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 + XDR_QUADLEN(argp->pagelen);
 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                 next_decode_page(argp);
1250         }
1251         argp->p += XDR_QUADLEN(len);
1252
1253         DECODE_TAIL;
1254 }
1255
1256 static __be32
1257 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1258 {
1259         DECODE_HEAD;
1260
1261         if (argp->minorversion >= 1)
1262                 return nfserr_notsupp;
1263
1264         READ_BUF(12);
1265         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1266         rlockowner->rl_owner.len = be32_to_cpup(p++);
1267         READ_BUF(rlockowner->rl_owner.len);
1268         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1269
1270         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1271                 return nfserr_inval;
1272         DECODE_TAIL;
1273 }
1274
1275 static __be32
1276 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1277                          struct nfsd4_exchange_id *exid)
1278 {
1279         int dummy, tmp;
1280         DECODE_HEAD;
1281
1282         READ_BUF(NFS4_VERIFIER_SIZE);
1283         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1284
1285         status = nfsd4_decode_opaque(argp, &exid->clname);
1286         if (status)
1287                 return nfserr_bad_xdr;
1288
1289         READ_BUF(4);
1290         exid->flags = be32_to_cpup(p++);
1291
1292         /* Ignore state_protect4_a */
1293         READ_BUF(4);
1294         exid->spa_how = be32_to_cpup(p++);
1295         switch (exid->spa_how) {
1296         case SP4_NONE:
1297                 break;
1298         case SP4_MACH_CRED:
1299                 /* spo_must_enforce */
1300                 READ_BUF(4);
1301                 dummy = be32_to_cpup(p++);
1302                 READ_BUF(dummy * 4);
1303                 p += dummy;
1304
1305                 /* spo_must_allow */
1306                 READ_BUF(4);
1307                 dummy = be32_to_cpup(p++);
1308                 READ_BUF(dummy * 4);
1309                 p += dummy;
1310                 break;
1311         case SP4_SSV:
1312                 /* ssp_ops */
1313                 READ_BUF(4);
1314                 dummy = be32_to_cpup(p++);
1315                 READ_BUF(dummy * 4);
1316                 p += dummy;
1317
1318                 READ_BUF(4);
1319                 dummy = be32_to_cpup(p++);
1320                 READ_BUF(dummy * 4);
1321                 p += dummy;
1322
1323                 /* ssp_hash_algs<> */
1324                 READ_BUF(4);
1325                 tmp = be32_to_cpup(p++);
1326                 while (tmp--) {
1327                         READ_BUF(4);
1328                         dummy = be32_to_cpup(p++);
1329                         READ_BUF(dummy);
1330                         p += XDR_QUADLEN(dummy);
1331                 }
1332
1333                 /* ssp_encr_algs<> */
1334                 READ_BUF(4);
1335                 tmp = be32_to_cpup(p++);
1336                 while (tmp--) {
1337                         READ_BUF(4);
1338                         dummy = be32_to_cpup(p++);
1339                         READ_BUF(dummy);
1340                         p += XDR_QUADLEN(dummy);
1341                 }
1342
1343                 /* ssp_window and ssp_num_gss_handles */
1344                 READ_BUF(8);
1345                 dummy = be32_to_cpup(p++);
1346                 dummy = be32_to_cpup(p++);
1347                 break;
1348         default:
1349                 goto xdr_error;
1350         }
1351
1352         /* Ignore Implementation ID */
1353         READ_BUF(4);    /* nfs_impl_id4 array length */
1354         dummy = be32_to_cpup(p++);
1355
1356         if (dummy > 1)
1357                 goto xdr_error;
1358
1359         if (dummy == 1) {
1360                 /* nii_domain */
1361                 READ_BUF(4);
1362                 dummy = be32_to_cpup(p++);
1363                 READ_BUF(dummy);
1364                 p += XDR_QUADLEN(dummy);
1365
1366                 /* nii_name */
1367                 READ_BUF(4);
1368                 dummy = be32_to_cpup(p++);
1369                 READ_BUF(dummy);
1370                 p += XDR_QUADLEN(dummy);
1371
1372                 /* nii_date */
1373                 READ_BUF(12);
1374                 p += 3;
1375         }
1376         DECODE_TAIL;
1377 }
1378
1379 static __be32
1380 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1381                             struct nfsd4_create_session *sess)
1382 {
1383         DECODE_HEAD;
1384         u32 dummy;
1385
1386         READ_BUF(16);
1387         COPYMEM(&sess->clientid, 8);
1388         sess->seqid = be32_to_cpup(p++);
1389         sess->flags = be32_to_cpup(p++);
1390
1391         /* Fore channel attrs */
1392         READ_BUF(28);
1393         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1394         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1395         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1396         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1397         sess->fore_channel.maxops = be32_to_cpup(p++);
1398         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1399         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1400         if (sess->fore_channel.nr_rdma_attrs == 1) {
1401                 READ_BUF(4);
1402                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1403         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1404                 dprintk("Too many fore channel attr bitmaps!\n");
1405                 goto xdr_error;
1406         }
1407
1408         /* Back channel attrs */
1409         READ_BUF(28);
1410         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1411         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1412         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1413         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1414         sess->back_channel.maxops = be32_to_cpup(p++);
1415         sess->back_channel.maxreqs = be32_to_cpup(p++);
1416         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1417         if (sess->back_channel.nr_rdma_attrs == 1) {
1418                 READ_BUF(4);
1419                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1420         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1421                 dprintk("Too many back channel attr bitmaps!\n");
1422                 goto xdr_error;
1423         }
1424
1425         READ_BUF(4);
1426         sess->callback_prog = be32_to_cpup(p++);
1427         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1428         DECODE_TAIL;
1429 }
1430
1431 static __be32
1432 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1433                              struct nfsd4_destroy_session *destroy_session)
1434 {
1435         DECODE_HEAD;
1436         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1437         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1438
1439         DECODE_TAIL;
1440 }
1441
1442 static __be32
1443 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1444                           struct nfsd4_free_stateid *free_stateid)
1445 {
1446         DECODE_HEAD;
1447
1448         READ_BUF(sizeof(stateid_t));
1449         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1450         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1451
1452         DECODE_TAIL;
1453 }
1454
1455 static __be32
1456 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1457                       struct nfsd4_sequence *seq)
1458 {
1459         DECODE_HEAD;
1460
1461         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1462         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1463         seq->seqid = be32_to_cpup(p++);
1464         seq->slotid = be32_to_cpup(p++);
1465         seq->maxslots = be32_to_cpup(p++);
1466         seq->cachethis = be32_to_cpup(p++);
1467
1468         DECODE_TAIL;
1469 }
1470
1471 static __be32
1472 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1473 {
1474         int i;
1475         __be32 *p, status;
1476         struct nfsd4_test_stateid_id *stateid;
1477
1478         READ_BUF(4);
1479         test_stateid->ts_num_ids = ntohl(*p++);
1480
1481         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1482
1483         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1484                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1485                 if (!stateid) {
1486                         status = nfserrno(-ENOMEM);
1487                         goto out;
1488                 }
1489
1490                 INIT_LIST_HEAD(&stateid->ts_id_list);
1491                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1492
1493                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1494                 if (status)
1495                         goto out;
1496         }
1497
1498         status = 0;
1499 out:
1500         return status;
1501 xdr_error:
1502         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1503         status = nfserr_bad_xdr;
1504         goto out;
1505 }
1506
1507 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1508 {
1509         DECODE_HEAD;
1510
1511         READ_BUF(8);
1512         COPYMEM(&dc->clientid, 8);
1513
1514         DECODE_TAIL;
1515 }
1516
1517 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1518 {
