fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 #include <linux/file.h>
  37 #include <linux/slab.h>
  38 #include <linux/namei.h>
  39 #include <linux/statfs.h>
  40 #include <linux/utsname.h>
  41 #include <linux/pagemap.h>
  42 #include <linux/sunrpc/svcauth_gss.h>
  43
  44 #include "idmap.h"
  45 #include "acl.h"
  46 #include "xdr4.h"
  47 #include "vfs.h"
  48 #include "state.h"
  49 #include "cache.h"
  50 #include "netns.h"
  51 #include "pnfs.h"
  52
  53 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  54 #include <linux/security.h>
  55 #endif
  56
  57
  58 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  59
  60 /*
  61  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  62  * directory in order to indicate to the client that a filesystem boundary is present
  63  * We use a fixed fsid for a referral
  64  */
  65 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  66 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  67
  68 static __be32
  69 check_filename(char *str, int len)
  70 {
  71         int i;
  72
  73         if (len == 0)
  74                 return nfserr_inval;
  75         if (isdotent(str, len))
  76                 return nfserr_badname;
  77         for (i = 0; i < len; i++)
  78                 if (str[i] == '/')
  79                         return nfserr_badname;
  80         return 0;
  81 }
  82
  83 #define DECODE_HEAD                             \
  84         __be32 *p;                              \
  85         __be32 status
  86 #define DECODE_TAIL                             \
  87         status = 0;                             \
  88 out:                                            \
  89         return status;                          \
  90 xdr_error:                                      \
  91         dprintk("NFSD: xdr error (%s:%d)\n",    \
  92                         __FILE__, __LINE__);    \
  93         status = nfserr_bad_xdr;                \
  94         goto out
  95
  96 #define READMEM(x,nbytes) do {                  \
  97         x = (char *)p;                          \
  98         p += XDR_QUADLEN(nbytes);               \
  99 } while (0)
 100 #define SAVEMEM(x,nbytes) do {                  \
 101         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 102                 savemem(argp, p, nbytes) :      \
 103                 (char *)p)) {                   \
 104                 dprintk("NFSD: xdr error (%s:%d)\n", \
 105                                 __FILE__, __LINE__); \
 106                 goto xdr_error;                 \
 107                 }                               \
 108         p += XDR_QUADLEN(nbytes);               \
 109 } while (0)
 110 #define COPYMEM(x,nbytes) do {                  \
 111         memcpy((x), p, nbytes);                 \
 112         p += XDR_QUADLEN(nbytes);               \
 113 } while (0)
 114
 115 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 116 #define READ_BUF(nbytes)  do {                  \
 117         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 118                 p = argp->p;                    \
 119                 argp->p += XDR_QUADLEN(nbytes); \
 120         } else if (!(p = read_buf(argp, nbytes))) { \
 121                 dprintk("NFSD: xdr error (%s:%d)\n", \
 122                                 __FILE__, __LINE__); \
 123                 goto xdr_error;                 \
 124         }                                       \
 125 } while (0)
 126
 127 static void next_decode_page(struct nfsd4_compoundargs *argp)
 128 {
 129         argp->p = page_address(argp->pagelist[0]);
 130         argp->pagelist++;
 131         if (argp->pagelen < PAGE_SIZE) {
 132                 argp->end = argp->p + (argp->pagelen>>2);
 133                 argp->pagelen = 0;
 134         } else {
 135                 argp->end = argp->p + (PAGE_SIZE>>2);
 136                 argp->pagelen -= PAGE_SIZE;
 137         }
 138 }
 139
 140 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 141 {
 142         /* We want more bytes than seem to be available.
 143          * Maybe we need a new page, maybe we have just run out
 144          */
 145         unsigned int avail = (char *)argp->end - (char *)argp->p;
 146         __be32 *p;
 147         if (avail + argp->pagelen < nbytes)
 148                 return NULL;
 149         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 150                 return NULL;
 151         /* ok, we can do it with the current plus the next page */
 152         if (nbytes <= sizeof(argp->tmp))
 153                 p = argp->tmp;
 154         else {
 155                 kfree(argp->tmpp);
 156                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 157                 if (!p)
 158                         return NULL;
 159
 160         }
 161         /*
 162          * The following memcpy is safe because read_buf is always
 163          * called with nbytes > avail, and the two cases above both
 164          * guarantee p points to at least nbytes bytes.
 165          */
 166         memcpy(p, argp->p, avail);
 167         next_decode_page(argp);
 168         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 169         argp->p += XDR_QUADLEN(nbytes - avail);
 170         return p;
 171 }
 172
 173 static int zero_clientid(clientid_t *clid)
 174 {
 175         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 176 }
 177
 178 /**
 179  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 180  * @argp: NFSv4 compound argument structure
 181  * @p: pointer to be freed (with kfree())
 182  *
 183  * Marks @p to be freed when processing the compound operation
 184  * described in @argp finishes.
 185  */
 186 static void *
 187 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 188 {
 189         struct svcxdr_tmpbuf *tb;
 190
 191         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 192         if (!tb)
 193                 return NULL;
 194         tb->next = argp->to_free;
 195         argp->to_free = tb;
 196         return tb->buf;
 197 }
 198
 199 /*
 200  * For xdr strings that need to be passed to other kernel api's
 201  * as null-terminated strings.
 202  *
 203  * Note null-terminating in place usually isn't safe since the
 204  * buffer might end on a page boundary.
 205  */
 206 static char *
 207 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 208 {
 209         char *p = svcxdr_tmpalloc(argp, len + 1);
 210
 211         if (!p)
 212                 return NULL;
 213         memcpy(p, buf, len);
 214         p[len] = '\0';
 215         return p;
 216 }
 217
 218 /**
 219  * savemem - duplicate a chunk of memory for later processing
 220  * @argp: NFSv4 compound argument structure to be freed with
 221  * @p: pointer to be duplicated
 222  * @nbytes: length to be duplicated
 223  *
 224  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 225  * that are preserved until processing of the NFSv4 compound
 226  * operation described by @argp finishes.
 227  */
 228 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 229 {
 230         void *ret;
 231
 232         ret = svcxdr_tmpalloc(argp, nbytes);
 233         if (!ret)
 234                 return NULL;
 235         memcpy(ret, p, nbytes);
 236         return ret;
 237 }
 238
 239 /*
 240  * We require the high 32 bits of 'seconds' to be 0, and
 241  * we ignore all 32 bits of 'nseconds'.
 242  */
 243 static __be32
 244 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
 245 {
 246         DECODE_HEAD;
 247         u64 sec;
 248
 249         READ_BUF(12);
 250         p = xdr_decode_hyper(p, &sec);
 251         tv->tv_sec = sec;
 252         tv->tv_nsec = be32_to_cpup(p++);
 253         if (tv->tv_nsec >= (u32)1000000000)
 254                 return nfserr_inval;
 255
 256         DECODE_TAIL;
 257 }
 258
 259 static __be32
 260 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 261 {
 262         u32 bmlen;
 263         DECODE_HEAD;
 264
 265         bmval[0] = 0;
 266         bmval[1] = 0;
 267         bmval[2] = 0;
 268
 269         READ_BUF(4);
 270         bmlen = be32_to_cpup(p++);
 271         if (bmlen > 1000)
 272                 goto xdr_error;
 273
 274         READ_BUF(bmlen << 2);
 275         if (bmlen > 0)
 276                 bmval[0] = be32_to_cpup(p++);
 277         if (bmlen > 1)
 278                 bmval[1] = be32_to_cpup(p++);
 279         if (bmlen > 2)
 280                 bmval[2] = be32_to_cpup(p++);
 281
 282         DECODE_TAIL;
 283 }
 284
 285 static __be32
 286 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 287                    struct iattr *iattr, struct nfs4_acl **acl,
 288                    struct xdr_netobj *label)
 289 {
 290         int expected_len, len = 0;
 291         u32 dummy32;
 292         char *buf;
 293
 294         DECODE_HEAD;
 295         iattr->ia_valid = 0;
 296         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 297                 return status;
 298
 299         READ_BUF(4);
 300         expected_len = be32_to_cpup(p++);
 301
 302         if (bmval[0] & FATTR4_WORD0_SIZE) {
 303                 READ_BUF(8);
 304                 len += 8;
 305                 p = xdr_decode_hyper(p, &iattr->ia_size);
 306                 iattr->ia_valid |= ATTR_SIZE;
 307         }
 308         if (bmval[0] & FATTR4_WORD0_ACL) {
 309                 u32 nace;
 310                 struct nfs4_ace *ace;
 311
 312                 READ_BUF(4); len += 4;
 313                 nace = be32_to_cpup(p++);
 314
 315                 if (nace > NFS4_ACL_MAX)
 316                         return nfserr_fbig;
 317
 318                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
 319                 if (*acl == NULL)
 320                         return nfserr_jukebox;
 321
 322                 (*acl)->naces = nace;
 323                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 324                         READ_BUF(16); len += 16;
 325                         ace->type = be32_to_cpup(p++);
 326                         ace->flag = be32_to_cpup(p++);
 327                         ace->access_mask = be32_to_cpup(p++);
 328                         dummy32 = be32_to_cpup(p++);
 329                         READ_BUF(dummy32);
 330                         len += XDR_QUADLEN(dummy32) << 2;
 331                         READMEM(buf, dummy32);
 332                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 333                         status = nfs_ok;
 334                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 335                                 ;
 336                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 337                                 status = nfsd_map_name_to_gid(argp->rqstp,
 338                                                 buf, dummy32, &ace->who_gid);
 339                         else
 340                                 status = nfsd_map_name_to_uid(argp->rqstp,
 341                                                 buf, dummy32, &ace->who_uid);
 342                         if (status)
 343                                 return status;
 344                 }
 345         } else
 346                 *acl = NULL;
 347         if (bmval[1] & FATTR4_WORD1_MODE) {
 348                 READ_BUF(4);
 349                 len += 4;
 350                 iattr->ia_mode = be32_to_cpup(p++);
 351                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 352                 iattr->ia_valid |= ATTR_MODE;
 353         }
 354         if (bmval[1] & FATTR4_WORD1_OWNER) {
 355                 READ_BUF(4);
 356                 len += 4;
 357                 dummy32 = be32_to_cpup(p++);
 358                 READ_BUF(dummy32);
 359                 len += (XDR_QUADLEN(dummy32) << 2);
 360                 READMEM(buf, dummy32);
 361                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 362                         return status;
 363                 iattr->ia_valid |= ATTR_UID;
 364         }
 365         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 366                 READ_BUF(4);
 367                 len += 4;
 368                 dummy32 = be32_to_cpup(p++);
 369                 READ_BUF(dummy32);
 370                 len += (XDR_QUADLEN(dummy32) << 2);
 371                 READMEM(buf, dummy32);
 372                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 373                         return status;
 374                 iattr->ia_valid |= ATTR_GID;
 375         }
 376         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 377                 READ_BUF(4);
 378                 len += 4;
 379                 dummy32 = be32_to_cpup(p++);
 380                 switch (dummy32) {
 381                 case NFS4_SET_TO_CLIENT_TIME:
 382                         len += 12;
 383                         status = nfsd4_decode_time(argp, &iattr->ia_atime);
 384                         if (status)
 385                                 return status;
 386                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 387                         break;
 388                 case NFS4_SET_TO_SERVER_TIME:
 389                         iattr->ia_valid |= ATTR_ATIME;
 390                         break;
 391                 default:
 392                         goto xdr_error;
 393                 }
 394         }
 395         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 396                 READ_BUF(4);
 397                 len += 4;
 398                 dummy32 = be32_to_cpup(p++);
 399                 switch (dummy32) {
 400                 case NFS4_SET_TO_CLIENT_TIME:
 401                         len += 12;
 402                         status = nfsd4_decode_time(argp, &iattr->ia_mtime);
 403                         if (status)
 404                                 return status;
 405                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 406                         break;
 407                 case NFS4_SET_TO_SERVER_TIME:
 408                         iattr->ia_valid |= ATTR_MTIME;
 409                         break;
 410                 default:
 411                         goto xdr_error;
 412                 }
 413         }
 414
 415         label->len = 0;
 416 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 417         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 418                 READ_BUF(4);
 419                 len += 4;
 420                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 421                 READ_BUF(4);
 422                 len += 4;
 423                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 424                 READ_BUF(4);
 425                 len += 4;
 426                 dummy32 = be32_to_cpup(p++);
 427                 READ_BUF(dummy32);
 428                 if (dummy32 > NFS4_MAXLABELLEN)
 429                         return nfserr_badlabel;
 430                 len += (XDR_QUADLEN(dummy32) << 2);
 431                 READMEM(buf, dummy32);
 432                 label->len = dummy32;
 433                 label->data = svcxdr_dupstr(argp, buf, dummy32);
 434                 if (!label->data)
 435                         return nfserr_jukebox;
 436         }
 437 #endif
 438
 439         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 440             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 441             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 442                 READ_BUF(expected_len - len);
 443         else if (len != expected_len)
 444                 goto xdr_error;
 445
 446         DECODE_TAIL;
 447 }
 448
 449 static __be32
 450 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 451 {
 452         DECODE_HEAD;
 453
 454         READ_BUF(sizeof(stateid_t));
 455         sid->si_generation = be32_to_cpup(p++);
 456         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 457
 458         DECODE_TAIL;
 459 }
 460
 461 static __be32
 462 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 463 {
 464         DECODE_HEAD;
 465
 466         READ_BUF(4);
 467         access->ac_req_access = be32_to_cpup(p++);
 468
 469         DECODE_TAIL;
 470 }
 471
 472 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 473 {
 474         DECODE_HEAD;
 475         u32 dummy, uid, gid;
 476         char *machine_name;
 477         int i;
 478         int nr_secflavs;
 479
 480         /* callback_sec_params4 */
 481         READ_BUF(4);
 482         nr_secflavs = be32_to_cpup(p++);
 483         if (nr_secflavs)
 484                 cbs->flavor = (u32)(-1);
 485         else
 486                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 487                 cbs->flavor = 0;
 488         for (i = 0; i < nr_secflavs; ++i) {
 489                 READ_BUF(4);
 490                 dummy = be32_to_cpup(p++);
 491                 switch (dummy) {
 492                 case RPC_AUTH_NULL:
 493                         /* Nothing to read */
 494                         if (cbs->flavor == (u32)(-1))
 495                                 cbs->flavor = RPC_AUTH_NULL;
 496                         break;
 497                 case RPC_AUTH_UNIX:
 498                         READ_BUF(8);
 499                         /* stamp */
 500                         dummy = be32_to_cpup(p++);
 501
 502                         /* machine name */
 503                         dummy = be32_to_cpup(p++);
 504                         READ_BUF(dummy);
 505                         SAVEMEM(machine_name, dummy);
 506
 507                         /* uid, gid */
 508                         READ_BUF(8);
 509                         uid = be32_to_cpup(p++);
 510                         gid = be32_to_cpup(p++);
 511
 512                         /* more gids */
 513                         READ_BUF(4);
 514                         dummy = be32_to_cpup(p++);
 515                         READ_BUF(dummy * 4);
 516                         if (cbs->flavor == (u32)(-1)) {
 517                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 518                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 519                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 520                                         cbs->uid = kuid;
 521                                         cbs->gid = kgid;
 522                                         cbs->flavor = RPC_AUTH_UNIX;
 523                                 } else {
 524                                         dprintk("RPC_AUTH_UNIX with invalid"
 525                                                 "uid or gid ignoring!\n");
 526                                 }
 527                         }
 528                         break;
 529                 case RPC_AUTH_GSS:
 530                         dprintk("RPC_AUTH_GSS callback secflavor "
 531                                 "not supported!\n");
 532                         READ_BUF(8);
 533                         /* gcbp_service */
 534                         dummy = be32_to_cpup(p++);
 535                         /* gcbp_handle_from_server */
 536                         dummy = be32_to_cpup(p++);
 537                         READ_BUF(dummy);
 538                         p += XDR_QUADLEN(dummy);
 539                         /* gcbp_handle_from_client */
 540                         READ_BUF(4);
 541                         dummy = be32_to_cpup(p++);
 542                         READ_BUF(dummy);
 543                         break;
 544                 default:
 545                         dprintk("Illegal callback secflavor\n");
 546                         return nfserr_inval;
 547                 }
 548         }
 549         DECODE_TAIL;
 550 }
 551
 552 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 553 {
 554         DECODE_HEAD;
 555
 556         READ_BUF(4);
 557         bc->bc_cb_program = be32_to_cpup(p++);
 558         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 559
 560         DECODE_TAIL;
 561 }
 562
 563 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 564 {
 565         DECODE_HEAD;
 566
 567         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 568         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 569         bcts->dir = be32_to_cpup(p++);
 570         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 571          * could help us figure out we should be using it. */
 572         DECODE_TAIL;
 573 }
 574
 575 static __be32
 576 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 577 {
 578         DECODE_HEAD;
 579
 580         READ_BUF(4);
 581         close->cl_seqid = be32_to_cpup(p++);
 582         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 583
 584         DECODE_TAIL;
 585 }
 586
 587
 588 static __be32
 589 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 590 {
 591         DECODE_HEAD;
 592
 593         READ_BUF(12);
 594         p = xdr_decode_hyper(p, &commit->co_offset);
 595         commit->co_count = be32_to_cpup(p++);
 596
 597         DECODE_TAIL;
 598 }
 599
 600 static __be32
 601 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 602 {
 603         DECODE_HEAD;
 604
 605         READ_BUF(4);
 606         create->cr_type = be32_to_cpup(p++);
 607         switch (create->cr_type) {
 608         case NF4LNK:
 609                 READ_BUF(4);
 610                 create->cr_datalen = be32_to_cpup(p++);
 611                 READ_BUF(create->cr_datalen);
 612                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 613                 if (!create->cr_data)
 614                         return nfserr_jukebox;
 615                 break;
 616         case NF4BLK:
 617         case NF4CHR:
 618                 READ_BUF(8);
 619                 create->cr_specdata1 = be32_to_cpup(p++);
 620                 create->cr_specdata2 = be32_to_cpup(p++);
 621                 break;
 622         case NF4SOCK:
 623         case NF4FIFO:
 624         case NF4DIR:
 625         default:
 626                 break;
 627         }
 628
 629         READ_BUF(4);
 630         create->cr_namelen = be32_to_cpup(p++);
 631         READ_BUF(create->cr_namelen);
 632         SAVEMEM(create->cr_name, create->cr_namelen);
 633         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 634                 return status;
 635
 636         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 637                                     &create->cr_acl, &create->cr_label);
 638         if (status)
 639                 goto out;
 640
 641         DECODE_TAIL;
 642 }
 643
 644 static inline __be32
 645 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 646 {
 647         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 648 }
 649
 650 static inline __be32
 651 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 652 {
 653         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 654 }
 655
 656 static __be32
 657 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 658 {
 659         DECODE_HEAD;
 660
 661         READ_BUF(4);
 662         link->li_namelen = be32_to_cpup(p++);
 663         READ_BUF(link->li_namelen);
 664         SAVEMEM(link->li_name, link->li_namelen);
 665         if ((status = check_filename(link->li_name, link->li_namelen)))
 666                 return status;
 667
 668         DECODE_TAIL;
 669 }
 670
 671 static __be32
 672 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 673 {
 674         DECODE_HEAD;
 675
 676         /*
 677         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 678         */
 679         READ_BUF(28);
 680         lock->lk_type = be32_to_cpup(p++);
 681         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 682                 goto xdr_error;
 683         lock->lk_reclaim = be32_to_cpup(p++);
 684         p = xdr_decode_hyper(p, &lock->lk_offset);
 685         p = xdr_decode_hyper(p, &lock->lk_length);
 686         lock->lk_is_new = be32_to_cpup(p++);
 687
 688         if (lock->lk_is_new) {
 689                 READ_BUF(4);
 690                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 691                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 692                 if (status)
 693                         return status;
 694                 READ_BUF(8 + sizeof(clientid_t));
 695                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 696                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 697                 lock->lk_new_owner.len = be32_to_cpup(p++);
 698                 READ_BUF(lock->lk_new_owner.len);
 699                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 700         } else {
 701                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 702                 if (status)
 703                         return status;
 704                 READ_BUF(4);
 705                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 706         }
 707
 708         DECODE_TAIL;
 709 }
 710
 711 static __be32
 712 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 713 {
 714         DECODE_HEAD;
 715
 716         READ_BUF(32);
 717         lockt->lt_type = be32_to_cpup(p++);
 718         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 719                 goto xdr_error;
 720         p = xdr_decode_hyper(p, &lockt->lt_offset);
 721         p = xdr_decode_hyper(p, &lockt->lt_length);
 722         COPYMEM(&lockt->lt_clientid, 8);
 723         lockt->lt_owner.len = be32_to_cpup(p++);
 724         READ_BUF(lockt->lt_owner.len);
 725         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 726
 727         DECODE_TAIL;
 728 }
 729
 730 static __be32
 731 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 732 {
 733         DECODE_HEAD;
 734
 735         READ_BUF(8);
 736         locku->lu_type = be32_to_cpup(p++);
 737         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 738                 goto xdr_error;
 739         locku->lu_seqid = be32_to_cpup(p++);
 740         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 741         if (status)
 742                 return status;
 743         READ_BUF(16);
 744         p = xdr_decode_hyper(p, &locku->lu_offset);
 745         p = xdr_decode_hyper(p, &locku->lu_length);
 746
 747         DECODE_TAIL;
 748 }
 749
 750 static __be32
 751 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 752 {
 753         DECODE_HEAD;
 754
 755         READ_BUF(4);
 756         lookup->lo_len = be32_to_cpup(p++);
 757         READ_BUF(lookup->lo_len);
 758         SAVEMEM(lookup->lo_name, lookup->lo_len);
 759         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 760                 return status;
 761
 762         DECODE_TAIL;
 763 }
 764
 765 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 766 {
 767         __be32 *p;
 768         u32 w;
 769
 770         READ_BUF(4);
 771         w = be32_to_cpup(p++);
 772         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 773         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 774         if (deleg_when)
 775                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 776
 777         switch (w & NFS4_SHARE_ACCESS_MASK) {
 778         case NFS4_SHARE_ACCESS_READ:
 779         case NFS4_SHARE_ACCESS_WRITE:
 780         case NFS4_SHARE_ACCESS_BOTH:
 781                 break;
 782         default:
 783                 return nfserr_bad_xdr;
 784         }
 785         w &= ~NFS4_SHARE_ACCESS_MASK;
 786         if (!w)
 787                 return nfs_ok;
 788         if (!argp->minorversion)
 789                 return nfserr_bad_xdr;
 790         switch (w & NFS4_SHARE_WANT_MASK) {
 791         case NFS4_SHARE_WANT_NO_PREFERENCE:
 792         case NFS4_SHARE_WANT_READ_DELEG:
 793         case NFS4_SHARE_WANT_WRITE_DELEG:
 794         case NFS4_SHARE_WANT_ANY_DELEG:
 795         case NFS4_SHARE_WANT_NO_DELEG:
 796         case NFS4_SHARE_WANT_CANCEL:
 797                 break;
 798         default:
 799                 return nfserr_bad_xdr;
 800         }
 801         w &= ~NFS4_SHARE_WANT_MASK;
 802         if (!w)
 803                 return nfs_ok;
 804
 805         if (!deleg_when)        /* open_downgrade */
 806                 return nfserr_inval;
 807         switch (w) {
 808         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 809         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 810         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 811               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 812                 return nfs_ok;
 813         }
 814 xdr_error:
 815         return nfserr_bad_xdr;
 816 }
 817
 818 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 819 {
 820         __be32 *p;
 821
 822         READ_BUF(4);
 823         *x = be32_to_cpup(p++);
 824         /* Note: unlinke access bits, deny bits may be zero. */
 825         if (*x & ~NFS4_SHARE_DENY_BOTH)
 826                 return nfserr_bad_xdr;
 827         return nfs_ok;
 828 xdr_error:
 829         return nfserr_bad_xdr;
 830 }
 831
 832 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 833 {
 834         __be32 *p;
 835
 836         READ_BUF(4);
 837         o->len = be32_to_cpup(p++);
 838
 839         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 840                 return nfserr_bad_xdr;
 841
 842         READ_BUF(o->len);
 843         SAVEMEM(o->data, o->len);
 844         return nfs_ok;
 845 xdr_error:
 846         return nfserr_bad_xdr;
 847 }
 848
 849 static __be32
 850 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 851 {
 852         DECODE_HEAD;
 853         u32 dummy;
 854
 855         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 856         open->op_iattr.ia_valid = 0;
 857         open->op_openowner = NULL;
 858
 859         open->op_xdr_error = 0;
 860         /* seqid, share_access, share_deny, clientid, ownerlen */
 861         READ_BUF(4);
 862         open->op_seqid = be32_to_cpup(p++);
 863         /* decode, yet ignore deleg_when until supported */
 864         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 865                                            &open->op_deleg_want, &dummy);
 866         if (status)
 867                 goto xdr_error;
 868         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 869         if (status)
 870                 goto xdr_error;
 871         READ_BUF(sizeof(clientid_t));
 872         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 873         status = nfsd4_decode_opaque(argp, &open->op_owner);
 874         if (status)
 875                 goto xdr_error;
 876         READ_BUF(4);
 877         open->op_create = be32_to_cpup(p++);
 878         switch (open->op_create) {
 879         case NFS4_OPEN_NOCREATE:
 880                 break;
 881         case NFS4_OPEN_CREATE:
 882                 READ_BUF(4);
 883                 open->op_createmode = be32_to_cpup(p++);
 884                 switch (open->op_createmode) {
 885                 case NFS4_CREATE_UNCHECKED:
 886                 case NFS4_CREATE_GUARDED:
 887                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 888                                 &open->op_iattr, &open->op_acl, &open->op_label);
 889                         if (status)
 890                                 goto out;
 891                         break;
 892                 case NFS4_CREATE_EXCLUSIVE:
 893                         READ_BUF(NFS4_VERIFIER_SIZE);
 894                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 895                         break;
 896                 case NFS4_CREATE_EXCLUSIVE4_1:
 897                         if (argp->minorversion < 1)
 898                                 goto xdr_error;
 899                         READ_BUF(NFS4_VERIFIER_SIZE);
 900                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 901                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 902                                 &open->op_iattr, &open->op_acl, &open->op_label);
 903                         if (status)
 904                                 goto out;
 905                         break;
 906                 default:
 907                         goto xdr_error;
 908                 }
 909                 break;
 910         default:
 911                 goto xdr_error;
 912         }
 913
 914         /* open_claim */
 915         READ_BUF(4);
 916         open->op_claim_type = be32_to_cpup(p++);
 917         switch (open->op_claim_type) {
 918         case NFS4_OPEN_CLAIM_NULL:
 919         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 920                 READ_BUF(4);
 921                 open->op_fname.len = be32_to_cpup(p++);
 922                 READ_BUF(open->op_fname.len);
 923                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 924                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 925                         return status;
 926                 break;
 927         case NFS4_OPEN_CLAIM_PREVIOUS:
 928                 READ_BUF(4);
 929                 open->op_delegate_type = be32_to_cpup(p++);
 930                 break;
 931         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 932                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 933                 if (status)
 934                         return status;
 935                 READ_BUF(4);
 936                 open->op_fname.len = be32_to_cpup(p++);
 937                 READ_BUF(open->op_fname.len);
 938                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 939                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 940                         return status;
 941                 break;
 942         case NFS4_OPEN_CLAIM_FH:
 943         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 944                 if (argp->minorversion < 1)
 945                         goto xdr_error;
 946                 /* void */
 947                 break;
 948         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 949                 if (argp->minorversion < 1)
 950                         goto xdr_error;
 951                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 952                 if (status)
 953                         return status;
 954                 break;
 955         default:
 956                 goto xdr_error;
 957         }
 958
 959         DECODE_TAIL;
 960 }
 961
 962 static __be32
 963 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 964 {
 965         DECODE_HEAD;
 966
 967         if (argp->minorversion >= 1)
 968                 return nfserr_notsupp;
 969
 970         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 971         if (status)
 972                 return status;
 973         READ_BUF(4);
 974         open_conf->oc_seqid = be32_to_cpup(p++);
 975
 976         DECODE_TAIL;
 977 }
 978
 979 static __be32
 980 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 981 {
 982         DECODE_HEAD;
 983
 984         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 985         if (status)
 986                 return status;
 987         READ_BUF(4);
 988         open_down->od_seqid = be32_to_cpup(p++);
 989         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 990                                            &open_down->od_deleg_want, NULL);
 991         if (status)
 992                 return status;
 993         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 994         if (status)
 995                 return status;
 996         DECODE_TAIL;
 997 }
 998
 999 static __be32
1000 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1001 {
1002         DECODE_HEAD;
1003
1004         READ_BUF(4);
1005         putfh->pf_fhlen = be32_to_cpup(p++);
1006         if (putfh->pf_fhlen > NFS4_FHSIZE)
1007                 goto xdr_error;
1008         READ_BUF(putfh->pf_fhlen);
1009         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1010
1011         DECODE_TAIL;
1012 }
1013
1014 static __be32
1015 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1016 {
1017         if (argp->minorversion == 0)
1018                 return nfs_ok;
1019         return nfserr_notsupp;
1020 }
1021
1022 static __be32
1023 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1024 {
1025         DECODE_HEAD;
1026
1027         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1028         if (status)
1029                 return status;
1030         READ_BUF(12);
1031         p = xdr_decode_hyper(p, &read->rd_offset);
1032         read->rd_length = be32_to_cpup(p++);
1033
1034         DECODE_TAIL;
1035 }
1036
1037 static __be32
1038 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1039 {
1040         DECODE_HEAD;
1041
1042         READ_BUF(24);
1043         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1044         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1045         readdir->rd_dircount = be32_to_cpup(p++);
1046         readdir->rd_maxcount = be32_to_cpup(p++);
1047         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1048                 goto out;
1049
1050         DECODE_TAIL;
1051 }
1052
1053 static __be32
1054 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1055 {
1056         DECODE_HEAD;
1057
1058         READ_BUF(4);
1059         remove->rm_namelen = be32_to_cpup(p++);
1060         READ_BUF(remove->rm_namelen);
1061         SAVEMEM(remove->rm_name, remove->rm_namelen);
1062         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1063                 return status;
