fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 #include <linux/slab.h>
  37 #include <linux/namei.h>
  38 #include <linux/statfs.h>
  39 #include <linux/utsname.h>
  40 #include <linux/pagemap.h>
  41 #include <linux/sunrpc/svcauth_gss.h>
  42
  43 #include "idmap.h"
  44 #include "acl.h"
  45 #include "xdr4.h"
  46 #include "vfs.h"
  47 #include "state.h"
  48 #include "cache.h"
  49 #include "netns.h"
  50 #include "pnfs.h"
  51
  52 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  53 #include <linux/security.h>
  54 #endif
  55
  56
  57 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  58
  59 /*
  60  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  61  * directory in order to indicate to the client that a filesystem boundary is present
  62  * We use a fixed fsid for a referral
  63  */
  64 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  65 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  66
  67 static __be32
  68 check_filename(char *str, int len)
  69 {
  70         int i;
  71
  72         if (len == 0)
  73                 return nfserr_inval;
  74         if (isdotent(str, len))
  75                 return nfserr_badname;
  76         for (i = 0; i < len; i++)
  77                 if (str[i] == '/')
  78                         return nfserr_badname;
  79         return 0;
  80 }
  81
  82 #define DECODE_HEAD                             \
  83         __be32 *p;                              \
  84         __be32 status
  85 #define DECODE_TAIL                             \
  86         status = 0;                             \
  87 out:                                            \
  88         return status;                          \
  89 xdr_error:                                      \
  90         dprintk("NFSD: xdr error (%s:%d)\n",    \
  91                         __FILE__, __LINE__);    \
  92         status = nfserr_bad_xdr;                \
  93         goto out
  94
  95 #define READMEM(x,nbytes) do {                  \
  96         x = (char *)p;                          \
  97         p += XDR_QUADLEN(nbytes);               \
  98 } while (0)
  99 #define SAVEMEM(x,nbytes) do {                  \
 100         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 101                 savemem(argp, p, nbytes) :      \
 102                 (char *)p)) {                   \
 103                 dprintk("NFSD: xdr error (%s:%d)\n", \
 104                                 __FILE__, __LINE__); \
 105                 goto xdr_error;                 \
 106                 }                               \
 107         p += XDR_QUADLEN(nbytes);               \
 108 } while (0)
 109 #define COPYMEM(x,nbytes) do {                  \
 110         memcpy((x), p, nbytes);                 \
 111         p += XDR_QUADLEN(nbytes);               \
 112 } while (0)
 113
 114 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 115 #define READ_BUF(nbytes)  do {                  \
 116         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 117                 p = argp->p;                    \
 118                 argp->p += XDR_QUADLEN(nbytes); \
 119         } else if (!(p = read_buf(argp, nbytes))) { \
 120                 dprintk("NFSD: xdr error (%s:%d)\n", \
 121                                 __FILE__, __LINE__); \
 122                 goto xdr_error;                 \
 123         }                                       \
 124 } while (0)
 125
 126 static void next_decode_page(struct nfsd4_compoundargs *argp)
 127 {
 128         argp->p = page_address(argp->pagelist[0]);
 129         argp->pagelist++;
 130         if (argp->pagelen < PAGE_SIZE) {
 131                 argp->end = argp->p + (argp->pagelen>>2);
 132                 argp->pagelen = 0;
 133         } else {
 134                 argp->end = argp->p + (PAGE_SIZE>>2);
 135                 argp->pagelen -= PAGE_SIZE;
 136         }
 137 }
 138
 139 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 140 {
 141         /* We want more bytes than seem to be available.
 142          * Maybe we need a new page, maybe we have just run out
 143          */
 144         unsigned int avail = (char *)argp->end - (char *)argp->p;
 145         __be32 *p;
 146         if (avail + argp->pagelen < nbytes)
 147                 return NULL;
 148         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 149                 return NULL;
 150         /* ok, we can do it with the current plus the next page */
 151         if (nbytes <= sizeof(argp->tmp))
 152                 p = argp->tmp;
 153         else {
 154                 kfree(argp->tmpp);
 155                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 156                 if (!p)
 157                         return NULL;
 158
 159         }
 160         /*
 161          * The following memcpy is safe because read_buf is always
 162          * called with nbytes > avail, and the two cases above both
 163          * guarantee p points to at least nbytes bytes.
 164          */
 165         memcpy(p, argp->p, avail);
 166         next_decode_page(argp);
 167         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 168         argp->p += XDR_QUADLEN(nbytes - avail);
 169         return p;
 170 }
 171
 172 static int zero_clientid(clientid_t *clid)
 173 {
 174         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 175 }
 176
 177 /**
 178  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 179  * @argp: NFSv4 compound argument structure
 180  * @p: pointer to be freed (with kfree())
 181  *
 182  * Marks @p to be freed when processing the compound operation
 183  * described in @argp finishes.
 184  */
 185 static void *
 186 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 187 {
 188         struct svcxdr_tmpbuf *tb;
 189
 190         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 191         if (!tb)
 192                 return NULL;
 193         tb->next = argp->to_free;
 194         argp->to_free = tb;
 195         return tb->buf;
 196 }
 197
 198 /*
 199  * For xdr strings that need to be passed to other kernel api's
 200  * as null-terminated strings.
 201  *
 202  * Note null-terminating in place usually isn't safe since the
 203  * buffer might end on a page boundary.
 204  */
 205 static char *
 206 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 207 {
 208         char *p = svcxdr_tmpalloc(argp, len + 1);
 209
 210         if (!p)
 211                 return NULL;
 212         memcpy(p, buf, len);
 213         p[len] = '\0';
 214         return p;
 215 }
 216
 217 /**
 218  * savemem - duplicate a chunk of memory for later processing
 219  * @argp: NFSv4 compound argument structure to be freed with
 220  * @p: pointer to be duplicated
 221  * @nbytes: length to be duplicated
 222  *
 223  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 224  * that are preserved until processing of the NFSv4 compound
 225  * operation described by @argp finishes.
 226  */
 227 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 228 {
 229         void *ret;
 230
 231         ret = svcxdr_tmpalloc(argp, nbytes);
 232         if (!ret)
 233                 return NULL;
 234         memcpy(ret, p, nbytes);
 235         return ret;
 236 }
 237
 238 /*
 239  * We require the high 32 bits of 'seconds' to be 0, and
 240  * we ignore all 32 bits of 'nseconds'.
 241  */
 242 static __be32
 243 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
 244 {
 245         DECODE_HEAD;
 246         u64 sec;
 247
 248         READ_BUF(12);
 249         p = xdr_decode_hyper(p, &sec);
 250         tv->tv_sec = sec;
 251         tv->tv_nsec = be32_to_cpup(p++);
 252         if (tv->tv_nsec >= (u32)1000000000)
 253                 return nfserr_inval;
 254
 255         DECODE_TAIL;
 256 }
 257
 258 static __be32
 259 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 260 {
 261         u32 bmlen;
 262         DECODE_HEAD;
 263
 264         bmval[0] = 0;
 265         bmval[1] = 0;
 266         bmval[2] = 0;
 267
 268         READ_BUF(4);
 269         bmlen = be32_to_cpup(p++);
 270         if (bmlen > 1000)
 271                 goto xdr_error;
 272
 273         READ_BUF(bmlen << 2);
 274         if (bmlen > 0)
 275                 bmval[0] = be32_to_cpup(p++);
 276         if (bmlen > 1)
 277                 bmval[1] = be32_to_cpup(p++);
 278         if (bmlen > 2)
 279                 bmval[2] = be32_to_cpup(p++);
 280
 281         DECODE_TAIL;
 282 }
 283
 284 static __be32
 285 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 286                    struct iattr *iattr, struct nfs4_acl **acl,
 287                    struct xdr_netobj *label)
 288 {
 289         int expected_len, len = 0;
 290         u32 dummy32;
 291         char *buf;
 292
 293         DECODE_HEAD;
 294         iattr->ia_valid = 0;
 295         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 296                 return status;
 297
 298         READ_BUF(4);
 299         expected_len = be32_to_cpup(p++);
 300
 301         if (bmval[0] & FATTR4_WORD0_SIZE) {
 302                 READ_BUF(8);
 303                 len += 8;
 304                 p = xdr_decode_hyper(p, &iattr->ia_size);
 305                 iattr->ia_valid |= ATTR_SIZE;
 306         }
 307         if (bmval[0] & FATTR4_WORD0_ACL) {
 308                 u32 nace;
 309                 struct nfs4_ace *ace;
 310
 311                 READ_BUF(4); len += 4;
 312                 nace = be32_to_cpup(p++);
 313
 314                 if (nace > NFS4_ACL_MAX)
 315                         return nfserr_fbig;
 316
 317                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
 318                 if (*acl == NULL)
 319                         return nfserr_jukebox;
 320
 321                 (*acl)->naces = nace;
 322                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 323                         READ_BUF(16); len += 16;
 324                         ace->type = be32_to_cpup(p++);
 325                         ace->flag = be32_to_cpup(p++);
 326                         ace->access_mask = be32_to_cpup(p++);
 327                         dummy32 = be32_to_cpup(p++);
 328                         READ_BUF(dummy32);
 329                         len += XDR_QUADLEN(dummy32) << 2;
 330                         READMEM(buf, dummy32);
 331                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 332                         status = nfs_ok;
 333                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 334                                 ;
 335                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 336                                 status = nfsd_map_name_to_gid(argp->rqstp,
 337                                                 buf, dummy32, &ace->who_gid);
 338                         else
 339                                 status = nfsd_map_name_to_uid(argp->rqstp,
 340                                                 buf, dummy32, &ace->who_uid);
 341                         if (status)
 342                                 return status;
 343                 }
 344         } else
 345                 *acl = NULL;
 346         if (bmval[1] & FATTR4_WORD1_MODE) {
 347                 READ_BUF(4);
 348                 len += 4;
 349                 iattr->ia_mode = be32_to_cpup(p++);
 350                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 351                 iattr->ia_valid |= ATTR_MODE;
 352         }
 353         if (bmval[1] & FATTR4_WORD1_OWNER) {
 354                 READ_BUF(4);
 355                 len += 4;
 356                 dummy32 = be32_to_cpup(p++);
 357                 READ_BUF(dummy32);
 358                 len += (XDR_QUADLEN(dummy32) << 2);
 359                 READMEM(buf, dummy32);
 360                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 361                         return status;
 362                 iattr->ia_valid |= ATTR_UID;
 363         }
 364         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 365                 READ_BUF(4);
 366                 len += 4;
 367                 dummy32 = be32_to_cpup(p++);
 368                 READ_BUF(dummy32);
 369                 len += (XDR_QUADLEN(dummy32) << 2);
 370                 READMEM(buf, dummy32);
 371                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 372                         return status;
 373                 iattr->ia_valid |= ATTR_GID;
 374         }
 375         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 376                 READ_BUF(4);
 377                 len += 4;
 378                 dummy32 = be32_to_cpup(p++);
 379                 switch (dummy32) {
 380                 case NFS4_SET_TO_CLIENT_TIME:
 381                         len += 12;
 382                         status = nfsd4_decode_time(argp, &iattr->ia_atime);
 383                         if (status)
 384                                 return status;
 385                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 386                         break;
 387                 case NFS4_SET_TO_SERVER_TIME:
 388                         iattr->ia_valid |= ATTR_ATIME;
 389                         break;
 390                 default:
 391                         goto xdr_error;
 392                 }
 393         }
 394         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 395                 READ_BUF(4);
 396                 len += 4;
 397                 dummy32 = be32_to_cpup(p++);
 398                 switch (dummy32) {
 399                 case NFS4_SET_TO_CLIENT_TIME:
 400                         len += 12;
 401                         status = nfsd4_decode_time(argp, &iattr->ia_mtime);
 402                         if (status)
 403                                 return status;
 404                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 405                         break;
 406                 case NFS4_SET_TO_SERVER_TIME:
 407                         iattr->ia_valid |= ATTR_MTIME;
 408                         break;
 409                 default:
 410                         goto xdr_error;
 411                 }
 412         }
 413
 414         label->len = 0;
 415 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 416         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 417                 READ_BUF(4);
 418                 len += 4;
 419                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 420                 READ_BUF(4);
 421                 len += 4;
 422                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 423                 READ_BUF(4);
 424                 len += 4;
 425                 dummy32 = be32_to_cpup(p++);
 426                 READ_BUF(dummy32);
 427                 if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
 428                         return nfserr_badlabel;
 429                 len += (XDR_QUADLEN(dummy32) << 2);
 430                 READMEM(buf, dummy32);
 431                 label->len = dummy32;
 432                 label->data = svcxdr_dupstr(argp, buf, dummy32);
 433                 if (!label->data)
 434                         return nfserr_jukebox;
 435         }
 436 #endif
 437
 438         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 439             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 440             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 441                 READ_BUF(expected_len - len);
 442         else if (len != expected_len)
 443                 goto xdr_error;
 444
 445         DECODE_TAIL;
 446 }
 447
 448 static __be32
 449 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 450 {
 451         DECODE_HEAD;
 452
 453         READ_BUF(sizeof(stateid_t));
 454         sid->si_generation = be32_to_cpup(p++);
 455         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 456
 457         DECODE_TAIL;
 458 }
 459
 460 static __be32
 461 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 462 {
 463         DECODE_HEAD;
 464
 465         READ_BUF(4);
 466         access->ac_req_access = be32_to_cpup(p++);
 467
 468         DECODE_TAIL;
 469 }
 470
 471 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 472 {
 473         DECODE_HEAD;
 474         u32 dummy, uid, gid;
 475         char *machine_name;
 476         int i;
 477         int nr_secflavs;
 478
 479         /* callback_sec_params4 */
 480         READ_BUF(4);
 481         nr_secflavs = be32_to_cpup(p++);
 482         if (nr_secflavs)
 483                 cbs->flavor = (u32)(-1);
 484         else
 485                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 486                 cbs->flavor = 0;
 487         for (i = 0; i < nr_secflavs; ++i) {
 488                 READ_BUF(4);
 489                 dummy = be32_to_cpup(p++);
 490                 switch (dummy) {
 491                 case RPC_AUTH_NULL:
 492                         /* Nothing to read */
 493                         if (cbs->flavor == (u32)(-1))
 494                                 cbs->flavor = RPC_AUTH_NULL;
 495                         break;
 496                 case RPC_AUTH_UNIX:
 497                         READ_BUF(8);
 498                         /* stamp */
 499                         dummy = be32_to_cpup(p++);
 500
 501                         /* machine name */
 502                         dummy = be32_to_cpup(p++);
 503                         READ_BUF(dummy);
 504                         SAVEMEM(machine_name, dummy);
 505
 506                         /* uid, gid */
 507                         READ_BUF(8);
 508                         uid = be32_to_cpup(p++);
 509                         gid = be32_to_cpup(p++);
 510
 511                         /* more gids */
 512                         READ_BUF(4);
 513                         dummy = be32_to_cpup(p++);
 514                         READ_BUF(dummy * 4);
 515                         if (cbs->flavor == (u32)(-1)) {
 516                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 517                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 518                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 519                                         cbs->uid = kuid;
 520                                         cbs->gid = kgid;
 521                                         cbs->flavor = RPC_AUTH_UNIX;
 522                                 } else {
 523                                         dprintk("RPC_AUTH_UNIX with invalid"
 524                                                 "uid or gid ignoring!\n");
 525                                 }
 526                         }
