fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 #include <linux/file.h>
  37 #include <linux/slab.h>
  38 #include <linux/namei.h>
  39 #include <linux/statfs.h>
  40 #include <linux/utsname.h>
  41 #include <linux/pagemap.h>
  42 #include <linux/sunrpc/svcauth_gss.h>
  43
  44 #include "idmap.h"
  45 #include "acl.h"
  46 #include "xdr4.h"
  47 #include "vfs.h"
  48 #include "state.h"
  49 #include "cache.h"
  50 #include "netns.h"
  51 #include "pnfs.h"
  52
  53 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  54 #include <linux/security.h>
  55 #endif
  56
  57
  58 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  59
  60 /*
  61  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  62  * directory in order to indicate to the client that a filesystem boundary is present
  63  * We use a fixed fsid for a referral
  64  */
  65 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  66 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  67
  68 static __be32
  69 check_filename(char *str, int len)
  70 {
  71         int i;
  72
  73         if (len == 0)
  74                 return nfserr_inval;
  75         if (isdotent(str, len))
  76                 return nfserr_badname;
  77         for (i = 0; i < len; i++)
  78                 if (str[i] == '/')
  79                         return nfserr_badname;
  80         return 0;
  81 }
  82
  83 #define DECODE_HEAD                             \
  84         __be32 *p;                              \
  85         __be32 status
  86 #define DECODE_TAIL                             \
  87         status = 0;                             \
  88 out:                                            \
  89         return status;                          \
  90 xdr_error:                                      \
  91         dprintk("NFSD: xdr error (%s:%d)\n",    \
  92                         __FILE__, __LINE__);    \
  93         status = nfserr_bad_xdr;                \
  94         goto out
  95
  96 #define READMEM(x,nbytes) do {                  \
  97         x = (char *)p;                          \
  98         p += XDR_QUADLEN(nbytes);               \
  99 } while (0)
 100 #define SAVEMEM(x,nbytes) do {                  \
 101         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 102                 savemem(argp, p, nbytes) :      \
 103                 (char *)p)) {                   \
 104                 dprintk("NFSD: xdr error (%s:%d)\n", \
 105                                 __FILE__, __LINE__); \
 106                 goto xdr_error;                 \
 107                 }                               \
 108         p += XDR_QUADLEN(nbytes);               \
 109 } while (0)
 110 #define COPYMEM(x,nbytes) do {                  \
 111         memcpy((x), p, nbytes);                 \
 112         p += XDR_QUADLEN(nbytes);               \
 113 } while (0)
 114
 115 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 116 #define READ_BUF(nbytes)  do {                  \
 117         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 118                 p = argp->p;                    \
 119                 argp->p += XDR_QUADLEN(nbytes); \
 120         } else if (!(p = read_buf(argp, nbytes))) { \
 121                 dprintk("NFSD: xdr error (%s:%d)\n", \
 122                                 __FILE__, __LINE__); \
 123                 goto xdr_error;                 \
 124         }                                       \
 125 } while (0)
 126
 127 static void next_decode_page(struct nfsd4_compoundargs *argp)
 128 {
 129         argp->p = page_address(argp->pagelist[0]);
 130         argp->pagelist++;
 131         if (argp->pagelen < PAGE_SIZE) {
 132                 argp->end = argp->p + (argp->pagelen>>2);
 133                 argp->pagelen = 0;
 134         } else {
 135                 argp->end = argp->p + (PAGE_SIZE>>2);
 136                 argp->pagelen -= PAGE_SIZE;
 137         }
 138 }
 139
 140 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 141 {
 142         /* We want more bytes than seem to be available.
 143          * Maybe we need a new page, maybe we have just run out
 144          */
 145         unsigned int avail = (char *)argp->end - (char *)argp->p;
 146         __be32 *p;
 147         if (avail + argp->pagelen < nbytes)
 148                 return NULL;
 149         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 150                 return NULL;
 151         /* ok, we can do it with the current plus the next page */
 152         if (nbytes <= sizeof(argp->tmp))
 153                 p = argp->tmp;
 154         else {
 155                 kfree(argp->tmpp);
 156                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 157                 if (!p)
 158                         return NULL;
 159
 160         }
 161         /*
 162          * The following memcpy is safe because read_buf is always
 163          * called with nbytes > avail, and the two cases above both
 164          * guarantee p points to at least nbytes bytes.
 165          */
 166         memcpy(p, argp->p, avail);
 167         next_decode_page(argp);
 168         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 169         argp->p += XDR_QUADLEN(nbytes - avail);
 170         return p;
 171 }
 172
 173 static int zero_clientid(clientid_t *clid)
 174 {
 175         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 176 }
 177
 178 /**
 179  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 180  * @argp: NFSv4 compound argument structure
 181  * @p: pointer to be freed (with kfree())
 182  *
 183  * Marks @p to be freed when processing the compound operation
 184  * described in @argp finishes.
 185  */
 186 static void *
 187 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 188 {
 189         struct svcxdr_tmpbuf *tb;
 190
 191         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 192         if (!tb)
 193                 return NULL;
 194         tb->next = argp->to_free;
 195         argp->to_free = tb;
 196         return tb->buf;
 197 }
 198
 199 /*
 200  * For xdr strings that need to be passed to other kernel api's
 201  * as null-terminated strings.
 202  *
 203  * Note null-terminating in place usually isn't safe since the
 204  * buffer might end on a page boundary.
 205  */
 206 static char *
 207 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 208 {
 209         char *p = svcxdr_tmpalloc(argp, len + 1);
 210
 211         if (!p)
 212                 return NULL;
 213         memcpy(p, buf, len);
 214         p[len] = '\0';
 215         return p;
 216 }
 217
 218 /**
 219  * savemem - duplicate a chunk of memory for later processing
 220  * @argp: NFSv4 compound argument structure to be freed with
 221  * @p: pointer to be duplicated
 222  * @nbytes: length to be duplicated
 223  *
 224  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 225  * that are preserved until processing of the NFSv4 compound
 226  * operation described by @argp finishes.
 227  */
 228 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 229 {
 230         void *ret;
 231
 232         ret = svcxdr_tmpalloc(argp, nbytes);
 233         if (!ret)
 234                 return NULL;
 235         memcpy(ret, p, nbytes);
 236         return ret;
 237 }
 238
 239 /*
 240  * We require the high 32 bits of 'seconds' to be 0, and
 241  * we ignore all 32 bits of 'nseconds'.
 242  */
 243 static __be32
 244 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
 245 {
 246         DECODE_HEAD;
 247         u64 sec;
 248
 249         READ_BUF(12);
 250         p = xdr_decode_hyper(p, &sec);
 251         tv->tv_sec = sec;
 252         tv->tv_nsec = be32_to_cpup(p++);
 253         if (tv->tv_nsec >= (u32)1000000000)
 254                 return nfserr_inval;
 255
 256         DECODE_TAIL;
 257 }
 258
 259 static __be32
 260 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 261 {
 262         u32 bmlen;
 263         DECODE_HEAD;
 264
 265         bmval[0] = 0;
 266         bmval[1] = 0;
 267         bmval[2] = 0;
 268
 269         READ_BUF(4);
 270         bmlen = be32_to_cpup(p++);
 271         if (bmlen > 1000)
 272                 goto xdr_error;
 273
 274         READ_BUF(bmlen << 2);
 275         if (bmlen > 0)
 276                 bmval[0] = be32_to_cpup(p++);
 277         if (bmlen > 1)
 278                 bmval[1] = be32_to_cpup(p++);
 279         if (bmlen > 2)
 280                 bmval[2] = be32_to_cpup(p++);
 281
 282         DECODE_TAIL;
 283 }
 284
 285 static __be32
 286 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 287                    struct iattr *iattr, struct nfs4_acl **acl,
 288                    struct xdr_netobj *label)
 289 {
 290         int expected_len, len = 0;
 291         u32 dummy32;
 292         char *buf;
 293
 294         DECODE_HEAD;
 295         iattr->ia_valid = 0;
 296         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 297                 return status;
 298
 299         READ_BUF(4);
 300         expected_len = be32_to_cpup(p++);
 301
 302         if (bmval[0] & FATTR4_WORD0_SIZE) {
 303                 READ_BUF(8);
 304                 len += 8;
 305                 p = xdr_decode_hyper(p, &iattr->ia_size);
 306                 iattr->ia_valid |= ATTR_SIZE;
 307         }
 308         if (bmval[0] & FATTR4_WORD0_ACL) {
 309                 u32 nace;
 310                 struct nfs4_ace *ace;
 311
 312                 READ_BUF(4); len += 4;
 313                 nace = be32_to_cpup(p++);
 314
 315                 if (nace > NFS4_ACL_MAX)
 316                         return nfserr_fbig;
 317
 318                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
 319                 if (*acl == NULL)
 320                         return nfserr_jukebox;
 321
 322                 (*acl)->naces = nace;
 323                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 324                         READ_BUF(16); len += 16;
 325                         ace->type = be32_to_cpup(p++);
 326                         ace->flag = be32_to_cpup(p++);
 327                         ace->access_mask = be32_to_cpup(p++);
 328                         dummy32 = be32_to_cpup(p++);
 329                         READ_BUF(dummy32);
 330                         len += XDR_QUADLEN(dummy32) << 2;
 331                         READMEM(buf, dummy32);
 332                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 333                         status = nfs_ok;
 334                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 335                                 ;
 336                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 337                                 status = nfsd_map_name_to_gid(argp->rqstp,
 338                                                 buf, dummy32, &ace->who_gid);
 339                         else
 340                                 status = nfsd_map_name_to_uid(argp->rqstp,
 341                                                 buf, dummy32, &ace->who_uid);
 342                         if (status)
 343                                 return status;
 344                 }
 345         } else
 346                 *acl = NULL;
 347         if (bmval[1] & FATTR4_WORD1_MODE) {
 348                 READ_BUF(4);
 349                 len += 4;
 350                 iattr->ia_mode = be32_to_cpup(p++);
 351                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 352                 iattr->ia_valid |= ATTR_MODE;
 353         }
 354         if (bmval[1] & FATTR4_WORD1_OWNER) {
 355                 READ_BUF(4);
 356                 len += 4;
 357                 dummy32 = be32_to_cpup(p++);
 358                 READ_BUF(dummy32);
 359                 len += (XDR_QUADLEN(dummy32) << 2);
 360                 READMEM(buf, dummy32);
 361                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 362                         return status;
 363                 iattr->ia_valid |= ATTR_UID;
 364         }
 365         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 366                 READ_BUF(4);
 367                 len += 4;
 368                 dummy32 = be32_to_cpup(p++);
 369                 READ_BUF(dummy32);
 370                 len += (XDR_QUADLEN(dummy32) << 2);
 371                 READMEM(buf, dummy32);
 372                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 373                         return status;
 374                 iattr->ia_valid |= ATTR_GID;
 375         }
 376         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 377                 READ_BUF(4);
 378                 len += 4;
 379                 dummy32 = be32_to_cpup(p++);
 380                 switch (dummy32) {
 381                 case NFS4_SET_TO_CLIENT_TIME:
 382                         len += 12;
 383                         status = nfsd4_decode_time(argp, &iattr->ia_atime);
 384                         if (status)
 385                                 return status;
 386                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 387                         break;
 388                 case NFS4_SET_TO_SERVER_TIME:
 389                         iattr->ia_valid |= ATTR_ATIME;
 390                         break;
 391                 default:
 392                         goto xdr_error;
 393                 }
 394         }
 395         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 396                 READ_BUF(4);
 397                 len += 4;
 398                 dummy32 = be32_to_cpup(p++);
 399                 switch (dummy32) {
 400                 case NFS4_SET_TO_CLIENT_TIME:
 401                         len += 12;
 402                         status = nfsd4_decode_time(argp, &iattr->ia_mtime);
 403                         if (status)
 404                                 return status;
 405                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 406                         break;
 407                 case NFS4_SET_TO_SERVER_TIME:
 408                         iattr->ia_valid |= ATTR_MTIME;
 409                         break;
 410                 default:
 411                         goto xdr_error;
 412                 }
 413         }
 414
 415         label->len = 0;
 416 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 417         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 418                 READ_BUF(4);
 419                 len += 4;
 420                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 421                 READ_BUF(4);
 422                 len += 4;
 423                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 424                 READ_BUF(4);
 425                 len += 4;
 426                 dummy32 = be32_to_cpup(p++);
 427                 READ_BUF(dummy32);
 428                 if (dummy32 > NFS4_MAXLABELLEN)
 429                         return nfserr_badlabel;
 430                 len += (XDR_QUADLEN(dummy32) << 2);
 431                 READMEM(buf, dummy32);
 432                 label->len = dummy32;
 433                 label->data = svcxdr_dupstr(argp, buf, dummy32);
 434                 if (!label->data)
 435                         return nfserr_jukebox;
 436         }
 437 #endif
 438
 439         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 440             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 441             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 442                 READ_BUF(expected_len - len);
 443         else if (len != expected_len)
 444                 goto xdr_error;
 445
 446         DECODE_TAIL;
 447 }
 448
 449 static __be32
 450 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 451 {
 452         DECODE_HEAD;
 453
 454         READ_BUF(sizeof(stateid_t));
 455         sid->si_generation = be32_to_cpup(p++);
 456         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 457
 458         DECODE_TAIL;
 459 }
 460
 461 static __be32
 462 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 463 {
 464         DECODE_HEAD;
 465
 466         READ_BUF(4);
 467         access->ac_req_access = be32_to_cpup(p++);
 468
 469         DECODE_TAIL;
 470 }
 471
 472 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 473 {
 474         DECODE_HEAD;
 475         u32 dummy, uid, gid;
 476         char *machine_name;
 477         int i;
 478         int nr_secflavs;
 479
 480         /* callback_sec_params4 */
 481         READ_BUF(4);
 482         nr_secflavs = be32_to_cpup(p++);
 483         if (nr_secflavs)
 484                 cbs->flavor = (u32)(-1);
 485         else
 486                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 487                 cbs->flavor = 0;
 488         for (i = 0; i < nr_secflavs; ++i) {
 489                 READ_BUF(4);
 490                 dummy = be32_to_cpup(p++);
 491                 switch (dummy) {
 492                 case RPC_AUTH_NULL:
 493                         /* Nothing to read */
 494                         if (cbs->flavor == (u32)(-1))
 495                                 cbs->flavor = RPC_AUTH_NULL;
 496                         break;
 497                 case RPC_AUTH_UNIX:
 498                         READ_BUF(8);
 499                         /* stamp */
 500                         dummy = be32_to_cpup(p++);
 501
 502                         /* machine name */
 503                         dummy = be32_to_cpup(p++);
 504                         READ_BUF(dummy);
 505                         SAVEMEM(machine_name, dummy);
 506
 507                         /* uid, gid */
 508                         READ_BUF(8);
 509                         uid = be32_to_cpup(p++);
 510                         gid = be32_to_cpup(p++);
 511
 512                         /* more gids */
 513                         READ_BUF(4);
 514                         dummy = be32_to_cpup(p++);
 515                         READ_BUF(dummy * 4);
 516                         if (cbs->flavor == (u32)(-1)) {
 517                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 518                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 519                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 520                                         cbs->uid = kuid;
 521                                         cbs->gid = kgid;
 522                                         cbs->flavor = RPC_AUTH_UNIX;
 523                                 } else {
 524                                         dprintk("RPC_AUTH_UNIX with invalid"
 525                                                 "uid or gid ignoring!\n");
 526                                 }
 527                         }
 528                         break;
 529                 case RPC_AUTH_GSS:
 530                         dprintk("RPC_AUTH_GSS callback secflavor "
 531                                 "not supported!\n");
 532                         READ_BUF(8);
 533                         /* gcbp_service */
 534                         dummy = be32_to_cpup(p++);
 535                         /* gcbp_handle_from_server */
 536                         dummy = be32_to_cpup(p++);
 537                         READ_BUF(dummy);
 538                         p += XDR_QUADLEN(dummy);
 539                         /* gcbp_handle_from_client */
 540                         READ_BUF(4);
 541                         dummy = be32_to_cpup(p++);
 542                         READ_BUF(dummy);
 543                         break;
 544                 default:
 545                         dprintk("Illegal callback secflavor\n");
 546                         return nfserr_inval;
 547                 }
 548         }
 549         DECODE_TAIL;
 550 }
 551
 552 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 553 {
 554         DECODE_HEAD;
 555
 556         READ_BUF(4);
 557         bc->bc_cb_program = be32_to_cpup(p++);
 558         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 559
 560         DECODE_TAIL;
 561 }
 562
 563 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 564 {
 565         DECODE_HEAD;
 566
 567         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 568         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 569         bcts->dir = be32_to_cpup(p++);
 570         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 571          * could help us figure out we should be using it. */
 572         DECODE_TAIL;
 573 }
 574
 575 static __be32
 576 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 577 {
 578         DECODE_HEAD;
 579
 580         READ_BUF(4);
 581         close->cl_seqid = be32_to_cpup(p++);
 582         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 583
 584         DECODE_TAIL;
 585 }
 586
 587
 588 static __be32
 589 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 590 {
 591         DECODE_HEAD;
 592
 593         READ_BUF(12);
 594         p = xdr_decode_hyper(p, &commit->co_offset);
 595         commit->co_count = be32_to_cpup(p++);
 596
 597         DECODE_TAIL;
 598 }
 599
 600 static __be32
 601 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 602 {
 603         DECODE_HEAD;
 604
 605         READ_BUF(4);
 606         create->cr_type = be32_to_cpup(p++);
 607         switch (create->cr_type) {
 608         case NF4LNK:
 609                 READ_BUF(4);
 610                 create->cr_datalen = be32_to_cpup(p++);
 611                 READ_BUF(create->cr_datalen);
 612                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 613                 if (!create->cr_data)
 614                         return nfserr_jukebox;
 615                 break;
 616         case NF4BLK:
 617         case NF4CHR:
 618                 READ_BUF(8);
 619                 create->cr_specdata1 = be32_to_cpup(p++);
 620                 create->cr_specdata2 = be32_to_cpup(p++);
 621                 break;
 622         case NF4SOCK:
 623         case NF4FIFO:
 624         case NF4DIR:
 625         default:
 626                 break;
 627         }
 628
 629         READ_BUF(4);
 630         create->cr_namelen = be32_to_cpup(p++);
 631         READ_BUF(create->cr_namelen);
 632         SAVEMEM(create->cr_name, create->cr_namelen);
 633         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 634                 return status;
 635
 636         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 637                                     &create->cr_acl, &create->cr_label);
 638         if (status)
 639                 goto out;
 640
 641         DECODE_TAIL;
 642 }
 643
 644 static inline __be32
 645 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 646 {
 647         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 648 }
 649
 650 static inline __be32
 651 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 652 {
 653         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 654 }
 655
 656 static __be32
 657 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 658 {
 659         DECODE_HEAD;
 660
 661         READ_BUF(4);
 662         link->li_namelen = be32_to_cpup(p++);
 663         READ_BUF(link->li_namelen);
 664         SAVEMEM(link->li_name, link->li_namelen);
 665         if ((status = check_filename(link->li_name, link->li_namelen)))
 666                 return status;
 667
 668         DECODE_TAIL;
 669 }
 670
 671 static __be32
 672 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 673 {
 674         DECODE_HEAD;
 675
 676         /*
 677         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 678         */
 679         READ_BUF(28);
 680         lock->lk_type = be32_to_cpup(p++);
 681         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 682                 goto xdr_error;
 683         lock->lk_reclaim = be32_to_cpup(p++);
 684         p = xdr_decode_hyper(p, &lock->lk_offset);
 685         p = xdr_decode_hyper(p, &lock->lk_length);
 686         lock->lk_is_new = be32_to_cpup(p++);
 687
 688         if (lock->lk_is_new) {
 689                 READ_BUF(4);
 690                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 691                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 692                 if (status)
 693                         return status;
 694                 READ_BUF(8 + sizeof(clientid_t));
 695                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 696                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 697                 lock->lk_new_owner.len = be32_to_cpup(p++);
 698                 READ_BUF(lock->lk_new_owner.len);
 699                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 700         } else {
 701                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 702                 if (status)
 703                         return status;
 704                 READ_BUF(4);
 705                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 706         }
 707
 708         DECODE_TAIL;
 709 }
 710
 711 static __be32
 712 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 713 {
 714         DECODE_HEAD;
 715
 716         READ_BUF(32);
 717         lockt->lt_type = be32_to_cpup(p++);
 718         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 719                 goto xdr_error;
 720         p = xdr_decode_hyper(p, &lockt->lt_offset);
 721         p = xdr_decode_hyper(p, &lockt->lt_length);
 722         COPYMEM(&lockt->lt_clientid, 8);
 723         lockt->lt_owner.len = be32_to_cpup(p++);
 724         READ_BUF(lockt->lt_owner.len);
 725         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 726
 727         DECODE_TAIL;
 728 }
 729
 730 static __be32
 731 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 732 {
 733         DECODE_HEAD;
 734
 735         READ_BUF(8);
 736         locku->lu_type = be32_to_cpup(p++);
 737         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 738                 goto xdr_error;
 739         locku->lu_seqid = be32_to_cpup(p++);
 740         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 741         if (status)
 742                 return status;
 743         READ_BUF(16);
 744         p = xdr_decode_hyper(p, &locku->lu_offset);
 745         p = xdr_decode_hyper(p, &locku->lu_length);
 746
 747         DECODE_TAIL;
 748 }
 749
 750 static __be32
 751 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 752 {
 753         DECODE_HEAD;
 754
 755         READ_BUF(4);
 756         lookup->lo_len = be32_to_cpup(p++);
 757         READ_BUF(lookup->lo_len);
 758         SAVEMEM(lookup->lo_name, lookup->lo_len);
 759         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 760                 return status;
 761
 762         DECODE_TAIL;
 763 }
 764
 765 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 766 {
 767         __be32 *p;
 768         u32 w;
 769
 770         READ_BUF(4);
 771         w = be32_to_cpup(p++);
 772         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 773         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 774         if (deleg_when)
 775                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 776
 777         switch (w & NFS4_SHARE_ACCESS_MASK) {
 778         case NFS4_SHARE_ACCESS_READ:
 779         case NFS4_SHARE_ACCESS_WRITE:
 780         case NFS4_SHARE_ACCESS_BOTH:
 781                 break;
 782         default:
 783                 return nfserr_bad_xdr;
 784         }
 785         w &= ~NFS4_SHARE_ACCESS_MASK;
 786         if (!w)
 787                 return nfs_ok;
 788         if (!argp->minorversion)
 789                 return nfserr_bad_xdr;
 790         switch (w & NFS4_SHARE_WANT_MASK) {
 791         case NFS4_SHARE_WANT_NO_PREFERENCE:
 792         case NFS4_SHARE_WANT_READ_DELEG:
 793         case NFS4_SHARE_WANT_WRITE_DELEG:
 794         case NFS4_SHARE_WANT_ANY_DELEG:
 795         case NFS4_SHARE_WANT_NO_DELEG:
 796         case NFS4_SHARE_WANT_CANCEL:
 797                 break;
 798         default:
 799                 return nfserr_bad_xdr;
 800         }
 801         w &= ~NFS4_SHARE_WANT_MASK;
 802         if (!w)
 803                 return nfs_ok;
 804
 805         if (!deleg_when)        /* open_downgrade */
 806                 return nfserr_inval;
 807         switch (w) {
 808         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 809         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 810         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 811               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 812                 return nfs_ok;
 813         }
 814 xdr_error:
 815         return nfserr_bad_xdr;
 816 }
 817
 818 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 819 {
 820         __be32 *p;
 821
 822         READ_BUF(4);
 823         *x = be32_to_cpup(p++);
 824         /* Note: unlinke access bits, deny bits may be zero. */
 825         if (*x & ~NFS4_SHARE_DENY_BOTH)
 826                 return nfserr_bad_xdr;
 827         return nfs_ok;
 828 xdr_error:
 829         return nfserr_bad_xdr;
 830 }
 831
 832 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 833 {
 834         __be32 *p;
 835
 836         READ_BUF(4);
 837         o->len = be32_to_cpup(p++);
 838
 839         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 840                 return nfserr_bad_xdr;
 841
 842         READ_BUF(o->len);
 843         SAVEMEM(o->data, o->len);
 844         return nfs_ok;
 845 xdr_error:
 846         return nfserr_bad_xdr;
 847 }
 848
 849 static __be32
 850 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 851 {
 852         DECODE_HEAD;
 853         u32 dummy;
 854
 855         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 856         open->op_iattr.ia_valid = 0;
 857         open->op_openowner = NULL;
 858
 859         open->op_xdr_error = 0;
 860         /* seqid, share_access, share_deny, clientid, ownerlen */
 861         READ_BUF(4);
 862         open->op_seqid = be32_to_cpup(p++);
 863         /* decode, yet ignore deleg_when until supported */
 864         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 865                                            &open->op_deleg_want, &dummy);
 866         if (status)
 867                 goto xdr_error;
 868         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 869         if (status)
 870                 goto xdr_error;
 871         READ_BUF(sizeof(clientid_t));
 872         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 873         status = nfsd4_decode_opaque(argp, &open->op_owner);
 874         if (status)
 875                 goto xdr_error;
 876         READ_BUF(4);
 877         open->op_create = be32_to_cpup(p++);
 878         switch (open->op_create) {
 879         case NFS4_OPEN_NOCREATE:
 880                 break;
 881         case NFS4_OPEN_CREATE:
 882                 READ_BUF(4);
 883                 open->op_createmode = be32_to_cpup(p++);
 884                 switch (open->op_createmode) {
 885                 case NFS4_CREATE_UNCHECKED:
 886                 case NFS4_CREATE_GUARDED:
 887                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 888                                 &open->op_iattr, &open->op_acl, &open->op_label);
 889                         if (status)
 890                                 goto out;
 891                         break;
 892                 case NFS4_CREATE_EXCLUSIVE:
 893                         READ_BUF(NFS4_VERIFIER_SIZE);
 894                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 895                         break;
 896                 case NFS4_CREATE_EXCLUSIVE4_1:
 897                         if (argp->minorversion < 1)
 898                                 goto xdr_error;
 899                         READ_BUF(NFS4_VERIFIER_SIZE);
 900                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 901                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 902                                 &open->op_iattr, &open->op_acl, &open->op_label);
 903                         if (status)
 904                                 goto out;
 905                         break;
 906                 default:
 907                         goto xdr_error;
 908                 }
 909                 break;
 910         default:
 911                 goto xdr_error;
 912         }
 913
 914         /* open_claim */
 915         READ_BUF(4);
 916         open->op_claim_type = be32_to_cpup(p++);
 917         switch (open->op_claim_type) {
 918         case NFS4_OPEN_CLAIM_NULL:
 919         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 920                 READ_BUF(4);
 921                 open->op_fname.len = be32_to_cpup(p++);
 922                 READ_BUF(open->op_fname.len);
 923                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 924                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 925                         return status;
 926                 break;
 927         case NFS4_OPEN_CLAIM_PREVIOUS:
 928                 READ_BUF(4);
 929                 open->op_delegate_type = be32_to_cpup(p++);
 930                 break;
 931         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 932                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 933                 if (status)
 934                         return status;
 935                 READ_BUF(4);
 936                 open->op_fname.len = be32_to_cpup(p++);
 937                 READ_BUF(open->op_fname.len);
 938                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 939                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 940                         return status;
 941                 break;
 942         case NFS4_OPEN_CLAIM_FH:
 943         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 944                 if (argp->minorversion < 1)
 945                         goto xdr_error;
 946                 /* void */
 947                 break;
 948         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 949                 if (argp->minorversion < 1)
 950                         goto xdr_error;
 951                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 952                 if (status)
 953                         return status;
 954                 break;
 955         default:
 956                 goto xdr_error;
 957         }
 958
 959         DECODE_TAIL;
 960 }
 961
 962 static __be32
 963 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 964 {
 965         DECODE_HEAD;
 966
 967         if (argp->minorversion >= 1)
 968                 return nfserr_notsupp;
 969
 970         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 971         if (status)
 972                 return status;
 973         READ_BUF(4);
 974         open_conf->oc_seqid = be32_to_cpup(p++);
 975
 976         DECODE_TAIL;
 977 }
 978
 979 static __be32
 980 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 981 {
 982         DECODE_HEAD;
 983
 984         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 985         if (status)
 986                 return status;
 987         READ_BUF(4);
 988         open_down->od_seqid = be32_to_cpup(p++);
 989         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 990                                            &open_down->od_deleg_want, NULL);
 991         if (status)
 992                 return status;
 993         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 994         if (status)
 995                 return status;
 996         DECODE_TAIL;
 997 }
 998
 999 static __be32
1000 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1001 {
1002         DECODE_HEAD;
1003
1004         READ_BUF(4);
1005         putfh->pf_fhlen = be32_to_cpup(p++);
1006         if (putfh->pf_fhlen > NFS4_FHSIZE)
1007                 goto xdr_error;
1008         READ_BUF(putfh->pf_fhlen);
1009         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1010
1011         DECODE_TAIL;
1012 }
1013
1014 static __be32
1015 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1016 {
1017         if (argp->minorversion == 0)
1018                 return nfs_ok;
1019         return nfserr_notsupp;
1020 }
1021
1022 static __be32
1023 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1024 {
1025         DECODE_HEAD;
1026
1027         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1028         if (status)
1029                 return status;
1030         READ_BUF(12);
1031         p = xdr_decode_hyper(p, &read->rd_offset);
1032         read->rd_length = be32_to_cpup(p++);
1033
1034         DECODE_TAIL;
1035 }
1036
1037 static __be32
1038 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1039 {
1040         DECODE_HEAD;
1041
1042         READ_BUF(24);
1043         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1044         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1045         readdir->rd_dircount = be32_to_cpup(p++);
1046         readdir->rd_maxcount = be32_to_cpup(p++);
1047         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1048                 goto out;
1049
1050         DECODE_TAIL;
1051 }
1052
1053 static __be32
1054 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1055 {
1056         DECODE_HEAD;
1057
1058         READ_BUF(4);
1059         remove->rm_namelen = be32_to_cpup(p++);
1060         READ_BUF(remove->rm_namelen);
1061         SAVEMEM(remove->rm_name, remove->rm_namelen);
1062         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1063                 return status;