1064
1065         DECODE_TAIL;
1066 }
1067
1068 static __be32
1069 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1070 {
1071         DECODE_HEAD;
1072
1073         READ_BUF(4);
1074         rename->rn_snamelen = be32_to_cpup(p++);
1075         READ_BUF(rename->rn_snamelen);
1076         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1077         READ_BUF(4);
1078         rename->rn_tnamelen = be32_to_cpup(p++);
1079         READ_BUF(rename->rn_tnamelen);
1080         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1081         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1082                 return status;
1083         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1084                 return status;
1085
1086         DECODE_TAIL;
1087 }
1088
1089 static __be32
1090 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1091 {
1092         DECODE_HEAD;
1093
1094         if (argp->minorversion >= 1)
1095                 return nfserr_notsupp;
1096
1097         READ_BUF(sizeof(clientid_t));
1098         COPYMEM(clientid, sizeof(clientid_t));
1099
1100         DECODE_TAIL;
1101 }
1102
1103 static __be32
1104 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1105                      struct nfsd4_secinfo *secinfo)
1106 {
1107         DECODE_HEAD;
1108
1109         READ_BUF(4);
1110         secinfo->si_namelen = be32_to_cpup(p++);
1111         READ_BUF(secinfo->si_namelen);
1112         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1113         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1114         if (status)
1115                 return status;
1116         DECODE_TAIL;
1117 }
1118
1119 static __be32
1120 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1121                      struct nfsd4_secinfo_no_name *sin)
1122 {
1123         DECODE_HEAD;
1124
1125         READ_BUF(4);
1126         sin->sin_style = be32_to_cpup(p++);
1127         DECODE_TAIL;
1128 }
1129
1130 static __be32
1131 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1132 {
1133         __be32 status;
1134
1135         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1136         if (status)
1137                 return status;
1138         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1139                                   &setattr->sa_acl, &setattr->sa_label);
1140 }
1141
1142 static __be32
1143 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1144 {
1145         DECODE_HEAD;
1146
1147         if (argp->minorversion >= 1)
1148                 return nfserr_notsupp;
1149
1150         READ_BUF(NFS4_VERIFIER_SIZE);
1151         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1152
1153         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1154         if (status)
1155                 return nfserr_bad_xdr;
1156         READ_BUF(8);
1157         setclientid->se_callback_prog = be32_to_cpup(p++);
1158         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1159         READ_BUF(setclientid->se_callback_netid_len);
1160         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1161         READ_BUF(4);
1162         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1163
1164         READ_BUF(setclientid->se_callback_addr_len);
1165         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1166         READ_BUF(4);
1167         setclientid->se_callback_ident = be32_to_cpup(p++);
1168
1169         DECODE_TAIL;
1170 }
1171
1172 static __be32
1173 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1174 {
1175         DECODE_HEAD;
1176
1177         if (argp->minorversion >= 1)
1178                 return nfserr_notsupp;
1179
1180         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1181         COPYMEM(&scd_c->sc_clientid, 8);
1182         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1183
1184         DECODE_TAIL;
1185 }
1186
1187 /* Also used for NVERIFY */
1188 static __be32
1189 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1190 {
1191         DECODE_HEAD;
1192
1193         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1194                 goto out;
1195
1196         /* For convenience's sake, we compare raw xdr'd attributes in
1197          * nfsd4_proc_verify */
1198
1199         READ_BUF(4);
1200         verify->ve_attrlen = be32_to_cpup(p++);
1201         READ_BUF(verify->ve_attrlen);
1202         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1203
1204         DECODE_TAIL;
1205 }
1206
1207 static __be32
1208 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1209 {
1210         int avail;
1211         int len;
1212         DECODE_HEAD;
1213
1214         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1215         if (status)
1216                 return status;
1217         READ_BUF(16);
1218         p = xdr_decode_hyper(p, &write->wr_offset);
1219         write->wr_stable_how = be32_to_cpup(p++);
1220         if (write->wr_stable_how > 2)
1221                 goto xdr_error;
1222         write->wr_buflen = be32_to_cpup(p++);
1223
1224         /* Sorry .. no magic macros for this.. *
1225          * READ_BUF(write->wr_buflen);
1226          * SAVEMEM(write->wr_buf, write->wr_buflen);
1227          */
1228         avail = (char*)argp->end - (char*)argp->p;
1229         if (avail + argp->pagelen < write->wr_buflen) {
1230                 dprintk("NFSD: xdr error (%s:%d)\n",
1231                                 __FILE__, __LINE__);
1232                 goto xdr_error;
1233         }
1234         write->wr_head.iov_base = p;
1235         write->wr_head.iov_len = avail;
1236         write->wr_pagelist = argp->pagelist;
1237
1238         len = XDR_QUADLEN(write->wr_buflen) << 2;
1239         if (len >= avail) {
1240                 int pages;
1241
1242                 len -= avail;
1243
1244                 pages = len >> PAGE_SHIFT;
1245                 argp->pagelist += pages;
1246                 argp->pagelen -= pages * PAGE_SIZE;
1247                 len -= pages * PAGE_SIZE;
1248
1249                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1250                 argp->pagelist++;
1251                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1252         }
1253         argp->p += XDR_QUADLEN(len);
1254
1255         DECODE_TAIL;
1256 }
1257
1258 static __be32
1259 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1260 {
1261         DECODE_HEAD;
1262
1263         if (argp->minorversion >= 1)
1264                 return nfserr_notsupp;
1265
1266         READ_BUF(12);
1267         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1268         rlockowner->rl_owner.len = be32_to_cpup(p++);
1269         READ_BUF(rlockowner->rl_owner.len);
1270         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1271
1272         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1273                 return nfserr_inval;
1274         DECODE_TAIL;
1275 }
1276
1277 static __be32
1278 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1279                          struct nfsd4_exchange_id *exid)
1280 {
1281         int dummy, tmp;
1282         DECODE_HEAD;
1283
1284         READ_BUF(NFS4_VERIFIER_SIZE);
1285         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1286
1287         status = nfsd4_decode_opaque(argp, &exid->clname);
1288         if (status)
1289                 return nfserr_bad_xdr;
1290
1291         READ_BUF(4);
1292         exid->flags = be32_to_cpup(p++);
1293
1294         /* Ignore state_protect4_a */
1295         READ_BUF(4);
1296         exid->spa_how = be32_to_cpup(p++);
1297         switch (exid->spa_how) {
1298         case SP4_NONE:
1299                 break;
1300         case SP4_MACH_CRED:
1301                 /* spo_must_enforce */
1302                 READ_BUF(4);
1303                 dummy = be32_to_cpup(p++);
1304                 READ_BUF(dummy * 4);
1305                 p += dummy;
1306
1307                 /* spo_must_allow */
1308                 READ_BUF(4);
1309                 dummy = be32_to_cpup(p++);
1310                 READ_BUF(dummy * 4);
1311                 p += dummy;
1312                 break;
1313         case SP4_SSV:
1314                 /* ssp_ops */
1315                 READ_BUF(4);
1316                 dummy = be32_to_cpup(p++);
1317                 READ_BUF(dummy * 4);
1318                 p += dummy;
1319
1320                 READ_BUF(4);
1321                 dummy = be32_to_cpup(p++);
1322                 READ_BUF(dummy * 4);
1323                 p += dummy;
1324
1325                 /* ssp_hash_algs<> */
1326                 READ_BUF(4);
1327                 tmp = be32_to_cpup(p++);
1328                 while (tmp--) {
1329                         READ_BUF(4);
1330                         dummy = be32_to_cpup(p++);
1331                         READ_BUF(dummy);
1332                         p += XDR_QUADLEN(dummy);
1333                 }
1334
1335                 /* ssp_encr_algs<> */
1336                 READ_BUF(4);
1337                 tmp = be32_to_cpup(p++);
1338                 while (tmp--) {
1339                         READ_BUF(4);
1340                         dummy = be32_to_cpup(p++);
1341                         READ_BUF(dummy);
1342                         p += XDR_QUADLEN(dummy);
1343                 }
1344
1345                 /* ssp_window and ssp_num_gss_handles */
1346                 READ_BUF(8);
1347                 dummy = be32_to_cpup(p++);
1348                 dummy = be32_to_cpup(p++);
1349                 break;
1350         default:
1351                 goto xdr_error;
1352         }
1353
1354         /* Ignore Implementation ID */
1355         READ_BUF(4);    /* nfs_impl_id4 array length */
1356         dummy = be32_to_cpup(p++);
1357
1358         if (dummy > 1)
1359                 goto xdr_error;
1360
1361         if (dummy == 1) {
1362                 /* nii_domain */
1363                 READ_BUF(4);
1364                 dummy = be32_to_cpup(p++);
1365                 READ_BUF(dummy);
1366                 p += XDR_QUADLEN(dummy);
1367
1368                 /* nii_name */
1369                 READ_BUF(4);
1370                 dummy = be32_to_cpup(p++);
1371                 READ_BUF(dummy);
1372                 p += XDR_QUADLEN(dummy);
1373
1374                 /* nii_date */
1375                 READ_BUF(12);
1376                 p += 3;
1377         }
1378         DECODE_TAIL;
1379 }
1380
1381 static __be32
1382 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1383                             struct nfsd4_create_session *sess)
1384 {
1385         DECODE_HEAD;
1386         u32 dummy;
1387
1388         READ_BUF(16);
1389         COPYMEM(&sess->clientid, 8);
1390         sess->seqid = be32_to_cpup(p++);
1391         sess->flags = be32_to_cpup(p++);
1392
1393         /* Fore channel attrs */
1394         READ_BUF(28);
1395         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1396         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1397         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1398         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1399         sess->fore_channel.maxops = be32_to_cpup(p++);
1400         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1401         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1402         if (sess->fore_channel.nr_rdma_attrs == 1) {
1403                 READ_BUF(4);
1404                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1405         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1406                 dprintk("Too many fore channel attr bitmaps!\n");
1407                 goto xdr_error;
1408         }
1409
1410         /* Back channel attrs */
1411         READ_BUF(28);
1412         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1413         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1414         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1415         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1416         sess->back_channel.maxops = be32_to_cpup(p++);
1417         sess->back_channel.maxreqs = be32_to_cpup(p++);
1418         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1419         if (sess->back_channel.nr_rdma_attrs == 1) {
1420                 READ_BUF(4);
1421                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1422         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1423                 dprintk("Too many back channel attr bitmaps!\n");
1424                 goto xdr_error;
1425         }
1426
1427         READ_BUF(4);
1428         sess->callback_prog = be32_to_cpup(p++);
1429         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1430         DECODE_TAIL;
1431 }
1432
1433 static __be32
1434 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1435                              struct nfsd4_destroy_session *destroy_session)
1436 {
1437         DECODE_HEAD;
1438         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1439         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1440
1441         DECODE_TAIL;
1442 }
1443
1444 static __be32
1445 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1446                           struct nfsd4_free_stateid *free_stateid)
1447 {
1448         DECODE_HEAD;
1449
1450         READ_BUF(sizeof(stateid_t));
1451         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1452         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1453
1454         DECODE_TAIL;
1455 }
1456
1457 static __be32
1458 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1459                       struct nfsd4_sequence *seq)
1460 {
1461         DECODE_HEAD;
1462
1463         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1464         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1465         seq->seqid = be32_to_cpup(p++);
1466         seq->slotid = be32_to_cpup(p++);
1467         seq->maxslots = be32_to_cpup(p++);
1468         seq->cachethis = be32_to_cpup(p++);
1469
1470         DECODE_TAIL;
1471 }
1472
1473 static __be32
1474 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1475 {
1476         int i;
1477         __be32 *p, status;
1478         struct nfsd4_test_stateid_id *stateid;
1479
1480         READ_BUF(4);
1481         test_stateid->ts_num_ids = ntohl(*p++);
1482
1483         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1484
1485         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1486                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1487                 if (!stateid) {
1488                         status = nfserrno(-ENOMEM);
1489                         goto out;
1490                 }
1491
1492                 INIT_LIST_HEAD(&stateid->ts_id_list);
1493                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1494
1495                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1496                 if (status)
1497                         goto out;
1498         }
1499
1500         status = 0;
1501 out:
1502         return status;
1503 xdr_error:
1504         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1505         status = nfserr_bad_xdr;
1506         goto out;
1507 }
1508
1509 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1510 {
1511         DECODE_HEAD;
1512
1513         READ_BUF(8);
1514         COPYMEM(&dc->clientid, 8);
1515
1516         DECODE_TAIL;
1517 }
1518
1519 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1520 {
1521         DECODE_HEAD;
1522
1523         READ_BUF(4);
1524         rc->rca_one_fs = be32_to_cpup(p++);
1525
1526         DECODE_TAIL;
1527 }
1528
1529 #ifdef CONFIG_NFSD_PNFS
1530 static __be32
1531 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1532                 struct nfsd4_getdeviceinfo *gdev)
1533 {
1534         DECODE_HEAD;
1535         u32 num, i;
1536
1537         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1538         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1539         gdev->gd_layout_type = be32_to_cpup(p++);
1540         gdev->gd_maxcount = be32_to_cpup(p++);
1541         num = be32_to_cpup(p++);
1542         if (num) {
1543                 READ_BUF(4 * num);
1544                 gdev->gd_notify_types = be32_to_cpup(p++);
1545                 for (i = 1; i < num; i++) {
1546                         if (be32_to_cpup(p++)) {
1547                                 status = nfserr_inval;
1548                                 goto out;
1549                         }
1550                 }
1551         }
1552         DECODE_TAIL;
1553 }
1554
1555 static __be32
1556 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1557                 struct nfsd4_layoutget *lgp)
1558 {
1559         DECODE_HEAD;
1560
1561         READ_BUF(36);
1562         lgp->lg_signal = be32_to_cpup(p++);
1563         lgp->lg_layout_type = be32_to_cpup(p++);
1564         lgp->lg_seg.iomode = be32_to_cpup(p++);
1565         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1566         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1567         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1568
1569         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1570         if (status)
1571                 return status;
1572
1573         READ_BUF(4);
1574         lgp->lg_maxcount = be32_to_cpup(p++);
1575
1576         DECODE_TAIL;
1577 }
1578
1579 static __be32
1580 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1581                 struct nfsd4_layoutcommit *lcp)
1582 {
1583         DECODE_HEAD;
1584         u32 timechange;
1585
1586         READ_BUF(20);
1587         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1588         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1589         lcp->lc_reclaim = be32_to_cpup(p++);
1590
1591         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1592         if (status)
1593                 return status;
1594
1595         READ_BUF(4);
1596         lcp->lc_newoffset = be32_to_cpup(p++);
1597         if (lcp->lc_newoffset) {
1598                 READ_BUF(8);
1599                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1600         } else
1601                 lcp->lc_last_wr = 0;
1602         READ_BUF(4);
1603         timechange = be32_to_cpup(p++);
1604         if (timechange) {
1605                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1606                 if (status)
1607                         return status;
1608         } else {
1609                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1610         }
1611         READ_BUF(8);
1612         lcp->lc_layout_type = be32_to_cpup(p++);
1613
1614         /*
1615          * Save the layout update in XDR format and let the layout driver deal
1616          * with it later.
