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                 status = nfsd4_decode_bitmap(argp,
1301                                         exid->spo_must_enforce);
1302                 if (status)
1303                         goto out;
1304                 /* spo_must_allow */
1305                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1306                 if (status)
1307                         goto out;
1308                 break;
1309         case SP4_SSV:
1310                 /* ssp_ops */
1311                 READ_BUF(4);
1312                 dummy = be32_to_cpup(p++);
1313                 READ_BUF(dummy * 4);
1314                 p += dummy;
1315
1316                 READ_BUF(4);
1317                 dummy = be32_to_cpup(p++);
1318                 READ_BUF(dummy * 4);
1319                 p += dummy;
1320
1321                 /* ssp_hash_algs<> */
1322                 READ_BUF(4);
1323                 tmp = be32_to_cpup(p++);
1324                 while (tmp--) {
1325                         READ_BUF(4);
1326                         dummy = be32_to_cpup(p++);
1327                         READ_BUF(dummy);
1328                         p += XDR_QUADLEN(dummy);
1329                 }
1330
1331                 /* ssp_encr_algs<> */
1332                 READ_BUF(4);
1333                 tmp = be32_to_cpup(p++);
1334                 while (tmp--) {
1335                         READ_BUF(4);
1336                         dummy = be32_to_cpup(p++);
1337                         READ_BUF(dummy);
1338                         p += XDR_QUADLEN(dummy);
1339                 }
1340
1341                 /* ssp_window and ssp_num_gss_handles */
1342                 READ_BUF(8);
1343                 dummy = be32_to_cpup(p++);
1344                 dummy = be32_to_cpup(p++);
1345                 break;
1346         default:
1347                 goto xdr_error;
1348         }
1349
1350         /* Ignore Implementation ID */
1351         READ_BUF(4);    /* nfs_impl_id4 array length */
1352         dummy = be32_to_cpup(p++);
1353
1354         if (dummy > 1)
1355                 goto xdr_error;
1356
1357         if (dummy == 1) {
1358                 /* nii_domain */
1359                 READ_BUF(4);
1360                 dummy = be32_to_cpup(p++);
1361                 READ_BUF(dummy);
1362                 p += XDR_QUADLEN(dummy);
1363
1364                 /* nii_name */
1365                 READ_BUF(4);
1366                 dummy = be32_to_cpup(p++);
1367                 READ_BUF(dummy);
1368                 p += XDR_QUADLEN(dummy);
1369
1370                 /* nii_date */
1371                 READ_BUF(12);
1372                 p += 3;
1373         }
1374         DECODE_TAIL;
1375 }
1376
1377 static __be32
1378 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1379                             struct nfsd4_create_session *sess)
1380 {
1381         DECODE_HEAD;
1382         u32 dummy;
1383
1384         READ_BUF(16);
1385         COPYMEM(&sess->clientid, 8);
1386         sess->seqid = be32_to_cpup(p++);
1387         sess->flags = be32_to_cpup(p++);
1388
1389         /* Fore channel attrs */
1390         READ_BUF(28);
1391         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1392         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1393         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1394         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1395         sess->fore_channel.maxops = be32_to_cpup(p++);
1396         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1397         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1398         if (sess->fore_channel.nr_rdma_attrs == 1) {
1399                 READ_BUF(4);
1400                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1401         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1402                 dprintk("Too many fore channel attr bitmaps!\n");
1403                 goto xdr_error;
1404         }
1405
1406         /* Back channel attrs */
1407         READ_BUF(28);
1408         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1409         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1410         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1411         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1412         sess->back_channel.maxops = be32_to_cpup(p++);
1413         sess->back_channel.maxreqs = be32_to_cpup(p++);
1414         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1415         if (sess->back_channel.nr_rdma_attrs == 1) {
1416                 READ_BUF(4);
1417                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1418         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1419                 dprintk("Too many back channel attr bitmaps!\n");
1420                 goto xdr_error;
1421         }
1422
1423         READ_BUF(4);
1424         sess->callback_prog = be32_to_cpup(p++);
1425         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1426         DECODE_TAIL;
1427 }
1428
1429 static __be32
1430 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1431                              struct nfsd4_destroy_session *destroy_session)
1432 {
1433         DECODE_HEAD;
1434         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1435         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1436
1437         DECODE_TAIL;
1438 }
1439
1440 static __be32
1441 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1442                           struct nfsd4_free_stateid *free_stateid)
1443 {
1444         DECODE_HEAD;
1445
1446         READ_BUF(sizeof(stateid_t));
1447         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1448         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1449
1450         DECODE_TAIL;
1451 }
1452
1453 static __be32
1454 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1455                       struct nfsd4_sequence *seq)
1456 {
1457         DECODE_HEAD;
1458
1459         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1460         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1461         seq->seqid = be32_to_cpup(p++);
1462         seq->slotid = be32_to_cpup(p++);
1463         seq->maxslots = be32_to_cpup(p++);
1464         seq->cachethis = be32_to_cpup(p++);
1465
1466         DECODE_TAIL;
1467 }
1468
1469 static __be32
1470 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1471 {
1472         int i;
1473         __be32 *p, status;
1474         struct nfsd4_test_stateid_id *stateid;
1475
1476         READ_BUF(4);
1477         test_stateid->ts_num_ids = ntohl(*p++);
1478
1479         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1480
1481         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1482                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1483                 if (!stateid) {
1484                         status = nfserrno(-ENOMEM);
1485                         goto out;
1486                 }
1487
1488                 INIT_LIST_HEAD(&stateid->ts_id_list);
1489                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1490
1491                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1492                 if (status)
1493                         goto out;
1494         }
1495
1496         status = 0;
1497 out:
1498         return status;
1499 xdr_error:
1500         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1501         status = nfserr_bad_xdr;
1502         goto out;
1503 }
1504
1505 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1506 {
1507         DECODE_HEAD;
1508
1509         READ_BUF(8);
1510         COPYMEM(&dc->clientid, 8);
1511
1512         DECODE_TAIL;
1513 }
1514
1515 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1516 {
1517         DECODE_HEAD;
1518
1519         READ_BUF(4);
1520         rc->rca_one_fs = be32_to_cpup(p++);
1521
1522         DECODE_TAIL;
1523 }
1524
1525 #ifdef CONFIG_NFSD_PNFS
1526 static __be32
1527 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1528                 struct nfsd4_getdeviceinfo *gdev)
1529 {
1530         DECODE_HEAD;
1531         u32 num, i;
1532
1533         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1534         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1535         gdev->gd_layout_type = be32_to_cpup(p++);
1536         gdev->gd_maxcount = be32_to_cpup(p++);
1537         num = be32_to_cpup(p++);
1538         if (num) {
1539                 if (num > 1000)
1540                         goto xdr_error;
1541                 READ_BUF(4 * num);
1542                 gdev->gd_notify_types = be32_to_cpup(p++);
1543                 for (i = 1; i < num; i++) {
1544                         if (be32_to_cpup(p++)) {
1545                                 status = nfserr_inval;
1546                                 goto out;
1547                         }
1548                 }
1549         }
1550         DECODE_TAIL;
1551 }
1552
1553 static __be32
1554 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1555                 struct nfsd4_layoutget *lgp)
1556 {
1557         DECODE_HEAD;
1558
1559         READ_BUF(36);
1560         lgp->lg_signal = be32_to_cpup(p++);
1561         lgp->lg_layout_type = be32_to_cpup(p++);
1562         lgp->lg_seg.iomode = be32_to_cpup(p++);
1563         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1564         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1565         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1566
1567         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1568         if (status)
1569                 return status;
1570
1571         READ_BUF(4);
1572         lgp->lg_maxcount = be32_to_cpup(p++);
1573
1574         DECODE_TAIL;
1575 }
1576
1577 static __be32
1578 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1579                 struct nfsd4_layoutcommit *lcp)
1580 {
1581         DECODE_HEAD;
1582         u32 timechange;
1583
1584         READ_BUF(20);
1585         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1586         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1587         lcp->lc_reclaim = be32_to_cpup(p++);
1588
1589         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1590         if (status)
1591                 return status;
1592
1593         READ_BUF(4);
1594         lcp->lc_newoffset = be32_to_cpup(p++);
1595         if (lcp->lc_newoffset) {
1596                 READ_BUF(8);
1597                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1598         } else
1599                 lcp->lc_last_wr = 0;
1600         READ_BUF(4);
1601         timechange = be32_to_cpup(p++);
1602         if (timechange) {
1603                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1604                 if (status)
1605                         return status;
1606         } else {
1607                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1608         }
1609         READ_BUF(8);
1610         lcp->lc_layout_type = be32_to_cpup(p++);
1611
1612         /*
1613          * Save the layout update in XDR format and let the layout driver deal
1614          * with it later.
