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/file.h>
  37 #include <linux/slab.h>
  38 #include <linux/namei.h>
  39 #include <linux/statfs.h>
  40 #include <linux/utsname.h>
  41 #include <linux/pagemap.h>
  42 #include <linux/sunrpc/svcauth_gss.h>
  43
  44 #include "idmap.h"
  45 #include "acl.h"
  46 #include "xdr4.h"
  47 #include "vfs.h"
  48 #include "state.h"
  49 #include "cache.h"
  50 #include "netns.h"
  51 #include "pnfs.h"
  52
  53 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  54 #include <linux/security.h>
  55 #endif
  56
  57
  58 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  59
  60 /*
  61  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  62  * directory in order to indicate to the client that a filesystem boundary is present
  63  * We use a fixed fsid for a referral
  64  */
  65 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  66 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  67
  68 static __be32
  69 check_filename(char *str, int len)
  70 {
  71         int i;
  72
  73         if (len == 0)
  74                 return nfserr_inval;
  75         if (isdotent(str, len))
  76                 return nfserr_badname;
  77         for (i = 0; i < len; i++)
  78                 if (str[i] == '/')
  79                         return nfserr_badname;
  80         return 0;
  81 }
  82
  83 #define DECODE_HEAD                             \
  84         __be32 *p;                              \
  85         __be32 status
  86 #define DECODE_TAIL                             \
  87         status = 0;                             \
  88 out:                                            \
  89         return status;                          \
  90 xdr_error:                                      \
  91         dprintk("NFSD: xdr error (%s:%d)\n",    \
  92                         __FILE__, __LINE__);    \
  93         status = nfserr_bad_xdr;                \
  94         goto out
  95
  96 #define READMEM(x,nbytes) do {                  \
  97         x = (char *)p;                          \
  98         p += XDR_QUADLEN(nbytes);               \
  99 } while (0)
 100 #define SAVEMEM(x,nbytes) do {                  \
 101         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 102                 savemem(argp, p, nbytes) :      \
 103                 (char *)p)) {                   \
 104                 dprintk("NFSD: xdr error (%s:%d)\n", \
 105                                 __FILE__, __LINE__); \
 106                 goto xdr_error;                 \
 107                 }                               \
 108         p += XDR_QUADLEN(nbytes);               \
 109 } while (0)
 110 #define COPYMEM(x,nbytes) do {                  \
 111         memcpy((x), p, nbytes);                 \
 112         p += XDR_QUADLEN(nbytes);               \
 113 } while (0)
 114
 115 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 116 #define READ_BUF(nbytes)  do {                  \
 117         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 118                 p = argp->p;                    \
 119                 argp->p += XDR_QUADLEN(nbytes); \
 120         } else if (!(p = read_buf(argp, nbytes))) { \
 121                 dprintk("NFSD: xdr error (%s:%d)\n", \
 122                                 __FILE__, __LINE__); \
 123                 goto xdr_error;                 \
 124         }                                       \
 125 } while (0)
 126
 127 static void next_decode_page(struct nfsd4_compoundargs *argp)
 128 {
 129         argp->p = page_address(argp->pagelist[0]);
 130         argp->pagelist++;
 131         if (argp->pagelen < PAGE_SIZE) {
 132                 argp->end = argp->p + (argp->pagelen>>2);
 133                 argp->pagelen = 0;
 134         } else {
 135                 argp->end = argp->p + (PAGE_SIZE>>2);
 136                 argp->pagelen -= PAGE_SIZE;
 137         }
 138 }
 139
 140 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 141 {
 142         /* We want more bytes than seem to be available.
 143          * Maybe we need a new page, maybe we have just run out
 144          */
 145         unsigned int avail = (char *)argp->end - (char *)argp->p;
 146         __be32 *p;
 147         if (avail + argp->pagelen < nbytes)
 148                 return NULL;
 149         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 150                 return NULL;
 151         /* ok, we can do it with the current plus the next page */
 152         if (nbytes <= sizeof(argp->tmp))
 153                 p = argp->tmp;
 154         else {
 155                 kfree(argp->tmpp);
 156                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 157                 if (!p)
 158                         return NULL;
 159
 160         }
 161         /*
 162          * The following memcpy is safe because read_buf is always
 163          * called with nbytes > avail, and the two cases above both
 164          * guarantee p points to at least nbytes bytes.
 165          */
 166         memcpy(p, argp->p, avail);
 167         next_decode_page(argp);
 168         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 169         argp->p += XDR_QUADLEN(nbytes - avail);
 170         return p;
 171 }
 172
 173 static int zero_clientid(clientid_t *clid)
 174 {
 175         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 176 }
 177
 178 /**
 179  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 180  * @argp: NFSv4 compound argument structure
 181  * @p: pointer to be freed (with kfree())
 182  *
 183  * Marks @p to be freed when processing the compound operation
 184  * described in @argp finishes.
 185  */
 186 static void *
 187 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 188 {
 189         struct svcxdr_tmpbuf *tb;
 190
 191         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 192         if (!tb)
 193                 return NULL;
 194         tb->next = argp->to_free;
 195         argp->to_free = tb;
 196         return tb->buf;
 197 }
 198
 199 /*
 200  * For xdr strings that need to be passed to other kernel api's
 201  * as null-terminated strings.
 202  *
 203  * Note null-terminating in place usually isn't safe since the
 204  * buffer might end on a page boundary.
 205  */
 206 static char *
 207 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 208 {
 209         char *p = svcxdr_tmpalloc(argp, len + 1);
 210
 211         if (!p)
 212                 return NULL;
 213         memcpy(p, buf, len);
 214         p[len] = '\0';
 215         return p;
 216 }
 217
 218 /**
 219  * savemem - duplicate a chunk of memory for later processing
 220  * @argp: NFSv4 compound argument structure to be freed with
 221  * @p: pointer to be duplicated
 222  * @nbytes: length to be duplicated
 223  *
 224  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 225  * that are preserved until processing of the NFSv4 compound
 226  * operation described by @argp finishes.
 227  */
 228 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 229 {
 230         void *ret;
 231
 232         ret = svcxdr_tmpalloc(argp, nbytes);
 233         if (!ret)
 234                 return NULL;
 235         memcpy(ret, p, nbytes);
 236         return ret;
 237 }
 238
 239 /*
 240  * We require the high 32 bits of 'seconds' to be 0, and
 241  * we ignore all 32 bits of 'nseconds'.
 242  */
 243 static __be32
 244 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
 245 {
 246         DECODE_HEAD;
 247         u64 sec;
 248
 249         READ_BUF(12);
 250         p = xdr_decode_hyper(p, &sec);
 251         tv->tv_sec = sec;
 252         tv->tv_nsec = be32_to_cpup(p++);
 253         if (tv->tv_nsec >= (u32)1000000000)
 254                 return nfserr_inval;
 255
 256         DECODE_TAIL;
 257 }
 258
 259 static __be32
 260 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 261 {
 262         u32 bmlen;
 263         DECODE_HEAD;
 264
 265         bmval[0] = 0;
 266         bmval[1] = 0;
 267         bmval[2] = 0;
 268
 269         READ_BUF(4);
 270         bmlen = be32_to_cpup(p++);
 271         if (bmlen > 1000)
 272                 goto xdr_error;
 273
 274         READ_BUF(bmlen << 2);
 275         if (bmlen > 0)
 276                 bmval[0] = be32_to_cpup(p++);
 277         if (bmlen > 1)
 278                 bmval[1] = be32_to_cpup(p++);
 279         if (bmlen > 2)
 280                 bmval[2] = be32_to_cpup(p++);
 281
 282         DECODE_TAIL;
 283 }
 284
 285 static __be32
 286 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 287                    struct iattr *iattr, struct nfs4_acl **acl,
 288                    struct xdr_netobj *label)
 289 {
 290         int expected_len, len = 0;
 291         u32 dummy32;
 292         char *buf;
 293
 294         DECODE_HEAD;
 295         iattr->ia_valid = 0;
 296         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 297                 return status;
 298
 299         READ_BUF(4);
 300         expected_len = be32_to_cpup(p++);
 301
 302         if (bmval[0] & FATTR4_WORD0_SIZE) {
 303                 READ_BUF(8);
 304                 len += 8;
 305                 p = xdr_decode_hyper(p, &iattr->ia_size);
 306                 iattr->ia_valid |= ATTR_SIZE;
 307         }
 308         if (bmval[0] & FATTR4_WORD0_ACL) {
 309                 u32 nace;
 310                 struct nfs4_ace *ace;
 311
 312                 READ_BUF(4); len += 4;
 313                 nace = be32_to_cpup(p++);
 314
 315                 if (nace > NFS4_ACL_MAX)
 316                         return nfserr_fbig;
 317
 318                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
 319                 if (*acl == NULL)
 320                         return nfserr_jukebox;
 321
 322                 (*acl)->naces = nace;
 323                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 324                         READ_BUF(16); len += 16;
 325                         ace->type = be32_to_cpup(p++);
 326                         ace->flag = be32_to_cpup(p++);
 327                         ace->access_mask = be32_to_cpup(p++);
 328                         dummy32 = be32_to_cpup(p++);
 329                         READ_BUF(dummy32);
 330                         len += XDR_QUADLEN(dummy32) << 2;
 331                         READMEM(buf, dummy32);
 332                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 333                         status = nfs_ok;
 334                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 335                                 ;
 336                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 337                                 status = nfsd_map_name_to_gid(argp->rqstp,
 338                                                 buf, dummy32, &ace->who_gid);
 339                         else
 340                                 status = nfsd_map_name_to_uid(argp->rqstp,
 341                                                 buf, dummy32, &ace->who_uid);
 342                         if (status)
 343                                 return status;
 344                 }
 345         } else
 346                 *acl = NULL;
 347         if (bmval[1] & FATTR4_WORD1_MODE) {
 348                 READ_BUF(4);
 349                 len += 4;
 350                 iattr->ia_mode = be32_to_cpup(p++);
 351                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 352                 iattr->ia_valid |= ATTR_MODE;
 353         }
 354         if (bmval[1] & FATTR4_WORD1_OWNER) {
 355                 READ_BUF(4);
 356                 len += 4;
 357                 dummy32 = be32_to_cpup(p++);
 358                 READ_BUF(dummy32);
 359                 len += (XDR_QUADLEN(dummy32) << 2);
 360                 READMEM(buf, dummy32);
 361                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 362                         return status;
 363                 iattr->ia_valid |= ATTR_UID;
 364         }
 365         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 366                 READ_BUF(4);
 367                 len += 4;
 368                 dummy32 = be32_to_cpup(p++);
 369                 READ_BUF(dummy32);
 370                 len += (XDR_QUADLEN(dummy32) << 2);
 371                 READMEM(buf, dummy32);
 372                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 373                         return status;
 374                 iattr->ia_valid |= ATTR_GID;
 375         }
 376         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 377                 READ_BUF(4);
 378                 len += 4;
 379                 dummy32 = be32_to_cpup(p++);
 380                 switch (dummy32) {
 381                 case NFS4_SET_TO_CLIENT_TIME:
 382                         len += 12;
 383                         status = nfsd4_decode_time(argp, &iattr->ia_atime);
 384                         if (status)
 385                                 return status;
 386                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 387                         break;
 388                 case NFS4_SET_TO_SERVER_TIME:
 389                         iattr->ia_valid |= ATTR_ATIME;
 390                         break;
 391                 default:
 392                         goto xdr_error;
 393                 }
 394         }
 395         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 396                 READ_BUF(4);
 397                 len += 4;
 398                 dummy32 = be32_to_cpup(p++);
 399                 switch (dummy32) {
 400                 case NFS4_SET_TO_CLIENT_TIME:
 401                         len += 12;
 402                         status = nfsd4_decode_time(argp, &iattr->ia_mtime);
 403                         if (status)
 404                                 return status;
 405                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 406                         break;
 407                 case NFS4_SET_TO_SERVER_TIME:
 408                         iattr->ia_valid |= ATTR_MTIME;
 409                         break;
 410                 default:
 411                         goto xdr_error;
 412                 }
 413         }
 414
 415         label->len = 0;
 416 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 417         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 418                 READ_BUF(4);
 419                 len += 4;
 420                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 421                 READ_BUF(4);
 422                 len += 4;
 423                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 424                 READ_BUF(4);
 425                 len += 4;
 426                 dummy32 = be32_to_cpup(p++);
 427                 READ_BUF(dummy32);
 428                 if (dummy32 > NFS4_MAXLABELLEN)
 429                         return nfserr_badlabel;
 430                 len += (XDR_QUADLEN(dummy32) << 2);
 431                 READMEM(buf, dummy32);
 432                 label->len = dummy32;
 433                 label->data = svcxdr_dupstr(argp, buf, dummy32);
 434                 if (!label->data)
 435                         return nfserr_jukebox;
 436         }
 437 #endif
 438
 439         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 440             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 441             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 442                 READ_BUF(expected_len - len);
 443         else if (len != expected_len)
 444                 goto xdr_error;
 445
 446         DECODE_TAIL;
 447 }
 448
 449 static __be32
 450 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 451 {
 452         DECODE_HEAD;
 453
 454         READ_BUF(sizeof(stateid_t));
 455         sid->si_generation = be32_to_cpup(p++);
 456         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 457
 458         DECODE_TAIL;
 459 }
 460
 461 static __be32
 462 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 463 {
 464         DECODE_HEAD;
 465
 466         READ_BUF(4);
 467         access->ac_req_access = be32_to_cpup(p++);
 468
 469         DECODE_TAIL;
 470 }
 471
 472 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 473 {
 474         DECODE_HEAD;
 475         u32 dummy, uid, gid;
 476         char *machine_name;
 477         int i;
 478         int nr_secflavs;
 479
 480         /* callback_sec_params4 */
 481         READ_BUF(4);
 482         nr_secflavs = be32_to_cpup(p++);
 483         if (nr_secflavs)
 484                 cbs->flavor = (u32)(-1);
 485         else
 486                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 487                 cbs->flavor = 0;
 488         for (i = 0; i < nr_secflavs; ++i) {
 489                 READ_BUF(4);
 490                 dummy = be32_to_cpup(p++);
 491                 switch (dummy) {
 492                 case RPC_AUTH_NULL:
 493                         /* Nothing to read */
 494                         if (cbs->flavor == (u32)(-1))
 495                                 cbs->flavor = RPC_AUTH_NULL;
 496                         break;
 497                 case RPC_AUTH_UNIX:
 498                         READ_BUF(8);
 499                         /* stamp */
 500                         dummy = be32_to_cpup(p++);
 501
 502                         /* machine name */
 503                         dummy = be32_to_cpup(p++);
 504                         READ_BUF(dummy);
 505                         SAVEMEM(machine_name, dummy);
 506
 507                         /* uid, gid */
 508                         READ_BUF(8);
 509                         uid = be32_to_cpup(p++);
 510                         gid = be32_to_cpup(p++);
 511
 512                         /* more gids */
 513                         READ_BUF(4);
 514                         dummy = be32_to_cpup(p++);
 515                         READ_BUF(dummy * 4);
 516                         if (cbs->flavor == (u32)(-1)) {
 517                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 518                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 519                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 520                                         cbs->uid = kuid;
 521                                         cbs->gid = kgid;
 522                                         cbs->flavor = RPC_AUTH_UNIX;
 523                                 } else {
 524                                         dprintk("RPC_AUTH_UNIX with invalid"
 525                                                 "uid or gid ignoring!\n");
 526                                 }
 527                         }
 528                         break;
 529                 case RPC_AUTH_GSS:
 530                         dprintk("RPC_AUTH_GSS callback secflavor "
 531                                 "not supported!\n");
 532                         READ_BUF(8);
 533                         /* gcbp_service */
 534                         dummy = be32_to_cpup(p++);
 535                         /* gcbp_handle_from_server */
 536                         dummy = be32_to_cpup(p++);
 537                         READ_BUF(dummy);
 538                         p += XDR_QUADLEN(dummy);
 539                         /* gcbp_handle_from_client */
 540                         READ_BUF(4);
 541                         dummy = be32_to_cpup(p++);
 542                         READ_BUF(dummy);
 543                         break;
 544                 default:
 545                         dprintk("Illegal callback secflavor\n");
 546                         return nfserr_inval;
 547                 }
 548         }
 549         DECODE_TAIL;
 550 }
 551
 552 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 553 {
 554         DECODE_HEAD;
 555
 556         READ_BUF(4);
 557         bc->bc_cb_program = be32_to_cpup(p++);
 558         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 559
 560         DECODE_TAIL;
 561 }
 562
 563 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 564 {
 565         DECODE_HEAD;
 566
 567         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 568         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 569         bcts->dir = be32_to_cpup(p++);
 570         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 571          * could help us figure out we should be using it. */
 572         DECODE_TAIL;
 573 }
 574
 575 static __be32
 576 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 577 {
 578         DECODE_HEAD;
 579
 580         READ_BUF(4);
 581         close->cl_seqid = be32_to_cpup(p++);
 582         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 583
 584         DECODE_TAIL;
 585 }
 586
 587
 588 static __be32
 589 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 590 {
 591         DECODE_HEAD;
 592
 593         READ_BUF(12);
 594         p = xdr_decode_hyper(p, &commit->co_offset);
 595         commit->co_count = be32_to_cpup(p++);
 596
 597         DECODE_TAIL;
 598 }
 599
 600 static __be32
 601 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 602 {
 603         DECODE_HEAD;
 604
 605         READ_BUF(4);
 606         create->cr_type = be32_to_cpup(p++);
 607         switch (create->cr_type) {
 608         case NF4LNK:
 609                 READ_BUF(4);
 610                 create->cr_datalen = be32_to_cpup(p++);
 611                 READ_BUF(create->cr_datalen);
 612                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 613                 if (!create->cr_data)
 614                         return nfserr_jukebox;
 615                 break;
 616         case NF4BLK:
 617         case NF4CHR:
 618                 READ_BUF(8);
 619                 create->cr_specdata1 = be32_to_cpup(p++);
 620                 create->cr_specdata2 = be32_to_cpup(p++);
 621                 break;
 622         case NF4SOCK:
 623         case NF4FIFO:
 624         case NF4DIR:
 625         default:
 626                 break;
 627         }
 628
 629         READ_BUF(4);
 630         create->cr_namelen = be32_to_cpup(p++);
 631         READ_BUF(create->cr_namelen);
 632         SAVEMEM(create->cr_name, create->cr_namelen);
 633         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 634                 return status;
 635
 636         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 637                                     &create->cr_acl, &create->cr_label);
 638         if (status)
 639                 goto out;
 640
 641         DECODE_TAIL;
 642 }
 643
 644 static inline __be32
 645 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 646 {
 647         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 648 }
 649
 650 static inline __be32
 651 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 652 {
 653         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 654 }
 655
 656 static __be32
 657 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 658 {
 659         DECODE_HEAD;
 660
 661         READ_BUF(4);
 662         link->li_namelen = be32_to_cpup(p++);
 663         READ_BUF(link->li_namelen);
 664         SAVEMEM(link->li_name, link->li_namelen);
 665         if ((status = check_filename(link->li_name, link->li_namelen)))
 666                 return status;
 667
 668         DECODE_TAIL;
 669 }
 670
 671 static __be32
 672 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 673 {
 674         DECODE_HEAD;
 675
 676         /*
 677         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 678         */
 679         READ_BUF(28);
 680         lock->lk_type = be32_to_cpup(p++);
 681         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 682                 goto xdr_error;
 683         lock->lk_reclaim = be32_to_cpup(p++);
 684         p = xdr_decode_hyper(p, &lock->lk_offset);
 685         p = xdr_decode_hyper(p, &lock->lk_length);
 686         lock->lk_is_new = be32_to_cpup(p++);
 687
 688         if (lock->lk_is_new) {
 689                 READ_BUF(4);
 690                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 691                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 692                 if (status)
 693                         return status;
 694                 READ_BUF(8 + sizeof(clientid_t));
 695                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 696                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 697                 lock->lk_new_owner.len = be32_to_cpup(p++);
 698                 READ_BUF(lock->lk_new_owner.len);
 699                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 700         } else {
 701                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 702                 if (status)
 703                         return status;
 704                 READ_BUF(4);
 705                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 706         }
 707
 708         DECODE_TAIL;
 709 }
 710
 711 static __be32
 712 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 713 {
 714         DECODE_HEAD;
 715
 716         READ_BUF(32);
 717         lockt->lt_type = be32_to_cpup(p++);
 718         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 719                 goto xdr_error;
 720         p = xdr_decode_hyper(p, &lockt->lt_offset);
 721         p = xdr_decode_hyper(p, &lockt->lt_length);
 722         COPYMEM(&lockt->lt_clientid, 8);
 723         lockt->lt_owner.len = be32_to_cpup(p++);
 724         READ_BUF(lockt->lt_owner.len);
 725         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 726
 727         DECODE_TAIL;
 728 }
 729
 730 static __be32
 731 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 732 {
 733         DECODE_HEAD;
 734
 735         READ_BUF(8);
 736         locku->lu_type = be32_to_cpup(p++);
 737         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 738                 goto xdr_error;
 739         locku->lu_seqid = be32_to_cpup(p++);
 740         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 741         if (status)
 742                 return status;
 743         READ_BUF(16);
 744         p = xdr_decode_hyper(p, &locku->lu_offset);
 745         p = xdr_decode_hyper(p, &locku->lu_length);
 746
 747         DECODE_TAIL;
 748 }
 749
 750 static __be32
 751 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 752 {
 753         DECODE_HEAD;
 754
 755         READ_BUF(4);
 756         lookup->lo_len = be32_to_cpup(p++);
 757         READ_BUF(lookup->lo_len);
 758         SAVEMEM(lookup->lo_name, lookup->lo_len);
 759         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 760                 return status;
 761
 762         DECODE_TAIL;
 763 }
 764
 765 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 766 {
 767         __be32 *p;
 768         u32 w;
 769
 770         READ_BUF(4);
 771         w = be32_to_cpup(p++);
 772         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 773         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 774         if (deleg_when)
 775                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 776
 777         switch (w & NFS4_SHARE_ACCESS_MASK) {
 778         case NFS4_SHARE_ACCESS_READ:
 779         case NFS4_SHARE_ACCESS_WRITE:
 780         case NFS4_SHARE_ACCESS_BOTH:
 781                 break;
 782         default:
 783                 return nfserr_bad_xdr;
 784         }
 785         w &= ~NFS4_SHARE_ACCESS_MASK;
 786         if (!w)
 787                 return nfs_ok;
 788         if (!argp->minorversion)
 789                 return nfserr_bad_xdr;
 790         switch (w & NFS4_SHARE_WANT_MASK) {
 791         case NFS4_SHARE_WANT_NO_PREFERENCE:
 792         case NFS4_SHARE_WANT_READ_DELEG:
 793         case NFS4_SHARE_WANT_WRITE_DELEG:
 794         case NFS4_SHARE_WANT_ANY_DELEG:
 795         case NFS4_SHARE_WANT_NO_DELEG:
 796         case NFS4_SHARE_WANT_CANCEL:
 797                 break;
 798         default:
 799                 return nfserr_bad_xdr;
 800         }
 801         w &= ~NFS4_SHARE_WANT_MASK;
 802         if (!w)
 803                 return nfs_ok;
 804
 805         if (!deleg_when)        /* open_downgrade */
 806                 return nfserr_inval;
 807         switch (w) {
 808         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 809         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 810         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 811               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 812                 return nfs_ok;
 813         }
 814 xdr_error:
 815         return nfserr_bad_xdr;
 816 }
 817
 818 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 819 {
 820         __be32 *p;
 821
 822         READ_BUF(4);
 823         *x = be32_to_cpup(p++);
 824         /* Note: unlinke access bits, deny bits may be zero. */
 825         if (*x & ~NFS4_SHARE_DENY_BOTH)
 826                 return nfserr_bad_xdr;
 827         return nfs_ok;
 828 xdr_error:
 829         return nfserr_bad_xdr;
 830 }
 831
 832 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 833 {
 834         __be32 *p;
 835
 836         READ_BUF(4);
 837         o->len = be32_to_cpup(p++);
 838
 839         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 840                 return nfserr_bad_xdr;
 841
 842         READ_BUF(o->len);
 843         SAVEMEM(o->data, o->len);
 844         return nfs_ok;
 845 xdr_error:
 846         return nfserr_bad_xdr;
 847 }
 848
 849 static __be32
 850 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 851 {
 852         DECODE_HEAD;
 853         u32 dummy;
 854
 855         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 856         open->op_iattr.ia_valid = 0;
 857         open->op_openowner = NULL;
 858
 859         open->op_xdr_error = 0;
 860         /* seqid, share_access, share_deny, clientid, ownerlen */
 861         READ_BUF(4);
 862         open->op_seqid = be32_to_cpup(p++);
 863         /* decode, yet ignore deleg_when until supported */
 864         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 865                                            &open->op_deleg_want, &dummy);
 866         if (status)
 867                 goto xdr_error;
 868         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 869         if (status)
 870                 goto xdr_error;
 871         READ_BUF(sizeof(clientid_t));
 872         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 873         status = nfsd4_decode_opaque(argp, &open->op_owner);
 874         if (status)
 875                 goto xdr_error;
 876         READ_BUF(4);
 877         open->op_create = be32_to_cpup(p++);
 878         switch (open->op_create) {
 879         case NFS4_OPEN_NOCREATE:
 880                 break;
 881         case NFS4_OPEN_CREATE:
 882                 READ_BUF(4);
 883                 open->op_createmode = be32_to_cpup(p++);
 884                 switch (open->op_createmode) {
 885                 case NFS4_CREATE_UNCHECKED:
 886                 case NFS4_CREATE_GUARDED:
 887                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 888                                 &open->op_iattr, &open->op_acl, &open->op_label);
 889                         if (status)
 890                                 goto out;
 891                         break;
 892                 case NFS4_CREATE_EXCLUSIVE:
 893                         READ_BUF(NFS4_VERIFIER_SIZE);
 894                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 895                         break;
 896                 case NFS4_CREATE_EXCLUSIVE4_1:
 897                         if (argp->minorversion < 1)
 898                                 goto xdr_error;
 899                         READ_BUF(NFS4_VERIFIER_SIZE);
 900                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 901                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 902                                 &open->op_iattr, &open->op_acl, &open->op_label);
 903                         if (status)
 904                                 goto out;
 905                         break;
 906                 default:
 907                         goto xdr_error;
 908                 }
 909                 break;
 910         default:
 911                 goto xdr_error;
 912         }
 913
 914         /* open_claim */
 915         READ_BUF(4);
 916         open->op_claim_type = be32_to_cpup(p++);
 917         switch (open->op_claim_type) {
 918         case NFS4_OPEN_CLAIM_NULL:
 919         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 920                 READ_BUF(4);
 921                 open->op_fname.len = be32_to_cpup(p++);
 922                 READ_BUF(open->op_fname.len);
 923                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 924                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 925                         return status;
 926                 break;
 927         case NFS4_OPEN_CLAIM_PREVIOUS:
 928                 READ_BUF(4);
 929                 open->op_delegate_type = be32_to_cpup(p++);
 930                 break;
 931         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 932                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 933                 if (status)
 934                         return status;
 935                 READ_BUF(4);
 936                 open->op_fname.len = be32_to_cpup(p++);
 937                 READ_BUF(open->op_fname.len);
 938                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 939                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 940                         return status;
 941                 break;
 942         case NFS4_OPEN_CLAIM_FH:
 943         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 944                 if (argp->minorversion < 1)
 945                         goto xdr_error;
 946                 /* void */
 947                 break;
 948         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 949                 if (argp->minorversion < 1)
 950                         goto xdr_error;
 951                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 952                 if (status)
 953                         return status;
 954                 break;
 955         default:
 956                 goto xdr_error;
 957         }
 958
 959         DECODE_TAIL;
 960 }
 961
 962 static __be32
 963 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 964 {
 965         DECODE_HEAD;
 966
 967         if (argp->minorversion >= 1)
 968                 return nfserr_notsupp;
 969
 970         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 971         if (status)
 972                 return status;
 973         READ_BUF(4);
 974         open_conf->oc_seqid = be32_to_cpup(p++);
 975
 976         DECODE_TAIL;
 977 }
 978
 979 static __be32
 980 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 981 {
 982         DECODE_HEAD;
 983
 984         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 985         if (status)
 986                 return status;
 987         READ_BUF(4);
 988         open_down->od_seqid = be32_to_cpup(p++);
 989         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 990                                            &open_down->od_deleg_want, NULL);
 991         if (status)
 992                 return status;
 993         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 994         if (status)
 995                 return status;
 996         DECODE_TAIL;
 997 }
 998
 999 static __be32
1000 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1001 {
1002         DECODE_HEAD;
1003
1004         READ_BUF(4);
1005         putfh->pf_fhlen = be32_to_cpup(p++);
1006         if (putfh->pf_fhlen > NFS4_FHSIZE)
1007                 goto xdr_error;
1008         READ_BUF(putfh->pf_fhlen);
1009         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1010
1011         DECODE_TAIL;
1012 }
1013
1014 static __be32
1015 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1016 {
1017         if (argp->minorversion == 0)
1018                 return nfs_ok;
1019         return nfserr_notsupp;
1020 }
1021
1022 static __be32
1023 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1024 {
1025         DECODE_HEAD;
1026
1027         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1028         if (status)
1029                 return status;
1030         READ_BUF(12);
1031         p = xdr_decode_hyper(p, &read->rd_offset);
1032         read->rd_length = be32_to_cpup(p++);
1033
1034         DECODE_TAIL;
1035 }
1036
1037 static __be32
1038 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1039 {
1040         DECODE_HEAD;
1041
1042         READ_BUF(24);
1043         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1044         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1045         readdir->rd_dircount = be32_to_cpup(p++);
1046         readdir->rd_maxcount = be32_to_cpup(p++);
1047         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1048                 goto out;
1049
1050         DECODE_TAIL;
1051 }
1052
1053 static __be32
1054 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1055 {
1056         DECODE_HEAD;
1057
1058         READ_BUF(4);
1059         remove->rm_namelen = be32_to_cpup(p++);
1060         READ_BUF(remove->rm_namelen);
1061         SAVEMEM(remove->rm_name, remove->rm_namelen);
1062         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1063                 return status;
