kernel/fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 #include <linux/slab.h>
  37 #include <linux/namei.h>
  38 #include <linux/statfs.h>
  39 #include <linux/utsname.h>
  40 #include <linux/pagemap.h>
  41 #include <linux/sunrpc/svcauth_gss.h>
  42
  43 #include "idmap.h"
  44 #include "acl.h"
  45 #include "xdr4.h"
  46 #include "vfs.h"
  47 #include "state.h"
  48 #include "cache.h"
  49 #include "netns.h"
  50 #include "pnfs.h"
  51
  52 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  53 #include <linux/security.h>
  54 #endif
  55
  56
  57 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  58
  59 /*
  60  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  61  * directory in order to indicate to the client that a filesystem boundary is present
  62  * We use a fixed fsid for a referral
  63  */
  64 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  65 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  66
  67 static __be32
  68 check_filename(char *str, int len)
  69 {
  70         int i;
  71
  72         if (len == 0)
  73                 return nfserr_inval;
  74         if (isdotent(str, len))
  75                 return nfserr_badname;
  76         for (i = 0; i < len; i++)
  77                 if (str[i] == '/')
  78                         return nfserr_badname;
  79         return 0;
  80 }
  81
  82 #define DECODE_HEAD                             \
  83         __be32 *p;                              \
  84         __be32 status
  85 #define DECODE_TAIL                             \
  86         status = 0;                             \
  87 out:                                            \
  88         return status;                          \
  89 xdr_error:                                      \
  90         dprintk("NFSD: xdr error (%s:%d)\n",    \
  91                         __FILE__, __LINE__);    \
  92         status = nfserr_bad_xdr;                \
  93         goto out
  94
  95 #define READMEM(x,nbytes) do {                  \
  96         x = (char *)p;                          \
  97         p += XDR_QUADLEN(nbytes);               \
  98 } while (0)
  99 #define SAVEMEM(x,nbytes) do {                  \
 100         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 101                 savemem(argp, p, nbytes) :      \
 102                 (char *)p)) {                   \
 103                 dprintk("NFSD: xdr error (%s:%d)\n", \
 104                                 __FILE__, __LINE__); \
 105                 goto xdr_error;                 \
 106                 }                               \
 107         p += XDR_QUADLEN(nbytes);               \
 108 } while (0)
 109 #define COPYMEM(x,nbytes) do {                  \
 110         memcpy((x), p, nbytes);                 \
 111         p += XDR_QUADLEN(nbytes);               \
 112 } while (0)
 113
 114 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 115 #define READ_BUF(nbytes)  do {                  \
 116         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 117                 p = argp->p;                    \
 118                 argp->p += XDR_QUADLEN(nbytes); \
 119         } else if (!(p = read_buf(argp, nbytes))) { \
 120                 dprintk("NFSD: xdr error (%s:%d)\n", \
 121                                 __FILE__, __LINE__); \
 122                 goto xdr_error;                 \
 123         }                                       \
 124 } while (0)
 125
 126 static void next_decode_page(struct nfsd4_compoundargs *argp)
 127 {
 128         argp->p = page_address(argp->pagelist[0]);
 129         argp->pagelist++;
 130         if (argp->pagelen < PAGE_SIZE) {
 131                 argp->end = argp->p + (argp->pagelen>>2);
 132                 argp->pagelen = 0;
 133         } else {
 134                 argp->end = argp->p + (PAGE_SIZE>>2);
 135                 argp->pagelen -= PAGE_SIZE;
 136         }
 137 }
 138
 139 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 140 {
 141         /* We want more bytes than seem to be available.
 142          * Maybe we need a new page, maybe we have just run out
 143          */
 144         unsigned int avail = (char *)argp->end - (char *)argp->p;
 145         __be32 *p;
 146         if (avail + argp->pagelen < nbytes)
 147                 return NULL;
 148         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 149                 return NULL;
 150         /* ok, we can do it with the current plus the next page */
 151         if (nbytes <= sizeof(argp->tmp))
 152                 p = argp->tmp;
 153         else {
 154                 kfree(argp->tmpp);
 155                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 156                 if (!p)
 157                         return NULL;
 158
 159         }
 160         /*
 161          * The following memcpy is safe because read_buf is always
 162          * called with nbytes > avail, and the two cases above both
 163          * guarantee p points to at least nbytes bytes.
 164          */
 165         memcpy(p, argp->p, avail);
 166         next_decode_page(argp);
 167         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 168         argp->p += XDR_QUADLEN(nbytes - avail);
 169         return p;
 170 }
 171
 172 static int zero_clientid(clientid_t *clid)
 173 {
 174         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 175 }
 176
 177 /**
 178  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 179  * @argp: NFSv4 compound argument structure
 180  * @p: pointer to be freed (with kfree())
 181  *
 182  * Marks @p to be freed when processing the compound operation
 183  * described in @argp finishes.
 184  */
 185 static void *
 186 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 187 {
 188         struct svcxdr_tmpbuf *tb;
 189
 190         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 191         if (!tb)
 192                 return NULL;
 193         tb->next = argp->to_free;
 194         argp->to_free = tb;
 195         return tb->buf;
 196 }
 197
 198 /*
 199  * For xdr strings that need to be passed to other kernel api's
 200  * as null-terminated strings.
 201  *
 202  * Note null-terminating in place usually isn't safe since the
 203  * buffer might end on a page boundary.
 204  */
 205 static char *
 206 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 207 {
 208         char *p = svcxdr_tmpalloc(argp, len + 1);
 209
 210         if (!p)
 211                 return NULL;
 212         memcpy(p, buf, len);
 213         p[len] = '\0';
 214         return p;
 215 }
 216
 217 /**
 218  * savemem - duplicate a chunk of memory for later processing
 219  * @argp: NFSv4 compound argument structure to be freed with
 220  * @p: pointer to be duplicated
 221  * @nbytes: length to be duplicated
 222  *
 223  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 224  * that are preserved until processing of the NFSv4 compound
 225  * operation described by @argp finishes.
 226  */
 227 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 228 {
 229         void *ret;
 230
 231         ret = svcxdr_tmpalloc(argp, nbytes);
 232         if (!ret)
 233                 return NULL;
 234         memcpy(ret, p, nbytes);
 235         return ret;
 236 }
 237
 238 /*
 239  * We require the high 32 bits of 'seconds' to be 0, and
 240  * we ignore all 32 bits of 'nseconds'.
 241  */
 242 static __be32
 243 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
 244 {
 245         DECODE_HEAD;
 246         u64 sec;
 247
 248         READ_BUF(12);
 249         p = xdr_decode_hyper(p, &sec);
 250         tv->tv_sec = sec;
 251         tv->tv_nsec = be32_to_cpup(p++);
 252         if (tv->tv_nsec >= (u32)1000000000)
 253                 return nfserr_inval;
 254
 255         DECODE_TAIL;
 256 }
 257
 258 static __be32
 259 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 260 {
 261         u32 bmlen;
 262         DECODE_HEAD;
 263
 264         bmval[0] = 0;
 265         bmval[1] = 0;
 266         bmval[2] = 0;
 267
 268         READ_BUF(4);
 269         bmlen = be32_to_cpup(p++);
 270         if (bmlen > 1000)
 271                 goto xdr_error;
 272
 273         READ_BUF(bmlen << 2);
 274         if (bmlen > 0)
 275                 bmval[0] = be32_to_cpup(p++);
 276         if (bmlen > 1)
 277                 bmval[1] = be32_to_cpup(p++);
 278         if (bmlen > 2)
 279                 bmval[2] = be32_to_cpup(p++);
 280
 281         DECODE_TAIL;
 282 }
 283
 284 static __be32
 285 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 286                    struct iattr *iattr, struct nfs4_acl **acl,
 287                    struct xdr_netobj *label)
 288 {
 289         int expected_len, len = 0;
 290         u32 dummy32;
 291         char *buf;
 292
 293         DECODE_HEAD;
 294         iattr->ia_valid = 0;
 295         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 296                 return status;
 297
 298         READ_BUF(4);
 299         expected_len = be32_to_cpup(p++);
 300
 301         if (bmval[0] & FATTR4_WORD0_SIZE) {
 302                 READ_BUF(8);
 303                 len += 8;
 304                 p = xdr_decode_hyper(p, &iattr->ia_size);
 305                 iattr->ia_valid |= ATTR_SIZE;
 306         }
 307         if (bmval[0] & FATTR4_WORD0_ACL) {
 308                 u32 nace;
 309                 struct nfs4_ace *ace;
 310
 311                 READ_BUF(4); len += 4;
 312                 nace = be32_to_cpup(p++);
 313
 314                 if (nace > NFS4_ACL_MAX)
 315                         return nfserr_fbig;
 316
 317                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
 318                 if (*acl == NULL)
 319                         return nfserr_jukebox;
 320
 321                 (*acl)->naces = nace;
 322                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 323                         READ_BUF(16); len += 16;
 324                         ace->type = be32_to_cpup(p++);
 325                         ace->flag = be32_to_cpup(p++);
 326                         ace->access_mask = be32_to_cpup(p++);
 327                         dummy32 = be32_to_cpup(p++);
 328                         READ_BUF(dummy32);
 329                         len += XDR_QUADLEN(dummy32) << 2;
 330                         READMEM(buf, dummy32);
 331                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 332                         status = nfs_ok;
 333                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 334                                 ;
 335                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 336                                 status = nfsd_map_name_to_gid(argp->rqstp,
 337                                                 buf, dummy32, &ace->who_gid);
 338                         else
 339                                 status = nfsd_map_name_to_uid(argp->rqstp,
 340                                                 buf, dummy32, &ace->who_uid);
 341                         if (status)
 342                                 return status;
 343                 }
 344         } else
 345                 *acl = NULL;
 346         if (bmval[1] & FATTR4_WORD1_MODE) {
 347                 READ_BUF(4);
 348                 len += 4;
 349                 iattr->ia_mode = be32_to_cpup(p++);
 350                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 351                 iattr->ia_valid |= ATTR_MODE;
 352         }
 353         if (bmval[1] & FATTR4_WORD1_OWNER) {
 354                 READ_BUF(4);
 355                 len += 4;
 356                 dummy32 = be32_to_cpup(p++);
 357                 READ_BUF(dummy32);
 358                 len += (XDR_QUADLEN(dummy32) << 2);
 359                 READMEM(buf, dummy32);
 360                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 361                         return status;
 362                 iattr->ia_valid |= ATTR_UID;
 363         }
 364         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 365                 READ_BUF(4);
 366                 len += 4;
 367                 dummy32 = be32_to_cpup(p++);
 368                 READ_BUF(dummy32);
 369                 len += (XDR_QUADLEN(dummy32) << 2);
 370                 READMEM(buf, dummy32);
 371                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 372                         return status;
 373                 iattr->ia_valid |= ATTR_GID;
 374         }
 375         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 376                 READ_BUF(4);
 377                 len += 4;
 378                 dummy32 = be32_to_cpup(p++);
 379                 switch (dummy32) {
 380                 case NFS4_SET_TO_CLIENT_TIME:
 381                         len += 12;
 382                         status = nfsd4_decode_time(argp, &iattr->ia_atime);
 383                         if (status)
 384                                 return status;
 385                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 386                         break;
 387                 case NFS4_SET_TO_SERVER_TIME:
 388                         iattr->ia_valid |= ATTR_ATIME;
 389                         break;
 390                 default:
 391                         goto xdr_error;
 392                 }
 393         }
 394         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 395                 READ_BUF(4);
 396                 len += 4;
 397                 dummy32 = be32_to_cpup(p++);
 398                 switch (dummy32) {
 399                 case NFS4_SET_TO_CLIENT_TIME:
 400                         len += 12;
 401                         status = nfsd4_decode_time(argp, &iattr->ia_mtime);
 402                         if (status)
 403                                 return status;
 404                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 405                         break;
 406                 case NFS4_SET_TO_SERVER_TIME:
 407                         iattr->ia_valid |= ATTR_MTIME;
 408                         break;
 409                 default:
 410                         goto xdr_error;
 411                 }
 412         }
 413
 414         label->len = 0;
 415 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 416         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 417                 READ_BUF(4);
 418                 len += 4;
 419                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 420                 READ_BUF(4);
 421                 len += 4;
 422                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 423                 READ_BUF(4);
 424                 len += 4;
 425                 dummy32 = be32_to_cpup(p++);
 426                 READ_BUF(dummy32);
 427                 if (dummy32 > NFS4_MAXLABELLEN)
 428                         return nfserr_badlabel;
 429                 len += (XDR_QUADLEN(dummy32) << 2);
 430                 READMEM(buf, dummy32);
 431                 label->len = dummy32;
 432                 label->data = svcxdr_dupstr(argp, buf, dummy32);
 433                 if (!label->data)
 434                         return nfserr_jukebox;
 435         }
 436 #endif
 437
 438         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 439             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 440             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 441                 READ_BUF(expected_len - len);
 442         else if (len != expected_len)
 443                 goto xdr_error;
 444
 445         DECODE_TAIL;
 446 }
 447
 448 static __be32
 449 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 450 {
 451         DECODE_HEAD;
 452
 453         READ_BUF(sizeof(stateid_t));
 454         sid->si_generation = be32_to_cpup(p++);
 455         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 456
 457         DECODE_TAIL;
 458 }
 459
 460 static __be32
 461 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 462 {
 463         DECODE_HEAD;
 464
 465         READ_BUF(4);
 466         access->ac_req_access = be32_to_cpup(p++);
 467
 468         DECODE_TAIL;
 469 }
 470
 471 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 472 {
 473         DECODE_HEAD;
 474         u32 dummy, uid, gid;
 475         char *machine_name;
 476         int i;
 477         int nr_secflavs;
 478
 479         /* callback_sec_params4 */
 480         READ_BUF(4);
 481         nr_secflavs = be32_to_cpup(p++);
 482         if (nr_secflavs)
 483                 cbs->flavor = (u32)(-1);
 484         else
 485                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 486                 cbs->flavor = 0;
 487         for (i = 0; i < nr_secflavs; ++i) {
 488                 READ_BUF(4);
 489                 dummy = be32_to_cpup(p++);
 490                 switch (dummy) {
 491                 case RPC_AUTH_NULL:
 492                         /* Nothing to read */
 493                         if (cbs->flavor == (u32)(-1))
 494                                 cbs->flavor = RPC_AUTH_NULL;
 495                         break;
 496                 case RPC_AUTH_UNIX:
 497                         READ_BUF(8);
 498                         /* stamp */
 499                         dummy = be32_to_cpup(p++);
 500
 501                         /* machine name */
 502                         dummy = be32_to_cpup(p++);
 503                         READ_BUF(dummy);
 504                         SAVEMEM(machine_name, dummy);
 505
 506                         /* uid, gid */
 507                         READ_BUF(8);
 508                         uid = be32_to_cpup(p++);
 509                         gid = be32_to_cpup(p++);
 510
 511                         /* more gids */
 512                         READ_BUF(4);
 513                         dummy = be32_to_cpup(p++);
 514                         READ_BUF(dummy * 4);
 515                         if (cbs->flavor == (u32)(-1)) {
 516                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 517                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 518                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 519                                         cbs->uid = kuid;
 520                                         cbs->gid = kgid;
 521                                         cbs->flavor = RPC_AUTH_UNIX;
 522                                 } else {
 523                                         dprintk("RPC_AUTH_UNIX with invalid"
 524                                                 "uid or gid ignoring!\n");
 525                                 }
 526                         }
 527                         break;
 528                 case RPC_AUTH_GSS:
 529                         dprintk("RPC_AUTH_GSS callback secflavor "
 530                                 "not supported!\n");
 531                         READ_BUF(8);
 532                         /* gcbp_service */
 533                         dummy = be32_to_cpup(p++);
 534                         /* gcbp_handle_from_server */
 535                         dummy = be32_to_cpup(p++);
 536                         READ_BUF(dummy);
 537                         p += XDR_QUADLEN(dummy);
 538                         /* gcbp_handle_from_client */
 539                         READ_BUF(4);
 540                         dummy = be32_to_cpup(p++);
 541                         READ_BUF(dummy);
 542                         break;
 543                 default:
 544                         dprintk("Illegal callback secflavor\n");
 545                         return nfserr_inval;
 546                 }
 547         }
 548         DECODE_TAIL;
 549 }
 550
 551 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 552 {
 553         DECODE_HEAD;
 554
 555         READ_BUF(4);
 556         bc->bc_cb_program = be32_to_cpup(p++);
 557         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 558
 559         DECODE_TAIL;
 560 }
 561
 562 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 563 {
 564         DECODE_HEAD;
 565
 566         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 567         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 568         bcts->dir = be32_to_cpup(p++);
 569         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 570          * could help us figure out we should be using it. */
 571         DECODE_TAIL;
 572 }
 573
 574 static __be32
 575 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 576 {
 577         DECODE_HEAD;
 578
 579         READ_BUF(4);
 580         close->cl_seqid = be32_to_cpup(p++);
 581         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 582
 583         DECODE_TAIL;
 584 }
 585
 586
 587 static __be32
 588 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 589 {
 590         DECODE_HEAD;
 591
 592         READ_BUF(12);
 593         p = xdr_decode_hyper(p, &commit->co_offset);
 594         commit->co_count = be32_to_cpup(p++);
 595
 596         DECODE_TAIL;
 597 }
 598
 599 static __be32
 600 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 601 {
 602         DECODE_HEAD;
 603
 604         READ_BUF(4);
 605         create->cr_type = be32_to_cpup(p++);
 606         switch (create->cr_type) {
 607         case NF4LNK:
 608                 READ_BUF(4);
 609                 create->cr_datalen = be32_to_cpup(p++);
 610                 READ_BUF(create->cr_datalen);
 611                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 612                 if (!create->cr_data)
 613                         return nfserr_jukebox;
 614                 break;
 615         case NF4BLK:
 616         case NF4CHR:
 617                 READ_BUF(8);
 618                 create->cr_specdata1 = be32_to_cpup(p++);
 619                 create->cr_specdata2 = be32_to_cpup(p++);
 620                 break;
 621         case NF4SOCK:
 622         case NF4FIFO:
 623         case NF4DIR:
 624         default:
 625                 break;
 626         }
 627
 628         READ_BUF(4);
 629         create->cr_namelen = be32_to_cpup(p++);
 630         READ_BUF(create->cr_namelen);
 631         SAVEMEM(create->cr_name, create->cr_namelen);
 632         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 633                 return status;
 634
 635         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 636                                     &create->cr_acl, &create->cr_label);
 637         if (status)
 638                 goto out;
 639
 640         DECODE_TAIL;
 641 }
 642
 643 static inline __be32
 644 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 645 {
 646         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 647 }
 648
 649 static inline __be32
 650 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 651 {
 652         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 653 }
 654
 655 static __be32
 656 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 657 {
 658         DECODE_HEAD;
 659
 660         READ_BUF(4);
 661         link->li_namelen = be32_to_cpup(p++);
 662         READ_BUF(link->li_namelen);
 663         SAVEMEM(link->li_name, link->li_namelen);
 664         if ((status = check_filename(link->li_name, link->li_namelen)))
 665                 return status;
 666
 667         DECODE_TAIL;
 668 }
 669
 670 static __be32
 671 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 672 {
 673         DECODE_HEAD;
 674
 675         /*
 676         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 677         */
 678         READ_BUF(28);
 679         lock->lk_type = be32_to_cpup(p++);
 680         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 681                 goto xdr_error;
 682         lock->lk_reclaim = be32_to_cpup(p++);
 683         p = xdr_decode_hyper(p, &lock->lk_offset);
 684         p = xdr_decode_hyper(p, &lock->lk_length);
 685         lock->lk_is_new = be32_to_cpup(p++);
 686
 687         if (lock->lk_is_new) {
 688                 READ_BUF(4);
 689                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 690                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 691                 if (status)
 692                         return status;
 693                 READ_BUF(8 + sizeof(clientid_t));
 694                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 695                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 696                 lock->lk_new_owner.len = be32_to_cpup(p++);
 697                 READ_BUF(lock->lk_new_owner.len);
 698                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 699         } else {
 700                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 701                 if (status)
 702                         return status;
 703                 READ_BUF(4);
 704                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 705         }
 706
 707         DECODE_TAIL;
 708 }
 709
 710 static __be32
 711 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 712 {
 713         DECODE_HEAD;
 714
 715         READ_BUF(32);
 716         lockt->lt_type = be32_to_cpup(p++);
 717         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 718                 goto xdr_error;
 719         p = xdr_decode_hyper(p, &lockt->lt_offset);
 720         p = xdr_decode_hyper(p, &lockt->lt_length);
 721         COPYMEM(&lockt->lt_clientid, 8);
 722         lockt->lt_owner.len = be32_to_cpup(p++);
 723         READ_BUF(lockt->lt_owner.len);
 724         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 725
 726         DECODE_TAIL;
 727 }
 728
 729 static __be32
 730 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 731 {
 732         DECODE_HEAD;
 733
 734         READ_BUF(8);
 735         locku->lu_type = be32_to_cpup(p++);
 736         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 737                 goto xdr_error;
 738         locku->lu_seqid = be32_to_cpup(p++);
 739         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 740         if (status)
 741                 return status;
 742         READ_BUF(16);
 743         p = xdr_decode_hyper(p, &locku->lu_offset);
 744         p = xdr_decode_hyper(p, &locku->lu_length);
 745
 746         DECODE_TAIL;
 747 }
 748
 749 static __be32
 750 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 751 {
 752         DECODE_HEAD;
 753
 754         READ_BUF(4);
 755         lookup->lo_len = be32_to_cpup(p++);
 756         READ_BUF(lookup->lo_len);
 757         SAVEMEM(lookup->lo_name, lookup->lo_len);
 758         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 759                 return status;
 760
 761         DECODE_TAIL;
 762 }
 763
 764 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 765 {
 766         __be32 *p;
 767         u32 w;
 768
 769         READ_BUF(4);
 770         w = be32_to_cpup(p++);
 771         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 772         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 773         if (deleg_when)
 774                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 775
 776         switch (w & NFS4_SHARE_ACCESS_MASK) {
 777         case NFS4_SHARE_ACCESS_READ:
 778         case NFS4_SHARE_ACCESS_WRITE:
 779         case NFS4_SHARE_ACCESS_BOTH:
 780                 break;
 781         default:
 782                 return nfserr_bad_xdr;
 783         }
 784         w &= ~NFS4_SHARE_ACCESS_MASK;
 785         if (!w)
 786                 return nfs_ok;
 787         if (!argp->minorversion)
 788                 return nfserr_bad_xdr;
 789         switch (w & NFS4_SHARE_WANT_MASK) {
 790         case NFS4_SHARE_WANT_NO_PREFERENCE:
 791         case NFS4_SHARE_WANT_READ_DELEG:
 792         case NFS4_SHARE_WANT_WRITE_DELEG:
 793         case NFS4_SHARE_WANT_ANY_DELEG:
 794         case NFS4_SHARE_WANT_NO_DELEG:
 795         case NFS4_SHARE_WANT_CANCEL:
 796                 break;
 797         default:
 798                 return nfserr_bad_xdr;
 799         }
 800         w &= ~NFS4_SHARE_WANT_MASK;
 801         if (!w)
 802                 return nfs_ok;
 803
 804         if (!deleg_when)        /* open_downgrade */
 805                 return nfserr_inval;
 806         switch (w) {
 807         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 808         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 809         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 810               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 811                 return nfs_ok;
 812         }
 813 xdr_error:
 814         return nfserr_bad_xdr;
 815 }
 816
 817 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 818 {
 819         __be32 *p;
 820
 821         READ_BUF(4);
 822         *x = be32_to_cpup(p++);
 823         /* Note: unlinke access bits, deny bits may be zero. */
 824         if (*x & ~NFS4_SHARE_DENY_BOTH)
 825                 return nfserr_bad_xdr;
 826         return nfs_ok;
 827 xdr_error:
 828         return nfserr_bad_xdr;
 829 }
 830
 831 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 832 {
 833         __be32 *p;
 834
 835         READ_BUF(4);
 836         o->len = be32_to_cpup(p++);
 837
 838         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 839                 return nfserr_bad_xdr;
 840
 841         READ_BUF(o->len);
 842         SAVEMEM(o->data, o->len);
 843         return nfs_ok;
 844 xdr_error:
 845         return nfserr_bad_xdr;
 846 }
 847
 848 static __be32
 849 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 850 {
 851         DECODE_HEAD;
 852         u32 dummy;
 853
 854         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 855         open->op_iattr.ia_valid = 0;
 856         open->op_openowner = NULL;
 857
 858         open->op_xdr_error = 0;
 859         /* seqid, share_access, share_deny, clientid, ownerlen */
 860         READ_BUF(4);
 861         open->op_seqid = be32_to_cpup(p++);
 862         /* decode, yet ignore deleg_when until supported */
 863         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 864                                            &open->op_deleg_want, &dummy);
 865         if (status)
 866                 goto xdr_error;
 867         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 868         if (status)
 869                 goto xdr_error;
 870         READ_BUF(sizeof(clientid_t));
 871         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 872         status = nfsd4_decode_opaque(argp, &open->op_owner);
 873         if (status)
 874                 goto xdr_error;
 875         READ_BUF(4);
 876         open->op_create = be32_to_cpup(p++);
 877         switch (open->op_create) {
 878         case NFS4_OPEN_NOCREATE:
 879                 break;
 880         case NFS4_OPEN_CREATE:
 881                 READ_BUF(4);
 882                 open->op_createmode = be32_to_cpup(p++);
 883                 switch (open->op_createmode) {
 884                 case NFS4_CREATE_UNCHECKED:
 885                 case NFS4_CREATE_GUARDED:
 886                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 887                                 &open->op_iattr, &open->op_acl, &open->op_label);
 888                         if (status)
 889                                 goto out;
 890                         break;
 891                 case NFS4_CREATE_EXCLUSIVE:
 892                         READ_BUF(NFS4_VERIFIER_SIZE);
 893                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 894                         break;
 895                 case NFS4_CREATE_EXCLUSIVE4_1:
 896                         if (argp->minorversion < 1)
 897                                 goto xdr_error;
 898                         READ_BUF(NFS4_VERIFIER_SIZE);
 899                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 900                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 901                                 &open->op_iattr, &open->op_acl, &open->op_label);
 902                         if (status)
 903                                 goto out;
 904                         break;
 905                 default:
 906                         goto xdr_error;
 907                 }
 908                 break;
 909         default:
 910                 goto xdr_error;
 911         }
 912
 913         /* open_claim */
 914         READ_BUF(4);
 915         open->op_claim_type = be32_to_cpup(p++);
 916         switch (open->op_claim_type) {
 917         case NFS4_OPEN_CLAIM_NULL:
 918         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 919                 READ_BUF(4);
 920                 open->op_fname.len = be32_to_cpup(p++);
 921                 READ_BUF(open->op_fname.len);
 922                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 923                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 924                         return status;
 925                 break;
 926         case NFS4_OPEN_CLAIM_PREVIOUS:
 927                 READ_BUF(4);
 928                 open->op_delegate_type = be32_to_cpup(p++);
 929                 break;
 930         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 931                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 932                 if (status)
 933                         return status;
 934                 READ_BUF(4);
 935                 open->op_fname.len = be32_to_cpup(p++);
 936                 READ_BUF(open->op_fname.len);
 937                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 938                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 939                         return status;
 940                 break;
 941         case NFS4_OPEN_CLAIM_FH:
 942         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 943                 if (argp->minorversion < 1)
 944                         goto xdr_error;
 945                 /* void */
 946                 break;
 947         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 948                 if (argp->minorversion < 1)
 949                         goto xdr_error;
 950                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 951                 if (status)
 952                         return status;
 953                 break;
 954         default:
 955                 goto xdr_error;
 956         }
 957
 958         DECODE_TAIL;
 959 }
 960
 961 static __be32
 962 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 963 {
 964         DECODE_HEAD;
 965
 966         if (argp->minorversion >= 1)
 967                 return nfserr_notsupp;
 968
 969         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 970         if (status)
 971                 return status;
 972         READ_BUF(4);
 973         open_conf->oc_seqid = be32_to_cpup(p++);
 974
 975         DECODE_TAIL;
 976 }
 977
 978 static __be32
 979 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 980 {
 981         DECODE_HEAD;
 982
 983         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 984         if (status)
 985                 return status;
 986         READ_BUF(4);
 987         open_down->od_seqid = be32_to_cpup(p++);
 988         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 989                                            &open_down->od_deleg_want, NULL);
 990         if (status)
 991                 return status;
 992         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 993         if (status)
 994                 return status;
 995         DECODE_TAIL;
 996 }
 997
 998 static __be32
 999 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1000 {
1001         DECODE_HEAD;
1002
1003         READ_BUF(4);
1004         putfh->pf_fhlen = be32_to_cpup(p++);
1005         if (putfh->pf_fhlen > NFS4_FHSIZE)
1006                 goto xdr_error;
1007         READ_BUF(putfh->pf_fhlen);
1008         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1009
1010         DECODE_TAIL;
1011 }
1012
1013 static __be32
1014 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1015 {
1016         if (argp->minorversion == 0)
1017                 return nfs_ok;
1018         return nfserr_notsupp;
1019 }
1020
1021 static __be32
1022 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1023 {
1024         DECODE_HEAD;
1025
1026         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1027         if (status)
1028                 return status;
1029         READ_BUF(12);
1030         p = xdr_decode_hyper(p, &read->rd_offset);
1031         read->rd_length = be32_to_cpup(p++);
1032
1033         DECODE_TAIL;
1034 }
1035
1036 static __be32
1037 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1038 {
1039         DECODE_HEAD;
1040
1041         READ_BUF(24);
1042         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1043         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1044         readdir->rd_dircount = be32_to_cpup(p++);
1045         readdir->rd_maxcount = be32_to_cpup(p++);
1046         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1047                 goto out;
1048
1049         DECODE_TAIL;
1050 }
1051
1052 static __be32
1053 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1054 {
1055         DECODE_HEAD;
1056
1057         READ_BUF(4);
1058         remove->rm_namelen = be32_to_cpup(p++);
1059         READ_BUF(remove->rm_namelen);
1060         SAVEMEM(remove->rm_name, remove->rm_namelen);
