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                 op->opdesc = NULL;
2480
2481                 if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0)
2482                         return false;
2483                 if (nfsd4_opnum_in_range(argp, op)) {
2484                         op->opdesc = OPDESC(op);
2485                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
2486                         if (op->status != nfs_ok)
2487                                 trace_nfsd_compound_decode_err(argp->rqstp,
2488                                                                argp->opcnt, i,
2489                                                                op->opnum,
2490                                                                op->status);
2491                 } else {
2492                         op->opnum = OP_ILLEGAL;
2493                         op->status = nfserr_op_illegal;
2494                 }
2495
2496                 /*
2497                  * We'll try to cache the result in the DRC if any one
2498                  * op in the compound wants to be cached:
2499                  */
2500                 cachethis |= nfsd4_cache_this_op(op);
2501
2502                 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) {
2503                         readcount++;
2504                         readbytes += nfsd4_max_reply(argp->rqstp, op);
2505                 } else
2506                         max_reply += nfsd4_max_reply(argp->rqstp, op);
2507                 /*
2508                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
2509                  * (Special case because it will just skip encoding this
2510                  * if it runs out of xdr buffer space, and it is the only
2511                  * operation that behaves this way.)
2512                  */
2513                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
2514                         max_reply += NFS4_OPAQUE_LIMIT;
2515
2516                 if (op->status) {
2517                         argp->opcnt = i+1;
2518                         break;
2519                 }
2520         }
2521         /* Sessions make the DRC unnecessary: */
2522         if (argp->minorversion)
2523                 cachethis = false;
2524         svc_reserve(argp->rqstp, max_reply + readbytes);
2525         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
2526
2527         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
2528                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
2529
2530         return true;
2531 }
2532
2533 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
2534                              struct svc_export *exp)
2535 {
2536         if (exp->ex_flags & NFSEXP_V4ROOT) {
2537                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
2538                 *p++ = 0;
2539         } else
2540                 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2541         return p;
2542 }
2543
2544 /*
2545  * ctime (in NFSv4, time_metadata) is not writeable, and the client
2546  * doesn't really care what resolution could theoretically be stored by
2547  * the filesystem.
2548  *
2549  * The client cares how close together changes can be while still
2550  * guaranteeing ctime changes.  For most filesystems (which have
2551  * timestamps with nanosecond fields) that is limited by the resolution
2552  * of the time returned from current_time() (which I'm assuming to be
2553  * 1/HZ).
2554  */
2555 static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2556 {
2557         struct timespec64 ts;
2558         u32 ns;
2559
2560         ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2561         ts = ns_to_timespec64(ns);
2562
2563         p = xdr_encode_hyper(p, ts.tv_sec);
2564         *p++ = cpu_to_be32(ts.tv_nsec);
2565
2566         return p;
2567 }
2568
2569 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2570 {
2571         *p++ = cpu_to_be32(c->atomic);
2572         p = xdr_encode_hyper(p, c->before_change);
2573         p = xdr_encode_hyper(p, c->after_change);
2574         return p;
2575 }
2576
2577 /* Encode as an array of strings the string given with components
2578  * separated @sep, escaped with esc_enter and esc_exit.
2579  */
2580 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2581                                           char *components, char esc_enter,
2582                                           char esc_exit)
2583 {
2584         __be32 *p;
2585         __be32 pathlen;
2586         int pathlen_offset;
2587         int strlen, count=0;
2588         char *str, *end, *next;
2589
2590         dprintk("nfsd4_encode_components(%s)\n", components);
2591
2592         pathlen_offset = xdr->buf->len;
2593         p = xdr_reserve_space(xdr, 4);
2594         if (!p)
2595                 return nfserr_resource;
2596         p++; /* We will fill this in with @count later */
2597
2598         end = str = components;
2599         while (*end) {
2600                 bool found_esc = false;
2601
2602                 /* try to parse as esc_start, ..., esc_end, sep */
2603                 if (*str == esc_enter) {
2604                         for (; *end && (*end != esc_exit); end++)
2605                                 /* find esc_exit or end of string */;
2606                         next = end + 1;
2607                         if (*end && (!*next || *next == sep)) {
2608                                 str++;
2609                                 found_esc = true;
2610                         }
2611                 }
2612
2613                 if (!found_esc)
2614                         for (; *end && (*end != sep); end++)
2615                                 /* find sep or end of string */;
2616
2617                 strlen = end - str;
2618                 if (strlen) {
2619                         p = xdr_reserve_space(xdr, strlen + 4);
2620                         if (!p)
2621                                 return nfserr_resource;
2622                         p = xdr_encode_opaque(p, str, strlen);
2623                         count++;
2624                 }
2625                 else
2626                         end++;
2627                 if (found_esc)
2628                         end = next;
2629
2630                 str = end;
2631         }
2632         pathlen = htonl(count);
2633         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2634         return 0;
2635 }
2636
2637 /* Encode as an array of strings the string given with components
2638  * separated @sep.
2639  */
2640 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2641                                       char *components)
2642 {
2643         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2644 }
2645
2646 /*
2647  * encode a location element of a fs_locations structure
2648  */
2649 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2650                                         struct nfsd4_fs_location *location)
2651 {
2652         __be32 status;
2653
2654         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2655                                                 '[', ']');
2656         if (status)
2657                 return status;
2658         status = nfsd4_encode_components(xdr, '/', location->path);
2659         if (status)
2660                 return status;
2661         return 0;
2662 }
2663
2664 /*
2665  * Encode a path in RFC3530 'pathname4' format
2666  */
2667 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2668                                 const struct path *root,
2669                                 const struct path *path)
2670 {
2671         struct path cur = *path;
2672         __be32 *p;
2673         struct dentry **components = NULL;
2674         unsigned int ncomponents = 0;
2675         __be32 err = nfserr_jukebox;
2676
2677         dprintk("nfsd4_encode_components(");
2678
2679         path_get(&cur);
2680         /* First walk the path up to the nfsd root, and store the
2681          * dentries/path components in an array.
2682          */
2683         for (;;) {
2684                 if (path_equal(&cur, root))
2685                         break;
2686                 if (cur.dentry == cur.mnt->mnt_root) {
2687                         if (follow_up(&cur))
2688                                 continue;
2689                         goto out_free;
2690                 }
2691                 if ((ncomponents & 15) == 0) {
2692                         struct dentry **new;
2693                         new = krealloc(components,
2694                                         sizeof(*new) * (ncomponents + 16),
2695                                         GFP_KERNEL);
2696                         if (!new)
2697                                 goto out_free;
2698                         components = new;
2699                 }
2700                 components[ncomponents++] = cur.dentry;
2701                 cur.dentry = dget_parent(cur.dentry);
2702         }
2703         err = nfserr_resource;
2704         p = xdr_reserve_space(xdr, 4);
2705         if (!p)
2706                 goto out_free;
2707         *p++ = cpu_to_be32(ncomponents);
2708
2709         while (ncomponents) {
2710                 struct dentry *dentry = components[ncomponents - 1];
2711                 unsigned int len;
2712
2713                 spin_lock(&dentry->d_lock);
2714                 len = dentry->d_name.len;
2715                 p = xdr_reserve_space(xdr, len + 4);
2716                 if (!p) {
2717                         spin_unlock(&dentry->d_lock);
2718                         goto out_free;
2719                 }
2720                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2721                 dprintk("/%pd", dentry);
2722                 spin_unlock(&dentry->d_lock);
2723                 dput(dentry);
2724                 ncomponents--;
2725         }
2726
2727         err = 0;
2728 out_free:
2729         dprintk(")\n");
2730         while (ncomponents)
2731                 dput(components[--ncomponents]);
2732         kfree(components);
2733         path_put(&cur);
2734         return err;
2735 }
2736
2737 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2738                         struct svc_rqst *rqstp, const struct path *path)
2739 {
2740         struct svc_export *exp_ps;
2741         __be32 res;
2742
2743         exp_ps = rqst_find_fsidzero_export(rqstp);
2744         if (IS_ERR(exp_ps))
2745                 return nfserrno(PTR_ERR(exp_ps));
2746         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2747         exp_put(exp_ps);
2748         return res;
2749 }
2750
2751 /*
2752  *  encode a fs_locations structure
2753  */
2754 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2755                         struct svc_rqst *rqstp, struct svc_export *exp)
2756 {
2757         __be32 status;
2758         int i;
2759         __be32 *p;
2760         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2761
2762         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2763         if (status)
2764                 return status;
2765         p = xdr_reserve_space(xdr, 4);
2766         if (!p)
2767                 return nfserr_resource;
2768         *p++ = cpu_to_be32(fslocs->locations_count);
2769         for (i=0; i<fslocs->locations_count; i++) {
2770                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2771                 if (status)
2772                         return status;
2773         }
2774         return 0;
2775 }
2776
2777 static u32 nfs4_file_type(umode_t mode)
2778 {
2779         switch (mode & S_IFMT) {
2780         case S_IFIFO:   return NF4FIFO;
2781         case S_IFCHR:   return NF4CHR;
2782         case S_IFDIR:   return NF4DIR;
2783         case S_IFBLK:   return NF4BLK;
2784         case S_IFLNK:   return NF4LNK;
2785         case S_IFREG:   return NF4REG;
2786         case S_IFSOCK:  return NF4SOCK;
2787         default:        return NF4BAD;
2788         }
2789 }
2790
2791 static inline __be32
2792 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2793                      struct nfs4_ace *ace)
2794 {
2795         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2796                 return nfs4_acl_write_who(xdr, ace->whotype);
2797         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2798                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2799         else
2800                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2801 }
2802
2803 static inline __be32
2804 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2805 {
2806         __be32          *p;
2807         unsigned long   i = hweight_long(layout_types);
2808
2809         p = xdr_reserve_space(xdr, 4 + 4 * i);
2810         if (!p)
2811                 return nfserr_resource;
2812
2813         *p++ = cpu_to_be32(i);
2814
2815         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2816                 if (layout_types & (1 << i))
2817                         *p++ = cpu_to_be32(i);
2818
2819         return 0;
2820 }
2821
2822 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2823                               FATTR4_WORD0_RDATTR_ERROR)
2824 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2825 #define WORD2_ABSENT_FS_ATTRS 0
2826
2827 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2828 static inline __be32
2829 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2830                             void *context, int len)
2831 {
2832         __be32 *p;
2833
2834         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2835         if (!p)
2836                 return nfserr_resource;
2837
2838         /*
2839          * For now we use a 0 here to indicate the null translation; in
2840          * the future we may place a call to translation code here.
2841          */
2842         *p++ = cpu_to_be32(0); /* lfs */
2843         *p++ = cpu_to_be32(0); /* pi */
2844         p = xdr_encode_opaque(p, context, len);
2845         return 0;
2846 }
2847 #else
2848 static inline __be32
2849 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2850                             void *context, int len)
2851 { return 0; }
2852 #endif
2853
2854 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2855 {
2856         /* As per referral draft:  */
2857         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2858             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2859                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2860                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2861                         *rdattr_err = NFSERR_MOVED;
2862                 else
2863                         return nfserr_moved;
2864         }
2865         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2866         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2867         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2868         return 0;
2869 }
2870
2871
2872 static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino)
2873 {
2874         struct path path = exp->ex_path;
2875         struct kstat stat;
2876         int err;
2877
2878         path_get(&path);
2879         while (follow_up(&path)) {
2880                 if (path.dentry != path.mnt->mnt_root)
2881                         break;
2882         }
2883         err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT);
2884         path_put(&path);
2885         if (!err)
2886                 *pino = stat.ino;
2887         return err;
2888 }
2889
2890 static __be32
2891 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2892 {
2893         __be32 *p;
2894
2895         if (bmval2) {
2896                 p = xdr_reserve_space(xdr, 16);
2897                 if (!p)
2898                         goto out_resource;
2899                 *p++ = cpu_to_be32(3);
2900                 *p++ = cpu_to_be32(bmval0);
2901                 *p++ = cpu_to_be32(bmval1);
2902                 *p++ = cpu_to_be32(bmval2);
2903         } else if (bmval1) {
2904                 p = xdr_reserve_space(xdr, 12);
2905                 if (!p)
2906                         goto out_resource;
2907                 *p++ = cpu_to_be32(2);
2908                 *p++ = cpu_to_be32(bmval0);
2909                 *p++ = cpu_to_be32(bmval1);
2910         } else {
2911                 p = xdr_reserve_space(xdr, 8);
2912                 if (!p)
2913                         goto out_resource;
2914                 *p++ = cpu_to_be32(1);
2915                 *p++ = cpu_to_be32(bmval0);
2916         }
2917
2918         return 0;
2919 out_resource:
2920         return nfserr_resource;
2921 }
2922
2923 /*
2924  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2925  * ourselves.
