fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 #include <linux/file.h>
  37 #include <linux/slab.h>
  38 #include <linux/namei.h>
  39 #include <linux/statfs.h>
  40 #include <linux/utsname.h>
  41 #include <linux/pagemap.h>
  42 #include <linux/sunrpc/svcauth_gss.h>
  43
  44 #include "idmap.h"
  45 #include "acl.h"
  46 #include "xdr4.h"
  47 #include "vfs.h"
  48 #include "state.h"
  49 #include "cache.h"
  50 #include "netns.h"
  51 #include "pnfs.h"
  52
  53 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  54 #include <linux/security.h>
  55 #endif
  56
  57
  58 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  59
  60 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                 /* ignore ssp_window and ssp_num_gss_handles: */
1394                 READ_BUF(8);
1395                 break;
1396         default:
1397                 goto xdr_error;
1398         }
1399
1400         /* Ignore Implementation ID */
1401         READ_BUF(4);    /* nfs_impl_id4 array length */
1402         dummy = be32_to_cpup(p++);
1403
1404         if (dummy > 1)
1405                 goto xdr_error;
1406
1407         if (dummy == 1) {
1408                 /* nii_domain */
1409                 READ_BUF(4);
1410                 dummy = be32_to_cpup(p++);
1411                 READ_BUF(dummy);
1412                 p += XDR_QUADLEN(dummy);
1413
1414                 /* nii_name */
1415                 READ_BUF(4);
1416                 dummy = be32_to_cpup(p++);
1417                 READ_BUF(dummy);
1418                 p += XDR_QUADLEN(dummy);
1419
1420                 /* nii_date */
1421                 READ_BUF(12);
1422                 p += 3;
1423         }
1424         DECODE_TAIL;
1425 }
1426
1427 static __be32
1428 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1429                             struct nfsd4_create_session *sess)
1430 {
1431         DECODE_HEAD;
1432         u32 dummy;
1433
1434         READ_BUF(16);
1435         COPYMEM(&sess->clientid, 8);
1436         sess->seqid = be32_to_cpup(p++);
1437         sess->flags = be32_to_cpup(p++);
1438
1439         /* Fore channel attrs */
1440         READ_BUF(28);
1441         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1442         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1443         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1444         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1445         sess->fore_channel.maxops = be32_to_cpup(p++);
1446         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1447         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1448         if (sess->fore_channel.nr_rdma_attrs == 1) {
1449                 READ_BUF(4);
1450                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1451         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1452                 dprintk("Too many fore channel attr bitmaps!\n");
1453                 goto xdr_error;
1454         }
1455
1456         /* Back channel attrs */
1457         READ_BUF(28);
1458         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1459         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1460         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1461         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1462         sess->back_channel.maxops = be32_to_cpup(p++);
1463         sess->back_channel.maxreqs = be32_to_cpup(p++);
1464         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1465         if (sess->back_channel.nr_rdma_attrs == 1) {
1466                 READ_BUF(4);
1467                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1468         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1469                 dprintk("Too many back channel attr bitmaps!\n");
1470                 goto xdr_error;
1471         }
1472
1473         READ_BUF(4);
1474         sess->callback_prog = be32_to_cpup(p++);
1475         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1476         DECODE_TAIL;
1477 }
1478
1479 static __be32
1480 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1481                              struct nfsd4_destroy_session *destroy_session)
1482 {
1483         DECODE_HEAD;
1484         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1485         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1486
1487         DECODE_TAIL;
1488 }
1489
1490 static __be32
1491 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1492                           struct nfsd4_free_stateid *free_stateid)
1493 {
1494         DECODE_HEAD;
1495
1496         READ_BUF(sizeof(stateid_t));
1497         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1498         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1499
1500         DECODE_TAIL;
1501 }
1502
1503 static __be32
1504 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1505                       struct nfsd4_sequence *seq)
1506 {
1507         DECODE_HEAD;
1508
1509         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1510         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1511         seq->seqid = be32_to_cpup(p++);
1512         seq->slotid = be32_to_cpup(p++);
1513         seq->maxslots = be32_to_cpup(p++);
1514         seq->cachethis = be32_to_cpup(p++);
1515
1516         DECODE_TAIL;
1517 }
1518
1519 static __be32
1520 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1521 {
1522         int i;
1523         __be32 *p, status;
1524         struct nfsd4_test_stateid_id *stateid;
1525
1526         READ_BUF(4);
1527         test_stateid->ts_num_ids = ntohl(*p++);
1528
1529         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1530
1531         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1532                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1533                 if (!stateid) {
1534                         status = nfserrno(-ENOMEM);
1535                         goto out;
1536                 }
1537
1538                 INIT_LIST_HEAD(&stateid->ts_id_list);
1539                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1540
1541                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1542                 if (status)
1543                         goto out;
1544         }
1545
1546         status = 0;
1547 out:
1548         return status;
1549 xdr_error:
1550         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1551         status = nfserr_bad_xdr;
1552         goto out;
1553 }
1554
1555 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1556 {
1557         DECODE_HEAD;
1558
1559         READ_BUF(8);
1560         COPYMEM(&dc->clientid, 8);
1561
1562         DECODE_TAIL;
1563 }
1564
1565 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1566 {
1567         DECODE_HEAD;
1568
1569         READ_BUF(4);
1570         rc->rca_one_fs = be32_to_cpup(p++);
1571
1572         DECODE_TAIL;
1573 }
1574
1575 #ifdef CONFIG_NFSD_PNFS
1576 static __be32
1577 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1578                 struct nfsd4_getdeviceinfo *gdev)
1579 {
1580         DECODE_HEAD;
1581         u32 num, i;
1582
1583         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1584         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1585         gdev->gd_layout_type = be32_to_cpup(p++);
1586         gdev->gd_maxcount = be32_to_cpup(p++);
1587         num = be32_to_cpup(p++);
1588         if (num) {
1589                 if (num > 1000)
1590                         goto xdr_error;
1591                 READ_BUF(4 * num);
1592                 gdev->gd_notify_types = be32_to_cpup(p++);
1593                 for (i = 1; i < num; i++) {
1594                         if (be32_to_cpup(p++)) {
1595                                 status = nfserr_inval;
1596                                 goto out;
1597                         }
1598                 }
1599         }
1600         DECODE_TAIL;
1601 }
1602
1603 static __be32
1604 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1605                 struct nfsd4_layoutget *lgp)
1606 {
1607         DECODE_HEAD;
1608
1609         READ_BUF(36);
1610         lgp->lg_signal = be32_to_cpup(p++);
1611         lgp->lg_layout_type = be32_to_cpup(p++);
1612         lgp->lg_seg.iomode = be32_to_cpup(p++);
1613         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1614         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1615         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1616
1617         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1618         if (status)
1619                 return status;
1620
1621         READ_BUF(4);
1622         lgp->lg_maxcount = be32_to_cpup(p++);
1623
1624         DECODE_TAIL;
1625 }
1626
1627 static __be32
1628 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1629                 struct nfsd4_layoutcommit *lcp)
1630 {
1631         DECODE_HEAD;
1632         u32 timechange;
1633
1634         READ_BUF(20);
1635         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1636         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1637         lcp->lc_reclaim = be32_to_cpup(p++);
1638
1639         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1640         if (status)
1641                 return status;
1642
1643         READ_BUF(4);
1644         lcp->lc_newoffset = be32_to_cpup(p++);
1645         if (lcp->lc_newoffset) {
1646                 READ_BUF(8);
1647                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1648         } else
1649                 lcp->lc_last_wr = 0;
1650         READ_BUF(4);
1651         timechange = be32_to_cpup(p++);
1652         if (timechange) {
1653                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1654                 if (status)
1655                         return status;
1656         } else {
1657                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1658         }
1659         READ_BUF(8);
1660         lcp->lc_layout_type = be32_to_cpup(p++);
1661
1662         /*
1663          * Save the layout update in XDR format and let the layout driver deal
1664          * with it later.
1665          */
1666         lcp->lc_up_len = be32_to_cpup(p++);
1667         if (lcp->lc_up_len > 0) {
1668                 READ_BUF(lcp->lc_up_len);
1669                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1670         }
1671
1672         DECODE_TAIL;
1673 }
1674
1675 static __be32
1676 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1677                 struct nfsd4_layoutreturn *lrp)
1678 {
1679         DECODE_HEAD;
1680
1681         READ_BUF(16);
1682         lrp->lr_reclaim = be32_to_cpup(p++);
1683         lrp->lr_layout_type = be32_to_cpup(p++);
1684         lrp->lr_seg.iomode = be32_to_cpup(p++);
1685         lrp->lr_return_type = be32_to_cpup(p++);
1686         if (lrp->lr_return_type == RETURN_FILE) {
1687                 READ_BUF(16);
1688                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1689                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1690
1691                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1692                 if (status)
1693                         return status;
1694
1695                 READ_BUF(4);
1696                 lrp->lrf_body_len = be32_to_cpup(p++);
1697                 if (lrp->lrf_body_len > 0) {
1698                         READ_BUF(lrp->lrf_body_len);
1699                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1700                 }
1701         } else {
1702                 lrp->lr_seg.offset = 0;
1703                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1704         }
1705
1706         DECODE_TAIL;
1707 }
1708 #endif /* CONFIG_NFSD_PNFS */
1709
1710 static __be32
1711 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1712                        struct nfsd4_fallocate *fallocate)
1713 {
1714         DECODE_HEAD;
1715
1716         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1717         if (status)
1718                 return status;
1719
1720         READ_BUF(16);
1721         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1722         xdr_decode_hyper(p, &fallocate->falloc_length);
1723
1724         DECODE_TAIL;
1725 }
1726
1727 static __be32
1728 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1729 {
1730         DECODE_HEAD;
1731
1732         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1733         if (status)
1734                 return status;
1735         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1736         if (status)
1737                 return status;
1738
1739         READ_BUF(8 + 8 + 8);
1740         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1741         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1742         p = xdr_decode_hyper(p, &clone->cl_count);
1743         DECODE_TAIL;
1744 }
1745
1746 static __be32
1747 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1748 {
1749         DECODE_HEAD;
1750         unsigned int tmp;
1751
1752         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1753         if (status)
1754                 return status;
1755         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1756         if (status)
1757                 return status;
1758
1759         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1760         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1761         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1762         p = xdr_decode_hyper(p, &copy->cp_count);
1763         p++; /* ca_consecutive: we always do consecutive copies */
1764         copy->cp_synchronous = be32_to_cpup(p++);
1765         tmp = be32_to_cpup(p); /* Source server list not supported */
1766
1767         DECODE_TAIL;
1768 }
1769
1770 static __be32
1771 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
1772                             struct nfsd4_offload_status *os)
1773 {
1774         return nfsd4_decode_stateid(argp, &os->stateid);
1775 }
1776
1777 static __be32
1778 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1779 {
1780         DECODE_HEAD;
1781
1782         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1783         if (status)
1784                 return status;
1785
1786         READ_BUF(8 + 4);
1787         p = xdr_decode_hyper(p, &seek->seek_offset);
1788         seek->seek_whence = be32_to_cpup(p);
1789
1790         DECODE_TAIL;
1791 }
1792
1793 static __be32
1794 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1795 {
1796         return nfs_ok;
1797 }
1798
1799 static __be32
1800 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1801 {
1802         return nfserr_notsupp;
1803 }
1804
1805 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1806
1807 static const nfsd4_dec nfsd4_dec_ops[] = {
1808         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1809         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1810         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1811         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1812         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1813         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1814         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1815         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1816         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1817         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1818         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1819         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1820         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1821         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1822         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1823         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1824         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1825         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1826         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1827         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1828         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1829         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1830         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1831         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1832         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1833         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1834         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1835         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1836         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1837         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1838         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1839         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1840         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1841         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1842         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1843         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1844         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1845
1846         /* new operations for NFSv4.1 */
1847         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1848         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1849         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1850         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1851         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1852         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1853         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1854 #ifdef CONFIG_NFSD_PNFS
1855         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1856         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1857         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1858         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1859         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1860 #else
1861         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1862         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1863         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1864         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1865         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1866 #endif
1867         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1868         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1869         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1870         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1871         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1872         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1873         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1874
1875         /* new operations for NFSv4.2 */
1876         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1877         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1878         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1879         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1880         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1881         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1882         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1883         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_offload_status,
1884         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_offload_status,
1885         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1886         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1887         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1888         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1889 };
1890
1891 static inline bool
1892 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1893 {
1894         if (op->opnum < FIRST_NFS4_OP)
1895                 return false;
1896         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1897                 return false;
1898         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1899                 return false;
1900         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1901                 return false;
1902         return true;
1903 }
1904
1905 static __be32
1906 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1907 {
1908         DECODE_HEAD;
1909         struct nfsd4_op *op;
1910         bool cachethis = false;
1911         int auth_slack= argp->rqstp->rq_auth_slack;
1912         int max_reply = auth_slack + 8; /* opcnt, status */
1913         int readcount = 0;
1914         int readbytes = 0;
1915         int i;
1916
1917         READ_BUF(4);
1918         argp->taglen = be32_to_cpup(p++);
1919         READ_BUF(argp->taglen);
1920         SAVEMEM(argp->tag, argp->taglen);
1921         READ_BUF(8);
1922         argp->minorversion = be32_to_cpup(p++);
1923         argp->opcnt = be32_to_cpup(p++);
1924         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1925
1926         if (argp->taglen > NFSD4_MAX_TAGLEN)
1927                 goto xdr_error;
1928         /*
1929          * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
1930          * here, so we return success at the xdr level so that
1931          * nfsd4_proc can handle this is an NFS-level error.
