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/fs_struct.h>
  37 #include <linux/file.h>
  38 #include <linux/slab.h>
  39 #include <linux/namei.h>
  40 #include <linux/statfs.h>
  41 #include <linux/utsname.h>
  42 #include <linux/pagemap.h>
  43 #include <linux/sunrpc/svcauth_gss.h>
  44
  45 #include "idmap.h"
  46 #include "acl.h"
  47 #include "xdr4.h"
  48 #include "vfs.h"
  49 #include "state.h"
  50 #include "cache.h"
  51 #include "netns.h"
  52 #include "pnfs.h"
  53
  54 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  55 #include <linux/security.h>
  56 #endif
  57
  58
  59 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  60
  61 const u32 nfsd_suppattrs[3][3] = {
  62         {NFSD4_SUPPORTED_ATTRS_WORD0,
  63          NFSD4_SUPPORTED_ATTRS_WORD1,
  64          NFSD4_SUPPORTED_ATTRS_WORD2},
  65
  66         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  67          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  68          NFSD4_1_SUPPORTED_ATTRS_WORD2},
  69
  70         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  71          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  72          NFSD4_2_SUPPORTED_ATTRS_WORD2},
  73 };
  74
  75 /*
  76  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  77  * directory in order to indicate to the client that a filesystem boundary is present
  78  * We use a fixed fsid for a referral
  79  */
  80 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  81 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  82
  83 static __be32
  84 check_filename(char *str, int len)
  85 {
  86         int i;
  87
  88         if (len == 0)
  89                 return nfserr_inval;
  90         if (isdotent(str, len))
  91                 return nfserr_badname;
  92         for (i = 0; i < len; i++)
  93                 if (str[i] == '/')
  94                         return nfserr_badname;
  95         return 0;
  96 }
  97
  98 #define DECODE_HEAD                             \
  99         __be32 *p;                              \
 100         __be32 status
 101 #define DECODE_TAIL                             \
 102         status = 0;                             \
 103 out:                                            \
 104         return status;                          \
 105 xdr_error:                                      \
 106         dprintk("NFSD: xdr error (%s:%d)\n",    \
 107                         __FILE__, __LINE__);    \
 108         status = nfserr_bad_xdr;                \
 109         goto out
 110
 111 #define READMEM(x,nbytes) do {                  \
 112         x = (char *)p;                          \
 113         p += XDR_QUADLEN(nbytes);               \
 114 } while (0)
 115 #define SAVEMEM(x,nbytes) do {                  \
 116         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 117                 savemem(argp, p, nbytes) :      \
 118                 (char *)p)) {                   \
 119                 dprintk("NFSD: xdr error (%s:%d)\n", \
 120                                 __FILE__, __LINE__); \
 121                 goto xdr_error;                 \
 122                 }                               \
 123         p += XDR_QUADLEN(nbytes);               \
 124 } while (0)
 125 #define COPYMEM(x,nbytes) do {                  \
 126         memcpy((x), p, nbytes);                 \
 127         p += XDR_QUADLEN(nbytes);               \
 128 } while (0)
 129
 130 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 131 #define READ_BUF(nbytes)  do {                  \
 132         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 133                 p = argp->p;                    \
 134                 argp->p += XDR_QUADLEN(nbytes); \
 135         } else if (!(p = read_buf(argp, nbytes))) { \
 136                 dprintk("NFSD: xdr error (%s:%d)\n", \
 137                                 __FILE__, __LINE__); \
 138                 goto xdr_error;                 \
 139         }                                       \
 140 } while (0)
 141
 142 static void next_decode_page(struct nfsd4_compoundargs *argp)
 143 {
 144         argp->p = page_address(argp->pagelist[0]);
 145         argp->pagelist++;
 146         if (argp->pagelen < PAGE_SIZE) {
 147                 argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
 148                 argp->pagelen = 0;
 149         } else {
 150                 argp->end = argp->p + (PAGE_SIZE>>2);
 151                 argp->pagelen -= PAGE_SIZE;
 152         }
 153 }
 154
 155 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 156 {
 157         /* We want more bytes than seem to be available.
 158          * Maybe we need a new page, maybe we have just run out
 159          */
 160         unsigned int avail = (char *)argp->end - (char *)argp->p;
 161         __be32 *p;
 162
 163         if (argp->pagelen == 0) {
 164                 struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
 165
 166                 if (!argp->tail) {
 167                         argp->tail = true;
 168                         avail = vec->iov_len;
 169                         argp->p = vec->iov_base;
 170                         argp->end = vec->iov_base + avail;
 171                 }
 172
 173                 if (avail < nbytes)
 174                         return NULL;
 175
 176                 p = argp->p;
 177                 argp->p += XDR_QUADLEN(nbytes);
 178                 return p;
 179         }
 180
 181         if (avail + argp->pagelen < nbytes)
 182                 return NULL;
 183         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 184                 return NULL;
 185         /* ok, we can do it with the current plus the next page */
 186         if (nbytes <= sizeof(argp->tmp))
 187                 p = argp->tmp;
 188         else {
 189                 kfree(argp->tmpp);
 190                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 191                 if (!p)
 192                         return NULL;
 193
 194         }
 195         /*
 196          * The following memcpy is safe because read_buf is always
 197          * called with nbytes > avail, and the two cases above both
 198          * guarantee p points to at least nbytes bytes.
 199          */
 200         memcpy(p, argp->p, avail);
 201         next_decode_page(argp);
 202         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 203         argp->p += XDR_QUADLEN(nbytes - avail);
 204         return p;
 205 }
 206
 207 static int zero_clientid(clientid_t *clid)
 208 {
 209         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 210 }
 211
 212 /**
 213  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 214  * @argp: NFSv4 compound argument structure
 215  * @p: pointer to be freed (with kfree())
 216  *
 217  * Marks @p to be freed when processing the compound operation
 218  * described in @argp finishes.
 219  */
 220 static void *
 221 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 222 {
 223         struct svcxdr_tmpbuf *tb;
 224
 225         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 226         if (!tb)
 227                 return NULL;
 228         tb->next = argp->to_free;
 229         argp->to_free = tb;
 230         return tb->buf;
 231 }
 232
 233 /*
 234  * For xdr strings that need to be passed to other kernel api's
 235  * as null-terminated strings.
 236  *
 237  * Note null-terminating in place usually isn't safe since the
 238  * buffer might end on a page boundary.
 239  */
 240 static char *
 241 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 242 {
 243         char *p = svcxdr_tmpalloc(argp, len + 1);
 244
 245         if (!p)
 246                 return NULL;
 247         memcpy(p, buf, len);
 248         p[len] = '\0';
 249         return p;
 250 }
 251
 252 /**
 253  * savemem - duplicate a chunk of memory for later processing
 254  * @argp: NFSv4 compound argument structure to be freed with
 255  * @p: pointer to be duplicated
 256  * @nbytes: length to be duplicated
 257  *
 258  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 259  * that are preserved until processing of the NFSv4 compound
 260  * operation described by @argp finishes.
 261  */
 262 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 263 {
 264         void *ret;
 265
 266         ret = svcxdr_tmpalloc(argp, nbytes);
 267         if (!ret)
 268                 return NULL;
 269         memcpy(ret, p, nbytes);
 270         return ret;
 271 }
 272
 273 /*
 274  * We require the high 32 bits of 'seconds' to be 0, and
 275  * we ignore all 32 bits of 'nseconds'.
 276  */
 277 static __be32
 278 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
 279 {
 280         DECODE_HEAD;
 281         u64 sec;
 282
 283         READ_BUF(12);
 284         p = xdr_decode_hyper(p, &sec);
 285         tv->tv_sec = sec;
 286         tv->tv_nsec = be32_to_cpup(p++);
 287         if (tv->tv_nsec >= (u32)1000000000)
 288                 return nfserr_inval;
 289
 290         DECODE_TAIL;
 291 }
 292
 293 static __be32
 294 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 295 {
 296         u32 bmlen;
 297         DECODE_HEAD;
 298
 299         bmval[0] = 0;
 300         bmval[1] = 0;
 301         bmval[2] = 0;
 302
 303         READ_BUF(4);
 304         bmlen = be32_to_cpup(p++);
 305         if (bmlen > 1000)
 306                 goto xdr_error;
 307
 308         READ_BUF(bmlen << 2);
 309         if (bmlen > 0)
 310                 bmval[0] = be32_to_cpup(p++);
 311         if (bmlen > 1)
 312                 bmval[1] = be32_to_cpup(p++);
 313         if (bmlen > 2)
 314                 bmval[2] = be32_to_cpup(p++);
 315
 316         DECODE_TAIL;
 317 }
 318
 319 static __be32
 320 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 321                    struct iattr *iattr, struct nfs4_acl **acl,
 322                    struct xdr_netobj *label, int *umask)
 323 {
 324         int expected_len, len = 0;
 325         u32 dummy32;
 326         char *buf;
 327
 328         DECODE_HEAD;
 329         iattr->ia_valid = 0;
 330         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 331                 return status;
 332
 333         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 334             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 335             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
 336                 if (nfsd_attrs_supported(argp->minorversion, bmval))
 337                         return nfserr_inval;
 338                 return nfserr_attrnotsupp;
 339         }
 340
 341         READ_BUF(4);
 342         expected_len = be32_to_cpup(p++);
 343
 344         if (bmval[0] & FATTR4_WORD0_SIZE) {
 345                 READ_BUF(8);
 346                 len += 8;
 347                 p = xdr_decode_hyper(p, &iattr->ia_size);
 348                 iattr->ia_valid |= ATTR_SIZE;
 349         }
 350         if (bmval[0] & FATTR4_WORD0_ACL) {
 351                 u32 nace;
 352                 struct nfs4_ace *ace;
 353
 354                 READ_BUF(4); len += 4;
 355                 nace = be32_to_cpup(p++);
 356
 357                 if (nace > NFS4_ACL_MAX)
 358                         return nfserr_fbig;
 359
 360                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
 361                 if (*acl == NULL)
 362                         return nfserr_jukebox;
 363
 364                 (*acl)->naces = nace;
 365                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 366                         READ_BUF(16); len += 16;
 367                         ace->type = be32_to_cpup(p++);
 368                         ace->flag = be32_to_cpup(p++);
 369                         ace->access_mask = be32_to_cpup(p++);
 370                         dummy32 = be32_to_cpup(p++);
 371                         READ_BUF(dummy32);
 372                         len += XDR_QUADLEN(dummy32) << 2;
 373                         READMEM(buf, dummy32);
 374                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 375                         status = nfs_ok;
 376                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 377                                 ;
 378                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 379                                 status = nfsd_map_name_to_gid(argp->rqstp,
 380                                                 buf, dummy32, &ace->who_gid);
 381                         else
 382                                 status = nfsd_map_name_to_uid(argp->rqstp,
 383                                                 buf, dummy32, &ace->who_uid);
 384                         if (status)
 385                                 return status;
 386                 }
 387         } else
 388                 *acl = NULL;
 389         if (bmval[1] & FATTR4_WORD1_MODE) {
 390                 READ_BUF(4);
 391                 len += 4;
 392                 iattr->ia_mode = be32_to_cpup(p++);
 393                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 394                 iattr->ia_valid |= ATTR_MODE;
 395         }
 396         if (bmval[1] & FATTR4_WORD1_OWNER) {
 397                 READ_BUF(4);
 398                 len += 4;
 399                 dummy32 = be32_to_cpup(p++);
 400                 READ_BUF(dummy32);
 401                 len += (XDR_QUADLEN(dummy32) << 2);
 402                 READMEM(buf, dummy32);
 403                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 404                         return status;
 405                 iattr->ia_valid |= ATTR_UID;
 406         }
 407         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 408                 READ_BUF(4);
 409                 len += 4;
 410                 dummy32 = be32_to_cpup(p++);
 411                 READ_BUF(dummy32);
 412                 len += (XDR_QUADLEN(dummy32) << 2);
 413                 READMEM(buf, dummy32);
 414                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 415                         return status;
 416                 iattr->ia_valid |= ATTR_GID;
 417         }
 418         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 419                 READ_BUF(4);
 420                 len += 4;
 421                 dummy32 = be32_to_cpup(p++);
 422                 switch (dummy32) {
 423                 case NFS4_SET_TO_CLIENT_TIME:
 424                         len += 12;
 425                         status = nfsd4_decode_time(argp, &iattr->ia_atime);
 426                         if (status)
 427                                 return status;
 428                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 429                         break;
 430                 case NFS4_SET_TO_SERVER_TIME:
 431                         iattr->ia_valid |= ATTR_ATIME;
 432                         break;
 433                 default:
 434                         goto xdr_error;
 435                 }
 436         }
 437         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 438                 READ_BUF(4);
 439                 len += 4;
 440                 dummy32 = be32_to_cpup(p++);
 441                 switch (dummy32) {
 442                 case NFS4_SET_TO_CLIENT_TIME:
 443                         len += 12;
 444                         status = nfsd4_decode_time(argp, &iattr->ia_mtime);
 445                         if (status)
 446                                 return status;
 447                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 448                         break;
 449                 case NFS4_SET_TO_SERVER_TIME:
 450                         iattr->ia_valid |= ATTR_MTIME;
 451                         break;
 452                 default:
 453                         goto xdr_error;
 454                 }
 455         }
 456
 457         label->len = 0;
 458 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 459         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 460                 READ_BUF(4);
 461                 len += 4;
 462                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 463                 READ_BUF(4);
 464                 len += 4;
 465                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 466                 READ_BUF(4);
 467                 len += 4;
 468                 dummy32 = be32_to_cpup(p++);
 469                 READ_BUF(dummy32);
 470                 if (dummy32 > NFS4_MAXLABELLEN)
 471                         return nfserr_badlabel;
 472                 len += (XDR_QUADLEN(dummy32) << 2);
 473                 READMEM(buf, dummy32);
 474                 label->len = dummy32;
 475                 label->data = svcxdr_dupstr(argp, buf, dummy32);
 476                 if (!label->data)
 477                         return nfserr_jukebox;
 478         }
 479 #endif
 480         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
 481                 if (!umask)
 482                         goto xdr_error;
 483                 READ_BUF(8);
 484                 len += 8;
 485                 dummy32 = be32_to_cpup(p++);
 486                 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
 487                 dummy32 = be32_to_cpup(p++);
 488                 *umask = dummy32 & S_IRWXUGO;
 489                 iattr->ia_valid |= ATTR_MODE;
 490         }
 491         if (len != expected_len)
 492                 goto xdr_error;
 493
 494         DECODE_TAIL;
 495 }
 496
 497 static __be32
 498 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 499 {
 500         DECODE_HEAD;
 501
 502         READ_BUF(sizeof(stateid_t));
 503         sid->si_generation = be32_to_cpup(p++);
 504         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 505
 506         DECODE_TAIL;
 507 }
 508
 509 static __be32
 510 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 511 {
 512         DECODE_HEAD;
 513
 514         READ_BUF(4);
 515         access->ac_req_access = be32_to_cpup(p++);
 516
 517         DECODE_TAIL;
 518 }
 519
 520 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 521 {
 522         DECODE_HEAD;
 523         u32 dummy, uid, gid;
 524         char *machine_name;
 525         int i;
 526         int nr_secflavs;
 527
 528         /* callback_sec_params4 */
 529         READ_BUF(4);
 530         nr_secflavs = be32_to_cpup(p++);
 531         if (nr_secflavs)
 532                 cbs->flavor = (u32)(-1);
 533         else
 534                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 535                 cbs->flavor = 0;
 536         for (i = 0; i < nr_secflavs; ++i) {
 537                 READ_BUF(4);
 538                 dummy = be32_to_cpup(p++);
 539                 switch (dummy) {
 540                 case RPC_AUTH_NULL:
 541                         /* Nothing to read */
 542                         if (cbs->flavor == (u32)(-1))
 543                                 cbs->flavor = RPC_AUTH_NULL;
 544                         break;
 545                 case RPC_AUTH_UNIX:
 546                         READ_BUF(8);
 547                         /* stamp */
 548                         dummy = be32_to_cpup(p++);
 549
 550                         /* machine name */
 551                         dummy = be32_to_cpup(p++);
 552                         READ_BUF(dummy);
 553                         SAVEMEM(machine_name, dummy);
 554
 555                         /* uid, gid */
