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/file.h>
  37 #include <linux/slab.h>
  38 #include <linux/namei.h>
  39 #include <linux/statfs.h>
  40 #include <linux/utsname.h>
  41 #include <linux/pagemap.h>
  42 #include <linux/sunrpc/svcauth_gss.h>
  43
  44 #include "idmap.h"
  45 #include "acl.h"
  46 #include "xdr4.h"
  47 #include "vfs.h"
  48 #include "state.h"
  49 #include "cache.h"
  50 #include "netns.h"
  51 #include "pnfs.h"
  52
  53 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  54 #include <linux/security.h>
  55 #endif
  56
  57
  58 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  59
  60 const u32 nfsd_suppattrs[3][3] = {
  61         {NFSD4_SUPPORTED_ATTRS_WORD0,
  62          NFSD4_SUPPORTED_ATTRS_WORD1,
  63          NFSD4_SUPPORTED_ATTRS_WORD2},
  64
  65         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  66          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  67          NFSD4_1_SUPPORTED_ATTRS_WORD2},
  68
  69         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  70          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  71          NFSD4_2_SUPPORTED_ATTRS_WORD2},
  72 };
  73
  74 /*
  75  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  76  * directory in order to indicate to the client that a filesystem boundary is present
  77  * We use a fixed fsid for a referral
  78  */
  79 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  80 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  81
  82 static __be32
  83 check_filename(char *str, int len)
  84 {
  85         int i;
  86
  87         if (len == 0)
  88                 return nfserr_inval;
  89         if (isdotent(str, len))
  90                 return nfserr_badname;
  91         for (i = 0; i < len; i++)
  92                 if (str[i] == '/')
  93                         return nfserr_badname;
  94         return 0;
  95 }
  96
  97 #define DECODE_HEAD                             \
  98         __be32 *p;                              \
  99         __be32 status
 100 #define DECODE_TAIL                             \
 101         status = 0;                             \
 102 out:                                            \
 103         return status;                          \
 104 xdr_error:                                      \
 105         dprintk("NFSD: xdr error (%s:%d)\n",    \
 106                         __FILE__, __LINE__);    \
 107         status = nfserr_bad_xdr;                \
 108         goto out
 109
 110 #define READMEM(x,nbytes) do {                  \
 111         x = (char *)p;                          \
 112         p += XDR_QUADLEN(nbytes);               \
 113 } while (0)
 114 #define SAVEMEM(x,nbytes) do {                  \
 115         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 116                 savemem(argp, p, nbytes) :      \
 117                 (char *)p)) {                   \
 118                 dprintk("NFSD: xdr error (%s:%d)\n", \
 119                                 __FILE__, __LINE__); \
 120                 goto xdr_error;                 \
 121                 }                               \
 122         p += XDR_QUADLEN(nbytes);               \
 123 } while (0)
 124 #define COPYMEM(x,nbytes) do {                  \
 125         memcpy((x), p, nbytes);                 \
 126         p += XDR_QUADLEN(nbytes);               \
 127 } while (0)
 128
 129 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 130 #define READ_BUF(nbytes)  do {                  \
 131         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 132                 p = argp->p;                    \
 133                 argp->p += XDR_QUADLEN(nbytes); \
 134         } else if (!(p = read_buf(argp, nbytes))) { \
 135                 dprintk("NFSD: xdr error (%s:%d)\n", \
 136                                 __FILE__, __LINE__); \
 137                 goto xdr_error;                 \
 138         }                                       \
 139 } while (0)
 140
 141 static void next_decode_page(struct nfsd4_compoundargs *argp)
 142 {
 143         argp->p = page_address(argp->pagelist[0]);
 144         argp->pagelist++;
 145         if (argp->pagelen < PAGE_SIZE) {
 146                 argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
 147                 argp->pagelen = 0;
 148         } else {
 149                 argp->end = argp->p + (PAGE_SIZE>>2);
 150                 argp->pagelen -= PAGE_SIZE;
 151         }
 152 }
 153
 154 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 155 {
 156         /* We want more bytes than seem to be available.
 157          * Maybe we need a new page, maybe we have just run out
 158          */
 159         unsigned int avail = (char *)argp->end - (char *)argp->p;
 160         __be32 *p;
 161
 162         if (argp->pagelen == 0) {
 163                 struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
 164
 165                 if (!argp->tail) {
 166                         argp->tail = true;
 167                         avail = vec->iov_len;
 168                         argp->p = vec->iov_base;
 169                         argp->end = vec->iov_base + avail;
 170                 }
 171
 172                 if (avail < nbytes)
 173                         return NULL;
 174
 175                 p = argp->p;
 176                 argp->p += XDR_QUADLEN(nbytes);
 177                 return p;
 178         }
 179
 180         if (avail + argp->pagelen < nbytes)
 181                 return NULL;
 182         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 183                 return NULL;
 184         /* ok, we can do it with the current plus the next page */
 185         if (nbytes <= sizeof(argp->tmp))
 186                 p = argp->tmp;
 187         else {
 188                 kfree(argp->tmpp);
 189                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 190                 if (!p)
 191                         return NULL;
 192
 193         }
 194         /*
 195          * The following memcpy is safe because read_buf is always
 196          * called with nbytes > avail, and the two cases above both
 197          * guarantee p points to at least nbytes bytes.
 198          */
 199         memcpy(p, argp->p, avail);
 200         next_decode_page(argp);
 201         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 202         argp->p += XDR_QUADLEN(nbytes - avail);
 203         return p;
 204 }
 205
 206 static int zero_clientid(clientid_t *clid)
 207 {
 208         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 209 }
 210
 211 /**
 212  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 213  * @argp: NFSv4 compound argument structure
 214  * @p: pointer to be freed (with kfree())
 215  *
 216  * Marks @p to be freed when processing the compound operation
 217  * described in @argp finishes.
 218  */
 219 static void *
 220 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 221 {
 222         struct svcxdr_tmpbuf *tb;
 223
 224         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 225         if (!tb)
 226                 return NULL;
 227         tb->next = argp->to_free;
 228         argp->to_free = tb;
 229         return tb->buf;
 230 }
 231
 232 /*
 233  * For xdr strings that need to be passed to other kernel api's
 234  * as null-terminated strings.
 235  *
 236  * Note null-terminating in place usually isn't safe since the
 237  * buffer might end on a page boundary.
 238  */
 239 static char *
 240 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 241 {
 242         char *p = svcxdr_tmpalloc(argp, len + 1);
 243
 244         if (!p)
 245                 return NULL;
 246         memcpy(p, buf, len);
 247         p[len] = '\0';
 248         return p;
 249 }
 250
 251 /**
 252  * savemem - duplicate a chunk of memory for later processing
 253  * @argp: NFSv4 compound argument structure to be freed with
 254  * @p: pointer to be duplicated
 255  * @nbytes: length to be duplicated
 256  *
 257  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 258  * that are preserved until processing of the NFSv4 compound
 259  * operation described by @argp finishes.
 260  */
 261 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 262 {
 263         void *ret;
 264
 265         ret = svcxdr_tmpalloc(argp, nbytes);
 266         if (!ret)
 267                 return NULL;
 268         memcpy(ret, p, nbytes);
 269         return ret;
 270 }
 271
 272 /*
 273  * We require the high 32 bits of 'seconds' to be 0, and
 274  * we ignore all 32 bits of 'nseconds'.
 275  */
 276 static __be32
 277 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
 278 {
 279         DECODE_HEAD;
 280         u64 sec;
 281
 282         READ_BUF(12);
 283         p = xdr_decode_hyper(p, &sec);
 284         tv->tv_sec = sec;
 285         tv->tv_nsec = be32_to_cpup(p++);
 286         if (tv->tv_nsec >= (u32)1000000000)
 287                 return nfserr_inval;
 288
 289         DECODE_TAIL;
 290 }
 291
 292 static __be32
 293 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 294 {
 295         u32 bmlen;
 296         DECODE_HEAD;
 297
 298         bmval[0] = 0;
 299         bmval[1] = 0;
 300         bmval[2] = 0;
 301
 302         READ_BUF(4);
 303         bmlen = be32_to_cpup(p++);
 304         if (bmlen > 1000)
 305                 goto xdr_error;
 306
 307         READ_BUF(bmlen << 2);
 308         if (bmlen > 0)
 309                 bmval[0] = be32_to_cpup(p++);
 310         if (bmlen > 1)
 311                 bmval[1] = be32_to_cpup(p++);
 312         if (bmlen > 2)
 313                 bmval[2] = be32_to_cpup(p++);
 314
 315         DECODE_TAIL;
 316 }
 317
 318 static __be32
 319 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 320                    struct iattr *iattr, struct nfs4_acl **acl,
 321                    struct xdr_netobj *label, int *umask)
 322 {
 323         struct timespec ts;
 324         int expected_len, len = 0;
 325         u32 dummy32;
 326         char *buf;
 327
 328         DECODE_HEAD;
 329         iattr->ia_valid = 0;
 330         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 331                 return status;
 332
 333         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 334             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 335             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
 336                 if (nfsd_attrs_supported(argp->minorversion, bmval))
 337                         return nfserr_inval;
 338                 return nfserr_attrnotsupp;
 339         }
 340
 341         READ_BUF(4);
 342         expected_len = be32_to_cpup(p++);
 343
 344         if (bmval[0] & FATTR4_WORD0_SIZE) {
 345                 READ_BUF(8);
 346                 len += 8;
 347                 p = xdr_decode_hyper(p, &iattr->ia_size);
 348                 iattr->ia_valid |= ATTR_SIZE;
 349         }
 350         if (bmval[0] & FATTR4_WORD0_ACL) {
 351                 u32 nace;
 352                 struct nfs4_ace *ace;
 353
 354                 READ_BUF(4); len += 4;
 355                 nace = be32_to_cpup(p++);
 356
 357                 if (nace > NFS4_ACL_MAX)
 358                         return nfserr_fbig;
 359
 360                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
 361                 if (*acl == NULL)
 362                         return nfserr_jukebox;
 363
 364                 (*acl)->naces = nace;
 365                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 366                         READ_BUF(16); len += 16;
 367                         ace->type = be32_to_cpup(p++);
 368                         ace->flag = be32_to_cpup(p++);
 369                         ace->access_mask = be32_to_cpup(p++);
 370                         dummy32 = be32_to_cpup(p++);
 371                         READ_BUF(dummy32);
 372                         len += XDR_QUADLEN(dummy32) << 2;
 373                         READMEM(buf, dummy32);
 374                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 375                         status = nfs_ok;
 376                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 377                                 ;
 378                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 379                                 status = nfsd_map_name_to_gid(argp->rqstp,
 380                                                 buf, dummy32, &ace->who_gid);
 381                         else
 382                                 status = nfsd_map_name_to_uid(argp->rqstp,
 383                                                 buf, dummy32, &ace->who_uid);
 384                         if (status)
 385                                 return status;
 386                 }
 387         } else
 388                 *acl = NULL;
 389         if (bmval[1] & FATTR4_WORD1_MODE) {
 390                 READ_BUF(4);
 391                 len += 4;
 392                 iattr->ia_mode = be32_to_cpup(p++);
 393                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 394                 iattr->ia_valid |= ATTR_MODE;
 395         }
 396         if (bmval[1] & FATTR4_WORD1_OWNER) {
 397                 READ_BUF(4);
 398                 len += 4;
 399                 dummy32 = be32_to_cpup(p++);
 400                 READ_BUF(dummy32);
 401                 len += (XDR_QUADLEN(dummy32) << 2);
 402                 READMEM(buf, dummy32);
 403                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 404                         return status;
 405                 iattr->ia_valid |= ATTR_UID;
 406         }
 407         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 408                 READ_BUF(4);
 409                 len += 4;
 410                 dummy32 = be32_to_cpup(p++);
 411                 READ_BUF(dummy32);
 412                 len += (XDR_QUADLEN(dummy32) << 2);
 413                 READMEM(buf, dummy32);
 414                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 415                         return status;
 416                 iattr->ia_valid |= ATTR_GID;
 417         }
 418         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 419                 READ_BUF(4);
 420                 len += 4;
 421                 dummy32 = be32_to_cpup(p++);
 422                 switch (dummy32) {
 423                 case NFS4_SET_TO_CLIENT_TIME:
 424                         len += 12;
 425                         status = nfsd4_decode_time(argp, &ts);
 426                         iattr->ia_atime = timespec_to_timespec64(ts);
 427                         if (status)
 428                                 return status;
 429                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 430                         break;
 431                 case NFS4_SET_TO_SERVER_TIME:
 432                         iattr->ia_valid |= ATTR_ATIME;
 433                         break;
 434                 default:
 435                         goto xdr_error;
 436                 }
 437         }
 438         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 439                 READ_BUF(4);
 440                 len += 4;
 441                 dummy32 = be32_to_cpup(p++);
 442                 switch (dummy32) {
 443                 case NFS4_SET_TO_CLIENT_TIME:
 444                         len += 12;
 445                         status = nfsd4_decode_time(argp, &ts);
 446                         iattr->ia_mtime = timespec_to_timespec64(ts);
 447                         if (status)
 448                                 return status;
 449                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 450                         break;
 451                 case NFS4_SET_TO_SERVER_TIME:
 452                         iattr->ia_valid |= ATTR_MTIME;
 453                         break;
 454                 default:
 455                         goto xdr_error;
 456                 }
 457         }
 458
 459         label->len = 0;
 460         if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
 461             bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 462                 READ_BUF(4);
 463                 len += 4;
 464                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 465                 READ_BUF(4);
 466                 len += 4;
 467                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 468                 READ_BUF(4);
 469                 len += 4;
 470                 dummy32 = be32_to_cpup(p++);
 471                 READ_BUF(dummy32);
 472                 if (dummy32 > NFS4_MAXLABELLEN)
 473                         return nfserr_badlabel;
 474                 len += (XDR_QUADLEN(dummy32) << 2);
 475                 READMEM(buf, dummy32);
 476                 label->len = dummy32;
 477                 label->data = svcxdr_dupstr(argp, buf, dummy32);
 478                 if (!label->data)
 479                         return nfserr_jukebox;
 480         }
 481         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
 482                 if (!umask)
 483                         goto xdr_error;
 484                 READ_BUF(8);
 485                 len += 8;
 486                 dummy32 = be32_to_cpup(p++);
 487                 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
 488                 dummy32 = be32_to_cpup(p++);
 489                 *umask = dummy32 & S_IRWXUGO;
 490                 iattr->ia_valid |= ATTR_MODE;
 491         }
 492         if (len != expected_len)
 493                 goto xdr_error;
 494
 495         DECODE_TAIL;
 496 }
 497
 498 static __be32
 499 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 500 {
 501         DECODE_HEAD;
 502
 503         READ_BUF(sizeof(stateid_t));
 504         sid->si_generation = be32_to_cpup(p++);
 505         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 506
 507         DECODE_TAIL;
 508 }
 509
 510 static __be32
 511 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 512 {
 513         DECODE_HEAD;
 514
 515         READ_BUF(4);
 516         access->ac_req_access = be32_to_cpup(p++);
 517
 518         DECODE_TAIL;
 519 }
 520
 521 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 522 {
 523         DECODE_HEAD;
 524         u32 dummy, uid, gid;
 525         char *machine_name;
 526         int i;
 527         int nr_secflavs;
 528
 529         /* callback_sec_params4 */
 530         READ_BUF(4);
 531         nr_secflavs = be32_to_cpup(p++);
 532         if (nr_secflavs)
 533                 cbs->flavor = (u32)(-1);
 534         else
 535                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 536                 cbs->flavor = 0;
 537         for (i = 0; i < nr_secflavs; ++i) {
 538                 READ_BUF(4);
 539                 dummy = be32_to_cpup(p++);
 540                 switch (dummy) {
 541                 case RPC_AUTH_NULL:
 542                         /* Nothing to read */
 543                         if (cbs->flavor == (u32)(-1))
 544                                 cbs->flavor = RPC_AUTH_NULL;
 545                         break;
 546                 case RPC_AUTH_UNIX:
 547                         READ_BUF(8);
 548                         /* stamp */
 549                         dummy = be32_to_cpup(p++);
 550
 551                         /* machine name */
 552                         dummy = be32_to_cpup(p++);
 553                         READ_BUF(dummy);
