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_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1772 {
1773         DECODE_HEAD;
1774
1775         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1776         if (status)
1777                 return status;
1778
1779         READ_BUF(8 + 4);
1780         p = xdr_decode_hyper(p, &seek->seek_offset);
1781         seek->seek_whence = be32_to_cpup(p);
1782
1783         DECODE_TAIL;
1784 }
1785
1786 static __be32
1787 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1788 {
1789         return nfs_ok;
1790 }
1791
1792 static __be32
1793 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1794 {
1795         return nfserr_notsupp;
1796 }
1797
1798 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1799
1800 static const nfsd4_dec nfsd4_dec_ops[] = {
1801         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1802         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1803         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1804         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1805         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1806         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1807         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1808         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1809         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1810         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1811         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1812         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1813         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1814         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1815         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1816         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1817         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1818         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1819         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1820         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1821         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1822         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1823         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1824         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1825         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1826         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1827         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1828         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1829         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1830         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1831         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1832         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1833         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1834         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1835         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1836         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1837         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1838
1839         /* new operations for NFSv4.1 */
1840         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1841         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1842         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1843         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1844         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1845         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1846         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1847 #ifdef CONFIG_NFSD_PNFS
1848         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1849         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1850         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1851         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1852         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1853 #else
1854         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1855         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1856         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1857         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1858         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1859 #endif
1860         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1861         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1862         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1863         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1864         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1865         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1866         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1867
1868         /* new operations for NFSv4.2 */
1869         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1870         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1871         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1872         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1873         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1874         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1875         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1876         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1877         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1878         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1879         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1880         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1881         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1882 };
1883
1884 static inline bool
1885 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1886 {
1887         if (op->opnum < FIRST_NFS4_OP)
1888                 return false;
1889         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1890                 return false;
1891         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1892                 return false;
1893         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1894                 return false;
1895         return true;
1896 }
1897
1898 static __be32
1899 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1900 {
1901         DECODE_HEAD;
1902         struct nfsd4_op *op;
1903         bool cachethis = false;
1904         int auth_slack= argp->rqstp->rq_auth_slack;
1905         int max_reply = auth_slack + 8; /* opcnt, status */
1906         int readcount = 0;
1907         int readbytes = 0;
1908         int i;
1909
1910         READ_BUF(4);
1911         argp->taglen = be32_to_cpup(p++);
1912         READ_BUF(argp->taglen);
1913         SAVEMEM(argp->tag, argp->taglen);
1914         READ_BUF(8);
1915         argp->minorversion = be32_to_cpup(p++);
1916         argp->opcnt = be32_to_cpup(p++);
1917         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1918
1919         if (argp->taglen > NFSD4_MAX_TAGLEN)
1920                 goto xdr_error;
1921         /*
1922          * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
1923          * here, so we return success at the xdr level so that
1924          * nfsd4_proc can handle this is an NFS-level error.
1925          */
1926         if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1927                 return 0;
1928
1929         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1930                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1931                 if (!argp->ops) {
1932                         argp->ops = argp->iops;
1933                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1934                         goto xdr_error;
1935                 }
1936         }
1937
1938         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1939                 argp->opcnt = 0;
1940
1941         for (i = 0; i < argp->opcnt; i++) {
1942                 op = &argp->ops[i];
1943                 op->replay = NULL;
1944
1945                 READ_BUF(4);
1946                 op->opnum = be32_to_cpup(p++);
1947
1948                 if (nfsd4_opnum_in_range(argp, op))
1949                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1950                 else {
1951                         op->opnum = OP_ILLEGAL;
1952                         op->status = nfserr_op_illegal;
1953                 }
1954                 op->opdesc = OPDESC(op);
1955                 /*
1956                  * We'll try to cache the result in the DRC if any one
1957                  * op in the compound wants to be cached:
1958                  */
1959                 cachethis |= nfsd4_cache_this_op(op);
1960
1961                 if (op->opnum == OP_READ) {
1962                         readcount++;
1963                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1964                 } else
1965                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1966                 /*
1967                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
1968                  * (Special case because it will just skip encoding this
1969                  * if it runs out of xdr buffer space, and it is the only
1970                  * operation that behaves this way.)
1971                  */
1972                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1973                         max_reply += NFS4_OPAQUE_LIMIT;
1974
1975                 if (op->status) {
1976                         argp->opcnt = i+1;
1977                         break;
1978                 }
1979         }
1980         /* Sessions make the DRC unnecessary: */
1981         if (argp->minorversion)
1982                 cachethis = false;
1983         svc_reserve(argp->rqstp, max_reply + readbytes);
1984         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1985
1986         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1987                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1988
1989         DECODE_TAIL;
1990 }
1991
1992 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
1993                              struct svc_export *exp)
1994 {
1995         if (exp->ex_flags & NFSEXP_V4ROOT) {
1996                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
1997                 *p++ = 0;
1998         } else if (IS_I_VERSION(inode)) {
1999                 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2000         } else {
2001                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2002                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2003         }
2004         return p;
2005 }
2006
2007 /*
2008  * ctime (in NFSv4, time_metadata) is not writeable, and the client
2009  * doesn't really care what resolution could theoretically be stored by
2010  * the filesystem.
2011  *
2012  * The client cares how close together changes can be while still
2013  * guaranteeing ctime changes.  For most filesystems (which have
2014  * timestamps with nanosecond fields) that is limited by the resolution
2015  * of the time returned from current_time() (which I'm assuming to be
2016  * 1/HZ).
2017  */
2018 static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2019 {
2020         struct timespec ts;
2021         u32 ns;
2022
2023         ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2024         ts = ns_to_timespec(ns);
2025
2026         p = xdr_encode_hyper(p, ts.tv_sec);
2027         *p++ = cpu_to_be32(ts.tv_nsec);
2028
2029         return p;
2030 }
2031
2032 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2033 {
2034         *p++ = cpu_to_be32(c->atomic);
2035         if (c->change_supported) {
2036                 p = xdr_encode_hyper(p, c->before_change);
2037                 p = xdr_encode_hyper(p, c->after_change);
2038         } else {
2039                 *p++ = cpu_to_be32(c->before_ctime_sec);
2040                 *p++ = cpu_to_be32(c->before_ctime_nsec);
2041                 *p++ = cpu_to_be32(c->after_ctime_sec);
2042                 *p++ = cpu_to_be32(c->after_ctime_nsec);
2043         }
2044         return p;
2045 }
2046
2047 /* Encode as an array of strings the string given with components
2048  * separated @sep, escaped with esc_enter and esc_exit.
2049  */
2050 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2051                                           char *components, char esc_enter,
2052                                           char esc_exit)
2053 {
2054         __be32 *p;
2055         __be32 pathlen;
2056         int pathlen_offset;
2057         int strlen, count=0;
2058         char *str, *end, *next;
2059
2060         dprintk("nfsd4_encode_components(%s)\n", components);
2061
2062         pathlen_offset = xdr->buf->len;
2063         p = xdr_reserve_space(xdr, 4);
2064         if (!p)
2065                 return nfserr_resource;
2066         p++; /* We will fill this in with @count later */
2067
2068         end = str = components;
2069         while (*end) {
2070                 bool found_esc = false;
2071
2072                 /* try to parse as esc_start, ..., esc_end, sep */
2073                 if (*str == esc_enter) {
2074                         for (; *end && (*end != esc_exit); end++)
2075                                 /* find esc_exit or end of string */;
2076                         next = end + 1;
2077                         if (*end && (!*next || *next == sep)) {
2078                                 str++;
2079                                 found_esc = true;
2080                         }
2081                 }
2082
2083                 if (!found_esc)
2084                         for (; *end && (*end != sep); end++)
2085                                 /* find sep or end of string */;
2086
2087                 strlen = end - str;
2088                 if (strlen) {
2089                         p = xdr_reserve_space(xdr, strlen + 4);
2090                         if (!p)
2091                                 return nfserr_resource;
2092                         p = xdr_encode_opaque(p, str, strlen);
2093                         count++;
2094                 }
2095                 else
2096                         end++;
2097                 if (found_esc)
2098                         end = next;
2099
2100                 str = end;
2101         }
2102         pathlen = htonl(count);
2103         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2104         return 0;
2105 }
2106
2107 /* Encode as an array of strings the string given with components
2108  * separated @sep.
2109  */
2110 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2111                                       char *components)
2112 {
2113         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2114 }
2115
2116 /*
2117  * encode a location element of a fs_locations structure
2118  */
2119 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2120                                         struct nfsd4_fs_location *location)
2121 {
2122         __be32 status;
2123
2124         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2125                                                 '[', ']');
2126         if (status)
2127                 return status;
2128         status = nfsd4_encode_components(xdr, '/', location->path);
2129         if (status)
2130                 return status;
2131         return 0;
2132 }
2133
2134 /*
2135  * Encode a path in RFC3530 'pathname4' format
2136  */
2137 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2138                                 const struct path *root,
2139                                 const struct path *path)
2140 {
2141         struct path cur = *path;
2142         __be32 *p;
2143         struct dentry **components = NULL;
2144         unsigned int ncomponents = 0;
2145         __be32 err = nfserr_jukebox;
2146
2147         dprintk("nfsd4_encode_components(");
2148
2149         path_get(&cur);
2150         /* First walk the path up to the nfsd root, and store the
2151          * dentries/path components in an array.
