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_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1679 {
1680         DECODE_HEAD;
1681
1682         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1683         if (status)
1684                 return status;
1685         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1686         if (status)
1687                 return status;
1688
1689         READ_BUF(8 + 8 + 8);
1690         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1691         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1692         p = xdr_decode_hyper(p, &clone->cl_count);
1693         DECODE_TAIL;
1694 }
1695
1696 static __be32
1697 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1698 {
1699         DECODE_HEAD;
1700
1701         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1702         if (status)
1703                 return status;
1704
1705         READ_BUF(8 + 4);
1706         p = xdr_decode_hyper(p, &seek->seek_offset);
1707         seek->seek_whence = be32_to_cpup(p);
1708
1709         DECODE_TAIL;
1710 }
1711
1712 static __be32
1713 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1714 {
1715         return nfs_ok;
1716 }
1717
1718 static __be32
1719 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1720 {
1721         return nfserr_notsupp;
1722 }
1723
1724 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1725
1726 static nfsd4_dec nfsd4_dec_ops[] = {
1727         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1728         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1729         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1730         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1731         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1732         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1733         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1734         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1735         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1736         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1737         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1738         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1739         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1740         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1741         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1742         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1743         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1744         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1745         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1746         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1747         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1748         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1749         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1750         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1751         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1752         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1753         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1754         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1755         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1756         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1757         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1758         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1759         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1760         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1761         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1762         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1763         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1764
1765         /* new operations for NFSv4.1 */
1766         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1767         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1768         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1769         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1770         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1771         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1772         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1773 #ifdef CONFIG_NFSD_PNFS
1774         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1775         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1776         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1777         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1778         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1779 #else
1780         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1781         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1782         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1783         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1784         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1785 #endif
1786         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1787         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1788         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1789         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1790         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1791         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1792         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1793
1794         /* new operations for NFSv4.2 */
1795         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1796         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_notsupp,
1797         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1798         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1799         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1800         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1801         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1802         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1803         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1804         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1805         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1806         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1807         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1808 };
1809
1810 static inline bool
1811 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1812 {
1813         if (op->opnum < FIRST_NFS4_OP)
1814                 return false;
1815         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1816                 return false;
1817         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1818                 return false;
1819         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1820                 return false;
1821         return true;
1822 }
1823
1824 static __be32
1825 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1826 {
1827         DECODE_HEAD;
1828         struct nfsd4_op *op;
1829         bool cachethis = false;
1830         int auth_slack= argp->rqstp->rq_auth_slack;
1831         int max_reply = auth_slack + 8; /* opcnt, status */
1832         int readcount = 0;
1833         int readbytes = 0;
1834         int i;
1835
1836         READ_BUF(4);
1837         argp->taglen = be32_to_cpup(p++);
1838         READ_BUF(argp->taglen + 8);
1839         SAVEMEM(argp->tag, argp->taglen);
1840         argp->minorversion = be32_to_cpup(p++);
1841         argp->opcnt = be32_to_cpup(p++);
1842         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1843
1844         if (argp->taglen > NFSD4_MAX_TAGLEN)
1845                 goto xdr_error;
1846         if (argp->opcnt > 100)
1847                 goto xdr_error;
1848
1849         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1850                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1851                 if (!argp->ops) {
1852                         argp->ops = argp->iops;
1853                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1854                         goto xdr_error;
1855                 }
1856         }
1857
1858         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1859                 argp->opcnt = 0;
1860
1861         for (i = 0; i < argp->opcnt; i++) {
1862                 op = &argp->ops[i];
1863                 op->replay = NULL;
1864
1865                 READ_BUF(4);
1866                 op->opnum = be32_to_cpup(p++);
1867
1868                 if (nfsd4_opnum_in_range(argp, op))
1869                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1870                 else {
1871                         op->opnum = OP_ILLEGAL;
1872                         op->status = nfserr_op_illegal;
1873                 }
1874                 /*
1875                  * We'll try to cache the result in the DRC if any one
1876                  * op in the compound wants to be cached:
1877                  */
1878                 cachethis |= nfsd4_cache_this_op(op);
1879
1880                 if (op->opnum == OP_READ) {
1881                         readcount++;
1882                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1883                 } else
1884                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1885                 /*
1886                  * OP_LOCK may return a conflicting lock.  (Special case
1887                  * because it will just skip encoding this if it runs
1888                  * out of xdr buffer space, and it is the only operation
1889                  * that behaves this way.)
1890                  */
1891                 if (op->opnum == OP_LOCK)
1892                         max_reply += NFS4_OPAQUE_LIMIT;
1893
1894                 if (op->status) {
1895                         argp->opcnt = i+1;
1896                         break;
1897                 }
1898         }
1899         /* Sessions make the DRC unnecessary: */
1900         if (argp->minorversion)
1901                 cachethis = false;
1902         svc_reserve(argp->rqstp, max_reply + readbytes);
1903         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1904
1905         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1906                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1907
1908         DECODE_TAIL;
1909 }
1910
1911 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1912 {
1913         if (IS_I_VERSION(inode)) {
1914                 p = xdr_encode_hyper(p, inode->i_version);
1915         } else {
1916                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1917                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1918         }
1919         return p;
1920 }
1921
1922 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1923 {
1924         *p++ = cpu_to_be32(c->atomic);
1925         if (c->change_supported) {
1926                 p = xdr_encode_hyper(p, c->before_change);
1927                 p = xdr_encode_hyper(p, c->after_change);
1928         } else {
1929                 *p++ = cpu_to_be32(c->before_ctime_sec);
1930                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1931                 *p++ = cpu_to_be32(c->after_ctime_sec);
1932                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1933         }
1934         return p;
1935 }
1936
1937 /* Encode as an array of strings the string given with components
1938  * separated @sep, escaped with esc_enter and esc_exit.
1939  */
1940 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1941                                           char *components, char esc_enter,
1942                                           char esc_exit)
1943 {
1944         __be32 *p;
1945         __be32 pathlen;
1946         int pathlen_offset;
1947         int strlen, count=0;
1948         char *str, *end, *next;
1949
1950         dprintk("nfsd4_encode_components(%s)\n", components);
1951
1952         pathlen_offset = xdr->buf->len;
1953         p = xdr_reserve_space(xdr, 4);
1954         if (!p)
1955                 return nfserr_resource;
1956         p++; /* We will fill this in with @count later */
1957
1958         end = str = components;
1959         while (*end) {
1960                 bool found_esc = false;
1961
1962                 /* try to parse as esc_start, ..., esc_end, sep */
1963                 if (*str == esc_enter) {
1964                         for (; *end && (*end != esc_exit); end++)
1965                                 /* find esc_exit or end of string */;
1966                         next = end + 1;
1967                         if (*end && (!*next || *next == sep)) {
1968                                 str++;
1969                                 found_esc = true;
1970                         }
1971                 }
1972
1973                 if (!found_esc)
1974                         for (; *end && (*end != sep); end++)
1975                                 /* find sep or end of string */;
1976
1977                 strlen = end - str;
1978                 if (strlen) {
1979                         p = xdr_reserve_space(xdr, strlen + 4);
1980                         if (!p)
1981                                 return nfserr_resource;
1982                         p = xdr_encode_opaque(p, str, strlen);
1983                         count++;
1984                 }
1985                 else
1986                         end++;
1987                 if (found_esc)
1988                         end = next;
1989
1990                 str = end;
1991         }
1992         pathlen = htonl(count);
1993         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1994         return 0;
1995 }
1996
1997 /* Encode as an array of strings the string given with components
1998  * separated @sep.
1999  */
2000 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2001                                       char *components)
2002 {
2003         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2004 }
2005
2006 /*
2007  * encode a location element of a fs_locations structure
2008  */
2009 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2010                                         struct nfsd4_fs_location *location)
2011 {
2012         __be32 status;
2013
2014         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2015                                                 '[', ']');
2016         if (status)
2017                 return status;
2018         status = nfsd4_encode_components(xdr, '/', location->path);
2019         if (status)
2020                 return status;
2021         return 0;
2022 }
2023
2024 /*
2025  * Encode a path in RFC3530 'pathname4' format
2026  */
2027 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2028                                 const struct path *root,
2029                                 const struct path *path)
2030 {
2031         struct path cur = *path;
2032         __be32 *p;
2033         struct dentry **components = NULL;
2034         unsigned int ncomponents = 0;
2035         __be32 err = nfserr_jukebox;
2036
2037         dprintk("nfsd4_encode_components(");
2038
2039         path_get(&cur);
2040         /* First walk the path up to the nfsd root, and store the
2041          * dentries/path components in an array.
