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         if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
 458             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         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
 479                 if (!umask)
 480                         goto xdr_error;
 481                 READ_BUF(8);
 482                 len += 8;
 483                 dummy32 = be32_to_cpup(p++);
 484                 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
 485                 dummy32 = be32_to_cpup(p++);
 486                 *umask = dummy32 & S_IRWXUGO;
 487                 iattr->ia_valid |= ATTR_MODE;
 488         }
 489         if (len != expected_len)
 490                 goto xdr_error;
 491
 492         DECODE_TAIL;
 493 }
 494
 495 static __be32
 496 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 497 {
 498         DECODE_HEAD;
 499
 500         READ_BUF(sizeof(stateid_t));
 501         sid->si_generation = be32_to_cpup(p++);
 502         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 503
 504         DECODE_TAIL;
 505 }
 506
 507 static __be32
 508 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 509 {
 510         DECODE_HEAD;
 511
 512         READ_BUF(4);
 513         access->ac_req_access = be32_to_cpup(p++);
 514
 515         DECODE_TAIL;
 516 }
 517
 518 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 519 {
 520         DECODE_HEAD;
 521         u32 dummy, uid, gid;
 522         char *machine_name;
 523         int i;
 524         int nr_secflavs;
 525
 526         /* callback_sec_params4 */
 527         READ_BUF(4);
 528         nr_secflavs = be32_to_cpup(p++);
 529         if (nr_secflavs)
 530                 cbs->flavor = (u32)(-1);
 531         else
 532                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 533                 cbs->flavor = 0;
 534         for (i = 0; i < nr_secflavs; ++i) {
 535                 READ_BUF(4);
 536                 dummy = be32_to_cpup(p++);
 537                 switch (dummy) {
 538                 case RPC_AUTH_NULL:
 539                         /* Nothing to read */
 540                         if (cbs->flavor == (u32)(-1))
 541                                 cbs->flavor = RPC_AUTH_NULL;
 542                         break;
 543                 case RPC_AUTH_UNIX:
 544                         READ_BUF(8);
 545                         /* stamp */
 546                         dummy = be32_to_cpup(p++);
 547
 548                         /* machine name */
 549                         dummy = be32_to_cpup(p++);
 550                         READ_BUF(dummy);
 551                         SAVEMEM(machine_name, dummy);
 552
 553                         /* uid, gid */
 554                         READ_BUF(8);
 555                         uid = be32_to_cpup(p++);
 556                         gid = be32_to_cpup(p++);
 557
 558                         /* more gids */
 559                         READ_BUF(4);
 560                         dummy = be32_to_cpup(p++);
 561                         READ_BUF(dummy * 4);
 562                         if (cbs->flavor == (u32)(-1)) {
 563                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 564                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 565                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 566                                         cbs->uid = kuid;
 567                                         cbs->gid = kgid;
 568                                         cbs->flavor = RPC_AUTH_UNIX;
 569                                 } else {
 570                                         dprintk("RPC_AUTH_UNIX with invalid"
 571                                                 "uid or gid ignoring!\n");
 572                                 }
 573                         }
 574                         break;
 575                 case RPC_AUTH_GSS:
 576                         dprintk("RPC_AUTH_GSS callback secflavor "
 577                                 "not supported!\n");
 578                         READ_BUF(8);
 579                         /* gcbp_service */
 580                         dummy = be32_to_cpup(p++);
 581                         /* gcbp_handle_from_server */
 582                         dummy = be32_to_cpup(p++);
 583                         READ_BUF(dummy);
 584                         p += XDR_QUADLEN(dummy);
 585                         /* gcbp_handle_from_client */
 586                         READ_BUF(4);
 587                         dummy = be32_to_cpup(p++);
 588                         READ_BUF(dummy);
 589                         break;
 590                 default:
 591                         dprintk("Illegal callback secflavor\n");
 592                         return nfserr_inval;
 593                 }
 594         }
 595         DECODE_TAIL;
 596 }
 597
 598 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 599 {
 600         DECODE_HEAD;
 601
 602         READ_BUF(4);
 603         bc->bc_cb_program = be32_to_cpup(p++);
 604         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 605
 606         DECODE_TAIL;
 607 }
 608
 609 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 610 {
 611         DECODE_HEAD;
 612
 613         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 614         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 615         bcts->dir = be32_to_cpup(p++);
 616         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 617          * could help us figure out we should be using it. */
 618         DECODE_TAIL;
 619 }
 620
 621 static __be32
 622 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 623 {
 624         DECODE_HEAD;
 625
 626         READ_BUF(4);
 627         close->cl_seqid = be32_to_cpup(p++);
 628         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 629
 630         DECODE_TAIL;
 631 }
 632
 633
 634 static __be32
 635 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 636 {
 637         DECODE_HEAD;
 638
 639         READ_BUF(12);
 640         p = xdr_decode_hyper(p, &commit->co_offset);
 641         commit->co_count = be32_to_cpup(p++);
 642
 643         DECODE_TAIL;
 644 }
 645
 646 static __be32
 647 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 648 {
 649         DECODE_HEAD;
 650
 651         READ_BUF(4);
 652         create->cr_type = be32_to_cpup(p++);
 653         switch (create->cr_type) {
 654         case NF4LNK:
 655                 READ_BUF(4);
 656                 create->cr_datalen = be32_to_cpup(p++);
 657                 READ_BUF(create->cr_datalen);
 658                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 659                 if (!create->cr_data)
 660                         return nfserr_jukebox;
 661                 break;
 662         case NF4BLK:
 663         case NF4CHR:
 664                 READ_BUF(8);
 665                 create->cr_specdata1 = be32_to_cpup(p++);
 666                 create->cr_specdata2 = be32_to_cpup(p++);
 667                 break;
 668         case NF4SOCK:
 669         case NF4FIFO:
 670         case NF4DIR:
 671         default:
 672                 break;
 673         }
 674
 675         READ_BUF(4);
 676         create->cr_namelen = be32_to_cpup(p++);
 677         READ_BUF(create->cr_namelen);
 678         SAVEMEM(create->cr_name, create->cr_namelen);
 679         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 680                 return status;
 681
 682         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 683                                     &create->cr_acl, &create->cr_label,
 684                                     &create->cr_umask);
 685         if (status)
 686                 goto out;
 687
 688         DECODE_TAIL;
 689 }
 690
 691 static inline __be32
 692 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 693 {
 694         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 695 }
 696
 697 static inline __be32
 698 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 699 {
 700         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 701 }
 702
 703 static __be32
 704 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 705 {
 706         DECODE_HEAD;
 707
 708         READ_BUF(4);
 709         link->li_namelen = be32_to_cpup(p++);
 710         READ_BUF(link->li_namelen);
 711         SAVEMEM(link->li_name, link->li_namelen);
 712         if ((status = check_filename(link->li_name, link->li_namelen)))
 713                 return status;
 714
 715         DECODE_TAIL;
 716 }
 717
 718 static __be32
 719 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 720 {
 721         DECODE_HEAD;
 722
 723         /*
 724         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 725         */
 726         READ_BUF(28);
 727         lock->lk_type = be32_to_cpup(p++);
 728         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 729                 goto xdr_error;
 730         lock->lk_reclaim = be32_to_cpup(p++);
 731         p = xdr_decode_hyper(p, &lock->lk_offset);
 732         p = xdr_decode_hyper(p, &lock->lk_length);
 733         lock->lk_is_new = be32_to_cpup(p++);
 734
 735         if (lock->lk_is_new) {
 736                 READ_BUF(4);
 737                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 738                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 739                 if (status)
 740                         return status;
 741                 READ_BUF(8 + sizeof(clientid_t));
 742                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 743                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 744                 lock->lk_new_owner.len = be32_to_cpup(p++);
 745                 READ_BUF(lock->lk_new_owner.len);
 746                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 747         } else {
 748                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 749                 if (status)
 750                         return status;
 751                 READ_BUF(4);
 752                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 753         }
 754
 755         DECODE_TAIL;
 756 }
 757
 758 static __be32
 759 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 760 {
 761         DECODE_HEAD;
 762
 763         READ_BUF(32);
 764         lockt->lt_type = be32_to_cpup(p++);
 765         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 766                 goto xdr_error;
 767         p = xdr_decode_hyper(p, &lockt->lt_offset);
 768         p = xdr_decode_hyper(p, &lockt->lt_length);
 769         COPYMEM(&lockt->lt_clientid, 8);
 770         lockt->lt_owner.len = be32_to_cpup(p++);
 771         READ_BUF(lockt->lt_owner.len);
 772         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 773
 774         DECODE_TAIL;
 775 }
 776
 777 static __be32
 778 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 779 {
 780         DECODE_HEAD;
 781
 782         READ_BUF(8);
 783         locku->lu_type = be32_to_cpup(p++);
 784         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 785                 goto xdr_error;
 786         locku->lu_seqid = be32_to_cpup(p++);
 787         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 788         if (status)
 789                 return status;
 790         READ_BUF(16);
 791         p = xdr_decode_hyper(p, &locku->lu_offset);
 792         p = xdr_decode_hyper(p, &locku->lu_length);
 793
 794         DECODE_TAIL;
 795 }
 796
 797 static __be32
 798 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 799 {
 800         DECODE_HEAD;
 801
 802         READ_BUF(4);
 803         lookup->lo_len = be32_to_cpup(p++);
 804         READ_BUF(lookup->lo_len);
 805         SAVEMEM(lookup->lo_name, lookup->lo_len);
 806         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 807                 return status;
 808
 809         DECODE_TAIL;
 810 }
 811
 812 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 813 {
 814         __be32 *p;
 815         u32 w;
 816
 817         READ_BUF(4);
 818         w = be32_to_cpup(p++);
 819         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 820         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 821         if (deleg_when)
 822                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 823
 824         switch (w & NFS4_SHARE_ACCESS_MASK) {
 825         case NFS4_SHARE_ACCESS_READ:
 826         case NFS4_SHARE_ACCESS_WRITE:
 827         case NFS4_SHARE_ACCESS_BOTH:
 828                 break;
 829         default:
 830                 return nfserr_bad_xdr;
 831         }
 832         w &= ~NFS4_SHARE_ACCESS_MASK;
 833         if (!w)
 834                 return nfs_ok;
 835         if (!argp->minorversion)
 836                 return nfserr_bad_xdr;
 837         switch (w & NFS4_SHARE_WANT_MASK) {
 838         case NFS4_SHARE_WANT_NO_PREFERENCE:
 839         case NFS4_SHARE_WANT_READ_DELEG:
 840         case NFS4_SHARE_WANT_WRITE_DELEG:
 841         case NFS4_SHARE_WANT_ANY_DELEG:
 842         case NFS4_SHARE_WANT_NO_DELEG:
 843         case NFS4_SHARE_WANT_CANCEL:
 844                 break;
 845         default:
 846                 return nfserr_bad_xdr;
 847         }
 848         w &= ~NFS4_SHARE_WANT_MASK;
 849         if (!w)
 850                 return nfs_ok;
 851
 852         if (!deleg_when)        /* open_downgrade */
 853                 return nfserr_inval;
 854         switch (w) {
 855         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 856         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 857         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 858               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 859                 return nfs_ok;
 860         }
 861 xdr_error:
 862         return nfserr_bad_xdr;
 863 }
 864
 865 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 866 {
 867         __be32 *p;
 868
 869         READ_BUF(4);
 870         *x = be32_to_cpup(p++);
 871         /* Note: unlinke access bits, deny bits may be zero. */
 872         if (*x & ~NFS4_SHARE_DENY_BOTH)
 873                 return nfserr_bad_xdr;
 874         return nfs_ok;
 875 xdr_error:
 876         return nfserr_bad_xdr;
 877 }
 878
 879 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 880 {
 881         __be32 *p;
 882
 883         READ_BUF(4);
 884         o->len = be32_to_cpup(p++);
 885
 886         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 887                 return nfserr_bad_xdr;
 888
 889         READ_BUF(o->len);
 890         SAVEMEM(o->data, o->len);
 891         return nfs_ok;
 892 xdr_error:
 893         return nfserr_bad_xdr;
 894 }
 895
 896 static __be32
 897 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 898 {
 899         DECODE_HEAD;
 900         u32 dummy;
 901
 902         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 903         open->op_iattr.ia_valid = 0;
 904         open->op_openowner = NULL;
 905
 906         open->op_xdr_error = 0;
 907         /* seqid, share_access, share_deny, clientid, ownerlen */
 908         READ_BUF(4);
 909         open->op_seqid = be32_to_cpup(p++);
 910         /* decode, yet ignore deleg_when until supported */
 911         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 912                                            &open->op_deleg_want, &dummy);
 913         if (status)
 914                 goto xdr_error;
 915         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 916         if (status)
 917                 goto xdr_error;
 918         READ_BUF(sizeof(clientid_t));
 919         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 920         status = nfsd4_decode_opaque(argp, &open->op_owner);
 921         if (status)
 922                 goto xdr_error;
 923         READ_BUF(4);
 924         open->op_create = be32_to_cpup(p++);
 925         switch (open->op_create) {
 926         case NFS4_OPEN_NOCREATE:
 927                 break;
 928         case NFS4_OPEN_CREATE:
 929                 READ_BUF(4);
 930                 open->op_createmode = be32_to_cpup(p++);
 931                 switch (open->op_createmode) {
 932                 case NFS4_CREATE_UNCHECKED:
 933                 case NFS4_CREATE_GUARDED:
 934                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 935                                 &open->op_iattr, &open->op_acl, &open->op_label,
 936                                 &open->op_umask);
 937                         if (status)
 938                                 goto out;
 939                         break;
 940                 case NFS4_CREATE_EXCLUSIVE:
 941                         READ_BUF(NFS4_VERIFIER_SIZE);
 942                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 943                         break;
 944                 case NFS4_CREATE_EXCLUSIVE4_1:
 945                         if (argp->minorversion < 1)
 946                                 goto xdr_error;
 947                         READ_BUF(NFS4_VERIFIER_SIZE);
 948                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 949                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 950                                 &open->op_iattr, &open->op_acl, &open->op_label,
 951                                 &open->op_umask);
 952                         if (status)
 953                                 goto out;
 954                         break;
 955                 default:
 956                         goto xdr_error;
 957                 }
 958                 break;
 959         default:
 960                 goto xdr_error;
 961         }
 962
 963         /* open_claim */
 964         READ_BUF(4);
 965         open->op_claim_type = be32_to_cpup(p++);
 966         switch (open->op_claim_type) {
 967         case NFS4_OPEN_CLAIM_NULL:
 968         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 969                 READ_BUF(4);
 970                 open->op_fname.len = be32_to_cpup(p++);
 971                 READ_BUF(open->op_fname.len);
 972                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 973                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 974                         return status;
 975                 break;
 976         case NFS4_OPEN_CLAIM_PREVIOUS:
 977                 READ_BUF(4);
 978                 open->op_delegate_type = be32_to_cpup(p++);
 979                 break;
 980         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 981                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 982                 if (status)
 983                         return status;
 984                 READ_BUF(4);
 985                 open->op_fname.len = be32_to_cpup(p++);
 986                 READ_BUF(open->op_fname.len);
 987                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 988                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 989                         return status;
 990                 break;
 991         case NFS4_OPEN_CLAIM_FH:
 992         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 993                 if (argp->minorversion < 1)
 994                         goto xdr_error;
 995                 /* void */
 996                 break;
 997         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 998                 if (argp->minorversion < 1)
 999                         goto xdr_error;
1000                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1001                 if (status)
1002                         return status;
1003                 break;
1004         default:
1005                 goto xdr_error;
1006         }
1007
1008         DECODE_TAIL;
1009 }
1010
1011 static __be32
1012 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1013 {
1014         DECODE_HEAD;
1015
1016         if (argp->minorversion >= 1)
1017                 return nfserr_notsupp;
1018
1019         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1020         if (status)
1021                 return status;
1022         READ_BUF(4);
1023         open_conf->oc_seqid = be32_to_cpup(p++);
1024
1025         DECODE_TAIL;
1026 }
1027
1028 static __be32
1029 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1030 {
1031         DECODE_HEAD;
1032
1033         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1034         if (status)
1035                 return status;
1036         READ_BUF(4);
1037         open_down->od_seqid = be32_to_cpup(p++);
1038         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1039                                            &open_down->od_deleg_want, NULL);
1040         if (status)
1041                 return status;
1042         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1043         if (status)
1044                 return status;
1045         DECODE_TAIL;
1046 }
1047
1048 static __be32
1049 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1050 {
1051         DECODE_HEAD;
1052
1053         READ_BUF(4);
1054         putfh->pf_fhlen = be32_to_cpup(p++);
1055         if (putfh->pf_fhlen > NFS4_FHSIZE)
1056                 goto xdr_error;
1057         READ_BUF(putfh->pf_fhlen);
1058         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1059
1060         DECODE_TAIL;
1061 }
1062
1063 static __be32
1064 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1065 {
1066         if (argp->minorversion == 0)
1067                 return nfs_ok;
1068         return nfserr_notsupp;
1069 }
1070
1071 static __be32
1072 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1073 {
1074         DECODE_HEAD;
1075
1076         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1077         if (status)
1078                 return status;
1079         READ_BUF(12);
1080         p = xdr_decode_hyper(p, &read->rd_offset);
1081         read->rd_length = be32_to_cpup(p++);
1082
1083         DECODE_TAIL;
1084 }
1085
1086 static __be32
1087 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1088 {
1089         DECODE_HEAD;
1090
1091         READ_BUF(24);
1092         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1093         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1094         readdir->rd_dircount = be32_to_cpup(p++);
1095         readdir->rd_maxcount = be32_to_cpup(p++);
1096         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1097                 goto out;
1098
1099         DECODE_TAIL;
1100 }
1101
1102 static __be32
1103 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1104 {
1105         DECODE_HEAD;
1106
1107         READ_BUF(4);
1108         remove->rm_namelen = be32_to_cpup(p++);
1109         READ_BUF(remove->rm_namelen);
1110         SAVEMEM(remove->rm_name, remove->rm_namelen);
1111         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1112                 return status;
1113
1114         DECODE_TAIL;
1115 }
1116
1117 static __be32
1118 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1119 {
1120         DECODE_HEAD;
1121
1122         READ_BUF(4);
1123         rename->rn_snamelen = be32_to_cpup(p++);
1124         READ_BUF(rename->rn_snamelen);
1125         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1126         READ_BUF(4);
1127         rename->rn_tnamelen = be32_to_cpup(p++);
1128         READ_BUF(rename->rn_tnamelen);
1129         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1130         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1131                 return status;
1132         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1133                 return status;
1134
1135         DECODE_TAIL;
1136 }
1137
1138 static __be32
1139 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1140 {
1141         DECODE_HEAD;
1142
1143         if (argp->minorversion >= 1)
1144                 return nfserr_notsupp;
1145
1146         READ_BUF(sizeof(clientid_t));
1147         COPYMEM(clientid, sizeof(clientid_t));
1148
1149         DECODE_TAIL;
1150 }
1151
1152 static __be32
1153 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1154                      struct nfsd4_secinfo *secinfo)
1155 {
1156         DECODE_HEAD;
1157
1158         READ_BUF(4);
1159         secinfo->si_namelen = be32_to_cpup(p++);
1160         READ_BUF(secinfo->si_namelen);
1161         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1162         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1163         if (status)
1164                 return status;
1165         DECODE_TAIL;
1166 }
1167
1168 static __be32
1169 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1170                      struct nfsd4_secinfo_no_name *sin)
1171 {
1172         DECODE_HEAD;
1173
1174         READ_BUF(4);
1175         sin->sin_style = be32_to_cpup(p++);
1176         DECODE_TAIL;
1177 }
1178
1179 static __be32
1180 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1181 {
1182         __be32 status;
1183
1184         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1185         if (status)
1186                 return status;
1187         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1188                                   &setattr->sa_acl, &setattr->sa_label, NULL);
1189 }
1190
1191 static __be32
1192 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1193 {
1194         DECODE_HEAD;
1195
1196         if (argp->minorversion >= 1)
1197                 return nfserr_notsupp;
1198
1199         READ_BUF(NFS4_VERIFIER_SIZE);
1200         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1201
1202         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1203         if (status)
1204                 return nfserr_bad_xdr;
1205         READ_BUF(8);
1206         setclientid->se_callback_prog = be32_to_cpup(p++);
1207         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1208         READ_BUF(setclientid->se_callback_netid_len);
1209         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1210         READ_BUF(4);
1211         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1212
1213         READ_BUF(setclientid->se_callback_addr_len);
1214         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1215         READ_BUF(4);
1216         setclientid->se_callback_ident = be32_to_cpup(p++);
1217
1218         DECODE_TAIL;
1219 }
1220
1221 static __be32
1222 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1223 {
1224         DECODE_HEAD;
1225
1226         if (argp->minorversion >= 1)
1227                 return nfserr_notsupp;
1228
1229         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1230         COPYMEM(&scd_c->sc_clientid, 8);
1231         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1232
1233         DECODE_TAIL;
1234 }
1235
1236 /* Also used for NVERIFY */
1237 static __be32
1238 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1239 {
1240         DECODE_HEAD;
1241
1242         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1243                 goto out;
1244
1245         /* For convenience's sake, we compare raw xdr'd attributes in
1246          * nfsd4_proc_verify */
1247
1248         READ_BUF(4);
1249         verify->ve_attrlen = be32_to_cpup(p++);
1250         READ_BUF(verify->ve_attrlen);
1251         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1252
1253         DECODE_TAIL;
1254 }
1255
1256 static __be32
1257 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1258 {
1259         int avail;
1260         int len;
1261         DECODE_HEAD;
1262
1263         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1264         if (status)
1265                 return status;
1266         READ_BUF(16);