2926  */
2927 static __be32
2928 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2929                 struct svc_export *exp,
2930                 struct dentry *dentry, u32 *bmval,
2931                 struct svc_rqst *rqstp, int ignore_crossmnt)
2932 {
2933         u32 bmval0 = bmval[0];
2934         u32 bmval1 = bmval[1];
2935         u32 bmval2 = bmval[2];
2936         struct kstat stat;
2937         struct svc_fh *tempfh = NULL;
2938         struct kstatfs statfs;
2939         __be32 *p, *attrlen_p;
2940         int starting_len = xdr->buf->len;
2941         int attrlen_offset;
2942         u32 dummy;
2943         u64 dummy64;
2944         u32 rdattr_err = 0;
2945         __be32 status;
2946         int err;
2947         struct nfs4_acl *acl = NULL;
2948 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2949         void *context = NULL;
2950         int contextlen;
2951 #endif
2952         bool contextsupport = false;
2953         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2954         u32 minorversion = resp->cstate.minorversion;
2955         struct path path = {
2956                 .mnt    = exp->ex_path.mnt,
2957                 .dentry = dentry,
2958         };
2959         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2960
2961         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2962         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2963
2964         if (exp->ex_fslocs.migrated) {
2965                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2966                 if (status)
2967                         goto out;
2968         }
2969
2970         err = vfs_getattr(&path, &stat,
2971                           STATX_BASIC_STATS | STATX_BTIME | STATX_CHANGE_COOKIE,
2972                           AT_STATX_SYNC_AS_STAT);
2973         if (err)
2974                 goto out_nfserr;
2975         if (!(stat.result_mask & STATX_BTIME))
2976                 /* underlying FS does not offer btime so we can't share it */
2977                 bmval1 &= ~FATTR4_WORD1_TIME_CREATE;
2978         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2979                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2980             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2981                        FATTR4_WORD1_SPACE_TOTAL))) {
2982                 err = vfs_statfs(&path, &statfs);
2983                 if (err)
2984                         goto out_nfserr;
2985         }
2986         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2987                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2988                 status = nfserr_jukebox;
2989                 if (!tempfh)
2990                         goto out;
2991                 fh_init(tempfh, NFS4_FHSIZE);
2992                 status = fh_compose(tempfh, exp, dentry, NULL);
2993                 if (status)
2994                         goto out;
2995                 fhp = tempfh;
2996         }
2997         if (bmval0 & FATTR4_WORD0_ACL) {
2998                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2999                 if (err == -EOPNOTSUPP)
3000                         bmval0 &= ~FATTR4_WORD0_ACL;
3001                 else if (err == -EINVAL) {
3002                         status = nfserr_attrnotsupp;
3003                         goto out;
3004                 } else if (err != 0)
3005                         goto out_nfserr;
3006         }
3007
3008 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3009         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
3010              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
3011                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
3012                         err = security_inode_getsecctx(d_inode(dentry),
3013                                                 &context, &contextlen);
3014                 else
3015                         err = -EOPNOTSUPP;
3016                 contextsupport = (err == 0);
3017                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
3018                         if (err == -EOPNOTSUPP)
3019                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
3020                         else if (err)
3021                                 goto out_nfserr;
3022                 }
3023         }
3024 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3025
3026         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
3027         if (status)
3028                 goto out;
3029
3030         attrlen_offset = xdr->buf->len;
3031         attrlen_p = xdr_reserve_space(xdr, XDR_UNIT);
3032         if (!attrlen_p)
3033                 goto out_resource;
3034
3035         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
3036                 u32 supp[3];
3037
3038                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
3039
3040                 if (!IS_POSIXACL(dentry->d_inode))
3041                         supp[0] &= ~FATTR4_WORD0_ACL;
3042                 if (!contextsupport)
3043                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3044                 if (!supp[2]) {
3045                         p = xdr_reserve_space(xdr, 12);
3046                         if (!p)
3047                                 goto out_resource;
3048                         *p++ = cpu_to_be32(2);
3049                         *p++ = cpu_to_be32(supp[0]);
3050                         *p++ = cpu_to_be32(supp[1]);
3051                 } else {
3052                         p = xdr_reserve_space(xdr, 16);
3053                         if (!p)
3054                                 goto out_resource;
3055                         *p++ = cpu_to_be32(3);
3056                         *p++ = cpu_to_be32(supp[0]);
3057                         *p++ = cpu_to_be32(supp[1]);
3058                         *p++ = cpu_to_be32(supp[2]);
3059                 }
3060         }
3061         if (bmval0 & FATTR4_WORD0_TYPE) {
3062                 p = xdr_reserve_space(xdr, 4);
3063                 if (!p)
3064                         goto out_resource;
3065                 dummy = nfs4_file_type(stat.mode);
3066                 if (dummy == NF4BAD) {
3067                         status = nfserr_serverfault;
3068                         goto out;
3069                 }
3070                 *p++ = cpu_to_be32(dummy);
3071         }
3072         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
3073                 p = xdr_reserve_space(xdr, 4);
3074                 if (!p)
3075                         goto out_resource;
3076                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
3077                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
3078                 else
3079                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
3080                                                 NFS4_FH_VOL_RENAME);
3081         }
3082         if (bmval0 & FATTR4_WORD0_CHANGE) {
3083                 p = xdr_reserve_space(xdr, 8);
3084                 if (!p)
3085                         goto out_resource;
3086                 p = encode_change(p, &stat, d_inode(dentry), exp);
3087         }
3088         if (bmval0 & FATTR4_WORD0_SIZE) {
3089                 p = xdr_reserve_space(xdr, 8);
3090                 if (!p)
3091                         goto out_resource;
3092                 p = xdr_encode_hyper(p, stat.size);
3093         }
3094         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
3095                 p = xdr_reserve_space(xdr, 4);
3096                 if (!p)
3097                         goto out_resource;
3098                 *p++ = cpu_to_be32(1);
3099         }
3100         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
3101                 p = xdr_reserve_space(xdr, 4);
3102                 if (!p)
3103                         goto out_resource;
3104                 *p++ = cpu_to_be32(1);
3105         }
3106         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
3107                 p = xdr_reserve_space(xdr, 4);
3108                 if (!p)
3109                         goto out_resource;
3110                 *p++ = cpu_to_be32(0);
3111         }
3112         if (bmval0 & FATTR4_WORD0_FSID) {
3113                 p = xdr_reserve_space(xdr, 16);
3114                 if (!p)
3115                         goto out_resource;
3116                 if (exp->ex_fslocs.migrated) {
3117                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
3118                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
3119                 } else switch(fsid_source(fhp)) {
3120                 case FSIDSOURCE_FSID:
3121                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
3122                         p = xdr_encode_hyper(p, (u64)0);
3123                         break;
3124                 case FSIDSOURCE_DEV:
3125                         *p++ = cpu_to_be32(0);
3126                         *p++ = cpu_to_be32(MAJOR(stat.dev));
3127                         *p++ = cpu_to_be32(0);
3128                         *p++ = cpu_to_be32(MINOR(stat.dev));
3129                         break;
3130                 case FSIDSOURCE_UUID:
3131                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
3132                                                                 EX_UUID_LEN);
3133                         break;
3134                 }
3135         }
3136         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
3137                 p = xdr_reserve_space(xdr, 4);
3138                 if (!p)
3139                         goto out_resource;
3140                 *p++ = cpu_to_be32(0);
3141         }
3142         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
3143                 p = xdr_reserve_space(xdr, 4);
3144                 if (!p)
3145                         goto out_resource;
3146                 *p++ = cpu_to_be32(nn->nfsd4_lease);
3147         }
3148         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
3149                 p = xdr_reserve_space(xdr, 4);
3150                 if (!p)
3151                         goto out_resource;
3152                 *p++ = cpu_to_be32(rdattr_err);
3153         }
3154         if (bmval0 & FATTR4_WORD0_ACL) {
3155                 struct nfs4_ace *ace;
3156
3157                 if (acl == NULL) {
3158                         p = xdr_reserve_space(xdr, 4);
3159                         if (!p)
3160                                 goto out_resource;
3161
3162                         *p++ = cpu_to_be32(0);
3163                         goto out_acl;
3164                 }
3165                 p = xdr_reserve_space(xdr, 4);
3166                 if (!p)
3167                         goto out_resource;
3168                 *p++ = cpu_to_be32(acl->naces);
3169
3170                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
3171                         p = xdr_reserve_space(xdr, 4*3);
3172                         if (!p)
3173                                 goto out_resource;
3174                         *p++ = cpu_to_be32(ace->type);
3175                         *p++ = cpu_to_be32(ace->flag);
3176                         *p++ = cpu_to_be32(ace->access_mask &
3177                                                         NFS4_ACE_MASK_ALL);
3178                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
3179                         if (status)
3180                                 goto out;
3181                 }
3182         }
3183 out_acl:
3184         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
3185                 p = xdr_reserve_space(xdr, 4);
3186                 if (!p)
3187                         goto out_resource;
3188                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
3189                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
3190         }
3191         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
3192                 p = xdr_reserve_space(xdr, 4);
3193                 if (!p)
3194                         goto out_resource;
3195                 *p++ = cpu_to_be32(1);
3196         }
3197         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
3198                 p = xdr_reserve_space(xdr, 4);
3199                 if (!p)
3200                         goto out_resource;
3201                 *p++ = cpu_to_be32(0);
3202         }
3203         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
3204                 p = xdr_reserve_space(xdr, 4);
3205                 if (!p)
3206                         goto out_resource;
3207                 *p++ = cpu_to_be32(1);
3208         }
3209         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
3210                 p = xdr_reserve_space(xdr, 4);
3211                 if (!p)
3212                         goto out_resource;
3213                 *p++ = cpu_to_be32(1);
3214         }
3215         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
3216                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
3217                 if (!p)
3218                         goto out_resource;
3219                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw,
3220                                         fhp->fh_handle.fh_size);
3221         }
3222         if (bmval0 & FATTR4_WORD0_FILEID) {
3223                 p = xdr_reserve_space(xdr, 8);
3224                 if (!p)
3225                         goto out_resource;
3226                 p = xdr_encode_hyper(p, stat.ino);
3227         }
3228         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
3229                 p = xdr_reserve_space(xdr, 8);
3230                 if (!p)
3231                         goto out_resource;
3232                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
3233         }
3234         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
3235                 p = xdr_reserve_space(xdr, 8);
3236                 if (!p)
3237                         goto out_resource;
3238                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
3239         }
3240         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
3241                 p = xdr_reserve_space(xdr, 8);
3242                 if (!p)
3243                         goto out_resource;
3244                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
3245         }
3246         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
3247                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
3248                 if (status)
3249                         goto out;
3250         }
3251         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
3252                 p = xdr_reserve_space(xdr, 4);
3253                 if (!p)
3254                         goto out_resource;
3255                 *p++ = cpu_to_be32(1);
3256         }
3257         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
3258                 p = xdr_reserve_space(xdr, 8);
3259                 if (!p)
3260                         goto out_resource;
3261                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
3262         }
3263         if (bmval0 & FATTR4_WORD0_MAXLINK) {
3264                 p = xdr_reserve_space(xdr, 4);
3265                 if (!p)
3266                         goto out_resource;
3267                 *p++ = cpu_to_be32(255);
3268         }
3269         if (bmval0 & FATTR4_WORD0_MAXNAME) {
3270                 p = xdr_reserve_space(xdr, 4);
3271                 if (!p)
3272                         goto out_resource;
3273                 *p++ = cpu_to_be32(statfs.f_namelen);
3274         }
3275         if (bmval0 & FATTR4_WORD0_MAXREAD) {
3276                 p = xdr_reserve_space(xdr, 8);
3277                 if (!p)
3278                         goto out_resource;
3279                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
3280         }
3281         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
3282                 p = xdr_reserve_space(xdr, 8);
3283                 if (!p)
3284                         goto out_resource;
3285                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
3286         }
3287         if (bmval1 & FATTR4_WORD1_MODE) {
3288                 p = xdr_reserve_space(xdr, 4);
3289                 if (!p)
3290                         goto out_resource;
3291                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
3292         }
3293         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
3294                 p = xdr_reserve_space(xdr, 4);
3295                 if (!p)
3296                         goto out_resource;
3297                 *p++ = cpu_to_be32(1);
3298         }
3299         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
3300                 p = xdr_reserve_space(xdr, 4);
3301                 if (!p)
3302                         goto out_resource;
3303                 *p++ = cpu_to_be32(stat.nlink);
3304         }
3305         if (bmval1 & FATTR4_WORD1_OWNER) {
3306                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
3307                 if (status)
3308                         goto out;
3309         }
3310         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
3311                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
3312                 if (status)
3313                         goto out;
3314         }
3315         if (bmval1 & FATTR4_WORD1_RAWDEV) {
3316                 p = xdr_reserve_space(xdr, 8);
3317                 if (!p)
3318                         goto out_resource;
3319                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
3320                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
3321         }
3322         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
3323                 p = xdr_reserve_space(xdr, 8);
3324                 if (!p)
3325                         goto out_resource;
3326                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
3327                 p = xdr_encode_hyper(p, dummy64);
3328         }
3329         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
3330                 p = xdr_reserve_space(xdr, 8);
3331                 if (!p)
3332                         goto out_resource;
3333                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
3334                 p = xdr_encode_hyper(p, dummy64);
3335         }
3336         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
3337                 p = xdr_reserve_space(xdr, 8);
3338                 if (!p)
3339                         goto out_resource;
3340                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
3341                 p = xdr_encode_hyper(p, dummy64);
3342         }
3343         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
3344                 p = xdr_reserve_space(xdr, 8);
3345                 if (!p)
3346                         goto out_resource;
3347                 dummy64 = (u64)stat.blocks << 9;
3348                 p = xdr_encode_hyper(p, dummy64);
3349         }
3350         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
3351                 p = xdr_reserve_space(xdr, 12);
3352                 if (!p)
3353                         goto out_resource;
3354                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
3355                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
3356         }
3357         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
3358                 p = xdr_reserve_space(xdr, 12);
3359                 if (!p)
3360                         goto out_resource;
3361                 p = encode_time_delta(p, d_inode(dentry));
3362         }
3363         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
3364                 p = xdr_reserve_space(xdr, 12);
3365                 if (!p)
3366                         goto out_resource;
3367                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
3368                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
3369         }
3370         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
3371                 p = xdr_reserve_space(xdr, 12);
3372                 if (!p)
3373                         goto out_resource;
3374                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
3375                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
3376         }
3377         if (bmval1 & FATTR4_WORD1_TIME_CREATE) {
3378                 p = xdr_reserve_space(xdr, 12);
3379                 if (!p)
3380                         goto out_resource;
3381                 p = xdr_encode_hyper(p, (s64)stat.btime.tv_sec);
3382                 *p++ = cpu_to_be32(stat.btime.tv_nsec);
3383         }
3384         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
3385                 u64 ino = stat.ino;
3386
3387                 p = xdr_reserve_space(xdr, 8);
3388                 if (!p)
3389                         goto out_resource;
3390                 /*
3391                  * Get ino of mountpoint in parent filesystem, if not ignoring
3392                  * crossmount and this is the root of a cross-mounted
3393                  * filesystem.