2042          */
2043         for (;;) {
2044                 if (path_equal(&cur, root))
2045                         break;
2046                 if (cur.dentry == cur.mnt->mnt_root) {
2047                         if (follow_up(&cur))
2048                                 continue;
2049                         goto out_free;
2050                 }
2051                 if ((ncomponents & 15) == 0) {
2052                         struct dentry **new;
2053                         new = krealloc(components,
2054                                         sizeof(*new) * (ncomponents + 16),
2055                                         GFP_KERNEL);
2056                         if (!new)
2057                                 goto out_free;
2058                         components = new;
2059                 }
2060                 components[ncomponents++] = cur.dentry;
2061                 cur.dentry = dget_parent(cur.dentry);
2062         }
2063         err = nfserr_resource;
2064         p = xdr_reserve_space(xdr, 4);
2065         if (!p)
2066                 goto out_free;
2067         *p++ = cpu_to_be32(ncomponents);
2068
2069         while (ncomponents) {
2070                 struct dentry *dentry = components[ncomponents - 1];
2071                 unsigned int len;
2072
2073                 spin_lock(&dentry->d_lock);
2074                 len = dentry->d_name.len;
2075                 p = xdr_reserve_space(xdr, len + 4);
2076                 if (!p) {
2077                         spin_unlock(&dentry->d_lock);
2078                         goto out_free;
2079                 }
2080                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2081                 dprintk("/%pd", dentry);
2082                 spin_unlock(&dentry->d_lock);
2083                 dput(dentry);
2084                 ncomponents--;
2085         }
2086
2087         err = 0;
2088 out_free:
2089         dprintk(")\n");
2090         while (ncomponents)
2091                 dput(components[--ncomponents]);
2092         kfree(components);
2093         path_put(&cur);
2094         return err;
2095 }
2096
2097 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2098                         struct svc_rqst *rqstp, const struct path *path)
2099 {
2100         struct svc_export *exp_ps;
2101         __be32 res;
2102
2103         exp_ps = rqst_find_fsidzero_export(rqstp);
2104         if (IS_ERR(exp_ps))
2105                 return nfserrno(PTR_ERR(exp_ps));
2106         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2107         exp_put(exp_ps);
2108         return res;
2109 }
2110
2111 /*
2112  *  encode a fs_locations structure
2113  */
2114 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2115                         struct svc_rqst *rqstp, struct svc_export *exp)
2116 {
2117         __be32 status;
2118         int i;
2119         __be32 *p;
2120         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2121
2122         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2123         if (status)
2124                 return status;
2125         p = xdr_reserve_space(xdr, 4);
2126         if (!p)
2127                 return nfserr_resource;
2128         *p++ = cpu_to_be32(fslocs->locations_count);
2129         for (i=0; i<fslocs->locations_count; i++) {
2130                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2131                 if (status)
2132                         return status;
2133         }
2134         return 0;
2135 }
2136
2137 static u32 nfs4_file_type(umode_t mode)
2138 {
2139         switch (mode & S_IFMT) {
2140         case S_IFIFO:   return NF4FIFO;
2141         case S_IFCHR:   return NF4CHR;
2142         case S_IFDIR:   return NF4DIR;
2143         case S_IFBLK:   return NF4BLK;
2144         case S_IFLNK:   return NF4LNK;
2145         case S_IFREG:   return NF4REG;
2146         case S_IFSOCK:  return NF4SOCK;
2147         default:        return NF4BAD;
2148         };
2149 }
2150
2151 static inline __be32
2152 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2153                      struct nfs4_ace *ace)
2154 {
2155         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2156                 return nfs4_acl_write_who(xdr, ace->whotype);
2157         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2158                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2159         else
2160                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2161 }
2162
2163 static inline __be32
2164 nfsd4_encode_layout_type(struct xdr_stream *xdr, enum pnfs_layouttype layout_type)
2165 {
2166         __be32 *p;
2167
2168         if (layout_type) {
2169                 p = xdr_reserve_space(xdr, 8);
2170                 if (!p)
2171                         return nfserr_resource;
2172                 *p++ = cpu_to_be32(1);
2173                 *p++ = cpu_to_be32(layout_type);
2174         } else {
2175                 p = xdr_reserve_space(xdr, 4);
2176                 if (!p)
2177                         return nfserr_resource;
2178                 *p++ = cpu_to_be32(0);
2179         }
2180
2181         return 0;
2182 }
2183
2184 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2185                               FATTR4_WORD0_RDATTR_ERROR)
2186 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2187 #define WORD2_ABSENT_FS_ATTRS 0
2188
2189 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2190 static inline __be32
2191 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2192                             void *context, int len)
2193 {
2194         __be32 *p;
2195
2196         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2197         if (!p)
2198                 return nfserr_resource;
2199
2200         /*
2201          * For now we use a 0 here to indicate the null translation; in
2202          * the future we may place a call to translation code here.
2203          */
2204         *p++ = cpu_to_be32(0); /* lfs */
2205         *p++ = cpu_to_be32(0); /* pi */
2206         p = xdr_encode_opaque(p, context, len);
2207         return 0;
2208 }
2209 #else
2210 static inline __be32
2211 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2212                             void *context, int len)
2213 { return 0; }
2214 #endif
2215
2216 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2217 {
2218         /* As per referral draft:  */
2219         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2220             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2221                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2222                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2223                         *rdattr_err = NFSERR_MOVED;
2224                 else
2225                         return nfserr_moved;
2226         }
2227         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2228         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2229         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2230         return 0;
2231 }
2232
2233
2234 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2235 {
2236         struct path path = exp->ex_path;
2237         int err;
2238
2239         path_get(&path);
2240         while (follow_up(&path)) {
2241                 if (path.dentry != path.mnt->mnt_root)
2242                         break;
2243         }
2244         err = vfs_getattr(&path, stat);
2245         path_put(&path);
2246         return err;
2247 }
2248
2249 static __be32
2250 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2251 {
2252         __be32 *p;
2253
2254         if (bmval2) {
2255                 p = xdr_reserve_space(xdr, 16);
2256                 if (!p)
2257                         goto out_resource;
2258                 *p++ = cpu_to_be32(3);
2259                 *p++ = cpu_to_be32(bmval0);
2260                 *p++ = cpu_to_be32(bmval1);
2261                 *p++ = cpu_to_be32(bmval2);
2262         } else if (bmval1) {
2263                 p = xdr_reserve_space(xdr, 12);
2264                 if (!p)
2265                         goto out_resource;
2266                 *p++ = cpu_to_be32(2);
2267                 *p++ = cpu_to_be32(bmval0);
2268                 *p++ = cpu_to_be32(bmval1);
2269         } else {
2270                 p = xdr_reserve_space(xdr, 8);
2271                 if (!p)
2272                         goto out_resource;
2273                 *p++ = cpu_to_be32(1);
2274                 *p++ = cpu_to_be32(bmval0);
2275         }
2276
2277         return 0;
2278 out_resource:
2279         return nfserr_resource;
2280 }
2281
2282 /*
2283  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2284  * ourselves.
2285  */
2286 static __be32
2287 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2288                 struct svc_export *exp,
2289                 struct dentry *dentry, u32 *bmval,
2290                 struct svc_rqst *rqstp, int ignore_crossmnt)
2291 {
2292         u32 bmval0 = bmval[0];
2293         u32 bmval1 = bmval[1];
2294         u32 bmval2 = bmval[2];
2295         struct kstat stat;
2296         struct svc_fh *tempfh = NULL;
2297         struct kstatfs statfs;
2298         __be32 *p;
2299         int starting_len = xdr->buf->len;
2300         int attrlen_offset;
2301         __be32 attrlen;
2302         u32 dummy;
2303         u64 dummy64;
2304         u32 rdattr_err = 0;
2305         __be32 status;
2306         int err;
2307         struct nfs4_acl *acl = NULL;
2308         void *context = NULL;
2309         int contextlen;
2310         bool contextsupport = false;
2311         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2312         u32 minorversion = resp->cstate.minorversion;
2313         struct path path = {
2314                 .mnt    = exp->ex_path.mnt,
2315                 .dentry = dentry,
2316         };
2317         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2318
2319         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2320         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2321         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2322         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2323
2324         if (exp->ex_fslocs.migrated) {
2325                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2326                 if (status)
2327                         goto out;
2328         }
2329
2330         err = vfs_getattr(&path, &stat);
2331         if (err)
2332                 goto out_nfserr;
2333         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2334                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2335             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2336                        FATTR4_WORD1_SPACE_TOTAL))) {
2337                 err = vfs_statfs(&path, &statfs);
2338                 if (err)
2339                         goto out_nfserr;
2340         }
2341         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2342                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2343                 status = nfserr_jukebox;
2344                 if (!tempfh)
2345                         goto out;
2346                 fh_init(tempfh, NFS4_FHSIZE);
2347                 status = fh_compose(tempfh, exp, dentry, NULL);
2348                 if (status)
2349                         goto out;
2350                 fhp = tempfh;
2351         }
2352         if (bmval0 & FATTR4_WORD0_ACL) {
2353                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2354                 if (err == -EOPNOTSUPP)
2355                         bmval0 &= ~FATTR4_WORD0_ACL;
2356                 else if (err == -EINVAL) {
2357                         status = nfserr_attrnotsupp;
2358                         goto out;
2359                 } else if (err != 0)
2360                         goto out_nfserr;
2361         }
2362
2363 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2364         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2365              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2366                 err = security_inode_getsecctx(d_inode(dentry),
2367                                                 &context, &contextlen);
2368                 contextsupport = (err == 0);
2369                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2370                         if (err == -EOPNOTSUPP)
2371                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2372                         else if (err)
2373                                 goto out_nfserr;
2374                 }
2375         }
2376 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2377
2378         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2379         if (status)
2380                 goto out;
2381
2382         attrlen_offset = xdr->buf->len;
2383         p = xdr_reserve_space(xdr, 4);
2384         if (!p)
2385                 goto out_resource;
2386         p++;                /* to be backfilled later */
2387
2388         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2389                 u32 word0 = nfsd_suppattrs0(minorversion);
2390                 u32 word1 = nfsd_suppattrs1(minorversion);
2391                 u32 word2 = nfsd_suppattrs2(minorversion);
2392
2393                 if (!IS_POSIXACL(dentry->d_inode))
2394                         word0 &= ~FATTR4_WORD0_ACL;
2395                 if (!contextsupport)
2396                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2397                 if (!word2) {
2398                         p = xdr_reserve_space(xdr, 12);
2399                         if (!p)
2400                                 goto out_resource;
2401                         *p++ = cpu_to_be32(2);
2402                         *p++ = cpu_to_be32(word0);
2403                         *p++ = cpu_to_be32(word1);
2404                 } else {
2405                         p = xdr_reserve_space(xdr, 16);
2406                         if (!p)
2407                                 goto out_resource;
2408                         *p++ = cpu_to_be32(3);
2409                         *p++ = cpu_to_be32(word0);
2410                         *p++ = cpu_to_be32(word1);
2411                         *p++ = cpu_to_be32(word2);
2412                 }
2413         }
2414         if (bmval0 & FATTR4_WORD0_TYPE) {
2415                 p = xdr_reserve_space(xdr, 4);
2416                 if (!p)
2417                         goto out_resource;
2418                 dummy = nfs4_file_type(stat.mode);
2419                 if (dummy == NF4BAD) {
2420                         status = nfserr_serverfault;
2421                         goto out;
