr->buf->len;
4020         __be32 *p;
4021
4022         if (nfserr)
4023                 return nfserr;
4024         file = read->rd_nf->nf_file;
4025
4026         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
4027         if (!p) {
4028                 WARN_ON_ONCE(splice_ok);
4029                 return nfserr_resource;
4030         }
4031         if (resp->xdr->buf->page_len && splice_ok) {
4032                 WARN_ON_ONCE(1);
4033                 return nfserr_serverfault;
4034         }
4035         xdr_commit_encode(xdr);
4036
4037         maxcount = min_t(unsigned long, read->rd_length,
4038                          (xdr->buf->buflen - xdr->buf->len));
4039
4040         if (file->f_op->splice_read && splice_ok)
4041                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4042         else
4043                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
4044         if (nfserr) {
4045                 xdr_truncate_encode(xdr, starting_len);
4046                 return nfserr;
4047         }
4048
4049         p = xdr_encode_bool(p, read->rd_eof);
4050         *p = cpu_to_be32(read->rd_length);
4051         return nfs_ok;
4052 }
4053
4054 static __be32
4055 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
4056 {
4057         __be32 *p, *maxcount_p, zero = xdr_zero;
4058         struct xdr_stream *xdr = resp->xdr;
4059         int length_offset = xdr->buf->len;
4060         int maxcount, status;
4061
4062         maxcount_p = xdr_reserve_space(xdr, XDR_UNIT);
4063         if (!maxcount_p)
4064                 return nfserr_resource;
4065         maxcount = PAGE_SIZE;
4066
4067         p = xdr_reserve_space(xdr, maxcount);
4068         if (!p)
4069                 return nfserr_resource;
4070         /*
4071          * XXX: By default, vfs_readlink() will truncate symlinks if they
4072          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
4073          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
4074          * that truncation occurred, and return NFS4ERR_RESOURCE.
4075          */
4076         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
4077                                                 (char *)p, &maxcount);
4078         if (nfserr == nfserr_isdir)
4079                 nfserr = nfserr_inval;
4080         if (nfserr)
4081                 goto out_err;
4082         status = svc_encode_result_payload(readlink->rl_rqstp, length_offset,
4083                                            maxcount);
4084         if (status) {
4085                 nfserr = nfserrno(status);
4086                 goto out_err;
4087         }
4088         *maxcount_p = cpu_to_be32(maxcount);
4089         xdr_truncate_encode(xdr, length_offset + 4 + xdr_align_size(maxcount));
4090         write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero,
4091                                xdr_pad_size(maxcount));
4092         return nfs_ok;
4093
4094 out_err:
4095         xdr_truncate_encode(xdr, length_offset);
4096         return nfserr;
4097 }
4098
4099 static __be32
4100 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
4101 {
4102         int maxcount;
4103         int bytes_left;
4104         loff_t offset;
4105         __be64 wire_offset;
4106         struct xdr_stream *xdr = resp->xdr;
4107         int starting_len = xdr->buf->len;
4108         __be32 *p;
4109
4110         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
4111         if (!p)
4112                 return nfserr_resource;
4113
4114         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
4115         *p++ = cpu_to_be32(0);
4116         *p++ = cpu_to_be32(0);
4117         xdr->buf->head[0].iov_len = (char *)xdr->p -
4118                                     (char *)xdr->buf->head[0].iov_base;
4119
4120         /*
4121          * Number of bytes left for directory entries allowing for the
4122          * final 8 bytes of the readdir and a following failed op:
4123          */
4124         bytes_left = xdr->buf->buflen - xdr->buf->len
4125                         - COMPOUND_ERR_SLACK_SPACE - 8;
4126         if (bytes_left < 0) {
4127                 nfserr = nfserr_resource;
4128                 goto err_no_verf;
4129         }
4130         maxcount = svc_max_payload(resp->rqstp);
4131         maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
4132         /*
4133          * Note the rfc defines rd_maxcount as the size of the
4134          * READDIR4resok structure, which includes the verifier above
4135          * and the 8 bytes encoded at the end of this function:
4136          */
4137         if (maxcount < 16) {
4138                 nfserr = nfserr_toosmall;
4139                 goto err_no_verf;
4140         }
4141         maxcount = min_t(int, maxcount-16, bytes_left);
4142
4143         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
4144         if (!readdir->rd_dircount)
4145                 readdir->rd_dircount = svc_max_payload(resp->rqstp);
4146
4147         readdir->xdr = xdr;
4148         readdir->rd_maxcount = maxcount;
4149         readdir->common.err = 0;
4150         readdir->cookie_offset = 0;
4151
4152         offset = readdir->rd_cookie;
4153         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
4154                               &offset,
4155                               &readdir->common, nfsd4_encode_dirent);
4156         if (nfserr == nfs_ok &&
4157             readdir->common.err == nfserr_toosmall &&
4158             xdr->buf->len == starting_len + 8) {
4159                 /* nothing encoded; which limit did we hit?: */
4160                 if (maxcount - 16 < bytes_left)
4161                         /* It was the fault of rd_maxcount: */
4162                         nfserr = nfserr_toosmall;
4163                 else
4164                         /* We ran out of buffer space: */
4165                         nfserr = nfserr_resource;
4166         }
4167         if (nfserr)
4168                 goto err_no_verf;
4169
4170         if (readdir->cookie_offset) {
4171                 wire_offset = cpu_to_be64(offset);
4172                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
4173                                                         &wire_offset, 8);
4174         }
4175
4176         p = xdr_reserve_space(xdr, 8);
4177         if (!p) {
4178                 WARN_ON_ONCE(1);
4179                 goto err_no_verf;
4180         }
4181         *p++ = 0;       /* no more entries */
4182         *p++ = htonl(readdir->common.err == nfserr_eof);
4183
4184         return 0;
4185 err_no_verf:
4186         xdr_truncate_encode(xdr, starting_len);
4187         return nfserr;
4188 }
4189
4190 static __be32
4191 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
4192 {
4193         struct xdr_stream *xdr = resp->xdr;
4194         __be32 *p;
4195
4196         p = xdr_reserve_space(xdr, 20);
4197         if (!p)
4198                 return nfserr_resource;
4199         p = encode_cinfo(p, &remove->rm_cinfo);
4200         return 0;
4201 }
4202
4203 static __be32
4204 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
4205 {
4206         struct xdr_stream *xdr = resp->xdr;
4207         __be32 *p;