 527                         break;
 528                 case RPC_AUTH_GSS:
 529                         dprintk("RPC_AUTH_GSS callback secflavor "
 530                                 "not supported!\n");
 531                         READ_BUF(8);
 532                         /* gcbp_service */
 533                         dummy = be32_to_cpup(p++);
 534                         /* gcbp_handle_from_server */
 535                         dummy = be32_to_cpup(p++);
 536                         READ_BUF(dummy);
 537                         p += XDR_QUADLEN(dummy);
 538                         /* gcbp_handle_from_client */
 539                         READ_BUF(4);
 540                         dummy = be32_to_cpup(p++);
 541                         READ_BUF(dummy);
 542                         break;
 543                 default:
 544                         dprintk("Illegal callback secflavor\n");
 545                         return nfserr_inval;
 546                 }
 547         }
 548         DECODE_TAIL;
 549 }
 550
 551 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 552 {
 553         DECODE_HEAD;
 554
 555         READ_BUF(4);
 556         bc->bc_cb_program = be32_to_cpup(p++);
 557         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 558
 559         DECODE_TAIL;
 560 }
 561
 562 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 563 {
 564         DECODE_HEAD;
 565
 566         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 567         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 568         bcts->dir = be32_to_cpup(p++);
 569         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 570          * could help us figure out we should be using it. */
 571         DECODE_TAIL;
 572 }
 573
 574 static __be32
 575 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 576 {
 577         DECODE_HEAD;
 578
 579         READ_BUF(4);
 580         close->cl_seqid = be32_to_cpup(p++);
 581         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 582
 583         DECODE_TAIL;
 584 }
 585
 586
 587 static __be32
 588 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 589 {
 590         DECODE_HEAD;
 591
 592         READ_BUF(12);
 593         p = xdr_decode_hyper(p, &commit->co_offset);
 594         commit->co_count = be32_to_cpup(p++);
 595
 596         DECODE_TAIL;
 597 }
 598
 599 static __be32
 600 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 601 {
 602         DECODE_HEAD;
 603
 604         READ_BUF(4);
 605         create->cr_type = be32_to_cpup(p++);
 606         switch (create->cr_type) {
 607         case NF4LNK:
 608                 READ_BUF(4);
 609                 create->cr_datalen = be32_to_cpup(p++);
 610                 READ_BUF(create->cr_datalen);
 611                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 612                 if (!create->cr_data)
 613                         return nfserr_jukebox;
 614                 break;
 615         case NF4BLK:
 616         case NF4CHR:
 617                 READ_BUF(8);
 618                 create->cr_specdata1 = be32_to_cpup(p++);
 619                 create->cr_specdata2 = be32_to_cpup(p++);
 620                 break;
 621         case NF4SOCK:
 622         case NF4FIFO:
 623         case NF4DIR:
 624         default:
 625                 break;
 626         }
 627
 628         READ_BUF(4);
 629         create->cr_namelen = be32_to_cpup(p++);
 630         READ_BUF(create->cr_namelen);
 631         SAVEMEM(create->cr_name, create->cr_namelen);
 632         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 633                 return status;
 634
 635         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 636                                     &create->cr_acl, &create->cr_label);
 637         if (status)
 638                 goto out;
 639
 640         DECODE_TAIL;
 641 }
 642
 643 static inline __be32
 644 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 645 {
 646         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 647 }
 648
 649 static inline __be32
 650 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 651 {
 652         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 653 }
 654
 655 static __be32
 656 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 657 {
 658         DECODE_HEAD;
 659
 660         READ_BUF(4);
 661         link->li_namelen = be32_to_cpup(p++);
 662         READ_BUF(link->li_namelen);
 663         SAVEMEM(link->li_name, link->li_namelen);
 664         if ((status = check_filename(link->li_name, link->li_namelen)))
 665                 return status;
 666
 667         DECODE_TAIL;
 668 }
 669
 670 static __be32
 671 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 672 {
 673         DECODE_HEAD;
 674
 675         /*
 676         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 677         */
 678         READ_BUF(28);
 679         lock->lk_type = be32_to_cpup(p++);
 680         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 681                 goto xdr_error;
 682         lock->lk_reclaim = be32_to_cpup(p++);
 683         p = xdr_decode_hyper(p, &lock->lk_offset);
 684         p = xdr_decode_hyper(p, &lock->lk_length);
 685         lock->lk_is_new = be32_to_cpup(p++);
 686
 687         if (lock->lk_is_new) {
 688                 READ_BUF(4);
 689                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 690                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 691                 if (status)
 692                         return status;
 693                 READ_BUF(8 + sizeof(clientid_t));
 694                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 695                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 696                 lock->lk_new_owner.len = be32_to_cpup(p++);
 697                 READ_BUF(lock->lk_new_owner.len);
 698                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 699         } else {
 700                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 701                 if (status)
 702                         return status;
 703                 READ_BUF(4);
 704                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 705         }
 706
 707         DECODE_TAIL;
 708 }
 709
 710 static __be32
 711 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 712 {
 713         DECODE_HEAD;
 714
 715         READ_BUF(32);
 716         lockt->lt_type = be32_to_cpup(p++);
 717         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 718                 goto xdr_error;
 719         p = xdr_decode_hyper(p, &lockt->lt_offset);
 720         p = xdr_decode_hyper(p, &lockt->lt_length);
 721         COPYMEM(&lockt->lt_clientid, 8);
 722         lockt->lt_owner.len = be32_to_cpup(p++);
 723         READ_BUF(lockt->lt_owner.len);
 724         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 725
 726         DECODE_TAIL;
 727 }
 728
 729 static __be32
 730 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 731 {
 732         DECODE_HEAD;
 733
 734         READ_BUF(8);
 735         locku->lu_type = be32_to_cpup(p++);
 736         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 737                 goto xdr_error;
 738         locku->lu_seqid = be32_to_cpup(p++);
 739         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 740         if (status)
 741                 return status;
 742         READ_BUF(16);
 743         p = xdr_decode_hyper(p, &locku->lu_offset);
 744         p = xdr_decode_hyper(p, &locku->lu_length);
 745
 746         DECODE_TAIL;
 747 }
 748
 749 static __be32
 750 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 751 {
 752         DECODE_HEAD;
 753
 754         READ_BUF(4);
 755         lookup->lo_len = be32_to_cpup(p++);
 756         READ_BUF(lookup->lo_len);
 757         SAVEMEM(lookup->lo_name, lookup->lo_len);
 758         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 759                 return status;
 760
 761         DECODE_TAIL;
 762 }
 763
 764 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 765 {
 766         __be32 *p;
 767         u32 w;
 768
 769         READ_BUF(4);
 770         w = be32_to_cpup(p++);
 771         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 772         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 773         if (deleg_when)
 774                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 775
 776         switch (w & NFS4_SHARE_ACCESS_MASK) {
 777         case NFS4_SHARE_ACCESS_READ:
 778         case NFS4_SHARE_ACCESS_WRITE:
 779         case NFS4_SHARE_ACCESS_BOTH:
 780                 break;
 781         default:
 782                 return nfserr_bad_xdr;
 783         }
 784         w &= ~NFS4_SHARE_ACCESS_MASK;
 785         if (!w)
 786                 return nfs_ok;
 787         if (!argp->minorversion)
 788                 return nfserr_bad_xdr;
 789         switch (w & NFS4_SHARE_WANT_MASK) {
 790         case NFS4_SHARE_WANT_NO_PREFERENCE:
 791         case NFS4_SHARE_WANT_READ_DELEG:
 792         case NFS4_SHARE_WANT_WRITE_DELEG:
 793         case NFS4_SHARE_WANT_ANY_DELEG:
 794         case NFS4_SHARE_WANT_NO_DELEG:
 795         case NFS4_SHARE_WANT_CANCEL:
 796                 break;
 797         default:
 798                 return nfserr_bad_xdr;
 799         }
 800         w &= ~NFS4_SHARE_WANT_MASK;
 801         if (!w)
 802                 return nfs_ok;
 803
 804         if (!deleg_when)        /* open_downgrade */
 805                 return nfserr_inval;
 806         switch (w) {
 807         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 808         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 809         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 810               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 811                 return nfs_ok;
 812         }
 813 xdr_error:
 814         return nfserr_bad_xdr;
 815 }
 816
 817 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 818 {
 819         __be32 *p;
 820
 821         READ_BUF(4);
 822         *x = be32_to_cpup(p++);
 823         /* Note: unlinke access bits, deny bits may be zero. */
 824         if (*x & ~NFS4_SHARE_DENY_BOTH)
 825                 return nfserr_bad_xdr;
 826         return nfs_ok;
 827 xdr_error:
 828         return nfserr_bad_xdr;
 829 }
 830
 831 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 832 {
 833         __be32 *p;
 834
 835         READ_BUF(4);
 836         o->len = be32_to_cpup(p++);
 837
 838         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 839                 return nfserr_bad_xdr;
 840
 841         READ_BUF(o->len);
 842         SAVEMEM(o->data, o->len);
 843         return nfs_ok;
 844 xdr_error:
 845         return nfserr_bad_xdr;
 846 }
 847
 848 static __be32
 849 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 850 {
 851         DECODE_HEAD;
 852         u32 dummy;
 853
 854         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 855         open->op_iattr.ia_valid = 0;
 856         open->op_openowner = NULL;
 857
 858         open->op_xdr_error = 0;
 859         /* seqid, share_access, share_deny, clientid, ownerlen */
 860         READ_BUF(4);
 861         open->op_seqid = be32_to_cpup(p++);
 862         /* decode, yet ignore deleg_when until supported */
 863         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 864                                            &open->op_deleg_want, &dummy);
 865         if (status)
 866                 goto xdr_error;
 867         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 868         if (status)
 869                 goto xdr_error;
 870         READ_BUF(sizeof(clientid_t));
 871         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 872         status = nfsd4_decode_opaque(argp, &open->op_owner);
 873         if (status)
 874                 goto xdr_error;
 875         READ_BUF(4);
 876         open->op_create = be32_to_cpup(p++);
 877         switch (open->op_create) {
 878         case NFS4_OPEN_NOCREATE:
 879                 break;
 880         case NFS4_OPEN_CREATE:
 881                 READ_BUF(4);
 882                 open->op_createmode = be32_to_cpup(p++);
 883                 switch (open->op_createmode) {
 884                 case NFS4_CREATE_UNCHECKED:
 885                 case NFS4_CREATE_GUARDED:
 886                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 887                                 &open->op_iattr, &open->op_acl, &open->op_label);
 888                         if (status)
 889                                 goto out;
 890                         break;
 891                 case NFS4_CREATE_EXCLUSIVE:
 892                         READ_BUF(NFS4_VERIFIER_SIZE);
 893                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 894                         break;
 895                 case NFS4_CREATE_EXCLUSIVE4_1:
 896                         if (argp->minorversion < 1)
 897                                 goto xdr_error;
 898                         READ_BUF(NFS4_VERIFIER_SIZE);
 899                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 900                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 901                                 &open->op_iattr, &open->op_acl, &open->op_label);
 902                         if (status)
 903                                 goto out;
 904                         break;
 905                 default:
 906                         goto xdr_error;
 907                 }
 908                 break;
 909         default:
 910                 goto xdr_error;
 911         }
 912
 913         /* open_claim */
 914         READ_BUF(4);
 915         open->op_claim_type = be32_to_cpup(p++);
 916         switch (open->op_claim_type) {
 917         case NFS4_OPEN_CLAIM_NULL:
 918         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 919                 READ_BUF(4);
 920                 open->op_fname.len = be32_to_cpup(p++);
 921                 READ_BUF(open->op_fname.len);
 922                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 923                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 924                         return status;
 925                 break;
 926         case NFS4_OPEN_CLAIM_PREVIOUS:
 927                 READ_BUF(4);
 928                 open->op_delegate_type = be32_to_cpup(p++);
 929                 break;
 930         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 931                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 932                 if (status)
 933                         return status;
 934                 READ_BUF(4);
 935                 open->op_fname.len = be32_to_cpup(p++);
 936                 READ_BUF(open->op_fname.len);
 937                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 938                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 939                         return status;
 940                 break;
 941         case NFS4_OPEN_CLAIM_FH:
 942         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 943                 if (argp->minorversion < 1)
 944                         goto xdr_error;
 945                 /* void */
 946                 break;
 947         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 948                 if (argp->minorversion < 1)
 949                         goto xdr_error;
 950                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 951                 if (status)
 952                         return status;
 953                 break;
 954         default:
 955                 goto xdr_error;
 956         }
 957
 958         DECODE_TAIL;
 959 }
 960
 961 static __be32
 962 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 963 {
 964         DECODE_HEAD;
 965
 966         if (argp->minorversion >= 1)
 967                 return nfserr_notsupp;
 968
 969         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 970         if (status)
 971                 return status;
 972         READ_BUF(4);
 973         open_conf->oc_seqid = be32_to_cpup(p++);
 974
 975         DECODE_TAIL;
 976 }
 977
 978 static __be32
 979 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 980 {
 981         DECODE_HEAD;
 982
 983         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 984         if (status)
 985                 return status;
 986         READ_BUF(4);
 987         open_down->od_seqid = be32_to_cpup(p++);
 988         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 989                                            &open_down->od_deleg_want, NULL);
 990         if (status)
 991                 return status;
 992         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 993         if (status)
 994                 return status;
 995         DECODE_TAIL;
 996 }
 997
 998 static __be32
 999 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1000 {
1001         DECODE_HEAD;
1002
1003         READ_BUF(4);
1004         putfh->pf_fhlen = be32_to_cpup(p++);
1005         if (putfh->pf_fhlen > NFS4_FHSIZE)
1006                 goto xdr_error;
1007         READ_BUF(putfh->pf_fhlen);
1008         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1009
1010         DECODE_TAIL;
1011 }
1012
1013 static __be32
1014 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1015 {
1016         if (argp->minorversion == 0)
1017                 return nfs_ok;
1018         return nfserr_notsupp;
1019 }
1020
1021 static __be32
1022 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1023 {
1024         DECODE_HEAD;
1025
1026         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1027         if (status)
1028                 return status;
1029         READ_BUF(12);
1030         p = xdr_decode_hyper(p, &read->rd_offset);
1031         read->rd_length = be32_to_cpup(p++);
1032
1033         DECODE_TAIL;
1034 }
1035
1036 static __be32
1037 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1038 {
1039         DECODE_HEAD;
1040
1041         READ_BUF(24);
1042         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1043         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1044         readdir->rd_dircount = be32_to_cpup(p++);
1045         readdir->rd_maxcount = be32_to_cpup(p++);
1046         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1047                 goto out;
1048
1049         DECODE_TAIL;
1050 }
1051
1052 static __be32
1053 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1054 {
1055         DECODE_HEAD;
1056
1057         READ_BUF(4);
1058         remove->rm_namelen = be32_to_cpup(p++);
1059         READ_BUF(remove->rm_namelen);