 556                         READ_BUF(8);
 557                         uid = be32_to_cpup(p++);
 558                         gid = be32_to_cpup(p++);
 559
 560                         /* more gids */
 561                         READ_BUF(4);
 562                         dummy = be32_to_cpup(p++);
 563                         READ_BUF(dummy * 4);
 564                         if (cbs->flavor == (u32)(-1)) {
 565                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 566                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 567                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 568                                         cbs->uid = kuid;
 569                                         cbs->gid = kgid;
 570                                         cbs->flavor = RPC_AUTH_UNIX;
 571                                 } else {
 572                                         dprintk("RPC_AUTH_UNIX with invalid"
 573                                                 "uid or gid ignoring!\n");
 574                                 }
 575                         }
 576                         break;
 577                 case RPC_AUTH_GSS:
 578                         dprintk("RPC_AUTH_GSS callback secflavor "
 579                                 "not supported!\n");
 580                         READ_BUF(8);
 581                         /* gcbp_service */
 582                         dummy = be32_to_cpup(p++);
 583                         /* gcbp_handle_from_server */
 584                         dummy = be32_to_cpup(p++);
 585                         READ_BUF(dummy);
 586                         p += XDR_QUADLEN(dummy);
 587                         /* gcbp_handle_from_client */
 588                         READ_BUF(4);
 589                         dummy = be32_to_cpup(p++);
 590                         READ_BUF(dummy);
 591                         break;
 592                 default:
 593                         dprintk("Illegal callback secflavor\n");
 594                         return nfserr_inval;
 595                 }
 596         }
 597         DECODE_TAIL;
 598 }
 599
 600 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 601 {
 602         DECODE_HEAD;
 603
 604         READ_BUF(4);
 605         bc->bc_cb_program = be32_to_cpup(p++);
 606         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 607
 608         DECODE_TAIL;
 609 }
 610
 611 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 612 {
 613         DECODE_HEAD;
 614
 615         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 616         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 617         bcts->dir = be32_to_cpup(p++);
 618         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 619          * could help us figure out we should be using it. */
 620         DECODE_TAIL;
 621 }
 622
 623 static __be32
 624 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 625 {
 626         DECODE_HEAD;
 627
 628         READ_BUF(4);
 629         close->cl_seqid = be32_to_cpup(p++);
 630         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 631
 632         DECODE_TAIL;
 633 }
 634
 635
 636 static __be32
 637 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 638 {
 639         DECODE_HEAD;
 640
 641         READ_BUF(12);
 642         p = xdr_decode_hyper(p, &commit->co_offset);
 643         commit->co_count = be32_to_cpup(p++);
 644
 645         DECODE_TAIL;
 646 }
 647
 648 static __be32
 649 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 650 {
 651         DECODE_HEAD;
 652
 653         READ_BUF(4);
 654         create->cr_type = be32_to_cpup(p++);
 655         switch (create->cr_type) {
 656         case NF4LNK:
 657                 READ_BUF(4);
 658                 create->cr_datalen = be32_to_cpup(p++);
 659                 READ_BUF(create->cr_datalen);
 660                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 661                 if (!create->cr_data)
 662                         return nfserr_jukebox;
 663                 break;
 664         case NF4BLK:
 665         case NF4CHR:
 666                 READ_BUF(8);
 667                 create->cr_specdata1 = be32_to_cpup(p++);
 668                 create->cr_specdata2 = be32_to_cpup(p++);
 669                 break;
 670         case NF4SOCK:
 671         case NF4FIFO:
 672         case NF4DIR:
 673         default:
 674                 break;
 675         }
 676
 677         READ_BUF(4);
 678         create->cr_namelen = be32_to_cpup(p++);
 679         READ_BUF(create->cr_namelen);
 680         SAVEMEM(create->cr_name, create->cr_namelen);
 681         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 682                 return status;
 683
 684         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 685                                     &create->cr_acl, &create->cr_label,
 686                                     &current->fs->umask);
 687         if (status)
 688                 goto out;
 689
 690         DECODE_TAIL;
 691 }
 692
 693 static inline __be32
 694 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 695 {
 696         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 697 }
 698
 699 static inline __be32
 700 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 701 {
 702         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 703 }
 704
 705 static __be32
 706 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 707 {
 708         DECODE_HEAD;
 709
 710         READ_BUF(4);
 711         link->li_namelen = be32_to_cpup(p++);
 712         READ_BUF(link->li_namelen);
 713         SAVEMEM(link->li_name, link->li_namelen);
 714         if ((status = check_filename(link->li_name, link->li_namelen)))
 715                 return status;
 716
 717         DECODE_TAIL;
 718 }
 719
 720 static __be32
 721 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 722 {
 723         DECODE_HEAD;
 724
 725         /*
 726         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 727         */
 728         READ_BUF(28);
 729         lock->lk_type = be32_to_cpup(p++);
 730         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 731                 goto xdr_error;
 732         lock->lk_reclaim = be32_to_cpup(p++);
 733         p = xdr_decode_hyper(p, &lock->lk_offset);
 734         p = xdr_decode_hyper(p, &lock->lk_length);
 735         lock->lk_is_new = be32_to_cpup(p++);
 736
 737         if (lock->lk_is_new) {
 738                 READ_BUF(4);
 739                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 740                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 741                 if (status)
 742                         return status;
 743                 READ_BUF(8 + sizeof(clientid_t));
 744                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 745                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 746                 lock->lk_new_owner.len = be32_to_cpup(p++);
 747                 READ_BUF(lock->lk_new_owner.len);
 748                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 749         } else {
 750                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 751                 if (status)
 752                         return status;
 753                 READ_BUF(4);
 754                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 755         }
 756
 757         DECODE_TAIL;
 758 }
 759
 760 static __be32
 761 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 762 {
 763         DECODE_HEAD;
 764
 765         READ_BUF(32);
 766         lockt->lt_type = be32_to_cpup(p++);
 767         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 768                 goto xdr_error;
 769         p = xdr_decode_hyper(p, &lockt->lt_offset);
 770         p = xdr_decode_hyper(p, &lockt->lt_length);
 771         COPYMEM(&lockt->lt_clientid, 8);
 772         lockt->lt_owner.len = be32_to_cpup(p++);
 773         READ_BUF(lockt->lt_owner.len);
 774         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 775
 776         DECODE_TAIL;
 777 }
 778
 779 static __be32
 780 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 781 {
 782         DECODE_HEAD;
 783
 784         READ_BUF(8);
 785         locku->lu_type = be32_to_cpup(p++);
 786         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 787                 goto xdr_error;
 788         locku->lu_seqid = be32_to_cpup(p++);
 789         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 790         if (status)
 791                 return status;
 792         READ_BUF(16);
 793         p = xdr_decode_hyper(p, &locku->lu_offset);
 794         p = xdr_decode_hyper(p, &locku->lu_length);
 795
 796         DECODE_TAIL;
 797 }
 798
 799 static __be32
 800 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 801 {
 802         DECODE_HEAD;
 803
 804         READ_BUF(4);
 805         lookup->lo_len = be32_to_cpup(p++);
 806         READ_BUF(lookup->lo_len);
 807         SAVEMEM(lookup->lo_name, lookup->lo_len);
 808         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 809                 return status;
 810
 811         DECODE_TAIL;
 812 }
 813
 814 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 815 {
 816         __be32 *p;
 817         u32 w;
 818
 819         READ_BUF(4);
 820         w = be32_to_cpup(p++);
 821         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 822         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 823         if (deleg_when)
 824                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 825
 826         switch (w & NFS4_SHARE_ACCESS_MASK) {
 827         case NFS4_SHARE_ACCESS_READ:
 828         case NFS4_SHARE_ACCESS_WRITE:
 829         case NFS4_SHARE_ACCESS_BOTH:
 830                 break;
 831         default:
 832                 return nfserr_bad_xdr;
 833         }
 834         w &= ~NFS4_SHARE_ACCESS_MASK;
 835         if (!w)
 836                 return nfs_ok;
 837         if (!argp->minorversion)
 838                 return nfserr_bad_xdr;
 839         switch (w & NFS4_SHARE_WANT_MASK) {
 840         case NFS4_SHARE_WANT_NO_PREFERENCE:
 841         case NFS4_SHARE_WANT_READ_DELEG:
 842         case NFS4_SHARE_WANT_WRITE_DELEG:
 843         case NFS4_SHARE_WANT_ANY_DELEG:
 844         case NFS4_SHARE_WANT_NO_DELEG:
 845         case NFS4_SHARE_WANT_CANCEL:
 846                 break;
 847         default:
 848                 return nfserr_bad_xdr;
 849         }
 850         w &= ~NFS4_SHARE_WANT_MASK;
 851         if (!w)
 852                 return nfs_ok;
 853
 854         if (!deleg_when)        /* open_downgrade */
 855                 return nfserr_inval;
 856         switch (w) {
 857         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 858         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 859         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 860               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 861                 return nfs_ok;
 862         }
 863 xdr_error:
 864         return nfserr_bad_xdr;
 865 }
 866
 867 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 868 {
 869         __be32 *p;
 870
 871         READ_BUF(4);
 872         *x = be32_to_cpup(p++);
 873         /* Note: unlinke access bits, deny bits may be zero. */
 874         if (*x & ~NFS4_SHARE_DENY_BOTH)
 875                 return nfserr_bad_xdr;
 876         return nfs_ok;
 877 xdr_error:
 878         return nfserr_bad_xdr;
 879 }
 880
 881 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 882 {
 883         __be32 *p;
 884
 885         READ_BUF(4);
 886         o->len = be32_to_cpup(p++);
 887
 888         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 889                 return nfserr_bad_xdr;
 890
 891         READ_BUF(o->len);
 892         SAVEMEM(o->data, o->len);
 893         return nfs_ok;
 894 xdr_error:
 895         return nfserr_bad_xdr;
 896 }
 897
 898 static __be32
 899 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 900 {
 901         DECODE_HEAD;
 902         u32 dummy;
 903
 904         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 905         open->op_iattr.ia_valid = 0;
 906         open->op_openowner = NULL;
 907
 908         open->op_xdr_error = 0;
 909         /* seqid, share_access, share_deny, clientid, ownerlen */
 910         READ_BUF(4);
 911         open->op_seqid = be32_to_cpup(p++);
 912         /* decode, yet ignore deleg_when until supported */
 913         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 914                                            &open->op_deleg_want, &dummy);
 915         if (status)
 916                 goto xdr_error;
 917         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 918         if (status)
 919                 goto xdr_error;
 920         READ_BUF(sizeof(clientid_t));
 921         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 922         status = nfsd4_decode_opaque(argp, &open->op_owner);
 923         if (status)
 924                 goto xdr_error;
 925         READ_BUF(4);
 926         open->op_create = be32_to_cpup(p++);
 927         switch (open->op_create) {
 928         case NFS4_OPEN_NOCREATE:
 929                 break;
 930         case NFS4_OPEN_CREATE:
 931                 current->fs->umask = 0;
 932                 READ_BUF(4);
 933                 open->op_createmode = be32_to_cpup(p++);
 934                 switch (open->op_createmode) {
 935                 case NFS4_CREATE_UNCHECKED:
 936                 case NFS4_CREATE_GUARDED:
 937                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 938                                 &open->op_iattr, &open->op_acl, &open->op_label,
 939                                 &current->fs->umask);
 940                         if (status)
 941                                 goto out;
 942                         break;
 943                 case NFS4_CREATE_EXCLUSIVE:
 944                         READ_BUF(NFS4_VERIFIER_SIZE);
 945                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 946                         break;
 947                 case NFS4_CREATE_EXCLUSIVE4_1:
 948                         if (argp->minorversion < 1)
 949                                 goto xdr_error;
 950                         READ_BUF(NFS4_VERIFIER_SIZE);
 951                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 952                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 953                                 &open->op_iattr, &open->op_acl, &open->op_label,
 954                                 &current->fs->umask);
 955                         if (status)
 956                                 goto out;
 957                         break;
 958                 default:
 959                         goto xdr_error;
 960                 }
 961                 break;
 962         default:
 963                 goto xdr_error;
 964         }
 965
 966         /* open_claim */
 967         READ_BUF(4);
 968         open->op_claim_type = be32_to_cpup(p++);
 969         switch (open->op_claim_type) {
 970         case NFS4_OPEN_CLAIM_NULL:
 971         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 972                 READ_BUF(4);
 973                 open->op_fname.len = be32_to_cpup(p++);
 974                 READ_BUF(open->op_fname.len);
 975                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 976                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 977                         return status;
 978                 break;
 979         case NFS4_OPEN_CLAIM_PREVIOUS:
 980                 READ_BUF(4);
 981                 open->op_delegate_type = be32_to_cpup(p++);
 982                 break;
 983         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 984                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 985                 if (status)
 986                         return status;
 987                 READ_BUF(4);
 988                 open->op_fname.len = be32_to_cpup(p++);
 989                 READ_BUF(open->op_fname.len);
 990                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 991                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 992                         return status;
 993                 break;
 994         case NFS4_OPEN_CLAIM_FH:
 995         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 996                 if (argp->minorversion < 1)
 997                         goto xdr_error;
 998                 /* void */
 999                 break;
1000         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1001                 if (argp->minorversion < 1)
1002                         goto xdr_error;
1003                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1004                 if (status)
1005                         return status;
1006                 break;
1007         default:
1008                 goto xdr_error;
1009         }
1010
1011         DECODE_TAIL;
1012 }
1013
1014 static __be32
1015 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1016 {
1017         DECODE_HEAD;
1018
1019         if (argp->minorversion >= 1)
1020                 return nfserr_notsupp;
1021
1022         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1023         if (status)
1024                 return status;
1025         READ_BUF(4);
1026         open_conf->oc_seqid = be32_to_cpup(p++);
1027
1028         DECODE_TAIL;
1029 }
1030
1031 static __be32
1032 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1033 {
1034         DECODE_HEAD;
1035
1036         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1037         if (status)
1038                 return status;
1039         READ_BUF(4);
1040         open_down->od_seqid = be32_to_cpup(p++);
1041         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1042                                            &open_down->od_deleg_want, NULL);
1043         if (status)
1044                 return status;
1045         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1046         if (status)
1047                 return status;
1048         DECODE_TAIL;
1049 }
1050
1051 static __be32
1052 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1053 {
1054         DECODE_HEAD;
1055
1056         READ_BUF(4);
1057         putfh->pf_fhlen = be32_to_cpup(p++);
1058         if (putfh->pf_fhlen > NFS4_FHSIZE)
1059                 goto xdr_error;
1060         READ_BUF(putfh->pf_fhlen);
1061         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1062
1063         DECODE_TAIL;
1064 }
1065
1066 static __be32
1067 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1068 {
1069         if (argp->minorversion == 0)
1070                 return nfs_ok;
1071         return nfserr_notsupp;
1072 }
1073
1074 static __be32
1075 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1076 {
1077         DECODE_HEAD;
1078
1079         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1080         if (status)
1081                 return status;
1082         READ_BUF(12);
1083         p = xdr_decode_hyper(p, &read->rd_offset);
1084         read->rd_length = be32_to_cpup(p++);
1085
1086         DECODE_TAIL;
1087 }
1088
1089 static __be32
1090 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1091 {
1092         DECODE_HEAD;
1093
1094         READ_BUF(24);