1617          */
1618         lcp->lc_up_len = be32_to_cpup(p++);
1619         if (lcp->lc_up_len > 0) {
1620                 READ_BUF(lcp->lc_up_len);
1621                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1622         }
1623
1624         DECODE_TAIL;
1625 }
1626
1627 static __be32
1628 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1629                 struct nfsd4_layoutreturn *lrp)
1630 {
1631         DECODE_HEAD;
1632
1633         READ_BUF(16);
1634         lrp->lr_reclaim = be32_to_cpup(p++);
1635         lrp->lr_layout_type = be32_to_cpup(p++);
1636         lrp->lr_seg.iomode = be32_to_cpup(p++);
1637         lrp->lr_return_type = be32_to_cpup(p++);
1638         if (lrp->lr_return_type == RETURN_FILE) {
1639                 READ_BUF(16);
1640                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1641                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1642
1643                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1644                 if (status)
1645                         return status;
1646
1647                 READ_BUF(4);
1648                 lrp->lrf_body_len = be32_to_cpup(p++);
1649                 if (lrp->lrf_body_len > 0) {
1650                         READ_BUF(lrp->lrf_body_len);
1651                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1652                 }
1653         } else {
1654                 lrp->lr_seg.offset = 0;
1655                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1656         }
1657
1658         DECODE_TAIL;
1659 }
1660 #endif /* CONFIG_NFSD_PNFS */
1661
1662 static __be32
1663 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1664                        struct nfsd4_fallocate *fallocate)
1665 {
1666         DECODE_HEAD;
1667
1668         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1669         if (status)
1670                 return status;
1671
1672         READ_BUF(16);
1673         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1674         xdr_decode_hyper(p, &fallocate->falloc_length);
1675
1676         DECODE_TAIL;
1677 }
1678
1679 static __be32
1680 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1681 {
1682         DECODE_HEAD;
1683
1684         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1685         if (status)
1686                 return status;
1687
1688         READ_BUF(8 + 4);
1689         p = xdr_decode_hyper(p, &seek->seek_offset);
1690         seek->seek_whence = be32_to_cpup(p);
1691
1692         DECODE_TAIL;
1693 }
1694
1695 static __be32
1696 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1697 {
1698         return nfs_ok;
1699 }
1700
1701 static __be32
1702 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1703 {
1704         return nfserr_notsupp;
1705 }
1706
1707 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1708
1709 static nfsd4_dec nfsd4_dec_ops[] = {
1710         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1711         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1712         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1713         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1714         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1715         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1716         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1717         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1718         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1719         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1720         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1721         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1722         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1723         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1724         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1725         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1726         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1727         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1728         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1729         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1730         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1731         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1732         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1733         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1734         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1735         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1736         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1737         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1738         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1739         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1740         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1741         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1742         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1743         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1744         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1745         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1746         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1747
1748         /* new operations for NFSv4.1 */
1749         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1750         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1751         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1752         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1753         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1754         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1755         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1756 #ifdef CONFIG_NFSD_PNFS
1757         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1758         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1759         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1760         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1761         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1762 #else
1763         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1764         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1765         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1766         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1767         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1768 #endif
1769         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1770         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1771         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1772         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1773         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1774         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1775         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1776
1777         /* new operations for NFSv4.2 */
1778         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1779         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_notsupp,
1780         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1781         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1782         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1783         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1784         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1785         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1786         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1787         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1788         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1789         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1790 };
1791
1792 static inline bool
1793 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1794 {
1795         if (op->opnum < FIRST_NFS4_OP)
1796                 return false;
1797         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1798                 return false;
1799         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1800                 return false;
1801         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1802                 return false;
1803         return true;
1804 }
1805
1806 static __be32
1807 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1808 {
1809         DECODE_HEAD;
1810         struct nfsd4_op *op;
1811         bool cachethis = false;
1812         int auth_slack= argp->rqstp->rq_auth_slack;
1813         int max_reply = auth_slack + 8; /* opcnt, status */
1814         int readcount = 0;
1815         int readbytes = 0;
1816         int i;
1817
1818         READ_BUF(4);
1819         argp->taglen = be32_to_cpup(p++);
1820         READ_BUF(argp->taglen);
1821         SAVEMEM(argp->tag, argp->taglen);
1822         READ_BUF(8);
1823         argp->minorversion = be32_to_cpup(p++);
1824         argp->opcnt = be32_to_cpup(p++);
1825         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1826
1827         if (argp->taglen > NFSD4_MAX_TAGLEN)
1828                 goto xdr_error;
1829         if (argp->opcnt > 100)
1830                 goto xdr_error;
1831
1832         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1833                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1834                 if (!argp->ops) {
1835                         argp->ops = argp->iops;
1836                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1837                         goto xdr_error;
1838                 }
1839         }
1840
1841         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1842                 argp->opcnt = 0;
1843
1844         for (i = 0; i < argp->opcnt; i++) {
1845                 op = &argp->ops[i];
1846                 op->replay = NULL;
1847
1848                 READ_BUF(4);
1849                 op->opnum = be32_to_cpup(p++);
1850
1851                 if (nfsd4_opnum_in_range(argp, op))
1852                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1853                 else {
1854                         op->opnum = OP_ILLEGAL;
1855                         op->status = nfserr_op_illegal;
1856                 }
1857                 /*
1858                  * We'll try to cache the result in the DRC if any one
1859                  * op in the compound wants to be cached:
1860                  */
1861                 cachethis |= nfsd4_cache_this_op(op);
1862
1863                 if (op->opnum == OP_READ) {
1864                         readcount++;
1865                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1866                 } else
1867                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1868                 /*
1869                  * OP_LOCK may return a conflicting lock.  (Special case
1870                  * because it will just skip encoding this if it runs
1871                  * out of xdr buffer space, and it is the only operation
1872                  * that behaves this way.)
1873                  */
1874                 if (op->opnum == OP_LOCK)
1875                         max_reply += NFS4_OPAQUE_LIMIT;
1876
1877                 if (op->status) {
1878                         argp->opcnt = i+1;
1879                         break;
1880                 }
1881         }
1882         /* Sessions make the DRC unnecessary: */
1883         if (argp->minorversion)
1884                 cachethis = false;
1885         svc_reserve(argp->rqstp, max_reply + readbytes);
1886         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1887
1888         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1889                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1890
1891         DECODE_TAIL;
1892 }
1893
1894 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1895 {
1896         if (IS_I_VERSION(inode)) {
1897                 p = xdr_encode_hyper(p, inode->i_version);
1898         } else {
1899                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1900                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1901         }
1902         return p;
1903 }
1904
1905 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1906 {
1907         *p++ = cpu_to_be32(c->atomic);
1908         if (c->change_supported) {
1909                 p = xdr_encode_hyper(p, c->before_change);
1910                 p = xdr_encode_hyper(p, c->after_change);
1911         } else {
1912                 *p++ = cpu_to_be32(c->before_ctime_sec);
1913                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1914                 *p++ = cpu_to_be32(c->after_ctime_sec);
1915                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1916         }
1917         return p;
1918 }
1919
1920 /* Encode as an array of strings the string given with components
1921  * separated @sep, escaped with esc_enter and esc_exit.
1922  */
1923 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1924                                           char *components, char esc_enter,
1925                                           char esc_exit)
1926 {
1927         __be32 *p;
1928         __be32 pathlen;
1929         int pathlen_offset;
1930         int strlen, count=0;
1931         char *str, *end, *next;
1932
1933         dprintk("nfsd4_encode_components(%s)\n", components);
1934
1935         pathlen_offset = xdr->buf->len;
1936         p = xdr_reserve_space(xdr, 4);
1937         if (!p)
1938                 return nfserr_resource;
1939         p++; /* We will fill this in with @count later */
1940
1941         end = str = components;
1942         while (*end) {
1943                 bool found_esc = false;
1944
1945                 /* try to parse as esc_start, ..., esc_end, sep */
1946                 if (*str == esc_enter) {
1947                         for (; *end && (*end != esc_exit); end++)
1948                                 /* find esc_exit or end of string */;
1949                         next = end + 1;
1950                         if (*end && (!*next || *next == sep)) {
1951                                 str++;
1952                                 found_esc = true;
1953                         }
1954                 }
1955
1956                 if (!found_esc)
1957                         for (; *end && (*end != sep); end++)
1958                                 /* find sep or end of string */;
1959
1960                 strlen = end - str;
1961                 if (strlen) {
1962                         p = xdr_reserve_space(xdr, strlen + 4);
1963                         if (!p)
1964                                 return nfserr_resource;
1965                         p = xdr_encode_opaque(p, str, strlen);
1966                         count++;
1967                 }
1968                 else
1969                         end++;
1970                 if (found_esc)
1971                         end = next;
1972
1973                 str = end;
1974         }
1975         pathlen = htonl(count);
1976         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1977         return 0;
1978 }
1979
1980 /* Encode as an array of strings the string given with components
1981  * separated @sep.
1982  */
1983 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1984                                       char *components)
1985 {
1986         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1987 }
1988
1989 /*
1990  * encode a location element of a fs_locations structure
1991  */
1992 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1993                                         struct nfsd4_fs_location *location)
1994 {
1995         __be32 status;
1996
1997         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1998                                                 '[', ']');
1999         if (status)
2000                 return status;
2001         status = nfsd4_encode_components(xdr, '/', location->path);
2002         if (status)
2003                 return status;
2004         return 0;
2005 }
2006
2007 /*
2008  * Encode a path in RFC3530 'pathname4' format
2009  */
2010 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2011                                 const struct path *root,
2012                                 const struct path *path)
2013 {
2014         struct path cur = *path;
2015         __be32 *p;
2016         struct dentry **components = NULL;
2017         unsigned int ncomponents = 0;
2018         __be32 err = nfserr_jukebox;
2019
2020         dprintk("nfsd4_encode_components(");
2021
2022         path_get(&cur);
2023         /* First walk the path up to the nfsd root, and store the
2024          * dentries/path components in an array.
2025          */
2026         for (;;) {
2027                 if (path_equal(&cur, root))
2028                         break;
2029                 if (cur.dentry == cur.mnt->mnt_root) {
2030                         if (follow_up(&cur))
2031                                 continue;
2032                         goto out_free;
2033                 }
2034                 if ((ncomponents & 15) == 0) {
2035                         struct dentry **new;
2036                         new = krealloc(components,
2037                                         sizeof(*new) * (ncomponents + 16),
2038                                         GFP_KERNEL);
2039                         if (!new)
2040                                 goto out_free;
2041                         components = new;
2042                 }
2043                 components[ncomponents++] = cur.dentry;
2044                 cur.dentry = dget_parent(cur.dentry);
2045         }
2046         err = nfserr_resource;
2047         p = xdr_reserve_space(xdr, 4);
2048         if (!p)
2049                 goto out_free;
2050         *p++ = cpu_to_be32(ncomponents);
2051
2052         while (ncomponents) {
2053                 struct dentry *dentry = components[ncomponents - 1];
2054                 unsigned int len;
2055
2056                 spin_lock(&dentry->d_lock);
2057                 len = dentry->d_name.len;
2058                 p = xdr_reserve_space(xdr, len + 4);
2059                 if (!p) {
2060                         spin_unlock(&dentry->d_lock);
2061                         goto out_free;
2062                 }
2063                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2064                 dprintk("/%pd", dentry);
2065                 spin_unlock(&dentry->d_lock);
2066                 dput(dentry);
2067                 ncomponents--;
2068         }
2069
2070         err = 0;
2071 out_free:
2072         dprintk(")\n");
2073         while (ncomponents)
2074                 dput(components[--ncomponents]);
2075         kfree(components);
2076         path_put(&cur);
2077         return err;
2078 }
2079
2080 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2081                         struct svc_rqst *rqstp, const struct path *path)
2082 {
2083         struct svc_export *exp_ps;
2084         __be32 res;
2085
2086         exp_ps = rqst_find_fsidzero_export(rqstp);
2087         if (IS_ERR(exp_ps))
2088                 return nfserrno(PTR_ERR(exp_ps));
2089         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2090         exp_put(exp_ps);
2091         return res;
2092 }
2093
2094 /*
2095  *  encode a fs_locations structure
2096  */
2097 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2098                         struct svc_rqst *rqstp, struct svc_export *exp)
2099 {
2100         __be32 status;
2101         int i;
2102         __be32 *p;
2103         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2104
2105         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2106         if (status)
2107                 return status;
2108         p = xdr_reserve_space(xdr, 4);
2109         if (!p)
2110                 return nfserr_resource;
2111         *p++ = cpu_to_be32(fslocs->locations_count);
2112         for (i=0; i<fslocs->locations_count; i++) {
2113                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2114                 if (status)
2115                         return status;
2116         }
2117         return 0;
2118 }
2119
2120 static u32 nfs4_file_type(umode_t mode)
2121 {
2122         switch (mode & S_IFMT) {
2123         case S_IFIFO:   return NF4FIFO;
2124         case S_IFCHR:   return NF4CHR;
2125         case S_IFDIR:   return NF4DIR;
2126         case S_IFBLK:   return NF4BLK;
2127         case S_IFLNK:   return NF4LNK;
2128         case S_IFREG:   return NF4REG;
2129         case S_IFSOCK:  return NF4SOCK;
2130         default:        return NF4BAD;
2131         };
2132 }
2133
2134 static inline __be32
2135 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2136                      struct nfs4_ace *ace)
2137 {
2138         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2139                 return nfs4_acl_write_who(xdr, ace->whotype);
2140         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2141                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2142         else
2143                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2144 }
2145
2146 static inline __be32
2147 nfsd4_encode_layout_type(struct xdr_stream *xdr, enum pnfs_layouttype layout_type)
2148 {
2149         __be32 *p;
2150
2151         if (layout_type) {
2152                 p = xdr_reserve_space(xdr, 8);
2153                 if (!p)
2154                         return nfserr_resource;
2155                 *p++ = cpu_to_be32(1);
2156                 *p++ = cpu_to_be32(layout_type);
2157         } else {
2158                 p = xdr_reserve_space(xdr, 4);
2159                 if (!p)
2160                         return nfserr_resource;
2161                 *p++ = cpu_to_be32(0);
2162         }
2163
2164         return 0;
2165 }
2166
2167 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2168                               FATTR4_WORD0_RDATTR_ERROR)
2169 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2170 #define WORD2_ABSENT_FS_ATTRS 0
2171
2172 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2173 static inline __be32
2174 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2175                             void *context, int len)
2176 {
2177         __be32 *p;
2178
2179         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2180         if (!p)
2181                 return nfserr_resource;
2182
2183         /*
2184          * For now we use a 0 here to indicate the null translation; in
2185          * the future we may place a call to translation code here.
2186          */
2187         *p++ = cpu_to_be32(0); /* lfs */
2188         *p++ = cpu_to_be32(0); /* pi */
2189         p = xdr_encode_opaque(p, context, len);
2190         return 0;
2191 }
2192 #else
2193 static inline __be32
2194 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2195                             void *context, int len)
2196 { return 0; }
2197 #endif
2198
2199 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2200 {
2201         /* As per referral draft:  */
2202         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2203             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2204                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2205                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2206                         *rdattr_err = NFSERR_MOVED;
2207                 else
2208                         return nfserr_moved;
2209         }
2210         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2211         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2212         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2213         return 0;
2214 }
2215
2216
2217 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2218 {
2219         struct path path = exp->ex_path;
2220         int err;
2221
2222         path_get(&path);
2223         while (follow_up(&path)) {
2224                 if (path.dentry != path.mnt->mnt_root)
2225                         break;
2226         }
2227         err = vfs_getattr(&path, stat);
2228         path_put(&path);
2229         return err;
2230 }
2231
2232 static __be32
2233 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2234 {
2235         __be32 *p;
2236
2237         if (bmval2) {
2238                 p = xdr_reserve_space(xdr, 16);
2239                 if (!p)
2240                         goto out_resource;
2241                 *p++ = cpu_to_be32(3);
2242                 *p++ = cpu_to_be32(bmval0);
2243                 *p++ = cpu_to_be32(bmval1);
2244                 *p++ = cpu_to_be32(bmval2);
2245         } else if (bmval1) {
2246                 p = xdr_reserve_space(xdr, 12);
2247                 if (!p)
2248                         goto out_resource;
2249                 *p++ = cpu_to_be32(2);
2250                 *p++ = cpu_to_be32(bmval0);
2251                 *p++ = cpu_to_be32(bmval1);
2252         } else {
2253                 p = xdr_reserve_space(xdr, 8);
2254                 if (!p)
2255                         goto out_resource;
2256                 *p++ = cpu_to_be32(1);
2257                 *p++ = cpu_to_be32(bmval0);
2258         }
2259
2260         return 0;
2261 out_resource:
2262         return nfserr_resource;
2263 }
2264
2265 /*
2266  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2267  * ourselves.