1615          */
1616         lcp->lc_up_len = be32_to_cpup(p++);
1617         if (lcp->lc_up_len > 0) {
1618                 READ_BUF(lcp->lc_up_len);
1619                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1620         }
1621
1622         DECODE_TAIL;
1623 }
1624
1625 static __be32
1626 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1627                 struct nfsd4_layoutreturn *lrp)
1628 {
1629         DECODE_HEAD;
1630
1631         READ_BUF(16);
1632         lrp->lr_reclaim = be32_to_cpup(p++);
1633         lrp->lr_layout_type = be32_to_cpup(p++);
1634         lrp->lr_seg.iomode = be32_to_cpup(p++);
1635         lrp->lr_return_type = be32_to_cpup(p++);
1636         if (lrp->lr_return_type == RETURN_FILE) {
1637                 READ_BUF(16);
1638                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1639                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1640
1641                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1642                 if (status)
1643                         return status;
1644
1645                 READ_BUF(4);
1646                 lrp->lrf_body_len = be32_to_cpup(p++);
1647                 if (lrp->lrf_body_len > 0) {
1648                         READ_BUF(lrp->lrf_body_len);
1649                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1650                 }
1651         } else {
1652                 lrp->lr_seg.offset = 0;
1653                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1654         }
1655
1656         DECODE_TAIL;
1657 }
1658 #endif /* CONFIG_NFSD_PNFS */
1659
1660 static __be32
1661 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1662                        struct nfsd4_fallocate *fallocate)
1663 {
1664         DECODE_HEAD;
1665
1666         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1667         if (status)
1668                 return status;
1669
1670         READ_BUF(16);
1671         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1672         xdr_decode_hyper(p, &fallocate->falloc_length);
1673
1674         DECODE_TAIL;
1675 }
1676
1677 static __be32
1678 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1679 {
1680         DECODE_HEAD;
1681
1682         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1683         if (status)
1684                 return status;
1685         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1686         if (status)
1687                 return status;
1688
1689         READ_BUF(8 + 8 + 8);
1690         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1691         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1692         p = xdr_decode_hyper(p, &clone->cl_count);
1693         DECODE_TAIL;
1694 }
1695
1696 static __be32
1697 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1698 {
1699         DECODE_HEAD;
1700         unsigned int tmp;
1701
1702         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1703         if (status)
1704                 return status;
1705         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1706         if (status)
1707                 return status;
1708
1709         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1710         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1711         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1712         p = xdr_decode_hyper(p, &copy->cp_count);
1713         copy->cp_consecutive = be32_to_cpup(p++);
1714         copy->cp_synchronous = be32_to_cpup(p++);
1715         tmp = be32_to_cpup(p); /* Source server list not supported */
1716
1717         DECODE_TAIL;
1718 }
1719
1720 static __be32
1721 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1722 {
1723         DECODE_HEAD;
1724
1725         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1726         if (status)
1727                 return status;
1728
1729         READ_BUF(8 + 4);
1730         p = xdr_decode_hyper(p, &seek->seek_offset);
1731         seek->seek_whence = be32_to_cpup(p);
1732
1733         DECODE_TAIL;
1734 }
1735
1736 static __be32
1737 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1738 {
1739         return nfs_ok;
1740 }
1741
1742 static __be32
1743 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1744 {
1745         return nfserr_notsupp;
1746 }
1747
1748 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1749
1750 static nfsd4_dec nfsd4_dec_ops[] = {
1751         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1752         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1753         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1754         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1755         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1756         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1757         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1758         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1759         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1760         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1761         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1762         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1763         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1764         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1765         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1766         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1767         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1768         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1769         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1770         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1771         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1772         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1773         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1774         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1775         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1776         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1777         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1778         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1779         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1780         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1781         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1782         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1783         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1784         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1785         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1786         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1787         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1788
1789         /* new operations for NFSv4.1 */
1790         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1791         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1792         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1793         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1794         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1795         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1796         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1797 #ifdef CONFIG_NFSD_PNFS
1798         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1799         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1800         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1801         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1802         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1803 #else
1804         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1805         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1806         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1807         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1808         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1809 #endif
1810         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1811         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1812         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1813         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1814         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1815         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1816         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1817
1818         /* new operations for NFSv4.2 */
1819         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1820         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1821         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1822         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1823         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1824         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1825         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1826         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1827         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1828         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1829         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1830         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1831         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1832 };
1833
1834 static inline bool
1835 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1836 {
1837         if (op->opnum < FIRST_NFS4_OP)
1838                 return false;
1839         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1840                 return false;
1841         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1842                 return false;
1843         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1844                 return false;
1845         return true;
1846 }
1847
1848 static __be32
1849 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1850 {
1851         DECODE_HEAD;
1852         struct nfsd4_op *op;
1853         bool cachethis = false;
1854         int auth_slack= argp->rqstp->rq_auth_slack;
1855         int max_reply = auth_slack + 8; /* opcnt, status */
1856         int readcount = 0;
1857         int readbytes = 0;
1858         int i;
1859
1860         READ_BUF(4);
1861         argp->taglen = be32_to_cpup(p++);
1862         READ_BUF(argp->taglen);
1863         SAVEMEM(argp->tag, argp->taglen);
1864         READ_BUF(8);
1865         argp->minorversion = be32_to_cpup(p++);
1866         argp->opcnt = be32_to_cpup(p++);
1867         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1868
1869         if (argp->taglen > NFSD4_MAX_TAGLEN)
1870                 goto xdr_error;
1871         if (argp->opcnt > 100)
1872                 goto xdr_error;
1873
1874         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1875                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1876                 if (!argp->ops) {
1877                         argp->ops = argp->iops;
1878                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1879                         goto xdr_error;
1880                 }
1881         }
1882
1883         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1884                 argp->opcnt = 0;
1885
1886         for (i = 0; i < argp->opcnt; i++) {
1887                 op = &argp->ops[i];
1888                 op->replay = NULL;
1889
1890                 READ_BUF(4);
1891                 op->opnum = be32_to_cpup(p++);
1892
1893                 if (nfsd4_opnum_in_range(argp, op))
1894                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1895                 else {
1896                         op->opnum = OP_ILLEGAL;
1897                         op->status = nfserr_op_illegal;
1898                 }
1899                 /*
1900                  * We'll try to cache the result in the DRC if any one
1901                  * op in the compound wants to be cached:
1902                  */
1903                 cachethis |= nfsd4_cache_this_op(op);
1904
1905                 if (op->opnum == OP_READ) {
1906                         readcount++;
1907                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1908                 } else
1909                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1910                 /*
1911                  * OP_LOCK may return a conflicting lock.  (Special case
1912                  * because it will just skip encoding this if it runs
1913                  * out of xdr buffer space, and it is the only operation
1914                  * that behaves this way.)
1915                  */
1916                 if (op->opnum == OP_LOCK)
1917                         max_reply += NFS4_OPAQUE_LIMIT;
1918
1919                 if (op->status) {
1920                         argp->opcnt = i+1;
1921                         break;
1922                 }
1923         }
1924         /* Sessions make the DRC unnecessary: */
1925         if (argp->minorversion)
1926                 cachethis = false;
1927         svc_reserve(argp->rqstp, max_reply + readbytes);
1928         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1929
1930         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1931                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1932
1933         DECODE_TAIL;
1934 }
1935
1936 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1937 {
1938         if (IS_I_VERSION(inode)) {
1939                 p = xdr_encode_hyper(p, inode->i_version);
1940         } else {
1941                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1942                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1943         }
1944         return p;
1945 }
1946
1947 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1948 {
1949         *p++ = cpu_to_be32(c->atomic);
1950         if (c->change_supported) {
1951                 p = xdr_encode_hyper(p, c->before_change);
1952                 p = xdr_encode_hyper(p, c->after_change);
1953         } else {
1954                 *p++ = cpu_to_be32(c->before_ctime_sec);
1955                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1956                 *p++ = cpu_to_be32(c->after_ctime_sec);
1957                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1958         }
1959         return p;
1960 }
1961
1962 /* Encode as an array of strings the string given with components
1963  * separated @sep, escaped with esc_enter and esc_exit.
1964  */
1965 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1966                                           char *components, char esc_enter,
1967                                           char esc_exit)
1968 {
1969         __be32 *p;
1970         __be32 pathlen;
1971         int pathlen_offset;
1972         int strlen, count=0;
1973         char *str, *end, *next;
1974
1975         dprintk("nfsd4_encode_components(%s)\n", components);
1976
1977         pathlen_offset = xdr->buf->len;
1978         p = xdr_reserve_space(xdr, 4);
1979         if (!p)
1980                 return nfserr_resource;
1981         p++; /* We will fill this in with @count later */
1982
1983         end = str = components;
1984         while (*end) {
1985                 bool found_esc = false;
1986
1987                 /* try to parse as esc_start, ..., esc_end, sep */
1988                 if (*str == esc_enter) {
1989                         for (; *end && (*end != esc_exit); end++)
1990                                 /* find esc_exit or end of string */;
1991                         next = end + 1;
1992                         if (*end && (!*next || *next == sep)) {
1993                                 str++;
1994                                 found_esc = true;
1995                         }
1996                 }
1997
1998                 if (!found_esc)
1999                         for (; *end && (*end != sep); end++)
2000                                 /* find sep or end of string */;
2001
2002                 strlen = end - str;
2003                 if (strlen) {
2004                         p = xdr_reserve_space(xdr, strlen + 4);
2005                         if (!p)
2006                                 return nfserr_resource;
2007                         p = xdr_encode_opaque(p, str, strlen);
2008                         count++;
2009                 }
2010                 else
2011                         end++;
2012                 if (found_esc)
2013                         end = next;
2014
2015                 str = end;
2016         }
2017         pathlen = htonl(count);
2018         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2019         return 0;
2020 }
2021
2022 /* Encode as an array of strings the string given with components
2023  * separated @sep.
2024  */
2025 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2026                                       char *components)
2027 {
2028         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2029 }
2030
2031 /*
2032  * encode a location element of a fs_locations structure
2033  */
2034 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2035                                         struct nfsd4_fs_location *location)
2036 {
2037         __be32 status;
2038
2039         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2040                                                 '[', ']');
2041         if (status)
2042                 return status;
2043         status = nfsd4_encode_components(xdr, '/', location->path);
2044         if (status)
2045                 return status;
2046         return 0;
2047 }
2048
2049 /*
2050  * Encode a path in RFC3530 'pathname4' format
2051  */
2052 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2053                                 const struct path *root,
2054                                 const struct path *path)
2055 {
2056         struct path cur = *path;
2057         __be32 *p;
2058         struct dentry **components = NULL;
2059         unsigned int ncomponents = 0;
2060         __be32 err = nfserr_jukebox;
2061
2062         dprintk("nfsd4_encode_components(");
2063
2064         path_get(&cur);
2065         /* First walk the path up to the nfsd root, and store the
2066          * dentries/path components in an array.
2067          */
2068         for (;;) {
2069                 if (path_equal(&cur, root))
2070                         break;
2071                 if (cur.dentry == cur.mnt->mnt_root) {
2072                         if (follow_up(&cur))
2073                                 continue;
2074                         goto out_free;
2075                 }
2076                 if ((ncomponents & 15) == 0) {
2077                         struct dentry **new;
2078                         new = krealloc(components,
2079                                         sizeof(*new) * (ncomponents + 16),
2080                                         GFP_KERNEL);
2081                         if (!new)
2082                                 goto out_free;
2083                         components = new;
2084                 }
2085                 components[ncomponents++] = cur.dentry;
2086                 cur.dentry = dget_parent(cur.dentry);
2087         }
2088         err = nfserr_resource;
2089         p = xdr_reserve_space(xdr, 4);
2090         if (!p)
2091                 goto out_free;
2092         *p++ = cpu_to_be32(ncomponents);
2093
2094         while (ncomponents) {
2095                 struct dentry *dentry = components[ncomponents - 1];
2096                 unsigned int len;
2097
2098                 spin_lock(&dentry->d_lock);
2099                 len = dentry->d_name.len;
2100                 p = xdr_reserve_space(xdr, len + 4);
2101                 if (!p) {
2102                         spin_unlock(&dentry->d_lock);
2103                         goto out_free;
2104                 }
2105                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2106                 dprintk("/%pd", dentry);
2107                 spin_unlock(&dentry->d_lock);
2108                 dput(dentry);
2109                 ncomponents--;
2110         }
2111
2112         err = 0;
2113 out_free:
2114         dprintk(")\n");
2115         while (ncomponents)
2116                 dput(components[--ncomponents]);
2117         kfree(components);
2118         path_put(&cur);
2119         return err;
2120 }
2121
2122 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2123                         struct svc_rqst *rqstp, const struct path *path)
2124 {
2125         struct svc_export *exp_ps;
2126         __be32 res;
2127
2128         exp_ps = rqst_find_fsidzero_export(rqstp);
2129         if (IS_ERR(exp_ps))
2130                 return nfserrno(PTR_ERR(exp_ps));
2131         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2132         exp_put(exp_ps);
2133         return res;
2134 }
2135
2136 /*
2137  *  encode a fs_locations structure
2138  */
2139 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2140                         struct svc_rqst *rqstp, struct svc_export *exp)
2141 {
2142         __be32 status;
2143         int i;
2144         __be32 *p;
2145         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2146
2147         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2148         if (status)
2149                 return status;
2150         p = xdr_reserve_space(xdr, 4);
2151         if (!p)
2152                 return nfserr_resource;
2153         *p++ = cpu_to_be32(fslocs->locations_count);
2154         for (i=0; i<fslocs->locations_count; i++) {
2155                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2156                 if (status)
2157                         return status;
2158         }
2159         return 0;
2160 }
2161
2162 static u32 nfs4_file_type(umode_t mode)
2163 {
2164         switch (mode & S_IFMT) {
2165         case S_IFIFO:   return NF4FIFO;
2166         case S_IFCHR:   return NF4CHR;
2167         case S_IFDIR:   return NF4DIR;
2168         case S_IFBLK:   return NF4BLK;
2169         case S_IFLNK:   return NF4LNK;
2170         case S_IFREG:   return NF4REG;
2171         case S_IFSOCK:  return NF4SOCK;
2172         default:        return NF4BAD;
2173         };
2174 }
2175
2176 static inline __be32
2177 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2178                      struct nfs4_ace *ace)
2179 {
2180         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2181                 return nfs4_acl_write_who(xdr, ace->whotype);
2182         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2183                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2184         else
2185                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2186 }
2187
2188 static inline __be32
2189 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2190 {
2191         __be32          *p;
2192         unsigned long   i = hweight_long(layout_types);
2193
2194         p = xdr_reserve_space(xdr, 4 + 4 * i);
2195         if (!p)
2196                 return nfserr_resource;
2197
2198         *p++ = cpu_to_be32(i);
2199
2200         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2201                 if (layout_types & (1 << i))
2202                         *p++ = cpu_to_be32(i);
2203
2204         return 0;
2205 }
2206
2207 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2208                               FATTR4_WORD0_RDATTR_ERROR)
2209 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2210 #define WORD2_ABSENT_FS_ATTRS 0
2211
2212 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2213 static inline __be32
2214 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2215                             void *context, int len)
2216 {
2217         __be32 *p;
2218
2219         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2220         if (!p)
2221                 return nfserr_resource;
2222
2223         /*
2224          * For now we use a 0 here to indicate the null translation; in
2225          * the future we may place a call to translation code here.
