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/fs_struct.h>
  37 #include <linux/file.h>
  38 #include <linux/slab.h>
  39 #include <linux/namei.h>
  40 #include <linux/statfs.h>
  41 #include <linux/utsname.h>
  42 #include <linux/pagemap.h>
  43 #include <linux/sunrpc/svcauth_gss.h>
  44
  45 #include "idmap.h"
  46 #include "acl.h"
  47 #include "xdr4.h"
  48 #include "vfs.h"
  49 #include "state.h"
  50 #include "cache.h"
  51 #include "netns.h"
  52 #include "pnfs.h"
  53
  54 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  55 #include <linux/security.h>
  56 #endif
  57
  58
  59 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  60
  61 u32 nfsd_suppattrs[3][3] = {
  62         {NFSD4_SUPPORTED_ATTRS_WORD0,
  63          NFSD4_SUPPORTED_ATTRS_WORD1,
  64          NFSD4_SUPPORTED_ATTRS_WORD2},
  65
  66         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  67          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  68          NFSD4_1_SUPPORTED_ATTRS_WORD2},
  69
  70         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  71          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  72          NFSD4_2_SUPPORTED_ATTRS_WORD2},
  73 };
  74
  75 /*
  76  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  77  * directory in order to indicate to the client that a filesystem boundary is present
  78  * We use a fixed fsid for a referral
  79  */
  80 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  81 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  82
  83 static __be32
  84 check_filename(char *str, int len)
  85 {
  86         int i;
  87
  88         if (len == 0)
  89                 return nfserr_inval;
  90         if (isdotent(str, len))
  91                 return nfserr_badname;
  92         for (i = 0; i < len; i++)
  93                 if (str[i] == '/')
  94                         return nfserr_badname;
  95         return 0;
  96 }
  97
  98 #define DECODE_HEAD                             \
  99         __be32 *p;                              \
 100         __be32 status
 101 #define DECODE_TAIL                             \
 102         status = 0;                             \
 103 out:                                            \
 104         return status;                          \
 105 xdr_error:                                      \
 106         dprintk("NFSD: xdr error (%s:%d)\n",    \
 107                         __FILE__, __LINE__);    \
 108         status = nfserr_bad_xdr;                \
 109         goto out
 110
 111 #define READMEM(x,nbytes) do {                  \
 112         x = (char *)p;                          \
 113         p += XDR_QUADLEN(nbytes);               \
 114 } while (0)
 115 #define SAVEMEM(x,nbytes) do {                  \
 116         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 117                 savemem(argp, p, nbytes) :      \
 118                 (char *)p)) {                   \
 119                 dprintk("NFSD: xdr error (%s:%d)\n", \
 120                                 __FILE__, __LINE__); \
 121                 goto xdr_error;                 \
 122                 }                               \
 123         p += XDR_QUADLEN(nbytes);               \
 124 } while (0)
 125 #define COPYMEM(x,nbytes) do {                  \
 126         memcpy((x), p, nbytes);                 \
 127         p += XDR_QUADLEN(nbytes);               \
 128 } while (0)
 129
 130 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 131 #define READ_BUF(nbytes)  do {                  \
 132         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 133                 p = argp->p;                    \
 134                 argp->p += XDR_QUADLEN(nbytes); \
 135         } else if (!(p = read_buf(argp, nbytes))) { \
 136                 dprintk("NFSD: xdr error (%s:%d)\n", \
 137                                 __FILE__, __LINE__); \
 138                 goto xdr_error;                 \
 139         }                                       \
 140 } while (0)
 141
 142 static void next_decode_page(struct nfsd4_compoundargs *argp)
 143 {
 144         argp->p = page_address(argp->pagelist[0]);
 145         argp->pagelist++;
 146         if (argp->pagelen < PAGE_SIZE) {
 147                 argp->end = argp->p + (argp->pagelen>>2);
 148                 argp->pagelen = 0;
 149         } else {
 150                 argp->end = argp->p + (PAGE_SIZE>>2);
 151                 argp->pagelen -= PAGE_SIZE;
 152         }
 153 }
 154
 155 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 156 {
 157         /* We want more bytes than seem to be available.
 158          * Maybe we need a new page, maybe we have just run out
 159          */
 160         unsigned int avail = (char *)argp->end - (char *)argp->p;
 161         __be32 *p;
 162         if (avail + argp->pagelen < nbytes)
 163                 return NULL;
 164         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 165                 return NULL;
 166         /* ok, we can do it with the current plus the next page */
 167         if (nbytes <= sizeof(argp->tmp))
 168                 p = argp->tmp;
 169         else {
 170                 kfree(argp->tmpp);
 171                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 172                 if (!p)
 173                         return NULL;
 174
 175         }
 176         /*
 177          * The following memcpy is safe because read_buf is always
 178          * called with nbytes > avail, and the two cases above both
 179          * guarantee p points to at least nbytes bytes.
 180          */
 181         memcpy(p, argp->p, avail);
 182         next_decode_page(argp);
 183         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 184         argp->p += XDR_QUADLEN(nbytes - avail);
 185         return p;
 186 }
 187
 188 static int zero_clientid(clientid_t *clid)
 189 {
 190         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 191 }
 192
 193 /**
 194  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 195  * @argp: NFSv4 compound argument structure
 196  * @p: pointer to be freed (with kfree())
 197  *
 198  * Marks @p to be freed when processing the compound operation
 199  * described in @argp finishes.
 200  */
 201 static void *
 202 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 203 {
 204         struct svcxdr_tmpbuf *tb;
 205
 206         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 207         if (!tb)
 208                 return NULL;
 209         tb->next = argp->to_free;
 210         argp->to_free = tb;
 211         return tb->buf;
 212 }
 213
 214 /*
 215  * For xdr strings that need to be passed to other kernel api's
 216  * as null-terminated strings.
 217  *
 218  * Note null-terminating in place usually isn't safe since the
 219  * buffer might end on a page boundary.