1519         DECODE_HEAD;
1520
1521         READ_BUF(4);
1522         rc->rca_one_fs = be32_to_cpup(p++);
1523
1524         DECODE_TAIL;
1525 }
1526
1527 #ifdef CONFIG_NFSD_PNFS
1528 static __be32
1529 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1530                 struct nfsd4_getdeviceinfo *gdev)
1531 {
1532         DECODE_HEAD;
1533         u32 num, i;
1534
1535         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1536         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1537         gdev->gd_layout_type = be32_to_cpup(p++);
1538         gdev->gd_maxcount = be32_to_cpup(p++);
1539         num = be32_to_cpup(p++);
1540         if (num) {
1541                 if (num > 1000)
1542                         goto xdr_error;
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                 u32 supp[3];
2757
2758                 supp[0] = nfsd_suppattrs0(minorversion);
2759                 supp[1] = nfsd_suppattrs1(minorversion);
2760                 supp[2] = nfsd_suppattrs2(minorversion);
2761                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2762                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2763                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2764
2765                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2766                 if (status)
2767                         goto out;
2768         }
2769
2770         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2771                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2772                                                                 contextlen);
2773                 if (status)
2774                         goto out;
2775         }
2776
2777         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2778         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2779         status = nfs_ok;
2780
2781 out:
2782 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2783         if (context)
2784                 security_release_secctx(context, contextlen);
2785 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2786         kfree(acl);
2787         if (tempfh) {
2788                 fh_put(tempfh);
2789                 kfree(tempfh);
2790         }
2791         if (status)
2792                 xdr_truncate_encode(xdr, starting_len);
2793         return status;
2794 out_nfserr:
2795         status = nfserrno(err);
2796         goto out;
2797 out_resource:
2798         status = nfserr_resource;
2799         goto out;
2800 }
2801
2802 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2803                                 struct xdr_buf *buf, __be32 *p, int bytes)
2804 {
2805         xdr->scratch.iov_len = 0;
2806         memset(buf, 0, sizeof(struct xdr_buf));
2807         buf->head[0].iov_base = p;
2808         buf->head[0].iov_len = 0;
2809         buf->len = 0;
2810         xdr->buf = buf;
2811         xdr->iov = buf->head;
2812         xdr->p = p;
2813         xdr->end = (void *)p + bytes;
2814         buf->buflen = bytes;
2815 }
2816
2817 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2818                         struct svc_fh *fhp, struct svc_export *exp,
2819                         struct dentry *dentry, u32 *bmval,
2820                         struct svc_rqst *rqstp, int ignore_crossmnt)
2821 {
2822         struct xdr_buf dummy;
2823         struct xdr_stream xdr;
2824         __be32 ret;
2825
2826         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2827         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2828                                                         ignore_crossmnt);
2829         *p = xdr.p;
2830         return ret;
2831 }
2832
2833 static inline int attributes_need_mount(u32 *bmval)
2834 {
2835         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2836                 return 1;
2837         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2838                 return 1;
2839         return 0;
2840 }
2841
2842 static __be32
2843 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2844                         const char *name, int namlen)
2845 {
2846         struct svc_export *exp = cd->rd_fhp->fh_export;
2847         struct dentry *dentry;
2848         __be32 nfserr;
2849         int ignore_crossmnt = 0;
2850
2851         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2852         if (IS_ERR(dentry))
2853                 return nfserrno(PTR_ERR(dentry));
2854         if (d_really_is_negative(dentry)) {
2855                 /*
2856                  * nfsd_buffered_readdir drops the i_mutex between
2857                  * readdir and calling this callback, leaving a window
2858                  * where this directory entry could have gone away.
2859                  */
2860                 dput(dentry);
2861                 return nfserr_noent;
2862         }
2863
2864         exp_get(exp);
2865         /*
2866          * In the case of a mountpoint, the client may be asking for
2867          * attributes that are only properties of the underlying filesystem
2868          * as opposed to the cross-mounted file system. In such a case,
2869          * we will not follow the cross mount and will fill the attribtutes
2870          * directly from the mountpoint dentry.
2871          */
2872         if (nfsd_mountpoint(dentry, exp)) {
2873                 int err;
2874
2875                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2876                                 && !attributes_need_mount(cd->rd_bmval)) {
2877                         ignore_crossmnt = 1;
2878                         goto out_encode;
2879                 }
2880                 /*
2881                  * Why the heck aren't we just using nfsd_lookup??
2882                  * Different "."/".." handling?  Something else?
2883                  * At least, add a comment here to explain....
2884                  */
2885                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2886                 if (err) {
2887                         nfserr = nfserrno(err);
2888                         goto out_put;
2889                 }
2890                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2891                 if (nfserr)
2892                         goto out_put;
2893
2894         }
2895 out_encode:
2896         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2897                                         cd->rd_rqstp, ignore_crossmnt);
2898 out_put:
2899         dput(dentry);
2900         exp_put(exp);
2901         return nfserr;
2902 }
2903
2904 static __be32 *
2905 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2906 {
2907         __be32 *p;
2908
2909         p = xdr_reserve_space(xdr, 20);
2910         if (!p)
2911                 return NULL;
2912         *p++ = htonl(2);
2913         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2914         *p++ = htonl(0);                         /* bmval1 */
2915
2916         *p++ = htonl(4);     /* attribute length */
2917         *p++ = nfserr;       /* no htonl */
2918         return p;
2919 }
2920
2921 static int
2922 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2923                     loff_t offset, u64 ino, unsigned int d_type)
2924 {
2925         struct readdir_cd *ccd = ccdv;
2926         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2927         struct xdr_stream *xdr = cd->xdr;
2928         int start_offset = xdr->buf->len;
2929         int cookie_offset;
2930         u32 name_and_cookie;
2931         int entry_bytes;
2932         __be32 nfserr = nfserr_toosmall;
2933         __be64 wire_offset;
2934         __be32 *p;
2935
2936         /* In nfsv4, "." and ".." never make it onto the wire.. */
2937         if (name && isdotent(name, namlen)) {
2938                 cd->common.err = nfs_ok;
2939                 return 0;
2940         }
2941
2942         if (cd->cookie_offset) {
2943                 wire_offset = cpu_to_be64(offset);
2944                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2945                                                         &wire_offset, 8);
2946         }
2947
2948         p = xdr_reserve_space(xdr, 4);
2949         if (!p)
2950                 goto fail;
2951         *p++ = xdr_one;                             /* mark entry present */
2952         cookie_offset = xdr->buf->len;
2953         p = xdr_reserve_space(xdr, 3*4 + namlen);
2954         if (!p)
2955                 goto fail;
2956         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2957         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2958
2959         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2960         switch (nfserr) {
2961         case nfs_ok:
2962                 break;
2963         case nfserr_resource:
2964                 nfserr = nfserr_toosmall;
2965                 goto fail;
2966         case nfserr_noent:
2967                 xdr_truncate_encode(xdr, start_offset);
2968                 goto skip_entry;
2969         default:
2970                 /*
2971                  * If the client requested the RDATTR_ERROR attribute,
2972                  * we stuff the error code into this attribute
2973                  * and continue.  If this attribute was not requested,
2974                  * then in accordance with the spec, we fail the
2975                  * entire READDIR operation(!)