2422                 }
2423                 *p++ = cpu_to_be32(dummy);
2424         }
2425         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2426                 p = xdr_reserve_space(xdr, 4);
2427                 if (!p)
2428                         goto out_resource;
2429                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2430                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2431                 else
2432                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2433                                                 NFS4_FH_VOL_RENAME);
2434         }
2435         if (bmval0 & FATTR4_WORD0_CHANGE) {
2436                 p = xdr_reserve_space(xdr, 8);
2437                 if (!p)
2438                         goto out_resource;
2439                 p = encode_change(p, &stat, d_inode(dentry));
2440         }
2441         if (bmval0 & FATTR4_WORD0_SIZE) {
2442                 p = xdr_reserve_space(xdr, 8);
2443                 if (!p)
2444                         goto out_resource;
2445                 p = xdr_encode_hyper(p, stat.size);
2446         }
2447         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2448                 p = xdr_reserve_space(xdr, 4);
2449                 if (!p)
2450                         goto out_resource;
2451                 *p++ = cpu_to_be32(1);
2452         }
2453         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2454                 p = xdr_reserve_space(xdr, 4);
2455                 if (!p)
2456                         goto out_resource;
2457                 *p++ = cpu_to_be32(1);
2458         }
2459         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2460                 p = xdr_reserve_space(xdr, 4);
2461                 if (!p)
2462                         goto out_resource;
2463                 *p++ = cpu_to_be32(0);
2464         }
2465         if (bmval0 & FATTR4_WORD0_FSID) {
2466                 p = xdr_reserve_space(xdr, 16);
2467                 if (!p)
2468                         goto out_resource;
2469                 if (exp->ex_fslocs.migrated) {
2470                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2471                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2472                 } else switch(fsid_source(fhp)) {
2473                 case FSIDSOURCE_FSID:
2474                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2475                         p = xdr_encode_hyper(p, (u64)0);
2476                         break;
2477                 case FSIDSOURCE_DEV:
2478                         *p++ = cpu_to_be32(0);
2479                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2480                         *p++ = cpu_to_be32(0);
2481                         *p++ = cpu_to_be32(MINOR(stat.dev));
2482                         break;
2483                 case FSIDSOURCE_UUID:
2484                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2485                                                                 EX_UUID_LEN);
2486                         break;
2487                 }
2488         }
2489         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2490                 p = xdr_reserve_space(xdr, 4);
2491                 if (!p)
2492                         goto out_resource;
2493                 *p++ = cpu_to_be32(0);
2494         }
2495         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2496                 p = xdr_reserve_space(xdr, 4);
2497                 if (!p)
2498                         goto out_resource;
2499                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2500         }
2501         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2502                 p = xdr_reserve_space(xdr, 4);
2503                 if (!p)
2504                         goto out_resource;
2505                 *p++ = cpu_to_be32(rdattr_err);
2506         }
2507         if (bmval0 & FATTR4_WORD0_ACL) {
2508                 struct nfs4_ace *ace;
2509
2510                 if (acl == NULL) {
2511                         p = xdr_reserve_space(xdr, 4);
2512                         if (!p)
2513                                 goto out_resource;
2514
2515                         *p++ = cpu_to_be32(0);
2516                         goto out_acl;
2517                 }
2518                 p = xdr_reserve_space(xdr, 4);
2519                 if (!p)
2520                         goto out_resource;
2521                 *p++ = cpu_to_be32(acl->naces);
2522
2523                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2524                         p = xdr_reserve_space(xdr, 4*3);
2525                         if (!p)
2526                                 goto out_resource;
2527                         *p++ = cpu_to_be32(ace->type);
2528                         *p++ = cpu_to_be32(ace->flag);
2529                         *p++ = cpu_to_be32(ace->access_mask &
2530                                                         NFS4_ACE_MASK_ALL);
2531                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2532                         if (status)
2533                                 goto out;
2534                 }
2535         }
2536 out_acl:
2537         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2538                 p = xdr_reserve_space(xdr, 4);
2539                 if (!p)
2540                         goto out_resource;
2541                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2542                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2543         }
2544         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2545                 p = xdr_reserve_space(xdr, 4);
2546                 if (!p)
2547                         goto out_resource;
2548                 *p++ = cpu_to_be32(1);
2549         }
2550         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2551                 p = xdr_reserve_space(xdr, 4);
2552                 if (!p)
2553                         goto out_resource;
2554                 *p++ = cpu_to_be32(0);
2555         }
2556         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2557                 p = xdr_reserve_space(xdr, 4);
2558                 if (!p)
2559                         goto out_resource;
2560                 *p++ = cpu_to_be32(1);
2561         }
2562         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2563                 p = xdr_reserve_space(xdr, 4);
2564                 if (!p)
2565                         goto out_resource;
2566                 *p++ = cpu_to_be32(1);
2567         }
2568         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2569                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2570                 if (!p)
2571                         goto out_resource;
2572                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2573                                         fhp->fh_handle.fh_size);
2574         }
2575         if (bmval0 & FATTR4_WORD0_FILEID) {
2576                 p = xdr_reserve_space(xdr, 8);
2577                 if (!p)
2578                         goto out_resource;
2579                 p = xdr_encode_hyper(p, stat.ino);
2580         }
2581         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2582                 p = xdr_reserve_space(xdr, 8);
2583                 if (!p)
2584                         goto out_resource;
2585                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2586         }
2587         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2588                 p = xdr_reserve_space(xdr, 8);
2589                 if (!p)
2590                         goto out_resource;
2591                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2592         }
2593         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2594                 p = xdr_reserve_space(xdr, 8);
2595                 if (!p)
2596                         goto out_resource;
2597                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2598         }
2599         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2600                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2601                 if (status)
2602                         goto out;
2603         }
2604         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2605                 p = xdr_reserve_space(xdr, 4);
2606                 if (!p)
2607                         goto out_resource;
2608                 *p++ = cpu_to_be32(1);
2609         }
2610         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2611                 p = xdr_reserve_space(xdr, 8);
2612                 if (!p)
2613                         goto out_resource;
2614                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2615         }
2616         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2617                 p = xdr_reserve_space(xdr, 4);
2618                 if (!p)
2619                         goto out_resource;
2620                 *p++ = cpu_to_be32(255);
2621         }
2622         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2623                 p = xdr_reserve_space(xdr, 4);
2624                 if (!p)
2625                         goto out_resource;
2626                 *p++ = cpu_to_be32(statfs.f_namelen);
2627         }
2628         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2629                 p = xdr_reserve_space(xdr, 8);
2630                 if (!p)
2631                         goto out_resource;
2632                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2633         }
2634         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2635                 p = xdr_reserve_space(xdr, 8);
2636                 if (!p)
2637                         goto out_resource;
2638                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2639         }
2640         if (bmval1 & FATTR4_WORD1_MODE) {
2641                 p = xdr_reserve_space(xdr, 4);
2642                 if (!p)
2643                         goto out_resource;
2644                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2645         }
2646         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2647                 p = xdr_reserve_space(xdr, 4);
2648                 if (!p)
2649                         goto out_resource;
2650                 *p++ = cpu_to_be32(1);
2651         }
2652         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2653                 p = xdr_reserve_space(xdr, 4);
2654                 if (!p)
2655                         goto out_resource;
2656                 *p++ = cpu_to_be32(stat.nlink);
2657         }
2658         if (bmval1 & FATTR4_WORD1_OWNER) {
2659                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2660                 if (status)
2661                         goto out;
2662         }
2663         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2664                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2665                 if (status)
2666                         goto out;
2667         }
2668         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2669                 p = xdr_reserve_space(xdr, 8);
2670                 if (!p)
2671                         goto out_resource;
2672                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2673                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2674         }
2675         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2676                 p = xdr_reserve_space(xdr, 8);
2677                 if (!p)
2678                         goto out_resource;
2679                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2680                 p = xdr_encode_hyper(p, dummy64);
2681         }
2682         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2683                 p = xdr_reserve_space(xdr, 8);
2684                 if (!p)
2685                         goto out_resource;
2686                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2687                 p = xdr_encode_hyper(p, dummy64);
2688         }
2689         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2690                 p = xdr_reserve_space(xdr, 8);
2691                 if (!p)
2692                         goto out_resource;
2693                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2694                 p = xdr_encode_hyper(p, dummy64);
2695         }
2696         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2697                 p = xdr_reserve_space(xdr, 8);
2698                 if (!p)
2699                         goto out_resource;
2700                 dummy64 = (u64)stat.blocks << 9;
2701                 p = xdr_encode_hyper(p, dummy64);
2702         }
2703         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2704                 p = xdr_reserve_space(xdr, 12);
2705                 if (!p)
2706                         goto out_resource;
2707                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2708                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2709         }
2710         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2711                 p = xdr_reserve_space(xdr, 12);
2712                 if (!p)
2713                         goto out_resource;
2714                 *p++ = cpu_to_be32(0);
2715                 *p++ = cpu_to_be32(1);
2716                 *p++ = cpu_to_be32(0);
2717         }
2718         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2719                 p = xdr_reserve_space(xdr, 12);
2720                 if (!p)
2721                         goto out_resource;
2722                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2723                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2724         }
2725         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2726                 p = xdr_reserve_space(xdr, 12);
2727                 if (!p)
2728                         goto out_resource;
2729                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2730                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2731         }
2732         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2733                 struct kstat parent_stat;
2734                 u64 ino = stat.ino;
2735
2736                 p = xdr_reserve_space(xdr, 8);
2737                 if (!p)
2738                         goto out_resource;
2739                 /*
2740                  * Get parent's attributes if not ignoring crossmount
2741                  * and this is the root of a cross-mounted filesystem.
