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/slab.h>
  37 #include <linux/namei.h>
  38 #include <linux/statfs.h>
  39 #include <linux/utsname.h>
  40 #include <linux/pagemap.h>
  41 #include <linux/sunrpc/svcauth_gss.h>
  42
  43 #include "idmap.h"
  44 #include "acl.h"
  45 #include "xdr4.h"
  46 #include "vfs.h"
  47 #include "state.h"
  48 #include "cache.h"
  49 #include "netns.h"
  50
  51 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  52 #include <linux/security.h>
  53 #endif
  54
  55
  56 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  57
  58 /*
  59  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  60  * directory in order to indicate to the client that a filesystem boundary is present
  61  * We use a fixed fsid for a referral
  62  */
  63 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  64 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  65
  66 static __be32
  67 check_filename(char *str, int len)
  68 {
  69         int i;
  70
  71         if (len == 0)
  72                 return nfserr_inval;
  73         if (isdotent(str, len))
  74                 return nfserr_badname;
  75         for (i = 0; i < len; i++)
  76                 if (str[i] == '/')
  77                         return nfserr_badname;
  78         return 0;
  79 }
  80
  81 #define DECODE_HEAD                             \
  82         __be32 *p;                              \
  83         __be32 status
  84 #define DECODE_TAIL                             \
  85         status = 0;                             \
  86 out:                                            \
  87         return status;                          \
  88 xdr_error:                                      \
  89         dprintk("NFSD: xdr error (%s:%d)\n",    \
  90                         __FILE__, __LINE__);    \
  91         status = nfserr_bad_xdr;                \
  92         goto out
  93
  94 #define READMEM(x,nbytes) do {                  \
  95         x = (char *)p;                          \
  96         p += XDR_QUADLEN(nbytes);               \
  97 } while (0)
  98 #define SAVEMEM(x,nbytes) do {                  \
  99         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 100                 savemem(argp, p, nbytes) :      \
 101                 (char *)p)) {                   \
 102                 dprintk("NFSD: xdr error (%s:%d)\n", \
 103                                 __FILE__, __LINE__); \
 104                 goto xdr_error;                 \
 105                 }                               \
 106         p += XDR_QUADLEN(nbytes);               \
 107 } while (0)
 108 #define COPYMEM(x,nbytes) do {                  \
 109         memcpy((x), p, nbytes);                 \
 110         p += XDR_QUADLEN(nbytes);               \
 111 } while (0)
 112
 113 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 114 #define READ_BUF(nbytes)  do {                  \
 115         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 116                 p = argp->p;                    \
 117                 argp->p += XDR_QUADLEN(nbytes); \
 118         } else if (!(p = read_buf(argp, nbytes))) { \
 119                 dprintk("NFSD: xdr error (%s:%d)\n", \
 120                                 __FILE__, __LINE__); \
 121                 goto xdr_error;                 \
 122         }                                       \
 123 } while (0)
 124
 125 static void next_decode_page(struct nfsd4_compoundargs *argp)
 126 {
 127         argp->p = page_address(argp->pagelist[0]);
 128         argp->pagelist++;
 129         if (argp->pagelen < PAGE_SIZE) {
 130                 argp->end = argp->p + (argp->pagelen>>2);
 131                 argp->pagelen = 0;
 132         } else {
 133                 argp->end = argp->p + (PAGE_SIZE>>2);
 134                 argp->pagelen -= PAGE_SIZE;
 135         }
 136 }
 137
 138 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 139 {
 140         /* We want more bytes than seem to be available.
 141          * Maybe we need a new page, maybe we have just run out
 142          */
 143         unsigned int avail = (char *)argp->end - (char *)argp->p;
 144         __be32 *p;
 145         if (avail + argp->pagelen < nbytes)
 146                 return NULL;
 147         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 148                 return NULL;
 149         /* ok, we can do it with the current plus the next page */
 150         if (nbytes <= sizeof(argp->tmp))
 151                 p = argp->tmp;
 152         else {
 153                 kfree(argp->tmpp);
 154                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 155                 if (!p)
 156                         return NULL;
 157
 158         }
 159         /*
 160          * The following memcpy is safe because read_buf is always
 161          * called with nbytes > avail, and the two cases above both
 162          * guarantee p points to at least nbytes bytes.
 163          */
 164         memcpy(p, argp->p, avail);
 165         next_decode_page(argp);
 166         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 167         argp->p += XDR_QUADLEN(nbytes - avail);
 168         return p;
 169 }
 170
 171 static int zero_clientid(clientid_t *clid)
 172 {
 173         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 174 }
 175
 176 /**
 177  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 178  * @argp: NFSv4 compound argument structure
 179  * @p: pointer to be freed (with kfree())
 180  *
 181  * Marks @p to be freed when processing the compound operation
 182  * described in @argp finishes.
 183  */
 184 static void *
 185 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 186 {
 187         struct svcxdr_tmpbuf *tb;
 188
 189         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 190         if (!tb)
 191                 return NULL;
 192         tb->next = argp->to_free;
 193         argp->to_free = tb;
 194         return tb->buf;
 195 }
 196
 197 /*
 198  * For xdr strings that need to be passed to other kernel api's
 199  * as null-terminated strings.
 200  *
 201  * Note null-terminating in place usually isn't safe since the
 202  * buffer might end on a page boundary.
 203  */
 204 static char *
 205 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 206 {
 207         char *p = svcxdr_tmpalloc(argp, len + 1);
 208
 209         if (!p)
 210                 return NULL;
 211         memcpy(p, buf, len);
 212         p[len] = '\0';
 213         return p;
 214 }
 215
 216 /**
 217  * savemem - duplicate a chunk of memory for later processing
 218  * @argp: NFSv4 compound argument structure to be freed with
 219  * @p: pointer to be duplicated
 220  * @nbytes: length to be duplicated
 221  *
 222  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 223  * that are preserved until processing of the NFSv4 compound
 224  * operation described by @argp finishes.
 225  */
 226 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 227 {
 228         void *ret;
 229
 230         ret = svcxdr_tmpalloc(argp, nbytes);
 231         if (!ret)
 232                 return NULL;
 233         memcpy(ret, p, nbytes);
 234         return ret;
 235 }
 236
 237 static __be32
 238 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 239 {
 240         u32 bmlen;
 241         DECODE_HEAD;
 242
 243         bmval[0] = 0;
 244         bmval[1] = 0;
 245         bmval[2] = 0;
 246
 247         READ_BUF(4);
 248         bmlen = be32_to_cpup(p++);
 249         if (bmlen > 1000)
 250                 goto xdr_error;
 251
 252         READ_BUF(bmlen << 2);
 253         if (bmlen > 0)
 254                 bmval[0] = be32_to_cpup(p++);
 255         if (bmlen > 1)
 256                 bmval[1] = be32_to_cpup(p++);
 257         if (bmlen > 2)
 258                 bmval[2] = be32_to_cpup(p++);
 259
 260         DECODE_TAIL;
 261 }
 262
 263 static __be32
 264 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 265                    struct iattr *iattr, struct nfs4_acl **acl,
 266                    struct xdr_netobj *label)
 267 {
 268         int expected_len, len = 0;
 269         u32 dummy32;
 270         u64 sec;
 271         char *buf;
 272
 273         DECODE_HEAD;
 274         iattr->ia_valid = 0;
 275         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 276                 return status;
 277
 278         READ_BUF(4);
 279         expected_len = be32_to_cpup(p++);
 280
 281         if (bmval[0] & FATTR4_WORD0_SIZE) {
 282                 READ_BUF(8);
 283                 len += 8;
 284                 p = xdr_decode_hyper(p, &iattr->ia_size);
 285                 iattr->ia_valid |= ATTR_SIZE;
 286         }
 287         if (bmval[0] & FATTR4_WORD0_ACL) {
 288                 u32 nace;
 289                 struct nfs4_ace *ace;
 290
 291                 READ_BUF(4); len += 4;
 292                 nace = be32_to_cpup(p++);
 293
 294                 if (nace > NFS4_ACL_MAX)
 295                         return nfserr_fbig;
 296
 297                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
 298                 if (*acl == NULL)
 299                         return nfserr_jukebox;
 300
 301                 (*acl)->naces = nace;
 302                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 303                         READ_BUF(16); len += 16;
 304                         ace->type = be32_to_cpup(p++);
 305                         ace->flag = be32_to_cpup(p++);
 306                         ace->access_mask = be32_to_cpup(p++);
 307                         dummy32 = be32_to_cpup(p++);
 308                         READ_BUF(dummy32);
 309                         len += XDR_QUADLEN(dummy32) << 2;
 310                         READMEM(buf, dummy32);
 311                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 312                         status = nfs_ok;
 313                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 314                                 ;
 315                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 316                                 status = nfsd_map_name_to_gid(argp->rqstp,
 317                                                 buf, dummy32, &ace->who_gid);
 318                         else
 319                                 status = nfsd_map_name_to_uid(argp->rqstp,
 320                                                 buf, dummy32, &ace->who_uid);
 321                         if (status)
 322                                 return status;
 323                 }
 324         } else
 325                 *acl = NULL;
 326         if (bmval[1] & FATTR4_WORD1_MODE) {
 327                 READ_BUF(4);
 328                 len += 4;
 329                 iattr->ia_mode = be32_to_cpup(p++);
 330                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 331                 iattr->ia_valid |= ATTR_MODE;
 332         }
 333         if (bmval[1] & FATTR4_WORD1_OWNER) {
 334                 READ_BUF(4);
 335                 len += 4;
 336                 dummy32 = be32_to_cpup(p++);
 337                 READ_BUF(dummy32);
 338                 len += (XDR_QUADLEN(dummy32) << 2);
 339                 READMEM(buf, dummy32);
 340                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 341                         return status;
 342                 iattr->ia_valid |= ATTR_UID;
 343         }
 344         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 345                 READ_BUF(4);
 346                 len += 4;
 347                 dummy32 = be32_to_cpup(p++);
 348                 READ_BUF(dummy32);
 349                 len += (XDR_QUADLEN(dummy32) << 2);
 350                 READMEM(buf, dummy32);
 351                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 352                         return status;
 353                 iattr->ia_valid |= ATTR_GID;
 354         }
 355         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 356                 READ_BUF(4);
 357                 len += 4;
 358                 dummy32 = be32_to_cpup(p++);
 359                 switch (dummy32) {
 360                 case NFS4_SET_TO_CLIENT_TIME:
 361                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 362                            all 32 bits of 'nseconds'. */
 363                         READ_BUF(12);
 364                         len += 12;
 365                         p = xdr_decode_hyper(p, &sec);
 366                         iattr->ia_atime.tv_sec = (time_t)sec;
 367                         iattr->ia_atime.tv_nsec = be32_to_cpup(p++);
 368                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 369                                 return nfserr_inval;
 370                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 371                         break;
 372                 case NFS4_SET_TO_SERVER_TIME:
 373                         iattr->ia_valid |= ATTR_ATIME;
 374                         break;
 375                 default:
 376                         goto xdr_error;
 377                 }
 378         }
 379         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 380                 READ_BUF(4);
 381                 len += 4;
 382                 dummy32 = be32_to_cpup(p++);
 383                 switch (dummy32) {
 384                 case NFS4_SET_TO_CLIENT_TIME:
 385                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 386                            all 32 bits of 'nseconds'. */
 387                         READ_BUF(12);
 388                         len += 12;
 389                         p = xdr_decode_hyper(p, &sec);
 390                         iattr->ia_mtime.tv_sec = sec;
 391                         iattr->ia_mtime.tv_nsec = be32_to_cpup(p++);
 392                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 393                                 return nfserr_inval;
 394                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 395                         break;
 396                 case NFS4_SET_TO_SERVER_TIME:
 397                         iattr->ia_valid |= ATTR_MTIME;
 398                         break;
 399                 default:
 400                         goto xdr_error;
 401                 }
 402         }
 403
 404         label->len = 0;
 405 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 406         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 407                 READ_BUF(4);
 408                 len += 4;
 409                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 410                 READ_BUF(4);
 411                 len += 4;
 412                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 413                 READ_BUF(4);
 414                 len += 4;
 415                 dummy32 = be32_to_cpup(p++);
 416                 READ_BUF(dummy32);
 417                 if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
 418                         return nfserr_badlabel;
 419                 len += (XDR_QUADLEN(dummy32) << 2);
 420                 READMEM(buf, dummy32);
 421                 label->len = dummy32;
 422                 label->data = svcxdr_dupstr(argp, buf, dummy32);
 423                 if (!label->data)
 424                         return nfserr_jukebox;
 425         }
 426 #endif
 427
 428         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 429             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 430             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 431                 READ_BUF(expected_len - len);
 432         else if (len != expected_len)
 433                 goto xdr_error;
 434
 435         DECODE_TAIL;
 436 }
 437
 438 static __be32
 439 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 440 {
 441         DECODE_HEAD;
 442
 443         READ_BUF(sizeof(stateid_t));
 444         sid->si_generation = be32_to_cpup(p++);
 445         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 446
 447         DECODE_TAIL;
 448 }
 449
 450 static __be32
 451 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 452 {
 453         DECODE_HEAD;
 454
 455         READ_BUF(4);
 456         access->ac_req_access = be32_to_cpup(p++);
 457
 458         DECODE_TAIL;
 459 }
 460
 461 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 462 {
 463         DECODE_HEAD;
 464         u32 dummy, uid, gid;
 465         char *machine_name;
 466         int i;
 467         int nr_secflavs;
 468
 469         /* callback_sec_params4 */
 470         READ_BUF(4);
 471         nr_secflavs = be32_to_cpup(p++);
 472         if (nr_secflavs)
 473                 cbs->flavor = (u32)(-1);
 474         else
 475                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 476                 cbs->flavor = 0;
 477         for (i = 0; i < nr_secflavs; ++i) {
 478                 READ_BUF(4);
 479                 dummy = be32_to_cpup(p++);
 480                 switch (dummy) {
 481                 case RPC_AUTH_NULL:
 482                         /* Nothing to read */
 483                         if (cbs->flavor == (u32)(-1))
 484                                 cbs->flavor = RPC_AUTH_NULL;
 485                         break;
 486                 case RPC_AUTH_UNIX:
 487                         READ_BUF(8);
 488                         /* stamp */
 489                         dummy = be32_to_cpup(p++);
 490
 491                         /* machine name */
 492                         dummy = be32_to_cpup(p++);
 493                         READ_BUF(dummy);
 494                         SAVEMEM(machine_name, dummy);
 495
 496                         /* uid, gid */
 497                         READ_BUF(8);
 498                         uid = be32_to_cpup(p++);
 499                         gid = be32_to_cpup(p++);
 500
 501                         /* more gids */
 502                         READ_BUF(4);
 503                         dummy = be32_to_cpup(p++);
 504                         READ_BUF(dummy * 4);
 505                         if (cbs->flavor == (u32)(-1)) {
 506                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 507                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 508                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 509                                         cbs->uid = kuid;
 510                                         cbs->gid = kgid;
 511                                         cbs->flavor = RPC_AUTH_UNIX;
 512                                 } else {
 513                                         dprintk("RPC_AUTH_UNIX with invalid"
 514                                                 "uid or gid ignoring!\n");
 515                                 }
 516                         }
 517                         break;
 518                 case RPC_AUTH_GSS:
 519                         dprintk("RPC_AUTH_GSS callback secflavor "
 520                                 "not supported!\n");
 521                         READ_BUF(8);
 522                         /* gcbp_service */
 523                         dummy = be32_to_cpup(p++);
 524                         /* gcbp_handle_from_server */
 525                         dummy = be32_to_cpup(p++);
 526                         READ_BUF(dummy);
 527                         p += XDR_QUADLEN(dummy);
 528                         /* gcbp_handle_from_client */
 529                         READ_BUF(4);
 530                         dummy = be32_to_cpup(p++);
 531                         READ_BUF(dummy);
 532                         break;
 533                 default:
 534                         dprintk("Illegal callback secflavor\n");
 535                         return nfserr_inval;
 536                 }
 537         }
 538         DECODE_TAIL;
 539 }
 540
 541 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 542 {
 543         DECODE_HEAD;
 544
 545         READ_BUF(4);
 546         bc->bc_cb_program = be32_to_cpup(p++);
 547         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 548
 549         DECODE_TAIL;
 550 }
 551
 552 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 553 {
 554         DECODE_HEAD;
 555
 556         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 557         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 558         bcts->dir = be32_to_cpup(p++);
 559         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 560          * could help us figure out we should be using it. */
 561         DECODE_TAIL;
 562 }
 563
 564 static __be32
 565 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 566 {