1064
1065         DECODE_TAIL;
1066 }
1067
1068 static __be32
1069 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1070 {
1071         DECODE_HEAD;
1072
1073         READ_BUF(4);
1074         rename->rn_snamelen = be32_to_cpup(p++);
1075         READ_BUF(rename->rn_snamelen);
1076         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1077         READ_BUF(4);
1078         rename->rn_tnamelen = be32_to_cpup(p++);
1079         READ_BUF(rename->rn_tnamelen);
1080         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1081         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1082                 return status;
1083         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1084                 return status;
1085
1086         DECODE_TAIL;
1087 }
1088
1089 static __be32
1090 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1091 {
1092         DECODE_HEAD;
1093
1094         if (argp->minorversion >= 1)
1095                 return nfserr_notsupp;
1096
1097         READ_BUF(sizeof(clientid_t));
1098         COPYMEM(clientid, sizeof(clientid_t));
1099
1100         DECODE_TAIL;
1101 }
1102
1103 static __be32
1104 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1105                      struct nfsd4_secinfo *secinfo)
1106 {
1107         DECODE_HEAD;
1108
1109         READ_BUF(4);
1110         secinfo->si_namelen = be32_to_cpup(p++);
1111         READ_BUF(secinfo->si_namelen);
1112         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1113         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1114         if (status)
1115                 return status;
1116         DECODE_TAIL;
1117 }
1118
1119 static __be32
1120 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1121                      struct nfsd4_secinfo_no_name *sin)
1122 {
1123         DECODE_HEAD;
1124
1125         READ_BUF(4);
1126         sin->sin_style = be32_to_cpup(p++);
1127         DECODE_TAIL;
1128 }
1129
1130 static __be32
1131 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1132 {
1133         __be32 status;
1134
1135         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1136         if (status)
1137                 return status;
1138         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1139                                   &setattr->sa_acl, &setattr->sa_label);
1140 }
1141
1142 static __be32
1143 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1144 {
1145         DECODE_HEAD;
1146
1147         if (argp->minorversion >= 1)
1148                 return nfserr_notsupp;
1149
1150         READ_BUF(NFS4_VERIFIER_SIZE);
1151         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1152
1153         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1154         if (status)
1155                 return nfserr_bad_xdr;
1156         READ_BUF(8);
1157         setclientid->se_callback_prog = be32_to_cpup(p++);
1158         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1159         READ_BUF(setclientid->se_callback_netid_len);
1160         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1161         READ_BUF(4);
1162         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1163
1164         READ_BUF(setclientid->se_callback_addr_len);
1165         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1166         READ_BUF(4);
1167         setclientid->se_callback_ident = be32_to_cpup(p++);
1168
1169         DECODE_TAIL;
1170 }
1171
1172 static __be32
1173 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1174 {
1175         DECODE_HEAD;
1176
1177         if (argp->minorversion >= 1)
1178                 return nfserr_notsupp;
1179
1180         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1181         COPYMEM(&scd_c->sc_clientid, 8);
1182         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1183
1184         DECODE_TAIL;
1185 }
1186
1187 /* Also used for NVERIFY */
1188 static __be32
1189 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1190 {
1191         DECODE_HEAD;
1192
1193         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1194                 goto out;
1195
1196         /* For convenience's sake, we compare raw xdr'd attributes in
1197          * nfsd4_proc_verify */
1198
1199         READ_BUF(4);
1200         verify->ve_attrlen = be32_to_cpup(p++);
1201         READ_BUF(verify->ve_attrlen);
1202         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1203
1204         DECODE_TAIL;
1205 }
1206
1207 static __be32
1208 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1209 {
1210         int avail;
1211         int len;
1212         DECODE_HEAD;
1213
1214         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1215         if (status)
1216                 return status;
1217         READ_BUF(16);
1218         p = xdr_decode_hyper(p, &write->wr_offset);
1219         write->wr_stable_how = be32_to_cpup(p++);
1220         if (write->wr_stable_how > 2)
1221                 goto xdr_error;
1222         write->wr_buflen = be32_to_cpup(p++);
1223
1224         /* Sorry .. no magic macros for this.. *
1225          * READ_BUF(write->wr_buflen);
1226          * SAVEMEM(write->wr_buf, write->wr_buflen);
1227          */
1228         avail = (char*)argp->end - (char*)argp->p;
1229         if (avail + argp->pagelen < write->wr_buflen) {
1230                 dprintk("NFSD: xdr error (%s:%d)\n",
1231                                 __FILE__, __LINE__);
1232                 goto xdr_error;
1233         }
1234         write->wr_head.iov_base = p;
1235         write->wr_head.iov_len = avail;
1236         write->wr_pagelist = argp->pagelist;
1237
1238         len = XDR_QUADLEN(write->wr_buflen) << 2;
1239         if (len >= avail) {
1240                 int pages;
1241
1242                 len -= avail;
1243
1244                 pages = len >> PAGE_SHIFT;
1245                 argp->pagelist += pages;
1246                 argp->pagelen -= pages * PAGE_SIZE;
1247                 len -= pages * PAGE_SIZE;
1248
1249                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1250                 argp->pagelist++;
1251                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1252         }
1253         argp->p += XDR_QUADLEN(len);
1254
1255         DECODE_TAIL;
1256 }
1257
1258 static __be32
1259 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1260 {
1261         DECODE_HEAD;
1262
1263         if (argp->minorversion >= 1)
1264                 return nfserr_notsupp;
1265
1266         READ_BUF(12);
1267         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1268         rlockowner->rl_owner.len = be32_to_cpup(p++);
1269         READ_BUF(rlockowner->rl_owner.len);
1270         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1271
1272         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1273                 return nfserr_inval;
1274         DECODE_TAIL;
1275 }
1276
1277 static __be32
1278 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1279                          struct nfsd4_exchange_id *exid)
1280 {
1281         int dummy, tmp;
1282         DECODE_HEAD;
1283
1284         READ_BUF(NFS4_VERIFIER_SIZE);
1285         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1286
1287         status = nfsd4_decode_opaque(argp, &exid->clname);
1288         if (status)
1289                 return nfserr_bad_xdr;
1290
1291         READ_BUF(4);
1292         exid->flags = be32_to_cpup(p++);
1293
1294         /* Ignore state_protect4_a */
1295         READ_BUF(4);
1296         exid->spa_how = be32_to_cpup(p++);
1297         switch (exid->spa_how) {
1298         case SP4_NONE:
1299                 break;
1300         case SP4_MACH_CRED:
1301                 /* spo_must_enforce */
1302                 status = nfsd4_decode_bitmap(argp,
1303                                         exid->spo_must_enforce);
1304                 if (status)
1305                         goto out;
1306                 /* spo_must_allow */
1307                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1308                 if (status)
1309                         goto out;
1310                 break;
1311         case SP4_SSV:
1312                 /* ssp_ops */
1313                 READ_BUF(4);
1314                 dummy = be32_to_cpup(p++);
1315                 READ_BUF(dummy * 4);
1316                 p += dummy;
1317
1318                 READ_BUF(4);
1319                 dummy = be32_to_cpup(p++);
1320                 READ_BUF(dummy * 4);
1321                 p += dummy;
1322
1323                 /* ssp_hash_algs<> */
1324                 READ_BUF(4);
1325                 tmp = be32_to_cpup(p++);
1326                 while (tmp--) {
1327                         READ_BUF(4);
1328                         dummy = be32_to_cpup(p++);
1329                         READ_BUF(dummy);
1330                         p += XDR_QUADLEN(dummy);
1331                 }
1332
1333                 /* ssp_encr_algs<> */
1334                 READ_BUF(4);
1335                 tmp = be32_to_cpup(p++);
1336                 while (tmp--) {
1337                         READ_BUF(4);
1338                         dummy = be32_to_cpup(p++);
1339                         READ_BUF(dummy);
1340                         p += XDR_QUADLEN(dummy);
1341                 }
1342
1343                 /* ssp_window and ssp_num_gss_handles */
1344                 READ_BUF(8);
1345                 dummy = be32_to_cpup(p++);
1346                 dummy = be32_to_cpup(p++);
1347                 break;
1348         default:
1349                 goto xdr_error;
1350         }
1351
1352         /* Ignore Implementation ID */
1353         READ_BUF(4);    /* nfs_impl_id4 array length */
1354         dummy = be32_to_cpup(p++);
1355
1356         if (dummy > 1)
1357                 goto xdr_error;
1358
1359         if (dummy == 1) {
1360                 /* nii_domain */
1361                 READ_BUF(4);
1362                 dummy = be32_to_cpup(p++);
1363                 READ_BUF(dummy);
1364                 p += XDR_QUADLEN(dummy);
1365
1366                 /* nii_name */
1367                 READ_BUF(4);
1368                 dummy = be32_to_cpup(p++);
1369                 READ_BUF(dummy);
1370                 p += XDR_QUADLEN(dummy);
1371
1372                 /* nii_date */
1373                 READ_BUF(12);
1374                 p += 3;
1375         }
1376         DECODE_TAIL;
1377 }
1378
1379 static __be32
1380 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1381                             struct nfsd4_create_session *sess)
1382 {
1383         DECODE_HEAD;
1384         u32 dummy;
1385
1386         READ_BUF(16);
1387         COPYMEM(&sess->clientid, 8);
1388         sess->seqid = be32_to_cpup(p++);
1389         sess->flags = be32_to_cpup(p++);
1390
1391         /* Fore channel attrs */
1392         READ_BUF(28);
1393         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1394         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1395         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1396         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1397         sess->fore_channel.maxops = be32_to_cpup(p++);
1398         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1399         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1400         if (sess->fore_channel.nr_rdma_attrs == 1) {
1401                 READ_BUF(4);
1402                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1403         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1404                 dprintk("Too many fore channel attr bitmaps!\n");
1405                 goto xdr_error;
1406         }
1407
1408         /* Back channel attrs */
1409         READ_BUF(28);
1410         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1411         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1412         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1413         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1414         sess->back_channel.maxops = be32_to_cpup(p++);
1415         sess->back_channel.maxreqs = be32_to_cpup(p++);
1416         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1417         if (sess->back_channel.nr_rdma_attrs == 1) {
1418                 READ_BUF(4);
1419                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1420         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1421                 dprintk("Too many back channel attr bitmaps!\n");
1422                 goto xdr_error;
1423         }
1424
1425         READ_BUF(4);
1426         sess->callback_prog = be32_to_cpup(p++);
1427         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1428         DECODE_TAIL;
1429 }
1430
1431 static __be32
1432 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1433                              struct nfsd4_destroy_session *destroy_session)
1434 {
1435         DECODE_HEAD;
1436         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1437         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1438
1439         DECODE_TAIL;
1440 }
1441
1442 static __be32
1443 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1444                           struct nfsd4_free_stateid *free_stateid)
1445 {
1446         DECODE_HEAD;
1447
1448         READ_BUF(sizeof(stateid_t));
1449         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1450         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1451
1452         DECODE_TAIL;
1453 }
1454
1455 static __be32
1456 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1457                       struct nfsd4_sequence *seq)
1458 {
1459         DECODE_HEAD;
1460
1461         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1462         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1463         seq->seqid = be32_to_cpup(p++);
1464         seq->slotid = be32_to_cpup(p++);
1465         seq->maxslots = be32_to_cpup(p++);
1466         seq->cachethis = be32_to_cpup(p++);
1467
1468         DECODE_TAIL;
1469 }
1470
1471 static __be32
1472 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1473 {
1474         int i;
1475         __be32 *p, status;
1476         struct nfsd4_test_stateid_id *stateid;
1477
1478         READ_BUF(4);
1479         test_stateid->ts_num_ids = ntohl(*p++);
1480
1481         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1482
1483         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1484                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1485                 if (!stateid) {
1486                         status = nfserrno(-ENOMEM);
1487                         goto out;
1488                 }
1489
1490                 INIT_LIST_HEAD(&stateid->ts_id_list);
1491                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1492
1493                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1494                 if (status)
1495                         goto out;
1496         }
1497
1498         status = 0;
1499 out:
1500         return status;
1501 xdr_error:
1502         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1503         status = nfserr_bad_xdr;
1504         goto out;
1505 }
1506
1507 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1508 {
1509         DECODE_HEAD;
1510
1511         READ_BUF(8);
1512         COPYMEM(&dc->clientid, 8);
1513
1514         DECODE_TAIL;
1515 }
1516
1517 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1518 {
1519         DECODE_HEAD;
1520
1521         READ_BUF(4);
1522         rc->rca_one_fs = be32_to_cpup(p++);
1523
1524         DECODE_TAIL;
1525 }
1526
1527 #ifdef CONFIG_NFSD_PNFS
1528 static __be32
1529 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1530                 struct nfsd4_getdeviceinfo *gdev)
1531 {
1532         DECODE_HEAD;
1533         u32 num, i;
1534
1535         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1536         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1537         gdev->gd_layout_type = be32_to_cpup(p++);
1538         gdev->gd_maxcount = be32_to_cpup(p++);
1539         num = be32_to_cpup(p++);
1540         if (num) {
1541                 READ_BUF(4 * num);
1542                 gdev->gd_notify_types = be32_to_cpup(p++);
1543                 for (i = 1; i < num; i++) {
1544                         if (be32_to_cpup(p++)) {
1545                                 status = nfserr_inval;
1546                                 goto out;
1547                         }
1548                 }
1549         }
1550         DECODE_TAIL;
1551 }
1552
1553 static __be32
1554 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1555                 struct nfsd4_layoutget *lgp)
1556 {
1557         DECODE_HEAD;
1558
1559         READ_BUF(36);
1560         lgp->lg_signal = be32_to_cpup(p++);
1561         lgp->lg_layout_type = be32_to_cpup(p++);
1562         lgp->lg_seg.iomode = be32_to_cpup(p++);
1563         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1564         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1565         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1566
1567         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1568         if (status)
1569                 return status;
1570
1571         READ_BUF(4);
1572         lgp->lg_maxcount = be32_to_cpup(p++);
1573
1574         DECODE_TAIL;
1575 }
1576
1577 static __be32
1578 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1579                 struct nfsd4_layoutcommit *lcp)
1580 {
1581         DECODE_HEAD;
1582         u32 timechange;
1583
1584         READ_BUF(20);
1585         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1586         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1587         lcp->lc_reclaim = be32_to_cpup(p++);
1588
1589         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1590         if (status)
1591                 return status;
1592
1593         READ_BUF(4);
1594         lcp->lc_newoffset = be32_to_cpup(p++);
1595         if (lcp->lc_newoffset) {
1596                 READ_BUF(8);
1597                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1598         } else
1599                 lcp->lc_last_wr = 0;
1600         READ_BUF(4);
1601         timechange = be32_to_cpup(p++);
1602         if (timechange) {
1603                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1604                 if (status)
1605                         return status;
1606         } else {
1607                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1608         }
1609         READ_BUF(8);
1610         lcp->lc_layout_type = be32_to_cpup(p++);
1611
1612         /*
1613          * Save the layout update in XDR format and let the layout driver deal
1614          * with it later.