2976                  */
2977                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2978                         goto fail;
2979                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2980                 if (p == NULL) {
2981                         nfserr = nfserr_toosmall;
2982                         goto fail;
2983                 }
2984         }
2985         nfserr = nfserr_toosmall;
2986         entry_bytes = xdr->buf->len - start_offset;
2987         if (entry_bytes > cd->rd_maxcount)
2988                 goto fail;
2989         cd->rd_maxcount -= entry_bytes;
2990         /*
2991          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
2992          * let's always let through the first entry, at least:
2993          */
2994         if (!cd->rd_dircount)
2995                 goto fail;
2996         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
2997         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
2998                 goto fail;
2999         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3000
3001         cd->cookie_offset = cookie_offset;
3002 skip_entry:
3003         cd->common.err = nfs_ok;
3004         return 0;
3005 fail:
3006         xdr_truncate_encode(xdr, start_offset);
3007         cd->common.err = nfserr;
3008         return -EINVAL;
3009 }
3010
3011 static __be32
3012 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3013 {
3014         __be32 *p;
3015
3016         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3017         if (!p)
3018                 return nfserr_resource;
3019         *p++ = cpu_to_be32(sid->si_generation);
3020         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3021                                         sizeof(stateid_opaque_t));
3022         return 0;
3023 }
3024
3025 static __be32
3026 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3027 {
3028         struct xdr_stream *xdr = &resp->xdr;
3029         __be32 *p;
3030
3031         if (!nfserr) {
3032                 p = xdr_reserve_space(xdr, 8);
3033                 if (!p)
3034                         return nfserr_resource;
3035                 *p++ = cpu_to_be32(access->ac_supported);
3036                 *p++ = cpu_to_be32(access->ac_resp_access);
3037         }
3038         return nfserr;
3039 }
3040
3041 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3042 {
3043         struct xdr_stream *xdr = &resp->xdr;
3044         __be32 *p;
3045
3046         if (!nfserr) {
3047                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3048                 if (!p)
3049                         return nfserr_resource;
3050                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3051                                                 NFS4_MAX_SESSIONID_LEN);
3052                 *p++ = cpu_to_be32(bcts->dir);
3053                 /* Sorry, we do not yet support RDMA over 4.1: */
3054                 *p++ = cpu_to_be32(0);
3055         }
3056         return nfserr;
3057 }
3058
3059 static __be32
3060 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3061 {
3062         struct xdr_stream *xdr = &resp->xdr;
3063
3064         if (!nfserr)
3065                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3066
3067         return nfserr;
3068 }
3069
3070
3071 static __be32
3072 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3073 {
3074         struct xdr_stream *xdr = &resp->xdr;
3075         __be32 *p;
3076
3077         if (!nfserr) {
3078                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3079                 if (!p)
3080                         return nfserr_resource;
3081                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3082                                                 NFS4_VERIFIER_SIZE);
3083         }
3084         return nfserr;
3085 }
3086
3087 static __be32
3088 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3089 {
3090         struct xdr_stream *xdr = &resp->xdr;
3091         __be32 *p;
3092
3093         if (!nfserr) {
3094                 p = xdr_reserve_space(xdr, 20);
3095                 if (!p)
3096                         return nfserr_resource;
3097                 encode_cinfo(p, &create->cr_cinfo);
3098                 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3099                                 create->cr_bmval[1], create->cr_bmval[2]);
3100         }
3101         return nfserr;
3102 }
3103
3104 static __be32
3105 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3106 {
3107         struct svc_fh *fhp = getattr->ga_fhp;
3108         struct xdr_stream *xdr = &resp->xdr;
3109
3110         if (nfserr)
3111                 return nfserr;
3112
3113         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3114                                     getattr->ga_bmval,
3115                                     resp->rqstp, 0);
3116         return nfserr;
3117 }
3118
3119 static __be32
3120 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3121 {
3122         struct xdr_stream *xdr = &resp->xdr;
3123         struct svc_fh *fhp = *fhpp;
3124         unsigned int len;
3125         __be32 *p;
3126
3127         if (!nfserr) {
3128                 len = fhp->fh_handle.fh_size;
3129                 p = xdr_reserve_space(xdr, len + 4);
3130                 if (!p)
3131                         return nfserr_resource;
3132                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3133         }
3134         return nfserr;
3135 }
3136
3137 /*
3138 * Including all fields other than the name, a LOCK4denied structure requires
3139 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3140 */
3141 static __be32
3142 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3143 {
3144         struct xdr_netobj *conf = &ld->ld_owner;
3145         __be32 *p;
3146
3147 again:
3148         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3149         if (!p) {
3150                 /*
3151                  * Don't fail to return the result just because we can't
3152                  * return the conflicting open:
3153                  */
3154                 if (conf->len) {
3155                         kfree(conf->data);
3156                         conf->len = 0;
3157                         conf->data = NULL;
3158                         goto again;
3159                 }
3160                 return nfserr_resource;
3161         }
3162         p = xdr_encode_hyper(p, ld->ld_start);
3163         p = xdr_encode_hyper(p, ld->ld_length);
3164         *p++ = cpu_to_be32(ld->ld_type);
3165         if (conf->len) {
3166                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3167                 p = xdr_encode_opaque(p, conf->data, conf->len);
3168                 kfree(conf->data);
3169         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3170                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3171                 *p++ = cpu_to_be32(0); /* length of owner name */
3172         }
3173         return nfserr_denied;
3174 }
3175
3176 static __be32
3177 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3178 {
3179         struct xdr_stream *xdr = &resp->xdr;
3180
3181         if (!nfserr)
3182                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3183         else if (nfserr == nfserr_denied)
3184                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3185
3186         return nfserr;
3187 }
3188
3189 static __be32
3190 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3191 {
3192         struct xdr_stream *xdr = &resp->xdr;
3193
3194         if (nfserr == nfserr_denied)
3195                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3196         return nfserr;
3197 }
3198
3199 static __be32
3200 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3201 {
3202         struct xdr_stream *xdr = &resp->xdr;
3203
3204         if (!nfserr)
3205                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3206
3207         return nfserr;
3208 }
3209
3210
3211 static __be32
3212 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3213 {
3214         struct xdr_stream *xdr = &resp->xdr;
3215         __be32 *p;
3216
3217         if (!nfserr) {
3218                 p = xdr_reserve_space(xdr, 20);
3219                 if (!p)
3220                         return nfserr_resource;
3221                 p = encode_cinfo(p, &link->li_cinfo);
3222         }
3223         return nfserr;
3224 }
3225
3226
3227 static __be32
3228 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3229 {
3230         struct xdr_stream *xdr = &resp->xdr;
3231         __be32 *p;
3232
3233         if (nfserr)
3234                 goto out;
3235
3236         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3237         if (nfserr)
3238                 goto out;
3239         p = xdr_reserve_space(xdr, 24);
3240         if (!p)
3241                 return nfserr_resource;
3242         p = encode_cinfo(p, &open->op_cinfo);
3243         *p++ = cpu_to_be32(open->op_rflags);
3244
3245         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3246                                         open->op_bmval[2]);
3247         if (nfserr)
3248                 goto out;
3249
3250         p = xdr_reserve_space(xdr, 4);
3251         if (!p)
3252                 return nfserr_resource;
3253
3254         *p++ = cpu_to_be32(open->op_delegate_type);
3255         switch (open->op_delegate_type) {
3256         case NFS4_OPEN_DELEGATE_NONE:
3257                 break;
3258         case NFS4_OPEN_DELEGATE_READ:
3259                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3260                 if (nfserr)
3261                         return nfserr;
3262                 p = xdr_reserve_space(xdr, 20);
3263                 if (!p)
3264                         return nfserr_resource;
