kernel/fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 #include <linux/file.h>
  37 #include <linux/slab.h>
  38 #include <linux/namei.h>
  39 #include <linux/statfs.h>
  40 #include <linux/utsname.h>
  41 #include <linux/pagemap.h>
  42 #include <linux/sunrpc/svcauth_gss.h>
  43
  44 #include "idmap.h"
  45 #include "acl.h"
  46 #include "xdr4.h"
  47 #include "vfs.h"
  48 #include "state.h"
  49 #include "cache.h"
  50 #include "netns.h"
  51 #include "pnfs.h"
  52
  53 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  54 #include <linux/security.h>
  55 #endif
  56
  57
  58 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  59
  60 /*
  61  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  62  * directory in order to indicate to the client that a filesystem boundary is present
  63  * We use a fixed fsid for a referral
  64  */
  65 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  66 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  67
  68 static __be32
  69 check_filename(char *str, int len)
  70 {
  71         int i;
  72
  73         if (len == 0)
  74                 return nfserr_inval;
  75         if (isdotent(str, len))
  76                 return nfserr_badname;
  77         for (i = 0; i < len; i++)
  78                 if (str[i] == '/')
  79                         return nfserr_badname;
  80         return 0;
  81 }
  82
  83 #define DECODE_HEAD                             \
  84         __be32 *p;                              \
  85         __be32 status
  86 #define DECODE_TAIL                             \
  87         status = 0;                             \
  88 out:                                            \
  89         return status;                          \
  90 xdr_error:                                      \
  91         dprintk("NFSD: xdr error (%s:%d)\n",    \
  92                         __FILE__, __LINE__);    \
  93         status = nfserr_bad_xdr;                \
  94         goto out
  95
  96 #define READMEM(x,nbytes) do {                  \
  97         x = (char *)p;                          \
  98         p += XDR_QUADLEN(nbytes);               \
  99 } while (0)
 100 #define SAVEMEM(x,nbytes) do {                  \
 101         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 102                 savemem(argp, p, nbytes) :      \
 103                 (char *)p)) {                   \
 104                 dprintk("NFSD: xdr error (%s:%d)\n", \
 105                                 __FILE__, __LINE__); \
 106                 goto xdr_error;                 \
 107                 }                               \
 108         p += XDR_QUADLEN(nbytes);               \
 109 } while (0)
 110 #define COPYMEM(x,nbytes) do {                  \
 111         memcpy((x), p, nbytes);                 \
 112         p += XDR_QUADLEN(nbytes);               \
 113 } while (0)
 114
 115 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 116 #define READ_BUF(nbytes)  do {                  \
 117         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 118                 p = argp->p;                    \
 119                 argp->p += XDR_QUADLEN(nbytes); \
 120         } else if (!(p = read_buf(argp, nbytes))) { \
 121                 dprintk("NFSD: xdr error (%s:%d)\n", \
 122                                 __FILE__, __LINE__); \
 123                 goto xdr_error;                 \
 124         }                                       \
 125 } while (0)
 126
 127 static void next_decode_page(struct nfsd4_compoundargs *argp)
 128 {
 129         argp->p = page_address(argp->pagelist[0]);
 130         argp->pagelist++;
 131         if (argp->pagelen < PAGE_SIZE) {
 132                 argp->end = argp->p + (argp->pagelen>>2);
 133                 argp->pagelen = 0;
 134         } else {
 135                 argp->end = argp->p + (PAGE_SIZE>>2);
 136                 argp->pagelen -= PAGE_SIZE;
 137         }
 138 }
 139
 140 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 141 {
 142         /* We want more bytes than seem to be available.
 143          * Maybe we need a new page, maybe we have just run out
 144          */
 145         unsigned int avail = (char *)argp->end - (char *)argp->p;
 146         __be32 *p;
 147         if (avail + argp->pagelen < nbytes)
 148                 return NULL;
 149         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 150                 return NULL;
 151         /* ok, we can do it with the current plus the next page */
 152         if (nbytes <= sizeof(argp->tmp))
 153                 p = argp->tmp;
 154         else {
 155                 kfree(argp->tmpp);
 156                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 157                 if (!p)
 158                         return NULL;
 159
 160         }
 161         /*
 162          * The following memcpy is safe because read_buf is always
 163          * called with nbytes > avail, and the two cases above both
 164          * guarantee p points to at least nbytes bytes.
 165          */
 166         memcpy(p, argp->p, avail);
 167         next_decode_page(argp);
 168         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 169         argp->p += XDR_QUADLEN(nbytes - avail);
 170         return p;
 171 }
 172
 173 static int zero_clientid(clientid_t *clid)
 174 {
 175         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 176 }
 177
 178 /**
 179  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 180  * @argp: NFSv4 compound argument structure
 181  * @p: pointer to be freed (with kfree())
 182  *
 183  * Marks @p to be freed when processing the compound operation
 184  * described in @argp finishes.
 185  */
 186 static void *
 187 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 188 {
 189         struct svcxdr_tmpbuf *tb;
 190
 191         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 192         if (!tb)
 193                 return NULL;
 194         tb->next = argp->to_free;
 195         argp->to_free = tb;
 196         return tb->buf;
 197 }
 198
 199 /*
 200  * For xdr strings that need to be passed to other kernel api's
 201  * as null-terminated strings.
 202  *
 203  * Note null-terminating in place usually isn't safe since the
 204  * buffer might end on a page boundary.
 205  */
 206 static char *
 207 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 208 {
 209         char *p = svcxdr_tmpalloc(argp, len + 1);
 210
 211         if (!p)
 212                 return NULL;
 213         memcpy(p, buf, len);
 214         p[len] = '\0';
 215         return p;
 216 }
 217
 218 /**
 219  * savemem - duplicate a chunk of memory for later processing
 220  * @argp: NFSv4 compound argument structure to be freed with
 221  * @p: pointer to be duplicated
 222  * @nbytes: length to be duplicated
 223  *
 224  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 225  * that are preserved until processing of the NFSv4 compound
 226  * operation described by @argp finishes.
 227  */
 228 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 229 {
 230         void *ret;
 231
 232         ret = svcxdr_tmpalloc(argp, nbytes);
 233         if (!ret)
 234                 return NULL;
 235         memcpy(ret, p, nbytes);
 236         return ret;
 237 }
 238
 239 /*
 240  * We require the high 32 bits of 'seconds' to be 0, and
 241  * we ignore all 32 bits of 'nseconds'.
 242  */
 243 static __be32
 244 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
 245 {
 246         DECODE_HEAD;
 247         u64 sec;
 248
 249         READ_BUF(12);
 250         p = xdr_decode_hyper(p, &sec);
 251         tv->tv_sec = sec;
 252         tv->tv_nsec = be32_to_cpup(p++);
 253         if (tv->tv_nsec >= (u32)1000000000)
 254                 return nfserr_inval;
 255
 256         DECODE_TAIL;
 257 }
 258
 259 static __be32
 260 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 261 {
 262         u32 bmlen;
 263         DECODE_HEAD;
 264
 265         bmval[0] = 0;
 266         bmval[1] = 0;
 267         bmval[2] = 0;
 268
 269         READ_BUF(4);
 270         bmlen = be32_to_cpup(p++);
 271         if (bmlen > 1000)
 272                 goto xdr_error;
 273
 274         READ_BUF(bmlen << 2);
 275         if (bmlen > 0)
 276                 bmval[0] = be32_to_cpup(p++);
 277         if (bmlen > 1)
 278                 bmval[1] = be32_to_cpup(p++);
 279         if (bmlen > 2)
 280                 bmval[2] = be32_to_cpup(p++);
 281
 282         DECODE_TAIL;
 283 }
 284
 285 static __be32
 286 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 287                    struct iattr *iattr, struct nfs4_acl **acl,
 288                    struct xdr_netobj *label)
 289 {
 290         int expected_len, len = 0;
 291         u32 dummy32;
 292         char *buf;
 293
 294         DECODE_HEAD;
 295         iattr->ia_valid = 0;
 296         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 297                 return status;
 298
 299         READ_BUF(4);
 300         expected_len = be32_to_cpup(p++);
 301
 302         if (bmval[0] & FATTR4_WORD0_SIZE) {
 303                 READ_BUF(8);
 304                 len += 8;
 305                 p = xdr_decode_hyper(p, &iattr->ia_size);
 306                 iattr->ia_valid |= ATTR_SIZE;
 307         }
 308         if (bmval[0] & FATTR4_WORD0_ACL) {
 309                 u32 nace;
 310                 struct nfs4_ace *ace;
 311
 312                 READ_BUF(4); len += 4;
 313                 nace = be32_to_cpup(p++);
 314
 315                 if (nace > NFS4_ACL_MAX)
 316                         return nfserr_fbig;
 317
 318                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
 319                 if (*acl == NULL)
 320                         return nfserr_jukebox;
 321
 322                 (*acl)->naces = nace;
 323                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 324                         READ_BUF(16); len += 16;
 325                         ace->type = be32_to_cpup(p++);
 326                         ace->flag = be32_to_cpup(p++);
 327                         ace->access_mask = be32_to_cpup(p++);
 328                         dummy32 = be32_to_cpup(p++);
 329                         READ_BUF(dummy32);
 330                         len += XDR_QUADLEN(dummy32) << 2;
 331                         READMEM(buf, dummy32);
 332                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 333                         status = nfs_ok;
 334                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 335                                 ;
 336                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 337                                 status = nfsd_map_name_to_gid(argp->rqstp,
 338                                                 buf, dummy32, &ace->who_gid);
 339                         else
 340                                 status = nfsd_map_name_to_uid(argp->rqstp,
 341                                                 buf, dummy32, &ace->who_uid);
 342                         if (status)
 343                                 return status;
 344                 }
 345         } else
 346                 *acl = NULL;
 347         if (bmval[1] & FATTR4_WORD1_MODE) {
 348                 READ_BUF(4);
 349                 len += 4;
 350                 iattr->ia_mode = be32_to_cpup(p++);
 351                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 352                 iattr->ia_valid |= ATTR_MODE;
 353         }
 354         if (bmval[1] & FATTR4_WORD1_OWNER) {
 355                 READ_BUF(4);
 356                 len += 4;
 357                 dummy32 = be32_to_cpup(p++);
 358                 READ_BUF(dummy32);
 359                 len += (XDR_QUADLEN(dummy32) << 2);
 360                 READMEM(buf, dummy32);
 361                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 362                         return status;
 363                 iattr->ia_valid |= ATTR_UID;
 364         }
 365         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 366                 READ_BUF(4);
 367                 len += 4;
 368                 dummy32 = be32_to_cpup(p++);
 369                 READ_BUF(dummy32);
 370                 len += (XDR_QUADLEN(dummy32) << 2);
 371                 READMEM(buf, dummy32);
 372                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 373                         return status;
 374                 iattr->ia_valid |= ATTR_GID;
 375         }
 376         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 377                 READ_BUF(4);
 378                 len += 4;
 379                 dummy32 = be32_to_cpup(p++);
 380                 switch (dummy32) {
 381                 case NFS4_SET_TO_CLIENT_TIME:
 382                         len += 12;
 383                         status = nfsd4_decode_time(argp, &iattr->ia_atime);
 384                         if (status)
 385                                 return status;
 386                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 387                         break;
 388                 case NFS4_SET_TO_SERVER_TIME:
 389                         iattr->ia_valid |= ATTR_ATIME;
 390                         break;
 391                 default:
 392                         goto xdr_error;
 393                 }
 394         }
 395         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 396                 READ_BUF(4);
 397                 len += 4;
 398                 dummy32 = be32_to_cpup(p++);
 399                 switch (dummy32) {
 400                 case NFS4_SET_TO_CLIENT_TIME:
 401                         len += 12;
 402                         status = nfsd4_decode_time(argp, &iattr->ia_mtime);
 403                         if (status)
 404                                 return status;
 405                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 406                         break;
 407                 case NFS4_SET_TO_SERVER_TIME:
 408                         iattr->ia_valid |= ATTR_MTIME;
 409                         break;
 410                 default:
 411                         goto xdr_error;
 412                 }
 413         }
 414
 415         label->len = 0;
 416 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 417         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 418                 READ_BUF(4);
 419                 len += 4;
 420                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 421                 READ_BUF(4);
 422                 len += 4;
 423                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 424                 READ_BUF(4);
 425                 len += 4;
 426                 dummy32 = be32_to_cpup(p++);
 427                 READ_BUF(dummy32);
 428                 if (dummy32 > NFS4_MAXLABELLEN)
 429                         return nfserr_badlabel;
 430                 len += (XDR_QUADLEN(dummy32) << 2);
 431                 READMEM(buf, dummy32);
 432                 label->len = dummy32;
 433                 label->data = svcxdr_dupstr(argp, buf, dummy32);
 434                 if (!label->data)
 435                         return nfserr_jukebox;
 436         }
 437 #endif
 438
 439         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 440             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 441             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 442                 READ_BUF(expected_len - len);
 443         else if (len != expected_len)
 444                 goto xdr_error;
 445
 446         DECODE_TAIL;
 447 }
 448
 449 static __be32
 450 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 451 {
 452         DECODE_HEAD;
 453
 454         READ_BUF(sizeof(stateid_t));
 455         sid->si_generation = be32_to_cpup(p++);
 456         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 457
 458         DECODE_TAIL;
 459 }
 460
 461 static __be32
 462 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 463 {
 464         DECODE_HEAD;
 465
 466         READ_BUF(4);
 467         access->ac_req_access = be32_to_cpup(p++);
 468
 469         DECODE_TAIL;
 470 }
 471
 472 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 473 {
 474         DECODE_HEAD;
 475         u32 dummy, uid, gid;
 476         char *machine_name;
 477         int i;
 478         int nr_secflavs;
 479
 480         /* callback_sec_params4 */
 481         READ_BUF(4);
 482         nr_secflavs = be32_to_cpup(p++);
 483         if (nr_secflavs)
 484                 cbs->flavor = (u32)(-1);
 485         else
 486                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 487                 cbs->flavor = 0;
 488         for (i = 0; i < nr_secflavs; ++i) {
 489                 READ_BUF(4);
 490                 dummy = be32_to_cpup(p++);
 491                 switch (dummy) {
 492                 case RPC_AUTH_NULL:
 493                         /* Nothing to read */
 494                         if (cbs->flavor == (u32)(-1))
 495                                 cbs->flavor = RPC_AUTH_NULL;
 496                         break;
 497                 case RPC_AUTH_UNIX:
 498                         READ_BUF(8);
 499                         /* stamp */
 500                         dummy = be32_to_cpup(p++);
 501
 502                         /* machine name */
 503                         dummy = be32_to_cpup(p++);
 504                         READ_BUF(dummy);
 505                         SAVEMEM(machine_name, dummy);
 506
 507                         /* uid, gid */
 508                         READ_BUF(8);
 509                         uid = be32_to_cpup(p++);
 510                         gid = be32_to_cpup(p++);
 511
 512                         /* more gids */
 513                         READ_BUF(4);
 514                         dummy = be32_to_cpup(p++);
 515                         READ_BUF(dummy * 4);
 516                         if (cbs->flavor == (u32)(-1)) {
 517                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 518                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 519                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 520                                         cbs->uid = kuid;
 521                                         cbs->gid = kgid;
 522                                         cbs->flavor = RPC_AUTH_UNIX;
 523                                 } else {
 524                                         dprintk("RPC_AUTH_UNIX with invalid"
 525                                                 "uid or gid ignoring!\n");
 526                                 }
 527                         }
 528                         break;
 529                 case RPC_AUTH_GSS:
 530                         dprintk("RPC_AUTH_GSS callback secflavor "
 531                                 "not supported!\n");
 532                         READ_BUF(8);
 533                         /* gcbp_service */
 534                         dummy = be32_to_cpup(p++);
 535                         /* gcbp_handle_from_server */
 536                         dummy = be32_to_cpup(p++);
 537                         READ_BUF(dummy);
 538                         p += XDR_QUADLEN(dummy);
 539                         /* gcbp_handle_from_client */
 540                         READ_BUF(4);
 541                         dummy = be32_to_cpup(p++);
 542                         READ_BUF(dummy);
 543                         break;
 544                 default:
 545                         dprintk("Illegal callback secflavor\n");
 546                         return nfserr_inval;
 547                 }
 548         }
 549         DECODE_TAIL;
 550 }
 551
 552 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 553 {
 554         DECODE_HEAD;
 555
 556         READ_BUF(4);
 557         bc->bc_cb_program = be32_to_cpup(p++);
 558         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 559
 560         DECODE_TAIL;
 561 }
 562
 563 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 564 {
 565         DECODE_HEAD;
 566
 567         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 568         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 569         bcts->dir = be32_to_cpup(p++);
 570         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 571          * could help us figure out we should be using it. */
 572         DECODE_TAIL;
 573 }
 574
 575 static __be32
 576 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 577 {
 578         DECODE_HEAD;
 579
 580         READ_BUF(4);
 581         close->cl_seqid = be32_to_cpup(p++);
 582         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 583
 584         DECODE_TAIL;
 585 }
 586
 587
 588 static __be32
 589 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 590 {
 591         DECODE_HEAD;
 592
 593         READ_BUF(12);
