kernel/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 <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   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/slab.h>
  37 #include <linux/namei.h>
  38 #include <linux/statfs.h>
  39 #include <linux/utsname.h>
  40 #include <linux/pagemap.h>
  41 #include <linux/sunrpc/svcauth_gss.h>
  42
  43 #include "idmap.h"
  44 #include "acl.h"
  45 #include "xdr4.h"
  46 #include "vfs.h"
  47 #include "state.h"
  48 #include "cache.h"
  49 #include "netns.h"
  50 #include "pnfs.h"
  51
  52 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  53 #include <linux/security.h>
  54 #endif
  55
  56
  57 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  58
  59 /*
  60  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  61  * directory in order to indicate to the client that a filesystem boundary is present
  62  * We use a fixed fsid for a referral
  63  */
  64 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  65 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  66
  67 static __be32
  68 check_filename(char *str, int len)
  69 {
  70         int i;
  71
  72         if (len == 0)
  73                 return nfserr_inval;
  74         if (isdotent(str, len))
  75                 return nfserr_badname;
  76         for (i = 0; i < len; i++)
  77                 if (str[i] == '/')
  78                         return nfserr_badname;
  79         return 0;
  80 }
  81
  82 #define DECODE_HEAD                             \
  83         __be32 *p;                              \
  84         __be32 status
  85 #define DECODE_TAIL                             \
  86         status = 0;                             \
  87 out:                                            \
  88         return status;                          \
  89 xdr_error:                                      \
  90         dprintk("NFSD: xdr error (%s:%d)\n",    \
  91                         __FILE__, __LINE__);    \
  92         status = nfserr_bad_xdr;                \
  93         goto out
  94
  95 #define READMEM(x,nbytes) do {                  \
  96         x = (char *)p;                          \
  97         p += XDR_QUADLEN(nbytes);               \
  98 } while (0)
  99 #define SAVEMEM(x,nbytes) do {                  \
 100         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 101                 savemem(argp, p, nbytes) :      \
 102                 (char *)p)) {                   \
 103                 dprintk("NFSD: xdr error (%s:%d)\n", \
 104                                 __FILE__, __LINE__); \
 105                 goto xdr_error;                 \
 106                 }                               \
 107         p += XDR_QUADLEN(nbytes);               \
 108 } while (0)
 109 #define COPYMEM(x,nbytes) do {                  \
 110         memcpy((x), p, nbytes);                 \
 111         p += XDR_QUADLEN(nbytes);               \
 112 } while (0)
 113
 114 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 115 #define READ_BUF(nbytes)  do {                  \
 116         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 117                 p = argp->p;                    \
 118                 argp->p += XDR_QUADLEN(nbytes); \
 119         } else if (!(p = read_buf(argp, nbytes))) { \
 120                 dprintk("NFSD: xdr error (%s:%d)\n", \
 121                                 __FILE__, __LINE__); \
 122                 goto xdr_error;                 \
 123         }                                       \
 124 } while (0)
 125
 126 static void next_decode_page(struct nfsd4_compoundargs *argp)
 127 {
 128         argp->p = page_address(argp->pagelist[0]);
 129         argp->pagelist++;
 130         if (argp->pagelen < PAGE_SIZE) {
 131                 argp->end = argp->p + (argp->pagelen>>2);
 132                 argp->pagelen = 0;
 133         } else {
 134                 argp->end = argp->p + (PAGE_SIZE>>2);
 135                 argp->pagelen -= PAGE_SIZE;
 136         }
 137 }
 138
 139 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 140 {
 141         /* We want more bytes than seem to be available.
 142          * Maybe we need a new page, maybe we have just run out
 143          */
 144         unsigned int avail = (char *)argp->end - (char *)argp->p;
 145         __be32 *p;
 146         if (avail + argp->pagelen < nbytes)
 147                 return NULL;
 148         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 149                 return NULL;
 150         /* ok, we can do it with the current plus the next page */
 151         if (nbytes <= sizeof(argp->tmp))
 152                 p = argp->tmp;
 153         else {
 154                 kfree(argp->tmpp);
 155                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 156                 if (!p)
 157                         return NULL;
 158
 159         }
 160         /*
 161          * The following memcpy is safe because read_buf is always
 162          * called with nbytes > avail, and the two cases above both
 163          * guarantee p points to at least nbytes bytes.
 164          */
 165         memcpy(p, argp->p, avail);
 166         next_decode_page(argp);
 167         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 168         argp->p += XDR_QUADLEN(nbytes - avail);
 169         return p;
 170 }
 171
 172 static int zero_clientid(clientid_t *clid)
 173 {
 174         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 175 }
 176
 177 /**
 178  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 179  * @argp: NFSv4 compound argument structure
 180  * @p: pointer to be freed (with kfree())
 181  *
 182  * Marks @p to be freed when processing the compound operation
 183  * described in @argp finishes.
 184  */
 185 static void *
 186 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 187 {
 188         struct svcxdr_tmpbuf *tb;
 189
 190         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 191         if (!tb)
 192                 return NULL;
 193         tb->next = argp->to_free;
 194         argp->to_free = tb;
 195         return tb->buf;
 196 }
 197
 198 /*
 199  * For xdr strings that need to be passed to other kernel api's
 200  * as null-terminated strings.
 201  *
 202  * Note null-terminating in place usually isn't safe since the
 203  * buffer might end on a page boundary.
 204  */
 205 static char *
 206 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 207 {
 208         char *p = svcxdr_tmpalloc(argp, len + 1);
 209
 210         if (!p)
 211                 return NULL;
 212         memcpy(p, buf, len);
 213         p[len] = '\0';
 214         return p;
 215 }
 216
 217 /**
 218  * savemem - duplicate a chunk of memory for later processing
 219  * @argp: NFSv4 compound argument structure to be freed with
 220  * @p: pointer to be duplicated
 221  * @nbytes: length to be duplicated
 222  *
 223  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 224  * that are preserved until processing of the NFSv4 compound
 225  * operation described by @argp finishes.
 226  */
 227 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 228 {
 229         void *ret;
 230
 231         ret = svcxdr_tmpalloc(argp, nbytes);
 232         if (!ret)
 233                 return NULL;
 234         memcpy(ret, p, nbytes);
 235         return ret;
 236 }
 237
 238 /*
 239  * We require the high 32 bits of 'seconds' to be 0, and
 240  * we ignore all 32 bits of 'nseconds'.
 241  */
 242 static __be32
 243 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
 244 {
 245         DECODE_HEAD;
 246         u64 sec;
 247
 248         READ_BUF(12);
 249         p = xdr_decode_hyper(p, &sec);
 250         tv->tv_sec = sec;
 251         tv->tv_nsec = be32_to_cpup(p++);
 252         if (tv->tv_nsec >= (u32)1000000000)
 253                 return nfserr_inval;
 254
 255         DECODE_TAIL;
 256 }
 257
 258 static __be32
 259 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 260 {
 261         u32 bmlen;
 262         DECODE_HEAD;
 263
 264         bmval[0] = 0;
 265         bmval[1] = 0;
 266         bmval[2] = 0;
 267
 268         READ_BUF(4);
 269         bmlen = be32_to_cpup(p++);
 270         if (bmlen > 1000)
 271                 goto xdr_error;
 272
 273         READ_BUF(bmlen << 2);
 274         if (bmlen > 0)
 275                 bmval[0] = be32_to_cpup(p++);
 276         if (bmlen > 1)
 277                 bmval[1] = be32_to_cpup(p++);
 278         if (bmlen > 2)
 279                 bmval[2] = be32_to_cpup(p++);
 280
 281         DECODE_TAIL;
 282 }
 283
 284 static __be32
 285 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 286                    struct iattr *iattr, struct nfs4_acl **acl,
 287                    struct xdr_netobj *label)
 288 {
 289         int expected_len, len = 0;
 290         u32 dummy32;
 291         char *buf;
 292
 293         DECODE_HEAD;
 294         iattr->ia_valid = 0;
 295         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 296                 return status;
 297
 298         READ_BUF(4);
 299         expected_len = be32_to_cpup(p++);
 300
 301         if (bmval[0] & FATTR4_WORD0_SIZE) {
 302                 READ_BUF(8);
 303                 len += 8;
 304                 p = xdr_decode_hyper(p, &iattr->ia_size);
 305                 iattr->ia_valid |= ATTR_SIZE;
 306         }
 307         if (bmval[0] & FATTR4_WORD0_ACL) {
 308                 u32 nace;
 309                 struct nfs4_ace *ace;
 310
 311                 READ_BUF(4); len += 4;
 312                 nace = be32_to_cpup(p++);
 313
 314                 if (nace > NFS4_ACL_MAX)
 315                         return nfserr_fbig;
 316
 317                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
 318                 if (*acl == NULL)
 319                         return nfserr_jukebox;
 320
 321                 (*acl)->naces = nace;
 322                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 323                         READ_BUF(16); len += 16;
 324                         ace->type = be32_to_cpup(p++);
 325                         ace->flag = be32_to_cpup(p++);
 326                         ace->access_mask = be32_to_cpup(p++);
 327                         dummy32 = be32_to_cpup(p++);
 328                         READ_BUF(dummy32);
 329                         len += XDR_QUADLEN(dummy32) << 2;
 330                         READMEM(buf, dummy32);
 331                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 332                         status = nfs_ok;
 333                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 334                                 ;
 335                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 336                                 status = nfsd_map_name_to_gid(argp->rqstp,
 337                                                 buf, dummy32, &ace->who_gid);
 338                         else
 339                                 status = nfsd_map_name_to_uid(argp->rqstp,
 340                                                 buf, dummy32, &ace->who_uid);
 341                         if (status)
 342                                 return status;
 343                 }
 344         } else
 345                 *acl = NULL;
 346         if (bmval[1] & FATTR4_WORD1_MODE) {
 347                 READ_BUF(4);
 348                 len += 4;
 349                 iattr->ia_mode = be32_to_cpup(p++);
 350                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 351                 iattr->ia_valid |= ATTR_MODE;
 352         }
 353         if (bmval[1] & FATTR4_WORD1_OWNER) {
 354                 READ_BUF(4);
 355                 len += 4;
 356                 dummy32 = be32_to_cpup(p++);
 357                 READ_BUF(dummy32);
 358                 len += (XDR_QUADLEN(dummy32) << 2);
 359                 READMEM(buf, dummy32);
 360                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 361                         return status;
 362                 iattr->ia_valid |= ATTR_UID;
 363         }
 364         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 365                 READ_BUF(4);
 366                 len += 4;
 367                 dummy32 = be32_to_cpup(p++);
 368                 READ_BUF(dummy32);
 369                 len += (XDR_QUADLEN(dummy32) << 2);
 370                 READMEM(buf, dummy32);
 371                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 372                         return status;
 373                 iattr->ia_valid |= ATTR_GID;
 374         }
 375         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 376                 READ_BUF(4);
 377                 len += 4;
 378                 dummy32 = be32_to_cpup(p++);
 379                 switch (dummy32) {
 380                 case NFS4_SET_TO_CLIENT_TIME:
 381                         len += 12;
 382                         status = nfsd4_decode_time(argp, &iattr->ia_atime);
 383                         if (status)
 384                                 return status;
 385                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 386                         break;
 387                 case NFS4_SET_TO_SERVER_TIME:
 388                         iattr->ia_valid |= ATTR_ATIME;
 389                         break;
 390                 default:
 391                         goto xdr_error;
 392                 }
 393         }
 394         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 395                 READ_BUF(4);
 396                 len += 4;
 397                 dummy32 = be32_to_cpup(p++);
 398                 switch (dummy32) {
 399                 case NFS4_SET_TO_CLIENT_TIME:
 400                         len += 12;
 401                         status = nfsd4_decode_time(argp, &iattr->ia_mtime);
 402                         if (status)
 403                                 return status;
 404                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 405                         break;
 406                 case NFS4_SET_TO_SERVER_TIME:
 407                         iattr->ia_valid |= ATTR_MTIME;
 408                         break;
 409                 default:
 410                         goto xdr_error;
 411                 }
 412         }
 413
 414         label->len = 0;
 415 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 416         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 417                 READ_BUF(4);
 418                 len += 4;
 419                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 420                 READ_BUF(4);
 421                 len += 4;
 422                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 423                 READ_BUF(4);
 424                 len += 4;
 425                 dummy32 = be32_to_cpup(p++);
 426                 READ_BUF(dummy32);
 427                 if (dummy32 > NFS4_MAXLABELLEN)
 428                         return nfserr_badlabel;
 429                 len += (XDR_QUADLEN(dummy32) << 2);
 430                 READMEM(buf, dummy32);
 431                 label->len = dummy32;
 432                 label->data = svcxdr_dupstr(argp, buf, dummy32);
 433                 if (!label->data)
 434                         return nfserr_jukebox;
 435         }
 436 #endif
 437
 438         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 439             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 440             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 441                 READ_BUF(expected_len - len);
 442         else if (len != expected_len)
 443                 goto xdr_error;
 444
 445         DECODE_TAIL;
 446 }
 447
 448 static __be32
 449 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 450 {
 451         DECODE_HEAD;
 452
 453         READ_BUF(sizeof(stateid_t));
 454         sid->si_generation = be32_to_cpup(p++);
 455         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 456
 457         DECODE_TAIL;
 458 }
 459
 460 static __be32
 461 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 462 {
 463         DECODE_HEAD;
 464
 465         READ_BUF(4);
 466         access->ac_req_access = be32_to_cpup(p++);
 467
 468         DECODE_TAIL;
 469 }
 470
 471 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 472 {
 473         DECODE_HEAD;
 474         u32 dummy, uid, gid;
 475         char *machine_name;
 476         int i;
 477         int nr_secflavs;
 478
 479         /* callback_sec_params4 */
 480         READ_BUF(4);
 481         nr_secflavs = be32_to_cpup(p++);
 482         if (nr_secflavs)
 483                 cbs->flavor = (u32)(-1);
 484         else
 485                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 486                 cbs->flavor = 0;
 487         for (i = 0; i < nr_secflavs; ++i) {
 488                 READ_BUF(4);
 489                 dummy = be32_to_cpup(p++);
 490                 switch (dummy) {
 491                 case RPC_AUTH_NULL:
 492                         /* Nothing to read */
 493                         if (cbs->flavor == (u32)(-1))
 494                                 cbs->flavor = RPC_AUTH_NULL;
 495                         break;
 496                 case RPC_AUTH_UNIX:
 497                         READ_BUF(8);
 498                         /* stamp */
 499                         dummy = be32_to_cpup(p++);
 500
 501                         /* machine name */
 502                         dummy = be32_to_cpup(p++);
 503                         READ_BUF(dummy);
 504                         SAVEMEM(machine_name, dummy);
 505
 506                         /* uid, gid */
 507                         READ_BUF(8);
 508                         uid = be32_to_cpup(p++);
 509                         gid = be32_to_cpup(p++);
 510
 511                         /* more gids */
 512                         READ_BUF(4);
 513                         dummy = be32_to_cpup(p++);
 514                         READ_BUF(dummy * 4);
 515                         if (cbs->flavor == (u32)(-1)) {
 516                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 517                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 518                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 519                                         cbs->uid = kuid;
 520                                         cbs->gid = kgid;
 521                                         cbs->flavor = RPC_AUTH_UNIX;
 522                                 } else {
 523                                         dprintk("RPC_AUTH_UNIX with invalid"
 524                                                 "uid or gid ignoring!\n");
 525                                 }
 526                         }