2226          */
2227         *p++ = cpu_to_be32(0); /* lfs */
2228         *p++ = cpu_to_be32(0); /* pi */
2229         p = xdr_encode_opaque(p, context, len);
2230         return 0;
2231 }
2232 #else
2233 static inline __be32
2234 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2235                             void *context, int len)
2236 { return 0; }
2237 #endif
2238
2239 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2240 {
2241         /* As per referral draft:  */
2242         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2243             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2244                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2245                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2246                         *rdattr_err = NFSERR_MOVED;
2247                 else
2248                         return nfserr_moved;
2249         }
2250         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2251         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2252         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2253         return 0;
2254 }
2255
2256
2257 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2258 {
2259         struct path path = exp->ex_path;
2260         int err;
2261
2262         path_get(&path);
2263         while (follow_up(&path)) {
2264                 if (path.dentry != path.mnt->mnt_root)
2265                         break;
2266         }
2267         err = vfs_getattr(&path, stat);
2268         path_put(&path);
2269         return err;
2270 }
2271
2272 static __be32
2273 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2274 {
2275         __be32 *p;
2276
2277         if (bmval2) {
2278                 p = xdr_reserve_space(xdr, 16);
2279                 if (!p)
2280                         goto out_resource;
2281                 *p++ = cpu_to_be32(3);
2282                 *p++ = cpu_to_be32(bmval0);
2283                 *p++ = cpu_to_be32(bmval1);
2284                 *p++ = cpu_to_be32(bmval2);
2285         } else if (bmval1) {
2286                 p = xdr_reserve_space(xdr, 12);
2287                 if (!p)
2288                         goto out_resource;
2289                 *p++ = cpu_to_be32(2);
2290                 *p++ = cpu_to_be32(bmval0);
2291                 *p++ = cpu_to_be32(bmval1);
2292         } else {
2293                 p = xdr_reserve_space(xdr, 8);
2294                 if (!p)
2295                         goto out_resource;
2296                 *p++ = cpu_to_be32(1);
2297                 *p++ = cpu_to_be32(bmval0);
2298         }
2299
2300         return 0;
2301 out_resource:
2302         return nfserr_resource;
2303 }
2304
2305 /*
2306  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2307  * ourselves.
2308  */
2309 static __be32
2310 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2311                 struct svc_export *exp,
2312                 struct dentry *dentry, u32 *bmval,
2313                 struct svc_rqst *rqstp, int ignore_crossmnt)
2314 {
2315         u32 bmval0 = bmval[0];
2316         u32 bmval1 = bmval[1];
2317         u32 bmval2 = bmval[2];
2318         struct kstat stat;
2319         struct svc_fh *tempfh = NULL;
2320         struct kstatfs statfs;
2321         __be32 *p;
2322         int starting_len = xdr->buf->len;
2323         int attrlen_offset;
2324         __be32 attrlen;
2325         u32 dummy;
2326         u64 dummy64;
2327         u32 rdattr_err = 0;
2328         __be32 status;
2329         int err;
2330         struct nfs4_acl *acl = NULL;
2331         void *context = NULL;
2332         int contextlen;
2333         bool contextsupport = false;
2334         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2335         u32 minorversion = resp->cstate.minorversion;
2336         struct path path = {
2337                 .mnt    = exp->ex_path.mnt,
2338                 .dentry = dentry,
2339         };
2340         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2341
2342         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2343         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2344         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2345         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2346
2347         if (exp->ex_fslocs.migrated) {
2348                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2349                 if (status)
2350                         goto out;
2351         }
2352
2353         err = vfs_getattr(&path, &stat);
2354         if (err)
2355                 goto out_nfserr;
2356         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2357                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2358             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2359                        FATTR4_WORD1_SPACE_TOTAL))) {
2360                 err = vfs_statfs(&path, &statfs);
2361                 if (err)
2362                         goto out_nfserr;
2363         }
2364         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2365                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2366                 status = nfserr_jukebox;
2367                 if (!tempfh)
2368                         goto out;
2369                 fh_init(tempfh, NFS4_FHSIZE);
2370                 status = fh_compose(tempfh, exp, dentry, NULL);
2371                 if (status)
2372                         goto out;
2373                 fhp = tempfh;
2374         }
2375         if (bmval0 & FATTR4_WORD0_ACL) {
2376                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2377                 if (err == -EOPNOTSUPP)
2378                         bmval0 &= ~FATTR4_WORD0_ACL;
2379                 else if (err == -EINVAL) {
2380                         status = nfserr_attrnotsupp;
2381                         goto out;
2382                 } else if (err != 0)
2383                         goto out_nfserr;
2384         }
2385
2386 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2387         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2388              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2389                 err = security_inode_getsecctx(d_inode(dentry),
2390                                                 &context, &contextlen);
2391                 contextsupport = (err == 0);
2392                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2393                         if (err == -EOPNOTSUPP)
2394                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2395                         else if (err)
2396                                 goto out_nfserr;
2397                 }
2398         }
2399 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2400
2401         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2402         if (status)
2403                 goto out;
2404
2405         attrlen_offset = xdr->buf->len;
2406         p = xdr_reserve_space(xdr, 4);
2407         if (!p)
2408                 goto out_resource;
2409         p++;                /* to be backfilled later */
2410
2411         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2412                 u32 word0 = nfsd_suppattrs0(minorversion);
2413                 u32 word1 = nfsd_suppattrs1(minorversion);
2414                 u32 word2 = nfsd_suppattrs2(minorversion);
2415
2416                 if (!IS_POSIXACL(dentry->d_inode))
2417                         word0 &= ~FATTR4_WORD0_ACL;
2418                 if (!contextsupport)
2419                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2420                 if (!word2) {
2421                         p = xdr_reserve_space(xdr, 12);
2422                         if (!p)
2423                                 goto out_resource;
2424                         *p++ = cpu_to_be32(2);
2425                         *p++ = cpu_to_be32(word0);
2426                         *p++ = cpu_to_be32(word1);
2427                 } else {
2428                         p = xdr_reserve_space(xdr, 16);
2429                         if (!p)
2430                                 goto out_resource;
2431                         *p++ = cpu_to_be32(3);
2432                         *p++ = cpu_to_be32(word0);
2433                         *p++ = cpu_to_be32(word1);
2434                         *p++ = cpu_to_be32(word2);
2435                 }
2436         }
2437         if (bmval0 & FATTR4_WORD0_TYPE) {
2438                 p = xdr_reserve_space(xdr, 4);
2439                 if (!p)
2440                         goto out_resource;
2441                 dummy = nfs4_file_type(stat.mode);
2442                 if (dummy == NF4BAD) {
2443                         status = nfserr_serverfault;
2444                         goto out;
2445                 }
2446                 *p++ = cpu_to_be32(dummy);
2447         }
2448         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2449                 p = xdr_reserve_space(xdr, 4);
2450                 if (!p)
2451                         goto out_resource;
2452                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2453                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2454                 else
2455                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2456                                                 NFS4_FH_VOL_RENAME);
2457         }
2458         if (bmval0 & FATTR4_WORD0_CHANGE) {
2459                 p = xdr_reserve_space(xdr, 8);
2460                 if (!p)
2461                         goto out_resource;
2462                 p = encode_change(p, &stat, d_inode(dentry));
2463         }
2464         if (bmval0 & FATTR4_WORD0_SIZE) {
2465                 p = xdr_reserve_space(xdr, 8);
2466                 if (!p)
2467                         goto out_resource;
2468                 p = xdr_encode_hyper(p, stat.size);
2469         }
2470         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2471                 p = xdr_reserve_space(xdr, 4);
2472                 if (!p)
2473                         goto out_resource;
2474                 *p++ = cpu_to_be32(1);
2475         }
2476         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2477                 p = xdr_reserve_space(xdr, 4);
2478                 if (!p)
2479                         goto out_resource;
2480                 *p++ = cpu_to_be32(1);
2481         }
2482         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2483                 p = xdr_reserve_space(xdr, 4);
2484                 if (!p)
2485                         goto out_resource;
2486                 *p++ = cpu_to_be32(0);
2487         }
2488         if (bmval0 & FATTR4_WORD0_FSID) {
2489                 p = xdr_reserve_space(xdr, 16);
2490                 if (!p)
2491                         goto out_resource;
2492                 if (exp->ex_fslocs.migrated) {
2493                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2494                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2495                 } else switch(fsid_source(fhp)) {
2496                 case FSIDSOURCE_FSID:
2497                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2498                         p = xdr_encode_hyper(p, (u64)0);
2499                         break;
2500                 case FSIDSOURCE_DEV:
2501                         *p++ = cpu_to_be32(0);
2502                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2503                         *p++ = cpu_to_be32(0);
2504                         *p++ = cpu_to_be32(MINOR(stat.dev));
2505                         break;
2506                 case FSIDSOURCE_UUID:
2507                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2508                                                                 EX_UUID_LEN);
2509                         break;
2510                 }
2511         }
2512         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2513                 p = xdr_reserve_space(xdr, 4);
2514                 if (!p)
2515                         goto out_resource;
2516                 *p++ = cpu_to_be32(0);
2517         }
2518         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2519                 p = xdr_reserve_space(xdr, 4);
2520                 if (!p)
2521                         goto out_resource;
2522                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2523         }
2524         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2525                 p = xdr_reserve_space(xdr, 4);
2526                 if (!p)
2527                         goto out_resource;
2528                 *p++ = cpu_to_be32(rdattr_err);
2529         }
2530         if (bmval0 & FATTR4_WORD0_ACL) {
2531                 struct nfs4_ace *ace;
2532
2533                 if (acl == NULL) {
2534                         p = xdr_reserve_space(xdr, 4);
2535                         if (!p)
2536                                 goto out_resource;
2537
2538                         *p++ = cpu_to_be32(0);
2539                         goto out_acl;
2540                 }
2541                 p = xdr_reserve_space(xdr, 4);
2542                 if (!p)
2543                         goto out_resource;
2544                 *p++ = cpu_to_be32(acl->naces);
2545
2546                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2547                         p = xdr_reserve_space(xdr, 4*3);
2548                         if (!p)
2549                                 goto out_resource;
2550                         *p++ = cpu_to_be32(ace->type);
2551                         *p++ = cpu_to_be32(ace->flag);
2552                         *p++ = cpu_to_be32(ace->access_mask &
2553                                                         NFS4_ACE_MASK_ALL);
2554                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2555                         if (status)
2556                                 goto out;
2557                 }
2558         }
2559 out_acl:
2560         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2561                 p = xdr_reserve_space(xdr, 4);
2562                 if (!p)
2563                         goto out_resource;
2564                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2565                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2566         }
2567         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2568                 p = xdr_reserve_space(xdr, 4);
2569                 if (!p)
2570                         goto out_resource;
2571                 *p++ = cpu_to_be32(1);
2572         }
2573         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2574                 p = xdr_reserve_space(xdr, 4);
2575                 if (!p)
2576                         goto out_resource;
2577                 *p++ = cpu_to_be32(0);
2578         }