1267         p = xdr_decode_hyper(p, &write->wr_offset);
1268         write->wr_stable_how = be32_to_cpup(p++);
1269         if (write->wr_stable_how > NFS_FILE_SYNC)
1270                 goto xdr_error;
1271         write->wr_buflen = be32_to_cpup(p++);
1272
1273         /* Sorry .. no magic macros for this.. *
1274          * READ_BUF(write->wr_buflen);
1275          * SAVEMEM(write->wr_buf, write->wr_buflen);
1276          */
1277         avail = (char*)argp->end - (char*)argp->p;
1278         if (avail + argp->pagelen < write->wr_buflen) {
1279                 dprintk("NFSD: xdr error (%s:%d)\n",
1280                                 __FILE__, __LINE__);
1281                 goto xdr_error;
1282         }
1283         write->wr_head.iov_base = p;
1284         write->wr_head.iov_len = avail;
1285         write->wr_pagelist = argp->pagelist;
1286
1287         len = XDR_QUADLEN(write->wr_buflen) << 2;
1288         if (len >= avail) {
1289                 int pages;
1290
1291                 len -= avail;
1292
1293                 pages = len >> PAGE_SHIFT;
1294                 argp->pagelist += pages;
1295                 argp->pagelen -= pages * PAGE_SIZE;
1296                 len -= pages * PAGE_SIZE;
1297
1298                 next_decode_page(argp);
1299         }
1300         argp->p += XDR_QUADLEN(len);
1301
1302         DECODE_TAIL;
1303 }
1304
1305 static __be32
1306 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1307 {
1308         DECODE_HEAD;
1309
1310         if (argp->minorversion >= 1)
1311                 return nfserr_notsupp;
1312
1313         READ_BUF(12);
1314         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1315         rlockowner->rl_owner.len = be32_to_cpup(p++);
1316         READ_BUF(rlockowner->rl_owner.len);
1317         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1318
1319         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1320                 return nfserr_inval;
1321         DECODE_TAIL;
1322 }
1323
1324 static __be32
1325 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1326                          struct nfsd4_exchange_id *exid)
1327 {
1328         int dummy, tmp;
1329         DECODE_HEAD;
1330
1331         READ_BUF(NFS4_VERIFIER_SIZE);
1332         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1333
1334         status = nfsd4_decode_opaque(argp, &exid->clname);
1335         if (status)
1336                 return nfserr_bad_xdr;
1337
1338         READ_BUF(4);
1339         exid->flags = be32_to_cpup(p++);
1340
1341         /* Ignore state_protect4_a */
1342         READ_BUF(4);
1343         exid->spa_how = be32_to_cpup(p++);
1344         switch (exid->spa_how) {
1345         case SP4_NONE:
1346                 break;
1347         case SP4_MACH_CRED:
1348                 /* spo_must_enforce */
1349                 status = nfsd4_decode_bitmap(argp,
1350                                         exid->spo_must_enforce);
1351                 if (status)
1352                         goto out;
1353                 /* spo_must_allow */
1354                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1355                 if (status)
1356                         goto out;
1357                 break;
1358         case SP4_SSV:
1359                 /* ssp_ops */
1360                 READ_BUF(4);
1361                 dummy = be32_to_cpup(p++);
1362                 READ_BUF(dummy * 4);
1363                 p += dummy;
1364
1365                 READ_BUF(4);
1366                 dummy = be32_to_cpup(p++);
1367                 READ_BUF(dummy * 4);
1368                 p += dummy;
1369
1370                 /* ssp_hash_algs<> */
1371                 READ_BUF(4);
1372                 tmp = be32_to_cpup(p++);
1373                 while (tmp--) {
1374                         READ_BUF(4);
1375                         dummy = be32_to_cpup(p++);
1376                         READ_BUF(dummy);
1377                         p += XDR_QUADLEN(dummy);
1378                 }
1379
1380                 /* ssp_encr_algs<> */
1381                 READ_BUF(4);
1382                 tmp = be32_to_cpup(p++);
1383                 while (tmp--) {
1384                         READ_BUF(4);
1385                         dummy = be32_to_cpup(p++);
1386                         READ_BUF(dummy);
1387                         p += XDR_QUADLEN(dummy);
1388                 }
1389
1390                 /* ssp_window and ssp_num_gss_handles */
1391                 READ_BUF(8);
1392                 dummy = be32_to_cpup(p++);
1393                 dummy = be32_to_cpup(p++);
1394                 break;
1395         default:
1396                 goto xdr_error;
1397         }
1398
1399         /* Ignore Implementation ID */
1400         READ_BUF(4);    /* nfs_impl_id4 array length */
1401         dummy = be32_to_cpup(p++);
1402
1403         if (dummy > 1)
1404                 goto xdr_error;
1405
1406         if (dummy == 1) {
1407                 /* nii_domain */
1408                 READ_BUF(4);
1409                 dummy = be32_to_cpup(p++);
1410                 READ_BUF(dummy);
1411                 p += XDR_QUADLEN(dummy);
1412
1413                 /* nii_name */
1414                 READ_BUF(4);
1415                 dummy = be32_to_cpup(p++);
1416                 READ_BUF(dummy);
1417                 p += XDR_QUADLEN(dummy);
1418
1419                 /* nii_date */
1420                 READ_BUF(12);
1421                 p += 3;
1422         }
1423         DECODE_TAIL;
1424 }
1425
1426 static __be32
1427 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1428                             struct nfsd4_create_session *sess)
1429 {
1430         DECODE_HEAD;
1431         u32 dummy;
1432
1433         READ_BUF(16);
1434         COPYMEM(&sess->clientid, 8);
1435         sess->seqid = be32_to_cpup(p++);
1436         sess->flags = be32_to_cpup(p++);
1437
1438         /* Fore channel attrs */
1439         READ_BUF(28);
1440         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1441         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1442         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1443         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1444         sess->fore_channel.maxops = be32_to_cpup(p++);
1445         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1446         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1447         if (sess->fore_channel.nr_rdma_attrs == 1) {
1448                 READ_BUF(4);
1449                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1450         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1451                 dprintk("Too many fore channel attr bitmaps!\n");
1452                 goto xdr_error;
1453         }
1454
1455         /* Back channel attrs */
1456         READ_BUF(28);
1457         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1458         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1459         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1460         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1461         sess->back_channel.maxops = be32_to_cpup(p++);
1462         sess->back_channel.maxreqs = be32_to_cpup(p++);
1463         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1464         if (sess->back_channel.nr_rdma_attrs == 1) {
1465                 READ_BUF(4);
1466                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1467         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1468                 dprintk("Too many back channel attr bitmaps!\n");
1469                 goto xdr_error;
1470         }
1471
1472         READ_BUF(4);
1473         sess->callback_prog = be32_to_cpup(p++);
1474         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1475         DECODE_TAIL;
1476 }
1477
1478 static __be32
1479 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1480                              struct nfsd4_destroy_session *destroy_session)
1481 {
1482         DECODE_HEAD;
1483         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1484         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1485
1486         DECODE_TAIL;
1487 }
1488
1489 static __be32
1490 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1491                           struct nfsd4_free_stateid *free_stateid)
1492 {
1493         DECODE_HEAD;
1494
1495         READ_BUF(sizeof(stateid_t));
1496         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1497         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1498
1499         DECODE_TAIL;
1500 }
1501
1502 static __be32
1503 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1504                       struct nfsd4_sequence *seq)
1505 {
1506         DECODE_HEAD;
1507
1508         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1509         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1510         seq->seqid = be32_to_cpup(p++);
1511         seq->slotid = be32_to_cpup(p++);
1512         seq->maxslots = be32_to_cpup(p++);
1513         seq->cachethis = be32_to_cpup(p++);
1514
1515         DECODE_TAIL;
1516 }
1517
1518 static __be32
1519 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1520 {
1521         int i;
1522         __be32 *p, status;
1523         struct nfsd4_test_stateid_id *stateid;
1524
1525         READ_BUF(4);
1526         test_stateid->ts_num_ids = ntohl(*p++);
1527
1528         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1529
1530         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1531                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1532                 if (!stateid) {
1533                         status = nfserrno(-ENOMEM);
1534                         goto out;
1535                 }
1536
1537                 INIT_LIST_HEAD(&stateid->ts_id_list);
1538                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1539
1540                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1541                 if (status)
1542                         goto out;
1543         }
1544
1545         status = 0;
1546 out:
1547         return status;
1548 xdr_error:
1549         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1550         status = nfserr_bad_xdr;
1551         goto out;
1552 }
1553
1554 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1555 {
1556         DECODE_HEAD;
1557
1558         READ_BUF(8);
1559         COPYMEM(&dc->clientid, 8);
1560
1561         DECODE_TAIL;
1562 }
1563
1564 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1565 {
1566         DECODE_HEAD;
1567
1568         READ_BUF(4);
1569         rc->rca_one_fs = be32_to_cpup(p++);
1570
1571         DECODE_TAIL;
1572 }
1573
1574 #ifdef CONFIG_NFSD_PNFS
1575 static __be32
1576 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1577                 struct nfsd4_getdeviceinfo *gdev)
1578 {
1579         DECODE_HEAD;
1580         u32 num, i;
1581
1582         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1583         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1584         gdev->gd_layout_type = be32_to_cpup(p++);
1585         gdev->gd_maxcount = be32_to_cpup(p++);
1586         num = be32_to_cpup(p++);
1587         if (num) {
1588                 READ_BUF(4 * num);
1589                 gdev->gd_notify_types = be32_to_cpup(p++);
1590                 for (i = 1; i < num; i++) {
1591                         if (be32_to_cpup(p++)) {
1592                                 status = nfserr_inval;
1593                                 goto out;
1594                         }
1595                 }
1596         }
1597         DECODE_TAIL;
1598 }
1599
1600 static __be32
1601 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1602                 struct nfsd4_layoutget *lgp)
1603 {
1604         DECODE_HEAD;
1605
1606         READ_BUF(36);
1607         lgp->lg_signal = be32_to_cpup(p++);
1608         lgp->lg_layout_type = be32_to_cpup(p++);
1609         lgp->lg_seg.iomode = be32_to_cpup(p++);
1610         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1611         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1612         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1613
1614         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1615         if (status)
1616                 return status;
1617
1618         READ_BUF(4);
1619         lgp->lg_maxcount = be32_to_cpup(p++);
1620
1621         DECODE_TAIL;
1622 }
1623
1624 static __be32
1625 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1626                 struct nfsd4_layoutcommit *lcp)
1627 {
1628         DECODE_HEAD;
1629         u32 timechange;
1630
1631         READ_BUF(20);
1632         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1633         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1634         lcp->lc_reclaim = be32_to_cpup(p++);
1635
1636         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1637         if (status)
1638                 return status;
1639
1640         READ_BUF(4);
1641         lcp->lc_newoffset = be32_to_cpup(p++);
1642         if (lcp->lc_newoffset) {
1643                 READ_BUF(8);
1644                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1645         } else
1646                 lcp->lc_last_wr = 0;
1647         READ_BUF(4);
1648         timechange = be32_to_cpup(p++);
1649         if (timechange) {
1650                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1651                 if (status)
1652                         return status;
1653         } else {
1654                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1655         }
1656         READ_BUF(8);
1657         lcp->lc_layout_type = be32_to_cpup(p++);
1658
1659         /*
1660          * Save the layout update in XDR format and let the layout driver deal
1661          * with it later.