3265                 *p++ = cpu_to_be32(open->op_recall);
3266
3267                 /*
3268                  * TODO: ACE's in delegations
3269                  */
3270                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3271                 *p++ = cpu_to_be32(0);
3272                 *p++ = cpu_to_be32(0);
3273                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3274                 break;
3275         case NFS4_OPEN_DELEGATE_WRITE:
3276                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3277                 if (nfserr)
3278                         return nfserr;
3279                 p = xdr_reserve_space(xdr, 32);
3280                 if (!p)
3281                         return nfserr_resource;
3282                 *p++ = cpu_to_be32(0);
3283
3284                 /*
3285                  * TODO: space_limit's in delegations
3286                  */
3287                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3288                 *p++ = cpu_to_be32(~(u32)0);
3289                 *p++ = cpu_to_be32(~(u32)0);
3290
3291                 /*
3292                  * TODO: ACE's in delegations
3293                  */
3294                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3295                 *p++ = cpu_to_be32(0);
3296                 *p++ = cpu_to_be32(0);
3297                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3298                 break;
3299         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3300                 switch (open->op_why_no_deleg) {
3301                 case WND4_CONTENTION:
3302                 case WND4_RESOURCE:
3303                         p = xdr_reserve_space(xdr, 8);
3304                         if (!p)
3305                                 return nfserr_resource;
3306                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3307                         /* deleg signaling not supported yet: */
3308                         *p++ = cpu_to_be32(0);
3309                         break;
3310                 default:
3311                         p = xdr_reserve_space(xdr, 4);
3312                         if (!p)
3313                                 return nfserr_resource;
3314                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3315                 }
3316                 break;
3317         default:
3318                 BUG();
3319         }
3320         /* XXX save filehandle here */
3321 out:
3322         return nfserr;
3323 }
3324
3325 static __be32
3326 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3327 {
3328         struct xdr_stream *xdr = &resp->xdr;
3329
3330         if (!nfserr)
3331                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3332
3333         return nfserr;
3334 }
3335
3336 static __be32
3337 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3338 {
3339         struct xdr_stream *xdr = &resp->xdr;
3340
3341         if (!nfserr)
3342                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3343
3344         return nfserr;
3345 }
3346
3347 static __be32 nfsd4_encode_splice_read(
3348                                 struct nfsd4_compoundres *resp,
3349                                 struct nfsd4_read *read,
3350                                 struct file *file, unsigned long maxcount)
3351 {
3352         struct xdr_stream *xdr = &resp->xdr;
3353         struct xdr_buf *buf = xdr->buf;
3354         u32 eof;
3355         int space_left;
3356         __be32 nfserr;
3357         __be32 *p = xdr->p - 2;
3358
3359         /* Make sure there will be room for padding if needed */
3360         if (xdr->end - xdr->p < 1)
3361                 return nfserr_resource;
3362
3363         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3364                                   read->rd_offset, &maxcount);
3365         if (nfserr) {
3366                 /*
3367                  * nfsd_splice_actor may have already messed with the
3368                  * page length; reset it so as not to confuse
3369                  * xdr_truncate_encode:
3370                  */
3371                 buf->page_len = 0;
3372                 return nfserr;
3373         }
3374
3375         eof = (read->rd_offset + maxcount >=
3376                d_inode(read->rd_fhp->fh_dentry)->i_size);
3377
3378         *(p++) = htonl(eof);
3379         *(p++) = htonl(maxcount);
3380
3381         buf->page_len = maxcount;
3382         buf->len += maxcount;
3383         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3384                                                         / PAGE_SIZE;
3385
3386         /* Use rest of head for padding and remaining ops: */
3387         buf->tail[0].iov_base = xdr->p;
3388         buf->tail[0].iov_len = 0;
3389         xdr->iov = buf->tail;
3390         if (maxcount&3) {
3391                 int pad = 4 - (maxcount&3);
3392
3393                 *(xdr->p++) = 0;
3394
3395                 buf->tail[0].iov_base += maxcount&3;
3396                 buf->tail[0].iov_len = pad;
3397                 buf->len += pad;
3398         }
3399
3400         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3401                                 buf->buflen - buf->len);
3402         buf->buflen = buf->len + space_left;
3403         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3404
3405         return 0;
3406 }
3407
3408 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3409                                  struct nfsd4_read *read,
3410                                  struct file *file, unsigned long maxcount)
3411 {
3412         struct xdr_stream *xdr = &resp->xdr;
3413         u32 eof;
3414         int v;
3415         int starting_len = xdr->buf->len - 8;
3416         long len;
3417         int thislen;
3418         __be32 nfserr;
3419         __be32 tmp;
3420         __be32 *p;
3421         u32 zzz = 0;
3422         int pad;
3423
3424         len = maxcount;
3425         v = 0;
3426
3427         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3428         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3429         WARN_ON_ONCE(!p);
3430         resp->rqstp->rq_vec[v].iov_base = p;
3431         resp->rqstp->rq_vec[v].iov_len = thislen;
3432         v++;
3433         len -= thislen;
3434
3435         while (len) {
3436                 thislen = min_t(long, len, PAGE_SIZE);
3437                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3438                 WARN_ON_ONCE(!p);
3439                 resp->rqstp->rq_vec[v].iov_base = p;
3440                 resp->rqstp->rq_vec[v].iov_len = thislen;
3441                 v++;
3442                 len -= thislen;
3443         }
3444         read->rd_vlen = v;
3445
3446         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3447                         read->rd_vlen, &maxcount);
3448         if (nfserr)
3449                 return nfserr;
3450         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3451
3452         eof = (read->rd_offset + maxcount >=
3453                d_inode(read->rd_fhp->fh_dentry)->i_size);
3454
3455         tmp = htonl(eof);
3456         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3457         tmp = htonl(maxcount);
3458         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3459
3460         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3461         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3462                                                                 &zzz, pad);
3463         return 0;
3464
3465 }
3466
3467 static __be32
3468 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3469                   struct nfsd4_read *read)
3470 {
3471         unsigned long maxcount;
3472         struct xdr_stream *xdr = &resp->xdr;
3473         struct file *file = read->rd_filp;
3474         int starting_len = xdr->buf->len;
3475         struct raparms *ra = NULL;
3476         __be32 *p;
3477
3478         if (nfserr)
3479                 goto out;
3480
3481         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3482         if (!p) {
3483                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3484                 nfserr = nfserr_resource;
3485                 goto out;
3486         }
3487         if (resp->xdr.buf->page_len &&
3488             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3489                 WARN_ON_ONCE(1);
3490                 nfserr = nfserr_resource;
3491                 goto out;
3492         }
3493         xdr_commit_encode(xdr);
3494
3495         maxcount = svc_max_payload(resp->rqstp);
3496         maxcount = min_t(unsigned long, maxcount,
3497                          (xdr->buf->buflen - xdr->buf->len));
3498         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3499
3500         if (read->rd_tmp_file)
3501                 ra = nfsd_init_raparms(file);
3502
3503         if (file->f_op->splice_read &&
3504             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3505                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3506         else
3507                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3508
3509         if (ra)
3510                 nfsd_put_raparams(file, ra);
3511
3512         if (nfserr)
3513                 xdr_truncate_encode(xdr, starting_len);
3514
3515 out:
3516         if (file)
3517                 fput(file);
3518         return nfserr;
3519 }
3520
3521 static __be32
3522 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3523 {
3524         int maxcount;
3525         __be32 wire_count;
3526         int zero = 0;
3527         struct xdr_stream *xdr = &resp->xdr;
3528         int length_offset = xdr->buf->len;
3529         __be32 *p;
3530
3531         if (nfserr)
3532                 return nfserr;
3533
3534         p = xdr_reserve_space(xdr, 4);
3535         if (!p)