1615          */
1616         lcp->lc_up_len = be32_to_cpup(p++);
1617         if (lcp->lc_up_len > 0) {
1618                 READ_BUF(lcp->lc_up_len);
1619                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1620         }
1621
1622         DECODE_TAIL;
1623 }
1624
1625 static __be32
1626 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1627                 struct nfsd4_layoutreturn *lrp)
1628 {
1629         DECODE_HEAD;
1630
1631         READ_BUF(16);
1632         lrp->lr_reclaim = be32_to_cpup(p++);
1633         lrp->lr_layout_type = be32_to_cpup(p++);
1634         lrp->lr_seg.iomode = be32_to_cpup(p++);
1635         lrp->lr_return_type = be32_to_cpup(p++);
1636         if (lrp->lr_return_type == RETURN_FILE) {
1637                 READ_BUF(16);
1638                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1639                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1640
1641                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1642                 if (status)
1643                         return status;
1644
1645                 READ_BUF(4);
1646                 lrp->lrf_body_len = be32_to_cpup(p++);
1647                 if (lrp->lrf_body_len > 0) {
1648                         READ_BUF(lrp->lrf_body_len);
1649                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1650                 }
1651         } else {
1652                 lrp->lr_seg.offset = 0;
1653                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1654         }
1655
1656         DECODE_TAIL;
1657 }
1658 #endif /* CONFIG_NFSD_PNFS */
1659
1660 static __be32
1661 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1662                        struct nfsd4_fallocate *fallocate)
1663 {
1664         DECODE_HEAD;
1665
1666         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1667         if (status)
1668                 return status;
1669
1670         READ_BUF(16);
1671         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1672         xdr_decode_hyper(p, &fallocate->falloc_length);
1673
1674         DECODE_TAIL;
1675 }
1676
1677 static __be32
1678 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1679 {
1680         DECODE_HEAD;
1681
1682         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1683         if (status)
1684                 return status;
1685         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1686         if (status)
1687                 return status;
1688
1689         READ_BUF(8 + 8 + 8);
1690         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1691         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1692         p = xdr_decode_hyper(p, &clone->cl_count);
1693         DECODE_TAIL;
1694 }
1695
1696 static __be32
1697 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1698 {
1699         DECODE_HEAD;
1700
1701         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1702         if (status)
1703                 return status;
1704
1705         READ_BUF(8 + 4);
1706         p = xdr_decode_hyper(p, &seek->seek_offset);
1707         seek->seek_whence = be32_to_cpup(p);
1708
1709         DECODE_TAIL;
1710 }
1711
1712 static __be32
1713 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1714 {
1715         return nfs_ok;
1716 }
1717
1718 static __be32
1719 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1720 {
1721         return nfserr_notsupp;
1722 }
1723
1724 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1725
1726 static nfsd4_dec nfsd4_dec_ops[] = {
1727         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1728         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1729         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1730         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1731         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1732         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1733         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1734         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1735         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1736         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1737         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1738         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1739         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1740         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1741         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1742         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1743         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1744         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1745         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1746         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1747         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1748         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1749         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1750         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1751         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1752         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1753         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1754         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1755         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1756         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1757         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1758         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1759         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1760         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1761         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1762         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1763         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1764
1765         /* new operations for NFSv4.1 */
1766         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1767         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1768         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1769         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1770         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1771         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1772         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1773 #ifdef CONFIG_NFSD_PNFS
1774         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1775         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1776         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1777         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1778         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1779 #else
1780         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1781         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1782         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1783         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1784         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1785 #endif
1786         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1787         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1788         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1789         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1790         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1791         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1792         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1793
1794         /* new operations for NFSv4.2 */
1795         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1796         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_notsupp,
1797         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1798         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1799         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1800         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1801         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1802         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1803         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1804         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1805         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1806         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1807         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1808 };
1809
1810 static inline bool
1811 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1812 {
1813         if (op->opnum < FIRST_NFS4_OP)
1814                 return false;
1815         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1816                 return false;
1817         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1818                 return false;
1819         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1820                 return false;
1821         return true;
1822 }
1823
1824 static __be32
1825 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1826 {
1827         DECODE_HEAD;
1828         struct nfsd4_op *op;
1829         bool cachethis = false;
1830         int auth_slack= argp->rqstp->rq_auth_slack;
1831         int max_reply = auth_slack + 8; /* opcnt, status */
1832         int readcount = 0;
1833         int readbytes = 0;
1834         int i;
1835
1836         READ_BUF(4);
1837         argp->taglen = be32_to_cpup(p++);
1838         READ_BUF(argp->taglen);
1839         SAVEMEM(argp->tag, argp->taglen);
1840         READ_BUF(8);
1841         argp->minorversion = be32_to_cpup(p++);
1842         argp->opcnt = be32_to_cpup(p++);
1843         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1844
1845         if (argp->taglen > NFSD4_MAX_TAGLEN)
1846                 goto xdr_error;
1847         if (argp->opcnt > 100)
1848                 goto xdr_error;
1849
1850         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1851                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1852                 if (!argp->ops) {
1853                         argp->ops = argp->iops;
1854                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1855                         goto xdr_error;
1856                 }
1857         }
1858
1859         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1860                 argp->opcnt = 0;
1861
1862         for (i = 0; i < argp->opcnt; i++) {
1863                 op = &argp->ops[i];
1864                 op->replay = NULL;
1865
1866                 READ_BUF(4);
1867                 op->opnum = be32_to_cpup(p++);
1868
1869                 if (nfsd4_opnum_in_range(argp, op))
1870                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1871                 else {
1872                         op->opnum = OP_ILLEGAL;
1873                         op->status = nfserr_op_illegal;
1874                 }
1875                 /*
1876                  * We'll try to cache the result in the DRC if any one
1877                  * op in the compound wants to be cached:
1878                  */
1879                 cachethis |= nfsd4_cache_this_op(op);
1880
1881                 if (op->opnum == OP_READ) {
1882                         readcount++;
1883                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1884                 } else
1885                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1886                 /*
1887                  * OP_LOCK may return a conflicting lock.  (Special case
1888                  * because it will just skip encoding this if it runs
1889                  * out of xdr buffer space, and it is the only operation
1890                  * that behaves this way.)
1891                  */
1892                 if (op->opnum == OP_LOCK)
1893                         max_reply += NFS4_OPAQUE_LIMIT;
1894
1895                 if (op->status) {
1896                         argp->opcnt = i+1;
1897                         break;
1898                 }
1899         }
1900         /* Sessions make the DRC unnecessary: */
1901         if (argp->minorversion)
1902                 cachethis = false;
1903         svc_reserve(argp->rqstp, max_reply + readbytes);
1904         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1905
1906         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1907                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1908
1909         DECODE_TAIL;
1910 }
1911
1912 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1913 {
1914         if (IS_I_VERSION(inode)) {
1915                 p = xdr_encode_hyper(p, inode->i_version);
1916         } else {
1917                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1918                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1919         }
1920         return p;
1921 }
1922
1923 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1924 {
1925         *p++ = cpu_to_be32(c->atomic);
1926         if (c->change_supported) {
1927                 p = xdr_encode_hyper(p, c->before_change);
1928                 p = xdr_encode_hyper(p, c->after_change);
1929         } else {
1930                 *p++ = cpu_to_be32(c->before_ctime_sec);
1931                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1932                 *p++ = cpu_to_be32(c->after_ctime_sec);
1933                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1934         }
1935         return p;
1936 }
1937
1938 /* Encode as an array of strings the string given with components
1939  * separated @sep, escaped with esc_enter and esc_exit.
1940  */
1941 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1942                                           char *components, char esc_enter,
1943                                           char esc_exit)
1944 {
1945         __be32 *p;
1946         __be32 pathlen;
1947         int pathlen_offset;
1948         int strlen, count=0;
1949         char *str, *end, *next;
1950
1951         dprintk("nfsd4_encode_components(%s)\n", components);
1952
1953         pathlen_offset = xdr->buf->len;
1954         p = xdr_reserve_space(xdr, 4);
1955         if (!p)
1956                 return nfserr_resource;
1957         p++; /* We will fill this in with @count later */
1958
1959         end = str = components;
1960         while (*end) {
1961                 bool found_esc = false;
1962
1963                 /* try to parse as esc_start, ..., esc_end, sep */
1964                 if (*str == esc_enter) {
1965                         for (; *end && (*end != esc_exit); end++)
1966                                 /* find esc_exit or end of string */;
1967                         next = end + 1;
1968                         if (*end && (!*next || *next == sep)) {
1969                                 str++;
1970                                 found_esc = true;
1971                         }
1972                 }
1973
1974                 if (!found_esc)
1975                         for (; *end && (*end != sep); end++)
1976                                 /* find sep or end of string */;
1977
1978                 strlen = end - str;
1979                 if (strlen) {
1980                         p = xdr_reserve_space(xdr, strlen + 4);
1981                         if (!p)
1982                                 return nfserr_resource;
1983                         p = xdr_encode_opaque(p, str, strlen);
1984                         count++;
1985                 }
1986                 else
1987                         end++;
1988                 if (found_esc)
1989                         end = next;
1990
1991                 str = end;
1992         }
1993         pathlen = htonl(count);
1994         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1995         return 0;
1996 }
1997
1998 /* Encode as an array of strings the string given with components
1999  * separated @sep.
2000  */
2001 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2002                                       char *components)
2003 {
2004         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2005 }
2006
2007 /*
2008  * encode a location element of a fs_locations structure
2009  */
2010 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2011                                         struct nfsd4_fs_location *location)
2012 {
2013         __be32 status;
2014
2015         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2016                                                 '[', ']');
2017         if (status)
2018                 return status;
2019         status = nfsd4_encode_components(xdr, '/', location->path);
2020         if (status)
2021                 return status;
2022         return 0;
2023 }
2024
2025 /*
2026  * Encode a path in RFC3530 'pathname4' format
2027  */
2028 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2029                                 const struct path *root,
2030                                 const struct path *path)
2031 {
2032         struct path cur = *path;
2033         __be32 *p;
2034         struct dentry **components = NULL;
2035         unsigned int ncomponents = 0;
2036         __be32 err = nfserr_jukebox;
2037
2038         dprintk("nfsd4_encode_components(");
2039
2040         path_get(&cur);
2041         /* First walk the path up to the nfsd root, and store the
2042          * dentries/path components in an array.
2043          */
2044         for (;;) {
2045                 if (path_equal(&cur, root))
2046                         break;
2047                 if (cur.dentry == cur.mnt->mnt_root) {
2048                         if (follow_up(&cur))
2049                                 continue;
2050                         goto out_free;
2051                 }
2052                 if ((ncomponents & 15) == 0) {
2053                         struct dentry **new;
2054                         new = krealloc(components,
2055                                         sizeof(*new) * (ncomponents + 16),
2056                                         GFP_KERNEL);
2057                         if (!new)
2058                                 goto out_free;
2059                         components = new;
2060                 }
2061                 components[ncomponents++] = cur.dentry;
2062                 cur.dentry = dget_parent(cur.dentry);
2063         }
2064         err = nfserr_resource;
2065         p = xdr_reserve_space(xdr, 4);
2066         if (!p)
2067                 goto out_free;
2068         *p++ = cpu_to_be32(ncomponents);
2069
2070         while (ncomponents) {
2071                 struct dentry *dentry = components[ncomponents - 1];
2072                 unsigned int len;
2073
2074                 spin_lock(&dentry->d_lock);
2075                 len = dentry->d_name.len;
2076                 p = xdr_reserve_space(xdr, len + 4);
2077                 if (!p) {
2078                         spin_unlock(&dentry->d_lock);
2079                         goto out_free;
2080                 }
2081                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2082                 dprintk("/%pd", dentry);
2083                 spin_unlock(&dentry->d_lock);
2084                 dput(dentry);
2085                 ncomponents--;
2086         }
2087
2088         err = 0;
2089 out_free:
2090         dprintk(")\n");
2091         while (ncomponents)
2092                 dput(components[--ncomponents]);
2093         kfree(components);
2094         path_put(&cur);
2095         return err;
2096 }
2097
2098 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2099                         struct svc_rqst *rqstp, const struct path *path)
2100 {
2101         struct svc_export *exp_ps;
2102         __be32 res;
2103
2104         exp_ps = rqst_find_fsidzero_export(rqstp);
2105         if (IS_ERR(exp_ps))
2106                 return nfserrno(PTR_ERR(exp_ps));
2107         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2108         exp_put(exp_ps);
2109         return res;
2110 }
2111
2112 /*
2113  *  encode a fs_locations structure
2114  */
2115 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2116                         struct svc_rqst *rqstp, struct svc_export *exp)
2117 {
2118         __be32 status;
2119         int i;
2120         __be32 *p;
2121         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2122
2123         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2124         if (status)
2125                 return status;
2126         p = xdr_reserve_space(xdr, 4);
2127         if (!p)
2128                 return nfserr_resource;
2129         *p++ = cpu_to_be32(fslocs->locations_count);
2130         for (i=0; i<fslocs->locations_count; i++) {
2131                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2132                 if (status)
2133                         return status;
2134         }
2135         return 0;
2136 }
2137
2138 static u32 nfs4_file_type(umode_t mode)
2139 {
2140         switch (mode & S_IFMT) {
2141         case S_IFIFO:   return NF4FIFO;
2142         case S_IFCHR:   return NF4CHR;
2143         case S_IFDIR:   return NF4DIR;
2144         case S_IFBLK:   return NF4BLK;
2145         case S_IFLNK:   return NF4LNK;
2146         case S_IFREG:   return NF4REG;
2147         case S_IFSOCK:  return NF4SOCK;
2148         default:        return NF4BAD;
2149         };
2150 }
2151
2152 static inline __be32
2153 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2154                      struct nfs4_ace *ace)
2155 {
2156         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2157                 return nfs4_acl_write_who(xdr, ace->whotype);
2158         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2159                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2160         else
2161                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2162 }
2163
2164 static inline __be32
2165 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2166 {
2167         __be32          *p;
2168         unsigned long   i = hweight_long(layout_types);
2169
2170         p = xdr_reserve_space(xdr, 4 + 4 * i);
2171         if (!p)
2172                 return nfserr_resource;
2173
2174         *p++ = cpu_to_be32(i);
2175
2176         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2177                 if (layout_types & (1 << i))
2178                         *p++ = cpu_to_be32(i);
2179
2180         return 0;
2181 }
2182
2183 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2184                               FATTR4_WORD0_RDATTR_ERROR)
2185 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2186 #define WORD2_ABSENT_FS_ATTRS 0
2187
2188 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2189 static inline __be32
2190 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2191                             void *context, int len)
2192 {
2193         __be32 *p;
2194
2195         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2196         if (!p)
2197                 return nfserr_resource;
2198
2199         /*
2200          * For now we use a 0 here to indicate the null translation; in
2201          * the future we may place a call to translation code here.
2202          */
2203         *p++ = cpu_to_be32(0); /* lfs */
2204         *p++ = cpu_to_be32(0); /* pi */
2205         p = xdr_encode_opaque(p, context, len);
2206         return 0;
2207 }
2208 #else
2209 static inline __be32
2210 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2211                             void *context, int len)
2212 { return 0; }
2213 #endif
2214
2215 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2216 {
2217         /* As per referral draft:  */
2218         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2219             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2220                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2221                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2222                         *rdattr_err = NFSERR_MOVED;
2223                 else
2224                         return nfserr_moved;
2225         }
2226         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2227         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2228         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2229         return 0;
2230 }
2231
2232
2233 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2234 {
2235         struct path path = exp->ex_path;
2236         int err;
2237
2238         path_get(&path);
2239         while (follow_up(&path)) {
2240                 if (path.dentry != path.mnt->mnt_root)
2241                         break;
2242         }
2243         err = vfs_getattr(&path, stat);
2244         path_put(&path);
2245         return err;
2246 }
2247
2248 static __be32
2249 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2250 {
2251         __be32 *p;
2252
2253         if (bmval2) {
2254                 p = xdr_reserve_space(xdr, 16);
2255                 if (!p)
2256                         goto out_resource;
2257                 *p++ = cpu_to_be32(3);
2258                 *p++ = cpu_to_be32(bmval0);
2259                 *p++ = cpu_to_be32(bmval1);
2260                 *p++ = cpu_to_be32(bmval2);
2261         } else if (bmval1) {
2262                 p = xdr_reserve_space(xdr, 12);
2263                 if (!p)
2264                         goto out_resource;
2265                 *p++ = cpu_to_be32(2);
2266                 *p++ = cpu_to_be32(bmval0);
2267                 *p++ = cpu_to_be32(bmval1);
2268         } else {
2269                 p = xdr_reserve_space(xdr, 8);
2270                 if (!p)
2271                         goto out_resource;
2272                 *p++ = cpu_to_be32(1);
2273                 *p++ = cpu_to_be32(bmval0);
2274         }
2275
2276         return 0;
2277 out_resource:
2278         return nfserr_resource;
2279 }
2280
2281 /*
2282  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2283  * ourselves.