1060         SAVEMEM(remove->rm_name, remove->rm_namelen);
1061         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1062                 return status;
1063
1064         DECODE_TAIL;
1065 }
1066
1067 static __be32
1068 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1069 {
1070         DECODE_HEAD;
1071
1072         READ_BUF(4);
1073         rename->rn_snamelen = be32_to_cpup(p++);
1074         READ_BUF(rename->rn_snamelen + 4);
1075         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1076         rename->rn_tnamelen = be32_to_cpup(p++);
1077         READ_BUF(rename->rn_tnamelen);
1078         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1079         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1080                 return status;
1081         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1082                 return status;
1083
1084         DECODE_TAIL;
1085 }
1086
1087 static __be32
1088 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1089 {
1090         DECODE_HEAD;
1091
1092         if (argp->minorversion >= 1)
1093                 return nfserr_notsupp;
1094
1095         READ_BUF(sizeof(clientid_t));
1096         COPYMEM(clientid, sizeof(clientid_t));
1097
1098         DECODE_TAIL;
1099 }
1100
1101 static __be32
1102 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1103                      struct nfsd4_secinfo *secinfo)
1104 {
1105         DECODE_HEAD;
1106
1107         READ_BUF(4);
1108         secinfo->si_namelen = be32_to_cpup(p++);
1109         READ_BUF(secinfo->si_namelen);
1110         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1111         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1112         if (status)
1113                 return status;
1114         DECODE_TAIL;
1115 }
1116
1117 static __be32
1118 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1119                      struct nfsd4_secinfo_no_name *sin)
1120 {
1121         DECODE_HEAD;
1122
1123         READ_BUF(4);
1124         sin->sin_style = be32_to_cpup(p++);
1125         DECODE_TAIL;
1126 }
1127
1128 static __be32
1129 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1130 {
1131         __be32 status;
1132
1133         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1134         if (status)
1135                 return status;
1136         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1137                                   &setattr->sa_acl, &setattr->sa_label);
1138 }
1139
1140 static __be32
1141 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1142 {
1143         DECODE_HEAD;
1144
1145         if (argp->minorversion >= 1)
1146                 return nfserr_notsupp;
1147
1148         READ_BUF(NFS4_VERIFIER_SIZE);
1149         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1150
1151         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1152         if (status)
1153                 return nfserr_bad_xdr;
1154         READ_BUF(8);
1155         setclientid->se_callback_prog = be32_to_cpup(p++);
1156         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1157
1158         READ_BUF(setclientid->se_callback_netid_len + 4);
1159         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1160         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1161
1162         READ_BUF(setclientid->se_callback_addr_len + 4);
1163         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1164         setclientid->se_callback_ident = be32_to_cpup(p++);
1165
1166         DECODE_TAIL;
1167 }
1168
1169 static __be32
1170 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1171 {
1172         DECODE_HEAD;
1173
1174         if (argp->minorversion >= 1)
1175                 return nfserr_notsupp;
1176
1177         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1178         COPYMEM(&scd_c->sc_clientid, 8);
1179         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1180
1181         DECODE_TAIL;
1182 }
1183
1184 /* Also used for NVERIFY */
1185 static __be32
1186 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1187 {
1188         DECODE_HEAD;
1189
1190         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1191                 goto out;
1192
1193         /* For convenience's sake, we compare raw xdr'd attributes in
1194          * nfsd4_proc_verify */
1195
1196         READ_BUF(4);
1197         verify->ve_attrlen = be32_to_cpup(p++);
1198         READ_BUF(verify->ve_attrlen);
1199         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1200
1201         DECODE_TAIL;
1202 }
1203
1204 static __be32
1205 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1206 {
1207         int avail;
1208         int len;
1209         DECODE_HEAD;
1210
1211         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1212         if (status)
1213                 return status;
1214         READ_BUF(16);
1215         p = xdr_decode_hyper(p, &write->wr_offset);
1216         write->wr_stable_how = be32_to_cpup(p++);
1217         if (write->wr_stable_how > 2)
1218                 goto xdr_error;
1219         write->wr_buflen = be32_to_cpup(p++);
1220
1221         /* Sorry .. no magic macros for this.. *
1222          * READ_BUF(write->wr_buflen);
1223          * SAVEMEM(write->wr_buf, write->wr_buflen);
1224          */
1225         avail = (char*)argp->end - (char*)argp->p;
1226         if (avail + argp->pagelen < write->wr_buflen) {
1227                 dprintk("NFSD: xdr error (%s:%d)\n",
1228                                 __FILE__, __LINE__);
1229                 goto xdr_error;
1230         }
1231         write->wr_head.iov_base = p;
1232         write->wr_head.iov_len = avail;
1233         write->wr_pagelist = argp->pagelist;
1234
1235         len = XDR_QUADLEN(write->wr_buflen) << 2;
1236         if (len >= avail) {
1237                 int pages;
1238
1239                 len -= avail;
1240
1241                 pages = len >> PAGE_SHIFT;
1242                 argp->pagelist += pages;
1243                 argp->pagelen -= pages * PAGE_SIZE;
1244                 len -= pages * PAGE_SIZE;
1245
1246                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1247                 argp->pagelist++;
1248                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1249         }
1250         argp->p += XDR_QUADLEN(len);
1251
1252         DECODE_TAIL;
1253 }
1254
1255 static __be32
1256 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1257 {
1258         DECODE_HEAD;
1259
1260         if (argp->minorversion >= 1)
1261                 return nfserr_notsupp;
1262
1263         READ_BUF(12);
1264         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1265         rlockowner->rl_owner.len = be32_to_cpup(p++);
1266         READ_BUF(rlockowner->rl_owner.len);
1267         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1268
1269         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1270                 return nfserr_inval;
1271         DECODE_TAIL;
1272 }
1273
1274 static __be32
1275 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1276                          struct nfsd4_exchange_id *exid)
1277 {
1278         int dummy, tmp;
1279         DECODE_HEAD;
1280
1281         READ_BUF(NFS4_VERIFIER_SIZE);
1282         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1283
1284         status = nfsd4_decode_opaque(argp, &exid->clname);
1285         if (status)
1286                 return nfserr_bad_xdr;
1287
1288         READ_BUF(4);
1289         exid->flags = be32_to_cpup(p++);
1290
1291         /* Ignore state_protect4_a */
1292         READ_BUF(4);
1293         exid->spa_how = be32_to_cpup(p++);
1294         switch (exid->spa_how) {
1295         case SP4_NONE:
1296                 break;
1297         case SP4_MACH_CRED:
1298                 /* spo_must_enforce */
1299                 READ_BUF(4);
1300                 dummy = be32_to_cpup(p++);
1301                 READ_BUF(dummy * 4);
1302                 p += dummy;
1303
1304                 /* spo_must_allow */
1305                 READ_BUF(4);
1306                 dummy = be32_to_cpup(p++);
1307                 READ_BUF(dummy * 4);
1308                 p += dummy;
1309                 break;
1310         case SP4_SSV:
1311                 /* ssp_ops */
1312                 READ_BUF(4);
1313                 dummy = be32_to_cpup(p++);
1314                 READ_BUF(dummy * 4);
1315                 p += dummy;
1316
1317                 READ_BUF(4);
1318                 dummy = be32_to_cpup(p++);
1319                 READ_BUF(dummy * 4);
1320                 p += dummy;
1321
1322                 /* ssp_hash_algs<> */
1323                 READ_BUF(4);
1324                 tmp = be32_to_cpup(p++);
1325                 while (tmp--) {
1326                         READ_BUF(4);
1327                         dummy = be32_to_cpup(p++);
1328                         READ_BUF(dummy);
1329                         p += XDR_QUADLEN(dummy);
1330                 }
1331
1332                 /* ssp_encr_algs<> */
1333                 READ_BUF(4);
1334                 tmp = be32_to_cpup(p++);
1335                 while (tmp--) {
1336                         READ_BUF(4);
1337                         dummy = be32_to_cpup(p++);
1338                         READ_BUF(dummy);
1339                         p += XDR_QUADLEN(dummy);
1340                 }
1341
1342                 /* ssp_window and ssp_num_gss_handles */
1343                 READ_BUF(8);
1344                 dummy = be32_to_cpup(p++);
1345                 dummy = be32_to_cpup(p++);
1346                 break;
1347         default:
1348                 goto xdr_error;
1349         }
1350
1351         /* Ignore Implementation ID */
1352         READ_BUF(4);    /* nfs_impl_id4 array length */
1353         dummy = be32_to_cpup(p++);
1354
1355         if (dummy > 1)
1356                 goto xdr_error;
1357
1358         if (dummy == 1) {
1359                 /* nii_domain */
1360                 READ_BUF(4);
1361                 dummy = be32_to_cpup(p++);
1362                 READ_BUF(dummy);
1363                 p += XDR_QUADLEN(dummy);
1364
1365                 /* nii_name */
1366                 READ_BUF(4);
1367                 dummy = be32_to_cpup(p++);
1368                 READ_BUF(dummy);
1369                 p += XDR_QUADLEN(dummy);
1370
1371                 /* nii_date */
1372                 READ_BUF(12);
1373                 p += 3;
1374         }
1375         DECODE_TAIL;
1376 }
1377
1378 static __be32
1379 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1380                             struct nfsd4_create_session *sess)
1381 {
1382         DECODE_HEAD;
1383         u32 dummy;
1384
1385         READ_BUF(16);
1386         COPYMEM(&sess->clientid, 8);
1387         sess->seqid = be32_to_cpup(p++);
1388         sess->flags = be32_to_cpup(p++);
1389
1390         /* Fore channel attrs */
1391         READ_BUF(28);
1392         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1393         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1394         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1395         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1396         sess->fore_channel.maxops = be32_to_cpup(p++);
1397         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1398         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1399         if (sess->fore_channel.nr_rdma_attrs == 1) {
1400                 READ_BUF(4);
1401                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1402         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1403                 dprintk("Too many fore channel attr bitmaps!\n");
1404                 goto xdr_error;
1405         }
1406
1407         /* Back channel attrs */
1408         READ_BUF(28);
1409         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1410         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1411         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1412         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1413         sess->back_channel.maxops = be32_to_cpup(p++);
1414         sess->back_channel.maxreqs = be32_to_cpup(p++);
1415         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1416         if (sess->back_channel.nr_rdma_attrs == 1) {
1417                 READ_BUF(4);
1418                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1419         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1420                 dprintk("Too many back channel attr bitmaps!\n");
1421                 goto xdr_error;
1422         }
1423
1424         READ_BUF(4);
1425         sess->callback_prog = be32_to_cpup(p++);
1426         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1427         DECODE_TAIL;
1428 }
1429
1430 static __be32
1431 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1432                              struct nfsd4_destroy_session *destroy_session)
1433 {
1434         DECODE_HEAD;
1435         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1436         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1437
1438         DECODE_TAIL;
1439 }
1440
1441 static __be32
1442 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1443                           struct nfsd4_free_stateid *free_stateid)
1444 {
1445         DECODE_HEAD;
1446
1447         READ_BUF(sizeof(stateid_t));
1448         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1449         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1450
1451         DECODE_TAIL;
1452 }
1453
1454 static __be32
1455 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1456                       struct nfsd4_sequence *seq)
1457 {
1458         DECODE_HEAD;
1459
1460         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1461         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1462         seq->seqid = be32_to_cpup(p++);
1463         seq->slotid = be32_to_cpup(p++);
1464         seq->maxslots = be32_to_cpup(p++);
1465         seq->cachethis = be32_to_cpup(p++);
1466
1467         DECODE_TAIL;
1468 }
1469
1470 static __be32
1471 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1472 {
1473         int i;
1474         __be32 *p, status;
1475         struct nfsd4_test_stateid_id *stateid;
1476
1477         READ_BUF(4);
1478         test_stateid->ts_num_ids = ntohl(*p++);
1479
1480         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1481
1482         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1483                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1484                 if (!stateid) {
1485                         status = nfserrno(-ENOMEM);
1486                         goto out;
1487                 }
1488
1489                 INIT_LIST_HEAD(&stateid->ts_id_list);
1490                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1491
1492                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1493                 if (status)
1494                         goto out;
1495         }
1496
1497         status = 0;
1498 out:
1499         return status;
1500 xdr_error:
1501         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1502         status = nfserr_bad_xdr;
1503         goto out;
1504 }
1505
1506 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1507 {
1508         DECODE_HEAD;
1509
1510         READ_BUF(8);
1511         COPYMEM(&dc->clientid, 8);
1512
1513         DECODE_TAIL;
1514 }
1515
1516 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1517 {
1518         DECODE_HEAD;
1519
1520         READ_BUF(4);
1521         rc->rca_one_fs = be32_to_cpup(p++);
1522
1523         DECODE_TAIL;
1524 }
1525
1526 #ifdef CONFIG_NFSD_PNFS
1527 static __be32
1528 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1529                 struct nfsd4_getdeviceinfo *gdev)
1530 {
1531         DECODE_HEAD;
1532         u32 num, i;
1533
1534         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1535         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1536         gdev->gd_layout_type = be32_to_cpup(p++);
1537         gdev->gd_maxcount = be32_to_cpup(p++);
1538         num = be32_to_cpup(p++);
1539         if (num) {
1540                 READ_BUF(4 * num);
1541                 gdev->gd_notify_types = be32_to_cpup(p++);
1542                 for (i = 1; i < num; i++) {
1543                         if (be32_to_cpup(p++)) {
1544                                 status = nfserr_inval;
1545                                 goto out;
1546                         }
1547                 }
1548         }
1549         DECODE_TAIL;
1550 }
1551
1552 static __be32
1553 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1554                 struct nfsd4_layoutget *lgp)
1555 {
1556         DECODE_HEAD;
1557
1558         READ_BUF(36);
1559         lgp->lg_signal = be32_to_cpup(p++);
1560         lgp->lg_layout_type = be32_to_cpup(p++);
1561         lgp->lg_seg.iomode = be32_to_cpup(p++);
1562         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1563         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1564         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1565         nfsd4_decode_stateid(argp, &lgp->lg_sid);
1566         READ_BUF(4);
1567         lgp->lg_maxcount = be32_to_cpup(p++);
1568
1569         DECODE_TAIL;
1570 }
1571
1572 static __be32
1573 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1574                 struct nfsd4_layoutcommit *lcp)
1575 {
1576         DECODE_HEAD;
1577         u32 timechange;
1578
1579         READ_BUF(20);
1580         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1581         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1582         lcp->lc_reclaim = be32_to_cpup(p++);
1583         nfsd4_decode_stateid(argp, &lcp->lc_sid);
1584         READ_BUF(4);
1585         lcp->lc_newoffset = be32_to_cpup(p++);
1586         if (lcp->lc_newoffset) {
1587                 READ_BUF(8);
1588                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1589         } else
1590                 lcp->lc_last_wr = 0;
1591         READ_BUF(4);
1592         timechange = be32_to_cpup(p++);
1593         if (timechange) {
1594                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1595                 if (status)
1596                         return status;
1597         } else {
1598                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1599         }
1600         READ_BUF(8);
1601         lcp->lc_layout_type = be32_to_cpup(p++);
1602
1603         /*
1604          * Save the layout update in XDR format and let the layout driver deal
1605          * with it later.