1095         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1096         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1097         readdir->rd_dircount = be32_to_cpup(p++);
1098         readdir->rd_maxcount = be32_to_cpup(p++);
1099         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1100                 goto out;
1101
1102         DECODE_TAIL;
1103 }
1104
1105 static __be32
1106 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1107 {
1108         DECODE_HEAD;
1109
1110         READ_BUF(4);
1111         remove->rm_namelen = be32_to_cpup(p++);
1112         READ_BUF(remove->rm_namelen);
1113         SAVEMEM(remove->rm_name, remove->rm_namelen);
1114         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1115                 return status;
1116
1117         DECODE_TAIL;
1118 }
1119
1120 static __be32
1121 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1122 {
1123         DECODE_HEAD;
1124
1125         READ_BUF(4);
1126         rename->rn_snamelen = be32_to_cpup(p++);
1127         READ_BUF(rename->rn_snamelen);
1128         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1129         READ_BUF(4);
1130         rename->rn_tnamelen = be32_to_cpup(p++);
1131         READ_BUF(rename->rn_tnamelen);
1132         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1133         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1134                 return status;
1135         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1136                 return status;
1137
1138         DECODE_TAIL;
1139 }
1140
1141 static __be32
1142 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1143 {
1144         DECODE_HEAD;
1145
1146         if (argp->minorversion >= 1)
1147                 return nfserr_notsupp;
1148
1149         READ_BUF(sizeof(clientid_t));
1150         COPYMEM(clientid, sizeof(clientid_t));
1151
1152         DECODE_TAIL;
1153 }
1154
1155 static __be32
1156 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1157                      struct nfsd4_secinfo *secinfo)
1158 {
1159         DECODE_HEAD;
1160
1161         READ_BUF(4);
1162         secinfo->si_namelen = be32_to_cpup(p++);
1163         READ_BUF(secinfo->si_namelen);
1164         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1165         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1166         if (status)
1167                 return status;
1168         DECODE_TAIL;
1169 }
1170
1171 static __be32
1172 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1173                      struct nfsd4_secinfo_no_name *sin)
1174 {
1175         DECODE_HEAD;
1176
1177         READ_BUF(4);
1178         sin->sin_style = be32_to_cpup(p++);
1179         DECODE_TAIL;
1180 }
1181
1182 static __be32
1183 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1184 {
1185         __be32 status;
1186
1187         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1188         if (status)
1189                 return status;
1190         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1191                                   &setattr->sa_acl, &setattr->sa_label, NULL);
1192 }
1193
1194 static __be32
1195 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1196 {
1197         DECODE_HEAD;
1198
1199         if (argp->minorversion >= 1)
1200                 return nfserr_notsupp;
1201
1202         READ_BUF(NFS4_VERIFIER_SIZE);
1203         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1204
1205         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1206         if (status)
1207                 return nfserr_bad_xdr;
1208         READ_BUF(8);
1209         setclientid->se_callback_prog = be32_to_cpup(p++);
1210         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1211         READ_BUF(setclientid->se_callback_netid_len);
1212         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1213         READ_BUF(4);
1214         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1215
1216         READ_BUF(setclientid->se_callback_addr_len);
1217         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1218         READ_BUF(4);
1219         setclientid->se_callback_ident = be32_to_cpup(p++);
1220
1221         DECODE_TAIL;
1222 }
1223
1224 static __be32
1225 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1226 {
1227         DECODE_HEAD;
1228
1229         if (argp->minorversion >= 1)
1230                 return nfserr_notsupp;
1231
1232         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1233         COPYMEM(&scd_c->sc_clientid, 8);
1234         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1235
1236         DECODE_TAIL;
1237 }
1238
1239 /* Also used for NVERIFY */
1240 static __be32
1241 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1242 {
1243         DECODE_HEAD;
1244
1245         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1246                 goto out;
1247
1248         /* For convenience's sake, we compare raw xdr'd attributes in
1249          * nfsd4_proc_verify */
1250
1251         READ_BUF(4);
1252         verify->ve_attrlen = be32_to_cpup(p++);
1253         READ_BUF(verify->ve_attrlen);
1254         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1255
1256         DECODE_TAIL;
1257 }
1258
1259 static __be32
1260 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1261 {
1262         int avail;
1263         int len;
1264         DECODE_HEAD;
1265
1266         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1267         if (status)
1268                 return status;
1269         READ_BUF(16);
1270         p = xdr_decode_hyper(p, &write->wr_offset);
1271         write->wr_stable_how = be32_to_cpup(p++);
1272         if (write->wr_stable_how > NFS_FILE_SYNC)
1273                 goto xdr_error;
1274         write->wr_buflen = be32_to_cpup(p++);
1275
1276         /* Sorry .. no magic macros for this.. *
1277          * READ_BUF(write->wr_buflen);
1278          * SAVEMEM(write->wr_buf, write->wr_buflen);
1279          */
1280         avail = (char*)argp->end - (char*)argp->p;
1281         if (avail + argp->pagelen < write->wr_buflen) {
1282                 dprintk("NFSD: xdr error (%s:%d)\n",
1283                                 __FILE__, __LINE__);
1284                 goto xdr_error;
1285         }
1286         write->wr_head.iov_base = p;
1287         write->wr_head.iov_len = avail;
1288         write->wr_pagelist = argp->pagelist;
1289
1290         len = XDR_QUADLEN(write->wr_buflen) << 2;
1291         if (len >= avail) {
1292                 int pages;
1293
1294                 len -= avail;
1295
1296                 pages = len >> PAGE_SHIFT;
1297                 argp->pagelist += pages;
1298                 argp->pagelen -= pages * PAGE_SIZE;
1299                 len -= pages * PAGE_SIZE;
1300
1301                 next_decode_page(argp);
1302         }
1303         argp->p += XDR_QUADLEN(len);
1304
1305         DECODE_TAIL;
1306 }
1307
1308 static __be32
1309 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1310 {
1311         DECODE_HEAD;
1312
1313         if (argp->minorversion >= 1)
1314                 return nfserr_notsupp;
1315
1316         READ_BUF(12);
1317         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1318         rlockowner->rl_owner.len = be32_to_cpup(p++);
1319         READ_BUF(rlockowner->rl_owner.len);
1320         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1321
1322         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1323                 return nfserr_inval;
1324         DECODE_TAIL;
1325 }
1326
1327 static __be32
1328 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1329                          struct nfsd4_exchange_id *exid)
1330 {
1331         int dummy, tmp;
1332         DECODE_HEAD;
1333
1334         READ_BUF(NFS4_VERIFIER_SIZE);
1335         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1336
1337         status = nfsd4_decode_opaque(argp, &exid->clname);
1338         if (status)
1339                 return nfserr_bad_xdr;
1340
1341         READ_BUF(4);
1342         exid->flags = be32_to_cpup(p++);
1343
1344         /* Ignore state_protect4_a */
1345         READ_BUF(4);
1346         exid->spa_how = be32_to_cpup(p++);
1347         switch (exid->spa_how) {
1348         case SP4_NONE:
1349                 break;
1350         case SP4_MACH_CRED:
1351                 /* spo_must_enforce */
1352                 status = nfsd4_decode_bitmap(argp,
1353                                         exid->spo_must_enforce);
1354                 if (status)
1355                         goto out;
1356                 /* spo_must_allow */
1357                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1358                 if (status)
1359                         goto out;
1360                 break;
1361         case SP4_SSV:
1362                 /* ssp_ops */
1363                 READ_BUF(4);
1364                 dummy = be32_to_cpup(p++);
1365                 READ_BUF(dummy * 4);
1366                 p += dummy;
1367
1368                 READ_BUF(4);
1369                 dummy = be32_to_cpup(p++);
1370                 READ_BUF(dummy * 4);
1371                 p += dummy;
1372
1373                 /* ssp_hash_algs<> */
1374                 READ_BUF(4);
1375                 tmp = be32_to_cpup(p++);
1376                 while (tmp--) {
1377                         READ_BUF(4);
1378                         dummy = be32_to_cpup(p++);
1379                         READ_BUF(dummy);
1380                         p += XDR_QUADLEN(dummy);
1381                 }
1382
1383                 /* ssp_encr_algs<> */
1384                 READ_BUF(4);
1385                 tmp = be32_to_cpup(p++);
1386                 while (tmp--) {
1387                         READ_BUF(4);
1388                         dummy = be32_to_cpup(p++);
1389                         READ_BUF(dummy);
1390                         p += XDR_QUADLEN(dummy);
1391                 }
1392
1393                 /* ssp_window and ssp_num_gss_handles */
1394                 READ_BUF(8);
1395                 dummy = be32_to_cpup(p++);
1396                 dummy = be32_to_cpup(p++);
1397                 break;
1398         default:
1399                 goto xdr_error;
1400         }
1401
1402         /* Ignore Implementation ID */
1403         READ_BUF(4);    /* nfs_impl_id4 array length */
1404         dummy = be32_to_cpup(p++);
1405
1406         if (dummy > 1)
1407                 goto xdr_error;
1408
1409         if (dummy == 1) {
1410                 /* nii_domain */
1411                 READ_BUF(4);
1412                 dummy = be32_to_cpup(p++);
1413                 READ_BUF(dummy);
1414                 p += XDR_QUADLEN(dummy);
1415
1416                 /* nii_name */
1417                 READ_BUF(4);
1418                 dummy = be32_to_cpup(p++);
1419                 READ_BUF(dummy);
1420                 p += XDR_QUADLEN(dummy);
1421
1422                 /* nii_date */
1423                 READ_BUF(12);
1424                 p += 3;
1425         }
1426         DECODE_TAIL;
1427 }
1428
1429 static __be32
1430 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1431                             struct nfsd4_create_session *sess)
1432 {
1433         DECODE_HEAD;
1434         u32 dummy;
1435
1436         READ_BUF(16);
1437         COPYMEM(&sess->clientid, 8);
1438         sess->seqid = be32_to_cpup(p++);
1439         sess->flags = be32_to_cpup(p++);
1440
1441         /* Fore channel attrs */
1442         READ_BUF(28);
1443         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1444         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1445         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1446         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1447         sess->fore_channel.maxops = be32_to_cpup(p++);
1448         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1449         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1450         if (sess->fore_channel.nr_rdma_attrs == 1) {
1451                 READ_BUF(4);
1452                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1453         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1454                 dprintk("Too many fore channel attr bitmaps!\n");
1455                 goto xdr_error;
1456         }
1457
1458         /* Back channel attrs */
1459         READ_BUF(28);
1460         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1461         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1462         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1463         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1464         sess->back_channel.maxops = be32_to_cpup(p++);
1465         sess->back_channel.maxreqs = be32_to_cpup(p++);
1466         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1467         if (sess->back_channel.nr_rdma_attrs == 1) {
1468                 READ_BUF(4);
1469                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1470         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1471                 dprintk("Too many back channel attr bitmaps!\n");
1472                 goto xdr_error;
1473         }
1474
1475         READ_BUF(4);
1476         sess->callback_prog = be32_to_cpup(p++);
1477         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1478         DECODE_TAIL;
1479 }
1480
1481 static __be32
1482 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1483                              struct nfsd4_destroy_session *destroy_session)
1484 {
1485         DECODE_HEAD;
1486         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1487         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1488
1489         DECODE_TAIL;
1490 }
1491
1492 static __be32
1493 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1494                           struct nfsd4_free_stateid *free_stateid)
1495 {
1496         DECODE_HEAD;
1497
1498         READ_BUF(sizeof(stateid_t));
1499         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1500         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1501
1502         DECODE_TAIL;
1503 }
1504
1505 static __be32
1506 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1507                       struct nfsd4_sequence *seq)
1508 {
1509         DECODE_HEAD;
1510
1511         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1512         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1513         seq->seqid = be32_to_cpup(p++);
1514         seq->slotid = be32_to_cpup(p++);
1515         seq->maxslots = be32_to_cpup(p++);
1516         seq->cachethis = be32_to_cpup(p++);
1517
1518         DECODE_TAIL;
1519 }
1520
1521 static __be32
1522 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1523 {
1524         int i;
1525         __be32 *p, status;
1526         struct nfsd4_test_stateid_id *stateid;
1527
1528         READ_BUF(4);
1529         test_stateid->ts_num_ids = ntohl(*p++);
1530
1531         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1532
1533         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1534                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1535                 if (!stateid) {
1536                         status = nfserrno(-ENOMEM);
1537                         goto out;
1538                 }
1539
1540                 INIT_LIST_HEAD(&stateid->ts_id_list);
1541                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1542
1543                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1544                 if (status)
1545                         goto out;
1546         }
1547
1548         status = 0;
1549 out:
1550         return status;
1551 xdr_error:
1552         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1553         status = nfserr_bad_xdr;
1554         goto out;
1555 }
1556
1557 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1558 {
1559         DECODE_HEAD;
1560
1561         READ_BUF(8);
1562         COPYMEM(&dc->clientid, 8);
1563
1564         DECODE_TAIL;
1565 }
1566
1567 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1568 {
1569         DECODE_HEAD;
1570
1571         READ_BUF(4);
1572         rc->rca_one_fs = be32_to_cpup(p++);
1573
1574         DECODE_TAIL;
1575 }
1576
1577 #ifdef CONFIG_NFSD_PNFS
1578 static __be32
1579 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1580                 struct nfsd4_getdeviceinfo *gdev)
1581 {
1582         DECODE_HEAD;
1583         u32 num, i;
1584
1585         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1586         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1587         gdev->gd_layout_type = be32_to_cpup(p++);
1588         gdev->gd_maxcount = be32_to_cpup(p++);
1589         num = be32_to_cpup(p++);
1590         if (num) {
1591                 READ_BUF(4 * num);
1592                 gdev->gd_notify_types = be32_to_cpup(p++);
1593                 for (i = 1; i < num; i++) {
1594                         if (be32_to_cpup(p++)) {
1595                                 status = nfserr_inval;
1596                                 goto out;
1597                         }
1598                 }
1599         }
1600         DECODE_TAIL;
1601 }
1602
1603 static __be32
1604 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1605                 struct nfsd4_layoutget *lgp)
1606 {
1607         DECODE_HEAD;
1608
1609         READ_BUF(36);
1610         lgp->lg_signal = be32_to_cpup(p++);
1611         lgp->lg_layout_type = be32_to_cpup(p++);
1612         lgp->lg_seg.iomode = be32_to_cpup(p++);
1613         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1614         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1615         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1616
1617         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1618         if (status)
1619                 return status;
1620
1621         READ_BUF(4);
1622         lgp->lg_maxcount = be32_to_cpup(p++);
1623
1624         DECODE_TAIL;
1625 }
1626
1627 static __be32
1628 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1629                 struct nfsd4_layoutcommit *lcp)
1630 {
1631         DECODE_HEAD;
1632         u32 timechange;
1633
1634         READ_BUF(20);
1635         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1636         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1637         lcp->lc_reclaim = be32_to_cpup(p++);
1638
1639         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1640         if (status)
1641                 return status;
1642
1643         READ_BUF(4);
1644         lcp->lc_newoffset = be32_to_cpup(p++);
1645         if (lcp->lc_newoffset) {
1646                 READ_BUF(8);
1647                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1648         } else
1649                 lcp->lc_last_wr = 0;
1650         READ_BUF(4);
1651         timechange = be32_to_cpup(p++);
1652         if (timechange) {
1653                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1654                 if (status)
1655                         return status;
1656         } else {
1657                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1658         }
1659         READ_BUF(8);
1660         lcp->lc_layout_type = be32_to_cpup(p++);
1661
1662         /*
1663          * Save the layout update in XDR format and let the layout driver deal
1664          * with it later.
