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 <[email protected]>
   8  *  Andy Adamson   <[email protected]>
   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 + 4);
1065         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1066         rename->rn_tnamelen = be32_to_cpup(p++);
1067         READ_BUF(rename->rn_tnamelen);
1068         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1069         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1070                 return status;
1071         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1072                 return status;
1073
1074         DECODE_TAIL;
1075 }
1076
1077 static __be32
1078 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1079 {
1080         DECODE_HEAD;
1081
1082         if (argp->minorversion >= 1)
1083                 return nfserr_notsupp;
1084
1085         READ_BUF(sizeof(clientid_t));
1086         COPYMEM(clientid, sizeof(clientid_t));
1087
1088         DECODE_TAIL;
1089 }
1090
1091 static __be32
1092 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1093                      struct nfsd4_secinfo *secinfo)
1094 {
1095         DECODE_HEAD;
1096
1097         READ_BUF(4);
1098         secinfo->si_namelen = be32_to_cpup(p++);
1099         READ_BUF(secinfo->si_namelen);
1100         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1101         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1102         if (status)
1103                 return status;
1104         DECODE_TAIL;
1105 }
1106
1107 static __be32
1108 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1109                      struct nfsd4_secinfo_no_name *sin)
1110 {
1111         DECODE_HEAD;
1112
1113         READ_BUF(4);
1114         sin->sin_style = be32_to_cpup(p++);
1115         DECODE_TAIL;
1116 }
1117
1118 static __be32
1119 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1120 {
1121         __be32 status;
1122
1123         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1124         if (status)
1125                 return status;
1126         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1127                                   &setattr->sa_acl, &setattr->sa_label);
1128 }
1129
1130 static __be32
1131 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1132 {
1133         DECODE_HEAD;
1134
1135         if (argp->minorversion >= 1)
1136                 return nfserr_notsupp;
1137
1138         READ_BUF(NFS4_VERIFIER_SIZE);
1139         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1140
1141         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1142         if (status)
1143                 return nfserr_bad_xdr;
1144         READ_BUF(8);
1145         setclientid->se_callback_prog = be32_to_cpup(p++);
1146         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1147
1148         READ_BUF(setclientid->se_callback_netid_len + 4);
1149         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1150         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1151
1152         READ_BUF(setclientid->se_callback_addr_len + 4);
1153         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1154         setclientid->se_callback_ident = be32_to_cpup(p++);
1155
1156         DECODE_TAIL;
1157 }
1158
1159 static __be32
1160 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1161 {
1162         DECODE_HEAD;
1163
1164         if (argp->minorversion >= 1)
1165                 return nfserr_notsupp;
1166
1167         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1168         COPYMEM(&scd_c->sc_clientid, 8);
1169         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1170
1171         DECODE_TAIL;
1172 }
1173
1174 /* Also used for NVERIFY */
1175 static __be32
1176 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1177 {
1178         DECODE_HEAD;
1179
1180         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1181                 goto out;
1182
1183         /* For convenience's sake, we compare raw xdr'd attributes in
1184          * nfsd4_proc_verify */
1185
1186         READ_BUF(4);
1187         verify->ve_attrlen = be32_to_cpup(p++);
1188         READ_BUF(verify->ve_attrlen);
1189         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1190
1191         DECODE_TAIL;
1192 }
1193
1194 static __be32
1195 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1196 {
1197         int avail;
1198         int len;
1199         DECODE_HEAD;
1200
1201         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1202         if (status)
1203                 return status;
1204         READ_BUF(16);
1205         p = xdr_decode_hyper(p, &write->wr_offset);
1206         write->wr_stable_how = be32_to_cpup(p++);
1207         if (write->wr_stable_how > 2)
1208                 goto xdr_error;
1209         write->wr_buflen = be32_to_cpup(p++);
1210
1211         /* Sorry .. no magic macros for this.. *
1212          * READ_BUF(write->wr_buflen);
1213          * SAVEMEM(write->wr_buf, write->wr_buflen);
1214          */
1215         avail = (char*)argp->end - (char*)argp->p;
1216         if (avail + argp->pagelen < write->wr_buflen) {
1217                 dprintk("NFSD: xdr error (%s:%d)\n",
1218                                 __FILE__, __LINE__);
1219                 goto xdr_error;
1220         }
1221         write->wr_head.iov_base = p;
1222         write->wr_head.iov_len = avail;
1223         write->wr_pagelist = argp->pagelist;
1224
1225         len = XDR_QUADLEN(write->wr_buflen) << 2;
1226         if (len >= avail) {
1227                 int pages;
1228
1229                 len -= avail;
1230
1231                 pages = len >> PAGE_SHIFT;
1232                 argp->pagelist += pages;
1233                 argp->pagelen -= pages * PAGE_SIZE;
1234                 len -= pages * PAGE_SIZE;
1235
1236                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1237                 argp->pagelist++;
1238                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1239         }
1240         argp->p += XDR_QUADLEN(len);
1241
1242         DECODE_TAIL;
1243 }
1244
1245 static __be32
1246 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1247 {
1248         DECODE_HEAD;
1249
1250         if (argp->minorversion >= 1)
1251                 return nfserr_notsupp;
1252
1253         READ_BUF(12);
1254         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1255         rlockowner->rl_owner.len = be32_to_cpup(p++);
1256         READ_BUF(rlockowner->rl_owner.len);
1257         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1258
1259         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1260                 return nfserr_inval;
1261         DECODE_TAIL;
1262 }
1263
1264 static __be32
1265 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1266                          struct nfsd4_exchange_id *exid)
1267 {
1268         int dummy, tmp;
1269         DECODE_HEAD;
1270
1271         READ_BUF(NFS4_VERIFIER_SIZE);
1272         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1273
1274         status = nfsd4_decode_opaque(argp, &exid->clname);
1275         if (status)
1276                 return nfserr_bad_xdr;
1277
1278         READ_BUF(4);
1279         exid->flags = be32_to_cpup(p++);
1280
1281         /* Ignore state_protect4_a */
1282         READ_BUF(4);
1283         exid->spa_how = be32_to_cpup(p++);
1284         switch (exid->spa_how) {
1285         case SP4_NONE:
1286                 break;
1287         case SP4_MACH_CRED:
1288                 /* spo_must_enforce */
1289                 READ_BUF(4);
1290                 dummy = be32_to_cpup(p++);
1291                 READ_BUF(dummy * 4);
1292                 p += dummy;
1293
1294                 /* spo_must_allow */
1295                 READ_BUF(4);
1296                 dummy = be32_to_cpup(p++);
1297                 READ_BUF(dummy * 4);
1298                 p += dummy;
1299                 break;
1300         case SP4_SSV:
1301                 /* ssp_ops */
1302                 READ_BUF(4);
1303                 dummy = be32_to_cpup(p++);
1304                 READ_BUF(dummy * 4);
1305                 p += dummy;
1306
1307                 READ_BUF(4);
1308                 dummy = be32_to_cpup(p++);
1309                 READ_BUF(dummy * 4);
1310                 p += dummy;
1311
1312                 /* ssp_hash_algs<> */
1313                 READ_BUF(4);
1314                 tmp = be32_to_cpup(p++);
1315                 while (tmp--) {
1316                         READ_BUF(4);
1317                         dummy = be32_to_cpup(p++);
1318                         READ_BUF(dummy);
1319                         p += XDR_QUADLEN(dummy);
1320                 }
1321
1322                 /* ssp_encr_algs<> */
1323                 READ_BUF(4);
1324                 tmp = be32_to_cpup(p++);
1325                 while (tmp--) {
1326                         READ_BUF(4);
1327                         dummy = be32_to_cpup(p++);
1328                         READ_BUF(dummy);
1329                         p += XDR_QUADLEN(dummy);
1330                 }
1331
1332                 /* ssp_window and ssp_num_gss_handles */
1333                 READ_BUF(8);
1334                 dummy = be32_to_cpup(p++);
1335                 dummy = be32_to_cpup(p++);
1336                 break;
1337         default:
1338                 goto xdr_error;
1339         }
1340
1341         /* Ignore Implementation ID */
1342         READ_BUF(4);    /* nfs_impl_id4 array length */
1343         dummy = be32_to_cpup(p++);
1344
1345         if (dummy > 1)
1346                 goto xdr_error;
1347
1348         if (dummy == 1) {
1349                 /* nii_domain */
1350                 READ_BUF(4);
1351                 dummy = be32_to_cpup(p++);
1352                 READ_BUF(dummy);
1353                 p += XDR_QUADLEN(dummy);
1354
1355                 /* nii_name */
1356                 READ_BUF(4);
1357                 dummy = be32_to_cpup(p++);
1358                 READ_BUF(dummy);
1359                 p += XDR_QUADLEN(dummy);
1360
1361                 /* nii_date */
1362                 READ_BUF(12);
1363                 p += 3;
1364         }
1365         DECODE_TAIL;
1366 }
1367
1368 static __be32
1369 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1370                             struct nfsd4_create_session *sess)
1371 {
1372         DECODE_HEAD;
1373         u32 dummy;
1374
1375         READ_BUF(16);
1376         COPYMEM(&sess->clientid, 8);
1377         sess->seqid = be32_to_cpup(p++);
1378         sess->flags = be32_to_cpup(p++);
1379
1380         /* Fore channel attrs */
1381         READ_BUF(28);
1382         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1383         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1384         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1385         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1386         sess->fore_channel.maxops = be32_to_cpup(p++);
1387         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1388         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1389         if (sess->fore_channel.nr_rdma_attrs == 1) {
1390                 READ_BUF(4);
1391                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1392         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1393                 dprintk("Too many fore channel attr bitmaps!\n");
1394                 goto xdr_error;
1395         }
1396
1397         /* Back channel attrs */
1398         READ_BUF(28);
1399         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1400         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1401         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1402         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1403         sess->back_channel.maxops = be32_to_cpup(p++);
1404         sess->back_channel.maxreqs = be32_to_cpup(p++);
1405         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1406         if (sess->back_channel.nr_rdma_attrs == 1) {
1407                 READ_BUF(4);
1408                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1409         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1410                 dprintk("Too many back channel attr bitmaps!\n");
1411                 goto xdr_error;
1412         }
1413
1414         READ_BUF(4);
1415         sess->callback_prog = be32_to_cpup(p++);
1416         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1417         DECODE_TAIL;
1418 }
1419
1420 static __be32
1421 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1422                              struct nfsd4_destroy_session *destroy_session)
1423 {
1424         DECODE_HEAD;
1425         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1426         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1427
1428         DECODE_TAIL;
1429 }
1430
1431 static __be32
1432 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1433                           struct nfsd4_free_stateid *free_stateid)
1434 {
1435         DECODE_HEAD;
1436
1437         READ_BUF(sizeof(stateid_t));
1438         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1439         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1440
1441         DECODE_TAIL;
1442 }
1443
1444 static __be32
1445 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1446                       struct nfsd4_sequence *seq)
1447 {
1448         DECODE_HEAD;
1449
1450         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1451         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1452         seq->seqid = be32_to_cpup(p++);
1453         seq->slotid = be32_to_cpup(p++);
1454         seq->maxslots = be32_to_cpup(p++);
1455         seq->cachethis = be32_to_cpup(p++);
1456
1457         DECODE_TAIL;
1458 }
1459
1460 static __be32
1461 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1462 {
1463         int i;
1464         __be32 *p, status;
1465         struct nfsd4_test_stateid_id *stateid;
1466
1467         READ_BUF(4);
1468         test_stateid->ts_num_ids = ntohl(*p++);
1469
1470         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1471
1472         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1473                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1474                 if (!stateid) {
1475                         status = nfserrno(-ENOMEM);
1476                         goto out;
1477                 }
1478
1479                 INIT_LIST_HEAD(&stateid->ts_id_list);
1480                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1481
1482                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1483                 if (status)
1484                         goto out;
1485         }
1486
1487         status = 0;
1488 out:
1489         return status;
1490 xdr_error:
1491         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1492         status = nfserr_bad_xdr;
1493         goto out;
1494 }
1495
1496 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1497 {
1498         DECODE_HEAD;
1499
1500         READ_BUF(8);
