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                     union nfsd4_op_u *u)
 774 {
 775         struct nfsd4_access *access = &u->access;
 776         if (xdr_stream_decode_u32(argp->xdr, &access->ac_req_access) < 0)
 777                 return nfserr_bad_xdr;
 778         return nfs_ok;
 779 }
 780
 781 static __be32
 782 nfsd4_decode_close(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 783 {
 784         struct nfsd4_close *close = &u->close;
 785         if (xdr_stream_decode_u32(argp->xdr, &close->cl_seqid) < 0)
 786                 return nfserr_bad_xdr;
 787         return nfsd4_decode_stateid4(argp, &close->cl_stateid);
 788 }
 789
 790
 791 static __be32
 792 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 793 {
 794         struct nfsd4_commit *commit = &u->commit;
 795         if (xdr_stream_decode_u64(argp->xdr, &commit->co_offset) < 0)
 796                 return nfserr_bad_xdr;
 797         if (xdr_stream_decode_u32(argp->xdr, &commit->co_count) < 0)
 798                 return nfserr_bad_xdr;
 799         memset(&commit->co_verf, 0, sizeof(commit->co_verf));
 800         return nfs_ok;
 801 }
 802
 803 static __be32
 804 nfsd4_decode_create(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 805 {
 806         struct nfsd4_create *create = &u->create;
 807         __be32 *p, status;
 808
 809         memset(create, 0, sizeof(*create));
 810         if (xdr_stream_decode_u32(argp->xdr, &create->cr_type) < 0)
 811                 return nfserr_bad_xdr;
 812         switch (create->cr_type) {
 813         case NF4LNK:
 814                 if (xdr_stream_decode_u32(argp->xdr, &create->cr_datalen) < 0)
 815                         return nfserr_bad_xdr;
 816                 p = xdr_inline_decode(argp->xdr, create->cr_datalen);
 817                 if (!p)
 818                         return nfserr_bad_xdr;
 819                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 820                 if (!create->cr_data)
 821                         return nfserr_jukebox;
 822                 break;
 823         case NF4BLK:
 824         case NF4CHR:
 825                 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata1) < 0)
 826                         return nfserr_bad_xdr;
 827                 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata2) < 0)
 828                         return nfserr_bad_xdr;
 829                 break;
 830         case NF4SOCK:
 831         case NF4FIFO:
 832         case NF4DIR:
 833         default:
 834                 break;
 835         }
 836         status = nfsd4_decode_component4(argp, &create->cr_name,
 837                                          &create->cr_namelen);
 838         if (status)
 839                 return status;
 840         status = nfsd4_decode_fattr4(argp, create->cr_bmval,
 841                                     ARRAY_SIZE(create->cr_bmval),
 842                                     &create->cr_iattr, &create->cr_acl,
 843                                     &create->cr_label, &create->cr_umask);
 844         if (status)
 845                 return status;
 846
 847         return nfs_ok;
 848 }
 849
 850 static inline __be32
 851 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 852 {
 853         struct nfsd4_delegreturn *dr = &u->delegreturn;
 854         return nfsd4_decode_stateid4(argp, &dr->dr_stateid);
 855 }
 856
 857 static inline __be32
 858 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 859 {
 860         struct nfsd4_getattr *getattr = &u->getattr;
 861         memset(getattr, 0, sizeof(*getattr));
 862         return nfsd4_decode_bitmap4(argp, getattr->ga_bmval,
 863                                     ARRAY_SIZE(getattr->ga_bmval));
 864 }
 865
 866 static __be32
 867 nfsd4_decode_link(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 868 {
 869         struct nfsd4_link *link = &u->link;
 870         memset(link, 0, sizeof(*link));
 871         return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen);
 872 }
 873
 874 static __be32
 875 nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp,
 876                                  struct nfsd4_lock *lock)
 877 {
 878         __be32 status;
 879
 880         if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0)
 881                 return nfserr_bad_xdr;
 882         status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid);
 883         if (status)
 884                 return status;
 885         if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0)
 886                 return nfserr_bad_xdr;
 887         return nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid,
 888                                          &lock->lk_new_owner);
 889 }
 890
 891 static __be32
 892 nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp,
 893                                struct nfsd4_lock *lock)
 894 {
 895         __be32 status;
 896
 897         status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid);
 898         if (status)
 899                 return status;
 900         if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0)
 901                 return nfserr_bad_xdr;
 902
 903         return nfs_ok;
 904 }
 905
 906 static __be32
 907 nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 908 {
 909         if (xdr_stream_decode_bool(argp->xdr, &lock->lk_is_new) < 0)
 910                 return nfserr_bad_xdr;
 911         if (lock->lk_is_new)
 912                 return nfsd4_decode_open_to_lock_owner4(argp, lock);
 913         return nfsd4_decode_exist_lock_owner4(argp, lock);
 914 }
 915
 916 static __be32
 917 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 918 {
 919         struct nfsd4_lock *lock = &u->lock;
 920         memset(lock, 0, sizeof(*lock));
 921         if (xdr_stream_decode_u32(argp->xdr, &lock->lk_type) < 0)
 922                 return nfserr_bad_xdr;
 923         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 924                 return nfserr_bad_xdr;
 925         if (xdr_stream_decode_bool(argp->xdr, &lock->lk_reclaim) < 0)
 926                 return nfserr_bad_xdr;
 927         if (xdr_stream_decode_u64(argp->xdr, &lock->lk_offset) < 0)
 928                 return nfserr_bad_xdr;
 929         if (xdr_stream_decode_u64(argp->xdr, &lock->lk_length) < 0)
 930                 return nfserr_bad_xdr;
 931         return nfsd4_decode_locker4(argp, lock);
 932 }
 933
 934 static __be32
 935 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 936 {
 937         struct nfsd4_lockt *lockt = &u->lockt;
 938         memset(lockt, 0, sizeof(*lockt));
 939         if (xdr_stream_decode_u32(argp->xdr, &lockt->lt_type) < 0)
 940                 return nfserr_bad_xdr;
 941         if ((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 942                 return nfserr_bad_xdr;
 943         if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_offset) < 0)
 944                 return nfserr_bad_xdr;
 945         if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_length) < 0)
 946                 return nfserr_bad_xdr;
 947         return nfsd4_decode_state_owner4(argp, &lockt->lt_clientid,
 948                                          &lockt->lt_owner);
 949 }
 950
 951 static __be32
 952 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 953 {
 954         struct nfsd4_locku *locku = &u->locku;
 955         __be32 status;
 956
 957         if (xdr_stream_decode_u32(argp->xdr, &locku->lu_type) < 0)
 958                 return nfserr_bad_xdr;
 959         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 960                 return nfserr_bad_xdr;
 961         if (xdr_stream_decode_u32(argp->xdr, &locku->lu_seqid) < 0)
 962                 return nfserr_bad_xdr;
 963         status = nfsd4_decode_stateid4(argp, &locku->lu_stateid);
 964         if (status)
 965                 return status;
 966         if (xdr_stream_decode_u64(argp->xdr, &locku->lu_offset) < 0)
 967                 return nfserr_bad_xdr;
 968         if (xdr_stream_decode_u64(argp->xdr, &locku->lu_length) < 0)
 969                 return nfserr_bad_xdr;
 970
 971         return nfs_ok;
 972 }
 973
 974 static __be32
 975 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 976 {
 977         struct nfsd4_lookup *lookup = &u->lookup;
 978         return nfsd4_decode_component4(argp, &lookup->lo_name, &lookup->lo_len);
 979 }
 980
 981 static __be32
 982 nfsd4_decode_createhow4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 983 {
 984         __be32 status;
 985
 986         if (xdr_stream_decode_u32(argp->xdr, &open->op_createmode) < 0)
 987                 return nfserr_bad_xdr;
 988         switch (open->op_createmode) {
 989         case NFS4_CREATE_UNCHECKED:
 990         case NFS4_CREATE_GUARDED:
 991                 status = nfsd4_decode_fattr4(argp, open->op_bmval,
 992                                              ARRAY_SIZE(open->op_bmval),
 993                                              &open->op_iattr, &open->op_acl,
 994                                              &open->op_label, &open->op_umask);
 995                 if (status)
 996                         return status;
 997                 break;
 998         case NFS4_CREATE_EXCLUSIVE:
 999                 status = nfsd4_decode_verifier4(argp, &open->op_verf);
1000                 if (status)
1001                         return status;
1002                 break;
1003         case NFS4_CREATE_EXCLUSIVE4_1:
1004                 if (argp->minorversion < 1)
1005                         return nfserr_bad_xdr;
1006                 status = nfsd4_decode_verifier4(argp, &open->op_verf);
1007                 if (status)
1008                         return status;
1009                 status = nfsd4_decode_fattr4(argp, open->op_bmval,
1010                                              ARRAY_SIZE(open->op_bmval),
1011                                              &open->op_iattr, &open->op_acl,
1012                                              &open->op_label, &open->op_umask);
1013                 if (status)
1014                         return status;
1015                 break;
1016         default:
1017                 return nfserr_bad_xdr;
1018         }
1019
1020         return nfs_ok;
1021 }
1022
1023 static __be32
1024 nfsd4_decode_openflag4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
1025 {
1026         __be32 status;
1027
1028         if (xdr_stream_decode_u32(argp->xdr, &open->op_create) < 0)
1029                 return nfserr_bad_xdr;
1030         switch (open->op_create) {
1031         case NFS4_OPEN_NOCREATE:
1032                 break;
1033         case NFS4_OPEN_CREATE:
1034                 status = nfsd4_decode_createhow4(argp, open);
1035                 if (status)
1036                         return status;
1037                 break;
1038         default:
1039                 return nfserr_bad_xdr;
1040         }
1041
1042         return nfs_ok;
1043 }
1044
1045 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
1046 {
1047         u32 w;
1048
1049         if (xdr_stream_decode_u32(argp->xdr, &w) < 0)
1050                 return nfserr_bad_xdr;
1051         *share_access = w & NFS4_SHARE_ACCESS_MASK;
1052         *deleg_want = w & NFS4_SHARE_WANT_MASK;
1053         if (deleg_when)
1054                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
1055
1056         switch (w & NFS4_SHARE_ACCESS_MASK) {
1057         case NFS4_SHARE_ACCESS_READ:
1058         case NFS4_SHARE_ACCESS_WRITE:
1059         case NFS4_SHARE_ACCESS_BOTH:
1060                 break;
1061         default:
1062                 return nfserr_bad_xdr;
1063         }
1064         w &= ~NFS4_SHARE_ACCESS_MASK;
1065         if (!w)
1066                 return nfs_ok;
1067         if (!argp->minorversion)
1068                 return nfserr_bad_xdr;
1069         switch (w & NFS4_SHARE_WANT_MASK) {
1070         case NFS4_SHARE_WANT_NO_PREFERENCE:
1071         case NFS4_SHARE_WANT_READ_DELEG:
1072         case NFS4_SHARE_WANT_WRITE_DELEG:
1073         case NFS4_SHARE_WANT_ANY_DELEG:
1074         case NFS4_SHARE_WANT_NO_DELEG:
1075         case NFS4_SHARE_WANT_CANCEL:
1076                 break;
1077         default:
1078                 return nfserr_bad_xdr;
1079         }
1080         w &= ~NFS4_SHARE_WANT_MASK;
1081         if (!w)
1082                 return nfs_ok;
1083
1084         if (!deleg_when)        /* open_downgrade */
1085                 return nfserr_inval;
1086         switch (w) {
1087         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
1088         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
1089         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
1090               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
1091                 return nfs_ok;
1092         }
1093         return nfserr_bad_xdr;
1094 }
1095
1096 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
1097 {
1098         if (xdr_stream_decode_u32(argp->xdr, x) < 0)
1099                 return nfserr_bad_xdr;
1100         /* Note: unlike access bits, deny bits may be zero. */
1101         if (*x & ~NFS4_SHARE_DENY_BOTH)
1102                 return nfserr_bad_xdr;
1103
1104         return nfs_ok;
1105 }
1106
1107 static __be32
1108 nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp,
1109                          struct nfsd4_open *open)
1110 {
1111         __be32 status;
1112
1113         if (xdr_stream_decode_u32(argp->xdr, &open->op_claim_type) < 0)
1114                 return nfserr_bad_xdr;
1115         switch (open->op_claim_type) {
1116         case NFS4_OPEN_CLAIM_NULL:
1117         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1118                 status = nfsd4_decode_component4(argp, &open->op_fname,
1119                                                  &open->op_fnamelen);
1120                 if (status)
1121                         return status;
1122                 break;
1123         case NFS4_OPEN_CLAIM_PREVIOUS:
1124                 if (xdr_stream_decode_u32(argp->xdr, &open->op_delegate_type) < 0)
1125                         return nfserr_bad_xdr;
1126                 break;
1127         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1128                 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1129                 if (status)
1130                         return status;
1131                 status = nfsd4_decode_component4(argp, &open->op_fname,
1132                                                  &open->op_fnamelen);
1133                 if (status)
1134                         return status;
1135                 break;
1136         case NFS4_OPEN_CLAIM_FH:
1137         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1138                 if (argp->minorversion < 1)
1139                         return nfserr_bad_xdr;
1140                 /* void */
1141                 break;
1142         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1143                 if (argp->minorversion < 1)
1144                         return nfserr_bad_xdr;
1145                 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1146                 if (status)
1147                         return status;
1148                 break;
1149         default:
1150                 return nfserr_bad_xdr;
1151         }
1152
1153         return nfs_ok;
1154 }
1155
1156 static __be32
1157 nfsd4_decode_open(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1158 {
1159         struct nfsd4_open *open = &u->open;
1160         __be32 status;
1161         u32 dummy;
1162
1163         memset(open, 0, sizeof(*open));
1164
1165         if (xdr_stream_decode_u32(argp->xdr, &open->op_seqid) < 0)
1166                 return nfserr_bad_xdr;
1167         /* deleg_want is ignored */
1168         status = nfsd4_decode_share_access(argp, &open->op_share_access,
1169                                            &open->op_deleg_want, &dummy);
1170         if (status)
1171                 return status;
1172         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
1173         if (status)
1174                 return status;
1175         status = nfsd4_decode_state_owner4(argp, &open->op_clientid,
1176                                            &open->op_owner);
1177         if (status)
1178                 return status;
1179         status = nfsd4_decode_openflag4(argp, open);
1180         if (status)
1181                 return status;
1182         return nfsd4_decode_open_claim4(argp, open);
1183 }
1184
1185 static __be32
1186 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp,
1187                           union nfsd4_op_u *u)
1188 {
1189         struct nfsd4_open_confirm *open_conf = &u->open_confirm;
1190         __be32 status;
1191
1192         if (argp->minorversion >= 1)
1193                 return nfserr_notsupp;
1194
1195         status = nfsd4_decode_stateid4(argp, &open_conf->oc_req_stateid);
1196         if (status)
1197                 return status;
1198         if (xdr_stream_decode_u32(argp->xdr, &open_conf->oc_seqid) < 0)
1199                 return nfserr_bad_xdr;
1200
1201         memset(&open_conf->oc_resp_stateid, 0,
1202                sizeof(open_conf->oc_resp_stateid));
1203         return nfs_ok;
1204 }
1205
1206 static __be32
1207 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp,
1208                             union nfsd4_op_u *u)
1209 {
1210         struct nfsd4_open_downgrade *open_down = &u->open_downgrade;
1211         __be32 status;
1212
1213         memset(open_down, 0, sizeof(*open_down));
1214         status = nfsd4_decode_stateid4(argp, &open_down->od_stateid);
1215         if (status)
1216                 return status;
1217         if (xdr_stream_decode_u32(argp->xdr, &open_down->od_seqid) < 0)
1218                 return nfserr_bad_xdr;
1219         /* deleg_want is ignored */
1220         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1221                                            &open_down->od_deleg_want, NULL);
1222         if (status)
1223                 return status;
1224         return nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1225 }
1226
1227 static __be32
1228 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1229 {
1230         struct nfsd4_putfh *putfh = &u->putfh;
1231         __be32 *p;
1232
1233         if (xdr_stream_decode_u32(argp->xdr, &putfh->pf_fhlen) < 0)
1234                 return nfserr_bad_xdr;
1235         if (putfh->pf_fhlen > NFS4_FHSIZE)
1236                 return nfserr_bad_xdr;
1237         p = xdr_inline_decode(argp->xdr, putfh->pf_fhlen);
1238         if (!p)
1239                 return nfserr_bad_xdr;
1240         putfh->pf_fhval = svcxdr_savemem(argp, p, putfh->pf_fhlen);
1241         if (!putfh->pf_fhval)
1242                 return nfserr_jukebox;
1243
1244         putfh->no_verify = false;
1245         return nfs_ok;
1246 }
1247
1248 static __be32
1249 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
1250 {
1251         if (argp->minorversion == 0)
1252                 return nfs_ok;
1253         return nfserr_notsupp;
1254 }
1255
1256 static __be32
1257 nfsd4_decode_read(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1258 {
1259         struct nfsd4_read *read = &u->read;
1260         __be32 status;
1261
1262         memset(read, 0, sizeof(*read));
1263         status = nfsd4_decode_stateid4(argp, &read->rd_stateid);
1264         if (status)
1265                 return status;
1266         if (xdr_stream_decode_u64(argp->xdr, &read->rd_offset) < 0)
1267                 return nfserr_bad_xdr;
1268         if (xdr_stream_decode_u32(argp->xdr, &read->rd_length) < 0)
1269                 return nfserr_bad_xdr;
1270
1271         return nfs_ok;
1272 }
1273
1274 static __be32
1275 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1276 {
1277         struct nfsd4_readdir *readdir = &u->readdir;
1278         __be32 status;
1279
1280         memset(readdir, 0, sizeof(*readdir));
1281         if (xdr_stream_decode_u64(argp->xdr, &readdir->rd_cookie) < 0)
1282                 return nfserr_bad_xdr;
1283         status = nfsd4_decode_verifier4(argp, &readdir->rd_verf);
1284         if (status)
1285                 return status;
1286         if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_dircount) < 0)
1287                 return nfserr_bad_xdr;
1288         if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_maxcount) < 0)
1289                 return nfserr_bad_xdr;
1290         if (xdr_stream_decode_uint32_array(argp->xdr, readdir->rd_bmval,
1291                                            ARRAY_SIZE(readdir->rd_bmval)) < 0)
1292                 return nfserr_bad_xdr;
1293
1294         return nfs_ok;
1295 }
1296
1297 static __be32
1298 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1299 {
1300         struct nfsd4_remove *remove = &u->remove;
1301         memset(&remove->rm_cinfo, 0, sizeof(remove->rm_cinfo));
1302         return nfsd4_decode_component4(argp, &remove->rm_name, &remove->rm_namelen);
1303 }
1304
1305 static __be32
1306 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1307 {
1308         struct nfsd4_rename *rename = &u->rename;
1309         __be32 status;
1310
1311         memset(rename, 0, sizeof(*rename));
1312         status = nfsd4_decode_component4(argp, &rename->rn_sname, &rename->rn_snamelen);
1313         if (status)
1314                 return status;
1315         return nfsd4_decode_component4(argp, &rename->rn_tname, &rename->rn_tnamelen);
1316 }
1317
1318 static __be32
1319 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1320 {
1321         clientid_t *clientid = &u->renew;
1322         return nfsd4_decode_clientid4(argp, clientid);
1323 }
1324
1325 static __be32
1326 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1327                      union nfsd4_op_u *u)
1328 {
1329         struct nfsd4_secinfo *secinfo = &u->secinfo;
1330         secinfo->si_exp = NULL;
1331         return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen);
1332 }
1333
1334 static __be32
1335 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1336 {
1337         struct nfsd4_setattr *setattr = &u->setattr;
1338         __be32 status;
1339
1340         memset(setattr, 0, sizeof(*setattr));
1341         status = nfsd4_decode_stateid4(argp, &setattr->sa_stateid);
1342         if (status)
1343                 return status;
1344         return nfsd4_decode_fattr4(argp, setattr->sa_bmval,
1345                                    ARRAY_SIZE(setattr->sa_bmval),
1346                                    &setattr->sa_iattr, &setattr->sa_acl,
1347                                    &setattr->sa_label, NULL);
1348 }
1349
1350 static __be32
1351 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1352 {
1353         struct nfsd4_setclientid *setclientid = &u->setclientid;
1354         __be32 *p, status;
1355
1356         memset(setclientid, 0, sizeof(*setclientid));
1357
1358         if (argp->minorversion >= 1)
1359                 return nfserr_notsupp;
1360
1361         status = nfsd4_decode_verifier4(argp, &setclientid->se_verf);