4208
4209         p = xdr_reserve_space(xdr, 40);
4210         if (!p)
4211                 return nfserr_resource;
4212         p = encode_cinfo(p, &rename->rn_sinfo);
4213         p = encode_cinfo(p, &rename->rn_tinfo);
4214         return 0;
4215 }
4216
4217 static __be32
4218 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
4219 {
4220         u32 i, nflavs, supported;
4221         struct exp_flavor_info *flavs;
4222         struct exp_flavor_info def_flavs[2];
4223         __be32 *p, *flavorsp;
4224         static bool report = true;
4225
4226         if (exp->ex_nflavors) {
4227                 flavs = exp->ex_flavors;
4228                 nflavs = exp->ex_nflavors;
4229         } else { /* Handling of some defaults in absence of real secinfo: */
4230                 flavs = def_flavs;
4231                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
4232                         nflavs = 2;
4233                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
4234                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
4235                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
4236                         nflavs = 1;
4237                         flavs[0].pseudoflavor
4238                                         = svcauth_gss_flavor(exp->ex_client);
4239                 } else {
4240                         nflavs = 1;
4241                         flavs[0].pseudoflavor
4242                                         = exp->ex_client->flavour->flavour;
4243                 }
4244         }
4245
4246         supported = 0;
4247         p = xdr_reserve_space(xdr, 4);
4248         if (!p)
4249                 return nfserr_resource;
4250         flavorsp = p++;         /* to be backfilled later */
4251
4252         for (i = 0; i < nflavs; i++) {
4253                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
4254                 struct rpcsec_gss_info info;
4255
4256                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
4257                         supported++;
4258                         p = xdr_reserve_space(xdr, 4 + 4 +
4259                                               XDR_LEN(info.oid.len) + 4 + 4);
4260                         if (!p)
4261                                 return nfserr_resource;
4262                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
4263                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
4264                         *p++ = cpu_to_be32(info.qop);
4265                         *p++ = cpu_to_be32(info.service);
4266                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
4267                         supported++;
4268                         p = xdr_reserve_space(xdr, 4);
4269                         if (!p)
4270                                 return nfserr_resource;
4271                         *p++ = cpu_to_be32(pf);
4272                 } else {
4273                         if (report)
4274                                 pr_warn("NFS: SECINFO: security flavor %u "
4275                                         "is not supported\n", pf);
4276                 }
4277         }
4278
4279         if (nflavs != supported)
4280                 report = false;
4281         *flavorsp = htonl(supported);
4282         return 0;
4283 }
4284
4285 static __be32
4286 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4287                      struct nfsd4_secinfo *secinfo)
4288 {
4289         struct xdr_stream *xdr = resp->xdr;
4290
4291         return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
4292 }
4293
4294 static __be32
4295 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
4296                      struct nfsd4_secinfo_no_name *secinfo)
4297 {
4298         struct xdr_stream *xdr = resp->xdr;
4299
4300         return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
4301 }
4302
4303 /*
4304  * The SETATTR encode routine is special -- it always encodes a bitmap,
4305  * regardless of the error status.
4306  */
4307 static __be32
4308 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
4309 {
4310         struct xdr_stream *xdr = resp->xdr;
4311         __be32 *p;
4312
4313         p = xdr_reserve_space(xdr, 16);
4314         if (!p)
4315                 return nfserr_resource;
4316         if (nfserr) {
4317                 *p++ = cpu_to_be32(3);
4318                 *p++ = cpu_to_be32(0);
4319                 *p++ = cpu_to_be32(0);
4320                 *p++ = cpu_to_be32(0);
4321         }
4322         else {
4323                 *p++ = cpu_to_be32(3);
4324                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
4325                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
4326                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
4327         }
4328         return nfserr;
4329 }
4330
4331 static __be32
4332 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
4333 {
4334         struct xdr_stream *xdr = resp->xdr;
4335         __be32 *p;
4336
4337         if (!nfserr) {
4338                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
4339                 if (!p)
4340                         return nfserr_resource;
4341                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
4342                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
4343                                                 NFS4_VERIFIER_SIZE);
4344         }
4345         else if (nfserr == nfserr_clid_inuse) {
4346                 p = xdr_reserve_space(xdr, 8);
4347                 if (!p)
4348                         return nfserr_resource;
4349                 *p++ = cpu_to_be32(0);
4350                 *p++ = cpu_to_be32(0);
4351         }
4352         return nfserr;
4353 }
4354
4355 static __be32
4356 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
4357 {
4358         struct xdr_stream *xdr = resp->xdr;
4359         __be32 *p;
4360
4361         p = xdr_reserve_space(xdr, 16);
4362         if (!p)
4363                 return nfserr_resource;
4364         *p++ = cpu_to_be32(write->wr_bytes_written);
4365         *p++ = cpu_to_be32(write->wr_how_written);
4366         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4367                                                 NFS4_VERIFIER_SIZE);
4368         return 0;
4369 }
4370
4371 static __be32
4372 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
4373                          struct nfsd4_exchange_id *exid)
4374 {
4375         struct xdr_stream *xdr = resp->xdr;
4376         __be32 *p;
4377         char *major_id;
4378         char *server_scope;
4379         int major_id_sz;
4380         int server_scope_sz;
4381         uint64_t minor_id = 0;
4382         struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
4383
4384         major_id = nn->nfsd_name;
4385         major_id_sz = strlen(nn->nfsd_name);
4386         server_scope = nn->nfsd_name;
4387         server_scope_sz = strlen(nn->nfsd_name);
4388
4389         p = xdr_reserve_space(xdr,
4390                 8 /* eir_clientid */ +
4391                 4 /* eir_sequenceid */ +
4392                 4 /* eir_flags */ +