 594         p = xdr_decode_hyper(p, &commit->co_offset);
 595         commit->co_count = be32_to_cpup(p++);
 596
 597         DECODE_TAIL;
 598 }
 599
 600 static __be32
 601 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 602 {
 603         DECODE_HEAD;
 604
 605         READ_BUF(4);
 606         create->cr_type = be32_to_cpup(p++);
 607         switch (create->cr_type) {
 608         case NF4LNK:
 609                 READ_BUF(4);
 610                 create->cr_datalen = be32_to_cpup(p++);
 611                 READ_BUF(create->cr_datalen);
 612                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 613                 if (!create->cr_data)
 614                         return nfserr_jukebox;
 615                 break;
 616         case NF4BLK:
 617         case NF4CHR:
 618                 READ_BUF(8);
 619                 create->cr_specdata1 = be32_to_cpup(p++);
 620                 create->cr_specdata2 = be32_to_cpup(p++);
 621                 break;
 622         case NF4SOCK:
 623         case NF4FIFO:
 624         case NF4DIR:
 625         default:
 626                 break;
 627         }
 628
 629         READ_BUF(4);
 630         create->cr_namelen = be32_to_cpup(p++);
 631         READ_BUF(create->cr_namelen);
 632         SAVEMEM(create->cr_name, create->cr_namelen);
 633         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 634                 return status;
 635
 636         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 637                                     &create->cr_acl, &create->cr_label);
 638         if (status)
 639                 goto out;
 640
 641         DECODE_TAIL;
 642 }
 643
 644 static inline __be32
 645 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 646 {
 647         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 648 }
 649
 650 static inline __be32
 651 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 652 {
 653         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 654 }
 655
 656 static __be32
 657 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 658 {
 659         DECODE_HEAD;
 660
 661         READ_BUF(4);
 662         link->li_namelen = be32_to_cpup(p++);
 663         READ_BUF(link->li_namelen);
 664         SAVEMEM(link->li_name, link->li_namelen);
 665         if ((status = check_filename(link->li_name, link->li_namelen)))
 666                 return status;
 667
 668         DECODE_TAIL;
 669 }
 670
 671 static __be32
 672 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 673 {
 674         DECODE_HEAD;
 675
 676         /*
 677         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 678         */
 679         READ_BUF(28);
 680         lock->lk_type = be32_to_cpup(p++);
 681         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 682                 goto xdr_error;
 683         lock->lk_reclaim = be32_to_cpup(p++);
 684         p = xdr_decode_hyper(p, &lock->lk_offset);
 685         p = xdr_decode_hyper(p, &lock->lk_length);
 686         lock->lk_is_new = be32_to_cpup(p++);
 687
 688         if (lock->lk_is_new) {
 689                 READ_BUF(4);
 690                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 691                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 692                 if (status)
 693                         return status;
 694                 READ_BUF(8 + sizeof(clientid_t));
 695                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 696                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 697                 lock->lk_new_owner.len = be32_to_cpup(p++);
 698                 READ_BUF(lock->lk_new_owner.len);
 699                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 700         } else {
 701                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 702                 if (status)
 703                         return status;
 704                 READ_BUF(4);
 705                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 706         }
 707
 708         DECODE_TAIL;
 709 }
 710
 711 static __be32
 712 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 713 {
 714         DECODE_HEAD;
 715
 716         READ_BUF(32);
 717         lockt->lt_type = be32_to_cpup(p++);
 718         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 719                 goto xdr_error;
 720         p = xdr_decode_hyper(p, &lockt->lt_offset);
 721         p = xdr_decode_hyper(p, &lockt->lt_length);
 722         COPYMEM(&lockt->lt_clientid, 8);
 723         lockt->lt_owner.len = be32_to_cpup(p++);
 724         READ_BUF(lockt->lt_owner.len);
 725         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 726
 727         DECODE_TAIL;
 728 }
 729
 730 static __be32
 731 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 732 {
 733         DECODE_HEAD;
 734
 735         READ_BUF(8);
 736         locku->lu_type = be32_to_cpup(p++);
 737         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 738                 goto xdr_error;
 739         locku->lu_seqid = be32_to_cpup(p++);
 740         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 741         if (status)
 742                 return status;
 743         READ_BUF(16);
 744         p = xdr_decode_hyper(p, &locku->lu_offset);
 745         p = xdr_decode_hyper(p, &locku->lu_length);
 746
 747         DECODE_TAIL;
 748 }
 749
 750 static __be32
 751 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 752 {
 753         DECODE_HEAD;
 754
 755         READ_BUF(4);
 756         lookup->lo_len = be32_to_cpup(p++);
 757         READ_BUF(lookup->lo_len);
 758         SAVEMEM(lookup->lo_name, lookup->lo_len);
 759         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 760                 return status;
 761
 762         DECODE_TAIL;
 763 }
 764
 765 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 766 {
 767         __be32 *p;
 768         u32 w;
 769
 770         READ_BUF(4);
 771         w = be32_to_cpup(p++);
 772         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 773         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 774         if (deleg_when)
 775                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 776
 777         switch (w & NFS4_SHARE_ACCESS_MASK) {
 778         case NFS4_SHARE_ACCESS_READ:
 779         case NFS4_SHARE_ACCESS_WRITE:
 780         case NFS4_SHARE_ACCESS_BOTH:
 781                 break;
 782         default:
 783                 return nfserr_bad_xdr;
 784         }
 785         w &= ~NFS4_SHARE_ACCESS_MASK;
 786         if (!w)
 787                 return nfs_ok;
 788         if (!argp->minorversion)
 789                 return nfserr_bad_xdr;
 790         switch (w & NFS4_SHARE_WANT_MASK) {
 791         case NFS4_SHARE_WANT_NO_PREFERENCE:
 792         case NFS4_SHARE_WANT_READ_DELEG:
 793         case NFS4_SHARE_WANT_WRITE_DELEG:
 794         case NFS4_SHARE_WANT_ANY_DELEG:
 795         case NFS4_SHARE_WANT_NO_DELEG:
 796         case NFS4_SHARE_WANT_CANCEL:
 797                 break;
 798         default:
 799                 return nfserr_bad_xdr;
 800         }
 801         w &= ~NFS4_SHARE_WANT_MASK;
 802         if (!w)
 803                 return nfs_ok;
 804
 805         if (!deleg_when)        /* open_downgrade */
 806                 return nfserr_inval;
 807         switch (w) {
 808         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 809         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 810         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 811               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 812                 return nfs_ok;
 813         }
 814 xdr_error:
 815         return nfserr_bad_xdr;
 816 }
 817
 818 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 819 {
 820         __be32 *p;
 821
 822         READ_BUF(4);
 823         *x = be32_to_cpup(p++);
 824         /* Note: unlinke access bits, deny bits may be zero. */
 825         if (*x & ~NFS4_SHARE_DENY_BOTH)
 826                 return nfserr_bad_xdr;
 827         return nfs_ok;
 828 xdr_error:
 829         return nfserr_bad_xdr;
 830 }
 831
 832 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 833 {
 834         __be32 *p;
 835
 836         READ_BUF(4);
 837         o->len = be32_to_cpup(p++);
 838
 839         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 840                 return nfserr_bad_xdr;
 841
 842         READ_BUF(o->len);
 843         SAVEMEM(o->data, o->len);
 844         return nfs_ok;
 845 xdr_error:
 846         return nfserr_bad_xdr;
 847 }
 848
 849 static __be32
 850 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 851 {
 852         DECODE_HEAD;
 853         u32 dummy;
 854
 855         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 856         open->op_iattr.ia_valid = 0;
 857         open->op_openowner = NULL;
 858
 859         open->op_xdr_error = 0;
 860         /* seqid, share_access, share_deny, clientid, ownerlen */
 861         READ_BUF(4);
 862         open->op_seqid = be32_to_cpup(p++);
 863         /* decode, yet ignore deleg_when until supported */
 864         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 865                                            &open->op_deleg_want, &dummy);
 866         if (status)
 867                 goto xdr_error;
 868         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 869         if (status)
 870                 goto xdr_error;
 871         READ_BUF(sizeof(clientid_t));
 872         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 873         status = nfsd4_decode_opaque(argp, &open->op_owner);
 874         if (status)
 875                 goto xdr_error;
 876         READ_BUF(4);
 877         open->op_create = be32_to_cpup(p++);
 878         switch (open->op_create) {
 879         case NFS4_OPEN_NOCREATE:
 880                 break;
 881         case NFS4_OPEN_CREATE:
 882                 READ_BUF(4);
 883                 open->op_createmode = be32_to_cpup(p++);
 884                 switch (open->op_createmode) {
 885                 case NFS4_CREATE_UNCHECKED:
 886                 case NFS4_CREATE_GUARDED:
 887                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 888                                 &open->op_iattr, &open->op_acl, &open->op_label);
 889                         if (status)
 890                                 goto out;
 891                         break;
 892                 case NFS4_CREATE_EXCLUSIVE:
 893                         READ_BUF(NFS4_VERIFIER_SIZE);
 894                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 895                         break;
 896                 case NFS4_CREATE_EXCLUSIVE4_1:
 897                         if (argp->minorversion < 1)
 898                                 goto xdr_error;
 899                         READ_BUF(NFS4_VERIFIER_SIZE);
 900                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 901                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 902                                 &open->op_iattr, &open->op_acl, &open->op_label);
 903                         if (status)
 904                                 goto out;
 905                         break;
 906                 default:
 907                         goto xdr_error;
 908                 }
 909                 break;
 910         default:
 911                 goto xdr_error;
 912         }
 913
 914         /* open_claim */
 915         READ_BUF(4);
 916         open->op_claim_type = be32_to_cpup(p++);
 917         switch (open->op_claim_type) {
 918         case NFS4_OPEN_CLAIM_NULL:
 919         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 920                 READ_BUF(4);
 921                 open->op_fname.len = be32_to_cpup(p++);
 922                 READ_BUF(open->op_fname.len);
 923                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 924                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 925                         return status;
 926                 break;
 927         case NFS4_OPEN_CLAIM_PREVIOUS:
 928                 READ_BUF(4);
 929                 open->op_delegate_type = be32_to_cpup(p++);
 930                 break;
 931         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 932                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 933                 if (status)
 934                         return status;
 935                 READ_BUF(4);
 936                 open->op_fname.len = be32_to_cpup(p++);
 937                 READ_BUF(open->op_fname.len);
 938                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 939                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 940                         return status;
 941                 break;
 942         case NFS4_OPEN_CLAIM_FH:
 943         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 944                 if (argp->minorversion < 1)
 945                         goto xdr_error;
 946                 /* void */
 947                 break;
 948         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 949                 if (argp->minorversion < 1)
 950                         goto xdr_error;
 951                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 952                 if (status)
 953                         return status;
 954                 break;
 955         default:
 956                 goto xdr_error;
 957         }
 958
 959         DECODE_TAIL;
 960 }
 961
 962 static __be32
 963 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 964 {
 965         DECODE_HEAD;
 966
 967         if (argp->minorversion >= 1)
 968                 return nfserr_notsupp;
 969
 970         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 971         if (status)
 972                 return status;
 973         READ_BUF(4);
 974         open_conf->oc_seqid = be32_to_cpup(p++);
 975
 976         DECODE_TAIL;
 977 }
 978
 979 static __be32
 980 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 981 {
 982         DECODE_HEAD;
 983
 984         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 985         if (status)
 986                 return status;
 987         READ_BUF(4);
 988         open_down->od_seqid = be32_to_cpup(p++);
 989         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 990                                            &open_down->od_deleg_want, NULL);
 991         if (status)
 992                 return status;
 993         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 994         if (status)
 995                 return status;
 996         DECODE_TAIL;
 997 }
 998
 999 static __be32
1000 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1001 {
1002         DECODE_HEAD;
1003
1004         READ_BUF(4);
1005         putfh->pf_fhlen = be32_to_cpup(p++);
1006         if (putfh->pf_fhlen > NFS4_FHSIZE)
1007                 goto xdr_error;
1008         READ_BUF(putfh->pf_fhlen);
1009         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1010
1011         DECODE_TAIL;
1012 }
1013
1014 static __be32
1015 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1016 {
1017         if (argp->minorversion == 0)
1018                 return nfs_ok;
1019         return nfserr_notsupp;
1020 }
1021
1022 static __be32
1023 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1024 {
1025         DECODE_HEAD;
1026
1027         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1028         if (status)
1029                 return status;
1030         READ_BUF(12);
1031         p = xdr_decode_hyper(p, &read->rd_offset);
1032         read->rd_length = be32_to_cpup(p++);
1033
1034         DECODE_TAIL;
1035 }
1036
1037 static __be32
1038 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1039 {
1040         DECODE_HEAD;
1041
1042         READ_BUF(24);
1043         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1044         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1045         readdir->rd_dircount = be32_to_cpup(p++);
1046         readdir->rd_maxcount = be32_to_cpup(p++);
1047         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1048                 goto out;
1049
1050         DECODE_TAIL;
1051 }
1052
1053 static __be32
1054 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1055 {
1056         DECODE_HEAD;
1057
1058         READ_BUF(4);
1059         remove->rm_namelen = be32_to_cpup(p++);
1060         READ_BUF(remove->rm_namelen);
1061         SAVEMEM(remove->rm_name, remove->rm_namelen);
1062         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1063                 return status;
1064
1065         DECODE_TAIL;
1066 }
1067
1068 static __be32
1069 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1070 {
1071         DECODE_HEAD;
1072
1073         READ_BUF(4);
1074         rename->rn_snamelen = be32_to_cpup(p++);
1075         READ_BUF(rename->rn_snamelen + 4);
1076         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1077         rename->rn_tnamelen = be32_to_cpup(p++);
1078         READ_BUF(rename->rn_tnamelen);
1079         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1080         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1081                 return status;
1082         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1083                 return status;
1084
1085         DECODE_TAIL;
1086 }
1087
1088 static __be32
1089 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1090 {
1091         DECODE_HEAD;
1092
1093         if (argp->minorversion >= 1)
1094                 return nfserr_notsupp;
1095
1096         READ_BUF(sizeof(clientid_t));
1097         COPYMEM(clientid, sizeof(clientid_t));
1098
1099         DECODE_TAIL;
1100 }
1101
1102 static __be32
1103 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1104                      struct nfsd4_secinfo *secinfo)
1105 {
1106         DECODE_HEAD;
1107
1108         READ_BUF(4);
1109         secinfo->si_namelen = be32_to_cpup(p++);
1110         READ_BUF(secinfo->si_namelen);
1111         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1112         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1113         if (status)
1114                 return status;
1115         DECODE_TAIL;
1116 }
1117
1118 static __be32
1119 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1120                      struct nfsd4_secinfo_no_name *sin)
1121 {
1122         DECODE_HEAD;
1123
1124         READ_BUF(4);
1125         sin->sin_style = be32_to_cpup(p++);
1126         DECODE_TAIL;
1127 }
1128
1129 static __be32
1130 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1131 {
1132         __be32 status;
1133
1134         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1135         if (status)
1136                 return status;
1137         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1138                                   &setattr->sa_acl, &setattr->sa_label);
1139 }
1140
1141 static __be32
1142 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1143 {
1144         DECODE_HEAD;
1145
1146         if (argp->minorversion >= 1)
1147                 return nfserr_notsupp;
1148
1149         READ_BUF(NFS4_VERIFIER_SIZE);
1150         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1151
1152         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1153         if (status)
1154                 return nfserr_bad_xdr;
1155         READ_BUF(8);
1156         setclientid->se_callback_prog = be32_to_cpup(p++);
1157         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1158
1159         READ_BUF(setclientid->se_callback_netid_len + 4);
1160         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1161         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1162
1163         READ_BUF(setclientid->se_callback_addr_len + 4);
1164         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1165         setclientid->se_callback_ident = be32_to_cpup(p++);
1166
1167         DECODE_TAIL;
1168 }
1169
1170 static __be32
1171 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1172 {
1173         DECODE_HEAD;
1174
1175         if (argp->minorversion >= 1)
1176                 return nfserr_notsupp;
1177
1178         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1179         COPYMEM(&scd_c->sc_clientid, 8);
1180         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1181
1182         DECODE_TAIL;
1183 }
1184
1185 /* Also used for NVERIFY */
1186 static __be32
1187 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1188 {
1189         DECODE_HEAD;
1190
1191         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1192                 goto out;
1193
1194         /* For convenience's sake, we compare raw xdr'd attributes in
1195          * nfsd4_proc_verify */
1196
1197         READ_BUF(4);
1198         verify->ve_attrlen = be32_to_cpup(p++);