1362         if (status)
1363                 return status;
1364         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1365         if (status)
1366                 return status;
1367         if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_prog) < 0)
1368                 return nfserr_bad_xdr;
1369         if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_netid_len) < 0)
1370                 return nfserr_bad_xdr;
1371         p = xdr_inline_decode(argp->xdr, setclientid->se_callback_netid_len);
1372         if (!p)
1373                 return nfserr_bad_xdr;
1374         setclientid->se_callback_netid_val = svcxdr_savemem(argp, p,
1375                                                 setclientid->se_callback_netid_len);
1376         if (!setclientid->se_callback_netid_val)
1377                 return nfserr_jukebox;
1378
1379         if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_addr_len) < 0)
1380                 return nfserr_bad_xdr;
1381         p = xdr_inline_decode(argp->xdr, setclientid->se_callback_addr_len);
1382         if (!p)
1383                 return nfserr_bad_xdr;
1384         setclientid->se_callback_addr_val = svcxdr_savemem(argp, p,
1385                                                 setclientid->se_callback_addr_len);
1386         if (!setclientid->se_callback_addr_val)
1387                 return nfserr_jukebox;
1388         if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_ident) < 0)
1389                 return nfserr_bad_xdr;
1390
1391         return nfs_ok;
1392 }
1393
1394 static __be32
1395 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp,
1396                                  union nfsd4_op_u *u)
1397 {
1398         struct nfsd4_setclientid_confirm *scd_c = &u->setclientid_confirm;
1399         __be32 status;
1400
1401         if (argp->minorversion >= 1)
1402                 return nfserr_notsupp;
1403
1404         status = nfsd4_decode_clientid4(argp, &scd_c->sc_clientid);
1405         if (status)
1406                 return status;
1407         return nfsd4_decode_verifier4(argp, &scd_c->sc_confirm);
1408 }
1409
1410 /* Also used for NVERIFY */
1411 static __be32
1412 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1413 {
1414         struct nfsd4_verify *verify = &u->verify;
1415         __be32 *p, status;
1416
1417         memset(verify, 0, sizeof(*verify));
1418
1419         status = nfsd4_decode_bitmap4(argp, verify->ve_bmval,
1420                                       ARRAY_SIZE(verify->ve_bmval));
1421         if (status)
1422                 return status;
1423
1424         /* For convenience's sake, we compare raw xdr'd attributes in
1425          * nfsd4_proc_verify */
1426
1427         if (xdr_stream_decode_u32(argp->xdr, &verify->ve_attrlen) < 0)
1428                 return nfserr_bad_xdr;
1429         p = xdr_inline_decode(argp->xdr, verify->ve_attrlen);
1430         if (!p)
1431                 return nfserr_bad_xdr;
1432         verify->ve_attrval = svcxdr_savemem(argp, p, verify->ve_attrlen);
1433         if (!verify->ve_attrval)
1434                 return nfserr_jukebox;
1435
1436         return nfs_ok;
1437 }
1438
1439 static __be32
1440 nfsd4_decode_write(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1441 {
1442         struct nfsd4_write *write = &u->write;
1443         __be32 status;
1444
1445         status = nfsd4_decode_stateid4(argp, &write->wr_stateid);
1446         if (status)
1447                 return status;
1448         if (xdr_stream_decode_u64(argp->xdr, &write->wr_offset) < 0)
1449                 return nfserr_bad_xdr;
1450         if (xdr_stream_decode_u32(argp->xdr, &write->wr_stable_how) < 0)
1451                 return nfserr_bad_xdr;
1452         if (write->wr_stable_how > NFS_FILE_SYNC)
1453                 return nfserr_bad_xdr;
1454         if (xdr_stream_decode_u32(argp->xdr, &write->wr_buflen) < 0)
1455                 return nfserr_bad_xdr;
1456         if (!xdr_stream_subsegment(argp->xdr, &write->wr_payload, write->wr_buflen))
1457                 return nfserr_bad_xdr;
1458
1459         write->wr_bytes_written = 0;
1460         write->wr_how_written = 0;
1461         memset(&write->wr_verifier, 0, sizeof(write->wr_verifier));
1462         return nfs_ok;
1463 }
1464
1465 static __be32
1466 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp,
1467                                union nfsd4_op_u *u)
1468 {
1469         struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
1470         __be32 status;
1471
1472         if (argp->minorversion >= 1)
1473                 return nfserr_notsupp;
1474
1475         status = nfsd4_decode_state_owner4(argp, &rlockowner->rl_clientid,
1476                                            &rlockowner->rl_owner);
1477         if (status)
1478                 return status;
1479
1480         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1481                 return nfserr_inval;
1482
1483         return nfs_ok;
1484 }
1485
1486 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp,
1487                                            union nfsd4_op_u *u)
1488 {
1489         struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
1490         memset(bc, 0, sizeof(*bc));
1491         if (xdr_stream_decode_u32(argp->xdr, &bc->bc_cb_program) < 0)
1492                 return nfserr_bad_xdr;
1493         return nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
1494 }
1495
1496 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp,
1497                                                 union nfsd4_op_u *u)
1498 {
1499         struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
1500         u32 use_conn_in_rdma_mode;
1501         __be32 status;
1502
1503         memset(bcts, 0, sizeof(*bcts));
1504         status = nfsd4_decode_sessionid4(argp, &bcts->sessionid);
1505         if (status)
1506                 return status;
1507         if (xdr_stream_decode_u32(argp->xdr, &bcts->dir) < 0)
1508                 return nfserr_bad_xdr;
1509         if (xdr_stream_decode_u32(argp->xdr, &use_conn_in_rdma_mode) < 0)
1510                 return nfserr_bad_xdr;
1511
1512         return nfs_ok;
1513 }
1514
1515 static __be32
1516 nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp,
1517                                struct nfsd4_exchange_id *exid)
1518 {
1519         __be32 status;
1520
1521         status = nfsd4_decode_bitmap4(argp, exid->spo_must_enforce,
1522                                       ARRAY_SIZE(exid->spo_must_enforce));
1523         if (status)
1524                 return nfserr_bad_xdr;
1525         status = nfsd4_decode_bitmap4(argp, exid->spo_must_allow,
1526                                       ARRAY_SIZE(exid->spo_must_allow));
1527         if (status)
1528                 return nfserr_bad_xdr;
1529
1530         return nfs_ok;
1531 }
1532
1533 /*
1534  * This implementation currently does not support SP4_SSV.
1535  * This decoder simply skips over these arguments.
1536  */
1537 static noinline __be32
1538 nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp,
1539                           struct nfsd4_exchange_id *exid)
1540 {
1541         u32 count, window, num_gss_handles;
1542         __be32 status;
1543
1544         /* ssp_ops */
1545         status = nfsd4_decode_state_protect_ops(argp, exid);
1546         if (status)
1547                 return status;
1548
1549         /* ssp_hash_algs<> */
1550         if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1551                 return nfserr_bad_xdr;
1552         while (count--) {
1553                 status = nfsd4_decode_ignored_string(argp, 0);
1554                 if (status)
1555                         return status;
1556         }
1557
1558         /* ssp_encr_algs<> */
1559         if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1560                 return nfserr_bad_xdr;
1561         while (count--) {
1562                 status = nfsd4_decode_ignored_string(argp, 0);
1563                 if (status)
1564                         return status;
1565         }
1566
1567         if (xdr_stream_decode_u32(argp->xdr, &window) < 0)
1568                 return nfserr_bad_xdr;
1569         if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0)
1570                 return nfserr_bad_xdr;
1571
1572         return nfs_ok;
1573 }
1574
1575 static __be32
1576 nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp,
1577                               struct nfsd4_exchange_id *exid)
1578 {
1579         __be32 status;
1580
1581         if (xdr_stream_decode_u32(argp->xdr, &exid->spa_how) < 0)
1582                 return nfserr_bad_xdr;
1583         switch (exid->spa_how) {
1584         case SP4_NONE:
1585                 break;
1586         case SP4_MACH_CRED:
1587                 status = nfsd4_decode_state_protect_ops(argp, exid);
1588                 if (status)
1589                         return status;
1590                 break;
1591         case SP4_SSV:
1592                 status = nfsd4_decode_ssv_sp_parms(argp, exid);
1593                 if (status)
1594                         return status;
1595                 break;
1596         default:
1597                 return nfserr_bad_xdr;
1598         }
1599
1600         return nfs_ok;
1601 }
1602
1603 static __be32
1604 nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp,
1605                           struct nfsd4_exchange_id *exid)
1606 {
1607         __be32 status;
1608         u32 count;
1609
1610         if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1611                 return nfserr_bad_xdr;
1612         switch (count) {
1613         case 0:
1614                 break;
1615         case 1:
1616                 /* Note that RFC 8881 places no length limit on
1617                  * nii_domain, but this implementation permits no
1618                  * more than NFS4_OPAQUE_LIMIT bytes */
1619                 status = nfsd4_decode_opaque(argp, &exid->nii_domain);
1620                 if (status)
1621                         return status;
1622                 /* Note that RFC 8881 places no length limit on
1623                  * nii_name, but this implementation permits no
1624                  * more than NFS4_OPAQUE_LIMIT bytes */
1625                 status = nfsd4_decode_opaque(argp, &exid->nii_name);
1626                 if (status)
1627                         return status;
1628                 status = nfsd4_decode_nfstime4(argp, &exid->nii_time);
1629                 if (status)
1630                         return status;
1631                 break;
1632         default:
1633                 return nfserr_bad_xdr;
1634         }
1635
1636         return nfs_ok;
1637 }
1638
1639 static __be32
1640 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1641                          union nfsd4_op_u *u)
1642 {
1643         struct nfsd4_exchange_id *exid = &u->exchange_id;
1644         __be32 status;
1645
1646         memset(exid, 0, sizeof(*exid));
1647         status = nfsd4_decode_verifier4(argp, &exid->verifier);
1648         if (status)
1649                 return status;
1650         status = nfsd4_decode_opaque(argp, &exid->clname);
1651         if (status)
1652                 return status;
1653         if (xdr_stream_decode_u32(argp->xdr, &exid->flags) < 0)
1654                 return nfserr_bad_xdr;
1655         status = nfsd4_decode_state_protect4_a(argp, exid);
1656         if (status)
1657                 return status;
1658         return nfsd4_decode_nfs_impl_id4(argp, exid);
1659 }
1660
1661 static __be32
1662 nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp,
1663                             struct nfsd4_channel_attrs *ca)
1664 {
1665         __be32 *p;
1666
1667         p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7);
1668         if (!p)
1669                 return nfserr_bad_xdr;
1670
1671         /* headerpadsz is ignored */
1672         p++;
1673         ca->maxreq_sz = be32_to_cpup(p++);
1674         ca->maxresp_sz = be32_to_cpup(p++);
1675         ca->maxresp_cached = be32_to_cpup(p++);
1676         ca->maxops = be32_to_cpup(p++);
1677         ca->maxreqs = be32_to_cpup(p++);
1678         ca->nr_rdma_attrs = be32_to_cpup(p);
1679         switch (ca->nr_rdma_attrs) {
1680         case 0:
1681                 break;
1682         case 1:
1683                 if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0)
1684                         return nfserr_bad_xdr;
1685                 break;
1686         default:
1687                 return nfserr_bad_xdr;
1688         }
1689
1690         return nfs_ok;
1691 }
1692
1693 static __be32
1694 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1695                             union nfsd4_op_u *u)
1696 {
1697         struct nfsd4_create_session *sess = &u->create_session;
1698         __be32 status;
1699
1700         memset(sess, 0, sizeof(*sess));
1701         status = nfsd4_decode_clientid4(argp, &sess->clientid);
1702         if (status)
1703                 return status;
1704         if (xdr_stream_decode_u32(argp->xdr, &sess->seqid) < 0)
1705                 return nfserr_bad_xdr;
1706         if (xdr_stream_decode_u32(argp->xdr, &sess->flags) < 0)
1707                 return nfserr_bad_xdr;
1708         status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel);
1709         if (status)
1710                 return status;
1711         status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel);
1712         if (status)
1713                 return status;
1714         if (xdr_stream_decode_u32(argp->xdr, &sess->callback_prog) < 0)
1715                 return nfserr_bad_xdr;
1716         return nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1717 }
1718
1719 static __be32
1720 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1721                              union nfsd4_op_u *u)
1722 {
1723         struct nfsd4_destroy_session *destroy_session = &u->destroy_session;
1724         return nfsd4_decode_sessionid4(argp, &destroy_session->sessionid);
1725 }
1726
1727 static __be32
1728 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1729                           union nfsd4_op_u *u)
1730 {
1731         struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
1732         return nfsd4_decode_stateid4(argp, &free_stateid->fr_stateid);
1733 }
1734
1735 #ifdef CONFIG_NFSD_PNFS
1736 static __be32
1737 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1738                 union nfsd4_op_u *u)
1739 {
1740         struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
1741         __be32 status;
1742
1743         memset(gdev, 0, sizeof(*gdev));
1744         status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid);
1745         if (status)
1746                 return status;
1747         if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0)
1748                 return nfserr_bad_xdr;
1749         if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0)
1750                 return nfserr_bad_xdr;
1751         if (xdr_stream_decode_uint32_array(argp->xdr,
1752                                            &gdev->gd_notify_types, 1) < 0)
1753                 return nfserr_bad_xdr;
1754
1755         return nfs_ok;
1756 }
1757
1758 static __be32
1759 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1760                           union nfsd4_op_u *u)
1761 {
1762         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1763         __be32 *p, status;
1764
1765         memset(lcp, 0, sizeof(*lcp));
1766         if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0)
1767                 return nfserr_bad_xdr;
1768         if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0)
1769                 return nfserr_bad_xdr;
1770         if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0)
1771                 return nfserr_bad_xdr;
1772         status = nfsd4_decode_stateid4(argp, &lcp->lc_sid);
1773         if (status)
1774                 return status;
1775         if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0)
1776                 return nfserr_bad_xdr;
1777         if (lcp->lc_newoffset) {
1778                 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0)
1779                         return nfserr_bad_xdr;
1780         } else
1781                 lcp->lc_last_wr = 0;
1782         p = xdr_inline_decode(argp->xdr, XDR_UNIT);
1783         if (!p)
1784                 return nfserr_bad_xdr;
1785         if (xdr_item_is_present(p)) {
1786                 status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime);
1787                 if (status)
1788                         return status;
1789         } else {
1790                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1791         }
1792         return nfsd4_decode_layoutupdate4(argp, lcp);
1793 }
1794
1795 static __be32
1796 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1797                 union nfsd4_op_u *u)
1798 {
1799         struct nfsd4_layoutget *lgp = &u->layoutget;
1800         __be32 status;
1801
1802         memset(lgp, 0, sizeof(*lgp));
1803         if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_signal) < 0)
1804                 return nfserr_bad_xdr;
1805         if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_layout_type) < 0)
1806                 return nfserr_bad_xdr;
1807         if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_seg.iomode) < 0)
1808                 return nfserr_bad_xdr;
1809         if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.offset) < 0)
1810                 return nfserr_bad_xdr;
1811         if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.length) < 0)
1812                 return nfserr_bad_xdr;
1813         if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_minlength) < 0)
1814                 return nfserr_bad_xdr;
1815         status = nfsd4_decode_stateid4(argp, &lgp->lg_sid);
1816         if (status)
1817                 return status;
1818         if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_maxcount) < 0)
1819                 return nfserr_bad_xdr;
1820
1821         return nfs_ok;
1822 }
1823
1824 static __be32
1825 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1826                 union nfsd4_op_u *u)
1827 {
1828         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1829         memset(lrp, 0, sizeof(*lrp));
1830         if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0)
1831                 return nfserr_bad_xdr;
1832         if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0)
1833                 return nfserr_bad_xdr;
1834         if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0)
1835                 return nfserr_bad_xdr;
1836         return nfsd4_decode_layoutreturn4(argp, lrp);
1837 }
1838 #endif /* CONFIG_NFSD_PNFS */
1839
1840 static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1841                                            union nfsd4_op_u *u)
1842 {
1843         struct nfsd4_secinfo_no_name *sin = &u->secinfo_no_name;
1844         if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0)
1845                 return nfserr_bad_xdr;
1846
1847         sin->sin_exp = NULL;
1848         return nfs_ok;
1849 }
1850
1851 static __be32
1852 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1853                       union nfsd4_op_u *u)
1854 {
1855         struct nfsd4_sequence *seq = &u->sequence;
1856         __be32 *p, status;
1857
1858         status = nfsd4_decode_sessionid4(argp, &seq->sessionid);
1859         if (status)
1860                 return status;
1861         p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4);
1862         if (!p)
1863                 return nfserr_bad_xdr;
1864         seq->seqid = be32_to_cpup(p++);
1865         seq->slotid = be32_to_cpup(p++);
1866         seq->maxslots = be32_to_cpup(p++);
1867         seq->cachethis = be32_to_cpup(p);
1868
1869         seq->status_flags = 0;
1870         return nfs_ok;
1871 }
1872
1873 static __be32
1874 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp,
1875                           union nfsd4_op_u *u)
1876 {
1877         struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
1878         struct nfsd4_test_stateid_id *stateid;
1879         __be32 status;
1880         u32 i;
1881
1882         memset(test_stateid, 0, sizeof(*test_stateid));
1883         if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0)
1884                 return nfserr_bad_xdr;
1885
1886         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1887         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1888                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1889                 if (!stateid)
1890                         return nfserr_jukebox;
1891                 INIT_LIST_HEAD(&stateid->ts_id_list);
1892                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1893                 status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid);
1894                 if (status)
1895                         return status;
1896         }
1897
1898         return nfs_ok;
1899 }
1900
1901 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp,
1902                                             union nfsd4_op_u *u)
1903 {
1904         struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
1905         return nfsd4_decode_clientid4(argp, &dc->clientid);
1906 }
1907
1908 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp,
1909                                             union nfsd4_op_u *u)
1910 {
1911         struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
1912         if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0)
1913                 return nfserr_bad_xdr;
1914         return nfs_ok;
1915 }
1916
1917 static __be32
1918 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1919                        union nfsd4_op_u *u)
1920 {
1921         struct nfsd4_fallocate *fallocate = &u->allocate;
1922         __be32 status;
1923
1924         status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid);
1925         if (status)
1926                 return status;
1927         if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0)
1928                 return nfserr_bad_xdr;
1929         if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0)
1930                 return nfserr_bad_xdr;
1931
1932         return nfs_ok;
1933 }
1934
1935 static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
1936                                       struct nl4_server *ns)
1937 {
1938         struct nfs42_netaddr *naddr;
1939         __be32 *p;
1940
1941         if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0)
1942                 return nfserr_bad_xdr;
1943
1944         /* currently support for 1 inter-server source server */
1945         switch (ns->nl4_type) {
1946         case NL4_NETADDR:
1947                 naddr = &ns->u.nl4_addr;
1948
1949                 if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0)
1950                         return nfserr_bad_xdr;