1665          */
1666         lcp->lc_up_len = be32_to_cpup(p++);
1667         if (lcp->lc_up_len > 0) {
1668                 READ_BUF(lcp->lc_up_len);
1669                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1670         }
1671
1672         DECODE_TAIL;
1673 }
1674
1675 static __be32
1676 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1677                 struct nfsd4_layoutreturn *lrp)
1678 {
1679         DECODE_HEAD;
1680
1681         READ_BUF(16);
1682         lrp->lr_reclaim = be32_to_cpup(p++);
1683         lrp->lr_layout_type = be32_to_cpup(p++);
1684         lrp->lr_seg.iomode = be32_to_cpup(p++);
1685         lrp->lr_return_type = be32_to_cpup(p++);
1686         if (lrp->lr_return_type == RETURN_FILE) {
1687                 READ_BUF(16);
1688                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1689                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1690
1691                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1692                 if (status)
1693                         return status;
1694
1695                 READ_BUF(4);
1696                 lrp->lrf_body_len = be32_to_cpup(p++);
1697                 if (lrp->lrf_body_len > 0) {
1698                         READ_BUF(lrp->lrf_body_len);
1699                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1700                 }
1701         } else {
1702                 lrp->lr_seg.offset = 0;
1703                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1704         }
1705
1706         DECODE_TAIL;
1707 }
1708 #endif /* CONFIG_NFSD_PNFS */
1709
1710 static __be32
1711 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1712                        struct nfsd4_fallocate *fallocate)
1713 {
1714         DECODE_HEAD;
1715
1716         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1717         if (status)
1718                 return status;
1719
1720         READ_BUF(16);
1721         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1722         xdr_decode_hyper(p, &fallocate->falloc_length);
1723
1724         DECODE_TAIL;
1725 }
1726
1727 static __be32
1728 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1729 {
1730         DECODE_HEAD;
1731
1732         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1733         if (status)
1734                 return status;
1735         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1736         if (status)
1737                 return status;
1738
1739         READ_BUF(8 + 8 + 8);
1740         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1741         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1742         p = xdr_decode_hyper(p, &clone->cl_count);
1743         DECODE_TAIL;
1744 }
1745
1746 static __be32
1747 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1748 {
1749         DECODE_HEAD;
1750         unsigned int tmp;
1751
1752         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1753         if (status)
1754                 return status;
1755         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1756         if (status)
1757                 return status;
1758
1759         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1760         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1761         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1762         p = xdr_decode_hyper(p, &copy->cp_count);
1763         copy->cp_consecutive = be32_to_cpup(p++);
1764         copy->cp_synchronous = be32_to_cpup(p++);
1765         tmp = be32_to_cpup(p); /* Source server list not supported */
1766
1767         DECODE_TAIL;
1768 }
1769
1770 static __be32
1771 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1772 {
1773         DECODE_HEAD;
1774
1775         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1776         if (status)
1777                 return status;
1778
1779         READ_BUF(8 + 4);
1780         p = xdr_decode_hyper(p, &seek->seek_offset);
1781         seek->seek_whence = be32_to_cpup(p);
1782
1783         DECODE_TAIL;
1784 }
1785
1786 static __be32
1787 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1788 {
1789         return nfs_ok;
1790 }
1791
1792 static __be32
1793 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1794 {
1795         return nfserr_notsupp;
1796 }
1797
1798 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1799
1800 static const nfsd4_dec nfsd4_dec_ops[] = {
1801         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1802         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1803         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1804         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1805         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1806         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1807         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1808         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1809         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1810         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1811         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1812         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1813         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1814         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1815         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1816         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1817         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1818         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1819         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1820         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1821         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1822         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1823         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1824         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1825         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1826         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1827         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1828         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1829         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1830         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1831         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1832         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1833         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1834         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1835         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1836         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1837         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1838
1839         /* new operations for NFSv4.1 */
1840         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1841         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1842         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1843         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1844         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1845         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1846         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1847 #ifdef CONFIG_NFSD_PNFS
1848         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1849         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1850         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1851         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1852         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1853 #else
1854         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1855         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1856         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1857         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1858         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1859 #endif
1860         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1861         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1862         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1863         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1864         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1865         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1866         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1867
1868         /* new operations for NFSv4.2 */
1869         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1870         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1871         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1872         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1873         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1874         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1875         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1876         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1877         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1878         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1879         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1880         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1881         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1882 };
1883
1884 static inline bool
1885 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1886 {
1887         if (op->opnum < FIRST_NFS4_OP)
1888                 return false;
1889         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1890                 return false;
1891         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1892                 return false;
1893         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1894                 return false;
1895         return true;
1896 }
1897
1898 static __be32
1899 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1900 {
1901         DECODE_HEAD;
1902         struct nfsd4_op *op;
1903         bool cachethis = false;
1904         int auth_slack= argp->rqstp->rq_auth_slack;
1905         int max_reply = auth_slack + 8; /* opcnt, status */
1906         int readcount = 0;
1907         int readbytes = 0;
1908         int i;
1909
1910         READ_BUF(4);
1911         argp->taglen = be32_to_cpup(p++);
1912         READ_BUF(argp->taglen);
1913         SAVEMEM(argp->tag, argp->taglen);
1914         READ_BUF(8);
1915         argp->minorversion = be32_to_cpup(p++);
1916         argp->opcnt = be32_to_cpup(p++);
1917         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1918
1919         if (argp->taglen > NFSD4_MAX_TAGLEN)
1920                 goto xdr_error;
1921         if (argp->opcnt > 100)
1922                 goto xdr_error;
1923
1924         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1925                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1926                 if (!argp->ops) {
1927                         argp->ops = argp->iops;
1928                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1929                         goto xdr_error;
1930                 }
1931         }
1932
1933         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1934                 argp->opcnt = 0;
1935
1936         for (i = 0; i < argp->opcnt; i++) {
1937                 op = &argp->ops[i];
1938                 op->replay = NULL;
1939
1940                 READ_BUF(4);
1941                 op->opnum = be32_to_cpup(p++);
1942
1943                 if (nfsd4_opnum_in_range(argp, op))
1944                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1945                 else {
1946                         op->opnum = OP_ILLEGAL;
1947                         op->status = nfserr_op_illegal;
1948                 }
1949                 op->opdesc = OPDESC(op);
1950                 /*
1951                  * We'll try to cache the result in the DRC if any one
1952                  * op in the compound wants to be cached:
1953                  */
1954                 cachethis |= nfsd4_cache_this_op(op);
1955
1956                 if (op->opnum == OP_READ) {
1957                         readcount++;
1958                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1959                 } else
1960                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1961                 /*
1962                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
1963                  * (Special case because it will just skip encoding this
1964                  * if it runs out of xdr buffer space, and it is the only
1965                  * operation that behaves this way.)
1966                  */
1967                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1968                         max_reply += NFS4_OPAQUE_LIMIT;
1969
1970                 if (op->status) {
1971                         argp->opcnt = i+1;
1972                         break;
1973                 }
1974         }
1975         /* Sessions make the DRC unnecessary: */
1976         if (argp->minorversion)
1977                 cachethis = false;
1978         svc_reserve(argp->rqstp, max_reply + readbytes);
1979         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1980
1981         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1982                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1983
1984         DECODE_TAIL;
1985 }
1986
1987 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
1988                              struct svc_export *exp)
1989 {
1990         if (exp->ex_flags & NFSEXP_V4ROOT) {
1991                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
1992                 *p++ = 0;
1993         } else if (IS_I_VERSION(inode)) {
1994                 p = xdr_encode_hyper(p, nfsd4_change_attribute(inode));
1995         } else {
1996                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1997                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1998         }
1999         return p;
2000 }
2001
2002 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2003 {
2004         *p++ = cpu_to_be32(c->atomic);
2005         if (c->change_supported) {
2006                 p = xdr_encode_hyper(p, c->before_change);
2007                 p = xdr_encode_hyper(p, c->after_change);
2008         } else {
2009                 *p++ = cpu_to_be32(c->before_ctime_sec);
2010                 *p++ = cpu_to_be32(c->before_ctime_nsec);
2011                 *p++ = cpu_to_be32(c->after_ctime_sec);
2012                 *p++ = cpu_to_be32(c->after_ctime_nsec);
2013         }
2014         return p;
2015 }
2016
2017 /* Encode as an array of strings the string given with components
2018  * separated @sep, escaped with esc_enter and esc_exit.
2019  */
2020 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2021                                           char *components, char esc_enter,
2022                                           char esc_exit)
2023 {
2024         __be32 *p;
2025         __be32 pathlen;
2026         int pathlen_offset;
2027         int strlen, count=0;
2028         char *str, *end, *next;
2029
2030         dprintk("nfsd4_encode_components(%s)\n", components);
2031
2032         pathlen_offset = xdr->buf->len;
2033         p = xdr_reserve_space(xdr, 4);
2034         if (!p)
2035                 return nfserr_resource;
2036         p++; /* We will fill this in with @count later */
2037
2038         end = str = components;
2039         while (*end) {
2040                 bool found_esc = false;
2041
2042                 /* try to parse as esc_start, ..., esc_end, sep */
2043                 if (*str == esc_enter) {
2044                         for (; *end && (*end != esc_exit); end++)
2045                                 /* find esc_exit or end of string */;
2046                         next = end + 1;
2047                         if (*end && (!*next || *next == sep)) {
2048                                 str++;
2049                                 found_esc = true;
2050                         }
2051                 }
2052
2053                 if (!found_esc)
2054                         for (; *end && (*end != sep); end++)
2055                                 /* find sep or end of string */;
2056
2057                 strlen = end - str;
2058                 if (strlen) {
2059                         p = xdr_reserve_space(xdr, strlen + 4);
2060                         if (!p)
2061                                 return nfserr_resource;
2062                         p = xdr_encode_opaque(p, str, strlen);
2063                         count++;
2064                 }
2065                 else
2066                         end++;
2067                 if (found_esc)
2068                         end = next;
2069
2070                 str = end;
2071         }
2072         pathlen = htonl(count);
2073         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2074         return 0;
2075 }
2076
2077 /* Encode as an array of strings the string given with components
2078  * separated @sep.
2079  */
2080 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2081                                       char *components)
2082 {
2083         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2084 }
2085
2086 /*
2087  * encode a location element of a fs_locations structure
2088  */
2089 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2090                                         struct nfsd4_fs_location *location)
2091 {
2092         __be32 status;
2093
2094         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2095                                                 '[', ']');
2096         if (status)
2097                 return status;
2098         status = nfsd4_encode_components(xdr, '/', location->path);
2099         if (status)
2100                 return status;
2101         return 0;
2102 }
2103
2104 /*
2105  * Encode a path in RFC3530 'pathname4' format
2106  */
2107 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2108                                 const struct path *root,
2109                                 const struct path *path)
2110 {
2111         struct path cur = *path;
2112         __be32 *p;
2113         struct dentry **components = NULL;
2114         unsigned int ncomponents = 0;
2115         __be32 err = nfserr_jukebox;
2116
2117         dprintk("nfsd4_encode_components(");
2118
2119         path_get(&cur);
2120         /* First walk the path up to the nfsd root, and store the
2121          * dentries/path components in an array.
2122          */
2123         for (;;) {
2124                 if (path_equal(&cur, root))
2125                         break;
2126                 if (cur.dentry == cur.mnt->mnt_root) {
2127                         if (follow_up(&cur))
2128                                 continue;
2129                         goto out_free;
2130                 }
2131                 if ((ncomponents & 15) == 0) {
2132                         struct dentry **new;
2133                         new = krealloc(components,
2134                                         sizeof(*new) * (ncomponents + 16),
2135                                         GFP_KERNEL);
2136                         if (!new)
2137                                 goto out_free;
2138                         components = new;
2139                 }
2140                 components[ncomponents++] = cur.dentry;
2141                 cur.dentry = dget_parent(cur.dentry);
2142         }
2143         err = nfserr_resource;
2144         p = xdr_reserve_space(xdr, 4);
2145         if (!p)
2146                 goto out_free;
2147         *p++ = cpu_to_be32(ncomponents);
2148
2149         while (ncomponents) {
2150                 struct dentry *dentry = components[ncomponents - 1];
2151                 unsigned int len;
2152
2153                 spin_lock(&dentry->d_lock);
2154                 len = dentry->d_name.len;
2155                 p = xdr_reserve_space(xdr, len + 4);
2156                 if (!p) {
2157                         spin_unlock(&dentry->d_lock);
2158                         goto out_free;
2159                 }
2160                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2161                 dprintk("/%pd", dentry);
2162                 spin_unlock(&dentry->d_lock);
2163                 dput(dentry);
2164                 ncomponents--;
2165         }
2166
2167         err = 0;
2168 out_free:
2169         dprintk(")\n");
2170         while (ncomponents)
2171                 dput(components[--ncomponents]);
2172         kfree(components);
2173         path_put(&cur);
2174         return err;
2175 }
2176
2177 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2178                         struct svc_rqst *rqstp, const struct path *path)
2179 {
2180         struct svc_export *exp_ps;
2181         __be32 res;
2182
2183         exp_ps = rqst_find_fsidzero_export(rqstp);
2184         if (IS_ERR(exp_ps))
2185                 return nfserrno(PTR_ERR(exp_ps));
2186         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2187         exp_put(exp_ps);
2188         return res;
2189 }
2190
2191 /*
2192  *  encode a fs_locations structure
2193  */
2194 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2195                         struct svc_rqst *rqstp, struct svc_export *exp)
2196 {
2197         __be32 status;
2198         int i;
2199         __be32 *p;
2200         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2201
2202         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2203         if (status)
2204                 return status;
2205         p = xdr_reserve_space(xdr, 4);
2206         if (!p)
2207                 return nfserr_resource;
2208         *p++ = cpu_to_be32(fslocs->locations_count);
2209         for (i=0; i<fslocs->locations_count; i++) {
2210                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2211                 if (status)
2212                         return status;
2213         }
2214         return 0;
2215 }
2216
2217 static u32 nfs4_file_type(umode_t mode)
2218 {
2219         switch (mode & S_IFMT) {
2220         case S_IFIFO:   return NF4FIFO;
2221         case S_IFCHR:   return NF4CHR;
2222         case S_IFDIR:   return NF4DIR;
2223         case S_IFBLK:   return NF4BLK;
2224         case S_IFLNK:   return NF4LNK;
2225         case S_IFREG:   return NF4REG;
2226         case S_IFSOCK:  return NF4SOCK;
2227         default:        return NF4BAD;
2228         };
2229 }
2230
2231 static inline __be32
2232 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2233                      struct nfs4_ace *ace)
2234 {
2235         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2236                 return nfs4_acl_write_who(xdr, ace->whotype);
2237         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2238                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2239         else
2240                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2241 }
2242
2243 static inline __be32
2244 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2245 {
2246         __be32          *p;
2247         unsigned long   i = hweight_long(layout_types);
2248
2249         p = xdr_reserve_space(xdr, 4 + 4 * i);
2250         if (!p)
2251                 return nfserr_resource;
2252
2253         *p++ = cpu_to_be32(i);
2254
2255         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2256                 if (layout_types & (1 << i))
2257                         *p++ = cpu_to_be32(i);
2258
2259         return 0;
2260 }
2261
2262 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2263                               FATTR4_WORD0_RDATTR_ERROR)
2264 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2265 #define WORD2_ABSENT_FS_ATTRS 0
2266
2267 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2268 static inline __be32
2269 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2270                             void *context, int len)
2271 {
2272         __be32 *p;
2273
2274         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2275         if (!p)
2276                 return nfserr_resource;
2277
2278         /*
2279          * For now we use a 0 here to indicate the null translation; in
2280          * the future we may place a call to translation code here.