 567         DECODE_HEAD;
 568
 569         READ_BUF(4);
 570         close->cl_seqid = be32_to_cpup(p++);
 571         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 572
 573         DECODE_TAIL;
 574 }
 575
 576
 577 static __be32
 578 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 579 {
 580         DECODE_HEAD;
 581
 582         READ_BUF(12);
 583         p = xdr_decode_hyper(p, &commit->co_offset);
 584         commit->co_count = be32_to_cpup(p++);
 585
 586         DECODE_TAIL;
 587 }
 588
 589 static __be32
 590 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 591 {
 592         DECODE_HEAD;
 593
 594         READ_BUF(4);
 595         create->cr_type = be32_to_cpup(p++);
 596         switch (create->cr_type) {
 597         case NF4LNK:
 598                 READ_BUF(4);
 599                 create->cr_datalen = be32_to_cpup(p++);
 600                 READ_BUF(create->cr_datalen);
 601                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 602                 if (!create->cr_data)
 603                         return nfserr_jukebox;
 604                 break;
 605         case NF4BLK:
 606         case NF4CHR:
 607                 READ_BUF(8);
 608                 create->cr_specdata1 = be32_to_cpup(p++);
 609                 create->cr_specdata2 = be32_to_cpup(p++);
 610                 break;
 611         case NF4SOCK:
 612         case NF4FIFO:
 613         case NF4DIR:
 614         default:
 615                 break;
 616         }
 617
 618         READ_BUF(4);
 619         create->cr_namelen = be32_to_cpup(p++);
 620         READ_BUF(create->cr_namelen);
 621         SAVEMEM(create->cr_name, create->cr_namelen);
 622         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 623                 return status;
 624
 625         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 626                                     &create->cr_acl, &create->cr_label);
 627         if (status)
 628                 goto out;
 629
 630         DECODE_TAIL;
 631 }
 632
 633 static inline __be32
 634 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 635 {
 636         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 637 }
 638
 639 static inline __be32
 640 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 641 {
 642         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 643 }
 644
 645 static __be32
 646 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 647 {
 648         DECODE_HEAD;
 649
 650         READ_BUF(4);
 651         link->li_namelen = be32_to_cpup(p++);
 652         READ_BUF(link->li_namelen);
 653         SAVEMEM(link->li_name, link->li_namelen);
 654         if ((status = check_filename(link->li_name, link->li_namelen)))
 655                 return status;
 656
 657         DECODE_TAIL;
 658 }
 659
 660 static __be32
 661 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 662 {
 663         DECODE_HEAD;
 664
 665         /*
 666         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 667         */
 668         READ_BUF(28);
 669         lock->lk_type = be32_to_cpup(p++);
 670         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 671                 goto xdr_error;
 672         lock->lk_reclaim = be32_to_cpup(p++);
 673         p = xdr_decode_hyper(p, &lock->lk_offset);
 674         p = xdr_decode_hyper(p, &lock->lk_length);
 675         lock->lk_is_new = be32_to_cpup(p++);
 676
 677         if (lock->lk_is_new) {
 678                 READ_BUF(4);
 679                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 680                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 681                 if (status)
 682                         return status;
 683                 READ_BUF(8 + sizeof(clientid_t));
 684                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 685                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 686                 lock->lk_new_owner.len = be32_to_cpup(p++);
 687                 READ_BUF(lock->lk_new_owner.len);
 688                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 689         } else {
 690                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 691                 if (status)
 692                         return status;
 693                 READ_BUF(4);
 694                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 695         }
 696
 697         DECODE_TAIL;
 698 }
 699
 700 static __be32
 701 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 702 {
 703         DECODE_HEAD;
 704
 705         READ_BUF(32);
 706         lockt->lt_type = be32_to_cpup(p++);
 707         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 708                 goto xdr_error;
 709         p = xdr_decode_hyper(p, &lockt->lt_offset);
 710         p = xdr_decode_hyper(p, &lockt->lt_length);
 711         COPYMEM(&lockt->lt_clientid, 8);
 712         lockt->lt_owner.len = be32_to_cpup(p++);
 713         READ_BUF(lockt->lt_owner.len);
 714         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 715
 716         DECODE_TAIL;
 717 }
 718
 719 static __be32
 720 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 721 {
 722         DECODE_HEAD;
 723
 724         READ_BUF(8);
 725         locku->lu_type = be32_to_cpup(p++);
 726         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 727                 goto xdr_error;
 728         locku->lu_seqid = be32_to_cpup(p++);
 729         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 730         if (status)
 731                 return status;
 732         READ_BUF(16);
 733         p = xdr_decode_hyper(p, &locku->lu_offset);
 734         p = xdr_decode_hyper(p, &locku->lu_length);
 735
 736         DECODE_TAIL;
 737 }
 738
 739 static __be32
 740 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 741 {
 742         DECODE_HEAD;
 743
 744         READ_BUF(4);
 745         lookup->lo_len = be32_to_cpup(p++);
 746         READ_BUF(lookup->lo_len);
 747         SAVEMEM(lookup->lo_name, lookup->lo_len);
 748         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 749                 return status;
 750
 751         DECODE_TAIL;
 752 }
 753
 754 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 755 {
 756         __be32 *p;
 757         u32 w;
 758
 759         READ_BUF(4);
 760         w = be32_to_cpup(p++);
 761         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 762         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 763         if (deleg_when)
 764                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 765
 766         switch (w & NFS4_SHARE_ACCESS_MASK) {
 767         case NFS4_SHARE_ACCESS_READ:
 768         case NFS4_SHARE_ACCESS_WRITE:
 769         case NFS4_SHARE_ACCESS_BOTH:
 770                 break;
 771         default:
 772                 return nfserr_bad_xdr;
 773         }
 774         w &= ~NFS4_SHARE_ACCESS_MASK;
 775         if (!w)
 776                 return nfs_ok;
 777         if (!argp->minorversion)
 778                 return nfserr_bad_xdr;
 779         switch (w & NFS4_SHARE_WANT_MASK) {
 780         case NFS4_SHARE_WANT_NO_PREFERENCE:
 781         case NFS4_SHARE_WANT_READ_DELEG:
 782         case NFS4_SHARE_WANT_WRITE_DELEG:
 783         case NFS4_SHARE_WANT_ANY_DELEG:
 784         case NFS4_SHARE_WANT_NO_DELEG:
 785         case NFS4_SHARE_WANT_CANCEL:
 786                 break;
 787         default:
 788                 return nfserr_bad_xdr;
 789         }
 790         w &= ~NFS4_SHARE_WANT_MASK;
 791         if (!w)
 792                 return nfs_ok;
 793
 794         if (!deleg_when)        /* open_downgrade */
 795                 return nfserr_inval;
 796         switch (w) {
 797         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 798         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 799         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 800               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 801                 return nfs_ok;
 802         }
 803 xdr_error:
 804         return nfserr_bad_xdr;
 805 }
 806
 807 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 808 {
 809         __be32 *p;
 810
 811         READ_BUF(4);
 812         *x = be32_to_cpup(p++);
 813         /* Note: unlinke access bits, deny bits may be zero. */
 814         if (*x & ~NFS4_SHARE_DENY_BOTH)
 815                 return nfserr_bad_xdr;
 816         return nfs_ok;
 817 xdr_error:
 818         return nfserr_bad_xdr;
 819 }
 820
 821 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 822 {
 823         __be32 *p;
 824
 825         READ_BUF(4);
 826         o->len = be32_to_cpup(p++);
 827
 828         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 829                 return nfserr_bad_xdr;
 830
 831         READ_BUF(o->len);
 832         SAVEMEM(o->data, o->len);
 833         return nfs_ok;
 834 xdr_error:
 835         return nfserr_bad_xdr;
 836 }
 837
 838 static __be32
 839 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 840 {
 841         DECODE_HEAD;
 842         u32 dummy;
 843
 844         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 845         open->op_iattr.ia_valid = 0;
 846         open->op_openowner = NULL;
 847
 848         open->op_xdr_error = 0;
 849         /* seqid, share_access, share_deny, clientid, ownerlen */
 850         READ_BUF(4);
 851         open->op_seqid = be32_to_cpup(p++);
 852         /* decode, yet ignore deleg_when until supported */
 853         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 854                                            &open->op_deleg_want, &dummy);
 855         if (status)
 856                 goto xdr_error;
 857         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 858         if (status)
 859                 goto xdr_error;
 860         READ_BUF(sizeof(clientid_t));
 861         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 862         status = nfsd4_decode_opaque(argp, &open->op_owner);
 863         if (status)
 864                 goto xdr_error;
 865         READ_BUF(4);
 866         open->op_create = be32_to_cpup(p++);
 867         switch (open->op_create) {
 868         case NFS4_OPEN_NOCREATE:
 869                 break;
 870         case NFS4_OPEN_CREATE:
 871                 READ_BUF(4);
 872                 open->op_createmode = be32_to_cpup(p++);
 873                 switch (open->op_createmode) {
 874                 case NFS4_CREATE_UNCHECKED:
 875                 case NFS4_CREATE_GUARDED:
 876                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 877                                 &open->op_iattr, &open->op_acl, &open->op_label);
 878                         if (status)
 879                                 goto out;
 880                         break;
 881                 case NFS4_CREATE_EXCLUSIVE:
 882                         READ_BUF(NFS4_VERIFIER_SIZE);
 883                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 884                         break;
 885                 case NFS4_CREATE_EXCLUSIVE4_1:
 886                         if (argp->minorversion < 1)
 887                                 goto xdr_error;
 888                         READ_BUF(NFS4_VERIFIER_SIZE);
 889                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 890                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 891                                 &open->op_iattr, &open->op_acl, &open->op_label);
 892                         if (status)
 893                                 goto out;
 894                         break;
 895                 default:
 896                         goto xdr_error;
 897                 }
 898                 break;
 899         default:
 900                 goto xdr_error;
 901         }
 902
 903         /* open_claim */
 904         READ_BUF(4);
 905         open->op_claim_type = be32_to_cpup(p++);
 906         switch (open->op_claim_type) {
 907         case NFS4_OPEN_CLAIM_NULL:
 908         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 909                 READ_BUF(4);
 910                 open->op_fname.len = be32_to_cpup(p++);
 911                 READ_BUF(open->op_fname.len);
 912                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 913                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 914                         return status;
 915                 break;
 916         case NFS4_OPEN_CLAIM_PREVIOUS:
 917                 READ_BUF(4);
 918                 open->op_delegate_type = be32_to_cpup(p++);
 919                 break;
 920         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 921                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 922                 if (status)
 923                         return status;
 924                 READ_BUF(4);
 925                 open->op_fname.len = be32_to_cpup(p++);
 926                 READ_BUF(open->op_fname.len);
 927                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 928                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 929                         return status;
 930                 break;
 931         case NFS4_OPEN_CLAIM_FH:
 932         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 933                 if (argp->minorversion < 1)
 934                         goto xdr_error;
 935                 /* void */
 936                 break;
 937         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 938                 if (argp->minorversion < 1)
 939                         goto xdr_error;
 940                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 941                 if (status)
 942                         return status;
 943                 break;
 944         default:
 945                 goto xdr_error;
 946         }
 947
 948         DECODE_TAIL;
 949 }
 950
 951 static __be32
 952 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 953 {
 954         DECODE_HEAD;
 955
 956         if (argp->minorversion >= 1)
 957                 return nfserr_notsupp;
 958
 959         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 960         if (status)
 961                 return status;
 962         READ_BUF(4);
 963         open_conf->oc_seqid = be32_to_cpup(p++);
 964
 965         DECODE_TAIL;
 966 }
 967
 968 static __be32
 969 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 970 {
 971         DECODE_HEAD;
 972
 973         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 974         if (status)
 975                 return status;
 976         READ_BUF(4);
 977         open_down->od_seqid = be32_to_cpup(p++);
 978         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 979                                            &open_down->od_deleg_want, NULL);
 980         if (status)
 981                 return status;
 982         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 983         if (status)
 984                 return status;
 985         DECODE_TAIL;
 986 }
 987
 988 static __be32
 989 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 990 {
 991         DECODE_HEAD;
 992
 993         READ_BUF(4);
 994         putfh->pf_fhlen = be32_to_cpup(p++);
 995         if (putfh->pf_fhlen > NFS4_FHSIZE)
 996                 goto xdr_error;
 997         READ_BUF(putfh->pf_fhlen);
 998         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 999
1000         DECODE_TAIL;
1001 }
1002
1003 static __be32
1004 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1005 {
1006         if (argp->minorversion == 0)
1007                 return nfs_ok;
1008         return nfserr_notsupp;
1009 }
1010
1011 static __be32
1012 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1013 {
1014         DECODE_HEAD;
1015
1016         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1017         if (status)
1018                 return status;
1019         READ_BUF(12);
1020         p = xdr_decode_hyper(p, &read->rd_offset);
1021         read->rd_length = be32_to_cpup(p++);
1022
1023         DECODE_TAIL;
1024 }
1025
1026 static __be32
1027 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1028 {
1029         DECODE_HEAD;
1030
1031         READ_BUF(24);
1032         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1033         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1034         readdir->rd_dircount = be32_to_cpup(p++);
1035         readdir->rd_maxcount = be32_to_cpup(p++);
1036         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1037                 goto out;
1038
1039         DECODE_TAIL;
1040 }
1041
1042 static __be32
1043 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1044 {
1045         DECODE_HEAD;
1046
1047         READ_BUF(4);
1048         remove->rm_namelen = be32_to_cpup(p++);
1049         READ_BUF(remove->rm_namelen);
1050         SAVEMEM(remove->rm_name, remove->rm_namelen);
1051         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1052                 return status;
1053
1054         DECODE_TAIL;
1055 }
1056
1057 static __be32
1058 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1059 {
1060         DECODE_HEAD;
1061
1062         READ_BUF(4);
1063         rename->rn_snamelen = be32_to_cpup(p++);
1064         READ_BUF(rename->rn_snamelen);
1065         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1066         READ_BUF(4);
1067         rename->rn_tnamelen = be32_to_cpup(p++);
1068         READ_BUF(rename->rn_tnamelen);
1069         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1070         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1071                 return status;
1072         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1073                 return status;
1074
1075         DECODE_TAIL;
1076 }
1077
1078 static __be32
1079 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1080 {
1081         DECODE_HEAD;
1082
1083         if (argp->minorversion >= 1)
1084                 return nfserr_notsupp;
1085
1086         READ_BUF(sizeof(clientid_t));
1087         COPYMEM(clientid, sizeof(clientid_t));
1088
1089         DECODE_TAIL;
1090 }
1091
1092 static __be32
1093 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1094                      struct nfsd4_secinfo *secinfo)
1095 {
1096         DECODE_HEAD;
1097
1098         READ_BUF(4);
1099         secinfo->si_namelen = be32_to_cpup(p++);
1100         READ_BUF(secinfo->si_namelen);
1101         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1102         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1103         if (status)
1104                 return status;
1105         DECODE_TAIL;
1106 }
1107
1108 static __be32
1109 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1110                      struct nfsd4_secinfo_no_name *sin)
1111 {
1112         DECODE_HEAD;
1113
1114         READ_BUF(4);
1115         sin->sin_style = be32_to_cpup(p++);
1116         DECODE_TAIL;
1117 }
1118
1119 static __be32
1120 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1121 {
1122         __be32 status;
1123
1124         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1125         if (status)
1126                 return status;
1127         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1128                                   &setattr->sa_acl, &setattr->sa_label);
1129 }
1130
1131 static __be32
1132 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1133 {
1134         DECODE_HEAD;
1135
1136         if (argp->minorversion >= 1)
1137                 return nfserr_notsupp;
1138
1139         READ_BUF(NFS4_VERIFIER_SIZE);
1140         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1141
1142         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1143         if (status)
1144                 return nfserr_bad_xdr;
1145         READ_BUF(8);
1146         setclientid->se_callback_prog = be32_to_cpup(p++);
1147         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1148         READ_BUF(setclientid->se_callback_netid_len);
1149         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1150         READ_BUF(4);
1151         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1152
1153         READ_BUF(setclientid->se_callback_addr_len);
1154         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1155         READ_BUF(4);
1156         setclientid->se_callback_ident = be32_to_cpup(p++);
1157
1158         DECODE_TAIL;
1159 }
1160
1161 static __be32
1162 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1163 {
1164         DECODE_HEAD;
1165
1166         if (argp->minorversion >= 1)
1167                 return nfserr_notsupp;