1501         COPYMEM(&dc->clientid, 8);
1502
1503         DECODE_TAIL;
1504 }
1505
1506 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1507 {
1508         DECODE_HEAD;
1509
1510         READ_BUF(4);
1511         rc->rca_one_fs = be32_to_cpup(p++);
1512
1513         DECODE_TAIL;
1514 }
1515
1516 static __be32
1517 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1518                        struct nfsd4_fallocate *fallocate)
1519 {
1520         DECODE_HEAD;
1521
1522         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1523         if (status)
1524                 return status;
1525
1526         READ_BUF(16);
1527         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1528         xdr_decode_hyper(p, &fallocate->falloc_length);
1529
1530         DECODE_TAIL;
1531 }
1532
1533 static __be32
1534 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1535 {
1536         DECODE_HEAD;
1537
1538         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1539         if (status)
1540                 return status;
1541
1542         READ_BUF(8 + 4);
1543         p = xdr_decode_hyper(p, &seek->seek_offset);
1544         seek->seek_whence = be32_to_cpup(p);
1545
1546         DECODE_TAIL;
1547 }
1548
1549 static __be32
1550 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1551 {
1552         return nfs_ok;
1553 }
1554
1555 static __be32
1556 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1557 {
1558         return nfserr_notsupp;
1559 }
1560
1561 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1562
1563 static nfsd4_dec nfsd4_dec_ops[] = {
1564         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1565         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1566         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1567         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1568         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1569         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1570         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1571         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1572         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1573         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1574         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1575         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1576         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1577         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1578         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1579         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1580         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1581         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1582         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1583         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1584         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1585         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1586         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1587         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1588         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1589         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1590         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1591         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1592         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1593         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1594         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1595         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1596         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1597         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1598         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1599         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1600         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1601
1602         /* new operations for NFSv4.1 */
1603         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1604         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1605         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1606         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1607         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1608         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1609         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1610         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1611         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1612         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1613         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1614         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1615         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1616         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1617         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1618         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1619         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1620         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1621         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1622
1623         /* new operations for NFSv4.2 */
1624         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1625         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_notsupp,
1626         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1627         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1628         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1629         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1630         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1631         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1632         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1633         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1634         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1635         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1636 };
1637
1638 static inline bool
1639 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1640 {
1641         if (op->opnum < FIRST_NFS4_OP)
1642                 return false;
1643         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1644                 return false;
1645         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1646                 return false;
1647         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1648                 return false;
1649         return true;
1650 }
1651
1652 static __be32
1653 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1654 {
1655         DECODE_HEAD;
1656         struct nfsd4_op *op;
1657         bool cachethis = false;
1658         int auth_slack= argp->rqstp->rq_auth_slack;
1659         int max_reply = auth_slack + 8; /* opcnt, status */
1660         int readcount = 0;
1661         int readbytes = 0;
1662         int i;
1663
1664         READ_BUF(4);
1665         argp->taglen = be32_to_cpup(p++);
1666         READ_BUF(argp->taglen + 8);
1667         SAVEMEM(argp->tag, argp->taglen);
1668         argp->minorversion = be32_to_cpup(p++);
1669         argp->opcnt = be32_to_cpup(p++);
1670         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1671
1672         if (argp->taglen > NFSD4_MAX_TAGLEN)
1673                 goto xdr_error;
1674         if (argp->opcnt > 100)
1675                 goto xdr_error;
1676
1677         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1678                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1679                 if (!argp->ops) {
1680                         argp->ops = argp->iops;
1681                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1682                         goto xdr_error;
1683                 }
1684         }
1685
1686         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1687                 argp->opcnt = 0;
1688
1689         for (i = 0; i < argp->opcnt; i++) {
1690                 op = &argp->ops[i];
1691                 op->replay = NULL;
1692
1693                 READ_BUF(4);
1694                 op->opnum = be32_to_cpup(p++);
1695
1696                 if (nfsd4_opnum_in_range(argp, op))
1697                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1698                 else {
1699                         op->opnum = OP_ILLEGAL;
1700                         op->status = nfserr_op_illegal;
1701                 }
1702                 /*
1703                  * We'll try to cache the result in the DRC if any one
1704                  * op in the compound wants to be cached:
1705                  */
1706                 cachethis |= nfsd4_cache_this_op(op);
1707
1708                 if (op->opnum == OP_READ) {
1709                         readcount++;
1710                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1711                 } else
1712                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1713                 /*
1714                  * OP_LOCK may return a conflicting lock.  (Special case
1715                  * because it will just skip encoding this if it runs
1716                  * out of xdr buffer space, and it is the only operation
1717                  * that behaves this way.)
1718                  */
1719                 if (op->opnum == OP_LOCK)
1720                         max_reply += NFS4_OPAQUE_LIMIT;
1721
1722                 if (op->status) {
1723                         argp->opcnt = i+1;
1724                         break;
1725                 }
1726         }
1727         /* Sessions make the DRC unnecessary: */
1728         if (argp->minorversion)
1729                 cachethis = false;
1730         svc_reserve(argp->rqstp, max_reply + readbytes);
1731         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1732
1733         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1734                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1735
1736         DECODE_TAIL;
1737 }
1738
1739 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1740 {
1741         if (IS_I_VERSION(inode)) {
1742                 p = xdr_encode_hyper(p, inode->i_version);
1743         } else {
1744                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1745                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1746         }
1747         return p;
1748 }
1749
1750 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1751 {
1752         *p++ = cpu_to_be32(c->atomic);
1753         if (c->change_supported) {
1754                 p = xdr_encode_hyper(p, c->before_change);
1755                 p = xdr_encode_hyper(p, c->after_change);
1756         } else {
1757                 *p++ = cpu_to_be32(c->before_ctime_sec);
1758                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1759                 *p++ = cpu_to_be32(c->after_ctime_sec);
1760                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1761         }
1762         return p;
1763 }
1764
1765 /* Encode as an array of strings the string given with components
1766  * separated @sep, escaped with esc_enter and esc_exit.
1767  */
1768 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1769                                           char *components, char esc_enter,
1770                                           char esc_exit)
1771 {
1772         __be32 *p;
1773         __be32 pathlen;
1774         int pathlen_offset;
1775         int strlen, count=0;
1776         char *str, *end, *next;
1777
1778         dprintk("nfsd4_encode_components(%s)\n", components);
1779
1780         pathlen_offset = xdr->buf->len;
1781         p = xdr_reserve_space(xdr, 4);
1782         if (!p)
1783                 return nfserr_resource;
1784         p++; /* We will fill this in with @count later */
1785
1786         end = str = components;
1787         while (*end) {
1788                 bool found_esc = false;
1789
1790                 /* try to parse as esc_start, ..., esc_end, sep */
1791                 if (*str == esc_enter) {
1792                         for (; *end && (*end != esc_exit); end++)
1793                                 /* find esc_exit or end of string */;
1794                         next = end + 1;
1795                         if (*end && (!*next || *next == sep)) {
1796                                 str++;
1797                                 found_esc = true;
1798                         }
1799                 }
1800
1801                 if (!found_esc)
1802                         for (; *end && (*end != sep); end++)
1803                                 /* find sep or end of string */;
1804
1805                 strlen = end - str;
1806                 if (strlen) {
1807                         p = xdr_reserve_space(xdr, strlen + 4);
1808                         if (!p)
1809                                 return nfserr_resource;
1810                         p = xdr_encode_opaque(p, str, strlen);
1811                         count++;
1812                 }
1813                 else
1814                         end++;
1815                 if (found_esc)
1816                         end = next;
1817
1818                 str = end;
1819         }
1820         pathlen = htonl(count);
1821         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1822         return 0;
1823 }
1824
1825 /* Encode as an array of strings the string given with components
1826  * separated @sep.
1827  */
1828 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1829                                       char *components)
1830 {
1831         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1832 }
1833
1834 /*
1835  * encode a location element of a fs_locations structure
1836  */
1837 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1838                                         struct nfsd4_fs_location *location)
1839 {
1840         __be32 status;
1841
1842         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1843                                                 '[', ']');
1844         if (status)
1845                 return status;
1846         status = nfsd4_encode_components(xdr, '/', location->path);
1847         if (status)
1848                 return status;
1849         return 0;
1850 }
1851
1852 /*
1853  * Encode a path in RFC3530 'pathname4' format
1854  */
1855 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
1856                                 const struct path *root,
1857                                 const struct path *path)
1858 {
1859         struct path cur = *path;
1860         __be32 *p;
1861         struct dentry **components = NULL;
1862         unsigned int ncomponents = 0;
1863         __be32 err = nfserr_jukebox;
1864
1865         dprintk("nfsd4_encode_components(");
1866
1867         path_get(&cur);
1868         /* First walk the path up to the nfsd root, and store the
1869          * dentries/path components in an array.