1951                 if (naddr->netid_len > RPCBIND_MAXNETIDLEN)
1952                         return nfserr_bad_xdr;
1953
1954                 p = xdr_inline_decode(argp->xdr, naddr->netid_len);
1955                 if (!p)
1956                         return nfserr_bad_xdr;
1957                 memcpy(naddr->netid, p, naddr->netid_len);
1958
1959                 if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0)
1960                         return nfserr_bad_xdr;
1961                 if (naddr->addr_len > RPCBIND_MAXUADDRLEN)
1962                         return nfserr_bad_xdr;
1963
1964                 p = xdr_inline_decode(argp->xdr, naddr->addr_len);
1965                 if (!p)
1966                         return nfserr_bad_xdr;
1967                 memcpy(naddr->addr, p, naddr->addr_len);
1968                 break;
1969         default:
1970                 return nfserr_bad_xdr;
1971         }
1972
1973         return nfs_ok;
1974 }
1975
1976 static __be32
1977 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1978 {
1979         struct nfsd4_copy *copy = &u->copy;
1980         u32 consecutive, i, count, sync;
1981         struct nl4_server *ns_dummy;
1982         __be32 status;
1983
1984         memset(copy, 0, sizeof(*copy));
1985         status = nfsd4_decode_stateid4(argp, &copy->cp_src_stateid);
1986         if (status)
1987                 return status;
1988         status = nfsd4_decode_stateid4(argp, &copy->cp_dst_stateid);
1989         if (status)
1990                 return status;
1991         if (xdr_stream_decode_u64(argp->xdr, &copy->cp_src_pos) < 0)
1992                 return nfserr_bad_xdr;
1993         if (xdr_stream_decode_u64(argp->xdr, &copy->cp_dst_pos) < 0)
1994                 return nfserr_bad_xdr;
1995         if (xdr_stream_decode_u64(argp->xdr, &copy->cp_count) < 0)
1996                 return nfserr_bad_xdr;
1997         /* ca_consecutive: we always do consecutive copies */
1998         if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0)
1999                 return nfserr_bad_xdr;
2000         if (xdr_stream_decode_bool(argp->xdr, &sync) < 0)
2001                 return nfserr_bad_xdr;
2002         nfsd4_copy_set_sync(copy, sync);
2003
2004         if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
2005                 return nfserr_bad_xdr;
2006         copy->cp_src = svcxdr_tmpalloc(argp, sizeof(*copy->cp_src));
2007         if (copy->cp_src == NULL)
2008                 return nfserr_jukebox;
2009         if (count == 0) { /* intra-server copy */
2010                 __set_bit(NFSD4_COPY_F_INTRA, &copy->cp_flags);
2011                 return nfs_ok;
2012         }
2013
2014         /* decode all the supplied server addresses but use only the first */
2015         status = nfsd4_decode_nl4_server(argp, copy->cp_src);
2016         if (status)
2017                 return status;
2018
2019         ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL);
2020         if (ns_dummy == NULL)
2021                 return nfserr_jukebox;
2022         for (i = 0; i < count - 1; i++) {
2023                 status = nfsd4_decode_nl4_server(argp, ns_dummy);
2024                 if (status) {
2025                         kfree(ns_dummy);
2026                         return status;
2027                 }
2028         }
2029         kfree(ns_dummy);
2030
2031         return nfs_ok;
2032 }
2033
2034 static __be32
2035 nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp,
2036                          union nfsd4_op_u *u)
2037 {
2038         struct nfsd4_copy_notify *cn = &u->copy_notify;
2039         __be32 status;
2040
2041         memset(cn, 0, sizeof(*cn));
2042         cn->cpn_src = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_src));
2043         if (cn->cpn_src == NULL)
2044                 return nfserr_jukebox;
2045         cn->cpn_dst = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_dst));
2046         if (cn->cpn_dst == NULL)
2047                 return nfserr_jukebox;
2048
2049         status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid);
2050         if (status)
2051                 return status;
2052         return nfsd4_decode_nl4_server(argp, cn->cpn_dst);
2053 }
2054
2055 static __be32
2056 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
2057                             union nfsd4_op_u *u)
2058 {
2059         struct nfsd4_offload_status *os = &u->offload_status;
2060         os->count = 0;
2061         os->status = 0;
2062         return nfsd4_decode_stateid4(argp, &os->stateid);
2063 }
2064
2065 static __be32
2066 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
2067 {
2068         struct nfsd4_seek *seek = &u->seek;
2069         __be32 status;
2070
2071         status = nfsd4_decode_stateid4(argp, &seek->seek_stateid);
2072         if (status)
2073                 return status;
2074         if (xdr_stream_decode_u64(argp->xdr, &seek->seek_offset) < 0)
2075                 return nfserr_bad_xdr;
2076         if (xdr_stream_decode_u32(argp->xdr, &seek->seek_whence) < 0)
2077                 return nfserr_bad_xdr;
2078
2079         seek->seek_eof = 0;
2080         seek->seek_pos = 0;
2081         return nfs_ok;
2082 }
2083
2084 static __be32
2085 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
2086 {
2087         struct nfsd4_clone *clone = &u->clone;
2088         __be32 status;
2089
2090         status = nfsd4_decode_stateid4(argp, &clone->cl_src_stateid);
2091         if (status)
2092                 return status;
2093         status = nfsd4_decode_stateid4(argp, &clone->cl_dst_stateid);
2094         if (status)
2095                 return status;
2096         if (xdr_stream_decode_u64(argp->xdr, &clone->cl_src_pos) < 0)
2097                 return nfserr_bad_xdr;
2098         if (xdr_stream_decode_u64(argp->xdr, &clone->cl_dst_pos) < 0)
2099                 return nfserr_bad_xdr;
2100         if (xdr_stream_decode_u64(argp->xdr, &clone->cl_count) < 0)
2101                 return nfserr_bad_xdr;
2102
2103         return nfs_ok;
2104 }
2105
2106 /*
2107  * XDR data that is more than PAGE_SIZE in size is normally part of a
2108  * read or write. However, the size of extended attributes is limited
2109  * by the maximum request size, and then further limited by the underlying
2110  * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX
2111  * is 64k). Since there is no kvec- or page-based interface to xattrs,
2112  * and we're not dealing with contiguous pages, we need to do some copying.
2113  */
2114
2115 /*
2116  * Decode data into buffer.
2117  */
2118 static __be32
2119 nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr,
2120                        char **bufp, u32 buflen)
2121 {
2122         struct page **pages = xdr->pages;
2123         struct kvec *head = xdr->head;
2124         char *tmp, *dp;
2125         u32 len;
2126
2127         if (buflen <= head->iov_len) {
2128                 /*
2129                  * We're in luck, the head has enough space. Just return
2130                  * the head, no need for copying.
2131                  */
2132                 *bufp = head->iov_base;
2133                 return 0;
2134         }
2135
2136         tmp = svcxdr_tmpalloc(argp, buflen);
2137         if (tmp == NULL)
2138                 return nfserr_jukebox;
2139
2140         dp = tmp;
2141         memcpy(dp, head->iov_base, head->iov_len);
2142         buflen -= head->iov_len;
2143         dp += head->iov_len;
2144
2145         while (buflen > 0) {
2146                 len = min_t(u32, buflen, PAGE_SIZE);
2147                 memcpy(dp, page_address(*pages), len);
2148
2149                 buflen -= len;
2150                 dp += len;
2151                 pages++;
2152         }
2153
2154         *bufp = tmp;
2155         return 0;
2156 }
2157
2158 /*
2159  * Get a user extended attribute name from the XDR buffer.
2160  * It will not have the "user." prefix, so prepend it.
2161  * Lastly, check for nul characters in the name.
2162  */
2163 static __be32
2164 nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep)
2165 {
2166         char *name, *sp, *dp;
2167         u32 namelen, cnt;
2168         __be32 *p;
2169
2170         if (xdr_stream_decode_u32(argp->xdr, &namelen) < 0)
2171                 return nfserr_bad_xdr;
2172         if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN))
2173                 return nfserr_nametoolong;
2174         if (namelen == 0)
2175                 return nfserr_bad_xdr;
2176         p = xdr_inline_decode(argp->xdr, namelen);
2177         if (!p)
2178                 return nfserr_bad_xdr;
2179         name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1);
2180         if (!name)
2181                 return nfserr_jukebox;
2182         memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
2183
2184         /*
2185          * Copy the extended attribute name over while checking for 0
2186          * characters.
2187          */
2188         sp = (char *)p;
2189         dp = name + XATTR_USER_PREFIX_LEN;
2190         cnt = namelen;
2191
2192         while (cnt-- > 0) {
2193                 if (*sp == '\0')
2194                         return nfserr_bad_xdr;
2195                 *dp++ = *sp++;
2196         }
2197         *dp = '\0';
2198
2199         *namep = name;
2200
2201         return nfs_ok;
2202 }
2203
2204 /*
2205  * A GETXATTR op request comes without a length specifier. We just set the
2206  * maximum length for the reply based on XATTR_SIZE_MAX and the maximum
2207  * channel reply size. nfsd_getxattr will probe the length of the xattr,
2208  * check it against getxa_len, and allocate + return the value.
2209  */
2210 static __be32
2211 nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp,
2212                       union nfsd4_op_u *u)
2213 {
2214         struct nfsd4_getxattr *getxattr = &u->getxattr;
2215         __be32 status;
2216         u32 maxcount;
2217
2218         memset(getxattr, 0, sizeof(*getxattr));
2219         status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name);
2220         if (status)
2221                 return status;
2222
2223         maxcount = svc_max_payload(argp->rqstp);
2224         maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2225
2226         getxattr->getxa_len = maxcount;
2227         return nfs_ok;
2228 }
2229
2230 static __be32
2231 nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp,
2232                       union nfsd4_op_u *u)
2233 {
2234         struct nfsd4_setxattr *setxattr = &u->setxattr;
2235         u32 flags, maxcount, size;
2236         __be32 status;
2237
2238         memset(setxattr, 0, sizeof(*setxattr));
2239
2240         if (xdr_stream_decode_u32(argp->xdr, &flags) < 0)
2241                 return nfserr_bad_xdr;
2242
2243         if (flags > SETXATTR4_REPLACE)
2244                 return nfserr_inval;
2245         setxattr->setxa_flags = flags;
2246
2247         status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name);
2248         if (status)
2249                 return status;
2250
2251         maxcount = svc_max_payload(argp->rqstp);
2252         maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2253
2254         if (xdr_stream_decode_u32(argp->xdr, &size) < 0)
2255                 return nfserr_bad_xdr;
2256         if (size > maxcount)
2257                 return nfserr_xattr2big;
2258
2259         setxattr->setxa_len = size;
2260         if (size > 0) {
2261                 struct xdr_buf payload;
2262
2263                 if (!xdr_stream_subsegment(argp->xdr, &payload, size))
2264                         return nfserr_bad_xdr;
2265                 status = nfsd4_vbuf_from_vector(argp, &payload,
2266                                                 &setxattr->setxa_buf, size);
2267         }
2268
2269         return nfs_ok;
2270 }
2271
2272 static __be32
2273 nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp,
2274                         union nfsd4_op_u *u)
2275 {
2276         struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
2277         u32 maxcount;
2278
2279         memset(listxattrs, 0, sizeof(*listxattrs));
2280
2281         if (xdr_stream_decode_u64(argp->xdr, &listxattrs->lsxa_cookie) < 0)
2282                 return nfserr_bad_xdr;
2283
2284         /*
2285          * If the cookie  is too large to have even one user.x attribute
2286          * plus trailing '\0' left in a maximum size buffer, it's invalid.
2287          */
2288         if (listxattrs->lsxa_cookie >=
2289             (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2)))
2290                 return nfserr_badcookie;
2291
2292         if (xdr_stream_decode_u32(argp->xdr, &maxcount) < 0)
2293                 return nfserr_bad_xdr;
2294         if (maxcount < 8)
2295                 /* Always need at least 2 words (length and one character) */
2296                 return nfserr_inval;
2297
2298         maxcount = min(maxcount, svc_max_payload(argp->rqstp));
2299         listxattrs->lsxa_maxcount = maxcount;
2300
2301         return nfs_ok;
2302 }
2303
2304 static __be32
2305 nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp,
2306                          union nfsd4_op_u *u)
2307 {
2308         struct nfsd4_removexattr *removexattr = &u->removexattr;
2309         memset(removexattr, 0, sizeof(*removexattr));
2310         return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name);
2311 }
2312
2313 static __be32
2314 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
2315 {
2316         return nfs_ok;
2317 }
2318
2319 static __be32
2320 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
2321 {
2322         return nfserr_notsupp;
2323 }
2324
2325 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u);
2326
2327 static const nfsd4_dec nfsd4_dec_ops[] = {
2328         [OP_ACCESS]             = nfsd4_decode_access,
2329         [OP_CLOSE]              = nfsd4_decode_close,
2330         [OP_COMMIT]             = nfsd4_decode_commit,
2331         [OP_CREATE]             = nfsd4_decode_create,
2332         [OP_DELEGPURGE]         = nfsd4_decode_notsupp,
2333         [OP_DELEGRETURN]        = nfsd4_decode_delegreturn,
2334         [OP_GETATTR]            = nfsd4_decode_getattr,
2335         [OP_GETFH]              = nfsd4_decode_noop,
2336         [OP_LINK]               = nfsd4_decode_link,
2337         [OP_LOCK]               = nfsd4_decode_lock,
2338         [OP_LOCKT]              = nfsd4_decode_lockt,
2339         [OP_LOCKU]              = nfsd4_decode_locku,
2340         [OP_LOOKUP]             = nfsd4_decode_lookup,
2341         [OP_LOOKUPP]            = nfsd4_decode_noop,
2342         [OP_NVERIFY]            = nfsd4_decode_verify,
2343         [OP_OPEN]               = nfsd4_decode_open,
2344         [OP_OPENATTR]           = nfsd4_decode_notsupp,
2345         [OP_OPEN_CONFIRM]       = nfsd4_decode_open_confirm,
2346         [OP_OPEN_DOWNGRADE]     = nfsd4_decode_open_downgrade,
2347         [OP_PUTFH]              = nfsd4_decode_putfh,
2348         [OP_PUTPUBFH]           = nfsd4_decode_putpubfh,
2349         [OP_PUTROOTFH]          = nfsd4_decode_noop,
2350         [OP_READ]               = nfsd4_decode_read,
2351         [OP_READDIR]            = nfsd4_decode_readdir,
2352         [OP_READLINK]           = nfsd4_decode_noop,
2353         [OP_REMOVE]             = nfsd4_decode_remove,
2354         [OP_RENAME]             = nfsd4_decode_rename,
2355         [OP_RENEW]              = nfsd4_decode_renew,
2356         [OP_RESTOREFH]          = nfsd4_decode_noop,
2357         [OP_SAVEFH]             = nfsd4_decode_noop,
2358         [OP_SECINFO]            = nfsd4_decode_secinfo,
2359         [OP_SETATTR]            = nfsd4_decode_setattr,
2360         [OP_SETCLIENTID]        = nfsd4_decode_setclientid,
2361         [OP_SETCLIENTID_CONFIRM] = nfsd4_decode_setclientid_confirm,
2362         [OP_VERIFY]             = nfsd4_decode_verify,
2363         [OP_WRITE]              = nfsd4_decode_write,
2364         [OP_RELEASE_LOCKOWNER]  = nfsd4_decode_release_lockowner,
2365
2366         /* new operations for NFSv4.1 */
2367         [OP_BACKCHANNEL_CTL]    = nfsd4_decode_backchannel_ctl,
2368         [OP_BIND_CONN_TO_SESSION] = nfsd4_decode_bind_conn_to_session,
2369         [OP_EXCHANGE_ID]        = nfsd4_decode_exchange_id,
2370         [OP_CREATE_SESSION]     = nfsd4_decode_create_session,
2371         [OP_DESTROY_SESSION]    = nfsd4_decode_destroy_session,
2372         [OP_FREE_STATEID]       = nfsd4_decode_free_stateid,
2373         [OP_GET_DIR_DELEGATION] = nfsd4_decode_notsupp,
2374 #ifdef CONFIG_NFSD_PNFS
2375         [OP_GETDEVICEINFO]      = nfsd4_decode_getdeviceinfo,
2376         [OP_GETDEVICELIST]      = nfsd4_decode_notsupp,
2377         [OP_LAYOUTCOMMIT]       = nfsd4_decode_layoutcommit,
2378         [OP_LAYOUTGET]          = nfsd4_decode_layoutget,
2379         [OP_LAYOUTRETURN]       = nfsd4_decode_layoutreturn,
2380 #else
2381         [OP_GETDEVICEINFO]      = nfsd4_decode_notsupp,
2382         [OP_GETDEVICELIST]      = nfsd4_decode_notsupp,
2383         [OP_LAYOUTCOMMIT]       = nfsd4_decode_notsupp,
2384         [OP_LAYOUTGET]          = nfsd4_decode_notsupp,
2385         [OP_LAYOUTRETURN]       = nfsd4_decode_notsupp,
2386 #endif
2387         [OP_SECINFO_NO_NAME]    = nfsd4_decode_secinfo_no_name,
2388         [OP_SEQUENCE]           = nfsd4_decode_sequence,
2389         [OP_SET_SSV]            = nfsd4_decode_notsupp,
2390         [OP_TEST_STATEID]       = nfsd4_decode_test_stateid,
2391         [OP_WANT_DELEGATION]    = nfsd4_decode_notsupp,
2392         [OP_DESTROY_CLIENTID]   = nfsd4_decode_destroy_clientid,
2393         [OP_RECLAIM_COMPLETE]   = nfsd4_decode_reclaim_complete,
2394
2395         /* new operations for NFSv4.2 */
2396         [OP_ALLOCATE]           = nfsd4_decode_fallocate,
2397         [OP_COPY]               = nfsd4_decode_copy,
2398         [OP_COPY_NOTIFY]        = nfsd4_decode_copy_notify,
2399         [OP_DEALLOCATE]         = nfsd4_decode_fallocate,
2400         [OP_IO_ADVISE]          = nfsd4_decode_notsupp,
2401         [OP_LAYOUTERROR]        = nfsd4_decode_notsupp,
2402         [OP_LAYOUTSTATS]        = nfsd4_decode_notsupp,
2403         [OP_OFFLOAD_CANCEL]     = nfsd4_decode_offload_status,
2404         [OP_OFFLOAD_STATUS]     = nfsd4_decode_offload_status,
2405         [OP_READ_PLUS]          = nfsd4_decode_read,
2406         [OP_SEEK]               = nfsd4_decode_seek,
2407         [OP_WRITE_SAME]         = nfsd4_decode_notsupp,
2408         [OP_CLONE]              = nfsd4_decode_clone,
2409         /* RFC 8276 extended atributes operations */
2410         [OP_GETXATTR]           = nfsd4_decode_getxattr,
2411         [OP_SETXATTR]           = nfsd4_decode_setxattr,
2412         [OP_LISTXATTRS]         = nfsd4_decode_listxattrs,
2413         [OP_REMOVEXATTR]        = nfsd4_decode_removexattr,
2414 };
2415
2416 static inline bool
2417 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
2418 {
2419         if (op->opnum < FIRST_NFS4_OP)
2420                 return false;
2421         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
2422                 return false;
2423         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
2424                 return false;
2425         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
2426                 return false;
2427         return true;
2428 }
2429
2430 static bool
2431 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
2432 {
2433         struct nfsd4_op *op;
2434         bool cachethis = false;
2435         int auth_slack= argp->rqstp->rq_auth_slack;
2436         int max_reply = auth_slack + 8; /* opcnt, status */
2437         int readcount = 0;
2438         int readbytes = 0;
2439         __be32 *p;
2440         int i;
2441
2442         if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0)
2443                 return false;
2444         max_reply += XDR_UNIT;
2445         argp->tag = NULL;
2446         if (unlikely(argp->taglen)) {
2447                 if (argp->taglen > NFSD4_MAX_TAGLEN)
2448                         return false;
2449                 p = xdr_inline_decode(argp->xdr, argp->taglen);
2450                 if (!p)
2451                         return false;
2452                 argp->tag = svcxdr_savemem(argp, p, argp->taglen);
2453                 if (!argp->tag)
2454                         return false;
2455                 max_reply += xdr_align_size(argp->taglen);
2456         }
2457
2458         if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0)
2459                 return false;
2460         if (xdr_stream_decode_u32(argp->xdr, &argp->client_opcnt) < 0)
2461                 return false;
2462         argp->opcnt = min_t(u32, argp->client_opcnt,
2463                             NFSD_MAX_OPS_PER_COMPOUND);
2464
2465         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
2466                 argp->ops = vcalloc(argp->opcnt, sizeof(*argp->ops));
2467                 if (!argp->ops) {
2468                         argp->ops = argp->iops;
2469                         return false;
2470                 }
2471         }
2472
2473         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
2474                 argp->opcnt = 0;
2475
2476         for (i = 0; i < argp->opcnt; i++) {
2477                 op = &argp->ops[i];
2478                 op->replay = NULL;
2479
2480                 if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0)
2481                         return false;
2482                 if (nfsd4_opnum_in_range(argp, op)) {
2483                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
2484                         if (op->status != nfs_ok)
2485                                 trace_nfsd_compound_decode_err(argp->rqstp,
2486                                                                argp->opcnt, i,
2487                                                                op->opnum,
2488                                                                op->status);
2489                 } else {
2490                         op->opnum = OP_ILLEGAL;
2491                         op->status = nfserr_op_illegal;
2492                 }
2493                 op->opdesc = OPDESC(op);
2494                 /*
2495                  * We'll try to cache the result in the DRC if any one
2496                  * op in the compound wants to be cached:
2497                  */
2498                 cachethis |= nfsd4_cache_this_op(op);
2499
2500                 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) {
2501                         readcount++;
2502                         readbytes += nfsd4_max_reply(argp->rqstp, op);
2503                 } else
2504                         max_reply += nfsd4_max_reply(argp->rqstp, op);
2505                 /*
2506                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
2507                  * (Special case because it will just skip encoding this
2508                  * if it runs out of xdr buffer space, and it is the only
2509                  * operation that behaves this way.)