3394                  */
3395                 if (ignore_crossmnt == 0 &&
3396                     dentry == exp->ex_path.mnt->mnt_root) {
3397                         err = nfsd4_get_mounted_on_ino(exp, &ino);
3398                         if (err)
3399                                 goto out_nfserr;
3400                 }
3401                 p = xdr_encode_hyper(p, ino);
3402         }
3403 #ifdef CONFIG_NFSD_PNFS
3404         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
3405                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
3406                 if (status)
3407                         goto out;
3408         }
3409
3410         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
3411                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
3412                 if (status)
3413                         goto out;
3414         }
3415
3416         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
3417                 p = xdr_reserve_space(xdr, 4);
3418                 if (!p)
3419                         goto out_resource;
3420                 *p++ = cpu_to_be32(stat.blksize);
3421         }
3422 #endif /* CONFIG_NFSD_PNFS */
3423         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
3424                 u32 supp[3];
3425
3426                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
3427                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
3428                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
3429                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
3430
3431                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
3432                 if (status)
3433                         goto out;
3434         }
3435
3436 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3437         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
3438                 status = nfsd4_encode_security_label(xdr, rqstp, context,
3439                                                                 contextlen);
3440                 if (status)
3441                         goto out;
3442         }
3443 #endif
3444
3445         if (bmval2 & FATTR4_WORD2_XATTR_SUPPORT) {
3446                 p = xdr_reserve_space(xdr, 4);
3447                 if (!p)
3448                         goto out_resource;
3449                 err = xattr_supports_user_prefix(d_inode(dentry));
3450                 *p++ = cpu_to_be32(err == 0);
3451         }
3452
3453         *attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT);
3454         status = nfs_ok;
3455
3456 out:
3457 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3458         if (context)
3459                 security_release_secctx(context, contextlen);
3460 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3461         kfree(acl);
3462         if (tempfh) {
3463                 fh_put(tempfh);
3464                 kfree(tempfh);
3465         }
3466         if (status)
3467                 xdr_truncate_encode(xdr, starting_len);
3468         return status;
3469 out_nfserr:
3470         status = nfserrno(err);
3471         goto out;
3472 out_resource:
3473         status = nfserr_resource;
3474         goto out;
3475 }
3476
3477 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3478                                 struct xdr_buf *buf, __be32 *p, int bytes)
3479 {
3480         xdr->scratch.iov_len = 0;
3481         memset(buf, 0, sizeof(struct xdr_buf));
3482         buf->head[0].iov_base = p;
3483         buf->head[0].iov_len = 0;
3484         buf->len = 0;
3485         xdr->buf = buf;
3486         xdr->iov = buf->head;
3487         xdr->p = p;
3488         xdr->end = (void *)p + bytes;
3489         buf->buflen = bytes;
3490 }
3491
3492 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3493                         struct svc_fh *fhp, struct svc_export *exp,
3494                         struct dentry *dentry, u32 *bmval,
3495                         struct svc_rqst *rqstp, int ignore_crossmnt)
3496 {
3497         struct xdr_buf dummy;
3498         struct xdr_stream xdr;
3499         __be32 ret;
3500
3501         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
3502         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
3503                                                         ignore_crossmnt);
3504         *p = xdr.p;
3505         return ret;
3506 }
3507
3508 static inline int attributes_need_mount(u32 *bmval)
3509 {
3510         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3511                 return 1;
3512         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3513                 return 1;
3514         return 0;
3515 }
3516
3517 static __be32
3518 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
3519                         const char *name, int namlen)
3520 {
3521         struct svc_export *exp = cd->rd_fhp->fh_export;
3522         struct dentry *dentry;
3523         __be32 nfserr;
3524         int ignore_crossmnt = 0;
3525
3526         dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
3527         if (IS_ERR(dentry))
3528                 return nfserrno(PTR_ERR(dentry));
3529
3530         exp_get(exp);
3531         /*
3532          * In the case of a mountpoint, the client may be asking for
3533          * attributes that are only properties of the underlying filesystem
3534          * as opposed to the cross-mounted file system. In such a case,
3535          * we will not follow the cross mount and will fill the attribtutes
3536          * directly from the mountpoint dentry.
3537          */
3538         if (nfsd_mountpoint(dentry, exp)) {
3539                 int err;
3540
3541                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3542                                 && !attributes_need_mount(cd->rd_bmval)) {
3543                         ignore_crossmnt = 1;
3544                         goto out_encode;
3545                 }
3546                 /*
3547                  * Why the heck aren't we just using nfsd_lookup??
3548                  * Different "."/".." handling?  Something else?
3549                  * At least, add a comment here to explain....
3550                  */
3551                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3552                 if (err) {
3553                         nfserr = nfserrno(err);
3554                         goto out_put;
3555                 }
3556                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3557                 if (nfserr)
3558                         goto out_put;
3559
3560         }
3561 out_encode:
3562         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3563                                         cd->rd_rqstp, ignore_crossmnt);
3564 out_put:
3565         dput(dentry);
3566         exp_put(exp);
3567         return nfserr;
3568 }
3569
3570 static __be32 *
3571 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3572 {
3573         __be32 *p;
3574
3575         p = xdr_reserve_space(xdr, 20);
3576         if (!p)
3577                 return NULL;
3578         *p++ = htonl(2);
3579         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3580         *p++ = htonl(0);                         /* bmval1 */
3581
3582         *p++ = htonl(4);     /* attribute length */
3583         *p++ = nfserr;       /* no htonl */
3584         return p;
3585 }
3586
3587 static int
3588 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3589                     loff_t offset, u64 ino, unsigned int d_type)
3590 {
3591         struct readdir_cd *ccd = ccdv;
3592         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3593         struct xdr_stream *xdr = cd->xdr;
3594         int start_offset = xdr->buf->len;
3595         int cookie_offset;
3596         u32 name_and_cookie;
3597         int entry_bytes;
3598         __be32 nfserr = nfserr_toosmall;
3599         __be64 wire_offset;
3600         __be32 *p;
3601
3602         /* In nfsv4, "." and ".." never make it onto the wire.. */
3603         if (name && isdotent(name, namlen)) {
3604                 cd->common.err = nfs_ok;
3605                 return 0;
3606         }
3607
3608         if (cd->cookie_offset) {
3609                 wire_offset = cpu_to_be64(offset);
3610                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3611                                                         &wire_offset, 8);
3612         }
3613
3614         p = xdr_reserve_space(xdr, 4);
3615         if (!p)
3616                 goto fail;
3617         *p++ = xdr_one;                             /* mark entry present */
3618         cookie_offset = xdr->buf->len;
3619         p = xdr_reserve_space(xdr, 3*4 + namlen);
3620         if (!p)
3621                 goto fail;
3622         p = xdr_encode_hyper(p, OFFSET_MAX);        /* offset of next entry */
3623         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3624
3625         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3626         switch (nfserr) {
3627         case nfs_ok:
3628                 break;
3629         case nfserr_resource:
3630                 nfserr = nfserr_toosmall;
3631                 goto fail;
3632         case nfserr_noent:
3633                 xdr_truncate_encode(xdr, start_offset);
3634                 goto skip_entry;
3635         case nfserr_jukebox:
3636                 /*
3637                  * The pseudoroot should only display dentries that lead to
3638                  * exports. If we get EJUKEBOX here, then we can't tell whether
3639                  * this entry should be included. Just fail the whole READDIR
3640                  * with NFS4ERR_DELAY in that case, and hope that the situation
3641                  * will resolve itself by the client's next attempt.
3642                  */
3643                 if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT)
3644                         goto fail;
3645                 fallthrough;
3646         default:
3647                 /*
3648                  * If the client requested the RDATTR_ERROR attribute,
3649                  * we stuff the error code into this attribute
3650                  * and continue.  If this attribute was not requested,
3651                  * then in accordance with the spec, we fail the
3652                  * entire READDIR operation(!)
3653                  */
3654                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3655                         goto fail;
3656                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3657                 if (p == NULL) {
3658                         nfserr = nfserr_toosmall;
3659                         goto fail;
3660                 }
3661         }
3662         nfserr = nfserr_toosmall;
3663         entry_bytes = xdr->buf->len - start_offset;
3664         if (entry_bytes > cd->rd_maxcount)
3665                 goto fail;
3666         cd->rd_maxcount -= entry_bytes;
3667         /*
3668          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and
3669          * notes that it could be zero. If it is zero, then the server
3670          * should enforce only the rd_maxcount value.