1168
1169         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1170         COPYMEM(&scd_c->sc_clientid, 8);
1171         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1172
1173         DECODE_TAIL;
1174 }
1175
1176 /* Also used for NVERIFY */
1177 static __be32
1178 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1179 {
1180         DECODE_HEAD;
1181
1182         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1183                 goto out;
1184
1185         /* For convenience's sake, we compare raw xdr'd attributes in
1186          * nfsd4_proc_verify */
1187
1188         READ_BUF(4);
1189         verify->ve_attrlen = be32_to_cpup(p++);
1190         READ_BUF(verify->ve_attrlen);
1191         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1192
1193         DECODE_TAIL;
1194 }
1195
1196 static __be32
1197 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1198 {
1199         int avail;
1200         int len;
1201         DECODE_HEAD;
1202
1203         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1204         if (status)
1205                 return status;
1206         READ_BUF(16);
1207         p = xdr_decode_hyper(p, &write->wr_offset);
1208         write->wr_stable_how = be32_to_cpup(p++);
1209         if (write->wr_stable_how > 2)
1210                 goto xdr_error;
1211         write->wr_buflen = be32_to_cpup(p++);
1212
1213         /* Sorry .. no magic macros for this.. *
1214          * READ_BUF(write->wr_buflen);
1215          * SAVEMEM(write->wr_buf, write->wr_buflen);
1216          */
1217         avail = (char*)argp->end - (char*)argp->p;
1218         if (avail + argp->pagelen < write->wr_buflen) {
1219                 dprintk("NFSD: xdr error (%s:%d)\n",
1220                                 __FILE__, __LINE__);
1221                 goto xdr_error;
1222         }
1223         write->wr_head.iov_base = p;
1224         write->wr_head.iov_len = avail;
1225         write->wr_pagelist = argp->pagelist;
1226
1227         len = XDR_QUADLEN(write->wr_buflen) << 2;
1228         if (len >= avail) {
1229                 int pages;
1230
1231                 len -= avail;
1232
1233                 pages = len >> PAGE_SHIFT;
1234                 argp->pagelist += pages;
1235                 argp->pagelen -= pages * PAGE_SIZE;
1236                 len -= pages * PAGE_SIZE;
1237
1238                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1239                 argp->pagelist++;
1240                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1241         }
1242         argp->p += XDR_QUADLEN(len);
1243
1244         DECODE_TAIL;
1245 }
1246
1247 static __be32
1248 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1249 {
1250         DECODE_HEAD;
1251
1252         if (argp->minorversion >= 1)
1253                 return nfserr_notsupp;
1254
1255         READ_BUF(12);
1256         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1257         rlockowner->rl_owner.len = be32_to_cpup(p++);
1258         READ_BUF(rlockowner->rl_owner.len);
1259         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1260
1261         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1262                 return nfserr_inval;
1263         DECODE_TAIL;
1264 }
1265
1266 static __be32
1267 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1268                          struct nfsd4_exchange_id *exid)
1269 {
1270         int dummy, tmp;
1271         DECODE_HEAD;
1272
1273         READ_BUF(NFS4_VERIFIER_SIZE);
1274         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1275
1276         status = nfsd4_decode_opaque(argp, &exid->clname);
1277         if (status)
1278                 return nfserr_bad_xdr;
1279
1280         READ_BUF(4);
1281         exid->flags = be32_to_cpup(p++);
1282
1283         /* Ignore state_protect4_a */
1284         READ_BUF(4);
1285         exid->spa_how = be32_to_cpup(p++);
1286         switch (exid->spa_how) {
1287         case SP4_NONE:
1288                 break;
1289         case SP4_MACH_CRED:
1290                 /* spo_must_enforce */
1291                 READ_BUF(4);
1292                 dummy = be32_to_cpup(p++);
1293                 READ_BUF(dummy * 4);
1294                 p += dummy;
1295
1296                 /* spo_must_allow */
1297                 READ_BUF(4);
1298                 dummy = be32_to_cpup(p++);
1299                 READ_BUF(dummy * 4);
1300                 p += dummy;
1301                 break;
1302         case SP4_SSV:
1303                 /* ssp_ops */
1304                 READ_BUF(4);
1305                 dummy = be32_to_cpup(p++);
1306                 READ_BUF(dummy * 4);
1307                 p += dummy;
1308
1309                 READ_BUF(4);
1310                 dummy = be32_to_cpup(p++);
1311                 READ_BUF(dummy * 4);
1312                 p += dummy;
1313
1314                 /* ssp_hash_algs<> */
1315                 READ_BUF(4);
1316                 tmp = be32_to_cpup(p++);
1317                 while (tmp--) {
1318                         READ_BUF(4);
1319                         dummy = be32_to_cpup(p++);
1320                         READ_BUF(dummy);
1321                         p += XDR_QUADLEN(dummy);
1322                 }
1323
1324                 /* ssp_encr_algs<> */
1325                 READ_BUF(4);
1326                 tmp = be32_to_cpup(p++);
1327                 while (tmp--) {
1328                         READ_BUF(4);
1329                         dummy = be32_to_cpup(p++);
1330                         READ_BUF(dummy);
1331                         p += XDR_QUADLEN(dummy);
1332                 }
1333
1334                 /* ssp_window and ssp_num_gss_handles */
1335                 READ_BUF(8);
1336                 dummy = be32_to_cpup(p++);
1337                 dummy = be32_to_cpup(p++);
1338                 break;
1339         default:
1340                 goto xdr_error;
1341         }
1342
1343         /* Ignore Implementation ID */
1344         READ_BUF(4);    /* nfs_impl_id4 array length */
1345         dummy = be32_to_cpup(p++);
1346
1347         if (dummy > 1)
1348                 goto xdr_error;
1349
1350         if (dummy == 1) {
1351                 /* nii_domain */
1352                 READ_BUF(4);
1353                 dummy = be32_to_cpup(p++);
1354                 READ_BUF(dummy);
1355                 p += XDR_QUADLEN(dummy);
1356
1357                 /* nii_name */
1358                 READ_BUF(4);
1359                 dummy = be32_to_cpup(p++);
1360                 READ_BUF(dummy);
1361                 p += XDR_QUADLEN(dummy);
1362
1363                 /* nii_date */
1364                 READ_BUF(12);
1365                 p += 3;
1366         }
1367         DECODE_TAIL;
1368 }
1369
1370 static __be32
1371 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1372                             struct nfsd4_create_session *sess)
1373 {
1374         DECODE_HEAD;
1375         u32 dummy;
1376
1377         READ_BUF(16);
1378         COPYMEM(&sess->clientid, 8);
1379         sess->seqid = be32_to_cpup(p++);
1380         sess->flags = be32_to_cpup(p++);
1381
1382         /* Fore channel attrs */
1383         READ_BUF(28);
1384         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1385         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1386         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1387         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1388         sess->fore_channel.maxops = be32_to_cpup(p++);
1389         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1390         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1391         if (sess->fore_channel.nr_rdma_attrs == 1) {
1392                 READ_BUF(4);
1393                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1394         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1395                 dprintk("Too many fore channel attr bitmaps!\n");
1396                 goto xdr_error;
1397         }
1398
1399         /* Back channel attrs */
1400         READ_BUF(28);
1401         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1402         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1403         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1404         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1405         sess->back_channel.maxops = be32_to_cpup(p++);
1406         sess->back_channel.maxreqs = be32_to_cpup(p++);
1407         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1408         if (sess->back_channel.nr_rdma_attrs == 1) {
1409                 READ_BUF(4);
1410                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1411         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1412                 dprintk("Too many back channel attr bitmaps!\n");
1413                 goto xdr_error;
1414         }
1415
1416         READ_BUF(4);
1417         sess->callback_prog = be32_to_cpup(p++);
1418         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1419         DECODE_TAIL;
1420 }
1421
1422 static __be32
1423 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1424                              struct nfsd4_destroy_session *destroy_session)
1425 {
1426         DECODE_HEAD;
1427         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1428         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1429
1430         DECODE_TAIL;
1431 }
1432
1433 static __be32
1434 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1435                           struct nfsd4_free_stateid *free_stateid)
1436 {
1437         DECODE_HEAD;
1438
1439         READ_BUF(sizeof(stateid_t));
1440         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1441         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1442
1443         DECODE_TAIL;
1444 }
1445
1446 static __be32
1447 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1448                       struct nfsd4_sequence *seq)
1449 {
1450         DECODE_HEAD;
1451
1452         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1453         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1454         seq->seqid = be32_to_cpup(p++);
1455         seq->slotid = be32_to_cpup(p++);
1456         seq->maxslots = be32_to_cpup(p++);
1457         seq->cachethis = be32_to_cpup(p++);
1458
1459         DECODE_TAIL;
1460 }
1461
1462 static __be32
1463 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1464 {
1465         int i;
1466         __be32 *p, status;
1467         struct nfsd4_test_stateid_id *stateid;
1468
1469         READ_BUF(4);
1470         test_stateid->ts_num_ids = ntohl(*p++);
1471
1472         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1473
1474         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1475                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1476                 if (!stateid) {
1477                         status = nfserrno(-ENOMEM);
1478                         goto out;
1479                 }
1480
1481                 INIT_LIST_HEAD(&stateid->ts_id_list);
1482                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1483
1484                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1485                 if (status)
1486                         goto out;
1487         }
1488
1489         status = 0;
1490 out:
1491         return status;
1492 xdr_error:
1493         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1494         status = nfserr_bad_xdr;
1495         goto out;
1496 }
1497
1498 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1499 {
1500         DECODE_HEAD;
1501
1502         READ_BUF(8);
1503         COPYMEM(&dc->clientid, 8);
1504
1505         DECODE_TAIL;
1506 }
1507
1508 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1509 {
1510         DECODE_HEAD;
1511
1512         READ_BUF(4);
1513         rc->rca_one_fs = be32_to_cpup(p++);
1514
1515         DECODE_TAIL;
1516 }
1517
1518 static __be32
1519 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1520 {
1521         DECODE_HEAD;
1522
1523         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1524         if (status)
1525                 return status;
1526
1527         READ_BUF(8 + 4);
1528         p = xdr_decode_hyper(p, &seek->seek_offset);
1529         seek->seek_whence = be32_to_cpup(p);
1530
1531         DECODE_TAIL;
1532 }
1533
1534 static __be32
1535 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1536 {
1537         return nfs_ok;
1538 }
1539
1540 static __be32
1541 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1542 {
1543         return nfserr_notsupp;
1544 }
1545
1546 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1547
1548 static nfsd4_dec nfsd4_dec_ops[] = {
1549         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1550         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1551         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1552         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1553         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1554         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1555         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1556         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1557         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1558         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1559         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1560         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1561         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1562         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1563         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1564         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1565         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1566         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1567         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1568         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1569         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1570         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1571         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1572         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1573         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1574         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1575         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1576         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1577         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1578         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1579         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1580         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1581         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1582         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1583         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1584         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1585         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1586
1587         /* new operations for NFSv4.1 */
1588         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1589         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1590         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1591         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1592         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1593         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1594         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1595         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1596         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1597         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1598         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1599         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1600         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1601         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1602         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1603         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1604         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1605         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1606         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1607
1608         /* new operations for NFSv4.2 */
1609         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_notsupp,
1610         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_notsupp,
1611         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1612         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1613         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1614         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1615         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1616         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1617         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1618         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1619         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1620         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1621 };
1622
1623 static inline bool
1624 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1625 {
1626         if (op->opnum < FIRST_NFS4_OP)
1627                 return false;
1628         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1629                 return false;
1630         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1631                 return false;
1632         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1633                 return false;
1634         return true;
1635 }
1636
1637 static __be32
1638 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1639 {
1640         DECODE_HEAD;
1641         struct nfsd4_op *op;
1642         bool cachethis = false;
1643         int auth_slack= argp->rqstp->rq_auth_slack;
1644         int max_reply = auth_slack + 8; /* opcnt, status */
1645         int readcount = 0;
1646         int readbytes = 0;
1647         int i;
1648
1649         READ_BUF(4);
1650         argp->taglen = be32_to_cpup(p++);
1651         READ_BUF(argp->taglen);
1652         SAVEMEM(argp->tag, argp->taglen);
1653         READ_BUF(8);
1654         argp->minorversion = be32_to_cpup(p++);
1655         argp->opcnt = be32_to_cpup(p++);
1656         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1657
1658         if (argp->taglen > NFSD4_MAX_TAGLEN)
1659                 goto xdr_error;
1660         if (argp->opcnt > 100)
1661                 goto xdr_error;
1662
1663         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1664                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1665                 if (!argp->ops) {
1666                         argp->ops = argp->iops;
1667                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1668                         goto xdr_error;
1669                 }
1670         }
1671
1672         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1673                 argp->opcnt = 0;
1674
1675         for (i = 0; i < argp->opcnt; i++) {
1676                 op = &argp->ops[i];
1677                 op->replay = NULL;
1678
1679                 READ_BUF(4);
1680                 op->opnum = be32_to_cpup(p++);
1681
1682                 if (nfsd4_opnum_in_range(argp, op))
1683                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1684                 else {
1685                         op->opnum = OP_ILLEGAL;
1686                         op->status = nfserr_op_illegal;
1687                 }
1688                 /*
1689                  * We'll try to cache the result in the DRC if any one
1690                  * op in the compound wants to be cached:
1691                  */
1692                 cachethis |= nfsd4_cache_this_op(op);
1693
1694                 if (op->opnum == OP_READ) {
1695                         readcount++;
1696                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1697                 } else
1698                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1699                 /*
1700                  * OP_LOCK may return a conflicting lock.  (Special case
1701                  * because it will just skip encoding this if it runs
1702                  * out of xdr buffer space, and it is the only operation
1703                  * that behaves this way.)