1061         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1062                 return status;
1063
1064         DECODE_TAIL;
1065 }
1066
1067 static __be32
1068 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1069 {
1070         DECODE_HEAD;
1071
1072         READ_BUF(4);
1073         rename->rn_snamelen = be32_to_cpup(p++);
1074         READ_BUF(rename->rn_snamelen + 4);
1075         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1076         rename->rn_tnamelen = be32_to_cpup(p++);
1077         READ_BUF(rename->rn_tnamelen);
1078         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1079         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1080                 return status;
1081         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1082                 return status;
1083
1084         DECODE_TAIL;
1085 }
1086
1087 static __be32
1088 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1089 {
1090         DECODE_HEAD;
1091
1092         if (argp->minorversion >= 1)
1093                 return nfserr_notsupp;
1094
1095         READ_BUF(sizeof(clientid_t));
1096         COPYMEM(clientid, sizeof(clientid_t));
1097
1098         DECODE_TAIL;
1099 }
1100
1101 static __be32
1102 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1103                      struct nfsd4_secinfo *secinfo)
1104 {
1105         DECODE_HEAD;
1106
1107         READ_BUF(4);
1108         secinfo->si_namelen = be32_to_cpup(p++);
1109         READ_BUF(secinfo->si_namelen);
1110         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1111         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1112         if (status)
1113                 return status;
1114         DECODE_TAIL;
1115 }
1116
1117 static __be32
1118 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1119                      struct nfsd4_secinfo_no_name *sin)
1120 {
1121         DECODE_HEAD;
1122
1123         READ_BUF(4);
1124         sin->sin_style = be32_to_cpup(p++);
1125         DECODE_TAIL;
1126 }
1127
1128 static __be32
1129 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1130 {
1131         __be32 status;
1132
1133         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1134         if (status)
1135                 return status;
1136         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1137                                   &setattr->sa_acl, &setattr->sa_label);
1138 }
1139
1140 static __be32
1141 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1142 {
1143         DECODE_HEAD;
1144
1145         if (argp->minorversion >= 1)
1146                 return nfserr_notsupp;
1147
1148         READ_BUF(NFS4_VERIFIER_SIZE);
1149         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1150
1151         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1152         if (status)
1153                 return nfserr_bad_xdr;
1154         READ_BUF(8);
1155         setclientid->se_callback_prog = be32_to_cpup(p++);
1156         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1157
1158         READ_BUF(setclientid->se_callback_netid_len + 4);
1159         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1160         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1161
1162         READ_BUF(setclientid->se_callback_addr_len + 4);
1163         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1164         setclientid->se_callback_ident = be32_to_cpup(p++);
1165
1166         DECODE_TAIL;
1167 }
1168
1169 static __be32
1170 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1171 {
1172         DECODE_HEAD;
1173
1174         if (argp->minorversion >= 1)
1175                 return nfserr_notsupp;
1176
1177         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1178         COPYMEM(&scd_c->sc_clientid, 8);
1179         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1180
1181         DECODE_TAIL;
1182 }
1183
1184 /* Also used for NVERIFY */
1185 static __be32
1186 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1187 {
1188         DECODE_HEAD;
1189
1190         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1191                 goto out;
1192
1193         /* For convenience's sake, we compare raw xdr'd attributes in
1194          * nfsd4_proc_verify */
1195
1196         READ_BUF(4);
1197         verify->ve_attrlen = be32_to_cpup(p++);
1198         READ_BUF(verify->ve_attrlen);
1199         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1200
1201         DECODE_TAIL;
1202 }
1203
1204 static __be32
1205 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1206 {
1207         int avail;
1208         int len;
1209         DECODE_HEAD;
1210
1211         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1212         if (status)
1213                 return status;
1214         READ_BUF(16);
1215         p = xdr_decode_hyper(p, &write->wr_offset);
1216         write->wr_stable_how = be32_to_cpup(p++);
1217         if (write->wr_stable_how > 2)
1218                 goto xdr_error;
1219         write->wr_buflen = be32_to_cpup(p++);
1220
1221         /* Sorry .. no magic macros for this.. *
1222          * READ_BUF(write->wr_buflen);
1223          * SAVEMEM(write->wr_buf, write->wr_buflen);
1224          */
1225         avail = (char*)argp->end - (char*)argp->p;
1226         if (avail + argp->pagelen < write->wr_buflen) {
1227                 dprintk("NFSD: xdr error (%s:%d)\n",
1228                                 __FILE__, __LINE__);
1229                 goto xdr_error;
1230         }
1231         write->wr_head.iov_base = p;
1232         write->wr_head.iov_len = avail;
1233         write->wr_pagelist = argp->pagelist;
1234
1235         len = XDR_QUADLEN(write->wr_buflen) << 2;
1236         if (len >= avail) {
1237                 int pages;
1238
1239                 len -= avail;
1240
1241                 pages = len >> PAGE_SHIFT;
1242                 argp->pagelist += pages;
1243                 argp->pagelen -= pages * PAGE_SIZE;
1244                 len -= pages * PAGE_SIZE;
1245
1246                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1247                 argp->pagelist++;
1248                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1249         }
1250         argp->p += XDR_QUADLEN(len);
1251
1252         DECODE_TAIL;
1253 }
1254
1255 static __be32
1256 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1257 {
1258         DECODE_HEAD;
1259
1260         if (argp->minorversion >= 1)
1261                 return nfserr_notsupp;
1262
1263         READ_BUF(12);
1264         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1265         rlockowner->rl_owner.len = be32_to_cpup(p++);
1266         READ_BUF(rlockowner->rl_owner.len);
1267         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1268
1269         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1270                 return nfserr_inval;
1271         DECODE_TAIL;
1272 }
1273
1274 static __be32
1275 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1276                          struct nfsd4_exchange_id *exid)
1277 {
1278         int dummy, tmp;
1279         DECODE_HEAD;
1280
1281         READ_BUF(NFS4_VERIFIER_SIZE);
1282         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1283
1284         status = nfsd4_decode_opaque(argp, &exid->clname);
1285         if (status)
1286                 return nfserr_bad_xdr;
1287
1288         READ_BUF(4);
1289         exid->flags = be32_to_cpup(p++);
1290
1291         /* Ignore state_protect4_a */
1292         READ_BUF(4);
1293         exid->spa_how = be32_to_cpup(p++);
1294         switch (exid->spa_how) {
1295         case SP4_NONE:
1296                 break;
1297         case SP4_MACH_CRED:
1298                 /* spo_must_enforce */
1299                 READ_BUF(4);
1300                 dummy = be32_to_cpup(p++);
1301                 READ_BUF(dummy * 4);
1302                 p += dummy;
1303
1304                 /* spo_must_allow */
1305                 READ_BUF(4);
1306                 dummy = be32_to_cpup(p++);
1307                 READ_BUF(dummy * 4);
1308                 p += dummy;
1309                 break;
1310         case SP4_SSV:
1311                 /* ssp_ops */
1312                 READ_BUF(4);
1313                 dummy = be32_to_cpup(p++);
1314                 READ_BUF(dummy * 4);
1315                 p += dummy;
1316
1317                 READ_BUF(4);
1318                 dummy = be32_to_cpup(p++);
1319                 READ_BUF(dummy * 4);
1320                 p += dummy;
1321
1322                 /* ssp_hash_algs<> */
1323                 READ_BUF(4);
1324                 tmp = be32_to_cpup(p++);
1325                 while (tmp--) {
1326                         READ_BUF(4);
1327                         dummy = be32_to_cpup(p++);
1328                         READ_BUF(dummy);
1329                         p += XDR_QUADLEN(dummy);
1330                 }
1331
1332                 /* ssp_encr_algs<> */
1333                 READ_BUF(4);
1334                 tmp = be32_to_cpup(p++);
1335                 while (tmp--) {
1336                         READ_BUF(4);
1337                         dummy = be32_to_cpup(p++);
1338                         READ_BUF(dummy);
1339                         p += XDR_QUADLEN(dummy);
1340                 }
1341
1342                 /* ssp_window and ssp_num_gss_handles */
1343                 READ_BUF(8);
1344                 dummy = be32_to_cpup(p++);
1345                 dummy = be32_to_cpup(p++);
1346                 break;
1347         default:
1348                 goto xdr_error;
1349         }
1350
1351         /* Ignore Implementation ID */
1352         READ_BUF(4);    /* nfs_impl_id4 array length */
1353         dummy = be32_to_cpup(p++);
1354
1355         if (dummy > 1)
1356                 goto xdr_error;
1357
1358         if (dummy == 1) {
1359                 /* nii_domain */
1360                 READ_BUF(4);
1361                 dummy = be32_to_cpup(p++);
1362                 READ_BUF(dummy);
1363                 p += XDR_QUADLEN(dummy);
1364
1365                 /* nii_name */
1366                 READ_BUF(4);
1367                 dummy = be32_to_cpup(p++);
1368                 READ_BUF(dummy);
1369                 p += XDR_QUADLEN(dummy);
1370
1371                 /* nii_date */
1372                 READ_BUF(12);
1373                 p += 3;
1374         }
1375         DECODE_TAIL;
1376 }
1377
1378 static __be32
1379 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1380                             struct nfsd4_create_session *sess)
1381 {
1382         DECODE_HEAD;
1383         u32 dummy;
1384
1385         READ_BUF(16);
1386         COPYMEM(&sess->clientid, 8);
1387         sess->seqid = be32_to_cpup(p++);
1388         sess->flags = be32_to_cpup(p++);
1389
1390         /* Fore channel attrs */
1391         READ_BUF(28);
1392         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1393         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1394         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1395         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1396         sess->fore_channel.maxops = be32_to_cpup(p++);
1397         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1398         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1399         if (sess->fore_channel.nr_rdma_attrs == 1) {
1400                 READ_BUF(4);
1401                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1402         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1403                 dprintk("Too many fore channel attr bitmaps!\n");
1404                 goto xdr_error;
1405         }
1406
1407         /* Back channel attrs */
1408         READ_BUF(28);
1409         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1410         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1411         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1412         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1413         sess->back_channel.maxops = be32_to_cpup(p++);
1414         sess->back_channel.maxreqs = be32_to_cpup(p++);
1415         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1416         if (sess->back_channel.nr_rdma_attrs == 1) {
1417                 READ_BUF(4);
1418                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1419         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1420                 dprintk("Too many back channel attr bitmaps!\n");
1421                 goto xdr_error;
1422         }
1423
1424         READ_BUF(4);
1425         sess->callback_prog = be32_to_cpup(p++);
1426         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1427         DECODE_TAIL;
1428 }
1429
1430 static __be32
1431 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1432                              struct nfsd4_destroy_session *destroy_session)
1433 {
1434         DECODE_HEAD;
1435         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1436         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1437
1438         DECODE_TAIL;
1439 }
1440
1441 static __be32
1442 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1443                           struct nfsd4_free_stateid *free_stateid)
1444 {
1445         DECODE_HEAD;
1446
1447         READ_BUF(sizeof(stateid_t));
1448         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1449         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1450
1451         DECODE_TAIL;
1452 }
1453
1454 static __be32
1455 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1456                       struct nfsd4_sequence *seq)
1457 {
1458         DECODE_HEAD;
1459
1460         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1461         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1462         seq->seqid = be32_to_cpup(p++);
1463         seq->slotid = be32_to_cpup(p++);
1464         seq->maxslots = be32_to_cpup(p++);
1465         seq->cachethis = be32_to_cpup(p++);
1466
1467         DECODE_TAIL;
1468 }
1469
1470 static __be32
1471 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1472 {
1473         int i;
1474         __be32 *p, status;
1475         struct nfsd4_test_stateid_id *stateid;
1476
1477         READ_BUF(4);
1478         test_stateid->ts_num_ids = ntohl(*p++);
1479
1480         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1481
1482         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1483                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1484                 if (!stateid) {
1485                         status = nfserrno(-ENOMEM);
1486                         goto out;
1487                 }
1488
1489                 INIT_LIST_HEAD(&stateid->ts_id_list);
1490                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1491
1492                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1493                 if (status)
1494                         goto out;
1495         }
1496
1497         status = 0;
1498 out:
1499         return status;
1500 xdr_error:
1501         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1502         status = nfserr_bad_xdr;
1503         goto out;
1504 }
1505
1506 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1507 {
1508         DECODE_HEAD;
1509
1510         READ_BUF(8);
1511         COPYMEM(&dc->clientid, 8);
1512
1513         DECODE_TAIL;
1514 }
1515
1516 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1517 {
1518         DECODE_HEAD;
1519
1520         READ_BUF(4);
1521         rc->rca_one_fs = be32_to_cpup(p++);
1522
1523         DECODE_TAIL;
1524 }
1525
1526 #ifdef CONFIG_NFSD_PNFS
1527 static __be32
1528 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1529                 struct nfsd4_getdeviceinfo *gdev)
1530 {
1531         DECODE_HEAD;
1532         u32 num, i;
1533
1534         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1535         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1536         gdev->gd_layout_type = be32_to_cpup(p++);
1537         gdev->gd_maxcount = be32_to_cpup(p++);
1538         num = be32_to_cpup(p++);
1539         if (num) {
1540                 READ_BUF(4 * num);
1541                 gdev->gd_notify_types = be32_to_cpup(p++);
1542                 for (i = 1; i < num; i++) {
1543                         if (be32_to_cpup(p++)) {
1544                                 status = nfserr_inval;
1545                                 goto out;
1546                         }
1547                 }
1548         }
1549         DECODE_TAIL;
1550 }
1551
1552 static __be32
1553 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1554                 struct nfsd4_layoutget *lgp)
1555 {
1556         DECODE_HEAD;
1557
1558         READ_BUF(36);
1559         lgp->lg_signal = be32_to_cpup(p++);
1560         lgp->lg_layout_type = be32_to_cpup(p++);
1561         lgp->lg_seg.iomode = be32_to_cpup(p++);
1562         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1563         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1564         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1565
1566         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1567         if (status)
1568                 return status;
1569
1570         READ_BUF(4);
1571         lgp->lg_maxcount = be32_to_cpup(p++);
1572
1573         DECODE_TAIL;
1574 }
1575
1576 static __be32
1577 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1578                 struct nfsd4_layoutcommit *lcp)
1579 {
1580         DECODE_HEAD;
1581         u32 timechange;
1582
1583         READ_BUF(20);
1584         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1585         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1586         lcp->lc_reclaim = be32_to_cpup(p++);
1587
1588         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1589         if (status)
1590                 return status;
1591
1592         READ_BUF(4);
1593         lcp->lc_newoffset = be32_to_cpup(p++);
1594         if (lcp->lc_newoffset) {
1595                 READ_BUF(8);
1596                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1597         } else
1598                 lcp->lc_last_wr = 0;
1599         READ_BUF(4);
1600         timechange = be32_to_cpup(p++);
1601         if (timechange) {
1602                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1603                 if (status)
1604                         return status;
1605         } else {
1606                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1607         }
1608         READ_BUF(8);
1609         lcp->lc_layout_type = be32_to_cpup(p++);
1610
1611         /*
1612          * Save the layout update in XDR format and let the layout driver deal
1613          * with it later.