2152          */
2153         for (;;) {
2154                 if (path_equal(&cur, root))
2155                         break;
2156                 if (cur.dentry == cur.mnt->mnt_root) {
2157                         if (follow_up(&cur))
2158                                 continue;
2159                         goto out_free;
2160                 }
2161                 if ((ncomponents & 15) == 0) {
2162                         struct dentry **new;
2163                         new = krealloc(components,
2164                                         sizeof(*new) * (ncomponents + 16),
2165                                         GFP_KERNEL);
2166                         if (!new)
2167                                 goto out_free;
2168                         components = new;
2169                 }
2170                 components[ncomponents++] = cur.dentry;
2171                 cur.dentry = dget_parent(cur.dentry);
2172         }
2173         err = nfserr_resource;
2174         p = xdr_reserve_space(xdr, 4);
2175         if (!p)
2176                 goto out_free;
2177         *p++ = cpu_to_be32(ncomponents);
2178
2179         while (ncomponents) {
2180                 struct dentry *dentry = components[ncomponents - 1];
2181                 unsigned int len;
2182
2183                 spin_lock(&dentry->d_lock);
2184                 len = dentry->d_name.len;
2185                 p = xdr_reserve_space(xdr, len + 4);
2186                 if (!p) {
2187                         spin_unlock(&dentry->d_lock);
2188                         goto out_free;
2189                 }
2190                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2191                 dprintk("/%pd", dentry);
2192                 spin_unlock(&dentry->d_lock);
2193                 dput(dentry);
2194                 ncomponents--;
2195         }
2196
2197         err = 0;
2198 out_free:
2199         dprintk(")\n");
2200         while (ncomponents)
2201                 dput(components[--ncomponents]);
2202         kfree(components);
2203         path_put(&cur);
2204         return err;
2205 }
2206
2207 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2208                         struct svc_rqst *rqstp, const struct path *path)
2209 {
2210         struct svc_export *exp_ps;
2211         __be32 res;
2212
2213         exp_ps = rqst_find_fsidzero_export(rqstp);
2214         if (IS_ERR(exp_ps))
2215                 return nfserrno(PTR_ERR(exp_ps));
2216         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2217         exp_put(exp_ps);
2218         return res;
2219 }
2220
2221 /*
2222  *  encode a fs_locations structure
2223  */
2224 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2225                         struct svc_rqst *rqstp, struct svc_export *exp)
2226 {
2227         __be32 status;
2228         int i;
2229         __be32 *p;
2230         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2231
2232         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2233         if (status)
2234                 return status;
2235         p = xdr_reserve_space(xdr, 4);
2236         if (!p)
2237                 return nfserr_resource;
2238         *p++ = cpu_to_be32(fslocs->locations_count);
2239         for (i=0; i<fslocs->locations_count; i++) {
2240                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2241                 if (status)
2242                         return status;
2243         }
2244         return 0;
2245 }
2246
2247 static u32 nfs4_file_type(umode_t mode)
2248 {
2249         switch (mode & S_IFMT) {
2250         case S_IFIFO:   return NF4FIFO;
2251         case S_IFCHR:   return NF4CHR;
2252         case S_IFDIR:   return NF4DIR;
2253         case S_IFBLK:   return NF4BLK;
2254         case S_IFLNK:   return NF4LNK;
2255         case S_IFREG:   return NF4REG;
2256         case S_IFSOCK:  return NF4SOCK;
2257         default:        return NF4BAD;
2258         };
2259 }
2260
2261 static inline __be32
2262 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2263                      struct nfs4_ace *ace)
2264 {
2265         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2266                 return nfs4_acl_write_who(xdr, ace->whotype);
2267         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2268                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2269         else
2270                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2271 }
2272
2273 static inline __be32
2274 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2275 {
2276         __be32          *p;
2277         unsigned long   i = hweight_long(layout_types);
2278
2279         p = xdr_reserve_space(xdr, 4 + 4 * i);
2280         if (!p)
2281                 return nfserr_resource;
2282
2283         *p++ = cpu_to_be32(i);
2284
2285         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2286                 if (layout_types & (1 << i))
2287                         *p++ = cpu_to_be32(i);
2288
2289         return 0;
2290 }
2291
2292 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2293                               FATTR4_WORD0_RDATTR_ERROR)
2294 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2295 #define WORD2_ABSENT_FS_ATTRS 0
2296
2297 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2298 static inline __be32
2299 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2300                             void *context, int len)
2301 {
2302         __be32 *p;
2303
2304         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2305         if (!p)
2306                 return nfserr_resource;
2307
2308         /*
2309          * For now we use a 0 here to indicate the null translation; in
2310          * the future we may place a call to translation code here.
2311          */
2312         *p++ = cpu_to_be32(0); /* lfs */
2313         *p++ = cpu_to_be32(0); /* pi */
2314         p = xdr_encode_opaque(p, context, len);
2315         return 0;
2316 }
2317 #else
2318 static inline __be32
2319 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2320                             void *context, int len)
2321 { return 0; }
2322 #endif
2323
2324 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2325 {
2326         /* As per referral draft:  */
2327         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2328             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2329                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2330                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2331                         *rdattr_err = NFSERR_MOVED;
2332                 else
2333                         return nfserr_moved;
2334         }
2335         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2336         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2337         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2338         return 0;
2339 }
2340
2341
2342 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2343 {
2344         struct path path = exp->ex_path;
2345         int err;
2346
2347         path_get(&path);
2348         while (follow_up(&path)) {
2349                 if (path.dentry != path.mnt->mnt_root)
2350                         break;
2351         }
2352         err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2353         path_put(&path);
2354         return err;
2355 }
2356
2357 static __be32
2358 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2359 {
2360         __be32 *p;
2361
2362         if (bmval2) {
2363                 p = xdr_reserve_space(xdr, 16);
2364                 if (!p)
2365                         goto out_resource;
2366                 *p++ = cpu_to_be32(3);
2367                 *p++ = cpu_to_be32(bmval0);
2368                 *p++ = cpu_to_be32(bmval1);
2369                 *p++ = cpu_to_be32(bmval2);
2370         } else if (bmval1) {
2371                 p = xdr_reserve_space(xdr, 12);
2372                 if (!p)
2373                         goto out_resource;
2374                 *p++ = cpu_to_be32(2);
2375                 *p++ = cpu_to_be32(bmval0);
2376                 *p++ = cpu_to_be32(bmval1);
2377         } else {
2378                 p = xdr_reserve_space(xdr, 8);
2379                 if (!p)
2380                         goto out_resource;
2381                 *p++ = cpu_to_be32(1);
2382                 *p++ = cpu_to_be32(bmval0);
2383         }
2384
2385         return 0;
2386 out_resource:
2387         return nfserr_resource;
2388 }
2389
2390 /*
2391  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2392  * ourselves.
2393  */
2394 static __be32
2395 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2396                 struct svc_export *exp,
2397                 struct dentry *dentry, u32 *bmval,
2398                 struct svc_rqst *rqstp, int ignore_crossmnt)
2399 {
2400         u32 bmval0 = bmval[0];
2401         u32 bmval1 = bmval[1];
2402         u32 bmval2 = bmval[2];
2403         struct kstat stat;
2404         struct svc_fh *tempfh = NULL;
2405         struct kstatfs statfs;
2406         __be32 *p;
2407         int starting_len = xdr->buf->len;
2408         int attrlen_offset;
2409         __be32 attrlen;
2410         u32 dummy;
2411         u64 dummy64;
2412         u32 rdattr_err = 0;
2413         __be32 status;
2414         int err;
2415         struct nfs4_acl *acl = NULL;
2416 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2417         void *context = NULL;
2418         int contextlen;
2419 #endif
2420         bool contextsupport = false;
2421         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2422         u32 minorversion = resp->cstate.minorversion;
2423         struct path path = {
2424                 .mnt    = exp->ex_path.mnt,
2425                 .dentry = dentry,
2426         };
2427         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2428
2429         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2430         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2431
2432         if (exp->ex_fslocs.migrated) {
2433                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2434                 if (status)
2435                         goto out;
2436         }
2437
2438         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2439         if (err)
2440                 goto out_nfserr;
2441         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2442                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2443             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2444                        FATTR4_WORD1_SPACE_TOTAL))) {
2445                 err = vfs_statfs(&path, &statfs);
2446                 if (err)
2447                         goto out_nfserr;
2448         }
2449         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2450                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2451                 status = nfserr_jukebox;
2452                 if (!tempfh)
2453                         goto out;
2454                 fh_init(tempfh, NFS4_FHSIZE);
2455                 status = fh_compose(tempfh, exp, dentry, NULL);
2456                 if (status)
2457                         goto out;
2458                 fhp = tempfh;
2459         }
2460         if (bmval0 & FATTR4_WORD0_ACL) {
2461                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2462                 if (err == -EOPNOTSUPP)
2463                         bmval0 &= ~FATTR4_WORD0_ACL;
2464                 else if (err == -EINVAL) {
2465                         status = nfserr_attrnotsupp;
2466                         goto out;
2467                 } else if (err != 0)
2468                         goto out_nfserr;
2469         }
2470
2471 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2472         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2473              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2474                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2475                         err = security_inode_getsecctx(d_inode(dentry),
2476                                                 &context, &contextlen);
2477                 else
2478                         err = -EOPNOTSUPP;
2479                 contextsupport = (err == 0);
2480                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2481                         if (err == -EOPNOTSUPP)
2482                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2483                         else if (err)
2484                                 goto out_nfserr;
2485                 }
2486         }
2487 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2488
2489         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2490         if (status)
2491                 goto out;
2492
2493         attrlen_offset = xdr->buf->len;
2494         p = xdr_reserve_space(xdr, 4);
2495         if (!p)
2496                 goto out_resource;
2497         p++;                /* to be backfilled later */
2498
2499         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2500                 u32 supp[3];
2501
2502                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2503
2504                 if (!IS_POSIXACL(dentry->d_inode))
2505                         supp[0] &= ~FATTR4_WORD0_ACL;
2506                 if (!contextsupport)
2507                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2508                 if (!supp[2]) {
2509                         p = xdr_reserve_space(xdr, 12);
2510                         if (!p)
2511                                 goto out_resource;
2512                         *p++ = cpu_to_be32(2);
2513                         *p++ = cpu_to_be32(supp[0]);
2514                         *p++ = cpu_to_be32(supp[1]);
2515                 } else {
2516                         p = xdr_reserve_space(xdr, 16);
2517                         if (!p)
2518                                 goto out_resource;
2519                         *p++ = cpu_to_be32(3);
2520                         *p++ = cpu_to_be32(supp[0]);
2521                         *p++ = cpu_to_be32(supp[1]);
2522                         *p++ = cpu_to_be32(supp[2]);
2523                 }
2524         }
2525         if (bmval0 & FATTR4_WORD0_TYPE) {
2526                 p = xdr_reserve_space(xdr, 4);
2527                 if (!p)
2528                         goto out_resource;
2529                 dummy = nfs4_file_type(stat.mode);
2530                 if (dummy == NF4BAD) {
2531                         status = nfserr_serverfault;
2532                         goto out;