2579         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2580                 p = xdr_reserve_space(xdr, 4);
2581                 if (!p)
2582                         goto out_resource;
2583                 *p++ = cpu_to_be32(1);
2584         }
2585         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2586                 p = xdr_reserve_space(xdr, 4);
2587                 if (!p)
2588                         goto out_resource;
2589                 *p++ = cpu_to_be32(1);
2590         }
2591         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2592                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2593                 if (!p)
2594                         goto out_resource;
2595                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2596                                         fhp->fh_handle.fh_size);
2597         }
2598         if (bmval0 & FATTR4_WORD0_FILEID) {
2599                 p = xdr_reserve_space(xdr, 8);
2600                 if (!p)
2601                         goto out_resource;
2602                 p = xdr_encode_hyper(p, stat.ino);
2603         }
2604         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2605                 p = xdr_reserve_space(xdr, 8);
2606                 if (!p)
2607                         goto out_resource;
2608                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2609         }
2610         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2611                 p = xdr_reserve_space(xdr, 8);
2612                 if (!p)
2613                         goto out_resource;
2614                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2615         }
2616         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2617                 p = xdr_reserve_space(xdr, 8);
2618                 if (!p)
2619                         goto out_resource;
2620                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2621         }
2622         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2623                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2624                 if (status)
2625                         goto out;
2626         }
2627         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2628                 p = xdr_reserve_space(xdr, 4);
2629                 if (!p)
2630                         goto out_resource;
2631                 *p++ = cpu_to_be32(1);
2632         }
2633         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2634                 p = xdr_reserve_space(xdr, 8);
2635                 if (!p)
2636                         goto out_resource;
2637                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2638         }
2639         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2640                 p = xdr_reserve_space(xdr, 4);
2641                 if (!p)
2642                         goto out_resource;
2643                 *p++ = cpu_to_be32(255);
2644         }
2645         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2646                 p = xdr_reserve_space(xdr, 4);
2647                 if (!p)
2648                         goto out_resource;
2649                 *p++ = cpu_to_be32(statfs.f_namelen);
2650         }
2651         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2652                 p = xdr_reserve_space(xdr, 8);
2653                 if (!p)
2654                         goto out_resource;
2655                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2656         }
2657         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2658                 p = xdr_reserve_space(xdr, 8);
2659                 if (!p)
2660                         goto out_resource;
2661                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2662         }
2663         if (bmval1 & FATTR4_WORD1_MODE) {
2664                 p = xdr_reserve_space(xdr, 4);
2665                 if (!p)
2666                         goto out_resource;
2667                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2668         }
2669         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2670                 p = xdr_reserve_space(xdr, 4);
2671                 if (!p)
2672                         goto out_resource;
2673                 *p++ = cpu_to_be32(1);
2674         }
2675         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2676                 p = xdr_reserve_space(xdr, 4);
2677                 if (!p)
2678                         goto out_resource;
2679                 *p++ = cpu_to_be32(stat.nlink);
2680         }
2681         if (bmval1 & FATTR4_WORD1_OWNER) {
2682                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2683                 if (status)
2684                         goto out;
2685         }
2686         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2687                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2688                 if (status)
2689                         goto out;
2690         }
2691         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2692                 p = xdr_reserve_space(xdr, 8);
2693                 if (!p)
2694                         goto out_resource;
2695                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2696                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2697         }
2698         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2699                 p = xdr_reserve_space(xdr, 8);
2700                 if (!p)
2701                         goto out_resource;
2702                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2703                 p = xdr_encode_hyper(p, dummy64);
2704         }
2705         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2706                 p = xdr_reserve_space(xdr, 8);
2707                 if (!p)
2708                         goto out_resource;
2709                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2710                 p = xdr_encode_hyper(p, dummy64);
2711         }
2712         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2713                 p = xdr_reserve_space(xdr, 8);
2714                 if (!p)
2715                         goto out_resource;
2716                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2717                 p = xdr_encode_hyper(p, dummy64);
2718         }
2719         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2720                 p = xdr_reserve_space(xdr, 8);
2721                 if (!p)
2722                         goto out_resource;
2723                 dummy64 = (u64)stat.blocks << 9;
2724                 p = xdr_encode_hyper(p, dummy64);
2725         }
2726         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2727                 p = xdr_reserve_space(xdr, 12);
2728                 if (!p)
2729                         goto out_resource;
2730                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2731                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2732         }
2733         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2734                 p = xdr_reserve_space(xdr, 12);
2735                 if (!p)
2736                         goto out_resource;
2737                 *p++ = cpu_to_be32(0);
2738                 *p++ = cpu_to_be32(1);
2739                 *p++ = cpu_to_be32(0);
2740         }
2741         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2742                 p = xdr_reserve_space(xdr, 12);
2743                 if (!p)
2744                         goto out_resource;
2745                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2746                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2747         }
2748         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2749                 p = xdr_reserve_space(xdr, 12);
2750                 if (!p)
2751                         goto out_resource;
2752                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2753                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2754         }
2755         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2756                 struct kstat parent_stat;
2757                 u64 ino = stat.ino;
2758
2759                 p = xdr_reserve_space(xdr, 8);
2760                 if (!p)
2761                         goto out_resource;
2762                 /*
2763                  * Get parent's attributes if not ignoring crossmount
2764                  * and this is the root of a cross-mounted filesystem.
2765                  */
2766                 if (ignore_crossmnt == 0 &&
2767                     dentry == exp->ex_path.mnt->mnt_root) {
2768                         err = get_parent_attributes(exp, &parent_stat);
2769                         if (err)
2770                                 goto out_nfserr;
2771                         ino = parent_stat.ino;
2772                 }
2773                 p = xdr_encode_hyper(p, ino);
2774         }
2775 #ifdef CONFIG_NFSD_PNFS
2776         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2777                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2778                 if (status)
2779                         goto out;
2780         }
2781
2782         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2783                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2784                 if (status)
2785                         goto out;
2786         }
2787
2788         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2789                 p = xdr_reserve_space(xdr, 4);
2790                 if (!p)
2791                         goto out_resource;
2792                 *p++ = cpu_to_be32(stat.blksize);
2793         }
2794 #endif /* CONFIG_NFSD_PNFS */
2795         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2796                 u32 supp[3];
2797
2798                 supp[0] = nfsd_suppattrs0(minorversion);
2799                 supp[1] = nfsd_suppattrs1(minorversion);
2800                 supp[2] = nfsd_suppattrs2(minorversion);
2801                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2802                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2803                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2804
2805                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2806                 if (status)
2807                         goto out;
2808         }
2809
2810         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2811                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2812                                                                 contextlen);
2813                 if (status)
2814                         goto out;
2815         }
2816
2817         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2818         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2819         status = nfs_ok;
2820
2821 out:
2822 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2823         if (context)
2824                 security_release_secctx(context, contextlen);
2825 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2826         kfree(acl);
2827         if (tempfh) {
2828                 fh_put(tempfh);
2829                 kfree(tempfh);
2830         }
2831         if (status)
2832                 xdr_truncate_encode(xdr, starting_len);
2833         return status;
2834 out_nfserr:
2835         status = nfserrno(err);
2836         goto out;
2837 out_resource:
2838         status = nfserr_resource;
2839         goto out;
2840 }
2841
2842 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2843                                 struct xdr_buf *buf, __be32 *p, int bytes)
2844 {
2845         xdr->scratch.iov_len = 0;
2846         memset(buf, 0, sizeof(struct xdr_buf));
2847         buf->head[0].iov_base = p;
2848         buf->head[0].iov_len = 0;
2849         buf->len = 0;
2850         xdr->buf = buf;
2851         xdr->iov = buf->head;
2852         xdr->p = p;
2853         xdr->end = (void *)p + bytes;
2854         buf->buflen = bytes;
2855 }
2856
2857 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2858                         struct svc_fh *fhp, struct svc_export *exp,
2859                         struct dentry *dentry, u32 *bmval,
2860                         struct svc_rqst *rqstp, int ignore_crossmnt)
2861 {
2862         struct xdr_buf dummy;
2863         struct xdr_stream xdr;
2864         __be32 ret;
2865
2866         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2867         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2868                                                         ignore_crossmnt);
2869         *p = xdr.p;
2870         return ret;
2871 }
2872
2873 static inline int attributes_need_mount(u32 *bmval)
2874 {
2875         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2876                 return 1;
2877         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2878                 return 1;
2879         return 0;
2880 }
2881
2882 static __be32
2883 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2884                         const char *name, int namlen)
2885 {
2886         struct svc_export *exp = cd->rd_fhp->fh_export;
2887         struct dentry *dentry;
2888         __be32 nfserr;
2889         int ignore_crossmnt = 0;
2890
2891         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2892         if (IS_ERR(dentry))
2893                 return nfserrno(PTR_ERR(dentry));
2894         if (d_really_is_negative(dentry)) {
2895                 /*
2896                  * we're not holding the i_mutex here, so there's
2897                  * a window where this directory entry could have gone
2898                  * away.
2899                  */
2900                 dput(dentry);
2901                 return nfserr_noent;
2902         }
2903
2904         exp_get(exp);
2905         /*
2906          * In the case of a mountpoint, the client may be asking for
2907          * attributes that are only properties of the underlying filesystem
2908          * as opposed to the cross-mounted file system. In such a case,
2909          * we will not follow the cross mount and will fill the attribtutes
2910          * directly from the mountpoint dentry.
2911          */
2912         if (nfsd_mountpoint(dentry, exp)) {
2913                 int err;
2914
2915                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2916                                 && !attributes_need_mount(cd->rd_bmval)) {
2917                         ignore_crossmnt = 1;
2918                         goto out_encode;
2919                 }
2920                 /*
2921                  * Why the heck aren't we just using nfsd_lookup??
2922                  * Different "."/".." handling?  Something else?
2923                  * At least, add a comment here to explain....