1614          */
1615         lcp->lc_up_len = be32_to_cpup(p++);
1616         if (lcp->lc_up_len > 0) {
1617                 READ_BUF(lcp->lc_up_len);
1618                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1619         }
1620
1621         DECODE_TAIL;
1622 }
1623
1624 static __be32
1625 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1626                 struct nfsd4_layoutreturn *lrp)
1627 {
1628         DECODE_HEAD;
1629
1630         READ_BUF(16);
1631         lrp->lr_reclaim = be32_to_cpup(p++);
1632         lrp->lr_layout_type = be32_to_cpup(p++);
1633         lrp->lr_seg.iomode = be32_to_cpup(p++);
1634         lrp->lr_return_type = be32_to_cpup(p++);
1635         if (lrp->lr_return_type == RETURN_FILE) {
1636                 READ_BUF(16);
1637                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1638                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1639
1640                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1641                 if (status)
1642                         return status;
1643
1644                 READ_BUF(4);
1645                 lrp->lrf_body_len = be32_to_cpup(p++);
1646                 if (lrp->lrf_body_len > 0) {
1647                         READ_BUF(lrp->lrf_body_len);
1648                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1649                 }
1650         } else {
1651                 lrp->lr_seg.offset = 0;
1652                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1653         }
1654
1655         DECODE_TAIL;
1656 }
1657 #endif /* CONFIG_NFSD_PNFS */
1658
1659 static __be32
1660 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1661                        struct nfsd4_fallocate *fallocate)
1662 {
1663         DECODE_HEAD;
1664
1665         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1666         if (status)
1667                 return status;
1668
1669         READ_BUF(16);
1670         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1671         xdr_decode_hyper(p, &fallocate->falloc_length);
1672
1673         DECODE_TAIL;
1674 }
1675
1676 static __be32
1677 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1678 {
1679         DECODE_HEAD;
1680
1681         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1682         if (status)
1683                 return status;
1684
1685         READ_BUF(8 + 4);
1686         p = xdr_decode_hyper(p, &seek->seek_offset);
1687         seek->seek_whence = be32_to_cpup(p);
1688
1689         DECODE_TAIL;
1690 }
1691
1692 static __be32
1693 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1694 {
1695         return nfs_ok;
1696 }
1697
1698 static __be32
1699 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1700 {
1701         return nfserr_notsupp;
1702 }
1703
1704 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1705
1706 static nfsd4_dec nfsd4_dec_ops[] = {
1707         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1708         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1709         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1710         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1711         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1712         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1713         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1714         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1715         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1716         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1717         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1718         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1719         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1720         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1721         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1722         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1723         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1724         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1725         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1726         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1727         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1728         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1729         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1730         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1731         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1732         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1733         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1734         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1735         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1736         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1737         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1738         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1739         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1740         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1741         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1742         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1743         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1744
1745         /* new operations for NFSv4.1 */
1746         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1747         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1748         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1749         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1750         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1751         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1752         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1753 #ifdef CONFIG_NFSD_PNFS
1754         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1755         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1756         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1757         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1758         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1759 #else
1760         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1761         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1762         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1763         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1764         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1765 #endif
1766         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1767         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1768         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1769         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1770         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1771         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1772         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1773
1774         /* new operations for NFSv4.2 */
1775         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1776         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_notsupp,
1777         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1778         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1779         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1780         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1781         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1782         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1783         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1784         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1785         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1786         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1787 };
1788
1789 static inline bool
1790 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1791 {
1792         if (op->opnum < FIRST_NFS4_OP)
1793                 return false;
1794         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1795                 return false;
1796         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1797                 return false;
1798         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1799                 return false;
1800         return true;
1801 }
1802
1803 static __be32
1804 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1805 {
1806         DECODE_HEAD;
1807         struct nfsd4_op *op;
1808         bool cachethis = false;
1809         int auth_slack= argp->rqstp->rq_auth_slack;
1810         int max_reply = auth_slack + 8; /* opcnt, status */
1811         int readcount = 0;
1812         int readbytes = 0;
1813         int i;
1814
1815         READ_BUF(4);
1816         argp->taglen = be32_to_cpup(p++);
1817         READ_BUF(argp->taglen + 8);
1818         SAVEMEM(argp->tag, argp->taglen);
1819         argp->minorversion = be32_to_cpup(p++);
1820         argp->opcnt = be32_to_cpup(p++);
1821         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1822
1823         if (argp->taglen > NFSD4_MAX_TAGLEN)
1824                 goto xdr_error;
1825         if (argp->opcnt > 100)
1826                 goto xdr_error;
1827
1828         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1829                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1830                 if (!argp->ops) {
1831                         argp->ops = argp->iops;
1832                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1833                         goto xdr_error;
1834                 }
1835         }
1836
1837         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1838                 argp->opcnt = 0;
1839
1840         for (i = 0; i < argp->opcnt; i++) {
1841                 op = &argp->ops[i];
1842                 op->replay = NULL;
1843
1844                 READ_BUF(4);
1845                 op->opnum = be32_to_cpup(p++);
1846
1847                 if (nfsd4_opnum_in_range(argp, op))
1848                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1849                 else {
1850                         op->opnum = OP_ILLEGAL;
1851                         op->status = nfserr_op_illegal;
1852                 }
1853                 /*
1854                  * We'll try to cache the result in the DRC if any one
1855                  * op in the compound wants to be cached:
1856                  */
1857                 cachethis |= nfsd4_cache_this_op(op);
1858
1859                 if (op->opnum == OP_READ) {
1860                         readcount++;
1861                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1862                 } else
1863                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1864                 /*
1865                  * OP_LOCK may return a conflicting lock.  (Special case
1866                  * because it will just skip encoding this if it runs
1867                  * out of xdr buffer space, and it is the only operation
1868                  * that behaves this way.)
1869                  */
1870                 if (op->opnum == OP_LOCK)
1871                         max_reply += NFS4_OPAQUE_LIMIT;
1872
1873                 if (op->status) {
1874                         argp->opcnt = i+1;
1875                         break;
1876                 }
1877         }
1878         /* Sessions make the DRC unnecessary: */
1879         if (argp->minorversion)
1880                 cachethis = false;
1881         svc_reserve(argp->rqstp, max_reply + readbytes);
1882         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1883
1884         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1885                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1886
1887         DECODE_TAIL;
1888 }
1889
1890 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1891 {
1892         if (IS_I_VERSION(inode)) {
1893                 p = xdr_encode_hyper(p, inode->i_version);
1894         } else {
1895                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1896                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1897         }
1898         return p;
1899 }
1900
1901 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1902 {
1903         *p++ = cpu_to_be32(c->atomic);
1904         if (c->change_supported) {
1905                 p = xdr_encode_hyper(p, c->before_change);
1906                 p = xdr_encode_hyper(p, c->after_change);
1907         } else {
1908                 *p++ = cpu_to_be32(c->before_ctime_sec);
1909                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1910                 *p++ = cpu_to_be32(c->after_ctime_sec);
1911                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1912         }
1913         return p;
1914 }
1915
1916 /* Encode as an array of strings the string given with components
1917  * separated @sep, escaped with esc_enter and esc_exit.
1918  */
1919 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1920                                           char *components, char esc_enter,
1921                                           char esc_exit)
1922 {
1923         __be32 *p;
1924         __be32 pathlen;
1925         int pathlen_offset;
1926         int strlen, count=0;
1927         char *str, *end, *next;
1928
1929         dprintk("nfsd4_encode_components(%s)\n", components);
1930
1931         pathlen_offset = xdr->buf->len;
1932         p = xdr_reserve_space(xdr, 4);
1933         if (!p)
1934                 return nfserr_resource;
1935         p++; /* We will fill this in with @count later */
1936
1937         end = str = components;
1938         while (*end) {
1939                 bool found_esc = false;
1940
1941                 /* try to parse as esc_start, ..., esc_end, sep */
1942                 if (*str == esc_enter) {
1943                         for (; *end && (*end != esc_exit); end++)
1944                                 /* find esc_exit or end of string */;
1945                         next = end + 1;
1946                         if (*end && (!*next || *next == sep)) {
1947                                 str++;
1948                                 found_esc = true;
1949                         }
1950                 }
1951
1952                 if (!found_esc)
1953                         for (; *end && (*end != sep); end++)
1954                                 /* find sep or end of string */;
1955
1956                 strlen = end - str;
1957                 if (strlen) {
1958                         p = xdr_reserve_space(xdr, strlen + 4);
1959                         if (!p)
1960                                 return nfserr_resource;
1961                         p = xdr_encode_opaque(p, str, strlen);
1962                         count++;
1963                 }
1964                 else
1965                         end++;
1966                 if (found_esc)
1967                         end = next;
1968
1969                 str = end;
1970         }
1971         pathlen = htonl(count);
1972         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1973         return 0;
1974 }
1975
1976 /* Encode as an array of strings the string given with components
1977  * separated @sep.
1978  */
1979 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1980                                       char *components)
1981 {
1982         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1983 }
1984
1985 /*
1986  * encode a location element of a fs_locations structure
1987  */
1988 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1989                                         struct nfsd4_fs_location *location)
1990 {
1991         __be32 status;
1992
1993         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1994                                                 '[', ']');
1995         if (status)
1996                 return status;
1997         status = nfsd4_encode_components(xdr, '/', location->path);
1998         if (status)
1999                 return status;
2000         return 0;
2001 }
2002
2003 /*
2004  * Encode a path in RFC3530 'pathname4' format
2005  */
2006 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2007                                 const struct path *root,
2008                                 const struct path *path)
2009 {
2010         struct path cur = *path;
2011         __be32 *p;
2012         struct dentry **components = NULL;
2013         unsigned int ncomponents = 0;
2014         __be32 err = nfserr_jukebox;
2015
2016         dprintk("nfsd4_encode_components(");
2017
2018         path_get(&cur);
2019         /* First walk the path up to the nfsd root, and store the
2020          * dentries/path components in an array.
2021          */
2022         for (;;) {
2023                 if (path_equal(&cur, root))
2024                         break;
2025                 if (cur.dentry == cur.mnt->mnt_root) {
2026                         if (follow_up(&cur))
2027                                 continue;
2028                         goto out_free;
2029                 }
2030                 if ((ncomponents & 15) == 0) {
2031                         struct dentry **new;
2032                         new = krealloc(components,
2033                                         sizeof(*new) * (ncomponents + 16),
2034                                         GFP_KERNEL);
2035                         if (!new)
2036                                 goto out_free;
2037                         components = new;
2038                 }
2039                 components[ncomponents++] = cur.dentry;
2040                 cur.dentry = dget_parent(cur.dentry);
2041         }
2042         err = nfserr_resource;
2043         p = xdr_reserve_space(xdr, 4);
2044         if (!p)
2045                 goto out_free;
2046         *p++ = cpu_to_be32(ncomponents);
2047
2048         while (ncomponents) {
2049                 struct dentry *dentry = components[ncomponents - 1];
2050                 unsigned int len;
2051
2052                 spin_lock(&dentry->d_lock);
2053                 len = dentry->d_name.len;
2054                 p = xdr_reserve_space(xdr, len + 4);
2055                 if (!p) {
2056                         spin_unlock(&dentry->d_lock);
2057                         goto out_free;
2058                 }
2059                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2060                 dprintk("/%pd", dentry);
2061                 spin_unlock(&dentry->d_lock);
2062                 dput(dentry);
2063                 ncomponents--;
2064         }
2065
2066         err = 0;
2067 out_free:
2068         dprintk(")\n");
2069         while (ncomponents)
2070                 dput(components[--ncomponents]);
2071         kfree(components);
2072         path_put(&cur);
2073         return err;
2074 }
2075
2076 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2077                         struct svc_rqst *rqstp, const struct path *path)
2078 {
2079         struct svc_export *exp_ps;
2080         __be32 res;
2081
2082         exp_ps = rqst_find_fsidzero_export(rqstp);
2083         if (IS_ERR(exp_ps))
2084                 return nfserrno(PTR_ERR(exp_ps));
2085         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2086         exp_put(exp_ps);
2087         return res;
2088 }
2089
2090 /*
2091  *  encode a fs_locations structure
2092  */
2093 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2094                         struct svc_rqst *rqstp, struct svc_export *exp)
2095 {
2096         __be32 status;
2097         int i;
2098         __be32 *p;
2099         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2100
2101         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2102         if (status)
2103                 return status;
2104         p = xdr_reserve_space(xdr, 4);
2105         if (!p)
2106                 return nfserr_resource;
2107         *p++ = cpu_to_be32(fslocs->locations_count);
2108         for (i=0; i<fslocs->locations_count; i++) {
2109                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2110                 if (status)
2111                         return status;
2112         }
2113         return 0;
2114 }
2115
2116 static u32 nfs4_file_type(umode_t mode)
2117 {
2118         switch (mode & S_IFMT) {
2119         case S_IFIFO:   return NF4FIFO;
2120         case S_IFCHR:   return NF4CHR;
2121         case S_IFDIR:   return NF4DIR;
2122         case S_IFBLK:   return NF4BLK;
2123         case S_IFLNK:   return NF4LNK;
2124         case S_IFREG:   return NF4REG;
2125         case S_IFSOCK:  return NF4SOCK;
2126         default:        return NF4BAD;
2127         };
2128 }
2129
2130 static inline __be32
2131 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2132                      struct nfs4_ace *ace)
2133 {
2134         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2135                 return nfs4_acl_write_who(xdr, ace->whotype);
2136         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2137                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2138         else
2139                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2140 }
2141
2142 static inline __be32
2143 nfsd4_encode_layout_type(struct xdr_stream *xdr, enum pnfs_layouttype layout_type)
2144 {
2145         __be32 *p;
2146
2147         if (layout_type) {
2148                 p = xdr_reserve_space(xdr, 8);
2149                 if (!p)
2150                         return nfserr_resource;
2151                 *p++ = cpu_to_be32(1);
2152                 *p++ = cpu_to_be32(layout_type);
2153         } else {
2154                 p = xdr_reserve_space(xdr, 4);
2155                 if (!p)
2156                         return nfserr_resource;
2157                 *p++ = cpu_to_be32(0);
2158         }
2159
2160         return 0;
2161 }
2162
2163 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2164                               FATTR4_WORD0_RDATTR_ERROR)
2165 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2166 #define WORD2_ABSENT_FS_ATTRS 0
2167
2168 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2169 static inline __be32
2170 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2171                             void *context, int len)
2172 {
2173         __be32 *p;
2174
2175         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2176         if (!p)
2177                 return nfserr_resource;
2178
2179         /*
2180          * For now we use a 0 here to indicate the null translation; in
2181          * the future we may place a call to translation code here.
2182          */
2183         *p++ = cpu_to_be32(0); /* lfs */
2184         *p++ = cpu_to_be32(0); /* pi */
2185         p = xdr_encode_opaque(p, context, len);
2186         return 0;
2187 }
2188 #else
2189 static inline __be32
2190 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2191                             void *context, int len)
2192 { return 0; }
2193 #endif
2194
2195 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2196 {
2197         /* As per referral draft:  */
2198         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2199             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2200                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2201                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2202                         *rdattr_err = NFSERR_MOVED;
2203                 else
2204                         return nfserr_moved;
2205         }
2206         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2207         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2208         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2209         return 0;
2210 }
2211
2212
2213 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2214 {
2215         struct path path = exp->ex_path;
2216         int err;
2217
2218         path_get(&path);
2219         while (follow_up(&path)) {
2220                 if (path.dentry != path.mnt->mnt_root)
2221                         break;
2222         }
2223         err = vfs_getattr(&path, stat);
2224         path_put(&path);
2225         return err;
2226 }
2227
2228 /*
2229  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2230  * ourselves.