1199         READ_BUF(verify->ve_attrlen);
1200         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1201
1202         DECODE_TAIL;
1203 }
1204
1205 static __be32
1206 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1207 {
1208         int avail;
1209         int len;
1210         DECODE_HEAD;
1211
1212         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1213         if (status)
1214                 return status;
1215         READ_BUF(16);
1216         p = xdr_decode_hyper(p, &write->wr_offset);
1217         write->wr_stable_how = be32_to_cpup(p++);
1218         if (write->wr_stable_how > 2)
1219                 goto xdr_error;
1220         write->wr_buflen = be32_to_cpup(p++);
1221
1222         /* Sorry .. no magic macros for this.. *
1223          * READ_BUF(write->wr_buflen);
1224          * SAVEMEM(write->wr_buf, write->wr_buflen);
1225          */
1226         avail = (char*)argp->end - (char*)argp->p;
1227         if (avail + argp->pagelen < write->wr_buflen) {
1228                 dprintk("NFSD: xdr error (%s:%d)\n",
1229                                 __FILE__, __LINE__);
1230                 goto xdr_error;
1231         }
1232         write->wr_head.iov_base = p;
1233         write->wr_head.iov_len = avail;
1234         write->wr_pagelist = argp->pagelist;
1235
1236         len = XDR_QUADLEN(write->wr_buflen) << 2;
1237         if (len >= avail) {
1238                 int pages;
1239
1240                 len -= avail;
1241
1242                 pages = len >> PAGE_SHIFT;
1243                 argp->pagelist += pages;
1244                 argp->pagelen -= pages * PAGE_SIZE;
1245                 len -= pages * PAGE_SIZE;
1246
1247                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1248                 argp->pagelist++;
1249                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1250         }
1251         argp->p += XDR_QUADLEN(len);
1252
1253         DECODE_TAIL;
1254 }
1255
1256 static __be32
1257 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1258 {
1259         DECODE_HEAD;
1260
1261         if (argp->minorversion >= 1)
1262                 return nfserr_notsupp;
1263
1264         READ_BUF(12);
1265         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1266         rlockowner->rl_owner.len = be32_to_cpup(p++);
1267         READ_BUF(rlockowner->rl_owner.len);
1268         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1269
1270         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1271                 return nfserr_inval;
1272         DECODE_TAIL;
1273 }
1274
1275 static __be32
1276 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1277                          struct nfsd4_exchange_id *exid)
1278 {
1279         int dummy, tmp;
1280         DECODE_HEAD;
1281
1282         READ_BUF(NFS4_VERIFIER_SIZE);
1283         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1284
1285         status = nfsd4_decode_opaque(argp, &exid->clname);
1286         if (status)
1287                 return nfserr_bad_xdr;
1288
1289         READ_BUF(4);
1290         exid->flags = be32_to_cpup(p++);
1291
1292         /* Ignore state_protect4_a */
1293         READ_BUF(4);
1294         exid->spa_how = be32_to_cpup(p++);
1295         switch (exid->spa_how) {
1296         case SP4_NONE:
1297                 break;
1298         case SP4_MACH_CRED:
1299                 /* spo_must_enforce */
1300                 READ_BUF(4);
1301                 dummy = be32_to_cpup(p++);
1302                 READ_BUF(dummy * 4);
1303                 p += dummy;
1304
1305                 /* spo_must_allow */
1306                 READ_BUF(4);
1307                 dummy = be32_to_cpup(p++);
1308                 READ_BUF(dummy * 4);
1309                 p += dummy;
1310                 break;
1311         case SP4_SSV:
1312                 /* ssp_ops */
1313                 READ_BUF(4);
1314                 dummy = be32_to_cpup(p++);
1315                 READ_BUF(dummy * 4);
1316                 p += dummy;
1317
1318                 READ_BUF(4);
1319                 dummy = be32_to_cpup(p++);
1320                 READ_BUF(dummy * 4);
1321                 p += dummy;
1322
1323                 /* ssp_hash_algs<> */
1324                 READ_BUF(4);
1325                 tmp = be32_to_cpup(p++);
1326                 while (tmp--) {
1327                         READ_BUF(4);
1328                         dummy = be32_to_cpup(p++);
1329                         READ_BUF(dummy);
1330                         p += XDR_QUADLEN(dummy);
1331                 }
1332
1333                 /* ssp_encr_algs<> */
1334                 READ_BUF(4);
1335                 tmp = be32_to_cpup(p++);
1336                 while (tmp--) {
1337                         READ_BUF(4);
1338                         dummy = be32_to_cpup(p++);
1339                         READ_BUF(dummy);
1340                         p += XDR_QUADLEN(dummy);
1341                 }
1342
1343                 /* ssp_window and ssp_num_gss_handles */
1344                 READ_BUF(8);
1345                 dummy = be32_to_cpup(p++);
1346                 dummy = be32_to_cpup(p++);
1347                 break;
1348         default:
1349                 goto xdr_error;
1350         }
1351
1352         /* Ignore Implementation ID */
1353         READ_BUF(4);    /* nfs_impl_id4 array length */
1354         dummy = be32_to_cpup(p++);
1355
1356         if (dummy > 1)
1357                 goto xdr_error;
1358
1359         if (dummy == 1) {
1360                 /* nii_domain */
1361                 READ_BUF(4);
1362                 dummy = be32_to_cpup(p++);
1363                 READ_BUF(dummy);
1364                 p += XDR_QUADLEN(dummy);
1365
1366                 /* nii_name */
1367                 READ_BUF(4);
1368                 dummy = be32_to_cpup(p++);
1369                 READ_BUF(dummy);
1370                 p += XDR_QUADLEN(dummy);
1371
1372                 /* nii_date */
1373                 READ_BUF(12);
1374                 p += 3;
1375         }
1376         DECODE_TAIL;
1377 }
1378
1379 static __be32
1380 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1381                             struct nfsd4_create_session *sess)
1382 {
1383         DECODE_HEAD;
1384         u32 dummy;
1385
1386         READ_BUF(16);
1387         COPYMEM(&sess->clientid, 8);
1388         sess->seqid = be32_to_cpup(p++);
1389         sess->flags = be32_to_cpup(p++);
1390
1391         /* Fore channel attrs */
1392         READ_BUF(28);
1393         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1394         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1395         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1396         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1397         sess->fore_channel.maxops = be32_to_cpup(p++);
1398         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1399         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1400         if (sess->fore_channel.nr_rdma_attrs == 1) {
1401                 READ_BUF(4);
1402                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1403         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1404                 dprintk("Too many fore channel attr bitmaps!\n");
1405                 goto xdr_error;
1406         }
1407
1408         /* Back channel attrs */
1409         READ_BUF(28);
1410         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1411         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1412         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1413         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1414         sess->back_channel.maxops = be32_to_cpup(p++);
1415         sess->back_channel.maxreqs = be32_to_cpup(p++);
1416         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1417         if (sess->back_channel.nr_rdma_attrs == 1) {
1418                 READ_BUF(4);
1419                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1420         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1421                 dprintk("Too many back channel attr bitmaps!\n");
1422                 goto xdr_error;
1423         }
1424
1425         READ_BUF(4);
1426         sess->callback_prog = be32_to_cpup(p++);
1427         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1428         DECODE_TAIL;
1429 }
1430
1431 static __be32
1432 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1433                              struct nfsd4_destroy_session *destroy_session)
1434 {
1435         DECODE_HEAD;
1436         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1437         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1438
1439         DECODE_TAIL;
1440 }
1441
1442 static __be32
1443 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1444                           struct nfsd4_free_stateid *free_stateid)
1445 {
1446         DECODE_HEAD;
1447
1448         READ_BUF(sizeof(stateid_t));
1449         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1450         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1451
1452         DECODE_TAIL;
1453 }
1454
1455 static __be32
1456 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1457                       struct nfsd4_sequence *seq)
1458 {
1459         DECODE_HEAD;
1460
1461         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1462         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1463         seq->seqid = be32_to_cpup(p++);
1464         seq->slotid = be32_to_cpup(p++);
1465         seq->maxslots = be32_to_cpup(p++);
1466         seq->cachethis = be32_to_cpup(p++);
1467
1468         DECODE_TAIL;
1469 }
1470
1471 static __be32
1472 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1473 {
1474         int i;
1475         __be32 *p, status;
1476         struct nfsd4_test_stateid_id *stateid;
1477
1478         READ_BUF(4);
1479         test_stateid->ts_num_ids = ntohl(*p++);
1480
1481         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1482
1483         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1484                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1485                 if (!stateid) {
1486                         status = nfserrno(-ENOMEM);
1487                         goto out;
1488                 }
1489
1490                 INIT_LIST_HEAD(&stateid->ts_id_list);
1491                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1492
1493                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1494                 if (status)
1495                         goto out;
1496         }
1497
1498         status = 0;
1499 out:
1500         return status;
1501 xdr_error:
1502         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1503         status = nfserr_bad_xdr;
1504         goto out;
1505 }
1506
1507 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1508 {
1509         DECODE_HEAD;
1510
1511         READ_BUF(8);
1512         COPYMEM(&dc->clientid, 8);
1513
1514         DECODE_TAIL;
1515 }
1516
1517 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1518 {
1519         DECODE_HEAD;
1520
1521         READ_BUF(4);
1522         rc->rca_one_fs = be32_to_cpup(p++);
1523
1524         DECODE_TAIL;
1525 }
1526
1527 #ifdef CONFIG_NFSD_PNFS
1528 static __be32
1529 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1530                 struct nfsd4_getdeviceinfo *gdev)
1531 {
1532         DECODE_HEAD;
1533         u32 num, i;
1534
1535         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1536         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1537         gdev->gd_layout_type = be32_to_cpup(p++);
1538         gdev->gd_maxcount = be32_to_cpup(p++);
1539         num = be32_to_cpup(p++);
1540         if (num) {
1541                 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_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1679 {
1680         DECODE_HEAD;
1681
1682         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1683         if (status)
1684                 return status;
1685
1686         READ_BUF(8 + 4);
1687         p = xdr_decode_hyper(p, &seek->seek_offset);
1688         seek->seek_whence = be32_to_cpup(p);
1689
1690         DECODE_TAIL;
1691 }
1692
1693 static __be32
1694 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1695 {
1696         return nfs_ok;
1697 }
1698
1699 static __be32
1700 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1701 {
1702         return nfserr_notsupp;
1703 }
1704
1705 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1706
1707 static nfsd4_dec nfsd4_dec_ops[] = {
1708         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1709         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1710         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1711         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1712         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1713         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1714         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1715         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1716         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1717         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1718         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1719         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1720         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1721         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1722         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1723         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1724         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1725         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1726         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1727         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1728         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1729         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1730         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1731         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1732         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1733         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1734         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1735         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1736         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1737         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1738         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1739         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1740         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1741         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1742         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1743         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1744         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1745
1746         /* new operations for NFSv4.1 */
1747         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1748         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1749         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1750         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1751         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1752         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1753         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1754 #ifdef CONFIG_NFSD_PNFS
1755         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1756         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1757         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1758         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1759         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1760 #else
1761         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1762         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1763         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1764         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1765         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1766 #endif
1767         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1768         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1769         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1770         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1771         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1772         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1773         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1774
1775         /* new operations for NFSv4.2 */
1776         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1777         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_notsupp,
1778         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1779         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1780         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1781         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1782         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1783         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1784         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1785         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1786         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1787         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1788 };
1789
1790 static inline bool
1791 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1792 {
1793         if (op->opnum < FIRST_NFS4_OP)
1794                 return false;
1795         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1796                 return false;
1797         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1798                 return false;
1799         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1800                 return false;
1801         return true;
1802 }
1803
1804 static __be32
1805 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1806 {
1807         DECODE_HEAD;
1808         struct nfsd4_op *op;
1809         bool cachethis = false;
1810         int auth_slack= argp->rqstp->rq_auth_slack;
1811         int max_reply = auth_slack + 8; /* opcnt, status */
1812         int readcount = 0;
1813         int readbytes = 0;
1814         int i;
1815
1816         READ_BUF(4);
1817         argp->taglen = be32_to_cpup(p++);
1818         READ_BUF(argp->taglen + 8);
1819         SAVEMEM(argp->tag, argp->taglen);
1820         argp->minorversion = be32_to_cpup(p++);
1821         argp->opcnt = be32_to_cpup(p++);
1822         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1823
1824         if (argp->taglen > NFSD4_MAX_TAGLEN)
1825                 goto xdr_error;
1826         if (argp->opcnt > 100)
1827                 goto xdr_error;
1828
1829         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1830                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1831                 if (!argp->ops) {
1832                         argp->ops = argp->iops;
1833                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1834                         goto xdr_error;
1835                 }
1836         }
1837
1838         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1839                 argp->opcnt = 0;
1840
1841         for (i = 0; i < argp->opcnt; i++) {
1842                 op = &argp->ops[i];
1843                 op->replay = NULL;
1844
1845                 READ_BUF(4);
1846                 op->opnum = be32_to_cpup(p++);
1847
1848                 if (nfsd4_opnum_in_range(argp, op))
1849                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1850                 else {
1851                         op->opnum = OP_ILLEGAL;
1852                         op->status = nfserr_op_illegal;
1853                 }
1854                 /*
1855                  * We'll try to cache the result in the DRC if any one
1856                  * op in the compound wants to be cached:
1857                  */
1858                 cachethis |= nfsd4_cache_this_op(op);
1859
1860                 if (op->opnum == OP_READ) {
1861                         readcount++;
1862                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1863                 } else
1864                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1865                 /*
1866                  * OP_LOCK may return a conflicting lock.  (Special case
1867                  * because it will just skip encoding this if it runs
1868                  * out of xdr buffer space, and it is the only operation
1869                  * that behaves this way.)