2510                  */
2511                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
2512                         max_reply += NFS4_OPAQUE_LIMIT;
2513
2514                 if (op->status) {
2515                         argp->opcnt = i+1;
2516                         break;
2517                 }
2518         }
2519         /* Sessions make the DRC unnecessary: */
2520         if (argp->minorversion)
2521                 cachethis = false;
2522         svc_reserve(argp->rqstp, max_reply + readbytes);
2523         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
2524
2525         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
2526                 __clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
2527
2528         return true;
2529 }
2530
2531 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
2532                              struct svc_export *exp)
2533 {
2534         if (exp->ex_flags & NFSEXP_V4ROOT) {
2535                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
2536                 *p++ = 0;
2537         } else
2538                 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2539         return p;
2540 }
2541
2542 /*
2543  * ctime (in NFSv4, time_metadata) is not writeable, and the client
2544  * doesn't really care what resolution could theoretically be stored by
2545  * the filesystem.
2546  *
2547  * The client cares how close together changes can be while still
2548  * guaranteeing ctime changes.  For most filesystems (which have
2549  * timestamps with nanosecond fields) that is limited by the resolution
2550  * of the time returned from current_time() (which I'm assuming to be
2551  * 1/HZ).
2552  */
2553 static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2554 {
2555         struct timespec64 ts;
2556         u32 ns;
2557
2558         ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2559         ts = ns_to_timespec64(ns);
2560
2561         p = xdr_encode_hyper(p, ts.tv_sec);
2562         *p++ = cpu_to_be32(ts.tv_nsec);
2563
2564         return p;
2565 }
2566
2567 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2568 {
2569         *p++ = cpu_to_be32(c->atomic);
2570         p = xdr_encode_hyper(p, c->before_change);
2571         p = xdr_encode_hyper(p, c->after_change);
2572         return p;
2573 }
2574
2575 /* Encode as an array of strings the string given with components
2576  * separated @sep, escaped with esc_enter and esc_exit.
2577  */
2578 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2579                                           char *components, char esc_enter,
2580                                           char esc_exit)
2581 {
2582         __be32 *p;
2583         __be32 pathlen;
2584         int pathlen_offset;
2585         int strlen, count=0;
2586         char *str, *end, *next;
2587
2588         dprintk("nfsd4_encode_components(%s)\n", components);
2589
2590         pathlen_offset = xdr->buf->len;
2591         p = xdr_reserve_space(xdr, 4);
2592         if (!p)
2593                 return nfserr_resource;
2594         p++; /* We will fill this in with @count later */
2595
2596         end = str = components;
2597         while (*end) {
2598                 bool found_esc = false;
2599
2600                 /* try to parse as esc_start, ..., esc_end, sep */
2601                 if (*str == esc_enter) {
2602                         for (; *end && (*end != esc_exit); end++)
2603                                 /* find esc_exit or end of string */;
2604                         next = end + 1;
2605                         if (*end && (!*next || *next == sep)) {
2606                                 str++;
2607                                 found_esc = true;
2608                         }
2609                 }
2610
2611                 if (!found_esc)
2612                         for (; *end && (*end != sep); end++)
2613                                 /* find sep or end of string */;
2614
2615                 strlen = end - str;
2616                 if (strlen) {
2617                         p = xdr_reserve_space(xdr, strlen + 4);
2618                         if (!p)
2619                                 return nfserr_resource;
2620                         p = xdr_encode_opaque(p, str, strlen);
2621                         count++;
2622                 }
2623                 else
2624                         end++;
2625                 if (found_esc)
2626                         end = next;
2627
2628                 str = end;
2629         }
2630         pathlen = htonl(count);
2631         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2632         return 0;
2633 }
2634
2635 /* Encode as an array of strings the string given with components
2636  * separated @sep.
2637  */
2638 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2639                                       char *components)
2640 {
2641         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2642 }
2643
2644 /*
2645  * encode a location element of a fs_locations structure
2646  */
2647 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2648                                         struct nfsd4_fs_location *location)
2649 {
2650         __be32 status;
2651
2652         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2653                                                 '[', ']');
2654         if (status)
2655                 return status;
2656         status = nfsd4_encode_components(xdr, '/', location->path);
2657         if (status)
2658                 return status;
2659         return 0;
2660 }
2661
2662 /*
2663  * Encode a path in RFC3530 'pathname4' format
2664  */
2665 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2666                                 const struct path *root,
2667                                 const struct path *path)
2668 {
2669         struct path cur = *path;
2670         __be32 *p;
2671         struct dentry **components = NULL;
2672         unsigned int ncomponents = 0;
2673         __be32 err = nfserr_jukebox;
2674
2675         dprintk("nfsd4_encode_components(");
2676
2677         path_get(&cur);
2678         /* First walk the path up to the nfsd root, and store the
2679          * dentries/path components in an array.
2680          */
2681         for (;;) {
2682                 if (path_equal(&cur, root))
2683                         break;
2684                 if (cur.dentry == cur.mnt->mnt_root) {
2685                         if (follow_up(&cur))
2686                                 continue;
2687                         goto out_free;
2688                 }
2689                 if ((ncomponents & 15) == 0) {
2690                         struct dentry **new;
2691                         new = krealloc(components,
2692                                         sizeof(*new) * (ncomponents + 16),
2693                                         GFP_KERNEL);
2694                         if (!new)
2695                                 goto out_free;
2696                         components = new;
2697                 }
2698                 components[ncomponents++] = cur.dentry;
2699                 cur.dentry = dget_parent(cur.dentry);
2700         }
2701         err = nfserr_resource;
2702         p = xdr_reserve_space(xdr, 4);
2703         if (!p)
2704                 goto out_free;
2705         *p++ = cpu_to_be32(ncomponents);
2706
2707         while (ncomponents) {
2708                 struct dentry *dentry = components[ncomponents - 1];
2709                 unsigned int len;
2710
2711                 spin_lock(&dentry->d_lock);
2712                 len = dentry->d_name.len;
2713                 p = xdr_reserve_space(xdr, len + 4);
2714                 if (!p) {
2715                         spin_unlock(&dentry->d_lock);
2716                         goto out_free;
2717                 }
2718                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2719                 dprintk("/%pd", dentry);
2720                 spin_unlock(&dentry->d_lock);
2721                 dput(dentry);
2722                 ncomponents--;
2723         }
2724
2725         err = 0;
2726 out_free:
2727         dprintk(")\n");
2728         while (ncomponents)
2729                 dput(components[--ncomponents]);
2730         kfree(components);
2731         path_put(&cur);
2732         return err;
2733 }
2734
2735 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2736                         struct svc_rqst *rqstp, const struct path *path)
2737 {
2738         struct svc_export *exp_ps;
2739         __be32 res;
2740
2741         exp_ps = rqst_find_fsidzero_export(rqstp);
2742         if (IS_ERR(exp_ps))
2743                 return nfserrno(PTR_ERR(exp_ps));
2744         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2745         exp_put(exp_ps);
2746         return res;
2747 }
2748
2749 /*
2750  *  encode a fs_locations structure
2751  */
2752 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2753                         struct svc_rqst *rqstp, struct svc_export *exp)
2754 {
2755         __be32 status;
2756         int i;
2757         __be32 *p;
2758         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2759
2760         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2761         if (status)
2762                 return status;
2763         p = xdr_reserve_space(xdr, 4);
2764         if (!p)
2765                 return nfserr_resource;
2766         *p++ = cpu_to_be32(fslocs->locations_count);
2767         for (i=0; i<fslocs->locations_count; i++) {
2768                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2769                 if (status)
2770                         return status;
2771         }
2772         return 0;
2773 }
2774
2775 static u32 nfs4_file_type(umode_t mode)
2776 {
2777         switch (mode & S_IFMT) {
2778         case S_IFIFO:   return NF4FIFO;
2779         case S_IFCHR:   return NF4CHR;
2780         case S_IFDIR:   return NF4DIR;
2781         case S_IFBLK:   return NF4BLK;
2782         case S_IFLNK:   return NF4LNK;
2783         case S_IFREG:   return NF4REG;
2784         case S_IFSOCK:  return NF4SOCK;
2785         default:        return NF4BAD;
2786         }
2787 }
2788
2789 static inline __be32
2790 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2791                      struct nfs4_ace *ace)
2792 {
2793         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2794                 return nfs4_acl_write_who(xdr, ace->whotype);
2795         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2796                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2797         else
2798                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2799 }
2800
2801 static inline __be32
2802 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2803 {
2804         __be32          *p;
2805         unsigned long   i = hweight_long(layout_types);
2806
2807         p = xdr_reserve_space(xdr, 4 + 4 * i);
2808         if (!p)
2809                 return nfserr_resource;
2810
2811         *p++ = cpu_to_be32(i);
2812
2813         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2814                 if (layout_types & (1 << i))
2815                         *p++ = cpu_to_be32(i);
2816
2817         return 0;
2818 }
2819
2820 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2821                               FATTR4_WORD0_RDATTR_ERROR)
2822 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2823 #define WORD2_ABSENT_FS_ATTRS 0
2824
2825 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2826 static inline __be32
2827 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2828                             void *context, int len)
2829 {
2830         __be32 *p;
2831
2832         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2833         if (!p)
2834                 return nfserr_resource;
2835
2836         /*
2837          * For now we use a 0 here to indicate the null translation; in
2838          * the future we may place a call to translation code here.
2839          */
2840         *p++ = cpu_to_be32(0); /* lfs */
2841         *p++ = cpu_to_be32(0); /* pi */
2842         p = xdr_encode_opaque(p, context, len);
2843         return 0;
2844 }
2845 #else
2846 static inline __be32
2847 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2848                             void *context, int len)
2849 { return 0; }
2850 #endif
2851
2852 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2853 {
2854         /* As per referral draft:  */
2855         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2856             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2857                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2858                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2859                         *rdattr_err = NFSERR_MOVED;
2860                 else
2861                         return nfserr_moved;
2862         }
2863         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2864         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2865         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2866         return 0;
2867 }
2868
2869
2870 static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino)
2871 {
2872         struct path path = exp->ex_path;
2873         struct kstat stat;
2874         int err;
2875
2876         path_get(&path);
2877         while (follow_up(&path)) {
2878                 if (path.dentry != path.mnt->mnt_root)
2879                         break;
2880         }
2881         err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT);
2882         path_put(&path);
2883         if (!err)
2884                 *pino = stat.ino;
2885         return err;
2886 }
2887
2888 static __be32
2889 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2890 {
2891         __be32 *p;
2892
2893         if (bmval2) {
2894                 p = xdr_reserve_space(xdr, 16);
2895                 if (!p)
2896                         goto out_resource;
2897                 *p++ = cpu_to_be32(3);
2898                 *p++ = cpu_to_be32(bmval0);
2899                 *p++ = cpu_to_be32(bmval1);
2900                 *p++ = cpu_to_be32(bmval2);
2901         } else if (bmval1) {
2902                 p = xdr_reserve_space(xdr, 12);
2903                 if (!p)
2904                         goto out_resource;
2905                 *p++ = cpu_to_be32(2);
2906                 *p++ = cpu_to_be32(bmval0);
2907                 *p++ = cpu_to_be32(bmval1);
2908         } else {
2909                 p = xdr_reserve_space(xdr, 8);
2910                 if (!p)
2911                         goto out_resource;
2912                 *p++ = cpu_to_be32(1);
2913                 *p++ = cpu_to_be32(bmval0);
2914         }
2915
2916         return 0;
2917 out_resource:
2918         return nfserr_resource;
2919 }
2920
2921 /*
2922  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2923  * ourselves.