1606          */
1607         lcp->lc_up_len = be32_to_cpup(p++);
1608         if (lcp->lc_up_len > 0) {
1609                 READ_BUF(lcp->lc_up_len);
1610                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1611         }
1612
1613         DECODE_TAIL;
1614 }
1615
1616 static __be32
1617 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1618                 struct nfsd4_layoutreturn *lrp)
1619 {
1620         DECODE_HEAD;
1621
1622         READ_BUF(16);
1623         lrp->lr_reclaim = be32_to_cpup(p++);
1624         lrp->lr_layout_type = be32_to_cpup(p++);
1625         lrp->lr_seg.iomode = be32_to_cpup(p++);
1626         lrp->lr_return_type = be32_to_cpup(p++);
1627         if (lrp->lr_return_type == RETURN_FILE) {
1628                 READ_BUF(16);
1629                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1630                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1631                 nfsd4_decode_stateid(argp, &lrp->lr_sid);
1632                 READ_BUF(4);
1633                 lrp->lrf_body_len = be32_to_cpup(p++);
1634                 if (lrp->lrf_body_len > 0) {
1635                         READ_BUF(lrp->lrf_body_len);
1636                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1637                 }
1638         } else {
1639                 lrp->lr_seg.offset = 0;
1640                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1641         }
1642
1643         DECODE_TAIL;
1644 }
1645 #endif /* CONFIG_NFSD_PNFS */
1646
1647 static __be32
1648 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1649                        struct nfsd4_fallocate *fallocate)
1650 {
1651         DECODE_HEAD;
1652
1653         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1654         if (status)
1655                 return status;
1656
1657         READ_BUF(16);
1658         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1659         xdr_decode_hyper(p, &fallocate->falloc_length);
1660
1661         DECODE_TAIL;
1662 }
1663
1664 static __be32
1665 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1666 {
1667         DECODE_HEAD;
1668
1669         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1670         if (status)
1671                 return status;
1672
1673         READ_BUF(8 + 4);
1674         p = xdr_decode_hyper(p, &seek->seek_offset);
1675         seek->seek_whence = be32_to_cpup(p);
1676
1677         DECODE_TAIL;
1678 }
1679
1680 static __be32
1681 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1682 {
1683         return nfs_ok;
1684 }
1685
1686 static __be32
1687 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1688 {
1689         return nfserr_notsupp;
1690 }
1691
1692 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1693
1694 static nfsd4_dec nfsd4_dec_ops[] = {
1695         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1696         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1697         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1698         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1699         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1700         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1701         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1702         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1703         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1704         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1705         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1706         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1707         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1708         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1709         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1710         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1711         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1712         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1713         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1714         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1715         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1716         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1717         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1718         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1719         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1720         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1721         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1722         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1723         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1724         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1725         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1726         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1727         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1728         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1729         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1730         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1731         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1732
1733         /* new operations for NFSv4.1 */
1734         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1735         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1736         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1737         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1738         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1739         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1740         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1741 #ifdef CONFIG_NFSD_PNFS
1742         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1743         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1744         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1745         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1746         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1747 #else
1748         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1749         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1750         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1751         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1752         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1753 #endif
1754         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1755         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1756         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1757         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1758         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1759         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1760         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1761
1762         /* new operations for NFSv4.2 */
1763         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1764         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_notsupp,
1765         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1766         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1767         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1768         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1769         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1770         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1771         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1772         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1773         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1774         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1775 };
1776
1777 static inline bool
1778 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1779 {
1780         if (op->opnum < FIRST_NFS4_OP)
1781                 return false;
1782         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1783                 return false;
1784         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1785                 return false;
1786         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1787                 return false;
1788         return true;
1789 }
1790
1791 static __be32
1792 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1793 {
1794         DECODE_HEAD;
1795         struct nfsd4_op *op;
1796         bool cachethis = false;
1797         int auth_slack= argp->rqstp->rq_auth_slack;
1798         int max_reply = auth_slack + 8; /* opcnt, status */
1799         int readcount = 0;
1800         int readbytes = 0;
1801         int i;
1802
1803         READ_BUF(4);
1804         argp->taglen = be32_to_cpup(p++);
1805         READ_BUF(argp->taglen + 8);
1806         SAVEMEM(argp->tag, argp->taglen);
1807         argp->minorversion = be32_to_cpup(p++);
1808         argp->opcnt = be32_to_cpup(p++);
1809         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1810
1811         if (argp->taglen > NFSD4_MAX_TAGLEN)
1812                 goto xdr_error;
1813         if (argp->opcnt > 100)
1814                 goto xdr_error;
1815
1816         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1817                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1818                 if (!argp->ops) {
1819                         argp->ops = argp->iops;
1820                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1821                         goto xdr_error;
1822                 }
1823         }
1824
1825         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1826                 argp->opcnt = 0;
1827
1828         for (i = 0; i < argp->opcnt; i++) {
1829                 op = &argp->ops[i];
1830                 op->replay = NULL;
1831
1832                 READ_BUF(4);
1833                 op->opnum = be32_to_cpup(p++);
1834
1835                 if (nfsd4_opnum_in_range(argp, op))
1836                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1837                 else {
1838                         op->opnum = OP_ILLEGAL;
1839                         op->status = nfserr_op_illegal;
1840                 }
1841                 /*
1842                  * We'll try to cache the result in the DRC if any one
1843                  * op in the compound wants to be cached:
1844                  */
1845                 cachethis |= nfsd4_cache_this_op(op);
1846
1847                 if (op->opnum == OP_READ) {
1848                         readcount++;
1849                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1850                 } else
1851                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1852                 /*
1853                  * OP_LOCK may return a conflicting lock.  (Special case
1854                  * because it will just skip encoding this if it runs
1855                  * out of xdr buffer space, and it is the only operation
1856                  * that behaves this way.)
1857                  */
1858                 if (op->opnum == OP_LOCK)
1859                         max_reply += NFS4_OPAQUE_LIMIT;
1860
1861                 if (op->status) {
1862                         argp->opcnt = i+1;
1863                         break;
1864                 }
1865         }
1866         /* Sessions make the DRC unnecessary: */
1867         if (argp->minorversion)
1868                 cachethis = false;
1869         svc_reserve(argp->rqstp, max_reply + readbytes);
1870         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1871
1872         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1873                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1874
1875         DECODE_TAIL;
1876 }
1877
1878 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1879 {
1880         if (IS_I_VERSION(inode)) {
1881                 p = xdr_encode_hyper(p, inode->i_version);
1882         } else {
1883                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1884                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1885         }
1886         return p;
1887 }
1888
1889 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1890 {
1891         *p++ = cpu_to_be32(c->atomic);
1892         if (c->change_supported) {
1893                 p = xdr_encode_hyper(p, c->before_change);
1894                 p = xdr_encode_hyper(p, c->after_change);
1895         } else {
1896                 *p++ = cpu_to_be32(c->before_ctime_sec);
1897                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1898                 *p++ = cpu_to_be32(c->after_ctime_sec);
1899                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1900         }
1901         return p;
1902 }
1903
1904 /* Encode as an array of strings the string given with components
1905  * separated @sep, escaped with esc_enter and esc_exit.
1906  */
1907 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1908                                           char *components, char esc_enter,
1909                                           char esc_exit)
1910 {
1911         __be32 *p;
1912         __be32 pathlen;
1913         int pathlen_offset;
1914         int strlen, count=0;
1915         char *str, *end, *next;
1916
1917         dprintk("nfsd4_encode_components(%s)\n", components);
1918
1919         pathlen_offset = xdr->buf->len;
1920         p = xdr_reserve_space(xdr, 4);
1921         if (!p)
1922                 return nfserr_resource;
1923         p++; /* We will fill this in with @count later */
1924
1925         end = str = components;
1926         while (*end) {
1927                 bool found_esc = false;
1928
1929                 /* try to parse as esc_start, ..., esc_end, sep */
1930                 if (*str == esc_enter) {
1931                         for (; *end && (*end != esc_exit); end++)
1932                                 /* find esc_exit or end of string */;
1933                         next = end + 1;
1934                         if (*end && (!*next || *next == sep)) {
1935                                 str++;
1936                                 found_esc = true;
1937                         }
1938                 }
1939
1940                 if (!found_esc)
1941                         for (; *end && (*end != sep); end++)
1942                                 /* find sep or end of string */;
1943
1944                 strlen = end - str;
1945                 if (strlen) {
1946                         p = xdr_reserve_space(xdr, strlen + 4);
1947                         if (!p)
1948                                 return nfserr_resource;
1949                         p = xdr_encode_opaque(p, str, strlen);
1950                         count++;
1951                 }
1952                 else
1953                         end++;
1954                 if (found_esc)
1955                         end = next;
1956
1957                 str = end;
1958         }
1959         pathlen = htonl(count);
1960         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1961         return 0;
1962 }
1963
1964 /* Encode as an array of strings the string given with components
1965  * separated @sep.
1966  */
1967 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1968                                       char *components)
1969 {
1970         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1971 }
1972
1973 /*
1974  * encode a location element of a fs_locations structure
1975  */
1976 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1977                                         struct nfsd4_fs_location *location)
1978 {
1979         __be32 status;
1980
1981         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1982                                                 '[', ']');
1983         if (status)
1984                 return status;
1985         status = nfsd4_encode_components(xdr, '/', location->path);
1986         if (status)
1987                 return status;
1988         return 0;
1989 }
1990
1991 /*
1992  * Encode a path in RFC3530 'pathname4' format
1993  */
1994 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
1995                                 const struct path *root,
1996                                 const struct path *path)
1997 {
1998         struct path cur = *path;
1999         __be32 *p;
2000         struct dentry **components = NULL;
2001         unsigned int ncomponents = 0;
2002         __be32 err = nfserr_jukebox;
2003
2004         dprintk("nfsd4_encode_components(");
2005
2006         path_get(&cur);
2007         /* First walk the path up to the nfsd root, and store the
2008          * dentries/path components in an array.
2009          */
2010         for (;;) {
2011                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
2012                         break;
2013                 if (cur.dentry == cur.mnt->mnt_root) {
2014                         if (follow_up(&cur))
2015                                 continue;
2016                         goto out_free;
2017                 }
2018                 if ((ncomponents & 15) == 0) {
2019                         struct dentry **new;
2020                         new = krealloc(components,
2021                                         sizeof(*new) * (ncomponents + 16),
2022                                         GFP_KERNEL);
2023                         if (!new)
2024                                 goto out_free;
2025                         components = new;
2026                 }
2027                 components[ncomponents++] = cur.dentry;
2028                 cur.dentry = dget_parent(cur.dentry);
2029         }
2030         err = nfserr_resource;
2031         p = xdr_reserve_space(xdr, 4);
2032         if (!p)
2033                 goto out_free;
2034         *p++ = cpu_to_be32(ncomponents);
2035
2036         while (ncomponents) {
2037                 struct dentry *dentry = components[ncomponents - 1];
2038                 unsigned int len;
2039
2040                 spin_lock(&dentry->d_lock);
2041                 len = dentry->d_name.len;
2042                 p = xdr_reserve_space(xdr, len + 4);
2043                 if (!p) {
2044                         spin_unlock(&dentry->d_lock);
2045                         goto out_free;
2046                 }
2047                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2048                 dprintk("/%pd", dentry);
2049                 spin_unlock(&dentry->d_lock);
2050                 dput(dentry);
2051                 ncomponents--;
2052         }
2053
2054         err = 0;
2055 out_free:
2056         dprintk(")\n");
2057         while (ncomponents)
2058                 dput(components[--ncomponents]);
2059         kfree(components);
2060         path_put(&cur);
2061         return err;
2062 }
2063
2064 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2065                         struct svc_rqst *rqstp, const struct path *path)
2066 {
2067         struct svc_export *exp_ps;
2068         __be32 res;
2069
2070         exp_ps = rqst_find_fsidzero_export(rqstp);
2071         if (IS_ERR(exp_ps))
2072                 return nfserrno(PTR_ERR(exp_ps));
2073         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2074         exp_put(exp_ps);
2075         return res;
2076 }
2077
2078 /*
2079  *  encode a fs_locations structure
2080  */
2081 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2082                         struct svc_rqst *rqstp, struct svc_export *exp)
2083 {
2084         __be32 status;
2085         int i;
2086         __be32 *p;
2087         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2088
2089         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2090         if (status)
2091                 return status;
2092         p = xdr_reserve_space(xdr, 4);
2093         if (!p)
2094                 return nfserr_resource;
2095         *p++ = cpu_to_be32(fslocs->locations_count);
2096         for (i=0; i<fslocs->locations_count; i++) {
2097                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2098                 if (status)
2099                         return status;
2100         }
2101         return 0;
2102 }
2103
2104 static u32 nfs4_file_type(umode_t mode)
2105 {
2106         switch (mode & S_IFMT) {
2107         case S_IFIFO:   return NF4FIFO;
2108         case S_IFCHR:   return NF4CHR;
2109         case S_IFDIR:   return NF4DIR;
2110         case S_IFBLK:   return NF4BLK;
2111         case S_IFLNK:   return NF4LNK;
2112         case S_IFREG:   return NF4REG;
2113         case S_IFSOCK:  return NF4SOCK;
2114         default:        return NF4BAD;
2115         };
2116 }
2117
2118 static inline __be32
2119 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2120                      struct nfs4_ace *ace)
2121 {
2122         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2123                 return nfs4_acl_write_who(xdr, ace->whotype);
2124         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2125                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2126         else
2127                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2128 }
2129
2130 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2131                               FATTR4_WORD0_RDATTR_ERROR)
2132 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2133
2134 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2135 static inline __be32
2136 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2137                             void *context, int len)
2138 {
2139         __be32 *p;
2140
2141         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2142         if (!p)
2143                 return nfserr_resource;
2144
2145         /*
2146          * For now we use a 0 here to indicate the null translation; in
2147          * the future we may place a call to translation code here.
2148          */
2149         *p++ = cpu_to_be32(0); /* lfs */
2150         *p++ = cpu_to_be32(0); /* pi */
2151         p = xdr_encode_opaque(p, context, len);
2152         return 0;
2153 }
2154 #else
2155 static inline __be32
2156 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2157                             void *context, int len)
2158 { return 0; }
2159 #endif
2160
2161 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2162 {
2163         /* As per referral draft:  */
2164         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2165             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2166                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2167                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2168                         *rdattr_err = NFSERR_MOVED;
2169                 else
2170                         return nfserr_moved;
2171         }
2172         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2173         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2174         return 0;
2175 }
2176
2177
2178 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2179 {
2180         struct path path = exp->ex_path;
2181         int err;
2182
2183         path_get(&path);
2184         while (follow_up(&path)) {
2185                 if (path.dentry != path.mnt->mnt_root)
2186                         break;
2187         }
2188         err = vfs_getattr(&path, stat);
2189         path_put(&path);
2190         return err;
2191 }
2192
2193 /*
2194  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2195  * ourselves.