3536                 return nfserr_resource;
3537         maxcount = PAGE_SIZE;
3538
3539         p = xdr_reserve_space(xdr, maxcount);
3540         if (!p)
3541                 return nfserr_resource;
3542         /*
3543          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3544          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3545          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3546          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3547          */
3548         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3549                                                 (char *)p, &maxcount);
3550         if (nfserr == nfserr_isdir)
3551                 nfserr = nfserr_inval;
3552         if (nfserr) {
3553                 xdr_truncate_encode(xdr, length_offset);
3554                 return nfserr;
3555         }
3556
3557         wire_count = htonl(maxcount);
3558         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3559         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3560         if (maxcount & 3)
3561                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3562                                                 &zero, 4 - (maxcount&3));
3563         return 0;
3564 }
3565
3566 static __be32
3567 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3568 {
3569         int maxcount;
3570         int bytes_left;
3571         loff_t offset;
3572         __be64 wire_offset;
3573         struct xdr_stream *xdr = &resp->xdr;
3574         int starting_len = xdr->buf->len;
3575         __be32 *p;
3576
3577         if (nfserr)
3578                 return nfserr;
3579
3580         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3581         if (!p)
3582                 return nfserr_resource;
3583
3584         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3585         *p++ = cpu_to_be32(0);
3586         *p++ = cpu_to_be32(0);
3587         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3588                                 - (char *)resp->xdr.buf->head[0].iov_base;
3589
3590         /*
3591          * Number of bytes left for directory entries allowing for the
3592          * final 8 bytes of the readdir and a following failed op:
3593          */
3594         bytes_left = xdr->buf->buflen - xdr->buf->len
3595                         - COMPOUND_ERR_SLACK_SPACE - 8;
3596         if (bytes_left < 0) {
3597                 nfserr = nfserr_resource;
3598                 goto err_no_verf;
3599         }
3600         maxcount = svc_max_payload(resp->rqstp);
3601         maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3602         /*
3603          * Note the rfc defines rd_maxcount as the size of the
3604          * READDIR4resok structure, which includes the verifier above
3605          * and the 8 bytes encoded at the end of this function:
3606          */
3607         if (maxcount < 16) {
3608                 nfserr = nfserr_toosmall;
3609                 goto err_no_verf;
3610         }
3611         maxcount = min_t(int, maxcount-16, bytes_left);
3612
3613         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3614         if (!readdir->rd_dircount)
3615                 readdir->rd_dircount = svc_max_payload(resp->rqstp);
3616
3617         readdir->xdr = xdr;
3618         readdir->rd_maxcount = maxcount;
3619         readdir->common.err = 0;
3620         readdir->cookie_offset = 0;
3621
3622         offset = readdir->rd_cookie;
3623         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3624                               &offset,
3625                               &readdir->common, nfsd4_encode_dirent);
3626         if (nfserr == nfs_ok &&
3627             readdir->common.err == nfserr_toosmall &&
3628             xdr->buf->len == starting_len + 8) {
3629                 /* nothing encoded; which limit did we hit?: */
3630                 if (maxcount - 16 < bytes_left)
3631                         /* It was the fault of rd_maxcount: */
3632                         nfserr = nfserr_toosmall;
3633                 else
3634                         /* We ran out of buffer space: */
3635                         nfserr = nfserr_resource;
3636         }
3637         if (nfserr)
3638                 goto err_no_verf;
3639
3640         if (readdir->cookie_offset) {
3641                 wire_offset = cpu_to_be64(offset);
3642                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3643                                                         &wire_offset, 8);
3644         }
3645
3646         p = xdr_reserve_space(xdr, 8);
3647         if (!p) {
3648                 WARN_ON_ONCE(1);
3649                 goto err_no_verf;
3650         }
3651         *p++ = 0;       /* no more entries */
3652         *p++ = htonl(readdir->common.err == nfserr_eof);
3653
3654         return 0;
3655 err_no_verf:
3656         xdr_truncate_encode(xdr, starting_len);
3657         return nfserr;
3658 }
3659
3660 static __be32
3661 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3662 {
3663         struct xdr_stream *xdr = &resp->xdr;
3664         __be32 *p;
3665
3666         if (!nfserr) {
3667                 p = xdr_reserve_space(xdr, 20);
3668                 if (!p)
3669                         return nfserr_resource;
3670                 p = encode_cinfo(p, &remove->rm_cinfo);
3671         }
3672         return nfserr;
3673 }
3674
3675 static __be32
3676 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3677 {
3678         struct xdr_stream *xdr = &resp->xdr;
3679         __be32 *p;
3680
3681         if (!nfserr) {
3682                 p = xdr_reserve_space(xdr, 40);
3683                 if (!p)
3684                         return nfserr_resource;
3685                 p = encode_cinfo(p, &rename->rn_sinfo);
3686                 p = encode_cinfo(p, &rename->rn_tinfo);
3687         }
3688         return nfserr;
3689 }
3690
3691 static __be32
3692 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3693                          __be32 nfserr, struct svc_export *exp)
3694 {
3695         u32 i, nflavs, supported;
3696         struct exp_flavor_info *flavs;
3697         struct exp_flavor_info def_flavs[2];
3698         __be32 *p, *flavorsp;
3699         static bool report = true;
3700
3701         if (nfserr)
3702                 goto out;
3703         nfserr = nfserr_resource;
3704         if (exp->ex_nflavors) {
3705                 flavs = exp->ex_flavors;
3706                 nflavs = exp->ex_nflavors;
3707         } else { /* Handling of some defaults in absence of real secinfo: */
3708                 flavs = def_flavs;
3709                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3710                         nflavs = 2;
3711                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3712                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3713                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3714                         nflavs = 1;
3715                         flavs[0].pseudoflavor
3716                                         = svcauth_gss_flavor(exp->ex_client);
3717                 } else {
3718                         nflavs = 1;
3719                         flavs[0].pseudoflavor
3720                                         = exp->ex_client->flavour->flavour;
3721                 }
3722         }
3723
3724         supported = 0;
3725         p = xdr_reserve_space(xdr, 4);
3726         if (!p)
3727                 goto out;
3728         flavorsp = p++;         /* to be backfilled later */
3729
3730         for (i = 0; i < nflavs; i++) {
3731                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3732                 struct rpcsec_gss_info info;
3733
3734                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3735                         supported++;
3736                         p = xdr_reserve_space(xdr, 4 + 4 +
3737                                               XDR_LEN(info.oid.len) + 4 + 4);
3738                         if (!p)
3739                                 goto out;
3740                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3741                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3742                         *p++ = cpu_to_be32(info.qop);
3743                         *p++ = cpu_to_be32(info.service);
3744                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3745                         supported++;
3746                         p = xdr_reserve_space(xdr, 4);
3747                         if (!p)
3748                                 goto out;
3749                         *p++ = cpu_to_be32(pf);
3750                 } else {
3751                         if (report)
3752                                 pr_warn("NFS: SECINFO: security flavor %u "
3753                                         "is not supported\n", pf);
3754                 }
3755         }
3756
3757         if (nflavs != supported)
3758                 report = false;
3759         *flavorsp = htonl(supported);
3760         nfserr = 0;
3761 out:
3762         if (exp)
3763                 exp_put(exp);
3764         return nfserr;
3765 }
3766
3767 static __be32
3768 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3769                      struct nfsd4_secinfo *secinfo)
3770 {
3771         struct xdr_stream *xdr = &resp->xdr;
3772
3773         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3774 }
3775
3776 static __be32
3777 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3778                      struct nfsd4_secinfo_no_name *secinfo)
3779 {
3780         struct xdr_stream *xdr = &resp->xdr;
3781
3782         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3783 }
3784
3785 /*
3786  * The SETATTR encode routine is special -- it always encodes a bitmap,
3787  * regardless of the error status.