1932          */
1933         if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1934                 return 0;
1935
1936         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1937                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1938                 if (!argp->ops) {
1939                         argp->ops = argp->iops;
1940                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1941                         goto xdr_error;
1942                 }
1943         }
1944
1945         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1946                 argp->opcnt = 0;
1947
1948         for (i = 0; i < argp->opcnt; i++) {
1949                 op = &argp->ops[i];
1950                 op->replay = NULL;
1951
1952                 READ_BUF(4);
1953                 op->opnum = be32_to_cpup(p++);
1954
1955                 if (nfsd4_opnum_in_range(argp, op))
1956                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1957                 else {
1958                         op->opnum = OP_ILLEGAL;
1959                         op->status = nfserr_op_illegal;
1960                 }
1961                 op->opdesc = OPDESC(op);
1962                 /*
1963                  * We'll try to cache the result in the DRC if any one
1964                  * op in the compound wants to be cached:
1965                  */
1966                 cachethis |= nfsd4_cache_this_op(op);
1967
1968                 if (op->opnum == OP_READ) {
1969                         readcount++;
1970                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1971                 } else
1972                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1973                 /*
1974                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
1975                  * (Special case because it will just skip encoding this
1976                  * if it runs out of xdr buffer space, and it is the only
1977                  * operation that behaves this way.)
1978                  */
1979                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1980                         max_reply += NFS4_OPAQUE_LIMIT;
1981
1982                 if (op->status) {
1983                         argp->opcnt = i+1;
1984                         break;
1985                 }
1986         }
1987         /* Sessions make the DRC unnecessary: */
1988         if (argp->minorversion)
1989                 cachethis = false;
1990         svc_reserve(argp->rqstp, max_reply + readbytes);
1991         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1992
1993         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1994                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1995
1996         DECODE_TAIL;
1997 }
1998
1999 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
2000                              struct svc_export *exp)
2001 {
2002         if (exp->ex_flags & NFSEXP_V4ROOT) {
2003                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
2004                 *p++ = 0;
2005         } else if (IS_I_VERSION(inode)) {
2006                 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2007         } else {
2008                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2009                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2010         }
2011         return p;
2012 }
2013
2014 /*
2015  * ctime (in NFSv4, time_metadata) is not writeable, and the client
2016  * doesn't really care what resolution could theoretically be stored by
2017  * the filesystem.
2018  *
2019  * The client cares how close together changes can be while still
2020  * guaranteeing ctime changes.  For most filesystems (which have
2021  * timestamps with nanosecond fields) that is limited by the resolution
2022  * of the time returned from current_time() (which I'm assuming to be
2023  * 1/HZ).
2024  */
2025 static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2026 {
2027         struct timespec ts;
2028         u32 ns;
2029
2030         ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2031         ts = ns_to_timespec(ns);
2032
2033         p = xdr_encode_hyper(p, ts.tv_sec);
2034         *p++ = cpu_to_be32(ts.tv_nsec);
2035
2036         return p;
2037 }
2038
2039 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2040 {
2041         *p++ = cpu_to_be32(c->atomic);
2042         if (c->change_supported) {
2043                 p = xdr_encode_hyper(p, c->before_change);
2044                 p = xdr_encode_hyper(p, c->after_change);
2045         } else {
2046                 *p++ = cpu_to_be32(c->before_ctime_sec);
2047                 *p++ = cpu_to_be32(c->before_ctime_nsec);
2048                 *p++ = cpu_to_be32(c->after_ctime_sec);
2049                 *p++ = cpu_to_be32(c->after_ctime_nsec);
2050         }
2051         return p;
2052 }
2053
2054 /* Encode as an array of strings the string given with components
2055  * separated @sep, escaped with esc_enter and esc_exit.
2056  */
2057 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2058                                           char *components, char esc_enter,
2059                                           char esc_exit)
2060 {
2061         __be32 *p;
2062         __be32 pathlen;
2063         int pathlen_offset;
2064         int strlen, count=0;
2065         char *str, *end, *next;
2066
2067         dprintk("nfsd4_encode_components(%s)\n", components);
2068
2069         pathlen_offset = xdr->buf->len;
2070         p = xdr_reserve_space(xdr, 4);
2071         if (!p)
2072                 return nfserr_resource;
2073         p++; /* We will fill this in with @count later */
2074
2075         end = str = components;
2076         while (*end) {
2077                 bool found_esc = false;
2078
2079                 /* try to parse as esc_start, ..., esc_end, sep */
2080                 if (*str == esc_enter) {
2081                         for (; *end && (*end != esc_exit); end++)
2082                                 /* find esc_exit or end of string */;
2083                         next = end + 1;
2084                         if (*end && (!*next || *next == sep)) {
2085                                 str++;
2086                                 found_esc = true;
2087                         }
2088                 }
2089
2090                 if (!found_esc)
2091                         for (; *end && (*end != sep); end++)
2092                                 /* find sep or end of string */;
2093
2094                 strlen = end - str;
2095                 if (strlen) {
2096                         p = xdr_reserve_space(xdr, strlen + 4);
2097                         if (!p)
2098                                 return nfserr_resource;
2099                         p = xdr_encode_opaque(p, str, strlen);
2100                         count++;
2101                 }
2102                 else
2103                         end++;
2104                 if (found_esc)
2105                         end = next;
2106
2107                 str = end;
2108         }
2109         pathlen = htonl(count);
2110         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2111         return 0;
2112 }
2113
2114 /* Encode as an array of strings the string given with components
2115  * separated @sep.
2116  */
2117 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2118                                       char *components)
2119 {
2120         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2121 }
2122
2123 /*
2124  * encode a location element of a fs_locations structure
2125  */
2126 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2127                                         struct nfsd4_fs_location *location)
2128 {
2129         __be32 status;
2130
2131         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2132                                                 '[', ']');
2133         if (status)
2134                 return status;
2135         status = nfsd4_encode_components(xdr, '/', location->path);
2136         if (status)
2137                 return status;
2138         return 0;
2139 }
2140
2141 /*
2142  * Encode a path in RFC3530 'pathname4' format
2143  */
2144 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2145                                 const struct path *root,
2146                                 const struct path *path)
2147 {
2148         struct path cur = *path;
2149         __be32 *p;
2150         struct dentry **components = NULL;
2151         unsigned int ncomponents = 0;
2152         __be32 err = nfserr_jukebox;
2153
2154         dprintk("nfsd4_encode_components(");
2155
2156         path_get(&cur);
2157         /* First walk the path up to the nfsd root, and store the
2158          * dentries/path components in an array.
2159          */
2160         for (;;) {
2161                 if (path_equal(&cur, root))
2162                         break;
2163                 if (cur.dentry == cur.mnt->mnt_root) {
2164                         if (follow_up(&cur))
2165                                 continue;
2166                         goto out_free;
2167                 }
2168                 if ((ncomponents & 15) == 0) {
2169                         struct dentry **new;
2170                         new = krealloc(components,
2171                                         sizeof(*new) * (ncomponents + 16),
2172                                         GFP_KERNEL);
2173                         if (!new)
2174                                 goto out_free;
2175                         components = new;
2176                 }
2177                 components[ncomponents++] = cur.dentry;
2178                 cur.dentry = dget_parent(cur.dentry);
2179         }
2180         err = nfserr_resource;
2181         p = xdr_reserve_space(xdr, 4);
2182         if (!p)
2183                 goto out_free;
2184         *p++ = cpu_to_be32(ncomponents);
2185
2186         while (ncomponents) {
2187                 struct dentry *dentry = components[ncomponents - 1];
2188                 unsigned int len;
2189
2190                 spin_lock(&dentry->d_lock);
2191                 len = dentry->d_name.len;
2192                 p = xdr_reserve_space(xdr, len + 4);
2193                 if (!p) {
2194                         spin_unlock(&dentry->d_lock);
2195                         goto out_free;
2196                 }
2197                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2198                 dprintk("/%pd", dentry);
2199                 spin_unlock(&dentry->d_lock);
2200                 dput(dentry);
2201                 ncomponents--;
2202         }
2203
2204         err = 0;
2205 out_free:
2206         dprintk(")\n");
2207         while (ncomponents)
2208                 dput(components[--ncomponents]);
2209         kfree(components);
2210         path_put(&cur);
2211         return err;
2212 }
2213
2214 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2215                         struct svc_rqst *rqstp, const struct path *path)
2216 {
2217         struct svc_export *exp_ps;
2218         __be32 res;
2219
2220         exp_ps = rqst_find_fsidzero_export(rqstp);
2221         if (IS_ERR(exp_ps))
2222                 return nfserrno(PTR_ERR(exp_ps));
2223         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2224         exp_put(exp_ps);
2225         return res;
2226 }
2227
2228 /*
2229  *  encode a fs_locations structure
2230  */
2231 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2232                         struct svc_rqst *rqstp, struct svc_export *exp)
2233 {
2234         __be32 status;
2235         int i;
2236         __be32 *p;
2237         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2238
2239         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2240         if (status)
2241                 return status;
2242         p = xdr_reserve_space(xdr, 4);
2243         if (!p)
2244                 return nfserr_resource;
2245         *p++ = cpu_to_be32(fslocs->locations_count);
2246         for (i=0; i<fslocs->locations_count; i++) {
2247                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2248                 if (status)
2249                         return status;
2250         }
2251         return 0;
2252 }
2253
2254 static u32 nfs4_file_type(umode_t mode)
2255 {
2256         switch (mode & S_IFMT) {
2257         case S_IFIFO:   return NF4FIFO;
2258         case S_IFCHR:   return NF4CHR;
2259         case S_IFDIR:   return NF4DIR;
2260         case S_IFBLK:   return NF4BLK;
2261         case S_IFLNK:   return NF4LNK;
2262         case S_IFREG:   return NF4REG;
2263         case S_IFSOCK:  return NF4SOCK;
2264         default:        return NF4BAD;
2265         };
2266 }
2267
2268 static inline __be32
2269 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2270                      struct nfs4_ace *ace)
2271 {
2272         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2273                 return nfs4_acl_write_who(xdr, ace->whotype);
2274         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2275                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2276         else
2277                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2278 }
2279
2280 static inline __be32
2281 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2282 {
2283         __be32          *p;
2284         unsigned long   i = hweight_long(layout_types);
2285
2286         p = xdr_reserve_space(xdr, 4 + 4 * i);
2287         if (!p)
2288                 return nfserr_resource;
2289
2290         *p++ = cpu_to_be32(i);
2291
2292         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2293                 if (layout_types & (1 << i))
2294                         *p++ = cpu_to_be32(i);
2295
2296         return 0;
2297 }
2298
2299 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2300                               FATTR4_WORD0_RDATTR_ERROR)
2301 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2302 #define WORD2_ABSENT_FS_ATTRS 0
2303
2304 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2305 static inline __be32
2306 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2307                             void *context, int len)
2308 {
2309         __be32 *p;
2310
2311         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2312         if (!p)
2313                 return nfserr_resource;
2314
2315         /*
2316          * For now we use a 0 here to indicate the null translation; in
2317          * the future we may place a call to translation code here.