2924  */
2925 static __be32
2926 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2927                 struct svc_export *exp,
2928                 struct dentry *dentry, u32 *bmval,
2929                 struct svc_rqst *rqstp, int ignore_crossmnt)
2930 {
2931         u32 bmval0 = bmval[0];
2932         u32 bmval1 = bmval[1];
2933         u32 bmval2 = bmval[2];
2934         struct kstat stat;
2935         struct svc_fh *tempfh = NULL;
2936         struct kstatfs statfs;
2937         __be32 *p, *attrlen_p;
2938         int starting_len = xdr->buf->len;
2939         int attrlen_offset;
2940         u32 dummy;
2941         u64 dummy64;
2942         u32 rdattr_err = 0;
2943         __be32 status;
2944         int err;
2945         struct nfs4_acl *acl = NULL;
2946 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2947         void *context = NULL;
2948         int contextlen;
2949 #endif
2950         bool contextsupport = false;
2951         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2952         u32 minorversion = resp->cstate.minorversion;
2953         struct path path = {
2954                 .mnt    = exp->ex_path.mnt,
2955                 .dentry = dentry,
2956         };
2957         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2958
2959         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2960         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2961
2962         if (exp->ex_fslocs.migrated) {
2963                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2964                 if (status)
2965                         goto out;
2966         }
2967
2968         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2969         if (err)
2970                 goto out_nfserr;
2971         if (!(stat.result_mask & STATX_BTIME))
2972                 /* underlying FS does not offer btime so we can't share it */
2973                 bmval1 &= ~FATTR4_WORD1_TIME_CREATE;
2974         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2975                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2976             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2977                        FATTR4_WORD1_SPACE_TOTAL))) {
2978                 err = vfs_statfs(&path, &statfs);
2979                 if (err)
2980                         goto out_nfserr;
2981         }
2982         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2983                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2984                 status = nfserr_jukebox;
2985                 if (!tempfh)
2986                         goto out;
2987                 fh_init(tempfh, NFS4_FHSIZE);
2988                 status = fh_compose(tempfh, exp, dentry, NULL);
2989                 if (status)
2990                         goto out;
2991                 fhp = tempfh;
2992         }
2993         if (bmval0 & FATTR4_WORD0_ACL) {
2994                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2995                 if (err == -EOPNOTSUPP)
2996                         bmval0 &= ~FATTR4_WORD0_ACL;
2997                 else if (err == -EINVAL) {
2998                         status = nfserr_attrnotsupp;
2999                         goto out;
3000                 } else if (err != 0)
3001                         goto out_nfserr;
3002         }
3003
3004 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3005         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
3006              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
3007                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
3008                         err = security_inode_getsecctx(d_inode(dentry),
3009                                                 &context, &contextlen);
3010                 else
3011                         err = -EOPNOTSUPP;
3012                 contextsupport = (err == 0);
3013                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
3014                         if (err == -EOPNOTSUPP)
3015                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
3016                         else if (err)
3017                                 goto out_nfserr;
3018                 }
3019         }
3020 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3021
3022         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
3023         if (status)
3024                 goto out;
3025
3026         attrlen_offset = xdr->buf->len;
3027         attrlen_p = xdr_reserve_space(xdr, XDR_UNIT);
3028         if (!attrlen_p)
3029                 goto out_resource;
3030
3031         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
3032                 u32 supp[3];
3033
3034                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
3035
3036                 if (!IS_POSIXACL(dentry->d_inode))
3037                         supp[0] &= ~FATTR4_WORD0_ACL;
3038                 if (!contextsupport)
3039                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3040                 if (!supp[2]) {
3041                         p = xdr_reserve_space(xdr, 12);
3042                         if (!p)
3043                                 goto out_resource;
3044                         *p++ = cpu_to_be32(2);
3045                         *p++ = cpu_to_be32(supp[0]);
3046                         *p++ = cpu_to_be32(supp[1]);
3047                 } else {
3048                         p = xdr_reserve_space(xdr, 16);
3049                         if (!p)
3050                                 goto out_resource;
3051                         *p++ = cpu_to_be32(3);
3052                         *p++ = cpu_to_be32(supp[0]);
3053                         *p++ = cpu_to_be32(supp[1]);
3054                         *p++ = cpu_to_be32(supp[2]);
3055                 }
3056         }
3057         if (bmval0 & FATTR4_WORD0_TYPE) {
3058                 p = xdr_reserve_space(xdr, 4);
3059                 if (!p)
3060                         goto out_resource;
3061                 dummy = nfs4_file_type(stat.mode);
3062                 if (dummy == NF4BAD) {
3063                         status = nfserr_serverfault;
3064                         goto out;
3065                 }
3066                 *p++ = cpu_to_be32(dummy);
3067         }
3068         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
3069                 p = xdr_reserve_space(xdr, 4);
3070                 if (!p)
3071                         goto out_resource;
3072                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
3073                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
3074                 else
3075                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
3076                                                 NFS4_FH_VOL_RENAME);
3077         }
3078         if (bmval0 & FATTR4_WORD0_CHANGE) {
3079                 p = xdr_reserve_space(xdr, 8);
3080                 if (!p)
3081                         goto out_resource;
3082                 p = encode_change(p, &stat, d_inode(dentry), exp);
3083         }
3084         if (bmval0 & FATTR4_WORD0_SIZE) {
3085                 p = xdr_reserve_space(xdr, 8);
3086                 if (!p)
3087                         goto out_resource;
3088                 p = xdr_encode_hyper(p, stat.size);
3089         }
3090         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
3091                 p = xdr_reserve_space(xdr, 4);
3092                 if (!p)
3093                         goto out_resource;
3094                 *p++ = cpu_to_be32(1);
3095         }
3096         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
3097                 p = xdr_reserve_space(xdr, 4);
3098                 if (!p)
3099                         goto out_resource;
3100                 *p++ = cpu_to_be32(1);
3101         }
3102         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
3103                 p = xdr_reserve_space(xdr, 4);
3104                 if (!p)
3105                         goto out_resource;
3106                 *p++ = cpu_to_be32(0);
3107         }
3108         if (bmval0 & FATTR4_WORD0_FSID) {
3109                 p = xdr_reserve_space(xdr, 16);
3110                 if (!p)
3111                         goto out_resource;
3112                 if (exp->ex_fslocs.migrated) {
3113                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
3114                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
3115                 } else switch(fsid_source(fhp)) {
3116                 case FSIDSOURCE_FSID:
3117                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
3118                         p = xdr_encode_hyper(p, (u64)0);
3119                         break;
3120                 case FSIDSOURCE_DEV:
3121                         *p++ = cpu_to_be32(0);
3122                         *p++ = cpu_to_be32(MAJOR(stat.dev));
3123                         *p++ = cpu_to_be32(0);
3124                         *p++ = cpu_to_be32(MINOR(stat.dev));
3125                         break;
3126                 case FSIDSOURCE_UUID:
3127                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
3128                                                                 EX_UUID_LEN);
3129                         break;
3130                 }
3131         }
3132         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
3133                 p = xdr_reserve_space(xdr, 4);
3134                 if (!p)
3135                         goto out_resource;
3136                 *p++ = cpu_to_be32(0);
3137         }
3138         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
3139                 p = xdr_reserve_space(xdr, 4);
3140                 if (!p)
3141                         goto out_resource;
3142                 *p++ = cpu_to_be32(nn->nfsd4_lease);
3143         }
3144         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
3145                 p = xdr_reserve_space(xdr, 4);
3146                 if (!p)
3147                         goto out_resource;
3148                 *p++ = cpu_to_be32(rdattr_err);
3149         }
3150         if (bmval0 & FATTR4_WORD0_ACL) {
3151                 struct nfs4_ace *ace;
3152
3153                 if (acl == NULL) {
3154                         p = xdr_reserve_space(xdr, 4);
3155                         if (!p)
3156                                 goto out_resource;
3157
3158                         *p++ = cpu_to_be32(0);
3159                         goto out_acl;
3160                 }
3161                 p = xdr_reserve_space(xdr, 4);
3162                 if (!p)
3163                         goto out_resource;
3164                 *p++ = cpu_to_be32(acl->naces);
3165
3166                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
3167                         p = xdr_reserve_space(xdr, 4*3);
3168                         if (!p)
3169                                 goto out_resource;
3170                         *p++ = cpu_to_be32(ace->type);
3171                         *p++ = cpu_to_be32(ace->flag);
3172                         *p++ = cpu_to_be32(ace->access_mask &
3173                                                         NFS4_ACE_MASK_ALL);
3174                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
3175                         if (status)
3176                                 goto out;
3177                 }
3178         }
3179 out_acl:
3180         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
3181                 p = xdr_reserve_space(xdr, 4);
3182                 if (!p)
3183                         goto out_resource;
3184                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
3185                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
3186         }
3187         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
3188                 p = xdr_reserve_space(xdr, 4);
3189                 if (!p)
3190                         goto out_resource;
3191                 *p++ = cpu_to_be32(1);
3192         }
3193         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
3194                 p = xdr_reserve_space(xdr, 4);
3195                 if (!p)
3196                         goto out_resource;
3197                 *p++ = cpu_to_be32(0);
3198         }
3199         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
3200                 p = xdr_reserve_space(xdr, 4);
3201                 if (!p)
3202                         goto out_resource;
3203                 *p++ = cpu_to_be32(1);
3204         }
3205         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
3206                 p = xdr_reserve_space(xdr, 4);
3207                 if (!p)
3208                         goto out_resource;
3209                 *p++ = cpu_to_be32(1);
3210         }
3211         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
3212                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
3213                 if (!p)
3214                         goto out_resource;
3215                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw,
3216                                         fhp->fh_handle.fh_size);
3217         }
3218         if (bmval0 & FATTR4_WORD0_FILEID) {
3219                 p = xdr_reserve_space(xdr, 8);
3220                 if (!p)
3221                         goto out_resource;
3222                 p = xdr_encode_hyper(p, stat.ino);
3223         }
3224         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
3225                 p = xdr_reserve_space(xdr, 8);
3226                 if (!p)
3227                         goto out_resource;
3228                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
3229         }
3230         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
3231                 p = xdr_reserve_space(xdr, 8);
3232                 if (!p)
3233                         goto out_resource;
3234                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
3235         }
3236         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
3237                 p = xdr_reserve_space(xdr, 8);
3238                 if (!p)
3239                         goto out_resource;
3240                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
3241         }
3242         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
3243                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
3244                 if (status)
3245                         goto out;
3246         }
3247         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
3248                 p = xdr_reserve_space(xdr, 4);
3249                 if (!p)
3250                         goto out_resource;
3251                 *p++ = cpu_to_be32(1);
3252         }
3253         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
3254                 p = xdr_reserve_space(xdr, 8);
3255                 if (!p)
3256                         goto out_resource;
3257                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
3258         }
3259         if (bmval0 & FATTR4_WORD0_MAXLINK) {
3260                 p = xdr_reserve_space(xdr, 4);
3261                 if (!p)
3262                         goto out_resource;
3263                 *p++ = cpu_to_be32(255);
3264         }
3265         if (bmval0 & FATTR4_WORD0_MAXNAME) {
3266                 p = xdr_reserve_space(xdr, 4);
3267                 if (!p)
3268                         goto out_resource;
3269                 *p++ = cpu_to_be32(statfs.f_namelen);
3270         }
3271         if (bmval0 & FATTR4_WORD0_MAXREAD) {
3272                 p = xdr_reserve_space(xdr, 8);
3273                 if (!p)
3274                         goto out_resource;
3275                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
3276         }
3277         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
3278                 p = xdr_reserve_space(xdr, 8);
3279                 if (!p)
3280                         goto out_resource;
3281                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
3282         }
3283         if (bmval1 & FATTR4_WORD1_MODE) {
3284                 p = xdr_reserve_space(xdr, 4);
3285                 if (!p)
3286                         goto out_resource;
3287                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
3288         }
3289         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
3290                 p = xdr_reserve_space(xdr, 4);
3291                 if (!p)
3292                         goto out_resource;
3293                 *p++ = cpu_to_be32(1);
3294         }
3295         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
3296                 p = xdr_reserve_space(xdr, 4);
3297                 if (!p)
3298                         goto out_resource;
3299                 *p++ = cpu_to_be32(stat.nlink);
3300         }
3301         if (bmval1 & FATTR4_WORD1_OWNER) {
3302                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
3303                 if (status)
3304                         goto out;
3305         }
3306         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
3307                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
3308                 if (status)
3309                         goto out;
3310         }
3311         if (bmval1 & FATTR4_WORD1_RAWDEV) {
3312                 p = xdr_reserve_space(xdr, 8);
3313                 if (!p)
3314                         goto out_resource;
3315                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
3316                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
3317         }
3318         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
3319                 p = xdr_reserve_space(xdr, 8);
3320                 if (!p)
3321                         goto out_resource;
3322                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
3323                 p = xdr_encode_hyper(p, dummy64);
3324         }
3325         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
3326                 p = xdr_reserve_space(xdr, 8);
3327                 if (!p)
3328                         goto out_resource;
3329                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
3330                 p = xdr_encode_hyper(p, dummy64);
3331         }
3332         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
3333                 p = xdr_reserve_space(xdr, 8);
3334                 if (!p)
3335                         goto out_resource;
3336                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
3337                 p = xdr_encode_hyper(p, dummy64);
3338         }
3339         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
3340                 p = xdr_reserve_space(xdr, 8);
3341                 if (!p)
3342                         goto out_resource;
3343                 dummy64 = (u64)stat.blocks << 9;
3344                 p = xdr_encode_hyper(p, dummy64);
3345         }
3346         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
3347                 p = xdr_reserve_space(xdr, 12);
3348                 if (!p)
3349                         goto out_resource;
3350                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
3351                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
3352         }
3353         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
3354                 p = xdr_reserve_space(xdr, 12);
3355                 if (!p)
3356                         goto out_resource;
3357                 p = encode_time_delta(p, d_inode(dentry));
3358         }
3359         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
3360                 p = xdr_reserve_space(xdr, 12);
3361                 if (!p)
3362                         goto out_resource;
3363                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
3364                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
3365         }
3366         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
3367                 p = xdr_reserve_space(xdr, 12);
3368                 if (!p)
3369                         goto out_resource;
3370                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
3371                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
3372         }
3373         if (bmval1 & FATTR4_WORD1_TIME_CREATE) {
3374                 p = xdr_reserve_space(xdr, 12);
3375                 if (!p)
3376                         goto out_resource;
3377                 p = xdr_encode_hyper(p, (s64)stat.btime.tv_sec);
3378                 *p++ = cpu_to_be32(stat.btime.tv_nsec);
3379         }
3380         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
3381                 u64 ino = stat.ino;
3382
3383                 p = xdr_reserve_space(xdr, 8);
3384                 if (!p)
3385                         goto out_resource;
3386                 /*
3387                  * Get ino of mountpoint in parent filesystem, if not ignoring
3388                  * crossmount and this is the root of a cross-mounted
3389                  * filesystem.
3390                  */
3391                 if (ignore_crossmnt == 0 &&
3392                     dentry == exp->ex_path.mnt->mnt_root) {
3393                         err = nfsd4_get_mounted_on_ino(exp, &ino);
3394                         if (err)
3395                                 goto out_nfserr;
3396                 }
3397                 p = xdr_encode_hyper(p, ino);
3398         }
3399 #ifdef CONFIG_NFSD_PNFS
3400         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
3401                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
3402                 if (status)
3403                         goto out;
3404         }
3405
3406         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
3407                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
3408                 if (status)
3409                         goto out;
3410         }
3411
3412         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
3413                 p = xdr_reserve_space(xdr, 4);
3414                 if (!p)
3415                         goto out_resource;
3416                 *p++ = cpu_to_be32(stat.blksize);
3417         }
3418 #endif /* CONFIG_NFSD_PNFS */
3419         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
3420                 u32 supp[3];
3421
3422                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
3423                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
3424                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
3425                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
3426
3427                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
3428                 if (status)
3429                         goto out;
3430         }
3431
3432 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3433         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
3434                 status = nfsd4_encode_security_label(xdr, rqstp, context,
3435                                                                 contextlen);
3436                 if (status)
3437                         goto out;
3438         }
3439 #endif
3440
3441         if (bmval2 & FATTR4_WORD2_XATTR_SUPPORT) {
3442                 p = xdr_reserve_space(xdr, 4);
3443                 if (!p)
3444                         goto out_resource;
3445                 err = xattr_supported_namespace(d_inode(dentry),
3446                                                 XATTR_USER_PREFIX);
3447                 *p++ = cpu_to_be32(err == 0);
3448         }
3449
3450         *attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT);
3451         status = nfs_ok;
3452
3453 out:
3454 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3455         if (context)
3456                 security_release_secctx(context, contextlen);
3457 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3458         kfree(acl);
3459         if (tempfh) {
3460                 fh_put(tempfh);
3461                 kfree(tempfh);
3462         }
3463         if (status)
3464                 xdr_truncate_encode(xdr, starting_len);
3465         return status;
3466 out_nfserr:
3467         status = nfserrno(err);
3468         goto out;
3469 out_resource:
3470         status = nfserr_resource;
3471         goto out;
3472 }
3473
3474 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3475                                 struct xdr_buf *buf, __be32 *p, int bytes)
3476 {
3477         xdr->scratch.iov_len = 0;
3478         memset(buf, 0, sizeof(struct xdr_buf));
3479         buf->head[0].iov_base = p;
3480         buf->head[0].iov_len = 0;
3481         buf->len = 0;
3482         xdr->buf = buf;
3483         xdr->iov = buf->head;
3484         xdr->p = p;
3485         xdr->end = (void *)p + bytes;
3486         buf->buflen = bytes;
3487 }
3488
3489 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3490                         struct svc_fh *fhp, struct svc_export *exp,
3491                         struct dentry *dentry, u32 *bmval,
3492                         struct svc_rqst *rqstp, int ignore_crossmnt)
3493 {
3494         struct xdr_buf dummy;
3495         struct xdr_stream xdr;
3496         __be32 ret;
3497
3498         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
3499         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
3500                                                         ignore_crossmnt);
3501         *p = xdr.p;
3502         return ret;
3503 }
3504
3505 static inline int attributes_need_mount(u32 *bmval)
3506 {
3507         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3508                 return 1;
3509         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3510                 return 1;
3511         return 0;
3512 }
3513
3514 static __be32
3515 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
3516                         const char *name, int namlen)
3517 {
3518         struct svc_export *exp = cd->rd_fhp->fh_export;
3519         struct dentry *dentry;
3520         __be32 nfserr;
3521         int ignore_crossmnt = 0;
3522
3523         dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
3524         if (IS_ERR(dentry))
3525                 return nfserrno(PTR_ERR(dentry));
3526
3527         exp_get(exp);
3528         /*
3529          * In the case of a mountpoint, the client may be asking for
3530          * attributes that are only properties of the underlying filesystem
3531          * as opposed to the cross-mounted file system. In such a case,
3532          * we will not follow the cross mount and will fill the attribtutes
3533          * directly from the mountpoint dentry.
3534          */
3535         if (nfsd_mountpoint(dentry, exp)) {
3536                 int err;
3537
3538                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3539                                 && !attributes_need_mount(cd->rd_bmval)) {
3540                         ignore_crossmnt = 1;
3541                         goto out_encode;
3542                 }
3543                 /*
3544                  * Why the heck aren't we just using nfsd_lookup??
3545                  * Different "."/".." handling?  Something else?
3546                  * At least, add a comment here to explain....
3547                  */
3548                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3549                 if (err) {
3550                         nfserr = nfserrno(err);
3551                         goto out_put;
3552                 }
3553                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3554                 if (nfserr)
3555                         goto out_put;
3556
3557         }
3558 out_encode:
3559         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3560                                         cd->rd_rqstp, ignore_crossmnt);
3561 out_put:
3562         dput(dentry);
3563         exp_put(exp);
3564         return nfserr;
3565 }
3566
3567 static __be32 *
3568 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3569 {
3570         __be32 *p;
3571
3572         p = xdr_reserve_space(xdr, 20);
3573         if (!p)
3574                 return NULL;
3575         *p++ = htonl(2);
3576         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3577         *p++ = htonl(0);                         /* bmval1 */
3578
3579         *p++ = htonl(4);     /* attribute length */
3580         *p++ = nfserr;       /* no htonl */
3581         return p;
3582 }
3583
3584 static int
3585 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3586                     loff_t offset, u64 ino, unsigned int d_type)
3587 {
3588         struct readdir_cd *ccd = ccdv;
3589         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3590         struct xdr_stream *xdr = cd->xdr;
3591         int start_offset = xdr->buf->len;
3592         int cookie_offset;
3593         u32 name_and_cookie;
3594         int entry_bytes;
3595         __be32 nfserr = nfserr_toosmall;
3596         __be64 wire_offset;
3597         __be32 *p;
3598
3599         /* In nfsv4, "." and ".." never make it onto the wire.. */
3600         if (name && isdotent(name, namlen)) {
3601                 cd->common.err = nfs_ok;
3602                 return 0;
3603         }
3604
3605         if (cd->cookie_offset) {
3606                 wire_offset = cpu_to_be64(offset);
3607                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3608                                                         &wire_offset, 8);
3609         }
3610
3611         p = xdr_reserve_space(xdr, 4);
3612         if (!p)
3613                 goto fail;
3614         *p++ = xdr_one;                             /* mark entry present */
3615         cookie_offset = xdr->buf->len;
3616         p = xdr_reserve_space(xdr, 3*4 + namlen);
3617         if (!p)
3618                 goto fail;
3619         p = xdr_encode_hyper(p, OFFSET_MAX);        /* offset of next entry */
3620         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3621
3622         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3623         switch (nfserr) {
3624         case nfs_ok:
3625                 break;
3626         case nfserr_resource:
3627                 nfserr = nfserr_toosmall;
3628                 goto fail;
3629         case nfserr_noent:
3630                 xdr_truncate_encode(xdr, start_offset);
3631                 goto skip_entry;
3632         default:
3633                 /*
3634                  * If the client requested the RDATTR_ERROR attribute,
3635                  * we stuff the error code into this attribute
3636                  * and continue.  If this attribute was not requested,
3637                  * then in accordance with the spec, we fail the
3638                  * entire READDIR operation(!)
3639                  */
3640                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3641                         goto fail;
3642                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3643                 if (p == NULL) {
3644                         nfserr = nfserr_toosmall;
3645                         goto fail;
3646                 }
3647         }
3648         nfserr = nfserr_toosmall;
3649         entry_bytes = xdr->buf->len - start_offset;
3650         if (entry_bytes > cd->rd_maxcount)
3651                 goto fail;
3652         cd->rd_maxcount -= entry_bytes;
3653         /*
3654          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and
3655          * notes that it could be zero. If it is zero, then the server
3656          * should enforce only the rd_maxcount value.