 554                         SAVEMEM(machine_name, dummy);
 555
 556                         /* uid, gid */
 557                         READ_BUF(8);
 558                         uid = be32_to_cpup(p++);
 559                         gid = be32_to_cpup(p++);
 560
 561                         /* more gids */
 562                         READ_BUF(4);
 563                         dummy = be32_to_cpup(p++);
 564                         READ_BUF(dummy * 4);
 565                         if (cbs->flavor == (u32)(-1)) {
 566                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 567                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 568                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 569                                         cbs->uid = kuid;
 570                                         cbs->gid = kgid;
 571                                         cbs->flavor = RPC_AUTH_UNIX;
 572                                 } else {
 573                                         dprintk("RPC_AUTH_UNIX with invalid"
 574                                                 "uid or gid ignoring!\n");
 575                                 }
 576                         }
 577                         break;
 578                 case RPC_AUTH_GSS:
 579                         dprintk("RPC_AUTH_GSS callback secflavor "
 580                                 "not supported!\n");
 581                         READ_BUF(8);
 582                         /* gcbp_service */
 583                         dummy = be32_to_cpup(p++);
 584                         /* gcbp_handle_from_server */
 585                         dummy = be32_to_cpup(p++);
 586                         READ_BUF(dummy);
 587                         p += XDR_QUADLEN(dummy);
 588                         /* gcbp_handle_from_client */
 589                         READ_BUF(4);
 590                         dummy = be32_to_cpup(p++);
 591                         READ_BUF(dummy);
 592                         break;
 593                 default:
 594                         dprintk("Illegal callback secflavor\n");
 595                         return nfserr_inval;
 596                 }
 597         }
 598         DECODE_TAIL;
 599 }
 600
 601 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 602 {
 603         DECODE_HEAD;
 604
 605         READ_BUF(4);
 606         bc->bc_cb_program = be32_to_cpup(p++);
 607         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 608
 609         DECODE_TAIL;
 610 }
 611
 612 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 613 {
 614         DECODE_HEAD;
 615
 616         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 617         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 618         bcts->dir = be32_to_cpup(p++);
 619         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 620          * could help us figure out we should be using it. */
 621         DECODE_TAIL;
 622 }
 623
 624 static __be32
 625 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 626 {
 627         DECODE_HEAD;
 628
 629         READ_BUF(4);
 630         close->cl_seqid = be32_to_cpup(p++);
 631         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 632
 633         DECODE_TAIL;
 634 }
 635
 636
 637 static __be32
 638 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 639 {
 640         DECODE_HEAD;
 641
 642         READ_BUF(12);
 643         p = xdr_decode_hyper(p, &commit->co_offset);
 644         commit->co_count = be32_to_cpup(p++);
 645
 646         DECODE_TAIL;
 647 }
 648
 649 static __be32
 650 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 651 {
 652         DECODE_HEAD;
 653
 654         READ_BUF(4);
 655         create->cr_type = be32_to_cpup(p++);
 656         switch (create->cr_type) {
 657         case NF4LNK:
 658                 READ_BUF(4);
 659                 create->cr_datalen = be32_to_cpup(p++);
 660                 READ_BUF(create->cr_datalen);
 661                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 662                 if (!create->cr_data)
 663                         return nfserr_jukebox;
 664                 break;
 665         case NF4BLK:
 666         case NF4CHR:
 667                 READ_BUF(8);
 668                 create->cr_specdata1 = be32_to_cpup(p++);
 669                 create->cr_specdata2 = be32_to_cpup(p++);
 670                 break;
 671         case NF4SOCK:
 672         case NF4FIFO:
 673         case NF4DIR:
 674         default:
 675                 break;
 676         }
 677
 678         READ_BUF(4);
 679         create->cr_namelen = be32_to_cpup(p++);
 680         READ_BUF(create->cr_namelen);
 681         SAVEMEM(create->cr_name, create->cr_namelen);
 682         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 683                 return status;
 684
 685         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 686                                     &create->cr_acl, &create->cr_label,
 687                                     &create->cr_umask);
 688         if (status)
 689                 goto out;
 690
 691         DECODE_TAIL;
 692 }
 693
 694 static inline __be32
 695 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 696 {
 697         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 698 }
 699
 700 static inline __be32
 701 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 702 {
 703         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 704 }
 705
 706 static __be32
 707 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 708 {
 709         DECODE_HEAD;
 710
 711         READ_BUF(4);
 712         link->li_namelen = be32_to_cpup(p++);
 713         READ_BUF(link->li_namelen);
 714         SAVEMEM(link->li_name, link->li_namelen);
 715         if ((status = check_filename(link->li_name, link->li_namelen)))
 716                 return status;
 717
 718         DECODE_TAIL;
 719 }
 720
 721 static __be32
 722 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 723 {
 724         DECODE_HEAD;
 725
 726         /*
 727         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 728         */
 729         READ_BUF(28);
 730         lock->lk_type = be32_to_cpup(p++);
 731         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 732                 goto xdr_error;
 733         lock->lk_reclaim = be32_to_cpup(p++);
 734         p = xdr_decode_hyper(p, &lock->lk_offset);
 735         p = xdr_decode_hyper(p, &lock->lk_length);
 736         lock->lk_is_new = be32_to_cpup(p++);
 737
 738         if (lock->lk_is_new) {
 739                 READ_BUF(4);
 740                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 741                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 742                 if (status)
 743                         return status;
 744                 READ_BUF(8 + sizeof(clientid_t));
 745                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 746                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 747                 lock->lk_new_owner.len = be32_to_cpup(p++);
 748                 READ_BUF(lock->lk_new_owner.len);
 749                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 750         } else {
 751                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 752                 if (status)
 753                         return status;
 754                 READ_BUF(4);
 755                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 756         }
 757
 758         DECODE_TAIL;
 759 }
 760
 761 static __be32
 762 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 763 {
 764         DECODE_HEAD;
 765
 766         READ_BUF(32);
 767         lockt->lt_type = be32_to_cpup(p++);
 768         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 769                 goto xdr_error;
 770         p = xdr_decode_hyper(p, &lockt->lt_offset);
 771         p = xdr_decode_hyper(p, &lockt->lt_length);
 772         COPYMEM(&lockt->lt_clientid, 8);
 773         lockt->lt_owner.len = be32_to_cpup(p++);
 774         READ_BUF(lockt->lt_owner.len);
 775         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 776
 777         DECODE_TAIL;
 778 }
 779
 780 static __be32
 781 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 782 {
 783         DECODE_HEAD;
 784
 785         READ_BUF(8);
 786         locku->lu_type = be32_to_cpup(p++);
 787         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 788                 goto xdr_error;
 789         locku->lu_seqid = be32_to_cpup(p++);
 790         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 791         if (status)
 792                 return status;
 793         READ_BUF(16);
 794         p = xdr_decode_hyper(p, &locku->lu_offset);
 795         p = xdr_decode_hyper(p, &locku->lu_length);
 796
 797         DECODE_TAIL;
 798 }
 799
 800 static __be32
 801 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 802 {
 803         DECODE_HEAD;
 804
 805         READ_BUF(4);
 806         lookup->lo_len = be32_to_cpup(p++);
 807         READ_BUF(lookup->lo_len);
 808         SAVEMEM(lookup->lo_name, lookup->lo_len);
 809         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 810                 return status;
 811
 812         DECODE_TAIL;
 813 }
 814
 815 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 816 {
 817         __be32 *p;
 818         u32 w;
 819
 820         READ_BUF(4);
 821         w = be32_to_cpup(p++);
 822         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 823         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 824         if (deleg_when)
 825                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 826
 827         switch (w & NFS4_SHARE_ACCESS_MASK) {
 828         case NFS4_SHARE_ACCESS_READ:
 829         case NFS4_SHARE_ACCESS_WRITE:
 830         case NFS4_SHARE_ACCESS_BOTH:
 831                 break;
 832         default:
 833                 return nfserr_bad_xdr;
 834         }
 835         w &= ~NFS4_SHARE_ACCESS_MASK;
 836         if (!w)
 837                 return nfs_ok;
 838         if (!argp->minorversion)
 839                 return nfserr_bad_xdr;
 840         switch (w & NFS4_SHARE_WANT_MASK) {
 841         case NFS4_SHARE_WANT_NO_PREFERENCE:
 842         case NFS4_SHARE_WANT_READ_DELEG:
 843         case NFS4_SHARE_WANT_WRITE_DELEG:
 844         case NFS4_SHARE_WANT_ANY_DELEG:
 845         case NFS4_SHARE_WANT_NO_DELEG:
 846         case NFS4_SHARE_WANT_CANCEL:
 847                 break;
 848         default:
 849                 return nfserr_bad_xdr;
 850         }
 851         w &= ~NFS4_SHARE_WANT_MASK;
 852         if (!w)
 853                 return nfs_ok;
 854
 855         if (!deleg_when)        /* open_downgrade */
 856                 return nfserr_inval;
 857         switch (w) {
 858         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 859         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 860         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 861               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 862                 return nfs_ok;
 863         }
 864 xdr_error:
 865         return nfserr_bad_xdr;
 866 }
 867
 868 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 869 {
 870         __be32 *p;
 871
 872         READ_BUF(4);
 873         *x = be32_to_cpup(p++);
 874         /* Note: unlinke access bits, deny bits may be zero. */
 875         if (*x & ~NFS4_SHARE_DENY_BOTH)
 876                 return nfserr_bad_xdr;
 877         return nfs_ok;
 878 xdr_error:
 879         return nfserr_bad_xdr;
 880 }
 881
 882 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 883 {
 884         __be32 *p;
 885
 886         READ_BUF(4);
 887         o->len = be32_to_cpup(p++);
 888
 889         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 890                 return nfserr_bad_xdr;
 891
 892         READ_BUF(o->len);
 893         SAVEMEM(o->data, o->len);
 894         return nfs_ok;
 895 xdr_error:
 896         return nfserr_bad_xdr;
 897 }
 898
 899 static __be32
 900 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 901 {
 902         DECODE_HEAD;
 903         u32 dummy;
 904
 905         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 906         open->op_iattr.ia_valid = 0;
 907         open->op_openowner = NULL;
 908
 909         open->op_xdr_error = 0;
 910         /* seqid, share_access, share_deny, clientid, ownerlen */
 911         READ_BUF(4);
 912         open->op_seqid = be32_to_cpup(p++);
 913         /* decode, yet ignore deleg_when until supported */
 914         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 915                                            &open->op_deleg_want, &dummy);
 916         if (status)
 917                 goto xdr_error;
 918         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 919         if (status)
 920                 goto xdr_error;
 921         READ_BUF(sizeof(clientid_t));
 922         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 923         status = nfsd4_decode_opaque(argp, &open->op_owner);
 924         if (status)
 925                 goto xdr_error;
 926         READ_BUF(4);
 927         open->op_create = be32_to_cpup(p++);
 928         switch (open->op_create) {
 929         case NFS4_OPEN_NOCREATE:
 930                 break;
 931         case NFS4_OPEN_CREATE:
 932                 READ_BUF(4);
 933                 open->op_createmode = be32_to_cpup(p++);
 934                 switch (open->op_createmode) {
 935                 case NFS4_CREATE_UNCHECKED:
 936                 case NFS4_CREATE_GUARDED:
 937                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 938                                 &open->op_iattr, &open->op_acl, &open->op_label,
 939                                 &open->op_umask);
 940                         if (status)
 941                                 goto out;
 942                         break;
 943                 case NFS4_CREATE_EXCLUSIVE:
 944                         READ_BUF(NFS4_VERIFIER_SIZE);
 945                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 946                         break;
 947                 case NFS4_CREATE_EXCLUSIVE4_1:
 948                         if (argp->minorversion < 1)
 949                                 goto xdr_error;
 950                         READ_BUF(NFS4_VERIFIER_SIZE);
 951                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 952                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 953                                 &open->op_iattr, &open->op_acl, &open->op_label,
 954                                 &open->op_umask);
 955                         if (status)
 956                                 goto out;
 957                         break;
 958                 default:
 959                         goto xdr_error;
 960                 }
 961                 break;
 962         default:
 963                 goto xdr_error;
 964         }
 965
 966         /* open_claim */
 967         READ_BUF(4);
 968         open->op_claim_type = be32_to_cpup(p++);
 969         switch (open->op_claim_type) {
 970         case NFS4_OPEN_CLAIM_NULL:
 971         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 972                 READ_BUF(4);
 973                 open->op_fname.len = be32_to_cpup(p++);
 974                 READ_BUF(open->op_fname.len);
 975                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 976                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 977                         return status;
 978                 break;
 979         case NFS4_OPEN_CLAIM_PREVIOUS:
 980                 READ_BUF(4);
 981                 open->op_delegate_type = be32_to_cpup(p++);
 982                 break;
 983         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 984                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 985                 if (status)
 986                         return status;
 987                 READ_BUF(4);
 988                 open->op_fname.len = be32_to_cpup(p++);
 989                 READ_BUF(open->op_fname.len);
 990                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 991                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 992                         return status;
 993                 break;
 994         case NFS4_OPEN_CLAIM_FH:
 995         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 996                 if (argp->minorversion < 1)
 997                         goto xdr_error;
 998                 /* void */
 999                 break;
1000         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1001                 if (argp->minorversion < 1)
1002                         goto xdr_error;
1003                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1004                 if (status)
1005                         return status;
1006                 break;
1007         default:
1008                 goto xdr_error;
1009         }
1010
1011         DECODE_TAIL;
1012 }
1013
1014 static __be32
1015 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1016 {
1017         DECODE_HEAD;
1018
1019         if (argp->minorversion >= 1)
1020                 return nfserr_notsupp;
1021
1022         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1023         if (status)
1024                 return status;
1025         READ_BUF(4);
1026         open_conf->oc_seqid = be32_to_cpup(p++);
1027
1028         DECODE_TAIL;
1029 }
1030
1031 static __be32
1032 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1033 {
1034         DECODE_HEAD;
1035
1036         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1037         if (status)
1038                 return status;
1039         READ_BUF(4);
1040         open_down->od_seqid = be32_to_cpup(p++);
1041         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1042                                            &open_down->od_deleg_want, NULL);
1043         if (status)
1044                 return status;
1045         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1046         if (status)
1047                 return status;
1048         DECODE_TAIL;
1049 }
1050
1051 static __be32
1052 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1053 {
1054         DECODE_HEAD;
1055
1056         READ_BUF(4);
1057         putfh->pf_fhlen = be32_to_cpup(p++);
1058         if (putfh->pf_fhlen > NFS4_FHSIZE)
1059                 goto xdr_error;
1060         READ_BUF(putfh->pf_fhlen);
1061         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1062
1063         DECODE_TAIL;
1064 }
1065
1066 static __be32
1067 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1068 {
1069         if (argp->minorversion == 0)
1070                 return nfs_ok;
1071         return nfserr_notsupp;
1072 }
1073
1074 static __be32
1075 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1076 {
1077         DECODE_HEAD;
1078
1079         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1080         if (status)
1081                 return status;
1082         READ_BUF(12);
1083         p = xdr_decode_hyper(p, &read->rd_offset);
1084         read->rd_length = be32_to_cpup(p++);
1085
1086         DECODE_TAIL;
1087 }
1088
1089 static __be32
1090 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1091 {
1092         DECODE_HEAD;
1093
1094         READ_BUF(24);