1870                  */
1871                 if (op->opnum == OP_LOCK)
1872                         max_reply += NFS4_OPAQUE_LIMIT;
1873
1874                 if (op->status) {
1875                         argp->opcnt = i+1;
1876                         break;
1877                 }
1878         }
1879         /* Sessions make the DRC unnecessary: */
1880         if (argp->minorversion)
1881                 cachethis = false;
1882         svc_reserve(argp->rqstp, max_reply + readbytes);
1883         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1884
1885         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1886                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1887
1888         DECODE_TAIL;
1889 }
1890
1891 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1892 {
1893         if (IS_I_VERSION(inode)) {
1894                 p = xdr_encode_hyper(p, inode->i_version);
1895         } else {
1896                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1897                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1898         }
1899         return p;
1900 }
1901
1902 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1903 {
1904         *p++ = cpu_to_be32(c->atomic);
1905         if (c->change_supported) {
1906                 p = xdr_encode_hyper(p, c->before_change);
1907                 p = xdr_encode_hyper(p, c->after_change);
1908         } else {
1909                 *p++ = cpu_to_be32(c->before_ctime_sec);
1910                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1911                 *p++ = cpu_to_be32(c->after_ctime_sec);
1912                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1913         }
1914         return p;
1915 }
1916
1917 /* Encode as an array of strings the string given with components
1918  * separated @sep, escaped with esc_enter and esc_exit.
1919  */
1920 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1921                                           char *components, char esc_enter,
1922                                           char esc_exit)
1923 {
1924         __be32 *p;
1925         __be32 pathlen;
1926         int pathlen_offset;
1927         int strlen, count=0;
1928         char *str, *end, *next;
1929
1930         dprintk("nfsd4_encode_components(%s)\n", components);
1931
1932         pathlen_offset = xdr->buf->len;
1933         p = xdr_reserve_space(xdr, 4);
1934         if (!p)
1935                 return nfserr_resource;
1936         p++; /* We will fill this in with @count later */
1937
1938         end = str = components;
1939         while (*end) {
1940                 bool found_esc = false;
1941
1942                 /* try to parse as esc_start, ..., esc_end, sep */
1943                 if (*str == esc_enter) {
1944                         for (; *end && (*end != esc_exit); end++)
1945                                 /* find esc_exit or end of string */;
1946                         next = end + 1;
1947                         if (*end && (!*next || *next == sep)) {
1948                                 str++;
1949                                 found_esc = true;
1950                         }
1951                 }
1952
1953                 if (!found_esc)
1954                         for (; *end && (*end != sep); end++)
1955                                 /* find sep or end of string */;
1956
1957                 strlen = end - str;
1958                 if (strlen) {
1959                         p = xdr_reserve_space(xdr, strlen + 4);
1960                         if (!p)
1961                                 return nfserr_resource;
1962                         p = xdr_encode_opaque(p, str, strlen);
1963                         count++;
1964                 }
1965                 else
1966                         end++;
1967                 if (found_esc)
1968                         end = next;
1969
1970                 str = end;
1971         }
1972         pathlen = htonl(count);
1973         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1974         return 0;
1975 }
1976
1977 /* Encode as an array of strings the string given with components
1978  * separated @sep.
1979  */
1980 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1981                                       char *components)
1982 {
1983         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1984 }
1985
1986 /*
1987  * encode a location element of a fs_locations structure
1988  */
1989 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1990                                         struct nfsd4_fs_location *location)
1991 {
1992         __be32 status;
1993
1994         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1995                                                 '[', ']');
1996         if (status)
1997                 return status;
1998         status = nfsd4_encode_components(xdr, '/', location->path);
1999         if (status)
2000                 return status;
2001         return 0;
2002 }
2003
2004 /*
2005  * Encode a path in RFC3530 'pathname4' format
2006  */
2007 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2008                                 const struct path *root,
2009                                 const struct path *path)
2010 {
2011         struct path cur = *path;
2012         __be32 *p;
2013         struct dentry **components = NULL;
2014         unsigned int ncomponents = 0;
2015         __be32 err = nfserr_jukebox;
2016
2017         dprintk("nfsd4_encode_components(");
2018
2019         path_get(&cur);
2020         /* First walk the path up to the nfsd root, and store the
2021          * dentries/path components in an array.
2022          */
2023         for (;;) {
2024                 if (path_equal(&cur, root))
2025                         break;
2026                 if (cur.dentry == cur.mnt->mnt_root) {
2027                         if (follow_up(&cur))
2028                                 continue;
2029                         goto out_free;
2030                 }
2031                 if ((ncomponents & 15) == 0) {
2032                         struct dentry **new;
2033                         new = krealloc(components,
2034                                         sizeof(*new) * (ncomponents + 16),
2035                                         GFP_KERNEL);
2036                         if (!new)
2037                                 goto out_free;
2038                         components = new;
2039                 }
2040                 components[ncomponents++] = cur.dentry;
2041                 cur.dentry = dget_parent(cur.dentry);
2042         }
2043         err = nfserr_resource;
2044         p = xdr_reserve_space(xdr, 4);
2045         if (!p)
2046                 goto out_free;
2047         *p++ = cpu_to_be32(ncomponents);
2048
2049         while (ncomponents) {
2050                 struct dentry *dentry = components[ncomponents - 1];
2051                 unsigned int len;
2052
2053                 spin_lock(&dentry->d_lock);
2054                 len = dentry->d_name.len;
2055                 p = xdr_reserve_space(xdr, len + 4);
2056                 if (!p) {
2057                         spin_unlock(&dentry->d_lock);
2058                         goto out_free;
2059                 }
2060                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2061                 dprintk("/%pd", dentry);
2062                 spin_unlock(&dentry->d_lock);
2063                 dput(dentry);
2064                 ncomponents--;
2065         }
2066
2067         err = 0;
2068 out_free:
2069         dprintk(")\n");
2070         while (ncomponents)
2071                 dput(components[--ncomponents]);
2072         kfree(components);
2073         path_put(&cur);
2074         return err;
2075 }
2076
2077 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2078                         struct svc_rqst *rqstp, const struct path *path)
2079 {
2080         struct svc_export *exp_ps;
2081         __be32 res;
2082
2083         exp_ps = rqst_find_fsidzero_export(rqstp);
2084         if (IS_ERR(exp_ps))
2085                 return nfserrno(PTR_ERR(exp_ps));
2086         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2087         exp_put(exp_ps);
2088         return res;
2089 }
2090
2091 /*
2092  *  encode a fs_locations structure
2093  */
2094 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2095                         struct svc_rqst *rqstp, struct svc_export *exp)
2096 {
2097         __be32 status;
2098         int i;
2099         __be32 *p;
2100         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2101
2102         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2103         if (status)
2104                 return status;
2105         p = xdr_reserve_space(xdr, 4);
2106         if (!p)
2107                 return nfserr_resource;
2108         *p++ = cpu_to_be32(fslocs->locations_count);
2109         for (i=0; i<fslocs->locations_count; i++) {
2110                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2111                 if (status)
2112                         return status;
2113         }
2114         return 0;
2115 }
2116
2117 static u32 nfs4_file_type(umode_t mode)
2118 {
2119         switch (mode & S_IFMT) {
2120         case S_IFIFO:   return NF4FIFO;
2121         case S_IFCHR:   return NF4CHR;
2122         case S_IFDIR:   return NF4DIR;
2123         case S_IFBLK:   return NF4BLK;
2124         case S_IFLNK:   return NF4LNK;
2125         case S_IFREG:   return NF4REG;
2126         case S_IFSOCK:  return NF4SOCK;
2127         default:        return NF4BAD;
2128         };
2129 }
2130
2131 static inline __be32
2132 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2133                      struct nfs4_ace *ace)
2134 {
2135         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2136                 return nfs4_acl_write_who(xdr, ace->whotype);
2137         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2138                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2139         else
2140                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2141 }
2142
2143 static inline __be32
2144 nfsd4_encode_layout_type(struct xdr_stream *xdr, enum pnfs_layouttype layout_type)
2145 {
2146         __be32 *p;
2147
2148         if (layout_type) {
2149                 p = xdr_reserve_space(xdr, 8);
2150                 if (!p)
2151                         return nfserr_resource;
2152                 *p++ = cpu_to_be32(1);
2153                 *p++ = cpu_to_be32(layout_type);
2154         } else {
2155                 p = xdr_reserve_space(xdr, 4);
2156                 if (!p)
2157                         return nfserr_resource;
2158                 *p++ = cpu_to_be32(0);
2159         }
2160
2161         return 0;
2162 }
2163
2164 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2165                               FATTR4_WORD0_RDATTR_ERROR)
2166 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2167 #define WORD2_ABSENT_FS_ATTRS 0
2168
2169 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2170 static inline __be32
2171 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2172                             void *context, int len)
2173 {
2174         __be32 *p;
2175
2176         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2177         if (!p)
2178                 return nfserr_resource;
2179
2180         /*
2181          * For now we use a 0 here to indicate the null translation; in
2182          * the future we may place a call to translation code here.
2183          */
2184         *p++ = cpu_to_be32(0); /* lfs */
2185         *p++ = cpu_to_be32(0); /* pi */
2186         p = xdr_encode_opaque(p, context, len);
2187         return 0;
2188 }
2189 #else
2190 static inline __be32
2191 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2192                             void *context, int len)
2193 { return 0; }
2194 #endif
2195
2196 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2197 {
2198         /* As per referral draft:  */
2199         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2200             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2201                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2202                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2203                         *rdattr_err = NFSERR_MOVED;
2204                 else
2205                         return nfserr_moved;
2206         }
2207         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2208         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2209         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2210         return 0;
2211 }
2212
2213
2214 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2215 {
2216         struct path path = exp->ex_path;
2217         int err;
2218
2219         path_get(&path);
2220         while (follow_up(&path)) {
2221                 if (path.dentry != path.mnt->mnt_root)
2222                         break;
2223         }
2224         err = vfs_getattr(&path, stat);
2225         path_put(&path);
2226         return err;
2227 }
2228
2229 static __be32
2230 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2231 {
2232         __be32 *p;
2233
2234         if (bmval2) {
2235                 p = xdr_reserve_space(xdr, 16);
2236                 if (!p)
2237                         goto out_resource;
2238                 *p++ = cpu_to_be32(3);
2239                 *p++ = cpu_to_be32(bmval0);
2240                 *p++ = cpu_to_be32(bmval1);
2241                 *p++ = cpu_to_be32(bmval2);
2242         } else if (bmval1) {
2243                 p = xdr_reserve_space(xdr, 12);
2244                 if (!p)
2245                         goto out_resource;
2246                 *p++ = cpu_to_be32(2);
2247                 *p++ = cpu_to_be32(bmval0);
2248                 *p++ = cpu_to_be32(bmval1);
2249         } else {
2250                 p = xdr_reserve_space(xdr, 8);
2251                 if (!p)
2252                         goto out_resource;
2253                 *p++ = cpu_to_be32(1);
2254                 *p++ = cpu_to_be32(bmval0);
2255         }
2256
2257         return 0;
2258 out_resource:
2259         return nfserr_resource;
2260 }
2261
2262 /*
2263  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2264  * ourselves.