2281          */
2282         *p++ = cpu_to_be32(0); /* lfs */
2283         *p++ = cpu_to_be32(0); /* pi */
2284         p = xdr_encode_opaque(p, context, len);
2285         return 0;
2286 }
2287 #else
2288 static inline __be32
2289 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2290                             void *context, int len)
2291 { return 0; }
2292 #endif
2293
2294 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2295 {
2296         /* As per referral draft:  */
2297         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2298             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2299                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2300                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2301                         *rdattr_err = NFSERR_MOVED;
2302                 else
2303                         return nfserr_moved;
2304         }
2305         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2306         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2307         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2308         return 0;
2309 }
2310
2311
2312 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2313 {
2314         struct path path = exp->ex_path;
2315         int err;
2316
2317         path_get(&path);
2318         while (follow_up(&path)) {
2319                 if (path.dentry != path.mnt->mnt_root)
2320                         break;
2321         }
2322         err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2323         path_put(&path);
2324         return err;
2325 }
2326
2327 static __be32
2328 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2329 {
2330         __be32 *p;
2331
2332         if (bmval2) {
2333                 p = xdr_reserve_space(xdr, 16);
2334                 if (!p)
2335                         goto out_resource;
2336                 *p++ = cpu_to_be32(3);
2337                 *p++ = cpu_to_be32(bmval0);
2338                 *p++ = cpu_to_be32(bmval1);
2339                 *p++ = cpu_to_be32(bmval2);
2340         } else if (bmval1) {
2341                 p = xdr_reserve_space(xdr, 12);
2342                 if (!p)
2343                         goto out_resource;
2344                 *p++ = cpu_to_be32(2);
2345                 *p++ = cpu_to_be32(bmval0);
2346                 *p++ = cpu_to_be32(bmval1);
2347         } else {
2348                 p = xdr_reserve_space(xdr, 8);
2349                 if (!p)
2350                         goto out_resource;
2351                 *p++ = cpu_to_be32(1);
2352                 *p++ = cpu_to_be32(bmval0);
2353         }
2354
2355         return 0;
2356 out_resource:
2357         return nfserr_resource;
2358 }
2359
2360 /*
2361  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2362  * ourselves.
2363  */
2364 static __be32
2365 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2366                 struct svc_export *exp,
2367                 struct dentry *dentry, u32 *bmval,
2368                 struct svc_rqst *rqstp, int ignore_crossmnt)
2369 {
2370         u32 bmval0 = bmval[0];
2371         u32 bmval1 = bmval[1];
2372         u32 bmval2 = bmval[2];
2373         struct kstat stat;
2374         struct svc_fh *tempfh = NULL;
2375         struct kstatfs statfs;
2376         __be32 *p;
2377         int starting_len = xdr->buf->len;
2378         int attrlen_offset;
2379         __be32 attrlen;
2380         u32 dummy;
2381         u64 dummy64;
2382         u32 rdattr_err = 0;
2383         __be32 status;
2384         int err;
2385         struct nfs4_acl *acl = NULL;
2386         void *context = NULL;
2387         int contextlen;
2388         bool contextsupport = false;
2389         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2390         u32 minorversion = resp->cstate.minorversion;
2391         struct path path = {
2392                 .mnt    = exp->ex_path.mnt,
2393                 .dentry = dentry,
2394         };
2395         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2396
2397         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2398         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2399
2400         if (exp->ex_fslocs.migrated) {
2401                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2402                 if (status)
2403                         goto out;
2404         }
2405
2406         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2407         if (err)
2408                 goto out_nfserr;
2409         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2410                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2411             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2412                        FATTR4_WORD1_SPACE_TOTAL))) {
2413                 err = vfs_statfs(&path, &statfs);
2414                 if (err)
2415                         goto out_nfserr;
2416         }
2417         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2418                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2419                 status = nfserr_jukebox;
2420                 if (!tempfh)
2421                         goto out;
2422                 fh_init(tempfh, NFS4_FHSIZE);
2423                 status = fh_compose(tempfh, exp, dentry, NULL);
2424                 if (status)
2425                         goto out;
2426                 fhp = tempfh;
2427         }
2428         if (bmval0 & FATTR4_WORD0_ACL) {
2429                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2430                 if (err == -EOPNOTSUPP)
2431                         bmval0 &= ~FATTR4_WORD0_ACL;
2432                 else if (err == -EINVAL) {
2433                         status = nfserr_attrnotsupp;
2434                         goto out;
2435                 } else if (err != 0)
2436                         goto out_nfserr;
2437         }
2438
2439 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2440         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2441              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2442                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2443                         err = security_inode_getsecctx(d_inode(dentry),
2444                                                 &context, &contextlen);
2445                 else
2446                         err = -EOPNOTSUPP;
2447                 contextsupport = (err == 0);
2448                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2449                         if (err == -EOPNOTSUPP)
2450                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2451                         else if (err)
2452                                 goto out_nfserr;
2453                 }
2454         }
2455 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2456
2457         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2458         if (status)
2459                 goto out;
2460
2461         attrlen_offset = xdr->buf->len;
2462         p = xdr_reserve_space(xdr, 4);
2463         if (!p)
2464                 goto out_resource;
2465         p++;                /* to be backfilled later */
2466
2467         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2468                 u32 supp[3];
2469
2470                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2471
2472                 if (!IS_POSIXACL(dentry->d_inode))
2473                         supp[0] &= ~FATTR4_WORD0_ACL;
2474                 if (!contextsupport)
2475                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2476                 if (!supp[2]) {
2477                         p = xdr_reserve_space(xdr, 12);
2478                         if (!p)
2479                                 goto out_resource;
2480                         *p++ = cpu_to_be32(2);
2481                         *p++ = cpu_to_be32(supp[0]);
2482                         *p++ = cpu_to_be32(supp[1]);
2483                 } else {
2484                         p = xdr_reserve_space(xdr, 16);
2485                         if (!p)
2486                                 goto out_resource;
2487                         *p++ = cpu_to_be32(3);
2488                         *p++ = cpu_to_be32(supp[0]);
2489                         *p++ = cpu_to_be32(supp[1]);
2490                         *p++ = cpu_to_be32(supp[2]);
2491                 }
2492         }
2493         if (bmval0 & FATTR4_WORD0_TYPE) {
2494                 p = xdr_reserve_space(xdr, 4);
2495                 if (!p)
2496                         goto out_resource;
2497                 dummy = nfs4_file_type(stat.mode);
2498                 if (dummy == NF4BAD) {
2499                         status = nfserr_serverfault;
2500                         goto out;
2501                 }
2502                 *p++ = cpu_to_be32(dummy);
2503         }
2504         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2505                 p = xdr_reserve_space(xdr, 4);
2506                 if (!p)
2507                         goto out_resource;
2508                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2509                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2510                 else
2511                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2512                                                 NFS4_FH_VOL_RENAME);
2513         }
2514         if (bmval0 & FATTR4_WORD0_CHANGE) {
2515                 p = xdr_reserve_space(xdr, 8);
2516                 if (!p)
2517                         goto out_resource;
2518                 p = encode_change(p, &stat, d_inode(dentry), exp);
2519         }
2520         if (bmval0 & FATTR4_WORD0_SIZE) {
2521                 p = xdr_reserve_space(xdr, 8);
2522                 if (!p)
2523                         goto out_resource;
2524                 p = xdr_encode_hyper(p, stat.size);
2525         }
2526         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2527                 p = xdr_reserve_space(xdr, 4);
2528                 if (!p)
2529                         goto out_resource;
2530                 *p++ = cpu_to_be32(1);
2531         }
2532         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2533                 p = xdr_reserve_space(xdr, 4);
2534                 if (!p)
2535                         goto out_resource;
2536                 *p++ = cpu_to_be32(1);
2537         }
2538         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2539                 p = xdr_reserve_space(xdr, 4);
2540                 if (!p)
2541                         goto out_resource;
2542                 *p++ = cpu_to_be32(0);
2543         }
2544         if (bmval0 & FATTR4_WORD0_FSID) {
2545                 p = xdr_reserve_space(xdr, 16);
2546                 if (!p)
2547                         goto out_resource;
2548                 if (exp->ex_fslocs.migrated) {
2549                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2550                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2551                 } else switch(fsid_source(fhp)) {
2552                 case FSIDSOURCE_FSID:
2553                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2554                         p = xdr_encode_hyper(p, (u64)0);
2555                         break;
2556                 case FSIDSOURCE_DEV:
2557                         *p++ = cpu_to_be32(0);
2558                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2559                         *p++ = cpu_to_be32(0);
2560                         *p++ = cpu_to_be32(MINOR(stat.dev));
2561                         break;
2562                 case FSIDSOURCE_UUID:
2563                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2564                                                                 EX_UUID_LEN);
2565                         break;
2566                 }
2567         }
2568         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2569                 p = xdr_reserve_space(xdr, 4);
2570                 if (!p)
2571                         goto out_resource;
2572                 *p++ = cpu_to_be32(0);
2573         }
2574         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2575                 p = xdr_reserve_space(xdr, 4);
2576                 if (!p)
2577                         goto out_resource;
2578                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2579         }
2580         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2581                 p = xdr_reserve_space(xdr, 4);
2582                 if (!p)
2583                         goto out_resource;
2584                 *p++ = cpu_to_be32(rdattr_err);
2585         }
2586         if (bmval0 & FATTR4_WORD0_ACL) {
2587                 struct nfs4_ace *ace;
2588
2589                 if (acl == NULL) {
2590                         p = xdr_reserve_space(xdr, 4);
2591                         if (!p)
2592                                 goto out_resource;
2593
2594                         *p++ = cpu_to_be32(0);
2595                         goto out_acl;
2596                 }
2597                 p = xdr_reserve_space(xdr, 4);
2598                 if (!p)
2599                         goto out_resource;
2600                 *p++ = cpu_to_be32(acl->naces);
2601
2602                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2603                         p = xdr_reserve_space(xdr, 4*3);
2604                         if (!p)
2605                                 goto out_resource;
2606                         *p++ = cpu_to_be32(ace->type);
2607                         *p++ = cpu_to_be32(ace->flag);
2608                         *p++ = cpu_to_be32(ace->access_mask &
2609                                                         NFS4_ACE_MASK_ALL);
2610                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2611                         if (status)
2612                                 goto out;
2613                 }
2614         }
2615 out_acl:
2616         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2617                 p = xdr_reserve_space(xdr, 4);
2618                 if (!p)
2619                         goto out_resource;
2620                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2621                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2622         }
2623         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2624                 p = xdr_reserve_space(xdr, 4);
2625                 if (!p)
2626                         goto out_resource;
2627                 *p++ = cpu_to_be32(1);
2628         }
2629         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2630                 p = xdr_reserve_space(xdr, 4);
2631                 if (!p)
2632                         goto out_resource;
2633                 *p++ = cpu_to_be32(0);
2634         }
2635         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2636                 p = xdr_reserve_space(xdr, 4);
2637                 if (!p)
2638                         goto out_resource;
2639                 *p++ = cpu_to_be32(1);
2640         }
2641         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2642                 p = xdr_reserve_space(xdr, 4);
2643                 if (!p)
2644                         goto out_resource;
2645                 *p++ = cpu_to_be32(1);
2646         }
2647         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2648                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2649                 if (!p)
2650                         goto out_resource;
2651                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2652                                         fhp->fh_handle.fh_size);
2653         }
2654         if (bmval0 & FATTR4_WORD0_FILEID) {
2655                 p = xdr_reserve_space(xdr, 8);
2656                 if (!p)
2657                         goto out_resource;
2658                 p = xdr_encode_hyper(p, stat.ino);
2659         }
2660         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2661                 p = xdr_reserve_space(xdr, 8);
2662                 if (!p)
2663                         goto out_resource;
2664                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2665         }
2666         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2667                 p = xdr_reserve_space(xdr, 8);
2668                 if (!p)
2669                         goto out_resource;
2670                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2671         }
2672         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2673                 p = xdr_reserve_space(xdr, 8);
2674                 if (!p)
2675                         goto out_resource;
2676                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2677         }
2678         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2679                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2680                 if (status)
2681                         goto out;
2682         }
2683         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2684                 p = xdr_reserve_space(xdr, 4);
2685                 if (!p)
2686                         goto out_resource;
2687                 *p++ = cpu_to_be32(1);
2688         }
2689         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2690                 p = xdr_reserve_space(xdr, 8);
2691                 if (!p)
2692                         goto out_resource;
2693                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2694         }
2695         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2696                 p = xdr_reserve_space(xdr, 4);
2697                 if (!p)
2698                         goto out_resource;
2699                 *p++ = cpu_to_be32(255);
2700         }
2701         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2702                 p = xdr_reserve_space(xdr, 4);
2703                 if (!p)
2704                         goto out_resource;
2705                 *p++ = cpu_to_be32(statfs.f_namelen);
2706         }
2707         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2708                 p = xdr_reserve_space(xdr, 8);
2709                 if (!p)
2710                         goto out_resource;
2711                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2712         }
2713         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2714                 p = xdr_reserve_space(xdr, 8);
2715                 if (!p)
2716                         goto out_resource;
2717                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2718         }
2719         if (bmval1 & FATTR4_WORD1_MODE) {
2720                 p = xdr_reserve_space(xdr, 4);
2721                 if (!p)
2722                         goto out_resource;
2723                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2724         }
2725         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2726                 p = xdr_reserve_space(xdr, 4);
2727                 if (!p)
2728                         goto out_resource;
2729                 *p++ = cpu_to_be32(1);
2730         }
2731         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2732                 p = xdr_reserve_space(xdr, 4);
2733                 if (!p)
2734                         goto out_resource;
2735                 *p++ = cpu_to_be32(stat.nlink);
2736         }
2737         if (bmval1 & FATTR4_WORD1_OWNER) {
2738                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2739                 if (status)
2740                         goto out;
2741         }
2742         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2743                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2744                 if (status)
2745                         goto out;
2746         }
2747         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2748                 p = xdr_reserve_space(xdr, 8);
2749                 if (!p)
2750                         goto out_resource;
2751                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2752                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2753         }
2754         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2755                 p = xdr_reserve_space(xdr, 8);
2756                 if (!p)
2757                         goto out_resource;
2758                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2759                 p = xdr_encode_hyper(p, dummy64);
2760         }
2761         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2762                 p = xdr_reserve_space(xdr, 8);
2763                 if (!p)
2764                         goto out_resource;
2765                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2766                 p = xdr_encode_hyper(p, dummy64);
2767         }
2768         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2769                 p = xdr_reserve_space(xdr, 8);
2770                 if (!p)
2771                         goto out_resource;
2772                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2773                 p = xdr_encode_hyper(p, dummy64);
2774         }
2775         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2776                 p = xdr_reserve_space(xdr, 8);
2777                 if (!p)
2778                         goto out_resource;
2779                 dummy64 = (u64)stat.blocks << 9;
2780                 p = xdr_encode_hyper(p, dummy64);
2781         }
2782         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2783                 p = xdr_reserve_space(xdr, 12);
2784                 if (!p)
2785                         goto out_resource;
2786                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2787                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2788         }
2789         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2790                 p = xdr_reserve_space(xdr, 12);
2791                 if (!p)
2792                         goto out_resource;
2793                 *p++ = cpu_to_be32(0);
2794                 *p++ = cpu_to_be32(1);
2795                 *p++ = cpu_to_be32(0);
2796         }
2797         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2798                 p = xdr_reserve_space(xdr, 12);
2799                 if (!p)
2800                         goto out_resource;
2801                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2802                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2803         }
2804         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2805                 p = xdr_reserve_space(xdr, 12);
2806                 if (!p)
2807                         goto out_resource;
2808                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2809                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2810         }
2811         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2812                 struct kstat parent_stat;
2813                 u64 ino = stat.ino;
2814
2815                 p = xdr_reserve_space(xdr, 8);
2816                 if (!p)
2817                         goto out_resource;
2818                 /*
2819                  * Get parent's attributes if not ignoring crossmount
2820                  * and this is the root of a cross-mounted filesystem.