2533                 }
2534                 *p++ = cpu_to_be32(dummy);
2535         }
2536         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2537                 p = xdr_reserve_space(xdr, 4);
2538                 if (!p)
2539                         goto out_resource;
2540                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2541                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2542                 else
2543                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2544                                                 NFS4_FH_VOL_RENAME);
2545         }
2546         if (bmval0 & FATTR4_WORD0_CHANGE) {
2547                 p = xdr_reserve_space(xdr, 8);
2548                 if (!p)
2549                         goto out_resource;
2550                 p = encode_change(p, &stat, d_inode(dentry), exp);
2551         }
2552         if (bmval0 & FATTR4_WORD0_SIZE) {
2553                 p = xdr_reserve_space(xdr, 8);
2554                 if (!p)
2555                         goto out_resource;
2556                 p = xdr_encode_hyper(p, stat.size);
2557         }
2558         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2559                 p = xdr_reserve_space(xdr, 4);
2560                 if (!p)
2561                         goto out_resource;
2562                 *p++ = cpu_to_be32(1);
2563         }
2564         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2565                 p = xdr_reserve_space(xdr, 4);
2566                 if (!p)
2567                         goto out_resource;
2568                 *p++ = cpu_to_be32(1);
2569         }
2570         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2571                 p = xdr_reserve_space(xdr, 4);
2572                 if (!p)
2573                         goto out_resource;
2574                 *p++ = cpu_to_be32(0);
2575         }
2576         if (bmval0 & FATTR4_WORD0_FSID) {
2577                 p = xdr_reserve_space(xdr, 16);
2578                 if (!p)
2579                         goto out_resource;
2580                 if (exp->ex_fslocs.migrated) {
2581                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2582                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2583                 } else switch(fsid_source(fhp)) {
2584                 case FSIDSOURCE_FSID:
2585                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2586                         p = xdr_encode_hyper(p, (u64)0);
2587                         break;
2588                 case FSIDSOURCE_DEV:
2589                         *p++ = cpu_to_be32(0);
2590                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2591                         *p++ = cpu_to_be32(0);
2592                         *p++ = cpu_to_be32(MINOR(stat.dev));
2593                         break;
2594                 case FSIDSOURCE_UUID:
2595                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2596                                                                 EX_UUID_LEN);
2597                         break;
2598                 }
2599         }
2600         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2601                 p = xdr_reserve_space(xdr, 4);
2602                 if (!p)
2603                         goto out_resource;
2604                 *p++ = cpu_to_be32(0);
2605         }
2606         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2607                 p = xdr_reserve_space(xdr, 4);
2608                 if (!p)
2609                         goto out_resource;
2610                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2611         }
2612         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2613                 p = xdr_reserve_space(xdr, 4);
2614                 if (!p)
2615                         goto out_resource;
2616                 *p++ = cpu_to_be32(rdattr_err);
2617         }
2618         if (bmval0 & FATTR4_WORD0_ACL) {
2619                 struct nfs4_ace *ace;
2620
2621                 if (acl == NULL) {
2622                         p = xdr_reserve_space(xdr, 4);
2623                         if (!p)
2624                                 goto out_resource;
2625
2626                         *p++ = cpu_to_be32(0);
2627                         goto out_acl;
2628                 }
2629                 p = xdr_reserve_space(xdr, 4);
2630                 if (!p)
2631                         goto out_resource;
2632                 *p++ = cpu_to_be32(acl->naces);
2633
2634                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2635                         p = xdr_reserve_space(xdr, 4*3);
2636                         if (!p)
2637                                 goto out_resource;
2638                         *p++ = cpu_to_be32(ace->type);
2639                         *p++ = cpu_to_be32(ace->flag);
2640                         *p++ = cpu_to_be32(ace->access_mask &
2641                                                         NFS4_ACE_MASK_ALL);
2642                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2643                         if (status)
2644                                 goto out;
2645                 }
2646         }
2647 out_acl:
2648         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2649                 p = xdr_reserve_space(xdr, 4);
2650                 if (!p)
2651                         goto out_resource;
2652                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2653                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2654         }
2655         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2656                 p = xdr_reserve_space(xdr, 4);
2657                 if (!p)
2658                         goto out_resource;
2659                 *p++ = cpu_to_be32(1);
2660         }
2661         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2662                 p = xdr_reserve_space(xdr, 4);
2663                 if (!p)
2664                         goto out_resource;
2665                 *p++ = cpu_to_be32(0);
2666         }
2667         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2668                 p = xdr_reserve_space(xdr, 4);
2669                 if (!p)
2670                         goto out_resource;
2671                 *p++ = cpu_to_be32(1);
2672         }
2673         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2674                 p = xdr_reserve_space(xdr, 4);
2675                 if (!p)
2676                         goto out_resource;
2677                 *p++ = cpu_to_be32(1);
2678         }
2679         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2680                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2681                 if (!p)
2682                         goto out_resource;
2683                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2684                                         fhp->fh_handle.fh_size);
2685         }
2686         if (bmval0 & FATTR4_WORD0_FILEID) {
2687                 p = xdr_reserve_space(xdr, 8);
2688                 if (!p)
2689                         goto out_resource;
2690                 p = xdr_encode_hyper(p, stat.ino);
2691         }
2692         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2693                 p = xdr_reserve_space(xdr, 8);
2694                 if (!p)
2695                         goto out_resource;
2696                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2697         }
2698         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2699                 p = xdr_reserve_space(xdr, 8);
2700                 if (!p)
2701                         goto out_resource;
2702                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2703         }
2704         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2705                 p = xdr_reserve_space(xdr, 8);
2706                 if (!p)
2707                         goto out_resource;
2708                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2709         }
2710         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2711                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2712                 if (status)
2713                         goto out;
2714         }
2715         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2716                 p = xdr_reserve_space(xdr, 4);
2717                 if (!p)
2718                         goto out_resource;
2719                 *p++ = cpu_to_be32(1);
2720         }
2721         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2722                 p = xdr_reserve_space(xdr, 8);
2723                 if (!p)
2724                         goto out_resource;
2725                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2726         }
2727         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2728                 p = xdr_reserve_space(xdr, 4);
2729                 if (!p)
2730                         goto out_resource;
2731                 *p++ = cpu_to_be32(255);
2732         }
2733         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2734                 p = xdr_reserve_space(xdr, 4);
2735                 if (!p)
2736                         goto out_resource;
2737                 *p++ = cpu_to_be32(statfs.f_namelen);
2738         }
2739         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2740                 p = xdr_reserve_space(xdr, 8);
2741                 if (!p)
2742                         goto out_resource;
2743                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2744         }
2745         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2746                 p = xdr_reserve_space(xdr, 8);
2747                 if (!p)
2748                         goto out_resource;
2749                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2750         }
2751         if (bmval1 & FATTR4_WORD1_MODE) {
2752                 p = xdr_reserve_space(xdr, 4);
2753                 if (!p)
2754                         goto out_resource;
2755                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2756         }
2757         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2758                 p = xdr_reserve_space(xdr, 4);
2759                 if (!p)
2760                         goto out_resource;
2761                 *p++ = cpu_to_be32(1);
2762         }
2763         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2764                 p = xdr_reserve_space(xdr, 4);
2765                 if (!p)
2766                         goto out_resource;
2767                 *p++ = cpu_to_be32(stat.nlink);
2768         }
2769         if (bmval1 & FATTR4_WORD1_OWNER) {
2770                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2771                 if (status)
2772                         goto out;
2773         }
2774         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2775                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2776                 if (status)
2777                         goto out;
2778         }
2779         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2780                 p = xdr_reserve_space(xdr, 8);
2781                 if (!p)
2782                         goto out_resource;
2783                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2784                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2785         }
2786         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2787                 p = xdr_reserve_space(xdr, 8);
2788                 if (!p)
2789                         goto out_resource;
2790                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2791                 p = xdr_encode_hyper(p, dummy64);
2792         }
2793         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2794                 p = xdr_reserve_space(xdr, 8);
2795                 if (!p)
2796                         goto out_resource;
2797                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2798                 p = xdr_encode_hyper(p, dummy64);
2799         }
2800         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2801                 p = xdr_reserve_space(xdr, 8);
2802                 if (!p)
2803                         goto out_resource;
2804                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2805                 p = xdr_encode_hyper(p, dummy64);
2806         }
2807         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2808                 p = xdr_reserve_space(xdr, 8);
2809                 if (!p)
2810                         goto out_resource;
2811                 dummy64 = (u64)stat.blocks << 9;
2812                 p = xdr_encode_hyper(p, dummy64);
2813         }
2814         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2815                 p = xdr_reserve_space(xdr, 12);
2816                 if (!p)
2817                         goto out_resource;
2818                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2819                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2820         }
2821         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2822                 p = xdr_reserve_space(xdr, 12);
2823                 if (!p)
2824                         goto out_resource;
2825                 p = encode_time_delta(p, d_inode(dentry));
2826         }
2827         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2828                 p = xdr_reserve_space(xdr, 12);
2829                 if (!p)
2830                         goto out_resource;
2831                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2832                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2833         }
2834         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2835                 p = xdr_reserve_space(xdr, 12);
2836                 if (!p)
2837                         goto out_resource;
2838                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2839                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2840         }
2841         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2842                 struct kstat parent_stat;
2843                 u64 ino = stat.ino;
2844
2845                 p = xdr_reserve_space(xdr, 8);
2846                 if (!p)
2847                         goto out_resource;
2848                 /*
2849                  * Get parent's attributes if not ignoring crossmount
2850                  * and this is the root of a cross-mounted filesystem.