1662          */
1663         lcp->lc_up_len = be32_to_cpup(p++);
1664         if (lcp->lc_up_len > 0) {
1665                 READ_BUF(lcp->lc_up_len);
1666                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1667         }
1668
1669         DECODE_TAIL;
1670 }
1671
1672 static __be32
1673 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1674                 struct nfsd4_layoutreturn *lrp)
1675 {
1676         DECODE_HEAD;
1677
1678         READ_BUF(16);
1679         lrp->lr_reclaim = be32_to_cpup(p++);
1680         lrp->lr_layout_type = be32_to_cpup(p++);
1681         lrp->lr_seg.iomode = be32_to_cpup(p++);
1682         lrp->lr_return_type = be32_to_cpup(p++);
1683         if (lrp->lr_return_type == RETURN_FILE) {
1684                 READ_BUF(16);
1685                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1686                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1687
1688                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1689                 if (status)
1690                         return status;
1691
1692                 READ_BUF(4);
1693                 lrp->lrf_body_len = be32_to_cpup(p++);
1694                 if (lrp->lrf_body_len > 0) {
1695                         READ_BUF(lrp->lrf_body_len);
1696                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1697                 }
1698         } else {
1699                 lrp->lr_seg.offset = 0;
1700                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1701         }
1702
1703         DECODE_TAIL;
1704 }
1705 #endif /* CONFIG_NFSD_PNFS */
1706
1707 static __be32
1708 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1709                        struct nfsd4_fallocate *fallocate)
1710 {
1711         DECODE_HEAD;
1712
1713         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1714         if (status)
1715                 return status;
1716
1717         READ_BUF(16);
1718         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1719         xdr_decode_hyper(p, &fallocate->falloc_length);
1720
1721         DECODE_TAIL;
1722 }
1723
1724 static __be32
1725 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1726 {
1727         DECODE_HEAD;
1728
1729         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1730         if (status)
1731                 return status;
1732         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1733         if (status)
1734                 return status;
1735
1736         READ_BUF(8 + 8 + 8);
1737         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1738         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1739         p = xdr_decode_hyper(p, &clone->cl_count);
1740         DECODE_TAIL;
1741 }
1742
1743 static __be32
1744 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1745 {
1746         DECODE_HEAD;
1747         unsigned int tmp;
1748
1749         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1750         if (status)
1751                 return status;
1752         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1753         if (status)
1754                 return status;
1755
1756         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1757         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1758         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1759         p = xdr_decode_hyper(p, &copy->cp_count);
1760         p++; /* ca_consecutive: we always do consecutive copies */
1761         copy->cp_synchronous = be32_to_cpup(p++);
1762         tmp = be32_to_cpup(p); /* Source server list not supported */
1763
1764         DECODE_TAIL;
1765 }
1766
1767 static __be32
1768 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1769 {
1770         DECODE_HEAD;
1771
1772         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1773         if (status)
1774                 return status;
1775
1776         READ_BUF(8 + 4);
1777         p = xdr_decode_hyper(p, &seek->seek_offset);
1778         seek->seek_whence = be32_to_cpup(p);
1779
1780         DECODE_TAIL;
1781 }
1782
1783 static __be32
1784 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1785 {
1786         return nfs_ok;
1787 }
1788
1789 static __be32
1790 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1791 {
1792         return nfserr_notsupp;
1793 }
1794
1795 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1796
1797 static const nfsd4_dec nfsd4_dec_ops[] = {
1798         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1799         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1800         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1801         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1802         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1803         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1804         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1805         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1806         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1807         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1808         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1809         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1810         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1811         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1812         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1813         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1814         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1815         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1816         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1817         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1818         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1819         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1820         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1821         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1822         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1823         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1824         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1825         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1826         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1827         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1828         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1829         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1830         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1831         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1832         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1833         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1834         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1835
1836         /* new operations for NFSv4.1 */
1837         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1838         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1839         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1840         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1841         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1842         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1843         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1844 #ifdef CONFIG_NFSD_PNFS
1845         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1846         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1847         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1848         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1849         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1850 #else
1851         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1852         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1853         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1854         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1855         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1856 #endif
1857         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1858         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1859         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1860         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1861         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1862         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1863         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1864
1865         /* new operations for NFSv4.2 */
1866         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1867         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1868         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1869         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1870         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1871         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1872         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1873         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1874         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1875         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1876         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1877         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1878         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1879 };
1880
1881 static inline bool
1882 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1883 {
1884         if (op->opnum < FIRST_NFS4_OP)
1885                 return false;
1886         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1887                 return false;
1888         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1889                 return false;
1890         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1891                 return false;
1892         return true;
1893 }
1894
1895 static __be32
1896 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1897 {
1898         DECODE_HEAD;
1899         struct nfsd4_op *op;
1900         bool cachethis = false;
1901         int auth_slack= argp->rqstp->rq_auth_slack;
1902         int max_reply = auth_slack + 8; /* opcnt, status */
1903         int readcount = 0;
1904         int readbytes = 0;
1905         int i;
1906
1907         READ_BUF(4);
1908         argp->taglen = be32_to_cpup(p++);
1909         READ_BUF(argp->taglen);
1910         SAVEMEM(argp->tag, argp->taglen);
1911         READ_BUF(8);
1912         argp->minorversion = be32_to_cpup(p++);
1913         argp->opcnt = be32_to_cpup(p++);
1914         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1915
1916         if (argp->taglen > NFSD4_MAX_TAGLEN)
1917                 goto xdr_error;
1918         /*
1919          * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
1920          * here, so we return success at the xdr level so that
1921          * nfsd4_proc can handle this is an NFS-level error.
1922          */
1923         if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1924                 return 0;
1925
1926         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1927                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1928                 if (!argp->ops) {
1929                         argp->ops = argp->iops;
1930                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1931                         goto xdr_error;
1932                 }
1933         }
1934
1935         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1936                 argp->opcnt = 0;
1937
1938         for (i = 0; i < argp->opcnt; i++) {
1939                 op = &argp->ops[i];
1940                 op->replay = NULL;
1941
1942                 READ_BUF(4);
1943                 op->opnum = be32_to_cpup(p++);
1944
1945                 if (nfsd4_opnum_in_range(argp, op))
1946                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1947                 else {
1948                         op->opnum = OP_ILLEGAL;
1949                         op->status = nfserr_op_illegal;
1950                 }
1951                 op->opdesc = OPDESC(op);
1952                 /*
1953                  * We'll try to cache the result in the DRC if any one
1954                  * op in the compound wants to be cached:
1955                  */
1956                 cachethis |= nfsd4_cache_this_op(op);
1957
1958                 if (op->opnum == OP_READ) {
1959                         readcount++;
1960                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1961                 } else
1962                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1963                 /*
1964                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
1965                  * (Special case because it will just skip encoding this
1966                  * if it runs out of xdr buffer space, and it is the only
1967                  * operation that behaves this way.)
1968                  */
1969                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1970                         max_reply += NFS4_OPAQUE_LIMIT;
1971
1972                 if (op->status) {
1973                         argp->opcnt = i+1;
1974                         break;
1975                 }
1976         }
1977         /* Sessions make the DRC unnecessary: */
1978         if (argp->minorversion)
1979                 cachethis = false;
1980         svc_reserve(argp->rqstp, max_reply + readbytes);
1981         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1982
1983         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1984                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1985
1986         DECODE_TAIL;
1987 }
1988
1989 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
1990                              struct svc_export *exp)
1991 {
1992         if (exp->ex_flags & NFSEXP_V4ROOT) {
1993                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
1994                 *p++ = 0;
1995         } else if (IS_I_VERSION(inode)) {
1996                 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
1997         } else {
1998                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1999                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2000         }
2001         return p;
2002 }
2003
2004 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2005 {
2006         *p++ = cpu_to_be32(c->atomic);
2007         if (c->change_supported) {
2008                 p = xdr_encode_hyper(p, c->before_change);
2009                 p = xdr_encode_hyper(p, c->after_change);
2010         } else {
2011                 *p++ = cpu_to_be32(c->before_ctime_sec);
2012                 *p++ = cpu_to_be32(c->before_ctime_nsec);
2013                 *p++ = cpu_to_be32(c->after_ctime_sec);
2014                 *p++ = cpu_to_be32(c->after_ctime_nsec);
2015         }
2016         return p;
2017 }
2018
2019 /* Encode as an array of strings the string given with components
2020  * separated @sep, escaped with esc_enter and esc_exit.
2021  */
2022 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2023                                           char *components, char esc_enter,
2024                                           char esc_exit)
2025 {
2026         __be32 *p;
2027         __be32 pathlen;
2028         int pathlen_offset;
2029         int strlen, count=0;
2030         char *str, *end, *next;
2031
2032         dprintk("nfsd4_encode_components(%s)\n", components);
2033
2034         pathlen_offset = xdr->buf->len;
2035         p = xdr_reserve_space(xdr, 4);
2036         if (!p)
2037                 return nfserr_resource;
2038         p++; /* We will fill this in with @count later */
2039
2040         end = str = components;
2041         while (*end) {
2042                 bool found_esc = false;
2043
2044                 /* try to parse as esc_start, ..., esc_end, sep */
2045                 if (*str == esc_enter) {
2046                         for (; *end && (*end != esc_exit); end++)
2047                                 /* find esc_exit or end of string */;
2048                         next = end + 1;
2049                         if (*end && (!*next || *next == sep)) {
2050                                 str++;
2051                                 found_esc = true;
2052                         }
2053                 }
2054
2055                 if (!found_esc)
2056                         for (; *end && (*end != sep); end++)
2057                                 /* find sep or end of string */;
2058
2059                 strlen = end - str;
2060                 if (strlen) {
2061                         p = xdr_reserve_space(xdr, strlen + 4);
2062                         if (!p)
2063                                 return nfserr_resource;
2064                         p = xdr_encode_opaque(p, str, strlen);
2065                         count++;
2066                 }
2067                 else
2068                         end++;
2069                 if (found_esc)
2070                         end = next;
2071
2072                 str = end;
2073         }
2074         pathlen = htonl(count);
2075         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2076         return 0;
2077 }
2078
2079 /* Encode as an array of strings the string given with components
2080  * separated @sep.