 220  */
 221 static char *
 222 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 223 {
 224         char *p = svcxdr_tmpalloc(argp, len + 1);
 225
 226         if (!p)
 227                 return NULL;
 228         memcpy(p, buf, len);
 229         p[len] = '\0';
 230         return p;
 231 }
 232
 233 /**
 234  * savemem - duplicate a chunk of memory for later processing
 235  * @argp: NFSv4 compound argument structure to be freed with
 236  * @p: pointer to be duplicated
 237  * @nbytes: length to be duplicated
 238  *
 239  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 240  * that are preserved until processing of the NFSv4 compound
 241  * operation described by @argp finishes.
 242  */
 243 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 244 {
 245         void *ret;
 246
 247         ret = svcxdr_tmpalloc(argp, nbytes);
 248         if (!ret)
 249                 return NULL;
 250         memcpy(ret, p, nbytes);
 251         return ret;
 252 }
 253
 254 /*
 255  * We require the high 32 bits of 'seconds' to be 0, and
 256  * we ignore all 32 bits of 'nseconds'.
 257  */
 258 static __be32
 259 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
 260 {
 261         DECODE_HEAD;
 262         u64 sec;
 263
 264         READ_BUF(12);
 265         p = xdr_decode_hyper(p, &sec);
 266         tv->tv_sec = sec;
 267         tv->tv_nsec = be32_to_cpup(p++);
 268         if (tv->tv_nsec >= (u32)1000000000)
 269                 return nfserr_inval;
 270
 271         DECODE_TAIL;
 272 }
 273
 274 static __be32
 275 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 276 {
 277         u32 bmlen;
 278         DECODE_HEAD;
 279
 280         bmval[0] = 0;
 281         bmval[1] = 0;
 282         bmval[2] = 0;
 283
 284         READ_BUF(4);
 285         bmlen = be32_to_cpup(p++);
 286         if (bmlen > 1000)
 287                 goto xdr_error;
 288
 289         READ_BUF(bmlen << 2);
 290         if (bmlen > 0)
 291                 bmval[0] = be32_to_cpup(p++);
 292         if (bmlen > 1)
 293                 bmval[1] = be32_to_cpup(p++);
 294         if (bmlen > 2)
 295                 bmval[2] = be32_to_cpup(p++);
 296
 297         DECODE_TAIL;
 298 }
 299
 300 static __be32
 301 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 302                    struct iattr *iattr, struct nfs4_acl **acl,
 303                    struct xdr_netobj *label, int *umask)
 304 {
 305         int expected_len, len = 0;
 306         u32 dummy32;
 307         char *buf;
 308
 309         DECODE_HEAD;
 310         iattr->ia_valid = 0;
 311         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 312                 return status;
 313
 314         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 315             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 316             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
 317                 if (nfsd_attrs_supported(argp->minorversion, bmval))
 318                         return nfserr_inval;
 319                 return nfserr_attrnotsupp;
 320         }
 321
 322         READ_BUF(4);
 323         expected_len = be32_to_cpup(p++);
 324
 325         if (bmval[0] & FATTR4_WORD0_SIZE) {
 326                 READ_BUF(8);
 327                 len += 8;
 328                 p = xdr_decode_hyper(p, &iattr->ia_size);
 329                 iattr->ia_valid |= ATTR_SIZE;
 330         }
 331         if (bmval[0] & FATTR4_WORD0_ACL) {
 332                 u32 nace;
 333                 struct nfs4_ace *ace;
 334
 335                 READ_BUF(4); len += 4;
 336                 nace = be32_to_cpup(p++);
 337
 338                 if (nace > NFS4_ACL_MAX)
 339                         return nfserr_fbig;
 340
 341                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
 342                 if (*acl == NULL)
 343                         return nfserr_jukebox;
 344
 345                 (*acl)->naces = nace;
 346                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 347                         READ_BUF(16); len += 16;
 348                         ace->type = be32_to_cpup(p++);
 349                         ace->flag = be32_to_cpup(p++);
 350                         ace->access_mask = be32_to_cpup(p++);
 351                         dummy32 = be32_to_cpup(p++);
 352                         READ_BUF(dummy32);
 353                         len += XDR_QUADLEN(dummy32) << 2;
 354                         READMEM(buf, dummy32);
 355                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 356                         status = nfs_ok;
 357                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 358                                 ;
 359                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 360                                 status = nfsd_map_name_to_gid(argp->rqstp,
 361                                                 buf, dummy32, &ace->who_gid);
 362                         else
 363                                 status = nfsd_map_name_to_uid(argp->rqstp,
 364                                                 buf, dummy32, &ace->who_uid);
 365                         if (status)
 366                                 return status;
 367                 }
 368         } else
 369                 *acl = NULL;
 370         if (bmval[1] & FATTR4_WORD1_MODE) {
 371                 READ_BUF(4);
 372                 len += 4;
 373                 iattr->ia_mode = be32_to_cpup(p++);
 374                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 375                 iattr->ia_valid |= ATTR_MODE;
 376         }
 377         if (bmval[1] & FATTR4_WORD1_OWNER) {
 378                 READ_BUF(4);
 379                 len += 4;
 380                 dummy32 = be32_to_cpup(p++);
 381                 READ_BUF(dummy32);
 382                 len += (XDR_QUADLEN(dummy32) << 2);
 383                 READMEM(buf, dummy32);
 384                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 385                         return status;
 386                 iattr->ia_valid |= ATTR_UID;
 387         }
 388         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 389                 READ_BUF(4);
 390                 len += 4;
 391                 dummy32 = be32_to_cpup(p++);
 392                 READ_BUF(dummy32);
 393                 len += (XDR_QUADLEN(dummy32) << 2);
 394                 READMEM(buf, dummy32);
 395                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 396                         return status;
 397                 iattr->ia_valid |= ATTR_GID;
 398         }
 399         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 400                 READ_BUF(4);
 401                 len += 4;
 402                 dummy32 = be32_to_cpup(p++);
 403                 switch (dummy32) {
 404                 case NFS4_SET_TO_CLIENT_TIME:
 405                         len += 12;
 406                         status = nfsd4_decode_time(argp, &iattr->ia_atime);
 407                         if (status)
 408                                 return status;
 409                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 410                         break;
 411                 case NFS4_SET_TO_SERVER_TIME:
 412                         iattr->ia_valid |= ATTR_ATIME;
 413                         break;
 414                 default:
 415                         goto xdr_error;
 416                 }
 417         }
 418         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 419                 READ_BUF(4);
 420                 len += 4;
 421                 dummy32 = be32_to_cpup(p++);
 422                 switch (dummy32) {
 423                 case NFS4_SET_TO_CLIENT_TIME:
 424                         len += 12;
 425                         status = nfsd4_decode_time(argp, &iattr->ia_mtime);
 426                         if (status)
 427                                 return status;
 428                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 429                         break;
 430                 case NFS4_SET_TO_SERVER_TIME:
 431                         iattr->ia_valid |= ATTR_MTIME;
 432                         break;
 433                 default:
 434                         goto xdr_error;
 435                 }
 436         }
 437
 438         label->len = 0;
 439 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 440         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 441                 READ_BUF(4);
 442                 len += 4;
 443                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 444                 READ_BUF(4);
 445                 len += 4;
 446                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 447                 READ_BUF(4);
 448                 len += 4;
 449                 dummy32 = be32_to_cpup(p++);
 450                 READ_BUF(dummy32);
 451                 if (dummy32 > NFS4_MAXLABELLEN)
 452                         return nfserr_badlabel;
 453                 len += (XDR_QUADLEN(dummy32) << 2);
 454                 READMEM(buf, dummy32);
 455                 label->len = dummy32;
 456                 label->data = svcxdr_dupstr(argp, buf, dummy32);
 457                 if (!label->data)
 458                         return nfserr_jukebox;
 459         }
 460 #endif
 461         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
 462                 if (!umask)
 463                         goto xdr_error;
 464                 READ_BUF(8);
 465                 len += 8;
 466                 dummy32 = be32_to_cpup(p++);
 467                 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
 468                 dummy32 = be32_to_cpup(p++);
 469                 *umask = dummy32 & S_IRWXUGO;
 470                 iattr->ia_valid |= ATTR_MODE;
 471         }
 472         if (len != expected_len)
 473                 goto xdr_error;
 474
 475         DECODE_TAIL;
 476 }
 477
 478 static __be32
 479 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 480 {
 481         DECODE_HEAD;
 482
 483         READ_BUF(sizeof(stateid_t));
 484         sid->si_generation = be32_to_cpup(p++);
 485         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 486
 487         DECODE_TAIL;
 488 }
 489
 490 static __be32
 491 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 492 {
 493         DECODE_HEAD;
 494
 495         READ_BUF(4);
 496         access->ac_req_access = be32_to_cpup(p++);
 497
 498         DECODE_TAIL;
 499 }
 500
 501 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 502 {
 503         DECODE_HEAD;
 504         u32 dummy, uid, gid;
 505         char *machine_name;
 506         int i;
 507         int nr_secflavs;
 508
 509         /* callback_sec_params4 */
 510         READ_BUF(4);
 511         nr_secflavs = be32_to_cpup(p++);
 512         if (nr_secflavs)
 513                 cbs->flavor = (u32)(-1);
 514         else
 515                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 516                 cbs->flavor = 0;
 517         for (i = 0; i < nr_secflavs; ++i) {
 518                 READ_BUF(4);
 519                 dummy = be32_to_cpup(p++);
 520                 switch (dummy) {
 521                 case RPC_AUTH_NULL:
 522                         /* Nothing to read */
 523                         if (cbs->flavor == (u32)(-1))
 524                                 cbs->flavor = RPC_AUTH_NULL;
 525                         break;
 526                 case RPC_AUTH_UNIX:
 527                         READ_BUF(8);
 528                         /* stamp */
 529                         dummy = be32_to_cpup(p++);
 530
 531                         /* machine name */
 532                         dummy = be32_to_cpup(p++);
 533                         READ_BUF(dummy);
 534                         SAVEMEM(machine_name, dummy);
 535
 536                         /* uid, gid */
 537                         READ_BUF(8);
 538                         uid = be32_to_cpup(p++);
 539                         gid = be32_to_cpup(p++);
 540
 541                         /* more gids */
 542                         READ_BUF(4);
 543                         dummy = be32_to_cpup(p++);
 544                         READ_BUF(dummy * 4);
 545                         if (cbs->flavor == (u32)(-1)) {
 546                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 547                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 548                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 549                                         cbs->uid = kuid;
 550                                         cbs->gid = kgid;
 551                                         cbs->flavor = RPC_AUTH_UNIX;
 552                                 } else {
 553                                         dprintk("RPC_AUTH_UNIX with invalid"
 554                                                 "uid or gid ignoring!\n");
 555                                 }
 556                         }
 557                         break;
 558                 case RPC_AUTH_GSS:
 559                         dprintk("RPC_AUTH_GSS callback secflavor "
 560                                 "not supported!\n");
 561                         READ_BUF(8);
 562                         /* gcbp_service */
 563                         dummy = be32_to_cpup(p++);
 564                         /* gcbp_handle_from_server */
 565                         dummy = be32_to_cpup(p++);
 566                         READ_BUF(dummy);
 567                         p += XDR_QUADLEN(dummy);
 568                         /* gcbp_handle_from_client */
 569                         READ_BUF(4);
 570                         dummy = be32_to_cpup(p++);
 571                         READ_BUF(dummy);
 572                         break;
 573                 default:
 574                         dprintk("Illegal callback secflavor\n");
 575                         return nfserr_inval;
 576                 }
 577         }
 578         DECODE_TAIL;
 579 }
 580
 581 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 582 {
 583         DECODE_HEAD;
 584
 585         READ_BUF(4);
 586         bc->bc_cb_program = be32_to_cpup(p++);
 587         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 588
 589         DECODE_TAIL;
 590 }
 591
 592 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 593 {
 594         DECODE_HEAD;
 595