3671          */
3672         if (cd->rd_dircount) {
3673                 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3674                 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3675                         goto fail;
3676                 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3677                 if (!cd->rd_dircount)
3678                         cd->rd_maxcount = 0;
3679         }
3680
3681         cd->cookie_offset = cookie_offset;
3682 skip_entry:
3683         cd->common.err = nfs_ok;
3684         return 0;
3685 fail:
3686         xdr_truncate_encode(xdr, start_offset);
3687         cd->common.err = nfserr;
3688         return -EINVAL;
3689 }
3690
3691 static __be32
3692 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3693 {
3694         __be32 *p;
3695
3696         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3697         if (!p)
3698                 return nfserr_resource;
3699         *p++ = cpu_to_be32(sid->si_generation);
3700         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3701                                         sizeof(stateid_opaque_t));
3702         return 0;
3703 }
3704
3705 static __be32
3706 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr,
3707                     union nfsd4_op_u *u)
3708 {
3709         struct nfsd4_access *access = &u->access;
3710         struct xdr_stream *xdr = resp->xdr;
3711         __be32 *p;
3712
3713         p = xdr_reserve_space(xdr, 8);
3714         if (!p)
3715                 return nfserr_resource;
3716         *p++ = cpu_to_be32(access->ac_supported);
3717         *p++ = cpu_to_be32(access->ac_resp_access);
3718         return 0;
3719 }
3720
3721 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3722                                                 union nfsd4_op_u *u)
3723 {
3724         struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
3725         struct xdr_stream *xdr = resp->xdr;
3726         __be32 *p;
3727
3728         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3729         if (!p)
3730                 return nfserr_resource;
3731         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3732                                         NFS4_MAX_SESSIONID_LEN);
3733         *p++ = cpu_to_be32(bcts->dir);
3734         /* Upshifting from TCP to RDMA is not supported */
3735         *p++ = cpu_to_be32(0);
3736         return 0;
3737 }
3738
3739 static __be32
3740 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr,
3741                    union nfsd4_op_u *u)
3742 {
3743         struct nfsd4_close *close = &u->close;
3744         struct xdr_stream *xdr = resp->xdr;
3745
3746         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3747 }
3748
3749
3750 static __be32
3751 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr,
3752                     union nfsd4_op_u *u)
3753 {
3754         struct nfsd4_commit *commit = &u->commit;
3755         struct xdr_stream *xdr = resp->xdr;
3756         __be32 *p;
3757
3758         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3759         if (!p)
3760                 return nfserr_resource;
3761         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3762                                                 NFS4_VERIFIER_SIZE);
3763         return 0;
3764 }
3765
3766 static __be32
3767 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr,
3768                     union nfsd4_op_u *u)
3769 {
3770         struct nfsd4_create *create = &u->create;
3771         struct xdr_stream *xdr = resp->xdr;
3772         __be32 *p;
3773
3774         p = xdr_reserve_space(xdr, 20);
3775         if (!p)
3776                 return nfserr_resource;
3777         encode_cinfo(p, &create->cr_cinfo);
3778         return nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3779                         create->cr_bmval[1], create->cr_bmval[2]);
3780 }
3781
3782 static __be32
3783 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr,
3784                      union nfsd4_op_u *u)
3785 {
3786         struct nfsd4_getattr *getattr = &u->getattr;
3787         struct svc_fh *fhp = getattr->ga_fhp;
3788         struct xdr_stream *xdr = resp->xdr;
3789
3790         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3791                                     getattr->ga_bmval, resp->rqstp, 0);
3792 }
3793
3794 static __be32
3795 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr,
3796                    union nfsd4_op_u *u)
3797 {
3798         struct svc_fh **fhpp = &u->getfh;
3799         struct xdr_stream *xdr = resp->xdr;
3800         struct svc_fh *fhp = *fhpp;
3801         unsigned int len;
3802         __be32 *p;
3803
3804         len = fhp->fh_handle.fh_size;
3805         p = xdr_reserve_space(xdr, len + 4);
3806         if (!p)
3807                 return nfserr_resource;
3808         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, len);
3809         return 0;
3810 }
3811
3812 /*
3813 * Including all fields other than the name, a LOCK4denied structure requires
3814 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3815 */
3816 static __be32
3817 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3818 {
3819         struct xdr_netobj *conf = &ld->ld_owner;
3820         __be32 *p;
3821
3822 again:
3823         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3824         if (!p) {
3825                 /*
3826                  * Don't fail to return the result just because we can't
3827                  * return the conflicting open:
3828                  */
3829                 if (conf->len) {
3830                         kfree(conf->data);
3831                         conf->len = 0;
3832                         conf->data = NULL;
3833                         goto again;
3834                 }
3835                 return nfserr_resource;
3836         }
3837         p = xdr_encode_hyper(p, ld->ld_start);
3838         p = xdr_encode_hyper(p, ld->ld_length);
3839         *p++ = cpu_to_be32(ld->ld_type);
3840         if (conf->len) {
3841                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3842                 p = xdr_encode_opaque(p, conf->data, conf->len);
3843                 kfree(conf->data);
3844         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3845                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3846                 *p++ = cpu_to_be32(0); /* length of owner name */
3847         }
3848         return nfserr_denied;
3849 }
3850
3851 static __be32
3852 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr,
3853                   union nfsd4_op_u *u)
3854 {
3855         struct nfsd4_lock *lock = &u->lock;
3856         struct xdr_stream *xdr = resp->xdr;
3857
3858         if (!nfserr)
3859                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3860         else if (nfserr == nfserr_denied)
3861                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3862
3863         return nfserr;
3864 }
3865
3866 static __be32
3867 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr,
3868                    union nfsd4_op_u *u)
3869 {
3870         struct nfsd4_lockt *lockt = &u->lockt;
3871         struct xdr_stream *xdr = resp->xdr;
3872
3873         if (nfserr == nfserr_denied)
3874                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3875         return nfserr;
3876 }
3877
3878 static __be32
3879 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr,
3880                    union nfsd4_op_u *u)
3881 {
3882         struct nfsd4_locku *locku = &u->locku;
3883         struct xdr_stream *xdr = resp->xdr;
3884
3885         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3886 }
3887
3888
3889 static __be32
3890 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr,
3891                   union nfsd4_op_u *u)
3892 {
3893         struct nfsd4_link *link = &u->link;
3894         struct xdr_stream *xdr = resp->xdr;
3895         __be32 *p;
3896
3897         p = xdr_reserve_space(xdr, 20);
3898         if (!p)
3899                 return nfserr_resource;
3900         p = encode_cinfo(p, &link->li_cinfo);
3901         return 0;
3902 }
3903
3904
3905 static __be32
3906 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr,
3907                   union nfsd4_op_u *u)
3908 {
3909         struct nfsd4_open *open = &u->open;
3910         struct xdr_stream *xdr = resp->xdr;
3911         __be32 *p;
3912
3913         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3914         if (nfserr)
3915                 return nfserr;
3916         p = xdr_reserve_space(xdr, 24);
3917         if (!p)
3918                 return nfserr_resource;
3919         p = encode_cinfo(p, &open->op_cinfo);
3920         *p++ = cpu_to_be32(open->op_rflags);
3921
3922         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3923                                         open->op_bmval[2]);
3924         if (nfserr)
3925                 return nfserr;
3926
3927         p = xdr_reserve_space(xdr, 4);
3928         if (!p)
3929                 return nfserr_resource;
3930
3931         *p++ = cpu_to_be32(open->op_delegate_type);
3932         switch (open->op_delegate_type) {
3933         case NFS4_OPEN_DELEGATE_NONE:
3934                 break;
3935         case NFS4_OPEN_DELEGATE_READ:
3936                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3937                 if (nfserr)
3938                         return nfserr;
3939                 p = xdr_reserve_space(xdr, 20);
3940                 if (!p)
3941                         return nfserr_resource;
3942                 *p++ = cpu_to_be32(open->op_recall);
3943
3944                 /*
3945                  * TODO: ACE's in delegations
3946                  */
3947                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3948                 *p++ = cpu_to_be32(0);
3949                 *p++ = cpu_to_be32(0);
3950                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3951                 break;
3952         case NFS4_OPEN_DELEGATE_WRITE:
3953                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3954                 if (nfserr)
3955                         return nfserr;
3956                 p = xdr_reserve_space(xdr, 32);
3957                 if (!p)
3958                         return nfserr_resource;
3959                 *p++ = cpu_to_be32(0);
3960
3961                 /*
3962                  * TODO: space_limit's in delegations
3963                  */
3964                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3965                 *p++ = cpu_to_be32(~(u32)0);
3966                 *p++ = cpu_to_be32(~(u32)0);
3967
3968                 /*
3969                  * TODO: ACE's in delegations
3970                  */
3971                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3972                 *p++ = cpu_to_be32(0);
3973                 *p++ = cpu_to_be32(0);
3974                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3975                 break;
3976         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3977                 switch (open->op_why_no_deleg) {
3978                 case WND4_CONTENTION:
3979                 case WND4_RESOURCE:
3980                         p = xdr_reserve_space(xdr, 8);
3981                         if (!p)
3982                                 return nfserr_resource;
3983                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3984                         /* deleg signaling not supported yet: */
3985                         *p++ = cpu_to_be32(0);
3986                         break;
3987                 default:
3988                         p = xdr_reserve_space(xdr, 4);
3989                         if (!p)
3990                                 return nfserr_resource;
3991                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3992                 }
3993                 break;
3994         default:
3995                 BUG();
3996         }
3997         /* XXX save filehandle here */
3998         return 0;
3999 }
4000
4001 static __be32
4002 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr,
4003                           union nfsd4_op_u *u)
4004 {
4005         struct nfsd4_open_confirm *oc = &u->open_confirm;
4006         struct xdr_stream *xdr = resp->xdr;
4007
4008         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
4009 }
4010
4011 static __be32
4012 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr,
4013                             union nfsd4_op_u *u)
4014 {
4015         struct nfsd4_open_downgrade *od = &u->open_downgrade;
4016         struct xdr_stream *xdr = resp->xdr;
4017
4018         return nfsd4_encode_stateid(xdr, &od->od_stateid);
4019 }
4020
4021 static __be32 nfsd4_encode_splice_read(
4022                                 struct nfsd4_compoundres *resp,
4023                                 struct nfsd4_read *read,
4024                                 struct file *file, unsigned long maxcount)
4025 {
4026         struct xdr_stream *xdr = resp->xdr;
4027         struct xdr_buf *buf = xdr->buf;
4028         int status, space_left;
4029         __be32 nfserr;
4030
4031         /* Make sure there will be room for padding if needed */
4032         if (xdr->end - xdr->p < 1)
4033                 return nfserr_resource;
4034
4035         nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
4036                                   file, read->rd_offset, &maxcount,
4037                                   &read->rd_eof);
4038         read->rd_length = maxcount;
4039         if (nfserr)
4040                 goto out_err;
4041         status = svc_encode_result_payload(read->rd_rqstp,
4042                                            buf->head[0].iov_len, maxcount);
4043         if (status) {
4044                 nfserr = nfserrno(status);
4045                 goto out_err;
4046         }
4047
4048         buf->page_len = maxcount;
4049         buf->len += maxcount;
4050         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
4051                                                         / PAGE_SIZE;
4052
4053         /* Use rest of head for padding and remaining ops: */
4054         buf->tail[0].iov_base = xdr->p;
4055         buf->tail[0].iov_len = 0;
4056         xdr->iov = buf->tail;
4057         if (maxcount&3) {
4058                 int pad = 4 - (maxcount&3);
4059
4060                 *(xdr->p++) = 0;
4061
4062                 buf->tail[0].iov_base += maxcount&3;
4063                 buf->tail[0].iov_len = pad;
4064                 buf->len += pad;
4065         }
4066
4067         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
4068                                 buf->buflen - buf->len);
4069         buf->buflen = buf->len + space_left;
4070         xdr->end = (__be32 *)((void *)xdr->end + space_left);
4071
4072         return 0;
4073
4074 out_err:
4075         /*
4076          * nfsd_splice_actor may have already messed with the
4077          * page length; reset it so as not to confuse
4078          * xdr_truncate_encode in our caller.