2081  */
2082 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2083                                       char *components)
2084 {
2085         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2086 }
2087
2088 /*
2089  * encode a location element of a fs_locations structure
2090  */
2091 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2092                                         struct nfsd4_fs_location *location)
2093 {
2094         __be32 status;
2095
2096         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2097                                                 '[', ']');
2098         if (status)
2099                 return status;
2100         status = nfsd4_encode_components(xdr, '/', location->path);
2101         if (status)
2102                 return status;
2103         return 0;
2104 }
2105
2106 /*
2107  * Encode a path in RFC3530 'pathname4' format
2108  */
2109 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2110                                 const struct path *root,
2111                                 const struct path *path)
2112 {
2113         struct path cur = *path;
2114         __be32 *p;
2115         struct dentry **components = NULL;
2116         unsigned int ncomponents = 0;
2117         __be32 err = nfserr_jukebox;
2118
2119         dprintk("nfsd4_encode_components(");
2120
2121         path_get(&cur);
2122         /* First walk the path up to the nfsd root, and store the
2123          * dentries/path components in an array.
2124          */
2125         for (;;) {
2126                 if (path_equal(&cur, root))
2127                         break;
2128                 if (cur.dentry == cur.mnt->mnt_root) {
2129                         if (follow_up(&cur))
2130                                 continue;
2131                         goto out_free;
2132                 }
2133                 if ((ncomponents & 15) == 0) {
2134                         struct dentry **new;
2135                         new = krealloc(components,
2136                                         sizeof(*new) * (ncomponents + 16),
2137                                         GFP_KERNEL);
2138                         if (!new)
2139                                 goto out_free;
2140                         components = new;
2141                 }
2142                 components[ncomponents++] = cur.dentry;
2143                 cur.dentry = dget_parent(cur.dentry);
2144         }
2145         err = nfserr_resource;
2146         p = xdr_reserve_space(xdr, 4);
2147         if (!p)
2148                 goto out_free;
2149         *p++ = cpu_to_be32(ncomponents);
2150
2151         while (ncomponents) {
2152                 struct dentry *dentry = components[ncomponents - 1];
2153                 unsigned int len;
2154
2155                 spin_lock(&dentry->d_lock);
2156                 len = dentry->d_name.len;
2157                 p = xdr_reserve_space(xdr, len + 4);
2158                 if (!p) {
2159                         spin_unlock(&dentry->d_lock);
2160                         goto out_free;
2161                 }
2162                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2163                 dprintk("/%pd", dentry);
2164                 spin_unlock(&dentry->d_lock);
2165                 dput(dentry);
2166                 ncomponents--;
2167         }
2168
2169         err = 0;
2170 out_free:
2171         dprintk(")\n");
2172         while (ncomponents)
2173                 dput(components[--ncomponents]);
2174         kfree(components);
2175         path_put(&cur);
2176         return err;
2177 }
2178
2179 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2180                         struct svc_rqst *rqstp, const struct path *path)
2181 {
2182         struct svc_export *exp_ps;
2183         __be32 res;
2184
2185         exp_ps = rqst_find_fsidzero_export(rqstp);
2186         if (IS_ERR(exp_ps))
2187                 return nfserrno(PTR_ERR(exp_ps));
2188         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2189         exp_put(exp_ps);
2190         return res;
2191 }
2192
2193 /*
2194  *  encode a fs_locations structure
2195  */
2196 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2197                         struct svc_rqst *rqstp, struct svc_export *exp)
2198 {
2199         __be32 status;
2200         int i;
2201         __be32 *p;
2202         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2203
2204         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2205         if (status)
2206                 return status;
2207         p = xdr_reserve_space(xdr, 4);
2208         if (!p)
2209                 return nfserr_resource;
2210         *p++ = cpu_to_be32(fslocs->locations_count);
2211         for (i=0; i<fslocs->locations_count; i++) {
2212                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2213                 if (status)
2214                         return status;
2215         }
2216         return 0;
2217 }
2218
2219 static u32 nfs4_file_type(umode_t mode)
2220 {
2221         switch (mode & S_IFMT) {
2222         case S_IFIFO:   return NF4FIFO;
2223         case S_IFCHR:   return NF4CHR;
2224         case S_IFDIR:   return NF4DIR;
2225         case S_IFBLK:   return NF4BLK;
2226         case S_IFLNK:   return NF4LNK;
2227         case S_IFREG:   return NF4REG;
2228         case S_IFSOCK:  return NF4SOCK;
2229         default:        return NF4BAD;
2230         };
2231 }
2232
2233 static inline __be32
2234 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2235                      struct nfs4_ace *ace)
2236 {
2237         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2238                 return nfs4_acl_write_who(xdr, ace->whotype);
2239         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2240                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2241         else
2242                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2243 }
2244
2245 static inline __be32
2246 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2247 {
2248         __be32          *p;
2249         unsigned long   i = hweight_long(layout_types);
2250
2251         p = xdr_reserve_space(xdr, 4 + 4 * i);
2252         if (!p)
2253                 return nfserr_resource;
2254
2255         *p++ = cpu_to_be32(i);
2256
2257         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2258                 if (layout_types & (1 << i))
2259                         *p++ = cpu_to_be32(i);
2260
2261         return 0;
2262 }
2263
2264 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2265                               FATTR4_WORD0_RDATTR_ERROR)
2266 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2267 #define WORD2_ABSENT_FS_ATTRS 0
2268
2269 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2270 static inline __be32
2271 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2272                             void *context, int len)
2273 {
2274         __be32 *p;
2275
2276         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2277         if (!p)
2278                 return nfserr_resource;
2279
2280         /*
2281          * For now we use a 0 here to indicate the null translation; in
2282          * the future we may place a call to translation code here.
2283          */
2284         *p++ = cpu_to_be32(0); /* lfs */
2285         *p++ = cpu_to_be32(0); /* pi */
2286         p = xdr_encode_opaque(p, context, len);
2287         return 0;
2288 }
2289 #else
2290 static inline __be32
2291 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2292                             void *context, int len)
2293 { return 0; }
2294 #endif
2295
2296 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2297 {
2298         /* As per referral draft:  */
2299         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2300             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2301                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2302                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2303                         *rdattr_err = NFSERR_MOVED;
2304                 else
2305                         return nfserr_moved;
2306         }
2307         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2308         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2309         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2310         return 0;
2311 }
2312
2313
2314 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2315 {
2316         struct path path = exp->ex_path;
2317         int err;
2318
2319         path_get(&path);
2320         while (follow_up(&path)) {
2321                 if (path.dentry != path.mnt->mnt_root)
2322                         break;
2323         }
2324         err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2325         path_put(&path);
2326         return err;
2327 }
2328
2329 static __be32
2330 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2331 {
2332         __be32 *p;
2333
2334         if (bmval2) {
2335                 p = xdr_reserve_space(xdr, 16);
2336                 if (!p)
2337                         goto out_resource;
2338                 *p++ = cpu_to_be32(3);
2339                 *p++ = cpu_to_be32(bmval0);
2340                 *p++ = cpu_to_be32(bmval1);
2341                 *p++ = cpu_to_be32(bmval2);
2342         } else if (bmval1) {
2343                 p = xdr_reserve_space(xdr, 12);
2344                 if (!p)
2345                         goto out_resource;
2346                 *p++ = cpu_to_be32(2);
2347                 *p++ = cpu_to_be32(bmval0);
2348                 *p++ = cpu_to_be32(bmval1);
2349         } else {
2350                 p = xdr_reserve_space(xdr, 8);
2351                 if (!p)
2352                         goto out_resource;
2353                 *p++ = cpu_to_be32(1);
2354                 *p++ = cpu_to_be32(bmval0);
2355         }
2356
2357         return 0;
2358 out_resource:
2359         return nfserr_resource;
2360 }
2361
2362 /*
2363  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2364  * ourselves.