2318          */
2319         *p++ = cpu_to_be32(0); /* lfs */
2320         *p++ = cpu_to_be32(0); /* pi */
2321         p = xdr_encode_opaque(p, context, len);
2322         return 0;
2323 }
2324 #else
2325 static inline __be32
2326 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2327                             void *context, int len)
2328 { return 0; }
2329 #endif
2330
2331 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2332 {
2333         /* As per referral draft:  */
2334         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2335             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2336                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2337                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2338                         *rdattr_err = NFSERR_MOVED;
2339                 else
2340                         return nfserr_moved;
2341         }
2342         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2343         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2344         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2345         return 0;
2346 }
2347
2348
2349 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2350 {
2351         struct path path = exp->ex_path;
2352         int err;
2353
2354         path_get(&path);
2355         while (follow_up(&path)) {
2356                 if (path.dentry != path.mnt->mnt_root)
2357                         break;
2358         }
2359         err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2360         path_put(&path);
2361         return err;
2362 }
2363
2364 static __be32
2365 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2366 {
2367         __be32 *p;
2368
2369         if (bmval2) {
2370                 p = xdr_reserve_space(xdr, 16);
2371                 if (!p)
2372                         goto out_resource;
2373                 *p++ = cpu_to_be32(3);
2374                 *p++ = cpu_to_be32(bmval0);
2375                 *p++ = cpu_to_be32(bmval1);
2376                 *p++ = cpu_to_be32(bmval2);
2377         } else if (bmval1) {
2378                 p = xdr_reserve_space(xdr, 12);
2379                 if (!p)
2380                         goto out_resource;
2381                 *p++ = cpu_to_be32(2);
2382                 *p++ = cpu_to_be32(bmval0);
2383                 *p++ = cpu_to_be32(bmval1);
2384         } else {
2385                 p = xdr_reserve_space(xdr, 8);
2386                 if (!p)
2387                         goto out_resource;
2388                 *p++ = cpu_to_be32(1);
2389                 *p++ = cpu_to_be32(bmval0);
2390         }
2391
2392         return 0;
2393 out_resource:
2394         return nfserr_resource;
2395 }
2396
2397 /*
2398  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2399  * ourselves.
2400  */
2401 static __be32
2402 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2403                 struct svc_export *exp,
2404                 struct dentry *dentry, u32 *bmval,
2405                 struct svc_rqst *rqstp, int ignore_crossmnt)
2406 {
2407         u32 bmval0 = bmval[0];
2408         u32 bmval1 = bmval[1];
2409         u32 bmval2 = bmval[2];
2410         struct kstat stat;
2411         struct svc_fh *tempfh = NULL;
2412         struct kstatfs statfs;
2413         __be32 *p;
2414         int starting_len = xdr->buf->len;
2415         int attrlen_offset;
2416         __be32 attrlen;
2417         u32 dummy;
2418         u64 dummy64;
2419         u32 rdattr_err = 0;
2420         __be32 status;
2421         int err;
2422         struct nfs4_acl *acl = NULL;
2423         void *context = NULL;
2424         int contextlen;
2425         bool contextsupport = false;
2426         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2427         u32 minorversion = resp->cstate.minorversion;
2428         struct path path = {
2429                 .mnt    = exp->ex_path.mnt,
2430                 .dentry = dentry,
2431         };
2432         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2433
2434         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2435         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2436
2437         if (exp->ex_fslocs.migrated) {
2438                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2439                 if (status)
2440                         goto out;
2441         }
2442
2443         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2444         if (err)
2445                 goto out_nfserr;
2446         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2447                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2448             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2449                        FATTR4_WORD1_SPACE_TOTAL))) {
2450                 err = vfs_statfs(&path, &statfs);
2451                 if (err)
2452                         goto out_nfserr;
2453         }
2454         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2455                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2456                 status = nfserr_jukebox;
2457                 if (!tempfh)
2458                         goto out;
2459                 fh_init(tempfh, NFS4_FHSIZE);
2460                 status = fh_compose(tempfh, exp, dentry, NULL);
2461                 if (status)
2462                         goto out;
2463                 fhp = tempfh;
2464         }
2465         if (bmval0 & FATTR4_WORD0_ACL) {
2466                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2467                 if (err == -EOPNOTSUPP)
2468                         bmval0 &= ~FATTR4_WORD0_ACL;
2469                 else if (err == -EINVAL) {
2470                         status = nfserr_attrnotsupp;
2471                         goto out;
2472                 } else if (err != 0)
2473                         goto out_nfserr;
2474         }
2475
2476 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2477         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2478              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2479                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2480                         err = security_inode_getsecctx(d_inode(dentry),
2481                                                 &context, &contextlen);
2482                 else
2483                         err = -EOPNOTSUPP;
2484                 contextsupport = (err == 0);
2485                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2486                         if (err == -EOPNOTSUPP)
2487                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2488                         else if (err)
2489                                 goto out_nfserr;
2490                 }
2491         }
2492 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2493
2494         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2495         if (status)
2496                 goto out;
2497
2498         attrlen_offset = xdr->buf->len;
2499         p = xdr_reserve_space(xdr, 4);
2500         if (!p)
2501                 goto out_resource;
2502         p++;                /* to be backfilled later */
2503
2504         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2505                 u32 supp[3];
2506
2507                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2508
2509                 if (!IS_POSIXACL(dentry->d_inode))
2510                         supp[0] &= ~FATTR4_WORD0_ACL;
2511                 if (!contextsupport)
2512                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2513                 if (!supp[2]) {
2514                         p = xdr_reserve_space(xdr, 12);
2515                         if (!p)
2516                                 goto out_resource;
2517                         *p++ = cpu_to_be32(2);
2518                         *p++ = cpu_to_be32(supp[0]);
2519                         *p++ = cpu_to_be32(supp[1]);
2520                 } else {
2521                         p = xdr_reserve_space(xdr, 16);
2522                         if (!p)
2523                                 goto out_resource;
2524                         *p++ = cpu_to_be32(3);
2525                         *p++ = cpu_to_be32(supp[0]);
2526                         *p++ = cpu_to_be32(supp[1]);
2527                         *p++ = cpu_to_be32(supp[2]);
2528                 }
2529         }
2530         if (bmval0 & FATTR4_WORD0_TYPE) {
2531                 p = xdr_reserve_space(xdr, 4);
2532                 if (!p)
2533                         goto out_resource;
2534                 dummy = nfs4_file_type(stat.mode);
2535                 if (dummy == NF4BAD) {
2536                         status = nfserr_serverfault;
2537                         goto out;
2538                 }
2539                 *p++ = cpu_to_be32(dummy);
2540         }
2541         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2542                 p = xdr_reserve_space(xdr, 4);
2543                 if (!p)
2544                         goto out_resource;
2545                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2546                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2547                 else
2548                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2549                                                 NFS4_FH_VOL_RENAME);
2550         }
2551         if (bmval0 & FATTR4_WORD0_CHANGE) {
2552                 p = xdr_reserve_space(xdr, 8);
2553                 if (!p)
2554                         goto out_resource;
2555                 p = encode_change(p, &stat, d_inode(dentry), exp);
2556         }
2557         if (bmval0 & FATTR4_WORD0_SIZE) {
2558                 p = xdr_reserve_space(xdr, 8);
2559                 if (!p)
2560                         goto out_resource;
2561                 p = xdr_encode_hyper(p, stat.size);
2562         }
2563         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2564                 p = xdr_reserve_space(xdr, 4);
2565                 if (!p)
2566                         goto out_resource;
2567                 *p++ = cpu_to_be32(1);
2568         }
2569         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2570                 p = xdr_reserve_space(xdr, 4);
2571                 if (!p)
2572                         goto out_resource;
2573                 *p++ = cpu_to_be32(1);
2574         }
2575         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
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_FSID) {
2582                 p = xdr_reserve_space(xdr, 16);
2583                 if (!p)
2584                         goto out_resource;
2585                 if (exp->ex_fslocs.migrated) {
2586                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2587                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2588                 } else switch(fsid_source(fhp)) {
2589                 case FSIDSOURCE_FSID:
2590                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2591                         p = xdr_encode_hyper(p, (u64)0);
2592                         break;
2593                 case FSIDSOURCE_DEV:
2594                         *p++ = cpu_to_be32(0);
2595                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2596                         *p++ = cpu_to_be32(0);
2597                         *p++ = cpu_to_be32(MINOR(stat.dev));
2598                         break;
2599                 case FSIDSOURCE_UUID:
2600                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2601                                                                 EX_UUID_LEN);
2602                         break;
2603                 }
2604         }
2605         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2606                 p = xdr_reserve_space(xdr, 4);
2607                 if (!p)
2608                         goto out_resource;
2609                 *p++ = cpu_to_be32(0);
2610         }
2611         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2612                 p = xdr_reserve_space(xdr, 4);
2613                 if (!p)
2614                         goto out_resource;
2615                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2616         }
2617         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2618                 p = xdr_reserve_space(xdr, 4);
2619                 if (!p)
2620                         goto out_resource;
2621                 *p++ = cpu_to_be32(rdattr_err);
2622         }
2623         if (bmval0 & FATTR4_WORD0_ACL) {
2624                 struct nfs4_ace *ace;
2625
2626                 if (acl == NULL) {
2627                         p = xdr_reserve_space(xdr, 4);
2628                         if (!p)
2629                                 goto out_resource;
2630
2631                         *p++ = cpu_to_be32(0);
2632                         goto out_acl;
2633                 }
2634                 p = xdr_reserve_space(xdr, 4);
2635                 if (!p)
2636                         goto out_resource;
2637                 *p++ = cpu_to_be32(acl->naces);
2638
2639                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2640                         p = xdr_reserve_space(xdr, 4*3);
2641                         if (!p)
2642                                 goto out_resource;
2643                         *p++ = cpu_to_be32(ace->type);
2644                         *p++ = cpu_to_be32(ace->flag);
2645                         *p++ = cpu_to_be32(ace->access_mask &
2646                                                         NFS4_ACE_MASK_ALL);
2647                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2648                         if (status)
2649                                 goto out;
2650                 }
2651         }
2652 out_acl:
2653         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2654                 p = xdr_reserve_space(xdr, 4);
2655                 if (!p)
2656                         goto out_resource;
2657                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2658                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2659         }
2660         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2661                 p = xdr_reserve_space(xdr, 4);
2662                 if (!p)
2663                         goto out_resource;
2664                 *p++ = cpu_to_be32(1);
2665         }
2666         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2667                 p = xdr_reserve_space(xdr, 4);
2668                 if (!p)
2669                         goto out_resource;
2670                 *p++ = cpu_to_be32(0);
2671         }
2672         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2673                 p = xdr_reserve_space(xdr, 4);
2674                 if (!p)
2675                         goto out_resource;
2676                 *p++ = cpu_to_be32(1);
2677         }