 596         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 597         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 598         bcts->dir = be32_to_cpup(p++);
 599         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 600          * could help us figure out we should be using it. */
 601         DECODE_TAIL;
 602 }
 603
 604 static __be32
 605 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 606 {
 607         DECODE_HEAD;
 608
 609         READ_BUF(4);
 610         close->cl_seqid = be32_to_cpup(p++);
 611         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 612
 613         DECODE_TAIL;
 614 }
 615
 616
 617 static __be32
 618 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 619 {
 620         DECODE_HEAD;
 621
 622         READ_BUF(12);
 623         p = xdr_decode_hyper(p, &commit->co_offset);
 624         commit->co_count = be32_to_cpup(p++);
 625
 626         DECODE_TAIL;
 627 }
 628
 629 static __be32
 630 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 631 {
 632         DECODE_HEAD;
 633
 634         READ_BUF(4);
 635         create->cr_type = be32_to_cpup(p++);
 636         switch (create->cr_type) {
 637         case NF4LNK:
 638                 READ_BUF(4);
 639                 create->cr_datalen = be32_to_cpup(p++);
 640                 READ_BUF(create->cr_datalen);
 641                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 642                 if (!create->cr_data)
 643                         return nfserr_jukebox;
 644                 break;
 645         case NF4BLK:
 646         case NF4CHR:
 647                 READ_BUF(8);
 648                 create->cr_specdata1 = be32_to_cpup(p++);
 649                 create->cr_specdata2 = be32_to_cpup(p++);
 650                 break;
 651         case NF4SOCK:
 652         case NF4FIFO:
 653         case NF4DIR:
 654         default:
 655                 break;
 656         }
 657
 658         READ_BUF(4);
 659         create->cr_namelen = be32_to_cpup(p++);
 660         READ_BUF(create->cr_namelen);
 661         SAVEMEM(create->cr_name, create->cr_namelen);
 662         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 663                 return status;
 664
 665         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 666                                     &create->cr_acl, &create->cr_label,
 667                                     &current->fs->umask);
 668         if (status)
 669                 goto out;
 670
 671         DECODE_TAIL;
 672 }
 673
 674 static inline __be32
 675 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 676 {
 677         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 678 }
 679
 680 static inline __be32
 681 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 682 {
 683         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 684 }
 685
 686 static __be32
 687 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 688 {
 689         DECODE_HEAD;
 690
 691         READ_BUF(4);
 692         link->li_namelen = be32_to_cpup(p++);
 693         READ_BUF(link->li_namelen);
 694         SAVEMEM(link->li_name, link->li_namelen);
 695         if ((status = check_filename(link->li_name, link->li_namelen)))
 696                 return status;
 697
 698         DECODE_TAIL;
 699 }
 700
 701 static __be32
 702 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 703 {
 704         DECODE_HEAD;
 705
 706         /*
 707         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 708         */
 709         READ_BUF(28);
 710         lock->lk_type = be32_to_cpup(p++);
 711         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 712                 goto xdr_error;
 713         lock->lk_reclaim = be32_to_cpup(p++);
 714         p = xdr_decode_hyper(p, &lock->lk_offset);
 715         p = xdr_decode_hyper(p, &lock->lk_length);
 716         lock->lk_is_new = be32_to_cpup(p++);
 717
 718         if (lock->lk_is_new) {
 719                 READ_BUF(4);
 720                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 721                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 722                 if (status)
 723                         return status;
 724                 READ_BUF(8 + sizeof(clientid_t));
 725                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 726                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 727                 lock->lk_new_owner.len = be32_to_cpup(p++);
 728                 READ_BUF(lock->lk_new_owner.len);
 729                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 730         } else {
 731                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 732                 if (status)
 733                         return status;
 734                 READ_BUF(4);
 735                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 736         }
 737
 738         DECODE_TAIL;
 739 }
 740
 741 static __be32
 742 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 743 {
 744         DECODE_HEAD;
 745
 746         READ_BUF(32);
 747         lockt->lt_type = be32_to_cpup(p++);
 748         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 749                 goto xdr_error;
 750         p = xdr_decode_hyper(p, &lockt->lt_offset);
 751         p = xdr_decode_hyper(p, &lockt->lt_length);
 752         COPYMEM(&lockt->lt_clientid, 8);
 753         lockt->lt_owner.len = be32_to_cpup(p++);
 754         READ_BUF(lockt->lt_owner.len);
 755         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 756
 757         DECODE_TAIL;
 758 }
 759
 760 static __be32
 761 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 762 {
 763         DECODE_HEAD;
 764
 765         READ_BUF(8);
 766         locku->lu_type = be32_to_cpup(p++);
 767         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 768                 goto xdr_error;
 769         locku->lu_seqid = be32_to_cpup(p++);
 770         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 771         if (status)
 772                 return status;
 773         READ_BUF(16);
 774         p = xdr_decode_hyper(p, &locku->lu_offset);
 775         p = xdr_decode_hyper(p, &locku->lu_length);
 776
 777         DECODE_TAIL;
 778 }
 779
 780 static __be32
 781 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 782 {
 783         DECODE_HEAD;
 784
 785         READ_BUF(4);
 786         lookup->lo_len = be32_to_cpup(p++);
 787         READ_BUF(lookup->lo_len);
 788         SAVEMEM(lookup->lo_name, lookup->lo_len);
 789         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 790                 return status;
 791
 792         DECODE_TAIL;
 793 }
 794
 795 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 796 {
 797         __be32 *p;
 798         u32 w;
 799
 800         READ_BUF(4);
 801         w = be32_to_cpup(p++);
 802         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 803         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 804         if (deleg_when)
 805                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 806
 807         switch (w & NFS4_SHARE_ACCESS_MASK) {
 808         case NFS4_SHARE_ACCESS_READ:
 809         case NFS4_SHARE_ACCESS_WRITE:
 810         case NFS4_SHARE_ACCESS_BOTH:
 811                 break;