2365  */
2366 static __be32
2367 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2368                 struct svc_export *exp,
2369                 struct dentry *dentry, u32 *bmval,
2370                 struct svc_rqst *rqstp, int ignore_crossmnt)
2371 {
2372         u32 bmval0 = bmval[0];
2373         u32 bmval1 = bmval[1];
2374         u32 bmval2 = bmval[2];
2375         struct kstat stat;
2376         struct svc_fh *tempfh = NULL;
2377         struct kstatfs statfs;
2378         __be32 *p;
2379         int starting_len = xdr->buf->len;
2380         int attrlen_offset;
2381         __be32 attrlen;
2382         u32 dummy;
2383         u64 dummy64;
2384         u32 rdattr_err = 0;
2385         __be32 status;
2386         int err;
2387         struct nfs4_acl *acl = NULL;
2388         void *context = NULL;
2389         int contextlen;
2390         bool contextsupport = false;
2391         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2392         u32 minorversion = resp->cstate.minorversion;
2393         struct path path = {
2394                 .mnt    = exp->ex_path.mnt,
2395                 .dentry = dentry,
2396         };
2397         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2398
2399         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2400         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2401
2402         if (exp->ex_fslocs.migrated) {
2403                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2404                 if (status)
2405                         goto out;
2406         }
2407
2408         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2409         if (err)
2410                 goto out_nfserr;
2411         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2412                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2413             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2414                        FATTR4_WORD1_SPACE_TOTAL))) {
2415                 err = vfs_statfs(&path, &statfs);
2416                 if (err)
2417                         goto out_nfserr;
2418         }
2419         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2420                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2421                 status = nfserr_jukebox;
2422                 if (!tempfh)
2423                         goto out;
2424                 fh_init(tempfh, NFS4_FHSIZE);
2425                 status = fh_compose(tempfh, exp, dentry, NULL);
2426                 if (status)
2427                         goto out;
2428                 fhp = tempfh;
2429         }
2430         if (bmval0 & FATTR4_WORD0_ACL) {
2431                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2432                 if (err == -EOPNOTSUPP)
2433                         bmval0 &= ~FATTR4_WORD0_ACL;
2434                 else if (err == -EINVAL) {
2435                         status = nfserr_attrnotsupp;
2436                         goto out;
2437                 } else if (err != 0)
2438                         goto out_nfserr;
2439         }
2440
2441 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2442         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2443              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2444                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2445                         err = security_inode_getsecctx(d_inode(dentry),
2446                                                 &context, &contextlen);
2447                 else
2448                         err = -EOPNOTSUPP;
2449                 contextsupport = (err == 0);
2450                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2451                         if (err == -EOPNOTSUPP)
2452                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2453                         else if (err)
2454                                 goto out_nfserr;
2455                 }
2456         }
2457 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2458
2459         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2460         if (status)
2461                 goto out;
2462
2463         attrlen_offset = xdr->buf->len;
2464         p = xdr_reserve_space(xdr, 4);
2465         if (!p)
2466                 goto out_resource;
2467         p++;                /* to be backfilled later */
2468
2469         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2470                 u32 supp[3];
2471
2472                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2473
2474                 if (!IS_POSIXACL(dentry->d_inode))
2475                         supp[0] &= ~FATTR4_WORD0_ACL;
2476                 if (!contextsupport)
2477                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2478                 if (!supp[2]) {
2479                         p = xdr_reserve_space(xdr, 12);
2480                         if (!p)
2481                                 goto out_resource;
2482                         *p++ = cpu_to_be32(2);
2483                         *p++ = cpu_to_be32(supp[0]);
2484                         *p++ = cpu_to_be32(supp[1]);
2485                 } else {
2486                         p = xdr_reserve_space(xdr, 16);
2487                         if (!p)
2488                                 goto out_resource;
2489                         *p++ = cpu_to_be32(3);
2490                         *p++ = cpu_to_be32(supp[0]);
2491                         *p++ = cpu_to_be32(supp[1]);
2492                         *p++ = cpu_to_be32(supp[2]);
2493                 }
2494         }
2495         if (bmval0 & FATTR4_WORD0_TYPE) {
2496                 p = xdr_reserve_space(xdr, 4);
2497                 if (!p)
2498                         goto out_resource;
2499                 dummy = nfs4_file_type(stat.mode);
2500                 if (dummy == NF4BAD) {
2501                         status = nfserr_serverfault;
2502                         goto out;
2503                 }
2504                 *p++ = cpu_to_be32(dummy);
2505         }
2506         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2507                 p = xdr_reserve_space(xdr, 4);
2508                 if (!p)
2509                         goto out_resource;
2510                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2511                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2512                 else
2513                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2514                                                 NFS4_FH_VOL_RENAME);
2515         }
2516         if (bmval0 & FATTR4_WORD0_CHANGE) {
2517                 p = xdr_reserve_space(xdr, 8);
2518                 if (!p)
2519                         goto out_resource;
2520                 p = encode_change(p, &stat, d_inode(dentry), exp);
2521         }
2522         if (bmval0 & FATTR4_WORD0_SIZE) {
2523                 p = xdr_reserve_space(xdr, 8);
2524                 if (!p)
2525                         goto out_resource;
2526                 p = xdr_encode_hyper(p, stat.size);
2527         }
2528         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2529                 p = xdr_reserve_space(xdr, 4);
2530                 if (!p)
2531                         goto out_resource;
2532                 *p++ = cpu_to_be32(1);
2533         }
2534         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2535                 p = xdr_reserve_space(xdr, 4);
2536                 if (!p)
2537                         goto out_resource;
2538                 *p++ = cpu_to_be32(1);
2539         }
2540         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2541                 p = xdr_reserve_space(xdr, 4);
2542                 if (!p)
2543                         goto out_resource;
2544                 *p++ = cpu_to_be32(0);
2545         }
2546         if (bmval0 & FATTR4_WORD0_FSID) {
2547                 p = xdr_reserve_space(xdr, 16);
2548                 if (!p)
2549                         goto out_resource;
2550                 if (exp->ex_fslocs.migrated) {
2551                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2552                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2553                 } else switch(fsid_source(fhp)) {
2554                 case FSIDSOURCE_FSID:
2555                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2556                         p = xdr_encode_hyper(p, (u64)0);
2557                         break;
2558                 case FSIDSOURCE_DEV:
2559                         *p++ = cpu_to_be32(0);
2560                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2561                         *p++ = cpu_to_be32(0);
2562                         *p++ = cpu_to_be32(MINOR(stat.dev));
2563                         break;
2564                 case FSIDSOURCE_UUID:
2565                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2566                                                                 EX_UUID_LEN);
2567                         break;
2568                 }
2569         }
2570         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2571                 p = xdr_reserve_space(xdr, 4);
2572                 if (!p)
2573                         goto out_resource;
2574                 *p++ = cpu_to_be32(0);
2575         }
2576         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2577                 p = xdr_reserve_space(xdr, 4);
2578                 if (!p)
2579                         goto out_resource;
2580                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2581         }
2582         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2583                 p = xdr_reserve_space(xdr, 4);
2584                 if (!p)
2585                         goto out_resource;
2586                 *p++ = cpu_to_be32(rdattr_err);
2587         }
2588         if (bmval0 & FATTR4_WORD0_ACL) {
2589                 struct nfs4_ace *ace;
2590
2591                 if (acl == NULL) {
2592                         p = xdr_reserve_space(xdr, 4);
2593                         if (!p)
2594                                 goto out_resource;
2595
2596                         *p++ = cpu_to_be32(0);
2597                         goto out_acl;
2598                 }
2599                 p = xdr_reserve_space(xdr, 4);
2600                 if (!p)
2601                         goto out_resource;
2602                 *p++ = cpu_to_be32(acl->naces);
2603
2604                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2605                         p = xdr_reserve_space(xdr, 4*3);
2606                         if (!p)
2607                                 goto out_resource;
2608                         *p++ = cpu_to_be32(ace->type);
2609                         *p++ = cpu_to_be32(ace->flag);
2610                         *p++ = cpu_to_be32(ace->access_mask &
2611                                                         NFS4_ACE_MASK_ALL);
2612                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2613                         if (status)
2614                                 goto out;
2615                 }
2616         }
2617 out_acl:
2618         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2619                 p = xdr_reserve_space(xdr, 4);
2620                 if (!p)
2621                         goto out_resource;
2622                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2623                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2624         }
2625         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2626                 p = xdr_reserve_space(xdr, 4);
2627                 if (!p)
2628                         goto out_resource;
2629                 *p++ = cpu_to_be32(1);
2630         }
2631         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2632                 p = xdr_reserve_space(xdr, 4);
2633                 if (!p)
2634                         goto out_resource;
2635                 *p++ = cpu_to_be32(0);
2636         }
2637         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2638                 p = xdr_reserve_space(xdr, 4);
2639                 if (!p)
2640                         goto out_resource;
2641                 *p++ = cpu_to_be32(1);
2642         }
2643         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2644                 p = xdr_reserve_space(xdr, 4);
2645                 if (!p)
2646                         goto out_resource;
2647                 *p++ = cpu_to_be32(1);
2648         }
2649         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2650                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2651                 if (!p)
2652                         goto out_resource;
2653                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2654                                         fhp->fh_handle.fh_size);
2655         }
2656         if (bmval0 & FATTR4_WORD0_FILEID) {
2657                 p = xdr_reserve_space(xdr, 8);
2658                 if (!p)
2659                         goto out_resource;
2660                 p = xdr_encode_hyper(p, stat.ino);
2661         }
2662         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2663                 p = xdr_reserve_space(xdr, 8);
2664                 if (!p)
2665                         goto out_resource;
2666                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2667         }
2668         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2669                 p = xdr_reserve_space(xdr, 8);
2670                 if (!p)
2671                         goto out_resource;
2672                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2673         }
2674         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2675                 p = xdr_reserve_space(xdr, 8);
2676                 if (!p)
2677                         goto out_resource;
2678                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2679         }
2680         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2681                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2682                 if (status)
2683                         goto out;
2684         }
2685         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2686                 p = xdr_reserve_space(xdr, 4);
2687                 if (!p)
2688                         goto out_resource;
2689                 *p++ = cpu_to_be32(1);
2690         }
2691         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2692                 p = xdr_reserve_space(xdr, 8);
2693                 if (!p)
2694                         goto out_resource;
2695                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2696         }
2697         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2698                 p = xdr_reserve_space(xdr, 4);
2699                 if (!p)
2700                         goto out_resource;
2701                 *p++ = cpu_to_be32(255);
2702         }
2703         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2704                 p = xdr_reserve_space(xdr, 4);
2705                 if (!p)
2706                         goto out_resource;
2707                 *p++ = cpu_to_be32(statfs.f_namelen);
2708         }
2709         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2710                 p = xdr_reserve_space(xdr, 8);
2711                 if (!p)
2712                         goto out_resource;
2713                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2714         }
2715         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2716                 p = xdr_reserve_space(xdr, 8);
2717                 if (!p)
2718                         goto out_resource;
2719                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2720         }
2721         if (bmval1 & FATTR4_WORD1_MODE) {
2722                 p = xdr_reserve_space(xdr, 4);
2723                 if (!p)
2724                         goto out_resource;
2725                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2726         }
2727         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2728                 p = xdr_reserve_space(xdr, 4);
2729                 if (!p)
2730                         goto out_resource;
2731                 *p++ = cpu_to_be32(1);
2732         }
2733         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2734                 p = xdr_reserve_space(xdr, 4);
2735                 if (!p)
2736                         goto out_resource;
2737                 *p++ = cpu_to_be32(stat.nlink);
2738         }
2739         if (bmval1 & FATTR4_WORD1_OWNER) {
2740                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2741                 if (status)
2742                         goto out;
2743         }
2744         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2745                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2746                 if (status)
2747                         goto out;
2748         }
2749         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2750                 p = xdr_reserve_space(xdr, 8);
2751                 if (!p)
2752                         goto out_resource;
2753                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2754                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2755         }
2756         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2757                 p = xdr_reserve_space(xdr, 8);
2758                 if (!p)
2759                         goto out_resource;
2760                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2761                 p = xdr_encode_hyper(p, dummy64);
2762         }
2763         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2764                 p = xdr_reserve_space(xdr, 8);
2765                 if (!p)
2766                         goto out_resource;
2767                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2768                 p = xdr_encode_hyper(p, dummy64);
2769         }
2770         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2771                 p = xdr_reserve_space(xdr, 8);
2772                 if (!p)
2773                         goto out_resource;
2774                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2775                 p = xdr_encode_hyper(p, dummy64);
2776         }
2777         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2778                 p = xdr_reserve_space(xdr, 8);
2779                 if (!p)
2780                         goto out_resource;
2781                 dummy64 = (u64)stat.blocks << 9;
2782                 p = xdr_encode_hyper(p, dummy64);
2783         }
2784         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2785                 p = xdr_reserve_space(xdr, 12);
2786                 if (!p)
2787                         goto out_resource;
2788                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2789                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2790         }
2791         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2792                 p = xdr_reserve_space(xdr, 12);
2793                 if (!p)
2794                         goto out_resource;
2795                 *p++ = cpu_to_be32(0);
2796                 *p++ = cpu_to_be32(1);
2797                 *p++ = cpu_to_be32(0);
2798         }
2799         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2800                 p = xdr_reserve_space(xdr, 12);
2801                 if (!p)
2802                         goto out_resource;
2803                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2804                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2805         }
2806         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2807                 p = xdr_reserve_space(xdr, 12);
2808                 if (!p)
2809                         goto out_resource;
2810                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2811                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2812         }
2813         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2814                 struct kstat parent_stat;
2815                 u64 ino = stat.ino;
2816
2817                 p = xdr_reserve_space(xdr, 8);
2818                 if (!p)
2819                         goto out_resource;
2820                 /*
2821                  * Get parent's attributes if not ignoring crossmount
2822                  * and this is the root of a cross-mounted filesystem.