2284  */
2285 static __be32
2286 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2287                 struct svc_export *exp,
2288                 struct dentry *dentry, u32 *bmval,
2289                 struct svc_rqst *rqstp, int ignore_crossmnt)
2290 {
2291         u32 bmval0 = bmval[0];
2292         u32 bmval1 = bmval[1];
2293         u32 bmval2 = bmval[2];
2294         struct kstat stat;
2295         struct svc_fh *tempfh = NULL;
2296         struct kstatfs statfs;
2297         __be32 *p;
2298         int starting_len = xdr->buf->len;
2299         int attrlen_offset;
2300         __be32 attrlen;
2301         u32 dummy;
2302         u64 dummy64;
2303         u32 rdattr_err = 0;
2304         __be32 status;
2305         int err;
2306         struct nfs4_acl *acl = NULL;
2307         void *context = NULL;
2308         int contextlen;
2309         bool contextsupport = false;
2310         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2311         u32 minorversion = resp->cstate.minorversion;
2312         struct path path = {
2313                 .mnt    = exp->ex_path.mnt,
2314                 .dentry = dentry,
2315         };
2316         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2317
2318         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2319         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2320         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2321         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2322
2323         if (exp->ex_fslocs.migrated) {
2324                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2325                 if (status)
2326                         goto out;
2327         }
2328
2329         err = vfs_getattr(&path, &stat);
2330         if (err)
2331                 goto out_nfserr;
2332         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2333                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2334             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2335                        FATTR4_WORD1_SPACE_TOTAL))) {
2336                 err = vfs_statfs(&path, &statfs);
2337                 if (err)
2338                         goto out_nfserr;
2339         }
2340         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2341                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2342                 status = nfserr_jukebox;
2343                 if (!tempfh)
2344                         goto out;
2345                 fh_init(tempfh, NFS4_FHSIZE);
2346                 status = fh_compose(tempfh, exp, dentry, NULL);
2347                 if (status)
2348                         goto out;
2349                 fhp = tempfh;
2350         }
2351         if (bmval0 & FATTR4_WORD0_ACL) {
2352                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2353                 if (err == -EOPNOTSUPP)
2354                         bmval0 &= ~FATTR4_WORD0_ACL;
2355                 else if (err == -EINVAL) {
2356                         status = nfserr_attrnotsupp;
2357                         goto out;
2358                 } else if (err != 0)
2359                         goto out_nfserr;
2360         }
2361
2362 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2363         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2364              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2365                 err = security_inode_getsecctx(d_inode(dentry),
2366                                                 &context, &contextlen);
2367                 contextsupport = (err == 0);
2368                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2369                         if (err == -EOPNOTSUPP)
2370                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2371                         else if (err)
2372                                 goto out_nfserr;
2373                 }
2374         }
2375 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2376
2377         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2378         if (status)
2379                 goto out;
2380
2381         attrlen_offset = xdr->buf->len;
2382         p = xdr_reserve_space(xdr, 4);
2383         if (!p)
2384                 goto out_resource;
2385         p++;                /* to be backfilled later */
2386
2387         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2388                 u32 word0 = nfsd_suppattrs0(minorversion);
2389                 u32 word1 = nfsd_suppattrs1(minorversion);
2390                 u32 word2 = nfsd_suppattrs2(minorversion);
2391
2392                 if (!IS_POSIXACL(dentry->d_inode))
2393                         word0 &= ~FATTR4_WORD0_ACL;
2394                 if (!contextsupport)
2395                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2396                 if (!word2) {
2397                         p = xdr_reserve_space(xdr, 12);
2398                         if (!p)
2399                                 goto out_resource;
2400                         *p++ = cpu_to_be32(2);
2401                         *p++ = cpu_to_be32(word0);
2402                         *p++ = cpu_to_be32(word1);
2403                 } else {
2404                         p = xdr_reserve_space(xdr, 16);
2405                         if (!p)
2406                                 goto out_resource;
2407                         *p++ = cpu_to_be32(3);
2408                         *p++ = cpu_to_be32(word0);
2409                         *p++ = cpu_to_be32(word1);
2410                         *p++ = cpu_to_be32(word2);
2411                 }
2412         }
2413         if (bmval0 & FATTR4_WORD0_TYPE) {
2414                 p = xdr_reserve_space(xdr, 4);
2415                 if (!p)
2416                         goto out_resource;
2417                 dummy = nfs4_file_type(stat.mode);
2418                 if (dummy == NF4BAD) {
2419                         status = nfserr_serverfault;
2420                         goto out;
2421                 }
2422                 *p++ = cpu_to_be32(dummy);
2423         }
2424         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2425                 p = xdr_reserve_space(xdr, 4);
2426                 if (!p)
2427                         goto out_resource;
2428                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2429                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2430                 else
2431                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2432                                                 NFS4_FH_VOL_RENAME);
2433         }
2434         if (bmval0 & FATTR4_WORD0_CHANGE) {
2435                 p = xdr_reserve_space(xdr, 8);
2436                 if (!p)
2437                         goto out_resource;
2438                 p = encode_change(p, &stat, d_inode(dentry));
2439         }
2440         if (bmval0 & FATTR4_WORD0_SIZE) {
2441                 p = xdr_reserve_space(xdr, 8);
2442                 if (!p)
2443                         goto out_resource;
2444                 p = xdr_encode_hyper(p, stat.size);
2445         }
2446         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2447                 p = xdr_reserve_space(xdr, 4);
2448                 if (!p)
2449                         goto out_resource;
2450                 *p++ = cpu_to_be32(1);
2451         }
2452         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2453                 p = xdr_reserve_space(xdr, 4);
2454                 if (!p)
2455                         goto out_resource;
2456                 *p++ = cpu_to_be32(1);
2457         }
2458         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2459                 p = xdr_reserve_space(xdr, 4);
2460                 if (!p)
2461                         goto out_resource;
2462                 *p++ = cpu_to_be32(0);
2463         }
2464         if (bmval0 & FATTR4_WORD0_FSID) {
2465                 p = xdr_reserve_space(xdr, 16);
2466                 if (!p)
2467                         goto out_resource;
2468                 if (exp->ex_fslocs.migrated) {
2469                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2470                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2471                 } else switch(fsid_source(fhp)) {
2472                 case FSIDSOURCE_FSID:
2473                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2474                         p = xdr_encode_hyper(p, (u64)0);
2475                         break;
2476                 case FSIDSOURCE_DEV:
2477                         *p++ = cpu_to_be32(0);
2478                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2479                         *p++ = cpu_to_be32(0);
2480                         *p++ = cpu_to_be32(MINOR(stat.dev));
2481                         break;
2482                 case FSIDSOURCE_UUID:
2483                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2484                                                                 EX_UUID_LEN);
2485                         break;
2486                 }
2487         }
2488         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2489                 p = xdr_reserve_space(xdr, 4);
2490                 if (!p)
2491                         goto out_resource;
2492                 *p++ = cpu_to_be32(0);
2493         }
2494         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2495                 p = xdr_reserve_space(xdr, 4);
2496                 if (!p)
2497                         goto out_resource;
2498                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2499         }
2500         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2501                 p = xdr_reserve_space(xdr, 4);
2502                 if (!p)
2503                         goto out_resource;
2504                 *p++ = cpu_to_be32(rdattr_err);
2505         }
2506         if (bmval0 & FATTR4_WORD0_ACL) {
2507                 struct nfs4_ace *ace;
2508
2509                 if (acl == NULL) {
2510                         p = xdr_reserve_space(xdr, 4);
2511                         if (!p)
2512                                 goto out_resource;
2513
2514                         *p++ = cpu_to_be32(0);
2515                         goto out_acl;
2516                 }
2517                 p = xdr_reserve_space(xdr, 4);
2518                 if (!p)
2519                         goto out_resource;
2520                 *p++ = cpu_to_be32(acl->naces);
2521
2522                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2523                         p = xdr_reserve_space(xdr, 4*3);
2524                         if (!p)
2525                                 goto out_resource;
2526                         *p++ = cpu_to_be32(ace->type);
2527                         *p++ = cpu_to_be32(ace->flag);
2528                         *p++ = cpu_to_be32(ace->access_mask &
2529                                                         NFS4_ACE_MASK_ALL);
2530                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2531                         if (status)
2532                                 goto out;
2533                 }
2534         }
2535 out_acl:
2536         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2537                 p = xdr_reserve_space(xdr, 4);
2538                 if (!p)
2539                         goto out_resource;
2540                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2541                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2542         }
2543         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2544                 p = xdr_reserve_space(xdr, 4);
2545                 if (!p)
2546                         goto out_resource;
2547                 *p++ = cpu_to_be32(1);
2548         }
2549         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2550                 p = xdr_reserve_space(xdr, 4);
2551                 if (!p)
2552                         goto out_resource;
2553                 *p++ = cpu_to_be32(0);
2554         }
2555         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2556                 p = xdr_reserve_space(xdr, 4);
2557                 if (!p)
2558                         goto out_resource;
2559                 *p++ = cpu_to_be32(1);
2560         }
2561         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2562                 p = xdr_reserve_space(xdr, 4);
2563                 if (!p)
2564                         goto out_resource;
2565                 *p++ = cpu_to_be32(1);
2566         }
2567         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2568                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2569                 if (!p)
2570                         goto out_resource;
2571                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2572                                         fhp->fh_handle.fh_size);
2573         }
2574         if (bmval0 & FATTR4_WORD0_FILEID) {
2575                 p = xdr_reserve_space(xdr, 8);
2576                 if (!p)
2577                         goto out_resource;
2578                 p = xdr_encode_hyper(p, stat.ino);
2579         }
2580         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2581                 p = xdr_reserve_space(xdr, 8);
2582                 if (!p)
2583                         goto out_resource;
2584                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2585         }
2586         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2587                 p = xdr_reserve_space(xdr, 8);
2588                 if (!p)
2589                         goto out_resource;
2590                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2591         }
2592         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2593                 p = xdr_reserve_space(xdr, 8);
2594                 if (!p)
2595                         goto out_resource;
2596                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2597         }
2598         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2599                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2600                 if (status)
2601                         goto out;
2602         }
2603         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2604                 p = xdr_reserve_space(xdr, 4);
2605                 if (!p)
2606                         goto out_resource;
2607                 *p++ = cpu_to_be32(1);
2608         }
2609         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2610                 p = xdr_reserve_space(xdr, 8);
2611                 if (!p)
2612                         goto out_resource;
2613                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2614         }
2615         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2616                 p = xdr_reserve_space(xdr, 4);
2617                 if (!p)
2618                         goto out_resource;
2619                 *p++ = cpu_to_be32(255);
2620         }
2621         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2622                 p = xdr_reserve_space(xdr, 4);
2623                 if (!p)
2624                         goto out_resource;
2625                 *p++ = cpu_to_be32(statfs.f_namelen);
2626         }
2627         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2628                 p = xdr_reserve_space(xdr, 8);
2629                 if (!p)
2630                         goto out_resource;
2631                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2632         }
2633         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2634                 p = xdr_reserve_space(xdr, 8);
2635                 if (!p)
2636                         goto out_resource;
2637                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2638         }
2639         if (bmval1 & FATTR4_WORD1_MODE) {
2640                 p = xdr_reserve_space(xdr, 4);
2641                 if (!p)
2642                         goto out_resource;
2643                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2644         }
2645         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2646                 p = xdr_reserve_space(xdr, 4);
2647                 if (!p)
2648                         goto out_resource;
2649                 *p++ = cpu_to_be32(1);
2650         }
2651         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2652                 p = xdr_reserve_space(xdr, 4);
2653                 if (!p)
2654                         goto out_resource;
2655                 *p++ = cpu_to_be32(stat.nlink);
2656         }
2657         if (bmval1 & FATTR4_WORD1_OWNER) {
2658                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2659                 if (status)
2660                         goto out;
2661         }
2662         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2663                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2664                 if (status)
2665                         goto out;
2666         }
2667         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2668                 p = xdr_reserve_space(xdr, 8);
2669                 if (!p)
2670                         goto out_resource;
2671                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2672                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2673         }
2674         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2675                 p = xdr_reserve_space(xdr, 8);
2676                 if (!p)
2677                         goto out_resource;
2678                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2679                 p = xdr_encode_hyper(p, dummy64);
2680         }
2681         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2682                 p = xdr_reserve_space(xdr, 8);
2683                 if (!p)
2684                         goto out_resource;
2685                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2686                 p = xdr_encode_hyper(p, dummy64);
2687         }
2688         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2689                 p = xdr_reserve_space(xdr, 8);
2690                 if (!p)
2691                         goto out_resource;
2692                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2693                 p = xdr_encode_hyper(p, dummy64);
2694         }
2695         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2696                 p = xdr_reserve_space(xdr, 8);
2697                 if (!p)
2698                         goto out_resource;
2699                 dummy64 = (u64)stat.blocks << 9;
2700                 p = xdr_encode_hyper(p, dummy64);
2701         }
2702         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2703                 p = xdr_reserve_space(xdr, 12);
2704                 if (!p)
2705                         goto out_resource;
2706                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2707                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2708         }
2709         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2710                 p = xdr_reserve_space(xdr, 12);
2711                 if (!p)
2712                         goto out_resource;
2713                 *p++ = cpu_to_be32(0);
2714                 *p++ = cpu_to_be32(1);
2715                 *p++ = cpu_to_be32(0);
2716         }
2717         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2718                 p = xdr_reserve_space(xdr, 12);
2719                 if (!p)
2720                         goto out_resource;
2721                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2722                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2723         }
2724         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2725                 p = xdr_reserve_space(xdr, 12);
2726                 if (!p)
2727                         goto out_resource;
2728                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2729                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2730         }
2731         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2732                 struct kstat parent_stat;
2733                 u64 ino = stat.ino;
2734
2735                 p = xdr_reserve_space(xdr, 8);
2736                 if (!p)
2737                         goto out_resource;
2738                 /*
2739                  * Get parent's attributes if not ignoring crossmount
2740                  * and this is the root of a cross-mounted filesystem.
2741                  */
2742                 if (ignore_crossmnt == 0 &&
2743                     dentry == exp->ex_path.mnt->mnt_root) {
2744                         err = get_parent_attributes(exp, &parent_stat);
2745                         if (err)
2746                                 goto out_nfserr;
2747                         ino = parent_stat.ino;
2748                 }
2749                 p = xdr_encode_hyper(p, ino);
2750         }
2751 #ifdef CONFIG_NFSD_PNFS
2752         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2753                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2754                 if (status)
2755                         goto out;
2756         }
2757
2758         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2759                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2760                 if (status)
2761                         goto out;
2762         }
2763
2764         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2765                 p = xdr_reserve_space(xdr, 4);
2766                 if (!p)
2767                         goto out_resource;
2768                 *p++ = cpu_to_be32(stat.blksize);
2769         }
2770 #endif /* CONFIG_NFSD_PNFS */
2771         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2772                 status = nfsd4_encode_bitmap(xdr, NFSD_SUPPATTR_EXCLCREAT_WORD0,
2773                                                   NFSD_SUPPATTR_EXCLCREAT_WORD1,
2774                                                   NFSD_SUPPATTR_EXCLCREAT_WORD2);
2775                 if (status)
2776                         goto out;
2777         }
2778
2779         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2780                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2781                                                                 contextlen);
2782                 if (status)
2783                         goto out;
2784         }
2785
2786         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2787         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2788         status = nfs_ok;
2789
2790 out:
2791 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2792         if (context)
2793                 security_release_secctx(context, contextlen);
2794 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2795         kfree(acl);
2796         if (tempfh) {
2797                 fh_put(tempfh);
2798                 kfree(tempfh);
2799         }
2800         if (status)
2801                 xdr_truncate_encode(xdr, starting_len);
2802         return status;
2803 out_nfserr:
2804         status = nfserrno(err);
2805         goto out;
2806 out_resource:
2807         status = nfserr_resource;
2808         goto out;
2809 }
2810
2811 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2812                                 struct xdr_buf *buf, __be32 *p, int bytes)
2813 {
2814         xdr->scratch.iov_len = 0;
2815         memset(buf, 0, sizeof(struct xdr_buf));
2816         buf->head[0].iov_base = p;
2817         buf->head[0].iov_len = 0;
2818         buf->len = 0;
2819         xdr->buf = buf;
2820         xdr->iov = buf->head;
2821         xdr->p = p;
2822         xdr->end = (void *)p + bytes;
2823         buf->buflen = bytes;
2824 }
2825
2826 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2827                         struct svc_fh *fhp, struct svc_export *exp,
2828                         struct dentry *dentry, u32 *bmval,
2829                         struct svc_rqst *rqstp, int ignore_crossmnt)
2830 {
2831         struct xdr_buf dummy;
2832         struct xdr_stream xdr;
2833         __be32 ret;
2834
2835         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2836         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2837                                                         ignore_crossmnt);
2838         *p = xdr.p;
2839         return ret;
2840 }
2841
2842 static inline int attributes_need_mount(u32 *bmval)
2843 {
2844         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2845                 return 1;
2846         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2847                 return 1;
2848         return 0;
2849 }
2850
2851 static __be32
2852 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2853                         const char *name, int namlen)
2854 {
2855         struct svc_export *exp = cd->rd_fhp->fh_export;
2856         struct dentry *dentry;
2857         __be32 nfserr;
2858         int ignore_crossmnt = 0;
2859
2860         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2861         if (IS_ERR(dentry))
2862                 return nfserrno(PTR_ERR(dentry));
2863         if (d_really_is_negative(dentry)) {
2864                 /*
2865                  * we're not holding the i_mutex here, so there's
2866                  * a window where this directory entry could have gone
2867                  * away.