1064
1065         DECODE_TAIL;
1066 }
1067
1068 static __be32
1069 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1070 {
1071         DECODE_HEAD;
1072
1073         READ_BUF(4);
1074         rename->rn_snamelen = be32_to_cpup(p++);
1075         READ_BUF(rename->rn_snamelen);
1076         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1077         READ_BUF(4);
1078         rename->rn_tnamelen = be32_to_cpup(p++);
1079         READ_BUF(rename->rn_tnamelen);
1080         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1081         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1082                 return status;
1083         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1084                 return status;
1085
1086         DECODE_TAIL;
1087 }
1088
1089 static __be32
1090 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1091 {
1092         DECODE_HEAD;
1093
1094         if (argp->minorversion >= 1)
1095                 return nfserr_notsupp;
1096
1097         READ_BUF(sizeof(clientid_t));
1098         COPYMEM(clientid, sizeof(clientid_t));
1099
1100         DECODE_TAIL;
1101 }
1102
1103 static __be32
1104 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1105                      struct nfsd4_secinfo *secinfo)
1106 {
1107         DECODE_HEAD;
1108
1109         READ_BUF(4);
1110         secinfo->si_namelen = be32_to_cpup(p++);
1111         READ_BUF(secinfo->si_namelen);
1112         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1113         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1114         if (status)
1115                 return status;
1116         DECODE_TAIL;
1117 }
1118
1119 static __be32
1120 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1121                      struct nfsd4_secinfo_no_name *sin)
1122 {
1123         DECODE_HEAD;
1124
1125         READ_BUF(4);
1126         sin->sin_style = be32_to_cpup(p++);
1127         DECODE_TAIL;
1128 }
1129
1130 static __be32
1131 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1132 {
1133         __be32 status;
1134
1135         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1136         if (status)
1137                 return status;
1138         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1139                                   &setattr->sa_acl, &setattr->sa_label);
1140 }
1141
1142 static __be32
1143 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1144 {
1145         DECODE_HEAD;
1146
1147         if (argp->minorversion >= 1)
1148                 return nfserr_notsupp;
1149
1150         READ_BUF(NFS4_VERIFIER_SIZE);
1151         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1152
1153         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1154         if (status)
1155                 return nfserr_bad_xdr;
1156         READ_BUF(8);
1157         setclientid->se_callback_prog = be32_to_cpup(p++);
1158         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1159         READ_BUF(setclientid->se_callback_netid_len);
1160         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1161         READ_BUF(4);
1162         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1163
1164         READ_BUF(setclientid->se_callback_addr_len);
1165         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1166         READ_BUF(4);
1167         setclientid->se_callback_ident = be32_to_cpup(p++);
1168
1169         DECODE_TAIL;
1170 }
1171
1172 static __be32
1173 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1174 {
1175         DECODE_HEAD;
1176
1177         if (argp->minorversion >= 1)
1178                 return nfserr_notsupp;
1179
1180         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1181         COPYMEM(&scd_c->sc_clientid, 8);
1182         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1183
1184         DECODE_TAIL;
1185 }
1186
1187 /* Also used for NVERIFY */
1188 static __be32
1189 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1190 {
1191         DECODE_HEAD;
1192
1193         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1194                 goto out;
1195
1196         /* For convenience's sake, we compare raw xdr'd attributes in
1197          * nfsd4_proc_verify */
1198
1199         READ_BUF(4);
1200         verify->ve_attrlen = be32_to_cpup(p++);
1201         READ_BUF(verify->ve_attrlen);
1202         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1203
1204         DECODE_TAIL;
1205 }
1206
1207 static __be32
1208 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1209 {
1210         int avail;
1211         int len;
1212         DECODE_HEAD;
1213
1214         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1215         if (status)
1216                 return status;
1217         READ_BUF(16);
1218         p = xdr_decode_hyper(p, &write->wr_offset);
1219         write->wr_stable_how = be32_to_cpup(p++);
1220         if (write->wr_stable_how > 2)
1221                 goto xdr_error;
1222         write->wr_buflen = be32_to_cpup(p++);
1223
1224         /* Sorry .. no magic macros for this.. *
1225          * READ_BUF(write->wr_buflen);
1226          * SAVEMEM(write->wr_buf, write->wr_buflen);
1227          */
1228         avail = (char*)argp->end - (char*)argp->p;
1229         if (avail + argp->pagelen < write->wr_buflen) {
1230                 dprintk("NFSD: xdr error (%s:%d)\n",
1231                                 __FILE__, __LINE__);
1232                 goto xdr_error;
1233         }
1234         write->wr_head.iov_base = p;
1235         write->wr_head.iov_len = avail;
1236         write->wr_pagelist = argp->pagelist;
1237
1238         len = XDR_QUADLEN(write->wr_buflen) << 2;
1239         if (len >= avail) {
1240                 int pages;
1241
1242                 len -= avail;
1243
1244                 pages = len >> PAGE_SHIFT;
1245                 argp->pagelist += pages;
1246                 argp->pagelen -= pages * PAGE_SIZE;
1247                 len -= pages * PAGE_SIZE;
1248
1249                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1250                 argp->pagelist++;
1251                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1252         }
1253         argp->p += XDR_QUADLEN(len);
1254
1255         DECODE_TAIL;
1256 }
1257
1258 static __be32
1259 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1260 {
1261         DECODE_HEAD;
1262
1263         if (argp->minorversion >= 1)
1264                 return nfserr_notsupp;
1265
1266         READ_BUF(12);
1267         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1268         rlockowner->rl_owner.len = be32_to_cpup(p++);
1269         READ_BUF(rlockowner->rl_owner.len);
1270         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1271
1272         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1273                 return nfserr_inval;
1274         DECODE_TAIL;
1275 }
1276
1277 static __be32
1278 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1279                          struct nfsd4_exchange_id *exid)
1280 {
1281         int dummy, tmp;
1282         DECODE_HEAD;
1283
1284         READ_BUF(NFS4_VERIFIER_SIZE);
1285         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1286
1287         status = nfsd4_decode_opaque(argp, &exid->clname);
1288         if (status)
1289                 return nfserr_bad_xdr;
1290
1291         READ_BUF(4);
1292         exid->flags = be32_to_cpup(p++);
1293
1294         /* Ignore state_protect4_a */
1295         READ_BUF(4);
1296         exid->spa_how = be32_to_cpup(p++);
1297         switch (exid->spa_how) {
1298         case SP4_NONE:
1299                 break;
1300         case SP4_MACH_CRED:
1301                 /* spo_must_enforce */
1302                 READ_BUF(4);
1303                 dummy = be32_to_cpup(p++);
1304                 READ_BUF(dummy * 4);
1305                 p += dummy;
1306
1307                 /* spo_must_allow */
1308                 READ_BUF(4);
1309                 dummy = be32_to_cpup(p++);
1310                 READ_BUF(dummy * 4);
1311                 p += dummy;
1312                 break;
1313         case SP4_SSV:
1314                 /* ssp_ops */
1315                 READ_BUF(4);
1316                 dummy = be32_to_cpup(p++);
1317                 READ_BUF(dummy * 4);
1318                 p += dummy;
1319
1320                 READ_BUF(4);
1321                 dummy = be32_to_cpup(p++);
1322                 READ_BUF(dummy * 4);
1323                 p += dummy;
1324
1325                 /* ssp_hash_algs<> */
1326                 READ_BUF(4);
1327                 tmp = be32_to_cpup(p++);
1328                 while (tmp--) {
1329                         READ_BUF(4);
1330                         dummy = be32_to_cpup(p++);
1331                         READ_BUF(dummy);
1332                         p += XDR_QUADLEN(dummy);
1333                 }
1334
1335                 /* ssp_encr_algs<> */
1336                 READ_BUF(4);
1337                 tmp = be32_to_cpup(p++);
1338                 while (tmp--) {
1339                         READ_BUF(4);
1340                         dummy = be32_to_cpup(p++);
1341                         READ_BUF(dummy);
1342                         p += XDR_QUADLEN(dummy);
1343                 }
1344
1345                 /* ssp_window and ssp_num_gss_handles */
1346                 READ_BUF(8);
1347                 dummy = be32_to_cpup(p++);
1348                 dummy = be32_to_cpup(p++);
1349                 break;
1350         default:
1351                 goto xdr_error;
1352         }
1353
1354         /* Ignore Implementation ID */
1355         READ_BUF(4);    /* nfs_impl_id4 array length */
1356         dummy = be32_to_cpup(p++);
1357
1358         if (dummy > 1)
1359                 goto xdr_error;
1360
1361         if (dummy == 1) {
1362                 /* nii_domain */
1363                 READ_BUF(4);
1364                 dummy = be32_to_cpup(p++);
1365                 READ_BUF(dummy);
1366                 p += XDR_QUADLEN(dummy);
1367
1368                 /* nii_name */
1369                 READ_BUF(4);
1370                 dummy = be32_to_cpup(p++);
1371                 READ_BUF(dummy);
1372                 p += XDR_QUADLEN(dummy);
1373
1374                 /* nii_date */
1375                 READ_BUF(12);
1376                 p += 3;
1377         }
1378         DECODE_TAIL;
1379 }
1380
1381 static __be32
1382 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1383                             struct nfsd4_create_session *sess)
1384 {
1385         DECODE_HEAD;
1386         u32 dummy;
1387
1388         READ_BUF(16);
1389         COPYMEM(&sess->clientid, 8);
1390         sess->seqid = be32_to_cpup(p++);
1391         sess->flags = be32_to_cpup(p++);
1392
1393         /* Fore channel attrs */
1394         READ_BUF(28);
1395         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1396         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1397         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1398         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1399         sess->fore_channel.maxops = be32_to_cpup(p++);
1400         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1401         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1402         if (sess->fore_channel.nr_rdma_attrs == 1) {
1403                 READ_BUF(4);
1404                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1405         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1406                 dprintk("Too many fore channel attr bitmaps!\n");
1407                 goto xdr_error;
1408         }
1409
1410         /* Back channel attrs */
1411         READ_BUF(28);
1412         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1413         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1414         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1415         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1416         sess->back_channel.maxops = be32_to_cpup(p++);
1417         sess->back_channel.maxreqs = be32_to_cpup(p++);
1418         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1419         if (sess->back_channel.nr_rdma_attrs == 1) {
1420                 READ_BUF(4);
1421                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1422         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1423                 dprintk("Too many back channel attr bitmaps!\n");
1424                 goto xdr_error;
1425         }
1426
1427         READ_BUF(4);
1428         sess->callback_prog = be32_to_cpup(p++);
1429         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1430         DECODE_TAIL;
1431 }
1432
1433 static __be32
1434 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1435                              struct nfsd4_destroy_session *destroy_session)
1436 {
1437         DECODE_HEAD;
1438         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1439         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1440
1441         DECODE_TAIL;
1442 }
1443
1444 static __be32
1445 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1446                           struct nfsd4_free_stateid *free_stateid)
1447 {
1448         DECODE_HEAD;
1449
1450         READ_BUF(sizeof(stateid_t));
1451         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1452         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1453
1454         DECODE_TAIL;
1455 }
1456
1457 static __be32
1458 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1459                       struct nfsd4_sequence *seq)
1460 {
1461         DECODE_HEAD;
1462
1463         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1464         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1465         seq->seqid = be32_to_cpup(p++);
1466         seq->slotid = be32_to_cpup(p++);
1467         seq->maxslots = be32_to_cpup(p++);
1468         seq->cachethis = be32_to_cpup(p++);
1469
1470         DECODE_TAIL;
1471 }
1472
1473 static __be32
1474 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1475 {
1476         int i;
1477         __be32 *p, status;
1478         struct nfsd4_test_stateid_id *stateid;
1479
1480         READ_BUF(4);
1481         test_stateid->ts_num_ids = ntohl(*p++);
1482
1483         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1484
1485         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1486                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1487                 if (!stateid) {
1488                         status = nfserrno(-ENOMEM);
1489                         goto out;
1490                 }
1491
1492                 INIT_LIST_HEAD(&stateid->ts_id_list);
1493                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1494
1495                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1496                 if (status)
1497                         goto out;
1498         }
1499
1500         status = 0;
1501 out:
1502         return status;
1503 xdr_error:
1504         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1505         status = nfserr_bad_xdr;
1506         goto out;
1507 }
1508
1509 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1510 {
1511         DECODE_HEAD;
1512
1513         READ_BUF(8);
1514         COPYMEM(&dc->clientid, 8);
1515
1516         DECODE_TAIL;
1517 }
1518
1519 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1520 {
1521         DECODE_HEAD;
1522
1523         READ_BUF(4);
1524         rc->rca_one_fs = be32_to_cpup(p++);
1525
1526         DECODE_TAIL;
1527 }
1528
1529 #ifdef CONFIG_NFSD_PNFS
1530 static __be32
1531 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1532                 struct nfsd4_getdeviceinfo *gdev)
1533 {
1534         DECODE_HEAD;
1535         u32 num, i;
1536
1537         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1538         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1539         gdev->gd_layout_type = be32_to_cpup(p++);
1540         gdev->gd_maxcount = be32_to_cpup(p++);
1541         num = be32_to_cpup(p++);
1542         if (num) {
1543                 READ_BUF(4 * num);
1544                 gdev->gd_notify_types = be32_to_cpup(p++);
1545                 for (i = 1; i < num; i++) {
1546                         if (be32_to_cpup(p++)) {
1547                                 status = nfserr_inval;
1548                                 goto out;
1549                         }
1550                 }
1551         }
1552         DECODE_TAIL;
1553 }
1554
1555 static __be32
1556 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1557                 struct nfsd4_layoutget *lgp)
1558 {
1559         DECODE_HEAD;
1560
1561         READ_BUF(36);
1562         lgp->lg_signal = be32_to_cpup(p++);
1563         lgp->lg_layout_type = be32_to_cpup(p++);
1564         lgp->lg_seg.iomode = be32_to_cpup(p++);
1565         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1566         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1567         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1568
1569         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1570         if (status)
1571                 return status;
1572
1573         READ_BUF(4);
1574         lgp->lg_maxcount = be32_to_cpup(p++);
1575
1576         DECODE_TAIL;
1577 }
1578
1579 static __be32
1580 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1581                 struct nfsd4_layoutcommit *lcp)
1582 {
1583         DECODE_HEAD;
1584         u32 timechange;
1585
1586         READ_BUF(20);
1587         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1588         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1589         lcp->lc_reclaim = be32_to_cpup(p++);
1590
1591         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1592         if (status)
1593                 return status;
1594
1595         READ_BUF(4);
1596         lcp->lc_newoffset = be32_to_cpup(p++);
1597         if (lcp->lc_newoffset) {
1598                 READ_BUF(8);
1599                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1600         } else
1601                 lcp->lc_last_wr = 0;
1602         READ_BUF(4);
1603         timechange = be32_to_cpup(p++);
1604         if (timechange) {
1605                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1606                 if (status)
1607                         return status;
1608         } else {
1609                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1610         }
1611         READ_BUF(8);
1612         lcp->lc_layout_type = be32_to_cpup(p++);
1613
1614         /*
1615          * Save the layout update in XDR format and let the layout driver deal
1616          * with it later.