1095         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1096         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1097         readdir->rd_dircount = be32_to_cpup(p++);
1098         readdir->rd_maxcount = be32_to_cpup(p++);
1099         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1100                 goto out;
1101
1102         DECODE_TAIL;
1103 }
1104
1105 static __be32
1106 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1107 {
1108         DECODE_HEAD;
1109
1110         READ_BUF(4);
1111         remove->rm_namelen = be32_to_cpup(p++);
1112         READ_BUF(remove->rm_namelen);
1113         SAVEMEM(remove->rm_name, remove->rm_namelen);
1114         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1115                 return status;
1116
1117         DECODE_TAIL;
1118 }
1119
1120 static __be32
1121 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1122 {
1123         DECODE_HEAD;
1124
1125         READ_BUF(4);
1126         rename->rn_snamelen = be32_to_cpup(p++);
1127         READ_BUF(rename->rn_snamelen);
1128         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1129         READ_BUF(4);
1130         rename->rn_tnamelen = be32_to_cpup(p++);
1131         READ_BUF(rename->rn_tnamelen);
1132         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1133         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1134                 return status;
1135         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1136                 return status;
1137
1138         DECODE_TAIL;
1139 }
1140
1141 static __be32
1142 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1143 {
1144         DECODE_HEAD;
1145
1146         if (argp->minorversion >= 1)
1147                 return nfserr_notsupp;
1148
1149         READ_BUF(sizeof(clientid_t));
1150         COPYMEM(clientid, sizeof(clientid_t));
1151
1152         DECODE_TAIL;
1153 }
1154
1155 static __be32
1156 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1157                      struct nfsd4_secinfo *secinfo)
1158 {
1159         DECODE_HEAD;
1160
1161         READ_BUF(4);
1162         secinfo->si_namelen = be32_to_cpup(p++);
1163         READ_BUF(secinfo->si_namelen);
1164         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1165         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1166         if (status)
1167                 return status;
1168         DECODE_TAIL;
1169 }
1170
1171 static __be32
1172 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1173                      struct nfsd4_secinfo_no_name *sin)
1174 {
1175         DECODE_HEAD;
1176
1177         READ_BUF(4);
1178         sin->sin_style = be32_to_cpup(p++);
1179         DECODE_TAIL;
1180 }
1181
1182 static __be32
1183 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1184 {
1185         __be32 status;
1186
1187         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1188         if (status)
1189                 return status;
1190         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1191                                   &setattr->sa_acl, &setattr->sa_label, NULL);
1192 }
1193
1194 static __be32
1195 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1196 {
1197         DECODE_HEAD;
1198
1199         if (argp->minorversion >= 1)
1200                 return nfserr_notsupp;
1201
1202         READ_BUF(NFS4_VERIFIER_SIZE);
1203         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1204
1205         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1206         if (status)
1207                 return nfserr_bad_xdr;
1208         READ_BUF(8);
1209         setclientid->se_callback_prog = be32_to_cpup(p++);
1210         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1211         READ_BUF(setclientid->se_callback_netid_len);
1212         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1213         READ_BUF(4);
1214         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1215
1216         READ_BUF(setclientid->se_callback_addr_len);
1217         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1218         READ_BUF(4);
1219         setclientid->se_callback_ident = be32_to_cpup(p++);
1220
1221         DECODE_TAIL;
1222 }
1223
1224 static __be32
1225 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1226 {
1227         DECODE_HEAD;
1228
1229         if (argp->minorversion >= 1)
1230                 return nfserr_notsupp;
1231
1232         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1233         COPYMEM(&scd_c->sc_clientid, 8);
1234         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1235
1236         DECODE_TAIL;
1237 }
1238
1239 /* Also used for NVERIFY */
1240 static __be32
1241 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1242 {
1243         DECODE_HEAD;
1244
1245         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1246                 goto out;
1247
1248         /* For convenience's sake, we compare raw xdr'd attributes in
1249          * nfsd4_proc_verify */
1250
1251         READ_BUF(4);
1252         verify->ve_attrlen = be32_to_cpup(p++);
1253         READ_BUF(verify->ve_attrlen);
1254         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1255
1256         DECODE_TAIL;
1257 }
1258
1259 static __be32
1260 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1261 {
1262         int avail;
1263         int len;
1264         DECODE_HEAD;
1265
1266         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1267         if (status)
1268                 return status;
1269         READ_BUF(16);
1270         p = xdr_decode_hyper(p, &write->wr_offset);
1271         write->wr_stable_how = be32_to_cpup(p++);
1272         if (write->wr_stable_how > NFS_FILE_SYNC)
1273                 goto xdr_error;
1274         write->wr_buflen = be32_to_cpup(p++);
1275
1276         /* Sorry .. no magic macros for this.. *
1277          * READ_BUF(write->wr_buflen);
1278          * SAVEMEM(write->wr_buf, write->wr_buflen);
1279          */
1280         avail = (char*)argp->end - (char*)argp->p;
1281         if (avail + argp->pagelen < write->wr_buflen) {
1282                 dprintk("NFSD: xdr error (%s:%d)\n",
1283                                 __FILE__, __LINE__);
1284                 goto xdr_error;
1285         }
1286         write->wr_head.iov_base = p;
1287         write->wr_head.iov_len = avail;
1288         write->wr_pagelist = argp->pagelist;
1289
1290         len = XDR_QUADLEN(write->wr_buflen) << 2;
1291         if (len >= avail) {
1292                 int pages;
1293
1294                 len -= avail;
1295
1296                 pages = len >> PAGE_SHIFT;
1297                 argp->pagelist += pages;
1298                 argp->pagelen -= pages * PAGE_SIZE;
1299                 len -= pages * PAGE_SIZE;
1300
1301                 next_decode_page(argp);
1302         }
1303         argp->p += XDR_QUADLEN(len);
1304
1305         DECODE_TAIL;
1306 }
1307
1308 static __be32
1309 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1310 {
1311         DECODE_HEAD;
1312
1313         if (argp->minorversion >= 1)
1314                 return nfserr_notsupp;
1315
1316         READ_BUF(12);
1317         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1318         rlockowner->rl_owner.len = be32_to_cpup(p++);
1319         READ_BUF(rlockowner->rl_owner.len);
1320         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1321
1322         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1323                 return nfserr_inval;
1324         DECODE_TAIL;
1325 }
1326
1327 static __be32
1328 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1329                          struct nfsd4_exchange_id *exid)
1330 {
1331         int dummy, tmp;
1332         DECODE_HEAD;
1333
1334         READ_BUF(NFS4_VERIFIER_SIZE);
1335         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1336
1337         status = nfsd4_decode_opaque(argp, &exid->clname);
1338         if (status)
1339                 return nfserr_bad_xdr;
1340
1341         READ_BUF(4);
1342         exid->flags = be32_to_cpup(p++);
1343
1344         /* Ignore state_protect4_a */
1345         READ_BUF(4);
1346         exid->spa_how = be32_to_cpup(p++);
1347         switch (exid->spa_how) {
1348         case SP4_NONE:
1349                 break;
1350         case SP4_MACH_CRED:
1351                 /* spo_must_enforce */
1352                 status = nfsd4_decode_bitmap(argp,
1353                                         exid->spo_must_enforce);
1354                 if (status)
1355                         goto out;
1356                 /* spo_must_allow */
1357                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1358                 if (status)
1359                         goto out;
1360                 break;
1361         case SP4_SSV:
1362                 /* ssp_ops */
1363                 READ_BUF(4);
1364                 dummy = be32_to_cpup(p++);
1365                 READ_BUF(dummy * 4);
1366                 p += dummy;
1367
1368                 READ_BUF(4);
1369                 dummy = be32_to_cpup(p++);
1370                 READ_BUF(dummy * 4);
1371                 p += dummy;
1372
1373                 /* ssp_hash_algs<> */
1374                 READ_BUF(4);
1375                 tmp = be32_to_cpup(p++);
1376                 while (tmp--) {
1377                         READ_BUF(4);
1378                         dummy = be32_to_cpup(p++);
1379                         READ_BUF(dummy);
1380                         p += XDR_QUADLEN(dummy);
1381                 }
1382
1383                 /* ssp_encr_algs<> */
1384                 READ_BUF(4);
1385                 tmp = be32_to_cpup(p++);
1386                 while (tmp--) {
1387                         READ_BUF(4);
1388                         dummy = be32_to_cpup(p++);
1389                         READ_BUF(dummy);
1390                         p += XDR_QUADLEN(dummy);
1391                 }
1392
1393                 /* ssp_window and ssp_num_gss_handles */
1394                 READ_BUF(8);
1395                 dummy = be32_to_cpup(p++);
1396                 dummy = be32_to_cpup(p++);
1397                 break;
1398         default:
1399                 goto xdr_error;
1400         }
1401
1402         /* Ignore Implementation ID */
1403         READ_BUF(4);    /* nfs_impl_id4 array length */
1404         dummy = be32_to_cpup(p++);
1405
1406         if (dummy > 1)
1407                 goto xdr_error;
1408
1409         if (dummy == 1) {
1410                 /* nii_domain */
1411                 READ_BUF(4);
1412                 dummy = be32_to_cpup(p++);
1413                 READ_BUF(dummy);
1414                 p += XDR_QUADLEN(dummy);
1415
1416                 /* nii_name */
1417                 READ_BUF(4);
1418                 dummy = be32_to_cpup(p++);
1419                 READ_BUF(dummy);
1420                 p += XDR_QUADLEN(dummy);
1421
1422                 /* nii_date */
1423                 READ_BUF(12);
1424                 p += 3;
1425         }
1426         DECODE_TAIL;
1427 }
1428
1429 static __be32
1430 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1431                             struct nfsd4_create_session *sess)
1432 {
1433         DECODE_HEAD;
1434         u32 dummy;
1435
1436         READ_BUF(16);
1437         COPYMEM(&sess->clientid, 8);
1438         sess->seqid = be32_to_cpup(p++);
1439         sess->flags = be32_to_cpup(p++);
1440
1441         /* Fore channel attrs */
1442         READ_BUF(28);
1443         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1444         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1445         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1446         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1447         sess->fore_channel.maxops = be32_to_cpup(p++);
1448         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1449         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1450         if (sess->fore_channel.nr_rdma_attrs == 1) {
1451                 READ_BUF(4);
1452                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1453         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1454                 dprintk("Too many fore channel attr bitmaps!\n");
1455                 goto xdr_error;
1456         }
1457
1458         /* Back channel attrs */
1459         READ_BUF(28);
1460         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1461         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1462         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1463         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1464         sess->back_channel.maxops = be32_to_cpup(p++);
1465         sess->back_channel.maxreqs = be32_to_cpup(p++);
1466         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1467         if (sess->back_channel.nr_rdma_attrs == 1) {
1468                 READ_BUF(4);
1469                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1470         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1471                 dprintk("Too many back channel attr bitmaps!\n");
1472                 goto xdr_error;
1473         }
1474
1475         READ_BUF(4);
1476         sess->callback_prog = be32_to_cpup(p++);
1477         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1478         DECODE_TAIL;
1479 }
1480
1481 static __be32
1482 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1483                              struct nfsd4_destroy_session *destroy_session)
1484 {
1485         DECODE_HEAD;
1486         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1487         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1488
1489         DECODE_TAIL;
1490 }
1491
1492 static __be32
1493 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1494                           struct nfsd4_free_stateid *free_stateid)
1495 {
1496         DECODE_HEAD;
1497
1498         READ_BUF(sizeof(stateid_t));
1499         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1500         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1501
1502         DECODE_TAIL;
1503 }
1504
1505 static __be32
1506 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1507                       struct nfsd4_sequence *seq)
1508 {
1509         DECODE_HEAD;
1510
1511         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1512         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1513         seq->seqid = be32_to_cpup(p++);
1514         seq->slotid = be32_to_cpup(p++);
1515         seq->maxslots = be32_to_cpup(p++);
1516         seq->cachethis = be32_to_cpup(p++);
1517
1518         DECODE_TAIL;
1519 }
1520
1521 static __be32
1522 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1523 {
1524         int i;
1525         __be32 *p, status;
1526         struct nfsd4_test_stateid_id *stateid;
1527
1528         READ_BUF(4);
1529         test_stateid->ts_num_ids = ntohl(*p++);
1530
1531         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1532
1533         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1534                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1535                 if (!stateid) {
1536                         status = nfserrno(-ENOMEM);
1537                         goto out;
1538                 }
1539
1540                 INIT_LIST_HEAD(&stateid->ts_id_list);
1541                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1542
1543                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1544                 if (status)
1545                         goto out;
1546         }
1547
1548         status = 0;
1549 out:
1550         return status;
1551 xdr_error:
1552         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1553         status = nfserr_bad_xdr;
1554         goto out;
1555 }
1556
1557 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1558 {
1559         DECODE_HEAD;
1560
1561         READ_BUF(8);
1562         COPYMEM(&dc->clientid, 8);
1563
1564         DECODE_TAIL;
1565 }
1566
1567 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1568 {
1569         DECODE_HEAD;
1570
1571         READ_BUF(4);
1572         rc->rca_one_fs = be32_to_cpup(p++);
1573
1574         DECODE_TAIL;
1575 }
1576
1577 #ifdef CONFIG_NFSD_PNFS
1578 static __be32
1579 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1580                 struct nfsd4_getdeviceinfo *gdev)
1581 {
1582         DECODE_HEAD;
1583         u32 num, i;
1584
1585         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1586         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1587         gdev->gd_layout_type = be32_to_cpup(p++);
1588         gdev->gd_maxcount = be32_to_cpup(p++);
1589         num = be32_to_cpup(p++);
1590         if (num) {
1591                 if (num > 1000)
1592                         goto xdr_error;
1593                 READ_BUF(4 * num);
1594                 gdev->gd_notify_types = be32_to_cpup(p++);
1595                 for (i = 1; i < num; i++) {
1596                         if (be32_to_cpup(p++)) {
1597                                 status = nfserr_inval;
1598                                 goto out;
1599                         }
1600                 }
1601         }
1602         DECODE_TAIL;
1603 }
1604
1605 static __be32
1606 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1607                 struct nfsd4_layoutget *lgp)
1608 {
1609         DECODE_HEAD;
1610
1611         READ_BUF(36);
1612         lgp->lg_signal = be32_to_cpup(p++);
1613         lgp->lg_layout_type = be32_to_cpup(p++);
1614         lgp->lg_seg.iomode = be32_to_cpup(p++);
1615         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1616         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1617         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1618
1619         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1620         if (status)
1621                 return status;
1622
1623         READ_BUF(4);
1624         lgp->lg_maxcount = be32_to_cpup(p++);
1625
1626         DECODE_TAIL;
1627 }
1628
1629 static __be32
1630 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1631                 struct nfsd4_layoutcommit *lcp)
1632 {
1633         DECODE_HEAD;
1634         u32 timechange;
1635
1636         READ_BUF(20);
1637         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1638         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1639         lcp->lc_reclaim = be32_to_cpup(p++);
1640
1641         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1642         if (status)
1643                 return status;
1644
1645         READ_BUF(4);
1646         lcp->lc_newoffset = be32_to_cpup(p++);
1647         if (lcp->lc_newoffset) {
1648                 READ_BUF(8);
1649                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1650         } else
1651                 lcp->lc_last_wr = 0;
1652         READ_BUF(4);
1653         timechange = be32_to_cpup(p++);
1654         if (timechange) {
1655                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1656                 if (status)
1657                         return status;
1658         } else {
1659                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1660         }
1661         READ_BUF(8);
1662         lcp->lc_layout_type = be32_to_cpup(p++);
1663
1664         /*
1665          * Save the layout update in XDR format and let the layout driver deal
1666          * with it later.