2823                  */
2824                 if (ignore_crossmnt == 0 &&
2825                     dentry == exp->ex_path.mnt->mnt_root) {
2826                         err = get_parent_attributes(exp, &parent_stat);
2827                         if (err)
2828                                 goto out_nfserr;
2829                         ino = parent_stat.ino;
2830                 }
2831                 p = xdr_encode_hyper(p, ino);
2832         }
2833 #ifdef CONFIG_NFSD_PNFS
2834         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2835                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2836                 if (status)
2837                         goto out;
2838         }
2839
2840         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2841                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2842                 if (status)
2843                         goto out;
2844         }
2845
2846         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2847                 p = xdr_reserve_space(xdr, 4);
2848                 if (!p)
2849                         goto out_resource;
2850                 *p++ = cpu_to_be32(stat.blksize);
2851         }
2852 #endif /* CONFIG_NFSD_PNFS */
2853         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2854                 u32 supp[3];
2855
2856                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2857                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2858                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2859                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2860
2861                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2862                 if (status)
2863                         goto out;
2864         }
2865
2866         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2867                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2868                                                                 contextlen);
2869                 if (status)
2870                         goto out;
2871         }
2872
2873         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2874         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2875         status = nfs_ok;
2876
2877 out:
2878 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2879         if (context)
2880                 security_release_secctx(context, contextlen);
2881 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2882         kfree(acl);
2883         if (tempfh) {
2884                 fh_put(tempfh);
2885                 kfree(tempfh);
2886         }
2887         if (status)
2888                 xdr_truncate_encode(xdr, starting_len);
2889         return status;
2890 out_nfserr:
2891         status = nfserrno(err);
2892         goto out;
2893 out_resource:
2894         status = nfserr_resource;
2895         goto out;
2896 }
2897
2898 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2899                                 struct xdr_buf *buf, __be32 *p, int bytes)
2900 {
2901         xdr->scratch.iov_len = 0;
2902         memset(buf, 0, sizeof(struct xdr_buf));
2903         buf->head[0].iov_base = p;
2904         buf->head[0].iov_len = 0;
2905         buf->len = 0;
2906         xdr->buf = buf;
2907         xdr->iov = buf->head;
2908         xdr->p = p;
2909         xdr->end = (void *)p + bytes;
2910         buf->buflen = bytes;
2911 }
2912
2913 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2914                         struct svc_fh *fhp, struct svc_export *exp,
2915                         struct dentry *dentry, u32 *bmval,
2916                         struct svc_rqst *rqstp, int ignore_crossmnt)
2917 {
2918         struct xdr_buf dummy;
2919         struct xdr_stream xdr;
2920         __be32 ret;
2921
2922         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2923         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2924                                                         ignore_crossmnt);
2925         *p = xdr.p;
2926         return ret;
2927 }
2928
2929 static inline int attributes_need_mount(u32 *bmval)
2930 {
2931         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2932                 return 1;
2933         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2934                 return 1;
2935         return 0;
2936 }
2937
2938 static __be32
2939 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2940                         const char *name, int namlen)
2941 {
2942         struct svc_export *exp = cd->rd_fhp->fh_export;
2943         struct dentry *dentry;
2944         __be32 nfserr;
2945         int ignore_crossmnt = 0;
2946
2947         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2948         if (IS_ERR(dentry))
2949                 return nfserrno(PTR_ERR(dentry));
2950         if (d_really_is_negative(dentry)) {
2951                 /*
2952                  * we're not holding the i_mutex here, so there's
2953                  * a window where this directory entry could have gone
2954                  * away.
2955                  */
2956                 dput(dentry);
2957                 return nfserr_noent;
2958         }
2959
2960         exp_get(exp);
2961         /*
2962          * In the case of a mountpoint, the client may be asking for
2963          * attributes that are only properties of the underlying filesystem
2964          * as opposed to the cross-mounted file system. In such a case,
2965          * we will not follow the cross mount and will fill the attribtutes
2966          * directly from the mountpoint dentry.
2967          */
2968         if (nfsd_mountpoint(dentry, exp)) {
2969                 int err;
2970
2971                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2972                                 && !attributes_need_mount(cd->rd_bmval)) {
2973                         ignore_crossmnt = 1;
2974                         goto out_encode;
2975                 }
2976                 /*
2977                  * Why the heck aren't we just using nfsd_lookup??
2978                  * Different "."/".." handling?  Something else?
2979                  * At least, add a comment here to explain....
2980                  */
2981                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2982                 if (err) {
2983                         nfserr = nfserrno(err);
2984                         goto out_put;
2985                 }
2986                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2987                 if (nfserr)
2988                         goto out_put;
2989
2990         }
2991 out_encode:
2992         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2993                                         cd->rd_rqstp, ignore_crossmnt);
2994 out_put:
2995         dput(dentry);
2996         exp_put(exp);
2997         return nfserr;
2998 }
2999
3000 static __be32 *
3001 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3002 {
3003         __be32 *p;
3004
3005         p = xdr_reserve_space(xdr, 20);
3006         if (!p)
3007                 return NULL;
3008         *p++ = htonl(2);
3009         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3010         *p++ = htonl(0);                         /* bmval1 */
3011
3012         *p++ = htonl(4);     /* attribute length */
3013         *p++ = nfserr;       /* no htonl */
3014         return p;
3015 }
3016
3017 static int
3018 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3019                     loff_t offset, u64 ino, unsigned int d_type)
3020 {
3021         struct readdir_cd *ccd = ccdv;
3022         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3023         struct xdr_stream *xdr = cd->xdr;
3024         int start_offset = xdr->buf->len;
3025         int cookie_offset;
3026         u32 name_and_cookie;
3027         int entry_bytes;
3028         __be32 nfserr = nfserr_toosmall;
3029         __be64 wire_offset;
3030         __be32 *p;
3031
3032         /* In nfsv4, "." and ".." never make it onto the wire.. */
3033         if (name && isdotent(name, namlen)) {
3034                 cd->common.err = nfs_ok;
3035                 return 0;
3036         }
3037
3038         if (cd->cookie_offset) {
3039                 wire_offset = cpu_to_be64(offset);
3040                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3041                                                         &wire_offset, 8);
3042         }
3043
3044         p = xdr_reserve_space(xdr, 4);
3045         if (!p)
3046                 goto fail;
3047         *p++ = xdr_one;                             /* mark entry present */
3048         cookie_offset = xdr->buf->len;
3049         p = xdr_reserve_space(xdr, 3*4 + namlen);
3050         if (!p)
3051                 goto fail;
3052         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3053         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3054
3055         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3056         switch (nfserr) {
3057         case nfs_ok:
3058                 break;
3059         case nfserr_resource:
3060                 nfserr = nfserr_toosmall;
3061                 goto fail;
3062         case nfserr_noent:
3063                 xdr_truncate_encode(xdr, start_offset);
3064                 goto skip_entry;
3065         default:
3066                 /*
3067                  * If the client requested the RDATTR_ERROR attribute,
3068                  * we stuff the error code into this attribute
3069                  * and continue.  If this attribute was not requested,
3070                  * then in accordance with the spec, we fail the
3071                  * entire READDIR operation(!)