2924                  */
2925                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2926                 if (err) {
2927                         nfserr = nfserrno(err);
2928                         goto out_put;
2929                 }
2930                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2931                 if (nfserr)
2932                         goto out_put;
2933
2934         }
2935 out_encode:
2936         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2937                                         cd->rd_rqstp, ignore_crossmnt);
2938 out_put:
2939         dput(dentry);
2940         exp_put(exp);
2941         return nfserr;
2942 }
2943
2944 static __be32 *
2945 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2946 {
2947         __be32 *p;
2948
2949         p = xdr_reserve_space(xdr, 20);
2950         if (!p)
2951                 return NULL;
2952         *p++ = htonl(2);
2953         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2954         *p++ = htonl(0);                         /* bmval1 */
2955
2956         *p++ = htonl(4);     /* attribute length */
2957         *p++ = nfserr;       /* no htonl */
2958         return p;
2959 }
2960
2961 static int
2962 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2963                     loff_t offset, u64 ino, unsigned int d_type)
2964 {
2965         struct readdir_cd *ccd = ccdv;
2966         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2967         struct xdr_stream *xdr = cd->xdr;
2968         int start_offset = xdr->buf->len;
2969         int cookie_offset;
2970         u32 name_and_cookie;
2971         int entry_bytes;
2972         __be32 nfserr = nfserr_toosmall;
2973         __be64 wire_offset;
2974         __be32 *p;
2975
2976         /* In nfsv4, "." and ".." never make it onto the wire.. */
2977         if (name && isdotent(name, namlen)) {
2978                 cd->common.err = nfs_ok;
2979                 return 0;
2980         }
2981
2982         if (cd->cookie_offset) {
2983                 wire_offset = cpu_to_be64(offset);
2984                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2985                                                         &wire_offset, 8);
2986         }
2987
2988         p = xdr_reserve_space(xdr, 4);
2989         if (!p)
2990                 goto fail;
2991         *p++ = xdr_one;                             /* mark entry present */
2992         cookie_offset = xdr->buf->len;
2993         p = xdr_reserve_space(xdr, 3*4 + namlen);
2994         if (!p)
2995                 goto fail;
2996         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2997         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2998
2999         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3000         switch (nfserr) {
3001         case nfs_ok:
3002                 break;
3003         case nfserr_resource:
3004                 nfserr = nfserr_toosmall;
3005                 goto fail;
3006         case nfserr_noent:
3007                 xdr_truncate_encode(xdr, start_offset);
3008                 goto skip_entry;
3009         default:
3010                 /*
3011                  * If the client requested the RDATTR_ERROR attribute,
3012                  * we stuff the error code into this attribute
3013                  * and continue.  If this attribute was not requested,
3014                  * then in accordance with the spec, we fail the
3015                  * entire READDIR operation(!)
3016                  */
3017                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3018                         goto fail;
3019                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3020                 if (p == NULL) {
3021                         nfserr = nfserr_toosmall;
3022                         goto fail;
3023                 }
3024         }
3025         nfserr = nfserr_toosmall;
3026         entry_bytes = xdr->buf->len - start_offset;
3027         if (entry_bytes > cd->rd_maxcount)
3028                 goto fail;
3029         cd->rd_maxcount -= entry_bytes;
3030         /*
3031          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3032          * let's always let through the first entry, at least:
3033          */
3034         if (!cd->rd_dircount)
3035                 goto fail;
3036         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3037         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3038                 goto fail;
3039         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3040
3041         cd->cookie_offset = cookie_offset;
3042 skip_entry:
3043         cd->common.err = nfs_ok;
3044         return 0;
3045 fail:
3046         xdr_truncate_encode(xdr, start_offset);
3047         cd->common.err = nfserr;
3048         return -EINVAL;
3049 }
3050
3051 static __be32
3052 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3053 {
3054         __be32 *p;
3055
3056         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3057         if (!p)
3058                 return nfserr_resource;
3059         *p++ = cpu_to_be32(sid->si_generation);
3060         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3061                                         sizeof(stateid_opaque_t));
3062         return 0;
3063 }
3064
3065 static __be32
3066 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3067 {
3068         struct xdr_stream *xdr = &resp->xdr;
3069         __be32 *p;
3070
3071         if (!nfserr) {
3072                 p = xdr_reserve_space(xdr, 8);
3073                 if (!p)
3074                         return nfserr_resource;
3075                 *p++ = cpu_to_be32(access->ac_supported);
3076                 *p++ = cpu_to_be32(access->ac_resp_access);
3077         }
3078         return nfserr;
3079 }
3080
3081 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3082 {
3083         struct xdr_stream *xdr = &resp->xdr;
3084         __be32 *p;
3085
3086         if (!nfserr) {
3087                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3088                 if (!p)
3089                         return nfserr_resource;
3090                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3091                                                 NFS4_MAX_SESSIONID_LEN);
3092                 *p++ = cpu_to_be32(bcts->dir);
3093                 /* Upshifting from TCP to RDMA is not supported */
3094                 *p++ = cpu_to_be32(0);
3095         }
3096         return nfserr;
3097 }
3098
3099 static __be32
3100 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3101 {
3102         struct xdr_stream *xdr = &resp->xdr;
3103
3104         if (!nfserr)
3105                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3106
3107         return nfserr;
3108 }
3109
3110
3111 static __be32
3112 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3113 {
3114         struct xdr_stream *xdr = &resp->xdr;
3115         __be32 *p;
3116
3117         if (!nfserr) {
3118                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3119                 if (!p)
3120                         return nfserr_resource;
3121                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3122                                                 NFS4_VERIFIER_SIZE);
3123         }
3124         return nfserr;
3125 }
3126
3127 static __be32
3128 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3129 {
3130         struct xdr_stream *xdr = &resp->xdr;
3131         __be32 *p;
3132
3133         if (!nfserr) {
3134                 p = xdr_reserve_space(xdr, 20);
3135                 if (!p)
3136                         return nfserr_resource;
3137                 encode_cinfo(p, &create->cr_cinfo);
3138                 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3139                                 create->cr_bmval[1], create->cr_bmval[2]);
3140         }
3141         return nfserr;
3142 }
3143
3144 static __be32
3145 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3146 {
3147         struct svc_fh *fhp = getattr->ga_fhp;
3148         struct xdr_stream *xdr = &resp->xdr;
3149
3150         if (nfserr)
3151                 return nfserr;
3152
3153         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3154                                     getattr->ga_bmval,
3155                                     resp->rqstp, 0);
3156         return nfserr;
3157 }
3158
3159 static __be32
3160 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3161 {
3162         struct xdr_stream *xdr = &resp->xdr;
3163         struct svc_fh *fhp = *fhpp;
3164         unsigned int len;
3165         __be32 *p;
3166
3167         if (!nfserr) {
3168                 len = fhp->fh_handle.fh_size;
3169                 p = xdr_reserve_space(xdr, len + 4);
3170                 if (!p)
3171                         return nfserr_resource;
3172                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3173         }
3174         return nfserr;
3175 }
3176
3177 /*
3178 * Including all fields other than the name, a LOCK4denied structure requires
3179 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3180 */
3181 static __be32
3182 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3183 {
3184         struct xdr_netobj *conf = &ld->ld_owner;
3185         __be32 *p;
3186
3187 again:
3188         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3189         if (!p) {
3190                 /*
3191                  * Don't fail to return the result just because we can't
3192                  * return the conflicting open:
3193                  */
3194                 if (conf->len) {
3195                         kfree(conf->data);
3196                         conf->len = 0;
3197                         conf->data = NULL;
3198                         goto again;
3199                 }
3200                 return nfserr_resource;
3201         }
3202         p = xdr_encode_hyper(p, ld->ld_start);
3203         p = xdr_encode_hyper(p, ld->ld_length);
3204         *p++ = cpu_to_be32(ld->ld_type);
3205         if (conf->len) {
3206                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3207                 p = xdr_encode_opaque(p, conf->data, conf->len);
3208                 kfree(conf->data);
3209         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3210                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3211                 *p++ = cpu_to_be32(0); /* length of owner name */
3212         }
3213         return nfserr_denied;
3214 }
3215
3216 static __be32
3217 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3218 {
3219         struct xdr_stream *xdr = &resp->xdr;
3220
3221         if (!nfserr)
3222                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3223         else if (nfserr == nfserr_denied)
3224                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3225
3226         return nfserr;
3227 }
3228
3229 static __be32
3230 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3231 {
3232         struct xdr_stream *xdr = &resp->xdr;
3233
3234         if (nfserr == nfserr_denied)
3235                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3236         return nfserr;
3237 }
3238
3239 static __be32
3240 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3241 {
3242         struct xdr_stream *xdr = &resp->xdr;
3243
3244         if (!nfserr)
3245                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3246
3247         return nfserr;
3248 }
3249
3250
3251 static __be32
3252 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3253 {
3254         struct xdr_stream *xdr = &resp->xdr;
3255         __be32 *p;
3256
3257         if (!nfserr) {
3258                 p = xdr_reserve_space(xdr, 20);
3259                 if (!p)
3260                         return nfserr_resource;
3261                 p = encode_cinfo(p, &link->li_cinfo);
3262         }
3263         return nfserr;
3264 }
3265
3266
3267 static __be32
3268 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3269 {
3270         struct xdr_stream *xdr = &resp->xdr;
3271         __be32 *p;
3272
3273         if (nfserr)
3274                 goto out;
3275
3276         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3277         if (nfserr)
3278                 goto out;
3279         p = xdr_reserve_space(xdr, 24);
3280         if (!p)
3281                 return nfserr_resource;
3282         p = encode_cinfo(p, &open->op_cinfo);
3283         *p++ = cpu_to_be32(open->op_rflags);
3284
3285         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3286                                         open->op_bmval[2]);
3287         if (nfserr)
3288                 goto out;
3289
3290         p = xdr_reserve_space(xdr, 4);
3291         if (!p)
3292                 return nfserr_resource;
3293
3294         *p++ = cpu_to_be32(open->op_delegate_type);
3295         switch (open->op_delegate_type) {
3296         case NFS4_OPEN_DELEGATE_NONE:
3297                 break;
3298         case NFS4_OPEN_DELEGATE_READ:
3299                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3300                 if (nfserr)
3301                         return nfserr;
3302                 p = xdr_reserve_space(xdr, 20);
3303                 if (!p)
3304                         return nfserr_resource;
3305                 *p++ = cpu_to_be32(open->op_recall);
3306
3307                 /*
3308                  * TODO: ACE's in delegations
3309                  */
3310                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3311                 *p++ = cpu_to_be32(0);
3312                 *p++ = cpu_to_be32(0);
3313                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3314                 break;
3315         case NFS4_OPEN_DELEGATE_WRITE:
3316                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3317                 if (nfserr)
3318                         return nfserr;
3319                 p = xdr_reserve_space(xdr, 32);
3320                 if (!p)
3321                         return nfserr_resource;
3322                 *p++ = cpu_to_be32(0);
3323
3324                 /*
3325                  * TODO: space_limit's in delegations
3326                  */
3327                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3328                 *p++ = cpu_to_be32(~(u32)0);
3329                 *p++ = cpu_to_be32(~(u32)0);
3330
3331                 /*
3332                  * TODO: ACE's in delegations
3333                  */
3334                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3335                 *p++ = cpu_to_be32(0);
3336                 *p++ = cpu_to_be32(0);
3337                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3338                 break;
3339         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3340                 switch (open->op_why_no_deleg) {
3341                 case WND4_CONTENTION:
3342                 case WND4_RESOURCE:
3343                         p = xdr_reserve_space(xdr, 8);
3344                         if (!p)
3345                                 return nfserr_resource;
3346                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3347                         /* deleg signaling not supported yet: */
3348                         *p++ = cpu_to_be32(0);
3349                         break;
3350                 default:
3351                         p = xdr_reserve_space(xdr, 4);
3352                         if (!p)
3353                                 return nfserr_resource;
3354                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3355                 }
3356                 break;
3357         default:
3358                 BUG();
3359         }
3360         /* XXX save filehandle here */
3361 out:
3362         return nfserr;
3363 }
3364
3365 static __be32
3366 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3367 {
3368         struct xdr_stream *xdr = &resp->xdr;
3369
3370         if (!nfserr)
3371                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3372
3373         return nfserr;
3374 }
3375
3376 static __be32
3377 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3378 {
3379         struct xdr_stream *xdr = &resp->xdr;
3380
3381         if (!nfserr)
3382                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3383
3384         return nfserr;
3385 }
3386
3387 static __be32 nfsd4_encode_splice_read(
3388                                 struct nfsd4_compoundres *resp,
3389                                 struct nfsd4_read *read,