1870          */
1871         for (;;) {
1872                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1873                         break;
1874                 if (cur.dentry == cur.mnt->mnt_root) {
1875                         if (follow_up(&cur))
1876                                 continue;
1877                         goto out_free;
1878                 }
1879                 if ((ncomponents & 15) == 0) {
1880                         struct dentry **new;
1881                         new = krealloc(components,
1882                                         sizeof(*new) * (ncomponents + 16),
1883                                         GFP_KERNEL);
1884                         if (!new)
1885                                 goto out_free;
1886                         components = new;
1887                 }
1888                 components[ncomponents++] = cur.dentry;
1889                 cur.dentry = dget_parent(cur.dentry);
1890         }
1891         err = nfserr_resource;
1892         p = xdr_reserve_space(xdr, 4);
1893         if (!p)
1894                 goto out_free;
1895         *p++ = cpu_to_be32(ncomponents);
1896
1897         while (ncomponents) {
1898                 struct dentry *dentry = components[ncomponents - 1];
1899                 unsigned int len;
1900
1901                 spin_lock(&dentry->d_lock);
1902                 len = dentry->d_name.len;
1903                 p = xdr_reserve_space(xdr, len + 4);
1904                 if (!p) {
1905                         spin_unlock(&dentry->d_lock);
1906                         goto out_free;
1907                 }
1908                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
1909                 dprintk("/%pd", dentry);
1910                 spin_unlock(&dentry->d_lock);
1911                 dput(dentry);
1912                 ncomponents--;
1913         }
1914
1915         err = 0;
1916 out_free:
1917         dprintk(")\n");
1918         while (ncomponents)
1919                 dput(components[--ncomponents]);
1920         kfree(components);
1921         path_put(&cur);
1922         return err;
1923 }
1924
1925 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
1926                         struct svc_rqst *rqstp, const struct path *path)
1927 {
1928         struct svc_export *exp_ps;
1929         __be32 res;
1930
1931         exp_ps = rqst_find_fsidzero_export(rqstp);
1932         if (IS_ERR(exp_ps))
1933                 return nfserrno(PTR_ERR(exp_ps));
1934         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
1935         exp_put(exp_ps);
1936         return res;
1937 }
1938
1939 /*
1940  *  encode a fs_locations structure
1941  */
1942 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
1943                         struct svc_rqst *rqstp, struct svc_export *exp)
1944 {
1945         __be32 status;
1946         int i;
1947         __be32 *p;
1948         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1949
1950         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1951         if (status)
1952                 return status;
1953         p = xdr_reserve_space(xdr, 4);
1954         if (!p)
1955                 return nfserr_resource;
1956         *p++ = cpu_to_be32(fslocs->locations_count);
1957         for (i=0; i<fslocs->locations_count; i++) {
1958                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1959                 if (status)
1960                         return status;
1961         }
1962         return 0;
1963 }
1964
1965 static u32 nfs4_file_type(umode_t mode)
1966 {
1967         switch (mode & S_IFMT) {
1968         case S_IFIFO:   return NF4FIFO;
1969         case S_IFCHR:   return NF4CHR;
1970         case S_IFDIR:   return NF4DIR;
1971         case S_IFBLK:   return NF4BLK;
1972         case S_IFLNK:   return NF4LNK;
1973         case S_IFREG:   return NF4REG;
1974         case S_IFSOCK:  return NF4SOCK;
1975         default:        return NF4BAD;
1976         };
1977 }
1978
1979 static inline __be32
1980 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1981                      struct nfs4_ace *ace)
1982 {
1983         if (ace->whotype != NFS4_ACL_WHO_NAMED)
1984                 return nfs4_acl_write_who(xdr, ace->whotype);
1985         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1986                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1987         else
1988                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1989 }
1990
1991 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1992                               FATTR4_WORD0_RDATTR_ERROR)
1993 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1994
1995 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1996 static inline __be32
1997 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1998                             void *context, int len)
1999 {
2000         __be32 *p;
2001
2002         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2003         if (!p)
2004                 return nfserr_resource;
2005
2006         /*
2007          * For now we use a 0 here to indicate the null translation; in
2008          * the future we may place a call to translation code here.
2009          */
2010         *p++ = cpu_to_be32(0); /* lfs */
2011         *p++ = cpu_to_be32(0); /* pi */
2012         p = xdr_encode_opaque(p, context, len);
2013         return 0;
2014 }
2015 #else
2016 static inline __be32
2017 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2018                             void *context, int len)
2019 { return 0; }
2020 #endif
2021
2022 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2023 {
2024         /* As per referral draft:  */
2025         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2026             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2027                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2028                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2029                         *rdattr_err = NFSERR_MOVED;
2030                 else
2031                         return nfserr_moved;
2032         }
2033         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2034         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2035         return 0;
2036 }
2037
2038
2039 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2040 {
2041         struct path path = exp->ex_path;
2042         int err;
2043
2044         path_get(&path);
2045         while (follow_up(&path)) {
2046                 if (path.dentry != path.mnt->mnt_root)
2047                         break;
2048         }
2049         err = vfs_getattr(&path, stat);
2050         path_put(&path);
2051         return err;
2052 }
2053
2054 /*
2055  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2056  * ourselves.
2057  */
2058 static __be32
2059 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2060                 struct svc_export *exp,
2061                 struct dentry *dentry, u32 *bmval,
2062                 struct svc_rqst *rqstp, int ignore_crossmnt)
2063 {
2064         u32 bmval0 = bmval[0];
2065         u32 bmval1 = bmval[1];
2066         u32 bmval2 = bmval[2];
2067         struct kstat stat;
2068         struct svc_fh *tempfh = NULL;
2069         struct kstatfs statfs;
2070         __be32 *p;
2071         int starting_len = xdr->buf->len;
2072         int attrlen_offset;
2073         __be32 attrlen;
2074         u32 dummy;
2075         u64 dummy64;
2076         u32 rdattr_err = 0;
2077         __be32 status;
2078         int err;
2079         int aclsupport = 0;
2080         struct nfs4_acl *acl = NULL;
2081         void *context = NULL;
2082         int contextlen;
2083         bool contextsupport = false;
2084         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2085         u32 minorversion = resp->cstate.minorversion;
2086         struct path path = {
2087                 .mnt    = exp->ex_path.mnt,
2088                 .dentry = dentry,
2089         };
2090         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2091
2092         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2093         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2094         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2095         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2096
2097         if (exp->ex_fslocs.migrated) {
2098                 BUG_ON(bmval[2]);
2099                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2100                 if (status)
2101                         goto out;
2102         }
2103
2104         err = vfs_getattr(&path, &stat);
2105         if (err)
2106                 goto out_nfserr;
2107         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2108                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2109             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2110                        FATTR4_WORD1_SPACE_TOTAL))) {
2111                 err = vfs_statfs(&path, &statfs);
2112                 if (err)
2113                         goto out_nfserr;
2114         }
2115         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2116                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2117                 status = nfserr_jukebox;
2118                 if (!tempfh)
2119                         goto out;
2120                 fh_init(tempfh, NFS4_FHSIZE);
2121                 status = fh_compose(tempfh, exp, dentry, NULL);
2122                 if (status)
2123                         goto out;
2124                 fhp = tempfh;
2125         }
2126         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2127                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2128                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2129                 aclsupport = (err == 0);
2130                 if (bmval0 & FATTR4_WORD0_ACL) {
2131                         if (err == -EOPNOTSUPP)
2132                                 bmval0 &= ~FATTR4_WORD0_ACL;
2133                         else if (err == -EINVAL) {
2134                                 status = nfserr_attrnotsupp;
2135                                 goto out;
2136                         } else if (err != 0)
2137                                 goto out_nfserr;
2138                 }
2139         }
2140
2141 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2142         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2143                         bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2144                 err = security_inode_getsecctx(dentry->d_inode,
2145                                                 &context, &contextlen);
2146                 contextsupport = (err == 0);
2147                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2148                         if (err == -EOPNOTSUPP)
2149                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2150                         else if (err)
2151                                 goto out_nfserr;
2152                 }
2153         }
2154 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2155
2156         if (bmval2) {
2157                 p = xdr_reserve_space(xdr, 16);
2158                 if (!p)
2159                         goto out_resource;
2160                 *p++ = cpu_to_be32(3);
2161                 *p++ = cpu_to_be32(bmval0);
2162                 *p++ = cpu_to_be32(bmval1);
2163                 *p++ = cpu_to_be32(bmval2);
2164         } else if (bmval1) {
2165                 p = xdr_reserve_space(xdr, 12);
2166                 if (!p)
2167                         goto out_resource;
2168                 *p++ = cpu_to_be32(2);
2169                 *p++ = cpu_to_be32(bmval0);
2170                 *p++ = cpu_to_be32(bmval1);
2171         } else {
2172                 p = xdr_reserve_space(xdr, 8);
2173                 if (!p)
2174                         goto out_resource;
2175                 *p++ = cpu_to_be32(1);
2176                 *p++ = cpu_to_be32(bmval0);
2177         }
2178
2179         attrlen_offset = xdr->buf->len;
2180         p = xdr_reserve_space(xdr, 4);
2181         if (!p)
2182                 goto out_resource;
2183         p++;                /* to be backfilled later */
2184
2185         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2186                 u32 word0 = nfsd_suppattrs0(minorversion);
2187                 u32 word1 = nfsd_suppattrs1(minorversion);
2188                 u32 word2 = nfsd_suppattrs2(minorversion);
2189
2190                 if (!aclsupport)
2191                         word0 &= ~FATTR4_WORD0_ACL;
2192                 if (!contextsupport)
2193                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2194                 if (!word2) {
2195                         p = xdr_reserve_space(xdr, 12);
2196                         if (!p)
2197                                 goto out_resource;
2198                         *p++ = cpu_to_be32(2);
2199                         *p++ = cpu_to_be32(word0);
2200                         *p++ = cpu_to_be32(word1);
2201                 } else {
2202                         p = xdr_reserve_space(xdr, 16);
2203                         if (!p)
2204                                 goto out_resource;
2205                         *p++ = cpu_to_be32(3);
2206                         *p++ = cpu_to_be32(word0);
2207                         *p++ = cpu_to_be32(word1);
2208                         *p++ = cpu_to_be32(word2);
2209                 }
2210         }
2211         if (bmval0 & FATTR4_WORD0_TYPE) {
2212                 p = xdr_reserve_space(xdr, 4);
2213                 if (!p)
2214                         goto out_resource;
2215                 dummy = nfs4_file_type(stat.mode);
2216                 if (dummy == NF4BAD) {
2217                         status = nfserr_serverfault;
2218                         goto out;
2219                 }
2220                 *p++ = cpu_to_be32(dummy);
2221         }
2222         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2223                 p = xdr_reserve_space(xdr, 4);
2224                 if (!p)
2225                         goto out_resource;
2226                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2227                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2228                 else
2229                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2230                                                 NFS4_FH_VOL_RENAME);
2231         }
2232         if (bmval0 & FATTR4_WORD0_CHANGE) {
2233                 p = xdr_reserve_space(xdr, 8);
2234                 if (!p)
2235                         goto out_resource;
2236                 p = encode_change(p, &stat, dentry->d_inode);
2237         }
2238         if (bmval0 & FATTR4_WORD0_SIZE) {
2239                 p = xdr_reserve_space(xdr, 8);
2240                 if (!p)
2241                         goto out_resource;
2242                 p = xdr_encode_hyper(p, stat.size);
2243         }
2244         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2245                 p = xdr_reserve_space(xdr, 4);
2246                 if (!p)
2247                         goto out_resource;
2248                 *p++ = cpu_to_be32(1);
2249         }
2250         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2251                 p = xdr_reserve_space(xdr, 4);
2252                 if (!p)
2253                         goto out_resource;
2254                 *p++ = cpu_to_be32(1);
2255         }
2256         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2257                 p = xdr_reserve_space(xdr, 4);
2258                 if (!p)
2259                         goto out_resource;
2260                 *p++ = cpu_to_be32(0);
2261         }
2262         if (bmval0 & FATTR4_WORD0_FSID) {
2263                 p = xdr_reserve_space(xdr, 16);
2264                 if (!p)
2265                         goto out_resource;
2266                 if (exp->ex_fslocs.migrated) {
2267                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2268                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2269                 } else switch(fsid_source(fhp)) {
2270                 case FSIDSOURCE_FSID:
2271                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2272                         p = xdr_encode_hyper(p, (u64)0);
2273                         break;
2274                 case FSIDSOURCE_DEV:
2275                         *p++ = cpu_to_be32(0);
2276                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2277                         *p++ = cpu_to_be32(0);
2278                         *p++ = cpu_to_be32(MINOR(stat.dev));
2279                         break;
2280                 case FSIDSOURCE_UUID:
2281                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2282                                                                 EX_UUID_LEN);
2283                         break;
2284                 }
2285         }
2286         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2287                 p = xdr_reserve_space(xdr, 4);
2288                 if (!p)
2289                         goto out_resource;
2290                 *p++ = cpu_to_be32(0);
2291         }
2292         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2293                 p = xdr_reserve_space(xdr, 4);
2294                 if (!p)
2295                         goto out_resource;
2296                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2297         }
2298         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2299                 p = xdr_reserve_space(xdr, 4);
2300                 if (!p)
2301                         goto out_resource;
2302                 *p++ = cpu_to_be32(rdattr_err);
2303         }
2304         if (bmval0 & FATTR4_WORD0_ACL) {
2305                 struct nfs4_ace *ace;
2306
2307                 if (acl == NULL) {
2308                         p = xdr_reserve_space(xdr, 4);
2309                         if (!p)
2310                                 goto out_resource;
2311
2312                         *p++ = cpu_to_be32(0);
2313                         goto out_acl;
2314                 }
2315                 p = xdr_reserve_space(xdr, 4);
2316                 if (!p)
2317                         goto out_resource;
2318                 *p++ = cpu_to_be32(acl->naces);
2319
2320                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2321                         p = xdr_reserve_space(xdr, 4*3);
2322                         if (!p)
2323                                 goto out_resource;
2324                         *p++ = cpu_to_be32(ace->type);
2325                         *p++ = cpu_to_be32(ace->flag);
2326                         *p++ = cpu_to_be32(ace->access_mask &
2327                                                         NFS4_ACE_MASK_ALL);
2328                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2329                         if (status)
2330                                 goto out;
2331                 }
2332         }
2333 out_acl:
2334         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2335                 p = xdr_reserve_space(xdr, 4);
2336                 if (!p)
2337                         goto out_resource;
2338                 *p++ = cpu_to_be32(aclsupport ?
2339                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2340         }
2341         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2342                 p = xdr_reserve_space(xdr, 4);
2343                 if (!p)
2344                         goto out_resource;
2345                 *p++ = cpu_to_be32(1);
2346         }
2347         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2348                 p = xdr_reserve_space(xdr, 4);
2349                 if (!p)
2350                         goto out_resource;
2351                 *p++ = cpu_to_be32(0);
2352         }
2353         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2354                 p = xdr_reserve_space(xdr, 4);
2355                 if (!p)
2356                         goto out_resource;
2357                 *p++ = cpu_to_be32(1);
2358         }
2359         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2360                 p = xdr_reserve_space(xdr, 4);
2361                 if (!p)
2362                         goto out_resource;
2363                 *p++ = cpu_to_be32(1);
2364         }
2365         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2366                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2367                 if (!p)
2368                         goto out_resource;
2369                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2370                                         fhp->fh_handle.fh_size);
2371         }
2372         if (bmval0 & FATTR4_WORD0_FILEID) {
2373                 p = xdr_reserve_space(xdr, 8);
2374                 if (!p)
2375                         goto out_resource;
2376                 p = xdr_encode_hyper(p, stat.ino);
2377         }
2378         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2379                 p = xdr_reserve_space(xdr, 8);
2380                 if (!p)
2381                         goto out_resource;
2382                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2383         }
2384         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2385                 p = xdr_reserve_space(xdr, 8);
2386                 if (!p)
2387                         goto out_resource;
2388                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2389         }
2390         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2391                 p = xdr_reserve_space(xdr, 8);
2392                 if (!p)
2393                         goto out_resource;
2394                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2395         }
2396         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2397                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2398                 if (status)
2399                         goto out;
2400         }
2401         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2402                 p = xdr_reserve_space(xdr, 4);
2403                 if (!p)
2404                         goto out_resource;
2405                 *p++ = cpu_to_be32(1);
2406         }
2407         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2408                 p = xdr_reserve_space(xdr, 8);
2409                 if (!p)
2410                         goto out_resource;
2411                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2412         }
2413         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2414                 p = xdr_reserve_space(xdr, 4);
2415                 if (!p)
2416                         goto out_resource;
2417                 *p++ = cpu_to_be32(255);
2418         }
2419         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2420                 p = xdr_reserve_space(xdr, 4);
2421                 if (!p)
2422                         goto out_resource;
2423                 *p++ = cpu_to_be32(statfs.f_namelen);
2424         }
2425         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2426                 p = xdr_reserve_space(xdr, 8);
2427                 if (!p)
2428                         goto out_resource;
2429                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2430         }
2431         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2432                 p = xdr_reserve_space(xdr, 8);
2433                 if (!p)
2434                         goto out_resource;
2435                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2436         }
2437         if (bmval1 & FATTR4_WORD1_MODE) {
2438                 p = xdr_reserve_space(xdr, 4);
2439                 if (!p)
2440                         goto out_resource;
2441                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2442         }
2443         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2444                 p = xdr_reserve_space(xdr, 4);
2445                 if (!p)
2446                         goto out_resource;
2447                 *p++ = cpu_to_be32(1);
2448         }
2449         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2450                 p = xdr_reserve_space(xdr, 4);
2451                 if (!p)
2452                         goto out_resource;
2453                 *p++ = cpu_to_be32(stat.nlink);
2454         }
2455         if (bmval1 & FATTR4_WORD1_OWNER) {
2456                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2457                 if (status)
2458                         goto out;
2459         }
2460         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2461                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2462                 if (status)
2463                         goto out;
2464         }
2465         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2466                 p = xdr_reserve_space(xdr, 8);
2467                 if (!p)
2468                         goto out_resource;
2469                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2470                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2471         }
2472         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2473                 p = xdr_reserve_space(xdr, 8);
2474                 if (!p)
2475                         goto out_resource;
2476                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2477                 p = xdr_encode_hyper(p, dummy64);
2478         }
2479         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2480                 p = xdr_reserve_space(xdr, 8);
2481                 if (!p)
2482                         goto out_resource;
2483                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2484                 p = xdr_encode_hyper(p, dummy64);
2485         }
2486         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2487                 p = xdr_reserve_space(xdr, 8);
2488                 if (!p)
2489                         goto out_resource;
2490                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2491                 p = xdr_encode_hyper(p, dummy64);
2492         }
2493         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2494                 p = xdr_reserve_space(xdr, 8);
2495                 if (!p)
2496                         goto out_resource;
2497                 dummy64 = (u64)stat.blocks << 9;
2498                 p = xdr_encode_hyper(p, dummy64);
2499         }
2500         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2501                 p = xdr_reserve_space(xdr, 12);
2502                 if (!p)
2503                         goto out_resource;
2504                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2505                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2506         }
2507         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2508                 p = xdr_reserve_space(xdr, 12);
2509                 if (!p)
2510                         goto out_resource;
2511                 *p++ = cpu_to_be32(0);
2512                 *p++ = cpu_to_be32(1);
2513                 *p++ = cpu_to_be32(0);
2514         }
2515         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2516                 p = xdr_reserve_space(xdr, 12);
2517                 if (!p)
2518                         goto out_resource;
2519                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2520                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2521         }
2522         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2523                 p = xdr_reserve_space(xdr, 12);
2524                 if (!p)
2525                         goto out_resource;
2526                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2527                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2528         }
2529         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2530                 p = xdr_reserve_space(xdr, 8);
2531                 if (!p)
2532                         goto out_resource;
2533                 /*
2534                  * Get parent's attributes if not ignoring crossmount
2535                  * and this is the root of a cross-mounted filesystem.
2536                  */
2537                 if (ignore_crossmnt == 0 &&
2538                     dentry == exp->ex_path.mnt->mnt_root)
2539                         get_parent_attributes(exp, &stat);
2540                 p = xdr_encode_hyper(p, stat.ino);
2541         }
2542         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2543                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2544                                                                 contextlen);
2545                 if (status)
2546                         goto out;
2547         }
2548         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2549                 p = xdr_reserve_space(xdr, 16);
2550                 if (!p)
2551                         goto out_resource;
2552                 *p++ = cpu_to_be32(3);
2553                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2554                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2555                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2556         }
2557
2558         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2559         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2560         status = nfs_ok;
2561
2562 out:
2563 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2564         if (context)
2565                 security_release_secctx(context, contextlen);
2566 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2567         kfree(acl);
2568         if (tempfh) {
2569                 fh_put(tempfh);
2570                 kfree(tempfh);
2571         }
2572         if (status)
2573                 xdr_truncate_encode(xdr, starting_len);
2574         return status;
2575 out_nfserr:
2576         status = nfserrno(err);
2577         goto out;
2578 out_resource:
2579         status = nfserr_resource;
2580         goto out;
2581 }
2582
2583 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2584                                 struct xdr_buf *buf, __be32 *p, int bytes)
2585 {
2586         xdr->scratch.iov_len = 0;
2587         memset(buf, 0, sizeof(struct xdr_buf));
2588         buf->head[0].iov_base = p;
2589         buf->head[0].iov_len = 0;
2590         buf->len = 0;
2591         xdr->buf = buf;
2592         xdr->iov = buf->head;
2593         xdr->p = p;
2594         xdr->end = (void *)p + bytes;
2595         buf->buflen = bytes;
2596 }
2597
2598 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2599                         struct svc_fh *fhp, struct svc_export *exp,
2600                         struct dentry *dentry, u32 *bmval,
2601                         struct svc_rqst *rqstp, int ignore_crossmnt)
2602 {
2603         struct xdr_buf dummy;
2604         struct xdr_stream xdr;
2605         __be32 ret;
2606
2607         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2608         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2609                                                         ignore_crossmnt);
2610         *p = xdr.p;
2611         return ret;
2612 }
2613
2614 static inline int attributes_need_mount(u32 *bmval)
2615 {
2616         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2617                 return 1;
2618         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2619                 return 1;
2620         return 0;
2621 }
2622
2623 static __be32
2624 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2625                         const char *name, int namlen)
2626 {
2627         struct svc_export *exp = cd->rd_fhp->fh_export;
2628         struct dentry *dentry;
2629         __be32 nfserr;
2630         int ignore_crossmnt = 0;
2631
2632         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2633         if (IS_ERR(dentry))
2634                 return nfserrno(PTR_ERR(dentry));
2635         if (!dentry->d_inode) {
2636                 /*
2637                  * nfsd_buffered_readdir drops the i_mutex between
2638                  * readdir and calling this callback, leaving a window
2639                  * where this directory entry could have gone away.