1704                  */
1705                 if (op->opnum == OP_LOCK)
1706                         max_reply += NFS4_OPAQUE_LIMIT;
1707
1708                 if (op->status) {
1709                         argp->opcnt = i+1;
1710                         break;
1711                 }
1712         }
1713         /* Sessions make the DRC unnecessary: */
1714         if (argp->minorversion)
1715                 cachethis = false;
1716         svc_reserve(argp->rqstp, max_reply + readbytes);
1717         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1718
1719         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1720                 argp->rqstp->rq_splice_ok = false;
1721
1722         DECODE_TAIL;
1723 }
1724
1725 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1726 {
1727         if (IS_I_VERSION(inode)) {
1728                 p = xdr_encode_hyper(p, inode->i_version);
1729         } else {
1730                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1731                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1732         }
1733         return p;
1734 }
1735
1736 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1737 {
1738         *p++ = cpu_to_be32(c->atomic);
1739         if (c->change_supported) {
1740                 p = xdr_encode_hyper(p, c->before_change);
1741                 p = xdr_encode_hyper(p, c->after_change);
1742         } else {
1743                 *p++ = cpu_to_be32(c->before_ctime_sec);
1744                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1745                 *p++ = cpu_to_be32(c->after_ctime_sec);
1746                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1747         }
1748         return p;
1749 }
1750
1751 /* Encode as an array of strings the string given with components
1752  * separated @sep, escaped with esc_enter and esc_exit.
1753  */
1754 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1755                                           char *components, char esc_enter,
1756                                           char esc_exit)
1757 {
1758         __be32 *p;
1759         __be32 pathlen;
1760         int pathlen_offset;
1761         int strlen, count=0;
1762         char *str, *end, *next;
1763
1764         dprintk("nfsd4_encode_components(%s)\n", components);
1765
1766         pathlen_offset = xdr->buf->len;
1767         p = xdr_reserve_space(xdr, 4);
1768         if (!p)
1769                 return nfserr_resource;
1770         p++; /* We will fill this in with @count later */
1771
1772         end = str = components;
1773         while (*end) {
1774                 bool found_esc = false;
1775
1776                 /* try to parse as esc_start, ..., esc_end, sep */
1777                 if (*str == esc_enter) {
1778                         for (; *end && (*end != esc_exit); end++)
1779                                 /* find esc_exit or end of string */;
1780                         next = end + 1;
1781                         if (*end && (!*next || *next == sep)) {
1782                                 str++;
1783                                 found_esc = true;
1784                         }
1785                 }
1786
1787                 if (!found_esc)
1788                         for (; *end && (*end != sep); end++)
1789                                 /* find sep or end of string */;
1790
1791                 strlen = end - str;
1792                 if (strlen) {
1793                         p = xdr_reserve_space(xdr, strlen + 4);
1794                         if (!p)
1795                                 return nfserr_resource;
1796                         p = xdr_encode_opaque(p, str, strlen);
1797                         count++;
1798                 }
1799                 else
1800                         end++;
1801                 if (found_esc)
1802                         end = next;
1803
1804                 str = end;
1805         }
1806         pathlen = htonl(count);
1807         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1808         return 0;
1809 }
1810
1811 /* Encode as an array of strings the string given with components
1812  * separated @sep.
1813  */
1814 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1815                                       char *components)
1816 {
1817         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1818 }
1819
1820 /*
1821  * encode a location element of a fs_locations structure
1822  */
1823 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1824                                         struct nfsd4_fs_location *location)
1825 {
1826         __be32 status;
1827
1828         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1829                                                 '[', ']');
1830         if (status)
1831                 return status;
1832         status = nfsd4_encode_components(xdr, '/', location->path);
1833         if (status)
1834                 return status;
1835         return 0;
1836 }
1837
1838 /*
1839  * Encode a path in RFC3530 'pathname4' format
1840  */
1841 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
1842                                 const struct path *root,
1843                                 const struct path *path)
1844 {
1845         struct path cur = *path;
1846         __be32 *p;
1847         struct dentry **components = NULL;
1848         unsigned int ncomponents = 0;
1849         __be32 err = nfserr_jukebox;
1850
1851         dprintk("nfsd4_encode_components(");
1852
1853         path_get(&cur);
1854         /* First walk the path up to the nfsd root, and store the
1855          * dentries/path components in an array.
1856          */
1857         for (;;) {
1858                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1859                         break;
1860                 if (cur.dentry == cur.mnt->mnt_root) {
1861                         if (follow_up(&cur))
1862                                 continue;
1863                         goto out_free;
1864                 }
1865                 if ((ncomponents & 15) == 0) {
1866                         struct dentry **new;
1867                         new = krealloc(components,
1868                                         sizeof(*new) * (ncomponents + 16),
1869                                         GFP_KERNEL);
1870                         if (!new)
1871                                 goto out_free;
1872                         components = new;
1873                 }
1874                 components[ncomponents++] = cur.dentry;
1875                 cur.dentry = dget_parent(cur.dentry);
1876         }
1877         err = nfserr_resource;
1878         p = xdr_reserve_space(xdr, 4);
1879         if (!p)
1880                 goto out_free;
1881         *p++ = cpu_to_be32(ncomponents);
1882
1883         while (ncomponents) {
1884                 struct dentry *dentry = components[ncomponents - 1];
1885                 unsigned int len;
1886
1887                 spin_lock(&dentry->d_lock);
1888                 len = dentry->d_name.len;
1889                 p = xdr_reserve_space(xdr, len + 4);
1890                 if (!p) {
1891                         spin_unlock(&dentry->d_lock);
1892                         goto out_free;
1893                 }
1894                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
1895                 dprintk("/%s", dentry->d_name.name);
1896                 spin_unlock(&dentry->d_lock);
1897                 dput(dentry);
1898                 ncomponents--;
1899         }
1900
1901         err = 0;
1902 out_free:
1903         dprintk(")\n");
1904         while (ncomponents)
1905                 dput(components[--ncomponents]);
1906         kfree(components);
1907         path_put(&cur);
1908         return err;
1909 }
1910
1911 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
1912                         struct svc_rqst *rqstp, const struct path *path)
1913 {
1914         struct svc_export *exp_ps;
1915         __be32 res;
1916
1917         exp_ps = rqst_find_fsidzero_export(rqstp);
1918         if (IS_ERR(exp_ps))
1919                 return nfserrno(PTR_ERR(exp_ps));
1920         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
1921         exp_put(exp_ps);
1922         return res;
1923 }
1924
1925 /*
1926  *  encode a fs_locations structure
1927  */
1928 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
1929                         struct svc_rqst *rqstp, struct svc_export *exp)
1930 {
1931         __be32 status;
1932         int i;
1933         __be32 *p;
1934         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1935
1936         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1937         if (status)
1938                 return status;
1939         p = xdr_reserve_space(xdr, 4);
1940         if (!p)
1941                 return nfserr_resource;
1942         *p++ = cpu_to_be32(fslocs->locations_count);
1943         for (i=0; i<fslocs->locations_count; i++) {
1944                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1945                 if (status)
1946                         return status;
1947         }
1948         return 0;
1949 }
1950
1951 static u32 nfs4_file_type(umode_t mode)
1952 {
1953         switch (mode & S_IFMT) {
1954         case S_IFIFO:   return NF4FIFO;
1955         case S_IFCHR:   return NF4CHR;
1956         case S_IFDIR:   return NF4DIR;
1957         case S_IFBLK:   return NF4BLK;
1958         case S_IFLNK:   return NF4LNK;
1959         case S_IFREG:   return NF4REG;
1960         case S_IFSOCK:  return NF4SOCK;
1961         default:        return NF4BAD;
1962         };
1963 }
1964
1965 static inline __be32
1966 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1967                      struct nfs4_ace *ace)
1968 {
1969         if (ace->whotype != NFS4_ACL_WHO_NAMED)
1970                 return nfs4_acl_write_who(xdr, ace->whotype);
1971         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1972                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1973         else
1974                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1975 }
1976
1977 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1978                               FATTR4_WORD0_RDATTR_ERROR)
1979 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1980 #define WORD2_ABSENT_FS_ATTRS 0
1981
1982 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1983 static inline __be32
1984 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1985                             void *context, int len)
1986 {
1987         __be32 *p;
1988
1989         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
1990         if (!p)
1991                 return nfserr_resource;
1992
1993         /*
1994          * For now we use a 0 here to indicate the null translation; in
1995          * the future we may place a call to translation code here.
1996          */
1997         *p++ = cpu_to_be32(0); /* lfs */
1998         *p++ = cpu_to_be32(0); /* pi */
1999         p = xdr_encode_opaque(p, context, len);
2000         return 0;
2001 }
2002 #else
2003 static inline __be32
2004 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2005                             void *context, int len)
2006 { return 0; }
2007 #endif
2008
2009 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2010 {
2011         /* As per referral draft:  */
2012         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2013             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2014                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2015                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2016                         *rdattr_err = NFSERR_MOVED;
2017                 else
2018                         return nfserr_moved;
2019         }
2020         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2021         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2022         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2023         return 0;
2024 }
2025
2026
2027 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2028 {
2029         struct path path = exp->ex_path;
2030         int err;
2031
2032         path_get(&path);
2033         while (follow_up(&path)) {
2034                 if (path.dentry != path.mnt->mnt_root)
2035                         break;
2036         }
2037         err = vfs_getattr(&path, stat);
2038         path_put(&path);
2039         return err;
2040 }
2041
2042 /*
2043  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2044  * ourselves.