2821                  */
2822                 if (ignore_crossmnt == 0 &&
2823                     dentry == exp->ex_path.mnt->mnt_root) {
2824                         err = get_parent_attributes(exp, &parent_stat);
2825                         if (err)
2826                                 goto out_nfserr;
2827                         ino = parent_stat.ino;
2828                 }
2829                 p = xdr_encode_hyper(p, ino);
2830         }
2831 #ifdef CONFIG_NFSD_PNFS
2832         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2833                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2834                 if (status)
2835                         goto out;
2836         }
2837
2838         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2839                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2840                 if (status)
2841                         goto out;
2842         }
2843
2844         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2845                 p = xdr_reserve_space(xdr, 4);
2846                 if (!p)
2847                         goto out_resource;
2848                 *p++ = cpu_to_be32(stat.blksize);
2849         }
2850 #endif /* CONFIG_NFSD_PNFS */
2851         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2852                 u32 supp[3];
2853
2854                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2855                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2856                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2857                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2858
2859                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2860                 if (status)
2861                         goto out;
2862         }
2863
2864         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2865                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2866                                                                 contextlen);
2867                 if (status)
2868                         goto out;
2869         }
2870
2871         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2872         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2873         status = nfs_ok;
2874
2875 out:
2876 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2877         if (context)
2878                 security_release_secctx(context, contextlen);
2879 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2880         kfree(acl);
2881         if (tempfh) {
2882                 fh_put(tempfh);
2883                 kfree(tempfh);
2884         }
2885         if (status)
2886                 xdr_truncate_encode(xdr, starting_len);
2887         return status;
2888 out_nfserr:
2889         status = nfserrno(err);
2890         goto out;
2891 out_resource:
2892         status = nfserr_resource;
2893         goto out;
2894 }
2895
2896 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2897                                 struct xdr_buf *buf, __be32 *p, int bytes)
2898 {
2899         xdr->scratch.iov_len = 0;
2900         memset(buf, 0, sizeof(struct xdr_buf));
2901         buf->head[0].iov_base = p;
2902         buf->head[0].iov_len = 0;
2903         buf->len = 0;
2904         xdr->buf = buf;
2905         xdr->iov = buf->head;
2906         xdr->p = p;
2907         xdr->end = (void *)p + bytes;
2908         buf->buflen = bytes;
2909 }
2910
2911 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2912                         struct svc_fh *fhp, struct svc_export *exp,
2913                         struct dentry *dentry, u32 *bmval,
2914                         struct svc_rqst *rqstp, int ignore_crossmnt)
2915 {
2916         struct xdr_buf dummy;
2917         struct xdr_stream xdr;
2918         __be32 ret;
2919
2920         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2921         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2922                                                         ignore_crossmnt);
2923         *p = xdr.p;
2924         return ret;
2925 }
2926
2927 static inline int attributes_need_mount(u32 *bmval)
2928 {
2929         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2930                 return 1;
2931         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2932                 return 1;
2933         return 0;
2934 }
2935
2936 static __be32
2937 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2938                         const char *name, int namlen)
2939 {
2940         struct svc_export *exp = cd->rd_fhp->fh_export;
2941         struct dentry *dentry;
2942         __be32 nfserr;
2943         int ignore_crossmnt = 0;
2944
2945         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2946         if (IS_ERR(dentry))
2947                 return nfserrno(PTR_ERR(dentry));
2948         if (d_really_is_negative(dentry)) {
2949                 /*
2950                  * we're not holding the i_mutex here, so there's
2951                  * a window where this directory entry could have gone
2952                  * away.
2953                  */
2954                 dput(dentry);
2955                 return nfserr_noent;
2956         }
2957
2958         exp_get(exp);
2959         /*
2960          * In the case of a mountpoint, the client may be asking for
2961          * attributes that are only properties of the underlying filesystem
2962          * as opposed to the cross-mounted file system. In such a case,
2963          * we will not follow the cross mount and will fill the attribtutes
2964          * directly from the mountpoint dentry.
2965          */
2966         if (nfsd_mountpoint(dentry, exp)) {
2967                 int err;
2968
2969                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2970                                 && !attributes_need_mount(cd->rd_bmval)) {
2971                         ignore_crossmnt = 1;
2972                         goto out_encode;
2973                 }
2974                 /*
2975                  * Why the heck aren't we just using nfsd_lookup??
2976                  * Different "."/".." handling?  Something else?
2977                  * At least, add a comment here to explain....
2978                  */
2979                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2980                 if (err) {
2981                         nfserr = nfserrno(err);
2982                         goto out_put;
2983                 }
2984                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2985                 if (nfserr)
2986                         goto out_put;
2987
2988         }
2989 out_encode:
2990         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2991                                         cd->rd_rqstp, ignore_crossmnt);
2992 out_put:
2993         dput(dentry);
2994         exp_put(exp);
2995         return nfserr;
2996 }
2997
2998 static __be32 *
2999 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3000 {
3001         __be32 *p;
3002
3003         p = xdr_reserve_space(xdr, 20);
3004         if (!p)
3005                 return NULL;
3006         *p++ = htonl(2);
3007         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3008         *p++ = htonl(0);                         /* bmval1 */
3009
3010         *p++ = htonl(4);     /* attribute length */
3011         *p++ = nfserr;       /* no htonl */
3012         return p;
3013 }
3014
3015 static int
3016 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3017                     loff_t offset, u64 ino, unsigned int d_type)
3018 {
3019         struct readdir_cd *ccd = ccdv;
3020         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3021         struct xdr_stream *xdr = cd->xdr;
3022         int start_offset = xdr->buf->len;
3023         int cookie_offset;
3024         u32 name_and_cookie;
3025         int entry_bytes;
3026         __be32 nfserr = nfserr_toosmall;
3027         __be64 wire_offset;
3028         __be32 *p;
3029
3030         /* In nfsv4, "." and ".." never make it onto the wire.. */
3031         if (name && isdotent(name, namlen)) {
3032                 cd->common.err = nfs_ok;
3033                 return 0;
3034         }
3035
3036         if (cd->cookie_offset) {
3037                 wire_offset = cpu_to_be64(offset);
3038                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3039                                                         &wire_offset, 8);
3040         }
3041
3042         p = xdr_reserve_space(xdr, 4);
3043         if (!p)
3044                 goto fail;
3045         *p++ = xdr_one;                             /* mark entry present */
3046         cookie_offset = xdr->buf->len;
3047         p = xdr_reserve_space(xdr, 3*4 + namlen);
3048         if (!p)
3049                 goto fail;
3050         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3051         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3052
3053         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3054         switch (nfserr) {
3055         case nfs_ok:
3056                 break;
3057         case nfserr_resource:
3058                 nfserr = nfserr_toosmall;
3059                 goto fail;
3060         case nfserr_noent:
3061                 xdr_truncate_encode(xdr, start_offset);
3062                 goto skip_entry;
3063         default:
3064                 /*
3065                  * If the client requested the RDATTR_ERROR attribute,
3066                  * we stuff the error code into this attribute
3067                  * and continue.  If this attribute was not requested,
3068                  * then in accordance with the spec, we fail the
3069                  * entire READDIR operation(!)
3070                  */
3071                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3072                         goto fail;
3073                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3074                 if (p == NULL) {
3075                         nfserr = nfserr_toosmall;
3076                         goto fail;
3077                 }
3078         }
3079         nfserr = nfserr_toosmall;
3080         entry_bytes = xdr->buf->len - start_offset;
3081         if (entry_bytes > cd->rd_maxcount)
3082                 goto fail;
3083         cd->rd_maxcount -= entry_bytes;
3084         /*
3085          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3086          * let's always let through the first entry, at least:
3087          */
3088         if (!cd->rd_dircount)
3089                 goto fail;
3090         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3091         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3092                 goto fail;
3093         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3094
3095         cd->cookie_offset = cookie_offset;
3096 skip_entry:
3097         cd->common.err = nfs_ok;
3098         return 0;
3099 fail:
3100         xdr_truncate_encode(xdr, start_offset);
3101         cd->common.err = nfserr;
3102         return -EINVAL;
3103 }
3104
3105 static __be32
3106 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3107 {
3108         __be32 *p;
3109
3110         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3111         if (!p)
3112                 return nfserr_resource;
3113         *p++ = cpu_to_be32(sid->si_generation);
3114         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3115                                         sizeof(stateid_opaque_t));
3116         return 0;
3117 }
3118
3119 static __be32
3120 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3121 {
3122         struct xdr_stream *xdr = &resp->xdr;
3123         __be32 *p;
3124
3125         p = xdr_reserve_space(xdr, 8);
3126         if (!p)
3127                 return nfserr_resource;
3128         *p++ = cpu_to_be32(access->ac_supported);
3129         *p++ = cpu_to_be32(access->ac_resp_access);
3130         return 0;
3131 }
3132
3133 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3134 {
3135         struct xdr_stream *xdr = &resp->xdr;
3136         __be32 *p;
3137
3138         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3139         if (!p)
3140                 return nfserr_resource;
3141         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3142                                         NFS4_MAX_SESSIONID_LEN);
3143         *p++ = cpu_to_be32(bcts->dir);
3144         /* Upshifting from TCP to RDMA is not supported */
3145         *p++ = cpu_to_be32(0);
3146         return 0;
3147 }
3148
3149 static __be32
3150 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3151 {
3152         struct xdr_stream *xdr = &resp->xdr;
3153
3154         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3155 }
3156
3157
3158 static __be32
3159 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3160 {
3161         struct xdr_stream *xdr = &resp->xdr;
3162         __be32 *p;
3163
3164         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3165         if (!p)
3166                 return nfserr_resource;
3167         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3168                                                 NFS4_VERIFIER_SIZE);
3169         return 0;
3170 }
3171
3172 static __be32
3173 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3174 {
3175         struct xdr_stream *xdr = &resp->xdr;
3176         __be32 *p;
3177
3178         p = xdr_reserve_space(xdr, 20);
3179         if (!p)
3180                 return nfserr_resource;
3181         encode_cinfo(p, &create->cr_cinfo);
3182         nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3183                         create->cr_bmval[1], create->cr_bmval[2]);
3184         return 0;
3185 }
3186
3187 static __be32
3188 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3189 {
3190         struct svc_fh *fhp = getattr->ga_fhp;
3191         struct xdr_stream *xdr = &resp->xdr;
3192
3193         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3194                                     getattr->ga_bmval, resp->rqstp, 0);
3195 }
3196
3197 static __be32
3198 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3199 {
3200         struct xdr_stream *xdr = &resp->xdr;
3201         struct svc_fh *fhp = *fhpp;
3202         unsigned int len;
3203         __be32 *p;
3204
3205         len = fhp->fh_handle.fh_size;
3206         p = xdr_reserve_space(xdr, len + 4);
3207         if (!p)
3208                 return nfserr_resource;
3209         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3210         return 0;
3211 }
3212
3213 /*
3214 * Including all fields other than the name, a LOCK4denied structure requires
3215 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3216 */
3217 static __be32
3218 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3219 {
3220         struct xdr_netobj *conf = &ld->ld_owner;
3221         __be32 *p;
3222
3223 again:
3224         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3225         if (!p) {
3226                 /*
3227                  * Don't fail to return the result just because we can't
3228                  * return the conflicting open:
3229                  */
3230                 if (conf->len) {
3231                         kfree(conf->data);
3232                         conf->len = 0;
3233                         conf->data = NULL;
3234                         goto again;
3235                 }
3236                 return nfserr_resource;
3237         }
3238         p = xdr_encode_hyper(p, ld->ld_start);
3239         p = xdr_encode_hyper(p, ld->ld_length);
3240         *p++ = cpu_to_be32(ld->ld_type);
3241         if (conf->len) {
3242                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3243                 p = xdr_encode_opaque(p, conf->data, conf->len);
3244                 kfree(conf->data);
3245         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3246                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3247                 *p++ = cpu_to_be32(0); /* length of owner name */
3248         }
3249         return nfserr_denied;
3250 }
3251
3252 static __be32
3253 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3254 {
3255         struct xdr_stream *xdr = &resp->xdr;
3256
3257         if (!nfserr)
3258                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3259         else if (nfserr == nfserr_denied)
3260                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3261
3262         return nfserr;
3263 }
3264
3265 static __be32
3266 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3267 {
3268         struct xdr_stream *xdr = &resp->xdr;
3269
3270         if (nfserr == nfserr_denied)
3271                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3272         return nfserr;
3273 }
3274
3275 static __be32
3276 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3277 {
3278         struct xdr_stream *xdr = &resp->xdr;
3279
3280         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3281 }
3282
3283
3284 static __be32
3285 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3286 {
3287         struct xdr_stream *xdr = &resp->xdr;
3288         __be32 *p;
3289
3290         p = xdr_reserve_space(xdr, 20);
3291         if (!p)
3292                 return nfserr_resource;
3293         p = encode_cinfo(p, &link->li_cinfo);
3294         return 0;
3295 }
3296
3297
3298 static __be32
3299 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3300 {
3301         struct xdr_stream *xdr = &resp->xdr;
3302         __be32 *p;
3303
3304         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3305         if (nfserr)
3306                 return nfserr;
3307         p = xdr_reserve_space(xdr, 24);
3308         if (!p)
3309                 return nfserr_resource;
3310         p = encode_cinfo(p, &open->op_cinfo);
3311         *p++ = cpu_to_be32(open->op_rflags);
3312
3313         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3314                                         open->op_bmval[2]);
3315         if (nfserr)
3316                 return nfserr;
3317
3318         p = xdr_reserve_space(xdr, 4);
3319         if (!p)
3320                 return nfserr_resource;
3321
3322         *p++ = cpu_to_be32(open->op_delegate_type);
3323         switch (open->op_delegate_type) {
3324         case NFS4_OPEN_DELEGATE_NONE:
3325                 break;
3326         case NFS4_OPEN_DELEGATE_READ:
3327                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3328                 if (nfserr)
3329                         return nfserr;
3330                 p = xdr_reserve_space(xdr, 20);
3331                 if (!p)
3332                         return nfserr_resource;
3333                 *p++ = cpu_to_be32(open->op_recall);
3334
3335                 /*