3788  */
3789 static __be32
3790 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3791 {
3792         struct xdr_stream *xdr = &resp->xdr;
3793         __be32 *p;
3794
3795         p = xdr_reserve_space(xdr, 16);
3796         if (!p)
3797                 return nfserr_resource;
3798         if (nfserr) {
3799                 *p++ = cpu_to_be32(3);
3800                 *p++ = cpu_to_be32(0);
3801                 *p++ = cpu_to_be32(0);
3802                 *p++ = cpu_to_be32(0);
3803         }
3804         else {
3805                 *p++ = cpu_to_be32(3);
3806                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3807                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3808                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3809         }
3810         return nfserr;
3811 }
3812
3813 static __be32
3814 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3815 {
3816         struct xdr_stream *xdr = &resp->xdr;
3817         __be32 *p;
3818
3819         if (!nfserr) {
3820                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3821                 if (!p)
3822                         return nfserr_resource;
3823                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3824                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3825                                                 NFS4_VERIFIER_SIZE);
3826         }
3827         else if (nfserr == nfserr_clid_inuse) {
3828                 p = xdr_reserve_space(xdr, 8);
3829                 if (!p)
3830                         return nfserr_resource;
3831                 *p++ = cpu_to_be32(0);
3832                 *p++ = cpu_to_be32(0);
3833         }
3834         return nfserr;
3835 }
3836
3837 static __be32
3838 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3839 {
3840         struct xdr_stream *xdr = &resp->xdr;
3841         __be32 *p;
3842
3843         if (!nfserr) {
3844                 p = xdr_reserve_space(xdr, 16);
3845                 if (!p)
3846                         return nfserr_resource;
3847                 *p++ = cpu_to_be32(write->wr_bytes_written);
3848                 *p++ = cpu_to_be32(write->wr_how_written);
3849                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3850                                                         NFS4_VERIFIER_SIZE);
3851         }
3852         return nfserr;
3853 }
3854
3855 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3856         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3857               1 << (OP_EXCHANGE_ID - 32) |
3858               1 << (OP_CREATE_SESSION - 32) |
3859               1 << (OP_DESTROY_SESSION - 32) |
3860               1 << (OP_DESTROY_CLIENTID - 32)
3861 };
3862
3863 static __be32
3864 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3865                          struct nfsd4_exchange_id *exid)
3866 {
3867         struct xdr_stream *xdr = &resp->xdr;
3868         __be32 *p;
3869         char *major_id;
3870         char *server_scope;
3871         int major_id_sz;
3872         int server_scope_sz;
3873         uint64_t minor_id = 0;
3874
3875         if (nfserr)
3876                 return nfserr;
3877
3878         major_id = utsname()->nodename;
3879         major_id_sz = strlen(major_id);
3880         server_scope = utsname()->nodename;
3881         server_scope_sz = strlen(server_scope);
3882
3883         p = xdr_reserve_space(xdr,
3884                 8 /* eir_clientid */ +
3885                 4 /* eir_sequenceid */ +
3886                 4 /* eir_flags */ +
3887                 4 /* spr_how */);
3888         if (!p)
3889                 return nfserr_resource;
3890
3891         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3892         *p++ = cpu_to_be32(exid->seqid);
3893         *p++ = cpu_to_be32(exid->flags);
3894
3895         *p++ = cpu_to_be32(exid->spa_how);
3896
3897         switch (exid->spa_how) {
3898         case SP4_NONE:
3899                 break;
3900         case SP4_MACH_CRED:
3901                 /* spo_must_enforce, spo_must_allow */
3902                 p = xdr_reserve_space(xdr, 16);
3903                 if (!p)
3904                         return nfserr_resource;
3905
3906                 /* spo_must_enforce bitmap: */
3907                 *p++ = cpu_to_be32(2);
3908                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3909                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3910                 /* empty spo_must_allow bitmap: */
3911                 *p++ = cpu_to_be32(0);
3912
3913                 break;
3914         default:
3915                 WARN_ON_ONCE(1);
3916         }
3917
3918         p = xdr_reserve_space(xdr,
3919                 8 /* so_minor_id */ +
3920                 4 /* so_major_id.len */ +
3921                 (XDR_QUADLEN(major_id_sz) * 4) +
3922                 4 /* eir_server_scope.len */ +
3923                 (XDR_QUADLEN(server_scope_sz) * 4) +
3924                 4 /* eir_server_impl_id.count (0) */);
3925         if (!p)
3926                 return nfserr_resource;
3927
3928         /* The server_owner struct */
3929         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3930         /* major id */
3931         p = xdr_encode_opaque(p, major_id, major_id_sz);
3932
3933         /* Server scope */
3934         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3935
3936         /* Implementation id */
3937         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3938         return 0;
3939 }
3940
3941 static __be32
3942 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3943                             struct nfsd4_create_session *sess)
3944 {
3945         struct xdr_stream *xdr = &resp->xdr;
3946         __be32 *p;
3947
3948         if (nfserr)
3949                 return nfserr;
3950
3951         p = xdr_reserve_space(xdr, 24);
3952         if (!p)
3953                 return nfserr_resource;
3954         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3955                                         NFS4_MAX_SESSIONID_LEN);
3956         *p++ = cpu_to_be32(sess->seqid);
3957         *p++ = cpu_to_be32(sess->flags);
3958
3959         p = xdr_reserve_space(xdr, 28);
3960         if (!p)
3961                 return nfserr_resource;
3962         *p++ = cpu_to_be32(0); /* headerpadsz */
3963         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3964         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3965         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3966         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3967         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3968         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3969
3970         if (sess->fore_channel.nr_rdma_attrs) {
3971                 p = xdr_reserve_space(xdr, 4);
3972                 if (!p)
3973                         return nfserr_resource;
3974                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3975         }
3976
3977         p = xdr_reserve_space(xdr, 28);
3978         if (!p)
3979                 return nfserr_resource;
3980         *p++ = cpu_to_be32(0); /* headerpadsz */
3981         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3982         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3983         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3984         *p++ = cpu_to_be32(sess->back_channel.maxops);
3985         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3986         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3987
3988         if (sess->back_channel.nr_rdma_attrs) {
3989                 p = xdr_reserve_space(xdr, 4);
3990                 if (!p)
3991                         return nfserr_resource;
3992                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3993         }
3994         return 0;
3995 }
3996