 527                         break;
 528                 case RPC_AUTH_GSS:
 529                         dprintk("RPC_AUTH_GSS callback secflavor "
 530                                 "not supported!\n");
 531                         READ_BUF(8);
 532                         /* gcbp_service */
 533                         dummy = be32_to_cpup(p++);
 534                         /* gcbp_handle_from_server */
 535                         dummy = be32_to_cpup(p++);
 536                         READ_BUF(dummy);
 537                         p += XDR_QUADLEN(dummy);
 538                         /* gcbp_handle_from_client */
 539                         READ_BUF(4);
 540                         dummy = be32_to_cpup(p++);
 541                         READ_BUF(dummy);
 542                         break;
 543                 default:
 544                         dprintk("Illegal callback secflavor\n");
 545                         return nfserr_inval;
 546                 }
 547         }
 548         DECODE_TAIL;
 549 }
 550
 551 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 552 {
 553         DECODE_HEAD;
 554
 555         READ_BUF(4);
 556         bc->bc_cb_program = be32_to_cpup(p++);
 557         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 558
 559         DECODE_TAIL;
 560 }
 561
 562 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 563 {
 564         DECODE_HEAD;
 565
 566         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 567         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 568         bcts->dir = be32_to_cpup(p++);
 569         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 570          * could help us figure out we should be using it. */
 571         DECODE_TAIL;
 572 }
 573
 574 static __be32
 575 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 576 {
 577         DECODE_HEAD;
 578
 579         READ_BUF(4);
 580         close->cl_seqid = be32_to_cpup(p++);
 581         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 582
 583         DECODE_TAIL;
 584 }
 585
 586
 587 static __be32
 588 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 589 {
 590         DECODE_HEAD;
 591
 592         READ_BUF(12);
 593         p = xdr_decode_hyper(p, &commit->co_offset);
 594         commit->co_count = be32_to_cpup(p++);
 595
 596         DECODE_TAIL;
 597 }
 598
 599 static __be32
 600 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 601 {
 602         DECODE_HEAD;
 603
 604         READ_BUF(4);
 605         create->cr_type = be32_to_cpup(p++);
 606         switch (create->cr_type) {
 607         case NF4LNK:
 608                 READ_BUF(4);
 609                 create->cr_datalen = be32_to_cpup(p++);
 610                 READ_BUF(create->cr_datalen);
 611                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 612                 if (!create->cr_data)
 613                         return nfserr_jukebox;
 614                 break;
 615         case NF4BLK:
 616         case NF4CHR:
 617                 READ_BUF(8);
 618                 create->cr_specdata1 = be32_to_cpup(p++);
 619                 create->cr_specdata2 = be32_to_cpup(p++);
 620                 break;
 621         case NF4SOCK:
 622         case NF4FIFO:
 623         case NF4DIR:
 624         default:
 625                 break;
 626         }
 627
 628         READ_BUF(4);
 629         create->cr_namelen = be32_to_cpup(p++);
 630         READ_BUF(create->cr_namelen);
 631         SAVEMEM(create->cr_name, create->cr_namelen);
 632         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 633                 return status;
 634
 635         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 636                                     &create->cr_acl, &create->cr_label);
 637         if (status)
 638                 goto out;
 639
 640         DECODE_TAIL;
 641 }
 642
 643 static inline __be32
 644 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 645 {
 646         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 647 }
 648
 649 static inline __be32
 650 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 651 {
 652         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 653 }
 654
 655 static __be32
 656 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 657 {
 658         DECODE_HEAD;
 659
 660         READ_BUF(4);
 661         link->li_namelen = be32_to_cpup(p++);
 662         READ_BUF(link->li_namelen);
 663         SAVEMEM(link->li_name, link->li_namelen);
 664         if ((status = check_filename(link->li_name, link->li_namelen)))
 665                 return status;
 666
 667         DECODE_TAIL;
 668 }
 669
 670 static __be32
 671 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 672 {
 673         DECODE_HEAD;
 674
 675         /*
 676         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 677         */
 678         READ_BUF(28);
 679         lock->lk_type = be32_to_cpup(p++);
 680         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 681                 goto xdr_error;
 682         lock->lk_reclaim = be32_to_cpup(p++);
 683         p = xdr_decode_hyper(p, &lock->lk_offset);
 684         p = xdr_decode_hyper(p, &lock->lk_length);
 685         lock->lk_is_new = be32_to_cpup(p++);
 686
 687         if (lock->lk_is_new) {
 688                 READ_BUF(4);
 689                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 690                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 691                 if (status)
 692                         return status;
 693                 READ_BUF(8 + sizeof(clientid_t));
 694                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 695                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 696                 lock->lk_new_owner.len = be32_to_cpup(p++);
 697                 READ_BUF(lock->lk_new_owner.len);
 698                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 699         } else {
 700                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 701                 if (status)
 702                         return status;
 703                 READ_BUF(4);
 704                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 705         }
 706
 707         DECODE_TAIL;
 708 }
 709
 710 static __be32
 711 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 712 {
 713         DECODE_HEAD;
 714
 715         READ_BUF(32);
 716         lockt->lt_type = be32_to_cpup(p++);
 717         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 718                 goto xdr_error;
 719         p = xdr_decode_hyper(p, &lockt->lt_offset);
 720         p = xdr_decode_hyper(p, &lockt->lt_length);
 721         COPYMEM(&lockt->lt_clientid, 8);
 722         lockt->lt_owner.len = be32_to_cpup(p++);
 723         READ_BUF(lockt->lt_owner.len);
 724         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 725
 726         DECODE_TAIL;
 727 }
 728
 729 static __be32
 730 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 731 {
 732         DECODE_HEAD;
 733
 734         READ_BUF(8);
 735         locku->lu_type = be32_to_cpup(p++);
 736         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 737                 goto xdr_error;
 738         locku->lu_seqid = be32_to_cpup(p++);
 739         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 740         if (status)
 741                 return status;
 742         READ_BUF(16);
 743         p = xdr_decode_hyper(p, &locku->lu_offset);
 744         p = xdr_decode_hyper(p, &locku->lu_length);
 745
 746         DECODE_TAIL;
 747 }
 748
 749 static __be32
 750 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 751 {
 752         DECODE_HEAD;
 753
 754         READ_BUF(4);
 755         lookup->lo_len = be32_to_cpup(p++);
 756         READ_BUF(lookup->lo_len);
 757         SAVEMEM(lookup->lo_name, lookup->lo_len);
 758         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 759                 return status;
 760
 761         DECODE_TAIL;
 762 }
 763
 764 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 765 {
 766         __be32 *p;
 767         u32 w;
 768
 769         READ_BUF(4);
 770         w = be32_to_cpup(p++);
 771         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 772         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 773         if (deleg_when)
 774                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 775
 776         switch (w & NFS4_SHARE_ACCESS_MASK) {
 777         case NFS4_SHARE_ACCESS_READ:
 778         case NFS4_SHARE_ACCESS_WRITE:
 779         case NFS4_SHARE_ACCESS_BOTH:
 780                 break;
 781         default:
 782                 return nfserr_bad_xdr;
 783         }
 784         w &= ~NFS4_SHARE_ACCESS_MASK;
 785         if (!w)
 786                 return nfs_ok;
 787         if (!argp->minorversion)
 788                 return nfserr_bad_xdr;
 789         switch (w & NFS4_SHARE_WANT_MASK) {
 790         case NFS4_SHARE_WANT_NO_PREFERENCE:
 791         case NFS4_SHARE_WANT_READ_DELEG:
 792         case NFS4_SHARE_WANT_WRITE_DELEG:
 793         case NFS4_SHARE_WANT_ANY_DELEG:
 794         case NFS4_SHARE_WANT_NO_DELEG:
 795         case NFS4_SHARE_WANT_CANCEL:
 796                 break;
 797         default:
 798                 return nfserr_bad_xdr;
 799         }
 800         w &= ~NFS4_SHARE_WANT_MASK;
 801         if (!w)
 802                 return nfs_ok;
 803
 804         if (!deleg_when)        /* open_downgrade */
 805                 return nfserr_inval;
 806         switch (w) {
 807         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 808         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 809         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 810               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 811                 return nfs_ok;
 812         }
 813 xdr_error:
 814         return nfserr_bad_xdr;
 815 }
 816
 817 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 818 {
 819         __be32 *p;
 820
 821         READ_BUF(4);
 822         *x = be32_to_cpup(p++);
 823         /* Note: unlinke access bits, deny bits may be zero. */
 824         if (*x & ~NFS4_SHARE_DENY_BOTH)
 825                 return nfserr_bad_xdr;
 826         return nfs_ok;
 827 xdr_error:
 828         return nfserr_bad_xdr;
 829 }
 830
 831 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 832 {
 833         __be32 *p;
 834
 835         READ_BUF(4);
 836         o->len = be32_to_cpup(p++);
 837
 838         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 839                 return nfserr_bad_xdr;
 840
 841         READ_BUF(o->len);
 842         SAVEMEM(o->data, o->len);
 843         return nfs_ok;
 844 xdr_error:
 845         return nfserr_bad_xdr;
 846 }
 847
 848 static __be32
 849 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 850 {
 851         DECODE_HEAD;
 852         u32 dummy;
 853
 854         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 855         open->op_iattr.ia_valid = 0;
 856         open->op_openowner = NULL;
 857
 858         open->op_xdr_error = 0;
 859         /* seqid, share_access, share_deny, clientid, ownerlen */
 860         READ_BUF(4);
 861         open->op_seqid = be32_to_cpup(p++);
 862         /* decode, yet ignore deleg_when until supported */
 863         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 864                                            &open->op_deleg_want, &dummy);
 865         if (status)
 866                 goto xdr_error;
 867         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 868         if (status)
 869                 goto xdr_error;
 870         READ_BUF(sizeof(clientid_t));
 871         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 872         status = nfsd4_decode_opaque(argp, &open->op_owner);
 873         if (status)
 874                 goto xdr_error;
 875         READ_BUF(4);
 876         open->op_create = be32_to_cpup(p++);
 877         switch (open->op_create) {
 878         case NFS4_OPEN_NOCREATE:
 879                 break;
 880         case NFS4_OPEN_CREATE:
 881                 READ_BUF(4);
 882                 open->op_createmode = be32_to_cpup(p++);
 883                 switch (open->op_createmode) {
 884                 case NFS4_CREATE_UNCHECKED:
 885                 case NFS4_CREATE_GUARDED:
 886                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 887                                 &open->op_iattr, &open->op_acl, &open->op_label);
 888                         if (status)
 889                                 goto out;
 890                         break;
 891                 case NFS4_CREATE_EXCLUSIVE:
 892                         READ_BUF(NFS4_VERIFIER_SIZE);
 893                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 894                         break;
 895                 case NFS4_CREATE_EXCLUSIVE4_1:
 896                         if (argp->minorversion < 1)
 897                                 goto xdr_error;
 898                         READ_BUF(NFS4_VERIFIER_SIZE);
 899                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 900                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 901                                 &open->op_iattr, &open->op_acl, &open->op_label);
 902                         if (status)
 903                                 goto out;
 904                         break;
 905                 default:
 906                         goto xdr_error;
 907                 }
 908                 break;
 909         default:
 910                 goto xdr_error;
 911         }
 912
 913         /* open_claim */
 914         READ_BUF(4);
 915         open->op_claim_type = be32_to_cpup(p++);
 916         switch (open->op_claim_type) {
 917         case NFS4_OPEN_CLAIM_NULL:
 918         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 919                 READ_BUF(4);
 920                 open->op_fname.len = be32_to_cpup(p++);
 921                 READ_BUF(open->op_fname.len);
 922                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 923                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 924                         return status;
 925                 break;
 926         case NFS4_OPEN_CLAIM_PREVIOUS:
 927                 READ_BUF(4);
 928                 open->op_delegate_type = be32_to_cpup(p++);
 929                 break;
 930         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 931                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 932                 if (status)
 933                         return status;
 934                 READ_BUF(4);
 935                 open->op_fname.len = be32_to_cpup(p++);
 936                 READ_BUF(open->op_fname.len);
 937                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 938                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 939                         return status;
 940                 break;
 941         case NFS4_OPEN_CLAIM_FH:
 942         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 943                 if (argp->minorversion < 1)
 944                         goto xdr_error;
 945                 /* void */
 946                 break;
 947         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 948                 if (argp->minorversion < 1)
 949                         goto xdr_error;
 950                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 951                 if (status)
 952                         return status;
 953                 break;
 954         default:
 955                 goto xdr_error;
 956         }
 957
 958         DECODE_TAIL;
 959 }
 960
 961 static __be32
 962 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 963 {
 964         DECODE_HEAD;
 965
 966         if (argp->minorversion >= 1)
 967                 return nfserr_notsupp;
 968
 969         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 970         if (status)
 971                 return status;
 972         READ_BUF(4);
 973         open_conf->oc_seqid = be32_to_cpup(p++);
 974
 975         DECODE_TAIL;
 976 }
 977
 978 static __be32
 979 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 980 {
 981         DECODE_HEAD;
 982
 983         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 984         if (status)
 985                 return status;
 986         READ_BUF(4);
 987         open_down->od_seqid = be32_to_cpup(p++);
 988         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 989                                            &open_down->od_deleg_want, NULL);
 990         if (status)
 991                 return status;
 992         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 993         if (status)
 994                 return status;
 995         DECODE_TAIL;
 996 }
 997
 998 static __be32
 999 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1000 {
1001         DECODE_HEAD;
1002
1003         READ_BUF(4);
1004         putfh->pf_fhlen = be32_to_cpup(p++);
1005         if (putfh->pf_fhlen > NFS4_FHSIZE)
1006                 goto xdr_error;
1007         READ_BUF(putfh->pf_fhlen);
1008         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1009
1010         DECODE_TAIL;
1011 }
1012
1013 static __be32
1014 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1015 {
1016         if (argp->minorversion == 0)
1017                 return nfs_ok;
1018         return nfserr_notsupp;
1019 }
1020
1021 static __be32
1022 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1023 {
1024         DECODE_HEAD;
1025
1026         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1027         if (status)
1028                 return status;
1029         READ_BUF(12);
1030         p = xdr_decode_hyper(p, &read->rd_offset);
1031         read->rd_length = be32_to_cpup(p++);
1032
1033         DECODE_TAIL;
1034 }
1035
1036 static __be32
1037 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1038 {
1039         DECODE_HEAD;
1040
1041         READ_BUF(24);
1042         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1043         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1044         readdir->rd_dircount = be32_to_cpup(p++);
1045         readdir->rd_maxcount = be32_to_cpup(p++);
1046         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1047                 goto out;
1048
1049         DECODE_TAIL;
1050 }
1051
1052 static __be32
1053 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1054 {
1055         DECODE_HEAD;
1056
1057         READ_BUF(4);
1058         remove->rm_namelen = be32_to_cpup(p++);
1059         READ_BUF(remove->rm_namelen);
1060         SAVEMEM(remove->rm_name, remove->rm_namelen);