2868                  */
2869                 dput(dentry);
2870                 return nfserr_noent;
2871         }
2872
2873         exp_get(exp);
2874         /*
2875          * In the case of a mountpoint, the client may be asking for
2876          * attributes that are only properties of the underlying filesystem
2877          * as opposed to the cross-mounted file system. In such a case,
2878          * we will not follow the cross mount and will fill the attribtutes
2879          * directly from the mountpoint dentry.
2880          */
2881         if (nfsd_mountpoint(dentry, exp)) {
2882                 int err;
2883
2884                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2885                                 && !attributes_need_mount(cd->rd_bmval)) {
2886                         ignore_crossmnt = 1;
2887                         goto out_encode;
2888                 }
2889                 /*
2890                  * Why the heck aren't we just using nfsd_lookup??
2891                  * Different "."/".." handling?  Something else?
2892                  * At least, add a comment here to explain....
2893                  */
2894                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2895                 if (err) {
2896                         nfserr = nfserrno(err);
2897                         goto out_put;
2898                 }
2899                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2900                 if (nfserr)
2901                         goto out_put;
2902
2903         }
2904 out_encode:
2905         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2906                                         cd->rd_rqstp, ignore_crossmnt);
2907 out_put:
2908         dput(dentry);
2909         exp_put(exp);
2910         return nfserr;
2911 }
2912
2913 static __be32 *
2914 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2915 {
2916         __be32 *p;
2917
2918         p = xdr_reserve_space(xdr, 20);
2919         if (!p)
2920                 return NULL;
2921         *p++ = htonl(2);
2922         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2923         *p++ = htonl(0);                         /* bmval1 */
2924
2925         *p++ = htonl(4);     /* attribute length */
2926         *p++ = nfserr;       /* no htonl */
2927         return p;
2928 }
2929
2930 static int
2931 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2932                     loff_t offset, u64 ino, unsigned int d_type)
2933 {
2934         struct readdir_cd *ccd = ccdv;
2935         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2936         struct xdr_stream *xdr = cd->xdr;
2937         int start_offset = xdr->buf->len;
2938         int cookie_offset;
2939         u32 name_and_cookie;
2940         int entry_bytes;
2941         __be32 nfserr = nfserr_toosmall;
2942         __be64 wire_offset;
2943         __be32 *p;
2944
2945         /* In nfsv4, "." and ".." never make it onto the wire.. */
2946         if (name && isdotent(name, namlen)) {
2947                 cd->common.err = nfs_ok;
2948                 return 0;
2949         }
2950
2951         if (cd->cookie_offset) {
2952                 wire_offset = cpu_to_be64(offset);
2953                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2954                                                         &wire_offset, 8);
2955         }
2956
2957         p = xdr_reserve_space(xdr, 4);
2958         if (!p)
2959                 goto fail;
2960         *p++ = xdr_one;                             /* mark entry present */
2961         cookie_offset = xdr->buf->len;
2962         p = xdr_reserve_space(xdr, 3*4 + namlen);
2963         if (!p)
2964                 goto fail;
2965         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2966         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2967
2968         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2969         switch (nfserr) {
2970         case nfs_ok:
2971                 break;
2972         case nfserr_resource:
2973                 nfserr = nfserr_toosmall;
2974                 goto fail;
2975         case nfserr_noent:
2976                 xdr_truncate_encode(xdr, start_offset);
2977                 goto skip_entry;
2978         default:
2979                 /*
2980                  * If the client requested the RDATTR_ERROR attribute,
2981                  * we stuff the error code into this attribute
2982                  * and continue.  If this attribute was not requested,
2983                  * then in accordance with the spec, we fail the
2984                  * entire READDIR operation(!)
2985                  */
2986                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2987                         goto fail;
2988                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2989                 if (p == NULL) {
2990                         nfserr = nfserr_toosmall;
2991                         goto fail;
2992                 }
2993         }
2994         nfserr = nfserr_toosmall;
2995         entry_bytes = xdr->buf->len - start_offset;
2996         if (entry_bytes > cd->rd_maxcount)
2997                 goto fail;
2998         cd->rd_maxcount -= entry_bytes;
2999         /*
3000          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3001          * let's always let through the first entry, at least:
3002          */
3003         if (!cd->rd_dircount)
3004                 goto fail;
3005         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3006         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3007                 goto fail;
3008         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3009
3010         cd->cookie_offset = cookie_offset;
3011 skip_entry:
3012         cd->common.err = nfs_ok;
3013         return 0;
3014 fail:
3015         xdr_truncate_encode(xdr, start_offset);
3016         cd->common.err = nfserr;
3017         return -EINVAL;
3018 }
3019
3020 static __be32
3021 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3022 {
3023         __be32 *p;
3024
3025         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3026         if (!p)
3027                 return nfserr_resource;
3028         *p++ = cpu_to_be32(sid->si_generation);
3029         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3030                                         sizeof(stateid_opaque_t));
3031         return 0;
3032 }
3033
3034 static __be32
3035 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3036 {
3037         struct xdr_stream *xdr = &resp->xdr;
3038         __be32 *p;
3039
3040         if (!nfserr) {
3041                 p = xdr_reserve_space(xdr, 8);
3042                 if (!p)
3043                         return nfserr_resource;
3044                 *p++ = cpu_to_be32(access->ac_supported);
3045                 *p++ = cpu_to_be32(access->ac_resp_access);
3046         }
3047         return nfserr;
3048 }
3049
3050 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3051 {
3052         struct xdr_stream *xdr = &resp->xdr;
3053         __be32 *p;
3054
3055         if (!nfserr) {
3056                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3057                 if (!p)
3058                         return nfserr_resource;
3059                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3060                                                 NFS4_MAX_SESSIONID_LEN);
3061                 *p++ = cpu_to_be32(bcts->dir);
3062                 /* Upshifting from TCP to RDMA is not supported */
3063                 *p++ = cpu_to_be32(0);
3064         }
3065         return nfserr;
3066 }
3067
3068 static __be32
3069 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3070 {
3071         struct xdr_stream *xdr = &resp->xdr;
3072
3073         if (!nfserr)
3074                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3075
3076         return nfserr;
3077 }
3078
3079
3080 static __be32
3081 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3082 {
3083         struct xdr_stream *xdr = &resp->xdr;
3084         __be32 *p;
3085
3086         if (!nfserr) {
3087                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3088                 if (!p)
3089                         return nfserr_resource;
3090                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3091                                                 NFS4_VERIFIER_SIZE);
3092         }
3093         return nfserr;
3094 }
3095
3096 static __be32
3097 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3098 {
3099         struct xdr_stream *xdr = &resp->xdr;
3100         __be32 *p;
3101
3102         if (!nfserr) {
3103                 p = xdr_reserve_space(xdr, 20);
3104                 if (!p)
3105                         return nfserr_resource;
3106                 encode_cinfo(p, &create->cr_cinfo);
3107                 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3108                                 create->cr_bmval[1], create->cr_bmval[2]);
3109         }
3110         return nfserr;
3111 }
3112
3113 static __be32
3114 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3115 {
3116         struct svc_fh *fhp = getattr->ga_fhp;
3117         struct xdr_stream *xdr = &resp->xdr;
3118
3119         if (nfserr)
3120                 return nfserr;
3121
3122         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3123                                     getattr->ga_bmval,
3124                                     resp->rqstp, 0);
3125         return nfserr;
3126 }
3127
3128 static __be32
3129 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3130 {
3131         struct xdr_stream *xdr = &resp->xdr;
3132         struct svc_fh *fhp = *fhpp;
3133         unsigned int len;
3134         __be32 *p;
3135
3136         if (!nfserr) {
3137                 len = fhp->fh_handle.fh_size;
3138                 p = xdr_reserve_space(xdr, len + 4);
3139                 if (!p)
3140                         return nfserr_resource;
3141                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3142         }
3143         return nfserr;
3144 }
3145
3146 /*
3147 * Including all fields other than the name, a LOCK4denied structure requires
3148 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3149 */
3150 static __be32
3151 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3152 {
3153         struct xdr_netobj *conf = &ld->ld_owner;
3154         __be32 *p;
3155
3156 again:
3157         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3158         if (!p) {
3159                 /*
3160                  * Don't fail to return the result just because we can't
3161                  * return the conflicting open:
3162                  */
3163                 if (conf->len) {
3164                         kfree(conf->data);
3165                         conf->len = 0;
3166                         conf->data = NULL;
3167                         goto again;
3168                 }
3169                 return nfserr_resource;
3170         }
3171         p = xdr_encode_hyper(p, ld->ld_start);
3172         p = xdr_encode_hyper(p, ld->ld_length);
3173         *p++ = cpu_to_be32(ld->ld_type);
3174         if (conf->len) {
3175                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3176                 p = xdr_encode_opaque(p, conf->data, conf->len);
3177                 kfree(conf->data);
3178         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3179                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3180                 *p++ = cpu_to_be32(0); /* length of owner name */
3181         }
3182         return nfserr_denied;
3183 }
3184
3185 static __be32
3186 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3187 {
3188         struct xdr_stream *xdr = &resp->xdr;
3189
3190         if (!nfserr)
3191                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3192         else if (nfserr == nfserr_denied)
3193                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3194
3195         return nfserr;
3196 }
3197
3198 static __be32
3199 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3200 {
3201         struct xdr_stream *xdr = &resp->xdr;
3202
3203         if (nfserr == nfserr_denied)
3204                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3205         return nfserr;
3206 }
3207
3208 static __be32
3209 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3210 {
3211         struct xdr_stream *xdr = &resp->xdr;
3212
3213         if (!nfserr)
3214                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3215
3216         return nfserr;
3217 }
3218
3219
3220 static __be32
3221 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3222 {
3223         struct xdr_stream *xdr = &resp->xdr;
3224         __be32 *p;
3225
3226         if (!nfserr) {
3227                 p = xdr_reserve_space(xdr, 20);
3228                 if (!p)
3229                         return nfserr_resource;
3230                 p = encode_cinfo(p, &link->li_cinfo);
3231         }
3232         return nfserr;
3233 }
3234
3235
3236 static __be32
3237 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3238 {
3239         struct xdr_stream *xdr = &resp->xdr;
3240         __be32 *p;
3241
3242         if (nfserr)
3243                 goto out;
3244
3245         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3246         if (nfserr)
3247                 goto out;
3248         p = xdr_reserve_space(xdr, 24);
3249         if (!p)
3250                 return nfserr_resource;
3251         p = encode_cinfo(p, &open->op_cinfo);
3252         *p++ = cpu_to_be32(open->op_rflags);
3253
3254         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3255                                         open->op_bmval[2]);
3256         if (nfserr)
3257                 goto out;
3258
3259         p = xdr_reserve_space(xdr, 4);
3260         if (!p)
3261                 return nfserr_resource;
3262
3263         *p++ = cpu_to_be32(open->op_delegate_type);
3264         switch (open->op_delegate_type) {
3265         case NFS4_OPEN_DELEGATE_NONE:
3266                 break;
3267         case NFS4_OPEN_DELEGATE_READ:
3268                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3269                 if (nfserr)
3270                         return nfserr;
3271                 p = xdr_reserve_space(xdr, 20);
3272                 if (!p)
3273                         return nfserr_resource;
3274                 *p++ = cpu_to_be32(open->op_recall);
3275
3276                 /*
3277                  * TODO: ACE's in delegations
3278                  */
3279                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3280                 *p++ = cpu_to_be32(0);
3281                 *p++ = cpu_to_be32(0);
3282                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3283                 break;
3284         case NFS4_OPEN_DELEGATE_WRITE:
3285                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3286                 if (nfserr)
3287                         return nfserr;
3288                 p = xdr_reserve_space(xdr, 32);
3289                 if (!p)
3290                         return nfserr_resource;
3291                 *p++ = cpu_to_be32(0);
3292
3293                 /*
3294                  * TODO: space_limit's in delegations
3295                  */
3296                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3297                 *p++ = cpu_to_be32(~(u32)0);
3298                 *p++ = cpu_to_be32(~(u32)0);
3299
3300                 /*
3301                  * TODO: ACE's in delegations
3302                  */
3303                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3304                 *p++ = cpu_to_be32(0);
3305                 *p++ = cpu_to_be32(0);
3306                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3307                 break;
3308         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3309                 switch (open->op_why_no_deleg) {
3310                 case WND4_CONTENTION:
3311                 case WND4_RESOURCE:
3312                         p = xdr_reserve_space(xdr, 8);
3313                         if (!p)
3314                                 return nfserr_resource;
3315                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3316                         /* deleg signaling not supported yet: */
3317                         *p++ = cpu_to_be32(0);
3318                         break;
3319                 default:
3320                         p = xdr_reserve_space(xdr, 4);
3321                         if (!p)
3322                                 return nfserr_resource;
3323                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3324                 }
3325                 break;
3326         default:
3327                 BUG();
3328         }
3329         /* XXX save filehandle here */
3330 out:
3331         return nfserr;
3332 }
3333
3334 static __be32
3335 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3336 {
3337         struct xdr_stream *xdr = &resp->xdr;