 812         default:
 813                 return nfserr_bad_xdr;
 814         }
 815         w &= ~NFS4_SHARE_ACCESS_MASK;
 816         if (!w)
 817                 return nfs_ok;
 818         if (!argp->minorversion)
 819                 return nfserr_bad_xdr;
 820         switch (w & NFS4_SHARE_WANT_MASK) {
 821         case NFS4_SHARE_WANT_NO_PREFERENCE:
 822         case NFS4_SHARE_WANT_READ_DELEG:
 823         case NFS4_SHARE_WANT_WRITE_DELEG:
 824         case NFS4_SHARE_WANT_ANY_DELEG:
 825         case NFS4_SHARE_WANT_NO_DELEG:
 826         case NFS4_SHARE_WANT_CANCEL:
 827                 break;
 828         default:
 829                 return nfserr_bad_xdr;
 830         }
 831         w &= ~NFS4_SHARE_WANT_MASK;
 832         if (!w)
 833                 return nfs_ok;
 834
 835         if (!deleg_when)        /* open_downgrade */
 836                 return nfserr_inval;
 837         switch (w) {
 838         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 839         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 840         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 841               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 842                 return nfs_ok;
 843         }
 844 xdr_error:
 845         return nfserr_bad_xdr;
 846 }
 847
 848 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 849 {
 850         __be32 *p;
 851
 852         READ_BUF(4);
 853         *x = be32_to_cpup(p++);
 854         /* Note: unlinke access bits, deny bits may be zero. */
 855         if (*x & ~NFS4_SHARE_DENY_BOTH)
 856                 return nfserr_bad_xdr;
 857         return nfs_ok;
 858 xdr_error:
 859         return nfserr_bad_xdr;
 860 }
 861
 862 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 863 {
 864         __be32 *p;
 865
 866         READ_BUF(4);
 867         o->len = be32_to_cpup(p++);
 868
 869         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 870                 return nfserr_bad_xdr;
 871
 872         READ_BUF(o->len);
 873         SAVEMEM(o->data, o->len);
 874         return nfs_ok;
 875 xdr_error:
 876         return nfserr_bad_xdr;
 877 }
 878
 879 static __be32
 880 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 881 {
 882         DECODE_HEAD;
 883         u32 dummy;
 884
 885         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 886         open->op_iattr.ia_valid = 0;
 887         open->op_openowner = NULL;
 888
 889         open->op_xdr_error = 0;
 890         /* seqid, share_access, share_deny, clientid, ownerlen */
 891         READ_BUF(4);
 892         open->op_seqid = be32_to_cpup(p++);
 893         /* decode, yet ignore deleg_when until supported */
 894         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 895                                            &open->op_deleg_want, &dummy);
 896         if (status)
 897                 goto xdr_error;
 898         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 899         if (status)
 900                 goto xdr_error;
 901         READ_BUF(sizeof(clientid_t));
 902         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 903         status = nfsd4_decode_opaque(argp, &open->op_owner);
 904         if (status)
 905                 goto xdr_error;
 906         READ_BUF(4);
 907         open->op_create = be32_to_cpup(p++);
 908         switch (open->op_create) {
 909         case NFS4_OPEN_NOCREATE:
 910                 break;
 911         case NFS4_OPEN_CREATE:
 912                 current->fs->umask = 0;
 913                 READ_BUF(4);
 914                 open->op_createmode = be32_to_cpup(p++);
 915                 switch (open->op_createmode) {
 916                 case NFS4_CREATE_UNCHECKED:
 917                 case NFS4_CREATE_GUARDED:
 918                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 919                                 &open->op_iattr, &open->op_acl, &open->op_label,
 920                                 &current->fs->umask);
 921                         if (status)
 922                                 goto out;
 923                         break;
 924                 case NFS4_CREATE_EXCLUSIVE:
 925                         READ_BUF(NFS4_VERIFIER_SIZE);
 926                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 927                         break;
 928                 case NFS4_CREATE_EXCLUSIVE4_1:
 929                         if (argp->minorversion < 1)
 930                                 goto xdr_error;
 931                         READ_BUF(NFS4_VERIFIER_SIZE);
 932                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 933                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 934                                 &open->op_iattr, &open->op_acl, &open->op_label,
 935                                 &current->fs->umask);
 936                         if (status)
 937                                 goto out;
 938                         break;
 939                 default:
 940                         goto xdr_error;
 941                 }
 942                 break;
 943         default:
 944                 goto xdr_error;
 945         }
 946
 947         /* open_claim */
 948         READ_BUF(4);
 949         open->op_claim_type = be32_to_cpup(p++);
 950         switch (open->op_claim_type) {
 951         case NFS4_OPEN_CLAIM_NULL:
 952         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 953                 READ_BUF(4);
 954                 open->op_fname.len = be32_to_cpup(p++);
 955                 READ_BUF(open->op_fname.len);
 956                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 957                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 958                         return status;
 959                 break;
 960         case NFS4_OPEN_CLAIM_PREVIOUS:
 961                 READ_BUF(4);
 962                 open->op_delegate_type = be32_to_cpup(p++);
 963                 break;
 964         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 965                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 966                 if (status)
 967                         return status;
 968                 READ_BUF(4);
 969                 open->op_fname.len = be32_to_cpup(p++);
 970                 READ_BUF(open->op_fname.len);
 971                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 972                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 973                         return status;
 974                 break;
 975         case NFS4_OPEN_CLAIM_FH:
 976         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 977                 if (argp->minorversion < 1)
 978                         goto xdr_error;
 979                 /* void */
 980                 break;
 981         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 982                 if (argp->minorversion < 1)
 983                         goto xdr_error;
 984                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 985                 if (status)
 986                         return status;
 987                 break;
 988         default:
 989                 goto xdr_error;
 990         }
 991
 992         DECODE_TAIL;
 993 }