2265  */
2266 static __be32
2267 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2268                 struct svc_export *exp,
2269                 struct dentry *dentry, u32 *bmval,
2270                 struct svc_rqst *rqstp, int ignore_crossmnt)
2271 {
2272         u32 bmval0 = bmval[0];
2273         u32 bmval1 = bmval[1];
2274         u32 bmval2 = bmval[2];
2275         struct kstat stat;
2276         struct svc_fh *tempfh = NULL;
2277         struct kstatfs statfs;
2278         __be32 *p;
2279         int starting_len = xdr->buf->len;
2280         int attrlen_offset;
2281         __be32 attrlen;
2282         u32 dummy;
2283         u64 dummy64;
2284         u32 rdattr_err = 0;
2285         __be32 status;
2286         int err;
2287         struct nfs4_acl *acl = NULL;
2288         void *context = NULL;
2289         int contextlen;
2290         bool contextsupport = false;
2291         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2292         u32 minorversion = resp->cstate.minorversion;
2293         struct path path = {
2294                 .mnt    = exp->ex_path.mnt,
2295                 .dentry = dentry,
2296         };
2297         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2298
2299         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2300         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2301         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2302         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2303
2304         if (exp->ex_fslocs.migrated) {
2305                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2306                 if (status)
2307                         goto out;
2308         }
2309
2310         err = vfs_getattr(&path, &stat);
2311         if (err)
2312                 goto out_nfserr;
2313         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2314                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2315             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2316                        FATTR4_WORD1_SPACE_TOTAL))) {
2317                 err = vfs_statfs(&path, &statfs);
2318                 if (err)
2319                         goto out_nfserr;
2320         }
2321         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2322                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2323                 status = nfserr_jukebox;
2324                 if (!tempfh)
2325                         goto out;
2326                 fh_init(tempfh, NFS4_FHSIZE);
2327                 status = fh_compose(tempfh, exp, dentry, NULL);
2328                 if (status)
2329                         goto out;
2330                 fhp = tempfh;
2331         }
2332         if (bmval0 & FATTR4_WORD0_ACL) {
2333                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2334                 if (err == -EOPNOTSUPP)
2335                         bmval0 &= ~FATTR4_WORD0_ACL;
2336                 else if (err == -EINVAL) {
2337                         status = nfserr_attrnotsupp;
2338                         goto out;
2339                 } else if (err != 0)
2340                         goto out_nfserr;
2341         }
2342
2343 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2344         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2345              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2346                 err = security_inode_getsecctx(d_inode(dentry),
2347                                                 &context, &contextlen);
2348                 contextsupport = (err == 0);
2349                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2350                         if (err == -EOPNOTSUPP)
2351                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2352                         else if (err)
2353                                 goto out_nfserr;
2354                 }
2355         }
2356 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2357
2358         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2359         if (status)
2360                 goto out;
2361
2362         attrlen_offset = xdr->buf->len;
2363         p = xdr_reserve_space(xdr, 4);
2364         if (!p)
2365                 goto out_resource;
2366         p++;                /* to be backfilled later */
2367
2368         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2369                 u32 word0 = nfsd_suppattrs0(minorversion);
2370                 u32 word1 = nfsd_suppattrs1(minorversion);
2371                 u32 word2 = nfsd_suppattrs2(minorversion);
2372
2373                 if (!IS_POSIXACL(dentry->d_inode))
2374                         word0 &= ~FATTR4_WORD0_ACL;
2375                 if (!contextsupport)
2376                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2377                 if (!word2) {
2378                         p = xdr_reserve_space(xdr, 12);
2379                         if (!p)
2380                                 goto out_resource;
2381                         *p++ = cpu_to_be32(2);
2382                         *p++ = cpu_to_be32(word0);
2383                         *p++ = cpu_to_be32(word1);
2384                 } else {
2385                         p = xdr_reserve_space(xdr, 16);
2386                         if (!p)
2387                                 goto out_resource;
2388                         *p++ = cpu_to_be32(3);
2389                         *p++ = cpu_to_be32(word0);
2390                         *p++ = cpu_to_be32(word1);
2391                         *p++ = cpu_to_be32(word2);
2392                 }
2393         }
2394         if (bmval0 & FATTR4_WORD0_TYPE) {
2395                 p = xdr_reserve_space(xdr, 4);
2396                 if (!p)
2397                         goto out_resource;
2398                 dummy = nfs4_file_type(stat.mode);
2399                 if (dummy == NF4BAD) {
2400                         status = nfserr_serverfault;
2401                         goto out;
2402                 }
2403                 *p++ = cpu_to_be32(dummy);
2404         }
2405         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2406                 p = xdr_reserve_space(xdr, 4);
2407                 if (!p)
2408                         goto out_resource;
2409                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2410                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2411                 else
2412                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2413                                                 NFS4_FH_VOL_RENAME);
2414         }
2415         if (bmval0 & FATTR4_WORD0_CHANGE) {
2416                 p = xdr_reserve_space(xdr, 8);
2417                 if (!p)
2418                         goto out_resource;
2419                 p = encode_change(p, &stat, d_inode(dentry));
2420         }
2421         if (bmval0 & FATTR4_WORD0_SIZE) {
2422                 p = xdr_reserve_space(xdr, 8);
2423                 if (!p)
2424                         goto out_resource;
2425                 p = xdr_encode_hyper(p, stat.size);
2426         }
2427         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2428                 p = xdr_reserve_space(xdr, 4);
2429                 if (!p)
2430                         goto out_resource;
2431                 *p++ = cpu_to_be32(1);
2432         }
2433         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2434                 p = xdr_reserve_space(xdr, 4);
2435                 if (!p)
2436                         goto out_resource;
2437                 *p++ = cpu_to_be32(1);
2438         }
2439         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2440                 p = xdr_reserve_space(xdr, 4);
2441                 if (!p)
2442                         goto out_resource;
2443                 *p++ = cpu_to_be32(0);
2444         }
2445         if (bmval0 & FATTR4_WORD0_FSID) {
2446                 p = xdr_reserve_space(xdr, 16);
2447                 if (!p)
2448                         goto out_resource;
2449                 if (exp->ex_fslocs.migrated) {
2450                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2451                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2452                 } else switch(fsid_source(fhp)) {
2453                 case FSIDSOURCE_FSID:
2454                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2455                         p = xdr_encode_hyper(p, (u64)0);
2456                         break;
2457                 case FSIDSOURCE_DEV:
2458                         *p++ = cpu_to_be32(0);
2459                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2460                         *p++ = cpu_to_be32(0);
2461                         *p++ = cpu_to_be32(MINOR(stat.dev));
2462                         break;
2463                 case FSIDSOURCE_UUID:
2464                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2465                                                                 EX_UUID_LEN);
2466                         break;
2467                 }
2468         }
2469         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2470                 p = xdr_reserve_space(xdr, 4);
2471                 if (!p)
2472                         goto out_resource;
2473                 *p++ = cpu_to_be32(0);
2474         }
2475         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2476                 p = xdr_reserve_space(xdr, 4);
2477                 if (!p)
2478                         goto out_resource;
2479                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2480         }
2481         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2482                 p = xdr_reserve_space(xdr, 4);
2483                 if (!p)
2484                         goto out_resource;
2485                 *p++ = cpu_to_be32(rdattr_err);
2486         }
2487         if (bmval0 & FATTR4_WORD0_ACL) {
2488                 struct nfs4_ace *ace;
2489
2490                 if (acl == NULL) {
2491                         p = xdr_reserve_space(xdr, 4);
2492                         if (!p)
2493                                 goto out_resource;
2494
2495                         *p++ = cpu_to_be32(0);
2496                         goto out_acl;
2497                 }
2498                 p = xdr_reserve_space(xdr, 4);
2499                 if (!p)
2500                         goto out_resource;
2501                 *p++ = cpu_to_be32(acl->naces);
2502
2503                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2504                         p = xdr_reserve_space(xdr, 4*3);
2505                         if (!p)
2506                                 goto out_resource;
2507                         *p++ = cpu_to_be32(ace->type);
2508                         *p++ = cpu_to_be32(ace->flag);
2509                         *p++ = cpu_to_be32(ace->access_mask &
2510                                                         NFS4_ACE_MASK_ALL);
2511                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2512                         if (status)
2513                                 goto out;
2514                 }
2515         }
2516 out_acl:
2517         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2518                 p = xdr_reserve_space(xdr, 4);
2519                 if (!p)
2520                         goto out_resource;
2521                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2522                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2523         }
2524         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2525                 p = xdr_reserve_space(xdr, 4);
2526                 if (!p)
2527                         goto out_resource;
2528                 *p++ = cpu_to_be32(1);
2529         }
2530         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2531                 p = xdr_reserve_space(xdr, 4);
2532                 if (!p)
2533                         goto out_resource;
2534                 *p++ = cpu_to_be32(0);
2535         }
2536         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2537                 p = xdr_reserve_space(xdr, 4);
2538                 if (!p)
2539                         goto out_resource;
2540                 *p++ = cpu_to_be32(1);
2541         }
2542         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2543                 p = xdr_reserve_space(xdr, 4);
2544                 if (!p)
2545                         goto out_resource;
2546                 *p++ = cpu_to_be32(1);
2547         }
2548         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2549                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2550                 if (!p)
2551                         goto out_resource;
2552                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2553                                         fhp->fh_handle.fh_size);
2554         }
2555         if (bmval0 & FATTR4_WORD0_FILEID) {
2556                 p = xdr_reserve_space(xdr, 8);
2557                 if (!p)
2558                         goto out_resource;
2559                 p = xdr_encode_hyper(p, stat.ino);
2560         }
2561         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2562                 p = xdr_reserve_space(xdr, 8);
2563                 if (!p)
2564                         goto out_resource;
2565                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2566         }
2567         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2568                 p = xdr_reserve_space(xdr, 8);
2569                 if (!p)
2570                         goto out_resource;
2571                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2572         }
2573         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2574                 p = xdr_reserve_space(xdr, 8);
2575                 if (!p)
2576                         goto out_resource;
2577                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2578         }
2579         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2580                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2581                 if (status)
2582                         goto out;
2583         }
2584         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2585                 p = xdr_reserve_space(xdr, 4);
2586                 if (!p)
2587                         goto out_resource;
2588                 *p++ = cpu_to_be32(1);
2589         }
2590         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2591                 p = xdr_reserve_space(xdr, 8);
2592                 if (!p)
2593                         goto out_resource;
2594                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2595         }
2596         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2597                 p = xdr_reserve_space(xdr, 4);
2598                 if (!p)
2599                         goto out_resource;
2600                 *p++ = cpu_to_be32(255);
2601         }
2602         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2603                 p = xdr_reserve_space(xdr, 4);
2604                 if (!p)
2605                         goto out_resource;
2606                 *p++ = cpu_to_be32(statfs.f_namelen);
2607         }
2608         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2609                 p = xdr_reserve_space(xdr, 8);
2610                 if (!p)
2611                         goto out_resource;
2612                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2613         }
2614         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2615                 p = xdr_reserve_space(xdr, 8);
2616                 if (!p)
2617                         goto out_resource;
2618                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2619         }
2620         if (bmval1 & FATTR4_WORD1_MODE) {
2621                 p = xdr_reserve_space(xdr, 4);
2622                 if (!p)
2623                         goto out_resource;
2624                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2625         }
2626         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2627                 p = xdr_reserve_space(xdr, 4);
2628                 if (!p)
2629                         goto out_resource;
2630                 *p++ = cpu_to_be32(1);
2631         }
2632         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2633                 p = xdr_reserve_space(xdr, 4);
2634                 if (!p)
2635                         goto out_resource;
2636                 *p++ = cpu_to_be32(stat.nlink);
2637         }
2638         if (bmval1 & FATTR4_WORD1_OWNER) {
2639                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2640                 if (status)
2641                         goto out;
2642         }
2643         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2644                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2645                 if (status)
2646                         goto out;
2647         }
2648         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2649                 p = xdr_reserve_space(xdr, 8);
2650                 if (!p)
2651                         goto out_resource;
2652                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2653                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2654         }
2655         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2656                 p = xdr_reserve_space(xdr, 8);
2657                 if (!p)
2658                         goto out_resource;
2659                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2660                 p = xdr_encode_hyper(p, dummy64);
2661         }
2662         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2663                 p = xdr_reserve_space(xdr, 8);
2664                 if (!p)
2665                         goto out_resource;
2666                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2667                 p = xdr_encode_hyper(p, dummy64);
2668         }
2669         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2670                 p = xdr_reserve_space(xdr, 8);
2671                 if (!p)
2672                         goto out_resource;
2673                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2674                 p = xdr_encode_hyper(p, dummy64);
2675         }
2676         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2677                 p = xdr_reserve_space(xdr, 8);
2678                 if (!p)
2679                         goto out_resource;
2680                 dummy64 = (u64)stat.blocks << 9;
2681                 p = xdr_encode_hyper(p, dummy64);
2682         }
2683         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2684                 p = xdr_reserve_space(xdr, 12);
2685                 if (!p)
2686                         goto out_resource;
2687                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2688                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2689         }
2690         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2691                 p = xdr_reserve_space(xdr, 12);
2692                 if (!p)
2693                         goto out_resource;
2694                 *p++ = cpu_to_be32(0);
2695                 *p++ = cpu_to_be32(1);
2696                 *p++ = cpu_to_be32(0);
2697         }
2698         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2699                 p = xdr_reserve_space(xdr, 12);
2700                 if (!p)
2701                         goto out_resource;
2702                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2703                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2704         }
2705         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2706                 p = xdr_reserve_space(xdr, 12);
2707                 if (!p)
2708                         goto out_resource;
2709                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2710                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2711         }
2712         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2713                 struct kstat parent_stat;
2714                 u64 ino = stat.ino;
2715
2716                 p = xdr_reserve_space(xdr, 8);
2717                 if (!p)
2718                         goto out_resource;
2719                 /*
2720                  * Get parent's attributes if not ignoring crossmount
2721                  * and this is the root of a cross-mounted filesystem.
2722                  */
2723                 if (ignore_crossmnt == 0 &&
2724                     dentry == exp->ex_path.mnt->mnt_root) {
2725                         err = get_parent_attributes(exp, &parent_stat);
2726                         if (err)
2727                                 goto out_nfserr;
2728                         ino = parent_stat.ino;
2729                 }
2730                 p = xdr_encode_hyper(p, ino);
2731         }
2732 #ifdef CONFIG_NFSD_PNFS
2733         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2734                 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2735                 if (status)
2736                         goto out;
2737         }
2738
2739         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2740                 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2741                 if (status)
2742                         goto out;
2743         }
2744
2745         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2746                 p = xdr_reserve_space(xdr, 4);
2747                 if (!p)
2748                         goto out_resource;
2749                 *p++ = cpu_to_be32(stat.blksize);
2750         }
2751 #endif /* CONFIG_NFSD_PNFS */
2752         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2753                 status = nfsd4_encode_bitmap(xdr, NFSD_SUPPATTR_EXCLCREAT_WORD0,
2754                                                   NFSD_SUPPATTR_EXCLCREAT_WORD1,
2755                                                   NFSD_SUPPATTR_EXCLCREAT_WORD2);
2756                 if (status)
2757                         goto out;
2758         }
2759
2760         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2761                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2762                                                                 contextlen);
2763                 if (status)
2764                         goto out;
2765         }
2766
2767         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2768         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2769         status = nfs_ok;
2770
2771 out:
2772 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2773         if (context)
2774                 security_release_secctx(context, contextlen);
2775 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2776         kfree(acl);
2777         if (tempfh) {
2778                 fh_put(tempfh);
2779                 kfree(tempfh);
2780         }
2781         if (status)
2782                 xdr_truncate_encode(xdr, starting_len);
2783         return status;
2784 out_nfserr:
2785         status = nfserrno(err);
2786         goto out;
2787 out_resource:
2788         status = nfserr_resource;
2789         goto out;
2790 }
2791
2792 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2793                                 struct xdr_buf *buf, __be32 *p, int bytes)
2794 {
2795         xdr->scratch.iov_len = 0;
2796         memset(buf, 0, sizeof(struct xdr_buf));
2797         buf->head[0].iov_base = p;
2798         buf->head[0].iov_len = 0;
2799         buf->len = 0;
2800         xdr->buf = buf;
2801         xdr->iov = buf->head;
2802         xdr->p = p;
2803         xdr->end = (void *)p + bytes;
2804         buf->buflen = bytes;
2805 }
2806
2807 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2808                         struct svc_fh *fhp, struct svc_export *exp,
2809                         struct dentry *dentry, u32 *bmval,
2810                         struct svc_rqst *rqstp, int ignore_crossmnt)
2811 {
2812         struct xdr_buf dummy;
2813         struct xdr_stream xdr;
2814         __be32 ret;
2815
2816         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2817         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2818                                                         ignore_crossmnt);
2819         *p = xdr.p;
2820         return ret;
2821 }
2822
2823 static inline int attributes_need_mount(u32 *bmval)
2824 {
2825         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2826                 return 1;
2827         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2828                 return 1;
2829         return 0;
2830 }
2831
2832 static __be32
2833 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2834                         const char *name, int namlen)
2835 {
2836         struct svc_export *exp = cd->rd_fhp->fh_export;
2837         struct dentry *dentry;
2838         __be32 nfserr;
2839         int ignore_crossmnt = 0;
2840
2841         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2842         if (IS_ERR(dentry))
2843                 return nfserrno(PTR_ERR(dentry));
2844         if (d_really_is_negative(dentry)) {
2845                 /*
2846                  * nfsd_buffered_readdir drops the i_mutex between
2847                  * readdir and calling this callback, leaving a window
2848                  * where this directory entry could have gone away.