1617          */
1618         lcp->lc_up_len = be32_to_cpup(p++);
1619         if (lcp->lc_up_len > 0) {
1620                 READ_BUF(lcp->lc_up_len);
1621                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1622         }
1623
1624         DECODE_TAIL;
1625 }
1626
1627 static __be32
1628 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1629                 struct nfsd4_layoutreturn *lrp)
1630 {
1631         DECODE_HEAD;
1632
1633         READ_BUF(16);
1634         lrp->lr_reclaim = be32_to_cpup(p++);
1635         lrp->lr_layout_type = be32_to_cpup(p++);
1636         lrp->lr_seg.iomode = be32_to_cpup(p++);
1637         lrp->lr_return_type = be32_to_cpup(p++);
1638         if (lrp->lr_return_type == RETURN_FILE) {
1639                 READ_BUF(16);
1640                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1641                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1642
1643                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1644                 if (status)
1645                         return status;
1646
1647                 READ_BUF(4);
1648                 lrp->lrf_body_len = be32_to_cpup(p++);
1649                 if (lrp->lrf_body_len > 0) {
1650                         READ_BUF(lrp->lrf_body_len);
1651                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1652                 }
1653         } else {
1654                 lrp->lr_seg.offset = 0;
1655                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1656         }
1657
1658         DECODE_TAIL;
1659 }
1660 #endif /* CONFIG_NFSD_PNFS */
1661
1662 static __be32
1663 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1664                        struct nfsd4_fallocate *fallocate)
1665 {
1666         DECODE_HEAD;
1667
1668         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1669         if (status)
1670                 return status;
1671
1672         READ_BUF(16);
1673         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1674         xdr_decode_hyper(p, &fallocate->falloc_length);
1675
1676         DECODE_TAIL;
1677 }
1678
1679 static __be32
1680 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1681 {
1682         DECODE_HEAD;
1683
1684         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1685         if (status)
1686                 return status;
1687         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1688         if (status)
1689                 return status;
1690
1691         READ_BUF(8 + 8 + 8);
1692         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1693         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1694         p = xdr_decode_hyper(p, &clone->cl_count);
1695         DECODE_TAIL;
1696 }
1697
1698 static __be32
1699 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1700 {
1701         DECODE_HEAD;
1702
1703         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1704         if (status)
1705                 return status;
1706
1707         READ_BUF(8 + 4);
1708         p = xdr_decode_hyper(p, &seek->seek_offset);
1709         seek->seek_whence = be32_to_cpup(p);
1710
1711         DECODE_TAIL;
1712 }
1713
1714 static __be32
1715 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1716 {
1717         return nfs_ok;
1718 }
1719
1720 static __be32
1721 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1722 {
1723         return nfserr_notsupp;
1724 }
1725
1726 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1727
1728 static nfsd4_dec nfsd4_dec_ops[] = {
1729         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1730         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1731         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1732         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1733         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1734         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1735         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1736         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1737         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1738         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1739         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1740         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1741         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1742         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1743         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1744         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1745         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1746         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1747         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1748         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1749         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1750         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1751         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1752         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1753         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1754         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1755         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1756         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1757         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1758         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1759         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1760         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1761         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1762         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1763         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1764         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1765         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1766
1767         /* new operations for NFSv4.1 */
1768         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1769         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1770         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1771         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1772         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1773         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1774         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1775 #ifdef CONFIG_NFSD_PNFS
1776         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1777         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1778         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1779         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1780         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1781 #else
1782         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1783         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1784         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1785         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1786         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1787 #endif
1788         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1789         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1790         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1791         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1792         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1793         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1794         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1795
1796         /* new operations for NFSv4.2 */
1797         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1798         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_notsupp,
1799         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1800         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1801         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1802         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1803         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1804         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1805         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1806         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1807         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1808         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1809         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1810 };
1811
1812 static inline bool
1813 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1814 {
1815         if (op->opnum < FIRST_NFS4_OP)
1816                 return false;
1817         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1818                 return false;
1819         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1820                 return false;
1821         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1822                 return false;
1823         return true;
1824 }
1825
1826 static __be32
1827 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1828 {
1829         DECODE_HEAD;
1830         struct nfsd4_op *op;
1831         bool cachethis = false;
1832         int auth_slack= argp->rqstp->rq_auth_slack;
1833         int max_reply = auth_slack + 8; /* opcnt, status */
1834         int readcount = 0;
1835         int readbytes = 0;
1836         int i;
1837
1838         READ_BUF(4);
1839         argp->taglen = be32_to_cpup(p++);
1840         READ_BUF(argp->taglen);
1841         SAVEMEM(argp->tag, argp->taglen);
1842         READ_BUF(8);
1843         argp->minorversion = be32_to_cpup(p++);
1844         argp->opcnt = be32_to_cpup(p++);
1845         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1846
1847         if (argp->taglen > NFSD4_MAX_TAGLEN)
1848                 goto xdr_error;
1849         if (argp->opcnt > 100)
1850                 goto xdr_error;
1851
1852         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1853                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1854                 if (!argp->ops) {
1855                         argp->ops = argp->iops;
1856                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1857                         goto xdr_error;
1858                 }
1859         }
1860
1861         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1862                 argp->opcnt = 0;
1863
1864         for (i = 0; i < argp->opcnt; i++) {
1865                 op = &argp->ops[i];
1866                 op->replay = NULL;
1867
1868                 READ_BUF(4);
1869                 op->opnum = be32_to_cpup(p++);
1870
1871                 if (nfsd4_opnum_in_range(argp, op))
1872                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1873                 else {
1874                         op->opnum = OP_ILLEGAL;
1875                         op->status = nfserr_op_illegal;
1876                 }
1877                 /*
1878                  * We'll try to cache the result in the DRC if any one
1879                  * op in the compound wants to be cached:
1880                  */
1881                 cachethis |= nfsd4_cache_this_op(op);
1882
1883                 if (op->opnum == OP_READ) {
1884                         readcount++;
1885                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1886                 } else
1887                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1888                 /*
1889                  * OP_LOCK may return a conflicting lock.  (Special case
1890                  * because it will just skip encoding this if it runs
1891                  * out of xdr buffer space, and it is the only operation
1892                  * that behaves this way.)
1893                  */
1894                 if (op->opnum == OP_LOCK)
1895                         max_reply += NFS4_OPAQUE_LIMIT;
1896
1897                 if (op->status) {
1898                         argp->opcnt = i+1;
1899                         break;
1900                 }
1901         }
1902         /* Sessions make the DRC unnecessary: */
1903         if (argp->minorversion)
1904                 cachethis = false;
1905         svc_reserve(argp->rqstp, max_reply + readbytes);
1906         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1907
1908         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1909                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1910
1911         DECODE_TAIL;
1912 }
1913
1914 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1915 {
1916         if (IS_I_VERSION(inode)) {
1917                 p = xdr_encode_hyper(p, inode->i_version);
1918         } else {
1919                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1920                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1921         }
1922         return p;
1923 }
1924
1925 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1926 {
1927         *p++ = cpu_to_be32(c->atomic);
1928         if (c->change_supported) {
1929                 p = xdr_encode_hyper(p, c->before_change);
1930                 p = xdr_encode_hyper(p, c->after_change);
1931         } else {
1932                 *p++ = cpu_to_be32(c->before_ctime_sec);
1933                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1934                 *p++ = cpu_to_be32(c->after_ctime_sec);
1935                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1936         }
1937         return p;
1938 }
1939
1940 /* Encode as an array of strings the string given with components
1941  * separated @sep, escaped with esc_enter and esc_exit.
1942  */
1943 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1944                                           char *components, char esc_enter,
1945                                           char esc_exit)
1946 {
1947         __be32 *p;
1948         __be32 pathlen;
1949         int pathlen_offset;
1950         int strlen, count=0;
1951         char *str, *end, *next;
1952
1953         dprintk("nfsd4_encode_components(%s)\n", components);
1954
1955         pathlen_offset = xdr->buf->len;
1956         p = xdr_reserve_space(xdr, 4);
1957         if (!p)
1958                 return nfserr_resource;
1959         p++; /* We will fill this in with @count later */
1960
1961         end = str = components;
1962         while (*end) {
1963                 bool found_esc = false;
1964
1965                 /* try to parse as esc_start, ..., esc_end, sep */
1966                 if (*str == esc_enter) {
1967                         for (; *end && (*end != esc_exit); end++)
1968                                 /* find esc_exit or end of string */;
1969                         next = end + 1;
1970                         if (*end && (!*next || *next == sep)) {
1971                                 str++;
1972                                 found_esc = true;
1973                         }
1974                 }
1975
1976                 if (!found_esc)
1977                         for (; *end && (*end != sep); end++)
1978                                 /* find sep or end of string */;
1979
1980                 strlen = end - str;
1981                 if (strlen) {
1982                         p = xdr_reserve_space(xdr, strlen + 4);
1983                         if (!p)
1984                                 return nfserr_resource;
1985                         p = xdr_encode_opaque(p, str, strlen);
1986                         count++;
1987                 }
1988                 else
1989                         end++;
1990                 if (found_esc)
1991                         end = next;
1992
1993                 str = end;
1994         }
1995         pathlen = htonl(count);
1996         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1997         return 0;
1998 }
1999
2000 /* Encode as an array of strings the string given with components
2001  * separated @sep.
2002  */
2003 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2004                                       char *components)
2005 {
2006         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2007 }
2008
2009 /*
2010  * encode a location element of a fs_locations structure
2011  */
2012 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2013                                         struct nfsd4_fs_location *location)
2014 {
2015         __be32 status;
2016
2017         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2018                                                 '[', ']');
2019         if (status)
2020                 return status;
2021         status = nfsd4_encode_components(xdr, '/', location->path);
2022         if (status)
2023                 return status;
2024         return 0;
2025 }
2026
2027 /*
2028  * Encode a path in RFC3530 'pathname4' format
2029  */
2030 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2031                                 const struct path *root,
2032                                 const struct path *path)
2033 {
2034         struct path cur = *path;
2035         __be32 *p;
2036         struct dentry **components = NULL;
2037         unsigned int ncomponents = 0;
2038         __be32 err = nfserr_jukebox;
2039
2040         dprintk("nfsd4_encode_components(");
2041
2042         path_get(&cur);
2043         /* First walk the path up to the nfsd root, and store the
2044          * dentries/path components in an array.
2045          */
2046         for (;;) {
2047                 if (path_equal(&cur, root))
2048                         break;
2049                 if (cur.dentry == cur.mnt->mnt_root) {
2050                         if (follow_up(&cur))
2051                                 continue;
2052                         goto out_free;
2053                 }
2054                 if ((ncomponents & 15) == 0) {
2055                         struct dentry **new;
2056                         new = krealloc(components,
2057                                         sizeof(*new) * (ncomponents + 16),
2058                                         GFP_KERNEL);
2059                         if (!new)
2060                                 goto out_free;
2061                         components = new;
2062                 }
2063                 components[ncomponents++] = cur.dentry;
2064                 cur.dentry = dget_parent(cur.dentry);
2065         }
2066         err = nfserr_resource;
2067         p = xdr_reserve_space(xdr, 4);
2068         if (!p)
2069                 goto out_free;
2070         *p++ = cpu_to_be32(ncomponents);
2071
2072         while (ncomponents) {
2073                 struct dentry *dentry = components[ncomponents - 1];
2074                 unsigned int len;
2075
2076                 spin_lock(&dentry->d_lock);
2077                 len = dentry->d_name.len;
2078                 p = xdr_reserve_space(xdr, len + 4);
2079                 if (!p) {
2080                         spin_unlock(&dentry->d_lock);
2081                         goto out_free;
2082                 }
2083                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2084                 dprintk("/%pd", dentry);
2085                 spin_unlock(&dentry->d_lock);
2086                 dput(dentry);
2087                 ncomponents--;
2088         }
2089
2090         err = 0;
2091 out_free:
2092         dprintk(")\n");
2093         while (ncomponents)
2094                 dput(components[--ncomponents]);
2095         kfree(components);
2096         path_put(&cur);
2097         return err;
2098 }
2099
2100 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2101                         struct svc_rqst *rqstp, const struct path *path)
2102 {
2103         struct svc_export *exp_ps;
2104         __be32 res;
2105
2106         exp_ps = rqst_find_fsidzero_export(rqstp);
2107         if (IS_ERR(exp_ps))
2108                 return nfserrno(PTR_ERR(exp_ps));
2109         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2110         exp_put(exp_ps);
2111         return res;
2112 }
2113
2114 /*
2115  *  encode a fs_locations structure
2116  */
2117 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2118                         struct svc_rqst *rqstp, struct svc_export *exp)
2119 {
2120         __be32 status;
2121         int i;
2122         __be32 *p;
2123         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2124
2125         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2126         if (status)
2127                 return status;
2128         p = xdr_reserve_space(xdr, 4);
2129         if (!p)
2130                 return nfserr_resource;
2131         *p++ = cpu_to_be32(fslocs->locations_count);
2132         for (i=0; i<fslocs->locations_count; i++) {
2133                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2134                 if (status)
2135                         return status;
2136         }
2137         return 0;
2138 }
2139
2140 static u32 nfs4_file_type(umode_t mode)
2141 {
2142         switch (mode & S_IFMT) {
2143         case S_IFIFO:   return NF4FIFO;
2144         case S_IFCHR:   return NF4CHR;
2145         case S_IFDIR:   return NF4DIR;
2146         case S_IFBLK:   return NF4BLK;
2147         case S_IFLNK:   return NF4LNK;
2148         case S_IFREG:   return NF4REG;
2149         case S_IFSOCK:  return NF4SOCK;
2150         default:        return NF4BAD;
2151         };
2152 }
2153
2154 static inline __be32
2155 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2156                      struct nfs4_ace *ace)
2157 {
2158         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2159                 return nfs4_acl_write_who(xdr, ace->whotype);
2160         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2161                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2162         else
2163                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2164 }
2165
2166 static inline __be32
2167 nfsd4_encode_layout_type(struct xdr_stream *xdr, enum pnfs_layouttype layout_type)
2168 {
2169         __be32 *p;
2170
2171         if (layout_type) {
2172                 p = xdr_reserve_space(xdr, 8);
2173                 if (!p)
2174                         return nfserr_resource;
2175                 *p++ = cpu_to_be32(1);
2176                 *p++ = cpu_to_be32(layout_type);
2177         } else {
2178                 p = xdr_reserve_space(xdr, 4);
2179                 if (!p)
2180                         return nfserr_resource;
2181                 *p++ = cpu_to_be32(0);
2182         }
2183
2184         return 0;
2185 }
2186
2187 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2188                               FATTR4_WORD0_RDATTR_ERROR)
2189 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2190 #define WORD2_ABSENT_FS_ATTRS 0
2191
2192 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2193 static inline __be32
2194 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2195                             void *context, int len)
2196 {
2197         __be32 *p;
2198
2199         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2200         if (!p)
2201                 return nfserr_resource;
2202
2203         /*
2204          * For now we use a 0 here to indicate the null translation; in
2205          * the future we may place a call to translation code here.
2206          */
2207         *p++ = cpu_to_be32(0); /* lfs */
2208         *p++ = cpu_to_be32(0); /* pi */
2209         p = xdr_encode_opaque(p, context, len);
2210         return 0;
2211 }
2212 #else
2213 static inline __be32
2214 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2215                             void *context, int len)
2216 { return 0; }
2217 #endif
2218
2219 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2220 {
2221         /* As per referral draft:  */
2222         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2223             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2224                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2225                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2226                         *rdattr_err = NFSERR_MOVED;
2227                 else
2228                         return nfserr_moved;
2229         }
2230         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2231         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2232         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2233         return 0;
2234 }
2235
2236
2237 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2238 {
2239         struct path path = exp->ex_path;
2240         int err;
2241
2242         path_get(&path);
2243         while (follow_up(&path)) {
2244                 if (path.dentry != path.mnt->mnt_root)
2245                         break;
2246         }
2247         err = vfs_getattr(&path, stat);
2248         path_put(&path);
2249         return err;
2250 }
2251
2252 static __be32
2253 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2254 {
2255         __be32 *p;
2256
2257         if (bmval2) {
2258                 p = xdr_reserve_space(xdr, 16);
2259                 if (!p)
2260                         goto out_resource;
2261                 *p++ = cpu_to_be32(3);
2262                 *p++ = cpu_to_be32(bmval0);
2263                 *p++ = cpu_to_be32(bmval1);
2264                 *p++ = cpu_to_be32(bmval2);
2265         } else if (bmval1) {
2266                 p = xdr_reserve_space(xdr, 12);
2267                 if (!p)
2268                         goto out_resource;
2269                 *p++ = cpu_to_be32(2);
2270                 *p++ = cpu_to_be32(bmval0);
2271                 *p++ = cpu_to_be32(bmval1);
2272         } else {
2273                 p = xdr_reserve_space(xdr, 8);
2274                 if (!p)
2275                         goto out_resource;
2276                 *p++ = cpu_to_be32(1);
2277                 *p++ = cpu_to_be32(bmval0);
2278         }
2279
2280         return 0;
2281 out_resource:
2282         return nfserr_resource;
2283 }
2284
2285 /*
2286  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2287  * ourselves.