 994
 995 static __be32
 996 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 997 {
 998         DECODE_HEAD;
 999
1000         if (argp->minorversion >= 1)
1001                 return nfserr_notsupp;
1002
1003         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1004         if (status)
1005                 return status;
1006         READ_BUF(4);
1007         open_conf->oc_seqid = be32_to_cpup(p++);
1008
1009         DECODE_TAIL;
1010 }
1011
1012 static __be32
1013 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1014 {
1015         DECODE_HEAD;
1016
1017         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1018         if (status)
1019                 return status;
1020         READ_BUF(4);
1021         open_down->od_seqid = be32_to_cpup(p++);
1022         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1023                                            &open_down->od_deleg_want, NULL);
1024         if (status)
1025                 return status;
1026         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1027         if (status)
1028                 return status;
1029         DECODE_TAIL;
1030 }
1031
1032 static __be32
1033 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1034 {
1035         DECODE_HEAD;
1036
1037         READ_BUF(4);
1038         putfh->pf_fhlen = be32_to_cpup(p++);
1039         if (putfh->pf_fhlen > NFS4_FHSIZE)
1040                 goto xdr_error;
1041         READ_BUF(putfh->pf_fhlen);
1042         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1043
1044         DECODE_TAIL;
1045 }
1046
1047 static __be32
1048 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1049 {
1050         if (argp->minorversion == 0)
1051                 return nfs_ok;
1052         return nfserr_notsupp;
1053 }
1054
1055 static __be32
1056 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1057 {
1058         DECODE_HEAD;
1059
1060         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1061         if (status)
1062                 return status;
1063         READ_BUF(12);
1064         p = xdr_decode_hyper(p, &read->rd_offset);
1065         read->rd_length = be32_to_cpup(p++);
1066
1067         DECODE_TAIL;
1068 }
1069
1070 static __be32
1071 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1072 {
1073         DECODE_HEAD;
1074
1075         READ_BUF(24);
1076         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1077         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1078         readdir->rd_dircount = be32_to_cpup(p++);
1079         readdir->rd_maxcount = be32_to_cpup(p++);
1080         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1081                 goto out;
1082
1083         DECODE_TAIL;
1084 }
1085
1086 static __be32
1087 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1088 {
1089         DECODE_HEAD;
1090
1091         READ_BUF(4);
1092         remove->rm_namelen = be32_to_cpup(p++);
1093         READ_BUF(remove->rm_namelen);
1094         SAVEMEM(remove->rm_name, remove->rm_namelen);
1095         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1096                 return status;
1097
1098         DECODE_TAIL;
1099 }
1100
1101 static __be32
1102 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1103 {
1104         DECODE_HEAD;
1105
1106         READ_BUF(4);
1107         rename->rn_snamelen = be32_to_cpup(p++);
1108         READ_BUF(rename->rn_snamelen);
1109         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1110         READ_BUF(4);
1111         rename->rn_tnamelen = be32_to_cpup(p++);
1112         READ_BUF(rename->rn_tnamelen);
1113         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1114         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1115                 return status;
1116         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1117                 return status;
1118
1119         DECODE_TAIL;
1120 }
1121
1122 static __be32
1123 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1124 {
1125         DECODE_HEAD;
1126
1127         if (argp->minorversion >= 1)
1128                 return nfserr_notsupp;
1129
1130         READ_BUF(sizeof(clientid_t));
1131         COPYMEM(clientid, sizeof(clientid_t));
1132
1133         DECODE_TAIL;
1134 }
1135
1136 static __be32
1137 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1138                      struct nfsd4_secinfo *secinfo)
1139 {
1140         DECODE_HEAD;
1141
1142         READ_BUF(4);
1143         secinfo->si_namelen = be32_to_cpup(p++);
1144         READ_BUF(secinfo->si_namelen);
1145         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1146         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1147         if (status)
1148                 return status;
1149         DECODE_TAIL;
1150 }
1151
1152 static __be32
1153 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1154                      struct nfsd4_secinfo_no_name *sin)
1155 {
1156         DECODE_HEAD;
1157
1158         READ_BUF(4);
1159         sin->sin_style = be32_to_cpup(p++);
1160         DECODE_TAIL;
1161 }
1162
1163 static __be32
1164 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1165 {
1166         __be32 status;
1167
1168         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1169         if (status)
1170                 return status;
1171         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1172                                   &setattr->sa_acl, &setattr->sa_label, NULL);
1173 }
1174
1175 static __be32
1176 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1177 {
1178         DECODE_HEAD;
1179
1180         if (argp->minorversion >= 1)
1181                 return nfserr_notsupp;
1182
1183         READ_BUF(NFS4_VERIFIER_SIZE);
1184         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1185
1186         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1187         if (status)
1188                 return nfserr_bad_xdr;
1189         READ_BUF(8);
1190         setclientid->se_callback_prog = be32_to_cpup(p++);
1191         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1192         READ_BUF(setclientid->se_callback_netid_len);
1193         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1194         READ_BUF(4);
1195         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1196
1197         READ_BUF(setclientid->se_callback_addr_len);
1198         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1199         READ_BUF(4);
1200         setclientid->se_callback_ident = be32_to_cpup(p++);
1201
1202         DECODE_TAIL;
1203 }
1204
1205 static __be32
1206 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1207 {
1208         DECODE_HEAD;
1209
1210         if (argp->minorversion >= 1)
1211                 return nfserr_notsupp;
1212
1213         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1214         COPYMEM(&scd_c->sc_clientid, 8);
1215         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1216
1217         DECODE_TAIL;
1218 }
1219
1220 /* Also used for NVERIFY */
1221 static __be32
1222 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1223 {
1224         DECODE_HEAD;
1225
1226         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1227                 goto out;
1228