1667          */
1668         lcp->lc_up_len = be32_to_cpup(p++);
1669         if (lcp->lc_up_len > 0) {
1670                 READ_BUF(lcp->lc_up_len);
1671                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1672         }
1673
1674         DECODE_TAIL;
1675 }
1676
1677 static __be32
1678 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1679                 struct nfsd4_layoutreturn *lrp)
1680 {
1681         DECODE_HEAD;
1682
1683         READ_BUF(16);
1684         lrp->lr_reclaim = be32_to_cpup(p++);
1685         lrp->lr_layout_type = be32_to_cpup(p++);
1686         lrp->lr_seg.iomode = be32_to_cpup(p++);
1687         lrp->lr_return_type = be32_to_cpup(p++);
1688         if (lrp->lr_return_type == RETURN_FILE) {
1689                 READ_BUF(16);
1690                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1691                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1692
1693                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1694                 if (status)
1695                         return status;
1696
1697                 READ_BUF(4);
1698                 lrp->lrf_body_len = be32_to_cpup(p++);
1699                 if (lrp->lrf_body_len > 0) {
1700                         READ_BUF(lrp->lrf_body_len);
1701                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1702                 }
1703         } else {
1704                 lrp->lr_seg.offset = 0;
1705                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1706         }
1707
1708         DECODE_TAIL;
1709 }
1710 #endif /* CONFIG_NFSD_PNFS */
1711
1712 static __be32
1713 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1714                        struct nfsd4_fallocate *fallocate)
1715 {
1716         DECODE_HEAD;
1717
1718         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1719         if (status)
1720                 return status;
1721
1722         READ_BUF(16);
1723         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1724         xdr_decode_hyper(p, &fallocate->falloc_length);
1725
1726         DECODE_TAIL;
1727 }
1728
1729 static __be32
1730 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1731 {
1732         DECODE_HEAD;
1733
1734         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1735         if (status)
1736                 return status;
1737         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1738         if (status)
1739                 return status;
1740
1741         READ_BUF(8 + 8 + 8);
1742         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1743         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1744         p = xdr_decode_hyper(p, &clone->cl_count);
1745         DECODE_TAIL;
1746 }
1747
1748 static __be32
1749 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1750 {
1751         DECODE_HEAD;
1752         unsigned int tmp;
1753
1754         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1755         if (status)
1756                 return status;
1757         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1758         if (status)
1759                 return status;
1760
1761         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1762         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1763         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1764         p = xdr_decode_hyper(p, &copy->cp_count);
1765         p++; /* ca_consecutive: we always do consecutive copies */
1766         copy->cp_synchronous = be32_to_cpup(p++);
1767         tmp = be32_to_cpup(p); /* Source server list not supported */
1768
1769         DECODE_TAIL;
1770 }
1771
1772 static __be32
1773 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1774 {
1775         DECODE_HEAD;
1776
1777         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1778         if (status)
1779                 return status;
1780
1781         READ_BUF(8 + 4);
1782         p = xdr_decode_hyper(p, &seek->seek_offset);
1783         seek->seek_whence = be32_to_cpup(p);
1784
1785         DECODE_TAIL;
1786 }
1787
1788 static __be32
1789 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1790 {
1791         return nfs_ok;
1792 }
1793
1794 static __be32
1795 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1796 {
1797         return nfserr_notsupp;
1798 }
1799
1800 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1801
1802 static const nfsd4_dec nfsd4_dec_ops[] = {
1803         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1804         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1805         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1806         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1807         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1808         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1809         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1810         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1811         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1812         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1813         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1814         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1815         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1816         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1817         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1818         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1819         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1820         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1821         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1822         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1823         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1824         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1825         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1826         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1827         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1828         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1829         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1830         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1831         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1832         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1833         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1834         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1835         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1836         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1837         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1838         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1839         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1840
1841         /* new operations for NFSv4.1 */
1842         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1843         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1844         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1845         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1846         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1847         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1848         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1849 #ifdef CONFIG_NFSD_PNFS
1850         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1851         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1852         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1853         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1854         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1855 #else
1856         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1857         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1858         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1859         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1860         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1861 #endif
1862         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1863         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1864         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1865         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1866         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1867         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1868         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1869
1870         /* new operations for NFSv4.2 */
1871         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1872         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1873         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1874         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1875         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1876         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1877         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1878         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1879         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1880         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1881         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1882         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1883         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1884 };
1885
1886 static inline bool
1887 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1888 {
1889         if (op->opnum < FIRST_NFS4_OP)
1890                 return false;
1891         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1892                 return false;
1893         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1894                 return false;
1895         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1896                 return false;
1897         return true;
1898 }
1899
1900 static __be32
1901 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1902 {
1903         DECODE_HEAD;
1904         struct nfsd4_op *op;
1905         bool cachethis = false;
1906         int auth_slack= argp->rqstp->rq_auth_slack;
1907         int max_reply = auth_slack + 8; /* opcnt, status */
1908         int readcount = 0;
1909         int readbytes = 0;
1910         int i;
1911
1912         READ_BUF(4);
1913         argp->taglen = be32_to_cpup(p++);
1914         READ_BUF(argp->taglen);
1915         SAVEMEM(argp->tag, argp->taglen);
1916         READ_BUF(8);
1917         argp->minorversion = be32_to_cpup(p++);
1918         argp->opcnt = be32_to_cpup(p++);
1919         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1920
1921         if (argp->taglen > NFSD4_MAX_TAGLEN)
1922                 goto xdr_error;
1923         /*
1924          * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
1925          * here, so we return success at the xdr level so that
1926          * nfsd4_proc can handle this is an NFS-level error.
1927          */
1928         if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1929                 return 0;
1930
1931         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1932                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1933                 if (!argp->ops) {
1934                         argp->ops = argp->iops;
1935                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1936                         goto xdr_error;
1937                 }
1938         }
1939
1940         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1941                 argp->opcnt = 0;
1942
1943         for (i = 0; i < argp->opcnt; i++) {
1944                 op = &argp->ops[i];
1945                 op->replay = NULL;
1946
1947                 READ_BUF(4);
1948                 op->opnum = be32_to_cpup(p++);
1949
1950                 if (nfsd4_opnum_in_range(argp, op))
1951                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1952                 else {
1953                         op->opnum = OP_ILLEGAL;
1954                         op->status = nfserr_op_illegal;
1955                 }
1956                 op->opdesc = OPDESC(op);
1957                 /*
1958                  * We'll try to cache the result in the DRC if any one
1959                  * op in the compound wants to be cached:
1960                  */
1961                 cachethis |= nfsd4_cache_this_op(op);
1962
1963                 if (op->opnum == OP_READ) {
1964                         readcount++;
1965                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1966                 } else
1967                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1968                 /*
1969                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
1970                  * (Special case because it will just skip encoding this
1971                  * if it runs out of xdr buffer space, and it is the only
1972                  * operation that behaves this way.)
1973                  */
1974                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1975                         max_reply += NFS4_OPAQUE_LIMIT;
1976
1977                 if (op->status) {
1978                         argp->opcnt = i+1;
1979                         break;
1980                 }
1981         }
1982         /* Sessions make the DRC unnecessary: */
1983         if (argp->minorversion)
1984                 cachethis = false;
1985         svc_reserve(argp->rqstp, max_reply + readbytes);
1986         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1987
1988         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1989                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1990
1991         DECODE_TAIL;
1992 }
1993
1994 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
1995                              struct svc_export *exp)
1996 {
1997         if (exp->ex_flags & NFSEXP_V4ROOT) {
1998                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
1999                 *p++ = 0;
2000         } else if (IS_I_VERSION(inode)) {
2001                 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2002         } else {
2003                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2004                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2005         }
2006         return p;
2007 }
2008
2009 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2010 {
2011         *p++ = cpu_to_be32(c->atomic);
2012         if (c->change_supported) {
2013                 p = xdr_encode_hyper(p, c->before_change);
2014                 p = xdr_encode_hyper(p, c->after_change);
2015         } else {
2016                 *p++ = cpu_to_be32(c->before_ctime_sec);
2017                 *p++ = cpu_to_be32(c->before_ctime_nsec);
2018                 *p++ = cpu_to_be32(c->after_ctime_sec);
2019                 *p++ = cpu_to_be32(c->after_ctime_nsec);
2020         }
2021         return p;
2022 }
2023
2024 /* Encode as an array of strings the string given with components
2025  * separated @sep, escaped with esc_enter and esc_exit.
2026  */
2027 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2028                                           char *components, char esc_enter,
2029                                           char esc_exit)
2030 {
2031         __be32 *p;
2032         __be32 pathlen;
2033         int pathlen_offset;
2034         int strlen, count=0;
2035         char *str, *end, *next;
2036
2037         dprintk("nfsd4_encode_components(%s)\n", components);
2038
2039         pathlen_offset = xdr->buf->len;
2040         p = xdr_reserve_space(xdr, 4);
2041         if (!p)
2042                 return nfserr_resource;
2043         p++; /* We will fill this in with @count later */
2044
2045         end = str = components;
2046         while (*end) {
2047                 bool found_esc = false;
2048
2049                 /* try to parse as esc_start, ..., esc_end, sep */
2050                 if (*str == esc_enter) {
2051                         for (; *end && (*end != esc_exit); end++)
2052                                 /* find esc_exit or end of string */;
2053                         next = end + 1;
2054                         if (*end && (!*next || *next == sep)) {
2055                                 str++;
2056                                 found_esc = true;
2057                         }
2058                 }
2059
2060                 if (!found_esc)
2061                         for (; *end && (*end != sep); end++)
2062                                 /* find sep or end of string */;
2063
2064                 strlen = end - str;
2065                 if (strlen) {
2066                         p = xdr_reserve_space(xdr, strlen + 4);
2067                         if (!p)
2068                                 return nfserr_resource;
2069                         p = xdr_encode_opaque(p, str, strlen);
2070                         count++;
2071                 }
2072                 else
2073                         end++;
2074                 if (found_esc)
2075                         end = next;
2076
2077                 str = end;
2078         }
2079         pathlen = htonl(count);
2080         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2081         return 0;
2082 }
2083
2084 /* Encode as an array of strings the string given with components
2085  * separated @sep.
2086  */
2087 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2088                                       char *components)
2089 {
2090         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2091 }
2092
2093 /*
2094  * encode a location element of a fs_locations structure
2095  */
2096 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2097                                         struct nfsd4_fs_location *location)
2098 {
2099         __be32 status;
2100
2101         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2102                                                 '[', ']');
2103         if (status)
2104                 return status;
2105         status = nfsd4_encode_components(xdr, '/', location->path);
2106         if (status)
2107                 return status;
2108         return 0;
2109 }
2110
2111 /*
2112  * Encode a path in RFC3530 'pathname4' format
2113  */
2114 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2115                                 const struct path *root,
2116                                 const struct path *path)
2117 {
2118         struct path cur = *path;
2119         __be32 *p;
2120         struct dentry **components = NULL;
2121         unsigned int ncomponents = 0;
2122         __be32 err = nfserr_jukebox;
2123
2124         dprintk("nfsd4_encode_components(");
2125
2126         path_get(&cur);
2127         /* First walk the path up to the nfsd root, and store the
2128          * dentries/path components in an array.
2129          */
2130         for (;;) {
2131                 if (path_equal(&cur, root))
2132                         break;
2133                 if (cur.dentry == cur.mnt->mnt_root) {
2134                         if (follow_up(&cur))
2135                                 continue;
2136                         goto out_free;
2137                 }
2138                 if ((ncomponents & 15) == 0) {
2139                         struct dentry **new;
2140                         new = krealloc(components,
2141                                         sizeof(*new) * (ncomponents + 16),
2142                                         GFP_KERNEL);
2143                         if (!new)
2144                                 goto out_free;
2145                         components = new;
2146                 }
2147                 components[ncomponents++] = cur.dentry;
2148                 cur.dentry = dget_parent(cur.dentry);
2149         }
2150         err = nfserr_resource;
2151         p = xdr_reserve_space(xdr, 4);
2152         if (!p)
2153                 goto out_free;
2154         *p++ = cpu_to_be32(ncomponents);
2155
2156         while (ncomponents) {
2157                 struct dentry *dentry = components[ncomponents - 1];
2158                 unsigned int len;
2159
2160                 spin_lock(&dentry->d_lock);
2161                 len = dentry->d_name.len;
2162                 p = xdr_reserve_space(xdr, len + 4);
2163                 if (!p) {
2164                         spin_unlock(&dentry->d_lock);
2165                         goto out_free;
2166                 }
2167                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2168                 dprintk("/%pd", dentry);
2169                 spin_unlock(&dentry->d_lock);
2170                 dput(dentry);
2171                 ncomponents--;
2172         }
2173
2174         err = 0;
2175 out_free:
2176         dprintk(")\n");
2177         while (ncomponents)
2178                 dput(components[--ncomponents]);
2179         kfree(components);
2180         path_put(&cur);
2181         return err;
2182 }
2183
2184 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2185                         struct svc_rqst *rqstp, const struct path *path)
2186 {
2187         struct svc_export *exp_ps;
2188         __be32 res;
2189
2190         exp_ps = rqst_find_fsidzero_export(rqstp);
2191         if (IS_ERR(exp_ps))
2192                 return nfserrno(PTR_ERR(exp_ps));
2193         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2194         exp_put(exp_ps);
2195         return res;
2196 }
2197
2198 /*
2199  *  encode a fs_locations structure
2200  */
2201 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2202                         struct svc_rqst *rqstp, struct svc_export *exp)
2203 {
2204         __be32 status;
2205         int i;
2206         __be32 *p;
2207         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2208
2209         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2210         if (status)
2211                 return status;
2212         p = xdr_reserve_space(xdr, 4);
2213         if (!p)
2214                 return nfserr_resource;
2215         *p++ = cpu_to_be32(fslocs->locations_count);
2216         for (i=0; i<fslocs->locations_count; i++) {
2217                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2218                 if (status)
2219                         return status;
2220         }
2221         return 0;
2222 }
2223
2224 static u32 nfs4_file_type(umode_t mode)
2225 {
2226         switch (mode & S_IFMT) {
2227         case S_IFIFO:   return NF4FIFO;
2228         case S_IFCHR:   return NF4CHR;
2229         case S_IFDIR:   return NF4DIR;
2230         case S_IFBLK:   return NF4BLK;
2231         case S_IFLNK:   return NF4LNK;
2232         case S_IFREG:   return NF4REG;
2233         case S_IFSOCK:  return NF4SOCK;
2234         default:        return NF4BAD;
2235         };
2236 }
2237
2238 static inline __be32
2239 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2240                      struct nfs4_ace *ace)
2241 {
2242         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2243                 return nfs4_acl_write_who(xdr, ace->whotype);
2244         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2245                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2246         else
2247                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2248 }
2249
2250 static inline __be32
2251 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2252 {
2253         __be32          *p;
2254         unsigned long   i = hweight_long(layout_types);
2255
2256         p = xdr_reserve_space(xdr, 4 + 4 * i);
2257         if (!p)
2258                 return nfserr_resource;
2259
2260         *p++ = cpu_to_be32(i);
2261
2262         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2263                 if (layout_types & (1 << i))
2264                         *p++ = cpu_to_be32(i);
2265
2266         return 0;
2267 }
2268
2269 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2270                               FATTR4_WORD0_RDATTR_ERROR)
2271 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2272 #define WORD2_ABSENT_FS_ATTRS 0
2273
2274 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2275 static inline __be32
2276 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2277                             void *context, int len)
2278 {
2279         __be32 *p;
2280
2281         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2282         if (!p)
2283                 return nfserr_resource;
2284
2285         /*
2286          * For now we use a 0 here to indicate the null translation; in
2287          * the future we may place a call to translation code here.