1061         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1062                 return status;
1063
1064         DECODE_TAIL;
1065 }
1066
1067 static __be32
1068 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1069 {
1070         DECODE_HEAD;
1071
1072         READ_BUF(4);
1073         rename->rn_snamelen = be32_to_cpup(p++);
1074         READ_BUF(rename->rn_snamelen + 4);
1075         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1076         rename->rn_tnamelen = be32_to_cpup(p++);
1077         READ_BUF(rename->rn_tnamelen);
1078         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1079         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1080                 return status;
1081         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1082                 return status;
1083
1084         DECODE_TAIL;
1085 }
1086
1087 static __be32
1088 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1089 {
1090         DECODE_HEAD;
1091
1092         if (argp->minorversion >= 1)
1093                 return nfserr_notsupp;
1094
1095         READ_BUF(sizeof(clientid_t));
1096         COPYMEM(clientid, sizeof(clientid_t));
1097
1098         DECODE_TAIL;
1099 }
1100
1101 static __be32
1102 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1103                      struct nfsd4_secinfo *secinfo)
1104 {
1105         DECODE_HEAD;
1106
1107         READ_BUF(4);
1108         secinfo->si_namelen = be32_to_cpup(p++);
1109         READ_BUF(secinfo->si_namelen);
1110         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1111         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1112         if (status)
1113                 return status;
1114         DECODE_TAIL;
1115 }
1116
1117 static __be32
1118 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1119                      struct nfsd4_secinfo_no_name *sin)
1120 {
1121         DECODE_HEAD;
1122
1123         READ_BUF(4);
1124         sin->sin_style = be32_to_cpup(p++);
1125         DECODE_TAIL;
1126 }
1127
1128 static __be32
1129 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1130 {
1131         __be32 status;
1132
1133         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1134         if (status)
1135                 return status;
1136         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1137                                   &setattr->sa_acl, &setattr->sa_label);
1138 }
1139
1140 static __be32
1141 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1142 {
1143         DECODE_HEAD;
1144
1145         if (argp->minorversion >= 1)
1146                 return nfserr_notsupp;
1147
1148         READ_BUF(NFS4_VERIFIER_SIZE);
1149         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1150
1151         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1152         if (status)
1153                 return nfserr_bad_xdr;
1154         READ_BUF(8);
1155         setclientid->se_callback_prog = be32_to_cpup(p++);
1156         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1157
1158         READ_BUF(setclientid->se_callback_netid_len + 4);
1159         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1160         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1161
1162         READ_BUF(setclientid->se_callback_addr_len + 4);
1163         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1164         setclientid->se_callback_ident = be32_to_cpup(p++);
1165
1166         DECODE_TAIL;
1167 }
1168
1169 static __be32
1170 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1171 {
1172         DECODE_HEAD;
1173
1174         if (argp->minorversion >= 1)
1175                 return nfserr_notsupp;
1176
1177         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1178         COPYMEM(&scd_c->sc_clientid, 8);
1179         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1180
1181         DECODE_TAIL;
1182 }
1183
1184 /* Also used for NVERIFY */
1185 static __be32
1186 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1187 {
1188         DECODE_HEAD;
1189
1190         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1191                 goto out;
1192
1193         /* For convenience's sake, we compare raw xdr'd attributes in
1194          * nfsd4_proc_verify */
1195
1196         READ_BUF(4);
1197         verify->ve_attrlen = be32_to_cpup(p++);
1198         READ_BUF(verify->ve_attrlen);
1199         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1200
1201         DECODE_TAIL;
1202 }
1203
1204 static __be32
1205 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1206 {
1207         int avail;
1208         int len;
1209         DECODE_HEAD;
1210
1211         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1212         if (status)
1213                 return status;
1214         READ_BUF(16);
1215         p = xdr_decode_hyper(p, &write->wr_offset);
1216         write->wr_stable_how = be32_to_cpup(p++);
1217         if (write->wr_stable_how > 2)
1218                 goto xdr_error;
1219         write->wr_buflen = be32_to_cpup(p++);
1220
1221         /* Sorry .. no magic macros for this.. *
1222          * READ_BUF(write->wr_buflen);
1223          * SAVEMEM(write->wr_buf, write->wr_buflen);
1224          */
1225         avail = (char*)argp->end - (char*)argp->p;
1226         if (avail + argp->pagelen < write->wr_buflen) {
1227                 dprintk("NFSD: xdr error (%s:%d)\n",
1228                                 __FILE__, __LINE__);
1229                 goto xdr_error;
1230         }
1231         write->wr_head.iov_base = p;
1232         write->wr_head.iov_len = avail;
1233         write->wr_pagelist = argp->pagelist;
1234
1235         len = XDR_QUADLEN(write->wr_buflen) << 2;
1236         if (len >= avail) {
1237                 int pages;
1238
1239                 len -= avail;
1240
1241                 pages = len >> PAGE_SHIFT;
1242                 argp->pagelist += pages;
1243                 argp->pagelen -= pages * PAGE_SIZE;
1244                 len -= pages * PAGE_SIZE;
1245
1246                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1247                 argp->pagelist++;
1248                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1249         }
1250         argp->p += XDR_QUADLEN(len);
1251
1252         DECODE_TAIL;
1253 }
1254
1255 static __be32
1256 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1257 {
1258         DECODE_HEAD;
1259
1260         if (argp->minorversion >= 1)
1261                 return nfserr_notsupp;
1262
1263         READ_BUF(12);
1264         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1265         rlockowner->rl_owner.len = be32_to_cpup(p++);
1266         READ_BUF(rlockowner->rl_owner.len);
1267         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1268
1269         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1270                 return nfserr_inval;
1271         DECODE_TAIL;
1272 }
1273
1274 static __be32
1275 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1276                          struct nfsd4_exchange_id *exid)
1277 {
1278         int dummy, tmp;
1279         DECODE_HEAD;
1280
1281         READ_BUF(NFS4_VERIFIER_SIZE);
1282         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1283
1284         status = nfsd4_decode_opaque(argp, &exid->clname);
1285         if (status)
1286                 return nfserr_bad_xdr;
1287
1288         READ_BUF(4);
1289         exid->flags = be32_to_cpup(p++);
1290
1291         /* Ignore state_protect4_a */
1292         READ_BUF(4);
1293         exid->spa_how = be32_to_cpup(p++);
1294         switch (exid->spa_how) {
1295         case SP4_NONE:
1296                 break;
1297         case SP4_MACH_CRED:
1298                 /* spo_must_enforce */
1299                 READ_BUF(4);
1300                 dummy = be32_to_cpup(p++);
1301                 READ_BUF(dummy * 4);
1302                 p += dummy;
1303
1304                 /* spo_must_allow */
1305                 READ_BUF(4);
1306                 dummy = be32_to_cpup(p++);
1307                 READ_BUF(dummy * 4);
1308                 p += dummy;
1309                 break;
1310         case SP4_SSV:
1311                 /* ssp_ops */
1312                 READ_BUF(4);
1313                 dummy = be32_to_cpup(p++);
1314                 READ_BUF(dummy * 4);
1315                 p += dummy;
1316
1317                 READ_BUF(4);
1318                 dummy = be32_to_cpup(p++);
1319                 READ_BUF(dummy * 4);
1320                 p += dummy;
1321
1322                 /* ssp_hash_algs<> */
1323                 READ_BUF(4);
1324                 tmp = be32_to_cpup(p++);
1325                 while (tmp--) {
1326                         READ_BUF(4);
1327                         dummy = be32_to_cpup(p++);
1328                         READ_BUF(dummy);
1329                         p += XDR_QUADLEN(dummy);
1330                 }
1331
1332                 /* ssp_encr_algs<> */
1333                 READ_BUF(4);
1334                 tmp = be32_to_cpup(p++);
1335                 while (tmp--) {
1336                         READ_BUF(4);
1337                         dummy = be32_to_cpup(p++);
1338                         READ_BUF(dummy);
1339                         p += XDR_QUADLEN(dummy);
1340                 }
1341
1342                 /* ssp_window and ssp_num_gss_handles */
1343                 READ_BUF(8);
1344                 dummy = be32_to_cpup(p++);
1345                 dummy = be32_to_cpup(p++);
1346                 break;
1347         default:
1348                 goto xdr_error;
1349         }
1350
1351         /* Ignore Implementation ID */
1352         READ_BUF(4);    /* nfs_impl_id4 array length */
1353         dummy = be32_to_cpup(p++);
1354
1355         if (dummy > 1)
1356                 goto xdr_error;
1357
1358         if (dummy == 1) {
1359                 /* nii_domain */
1360                 READ_BUF(4);
1361                 dummy = be32_to_cpup(p++);
1362                 READ_BUF(dummy);
1363                 p += XDR_QUADLEN(dummy);
1364
1365                 /* nii_name */
1366                 READ_BUF(4);
1367                 dummy = be32_to_cpup(p++);
1368                 READ_BUF(dummy);
1369                 p += XDR_QUADLEN(dummy);
1370
1371                 /* nii_date */
1372                 READ_BUF(12);
1373                 p += 3;
1374         }
1375         DECODE_TAIL;
1376 }
1377
1378 static __be32
1379 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1380                             struct nfsd4_create_session *sess)
1381 {
1382         DECODE_HEAD;
1383         u32 dummy;
1384
1385         READ_BUF(16);
1386         COPYMEM(&sess->clientid, 8);
1387         sess->seqid = be32_to_cpup(p++);
1388         sess->flags = be32_to_cpup(p++);
1389
1390         /* Fore channel attrs */
1391         READ_BUF(28);
1392         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1393         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1394         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1395         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1396         sess->fore_channel.maxops = be32_to_cpup(p++);
1397         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1398         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1399         if (sess->fore_channel.nr_rdma_attrs == 1) {
1400                 READ_BUF(4);
1401                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1402         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1403                 dprintk("Too many fore channel attr bitmaps!\n");
1404                 goto xdr_error;
1405         }
1406
1407         /* Back channel attrs */
1408         READ_BUF(28);
1409         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1410         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1411         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1412         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1413         sess->back_channel.maxops = be32_to_cpup(p++);
1414         sess->back_channel.maxreqs = be32_to_cpup(p++);
1415         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1416         if (sess->back_channel.nr_rdma_attrs == 1) {
1417                 READ_BUF(4);
1418                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1419         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1420                 dprintk("Too many back channel attr bitmaps!\n");
1421                 goto xdr_error;
1422         }
1423
1424         READ_BUF(4);
1425         sess->callback_prog = be32_to_cpup(p++);
1426         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1427         DECODE_TAIL;
1428 }
1429
1430 static __be32
1431 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1432                              struct nfsd4_destroy_session *destroy_session)
1433 {
1434         DECODE_HEAD;
1435         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1436         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1437
1438         DECODE_TAIL;
1439 }
1440
1441 static __be32
1442 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1443                           struct nfsd4_free_stateid *free_stateid)
1444 {
1445         DECODE_HEAD;
1446
1447         READ_BUF(sizeof(stateid_t));
1448         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1449         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1450
1451         DECODE_TAIL;
1452 }
1453
1454 static __be32
1455 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1456                       struct nfsd4_sequence *seq)
1457 {
1458         DECODE_HEAD;
1459
1460         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1461         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1462         seq->seqid = be32_to_cpup(p++);
1463         seq->slotid = be32_to_cpup(p++);
1464         seq->maxslots = be32_to_cpup(p++);
1465         seq->cachethis = be32_to_cpup(p++);
1466
1467         DECODE_TAIL;
1468 }
1469
1470 static __be32
1471 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1472 {
1473         int i;
1474         __be32 *p, status;
1475         struct nfsd4_test_stateid_id *stateid;
1476
1477         READ_BUF(4);
1478         test_stateid->ts_num_ids = ntohl(*p++);
1479
1480         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1481
1482         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1483                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1484                 if (!stateid) {
1485                         status = nfserrno(-ENOMEM);
1486                         goto out;
1487                 }
1488
1489                 INIT_LIST_HEAD(&stateid->ts_id_list);
1490                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1491
1492                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1493                 if (status)
1494                         goto out;
1495         }
1496
1497         status = 0;
1498 out:
1499         return status;
1500 xdr_error:
1501         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1502         status = nfserr_bad_xdr;
1503         goto out;
1504 }
1505
1506 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1507 {
1508         DECODE_HEAD;
1509
1510         READ_BUF(8);
1511         COPYMEM(&dc->clientid, 8);
1512
1513         DECODE_TAIL;
1514 }
1515
1516 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1517 {
1518         DECODE_HEAD;
1519
1520         READ_BUF(4);
1521         rc->rca_one_fs = be32_to_cpup(p++);
1522
1523         DECODE_TAIL;
1524 }
1525
1526 #ifdef CONFIG_NFSD_PNFS
1527 static __be32
1528 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1529                 struct nfsd4_getdeviceinfo *gdev)
1530 {
1531         DECODE_HEAD;
1532         u32 num, i;
1533
1534         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1535         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1536         gdev->gd_layout_type = be32_to_cpup(p++);
1537         gdev->gd_maxcount = be32_to_cpup(p++);
1538         num = be32_to_cpup(p++);
1539         if (num) {
1540                 READ_BUF(4 * num);
1541                 gdev->gd_notify_types = be32_to_cpup(p++);
1542                 for (i = 1; i < num; i++) {
1543                         if (be32_to_cpup(p++)) {
1544                                 status = nfserr_inval;
1545                                 goto out;
1546                         }
1547                 }
1548         }
1549         DECODE_TAIL;
1550 }
1551
1552 static __be32
1553 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1554                 struct nfsd4_layoutget *lgp)
1555 {
1556         DECODE_HEAD;
1557
1558         READ_BUF(36);
1559         lgp->lg_signal = be32_to_cpup(p++);
1560         lgp->lg_layout_type = be32_to_cpup(p++);
1561         lgp->lg_seg.iomode = be32_to_cpup(p++);
1562         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1563         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1564         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1565
1566         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1567         if (status)
1568                 return status;
1569
1570         READ_BUF(4);
1571         lgp->lg_maxcount = be32_to_cpup(p++);
1572
1573         DECODE_TAIL;
1574 }
1575
1576 static __be32
1577 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1578                 struct nfsd4_layoutcommit *lcp)
1579 {
1580         DECODE_HEAD;
1581         u32 timechange;
1582
1583         READ_BUF(20);
1584         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1585         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1586         lcp->lc_reclaim = be32_to_cpup(p++);
1587
1588         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1589         if (status)
1590                 return status;
1591
1592         READ_BUF(4);
1593         lcp->lc_newoffset = be32_to_cpup(p++);
1594         if (lcp->lc_newoffset) {
1595                 READ_BUF(8);
1596                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1597         } else
1598                 lcp->lc_last_wr = 0;
1599         READ_BUF(4);
1600         timechange = be32_to_cpup(p++);
1601         if (timechange) {
1602                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1603                 if (status)
1604                         return status;
1605         } else {
1606                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1607         }
1608         READ_BUF(8);
1609         lcp->lc_layout_type = be32_to_cpup(p++);
1610
1611         /*
1612          * Save the layout update in XDR format and let the layout driver deal
1613          * with it later.