1229         /* For convenience's sake, we compare raw xdr'd attributes in
1230          * nfsd4_proc_verify */
1231
1232         READ_BUF(4);
1233         verify->ve_attrlen = be32_to_cpup(p++);
1234         READ_BUF(verify->ve_attrlen);
1235         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1236
1237         DECODE_TAIL;
1238 }
1239
1240 static __be32
1241 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1242 {
1243         int avail;
1244         int len;
1245         DECODE_HEAD;
1246
1247         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1248         if (status)
1249                 return status;
1250         READ_BUF(16);
1251         p = xdr_decode_hyper(p, &write->wr_offset);
1252         write->wr_stable_how = be32_to_cpup(p++);
1253         if (write->wr_stable_how > 2)
1254                 goto xdr_error;
1255         write->wr_buflen = be32_to_cpup(p++);
1256
1257         /* Sorry .. no magic macros for this.. *
1258          * READ_BUF(write->wr_buflen);
1259          * SAVEMEM(write->wr_buf, write->wr_buflen);
1260          */
1261         avail = (char*)argp->end - (char*)argp->p;
1262         if (avail + argp->pagelen < write->wr_buflen) {
1263                 dprintk("NFSD: xdr error (%s:%d)\n",
1264                                 __FILE__, __LINE__);
1265                 goto xdr_error;
1266         }
1267         write->wr_head.iov_base = p;
1268         write->wr_head.iov_len = avail;
1269         write->wr_pagelist = argp->pagelist;
1270
1271         len = XDR_QUADLEN(write->wr_buflen) << 2;
1272         if (len >= avail) {
1273                 int pages;
1274
1275                 len -= avail;
1276
1277                 pages = len >> PAGE_SHIFT;
1278                 argp->pagelist += pages;
1279                 argp->pagelen -= pages * PAGE_SIZE;
1280                 len -= pages * PAGE_SIZE;
1281
1282                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1283                 argp->pagelist++;
1284                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1285         }
1286         argp->p += XDR_QUADLEN(len);
1287
1288         DECODE_TAIL;
1289 }
1290
1291 static __be32
1292 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1293 {
1294         DECODE_HEAD;
1295
1296         if (argp->minorversion >= 1)
1297                 return nfserr_notsupp;
1298
1299         READ_BUF(12);
1300         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1301         rlockowner->rl_owner.len = be32_to_cpup(p++);
1302         READ_BUF(rlockowner->rl_owner.len);
1303         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1304
1305         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1306                 return nfserr_inval;
1307         DECODE_TAIL;
1308 }
1309
1310 static __be32
1311 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1312                          struct nfsd4_exchange_id *exid)
1313 {
1314         int dummy, tmp;
1315         DECODE_HEAD;
1316
1317         READ_BUF(NFS4_VERIFIER_SIZE);
1318         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1319
1320         status = nfsd4_decode_opaque(argp, &exid->clname);
1321         if (status)
1322                 return nfserr_bad_xdr;
1323
1324         READ_BUF(4);
1325         exid->flags = be32_to_cpup(p++);
1326
1327         /* Ignore state_protect4_a */
1328         READ_BUF(4);
1329         exid->spa_how = be32_to_cpup(p++);
1330         switch (exid->spa_how) {
1331         case SP4_NONE:
1332                 break;
1333         case SP4_MACH_CRED:
1334                 /* spo_must_enforce */
1335                 status = nfsd4_decode_bitmap(argp,
1336                                         exid->spo_must_enforce);
1337                 if (status)
1338                         goto out;
1339                 /* spo_must_allow */
1340                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1341                 if (status)
1342                         goto out;
1343                 break;
1344         case SP4_SSV:
1345                 /* ssp_ops */
1346                 READ_BUF(4);
1347                 dummy = be32_to_cpup(p++);
1348                 READ_BUF(dummy * 4);
1349                 p += dummy;
1350
1351                 READ_BUF(4);
1352                 dummy = be32_to_cpup(p++);
1353                 READ_BUF(dummy * 4);
1354                 p += dummy;
1355
1356                 /* ssp_hash_algs<> */
1357                 READ_BUF(4);
1358                 tmp = be32_to_cpup(p++);
1359                 while (tmp--) {
1360                         READ_BUF(4);
1361                         dummy = be32_to_cpup(p++);
1362                         READ_BUF(dummy);
1363                         p += XDR_QUADLEN(dummy);
1364                 }
1365
1366                 /* ssp_encr_algs<> */
1367                 READ_BUF(4);
1368                 tmp = be32_to_cpup(p++);
1369                 while (tmp--) {
1370                         READ_BUF(4);
1371                         dummy = be32_to_cpup(p++);
1372                         READ_BUF(dummy);
1373                         p += XDR_QUADLEN(dummy);
1374                 }
1375
1376                 /* ssp_window and ssp_num_gss_handles */
1377                 READ_BUF(8);
1378                 dummy = be32_to_cpup(p++);
1379                 dummy = be32_to_cpup(p++);
1380                 break;
1381         default:
1382                 goto xdr_error;
1383         }
1384
1385         /* Ignore Implementation ID */
1386         READ_BUF(4);    /* nfs_impl_id4 array length */
1387         dummy = be32_to_cpup(p++);
1388
1389         if (dummy > 1)
1390                 goto xdr_error;
1391
1392         if (dummy == 1) {
1393                 /* nii_domain */
1394                 READ_BUF(4);
1395                 dummy = be32_to_cpup(p++);
1396                 READ_BUF(dummy);
1397                 p += XDR_QUADLEN(dummy);
1398
1399                 /* nii_name */
1400                 READ_BUF(4);
1401                 dummy = be32_to_cpup(p++);
1402                 READ_BUF(dummy);
1403                 p += XDR_QUADLEN(dummy);
1404
1405                 /* nii_date */
1406                 READ_BUF(12);
1407                 p += 3;
1408         }
1409         DECODE_TAIL;
1410 }
1411
1412 static __be32
1413 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1414                             struct nfsd4_create_session *sess)
1415 {
1416         DECODE_HEAD;
1417         u32 dummy;
1418
1419         READ_BUF(16);
1420         COPYMEM(&sess->clientid, 8);
1421         sess->seqid = be32_to_cpup(p++);
1422         sess->flags = be32_to_cpup(p++);
1423
1424         /* Fore channel attrs */
1425         READ_BUF(28);
1426         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1427         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1428         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1429         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1430         sess->fore_channel.maxops = be32_to_cpup(p++);
1431         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1432         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1433         if (sess->fore_channel.nr_rdma_attrs == 1) {