2288          */
2289         *p++ = cpu_to_be32(0); /* lfs */
2290         *p++ = cpu_to_be32(0); /* pi */
2291         p = xdr_encode_opaque(p, context, len);
2292         return 0;
2293 }
2294 #else
2295 static inline __be32
2296 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2297                             void *context, int len)
2298 { return 0; }
2299 #endif
2300
2301 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2302 {
2303         /* As per referral draft:  */
2304         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2305             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2306                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2307                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2308                         *rdattr_err = NFSERR_MOVED;
2309                 else
2310                         return nfserr_moved;
2311         }
2312         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2313         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2314         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2315         return 0;
2316 }
2317
2318
2319 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2320 {
2321         struct path path = exp->ex_path;
2322         int err;
2323
2324         path_get(&path);
2325         while (follow_up(&path)) {
2326                 if (path.dentry != path.mnt->mnt_root)
2327                         break;
2328         }
2329         err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2330         path_put(&path);
2331         return err;
2332 }
2333
2334 static __be32
2335 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2336 {
2337         __be32 *p;
2338
2339         if (bmval2) {
2340                 p = xdr_reserve_space(xdr, 16);
2341                 if (!p)
2342                         goto out_resource;
2343                 *p++ = cpu_to_be32(3);
2344                 *p++ = cpu_to_be32(bmval0);
2345                 *p++ = cpu_to_be32(bmval1);
2346                 *p++ = cpu_to_be32(bmval2);
2347         } else if (bmval1) {
2348                 p = xdr_reserve_space(xdr, 12);
2349                 if (!p)
2350                         goto out_resource;
2351                 *p++ = cpu_to_be32(2);
2352                 *p++ = cpu_to_be32(bmval0);
2353                 *p++ = cpu_to_be32(bmval1);
2354         } else {
2355                 p = xdr_reserve_space(xdr, 8);
2356                 if (!p)
2357                         goto out_resource;
2358                 *p++ = cpu_to_be32(1);
2359                 *p++ = cpu_to_be32(bmval0);
2360         }
2361
2362         return 0;
2363 out_resource:
2364         return nfserr_resource;
2365 }
2366
2367 /*
2368  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2369  * ourselves.
2370  */
2371 static __be32
2372 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2373                 struct svc_export *exp,
2374                 struct dentry *dentry, u32 *bmval,
2375                 struct svc_rqst *rqstp, int ignore_crossmnt)
2376 {
2377         u32 bmval0 = bmval[0];
2378         u32 bmval1 = bmval[1];
2379         u32 bmval2 = bmval[2];
2380         struct kstat stat;
2381         struct svc_fh *tempfh = NULL;
2382         struct kstatfs statfs;
2383         __be32 *p;
2384         int starting_len = xdr->buf->len;
2385         int attrlen_offset;
2386         __be32 attrlen;
2387         u32 dummy;
2388         u64 dummy64;
2389         u32 rdattr_err = 0;
2390         __be32 status;
2391         int err;
2392         struct nfs4_acl *acl = NULL;
2393         void *context = NULL;
2394         int contextlen;
2395         bool contextsupport = false;
2396         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2397         u32 minorversion = resp->cstate.minorversion;
2398         struct path path = {
2399                 .mnt    = exp->ex_path.mnt,
2400                 .dentry = dentry,
2401         };
2402         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2403
2404         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2405         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2406
2407         if (exp->ex_fslocs.migrated) {
2408                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2409                 if (status)
2410                         goto out;
2411         }
2412
2413         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2414         if (err)
2415                 goto out_nfserr;
2416         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2417                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2418             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2419                        FATTR4_WORD1_SPACE_TOTAL))) {
2420                 err = vfs_statfs(&path, &statfs);
2421                 if (err)
2422                         goto out_nfserr;
2423         }
2424         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2425                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2426                 status = nfserr_jukebox;
2427                 if (!tempfh)
2428                         goto out;
2429                 fh_init(tempfh, NFS4_FHSIZE);
2430                 status = fh_compose(tempfh, exp, dentry, NULL);
2431                 if (status)
2432                         goto out;
2433                 fhp = tempfh;
2434         }
2435         if (bmval0 & FATTR4_WORD0_ACL) {
2436                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2437                 if (err == -EOPNOTSUPP)
2438                         bmval0 &= ~FATTR4_WORD0_ACL;
2439                 else if (err == -EINVAL) {
2440                         status = nfserr_attrnotsupp;
2441                         goto out;
2442                 } else if (err != 0)
2443                         goto out_nfserr;
2444         }
2445
2446 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2447         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2448              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2449                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2450                         err = security_inode_getsecctx(d_inode(dentry),
2451                                                 &context, &contextlen);
2452                 else
2453                         err = -EOPNOTSUPP;
2454                 contextsupport = (err == 0);
2455                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2456                         if (err == -EOPNOTSUPP)
2457                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2458                         else if (err)
2459                                 goto out_nfserr;
2460                 }
2461         }
2462 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2463
2464         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2465         if (status)
2466                 goto out;
2467
2468         attrlen_offset = xdr->buf->len;
2469         p = xdr_reserve_space(xdr, 4);
2470         if (!p)
2471                 goto out_resource;
2472         p++;                /* to be backfilled later */
2473
2474         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2475                 u32 supp[3];
2476
2477                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2478
2479                 if (!IS_POSIXACL(dentry->d_inode))
2480                         supp[0] &= ~FATTR4_WORD0_ACL;
2481                 if (!contextsupport)
2482                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2483                 if (!supp[2]) {
2484                         p = xdr_reserve_space(xdr, 12);
2485                         if (!p)
2486                                 goto out_resource;
2487                         *p++ = cpu_to_be32(2);
2488                         *p++ = cpu_to_be32(supp[0]);
2489                         *p++ = cpu_to_be32(supp[1]);
2490                 } else {
2491                         p = xdr_reserve_space(xdr, 16);
2492                         if (!p)
2493                                 goto out_resource;
2494                         *p++ = cpu_to_be32(3);
2495                         *p++ = cpu_to_be32(supp[0]);
2496                         *p++ = cpu_to_be32(supp[1]);
2497                         *p++ = cpu_to_be32(supp[2]);
2498                 }
2499         }
2500         if (bmval0 & FATTR4_WORD0_TYPE) {
2501                 p = xdr_reserve_space(xdr, 4);
2502                 if (!p)
2503                         goto out_resource;
2504                 dummy = nfs4_file_type(stat.mode);
2505                 if (dummy == NF4BAD) {
2506                         status = nfserr_serverfault;
2507                         goto out;
2508                 }
2509                 *p++ = cpu_to_be32(dummy);
2510         }
2511         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2512                 p = xdr_reserve_space(xdr, 4);
2513                 if (!p)
2514                         goto out_resource;
2515                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2516                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2517                 else
2518                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2519                                                 NFS4_FH_VOL_RENAME);
2520         }
2521         if (bmval0 & FATTR4_WORD0_CHANGE) {
2522                 p = xdr_reserve_space(xdr, 8);
2523                 if (!p)
2524                         goto out_resource;
2525                 p = encode_change(p, &stat, d_inode(dentry), exp);
2526         }
2527         if (bmval0 & FATTR4_WORD0_SIZE) {
2528                 p = xdr_reserve_space(xdr, 8);
2529                 if (!p)
2530                         goto out_resource;
2531                 p = xdr_encode_hyper(p, stat.size);
2532         }
2533         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2534                 p = xdr_reserve_space(xdr, 4);
2535                 if (!p)
2536                         goto out_resource;
2537                 *p++ = cpu_to_be32(1);
2538         }
2539         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2540                 p = xdr_reserve_space(xdr, 4);
2541                 if (!p)
2542                         goto out_resource;
2543                 *p++ = cpu_to_be32(1);
2544         }
2545         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2546                 p = xdr_reserve_space(xdr, 4);
2547                 if (!p)
2548                         goto out_resource;
2549                 *p++ = cpu_to_be32(0);
2550         }
2551         if (bmval0 & FATTR4_WORD0_FSID) {
2552                 p = xdr_reserve_space(xdr, 16);
2553                 if (!p)
2554                         goto out_resource;
2555                 if (exp->ex_fslocs.migrated) {
2556                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2557                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2558                 } else switch(fsid_source(fhp)) {
2559                 case FSIDSOURCE_FSID:
2560                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2561                         p = xdr_encode_hyper(p, (u64)0);
2562                         break;
2563                 case FSIDSOURCE_DEV:
2564                         *p++ = cpu_to_be32(0);
2565                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2566                         *p++ = cpu_to_be32(0);
2567                         *p++ = cpu_to_be32(MINOR(stat.dev));
2568                         break;
2569                 case FSIDSOURCE_UUID:
2570                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2571                                                                 EX_UUID_LEN);
2572                         break;
2573                 }
2574         }
2575         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2576                 p = xdr_reserve_space(xdr, 4);
2577                 if (!p)
2578                         goto out_resource;
2579                 *p++ = cpu_to_be32(0);
2580         }
2581         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2582                 p = xdr_reserve_space(xdr, 4);
2583                 if (!p)
2584                         goto out_resource;
2585                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2586         }
2587         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2588                 p = xdr_reserve_space(xdr, 4);
2589                 if (!p)
2590                         goto out_resource;
2591                 *p++ = cpu_to_be32(rdattr_err);
2592         }
2593         if (bmval0 & FATTR4_WORD0_ACL) {
2594                 struct nfs4_ace *ace;
2595
2596                 if (acl == NULL) {
2597                         p = xdr_reserve_space(xdr, 4);
2598                         if (!p)
2599                                 goto out_resource;
2600
2601                         *p++ = cpu_to_be32(0);
2602                         goto out_acl;
2603                 }
2604                 p = xdr_reserve_space(xdr, 4);
2605                 if (!p)
2606                         goto out_resource;
2607                 *p++ = cpu_to_be32(acl->naces);
2608
2609                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2610                         p = xdr_reserve_space(xdr, 4*3);
2611                         if (!p)
2612                                 goto out_resource;
2613                         *p++ = cpu_to_be32(ace->type);
2614                         *p++ = cpu_to_be32(ace->flag);
2615                         *p++ = cpu_to_be32(ace->access_mask &
2616                                                         NFS4_ACE_MASK_ALL);
2617                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2618                         if (status)
2619                                 goto out;
2620                 }
2621         }
2622 out_acl:
2623         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2624                 p = xdr_reserve_space(xdr, 4);
2625                 if (!p)
2626                         goto out_resource;
2627                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2628                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2629         }
2630         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2631                 p = xdr_reserve_space(xdr, 4);
2632                 if (!p)
2633                         goto out_resource;
2634                 *p++ = cpu_to_be32(1);
2635         }
2636         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2637                 p = xdr_reserve_space(xdr, 4);
2638                 if (!p)
2639                         goto out_resource;
2640                 *p++ = cpu_to_be32(0);
2641         }
2642         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2643                 p = xdr_reserve_space(xdr, 4);
2644                 if (!p)
2645                         goto out_resource;
2646                 *p++ = cpu_to_be32(1);
2647         }
2648         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2649                 p = xdr_reserve_space(xdr, 4);
2650                 if (!p)
2651                         goto out_resource;
2652                 *p++ = cpu_to_be32(1);
2653         }
2654         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2655                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2656                 if (!p)
2657                         goto out_resource;
2658                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2659                                         fhp->fh_handle.fh_size);
2660         }
2661         if (bmval0 & FATTR4_WORD0_FILEID) {
2662                 p = xdr_reserve_space(xdr, 8);
2663                 if (!p)
2664                         goto out_resource;
2665                 p = xdr_encode_hyper(p, stat.ino);
2666         }
2667         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2668                 p = xdr_reserve_space(xdr, 8);
2669                 if (!p)
2670                         goto out_resource;
2671                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2672         }
2673         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2674                 p = xdr_reserve_space(xdr, 8);
2675                 if (!p)
2676                         goto out_resource;
2677                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2678         }
2679         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2680                 p = xdr_reserve_space(xdr, 8);
2681                 if (!p)
2682                         goto out_resource;
2683                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2684         }
2685         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2686                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2687                 if (status)
2688                         goto out;
2689         }
2690         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2691                 p = xdr_reserve_space(xdr, 4);
2692                 if (!p)
2693                         goto out_resource;
2694                 *p++ = cpu_to_be32(1);
2695         }
2696         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2697                 p = xdr_reserve_space(xdr, 8);
2698                 if (!p)
2699                         goto out_resource;
2700                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2701         }
2702         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2703                 p = xdr_reserve_space(xdr, 4);
2704                 if (!p)
2705                         goto out_resource;
2706                 *p++ = cpu_to_be32(255);
2707         }
2708         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2709                 p = xdr_reserve_space(xdr, 4);
2710                 if (!p)
2711                         goto out_resource;
2712                 *p++ = cpu_to_be32(statfs.f_namelen);
2713         }
2714         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2715                 p = xdr_reserve_space(xdr, 8);
2716                 if (!p)
2717                         goto out_resource;
2718                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2719         }
2720         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2721                 p = xdr_reserve_space(xdr, 8);
2722                 if (!p)
2723                         goto out_resource;
2724                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2725         }
2726         if (bmval1 & FATTR4_WORD1_MODE) {
2727                 p = xdr_reserve_space(xdr, 4);
2728                 if (!p)
2729                         goto out_resource;
2730                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2731         }
2732         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2733                 p = xdr_reserve_space(xdr, 4);
2734                 if (!p)
2735                         goto out_resource;
2736                 *p++ = cpu_to_be32(1);
2737         }
2738         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2739                 p = xdr_reserve_space(xdr, 4);
2740                 if (!p)
2741                         goto out_resource;
2742                 *p++ = cpu_to_be32(stat.nlink);
2743         }
2744         if (bmval1 & FATTR4_WORD1_OWNER) {
2745                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2746                 if (status)
2747                         goto out;
2748         }
2749         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2750                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2751                 if (status)
2752                         goto out;
2753         }
2754         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2755                 p = xdr_reserve_space(xdr, 8);
2756                 if (!p)
2757                         goto out_resource;
2758                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2759                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2760         }
2761         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2762                 p = xdr_reserve_space(xdr, 8);
2763                 if (!p)
2764                         goto out_resource;
2765                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2766                 p = xdr_encode_hyper(p, dummy64);
2767         }
2768         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2769                 p = xdr_reserve_space(xdr, 8);
2770                 if (!p)
2771                         goto out_resource;
2772                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2773                 p = xdr_encode_hyper(p, dummy64);
2774         }
2775         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2776                 p = xdr_reserve_space(xdr, 8);
2777                 if (!p)
2778                         goto out_resource;
2779                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2780                 p = xdr_encode_hyper(p, dummy64);
2781         }
2782         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2783                 p = xdr_reserve_space(xdr, 8);
2784                 if (!p)
2785                         goto out_resource;
2786                 dummy64 = (u64)stat.blocks << 9;
2787                 p = xdr_encode_hyper(p, dummy64);
2788         }
2789         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2790                 p = xdr_reserve_space(xdr, 12);
2791                 if (!p)
2792                         goto out_resource;
2793                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2794                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2795         }
2796         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2797                 p = xdr_reserve_space(xdr, 12);
2798                 if (!p)
2799                         goto out_resource;
2800                 *p++ = cpu_to_be32(0);
2801                 *p++ = cpu_to_be32(1);
2802                 *p++ = cpu_to_be32(0);
2803         }
2804         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2805                 p = xdr_reserve_space(xdr, 12);
2806                 if (!p)
2807                         goto out_resource;
2808                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2809                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2810         }
2811         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2812                 p = xdr_reserve_space(xdr, 12);
2813                 if (!p)
2814                         goto out_resource;
2815                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2816                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2817         }
2818         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2819                 struct kstat parent_stat;
2820                 u64 ino = stat.ino;
2821
2822                 p = xdr_reserve_space(xdr, 8);
2823                 if (!p)
2824                         goto out_resource;
2825                 /*
2826                  * Get parent's attributes if not ignoring crossmount
2827                  * and this is the root of a cross-mounted filesystem.