2851                  */
2852                 if (ignore_crossmnt == 0 &&
2853                     dentry == exp->ex_path.mnt->mnt_root) {
2854                         err = get_parent_attributes(exp, &parent_stat);
2855                         if (err)
2856                                 goto out_nfserr;
2857                         ino = parent_stat.ino;
2858                 }
2859                 p = xdr_encode_hyper(p, ino);
2860         }
2861 #ifdef CONFIG_NFSD_PNFS
2862         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2863                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2864                 if (status)
2865                         goto out;
2866         }
2867
2868         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2869                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2870                 if (status)
2871                         goto out;
2872         }
2873
2874         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2875                 p = xdr_reserve_space(xdr, 4);
2876                 if (!p)
2877                         goto out_resource;
2878                 *p++ = cpu_to_be32(stat.blksize);
2879         }
2880 #endif /* CONFIG_NFSD_PNFS */
2881         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2882                 u32 supp[3];
2883
2884                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2885                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2886                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2887                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2888
2889                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2890                 if (status)
2891                         goto out;
2892         }
2893
2894         if (bmval2 & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
2895                 p = xdr_reserve_space(xdr, 4);
2896                 if (!p)
2897                         goto out_resource;
2898                 if (IS_I_VERSION(d_inode(dentry)))
2899                         *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR);
2900                 else
2901                         *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_TIME_METADATA);
2902         }
2903
2904 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2905         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2906                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2907                                                                 contextlen);
2908                 if (status)
2909                         goto out;
2910         }
2911 #endif
2912
2913         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2914         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2915         status = nfs_ok;
2916
2917 out:
2918 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2919         if (context)
2920                 security_release_secctx(context, contextlen);
2921 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2922         kfree(acl);
2923         if (tempfh) {
2924                 fh_put(tempfh);
2925                 kfree(tempfh);
2926         }
2927         if (status)
2928                 xdr_truncate_encode(xdr, starting_len);
2929         return status;
2930 out_nfserr:
2931         status = nfserrno(err);
2932         goto out;
2933 out_resource:
2934         status = nfserr_resource;
2935         goto out;
2936 }
2937
2938 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2939                                 struct xdr_buf *buf, __be32 *p, int bytes)
2940 {
2941         xdr->scratch.iov_len = 0;
2942         memset(buf, 0, sizeof(struct xdr_buf));
2943         buf->head[0].iov_base = p;
2944         buf->head[0].iov_len = 0;
2945         buf->len = 0;
2946         xdr->buf = buf;
2947         xdr->iov = buf->head;
2948         xdr->p = p;
2949         xdr->end = (void *)p + bytes;
2950         buf->buflen = bytes;
2951 }
2952
2953 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2954                         struct svc_fh *fhp, struct svc_export *exp,
2955                         struct dentry *dentry, u32 *bmval,
2956                         struct svc_rqst *rqstp, int ignore_crossmnt)
2957 {
2958         struct xdr_buf dummy;
2959         struct xdr_stream xdr;
2960         __be32 ret;
2961
2962         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2963         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2964                                                         ignore_crossmnt);
2965         *p = xdr.p;
2966         return ret;
2967 }
2968
2969 static inline int attributes_need_mount(u32 *bmval)
2970 {
2971         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2972                 return 1;
2973         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2974                 return 1;
2975         return 0;
2976 }
2977
2978 static __be32
2979 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2980                         const char *name, int namlen)
2981 {
2982         struct svc_export *exp = cd->rd_fhp->fh_export;
2983         struct dentry *dentry;
2984         __be32 nfserr;
2985         int ignore_crossmnt = 0;
2986
2987         dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2988         if (IS_ERR(dentry))
2989                 return nfserrno(PTR_ERR(dentry));
2990
2991         exp_get(exp);
2992         /*
2993          * In the case of a mountpoint, the client may be asking for
2994          * attributes that are only properties of the underlying filesystem
2995          * as opposed to the cross-mounted file system. In such a case,
2996          * we will not follow the cross mount and will fill the attribtutes
2997          * directly from the mountpoint dentry.
2998          */
2999         if (nfsd_mountpoint(dentry, exp)) {
3000                 int err;
3001
3002                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3003                                 && !attributes_need_mount(cd->rd_bmval)) {
3004                         ignore_crossmnt = 1;
3005                         goto out_encode;
3006                 }
3007                 /*
3008                  * Why the heck aren't we just using nfsd_lookup??
3009                  * Different "."/".." handling?  Something else?
3010                  * At least, add a comment here to explain....
3011                  */
3012                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3013                 if (err) {
3014                         nfserr = nfserrno(err);
3015                         goto out_put;
3016                 }
3017                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3018                 if (nfserr)
3019                         goto out_put;
3020
3021         }
3022 out_encode:
3023         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3024                                         cd->rd_rqstp, ignore_crossmnt);
3025 out_put:
3026         dput(dentry);
3027         exp_put(exp);
3028         return nfserr;
3029 }
3030
3031 static __be32 *
3032 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3033 {
3034         __be32 *p;
3035
3036         p = xdr_reserve_space(xdr, 20);
3037         if (!p)
3038                 return NULL;
3039         *p++ = htonl(2);
3040         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3041         *p++ = htonl(0);                         /* bmval1 */
3042
3043         *p++ = htonl(4);     /* attribute length */
3044         *p++ = nfserr;       /* no htonl */
3045         return p;
3046 }
3047
3048 static int
3049 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3050                     loff_t offset, u64 ino, unsigned int d_type)
3051 {
3052         struct readdir_cd *ccd = ccdv;
3053         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3054         struct xdr_stream *xdr = cd->xdr;
3055         int start_offset = xdr->buf->len;
3056         int cookie_offset;
3057         u32 name_and_cookie;
3058         int entry_bytes;
3059         __be32 nfserr = nfserr_toosmall;
3060         __be64 wire_offset;
3061         __be32 *p;
3062
3063         /* In nfsv4, "." and ".." never make it onto the wire.. */
3064         if (name && isdotent(name, namlen)) {
3065                 cd->common.err = nfs_ok;
3066                 return 0;
3067         }
3068
3069         if (cd->cookie_offset) {
3070                 wire_offset = cpu_to_be64(offset);
3071                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3072                                                         &wire_offset, 8);
3073         }
3074
3075         p = xdr_reserve_space(xdr, 4);
3076         if (!p)
3077                 goto fail;
3078         *p++ = xdr_one;                             /* mark entry present */
3079         cookie_offset = xdr->buf->len;
3080         p = xdr_reserve_space(xdr, 3*4 + namlen);
3081         if (!p)
3082                 goto fail;
3083         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3084         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3085
3086         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3087         switch (nfserr) {
3088         case nfs_ok:
3089                 break;
3090         case nfserr_resource:
3091                 nfserr = nfserr_toosmall;
3092                 goto fail;
3093         case nfserr_noent:
3094                 xdr_truncate_encode(xdr, start_offset);
3095                 goto skip_entry;
3096         case nfserr_jukebox:
3097                 /*
3098                  * The pseudoroot should only display dentries that lead to
3099                  * exports. If we get EJUKEBOX here, then we can't tell whether
3100                  * this entry should be included. Just fail the whole READDIR
3101                  * with NFS4ERR_DELAY in that case, and hope that the situation
3102                  * will resolve itself by the client's next attempt.
3103                  */
3104                 if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT)
3105                         goto fail;
3106                 /* fallthrough */
3107         default:
3108                 /*
3109                  * If the client requested the RDATTR_ERROR attribute,
3110                  * we stuff the error code into this attribute
3111                  * and continue.  If this attribute was not requested,
3112                  * then in accordance with the spec, we fail the
3113                  * entire READDIR operation(!)
3114                  */
3115                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3116                         goto fail;
3117                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3118                 if (p == NULL) {
3119                         nfserr = nfserr_toosmall;
3120                         goto fail;
3121                 }
3122         }
3123         nfserr = nfserr_toosmall;
3124         entry_bytes = xdr->buf->len - start_offset;
3125         if (entry_bytes > cd->rd_maxcount)
3126                 goto fail;
3127         cd->rd_maxcount -= entry_bytes;
3128         /*
3129          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and
3130          * notes that it could be zero. If it is zero, then the server
3131          * should enforce only the rd_maxcount value.