3338
3339         if (!nfserr)
3340                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3341
3342         return nfserr;
3343 }
3344
3345 static __be32
3346 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3347 {
3348         struct xdr_stream *xdr = &resp->xdr;
3349
3350         if (!nfserr)
3351                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3352
3353         return nfserr;
3354 }
3355
3356 static __be32 nfsd4_encode_splice_read(
3357                                 struct nfsd4_compoundres *resp,
3358                                 struct nfsd4_read *read,
3359                                 struct file *file, unsigned long maxcount)
3360 {
3361         struct xdr_stream *xdr = &resp->xdr;
3362         struct xdr_buf *buf = xdr->buf;
3363         u32 eof;
3364         long len;
3365         int space_left;
3366         __be32 nfserr;
3367         __be32 *p = xdr->p - 2;
3368
3369         /* Make sure there will be room for padding if needed */
3370         if (xdr->end - xdr->p < 1)
3371                 return nfserr_resource;
3372
3373         len = maxcount;
3374         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3375                                   read->rd_offset, &maxcount);
3376         if (nfserr) {
3377                 /*
3378                  * nfsd_splice_actor may have already messed with the
3379                  * page length; reset it so as not to confuse
3380                  * xdr_truncate_encode:
3381                  */
3382                 buf->page_len = 0;
3383                 return nfserr;
3384         }
3385
3386         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3387                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3388
3389         *(p++) = htonl(eof);
3390         *(p++) = htonl(maxcount);
3391
3392         buf->page_len = maxcount;
3393         buf->len += maxcount;
3394         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3395                                                         / PAGE_SIZE;
3396
3397         /* Use rest of head for padding and remaining ops: */
3398         buf->tail[0].iov_base = xdr->p;
3399         buf->tail[0].iov_len = 0;
3400         xdr->iov = buf->tail;
3401         if (maxcount&3) {
3402                 int pad = 4 - (maxcount&3);
3403
3404                 *(xdr->p++) = 0;
3405
3406                 buf->tail[0].iov_base += maxcount&3;
3407                 buf->tail[0].iov_len = pad;
3408                 buf->len += pad;
3409         }
3410
3411         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3412                                 buf->buflen - buf->len);
3413         buf->buflen = buf->len + space_left;
3414         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3415
3416         return 0;
3417 }
3418
3419 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3420                                  struct nfsd4_read *read,
3421                                  struct file *file, unsigned long maxcount)
3422 {
3423         struct xdr_stream *xdr = &resp->xdr;
3424         u32 eof;
3425         int v;
3426         int starting_len = xdr->buf->len - 8;
3427         long len;
3428         int thislen;
3429         __be32 nfserr;
3430         __be32 tmp;
3431         __be32 *p;
3432         u32 zzz = 0;
3433         int pad;
3434
3435         len = maxcount;
3436         v = 0;
3437
3438         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3439         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3440         WARN_ON_ONCE(!p);
3441         resp->rqstp->rq_vec[v].iov_base = p;
3442         resp->rqstp->rq_vec[v].iov_len = thislen;
3443         v++;
3444         len -= thislen;
3445
3446         while (len) {
3447                 thislen = min_t(long, len, PAGE_SIZE);
3448                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3449                 WARN_ON_ONCE(!p);
3450                 resp->rqstp->rq_vec[v].iov_base = p;
3451                 resp->rqstp->rq_vec[v].iov_len = thislen;
3452                 v++;
3453                 len -= thislen;
3454         }
3455         read->rd_vlen = v;
3456
3457         len = maxcount;
3458         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3459                         read->rd_vlen, &maxcount);
3460         if (nfserr)
3461                 return nfserr;
3462         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3463
3464         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3465                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3466
3467         tmp = htonl(eof);
3468         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3469         tmp = htonl(maxcount);
3470         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3471
3472         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3473         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3474                                                                 &zzz, pad);
3475         return 0;
3476
3477 }
3478
3479 static __be32
3480 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3481                   struct nfsd4_read *read)
3482 {
3483         unsigned long maxcount;
3484         struct xdr_stream *xdr = &resp->xdr;
3485         struct file *file = read->rd_filp;
3486         int starting_len = xdr->buf->len;
3487         struct raparms *ra = NULL;
3488         __be32 *p;
3489
3490         if (nfserr)
3491                 goto out;
3492
3493         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3494         if (!p) {
3495                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3496                 nfserr = nfserr_resource;
3497                 goto out;
3498         }
3499         if (resp->xdr.buf->page_len &&
3500             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3501                 WARN_ON_ONCE(1);
3502                 nfserr = nfserr_resource;
3503                 goto out;
3504         }
3505         xdr_commit_encode(xdr);
3506
3507         maxcount = svc_max_payload(resp->rqstp);
3508         maxcount = min_t(unsigned long, maxcount,
3509                          (xdr->buf->buflen - xdr->buf->len));
3510         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3511
3512         if (read->rd_tmp_file)
3513                 ra = nfsd_init_raparms(file);
3514
3515         if (file->f_op->splice_read &&
3516             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3517                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3518         else
3519                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3520
3521         if (ra)
3522                 nfsd_put_raparams(file, ra);
3523
3524         if (nfserr)
3525                 xdr_truncate_encode(xdr, starting_len);
3526
3527 out:
3528         if (file)
3529                 fput(file);
3530         return nfserr;
3531 }
3532
3533 static __be32
3534 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3535 {
3536         int maxcount;
3537         __be32 wire_count;
3538         int zero = 0;
3539         struct xdr_stream *xdr = &resp->xdr;
3540         int length_offset = xdr->buf->len;
3541         __be32 *p;
3542
3543         if (nfserr)
3544                 return nfserr;
3545
3546         p = xdr_reserve_space(xdr, 4);
3547         if (!p)
3548                 return nfserr_resource;
3549         maxcount = PAGE_SIZE;
3550
3551         p = xdr_reserve_space(xdr, maxcount);
3552         if (!p)
3553                 return nfserr_resource;
3554         /*
3555          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3556          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3557          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3558          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3559          */
3560         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3561                                                 (char *)p, &maxcount);
3562         if (nfserr == nfserr_isdir)
3563                 nfserr = nfserr_inval;
3564         if (nfserr) {
3565                 xdr_truncate_encode(xdr, length_offset);
3566                 return nfserr;
3567         }
3568
3569         wire_count = htonl(maxcount);
3570         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3571         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3572         if (maxcount & 3)
3573                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3574                                                 &zero, 4 - (maxcount&3));
3575         return 0;
3576 }
3577
3578 static __be32
3579 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3580 {
3581         int maxcount;
3582         int bytes_left;
3583         loff_t offset;
3584         __be64 wire_offset;
3585         struct xdr_stream *xdr = &resp->xdr;
3586         int starting_len = xdr->buf->len;
3587         __be32 *p;
3588
3589         if (nfserr)
3590                 return nfserr;
3591
3592         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3593         if (!p)
3594                 return nfserr_resource;
3595
3596         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3597         *p++ = cpu_to_be32(0);
3598         *p++ = cpu_to_be32(0);
3599         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3600                                 - (char *)resp->xdr.buf->head[0].iov_base;
3601
3602         /*
3603          * Number of bytes left for directory entries allowing for the
3604          * final 8 bytes of the readdir and a following failed op:
3605          */
3606         bytes_left = xdr->buf->buflen - xdr->buf->len
3607                         - COMPOUND_ERR_SLACK_SPACE - 8;
3608         if (bytes_left < 0) {
3609                 nfserr = nfserr_resource;
3610                 goto err_no_verf;
3611         }
3612         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3613         /*
3614          * Note the rfc defines rd_maxcount as the size of the
3615          * READDIR4resok structure, which includes the verifier above
3616          * and the 8 bytes encoded at the end of this function:
3617          */
3618         if (maxcount < 16) {
3619                 nfserr = nfserr_toosmall;
3620                 goto err_no_verf;
3621         }
3622         maxcount = min_t(int, maxcount-16, bytes_left);
3623
3624         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3625         if (!readdir->rd_dircount)
3626                 readdir->rd_dircount = INT_MAX;
3627
3628         readdir->xdr = xdr;
3629         readdir->rd_maxcount = maxcount;
3630         readdir->common.err = 0;
3631         readdir->cookie_offset = 0;
3632
3633         offset = readdir->rd_cookie;
3634         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3635                               &offset,
3636                               &readdir->common, nfsd4_encode_dirent);
3637         if (nfserr == nfs_ok &&
3638             readdir->common.err == nfserr_toosmall &&
3639             xdr->buf->len == starting_len + 8) {
3640                 /* nothing encoded; which limit did we hit?: */
3641                 if (maxcount - 16 < bytes_left)
3642                         /* It was the fault of rd_maxcount: */
3643                         nfserr = nfserr_toosmall;
3644                 else
3645                         /* We ran out of buffer space: */
3646                         nfserr = nfserr_resource;
3647         }
3648         if (nfserr)
3649                 goto err_no_verf;
3650
3651         if (readdir->cookie_offset) {
3652                 wire_offset = cpu_to_be64(offset);
3653                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3654                                                         &wire_offset, 8);
3655         }
3656
3657         p = xdr_reserve_space(xdr, 8);
3658         if (!p) {
3659                 WARN_ON_ONCE(1);
3660                 goto err_no_verf;
3661         }
3662         *p++ = 0;       /* no more entries */
3663         *p++ = htonl(readdir->common.err == nfserr_eof);
3664
3665         return 0;
3666 err_no_verf:
3667         xdr_truncate_encode(xdr, starting_len);
3668         return nfserr;
3669 }
3670
3671 static __be32
3672 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3673 {
3674         struct xdr_stream *xdr = &resp->xdr;
3675         __be32 *p;
3676
3677         if (!nfserr) {
3678                 p = xdr_reserve_space(xdr, 20);
3679                 if (!p)
3680                         return nfserr_resource;
3681                 p = encode_cinfo(p, &remove->rm_cinfo);
3682         }
3683         return nfserr;
3684 }
3685
3686 static __be32
3687 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3688 {
3689         struct xdr_stream *xdr = &resp->xdr;
3690         __be32 *p;
3691
3692         if (!nfserr) {
3693                 p = xdr_reserve_space(xdr, 40);
3694                 if (!p)
3695                         return nfserr_resource;
3696                 p = encode_cinfo(p, &rename->rn_sinfo);
3697                 p = encode_cinfo(p, &rename->rn_tinfo);
3698         }
3699         return nfserr;
3700 }
3701
3702 static __be32
3703 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3704                          __be32 nfserr, struct svc_export *exp)
3705 {
3706         u32 i, nflavs, supported;
3707         struct exp_flavor_info *flavs;
3708         struct exp_flavor_info def_flavs[2];
3709         __be32 *p, *flavorsp;
3710         static bool report = true;
3711
3712         if (nfserr)
3713                 goto out;
3714         nfserr = nfserr_resource;
3715         if (exp->ex_nflavors) {
3716                 flavs = exp->ex_flavors;
3717                 nflavs = exp->ex_nflavors;
3718         } else { /* Handling of some defaults in absence of real secinfo: */
3719                 flavs = def_flavs;
3720                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3721                         nflavs = 2;
3722                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3723                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3724                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3725                         nflavs = 1;
3726                         flavs[0].pseudoflavor
3727                                         = svcauth_gss_flavor(exp->ex_client);
3728                 } else {
3729                         nflavs = 1;
3730                         flavs[0].pseudoflavor
3731                                         = exp->ex_client->flavour->flavour;
3732                 }
3733         }
3734
3735         supported = 0;
3736         p = xdr_reserve_space(xdr, 4);
3737         if (!p)
3738                 goto out;
3739         flavorsp = p++;         /* to be backfilled later */
3740
3741         for (i = 0; i < nflavs; i++) {
3742                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3743                 struct rpcsec_gss_info info;
3744
3745                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3746                         supported++;
3747                         p = xdr_reserve_space(xdr, 4 + 4 +
3748                                               XDR_LEN(info.oid.len) + 4 + 4);
3749                         if (!p)
3750                                 goto out;
3751                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3752                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3753                         *p++ = cpu_to_be32(info.qop);
3754                         *p++ = cpu_to_be32(info.service);
3755                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3756                         supported++;
3757                         p = xdr_reserve_space(xdr, 4);
3758                         if (!p)
3759                                 goto out;
3760                         *p++ = cpu_to_be32(pf);
3761                 } else {
3762                         if (report)
3763                                 pr_warn("NFS: SECINFO: security flavor %u "
3764                                         "is not supported\n", pf);
3765                 }
3766         }
3767
3768         if (nflavs != supported)
3769                 report = false;
3770         *flavorsp = htonl(supported);
3771         nfserr = 0;
3772 out:
3773         if (exp)
3774                 exp_put(exp);
3775         return nfserr;
3776 }
3777
3778 static __be32
3779 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3780                      struct nfsd4_secinfo *secinfo)
3781 {
3782         struct xdr_stream *xdr = &resp->xdr;
3783
3784         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3785 }
3786
3787 static __be32
3788 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3789                      struct nfsd4_secinfo_no_name *secinfo)
3790 {
3791         struct xdr_stream *xdr = &resp->xdr;
3792
3793         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3794 }
3795
3796 /*
3797  * The SETATTR encode routine is special -- it always encodes a bitmap,
3798  * regardless of the error status.