2742                  */
2743                 if (ignore_crossmnt == 0 &&
2744                     dentry == exp->ex_path.mnt->mnt_root) {
2745                         err = get_parent_attributes(exp, &parent_stat);
2746                         if (err)
2747                                 goto out_nfserr;
2748                         ino = parent_stat.ino;
2749                 }
2750                 p = xdr_encode_hyper(p, ino);
2751         }
2752 #ifdef CONFIG_NFSD_PNFS
2753         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2754                 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2755                 if (status)
2756                         goto out;
2757         }
2758
2759         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2760                 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2761                 if (status)
2762                         goto out;
2763         }
2764
2765         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2766                 p = xdr_reserve_space(xdr, 4);
2767                 if (!p)
2768                         goto out_resource;
2769                 *p++ = cpu_to_be32(stat.blksize);
2770         }
2771 #endif /* CONFIG_NFSD_PNFS */
2772         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2773                 status = nfsd4_encode_bitmap(xdr, NFSD_SUPPATTR_EXCLCREAT_WORD0,
2774                                                   NFSD_SUPPATTR_EXCLCREAT_WORD1,
2775                                                   NFSD_SUPPATTR_EXCLCREAT_WORD2);
2776                 if (status)
2777                         goto out;
2778         }
2779
2780         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2781                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2782                                                                 contextlen);
2783                 if (status)
2784                         goto out;
2785         }
2786
2787         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2788         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2789         status = nfs_ok;
2790
2791 out:
2792 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2793         if (context)
2794                 security_release_secctx(context, contextlen);
2795 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2796         kfree(acl);
2797         if (tempfh) {
2798                 fh_put(tempfh);
2799                 kfree(tempfh);
2800         }
2801         if (status)
2802                 xdr_truncate_encode(xdr, starting_len);
2803         return status;
2804 out_nfserr:
2805         status = nfserrno(err);
2806         goto out;
2807 out_resource:
2808         status = nfserr_resource;
2809         goto out;
2810 }
2811
2812 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2813                                 struct xdr_buf *buf, __be32 *p, int bytes)
2814 {
2815         xdr->scratch.iov_len = 0;
2816         memset(buf, 0, sizeof(struct xdr_buf));
2817         buf->head[0].iov_base = p;
2818         buf->head[0].iov_len = 0;
2819         buf->len = 0;
2820         xdr->buf = buf;
2821         xdr->iov = buf->head;
2822         xdr->p = p;
2823         xdr->end = (void *)p + bytes;
2824         buf->buflen = bytes;
2825 }
2826
2827 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2828                         struct svc_fh *fhp, struct svc_export *exp,
2829                         struct dentry *dentry, u32 *bmval,
2830                         struct svc_rqst *rqstp, int ignore_crossmnt)
2831 {
2832         struct xdr_buf dummy;
2833         struct xdr_stream xdr;
2834         __be32 ret;
2835
2836         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2837         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2838                                                         ignore_crossmnt);
2839         *p = xdr.p;
2840         return ret;
2841 }
2842
2843 static inline int attributes_need_mount(u32 *bmval)
2844 {
2845         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2846                 return 1;
2847         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2848                 return 1;
2849         return 0;
2850 }
2851
2852 static __be32
2853 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2854                         const char *name, int namlen)
2855 {
2856         struct svc_export *exp = cd->rd_fhp->fh_export;
2857         struct dentry *dentry;
2858         __be32 nfserr;
2859         int ignore_crossmnt = 0;
2860
2861         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2862         if (IS_ERR(dentry))
2863                 return nfserrno(PTR_ERR(dentry));
2864         if (d_really_is_negative(dentry)) {
2865                 /*
2866                  * we're not holding the i_mutex here, so there's
2867                  * a window where this directory entry could have gone
2868                  * away.
2869                  */
2870                 dput(dentry);
2871                 return nfserr_noent;
2872         }
2873
2874         exp_get(exp);
2875         /*
2876          * In the case of a mountpoint, the client may be asking for
2877          * attributes that are only properties of the underlying filesystem
2878          * as opposed to the cross-mounted file system. In such a case,
2879          * we will not follow the cross mount and will fill the attribtutes
2880          * directly from the mountpoint dentry.
2881          */
2882         if (nfsd_mountpoint(dentry, exp)) {
2883                 int err;
2884
2885                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2886                                 && !attributes_need_mount(cd->rd_bmval)) {
2887                         ignore_crossmnt = 1;
2888                         goto out_encode;
2889                 }
2890                 /*
2891                  * Why the heck aren't we just using nfsd_lookup??
2892                  * Different "."/".." handling?  Something else?
2893                  * At least, add a comment here to explain....
2894                  */
2895                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2896                 if (err) {
2897                         nfserr = nfserrno(err);
2898                         goto out_put;
2899                 }
2900                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2901                 if (nfserr)
2902                         goto out_put;
2903
2904         }
2905 out_encode:
2906         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2907                                         cd->rd_rqstp, ignore_crossmnt);
2908 out_put:
2909         dput(dentry);
2910         exp_put(exp);
2911         return nfserr;
2912 }
2913
2914 static __be32 *
2915 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2916 {
2917         __be32 *p;
2918
2919         p = xdr_reserve_space(xdr, 20);
2920         if (!p)
2921                 return NULL;
2922         *p++ = htonl(2);
2923         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2924         *p++ = htonl(0);                         /* bmval1 */
2925
2926         *p++ = htonl(4);     /* attribute length */
2927         *p++ = nfserr;       /* no htonl */
2928         return p;
2929 }
2930
2931 static int
2932 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2933                     loff_t offset, u64 ino, unsigned int d_type)
2934 {
2935         struct readdir_cd *ccd = ccdv;
2936         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2937         struct xdr_stream *xdr = cd->xdr;
2938         int start_offset = xdr->buf->len;
2939         int cookie_offset;
2940         u32 name_and_cookie;
2941         int entry_bytes;
2942         __be32 nfserr = nfserr_toosmall;
2943         __be64 wire_offset;
2944         __be32 *p;
2945
2946         /* In nfsv4, "." and ".." never make it onto the wire.. */
2947         if (name && isdotent(name, namlen)) {
2948                 cd->common.err = nfs_ok;
2949                 return 0;
2950         }
2951
2952         if (cd->cookie_offset) {
2953                 wire_offset = cpu_to_be64(offset);
2954                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2955                                                         &wire_offset, 8);
2956         }
2957
2958         p = xdr_reserve_space(xdr, 4);
2959         if (!p)
2960                 goto fail;
2961         *p++ = xdr_one;                             /* mark entry present */
2962         cookie_offset = xdr->buf->len;
2963         p = xdr_reserve_space(xdr, 3*4 + namlen);
2964         if (!p)
2965                 goto fail;
2966         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2967         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2968
2969         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2970         switch (nfserr) {
2971         case nfs_ok:
2972                 break;
2973         case nfserr_resource:
2974                 nfserr = nfserr_toosmall;
2975                 goto fail;
2976         case nfserr_noent:
2977                 xdr_truncate_encode(xdr, start_offset);
2978                 goto skip_entry;
2979         default:
2980                 /*
2981                  * If the client requested the RDATTR_ERROR attribute,
2982                  * we stuff the error code into this attribute
2983                  * and continue.  If this attribute was not requested,
2984                  * then in accordance with the spec, we fail the
2985                  * entire READDIR operation(!)