4079          */
4080         buf->page_len = 0;
4081         return nfserr;
4082 }
4083
4084 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
4085                                  struct nfsd4_read *read,
4086                                  struct file *file, unsigned long maxcount)
4087 {
4088         struct xdr_stream *xdr = resp->xdr;
4089         unsigned int starting_len = xdr->buf->len;
4090         __be32 zero = xdr_zero;
4091         __be32 nfserr;
4092
4093         read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, maxcount);
4094         if (read->rd_vlen < 0)
4095                 return nfserr_resource;
4096
4097         nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
4098                             resp->rqstp->rq_vec, read->rd_vlen, &maxcount,
4099                             &read->rd_eof);
4100         read->rd_length = maxcount;
4101         if (nfserr)
4102                 return nfserr;
4103         if (svc_encode_result_payload(resp->rqstp, starting_len, maxcount))
4104                 return nfserr_io;
4105         xdr_truncate_encode(xdr, starting_len + xdr_align_size(maxcount));
4106
4107         write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero,
4108                                xdr_pad_size(maxcount));
4109         return nfs_ok;
4110 }
4111
4112 static __be32
4113 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
4114                   union nfsd4_op_u *u)
4115 {
4116         struct nfsd4_read *read = &u->read;
4117         bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags);
4118         unsigned long maxcount;
4119         struct xdr_stream *xdr = resp->xdr;
4120         struct file *file;
4121         int starting_len = xdr->buf->len;
4122         __be32 *p;
4123
4124         if (nfserr)
4125                 return nfserr;
4126         file = read->rd_nf->nf_file;
4127
4128         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
4129         if (!p) {
4130                 WARN_ON_ONCE(splice_ok);
4131                 return nfserr_resource;
4132         }
4133         if (resp->xdr->buf->page_len && splice_ok) {
4134                 WARN_ON_ONCE(1);
4135                 return nfserr_serverfault;
4136         }
4137         xdr_commit_encode(xdr);
4138
4139         maxcount = min_t(unsigned long, read->rd_length,
4140                          (xdr->buf->buflen - xdr->buf->len));
4141
4142         if (file->f_op->splice_read && splice_ok)
4143                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4144         else
4145                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
4146         if (nfserr) {
4147                 xdr_truncate_encode(xdr, starting_len);
4148                 return nfserr;
4149         }
4150
4151         p = xdr_encode_bool(p, read->rd_eof);
4152         *p = cpu_to_be32(read->rd_length);
4153         return nfs_ok;
4154 }
4155
4156 static __be32
4157 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr,
4158                       union nfsd4_op_u *u)
4159 {
4160         struct nfsd4_readlink *readlink = &u->readlink;
4161         __be32 *p, *maxcount_p, zero = xdr_zero;
4162         struct xdr_stream *xdr = resp->xdr;
4163         int length_offset = xdr->buf->len;
4164         int maxcount, status;
4165
4166         maxcount_p = xdr_reserve_space(xdr, XDR_UNIT);
4167         if (!maxcount_p)
4168                 return nfserr_resource;
4169         maxcount = PAGE_SIZE;
4170
4171         p = xdr_reserve_space(xdr, maxcount);
4172         if (!p)
4173                 return nfserr_resource;
4174         /*
4175          * XXX: By default, vfs_readlink() will truncate symlinks if they
4176          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
4177          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
4178          * that truncation occurred, and return NFS4ERR_RESOURCE.
4179          */
4180         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
4181                                                 (char *)p, &maxcount);
4182         if (nfserr == nfserr_isdir)
4183                 nfserr = nfserr_inval;
4184         if (nfserr)
4185                 goto out_err;
4186         status = svc_encode_result_payload(readlink->rl_rqstp, length_offset,
4187                                            maxcount);
4188         if (status) {
4189                 nfserr = nfserrno(status);
4190                 goto out_err;
4191         }
4192         *maxcount_p = cpu_to_be32(maxcount);
4193         xdr_truncate_encode(xdr, length_offset + 4 + xdr_align_size(maxcount));
4194         write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero,
4195                                xdr_pad_size(maxcount));
4196         return nfs_ok;
4197
4198 out_err:
4199         xdr_truncate_encode(xdr, length_offset);
4200         return nfserr;
4201 }
4202
4203 static __be32
4204 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr,
4205                      union nfsd4_op_u *u)
4206 {
4207         struct nfsd4_readdir *readdir = &u->readdir;
4208         int maxcount;
4209         int bytes_left;
4210         loff_t offset;
4211         __be64 wire_offset;
4212         struct xdr_stream *xdr = resp->xdr;
4213         int starting_len = xdr->buf->len;
4214         __be32 *p;
4215
4216         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
4217         if (!p)
4218                 return nfserr_resource;
4219
4220         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
4221         *p++ = cpu_to_be32(0);
4222         *p++ = cpu_to_be32(0);
4223         xdr->buf->head[0].iov_len = (char *)xdr->p -
4224                                     (char *)xdr->buf->head[0].iov_base;
4225
4226         /*
4227          * Number of bytes left for directory entries allowing for the
4228          * final 8 bytes of the readdir and a following failed op:
4229          */
4230         bytes_left = xdr->buf->buflen - xdr->buf->len
4231                         - COMPOUND_ERR_SLACK_SPACE - 8;
4232         if (bytes_left < 0) {
4233                 nfserr = nfserr_resource;
4234                 goto err_no_verf;
4235         }
4236         maxcount = svc_max_payload(resp->rqstp);
4237         maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
4238         /*
4239          * Note the rfc defines rd_maxcount as the size of the
4240          * READDIR4resok structure, which includes the verifier above
4241          * and the 8 bytes encoded at the end of this function:
4242          */
4243         if (maxcount < 16) {
4244                 nfserr = nfserr_toosmall;
4245                 goto err_no_verf;
4246         }
4247         maxcount = min_t(int, maxcount-16, bytes_left);
4248
4249         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
4250         if (!readdir->rd_dircount)
4251                 readdir->rd_dircount = svc_max_payload(resp->rqstp);
4252
4253         readdir->xdr = xdr;
4254         readdir->rd_maxcount = maxcount;
4255         readdir->common.err = 0;
4256         readdir->cookie_offset = 0;
4257
4258         offset = readdir->rd_cookie;
4259         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
4260                               &offset,
4261                               &readdir->common, nfsd4_encode_dirent);
4262         if (nfserr == nfs_ok &&
4263             readdir->common.err == nfserr_toosmall &&
4264             xdr->buf->len == starting_len + 8) {
4265                 /* nothing encoded; which limit did we hit?: */
4266                 if (maxcount - 16 < bytes_left)
4267                         /* It was the fault of rd_maxcount: */
4268                         nfserr = nfserr_toosmall;
4269                 else
4270                         /* We ran out of buffer space: */
4271                         nfserr = nfserr_resource;
4272         }
4273         if (nfserr)
4274                 goto err_no_verf;
4275
4276         if (readdir->cookie_offset) {
4277                 wire_offset = cpu_to_be64(offset);
4278                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
4279                                                         &wire_offset, 8);
4280         }
4281
4282         p = xdr_reserve_space(xdr, 8);
4283         if (!p) {
4284                 WARN_ON_ONCE(1);
4285                 goto err_no_verf;
4286         }
4287         *p++ = 0;       /* no more entries */
4288         *p++ = htonl(readdir->common.err == nfserr_eof);
4289
4290         return 0;
4291 err_no_verf:
4292         xdr_truncate_encode(xdr, starting_len);
4293         return nfserr;
4294 }
4295
4296 static __be32
4297 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr,
4298                     union nfsd4_op_u *u)
4299 {
4300         struct nfsd4_remove *remove = &u->remove;
4301         struct xdr_stream *xdr = resp->xdr;
4302         __be32 *p;
4303
4304         p = xdr_reserve_space(xdr, 20);
4305         if (!p)
4306                 return nfserr_resource;
4307         p = encode_cinfo(p, &remove->rm_cinfo);
4308         return 0;
4309 }
4310
4311 static __be32
4312 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr,
4313                     union nfsd4_op_u *u)
4314 {
4315         struct nfsd4_rename *rename = &u->rename;
4316         struct xdr_stream *xdr = resp->xdr;
4317         __be32 *p;
4318
4319         p = xdr_reserve_space(xdr, 40);
4320         if (!p)
4321                 return nfserr_resource;
4322         p = encode_cinfo(p, &rename->rn_sinfo);
4323         p = encode_cinfo(p, &rename->rn_tinfo);
4324         return 0;
4325 }
4326
4327 static __be32
4328 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
4329 {
4330         u32 i, nflavs, supported;
4331         struct exp_flavor_info *flavs;
4332         struct exp_flavor_info def_flavs[2];
4333         __be32 *p, *flavorsp;
4334         static bool report = true;
4335
4336         if (exp->ex_nflavors) {
4337                 flavs = exp->ex_flavors;
4338                 nflavs = exp->ex_nflavors;
4339         } else { /* Handling of some defaults in absence of real secinfo: */
4340                 flavs = def_flavs;
4341                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
4342                         nflavs = 2;
4343                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
4344                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
4345                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
4346                         nflavs = 1;
4347                         flavs[0].pseudoflavor
4348                                         = svcauth_gss_flavor(exp->ex_client);
4349                 } else {
4350                         nflavs = 1;
4351                         flavs[0].pseudoflavor
4352                                         = exp->ex_client->flavour->flavour;
4353                 }
4354         }
4355
4356         supported = 0;
4357         p = xdr_reserve_space(xdr, 4);
4358         if (!p)
4359                 return nfserr_resource;
4360         flavorsp = p++;         /* to be backfilled later */
4361
4362         for (i = 0; i < nflavs; i++) {
4363                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
4364                 struct rpcsec_gss_info info;
4365
4366                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
4367                         supported++;
4368                         p = xdr_reserve_space(xdr, 4 + 4 +
4369                                               XDR_LEN(info.oid.len) + 4 + 4);
4370                         if (!p)
4371                                 return nfserr_resource;
4372                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
4373                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
4374                         *p++ = cpu_to_be32(info.qop);
4375                         *p++ = cpu_to_be32(info.service);
4376                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
4377                         supported++;
4378                         p = xdr_reserve_space(xdr, 4);
4379                         if (!p)
4380                                 return nfserr_resource;
4381                         *p++ = cpu_to_be32(pf);
4382                 } else {
4383                         if (report)
4384                                 pr_warn("NFS: SECINFO: security flavor %u "
4385                                         "is not supported\n", pf);
4386                 }
4387         }
4388
4389         if (nflavs != supported)
4390                 report = false;
4391         *flavorsp = htonl(supported);
4392         return 0;
4393 }
4394
4395 static __be32
4396 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4397                      union nfsd4_op_u *u)
4398 {
4399         struct nfsd4_secinfo *secinfo = &u->secinfo;
4400         struct xdr_stream *xdr = resp->xdr;
4401
4402         return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
4403 }
4404
4405 static __be32
4406 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
4407                      union nfsd4_op_u *u)
4408 {
4409         struct nfsd4_secinfo_no_name *secinfo = &u->secinfo_no_name;
4410         struct xdr_stream *xdr = resp->xdr;
4411
4412         return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
4413 }
4414
4415 /*
4416  * The SETATTR encode routine is special -- it always encodes a bitmap,
4417  * regardless of the error status.