3072                  */
3073                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3074                         goto fail;
3075                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3076                 if (p == NULL) {
3077                         nfserr = nfserr_toosmall;
3078                         goto fail;
3079                 }
3080         }
3081         nfserr = nfserr_toosmall;
3082         entry_bytes = xdr->buf->len - start_offset;
3083         if (entry_bytes > cd->rd_maxcount)
3084                 goto fail;
3085         cd->rd_maxcount -= entry_bytes;
3086         /*
3087          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3088          * let's always let through the first entry, at least:
3089          */
3090         if (!cd->rd_dircount)
3091                 goto fail;
3092         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3093         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3094                 goto fail;
3095         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3096
3097         cd->cookie_offset = cookie_offset;
3098 skip_entry:
3099         cd->common.err = nfs_ok;
3100         return 0;
3101 fail:
3102         xdr_truncate_encode(xdr, start_offset);
3103         cd->common.err = nfserr;
3104         return -EINVAL;
3105 }
3106
3107 static __be32
3108 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3109 {
3110         __be32 *p;
3111
3112         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3113         if (!p)
3114                 return nfserr_resource;
3115         *p++ = cpu_to_be32(sid->si_generation);
3116         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3117                                         sizeof(stateid_opaque_t));
3118         return 0;
3119 }
3120
3121 static __be32
3122 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3123 {
3124         struct xdr_stream *xdr = &resp->xdr;
3125         __be32 *p;
3126
3127         p = xdr_reserve_space(xdr, 8);
3128         if (!p)
3129                 return nfserr_resource;
3130         *p++ = cpu_to_be32(access->ac_supported);
3131         *p++ = cpu_to_be32(access->ac_resp_access);
3132         return 0;
3133 }
3134
3135 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3136 {
3137         struct xdr_stream *xdr = &resp->xdr;
3138         __be32 *p;
3139
3140         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3141         if (!p)
3142                 return nfserr_resource;
3143         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3144                                         NFS4_MAX_SESSIONID_LEN);
3145         *p++ = cpu_to_be32(bcts->dir);
3146         /* Upshifting from TCP to RDMA is not supported */
3147         *p++ = cpu_to_be32(0);
3148         return 0;
3149 }
3150
3151 static __be32
3152 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3153 {
3154         struct xdr_stream *xdr = &resp->xdr;
3155
3156         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3157 }
3158
3159
3160 static __be32
3161 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3162 {
3163         struct xdr_stream *xdr = &resp->xdr;
3164         __be32 *p;
3165
3166         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3167         if (!p)
3168                 return nfserr_resource;
3169         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3170                                                 NFS4_VERIFIER_SIZE);
3171         return 0;
3172 }
3173
3174 static __be32
3175 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3176 {
3177         struct xdr_stream *xdr = &resp->xdr;
3178         __be32 *p;
3179
3180         p = xdr_reserve_space(xdr, 20);
3181         if (!p)
3182                 return nfserr_resource;
3183         encode_cinfo(p, &create->cr_cinfo);
3184         nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3185                         create->cr_bmval[1], create->cr_bmval[2]);
3186         return 0;
3187 }
3188
3189 static __be32
3190 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3191 {
3192         struct svc_fh *fhp = getattr->ga_fhp;
3193         struct xdr_stream *xdr = &resp->xdr;
3194
3195         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3196                                     getattr->ga_bmval, resp->rqstp, 0);
3197 }
3198
3199 static __be32
3200 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3201 {
3202         struct xdr_stream *xdr = &resp->xdr;
3203         struct svc_fh *fhp = *fhpp;
3204         unsigned int len;
3205         __be32 *p;
3206
3207         len = fhp->fh_handle.fh_size;
3208         p = xdr_reserve_space(xdr, len + 4);
3209         if (!p)
3210                 return nfserr_resource;
3211         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3212         return 0;
3213 }
3214
3215 /*
3216 * Including all fields other than the name, a LOCK4denied structure requires
3217 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3218 */
3219 static __be32
3220 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3221 {
3222         struct xdr_netobj *conf = &ld->ld_owner;
3223         __be32 *p;
3224
3225 again:
3226         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3227         if (!p) {
3228                 /*
3229                  * Don't fail to return the result just because we can't
3230                  * return the conflicting open:
3231                  */
3232                 if (conf->len) {
3233                         kfree(conf->data);
3234                         conf->len = 0;
3235                         conf->data = NULL;
3236                         goto again;
3237                 }
3238                 return nfserr_resource;
3239         }
3240         p = xdr_encode_hyper(p, ld->ld_start);
3241         p = xdr_encode_hyper(p, ld->ld_length);
3242         *p++ = cpu_to_be32(ld->ld_type);
3243         if (conf->len) {
3244                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3245                 p = xdr_encode_opaque(p, conf->data, conf->len);
3246                 kfree(conf->data);
3247         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3248                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3249                 *p++ = cpu_to_be32(0); /* length of owner name */
3250         }
3251         return nfserr_denied;
3252 }
3253
3254 static __be32
3255 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3256 {
3257         struct xdr_stream *xdr = &resp->xdr;
3258
3259         if (!nfserr)
3260                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3261         else if (nfserr == nfserr_denied)
3262                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3263
3264         return nfserr;
3265 }
3266
3267 static __be32
3268 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3269 {
3270         struct xdr_stream *xdr = &resp->xdr;
3271
3272         if (nfserr == nfserr_denied)
3273                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3274         return nfserr;
3275 }
3276
3277 static __be32
3278 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3279 {
3280         struct xdr_stream *xdr = &resp->xdr;
3281
3282         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3283 }
3284
3285
3286 static __be32
3287 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3288 {
3289         struct xdr_stream *xdr = &resp->xdr;
3290         __be32 *p;
3291
3292         p = xdr_reserve_space(xdr, 20);
3293         if (!p)
3294                 return nfserr_resource;
3295         p = encode_cinfo(p, &link->li_cinfo);
3296         return 0;
3297 }
3298
3299
3300 static __be32
3301 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3302 {
3303         struct xdr_stream *xdr = &resp->xdr;
3304         __be32 *p;
3305
3306         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3307         if (nfserr)
3308                 return nfserr;
3309         p = xdr_reserve_space(xdr, 24);
3310         if (!p)
3311                 return nfserr_resource;
3312         p = encode_cinfo(p, &open->op_cinfo);
3313         *p++ = cpu_to_be32(open->op_rflags);
3314
3315         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3316                                         open->op_bmval[2]);
3317         if (nfserr)
3318                 return nfserr;
3319
3320         p = xdr_reserve_space(xdr, 4);
3321         if (!p)
3322                 return nfserr_resource;
3323
3324         *p++ = cpu_to_be32(open->op_delegate_type);
3325         switch (open->op_delegate_type) {
3326         case NFS4_OPEN_DELEGATE_NONE:
3327                 break;
3328         case NFS4_OPEN_DELEGATE_READ:
3329                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3330                 if (nfserr)
3331                         return nfserr;
3332                 p = xdr_reserve_space(xdr, 20);
3333                 if (!p)
3334                         return nfserr_resource;
3335                 *p++ = cpu_to_be32(open->op_recall);
3336
3337                 /*
3338                  * TODO: ACE's in delegations
3339                  */
3340                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3341                 *p++ = cpu_to_be32(0);
3342                 *p++ = cpu_to_be32(0);
3343                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3344                 break;
3345         case NFS4_OPEN_DELEGATE_WRITE:
3346                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3347                 if (nfserr)
3348                         return nfserr;
3349                 p = xdr_reserve_space(xdr, 32);
3350                 if (!p)
3351                         return nfserr_resource;
3352                 *p++ = cpu_to_be32(0);
3353
3354                 /*
3355                  * TODO: space_limit's in delegations
3356                  */
3357                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3358                 *p++ = cpu_to_be32(~(u32)0);
3359                 *p++ = cpu_to_be32(~(u32)0);
3360
3361                 /*
3362                  * TODO: ACE's in delegations
3363                  */
3364                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3365                 *p++ = cpu_to_be32(0);
3366                 *p++ = cpu_to_be32(0);
3367                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3368                 break;
3369         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3370                 switch (open->op_why_no_deleg) {
3371                 case WND4_CONTENTION:
3372                 case WND4_RESOURCE:
3373                         p = xdr_reserve_space(xdr, 8);
3374                         if (!p)
3375                                 return nfserr_resource;
3376                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3377                         /* deleg signaling not supported yet: */
3378                         *p++ = cpu_to_be32(0);
3379                         break;
3380                 default:
3381                         p = xdr_reserve_space(xdr, 4);
3382                         if (!p)
3383                                 return nfserr_resource;
3384                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3385                 }
3386                 break;
3387         default:
3388                 BUG();
3389         }
3390         /* XXX save filehandle here */
3391         return 0;
3392 }
3393
3394 static __be32
3395 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3396 {
3397         struct xdr_stream *xdr = &resp->xdr;
3398
3399         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3400 }
3401
3402 static __be32
3403 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3404 {
3405         struct xdr_stream *xdr = &resp->xdr;
3406
3407         return nfsd4_encode_stateid(xdr, &od->od_stateid);
3408 }
3409
3410 static __be32 nfsd4_encode_splice_read(
3411                                 struct nfsd4_compoundres *resp,
3412                                 struct nfsd4_read *read,
3413                                 struct file *file, unsigned long maxcount)
3414 {
3415         struct xdr_stream *xdr = &resp->xdr;
3416         struct xdr_buf *buf = xdr->buf;
3417         u32 eof;
3418         long len;
3419         int space_left;
3420         __be32 nfserr;
3421         __be32 *p = xdr->p - 2;
3422
3423         /* Make sure there will be room for padding if needed */
3424         if (xdr->end - xdr->p < 1)
3425                 return nfserr_resource;
3426
3427         len = maxcount;
3428         nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3429                                   file, read->rd_offset, &maxcount);
3430         read->rd_length = 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(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3514                             resp->rqstp->rq_vec, read->rd_vlen, &maxcount);
3515         read->rd_length = maxcount;
3516         if (nfserr)
3517                 return nfserr;
3518         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3519
3520         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3521                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3522
3523         tmp = htonl(eof);
3524         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3525         tmp = htonl(maxcount);
3526         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3527
3528         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3529         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3530                                                                 &zzz, pad);
3531         return 0;
3532
3533 }
3534
3535 static __be32
3536 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3537                   struct nfsd4_read *read)
3538 {
3539         unsigned long maxcount;
3540         struct xdr_stream *xdr = &resp->xdr;
3541         struct file *file = read->rd_filp;
3542         int starting_len = xdr->buf->len;
3543         struct raparms *ra = NULL;
3544         __be32 *p;
3545
3546         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3547         if (!p) {
3548                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3549                 return nfserr_resource;
3550         }
3551         if (resp->xdr.buf->page_len &&
3552             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3553                 WARN_ON_ONCE(1);
3554                 return nfserr_resource;
3555         }
3556         xdr_commit_encode(xdr);
3557
3558         maxcount = svc_max_payload(resp->rqstp);
3559         maxcount = min_t(unsigned long, maxcount,
3560                          (xdr->buf->buflen - xdr->buf->len));
3561         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3562
3563         if (read->rd_tmp_file)
3564                 ra = nfsd_init_raparms(file);
3565
3566         if (file->f_op->splice_read &&
3567             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3568                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3569         else
3570                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3571
3572         if (ra)
3573                 nfsd_put_raparams(file, ra);
3574
3575         if (nfserr)
3576                 xdr_truncate_encode(xdr, starting_len);
3577
3578         return nfserr;
3579 }
3580
3581 static __be32
3582 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3583 {
3584         int maxcount;
3585         __be32 wire_count;
3586         int zero = 0;
3587         struct xdr_stream *xdr = &resp->xdr;
3588         int length_offset = xdr->buf->len;
3589         __be32 *p;
3590
3591         p = xdr_reserve_space(xdr, 4);
3592         if (!p)
3593                 return nfserr_resource;
3594         maxcount = PAGE_SIZE;
3595
3596         p = xdr_reserve_space(xdr, maxcount);
3597         if (!p)
3598                 return nfserr_resource;
3599         /*
3600          * XXX: By default, vfs_readlink() will truncate symlinks if they
3601          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
3602          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3603          * that truncation occurred, and return NFS4ERR_RESOURCE.
3604          */
3605         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3606                                                 (char *)p, &maxcount);
3607         if (nfserr == nfserr_isdir)
3608                 nfserr = nfserr_inval;
3609         if (nfserr) {
3610                 xdr_truncate_encode(xdr, length_offset);
3611                 return nfserr;
3612         }
3613
3614         wire_count = htonl(maxcount);
3615         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3616         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3617         if (maxcount & 3)
3618                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3619                                                 &zero, 4 - (maxcount&3));
3620         return 0;
3621 }
3622
3623 static __be32
3624 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3625 {
3626         int maxcount;
3627         int bytes_left;
3628         loff_t offset;
3629         __be64 wire_offset;
3630         struct xdr_stream *xdr = &resp->xdr;
3631         int starting_len = xdr->buf->len;
3632         __be32 *p;
3633
3634         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3635         if (!p)
3636                 return nfserr_resource;
3637
3638         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3639         *p++ = cpu_to_be32(0);
3640         *p++ = cpu_to_be32(0);
3641         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3642                                 - (char *)resp->xdr.buf->head[0].iov_base;
3643
3644         /*
3645          * Number of bytes left for directory entries allowing for the
3646          * final 8 bytes of the readdir and a following failed op:
3647          */
3648         bytes_left = xdr->buf->buflen - xdr->buf->len
3649                         - COMPOUND_ERR_SLACK_SPACE - 8;
3650         if (bytes_left < 0) {
3651                 nfserr = nfserr_resource;
3652                 goto err_no_verf;
3653         }
3654         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
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 = INT_MAX;
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++ = xdr_one; /* cr_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  */