2231  */
2232 static __be32
2233 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2234                 struct svc_export *exp,
2235                 struct dentry *dentry, u32 *bmval,
2236                 struct svc_rqst *rqstp, int ignore_crossmnt)
2237 {
2238         u32 bmval0 = bmval[0];
2239         u32 bmval1 = bmval[1];
2240         u32 bmval2 = bmval[2];
2241         struct kstat stat;
2242         struct svc_fh *tempfh = NULL;
2243         struct kstatfs statfs;
2244         __be32 *p;
2245         int starting_len = xdr->buf->len;
2246         int attrlen_offset;
2247         __be32 attrlen;
2248         u32 dummy;
2249         u64 dummy64;
2250         u32 rdattr_err = 0;
2251         __be32 status;
2252         int err;
2253         int aclsupport = 0;
2254         struct nfs4_acl *acl = NULL;
2255         void *context = NULL;
2256         int contextlen;
2257         bool contextsupport = false;
2258         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2259         u32 minorversion = resp->cstate.minorversion;
2260         struct path path = {
2261                 .mnt    = exp->ex_path.mnt,
2262                 .dentry = dentry,
2263         };
2264         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2265
2266         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2267         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2268         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2269         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2270
2271         if (exp->ex_fslocs.migrated) {
2272                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2273                 if (status)
2274                         goto out;
2275         }
2276
2277         err = vfs_getattr(&path, &stat);
2278         if (err)
2279                 goto out_nfserr;
2280         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2281                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2282             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2283                        FATTR4_WORD1_SPACE_TOTAL))) {
2284                 err = vfs_statfs(&path, &statfs);
2285                 if (err)
2286                         goto out_nfserr;
2287         }
2288         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2289                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2290                 status = nfserr_jukebox;
2291                 if (!tempfh)
2292                         goto out;
2293                 fh_init(tempfh, NFS4_FHSIZE);
2294                 status = fh_compose(tempfh, exp, dentry, NULL);
2295                 if (status)
2296                         goto out;
2297                 fhp = tempfh;
2298         }
2299         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2300                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2301                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2302                 aclsupport = (err == 0);
2303                 if (bmval0 & FATTR4_WORD0_ACL) {
2304                         if (err == -EOPNOTSUPP)
2305                                 bmval0 &= ~FATTR4_WORD0_ACL;
2306                         else if (err == -EINVAL) {
2307                                 status = nfserr_attrnotsupp;
2308                                 goto out;
2309                         } else if (err != 0)
2310                                 goto out_nfserr;
2311                 }
2312         }
2313
2314 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2315         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2316              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2317                 err = security_inode_getsecctx(d_inode(dentry),
2318                                                 &context, &contextlen);
2319                 contextsupport = (err == 0);
2320                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2321                         if (err == -EOPNOTSUPP)
2322                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2323                         else if (err)
2324                                 goto out_nfserr;
2325                 }
2326         }
2327 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2328
2329         if (bmval2) {
2330                 p = xdr_reserve_space(xdr, 16);
2331                 if (!p)
2332                         goto out_resource;
2333                 *p++ = cpu_to_be32(3);
2334                 *p++ = cpu_to_be32(bmval0);
2335                 *p++ = cpu_to_be32(bmval1);
2336                 *p++ = cpu_to_be32(bmval2);
2337         } else if (bmval1) {
2338                 p = xdr_reserve_space(xdr, 12);
2339                 if (!p)
2340                         goto out_resource;
2341                 *p++ = cpu_to_be32(2);
2342                 *p++ = cpu_to_be32(bmval0);
2343                 *p++ = cpu_to_be32(bmval1);
2344         } else {
2345                 p = xdr_reserve_space(xdr, 8);
2346                 if (!p)
2347                         goto out_resource;
2348                 *p++ = cpu_to_be32(1);
2349                 *p++ = cpu_to_be32(bmval0);
2350         }
2351
2352         attrlen_offset = xdr->buf->len;
2353         p = xdr_reserve_space(xdr, 4);
2354         if (!p)
2355                 goto out_resource;
2356         p++;                /* to be backfilled later */
2357
2358         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2359                 u32 word0 = nfsd_suppattrs0(minorversion);
2360                 u32 word1 = nfsd_suppattrs1(minorversion);
2361                 u32 word2 = nfsd_suppattrs2(minorversion);
2362
2363                 if (!aclsupport)
2364                         word0 &= ~FATTR4_WORD0_ACL;
2365                 if (!contextsupport)
2366                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2367                 if (!word2) {
2368                         p = xdr_reserve_space(xdr, 12);
2369                         if (!p)
2370                                 goto out_resource;
2371                         *p++ = cpu_to_be32(2);
2372                         *p++ = cpu_to_be32(word0);
2373                         *p++ = cpu_to_be32(word1);
2374                 } else {
2375                         p = xdr_reserve_space(xdr, 16);
2376                         if (!p)
2377                                 goto out_resource;
2378                         *p++ = cpu_to_be32(3);
2379                         *p++ = cpu_to_be32(word0);
2380                         *p++ = cpu_to_be32(word1);
2381                         *p++ = cpu_to_be32(word2);
2382                 }
2383         }
2384         if (bmval0 & FATTR4_WORD0_TYPE) {
2385                 p = xdr_reserve_space(xdr, 4);
2386                 if (!p)
2387                         goto out_resource;
2388                 dummy = nfs4_file_type(stat.mode);
2389                 if (dummy == NF4BAD) {
2390                         status = nfserr_serverfault;
2391                         goto out;
2392                 }
2393                 *p++ = cpu_to_be32(dummy);
2394         }
2395         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2396                 p = xdr_reserve_space(xdr, 4);
2397                 if (!p)
2398                         goto out_resource;
2399                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2400                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2401                 else
2402                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2403                                                 NFS4_FH_VOL_RENAME);
2404         }
2405         if (bmval0 & FATTR4_WORD0_CHANGE) {
2406                 p = xdr_reserve_space(xdr, 8);
2407                 if (!p)
2408                         goto out_resource;
2409                 p = encode_change(p, &stat, d_inode(dentry));
2410         }
2411         if (bmval0 & FATTR4_WORD0_SIZE) {
2412                 p = xdr_reserve_space(xdr, 8);
2413                 if (!p)
2414                         goto out_resource;
2415                 p = xdr_encode_hyper(p, stat.size);
2416         }
2417         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2418                 p = xdr_reserve_space(xdr, 4);
2419                 if (!p)
2420                         goto out_resource;
2421                 *p++ = cpu_to_be32(1);
2422         }
2423         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2424                 p = xdr_reserve_space(xdr, 4);
2425                 if (!p)
2426                         goto out_resource;
2427                 *p++ = cpu_to_be32(1);
2428         }
2429         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2430                 p = xdr_reserve_space(xdr, 4);
2431                 if (!p)
2432                         goto out_resource;
2433                 *p++ = cpu_to_be32(0);
2434         }
2435         if (bmval0 & FATTR4_WORD0_FSID) {
2436                 p = xdr_reserve_space(xdr, 16);
2437                 if (!p)
2438                         goto out_resource;
2439                 if (exp->ex_fslocs.migrated) {
2440                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2441                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2442                 } else switch(fsid_source(fhp)) {
2443                 case FSIDSOURCE_FSID:
2444                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2445                         p = xdr_encode_hyper(p, (u64)0);
2446                         break;
2447                 case FSIDSOURCE_DEV:
2448                         *p++ = cpu_to_be32(0);
2449                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2450                         *p++ = cpu_to_be32(0);
2451                         *p++ = cpu_to_be32(MINOR(stat.dev));
2452                         break;
2453                 case FSIDSOURCE_UUID:
2454                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2455                                                                 EX_UUID_LEN);
2456                         break;
2457                 }
2458         }
2459         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2460                 p = xdr_reserve_space(xdr, 4);
2461                 if (!p)
2462                         goto out_resource;
2463                 *p++ = cpu_to_be32(0);
2464         }
2465         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2466                 p = xdr_reserve_space(xdr, 4);
2467                 if (!p)
2468                         goto out_resource;
2469                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2470         }
2471         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2472                 p = xdr_reserve_space(xdr, 4);
2473                 if (!p)
2474                         goto out_resource;
2475                 *p++ = cpu_to_be32(rdattr_err);
2476         }
2477         if (bmval0 & FATTR4_WORD0_ACL) {
2478                 struct nfs4_ace *ace;
2479
2480                 if (acl == NULL) {
2481                         p = xdr_reserve_space(xdr, 4);
2482                         if (!p)
2483                                 goto out_resource;
2484
2485                         *p++ = cpu_to_be32(0);
2486                         goto out_acl;
2487                 }
2488                 p = xdr_reserve_space(xdr, 4);
2489                 if (!p)
2490                         goto out_resource;
2491                 *p++ = cpu_to_be32(acl->naces);
2492
2493                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2494                         p = xdr_reserve_space(xdr, 4*3);
2495                         if (!p)
2496                                 goto out_resource;
2497                         *p++ = cpu_to_be32(ace->type);
2498                         *p++ = cpu_to_be32(ace->flag);
2499                         *p++ = cpu_to_be32(ace->access_mask &
2500                                                         NFS4_ACE_MASK_ALL);
2501                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2502                         if (status)
2503                                 goto out;
2504                 }
2505         }
2506 out_acl:
2507         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2508                 p = xdr_reserve_space(xdr, 4);
2509                 if (!p)
2510                         goto out_resource;
2511                 *p++ = cpu_to_be32(aclsupport ?
2512                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2513         }
2514         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2515                 p = xdr_reserve_space(xdr, 4);
2516                 if (!p)
2517                         goto out_resource;
2518                 *p++ = cpu_to_be32(1);
2519         }
2520         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2521                 p = xdr_reserve_space(xdr, 4);
2522                 if (!p)
2523                         goto out_resource;
2524                 *p++ = cpu_to_be32(0);
2525         }
2526         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2527                 p = xdr_reserve_space(xdr, 4);
2528                 if (!p)
2529                         goto out_resource;
2530                 *p++ = cpu_to_be32(1);
2531         }
2532         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2533                 p = xdr_reserve_space(xdr, 4);
2534                 if (!p)
2535                         goto out_resource;
2536                 *p++ = cpu_to_be32(1);
2537         }
2538         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2539                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2540                 if (!p)
2541                         goto out_resource;
2542                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2543                                         fhp->fh_handle.fh_size);
2544         }
2545         if (bmval0 & FATTR4_WORD0_FILEID) {
2546                 p = xdr_reserve_space(xdr, 8);
2547                 if (!p)
2548                         goto out_resource;
2549                 p = xdr_encode_hyper(p, stat.ino);
2550         }
2551         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2552                 p = xdr_reserve_space(xdr, 8);
2553                 if (!p)
2554                         goto out_resource;
2555                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2556         }
2557         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2558                 p = xdr_reserve_space(xdr, 8);
2559                 if (!p)
2560                         goto out_resource;
2561                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2562         }
2563         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2564                 p = xdr_reserve_space(xdr, 8);
2565                 if (!p)
2566                         goto out_resource;
2567                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2568         }
2569         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2570                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2571                 if (status)
2572                         goto out;
2573         }
2574         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2575                 p = xdr_reserve_space(xdr, 4);
2576                 if (!p)
2577                         goto out_resource;
2578                 *p++ = cpu_to_be32(1);
2579         }
2580         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2581                 p = xdr_reserve_space(xdr, 8);
2582                 if (!p)
2583                         goto out_resource;
2584                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2585         }
2586         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2587                 p = xdr_reserve_space(xdr, 4);
2588                 if (!p)
2589                         goto out_resource;
2590                 *p++ = cpu_to_be32(255);
2591         }
2592         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2593                 p = xdr_reserve_space(xdr, 4);
2594                 if (!p)
2595                         goto out_resource;
2596                 *p++ = cpu_to_be32(statfs.f_namelen);
2597         }
2598         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2599                 p = xdr_reserve_space(xdr, 8);
2600                 if (!p)
2601                         goto out_resource;
2602                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2603         }
2604         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2605                 p = xdr_reserve_space(xdr, 8);
2606                 if (!p)
2607                         goto out_resource;
2608                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2609         }
2610         if (bmval1 & FATTR4_WORD1_MODE) {
2611                 p = xdr_reserve_space(xdr, 4);
2612                 if (!p)
2613                         goto out_resource;
2614                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2615         }
2616         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2617                 p = xdr_reserve_space(xdr, 4);
2618                 if (!p)
2619                         goto out_resource;
2620                 *p++ = cpu_to_be32(1);
2621         }
2622         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2623                 p = xdr_reserve_space(xdr, 4);
2624                 if (!p)
2625                         goto out_resource;
2626                 *p++ = cpu_to_be32(stat.nlink);
2627         }
2628         if (bmval1 & FATTR4_WORD1_OWNER) {
2629                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2630                 if (status)
2631                         goto out;
2632         }
2633         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2634                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2635                 if (status)
2636                         goto out;
2637         }
2638         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2639                 p = xdr_reserve_space(xdr, 8);
2640                 if (!p)
2641                         goto out_resource;
2642                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2643                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2644         }
2645         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2646                 p = xdr_reserve_space(xdr, 8);
2647                 if (!p)
2648                         goto out_resource;
2649                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2650                 p = xdr_encode_hyper(p, dummy64);
2651         }
2652         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2653                 p = xdr_reserve_space(xdr, 8);
2654                 if (!p)
2655                         goto out_resource;
2656                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2657                 p = xdr_encode_hyper(p, dummy64);
2658         }
2659         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2660                 p = xdr_reserve_space(xdr, 8);
2661                 if (!p)
2662                         goto out_resource;
2663                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2664                 p = xdr_encode_hyper(p, dummy64);
2665         }
2666         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2667                 p = xdr_reserve_space(xdr, 8);
2668                 if (!p)
2669                         goto out_resource;
2670                 dummy64 = (u64)stat.blocks << 9;
2671                 p = xdr_encode_hyper(p, dummy64);
2672         }
2673         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2674                 p = xdr_reserve_space(xdr, 12);
2675                 if (!p)
2676                         goto out_resource;
2677                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2678                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2679         }
2680         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2681                 p = xdr_reserve_space(xdr, 12);
2682                 if (!p)
2683                         goto out_resource;
2684                 *p++ = cpu_to_be32(0);
2685                 *p++ = cpu_to_be32(1);
2686                 *p++ = cpu_to_be32(0);
2687         }
2688         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2689                 p = xdr_reserve_space(xdr, 12);
2690                 if (!p)
2691                         goto out_resource;
2692                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2693                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2694         }
2695         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2696                 p = xdr_reserve_space(xdr, 12);
2697                 if (!p)
2698                         goto out_resource;
2699                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2700                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2701         }
2702         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2703                 p = xdr_reserve_space(xdr, 8);
2704                 if (!p)
2705                         goto out_resource;
2706                 /*
2707                  * Get parent's attributes if not ignoring crossmount
2708                  * and this is the root of a cross-mounted filesystem.
2709                  */
2710                 if (ignore_crossmnt == 0 &&
2711                     dentry == exp->ex_path.mnt->mnt_root)
2712                         get_parent_attributes(exp, &stat);
2713                 p = xdr_encode_hyper(p, stat.ino);
2714         }
2715 #ifdef CONFIG_NFSD_PNFS
2716         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2717                 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2718                 if (status)
2719                         goto out;
2720         }
2721
2722         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2723                 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2724                 if (status)
2725                         goto out;
2726         }
2727
2728         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2729                 p = xdr_reserve_space(xdr, 4);
2730                 if (!p)
2731                         goto out_resource;
2732                 *p++ = cpu_to_be32(stat.blksize);
2733         }
2734 #endif /* CONFIG_NFSD_PNFS */
2735         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2736                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2737                                                                 contextlen);
2738                 if (status)
2739                         goto out;
2740         }
2741         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2742                 p = xdr_reserve_space(xdr, 16);
2743                 if (!p)
2744                         goto out_resource;
2745                 *p++ = cpu_to_be32(3);
2746                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2747                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2748                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2749         }
2750
2751         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2752         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2753         status = nfs_ok;
2754
2755 out:
2756 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2757         if (context)
2758                 security_release_secctx(context, contextlen);
2759 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2760         kfree(acl);
2761         if (tempfh) {
2762                 fh_put(tempfh);
2763                 kfree(tempfh);
2764         }
2765         if (status)
2766                 xdr_truncate_encode(xdr, starting_len);
2767         return status;
2768 out_nfserr:
2769         status = nfserrno(err);
2770         goto out;
2771 out_resource:
2772         status = nfserr_resource;
2773         goto out;
2774 }
2775
2776 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2777                                 struct xdr_buf *buf, __be32 *p, int bytes)
2778 {
2779         xdr->scratch.iov_len = 0;
2780         memset(buf, 0, sizeof(struct xdr_buf));
2781         buf->head[0].iov_base = p;
2782         buf->head[0].iov_len = 0;
2783         buf->len = 0;
2784         xdr->buf = buf;
2785         xdr->iov = buf->head;
2786         xdr->p = p;
2787         xdr->end = (void *)p + bytes;
2788         buf->buflen = bytes;
2789 }
2790
2791 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2792                         struct svc_fh *fhp, struct svc_export *exp,
2793                         struct dentry *dentry, u32 *bmval,
2794                         struct svc_rqst *rqstp, int ignore_crossmnt)
2795 {
2796         struct xdr_buf dummy;
2797         struct xdr_stream xdr;
2798         __be32 ret;
2799
2800         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2801         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2802                                                         ignore_crossmnt);
2803         *p = xdr.p;
2804         return ret;
2805 }
2806
2807 static inline int attributes_need_mount(u32 *bmval)
2808 {
2809         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2810                 return 1;
2811         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2812                 return 1;
2813         return 0;
2814 }
2815
2816 static __be32
2817 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2818                         const char *name, int namlen)
2819 {
2820         struct svc_export *exp = cd->rd_fhp->fh_export;
2821         struct dentry *dentry;
2822         __be32 nfserr;
2823         int ignore_crossmnt = 0;
2824
2825         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2826         if (IS_ERR(dentry))
2827                 return nfserrno(PTR_ERR(dentry));
2828         if (d_really_is_negative(dentry)) {
2829                 /*
2830                  * nfsd_buffered_readdir drops the i_mutex between
2831                  * readdir and calling this callback, leaving a window
2832                  * where this directory entry could have gone away.