2268  */
2269 static __be32
2270 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2271                 struct svc_export *exp,
2272                 struct dentry *dentry, u32 *bmval,
2273                 struct svc_rqst *rqstp, int ignore_crossmnt)
2274 {
2275         u32 bmval0 = bmval[0];
2276         u32 bmval1 = bmval[1];
2277         u32 bmval2 = bmval[2];
2278         struct kstat stat;
2279         struct svc_fh *tempfh = NULL;
2280         struct kstatfs statfs;
2281         __be32 *p;
2282         int starting_len = xdr->buf->len;
2283         int attrlen_offset;
2284         __be32 attrlen;
2285         u32 dummy;
2286         u64 dummy64;
2287         u32 rdattr_err = 0;
2288         __be32 status;
2289         int err;
2290         struct nfs4_acl *acl = NULL;
2291         void *context = NULL;
2292         int contextlen;
2293         bool contextsupport = false;
2294         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2295         u32 minorversion = resp->cstate.minorversion;
2296         struct path path = {
2297                 .mnt    = exp->ex_path.mnt,
2298                 .dentry = dentry,
2299         };
2300         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2301
2302         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2303         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2304         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2305         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2306
2307         if (exp->ex_fslocs.migrated) {
2308                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2309                 if (status)
2310                         goto out;
2311         }
2312
2313         err = vfs_getattr(&path, &stat);
2314         if (err)
2315                 goto out_nfserr;
2316         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2317                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2318             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2319                        FATTR4_WORD1_SPACE_TOTAL))) {
2320                 err = vfs_statfs(&path, &statfs);
2321                 if (err)
2322                         goto out_nfserr;
2323         }
2324         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2325                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2326                 status = nfserr_jukebox;
2327                 if (!tempfh)
2328                         goto out;
2329                 fh_init(tempfh, NFS4_FHSIZE);
2330                 status = fh_compose(tempfh, exp, dentry, NULL);
2331                 if (status)
2332                         goto out;
2333                 fhp = tempfh;
2334         }
2335         if (bmval0 & FATTR4_WORD0_ACL) {
2336                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2337                 if (err == -EOPNOTSUPP)
2338                         bmval0 &= ~FATTR4_WORD0_ACL;
2339                 else if (err == -EINVAL) {
2340                         status = nfserr_attrnotsupp;
2341                         goto out;
2342                 } else if (err != 0)
2343                         goto out_nfserr;
2344         }
2345
2346 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2347         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2348              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2349                 err = security_inode_getsecctx(d_inode(dentry),
2350                                                 &context, &contextlen);
2351                 contextsupport = (err == 0);
2352                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2353                         if (err == -EOPNOTSUPP)
2354                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2355                         else if (err)
2356                                 goto out_nfserr;
2357                 }
2358         }
2359 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2360
2361         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2362         if (status)
2363                 goto out;
2364
2365         attrlen_offset = xdr->buf->len;
2366         p = xdr_reserve_space(xdr, 4);
2367         if (!p)
2368                 goto out_resource;
2369         p++;                /* to be backfilled later */
2370
2371         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2372                 u32 word0 = nfsd_suppattrs0(minorversion);
2373                 u32 word1 = nfsd_suppattrs1(minorversion);
2374                 u32 word2 = nfsd_suppattrs2(minorversion);
2375
2376                 if (!IS_POSIXACL(dentry->d_inode))
2377                         word0 &= ~FATTR4_WORD0_ACL;
2378                 if (!contextsupport)
2379                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2380                 if (!word2) {
2381                         p = xdr_reserve_space(xdr, 12);
2382                         if (!p)
2383                                 goto out_resource;
2384                         *p++ = cpu_to_be32(2);
2385                         *p++ = cpu_to_be32(word0);
2386                         *p++ = cpu_to_be32(word1);
2387                 } else {
2388                         p = xdr_reserve_space(xdr, 16);
2389                         if (!p)
2390                                 goto out_resource;
2391                         *p++ = cpu_to_be32(3);
2392                         *p++ = cpu_to_be32(word0);
2393                         *p++ = cpu_to_be32(word1);
2394                         *p++ = cpu_to_be32(word2);
2395                 }
2396         }
2397         if (bmval0 & FATTR4_WORD0_TYPE) {
2398                 p = xdr_reserve_space(xdr, 4);
2399                 if (!p)
2400                         goto out_resource;
2401                 dummy = nfs4_file_type(stat.mode);
2402                 if (dummy == NF4BAD) {
2403                         status = nfserr_serverfault;
2404                         goto out;
2405                 }
2406                 *p++ = cpu_to_be32(dummy);
2407         }
2408         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2409                 p = xdr_reserve_space(xdr, 4);
2410                 if (!p)
2411                         goto out_resource;
2412                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2413                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2414                 else
2415                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2416                                                 NFS4_FH_VOL_RENAME);
2417         }
2418         if (bmval0 & FATTR4_WORD0_CHANGE) {
2419                 p = xdr_reserve_space(xdr, 8);
2420                 if (!p)
2421                         goto out_resource;
2422                 p = encode_change(p, &stat, d_inode(dentry));
2423         }
2424         if (bmval0 & FATTR4_WORD0_SIZE) {
2425                 p = xdr_reserve_space(xdr, 8);
2426                 if (!p)
2427                         goto out_resource;
2428                 p = xdr_encode_hyper(p, stat.size);
2429         }
2430         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2431                 p = xdr_reserve_space(xdr, 4);
2432                 if (!p)
2433                         goto out_resource;
2434                 *p++ = cpu_to_be32(1);
2435         }
2436         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2437                 p = xdr_reserve_space(xdr, 4);
2438                 if (!p)
2439                         goto out_resource;
2440                 *p++ = cpu_to_be32(1);
2441         }
2442         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2443                 p = xdr_reserve_space(xdr, 4);
2444                 if (!p)
2445                         goto out_resource;
2446                 *p++ = cpu_to_be32(0);
2447         }
2448         if (bmval0 & FATTR4_WORD0_FSID) {
2449                 p = xdr_reserve_space(xdr, 16);
2450                 if (!p)
2451                         goto out_resource;
2452                 if (exp->ex_fslocs.migrated) {
2453                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2454                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2455                 } else switch(fsid_source(fhp)) {
2456                 case FSIDSOURCE_FSID:
2457                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2458                         p = xdr_encode_hyper(p, (u64)0);
2459                         break;
2460                 case FSIDSOURCE_DEV:
2461                         *p++ = cpu_to_be32(0);
2462                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2463                         *p++ = cpu_to_be32(0);
2464                         *p++ = cpu_to_be32(MINOR(stat.dev));
2465                         break;
2466                 case FSIDSOURCE_UUID:
2467                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2468                                                                 EX_UUID_LEN);
2469                         break;
2470                 }
2471         }
2472         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2473                 p = xdr_reserve_space(xdr, 4);
2474                 if (!p)
2475                         goto out_resource;
2476                 *p++ = cpu_to_be32(0);
2477         }
2478         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2479                 p = xdr_reserve_space(xdr, 4);
2480                 if (!p)
2481                         goto out_resource;
2482                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2483         }
2484         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2485                 p = xdr_reserve_space(xdr, 4);
2486                 if (!p)
2487                         goto out_resource;
2488                 *p++ = cpu_to_be32(rdattr_err);
2489         }
2490         if (bmval0 & FATTR4_WORD0_ACL) {
2491                 struct nfs4_ace *ace;
2492
2493                 if (acl == NULL) {
2494                         p = xdr_reserve_space(xdr, 4);
2495                         if (!p)
2496                                 goto out_resource;
2497
2498                         *p++ = cpu_to_be32(0);
2499                         goto out_acl;
2500                 }
2501                 p = xdr_reserve_space(xdr, 4);
2502                 if (!p)
2503                         goto out_resource;
2504                 *p++ = cpu_to_be32(acl->naces);
2505
2506                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2507                         p = xdr_reserve_space(xdr, 4*3);
2508                         if (!p)
2509                                 goto out_resource;
2510                         *p++ = cpu_to_be32(ace->type);
2511                         *p++ = cpu_to_be32(ace->flag);
2512                         *p++ = cpu_to_be32(ace->access_mask &
2513                                                         NFS4_ACE_MASK_ALL);
2514                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2515                         if (status)
2516                                 goto out;
2517                 }
2518         }
2519 out_acl:
2520         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2521                 p = xdr_reserve_space(xdr, 4);
2522                 if (!p)
2523                         goto out_resource;
2524                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2525                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2526         }
2527         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2528                 p = xdr_reserve_space(xdr, 4);
2529                 if (!p)
2530                         goto out_resource;
2531                 *p++ = cpu_to_be32(1);
2532         }
2533         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2534                 p = xdr_reserve_space(xdr, 4);
2535                 if (!p)
2536                         goto out_resource;
2537                 *p++ = cpu_to_be32(0);
2538         }
2539         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2540                 p = xdr_reserve_space(xdr, 4);
2541                 if (!p)
2542                         goto out_resource;
2543                 *p++ = cpu_to_be32(1);
2544         }
2545         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2546                 p = xdr_reserve_space(xdr, 4);
2547                 if (!p)
2548                         goto out_resource;
2549                 *p++ = cpu_to_be32(1);
2550         }
2551         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2552                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2553                 if (!p)
2554                         goto out_resource;
2555                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2556                                         fhp->fh_handle.fh_size);
2557         }
2558         if (bmval0 & FATTR4_WORD0_FILEID) {
2559                 p = xdr_reserve_space(xdr, 8);
2560                 if (!p)
2561                         goto out_resource;
2562                 p = xdr_encode_hyper(p, stat.ino);
2563         }
2564         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2565                 p = xdr_reserve_space(xdr, 8);
2566                 if (!p)
2567                         goto out_resource;
2568                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2569         }
2570         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2571                 p = xdr_reserve_space(xdr, 8);
2572                 if (!p)
2573                         goto out_resource;
2574                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2575         }
2576         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2577                 p = xdr_reserve_space(xdr, 8);
2578                 if (!p)
2579                         goto out_resource;
2580                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2581         }
2582         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2583                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2584                 if (status)
2585                         goto out;
2586         }
2587         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2588                 p = xdr_reserve_space(xdr, 4);
2589                 if (!p)
2590                         goto out_resource;
2591                 *p++ = cpu_to_be32(1);
2592         }
2593         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2594                 p = xdr_reserve_space(xdr, 8);
2595                 if (!p)
2596                         goto out_resource;
2597                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2598         }
2599         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2600                 p = xdr_reserve_space(xdr, 4);
2601                 if (!p)
2602                         goto out_resource;
2603                 *p++ = cpu_to_be32(255);
2604         }
2605         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2606                 p = xdr_reserve_space(xdr, 4);
2607                 if (!p)
2608                         goto out_resource;
2609                 *p++ = cpu_to_be32(statfs.f_namelen);
2610         }
2611         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2612                 p = xdr_reserve_space(xdr, 8);
2613                 if (!p)
2614                         goto out_resource;
2615                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2616         }
2617         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2618                 p = xdr_reserve_space(xdr, 8);
2619                 if (!p)
2620                         goto out_resource;
2621                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2622         }
2623         if (bmval1 & FATTR4_WORD1_MODE) {
2624                 p = xdr_reserve_space(xdr, 4);
2625                 if (!p)
2626                         goto out_resource;
2627                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2628         }
2629         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2630                 p = xdr_reserve_space(xdr, 4);
2631                 if (!p)
2632                         goto out_resource;
2633                 *p++ = cpu_to_be32(1);
2634         }
2635         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2636                 p = xdr_reserve_space(xdr, 4);
2637                 if (!p)
2638                         goto out_resource;
2639                 *p++ = cpu_to_be32(stat.nlink);
2640         }
2641         if (bmval1 & FATTR4_WORD1_OWNER) {
2642                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2643                 if (status)
2644                         goto out;
2645         }
2646         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2647                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2648                 if (status)
2649                         goto out;
2650         }
2651         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2652                 p = xdr_reserve_space(xdr, 8);
2653                 if (!p)
2654                         goto out_resource;
2655                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2656                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2657         }
2658         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2659                 p = xdr_reserve_space(xdr, 8);
2660                 if (!p)
2661                         goto out_resource;
2662                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2663                 p = xdr_encode_hyper(p, dummy64);
2664         }
2665         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2666                 p = xdr_reserve_space(xdr, 8);
2667                 if (!p)
2668                         goto out_resource;
2669                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2670                 p = xdr_encode_hyper(p, dummy64);
2671         }
2672         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2673                 p = xdr_reserve_space(xdr, 8);
2674                 if (!p)
2675                         goto out_resource;
2676                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2677                 p = xdr_encode_hyper(p, dummy64);
2678         }
2679         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2680                 p = xdr_reserve_space(xdr, 8);
2681                 if (!p)
2682                         goto out_resource;
2683                 dummy64 = (u64)stat.blocks << 9;
2684                 p = xdr_encode_hyper(p, dummy64);
2685         }
2686         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2687                 p = xdr_reserve_space(xdr, 12);
2688                 if (!p)
2689                         goto out_resource;
2690                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2691                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2692         }
2693         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2694                 p = xdr_reserve_space(xdr, 12);
2695                 if (!p)
2696                         goto out_resource;
2697                 *p++ = cpu_to_be32(0);
2698                 *p++ = cpu_to_be32(1);
2699                 *p++ = cpu_to_be32(0);
2700         }
2701         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2702                 p = xdr_reserve_space(xdr, 12);
2703                 if (!p)
2704                         goto out_resource;
2705                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2706                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2707         }
2708         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2709                 p = xdr_reserve_space(xdr, 12);
2710                 if (!p)
2711                         goto out_resource;
2712                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2713                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2714         }
2715         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2716                 struct kstat parent_stat;
2717                 u64 ino = stat.ino;
2718
2719                 p = xdr_reserve_space(xdr, 8);
2720                 if (!p)
2721                         goto out_resource;
2722                 /*
2723                  * Get parent's attributes if not ignoring crossmount
2724                  * and this is the root of a cross-mounted filesystem.
2725                  */
2726                 if (ignore_crossmnt == 0 &&
2727                     dentry == exp->ex_path.mnt->mnt_root) {
2728                         err = get_parent_attributes(exp, &parent_stat);
2729                         if (err)
2730                                 goto out_nfserr;
2731                         ino = parent_stat.ino;
2732                 }
2733                 p = xdr_encode_hyper(p, ino);
2734         }
2735 #ifdef CONFIG_NFSD_PNFS
2736         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2737                 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2738                 if (status)
2739                         goto out;
2740         }
2741
2742         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2743                 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2744                 if (status)
2745                         goto out;
2746         }
2747
2748         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2749                 p = xdr_reserve_space(xdr, 4);
2750                 if (!p)
2751                         goto out_resource;
2752                 *p++ = cpu_to_be32(stat.blksize);
2753         }
2754 #endif /* CONFIG_NFSD_PNFS */
2755         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2756                 status = nfsd4_encode_bitmap(xdr, NFSD_SUPPATTR_EXCLCREAT_WORD0,
2757                                                   NFSD_SUPPATTR_EXCLCREAT_WORD1,
2758                                                   NFSD_SUPPATTR_EXCLCREAT_WORD2);
2759                 if (status)
2760                         goto out;
2761         }
2762
2763         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2764                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2765                                                                 contextlen);
2766                 if (status)
2767                         goto out;
2768         }
2769
2770         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2771         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2772         status = nfs_ok;
2773
2774 out:
2775 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2776         if (context)
2777                 security_release_secctx(context, contextlen);
2778 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2779         kfree(acl);
2780         if (tempfh) {
2781                 fh_put(tempfh);
2782                 kfree(tempfh);
2783         }
2784         if (status)
2785                 xdr_truncate_encode(xdr, starting_len);
2786         return status;
2787 out_nfserr:
2788         status = nfserrno(err);
2789         goto out;
2790 out_resource:
2791         status = nfserr_resource;
2792         goto out;
2793 }
2794
2795 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2796                                 struct xdr_buf *buf, __be32 *p, int bytes)
2797 {
2798         xdr->scratch.iov_len = 0;
2799         memset(buf, 0, sizeof(struct xdr_buf));
2800         buf->head[0].iov_base = p;
2801         buf->head[0].iov_len = 0;
2802         buf->len = 0;
2803         xdr->buf = buf;
2804         xdr->iov = buf->head;
2805         xdr->p = p;
2806         xdr->end = (void *)p + bytes;
2807         buf->buflen = bytes;
2808 }
2809
2810 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2811                         struct svc_fh *fhp, struct svc_export *exp,
2812                         struct dentry *dentry, u32 *bmval,
2813                         struct svc_rqst *rqstp, int ignore_crossmnt)
2814 {
2815         struct xdr_buf dummy;
2816         struct xdr_stream xdr;
2817         __be32 ret;
2818
2819         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2820         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2821                                                         ignore_crossmnt);
2822         *p = xdr.p;
2823         return ret;
2824 }
2825
2826 static inline int attributes_need_mount(u32 *bmval)
2827 {
2828         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2829                 return 1;
2830         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2831                 return 1;
2832         return 0;
2833 }
2834
2835 static __be32
2836 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2837                         const char *name, int namlen)
2838 {
2839         struct svc_export *exp = cd->rd_fhp->fh_export;
2840         struct dentry *dentry;
2841         __be32 nfserr;
2842         int ignore_crossmnt = 0;
2843
2844         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2845         if (IS_ERR(dentry))
2846                 return nfserrno(PTR_ERR(dentry));
2847         if (d_really_is_negative(dentry)) {
2848                 /*
2849                  * nfsd_buffered_readdir drops the i_mutex between
2850                  * readdir and calling this callback, leaving a window
2851                  * where this directory entry could have gone away.