3132          */
3133         if (cd->rd_dircount) {
3134                 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3135                 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3136                         goto fail;
3137                 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3138                 if (!cd->rd_dircount)
3139                         cd->rd_maxcount = 0;
3140         }
3141
3142         cd->cookie_offset = cookie_offset;
3143 skip_entry:
3144         cd->common.err = nfs_ok;
3145         return 0;
3146 fail:
3147         xdr_truncate_encode(xdr, start_offset);
3148         cd->common.err = nfserr;
3149         return -EINVAL;
3150 }
3151
3152 static __be32
3153 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3154 {
3155         __be32 *p;
3156
3157         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3158         if (!p)
3159                 return nfserr_resource;
3160         *p++ = cpu_to_be32(sid->si_generation);
3161         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3162                                         sizeof(stateid_opaque_t));
3163         return 0;
3164 }
3165
3166 static __be32
3167 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3168 {
3169         struct xdr_stream *xdr = &resp->xdr;
3170         __be32 *p;
3171
3172         p = xdr_reserve_space(xdr, 8);
3173         if (!p)
3174                 return nfserr_resource;
3175         *p++ = cpu_to_be32(access->ac_supported);
3176         *p++ = cpu_to_be32(access->ac_resp_access);
3177         return 0;
3178 }
3179
3180 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3181 {
3182         struct xdr_stream *xdr = &resp->xdr;
3183         __be32 *p;
3184
3185         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3186         if (!p)
3187                 return nfserr_resource;
3188         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3189                                         NFS4_MAX_SESSIONID_LEN);
3190         *p++ = cpu_to_be32(bcts->dir);
3191         /* Upshifting from TCP to RDMA is not supported */
3192         *p++ = cpu_to_be32(0);
3193         return 0;
3194 }
3195
3196 static __be32
3197 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3198 {
3199         struct xdr_stream *xdr = &resp->xdr;
3200
3201         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3202 }
3203
3204
3205 static __be32
3206 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3207 {
3208         struct xdr_stream *xdr = &resp->xdr;
3209         __be32 *p;
3210
3211         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3212         if (!p)
3213                 return nfserr_resource;
3214         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3215                                                 NFS4_VERIFIER_SIZE);
3216         return 0;
3217 }
3218
3219 static __be32
3220 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3221 {
3222         struct xdr_stream *xdr = &resp->xdr;
3223         __be32 *p;
3224
3225         p = xdr_reserve_space(xdr, 20);
3226         if (!p)
3227                 return nfserr_resource;
3228         encode_cinfo(p, &create->cr_cinfo);
3229         nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3230                         create->cr_bmval[1], create->cr_bmval[2]);
3231         return 0;
3232 }
3233
3234 static __be32
3235 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3236 {
3237         struct svc_fh *fhp = getattr->ga_fhp;
3238         struct xdr_stream *xdr = &resp->xdr;
3239
3240         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3241                                     getattr->ga_bmval, resp->rqstp, 0);
3242 }
3243
3244 static __be32
3245 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3246 {
3247         struct xdr_stream *xdr = &resp->xdr;
3248         struct svc_fh *fhp = *fhpp;
3249         unsigned int len;
3250         __be32 *p;
3251
3252         len = fhp->fh_handle.fh_size;
3253         p = xdr_reserve_space(xdr, len + 4);
3254         if (!p)
3255                 return nfserr_resource;
3256         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3257         return 0;
3258 }
3259
3260 /*
3261 * Including all fields other than the name, a LOCK4denied structure requires
3262 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3263 */
3264 static __be32
3265 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3266 {
3267         struct xdr_netobj *conf = &ld->ld_owner;
3268         __be32 *p;
3269
3270 again:
3271         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3272         if (!p) {
3273                 /*
3274                  * Don't fail to return the result just because we can't
3275                  * return the conflicting open:
3276                  */
3277                 if (conf->len) {
3278                         kfree(conf->data);
3279                         conf->len = 0;
3280                         conf->data = NULL;
3281                         goto again;
3282                 }
3283                 return nfserr_resource;
3284         }
3285         p = xdr_encode_hyper(p, ld->ld_start);
3286         p = xdr_encode_hyper(p, ld->ld_length);
3287         *p++ = cpu_to_be32(ld->ld_type);
3288         if (conf->len) {
3289                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3290                 p = xdr_encode_opaque(p, conf->data, conf->len);
3291                 kfree(conf->data);
3292         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3293                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3294                 *p++ = cpu_to_be32(0); /* length of owner name */
3295         }
3296         return nfserr_denied;
3297 }
3298
3299 static __be32
3300 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3301 {
3302         struct xdr_stream *xdr = &resp->xdr;
3303
3304         if (!nfserr)
3305                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3306         else if (nfserr == nfserr_denied)
3307                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3308
3309         return nfserr;
3310 }
3311
3312 static __be32
3313 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3314 {
3315         struct xdr_stream *xdr = &resp->xdr;
3316
3317         if (nfserr == nfserr_denied)
3318                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3319         return nfserr;
3320 }
3321
3322 static __be32
3323 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3324 {
3325         struct xdr_stream *xdr = &resp->xdr;
3326
3327         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3328 }
3329
3330
3331 static __be32
3332 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3333 {
3334         struct xdr_stream *xdr = &resp->xdr;
3335         __be32 *p;
3336
3337         p = xdr_reserve_space(xdr, 20);
3338         if (!p)
3339                 return nfserr_resource;
3340         p = encode_cinfo(p, &link->li_cinfo);
3341         return 0;
3342 }
3343
3344
3345 static __be32
3346 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3347 {
3348         struct xdr_stream *xdr = &resp->xdr;
3349         __be32 *p;
3350
3351         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3352         if (nfserr)
3353                 return nfserr;
3354         p = xdr_reserve_space(xdr, 24);
3355         if (!p)
3356                 return nfserr_resource;
3357         p = encode_cinfo(p, &open->op_cinfo);
3358         *p++ = cpu_to_be32(open->op_rflags);
3359
3360         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3361                                         open->op_bmval[2]);
3362         if (nfserr)
3363                 return nfserr;
3364
3365         p = xdr_reserve_space(xdr, 4);
3366         if (!p)
3367                 return nfserr_resource;
3368
3369         *p++ = cpu_to_be32(open->op_delegate_type);
3370         switch (open->op_delegate_type) {
3371         case NFS4_OPEN_DELEGATE_NONE:
3372                 break;
3373         case NFS4_OPEN_DELEGATE_READ:
3374                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3375                 if (nfserr)
3376                         return nfserr;
3377                 p = xdr_reserve_space(xdr, 20);
3378                 if (!p)
3379                         return nfserr_resource;
3380                 *p++ = cpu_to_be32(open->op_recall);
3381
3382                 /*
3383                  * TODO: ACE's in delegations
3384                  */
3385                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3386                 *p++ = cpu_to_be32(0);
3387                 *p++ = cpu_to_be32(0);
3388                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3389                 break;
3390         case NFS4_OPEN_DELEGATE_WRITE:
3391                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3392                 if (nfserr)
3393                         return nfserr;
3394                 p = xdr_reserve_space(xdr, 32);
3395                 if (!p)
3396                         return nfserr_resource;
3397                 *p++ = cpu_to_be32(open->op_recall);
3398
3399                 /*
3400                  * TODO: space_limit's in delegations
3401                  */
3402                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3403                 *p++ = cpu_to_be32(~(u32)0);
3404                 *p++ = cpu_to_be32(~(u32)0);
3405
3406                 /*
3407                  * TODO: ACE's in delegations
3408                  */
3409                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3410                 *p++ = cpu_to_be32(0);
3411                 *p++ = cpu_to_be32(0);
3412                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3413                 break;
3414         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3415                 switch (open->op_why_no_deleg) {
3416                 case WND4_CONTENTION:
3417                 case WND4_RESOURCE:
3418                         p = xdr_reserve_space(xdr, 8);
3419                         if (!p)
3420                                 return nfserr_resource;
3421                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3422                         /* deleg signaling not supported yet: */
3423                         *p++ = cpu_to_be32(0);
3424                         break;
3425                 default:
3426                         p = xdr_reserve_space(xdr, 4);
3427                         if (!p)
3428                                 return nfserr_resource;
3429                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3430                 }
3431                 break;
3432         default:
3433                 BUG();
3434         }
3435         /* XXX save filehandle here */
3436         return 0;
3437 }
3438
3439 static __be32
3440 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3441 {
3442         struct xdr_stream *xdr = &resp->xdr;
3443
3444         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3445 }
3446
3447 static __be32
3448 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3449 {
3450         struct xdr_stream *xdr = &resp->xdr;
3451
3452         return nfsd4_encode_stateid(xdr, &od->od_stateid);
3453 }
3454
3455 static __be32 nfsd4_encode_splice_read(
3456                                 struct nfsd4_compoundres *resp,
3457                                 struct nfsd4_read *read,
3458                                 struct file *file, unsigned long maxcount)
3459 {
3460         struct xdr_stream *xdr = &resp->xdr;
3461         struct xdr_buf *buf = xdr->buf;
3462         u32 eof;
3463         long len;
3464         int space_left;
3465         __be32 nfserr;
3466         __be32 *p = xdr->p - 2;
3467
3468         /* Make sure there will be room for padding if needed */
3469         if (xdr->end - xdr->p < 1)
3470                 return nfserr_resource;
3471
3472         len = maxcount;
3473         nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3474                                   file, read->rd_offset, &maxcount);
3475         read->rd_length = maxcount;
3476         if (nfserr) {
3477                 /*
3478                  * nfsd_splice_actor may have already messed with the
3479                  * page length; reset it so as not to confuse
3480                  * xdr_truncate_encode:
3481                  */
3482                 buf->page_len = 0;
3483                 return nfserr;
3484         }
3485
3486         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3487                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3488
3489         *(p++) = htonl(eof);
3490         *(p++) = htonl(maxcount);
3491
3492         buf->page_len = maxcount;
3493         buf->len += maxcount;
3494         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3495                                                         / PAGE_SIZE;
3496
3497         /* Use rest of head for padding and remaining ops: */
3498         buf->tail[0].iov_base = xdr->p;
3499         buf->tail[0].iov_len = 0;
3500         xdr->iov = buf->tail;
3501         if (maxcount&3) {
3502                 int pad = 4 - (maxcount&3);
3503
3504                 *(xdr->p++) = 0;
3505
3506                 buf->tail[0].iov_base += maxcount&3;
3507                 buf->tail[0].iov_len = pad;
3508                 buf->len += pad;
3509         }
3510
3511         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3512                                 buf->buflen - buf->len);
3513         buf->buflen = buf->len + space_left;
3514         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3515
3516         return 0;
3517 }
3518