1614          */
1615         lcp->lc_up_len = be32_to_cpup(p++);
1616         if (lcp->lc_up_len > 0) {
1617                 READ_BUF(lcp->lc_up_len);
1618                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1619         }
1620
1621         DECODE_TAIL;
1622 }
1623
1624 static __be32
1625 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1626                 struct nfsd4_layoutreturn *lrp)
1627 {
1628         DECODE_HEAD;
1629
1630         READ_BUF(16);
1631         lrp->lr_reclaim = be32_to_cpup(p++);
1632         lrp->lr_layout_type = be32_to_cpup(p++);
1633         lrp->lr_seg.iomode = be32_to_cpup(p++);
1634         lrp->lr_return_type = be32_to_cpup(p++);
1635         if (lrp->lr_return_type == RETURN_FILE) {
1636                 READ_BUF(16);
1637                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1638                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1639
1640                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1641                 if (status)
1642                         return status;
1643
1644                 READ_BUF(4);
1645                 lrp->lrf_body_len = be32_to_cpup(p++);
1646                 if (lrp->lrf_body_len > 0) {
1647                         READ_BUF(lrp->lrf_body_len);
1648                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1649                 }
1650         } else {
1651                 lrp->lr_seg.offset = 0;
1652                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1653         }
1654
1655         DECODE_TAIL;
1656 }
1657 #endif /* CONFIG_NFSD_PNFS */
1658
1659 static __be32
1660 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1661                        struct nfsd4_fallocate *fallocate)
1662 {
1663         DECODE_HEAD;
1664
1665         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1666         if (status)
1667                 return status;
1668
1669         READ_BUF(16);
1670         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1671         xdr_decode_hyper(p, &fallocate->falloc_length);
1672
1673         DECODE_TAIL;
1674 }
1675
1676 static __be32
1677 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1678 {
1679         DECODE_HEAD;
1680
1681         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1682         if (status)
1683                 return status;
1684
1685         READ_BUF(8 + 4);
1686         p = xdr_decode_hyper(p, &seek->seek_offset);
1687         seek->seek_whence = be32_to_cpup(p);
1688
1689         DECODE_TAIL;
1690 }
1691
1692 static __be32
1693 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1694 {
1695         return nfs_ok;
1696 }
1697
1698 static __be32
1699 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1700 {
1701         return nfserr_notsupp;
1702 }
1703
1704 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1705
1706 static nfsd4_dec nfsd4_dec_ops[] = {
1707         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1708         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1709         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1710         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1711         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1712         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1713         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1714         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1715         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1716         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1717         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1718         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1719         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1720         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1721         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1722         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1723         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1724         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1725         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1726         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1727         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1728         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1729         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1730         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1731         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1732         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1733         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1734         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1735         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1736         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1737         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1738         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1739         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1740         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1741         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1742         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1743         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1744
1745         /* new operations for NFSv4.1 */
1746         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1747         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1748         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1749         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1750         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1751         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1752         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1753 #ifdef CONFIG_NFSD_PNFS
1754         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1755         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1756         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1757         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1758         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1759 #else
1760         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1761         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1762         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1763         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1764         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1765 #endif
1766         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1767         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1768         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1769         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1770         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1771         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1772         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1773
1774         /* new operations for NFSv4.2 */
1775         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1776         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_notsupp,
1777         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1778         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1779         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1780         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1781         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1782         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1783         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1784         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1785         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1786         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1787 };
1788
1789 static inline bool
1790 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1791 {
1792         if (op->opnum < FIRST_NFS4_OP)
1793                 return false;
1794         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1795                 return false;
1796         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1797                 return false;
1798         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1799                 return false;
1800         return true;
1801 }
1802
1803 static __be32
1804 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1805 {
1806         DECODE_HEAD;
1807         struct nfsd4_op *op;
1808         bool cachethis = false;
1809         int auth_slack= argp->rqstp->rq_auth_slack;
1810         int max_reply = auth_slack + 8; /* opcnt, status */
1811         int readcount = 0;
1812         int readbytes = 0;
1813         int i;
1814
1815         READ_BUF(4);
1816         argp->taglen = be32_to_cpup(p++);
1817         READ_BUF(argp->taglen + 8);
1818         SAVEMEM(argp->tag, argp->taglen);
1819         argp->minorversion = be32_to_cpup(p++);
1820         argp->opcnt = be32_to_cpup(p++);
1821         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1822
1823         if (argp->taglen > NFSD4_MAX_TAGLEN)
1824                 goto xdr_error;
1825         if (argp->opcnt > 100)
1826                 goto xdr_error;
1827
1828         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1829                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1830                 if (!argp->ops) {
1831                         argp->ops = argp->iops;
1832                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1833                         goto xdr_error;
1834                 }
1835         }
1836
1837         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1838                 argp->opcnt = 0;
1839
1840         for (i = 0; i < argp->opcnt; i++) {
1841                 op = &argp->ops[i];
1842                 op->replay = NULL;
1843
1844                 READ_BUF(4);
1845                 op->opnum = be32_to_cpup(p++);
1846
1847                 if (nfsd4_opnum_in_range(argp, op))
1848                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1849                 else {
1850                         op->opnum = OP_ILLEGAL;
1851                         op->status = nfserr_op_illegal;
1852                 }
1853                 /*
1854                  * We'll try to cache the result in the DRC if any one
1855                  * op in the compound wants to be cached:
1856                  */
1857                 cachethis |= nfsd4_cache_this_op(op);
1858
1859                 if (op->opnum == OP_READ) {
1860                         readcount++;
1861                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1862                 } else
1863                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1864                 /*
1865                  * OP_LOCK may return a conflicting lock.  (Special case
1866                  * because it will just skip encoding this if it runs
1867                  * out of xdr buffer space, and it is the only operation
1868                  * that behaves this way.)
1869                  */
1870                 if (op->opnum == OP_LOCK)
1871                         max_reply += NFS4_OPAQUE_LIMIT;
1872
1873                 if (op->status) {
1874                         argp->opcnt = i+1;
1875                         break;
1876                 }
1877         }
1878         /* Sessions make the DRC unnecessary: */
1879         if (argp->minorversion)
1880                 cachethis = false;
1881         svc_reserve(argp->rqstp, max_reply + readbytes);
1882         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1883
1884         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1885                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1886
1887         DECODE_TAIL;
1888 }
1889
1890 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1891 {
1892         if (IS_I_VERSION(inode)) {
1893                 p = xdr_encode_hyper(p, inode->i_version);
1894         } else {
1895                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1896                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1897         }
1898         return p;
1899 }
1900
1901 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1902 {
1903         *p++ = cpu_to_be32(c->atomic);
1904         if (c->change_supported) {
1905                 p = xdr_encode_hyper(p, c->before_change);
1906                 p = xdr_encode_hyper(p, c->after_change);
1907         } else {
1908                 *p++ = cpu_to_be32(c->before_ctime_sec);
1909                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1910                 *p++ = cpu_to_be32(c->after_ctime_sec);
1911                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1912         }
1913         return p;
1914 }
1915
1916 /* Encode as an array of strings the string given with components
1917  * separated @sep, escaped with esc_enter and esc_exit.
1918  */
1919 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1920                                           char *components, char esc_enter,
1921                                           char esc_exit)
1922 {
1923         __be32 *p;
1924         __be32 pathlen;
1925         int pathlen_offset;
1926         int strlen, count=0;
1927         char *str, *end, *next;
1928
1929         dprintk("nfsd4_encode_components(%s)\n", components);
1930
1931         pathlen_offset = xdr->buf->len;
1932         p = xdr_reserve_space(xdr, 4);
1933         if (!p)
1934                 return nfserr_resource;
1935         p++; /* We will fill this in with @count later */
1936
1937         end = str = components;
1938         while (*end) {
1939                 bool found_esc = false;
1940
1941                 /* try to parse as esc_start, ..., esc_end, sep */
1942                 if (*str == esc_enter) {
1943                         for (; *end && (*end != esc_exit); end++)
1944                                 /* find esc_exit or end of string */;
1945                         next = end + 1;
1946                         if (*end && (!*next || *next == sep)) {
1947                                 str++;
1948                                 found_esc = true;
1949                         }
1950                 }
1951
1952                 if (!found_esc)
1953                         for (; *end && (*end != sep); end++)
1954                                 /* find sep or end of string */;
1955
1956                 strlen = end - str;
1957                 if (strlen) {
1958                         p = xdr_reserve_space(xdr, strlen + 4);
1959                         if (!p)
1960                                 return nfserr_resource;
1961                         p = xdr_encode_opaque(p, str, strlen);
1962                         count++;
1963                 }
1964                 else
1965                         end++;
1966                 if (found_esc)
1967                         end = next;
1968
1969                 str = end;
1970         }
1971         pathlen = htonl(count);
1972         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1973         return 0;
1974 }
1975
1976 /* Encode as an array of strings the string given with components
1977  * separated @sep.
1978  */
1979 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1980                                       char *components)
1981 {
1982         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1983 }
1984
1985 /*
1986  * encode a location element of a fs_locations structure
1987  */
1988 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1989                                         struct nfsd4_fs_location *location)
1990 {
1991         __be32 status;
1992
1993         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1994                                                 '[', ']');
1995         if (status)
1996                 return status;
1997         status = nfsd4_encode_components(xdr, '/', location->path);
1998         if (status)
1999                 return status;
2000         return 0;
2001 }
2002
2003 /*
2004  * Encode a path in RFC3530 'pathname4' format
2005  */
2006 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2007                                 const struct path *root,
2008                                 const struct path *path)
2009 {
2010         struct path cur = *path;
2011         __be32 *p;
2012         struct dentry **components = NULL;
2013         unsigned int ncomponents = 0;
2014         __be32 err = nfserr_jukebox;
2015
2016         dprintk("nfsd4_encode_components(");
2017
2018         path_get(&cur);
2019         /* First walk the path up to the nfsd root, and store the
2020          * dentries/path components in an array.
2021          */
2022         for (;;) {
2023                 if (path_equal(&cur, root))
2024                         break;
2025                 if (cur.dentry == cur.mnt->mnt_root) {
2026                         if (follow_up(&cur))
2027                                 continue;
2028                         goto out_free;
2029                 }
2030                 if ((ncomponents & 15) == 0) {
2031                         struct dentry **new;
2032                         new = krealloc(components,
2033                                         sizeof(*new) * (ncomponents + 16),
2034                                         GFP_KERNEL);
2035                         if (!new)
2036                                 goto out_free;
2037                         components = new;
2038                 }
2039                 components[ncomponents++] = cur.dentry;
2040                 cur.dentry = dget_parent(cur.dentry);
2041         }
2042         err = nfserr_resource;
2043         p = xdr_reserve_space(xdr, 4);
2044         if (!p)
2045                 goto out_free;
2046         *p++ = cpu_to_be32(ncomponents);
2047
2048         while (ncomponents) {
2049                 struct dentry *dentry = components[ncomponents - 1];
2050                 unsigned int len;
2051
2052                 spin_lock(&dentry->d_lock);
2053                 len = dentry->d_name.len;
2054                 p = xdr_reserve_space(xdr, len + 4);
2055                 if (!p) {
2056                         spin_unlock(&dentry->d_lock);
2057                         goto out_free;
2058                 }
2059                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2060                 dprintk("/%pd", dentry);
2061                 spin_unlock(&dentry->d_lock);
2062                 dput(dentry);
2063                 ncomponents--;
2064         }
2065
2066         err = 0;
2067 out_free:
2068         dprintk(")\n");
2069         while (ncomponents)
2070                 dput(components[--ncomponents]);
2071         kfree(components);
2072         path_put(&cur);
2073         return err;
2074 }
2075
2076 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2077                         struct svc_rqst *rqstp, const struct path *path)
2078 {
2079         struct svc_export *exp_ps;
2080         __be32 res;
2081
2082         exp_ps = rqst_find_fsidzero_export(rqstp);
2083         if (IS_ERR(exp_ps))
2084                 return nfserrno(PTR_ERR(exp_ps));
2085         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2086         exp_put(exp_ps);
2087         return res;
2088 }
2089
2090 /*
2091  *  encode a fs_locations structure
2092  */
2093 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2094                         struct svc_rqst *rqstp, struct svc_export *exp)
2095 {
2096         __be32 status;
2097         int i;
2098         __be32 *p;
2099         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2100
2101         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2102         if (status)
2103                 return status;
2104         p = xdr_reserve_space(xdr, 4);
2105         if (!p)
2106                 return nfserr_resource;
2107         *p++ = cpu_to_be32(fslocs->locations_count);
2108         for (i=0; i<fslocs->locations_count; i++) {
2109                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2110                 if (status)
2111                         return status;
2112         }
2113         return 0;
2114 }
2115
2116 static u32 nfs4_file_type(umode_t mode)
2117 {
2118         switch (mode & S_IFMT) {
2119         case S_IFIFO:   return NF4FIFO;
2120         case S_IFCHR:   return NF4CHR;
2121         case S_IFDIR:   return NF4DIR;
2122         case S_IFBLK:   return NF4BLK;
2123         case S_IFLNK:   return NF4LNK;
2124         case S_IFREG:   return NF4REG;
2125         case S_IFSOCK:  return NF4SOCK;
2126         default:        return NF4BAD;
2127         };
2128 }
2129
2130 static inline __be32
2131 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2132                      struct nfs4_ace *ace)
2133 {
2134         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2135                 return nfs4_acl_write_who(xdr, ace->whotype);
2136         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2137                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2138         else
2139                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2140 }
2141
2142 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2143                               FATTR4_WORD0_RDATTR_ERROR)
2144 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2145 #define WORD2_ABSENT_FS_ATTRS 0
2146
2147 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2148 static inline __be32
2149 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2150                             void *context, int len)
2151 {
2152         __be32 *p;
2153
2154         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2155         if (!p)
2156                 return nfserr_resource;
2157
2158         /*
2159          * For now we use a 0 here to indicate the null translation; in
2160          * the future we may place a call to translation code here.
2161          */
2162         *p++ = cpu_to_be32(0); /* lfs */
2163         *p++ = cpu_to_be32(0); /* pi */
2164         p = xdr_encode_opaque(p, context, len);
2165         return 0;
2166 }
2167 #else
2168 static inline __be32
2169 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2170                             void *context, int len)
2171 { return 0; }
2172 #endif
2173
2174 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2175 {
2176         /* As per referral draft:  */
2177         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2178             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2179                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2180                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2181                         *rdattr_err = NFSERR_MOVED;
2182                 else
2183                         return nfserr_moved;
2184         }
2185         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2186         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2187         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2188         return 0;
2189 }
2190
2191
2192 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2193 {
2194         struct path path = exp->ex_path;
2195         int err;
2196
2197         path_get(&path);
2198         while (follow_up(&path)) {
2199                 if (path.dentry != path.mnt->mnt_root)
2200                         break;
2201         }
2202         err = vfs_getattr(&path, stat);
2203         path_put(&path);
2204         return err;
2205 }
2206
2207 /*
2208  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2209  * ourselves.