3997 static __be32
3998 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3999                       struct nfsd4_sequence *seq)
4000 {
4001         struct xdr_stream *xdr = &resp->xdr;
4002         __be32 *p;
4003
4004         if (nfserr)
4005                 return nfserr;
4006
4007         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4008         if (!p)
4009                 return nfserr_resource;
4010         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4011                                         NFS4_MAX_SESSIONID_LEN);
4012         *p++ = cpu_to_be32(seq->seqid);
4013         *p++ = cpu_to_be32(seq->slotid);
4014         /* Note slotid's are numbered from zero: */
4015         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4016         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4017         *p++ = cpu_to_be32(seq->status_flags);
4018
4019         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4020         return 0;
4021 }
4022
4023 static __be32
4024 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4025                           struct nfsd4_test_stateid *test_stateid)
4026 {
4027         struct xdr_stream *xdr = &resp->xdr;
4028         struct nfsd4_test_stateid_id *stateid, *next;
4029         __be32 *p;
4030
4031         if (nfserr)
4032                 return nfserr;
4033
4034         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4035         if (!p)
4036                 return nfserr_resource;
4037         *p++ = htonl(test_stateid->ts_num_ids);
4038
4039         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4040                 *p++ = stateid->ts_id_status;
4041         }
4042
4043         return nfserr;
4044 }
4045
4046 #ifdef CONFIG_NFSD_PNFS
4047 static __be32
4048 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4049                 struct nfsd4_getdeviceinfo *gdev)
4050 {
4051         struct xdr_stream *xdr = &resp->xdr;
4052         const struct nfsd4_layout_ops *ops;
4053         u32 starting_len = xdr->buf->len, needed_len;
4054         __be32 *p;
4055
4056         dprintk("%s: err %d\n", __func__, nfserr);
4057         if (nfserr)
4058                 goto out;
4059
4060         nfserr = nfserr_resource;
4061         p = xdr_reserve_space(xdr, 4);
4062         if (!p)
4063                 goto out;
4064
4065         *p++ = cpu_to_be32(gdev->gd_layout_type);
4066
4067         /* If maxcount is 0 then just update notifications */
4068         if (gdev->gd_maxcount != 0) {
4069                 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4070                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4071                 if (nfserr) {
4072                         /*
4073                          * We don't bother to burden the layout drivers with
4074                          * enforcing gd_maxcount, just tell the client to
4075                          * come back with a bigger buffer if it's not enough.
4076                          */
4077                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4078                                 goto toosmall;
4079                         goto out;
4080                 }
4081         }
4082
4083         nfserr = nfserr_resource;
4084         if (gdev->gd_notify_types) {
4085                 p = xdr_reserve_space(xdr, 4 + 4);
4086                 if (!p)
4087                         goto out;
4088                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4089                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4090         } else {
4091                 p = xdr_reserve_space(xdr, 4);
4092                 if (!p)
4093                         goto out;
4094                 *p++ = 0;
4095         }
4096
4097         nfserr = 0;
4098 out:
4099         kfree(gdev->gd_device);
4100         dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4101         return nfserr;
4102
4103 toosmall:
4104         dprintk("%s: maxcount too small\n", __func__);
4105         needed_len = xdr->buf->len + 4 /* notifications */;
4106         xdr_truncate_encode(xdr, starting_len);
4107         p = xdr_reserve_space(xdr, 4);
4108         if (!p) {
4109                 nfserr = nfserr_resource;
4110         } else {
4111                 *p++ = cpu_to_be32(needed_len);
4112                 nfserr = nfserr_toosmall;
4113         }
4114         goto out;
4115 }
4116
4117 static __be32
4118 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4119                 struct nfsd4_layoutget *lgp)
4120 {
4121         struct xdr_stream *xdr = &resp->xdr;
4122         const struct nfsd4_layout_ops *ops;
4123         __be32 *p;
4124
4125         dprintk("%s: err %d\n", __func__, nfserr);
4126         if (nfserr)
4127                 goto out;
4128
4129         nfserr = nfserr_resource;
4130         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4131         if (!p)
4132                 goto out;
4133
4134         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4135         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4136         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4137                                     sizeof(stateid_opaque_t));
4138
4139         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4140         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4141         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4142         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4143         *p++ = cpu_to_be32(lgp->lg_layout_type);
4144
4145         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4146         nfserr = ops->encode_layoutget(xdr, lgp);
4147 out:
4148         kfree(lgp->lg_content);
4149         return nfserr;
4150 }
4151
4152 static __be32
4153 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4154                           struct nfsd4_layoutcommit *lcp)
4155 {
4156         struct xdr_stream *xdr = &resp->xdr;
4157         __be32 *p;
4158
4159         if (nfserr)
4160                 return nfserr;
4161
4162         p = xdr_reserve_space(xdr, 4);
4163         if (!p)
4164                 return nfserr_resource;
4165         *p++ = cpu_to_be32(lcp->lc_size_chg);
4166         if (lcp->lc_size_chg) {
4167                 p = xdr_reserve_space(xdr, 8);
4168                 if (!p)
4169                         return nfserr_resource;
4170                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4171         }
4172
4173         return nfs_ok;
4174 }
4175
4176 static __be32
4177 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4178                 struct nfsd4_layoutreturn *lrp)
4179 {
4180         struct xdr_stream *xdr = &resp->xdr;
4181         __be32 *p;
4182
4183         if (nfserr)
4184                 return nfserr;
4185
4186         p = xdr_reserve_space(xdr, 4);
4187         if (!p)
4188                 return nfserr_resource;
4189         *p++ = cpu_to_be32(lrp->lrs_present);
4190         if (lrp->lrs_present)
4191                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4192         return nfs_ok;
4193 }
4194 #endif /* CONFIG_NFSD_PNFS */
4195
4196 static __be32
4197 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4198                   struct nfsd4_seek *seek)
4199 {
4200         __be32 *p;
4201
4202         if (nfserr)
4203                 return nfserr;
4204
4205         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4206         *p++ = cpu_to_be32(seek->seek_eof);
4207         p = xdr_encode_hyper(p, seek->seek_pos);
4208
4209         return nfserr;
4210 }
4211
4212 static __be32
4213 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4214 {
4215         return nfserr;
4216 }
4217
4218 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4219
4220 /*
4221  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4222  * since we don't need to filter out obsolete ops as this is
4223  * done in the decoding phase.