3519 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3520                                  struct nfsd4_read *read,
3521                                  struct file *file, unsigned long maxcount)
3522 {
3523         struct xdr_stream *xdr = &resp->xdr;
3524         u32 eof;
3525         int v;
3526         int starting_len = xdr->buf->len - 8;
3527         long len;
3528         int thislen;
3529         __be32 nfserr;
3530         __be32 tmp;
3531         __be32 *p;
3532         u32 zzz = 0;
3533         int pad;
3534
3535         len = maxcount;
3536         v = 0;
3537
3538         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3539         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3540         WARN_ON_ONCE(!p);
3541         resp->rqstp->rq_vec[v].iov_base = p;
3542         resp->rqstp->rq_vec[v].iov_len = thislen;
3543         v++;
3544         len -= thislen;
3545
3546         while (len) {
3547                 thislen = min_t(long, len, PAGE_SIZE);
3548                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3549                 WARN_ON_ONCE(!p);
3550                 resp->rqstp->rq_vec[v].iov_base = p;
3551                 resp->rqstp->rq_vec[v].iov_len = thislen;
3552                 v++;
3553                 len -= thislen;
3554         }
3555         read->rd_vlen = v;
3556
3557         len = maxcount;
3558         nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3559                             resp->rqstp->rq_vec, read->rd_vlen, &maxcount);
3560         read->rd_length = maxcount;
3561         if (nfserr)
3562                 return nfserr;
3563         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3564
3565         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3566                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3567
3568         tmp = htonl(eof);
3569         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3570         tmp = htonl(maxcount);
3571         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3572
3573         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3574         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3575                                                                 &zzz, pad);
3576         return 0;
3577
3578 }
3579
3580 static __be32
3581 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3582                   struct nfsd4_read *read)
3583 {
3584         unsigned long maxcount;
3585         struct xdr_stream *xdr = &resp->xdr;
3586         struct file *file = read->rd_filp;
3587         int starting_len = xdr->buf->len;
3588         struct raparms *ra = NULL;
3589         __be32 *p;
3590
3591         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3592         if (!p) {
3593                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3594                 return nfserr_resource;
3595         }
3596         if (resp->xdr.buf->page_len &&
3597             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3598                 WARN_ON_ONCE(1);
3599                 return nfserr_serverfault;
3600         }
3601         xdr_commit_encode(xdr);
3602
3603         maxcount = svc_max_payload(resp->rqstp);
3604         maxcount = min_t(unsigned long, maxcount,
3605                          (xdr->buf->buflen - xdr->buf->len));
3606         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3607
3608         if (read->rd_tmp_file)
3609                 ra = nfsd_init_raparms(file);
3610
3611         if (file->f_op->splice_read &&
3612             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3613                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3614         else
3615                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3616
3617         if (ra)
3618                 nfsd_put_raparams(file, ra);
3619
3620         if (nfserr)
3621                 xdr_truncate_encode(xdr, starting_len);
3622
3623         return nfserr;
3624 }
3625
3626 static __be32
3627 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3628 {
3629         int maxcount;
3630         __be32 wire_count;
3631         int zero = 0;
3632         struct xdr_stream *xdr = &resp->xdr;
3633         int length_offset = xdr->buf->len;
3634         __be32 *p;
3635
3636         p = xdr_reserve_space(xdr, 4);
3637         if (!p)
3638                 return nfserr_resource;
3639         maxcount = PAGE_SIZE;
3640
3641         p = xdr_reserve_space(xdr, maxcount);
3642         if (!p)
3643                 return nfserr_resource;
3644         /*
3645          * XXX: By default, vfs_readlink() will truncate symlinks if they
3646          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
3647          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3648          * that truncation occurred, and return NFS4ERR_RESOURCE.
3649          */
3650         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3651                                                 (char *)p, &maxcount);
3652         if (nfserr == nfserr_isdir)
3653                 nfserr = nfserr_inval;
3654         if (nfserr) {
3655                 xdr_truncate_encode(xdr, length_offset);
3656                 return nfserr;
3657         }
3658
3659         wire_count = htonl(maxcount);
3660         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3661         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3662         if (maxcount & 3)
3663                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3664                                                 &zero, 4 - (maxcount&3));
3665         return 0;
3666 }
3667
3668 static __be32
3669 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3670 {
3671         int maxcount;
3672         int bytes_left;
3673         loff_t offset;
3674         __be64 wire_offset;
3675         struct xdr_stream *xdr = &resp->xdr;
3676         int starting_len = xdr->buf->len;
3677         __be32 *p;
3678
3679         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3680         if (!p)
3681                 return nfserr_resource;
3682
3683         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3684         *p++ = cpu_to_be32(0);
3685         *p++ = cpu_to_be32(0);
3686         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3687                                 - (char *)resp->xdr.buf->head[0].iov_base;
3688
3689         /*
3690          * Number of bytes left for directory entries allowing for the
3691          * final 8 bytes of the readdir and a following failed op:
3692          */
3693         bytes_left = xdr->buf->buflen - xdr->buf->len
3694                         - COMPOUND_ERR_SLACK_SPACE - 8;
3695         if (bytes_left < 0) {
3696                 nfserr = nfserr_resource;
3697                 goto err_no_verf;
3698         }
3699         maxcount = svc_max_payload(resp->rqstp);
3700         maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3701         /*
3702          * Note the rfc defines rd_maxcount as the size of the
3703          * READDIR4resok structure, which includes the verifier above
3704          * and the 8 bytes encoded at the end of this function:
3705          */
3706         if (maxcount < 16) {
3707                 nfserr = nfserr_toosmall;
3708                 goto err_no_verf;
3709         }
3710         maxcount = min_t(int, maxcount-16, bytes_left);
3711
3712         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3713         if (!readdir->rd_dircount)
3714                 readdir->rd_dircount = svc_max_payload(resp->rqstp);
3715
3716         readdir->xdr = xdr;
3717         readdir->rd_maxcount = maxcount;
3718         readdir->common.err = 0;
3719         readdir->cookie_offset = 0;
3720
3721         offset = readdir->rd_cookie;
3722         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3723                               &offset,
3724                               &readdir->common, nfsd4_encode_dirent);
3725         if (nfserr == nfs_ok &&
3726             readdir->common.err == nfserr_toosmall &&
3727             xdr->buf->len == starting_len + 8) {
3728                 /* nothing encoded; which limit did we hit?: */
3729                 if (maxcount - 16 < bytes_left)
3730                         /* It was the fault of rd_maxcount: */
3731                         nfserr = nfserr_toosmall;
3732                 else
3733                         /* We ran out of buffer space: */
3734                         nfserr = nfserr_resource;
3735         }
3736         if (nfserr)
3737                 goto err_no_verf;
3738
3739         if (readdir->cookie_offset) {
3740                 wire_offset = cpu_to_be64(offset);
3741                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3742                                                         &wire_offset, 8);
3743         }
3744
3745         p = xdr_reserve_space(xdr, 8);
3746         if (!p) {
3747                 WARN_ON_ONCE(1);
3748                 goto err_no_verf;
3749         }
3750         *p++ = 0;       /* no more entries */
3751         *p++ = htonl(readdir->common.err == nfserr_eof);
3752
3753         return 0;
3754 err_no_verf:
3755         xdr_truncate_encode(xdr, starting_len);
3756         return nfserr;
3757 }
3758
3759 static __be32
3760 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3761 {
3762         struct xdr_stream *xdr = &resp->xdr;
3763         __be32 *p;
3764
3765         p = xdr_reserve_space(xdr, 20);
3766         if (!p)
3767                 return nfserr_resource;
3768         p = encode_cinfo(p, &remove->rm_cinfo);
3769         return 0;
3770 }
3771
3772 static __be32
3773 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3774 {
3775         struct xdr_stream *xdr = &resp->xdr;
3776         __be32 *p;
3777
3778         p = xdr_reserve_space(xdr, 40);
3779         if (!p)
3780                 return nfserr_resource;
3781         p = encode_cinfo(p, &rename->rn_sinfo);
3782         p = encode_cinfo(p, &rename->rn_tinfo);
3783         return 0;
3784 }
3785
3786 static __be32
3787 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
3788 {
3789         u32 i, nflavs, supported;
3790         struct exp_flavor_info *flavs;
3791         struct exp_flavor_info def_flavs[2];
3792         __be32 *p, *flavorsp;
3793         static bool report = true;
3794
3795         if (exp->ex_nflavors) {
3796                 flavs = exp->ex_flavors;
3797                 nflavs = exp->ex_nflavors;
3798         } else { /* Handling of some defaults in absence of real secinfo: */
3799                 flavs = def_flavs;
3800                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3801                         nflavs = 2;
3802                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3803                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3804                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3805                         nflavs = 1;
3806                         flavs[0].pseudoflavor
3807                                         = svcauth_gss_flavor(exp->ex_client);
3808                 } else {
3809                         nflavs = 1;
3810                         flavs[0].pseudoflavor
3811                                         = exp->ex_client->flavour->flavour;
3812                 }
3813         }
3814
3815         supported = 0;
3816         p = xdr_reserve_space(xdr, 4);
3817         if (!p)
3818                 return nfserr_resource;
3819         flavorsp = p++;         /* to be backfilled later */
3820
3821         for (i = 0; i < nflavs; i++) {
3822                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3823                 struct rpcsec_gss_info info;
3824
3825                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3826                         supported++;
3827                         p = xdr_reserve_space(xdr, 4 + 4 +
3828                                               XDR_LEN(info.oid.len) + 4 + 4);
3829                         if (!p)
3830                                 return nfserr_resource;
3831                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3832                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3833                         *p++ = cpu_to_be32(info.qop);
3834                         *p++ = cpu_to_be32(info.service);
3835                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3836                         supported++;
3837                         p = xdr_reserve_space(xdr, 4);
3838                         if (!p)
3839                                 return nfserr_resource;
3840                         *p++ = cpu_to_be32(pf);
3841                 } else {
3842                         if (report)
3843                                 pr_warn("NFS: SECINFO: security flavor %u "
3844                                         "is not supported\n", pf);
3845                 }
3846         }
3847
3848         if (nflavs != supported)
3849                 report = false;
3850         *flavorsp = htonl(supported);
3851         return 0;
3852 }
3853
3854 static __be32
3855 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3856                      struct nfsd4_secinfo *secinfo)
3857 {
3858         struct xdr_stream *xdr = &resp->xdr;
3859
3860         return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
3861 }
3862
3863 static __be32
3864 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3865                      struct nfsd4_secinfo_no_name *secinfo)
3866 {
3867         struct xdr_stream *xdr = &resp->xdr;
3868
3869         return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
3870 }
3871
3872 /*
3873  * The SETATTR encode routine is special -- it always encodes a bitmap,
3874  * regardless of the error status.