3390                                 struct file *file, unsigned long maxcount)
3391 {
3392         struct xdr_stream *xdr = &resp->xdr;
3393         struct xdr_buf *buf = xdr->buf;
3394         u32 eof;
3395         long len;
3396         int space_left;
3397         __be32 nfserr;
3398         __be32 *p = xdr->p - 2;
3399
3400         /* Make sure there will be room for padding if needed */
3401         if (xdr->end - xdr->p < 1)
3402                 return nfserr_resource;
3403
3404         len = maxcount;
3405         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3406                                   read->rd_offset, &maxcount);
3407         if (nfserr) {
3408                 /*
3409                  * nfsd_splice_actor may have already messed with the
3410                  * page length; reset it so as not to confuse
3411                  * xdr_truncate_encode:
3412                  */
3413                 buf->page_len = 0;
3414                 return nfserr;
3415         }
3416
3417         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3418                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3419
3420         *(p++) = htonl(eof);
3421         *(p++) = htonl(maxcount);
3422
3423         buf->page_len = maxcount;
3424         buf->len += maxcount;
3425         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3426                                                         / PAGE_SIZE;
3427
3428         /* Use rest of head for padding and remaining ops: */
3429         buf->tail[0].iov_base = xdr->p;
3430         buf->tail[0].iov_len = 0;
3431         xdr->iov = buf->tail;
3432         if (maxcount&3) {
3433                 int pad = 4 - (maxcount&3);
3434
3435                 *(xdr->p++) = 0;
3436
3437                 buf->tail[0].iov_base += maxcount&3;
3438                 buf->tail[0].iov_len = pad;
3439                 buf->len += pad;
3440         }
3441
3442         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3443                                 buf->buflen - buf->len);
3444         buf->buflen = buf->len + space_left;
3445         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3446
3447         return 0;
3448 }
3449
3450 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3451                                  struct nfsd4_read *read,
3452                                  struct file *file, unsigned long maxcount)
3453 {
3454         struct xdr_stream *xdr = &resp->xdr;
3455         u32 eof;
3456         int v;
3457         int starting_len = xdr->buf->len - 8;
3458         long len;
3459         int thislen;
3460         __be32 nfserr;
3461         __be32 tmp;
3462         __be32 *p;
3463         u32 zzz = 0;
3464         int pad;
3465
3466         len = maxcount;
3467         v = 0;
3468
3469         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3470         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3471         WARN_ON_ONCE(!p);
3472         resp->rqstp->rq_vec[v].iov_base = p;
3473         resp->rqstp->rq_vec[v].iov_len = thislen;
3474         v++;
3475         len -= thislen;
3476
3477         while (len) {
3478                 thislen = min_t(long, len, PAGE_SIZE);
3479                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3480                 WARN_ON_ONCE(!p);
3481                 resp->rqstp->rq_vec[v].iov_base = p;
3482                 resp->rqstp->rq_vec[v].iov_len = thislen;
3483                 v++;
3484                 len -= thislen;
3485         }
3486         read->rd_vlen = v;
3487
3488         len = maxcount;
3489         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3490                         read->rd_vlen, &maxcount);
3491         if (nfserr)
3492                 return nfserr;
3493         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3494
3495         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3496                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3497
3498         tmp = htonl(eof);
3499         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3500         tmp = htonl(maxcount);
3501         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3502
3503         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3504         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3505                                                                 &zzz, pad);
3506         return 0;
3507
3508 }
3509
3510 static __be32
3511 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3512                   struct nfsd4_read *read)
3513 {
3514         unsigned long maxcount;
3515         struct xdr_stream *xdr = &resp->xdr;
3516         struct file *file = read->rd_filp;
3517         int starting_len = xdr->buf->len;
3518         struct raparms *ra = NULL;
3519         __be32 *p;
3520
3521         if (nfserr)
3522                 goto out;
3523
3524         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3525         if (!p) {
3526                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3527                 nfserr = nfserr_resource;
3528                 goto out;
3529         }
3530         if (resp->xdr.buf->page_len &&
3531             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3532                 WARN_ON_ONCE(1);
3533                 nfserr = nfserr_resource;
3534                 goto out;
3535         }
3536         xdr_commit_encode(xdr);
3537
3538         maxcount = svc_max_payload(resp->rqstp);
3539         maxcount = min_t(unsigned long, maxcount,
3540                          (xdr->buf->buflen - xdr->buf->len));
3541         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3542
3543         if (read->rd_tmp_file)
3544                 ra = nfsd_init_raparms(file);
3545
3546         if (file->f_op->splice_read &&
3547             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3548                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3549         else
3550                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3551
3552         if (ra)
3553                 nfsd_put_raparams(file, ra);
3554
3555         if (nfserr)
3556                 xdr_truncate_encode(xdr, starting_len);
3557
3558 out:
3559         if (file)
3560                 fput(file);
3561         return nfserr;
3562 }
3563
3564 static __be32
3565 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3566 {
3567         int maxcount;
3568         __be32 wire_count;
3569         int zero = 0;
3570         struct xdr_stream *xdr = &resp->xdr;
3571         int length_offset = xdr->buf->len;
3572         __be32 *p;
3573
3574         if (nfserr)
3575                 return nfserr;
3576
3577         p = xdr_reserve_space(xdr, 4);
3578         if (!p)
3579                 return nfserr_resource;
3580         maxcount = PAGE_SIZE;
3581
3582         p = xdr_reserve_space(xdr, maxcount);
3583         if (!p)
3584                 return nfserr_resource;
3585         /*
3586          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3587          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3588          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3589          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3590          */
3591         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3592                                                 (char *)p, &maxcount);
3593         if (nfserr == nfserr_isdir)
3594                 nfserr = nfserr_inval;
3595         if (nfserr) {
3596                 xdr_truncate_encode(xdr, length_offset);
3597                 return nfserr;
3598         }
3599
3600         wire_count = htonl(maxcount);
3601         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3602         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3603         if (maxcount & 3)
3604                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3605                                                 &zero, 4 - (maxcount&3));
3606         return 0;
3607 }
3608
3609 static __be32
3610 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3611 {
3612         int maxcount;
3613         int bytes_left;
3614         loff_t offset;
3615         __be64 wire_offset;
3616         struct xdr_stream *xdr = &resp->xdr;
3617         int starting_len = xdr->buf->len;
3618         __be32 *p;
3619
3620         if (nfserr)
3621                 return nfserr;
3622
3623         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3624         if (!p)
3625                 return nfserr_resource;
3626
3627         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3628         *p++ = cpu_to_be32(0);
3629         *p++ = cpu_to_be32(0);
3630         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3631                                 - (char *)resp->xdr.buf->head[0].iov_base;
3632
3633         /*
3634          * Number of bytes left for directory entries allowing for the
3635          * final 8 bytes of the readdir and a following failed op:
3636          */
3637         bytes_left = xdr->buf->buflen - xdr->buf->len
3638                         - COMPOUND_ERR_SLACK_SPACE - 8;
3639         if (bytes_left < 0) {
3640                 nfserr = nfserr_resource;
3641                 goto err_no_verf;
3642         }
3643         maxcount = svc_max_payload(resp->rqstp);
3644         maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3645         /*
3646          * Note the rfc defines rd_maxcount as the size of the
3647          * READDIR4resok structure, which includes the verifier above
3648          * and the 8 bytes encoded at the end of this function:
3649          */
3650         if (maxcount < 16) {
3651                 nfserr = nfserr_toosmall;
3652                 goto err_no_verf;
3653         }
3654         maxcount = min_t(int, maxcount-16, bytes_left);
3655
3656         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3657         if (!readdir->rd_dircount)
3658                 readdir->rd_dircount = svc_max_payload(resp->rqstp);
3659
3660         readdir->xdr = xdr;
3661         readdir->rd_maxcount = maxcount;
3662         readdir->common.err = 0;
3663         readdir->cookie_offset = 0;
3664
3665         offset = readdir->rd_cookie;
3666         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3667                               &offset,
3668                               &readdir->common, nfsd4_encode_dirent);
3669         if (nfserr == nfs_ok &&
3670             readdir->common.err == nfserr_toosmall &&
3671             xdr->buf->len == starting_len + 8) {
3672                 /* nothing encoded; which limit did we hit?: */
3673                 if (maxcount - 16 < bytes_left)
3674                         /* It was the fault of rd_maxcount: */
3675                         nfserr = nfserr_toosmall;
3676                 else
3677                         /* We ran out of buffer space: */
3678                         nfserr = nfserr_resource;
3679         }
3680         if (nfserr)
3681                 goto err_no_verf;
3682
3683         if (readdir->cookie_offset) {
3684                 wire_offset = cpu_to_be64(offset);
3685                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3686                                                         &wire_offset, 8);
3687         }
3688
3689         p = xdr_reserve_space(xdr, 8);
3690         if (!p) {
3691                 WARN_ON_ONCE(1);
3692                 goto err_no_verf;
3693         }
3694         *p++ = 0;       /* no more entries */
3695         *p++ = htonl(readdir->common.err == nfserr_eof);
3696
3697         return 0;
3698 err_no_verf:
3699         xdr_truncate_encode(xdr, starting_len);
3700         return nfserr;
3701 }
3702
3703 static __be32
3704 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3705 {
3706         struct xdr_stream *xdr = &resp->xdr;
3707         __be32 *p;
3708
3709         if (!nfserr) {
3710                 p = xdr_reserve_space(xdr, 20);
3711                 if (!p)
3712                         return nfserr_resource;
3713                 p = encode_cinfo(p, &remove->rm_cinfo);
3714         }
3715         return nfserr;
3716 }
3717
3718 static __be32
3719 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3720 {
3721         struct xdr_stream *xdr = &resp->xdr;
3722         __be32 *p;
3723
3724         if (!nfserr) {
3725                 p = xdr_reserve_space(xdr, 40);
3726                 if (!p)
3727                         return nfserr_resource;
3728                 p = encode_cinfo(p, &rename->rn_sinfo);
3729                 p = encode_cinfo(p, &rename->rn_tinfo);
3730         }
3731         return nfserr;
3732 }
3733
3734 static __be32
3735 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3736                          __be32 nfserr, struct svc_export *exp)
3737 {
3738         u32 i, nflavs, supported;
3739         struct exp_flavor_info *flavs;
3740         struct exp_flavor_info def_flavs[2];
3741         __be32 *p, *flavorsp;
3742         static bool report = true;
3743
3744         if (nfserr)
3745                 goto out;
3746         nfserr = nfserr_resource;
3747         if (exp->ex_nflavors) {
3748                 flavs = exp->ex_flavors;
3749                 nflavs = exp->ex_nflavors;
3750         } else { /* Handling of some defaults in absence of real secinfo: */
3751                 flavs = def_flavs;
3752                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3753                         nflavs = 2;
3754                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3755                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3756                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3757                         nflavs = 1;
3758                         flavs[0].pseudoflavor
3759                                         = svcauth_gss_flavor(exp->ex_client);
3760                 } else {
3761                         nflavs = 1;
3762                         flavs[0].pseudoflavor
3763                                         = exp->ex_client->flavour->flavour;
3764                 }
3765         }
3766
3767         supported = 0;
3768         p = xdr_reserve_space(xdr, 4);
3769         if (!p)
3770                 goto out;
3771         flavorsp = p++;         /* to be backfilled later */
3772
3773         for (i = 0; i < nflavs; i++) {
3774                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3775                 struct rpcsec_gss_info info;
3776
3777                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3778                         supported++;
3779                         p = xdr_reserve_space(xdr, 4 + 4 +
3780                                               XDR_LEN(info.oid.len) + 4 + 4);
3781                         if (!p)
3782                                 goto out;
3783                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3784                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3785                         *p++ = cpu_to_be32(info.qop);
3786                         *p++ = cpu_to_be32(info.service);
3787                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3788                         supported++;
3789                         p = xdr_reserve_space(xdr, 4);
3790                         if (!p)
3791                                 goto out;
3792                         *p++ = cpu_to_be32(pf);
3793                 } else {
3794                         if (report)
3795                                 pr_warn("NFS: SECINFO: security flavor %u "
3796                                         "is not supported\n", pf);
3797                 }
3798         }
3799
3800         if (nflavs != supported)
3801                 report = false;
3802         *flavorsp = htonl(supported);
3803         nfserr = 0;
3804 out:
3805         if (exp)
3806                 exp_put(exp);
3807         return nfserr;
3808 }
3809
3810 static __be32
3811 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3812                      struct nfsd4_secinfo *secinfo)
3813 {
3814         struct xdr_stream *xdr = &resp->xdr;
3815
3816         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3817 }
3818
3819 static __be32
3820 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3821                      struct nfsd4_secinfo_no_name *secinfo)
3822 {
3823         struct xdr_stream *xdr = &resp->xdr;
3824
3825         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3826 }
3827
3828 /*
3829  * The SETATTR encode routine is special -- it always encodes a bitmap,
3830  * regardless of the error status.