2678         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2679                 p = xdr_reserve_space(xdr, 4);
2680                 if (!p)
2681                         goto out_resource;
2682                 *p++ = cpu_to_be32(1);
2683         }
2684         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2685                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2686                 if (!p)
2687                         goto out_resource;
2688                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2689                                         fhp->fh_handle.fh_size);
2690         }
2691         if (bmval0 & FATTR4_WORD0_FILEID) {
2692                 p = xdr_reserve_space(xdr, 8);
2693                 if (!p)
2694                         goto out_resource;
2695                 p = xdr_encode_hyper(p, stat.ino);
2696         }
2697         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2698                 p = xdr_reserve_space(xdr, 8);
2699                 if (!p)
2700                         goto out_resource;
2701                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2702         }
2703         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2704                 p = xdr_reserve_space(xdr, 8);
2705                 if (!p)
2706                         goto out_resource;
2707                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2708         }
2709         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2710                 p = xdr_reserve_space(xdr, 8);
2711                 if (!p)
2712                         goto out_resource;
2713                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2714         }
2715         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2716                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2717                 if (status)
2718                         goto out;
2719         }
2720         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2721                 p = xdr_reserve_space(xdr, 4);
2722                 if (!p)
2723                         goto out_resource;
2724                 *p++ = cpu_to_be32(1);
2725         }
2726         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2727                 p = xdr_reserve_space(xdr, 8);
2728                 if (!p)
2729                         goto out_resource;
2730                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2731         }
2732         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2733                 p = xdr_reserve_space(xdr, 4);
2734                 if (!p)
2735                         goto out_resource;
2736                 *p++ = cpu_to_be32(255);
2737         }
2738         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2739                 p = xdr_reserve_space(xdr, 4);
2740                 if (!p)
2741                         goto out_resource;
2742                 *p++ = cpu_to_be32(statfs.f_namelen);
2743         }
2744         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2745                 p = xdr_reserve_space(xdr, 8);
2746                 if (!p)
2747                         goto out_resource;
2748                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2749         }
2750         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2751                 p = xdr_reserve_space(xdr, 8);
2752                 if (!p)
2753                         goto out_resource;
2754                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2755         }
2756         if (bmval1 & FATTR4_WORD1_MODE) {
2757                 p = xdr_reserve_space(xdr, 4);
2758                 if (!p)
2759                         goto out_resource;
2760                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2761         }
2762         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2763                 p = xdr_reserve_space(xdr, 4);
2764                 if (!p)
2765                         goto out_resource;
2766                 *p++ = cpu_to_be32(1);
2767         }
2768         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2769                 p = xdr_reserve_space(xdr, 4);
2770                 if (!p)
2771                         goto out_resource;
2772                 *p++ = cpu_to_be32(stat.nlink);
2773         }
2774         if (bmval1 & FATTR4_WORD1_OWNER) {
2775                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2776                 if (status)
2777                         goto out;
2778         }
2779         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2780                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2781                 if (status)
2782                         goto out;
2783         }
2784         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2785                 p = xdr_reserve_space(xdr, 8);
2786                 if (!p)
2787                         goto out_resource;
2788                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2789                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2790         }
2791         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2792                 p = xdr_reserve_space(xdr, 8);
2793                 if (!p)
2794                         goto out_resource;
2795                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2796                 p = xdr_encode_hyper(p, dummy64);
2797         }
2798         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2799                 p = xdr_reserve_space(xdr, 8);
2800                 if (!p)
2801                         goto out_resource;
2802                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2803                 p = xdr_encode_hyper(p, dummy64);
2804         }
2805         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2806                 p = xdr_reserve_space(xdr, 8);
2807                 if (!p)
2808                         goto out_resource;
2809                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2810                 p = xdr_encode_hyper(p, dummy64);
2811         }
2812         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2813                 p = xdr_reserve_space(xdr, 8);
2814                 if (!p)
2815                         goto out_resource;
2816                 dummy64 = (u64)stat.blocks << 9;
2817                 p = xdr_encode_hyper(p, dummy64);
2818         }
2819         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2820                 p = xdr_reserve_space(xdr, 12);
2821                 if (!p)
2822                         goto out_resource;
2823                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2824                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2825         }
2826         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2827                 p = xdr_reserve_space(xdr, 12);
2828                 if (!p)
2829                         goto out_resource;
2830                 p = encode_time_delta(p, d_inode(dentry));
2831         }
2832         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2833                 p = xdr_reserve_space(xdr, 12);
2834                 if (!p)
2835                         goto out_resource;
2836                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2837                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2838         }
2839         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2840                 p = xdr_reserve_space(xdr, 12);
2841                 if (!p)
2842                         goto out_resource;
2843                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2844                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2845         }
2846         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2847                 struct kstat parent_stat;
2848                 u64 ino = stat.ino;
2849
2850                 p = xdr_reserve_space(xdr, 8);
2851                 if (!p)
2852                         goto out_resource;
2853                 /*
2854                  * Get parent's attributes if not ignoring crossmount
2855                  * and this is the root of a cross-mounted filesystem.
2856                  */
2857                 if (ignore_crossmnt == 0 &&
2858                     dentry == exp->ex_path.mnt->mnt_root) {
2859                         err = get_parent_attributes(exp, &parent_stat);
2860                         if (err)
2861                                 goto out_nfserr;
2862                         ino = parent_stat.ino;
2863                 }
2864                 p = xdr_encode_hyper(p, ino);
2865         }
2866 #ifdef CONFIG_NFSD_PNFS
2867         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2868                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2869                 if (status)
2870                         goto out;
2871         }
2872
2873         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2874                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2875                 if (status)
2876                         goto out;
2877         }
2878
2879         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2880                 p = xdr_reserve_space(xdr, 4);
2881                 if (!p)
2882                         goto out_resource;
2883                 *p++ = cpu_to_be32(stat.blksize);
2884         }
2885 #endif /* CONFIG_NFSD_PNFS */
2886         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2887                 u32 supp[3];
2888
2889                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2890                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2891                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2892                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2893
2894                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2895                 if (status)
2896                         goto out;
2897         }
2898
2899         if (bmval2 & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
2900                 p = xdr_reserve_space(xdr, 4);
2901                 if (!p)
2902                         goto out_resource;
2903                 if (IS_I_VERSION(d_inode(dentry)))
2904                         *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR);
2905                 else
2906                         *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_TIME_METADATA);
2907         }
2908
2909         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2910                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2911                                                                 contextlen);
2912                 if (status)
2913                         goto out;
2914         }
2915
2916         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2917         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2918         status = nfs_ok;
2919
2920 out:
2921 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2922         if (context)
2923                 security_release_secctx(context, contextlen);
2924 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2925         kfree(acl);
2926         if (tempfh) {
2927                 fh_put(tempfh);
2928                 kfree(tempfh);
2929         }
2930         if (status)
2931                 xdr_truncate_encode(xdr, starting_len);
2932         return status;
2933 out_nfserr:
2934         status = nfserrno(err);
2935         goto out;
2936 out_resource:
2937         status = nfserr_resource;
2938         goto out;
2939 }
2940
2941 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2942                                 struct xdr_buf *buf, __be32 *p, int bytes)
2943 {
2944         xdr->scratch.iov_len = 0;
2945         memset(buf, 0, sizeof(struct xdr_buf));
2946         buf->head[0].iov_base = p;
2947         buf->head[0].iov_len = 0;
2948         buf->len = 0;
2949         xdr->buf = buf;
2950         xdr->iov = buf->head;
2951         xdr->p = p;
2952         xdr->end = (void *)p + bytes;
2953         buf->buflen = bytes;
2954 }
2955
2956 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2957                         struct svc_fh *fhp, struct svc_export *exp,
2958                         struct dentry *dentry, u32 *bmval,
2959                         struct svc_rqst *rqstp, int ignore_crossmnt)
2960 {
2961         struct xdr_buf dummy;
2962         struct xdr_stream xdr;
2963         __be32 ret;
2964
2965         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2966         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2967                                                         ignore_crossmnt);
2968         *p = xdr.p;
2969         return ret;
2970 }
2971
2972 static inline int attributes_need_mount(u32 *bmval)
2973 {
2974         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2975                 return 1;
2976         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2977                 return 1;
2978         return 0;
2979 }
2980
2981 static __be32
2982 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2983                         const char *name, int namlen)
2984 {
2985         struct svc_export *exp = cd->rd_fhp->fh_export;
2986         struct dentry *dentry;
2987         __be32 nfserr;
2988         int ignore_crossmnt = 0;
2989
2990         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2991         if (IS_ERR(dentry))
2992                 return nfserrno(PTR_ERR(dentry));
2993         if (d_really_is_negative(dentry)) {
2994                 /*
2995                  * we're not holding the i_mutex here, so there's
2996                  * a window where this directory entry could have gone
2997                  * away.
2998                  */
2999                 dput(dentry);
3000                 return nfserr_noent;
3001         }
3002
3003         exp_get(exp);
3004         /*
3005          * In the case of a mountpoint, the client may be asking for
3006          * attributes that are only properties of the underlying filesystem
3007          * as opposed to the cross-mounted file system. In such a case,
3008          * we will not follow the cross mount and will fill the attribtutes
3009          * directly from the mountpoint dentry.
3010          */
3011         if (nfsd_mountpoint(dentry, exp)) {
3012                 int err;
3013
3014                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3015                                 && !attributes_need_mount(cd->rd_bmval)) {
3016                         ignore_crossmnt = 1;
3017                         goto out_encode;
3018                 }
3019                 /*
3020                  * Why the heck aren't we just using nfsd_lookup??
3021                  * Different "."/".." handling?  Something else?
3022                  * At least, add a comment here to explain....