2210  */
2211 static __be32
2212 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2213                 struct svc_export *exp,
2214                 struct dentry *dentry, u32 *bmval,
2215                 struct svc_rqst *rqstp, int ignore_crossmnt)
2216 {
2217         u32 bmval0 = bmval[0];
2218         u32 bmval1 = bmval[1];
2219         u32 bmval2 = bmval[2];
2220         struct kstat stat;
2221         struct svc_fh *tempfh = NULL;
2222         struct kstatfs statfs;
2223         __be32 *p;
2224         int starting_len = xdr->buf->len;
2225         int attrlen_offset;
2226         __be32 attrlen;
2227         u32 dummy;
2228         u64 dummy64;
2229         u32 rdattr_err = 0;
2230         __be32 status;
2231         int err;
2232         int aclsupport = 0;
2233         struct nfs4_acl *acl = NULL;
2234         void *context = NULL;
2235         int contextlen;
2236         bool contextsupport = false;
2237         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2238         u32 minorversion = resp->cstate.minorversion;
2239         struct path path = {
2240                 .mnt    = exp->ex_path.mnt,
2241                 .dentry = dentry,
2242         };
2243         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2244
2245         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2246         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2247         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2248         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2249
2250         if (exp->ex_fslocs.migrated) {
2251                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2252                 if (status)
2253                         goto out;
2254         }
2255
2256         err = vfs_getattr(&path, &stat);
2257         if (err)
2258                 goto out_nfserr;
2259         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2260                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2261             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2262                        FATTR4_WORD1_SPACE_TOTAL))) {
2263                 err = vfs_statfs(&path, &statfs);
2264                 if (err)
2265                         goto out_nfserr;
2266         }
2267         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2268                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2269                 status = nfserr_jukebox;
2270                 if (!tempfh)
2271                         goto out;
2272                 fh_init(tempfh, NFS4_FHSIZE);
2273                 status = fh_compose(tempfh, exp, dentry, NULL);
2274                 if (status)
2275                         goto out;
2276                 fhp = tempfh;
2277         }
2278         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2279                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2280                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2281                 aclsupport = (err == 0);
2282                 if (bmval0 & FATTR4_WORD0_ACL) {
2283                         if (err == -EOPNOTSUPP)
2284                                 bmval0 &= ~FATTR4_WORD0_ACL;
2285                         else if (err == -EINVAL) {
2286                                 status = nfserr_attrnotsupp;
2287                                 goto out;
2288                         } else if (err != 0)
2289                                 goto out_nfserr;
2290                 }
2291         }
2292
2293 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2294         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2295              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2296                 err = security_inode_getsecctx(d_inode(dentry),
2297                                                 &context, &contextlen);
2298                 contextsupport = (err == 0);
2299                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2300                         if (err == -EOPNOTSUPP)
2301                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2302                         else if (err)
2303                                 goto out_nfserr;
2304                 }
2305         }
2306 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2307
2308         if (bmval2) {
2309                 p = xdr_reserve_space(xdr, 16);
2310                 if (!p)
2311                         goto out_resource;
2312                 *p++ = cpu_to_be32(3);
2313                 *p++ = cpu_to_be32(bmval0);
2314                 *p++ = cpu_to_be32(bmval1);
2315                 *p++ = cpu_to_be32(bmval2);
2316         } else if (bmval1) {
2317                 p = xdr_reserve_space(xdr, 12);
2318                 if (!p)
2319                         goto out_resource;
2320                 *p++ = cpu_to_be32(2);
2321                 *p++ = cpu_to_be32(bmval0);
2322                 *p++ = cpu_to_be32(bmval1);
2323         } else {
2324                 p = xdr_reserve_space(xdr, 8);
2325                 if (!p)
2326                         goto out_resource;
2327                 *p++ = cpu_to_be32(1);
2328                 *p++ = cpu_to_be32(bmval0);
2329         }
2330
2331         attrlen_offset = xdr->buf->len;
2332         p = xdr_reserve_space(xdr, 4);
2333         if (!p)
2334                 goto out_resource;
2335         p++;                /* to be backfilled later */
2336
2337         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2338                 u32 word0 = nfsd_suppattrs0(minorversion);
2339                 u32 word1 = nfsd_suppattrs1(minorversion);
2340                 u32 word2 = nfsd_suppattrs2(minorversion);
2341
2342                 if (!aclsupport)
2343                         word0 &= ~FATTR4_WORD0_ACL;
2344                 if (!contextsupport)
2345                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2346                 if (!word2) {
2347                         p = xdr_reserve_space(xdr, 12);
2348                         if (!p)
2349                                 goto out_resource;
2350                         *p++ = cpu_to_be32(2);
2351                         *p++ = cpu_to_be32(word0);
2352                         *p++ = cpu_to_be32(word1);
2353                 } else {
2354                         p = xdr_reserve_space(xdr, 16);
2355                         if (!p)
2356                                 goto out_resource;
2357                         *p++ = cpu_to_be32(3);
2358                         *p++ = cpu_to_be32(word0);
2359                         *p++ = cpu_to_be32(word1);
2360                         *p++ = cpu_to_be32(word2);
2361                 }
2362         }
2363         if (bmval0 & FATTR4_WORD0_TYPE) {
2364                 p = xdr_reserve_space(xdr, 4);
2365                 if (!p)
2366                         goto out_resource;
2367                 dummy = nfs4_file_type(stat.mode);
2368                 if (dummy == NF4BAD) {
2369                         status = nfserr_serverfault;
2370                         goto out;
2371                 }
2372                 *p++ = cpu_to_be32(dummy);
2373         }
2374         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2375                 p = xdr_reserve_space(xdr, 4);
2376                 if (!p)
2377                         goto out_resource;
2378                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2379                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2380                 else
2381                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2382                                                 NFS4_FH_VOL_RENAME);
2383         }
2384         if (bmval0 & FATTR4_WORD0_CHANGE) {
2385                 p = xdr_reserve_space(xdr, 8);
2386                 if (!p)
2387                         goto out_resource;
2388                 p = encode_change(p, &stat, d_inode(dentry));
2389         }
2390         if (bmval0 & FATTR4_WORD0_SIZE) {
2391                 p = xdr_reserve_space(xdr, 8);
2392                 if (!p)
2393                         goto out_resource;
2394                 p = xdr_encode_hyper(p, stat.size);
2395         }
2396         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2397                 p = xdr_reserve_space(xdr, 4);
2398                 if (!p)
2399                         goto out_resource;
2400                 *p++ = cpu_to_be32(1);
2401         }
2402         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2403                 p = xdr_reserve_space(xdr, 4);
2404                 if (!p)
2405                         goto out_resource;
2406                 *p++ = cpu_to_be32(1);
2407         }
2408         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2409                 p = xdr_reserve_space(xdr, 4);
2410                 if (!p)
2411                         goto out_resource;
2412                 *p++ = cpu_to_be32(0);
2413         }
2414         if (bmval0 & FATTR4_WORD0_FSID) {
2415                 p = xdr_reserve_space(xdr, 16);
2416                 if (!p)
2417                         goto out_resource;
2418                 if (exp->ex_fslocs.migrated) {
2419                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2420                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2421                 } else switch(fsid_source(fhp)) {
2422                 case FSIDSOURCE_FSID:
2423                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2424                         p = xdr_encode_hyper(p, (u64)0);
2425                         break;
2426                 case FSIDSOURCE_DEV:
2427                         *p++ = cpu_to_be32(0);
2428                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2429                         *p++ = cpu_to_be32(0);
2430                         *p++ = cpu_to_be32(MINOR(stat.dev));
2431                         break;
2432                 case FSIDSOURCE_UUID:
2433                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2434                                                                 EX_UUID_LEN);
2435                         break;
2436                 }
2437         }
2438         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2439                 p = xdr_reserve_space(xdr, 4);
2440                 if (!p)
2441                         goto out_resource;
2442                 *p++ = cpu_to_be32(0);
2443         }
2444         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2445                 p = xdr_reserve_space(xdr, 4);
2446                 if (!p)
2447                         goto out_resource;
2448                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2449         }
2450         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2451                 p = xdr_reserve_space(xdr, 4);
2452                 if (!p)
2453                         goto out_resource;
2454                 *p++ = cpu_to_be32(rdattr_err);
2455         }
2456         if (bmval0 & FATTR4_WORD0_ACL) {
2457                 struct nfs4_ace *ace;
2458
2459                 if (acl == NULL) {
2460                         p = xdr_reserve_space(xdr, 4);
2461                         if (!p)
2462                                 goto out_resource;
2463
2464                         *p++ = cpu_to_be32(0);
2465                         goto out_acl;
2466                 }
2467                 p = xdr_reserve_space(xdr, 4);
2468                 if (!p)
2469                         goto out_resource;
2470                 *p++ = cpu_to_be32(acl->naces);
2471
2472                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2473                         p = xdr_reserve_space(xdr, 4*3);
2474                         if (!p)
2475                                 goto out_resource;
2476                         *p++ = cpu_to_be32(ace->type);
2477                         *p++ = cpu_to_be32(ace->flag);
2478                         *p++ = cpu_to_be32(ace->access_mask &
2479                                                         NFS4_ACE_MASK_ALL);
2480                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2481                         if (status)
2482                                 goto out;
2483                 }
2484         }
2485 out_acl:
2486         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2487                 p = xdr_reserve_space(xdr, 4);
2488                 if (!p)
2489                         goto out_resource;
2490                 *p++ = cpu_to_be32(aclsupport ?
2491                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2492         }
2493         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2494                 p = xdr_reserve_space(xdr, 4);
2495                 if (!p)
2496                         goto out_resource;
2497                 *p++ = cpu_to_be32(1);
2498         }
2499         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2500                 p = xdr_reserve_space(xdr, 4);
2501                 if (!p)
2502                         goto out_resource;
2503                 *p++ = cpu_to_be32(0);
2504         }
2505         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2506                 p = xdr_reserve_space(xdr, 4);
2507                 if (!p)
2508                         goto out_resource;
2509                 *p++ = cpu_to_be32(1);
2510         }
2511         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2512                 p = xdr_reserve_space(xdr, 4);
2513                 if (!p)
2514                         goto out_resource;
2515                 *p++ = cpu_to_be32(1);
2516         }
2517         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2518                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2519                 if (!p)
2520                         goto out_resource;
2521                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2522                                         fhp->fh_handle.fh_size);
2523         }
2524         if (bmval0 & FATTR4_WORD0_FILEID) {
2525                 p = xdr_reserve_space(xdr, 8);
2526                 if (!p)
2527                         goto out_resource;
2528                 p = xdr_encode_hyper(p, stat.ino);
2529         }
2530         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2531                 p = xdr_reserve_space(xdr, 8);
2532                 if (!p)
2533                         goto out_resource;
2534                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2535         }
2536         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2537                 p = xdr_reserve_space(xdr, 8);
2538                 if (!p)
2539                         goto out_resource;
2540                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2541         }
2542         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2543                 p = xdr_reserve_space(xdr, 8);
2544                 if (!p)
2545                         goto out_resource;
2546                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2547         }
2548         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2549                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2550                 if (status)
2551                         goto out;
2552         }
2553         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2554                 p = xdr_reserve_space(xdr, 4);
2555                 if (!p)
2556                         goto out_resource;
2557                 *p++ = cpu_to_be32(1);
2558         }
2559         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2560                 p = xdr_reserve_space(xdr, 8);
2561                 if (!p)
2562                         goto out_resource;
2563                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2564         }
2565         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2566                 p = xdr_reserve_space(xdr, 4);
2567                 if (!p)
2568                         goto out_resource;
2569                 *p++ = cpu_to_be32(255);
2570         }
2571         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2572                 p = xdr_reserve_space(xdr, 4);
2573                 if (!p)
2574                         goto out_resource;
2575                 *p++ = cpu_to_be32(statfs.f_namelen);
2576         }
2577         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2578                 p = xdr_reserve_space(xdr, 8);
2579                 if (!p)
2580                         goto out_resource;
2581                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2582         }
2583         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2584                 p = xdr_reserve_space(xdr, 8);
2585                 if (!p)
2586                         goto out_resource;
2587                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2588         }
2589         if (bmval1 & FATTR4_WORD1_MODE) {
2590                 p = xdr_reserve_space(xdr, 4);
2591                 if (!p)
2592                         goto out_resource;
2593                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2594         }
2595         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2596                 p = xdr_reserve_space(xdr, 4);
2597                 if (!p)
2598                         goto out_resource;
2599                 *p++ = cpu_to_be32(1);
2600         }
2601         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2602                 p = xdr_reserve_space(xdr, 4);
2603                 if (!p)
2604                         goto out_resource;
2605                 *p++ = cpu_to_be32(stat.nlink);
2606         }
2607         if (bmval1 & FATTR4_WORD1_OWNER) {
2608                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2609                 if (status)
2610                         goto out;
2611         }
2612         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2613                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2614                 if (status)
2615                         goto out;
2616         }
2617         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2618                 p = xdr_reserve_space(xdr, 8);
2619                 if (!p)
2620                         goto out_resource;
2621                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2622                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2623         }
2624         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2625                 p = xdr_reserve_space(xdr, 8);
2626                 if (!p)
2627                         goto out_resource;
2628                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2629                 p = xdr_encode_hyper(p, dummy64);
2630         }
2631         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2632                 p = xdr_reserve_space(xdr, 8);
2633                 if (!p)
2634                         goto out_resource;
2635                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2636                 p = xdr_encode_hyper(p, dummy64);
2637         }
2638         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2639                 p = xdr_reserve_space(xdr, 8);
2640                 if (!p)
2641                         goto out_resource;
2642                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2643                 p = xdr_encode_hyper(p, dummy64);
2644         }
2645         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2646                 p = xdr_reserve_space(xdr, 8);
2647                 if (!p)
2648                         goto out_resource;
2649                 dummy64 = (u64)stat.blocks << 9;
2650                 p = xdr_encode_hyper(p, dummy64);
2651         }
2652         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2653                 p = xdr_reserve_space(xdr, 12);
2654                 if (!p)
2655                         goto out_resource;
2656                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2657                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2658         }
2659         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2660                 p = xdr_reserve_space(xdr, 12);
2661                 if (!p)
2662                         goto out_resource;
2663                 *p++ = cpu_to_be32(0);
2664                 *p++ = cpu_to_be32(1);
2665                 *p++ = cpu_to_be32(0);
2666         }
2667         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2668                 p = xdr_reserve_space(xdr, 12);
2669                 if (!p)
2670                         goto out_resource;
2671                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2672                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2673         }
2674         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2675                 p = xdr_reserve_space(xdr, 12);
2676                 if (!p)
2677                         goto out_resource;
2678                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2679                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2680         }
2681         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2682                 p = xdr_reserve_space(xdr, 8);
2683                 if (!p)
2684                         goto out_resource;
2685                 /*
2686                  * Get parent's attributes if not ignoring crossmount
2687                  * and this is the root of a cross-mounted filesystem.
2688                  */
2689                 if (ignore_crossmnt == 0 &&
2690                     dentry == exp->ex_path.mnt->mnt_root)
2691                         get_parent_attributes(exp, &stat);
2692                 p = xdr_encode_hyper(p, stat.ino);
2693         }
2694 #ifdef CONFIG_NFSD_PNFS
2695         if ((bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) ||
2696             (bmval2 & FATTR4_WORD2_LAYOUT_TYPES)) {
2697                 if (exp->ex_layout_type) {
2698                         p = xdr_reserve_space(xdr, 8);
2699                         if (!p)
2700                                 goto out_resource;
2701                         *p++ = cpu_to_be32(1);
2702                         *p++ = cpu_to_be32(exp->ex_layout_type);
2703                 } else {
2704                         p = xdr_reserve_space(xdr, 4);
2705                         if (!p)
2706                                 goto out_resource;
2707                         *p++ = cpu_to_be32(0);
2708                 }
2709         }
2710
2711         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2712                 p = xdr_reserve_space(xdr, 4);
2713                 if (!p)
2714                         goto out_resource;
2715                 *p++ = cpu_to_be32(stat.blksize);
2716         }
2717 #endif /* CONFIG_NFSD_PNFS */
2718         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2719                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2720                                                                 contextlen);
2721                 if (status)
2722                         goto out;
2723         }
2724         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2725                 p = xdr_reserve_space(xdr, 16);
2726                 if (!p)
2727                         goto out_resource;
2728                 *p++ = cpu_to_be32(3);
2729                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2730                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2731                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2732         }
2733
2734         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2735         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2736         status = nfs_ok;
2737
2738 out:
2739 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2740         if (context)
2741                 security_release_secctx(context, contextlen);
2742 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2743         kfree(acl);
2744         if (tempfh) {
2745                 fh_put(tempfh);
2746                 kfree(tempfh);
2747         }
2748         if (status)
2749                 xdr_truncate_encode(xdr, starting_len);
2750         return status;
2751 out_nfserr:
2752         status = nfserrno(err);
2753         goto out;
2754 out_resource:
2755         status = nfserr_resource;
2756         goto out;
2757 }
2758
2759 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2760                                 struct xdr_buf *buf, __be32 *p, int bytes)
2761 {
2762         xdr->scratch.iov_len = 0;
2763         memset(buf, 0, sizeof(struct xdr_buf));
2764         buf->head[0].iov_base = p;
2765         buf->head[0].iov_len = 0;
2766         buf->len = 0;
2767         xdr->buf = buf;
2768         xdr->iov = buf->head;
2769         xdr->p = p;
2770         xdr->end = (void *)p + bytes;
2771         buf->buflen = bytes;
2772 }
2773
2774 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2775                         struct svc_fh *fhp, struct svc_export *exp,
2776                         struct dentry *dentry, u32 *bmval,
2777                         struct svc_rqst *rqstp, int ignore_crossmnt)
2778 {
2779         struct xdr_buf dummy;
2780         struct xdr_stream xdr;
2781         __be32 ret;
2782
2783         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2784         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2785                                                         ignore_crossmnt);
2786         *p = xdr.p;
2787         return ret;
2788 }
2789
2790 static inline int attributes_need_mount(u32 *bmval)
2791 {
2792         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2793                 return 1;
2794         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2795                 return 1;
2796         return 0;
2797 }
2798
2799 static __be32
2800 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2801                         const char *name, int namlen)
2802 {
2803         struct svc_export *exp = cd->rd_fhp->fh_export;
2804         struct dentry *dentry;
2805         __be32 nfserr;
2806         int ignore_crossmnt = 0;
2807
2808         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2809         if (IS_ERR(dentry))
2810                 return nfserrno(PTR_ERR(dentry));
2811         if (d_really_is_negative(dentry)) {
2812                 /*
2813                  * nfsd_buffered_readdir drops the i_mutex between
2814                  * readdir and calling this callback, leaving a window
2815                  * where this directory entry could have gone away.