4418  */
4419 static __be32
4420 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4421                      union nfsd4_op_u *u)
4422 {
4423         struct nfsd4_setattr *setattr = &u->setattr;
4424         struct xdr_stream *xdr = resp->xdr;
4425         __be32 *p;
4426
4427         p = xdr_reserve_space(xdr, 16);
4428         if (!p)
4429                 return nfserr_resource;
4430         if (nfserr) {
4431                 *p++ = cpu_to_be32(3);
4432                 *p++ = cpu_to_be32(0);
4433                 *p++ = cpu_to_be32(0);
4434                 *p++ = cpu_to_be32(0);
4435         }
4436         else {
4437                 *p++ = cpu_to_be32(3);
4438                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
4439                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
4440                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
4441         }
4442         return nfserr;
4443 }
4444
4445 static __be32
4446 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr,
4447                          union nfsd4_op_u *u)
4448 {
4449         struct nfsd4_setclientid *scd = &u->setclientid;
4450         struct xdr_stream *xdr = resp->xdr;
4451         __be32 *p;
4452
4453         if (!nfserr) {
4454                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
4455                 if (!p)
4456                         return nfserr_resource;
4457                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
4458                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
4459                                                 NFS4_VERIFIER_SIZE);
4460         }
4461         else if (nfserr == nfserr_clid_inuse) {
4462                 p = xdr_reserve_space(xdr, 8);
4463                 if (!p)
4464                         return nfserr_resource;
4465                 *p++ = cpu_to_be32(0);
4466                 *p++ = cpu_to_be32(0);
4467         }
4468         return nfserr;
4469 }
4470
4471 static __be32
4472 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr,
4473                    union nfsd4_op_u *u)
4474 {
4475         struct nfsd4_write *write = &u->write;
4476         struct xdr_stream *xdr = resp->xdr;
4477         __be32 *p;
4478
4479         p = xdr_reserve_space(xdr, 16);
4480         if (!p)
4481                 return nfserr_resource;
4482         *p++ = cpu_to_be32(write->wr_bytes_written);
4483         *p++ = cpu_to_be32(write->wr_how_written);
4484         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4485                                                 NFS4_VERIFIER_SIZE);
4486         return 0;
4487 }
4488
4489 static __be32
4490 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
4491                          union nfsd4_op_u *u)
4492 {
4493         struct nfsd4_exchange_id *exid = &u->exchange_id;
4494         struct xdr_stream *xdr = resp->xdr;
4495         __be32 *p;
4496         char *major_id;
4497         char *server_scope;
4498         int major_id_sz;
4499         int server_scope_sz;
4500         uint64_t minor_id = 0;
4501         struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
4502
4503         major_id = nn->nfsd_name;
4504         major_id_sz = strlen(nn->nfsd_name);
4505         server_scope = nn->nfsd_name;
4506         server_scope_sz = strlen(nn->nfsd_name);
4507
4508         p = xdr_reserve_space(xdr,
4509                 8 /* eir_clientid */ +
4510                 4 /* eir_sequenceid */ +
4511                 4 /* eir_flags */ +
4512                 4 /* spr_how */);
4513         if (!p)
4514                 return nfserr_resource;
4515
4516         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
4517         *p++ = cpu_to_be32(exid->seqid);
4518         *p++ = cpu_to_be32(exid->flags);
4519
4520         *p++ = cpu_to_be32(exid->spa_how);
4521
4522         switch (exid->spa_how) {
4523         case SP4_NONE:
4524                 break;
4525         case SP4_MACH_CRED:
4526                 /* spo_must_enforce bitmap: */
4527                 nfserr = nfsd4_encode_bitmap(xdr,
4528                                         exid->spo_must_enforce[0],
4529                                         exid->spo_must_enforce[1],
4530                                         exid->spo_must_enforce[2]);
4531                 if (nfserr)
4532                         return nfserr;
4533                 /* spo_must_allow bitmap: */
4534                 nfserr = nfsd4_encode_bitmap(xdr,
4535                                         exid->spo_must_allow[0],
4536                                         exid->spo_must_allow[1],
4537                                         exid->spo_must_allow[2]);
4538                 if (nfserr)
4539                         return nfserr;
4540                 break;
4541         default:
4542                 WARN_ON_ONCE(1);
4543         }
4544
4545         p = xdr_reserve_space(xdr,
4546                 8 /* so_minor_id */ +
4547                 4 /* so_major_id.len */ +
4548                 (XDR_QUADLEN(major_id_sz) * 4) +
4549                 4 /* eir_server_scope.len */ +
4550                 (XDR_QUADLEN(server_scope_sz) * 4) +
4551                 4 /* eir_server_impl_id.count (0) */);
4552         if (!p)
4553                 return nfserr_resource;
4554
4555         /* The server_owner struct */
4556         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
4557         /* major id */
4558         p = xdr_encode_opaque(p, major_id, major_id_sz);
4559
4560         /* Server scope */
4561         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4562
4563         /* Implementation id */
4564         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
4565         return 0;
4566 }
4567
4568 static __be32
4569 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4570                             union nfsd4_op_u *u)
4571 {
4572         struct nfsd4_create_session *sess = &u->create_session;
4573         struct xdr_stream *xdr = resp->xdr;
4574         __be32 *p;
4575
4576         p = xdr_reserve_space(xdr, 24);
4577         if (!p)
4578                 return nfserr_resource;
4579         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4580                                         NFS4_MAX_SESSIONID_LEN);
4581         *p++ = cpu_to_be32(sess->seqid);
4582         *p++ = cpu_to_be32(sess->flags);
4583
4584         p = xdr_reserve_space(xdr, 28);
4585         if (!p)
4586                 return nfserr_resource;
4587         *p++ = cpu_to_be32(0); /* headerpadsz */
4588         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4589         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4590         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4591         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4592         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4593         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4594
4595         if (sess->fore_channel.nr_rdma_attrs) {
4596                 p = xdr_reserve_space(xdr, 4);
4597                 if (!p)
4598                         return nfserr_resource;
4599                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4600         }
4601
4602         p = xdr_reserve_space(xdr, 28);
4603         if (!p)
4604                 return nfserr_resource;
4605         *p++ = cpu_to_be32(0); /* headerpadsz */
4606         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4607         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4608         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4609         *p++ = cpu_to_be32(sess->back_channel.maxops);
4610         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4611         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4612
4613         if (sess->back_channel.nr_rdma_attrs) {
4614                 p = xdr_reserve_space(xdr, 4);
4615                 if (!p)
4616                         return nfserr_resource;
4617                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4618         }
4619         return 0;
4620 }
4621
4622 static __be32
4623 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4624                       union nfsd4_op_u *u)
4625 {
4626         struct nfsd4_sequence *seq = &u->sequence;
4627         struct xdr_stream *xdr = resp->xdr;
4628         __be32 *p;
4629
4630         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4631         if (!p)
4632                 return nfserr_resource;
4633         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4634                                         NFS4_MAX_SESSIONID_LEN);
4635         *p++ = cpu_to_be32(seq->seqid);
4636         *p++ = cpu_to_be32(seq->slotid);
4637         /* Note slotid's are numbered from zero: */
4638         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4639         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4640         *p++ = cpu_to_be32(seq->status_flags);
4641
4642         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4643         return 0;
4644 }
4645
4646 static __be32
4647 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4648                           union nfsd4_op_u *u)
4649 {
4650         struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
4651         struct xdr_stream *xdr = resp->xdr;
4652         struct nfsd4_test_stateid_id *stateid, *next;
4653         __be32 *p;
4654
4655         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4656         if (!p)
4657                 return nfserr_resource;
4658         *p++ = htonl(test_stateid->ts_num_ids);
4659
4660         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4661                 *p++ = stateid->ts_id_status;
4662         }
4663
4664         return 0;
4665 }
4666
4667 #ifdef CONFIG_NFSD_PNFS
4668 static __be32
4669 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4670                 union nfsd4_op_u *u)
4671 {
4672         struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
4673         struct xdr_stream *xdr = resp->xdr;
4674         const struct nfsd4_layout_ops *ops;
4675         u32 starting_len = xdr->buf->len, needed_len;
4676         __be32 *p;
4677
4678         p = xdr_reserve_space(xdr, 4);
4679         if (!p)
4680                 return nfserr_resource;
4681
4682         *p++ = cpu_to_be32(gdev->gd_layout_type);
4683
4684         /* If maxcount is 0 then just update notifications */
4685         if (gdev->gd_maxcount != 0) {
4686                 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4687                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4688                 if (nfserr) {
4689                         /*
4690                          * We don't bother to burden the layout drivers with
4691                          * enforcing gd_maxcount, just tell the client to
4692                          * come back with a bigger buffer if it's not enough.
4693                          */
4694                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4695                                 goto toosmall;
4696                         return nfserr;
4697                 }
4698         }
4699
4700         if (gdev->gd_notify_types) {
4701                 p = xdr_reserve_space(xdr, 4 + 4);
4702                 if (!p)
4703                         return nfserr_resource;
4704                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4705                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4706         } else {
4707                 p = xdr_reserve_space(xdr, 4);
4708                 if (!p)
4709                         return nfserr_resource;
4710                 *p++ = 0;
4711         }
4712
4713         return 0;
4714 toosmall:
4715         dprintk("%s: maxcount too small\n", __func__);
4716         needed_len = xdr->buf->len + 4 /* notifications */;
4717         xdr_truncate_encode(xdr, starting_len);
4718         p = xdr_reserve_space(xdr, 4);
4719         if (!p)
4720                 return nfserr_resource;
4721         *p++ = cpu_to_be32(needed_len);
4722         return nfserr_toosmall;
4723 }
4724
4725 static __be32
4726 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4727                 union nfsd4_op_u *u)
4728 {
4729         struct nfsd4_layoutget *lgp = &u->layoutget;
4730         struct xdr_stream *xdr = resp->xdr;
4731         const struct nfsd4_layout_ops *ops;
4732         __be32 *p;
4733
4734         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4735         if (!p)
4736                 return nfserr_resource;
4737
4738         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4739         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4740         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4741                                     sizeof(stateid_opaque_t));
4742
4743         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4744         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4745         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4746         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4747         *p++ = cpu_to_be32(lgp->lg_layout_type);
4748
4749         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4750         return ops->encode_layoutget(xdr, lgp);
4751 }
4752
4753 static __be32
4754 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4755                           union nfsd4_op_u *u)
4756 {
4757         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
4758         struct xdr_stream *xdr = resp->xdr;
4759         __be32 *p;
4760
4761         p = xdr_reserve_space(xdr, 4);
4762         if (!p)
4763                 return nfserr_resource;
4764         *p++ = cpu_to_be32(lcp->lc_size_chg);
4765         if (lcp->lc_size_chg) {
4766                 p = xdr_reserve_space(xdr, 8);
4767                 if (!p)
4768                         return nfserr_resource;
4769                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4770         }
4771
4772         return 0;
4773 }
4774
4775 static __be32
4776 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4777                 union nfsd4_op_u *u)
4778 {
4779         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
4780         struct xdr_stream *xdr = resp->xdr;
4781         __be32 *p;
4782
4783         p = xdr_reserve_space(xdr, 4);
4784         if (!p)
4785                 return nfserr_resource;
4786         *p++ = cpu_to_be32(lrp->lrs_present);
4787         if (lrp->lrs_present)
4788                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4789         return 0;
4790 }
4791 #endif /* CONFIG_NFSD_PNFS */
4792
4793 static __be32
4794 nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
4795                 struct nfsd42_write_res *write, bool sync)
4796 {
4797         __be32 *p;
4798         p = xdr_reserve_space(resp->xdr, 4);
4799         if (!p)
4800                 return nfserr_resource;
4801
4802         if (sync)
4803                 *p++ = cpu_to_be32(0);
4804         else {
4805                 __be32 nfserr;
4806                 *p++ = cpu_to_be32(1);
4807                 nfserr = nfsd4_encode_stateid(resp->xdr, &write->cb_stateid);
4808                 if (nfserr)
4809                         return nfserr;
4810         }
4811         p = xdr_reserve_space(resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