2986                  */
2987                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2988                         goto fail;
2989                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2990                 if (p == NULL) {
2991                         nfserr = nfserr_toosmall;
2992                         goto fail;
2993                 }
2994         }
2995         nfserr = nfserr_toosmall;
2996         entry_bytes = xdr->buf->len - start_offset;
2997         if (entry_bytes > cd->rd_maxcount)
2998                 goto fail;
2999         cd->rd_maxcount -= entry_bytes;
3000         /*
3001          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3002          * let's always let through the first entry, at least:
3003          */
3004         if (!cd->rd_dircount)
3005                 goto fail;
3006         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3007         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3008                 goto fail;
3009         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3010
3011         cd->cookie_offset = cookie_offset;
3012 skip_entry:
3013         cd->common.err = nfs_ok;
3014         return 0;
3015 fail:
3016         xdr_truncate_encode(xdr, start_offset);
3017         cd->common.err = nfserr;
3018         return -EINVAL;
3019 }
3020
3021 static __be32
3022 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3023 {
3024         __be32 *p;
3025
3026         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3027         if (!p)
3028                 return nfserr_resource;
3029         *p++ = cpu_to_be32(sid->si_generation);
3030         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3031                                         sizeof(stateid_opaque_t));
3032         return 0;
3033 }
3034
3035 static __be32
3036 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3037 {
3038         struct xdr_stream *xdr = &resp->xdr;
3039         __be32 *p;
3040
3041         if (!nfserr) {
3042                 p = xdr_reserve_space(xdr, 8);
3043                 if (!p)
3044                         return nfserr_resource;
3045                 *p++ = cpu_to_be32(access->ac_supported);
3046                 *p++ = cpu_to_be32(access->ac_resp_access);
3047         }
3048         return nfserr;
3049 }
3050
3051 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3052 {
3053         struct xdr_stream *xdr = &resp->xdr;
3054         __be32 *p;
3055
3056         if (!nfserr) {
3057                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3058                 if (!p)
3059                         return nfserr_resource;
3060                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3061                                                 NFS4_MAX_SESSIONID_LEN);
3062                 *p++ = cpu_to_be32(bcts->dir);
3063                 /* Sorry, we do not yet support RDMA over 4.1: */
3064                 *p++ = cpu_to_be32(0);
3065         }
3066         return nfserr;
3067 }
3068
3069 static __be32
3070 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3071 {
3072         struct xdr_stream *xdr = &resp->xdr;
3073
3074         if (!nfserr)
3075                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3076
3077         return nfserr;
3078 }
3079
3080
3081 static __be32
3082 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3083 {
3084         struct xdr_stream *xdr = &resp->xdr;
3085         __be32 *p;
3086
3087         if (!nfserr) {
3088                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3089                 if (!p)
3090                         return nfserr_resource;
3091                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3092                                                 NFS4_VERIFIER_SIZE);
3093         }
3094         return nfserr;
3095 }
3096
3097 static __be32
3098 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3099 {
3100         struct xdr_stream *xdr = &resp->xdr;
3101         __be32 *p;
3102
3103         if (!nfserr) {
3104                 p = xdr_reserve_space(xdr, 20);
3105                 if (!p)
3106                         return nfserr_resource;
3107                 encode_cinfo(p, &create->cr_cinfo);
3108                 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3109                                 create->cr_bmval[1], create->cr_bmval[2]);
3110         }
3111         return nfserr;
3112 }
3113
3114 static __be32
3115 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3116 {
3117         struct svc_fh *fhp = getattr->ga_fhp;
3118         struct xdr_stream *xdr = &resp->xdr;
3119
3120         if (nfserr)
3121                 return nfserr;
3122
3123         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3124                                     getattr->ga_bmval,
3125                                     resp->rqstp, 0);
3126         return nfserr;
3127 }
3128
3129 static __be32
3130 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3131 {
3132         struct xdr_stream *xdr = &resp->xdr;
3133         struct svc_fh *fhp = *fhpp;
3134         unsigned int len;
3135         __be32 *p;
3136
3137         if (!nfserr) {
3138                 len = fhp->fh_handle.fh_size;
3139                 p = xdr_reserve_space(xdr, len + 4);
3140                 if (!p)
3141                         return nfserr_resource;
3142                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3143         }
3144         return nfserr;
3145 }
3146
3147 /*
3148 * Including all fields other than the name, a LOCK4denied structure requires
3149 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3150 */
3151 static __be32
3152 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3153 {
3154         struct xdr_netobj *conf = &ld->ld_owner;
3155         __be32 *p;
3156
3157 again:
3158         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3159         if (!p) {
3160                 /*
3161                  * Don't fail to return the result just because we can't
3162                  * return the conflicting open:
3163                  */
3164                 if (conf->len) {
3165                         kfree(conf->data);
3166                         conf->len = 0;
3167                         conf->data = NULL;
3168                         goto again;
3169                 }
3170                 return nfserr_resource;
3171         }
3172         p = xdr_encode_hyper(p, ld->ld_start);
3173         p = xdr_encode_hyper(p, ld->ld_length);
3174         *p++ = cpu_to_be32(ld->ld_type);
3175         if (conf->len) {
3176                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3177                 p = xdr_encode_opaque(p, conf->data, conf->len);
3178                 kfree(conf->data);
3179         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3180                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3181                 *p++ = cpu_to_be32(0); /* length of owner name */
3182         }
3183         return nfserr_denied;
3184 }
3185
3186 static __be32
3187 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3188 {
3189         struct xdr_stream *xdr = &resp->xdr;
3190
3191         if (!nfserr)
3192                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3193         else if (nfserr == nfserr_denied)
3194                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3195
3196         return nfserr;
3197 }
3198
3199 static __be32
3200 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3201 {
3202         struct xdr_stream *xdr = &resp->xdr;
3203
3204         if (nfserr == nfserr_denied)
3205                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3206         return nfserr;
3207 }
3208
3209 static __be32
3210 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3211 {
3212         struct xdr_stream *xdr = &resp->xdr;
3213
3214         if (!nfserr)
3215                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3216
3217         return nfserr;
3218 }
3219
3220
3221 static __be32
3222 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3223 {
3224         struct xdr_stream *xdr = &resp->xdr;
3225         __be32 *p;
3226
3227         if (!nfserr) {
3228                 p = xdr_reserve_space(xdr, 20);
3229                 if (!p)
3230                         return nfserr_resource;
3231                 p = encode_cinfo(p, &link->li_cinfo);
3232         }
3233         return nfserr;
3234 }
3235
3236
3237 static __be32
3238 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3239 {
3240         struct xdr_stream *xdr = &resp->xdr;
3241         __be32 *p;
3242
3243         if (nfserr)
3244                 goto out;
3245
3246         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3247         if (nfserr)
3248                 goto out;
3249         p = xdr_reserve_space(xdr, 24);
3250         if (!p)
3251                 return nfserr_resource;
3252         p = encode_cinfo(p, &open->op_cinfo);
3253         *p++ = cpu_to_be32(open->op_rflags);
3254
3255         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3256                                         open->op_bmval[2]);
3257         if (nfserr)
3258                 goto out;
3259
3260         p = xdr_reserve_space(xdr, 4);
3261         if (!p)
3262                 return nfserr_resource;
3263
3264         *p++ = cpu_to_be32(open->op_delegate_type);
3265         switch (open->op_delegate_type) {
3266         case NFS4_OPEN_DELEGATE_NONE:
3267                 break;
3268         case NFS4_OPEN_DELEGATE_READ:
3269                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3270                 if (nfserr)
3271                         return nfserr;
3272                 p = xdr_reserve_space(xdr, 20);
3273                 if (!p)
3274                         return nfserr_resource;
3275                 *p++ = cpu_to_be32(open->op_recall);
3276
3277                 /*
3278                  * TODO: ACE's in delegations
3279                  */
3280                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3281                 *p++ = cpu_to_be32(0);
3282                 *p++ = cpu_to_be32(0);
3283                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3284                 break;
3285         case NFS4_OPEN_DELEGATE_WRITE:
3286                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3287                 if (nfserr)
3288                         return nfserr;
3289                 p = xdr_reserve_space(xdr, 32);
3290                 if (!p)
3291                         return nfserr_resource;
3292                 *p++ = cpu_to_be32(0);
3293
3294                 /*
3295                  * TODO: space_limit's in delegations
3296                  */
3297                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3298                 *p++ = cpu_to_be32(~(u32)0);
3299                 *p++ = cpu_to_be32(~(u32)0);
3300
3301                 /*
3302                  * TODO: ACE's in delegations
3303                  */
3304                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3305                 *p++ = cpu_to_be32(0);
3306                 *p++ = cpu_to_be32(0);
3307                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3308                 break;
3309         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3310                 switch (open->op_why_no_deleg) {
3311                 case WND4_CONTENTION:
3312                 case WND4_RESOURCE:
3313                         p = xdr_reserve_space(xdr, 8);
3314                         if (!p)
3315                                 return nfserr_resource;
3316                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3317                         /* deleg signaling not supported yet: */
3318                         *p++ = cpu_to_be32(0);
3319                         break;
3320                 default:
3321                         p = xdr_reserve_space(xdr, 4);
3322                         if (!p)
3323                                 return nfserr_resource;
3324                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3325                 }
3326                 break;
3327         default:
3328                 BUG();
3329         }
3330         /* XXX save filehandle here */
3331 out:
3332         return nfserr;
3333 }
3334
3335 static __be32
3336 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3337 {
3338         struct xdr_stream *xdr = &resp->xdr;
3339
3340         if (!nfserr)
3341                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3342
3343         return nfserr;
3344 }
3345
3346 static __be32
3347 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3348 {
3349         struct xdr_stream *xdr = &resp->xdr;
3350
3351         if (!nfserr)
3352                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3353
3354         return nfserr;
3355 }
3356
3357 static __be32 nfsd4_encode_splice_read(
3358                                 struct nfsd4_compoundres *resp,
3359                                 struct nfsd4_read *read,
3360                                 struct file *file, unsigned long maxcount)
3361 {
3362         struct xdr_stream *xdr = &resp->xdr;
3363         struct xdr_buf *buf = xdr->buf;
3364         u32 eof;
3365         int space_left;
3366         __be32 nfserr;
3367         __be32 *p = xdr->p - 2;
3368
3369         /* Make sure there will be room for padding if needed */
3370         if (xdr->end - xdr->p < 1)
3371                 return nfserr_resource;
3372
3373         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3374                                   read->rd_offset, &maxcount);
3375         if (nfserr) {
3376                 /*
3377                  * nfsd_splice_actor may have already messed with the
3378                  * page length; reset it so as not to confuse
3379                  * xdr_truncate_encode:
3380                  */
3381                 buf->page_len = 0;
3382                 return nfserr;
3383         }
3384
3385         eof = (read->rd_offset + maxcount >=
3386                d_inode(read->rd_fhp->fh_dentry)->i_size);
3387
3388         *(p++) = htonl(eof);
3389         *(p++) = htonl(maxcount);
3390
3391         buf->page_len = maxcount;
3392         buf->len += maxcount;
3393         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3394                                                         / PAGE_SIZE;
3395
3396         /* Use rest of head for padding and remaining ops: */
3397         buf->tail[0].iov_base = xdr->p;
3398         buf->tail[0].iov_len = 0;
3399         xdr->iov = buf->tail;
3400         if (maxcount&3) {
3401                 int pad = 4 - (maxcount&3);
3402