2816                  */
2817                 dput(dentry);
2818                 return nfserr_noent;
2819         }
2820
2821         exp_get(exp);
2822         /*
2823          * In the case of a mountpoint, the client may be asking for
2824          * attributes that are only properties of the underlying filesystem
2825          * as opposed to the cross-mounted file system. In such a case,
2826          * we will not follow the cross mount and will fill the attribtutes
2827          * directly from the mountpoint dentry.
2828          */
2829         if (nfsd_mountpoint(dentry, exp)) {
2830                 int err;
2831
2832                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2833                                 && !attributes_need_mount(cd->rd_bmval)) {
2834                         ignore_crossmnt = 1;
2835                         goto out_encode;
2836                 }
2837                 /*
2838                  * Why the heck aren't we just using nfsd_lookup??
2839                  * Different "."/".." handling?  Something else?
2840                  * At least, add a comment here to explain....
2841                  */
2842                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2843                 if (err) {
2844                         nfserr = nfserrno(err);
2845                         goto out_put;
2846                 }
2847                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2848                 if (nfserr)
2849                         goto out_put;
2850
2851         }
2852 out_encode:
2853         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2854                                         cd->rd_rqstp, ignore_crossmnt);
2855 out_put:
2856         dput(dentry);
2857         exp_put(exp);
2858         return nfserr;
2859 }
2860
2861 static __be32 *
2862 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2863 {
2864         __be32 *p;
2865
2866         p = xdr_reserve_space(xdr, 20);
2867         if (!p)
2868                 return NULL;
2869         *p++ = htonl(2);
2870         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2871         *p++ = htonl(0);                         /* bmval1 */
2872
2873         *p++ = htonl(4);     /* attribute length */
2874         *p++ = nfserr;       /* no htonl */
2875         return p;
2876 }
2877
2878 static int
2879 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2880                     loff_t offset, u64 ino, unsigned int d_type)
2881 {
2882         struct readdir_cd *ccd = ccdv;
2883         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2884         struct xdr_stream *xdr = cd->xdr;
2885         int start_offset = xdr->buf->len;
2886         int cookie_offset;
2887         u32 name_and_cookie;
2888         int entry_bytes;
2889         __be32 nfserr = nfserr_toosmall;
2890         __be64 wire_offset;
2891         __be32 *p;
2892
2893         /* In nfsv4, "." and ".." never make it onto the wire.. */
2894         if (name && isdotent(name, namlen)) {
2895                 cd->common.err = nfs_ok;
2896                 return 0;
2897         }
2898
2899         if (cd->cookie_offset) {
2900                 wire_offset = cpu_to_be64(offset);
2901                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2902                                                         &wire_offset, 8);
2903         }
2904
2905         p = xdr_reserve_space(xdr, 4);
2906         if (!p)
2907                 goto fail;
2908         *p++ = xdr_one;                             /* mark entry present */
2909         cookie_offset = xdr->buf->len;
2910         p = xdr_reserve_space(xdr, 3*4 + namlen);
2911         if (!p)
2912                 goto fail;
2913         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2914         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2915
2916         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2917         switch (nfserr) {
2918         case nfs_ok:
2919                 break;
2920         case nfserr_resource:
2921                 nfserr = nfserr_toosmall;
2922                 goto fail;
2923         case nfserr_noent:
2924                 xdr_truncate_encode(xdr, start_offset);
2925                 goto skip_entry;
2926         default:
2927                 /*
2928                  * If the client requested the RDATTR_ERROR attribute,
2929                  * we stuff the error code into this attribute
2930                  * and continue.  If this attribute was not requested,
2931                  * then in accordance with the spec, we fail the
2932                  * entire READDIR operation(!)
2933                  */
2934                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2935                         goto fail;
2936                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2937                 if (p == NULL) {
2938                         nfserr = nfserr_toosmall;
2939                         goto fail;
2940                 }
2941         }
2942         nfserr = nfserr_toosmall;
2943         entry_bytes = xdr->buf->len - start_offset;
2944         if (entry_bytes > cd->rd_maxcount)
2945                 goto fail;
2946         cd->rd_maxcount -= entry_bytes;
2947         /*
2948          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
2949          * let's always let through the first entry, at least:
2950          */
2951         if (!cd->rd_dircount)
2952                 goto fail;
2953         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
2954         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
2955                 goto fail;
2956         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
2957
2958         cd->cookie_offset = cookie_offset;
2959 skip_entry:
2960         cd->common.err = nfs_ok;
2961         return 0;
2962 fail:
2963         xdr_truncate_encode(xdr, start_offset);
2964         cd->common.err = nfserr;
2965         return -EINVAL;
2966 }
2967
2968 static __be32
2969 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2970 {
2971         __be32 *p;
2972
2973         p = xdr_reserve_space(xdr, sizeof(stateid_t));
2974         if (!p)
2975                 return nfserr_resource;
2976         *p++ = cpu_to_be32(sid->si_generation);
2977         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
2978                                         sizeof(stateid_opaque_t));
2979         return 0;
2980 }
2981
2982 static __be32
2983 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2984 {
2985         struct xdr_stream *xdr = &resp->xdr;
2986         __be32 *p;
2987
2988         if (!nfserr) {
2989                 p = xdr_reserve_space(xdr, 8);
2990                 if (!p)
2991                         return nfserr_resource;
2992                 *p++ = cpu_to_be32(access->ac_supported);
2993                 *p++ = cpu_to_be32(access->ac_resp_access);
2994         }
2995         return nfserr;
2996 }
2997
2998 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2999 {
3000         struct xdr_stream *xdr = &resp->xdr;
3001         __be32 *p;
3002
3003         if (!nfserr) {
3004                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3005                 if (!p)
3006                         return nfserr_resource;
3007                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3008                                                 NFS4_MAX_SESSIONID_LEN);
3009                 *p++ = cpu_to_be32(bcts->dir);
3010                 /* Sorry, we do not yet support RDMA over 4.1: */
3011                 *p++ = cpu_to_be32(0);
3012         }
3013         return nfserr;
3014 }
3015
3016 static __be32
3017 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3018 {
3019         struct xdr_stream *xdr = &resp->xdr;
3020
3021         if (!nfserr)
3022                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3023
3024         return nfserr;
3025 }
3026
3027
3028 static __be32
3029 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3030 {
3031         struct xdr_stream *xdr = &resp->xdr;
3032         __be32 *p;
3033
3034         if (!nfserr) {
3035                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3036                 if (!p)
3037                         return nfserr_resource;
3038                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3039                                                 NFS4_VERIFIER_SIZE);
3040         }
3041         return nfserr;
3042 }
3043
3044 static __be32
3045 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3046 {
3047         struct xdr_stream *xdr = &resp->xdr;
3048         __be32 *p;
3049
3050         if (!nfserr) {
3051                 p = xdr_reserve_space(xdr, 32);
3052                 if (!p)
3053                         return nfserr_resource;
3054                 p = encode_cinfo(p, &create->cr_cinfo);
3055                 *p++ = cpu_to_be32(2);
3056                 *p++ = cpu_to_be32(create->cr_bmval[0]);
3057                 *p++ = cpu_to_be32(create->cr_bmval[1]);
3058         }
3059         return nfserr;
3060 }
3061
3062 static __be32
3063 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3064 {
3065         struct svc_fh *fhp = getattr->ga_fhp;
3066         struct xdr_stream *xdr = &resp->xdr;
3067
3068         if (nfserr)
3069                 return nfserr;
3070
3071         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3072                                     getattr->ga_bmval,
3073                                     resp->rqstp, 0);
3074         return nfserr;
3075 }
3076
3077 static __be32
3078 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3079 {
3080         struct xdr_stream *xdr = &resp->xdr;
3081         struct svc_fh *fhp = *fhpp;
3082         unsigned int len;
3083         __be32 *p;
3084
3085         if (!nfserr) {
3086                 len = fhp->fh_handle.fh_size;
3087                 p = xdr_reserve_space(xdr, len + 4);
3088                 if (!p)
3089                         return nfserr_resource;
3090                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3091         }
3092         return nfserr;
3093 }
3094
3095 /*
3096 * Including all fields other than the name, a LOCK4denied structure requires
3097 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3098 */
3099 static __be32
3100 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3101 {
3102         struct xdr_netobj *conf = &ld->ld_owner;
3103         __be32 *p;
3104
3105 again:
3106         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3107         if (!p) {
3108                 /*
3109                  * Don't fail to return the result just because we can't
3110                  * return the conflicting open:
3111                  */
3112                 if (conf->len) {
3113                         kfree(conf->data);
3114                         conf->len = 0;
3115                         conf->data = NULL;
3116                         goto again;
3117                 }
3118                 return nfserr_resource;
3119         }
3120         p = xdr_encode_hyper(p, ld->ld_start);
3121         p = xdr_encode_hyper(p, ld->ld_length);
3122         *p++ = cpu_to_be32(ld->ld_type);
3123         if (conf->len) {
3124                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3125                 p = xdr_encode_opaque(p, conf->data, conf->len);
3126                 kfree(conf->data);
3127         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3128                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3129                 *p++ = cpu_to_be32(0); /* length of owner name */
3130         }
3131         return nfserr_denied;
3132 }
3133
3134 static __be32
3135 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3136 {
3137         struct xdr_stream *xdr = &resp->xdr;
3138
3139         if (!nfserr)
3140                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3141         else if (nfserr == nfserr_denied)
3142                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3143
3144         return nfserr;
3145 }
3146
3147 static __be32
3148 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3149 {
3150         struct xdr_stream *xdr = &resp->xdr;
3151
3152         if (nfserr == nfserr_denied)
3153                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3154         return nfserr;
3155 }
3156
3157 static __be32
3158 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3159 {
3160         struct xdr_stream *xdr = &resp->xdr;
3161
3162         if (!nfserr)
3163                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3164
3165         return nfserr;
3166 }
3167
3168
3169 static __be32
3170 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3171 {
3172         struct xdr_stream *xdr = &resp->xdr;
3173         __be32 *p;
3174
3175         if (!nfserr) {
3176                 p = xdr_reserve_space(xdr, 20);
3177                 if (!p)
3178                         return nfserr_resource;
3179                 p = encode_cinfo(p, &link->li_cinfo);
3180         }
3181         return nfserr;
3182 }
3183
3184
3185 static __be32
3186 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3187 {
3188         struct xdr_stream *xdr = &resp->xdr;
3189         __be32 *p;
3190
3191         if (nfserr)
3192                 goto out;
3193
3194         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3195         if (nfserr)
3196                 goto out;
3197         p = xdr_reserve_space(xdr, 40);
3198         if (!p)
3199                 return nfserr_resource;
3200         p = encode_cinfo(p, &open->op_cinfo);
3201         *p++ = cpu_to_be32(open->op_rflags);
3202         *p++ = cpu_to_be32(2);
3203         *p++ = cpu_to_be32(open->op_bmval[0]);
3204         *p++ = cpu_to_be32(open->op_bmval[1]);
3205         *p++ = cpu_to_be32(open->op_delegate_type);
3206
3207         switch (open->op_delegate_type) {
3208         case NFS4_OPEN_DELEGATE_NONE:
3209                 break;
3210         case NFS4_OPEN_DELEGATE_READ:
3211                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3212                 if (nfserr)
3213                         return nfserr;
3214                 p = xdr_reserve_space(xdr, 20);
3215                 if (!p)
3216                         return nfserr_resource;
3217                 *p++ = cpu_to_be32(open->op_recall);
3218
3219                 /*
3220                  * TODO: ACE's in delegations
3221                  */
3222                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3223                 *p++ = cpu_to_be32(0);
3224                 *p++ = cpu_to_be32(0);
3225                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3226                 break;
3227         case NFS4_OPEN_DELEGATE_WRITE:
3228                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3229                 if (nfserr)
3230                         return nfserr;
3231                 p = xdr_reserve_space(xdr, 32);
3232                 if (!p)
3233                         return nfserr_resource;
3234                 *p++ = cpu_to_be32(0);
3235
3236                 /*
3237                  * TODO: space_limit's in delegations
3238                  */
3239                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3240                 *p++ = cpu_to_be32(~(u32)0);
3241                 *p++ = cpu_to_be32(~(u32)0);
3242
3243                 /*
3244                  * TODO: ACE's in delegations
3245                  */
3246                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3247                 *p++ = cpu_to_be32(0);
3248                 *p++ = cpu_to_be32(0);
3249                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3250                 break;
3251         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3252                 switch (open->op_why_no_deleg) {
3253                 case WND4_CONTENTION:
3254                 case WND4_RESOURCE:
3255                         p = xdr_reserve_space(xdr, 8);
3256                         if (!p)
3257                                 return nfserr_resource;
3258                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3259                         /* deleg signaling not supported yet: */
3260                         *p++ = cpu_to_be32(0);
3261                         break;
3262                 default:
3263                         p = xdr_reserve_space(xdr, 4);
3264                         if (!p)
3265                                 return nfserr_resource;
3266                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3267                 }
3268                 break;
3269         default:
3270                 BUG();
3271         }
3272         /* XXX save filehandle here */
3273 out:
3274         return nfserr;
3275 }
3276
3277 static __be32
3278 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3279 {
3280         struct xdr_stream *xdr = &resp->xdr;
3281
3282         if (!nfserr)
3283                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3284
3285         return nfserr;