4812         if (!p)
4813                 return nfserr_resource;
4814
4815         p = xdr_encode_hyper(p, write->wr_bytes_written);
4816         *p++ = cpu_to_be32(write->wr_stable_how);
4817         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4818                                     NFS4_VERIFIER_SIZE);
4819         return nfs_ok;
4820 }
4821
4822 static __be32
4823 nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns)
4824 {
4825         struct xdr_stream *xdr = resp->xdr;
4826         struct nfs42_netaddr *addr;
4827         __be32 *p;
4828
4829         p = xdr_reserve_space(xdr, 4);
4830         *p++ = cpu_to_be32(ns->nl4_type);
4831
4832         switch (ns->nl4_type) {
4833         case NL4_NETADDR:
4834                 addr = &ns->u.nl4_addr;
4835
4836                 /* netid_len, netid, uaddr_len, uaddr (port included
4837                  * in RPCBIND_MAXUADDRLEN)
4838                  */
4839                 p = xdr_reserve_space(xdr,
4840                         4 /* netid len */ +
4841                         (XDR_QUADLEN(addr->netid_len) * 4) +
4842                         4 /* uaddr len */ +
4843                         (XDR_QUADLEN(addr->addr_len) * 4));
4844                 if (!p)
4845                         return nfserr_resource;
4846
4847                 *p++ = cpu_to_be32(addr->netid_len);
4848                 p = xdr_encode_opaque_fixed(p, addr->netid,
4849                                             addr->netid_len);
4850                 *p++ = cpu_to_be32(addr->addr_len);
4851                 p = xdr_encode_opaque_fixed(p, addr->addr,
4852                                         addr->addr_len);
4853                 break;
4854         default:
4855                 WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR);
4856                 return nfserr_inval;
4857         }
4858
4859         return 0;
4860 }
4861
4862 static __be32
4863 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4864                   union nfsd4_op_u *u)
4865 {
4866         struct nfsd4_copy *copy = &u->copy;
4867         __be32 *p;
4868
4869         nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
4870                                          nfsd4_copy_is_sync(copy));
4871         if (nfserr)
4872                 return nfserr;
4873
4874         p = xdr_reserve_space(resp->xdr, 4 + 4);
4875         *p++ = xdr_one; /* cr_consecutive */
4876         *p = nfsd4_copy_is_sync(copy) ? xdr_one : xdr_zero;
4877         return 0;
4878 }
4879
4880 static __be32
4881 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
4882                             union nfsd4_op_u *u)
4883 {
4884         struct nfsd4_offload_status *os = &u->offload_status;
4885         struct xdr_stream *xdr = resp->xdr;
4886         __be32 *p;
4887
4888         p = xdr_reserve_space(xdr, 8 + 4);
4889         if (!p)
4890                 return nfserr_resource;
4891         p = xdr_encode_hyper(p, os->count);
4892         *p++ = cpu_to_be32(0);
4893         return nfserr;
4894 }
4895
4896 static __be32
4897 nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
4898                             struct nfsd4_read *read)
4899 {
4900         bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags);
4901         struct file *file = read->rd_nf->nf_file;
4902         struct xdr_stream *xdr = resp->xdr;
4903         unsigned long maxcount;
4904         __be32 nfserr, *p;
4905
4906         /* Content type, offset, byte count */
4907         p = xdr_reserve_space(xdr, 4 + 8 + 4);
4908         if (!p)
4909                 return nfserr_io;
4910         if (resp->xdr->buf->page_len && splice_ok) {
4911                 WARN_ON_ONCE(splice_ok);
4912                 return nfserr_serverfault;
4913         }
4914
4915         maxcount = min_t(unsigned long, read->rd_length,
4916                          (xdr->buf->buflen - xdr->buf->len));
4917
4918         if (file->f_op->splice_read && splice_ok)
4919                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4920         else
4921                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
4922         if (nfserr)
4923                 return nfserr;
4924
4925         *p++ = cpu_to_be32(NFS4_CONTENT_DATA);
4926         p = xdr_encode_hyper(p, read->rd_offset);
4927         *p = cpu_to_be32(read->rd_length);
4928
4929         return nfs_ok;
4930 }
4931
4932 static __be32
4933 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
4934                        union nfsd4_op_u *u)
4935 {
4936         struct nfsd4_read *read = &u->read;
4937         struct file *file = read->rd_nf->nf_file;
4938         struct xdr_stream *xdr = resp->xdr;
4939         int starting_len = xdr->buf->len;
4940         u32 segments = 0;
4941         __be32 *p;
4942
4943         if (nfserr)
4944                 return nfserr;
4945
4946         /* eof flag, segment count */
4947         p = xdr_reserve_space(xdr, 4 + 4);
4948         if (!p)
4949                 return nfserr_io;
4950         xdr_commit_encode(xdr);
4951
4952         read->rd_eof = read->rd_offset >= i_size_read(file_inode(file));
4953         if (read->rd_eof)
4954                 goto out;
4955
4956         nfserr = nfsd4_encode_read_plus_data(resp, read);
4957         if (nfserr) {
4958                 xdr_truncate_encode(xdr, starting_len);
4959                 return nfserr;
4960         }
4961
4962         segments++;
4963
4964 out:
4965         p = xdr_encode_bool(p, read->rd_eof);
4966         *p = cpu_to_be32(segments);
4967         return nfserr;
4968 }
4969
4970 static __be32
4971 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
4972                          union nfsd4_op_u *u)
4973 {
4974         struct nfsd4_copy_notify *cn = &u->copy_notify;
4975         struct xdr_stream *xdr = resp->xdr;
4976         __be32 *p;
4977
4978         if (nfserr)
4979                 return nfserr;
4980
4981         /* 8 sec, 4 nsec */
4982         p = xdr_reserve_space(xdr, 12);
4983         if (!p)
4984                 return nfserr_resource;
4985
4986         /* cnr_lease_time */
4987         p = xdr_encode_hyper(p, cn->cpn_sec);
4988         *p++ = cpu_to_be32(cn->cpn_nsec);
4989
4990         /* cnr_stateid */
4991         nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid);
4992         if (nfserr)
4993                 return nfserr;
4994
4995         /* cnr_src.nl_nsvr */
4996         p = xdr_reserve_space(xdr, 4);
4997         if (!p)
4998                 return nfserr_resource;
4999
5000         *p++ = cpu_to_be32(1);
5001
5002         nfserr = nfsd42_encode_nl4_server(resp, cn->cpn_src);
5003         return nfserr;
5004 }
5005
5006 static __be32
5007 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
5008                   union nfsd4_op_u *u)
5009 {
5010         struct nfsd4_seek *seek = &u->seek;
5011         __be32 *p;
5012
5013         p = xdr_reserve_space(resp->xdr, 4 + 8);
5014         *p++ = cpu_to_be32(seek->seek_eof);
5015         p = xdr_encode_hyper(p, seek->seek_pos);
5016
5017         return 0;
5018 }
5019
5020 static __be32
5021 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr,
5022                   union nfsd4_op_u *p)
5023 {
5024         return nfserr;
5025 }
5026
5027 /*
5028  * Encode kmalloc-ed buffer in to XDR stream.
5029  */
5030 static __be32
5031 nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
5032 {
5033         u32 cplen;
5034         __be32 *p;
5035
5036         cplen = min_t(unsigned long, buflen,
5037                       ((void *)xdr->end - (void *)xdr->p));
5038         p = xdr_reserve_space(xdr, cplen);
5039         if (!p)
5040                 return nfserr_resource;
5041
5042         memcpy(p, buf, cplen);
5043         buf += cplen;
5044         buflen -= cplen;
5045
5046         while (buflen) {
5047                 cplen = min_t(u32, buflen, PAGE_SIZE);
5048                 p = xdr_reserve_space(xdr, cplen);
5049                 if (!p)
5050                         return nfserr_resource;
5051
5052                 memcpy(p, buf, cplen);
5053
5054                 if (cplen < PAGE_SIZE) {
5055                         /*
5056                          * We're done, with a length that wasn't page
5057                          * aligned, so possibly not word aligned. Pad
5058                          * any trailing bytes with 0.
5059                          */
5060                         xdr_encode_opaque_fixed(p, NULL, cplen);
5061                         break;
5062                 }
5063
5064                 buflen -= PAGE_SIZE;
5065                 buf += PAGE_SIZE;
5066         }
5067
5068         return 0;
5069 }
5070
5071 static __be32
5072 nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5073                       union nfsd4_op_u *u)
5074 {
5075         struct nfsd4_getxattr *getxattr = &u->getxattr;
5076         struct xdr_stream *xdr = resp->xdr;
5077         __be32 *p, err;
5078
5079         p = xdr_reserve_space(xdr, 4);
5080         if (!p)
5081                 return nfserr_resource;
5082
5083         *p = cpu_to_be32(getxattr->getxa_len);
5084
5085         if (getxattr->getxa_len == 0)
5086                 return 0;
5087
5088         err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf,
5089                                     getxattr->getxa_len);
5090
5091         kvfree(getxattr->getxa_buf);
5092
5093         return err;
5094 }
5095
5096 static __be32
5097 nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5098                       union nfsd4_op_u *u)
5099 {
5100         struct nfsd4_setxattr *setxattr = &u->setxattr;
5101         struct xdr_stream *xdr = resp->xdr;
5102         __be32 *p;
5103
5104         p = xdr_reserve_space(xdr, 20);
5105         if (!p)
5106                 return nfserr_resource;
5107
5108         encode_cinfo(p, &setxattr->setxa_cinfo);
5109
5110         return 0;
5111 }
5112
5113 /*
5114  * See if there are cookie values that can be rejected outright.
5115  */
5116 static __be32
5117 nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
5118                                 u32 *offsetp)
5119 {
5120         u64 cookie = listxattrs->lsxa_cookie;
5121
5122         /*
5123          * If the cookie is larger than the maximum number we can fit
5124          * in either the buffer we just got back from vfs_listxattr, or,
5125          * XDR-encoded, in the return buffer, it's invalid.
5126          */
5127         if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
5128                 return nfserr_badcookie;
5129
5130         if (cookie > (listxattrs->lsxa_maxcount /
5131                       (XDR_QUADLEN(XATTR_USER_PREFIX_LEN + 2) + 4)))
5132                 return nfserr_badcookie;
5133
5134         *offsetp = (u32)cookie;
5135         return 0;
5136 }
5137
5138 static __be32
5139 nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
5140                         union nfsd4_op_u *u)
5141 {
5142         struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
5143         struct xdr_stream *xdr = resp->xdr;
5144         u32 cookie_offset, count_offset, eof;
5145         u32 left, xdrleft, slen, count;
5146         u32 xdrlen, offset;
5147         u64 cookie;
5148         char *sp;
5149         __be32 status, tmp;
5150         __be32 *p;
5151         u32 nuser;
5152
5153         eof = 1;
5154
5155         status = nfsd4_listxattr_validate_cookie(listxattrs, &offset);
5156         if (status)
5157                 goto out;
5158
5159         /*
5160          * Reserve space for the cookie and the name array count. Record
5161          * the offsets to save them later.
5162          */
5163         cookie_offset = xdr->buf->len;
5164         count_offset = cookie_offset + 8;
5165         p = xdr_reserve_space(xdr, 12);
5166         if (!p) {
5167                 status = nfserr_resource;
5168                 goto out;
5169         }
5170
5171         count = 0;
5172         left = listxattrs->lsxa_len;
5173         sp = listxattrs->lsxa_buf;
5174         nuser = 0;
5175
5176         xdrleft = listxattrs->lsxa_maxcount;
5177
5178         while (left > 0 && xdrleft > 0) {
5179                 slen = strlen(sp);
5180
5181                 /*
5182                  * Check if this is a "user." attribute, skip it if not.
5183                  */
5184                 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
5185                         goto contloop;
5186
5187                 slen -= XATTR_USER_PREFIX_LEN;
5188                 xdrlen = 4 + ((slen + 3) & ~3);
5189                 if (xdrlen > xdrleft) {
5190                         if (count == 0) {
5191                                 /*
5192                                  * Can't even fit the first attribute name.
5193                                  */
5194                                 status = nfserr_toosmall;
5195                                 goto out;
5196                         }
5197                         eof = 0;
5198                         goto wreof;
5199                 }
5200
5201                 left -= XATTR_USER_PREFIX_LEN;
5202                 sp += XATTR_USER_PREFIX_LEN;
5203                 if (nuser++ < offset)
5204                         goto contloop;
5205
5206
5207                 p = xdr_reserve_space(xdr, xdrlen);
5208                 if (!p) {
5209                         status = nfserr_resource;
5210                         goto out;
5211                 }
5212
5213                 xdr_encode_opaque(p, sp, slen);
5214
5215                 xdrleft -= xdrlen;
5216                 count++;
5217 contloop:
5218                 sp += slen + 1;
5219                 left -= slen + 1;
5220         }
5221
5222         /*
5223          * If there were user attributes to copy, but we didn't copy
5224          * any, the offset was too large (e.g. the cookie was invalid).
5225          */
5226         if (nuser > 0 && count == 0) {
5227                 status = nfserr_badcookie;
5228                 goto out;
5229         }
5230
5231 wreof:
5232         p = xdr_reserve_space(xdr, 4);
5233         if (!p) {
5234                 status = nfserr_resource;
5235                 goto out;
5236         }
5237         *p = cpu_to_be32(eof);
5238
5239         cookie = offset + count;
5240
5241         write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &cookie, 8);
5242         tmp = cpu_to_be32(count);
5243         write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4);
5244 out:
5245         if (listxattrs->lsxa_len)
5246                 kvfree(listxattrs->lsxa_buf);
5247         return status;
5248 }
5249
5250 static __be32
5251 nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5252                          union nfsd4_op_u *u)
5253 {
5254         struct nfsd4_removexattr *removexattr = &u->removexattr;
5255         struct xdr_stream *xdr = resp->xdr;
5256         __be32 *p;
5257
5258         p = xdr_reserve_space(xdr, 20);
5259         if (!p)
5260                 return nfserr_resource;
5261
5262         p = encode_cinfo(p, &removexattr->rmxa_cinfo);
5263         return 0;
5264 }
5265
5266 typedef __be32(*nfsd4_enc)(struct nfsd4_compoundres *, __be32, union nfsd4_op_u *u);
5267
5268 /*
5269  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
5270  * since we don't need to filter out obsolete ops as this is
5271  * done in the decoding phase.