3403                 *(xdr->p++) = 0;
3404
3405                 buf->tail[0].iov_base += maxcount&3;
3406                 buf->tail[0].iov_len = pad;
3407                 buf->len += pad;
3408         }
3409
3410         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3411                                 buf->buflen - buf->len);
3412         buf->buflen = buf->len + space_left;
3413         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3414
3415         return 0;
3416 }
3417
3418 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3419                                  struct nfsd4_read *read,
3420                                  struct file *file, unsigned long maxcount)
3421 {
3422         struct xdr_stream *xdr = &resp->xdr;
3423         u32 eof;
3424         int v;
3425         int starting_len = xdr->buf->len - 8;
3426         long len;
3427         int thislen;
3428         __be32 nfserr;
3429         __be32 tmp;
3430         __be32 *p;
3431         u32 zzz = 0;
3432         int pad;
3433
3434         len = maxcount;
3435         v = 0;
3436
3437         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3438         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3439         WARN_ON_ONCE(!p);
3440         resp->rqstp->rq_vec[v].iov_base = p;
3441         resp->rqstp->rq_vec[v].iov_len = thislen;
3442         v++;
3443         len -= thislen;
3444
3445         while (len) {
3446                 thislen = min_t(long, len, PAGE_SIZE);
3447                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3448                 WARN_ON_ONCE(!p);
3449                 resp->rqstp->rq_vec[v].iov_base = p;
3450                 resp->rqstp->rq_vec[v].iov_len = thislen;
3451                 v++;
3452                 len -= thislen;
3453         }
3454         read->rd_vlen = v;
3455
3456         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3457                         read->rd_vlen, &maxcount);
3458         if (nfserr)
3459                 return nfserr;
3460         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3461
3462         eof = (read->rd_offset + maxcount >=
3463                d_inode(read->rd_fhp->fh_dentry)->i_size);
3464
3465         tmp = htonl(eof);
3466         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3467         tmp = htonl(maxcount);
3468         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3469
3470         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3471         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3472                                                                 &zzz, pad);
3473         return 0;
3474
3475 }
3476
3477 static __be32
3478 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3479                   struct nfsd4_read *read)
3480 {
3481         unsigned long maxcount;
3482         struct xdr_stream *xdr = &resp->xdr;
3483         struct file *file = read->rd_filp;
3484         int starting_len = xdr->buf->len;
3485         struct raparms *ra = NULL;
3486         __be32 *p;
3487
3488         if (nfserr)
3489                 goto out;
3490
3491         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3492         if (!p) {
3493                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3494                 nfserr = nfserr_resource;
3495                 goto out;
3496         }
3497         if (resp->xdr.buf->page_len &&
3498             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3499                 WARN_ON_ONCE(1);
3500                 nfserr = nfserr_resource;
3501                 goto out;
3502         }
3503         xdr_commit_encode(xdr);
3504
3505         maxcount = svc_max_payload(resp->rqstp);
3506         maxcount = min_t(unsigned long, maxcount,
3507                          (xdr->buf->buflen - xdr->buf->len));
3508         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3509
3510         if (read->rd_tmp_file)
3511                 ra = nfsd_init_raparms(file);
3512
3513         if (file->f_op->splice_read &&
3514             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3515                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3516         else
3517                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3518
3519         if (ra)
3520                 nfsd_put_raparams(file, ra);
3521
3522         if (nfserr)
3523                 xdr_truncate_encode(xdr, starting_len);
3524
3525 out:
3526         if (file)
3527                 fput(file);
3528         return nfserr;
3529 }
3530
3531 static __be32
3532 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3533 {
3534         int maxcount;
3535         __be32 wire_count;
3536         int zero = 0;
3537         struct xdr_stream *xdr = &resp->xdr;
3538         int length_offset = xdr->buf->len;
3539         __be32 *p;
3540
3541         if (nfserr)
3542                 return nfserr;
3543
3544         p = xdr_reserve_space(xdr, 4);
3545         if (!p)
3546                 return nfserr_resource;
3547         maxcount = PAGE_SIZE;
3548
3549         p = xdr_reserve_space(xdr, maxcount);
3550         if (!p)
3551                 return nfserr_resource;
3552         /*
3553          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3554          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3555          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3556          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3557          */
3558         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3559                                                 (char *)p, &maxcount);
3560         if (nfserr == nfserr_isdir)
3561                 nfserr = nfserr_inval;
3562         if (nfserr) {
3563                 xdr_truncate_encode(xdr, length_offset);
3564                 return nfserr;
3565         }
3566
3567         wire_count = htonl(maxcount);
3568         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3569         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3570         if (maxcount & 3)
3571                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3572                                                 &zero, 4 - (maxcount&3));
3573         return 0;
3574 }
3575
3576 static __be32
3577 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3578 {
3579         int maxcount;
3580         int bytes_left;
3581         loff_t offset;
3582         __be64 wire_offset;
3583         struct xdr_stream *xdr = &resp->xdr;
3584         int starting_len = xdr->buf->len;
3585         __be32 *p;
3586
3587         if (nfserr)
3588                 return nfserr;
3589
3590         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3591         if (!p)
3592                 return nfserr_resource;
3593
3594         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3595         *p++ = cpu_to_be32(0);
3596         *p++ = cpu_to_be32(0);
3597         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3598                                 - (char *)resp->xdr.buf->head[0].iov_base;
3599
3600         /*
3601          * Number of bytes left for directory entries allowing for the
3602          * final 8 bytes of the readdir and a following failed op:
3603          */
3604         bytes_left = xdr->buf->buflen - xdr->buf->len
3605                         - COMPOUND_ERR_SLACK_SPACE - 8;
3606         if (bytes_left < 0) {
3607                 nfserr = nfserr_resource;
3608                 goto err_no_verf;
3609         }
3610         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3611         /*
3612          * Note the rfc defines rd_maxcount as the size of the
3613          * READDIR4resok structure, which includes the verifier above
3614          * and the 8 bytes encoded at the end of this function:
3615          */
3616         if (maxcount < 16) {
3617                 nfserr = nfserr_toosmall;
3618                 goto err_no_verf;
3619         }
3620         maxcount = min_t(int, maxcount-16, bytes_left);
3621
3622         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3623         if (!readdir->rd_dircount)
3624                 readdir->rd_dircount = INT_MAX;
3625
3626         readdir->xdr = xdr;
3627         readdir->rd_maxcount = maxcount;
3628         readdir->common.err = 0;
3629         readdir->cookie_offset = 0;
3630
3631         offset = readdir->rd_cookie;
3632         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3633                               &offset,
3634                               &readdir->common, nfsd4_encode_dirent);
3635         if (nfserr == nfs_ok &&
3636             readdir->common.err == nfserr_toosmall &&
3637             xdr->buf->len == starting_len + 8) {
3638                 /* nothing encoded; which limit did we hit?: */
3639                 if (maxcount - 16 < bytes_left)
3640                         /* It was the fault of rd_maxcount: */
3641                         nfserr = nfserr_toosmall;
3642                 else
3643                         /* We ran out of buffer space: */
3644                         nfserr = nfserr_resource;
3645         }
3646         if (nfserr)
3647                 goto err_no_verf;
3648
3649         if (readdir->cookie_offset) {
3650                 wire_offset = cpu_to_be64(offset);
3651                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3652                                                         &wire_offset, 8);
3653         }
3654
3655         p = xdr_reserve_space(xdr, 8);
3656         if (!p) {
3657                 WARN_ON_ONCE(1);
3658                 goto err_no_verf;
3659         }
3660         *p++ = 0;       /* no more entries */
3661         *p++ = htonl(readdir->common.err == nfserr_eof);
3662
3663         return 0;
3664 err_no_verf:
3665         xdr_truncate_encode(xdr, starting_len);
3666         return nfserr;
3667 }
3668
3669 static __be32
3670 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3671 {
3672         struct xdr_stream *xdr = &resp->xdr;
3673         __be32 *p;
3674
3675         if (!nfserr) {
3676                 p = xdr_reserve_space(xdr, 20);
3677                 if (!p)
3678                         return nfserr_resource;
3679                 p = encode_cinfo(p, &remove->rm_cinfo);
3680         }
3681         return nfserr;
3682 }
3683
3684 static __be32
3685 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3686 {
3687         struct xdr_stream *xdr = &resp->xdr;
3688         __be32 *p;
3689
3690         if (!nfserr) {
3691                 p = xdr_reserve_space(xdr, 40);
3692                 if (!p)
3693                         return nfserr_resource;
3694                 p = encode_cinfo(p, &rename->rn_sinfo);
3695                 p = encode_cinfo(p, &rename->rn_tinfo);
3696         }
3697         return nfserr;
3698 }
3699
3700 static __be32
3701 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3702                          __be32 nfserr, struct svc_export *exp)
3703 {
3704         u32 i, nflavs, supported;
3705         struct exp_flavor_info *flavs;
3706         struct exp_flavor_info def_flavs[2];
3707         __be32 *p, *flavorsp;
3708         static bool report = true;
3709
3710         if (nfserr)
3711                 goto out;
3712         nfserr = nfserr_resource;
3713         if (exp->ex_nflavors) {
3714                 flavs = exp->ex_flavors;
3715                 nflavs = exp->ex_nflavors;
3716         } else { /* Handling of some defaults in absence of real secinfo: */
3717                 flavs = def_flavs;
3718                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3719                         nflavs = 2;
3720                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3721                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3722                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3723                         nflavs = 1;
3724                         flavs[0].pseudoflavor
3725                                         = svcauth_gss_flavor(exp->ex_client);
3726                 } else {
3727                         nflavs = 1;
3728                         flavs[0].pseudoflavor
3729                                         = exp->ex_client->flavour->flavour;
3730                 }
3731         }
3732
3733         supported = 0;
3734         p = xdr_reserve_space(xdr, 4);
3735         if (!p)
3736                 goto out;
3737         flavorsp = p++;         /* to be backfilled later */
3738
3739         for (i = 0; i < nflavs; i++) {
3740                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3741                 struct rpcsec_gss_info info;
3742
3743                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3744                         supported++;
3745                         p = xdr_reserve_space(xdr, 4 + 4 +
3746                                               XDR_LEN(info.oid.len) + 4 + 4);
3747                         if (!p)
3748                                 goto out;
3749                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3750                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3751                         *p++ = cpu_to_be32(info.qop);
3752                         *p++ = cpu_to_be32(info.service);
3753                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3754                         supported++;
3755                         p = xdr_reserve_space(xdr, 4);
3756                         if (!p)
3757                                 goto out;
3758                         *p++ = cpu_to_be32(pf);
3759                 } else {
3760                         if (report)
3761                                 pr_warn("NFS: SECINFO: security flavor %u "
3762                                         "is not supported\n", pf);
3763                 }
3764         }
3765
3766         if (nflavs != supported)
3767                 report = false;
3768         *flavorsp = htonl(supported);
3769         nfserr = 0;
3770 out:
3771         if (exp)
3772                 exp_put(exp);
3773         return nfserr;
3774 }
3775
3776 static __be32
3777 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3778                      struct nfsd4_secinfo *secinfo)
3779 {
3780         struct xdr_stream *xdr = &resp->xdr;
3781
3782         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3783 }
3784
3785 static __be32
3786 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3787                      struct nfsd4_secinfo_no_name *secinfo)
3788 {
3789         struct xdr_stream *xdr = &resp->xdr;
3790
3791         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3792 }
3793
3794 /*
3795  * The SETATTR encode routine is special -- it always encodes a bitmap,
3796  * regardless of the error status.