2196  */
2197 static __be32
2198 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2199                 struct svc_export *exp,
2200                 struct dentry *dentry, u32 *bmval,
2201                 struct svc_rqst *rqstp, int ignore_crossmnt)
2202 {
2203         u32 bmval0 = bmval[0];
2204         u32 bmval1 = bmval[1];
2205         u32 bmval2 = bmval[2];
2206         struct kstat stat;
2207         struct svc_fh *tempfh = NULL;
2208         struct kstatfs statfs;
2209         __be32 *p;
2210         int starting_len = xdr->buf->len;
2211         int attrlen_offset;
2212         __be32 attrlen;
2213         u32 dummy;
2214         u64 dummy64;
2215         u32 rdattr_err = 0;
2216         __be32 status;
2217         int err;
2218         int aclsupport = 0;
2219         struct nfs4_acl *acl = NULL;
2220         void *context = NULL;
2221         int contextlen;
2222         bool contextsupport = false;
2223         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2224         u32 minorversion = resp->cstate.minorversion;
2225         struct path path = {
2226                 .mnt    = exp->ex_path.mnt,
2227                 .dentry = dentry,
2228         };
2229         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2230
2231         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2232         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2233         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2234         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2235
2236         if (exp->ex_fslocs.migrated) {
2237                 BUG_ON(bmval[2]);
2238                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2239                 if (status)
2240                         goto out;
2241         }
2242
2243         err = vfs_getattr(&path, &stat);
2244         if (err)
2245                 goto out_nfserr;
2246         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2247                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2248             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2249                        FATTR4_WORD1_SPACE_TOTAL))) {
2250                 err = vfs_statfs(&path, &statfs);
2251                 if (err)
2252                         goto out_nfserr;
2253         }
2254         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2255                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2256                 status = nfserr_jukebox;
2257                 if (!tempfh)
2258                         goto out;
2259                 fh_init(tempfh, NFS4_FHSIZE);
2260                 status = fh_compose(tempfh, exp, dentry, NULL);
2261                 if (status)
2262                         goto out;
2263                 fhp = tempfh;
2264         }
2265         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2266                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2267                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2268                 aclsupport = (err == 0);
2269                 if (bmval0 & FATTR4_WORD0_ACL) {
2270                         if (err == -EOPNOTSUPP)
2271                                 bmval0 &= ~FATTR4_WORD0_ACL;
2272                         else if (err == -EINVAL) {
2273                                 status = nfserr_attrnotsupp;
2274                                 goto out;
2275                         } else if (err != 0)
2276                                 goto out_nfserr;
2277                 }
2278         }
2279
2280 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2281         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2282                         bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2283                 err = security_inode_getsecctx(dentry->d_inode,
2284                                                 &context, &contextlen);
2285                 contextsupport = (err == 0);
2286                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2287                         if (err == -EOPNOTSUPP)
2288                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2289                         else if (err)
2290                                 goto out_nfserr;
2291                 }
2292         }
2293 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2294
2295         if (bmval2) {
2296                 p = xdr_reserve_space(xdr, 16);
2297                 if (!p)
2298                         goto out_resource;
2299                 *p++ = cpu_to_be32(3);
2300                 *p++ = cpu_to_be32(bmval0);
2301                 *p++ = cpu_to_be32(bmval1);
2302                 *p++ = cpu_to_be32(bmval2);
2303         } else if (bmval1) {
2304                 p = xdr_reserve_space(xdr, 12);
2305                 if (!p)
2306                         goto out_resource;
2307                 *p++ = cpu_to_be32(2);
2308                 *p++ = cpu_to_be32(bmval0);
2309                 *p++ = cpu_to_be32(bmval1);
2310         } else {
2311                 p = xdr_reserve_space(xdr, 8);
2312                 if (!p)
2313                         goto out_resource;
2314                 *p++ = cpu_to_be32(1);
2315                 *p++ = cpu_to_be32(bmval0);
2316         }
2317
2318         attrlen_offset = xdr->buf->len;
2319         p = xdr_reserve_space(xdr, 4);
2320         if (!p)
2321                 goto out_resource;
2322         p++;                /* to be backfilled later */
2323
2324         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2325                 u32 word0 = nfsd_suppattrs0(minorversion);
2326                 u32 word1 = nfsd_suppattrs1(minorversion);
2327                 u32 word2 = nfsd_suppattrs2(minorversion);
2328
2329                 if (!aclsupport)
2330                         word0 &= ~FATTR4_WORD0_ACL;
2331                 if (!contextsupport)
2332                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2333                 if (!word2) {
2334                         p = xdr_reserve_space(xdr, 12);
2335                         if (!p)
2336                                 goto out_resource;
2337                         *p++ = cpu_to_be32(2);
2338                         *p++ = cpu_to_be32(word0);
2339                         *p++ = cpu_to_be32(word1);
2340                 } else {
2341                         p = xdr_reserve_space(xdr, 16);
2342                         if (!p)
2343                                 goto out_resource;
2344                         *p++ = cpu_to_be32(3);
2345                         *p++ = cpu_to_be32(word0);
2346                         *p++ = cpu_to_be32(word1);
2347                         *p++ = cpu_to_be32(word2);
2348                 }
2349         }
2350         if (bmval0 & FATTR4_WORD0_TYPE) {
2351                 p = xdr_reserve_space(xdr, 4);
2352                 if (!p)
2353                         goto out_resource;
2354                 dummy = nfs4_file_type(stat.mode);
2355                 if (dummy == NF4BAD) {
2356                         status = nfserr_serverfault;
2357                         goto out;
2358                 }
2359                 *p++ = cpu_to_be32(dummy);
2360         }
2361         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2362                 p = xdr_reserve_space(xdr, 4);
2363                 if (!p)
2364                         goto out_resource;
2365                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2366                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2367                 else
2368                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2369                                                 NFS4_FH_VOL_RENAME);
2370         }
2371         if (bmval0 & FATTR4_WORD0_CHANGE) {
2372                 p = xdr_reserve_space(xdr, 8);
2373                 if (!p)
2374                         goto out_resource;
2375                 p = encode_change(p, &stat, dentry->d_inode);
2376         }
2377         if (bmval0 & FATTR4_WORD0_SIZE) {
2378                 p = xdr_reserve_space(xdr, 8);
2379                 if (!p)
2380                         goto out_resource;
2381                 p = xdr_encode_hyper(p, stat.size);
2382         }
2383         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2384                 p = xdr_reserve_space(xdr, 4);
2385                 if (!p)
2386                         goto out_resource;
2387                 *p++ = cpu_to_be32(1);
2388         }
2389         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2390                 p = xdr_reserve_space(xdr, 4);
2391                 if (!p)
2392                         goto out_resource;
2393                 *p++ = cpu_to_be32(1);
2394         }
2395         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2396                 p = xdr_reserve_space(xdr, 4);
2397                 if (!p)
2398                         goto out_resource;
2399                 *p++ = cpu_to_be32(0);
2400         }
2401         if (bmval0 & FATTR4_WORD0_FSID) {
2402                 p = xdr_reserve_space(xdr, 16);
2403                 if (!p)
2404                         goto out_resource;
2405                 if (exp->ex_fslocs.migrated) {
2406                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2407                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2408                 } else switch(fsid_source(fhp)) {
2409                 case FSIDSOURCE_FSID:
2410                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2411                         p = xdr_encode_hyper(p, (u64)0);
2412                         break;
2413                 case FSIDSOURCE_DEV:
2414                         *p++ = cpu_to_be32(0);
2415                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2416                         *p++ = cpu_to_be32(0);
2417                         *p++ = cpu_to_be32(MINOR(stat.dev));
2418                         break;
2419                 case FSIDSOURCE_UUID:
2420                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2421                                                                 EX_UUID_LEN);
2422                         break;
2423                 }
2424         }
2425         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2426                 p = xdr_reserve_space(xdr, 4);
2427                 if (!p)
2428                         goto out_resource;
2429                 *p++ = cpu_to_be32(0);
2430         }
2431         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2432                 p = xdr_reserve_space(xdr, 4);
2433                 if (!p)
2434                         goto out_resource;
2435                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2436         }
2437         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2438                 p = xdr_reserve_space(xdr, 4);
2439                 if (!p)
2440                         goto out_resource;
2441                 *p++ = cpu_to_be32(rdattr_err);
2442         }
2443         if (bmval0 & FATTR4_WORD0_ACL) {
2444                 struct nfs4_ace *ace;
2445
2446                 if (acl == NULL) {
2447                         p = xdr_reserve_space(xdr, 4);
2448                         if (!p)
2449                                 goto out_resource;
2450
2451                         *p++ = cpu_to_be32(0);
2452                         goto out_acl;
2453                 }
2454                 p = xdr_reserve_space(xdr, 4);
2455                 if (!p)
2456                         goto out_resource;
2457                 *p++ = cpu_to_be32(acl->naces);
2458
2459                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2460                         p = xdr_reserve_space(xdr, 4*3);
2461                         if (!p)
2462                                 goto out_resource;
2463                         *p++ = cpu_to_be32(ace->type);
2464                         *p++ = cpu_to_be32(ace->flag);
2465                         *p++ = cpu_to_be32(ace->access_mask &
2466                                                         NFS4_ACE_MASK_ALL);
2467                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2468                         if (status)
2469                                 goto out;
2470                 }
2471         }
2472 out_acl:
2473         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2474                 p = xdr_reserve_space(xdr, 4);
2475                 if (!p)
2476                         goto out_resource;
2477                 *p++ = cpu_to_be32(aclsupport ?
2478                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2479         }
2480         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2481                 p = xdr_reserve_space(xdr, 4);
2482                 if (!p)
2483                         goto out_resource;
2484                 *p++ = cpu_to_be32(1);
2485         }
2486         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2487                 p = xdr_reserve_space(xdr, 4);
2488                 if (!p)
2489                         goto out_resource;
2490                 *p++ = cpu_to_be32(0);
2491         }
2492         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2493                 p = xdr_reserve_space(xdr, 4);
2494                 if (!p)
2495                         goto out_resource;
2496                 *p++ = cpu_to_be32(1);
2497         }
2498         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2499                 p = xdr_reserve_space(xdr, 4);
2500                 if (!p)
2501                         goto out_resource;
2502                 *p++ = cpu_to_be32(1);
2503         }
2504         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2505                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2506                 if (!p)
2507                         goto out_resource;
2508                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2509                                         fhp->fh_handle.fh_size);
2510         }
2511         if (bmval0 & FATTR4_WORD0_FILEID) {
2512                 p = xdr_reserve_space(xdr, 8);
2513                 if (!p)
2514                         goto out_resource;
2515                 p = xdr_encode_hyper(p, stat.ino);
2516         }
2517         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2518                 p = xdr_reserve_space(xdr, 8);
2519                 if (!p)
2520                         goto out_resource;
2521                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2522         }
2523         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2524                 p = xdr_reserve_space(xdr, 8);
2525                 if (!p)
2526                         goto out_resource;
2527                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2528         }
2529         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2530                 p = xdr_reserve_space(xdr, 8);
2531                 if (!p)
2532                         goto out_resource;
2533                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2534         }
2535         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2536                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2537                 if (status)
2538                         goto out;
2539         }
2540         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2541                 p = xdr_reserve_space(xdr, 4);
2542                 if (!p)
2543                         goto out_resource;
2544                 *p++ = cpu_to_be32(1);
2545         }
2546         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2547                 p = xdr_reserve_space(xdr, 8);
2548                 if (!p)
2549                         goto out_resource;
2550                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2551         }
2552         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2553                 p = xdr_reserve_space(xdr, 4);
2554                 if (!p)
2555                         goto out_resource;
2556                 *p++ = cpu_to_be32(255);
2557         }
2558         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2559                 p = xdr_reserve_space(xdr, 4);
2560                 if (!p)
2561                         goto out_resource;
2562                 *p++ = cpu_to_be32(statfs.f_namelen);
2563         }
2564         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2565                 p = xdr_reserve_space(xdr, 8);
2566                 if (!p)
2567                         goto out_resource;
2568                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2569         }
2570         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2571                 p = xdr_reserve_space(xdr, 8);
2572                 if (!p)
2573                         goto out_resource;
2574                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2575         }
2576         if (bmval1 & FATTR4_WORD1_MODE) {
2577                 p = xdr_reserve_space(xdr, 4);
2578                 if (!p)
2579                         goto out_resource;
2580                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2581         }
2582         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2583                 p = xdr_reserve_space(xdr, 4);
2584                 if (!p)
2585                         goto out_resource;
2586                 *p++ = cpu_to_be32(1);
2587         }
2588         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2589                 p = xdr_reserve_space(xdr, 4);
2590                 if (!p)
2591                         goto out_resource;
2592                 *p++ = cpu_to_be32(stat.nlink);
2593         }
2594         if (bmval1 & FATTR4_WORD1_OWNER) {
2595                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2596                 if (status)
2597                         goto out;
2598         }
2599         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2600                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2601                 if (status)
2602                         goto out;
2603         }
2604         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2605                 p = xdr_reserve_space(xdr, 8);
2606                 if (!p)
2607                         goto out_resource;
2608                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2609                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2610         }
2611         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2612                 p = xdr_reserve_space(xdr, 8);
2613                 if (!p)
2614                         goto out_resource;
2615                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2616                 p = xdr_encode_hyper(p, dummy64);
2617         }
2618         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2619                 p = xdr_reserve_space(xdr, 8);
2620                 if (!p)
2621                         goto out_resource;
2622                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2623                 p = xdr_encode_hyper(p, dummy64);
2624         }
2625         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2626                 p = xdr_reserve_space(xdr, 8);
2627                 if (!p)
2628                         goto out_resource;
2629                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2630                 p = xdr_encode_hyper(p, dummy64);
2631         }
2632         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2633                 p = xdr_reserve_space(xdr, 8);
2634                 if (!p)
2635                         goto out_resource;
2636                 dummy64 = (u64)stat.blocks << 9;
2637                 p = xdr_encode_hyper(p, dummy64);
2638         }
2639         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2640                 p = xdr_reserve_space(xdr, 12);
2641                 if (!p)
2642                         goto out_resource;
2643                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2644                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2645         }
2646         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2647                 p = xdr_reserve_space(xdr, 12);
2648                 if (!p)
2649                         goto out_resource;
2650                 *p++ = cpu_to_be32(0);
2651                 *p++ = cpu_to_be32(1);
2652                 *p++ = cpu_to_be32(0);
2653         }
2654         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2655                 p = xdr_reserve_space(xdr, 12);
2656                 if (!p)
2657                         goto out_resource;
2658                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2659                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2660         }
2661         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2662                 p = xdr_reserve_space(xdr, 12);
2663                 if (!p)
2664                         goto out_resource;
2665                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2666                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2667         }
2668         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2669                 p = xdr_reserve_space(xdr, 8);
2670                 if (!p)
2671                         goto out_resource;
2672                 /*
2673                  * Get parent's attributes if not ignoring crossmount
2674                  * and this is the root of a cross-mounted filesystem.
2675                  */
2676                 if (ignore_crossmnt == 0 &&
2677                     dentry == exp->ex_path.mnt->mnt_root)
2678                         get_parent_attributes(exp, &stat);
2679                 p = xdr_encode_hyper(p, stat.ino);
2680         }
2681 #ifdef CONFIG_NFSD_PNFS
2682         if ((bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) ||
2683             (bmval2 & FATTR4_WORD2_LAYOUT_TYPES)) {
2684                 if (exp->ex_layout_type) {
2685                         p = xdr_reserve_space(xdr, 8);
2686                         if (!p)
2687                                 goto out_resource;
2688                         *p++ = cpu_to_be32(1);
2689                         *p++ = cpu_to_be32(exp->ex_layout_type);
2690                 } else {
2691                         p = xdr_reserve_space(xdr, 4);
2692                         if (!p)
2693                                 goto out_resource;
2694                         *p++ = cpu_to_be32(0);
2695                 }
2696         }
2697
2698         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2699                 p = xdr_reserve_space(xdr, 4);
2700                 if (!p)
2701                         goto out_resource;
2702                 *p++ = cpu_to_be32(stat.blksize);
2703         }
2704 #endif /* CONFIG_NFSD_PNFS */
2705         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2706                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2707                                                                 contextlen);
2708                 if (status)
2709                         goto out;
2710         }
2711         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2712                 p = xdr_reserve_space(xdr, 16);
2713                 if (!p)
2714                         goto out_resource;
2715                 *p++ = cpu_to_be32(3);
2716                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2717                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2718                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2719         }
2720
2721         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2722         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2723         status = nfs_ok;
2724
2725 out:
2726 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2727         if (context)
2728                 security_release_secctx(context, contextlen);
2729 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2730         kfree(acl);
2731         if (tempfh) {
2732                 fh_put(tempfh);
2733                 kfree(tempfh);
2734         }
2735         if (status)
2736                 xdr_truncate_encode(xdr, starting_len);
2737         return status;
2738 out_nfserr:
2739         status = nfserrno(err);
2740         goto out;
2741 out_resource:
2742         status = nfserr_resource;
2743         goto out;
2744 }
2745
2746 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2747                                 struct xdr_buf *buf, __be32 *p, int bytes)
2748 {
2749         xdr->scratch.iov_len = 0;
2750         memset(buf, 0, sizeof(struct xdr_buf));
2751         buf->head[0].iov_base = p;
2752         buf->head[0].iov_len = 0;
2753         buf->len = 0;
2754         xdr->buf = buf;
2755         xdr->iov = buf->head;
2756         xdr->p = p;
2757         xdr->end = (void *)p + bytes;
2758         buf->buflen = bytes;
2759 }
2760
2761 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2762                         struct svc_fh *fhp, struct svc_export *exp,
2763                         struct dentry *dentry, u32 *bmval,
2764                         struct svc_rqst *rqstp, int ignore_crossmnt)
2765 {
2766         struct xdr_buf dummy;
2767         struct xdr_stream xdr;
2768         __be32 ret;
2769
2770         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2771         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2772                                                         ignore_crossmnt);
2773         *p = xdr.p;
2774         return ret;
2775 }
2776
2777 static inline int attributes_need_mount(u32 *bmval)
2778 {
2779         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2780                 return 1;
2781         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2782                 return 1;
2783         return 0;
2784 }
2785
2786 static __be32
2787 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2788                         const char *name, int namlen)
2789 {
2790         struct svc_export *exp = cd->rd_fhp->fh_export;
2791         struct dentry *dentry;
2792         __be32 nfserr;
2793         int ignore_crossmnt = 0;
2794
2795         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2796         if (IS_ERR(dentry))
2797                 return nfserrno(PTR_ERR(dentry));
2798         if (!dentry->d_inode) {
2799                 /*
2800                  * nfsd_buffered_readdir drops the i_mutex between
2801                  * readdir and calling this callback, leaving a window
2802                  * where this directory entry could have gone away.