2288  */
2289 static __be32
2290 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2291                 struct svc_export *exp,
2292                 struct dentry *dentry, u32 *bmval,
2293                 struct svc_rqst *rqstp, int ignore_crossmnt)
2294 {
2295         u32 bmval0 = bmval[0];
2296         u32 bmval1 = bmval[1];
2297         u32 bmval2 = bmval[2];
2298         struct kstat stat;
2299         struct svc_fh *tempfh = NULL;
2300         struct kstatfs statfs;
2301         __be32 *p;
2302         int starting_len = xdr->buf->len;
2303         int attrlen_offset;
2304         __be32 attrlen;
2305         u32 dummy;
2306         u64 dummy64;
2307         u32 rdattr_err = 0;
2308         __be32 status;
2309         int err;
2310         struct nfs4_acl *acl = NULL;
2311         void *context = NULL;
2312         int contextlen;
2313         bool contextsupport = false;
2314         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2315         u32 minorversion = resp->cstate.minorversion;
2316         struct path path = {
2317                 .mnt    = exp->ex_path.mnt,
2318                 .dentry = dentry,
2319         };
2320         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2321
2322         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2323         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2324         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2325         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2326
2327         if (exp->ex_fslocs.migrated) {
2328                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2329                 if (status)
2330                         goto out;
2331         }
2332
2333         err = vfs_getattr(&path, &stat);
2334         if (err)
2335                 goto out_nfserr;
2336         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2337                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2338             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2339                        FATTR4_WORD1_SPACE_TOTAL))) {
2340                 err = vfs_statfs(&path, &statfs);
2341                 if (err)
2342                         goto out_nfserr;
2343         }
2344         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2345                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2346                 status = nfserr_jukebox;
2347                 if (!tempfh)
2348                         goto out;
2349                 fh_init(tempfh, NFS4_FHSIZE);
2350                 status = fh_compose(tempfh, exp, dentry, NULL);
2351                 if (status)
2352                         goto out;
2353                 fhp = tempfh;
2354         }
2355         if (bmval0 & FATTR4_WORD0_ACL) {
2356                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2357                 if (err == -EOPNOTSUPP)
2358                         bmval0 &= ~FATTR4_WORD0_ACL;
2359                 else if (err == -EINVAL) {
2360                         status = nfserr_attrnotsupp;
2361                         goto out;
2362                 } else if (err != 0)
2363                         goto out_nfserr;
2364         }
2365
2366 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2367         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2368              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2369                 err = security_inode_getsecctx(d_inode(dentry),
2370                                                 &context, &contextlen);
2371                 contextsupport = (err == 0);
2372                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2373                         if (err == -EOPNOTSUPP)
2374                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2375                         else if (err)
2376                                 goto out_nfserr;
2377                 }
2378         }
2379 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2380
2381         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2382         if (status)
2383                 goto out;
2384
2385         attrlen_offset = xdr->buf->len;
2386         p = xdr_reserve_space(xdr, 4);
2387         if (!p)
2388                 goto out_resource;
2389         p++;                /* to be backfilled later */
2390
2391         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2392                 u32 word0 = nfsd_suppattrs0(minorversion);
2393                 u32 word1 = nfsd_suppattrs1(minorversion);
2394                 u32 word2 = nfsd_suppattrs2(minorversion);
2395
2396                 if (!IS_POSIXACL(dentry->d_inode))
2397                         word0 &= ~FATTR4_WORD0_ACL;
2398                 if (!contextsupport)
2399                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2400                 if (!word2) {
2401                         p = xdr_reserve_space(xdr, 12);
2402                         if (!p)
2403                                 goto out_resource;
2404                         *p++ = cpu_to_be32(2);
2405                         *p++ = cpu_to_be32(word0);
2406                         *p++ = cpu_to_be32(word1);
2407                 } else {
2408                         p = xdr_reserve_space(xdr, 16);
2409                         if (!p)
2410                                 goto out_resource;
2411                         *p++ = cpu_to_be32(3);
2412                         *p++ = cpu_to_be32(word0);
2413                         *p++ = cpu_to_be32(word1);
2414                         *p++ = cpu_to_be32(word2);
2415                 }
2416         }
2417         if (bmval0 & FATTR4_WORD0_TYPE) {
2418                 p = xdr_reserve_space(xdr, 4);
2419                 if (!p)
2420                         goto out_resource;
2421                 dummy = nfs4_file_type(stat.mode);
2422                 if (dummy == NF4BAD) {
2423                         status = nfserr_serverfault;
2424                         goto out;
2425                 }
2426                 *p++ = cpu_to_be32(dummy);
2427         }
2428         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2429                 p = xdr_reserve_space(xdr, 4);
2430                 if (!p)
2431                         goto out_resource;
2432                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2433                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2434                 else
2435                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2436                                                 NFS4_FH_VOL_RENAME);
2437         }
2438         if (bmval0 & FATTR4_WORD0_CHANGE) {
2439                 p = xdr_reserve_space(xdr, 8);
2440                 if (!p)
2441                         goto out_resource;
2442                 p = encode_change(p, &stat, d_inode(dentry));
2443         }
2444         if (bmval0 & FATTR4_WORD0_SIZE) {
2445                 p = xdr_reserve_space(xdr, 8);
2446                 if (!p)
2447                         goto out_resource;
2448                 p = xdr_encode_hyper(p, stat.size);
2449         }
2450         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2451                 p = xdr_reserve_space(xdr, 4);
2452                 if (!p)
2453                         goto out_resource;
2454                 *p++ = cpu_to_be32(1);
2455         }
2456         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2457                 p = xdr_reserve_space(xdr, 4);
2458                 if (!p)
2459                         goto out_resource;
2460                 *p++ = cpu_to_be32(1);
2461         }
2462         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2463                 p = xdr_reserve_space(xdr, 4);
2464                 if (!p)
2465                         goto out_resource;
2466                 *p++ = cpu_to_be32(0);
2467         }
2468         if (bmval0 & FATTR4_WORD0_FSID) {
2469                 p = xdr_reserve_space(xdr, 16);
2470                 if (!p)
2471                         goto out_resource;
2472                 if (exp->ex_fslocs.migrated) {
2473                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2474                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2475                 } else switch(fsid_source(fhp)) {
2476                 case FSIDSOURCE_FSID:
2477                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2478                         p = xdr_encode_hyper(p, (u64)0);
2479                         break;
2480                 case FSIDSOURCE_DEV:
2481                         *p++ = cpu_to_be32(0);
2482                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2483                         *p++ = cpu_to_be32(0);
2484                         *p++ = cpu_to_be32(MINOR(stat.dev));
2485                         break;
2486                 case FSIDSOURCE_UUID:
2487                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2488                                                                 EX_UUID_LEN);
2489                         break;
2490                 }
2491         }
2492         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2493                 p = xdr_reserve_space(xdr, 4);
2494                 if (!p)
2495                         goto out_resource;
2496                 *p++ = cpu_to_be32(0);
2497         }
2498         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2499                 p = xdr_reserve_space(xdr, 4);
2500                 if (!p)
2501                         goto out_resource;
2502                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2503         }
2504         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2505                 p = xdr_reserve_space(xdr, 4);
2506                 if (!p)
2507                         goto out_resource;
2508                 *p++ = cpu_to_be32(rdattr_err);
2509         }
2510         if (bmval0 & FATTR4_WORD0_ACL) {
2511                 struct nfs4_ace *ace;
2512
2513                 if (acl == NULL) {
2514                         p = xdr_reserve_space(xdr, 4);
2515                         if (!p)
2516                                 goto out_resource;
2517
2518                         *p++ = cpu_to_be32(0);
2519                         goto out_acl;
2520                 }
2521                 p = xdr_reserve_space(xdr, 4);
2522                 if (!p)
2523                         goto out_resource;
2524                 *p++ = cpu_to_be32(acl->naces);
2525
2526                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2527                         p = xdr_reserve_space(xdr, 4*3);
2528                         if (!p)
2529                                 goto out_resource;
2530                         *p++ = cpu_to_be32(ace->type);
2531                         *p++ = cpu_to_be32(ace->flag);
2532                         *p++ = cpu_to_be32(ace->access_mask &
2533                                                         NFS4_ACE_MASK_ALL);
2534                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2535                         if (status)
2536                                 goto out;
2537                 }
2538         }
2539 out_acl:
2540         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2541                 p = xdr_reserve_space(xdr, 4);
2542                 if (!p)
2543                         goto out_resource;
2544                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2545                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2546         }
2547         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2548                 p = xdr_reserve_space(xdr, 4);
2549                 if (!p)
2550                         goto out_resource;
2551                 *p++ = cpu_to_be32(1);
2552         }
2553         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2554                 p = xdr_reserve_space(xdr, 4);
2555                 if (!p)
2556                         goto out_resource;
2557                 *p++ = cpu_to_be32(0);
2558         }
2559         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2560                 p = xdr_reserve_space(xdr, 4);
2561                 if (!p)
2562                         goto out_resource;
2563                 *p++ = cpu_to_be32(1);
2564         }
2565         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2566                 p = xdr_reserve_space(xdr, 4);
2567                 if (!p)
2568                         goto out_resource;
2569                 *p++ = cpu_to_be32(1);
2570         }
2571         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2572                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2573                 if (!p)
2574                         goto out_resource;
2575                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2576                                         fhp->fh_handle.fh_size);
2577         }
2578         if (bmval0 & FATTR4_WORD0_FILEID) {
2579                 p = xdr_reserve_space(xdr, 8);
2580                 if (!p)
2581                         goto out_resource;
2582                 p = xdr_encode_hyper(p, stat.ino);
2583         }
2584         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2585                 p = xdr_reserve_space(xdr, 8);
2586                 if (!p)
2587                         goto out_resource;
2588                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2589         }
2590         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2591                 p = xdr_reserve_space(xdr, 8);
2592                 if (!p)
2593                         goto out_resource;
2594                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2595         }
2596         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2597                 p = xdr_reserve_space(xdr, 8);
2598                 if (!p)
2599                         goto out_resource;
2600                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2601         }
2602         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2603                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2604                 if (status)
2605                         goto out;
2606         }
2607         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2608                 p = xdr_reserve_space(xdr, 4);
2609                 if (!p)
2610                         goto out_resource;
2611                 *p++ = cpu_to_be32(1);
2612         }
2613         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2614                 p = xdr_reserve_space(xdr, 8);
2615                 if (!p)
2616                         goto out_resource;
2617                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2618         }
2619         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2620                 p = xdr_reserve_space(xdr, 4);
2621                 if (!p)
2622                         goto out_resource;
2623                 *p++ = cpu_to_be32(255);
2624         }
2625         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2626                 p = xdr_reserve_space(xdr, 4);
2627                 if (!p)
2628                         goto out_resource;
2629                 *p++ = cpu_to_be32(statfs.f_namelen);
2630         }
2631         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2632                 p = xdr_reserve_space(xdr, 8);
2633                 if (!p)
2634                         goto out_resource;
2635                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2636         }
2637         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2638                 p = xdr_reserve_space(xdr, 8);
2639                 if (!p)
2640                         goto out_resource;
2641                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2642         }
2643         if (bmval1 & FATTR4_WORD1_MODE) {
2644                 p = xdr_reserve_space(xdr, 4);
2645                 if (!p)
2646                         goto out_resource;
2647                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2648         }
2649         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2650                 p = xdr_reserve_space(xdr, 4);
2651                 if (!p)
2652                         goto out_resource;
2653                 *p++ = cpu_to_be32(1);
2654         }
2655         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2656                 p = xdr_reserve_space(xdr, 4);
2657                 if (!p)
2658                         goto out_resource;
2659                 *p++ = cpu_to_be32(stat.nlink);
2660         }
2661         if (bmval1 & FATTR4_WORD1_OWNER) {
2662                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2663                 if (status)
2664                         goto out;
2665         }
2666         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2667                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2668                 if (status)
2669                         goto out;
2670         }
2671         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2672                 p = xdr_reserve_space(xdr, 8);
2673                 if (!p)
2674                         goto out_resource;
2675                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2676                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2677         }
2678         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2679                 p = xdr_reserve_space(xdr, 8);
2680                 if (!p)
2681                         goto out_resource;
2682                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2683                 p = xdr_encode_hyper(p, dummy64);
2684         }
2685         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2686                 p = xdr_reserve_space(xdr, 8);
2687                 if (!p)
2688                         goto out_resource;
2689                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2690                 p = xdr_encode_hyper(p, dummy64);
2691         }
2692         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2693                 p = xdr_reserve_space(xdr, 8);
2694                 if (!p)
2695                         goto out_resource;
2696                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2697                 p = xdr_encode_hyper(p, dummy64);
2698         }
2699         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2700                 p = xdr_reserve_space(xdr, 8);
2701                 if (!p)
2702                         goto out_resource;
2703                 dummy64 = (u64)stat.blocks << 9;
2704                 p = xdr_encode_hyper(p, dummy64);
2705         }
2706         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2707                 p = xdr_reserve_space(xdr, 12);
2708                 if (!p)
2709                         goto out_resource;
2710                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2711                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2712         }
2713         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2714                 p = xdr_reserve_space(xdr, 12);
2715                 if (!p)
2716                         goto out_resource;
2717                 *p++ = cpu_to_be32(0);
2718                 *p++ = cpu_to_be32(1);
2719                 *p++ = cpu_to_be32(0);
2720         }
2721         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2722                 p = xdr_reserve_space(xdr, 12);
2723                 if (!p)
2724                         goto out_resource;
2725                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2726                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2727         }
2728         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2729                 p = xdr_reserve_space(xdr, 12);
2730                 if (!p)
2731                         goto out_resource;
2732                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2733                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2734         }
2735         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2736                 struct kstat parent_stat;
2737                 u64 ino = stat.ino;
2738
2739                 p = xdr_reserve_space(xdr, 8);
2740                 if (!p)
2741                         goto out_resource;
2742                 /*
2743                  * Get parent's attributes if not ignoring crossmount
2744                  * and this is the root of a cross-mounted filesystem.
2745                  */
2746                 if (ignore_crossmnt == 0 &&
2747                     dentry == exp->ex_path.mnt->mnt_root) {
2748                         err = get_parent_attributes(exp, &parent_stat);
2749                         if (err)
2750                                 goto out_nfserr;
2751                         ino = parent_stat.ino;
2752                 }
2753                 p = xdr_encode_hyper(p, ino);
2754         }
2755 #ifdef CONFIG_NFSD_PNFS
2756         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2757                 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2758                 if (status)
2759                         goto out;
2760         }
2761
2762         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2763                 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2764                 if (status)
2765                         goto out;
2766         }
2767
2768         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2769                 p = xdr_reserve_space(xdr, 4);
2770                 if (!p)
2771                         goto out_resource;
2772                 *p++ = cpu_to_be32(stat.blksize);
2773         }
2774 #endif /* CONFIG_NFSD_PNFS */
2775         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2776                 status = nfsd4_encode_bitmap(xdr, NFSD_SUPPATTR_EXCLCREAT_WORD0,
2777                                                   NFSD_SUPPATTR_EXCLCREAT_WORD1,
2778                                                   NFSD_SUPPATTR_EXCLCREAT_WORD2);
2779                 if (status)
2780                         goto out;
2781         }
2782
2783         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2784                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2785                                                                 contextlen);
2786                 if (status)
2787                         goto out;
2788         }
2789
2790         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2791         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2792         status = nfs_ok;
2793
2794 out:
2795 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2796         if (context)
2797                 security_release_secctx(context, contextlen);
2798 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2799         kfree(acl);
2800         if (tempfh) {
2801                 fh_put(tempfh);
2802                 kfree(tempfh);
2803         }
2804         if (status)
2805                 xdr_truncate_encode(xdr, starting_len);
2806         return status;
2807 out_nfserr:
2808         status = nfserrno(err);
2809         goto out;
2810 out_resource:
2811         status = nfserr_resource;
2812         goto out;
2813 }
2814
2815 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2816                                 struct xdr_buf *buf, __be32 *p, int bytes)
2817 {
2818         xdr->scratch.iov_len = 0;
2819         memset(buf, 0, sizeof(struct xdr_buf));
2820         buf->head[0].iov_base = p;
2821         buf->head[0].iov_len = 0;
2822         buf->len = 0;
2823         xdr->buf = buf;
2824         xdr->iov = buf->head;
2825         xdr->p = p;
2826         xdr->end = (void *)p + bytes;
2827         buf->buflen = bytes;
2828 }
2829
2830 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2831                         struct svc_fh *fhp, struct svc_export *exp,
2832                         struct dentry *dentry, u32 *bmval,
2833                         struct svc_rqst *rqstp, int ignore_crossmnt)
2834 {
2835         struct xdr_buf dummy;
2836         struct xdr_stream xdr;
2837         __be32 ret;
2838
2839         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2840         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2841                                                         ignore_crossmnt);
2842         *p = xdr.p;
2843         return ret;
2844 }
2845
2846 static inline int attributes_need_mount(u32 *bmval)
2847 {
2848         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2849                 return 1;
2850         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2851                 return 1;
2852         return 0;
2853 }
2854
2855 static __be32
2856 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2857                         const char *name, int namlen)
2858 {
2859         struct svc_export *exp = cd->rd_fhp->fh_export;
2860         struct dentry *dentry;
2861         __be32 nfserr;
2862         int ignore_crossmnt = 0;
2863
2864         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2865         if (IS_ERR(dentry))
2866                 return nfserrno(PTR_ERR(dentry));
2867         if (d_really_is_negative(dentry)) {
2868                 /*
2869                  * we're not holding the i_mutex here, so there's
2870                  * a window where this directory entry could have gone
2871                  * away.