4393                 4 /* spr_how */);
4394         if (!p)
4395                 return nfserr_resource;
4396
4397         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
4398         *p++ = cpu_to_be32(exid->seqid);
4399         *p++ = cpu_to_be32(exid->flags);
4400
4401         *p++ = cpu_to_be32(exid->spa_how);
4402
4403         switch (exid->spa_how) {
4404         case SP4_NONE:
4405                 break;
4406         case SP4_MACH_CRED:
4407                 /* spo_must_enforce bitmap: */
4408                 nfserr = nfsd4_encode_bitmap(xdr,
4409                                         exid->spo_must_enforce[0],
4410                                         exid->spo_must_enforce[1],
4411                                         exid->spo_must_enforce[2]);
4412                 if (nfserr)
4413                         return nfserr;
4414                 /* spo_must_allow bitmap: */
4415                 nfserr = nfsd4_encode_bitmap(xdr,
4416                                         exid->spo_must_allow[0],
4417                                         exid->spo_must_allow[1],
4418                                         exid->spo_must_allow[2]);
4419                 if (nfserr)
4420                         return nfserr;
4421                 break;
4422         default:
4423                 WARN_ON_ONCE(1);
4424         }
4425
4426         p = xdr_reserve_space(xdr,
4427                 8 /* so_minor_id */ +
4428                 4 /* so_major_id.len */ +
4429                 (XDR_QUADLEN(major_id_sz) * 4) +
4430                 4 /* eir_server_scope.len */ +
4431                 (XDR_QUADLEN(server_scope_sz) * 4) +
4432                 4 /* eir_server_impl_id.count (0) */);
4433         if (!p)
4434                 return nfserr_resource;
4435
4436         /* The server_owner struct */
4437         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
4438         /* major id */
4439         p = xdr_encode_opaque(p, major_id, major_id_sz);
4440
4441         /* Server scope */
4442         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4443
4444         /* Implementation id */
4445         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
4446         return 0;
4447 }
4448
4449 static __be32
4450 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4451                             struct nfsd4_create_session *sess)
4452 {
4453         struct xdr_stream *xdr = resp->xdr;
4454         __be32 *p;
4455
4456         p = xdr_reserve_space(xdr, 24);
4457         if (!p)
4458                 return nfserr_resource;
4459         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4460                                         NFS4_MAX_SESSIONID_LEN);
4461         *p++ = cpu_to_be32(sess->seqid);
4462         *p++ = cpu_to_be32(sess->flags);
4463
4464         p = xdr_reserve_space(xdr, 28);
4465         if (!p)
4466                 return nfserr_resource;
4467         *p++ = cpu_to_be32(0); /* headerpadsz */
4468         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4469         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4470         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4471         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4472         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4473         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4474
4475         if (sess->fore_channel.nr_rdma_attrs) {
4476                 p = xdr_reserve_space(xdr, 4);
4477                 if (!p)
4478                         return nfserr_resource;
4479                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4480         }
4481
4482         p = xdr_reserve_space(xdr, 28);
4483         if (!p)
4484                 return nfserr_resource;
4485         *p++ = cpu_to_be32(0); /* headerpadsz */
4486         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4487         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4488         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4489         *p++ = cpu_to_be32(sess->back_channel.maxops);
4490         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4491         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4492
4493         if (sess->back_channel.nr_rdma_attrs) {
4494                 p = xdr_reserve_space(xdr, 4);
4495                 if (!p)
4496                         return nfserr_resource;
4497                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4498         }
4499         return 0;
4500 }
4501
4502 static __be32
4503 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4504                       struct nfsd4_sequence *seq)
4505 {
4506         struct xdr_stream *xdr = resp->xdr;
4507         __be32 *p;
4508
4509         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4510         if (!p)
4511                 return nfserr_resource;
4512         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4513                                         NFS4_MAX_SESSIONID_LEN);
4514         *p++ = cpu_to_be32(seq->seqid);
4515         *p++ = cpu_to_be32(seq->slotid);
4516         /* Note slotid's are numbered from zero: */
4517         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4518         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4519         *p++ = cpu_to_be32(seq->status_flags);
4520
4521         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4522         return 0;
4523 }
4524
4525 static __be32
4526 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4527                           struct nfsd4_test_stateid *test_stateid)
4528 {
4529         struct xdr_stream *xdr = resp->xdr;
4530         struct nfsd4_test_stateid_id *stateid, *next;
4531         __be32 *p;
4532
4533         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4534         if (!p)
4535                 return nfserr_resource;
4536         *p++ = htonl(test_stateid->ts_num_ids);
4537
4538         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4539                 *p++ = stateid->ts_id_status;
4540         }
4541
4542         return 0;
4543 }
4544
4545 #ifdef CONFIG_NFSD_PNFS
4546 static __be32
4547 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4548                 struct nfsd4_getdeviceinfo *gdev)
4549 {
4550         struct xdr_stream *xdr = resp->xdr;
4551         const struct nfsd4_layout_ops *ops;
4552         u32 starting_len = xdr->buf->len, needed_len;
4553         __be32 *p;
4554
4555         p = xdr_reserve_space(xdr, 4);
4556         if (!p)
4557                 return nfserr_resource;
4558
4559         *p++ = cpu_to_be32(gdev->gd_layout_type);
4560
4561         /* If maxcount is 0 then just update notifications */
4562         if (gdev->gd_maxcount != 0) {
4563                 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4564                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4565                 if (nfserr) {
4566                         /*
4567                          * We don't bother to burden the layout drivers with
4568                          * enforcing gd_maxcount, just tell the client to
4569                          * come back with a bigger buffer if it's not enough.