2640                  */
2641                 dput(dentry);
2642                 return nfserr_noent;
2643         }
2644
2645         exp_get(exp);
2646         /*
2647          * In the case of a mountpoint, the client may be asking for
2648          * attributes that are only properties of the underlying filesystem
2649          * as opposed to the cross-mounted file system. In such a case,
2650          * we will not follow the cross mount and will fill the attribtutes
2651          * directly from the mountpoint dentry.
2652          */
2653         if (nfsd_mountpoint(dentry, exp)) {
2654                 int err;
2655
2656                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2657                                 && !attributes_need_mount(cd->rd_bmval)) {
2658                         ignore_crossmnt = 1;
2659                         goto out_encode;
2660                 }
2661                 /*
2662                  * Why the heck aren't we just using nfsd_lookup??
2663                  * Different "."/".." handling?  Something else?
2664                  * At least, add a comment here to explain....
2665                  */
2666                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2667                 if (err) {
2668                         nfserr = nfserrno(err);
2669                         goto out_put;
2670                 }
2671                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2672                 if (nfserr)
2673                         goto out_put;
2674
2675         }
2676 out_encode:
2677         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2678                                         cd->rd_rqstp, ignore_crossmnt);
2679 out_put:
2680         dput(dentry);
2681         exp_put(exp);
2682         return nfserr;
2683 }
2684
2685 static __be32 *
2686 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2687 {
2688         __be32 *p;
2689
2690         p = xdr_reserve_space(xdr, 20);
2691         if (!p)
2692                 return NULL;
2693         *p++ = htonl(2);
2694         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2695         *p++ = htonl(0);                         /* bmval1 */
2696
2697         *p++ = htonl(4);     /* attribute length */
2698         *p++ = nfserr;       /* no htonl */
2699         return p;
2700 }
2701
2702 static int
2703 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2704                     loff_t offset, u64 ino, unsigned int d_type)
2705 {
2706         struct readdir_cd *ccd = ccdv;
2707         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2708         struct xdr_stream *xdr = cd->xdr;
2709         int start_offset = xdr->buf->len;
2710         int cookie_offset;
2711         u32 name_and_cookie;
2712         int entry_bytes;
2713         __be32 nfserr = nfserr_toosmall;
2714         __be64 wire_offset;
2715         __be32 *p;
2716
2717         /* In nfsv4, "." and ".." never make it onto the wire.. */
2718         if (name && isdotent(name, namlen)) {
2719                 cd->common.err = nfs_ok;
2720                 return 0;
2721         }
2722
2723         if (cd->cookie_offset) {
2724                 wire_offset = cpu_to_be64(offset);
2725                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2726                                                         &wire_offset, 8);
2727         }
2728
2729         p = xdr_reserve_space(xdr, 4);
2730         if (!p)
2731                 goto fail;
2732         *p++ = xdr_one;                             /* mark entry present */
2733         cookie_offset = xdr->buf->len;
2734         p = xdr_reserve_space(xdr, 3*4 + namlen);
2735         if (!p)
2736                 goto fail;
2737         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2738         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2739
2740         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2741         switch (nfserr) {
2742         case nfs_ok:
2743                 break;
2744         case nfserr_resource:
2745                 nfserr = nfserr_toosmall;
2746                 goto fail;
2747         case nfserr_noent:
2748                 xdr_truncate_encode(xdr, start_offset);
2749                 goto skip_entry;
2750         default:
2751                 /*
2752                  * If the client requested the RDATTR_ERROR attribute,
2753                  * we stuff the error code into this attribute
2754                  * and continue.  If this attribute was not requested,
2755                  * then in accordance with the spec, we fail the
2756                  * entire READDIR operation(!)
2757                  */
2758                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2759                         goto fail;
2760                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2761                 if (p == NULL) {
2762                         nfserr = nfserr_toosmall;
2763                         goto fail;
2764                 }
2765         }
2766         nfserr = nfserr_toosmall;
2767         entry_bytes = xdr->buf->len - start_offset;
2768         if (entry_bytes > cd->rd_maxcount)
2769                 goto fail;
2770         cd->rd_maxcount -= entry_bytes;
2771         if (!cd->rd_dircount)
2772                 goto fail;
2773         /*
2774          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
2775          * let's always let through the first entry, at least:
2776          */
2777         name_and_cookie = 4 * XDR_QUADLEN(namlen) + 8;
2778         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
2779                 goto fail;
2780         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
2781         cd->cookie_offset = cookie_offset;
2782 skip_entry:
2783         cd->common.err = nfs_ok;
2784         return 0;
2785 fail:
2786         xdr_truncate_encode(xdr, start_offset);
2787         cd->common.err = nfserr;
2788         return -EINVAL;
2789 }
2790
2791 static __be32
2792 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2793 {
2794         __be32 *p;
2795
2796         p = xdr_reserve_space(xdr, sizeof(stateid_t));
2797         if (!p)
2798                 return nfserr_resource;
2799         *p++ = cpu_to_be32(sid->si_generation);
2800         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
2801                                         sizeof(stateid_opaque_t));
2802         return 0;
2803 }
2804
2805 static __be32
2806 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2807 {
2808         struct xdr_stream *xdr = &resp->xdr;
2809         __be32 *p;
2810
2811         if (!nfserr) {
2812                 p = xdr_reserve_space(xdr, 8);
2813                 if (!p)
2814                         return nfserr_resource;
2815                 *p++ = cpu_to_be32(access->ac_supported);
2816                 *p++ = cpu_to_be32(access->ac_resp_access);
2817         }
2818         return nfserr;
2819 }
2820
2821 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2822 {
2823         struct xdr_stream *xdr = &resp->xdr;
2824         __be32 *p;
2825
2826         if (!nfserr) {
2827                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
2828                 if (!p)
2829                         return nfserr_resource;
2830                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
2831                                                 NFS4_MAX_SESSIONID_LEN);
2832                 *p++ = cpu_to_be32(bcts->dir);
2833                 /* Sorry, we do not yet support RDMA over 4.1: */
2834                 *p++ = cpu_to_be32(0);
2835         }
2836         return nfserr;
2837 }
2838
2839 static __be32
2840 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2841 {
2842         struct xdr_stream *xdr = &resp->xdr;
2843
2844         if (!nfserr)
2845                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2846
2847         return nfserr;
2848 }
2849
2850
2851 static __be32
2852 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2853 {
2854         struct xdr_stream *xdr = &resp->xdr;
2855         __be32 *p;
2856
2857         if (!nfserr) {
2858                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
2859                 if (!p)
2860                         return nfserr_resource;
2861                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
2862                                                 NFS4_VERIFIER_SIZE);
2863         }
2864         return nfserr;
2865 }
2866
2867 static __be32
2868 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2869 {
2870         struct xdr_stream *xdr = &resp->xdr;
2871         __be32 *p;
2872
2873         if (!nfserr) {
2874                 p = xdr_reserve_space(xdr, 32);
2875                 if (!p)
2876                         return nfserr_resource;
2877                 p = encode_cinfo(p, &create->cr_cinfo);
2878                 *p++ = cpu_to_be32(2);
2879                 *p++ = cpu_to_be32(create->cr_bmval[0]);
2880                 *p++ = cpu_to_be32(create->cr_bmval[1]);
2881         }
2882         return nfserr;
2883 }
2884
2885 static __be32
2886 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2887 {
2888         struct svc_fh *fhp = getattr->ga_fhp;
2889         struct xdr_stream *xdr = &resp->xdr;
2890
2891         if (nfserr)
2892                 return nfserr;
2893
2894         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
2895                                     getattr->ga_bmval,
2896                                     resp->rqstp, 0);
2897         return nfserr;
2898 }
2899
2900 static __be32
2901 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2902 {
2903         struct xdr_stream *xdr = &resp->xdr;
2904         struct svc_fh *fhp = *fhpp;
2905         unsigned int len;
2906         __be32 *p;
2907
2908         if (!nfserr) {
2909                 len = fhp->fh_handle.fh_size;
2910                 p = xdr_reserve_space(xdr, len + 4);
2911                 if (!p)
2912                         return nfserr_resource;
2913                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
2914         }
2915         return nfserr;
2916 }
2917
2918 /*
2919 * Including all fields other than the name, a LOCK4denied structure requires
2920 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2921 */
2922 static __be32
2923 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
2924 {
2925         struct xdr_netobj *conf = &ld->ld_owner;
2926         __be32 *p;
2927
2928 again:
2929         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2930         if (!p) {
2931                 /*
2932                  * Don't fail to return the result just because we can't
2933                  * return the conflicting open:
2934                  */
2935                 if (conf->len) {
2936                         kfree(conf->data);
2937                         conf->len = 0;
2938                         conf->data = NULL;
2939                         goto again;
2940                 }
2941                 return nfserr_resource;
2942         }
2943         p = xdr_encode_hyper(p, ld->ld_start);
2944         p = xdr_encode_hyper(p, ld->ld_length);
2945         *p++ = cpu_to_be32(ld->ld_type);
2946         if (conf->len) {
2947                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
2948                 p = xdr_encode_opaque(p, conf->data, conf->len);
2949                 kfree(conf->data);
2950         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2951                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
2952                 *p++ = cpu_to_be32(0); /* length of owner name */
2953         }
2954         return nfserr_denied;
2955 }
2956
2957 static __be32
2958 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2959 {
2960         struct xdr_stream *xdr = &resp->xdr;
2961
2962         if (!nfserr)
2963                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2964         else if (nfserr == nfserr_denied)
2965                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2966
2967         return nfserr;
2968 }
2969
2970 static __be32
2971 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2972 {
2973         struct xdr_stream *xdr = &resp->xdr;
2974
2975         if (nfserr == nfserr_denied)
2976                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2977         return nfserr;
2978 }
2979
2980 static __be32
2981 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2982 {
2983         struct xdr_stream *xdr = &resp->xdr;
2984
2985         if (!nfserr)
2986                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2987
2988         return nfserr;
2989 }
2990
2991
2992 static __be32
2993 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2994 {
2995         struct xdr_stream *xdr = &resp->xdr;
2996         __be32 *p;
2997
2998         if (!nfserr) {
2999                 p = xdr_reserve_space(xdr, 20);
3000                 if (!p)
3001                         return nfserr_resource;
3002                 p = encode_cinfo(p, &link->li_cinfo);
3003         }
3004         return nfserr;
3005 }
3006
3007
3008 static __be32
3009 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3010 {
3011         struct xdr_stream *xdr = &resp->xdr;
3012         __be32 *p;
3013
3014         if (nfserr)
3015                 goto out;
3016
3017         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3018         if (nfserr)
3019                 goto out;
3020         p = xdr_reserve_space(xdr, 40);
3021         if (!p)
3022                 return nfserr_resource;
3023         p = encode_cinfo(p, &open->op_cinfo);
3024         *p++ = cpu_to_be32(open->op_rflags);
3025         *p++ = cpu_to_be32(2);
3026         *p++ = cpu_to_be32(open->op_bmval[0]);
3027         *p++ = cpu_to_be32(open->op_bmval[1]);
3028         *p++ = cpu_to_be32(open->op_delegate_type);
3029
3030         switch (open->op_delegate_type) {
3031         case NFS4_OPEN_DELEGATE_NONE:
3032                 break;
3033         case NFS4_OPEN_DELEGATE_READ:
3034                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3035                 if (nfserr)
3036                         return nfserr;
3037                 p = xdr_reserve_space(xdr, 20);
3038                 if (!p)
3039                         return nfserr_resource;
3040                 *p++ = cpu_to_be32(open->op_recall);
3041
3042                 /*
3043                  * TODO: ACE's in delegations
3044                  */
3045                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3046                 *p++ = cpu_to_be32(0);
3047                 *p++ = cpu_to_be32(0);
3048                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3049                 break;
3050         case NFS4_OPEN_DELEGATE_WRITE:
3051                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3052                 if (nfserr)
3053                         return nfserr;
3054                 p = xdr_reserve_space(xdr, 32);
3055                 if (!p)
3056                         return nfserr_resource;
3057                 *p++ = cpu_to_be32(0);
3058
3059                 /*
3060                  * TODO: space_limit's in delegations
3061                  */
3062                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3063                 *p++ = cpu_to_be32(~(u32)0);
3064                 *p++ = cpu_to_be32(~(u32)0);
3065
3066                 /*
3067                  * TODO: ACE's in delegations
3068                  */
3069                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3070                 *p++ = cpu_to_be32(0);
3071                 *p++ = cpu_to_be32(0);
3072                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3073                 break;
3074         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3075                 switch (open->op_why_no_deleg) {
3076                 case WND4_CONTENTION:
3077                 case WND4_RESOURCE:
3078                         p = xdr_reserve_space(xdr, 8);
3079                         if (!p)
3080                                 return nfserr_resource;
3081                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3082                         /* deleg signaling not supported yet: */
3083                         *p++ = cpu_to_be32(0);
3084                         break;
3085                 default:
3086                         p = xdr_reserve_space(xdr, 4);
3087                         if (!p)
3088                                 return nfserr_resource;
3089                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3090                 }
3091                 break;
3092         default:
3093                 BUG();
3094         }
3095         /* XXX save filehandle here */
3096 out:
3097         return nfserr;
3098 }
3099
3100 static __be32
3101 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3102 {
3103         struct xdr_stream *xdr = &resp->xdr;
3104
3105         if (!nfserr)
3106                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3107
3108         return nfserr;
3109 }
3110
3111 static __be32
3112 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3113 {
3114         struct xdr_stream *xdr = &resp->xdr;
3115
3116         if (!nfserr)
3117                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3118
3119         return nfserr;
3120 }
3121
3122 static __be32 nfsd4_encode_splice_read(
3123                                 struct nfsd4_compoundres *resp,
3124                                 struct nfsd4_read *read,
3125                                 struct file *file, unsigned long maxcount)
3126 {
3127         struct xdr_stream *xdr = &resp->xdr;
3128         struct xdr_buf *buf = xdr->buf;
3129         u32 eof;
3130         int space_left;
3131         __be32 nfserr;
3132         __be32 *p = xdr->p - 2;
3133
3134         /* Make sure there will be room for padding if needed */
3135         if (xdr->end - xdr->p < 1)
3136                 return nfserr_resource;
3137
3138         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3139                                   read->rd_offset, &maxcount);
3140         if (nfserr) {
3141                 /*
3142                  * nfsd_splice_actor may have already messed with the
3143                  * page length; reset it so as not to confuse
3144                  * xdr_truncate_encode:
3145                  */
3146                 buf->page_len = 0;
3147                 return nfserr;
3148         }
3149
3150         eof = (read->rd_offset + maxcount >=
3151                read->rd_fhp->fh_dentry->d_inode->i_size);
3152
3153         *(p++) = htonl(eof);
3154         *(p++) = htonl(maxcount);
3155
3156         buf->page_len = maxcount;
3157         buf->len += maxcount;
3158         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3159                                                         / PAGE_SIZE;
3160
3161         /* Use rest of head for padding and remaining ops: */
3162         buf->tail[0].iov_base = xdr->p;
3163         buf->tail[0].iov_len = 0;
3164         xdr->iov = buf->tail;
3165         if (maxcount&3) {
3166                 int pad = 4 - (maxcount&3);
3167
3168                 *(xdr->p++) = 0;
3169
3170                 buf->tail[0].iov_base += maxcount&3;
3171                 buf->tail[0].iov_len = pad;
3172                 buf->len += pad;
3173         }
3174
3175         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3176                                 buf->buflen - buf->len);
3177         buf->buflen = buf->len + space_left;
3178         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3179
3180         return 0;
3181 }
3182
3183 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3184                                  struct nfsd4_read *read,
3185                                  struct file *file, unsigned long maxcount)
3186 {
3187         struct xdr_stream *xdr = &resp->xdr;
3188         u32 eof;
3189         int v;
3190         int starting_len = xdr->buf->len - 8;
3191         long len;
3192         int thislen;
3193         __be32 nfserr;
3194         __be32 tmp;
3195         __be32 *p;
3196         u32 zzz = 0;
3197         int pad;
3198
3199         len = maxcount;
3200         v = 0;
3201
3202         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3203         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3204         WARN_ON_ONCE(!p);
3205         resp->rqstp->rq_vec[v].iov_base = p;
3206         resp->rqstp->rq_vec[v].iov_len = thislen;
3207         v++;
3208         len -= thislen;
3209
3210         while (len) {
3211                 thislen = min_t(long, len, PAGE_SIZE);
3212                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3213                 WARN_ON_ONCE(!p);
3214                 resp->rqstp->rq_vec[v].iov_base = p;
3215                 resp->rqstp->rq_vec[v].iov_len = thislen;
3216                 v++;
3217                 len -= thislen;
3218         }
3219         read->rd_vlen = v;
3220
3221         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3222                         read->rd_vlen, &maxcount);
3223         if (nfserr)
3224                 return nfserr;
3225         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3226
3227         eof = (read->rd_offset + maxcount >=
3228                read->rd_fhp->fh_dentry->d_inode->i_size);
3229
3230         tmp = htonl(eof);
3231         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3232         tmp = htonl(maxcount);
3233         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3234
3235         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3236         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3237                                                                 &zzz, pad);
3238         return 0;
3239
3240 }
3241
3242 static __be32
3243 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3244                   struct nfsd4_read *read)
3245 {
3246         unsigned long maxcount;
3247         struct xdr_stream *xdr = &resp->xdr;
3248         struct file *file = read->rd_filp;
3249         int starting_len = xdr->buf->len;
3250         struct raparms *ra;
3251         __be32 *p;
3252         __be32 err;
3253
3254         if (nfserr)
3255                 return nfserr;
3256
3257         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3258         if (!p) {
3259                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3260                 return nfserr_resource;
3261         }
3262         if (resp->xdr.buf->page_len && test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3263                 WARN_ON_ONCE(1);
3264                 return nfserr_resource;
3265         }
3266         xdr_commit_encode(xdr);
3267
3268         maxcount = svc_max_payload(resp->rqstp);
3269         maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len));
3270         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3271
3272         if (!read->rd_filp) {
3273                 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
3274                                                 &file, &ra);
3275                 if (err)
3276                         goto err_truncate;
3277         }
3278
3279         if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3280                 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
3281         else
3282                 err = nfsd4_encode_readv(resp, read, file, maxcount);
3283
3284         if (!read->rd_filp)
3285                 nfsd_put_tmp_read_open(file, ra);
3286
3287 err_truncate:
3288         if (err)
3289                 xdr_truncate_encode(xdr, starting_len);
3290         return err;
3291 }
3292
3293 static __be32
3294 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3295 {
3296         int maxcount;
3297         __be32 wire_count;
3298         int zero = 0;
3299         struct xdr_stream *xdr = &resp->xdr;
3300         int length_offset = xdr->buf->len;
3301         __be32 *p;
3302
3303         if (nfserr)
3304                 return nfserr;
3305
3306         p = xdr_reserve_space(xdr, 4);
3307         if (!p)
3308                 return nfserr_resource;
3309         maxcount = PAGE_SIZE;
3310
3311         p = xdr_reserve_space(xdr, maxcount);
3312         if (!p)
3313                 return nfserr_resource;
3314         /*
3315          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3316          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3317          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3318          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3319          */
3320         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3321                                                 (char *)p, &maxcount);
3322         if (nfserr == nfserr_isdir)
3323                 nfserr = nfserr_inval;
3324         if (nfserr) {
3325                 xdr_truncate_encode(xdr, length_offset);
3326                 return nfserr;
3327         }
3328
3329         wire_count = htonl(maxcount);
3330         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3331         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3332         if (maxcount & 3)
3333                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3334                                                 &zero, 4 - (maxcount&3));
3335         return 0;
3336 }
3337
3338 static __be32
3339 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3340 {
3341         int maxcount;
3342         int bytes_left;
3343         loff_t offset;
3344         __be64 wire_offset;
3345         struct xdr_stream *xdr = &resp->xdr;
3346         int starting_len = xdr->buf->len;
3347         __be32 *p;
3348
3349         if (nfserr)
3350                 return nfserr;
3351
3352         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3353         if (!p)
3354                 return nfserr_resource;
3355
3356         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3357         *p++ = cpu_to_be32(0);
3358         *p++ = cpu_to_be32(0);
3359         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3360                                 - (char *)resp->xdr.buf->head[0].iov_base;
3361
3362         /*
3363          * Number of bytes left for directory entries allowing for the
3364          * final 8 bytes of the readdir and a following failed op:
3365          */
3366         bytes_left = xdr->buf->buflen - xdr->buf->len
3367                         - COMPOUND_ERR_SLACK_SPACE - 8;
3368         if (bytes_left < 0) {
3369                 nfserr = nfserr_resource;
3370                 goto err_no_verf;
3371         }
3372         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3373         /*
3374          * Note the rfc defines rd_maxcount as the size of the
3375          * READDIR4resok structure, which includes the verifier above
3376          * and the 8 bytes encoded at the end of this function:
3377          */
3378         if (maxcount < 16) {
3379                 nfserr = nfserr_toosmall;
3380                 goto err_no_verf;
3381         }
3382         maxcount = min_t(int, maxcount-16, bytes_left);
3383
3384         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3385         if (!readdir->rd_dircount)
3386                 readdir->rd_dircount = INT_MAX;
3387
3388         readdir->xdr = xdr;
3389         readdir->rd_maxcount = maxcount;
3390         readdir->common.err = 0;
3391         readdir->cookie_offset = 0;
3392
3393         offset = readdir->rd_cookie;
3394         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3395                               &offset,
3396                               &readdir->common, nfsd4_encode_dirent);
3397         if (nfserr == nfs_ok &&
3398             readdir->common.err == nfserr_toosmall &&
3399             xdr->buf->len == starting_len + 8) {
3400                 /* nothing encoded; which limit did we hit?: */
3401                 if (maxcount - 16 < bytes_left)
3402                         /* It was the fault of rd_maxcount: */