3797  */
3798 static __be32
3799 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3800 {
3801         struct xdr_stream *xdr = &resp->xdr;
3802         __be32 *p;
3803
3804         p = xdr_reserve_space(xdr, 16);
3805         if (!p)
3806                 return nfserr_resource;
3807         if (nfserr) {
3808                 *p++ = cpu_to_be32(3);
3809                 *p++ = cpu_to_be32(0);
3810                 *p++ = cpu_to_be32(0);
3811                 *p++ = cpu_to_be32(0);
3812         }
3813         else {
3814                 *p++ = cpu_to_be32(3);
3815                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3816                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3817                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3818         }
3819         return nfserr;
3820 }
3821
3822 static __be32
3823 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3824 {
3825         struct xdr_stream *xdr = &resp->xdr;
3826         __be32 *p;
3827
3828         if (!nfserr) {
3829                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3830                 if (!p)
3831                         return nfserr_resource;
3832                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3833                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3834                                                 NFS4_VERIFIER_SIZE);
3835         }
3836         else if (nfserr == nfserr_clid_inuse) {
3837                 p = xdr_reserve_space(xdr, 8);
3838                 if (!p)
3839                         return nfserr_resource;
3840                 *p++ = cpu_to_be32(0);
3841                 *p++ = cpu_to_be32(0);
3842         }
3843         return nfserr;
3844 }
3845
3846 static __be32
3847 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3848 {
3849         struct xdr_stream *xdr = &resp->xdr;
3850         __be32 *p;
3851
3852         if (!nfserr) {
3853                 p = xdr_reserve_space(xdr, 16);
3854                 if (!p)
3855                         return nfserr_resource;
3856                 *p++ = cpu_to_be32(write->wr_bytes_written);
3857                 *p++ = cpu_to_be32(write->wr_how_written);
3858                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3859                                                         NFS4_VERIFIER_SIZE);
3860         }
3861         return nfserr;
3862 }
3863
3864 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3865         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3866               1 << (OP_EXCHANGE_ID - 32) |
3867               1 << (OP_CREATE_SESSION - 32) |
3868               1 << (OP_DESTROY_SESSION - 32) |
3869               1 << (OP_DESTROY_CLIENTID - 32)
3870 };
3871
3872 static __be32
3873 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3874                          struct nfsd4_exchange_id *exid)
3875 {
3876         struct xdr_stream *xdr = &resp->xdr;
3877         __be32 *p;
3878         char *major_id;
3879         char *server_scope;
3880         int major_id_sz;
3881         int server_scope_sz;
3882         uint64_t minor_id = 0;
3883
3884         if (nfserr)
3885                 return nfserr;
3886
3887         major_id = utsname()->nodename;
3888         major_id_sz = strlen(major_id);
3889         server_scope = utsname()->nodename;
3890         server_scope_sz = strlen(server_scope);
3891
3892         p = xdr_reserve_space(xdr,
3893                 8 /* eir_clientid */ +
3894                 4 /* eir_sequenceid */ +
3895                 4 /* eir_flags */ +
3896                 4 /* spr_how */);
3897         if (!p)
3898                 return nfserr_resource;
3899
3900         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3901         *p++ = cpu_to_be32(exid->seqid);
3902         *p++ = cpu_to_be32(exid->flags);
3903
3904         *p++ = cpu_to_be32(exid->spa_how);
3905
3906         switch (exid->spa_how) {
3907         case SP4_NONE:
3908                 break;
3909         case SP4_MACH_CRED:
3910                 /* spo_must_enforce, spo_must_allow */
3911                 p = xdr_reserve_space(xdr, 16);
3912                 if (!p)
3913                         return nfserr_resource;
3914
3915                 /* spo_must_enforce bitmap: */
3916                 *p++ = cpu_to_be32(2);
3917                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3918                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3919                 /* empty spo_must_allow bitmap: */
3920                 *p++ = cpu_to_be32(0);
3921
3922                 break;
3923         default:
3924                 WARN_ON_ONCE(1);
3925         }
3926
3927         p = xdr_reserve_space(xdr,
3928                 8 /* so_minor_id */ +
3929                 4 /* so_major_id.len */ +
3930                 (XDR_QUADLEN(major_id_sz) * 4) +
3931                 4 /* eir_server_scope.len */ +
3932                 (XDR_QUADLEN(server_scope_sz) * 4) +
3933                 4 /* eir_server_impl_id.count (0) */);
3934         if (!p)
3935                 return nfserr_resource;
3936
3937         /* The server_owner struct */
3938         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3939         /* major id */
3940         p = xdr_encode_opaque(p, major_id, major_id_sz);
3941
3942         /* Server scope */
3943         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3944
3945         /* Implementation id */
3946         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3947         return 0;
3948 }
3949
3950 static __be32
3951 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3952                             struct nfsd4_create_session *sess)
3953 {
3954         struct xdr_stream *xdr = &resp->xdr;
3955         __be32 *p;
3956
3957         if (nfserr)
3958                 return nfserr;
3959
3960         p = xdr_reserve_space(xdr, 24);
3961         if (!p)
3962                 return nfserr_resource;
3963         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3964                                         NFS4_MAX_SESSIONID_LEN);
3965         *p++ = cpu_to_be32(sess->seqid);
3966         *p++ = cpu_to_be32(sess->flags);
3967
3968         p = xdr_reserve_space(xdr, 28);
3969         if (!p)
3970                 return nfserr_resource;
3971         *p++ = cpu_to_be32(0); /* headerpadsz */
3972         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3973         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3974         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3975         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3976         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3977         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3978
3979         if (sess->fore_channel.nr_rdma_attrs) {
3980                 p = xdr_reserve_space(xdr, 4);
3981                 if (!p)
3982                         return nfserr_resource;
3983                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3984         }
3985
3986         p = xdr_reserve_space(xdr, 28);
3987         if (!p)
3988                 return nfserr_resource;
3989         *p++ = cpu_to_be32(0); /* headerpadsz */
3990         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3991         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3992         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3993         *p++ = cpu_to_be32(sess->back_channel.maxops);
3994         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3995         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3996
3997         if (sess->back_channel.nr_rdma_attrs) {
3998                 p = xdr_reserve_space(xdr, 4);
3999                 if (!p)
4000                         return nfserr_resource;
4001                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4002         }
4003         return 0;
4004 }
4005
4006 static __be32
4007 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4008                       struct nfsd4_sequence *seq)
4009 {
4010         struct xdr_stream *xdr = &resp->xdr;
4011         __be32 *p;
4012
4013         if (nfserr)
4014                 return nfserr;
4015
4016         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4017         if (!p)
4018                 return nfserr_resource;
4019         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4020                                         NFS4_MAX_SESSIONID_LEN);
4021         *p++ = cpu_to_be32(seq->seqid);
4022         *p++ = cpu_to_be32(seq->slotid);
4023         /* Note slotid's are numbered from zero: */
4024         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4025         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4026         *p++ = cpu_to_be32(seq->status_flags);
4027
4028         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4029         return 0;
4030 }
4031
4032 static __be32
4033 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4034                           struct nfsd4_test_stateid *test_stateid)
4035 {
4036         struct xdr_stream *xdr = &resp->xdr;
4037         struct nfsd4_test_stateid_id *stateid, *next;
4038         __be32 *p;
4039
4040         if (nfserr)
4041                 return nfserr;
4042
4043         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4044         if (!p)
4045                 return nfserr_resource;
4046         *p++ = htonl(test_stateid->ts_num_ids);
4047
4048         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4049                 *p++ = stateid->ts_id_status;
4050         }
4051
4052         return nfserr;
4053 }
4054
4055 #ifdef CONFIG_NFSD_PNFS
4056 static __be32
4057 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4058                 struct nfsd4_getdeviceinfo *gdev)
4059 {
4060         struct xdr_stream *xdr = &resp->xdr;
4061         const struct nfsd4_layout_ops *ops =
4062                 nfsd4_layout_ops[gdev->gd_layout_type];
4063         u32 starting_len = xdr->buf->len, needed_len;
4064         __be32 *p;
4065
4066         dprintk("%s: err %d\n", __func__, nfserr);
4067         if (nfserr)
4068                 goto out;
4069
4070         nfserr = nfserr_resource;
4071         p = xdr_reserve_space(xdr, 4);
4072         if (!p)
4073                 goto out;
4074
4075         *p++ = cpu_to_be32(gdev->gd_layout_type);
4076
4077         /* If maxcount is 0 then just update notifications */
4078         if (gdev->gd_maxcount != 0) {
4079                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4080                 if (nfserr) {
4081                         /*
4082                          * We don't bother to burden the layout drivers with
4083                          * enforcing gd_maxcount, just tell the client to
4084                          * come back with a bigger buffer if it's not enough.