4570                          */
4571                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4572                                 goto toosmall;
4573                         return nfserr;
4574                 }
4575         }
4576
4577         if (gdev->gd_notify_types) {
4578                 p = xdr_reserve_space(xdr, 4 + 4);
4579                 if (!p)
4580                         return nfserr_resource;
4581                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4582                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4583         } else {
4584                 p = xdr_reserve_space(xdr, 4);
4585                 if (!p)
4586                         return nfserr_resource;
4587                 *p++ = 0;
4588         }
4589
4590         return 0;
4591 toosmall:
4592         dprintk("%s: maxcount too small\n", __func__);
4593         needed_len = xdr->buf->len + 4 /* notifications */;
4594         xdr_truncate_encode(xdr, starting_len);
4595         p = xdr_reserve_space(xdr, 4);
4596         if (!p)
4597                 return nfserr_resource;
4598         *p++ = cpu_to_be32(needed_len);
4599         return nfserr_toosmall;
4600 }
4601
4602 static __be32
4603 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4604                 struct nfsd4_layoutget *lgp)
4605 {
4606         struct xdr_stream *xdr = resp->xdr;
4607         const struct nfsd4_layout_ops *ops;
4608         __be32 *p;
4609
4610         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4611         if (!p)
4612                 return nfserr_resource;
4613
4614         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4615         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4616         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4617                                     sizeof(stateid_opaque_t));
4618
4619         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4620         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4621         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4622         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4623         *p++ = cpu_to_be32(lgp->lg_layout_type);
4624
4625         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4626         return ops->encode_layoutget(xdr, lgp);
4627 }
4628
4629 static __be32
4630 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4631                           struct nfsd4_layoutcommit *lcp)
4632 {
4633         struct xdr_stream *xdr = resp->xdr;
4634         __be32 *p;
4635
4636         p = xdr_reserve_space(xdr, 4);
4637         if (!p)
4638                 return nfserr_resource;
4639         *p++ = cpu_to_be32(lcp->lc_size_chg);
4640         if (lcp->lc_size_chg) {
4641                 p = xdr_reserve_space(xdr, 8);
4642                 if (!p)
4643                         return nfserr_resource;
4644                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4645         }
4646
4647         return 0;
4648 }
4649
4650 static __be32
4651 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4652                 struct nfsd4_layoutreturn *lrp)
4653 {
4654         struct xdr_stream *xdr = resp->xdr;
4655         __be32 *p;
4656
4657         p = xdr_reserve_space(xdr, 4);
4658         if (!p)
4659                 return nfserr_resource;
4660         *p++ = cpu_to_be32(lrp->lrs_present);
4661         if (lrp->lrs_present)
4662                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4663         return 0;
4664 }
4665 #endif /* CONFIG_NFSD_PNFS */
4666
4667 static __be32
4668 nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
4669                 struct nfsd42_write_res *write, bool sync)
4670 {
4671         __be32 *p;
4672         p = xdr_reserve_space(resp->xdr, 4);
4673         if (!p)
4674                 return nfserr_resource;
4675
4676         if (sync)
4677                 *p++ = cpu_to_be32(0);
4678         else {
4679                 __be32 nfserr;
4680                 *p++ = cpu_to_be32(1);
4681                 nfserr = nfsd4_encode_stateid(resp->xdr, &write->cb_stateid);
4682                 if (nfserr)
4683                         return nfserr;
4684         }
4685         p = xdr_reserve_space(resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
4686         if (!p)
4687                 return nfserr_resource;
4688
4689         p = xdr_encode_hyper(p, write->wr_bytes_written);
4690         *p++ = cpu_to_be32(write->wr_stable_how);
4691         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4692                                     NFS4_VERIFIER_SIZE);
4693         return nfs_ok;
4694 }
4695
4696 static __be32
4697 nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns)
4698 {
4699         struct xdr_stream *xdr = resp->xdr;
4700         struct nfs42_netaddr *addr;
4701         __be32 *p;
4702
4703         p = xdr_reserve_space(xdr, 4);
4704         *p++ = cpu_to_be32(ns->nl4_type);
4705
4706         switch (ns->nl4_type) {
4707         case NL4_NETADDR:
4708                 addr = &ns->u.nl4_addr;
4709
4710                 /* netid_len, netid, uaddr_len, uaddr (port included
4711                  * in RPCBIND_MAXUADDRLEN)
4712                  */
4713                 p = xdr_reserve_space(xdr,
4714                         4 /* netid len */ +
4715                         (XDR_QUADLEN(addr->netid_len) * 4) +
4716                         4 /* uaddr len */ +
4717                         (XDR_QUADLEN(addr->addr_len) * 4));
4718                 if (!p)
4719                         return nfserr_resource;
4720
4721                 *p++ = cpu_to_be32(addr->netid_len);
4722                 p = xdr_encode_opaque_fixed(p, addr->netid,
4723                                             addr->netid_len);
4724                 *p++ = cpu_to_be32(addr->addr_len);
4725                 p = xdr_encode_opaque_fixed(p, addr->addr,
4726                                         addr->addr_len);
4727                 break;
4728         default:
4729                 WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR);
4730                 return nfserr_inval;
4731         }
4732
4733         return 0;
4734 }
4735
4736 static __be32
4737 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4738                   struct nfsd4_copy *copy)