3831  */
3832 static __be32
3833 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3834 {
3835         struct xdr_stream *xdr = &resp->xdr;
3836         __be32 *p;
3837
3838         p = xdr_reserve_space(xdr, 16);
3839         if (!p)
3840                 return nfserr_resource;
3841         if (nfserr) {
3842                 *p++ = cpu_to_be32(3);
3843                 *p++ = cpu_to_be32(0);
3844                 *p++ = cpu_to_be32(0);
3845                 *p++ = cpu_to_be32(0);
3846         }
3847         else {
3848                 *p++ = cpu_to_be32(3);
3849                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3850                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3851                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3852         }
3853         return nfserr;
3854 }
3855
3856 static __be32
3857 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3858 {
3859         struct xdr_stream *xdr = &resp->xdr;
3860         __be32 *p;
3861
3862         if (!nfserr) {
3863                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3864                 if (!p)
3865                         return nfserr_resource;
3866                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3867                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3868                                                 NFS4_VERIFIER_SIZE);
3869         }
3870         else if (nfserr == nfserr_clid_inuse) {
3871                 p = xdr_reserve_space(xdr, 8);
3872                 if (!p)
3873                         return nfserr_resource;
3874                 *p++ = cpu_to_be32(0);
3875                 *p++ = cpu_to_be32(0);
3876         }
3877         return nfserr;
3878 }
3879
3880 static __be32
3881 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3882 {
3883         struct xdr_stream *xdr = &resp->xdr;
3884         __be32 *p;
3885
3886         if (!nfserr) {
3887                 p = xdr_reserve_space(xdr, 16);
3888                 if (!p)
3889                         return nfserr_resource;
3890                 *p++ = cpu_to_be32(write->wr_bytes_written);
3891                 *p++ = cpu_to_be32(write->wr_how_written);
3892                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3893                                                         NFS4_VERIFIER_SIZE);
3894         }
3895         return nfserr;
3896 }
3897
3898 static __be32
3899 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3900                          struct nfsd4_exchange_id *exid)
3901 {
3902         struct xdr_stream *xdr = &resp->xdr;
3903         __be32 *p;
3904         char *major_id;
3905         char *server_scope;
3906         int major_id_sz;
3907         int server_scope_sz;
3908         int status = 0;
3909         uint64_t minor_id = 0;
3910
3911         if (nfserr)
3912                 return nfserr;
3913
3914         major_id = utsname()->nodename;
3915         major_id_sz = strlen(major_id);
3916         server_scope = utsname()->nodename;
3917         server_scope_sz = strlen(server_scope);
3918
3919         p = xdr_reserve_space(xdr,
3920                 8 /* eir_clientid */ +
3921                 4 /* eir_sequenceid */ +
3922                 4 /* eir_flags */ +
3923                 4 /* spr_how */);
3924         if (!p)
3925                 return nfserr_resource;
3926
3927         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3928         *p++ = cpu_to_be32(exid->seqid);
3929         *p++ = cpu_to_be32(exid->flags);
3930
3931         *p++ = cpu_to_be32(exid->spa_how);
3932
3933         switch (exid->spa_how) {
3934         case SP4_NONE:
3935                 break;
3936         case SP4_MACH_CRED:
3937                 /* spo_must_enforce bitmap: */
3938                 status = nfsd4_encode_bitmap(xdr,
3939                                         exid->spo_must_enforce[0],
3940                                         exid->spo_must_enforce[1],
3941                                         exid->spo_must_enforce[2]);
3942                 if (status)
3943                         goto out;
3944                 /* spo_must_allow bitmap: */
3945                 status = nfsd4_encode_bitmap(xdr,
3946                                         exid->spo_must_allow[0],
3947                                         exid->spo_must_allow[1],
3948                                         exid->spo_must_allow[2]);
3949                 if (status)
3950                         goto out;
3951                 break;
3952         default:
3953                 WARN_ON_ONCE(1);
3954         }
3955
3956         p = xdr_reserve_space(xdr,
3957                 8 /* so_minor_id */ +
3958                 4 /* so_major_id.len */ +
3959                 (XDR_QUADLEN(major_id_sz) * 4) +
3960                 4 /* eir_server_scope.len */ +
3961                 (XDR_QUADLEN(server_scope_sz) * 4) +
3962                 4 /* eir_server_impl_id.count (0) */);
3963         if (!p)
3964                 return nfserr_resource;
3965
3966         /* The server_owner struct */
3967         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3968         /* major id */
3969         p = xdr_encode_opaque(p, major_id, major_id_sz);
3970
3971         /* Server scope */
3972         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3973
3974         /* Implementation id */
3975         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3976         return 0;
3977 out:
3978         return status;
3979 }
3980
3981 static __be32
3982 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3983                             struct nfsd4_create_session *sess)
3984 {
3985         struct xdr_stream *xdr = &resp->xdr;
3986         __be32 *p;
3987
3988         if (nfserr)
3989                 return nfserr;
3990
3991         p = xdr_reserve_space(xdr, 24);
3992         if (!p)
3993                 return nfserr_resource;
3994         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3995                                         NFS4_MAX_SESSIONID_LEN);
3996         *p++ = cpu_to_be32(sess->seqid);
3997         *p++ = cpu_to_be32(sess->flags);
3998
3999         p = xdr_reserve_space(xdr, 28);
4000         if (!p)
4001                 return nfserr_resource;
4002         *p++ = cpu_to_be32(0); /* headerpadsz */
4003         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4004         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4005         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4006         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4007         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4008         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4009
4010         if (sess->fore_channel.nr_rdma_attrs) {
4011                 p = xdr_reserve_space(xdr, 4);
4012                 if (!p)
4013                         return nfserr_resource;
4014                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4015         }
4016
4017         p = xdr_reserve_space(xdr, 28);
4018         if (!p)
4019                 return nfserr_resource;
4020         *p++ = cpu_to_be32(0); /* headerpadsz */
4021         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4022         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4023         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4024         *p++ = cpu_to_be32(sess->back_channel.maxops);
4025         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4026         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4027
4028         if (sess->back_channel.nr_rdma_attrs) {
4029                 p = xdr_reserve_space(xdr, 4);
4030                 if (!p)
4031                         return nfserr_resource;
4032                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4033         }
4034         return 0;
4035 }
4036
4037 static __be32
4038 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4039                       struct nfsd4_sequence *seq)
4040 {
4041         struct xdr_stream *xdr = &resp->xdr;
4042         __be32 *p;
4043
4044         if (nfserr)
4045                 return nfserr;
4046
4047         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4048         if (!p)
4049                 return nfserr_resource;
4050         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4051                                         NFS4_MAX_SESSIONID_LEN);
4052         *p++ = cpu_to_be32(seq->seqid);
4053         *p++ = cpu_to_be32(seq->slotid);
4054         /* Note slotid's are numbered from zero: */
4055         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4056         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4057         *p++ = cpu_to_be32(seq->status_flags);
4058
4059         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4060         return 0;
4061 }
4062
4063 static __be32
4064 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4065                           struct nfsd4_test_stateid *test_stateid)
4066 {
4067         struct xdr_stream *xdr = &resp->xdr;
4068         struct nfsd4_test_stateid_id *stateid, *next;
4069         __be32 *p;
4070
4071         if (nfserr)
4072                 return nfserr;
4073
4074         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4075         if (!p)
4076                 return nfserr_resource;
4077         *p++ = htonl(test_stateid->ts_num_ids);
4078
4079         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4080                 *p++ = stateid->ts_id_status;
4081         }
4082
4083         return nfserr;
4084 }
4085
4086 #ifdef CONFIG_NFSD_PNFS
4087 static __be32
4088 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4089                 struct nfsd4_getdeviceinfo *gdev)
4090 {
4091         struct xdr_stream *xdr = &resp->xdr;
4092         const struct nfsd4_layout_ops *ops;
4093         u32 starting_len = xdr->buf->len, needed_len;
4094         __be32 *p;
4095
4096         dprintk("%s: err %d\n", __func__, be32_to_cpu(nfserr));
4097         if (nfserr)
4098                 goto out;
4099
4100         nfserr = nfserr_resource;
4101         p = xdr_reserve_space(xdr, 4);
4102         if (!p)
4103                 goto out;
4104
4105         *p++ = cpu_to_be32(gdev->gd_layout_type);
4106
4107         /* If maxcount is 0 then just update notifications */
4108         if (gdev->gd_maxcount != 0) {
4109                 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4110                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4111                 if (nfserr) {
4112                         /*
4113                          * We don't bother to burden the layout drivers with
4114                          * enforcing gd_maxcount, just tell the client to
4115                          * come back with a bigger buffer if it's not enough.