3023                  */
3024                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3025                 if (err) {
3026                         nfserr = nfserrno(err);
3027                         goto out_put;
3028                 }
3029                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3030                 if (nfserr)
3031                         goto out_put;
3032
3033         }
3034 out_encode:
3035         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3036                                         cd->rd_rqstp, ignore_crossmnt);
3037 out_put:
3038         dput(dentry);
3039         exp_put(exp);
3040         return nfserr;
3041 }
3042
3043 static __be32 *
3044 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3045 {
3046         __be32 *p;
3047
3048         p = xdr_reserve_space(xdr, 20);
3049         if (!p)
3050                 return NULL;
3051         *p++ = htonl(2);
3052         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3053         *p++ = htonl(0);                         /* bmval1 */
3054
3055         *p++ = htonl(4);     /* attribute length */
3056         *p++ = nfserr;       /* no htonl */
3057         return p;
3058 }
3059
3060 static int
3061 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3062                     loff_t offset, u64 ino, unsigned int d_type)
3063 {
3064         struct readdir_cd *ccd = ccdv;
3065         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3066         struct xdr_stream *xdr = cd->xdr;
3067         int start_offset = xdr->buf->len;
3068         int cookie_offset;
3069         u32 name_and_cookie;
3070         int entry_bytes;
3071         __be32 nfserr = nfserr_toosmall;
3072         __be64 wire_offset;
3073         __be32 *p;
3074
3075         /* In nfsv4, "." and ".." never make it onto the wire.. */
3076         if (name && isdotent(name, namlen)) {
3077                 cd->common.err = nfs_ok;
3078                 return 0;
3079         }
3080
3081         if (cd->cookie_offset) {
3082                 wire_offset = cpu_to_be64(offset);
3083                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3084                                                         &wire_offset, 8);
3085         }
3086
3087         p = xdr_reserve_space(xdr, 4);
3088         if (!p)
3089                 goto fail;
3090         *p++ = xdr_one;                             /* mark entry present */
3091         cookie_offset = xdr->buf->len;
3092         p = xdr_reserve_space(xdr, 3*4 + namlen);
3093         if (!p)
3094                 goto fail;
3095         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3096         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3097
3098         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3099         switch (nfserr) {
3100         case nfs_ok:
3101                 break;
3102         case nfserr_resource:
3103                 nfserr = nfserr_toosmall;
3104                 goto fail;
3105         case nfserr_noent:
3106                 xdr_truncate_encode(xdr, start_offset);
3107                 goto skip_entry;
3108         default:
3109                 /*
3110                  * If the client requested the RDATTR_ERROR attribute,
3111                  * we stuff the error code into this attribute
3112                  * and continue.  If this attribute was not requested,
3113                  * then in accordance with the spec, we fail the
3114                  * entire READDIR operation(!)
3115                  */
3116                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3117                         goto fail;
3118                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3119                 if (p == NULL) {
3120                         nfserr = nfserr_toosmall;
3121                         goto fail;
3122                 }
3123         }
3124         nfserr = nfserr_toosmall;
3125         entry_bytes = xdr->buf->len - start_offset;
3126         if (entry_bytes > cd->rd_maxcount)
3127                 goto fail;
3128         cd->rd_maxcount -= entry_bytes;
3129         /*
3130          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3131          * let's always let through the first entry, at least:
3132          */
3133         if (!cd->rd_dircount)
3134                 goto fail;
3135         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3136         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3137                 goto fail;
3138         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3139
3140         cd->cookie_offset = cookie_offset;
3141 skip_entry:
3142         cd->common.err = nfs_ok;
3143         return 0;
3144 fail:
3145         xdr_truncate_encode(xdr, start_offset);
3146         cd->common.err = nfserr;
3147         return -EINVAL;
3148 }
3149
3150 static __be32
3151 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3152 {
3153         __be32 *p;
3154
3155         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3156         if (!p)
3157                 return nfserr_resource;
3158         *p++ = cpu_to_be32(sid->si_generation);
3159         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3160                                         sizeof(stateid_opaque_t));
3161         return 0;
3162 }
3163
3164 static __be32
3165 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3166 {
3167         struct xdr_stream *xdr = &resp->xdr;
3168         __be32 *p;
3169
3170         p = xdr_reserve_space(xdr, 8);
3171         if (!p)
3172                 return nfserr_resource;
3173         *p++ = cpu_to_be32(access->ac_supported);
3174         *p++ = cpu_to_be32(access->ac_resp_access);
3175         return 0;
3176 }
3177
3178 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3179 {
3180         struct xdr_stream *xdr = &resp->xdr;
3181         __be32 *p;
3182
3183         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3184         if (!p)
3185                 return nfserr_resource;
3186         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3187                                         NFS4_MAX_SESSIONID_LEN);
3188         *p++ = cpu_to_be32(bcts->dir);
3189         /* Upshifting from TCP to RDMA is not supported */
3190         *p++ = cpu_to_be32(0);
3191         return 0;
3192 }
3193
3194 static __be32
3195 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3196 {
3197         struct xdr_stream *xdr = &resp->xdr;
3198
3199         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3200 }
3201
3202
3203 static __be32
3204 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3205 {
3206         struct xdr_stream *xdr = &resp->xdr;
3207         __be32 *p;
3208
3209         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3210         if (!p)
3211                 return nfserr_resource;
3212         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3213                                                 NFS4_VERIFIER_SIZE);
3214         return 0;
3215 }
3216
3217 static __be32
3218 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3219 {
3220         struct xdr_stream *xdr = &resp->xdr;
3221         __be32 *p;
3222
3223         p = xdr_reserve_space(xdr, 20);
3224         if (!p)
3225                 return nfserr_resource;
3226         encode_cinfo(p, &create->cr_cinfo);
3227         nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3228                         create->cr_bmval[1], create->cr_bmval[2]);
3229         return 0;
3230 }
3231
3232 static __be32
3233 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3234 {
3235         struct svc_fh *fhp = getattr->ga_fhp;
3236         struct xdr_stream *xdr = &resp->xdr;
3237
3238         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3239                                     getattr->ga_bmval, resp->rqstp, 0);
3240 }
3241
3242 static __be32
3243 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3244 {
3245         struct xdr_stream *xdr = &resp->xdr;
3246         struct svc_fh *fhp = *fhpp;
3247         unsigned int len;
3248         __be32 *p;
3249
3250         len = fhp->fh_handle.fh_size;
3251         p = xdr_reserve_space(xdr, len + 4);
3252         if (!p)
3253                 return nfserr_resource;
3254         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3255         return 0;
3256 }
3257
3258 /*
3259 * Including all fields other than the name, a LOCK4denied structure requires
3260 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3261 */
3262 static __be32
3263 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3264 {
3265         struct xdr_netobj *conf = &ld->ld_owner;
3266         __be32 *p;
3267
3268 again:
3269         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3270         if (!p) {
3271                 /*
3272                  * Don't fail to return the result just because we can't
3273                  * return the conflicting open:
3274                  */
3275                 if (conf->len) {
3276                         kfree(conf->data);
3277                         conf->len = 0;
3278                         conf->data = NULL;
3279                         goto again;
3280                 }
3281                 return nfserr_resource;
3282         }
3283         p = xdr_encode_hyper(p, ld->ld_start);
3284         p = xdr_encode_hyper(p, ld->ld_length);
3285         *p++ = cpu_to_be32(ld->ld_type);
3286         if (conf->len) {
3287                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3288                 p = xdr_encode_opaque(p, conf->data, conf->len);
3289                 kfree(conf->data);
3290         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3291                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3292                 *p++ = cpu_to_be32(0); /* length of owner name */
3293         }
3294         return nfserr_denied;
3295 }
3296
3297 static __be32
3298 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3299 {
3300         struct xdr_stream *xdr = &resp->xdr;
3301
3302         if (!nfserr)
3303                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3304         else if (nfserr == nfserr_denied)
3305                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3306
3307         return nfserr;
3308 }
3309
3310 static __be32
3311 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3312 {
3313         struct xdr_stream *xdr = &resp->xdr;
3314
3315         if (nfserr == nfserr_denied)
3316                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3317         return nfserr;
3318 }
3319
3320 static __be32
3321 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3322 {
3323         struct xdr_stream *xdr = &resp->xdr;
3324
3325         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3326 }
3327
3328
3329 static __be32
3330 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3331 {
3332         struct xdr_stream *xdr = &resp->xdr;
3333         __be32 *p;
3334
3335         p = xdr_reserve_space(xdr, 20);
3336         if (!p)
3337                 return nfserr_resource;
3338         p = encode_cinfo(p, &link->li_cinfo);
3339         return 0;
3340 }
3341
3342
3343 static __be32
3344 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3345 {
3346         struct xdr_stream *xdr = &resp->xdr;
3347         __be32 *p;
3348
3349         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3350         if (nfserr)
3351                 return nfserr;
3352         p = xdr_reserve_space(xdr, 24);
3353         if (!p)
3354                 return nfserr_resource;
3355         p = encode_cinfo(p, &open->op_cinfo);
3356         *p++ = cpu_to_be32(open->op_rflags);
3357
3358         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3359                                         open->op_bmval[2]);
3360         if (nfserr)
3361                 return nfserr;
3362
3363         p = xdr_reserve_space(xdr, 4);
3364         if (!p)
3365                 return nfserr_resource;
3366
3367         *p++ = cpu_to_be32(open->op_delegate_type);
3368         switch (open->op_delegate_type) {
3369         case NFS4_OPEN_DELEGATE_NONE:
3370                 break;
3371         case NFS4_OPEN_DELEGATE_READ:
3372                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3373                 if (nfserr)
3374                         return nfserr;
3375                 p = xdr_reserve_space(xdr, 20);
3376                 if (!p)
3377                         return nfserr_resource;
3378                 *p++ = cpu_to_be32(open->op_recall);
3379
3380                 /*
3381                  * TODO: ACE's in delegations
3382                  */
3383                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3384                 *p++ = cpu_to_be32(0);
3385                 *p++ = cpu_to_be32(0);
3386                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3387                 break;
3388         case NFS4_OPEN_DELEGATE_WRITE:
3389                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3390                 if (nfserr)
3391                         return nfserr;
3392                 p = xdr_reserve_space(xdr, 32);
3393                 if (!p)
3394                         return nfserr_resource;
3395                 *p++ = cpu_to_be32(0);
3396
3397                 /*
3398                  * TODO: space_limit's in delegations
3399                  */
3400                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3401                 *p++ = cpu_to_be32(~(u32)0);
3402                 *p++ = cpu_to_be32(~(u32)0);
3403
3404                 /*
3405                  * TODO: ACE's in delegations
3406                  */
3407                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3408                 *p++ = cpu_to_be32(0);
3409                 *p++ = cpu_to_be32(0);
3410                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3411                 break;
3412         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3413                 switch (open->op_why_no_deleg) {
3414                 case WND4_CONTENTION:
3415                 case WND4_RESOURCE:
3416                         p = xdr_reserve_space(xdr, 8);
3417                         if (!p)
3418                                 return nfserr_resource;
3419                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3420                         /* deleg signaling not supported yet: */
3421                         *p++ = cpu_to_be32(0);
3422                         break;
3423                 default:
3424                         p = xdr_reserve_space(xdr, 4);
3425                         if (!p)
3426                                 return nfserr_resource;
3427                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3428                 }
3429                 break;
3430         default:
3431                 BUG();
3432         }
3433         /* XXX save filehandle here */
3434         return 0;
3435 }
3436
3437 static __be32
3438 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3439 {
3440         struct xdr_stream *xdr = &resp->xdr;
3441
3442         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3443 }
3444
3445 static __be32
3446 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3447 {
3448         struct xdr_stream *xdr = &resp->xdr;
3449
3450         return nfsd4_encode_stateid(xdr, &od->od_stateid);
3451 }
3452
3453 static __be32 nfsd4_encode_splice_read(
3454                                 struct nfsd4_compoundres *resp,
3455                                 struct nfsd4_read *read,
3456                                 struct file *file, unsigned long maxcount)
3457 {
3458         struct xdr_stream *xdr = &resp->xdr;
3459         struct xdr_buf *buf = xdr->buf;
3460         u32 eof;
3461         long len;