4739 {
4740         __be32 *p;
4741
4742         nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
4743                                          nfsd4_copy_is_sync(copy));
4744         if (nfserr)
4745                 return nfserr;
4746
4747         p = xdr_reserve_space(resp->xdr, 4 + 4);
4748         *p++ = xdr_one; /* cr_consecutive */
4749         *p = nfsd4_copy_is_sync(copy) ? xdr_one : xdr_zero;
4750         return 0;
4751 }
4752
4753 static __be32
4754 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
4755                             struct nfsd4_offload_status *os)
4756 {
4757         struct xdr_stream *xdr = resp->xdr;
4758         __be32 *p;
4759
4760         p = xdr_reserve_space(xdr, 8 + 4);
4761         if (!p)
4762                 return nfserr_resource;
4763         p = xdr_encode_hyper(p, os->count);
4764         *p++ = cpu_to_be32(0);
4765         return nfserr;
4766 }
4767
4768 static __be32
4769 nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
4770                             struct nfsd4_read *read,
4771                             unsigned long *maxcount, u32 *eof,
4772                             loff_t *pos)
4773 {
4774         struct xdr_stream *xdr = resp->xdr;
4775         struct file *file = read->rd_nf->nf_file;
4776         int starting_len = xdr->buf->len;
4777         loff_t hole_pos;
4778         __be32 nfserr;
4779         __be32 *p, tmp;
4780         __be64 tmp64;
4781
4782         hole_pos = pos ? *pos : vfs_llseek(file, read->rd_offset, SEEK_HOLE);
4783         if (hole_pos > read->rd_offset)
4784                 *maxcount = min_t(unsigned long, *maxcount, hole_pos - read->rd_offset);
4785         *maxcount = min_t(unsigned long, *maxcount, (xdr->buf->buflen - xdr->buf->len));
4786
4787         /* Content type, offset, byte count */
4788         p = xdr_reserve_space(xdr, 4 + 8 + 4);
4789         if (!p)
4790                 return nfserr_resource;
4791
4792         read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, *maxcount);
4793         if (read->rd_vlen < 0)
4794                 return nfserr_resource;
4795
4796         nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
4797                             resp->rqstp->rq_vec, read->rd_vlen, maxcount, eof);
4798         if (nfserr)
4799                 return nfserr;
4800         xdr_truncate_encode(xdr, starting_len + 16 + xdr_align_size(*maxcount));
4801
4802         tmp = htonl(NFS4_CONTENT_DATA);
4803         write_bytes_to_xdr_buf(xdr->buf, starting_len,      &tmp,   4);
4804         tmp64 = cpu_to_be64(read->rd_offset);
4805         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4,  &tmp64, 8);
4806         tmp = htonl(*maxcount);
4807         write_bytes_to_xdr_buf(xdr->buf, starting_len + 12, &tmp,   4);
4808
4809         tmp = xdr_zero;
4810         write_bytes_to_xdr_buf(xdr->buf, starting_len + 16 + *maxcount, &tmp,
4811                                xdr_pad_size(*maxcount));
4812         return nfs_ok;
4813 }
4814
4815 static __be32
4816 nfsd4_encode_read_plus_hole(struct nfsd4_compoundres *resp,
4817                             struct nfsd4_read *read,
4818                             unsigned long *maxcount, u32 *eof)
4819 {
4820         struct file *file = read->rd_nf->nf_file;
4821         loff_t data_pos = vfs_llseek(file, read->rd_offset, SEEK_DATA);
4822         loff_t f_size = i_size_read(file_inode(file));
4823         unsigned long count;
4824         __be32 *p;
4825
4826         if (data_pos == -ENXIO)
4827                 data_pos = f_size;
4828         else if (data_pos <= read->rd_offset || (data_pos < f_size && data_pos % PAGE_SIZE))
4829                 return nfsd4_encode_read_plus_data(resp, read, maxcount, eof, &f_size);
4830         count = data_pos - read->rd_offset;
4831
4832         /* Content type, offset, byte count */
4833         p = xdr_reserve_space(resp->xdr, 4 + 8 + 8);
4834         if (!p)
4835                 return nfserr_resource;
4836
4837         *p++ = htonl(NFS4_CONTENT_HOLE);
4838         p = xdr_encode_hyper(p, read->rd_offset);
4839         p = xdr_encode_hyper(p, count);
4840
4841         *eof = (read->rd_offset + count) >= f_size;
4842         *maxcount = min_t(unsigned long, count, *maxcount);
4843         return nfs_ok;
4844 }
4845
4846 static __be32
4847 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
4848                        struct nfsd4_read *read)
4849 {
4850         unsigned long maxcount, count;
4851         struct xdr_stream *xdr = resp->xdr;
4852         struct file *file;
4853         int starting_len = xdr->buf->len;
4854         int last_segment = xdr->buf->len;
4855         int segments = 0;
4856         __be32 *p, tmp;
4857         bool is_data;
4858         loff_t pos;
4859         u32 eof;
4860
4861         if (nfserr)
4862                 return nfserr;
4863         file = read->rd_nf->nf_file;
4864
4865         /* eof flag, segment count */
4866         p = xdr_reserve_space(xdr, 4 + 4);
4867         if (!p)
4868                 return nfserr_resource;
4869         xdr_commit_encode(xdr);
4870
4871         maxcount = min_t(unsigned long, read->rd_length,
4872                          (xdr->buf->buflen - xdr->buf->len));
4873         count    = maxcount;
4874
4875         eof = read->rd_offset >= i_size_read(file_inode(file));
4876         if (eof)
4877                 goto out;
4878
4879         pos = vfs_llseek(file, read->rd_offset, SEEK_HOLE);
4880         is_data = pos > read->rd_offset;
4881
4882         while (count > 0 && !eof) {
4883                 maxcount = count;
4884                 if (is_data)
4885                         nfserr = nfsd4_encode_read_plus_data(resp, read, &maxcount, &eof,
4886                                                 segments == 0 ? &pos : NULL);
4887                 else
4888                         nfserr = nfsd4_encode_read_plus_hole(resp, read, &maxcount, &eof);
4889                 if (nfserr)
4890                         goto out;
4891                 count -= maxcount;
4892                 read->rd_offset += maxcount;
4893                 is_data = !is_data;
4894                 last_segment = xdr->buf->len;
4895                 segments++;
4896         }
4897
4898 out:
4899         if (nfserr && segments == 0)
4900                 xdr_truncate_encode(xdr, starting_len);