2833                  */
2834                 dput(dentry);
2835                 return nfserr_noent;
2836         }
2837
2838         exp_get(exp);
2839         /*
2840          * In the case of a mountpoint, the client may be asking for
2841          * attributes that are only properties of the underlying filesystem
2842          * as opposed to the cross-mounted file system. In such a case,
2843          * we will not follow the cross mount and will fill the attribtutes
2844          * directly from the mountpoint dentry.
2845          */
2846         if (nfsd_mountpoint(dentry, exp)) {
2847                 int err;
2848
2849                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2850                                 && !attributes_need_mount(cd->rd_bmval)) {
2851                         ignore_crossmnt = 1;
2852                         goto out_encode;
2853                 }
2854                 /*
2855                  * Why the heck aren't we just using nfsd_lookup??
2856                  * Different "."/".." handling?  Something else?
2857                  * At least, add a comment here to explain....
2858                  */
2859                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2860                 if (err) {
2861                         nfserr = nfserrno(err);
2862                         goto out_put;
2863                 }
2864                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2865                 if (nfserr)
2866                         goto out_put;
2867
2868         }
2869 out_encode:
2870         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2871                                         cd->rd_rqstp, ignore_crossmnt);
2872 out_put:
2873         dput(dentry);
2874         exp_put(exp);
2875         return nfserr;
2876 }
2877
2878 static __be32 *
2879 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2880 {
2881         __be32 *p;
2882
2883         p = xdr_reserve_space(xdr, 20);
2884         if (!p)
2885                 return NULL;
2886         *p++ = htonl(2);
2887         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2888         *p++ = htonl(0);                         /* bmval1 */
2889
2890         *p++ = htonl(4);     /* attribute length */
2891         *p++ = nfserr;       /* no htonl */
2892         return p;
2893 }
2894
2895 static int
2896 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2897                     loff_t offset, u64 ino, unsigned int d_type)
2898 {
2899         struct readdir_cd *ccd = ccdv;
2900         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2901         struct xdr_stream *xdr = cd->xdr;
2902         int start_offset = xdr->buf->len;
2903         int cookie_offset;
2904         u32 name_and_cookie;
2905         int entry_bytes;
2906         __be32 nfserr = nfserr_toosmall;
2907         __be64 wire_offset;
2908         __be32 *p;
2909
2910         /* In nfsv4, "." and ".." never make it onto the wire.. */
2911         if (name && isdotent(name, namlen)) {
2912                 cd->common.err = nfs_ok;
2913                 return 0;
2914         }
2915
2916         if (cd->cookie_offset) {
2917                 wire_offset = cpu_to_be64(offset);
2918                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2919                                                         &wire_offset, 8);
2920         }
2921
2922         p = xdr_reserve_space(xdr, 4);
2923         if (!p)
2924                 goto fail;
2925         *p++ = xdr_one;                             /* mark entry present */
2926         cookie_offset = xdr->buf->len;
2927         p = xdr_reserve_space(xdr, 3*4 + namlen);
2928         if (!p)
2929                 goto fail;
2930         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2931         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2932
2933         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2934         switch (nfserr) {
2935         case nfs_ok:
2936                 break;
2937         case nfserr_resource:
2938                 nfserr = nfserr_toosmall;
2939                 goto fail;
2940         case nfserr_noent:
2941                 xdr_truncate_encode(xdr, start_offset);
2942                 goto skip_entry;
2943         default:
2944                 /*
2945                  * If the client requested the RDATTR_ERROR attribute,
2946                  * we stuff the error code into this attribute
2947                  * and continue.  If this attribute was not requested,
2948                  * then in accordance with the spec, we fail the
2949                  * entire READDIR operation(!)
2950                  */
2951                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2952                         goto fail;
2953                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2954                 if (p == NULL) {
2955                         nfserr = nfserr_toosmall;
2956                         goto fail;
2957                 }
2958         }
2959         nfserr = nfserr_toosmall;
2960         entry_bytes = xdr->buf->len - start_offset;
2961         if (entry_bytes > cd->rd_maxcount)
2962                 goto fail;
2963         cd->rd_maxcount -= entry_bytes;
2964         /*
2965          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
2966          * let's always let through the first entry, at least:
2967          */
2968         if (!cd->rd_dircount)
2969                 goto fail;
2970         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
2971         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
2972                 goto fail;
2973         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
2974
2975         cd->cookie_offset = cookie_offset;
2976 skip_entry:
2977         cd->common.err = nfs_ok;
2978         return 0;
2979 fail:
2980         xdr_truncate_encode(xdr, start_offset);
2981         cd->common.err = nfserr;
2982         return -EINVAL;
2983 }
2984
2985 static __be32
2986 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2987 {
2988         __be32 *p;
2989
2990         p = xdr_reserve_space(xdr, sizeof(stateid_t));
2991         if (!p)
2992                 return nfserr_resource;
2993         *p++ = cpu_to_be32(sid->si_generation);
2994         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
2995                                         sizeof(stateid_opaque_t));
2996         return 0;
2997 }
2998
2999 static __be32
3000 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3001 {
3002         struct xdr_stream *xdr = &resp->xdr;
3003         __be32 *p;
3004
3005         if (!nfserr) {
3006                 p = xdr_reserve_space(xdr, 8);
3007                 if (!p)
3008                         return nfserr_resource;
3009                 *p++ = cpu_to_be32(access->ac_supported);
3010                 *p++ = cpu_to_be32(access->ac_resp_access);
3011         }
3012         return nfserr;
3013 }
3014
3015 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3016 {
3017         struct xdr_stream *xdr = &resp->xdr;
3018         __be32 *p;
3019
3020         if (!nfserr) {
3021                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3022                 if (!p)
3023                         return nfserr_resource;
3024                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3025                                                 NFS4_MAX_SESSIONID_LEN);
3026                 *p++ = cpu_to_be32(bcts->dir);
3027                 /* Sorry, we do not yet support RDMA over 4.1: */
3028                 *p++ = cpu_to_be32(0);
3029         }
3030         return nfserr;
3031 }
3032
3033 static __be32
3034 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3035 {
3036         struct xdr_stream *xdr = &resp->xdr;
3037
3038         if (!nfserr)
3039                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3040
3041         return nfserr;
3042 }
3043
3044
3045 static __be32
3046 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3047 {
3048         struct xdr_stream *xdr = &resp->xdr;
3049         __be32 *p;
3050
3051         if (!nfserr) {
3052                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3053                 if (!p)
3054                         return nfserr_resource;
3055                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3056                                                 NFS4_VERIFIER_SIZE);
3057         }
3058         return nfserr;
3059 }
3060
3061 static __be32
3062 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3063 {
3064         struct xdr_stream *xdr = &resp->xdr;
3065         __be32 *p;
3066
3067         if (!nfserr) {
3068                 p = xdr_reserve_space(xdr, 32);
3069                 if (!p)
3070                         return nfserr_resource;
3071                 p = encode_cinfo(p, &create->cr_cinfo);
3072                 *p++ = cpu_to_be32(2);
3073                 *p++ = cpu_to_be32(create->cr_bmval[0]);
3074                 *p++ = cpu_to_be32(create->cr_bmval[1]);
3075         }
3076         return nfserr;
3077 }
3078
3079 static __be32
3080 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3081 {
3082         struct svc_fh *fhp = getattr->ga_fhp;
3083         struct xdr_stream *xdr = &resp->xdr;
3084
3085         if (nfserr)
3086                 return nfserr;
3087
3088         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3089                                     getattr->ga_bmval,
3090                                     resp->rqstp, 0);
3091         return nfserr;
3092 }
3093
3094 static __be32
3095 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3096 {
3097         struct xdr_stream *xdr = &resp->xdr;
3098         struct svc_fh *fhp = *fhpp;
3099         unsigned int len;
3100         __be32 *p;
3101
3102         if (!nfserr) {
3103                 len = fhp->fh_handle.fh_size;
3104                 p = xdr_reserve_space(xdr, len + 4);
3105                 if (!p)
3106                         return nfserr_resource;
3107                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3108         }
3109         return nfserr;
3110 }
3111
3112 /*
3113 * Including all fields other than the name, a LOCK4denied structure requires
3114 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3115 */
3116 static __be32
3117 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3118 {
3119         struct xdr_netobj *conf = &ld->ld_owner;
3120         __be32 *p;
3121
3122 again:
3123         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3124         if (!p) {
3125                 /*
3126                  * Don't fail to return the result just because we can't
3127                  * return the conflicting open:
3128                  */
3129                 if (conf->len) {
3130                         kfree(conf->data);
3131                         conf->len = 0;
3132                         conf->data = NULL;
3133                         goto again;
3134                 }
3135                 return nfserr_resource;
3136         }
3137         p = xdr_encode_hyper(p, ld->ld_start);
3138         p = xdr_encode_hyper(p, ld->ld_length);
3139         *p++ = cpu_to_be32(ld->ld_type);
3140         if (conf->len) {
3141                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3142                 p = xdr_encode_opaque(p, conf->data, conf->len);
3143                 kfree(conf->data);
3144         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3145                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3146                 *p++ = cpu_to_be32(0); /* length of owner name */
3147         }
3148         return nfserr_denied;
3149 }
3150
3151 static __be32
3152 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3153 {
3154         struct xdr_stream *xdr = &resp->xdr;
3155
3156         if (!nfserr)
3157                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3158         else if (nfserr == nfserr_denied)
3159                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3160
3161         return nfserr;
3162 }
3163
3164 static __be32
3165 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3166 {
3167         struct xdr_stream *xdr = &resp->xdr;
3168
3169         if (nfserr == nfserr_denied)
3170                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3171         return nfserr;
3172 }
3173
3174 static __be32
3175 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3176 {
3177         struct xdr_stream *xdr = &resp->xdr;
3178
3179         if (!nfserr)
3180                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3181
3182         return nfserr;
3183 }
3184
3185
3186 static __be32
3187 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3188 {
3189         struct xdr_stream *xdr = &resp->xdr;
3190         __be32 *p;
3191
3192         if (!nfserr) {
3193                 p = xdr_reserve_space(xdr, 20);
3194                 if (!p)
3195                         return nfserr_resource;
3196                 p = encode_cinfo(p, &link->li_cinfo);
3197         }
3198         return nfserr;
3199 }
3200
3201
3202 static __be32
3203 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3204 {
3205         struct xdr_stream *xdr = &resp->xdr;
3206         __be32 *p;
3207
3208         if (nfserr)
3209                 goto out;
3210
3211         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3212         if (nfserr)
3213                 goto out;
3214         p = xdr_reserve_space(xdr, 40);
3215         if (!p)
3216                 return nfserr_resource;
3217         p = encode_cinfo(p, &open->op_cinfo);
3218         *p++ = cpu_to_be32(open->op_rflags);
3219         *p++ = cpu_to_be32(2);
3220         *p++ = cpu_to_be32(open->op_bmval[0]);
3221         *p++ = cpu_to_be32(open->op_bmval[1]);
3222         *p++ = cpu_to_be32(open->op_delegate_type);
3223
3224         switch (open->op_delegate_type) {
3225         case NFS4_OPEN_DELEGATE_NONE:
3226                 break;
3227         case NFS4_OPEN_DELEGATE_READ:
3228                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3229                 if (nfserr)
3230                         return nfserr;
3231                 p = xdr_reserve_space(xdr, 20);
3232                 if (!p)
3233                         return nfserr_resource;
3234                 *p++ = cpu_to_be32(open->op_recall);
3235
3236                 /*
3237                  * TODO: ACE's in delegations
3238                  */
3239                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3240                 *p++ = cpu_to_be32(0);
3241                 *p++ = cpu_to_be32(0);
3242                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3243                 break;
3244         case NFS4_OPEN_DELEGATE_WRITE:
3245                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3246                 if (nfserr)
3247                         return nfserr;
3248                 p = xdr_reserve_space(xdr, 32);
3249                 if (!p)
3250                         return nfserr_resource;
3251                 *p++ = cpu_to_be32(0);
3252
3253                 /*
3254                  * TODO: space_limit's in delegations
3255                  */
3256                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3257                 *p++ = cpu_to_be32(~(u32)0);
3258                 *p++ = cpu_to_be32(~(u32)0);
3259
3260                 /*
3261                  * TODO: ACE's in delegations
3262                  */
3263                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3264                 *p++ = cpu_to_be32(0);
3265                 *p++ = cpu_to_be32(0);
3266                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3267                 break;
3268         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3269                 switch (open->op_why_no_deleg) {
3270                 case WND4_CONTENTION:
3271                 case WND4_RESOURCE:
3272                         p = xdr_reserve_space(xdr, 8);
3273                         if (!p)
3274                                 return nfserr_resource;
3275                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3276                         /* deleg signaling not supported yet: */
3277                         *p++ = cpu_to_be32(0);
3278                         break;
3279                 default:
3280                         p = xdr_reserve_space(xdr, 4);
3281                         if (!p)
3282                                 return nfserr_resource;
3283                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3284                 }
3285                 break;
3286         default:
3287                 BUG();
3288         }
3289         /* XXX save filehandle here */
3290 out:
3291         return nfserr;
3292 }
3293
3294 static __be32
3295 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3296 {
3297         struct xdr_stream *xdr = &resp->xdr;
3298
3299         if (!nfserr)
3300                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3301
3302         return nfserr;