3657          */
3658         if (cd->rd_dircount) {
3659                 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3660                 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3661                         goto fail;
3662                 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3663                 if (!cd->rd_dircount)
3664                         cd->rd_maxcount = 0;
3665         }
3666
3667         cd->cookie_offset = cookie_offset;
3668 skip_entry:
3669         cd->common.err = nfs_ok;
3670         return 0;
3671 fail:
3672         xdr_truncate_encode(xdr, start_offset);
3673         cd->common.err = nfserr;
3674         return -EINVAL;
3675 }
3676
3677 static __be32
3678 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3679 {
3680         __be32 *p;
3681
3682         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3683         if (!p)
3684                 return nfserr_resource;
3685         *p++ = cpu_to_be32(sid->si_generation);
3686         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3687                                         sizeof(stateid_opaque_t));
3688         return 0;
3689 }
3690
3691 static __be32
3692 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr,
3693                     union nfsd4_op_u *u)
3694 {
3695         struct nfsd4_access *access = &u->access;
3696         struct xdr_stream *xdr = resp->xdr;
3697         __be32 *p;
3698
3699         p = xdr_reserve_space(xdr, 8);
3700         if (!p)
3701                 return nfserr_resource;
3702         *p++ = cpu_to_be32(access->ac_supported);
3703         *p++ = cpu_to_be32(access->ac_resp_access);
3704         return 0;
3705 }
3706
3707 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3708                                                 union nfsd4_op_u *u)
3709 {
3710         struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
3711         struct xdr_stream *xdr = resp->xdr;
3712         __be32 *p;
3713
3714         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3715         if (!p)
3716                 return nfserr_resource;
3717         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3718                                         NFS4_MAX_SESSIONID_LEN);
3719         *p++ = cpu_to_be32(bcts->dir);
3720         /* Upshifting from TCP to RDMA is not supported */
3721         *p++ = cpu_to_be32(0);
3722         return 0;
3723 }
3724
3725 static __be32
3726 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr,
3727                    union nfsd4_op_u *u)
3728 {
3729         struct nfsd4_close *close = &u->close;
3730         struct xdr_stream *xdr = resp->xdr;
3731
3732         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3733 }
3734
3735
3736 static __be32
3737 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr,
3738                     union nfsd4_op_u *u)
3739 {
3740         struct nfsd4_commit *commit = &u->commit;
3741         struct xdr_stream *xdr = resp->xdr;
3742         __be32 *p;
3743
3744         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3745         if (!p)
3746                 return nfserr_resource;
3747         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3748                                                 NFS4_VERIFIER_SIZE);
3749         return 0;
3750 }
3751
3752 static __be32
3753 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr,
3754                     union nfsd4_op_u *u)
3755 {
3756         struct nfsd4_create *create = &u->create;
3757         struct xdr_stream *xdr = resp->xdr;
3758         __be32 *p;
3759
3760         p = xdr_reserve_space(xdr, 20);
3761         if (!p)
3762                 return nfserr_resource;
3763         encode_cinfo(p, &create->cr_cinfo);
3764         return nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3765                         create->cr_bmval[1], create->cr_bmval[2]);
3766 }
3767
3768 static __be32
3769 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr,
3770                      union nfsd4_op_u *u)
3771 {
3772         struct nfsd4_getattr *getattr = &u->getattr;
3773         struct svc_fh *fhp = getattr->ga_fhp;
3774         struct xdr_stream *xdr = resp->xdr;
3775
3776         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3777                                     getattr->ga_bmval, resp->rqstp, 0);
3778 }
3779
3780 static __be32
3781 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr,
3782                    union nfsd4_op_u *u)
3783 {
3784         struct svc_fh **fhpp = &u->getfh;
3785         struct xdr_stream *xdr = resp->xdr;
3786         struct svc_fh *fhp = *fhpp;
3787         unsigned int len;
3788         __be32 *p;
3789
3790         len = fhp->fh_handle.fh_size;
3791         p = xdr_reserve_space(xdr, len + 4);
3792         if (!p)
3793                 return nfserr_resource;
3794         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, len);
3795         return 0;
3796 }
3797
3798 /*
3799 * Including all fields other than the name, a LOCK4denied structure requires
3800 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3801 */
3802 static __be32
3803 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3804 {
3805         struct xdr_netobj *conf = &ld->ld_owner;
3806         __be32 *p;
3807
3808 again:
3809         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3810         if (!p) {
3811                 /*
3812                  * Don't fail to return the result just because we can't
3813                  * return the conflicting open:
3814                  */
3815                 if (conf->len) {
3816                         kfree(conf->data);
3817                         conf->len = 0;
3818                         conf->data = NULL;
3819                         goto again;
3820                 }
3821                 return nfserr_resource;
3822         }
3823         p = xdr_encode_hyper(p, ld->ld_start);
3824         p = xdr_encode_hyper(p, ld->ld_length);
3825         *p++ = cpu_to_be32(ld->ld_type);
3826         if (conf->len) {
3827                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3828                 p = xdr_encode_opaque(p, conf->data, conf->len);
3829                 kfree(conf->data);
3830         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3831                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3832                 *p++ = cpu_to_be32(0); /* length of owner name */
3833         }
3834         return nfserr_denied;
3835 }
3836
3837 static __be32
3838 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr,
3839                   union nfsd4_op_u *u)
3840 {
3841         struct nfsd4_lock *lock = &u->lock;
3842         struct xdr_stream *xdr = resp->xdr;
3843
3844         if (!nfserr)
3845                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3846         else if (nfserr == nfserr_denied)
3847                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3848
3849         return nfserr;
3850 }
3851
3852 static __be32
3853 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr,
3854                    union nfsd4_op_u *u)
3855 {
3856         struct nfsd4_lockt *lockt = &u->lockt;
3857         struct xdr_stream *xdr = resp->xdr;
3858
3859         if (nfserr == nfserr_denied)
3860                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3861         return nfserr;
3862 }
3863
3864 static __be32
3865 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr,
3866                    union nfsd4_op_u *u)
3867 {
3868         struct nfsd4_locku *locku = &u->locku;
3869         struct xdr_stream *xdr = resp->xdr;
3870
3871         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3872 }
3873
3874
3875 static __be32
3876 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr,
3877                   union nfsd4_op_u *u)
3878 {
3879         struct nfsd4_link *link = &u->link;
3880         struct xdr_stream *xdr = resp->xdr;
3881         __be32 *p;
3882
3883         p = xdr_reserve_space(xdr, 20);
3884         if (!p)
3885                 return nfserr_resource;
3886         p = encode_cinfo(p, &link->li_cinfo);
3887         return 0;
3888 }
3889
3890
3891 static __be32
3892 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr,
3893                   union nfsd4_op_u *u)
3894 {
3895         struct nfsd4_open *open = &u->open;
3896         struct xdr_stream *xdr = resp->xdr;
3897         __be32 *p;
3898
3899         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3900         if (nfserr)
3901                 return nfserr;
3902         p = xdr_reserve_space(xdr, 24);
3903         if (!p)
3904                 return nfserr_resource;
3905         p = encode_cinfo(p, &open->op_cinfo);
3906         *p++ = cpu_to_be32(open->op_rflags);
3907
3908         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3909                                         open->op_bmval[2]);
3910         if (nfserr)
3911                 return nfserr;
3912
3913         p = xdr_reserve_space(xdr, 4);
3914         if (!p)
3915                 return nfserr_resource;
3916
3917         *p++ = cpu_to_be32(open->op_delegate_type);
3918         switch (open->op_delegate_type) {
3919         case NFS4_OPEN_DELEGATE_NONE:
3920                 break;
3921         case NFS4_OPEN_DELEGATE_READ:
3922                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3923                 if (nfserr)
3924                         return nfserr;
3925                 p = xdr_reserve_space(xdr, 20);
3926                 if (!p)
3927                         return nfserr_resource;
3928                 *p++ = cpu_to_be32(open->op_recall);
3929
3930                 /*
3931                  * TODO: ACE's in delegations
3932                  */
3933                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3934                 *p++ = cpu_to_be32(0);
3935                 *p++ = cpu_to_be32(0);
3936                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3937                 break;
3938         case NFS4_OPEN_DELEGATE_WRITE:
3939                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3940                 if (nfserr)
3941                         return nfserr;
3942                 p = xdr_reserve_space(xdr, 32);
3943                 if (!p)
3944                         return nfserr_resource;
3945                 *p++ = cpu_to_be32(0);
3946
3947                 /*
3948                  * TODO: space_limit's in delegations
3949                  */
3950                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3951                 *p++ = cpu_to_be32(~(u32)0);
3952                 *p++ = cpu_to_be32(~(u32)0);
3953
3954                 /*
3955                  * TODO: ACE's in delegations
3956                  */
3957                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3958                 *p++ = cpu_to_be32(0);
3959                 *p++ = cpu_to_be32(0);
3960                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3961                 break;
3962         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3963                 switch (open->op_why_no_deleg) {
3964                 case WND4_CONTENTION:
3965                 case WND4_RESOURCE:
3966                         p = xdr_reserve_space(xdr, 8);
3967                         if (!p)
3968                                 return nfserr_resource;
3969                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3970                         /* deleg signaling not supported yet: */
3971                         *p++ = cpu_to_be32(0);
3972                         break;
3973                 default:
3974                         p = xdr_reserve_space(xdr, 4);
3975                         if (!p)
3976                                 return nfserr_resource;
3977                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3978                 }
3979                 break;
3980         default:
3981                 BUG();
3982         }
3983         /* XXX save filehandle here */
3984         return 0;
3985 }
3986
3987 static __be32
3988 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr,
3989                           union nfsd4_op_u *u)
3990 {
3991         struct nfsd4_open_confirm *oc = &u->open_confirm;
3992         struct xdr_stream *xdr = resp->xdr;
3993
3994         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3995 }
3996
3997 static __be32
3998 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr,
3999                             union nfsd4_op_u *u)
4000 {
4001         struct nfsd4_open_downgrade *od = &u->open_downgrade;
4002         struct xdr_stream *xdr = resp->xdr;
4003
4004         return nfsd4_encode_stateid(xdr, &od->od_stateid);
4005 }
4006
4007 static __be32 nfsd4_encode_splice_read(
4008                                 struct nfsd4_compoundres *resp,
4009                                 struct nfsd4_read *read,
4010                                 struct file *file, unsigned long maxcount)
4011 {
4012         struct xdr_stream *xdr = resp->xdr;
4013         struct xdr_buf *buf = xdr->buf;
4014         int status, space_left;
4015         __be32 nfserr;
4016
4017         /* Make sure there will be room for padding if needed */
4018         if (xdr->end - xdr->p < 1)
4019                 return nfserr_resource;
4020
4021         nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
4022                                   file, read->rd_offset, &maxcount,
4023                                   &read->rd_eof);
4024         read->rd_length = maxcount;
4025         if (nfserr)
4026                 goto out_err;
4027         status = svc_encode_result_payload(read->rd_rqstp,
4028                                            buf->head[0].iov_len, maxcount);
4029         if (status) {
4030                 nfserr = nfserrno(status);
4031                 goto out_err;
4032         }
4033
4034         buf->page_len = maxcount;
4035         buf->len += maxcount;
4036         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
4037                                                         / PAGE_SIZE;
4038
4039         /* Use rest of head for padding and remaining ops: */
4040         buf->tail[0].iov_base = xdr->p;
4041         buf->tail[0].iov_len = 0;
4042         xdr->iov = buf->tail;
4043         if (maxcount&3) {
4044                 int pad = 4 - (maxcount&3);
4045
4046                 *(xdr->p++) = 0;
4047
4048                 buf->tail[0].iov_base += maxcount&3;
4049                 buf->tail[0].iov_len = pad;
4050                 buf->len += pad;
4051         }
4052
4053         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
4054                                 buf->buflen - buf->len);
4055         buf->buflen = buf->len + space_left;
4056         xdr->end = (__be32 *)((void *)xdr->end + space_left);
4057
4058         return 0;
4059
4060 out_err:
4061         /*
4062          * nfsd_splice_actor may have already messed with the
4063          * page length; reset it so as not to confuse
4064          * xdr_truncate_encode in our caller.
4065          */
4066         buf->page_len = 0;
4067         return nfserr;
4068 }
4069
4070 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
4071                                  struct nfsd4_read *read,
4072                                  struct file *file, unsigned long maxcount)
4073 {
4074         struct xdr_stream *xdr = resp->xdr;
4075         unsigned int starting_len = xdr->buf->len;
4076         __be32 zero = xdr_zero;
4077         __be32 nfserr;
4078
4079         read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, maxcount);
4080         if (read->rd_vlen < 0)
4081                 return nfserr_resource;
4082
4083         nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
4084                             resp->rqstp->rq_vec, read->rd_vlen, &maxcount,
4085                             &read->rd_eof);
4086         read->rd_length = maxcount;
4087         if (nfserr)
4088                 return nfserr;
4089         if (svc_encode_result_payload(resp->rqstp, starting_len, maxcount))
4090                 return nfserr_io;
4091         xdr_truncate_encode(xdr, starting_len + xdr_align_size(maxcount));
4092
4093         write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero,
4094                                xdr_pad_size(maxcount));
4095         return nfs_ok;
4096 }
4097
4098 static __be32
4099 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
4100                   union nfsd4_op_u *u)
4101 {
4102         struct nfsd4_read *read = &u->read;
4103         bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags);
4104         unsigned long maxcount;
4105         struct xdr_stream *xdr = resp->xdr;
4106         struct file *file;
4107         int starting_len = xdr->buf->len;
4108         __be32 *p;
4109
4110         if (nfserr)
4111                 return nfserr;
4112         file = read->rd_nf->nf_file;
4113
4114         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
4115         if (!p) {
4116                 WARN_ON_ONCE(splice_ok);
4117                 return nfserr_resource;
4118         }
4119         if (resp->xdr->buf->page_len && splice_ok) {
4120                 WARN_ON_ONCE(1);
4121                 return nfserr_serverfault;
4122         }
4123         xdr_commit_encode(xdr);
4124
4125         maxcount = min_t(unsigned long, read->rd_length,
4126                          (xdr->buf->buflen - xdr->buf->len));
4127
4128         if (file->f_op->splice_read && splice_ok)
4129                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4130         else
4131                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
4132         if (nfserr) {
4133                 xdr_truncate_encode(xdr, starting_len);
4134                 return nfserr;
4135         }
4136
4137         p = xdr_encode_bool(p, read->rd_eof);
4138         *p = cpu_to_be32(read->rd_length);
4139         return nfs_ok;
4140 }
4141
4142 static __be32
4143 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr,
4144                       union nfsd4_op_u *u)
4145 {
4146         struct nfsd4_readlink *readlink = &u->readlink;
4147         __be32 *p, *maxcount_p, zero = xdr_zero;
4148         struct xdr_stream *xdr = resp->xdr;
4149         int length_offset = xdr->buf->len;
4150         int maxcount, status;
4151
4152         maxcount_p = xdr_reserve_space(xdr, XDR_UNIT);
4153         if (!maxcount_p)
4154                 return nfserr_resource;
4155         maxcount = PAGE_SIZE;
4156
4157         p = xdr_reserve_space(xdr, maxcount);
4158         if (!p)
4159                 return nfserr_resource;
4160         /*
4161          * XXX: By default, vfs_readlink() will truncate symlinks if they
4162          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
4163          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
4164          * that truncation occurred, and return NFS4ERR_RESOURCE.
4165          */
4166         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
4167                                                 (char *)p, &maxcount);
4168         if (nfserr == nfserr_isdir)
4169                 nfserr = nfserr_inval;
4170         if (nfserr)
4171                 goto out_err;
4172         status = svc_encode_result_payload(readlink->rl_rqstp, length_offset,
4173                                            maxcount);
4174         if (status) {
4175                 nfserr = nfserrno(status);
4176                 goto out_err;
4177         }
4178         *maxcount_p = cpu_to_be32(maxcount);
4179         xdr_truncate_encode(xdr, length_offset + 4 + xdr_align_size(maxcount));
4180         write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero,
4181                                xdr_pad_size(maxcount));
4182         return nfs_ok;
4183
4184 out_err:
4185         xdr_truncate_encode(xdr, length_offset);
4186         return nfserr;
4187 }
4188
4189 static __be32
4190 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr,
4191                      union nfsd4_op_u *u)
4192 {
4193         struct nfsd4_readdir *readdir = &u->readdir;
4194         int maxcount;
4195         int bytes_left;
4196         loff_t offset;
4197         __be64 wire_offset;
4198         struct xdr_stream *xdr = resp->xdr;
4199         int starting_len = xdr->buf->len;
4200         __be32 *p;
4201
4202         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
4203         if (!p)
4204                 return nfserr_resource;
4205
4206         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
4207         *p++ = cpu_to_be32(0);
4208         *p++ = cpu_to_be32(0);
4209         xdr->buf->head[0].iov_len = (char *)xdr->p -
4210                                     (char *)xdr->buf->head[0].iov_base;
4211
4212         /*
4213          * Number of bytes left for directory entries allowing for the
4214          * final 8 bytes of the readdir and a following failed op:
4215          */
4216         bytes_left = xdr->buf->buflen - xdr->buf->len
4217                         - COMPOUND_ERR_SLACK_SPACE - 8;
4218         if (bytes_left < 0) {
4219                 nfserr = nfserr_resource;
4220                 goto err_no_verf;
4221         }
4222         maxcount = svc_max_payload(resp->rqstp);
4223         maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
4224         /*
4225          * Note the rfc defines rd_maxcount as the size of the
4226          * READDIR4resok structure, which includes the verifier above
4227          * and the 8 bytes encoded at the end of this function:
4228          */
4229         if (maxcount < 16) {
4230                 nfserr = nfserr_toosmall;
4231                 goto err_no_verf;
4232         }
4233         maxcount = min_t(int, maxcount-16, bytes_left);
4234
4235         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
4236         if (!readdir->rd_dircount)
4237                 readdir->rd_dircount = svc_max_payload(resp->rqstp);
4238
4239         readdir->xdr = xdr;
4240         readdir->rd_maxcount = maxcount;
4241         readdir->common.err = 0;
4242         readdir->cookie_offset = 0;
4243
4244         offset = readdir->rd_cookie;
4245         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
4246                               &offset,
4247                               &readdir->common, nfsd4_encode_dirent);
4248         if (nfserr == nfs_ok &&
4249             readdir->common.err == nfserr_toosmall &&
4250             xdr->buf->len == starting_len + 8) {
4251                 /* nothing encoded; which limit did we hit?: */
4252                 if (maxcount - 16 < bytes_left)
4253                         /* It was the fault of rd_maxcount: */
4254                         nfserr = nfserr_toosmall;
4255                 else
4256                         /* We ran out of buffer space: */
4257                         nfserr = nfserr_resource;
4258         }
4259         if (nfserr)
4260                 goto err_no_verf;
4261
4262         if (readdir->cookie_offset) {
4263                 wire_offset = cpu_to_be64(offset);
4264                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
4265                                                         &wire_offset, 8);
4266         }
4267
4268         p = xdr_reserve_space(xdr, 8);
4269         if (!p) {
4270                 WARN_ON_ONCE(1);
4271                 goto err_no_verf;
4272         }
4273         *p++ = 0;       /* no more entries */
4274         *p++ = htonl(readdir->common.err == nfserr_eof);
4275
4276         return 0;
4277 err_no_verf:
4278         xdr_truncate_encode(xdr, starting_len);
4279         return nfserr;
4280 }
4281
4282 static __be32
4283 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr,
4284                     union nfsd4_op_u *u)
4285 {
4286         struct nfsd4_remove *remove = &u->remove;
4287         struct xdr_stream *xdr = resp->xdr;
4288         __be32 *p;
4289
4290         p = xdr_reserve_space(xdr, 20);
4291         if (!p)
4292                 return nfserr_resource;
4293         p = encode_cinfo(p, &remove->rm_cinfo);
4294         return 0;
4295 }
4296
4297 static __be32
4298 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr,
4299                     union nfsd4_op_u *u)
4300 {
4301         struct nfsd4_rename *rename = &u->rename;
4302         struct xdr_stream *xdr = resp->xdr;
4303         __be32 *p;
4304
4305         p = xdr_reserve_space(xdr, 40);
4306         if (!p)
4307                 return nfserr_resource;
4308         p = encode_cinfo(p, &rename->rn_sinfo);
4309         p = encode_cinfo(p, &rename->rn_tinfo);
4310         return 0;
4311 }
4312
4313 static __be32
4314 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
4315 {
4316         u32 i, nflavs, supported;
4317         struct exp_flavor_info *flavs;
4318         struct exp_flavor_info def_flavs[2];
4319         __be32 *p, *flavorsp;
4320         static bool report = true;
4321
4322         if (exp->ex_nflavors) {
4323                 flavs = exp->ex_flavors;
4324                 nflavs = exp->ex_nflavors;
4325         } else { /* Handling of some defaults in absence of real secinfo: */
4326                 flavs = def_flavs;
4327                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
4328                         nflavs = 2;
4329                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
4330                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
4331                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
4332                         nflavs = 1;
4333                         flavs[0].pseudoflavor
4334                                         = svcauth_gss_flavor(exp->ex_client);
4335                 } else {
4336                         nflavs = 1;
4337                         flavs[0].pseudoflavor
4338                                         = exp->ex_client->flavour->flavour;
4339                 }
4340         }
4341
4342         supported = 0;
4343         p = xdr_reserve_space(xdr, 4);
4344         if (!p)
4345                 return nfserr_resource;
4346         flavorsp = p++;         /* to be backfilled later */
4347
4348         for (i = 0; i < nflavs; i++) {
4349                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
4350                 struct rpcsec_gss_info info;
4351
4352                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
4353                         supported++;
4354                         p = xdr_reserve_space(xdr, 4 + 4 +
4355                                               XDR_LEN(info.oid.len) + 4 + 4);
4356                         if (!p)
4357                                 return nfserr_resource;
4358                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
4359                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
4360                         *p++ = cpu_to_be32(info.qop);
4361                         *p++ = cpu_to_be32(info.service);
4362                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
4363                         supported++;
4364                         p = xdr_reserve_space(xdr, 4);
4365                         if (!p)
4366                                 return nfserr_resource;
4367                         *p++ = cpu_to_be32(pf);
4368                 } else {
4369                         if (report)
4370                                 pr_warn("NFS: SECINFO: security flavor %u "
4371                                         "is not supported\n", pf);
4372                 }
4373         }
4374
4375         if (nflavs != supported)
4376                 report = false;
4377         *flavorsp = htonl(supported);
4378         return 0;
4379 }
4380
4381 static __be32
4382 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4383                      union nfsd4_op_u *u)
4384 {
4385         struct nfsd4_secinfo *secinfo = &u->secinfo;
4386         struct xdr_stream *xdr = resp->xdr;
4387
4388         return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
4389 }
4390
4391 static __be32
4392 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
4393                      union nfsd4_op_u *u)
4394 {
4395         struct nfsd4_secinfo_no_name *secinfo = &u->secinfo_no_name;
4396         struct xdr_stream *xdr = resp->xdr;
4397
4398         return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
4399 }
4400
4401 /*
4402  * The SETATTR encode routine is special -- it always encodes a bitmap,
4403  * regardless of the error status.