3403                         nfserr = nfserr_toosmall;
3404                 else
3405                         /* We ran out of buffer space: */
3406                         nfserr = nfserr_resource;
3407         }
3408         if (nfserr)
3409                 goto err_no_verf;
3410
3411         if (readdir->cookie_offset) {
3412                 wire_offset = cpu_to_be64(offset);
3413                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3414                                                         &wire_offset, 8);
3415         }
3416
3417         p = xdr_reserve_space(xdr, 8);
3418         if (!p) {
3419                 WARN_ON_ONCE(1);
3420                 goto err_no_verf;
3421         }
3422         *p++ = 0;       /* no more entries */
3423         *p++ = htonl(readdir->common.err == nfserr_eof);
3424
3425         return 0;
3426 err_no_verf:
3427         xdr_truncate_encode(xdr, starting_len);
3428         return nfserr;
3429 }
3430
3431 static __be32
3432 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3433 {
3434         struct xdr_stream *xdr = &resp->xdr;
3435         __be32 *p;
3436
3437         if (!nfserr) {
3438                 p = xdr_reserve_space(xdr, 20);
3439                 if (!p)
3440                         return nfserr_resource;
3441                 p = encode_cinfo(p, &remove->rm_cinfo);
3442         }
3443         return nfserr;
3444 }
3445
3446 static __be32
3447 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3448 {
3449         struct xdr_stream *xdr = &resp->xdr;
3450         __be32 *p;
3451
3452         if (!nfserr) {
3453                 p = xdr_reserve_space(xdr, 40);
3454                 if (!p)
3455                         return nfserr_resource;
3456                 p = encode_cinfo(p, &rename->rn_sinfo);
3457                 p = encode_cinfo(p, &rename->rn_tinfo);
3458         }
3459         return nfserr;
3460 }
3461
3462 static __be32
3463 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3464                          __be32 nfserr, struct svc_export *exp)
3465 {
3466         u32 i, nflavs, supported;
3467         struct exp_flavor_info *flavs;
3468         struct exp_flavor_info def_flavs[2];
3469         __be32 *p, *flavorsp;
3470         static bool report = true;
3471
3472         if (nfserr)
3473                 goto out;
3474         nfserr = nfserr_resource;
3475         if (exp->ex_nflavors) {
3476                 flavs = exp->ex_flavors;
3477                 nflavs = exp->ex_nflavors;
3478         } else { /* Handling of some defaults in absence of real secinfo: */
3479                 flavs = def_flavs;
3480                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3481                         nflavs = 2;
3482                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3483                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3484                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3485                         nflavs = 1;
3486                         flavs[0].pseudoflavor
3487                                         = svcauth_gss_flavor(exp->ex_client);
3488                 } else {
3489                         nflavs = 1;
3490                         flavs[0].pseudoflavor
3491                                         = exp->ex_client->flavour->flavour;
3492                 }
3493         }
3494
3495         supported = 0;
3496         p = xdr_reserve_space(xdr, 4);
3497         if (!p)
3498                 goto out;
3499         flavorsp = p++;         /* to be backfilled later */
3500
3501         for (i = 0; i < nflavs; i++) {
3502                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3503                 struct rpcsec_gss_info info;
3504
3505                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3506                         supported++;
3507                         p = xdr_reserve_space(xdr, 4 + 4 +
3508                                               XDR_LEN(info.oid.len) + 4 + 4);
3509                         if (!p)
3510                                 goto out;
3511                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3512                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3513                         *p++ = cpu_to_be32(info.qop);
3514                         *p++ = cpu_to_be32(info.service);
3515                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3516                         supported++;
3517                         p = xdr_reserve_space(xdr, 4);
3518                         if (!p)
3519                                 goto out;
3520                         *p++ = cpu_to_be32(pf);
3521                 } else {
3522                         if (report)
3523                                 pr_warn("NFS: SECINFO: security flavor %u "
3524                                         "is not supported\n", pf);
3525                 }
3526         }
3527
3528         if (nflavs != supported)
3529                 report = false;
3530         *flavorsp = htonl(supported);
3531         nfserr = 0;
3532 out:
3533         if (exp)
3534                 exp_put(exp);
3535         return nfserr;
3536 }
3537
3538 static __be32
3539 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3540                      struct nfsd4_secinfo *secinfo)
3541 {
3542         struct xdr_stream *xdr = &resp->xdr;
3543
3544         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3545 }
3546
3547 static __be32
3548 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3549                      struct nfsd4_secinfo_no_name *secinfo)
3550 {
3551         struct xdr_stream *xdr = &resp->xdr;
3552
3553         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3554 }
3555
3556 /*
3557  * The SETATTR encode routine is special -- it always encodes a bitmap,
3558  * regardless of the error status.
3559  */
3560 static __be32
3561 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3562 {
3563         struct xdr_stream *xdr = &resp->xdr;
3564         __be32 *p;
3565
3566         p = xdr_reserve_space(xdr, 16);
3567         if (!p)
3568                 return nfserr_resource;
3569         if (nfserr) {
3570                 *p++ = cpu_to_be32(3);
3571                 *p++ = cpu_to_be32(0);
3572                 *p++ = cpu_to_be32(0);
3573                 *p++ = cpu_to_be32(0);
3574         }
3575         else {
3576                 *p++ = cpu_to_be32(3);
3577                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3578                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3579                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3580         }
3581         return nfserr;
3582 }
3583
3584 static __be32
3585 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3586 {
3587         struct xdr_stream *xdr = &resp->xdr;
3588         __be32 *p;
3589
3590         if (!nfserr) {
3591                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3592                 if (!p)
3593                         return nfserr_resource;
3594                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3595                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3596                                                 NFS4_VERIFIER_SIZE);
3597         }
3598         else if (nfserr == nfserr_clid_inuse) {
3599                 p = xdr_reserve_space(xdr, 8);
3600                 if (!p)
3601                         return nfserr_resource;
3602                 *p++ = cpu_to_be32(0);
3603                 *p++ = cpu_to_be32(0);
3604         }
3605         return nfserr;
3606 }
3607
3608 static __be32
3609 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3610 {
3611         struct xdr_stream *xdr = &resp->xdr;
3612         __be32 *p;
3613
3614         if (!nfserr) {
3615                 p = xdr_reserve_space(xdr, 16);
3616                 if (!p)
3617                         return nfserr_resource;
3618                 *p++ = cpu_to_be32(write->wr_bytes_written);
3619                 *p++ = cpu_to_be32(write->wr_how_written);
3620                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3621                                                         NFS4_VERIFIER_SIZE);
3622         }
3623         return nfserr;
3624 }
3625
3626 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3627         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3628               1 << (OP_EXCHANGE_ID - 32) |
3629               1 << (OP_CREATE_SESSION - 32) |
3630               1 << (OP_DESTROY_SESSION - 32) |
3631               1 << (OP_DESTROY_CLIENTID - 32)
3632 };
3633
3634 static __be32
3635 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3636                          struct nfsd4_exchange_id *exid)
3637 {
3638         struct xdr_stream *xdr = &resp->xdr;
3639         __be32 *p;
3640         char *major_id;
3641         char *server_scope;
3642         int major_id_sz;
3643         int server_scope_sz;
3644         uint64_t minor_id = 0;
3645
3646         if (nfserr)
3647                 return nfserr;
3648
3649         major_id = utsname()->nodename;
3650         major_id_sz = strlen(major_id);
3651         server_scope = utsname()->nodename;
3652         server_scope_sz = strlen(server_scope);
3653
3654         p = xdr_reserve_space(xdr,
3655                 8 /* eir_clientid */ +
3656                 4 /* eir_sequenceid */ +
3657                 4 /* eir_flags */ +
3658                 4 /* spr_how */);
3659         if (!p)
3660                 return nfserr_resource;
3661
3662         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3663         *p++ = cpu_to_be32(exid->seqid);
3664         *p++ = cpu_to_be32(exid->flags);
3665
3666         *p++ = cpu_to_be32(exid->spa_how);
3667
3668         switch (exid->spa_how) {
3669         case SP4_NONE:
3670                 break;
3671         case SP4_MACH_CRED:
3672                 /* spo_must_enforce, spo_must_allow */
3673                 p = xdr_reserve_space(xdr, 16);
3674                 if (!p)
3675                         return nfserr_resource;
3676
3677                 /* spo_must_enforce bitmap: */
3678                 *p++ = cpu_to_be32(2);
3679                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3680                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3681                 /* empty spo_must_allow bitmap: */
3682                 *p++ = cpu_to_be32(0);
3683
3684                 break;
3685         default:
3686                 WARN_ON_ONCE(1);
3687         }
3688
3689         p = xdr_reserve_space(xdr,
3690                 8 /* so_minor_id */ +
3691                 4 /* so_major_id.len */ +
3692                 (XDR_QUADLEN(major_id_sz) * 4) +
3693                 4 /* eir_server_scope.len */ +
3694                 (XDR_QUADLEN(server_scope_sz) * 4) +
3695                 4 /* eir_server_impl_id.count (0) */);
3696         if (!p)
3697                 return nfserr_resource;
3698
3699         /* The server_owner struct */
3700         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3701         /* major id */
3702         p = xdr_encode_opaque(p, major_id, major_id_sz);
3703
3704         /* Server scope */
3705         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3706
3707         /* Implementation id */
3708         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3709         return 0;
3710 }
3711
3712 static __be32
3713 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3714                             struct nfsd4_create_session *sess)
3715 {
3716         struct xdr_stream *xdr = &resp->xdr;
3717         __be32 *p;
3718
3719         if (nfserr)
3720                 return nfserr;
3721
3722         p = xdr_reserve_space(xdr, 24);
3723         if (!p)
3724                 return nfserr_resource;
3725         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3726                                         NFS4_MAX_SESSIONID_LEN);
3727         *p++ = cpu_to_be32(sess->seqid);
3728         *p++ = cpu_to_be32(sess->flags);
3729
3730         p = xdr_reserve_space(xdr, 28);
3731         if (!p)
3732                 return nfserr_resource;
3733         *p++ = cpu_to_be32(0); /* headerpadsz */
3734         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3735         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3736         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3737         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3738         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3739         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3740
3741         if (sess->fore_channel.nr_rdma_attrs) {
3742                 p = xdr_reserve_space(xdr, 4);
3743                 if (!p)
3744                         return nfserr_resource;
3745                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3746         }
3747
3748         p = xdr_reserve_space(xdr, 28);
3749         if (!p)
3750                 return nfserr_resource;
3751         *p++ = cpu_to_be32(0); /* headerpadsz */
3752         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3753         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3754         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3755         *p++ = cpu_to_be32(sess->back_channel.maxops);
3756         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3757         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3758
3759         if (sess->back_channel.nr_rdma_attrs) {
3760                 p = xdr_reserve_space(xdr, 4);
3761                 if (!p)
3762                         return nfserr_resource;
3763                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3764         }
3765         return 0;
3766 }
3767
3768 static __be32
3769 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3770                       struct nfsd4_sequence *seq)
3771 {
3772         struct xdr_stream *xdr = &resp->xdr;
3773         __be32 *p;
3774
3775         if (nfserr)
3776                 return nfserr;
3777