3303 }
3304
3305 static __be32
3306 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3307 {
3308         struct xdr_stream *xdr = &resp->xdr;
3309
3310         if (!nfserr)
3311                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3312
3313         return nfserr;
3314 }
3315
3316 static __be32 nfsd4_encode_splice_read(
3317                                 struct nfsd4_compoundres *resp,
3318                                 struct nfsd4_read *read,
3319                                 struct file *file, unsigned long maxcount)
3320 {
3321         struct xdr_stream *xdr = &resp->xdr;
3322         struct xdr_buf *buf = xdr->buf;
3323         u32 eof;
3324         int space_left;
3325         __be32 nfserr;
3326         __be32 *p = xdr->p - 2;
3327
3328         /* Make sure there will be room for padding if needed */
3329         if (xdr->end - xdr->p < 1)
3330                 return nfserr_resource;
3331
3332         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3333                                   read->rd_offset, &maxcount);
3334         if (nfserr) {
3335                 /*
3336                  * nfsd_splice_actor may have already messed with the
3337                  * page length; reset it so as not to confuse
3338                  * xdr_truncate_encode:
3339                  */
3340                 buf->page_len = 0;
3341                 return nfserr;
3342         }
3343
3344         eof = (read->rd_offset + maxcount >=
3345                d_inode(read->rd_fhp->fh_dentry)->i_size);
3346
3347         *(p++) = htonl(eof);
3348         *(p++) = htonl(maxcount);
3349
3350         buf->page_len = maxcount;
3351         buf->len += maxcount;
3352         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3353                                                         / PAGE_SIZE;
3354
3355         /* Use rest of head for padding and remaining ops: */
3356         buf->tail[0].iov_base = xdr->p;
3357         buf->tail[0].iov_len = 0;
3358         xdr->iov = buf->tail;
3359         if (maxcount&3) {
3360                 int pad = 4 - (maxcount&3);
3361
3362                 *(xdr->p++) = 0;
3363
3364                 buf->tail[0].iov_base += maxcount&3;
3365                 buf->tail[0].iov_len = pad;
3366                 buf->len += pad;
3367         }
3368
3369         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3370                                 buf->buflen - buf->len);
3371         buf->buflen = buf->len + space_left;
3372         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3373
3374         return 0;
3375 }
3376
3377 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3378                                  struct nfsd4_read *read,
3379                                  struct file *file, unsigned long maxcount)
3380 {
3381         struct xdr_stream *xdr = &resp->xdr;
3382         u32 eof;
3383         int v;
3384         int starting_len = xdr->buf->len - 8;
3385         long len;
3386         int thislen;
3387         __be32 nfserr;
3388         __be32 tmp;
3389         __be32 *p;
3390         u32 zzz = 0;
3391         int pad;
3392
3393         len = maxcount;
3394         v = 0;
3395
3396         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3397         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3398         WARN_ON_ONCE(!p);
3399         resp->rqstp->rq_vec[v].iov_base = p;
3400         resp->rqstp->rq_vec[v].iov_len = thislen;
3401         v++;
3402         len -= thislen;
3403
3404         while (len) {
3405                 thislen = min_t(long, len, PAGE_SIZE);
3406                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3407                 WARN_ON_ONCE(!p);
3408                 resp->rqstp->rq_vec[v].iov_base = p;
3409                 resp->rqstp->rq_vec[v].iov_len = thislen;
3410                 v++;
3411                 len -= thislen;
3412         }
3413         read->rd_vlen = v;
3414
3415         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3416                         read->rd_vlen, &maxcount);
3417         if (nfserr)
3418                 return nfserr;
3419         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3420
3421         eof = (read->rd_offset + maxcount >=
3422                d_inode(read->rd_fhp->fh_dentry)->i_size);
3423
3424         tmp = htonl(eof);
3425         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3426         tmp = htonl(maxcount);
3427         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3428
3429         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3430         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3431                                                                 &zzz, pad);
3432         return 0;
3433
3434 }
3435
3436 static __be32
3437 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3438                   struct nfsd4_read *read)
3439 {
3440         unsigned long maxcount;
3441         struct xdr_stream *xdr = &resp->xdr;
3442         struct file *file = read->rd_filp;
3443         struct svc_fh *fhp = read->rd_fhp;
3444         int starting_len = xdr->buf->len;
3445         struct raparms *ra;
3446         __be32 *p;
3447         __be32 err;
3448
3449         if (nfserr)
3450                 return nfserr;
3451
3452         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3453         if (!p) {
3454                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3455                 return nfserr_resource;
3456         }
3457         if (resp->xdr.buf->page_len && test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3458                 WARN_ON_ONCE(1);
3459                 return nfserr_resource;
3460         }
3461         xdr_commit_encode(xdr);
3462
3463         maxcount = svc_max_payload(resp->rqstp);
3464         maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len));
3465         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3466
3467         if (read->rd_filp)
3468                 err = nfsd_permission(resp->rqstp, fhp->fh_export,
3469                                 fhp->fh_dentry,
3470                                 NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE);
3471         else
3472                 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
3473                                                 &file, &ra);
3474         if (err)
3475                 goto err_truncate;
3476
3477         if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3478                 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
3479         else
3480                 err = nfsd4_encode_readv(resp, read, file, maxcount);
3481
3482         if (!read->rd_filp)
3483                 nfsd_put_tmp_read_open(file, ra);
3484
3485 err_truncate:
3486         if (err)
3487                 xdr_truncate_encode(xdr, starting_len);
3488         return err;
3489 }
3490
3491 static __be32
3492 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3493 {
3494         int maxcount;
3495         __be32 wire_count;
3496         int zero = 0;
3497         struct xdr_stream *xdr = &resp->xdr;
3498         int length_offset = xdr->buf->len;
3499         __be32 *p;
3500
3501         if (nfserr)
3502                 return nfserr;
3503
3504         p = xdr_reserve_space(xdr, 4);
3505         if (!p)
3506                 return nfserr_resource;
3507         maxcount = PAGE_SIZE;
3508
3509         p = xdr_reserve_space(xdr, maxcount);
3510         if (!p)
3511                 return nfserr_resource;
3512         /*
3513          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3514          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3515          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3516          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3517          */
3518         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3519                                                 (char *)p, &maxcount);
3520         if (nfserr == nfserr_isdir)
3521                 nfserr = nfserr_inval;
3522         if (nfserr) {
3523                 xdr_truncate_encode(xdr, length_offset);
3524                 return nfserr;
3525         }
3526
3527         wire_count = htonl(maxcount);
3528         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3529         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3530         if (maxcount & 3)
3531                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3532                                                 &zero, 4 - (maxcount&3));
3533         return 0;
3534 }
3535
3536 static __be32
3537 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3538 {
3539         int maxcount;
3540         int bytes_left;
3541         loff_t offset;
3542         __be64 wire_offset;
3543         struct xdr_stream *xdr = &resp->xdr;
3544         int starting_len = xdr->buf->len;
3545         __be32 *p;
3546
3547         if (nfserr)
3548                 return nfserr;
3549
3550         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3551         if (!p)
3552                 return nfserr_resource;
3553
3554         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3555         *p++ = cpu_to_be32(0);
3556         *p++ = cpu_to_be32(0);
3557         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3558                                 - (char *)resp->xdr.buf->head[0].iov_base;
3559
3560         /*
3561          * Number of bytes left for directory entries allowing for the
3562          * final 8 bytes of the readdir and a following failed op:
3563          */
3564         bytes_left = xdr->buf->buflen - xdr->buf->len
3565                         - COMPOUND_ERR_SLACK_SPACE - 8;
3566         if (bytes_left < 0) {
3567                 nfserr = nfserr_resource;
3568                 goto err_no_verf;
3569         }
3570         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3571         /*
3572          * Note the rfc defines rd_maxcount as the size of the
3573          * READDIR4resok structure, which includes the verifier above
3574          * and the 8 bytes encoded at the end of this function:
3575          */
3576         if (maxcount < 16) {
3577                 nfserr = nfserr_toosmall;
3578                 goto err_no_verf;
3579         }
3580         maxcount = min_t(int, maxcount-16, bytes_left);
3581
3582         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3583         if (!readdir->rd_dircount)
3584                 readdir->rd_dircount = INT_MAX;
3585
3586         readdir->xdr = xdr;
3587         readdir->rd_maxcount = maxcount;
3588         readdir->common.err = 0;
3589         readdir->cookie_offset = 0;
3590
3591         offset = readdir->rd_cookie;
3592         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3593                               &offset,
3594                               &readdir->common, nfsd4_encode_dirent);
3595         if (nfserr == nfs_ok &&
3596             readdir->common.err == nfserr_toosmall &&
3597             xdr->buf->len == starting_len + 8) {
3598                 /* nothing encoded; which limit did we hit?: */
3599                 if (maxcount - 16 < bytes_left)
3600                         /* It was the fault of rd_maxcount: */
3601                         nfserr = nfserr_toosmall;
3602                 else
3603                         /* We ran out of buffer space: */
3604                         nfserr = nfserr_resource;
3605         }
3606         if (nfserr)
3607                 goto err_no_verf;
3608
3609         if (readdir->cookie_offset) {
3610                 wire_offset = cpu_to_be64(offset);
3611                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3612                                                         &wire_offset, 8);
3613         }
3614
3615         p = xdr_reserve_space(xdr, 8);
3616         if (!p) {
3617                 WARN_ON_ONCE(1);
3618                 goto err_no_verf;
3619         }
3620         *p++ = 0;       /* no more entries */
3621         *p++ = htonl(readdir->common.err == nfserr_eof);
3622
3623         return 0;
3624 err_no_verf:
3625         xdr_truncate_encode(xdr, starting_len);
3626         return nfserr;
3627 }
3628
3629 static __be32
3630 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3631 {
3632         struct xdr_stream *xdr = &resp->xdr;
3633         __be32 *p;
3634
3635         if (!nfserr) {
3636                 p = xdr_reserve_space(xdr, 20);
3637                 if (!p)
3638                         return nfserr_resource;
3639                 p = encode_cinfo(p, &remove->rm_cinfo);
3640         }
3641         return nfserr;
3642 }
3643
3644 static __be32
3645 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3646 {
3647         struct xdr_stream *xdr = &resp->xdr;
3648         __be32 *p;
3649
3650         if (!nfserr) {
3651                 p = xdr_reserve_space(xdr, 40);
3652                 if (!p)
3653                         return nfserr_resource;
3654                 p = encode_cinfo(p, &rename->rn_sinfo);
3655                 p = encode_cinfo(p, &rename->rn_tinfo);
3656         }
3657         return nfserr;
3658 }
3659
3660 static __be32
3661 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3662                          __be32 nfserr, struct svc_export *exp)
3663 {
3664         u32 i, nflavs, supported;
3665         struct exp_flavor_info *flavs;
3666         struct exp_flavor_info def_flavs[2];
3667         __be32 *p, *flavorsp;
3668         static bool report = true;
3669
3670         if (nfserr)
3671                 goto out;
3672         nfserr = nfserr_resource;
3673         if (exp->ex_nflavors) {
3674                 flavs = exp->ex_flavors;
3675                 nflavs = exp->ex_nflavors;
3676         } else { /* Handling of some defaults in absence of real secinfo: */
3677                 flavs = def_flavs;
3678                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3679                         nflavs = 2;
3680                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3681                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3682                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3683                         nflavs = 1;
3684                         flavs[0].pseudoflavor
3685                                         = svcauth_gss_flavor(exp->ex_client);
3686                 } else {
3687                         nflavs = 1;
3688                         flavs[0].pseudoflavor
3689                                         = exp->ex_client->flavour->flavour;
3690                 }
3691         }
3692
3693         supported = 0;
3694         p = xdr_reserve_space(xdr, 4);
3695         if (!p)
3696                 goto out;
3697         flavorsp = p++;         /* to be backfilled later */
3698
3699         for (i = 0; i < nflavs; i++) {
3700                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3701                 struct rpcsec_gss_info info;
3702
3703                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3704                         supported++;
3705                         p = xdr_reserve_space(xdr, 4 + 4 +
3706                                               XDR_LEN(info.oid.len) + 4 + 4);
3707                         if (!p)
3708                                 goto out;
3709                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3710                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3711                         *p++ = cpu_to_be32(info.qop);
3712                         *p++ = cpu_to_be32(info.service);
3713                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3714                         supported++;
3715                         p = xdr_reserve_space(xdr, 4);
3716                         if (!p)
3717                                 goto out;
3718                         *p++ = cpu_to_be32(pf);
3719                 } else {
3720                         if (report)
3721                                 pr_warn("NFS: SECINFO: security flavor %u "
3722                                         "is not supported\n", pf);
3723                 }
3724         }
3725
3726         if (nflavs != supported)
3727                 report = false;
3728         *flavorsp = htonl(supported);
3729         nfserr = 0;
3730 out:
3731         if (exp)
3732                 exp_put(exp);
3733         return nfserr;
3734 }
3735
3736 static __be32
3737 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3738                      struct nfsd4_secinfo *secinfo)
3739 {
3740         struct xdr_stream *xdr = &resp->xdr;
3741
3742         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3743 }
3744
3745 static __be32
3746 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3747                      struct nfsd4_secinfo_no_name *secinfo)
3748 {
3749         struct xdr_stream *xdr = &resp->xdr;
3750
3751         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3752 }
3753
3754 /*
3755  * The SETATTR encode routine is special -- it always encodes a bitmap,
3756  * regardless of the error status.