5272  */
5273 static const nfsd4_enc nfsd4_enc_ops[] = {
5274         [OP_ACCESS]             = nfsd4_encode_access,
5275         [OP_CLOSE]              = nfsd4_encode_close,
5276         [OP_COMMIT]             = nfsd4_encode_commit,
5277         [OP_CREATE]             = nfsd4_encode_create,
5278         [OP_DELEGPURGE]         = nfsd4_encode_noop,
5279         [OP_DELEGRETURN]        = nfsd4_encode_noop,
5280         [OP_GETATTR]            = nfsd4_encode_getattr,
5281         [OP_GETFH]              = nfsd4_encode_getfh,
5282         [OP_LINK]               = nfsd4_encode_link,
5283         [OP_LOCK]               = nfsd4_encode_lock,
5284         [OP_LOCKT]              = nfsd4_encode_lockt,
5285         [OP_LOCKU]              = nfsd4_encode_locku,
5286         [OP_LOOKUP]             = nfsd4_encode_noop,
5287         [OP_LOOKUPP]            = nfsd4_encode_noop,
5288         [OP_NVERIFY]            = nfsd4_encode_noop,
5289         [OP_OPEN]               = nfsd4_encode_open,
5290         [OP_OPENATTR]           = nfsd4_encode_noop,
5291         [OP_OPEN_CONFIRM]       = nfsd4_encode_open_confirm,
5292         [OP_OPEN_DOWNGRADE]     = nfsd4_encode_open_downgrade,
5293         [OP_PUTFH]              = nfsd4_encode_noop,
5294         [OP_PUTPUBFH]           = nfsd4_encode_noop,
5295         [OP_PUTROOTFH]          = nfsd4_encode_noop,
5296         [OP_READ]               = nfsd4_encode_read,
5297         [OP_READDIR]            = nfsd4_encode_readdir,
5298         [OP_READLINK]           = nfsd4_encode_readlink,
5299         [OP_REMOVE]             = nfsd4_encode_remove,
5300         [OP_RENAME]             = nfsd4_encode_rename,
5301         [OP_RENEW]              = nfsd4_encode_noop,
5302         [OP_RESTOREFH]          = nfsd4_encode_noop,
5303         [OP_SAVEFH]             = nfsd4_encode_noop,
5304         [OP_SECINFO]            = nfsd4_encode_secinfo,
5305         [OP_SETATTR]            = nfsd4_encode_setattr,
5306         [OP_SETCLIENTID]        = nfsd4_encode_setclientid,
5307         [OP_SETCLIENTID_CONFIRM] = nfsd4_encode_noop,
5308         [OP_VERIFY]             = nfsd4_encode_noop,
5309         [OP_WRITE]              = nfsd4_encode_write,
5310         [OP_RELEASE_LOCKOWNER]  = nfsd4_encode_noop,
5311
5312         /* NFSv4.1 operations */
5313         [OP_BACKCHANNEL_CTL]    = nfsd4_encode_noop,
5314         [OP_BIND_CONN_TO_SESSION] = nfsd4_encode_bind_conn_to_session,
5315         [OP_EXCHANGE_ID]        = nfsd4_encode_exchange_id,
5316         [OP_CREATE_SESSION]     = nfsd4_encode_create_session,
5317         [OP_DESTROY_SESSION]    = nfsd4_encode_noop,
5318         [OP_FREE_STATEID]       = nfsd4_encode_noop,
5319         [OP_GET_DIR_DELEGATION] = nfsd4_encode_noop,
5320 #ifdef CONFIG_NFSD_PNFS
5321         [OP_GETDEVICEINFO]      = nfsd4_encode_getdeviceinfo,
5322         [OP_GETDEVICELIST]      = nfsd4_encode_noop,
5323         [OP_LAYOUTCOMMIT]       = nfsd4_encode_layoutcommit,
5324         [OP_LAYOUTGET]          = nfsd4_encode_layoutget,
5325         [OP_LAYOUTRETURN]       = nfsd4_encode_layoutreturn,
5326 #else
5327         [OP_GETDEVICEINFO]      = nfsd4_encode_noop,
5328         [OP_GETDEVICELIST]      = nfsd4_encode_noop,
5329         [OP_LAYOUTCOMMIT]       = nfsd4_encode_noop,
5330         [OP_LAYOUTGET]          = nfsd4_encode_noop,
5331         [OP_LAYOUTRETURN]       = nfsd4_encode_noop,
5332 #endif
5333         [OP_SECINFO_NO_NAME]    = nfsd4_encode_secinfo_no_name,
5334         [OP_SEQUENCE]           = nfsd4_encode_sequence,
5335         [OP_SET_SSV]            = nfsd4_encode_noop,
5336         [OP_TEST_STATEID]       = nfsd4_encode_test_stateid,
5337         [OP_WANT_DELEGATION]    = nfsd4_encode_noop,
5338         [OP_DESTROY_CLIENTID]   = nfsd4_encode_noop,
5339         [OP_RECLAIM_COMPLETE]   = nfsd4_encode_noop,
5340
5341         /* NFSv4.2 operations */
5342         [OP_ALLOCATE]           = nfsd4_encode_noop,
5343         [OP_COPY]               = nfsd4_encode_copy,
5344         [OP_COPY_NOTIFY]        = nfsd4_encode_copy_notify,
5345         [OP_DEALLOCATE]         = nfsd4_encode_noop,
5346         [OP_IO_ADVISE]          = nfsd4_encode_noop,
5347         [OP_LAYOUTERROR]        = nfsd4_encode_noop,
5348         [OP_LAYOUTSTATS]        = nfsd4_encode_noop,
5349         [OP_OFFLOAD_CANCEL]     = nfsd4_encode_noop,
5350         [OP_OFFLOAD_STATUS]     = nfsd4_encode_offload_status,
5351         [OP_READ_PLUS]          = nfsd4_encode_read_plus,
5352         [OP_SEEK]               = nfsd4_encode_seek,
5353         [OP_WRITE_SAME]         = nfsd4_encode_noop,
5354         [OP_CLONE]              = nfsd4_encode_noop,
5355
5356         /* RFC 8276 extended atributes operations */
5357         [OP_GETXATTR]           = nfsd4_encode_getxattr,
5358         [OP_SETXATTR]           = nfsd4_encode_setxattr,
5359         [OP_LISTXATTRS]         = nfsd4_encode_listxattrs,
5360         [OP_REMOVEXATTR]        = nfsd4_encode_removexattr,
5361 };
5362
5363 /*
5364  * Calculate whether we still have space to encode repsize bytes.
5365  * There are two considerations:
5366  *     - For NFS versions >=4.1, the size of the reply must stay within
5367  *       session limits
5368  *     - For all NFS versions, we must stay within limited preallocated
5369  *       buffer space.
5370  *
5371  * This is called before the operation is processed, so can only provide
5372  * an upper estimate.  For some nonidempotent operations (such as
5373  * getattr), it's not necessarily a problem if that estimate is wrong,
5374  * as we can fail it after processing without significant side effects.
5375  */
5376 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
5377 {
5378         struct xdr_buf *buf = &resp->rqstp->rq_res;
5379         struct nfsd4_slot *slot = resp->cstate.slot;
5380
5381         if (buf->len + respsize <= buf->buflen)
5382                 return nfs_ok;
5383         if (!nfsd4_has_session(&resp->cstate))
5384                 return nfserr_resource;
5385         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
5386                 WARN_ON_ONCE(1);
5387                 return nfserr_rep_too_big_to_cache;
5388         }
5389         return nfserr_rep_too_big;
5390 }
5391
5392 void
5393 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
5394 {
5395         struct xdr_stream *xdr = resp->xdr;
5396         struct nfs4_stateowner *so = resp->cstate.replay_owner;
5397         struct svc_rqst *rqstp = resp->rqstp;
5398         const struct nfsd4_operation *opdesc = op->opdesc;
5399         int post_err_offset;
5400         nfsd4_enc encoder;
5401         __be32 *p;
5402
5403         p = xdr_reserve_space(xdr, 8);
5404         if (!p)
5405                 goto release;
5406         *p++ = cpu_to_be32(op->opnum);
5407         post_err_offset = xdr->buf->len;
5408
5409         if (op->opnum == OP_ILLEGAL)
5410                 goto status;
5411         if (op->status && opdesc &&
5412                         !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
5413                 goto status;
5414         BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
5415                !nfsd4_enc_ops[op->opnum]);
5416         encoder = nfsd4_enc_ops[op->opnum];
5417         op->status = encoder(resp, op->status, &op->u);
5418         if (op->status)
5419                 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status);
5420         xdr_commit_encode(xdr);
5421
5422         /* nfsd4_check_resp_size guarantees enough room for error status */
5423         if (!op->status) {
5424                 int space_needed = 0;
5425                 if (!nfsd4_last_compound_op(rqstp))
5426                         space_needed = COMPOUND_ERR_SLACK_SPACE;
5427                 op->status = nfsd4_check_resp_size(resp, space_needed);
5428         }
5429         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
5430                 struct nfsd4_slot *slot = resp->cstate.slot;
5431
5432                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
5433                         op->status = nfserr_rep_too_big_to_cache;
5434                 else
5435                         op->status = nfserr_rep_too_big;
5436         }
5437         if (op->status == nfserr_resource ||
5438             op->status == nfserr_rep_too_big ||
5439             op->status == nfserr_rep_too_big_to_cache) {
5440                 /*
5441                  * The operation may have already been encoded or
5442                  * partially encoded.  No op returns anything additional
5443                  * in the case of one of these three errors, so we can
5444                  * just truncate back to after the status.  But it's a
5445                  * bug if we had to do this on a non-idempotent op:
5446                  */
5447                 warn_on_nonidempotent_op(op);
5448                 xdr_truncate_encode(xdr, post_err_offset);
5449         }
5450         if (so) {
5451                 int len = xdr->buf->len - post_err_offset;
5452
5453                 so->so_replay.rp_status = op->status;
5454                 so->so_replay.rp_buflen = len;
5455                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
5456                                                 so->so_replay.rp_buf, len);
5457         }
5458 status:
5459         *p = op->status;
5460 release:
5461         if (opdesc && opdesc->op_release)
5462                 opdesc->op_release(&op->u);
5463 }
5464
5465 /*
5466  * Encode the reply stored in the stateowner reply cache
5467  *
5468  * XDR note: do not encode rp->rp_buflen: the buffer contains the
5469  * previously sent already encoded operation.
5470  */
5471 void
5472 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
5473 {
5474         __be32 *p;
5475         struct nfs4_replay *rp = op->replay;
5476
5477         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
5478         if (!p) {
5479                 WARN_ON_ONCE(1);
5480                 return;
5481         }
5482         *p++ = cpu_to_be32(op->opnum);
5483         *p++ = rp->rp_status;  /* already xdr'ed */
5484
5485         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
5486 }
5487
5488 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
5489 {
5490         struct nfsd4_compoundargs *args = rqstp->rq_argp;
5491
5492         if (args->ops != args->iops) {
5493                 vfree(args->ops);
5494                 args->ops = args->iops;
5495         }
5496         while (args->to_free) {
5497                 struct svcxdr_tmpbuf *tb = args->to_free;
5498                 args->to_free = tb->next;
5499                 kfree(tb);
5500         }
5501 }
5502
5503 bool
5504 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5505 {
5506         struct nfsd4_compoundargs *args = rqstp->rq_argp;
5507
5508         /* svcxdr_tmp_alloc */
5509         args->to_free = NULL;
5510
5511         args->xdr = xdr;
5512         args->ops = args->iops;
5513         args->rqstp = rqstp;
5514
5515         return nfsd4_decode_compound(args);
5516 }
5517
5518 bool
5519 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5520 {
5521         struct nfsd4_compoundres *resp = rqstp->rq_resp;
5522         __be32 *p;
5523
5524         /*
5525          * Send buffer space for the following items is reserved
5526          * at the top of nfsd4_proc_compound().
5527          */
5528         p = resp->statusp;
5529
5530         *p++ = resp->cstate.status;
5531
5532         rqstp->rq_next_page = xdr->page_ptr + 1;
5533
5534         *p++ = htonl(resp->taglen);
5535         memcpy(p, resp->tag, resp->taglen);
5536         p += XDR_QUADLEN(resp->taglen);
5537         *p++ = htonl(resp->opcnt);
5538
5539         nfsd4_sequence_done(resp);
5540         return true;
5541 }