4116                          */
4117                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4118                                 goto toosmall;
4119                         goto out;
4120                 }
4121         }
4122
4123         nfserr = nfserr_resource;
4124         if (gdev->gd_notify_types) {
4125                 p = xdr_reserve_space(xdr, 4 + 4);
4126                 if (!p)
4127                         goto out;
4128                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4129                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4130         } else {
4131                 p = xdr_reserve_space(xdr, 4);
4132                 if (!p)
4133                         goto out;
4134                 *p++ = 0;
4135         }
4136
4137         nfserr = 0;
4138 out:
4139         kfree(gdev->gd_device);
4140         dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4141         return nfserr;
4142
4143 toosmall:
4144         dprintk("%s: maxcount too small\n", __func__);
4145         needed_len = xdr->buf->len + 4 /* notifications */;
4146         xdr_truncate_encode(xdr, starting_len);
4147         p = xdr_reserve_space(xdr, 4);
4148         if (!p) {
4149                 nfserr = nfserr_resource;
4150         } else {
4151                 *p++ = cpu_to_be32(needed_len);
4152                 nfserr = nfserr_toosmall;
4153         }
4154         goto out;
4155 }
4156
4157 static __be32
4158 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4159                 struct nfsd4_layoutget *lgp)
4160 {
4161         struct xdr_stream *xdr = &resp->xdr;
4162         const struct nfsd4_layout_ops *ops;
4163         __be32 *p;
4164
4165         dprintk("%s: err %d\n", __func__, nfserr);
4166         if (nfserr)
4167                 goto out;
4168
4169         nfserr = nfserr_resource;
4170         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4171         if (!p)
4172                 goto out;
4173
4174         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4175         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4176         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4177                                     sizeof(stateid_opaque_t));
4178
4179         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4180         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4181         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4182         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4183         *p++ = cpu_to_be32(lgp->lg_layout_type);
4184
4185         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4186         nfserr = ops->encode_layoutget(xdr, lgp);
4187 out:
4188         kfree(lgp->lg_content);
4189         return nfserr;
4190 }
4191
4192 static __be32
4193 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4194                           struct nfsd4_layoutcommit *lcp)
4195 {
4196         struct xdr_stream *xdr = &resp->xdr;
4197         __be32 *p;
4198
4199         if (nfserr)
4200                 return nfserr;
4201
4202         p = xdr_reserve_space(xdr, 4);
4203         if (!p)
4204                 return nfserr_resource;
4205         *p++ = cpu_to_be32(lcp->lc_size_chg);
4206         if (lcp->lc_size_chg) {
4207                 p = xdr_reserve_space(xdr, 8);
4208                 if (!p)
4209                         return nfserr_resource;
4210                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4211         }
4212
4213         return nfs_ok;
4214 }
4215
4216 static __be32
4217 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4218                 struct nfsd4_layoutreturn *lrp)
4219 {
4220         struct xdr_stream *xdr = &resp->xdr;
4221         __be32 *p;
4222
4223         if (nfserr)
4224                 return nfserr;
4225
4226         p = xdr_reserve_space(xdr, 4);
4227         if (!p)
4228                 return nfserr_resource;
4229         *p++ = cpu_to_be32(lrp->lrs_present);
4230         if (lrp->lrs_present)
4231                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4232         return nfs_ok;
4233 }
4234 #endif /* CONFIG_NFSD_PNFS */
4235
4236 static __be32
4237 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4238 {
4239         __be32 *p;
4240
4241         p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4242         if (!p)
4243                 return nfserr_resource;
4244
4245         *p++ = cpu_to_be32(0);
4246         p = xdr_encode_hyper(p, write->wr_bytes_written);
4247         *p++ = cpu_to_be32(write->wr_stable_how);
4248         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4249                                     NFS4_VERIFIER_SIZE);
4250         return nfs_ok;
4251 }
4252
4253 static __be32
4254 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4255                   struct nfsd4_copy *copy)
4256 {
4257         __be32 *p;
4258
4259         if (!nfserr) {
4260                 nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
4261                 if (nfserr)
4262                         return nfserr;
4263
4264                 p = xdr_reserve_space(&resp->xdr, 4 + 4);
4265                 *p++ = cpu_to_be32(copy->cp_consecutive);
4266                 *p++ = cpu_to_be32(copy->cp_synchronous);
4267         }
4268         return nfserr;
4269 }
4270
4271 static __be32
4272 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4273                   struct nfsd4_seek *seek)
4274 {
4275         __be32 *p;
4276
4277         if (nfserr)
4278                 return nfserr;
4279
4280         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4281         *p++ = cpu_to_be32(seek->seek_eof);
4282         p = xdr_encode_hyper(p, seek->seek_pos);
4283
4284         return nfserr;
4285 }
4286
4287 static __be32
4288 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4289 {
4290         return nfserr;
4291 }
4292
4293 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4294
4295 /*
4296  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4297  * since we don't need to filter out obsolete ops as this is
4298  * done in the decoding phase.
4299  */
4300 static nfsd4_enc nfsd4_enc_ops[] = {
4301         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4302         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4303         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4304         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4305         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4306         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4307         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4308         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4309         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4310         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4311         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4312         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4313         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4314         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4315         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4316         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4317         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4318         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4319         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4320         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4321         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4322         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4323         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4324         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4325         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4326         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4327         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4328         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4329         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4330         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4331         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4332         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4333         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4334         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4335         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4336         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4337         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4338
4339         /* NFSv4.1 operations */
4340         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4341         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4342         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4343         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4344         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4345         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4346         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4347 #ifdef CONFIG_NFSD_PNFS
4348         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4349         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4350         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4351         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4352         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4353 #else
4354         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4355         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4356         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4357         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4358         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4359 #endif
4360         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4361         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4362         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4363         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4364         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4365         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4366         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4367
4368         /* NFSv4.2 operations */
4369         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4370         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
4371         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4372         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4373         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4374         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4375         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4376         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4377         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4378         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4379         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4380         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4381         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4382 };
4383
4384 /*
4385  * Calculate whether we still have space to encode repsize bytes.
4386  * There are two considerations:
4387  *     - For NFS versions >=4.1, the size of the reply must stay within
4388  *       session limits
4389  *     - For all NFS versions, we must stay within limited preallocated
4390  *       buffer space.
4391  *
4392  * This is called before the operation is processed, so can only provide
4393  * an upper estimate.  For some nonidempotent operations (such as
4394  * getattr), it's not necessarily a problem if that estimate is wrong,
4395  * as we can fail it after processing without significant side effects.
4396  */
4397 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4398 {
4399         struct xdr_buf *buf = &resp->rqstp->rq_res;
4400         struct nfsd4_slot *slot = resp->cstate.slot;
4401
4402         if (buf->len + respsize <= buf->buflen)
4403                 return nfs_ok;
4404         if (!nfsd4_has_session(&resp->cstate))
4405                 return nfserr_resource;
4406         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4407                 WARN_ON_ONCE(1);
4408                 return nfserr_rep_too_big_to_cache;
4409         }
4410         return nfserr_rep_too_big;
4411 }
4412
4413 void
4414 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4415 {
4416         struct xdr_stream *xdr = &resp->xdr;
4417         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4418         struct svc_rqst *rqstp = resp->rqstp;
4419         int post_err_offset;
4420         nfsd4_enc encoder;
4421         __be32 *p;
4422
4423         p = xdr_reserve_space(xdr, 8);
4424         if (!p) {
4425                 WARN_ON_ONCE(1);
4426                 return;
4427         }
4428         *p++ = cpu_to_be32(op->opnum);
4429         post_err_offset = xdr->buf->len;
4430
4431         if (op->opnum == OP_ILLEGAL)
4432                 goto status;
4433         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4434                !nfsd4_enc_ops[op->opnum]);
4435         encoder = nfsd4_enc_ops[op->opnum];
4436         op->status = encoder(resp, op->status, &op->u);
4437         xdr_commit_encode(xdr);
4438
4439         /* nfsd4_check_resp_size guarantees enough room for error status */
4440         if (!op->status) {
4441                 int space_needed = 0;
4442                 if (!nfsd4_last_compound_op(rqstp))
4443                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4444                 op->status = nfsd4_check_resp_size(resp, space_needed);
4445         }
4446         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4447                 struct nfsd4_slot *slot = resp->cstate.slot;
4448
4449                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4450                         op->status = nfserr_rep_too_big_to_cache;
4451                 else
4452                         op->status = nfserr_rep_too_big;
4453         }
4454         if (op->status == nfserr_resource ||
4455             op->status == nfserr_rep_too_big ||
4456             op->status == nfserr_rep_too_big_to_cache) {
4457                 /*
4458                  * The operation may have already been encoded or
4459                  * partially encoded.  No op returns anything additional
4460                  * in the case of one of these three errors, so we can
4461                  * just truncate back to after the status.  But it's a
4462                  * bug if we had to do this on a non-idempotent op:
4463                  */
4464                 warn_on_nonidempotent_op(op);
4465                 xdr_truncate_encode(xdr, post_err_offset);
4466         }
4467         if (so) {
4468                 int len = xdr->buf->len - post_err_offset;
4469
4470                 so->so_replay.rp_status = op->status;
4471                 so->so_replay.rp_buflen = len;
4472                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4473                                                 so->so_replay.rp_buf, len);
4474         }
4475 status:
4476         /* Note that op->status is already in network byte order: */
4477         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4478 }
4479
4480 /*
4481  * Encode the reply stored in the stateowner reply cache
4482  *
4483  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4484  * previously sent already encoded operation.
4485  */
4486 void
4487 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4488 {
4489         __be32 *p;
4490         struct nfs4_replay *rp = op->replay;
4491
4492         BUG_ON(!rp);
4493
4494         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4495         if (!p) {
4496                 WARN_ON_ONCE(1);
4497                 return;
4498         }
4499         *p++ = cpu_to_be32(op->opnum);
4500         *p++ = rp->rp_status;  /* already xdr'ed */
4501
4502         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4503 }
4504
4505 int
4506 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4507 {
4508         return xdr_ressize_check(rqstp, p);
4509 }
4510
4511 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4512 {
4513         struct svc_rqst *rqstp = rq;
4514         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4515
4516         if (args->ops != args->iops) {
4517                 kfree(args->ops);
4518                 args->ops = args->iops;
4519         }
4520         kfree(args->tmpp);
4521         args->tmpp = NULL;
4522         while (args->to_free) {
4523                 struct svcxdr_tmpbuf *tb = args->to_free;
4524                 args->to_free = tb->next;
4525                 kfree(tb);
4526         }
4527         return 1;
4528 }
4529
4530 int
4531 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4532 {
4533         if (rqstp->rq_arg.head[0].iov_len % 4) {
4534                 /* client is nuts */
4535                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4536                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4537                 return 0;
4538         }
4539         args->p = p;
4540         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4541         args->pagelist = rqstp->rq_arg.pages;
4542         args->pagelen = rqstp->rq_arg.page_len;
4543         args->tmpp = NULL;
4544         args->to_free = NULL;
4545         args->ops = args->iops;
4546         args->rqstp = rqstp;
4547
4548         return !nfsd4_decode_compound(args);
4549 }
4550
4551 int
4552 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4553 {
4554         /*
4555          * All that remains is to write the tag and operation count...
4556          */
4557         struct xdr_buf *buf = resp->xdr.buf;
4558
4559         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4560                                  buf->tail[0].iov_len);
4561
4562         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4563
4564         p = resp->tagp;
4565         *p++ = htonl(resp->taglen);
4566         memcpy(p, resp->tag, resp->taglen);
4567         p += XDR_QUADLEN(resp->taglen);
4568         *p++ = htonl(resp->opcnt);
4569
4570         nfsd4_sequence_done(resp);
4571         return 1;
4572 }
4573
4574 /*
4575  * Local variables:
4576  *  c-basic-offset: 8
4577  * End:
4578  */