2872                  */
2873                 dput(dentry);
2874                 return nfserr_noent;
2875         }
2876
2877         exp_get(exp);
2878         /*
2879          * In the case of a mountpoint, the client may be asking for
2880          * attributes that are only properties of the underlying filesystem
2881          * as opposed to the cross-mounted file system. In such a case,
2882          * we will not follow the cross mount and will fill the attribtutes
2883          * directly from the mountpoint dentry.
2884          */
2885         if (nfsd_mountpoint(dentry, exp)) {
2886                 int err;
2887
2888                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2889                                 && !attributes_need_mount(cd->rd_bmval)) {
2890                         ignore_crossmnt = 1;
2891                         goto out_encode;
2892                 }
2893                 /*
2894                  * Why the heck aren't we just using nfsd_lookup??
2895                  * Different "."/".." handling?  Something else?
2896                  * At least, add a comment here to explain....
2897                  */
2898                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2899                 if (err) {
2900                         nfserr = nfserrno(err);
2901                         goto out_put;
2902                 }
2903                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2904                 if (nfserr)
2905                         goto out_put;
2906
2907         }
2908 out_encode:
2909         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2910                                         cd->rd_rqstp, ignore_crossmnt);
2911 out_put:
2912         dput(dentry);
2913         exp_put(exp);
2914         return nfserr;
2915 }
2916
2917 static __be32 *
2918 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2919 {
2920         __be32 *p;
2921
2922         p = xdr_reserve_space(xdr, 20);
2923         if (!p)
2924                 return NULL;
2925         *p++ = htonl(2);
2926         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2927         *p++ = htonl(0);                         /* bmval1 */
2928
2929         *p++ = htonl(4);     /* attribute length */
2930         *p++ = nfserr;       /* no htonl */
2931         return p;
2932 }
2933
2934 static int
2935 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2936                     loff_t offset, u64 ino, unsigned int d_type)
2937 {
2938         struct readdir_cd *ccd = ccdv;
2939         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2940         struct xdr_stream *xdr = cd->xdr;
2941         int start_offset = xdr->buf->len;
2942         int cookie_offset;
2943         u32 name_and_cookie;
2944         int entry_bytes;
2945         __be32 nfserr = nfserr_toosmall;
2946         __be64 wire_offset;
2947         __be32 *p;
2948
2949         /* In nfsv4, "." and ".." never make it onto the wire.. */
2950         if (name && isdotent(name, namlen)) {
2951                 cd->common.err = nfs_ok;
2952                 return 0;
2953         }
2954
2955         if (cd->cookie_offset) {
2956                 wire_offset = cpu_to_be64(offset);
2957                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2958                                                         &wire_offset, 8);
2959         }
2960
2961         p = xdr_reserve_space(xdr, 4);
2962         if (!p)
2963                 goto fail;
2964         *p++ = xdr_one;                             /* mark entry present */
2965         cookie_offset = xdr->buf->len;
2966         p = xdr_reserve_space(xdr, 3*4 + namlen);
2967         if (!p)
2968                 goto fail;
2969         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2970         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2971
2972         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2973         switch (nfserr) {
2974         case nfs_ok:
2975                 break;
2976         case nfserr_resource:
2977                 nfserr = nfserr_toosmall;
2978                 goto fail;
2979         case nfserr_noent:
2980                 xdr_truncate_encode(xdr, start_offset);
2981                 goto skip_entry;
2982         default:
2983                 /*
2984                  * If the client requested the RDATTR_ERROR attribute,
2985                  * we stuff the error code into this attribute
2986                  * and continue.  If this attribute was not requested,
2987                  * then in accordance with the spec, we fail the
2988                  * entire READDIR operation(!)
2989                  */
2990                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2991                         goto fail;
2992                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2993                 if (p == NULL) {
2994                         nfserr = nfserr_toosmall;
2995                         goto fail;
2996                 }
2997         }
2998         nfserr = nfserr_toosmall;
2999         entry_bytes = xdr->buf->len - start_offset;
3000         if (entry_bytes > cd->rd_maxcount)
3001                 goto fail;
3002         cd->rd_maxcount -= entry_bytes;
3003         /*
3004          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3005          * let's always let through the first entry, at least:
3006          */
3007         if (!cd->rd_dircount)
3008                 goto fail;
3009         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3010         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3011                 goto fail;
3012         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3013
3014         cd->cookie_offset = cookie_offset;
3015 skip_entry:
3016         cd->common.err = nfs_ok;
3017         return 0;
3018 fail:
3019         xdr_truncate_encode(xdr, start_offset);
3020         cd->common.err = nfserr;
3021         return -EINVAL;
3022 }
3023
3024 static __be32
3025 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3026 {
3027         __be32 *p;
3028
3029         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3030         if (!p)
3031                 return nfserr_resource;
3032         *p++ = cpu_to_be32(sid->si_generation);
3033         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3034                                         sizeof(stateid_opaque_t));
3035         return 0;
3036 }
3037
3038 static __be32
3039 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3040 {
3041         struct xdr_stream *xdr = &resp->xdr;
3042         __be32 *p;
3043
3044         if (!nfserr) {
3045                 p = xdr_reserve_space(xdr, 8);
3046                 if (!p)
3047                         return nfserr_resource;
3048                 *p++ = cpu_to_be32(access->ac_supported);
3049                 *p++ = cpu_to_be32(access->ac_resp_access);
3050         }
3051         return nfserr;
3052 }
3053
3054 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3055 {
3056         struct xdr_stream *xdr = &resp->xdr;
3057         __be32 *p;
3058
3059         if (!nfserr) {
3060                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3061                 if (!p)
3062                         return nfserr_resource;
3063                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3064                                                 NFS4_MAX_SESSIONID_LEN);
3065                 *p++ = cpu_to_be32(bcts->dir);
3066                 /* Upshifting from TCP to RDMA is not supported */
3067                 *p++ = cpu_to_be32(0);
3068         }
3069         return nfserr;
3070 }
3071
3072 static __be32
3073 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3074 {
3075         struct xdr_stream *xdr = &resp->xdr;
3076
3077         if (!nfserr)
3078                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3079
3080         return nfserr;
3081 }
3082
3083
3084 static __be32
3085 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3086 {
3087         struct xdr_stream *xdr = &resp->xdr;
3088         __be32 *p;
3089
3090         if (!nfserr) {
3091                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3092                 if (!p)
3093                         return nfserr_resource;
3094                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3095                                                 NFS4_VERIFIER_SIZE);
3096         }
3097         return nfserr;
3098 }
3099
3100 static __be32
3101 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3102 {
3103         struct xdr_stream *xdr = &resp->xdr;
3104         __be32 *p;
3105
3106         if (!nfserr) {
3107                 p = xdr_reserve_space(xdr, 20);
3108                 if (!p)
3109                         return nfserr_resource;
3110                 encode_cinfo(p, &create->cr_cinfo);
3111                 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3112                                 create->cr_bmval[1], create->cr_bmval[2]);
3113         }
3114         return nfserr;
3115 }
3116
3117 static __be32
3118 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3119 {
3120         struct svc_fh *fhp = getattr->ga_fhp;
3121         struct xdr_stream *xdr = &resp->xdr;
3122
3123         if (nfserr)
3124                 return nfserr;
3125
3126         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3127                                     getattr->ga_bmval,
3128                                     resp->rqstp, 0);
3129         return nfserr;
3130 }
3131
3132 static __be32
3133 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3134 {
3135         struct xdr_stream *xdr = &resp->xdr;
3136         struct svc_fh *fhp = *fhpp;
3137         unsigned int len;
3138         __be32 *p;
3139
3140         if (!nfserr) {
3141                 len = fhp->fh_handle.fh_size;
3142                 p = xdr_reserve_space(xdr, len + 4);
3143                 if (!p)
3144                         return nfserr_resource;
3145                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3146         }
3147         return nfserr;
3148 }
3149
3150 /*
3151 * Including all fields other than the name, a LOCK4denied structure requires
3152 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3153 */
3154 static __be32
3155 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3156 {
3157         struct xdr_netobj *conf = &ld->ld_owner;
3158         __be32 *p;
3159
3160 again:
3161         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3162         if (!p) {
3163                 /*
3164                  * Don't fail to return the result just because we can't
3165                  * return the conflicting open:
3166                  */
3167                 if (conf->len) {
3168                         kfree(conf->data);
3169                         conf->len = 0;
3170                         conf->data = NULL;
3171                         goto again;
3172                 }
3173                 return nfserr_resource;
3174         }
3175         p = xdr_encode_hyper(p, ld->ld_start);
3176         p = xdr_encode_hyper(p, ld->ld_length);
3177         *p++ = cpu_to_be32(ld->ld_type);
3178         if (conf->len) {
3179                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3180                 p = xdr_encode_opaque(p, conf->data, conf->len);
3181                 kfree(conf->data);
3182         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3183                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3184                 *p++ = cpu_to_be32(0); /* length of owner name */
3185         }
3186         return nfserr_denied;
3187 }
3188
3189 static __be32
3190 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3191 {
3192         struct xdr_stream *xdr = &resp->xdr;
3193
3194         if (!nfserr)
3195                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3196         else if (nfserr == nfserr_denied)
3197                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3198
3199         return nfserr;
3200 }
3201
3202 static __be32
3203 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3204 {
3205         struct xdr_stream *xdr = &resp->xdr;
3206
3207         if (nfserr == nfserr_denied)
3208                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3209         return nfserr;
3210 }
3211
3212 static __be32
3213 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3214 {
3215         struct xdr_stream *xdr = &resp->xdr;
3216
3217         if (!nfserr)
3218                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3219
3220         return nfserr;
3221 }
3222
3223
3224 static __be32
3225 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3226 {
3227         struct xdr_stream *xdr = &resp->xdr;
3228         __be32 *p;
3229
3230         if (!nfserr) {
3231                 p = xdr_reserve_space(xdr, 20);
3232                 if (!p)
3233                         return nfserr_resource;
3234                 p = encode_cinfo(p, &link->li_cinfo);
3235         }
3236         return nfserr;
3237 }
3238
3239
3240 static __be32
3241 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3242 {
3243         struct xdr_stream *xdr = &resp->xdr;
3244         __be32 *p;
3245
3246         if (nfserr)
3247                 goto out;
3248
3249         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3250         if (nfserr)
3251                 goto out;
3252         p = xdr_reserve_space(xdr, 24);
3253         if (!p)
3254                 return nfserr_resource;
3255         p = encode_cinfo(p, &open->op_cinfo);
3256         *p++ = cpu_to_be32(open->op_rflags);
3257
3258         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3259                                         open->op_bmval[2]);
3260         if (nfserr)
3261                 goto out;
3262
3263         p = xdr_reserve_space(xdr, 4);
3264         if (!p)
3265                 return nfserr_resource;
3266
3267         *p++ = cpu_to_be32(open->op_delegate_type);
3268         switch (open->op_delegate_type) {
3269         case NFS4_OPEN_DELEGATE_NONE:
3270                 break;
3271         case NFS4_OPEN_DELEGATE_READ:
3272                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3273                 if (nfserr)
3274                         return nfserr;
3275                 p = xdr_reserve_space(xdr, 20);
3276                 if (!p)
3277                         return nfserr_resource;
3278                 *p++ = cpu_to_be32(open->op_recall);
3279
3280                 /*
3281                  * TODO: ACE's in delegations
3282                  */
3283                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3284                 *p++ = cpu_to_be32(0);
3285                 *p++ = cpu_to_be32(0);
3286                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3287                 break;
3288         case NFS4_OPEN_DELEGATE_WRITE:
3289                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3290                 if (nfserr)
3291                         return nfserr;
3292                 p = xdr_reserve_space(xdr, 32);
3293                 if (!p)
3294                         return nfserr_resource;
3295                 *p++ = cpu_to_be32(0);
3296
3297                 /*
3298                  * TODO: space_limit's in delegations
3299                  */
3300                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3301                 *p++ = cpu_to_be32(~(u32)0);
3302                 *p++ = cpu_to_be32(~(u32)0);
3303
3304                 /*
3305                  * TODO: ACE's in delegations
3306                  */
3307                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3308                 *p++ = cpu_to_be32(0);
3309                 *p++ = cpu_to_be32(0);
3310                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3311                 break;
3312         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3313                 switch (open->op_why_no_deleg) {
3314                 case WND4_CONTENTION:
3315                 case WND4_RESOURCE:
3316                         p = xdr_reserve_space(xdr, 8);
3317                         if (!p)
3318                                 return nfserr_resource;
3319                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3320                         /* deleg signaling not supported yet: */
3321                         *p++ = cpu_to_be32(0);
3322                         break;
3323                 default:
3324                         p = xdr_reserve_space(xdr, 4);
3325                         if (!p)
3326                                 return nfserr_resource;
3327                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3328                 }
3329                 break;
3330         default:
3331                 BUG();
3332         }
3333         /* XXX save filehandle here */
3334 out:
3335         return nfserr;
3336 }
3337
3338 static __be32
3339 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3340 {