2852                  */
2853                 dput(dentry);
2854                 return nfserr_noent;
2855         }
2856
2857         exp_get(exp);
2858         /*
2859          * In the case of a mountpoint, the client may be asking for
2860          * attributes that are only properties of the underlying filesystem
2861          * as opposed to the cross-mounted file system. In such a case,
2862          * we will not follow the cross mount and will fill the attribtutes
2863          * directly from the mountpoint dentry.
2864          */
2865         if (nfsd_mountpoint(dentry, exp)) {
2866                 int err;
2867
2868                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2869                                 && !attributes_need_mount(cd->rd_bmval)) {
2870                         ignore_crossmnt = 1;
2871                         goto out_encode;
2872                 }
2873                 /*
2874                  * Why the heck aren't we just using nfsd_lookup??
2875                  * Different "."/".." handling?  Something else?
2876                  * At least, add a comment here to explain....
2877                  */
2878                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2879                 if (err) {
2880                         nfserr = nfserrno(err);
2881                         goto out_put;
2882                 }
2883                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2884                 if (nfserr)
2885                         goto out_put;
2886
2887         }
2888 out_encode:
2889         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2890                                         cd->rd_rqstp, ignore_crossmnt);
2891 out_put:
2892         dput(dentry);
2893         exp_put(exp);
2894         return nfserr;
2895 }
2896
2897 static __be32 *
2898 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2899 {
2900         __be32 *p;
2901
2902         p = xdr_reserve_space(xdr, 20);
2903         if (!p)
2904                 return NULL;
2905         *p++ = htonl(2);
2906         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2907         *p++ = htonl(0);                         /* bmval1 */
2908
2909         *p++ = htonl(4);     /* attribute length */
2910         *p++ = nfserr;       /* no htonl */
2911         return p;
2912 }
2913
2914 static int
2915 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2916                     loff_t offset, u64 ino, unsigned int d_type)
2917 {
2918         struct readdir_cd *ccd = ccdv;
2919         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2920         struct xdr_stream *xdr = cd->xdr;
2921         int start_offset = xdr->buf->len;
2922         int cookie_offset;
2923         u32 name_and_cookie;
2924         int entry_bytes;
2925         __be32 nfserr = nfserr_toosmall;
2926         __be64 wire_offset;
2927         __be32 *p;
2928
2929         /* In nfsv4, "." and ".." never make it onto the wire.. */
2930         if (name && isdotent(name, namlen)) {
2931                 cd->common.err = nfs_ok;
2932                 return 0;
2933         }
2934
2935         if (cd->cookie_offset) {
2936                 wire_offset = cpu_to_be64(offset);
2937                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2938                                                         &wire_offset, 8);
2939         }
2940
2941         p = xdr_reserve_space(xdr, 4);
2942         if (!p)
2943                 goto fail;
2944         *p++ = xdr_one;                             /* mark entry present */
2945         cookie_offset = xdr->buf->len;
2946         p = xdr_reserve_space(xdr, 3*4 + namlen);
2947         if (!p)
2948                 goto fail;
2949         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2950         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2951
2952         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2953         switch (nfserr) {
2954         case nfs_ok:
2955                 break;
2956         case nfserr_resource:
2957                 nfserr = nfserr_toosmall;
2958                 goto fail;
2959         case nfserr_noent:
2960                 xdr_truncate_encode(xdr, start_offset);
2961                 goto skip_entry;
2962         default:
2963                 /*
2964                  * If the client requested the RDATTR_ERROR attribute,
2965                  * we stuff the error code into this attribute
2966                  * and continue.  If this attribute was not requested,
2967                  * then in accordance with the spec, we fail the
2968                  * entire READDIR operation(!)
2969                  */
2970                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2971                         goto fail;
2972                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2973                 if (p == NULL) {
2974                         nfserr = nfserr_toosmall;
2975                         goto fail;
2976                 }
2977         }
2978         nfserr = nfserr_toosmall;
2979         entry_bytes = xdr->buf->len - start_offset;
2980         if (entry_bytes > cd->rd_maxcount)
2981                 goto fail;
2982         cd->rd_maxcount -= entry_bytes;
2983         /*
2984          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
2985          * let's always let through the first entry, at least:
2986          */
2987         if (!cd->rd_dircount)
2988                 goto fail;
2989         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
2990         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
2991                 goto fail;
2992         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
2993
2994         cd->cookie_offset = cookie_offset;
2995 skip_entry:
2996         cd->common.err = nfs_ok;
2997         return 0;
2998 fail:
2999         xdr_truncate_encode(xdr, start_offset);
3000         cd->common.err = nfserr;
3001         return -EINVAL;
3002 }
3003
3004 static __be32
3005 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3006 {
3007         __be32 *p;
3008
3009         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3010         if (!p)
3011                 return nfserr_resource;
3012         *p++ = cpu_to_be32(sid->si_generation);
3013         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3014                                         sizeof(stateid_opaque_t));
3015         return 0;
3016 }
3017
3018 static __be32
3019 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3020 {
3021         struct xdr_stream *xdr = &resp->xdr;
3022         __be32 *p;
3023
3024         if (!nfserr) {
3025                 p = xdr_reserve_space(xdr, 8);
3026                 if (!p)
3027                         return nfserr_resource;
3028                 *p++ = cpu_to_be32(access->ac_supported);
3029                 *p++ = cpu_to_be32(access->ac_resp_access);
3030         }
3031         return nfserr;
3032 }
3033
3034 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3035 {
3036         struct xdr_stream *xdr = &resp->xdr;
3037         __be32 *p;
3038
3039         if (!nfserr) {
3040                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3041                 if (!p)
3042                         return nfserr_resource;
3043                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3044                                                 NFS4_MAX_SESSIONID_LEN);
3045                 *p++ = cpu_to_be32(bcts->dir);
3046                 /* Sorry, we do not yet support RDMA over 4.1: */
3047                 *p++ = cpu_to_be32(0);
3048         }
3049         return nfserr;
3050 }
3051
3052 static __be32
3053 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3054 {
3055         struct xdr_stream *xdr = &resp->xdr;
3056
3057         if (!nfserr)
3058                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3059
3060         return nfserr;
3061 }
3062
3063
3064 static __be32
3065 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3066 {
3067         struct xdr_stream *xdr = &resp->xdr;
3068         __be32 *p;
3069
3070         if (!nfserr) {
3071                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3072                 if (!p)
3073                         return nfserr_resource;
3074                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3075                                                 NFS4_VERIFIER_SIZE);
3076         }
3077         return nfserr;
3078 }
3079
3080 static __be32
3081 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3082 {
3083         struct xdr_stream *xdr = &resp->xdr;
3084         __be32 *p;
3085
3086         if (!nfserr) {
3087                 p = xdr_reserve_space(xdr, 20);
3088                 if (!p)
3089                         return nfserr_resource;
3090                 encode_cinfo(p, &create->cr_cinfo);
3091                 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3092                                 create->cr_bmval[1], create->cr_bmval[2]);
3093         }
3094         return nfserr;
3095 }
3096
3097 static __be32
3098 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3099 {
3100         struct svc_fh *fhp = getattr->ga_fhp;
3101         struct xdr_stream *xdr = &resp->xdr;
3102
3103         if (nfserr)
3104                 return nfserr;
3105
3106         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3107                                     getattr->ga_bmval,
3108                                     resp->rqstp, 0);
3109         return nfserr;
3110 }
3111
3112 static __be32
3113 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3114 {
3115         struct xdr_stream *xdr = &resp->xdr;
3116         struct svc_fh *fhp = *fhpp;
3117         unsigned int len;
3118         __be32 *p;
3119
3120         if (!nfserr) {
3121                 len = fhp->fh_handle.fh_size;
3122                 p = xdr_reserve_space(xdr, len + 4);
3123                 if (!p)
3124                         return nfserr_resource;
3125                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3126         }
3127         return nfserr;
3128 }
3129
3130 /*
3131 * Including all fields other than the name, a LOCK4denied structure requires
3132 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3133 */
3134 static __be32
3135 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3136 {
3137         struct xdr_netobj *conf = &ld->ld_owner;
3138         __be32 *p;
3139
3140 again:
3141         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3142         if (!p) {
3143                 /*
3144                  * Don't fail to return the result just because we can't
3145                  * return the conflicting open:
3146                  */
3147                 if (conf->len) {
3148                         kfree(conf->data);
3149                         conf->len = 0;
3150                         conf->data = NULL;
3151                         goto again;
3152                 }
3153                 return nfserr_resource;
3154         }
3155         p = xdr_encode_hyper(p, ld->ld_start);
3156         p = xdr_encode_hyper(p, ld->ld_length);
3157         *p++ = cpu_to_be32(ld->ld_type);
3158         if (conf->len) {
3159                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3160                 p = xdr_encode_opaque(p, conf->data, conf->len);
3161                 kfree(conf->data);
3162         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3163                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3164                 *p++ = cpu_to_be32(0); /* length of owner name */
3165         }
3166         return nfserr_denied;
3167 }
3168
3169 static __be32
3170 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3171 {
3172         struct xdr_stream *xdr = &resp->xdr;
3173
3174         if (!nfserr)
3175                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3176         else if (nfserr == nfserr_denied)
3177                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3178
3179         return nfserr;
3180 }
3181
3182 static __be32
3183 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3184 {
3185         struct xdr_stream *xdr = &resp->xdr;
3186
3187         if (nfserr == nfserr_denied)
3188                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3189         return nfserr;
3190 }
3191
3192 static __be32
3193 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3194 {
3195         struct xdr_stream *xdr = &resp->xdr;
3196
3197         if (!nfserr)
3198                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3199
3200         return nfserr;
3201 }
3202
3203
3204 static __be32
3205 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3206 {
3207         struct xdr_stream *xdr = &resp->xdr;
3208         __be32 *p;
3209
3210         if (!nfserr) {
3211                 p = xdr_reserve_space(xdr, 20);
3212                 if (!p)
3213                         return nfserr_resource;
3214                 p = encode_cinfo(p, &link->li_cinfo);
3215         }
3216         return nfserr;
3217 }
3218
3219
3220 static __be32
3221 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3222 {
3223         struct xdr_stream *xdr = &resp->xdr;
3224         __be32 *p;
3225
3226         if (nfserr)
3227                 goto out;
3228
3229         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3230         if (nfserr)
3231                 goto out;
3232         p = xdr_reserve_space(xdr, 24);
3233         if (!p)
3234                 return nfserr_resource;
3235         p = encode_cinfo(p, &open->op_cinfo);
3236         *p++ = cpu_to_be32(open->op_rflags);
3237
3238         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3239                                         open->op_bmval[2]);
3240         if (nfserr)
3241                 goto out;
3242
3243         p = xdr_reserve_space(xdr, 4);
3244         if (!p)
3245                 return nfserr_resource;
3246
3247         *p++ = cpu_to_be32(open->op_delegate_type);
3248         switch (open->op_delegate_type) {
3249         case NFS4_OPEN_DELEGATE_NONE:
3250                 break;
3251         case NFS4_OPEN_DELEGATE_READ:
3252                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3253                 if (nfserr)
3254                         return nfserr;
3255                 p = xdr_reserve_space(xdr, 20);
3256                 if (!p)
3257                         return nfserr_resource;
3258                 *p++ = cpu_to_be32(open->op_recall);
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_WRITE:
3269                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3270                 if (nfserr)
3271                         return nfserr;
3272                 p = xdr_reserve_space(xdr, 32);
3273                 if (!p)
3274                         return nfserr_resource;
3275                 *p++ = cpu_to_be32(0);
3276
3277                 /*
3278                  * TODO: space_limit's in delegations
3279                  */
3280                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3281                 *p++ = cpu_to_be32(~(u32)0);
3282                 *p++ = cpu_to_be32(~(u32)0);
3283
3284                 /*
3285                  * TODO: ACE's in delegations
3286                  */
3287                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3288                 *p++ = cpu_to_be32(0);
3289                 *p++ = cpu_to_be32(0);
3290                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3291                 break;
3292         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3293                 switch (open->op_why_no_deleg) {
3294                 case WND4_CONTENTION:
3295                 case WND4_RESOURCE:
3296                         p = xdr_reserve_space(xdr, 8);
3297                         if (!p)
3298                                 return nfserr_resource;
3299                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3300                         /* deleg signaling not supported yet: */
3301                         *p++ = cpu_to_be32(0);
3302                         break;
3303                 default:
3304                         p = xdr_reserve_space(xdr, 4);
3305                         if (!p)
3306                                 return nfserr_resource;
3307                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3308                 }
3309                 break;
3310         default:
3311                 BUG();
3312         }
3313         /* XXX save filehandle here */
3314 out:
3315         return nfserr;
3316 }
3317
3318 static __be32
3319 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3320 {
3321         struct xdr_stream *xdr = &resp->xdr;
3322
3323         if (!nfserr)
3324                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3325