2828                  */
2829                 if (ignore_crossmnt == 0 &&
2830                     dentry == exp->ex_path.mnt->mnt_root) {
2831                         err = get_parent_attributes(exp, &parent_stat);
2832                         if (err)
2833                                 goto out_nfserr;
2834                         ino = parent_stat.ino;
2835                 }
2836                 p = xdr_encode_hyper(p, ino);
2837         }
2838 #ifdef CONFIG_NFSD_PNFS
2839         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2840                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2841                 if (status)
2842                         goto out;
2843         }
2844
2845         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2846                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2847                 if (status)
2848                         goto out;
2849         }
2850
2851         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2852                 p = xdr_reserve_space(xdr, 4);
2853                 if (!p)
2854                         goto out_resource;
2855                 *p++ = cpu_to_be32(stat.blksize);
2856         }
2857 #endif /* CONFIG_NFSD_PNFS */
2858         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2859                 u32 supp[3];
2860
2861                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2862                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2863                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2864                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2865
2866                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2867                 if (status)
2868                         goto out;
2869         }
2870
2871         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2872                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2873                                                                 contextlen);
2874                 if (status)
2875                         goto out;
2876         }
2877
2878         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2879         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2880         status = nfs_ok;
2881
2882 out:
2883 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2884         if (context)
2885                 security_release_secctx(context, contextlen);
2886 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2887         kfree(acl);
2888         if (tempfh) {
2889                 fh_put(tempfh);
2890                 kfree(tempfh);
2891         }
2892         if (status)
2893                 xdr_truncate_encode(xdr, starting_len);
2894         return status;
2895 out_nfserr:
2896         status = nfserrno(err);
2897         goto out;
2898 out_resource:
2899         status = nfserr_resource;
2900         goto out;
2901 }
2902
2903 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2904                                 struct xdr_buf *buf, __be32 *p, int bytes)
2905 {
2906         xdr->scratch.iov_len = 0;
2907         memset(buf, 0, sizeof(struct xdr_buf));
2908         buf->head[0].iov_base = p;
2909         buf->head[0].iov_len = 0;
2910         buf->len = 0;
2911         xdr->buf = buf;
2912         xdr->iov = buf->head;
2913         xdr->p = p;
2914         xdr->end = (void *)p + bytes;
2915         buf->buflen = bytes;
2916 }
2917
2918 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2919                         struct svc_fh *fhp, struct svc_export *exp,
2920                         struct dentry *dentry, u32 *bmval,
2921                         struct svc_rqst *rqstp, int ignore_crossmnt)
2922 {
2923         struct xdr_buf dummy;
2924         struct xdr_stream xdr;
2925         __be32 ret;
2926
2927         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2928         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2929                                                         ignore_crossmnt);
2930         *p = xdr.p;
2931         return ret;
2932 }
2933
2934 static inline int attributes_need_mount(u32 *bmval)
2935 {
2936         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2937                 return 1;
2938         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2939                 return 1;
2940         return 0;
2941 }
2942
2943 static __be32
2944 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2945                         const char *name, int namlen)
2946 {
2947         struct svc_export *exp = cd->rd_fhp->fh_export;
2948         struct dentry *dentry;
2949         __be32 nfserr;
2950         int ignore_crossmnt = 0;
2951
2952         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2953         if (IS_ERR(dentry))
2954                 return nfserrno(PTR_ERR(dentry));
2955         if (d_really_is_negative(dentry)) {
2956                 /*
2957                  * we're not holding the i_mutex here, so there's
2958                  * a window where this directory entry could have gone
2959                  * away.
2960                  */
2961                 dput(dentry);
2962                 return nfserr_noent;
2963         }
2964
2965         exp_get(exp);
2966         /*
2967          * In the case of a mountpoint, the client may be asking for
2968          * attributes that are only properties of the underlying filesystem
2969          * as opposed to the cross-mounted file system. In such a case,
2970          * we will not follow the cross mount and will fill the attribtutes
2971          * directly from the mountpoint dentry.
2972          */
2973         if (nfsd_mountpoint(dentry, exp)) {
2974                 int err;
2975
2976                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2977                                 && !attributes_need_mount(cd->rd_bmval)) {
2978                         ignore_crossmnt = 1;
2979                         goto out_encode;
2980                 }
2981                 /*
2982                  * Why the heck aren't we just using nfsd_lookup??
2983                  * Different "."/".." handling?  Something else?
2984                  * At least, add a comment here to explain....
2985                  */
2986                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2987                 if (err) {
2988                         nfserr = nfserrno(err);
2989                         goto out_put;
2990                 }
2991                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2992                 if (nfserr)
2993                         goto out_put;
2994
2995         }
2996 out_encode:
2997         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2998                                         cd->rd_rqstp, ignore_crossmnt);
2999 out_put:
3000         dput(dentry);
3001         exp_put(exp);
3002         return nfserr;
3003 }
3004
3005 static __be32 *
3006 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3007 {
3008         __be32 *p;
3009
3010         p = xdr_reserve_space(xdr, 20);
3011         if (!p)
3012                 return NULL;
3013         *p++ = htonl(2);
3014         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3015         *p++ = htonl(0);                         /* bmval1 */
3016
3017         *p++ = htonl(4);     /* attribute length */
3018         *p++ = nfserr;       /* no htonl */
3019         return p;
3020 }
3021
3022 static int
3023 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3024                     loff_t offset, u64 ino, unsigned int d_type)
3025 {
3026         struct readdir_cd *ccd = ccdv;
3027         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3028         struct xdr_stream *xdr = cd->xdr;
3029         int start_offset = xdr->buf->len;
3030         int cookie_offset;
3031         u32 name_and_cookie;
3032         int entry_bytes;
3033         __be32 nfserr = nfserr_toosmall;
3034         __be64 wire_offset;
3035         __be32 *p;
3036
3037         /* In nfsv4, "." and ".." never make it onto the wire.. */
3038         if (name && isdotent(name, namlen)) {
3039                 cd->common.err = nfs_ok;
3040                 return 0;
3041         }
3042
3043         if (cd->cookie_offset) {
3044                 wire_offset = cpu_to_be64(offset);
3045                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3046                                                         &wire_offset, 8);
3047         }
3048
3049         p = xdr_reserve_space(xdr, 4);
3050         if (!p)
3051                 goto fail;
3052         *p++ = xdr_one;                             /* mark entry present */
3053         cookie_offset = xdr->buf->len;
3054         p = xdr_reserve_space(xdr, 3*4 + namlen);
3055         if (!p)
3056                 goto fail;
3057         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3058         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3059
3060         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3061         switch (nfserr) {
3062         case nfs_ok:
3063                 break;
3064         case nfserr_resource:
3065                 nfserr = nfserr_toosmall;
3066                 goto fail;
3067         case nfserr_noent:
3068                 xdr_truncate_encode(xdr, start_offset);
3069                 goto skip_entry;
3070         default:
3071                 /*
3072                  * If the client requested the RDATTR_ERROR attribute,
3073                  * we stuff the error code into this attribute
3074                  * and continue.  If this attribute was not requested,
3075                  * then in accordance with the spec, we fail the
3076                  * entire READDIR operation(!)
3077                  */
3078                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3079                         goto fail;
3080                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3081                 if (p == NULL) {
3082                         nfserr = nfserr_toosmall;
3083                         goto fail;
3084                 }
3085         }
3086         nfserr = nfserr_toosmall;
3087         entry_bytes = xdr->buf->len - start_offset;
3088         if (entry_bytes > cd->rd_maxcount)
3089                 goto fail;
3090         cd->rd_maxcount -= entry_bytes;
3091         /*
3092          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3093          * let's always let through the first entry, at least:
3094          */
3095         if (!cd->rd_dircount)
3096                 goto fail;
3097         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3098         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3099                 goto fail;
3100         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3101
3102         cd->cookie_offset = cookie_offset;
3103 skip_entry:
3104         cd->common.err = nfs_ok;
3105         return 0;
3106 fail:
3107         xdr_truncate_encode(xdr, start_offset);
3108         cd->common.err = nfserr;
3109         return -EINVAL;
3110 }
3111
3112 static __be32
3113 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3114 {
3115         __be32 *p;
3116
3117         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3118         if (!p)
3119                 return nfserr_resource;
3120         *p++ = cpu_to_be32(sid->si_generation);
3121         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3122                                         sizeof(stateid_opaque_t));
3123         return 0;
3124 }
3125
3126 static __be32
3127 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3128 {
3129         struct xdr_stream *xdr = &resp->xdr;
3130         __be32 *p;
3131
3132         p = xdr_reserve_space(xdr, 8);
3133         if (!p)
3134                 return nfserr_resource;
3135         *p++ = cpu_to_be32(access->ac_supported);
3136         *p++ = cpu_to_be32(access->ac_resp_access);
3137         return 0;
3138 }
3139
3140 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3141 {
3142         struct xdr_stream *xdr = &resp->xdr;
3143         __be32 *p;
3144
3145         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3146         if (!p)
3147                 return nfserr_resource;
3148         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3149                                         NFS4_MAX_SESSIONID_LEN);
3150         *p++ = cpu_to_be32(bcts->dir);
3151         /* Upshifting from TCP to RDMA is not supported */
3152         *p++ = cpu_to_be32(0);
3153         return 0;
3154 }
3155
3156 static __be32
3157 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3158 {
3159         struct xdr_stream *xdr = &resp->xdr;
3160
3161         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3162 }
3163
3164
3165 static __be32
3166 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3167 {
3168         struct xdr_stream *xdr = &resp->xdr;
3169         __be32 *p;
3170
3171         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3172         if (!p)
3173                 return nfserr_resource;
3174         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3175                                                 NFS4_VERIFIER_SIZE);
3176         return 0;
3177 }
3178
3179 static __be32
3180 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3181 {
3182         struct xdr_stream *xdr = &resp->xdr;
3183         __be32 *p;
3184
3185         p = xdr_reserve_space(xdr, 20);
3186         if (!p)
3187                 return nfserr_resource;
3188         encode_cinfo(p, &create->cr_cinfo);
3189         nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3190                         create->cr_bmval[1], create->cr_bmval[2]);
3191         return 0;
3192 }
3193
3194 static __be32
3195 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3196 {
3197         struct svc_fh *fhp = getattr->ga_fhp;
3198         struct xdr_stream *xdr = &resp->xdr;
3199
3200         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3201                                     getattr->ga_bmval, resp->rqstp, 0);
3202 }
3203
3204 static __be32
3205 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3206 {
3207         struct xdr_stream *xdr = &resp->xdr;
3208         struct svc_fh *fhp = *fhpp;
3209         unsigned int len;
3210         __be32 *p;
3211
3212         len = fhp->fh_handle.fh_size;
3213         p = xdr_reserve_space(xdr, len + 4);
3214         if (!p)
3215                 return nfserr_resource;
3216         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3217         return 0;
3218 }
3219
3220 /*
3221 * Including all fields other than the name, a LOCK4denied structure requires
3222 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3223 */
3224 static __be32
3225 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3226 {
3227         struct xdr_netobj *conf = &ld->ld_owner;
3228         __be32 *p;
3229
3230 again:
3231         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3232         if (!p) {
3233                 /*
3234                  * Don't fail to return the result just because we can't
3235                  * return the conflicting open:
3236                  */
3237                 if (conf->len) {
3238                         kfree(conf->data);
3239                         conf->len = 0;
3240                         conf->data = NULL;
3241                         goto again;
3242                 }
3243                 return nfserr_resource;
3244         }
3245         p = xdr_encode_hyper(p, ld->ld_start);
3246         p = xdr_encode_hyper(p, ld->ld_length);
3247         *p++ = cpu_to_be32(ld->ld_type);
3248         if (conf->len) {
3249                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3250                 p = xdr_encode_opaque(p, conf->data, conf->len);
3251                 kfree(conf->data);
3252         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3253                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3254                 *p++ = cpu_to_be32(0); /* length of owner name */
3255         }
3256         return nfserr_denied;
3257 }
3258
3259 static __be32
3260 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3261 {
3262         struct xdr_stream *xdr = &resp->xdr;
3263
3264         if (!nfserr)
3265                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3266         else if (nfserr == nfserr_denied)
3267                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3268
3269         return nfserr;
3270 }
3271
3272 static __be32
3273 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3274 {
3275         struct xdr_stream *xdr = &resp->xdr;
3276
3277         if (nfserr == nfserr_denied)
3278                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3279         return nfserr;
3280 }
3281
3282 static __be32
3283 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3284 {
3285         struct xdr_stream *xdr = &resp->xdr;
3286
3287         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3288 }
3289
3290
3291 static __be32
3292 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3293 {
3294         struct xdr_stream *xdr = &resp->xdr;
3295         __be32 *p;
3296
3297         p = xdr_reserve_space(xdr, 20);
3298         if (!p)
3299                 return nfserr_resource;
3300         p = encode_cinfo(p, &link->li_cinfo);
3301         return 0;
3302 }
3303
3304
3305 static __be32
3306 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3307 {
3308         struct xdr_stream *xdr = &resp->xdr;
3309         __be32 *p;
3310
3311         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3312         if (nfserr)
3313                 return nfserr;
3314         p = xdr_reserve_space(xdr, 24);
3315         if (!p)
3316                 return nfserr_resource;
3317         p = encode_cinfo(p, &open->op_cinfo);
3318         *p++ = cpu_to_be32(open->op_rflags);
3319
3320         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3321                                         open->op_bmval[2]);
3322         if (nfserr)
3323                 return nfserr;
3324
3325         p = xdr_reserve_space(xdr, 4);
3326         if (!p)
3327                 return nfserr_resource;
3328
3329         *p++ = cpu_to_be32(open->op_delegate_type);
3330         switch (open->op_delegate_type) {
3331         case NFS4_OPEN_DELEGATE_NONE:
3332                 break;
3333         case NFS4_OPEN_DELEGATE_READ:
3334                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3335                 if (nfserr)
3336                         return nfserr;
3337                 p = xdr_reserve_space(xdr, 20);
3338                 if (!p)
3339                         return nfserr_resource;
3340                 *p++ = cpu_to_be32(open->op_recall);
3341
3342                 /*
3343                  * TODO: ACE's in delegations
3344                  */