2849                  */
2850                 dput(dentry);
2851                 return nfserr_noent;
2852         }
2853
2854         exp_get(exp);
2855         /*
2856          * In the case of a mountpoint, the client may be asking for
2857          * attributes that are only properties of the underlying filesystem
2858          * as opposed to the cross-mounted file system. In such a case,
2859          * we will not follow the cross mount and will fill the attribtutes
2860          * directly from the mountpoint dentry.
2861          */
2862         if (nfsd_mountpoint(dentry, exp)) {
2863                 int err;
2864
2865                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2866                                 && !attributes_need_mount(cd->rd_bmval)) {
2867                         ignore_crossmnt = 1;
2868                         goto out_encode;
2869                 }
2870                 /*
2871                  * Why the heck aren't we just using nfsd_lookup??
2872                  * Different "."/".." handling?  Something else?
2873                  * At least, add a comment here to explain....
2874                  */
2875                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2876                 if (err) {
2877                         nfserr = nfserrno(err);
2878                         goto out_put;
2879                 }
2880                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2881                 if (nfserr)
2882                         goto out_put;
2883
2884         }
2885 out_encode:
2886         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2887                                         cd->rd_rqstp, ignore_crossmnt);
2888 out_put:
2889         dput(dentry);
2890         exp_put(exp);
2891         return nfserr;
2892 }
2893
2894 static __be32 *
2895 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2896 {
2897         __be32 *p;
2898
2899         p = xdr_reserve_space(xdr, 20);
2900         if (!p)
2901                 return NULL;
2902         *p++ = htonl(2);
2903         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2904         *p++ = htonl(0);                         /* bmval1 */
2905
2906         *p++ = htonl(4);     /* attribute length */
2907         *p++ = nfserr;       /* no htonl */
2908         return p;
2909 }
2910
2911 static int
2912 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2913                     loff_t offset, u64 ino, unsigned int d_type)
2914 {
2915         struct readdir_cd *ccd = ccdv;
2916         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2917         struct xdr_stream *xdr = cd->xdr;
2918         int start_offset = xdr->buf->len;
2919         int cookie_offset;
2920         u32 name_and_cookie;
2921         int entry_bytes;
2922         __be32 nfserr = nfserr_toosmall;
2923         __be64 wire_offset;
2924         __be32 *p;
2925
2926         /* In nfsv4, "." and ".." never make it onto the wire.. */
2927         if (name && isdotent(name, namlen)) {
2928                 cd->common.err = nfs_ok;
2929                 return 0;
2930         }
2931
2932         if (cd->cookie_offset) {
2933                 wire_offset = cpu_to_be64(offset);
2934                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2935                                                         &wire_offset, 8);
2936         }
2937
2938         p = xdr_reserve_space(xdr, 4);
2939         if (!p)
2940                 goto fail;
2941         *p++ = xdr_one;                             /* mark entry present */
2942         cookie_offset = xdr->buf->len;
2943         p = xdr_reserve_space(xdr, 3*4 + namlen);
2944         if (!p)
2945                 goto fail;
2946         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2947         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2948
2949         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2950         switch (nfserr) {
2951         case nfs_ok:
2952                 break;
2953         case nfserr_resource:
2954                 nfserr = nfserr_toosmall;
2955                 goto fail;
2956         case nfserr_noent:
2957                 xdr_truncate_encode(xdr, start_offset);
2958                 goto skip_entry;
2959         default:
2960                 /*
2961                  * If the client requested the RDATTR_ERROR attribute,
2962                  * we stuff the error code into this attribute
2963                  * and continue.  If this attribute was not requested,
2964                  * then in accordance with the spec, we fail the
2965                  * entire READDIR operation(!)
2966                  */
2967                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2968                         goto fail;
2969                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2970                 if (p == NULL) {
2971                         nfserr = nfserr_toosmall;
2972                         goto fail;
2973                 }
2974         }
2975         nfserr = nfserr_toosmall;
2976         entry_bytes = xdr->buf->len - start_offset;
2977         if (entry_bytes > cd->rd_maxcount)
2978                 goto fail;
2979         cd->rd_maxcount -= entry_bytes;
2980         /*
2981          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
2982          * let's always let through the first entry, at least:
2983          */
2984         if (!cd->rd_dircount)
2985                 goto fail;
2986         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
2987         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
2988                 goto fail;
2989         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
2990
2991         cd->cookie_offset = cookie_offset;
2992 skip_entry:
2993         cd->common.err = nfs_ok;
2994         return 0;
2995 fail:
2996         xdr_truncate_encode(xdr, start_offset);
2997         cd->common.err = nfserr;
2998         return -EINVAL;
2999 }
3000
3001 static __be32
3002 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3003 {
3004         __be32 *p;
3005
3006         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3007         if (!p)
3008                 return nfserr_resource;
3009         *p++ = cpu_to_be32(sid->si_generation);
3010         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3011                                         sizeof(stateid_opaque_t));
3012         return 0;
3013 }
3014
3015 static __be32
3016 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3017 {
3018         struct xdr_stream *xdr = &resp->xdr;
3019         __be32 *p;
3020
3021         if (!nfserr) {
3022                 p = xdr_reserve_space(xdr, 8);
3023                 if (!p)
3024                         return nfserr_resource;
3025                 *p++ = cpu_to_be32(access->ac_supported);
3026                 *p++ = cpu_to_be32(access->ac_resp_access);
3027         }
3028         return nfserr;
3029 }
3030
3031 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3032 {
3033         struct xdr_stream *xdr = &resp->xdr;
3034         __be32 *p;
3035
3036         if (!nfserr) {
3037                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3038                 if (!p)
3039                         return nfserr_resource;
3040                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3041                                                 NFS4_MAX_SESSIONID_LEN);
3042                 *p++ = cpu_to_be32(bcts->dir);
3043                 /* Sorry, we do not yet support RDMA over 4.1: */
3044                 *p++ = cpu_to_be32(0);
3045         }
3046         return nfserr;
3047 }
3048
3049 static __be32
3050 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3051 {
3052         struct xdr_stream *xdr = &resp->xdr;
3053
3054         if (!nfserr)
3055                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3056
3057         return nfserr;
3058 }
3059
3060
3061 static __be32
3062 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3063 {
3064         struct xdr_stream *xdr = &resp->xdr;
3065         __be32 *p;
3066
3067         if (!nfserr) {
3068                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3069                 if (!p)
3070                         return nfserr_resource;
3071                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3072                                                 NFS4_VERIFIER_SIZE);
3073         }
3074         return nfserr;
3075 }
3076
3077 static __be32
3078 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3079 {
3080         struct xdr_stream *xdr = &resp->xdr;
3081         __be32 *p;
3082
3083         if (!nfserr) {
3084                 p = xdr_reserve_space(xdr, 20);
3085                 if (!p)
3086                         return nfserr_resource;
3087                 encode_cinfo(p, &create->cr_cinfo);
3088                 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3089                                 create->cr_bmval[1], create->cr_bmval[2]);
3090         }
3091         return nfserr;
3092 }
3093
3094 static __be32
3095 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3096 {
3097         struct svc_fh *fhp = getattr->ga_fhp;
3098         struct xdr_stream *xdr = &resp->xdr;
3099
3100         if (nfserr)
3101                 return nfserr;
3102
3103         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3104                                     getattr->ga_bmval,
3105                                     resp->rqstp, 0);
3106         return nfserr;
3107 }
3108
3109 static __be32
3110 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3111 {
3112         struct xdr_stream *xdr = &resp->xdr;
3113         struct svc_fh *fhp = *fhpp;
3114         unsigned int len;
3115         __be32 *p;
3116
3117         if (!nfserr) {
3118                 len = fhp->fh_handle.fh_size;
3119                 p = xdr_reserve_space(xdr, len + 4);
3120                 if (!p)
3121                         return nfserr_resource;
3122                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3123         }
3124         return nfserr;
3125 }
3126
3127 /*
3128 * Including all fields other than the name, a LOCK4denied structure requires
3129 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3130 */
3131 static __be32
3132 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3133 {
3134         struct xdr_netobj *conf = &ld->ld_owner;
3135         __be32 *p;
3136
3137 again:
3138         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3139         if (!p) {
3140                 /*
3141                  * Don't fail to return the result just because we can't
3142                  * return the conflicting open:
3143                  */
3144                 if (conf->len) {
3145                         kfree(conf->data);
3146                         conf->len = 0;
3147                         conf->data = NULL;
3148                         goto again;
3149                 }
3150                 return nfserr_resource;
3151         }
3152         p = xdr_encode_hyper(p, ld->ld_start);
3153         p = xdr_encode_hyper(p, ld->ld_length);
3154         *p++ = cpu_to_be32(ld->ld_type);
3155         if (conf->len) {
3156                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3157                 p = xdr_encode_opaque(p, conf->data, conf->len);
3158                 kfree(conf->data);
3159         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3160                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3161                 *p++ = cpu_to_be32(0); /* length of owner name */
3162         }
3163         return nfserr_denied;
3164 }
3165
3166 static __be32
3167 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3168 {
3169         struct xdr_stream *xdr = &resp->xdr;
3170
3171         if (!nfserr)
3172                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3173         else if (nfserr == nfserr_denied)
3174                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3175
3176         return nfserr;
3177 }
3178
3179 static __be32
3180 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3181 {
3182         struct xdr_stream *xdr = &resp->xdr;
3183
3184         if (nfserr == nfserr_denied)
3185                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3186         return nfserr;
3187 }
3188
3189 static __be32
3190 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3191 {
3192         struct xdr_stream *xdr = &resp->xdr;
3193
3194         if (!nfserr)
3195                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3196
3197         return nfserr;
3198 }
3199
3200
3201 static __be32
3202 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3203 {
3204         struct xdr_stream *xdr = &resp->xdr;
3205         __be32 *p;
3206
3207         if (!nfserr) {
3208                 p = xdr_reserve_space(xdr, 20);
3209                 if (!p)
3210                         return nfserr_resource;
3211                 p = encode_cinfo(p, &link->li_cinfo);
3212         }
3213         return nfserr;
3214 }
3215
3216
3217 static __be32
3218 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3219 {
3220         struct xdr_stream *xdr = &resp->xdr;
3221         __be32 *p;
3222
3223         if (nfserr)
3224                 goto out;
3225
3226         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3227         if (nfserr)
3228                 goto out;
3229         p = xdr_reserve_space(xdr, 24);
3230         if (!p)
3231                 return nfserr_resource;
3232         p = encode_cinfo(p, &open->op_cinfo);
3233         *p++ = cpu_to_be32(open->op_rflags);
3234
3235         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3236                                         open->op_bmval[2]);
3237         if (nfserr)
3238                 goto out;
3239
3240         p = xdr_reserve_space(xdr, 4);
3241         if (!p)
3242                 return nfserr_resource;
3243
3244         *p++ = cpu_to_be32(open->op_delegate_type);
3245         switch (open->op_delegate_type) {
3246         case NFS4_OPEN_DELEGATE_NONE:
3247                 break;
3248         case NFS4_OPEN_DELEGATE_READ:
3249                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3250                 if (nfserr)
3251                         return nfserr;
3252                 p = xdr_reserve_space(xdr, 20);
3253                 if (!p)
3254                         return nfserr_resource;
3255                 *p++ = cpu_to_be32(open->op_recall);
3256
3257                 /*
3258                  * TODO: ACE's in delegations
3259                  */
3260                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3261                 *p++ = cpu_to_be32(0);
3262                 *p++ = cpu_to_be32(0);
3263                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3264                 break;
3265         case NFS4_OPEN_DELEGATE_WRITE:
3266                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3267                 if (nfserr)
3268                         return nfserr;
3269                 p = xdr_reserve_space(xdr, 32);
3270                 if (!p)
3271                         return nfserr_resource;
3272                 *p++ = cpu_to_be32(0);
3273
3274                 /*
3275                  * TODO: space_limit's in delegations
3276                  */
3277                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3278                 *p++ = cpu_to_be32(~(u32)0);
3279                 *p++ = cpu_to_be32(~(u32)0);
3280
3281                 /*
3282                  * TODO: ACE's in delegations
3283                  */
3284                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3285                 *p++ = cpu_to_be32(0);
3286                 *p++ = cpu_to_be32(0);
3287                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3288                 break;
3289         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3290                 switch (open->op_why_no_deleg) {
3291                 case WND4_CONTENTION:
3292                 case WND4_RESOURCE:
3293                         p = xdr_reserve_space(xdr, 8);
3294                         if (!p)
3295                                 return nfserr_resource;
3296                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3297                         /* deleg signaling not supported yet: */
3298                         *p++ = cpu_to_be32(0);
3299                         break;
3300                 default:
3301                         p = xdr_reserve_space(xdr, 4);
3302                         if (!p)
3303                                 return nfserr_resource;
3304                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3305                 }
3306                 break;
3307         default:
3308                 BUG();
3309         }
3310         /* XXX save filehandle here */
3311 out:
3312         return nfserr;
3313 }
3314
3315 static __be32
3316 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3317 {