4404  */
4405 static __be32
4406 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4407                      union nfsd4_op_u *u)
4408 {
4409         struct nfsd4_setattr *setattr = &u->setattr;
4410         struct xdr_stream *xdr = resp->xdr;
4411         __be32 *p;
4412
4413         p = xdr_reserve_space(xdr, 16);
4414         if (!p)
4415                 return nfserr_resource;
4416         if (nfserr) {
4417                 *p++ = cpu_to_be32(3);
4418                 *p++ = cpu_to_be32(0);
4419                 *p++ = cpu_to_be32(0);
4420                 *p++ = cpu_to_be32(0);
4421         }
4422         else {
4423                 *p++ = cpu_to_be32(3);
4424                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
4425                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
4426                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
4427         }
4428         return nfserr;
4429 }
4430
4431 static __be32
4432 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr,
4433                          union nfsd4_op_u *u)
4434 {
4435         struct nfsd4_setclientid *scd = &u->setclientid;
4436         struct xdr_stream *xdr = resp->xdr;
4437         __be32 *p;
4438
4439         if (!nfserr) {
4440                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
4441                 if (!p)
4442                         return nfserr_resource;
4443                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
4444                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
4445                                                 NFS4_VERIFIER_SIZE);
4446         }
4447         else if (nfserr == nfserr_clid_inuse) {
4448                 p = xdr_reserve_space(xdr, 8);
4449                 if (!p)
4450                         return nfserr_resource;
4451                 *p++ = cpu_to_be32(0);
4452                 *p++ = cpu_to_be32(0);
4453         }
4454         return nfserr;
4455 }
4456
4457 static __be32
4458 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr,
4459                    union nfsd4_op_u *u)
4460 {
4461         struct nfsd4_write *write = &u->write;
4462         struct xdr_stream *xdr = resp->xdr;
4463         __be32 *p;
4464
4465         p = xdr_reserve_space(xdr, 16);
4466         if (!p)
4467                 return nfserr_resource;
4468         *p++ = cpu_to_be32(write->wr_bytes_written);
4469         *p++ = cpu_to_be32(write->wr_how_written);
4470         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4471                                                 NFS4_VERIFIER_SIZE);
4472         return 0;
4473 }
4474
4475 static __be32
4476 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
4477                          union nfsd4_op_u *u)
4478 {
4479         struct nfsd4_exchange_id *exid = &u->exchange_id;
4480         struct xdr_stream *xdr = resp->xdr;
4481         __be32 *p;
4482         char *major_id;
4483         char *server_scope;
4484         int major_id_sz;
4485         int server_scope_sz;
4486         uint64_t minor_id = 0;
4487         struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
4488
4489         major_id = nn->nfsd_name;
4490         major_id_sz = strlen(nn->nfsd_name);
4491         server_scope = nn->nfsd_name;
4492         server_scope_sz = strlen(nn->nfsd_name);
4493
4494         p = xdr_reserve_space(xdr,
4495                 8 /* eir_clientid */ +
4496                 4 /* eir_sequenceid */ +
4497                 4 /* eir_flags */ +
4498                 4 /* spr_how */);
4499         if (!p)
4500                 return nfserr_resource;
4501
4502         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
4503         *p++ = cpu_to_be32(exid->seqid);
4504         *p++ = cpu_to_be32(exid->flags);
4505
4506         *p++ = cpu_to_be32(exid->spa_how);
4507
4508         switch (exid->spa_how) {
4509         case SP4_NONE:
4510                 break;
4511         case SP4_MACH_CRED:
4512                 /* spo_must_enforce bitmap: */
4513                 nfserr = nfsd4_encode_bitmap(xdr,
4514                                         exid->spo_must_enforce[0],
4515                                         exid->spo_must_enforce[1],
4516                                         exid->spo_must_enforce[2]);
4517                 if (nfserr)
4518                         return nfserr;
4519                 /* spo_must_allow bitmap: */
4520                 nfserr = nfsd4_encode_bitmap(xdr,
4521                                         exid->spo_must_allow[0],
4522                                         exid->spo_must_allow[1],
4523                                         exid->spo_must_allow[2]);
4524                 if (nfserr)
4525                         return nfserr;
4526                 break;
4527         default:
4528                 WARN_ON_ONCE(1);
4529         }
4530
4531         p = xdr_reserve_space(xdr,
4532                 8 /* so_minor_id */ +
4533                 4 /* so_major_id.len */ +
4534                 (XDR_QUADLEN(major_id_sz) * 4) +
4535                 4 /* eir_server_scope.len */ +
4536                 (XDR_QUADLEN(server_scope_sz) * 4) +
4537                 4 /* eir_server_impl_id.count (0) */);
4538         if (!p)
4539                 return nfserr_resource;
4540
4541         /* The server_owner struct */
4542         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
4543         /* major id */
4544         p = xdr_encode_opaque(p, major_id, major_id_sz);
4545
4546         /* Server scope */
4547         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4548
4549         /* Implementation id */
4550         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
4551         return 0;
4552 }
4553
4554 static __be32
4555 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4556                             union nfsd4_op_u *u)
4557 {
4558         struct nfsd4_create_session *sess = &u->create_session;
4559         struct xdr_stream *xdr = resp->xdr;
4560         __be32 *p;
4561
4562         p = xdr_reserve_space(xdr, 24);
4563         if (!p)
4564                 return nfserr_resource;
4565         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4566                                         NFS4_MAX_SESSIONID_LEN);
4567         *p++ = cpu_to_be32(sess->seqid);
4568         *p++ = cpu_to_be32(sess->flags);
4569
4570         p = xdr_reserve_space(xdr, 28);
4571         if (!p)
4572                 return nfserr_resource;
4573         *p++ = cpu_to_be32(0); /* headerpadsz */
4574         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4575         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4576         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4577         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4578         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4579         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4580
4581         if (sess->fore_channel.nr_rdma_attrs) {
4582                 p = xdr_reserve_space(xdr, 4);
4583                 if (!p)
4584                         return nfserr_resource;
4585                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4586         }
4587
4588         p = xdr_reserve_space(xdr, 28);
4589         if (!p)
4590                 return nfserr_resource;
4591         *p++ = cpu_to_be32(0); /* headerpadsz */
4592         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4593         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4594         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4595         *p++ = cpu_to_be32(sess->back_channel.maxops);
4596         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4597         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4598
4599         if (sess->back_channel.nr_rdma_attrs) {
4600                 p = xdr_reserve_space(xdr, 4);
4601                 if (!p)
4602                         return nfserr_resource;
4603                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4604         }
4605         return 0;
4606 }
4607
4608 static __be32
4609 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4610                       union nfsd4_op_u *u)
4611 {
4612         struct nfsd4_sequence *seq = &u->sequence;
4613         struct xdr_stream *xdr = resp->xdr;
4614         __be32 *p;
4615
4616         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4617         if (!p)
4618                 return nfserr_resource;
4619         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4620                                         NFS4_MAX_SESSIONID_LEN);
4621         *p++ = cpu_to_be32(seq->seqid);
4622         *p++ = cpu_to_be32(seq->slotid);
4623         /* Note slotid's are numbered from zero: */
4624         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4625         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4626         *p++ = cpu_to_be32(seq->status_flags);
4627
4628         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4629         return 0;
4630 }
4631
4632 static __be32
4633 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4634                           union nfsd4_op_u *u)
4635 {
4636         struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
4637         struct xdr_stream *xdr = resp->xdr;
4638         struct nfsd4_test_stateid_id *stateid, *next;
4639         __be32 *p;
4640
4641         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4642         if (!p)
4643                 return nfserr_resource;
4644         *p++ = htonl(test_stateid->ts_num_ids);
4645
4646         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4647                 *p++ = stateid->ts_id_status;
4648         }
4649
4650         return 0;
4651 }
4652
4653 #ifdef CONFIG_NFSD_PNFS
4654 static __be32
4655 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4656                 union nfsd4_op_u *u)
4657 {
4658         struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
4659         struct xdr_stream *xdr = resp->xdr;
4660         const struct nfsd4_layout_ops *ops;
4661         u32 starting_len = xdr->buf->len, needed_len;
4662         __be32 *p;
4663
4664         p = xdr_reserve_space(xdr, 4);
4665         if (!p)
4666                 return nfserr_resource;
4667
4668         *p++ = cpu_to_be32(gdev->gd_layout_type);
4669
4670         /* If maxcount is 0 then just update notifications */
4671         if (gdev->gd_maxcount != 0) {
4672                 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4673                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4674                 if (nfserr) {
4675                         /*
4676                          * We don't bother to burden the layout drivers with
4677                          * enforcing gd_maxcount, just tell the client to
4678                          * come back with a bigger buffer if it's not enough.
4679                          */
4680                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4681                                 goto toosmall;
4682                         return nfserr;
4683                 }
4684         }
4685
4686         if (gdev->gd_notify_types) {
4687                 p = xdr_reserve_space(xdr, 4 + 4);
4688                 if (!p)
4689                         return nfserr_resource;
4690                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4691                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4692         } else {
4693                 p = xdr_reserve_space(xdr, 4);
4694                 if (!p)
4695                         return nfserr_resource;
4696                 *p++ = 0;
4697         }
4698
4699         return 0;
4700 toosmall:
4701         dprintk("%s: maxcount too small\n", __func__);
4702         needed_len = xdr->buf->len + 4 /* notifications */;
4703         xdr_truncate_encode(xdr, starting_len);
4704         p = xdr_reserve_space(xdr, 4);
4705         if (!p)
4706                 return nfserr_resource;
4707         *p++ = cpu_to_be32(needed_len);
4708         return nfserr_toosmall;
4709 }
4710
4711 static __be32
4712 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4713                 union nfsd4_op_u *u)
4714 {
4715         struct nfsd4_layoutget *lgp = &u->layoutget;
4716         struct xdr_stream *xdr = resp->xdr;
4717         const struct nfsd4_layout_ops *ops;
4718         __be32 *p;
4719
4720         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4721         if (!p)
4722                 return nfserr_resource;
4723
4724         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4725         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4726         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4727                                     sizeof(stateid_opaque_t));
4728
4729         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4730         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4731         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4732         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4733         *p++ = cpu_to_be32(lgp->lg_layout_type);
4734
4735         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4736         return ops->encode_layoutget(xdr, lgp);
4737 }
4738
4739 static __be32
4740 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4741                           union nfsd4_op_u *u)
4742 {
4743         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
4744         struct xdr_stream *xdr = resp->xdr;
4745         __be32 *p;
4746
4747         p = xdr_reserve_space(xdr, 4);
4748         if (!p)
4749                 return nfserr_resource;
4750         *p++ = cpu_to_be32(lcp->lc_size_chg);
4751         if (lcp->lc_size_chg) {
4752                 p = xdr_reserve_space(xdr, 8);
4753                 if (!p)
4754                         return nfserr_resource;
4755                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4756         }
4757
4758         return 0;
4759 }
4760
4761 static __be32
4762 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4763                 union nfsd4_op_u *u)
4764 {
4765         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
4766         struct xdr_stream *xdr = resp->xdr;
4767         __be32 *p;
4768
4769         p = xdr_reserve_space(xdr, 4);
4770         if (!p)
4771                 return nfserr_resource;
4772         *p++ = cpu_to_be32(lrp->lrs_present);
4773         if (lrp->lrs_present)
4774                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4775         return 0;
4776 }
4777 #endif /* CONFIG_NFSD_PNFS */
4778
4779 static __be32
4780 nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
4781                 struct nfsd42_write_res *write, bool sync)
4782 {
4783         __be32 *p;
4784         p = xdr_reserve_space(resp->xdr, 4);
4785         if (!p)
4786                 return nfserr_resource;
4787
4788         if (sync)
4789                 *p++ = cpu_to_be32(0);
4790         else {
4791                 __be32 nfserr;
4792                 *p++ = cpu_to_be32(1);
4793                 nfserr = nfsd4_encode_stateid(resp->xdr, &write->cb_stateid);
4794                 if (nfserr)
4795                         return nfserr;
4796         }
4797         p = xdr_reserve_space(resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
4798         if (!p)
4799                 return nfserr_resource;
4800
4801         p = xdr_encode_hyper(p, write->wr_bytes_written);
4802         *p++ = cpu_to_be32(write->wr_stable_how);
4803         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4804                                     NFS4_VERIFIER_SIZE);
4805         return nfs_ok;
4806 }
4807
4808 static __be32
4809 nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns)
4810 {
4811         struct xdr_stream *xdr = resp->xdr;
4812         struct nfs42_netaddr *addr;
4813         __be32 *p;
4814
4815         p = xdr_reserve_space(xdr, 4);
4816         *p++ = cpu_to_be32(ns->nl4_type);
4817
4818         switch (ns->nl4_type) {
4819         case NL4_NETADDR:
4820                 addr = &ns->u.nl4_addr;
4821
4822                 /* netid_len, netid, uaddr_len, uaddr (port included
4823                  * in RPCBIND_MAXUADDRLEN)
4824                  */
4825                 p = xdr_reserve_space(xdr,
4826                         4 /* netid len */ +
4827                         (XDR_QUADLEN(addr->netid_len) * 4) +
4828                         4 /* uaddr len */ +
4829                         (XDR_QUADLEN(addr->addr_len) * 4));
4830                 if (!p)
4831                         return nfserr_resource;
4832
4833                 *p++ = cpu_to_be32(addr->netid_len);
4834                 p = xdr_encode_opaque_fixed(p, addr->netid,
4835                                             addr->netid_len);
4836                 *p++ = cpu_to_be32(addr->addr_len);
4837                 p = xdr_encode_opaque_fixed(p, addr->addr,
4838                                         addr->addr_len);
4839                 break;
4840         default:
4841                 WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR);
4842                 return nfserr_inval;
4843         }
4844
4845         return 0;
4846 }
4847
4848 static __be32
4849 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4850                   union nfsd4_op_u *u)
4851 {
4852         struct nfsd4_copy *copy = &u->copy;
4853         __be32 *p;
4854
4855         nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
4856                                          nfsd4_copy_is_sync(copy));
4857         if (nfserr)
4858                 return nfserr;
4859
4860         p = xdr_reserve_space(resp->xdr, 4 + 4);
4861         *p++ = xdr_one; /* cr_consecutive */
4862         *p = nfsd4_copy_is_sync(copy) ? xdr_one : xdr_zero;
4863         return 0;
4864 }
4865
4866 static __be32
4867 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
4868                             union nfsd4_op_u *u)
4869 {
4870         struct nfsd4_offload_status *os = &u->offload_status;
4871         struct xdr_stream *xdr = resp->xdr;
4872         __be32 *p;
4873
4874         p = xdr_reserve_space(xdr, 8 + 4);
4875         if (!p)
4876                 return nfserr_resource;
4877         p = xdr_encode_hyper(p, os->count);
4878         *p++ = cpu_to_be32(0);
4879         return nfserr;
4880 }
4881
4882 static __be32
4883 nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
4884                             struct nfsd4_read *read)
4885 {
4886         bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags);
4887         struct file *file = read->rd_nf->nf_file;
4888         struct xdr_stream *xdr = resp->xdr;
4889         unsigned long maxcount;
4890         __be32 nfserr, *p;
4891
4892         /* Content type, offset, byte count */
4893         p = xdr_reserve_space(xdr, 4 + 8 + 4);
4894         if (!p)
4895                 return nfserr_io;
4896         if (resp->xdr->buf->page_len && splice_ok) {
4897                 WARN_ON_ONCE(splice_ok);
4898                 return nfserr_serverfault;
4899         }
4900
4901         maxcount = min_t(unsigned long, read->rd_length,
4902                          (xdr->buf->buflen - xdr->buf->len));
4903
4904         if (file->f_op->splice_read && splice_ok)
4905                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4906         else
4907                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
4908         if (nfserr)
4909                 return nfserr;
4910
4911         *p++ = cpu_to_be32(NFS4_CONTENT_DATA);
4912         p = xdr_encode_hyper(p, read->rd_offset);
4913         *p = cpu_to_be32(read->rd_length);
4914
4915         return nfs_ok;
4916 }
4917
4918 static __be32
4919 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
4920                        union nfsd4_op_u *u)
4921 {
4922         struct nfsd4_read *read = &u->read;
4923         struct file *file = read->rd_nf->nf_file;
4924         struct xdr_stream *xdr = resp->xdr;
4925         int starting_len = xdr->buf->len;
4926         u32 segments = 0;
4927         __be32 *p;
4928
4929         if (nfserr)
4930                 return nfserr;
4931
4932         /* eof flag, segment count */
4933         p = xdr_reserve_space(xdr, 4 + 4);
4934         if (!p)
4935                 return nfserr_io;
4936         xdr_commit_encode(xdr);
4937
4938         read->rd_eof = read->rd_offset >= i_size_read(file_inode(file));
4939         if (read->rd_eof)
4940                 goto out;
4941
4942         nfserr = nfsd4_encode_read_plus_data(resp, read);
4943         if (nfserr) {
4944                 xdr_truncate_encode(xdr, starting_len);
4945                 return nfserr;
4946         }
4947
4948         segments++;
4949
4950 out:
4951         p = xdr_encode_bool(p, read->rd_eof);
4952         *p = cpu_to_be32(segments);
4953         return nfserr;
4954 }
4955
4956 static __be32
4957 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
4958                          union nfsd4_op_u *u)
4959 {
4960         struct nfsd4_copy_notify *cn = &u->copy_notify;
4961         struct xdr_stream *xdr = resp->xdr;
4962         __be32 *p;
4963
4964         if (nfserr)
4965                 return nfserr;
4966
4967         /* 8 sec, 4 nsec */
4968         p = xdr_reserve_space(xdr, 12);
4969         if (!p)
4970                 return nfserr_resource;
4971
4972         /* cnr_lease_time */
4973         p = xdr_encode_hyper(p, cn->cpn_sec);
4974         *p++ = cpu_to_be32(cn->cpn_nsec);
4975
4976         /* cnr_stateid */
4977         nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid);
4978         if (nfserr)
4979                 return nfserr;
4980
4981         /* cnr_src.nl_nsvr */
4982         p = xdr_reserve_space(xdr, 4);
4983         if (!p)
4984                 return nfserr_resource;
4985
4986         *p++ = cpu_to_be32(1);
4987
4988         nfserr = nfsd42_encode_nl4_server(resp, cn->cpn_src);
4989         return nfserr;
4990 }
4991
4992 static __be32
4993 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4994                   union nfsd4_op_u *u)
4995 {
4996         struct nfsd4_seek *seek = &u->seek;
4997         __be32 *p;
4998
4999         p = xdr_reserve_space(resp->xdr, 4 + 8);
5000         *p++ = cpu_to_be32(seek->seek_eof);
5001         p = xdr_encode_hyper(p, seek->seek_pos);
5002
5003         return 0;
5004 }
5005
5006 static __be32
5007 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr,
5008                   union nfsd4_op_u *p)
5009 {
5010         return nfserr;
5011 }
5012
5013 /*
5014  * Encode kmalloc-ed buffer in to XDR stream.