2045  */
2046 static __be32
2047 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2048                 struct svc_export *exp,
2049                 struct dentry *dentry, u32 *bmval,
2050                 struct svc_rqst *rqstp, int ignore_crossmnt)
2051 {
2052         u32 bmval0 = bmval[0];
2053         u32 bmval1 = bmval[1];
2054         u32 bmval2 = bmval[2];
2055         struct kstat stat;
2056         struct svc_fh *tempfh = NULL;
2057         struct kstatfs statfs;
2058         __be32 *p;
2059         int starting_len = xdr->buf->len;
2060         int attrlen_offset;
2061         __be32 attrlen;
2062         u32 dummy;
2063         u64 dummy64;
2064         u32 rdattr_err = 0;
2065         __be32 status;
2066         int err;
2067         int aclsupport = 0;
2068         struct nfs4_acl *acl = NULL;
2069         void *context = NULL;
2070         int contextlen;
2071         bool contextsupport = false;
2072         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2073         u32 minorversion = resp->cstate.minorversion;
2074         struct path path = {
2075                 .mnt    = exp->ex_path.mnt,
2076                 .dentry = dentry,
2077         };
2078         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2079
2080         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2081         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2082         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2083         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2084
2085         if (exp->ex_fslocs.migrated) {
2086                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2087                 if (status)
2088                         goto out;
2089         }
2090
2091         err = vfs_getattr(&path, &stat);
2092         if (err)
2093                 goto out_nfserr;
2094         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2095                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2096             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2097                        FATTR4_WORD1_SPACE_TOTAL))) {
2098                 err = vfs_statfs(&path, &statfs);
2099                 if (err)
2100                         goto out_nfserr;
2101         }
2102         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2103                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2104                 status = nfserr_jukebox;
2105                 if (!tempfh)
2106                         goto out;
2107                 fh_init(tempfh, NFS4_FHSIZE);
2108                 status = fh_compose(tempfh, exp, dentry, NULL);
2109                 if (status)
2110                         goto out;
2111                 fhp = tempfh;
2112         }
2113         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2114                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2115                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2116                 aclsupport = (err == 0);
2117                 if (bmval0 & FATTR4_WORD0_ACL) {
2118                         if (err == -EOPNOTSUPP)
2119                                 bmval0 &= ~FATTR4_WORD0_ACL;
2120                         else if (err == -EINVAL) {
2121                                 status = nfserr_attrnotsupp;
2122                                 goto out;
2123                         } else if (err != 0)
2124                                 goto out_nfserr;
2125                 }
2126         }
2127
2128 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2129         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2130              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2131                 err = security_inode_getsecctx(dentry->d_inode,
2132                                                 &context, &contextlen);
2133                 contextsupport = (err == 0);
2134                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2135                         if (err == -EOPNOTSUPP)
2136                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2137                         else if (err)
2138                                 goto out_nfserr;
2139                 }
2140         }
2141 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2142
2143         if (bmval2) {
2144                 p = xdr_reserve_space(xdr, 16);
2145                 if (!p)
2146                         goto out_resource;
2147                 *p++ = cpu_to_be32(3);
2148                 *p++ = cpu_to_be32(bmval0);
2149                 *p++ = cpu_to_be32(bmval1);
2150                 *p++ = cpu_to_be32(bmval2);
2151         } else if (bmval1) {
2152                 p = xdr_reserve_space(xdr, 12);
2153                 if (!p)
2154                         goto out_resource;
2155                 *p++ = cpu_to_be32(2);
2156                 *p++ = cpu_to_be32(bmval0);
2157                 *p++ = cpu_to_be32(bmval1);
2158         } else {
2159                 p = xdr_reserve_space(xdr, 8);
2160                 if (!p)
2161                         goto out_resource;
2162                 *p++ = cpu_to_be32(1);
2163                 *p++ = cpu_to_be32(bmval0);
2164         }
2165
2166         attrlen_offset = xdr->buf->len;
2167         p = xdr_reserve_space(xdr, 4);
2168         if (!p)
2169                 goto out_resource;
2170         p++;                /* to be backfilled later */
2171
2172         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2173                 u32 word0 = nfsd_suppattrs0(minorversion);
2174                 u32 word1 = nfsd_suppattrs1(minorversion);
2175                 u32 word2 = nfsd_suppattrs2(minorversion);
2176
2177                 if (!aclsupport)
2178                         word0 &= ~FATTR4_WORD0_ACL;
2179                 if (!contextsupport)
2180                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2181                 if (!word2) {
2182                         p = xdr_reserve_space(xdr, 12);
2183                         if (!p)
2184                                 goto out_resource;
2185                         *p++ = cpu_to_be32(2);
2186                         *p++ = cpu_to_be32(word0);
2187                         *p++ = cpu_to_be32(word1);
2188                 } else {
2189                         p = xdr_reserve_space(xdr, 16);
2190                         if (!p)
2191                                 goto out_resource;
2192                         *p++ = cpu_to_be32(3);
2193                         *p++ = cpu_to_be32(word0);
2194                         *p++ = cpu_to_be32(word1);
2195                         *p++ = cpu_to_be32(word2);
2196                 }
2197         }
2198         if (bmval0 & FATTR4_WORD0_TYPE) {
2199                 p = xdr_reserve_space(xdr, 4);
2200                 if (!p)
2201                         goto out_resource;
2202                 dummy = nfs4_file_type(stat.mode);
2203                 if (dummy == NF4BAD) {
2204                         status = nfserr_serverfault;
2205                         goto out;
2206                 }
2207                 *p++ = cpu_to_be32(dummy);
2208         }
2209         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2210                 p = xdr_reserve_space(xdr, 4);
2211                 if (!p)
2212                         goto out_resource;
2213                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2214                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2215                 else
2216                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2217                                                 NFS4_FH_VOL_RENAME);
2218         }
2219         if (bmval0 & FATTR4_WORD0_CHANGE) {
2220                 p = xdr_reserve_space(xdr, 8);
2221                 if (!p)
2222                         goto out_resource;
2223                 p = encode_change(p, &stat, dentry->d_inode);
2224         }
2225         if (bmval0 & FATTR4_WORD0_SIZE) {
2226                 p = xdr_reserve_space(xdr, 8);
2227                 if (!p)
2228                         goto out_resource;
2229                 p = xdr_encode_hyper(p, stat.size);
2230         }
2231         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2232                 p = xdr_reserve_space(xdr, 4);
2233                 if (!p)
2234                         goto out_resource;
2235                 *p++ = cpu_to_be32(1);
2236         }
2237         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2238                 p = xdr_reserve_space(xdr, 4);
2239                 if (!p)
2240                         goto out_resource;
2241                 *p++ = cpu_to_be32(1);
2242         }
2243         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2244                 p = xdr_reserve_space(xdr, 4);
2245                 if (!p)
2246                         goto out_resource;
2247                 *p++ = cpu_to_be32(0);
2248         }
2249         if (bmval0 & FATTR4_WORD0_FSID) {
2250                 p = xdr_reserve_space(xdr, 16);
2251                 if (!p)
2252                         goto out_resource;
2253                 if (exp->ex_fslocs.migrated) {
2254                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2255                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2256                 } else switch(fsid_source(fhp)) {
2257                 case FSIDSOURCE_FSID:
2258                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2259                         p = xdr_encode_hyper(p, (u64)0);
2260                         break;
2261                 case FSIDSOURCE_DEV:
2262                         *p++ = cpu_to_be32(0);
2263                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2264                         *p++ = cpu_to_be32(0);
2265                         *p++ = cpu_to_be32(MINOR(stat.dev));
2266                         break;
2267                 case FSIDSOURCE_UUID:
2268                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2269                                                                 EX_UUID_LEN);
2270                         break;
2271                 }
2272         }
2273         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2274                 p = xdr_reserve_space(xdr, 4);
2275                 if (!p)
2276                         goto out_resource;
2277                 *p++ = cpu_to_be32(0);
2278         }
2279         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2280                 p = xdr_reserve_space(xdr, 4);
2281                 if (!p)
2282                         goto out_resource;
2283                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2284         }
2285         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2286                 p = xdr_reserve_space(xdr, 4);
2287                 if (!p)
2288                         goto out_resource;
2289                 *p++ = cpu_to_be32(rdattr_err);
2290         }
2291         if (bmval0 & FATTR4_WORD0_ACL) {
2292                 struct nfs4_ace *ace;
2293
2294                 if (acl == NULL) {
2295                         p = xdr_reserve_space(xdr, 4);
2296                         if (!p)
2297                                 goto out_resource;
2298
2299                         *p++ = cpu_to_be32(0);
2300                         goto out_acl;
2301                 }
2302                 p = xdr_reserve_space(xdr, 4);
2303                 if (!p)
2304                         goto out_resource;
2305                 *p++ = cpu_to_be32(acl->naces);
2306
2307                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2308                         p = xdr_reserve_space(xdr, 4*3);
2309                         if (!p)
2310                                 goto out_resource;
2311                         *p++ = cpu_to_be32(ace->type);
2312                         *p++ = cpu_to_be32(ace->flag);
2313                         *p++ = cpu_to_be32(ace->access_mask &
2314                                                         NFS4_ACE_MASK_ALL);
2315                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2316                         if (status)
2317                                 goto out;
2318                 }
2319         }
2320 out_acl:
2321         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2322                 p = xdr_reserve_space(xdr, 4);
2323                 if (!p)
2324                         goto out_resource;
2325                 *p++ = cpu_to_be32(aclsupport ?
2326                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2327         }
2328         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2329                 p = xdr_reserve_space(xdr, 4);
2330                 if (!p)
2331                         goto out_resource;
2332                 *p++ = cpu_to_be32(1);
2333         }
2334         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2335                 p = xdr_reserve_space(xdr, 4);
2336                 if (!p)
2337                         goto out_resource;
2338                 *p++ = cpu_to_be32(0);
2339         }
2340         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2341                 p = xdr_reserve_space(xdr, 4);
2342                 if (!p)
2343                         goto out_resource;
2344                 *p++ = cpu_to_be32(1);
2345         }
2346         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2347                 p = xdr_reserve_space(xdr, 4);
2348                 if (!p)
2349                         goto out_resource;
2350                 *p++ = cpu_to_be32(1);
2351         }
2352         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2353                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2354                 if (!p)
2355                         goto out_resource;
2356                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2357                                         fhp->fh_handle.fh_size);
2358         }
2359         if (bmval0 & FATTR4_WORD0_FILEID) {
2360                 p = xdr_reserve_space(xdr, 8);
2361                 if (!p)
2362                         goto out_resource;
2363                 p = xdr_encode_hyper(p, stat.ino);
2364         }
2365         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2366                 p = xdr_reserve_space(xdr, 8);
2367                 if (!p)
2368                         goto out_resource;
2369                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2370         }
2371         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2372                 p = xdr_reserve_space(xdr, 8);
2373                 if (!p)
2374                         goto out_resource;
2375                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2376         }
2377         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2378                 p = xdr_reserve_space(xdr, 8);
2379                 if (!p)
2380                         goto out_resource;
2381                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2382         }
2383         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2384                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2385                 if (status)
2386                         goto out;
2387         }
2388         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2389                 p = xdr_reserve_space(xdr, 4);
2390                 if (!p)
2391                         goto out_resource;
2392                 *p++ = cpu_to_be32(1);
2393         }
2394         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2395                 p = xdr_reserve_space(xdr, 8);
2396                 if (!p)
2397                         goto out_resource;
2398                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2399         }
2400         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2401                 p = xdr_reserve_space(xdr, 4);
2402                 if (!p)
2403                         goto out_resource;
2404                 *p++ = cpu_to_be32(255);
2405         }
2406         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2407                 p = xdr_reserve_space(xdr, 4);
2408                 if (!p)
2409                         goto out_resource;
2410                 *p++ = cpu_to_be32(statfs.f_namelen);
2411         }
2412         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2413                 p = xdr_reserve_space(xdr, 8);
2414                 if (!p)
2415                         goto out_resource;
2416                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2417         }
2418         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2419                 p = xdr_reserve_space(xdr, 8);
2420                 if (!p)
2421                         goto out_resource;
2422                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2423         }
2424         if (bmval1 & FATTR4_WORD1_MODE) {
2425                 p = xdr_reserve_space(xdr, 4);
2426                 if (!p)
2427                         goto out_resource;
2428                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2429         }
2430         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2431                 p = xdr_reserve_space(xdr, 4);
2432                 if (!p)
2433                         goto out_resource;
2434                 *p++ = cpu_to_be32(1);
2435         }
2436         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2437                 p = xdr_reserve_space(xdr, 4);
2438                 if (!p)
2439                         goto out_resource;
2440                 *p++ = cpu_to_be32(stat.nlink);
2441         }
2442         if (bmval1 & FATTR4_WORD1_OWNER) {
2443                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2444                 if (status)
2445                         goto out;
2446         }
2447         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2448                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2449                 if (status)
2450                         goto out;
2451         }
2452         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2453                 p = xdr_reserve_space(xdr, 8);
2454                 if (!p)
2455                         goto out_resource;
2456                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2457                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2458         }
2459         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2460                 p = xdr_reserve_space(xdr, 8);
2461                 if (!p)
2462                         goto out_resource;
2463                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2464                 p = xdr_encode_hyper(p, dummy64);
2465         }
2466         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2467                 p = xdr_reserve_space(xdr, 8);
2468                 if (!p)
2469                         goto out_resource;
2470                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2471                 p = xdr_encode_hyper(p, dummy64);
2472         }
2473         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2474                 p = xdr_reserve_space(xdr, 8);
2475                 if (!p)
2476                         goto out_resource;
2477                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2478                 p = xdr_encode_hyper(p, dummy64);
2479         }
2480         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2481                 p = xdr_reserve_space(xdr, 8);
2482                 if (!p)
2483                         goto out_resource;
2484                 dummy64 = (u64)stat.blocks << 9;
2485                 p = xdr_encode_hyper(p, dummy64);
2486         }
2487         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2488                 p = xdr_reserve_space(xdr, 12);
2489                 if (!p)
2490                         goto out_resource;
2491                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2492                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2493         }
2494         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2495                 p = xdr_reserve_space(xdr, 12);
2496                 if (!p)
2497                         goto out_resource;
2498                 *p++ = cpu_to_be32(0);
2499                 *p++ = cpu_to_be32(1);
2500                 *p++ = cpu_to_be32(0);
2501         }
2502         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2503                 p = xdr_reserve_space(xdr, 12);
2504                 if (!p)
2505                         goto out_resource;
2506                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2507                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2508         }
2509         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2510                 p = xdr_reserve_space(xdr, 12);
2511                 if (!p)
2512                         goto out_resource;
2513                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2514                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2515         }
2516         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2517                 p = xdr_reserve_space(xdr, 8);
2518                 if (!p)
2519                         goto out_resource;
2520                 /*
2521                  * Get parent's attributes if not ignoring crossmount
2522                  * and this is the root of a cross-mounted filesystem.