3778         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3779         if (!p)
3780                 return nfserr_resource;
3781         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
3782                                         NFS4_MAX_SESSIONID_LEN);
3783         *p++ = cpu_to_be32(seq->seqid);
3784         *p++ = cpu_to_be32(seq->slotid);
3785         /* Note slotid's are numbered from zero: */
3786         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
3787         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
3788         *p++ = cpu_to_be32(seq->status_flags);
3789
3790         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3791         return 0;
3792 }
3793
3794 static __be32
3795 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3796                           struct nfsd4_test_stateid *test_stateid)
3797 {
3798         struct xdr_stream *xdr = &resp->xdr;
3799         struct nfsd4_test_stateid_id *stateid, *next;
3800         __be32 *p;
3801
3802         if (nfserr)
3803                 return nfserr;
3804
3805         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3806         if (!p)
3807                 return nfserr_resource;
3808         *p++ = htonl(test_stateid->ts_num_ids);
3809
3810         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3811                 *p++ = stateid->ts_id_status;
3812         }
3813
3814         return nfserr;
3815 }
3816
3817 static __be32
3818 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
3819                   struct nfsd4_seek *seek)
3820 {
3821         __be32 *p;
3822
3823         if (nfserr)
3824                 return nfserr;
3825
3826         p = xdr_reserve_space(&resp->xdr, 4 + 8);
3827         *p++ = cpu_to_be32(seek->seek_eof);
3828         p = xdr_encode_hyper(p, seek->seek_pos);
3829
3830         return nfserr;
3831 }
3832
3833 static __be32
3834 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3835 {
3836         return nfserr;
3837 }
3838
3839 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3840
3841 /*
3842  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3843  * since we don't need to filter out obsolete ops as this is
3844  * done in the decoding phase.
3845  */
3846 static nfsd4_enc nfsd4_enc_ops[] = {
3847         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3848         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3849         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3850         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3851         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3852         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3853         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3854         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3855         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3856         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3857         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3858         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3859         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3860         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3861         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3862         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3863         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3864         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3865         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3866         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3867         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3868         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3869         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3870         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3871         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3872         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3873         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3874         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3875         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3876         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3877         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3878         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3879         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3880         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3881         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3882         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3883         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3884
3885         /* NFSv4.1 operations */
3886         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3887         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3888         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3889         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3890         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
3891         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3892         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3893         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3894         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3895         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3896         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3897         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3898         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3899         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3900         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3901         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3902         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3903         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3904         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3905
3906         /* NFSv4.2 operations */
3907         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
3908         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_noop,
3909         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
3910         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
3911         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
3912         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
3913         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
3914         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
3915         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
3916         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
3917         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
3918         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
3919 };
3920
3921 /*
3922  * Calculate whether we still have space to encode repsize bytes.
3923  * There are two considerations:
3924  *     - For NFS versions >=4.1, the size of the reply must stay within
3925  *       session limits
3926  *     - For all NFS versions, we must stay within limited preallocated
3927  *       buffer space.
3928  *
3929  * This is called before the operation is processed, so can only provide
3930  * an upper estimate.  For some nonidempotent operations (such as
3931  * getattr), it's not necessarily a problem if that estimate is wrong,
3932  * as we can fail it after processing without significant side effects.
3933  */
3934 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
3935 {
3936         struct xdr_buf *buf = &resp->rqstp->rq_res;
3937         struct nfsd4_slot *slot = resp->cstate.slot;
3938
3939         if (buf->len + respsize <= buf->buflen)
3940                 return nfs_ok;
3941         if (!nfsd4_has_session(&resp->cstate))
3942                 return nfserr_resource;
3943         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
3944                 WARN_ON_ONCE(1);
3945                 return nfserr_rep_too_big_to_cache;
3946         }
3947         return nfserr_rep_too_big;
3948 }
3949
3950 void
3951 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3952 {
3953         struct xdr_stream *xdr = &resp->xdr;
3954         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3955         struct svc_rqst *rqstp = resp->rqstp;
3956         int post_err_offset;
3957         nfsd4_enc encoder;
3958         __be32 *p;
3959
3960         p = xdr_reserve_space(xdr, 8);
3961         if (!p) {
3962                 WARN_ON_ONCE(1);
3963                 return;
3964         }
3965         *p++ = cpu_to_be32(op->opnum);
3966         post_err_offset = xdr->buf->len;
3967
3968         if (op->opnum == OP_ILLEGAL)
3969                 goto status;
3970         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3971                !nfsd4_enc_ops[op->opnum]);
3972         encoder = nfsd4_enc_ops[op->opnum];
3973         op->status = encoder(resp, op->status, &op->u);
3974         xdr_commit_encode(xdr);
3975
3976         /* nfsd4_check_resp_size guarantees enough room for error status */
3977         if (!op->status) {
3978                 int space_needed = 0;
3979                 if (!nfsd4_last_compound_op(rqstp))
3980                         space_needed = COMPOUND_ERR_SLACK_SPACE;
3981                 op->status = nfsd4_check_resp_size(resp, space_needed);
3982         }
3983         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
3984                 struct nfsd4_slot *slot = resp->cstate.slot;
3985
3986                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
3987                         op->status = nfserr_rep_too_big_to_cache;
3988                 else
3989                         op->status = nfserr_rep_too_big;
3990         }
3991         if (op->status == nfserr_resource ||
3992             op->status == nfserr_rep_too_big ||
3993             op->status == nfserr_rep_too_big_to_cache) {
3994                 /*
3995                  * The operation may have already been encoded or
3996                  * partially encoded.  No op returns anything additional
3997                  * in the case of one of these three errors, so we can
3998                  * just truncate back to after the status.  But it's a
3999                  * bug if we had to do this on a non-idempotent op:
4000                  */
4001                 warn_on_nonidempotent_op(op);
4002                 xdr_truncate_encode(xdr, post_err_offset);
4003         }
4004         if (so) {
4005                 int len = xdr->buf->len - post_err_offset;
4006
4007                 so->so_replay.rp_status = op->status;
4008                 so->so_replay.rp_buflen = len;
4009                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4010                                                 so->so_replay.rp_buf, len);
4011         }
4012 status:
4013         /* Note that op->status is already in network byte order: */
4014         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4015 }
4016
4017 /*
4018  * Encode the reply stored in the stateowner reply cache
4019  *
4020  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4021  * previously sent already encoded operation.
4022  */
4023 void
4024 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4025 {
4026         __be32 *p;
4027         struct nfs4_replay *rp = op->replay;
4028
4029         BUG_ON(!rp);
4030
4031         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4032         if (!p) {
4033                 WARN_ON_ONCE(1);
4034                 return;
4035         }
4036         *p++ = cpu_to_be32(op->opnum);
4037         *p++ = rp->rp_status;  /* already xdr'ed */
4038
4039         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4040 }
4041
4042 int
4043 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4044 {
4045         return xdr_ressize_check(rqstp, p);
4046 }
4047
4048 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4049 {
4050         struct svc_rqst *rqstp = rq;
4051         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4052
4053         if (args->ops != args->iops) {
4054                 kfree(args->ops);
4055                 args->ops = args->iops;
4056         }
4057         kfree(args->tmpp);
4058         args->tmpp = NULL;
4059         while (args->to_free) {
4060                 struct svcxdr_tmpbuf *tb = args->to_free;
4061                 args->to_free = tb->next;
4062                 kfree(tb);
4063         }
4064         return 1;
4065 }
4066
4067 int
4068 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4069 {
4070         if (rqstp->rq_arg.head[0].iov_len % 4) {
4071                 /* client is nuts */
4072                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4073                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4074                 return 0;
4075         }
4076         args->p = p;
4077         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4078         args->pagelist = rqstp->rq_arg.pages;
4079         args->pagelen = rqstp->rq_arg.page_len;
4080         args->tmpp = NULL;
4081         args->to_free = NULL;
4082         args->ops = args->iops;
4083         args->rqstp = rqstp;
4084
4085         return !nfsd4_decode_compound(args);
4086 }
4087
4088 int
4089 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4090 {
4091         /*
4092          * All that remains is to write the tag and operation count...
4093          */
4094         struct xdr_buf *buf = resp->xdr.buf;
4095
4096         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4097                                  buf->tail[0].iov_len);
4098
4099         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4100
4101         p = resp->tagp;
4102         *p++ = htonl(resp->taglen);
4103         memcpy(p, resp->tag, resp->taglen);
4104         p += XDR_QUADLEN(resp->taglen);
4105         *p++ = htonl(resp->opcnt);
4106
4107         nfsd4_sequence_done(resp);
4108         return 1;
4109 }
4110
4111 /*
4112  * Local variables:
4113  *  c-basic-offset: 8
4114  * End:
4115  */