3462         int space_left;
3463         __be32 nfserr;
3464         __be32 *p = xdr->p - 2;
3465
3466         /* Make sure there will be room for padding if needed */
3467         if (xdr->end - xdr->p < 1)
3468                 return nfserr_resource;
3469
3470         len = maxcount;
3471         nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3472                                   file, read->rd_offset, &maxcount);
3473         read->rd_length = maxcount;
3474         if (nfserr) {
3475                 /*
3476                  * nfsd_splice_actor may have already messed with the
3477                  * page length; reset it so as not to confuse
3478                  * xdr_truncate_encode:
3479                  */
3480                 buf->page_len = 0;
3481                 return nfserr;
3482         }
3483
3484         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3485                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3486
3487         *(p++) = htonl(eof);
3488         *(p++) = htonl(maxcount);
3489
3490         buf->page_len = maxcount;
3491         buf->len += maxcount;
3492         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3493                                                         / PAGE_SIZE;
3494
3495         /* Use rest of head for padding and remaining ops: */
3496         buf->tail[0].iov_base = xdr->p;
3497         buf->tail[0].iov_len = 0;
3498         xdr->iov = buf->tail;
3499         if (maxcount&3) {
3500                 int pad = 4 - (maxcount&3);
3501
3502                 *(xdr->p++) = 0;
3503
3504                 buf->tail[0].iov_base += maxcount&3;
3505                 buf->tail[0].iov_len = pad;
3506                 buf->len += pad;
3507         }
3508
3509         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3510                                 buf->buflen - buf->len);
3511         buf->buflen = buf->len + space_left;
3512         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3513
3514         return 0;
3515 }
3516
3517 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3518                                  struct nfsd4_read *read,
3519                                  struct file *file, unsigned long maxcount)
3520 {
3521         struct xdr_stream *xdr = &resp->xdr;
3522         u32 eof;
3523         int v;
3524         int starting_len = xdr->buf->len - 8;
3525         long len;
3526         int thislen;
3527         __be32 nfserr;
3528         __be32 tmp;
3529         __be32 *p;
3530         u32 zzz = 0;
3531         int pad;
3532
3533         len = maxcount;
3534         v = 0;
3535
3536         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3537         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3538         WARN_ON_ONCE(!p);
3539         resp->rqstp->rq_vec[v].iov_base = p;
3540         resp->rqstp->rq_vec[v].iov_len = thislen;
3541         v++;
3542         len -= thislen;
3543
3544         while (len) {
3545                 thislen = min_t(long, len, PAGE_SIZE);
3546                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3547                 WARN_ON_ONCE(!p);
3548                 resp->rqstp->rq_vec[v].iov_base = p;
3549                 resp->rqstp->rq_vec[v].iov_len = thislen;
3550                 v++;
3551                 len -= thislen;
3552         }
3553         read->rd_vlen = v;
3554
3555         len = maxcount;
3556         nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3557                             resp->rqstp->rq_vec, read->rd_vlen, &maxcount);
3558         read->rd_length = maxcount;
3559         if (nfserr)
3560                 return nfserr;
3561         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3562
3563         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3564                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3565
3566         tmp = htonl(eof);
3567         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3568         tmp = htonl(maxcount);
3569         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3570
3571         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3572         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3573                                                                 &zzz, pad);
3574         return 0;
3575
3576 }
3577
3578 static __be32
3579 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3580                   struct nfsd4_read *read)
3581 {
3582         unsigned long maxcount;
3583         struct xdr_stream *xdr = &resp->xdr;
3584         struct file *file = read->rd_filp;
3585         int starting_len = xdr->buf->len;
3586         struct raparms *ra = NULL;
3587         __be32 *p;
3588
3589         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3590         if (!p) {
3591                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3592                 return nfserr_resource;
3593         }
3594         if (resp->xdr.buf->page_len &&
3595             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3596                 WARN_ON_ONCE(1);
3597                 return nfserr_resource;
3598         }
3599         xdr_commit_encode(xdr);
3600
3601         maxcount = svc_max_payload(resp->rqstp);
3602         maxcount = min_t(unsigned long, maxcount,
3603                          (xdr->buf->buflen - xdr->buf->len));
3604         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3605
3606         if (read->rd_tmp_file)
3607                 ra = nfsd_init_raparms(file);
3608
3609         if (file->f_op->splice_read &&
3610             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3611                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3612         else
3613                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3614
3615         if (ra)
3616                 nfsd_put_raparams(file, ra);
3617
3618         if (nfserr)
3619                 xdr_truncate_encode(xdr, starting_len);
3620
3621         return nfserr;
3622 }
3623
3624 static __be32
3625 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3626 {
3627         int maxcount;
3628         __be32 wire_count;
3629         int zero = 0;
3630         struct xdr_stream *xdr = &resp->xdr;
3631         int length_offset = xdr->buf->len;
3632         __be32 *p;
3633
3634         p = xdr_reserve_space(xdr, 4);
3635         if (!p)
3636                 return nfserr_resource;
3637         maxcount = PAGE_SIZE;
3638
3639         p = xdr_reserve_space(xdr, maxcount);
3640         if (!p)
3641                 return nfserr_resource;
3642         /*
3643          * XXX: By default, vfs_readlink() will truncate symlinks if they
3644          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
3645          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3646          * that truncation occurred, and return NFS4ERR_RESOURCE.
3647          */
3648         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3649                                                 (char *)p, &maxcount);
3650         if (nfserr == nfserr_isdir)
3651                 nfserr = nfserr_inval;
3652         if (nfserr) {
3653                 xdr_truncate_encode(xdr, length_offset);
3654                 return nfserr;
3655         }
3656
3657         wire_count = htonl(maxcount);
3658         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3659         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3660         if (maxcount & 3)
3661                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3662                                                 &zero, 4 - (maxcount&3));
3663         return 0;
3664 }
3665
3666 static __be32
3667 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3668 {
3669         int maxcount;
3670         int bytes_left;
3671         loff_t offset;
3672         __be64 wire_offset;
3673         struct xdr_stream *xdr = &resp->xdr;
3674         int starting_len = xdr->buf->len;
3675         __be32 *p;
3676
3677         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3678         if (!p)
3679                 return nfserr_resource;
3680
3681         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3682         *p++ = cpu_to_be32(0);
3683         *p++ = cpu_to_be32(0);
3684         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3685                                 - (char *)resp->xdr.buf->head[0].iov_base;
3686
3687         /*
3688          * Number of bytes left for directory entries allowing for the
3689          * final 8 bytes of the readdir and a following failed op:
3690          */
3691         bytes_left = xdr->buf->buflen - xdr->buf->len
3692                         - COMPOUND_ERR_SLACK_SPACE - 8;
3693         if (bytes_left < 0) {
3694                 nfserr = nfserr_resource;
3695                 goto err_no_verf;
3696         }
3697         maxcount = svc_max_payload(resp->rqstp);
3698         maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3699         /*
3700          * Note the rfc defines rd_maxcount as the size of the
3701          * READDIR4resok structure, which includes the verifier above
3702          * and the 8 bytes encoded at the end of this function:
3703          */
3704         if (maxcount < 16) {
3705                 nfserr = nfserr_toosmall;
3706                 goto err_no_verf;
3707         }
3708         maxcount = min_t(int, maxcount-16, bytes_left);
3709
3710         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3711         if (!readdir->rd_dircount)
3712                 readdir->rd_dircount = svc_max_payload(resp->rqstp);
3713
3714         readdir->xdr = xdr;
3715         readdir->rd_maxcount = maxcount;
3716         readdir->common.err = 0;
3717         readdir->cookie_offset = 0;
3718
3719         offset = readdir->rd_cookie;
3720         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3721                               &offset,
3722                               &readdir->common, nfsd4_encode_dirent);
3723         if (nfserr == nfs_ok &&
3724             readdir->common.err == nfserr_toosmall &&
3725             xdr->buf->len == starting_len + 8) {
3726                 /* nothing encoded; which limit did we hit?: */
3727                 if (maxcount - 16 < bytes_left)
3728                         /* It was the fault of rd_maxcount: */
3729                         nfserr = nfserr_toosmall;
3730                 else
3731                         /* We ran out of buffer space: */
3732                         nfserr = nfserr_resource;
3733         }
3734         if (nfserr)
3735                 goto err_no_verf;
3736
3737         if (readdir->cookie_offset) {
3738                 wire_offset = cpu_to_be64(offset);
3739                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3740                                                         &wire_offset, 8);
3741         }
3742
3743         p = xdr_reserve_space(xdr, 8);
3744         if (!p) {
3745                 WARN_ON_ONCE(1);
3746                 goto err_no_verf;
3747         }
3748         *p++ = 0;       /* no more entries */
3749         *p++ = htonl(readdir->common.err == nfserr_eof);
3750
3751         return 0;
3752 err_no_verf:
3753         xdr_truncate_encode(xdr, starting_len);
3754         return nfserr;
3755 }
3756
3757 static __be32
3758 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3759 {
3760         struct xdr_stream *xdr = &resp->xdr;
3761         __be32 *p;
3762
3763         p = xdr_reserve_space(xdr, 20);
3764         if (!p)
3765                 return nfserr_resource;
3766         p = encode_cinfo(p, &remove->rm_cinfo);
3767         return 0;
3768 }
3769
3770 static __be32
3771 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3772 {
3773         struct xdr_stream *xdr = &resp->xdr;
3774         __be32 *p;
3775
3776         p = xdr_reserve_space(xdr, 40);
3777         if (!p)
3778                 return nfserr_resource;
3779         p = encode_cinfo(p, &rename->rn_sinfo);
3780         p = encode_cinfo(p, &rename->rn_tinfo);
3781         return 0;
3782 }
3783
3784 static __be32
3785 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
3786 {
3787         u32 i, nflavs, supported;
3788         struct exp_flavor_info *flavs;
3789         struct exp_flavor_info def_flavs[2];
3790         __be32 *p, *flavorsp;
3791         static bool report = true;
3792
3793         if (exp->ex_nflavors) {
3794                 flavs = exp->ex_flavors;
3795                 nflavs = exp->ex_nflavors;
3796         } else { /* Handling of some defaults in absence of real secinfo: */
3797                 flavs = def_flavs;
3798                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3799                         nflavs = 2;
3800                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3801                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3802                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3803                         nflavs = 1;
3804                         flavs[0].pseudoflavor
3805                                         = svcauth_gss_flavor(exp->ex_client);
3806                 } else {
3807                         nflavs = 1;
3808                         flavs[0].pseudoflavor
3809                                         = exp->ex_client->flavour->flavour;
3810                 }
3811         }
3812
3813         supported = 0;
3814         p = xdr_reserve_space(xdr, 4);
3815         if (!p)
3816                 return nfserr_resource;
3817         flavorsp = p++;         /* to be backfilled later */
3818
3819         for (i = 0; i < nflavs; i++) {
3820                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3821                 struct rpcsec_gss_info info;
3822
3823                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3824                         supported++;
3825                         p = xdr_reserve_space(xdr, 4 + 4 +
3826                                               XDR_LEN(info.oid.len) + 4 + 4);
3827                         if (!p)
3828                                 return nfserr_resource;
3829                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3830                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3831                         *p++ = cpu_to_be32(info.qop);
3832                         *p++ = cpu_to_be32(info.service);
3833                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3834                         supported++;
3835                         p = xdr_reserve_space(xdr, 4);
3836                         if (!p)
3837                                 return nfserr_resource;
3838                         *p++ = cpu_to_be32(pf);
3839                 } else {
3840                         if (report)
3841                                 pr_warn("NFS: SECINFO: security flavor %u "
3842                                         "is not supported\n", pf);
3843                 }
3844         }
3845
3846         if (nflavs != supported)
3847                 report = false;
3848         *flavorsp = htonl(supported);
3849         return 0;
3850 }
3851
3852 static __be32
3853 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3854                      struct nfsd4_secinfo *secinfo)
3855 {
3856         struct xdr_stream *xdr = &resp->xdr;
3857
3858         return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
3859 }
3860
3861 static __be32
3862 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3863                      struct nfsd4_secinfo_no_name *secinfo)
3864 {
3865         struct xdr_stream *xdr = &resp->xdr;
3866
3867         return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
3868 }
3869
3870 /*
3871  * The SETATTR encode routine is special -- it always encodes a bitmap,
3872  * regardless of the error status.