2523                  */
2524                 if (ignore_crossmnt == 0 &&
2525                     dentry == exp->ex_path.mnt->mnt_root)
2526                         get_parent_attributes(exp, &stat);
2527                 p = xdr_encode_hyper(p, stat.ino);
2528         }
2529         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2530                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2531                                                                 contextlen);
2532                 if (status)
2533                         goto out;
2534         }
2535         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2536                 p = xdr_reserve_space(xdr, 16);
2537                 if (!p)
2538                         goto out_resource;
2539                 *p++ = cpu_to_be32(3);
2540                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2541                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2542                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2543         }
2544
2545         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2546         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2547         status = nfs_ok;
2548
2549 out:
2550 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2551         if (context)
2552                 security_release_secctx(context, contextlen);
2553 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2554         kfree(acl);
2555         if (tempfh) {
2556                 fh_put(tempfh);
2557                 kfree(tempfh);
2558         }
2559         if (status)
2560                 xdr_truncate_encode(xdr, starting_len);
2561         return status;
2562 out_nfserr:
2563         status = nfserrno(err);
2564         goto out;
2565 out_resource:
2566         status = nfserr_resource;
2567         goto out;
2568 }
2569
2570 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2571                                 struct xdr_buf *buf, __be32 *p, int bytes)
2572 {
2573         xdr->scratch.iov_len = 0;
2574         memset(buf, 0, sizeof(struct xdr_buf));
2575         buf->head[0].iov_base = p;
2576         buf->head[0].iov_len = 0;
2577         buf->len = 0;
2578         xdr->buf = buf;
2579         xdr->iov = buf->head;
2580         xdr->p = p;
2581         xdr->end = (void *)p + bytes;
2582         buf->buflen = bytes;
2583 }
2584
2585 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2586                         struct svc_fh *fhp, struct svc_export *exp,
2587                         struct dentry *dentry, u32 *bmval,
2588                         struct svc_rqst *rqstp, int ignore_crossmnt)
2589 {
2590         struct xdr_buf dummy;
2591         struct xdr_stream xdr;
2592         __be32 ret;
2593
2594         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2595         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2596                                                         ignore_crossmnt);
2597         *p = xdr.p;
2598         return ret;
2599 }
2600
2601 static inline int attributes_need_mount(u32 *bmval)
2602 {
2603         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2604                 return 1;
2605         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2606                 return 1;
2607         return 0;
2608 }
2609
2610 static __be32
2611 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2612                         const char *name, int namlen)
2613 {
2614         struct svc_export *exp = cd->rd_fhp->fh_export;
2615         struct dentry *dentry;
2616         __be32 nfserr;
2617         int ignore_crossmnt = 0;
2618
2619         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2620         if (IS_ERR(dentry))
2621                 return nfserrno(PTR_ERR(dentry));
2622         if (!dentry->d_inode) {
2623                 /*
2624                  * nfsd_buffered_readdir drops the i_mutex between
2625                  * readdir and calling this callback, leaving a window
2626                  * where this directory entry could have gone away.
2627                  */
2628                 dput(dentry);
2629                 return nfserr_noent;
2630         }
2631
2632         exp_get(exp);
2633         /*
2634          * In the case of a mountpoint, the client may be asking for
2635          * attributes that are only properties of the underlying filesystem
2636          * as opposed to the cross-mounted file system. In such a case,
2637          * we will not follow the cross mount and will fill the attribtutes
2638          * directly from the mountpoint dentry.
2639          */
2640         if (nfsd_mountpoint(dentry, exp)) {
2641                 int err;
2642
2643                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2644                                 && !attributes_need_mount(cd->rd_bmval)) {
2645                         ignore_crossmnt = 1;
2646                         goto out_encode;
2647                 }
2648                 /*
2649                  * Why the heck aren't we just using nfsd_lookup??
2650                  * Different "."/".." handling?  Something else?
2651                  * At least, add a comment here to explain....
2652                  */
2653                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2654                 if (err) {
2655                         nfserr = nfserrno(err);
2656                         goto out_put;
2657                 }
2658                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2659                 if (nfserr)
2660                         goto out_put;
2661
2662         }
2663 out_encode:
2664         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2665                                         cd->rd_rqstp, ignore_crossmnt);
2666 out_put:
2667         dput(dentry);
2668         exp_put(exp);
2669         return nfserr;
2670 }
2671
2672 static __be32 *
2673 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2674 {
2675         __be32 *p;
2676
2677         p = xdr_reserve_space(xdr, 20);
2678         if (!p)
2679                 return NULL;
2680         *p++ = htonl(2);
2681         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2682         *p++ = htonl(0);                         /* bmval1 */
2683
2684         *p++ = htonl(4);     /* attribute length */
2685         *p++ = nfserr;       /* no htonl */
2686         return p;
2687 }
2688
2689 static int
2690 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2691                     loff_t offset, u64 ino, unsigned int d_type)
2692 {
2693         struct readdir_cd *ccd = ccdv;
2694         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2695         struct xdr_stream *xdr = cd->xdr;
2696         int start_offset = xdr->buf->len;
2697         int cookie_offset;
2698         u32 name_and_cookie;
2699         int entry_bytes;
2700         __be32 nfserr = nfserr_toosmall;
2701         __be64 wire_offset;
2702         __be32 *p;
2703
2704         /* In nfsv4, "." and ".." never make it onto the wire.. */
2705         if (name && isdotent(name, namlen)) {
2706                 cd->common.err = nfs_ok;
2707                 return 0;
2708         }
2709
2710         if (cd->cookie_offset) {
2711                 wire_offset = cpu_to_be64(offset);
2712                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2713                                                         &wire_offset, 8);
2714         }
2715
2716         p = xdr_reserve_space(xdr, 4);
2717         if (!p)
2718                 goto fail;
2719         *p++ = xdr_one;                             /* mark entry present */
2720         cookie_offset = xdr->buf->len;
2721         p = xdr_reserve_space(xdr, 3*4 + namlen);
2722         if (!p)
2723                 goto fail;
2724         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2725         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2726
2727         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2728         switch (nfserr) {
2729         case nfs_ok:
2730                 break;
2731         case nfserr_resource:
2732                 nfserr = nfserr_toosmall;
2733                 goto fail;
2734         case nfserr_noent:
2735                 xdr_truncate_encode(xdr, start_offset);
2736                 goto skip_entry;
2737         default:
2738                 /*
2739                  * If the client requested the RDATTR_ERROR attribute,
2740                  * we stuff the error code into this attribute
2741                  * and continue.  If this attribute was not requested,
2742                  * then in accordance with the spec, we fail the
2743                  * entire READDIR operation(!)
2744                  */
2745                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2746                         goto fail;
2747                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2748                 if (p == NULL) {
2749                         nfserr = nfserr_toosmall;
2750                         goto fail;
2751                 }
2752         }
2753         nfserr = nfserr_toosmall;
2754         entry_bytes = xdr->buf->len - start_offset;
2755         if (entry_bytes > cd->rd_maxcount)
2756                 goto fail;
2757         cd->rd_maxcount -= entry_bytes;
2758         if (!cd->rd_dircount)
2759                 goto fail;
2760         /*
2761          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
2762          * let's always let through the first entry, at least:
2763          */
2764         name_and_cookie = 4 * XDR_QUADLEN(namlen) + 8;
2765         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
2766                 goto fail;
2767         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
2768         cd->cookie_offset = cookie_offset;
2769 skip_entry:
2770         cd->common.err = nfs_ok;
2771         return 0;
2772 fail:
2773         xdr_truncate_encode(xdr, start_offset);
2774         cd->common.err = nfserr;
2775         return -EINVAL;
2776 }
2777
2778 static __be32
2779 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2780 {
2781         __be32 *p;
2782
2783         p = xdr_reserve_space(xdr, sizeof(stateid_t));
2784         if (!p)
2785                 return nfserr_resource;
2786         *p++ = cpu_to_be32(sid->si_generation);
2787         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
2788                                         sizeof(stateid_opaque_t));
2789         return 0;
2790 }
2791
2792 static __be32
2793 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2794 {
2795         struct xdr_stream *xdr = &resp->xdr;
2796         __be32 *p;
2797
2798         if (!nfserr) {
2799                 p = xdr_reserve_space(xdr, 8);
2800                 if (!p)
2801                         return nfserr_resource;
2802                 *p++ = cpu_to_be32(access->ac_supported);
2803                 *p++ = cpu_to_be32(access->ac_resp_access);
2804         }
2805         return nfserr;
2806 }
2807
2808 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2809 {
2810         struct xdr_stream *xdr = &resp->xdr;
2811         __be32 *p;
2812
2813         if (!nfserr) {
2814                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
2815                 if (!p)
2816                         return nfserr_resource;
2817                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
2818                                                 NFS4_MAX_SESSIONID_LEN);
2819                 *p++ = cpu_to_be32(bcts->dir);
2820                 /* Sorry, we do not yet support RDMA over 4.1: */
2821                 *p++ = cpu_to_be32(0);
2822         }
2823         return nfserr;
2824 }
2825
2826 static __be32
2827 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2828 {
2829         struct xdr_stream *xdr = &resp->xdr;
2830
2831         if (!nfserr)
2832                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2833
2834         return nfserr;
2835 }
2836
2837
2838 static __be32
2839 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2840 {
2841         struct xdr_stream *xdr = &resp->xdr;
2842         __be32 *p;
2843
2844         if (!nfserr) {
2845                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
2846                 if (!p)
2847                         return nfserr_resource;
2848                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
2849                                                 NFS4_VERIFIER_SIZE);
2850         }
2851         return nfserr;
2852 }
2853
2854 static __be32
2855 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2856 {
2857         struct xdr_stream *xdr = &resp->xdr;
2858         __be32 *p;
2859
2860         if (!nfserr) {
2861                 p = xdr_reserve_space(xdr, 32);
2862                 if (!p)
2863                         return nfserr_resource;
2864                 p = encode_cinfo(p, &create->cr_cinfo);
2865                 *p++ = cpu_to_be32(2);
2866                 *p++ = cpu_to_be32(create->cr_bmval[0]);
2867                 *p++ = cpu_to_be32(create->cr_bmval[1]);
2868         }
2869         return nfserr;
2870 }
2871
2872 static __be32
2873 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2874 {
2875         struct svc_fh *fhp = getattr->ga_fhp;
2876         struct xdr_stream *xdr = &resp->xdr;
2877
2878         if (nfserr)
2879                 return nfserr;
2880
2881         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
2882                                     getattr->ga_bmval,
2883                                     resp->rqstp, 0);
2884         return nfserr;
2885 }
2886
2887 static __be32
2888 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2889 {
2890         struct xdr_stream *xdr = &resp->xdr;
2891         struct svc_fh *fhp = *fhpp;
2892         unsigned int len;
2893         __be32 *p;
2894
2895         if (!nfserr) {
2896                 len = fhp->fh_handle.fh_size;
2897                 p = xdr_reserve_space(xdr, len + 4);
2898                 if (!p)
2899                         return nfserr_resource;
2900                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
2901         }
2902         return nfserr;
2903 }
2904
2905 /*
2906 * Including all fields other than the name, a LOCK4denied structure requires
2907 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2908 */
2909 static __be32
2910 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
2911 {
2912         struct xdr_netobj *conf = &ld->ld_owner;
2913         __be32 *p;
2914
2915 again:
2916         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2917         if (!p) {
2918                 /*
2919                  * Don't fail to return the result just because we can't
2920                  * return the conflicting open:
2921                  */
2922                 if (conf->len) {
2923                         kfree(conf->data);
2924                         conf->len = 0;
2925                         conf->data = NULL;
2926                         goto again;
2927                 }
2928                 return nfserr_resource;
2929         }
2930         p = xdr_encode_hyper(p, ld->ld_start);
2931         p = xdr_encode_hyper(p, ld->ld_length);
2932         *p++ = cpu_to_be32(ld->ld_type);
2933         if (conf->len) {
2934                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
2935                 p = xdr_encode_opaque(p, conf->data, conf->len);
2936                 kfree(conf->data);
2937         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2938                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
2939                 *p++ = cpu_to_be32(0); /* length of owner name */
2940         }
2941         return nfserr_denied;
2942 }
2943
2944 static __be32
2945 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2946 {
2947         struct xdr_stream *xdr = &resp->xdr;
2948
2949         if (!nfserr)
2950                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2951         else if (nfserr == nfserr_denied)
2952                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2953
2954         return nfserr;
2955 }
2956
2957 static __be32
2958 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2959 {
2960         struct xdr_stream *xdr = &resp->xdr;
2961
2962         if (nfserr == nfserr_denied)
2963                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2964         return nfserr;
2965 }
2966
2967 static __be32
2968 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2969 {
2970         struct xdr_stream *xdr = &resp->xdr;
2971
2972         if (!nfserr)
2973                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2974
2975         return nfserr;
2976 }
2977
2978
2979 static __be32
2980 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2981 {
2982         struct xdr_stream *xdr = &resp->xdr;
2983         __be32 *p;
2984
2985         if (!nfserr) {
2986                 p = xdr_reserve_space(xdr, 20);
2987                 if (!p)
2988                         return nfserr_resource;
2989                 p = encode_cinfo(p, &link->li_cinfo);
2990         }
2991         return nfserr;
2992 }
2993
2994
2995 static __be32
2996 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2997 {
2998         struct xdr_stream *xdr = &resp->xdr;
2999         __be32 *p;
3000
3001         if (nfserr)
3002                 goto out;
3003
3004         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3005         if (nfserr)
3006                 goto out;
3007         p = xdr_reserve_space(xdr, 40);
3008         if (!p)
3009                 return nfserr_resource;
3010         p = encode_cinfo(p, &open->op_cinfo);
3011         *p++ = cpu_to_be32(open->op_rflags);
3012         *p++ = cpu_to_be32(2);
3013         *p++ = cpu_to_be32(open->op_bmval[0]);
3014         *p++ = cpu_to_be32(open->op_bmval[1]);
3015         *p++ = cpu_to_be32(open->op_delegate_type);
3016
3017         switch (open->op_delegate_type) {
3018         case NFS4_OPEN_DELEGATE_NONE:
3019                 break;
3020         case NFS4_OPEN_DELEGATE_READ:
3021                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3022                 if (nfserr)
3023                         return nfserr;
3024                 p = xdr_reserve_space(xdr, 20);
3025                 if (!p)
3026                         return nfserr_resource;
3027                 *p++ = cpu_to_be32(open->op_recall);
3028
3029                 /*
3030                  * TODO: ACE's in delegations
3031                  */
3032                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3033                 *p++ = cpu_to_be32(0);
3034                 *p++ = cpu_to_be32(0);
3035                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3036                 break;
3037         case NFS4_OPEN_DELEGATE_WRITE:
3038                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3039                 if (nfserr)
3040                         return nfserr;
3041                 p = xdr_reserve_space(xdr, 32);
3042                 if (!p)