3341         struct xdr_stream *xdr = &resp->xdr;
3342
3343         if (!nfserr)
3344                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3345
3346         return nfserr;
3347 }
3348
3349 static __be32
3350 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3351 {
3352         struct xdr_stream *xdr = &resp->xdr;
3353
3354         if (!nfserr)
3355                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3356
3357         return nfserr;
3358 }
3359
3360 static __be32 nfsd4_encode_splice_read(
3361                                 struct nfsd4_compoundres *resp,
3362                                 struct nfsd4_read *read,
3363                                 struct file *file, unsigned long maxcount)
3364 {
3365         struct xdr_stream *xdr = &resp->xdr;
3366         struct xdr_buf *buf = xdr->buf;
3367         u32 eof;
3368         int space_left;
3369         __be32 nfserr;
3370         __be32 *p = xdr->p - 2;
3371
3372         /* Make sure there will be room for padding if needed */
3373         if (xdr->end - xdr->p < 1)
3374                 return nfserr_resource;
3375
3376         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3377                                   read->rd_offset, &maxcount);
3378         if (nfserr) {
3379                 /*
3380                  * nfsd_splice_actor may have already messed with the
3381                  * page length; reset it so as not to confuse
3382                  * xdr_truncate_encode:
3383                  */
3384                 buf->page_len = 0;
3385                 return nfserr;
3386         }
3387
3388         eof = (read->rd_offset + maxcount >=
3389                d_inode(read->rd_fhp->fh_dentry)->i_size);
3390
3391         *(p++) = htonl(eof);
3392         *(p++) = htonl(maxcount);
3393
3394         buf->page_len = maxcount;
3395         buf->len += maxcount;
3396         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3397                                                         / PAGE_SIZE;
3398
3399         /* Use rest of head for padding and remaining ops: */
3400         buf->tail[0].iov_base = xdr->p;
3401         buf->tail[0].iov_len = 0;
3402         xdr->iov = buf->tail;
3403         if (maxcount&3) {
3404                 int pad = 4 - (maxcount&3);
3405
3406                 *(xdr->p++) = 0;
3407
3408                 buf->tail[0].iov_base += maxcount&3;
3409                 buf->tail[0].iov_len = pad;
3410                 buf->len += pad;
3411         }
3412
3413         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3414                                 buf->buflen - buf->len);
3415         buf->buflen = buf->len + space_left;
3416         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3417
3418         return 0;
3419 }
3420
3421 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3422                                  struct nfsd4_read *read,
3423                                  struct file *file, unsigned long maxcount)
3424 {
3425         struct xdr_stream *xdr = &resp->xdr;
3426         u32 eof;
3427         int v;
3428         int starting_len = xdr->buf->len - 8;
3429         long len;
3430         int thislen;
3431         __be32 nfserr;
3432         __be32 tmp;
3433         __be32 *p;
3434         u32 zzz = 0;
3435         int pad;
3436
3437         len = maxcount;
3438         v = 0;
3439
3440         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3441         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3442         WARN_ON_ONCE(!p);
3443         resp->rqstp->rq_vec[v].iov_base = p;
3444         resp->rqstp->rq_vec[v].iov_len = thislen;
3445         v++;
3446         len -= thislen;
3447
3448         while (len) {
3449                 thislen = min_t(long, len, PAGE_SIZE);
3450                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3451                 WARN_ON_ONCE(!p);
3452                 resp->rqstp->rq_vec[v].iov_base = p;
3453                 resp->rqstp->rq_vec[v].iov_len = thislen;
3454                 v++;
3455                 len -= thislen;
3456         }
3457         read->rd_vlen = v;
3458
3459         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3460                         read->rd_vlen, &maxcount);
3461         if (nfserr)
3462                 return nfserr;
3463         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3464
3465         eof = (read->rd_offset + maxcount >=
3466                d_inode(read->rd_fhp->fh_dentry)->i_size);
3467
3468         tmp = htonl(eof);
3469         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3470         tmp = htonl(maxcount);
3471         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3472
3473         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3474         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3475                                                                 &zzz, pad);
3476         return 0;
3477
3478 }
3479
3480 static __be32
3481 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3482                   struct nfsd4_read *read)
3483 {
3484         unsigned long maxcount;
3485         struct xdr_stream *xdr = &resp->xdr;
3486         struct file *file = read->rd_filp;
3487         int starting_len = xdr->buf->len;
3488         struct raparms *ra = NULL;
3489         __be32 *p;
3490
3491         if (nfserr)
3492                 goto out;
3493
3494         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3495         if (!p) {
3496                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3497                 nfserr = nfserr_resource;
3498                 goto out;
3499         }
3500         if (resp->xdr.buf->page_len &&
3501             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3502                 WARN_ON_ONCE(1);
3503                 nfserr = nfserr_resource;
3504                 goto out;
3505         }
3506         xdr_commit_encode(xdr);
3507
3508         maxcount = svc_max_payload(resp->rqstp);
3509         maxcount = min_t(unsigned long, maxcount,
3510                          (xdr->buf->buflen - xdr->buf->len));
3511         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3512
3513         if (read->rd_tmp_file)
3514                 ra = nfsd_init_raparms(file);
3515
3516         if (file->f_op->splice_read &&
3517             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3518                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3519         else
3520                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3521
3522         if (ra)
3523                 nfsd_put_raparams(file, ra);
3524
3525         if (nfserr)
3526                 xdr_truncate_encode(xdr, starting_len);
3527
3528 out:
3529         if (file)
3530                 fput(file);
3531         return nfserr;
3532 }
3533
3534 static __be32
3535 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3536 {
3537         int maxcount;
3538         __be32 wire_count;
3539         int zero = 0;
3540         struct xdr_stream *xdr = &resp->xdr;
3541         int length_offset = xdr->buf->len;
3542         __be32 *p;
3543
3544         if (nfserr)
3545                 return nfserr;
3546
3547         p = xdr_reserve_space(xdr, 4);
3548         if (!p)
3549                 return nfserr_resource;
3550         maxcount = PAGE_SIZE;
3551
3552         p = xdr_reserve_space(xdr, maxcount);
3553         if (!p)
3554                 return nfserr_resource;
3555         /*
3556          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3557          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3558          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3559          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3560          */
3561         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3562                                                 (char *)p, &maxcount);
3563         if (nfserr == nfserr_isdir)
3564                 nfserr = nfserr_inval;
3565         if (nfserr) {
3566                 xdr_truncate_encode(xdr, length_offset);
3567                 return nfserr;
3568         }
3569
3570         wire_count = htonl(maxcount);
3571         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3572         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3573         if (maxcount & 3)
3574                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3575                                                 &zero, 4 - (maxcount&3));
3576         return 0;
3577 }
3578
3579 static __be32
3580 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3581 {
3582         int maxcount;
3583         int bytes_left;
3584         loff_t offset;
3585         __be64 wire_offset;
3586         struct xdr_stream *xdr = &resp->xdr;
3587         int starting_len = xdr->buf->len;
3588         __be32 *p;
3589
3590         if (nfserr)
3591                 return nfserr;
3592
3593         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3594         if (!p)
3595                 return nfserr_resource;
3596
3597         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3598         *p++ = cpu_to_be32(0);
3599         *p++ = cpu_to_be32(0);
3600         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3601                                 - (char *)resp->xdr.buf->head[0].iov_base;
3602
3603         /*
3604          * Number of bytes left for directory entries allowing for the
3605          * final 8 bytes of the readdir and a following failed op:
3606          */
3607         bytes_left = xdr->buf->buflen - xdr->buf->len
3608                         - COMPOUND_ERR_SLACK_SPACE - 8;
3609         if (bytes_left < 0) {
3610                 nfserr = nfserr_resource;
3611                 goto err_no_verf;
3612         }
3613         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3614         /*
3615          * Note the rfc defines rd_maxcount as the size of the
3616          * READDIR4resok structure, which includes the verifier above
3617          * and the 8 bytes encoded at the end of this function:
3618          */
3619         if (maxcount < 16) {
3620                 nfserr = nfserr_toosmall;
3621                 goto err_no_verf;
3622         }
3623         maxcount = min_t(int, maxcount-16, bytes_left);
3624
3625         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3626         if (!readdir->rd_dircount)
3627                 readdir->rd_dircount = INT_MAX;
3628
3629         readdir->xdr = xdr;
3630         readdir->rd_maxcount = maxcount;
3631         readdir->common.err = 0;
3632         readdir->cookie_offset = 0;
3633
3634         offset = readdir->rd_cookie;
3635         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3636                               &offset,
3637                               &readdir->common, nfsd4_encode_dirent);
3638         if (nfserr == nfs_ok &&
3639             readdir->common.err == nfserr_toosmall &&
3640             xdr->buf->len == starting_len + 8) {
3641                 /* nothing encoded; which limit did we hit?: */
3642                 if (maxcount - 16 < bytes_left)
3643                         /* It was the fault of rd_maxcount: */
3644                         nfserr = nfserr_toosmall;
3645                 else
3646                         /* We ran out of buffer space: */
3647                         nfserr = nfserr_resource;
3648         }
3649         if (nfserr)
3650                 goto err_no_verf;
3651
3652         if (readdir->cookie_offset) {
3653                 wire_offset = cpu_to_be64(offset);
3654                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3655                                                         &wire_offset, 8);
3656         }
3657
3658         p = xdr_reserve_space(xdr, 8);
3659         if (!p) {
3660                 WARN_ON_ONCE(1);
3661                 goto err_no_verf;
3662         }
3663         *p++ = 0;       /* no more entries */
3664         *p++ = htonl(readdir->common.err == nfserr_eof);
3665
3666         return 0;
3667 err_no_verf:
3668         xdr_truncate_encode(xdr, starting_len);
3669         return nfserr;
3670 }
3671
3672 static __be32
3673 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3674 {
3675         struct xdr_stream *xdr = &resp->xdr;
3676         __be32 *p;
3677
3678         if (!nfserr) {
3679                 p = xdr_reserve_space(xdr, 20);
3680                 if (!p)
3681                         return nfserr_resource;
3682                 p = encode_cinfo(p, &remove->rm_cinfo);
3683         }
3684         return nfserr;
3685 }
3686
3687 static __be32
3688 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3689 {
3690         struct xdr_stream *xdr = &resp->xdr;
3691         __be32 *p;
3692
3693         if (!nfserr) {
3694                 p = xdr_reserve_space(xdr, 40);
3695                 if (!p)
3696                         return nfserr_resource;
3697                 p = encode_cinfo(p, &rename->rn_sinfo);
3698                 p = encode_cinfo(p, &rename->rn_tinfo);
3699         }
3700         return nfserr;
3701 }
3702
3703 static __be32
3704 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3705                          __be32 nfserr, struct svc_export *exp)
3706 {
3707         u32 i, nflavs, supported;
3708         struct exp_flavor_info *flavs;
3709         struct exp_flavor_info def_flavs[2];
3710         __be32 *p, *flavorsp;
3711         static bool report = true;
3712
3713         if (nfserr)
3714                 goto out;
3715         nfserr = nfserr_resource;
3716         if (exp->ex_nflavors) {
3717                 flavs = exp->ex_flavors;
3718                 nflavs = exp->ex_nflavors;
3719         } else { /* Handling of some defaults in absence of real secinfo: */
3720                 flavs = def_flavs;
3721                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3722                         nflavs = 2;
3723                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3724                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3725                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3726                         nflavs = 1;
3727                         flavs[0].pseudoflavor
3728                                         = svcauth_gss_flavor(exp->ex_client);
3729                 } else {
3730                         nflavs = 1;
3731                         flavs[0].pseudoflavor
3732                                         = exp->ex_client->flavour->flavour;
3733                 }
3734         }
3735
3736         supported = 0;
3737         p = xdr_reserve_space(xdr, 4);
3738         if (!p)
3739                 goto out;
3740         flavorsp = p++;         /* to be backfilled later */
3741
3742         for (i = 0; i < nflavs; i++) {
3743                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3744                 struct rpcsec_gss_info info;
3745
3746                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3747                         supported++;
3748                         p = xdr_reserve_space(xdr, 4 + 4 +
3749                                               XDR_LEN(info.oid.len) + 4 + 4);
3750                         if (!p)
3751                                 goto out;
3752                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3753                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3754                         *p++ = cpu_to_be32(info.qop);
3755                         *p++ = cpu_to_be32(info.service);
3756                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3757                         supported++;
3758                         p = xdr_reserve_space(xdr, 4);
3759                         if (!p)
3760                                 goto out;
3761                         *p++ = cpu_to_be32(pf);
3762                 } else {
3763                         if (report)
3764                                 pr_warn("NFS: SECINFO: security flavor %u "
3765                                         "is not supported\n", pf);
3766                 }
3767         }
3768
3769         if (nflavs != supported)
3770                 report = false;
3771         *flavorsp = htonl(supported);
3772         nfserr = 0;
3773 out:
3774         if (exp)
3775                 exp_put(exp);
3776         return nfserr;
3777 }
3778
3779 static __be32
3780 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3781                      struct nfsd4_secinfo *secinfo)
3782 {
3783         struct xdr_stream *xdr = &resp->xdr;
3784
3785         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3786 }
3787
3788 static __be32
3789 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3790                      struct nfsd4_secinfo_no_name *secinfo)
3791 {
3792         struct xdr_stream *xdr = &resp->xdr;
3793
3794         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3795 }
3796
3797 /*
3798  * The SETATTR encode routine is special -- it always encodes a bitmap,
3799  * regardless of the error status.