3336                  * TODO: ACE's in delegations
3337                  */
3338                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3339                 *p++ = cpu_to_be32(0);
3340                 *p++ = cpu_to_be32(0);
3341                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3342                 break;
3343         case NFS4_OPEN_DELEGATE_WRITE:
3344                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3345                 if (nfserr)
3346                         return nfserr;
3347                 p = xdr_reserve_space(xdr, 32);
3348                 if (!p)
3349                         return nfserr_resource;
3350                 *p++ = cpu_to_be32(0);
3351
3352                 /*
3353                  * TODO: space_limit's in delegations
3354                  */
3355                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3356                 *p++ = cpu_to_be32(~(u32)0);
3357                 *p++ = cpu_to_be32(~(u32)0);
3358
3359                 /*
3360                  * TODO: ACE's in delegations
3361                  */
3362                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3363                 *p++ = cpu_to_be32(0);
3364                 *p++ = cpu_to_be32(0);
3365                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3366                 break;
3367         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3368                 switch (open->op_why_no_deleg) {
3369                 case WND4_CONTENTION:
3370                 case WND4_RESOURCE:
3371                         p = xdr_reserve_space(xdr, 8);
3372                         if (!p)
3373                                 return nfserr_resource;
3374                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3375                         /* deleg signaling not supported yet: */
3376                         *p++ = cpu_to_be32(0);
3377                         break;
3378                 default:
3379                         p = xdr_reserve_space(xdr, 4);
3380                         if (!p)
3381                                 return nfserr_resource;
3382                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3383                 }
3384                 break;
3385         default:
3386                 BUG();
3387         }
3388         /* XXX save filehandle here */
3389         return 0;
3390 }
3391
3392 static __be32
3393 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3394 {
3395         struct xdr_stream *xdr = &resp->xdr;
3396
3397         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3398 }
3399
3400 static __be32
3401 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3402 {
3403         struct xdr_stream *xdr = &resp->xdr;
3404
3405         return nfsd4_encode_stateid(xdr, &od->od_stateid);
3406 }
3407
3408 static __be32 nfsd4_encode_splice_read(
3409                                 struct nfsd4_compoundres *resp,
3410                                 struct nfsd4_read *read,
3411                                 struct file *file, unsigned long maxcount)
3412 {
3413         struct xdr_stream *xdr = &resp->xdr;
3414         struct xdr_buf *buf = xdr->buf;
3415         u32 eof;
3416         long len;
3417         int space_left;
3418         __be32 nfserr;
3419         __be32 *p = xdr->p - 2;
3420
3421         /* Make sure there will be room for padding if needed */
3422         if (xdr->end - xdr->p < 1)
3423                 return nfserr_resource;
3424
3425         len = maxcount;
3426         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3427                                   read->rd_offset, &maxcount);
3428         if (nfserr) {
3429                 /*
3430                  * nfsd_splice_actor may have already messed with the
3431                  * page length; reset it so as not to confuse
3432                  * xdr_truncate_encode:
3433                  */
3434                 buf->page_len = 0;
3435                 return nfserr;
3436         }
3437
3438         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3439                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3440
3441         *(p++) = htonl(eof);
3442         *(p++) = htonl(maxcount);
3443
3444         buf->page_len = maxcount;
3445         buf->len += maxcount;
3446         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3447                                                         / PAGE_SIZE;
3448
3449         /* Use rest of head for padding and remaining ops: */
3450         buf->tail[0].iov_base = xdr->p;
3451         buf->tail[0].iov_len = 0;
3452         xdr->iov = buf->tail;
3453         if (maxcount&3) {
3454                 int pad = 4 - (maxcount&3);
3455
3456                 *(xdr->p++) = 0;
3457
3458                 buf->tail[0].iov_base += maxcount&3;
3459                 buf->tail[0].iov_len = pad;
3460                 buf->len += pad;
3461         }
3462
3463         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3464                                 buf->buflen - buf->len);
3465         buf->buflen = buf->len + space_left;
3466         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3467
3468         return 0;
3469 }
3470
3471 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3472                                  struct nfsd4_read *read,
3473                                  struct file *file, unsigned long maxcount)
3474 {
3475         struct xdr_stream *xdr = &resp->xdr;
3476         u32 eof;
3477         int v;
3478         int starting_len = xdr->buf->len - 8;
3479         long len;
3480         int thislen;
3481         __be32 nfserr;
3482         __be32 tmp;
3483         __be32 *p;
3484         u32 zzz = 0;
3485         int pad;
3486
3487         len = maxcount;
3488         v = 0;
3489
3490         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3491         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3492         WARN_ON_ONCE(!p);
3493         resp->rqstp->rq_vec[v].iov_base = p;
3494         resp->rqstp->rq_vec[v].iov_len = thislen;
3495         v++;
3496         len -= thislen;
3497
3498         while (len) {
3499                 thislen = min_t(long, len, PAGE_SIZE);
3500                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3501                 WARN_ON_ONCE(!p);
3502                 resp->rqstp->rq_vec[v].iov_base = p;
3503                 resp->rqstp->rq_vec[v].iov_len = thislen;
3504                 v++;
3505                 len -= thislen;
3506         }
3507         read->rd_vlen = v;
3508
3509         len = maxcount;
3510         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3511                         read->rd_vlen, &maxcount);
3512         if (nfserr)
3513                 return nfserr;
3514         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3515
3516         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3517                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3518
3519         tmp = htonl(eof);
3520         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3521         tmp = htonl(maxcount);
3522         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3523
3524         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3525         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3526                                                                 &zzz, pad);
3527         return 0;
3528
3529 }
3530
3531 static __be32
3532 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3533                   struct nfsd4_read *read)
3534 {
3535         unsigned long maxcount;
3536         struct xdr_stream *xdr = &resp->xdr;
3537         struct file *file = read->rd_filp;
3538         int starting_len = xdr->buf->len;
3539         struct raparms *ra = NULL;
3540         __be32 *p;
3541
3542         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3543         if (!p) {
3544                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3545                 return nfserr_resource;
3546         }
3547         if (resp->xdr.buf->page_len &&
3548             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3549                 WARN_ON_ONCE(1);
3550                 return nfserr_resource;
3551         }
3552         xdr_commit_encode(xdr);
3553
3554         maxcount = svc_max_payload(resp->rqstp);
3555         maxcount = min_t(unsigned long, maxcount,
3556                          (xdr->buf->buflen - xdr->buf->len));
3557         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3558
3559         if (read->rd_tmp_file)
3560                 ra = nfsd_init_raparms(file);
3561
3562         if (file->f_op->splice_read &&
3563             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3564                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3565         else
3566                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3567
3568         if (ra)
3569                 nfsd_put_raparams(file, ra);
3570
3571         if (nfserr)
3572                 xdr_truncate_encode(xdr, starting_len);
3573
3574         return nfserr;
3575 }
3576
3577 static __be32
3578 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3579 {
3580         int maxcount;
3581         __be32 wire_count;
3582         int zero = 0;
3583         struct xdr_stream *xdr = &resp->xdr;
3584         int length_offset = xdr->buf->len;
3585         __be32 *p;
3586
3587         p = xdr_reserve_space(xdr, 4);
3588         if (!p)
3589                 return nfserr_resource;
3590         maxcount = PAGE_SIZE;
3591
3592         p = xdr_reserve_space(xdr, maxcount);
3593         if (!p)
3594                 return nfserr_resource;
3595         /*
3596          * XXX: By default, vfs_readlink() will truncate symlinks if they
3597          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
3598          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3599          * that truncation occurred, and return NFS4ERR_RESOURCE.
3600          */
3601         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3602                                                 (char *)p, &maxcount);
3603         if (nfserr == nfserr_isdir)
3604                 nfserr = nfserr_inval;
3605         if (nfserr) {
3606                 xdr_truncate_encode(xdr, length_offset);
3607                 return nfserr;
3608         }
3609
3610         wire_count = htonl(maxcount);
3611         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3612         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3613         if (maxcount & 3)
3614                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3615                                                 &zero, 4 - (maxcount&3));
3616         return 0;
3617 }
3618
3619 static __be32
3620 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3621 {
3622         int maxcount;
3623         int bytes_left;
3624         loff_t offset;
3625         __be64 wire_offset;
3626         struct xdr_stream *xdr = &resp->xdr;
3627         int starting_len = xdr->buf->len;
3628         __be32 *p;
3629
3630         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3631         if (!p)
3632                 return nfserr_resource;
3633
3634         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3635         *p++ = cpu_to_be32(0);
3636         *p++ = cpu_to_be32(0);
3637         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3638                                 - (char *)resp->xdr.buf->head[0].iov_base;
3639
3640         /*
3641          * Number of bytes left for directory entries allowing for the
3642          * final 8 bytes of the readdir and a following failed op:
3643          */
3644         bytes_left = xdr->buf->buflen - xdr->buf->len
3645                         - COMPOUND_ERR_SLACK_SPACE - 8;
3646         if (bytes_left < 0) {
3647                 nfserr = nfserr_resource;
3648                 goto err_no_verf;
3649         }
3650         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3651         /*
3652          * Note the rfc defines rd_maxcount as the size of the
3653          * READDIR4resok structure, which includes the verifier above
3654          * and the 8 bytes encoded at the end of this function:
3655          */
3656         if (maxcount < 16) {
3657                 nfserr = nfserr_toosmall;
3658                 goto err_no_verf;
3659         }
3660         maxcount = min_t(int, maxcount-16, bytes_left);
3661
3662         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3663         if (!readdir->rd_dircount)
3664                 readdir->rd_dircount = INT_MAX;
3665
3666         readdir->xdr = xdr;
3667         readdir->rd_maxcount = maxcount;
3668         readdir->common.err = 0;
3669         readdir->cookie_offset = 0;
3670
3671         offset = readdir->rd_cookie;
3672         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3673                               &offset,
3674                               &readdir->common, nfsd4_encode_dirent);
3675         if (nfserr == nfs_ok &&
3676             readdir->common.err == nfserr_toosmall &&
3677             xdr->buf->len == starting_len + 8) {
3678                 /* nothing encoded; which limit did we hit?: */
3679                 if (maxcount - 16 < bytes_left)
3680                         /* It was the fault of rd_maxcount: */
3681                         nfserr = nfserr_toosmall;
3682                 else
3683                         /* We ran out of buffer space: */
3684                         nfserr = nfserr_resource;
3685         }
3686         if (nfserr)
3687                 goto err_no_verf;
3688
3689         if (readdir->cookie_offset) {
3690                 wire_offset = cpu_to_be64(offset);
3691                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3692                                                         &wire_offset, 8);
3693         }
3694
3695         p = xdr_reserve_space(xdr, 8);
3696         if (!p) {
3697                 WARN_ON_ONCE(1);
3698                 goto err_no_verf;
3699         }
3700         *p++ = 0;       /* no more entries */
3701         *p++ = htonl(readdir->common.err == nfserr_eof);
3702
3703         return 0;
3704 err_no_verf:
3705         xdr_truncate_encode(xdr, starting_len);
3706         return nfserr;
3707 }
3708
3709 static __be32
3710 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3711 {
3712         struct xdr_stream *xdr = &resp->xdr;
3713         __be32 *p;
3714
3715         p = xdr_reserve_space(xdr, 20);
3716         if (!p)
3717                 return nfserr_resource;
3718         p = encode_cinfo(p, &remove->rm_cinfo);
3719         return 0;
3720 }
3721
3722 static __be32
3723 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3724 {
3725         struct xdr_stream *xdr = &resp->xdr;
3726         __be32 *p;
3727
3728         p = xdr_reserve_space(xdr, 40);
3729         if (!p)
3730                 return nfserr_resource;
3731         p = encode_cinfo(p, &rename->rn_sinfo);
3732         p = encode_cinfo(p, &rename->rn_tinfo);
3733         return 0;
3734 }
3735
3736 static __be32
3737 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
3738 {
3739         u32 i, nflavs, supported;
3740         struct exp_flavor_info *flavs;
3741         struct exp_flavor_info def_flavs[2];
3742         __be32 *p, *flavorsp;
3743         static bool report = true;
3744
3745         if (exp->ex_nflavors) {
3746                 flavs = exp->ex_flavors;
3747                 nflavs = exp->ex_nflavors;
3748         } else { /* Handling of some defaults in absence of real secinfo: */
3749                 flavs = def_flavs;
3750                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3751                         nflavs = 2;
3752                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3753                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3754                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3755                         nflavs = 1;
3756                         flavs[0].pseudoflavor
3757                                         = svcauth_gss_flavor(exp->ex_client);
3758                 } else {
3759                         nflavs = 1;
3760                         flavs[0].pseudoflavor
3761                                         = exp->ex_client->flavour->flavour;
3762                 }
3763         }
3764
3765         supported = 0;
3766         p = xdr_reserve_space(xdr, 4);
3767         if (!p)
3768                 return nfserr_resource;
3769         flavorsp = p++;         /* to be backfilled later */
3770
3771         for (i = 0; i < nflavs; i++) {
3772                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3773                 struct rpcsec_gss_info info;
3774
3775                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3776                         supported++;
3777                         p = xdr_reserve_space(xdr, 4 + 4 +
3778                                               XDR_LEN(info.oid.len) + 4 + 4);
3779                         if (!p)
3780                                 return nfserr_resource;
3781                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3782                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3783                         *p++ = cpu_to_be32(info.qop);
3784                         *p++ = cpu_to_be32(info.service);
3785                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3786                         supported++;
3787                         p = xdr_reserve_space(xdr, 4);
3788                         if (!p)
3789                                 return nfserr_resource;
3790                         *p++ = cpu_to_be32(pf);
3791                 } else {
3792                         if (report)
3793                                 pr_warn("NFS: SECINFO: security flavor %u "
3794                                         "is not supported\n", pf);
3795                 }
3796         }
3797
3798         if (nflavs != supported)
3799                 report = false;
3800         *flavorsp = htonl(supported);
3801         return 0;
3802 }
3803
3804 static __be32
3805 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3806                      struct nfsd4_secinfo *secinfo)
3807 {
3808         struct xdr_stream *xdr = &resp->xdr;
3809
3810         return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
3811 }
3812
3813 static __be32
3814 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3815                      struct nfsd4_secinfo_no_name *secinfo)
3816 {
3817         struct xdr_stream *xdr = &resp->xdr;
3818
3819         return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
3820 }
3821
3822 /*
3823  * The SETATTR encode routine is special -- it always encodes a bitmap,
3824  * regardless of the error status.