3286 }
3287
3288 static __be32
3289 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3290 {
3291         struct xdr_stream *xdr = &resp->xdr;
3292
3293         if (!nfserr)
3294                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3295
3296         return nfserr;
3297 }
3298
3299 static __be32 nfsd4_encode_splice_read(
3300                                 struct nfsd4_compoundres *resp,
3301                                 struct nfsd4_read *read,
3302                                 struct file *file, unsigned long maxcount)
3303 {
3304         struct xdr_stream *xdr = &resp->xdr;
3305         struct xdr_buf *buf = xdr->buf;
3306         u32 eof;
3307         int space_left;
3308         __be32 nfserr;
3309         __be32 *p = xdr->p - 2;
3310
3311         /* Make sure there will be room for padding if needed */
3312         if (xdr->end - xdr->p < 1)
3313                 return nfserr_resource;
3314
3315         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3316                                   read->rd_offset, &maxcount);
3317         if (nfserr) {
3318                 /*
3319                  * nfsd_splice_actor may have already messed with the
3320                  * page length; reset it so as not to confuse
3321                  * xdr_truncate_encode:
3322                  */
3323                 buf->page_len = 0;
3324                 return nfserr;
3325         }
3326
3327         eof = (read->rd_offset + maxcount >=
3328                d_inode(read->rd_fhp->fh_dentry)->i_size);
3329
3330         *(p++) = htonl(eof);
3331         *(p++) = htonl(maxcount);
3332
3333         buf->page_len = maxcount;
3334         buf->len += maxcount;
3335         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3336                                                         / PAGE_SIZE;
3337
3338         /* Use rest of head for padding and remaining ops: */
3339         buf->tail[0].iov_base = xdr->p;
3340         buf->tail[0].iov_len = 0;
3341         xdr->iov = buf->tail;
3342         if (maxcount&3) {
3343                 int pad = 4 - (maxcount&3);
3344
3345                 *(xdr->p++) = 0;
3346
3347                 buf->tail[0].iov_base += maxcount&3;
3348                 buf->tail[0].iov_len = pad;
3349                 buf->len += pad;
3350         }
3351
3352         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3353                                 buf->buflen - buf->len);
3354         buf->buflen = buf->len + space_left;
3355         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3356
3357         return 0;
3358 }
3359
3360 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3361                                  struct nfsd4_read *read,
3362                                  struct file *file, unsigned long maxcount)
3363 {
3364         struct xdr_stream *xdr = &resp->xdr;
3365         u32 eof;
3366         int v;
3367         int starting_len = xdr->buf->len - 8;
3368         long len;
3369         int thislen;
3370         __be32 nfserr;
3371         __be32 tmp;
3372         __be32 *p;
3373         u32 zzz = 0;
3374         int pad;
3375
3376         len = maxcount;
3377         v = 0;
3378
3379         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3380         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3381         WARN_ON_ONCE(!p);
3382         resp->rqstp->rq_vec[v].iov_base = p;
3383         resp->rqstp->rq_vec[v].iov_len = thislen;
3384         v++;
3385         len -= thislen;
3386
3387         while (len) {
3388                 thislen = min_t(long, len, PAGE_SIZE);
3389                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3390                 WARN_ON_ONCE(!p);
3391                 resp->rqstp->rq_vec[v].iov_base = p;
3392                 resp->rqstp->rq_vec[v].iov_len = thislen;
3393                 v++;
3394                 len -= thislen;
3395         }
3396         read->rd_vlen = v;
3397
3398         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3399                         read->rd_vlen, &maxcount);
3400         if (nfserr)
3401                 return nfserr;
3402         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3403
3404         eof = (read->rd_offset + maxcount >=
3405                d_inode(read->rd_fhp->fh_dentry)->i_size);
3406
3407         tmp = htonl(eof);
3408         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3409         tmp = htonl(maxcount);
3410         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3411
3412         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3413         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3414                                                                 &zzz, pad);
3415         return 0;
3416
3417 }
3418
3419 static __be32
3420 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3421                   struct nfsd4_read *read)
3422 {
3423         unsigned long maxcount;
3424         struct xdr_stream *xdr = &resp->xdr;
3425         struct file *file = read->rd_filp;
3426         struct svc_fh *fhp = read->rd_fhp;
3427         int starting_len = xdr->buf->len;
3428         struct raparms *ra;
3429         __be32 *p;
3430         __be32 err;
3431
3432         if (nfserr)
3433                 return nfserr;
3434
3435         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3436         if (!p) {
3437                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3438                 return nfserr_resource;
3439         }
3440         if (resp->xdr.buf->page_len && test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3441                 WARN_ON_ONCE(1);
3442                 return nfserr_resource;
3443         }
3444         xdr_commit_encode(xdr);
3445
3446         maxcount = svc_max_payload(resp->rqstp);
3447         maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len));
3448         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3449
3450         if (read->rd_filp)
3451                 err = nfsd_permission(resp->rqstp, fhp->fh_export,
3452                                 fhp->fh_dentry,
3453                                 NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE);
3454         else
3455                 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
3456                                                 &file, &ra);
3457         if (err)
3458                 goto err_truncate;
3459
3460         if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3461                 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
3462         else
3463                 err = nfsd4_encode_readv(resp, read, file, maxcount);
3464
3465         if (!read->rd_filp)
3466                 nfsd_put_tmp_read_open(file, ra);
3467
3468 err_truncate:
3469         if (err)
3470                 xdr_truncate_encode(xdr, starting_len);
3471         return err;
3472 }
3473
3474 static __be32
3475 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3476 {
3477         int maxcount;
3478         __be32 wire_count;
3479         int zero = 0;
3480         struct xdr_stream *xdr = &resp->xdr;
3481         int length_offset = xdr->buf->len;
3482         __be32 *p;
3483
3484         if (nfserr)
3485                 return nfserr;
3486
3487         p = xdr_reserve_space(xdr, 4);
3488         if (!p)
3489                 return nfserr_resource;
3490         maxcount = PAGE_SIZE;
3491
3492         p = xdr_reserve_space(xdr, maxcount);
3493         if (!p)
3494                 return nfserr_resource;
3495         /*
3496          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3497          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3498          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3499          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3500          */
3501         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3502                                                 (char *)p, &maxcount);
3503         if (nfserr == nfserr_isdir)
3504                 nfserr = nfserr_inval;
3505         if (nfserr) {
3506                 xdr_truncate_encode(xdr, length_offset);
3507                 return nfserr;
3508         }
3509
3510         wire_count = htonl(maxcount);
3511         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3512         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3513         if (maxcount & 3)
3514                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3515                                                 &zero, 4 - (maxcount&3));
3516         return 0;
3517 }
3518
3519 static __be32
3520 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3521 {
3522         int maxcount;
3523         int bytes_left;
3524         loff_t offset;
3525         __be64 wire_offset;
3526         struct xdr_stream *xdr = &resp->xdr;
3527         int starting_len = xdr->buf->len;
3528         __be32 *p;
3529
3530         if (nfserr)
3531                 return nfserr;
3532
3533         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3534         if (!p)
3535                 return nfserr_resource;
3536
3537         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3538         *p++ = cpu_to_be32(0);
3539         *p++ = cpu_to_be32(0);
3540         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3541                                 - (char *)resp->xdr.buf->head[0].iov_base;
3542
3543         /*
3544          * Number of bytes left for directory entries allowing for the
3545          * final 8 bytes of the readdir and a following failed op:
3546          */
3547         bytes_left = xdr->buf->buflen - xdr->buf->len
3548                         - COMPOUND_ERR_SLACK_SPACE - 8;
3549         if (bytes_left < 0) {
3550                 nfserr = nfserr_resource;
3551                 goto err_no_verf;
3552         }
3553         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3554         /*
3555          * Note the rfc defines rd_maxcount as the size of the
3556          * READDIR4resok structure, which includes the verifier above
3557          * and the 8 bytes encoded at the end of this function:
3558          */
3559         if (maxcount < 16) {
3560                 nfserr = nfserr_toosmall;
3561                 goto err_no_verf;
3562         }
3563         maxcount = min_t(int, maxcount-16, bytes_left);
3564
3565         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3566         if (!readdir->rd_dircount)
3567                 readdir->rd_dircount = INT_MAX;
3568
3569         readdir->xdr = xdr;
3570         readdir->rd_maxcount = maxcount;
3571         readdir->common.err = 0;
3572         readdir->cookie_offset = 0;
3573
3574         offset = readdir->rd_cookie;
3575         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3576                               &offset,
3577                               &readdir->common, nfsd4_encode_dirent);
3578         if (nfserr == nfs_ok &&
3579             readdir->common.err == nfserr_toosmall &&
3580             xdr->buf->len == starting_len + 8) {
3581                 /* nothing encoded; which limit did we hit?: */
3582                 if (maxcount - 16 < bytes_left)
3583                         /* It was the fault of rd_maxcount: */
3584                         nfserr = nfserr_toosmall;
3585                 else
3586                         /* We ran out of buffer space: */
3587                         nfserr = nfserr_resource;
3588         }
3589         if (nfserr)
3590                 goto err_no_verf;
3591
3592         if (readdir->cookie_offset) {
3593                 wire_offset = cpu_to_be64(offset);
3594                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3595                                                         &wire_offset, 8);
3596         }
3597
3598         p = xdr_reserve_space(xdr, 8);
3599         if (!p) {
3600                 WARN_ON_ONCE(1);
3601                 goto err_no_verf;
3602         }
3603         *p++ = 0;       /* no more entries */
3604         *p++ = htonl(readdir->common.err == nfserr_eof);
3605
3606         return 0;
3607 err_no_verf:
3608         xdr_truncate_encode(xdr, starting_len);
3609         return nfserr;
3610 }
3611
3612 static __be32
3613 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3614 {
3615         struct xdr_stream *xdr = &resp->xdr;
3616         __be32 *p;
3617
3618         if (!nfserr) {
3619                 p = xdr_reserve_space(xdr, 20);
3620                 if (!p)
3621                         return nfserr_resource;
3622                 p = encode_cinfo(p, &remove->rm_cinfo);
3623         }
3624         return nfserr;
3625 }
3626
3627 static __be32
3628 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3629 {
3630         struct xdr_stream *xdr = &resp->xdr;
3631         __be32 *p;
3632
3633         if (!nfserr) {
3634                 p = xdr_reserve_space(xdr, 40);
3635                 if (!p)
3636                         return nfserr_resource;
3637                 p = encode_cinfo(p, &rename->rn_sinfo);
3638                 p = encode_cinfo(p, &rename->rn_tinfo);
3639         }
3640         return nfserr;
3641 }
3642
3643 static __be32
3644 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3645                          __be32 nfserr, struct svc_export *exp)
3646 {
3647         u32 i, nflavs, supported;
3648         struct exp_flavor_info *flavs;
3649         struct exp_flavor_info def_flavs[2];
3650         __be32 *p, *flavorsp;
3651         static bool report = true;
3652
3653         if (nfserr)
3654                 goto out;
3655         nfserr = nfserr_resource;
3656         if (exp->ex_nflavors) {
3657                 flavs = exp->ex_flavors;
3658                 nflavs = exp->ex_nflavors;
3659         } else { /* Handling of some defaults in absence of real secinfo: */
3660                 flavs = def_flavs;
3661                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3662                         nflavs = 2;
3663                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3664                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3665                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3666                         nflavs = 1;
3667                         flavs[0].pseudoflavor
3668                                         = svcauth_gss_flavor(exp->ex_client);
3669                 } else {
3670                         nflavs = 1;
3671                         flavs[0].pseudoflavor
3672                                         = exp->ex_client->flavour->flavour;
3673                 }
3674         }
3675
3676         supported = 0;
3677         p = xdr_reserve_space(xdr, 4);
3678         if (!p)
3679                 goto out;
3680         flavorsp = p++;         /* to be backfilled later */
3681
3682         for (i = 0; i < nflavs; i++) {
3683                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3684                 struct rpcsec_gss_info info;
3685
3686                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3687                         supported++;
3688                         p = xdr_reserve_space(xdr, 4 + 4 +
3689                                               XDR_LEN(info.oid.len) + 4 + 4);
3690                         if (!p)
3691                                 goto out;
3692                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3693                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3694                         *p++ = cpu_to_be32(info.qop);
3695                         *p++ = cpu_to_be32(info.service);
3696                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3697                         supported++;
3698                         p = xdr_reserve_space(xdr, 4);
3699                         if (!p)
3700                                 goto out;
3701                         *p++ = cpu_to_be32(pf);
3702                 } else {
3703                         if (report)
3704                                 pr_warn("NFS: SECINFO: security flavor %u "
3705                                         "is not supported\n", pf);
3706                 }
3707         }
3708
3709         if (nflavs != supported)
3710                 report = false;
3711         *flavorsp = htonl(supported);
3712         nfserr = 0;
3713 out:
3714         if (exp)
3715                 exp_put(exp);
3716         return nfserr;
3717 }
3718
3719 static __be32
3720 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3721                      struct nfsd4_secinfo *secinfo)
3722 {
3723         struct xdr_stream *xdr = &resp->xdr;
3724
3725         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3726 }
3727
3728 static __be32
3729 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3730                      struct nfsd4_secinfo_no_name *secinfo)
3731 {
3732         struct xdr_stream *xdr = &resp->xdr;
3733
3734         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3735 }
3736
3737 /*
3738  * The SETATTR encode routine is special -- it always encodes a bitmap,
3739  * regardless of the error status.