3875  */
3876 static __be32
3877 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3878 {
3879         struct xdr_stream *xdr = &resp->xdr;
3880         __be32 *p;
3881
3882         p = xdr_reserve_space(xdr, 16);
3883         if (!p)
3884                 return nfserr_resource;
3885         if (nfserr) {
3886                 *p++ = cpu_to_be32(3);
3887                 *p++ = cpu_to_be32(0);
3888                 *p++ = cpu_to_be32(0);
3889                 *p++ = cpu_to_be32(0);
3890         }
3891         else {
3892                 *p++ = cpu_to_be32(3);
3893                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3894                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3895                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3896         }
3897         return nfserr;
3898 }
3899
3900 static __be32
3901 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3902 {
3903         struct xdr_stream *xdr = &resp->xdr;
3904         __be32 *p;
3905
3906         if (!nfserr) {
3907                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3908                 if (!p)
3909                         return nfserr_resource;
3910                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3911                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3912                                                 NFS4_VERIFIER_SIZE);
3913         }
3914         else if (nfserr == nfserr_clid_inuse) {
3915                 p = xdr_reserve_space(xdr, 8);
3916                 if (!p)
3917                         return nfserr_resource;
3918                 *p++ = cpu_to_be32(0);
3919                 *p++ = cpu_to_be32(0);
3920         }
3921         return nfserr;
3922 }
3923
3924 static __be32
3925 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3926 {
3927         struct xdr_stream *xdr = &resp->xdr;
3928         __be32 *p;
3929
3930         p = xdr_reserve_space(xdr, 16);
3931         if (!p)
3932                 return nfserr_resource;
3933         *p++ = cpu_to_be32(write->wr_bytes_written);
3934         *p++ = cpu_to_be32(write->wr_how_written);
3935         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3936                                                 NFS4_VERIFIER_SIZE);
3937         return 0;
3938 }
3939
3940 static __be32
3941 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3942                          struct nfsd4_exchange_id *exid)
3943 {
3944         struct xdr_stream *xdr = &resp->xdr;
3945         __be32 *p;
3946         char *major_id;
3947         char *server_scope;
3948         int major_id_sz;
3949         int server_scope_sz;
3950         uint64_t minor_id = 0;
3951
3952         major_id = utsname()->nodename;
3953         major_id_sz = strlen(major_id);
3954         server_scope = utsname()->nodename;
3955         server_scope_sz = strlen(server_scope);
3956
3957         p = xdr_reserve_space(xdr,
3958                 8 /* eir_clientid */ +
3959                 4 /* eir_sequenceid */ +
3960                 4 /* eir_flags */ +
3961                 4 /* spr_how */);
3962         if (!p)
3963                 return nfserr_resource;
3964
3965         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3966         *p++ = cpu_to_be32(exid->seqid);
3967         *p++ = cpu_to_be32(exid->flags);
3968
3969         *p++ = cpu_to_be32(exid->spa_how);
3970
3971         switch (exid->spa_how) {
3972         case SP4_NONE:
3973                 break;
3974         case SP4_MACH_CRED:
3975                 /* spo_must_enforce bitmap: */
3976                 nfserr = nfsd4_encode_bitmap(xdr,
3977                                         exid->spo_must_enforce[0],
3978                                         exid->spo_must_enforce[1],
3979                                         exid->spo_must_enforce[2]);
3980                 if (nfserr)
3981                         return nfserr;
3982                 /* spo_must_allow bitmap: */
3983                 nfserr = nfsd4_encode_bitmap(xdr,
3984                                         exid->spo_must_allow[0],
3985                                         exid->spo_must_allow[1],
3986                                         exid->spo_must_allow[2]);
3987                 if (nfserr)
3988                         return nfserr;
3989                 break;
3990         default:
3991                 WARN_ON_ONCE(1);
3992         }
3993
3994         p = xdr_reserve_space(xdr,
3995                 8 /* so_minor_id */ +
3996                 4 /* so_major_id.len */ +
3997                 (XDR_QUADLEN(major_id_sz) * 4) +
3998                 4 /* eir_server_scope.len */ +
3999                 (XDR_QUADLEN(server_scope_sz) * 4) +
4000                 4 /* eir_server_impl_id.count (0) */);
4001         if (!p)
4002                 return nfserr_resource;
4003
4004         /* The server_owner struct */
4005         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
4006         /* major id */
4007         p = xdr_encode_opaque(p, major_id, major_id_sz);
4008
4009         /* Server scope */
4010         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4011
4012         /* Implementation id */
4013         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
4014         return 0;
4015 }
4016
4017 static __be32
4018 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4019                             struct nfsd4_create_session *sess)
4020 {
4021         struct xdr_stream *xdr = &resp->xdr;
4022         __be32 *p;
4023
4024         p = xdr_reserve_space(xdr, 24);
4025         if (!p)
4026                 return nfserr_resource;
4027         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4028                                         NFS4_MAX_SESSIONID_LEN);
4029         *p++ = cpu_to_be32(sess->seqid);
4030         *p++ = cpu_to_be32(sess->flags);
4031
4032         p = xdr_reserve_space(xdr, 28);
4033         if (!p)
4034                 return nfserr_resource;
4035         *p++ = cpu_to_be32(0); /* headerpadsz */
4036         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4037         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4038         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4039         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4040         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4041         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4042
4043         if (sess->fore_channel.nr_rdma_attrs) {
4044                 p = xdr_reserve_space(xdr, 4);
4045                 if (!p)
4046                         return nfserr_resource;
4047                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4048         }
4049
4050         p = xdr_reserve_space(xdr, 28);
4051         if (!p)
4052                 return nfserr_resource;
4053         *p++ = cpu_to_be32(0); /* headerpadsz */
4054         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4055         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4056         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4057         *p++ = cpu_to_be32(sess->back_channel.maxops);
4058         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4059         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4060
4061         if (sess->back_channel.nr_rdma_attrs) {
4062                 p = xdr_reserve_space(xdr, 4);
4063                 if (!p)
4064                         return nfserr_resource;
4065                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4066         }
4067         return 0;
4068 }
4069
4070 static __be32
4071 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4072                       struct nfsd4_sequence *seq)
4073 {
4074         struct xdr_stream *xdr = &resp->xdr;
4075         __be32 *p;
4076
4077         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4078         if (!p)
4079                 return nfserr_resource;
4080         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4081                                         NFS4_MAX_SESSIONID_LEN);
4082         *p++ = cpu_to_be32(seq->seqid);
4083         *p++ = cpu_to_be32(seq->slotid);
4084         /* Note slotid's are numbered from zero: */
4085         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4086         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4087         *p++ = cpu_to_be32(seq->status_flags);
4088
4089         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4090         return 0;
4091 }
4092
4093 static __be32
4094 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4095                           struct nfsd4_test_stateid *test_stateid)
4096 {
4097         struct xdr_stream *xdr = &resp->xdr;
4098         struct nfsd4_test_stateid_id *stateid, *next;
4099         __be32 *p;
4100
4101         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4102         if (!p)
4103                 return nfserr_resource;
4104         *p++ = htonl(test_stateid->ts_num_ids);
4105
4106         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4107                 *p++ = stateid->ts_id_status;
4108         }
4109
4110         return 0;
4111 }
4112
4113 #ifdef CONFIG_NFSD_PNFS
4114 static __be32
4115 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4116                 struct nfsd4_getdeviceinfo *gdev)
4117 {
4118         struct xdr_stream *xdr = &resp->xdr;
4119         const struct nfsd4_layout_ops *ops;
4120         u32 starting_len = xdr->buf->len, needed_len;
4121         __be32 *p;
4122
4123         p = xdr_reserve_space(xdr, 4);
4124         if (!p)
4125                 return nfserr_resource;
4126
4127         *p++ = cpu_to_be32(gdev->gd_layout_type);
4128
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         if (gdev->gd_notify_types) {
4143                 p = xdr_reserve_space(xdr, 4 + 4);
4144                 if (!p)
4145                         return nfserr_resource;
4146                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4147                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4148         } else {
4149                 p = xdr_reserve_space(xdr, 4);
4150                 if (!p)
4151                         return nfserr_resource;
4152                 *p++ = 0;
4153         }
4154
4155         return 0;
4156 toosmall:
4157         dprintk("%s: maxcount too small\n", __func__);
4158         needed_len = xdr->buf->len + 4 /* notifications */;
4159         xdr_truncate_encode(xdr, starting_len);
4160         p = xdr_reserve_space(xdr, 4);
4161         if (!p)
4162                 return nfserr_resource;
4163         *p++ = cpu_to_be32(needed_len);
4164         return nfserr_toosmall;
4165 }
4166
4167 static __be32
4168 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4169                 struct nfsd4_layoutget *lgp)
4170 {
4171         struct xdr_stream *xdr = &resp->xdr;
4172         const struct nfsd4_layout_ops *ops;
4173         __be32 *p;
4174
4175         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4176         if (!p)
4177                 return nfserr_resource;
4178
4179         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4180         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4181         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4182                                     sizeof(stateid_opaque_t));
4183
4184         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4185         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4186         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4187         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4188         *p++ = cpu_to_be32(lgp->lg_layout_type);
4189
4190         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4191         return ops->encode_layoutget(xdr, lgp);
4192 }
4193
4194 static __be32
4195 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4196                           struct nfsd4_layoutcommit *lcp)
4197 {
4198         struct xdr_stream *xdr = &resp->xdr;
4199         __be32 *p;
4200
4201         p = xdr_reserve_space(xdr, 4);
4202         if (!p)
4203                 return nfserr_resource;
4204         *p++ = cpu_to_be32(lcp->lc_size_chg);
4205         if (lcp->lc_size_chg) {
4206                 p = xdr_reserve_space(xdr, 8);
4207                 if (!p)
4208                         return nfserr_resource;
4209                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4210         }
4211
4212         return 0;
4213 }
4214
4215 static __be32
4216 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4217                 struct nfsd4_layoutreturn *lrp)
4218 {
4219         struct xdr_stream *xdr = &resp->xdr;
4220         __be32 *p;
4221
4222         p = xdr_reserve_space(xdr, 4);
4223         if (!p)
4224                 return nfserr_resource;
4225         *p++ = cpu_to_be32(lrp->lrs_present);
4226         if (lrp->lrs_present)
4227                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4228         return 0;
4229 }
4230 #endif /* CONFIG_NFSD_PNFS */
4231
4232 static __be32
4233 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4234 {
4235         __be32 *p;
4236
4237         p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4238         if (!p)
4239                 return nfserr_resource;
4240
4241         *p++ = cpu_to_be32(0);
4242         p = xdr_encode_hyper(p, write->wr_bytes_written);
4243         *p++ = cpu_to_be32(write->wr_stable_how);
4244         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4245                                     NFS4_VERIFIER_SIZE);
4246         return nfs_ok;
4247 }
4248
4249 static __be32
4250 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4251                   struct nfsd4_copy *copy)
4252 {
4253         __be32 *p;
4254
4255         nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
4256         if (nfserr)
4257                 return nfserr;
4258
4259         p = xdr_reserve_space(&resp->xdr, 4 + 4);
4260         *p++ = xdr_one; /* cr_consecutive */
4261         *p++ = cpu_to_be32(copy->cp_synchronous);
4262         return 0;
4263 }
4264
4265 static __be32
4266 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4267                   struct nfsd4_seek *seek)
4268 {
4269         __be32 *p;
4270
4271         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4272         *p++ = cpu_to_be32(seek->seek_eof);
4273         p = xdr_encode_hyper(p, seek->seek_pos);
4274
4275         return 0;
4276 }
4277
4278 static __be32
4279 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4280 {
4281         return nfserr;
4282 }
4283
4284 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4285
4286 /*
4287  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4288  * since we don't need to filter out obsolete ops as this is
4289  * done in the decoding phase.