2803                  */
2804                 dput(dentry);
2805                 return nfserr_noent;
2806         }
2807
2808         exp_get(exp);
2809         /*
2810          * In the case of a mountpoint, the client may be asking for
2811          * attributes that are only properties of the underlying filesystem
2812          * as opposed to the cross-mounted file system. In such a case,
2813          * we will not follow the cross mount and will fill the attribtutes
2814          * directly from the mountpoint dentry.
2815          */
2816         if (nfsd_mountpoint(dentry, exp)) {
2817                 int err;
2818
2819                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2820                                 && !attributes_need_mount(cd->rd_bmval)) {
2821                         ignore_crossmnt = 1;
2822                         goto out_encode;
2823                 }
2824                 /*
2825                  * Why the heck aren't we just using nfsd_lookup??
2826                  * Different "."/".." handling?  Something else?
2827                  * At least, add a comment here to explain....
2828                  */
2829                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2830                 if (err) {
2831                         nfserr = nfserrno(err);
2832                         goto out_put;
2833                 }
2834                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2835                 if (nfserr)
2836                         goto out_put;
2837
2838         }
2839 out_encode:
2840         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2841                                         cd->rd_rqstp, ignore_crossmnt);
2842 out_put:
2843         dput(dentry);
2844         exp_put(exp);
2845         return nfserr;
2846 }
2847
2848 static __be32 *
2849 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2850 {
2851         __be32 *p;
2852
2853         p = xdr_reserve_space(xdr, 20);
2854         if (!p)
2855                 return NULL;
2856         *p++ = htonl(2);
2857         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2858         *p++ = htonl(0);                         /* bmval1 */
2859
2860         *p++ = htonl(4);     /* attribute length */
2861         *p++ = nfserr;       /* no htonl */
2862         return p;
2863 }
2864
2865 static int
2866 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2867                     loff_t offset, u64 ino, unsigned int d_type)
2868 {
2869         struct readdir_cd *ccd = ccdv;
2870         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2871         struct xdr_stream *xdr = cd->xdr;
2872         int start_offset = xdr->buf->len;
2873         int cookie_offset;
2874         u32 name_and_cookie;
2875         int entry_bytes;
2876         __be32 nfserr = nfserr_toosmall;
2877         __be64 wire_offset;
2878         __be32 *p;
2879
2880         /* In nfsv4, "." and ".." never make it onto the wire.. */
2881         if (name && isdotent(name, namlen)) {
2882                 cd->common.err = nfs_ok;
2883                 return 0;
2884         }
2885
2886         if (cd->cookie_offset) {
2887                 wire_offset = cpu_to_be64(offset);
2888                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2889                                                         &wire_offset, 8);
2890         }
2891
2892         p = xdr_reserve_space(xdr, 4);
2893         if (!p)
2894                 goto fail;
2895         *p++ = xdr_one;                             /* mark entry present */
2896         cookie_offset = xdr->buf->len;
2897         p = xdr_reserve_space(xdr, 3*4 + namlen);
2898         if (!p)
2899                 goto fail;
2900         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2901         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2902
2903         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2904         switch (nfserr) {
2905         case nfs_ok:
2906                 break;
2907         case nfserr_resource:
2908                 nfserr = nfserr_toosmall;
2909                 goto fail;
2910         case nfserr_noent:
2911                 xdr_truncate_encode(xdr, start_offset);
2912                 goto skip_entry;
2913         default:
2914                 /*
2915                  * If the client requested the RDATTR_ERROR attribute,
2916                  * we stuff the error code into this attribute
2917                  * and continue.  If this attribute was not requested,
2918                  * then in accordance with the spec, we fail the
2919                  * entire READDIR operation(!)
2920                  */
2921                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2922                         goto fail;
2923                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2924                 if (p == NULL) {
2925                         nfserr = nfserr_toosmall;
2926                         goto fail;
2927                 }
2928         }
2929         nfserr = nfserr_toosmall;
2930         entry_bytes = xdr->buf->len - start_offset;
2931         if (entry_bytes > cd->rd_maxcount)
2932                 goto fail;
2933         cd->rd_maxcount -= entry_bytes;
2934         /*
2935          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
2936          * let's always let through the first entry, at least:
2937          */
2938         if (!cd->rd_dircount)
2939                 goto fail;
2940         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
2941         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
2942                 goto fail;
2943         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
2944
2945         cd->cookie_offset = cookie_offset;
2946 skip_entry:
2947         cd->common.err = nfs_ok;
2948         return 0;
2949 fail:
2950         xdr_truncate_encode(xdr, start_offset);
2951         cd->common.err = nfserr;
2952         return -EINVAL;
2953 }
2954
2955 static __be32
2956 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2957 {
2958         __be32 *p;
2959
2960         p = xdr_reserve_space(xdr, sizeof(stateid_t));
2961         if (!p)
2962                 return nfserr_resource;
2963         *p++ = cpu_to_be32(sid->si_generation);
2964         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
2965                                         sizeof(stateid_opaque_t));
2966         return 0;
2967 }
2968
2969 static __be32
2970 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2971 {
2972         struct xdr_stream *xdr = &resp->xdr;
2973         __be32 *p;
2974
2975         if (!nfserr) {
2976                 p = xdr_reserve_space(xdr, 8);
2977                 if (!p)
2978                         return nfserr_resource;
2979                 *p++ = cpu_to_be32(access->ac_supported);
2980                 *p++ = cpu_to_be32(access->ac_resp_access);
2981         }
2982         return nfserr;
2983 }
2984
2985 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2986 {
2987         struct xdr_stream *xdr = &resp->xdr;
2988         __be32 *p;
2989
2990         if (!nfserr) {
2991                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
2992                 if (!p)
2993                         return nfserr_resource;
2994                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
2995                                                 NFS4_MAX_SESSIONID_LEN);
2996                 *p++ = cpu_to_be32(bcts->dir);
2997                 /* Sorry, we do not yet support RDMA over 4.1: */
2998                 *p++ = cpu_to_be32(0);
2999         }
3000         return nfserr;
3001 }
3002
3003 static __be32
3004 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3005 {
3006         struct xdr_stream *xdr = &resp->xdr;
3007
3008         if (!nfserr)
3009                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3010
3011         return nfserr;
3012 }
3013
3014
3015 static __be32
3016 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3017 {
3018         struct xdr_stream *xdr = &resp->xdr;
3019         __be32 *p;
3020
3021         if (!nfserr) {
3022                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3023                 if (!p)
3024                         return nfserr_resource;
3025                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3026                                                 NFS4_VERIFIER_SIZE);
3027         }
3028         return nfserr;
3029 }
3030
3031 static __be32
3032 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3033 {
3034         struct xdr_stream *xdr = &resp->xdr;
3035         __be32 *p;
3036
3037         if (!nfserr) {
3038                 p = xdr_reserve_space(xdr, 32);
3039                 if (!p)
3040                         return nfserr_resource;
3041                 p = encode_cinfo(p, &create->cr_cinfo);
3042                 *p++ = cpu_to_be32(2);
3043                 *p++ = cpu_to_be32(create->cr_bmval[0]);
3044                 *p++ = cpu_to_be32(create->cr_bmval[1]);
3045         }
3046         return nfserr;
3047 }
3048
3049 static __be32
3050 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3051 {
3052         struct svc_fh *fhp = getattr->ga_fhp;
3053         struct xdr_stream *xdr = &resp->xdr;
3054
3055         if (nfserr)
3056                 return nfserr;
3057
3058         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3059                                     getattr->ga_bmval,
3060                                     resp->rqstp, 0);
3061         return nfserr;
3062 }
3063
3064 static __be32
3065 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3066 {
3067         struct xdr_stream *xdr = &resp->xdr;
3068         struct svc_fh *fhp = *fhpp;
3069         unsigned int len;
3070         __be32 *p;
3071
3072         if (!nfserr) {
3073                 len = fhp->fh_handle.fh_size;
3074                 p = xdr_reserve_space(xdr, len + 4);
3075                 if (!p)
3076                         return nfserr_resource;
3077                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3078         }
3079         return nfserr;
3080 }
3081
3082 /*
3083 * Including all fields other than the name, a LOCK4denied structure requires
3084 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3085 */
3086 static __be32
3087 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3088 {
3089         struct xdr_netobj *conf = &ld->ld_owner;
3090         __be32 *p;
3091
3092 again:
3093         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3094         if (!p) {
3095                 /*
3096                  * Don't fail to return the result just because we can't
3097                  * return the conflicting open:
3098                  */
3099                 if (conf->len) {
3100                         kfree(conf->data);
3101                         conf->len = 0;
3102                         conf->data = NULL;
3103                         goto again;
3104                 }
3105                 return nfserr_resource;
3106         }
3107         p = xdr_encode_hyper(p, ld->ld_start);
3108         p = xdr_encode_hyper(p, ld->ld_length);
3109         *p++ = cpu_to_be32(ld->ld_type);
3110         if (conf->len) {
3111                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3112                 p = xdr_encode_opaque(p, conf->data, conf->len);
3113                 kfree(conf->data);
3114         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3115                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3116                 *p++ = cpu_to_be32(0); /* length of owner name */
3117         }
3118         return nfserr_denied;
3119 }
3120
3121 static __be32
3122 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3123 {
3124         struct xdr_stream *xdr = &resp->xdr;
3125
3126         if (!nfserr)
3127                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3128         else if (nfserr == nfserr_denied)
3129                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3130
3131         return nfserr;
3132 }
3133
3134 static __be32
3135 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3136 {
3137         struct xdr_stream *xdr = &resp->xdr;
3138
3139         if (nfserr == nfserr_denied)
3140                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3141         return nfserr;
3142 }
3143
3144 static __be32
3145 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3146 {
3147         struct xdr_stream *xdr = &resp->xdr;
3148
3149         if (!nfserr)
3150                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3151
3152         return nfserr;
3153 }
3154
3155
3156 static __be32
3157 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3158 {
3159         struct xdr_stream *xdr = &resp->xdr;
3160         __be32 *p;
3161
3162         if (!nfserr) {
3163                 p = xdr_reserve_space(xdr, 20);
3164                 if (!p)
3165                         return nfserr_resource;
3166                 p = encode_cinfo(p, &link->li_cinfo);
3167         }
3168         return nfserr;
3169 }
3170
3171
3172 static __be32
3173 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3174 {
3175         struct xdr_stream *xdr = &resp->xdr;
3176         __be32 *p;
3177
3178         if (nfserr)
3179                 goto out;
3180
3181         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3182         if (nfserr)
3183                 goto out;
3184         p = xdr_reserve_space(xdr, 40);
3185         if (!p)
3186                 return nfserr_resource;
3187         p = encode_cinfo(p, &open->op_cinfo);
3188         *p++ = cpu_to_be32(open->op_rflags);
3189         *p++ = cpu_to_be32(2);
3190         *p++ = cpu_to_be32(open->op_bmval[0]);
3191         *p++ = cpu_to_be32(open->op_bmval[1]);
3192         *p++ = cpu_to_be32(open->op_delegate_type);
3193
3194         switch (open->op_delegate_type) {
3195         case NFS4_OPEN_DELEGATE_NONE:
3196                 break;
3197         case NFS4_OPEN_DELEGATE_READ:
3198                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3199                 if (nfserr)
3200                         return nfserr;
3201                 p = xdr_reserve_space(xdr, 20);
3202                 if (!p)
3203                         return nfserr_resource;
3204                 *p++ = cpu_to_be32(open->op_recall);
3205
3206                 /*
3207                  * TODO: ACE's in delegations
3208                  */
3209                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3210                 *p++ = cpu_to_be32(0);
3211                 *p++ = cpu_to_be32(0);
3212                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3213                 break;
3214         case NFS4_OPEN_DELEGATE_WRITE:
3215                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3216                 if (nfserr)
3217                         return nfserr;
3218                 p = xdr_reserve_space(xdr, 32);
3219                 if (!p)
3220                         return nfserr_resource;
3221                 *p++ = cpu_to_be32(0);
3222
3223                 /*
3224                  * TODO: space_limit's in delegations
3225                  */
3226                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3227                 *p++ = cpu_to_be32(~(u32)0);
3228                 *p++ = cpu_to_be32(~(u32)0);
3229
3230                 /*
3231                  * TODO: ACE's in delegations
3232                  */
3233                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3234                 *p++ = cpu_to_be32(0);
3235                 *p++ = cpu_to_be32(0);
3236                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3237                 break;
3238         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3239                 switch (open->op_why_no_deleg) {
3240                 case WND4_CONTENTION:
3241                 case WND4_RESOURCE:
3242                         p = xdr_reserve_space(xdr, 8);
3243                         if (!p)
3244                                 return nfserr_resource;
3245                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3246                         /* deleg signaling not supported yet: */
3247                         *p++ = cpu_to_be32(0);
3248                         break;
3249                 default:
3250                         p = xdr_reserve_space(xdr, 4);
3251                         if (!p)
3252                                 return nfserr_resource;
3253                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3254                 }
3255                 break;
3256         default:
3257                 BUG();
3258         }
3259         /* XXX save filehandle here */
3260 out:
3261         return nfserr;
3262 }
3263
3264 static __be32
3265 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3266 {
3267         struct xdr_stream *xdr = &resp->xdr;
3268