3873  */
3874 static __be32
3875 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3876 {
3877         struct xdr_stream *xdr = &resp->xdr;
3878         __be32 *p;
3879
3880         p = xdr_reserve_space(xdr, 16);
3881         if (!p)
3882                 return nfserr_resource;
3883         if (nfserr) {
3884                 *p++ = cpu_to_be32(3);
3885                 *p++ = cpu_to_be32(0);
3886                 *p++ = cpu_to_be32(0);
3887                 *p++ = cpu_to_be32(0);
3888         }
3889         else {
3890                 *p++ = cpu_to_be32(3);
3891                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3892                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3893                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3894         }
3895         return nfserr;
3896 }
3897
3898 static __be32
3899 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3900 {
3901         struct xdr_stream *xdr = &resp->xdr;
3902         __be32 *p;
3903
3904         if (!nfserr) {
3905                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3906                 if (!p)
3907                         return nfserr_resource;
3908                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3909                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3910                                                 NFS4_VERIFIER_SIZE);
3911         }
3912         else if (nfserr == nfserr_clid_inuse) {
3913                 p = xdr_reserve_space(xdr, 8);
3914                 if (!p)
3915                         return nfserr_resource;
3916                 *p++ = cpu_to_be32(0);
3917                 *p++ = cpu_to_be32(0);
3918         }
3919         return nfserr;
3920 }
3921
3922 static __be32
3923 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3924 {
3925         struct xdr_stream *xdr = &resp->xdr;
3926         __be32 *p;
3927
3928         p = xdr_reserve_space(xdr, 16);
3929         if (!p)
3930                 return nfserr_resource;
3931         *p++ = cpu_to_be32(write->wr_bytes_written);
3932         *p++ = cpu_to_be32(write->wr_how_written);
3933         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3934                                                 NFS4_VERIFIER_SIZE);
3935         return 0;
3936 }
3937
3938 static __be32
3939 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3940                          struct nfsd4_exchange_id *exid)
3941 {
3942         struct xdr_stream *xdr = &resp->xdr;
3943         __be32 *p;
3944         char *major_id;
3945         char *server_scope;
3946         int major_id_sz;
3947         int server_scope_sz;
3948         uint64_t minor_id = 0;
3949
3950         major_id = utsname()->nodename;
3951         major_id_sz = strlen(major_id);
3952         server_scope = utsname()->nodename;
3953         server_scope_sz = strlen(server_scope);
3954
3955         p = xdr_reserve_space(xdr,
3956                 8 /* eir_clientid */ +
3957                 4 /* eir_sequenceid */ +
3958                 4 /* eir_flags */ +
3959                 4 /* spr_how */);
3960         if (!p)
3961                 return nfserr_resource;
3962
3963         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3964         *p++ = cpu_to_be32(exid->seqid);
3965         *p++ = cpu_to_be32(exid->flags);
3966
3967         *p++ = cpu_to_be32(exid->spa_how);
3968
3969         switch (exid->spa_how) {
3970         case SP4_NONE:
3971                 break;
3972         case SP4_MACH_CRED:
3973                 /* spo_must_enforce bitmap: */
3974                 nfserr = nfsd4_encode_bitmap(xdr,
3975                                         exid->spo_must_enforce[0],
3976                                         exid->spo_must_enforce[1],
3977                                         exid->spo_must_enforce[2]);
3978                 if (nfserr)
3979                         return nfserr;
3980                 /* spo_must_allow bitmap: */
3981                 nfserr = nfsd4_encode_bitmap(xdr,
3982                                         exid->spo_must_allow[0],
3983                                         exid->spo_must_allow[1],
3984                                         exid->spo_must_allow[2]);
3985                 if (nfserr)
3986                         return nfserr;
3987                 break;
3988         default:
3989                 WARN_ON_ONCE(1);
3990         }
3991
3992         p = xdr_reserve_space(xdr,
3993                 8 /* so_minor_id */ +
3994                 4 /* so_major_id.len */ +
3995                 (XDR_QUADLEN(major_id_sz) * 4) +
3996                 4 /* eir_server_scope.len */ +
3997                 (XDR_QUADLEN(server_scope_sz) * 4) +
3998                 4 /* eir_server_impl_id.count (0) */);
3999         if (!p)
4000                 return nfserr_resource;
4001
4002         /* The server_owner struct */
4003         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
4004         /* major id */
4005         p = xdr_encode_opaque(p, major_id, major_id_sz);
4006
4007         /* Server scope */
4008         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4009
4010         /* Implementation id */
4011         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
4012         return 0;
4013 }
4014
4015 static __be32
4016 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4017                             struct nfsd4_create_session *sess)
4018 {
4019         struct xdr_stream *xdr = &resp->xdr;
4020         __be32 *p;
4021
4022         p = xdr_reserve_space(xdr, 24);
4023         if (!p)
4024                 return nfserr_resource;
4025         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4026                                         NFS4_MAX_SESSIONID_LEN);
4027         *p++ = cpu_to_be32(sess->seqid);
4028         *p++ = cpu_to_be32(sess->flags);
4029
4030         p = xdr_reserve_space(xdr, 28);
4031         if (!p)
4032                 return nfserr_resource;
4033         *p++ = cpu_to_be32(0); /* headerpadsz */
4034         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4035         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4036         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4037         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4038         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4039         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4040
4041         if (sess->fore_channel.nr_rdma_attrs) {
4042                 p = xdr_reserve_space(xdr, 4);
4043                 if (!p)
4044                         return nfserr_resource;
4045                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4046         }
4047
4048         p = xdr_reserve_space(xdr, 28);
4049         if (!p)
4050                 return nfserr_resource;
4051         *p++ = cpu_to_be32(0); /* headerpadsz */
4052         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4053         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4054         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4055         *p++ = cpu_to_be32(sess->back_channel.maxops);
4056         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4057         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4058
4059         if (sess->back_channel.nr_rdma_attrs) {
4060                 p = xdr_reserve_space(xdr, 4);
4061                 if (!p)
4062                         return nfserr_resource;
4063                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4064         }
4065         return 0;
4066 }
4067
4068 static __be32
4069 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4070                       struct nfsd4_sequence *seq)
4071 {
4072         struct xdr_stream *xdr = &resp->xdr;
4073         __be32 *p;
4074
4075         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4076         if (!p)
4077                 return nfserr_resource;
4078         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4079                                         NFS4_MAX_SESSIONID_LEN);
4080         *p++ = cpu_to_be32(seq->seqid);
4081         *p++ = cpu_to_be32(seq->slotid);
4082         /* Note slotid's are numbered from zero: */
4083         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4084         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4085         *p++ = cpu_to_be32(seq->status_flags);
4086
4087         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4088         return 0;
4089 }
4090
4091 static __be32
4092 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4093                           struct nfsd4_test_stateid *test_stateid)
4094 {
4095         struct xdr_stream *xdr = &resp->xdr;
4096         struct nfsd4_test_stateid_id *stateid, *next;
4097         __be32 *p;
4098
4099         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4100         if (!p)
4101                 return nfserr_resource;
4102         *p++ = htonl(test_stateid->ts_num_ids);
4103
4104         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4105                 *p++ = stateid->ts_id_status;
4106         }
4107
4108         return 0;
4109 }
4110
4111 #ifdef CONFIG_NFSD_PNFS
4112 static __be32
4113 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4114                 struct nfsd4_getdeviceinfo *gdev)
4115 {
4116         struct xdr_stream *xdr = &resp->xdr;
4117         const struct nfsd4_layout_ops *ops;
4118         u32 starting_len = xdr->buf->len, needed_len;
4119         __be32 *p;
4120
4121         p = xdr_reserve_space(xdr, 4);
4122         if (!p)
4123                 return nfserr_resource;
4124
4125         *p++ = cpu_to_be32(gdev->gd_layout_type);
4126
4127         /* If maxcount is 0 then just update notifications */
4128         if (gdev->gd_maxcount != 0) {
4129                 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4130                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4131                 if (nfserr) {
4132                         /*
4133                          * We don't bother to burden the layout drivers with
4134                          * enforcing gd_maxcount, just tell the client to
4135                          * come back with a bigger buffer if it's not enough.