3345                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3346                 *p++ = cpu_to_be32(0);
3347                 *p++ = cpu_to_be32(0);
3348                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3349                 break;
3350         case NFS4_OPEN_DELEGATE_WRITE:
3351                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3352                 if (nfserr)
3353                         return nfserr;
3354                 p = xdr_reserve_space(xdr, 32);
3355                 if (!p)
3356                         return nfserr_resource;
3357                 *p++ = cpu_to_be32(0);
3358
3359                 /*
3360                  * TODO: space_limit's in delegations
3361                  */
3362                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3363                 *p++ = cpu_to_be32(~(u32)0);
3364                 *p++ = cpu_to_be32(~(u32)0);
3365
3366                 /*
3367                  * TODO: ACE's in delegations
3368                  */
3369                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3370                 *p++ = cpu_to_be32(0);
3371                 *p++ = cpu_to_be32(0);
3372                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3373                 break;
3374         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3375                 switch (open->op_why_no_deleg) {
3376                 case WND4_CONTENTION:
3377                 case WND4_RESOURCE:
3378                         p = xdr_reserve_space(xdr, 8);
3379                         if (!p)
3380                                 return nfserr_resource;
3381                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3382                         /* deleg signaling not supported yet: */
3383                         *p++ = cpu_to_be32(0);
3384                         break;
3385                 default:
3386                         p = xdr_reserve_space(xdr, 4);
3387                         if (!p)
3388                                 return nfserr_resource;
3389                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3390                 }
3391                 break;
3392         default:
3393                 BUG();
3394         }
3395         /* XXX save filehandle here */
3396         return 0;
3397 }
3398
3399 static __be32
3400 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3401 {
3402         struct xdr_stream *xdr = &resp->xdr;
3403
3404         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3405 }
3406
3407 static __be32
3408 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3409 {
3410         struct xdr_stream *xdr = &resp->xdr;
3411
3412         return nfsd4_encode_stateid(xdr, &od->od_stateid);
3413 }
3414
3415 static __be32 nfsd4_encode_splice_read(
3416                                 struct nfsd4_compoundres *resp,
3417                                 struct nfsd4_read *read,
3418                                 struct file *file, unsigned long maxcount)
3419 {
3420         struct xdr_stream *xdr = &resp->xdr;
3421         struct xdr_buf *buf = xdr->buf;
3422         u32 eof;
3423         long len;
3424         int space_left;
3425         __be32 nfserr;
3426         __be32 *p = xdr->p - 2;
3427
3428         /* Make sure there will be room for padding if needed */
3429         if (xdr->end - xdr->p < 1)
3430                 return nfserr_resource;
3431
3432         len = maxcount;
3433         nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3434                                   file, read->rd_offset, &maxcount);
3435         read->rd_length = maxcount;
3436         if (nfserr) {
3437                 /*
3438                  * nfsd_splice_actor may have already messed with the
3439                  * page length; reset it so as not to confuse
3440                  * xdr_truncate_encode:
3441                  */
3442                 buf->page_len = 0;
3443                 return nfserr;
3444         }
3445
3446         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3447                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3448
3449         *(p++) = htonl(eof);
3450         *(p++) = htonl(maxcount);
3451
3452         buf->page_len = maxcount;
3453         buf->len += maxcount;
3454         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3455                                                         / PAGE_SIZE;
3456
3457         /* Use rest of head for padding and remaining ops: */
3458         buf->tail[0].iov_base = xdr->p;
3459         buf->tail[0].iov_len = 0;
3460         xdr->iov = buf->tail;
3461         if (maxcount&3) {
3462                 int pad = 4 - (maxcount&3);
3463
3464                 *(xdr->p++) = 0;
3465
3466                 buf->tail[0].iov_base += maxcount&3;
3467                 buf->tail[0].iov_len = pad;
3468                 buf->len += pad;
3469         }
3470
3471         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3472                                 buf->buflen - buf->len);
3473         buf->buflen = buf->len + space_left;
3474         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3475
3476         return 0;
3477 }
3478
3479 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3480                                  struct nfsd4_read *read,
3481                                  struct file *file, unsigned long maxcount)
3482 {
3483         struct xdr_stream *xdr = &resp->xdr;
3484         u32 eof;
3485         int v;
3486         int starting_len = xdr->buf->len - 8;
3487         long len;
3488         int thislen;
3489         __be32 nfserr;
3490         __be32 tmp;
3491         __be32 *p;
3492         u32 zzz = 0;
3493         int pad;
3494
3495         len = maxcount;
3496         v = 0;
3497
3498         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3499         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3500         WARN_ON_ONCE(!p);
3501         resp->rqstp->rq_vec[v].iov_base = p;
3502         resp->rqstp->rq_vec[v].iov_len = thislen;
3503         v++;
3504         len -= thislen;
3505
3506         while (len) {
3507                 thislen = min_t(long, len, PAGE_SIZE);
3508                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3509                 WARN_ON_ONCE(!p);
3510                 resp->rqstp->rq_vec[v].iov_base = p;
3511                 resp->rqstp->rq_vec[v].iov_len = thislen;
3512                 v++;
3513                 len -= thislen;
3514         }
3515         read->rd_vlen = v;
3516
3517         len = maxcount;
3518         nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3519                             resp->rqstp->rq_vec, read->rd_vlen, &maxcount);
3520         read->rd_length = maxcount;
3521         if (nfserr)
3522                 return nfserr;
3523         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3524
3525         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3526                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3527
3528         tmp = htonl(eof);
3529         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3530         tmp = htonl(maxcount);
3531         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3532
3533         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3534         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3535                                                                 &zzz, pad);
3536         return 0;
3537
3538 }
3539
3540 static __be32
3541 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3542                   struct nfsd4_read *read)
3543 {
3544         unsigned long maxcount;
3545         struct xdr_stream *xdr = &resp->xdr;
3546         struct file *file = read->rd_filp;
3547         int starting_len = xdr->buf->len;
3548         struct raparms *ra = NULL;
3549         __be32 *p;
3550
3551         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3552         if (!p) {
3553                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3554                 return nfserr_resource;
3555         }
3556         if (resp->xdr.buf->page_len &&
3557             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3558                 WARN_ON_ONCE(1);
3559                 return nfserr_resource;
3560         }
3561         xdr_commit_encode(xdr);
3562
3563         maxcount = svc_max_payload(resp->rqstp);
3564         maxcount = min_t(unsigned long, maxcount,
3565                          (xdr->buf->buflen - xdr->buf->len));
3566         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3567
3568         if (read->rd_tmp_file)
3569                 ra = nfsd_init_raparms(file);
3570
3571         if (file->f_op->splice_read &&
3572             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3573                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3574         else
3575                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3576
3577         if (ra)
3578                 nfsd_put_raparams(file, ra);
3579
3580         if (nfserr)
3581                 xdr_truncate_encode(xdr, starting_len);
3582
3583         return nfserr;
3584 }
3585
3586 static __be32
3587 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3588 {
3589         int maxcount;
3590         __be32 wire_count;
3591         int zero = 0;
3592         struct xdr_stream *xdr = &resp->xdr;
3593         int length_offset = xdr->buf->len;
3594         __be32 *p;
3595
3596         p = xdr_reserve_space(xdr, 4);
3597         if (!p)
3598                 return nfserr_resource;
3599         maxcount = PAGE_SIZE;
3600
3601         p = xdr_reserve_space(xdr, maxcount);
3602         if (!p)
3603                 return nfserr_resource;
3604         /*
3605          * XXX: By default, vfs_readlink() will truncate symlinks if they
3606          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
3607          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3608          * that truncation occurred, and return NFS4ERR_RESOURCE.
3609          */
3610         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3611                                                 (char *)p, &maxcount);
3612         if (nfserr == nfserr_isdir)
3613                 nfserr = nfserr_inval;
3614         if (nfserr) {
3615                 xdr_truncate_encode(xdr, length_offset);
3616                 return nfserr;
3617         }
3618
3619         wire_count = htonl(maxcount);
3620         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3621         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3622         if (maxcount & 3)
3623                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3624                                                 &zero, 4 - (maxcount&3));
3625         return 0;
3626 }
3627
3628 static __be32
3629 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3630 {
3631         int maxcount;
3632         int bytes_left;
3633         loff_t offset;
3634         __be64 wire_offset;
3635         struct xdr_stream *xdr = &resp->xdr;
3636         int starting_len = xdr->buf->len;
3637         __be32 *p;
3638
3639         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3640         if (!p)
3641                 return nfserr_resource;
3642
3643         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3644         *p++ = cpu_to_be32(0);
3645         *p++ = cpu_to_be32(0);
3646         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3647                                 - (char *)resp->xdr.buf->head[0].iov_base;
3648
3649         /*
3650          * Number of bytes left for directory entries allowing for the
3651          * final 8 bytes of the readdir and a following failed op:
3652          */
3653         bytes_left = xdr->buf->buflen - xdr->buf->len
3654                         - COMPOUND_ERR_SLACK_SPACE - 8;
3655         if (bytes_left < 0) {
3656                 nfserr = nfserr_resource;
3657                 goto err_no_verf;
3658         }
3659         maxcount = svc_max_payload(resp->rqstp);
3660         maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3661         /*
3662          * Note the rfc defines rd_maxcount as the size of the
3663          * READDIR4resok structure, which includes the verifier above
3664          * and the 8 bytes encoded at the end of this function:
3665          */
3666         if (maxcount < 16) {
3667                 nfserr = nfserr_toosmall;
3668                 goto err_no_verf;
3669         }
3670         maxcount = min_t(int, maxcount-16, bytes_left);
3671
3672         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3673         if (!readdir->rd_dircount)
3674                 readdir->rd_dircount = svc_max_payload(resp->rqstp);
3675
3676         readdir->xdr = xdr;
3677         readdir->rd_maxcount = maxcount;
3678         readdir->common.err = 0;
3679         readdir->cookie_offset = 0;
3680
3681         offset = readdir->rd_cookie;
3682         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3683                               &offset,
3684                               &readdir->common, nfsd4_encode_dirent);
3685         if (nfserr == nfs_ok &&
3686             readdir->common.err == nfserr_toosmall &&
3687             xdr->buf->len == starting_len + 8) {
3688                 /* nothing encoded; which limit did we hit?: */
3689                 if (maxcount - 16 < bytes_left)
3690                         /* It was the fault of rd_maxcount: */
3691                         nfserr = nfserr_toosmall;
3692                 else
3693                         /* We ran out of buffer space: */
3694                         nfserr = nfserr_resource;
3695         }
3696         if (nfserr)
3697                 goto err_no_verf;
3698
3699         if (readdir->cookie_offset) {
3700                 wire_offset = cpu_to_be64(offset);
3701                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3702                                                         &wire_offset, 8);
3703         }
3704
3705         p = xdr_reserve_space(xdr, 8);
3706         if (!p) {
3707                 WARN_ON_ONCE(1);
3708                 goto err_no_verf;
3709         }
3710         *p++ = 0;       /* no more entries */
3711         *p++ = htonl(readdir->common.err == nfserr_eof);
3712
3713         return 0;
3714 err_no_verf:
3715         xdr_truncate_encode(xdr, starting_len);
3716         return nfserr;
3717 }
3718
3719 static __be32
3720 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3721 {
3722         struct xdr_stream *xdr = &resp->xdr;
3723         __be32 *p;
3724
3725         p = xdr_reserve_space(xdr, 20);
3726         if (!p)
3727                 return nfserr_resource;
3728         p = encode_cinfo(p, &remove->rm_cinfo);
3729         return 0;
3730 }
3731
3732 static __be32
3733 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3734 {
3735         struct xdr_stream *xdr = &resp->xdr;
3736         __be32 *p;
3737
3738         p = xdr_reserve_space(xdr, 40);
3739         if (!p)
3740                 return nfserr_resource;
3741         p = encode_cinfo(p, &rename->rn_sinfo);
3742         p = encode_cinfo(p, &rename->rn_tinfo);
3743         return 0;
3744 }
3745
3746 static __be32
3747 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
3748 {
3749         u32 i, nflavs, supported;
3750         struct exp_flavor_info *flavs;
3751         struct exp_flavor_info def_flavs[2];
3752         __be32 *p, *flavorsp;
3753         static bool report = true;
3754
3755         if (exp->ex_nflavors) {
3756                 flavs = exp->ex_flavors;
3757                 nflavs = exp->ex_nflavors;
3758         } else { /* Handling of some defaults in absence of real secinfo: */
3759                 flavs = def_flavs;
3760                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3761                         nflavs = 2;
3762                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3763                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3764                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3765                         nflavs = 1;
3766                         flavs[0].pseudoflavor
3767                                         = svcauth_gss_flavor(exp->ex_client);
3768                 } else {
3769                         nflavs = 1;
3770                         flavs[0].pseudoflavor
3771                                         = exp->ex_client->flavour->flavour;
3772                 }
3773         }
3774
3775         supported = 0;
3776         p = xdr_reserve_space(xdr, 4);
3777         if (!p)
3778                 return nfserr_resource;
3779         flavorsp = p++;         /* to be backfilled later */
3780
3781         for (i = 0; i < nflavs; i++) {
3782                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3783                 struct rpcsec_gss_info info;
3784
3785                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3786                         supported++;
3787                         p = xdr_reserve_space(xdr, 4 + 4 +
3788                                               XDR_LEN(info.oid.len) + 4 + 4);
3789                         if (!p)
3790                                 return nfserr_resource;
3791                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3792                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3793                         *p++ = cpu_to_be32(info.qop);
3794                         *p++ = cpu_to_be32(info.service);
3795                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3796                         supported++;
3797                         p = xdr_reserve_space(xdr, 4);
3798                         if (!p)
3799                                 return nfserr_resource;
3800                         *p++ = cpu_to_be32(pf);
3801                 } else {
3802                         if (report)
3803                                 pr_warn("NFS: SECINFO: security flavor %u "
3804                                         "is not supported\n", pf);
3805                 }
3806         }
3807
3808         if (nflavs != supported)
3809                 report = false;
3810         *flavorsp = htonl(supported);
3811         return 0;
3812 }
3813
3814 static __be32
3815 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3816                      struct nfsd4_secinfo *secinfo)
3817 {
3818         struct xdr_stream *xdr = &resp->xdr;
3819
3820         return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
3821 }
3822
3823 static __be32
3824 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3825                      struct nfsd4_secinfo_no_name *secinfo)
3826 {
3827         struct xdr_stream *xdr = &resp->xdr;
3828
3829         return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
3830 }
3831
3832 /*
3833  * The SETATTR encode routine is special -- it always encodes a bitmap,
3834  * regardless of the error status.