4901         else {
4902                 if (nfserr) {
4903                         xdr_truncate_encode(xdr, last_segment);
4904                         nfserr = nfs_ok;
4905                         eof = 0;
4906                 }
4907                 tmp = htonl(eof);
4908                 write_bytes_to_xdr_buf(xdr->buf, starting_len,     &tmp, 4);
4909                 tmp = htonl(segments);
4910                 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
4911         }
4912
4913         return nfserr;
4914 }
4915
4916 static __be32
4917 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
4918                          struct nfsd4_copy_notify *cn)
4919 {
4920         struct xdr_stream *xdr = resp->xdr;
4921         __be32 *p;
4922
4923         if (nfserr)
4924                 return nfserr;
4925
4926         /* 8 sec, 4 nsec */
4927         p = xdr_reserve_space(xdr, 12);
4928         if (!p)
4929                 return nfserr_resource;
4930
4931         /* cnr_lease_time */
4932         p = xdr_encode_hyper(p, cn->cpn_sec);
4933         *p++ = cpu_to_be32(cn->cpn_nsec);
4934
4935         /* cnr_stateid */
4936         nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid);
4937         if (nfserr)
4938                 return nfserr;
4939
4940         /* cnr_src.nl_nsvr */
4941         p = xdr_reserve_space(xdr, 4);
4942         if (!p)
4943                 return nfserr_resource;
4944
4945         *p++ = cpu_to_be32(1);
4946
4947         nfserr = nfsd42_encode_nl4_server(resp, cn->cpn_src);
4948         return nfserr;
4949 }
4950
4951 static __be32
4952 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4953                   struct nfsd4_seek *seek)
4954 {
4955         __be32 *p;
4956
4957         p = xdr_reserve_space(resp->xdr, 4 + 8);
4958         *p++ = cpu_to_be32(seek->seek_eof);
4959         p = xdr_encode_hyper(p, seek->seek_pos);
4960
4961         return 0;
4962 }
4963
4964 static __be32
4965 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4966 {
4967         return nfserr;
4968 }
4969
4970 /*
4971  * Encode kmalloc-ed buffer in to XDR stream.
4972  */
4973 static __be32
4974 nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
4975 {
4976         u32 cplen;
4977         __be32 *p;
4978
4979         cplen = min_t(unsigned long, buflen,
4980                       ((void *)xdr->end - (void *)xdr->p));
4981         p = xdr_reserve_space(xdr, cplen);
4982         if (!p)
4983                 return nfserr_resource;
4984
4985         memcpy(p, buf, cplen);
4986         buf += cplen;
4987         buflen -= cplen;
4988
4989         while (buflen) {
4990                 cplen = min_t(u32, buflen, PAGE_SIZE);
4991                 p = xdr_reserve_space(xdr, cplen);
4992                 if (!p)
4993                         return nfserr_resource;
4994
4995                 memcpy(p, buf, cplen);
4996
4997                 if (cplen < PAGE_SIZE) {
4998                         /*
4999                          * We're done, with a length that wasn't page
5000                          * aligned, so possibly not word aligned. Pad
5001                          * any trailing bytes with 0.
5002                          */
5003                         xdr_encode_opaque_fixed(p, NULL, cplen);
5004                         break;
5005                 }
5006
5007                 buflen -= PAGE_SIZE;
5008                 buf += PAGE_SIZE;
5009         }
5010
5011         return 0;
5012 }
5013
5014 static __be32
5015 nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5016                       struct nfsd4_getxattr *getxattr)
5017 {
5018         struct xdr_stream *xdr = resp->xdr;
5019         __be32 *p, err;
5020
5021         p = xdr_reserve_space(xdr, 4);
5022         if (!p)
5023                 return nfserr_resource;
5024
5025         *p = cpu_to_be32(getxattr->getxa_len);
5026
5027         if (getxattr->getxa_len == 0)
5028                 return 0;
5029
5030         err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf,
5031                                     getxattr->getxa_len);
5032
5033         kvfree(getxattr->getxa_buf);
5034
5035         return err;
5036 }
5037
5038 static __be32
5039 nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5040                       struct nfsd4_setxattr *setxattr)
5041 {
5042         struct xdr_stream *xdr = resp->xdr;
5043         __be32 *p;
5044
5045         p = xdr_reserve_space(xdr, 20);
5046         if (!p)
5047                 return nfserr_resource;
5048
5049         encode_cinfo(p, &setxattr->setxa_cinfo);
5050
5051         return 0;
5052 }
5053
5054 /*
5055  * See if there are cookie values that can be rejected outright.
5056  */
5057 static __be32
5058 nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
5059                                 u32 *offsetp)
5060 {
5061         u64 cookie = listxattrs->lsxa_cookie;
5062
5063         /*
5064          * If the cookie is larger than the maximum number we can fit
5065          * in either the buffer we just got back from vfs_listxattr, or,
5066          * XDR-encoded, in the return buffer, it's invalid.
5067          */
5068         if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
5069                 return nfserr_badcookie;
5070
5071         if (cookie > (listxattrs->lsxa_maxcount /
5072                       (XDR_QUADLEN(XATTR_USER_PREFIX_LEN + 2) + 4)))
5073                 return nfserr_badcookie;
5074
5075         *offsetp = (u32)cookie;
5076         return 0;
5077 }
5078
5079 static __be32
5080 nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
5081                         struct nfsd4_listxattrs *listxattrs)
5082 {
5083         struct xdr_stream *xdr = resp->xdr;
5084         u32 cookie_offset, count_offset, eof;
5085         u32 left, xdrleft, slen, count;
5086         u32 xdrlen, offset;
5087         u64 cookie;
5088         char *sp;
5089         __be32 status, tmp;
5090         __be32 *p;
5091         u32 nuser;
5092
5093         eof = 1;
5094
5095         status = nfsd4_listxattr_validate_cookie(listxattrs, &offset);
5096         if (status)
5097                 goto out;
5098
5099         /*
5100          * Reserve space for the cookie and the name array count. Record
5101          * the offsets to save them later.