4290  */
4291 static const nfsd4_enc nfsd4_enc_ops[] = {
4292         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4293         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4294         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4295         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4296         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4297         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4298         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4299         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4300         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4301         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4302         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4303         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4304         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4305         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4306         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4307         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4308         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4309         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4310         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4311         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4312         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4313         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4314         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4315         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4316         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4317         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4318         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4319         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4320         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4321         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4322         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4323         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4324         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4325         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4326         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4327         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4328         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4329
4330         /* NFSv4.1 operations */
4331         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4332         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4333         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4334         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4335         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4336         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4337         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4338 #ifdef CONFIG_NFSD_PNFS
4339         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4340         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4341         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4342         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4343         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4344 #else
4345         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4346         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4347         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4348         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4349         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4350 #endif
4351         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4352         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4353         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4354         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4355         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4356         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4357         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4358
4359         /* NFSv4.2 operations */
4360         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4361         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
4362         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4363         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4364         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4365         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4366         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4367         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4368         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4369         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4370         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4371         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4372         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4373 };
4374
4375 /*
4376  * Calculate whether we still have space to encode repsize bytes.
4377  * There are two considerations:
4378  *     - For NFS versions >=4.1, the size of the reply must stay within
4379  *       session limits
4380  *     - For all NFS versions, we must stay within limited preallocated
4381  *       buffer space.
4382  *
4383  * This is called before the operation is processed, so can only provide
4384  * an upper estimate.  For some nonidempotent operations (such as
4385  * getattr), it's not necessarily a problem if that estimate is wrong,
4386  * as we can fail it after processing without significant side effects.
4387  */
4388 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4389 {
4390         struct xdr_buf *buf = &resp->rqstp->rq_res;
4391         struct nfsd4_slot *slot = resp->cstate.slot;
4392
4393         if (buf->len + respsize <= buf->buflen)
4394                 return nfs_ok;
4395         if (!nfsd4_has_session(&resp->cstate))
4396                 return nfserr_resource;
4397         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4398                 WARN_ON_ONCE(1);
4399                 return nfserr_rep_too_big_to_cache;
4400         }
4401         return nfserr_rep_too_big;
4402 }
4403
4404 void
4405 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4406 {
4407         struct xdr_stream *xdr = &resp->xdr;
4408         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4409         struct svc_rqst *rqstp = resp->rqstp;
4410         const struct nfsd4_operation *opdesc = op->opdesc;
4411         int post_err_offset;
4412         nfsd4_enc encoder;
4413         __be32 *p;
4414
4415         p = xdr_reserve_space(xdr, 8);
4416         if (!p) {
4417                 WARN_ON_ONCE(1);
4418                 return;
4419         }
4420         *p++ = cpu_to_be32(op->opnum);
4421         post_err_offset = xdr->buf->len;
4422
4423         if (op->opnum == OP_ILLEGAL)
4424                 goto status;
4425         if (op->status && opdesc &&
4426                         !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
4427                 goto status;
4428         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4429                !nfsd4_enc_ops[op->opnum]);
4430         encoder = nfsd4_enc_ops[op->opnum];
4431         op->status = encoder(resp, op->status, &op->u);
4432         if (opdesc && opdesc->op_release)
4433                 opdesc->op_release(&op->u);
4434         xdr_commit_encode(xdr);
4435
4436         /* nfsd4_check_resp_size guarantees enough room for error status */
4437         if (!op->status) {
4438                 int space_needed = 0;
4439                 if (!nfsd4_last_compound_op(rqstp))
4440                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4441                 op->status = nfsd4_check_resp_size(resp, space_needed);
4442         }
4443         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4444                 struct nfsd4_slot *slot = resp->cstate.slot;
4445
4446                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4447                         op->status = nfserr_rep_too_big_to_cache;
4448                 else
4449                         op->status = nfserr_rep_too_big;
4450         }
4451         if (op->status == nfserr_resource ||
4452             op->status == nfserr_rep_too_big ||
4453             op->status == nfserr_rep_too_big_to_cache) {
4454                 /*
4455                  * The operation may have already been encoded or
4456                  * partially encoded.  No op returns anything additional
4457                  * in the case of one of these three errors, so we can
4458                  * just truncate back to after the status.  But it's a
4459                  * bug if we had to do this on a non-idempotent op:
4460                  */
4461                 warn_on_nonidempotent_op(op);
4462                 xdr_truncate_encode(xdr, post_err_offset);
4463         }
4464         if (so) {
4465                 int len = xdr->buf->len - post_err_offset;
4466
4467                 so->so_replay.rp_status = op->status;
4468                 so->so_replay.rp_buflen = len;
4469                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4470                                                 so->so_replay.rp_buf, len);
4471         }
4472 status:
4473         /* Note that op->status is already in network byte order: */
4474         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4475 }
4476
4477 /*
4478  * Encode the reply stored in the stateowner reply cache
4479  *
4480  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4481  * previously sent already encoded operation.
4482  */
4483 void
4484 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4485 {
4486         __be32 *p;
4487         struct nfs4_replay *rp = op->replay;
4488
4489         BUG_ON(!rp);
4490
4491         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4492         if (!p) {
4493                 WARN_ON_ONCE(1);
4494                 return;
4495         }
4496         *p++ = cpu_to_be32(op->opnum);
4497         *p++ = rp->rp_status;  /* already xdr'ed */
4498
4499         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4500 }
4501
4502 int
4503 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4504 {
4505         return xdr_ressize_check(rqstp, p);
4506 }
4507
4508 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4509 {
4510         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4511
4512         if (args->ops != args->iops) {
4513                 kfree(args->ops);
4514                 args->ops = args->iops;
4515         }
4516         kfree(args->tmpp);
4517         args->tmpp = NULL;
4518         while (args->to_free) {
4519                 struct svcxdr_tmpbuf *tb = args->to_free;
4520                 args->to_free = tb->next;
4521                 kfree(tb);
4522         }
4523 }
4524
4525 int
4526 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4527 {
4528         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4529
4530         if (rqstp->rq_arg.head[0].iov_len % 4) {
4531                 /* client is nuts */
4532                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4533                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4534                 return 0;
4535         }
4536         args->p = p;
4537         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4538         args->pagelist = rqstp->rq_arg.pages;
4539         args->pagelen = rqstp->rq_arg.page_len;
4540         args->tail = false;
4541         args->tmpp = NULL;
4542         args->to_free = NULL;
4543         args->ops = args->iops;
4544         args->rqstp = rqstp;
4545
4546         return !nfsd4_decode_compound(args);
4547 }
4548
4549 int
4550 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4551 {
4552         /*
4553          * All that remains is to write the tag and operation count...
4554          */
4555         struct nfsd4_compoundres *resp = rqstp->rq_resp;
4556         struct xdr_buf *buf = resp->xdr.buf;
4557
4558         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4559                                  buf->tail[0].iov_len);
4560
4561         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4562
4563         p = resp->tagp;
4564         *p++ = htonl(resp->taglen);
4565         memcpy(p, resp->tag, resp->taglen);
4566         p += XDR_QUADLEN(resp->taglen);
4567         *p++ = htonl(resp->opcnt);
4568
4569         nfsd4_sequence_done(resp);
4570         return 1;
4571 }
4572
4573 /*
4574  * Local variables:
4575  *  c-basic-offset: 8
4576  * End:
4577  */