5015  */
5016 static __be32
5017 nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
5018 {
5019         u32 cplen;
5020         __be32 *p;
5021
5022         cplen = min_t(unsigned long, buflen,
5023                       ((void *)xdr->end - (void *)xdr->p));
5024         p = xdr_reserve_space(xdr, cplen);
5025         if (!p)
5026                 return nfserr_resource;
5027
5028         memcpy(p, buf, cplen);
5029         buf += cplen;
5030         buflen -= cplen;
5031
5032         while (buflen) {
5033                 cplen = min_t(u32, buflen, PAGE_SIZE);
5034                 p = xdr_reserve_space(xdr, cplen);
5035                 if (!p)
5036                         return nfserr_resource;
5037
5038                 memcpy(p, buf, cplen);
5039
5040                 if (cplen < PAGE_SIZE) {
5041                         /*
5042                          * We're done, with a length that wasn't page
5043                          * aligned, so possibly not word aligned. Pad
5044                          * any trailing bytes with 0.
5045                          */
5046                         xdr_encode_opaque_fixed(p, NULL, cplen);
5047                         break;
5048                 }
5049
5050                 buflen -= PAGE_SIZE;
5051                 buf += PAGE_SIZE;
5052         }
5053
5054         return 0;
5055 }
5056
5057 static __be32
5058 nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5059                       union nfsd4_op_u *u)
5060 {
5061         struct nfsd4_getxattr *getxattr = &u->getxattr;
5062         struct xdr_stream *xdr = resp->xdr;
5063         __be32 *p, err;
5064
5065         p = xdr_reserve_space(xdr, 4);
5066         if (!p)
5067                 return nfserr_resource;
5068
5069         *p = cpu_to_be32(getxattr->getxa_len);
5070
5071         if (getxattr->getxa_len == 0)
5072                 return 0;
5073
5074         err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf,
5075                                     getxattr->getxa_len);
5076
5077         kvfree(getxattr->getxa_buf);
5078
5079         return err;
5080 }
5081
5082 static __be32
5083 nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5084                       union nfsd4_op_u *u)
5085 {
5086         struct nfsd4_setxattr *setxattr = &u->setxattr;
5087         struct xdr_stream *xdr = resp->xdr;
5088         __be32 *p;
5089
5090         p = xdr_reserve_space(xdr, 20);
5091         if (!p)
5092                 return nfserr_resource;
5093
5094         encode_cinfo(p, &setxattr->setxa_cinfo);
5095
5096         return 0;
5097 }
5098
5099 /*
5100  * See if there are cookie values that can be rejected outright.
5101  */
5102 static __be32
5103 nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
5104                                 u32 *offsetp)
5105 {
5106         u64 cookie = listxattrs->lsxa_cookie;
5107
5108         /*
5109          * If the cookie is larger than the maximum number we can fit
5110          * in either the buffer we just got back from vfs_listxattr, or,
5111          * XDR-encoded, in the return buffer, it's invalid.
5112          */
5113         if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
5114                 return nfserr_badcookie;
5115
5116         if (cookie > (listxattrs->lsxa_maxcount /
5117                       (XDR_QUADLEN(XATTR_USER_PREFIX_LEN + 2) + 4)))
5118                 return nfserr_badcookie;
5119
5120         *offsetp = (u32)cookie;
5121         return 0;
5122 }
5123
5124 static __be32
5125 nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
5126                         union nfsd4_op_u *u)
5127 {
5128         struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
5129         struct xdr_stream *xdr = resp->xdr;
5130         u32 cookie_offset, count_offset, eof;
5131         u32 left, xdrleft, slen, count;
5132         u32 xdrlen, offset;
5133         u64 cookie;
5134         char *sp;
5135         __be32 status, tmp;
5136         __be32 *p;
5137         u32 nuser;
5138
5139         eof = 1;
5140
5141         status = nfsd4_listxattr_validate_cookie(listxattrs, &offset);
5142         if (status)
5143                 goto out;
5144
5145         /*
5146          * Reserve space for the cookie and the name array count. Record
5147          * the offsets to save them later.
5148          */
5149         cookie_offset = xdr->buf->len;
5150         count_offset = cookie_offset + 8;
5151         p = xdr_reserve_space(xdr, 12);
5152         if (!p) {
5153                 status = nfserr_resource;
5154                 goto out;
5155         }
5156
5157         count = 0;
5158         left = listxattrs->lsxa_len;
5159         sp = listxattrs->lsxa_buf;
5160         nuser = 0;
5161
5162         xdrleft = listxattrs->lsxa_maxcount;
5163
5164         while (left > 0 && xdrleft > 0) {
5165                 slen = strlen(sp);
5166
5167                 /*
5168                  * Check if this is a "user." attribute, skip it if not.
5169                  */
5170                 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
5171                         goto contloop;
5172
5173                 slen -= XATTR_USER_PREFIX_LEN;
5174                 xdrlen = 4 + ((slen + 3) & ~3);
5175                 if (xdrlen > xdrleft) {
5176                         if (count == 0) {
5177                                 /*
5178                                  * Can't even fit the first attribute name.
5179                                  */
5180                                 status = nfserr_toosmall;
5181                                 goto out;
5182                         }
5183                         eof = 0;
5184                         goto wreof;
5185                 }
5186
5187                 left -= XATTR_USER_PREFIX_LEN;
5188                 sp += XATTR_USER_PREFIX_LEN;
5189                 if (nuser++ < offset)
5190                         goto contloop;
5191
5192
5193                 p = xdr_reserve_space(xdr, xdrlen);
5194                 if (!p) {
5195                         status = nfserr_resource;
5196                         goto out;
5197                 }
5198
5199                 xdr_encode_opaque(p, sp, slen);
5200
5201                 xdrleft -= xdrlen;
5202                 count++;
5203 contloop:
5204                 sp += slen + 1;
5205                 left -= slen + 1;
5206         }
5207
5208         /*
5209          * If there were user attributes to copy, but we didn't copy
5210          * any, the offset was too large (e.g. the cookie was invalid).
5211          */
5212         if (nuser > 0 && count == 0) {
5213                 status = nfserr_badcookie;
5214                 goto out;
5215         }
5216
5217 wreof:
5218         p = xdr_reserve_space(xdr, 4);
5219         if (!p) {
5220                 status = nfserr_resource;
5221                 goto out;
5222         }
5223         *p = cpu_to_be32(eof);
5224
5225         cookie = offset + count;
5226
5227         write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &cookie, 8);
5228         tmp = cpu_to_be32(count);
5229         write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4);
5230 out:
5231         if (listxattrs->lsxa_len)
5232                 kvfree(listxattrs->lsxa_buf);
5233         return status;
5234 }
5235
5236 static __be32
5237 nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5238                          union nfsd4_op_u *u)
5239 {
5240         struct nfsd4_removexattr *removexattr = &u->removexattr;
5241         struct xdr_stream *xdr = resp->xdr;
5242         __be32 *p;
5243
5244         p = xdr_reserve_space(xdr, 20);
5245         if (!p)
5246                 return nfserr_resource;
5247
5248         p = encode_cinfo(p, &removexattr->rmxa_cinfo);
5249         return 0;
5250 }
5251
5252 typedef __be32(*nfsd4_enc)(struct nfsd4_compoundres *, __be32, union nfsd4_op_u *u);
5253
5254 /*
5255  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
5256  * since we don't need to filter out obsolete ops as this is
5257  * done in the decoding phase.
5258  */
5259 static const nfsd4_enc nfsd4_enc_ops[] = {
5260         [OP_ACCESS]             = nfsd4_encode_access,
5261         [OP_CLOSE]              = nfsd4_encode_close,
5262         [OP_COMMIT]             = nfsd4_encode_commit,
5263         [OP_CREATE]             = nfsd4_encode_create,
5264         [OP_DELEGPURGE]         = nfsd4_encode_noop,
5265         [OP_DELEGRETURN]        = nfsd4_encode_noop,
5266         [OP_GETATTR]            = nfsd4_encode_getattr,
5267         [OP_GETFH]              = nfsd4_encode_getfh,
5268         [OP_LINK]               = nfsd4_encode_link,
5269         [OP_LOCK]               = nfsd4_encode_lock,
5270         [OP_LOCKT]              = nfsd4_encode_lockt,
5271         [OP_LOCKU]              = nfsd4_encode_locku,
5272         [OP_LOOKUP]             = nfsd4_encode_noop,
5273         [OP_LOOKUPP]            = nfsd4_encode_noop,
5274         [OP_NVERIFY]            = nfsd4_encode_noop,
5275         [OP_OPEN]               = nfsd4_encode_open,
5276         [OP_OPENATTR]           = nfsd4_encode_noop,
5277         [OP_OPEN_CONFIRM]       = nfsd4_encode_open_confirm,
5278         [OP_OPEN_DOWNGRADE]     = nfsd4_encode_open_downgrade,
5279         [OP_PUTFH]              = nfsd4_encode_noop,
5280         [OP_PUTPUBFH]           = nfsd4_encode_noop,
5281         [OP_PUTROOTFH]          = nfsd4_encode_noop,
5282         [OP_READ]               = nfsd4_encode_read,
5283         [OP_READDIR]            = nfsd4_encode_readdir,
5284         [OP_READLINK]           = nfsd4_encode_readlink,
5285         [OP_REMOVE]             = nfsd4_encode_remove,
5286         [OP_RENAME]             = nfsd4_encode_rename,
5287         [OP_RENEW]              = nfsd4_encode_noop,
5288         [OP_RESTOREFH]          = nfsd4_encode_noop,
5289         [OP_SAVEFH]             = nfsd4_encode_noop,
5290         [OP_SECINFO]            = nfsd4_encode_secinfo,
5291         [OP_SETATTR]            = nfsd4_encode_setattr,
5292         [OP_SETCLIENTID]        = nfsd4_encode_setclientid,
5293         [OP_SETCLIENTID_CONFIRM] = nfsd4_encode_noop,
5294         [OP_VERIFY]             = nfsd4_encode_noop,
5295         [OP_WRITE]              = nfsd4_encode_write,
5296         [OP_RELEASE_LOCKOWNER]  = nfsd4_encode_noop,
5297
5298         /* NFSv4.1 operations */
5299         [OP_BACKCHANNEL_CTL]    = nfsd4_encode_noop,
5300         [OP_BIND_CONN_TO_SESSION] = nfsd4_encode_bind_conn_to_session,
5301         [OP_EXCHANGE_ID]        = nfsd4_encode_exchange_id,
5302         [OP_CREATE_SESSION]     = nfsd4_encode_create_session,
5303         [OP_DESTROY_SESSION]    = nfsd4_encode_noop,
5304         [OP_FREE_STATEID]       = nfsd4_encode_noop,
5305         [OP_GET_DIR_DELEGATION] = nfsd4_encode_noop,
5306 #ifdef CONFIG_NFSD_PNFS
5307         [OP_GETDEVICEINFO]      = nfsd4_encode_getdeviceinfo,
5308         [OP_GETDEVICELIST]      = nfsd4_encode_noop,
5309         [OP_LAYOUTCOMMIT]       = nfsd4_encode_layoutcommit,
5310         [OP_LAYOUTGET]          = nfsd4_encode_layoutget,
5311         [OP_LAYOUTRETURN]       = nfsd4_encode_layoutreturn,
5312 #else
5313         [OP_GETDEVICEINFO]      = nfsd4_encode_noop,
5314         [OP_GETDEVICELIST]      = nfsd4_encode_noop,
5315         [OP_LAYOUTCOMMIT]       = nfsd4_encode_noop,
5316         [OP_LAYOUTGET]          = nfsd4_encode_noop,
5317         [OP_LAYOUTRETURN]       = nfsd4_encode_noop,
5318 #endif
5319         [OP_SECINFO_NO_NAME]    = nfsd4_encode_secinfo_no_name,
5320         [OP_SEQUENCE]           = nfsd4_encode_sequence,
5321         [OP_SET_SSV]            = nfsd4_encode_noop,
5322         [OP_TEST_STATEID]       = nfsd4_encode_test_stateid,
5323         [OP_WANT_DELEGATION]    = nfsd4_encode_noop,
5324         [OP_DESTROY_CLIENTID]   = nfsd4_encode_noop,
5325         [OP_RECLAIM_COMPLETE]   = nfsd4_encode_noop,
5326
5327         /* NFSv4.2 operations */
5328         [OP_ALLOCATE]           = nfsd4_encode_noop,
5329         [OP_COPY]               = nfsd4_encode_copy,
5330         [OP_COPY_NOTIFY]        = nfsd4_encode_copy_notify,
5331         [OP_DEALLOCATE]         = nfsd4_encode_noop,
5332         [OP_IO_ADVISE]          = nfsd4_encode_noop,
5333         [OP_LAYOUTERROR]        = nfsd4_encode_noop,
5334         [OP_LAYOUTSTATS]        = nfsd4_encode_noop,
5335         [OP_OFFLOAD_CANCEL]     = nfsd4_encode_noop,
5336         [OP_OFFLOAD_STATUS]     = nfsd4_encode_offload_status,
5337         [OP_READ_PLUS]          = nfsd4_encode_read_plus,
5338         [OP_SEEK]               = nfsd4_encode_seek,
5339         [OP_WRITE_SAME]         = nfsd4_encode_noop,
5340         [OP_CLONE]              = nfsd4_encode_noop,
5341
5342         /* RFC 8276 extended atributes operations */
5343         [OP_GETXATTR]           = nfsd4_encode_getxattr,
5344         [OP_SETXATTR]           = nfsd4_encode_setxattr,
5345         [OP_LISTXATTRS]         = nfsd4_encode_listxattrs,
5346         [OP_REMOVEXATTR]        = nfsd4_encode_removexattr,
5347 };
5348
5349 /*
5350  * Calculate whether we still have space to encode repsize bytes.
5351  * There are two considerations:
5352  *     - For NFS versions >=4.1, the size of the reply must stay within
5353  *       session limits
5354  *     - For all NFS versions, we must stay within limited preallocated
5355  *       buffer space.
5356  *
5357  * This is called before the operation is processed, so can only provide
5358  * an upper estimate.  For some nonidempotent operations (such as
5359  * getattr), it's not necessarily a problem if that estimate is wrong,
5360  * as we can fail it after processing without significant side effects.
5361  */
5362 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
5363 {
5364         struct xdr_buf *buf = &resp->rqstp->rq_res;
5365         struct nfsd4_slot *slot = resp->cstate.slot;
5366
5367         if (buf->len + respsize <= buf->buflen)
5368                 return nfs_ok;
5369         if (!nfsd4_has_session(&resp->cstate))
5370                 return nfserr_resource;
5371         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
5372                 WARN_ON_ONCE(1);
5373                 return nfserr_rep_too_big_to_cache;
5374         }
5375         return nfserr_rep_too_big;
5376 }
5377
5378 void
5379 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
5380 {
5381         struct xdr_stream *xdr = resp->xdr;
5382         struct nfs4_stateowner *so = resp->cstate.replay_owner;
5383         struct svc_rqst *rqstp = resp->rqstp;
5384         const struct nfsd4_operation *opdesc = op->opdesc;
5385         int post_err_offset;
5386         nfsd4_enc encoder;
5387         __be32 *p;
5388
5389         p = xdr_reserve_space(xdr, 8);
5390         if (!p) {
5391                 WARN_ON_ONCE(1);
5392                 return;
5393         }
5394         *p++ = cpu_to_be32(op->opnum);
5395         post_err_offset = xdr->buf->len;
5396
5397         if (op->opnum == OP_ILLEGAL)
5398                 goto status;
5399         if (op->status && opdesc &&
5400                         !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
5401                 goto status;
5402         BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
5403                !nfsd4_enc_ops[op->opnum]);
5404         encoder = nfsd4_enc_ops[op->opnum];
5405         op->status = encoder(resp, op->status, &op->u);
5406         if (op->status)
5407                 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status);
5408         if (opdesc && opdesc->op_release)
5409                 opdesc->op_release(&op->u);
5410         xdr_commit_encode(xdr);
5411
5412         /* nfsd4_check_resp_size guarantees enough room for error status */
5413         if (!op->status) {
5414                 int space_needed = 0;
5415                 if (!nfsd4_last_compound_op(rqstp))
5416                         space_needed = COMPOUND_ERR_SLACK_SPACE;
5417                 op->status = nfsd4_check_resp_size(resp, space_needed);
5418         }
5419         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
5420                 struct nfsd4_slot *slot = resp->cstate.slot;
5421
5422                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
5423                         op->status = nfserr_rep_too_big_to_cache;
5424                 else
5425                         op->status = nfserr_rep_too_big;
5426         }
5427         if (op->status == nfserr_resource ||
5428             op->status == nfserr_rep_too_big ||
5429             op->status == nfserr_rep_too_big_to_cache) {
5430                 /*
5431                  * The operation may have already been encoded or
5432                  * partially encoded.  No op returns anything additional
5433                  * in the case of one of these three errors, so we can
5434                  * just truncate back to after the status.  But it's a
5435                  * bug if we had to do this on a non-idempotent op:
5436                  */
5437                 warn_on_nonidempotent_op(op);
5438                 xdr_truncate_encode(xdr, post_err_offset);
5439         }
5440         if (so) {
5441                 int len = xdr->buf->len - post_err_offset;
5442
5443                 so->so_replay.rp_status = op->status;
5444                 so->so_replay.rp_buflen = len;
5445                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
5446                                                 so->so_replay.rp_buf, len);
5447         }
5448 status:
5449         *p = op->status;
5450 }
5451
5452 /*
5453  * Encode the reply stored in the stateowner reply cache
5454  *
5455  * XDR note: do not encode rp->rp_buflen: the buffer contains the
5456  * previously sent already encoded operation.
5457  */
5458 void
5459 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
5460 {
5461         __be32 *p;
5462         struct nfs4_replay *rp = op->replay;
5463
5464         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
5465         if (!p) {
5466                 WARN_ON_ONCE(1);
5467                 return;
5468         }
5469         *p++ = cpu_to_be32(op->opnum);
5470         *p++ = rp->rp_status;  /* already xdr'ed */
5471
5472         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
5473 }
5474
5475 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
5476 {
5477         struct nfsd4_compoundargs *args = rqstp->rq_argp;
5478
5479         if (args->ops != args->iops) {
5480                 vfree(args->ops);
5481                 args->ops = args->iops;
5482         }
5483         while (args->to_free) {
5484                 struct svcxdr_tmpbuf *tb = args->to_free;
5485                 args->to_free = tb->next;
5486                 kfree(tb);
5487         }
5488 }
5489
5490 bool
5491 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5492 {
5493         struct nfsd4_compoundargs *args = rqstp->rq_argp;
5494
5495         /* svcxdr_tmp_alloc */
5496         args->to_free = NULL;
5497
5498         args->xdr = xdr;
5499         args->ops = args->iops;
5500         args->rqstp = rqstp;
5501
5502         return nfsd4_decode_compound(args);
5503 }
5504
5505 bool
5506 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5507 {
5508         struct nfsd4_compoundres *resp = rqstp->rq_resp;
5509         __be32 *p;
5510
5511         /*
5512          * Send buffer space for the following items is reserved
5513          * at the top of nfsd4_proc_compound().
5514          */
5515         p = resp->statusp;
5516
5517         *p++ = resp->cstate.status;
5518
5519         rqstp->rq_next_page = xdr->page_ptr + 1;
5520
5521         *p++ = htonl(resp->taglen);
5522         memcpy(p, resp->tag, resp->taglen);
5523         p += XDR_QUADLEN(resp->taglen);
5524         *p++ = htonl(resp->opcnt);
5525
5526         nfsd4_sequence_done(resp);
5527         return true;
5528 }