3326         return nfserr;
3327 }
3328
3329 static __be32
3330 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3331 {
3332         struct xdr_stream *xdr = &resp->xdr;
3333
3334         if (!nfserr)
3335                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3336
3337         return nfserr;
3338 }
3339
3340 static __be32 nfsd4_encode_splice_read(
3341                                 struct nfsd4_compoundres *resp,
3342                                 struct nfsd4_read *read,
3343                                 struct file *file, unsigned long maxcount)
3344 {
3345         struct xdr_stream *xdr = &resp->xdr;
3346         struct xdr_buf *buf = xdr->buf;
3347         u32 eof;
3348         int space_left;
3349         __be32 nfserr;
3350         __be32 *p = xdr->p - 2;
3351
3352         /* Make sure there will be room for padding if needed */
3353         if (xdr->end - xdr->p < 1)
3354                 return nfserr_resource;
3355
3356         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3357                                   read->rd_offset, &maxcount);
3358         if (nfserr) {
3359                 /*
3360                  * nfsd_splice_actor may have already messed with the
3361                  * page length; reset it so as not to confuse
3362                  * xdr_truncate_encode:
3363                  */
3364                 buf->page_len = 0;
3365                 return nfserr;
3366         }
3367
3368         eof = (read->rd_offset + maxcount >=
3369                d_inode(read->rd_fhp->fh_dentry)->i_size);
3370
3371         *(p++) = htonl(eof);
3372         *(p++) = htonl(maxcount);
3373
3374         buf->page_len = maxcount;
3375         buf->len += maxcount;
3376         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3377                                                         / PAGE_SIZE;
3378
3379         /* Use rest of head for padding and remaining ops: */
3380         buf->tail[0].iov_base = xdr->p;
3381         buf->tail[0].iov_len = 0;
3382         xdr->iov = buf->tail;
3383         if (maxcount&3) {
3384                 int pad = 4 - (maxcount&3);
3385
3386                 *(xdr->p++) = 0;
3387
3388                 buf->tail[0].iov_base += maxcount&3;
3389                 buf->tail[0].iov_len = pad;
3390                 buf->len += pad;
3391         }
3392
3393         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3394                                 buf->buflen - buf->len);
3395         buf->buflen = buf->len + space_left;
3396         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3397
3398         return 0;
3399 }
3400
3401 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3402                                  struct nfsd4_read *read,
3403                                  struct file *file, unsigned long maxcount)
3404 {
3405         struct xdr_stream *xdr = &resp->xdr;
3406         u32 eof;
3407         int v;
3408         int starting_len = xdr->buf->len - 8;
3409         long len;
3410         int thislen;
3411         __be32 nfserr;
3412         __be32 tmp;
3413         __be32 *p;
3414         u32 zzz = 0;
3415         int pad;
3416
3417         len = maxcount;
3418         v = 0;
3419
3420         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3421         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3422         WARN_ON_ONCE(!p);
3423         resp->rqstp->rq_vec[v].iov_base = p;
3424         resp->rqstp->rq_vec[v].iov_len = thislen;
3425         v++;
3426         len -= thislen;
3427
3428         while (len) {
3429                 thislen = min_t(long, len, PAGE_SIZE);
3430                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3431                 WARN_ON_ONCE(!p);
3432                 resp->rqstp->rq_vec[v].iov_base = p;
3433                 resp->rqstp->rq_vec[v].iov_len = thislen;
3434                 v++;
3435                 len -= thislen;
3436         }
3437         read->rd_vlen = v;
3438
3439         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3440                         read->rd_vlen, &maxcount);
3441         if (nfserr)
3442                 return nfserr;
3443         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3444
3445         eof = (read->rd_offset + maxcount >=
3446                d_inode(read->rd_fhp->fh_dentry)->i_size);
3447
3448         tmp = htonl(eof);
3449         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3450         tmp = htonl(maxcount);
3451         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3452
3453         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3454         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3455                                                                 &zzz, pad);
3456         return 0;
3457
3458 }
3459
3460 static __be32
3461 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3462                   struct nfsd4_read *read)
3463 {
3464         unsigned long maxcount;
3465         struct xdr_stream *xdr = &resp->xdr;
3466         struct file *file = read->rd_filp;
3467         int starting_len = xdr->buf->len;
3468         struct raparms *ra = NULL;
3469         __be32 *p;
3470
3471         if (nfserr)
3472                 goto out;
3473
3474         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3475         if (!p) {
3476                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3477                 nfserr = nfserr_resource;
3478                 goto out;
3479         }
3480         if (resp->xdr.buf->page_len &&
3481             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3482                 WARN_ON_ONCE(1);
3483                 nfserr = nfserr_resource;
3484                 goto out;
3485         }
3486         xdr_commit_encode(xdr);
3487
3488         maxcount = svc_max_payload(resp->rqstp);
3489         maxcount = min_t(unsigned long, maxcount,
3490                          (xdr->buf->buflen - xdr->buf->len));
3491         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3492
3493         if (read->rd_tmp_file)
3494                 ra = nfsd_init_raparms(file);
3495
3496         if (file->f_op->splice_read &&
3497             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3498                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3499         else
3500                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3501
3502         if (ra)
3503                 nfsd_put_raparams(file, ra);
3504
3505         if (nfserr)
3506                 xdr_truncate_encode(xdr, starting_len);
3507
3508 out:
3509         if (file)
3510                 fput(file);
3511         return nfserr;
3512 }
3513
3514 static __be32
3515 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3516 {
3517         int maxcount;
3518         __be32 wire_count;
3519         int zero = 0;
3520         struct xdr_stream *xdr = &resp->xdr;
3521         int length_offset = xdr->buf->len;
3522         __be32 *p;
3523
3524         if (nfserr)
3525                 return nfserr;
3526
3527         p = xdr_reserve_space(xdr, 4);
3528         if (!p)
3529                 return nfserr_resource;
3530         maxcount = PAGE_SIZE;
3531
3532         p = xdr_reserve_space(xdr, maxcount);
3533         if (!p)
3534                 return nfserr_resource;
3535         /*
3536          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3537          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3538          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3539          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3540          */
3541         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3542                                                 (char *)p, &maxcount);
3543         if (nfserr == nfserr_isdir)
3544                 nfserr = nfserr_inval;
3545         if (nfserr) {
3546                 xdr_truncate_encode(xdr, length_offset);
3547                 return nfserr;
3548         }
3549
3550         wire_count = htonl(maxcount);
3551         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3552         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3553         if (maxcount & 3)
3554                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3555                                                 &zero, 4 - (maxcount&3));
3556         return 0;
3557 }
3558
3559 static __be32
3560 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3561 {
3562         int maxcount;
3563         int bytes_left;
3564         loff_t offset;
3565         __be64 wire_offset;
3566         struct xdr_stream *xdr = &resp->xdr;
3567         int starting_len = xdr->buf->len;
3568         __be32 *p;
3569
3570         if (nfserr)
3571                 return nfserr;
3572
3573         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3574         if (!p)
3575                 return nfserr_resource;
3576
3577         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3578         *p++ = cpu_to_be32(0);
3579         *p++ = cpu_to_be32(0);
3580         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3581                                 - (char *)resp->xdr.buf->head[0].iov_base;
3582
3583         /*
3584          * Number of bytes left for directory entries allowing for the
3585          * final 8 bytes of the readdir and a following failed op:
3586          */
3587         bytes_left = xdr->buf->buflen - xdr->buf->len
3588                         - COMPOUND_ERR_SLACK_SPACE - 8;
3589         if (bytes_left < 0) {
3590                 nfserr = nfserr_resource;
3591                 goto err_no_verf;
3592         }
3593         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3594         /*
3595          * Note the rfc defines rd_maxcount as the size of the
3596          * READDIR4resok structure, which includes the verifier above
3597          * and the 8 bytes encoded at the end of this function:
3598          */
3599         if (maxcount < 16) {
3600                 nfserr = nfserr_toosmall;
3601                 goto err_no_verf;
3602         }
3603         maxcount = min_t(int, maxcount-16, bytes_left);
3604
3605         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3606         if (!readdir->rd_dircount)
3607                 readdir->rd_dircount = INT_MAX;
3608
3609         readdir->xdr = xdr;
3610         readdir->rd_maxcount = maxcount;
3611         readdir->common.err = 0;
3612         readdir->cookie_offset = 0;
3613
3614         offset = readdir->rd_cookie;
3615         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3616                               &offset,
3617                               &readdir->common, nfsd4_encode_dirent);
3618         if (nfserr == nfs_ok &&
3619             readdir->common.err == nfserr_toosmall &&
3620             xdr->buf->len == starting_len + 8) {
3621                 /* nothing encoded; which limit did we hit?: */
3622                 if (maxcount - 16 < bytes_left)
3623                         /* It was the fault of rd_maxcount: */
3624                         nfserr = nfserr_toosmall;
3625                 else
3626                         /* We ran out of buffer space: */
3627                         nfserr = nfserr_resource;
3628         }
3629         if (nfserr)
3630                 goto err_no_verf;
3631
3632         if (readdir->cookie_offset) {
3633                 wire_offset = cpu_to_be64(offset);
3634                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3635                                                         &wire_offset, 8);
3636         }
3637
3638         p = xdr_reserve_space(xdr, 8);
3639         if (!p) {
3640                 WARN_ON_ONCE(1);
3641                 goto err_no_verf;
3642         }
3643         *p++ = 0;       /* no more entries */
3644         *p++ = htonl(readdir->common.err == nfserr_eof);
3645
3646         return 0;
3647 err_no_verf:
3648         xdr_truncate_encode(xdr, starting_len);
3649         return nfserr;
3650 }
3651
3652 static __be32
3653 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3654 {
3655         struct xdr_stream *xdr = &resp->xdr;
3656         __be32 *p;
3657
3658         if (!nfserr) {
3659                 p = xdr_reserve_space(xdr, 20);
3660                 if (!p)
3661                         return nfserr_resource;
3662                 p = encode_cinfo(p, &remove->rm_cinfo);
3663         }
3664         return nfserr;
3665 }
3666
3667 static __be32
3668 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3669 {
3670         struct xdr_stream *xdr = &resp->xdr;
3671         __be32 *p;
3672
3673         if (!nfserr) {
3674                 p = xdr_reserve_space(xdr, 40);
3675                 if (!p)
3676                         return nfserr_resource;
3677                 p = encode_cinfo(p, &rename->rn_sinfo);
3678                 p = encode_cinfo(p, &rename->rn_tinfo);
3679         }
3680         return nfserr;
3681 }
3682
3683 static __be32
3684 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3685                          __be32 nfserr, struct svc_export *exp)
3686 {
3687         u32 i, nflavs, supported;
3688         struct exp_flavor_info *flavs;
3689         struct exp_flavor_info def_flavs[2];
3690         __be32 *p, *flavorsp;
3691         static bool report = true;
3692
3693         if (nfserr)
3694                 goto out;
3695         nfserr = nfserr_resource;
3696         if (exp->ex_nflavors) {
3697                 flavs = exp->ex_flavors;
3698                 nflavs = exp->ex_nflavors;
3699         } else { /* Handling of some defaults in absence of real secinfo: */
3700                 flavs = def_flavs;
3701                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3702                         nflavs = 2;
3703                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3704                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3705                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3706                         nflavs = 1;
3707                         flavs[0].pseudoflavor
3708                                         = svcauth_gss_flavor(exp->ex_client);
3709                 } else {
3710                         nflavs = 1;
3711                         flavs[0].pseudoflavor
3712                                         = exp->ex_client->flavour->flavour;
3713                 }
3714         }
3715
3716         supported = 0;
3717         p = xdr_reserve_space(xdr, 4);
3718         if (!p)
3719                 goto out;
3720         flavorsp = p++;         /* to be backfilled later */
3721
3722         for (i = 0; i < nflavs; i++) {
3723                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3724                 struct rpcsec_gss_info info;
3725
3726                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3727                         supported++;
3728                         p = xdr_reserve_space(xdr, 4 + 4 +
3729                                               XDR_LEN(info.oid.len) + 4 + 4);
3730                         if (!p)
3731                                 goto out;
3732                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3733                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3734                         *p++ = cpu_to_be32(info.qop);
3735                         *p++ = cpu_to_be32(info.service);
3736                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3737                         supported++;
3738                         p = xdr_reserve_space(xdr, 4);
3739                         if (!p)
3740                                 goto out;
3741                         *p++ = cpu_to_be32(pf);
3742                 } else {
3743                         if (report)
3744                                 pr_warn("NFS: SECINFO: security flavor %u "
3745                                         "is not supported\n", pf);
3746                 }
3747         }
3748
3749         if (nflavs != supported)
3750                 report = false;
3751         *flavorsp = htonl(supported);
3752         nfserr = 0;
3753 out:
3754         if (exp)
3755                 exp_put(exp);
3756         return nfserr;
3757 }
3758
3759 static __be32
3760 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3761                      struct nfsd4_secinfo *secinfo)
3762 {
3763         struct xdr_stream *xdr = &resp->xdr;
3764
3765         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3766 }
3767
3768 static __be32
3769 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3770                      struct nfsd4_secinfo_no_name *secinfo)
3771 {
3772         struct xdr_stream *xdr = &resp->xdr;
3773
3774         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3775 }
3776
3777 /*
3778  * The SETATTR encode routine is special -- it always encodes a bitmap,
3779  * regardless of the error status.