3318         struct xdr_stream *xdr = &resp->xdr;
3319
3320         if (!nfserr)
3321                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3322
3323         return nfserr;
3324 }
3325
3326 static __be32
3327 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3328 {
3329         struct xdr_stream *xdr = &resp->xdr;
3330
3331         if (!nfserr)
3332                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3333
3334         return nfserr;
3335 }
3336
3337 static __be32 nfsd4_encode_splice_read(
3338                                 struct nfsd4_compoundres *resp,
3339                                 struct nfsd4_read *read,
3340                                 struct file *file, unsigned long maxcount)
3341 {
3342         struct xdr_stream *xdr = &resp->xdr;
3343         struct xdr_buf *buf = xdr->buf;
3344         u32 eof;
3345         int space_left;
3346         __be32 nfserr;
3347         __be32 *p = xdr->p - 2;
3348
3349         /* Make sure there will be room for padding if needed */
3350         if (xdr->end - xdr->p < 1)
3351                 return nfserr_resource;
3352
3353         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3354                                   read->rd_offset, &maxcount);
3355         if (nfserr) {
3356                 /*
3357                  * nfsd_splice_actor may have already messed with the
3358                  * page length; reset it so as not to confuse
3359                  * xdr_truncate_encode:
3360                  */
3361                 buf->page_len = 0;
3362                 return nfserr;
3363         }
3364
3365         eof = (read->rd_offset + maxcount >=
3366                d_inode(read->rd_fhp->fh_dentry)->i_size);
3367
3368         *(p++) = htonl(eof);
3369         *(p++) = htonl(maxcount);
3370
3371         buf->page_len = maxcount;
3372         buf->len += maxcount;
3373         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3374                                                         / PAGE_SIZE;
3375
3376         /* Use rest of head for padding and remaining ops: */
3377         buf->tail[0].iov_base = xdr->p;
3378         buf->tail[0].iov_len = 0;
3379         xdr->iov = buf->tail;
3380         if (maxcount&3) {
3381                 int pad = 4 - (maxcount&3);
3382
3383                 *(xdr->p++) = 0;
3384
3385                 buf->tail[0].iov_base += maxcount&3;
3386                 buf->tail[0].iov_len = pad;
3387                 buf->len += pad;
3388         }
3389
3390         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3391                                 buf->buflen - buf->len);
3392         buf->buflen = buf->len + space_left;
3393         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3394
3395         return 0;
3396 }
3397
3398 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3399                                  struct nfsd4_read *read,
3400                                  struct file *file, unsigned long maxcount)
3401 {
3402         struct xdr_stream *xdr = &resp->xdr;
3403         u32 eof;
3404         int v;
3405         int starting_len = xdr->buf->len - 8;
3406         long len;
3407         int thislen;
3408         __be32 nfserr;
3409         __be32 tmp;
3410         __be32 *p;
3411         u32 zzz = 0;
3412         int pad;
3413
3414         len = maxcount;
3415         v = 0;
3416
3417         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3418         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3419         WARN_ON_ONCE(!p);
3420         resp->rqstp->rq_vec[v].iov_base = p;
3421         resp->rqstp->rq_vec[v].iov_len = thislen;
3422         v++;
3423         len -= thislen;
3424
3425         while (len) {
3426                 thislen = min_t(long, len, PAGE_SIZE);
3427                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3428                 WARN_ON_ONCE(!p);
3429                 resp->rqstp->rq_vec[v].iov_base = p;
3430                 resp->rqstp->rq_vec[v].iov_len = thislen;
3431                 v++;
3432                 len -= thislen;
3433         }
3434         read->rd_vlen = v;
3435
3436         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3437                         read->rd_vlen, &maxcount);
3438         if (nfserr)
3439                 return nfserr;
3440         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3441
3442         eof = (read->rd_offset + maxcount >=
3443                d_inode(read->rd_fhp->fh_dentry)->i_size);
3444
3445         tmp = htonl(eof);
3446         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3447         tmp = htonl(maxcount);
3448         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3449
3450         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3451         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3452                                                                 &zzz, pad);
3453         return 0;
3454
3455 }
3456
3457 static __be32
3458 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3459                   struct nfsd4_read *read)
3460 {
3461         unsigned long maxcount;
3462         struct xdr_stream *xdr = &resp->xdr;
3463         struct file *file = read->rd_filp;
3464         int starting_len = xdr->buf->len;
3465         struct raparms *ra = NULL;
3466         __be32 *p;
3467
3468         if (nfserr)
3469                 goto out;
3470
3471         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3472         if (!p) {
3473                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3474                 nfserr = nfserr_resource;
3475                 goto out;
3476         }
3477         if (resp->xdr.buf->page_len &&
3478             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3479                 WARN_ON_ONCE(1);
3480                 nfserr = nfserr_resource;
3481                 goto out;
3482         }
3483         xdr_commit_encode(xdr);
3484
3485         maxcount = svc_max_payload(resp->rqstp);
3486         maxcount = min_t(unsigned long, maxcount,
3487                          (xdr->buf->buflen - xdr->buf->len));
3488         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3489
3490         if (read->rd_tmp_file)
3491                 ra = nfsd_init_raparms(file);
3492
3493         if (file->f_op->splice_read &&
3494             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3495                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3496         else
3497                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3498
3499         if (ra)
3500                 nfsd_put_raparams(file, ra);
3501
3502         if (nfserr)
3503                 xdr_truncate_encode(xdr, starting_len);
3504
3505 out:
3506         if (file)
3507                 fput(file);
3508         return nfserr;
3509 }
3510
3511 static __be32
3512 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3513 {
3514         int maxcount;
3515         __be32 wire_count;
3516         int zero = 0;
3517         struct xdr_stream *xdr = &resp->xdr;
3518         int length_offset = xdr->buf->len;
3519         __be32 *p;
3520
3521         if (nfserr)
3522                 return nfserr;
3523
3524         p = xdr_reserve_space(xdr, 4);
3525         if (!p)
3526                 return nfserr_resource;
3527         maxcount = PAGE_SIZE;
3528
3529         p = xdr_reserve_space(xdr, maxcount);
3530         if (!p)
3531                 return nfserr_resource;
3532         /*
3533          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3534          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3535          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3536          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3537          */
3538         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3539                                                 (char *)p, &maxcount);
3540         if (nfserr == nfserr_isdir)
3541                 nfserr = nfserr_inval;
3542         if (nfserr) {
3543                 xdr_truncate_encode(xdr, length_offset);
3544                 return nfserr;
3545         }
3546
3547         wire_count = htonl(maxcount);
3548         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3549         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3550         if (maxcount & 3)
3551                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3552                                                 &zero, 4 - (maxcount&3));
3553         return 0;
3554 }
3555
3556 static __be32
3557 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3558 {
3559         int maxcount;
3560         int bytes_left;
3561         loff_t offset;
3562         __be64 wire_offset;
3563         struct xdr_stream *xdr = &resp->xdr;
3564         int starting_len = xdr->buf->len;
3565         __be32 *p;
3566
3567         if (nfserr)
3568                 return nfserr;
3569
3570         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3571         if (!p)
3572                 return nfserr_resource;
3573
3574         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3575         *p++ = cpu_to_be32(0);
3576         *p++ = cpu_to_be32(0);
3577         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3578                                 - (char *)resp->xdr.buf->head[0].iov_base;
3579
3580         /*
3581          * Number of bytes left for directory entries allowing for the
3582          * final 8 bytes of the readdir and a following failed op:
3583          */
3584         bytes_left = xdr->buf->buflen - xdr->buf->len
3585                         - COMPOUND_ERR_SLACK_SPACE - 8;
3586         if (bytes_left < 0) {
3587                 nfserr = nfserr_resource;
3588                 goto err_no_verf;
3589         }
3590         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3591         /*
3592          * Note the rfc defines rd_maxcount as the size of the
3593          * READDIR4resok structure, which includes the verifier above
3594          * and the 8 bytes encoded at the end of this function:
3595          */
3596         if (maxcount < 16) {
3597                 nfserr = nfserr_toosmall;
3598                 goto err_no_verf;
3599         }
3600         maxcount = min_t(int, maxcount-16, bytes_left);
3601
3602         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3603         if (!readdir->rd_dircount)
3604                 readdir->rd_dircount = INT_MAX;
3605
3606         readdir->xdr = xdr;
3607         readdir->rd_maxcount = maxcount;
3608         readdir->common.err = 0;
3609         readdir->cookie_offset = 0;
3610
3611         offset = readdir->rd_cookie;
3612         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3613                               &offset,
3614                               &readdir->common, nfsd4_encode_dirent);
3615         if (nfserr == nfs_ok &&
3616             readdir->common.err == nfserr_toosmall &&
3617             xdr->buf->len == starting_len + 8) {
3618                 /* nothing encoded; which limit did we hit?: */
3619                 if (maxcount - 16 < bytes_left)
3620                         /* It was the fault of rd_maxcount: */
3621                         nfserr = nfserr_toosmall;
3622                 else
3623                         /* We ran out of buffer space: */
3624                         nfserr = nfserr_resource;
3625         }
3626         if (nfserr)
3627                 goto err_no_verf;
3628
3629         if (readdir->cookie_offset) {
3630                 wire_offset = cpu_to_be64(offset);
3631                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3632                                                         &wire_offset, 8);
3633         }
3634
3635         p = xdr_reserve_space(xdr, 8);
3636         if (!p) {
3637                 WARN_ON_ONCE(1);
3638                 goto err_no_verf;
3639         }
3640         *p++ = 0;       /* no more entries */
3641         *p++ = htonl(readdir->common.err == nfserr_eof);
3642
3643         return 0;
3644 err_no_verf:
3645         xdr_truncate_encode(xdr, starting_len);
3646         return nfserr;
3647 }
3648
3649 static __be32
3650 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3651 {
3652         struct xdr_stream *xdr = &resp->xdr;
3653         __be32 *p;
3654
3655         if (!nfserr) {
3656                 p = xdr_reserve_space(xdr, 20);
3657                 if (!p)
3658                         return nfserr_resource;
3659                 p = encode_cinfo(p, &remove->rm_cinfo);
3660         }
3661         return nfserr;
3662 }
3663
3664 static __be32
3665 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3666 {
3667         struct xdr_stream *xdr = &resp->xdr;
3668         __be32 *p;
3669
3670         if (!nfserr) {
3671                 p = xdr_reserve_space(xdr, 40);
3672                 if (!p)
3673                         return nfserr_resource;
3674                 p = encode_cinfo(p, &rename->rn_sinfo);
3675                 p = encode_cinfo(p, &rename->rn_tinfo);
3676         }
3677         return nfserr;
3678 }
3679
3680 static __be32
3681 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3682                          __be32 nfserr, struct svc_export *exp)
3683 {
3684         u32 i, nflavs, supported;
3685         struct exp_flavor_info *flavs;
3686         struct exp_flavor_info def_flavs[2];
3687         __be32 *p, *flavorsp;
3688         static bool report = true;
3689
3690         if (nfserr)
3691                 goto out;
3692         nfserr = nfserr_resource;
3693         if (exp->ex_nflavors) {
3694                 flavs = exp->ex_flavors;
3695                 nflavs = exp->ex_nflavors;
3696         } else { /* Handling of some defaults in absence of real secinfo: */
3697                 flavs = def_flavs;
3698                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3699                         nflavs = 2;
3700                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3701                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3702                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3703                         nflavs = 1;
3704                         flavs[0].pseudoflavor
3705                                         = svcauth_gss_flavor(exp->ex_client);
3706                 } else {
3707                         nflavs = 1;
3708                         flavs[0].pseudoflavor
3709                                         = exp->ex_client->flavour->flavour;
3710                 }
3711         }
3712
3713         supported = 0;
3714         p = xdr_reserve_space(xdr, 4);
3715         if (!p)
3716                 goto out;
3717         flavorsp = p++;         /* to be backfilled later */
3718
3719         for (i = 0; i < nflavs; i++) {
3720                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3721                 struct rpcsec_gss_info info;
3722
3723                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3724                         supported++;
3725                         p = xdr_reserve_space(xdr, 4 + 4 +
3726                                               XDR_LEN(info.oid.len) + 4 + 4);
3727                         if (!p)
3728                                 goto out;
3729                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3730                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3731                         *p++ = cpu_to_be32(info.qop);
3732                         *p++ = cpu_to_be32(info.service);
3733                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3734                         supported++;
3735                         p = xdr_reserve_space(xdr, 4);
3736                         if (!p)
3737                                 goto out;
3738                         *p++ = cpu_to_be32(pf);
3739                 } else {
3740                         if (report)
3741                                 pr_warn("NFS: SECINFO: security flavor %u "
3742                                         "is not supported\n", pf);
3743                 }
3744         }
3745
3746         if (nflavs != supported)
3747                 report = false;
3748         *flavorsp = htonl(supported);
3749         nfserr = 0;
3750 out:
3751         if (exp)
3752                 exp_put(exp);
3753         return nfserr;
3754 }
3755
3756 static __be32
3757 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3758                      struct nfsd4_secinfo *secinfo)
3759 {
3760         struct xdr_stream *xdr = &resp->xdr;
3761
3762         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3763 }
3764
3765 static __be32
3766 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3767                      struct nfsd4_secinfo_no_name *secinfo)
3768 {
3769         struct xdr_stream *xdr = &resp->xdr;
3770
3771         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3772 }
3773
3774 /*
3775  * The SETATTR encode routine is special -- it always encodes a bitmap,
3776  * regardless of the error status.