3043                         return nfserr_resource;
3044                 *p++ = cpu_to_be32(0);
3045
3046                 /*
3047                  * TODO: space_limit's in delegations
3048                  */
3049                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3050                 *p++ = cpu_to_be32(~(u32)0);
3051                 *p++ = cpu_to_be32(~(u32)0);
3052
3053                 /*
3054                  * TODO: ACE's in delegations
3055                  */
3056                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3057                 *p++ = cpu_to_be32(0);
3058                 *p++ = cpu_to_be32(0);
3059                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3060                 break;
3061         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3062                 switch (open->op_why_no_deleg) {
3063                 case WND4_CONTENTION:
3064                 case WND4_RESOURCE:
3065                         p = xdr_reserve_space(xdr, 8);
3066                         if (!p)
3067                                 return nfserr_resource;
3068                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3069                         /* deleg signaling not supported yet: */
3070                         *p++ = cpu_to_be32(0);
3071                         break;
3072                 default:
3073                         p = xdr_reserve_space(xdr, 4);
3074                         if (!p)
3075                                 return nfserr_resource;
3076                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3077                 }
3078                 break;
3079         default:
3080                 BUG();
3081         }
3082         /* XXX save filehandle here */
3083 out:
3084         return nfserr;
3085 }
3086
3087 static __be32
3088 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3089 {
3090         struct xdr_stream *xdr = &resp->xdr;
3091
3092         if (!nfserr)
3093                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3094
3095         return nfserr;
3096 }
3097
3098 static __be32
3099 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3100 {
3101         struct xdr_stream *xdr = &resp->xdr;
3102
3103         if (!nfserr)
3104                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3105
3106         return nfserr;
3107 }
3108
3109 static __be32 nfsd4_encode_splice_read(
3110                                 struct nfsd4_compoundres *resp,
3111                                 struct nfsd4_read *read,
3112                                 struct file *file, unsigned long maxcount)
3113 {
3114         struct xdr_stream *xdr = &resp->xdr;
3115         struct xdr_buf *buf = xdr->buf;
3116         u32 eof;
3117         int space_left;
3118         __be32 nfserr;
3119         __be32 *p = xdr->p - 2;
3120
3121         /* Make sure there will be room for padding if needed */
3122         if (xdr->end - xdr->p < 1)
3123                 return nfserr_resource;
3124
3125         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3126                                   read->rd_offset, &maxcount);
3127         if (nfserr) {
3128                 /*
3129                  * nfsd_splice_actor may have already messed with the
3130                  * page length; reset it so as not to confuse
3131                  * xdr_truncate_encode:
3132                  */
3133                 buf->page_len = 0;
3134                 return nfserr;
3135         }
3136
3137         eof = (read->rd_offset + maxcount >=
3138                read->rd_fhp->fh_dentry->d_inode->i_size);
3139
3140         *(p++) = htonl(eof);
3141         *(p++) = htonl(maxcount);
3142
3143         buf->page_len = maxcount;
3144         buf->len += maxcount;
3145         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3146                                                         / PAGE_SIZE;
3147
3148         /* Use rest of head for padding and remaining ops: */
3149         buf->tail[0].iov_base = xdr->p;
3150         buf->tail[0].iov_len = 0;
3151         xdr->iov = buf->tail;
3152         if (maxcount&3) {
3153                 int pad = 4 - (maxcount&3);
3154
3155                 *(xdr->p++) = 0;
3156
3157                 buf->tail[0].iov_base += maxcount&3;
3158                 buf->tail[0].iov_len = pad;
3159                 buf->len += pad;
3160         }
3161
3162         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3163                                 buf->buflen - buf->len);
3164         buf->buflen = buf->len + space_left;
3165         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3166
3167         return 0;
3168 }
3169
3170 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3171                                  struct nfsd4_read *read,
3172                                  struct file *file, unsigned long maxcount)
3173 {
3174         struct xdr_stream *xdr = &resp->xdr;
3175         u32 eof;
3176         int v;
3177         int starting_len = xdr->buf->len - 8;
3178         long len;
3179         int thislen;
3180         __be32 nfserr;
3181         __be32 tmp;
3182         __be32 *p;
3183         u32 zzz = 0;
3184         int pad;
3185
3186         len = maxcount;
3187         v = 0;
3188
3189         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3190         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3191         WARN_ON_ONCE(!p);
3192         resp->rqstp->rq_vec[v].iov_base = p;
3193         resp->rqstp->rq_vec[v].iov_len = thislen;
3194         v++;
3195         len -= thislen;
3196
3197         while (len) {
3198                 thislen = min_t(long, len, PAGE_SIZE);
3199                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3200                 WARN_ON_ONCE(!p);
3201                 resp->rqstp->rq_vec[v].iov_base = p;
3202                 resp->rqstp->rq_vec[v].iov_len = thislen;
3203                 v++;
3204                 len -= thislen;
3205         }
3206         read->rd_vlen = v;
3207
3208         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3209                         read->rd_vlen, &maxcount);
3210         if (nfserr)
3211                 return nfserr;
3212         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3213
3214         eof = (read->rd_offset + maxcount >=
3215                read->rd_fhp->fh_dentry->d_inode->i_size);
3216
3217         tmp = htonl(eof);
3218         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3219         tmp = htonl(maxcount);
3220         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3221
3222         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3223         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3224                                                                 &zzz, pad);
3225         return 0;
3226
3227 }
3228
3229 static __be32
3230 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3231                   struct nfsd4_read *read)
3232 {
3233         unsigned long maxcount;
3234         struct xdr_stream *xdr = &resp->xdr;
3235         struct file *file = read->rd_filp;
3236         struct svc_fh *fhp = read->rd_fhp;
3237         int starting_len = xdr->buf->len;
3238         struct raparms *ra;
3239         __be32 *p;
3240         __be32 err;
3241
3242         if (nfserr)
3243                 return nfserr;
3244
3245         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3246         if (!p) {
3247                 WARN_ON_ONCE(resp->rqstp->rq_splice_ok);
3248                 return nfserr_resource;
3249         }
3250         if (resp->xdr.buf->page_len && resp->rqstp->rq_splice_ok) {
3251                 WARN_ON_ONCE(1);
3252                 return nfserr_resource;
3253         }
3254         xdr_commit_encode(xdr);
3255
3256         maxcount = svc_max_payload(resp->rqstp);
3257         maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len));
3258         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3259
3260         if (read->rd_filp)
3261                 err = nfsd_permission(resp->rqstp, fhp->fh_export,
3262                                 fhp->fh_dentry,
3263                                 NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE);
3264         else
3265                 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
3266                                                 &file, &ra);
3267         if (err)
3268                 goto err_truncate;
3269
3270         if (file->f_op->splice_read && resp->rqstp->rq_splice_ok)
3271                 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
3272         else
3273                 err = nfsd4_encode_readv(resp, read, file, maxcount);
3274
3275         if (!read->rd_filp)
3276                 nfsd_put_tmp_read_open(file, ra);
3277
3278 err_truncate:
3279         if (err)
3280                 xdr_truncate_encode(xdr, starting_len);
3281         return err;
3282 }
3283
3284 static __be32
3285 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3286 {
3287         int maxcount;
3288         __be32 wire_count;
3289         int zero = 0;
3290         struct xdr_stream *xdr = &resp->xdr;
3291         int length_offset = xdr->buf->len;
3292         __be32 *p;
3293
3294         if (nfserr)
3295                 return nfserr;
3296
3297         p = xdr_reserve_space(xdr, 4);
3298         if (!p)
3299                 return nfserr_resource;
3300         maxcount = PAGE_SIZE;
3301
3302         p = xdr_reserve_space(xdr, maxcount);
3303         if (!p)
3304                 return nfserr_resource;
3305         /*
3306          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3307          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3308          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3309          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3310          */
3311         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3312                                                 (char *)p, &maxcount);
3313         if (nfserr == nfserr_isdir)
3314                 nfserr = nfserr_inval;
3315         if (nfserr) {
3316                 xdr_truncate_encode(xdr, length_offset);
3317                 return nfserr;
3318         }
3319
3320         wire_count = htonl(maxcount);
3321         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3322         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3323         if (maxcount & 3)
3324                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3325                                                 &zero, 4 - (maxcount&3));
3326         return 0;
3327 }
3328
3329 static __be32
3330 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3331 {
3332         int maxcount;
3333         int bytes_left;
3334         loff_t offset;
3335         __be64 wire_offset;
3336         struct xdr_stream *xdr = &resp->xdr;
3337         int starting_len = xdr->buf->len;
3338         __be32 *p;
3339
3340         if (nfserr)
3341                 return nfserr;
3342
3343         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3344         if (!p)
3345                 return nfserr_resource;
3346
3347         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3348         *p++ = cpu_to_be32(0);
3349         *p++ = cpu_to_be32(0);
3350         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3351                                 - (char *)resp->xdr.buf->head[0].iov_base;
3352
3353         /*
3354          * Number of bytes left for directory entries allowing for the
3355          * final 8 bytes of the readdir and a following failed op:
3356          */
3357         bytes_left = xdr->buf->buflen - xdr->buf->len
3358                         - COMPOUND_ERR_SLACK_SPACE - 8;
3359         if (bytes_left < 0) {
3360                 nfserr = nfserr_resource;
3361                 goto err_no_verf;
3362         }
3363         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3364         /*
3365          * Note the rfc defines rd_maxcount as the size of the
3366          * READDIR4resok structure, which includes the verifier above
3367          * and the 8 bytes encoded at the end of this function:
3368          */
3369         if (maxcount < 16) {
3370                 nfserr = nfserr_toosmall;
3371                 goto err_no_verf;
3372         }
3373         maxcount = min_t(int, maxcount-16, bytes_left);
3374
3375         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3376         if (!readdir->rd_dircount)
3377                 readdir->rd_dircount = INT_MAX;
3378
3379         readdir->xdr = xdr;
3380         readdir->rd_maxcount = maxcount;
3381         readdir->common.err = 0;
3382         readdir->cookie_offset = 0;
3383
3384         offset = readdir->rd_cookie;
3385         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3386                               &offset,
3387                               &readdir->common, nfsd4_encode_dirent);
3388         if (nfserr == nfs_ok &&
3389             readdir->common.err == nfserr_toosmall &&
3390             xdr->buf->len == starting_len + 8) {
3391                 /* nothing encoded; which limit did we hit?: */
3392                 if (maxcount - 16 < bytes_left)
3393                         /* It was the fault of rd_maxcount: */
3394                         nfserr = nfserr_toosmall;
3395                 else
3396                         /* We ran out of buffer space: */
3397                         nfserr = nfserr_resource;
3398         }
3399         if (nfserr)
3400                 goto err_no_verf;
3401
3402         if (readdir->cookie_offset) {
3403                 wire_offset = cpu_to_be64(offset);
3404                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3405                                                         &wire_offset, 8);
3406         }
3407
3408         p = xdr_reserve_space(xdr, 8);
3409         if (!p) {
3410                 WARN_ON_ONCE(1);
3411                 goto err_no_verf;
3412         }
3413         *p++ = 0;       /* no more entries */
3414         *p++ = htonl(readdir->common.err == nfserr_eof);
3415
3416         return 0;
3417 err_no_verf:
3418         xdr_truncate_encode(xdr, starting_len);
3419         return nfserr;
3420 }
3421
3422 static __be32
3423 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3424 {
3425         struct xdr_stream *xdr = &resp->xdr;
3426         __be32 *p;
3427
3428         if (!nfserr) {
3429                 p = xdr_reserve_space(xdr, 20);
3430                 if (!p)
3431                         return nfserr_resource;
3432                 p = encode_cinfo(p, &remove->rm_cinfo);
3433         }
3434         return nfserr;
3435 }
3436
3437 static __be32
3438 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3439 {
3440         struct xdr_stream *xdr = &resp->xdr;
3441         __be32 *p;
3442
3443         if (!nfserr) {
3444                 p = xdr_reserve_space(xdr, 40);
3445                 if (!p)
3446                         return nfserr_resource;
3447                 p = encode_cinfo(p, &rename->rn_sinfo);
3448                 p = encode_cinfo(p, &rename->rn_tinfo);
3449         }
3450         return nfserr;
3451 }
3452
3453 static __be32
3454 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3455                          __be32 nfserr, struct svc_export *exp)
3456 {
3457         u32 i, nflavs, supported;
3458         struct exp_flavor_info *flavs;
3459         struct exp_flavor_info def_flavs[2];
3460         __be32 *p, *flavorsp;
3461         static bool report = true;
3462
3463         if (nfserr)
3464                 goto out;
3465         nfserr = nfserr_resource;
3466         if (exp->ex_nflavors) {
3467                 flavs = exp->ex_flavors;
3468                 nflavs = exp->ex_nflavors;
3469         } else { /* Handling of some defaults in absence of real secinfo: */
3470                 flavs = def_flavs;
3471                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3472                         nflavs = 2;
3473                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3474                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3475                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3476                         nflavs = 1;
3477                         flavs[0].pseudoflavor
3478                                         = svcauth_gss_flavor(exp->ex_client);
3479                 } else {
3480                         nflavs = 1;
3481                         flavs[0].pseudoflavor
3482                                         = exp->ex_client->flavour->flavour;
3483                 }
3484         }
3485
3486         supported = 0;
3487         p = xdr_reserve_space(xdr, 4);
3488         if (!p)
3489                 goto out;
3490         flavorsp = p++;         /* to be backfilled later */
3491
3492         for (i = 0; i < nflavs; i++) {
3493                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3494                 struct rpcsec_gss_info info;
3495
3496                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3497                         supported++;
3498                         p = xdr_reserve_space(xdr, 4 + 4 +
3499                                               XDR_LEN(info.oid.len) + 4 + 4);
3500                         if (!p)
3501                                 goto out;
3502                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3503                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3504                         *p++ = cpu_to_be32(info.qop);
3505                         *p++ = cpu_to_be32(info.service);
3506                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3507                         supported++;
3508                         p = xdr_reserve_space(xdr, 4);
3509                         if (!p)
3510                                 goto out;
3511                         *p++ = cpu_to_be32(pf);
3512                 } else {
3513                         if (report)
3514                                 pr_warn("NFS: SECINFO: security flavor %u "
3515                                         "is not supported\n", pf);
3516                 }
3517         }
3518
3519         if (nflavs != supported)
3520                 report = false;
3521         *flavorsp = htonl(supported);
3522         nfserr = 0;
3523 out:
3524         if (exp)
3525                 exp_put(exp);
3526         return nfserr;
3527 }
3528
3529 static __be32
3530 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3531                      struct nfsd4_secinfo *secinfo)
3532 {
3533         struct xdr_stream *xdr = &resp->xdr;
3534
3535         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3536 }
3537
3538 static __be32
3539 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3540                      struct nfsd4_secinfo_no_name *secinfo)
3541 {
3542         struct xdr_stream *xdr = &resp->xdr;
3543
3544         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3545 }
3546
3547 /*
3548  * The SETATTR encode routine is special -- it always encodes a bitmap,
3549  * regardless of the error status.