3825  */
3826 static __be32
3827 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3828 {
3829         struct xdr_stream *xdr = &resp->xdr;
3830         __be32 *p;
3831
3832         p = xdr_reserve_space(xdr, 16);
3833         if (!p)
3834                 return nfserr_resource;
3835         if (nfserr) {
3836                 *p++ = cpu_to_be32(3);
3837                 *p++ = cpu_to_be32(0);
3838                 *p++ = cpu_to_be32(0);
3839                 *p++ = cpu_to_be32(0);
3840         }
3841         else {
3842                 *p++ = cpu_to_be32(3);
3843                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3844                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3845                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3846         }
3847         return nfserr;
3848 }
3849
3850 static __be32
3851 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3852 {
3853         struct xdr_stream *xdr = &resp->xdr;
3854         __be32 *p;
3855
3856         if (!nfserr) {
3857                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3858                 if (!p)
3859                         return nfserr_resource;
3860                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3861                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3862                                                 NFS4_VERIFIER_SIZE);
3863         }
3864         else if (nfserr == nfserr_clid_inuse) {
3865                 p = xdr_reserve_space(xdr, 8);
3866                 if (!p)
3867                         return nfserr_resource;
3868                 *p++ = cpu_to_be32(0);
3869                 *p++ = cpu_to_be32(0);
3870         }
3871         return nfserr;
3872 }
3873
3874 static __be32
3875 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3876 {
3877         struct xdr_stream *xdr = &resp->xdr;
3878         __be32 *p;
3879
3880         p = xdr_reserve_space(xdr, 16);
3881         if (!p)
3882                 return nfserr_resource;
3883         *p++ = cpu_to_be32(write->wr_bytes_written);
3884         *p++ = cpu_to_be32(write->wr_how_written);
3885         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3886                                                 NFS4_VERIFIER_SIZE);
3887         return 0;
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         uint64_t minor_id = 0;
3901
3902         major_id = utsname()->nodename;
3903         major_id_sz = strlen(major_id);
3904         server_scope = utsname()->nodename;
3905         server_scope_sz = strlen(server_scope);
3906
3907         p = xdr_reserve_space(xdr,
3908                 8 /* eir_clientid */ +
3909                 4 /* eir_sequenceid */ +
3910                 4 /* eir_flags */ +
3911                 4 /* spr_how */);
3912         if (!p)
3913                 return nfserr_resource;
3914
3915         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3916         *p++ = cpu_to_be32(exid->seqid);
3917         *p++ = cpu_to_be32(exid->flags);
3918
3919         *p++ = cpu_to_be32(exid->spa_how);
3920
3921         switch (exid->spa_how) {
3922         case SP4_NONE:
3923                 break;
3924         case SP4_MACH_CRED:
3925                 /* spo_must_enforce bitmap: */
3926                 nfserr = nfsd4_encode_bitmap(xdr,
3927                                         exid->spo_must_enforce[0],
3928                                         exid->spo_must_enforce[1],
3929                                         exid->spo_must_enforce[2]);
3930                 if (nfserr)
3931                         return nfserr;
3932                 /* spo_must_allow bitmap: */
3933                 nfserr = nfsd4_encode_bitmap(xdr,
3934                                         exid->spo_must_allow[0],
3935                                         exid->spo_must_allow[1],
3936                                         exid->spo_must_allow[2]);
3937                 if (nfserr)
3938                         return nfserr;
3939                 break;
3940         default:
3941                 WARN_ON_ONCE(1);
3942         }
3943
3944         p = xdr_reserve_space(xdr,
3945                 8 /* so_minor_id */ +
3946                 4 /* so_major_id.len */ +
3947                 (XDR_QUADLEN(major_id_sz) * 4) +
3948                 4 /* eir_server_scope.len */ +
3949                 (XDR_QUADLEN(server_scope_sz) * 4) +
3950                 4 /* eir_server_impl_id.count (0) */);
3951         if (!p)
3952                 return nfserr_resource;
3953
3954         /* The server_owner struct */
3955         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3956         /* major id */
3957         p = xdr_encode_opaque(p, major_id, major_id_sz);
3958
3959         /* Server scope */
3960         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3961
3962         /* Implementation id */
3963         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3964         return 0;
3965 }
3966
3967 static __be32
3968 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3969                             struct nfsd4_create_session *sess)
3970 {
3971         struct xdr_stream *xdr = &resp->xdr;
3972         __be32 *p;
3973
3974         p = xdr_reserve_space(xdr, 24);
3975         if (!p)
3976                 return nfserr_resource;
3977         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3978                                         NFS4_MAX_SESSIONID_LEN);
3979         *p++ = cpu_to_be32(sess->seqid);
3980         *p++ = cpu_to_be32(sess->flags);
3981
3982         p = xdr_reserve_space(xdr, 28);
3983         if (!p)
3984                 return nfserr_resource;
3985         *p++ = cpu_to_be32(0); /* headerpadsz */
3986         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3987         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3988         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3989         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3990         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3991         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3992
3993         if (sess->fore_channel.nr_rdma_attrs) {
3994                 p = xdr_reserve_space(xdr, 4);
3995                 if (!p)
3996                         return nfserr_resource;
3997                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3998         }
3999
4000         p = xdr_reserve_space(xdr, 28);
4001         if (!p)
4002                 return nfserr_resource;
4003         *p++ = cpu_to_be32(0); /* headerpadsz */
4004         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4005         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4006         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4007         *p++ = cpu_to_be32(sess->back_channel.maxops);
4008         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4009         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4010
4011         if (sess->back_channel.nr_rdma_attrs) {
4012                 p = xdr_reserve_space(xdr, 4);
4013                 if (!p)
4014                         return nfserr_resource;
4015                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4016         }
4017         return 0;
4018 }
4019
4020 static __be32
4021 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4022                       struct nfsd4_sequence *seq)
4023 {
4024         struct xdr_stream *xdr = &resp->xdr;
4025         __be32 *p;
4026
4027         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4028         if (!p)
4029                 return nfserr_resource;
4030         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4031                                         NFS4_MAX_SESSIONID_LEN);
4032         *p++ = cpu_to_be32(seq->seqid);
4033         *p++ = cpu_to_be32(seq->slotid);
4034         /* Note slotid's are numbered from zero: */
4035         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4036         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4037         *p++ = cpu_to_be32(seq->status_flags);
4038
4039         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4040         return 0;
4041 }
4042
4043 static __be32
4044 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4045                           struct nfsd4_test_stateid *test_stateid)
4046 {
4047         struct xdr_stream *xdr = &resp->xdr;
4048         struct nfsd4_test_stateid_id *stateid, *next;
4049         __be32 *p;
4050
4051         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4052         if (!p)
4053                 return nfserr_resource;
4054         *p++ = htonl(test_stateid->ts_num_ids);
4055
4056         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4057                 *p++ = stateid->ts_id_status;
4058         }
4059
4060         return 0;
4061 }
4062
4063 #ifdef CONFIG_NFSD_PNFS
4064 static __be32
4065 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4066                 struct nfsd4_getdeviceinfo *gdev)
4067 {
4068         struct xdr_stream *xdr = &resp->xdr;
4069         const struct nfsd4_layout_ops *ops;
4070         u32 starting_len = xdr->buf->len, needed_len;
4071         __be32 *p;
4072
4073         p = xdr_reserve_space(xdr, 4);
4074         if (!p)
4075                 return nfserr_resource;
4076
4077         *p++ = cpu_to_be32(gdev->gd_layout_type);
4078
4079         /* If maxcount is 0 then just update notifications */
4080         if (gdev->gd_maxcount != 0) {
4081                 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4082                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4083                 if (nfserr) {
4084                         /*
4085                          * We don't bother to burden the layout drivers with
4086                          * enforcing gd_maxcount, just tell the client to
4087                          * come back with a bigger buffer if it's not enough.
4088                          */
4089                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4090                                 goto toosmall;
4091                         return nfserr;
4092                 }
4093         }
4094
4095         if (gdev->gd_notify_types) {
4096                 p = xdr_reserve_space(xdr, 4 + 4);
4097                 if (!p)
4098                         return nfserr_resource;
4099                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4100                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4101         } else {
4102                 p = xdr_reserve_space(xdr, 4);
4103                 if (!p)
4104                         return nfserr_resource;
4105                 *p++ = 0;
4106         }
4107
4108         return 0;
4109 toosmall:
4110         dprintk("%s: maxcount too small\n", __func__);
4111         needed_len = xdr->buf->len + 4 /* notifications */;
4112         xdr_truncate_encode(xdr, starting_len);
4113         p = xdr_reserve_space(xdr, 4);
4114         if (!p)
4115                 return nfserr_resource;
4116         *p++ = cpu_to_be32(needed_len);
4117         return nfserr_toosmall;
4118 }
4119
4120 static __be32
4121 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4122                 struct nfsd4_layoutget *lgp)
4123 {
4124         struct xdr_stream *xdr = &resp->xdr;
4125         const struct nfsd4_layout_ops *ops;
4126         __be32 *p;
4127
4128         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4129         if (!p)
4130                 return nfserr_resource;
4131
4132         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4133         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4134         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4135                                     sizeof(stateid_opaque_t));
4136
4137         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4138         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4139         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4140         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4141         *p++ = cpu_to_be32(lgp->lg_layout_type);
4142
4143         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4144         return ops->encode_layoutget(xdr, lgp);
4145 }
4146
4147 static __be32
4148 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4149                           struct nfsd4_layoutcommit *lcp)
4150 {
4151         struct xdr_stream *xdr = &resp->xdr;
4152         __be32 *p;
4153
4154         p = xdr_reserve_space(xdr, 4);
4155         if (!p)
4156                 return nfserr_resource;
4157         *p++ = cpu_to_be32(lcp->lc_size_chg);
4158         if (lcp->lc_size_chg) {
4159                 p = xdr_reserve_space(xdr, 8);
4160                 if (!p)
4161                         return nfserr_resource;
4162                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4163         }
4164
4165         return 0;
4166 }
4167
4168 static __be32
4169 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4170                 struct nfsd4_layoutreturn *lrp)
4171 {
4172         struct xdr_stream *xdr = &resp->xdr;
4173         __be32 *p;
4174
4175         p = xdr_reserve_space(xdr, 4);
4176         if (!p)
4177                 return nfserr_resource;
4178         *p++ = cpu_to_be32(lrp->lrs_present);
4179         if (lrp->lrs_present)
4180                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4181         return 0;
4182 }
4183 #endif /* CONFIG_NFSD_PNFS */
4184
4185 static __be32
4186 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4187 {
4188         __be32 *p;
4189
4190         p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4191         if (!p)
4192                 return nfserr_resource;
4193
4194         *p++ = cpu_to_be32(0);
4195         p = xdr_encode_hyper(p, write->wr_bytes_written);
4196         *p++ = cpu_to_be32(write->wr_stable_how);
4197         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4198                                     NFS4_VERIFIER_SIZE);
4199         return nfs_ok;
4200 }
4201
4202 static __be32
4203 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4204                   struct nfsd4_copy *copy)
4205 {
4206         __be32 *p;
4207
4208         nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
4209         if (nfserr)
4210                 return nfserr;
4211
4212         p = xdr_reserve_space(&resp->xdr, 4 + 4);
4213         *p++ = cpu_to_be32(copy->cp_consecutive);
4214         *p++ = cpu_to_be32(copy->cp_synchronous);
4215         return 0;
4216 }
4217
4218 static __be32
4219 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4220                   struct nfsd4_seek *seek)
4221 {
4222         __be32 *p;
4223
4224         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4225         *p++ = cpu_to_be32(seek->seek_eof);
4226         p = xdr_encode_hyper(p, seek->seek_pos);
4227
4228         return 0;
4229 }
4230
4231 static __be32
4232 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4233 {
4234         return nfserr;
4235 }
4236
4237 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4238
4239 /*
4240  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4241  * since we don't need to filter out obsolete ops as this is
4242  * done in the decoding phase.
4243  */
4244 static const nfsd4_enc nfsd4_enc_ops[] = {
4245         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4246         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4247         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4248         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4249         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4250         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4251         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4252         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4253         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4254         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4255         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4256         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4257         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4258         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4259         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4260         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4261         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4262         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4263         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4264         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4265         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4266         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4267         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4268         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4269         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4270         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4271         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4272         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4273         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4274         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4275         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4276         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4277         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4278         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4279         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4280         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4281         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4282
4283         /* NFSv4.1 operations */
4284         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4285         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4286         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4287         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4288         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4289         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4290         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4291 #ifdef CONFIG_NFSD_PNFS
4292         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4293         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4294         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4295         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4296         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4297 #else
4298         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4299         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4300         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4301         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4302         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4303 #endif
4304         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4305         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4306         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4307         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4308         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4309         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4310         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4311
4312         /* NFSv4.2 operations */
4313         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4314         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
4315         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4316         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4317         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4318         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4319         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4320         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4321         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4322         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4323         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4324         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4325         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4326 };
4327
4328 /*
4329  * Calculate whether we still have space to encode repsize bytes.
4330  * There are two considerations:
4331  *     - For NFS versions >=4.1, the size of the reply must stay within
4332  *       session limits
4333  *     - For all NFS versions, we must stay within limited preallocated
4334  *       buffer space.
4335  *
4336  * This is called before the operation is processed, so can only provide
4337  * an upper estimate.  For some nonidempotent operations (such as
4338  * getattr), it's not necessarily a problem if that estimate is wrong,
4339  * as we can fail it after processing without significant side effects.
4340  */
4341 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4342 {
4343         struct xdr_buf *buf = &resp->rqstp->rq_res;
4344         struct nfsd4_slot *slot = resp->cstate.slot;
4345
4346         if (buf->len + respsize <= buf->buflen)
4347                 return nfs_ok;
4348         if (!nfsd4_has_session(&resp->cstate))
4349                 return nfserr_resource;
4350         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4351                 WARN_ON_ONCE(1);
4352                 return nfserr_rep_too_big_to_cache;
4353         }
4354         return nfserr_rep_too_big;
4355 }
4356
4357 void
4358 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4359 {
4360         struct xdr_stream *xdr = &resp->xdr;
4361         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4362         struct svc_rqst *rqstp = resp->rqstp;
4363         const struct nfsd4_operation *opdesc = op->opdesc;
4364         int post_err_offset;
4365         nfsd4_enc encoder;
4366         __be32 *p;
4367
4368         p = xdr_reserve_space(xdr, 8);
4369         if (!p) {
4370                 WARN_ON_ONCE(1);
4371                 return;
4372         }
4373         *p++ = cpu_to_be32(op->opnum);
4374         post_err_offset = xdr->buf->len;
4375
4376         if (op->opnum == OP_ILLEGAL)
4377                 goto status;
4378         if (op->status && opdesc &&
4379                         !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
4380                 goto status;
4381         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4382                !nfsd4_enc_ops[op->opnum]);
4383         encoder = nfsd4_enc_ops[op->opnum];
4384         op->status = encoder(resp, op->status, &op->u);
4385         if (opdesc && opdesc->op_release)
4386                 opdesc->op_release(&op->u);
4387         xdr_commit_encode(xdr);
4388
4389         /* nfsd4_check_resp_size guarantees enough room for error status */
4390         if (!op->status) {
4391                 int space_needed = 0;
4392                 if (!nfsd4_last_compound_op(rqstp))
4393                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4394                 op->status = nfsd4_check_resp_size(resp, space_needed);
4395         }
4396         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4397                 struct nfsd4_slot *slot = resp->cstate.slot;
4398
4399                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4400                         op->status = nfserr_rep_too_big_to_cache;
4401                 else
4402                         op->status = nfserr_rep_too_big;
4403         }
4404         if (op->status == nfserr_resource ||
4405             op->status == nfserr_rep_too_big ||
4406             op->status == nfserr_rep_too_big_to_cache) {
4407                 /*
4408                  * The operation may have already been encoded or
4409                  * partially encoded.  No op returns anything additional
4410                  * in the case of one of these three errors, so we can
4411                  * just truncate back to after the status.  But it's a
4412                  * bug if we had to do this on a non-idempotent op:
4413                  */
4414                 warn_on_nonidempotent_op(op);
4415                 xdr_truncate_encode(xdr, post_err_offset);
4416         }
4417         if (so) {
4418                 int len = xdr->buf->len - post_err_offset;
4419
4420                 so->so_replay.rp_status = op->status;
4421                 so->so_replay.rp_buflen = len;
4422                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4423                                                 so->so_replay.rp_buf, len);
4424         }
4425 status:
4426         /* Note that op->status is already in network byte order: */
4427         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4428 }
4429
4430 /*
4431  * Encode the reply stored in the stateowner reply cache
4432  *
4433  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4434  * previously sent already encoded operation.
4435  */
4436 void
4437 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4438 {
4439         __be32 *p;
4440         struct nfs4_replay *rp = op->replay;
4441
4442         BUG_ON(!rp);
4443
4444         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4445         if (!p) {
4446                 WARN_ON_ONCE(1);
4447                 return;
4448         }
4449         *p++ = cpu_to_be32(op->opnum);
4450         *p++ = rp->rp_status;  /* already xdr'ed */
4451
4452         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4453 }
4454
4455 int
4456 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4457 {
4458         return xdr_ressize_check(rqstp, p);
4459 }
4460
4461 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4462 {
4463         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4464
4465         if (args->ops != args->iops) {
4466                 kfree(args->ops);
4467                 args->ops = args->iops;
4468         }
4469         kfree(args->tmpp);
4470         args->tmpp = NULL;
4471         while (args->to_free) {
4472                 struct svcxdr_tmpbuf *tb = args->to_free;
4473                 args->to_free = tb->next;
4474                 kfree(tb);
4475         }
4476 }
4477
4478 int
4479 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4480 {
4481         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4482
4483         if (rqstp->rq_arg.head[0].iov_len % 4) {
4484                 /* client is nuts */
4485                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4486                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4487                 return 0;
4488         }
4489         args->p = p;
4490         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4491         args->pagelist = rqstp->rq_arg.pages;
4492         args->pagelen = rqstp->rq_arg.page_len;
4493         args->tail = false;
4494         args->tmpp = NULL;
4495         args->to_free = NULL;
4496         args->ops = args->iops;
4497         args->rqstp = rqstp;
4498
4499         return !nfsd4_decode_compound(args);
4500 }
4501
4502 int
4503 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4504 {
4505         /*
4506          * All that remains is to write the tag and operation count...
4507          */
4508         struct nfsd4_compoundres *resp = rqstp->rq_resp;
4509         struct xdr_buf *buf = resp->xdr.buf;
4510
4511         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4512                                  buf->tail[0].iov_len);
4513
4514         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4515
4516         p = resp->tagp;
4517         *p++ = htonl(resp->taglen);
4518         memcpy(p, resp->tag, resp->taglen);
4519         p += XDR_QUADLEN(resp->taglen);
4520         *p++ = htonl(resp->opcnt);
4521
4522         nfsd4_sequence_done(resp);
4523         return 1;
4524 }
4525
4526 /*
4527  * Local variables:
4528  *  c-basic-offset: 8
4529  * End:
4530  */