3777  */
3778 static __be32
3779 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3780 {
3781         struct xdr_stream *xdr = &resp->xdr;
3782         __be32 *p;
3783
3784         p = xdr_reserve_space(xdr, 16);
3785         if (!p)
3786                 return nfserr_resource;
3787         if (nfserr) {
3788                 *p++ = cpu_to_be32(3);
3789                 *p++ = cpu_to_be32(0);
3790                 *p++ = cpu_to_be32(0);
3791                 *p++ = cpu_to_be32(0);
3792         }
3793         else {
3794                 *p++ = cpu_to_be32(3);
3795                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3796                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3797                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3798         }
3799         return nfserr;
3800 }
3801
3802 static __be32
3803 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3804 {
3805         struct xdr_stream *xdr = &resp->xdr;
3806         __be32 *p;
3807
3808         if (!nfserr) {
3809                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3810                 if (!p)
3811                         return nfserr_resource;
3812                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3813                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3814                                                 NFS4_VERIFIER_SIZE);
3815         }
3816         else if (nfserr == nfserr_clid_inuse) {
3817                 p = xdr_reserve_space(xdr, 8);
3818                 if (!p)
3819                         return nfserr_resource;
3820                 *p++ = cpu_to_be32(0);
3821                 *p++ = cpu_to_be32(0);
3822         }
3823         return nfserr;
3824 }
3825
3826 static __be32
3827 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3828 {
3829         struct xdr_stream *xdr = &resp->xdr;
3830         __be32 *p;
3831
3832         if (!nfserr) {
3833                 p = xdr_reserve_space(xdr, 16);
3834                 if (!p)
3835                         return nfserr_resource;
3836                 *p++ = cpu_to_be32(write->wr_bytes_written);
3837                 *p++ = cpu_to_be32(write->wr_how_written);
3838                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3839                                                         NFS4_VERIFIER_SIZE);
3840         }
3841         return nfserr;
3842 }
3843
3844 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3845         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3846               1 << (OP_EXCHANGE_ID - 32) |
3847               1 << (OP_CREATE_SESSION - 32) |
3848               1 << (OP_DESTROY_SESSION - 32) |
3849               1 << (OP_DESTROY_CLIENTID - 32)
3850 };
3851
3852 static __be32
3853 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3854                          struct nfsd4_exchange_id *exid)
3855 {
3856         struct xdr_stream *xdr = &resp->xdr;
3857         __be32 *p;
3858         char *major_id;
3859         char *server_scope;
3860         int major_id_sz;
3861         int server_scope_sz;
3862         uint64_t minor_id = 0;
3863
3864         if (nfserr)
3865                 return nfserr;
3866
3867         major_id = utsname()->nodename;
3868         major_id_sz = strlen(major_id);
3869         server_scope = utsname()->nodename;
3870         server_scope_sz = strlen(server_scope);
3871
3872         p = xdr_reserve_space(xdr,
3873                 8 /* eir_clientid */ +
3874                 4 /* eir_sequenceid */ +
3875                 4 /* eir_flags */ +
3876                 4 /* spr_how */);
3877         if (!p)
3878                 return nfserr_resource;
3879
3880         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3881         *p++ = cpu_to_be32(exid->seqid);
3882         *p++ = cpu_to_be32(exid->flags);
3883
3884         *p++ = cpu_to_be32(exid->spa_how);
3885
3886         switch (exid->spa_how) {
3887         case SP4_NONE:
3888                 break;
3889         case SP4_MACH_CRED:
3890                 /* spo_must_enforce, spo_must_allow */
3891                 p = xdr_reserve_space(xdr, 16);
3892                 if (!p)
3893                         return nfserr_resource;
3894
3895                 /* spo_must_enforce bitmap: */
3896                 *p++ = cpu_to_be32(2);
3897                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3898                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3899                 /* empty spo_must_allow bitmap: */
3900                 *p++ = cpu_to_be32(0);
3901
3902                 break;
3903         default:
3904                 WARN_ON_ONCE(1);
3905         }
3906
3907         p = xdr_reserve_space(xdr,
3908                 8 /* so_minor_id */ +
3909                 4 /* so_major_id.len */ +
3910                 (XDR_QUADLEN(major_id_sz) * 4) +
3911                 4 /* eir_server_scope.len */ +
3912                 (XDR_QUADLEN(server_scope_sz) * 4) +
3913                 4 /* eir_server_impl_id.count (0) */);
3914         if (!p)
3915                 return nfserr_resource;
3916
3917         /* The server_owner struct */
3918         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3919         /* major id */
3920         p = xdr_encode_opaque(p, major_id, major_id_sz);
3921
3922         /* Server scope */
3923         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3924
3925         /* Implementation id */
3926         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3927         return 0;
3928 }
3929
3930 static __be32
3931 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3932                             struct nfsd4_create_session *sess)
3933 {
3934         struct xdr_stream *xdr = &resp->xdr;
3935         __be32 *p;
3936
3937         if (nfserr)
3938                 return nfserr;
3939
3940         p = xdr_reserve_space(xdr, 24);
3941         if (!p)
3942                 return nfserr_resource;
3943         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3944                                         NFS4_MAX_SESSIONID_LEN);
3945         *p++ = cpu_to_be32(sess->seqid);
3946         *p++ = cpu_to_be32(sess->flags);
3947
3948         p = xdr_reserve_space(xdr, 28);
3949         if (!p)
3950                 return nfserr_resource;
3951         *p++ = cpu_to_be32(0); /* headerpadsz */
3952         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3953         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3954         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3955         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3956         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3957         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3958
3959         if (sess->fore_channel.nr_rdma_attrs) {
3960                 p = xdr_reserve_space(xdr, 4);
3961                 if (!p)
3962                         return nfserr_resource;
3963                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3964         }
3965
3966         p = xdr_reserve_space(xdr, 28);
3967         if (!p)
3968                 return nfserr_resource;
3969         *p++ = cpu_to_be32(0); /* headerpadsz */
3970         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3971         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3972         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3973         *p++ = cpu_to_be32(sess->back_channel.maxops);
3974         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3975         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3976
3977         if (sess->back_channel.nr_rdma_attrs) {
3978                 p = xdr_reserve_space(xdr, 4);
3979                 if (!p)
3980                         return nfserr_resource;
3981                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3982         }
3983         return 0;
3984 }
3985
3986 static __be32
3987 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3988                       struct nfsd4_sequence *seq)
3989 {
3990         struct xdr_stream *xdr = &resp->xdr;
3991         __be32 *p;
3992
3993         if (nfserr)
3994                 return nfserr;
3995
3996         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3997         if (!p)
3998                 return nfserr_resource;
3999         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4000                                         NFS4_MAX_SESSIONID_LEN);
4001         *p++ = cpu_to_be32(seq->seqid);
4002         *p++ = cpu_to_be32(seq->slotid);
4003         /* Note slotid's are numbered from zero: */
4004         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4005         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4006         *p++ = cpu_to_be32(seq->status_flags);
4007
4008         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4009         return 0;
4010 }
4011
4012 static __be32
4013 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4014                           struct nfsd4_test_stateid *test_stateid)
4015 {
4016         struct xdr_stream *xdr = &resp->xdr;
4017         struct nfsd4_test_stateid_id *stateid, *next;
4018         __be32 *p;
4019
4020         if (nfserr)
4021                 return nfserr;
4022
4023         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4024         if (!p)
4025                 return nfserr_resource;
4026         *p++ = htonl(test_stateid->ts_num_ids);
4027
4028         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4029                 *p++ = stateid->ts_id_status;
4030         }
4031
4032         return nfserr;
4033 }
4034
4035 #ifdef CONFIG_NFSD_PNFS
4036 static __be32
4037 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4038                 struct nfsd4_getdeviceinfo *gdev)
4039 {
4040         struct xdr_stream *xdr = &resp->xdr;
4041         const struct nfsd4_layout_ops *ops =
4042                 nfsd4_layout_ops[gdev->gd_layout_type];
4043         u32 starting_len = xdr->buf->len, needed_len;
4044         __be32 *p;
4045
4046         dprintk("%s: err %d\n", __func__, nfserr);
4047         if (nfserr)
4048                 goto out;
4049
4050         nfserr = nfserr_resource;
4051         p = xdr_reserve_space(xdr, 4);
4052         if (!p)
4053                 goto out;
4054
4055         *p++ = cpu_to_be32(gdev->gd_layout_type);
4056
4057         /* If maxcount is 0 then just update notifications */
4058         if (gdev->gd_maxcount != 0) {
4059                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4060                 if (nfserr) {
4061                         /*
4062                          * We don't bother to burden the layout drivers with
4063                          * enforcing gd_maxcount, just tell the client to
4064                          * come back with a bigger buffer if it's not enough.
4065                          */
4066                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4067                                 goto toosmall;
4068                         goto out;
4069                 }
4070         }
4071
4072         nfserr = nfserr_resource;
4073         if (gdev->gd_notify_types) {
4074                 p = xdr_reserve_space(xdr, 4 + 4);
4075                 if (!p)
4076                         goto out;
4077                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4078                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4079         } else {
4080                 p = xdr_reserve_space(xdr, 4);
4081                 if (!p)
4082                         goto out;
4083                 *p++ = 0;
4084         }
4085
4086         nfserr = 0;
4087 out:
4088         kfree(gdev->gd_device);
4089         dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4090         return nfserr;
4091
4092 toosmall:
4093         dprintk("%s: maxcount too small\n", __func__);
4094         needed_len = xdr->buf->len + 4 /* notifications */;
4095         xdr_truncate_encode(xdr, starting_len);
4096         p = xdr_reserve_space(xdr, 4);
4097         if (!p) {
4098                 nfserr = nfserr_resource;
4099         } else {
4100                 *p++ = cpu_to_be32(needed_len);
4101                 nfserr = nfserr_toosmall;
4102         }
4103         goto out;
4104 }
4105
4106 static __be32
4107 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4108                 struct nfsd4_layoutget *lgp)
4109 {
4110         struct xdr_stream *xdr = &resp->xdr;
4111         const struct nfsd4_layout_ops *ops =
4112                 nfsd4_layout_ops[lgp->lg_layout_type];
4113         __be32 *p;
4114
4115         dprintk("%s: err %d\n", __func__, nfserr);
4116         if (nfserr)
4117                 goto out;
4118
4119         nfserr = nfserr_resource;
4120         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4121         if (!p)
4122                 goto out;
4123
4124         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4125         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4126         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4127                                     sizeof(stateid_opaque_t));
4128
4129         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4130         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4131         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4132         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4133         *p++ = cpu_to_be32(lgp->lg_layout_type);
4134
4135         nfserr = ops->encode_layoutget(xdr, lgp);
4136 out:
4137         kfree(lgp->lg_content);
4138         return nfserr;
4139 }
4140
4141 static __be32
4142 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4143                           struct nfsd4_layoutcommit *lcp)
4144 {
4145         struct xdr_stream *xdr = &resp->xdr;
4146         __be32 *p;
4147
4148         if (nfserr)
4149                 return nfserr;
4150
4151         p = xdr_reserve_space(xdr, 4);
4152         if (!p)
4153                 return nfserr_resource;
4154         *p++ = cpu_to_be32(lcp->lc_size_chg);
4155         if (lcp->lc_size_chg) {
4156                 p = xdr_reserve_space(xdr, 8);
4157                 if (!p)
4158                         return nfserr_resource;
4159                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4160         }
4161
4162         return nfs_ok;
4163 }
4164
4165 static __be32
4166 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4167                 struct nfsd4_layoutreturn *lrp)
4168 {
4169         struct xdr_stream *xdr = &resp->xdr;
4170         __be32 *p;
4171
4172         if (nfserr)
4173                 return nfserr;
4174
4175         p = xdr_reserve_space(xdr, 4);
4176         if (!p)
4177                 return nfserr_resource;
4178         *p++ = cpu_to_be32(lrp->lrs_present);
4179         if (lrp->lrs_present)
4180                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4181         return nfs_ok;
4182 }
4183 #endif /* CONFIG_NFSD_PNFS */
4184
4185 static __be32
4186 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4187                   struct nfsd4_seek *seek)
4188 {
4189         __be32 *p;
4190
4191         if (nfserr)
4192                 return nfserr;
4193
4194         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4195         *p++ = cpu_to_be32(seek->seek_eof);
4196         p = xdr_encode_hyper(p, seek->seek_pos);
4197
4198         return nfserr;
4199 }
4200
4201 static __be32
4202 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4203 {
4204         return nfserr;
4205 }
4206
4207 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4208
4209 /*
4210  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4211  * since we don't need to filter out obsolete ops as this is
4212  * done in the decoding phase.
4213  */
4214 static nfsd4_enc nfsd4_enc_ops[] = {
4215         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4216         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4217         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4218         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4219         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4220         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4221         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4222         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4223         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4224         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4225         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4226         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4227         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4228         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4229         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4230         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4231         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4232         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4233         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4234         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4235         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4236         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4237         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4238         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4239         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4240         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4241         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4242         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4243         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4244         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4245         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4246         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4247         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4248         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4249         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4250         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4251         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4252
4253         /* NFSv4.1 operations */
4254         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4255         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4256         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4257         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4258         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4259         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4260         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4261 #ifdef CONFIG_NFSD_PNFS
4262         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4263         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4264         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4265         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4266         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4267 #else
4268         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4269         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4270         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4271         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4272         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4273 #endif
4274         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4275         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4276         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4277         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4278         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4279         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4280         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4281
4282         /* NFSv4.2 operations */
4283         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4284         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_noop,
4285         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4286         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4287         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4288         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4289         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4290         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4291         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4292         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4293         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4294         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4295 };
4296
4297 /*
4298  * Calculate whether we still have space to encode repsize bytes.
4299  * There are two considerations:
4300  *     - For NFS versions >=4.1, the size of the reply must stay within
4301  *       session limits
4302  *     - For all NFS versions, we must stay within limited preallocated
4303  *       buffer space.
4304  *
4305  * This is called before the operation is processed, so can only provide
4306  * an upper estimate.  For some nonidempotent operations (such as
4307  * getattr), it's not necessarily a problem if that estimate is wrong,
4308  * as we can fail it after processing without significant side effects.
4309  */
4310 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4311 {
4312         struct xdr_buf *buf = &resp->rqstp->rq_res;
4313         struct nfsd4_slot *slot = resp->cstate.slot;
4314
4315         if (buf->len + respsize <= buf->buflen)
4316                 return nfs_ok;
4317         if (!nfsd4_has_session(&resp->cstate))
4318                 return nfserr_resource;
4319         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4320                 WARN_ON_ONCE(1);
4321                 return nfserr_rep_too_big_to_cache;
4322         }
4323         return nfserr_rep_too_big;
4324 }
4325
4326 void
4327 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4328 {
4329         struct xdr_stream *xdr = &resp->xdr;
4330         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4331         struct svc_rqst *rqstp = resp->rqstp;
4332         int post_err_offset;
4333         nfsd4_enc encoder;
4334         __be32 *p;
4335
4336         p = xdr_reserve_space(xdr, 8);
4337         if (!p) {
4338                 WARN_ON_ONCE(1);
4339                 return;
4340         }
4341         *p++ = cpu_to_be32(op->opnum);
4342         post_err_offset = xdr->buf->len;
4343
4344         if (op->opnum == OP_ILLEGAL)
4345                 goto status;
4346         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4347                !nfsd4_enc_ops[op->opnum]);
4348         encoder = nfsd4_enc_ops[op->opnum];
4349         op->status = encoder(resp, op->status, &op->u);
4350         xdr_commit_encode(xdr);
4351
4352         /* nfsd4_check_resp_size guarantees enough room for error status */
4353         if (!op->status) {
4354                 int space_needed = 0;
4355                 if (!nfsd4_last_compound_op(rqstp))
4356                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4357                 op->status = nfsd4_check_resp_size(resp, space_needed);
4358         }
4359         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4360                 struct nfsd4_slot *slot = resp->cstate.slot;
4361
4362                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4363                         op->status = nfserr_rep_too_big_to_cache;
4364                 else
4365                         op->status = nfserr_rep_too_big;
4366         }
4367         if (op->status == nfserr_resource ||
4368             op->status == nfserr_rep_too_big ||
4369             op->status == nfserr_rep_too_big_to_cache) {
4370                 /*
4371                  * The operation may have already been encoded or
4372                  * partially encoded.  No op returns anything additional
4373                  * in the case of one of these three errors, so we can
4374                  * just truncate back to after the status.  But it's a
4375                  * bug if we had to do this on a non-idempotent op:
4376                  */
4377                 warn_on_nonidempotent_op(op);
4378                 xdr_truncate_encode(xdr, post_err_offset);
4379         }
4380         if (so) {
4381                 int len = xdr->buf->len - post_err_offset;
4382
4383                 so->so_replay.rp_status = op->status;
4384                 so->so_replay.rp_buflen = len;
4385                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4386                                                 so->so_replay.rp_buf, len);
4387         }
4388 status:
4389         /* Note that op->status is already in network byte order: */
4390         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4391 }
4392
4393 /*
4394  * Encode the reply stored in the stateowner reply cache
4395  *
4396  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4397  * previously sent already encoded operation.
4398  */
4399 void
4400 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4401 {
4402         __be32 *p;
4403         struct nfs4_replay *rp = op->replay;
4404
4405         BUG_ON(!rp);
4406
4407         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4408         if (!p) {
4409                 WARN_ON_ONCE(1);
4410                 return;
4411         }
4412         *p++ = cpu_to_be32(op->opnum);
4413         *p++ = rp->rp_status;  /* already xdr'ed */
4414
4415         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4416 }
4417
4418 int
4419 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4420 {
4421         return xdr_ressize_check(rqstp, p);
4422 }
4423
4424 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4425 {
4426         struct svc_rqst *rqstp = rq;
4427         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4428
4429         if (args->ops != args->iops) {
4430                 kfree(args->ops);
4431                 args->ops = args->iops;
4432         }
4433         kfree(args->tmpp);
4434         args->tmpp = NULL;
4435         while (args->to_free) {
4436                 struct svcxdr_tmpbuf *tb = args->to_free;
4437                 args->to_free = tb->next;
4438                 kfree(tb);
4439         }
4440         return 1;
4441 }
4442
4443 int
4444 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4445 {
4446         if (rqstp->rq_arg.head[0].iov_len % 4) {
4447                 /* client is nuts */
4448                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4449                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4450                 return 0;
4451         }
4452         args->p = p;
4453         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4454         args->pagelist = rqstp->rq_arg.pages;
4455         args->pagelen = rqstp->rq_arg.page_len;
4456         args->tmpp = NULL;
4457         args->to_free = NULL;
4458         args->ops = args->iops;
4459         args->rqstp = rqstp;
4460
4461         return !nfsd4_decode_compound(args);
4462 }
4463
4464 int
4465 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4466 {
4467         /*
4468          * All that remains is to write the tag and operation count...
4469          */
4470         struct xdr_buf *buf = resp->xdr.buf;
4471
4472         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4473                                  buf->tail[0].iov_len);
4474
4475         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4476
4477         p = resp->tagp;
4478         *p++ = htonl(resp->taglen);
4479         memcpy(p, resp->tag, resp->taglen);
4480         p += XDR_QUADLEN(resp->taglen);
4481         *p++ = htonl(resp->opcnt);
4482
4483         nfsd4_sequence_done(resp);
4484         return 1;
4485 }
4486
4487 /*
4488  * Local variables:
4489  *  c-basic-offset: 8
4490  * End:
4491  */