3550  */
3551 static __be32
3552 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3553 {
3554         struct xdr_stream *xdr = &resp->xdr;
3555         __be32 *p;
3556
3557         p = xdr_reserve_space(xdr, 16);
3558         if (!p)
3559                 return nfserr_resource;
3560         if (nfserr) {
3561                 *p++ = cpu_to_be32(3);
3562                 *p++ = cpu_to_be32(0);
3563                 *p++ = cpu_to_be32(0);
3564                 *p++ = cpu_to_be32(0);
3565         }
3566         else {
3567                 *p++ = cpu_to_be32(3);
3568                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3569                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3570                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3571         }
3572         return nfserr;
3573 }
3574
3575 static __be32
3576 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3577 {
3578         struct xdr_stream *xdr = &resp->xdr;
3579         __be32 *p;
3580
3581         if (!nfserr) {
3582                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3583                 if (!p)
3584                         return nfserr_resource;
3585                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3586                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3587                                                 NFS4_VERIFIER_SIZE);
3588         }
3589         else if (nfserr == nfserr_clid_inuse) {
3590                 p = xdr_reserve_space(xdr, 8);
3591                 if (!p)
3592                         return nfserr_resource;
3593                 *p++ = cpu_to_be32(0);
3594                 *p++ = cpu_to_be32(0);
3595         }
3596         return nfserr;
3597 }
3598
3599 static __be32
3600 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3601 {
3602         struct xdr_stream *xdr = &resp->xdr;
3603         __be32 *p;
3604
3605         if (!nfserr) {
3606                 p = xdr_reserve_space(xdr, 16);
3607                 if (!p)
3608                         return nfserr_resource;
3609                 *p++ = cpu_to_be32(write->wr_bytes_written);
3610                 *p++ = cpu_to_be32(write->wr_how_written);
3611                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3612                                                         NFS4_VERIFIER_SIZE);
3613         }
3614         return nfserr;
3615 }
3616
3617 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3618         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3619               1 << (OP_EXCHANGE_ID - 32) |
3620               1 << (OP_CREATE_SESSION - 32) |
3621               1 << (OP_DESTROY_SESSION - 32) |
3622               1 << (OP_DESTROY_CLIENTID - 32)
3623 };
3624
3625 static __be32
3626 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3627                          struct nfsd4_exchange_id *exid)
3628 {
3629         struct xdr_stream *xdr = &resp->xdr;
3630         __be32 *p;
3631         char *major_id;
3632         char *server_scope;
3633         int major_id_sz;
3634         int server_scope_sz;
3635         uint64_t minor_id = 0;
3636
3637         if (nfserr)
3638                 return nfserr;
3639
3640         major_id = utsname()->nodename;
3641         major_id_sz = strlen(major_id);
3642         server_scope = utsname()->nodename;
3643         server_scope_sz = strlen(server_scope);
3644
3645         p = xdr_reserve_space(xdr,
3646                 8 /* eir_clientid */ +
3647                 4 /* eir_sequenceid */ +
3648                 4 /* eir_flags */ +
3649                 4 /* spr_how */);
3650         if (!p)
3651                 return nfserr_resource;
3652
3653         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3654         *p++ = cpu_to_be32(exid->seqid);
3655         *p++ = cpu_to_be32(exid->flags);
3656
3657         *p++ = cpu_to_be32(exid->spa_how);
3658
3659         switch (exid->spa_how) {
3660         case SP4_NONE:
3661                 break;
3662         case SP4_MACH_CRED:
3663                 /* spo_must_enforce, spo_must_allow */
3664                 p = xdr_reserve_space(xdr, 16);
3665                 if (!p)
3666                         return nfserr_resource;
3667
3668                 /* spo_must_enforce bitmap: */
3669                 *p++ = cpu_to_be32(2);
3670                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3671                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3672                 /* empty spo_must_allow bitmap: */
3673                 *p++ = cpu_to_be32(0);
3674
3675                 break;
3676         default:
3677                 WARN_ON_ONCE(1);
3678         }
3679
3680         p = xdr_reserve_space(xdr,
3681                 8 /* so_minor_id */ +
3682                 4 /* so_major_id.len */ +
3683                 (XDR_QUADLEN(major_id_sz) * 4) +
3684                 4 /* eir_server_scope.len */ +
3685                 (XDR_QUADLEN(server_scope_sz) * 4) +
3686                 4 /* eir_server_impl_id.count (0) */);
3687         if (!p)
3688                 return nfserr_resource;
3689
3690         /* The server_owner struct */
3691         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3692         /* major id */
3693         p = xdr_encode_opaque(p, major_id, major_id_sz);
3694
3695         /* Server scope */
3696         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3697
3698         /* Implementation id */
3699         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3700         return 0;
3701 }
3702
3703 static __be32
3704 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3705                             struct nfsd4_create_session *sess)
3706 {
3707         struct xdr_stream *xdr = &resp->xdr;
3708         __be32 *p;
3709
3710         if (nfserr)
3711                 return nfserr;
3712
3713         p = xdr_reserve_space(xdr, 24);
3714         if (!p)
3715                 return nfserr_resource;
3716         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3717                                         NFS4_MAX_SESSIONID_LEN);
3718         *p++ = cpu_to_be32(sess->seqid);
3719         *p++ = cpu_to_be32(sess->flags);
3720
3721         p = xdr_reserve_space(xdr, 28);
3722         if (!p)
3723                 return nfserr_resource;
3724         *p++ = cpu_to_be32(0); /* headerpadsz */
3725         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3726         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3727         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3728         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3729         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3730         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3731
3732         if (sess->fore_channel.nr_rdma_attrs) {
3733                 p = xdr_reserve_space(xdr, 4);
3734                 if (!p)
3735                         return nfserr_resource;
3736                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3737         }
3738
3739         p = xdr_reserve_space(xdr, 28);
3740         if (!p)
3741                 return nfserr_resource;
3742         *p++ = cpu_to_be32(0); /* headerpadsz */
3743         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3744         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3745         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3746         *p++ = cpu_to_be32(sess->back_channel.maxops);
3747         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3748         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3749
3750         if (sess->back_channel.nr_rdma_attrs) {
3751                 p = xdr_reserve_space(xdr, 4);
3752                 if (!p)
3753                         return nfserr_resource;
3754                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3755         }
3756         return 0;
3757 }
3758
3759 static __be32
3760 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3761                       struct nfsd4_sequence *seq)
3762 {
3763         struct xdr_stream *xdr = &resp->xdr;
3764         __be32 *p;
3765
3766         if (nfserr)
3767                 return nfserr;
3768
3769         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3770         if (!p)
3771                 return nfserr_resource;
3772         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
3773                                         NFS4_MAX_SESSIONID_LEN);
3774         *p++ = cpu_to_be32(seq->seqid);
3775         *p++ = cpu_to_be32(seq->slotid);
3776         /* Note slotid's are numbered from zero: */
3777         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
3778         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
3779         *p++ = cpu_to_be32(seq->status_flags);
3780
3781         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3782         return 0;
3783 }
3784
3785 static __be32
3786 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3787                           struct nfsd4_test_stateid *test_stateid)
3788 {
3789         struct xdr_stream *xdr = &resp->xdr;
3790         struct nfsd4_test_stateid_id *stateid, *next;
3791         __be32 *p;
3792
3793         if (nfserr)
3794                 return nfserr;
3795
3796         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3797         if (!p)
3798                 return nfserr_resource;
3799         *p++ = htonl(test_stateid->ts_num_ids);
3800
3801         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3802                 *p++ = stateid->ts_id_status;
3803         }
3804
3805         return nfserr;
3806 }
3807
3808 static __be32
3809 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
3810                   struct nfsd4_seek *seek)
3811 {
3812         __be32 *p;
3813
3814         if (nfserr)
3815                 return nfserr;
3816
3817         p = xdr_reserve_space(&resp->xdr, 4 + 8);
3818         *p++ = cpu_to_be32(seek->seek_eof);
3819         p = xdr_encode_hyper(p, seek->seek_pos);
3820
3821         return nfserr;
3822 }
3823
3824 static __be32
3825 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3826 {
3827         return nfserr;
3828 }
3829
3830 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3831
3832 /*
3833  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3834  * since we don't need to filter out obsolete ops as this is
3835  * done in the decoding phase.
3836  */
3837 static nfsd4_enc nfsd4_enc_ops[] = {
3838         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3839         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3840         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3841         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3842         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3843         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3844         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3845         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3846         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3847         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3848         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3849         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3850         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3851         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3852         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3853         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3854         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3855         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3856         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3857         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3858         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3859         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3860         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3861         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3862         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3863         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3864         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3865         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3866         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3867         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3868         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3869         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3870         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3871         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3872         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3873         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3874         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3875
3876         /* NFSv4.1 operations */
3877         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3878         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3879         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3880         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3881         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
3882         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3883         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3884         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3885         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3886         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3887         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3888         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3889         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3890         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3891         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3892         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3893         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3894         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3895         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3896
3897         /* NFSv4.2 operations */
3898         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
3899         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_noop,
3900         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
3901         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
3902         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
3903         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
3904         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
3905         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
3906         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
3907         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
3908         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
3909         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
3910 };
3911
3912 /*
3913  * Calculate whether we still have space to encode repsize bytes.
3914  * There are two considerations:
3915  *     - For NFS versions >=4.1, the size of the reply must stay within
3916  *       session limits
3917  *     - For all NFS versions, we must stay within limited preallocated
3918  *       buffer space.
3919  *
3920  * This is called before the operation is processed, so can only provide
3921  * an upper estimate.  For some nonidempotent operations (such as
3922  * getattr), it's not necessarily a problem if that estimate is wrong,
3923  * as we can fail it after processing without significant side effects.
3924  */
3925 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
3926 {
3927         struct xdr_buf *buf = &resp->rqstp->rq_res;
3928         struct nfsd4_slot *slot = resp->cstate.slot;
3929
3930         if (buf->len + respsize <= buf->buflen)
3931                 return nfs_ok;
3932         if (!nfsd4_has_session(&resp->cstate))
3933                 return nfserr_resource;
3934         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
3935                 WARN_ON_ONCE(1);
3936                 return nfserr_rep_too_big_to_cache;
3937         }
3938         return nfserr_rep_too_big;
3939 }
3940
3941 void
3942 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3943 {
3944         struct xdr_stream *xdr = &resp->xdr;
3945         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3946         struct svc_rqst *rqstp = resp->rqstp;
3947         int post_err_offset;
3948         nfsd4_enc encoder;
3949         __be32 *p;
3950
3951         p = xdr_reserve_space(xdr, 8);
3952         if (!p) {
3953                 WARN_ON_ONCE(1);
3954                 return;
3955         }
3956         *p++ = cpu_to_be32(op->opnum);
3957         post_err_offset = xdr->buf->len;
3958
3959         if (op->opnum == OP_ILLEGAL)
3960                 goto status;
3961         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3962                !nfsd4_enc_ops[op->opnum]);
3963         encoder = nfsd4_enc_ops[op->opnum];
3964         op->status = encoder(resp, op->status, &op->u);
3965         xdr_commit_encode(xdr);
3966
3967         /* nfsd4_check_resp_size guarantees enough room for error status */
3968         if (!op->status) {
3969                 int space_needed = 0;
3970                 if (!nfsd4_last_compound_op(rqstp))
3971                         space_needed = COMPOUND_ERR_SLACK_SPACE;
3972                 op->status = nfsd4_check_resp_size(resp, space_needed);
3973         }
3974         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
3975                 struct nfsd4_slot *slot = resp->cstate.slot;
3976
3977                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
3978                         op->status = nfserr_rep_too_big_to_cache;
3979                 else
3980                         op->status = nfserr_rep_too_big;
3981         }
3982         if (op->status == nfserr_resource ||
3983             op->status == nfserr_rep_too_big ||
3984             op->status == nfserr_rep_too_big_to_cache) {
3985                 /*
3986                  * The operation may have already been encoded or
3987                  * partially encoded.  No op returns anything additional
3988                  * in the case of one of these three errors, so we can
3989                  * just truncate back to after the status.  But it's a
3990                  * bug if we had to do this on a non-idempotent op:
3991                  */
3992                 warn_on_nonidempotent_op(op);
3993                 xdr_truncate_encode(xdr, post_err_offset);
3994         }
3995         if (so) {
3996                 int len = xdr->buf->len - post_err_offset;
3997
3998                 so->so_replay.rp_status = op->status;
3999                 so->so_replay.rp_buflen = len;
4000                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4001                                                 so->so_replay.rp_buf, len);
4002         }
4003 status:
4004         /* Note that op->status is already in network byte order: */
4005         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4006 }
4007
4008 /*
4009  * Encode the reply stored in the stateowner reply cache
4010  *
4011  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4012  * previously sent already encoded operation.
4013  */
4014 void
4015 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4016 {
4017         __be32 *p;
4018         struct nfs4_replay *rp = op->replay;
4019
4020         BUG_ON(!rp);
4021
4022         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4023         if (!p) {
4024                 WARN_ON_ONCE(1);
4025                 return;
4026         }
4027         *p++ = cpu_to_be32(op->opnum);
4028         *p++ = rp->rp_status;  /* already xdr'ed */
4029
4030         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4031 }
4032
4033 int
4034 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4035 {
4036         return xdr_ressize_check(rqstp, p);
4037 }
4038
4039 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4040 {
4041         struct svc_rqst *rqstp = rq;
4042         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4043
4044         if (args->ops != args->iops) {
4045                 kfree(args->ops);
4046                 args->ops = args->iops;
4047         }
4048         kfree(args->tmpp);
4049         args->tmpp = NULL;
4050         while (args->to_free) {
4051                 struct svcxdr_tmpbuf *tb = args->to_free;
4052                 args->to_free = tb->next;
4053                 kfree(tb);
4054         }
4055         return 1;
4056 }
4057
4058 int
4059 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4060 {
4061         if (rqstp->rq_arg.head[0].iov_len % 4) {
4062                 /* client is nuts */
4063                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4064                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4065                 return 0;
4066         }
4067         args->p = p;
4068         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4069         args->pagelist = rqstp->rq_arg.pages;
4070         args->pagelen = rqstp->rq_arg.page_len;
4071         args->tmpp = NULL;
4072         args->to_free = NULL;
4073         args->ops = args->iops;
4074         args->rqstp = rqstp;
4075
4076         return !nfsd4_decode_compound(args);
4077 }
4078
4079 int
4080 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4081 {
4082         /*
4083          * All that remains is to write the tag and operation count...
4084          */
4085         struct xdr_buf *buf = resp->xdr.buf;
4086
4087         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4088                                  buf->tail[0].iov_len);
4089
4090         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4091
4092         p = resp->tagp;
4093         *p++ = htonl(resp->taglen);
4094         memcpy(p, resp->tag, resp->taglen);
4095         p += XDR_QUADLEN(resp->taglen);
4096         *p++ = htonl(resp->opcnt);
4097
4098         nfsd4_sequence_done(resp);
4099         return 1;
4100 }
4101
4102 /*
4103  * Local variables:
4104  *  c-basic-offset: 8
4105  * End:
4106  */