3740  */
3741 static __be32
3742 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3743 {
3744         struct xdr_stream *xdr = &resp->xdr;
3745         __be32 *p;
3746
3747         p = xdr_reserve_space(xdr, 16);
3748         if (!p)
3749                 return nfserr_resource;
3750         if (nfserr) {
3751                 *p++ = cpu_to_be32(3);
3752                 *p++ = cpu_to_be32(0);
3753                 *p++ = cpu_to_be32(0);
3754                 *p++ = cpu_to_be32(0);
3755         }
3756         else {
3757                 *p++ = cpu_to_be32(3);
3758                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3759                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3760                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3761         }
3762         return nfserr;
3763 }
3764
3765 static __be32
3766 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3767 {
3768         struct xdr_stream *xdr = &resp->xdr;
3769         __be32 *p;
3770
3771         if (!nfserr) {
3772                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3773                 if (!p)
3774                         return nfserr_resource;
3775                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3776                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3777                                                 NFS4_VERIFIER_SIZE);
3778         }
3779         else if (nfserr == nfserr_clid_inuse) {
3780                 p = xdr_reserve_space(xdr, 8);
3781                 if (!p)
3782                         return nfserr_resource;
3783                 *p++ = cpu_to_be32(0);
3784                 *p++ = cpu_to_be32(0);
3785         }
3786         return nfserr;
3787 }
3788
3789 static __be32
3790 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3791 {
3792         struct xdr_stream *xdr = &resp->xdr;
3793         __be32 *p;
3794
3795         if (!nfserr) {
3796                 p = xdr_reserve_space(xdr, 16);
3797                 if (!p)
3798                         return nfserr_resource;
3799                 *p++ = cpu_to_be32(write->wr_bytes_written);
3800                 *p++ = cpu_to_be32(write->wr_how_written);
3801                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3802                                                         NFS4_VERIFIER_SIZE);
3803         }
3804         return nfserr;
3805 }
3806
3807 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3808         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3809               1 << (OP_EXCHANGE_ID - 32) |
3810               1 << (OP_CREATE_SESSION - 32) |
3811               1 << (OP_DESTROY_SESSION - 32) |
3812               1 << (OP_DESTROY_CLIENTID - 32)
3813 };
3814
3815 static __be32
3816 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3817                          struct nfsd4_exchange_id *exid)
3818 {
3819         struct xdr_stream *xdr = &resp->xdr;
3820         __be32 *p;
3821         char *major_id;
3822         char *server_scope;
3823         int major_id_sz;
3824         int server_scope_sz;
3825         uint64_t minor_id = 0;
3826
3827         if (nfserr)
3828                 return nfserr;
3829
3830         major_id = utsname()->nodename;
3831         major_id_sz = strlen(major_id);
3832         server_scope = utsname()->nodename;
3833         server_scope_sz = strlen(server_scope);
3834
3835         p = xdr_reserve_space(xdr,
3836                 8 /* eir_clientid */ +
3837                 4 /* eir_sequenceid */ +
3838                 4 /* eir_flags */ +
3839                 4 /* spr_how */);
3840         if (!p)
3841                 return nfserr_resource;
3842
3843         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3844         *p++ = cpu_to_be32(exid->seqid);
3845         *p++ = cpu_to_be32(exid->flags);
3846
3847         *p++ = cpu_to_be32(exid->spa_how);
3848
3849         switch (exid->spa_how) {
3850         case SP4_NONE:
3851                 break;
3852         case SP4_MACH_CRED:
3853                 /* spo_must_enforce, spo_must_allow */
3854                 p = xdr_reserve_space(xdr, 16);
3855                 if (!p)
3856                         return nfserr_resource;
3857
3858                 /* spo_must_enforce bitmap: */
3859                 *p++ = cpu_to_be32(2);
3860                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3861                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3862                 /* empty spo_must_allow bitmap: */
3863                 *p++ = cpu_to_be32(0);
3864
3865                 break;
3866         default:
3867                 WARN_ON_ONCE(1);
3868         }
3869
3870         p = xdr_reserve_space(xdr,
3871                 8 /* so_minor_id */ +
3872                 4 /* so_major_id.len */ +
3873                 (XDR_QUADLEN(major_id_sz) * 4) +
3874                 4 /* eir_server_scope.len */ +
3875                 (XDR_QUADLEN(server_scope_sz) * 4) +
3876                 4 /* eir_server_impl_id.count (0) */);
3877         if (!p)
3878                 return nfserr_resource;
3879
3880         /* The server_owner struct */
3881         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3882         /* major id */
3883         p = xdr_encode_opaque(p, major_id, major_id_sz);
3884
3885         /* Server scope */
3886         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3887
3888         /* Implementation id */
3889         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3890         return 0;
3891 }
3892
3893 static __be32
3894 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3895                             struct nfsd4_create_session *sess)
3896 {
3897         struct xdr_stream *xdr = &resp->xdr;
3898         __be32 *p;
3899
3900         if (nfserr)
3901                 return nfserr;
3902
3903         p = xdr_reserve_space(xdr, 24);
3904         if (!p)
3905                 return nfserr_resource;
3906         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3907                                         NFS4_MAX_SESSIONID_LEN);
3908         *p++ = cpu_to_be32(sess->seqid);
3909         *p++ = cpu_to_be32(sess->flags);
3910
3911         p = xdr_reserve_space(xdr, 28);
3912         if (!p)
3913                 return nfserr_resource;
3914         *p++ = cpu_to_be32(0); /* headerpadsz */
3915         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3916         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3917         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3918         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3919         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3920         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3921
3922         if (sess->fore_channel.nr_rdma_attrs) {
3923                 p = xdr_reserve_space(xdr, 4);
3924                 if (!p)
3925                         return nfserr_resource;
3926                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3927         }
3928
3929         p = xdr_reserve_space(xdr, 28);
3930         if (!p)
3931                 return nfserr_resource;
3932         *p++ = cpu_to_be32(0); /* headerpadsz */
3933         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3934         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3935         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3936         *p++ = cpu_to_be32(sess->back_channel.maxops);
3937         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3938         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3939
3940         if (sess->back_channel.nr_rdma_attrs) {
3941                 p = xdr_reserve_space(xdr, 4);
3942                 if (!p)
3943                         return nfserr_resource;
3944                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3945         }
3946         return 0;
3947 }
3948
3949 static __be32
3950 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3951                       struct nfsd4_sequence *seq)
3952 {
3953         struct xdr_stream *xdr = &resp->xdr;
3954         __be32 *p;
3955
3956         if (nfserr)
3957                 return nfserr;
3958
3959         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3960         if (!p)
3961                 return nfserr_resource;
3962         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
3963                                         NFS4_MAX_SESSIONID_LEN);
3964         *p++ = cpu_to_be32(seq->seqid);
3965         *p++ = cpu_to_be32(seq->slotid);
3966         /* Note slotid's are numbered from zero: */
3967         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
3968         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
3969         *p++ = cpu_to_be32(seq->status_flags);
3970
3971         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3972         return 0;
3973 }
3974
3975 static __be32
3976 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3977                           struct nfsd4_test_stateid *test_stateid)
3978 {
3979         struct xdr_stream *xdr = &resp->xdr;
3980         struct nfsd4_test_stateid_id *stateid, *next;
3981         __be32 *p;
3982
3983         if (nfserr)
3984                 return nfserr;
3985
3986         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3987         if (!p)
3988                 return nfserr_resource;
3989         *p++ = htonl(test_stateid->ts_num_ids);
3990
3991         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3992                 *p++ = stateid->ts_id_status;
3993         }
3994
3995         return nfserr;
3996 }
3997
3998 #ifdef CONFIG_NFSD_PNFS
3999 static __be32
4000 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4001                 struct nfsd4_getdeviceinfo *gdev)
4002 {
4003         struct xdr_stream *xdr = &resp->xdr;
4004         const struct nfsd4_layout_ops *ops =
4005                 nfsd4_layout_ops[gdev->gd_layout_type];
4006         u32 starting_len = xdr->buf->len, needed_len;
4007         __be32 *p;
4008
4009         dprintk("%s: err %d\n", __func__, nfserr);
4010         if (nfserr)
4011                 goto out;
4012
4013         nfserr = nfserr_resource;
4014         p = xdr_reserve_space(xdr, 4);
4015         if (!p)
4016                 goto out;
4017
4018         *p++ = cpu_to_be32(gdev->gd_layout_type);
4019
4020         /* If maxcount is 0 then just update notifications */
4021         if (gdev->gd_maxcount != 0) {
4022                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4023                 if (nfserr) {
4024                         /*
4025                          * We don't bother to burden the layout drivers with
4026                          * enforcing gd_maxcount, just tell the client to
4027                          * come back with a bigger buffer if it's not enough.
4028                          */
4029                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4030                                 goto toosmall;
4031                         goto out;
4032                 }
4033         }
4034
4035         nfserr = nfserr_resource;
4036         if (gdev->gd_notify_types) {
4037                 p = xdr_reserve_space(xdr, 4 + 4);
4038                 if (!p)
4039                         goto out;
4040                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4041                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4042         } else {
4043                 p = xdr_reserve_space(xdr, 4);
4044                 if (!p)
4045                         goto out;
4046                 *p++ = 0;
4047         }
4048
4049         nfserr = 0;
4050 out:
4051         kfree(gdev->gd_device);
4052         dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4053         return nfserr;
4054
4055 toosmall:
4056         dprintk("%s: maxcount too small\n", __func__);
4057         needed_len = xdr->buf->len + 4 /* notifications */;
4058         xdr_truncate_encode(xdr, starting_len);
4059         p = xdr_reserve_space(xdr, 4);
4060         if (!p) {
4061                 nfserr = nfserr_resource;
4062         } else {
4063                 *p++ = cpu_to_be32(needed_len);
4064                 nfserr = nfserr_toosmall;
4065         }
4066         goto out;
4067 }
4068
4069 static __be32
4070 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4071                 struct nfsd4_layoutget *lgp)
4072 {
4073         struct xdr_stream *xdr = &resp->xdr;
4074         const struct nfsd4_layout_ops *ops =
4075                 nfsd4_layout_ops[lgp->lg_layout_type];
4076         __be32 *p;
4077
4078         dprintk("%s: err %d\n", __func__, nfserr);
4079         if (nfserr)
4080                 goto out;
4081
4082         nfserr = nfserr_resource;
4083         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4084         if (!p)
4085                 goto out;
4086
4087         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4088         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4089         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4090                                     sizeof(stateid_opaque_t));
4091
4092         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4093         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4094         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4095         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4096         *p++ = cpu_to_be32(lgp->lg_layout_type);
4097
4098         nfserr = ops->encode_layoutget(xdr, lgp);
4099 out:
4100         kfree(lgp->lg_content);
4101         return nfserr;
4102 }
4103
4104 static __be32
4105 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4106                           struct nfsd4_layoutcommit *lcp)
4107 {
4108         struct xdr_stream *xdr = &resp->xdr;
4109         __be32 *p;
4110
4111         if (nfserr)
4112                 return nfserr;
4113
4114         p = xdr_reserve_space(xdr, 4);
4115         if (!p)
4116                 return nfserr_resource;
4117         *p++ = cpu_to_be32(lcp->lc_size_chg);
4118         if (lcp->lc_size_chg) {
4119                 p = xdr_reserve_space(xdr, 8);
4120                 if (!p)
4121                         return nfserr_resource;
4122                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4123         }
4124
4125         return nfs_ok;
4126 }
4127
4128 static __be32
4129 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4130                 struct nfsd4_layoutreturn *lrp)
4131 {
4132         struct xdr_stream *xdr = &resp->xdr;
4133         __be32 *p;
4134
4135         if (nfserr)
4136                 return nfserr;
4137
4138         p = xdr_reserve_space(xdr, 4);
4139         if (!p)
4140                 return nfserr_resource;
4141         *p++ = cpu_to_be32(lrp->lrs_present);
4142         if (lrp->lrs_present)
4143                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4144         return nfs_ok;
4145 }
4146 #endif /* CONFIG_NFSD_PNFS */
4147
4148 static __be32
4149 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4150                   struct nfsd4_seek *seek)
4151 {
4152         __be32 *p;
4153
4154         if (nfserr)
4155                 return nfserr;
4156
4157         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4158         *p++ = cpu_to_be32(seek->seek_eof);
4159         p = xdr_encode_hyper(p, seek->seek_pos);
4160
4161         return nfserr;
4162 }
4163
4164 static __be32
4165 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4166 {
4167         return nfserr;
4168 }
4169
4170 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4171
4172 /*
4173  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4174  * since we don't need to filter out obsolete ops as this is
4175  * done in the decoding phase.
4176  */
4177 static nfsd4_enc nfsd4_enc_ops[] = {
4178         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4179         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4180         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4181         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4182         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4183         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4184         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4185         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4186         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4187         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4188         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4189         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4190         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4191         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4192         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4193         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4194         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4195         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4196         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4197         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4198         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4199         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4200         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4201         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4202         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4203         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4204         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4205         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4206         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4207         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4208         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4209         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4210         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4211         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4212         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4213         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4214         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4215
4216         /* NFSv4.1 operations */
4217         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4218         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4219         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4220         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4221         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4222         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4223         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4224 #ifdef CONFIG_NFSD_PNFS
4225         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4226         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4227         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4228         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4229         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4230 #else
4231         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4232         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4233         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4234         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4235         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4236 #endif
4237         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4238         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4239         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4240         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4241         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4242         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4243         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4244
4245         /* NFSv4.2 operations */
4246         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4247         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_noop,
4248         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4249         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4250         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4251         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4252         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4253         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4254         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4255         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4256         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4257         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4258 };
4259
4260 /*
4261  * Calculate whether we still have space to encode repsize bytes.
4262  * There are two considerations:
4263  *     - For NFS versions >=4.1, the size of the reply must stay within
4264  *       session limits
4265  *     - For all NFS versions, we must stay within limited preallocated
4266  *       buffer space.
4267  *
4268  * This is called before the operation is processed, so can only provide
4269  * an upper estimate.  For some nonidempotent operations (such as
4270  * getattr), it's not necessarily a problem if that estimate is wrong,
4271  * as we can fail it after processing without significant side effects.
4272  */
4273 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4274 {
4275         struct xdr_buf *buf = &resp->rqstp->rq_res;
4276         struct nfsd4_slot *slot = resp->cstate.slot;
4277
4278         if (buf->len + respsize <= buf->buflen)
4279                 return nfs_ok;
4280         if (!nfsd4_has_session(&resp->cstate))
4281                 return nfserr_resource;
4282         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4283                 WARN_ON_ONCE(1);
4284                 return nfserr_rep_too_big_to_cache;
4285         }
4286         return nfserr_rep_too_big;
4287 }
4288
4289 void
4290 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4291 {
4292         struct xdr_stream *xdr = &resp->xdr;
4293         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4294         struct svc_rqst *rqstp = resp->rqstp;
4295         int post_err_offset;
4296         nfsd4_enc encoder;
4297         __be32 *p;
4298
4299         p = xdr_reserve_space(xdr, 8);
4300         if (!p) {
4301                 WARN_ON_ONCE(1);
4302                 return;
4303         }
4304         *p++ = cpu_to_be32(op->opnum);
4305         post_err_offset = xdr->buf->len;
4306
4307         if (op->opnum == OP_ILLEGAL)
4308                 goto status;
4309         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4310                !nfsd4_enc_ops[op->opnum]);
4311         encoder = nfsd4_enc_ops[op->opnum];
4312         op->status = encoder(resp, op->status, &op->u);
4313         xdr_commit_encode(xdr);
4314
4315         /* nfsd4_check_resp_size guarantees enough room for error status */
4316         if (!op->status) {
4317                 int space_needed = 0;
4318                 if (!nfsd4_last_compound_op(rqstp))
4319                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4320                 op->status = nfsd4_check_resp_size(resp, space_needed);
4321         }
4322         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4323                 struct nfsd4_slot *slot = resp->cstate.slot;
4324
4325                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4326                         op->status = nfserr_rep_too_big_to_cache;
4327                 else
4328                         op->status = nfserr_rep_too_big;
4329         }
4330         if (op->status == nfserr_resource ||
4331             op->status == nfserr_rep_too_big ||
4332             op->status == nfserr_rep_too_big_to_cache) {
4333                 /*
4334                  * The operation may have already been encoded or
4335                  * partially encoded.  No op returns anything additional
4336                  * in the case of one of these three errors, so we can
4337                  * just truncate back to after the status.  But it's a
4338                  * bug if we had to do this on a non-idempotent op:
4339                  */
4340                 warn_on_nonidempotent_op(op);
4341                 xdr_truncate_encode(xdr, post_err_offset);
4342         }
4343         if (so) {
4344                 int len = xdr->buf->len - post_err_offset;
4345
4346                 so->so_replay.rp_status = op->status;
4347                 so->so_replay.rp_buflen = len;
4348                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4349                                                 so->so_replay.rp_buf, len);
4350         }
4351 status:
4352         /* Note that op->status is already in network byte order: */
4353         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4354 }
4355
4356 /*
4357  * Encode the reply stored in the stateowner reply cache
4358  *
4359  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4360  * previously sent already encoded operation.
4361  */
4362 void
4363 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4364 {
4365         __be32 *p;
4366         struct nfs4_replay *rp = op->replay;
4367
4368         BUG_ON(!rp);
4369
4370         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4371         if (!p) {
4372                 WARN_ON_ONCE(1);
4373                 return;
4374         }
4375         *p++ = cpu_to_be32(op->opnum);
4376         *p++ = rp->rp_status;  /* already xdr'ed */
4377
4378         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4379 }
4380
4381 int
4382 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4383 {
4384         return xdr_ressize_check(rqstp, p);
4385 }
4386
4387 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4388 {
4389         struct svc_rqst *rqstp = rq;
4390         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4391
4392         if (args->ops != args->iops) {
4393                 kfree(args->ops);
4394                 args->ops = args->iops;
4395         }
4396         kfree(args->tmpp);
4397         args->tmpp = NULL;
4398         while (args->to_free) {
4399                 struct svcxdr_tmpbuf *tb = args->to_free;
4400                 args->to_free = tb->next;
4401                 kfree(tb);
4402         }
4403         return 1;
4404 }
4405
4406 int
4407 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4408 {
4409         if (rqstp->rq_arg.head[0].iov_len % 4) {
4410                 /* client is nuts */
4411                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4412                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4413                 return 0;
4414         }
4415         args->p = p;
4416         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4417         args->pagelist = rqstp->rq_arg.pages;
4418         args->pagelen = rqstp->rq_arg.page_len;
4419         args->tmpp = NULL;
4420         args->to_free = NULL;
4421         args->ops = args->iops;
4422         args->rqstp = rqstp;
4423
4424         return !nfsd4_decode_compound(args);
4425 }
4426
4427 int
4428 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4429 {
4430         /*
4431          * All that remains is to write the tag and operation count...
4432          */
4433         struct xdr_buf *buf = resp->xdr.buf;
4434
4435         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4436                                  buf->tail[0].iov_len);
4437
4438         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4439
4440         p = resp->tagp;
4441         *p++ = htonl(resp->taglen);
4442         memcpy(p, resp->tag, resp->taglen);
4443         p += XDR_QUADLEN(resp->taglen);
4444         *p++ = htonl(resp->opcnt);
4445
4446         nfsd4_sequence_done(resp);
4447         return 1;
4448 }
4449
4450 /*
4451  * Local variables:
4452  *  c-basic-offset: 8
4453  * End:
4454  */