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