3269         if (!nfserr)
3270                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3271
3272         return nfserr;
3273 }
3274
3275 static __be32
3276 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3277 {
3278         struct xdr_stream *xdr = &resp->xdr;
3279
3280         if (!nfserr)
3281                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3282
3283         return nfserr;
3284 }
3285
3286 static __be32 nfsd4_encode_splice_read(
3287                                 struct nfsd4_compoundres *resp,
3288                                 struct nfsd4_read *read,
3289                                 struct file *file, unsigned long maxcount)
3290 {
3291         struct xdr_stream *xdr = &resp->xdr;
3292         struct xdr_buf *buf = xdr->buf;
3293         u32 eof;
3294         int space_left;
3295         __be32 nfserr;
3296         __be32 *p = xdr->p - 2;
3297
3298         /* Make sure there will be room for padding if needed */
3299         if (xdr->end - xdr->p < 1)
3300                 return nfserr_resource;
3301
3302         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3303                                   read->rd_offset, &maxcount);
3304         if (nfserr) {
3305                 /*
3306                  * nfsd_splice_actor may have already messed with the
3307                  * page length; reset it so as not to confuse
3308                  * xdr_truncate_encode:
3309                  */
3310                 buf->page_len = 0;
3311                 return nfserr;
3312         }
3313
3314         eof = (read->rd_offset + maxcount >=
3315                read->rd_fhp->fh_dentry->d_inode->i_size);
3316
3317         *(p++) = htonl(eof);
3318         *(p++) = htonl(maxcount);
3319
3320         buf->page_len = maxcount;
3321         buf->len += maxcount;
3322         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3323                                                         / PAGE_SIZE;
3324
3325         /* Use rest of head for padding and remaining ops: */
3326         buf->tail[0].iov_base = xdr->p;
3327         buf->tail[0].iov_len = 0;
3328         xdr->iov = buf->tail;
3329         if (maxcount&3) {
3330                 int pad = 4 - (maxcount&3);
3331
3332                 *(xdr->p++) = 0;
3333
3334                 buf->tail[0].iov_base += maxcount&3;
3335                 buf->tail[0].iov_len = pad;
3336                 buf->len += pad;
3337         }
3338
3339         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3340                                 buf->buflen - buf->len);
3341         buf->buflen = buf->len + space_left;
3342         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3343
3344         return 0;
3345 }
3346
3347 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3348                                  struct nfsd4_read *read,
3349                                  struct file *file, unsigned long maxcount)
3350 {
3351         struct xdr_stream *xdr = &resp->xdr;
3352         u32 eof;
3353         int v;
3354         int starting_len = xdr->buf->len - 8;
3355         long len;
3356         int thislen;
3357         __be32 nfserr;
3358         __be32 tmp;
3359         __be32 *p;
3360         u32 zzz = 0;
3361         int pad;
3362
3363         len = maxcount;
3364         v = 0;
3365
3366         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3367         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3368         WARN_ON_ONCE(!p);
3369         resp->rqstp->rq_vec[v].iov_base = p;
3370         resp->rqstp->rq_vec[v].iov_len = thislen;
3371         v++;
3372         len -= thislen;
3373
3374         while (len) {
3375                 thislen = min_t(long, len, PAGE_SIZE);
3376                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3377                 WARN_ON_ONCE(!p);
3378                 resp->rqstp->rq_vec[v].iov_base = p;
3379                 resp->rqstp->rq_vec[v].iov_len = thislen;
3380                 v++;
3381                 len -= thislen;
3382         }
3383         read->rd_vlen = v;
3384
3385         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3386                         read->rd_vlen, &maxcount);
3387         if (nfserr)
3388                 return nfserr;
3389         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3390
3391         eof = (read->rd_offset + maxcount >=
3392                read->rd_fhp->fh_dentry->d_inode->i_size);
3393
3394         tmp = htonl(eof);
3395         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3396         tmp = htonl(maxcount);
3397         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3398
3399         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3400         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3401                                                                 &zzz, pad);
3402         return 0;
3403
3404 }
3405
3406 static __be32
3407 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3408                   struct nfsd4_read *read)
3409 {
3410         unsigned long maxcount;
3411         struct xdr_stream *xdr = &resp->xdr;
3412         struct file *file = read->rd_filp;
3413         int starting_len = xdr->buf->len;
3414         struct raparms *ra;
3415         __be32 *p;
3416         __be32 err;
3417
3418         if (nfserr)
3419                 return nfserr;
3420
3421         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3422         if (!p) {
3423                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3424                 return nfserr_resource;
3425         }
3426         if (resp->xdr.buf->page_len && test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3427                 WARN_ON_ONCE(1);
3428                 return nfserr_resource;
3429         }
3430         xdr_commit_encode(xdr);
3431
3432         maxcount = svc_max_payload(resp->rqstp);
3433         maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len));
3434         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3435
3436         if (!read->rd_filp) {
3437                 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
3438                                                 &file, &ra);
3439                 if (err)
3440                         goto err_truncate;
3441         }
3442
3443         if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3444                 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
3445         else
3446                 err = nfsd4_encode_readv(resp, read, file, maxcount);
3447
3448         if (!read->rd_filp)
3449                 nfsd_put_tmp_read_open(file, ra);
3450
3451 err_truncate:
3452         if (err)
3453                 xdr_truncate_encode(xdr, starting_len);
3454         return err;
3455 }
3456
3457 static __be32
3458 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3459 {
3460         int maxcount;
3461         __be32 wire_count;
3462         int zero = 0;
3463         struct xdr_stream *xdr = &resp->xdr;
3464         int length_offset = xdr->buf->len;
3465         __be32 *p;
3466
3467         if (nfserr)
3468                 return nfserr;
3469
3470         p = xdr_reserve_space(xdr, 4);
3471         if (!p)
3472                 return nfserr_resource;
3473         maxcount = PAGE_SIZE;
3474
3475         p = xdr_reserve_space(xdr, maxcount);
3476         if (!p)
3477                 return nfserr_resource;
3478         /*
3479          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3480          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3481          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3482          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3483          */
3484         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3485                                                 (char *)p, &maxcount);
3486         if (nfserr == nfserr_isdir)
3487                 nfserr = nfserr_inval;
3488         if (nfserr) {
3489                 xdr_truncate_encode(xdr, length_offset);
3490                 return nfserr;
3491         }
3492
3493         wire_count = htonl(maxcount);
3494         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3495         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3496         if (maxcount & 3)
3497                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3498                                                 &zero, 4 - (maxcount&3));
3499         return 0;
3500 }
3501
3502 static __be32
3503 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3504 {
3505         int maxcount;
3506         int bytes_left;
3507         loff_t offset;
3508         __be64 wire_offset;
3509         struct xdr_stream *xdr = &resp->xdr;
3510         int starting_len = xdr->buf->len;
3511         __be32 *p;
3512
3513         if (nfserr)
3514                 return nfserr;
3515
3516         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3517         if (!p)
3518                 return nfserr_resource;
3519
3520         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3521         *p++ = cpu_to_be32(0);
3522         *p++ = cpu_to_be32(0);
3523         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3524                                 - (char *)resp->xdr.buf->head[0].iov_base;
3525
3526         /*
3527          * Number of bytes left for directory entries allowing for the
3528          * final 8 bytes of the readdir and a following failed op:
3529          */
3530         bytes_left = xdr->buf->buflen - xdr->buf->len
3531                         - COMPOUND_ERR_SLACK_SPACE - 8;
3532         if (bytes_left < 0) {
3533                 nfserr = nfserr_resource;
3534                 goto err_no_verf;
3535         }
3536         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3537         /*
3538          * Note the rfc defines rd_maxcount as the size of the
3539          * READDIR4resok structure, which includes the verifier above
3540          * and the 8 bytes encoded at the end of this function:
3541          */
3542         if (maxcount < 16) {
3543                 nfserr = nfserr_toosmall;
3544                 goto err_no_verf;
3545         }
3546         maxcount = min_t(int, maxcount-16, bytes_left);
3547
3548         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3549         if (!readdir->rd_dircount)
3550                 readdir->rd_dircount = INT_MAX;
3551
3552         readdir->xdr = xdr;
3553         readdir->rd_maxcount = maxcount;
3554         readdir->common.err = 0;
3555         readdir->cookie_offset = 0;
3556
3557         offset = readdir->rd_cookie;
3558         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3559                               &offset,
3560                               &readdir->common, nfsd4_encode_dirent);
3561         if (nfserr == nfs_ok &&
3562             readdir->common.err == nfserr_toosmall &&
3563             xdr->buf->len == starting_len + 8) {
3564                 /* nothing encoded; which limit did we hit?: */
3565                 if (maxcount - 16 < bytes_left)
3566                         /* It was the fault of rd_maxcount: */
3567                         nfserr = nfserr_toosmall;
3568                 else
3569                         /* We ran out of buffer space: */
3570                         nfserr = nfserr_resource;
3571         }
3572         if (nfserr)
3573                 goto err_no_verf;
3574
3575         if (readdir->cookie_offset) {
3576                 wire_offset = cpu_to_be64(offset);
3577                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3578                                                         &wire_offset, 8);
3579         }
3580
3581         p = xdr_reserve_space(xdr, 8);
3582         if (!p) {
3583                 WARN_ON_ONCE(1);
3584                 goto err_no_verf;
3585         }
3586         *p++ = 0;       /* no more entries */
3587         *p++ = htonl(readdir->common.err == nfserr_eof);
3588
3589         return 0;
3590 err_no_verf:
3591         xdr_truncate_encode(xdr, starting_len);
3592         return nfserr;
3593 }
3594
3595 static __be32
3596 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3597 {
3598         struct xdr_stream *xdr = &resp->xdr;
3599         __be32 *p;
3600
3601         if (!nfserr) {
3602                 p = xdr_reserve_space(xdr, 20);
3603                 if (!p)
3604                         return nfserr_resource;
3605                 p = encode_cinfo(p, &remove->rm_cinfo);
3606         }
3607         return nfserr;
3608 }
3609
3610 static __be32
3611 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3612 {
3613         struct xdr_stream *xdr = &resp->xdr;
3614         __be32 *p;
3615
3616         if (!nfserr) {
3617                 p = xdr_reserve_space(xdr, 40);
3618                 if (!p)
3619                         return nfserr_resource;
3620                 p = encode_cinfo(p, &rename->rn_sinfo);
3621                 p = encode_cinfo(p, &rename->rn_tinfo);
3622         }
3623         return nfserr;
3624 }
3625
3626 static __be32
3627 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3628                          __be32 nfserr, struct svc_export *exp)
3629 {
3630         u32 i, nflavs, supported;
3631         struct exp_flavor_info *flavs;
3632         struct exp_flavor_info def_flavs[2];
3633         __be32 *p, *flavorsp;
3634         static bool report = true;
3635
3636         if (nfserr)
3637                 goto out;
3638         nfserr = nfserr_resource;
3639         if (exp->ex_nflavors) {
3640                 flavs = exp->ex_flavors;
3641                 nflavs = exp->ex_nflavors;
3642         } else { /* Handling of some defaults in absence of real secinfo: */
3643                 flavs = def_flavs;
3644                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3645                         nflavs = 2;
3646                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3647                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3648                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3649                         nflavs = 1;
3650                         flavs[0].pseudoflavor
3651                                         = svcauth_gss_flavor(exp->ex_client);
3652                 } else {
3653                         nflavs = 1;
3654                         flavs[0].pseudoflavor
3655                                         = exp->ex_client->flavour->flavour;
3656                 }
3657         }
3658
3659         supported = 0;
3660         p = xdr_reserve_space(xdr, 4);
3661         if (!p)
3662                 goto out;
3663         flavorsp = p++;         /* to be backfilled later */
3664
3665         for (i = 0; i < nflavs; i++) {
3666                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3667                 struct rpcsec_gss_info info;
3668
3669                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3670                         supported++;
3671                         p = xdr_reserve_space(xdr, 4 + 4 +
3672                                               XDR_LEN(info.oid.len) + 4 + 4);
3673                         if (!p)
3674                                 goto out;
3675                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3676                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3677                         *p++ = cpu_to_be32(info.qop);
3678                         *p++ = cpu_to_be32(info.service);
3679                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3680                         supported++;
3681                         p = xdr_reserve_space(xdr, 4);
3682                         if (!p)
3683                                 goto out;
3684                         *p++ = cpu_to_be32(pf);
3685                 } else {
3686                         if (report)
3687                                 pr_warn("NFS: SECINFO: security flavor %u "
3688                                         "is not supported\n", pf);
3689                 }
3690         }
3691
3692         if (nflavs != supported)
3693                 report = false;
3694         *flavorsp = htonl(supported);
3695         nfserr = 0;
3696 out:
3697         if (exp)
3698                 exp_put(exp);
3699         return nfserr;
3700 }
3701
3702 static __be32
3703 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3704                      struct nfsd4_secinfo *secinfo)
3705 {
3706         struct xdr_stream *xdr = &resp->xdr;
3707
3708         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3709 }
3710
3711 static __be32
3712 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3713                      struct nfsd4_secinfo_no_name *secinfo)
3714 {
3715         struct xdr_stream *xdr = &resp->xdr;
3716
3717         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3718 }
3719
3720 /*
3721  * The SETATTR encode routine is special -- it always encodes a bitmap,
3722  * regardless of the error status.