3799  */
3800 static __be32
3801 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3802 {
3803         struct xdr_stream *xdr = &resp->xdr;
3804         __be32 *p;
3805
3806         p = xdr_reserve_space(xdr, 16);
3807         if (!p)
3808                 return nfserr_resource;
3809         if (nfserr) {
3810                 *p++ = cpu_to_be32(3);
3811                 *p++ = cpu_to_be32(0);
3812                 *p++ = cpu_to_be32(0);
3813                 *p++ = cpu_to_be32(0);
3814         }
3815         else {
3816                 *p++ = cpu_to_be32(3);
3817                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3818                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3819                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3820         }
3821         return nfserr;
3822 }
3823
3824 static __be32
3825 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3826 {
3827         struct xdr_stream *xdr = &resp->xdr;
3828         __be32 *p;
3829
3830         if (!nfserr) {
3831                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3832                 if (!p)
3833                         return nfserr_resource;
3834                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3835                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3836                                                 NFS4_VERIFIER_SIZE);
3837         }
3838         else if (nfserr == nfserr_clid_inuse) {
3839                 p = xdr_reserve_space(xdr, 8);
3840                 if (!p)
3841                         return nfserr_resource;
3842                 *p++ = cpu_to_be32(0);
3843                 *p++ = cpu_to_be32(0);
3844         }
3845         return nfserr;
3846 }
3847
3848 static __be32
3849 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3850 {
3851         struct xdr_stream *xdr = &resp->xdr;
3852         __be32 *p;
3853
3854         if (!nfserr) {
3855                 p = xdr_reserve_space(xdr, 16);
3856                 if (!p)
3857                         return nfserr_resource;
3858                 *p++ = cpu_to_be32(write->wr_bytes_written);
3859                 *p++ = cpu_to_be32(write->wr_how_written);
3860                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3861                                                         NFS4_VERIFIER_SIZE);
3862         }
3863         return nfserr;
3864 }
3865
3866 static __be32
3867 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3868                          struct nfsd4_exchange_id *exid)
3869 {
3870         struct xdr_stream *xdr = &resp->xdr;
3871         __be32 *p;
3872         char *major_id;
3873         char *server_scope;
3874         int major_id_sz;
3875         int server_scope_sz;
3876         int status = 0;
3877         uint64_t minor_id = 0;
3878
3879         if (nfserr)
3880                 return nfserr;
3881
3882         major_id = utsname()->nodename;
3883         major_id_sz = strlen(major_id);
3884         server_scope = utsname()->nodename;
3885         server_scope_sz = strlen(server_scope);
3886
3887         p = xdr_reserve_space(xdr,
3888                 8 /* eir_clientid */ +
3889                 4 /* eir_sequenceid */ +
3890                 4 /* eir_flags */ +
3891                 4 /* spr_how */);
3892         if (!p)
3893                 return nfserr_resource;
3894
3895         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3896         *p++ = cpu_to_be32(exid->seqid);
3897         *p++ = cpu_to_be32(exid->flags);
3898
3899         *p++ = cpu_to_be32(exid->spa_how);
3900
3901         switch (exid->spa_how) {
3902         case SP4_NONE:
3903                 break;
3904         case SP4_MACH_CRED:
3905                 /* spo_must_enforce bitmap: */
3906                 status = nfsd4_encode_bitmap(xdr,
3907                                         exid->spo_must_enforce[0],
3908                                         exid->spo_must_enforce[1],
3909                                         exid->spo_must_enforce[2]);
3910                 if (status)
3911                         goto out;
3912                 /* spo_must_allow bitmap: */
3913                 status = nfsd4_encode_bitmap(xdr,
3914                                         exid->spo_must_allow[0],
3915                                         exid->spo_must_allow[1],
3916                                         exid->spo_must_allow[2]);
3917                 if (status)
3918                         goto out;
3919                 break;
3920         default:
3921                 WARN_ON_ONCE(1);
3922         }
3923
3924         p = xdr_reserve_space(xdr,
3925                 8 /* so_minor_id */ +
3926                 4 /* so_major_id.len */ +
3927                 (XDR_QUADLEN(major_id_sz) * 4) +
3928                 4 /* eir_server_scope.len */ +
3929                 (XDR_QUADLEN(server_scope_sz) * 4) +
3930                 4 /* eir_server_impl_id.count (0) */);
3931         if (!p)
3932                 return nfserr_resource;
3933
3934         /* The server_owner struct */
3935         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3936         /* major id */
3937         p = xdr_encode_opaque(p, major_id, major_id_sz);
3938
3939         /* Server scope */
3940         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3941
3942         /* Implementation id */
3943         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3944         return 0;
3945 out:
3946         return status;
3947 }
3948
3949 static __be32
3950 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3951                             struct nfsd4_create_session *sess)
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, 24);
3960         if (!p)
3961                 return nfserr_resource;
3962         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3963                                         NFS4_MAX_SESSIONID_LEN);
3964         *p++ = cpu_to_be32(sess->seqid);
3965         *p++ = cpu_to_be32(sess->flags);
3966
3967         p = xdr_reserve_space(xdr, 28);
3968         if (!p)
3969                 return nfserr_resource;
3970         *p++ = cpu_to_be32(0); /* headerpadsz */
3971         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3972         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3973         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3974         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3975         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3976         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3977
3978         if (sess->fore_channel.nr_rdma_attrs) {
3979                 p = xdr_reserve_space(xdr, 4);
3980                 if (!p)
3981                         return nfserr_resource;
3982                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3983         }
3984
3985         p = xdr_reserve_space(xdr, 28);
3986         if (!p)
3987                 return nfserr_resource;
3988         *p++ = cpu_to_be32(0); /* headerpadsz */
3989         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3990         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3991         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3992         *p++ = cpu_to_be32(sess->back_channel.maxops);
3993         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3994         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3995
3996         if (sess->back_channel.nr_rdma_attrs) {
3997                 p = xdr_reserve_space(xdr, 4);
3998                 if (!p)
3999                         return nfserr_resource;
4000                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4001         }
4002         return 0;
4003 }
4004
4005 static __be32
4006 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4007                       struct nfsd4_sequence *seq)
4008 {
4009         struct xdr_stream *xdr = &resp->xdr;
4010         __be32 *p;
4011
4012         if (nfserr)
4013                 return nfserr;
4014
4015         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4016         if (!p)
4017                 return nfserr_resource;
4018         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4019                                         NFS4_MAX_SESSIONID_LEN);
4020         *p++ = cpu_to_be32(seq->seqid);
4021         *p++ = cpu_to_be32(seq->slotid);
4022         /* Note slotid's are numbered from zero: */
4023         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4024         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4025         *p++ = cpu_to_be32(seq->status_flags);
4026
4027         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4028         return 0;
4029 }
4030
4031 static __be32
4032 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4033                           struct nfsd4_test_stateid *test_stateid)
4034 {
4035         struct xdr_stream *xdr = &resp->xdr;
4036         struct nfsd4_test_stateid_id *stateid, *next;
4037         __be32 *p;
4038
4039         if (nfserr)
4040                 return nfserr;
4041
4042         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4043         if (!p)
4044                 return nfserr_resource;
4045         *p++ = htonl(test_stateid->ts_num_ids);
4046
4047         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4048                 *p++ = stateid->ts_id_status;
4049         }
4050
4051         return nfserr;
4052 }
4053
4054 #ifdef CONFIG_NFSD_PNFS
4055 static __be32
4056 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4057                 struct nfsd4_getdeviceinfo *gdev)
4058 {
4059         struct xdr_stream *xdr = &resp->xdr;
4060         const struct nfsd4_layout_ops *ops =
4061                 nfsd4_layout_ops[gdev->gd_layout_type];
4062         u32 starting_len = xdr->buf->len, needed_len;
4063         __be32 *p;
4064
4065         dprintk("%s: err %d\n", __func__, nfserr);
4066         if (nfserr)
4067                 goto out;
4068
4069         nfserr = nfserr_resource;
4070         p = xdr_reserve_space(xdr, 4);
4071         if (!p)
4072                 goto out;
4073
4074         *p++ = cpu_to_be32(gdev->gd_layout_type);
4075
4076         /* If maxcount is 0 then just update notifications */
4077         if (gdev->gd_maxcount != 0) {
4078                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4079                 if (nfserr) {
4080                         /*
4081                          * We don't bother to burden the layout drivers with
4082                          * enforcing gd_maxcount, just tell the client to
4083                          * come back with a bigger buffer if it's not enough.
4084                          */
4085                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4086                                 goto toosmall;
4087                         goto out;
4088                 }
4089         }
4090
4091         nfserr = nfserr_resource;
4092         if (gdev->gd_notify_types) {
4093                 p = xdr_reserve_space(xdr, 4 + 4);
4094                 if (!p)
4095                         goto out;
4096                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4097                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4098         } else {
4099                 p = xdr_reserve_space(xdr, 4);
4100                 if (!p)
4101                         goto out;
4102                 *p++ = 0;
4103         }
4104
4105         nfserr = 0;
4106 out:
4107         kfree(gdev->gd_device);
4108         dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4109         return nfserr;
4110
4111 toosmall:
4112         dprintk("%s: maxcount too small\n", __func__);
4113         needed_len = xdr->buf->len + 4 /* notifications */;
4114         xdr_truncate_encode(xdr, starting_len);
4115         p = xdr_reserve_space(xdr, 4);
4116         if (!p) {
4117                 nfserr = nfserr_resource;
4118         } else {
4119                 *p++ = cpu_to_be32(needed_len);
4120                 nfserr = nfserr_toosmall;
4121         }
4122         goto out;
4123 }
4124
4125 static __be32
4126 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4127                 struct nfsd4_layoutget *lgp)
4128 {
4129         struct xdr_stream *xdr = &resp->xdr;
4130         const struct nfsd4_layout_ops *ops =
4131                 nfsd4_layout_ops[lgp->lg_layout_type];
4132         __be32 *p;
4133
4134         dprintk("%s: err %d\n", __func__, nfserr);
4135         if (nfserr)
4136                 goto out;
4137
4138         nfserr = nfserr_resource;
4139         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4140         if (!p)
4141                 goto out;
4142
4143         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4144         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4145         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4146                                     sizeof(stateid_opaque_t));
4147
4148         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4149         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4150         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4151         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4152         *p++ = cpu_to_be32(lgp->lg_layout_type);
4153
4154         nfserr = ops->encode_layoutget(xdr, lgp);
4155 out:
4156         kfree(lgp->lg_content);
4157         return nfserr;
4158 }
4159
4160 static __be32
4161 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4162                           struct nfsd4_layoutcommit *lcp)
4163 {
4164         struct xdr_stream *xdr = &resp->xdr;
4165         __be32 *p;
4166
4167         if (nfserr)
4168                 return nfserr;
4169
4170         p = xdr_reserve_space(xdr, 4);
4171         if (!p)
4172                 return nfserr_resource;
4173         *p++ = cpu_to_be32(lcp->lc_size_chg);
4174         if (lcp->lc_size_chg) {
4175                 p = xdr_reserve_space(xdr, 8);
4176                 if (!p)
4177                         return nfserr_resource;
4178                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4179         }
4180
4181         return nfs_ok;
4182 }
4183
4184 static __be32
4185 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4186                 struct nfsd4_layoutreturn *lrp)
4187 {
4188         struct xdr_stream *xdr = &resp->xdr;
4189         __be32 *p;
4190
4191         if (nfserr)
4192                 return nfserr;
4193
4194         p = xdr_reserve_space(xdr, 4);
4195         if (!p)
4196                 return nfserr_resource;
4197         *p++ = cpu_to_be32(lrp->lrs_present);
4198         if (lrp->lrs_present)
4199                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4200         return nfs_ok;
4201 }
4202 #endif /* CONFIG_NFSD_PNFS */
4203
4204 static __be32
4205 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4206                   struct nfsd4_seek *seek)
4207 {
4208         __be32 *p;
4209
4210         if (nfserr)
4211                 return nfserr;
4212
4213         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4214         *p++ = cpu_to_be32(seek->seek_eof);
4215         p = xdr_encode_hyper(p, seek->seek_pos);
4216
4217         return nfserr;
4218 }
4219
4220 static __be32
4221 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4222 {
4223         return nfserr;
4224 }
4225
4226 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4227
4228 /*
4229  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4230  * since we don't need to filter out obsolete ops as this is
4231  * done in the decoding phase.
4232  */
4233 static nfsd4_enc nfsd4_enc_ops[] = {
4234         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4235         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4236         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4237         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4238         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4239         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4240         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4241         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4242         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4243         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4244         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4245         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4246         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4247         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4248         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4249         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4250         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4251         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4252         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4253         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4254         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4255         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4256         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4257         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4258         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4259         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4260         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4261         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4262         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4263         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4264         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4265         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4266         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4267         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4268         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4269         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4270         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4271
4272         /* NFSv4.1 operations */
4273         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4274         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4275         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4276         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4277         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4278         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4279         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4280 #ifdef CONFIG_NFSD_PNFS
4281         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4282         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4283         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4284         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4285         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4286 #else
4287         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4288         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4289         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4290         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4291         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4292 #endif
4293         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4294         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4295         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4296         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4297         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4298         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4299         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4300
4301         /* NFSv4.2 operations */
4302         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4303         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_noop,
4304         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4305         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4306         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4307         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4308         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4309         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4310         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4311         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4312         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4313         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4314         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4315 };
4316
4317 /*
4318  * Calculate whether we still have space to encode repsize bytes.
4319  * There are two considerations:
4320  *     - For NFS versions >=4.1, the size of the reply must stay within
4321  *       session limits
4322  *     - For all NFS versions, we must stay within limited preallocated
4323  *       buffer space.
4324  *
4325  * This is called before the operation is processed, so can only provide
4326  * an upper estimate.  For some nonidempotent operations (such as
4327  * getattr), it's not necessarily a problem if that estimate is wrong,
4328  * as we can fail it after processing without significant side effects.
4329  */
4330 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4331 {
4332         struct xdr_buf *buf = &resp->rqstp->rq_res;
4333         struct nfsd4_slot *slot = resp->cstate.slot;
4334
4335         if (buf->len + respsize <= buf->buflen)
4336                 return nfs_ok;
4337         if (!nfsd4_has_session(&resp->cstate))
4338                 return nfserr_resource;
4339         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4340                 WARN_ON_ONCE(1);
4341                 return nfserr_rep_too_big_to_cache;
4342         }
4343         return nfserr_rep_too_big;
4344 }
4345
4346 void
4347 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4348 {
4349         struct xdr_stream *xdr = &resp->xdr;
4350         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4351         struct svc_rqst *rqstp = resp->rqstp;
4352         int post_err_offset;
4353         nfsd4_enc encoder;
4354         __be32 *p;
4355
4356         p = xdr_reserve_space(xdr, 8);
4357         if (!p) {
4358                 WARN_ON_ONCE(1);
4359                 return;
4360         }
4361         *p++ = cpu_to_be32(op->opnum);
4362         post_err_offset = xdr->buf->len;
4363
4364         if (op->opnum == OP_ILLEGAL)
4365                 goto status;
4366         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4367                !nfsd4_enc_ops[op->opnum]);
4368         encoder = nfsd4_enc_ops[op->opnum];
4369         op->status = encoder(resp, op->status, &op->u);
4370         xdr_commit_encode(xdr);
4371
4372         /* nfsd4_check_resp_size guarantees enough room for error status */
4373         if (!op->status) {
4374                 int space_needed = 0;
4375                 if (!nfsd4_last_compound_op(rqstp))
4376                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4377                 op->status = nfsd4_check_resp_size(resp, space_needed);
4378         }
4379         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4380                 struct nfsd4_slot *slot = resp->cstate.slot;
4381
4382                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4383                         op->status = nfserr_rep_too_big_to_cache;
4384                 else
4385                         op->status = nfserr_rep_too_big;
4386         }
4387         if (op->status == nfserr_resource ||
4388             op->status == nfserr_rep_too_big ||
4389             op->status == nfserr_rep_too_big_to_cache) {
4390                 /*
4391                  * The operation may have already been encoded or
4392                  * partially encoded.  No op returns anything additional
4393                  * in the case of one of these three errors, so we can
4394                  * just truncate back to after the status.  But it's a
4395                  * bug if we had to do this on a non-idempotent op:
4396                  */
4397                 warn_on_nonidempotent_op(op);
4398                 xdr_truncate_encode(xdr, post_err_offset);
4399         }
4400         if (so) {
4401                 int len = xdr->buf->len - post_err_offset;
4402
4403                 so->so_replay.rp_status = op->status;
4404                 so->so_replay.rp_buflen = len;
4405                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4406                                                 so->so_replay.rp_buf, len);
4407         }
4408 status:
4409         /* Note that op->status is already in network byte order: */
4410         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4411 }
4412
4413 /*
4414  * Encode the reply stored in the stateowner reply cache
4415  *
4416  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4417  * previously sent already encoded operation.
4418  */
4419 void
4420 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4421 {
4422         __be32 *p;
4423         struct nfs4_replay *rp = op->replay;
4424
4425         BUG_ON(!rp);
4426
4427         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4428         if (!p) {
4429                 WARN_ON_ONCE(1);
4430                 return;
4431         }
4432         *p++ = cpu_to_be32(op->opnum);
4433         *p++ = rp->rp_status;  /* already xdr'ed */
4434
4435         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4436 }
4437
4438 int
4439 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4440 {
4441         return xdr_ressize_check(rqstp, p);
4442 }
4443
4444 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4445 {
4446         struct svc_rqst *rqstp = rq;
4447         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4448
4449         if (args->ops != args->iops) {
4450                 kfree(args->ops);
4451                 args->ops = args->iops;
4452         }
4453         kfree(args->tmpp);
4454         args->tmpp = NULL;
4455         while (args->to_free) {
4456                 struct svcxdr_tmpbuf *tb = args->to_free;
4457                 args->to_free = tb->next;
4458                 kfree(tb);
4459         }
4460         return 1;
4461 }
4462
4463 int
4464 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4465 {
4466         if (rqstp->rq_arg.head[0].iov_len % 4) {
4467                 /* client is nuts */
4468                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4469                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4470                 return 0;
4471         }
4472         args->p = p;
4473         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4474         args->pagelist = rqstp->rq_arg.pages;
4475         args->pagelen = rqstp->rq_arg.page_len;
4476         args->tmpp = NULL;
4477         args->to_free = NULL;
4478         args->ops = args->iops;
4479         args->rqstp = rqstp;
4480
4481         return !nfsd4_decode_compound(args);
4482 }
4483
4484 int
4485 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4486 {
4487         /*
4488          * All that remains is to write the tag and operation count...
4489          */
4490         struct xdr_buf *buf = resp->xdr.buf;
4491
4492         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4493                                  buf->tail[0].iov_len);
4494
4495         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4496
4497         p = resp->tagp;
4498         *p++ = htonl(resp->taglen);
4499         memcpy(p, resp->tag, resp->taglen);
4500         p += XDR_QUADLEN(resp->taglen);
4501         *p++ = htonl(resp->opcnt);
4502
4503         nfsd4_sequence_done(resp);
4504         return 1;
4505 }
4506
4507 /*
4508  * Local variables:
4509  *  c-basic-offset: 8
4510  * End:
4511  */