4136                          */
4137                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4138                                 goto toosmall;
4139                         return nfserr;
4140                 }
4141         }
4142
4143         if (gdev->gd_notify_types) {
4144                 p = xdr_reserve_space(xdr, 4 + 4);
4145                 if (!p)
4146                         return nfserr_resource;
4147                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4148                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4149         } else {
4150                 p = xdr_reserve_space(xdr, 4);
4151                 if (!p)
4152                         return nfserr_resource;
4153                 *p++ = 0;
4154         }
4155
4156         return 0;
4157 toosmall:
4158         dprintk("%s: maxcount too small\n", __func__);
4159         needed_len = xdr->buf->len + 4 /* notifications */;
4160         xdr_truncate_encode(xdr, starting_len);
4161         p = xdr_reserve_space(xdr, 4);
4162         if (!p)
4163                 return nfserr_resource;
4164         *p++ = cpu_to_be32(needed_len);
4165         return nfserr_toosmall;
4166 }
4167
4168 static __be32
4169 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4170                 struct nfsd4_layoutget *lgp)
4171 {
4172         struct xdr_stream *xdr = &resp->xdr;
4173         const struct nfsd4_layout_ops *ops;
4174         __be32 *p;
4175
4176         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4177         if (!p)
4178                 return nfserr_resource;
4179
4180         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4181         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4182         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4183                                     sizeof(stateid_opaque_t));
4184
4185         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4186         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4187         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4188         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4189         *p++ = cpu_to_be32(lgp->lg_layout_type);
4190
4191         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4192         return ops->encode_layoutget(xdr, lgp);
4193 }
4194
4195 static __be32
4196 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4197                           struct nfsd4_layoutcommit *lcp)
4198 {
4199         struct xdr_stream *xdr = &resp->xdr;
4200         __be32 *p;
4201
4202         p = xdr_reserve_space(xdr, 4);
4203         if (!p)
4204                 return nfserr_resource;
4205         *p++ = cpu_to_be32(lcp->lc_size_chg);
4206         if (lcp->lc_size_chg) {
4207                 p = xdr_reserve_space(xdr, 8);
4208                 if (!p)
4209                         return nfserr_resource;
4210                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4211         }
4212
4213         return 0;
4214 }
4215
4216 static __be32
4217 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4218                 struct nfsd4_layoutreturn *lrp)
4219 {
4220         struct xdr_stream *xdr = &resp->xdr;
4221         __be32 *p;
4222
4223         p = xdr_reserve_space(xdr, 4);
4224         if (!p)
4225                 return nfserr_resource;
4226         *p++ = cpu_to_be32(lrp->lrs_present);
4227         if (lrp->lrs_present)
4228                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4229         return 0;
4230 }
4231 #endif /* CONFIG_NFSD_PNFS */
4232
4233 static __be32
4234 nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
4235                 struct nfsd42_write_res *write, bool sync)
4236 {
4237         __be32 *p;
4238         p = xdr_reserve_space(&resp->xdr, 4);
4239         if (!p)
4240                 return nfserr_resource;
4241
4242         if (sync)
4243                 *p++ = cpu_to_be32(0);
4244         else {
4245                 __be32 nfserr;
4246                 *p++ = cpu_to_be32(1);
4247                 nfserr = nfsd4_encode_stateid(&resp->xdr, &write->cb_stateid);
4248                 if (nfserr)
4249                         return nfserr;
4250         }
4251         p = xdr_reserve_space(&resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
4252         if (!p)
4253                 return nfserr_resource;
4254
4255         p = xdr_encode_hyper(p, write->wr_bytes_written);
4256         *p++ = cpu_to_be32(write->wr_stable_how);
4257         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4258                                     NFS4_VERIFIER_SIZE);
4259         return nfs_ok;
4260 }
4261
4262 static __be32
4263 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4264                   struct nfsd4_copy *copy)
4265 {
4266         __be32 *p;
4267
4268         nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
4269                         copy->cp_synchronous);
4270         if (nfserr)
4271                 return nfserr;
4272
4273         p = xdr_reserve_space(&resp->xdr, 4 + 4);
4274         *p++ = xdr_one; /* cr_consecutive */
4275         *p++ = cpu_to_be32(copy->cp_synchronous);
4276         return 0;
4277 }
4278
4279 static __be32
4280 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
4281                             struct nfsd4_offload_status *os)
4282 {
4283         struct xdr_stream *xdr = &resp->xdr;
4284         __be32 *p;
4285
4286         p = xdr_reserve_space(xdr, 8 + 4);
4287         if (!p)
4288                 return nfserr_resource;
4289         p = xdr_encode_hyper(p, os->count);
4290         *p++ = cpu_to_be32(0);
4291
4292         return nfserr;
4293 }
4294
4295 static __be32
4296 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4297                   struct nfsd4_seek *seek)
4298 {
4299         __be32 *p;
4300
4301         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4302         *p++ = cpu_to_be32(seek->seek_eof);
4303         p = xdr_encode_hyper(p, seek->seek_pos);
4304
4305         return 0;
4306 }
4307
4308 static __be32
4309 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4310 {
4311         return nfserr;
4312 }
4313
4314 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4315
4316 /*
4317  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4318  * since we don't need to filter out obsolete ops as this is
4319  * done in the decoding phase.
4320  */
4321 static const nfsd4_enc nfsd4_enc_ops[] = {
4322         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4323         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4324         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4325         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4326         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4327         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4328         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4329         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4330         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4331         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4332         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4333         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4334         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4335         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4336         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4337         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4338         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4339         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4340         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4341         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4342         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4343         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4344         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4345         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4346         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4347         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4348         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4349         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4350         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4351         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4352         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4353         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4354         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4355         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4356         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4357         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4358         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4359
4360         /* NFSv4.1 operations */
4361         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4362         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4363         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4364         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4365         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4366         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4367         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4368 #ifdef CONFIG_NFSD_PNFS
4369         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4370         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4371         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4372         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4373         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4374 #else
4375         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4376         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4377         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4378         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4379         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4380 #endif
4381         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4382         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4383         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4384         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4385         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4386         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4387         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4388
4389         /* NFSv4.2 operations */
4390         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4391         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
4392         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4393         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4394         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4395         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4396         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4397         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4398         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_offload_status,
4399         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4400         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4401         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4402         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4403 };
4404
4405 /*
4406  * Calculate whether we still have space to encode repsize bytes.
4407  * There are two considerations:
4408  *     - For NFS versions >=4.1, the size of the reply must stay within
4409  *       session limits
4410  *     - For all NFS versions, we must stay within limited preallocated
4411  *       buffer space.
4412  *
4413  * This is called before the operation is processed, so can only provide
4414  * an upper estimate.  For some nonidempotent operations (such as
4415  * getattr), it's not necessarily a problem if that estimate is wrong,
4416  * as we can fail it after processing without significant side effects.
4417  */
4418 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4419 {
4420         struct xdr_buf *buf = &resp->rqstp->rq_res;
4421         struct nfsd4_slot *slot = resp->cstate.slot;
4422
4423         if (buf->len + respsize <= buf->buflen)
4424                 return nfs_ok;
4425         if (!nfsd4_has_session(&resp->cstate))
4426                 return nfserr_resource;
4427         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4428                 WARN_ON_ONCE(1);
4429                 return nfserr_rep_too_big_to_cache;
4430         }
4431         return nfserr_rep_too_big;
4432 }
4433
4434 void
4435 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4436 {
4437         struct xdr_stream *xdr = &resp->xdr;
4438         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4439         struct svc_rqst *rqstp = resp->rqstp;
4440         const struct nfsd4_operation *opdesc = op->opdesc;
4441         int post_err_offset;
4442         nfsd4_enc encoder;
4443         __be32 *p;
4444
4445         p = xdr_reserve_space(xdr, 8);
4446         if (!p) {
4447                 WARN_ON_ONCE(1);
4448                 return;
4449         }
4450         *p++ = cpu_to_be32(op->opnum);
4451         post_err_offset = xdr->buf->len;
4452
4453         if (op->opnum == OP_ILLEGAL)
4454                 goto status;
4455         if (op->status && opdesc &&
4456                         !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
4457                 goto status;
4458         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4459                !nfsd4_enc_ops[op->opnum]);
4460         encoder = nfsd4_enc_ops[op->opnum];
4461         op->status = encoder(resp, op->status, &op->u);
4462         if (opdesc && opdesc->op_release)
4463                 opdesc->op_release(&op->u);
4464         xdr_commit_encode(xdr);
4465
4466         /* nfsd4_check_resp_size guarantees enough room for error status */
4467         if (!op->status) {
4468                 int space_needed = 0;
4469                 if (!nfsd4_last_compound_op(rqstp))
4470                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4471                 op->status = nfsd4_check_resp_size(resp, space_needed);
4472         }
4473         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4474                 struct nfsd4_slot *slot = resp->cstate.slot;
4475
4476                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4477                         op->status = nfserr_rep_too_big_to_cache;
4478                 else
4479                         op->status = nfserr_rep_too_big;
4480         }
4481         if (op->status == nfserr_resource ||
4482             op->status == nfserr_rep_too_big ||
4483             op->status == nfserr_rep_too_big_to_cache) {
4484                 /*
4485                  * The operation may have already been encoded or
4486                  * partially encoded.  No op returns anything additional
4487                  * in the case of one of these three errors, so we can
4488                  * just truncate back to after the status.  But it's a
4489                  * bug if we had to do this on a non-idempotent op:
4490                  */
4491                 warn_on_nonidempotent_op(op);
4492                 xdr_truncate_encode(xdr, post_err_offset);
4493         }
4494         if (so) {
4495                 int len = xdr->buf->len - post_err_offset;
4496
4497                 so->so_replay.rp_status = op->status;
4498                 so->so_replay.rp_buflen = len;
4499                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4500                                                 so->so_replay.rp_buf, len);
4501         }
4502 status:
4503         /* Note that op->status is already in network byte order: */
4504         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4505 }
4506
4507 /*
4508  * Encode the reply stored in the stateowner reply cache
4509  *
4510  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4511  * previously sent already encoded operation.
4512  */
4513 void
4514 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4515 {
4516         __be32 *p;
4517         struct nfs4_replay *rp = op->replay;
4518
4519         BUG_ON(!rp);
4520
4521         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4522         if (!p) {
4523                 WARN_ON_ONCE(1);
4524                 return;
4525         }
4526         *p++ = cpu_to_be32(op->opnum);
4527         *p++ = rp->rp_status;  /* already xdr'ed */
4528
4529         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4530 }
4531
4532 int
4533 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4534 {
4535         return xdr_ressize_check(rqstp, p);
4536 }
4537
4538 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4539 {
4540         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4541
4542         if (args->ops != args->iops) {
4543                 kfree(args->ops);
4544                 args->ops = args->iops;
4545         }
4546         kfree(args->tmpp);
4547         args->tmpp = NULL;
4548         while (args->to_free) {
4549                 struct svcxdr_tmpbuf *tb = args->to_free;
4550                 args->to_free = tb->next;
4551                 kfree(tb);
4552         }
4553 }
4554
4555 int
4556 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4557 {
4558         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4559
4560         if (rqstp->rq_arg.head[0].iov_len % 4) {
4561                 /* client is nuts */
4562                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4563                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4564                 return 0;
4565         }
4566         args->p = p;
4567         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4568         args->pagelist = rqstp->rq_arg.pages;
4569         args->pagelen = rqstp->rq_arg.page_len;
4570         args->tail = false;
4571         args->tmpp = NULL;
4572         args->to_free = NULL;
4573         args->ops = args->iops;
4574         args->rqstp = rqstp;
4575
4576         return !nfsd4_decode_compound(args);
4577 }
4578
4579 int
4580 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4581 {
4582         /*
4583          * All that remains is to write the tag and operation count...
4584          */
4585         struct nfsd4_compoundres *resp = rqstp->rq_resp;
4586         struct xdr_buf *buf = resp->xdr.buf;
4587
4588         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4589                                  buf->tail[0].iov_len);
4590
4591         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4592
4593         p = resp->tagp;
4594         *p++ = htonl(resp->taglen);
4595         memcpy(p, resp->tag, resp->taglen);
4596         p += XDR_QUADLEN(resp->taglen);
4597         *p++ = htonl(resp->opcnt);
4598
4599         nfsd4_sequence_done(resp);
4600         return 1;
4601 }
4602
4603 /*
4604  * Local variables:
4605  *  c-basic-offset: 8
4606  * End:
4607  */