3723  */
3724 static __be32
3725 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3726 {
3727         struct xdr_stream *xdr = &resp->xdr;
3728         __be32 *p;
3729
3730         p = xdr_reserve_space(xdr, 16);
3731         if (!p)
3732                 return nfserr_resource;
3733         if (nfserr) {
3734                 *p++ = cpu_to_be32(3);
3735                 *p++ = cpu_to_be32(0);
3736                 *p++ = cpu_to_be32(0);
3737                 *p++ = cpu_to_be32(0);
3738         }
3739         else {
3740                 *p++ = cpu_to_be32(3);
3741                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3742                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3743                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3744         }
3745         return nfserr;
3746 }
3747
3748 static __be32
3749 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3750 {
3751         struct xdr_stream *xdr = &resp->xdr;
3752         __be32 *p;
3753
3754         if (!nfserr) {
3755                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3756                 if (!p)
3757                         return nfserr_resource;
3758                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3759                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3760                                                 NFS4_VERIFIER_SIZE);
3761         }
3762         else if (nfserr == nfserr_clid_inuse) {
3763                 p = xdr_reserve_space(xdr, 8);
3764                 if (!p)
3765                         return nfserr_resource;
3766                 *p++ = cpu_to_be32(0);
3767                 *p++ = cpu_to_be32(0);
3768         }
3769         return nfserr;
3770 }
3771
3772 static __be32
3773 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3774 {
3775         struct xdr_stream *xdr = &resp->xdr;
3776         __be32 *p;
3777
3778         if (!nfserr) {
3779                 p = xdr_reserve_space(xdr, 16);
3780                 if (!p)
3781                         return nfserr_resource;
3782                 *p++ = cpu_to_be32(write->wr_bytes_written);
3783                 *p++ = cpu_to_be32(write->wr_how_written);
3784                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3785                                                         NFS4_VERIFIER_SIZE);
3786         }
3787         return nfserr;
3788 }
3789
3790 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3791         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3792               1 << (OP_EXCHANGE_ID - 32) |
3793               1 << (OP_CREATE_SESSION - 32) |
3794               1 << (OP_DESTROY_SESSION - 32) |
3795               1 << (OP_DESTROY_CLIENTID - 32)
3796 };
3797
3798 static __be32
3799 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3800                          struct nfsd4_exchange_id *exid)
3801 {
3802         struct xdr_stream *xdr = &resp->xdr;
3803         __be32 *p;
3804         char *major_id;
3805         char *server_scope;
3806         int major_id_sz;
3807         int server_scope_sz;
3808         uint64_t minor_id = 0;
3809
3810         if (nfserr)
3811                 return nfserr;
3812
3813         major_id = utsname()->nodename;
3814         major_id_sz = strlen(major_id);
3815         server_scope = utsname()->nodename;
3816         server_scope_sz = strlen(server_scope);
3817
3818         p = xdr_reserve_space(xdr,
3819                 8 /* eir_clientid */ +
3820                 4 /* eir_sequenceid */ +
3821                 4 /* eir_flags */ +
3822                 4 /* spr_how */);
3823         if (!p)
3824                 return nfserr_resource;
3825
3826         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3827         *p++ = cpu_to_be32(exid->seqid);
3828         *p++ = cpu_to_be32(exid->flags);
3829
3830         *p++ = cpu_to_be32(exid->spa_how);
3831
3832         switch (exid->spa_how) {
3833         case SP4_NONE:
3834                 break;
3835         case SP4_MACH_CRED:
3836                 /* spo_must_enforce, spo_must_allow */
3837                 p = xdr_reserve_space(xdr, 16);
3838                 if (!p)
3839                         return nfserr_resource;
3840
3841                 /* spo_must_enforce bitmap: */
3842                 *p++ = cpu_to_be32(2);
3843                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3844                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3845                 /* empty spo_must_allow bitmap: */
3846                 *p++ = cpu_to_be32(0);
3847
3848                 break;
3849         default:
3850                 WARN_ON_ONCE(1);
3851         }
3852
3853         p = xdr_reserve_space(xdr,
3854                 8 /* so_minor_id */ +
3855                 4 /* so_major_id.len */ +
3856                 (XDR_QUADLEN(major_id_sz) * 4) +
3857                 4 /* eir_server_scope.len */ +
3858                 (XDR_QUADLEN(server_scope_sz) * 4) +
3859                 4 /* eir_server_impl_id.count (0) */);
3860         if (!p)
3861                 return nfserr_resource;
3862
3863         /* The server_owner struct */
3864         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3865         /* major id */
3866         p = xdr_encode_opaque(p, major_id, major_id_sz);
3867
3868         /* Server scope */
3869         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3870
3871         /* Implementation id */
3872         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3873         return 0;
3874 }
3875
3876 static __be32
3877 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3878                             struct nfsd4_create_session *sess)
3879 {
3880         struct xdr_stream *xdr = &resp->xdr;
3881         __be32 *p;
3882
3883         if (nfserr)
3884                 return nfserr;
3885
3886         p = xdr_reserve_space(xdr, 24);
3887         if (!p)
3888                 return nfserr_resource;
3889         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3890                                         NFS4_MAX_SESSIONID_LEN);
3891         *p++ = cpu_to_be32(sess->seqid);
3892         *p++ = cpu_to_be32(sess->flags);
3893
3894         p = xdr_reserve_space(xdr, 28);
3895         if (!p)
3896                 return nfserr_resource;
3897         *p++ = cpu_to_be32(0); /* headerpadsz */
3898         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3899         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3900         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3901         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3902         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3903         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3904
3905         if (sess->fore_channel.nr_rdma_attrs) {
3906                 p = xdr_reserve_space(xdr, 4);
3907                 if (!p)
3908                         return nfserr_resource;
3909                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3910         }
3911
3912         p = xdr_reserve_space(xdr, 28);
3913         if (!p)
3914                 return nfserr_resource;
3915         *p++ = cpu_to_be32(0); /* headerpadsz */
3916         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3917         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3918         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3919         *p++ = cpu_to_be32(sess->back_channel.maxops);
3920         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3921         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3922
3923         if (sess->back_channel.nr_rdma_attrs) {
3924                 p = xdr_reserve_space(xdr, 4);
3925                 if (!p)
3926                         return nfserr_resource;
3927                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3928         }
3929         return 0;
3930 }
3931
3932 static __be32
3933 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3934                       struct nfsd4_sequence *seq)
3935 {
3936         struct xdr_stream *xdr = &resp->xdr;
3937         __be32 *p;
3938
3939         if (nfserr)
3940                 return nfserr;
3941
3942         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3943         if (!p)
3944                 return nfserr_resource;
3945         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
3946                                         NFS4_MAX_SESSIONID_LEN);
3947         *p++ = cpu_to_be32(seq->seqid);
3948         *p++ = cpu_to_be32(seq->slotid);
3949         /* Note slotid's are numbered from zero: */
3950         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
3951         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
3952         *p++ = cpu_to_be32(seq->status_flags);
3953
3954         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3955         return 0;
3956 }
3957
3958 static __be32
3959 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3960                           struct nfsd4_test_stateid *test_stateid)
3961 {
3962         struct xdr_stream *xdr = &resp->xdr;
3963         struct nfsd4_test_stateid_id *stateid, *next;
3964         __be32 *p;
3965
3966         if (nfserr)
3967                 return nfserr;
3968
3969         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3970         if (!p)
3971                 return nfserr_resource;
3972         *p++ = htonl(test_stateid->ts_num_ids);
3973
3974         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3975                 *p++ = stateid->ts_id_status;
3976         }
3977
3978         return nfserr;
3979 }
3980
3981 #ifdef CONFIG_NFSD_PNFS
3982 static __be32
3983 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3984                 struct nfsd4_getdeviceinfo *gdev)
3985 {
3986         struct xdr_stream *xdr = &resp->xdr;
3987         const struct nfsd4_layout_ops *ops =
3988                 nfsd4_layout_ops[gdev->gd_layout_type];
3989         u32 starting_len = xdr->buf->len, needed_len;
3990         __be32 *p;
3991
3992         dprintk("%s: err %d\n", __func__, nfserr);
3993         if (nfserr)
3994                 goto out;
3995
3996         nfserr = nfserr_resource;
3997         p = xdr_reserve_space(xdr, 4);
3998         if (!p)
3999                 goto out;
4000
4001         *p++ = cpu_to_be32(gdev->gd_layout_type);
4002
4003         /* If maxcount is 0 then just update notifications */
4004         if (gdev->gd_maxcount != 0) {
4005                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4006                 if (nfserr) {
4007                         /*
4008                          * We don't bother to burden the layout drivers with
4009                          * enforcing gd_maxcount, just tell the client to
4010                          * come back with a bigger buffer if it's not enough.
4011                          */
4012                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4013                                 goto toosmall;
4014                         goto out;
4015                 }
4016         }
4017
4018         nfserr = nfserr_resource;
4019         if (gdev->gd_notify_types) {
4020                 p = xdr_reserve_space(xdr, 4 + 4);
4021                 if (!p)
4022                         goto out;
4023                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4024                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4025         } else {
4026                 p = xdr_reserve_space(xdr, 4);
4027                 if (!p)
4028                         goto out;
4029                 *p++ = 0;
4030         }
4031
4032         nfserr = 0;
4033 out:
4034         kfree(gdev->gd_device);
4035         dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4036         return nfserr;
4037
4038 toosmall:
4039         dprintk("%s: maxcount too small\n", __func__);
4040         needed_len = xdr->buf->len + 4 /* notifications */;
4041         xdr_truncate_encode(xdr, starting_len);
4042         p = xdr_reserve_space(xdr, 4);
4043         if (!p) {
4044                 nfserr = nfserr_resource;
4045         } else {
4046                 *p++ = cpu_to_be32(needed_len);
4047                 nfserr = nfserr_toosmall;
4048         }
4049         goto out;
4050 }
4051
4052 static __be32
4053 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4054                 struct nfsd4_layoutget *lgp)
4055 {
4056         struct xdr_stream *xdr = &resp->xdr;
4057         const struct nfsd4_layout_ops *ops =
4058                 nfsd4_layout_ops[lgp->lg_layout_type];
4059         __be32 *p;
4060
4061         dprintk("%s: err %d\n", __func__, nfserr);
4062         if (nfserr)
4063                 goto out;
4064
4065         nfserr = nfserr_resource;
4066         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4067         if (!p)
4068                 goto out;
4069
4070         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4071         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4072         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4073                                     sizeof(stateid_opaque_t));
4074
4075         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4076         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4077         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4078         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4079         *p++ = cpu_to_be32(lgp->lg_layout_type);
4080
4081         nfserr = ops->encode_layoutget(xdr, lgp);
4082 out:
4083         kfree(lgp->lg_content);
4084         return nfserr;
4085 }
4086
4087 static __be32
4088 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4089                           struct nfsd4_layoutcommit *lcp)
4090 {
4091         struct xdr_stream *xdr = &resp->xdr;
4092         __be32 *p;
4093
4094         if (nfserr)
4095                 return nfserr;
4096
4097         p = xdr_reserve_space(xdr, 4);
4098         if (!p)
4099                 return nfserr_resource;
4100         *p++ = cpu_to_be32(lcp->lc_size_chg);
4101         if (lcp->lc_size_chg) {
4102                 p = xdr_reserve_space(xdr, 8);
4103                 if (!p)
4104                         return nfserr_resource;
4105                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4106         }
4107
4108         return nfs_ok;
4109 }
4110
4111 static __be32
4112 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4113                 struct nfsd4_layoutreturn *lrp)
4114 {
4115         struct xdr_stream *xdr = &resp->xdr;
4116         __be32 *p;
4117
4118         if (nfserr)
4119                 return nfserr;
4120
4121         p = xdr_reserve_space(xdr, 4);
4122         if (!p)
4123                 return nfserr_resource;
4124         *p++ = cpu_to_be32(lrp->lrs_present);
4125         if (lrp->lrs_present)
4126                 nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4127         return nfs_ok;
4128 }
4129 #endif /* CONFIG_NFSD_PNFS */
4130
4131 static __be32
4132 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4133                   struct nfsd4_seek *seek)
4134 {
4135         __be32 *p;
4136
4137         if (nfserr)
4138                 return nfserr;
4139
4140         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4141         *p++ = cpu_to_be32(seek->seek_eof);
4142         p = xdr_encode_hyper(p, seek->seek_pos);
4143
4144         return nfserr;
4145 }
4146
4147 static __be32
4148 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4149 {
4150         return nfserr;
4151 }
4152
4153 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4154
4155 /*
4156  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4157  * since we don't need to filter out obsolete ops as this is
4158  * done in the decoding phase.
4159  */
4160 static nfsd4_enc nfsd4_enc_ops[] = {
4161         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4162         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4163         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4164         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4165         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4166         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4167         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4168         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4169         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4170         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4171         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4172         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4173         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4174         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4175         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4176         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4177         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4178         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4179         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4180         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4181         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4182         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4183         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4184         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4185         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4186         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4187         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4188         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4189         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4190         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4191         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4192         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4193         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4194         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4195         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4196         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4197         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4198
4199         /* NFSv4.1 operations */
4200         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4201         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4202         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4203         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4204         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4205         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4206         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4207 #ifdef CONFIG_NFSD_PNFS
4208         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4209         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4210         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4211         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4212         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4213 #else
4214         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4215         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4216         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4217         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4218         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4219 #endif
4220         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4221         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4222         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4223         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4224         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4225         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4226         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4227
4228         /* NFSv4.2 operations */
4229         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4230         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_noop,
4231         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4232         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4233         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4234         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4235         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4236         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4237         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4238         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4239         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4240         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4241 };
4242
4243 /*
4244  * Calculate whether we still have space to encode repsize bytes.
4245  * There are two considerations:
4246  *     - For NFS versions >=4.1, the size of the reply must stay within
4247  *       session limits
4248  *     - For all NFS versions, we must stay within limited preallocated
4249  *       buffer space.
4250  *
4251  * This is called before the operation is processed, so can only provide
4252  * an upper estimate.  For some nonidempotent operations (such as
4253  * getattr), it's not necessarily a problem if that estimate is wrong,
4254  * as we can fail it after processing without significant side effects.
4255  */
4256 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4257 {
4258         struct xdr_buf *buf = &resp->rqstp->rq_res;
4259         struct nfsd4_slot *slot = resp->cstate.slot;
4260
4261         if (buf->len + respsize <= buf->buflen)
4262                 return nfs_ok;
4263         if (!nfsd4_has_session(&resp->cstate))
4264                 return nfserr_resource;
4265         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4266                 WARN_ON_ONCE(1);
4267                 return nfserr_rep_too_big_to_cache;
4268         }
4269         return nfserr_rep_too_big;
4270 }
4271
4272 void
4273 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4274 {
4275         struct xdr_stream *xdr = &resp->xdr;
4276         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4277         struct svc_rqst *rqstp = resp->rqstp;
4278         int post_err_offset;
4279         nfsd4_enc encoder;
4280         __be32 *p;
4281
4282         p = xdr_reserve_space(xdr, 8);
4283         if (!p) {
4284                 WARN_ON_ONCE(1);
4285                 return;
4286         }
4287         *p++ = cpu_to_be32(op->opnum);
4288         post_err_offset = xdr->buf->len;
4289
4290         if (op->opnum == OP_ILLEGAL)
4291                 goto status;
4292         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4293                !nfsd4_enc_ops[op->opnum]);
4294         encoder = nfsd4_enc_ops[op->opnum];
4295         op->status = encoder(resp, op->status, &op->u);
4296         xdr_commit_encode(xdr);
4297
4298         /* nfsd4_check_resp_size guarantees enough room for error status */
4299         if (!op->status) {
4300                 int space_needed = 0;
4301                 if (!nfsd4_last_compound_op(rqstp))
4302                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4303                 op->status = nfsd4_check_resp_size(resp, space_needed);
4304         }
4305         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4306                 struct nfsd4_slot *slot = resp->cstate.slot;
4307
4308                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4309                         op->status = nfserr_rep_too_big_to_cache;
4310                 else
4311                         op->status = nfserr_rep_too_big;
4312         }
4313         if (op->status == nfserr_resource ||
4314             op->status == nfserr_rep_too_big ||
4315             op->status == nfserr_rep_too_big_to_cache) {
4316                 /*
4317                  * The operation may have already been encoded or
4318                  * partially encoded.  No op returns anything additional
4319                  * in the case of one of these three errors, so we can
4320                  * just truncate back to after the status.  But it's a
4321                  * bug if we had to do this on a non-idempotent op:
4322                  */
4323                 warn_on_nonidempotent_op(op);
4324                 xdr_truncate_encode(xdr, post_err_offset);
4325         }
4326         if (so) {
4327                 int len = xdr->buf->len - post_err_offset;
4328
4329                 so->so_replay.rp_status = op->status;
4330                 so->so_replay.rp_buflen = len;
4331                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4332                                                 so->so_replay.rp_buf, len);
4333         }
4334 status:
4335         /* Note that op->status is already in network byte order: */
4336         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4337 }
4338
4339 /*
4340  * Encode the reply stored in the stateowner reply cache
4341  *
4342  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4343  * previously sent already encoded operation.
4344  */
4345 void
4346 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4347 {
4348         __be32 *p;
4349         struct nfs4_replay *rp = op->replay;
4350
4351         BUG_ON(!rp);
4352
4353         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4354         if (!p) {
4355                 WARN_ON_ONCE(1);
4356                 return;
4357         }
4358         *p++ = cpu_to_be32(op->opnum);
4359         *p++ = rp->rp_status;  /* already xdr'ed */
4360
4361         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4362 }
4363
4364 int
4365 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4366 {
4367         return xdr_ressize_check(rqstp, p);
4368 }
4369
4370 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4371 {
4372         struct svc_rqst *rqstp = rq;
4373         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4374
4375         if (args->ops != args->iops) {
4376                 kfree(args->ops);
4377                 args->ops = args->iops;
4378         }
4379         kfree(args->tmpp);
4380         args->tmpp = NULL;
4381         while (args->to_free) {
4382                 struct svcxdr_tmpbuf *tb = args->to_free;
4383                 args->to_free = tb->next;
4384                 kfree(tb);
4385         }
4386         return 1;
4387 }
4388
4389 int
4390 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4391 {
4392         if (rqstp->rq_arg.head[0].iov_len % 4) {
4393                 /* client is nuts */
4394                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4395                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4396                 return 0;
4397         }
4398         args->p = p;
4399         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4400         args->pagelist = rqstp->rq_arg.pages;
4401         args->pagelen = rqstp->rq_arg.page_len;
4402         args->tmpp = NULL;
4403         args->to_free = NULL;
4404         args->ops = args->iops;
4405         args->rqstp = rqstp;
4406
4407         return !nfsd4_decode_compound(args);
4408 }
4409
4410 int
4411 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4412 {
4413         /*
4414          * All that remains is to write the tag and operation count...
4415          */
4416         struct xdr_buf *buf = resp->xdr.buf;
4417
4418         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4419                                  buf->tail[0].iov_len);
4420
4421         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4422
4423         p = resp->tagp;
4424         *p++ = htonl(resp->taglen);
4425         memcpy(p, resp->tag, resp->taglen);
4426         p += XDR_QUADLEN(resp->taglen);
4427         *p++ = htonl(resp->opcnt);
4428
4429         nfsd4_sequence_done(resp);
4430         return 1;
4431 }
4432
4433 /*
4434  * Local variables:
4435  *  c-basic-offset: 8
4436  * End:
4437  */