3835  */
3836 static __be32
3837 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3838 {
3839         struct xdr_stream *xdr = &resp->xdr;
3840         __be32 *p;
3841
3842         p = xdr_reserve_space(xdr, 16);
3843         if (!p)
3844                 return nfserr_resource;
3845         if (nfserr) {
3846                 *p++ = cpu_to_be32(3);
3847                 *p++ = cpu_to_be32(0);
3848                 *p++ = cpu_to_be32(0);
3849                 *p++ = cpu_to_be32(0);
3850         }
3851         else {
3852                 *p++ = cpu_to_be32(3);
3853                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3854                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3855                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3856         }
3857         return nfserr;
3858 }
3859
3860 static __be32
3861 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3862 {
3863         struct xdr_stream *xdr = &resp->xdr;
3864         __be32 *p;
3865
3866         if (!nfserr) {
3867                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3868                 if (!p)
3869                         return nfserr_resource;
3870                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3871                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3872                                                 NFS4_VERIFIER_SIZE);
3873         }
3874         else if (nfserr == nfserr_clid_inuse) {
3875                 p = xdr_reserve_space(xdr, 8);
3876                 if (!p)
3877                         return nfserr_resource;
3878                 *p++ = cpu_to_be32(0);
3879                 *p++ = cpu_to_be32(0);
3880         }
3881         return nfserr;
3882 }
3883
3884 static __be32
3885 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3886 {
3887         struct xdr_stream *xdr = &resp->xdr;
3888         __be32 *p;
3889
3890         p = xdr_reserve_space(xdr, 16);
3891         if (!p)
3892                 return nfserr_resource;
3893         *p++ = cpu_to_be32(write->wr_bytes_written);
3894         *p++ = cpu_to_be32(write->wr_how_written);
3895         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3896                                                 NFS4_VERIFIER_SIZE);
3897         return 0;
3898 }
3899
3900 static __be32
3901 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3902                          struct nfsd4_exchange_id *exid)
3903 {
3904         struct xdr_stream *xdr = &resp->xdr;
3905         __be32 *p;
3906         char *major_id;
3907         char *server_scope;
3908         int major_id_sz;
3909         int server_scope_sz;
3910         uint64_t minor_id = 0;
3911
3912         major_id = utsname()->nodename;
3913         major_id_sz = strlen(major_id);
3914         server_scope = utsname()->nodename;
3915         server_scope_sz = strlen(server_scope);
3916
3917         p = xdr_reserve_space(xdr,
3918                 8 /* eir_clientid */ +
3919                 4 /* eir_sequenceid */ +
3920                 4 /* eir_flags */ +
3921                 4 /* spr_how */);
3922         if (!p)
3923                 return nfserr_resource;
3924
3925         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3926         *p++ = cpu_to_be32(exid->seqid);
3927         *p++ = cpu_to_be32(exid->flags);
3928
3929         *p++ = cpu_to_be32(exid->spa_how);
3930
3931         switch (exid->spa_how) {
3932         case SP4_NONE:
3933                 break;
3934         case SP4_MACH_CRED:
3935                 /* spo_must_enforce bitmap: */
3936                 nfserr = nfsd4_encode_bitmap(xdr,
3937                                         exid->spo_must_enforce[0],
3938                                         exid->spo_must_enforce[1],
3939                                         exid->spo_must_enforce[2]);
3940                 if (nfserr)
3941                         return nfserr;
3942                 /* spo_must_allow bitmap: */
3943                 nfserr = nfsd4_encode_bitmap(xdr,
3944                                         exid->spo_must_allow[0],
3945                                         exid->spo_must_allow[1],
3946                                         exid->spo_must_allow[2]);
3947                 if (nfserr)
3948                         return nfserr;
3949                 break;
3950         default:
3951                 WARN_ON_ONCE(1);
3952         }
3953
3954         p = xdr_reserve_space(xdr,
3955                 8 /* so_minor_id */ +
3956                 4 /* so_major_id.len */ +
3957                 (XDR_QUADLEN(major_id_sz) * 4) +
3958                 4 /* eir_server_scope.len */ +
3959                 (XDR_QUADLEN(server_scope_sz) * 4) +
3960                 4 /* eir_server_impl_id.count (0) */);
3961         if (!p)
3962                 return nfserr_resource;
3963
3964         /* The server_owner struct */
3965         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3966         /* major id */
3967         p = xdr_encode_opaque(p, major_id, major_id_sz);
3968
3969         /* Server scope */
3970         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3971
3972         /* Implementation id */
3973         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3974         return 0;
3975 }
3976
3977 static __be32
3978 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3979                             struct nfsd4_create_session *sess)
3980 {
3981         struct xdr_stream *xdr = &resp->xdr;
3982         __be32 *p;
3983
3984         p = xdr_reserve_space(xdr, 24);
3985         if (!p)
3986                 return nfserr_resource;
3987         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3988                                         NFS4_MAX_SESSIONID_LEN);
3989         *p++ = cpu_to_be32(sess->seqid);
3990         *p++ = cpu_to_be32(sess->flags);
3991
3992         p = xdr_reserve_space(xdr, 28);
3993         if (!p)
3994                 return nfserr_resource;
3995         *p++ = cpu_to_be32(0); /* headerpadsz */
3996         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3997         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3998         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3999         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4000         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4001         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4002
4003         if (sess->fore_channel.nr_rdma_attrs) {
4004                 p = xdr_reserve_space(xdr, 4);
4005                 if (!p)
4006                         return nfserr_resource;
4007                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4008         }
4009
4010         p = xdr_reserve_space(xdr, 28);
4011         if (!p)
4012                 return nfserr_resource;
4013         *p++ = cpu_to_be32(0); /* headerpadsz */
4014         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4015         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4016         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4017         *p++ = cpu_to_be32(sess->back_channel.maxops);
4018         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4019         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4020
4021         if (sess->back_channel.nr_rdma_attrs) {
4022                 p = xdr_reserve_space(xdr, 4);
4023                 if (!p)
4024                         return nfserr_resource;
4025                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4026         }
4027         return 0;
4028 }
4029
4030 static __be32
4031 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4032                       struct nfsd4_sequence *seq)
4033 {
4034         struct xdr_stream *xdr = &resp->xdr;
4035         __be32 *p;
4036
4037         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4038         if (!p)
4039                 return nfserr_resource;
4040         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4041                                         NFS4_MAX_SESSIONID_LEN);
4042         *p++ = cpu_to_be32(seq->seqid);
4043         *p++ = cpu_to_be32(seq->slotid);
4044         /* Note slotid's are numbered from zero: */
4045         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4046         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4047         *p++ = cpu_to_be32(seq->status_flags);
4048
4049         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4050         return 0;
4051 }
4052
4053 static __be32
4054 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4055                           struct nfsd4_test_stateid *test_stateid)
4056 {
4057         struct xdr_stream *xdr = &resp->xdr;
4058         struct nfsd4_test_stateid_id *stateid, *next;
4059         __be32 *p;
4060
4061         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4062         if (!p)
4063                 return nfserr_resource;
4064         *p++ = htonl(test_stateid->ts_num_ids);
4065
4066         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4067                 *p++ = stateid->ts_id_status;
4068         }
4069
4070         return 0;
4071 }
4072
4073 #ifdef CONFIG_NFSD_PNFS
4074 static __be32
4075 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4076                 struct nfsd4_getdeviceinfo *gdev)
4077 {
4078         struct xdr_stream *xdr = &resp->xdr;
4079         const struct nfsd4_layout_ops *ops;
4080         u32 starting_len = xdr->buf->len, needed_len;
4081         __be32 *p;
4082
4083         p = xdr_reserve_space(xdr, 4);
4084         if (!p)
4085                 return nfserr_resource;
4086
4087         *p++ = cpu_to_be32(gdev->gd_layout_type);
4088
4089         /* If maxcount is 0 then just update notifications */
4090         if (gdev->gd_maxcount != 0) {
4091                 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4092                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4093                 if (nfserr) {
4094                         /*
4095                          * We don't bother to burden the layout drivers with
4096                          * enforcing gd_maxcount, just tell the client to
4097                          * come back with a bigger buffer if it's not enough.
4098                          */
4099                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4100                                 goto toosmall;
4101                         return nfserr;
4102                 }
4103         }
4104
4105         if (gdev->gd_notify_types) {
4106                 p = xdr_reserve_space(xdr, 4 + 4);
4107                 if (!p)
4108                         return nfserr_resource;
4109                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4110                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4111         } else {
4112                 p = xdr_reserve_space(xdr, 4);
4113                 if (!p)
4114                         return nfserr_resource;
4115                 *p++ = 0;
4116         }
4117
4118         return 0;
4119 toosmall:
4120         dprintk("%s: maxcount too small\n", __func__);
4121         needed_len = xdr->buf->len + 4 /* notifications */;
4122         xdr_truncate_encode(xdr, starting_len);
4123         p = xdr_reserve_space(xdr, 4);
4124         if (!p)
4125                 return nfserr_resource;
4126         *p++ = cpu_to_be32(needed_len);
4127         return nfserr_toosmall;
4128 }
4129
4130 static __be32
4131 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4132                 struct nfsd4_layoutget *lgp)
4133 {
4134         struct xdr_stream *xdr = &resp->xdr;
4135         const struct nfsd4_layout_ops *ops;
4136         __be32 *p;
4137
4138         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4139         if (!p)
4140                 return nfserr_resource;
4141
4142         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4143         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4144         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4145                                     sizeof(stateid_opaque_t));
4146
4147         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4148         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4149         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4150         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4151         *p++ = cpu_to_be32(lgp->lg_layout_type);
4152
4153         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4154         return ops->encode_layoutget(xdr, lgp);
4155 }
4156
4157 static __be32
4158 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4159                           struct nfsd4_layoutcommit *lcp)
4160 {
4161         struct xdr_stream *xdr = &resp->xdr;
4162         __be32 *p;
4163
4164         p = xdr_reserve_space(xdr, 4);
4165         if (!p)
4166                 return nfserr_resource;
4167         *p++ = cpu_to_be32(lcp->lc_size_chg);
4168         if (lcp->lc_size_chg) {
4169                 p = xdr_reserve_space(xdr, 8);
4170                 if (!p)
4171                         return nfserr_resource;
4172                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4173         }
4174
4175         return 0;
4176 }
4177
4178 static __be32
4179 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4180                 struct nfsd4_layoutreturn *lrp)
4181 {
4182         struct xdr_stream *xdr = &resp->xdr;
4183         __be32 *p;
4184
4185         p = xdr_reserve_space(xdr, 4);
4186         if (!p)
4187                 return nfserr_resource;
4188         *p++ = cpu_to_be32(lrp->lrs_present);
4189         if (lrp->lrs_present)
4190                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4191         return 0;
4192 }
4193 #endif /* CONFIG_NFSD_PNFS */
4194
4195 static __be32
4196 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4197 {
4198         __be32 *p;
4199
4200         p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4201         if (!p)
4202                 return nfserr_resource;
4203
4204         *p++ = cpu_to_be32(0);
4205         p = xdr_encode_hyper(p, write->wr_bytes_written);
4206         *p++ = cpu_to_be32(write->wr_stable_how);
4207         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4208                                     NFS4_VERIFIER_SIZE);
4209         return nfs_ok;
4210 }
4211
4212 static __be32
4213 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4214                   struct nfsd4_copy *copy)
4215 {
4216         __be32 *p;
4217
4218         nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
4219         if (nfserr)
4220                 return nfserr;
4221
4222         p = xdr_reserve_space(&resp->xdr, 4 + 4);
4223         *p++ = xdr_one; /* cr_consecutive */
4224         *p++ = cpu_to_be32(copy->cp_synchronous);
4225         return 0;
4226 }
4227
4228 static __be32
4229 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4230                   struct nfsd4_seek *seek)
4231 {
4232         __be32 *p;
4233
4234         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4235         *p++ = cpu_to_be32(seek->seek_eof);
4236         p = xdr_encode_hyper(p, seek->seek_pos);
4237
4238         return 0;
4239 }
4240
4241 static __be32
4242 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4243 {
4244         return nfserr;
4245 }
4246
4247 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4248
4249 /*
4250  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4251  * since we don't need to filter out obsolete ops as this is
4252  * done in the decoding phase.
4253  */
4254 static const nfsd4_enc nfsd4_enc_ops[] = {
4255         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4256         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4257         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4258         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4259         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4260         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4261         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4262         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4263         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4264         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4265         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4266         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4267         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4268         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4269         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4270         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4271         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4272         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4273         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4274         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4275         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4276         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4277         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4278         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4279         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4280         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4281         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4282         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4283         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4284         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4285         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4286         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4287         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4288         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4289         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4290         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4291         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4292
4293         /* NFSv4.1 operations */
4294         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4295         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4296         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4297         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4298         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4299         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4300         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4301 #ifdef CONFIG_NFSD_PNFS
4302         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4303         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4304         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4305         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4306         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4307 #else
4308         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4309         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4310         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4311         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4312         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4313 #endif
4314         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4315         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4316         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4317         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4318         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4319         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4320         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4321
4322         /* NFSv4.2 operations */
4323         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4324         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
4325         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4326         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4327         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4328         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4329         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4330         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4331         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4332         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4333         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4334         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4335         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4336 };
4337
4338 /*
4339  * Calculate whether we still have space to encode repsize bytes.
4340  * There are two considerations:
4341  *     - For NFS versions >=4.1, the size of the reply must stay within
4342  *       session limits
4343  *     - For all NFS versions, we must stay within limited preallocated
4344  *       buffer space.
4345  *
4346  * This is called before the operation is processed, so can only provide
4347  * an upper estimate.  For some nonidempotent operations (such as
4348  * getattr), it's not necessarily a problem if that estimate is wrong,
4349  * as we can fail it after processing without significant side effects.
4350  */
4351 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4352 {
4353         struct xdr_buf *buf = &resp->rqstp->rq_res;
4354         struct nfsd4_slot *slot = resp->cstate.slot;
4355
4356         if (buf->len + respsize <= buf->buflen)
4357                 return nfs_ok;
4358         if (!nfsd4_has_session(&resp->cstate))
4359                 return nfserr_resource;
4360         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4361                 WARN_ON_ONCE(1);
4362                 return nfserr_rep_too_big_to_cache;
4363         }
4364         return nfserr_rep_too_big;
4365 }
4366
4367 void
4368 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4369 {
4370         struct xdr_stream *xdr = &resp->xdr;
4371         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4372         struct svc_rqst *rqstp = resp->rqstp;
4373         const struct nfsd4_operation *opdesc = op->opdesc;
4374         int post_err_offset;
4375         nfsd4_enc encoder;
4376         __be32 *p;
4377
4378         p = xdr_reserve_space(xdr, 8);
4379         if (!p) {
4380                 WARN_ON_ONCE(1);
4381                 return;
4382         }
4383         *p++ = cpu_to_be32(op->opnum);
4384         post_err_offset = xdr->buf->len;
4385
4386         if (op->opnum == OP_ILLEGAL)
4387                 goto status;
4388         if (op->status && opdesc &&
4389                         !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
4390                 goto status;
4391         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4392                !nfsd4_enc_ops[op->opnum]);
4393         encoder = nfsd4_enc_ops[op->opnum];
4394         op->status = encoder(resp, op->status, &op->u);
4395         if (opdesc && opdesc->op_release)
4396                 opdesc->op_release(&op->u);
4397         xdr_commit_encode(xdr);
4398
4399         /* nfsd4_check_resp_size guarantees enough room for error status */
4400         if (!op->status) {
4401                 int space_needed = 0;
4402                 if (!nfsd4_last_compound_op(rqstp))
4403                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4404                 op->status = nfsd4_check_resp_size(resp, space_needed);
4405         }
4406         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4407                 struct nfsd4_slot *slot = resp->cstate.slot;
4408
4409                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4410                         op->status = nfserr_rep_too_big_to_cache;
4411                 else
4412                         op->status = nfserr_rep_too_big;
4413         }
4414         if (op->status == nfserr_resource ||
4415             op->status == nfserr_rep_too_big ||
4416             op->status == nfserr_rep_too_big_to_cache) {
4417                 /*
4418                  * The operation may have already been encoded or
4419                  * partially encoded.  No op returns anything additional
4420                  * in the case of one of these three errors, so we can
4421                  * just truncate back to after the status.  But it's a
4422                  * bug if we had to do this on a non-idempotent op:
4423                  */
4424                 warn_on_nonidempotent_op(op);
4425                 xdr_truncate_encode(xdr, post_err_offset);
4426         }
4427         if (so) {
4428                 int len = xdr->buf->len - post_err_offset;
4429
4430                 so->so_replay.rp_status = op->status;
4431                 so->so_replay.rp_buflen = len;
4432                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4433                                                 so->so_replay.rp_buf, len);
4434         }
4435 status:
4436         /* Note that op->status is already in network byte order: */
4437         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4438 }
4439
4440 /*
4441  * Encode the reply stored in the stateowner reply cache
4442  *
4443  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4444  * previously sent already encoded operation.
4445  */
4446 void
4447 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4448 {
4449         __be32 *p;
4450         struct nfs4_replay *rp = op->replay;
4451
4452         BUG_ON(!rp);
4453
4454         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4455         if (!p) {
4456                 WARN_ON_ONCE(1);
4457                 return;
4458         }
4459         *p++ = cpu_to_be32(op->opnum);
4460         *p++ = rp->rp_status;  /* already xdr'ed */
4461
4462         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4463 }
4464
4465 int
4466 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4467 {
4468         return xdr_ressize_check(rqstp, p);
4469 }
4470
4471 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4472 {
4473         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4474
4475         if (args->ops != args->iops) {
4476                 kfree(args->ops);
4477                 args->ops = args->iops;
4478         }
4479         kfree(args->tmpp);
4480         args->tmpp = NULL;
4481         while (args->to_free) {
4482                 struct svcxdr_tmpbuf *tb = args->to_free;
4483                 args->to_free = tb->next;
4484                 kfree(tb);
4485         }
4486 }
4487
4488 int
4489 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4490 {
4491         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4492
4493         if (rqstp->rq_arg.head[0].iov_len % 4) {
4494                 /* client is nuts */
4495                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4496                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4497                 return 0;
4498         }
4499         args->p = p;
4500         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4501         args->pagelist = rqstp->rq_arg.pages;
4502         args->pagelen = rqstp->rq_arg.page_len;
4503         args->tail = false;
4504         args->tmpp = NULL;
4505         args->to_free = NULL;
4506         args->ops = args->iops;
4507         args->rqstp = rqstp;
4508
4509         return !nfsd4_decode_compound(args);
4510 }
4511
4512 int
4513 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4514 {
4515         /*
4516          * All that remains is to write the tag and operation count...
4517          */
4518         struct nfsd4_compoundres *resp = rqstp->rq_resp;
4519         struct xdr_buf *buf = resp->xdr.buf;
4520
4521         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4522                                  buf->tail[0].iov_len);
4523
4524         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4525
4526         p = resp->tagp;
4527         *p++ = htonl(resp->taglen);
4528         memcpy(p, resp->tag, resp->taglen);
4529         p += XDR_QUADLEN(resp->taglen);
4530         *p++ = htonl(resp->opcnt);
4531
4532         nfsd4_sequence_done(resp);
4533         return 1;
4534 }
4535
4536 /*
4537  * Local variables:
4538  *  c-basic-offset: 8
4539  * End:
4540  */