5102          */
5103         cookie_offset = xdr->buf->len;
5104         count_offset = cookie_offset + 8;
5105         p = xdr_reserve_space(xdr, 12);
5106         if (!p) {
5107                 status = nfserr_resource;
5108                 goto out;
5109         }
5110
5111         count = 0;
5112         left = listxattrs->lsxa_len;
5113         sp = listxattrs->lsxa_buf;
5114         nuser = 0;
5115
5116         xdrleft = listxattrs->lsxa_maxcount;
5117
5118         while (left > 0 && xdrleft > 0) {
5119                 slen = strlen(sp);
5120
5121                 /*
5122                  * Check if this is a "user." attribute, skip it if not.
5123                  */
5124                 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
5125                         goto contloop;
5126
5127                 slen -= XATTR_USER_PREFIX_LEN;
5128                 xdrlen = 4 + ((slen + 3) & ~3);
5129                 if (xdrlen > xdrleft) {
5130                         if (count == 0) {
5131                                 /*
5132                                  * Can't even fit the first attribute name.
5133                                  */
5134                                 status = nfserr_toosmall;
5135                                 goto out;
5136                         }
5137                         eof = 0;
5138                         goto wreof;
5139                 }
5140
5141                 left -= XATTR_USER_PREFIX_LEN;
5142                 sp += XATTR_USER_PREFIX_LEN;
5143                 if (nuser++ < offset)
5144                         goto contloop;
5145
5146
5147                 p = xdr_reserve_space(xdr, xdrlen);
5148                 if (!p) {
5149                         status = nfserr_resource;
5150                         goto out;
5151                 }
5152
5153                 xdr_encode_opaque(p, sp, slen);
5154
5155                 xdrleft -= xdrlen;
5156                 count++;
5157 contloop:
5158                 sp += slen + 1;
5159                 left -= slen + 1;
5160         }
5161
5162         /*
5163          * If there were user attributes to copy, but we didn't copy
5164          * any, the offset was too large (e.g. the cookie was invalid).
5165          */
5166         if (nuser > 0 && count == 0) {
5167                 status = nfserr_badcookie;
5168                 goto out;
5169         }
5170
5171 wreof:
5172         p = xdr_reserve_space(xdr, 4);
5173         if (!p) {
5174                 status = nfserr_resource;
5175                 goto out;
5176         }
5177         *p = cpu_to_be32(eof);
5178
5179         cookie = offset + count;
5180
5181         write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &cookie, 8);
5182         tmp = cpu_to_be32(count);
5183         write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4);
5184 out:
5185         if (listxattrs->lsxa_len)
5186                 kvfree(listxattrs->lsxa_buf);
5187         return status;
5188 }
5189
5190 static __be32
5191 nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5192                          struct nfsd4_removexattr *removexattr)
5193 {
5194         struct xdr_stream *xdr = resp->xdr;
5195         __be32 *p;
5196
5197         p = xdr_reserve_space(xdr, 20);
5198         if (!p)
5199                 return nfserr_resource;
5200
5201         p = encode_cinfo(p, &removexattr->rmxa_cinfo);
5202         return 0;
5203 }
5204
5205 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
5206
5207 /*
5208  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
5209  * since we don't need to filter out obsolete ops as this is
5210  * done in the decoding phase.
5211  */
5212 static const nfsd4_enc nfsd4_enc_ops[] = {
5213         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
5214         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
5215         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
5216         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
5217         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
5218         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
5219         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
5220         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
5221         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
5222         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
5223         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
5224         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
5225         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
5226         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
5227         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
5228         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
5229         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
5230         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
5231         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
5232         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
5233         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
5234         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
5235         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
5236         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
5237         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
5238         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
5239         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
5240         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
5241         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
5242         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
5243         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
5244         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
5245         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
5246         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
5247         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
5248         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
5249         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
5250
5251         /* NFSv4.1 operations */
5252         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
5253         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
5254         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
5255         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
5256         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
5257         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
5258         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
5259 #ifdef CONFIG_NFSD_PNFS
5260         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
5261         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
5262         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
5263         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
5264         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
5265 #else
5266         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
5267         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
5268         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
5269         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
5270         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
5271 #endif
5272         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
5273         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
5274         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
5275         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
5276         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
5277         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
5278         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
5279
5280         /* NFSv4.2 operations */
5281         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
5282         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
5283         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_copy_notify,
5284         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
5285         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
5286         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
5287         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
5288         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
5289         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_offload_status,
5290         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_read_plus,
5291         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
5292         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
5293         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
5294
5295         /* RFC 8276 extended atributes operations */
5296         [OP_GETXATTR]           = (nfsd4_enc)nfsd4_encode_getxattr,
5297         [OP_SETXATTR]           = (nfsd4_enc)nfsd4_encode_setxattr,
5298         [OP_LISTXATTRS]         = (nfsd4_enc)nfsd4_encode_listxattrs,
5299         [OP_REMOVEXATTR]        = (nfsd4_enc)nfsd4_encode_removexattr,
5300 };
5301
5302 /*
5303  * Calculate whether we still have space to encode repsize bytes.
5304  * There are two considerations:
5305  *     - For NFS versions >=4.1, the size of the reply must stay within
5306  *       session limits
5307  *     - For all NFS versions, we must stay within limited preallocated
5308  *       buffer space.