3780  */
3781 static __be32
3782 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3783 {
3784         struct xdr_stream *xdr = &resp->xdr;
3785         __be32 *p;
3786
3787         p = xdr_reserve_space(xdr, 16);
3788         if (!p)
3789                 return nfserr_resource;
3790         if (nfserr) {
3791                 *p++ = cpu_to_be32(3);
3792                 *p++ = cpu_to_be32(0);
3793                 *p++ = cpu_to_be32(0);
3794                 *p++ = cpu_to_be32(0);
3795         }
3796         else {
3797                 *p++ = cpu_to_be32(3);
3798                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3799                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3800                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3801         }
3802         return nfserr;
3803 }
3804
3805 static __be32
3806 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3807 {
3808         struct xdr_stream *xdr = &resp->xdr;
3809         __be32 *p;
3810
3811         if (!nfserr) {
3812                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3813                 if (!p)
3814                         return nfserr_resource;
3815                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3816                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3817                                                 NFS4_VERIFIER_SIZE);
3818         }
3819         else if (nfserr == nfserr_clid_inuse) {
3820                 p = xdr_reserve_space(xdr, 8);
3821                 if (!p)
3822                         return nfserr_resource;
3823                 *p++ = cpu_to_be32(0);
3824                 *p++ = cpu_to_be32(0);
3825         }
3826         return nfserr;
3827 }
3828
3829 static __be32
3830 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3831 {
3832         struct xdr_stream *xdr = &resp->xdr;
3833         __be32 *p;
3834
3835         if (!nfserr) {
3836                 p = xdr_reserve_space(xdr, 16);
3837                 if (!p)
3838                         return nfserr_resource;
3839                 *p++ = cpu_to_be32(write->wr_bytes_written);
3840                 *p++ = cpu_to_be32(write->wr_how_written);
3841                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3842                                                         NFS4_VERIFIER_SIZE);
3843         }
3844         return nfserr;
3845 }
3846
3847 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3848         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3849               1 << (OP_EXCHANGE_ID - 32) |
3850               1 << (OP_CREATE_SESSION - 32) |
3851               1 << (OP_DESTROY_SESSION - 32) |
3852               1 << (OP_DESTROY_CLIENTID - 32)
3853 };
3854
3855 static __be32
3856 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3857                          struct nfsd4_exchange_id *exid)
3858 {
3859         struct xdr_stream *xdr = &resp->xdr;
3860         __be32 *p;
3861         char *major_id;
3862         char *server_scope;
3863         int major_id_sz;
3864         int server_scope_sz;
3865         uint64_t minor_id = 0;
3866
3867         if (nfserr)
3868                 return nfserr;
3869
3870         major_id = utsname()->nodename;
3871         major_id_sz = strlen(major_id);
3872         server_scope = utsname()->nodename;
3873         server_scope_sz = strlen(server_scope);
3874
3875         p = xdr_reserve_space(xdr,
3876                 8 /* eir_clientid */ +
3877                 4 /* eir_sequenceid */ +
3878                 4 /* eir_flags */ +
3879                 4 /* spr_how */);
3880         if (!p)
3881                 return nfserr_resource;
3882
3883         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3884         *p++ = cpu_to_be32(exid->seqid);
3885         *p++ = cpu_to_be32(exid->flags);
3886
3887         *p++ = cpu_to_be32(exid->spa_how);
3888
3889         switch (exid->spa_how) {
3890         case SP4_NONE:
3891                 break;
3892         case SP4_MACH_CRED:
3893                 /* spo_must_enforce, spo_must_allow */
3894                 p = xdr_reserve_space(xdr, 16);
3895                 if (!p)
3896                         return nfserr_resource;
3897
3898                 /* spo_must_enforce bitmap: */
3899                 *p++ = cpu_to_be32(2);
3900                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3901                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3902                 /* empty spo_must_allow bitmap: */
3903                 *p++ = cpu_to_be32(0);
3904
3905                 break;
3906         default:
3907                 WARN_ON_ONCE(1);
3908         }
3909
3910         p = xdr_reserve_space(xdr,
3911                 8 /* so_minor_id */ +
3912                 4 /* so_major_id.len */ +
3913                 (XDR_QUADLEN(major_id_sz) * 4) +
3914                 4 /* eir_server_scope.len */ +
3915                 (XDR_QUADLEN(server_scope_sz) * 4) +
3916                 4 /* eir_server_impl_id.count (0) */);
3917         if (!p)
3918                 return nfserr_resource;
3919
3920         /* The server_owner struct */
3921         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3922         /* major id */
3923         p = xdr_encode_opaque(p, major_id, major_id_sz);
3924
3925         /* Server scope */
3926         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3927
3928         /* Implementation id */
3929         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3930         return 0;
3931 }
3932
3933 static __be32
3934 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3935                             struct nfsd4_create_session *sess)
3936 {
3937         struct xdr_stream *xdr = &resp->xdr;
3938         __be32 *p;
3939
3940         if (nfserr)
3941                 return nfserr;
3942
3943         p = xdr_reserve_space(xdr, 24);
3944         if (!p)
3945                 return nfserr_resource;
3946         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3947                                         NFS4_MAX_SESSIONID_LEN);
3948         *p++ = cpu_to_be32(sess->seqid);
3949         *p++ = cpu_to_be32(sess->flags);
3950
3951         p = xdr_reserve_space(xdr, 28);
3952         if (!p)
3953                 return nfserr_resource;
3954         *p++ = cpu_to_be32(0); /* headerpadsz */
3955         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3956         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3957         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3958         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3959         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3960         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3961
3962         if (sess->fore_channel.nr_rdma_attrs) {
3963                 p = xdr_reserve_space(xdr, 4);
3964                 if (!p)
3965                         return nfserr_resource;
3966                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3967         }
3968
3969         p = xdr_reserve_space(xdr, 28);
3970         if (!p)
3971                 return nfserr_resource;
3972         *p++ = cpu_to_be32(0); /* headerpadsz */
3973         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3974         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3975         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3976         *p++ = cpu_to_be32(sess->back_channel.maxops);
3977         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3978         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3979
3980         if (sess->back_channel.nr_rdma_attrs) {
3981                 p = xdr_reserve_space(xdr, 4);
3982                 if (!p)
3983                         return nfserr_resource;
3984                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3985         }
3986         return 0;
3987 }
3988
3989 static __be32
3990 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3991                       struct nfsd4_sequence *seq)
3992 {
3993         struct xdr_stream *xdr = &resp->xdr;
3994         __be32 *p;
3995
3996         if (nfserr)
3997                 return nfserr;
3998
3999         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4000         if (!p)
4001                 return nfserr_resource;
4002         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4003                                         NFS4_MAX_SESSIONID_LEN);
4004         *p++ = cpu_to_be32(seq->seqid);
4005         *p++ = cpu_to_be32(seq->slotid);
4006         /* Note slotid's are numbered from zero: */
4007         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4008         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4009         *p++ = cpu_to_be32(seq->status_flags);
4010
4011         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4012         return 0;
4013 }
4014
4015 static __be32
4016 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4017                           struct nfsd4_test_stateid *test_stateid)
4018 {
4019         struct xdr_stream *xdr = &resp->xdr;
4020         struct nfsd4_test_stateid_id *stateid, *next;
4021         __be32 *p;
4022
4023         if (nfserr)
4024                 return nfserr;
4025
4026         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4027         if (!p)
4028                 return nfserr_resource;
4029         *p++ = htonl(test_stateid->ts_num_ids);
4030
4031         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4032                 *p++ = stateid->ts_id_status;
4033         }
4034
4035         return nfserr;
4036 }
4037
4038 #ifdef CONFIG_NFSD_PNFS
4039 static __be32
4040 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4041                 struct nfsd4_getdeviceinfo *gdev)
4042 {
4043         struct xdr_stream *xdr = &resp->xdr;
4044         const struct nfsd4_layout_ops *ops =
4045                 nfsd4_layout_ops[gdev->gd_layout_type];
4046         u32 starting_len = xdr->buf->len, needed_len;
4047         __be32 *p;
4048
4049         dprintk("%s: err %d\n", __func__, nfserr);
4050         if (nfserr)
4051                 goto out;
4052
4053         nfserr = nfserr_resource;
4054         p = xdr_reserve_space(xdr, 4);
4055         if (!p)
4056                 goto out;
4057
4058         *p++ = cpu_to_be32(gdev->gd_layout_type);
4059
4060         /* If maxcount is 0 then just update notifications */
4061         if (gdev->gd_maxcount != 0) {
4062                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4063                 if (nfserr) {
4064                         /*
4065                          * We don't bother to burden the layout drivers with
4066                          * enforcing gd_maxcount, just tell the client to
4067                          * come back with a bigger buffer if it's not enough.
4068                          */
4069                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4070                                 goto toosmall;
4071                         goto out;
4072                 }
4073         }
4074
4075         nfserr = nfserr_resource;
4076         if (gdev->gd_notify_types) {
4077                 p = xdr_reserve_space(xdr, 4 + 4);
4078                 if (!p)
4079                         goto out;
4080                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4081                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4082         } else {
4083                 p = xdr_reserve_space(xdr, 4);
4084                 if (!p)
4085                         goto out;
4086                 *p++ = 0;
4087         }
4088
4089         nfserr = 0;
4090 out:
4091         kfree(gdev->gd_device);
4092         dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4093         return nfserr;
4094
4095 toosmall:
4096         dprintk("%s: maxcount too small\n", __func__);
4097         needed_len = xdr->buf->len + 4 /* notifications */;
4098         xdr_truncate_encode(xdr, starting_len);
4099         p = xdr_reserve_space(xdr, 4);
4100         if (!p) {
4101                 nfserr = nfserr_resource;
4102         } else {
4103                 *p++ = cpu_to_be32(needed_len);
4104                 nfserr = nfserr_toosmall;
4105         }
4106         goto out;
4107 }
4108
4109 static __be32
4110 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4111                 struct nfsd4_layoutget *lgp)
4112 {
4113         struct xdr_stream *xdr = &resp->xdr;
4114         const struct nfsd4_layout_ops *ops =
4115                 nfsd4_layout_ops[lgp->lg_layout_type];
4116         __be32 *p;
4117
4118         dprintk("%s: err %d\n", __func__, nfserr);
4119         if (nfserr)
4120                 goto out;
4121
4122         nfserr = nfserr_resource;
4123         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4124         if (!p)
4125                 goto out;
4126
4127         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4128         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4129         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4130                                     sizeof(stateid_opaque_t));
4131
4132         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4133         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4134         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4135         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4136         *p++ = cpu_to_be32(lgp->lg_layout_type);
4137
4138         nfserr = ops->encode_layoutget(xdr, lgp);
4139 out:
4140         kfree(lgp->lg_content);
4141         return nfserr;
4142 }
4143
4144 static __be32
4145 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4146                           struct nfsd4_layoutcommit *lcp)
4147 {
4148         struct xdr_stream *xdr = &resp->xdr;
4149         __be32 *p;
4150
4151         if (nfserr)
4152                 return nfserr;
4153
4154         p = xdr_reserve_space(xdr, 4);
4155         if (!p)
4156                 return nfserr_resource;
4157         *p++ = cpu_to_be32(lcp->lc_size_chg);
4158         if (lcp->lc_size_chg) {
4159                 p = xdr_reserve_space(xdr, 8);
4160                 if (!p)
4161                         return nfserr_resource;
4162                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4163         }
4164
4165         return nfs_ok;
4166 }
4167
4168 static __be32
4169 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4170                 struct nfsd4_layoutreturn *lrp)
4171 {
4172         struct xdr_stream *xdr = &resp->xdr;
4173         __be32 *p;
4174
4175         if (nfserr)
4176                 return nfserr;
4177
4178         p = xdr_reserve_space(xdr, 4);
4179         if (!p)
4180                 return nfserr_resource;
4181         *p++ = cpu_to_be32(lrp->lrs_present);
4182         if (lrp->lrs_present)
4183                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4184         return nfs_ok;
4185 }
4186 #endif /* CONFIG_NFSD_PNFS */
4187
4188 static __be32
4189 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4190                   struct nfsd4_seek *seek)
4191 {
4192         __be32 *p;
4193
4194         if (nfserr)
4195                 return nfserr;
4196
4197         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4198         *p++ = cpu_to_be32(seek->seek_eof);
4199         p = xdr_encode_hyper(p, seek->seek_pos);
4200
4201         return nfserr;
4202 }
4203
4204 static __be32
4205 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4206 {
4207         return nfserr;
4208 }
4209
4210 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4211
4212 /*
4213  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4214  * since we don't need to filter out obsolete ops as this is
4215  * done in the decoding phase.
4216  */
4217 static nfsd4_enc nfsd4_enc_ops[] = {
4218         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4219         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4220         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4221         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4222         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4223         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4224         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4225         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4226         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4227         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4228         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4229         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4230         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4231         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4232         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4233         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4234         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4235         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4236         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4237         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4238         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4239         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4240         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4241         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4242         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4243         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4244         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4245         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4246         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4247         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4248         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4249         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4250         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4251         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4252         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4253         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4254         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4255
4256         /* NFSv4.1 operations */
4257         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4258         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4259         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4260         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4261         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4262         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4263         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4264 #ifdef CONFIG_NFSD_PNFS
4265         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4266         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4267         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4268         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4269         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4270 #else
4271         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4272         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4273         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4274         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4275         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4276 #endif
4277         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4278         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4279         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4280         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4281         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4282         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4283         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4284
4285         /* NFSv4.2 operations */
4286         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4287         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_noop,
4288         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4289         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4290         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4291         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4292         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4293         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4294         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4295         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4296         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4297         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4298 };
4299
4300 /*
4301  * Calculate whether we still have space to encode repsize bytes.
4302  * There are two considerations:
4303  *     - For NFS versions >=4.1, the size of the reply must stay within
4304  *       session limits
4305  *     - For all NFS versions, we must stay within limited preallocated
4306  *       buffer space.
4307  *
4308  * This is called before the operation is processed, so can only provide
4309  * an upper estimate.  For some nonidempotent operations (such as
4310  * getattr), it's not necessarily a problem if that estimate is wrong,
4311  * as we can fail it after processing without significant side effects.
4312  */
4313 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4314 {
4315         struct xdr_buf *buf = &resp->rqstp->rq_res;
4316         struct nfsd4_slot *slot = resp->cstate.slot;
4317
4318         if (buf->len + respsize <= buf->buflen)
4319                 return nfs_ok;
4320         if (!nfsd4_has_session(&resp->cstate))
4321                 return nfserr_resource;
4322         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4323                 WARN_ON_ONCE(1);
4324                 return nfserr_rep_too_big_to_cache;
4325         }
4326         return nfserr_rep_too_big;
4327 }
4328
4329 void
4330 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4331 {
4332         struct xdr_stream *xdr = &resp->xdr;
4333         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4334         struct svc_rqst *rqstp = resp->rqstp;
4335         int post_err_offset;
4336         nfsd4_enc encoder;
4337         __be32 *p;
4338
4339         p = xdr_reserve_space(xdr, 8);
4340         if (!p) {
4341                 WARN_ON_ONCE(1);
4342                 return;
4343         }
4344         *p++ = cpu_to_be32(op->opnum);
4345         post_err_offset = xdr->buf->len;
4346
4347         if (op->opnum == OP_ILLEGAL)
4348                 goto status;
4349         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4350                !nfsd4_enc_ops[op->opnum]);
4351         encoder = nfsd4_enc_ops[op->opnum];
4352         op->status = encoder(resp, op->status, &op->u);
4353         xdr_commit_encode(xdr);
4354
4355         /* nfsd4_check_resp_size guarantees enough room for error status */
4356         if (!op->status) {
4357                 int space_needed = 0;
4358                 if (!nfsd4_last_compound_op(rqstp))
4359                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4360                 op->status = nfsd4_check_resp_size(resp, space_needed);
4361         }
4362         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4363                 struct nfsd4_slot *slot = resp->cstate.slot;
4364
4365                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4366                         op->status = nfserr_rep_too_big_to_cache;
4367                 else
4368                         op->status = nfserr_rep_too_big;
4369         }
4370         if (op->status == nfserr_resource ||
4371             op->status == nfserr_rep_too_big ||
4372             op->status == nfserr_rep_too_big_to_cache) {
4373                 /*
4374                  * The operation may have already been encoded or
4375                  * partially encoded.  No op returns anything additional
4376                  * in the case of one of these three errors, so we can
4377                  * just truncate back to after the status.  But it's a
4378                  * bug if we had to do this on a non-idempotent op:
4379                  */
4380                 warn_on_nonidempotent_op(op);
4381                 xdr_truncate_encode(xdr, post_err_offset);
4382         }
4383         if (so) {
4384                 int len = xdr->buf->len - post_err_offset;
4385
4386                 so->so_replay.rp_status = op->status;
4387                 so->so_replay.rp_buflen = len;
4388                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4389                                                 so->so_replay.rp_buf, len);
4390         }
4391 status:
4392         /* Note that op->status is already in network byte order: */
4393         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4394 }
4395
4396 /*
4397  * Encode the reply stored in the stateowner reply cache
4398  *
4399  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4400  * previously sent already encoded operation.
4401  */
4402 void
4403 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4404 {
4405         __be32 *p;
4406         struct nfs4_replay *rp = op->replay;
4407
4408         BUG_ON(!rp);
4409
4410         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4411         if (!p) {
4412                 WARN_ON_ONCE(1);
4413                 return;
4414         }
4415         *p++ = cpu_to_be32(op->opnum);
4416         *p++ = rp->rp_status;  /* already xdr'ed */
4417
4418         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4419 }
4420
4421 int
4422 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4423 {
4424         return xdr_ressize_check(rqstp, p);
4425 }
4426
4427 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4428 {
4429         struct svc_rqst *rqstp = rq;
4430         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4431
4432         if (args->ops != args->iops) {
4433                 kfree(args->ops);
4434                 args->ops = args->iops;
4435         }
4436         kfree(args->tmpp);
4437         args->tmpp = NULL;
4438         while (args->to_free) {
4439                 struct svcxdr_tmpbuf *tb = args->to_free;
4440                 args->to_free = tb->next;
4441                 kfree(tb);
4442         }
4443         return 1;
4444 }
4445
4446 int
4447 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4448 {
4449         if (rqstp->rq_arg.head[0].iov_len % 4) {
4450                 /* client is nuts */
4451                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4452                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4453                 return 0;
4454         }
4455         args->p = p;
4456         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4457         args->pagelist = rqstp->rq_arg.pages;
4458         args->pagelen = rqstp->rq_arg.page_len;
4459         args->tmpp = NULL;
4460         args->to_free = NULL;
4461         args->ops = args->iops;
4462         args->rqstp = rqstp;
4463
4464         return !nfsd4_decode_compound(args);
4465 }
4466
4467 int
4468 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4469 {
4470         /*
4471          * All that remains is to write the tag and operation count...
4472          */
4473         struct xdr_buf *buf = resp->xdr.buf;
4474
4475         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4476                                  buf->tail[0].iov_len);
4477
4478         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4479
4480         p = resp->tagp;
4481         *p++ = htonl(resp->taglen);
4482         memcpy(p, resp->tag, resp->taglen);
4483         p += XDR_QUADLEN(resp->taglen);
4484         *p++ = htonl(resp->opcnt);
4485
4486         nfsd4_sequence_done(resp);
4487         return 1;
4488 }
4489
4490 /*
4491  * Local variables:
4492  *  c-basic-offset: 8
4493  * End:
4494  */