4085                          */
4086                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4087                                 goto toosmall;
4088                         goto out;
4089                 }
4090         }
4091
4092         nfserr = nfserr_resource;
4093         if (gdev->gd_notify_types) {
4094                 p = xdr_reserve_space(xdr, 4 + 4);
4095                 if (!p)
4096                         goto out;
4097                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4098                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4099         } else {
4100                 p = xdr_reserve_space(xdr, 4);
4101                 if (!p)
4102                         goto out;
4103                 *p++ = 0;
4104         }
4105
4106         nfserr = 0;
4107 out:
4108         kfree(gdev->gd_device);
4109         dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4110         return nfserr;
4111
4112 toosmall:
4113         dprintk("%s: maxcount too small\n", __func__);
4114         needed_len = xdr->buf->len + 4 /* notifications */;
4115         xdr_truncate_encode(xdr, starting_len);
4116         p = xdr_reserve_space(xdr, 4);
4117         if (!p) {
4118                 nfserr = nfserr_resource;
4119         } else {
4120                 *p++ = cpu_to_be32(needed_len);
4121                 nfserr = nfserr_toosmall;
4122         }
4123         goto out;
4124 }
4125
4126 static __be32
4127 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4128                 struct nfsd4_layoutget *lgp)
4129 {
4130         struct xdr_stream *xdr = &resp->xdr;
4131         const struct nfsd4_layout_ops *ops =
4132                 nfsd4_layout_ops[lgp->lg_layout_type];
4133         __be32 *p;
4134
4135         dprintk("%s: err %d\n", __func__, nfserr);
4136         if (nfserr)
4137                 goto out;
4138
4139         nfserr = nfserr_resource;
4140         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4141         if (!p)
4142                 goto out;
4143
4144         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4145         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4146         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4147                                     sizeof(stateid_opaque_t));
4148
4149         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4150         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4151         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4152         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4153         *p++ = cpu_to_be32(lgp->lg_layout_type);
4154
4155         nfserr = ops->encode_layoutget(xdr, lgp);
4156 out:
4157         kfree(lgp->lg_content);
4158         return nfserr;
4159 }
4160
4161 static __be32
4162 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4163                           struct nfsd4_layoutcommit *lcp)
4164 {
4165         struct xdr_stream *xdr = &resp->xdr;
4166         __be32 *p;
4167
4168         if (nfserr)
4169                 return nfserr;
4170
4171         p = xdr_reserve_space(xdr, 4);
4172         if (!p)
4173                 return nfserr_resource;
4174         *p++ = cpu_to_be32(lcp->lc_size_chg);
4175         if (lcp->lc_size_chg) {
4176                 p = xdr_reserve_space(xdr, 8);
4177                 if (!p)
4178                         return nfserr_resource;
4179                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4180         }
4181
4182         return nfs_ok;
4183 }
4184
4185 static __be32
4186 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4187                 struct nfsd4_layoutreturn *lrp)
4188 {
4189         struct xdr_stream *xdr = &resp->xdr;
4190         __be32 *p;
4191
4192         if (nfserr)
4193                 return nfserr;
4194
4195         p = xdr_reserve_space(xdr, 4);
4196         if (!p)
4197                 return nfserr_resource;
4198         *p++ = cpu_to_be32(lrp->lrs_present);
4199         if (lrp->lrs_present)
4200                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4201         return nfs_ok;
4202 }
4203 #endif /* CONFIG_NFSD_PNFS */
4204
4205 static __be32
4206 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4207                   struct nfsd4_seek *seek)
4208 {
4209         __be32 *p;
4210
4211         if (nfserr)
4212                 return nfserr;
4213
4214         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4215         *p++ = cpu_to_be32(seek->seek_eof);
4216         p = xdr_encode_hyper(p, seek->seek_pos);
4217
4218         return nfserr;
4219 }
4220
4221 static __be32
4222 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4223 {
4224         return nfserr;
4225 }
4226
4227 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4228
4229 /*
4230  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4231  * since we don't need to filter out obsolete ops as this is
4232  * done in the decoding phase.
4233  */
4234 static nfsd4_enc nfsd4_enc_ops[] = {
4235         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4236         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4237         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4238         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4239         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4240         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4241         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4242         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4243         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4244         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4245         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4246         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4247         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4248         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4249         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4250         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4251         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4252         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4253         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4254         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4255         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4256         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4257         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4258         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4259         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4260         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4261         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4262         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4263         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4264         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4265         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4266         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4267         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4268         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4269         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4270         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4271         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4272
4273         /* NFSv4.1 operations */
4274         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4275         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4276         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4277         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4278         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4279         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4280         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4281 #ifdef CONFIG_NFSD_PNFS
4282         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4283         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4284         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4285         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4286         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4287 #else
4288         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4289         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4290         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4291         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4292         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4293 #endif
4294         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4295         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4296         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4297         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4298         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4299         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4300         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4301
4302         /* NFSv4.2 operations */
4303         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4304         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_noop,
4305         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4306         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4307         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4308         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4309         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4310         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4311         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4312         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4313         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4314         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4315         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4316 };
4317
4318 /*
4319  * Calculate whether we still have space to encode repsize bytes.
4320  * There are two considerations:
4321  *     - For NFS versions >=4.1, the size of the reply must stay within
4322  *       session limits
4323  *     - For all NFS versions, we must stay within limited preallocated
4324  *       buffer space.
4325  *
4326  * This is called before the operation is processed, so can only provide
4327  * an upper estimate.  For some nonidempotent operations (such as
4328  * getattr), it's not necessarily a problem if that estimate is wrong,
4329  * as we can fail it after processing without significant side effects.
4330  */
4331 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4332 {
4333         struct xdr_buf *buf = &resp->rqstp->rq_res;
4334         struct nfsd4_slot *slot = resp->cstate.slot;
4335
4336         if (buf->len + respsize <= buf->buflen)
4337                 return nfs_ok;
4338         if (!nfsd4_has_session(&resp->cstate))
4339                 return nfserr_resource;
4340         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4341                 WARN_ON_ONCE(1);
4342                 return nfserr_rep_too_big_to_cache;
4343         }
4344         return nfserr_rep_too_big;
4345 }
4346
4347 void
4348 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4349 {
4350         struct xdr_stream *xdr = &resp->xdr;
4351         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4352         struct svc_rqst *rqstp = resp->rqstp;
4353         int post_err_offset;
4354         nfsd4_enc encoder;
4355         __be32 *p;
4356
4357         p = xdr_reserve_space(xdr, 8);
4358         if (!p) {
4359                 WARN_ON_ONCE(1);
4360                 return;
4361         }
4362         *p++ = cpu_to_be32(op->opnum);
4363         post_err_offset = xdr->buf->len;
4364
4365         if (op->opnum == OP_ILLEGAL)
4366                 goto status;
4367         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4368                !nfsd4_enc_ops[op->opnum]);
4369         encoder = nfsd4_enc_ops[op->opnum];
4370         op->status = encoder(resp, op->status, &op->u);
4371         xdr_commit_encode(xdr);
4372
4373         /* nfsd4_check_resp_size guarantees enough room for error status */
4374         if (!op->status) {
4375                 int space_needed = 0;
4376                 if (!nfsd4_last_compound_op(rqstp))
4377                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4378                 op->status = nfsd4_check_resp_size(resp, space_needed);
4379         }
4380         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4381                 struct nfsd4_slot *slot = resp->cstate.slot;
4382
4383                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4384                         op->status = nfserr_rep_too_big_to_cache;
4385                 else
4386                         op->status = nfserr_rep_too_big;
4387         }
4388         if (op->status == nfserr_resource ||
4389             op->status == nfserr_rep_too_big ||
4390             op->status == nfserr_rep_too_big_to_cache) {
4391                 /*
4392                  * The operation may have already been encoded or
4393                  * partially encoded.  No op returns anything additional
4394                  * in the case of one of these three errors, so we can
4395                  * just truncate back to after the status.  But it's a
4396                  * bug if we had to do this on a non-idempotent op:
4397                  */
4398                 warn_on_nonidempotent_op(op);
4399                 xdr_truncate_encode(xdr, post_err_offset);
4400         }
4401         if (so) {
4402                 int len = xdr->buf->len - post_err_offset;
4403
4404                 so->so_replay.rp_status = op->status;
4405                 so->so_replay.rp_buflen = len;
4406                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4407                                                 so->so_replay.rp_buf, len);
4408         }
4409 status:
4410         /* Note that op->status is already in network byte order: */
4411         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4412 }
4413
4414 /*
4415  * Encode the reply stored in the stateowner reply cache
4416  *
4417  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4418  * previously sent already encoded operation.
4419  */
4420 void
4421 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4422 {
4423         __be32 *p;
4424         struct nfs4_replay *rp = op->replay;
4425
4426         BUG_ON(!rp);
4427
4428         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4429         if (!p) {
4430                 WARN_ON_ONCE(1);
4431                 return;
4432         }
4433         *p++ = cpu_to_be32(op->opnum);
4434         *p++ = rp->rp_status;  /* already xdr'ed */
4435
4436         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4437 }
4438
4439 int
4440 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4441 {
4442         return xdr_ressize_check(rqstp, p);
4443 }
4444
4445 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4446 {
4447         struct svc_rqst *rqstp = rq;
4448         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4449
4450         if (args->ops != args->iops) {
4451                 kfree(args->ops);
4452                 args->ops = args->iops;
4453         }
4454         kfree(args->tmpp);
4455         args->tmpp = NULL;
4456         while (args->to_free) {
4457                 struct svcxdr_tmpbuf *tb = args->to_free;
4458                 args->to_free = tb->next;
4459                 kfree(tb);
4460         }
4461         return 1;
4462 }
4463
4464 int
4465 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4466 {
4467         if (rqstp->rq_arg.head[0].iov_len % 4) {
4468                 /* client is nuts */
4469                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4470                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4471                 return 0;
4472         }
4473         args->p = p;
4474         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4475         args->pagelist = rqstp->rq_arg.pages;
4476         args->pagelen = rqstp->rq_arg.page_len;
4477         args->tmpp = NULL;
4478         args->to_free = NULL;
4479         args->ops = args->iops;
4480         args->rqstp = rqstp;
4481
4482         return !nfsd4_decode_compound(args);
4483 }
4484
4485 int
4486 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4487 {
4488         /*
4489          * All that remains is to write the tag and operation count...
4490          */
4491         struct xdr_buf *buf = resp->xdr.buf;
4492
4493         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4494                                  buf->tail[0].iov_len);
4495
4496         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4497
4498         p = resp->tagp;
4499         *p++ = htonl(resp->taglen);
4500         memcpy(p, resp->tag, resp->taglen);
4501         p += XDR_QUADLEN(resp->taglen);
4502         *p++ = htonl(resp->opcnt);
4503
4504         nfsd4_sequence_done(resp);
4505         return 1;
4506 }
4507
4508 /*
4509  * Local variables:
4510  *  c-basic-offset: 8
4511  * End:
4512  */