4224  */
4225 static nfsd4_enc nfsd4_enc_ops[] = {
4226         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4227         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4228         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4229         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4230         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4231         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4232         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4233         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4234         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4235         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4236         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4237         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4238         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4239         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4240         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4241         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4242         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4243         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4244         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4245         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4246         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4247         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4248         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4249         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4250         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4251         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4252         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4253         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4254         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4255         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4256         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4257         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4258         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4259         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4260         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4261         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4262         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4263
4264         /* NFSv4.1 operations */
4265         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4266         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4267         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4268         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4269         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4270         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4271         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4272 #ifdef CONFIG_NFSD_PNFS
4273         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4274         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4275         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4276         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4277         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4278 #else
4279         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4280         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4281         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4282         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4283         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4284 #endif
4285         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4286         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4287         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4288         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4289         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4290         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4291         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4292
4293         /* NFSv4.2 operations */
4294         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4295         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_noop,
4296         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4297         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4298         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4299         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4300         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4301         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4302         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4303         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4304         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4305         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4306 };
4307
4308 /*
4309  * Calculate whether we still have space to encode repsize bytes.
4310  * There are two considerations:
4311  *     - For NFS versions >=4.1, the size of the reply must stay within
4312  *       session limits
4313  *     - For all NFS versions, we must stay within limited preallocated
4314  *       buffer space.
4315  *
4316  * This is called before the operation is processed, so can only provide
4317  * an upper estimate.  For some nonidempotent operations (such as
4318  * getattr), it's not necessarily a problem if that estimate is wrong,
4319  * as we can fail it after processing without significant side effects.
4320  */
4321 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4322 {
4323         struct xdr_buf *buf = &resp->rqstp->rq_res;
4324         struct nfsd4_slot *slot = resp->cstate.slot;
4325
4326         if (buf->len + respsize <= buf->buflen)
4327                 return nfs_ok;
4328         if (!nfsd4_has_session(&resp->cstate))
4329                 return nfserr_resource;
4330         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4331                 WARN_ON_ONCE(1);
4332                 return nfserr_rep_too_big_to_cache;
4333         }
4334         return nfserr_rep_too_big;
4335 }
4336
4337 void
4338 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4339 {
4340         struct xdr_stream *xdr = &resp->xdr;
4341         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4342         struct svc_rqst *rqstp = resp->rqstp;
4343         int post_err_offset;
4344         nfsd4_enc encoder;
4345         __be32 *p;
4346
4347         p = xdr_reserve_space(xdr, 8);
4348         if (!p) {
4349                 WARN_ON_ONCE(1);
4350                 return;
4351         }
4352         *p++ = cpu_to_be32(op->opnum);
4353         post_err_offset = xdr->buf->len;
4354
4355         if (op->opnum == OP_ILLEGAL)
4356                 goto status;
4357         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4358                !nfsd4_enc_ops[op->opnum]);
4359         encoder = nfsd4_enc_ops[op->opnum];
4360         op->status = encoder(resp, op->status, &op->u);
4361         xdr_commit_encode(xdr);
4362
4363         /* nfsd4_check_resp_size guarantees enough room for error status */
4364         if (!op->status) {
4365                 int space_needed = 0;
4366                 if (!nfsd4_last_compound_op(rqstp))
4367                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4368                 op->status = nfsd4_check_resp_size(resp, space_needed);
4369         }
4370         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4371                 struct nfsd4_slot *slot = resp->cstate.slot;
4372
4373                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4374                         op->status = nfserr_rep_too_big_to_cache;
4375                 else
4376                         op->status = nfserr_rep_too_big;
4377         }
4378         if (op->status == nfserr_resource ||
4379             op->status == nfserr_rep_too_big ||
4380             op->status == nfserr_rep_too_big_to_cache) {
4381                 /*
4382                  * The operation may have already been encoded or
4383                  * partially encoded.  No op returns anything additional
4384                  * in the case of one of these three errors, so we can
4385                  * just truncate back to after the status.  But it's a
4386                  * bug if we had to do this on a non-idempotent op:
4387                  */
4388                 warn_on_nonidempotent_op(op);
4389                 xdr_truncate_encode(xdr, post_err_offset);
4390         }
4391         if (so) {
4392                 int len = xdr->buf->len - post_err_offset;
4393
4394                 so->so_replay.rp_status = op->status;
4395                 so->so_replay.rp_buflen = len;
4396                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4397                                                 so->so_replay.rp_buf, len);
4398         }
4399 status:
4400         /* Note that op->status is already in network byte order: */
4401         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4402 }
4403
4404 /*
4405  * Encode the reply stored in the stateowner reply cache
4406  *
4407  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4408  * previously sent already encoded operation.
4409  */
4410 void
4411 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4412 {
4413         __be32 *p;
4414         struct nfs4_replay *rp = op->replay;
4415
4416         BUG_ON(!rp);
4417
4418         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4419         if (!p) {
4420                 WARN_ON_ONCE(1);
4421                 return;
4422         }
4423         *p++ = cpu_to_be32(op->opnum);
4424         *p++ = rp->rp_status;  /* already xdr'ed */
4425
4426         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4427 }
4428
4429 int
4430 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4431 {
4432         return xdr_ressize_check(rqstp, p);
4433 }
4434
4435 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4436 {
4437         struct svc_rqst *rqstp = rq;
4438         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4439
4440         if (args->ops != args->iops) {
4441                 kfree(args->ops);
4442                 args->ops = args->iops;
4443         }
4444         kfree(args->tmpp);
4445         args->tmpp = NULL;
4446         while (args->to_free) {
4447                 struct svcxdr_tmpbuf *tb = args->to_free;
4448                 args->to_free = tb->next;
4449                 kfree(tb);
4450         }
4451         return 1;
4452 }
4453
4454 int
4455 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4456 {
4457         if (rqstp->rq_arg.head[0].iov_len % 4) {
4458                 /* client is nuts */
4459                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4460                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4461                 return 0;
4462         }
4463         args->p = p;
4464         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4465         args->pagelist = rqstp->rq_arg.pages;
4466         args->pagelen = rqstp->rq_arg.page_len;
4467         args->tmpp = NULL;
4468         args->to_free = NULL;
4469         args->ops = args->iops;
4470         args->rqstp = rqstp;
4471
4472         return !nfsd4_decode_compound(args);
4473 }
4474
4475 int
4476 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4477 {
4478         /*
4479          * All that remains is to write the tag and operation count...
4480          */
4481         struct xdr_buf *buf = resp->xdr.buf;
4482
4483         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4484                                  buf->tail[0].iov_len);
4485
4486         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4487
4488         p = resp->tagp;
4489         *p++ = htonl(resp->taglen);
4490         memcpy(p, resp->tag, resp->taglen);
4491         p += XDR_QUADLEN(resp->taglen);
4492         *p++ = htonl(resp->opcnt);
4493
4494         nfsd4_sequence_done(resp);
4495         return 1;
4496 }
4497
4498 /*
4499  * Local variables:
4500  *  c-basic-offset: 8
4501  * End:
4502  */