3800  */
3801 static __be32
3802 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3803 {
3804         struct xdr_stream *xdr = &resp->xdr;
3805         __be32 *p;
3806
3807         p = xdr_reserve_space(xdr, 16);
3808         if (!p)
3809                 return nfserr_resource;
3810         if (nfserr) {
3811                 *p++ = cpu_to_be32(3);
3812                 *p++ = cpu_to_be32(0);
3813                 *p++ = cpu_to_be32(0);
3814                 *p++ = cpu_to_be32(0);
3815         }
3816         else {
3817                 *p++ = cpu_to_be32(3);
3818                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3819                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3820                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3821         }
3822         return nfserr;
3823 }
3824
3825 static __be32
3826 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3827 {
3828         struct xdr_stream *xdr = &resp->xdr;
3829         __be32 *p;
3830
3831         if (!nfserr) {
3832                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3833                 if (!p)
3834                         return nfserr_resource;
3835                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3836                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3837                                                 NFS4_VERIFIER_SIZE);
3838         }
3839         else if (nfserr == nfserr_clid_inuse) {
3840                 p = xdr_reserve_space(xdr, 8);
3841                 if (!p)
3842                         return nfserr_resource;
3843                 *p++ = cpu_to_be32(0);
3844                 *p++ = cpu_to_be32(0);
3845         }
3846         return nfserr;
3847 }
3848
3849 static __be32
3850 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3851 {
3852         struct xdr_stream *xdr = &resp->xdr;
3853         __be32 *p;
3854
3855         if (!nfserr) {
3856                 p = xdr_reserve_space(xdr, 16);
3857                 if (!p)
3858                         return nfserr_resource;
3859                 *p++ = cpu_to_be32(write->wr_bytes_written);
3860                 *p++ = cpu_to_be32(write->wr_how_written);
3861                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3862                                                         NFS4_VERIFIER_SIZE);
3863         }
3864         return nfserr;
3865 }
3866
3867 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3868         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3869               1 << (OP_EXCHANGE_ID - 32) |
3870               1 << (OP_CREATE_SESSION - 32) |
3871               1 << (OP_DESTROY_SESSION - 32) |
3872               1 << (OP_DESTROY_CLIENTID - 32)
3873 };
3874
3875 static __be32
3876 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3877                          struct nfsd4_exchange_id *exid)
3878 {
3879         struct xdr_stream *xdr = &resp->xdr;
3880         __be32 *p;
3881         char *major_id;
3882         char *server_scope;
3883         int major_id_sz;
3884         int server_scope_sz;
3885         uint64_t minor_id = 0;
3886
3887         if (nfserr)
3888                 return nfserr;
3889
3890         major_id = utsname()->nodename;
3891         major_id_sz = strlen(major_id);
3892         server_scope = utsname()->nodename;
3893         server_scope_sz = strlen(server_scope);
3894
3895         p = xdr_reserve_space(xdr,
3896                 8 /* eir_clientid */ +
3897                 4 /* eir_sequenceid */ +
3898                 4 /* eir_flags */ +
3899                 4 /* spr_how */);
3900         if (!p)
3901                 return nfserr_resource;
3902
3903         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3904         *p++ = cpu_to_be32(exid->seqid);
3905         *p++ = cpu_to_be32(exid->flags);
3906
3907         *p++ = cpu_to_be32(exid->spa_how);
3908
3909         switch (exid->spa_how) {
3910         case SP4_NONE:
3911                 break;
3912         case SP4_MACH_CRED:
3913                 /* spo_must_enforce, spo_must_allow */
3914                 p = xdr_reserve_space(xdr, 16);
3915                 if (!p)
3916                         return nfserr_resource;
3917
3918                 /* spo_must_enforce bitmap: */
3919                 *p++ = cpu_to_be32(2);
3920                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3921                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3922                 /* empty spo_must_allow bitmap: */
3923                 *p++ = cpu_to_be32(0);
3924
3925                 break;
3926         default:
3927                 WARN_ON_ONCE(1);
3928         }
3929
3930         p = xdr_reserve_space(xdr,
3931                 8 /* so_minor_id */ +
3932                 4 /* so_major_id.len */ +
3933                 (XDR_QUADLEN(major_id_sz) * 4) +
3934                 4 /* eir_server_scope.len */ +
3935                 (XDR_QUADLEN(server_scope_sz) * 4) +
3936                 4 /* eir_server_impl_id.count (0) */);
3937         if (!p)
3938                 return nfserr_resource;
3939
3940         /* The server_owner struct */
3941         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3942         /* major id */
3943         p = xdr_encode_opaque(p, major_id, major_id_sz);
3944
3945         /* Server scope */
3946         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3947
3948         /* Implementation id */
3949         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3950         return 0;
3951 }
3952
3953 static __be32
3954 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3955                             struct nfsd4_create_session *sess)
3956 {
3957         struct xdr_stream *xdr = &resp->xdr;
3958         __be32 *p;
3959
3960         if (nfserr)
3961                 return nfserr;
3962
3963         p = xdr_reserve_space(xdr, 24);
3964         if (!p)
3965                 return nfserr_resource;
3966         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3967                                         NFS4_MAX_SESSIONID_LEN);
3968         *p++ = cpu_to_be32(sess->seqid);
3969         *p++ = cpu_to_be32(sess->flags);
3970
3971         p = xdr_reserve_space(xdr, 28);
3972         if (!p)
3973                 return nfserr_resource;
3974         *p++ = cpu_to_be32(0); /* headerpadsz */
3975         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3976         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3977         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3978         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3979         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3980         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3981
3982         if (sess->fore_channel.nr_rdma_attrs) {
3983                 p = xdr_reserve_space(xdr, 4);
3984                 if (!p)
3985                         return nfserr_resource;
3986                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3987         }
3988
3989         p = xdr_reserve_space(xdr, 28);
3990         if (!p)
3991                 return nfserr_resource;
3992         *p++ = cpu_to_be32(0); /* headerpadsz */
3993         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3994         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3995         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3996         *p++ = cpu_to_be32(sess->back_channel.maxops);
3997         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3998         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3999
4000         if (sess->back_channel.nr_rdma_attrs) {
4001                 p = xdr_reserve_space(xdr, 4);
4002                 if (!p)
4003                         return nfserr_resource;
4004                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4005         }
4006         return 0;
4007 }
4008
4009 static __be32
4010 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4011                       struct nfsd4_sequence *seq)
4012 {
4013         struct xdr_stream *xdr = &resp->xdr;
4014         __be32 *p;
4015
4016         if (nfserr)
4017                 return nfserr;
4018
4019         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4020         if (!p)
4021                 return nfserr_resource;
4022         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4023                                         NFS4_MAX_SESSIONID_LEN);
4024         *p++ = cpu_to_be32(seq->seqid);
4025         *p++ = cpu_to_be32(seq->slotid);
4026         /* Note slotid's are numbered from zero: */
4027         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4028         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4029         *p++ = cpu_to_be32(seq->status_flags);
4030
4031         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4032         return 0;
4033 }
4034
4035 static __be32
4036 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4037                           struct nfsd4_test_stateid *test_stateid)
4038 {
4039         struct xdr_stream *xdr = &resp->xdr;
4040         struct nfsd4_test_stateid_id *stateid, *next;
4041         __be32 *p;
4042
4043         if (nfserr)
4044                 return nfserr;
4045
4046         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4047         if (!p)
4048                 return nfserr_resource;
4049         *p++ = htonl(test_stateid->ts_num_ids);
4050
4051         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4052                 *p++ = stateid->ts_id_status;
4053         }
4054
4055         return nfserr;
4056 }
4057
4058 #ifdef CONFIG_NFSD_PNFS
4059 static __be32
4060 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4061                 struct nfsd4_getdeviceinfo *gdev)
4062 {
4063         struct xdr_stream *xdr = &resp->xdr;
4064         const struct nfsd4_layout_ops *ops =
4065                 nfsd4_layout_ops[gdev->gd_layout_type];
4066         u32 starting_len = xdr->buf->len, needed_len;
4067         __be32 *p;
4068
4069         dprintk("%s: err %d\n", __func__, nfserr);
4070         if (nfserr)
4071                 goto out;
4072
4073         nfserr = nfserr_resource;
4074         p = xdr_reserve_space(xdr, 4);
4075         if (!p)
4076                 goto out;
4077
4078         *p++ = cpu_to_be32(gdev->gd_layout_type);
4079
4080         /* If maxcount is 0 then just update notifications */
4081         if (gdev->gd_maxcount != 0) {
4082                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4083                 if (nfserr) {
4084                         /*
4085                          * We don't bother to burden the layout drivers with
4086                          * enforcing gd_maxcount, just tell the client to
4087                          * come back with a bigger buffer if it's not enough.
4088                          */
4089                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4090                                 goto toosmall;
4091                         goto out;
4092                 }
4093         }
4094
4095         nfserr = nfserr_resource;
4096         if (gdev->gd_notify_types) {
4097                 p = xdr_reserve_space(xdr, 4 + 4);
4098                 if (!p)
4099                         goto out;
4100                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4101                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4102         } else {
4103                 p = xdr_reserve_space(xdr, 4);
4104                 if (!p)
4105                         goto out;
4106                 *p++ = 0;
4107         }
4108
4109         nfserr = 0;
4110 out:
4111         kfree(gdev->gd_device);
4112         dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4113         return nfserr;
4114
4115 toosmall:
4116         dprintk("%s: maxcount too small\n", __func__);
4117         needed_len = xdr->buf->len + 4 /* notifications */;
4118         xdr_truncate_encode(xdr, starting_len);
4119         p = xdr_reserve_space(xdr, 4);
4120         if (!p) {
4121                 nfserr = nfserr_resource;
4122         } else {
4123                 *p++ = cpu_to_be32(needed_len);
4124                 nfserr = nfserr_toosmall;
4125         }
4126         goto out;
4127 }
4128
4129 static __be32
4130 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4131                 struct nfsd4_layoutget *lgp)
4132 {
4133         struct xdr_stream *xdr = &resp->xdr;
4134         const struct nfsd4_layout_ops *ops =
4135                 nfsd4_layout_ops[lgp->lg_layout_type];
4136         __be32 *p;
4137
4138         dprintk("%s: err %d\n", __func__, nfserr);
4139         if (nfserr)
4140                 goto out;
4141
4142         nfserr = nfserr_resource;
4143         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4144         if (!p)
4145                 goto out;
4146
4147         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4148         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4149         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4150                                     sizeof(stateid_opaque_t));
4151
4152         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4153         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4154         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4155         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4156         *p++ = cpu_to_be32(lgp->lg_layout_type);
4157
4158         nfserr = ops->encode_layoutget(xdr, lgp);
4159 out:
4160         kfree(lgp->lg_content);
4161         return nfserr;
4162 }
4163
4164 static __be32
4165 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4166                           struct nfsd4_layoutcommit *lcp)
4167 {
4168         struct xdr_stream *xdr = &resp->xdr;
4169         __be32 *p;
4170
4171         if (nfserr)
4172                 return nfserr;
4173
4174         p = xdr_reserve_space(xdr, 4);
4175         if (!p)
4176                 return nfserr_resource;
4177         *p++ = cpu_to_be32(lcp->lc_size_chg);
4178         if (lcp->lc_size_chg) {
4179                 p = xdr_reserve_space(xdr, 8);
4180                 if (!p)
4181                         return nfserr_resource;
4182                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4183         }
4184
4185         return nfs_ok;
4186 }
4187
4188 static __be32
4189 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4190                 struct nfsd4_layoutreturn *lrp)
4191 {
4192         struct xdr_stream *xdr = &resp->xdr;
4193         __be32 *p;
4194
4195         if (nfserr)
4196                 return nfserr;
4197
4198         p = xdr_reserve_space(xdr, 4);
4199         if (!p)
4200                 return nfserr_resource;
4201         *p++ = cpu_to_be32(lrp->lrs_present);
4202         if (lrp->lrs_present)
4203                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4204         return nfs_ok;
4205 }
4206 #endif /* CONFIG_NFSD_PNFS */
4207
4208 static __be32
4209 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4210                   struct nfsd4_seek *seek)
4211 {
4212         __be32 *p;
4213
4214         if (nfserr)
4215                 return nfserr;
4216
4217         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4218         *p++ = cpu_to_be32(seek->seek_eof);
4219         p = xdr_encode_hyper(p, seek->seek_pos);
4220
4221         return nfserr;
4222 }
4223
4224 static __be32
4225 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4226 {
4227         return nfserr;
4228 }
4229
4230 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4231
4232 /*
4233  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4234  * since we don't need to filter out obsolete ops as this is
4235  * done in the decoding phase.
4236  */
4237 static nfsd4_enc nfsd4_enc_ops[] = {
4238         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4239         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4240         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4241         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4242         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4243         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4244         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4245         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4246         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4247         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4248         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4249         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4250         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4251         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4252         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4253         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4254         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4255         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4256         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4257         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4258         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4259         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4260         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4261         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4262         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4263         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4264         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4265         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4266         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4267         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4268         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4269         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4270         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4271         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4272         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4273         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4274         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4275
4276         /* NFSv4.1 operations */
4277         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4278         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4279         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4280         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4281         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4282         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4283         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4284 #ifdef CONFIG_NFSD_PNFS
4285         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4286         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4287         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4288         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4289         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4290 #else
4291         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4292         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4293         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4294         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4295         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4296 #endif
4297         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4298         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4299         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4300         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4301         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4302         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4303         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4304
4305         /* NFSv4.2 operations */
4306         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4307         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_noop,
4308         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4309         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4310         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4311         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4312         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4313         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4314         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4315         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4316         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4317         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4318         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4319 };
4320
4321 /*
4322  * Calculate whether we still have space to encode repsize bytes.
4323  * There are two considerations:
4324  *     - For NFS versions >=4.1, the size of the reply must stay within
4325  *       session limits
4326  *     - For all NFS versions, we must stay within limited preallocated
4327  *       buffer space.
4328  *
4329  * This is called before the operation is processed, so can only provide
4330  * an upper estimate.  For some nonidempotent operations (such as
4331  * getattr), it's not necessarily a problem if that estimate is wrong,
4332  * as we can fail it after processing without significant side effects.
4333  */
4334 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4335 {
4336         struct xdr_buf *buf = &resp->rqstp->rq_res;
4337         struct nfsd4_slot *slot = resp->cstate.slot;
4338
4339         if (buf->len + respsize <= buf->buflen)
4340                 return nfs_ok;
4341         if (!nfsd4_has_session(&resp->cstate))
4342                 return nfserr_resource;
4343         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4344                 WARN_ON_ONCE(1);
4345                 return nfserr_rep_too_big_to_cache;
4346         }
4347         return nfserr_rep_too_big;
4348 }
4349
4350 void
4351 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4352 {
4353         struct xdr_stream *xdr = &resp->xdr;
4354         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4355         struct svc_rqst *rqstp = resp->rqstp;
4356         int post_err_offset;
4357         nfsd4_enc encoder;
4358         __be32 *p;
4359
4360         p = xdr_reserve_space(xdr, 8);
4361         if (!p) {
4362                 WARN_ON_ONCE(1);
4363                 return;
4364         }
4365         *p++ = cpu_to_be32(op->opnum);
4366         post_err_offset = xdr->buf->len;
4367
4368         if (op->opnum == OP_ILLEGAL)
4369                 goto status;
4370         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4371                !nfsd4_enc_ops[op->opnum]);
4372         encoder = nfsd4_enc_ops[op->opnum];
4373         op->status = encoder(resp, op->status, &op->u);
4374         xdr_commit_encode(xdr);
4375
4376         /* nfsd4_check_resp_size guarantees enough room for error status */
4377         if (!op->status) {
4378                 int space_needed = 0;
4379                 if (!nfsd4_last_compound_op(rqstp))
4380                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4381                 op->status = nfsd4_check_resp_size(resp, space_needed);
4382         }
4383         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4384                 struct nfsd4_slot *slot = resp->cstate.slot;
4385
4386                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4387                         op->status = nfserr_rep_too_big_to_cache;
4388                 else
4389                         op->status = nfserr_rep_too_big;
4390         }
4391         if (op->status == nfserr_resource ||
4392             op->status == nfserr_rep_too_big ||
4393             op->status == nfserr_rep_too_big_to_cache) {
4394                 /*
4395                  * The operation may have already been encoded or
4396                  * partially encoded.  No op returns anything additional
4397                  * in the case of one of these three errors, so we can
4398                  * just truncate back to after the status.  But it's a
4399                  * bug if we had to do this on a non-idempotent op:
4400                  */
4401                 warn_on_nonidempotent_op(op);
4402                 xdr_truncate_encode(xdr, post_err_offset);
4403         }
4404         if (so) {
4405                 int len = xdr->buf->len - post_err_offset;
4406
4407                 so->so_replay.rp_status = op->status;
4408                 so->so_replay.rp_buflen = len;
4409                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4410                                                 so->so_replay.rp_buf, len);
4411         }
4412 status:
4413         /* Note that op->status is already in network byte order: */
4414         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4415 }
4416
4417 /*
4418  * Encode the reply stored in the stateowner reply cache
4419  *
4420  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4421  * previously sent already encoded operation.
4422  */
4423 void
4424 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4425 {
4426         __be32 *p;
4427         struct nfs4_replay *rp = op->replay;
4428
4429         BUG_ON(!rp);
4430
4431         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4432         if (!p) {
4433                 WARN_ON_ONCE(1);
4434                 return;
4435         }
4436         *p++ = cpu_to_be32(op->opnum);
4437         *p++ = rp->rp_status;  /* already xdr'ed */
4438
4439         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4440 }
4441
4442 int
4443 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4444 {
4445         return xdr_ressize_check(rqstp, p);
4446 }
4447
4448 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4449 {
4450         struct svc_rqst *rqstp = rq;
4451         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4452
4453         if (args->ops != args->iops) {
4454                 kfree(args->ops);
4455                 args->ops = args->iops;
4456         }
4457         kfree(args->tmpp);
4458         args->tmpp = NULL;
4459         while (args->to_free) {
4460                 struct svcxdr_tmpbuf *tb = args->to_free;
4461                 args->to_free = tb->next;
4462                 kfree(tb);
4463         }
4464         return 1;
4465 }
4466
4467 int
4468 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4469 {
4470         if (rqstp->rq_arg.head[0].iov_len % 4) {
4471                 /* client is nuts */
4472                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4473                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4474                 return 0;
4475         }
4476         args->p = p;
4477         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4478         args->pagelist = rqstp->rq_arg.pages;
4479         args->pagelen = rqstp->rq_arg.page_len;
4480         args->tmpp = NULL;
4481         args->to_free = NULL;
4482         args->ops = args->iops;
4483         args->rqstp = rqstp;
4484
4485         return !nfsd4_decode_compound(args);
4486 }
4487
4488 int
4489 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4490 {
4491         /*
4492          * All that remains is to write the tag and operation count...
4493          */
4494         struct xdr_buf *buf = resp->xdr.buf;
4495
4496         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4497                                  buf->tail[0].iov_len);
4498
4499         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4500
4501         p = resp->tagp;
4502         *p++ = htonl(resp->taglen);
4503         memcpy(p, resp->tag, resp->taglen);
4504         p += XDR_QUADLEN(resp->taglen);
4505         *p++ = htonl(resp->opcnt);
4506
4507         nfsd4_sequence_done(resp);
4508         return 1;
4509 }
4510
4511 /*
4512  * Local variables:
4513  *  c-basic-offset: 8
4514  * End:
4515  */