5309  *
5310  * This is called before the operation is processed, so can only provide
5311  * an upper estimate.  For some nonidempotent operations (such as
5312  * getattr), it's not necessarily a problem if that estimate is wrong,
5313  * as we can fail it after processing without significant side effects.
5314  */
5315 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
5316 {
5317         struct xdr_buf *buf = &resp->rqstp->rq_res;
5318         struct nfsd4_slot *slot = resp->cstate.slot;
5319
5320         if (buf->len + respsize <= buf->buflen)
5321                 return nfs_ok;
5322         if (!nfsd4_has_session(&resp->cstate))
5323                 return nfserr_resource;
5324         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
5325                 WARN_ON_ONCE(1);
5326                 return nfserr_rep_too_big_to_cache;
5327         }
5328         return nfserr_rep_too_big;
5329 }
5330
5331 void
5332 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
5333 {
5334         struct xdr_stream *xdr = resp->xdr;
5335         struct nfs4_stateowner *so = resp->cstate.replay_owner;
5336         struct svc_rqst *rqstp = resp->rqstp;
5337         const struct nfsd4_operation *opdesc = op->opdesc;
5338         int post_err_offset;
5339         nfsd4_enc encoder;
5340         __be32 *p;
5341
5342         p = xdr_reserve_space(xdr, 8);
5343         if (!p) {
5344                 WARN_ON_ONCE(1);
5345                 return;
5346         }
5347         *p++ = cpu_to_be32(op->opnum);
5348         post_err_offset = xdr->buf->len;
5349
5350         if (op->opnum == OP_ILLEGAL)
5351                 goto status;
5352         if (op->status && opdesc &&
5353                         !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
5354                 goto status;
5355         BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
5356                !nfsd4_enc_ops[op->opnum]);
5357         encoder = nfsd4_enc_ops[op->opnum];
5358         op->status = encoder(resp, op->status, &op->u);
5359         if (op->status)
5360                 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status);
5361         if (opdesc && opdesc->op_release)
5362                 opdesc->op_release(&op->u);
5363         xdr_commit_encode(xdr);
5364
5365         /* nfsd4_check_resp_size guarantees enough room for error status */
5366         if (!op->status) {
5367                 int space_needed = 0;
5368                 if (!nfsd4_last_compound_op(rqstp))
5369                         space_needed = COMPOUND_ERR_SLACK_SPACE;
5370                 op->status = nfsd4_check_resp_size(resp, space_needed);
5371         }
5372         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
5373                 struct nfsd4_slot *slot = resp->cstate.slot;
5374
5375                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
5376                         op->status = nfserr_rep_too_big_to_cache;
5377                 else
5378                         op->status = nfserr_rep_too_big;
5379         }
5380         if (op->status == nfserr_resource ||
5381             op->status == nfserr_rep_too_big ||
5382             op->status == nfserr_rep_too_big_to_cache) {
5383                 /*
5384                  * The operation may have already been encoded or
5385                  * partially encoded.  No op returns anything additional
5386                  * in the case of one of these three errors, so we can
5387                  * just truncate back to after the status.  But it's a
5388                  * bug if we had to do this on a non-idempotent op:
5389                  */
5390                 warn_on_nonidempotent_op(op);
5391                 xdr_truncate_encode(xdr, post_err_offset);
5392         }
5393         if (so) {
5394                 int len = xdr->buf->len - post_err_offset;
5395
5396                 so->so_replay.rp_status = op->status;
5397                 so->so_replay.rp_buflen = len;
5398                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
5399                                                 so->so_replay.rp_buf, len);
5400         }
5401 status:
5402         *p = op->status;
5403 }
5404
5405 /*
5406  * Encode the reply stored in the stateowner reply cache
5407  *
5408  * XDR note: do not encode rp->rp_buflen: the buffer contains the
5409  * previously sent already encoded operation.
5410  */
5411 void
5412 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
5413 {
5414         __be32 *p;
5415         struct nfs4_replay *rp = op->replay;
5416
5417         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
5418         if (!p) {
5419                 WARN_ON_ONCE(1);
5420                 return;
5421         }
5422         *p++ = cpu_to_be32(op->opnum);
5423         *p++ = rp->rp_status;  /* already xdr'ed */
5424
5425         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
5426 }
5427
5428 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
5429 {
5430         struct nfsd4_compoundargs *args = rqstp->rq_argp;
5431
5432         if (args->ops != args->iops) {
5433                 vfree(args->ops);
5434                 args->ops = args->iops;
5435         }
5436         while (args->to_free) {
5437                 struct svcxdr_tmpbuf *tb = args->to_free;
5438                 args->to_free = tb->next;
5439                 kfree(tb);
5440         }
5441 }
5442
5443 bool
5444 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5445 {
5446         struct nfsd4_compoundargs *args = rqstp->rq_argp;
5447
5448         /* svcxdr_tmp_alloc */
5449         args->to_free = NULL;
5450
5451         args->xdr = xdr;
5452         args->ops = args->iops;
5453         args->rqstp = rqstp;
5454
5455         return nfsd4_decode_compound(args);
5456 }
5457
5458 bool
5459 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5460 {
5461         struct nfsd4_compoundres *resp = rqstp->rq_resp;
5462         __be32 *p;
5463
5464         /*
5465          * Send buffer space for the following items is reserved
5466          * at the top of nfsd4_proc_compound().
5467          */
5468         p = resp->statusp;
5469
5470         *p++ = resp->cstate.status;
5471
5472         rqstp->rq_next_page = xdr->page_ptr + 1;
5473
5474         *p++ = htonl(resp->taglen);
5475         memcpy(p, resp->tag, resp->taglen);
5476         p += XDR_QUADLEN(resp->taglen);
5477         *p++ = htonl(resp->opcnt);
5478
5479         nfsd4_sequence_done(resp);
5480         return true;
5481 }