3757  */
3758 static __be32
3759 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3760 {
3761         struct xdr_stream *xdr = &resp->xdr;
3762         __be32 *p;
3763
3764         p = xdr_reserve_space(xdr, 16);
3765         if (!p)
3766                 return nfserr_resource;
3767         if (nfserr) {
3768                 *p++ = cpu_to_be32(3);
3769                 *p++ = cpu_to_be32(0);
3770                 *p++ = cpu_to_be32(0);
3771                 *p++ = cpu_to_be32(0);
3772         }
3773         else {
3774                 *p++ = cpu_to_be32(3);
3775                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3776                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3777                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3778         }
3779         return nfserr;
3780 }
3781
3782 static __be32
3783 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3784 {
3785         struct xdr_stream *xdr = &resp->xdr;
3786         __be32 *p;
3787
3788         if (!nfserr) {
3789                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3790                 if (!p)
3791                         return nfserr_resource;
3792                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3793                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3794                                                 NFS4_VERIFIER_SIZE);
3795         }
3796         else if (nfserr == nfserr_clid_inuse) {
3797                 p = xdr_reserve_space(xdr, 8);
3798                 if (!p)
3799                         return nfserr_resource;
3800                 *p++ = cpu_to_be32(0);
3801                 *p++ = cpu_to_be32(0);
3802         }
3803         return nfserr;
3804 }
3805
3806 static __be32
3807 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3808 {
3809         struct xdr_stream *xdr = &resp->xdr;
3810         __be32 *p;
3811
3812         if (!nfserr) {
3813                 p = xdr_reserve_space(xdr, 16);
3814                 if (!p)
3815                         return nfserr_resource;
3816                 *p++ = cpu_to_be32(write->wr_bytes_written);
3817                 *p++ = cpu_to_be32(write->wr_how_written);
3818                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3819                                                         NFS4_VERIFIER_SIZE);
3820         }
3821         return nfserr;
3822 }
3823
3824 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3825         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3826               1 << (OP_EXCHANGE_ID - 32) |
3827               1 << (OP_CREATE_SESSION - 32) |
3828               1 << (OP_DESTROY_SESSION - 32) |
3829               1 << (OP_DESTROY_CLIENTID - 32)
3830 };
3831
3832 static __be32
3833 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3834                          struct nfsd4_exchange_id *exid)
3835 {
3836         struct xdr_stream *xdr = &resp->xdr;
3837         __be32 *p;
3838         char *major_id;
3839         char *server_scope;
3840         int major_id_sz;
3841         int server_scope_sz;
3842         uint64_t minor_id = 0;
3843
3844         if (nfserr)
3845                 return nfserr;
3846
3847         major_id = utsname()->nodename;
3848         major_id_sz = strlen(major_id);
3849         server_scope = utsname()->nodename;
3850         server_scope_sz = strlen(server_scope);
3851
3852         p = xdr_reserve_space(xdr,
3853                 8 /* eir_clientid */ +
3854                 4 /* eir_sequenceid */ +
3855                 4 /* eir_flags */ +
3856                 4 /* spr_how */);
3857         if (!p)
3858                 return nfserr_resource;
3859
3860         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3861         *p++ = cpu_to_be32(exid->seqid);
3862         *p++ = cpu_to_be32(exid->flags);
3863
3864         *p++ = cpu_to_be32(exid->spa_how);
3865
3866         switch (exid->spa_how) {
3867         case SP4_NONE:
3868                 break;
3869         case SP4_MACH_CRED:
3870                 /* spo_must_enforce, spo_must_allow */
3871                 p = xdr_reserve_space(xdr, 16);
3872                 if (!p)
3873                         return nfserr_resource;
3874
3875                 /* spo_must_enforce bitmap: */
3876                 *p++ = cpu_to_be32(2);
3877                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3878                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3879                 /* empty spo_must_allow bitmap: */
3880                 *p++ = cpu_to_be32(0);
3881
3882                 break;
3883         default:
3884                 WARN_ON_ONCE(1);
3885         }
3886
3887         p = xdr_reserve_space(xdr,
3888                 8 /* so_minor_id */ +
3889                 4 /* so_major_id.len */ +
3890                 (XDR_QUADLEN(major_id_sz) * 4) +
3891                 4 /* eir_server_scope.len */ +
3892                 (XDR_QUADLEN(server_scope_sz) * 4) +
3893                 4 /* eir_server_impl_id.count (0) */);
3894         if (!p)
3895                 return nfserr_resource;
3896
3897         /* The server_owner struct */
3898         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3899         /* major id */
3900         p = xdr_encode_opaque(p, major_id, major_id_sz);
3901
3902         /* Server scope */
3903         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3904
3905         /* Implementation id */
3906         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3907         return 0;
3908 }
3909
3910 static __be32
3911 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3912                             struct nfsd4_create_session *sess)
3913 {
3914         struct xdr_stream *xdr = &resp->xdr;
3915         __be32 *p;
3916
3917         if (nfserr)
3918                 return nfserr;
3919
3920         p = xdr_reserve_space(xdr, 24);
3921         if (!p)
3922                 return nfserr_resource;
3923         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3924                                         NFS4_MAX_SESSIONID_LEN);
3925         *p++ = cpu_to_be32(sess->seqid);
3926         *p++ = cpu_to_be32(sess->flags);
3927
3928         p = xdr_reserve_space(xdr, 28);
3929         if (!p)
3930                 return nfserr_resource;
3931         *p++ = cpu_to_be32(0); /* headerpadsz */
3932         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3933         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3934         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3935         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3936         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3937         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3938
3939         if (sess->fore_channel.nr_rdma_attrs) {
3940                 p = xdr_reserve_space(xdr, 4);
3941                 if (!p)
3942                         return nfserr_resource;
3943                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3944         }
3945
3946         p = xdr_reserve_space(xdr, 28);
3947         if (!p)
3948                 return nfserr_resource;
3949         *p++ = cpu_to_be32(0); /* headerpadsz */
3950         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3951         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3952         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3953         *p++ = cpu_to_be32(sess->back_channel.maxops);
3954         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3955         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3956
3957         if (sess->back_channel.nr_rdma_attrs) {
3958                 p = xdr_reserve_space(xdr, 4);
3959                 if (!p)
3960                         return nfserr_resource;
3961                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3962         }
3963         return 0;
3964 }
3965
3966 static __be32
3967 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3968                       struct nfsd4_sequence *seq)
3969 {
3970         struct xdr_stream *xdr = &resp->xdr;
3971         __be32 *p;
3972
3973         if (nfserr)
3974                 return nfserr;
3975
3976         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3977         if (!p)
3978                 return nfserr_resource;
3979         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
3980                                         NFS4_MAX_SESSIONID_LEN);
3981         *p++ = cpu_to_be32(seq->seqid);
3982         *p++ = cpu_to_be32(seq->slotid);
3983         /* Note slotid's are numbered from zero: */
3984         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
3985         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
3986         *p++ = cpu_to_be32(seq->status_flags);
3987
3988         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3989         return 0;
3990 }
3991
3992 static __be32
3993 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3994                           struct nfsd4_test_stateid *test_stateid)
3995 {
3996         struct xdr_stream *xdr = &resp->xdr;
3997         struct nfsd4_test_stateid_id *stateid, *next;
3998         __be32 *p;
3999
4000         if (nfserr)
4001                 return nfserr;
4002
4003         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4004         if (!p)
4005                 return nfserr_resource;
4006         *p++ = htonl(test_stateid->ts_num_ids);
4007
4008         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4009                 *p++ = stateid->ts_id_status;
4010         }
4011
4012         return nfserr;
4013 }
4014
4015 #ifdef CONFIG_NFSD_PNFS
4016 static __be32
4017 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4018                 struct nfsd4_getdeviceinfo *gdev)
4019 {
4020         struct xdr_stream *xdr = &resp->xdr;
4021         const struct nfsd4_layout_ops *ops =
4022                 nfsd4_layout_ops[gdev->gd_layout_type];
4023         u32 starting_len = xdr->buf->len, needed_len;
4024         __be32 *p;
4025
4026         dprintk("%s: err %d\n", __func__, nfserr);
4027         if (nfserr)
4028                 goto out;
4029
4030         nfserr = nfserr_resource;
4031         p = xdr_reserve_space(xdr, 4);
4032         if (!p)
4033                 goto out;
4034
4035         *p++ = cpu_to_be32(gdev->gd_layout_type);
4036
4037         /* If maxcount is 0 then just update notifications */
4038         if (gdev->gd_maxcount != 0) {
4039                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4040                 if (nfserr) {
4041                         /*
4042                          * We don't bother to burden the layout drivers with
4043                          * enforcing gd_maxcount, just tell the client to
4044                          * come back with a bigger buffer if it's not enough.
4045                          */
4046                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4047                                 goto toosmall;
4048                         goto out;
4049                 }
4050         }
4051
4052         nfserr = nfserr_resource;
4053         if (gdev->gd_notify_types) {
4054                 p = xdr_reserve_space(xdr, 4 + 4);
4055                 if (!p)
4056                         goto out;
4057                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4058                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4059         } else {
4060                 p = xdr_reserve_space(xdr, 4);
4061                 if (!p)
4062                         goto out;
4063                 *p++ = 0;
4064         }
4065
4066         nfserr = 0;
4067 out:
4068         kfree(gdev->gd_device);
4069         dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4070         return nfserr;
4071
4072 toosmall:
4073         dprintk("%s: maxcount too small\n", __func__);
4074         needed_len = xdr->buf->len + 4 /* notifications */;
4075         xdr_truncate_encode(xdr, starting_len);
4076         p = xdr_reserve_space(xdr, 4);
4077         if (!p) {
4078                 nfserr = nfserr_resource;
4079         } else {
4080                 *p++ = cpu_to_be32(needed_len);
4081                 nfserr = nfserr_toosmall;
4082         }
4083         goto out;
4084 }
4085
4086 static __be32
4087 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4088                 struct nfsd4_layoutget *lgp)
4089 {
4090         struct xdr_stream *xdr = &resp->xdr;
4091         const struct nfsd4_layout_ops *ops =
4092                 nfsd4_layout_ops[lgp->lg_layout_type];
4093         __be32 *p;
4094
4095         dprintk("%s: err %d\n", __func__, nfserr);
4096         if (nfserr)
4097                 goto out;
4098
4099         nfserr = nfserr_resource;
4100         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4101         if (!p)
4102                 goto out;
4103
4104         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4105         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4106         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4107                                     sizeof(stateid_opaque_t));
4108
4109         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4110         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4111         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4112         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4113         *p++ = cpu_to_be32(lgp->lg_layout_type);
4114
4115         nfserr = ops->encode_layoutget(xdr, lgp);
4116 out:
4117         kfree(lgp->lg_content);
4118         return nfserr;
4119 }
4120
4121 static __be32
4122 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4123                           struct nfsd4_layoutcommit *lcp)
4124 {
4125         struct xdr_stream *xdr = &resp->xdr;
4126         __be32 *p;
4127
4128         if (nfserr)
4129                 return nfserr;
4130
4131         p = xdr_reserve_space(xdr, 4);
4132         if (!p)
4133                 return nfserr_resource;
4134         *p++ = cpu_to_be32(lcp->lc_size_chg);
4135         if (lcp->lc_size_chg) {
4136                 p = xdr_reserve_space(xdr, 8);
4137                 if (!p)
4138                         return nfserr_resource;
4139                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4140         }
4141
4142         return nfs_ok;
4143 }
4144
4145 static __be32
4146 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4147                 struct nfsd4_layoutreturn *lrp)
4148 {
4149         struct xdr_stream *xdr = &resp->xdr;
4150         __be32 *p;
4151
4152         if (nfserr)
4153                 return nfserr;
4154
4155         p = xdr_reserve_space(xdr, 4);
4156         if (!p)
4157                 return nfserr_resource;
4158         *p++ = cpu_to_be32(lrp->lrs_present);
4159         if (lrp->lrs_present)
4160                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4161         return nfs_ok;
4162 }
4163 #endif /* CONFIG_NFSD_PNFS */
4164
4165 static __be32
4166 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4167                   struct nfsd4_seek *seek)
4168 {
4169         __be32 *p;
4170
4171         if (nfserr)
4172                 return nfserr;
4173
4174         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4175         *p++ = cpu_to_be32(seek->seek_eof);
4176         p = xdr_encode_hyper(p, seek->seek_pos);
4177
4178         return nfserr;
4179 }
4180
4181 static __be32
4182 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4183 {
4184         return nfserr;
4185 }
4186
4187 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4188
4189 /*
4190  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4191  * since we don't need to filter out obsolete ops as this is
4192  * done in the decoding phase.
4193  */
4194 static nfsd4_enc nfsd4_enc_ops[] = {
4195         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4196         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4197         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4198         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4199         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4200         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4201         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4202         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4203         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4204         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4205         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4206         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4207         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4208         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4209         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4210         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4211         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4212         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4213         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4214         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4215         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4216         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4217         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4218         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4219         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4220         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4221         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4222         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4223         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4224         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4225         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4226         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4227         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4228         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4229         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4230         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4231         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4232
4233         /* NFSv4.1 operations */
4234         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4235         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4236         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4237         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4238         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4239         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4240         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4241 #ifdef CONFIG_NFSD_PNFS
4242         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4243         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4244         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4245         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4246         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4247 #else
4248         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4249         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4250         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4251         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4252         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4253 #endif
4254         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4255         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4256         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4257         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4258         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4259         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4260         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4261
4262         /* NFSv4.2 operations */
4263         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4264         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_noop,
4265         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4266         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4267         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4268         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4269         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4270         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4271         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4272         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4273         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4274         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4275 };
4276
4277 /*
4278  * Calculate whether we still have space to encode repsize bytes.
4279  * There are two considerations:
4280  *     - For NFS versions >=4.1, the size of the reply must stay within
4281  *       session limits
4282  *     - For all NFS versions, we must stay within limited preallocated
4283  *       buffer space.
4284  *
4285  * This is called before the operation is processed, so can only provide
4286  * an upper estimate.  For some nonidempotent operations (such as
4287  * getattr), it's not necessarily a problem if that estimate is wrong,
4288  * as we can fail it after processing without significant side effects.
4289  */
4290 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4291 {
4292         struct xdr_buf *buf = &resp->rqstp->rq_res;
4293         struct nfsd4_slot *slot = resp->cstate.slot;
4294
4295         if (buf->len + respsize <= buf->buflen)
4296                 return nfs_ok;
4297         if (!nfsd4_has_session(&resp->cstate))
4298                 return nfserr_resource;
4299         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4300                 WARN_ON_ONCE(1);
4301                 return nfserr_rep_too_big_to_cache;
4302         }
4303         return nfserr_rep_too_big;
4304 }
4305
4306 void
4307 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4308 {
4309         struct xdr_stream *xdr = &resp->xdr;
4310         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4311         struct svc_rqst *rqstp = resp->rqstp;
4312         int post_err_offset;
4313         nfsd4_enc encoder;
4314         __be32 *p;
4315
4316         p = xdr_reserve_space(xdr, 8);
4317         if (!p) {
4318                 WARN_ON_ONCE(1);
4319                 return;
4320         }
4321         *p++ = cpu_to_be32(op->opnum);
4322         post_err_offset = xdr->buf->len;
4323
4324         if (op->opnum == OP_ILLEGAL)
4325                 goto status;
4326         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4327                !nfsd4_enc_ops[op->opnum]);
4328         encoder = nfsd4_enc_ops[op->opnum];
4329         op->status = encoder(resp, op->status, &op->u);
4330         xdr_commit_encode(xdr);
4331
4332         /* nfsd4_check_resp_size guarantees enough room for error status */
4333         if (!op->status) {
4334                 int space_needed = 0;
4335                 if (!nfsd4_last_compound_op(rqstp))
4336                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4337                 op->status = nfsd4_check_resp_size(resp, space_needed);
4338         }
4339         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4340                 struct nfsd4_slot *slot = resp->cstate.slot;
4341
4342                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4343                         op->status = nfserr_rep_too_big_to_cache;
4344                 else
4345                         op->status = nfserr_rep_too_big;
4346         }
4347         if (op->status == nfserr_resource ||
4348             op->status == nfserr_rep_too_big ||
4349             op->status == nfserr_rep_too_big_to_cache) {
4350                 /*
4351                  * The operation may have already been encoded or
4352                  * partially encoded.  No op returns anything additional
4353                  * in the case of one of these three errors, so we can
4354                  * just truncate back to after the status.  But it's a
4355                  * bug if we had to do this on a non-idempotent op:
4356                  */
4357                 warn_on_nonidempotent_op(op);
4358                 xdr_truncate_encode(xdr, post_err_offset);
4359         }
4360         if (so) {
4361                 int len = xdr->buf->len - post_err_offset;
4362
4363                 so->so_replay.rp_status = op->status;
4364                 so->so_replay.rp_buflen = len;
4365                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4366                                                 so->so_replay.rp_buf, len);
4367         }
4368 status:
4369         /* Note that op->status is already in network byte order: */
4370         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4371 }
4372
4373 /*
4374  * Encode the reply stored in the stateowner reply cache
4375  *
4376  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4377  * previously sent already encoded operation.
4378  */
4379 void
4380 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4381 {
4382         __be32 *p;
4383         struct nfs4_replay *rp = op->replay;
4384
4385         BUG_ON(!rp);
4386
4387         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4388         if (!p) {
4389                 WARN_ON_ONCE(1);
4390                 return;
4391         }
4392         *p++ = cpu_to_be32(op->opnum);
4393         *p++ = rp->rp_status;  /* already xdr'ed */
4394
4395         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4396 }
4397
4398 int
4399 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4400 {
4401         return xdr_ressize_check(rqstp, p);
4402 }
4403
4404 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4405 {
4406         struct svc_rqst *rqstp = rq;
4407         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4408
4409         if (args->ops != args->iops) {
4410                 kfree(args->ops);
4411                 args->ops = args->iops;
4412         }
4413         kfree(args->tmpp);
4414         args->tmpp = NULL;
4415         while (args->to_free) {
4416                 struct svcxdr_tmpbuf *tb = args->to_free;
4417                 args->to_free = tb->next;
4418                 kfree(tb);
4419         }
4420         return 1;
4421 }
4422
4423 int
4424 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4425 {
4426         if (rqstp->rq_arg.head[0].iov_len % 4) {
4427                 /* client is nuts */
4428                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4429                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4430                 return 0;
4431         }
4432         args->p = p;
4433         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4434         args->pagelist = rqstp->rq_arg.pages;
4435         args->pagelen = rqstp->rq_arg.page_len;
4436         args->tmpp = NULL;
4437         args->to_free = NULL;
4438         args->ops = args->iops;
4439         args->rqstp = rqstp;
4440
4441         return !nfsd4_decode_compound(args);
4442 }
4443
4444 int
4445 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4446 {
4447         /*
4448          * All that remains is to write the tag and operation count...
4449          */
4450         struct xdr_buf *buf = resp->xdr.buf;
4451
4452         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4453                                  buf->tail[0].iov_len);
4454
4455         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4456
4457         p = resp->tagp;
4458         *p++ = htonl(resp->taglen);
4459         memcpy(p, resp->tag, resp->taglen);
4460         p += XDR_QUADLEN(resp->taglen);
4461         *p++ = htonl(resp->opcnt);
4462
4463         nfsd4_sequence_done(resp);
4464         return 1;
4465 }
4466
4467 /*
4468  * Local variables:
4469  *  c-basic-offset: 8
4470  * End:
4471  */