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