1434                 READ_BUF(4);
1435                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1436         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1437                 dprintk("Too many fore channel attr bitmaps!\n");
1438                 goto xdr_error;
1439         }
1440
1441         /* Back channel attrs */
1442         READ_BUF(28);
1443         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1444         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1445         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1446         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1447         sess->back_channel.maxops = be32_to_cpup(p++);
1448         sess->back_channel.maxreqs = be32_to_cpup(p++);
1449         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1450         if (sess->back_channel.nr_rdma_attrs == 1) {
1451                 READ_BUF(4);
1452                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1453         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1454                 dprintk("Too many back channel attr bitmaps!\n");
1455                 goto xdr_error;
1456         }
1457
1458         READ_BUF(4);
1459         sess->callback_prog = be32_to_cpup(p++);
1460         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1461         DECODE_TAIL;
1462 }
1463
1464 static __be32
1465 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1466                              struct nfsd4_destroy_session *destroy_session)
1467 {
1468         DECODE_HEAD;
1469         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1470         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1471
1472         DECODE_TAIL;
1473 }
1474
1475 static __be32
1476 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1477                           struct nfsd4_free_stateid *free_stateid)
1478 {
1479         DECODE_HEAD;
1480
1481         READ_BUF(sizeof(stateid_t));
1482         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1483         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1484
1485         DECODE_TAIL;
1486 }
1487
1488 static __be32
1489 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1490                       struct nfsd4_sequence *seq)
1491 {
1492         DECODE_HEAD;
1493
1494         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1495         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1496         seq->seqid = be32_to_cpup(p++);
1497         seq->slotid = be32_to_cpup(p++);
1498         seq->maxslots = be32_to_cpup(p++);
1499         seq->cachethis = be32_to_cpup(p++);
1500
1501         DECODE_TAIL;
1502 }
1503
1504 static __be32
1505 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1506 {
1507         int i;
1508         __be32 *p, status;
1509         struct nfsd4_test_stateid_id *stateid;
1510
1511         READ_BUF(4);
1512         test_stateid->ts_num_ids = ntohl(*p++);
1513
1514         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1515
1516         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1517                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1518                 if (!stateid) {
1519                         status = nfserrno(-ENOMEM);
1520                         goto out;
1521                 }
1522
1523                 INIT_LIST_HEAD(&stateid->ts_id_list);
1524                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1525
1526                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1527                 if (status)
1528                         goto out;
1529         }
1530
1531         status = 0;
1532 out:
1533         return status;
1534 xdr_error:
1535         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1536         status = nfserr_bad_xdr;
1537         goto out;
1538 }
1539
1540 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1541 {
1542         DECODE_HEAD;
1543
1544         READ_BUF(8);
1545         COPYMEM(&dc->clientid, 8);
1546
1547         DECODE_TAIL;
1548 }
1549
1550 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1551 {
1552         DECODE_HEAD;
1553
1554         READ_BUF(4);
1555         rc->rca_one_fs = be32_to_cpup(p++);
1556
1557         DECODE_TAIL;
1558 }
1559
1560 #ifdef CONFIG_NFSD_PNFS
1561 static __be32
1562 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1563                 struct nfsd4_getdeviceinfo *gdev)
1564 {
1565         DECODE_HEAD;
1566         u32 num, i;
1567
1568         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1569         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1570         gdev->gd_layout_type = be32_to_cpup(p++);
1571         gdev->gd_maxcount = be32_to_cpup(p++);
1572         num = be32_to_cpup(p++);
1573         if (num) {
1574                 READ_BUF(4 * num);
1575                 gdev->gd_notify_types = be32_to_cpup(p++);
1576                 for (i = 1; i < num; i++) {
1577                         if (be32_to_cpup(p++)) {
1578                                 status = nfserr_inval;
1579                                 goto out;
1580                         }
1581                 }
1582         }
1583         DECODE_TAIL;
1584 }
1585
1586 static __be32
1587 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1588                 struct nfsd4_layoutget *lgp)
1589 {
1590         DECODE_HEAD;
1591
1592         READ_BUF(36);
1593         lgp->lg_signal = be32_to_cpup(p++);
1594         lgp->lg_layout_type = be32_to_cpup(p++);
1595         lgp->lg_seg.iomode = be32_to_cpup(p++);
1596         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1597         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1598         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1599
1600         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1601         if (status)
1602                 return status;
1603
1604         READ_BUF(4);
1605         lgp->lg_maxcount = be32_to_cpup(p++);
1606
1607         DECODE_TAIL;
1608 }
1609
1610 static __be32
1611 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1612                 struct nfsd4_layoutcommit *lcp)
1613 {
1614         DECODE_HEAD;
1615         u32 timechange;
1616
1617         READ_BUF(20);
1618         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1619         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1620         lcp->lc_reclaim = be32_to_cpup(p++);
1621
1622         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1623         if (status)
1624                 return status;
1625
1626         READ_BUF(4);
1627         lcp->lc_newoffset = be32_to_cpup(p++);
1628         if (lcp->lc_newoffset) {
1629                 READ_BUF(8);
1630                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1631         } else
1632                 lcp->lc_last_wr = 0;
1633         READ_BUF(4);
1634         timechange = be32_to_cpup(p++);
1635         if (timechange) {
1636                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1637                 if (status)
1638                         return status;
1639         } else {
1640                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1641         }
1642         READ_BUF(8);
1643         lcp->lc_layout_type = be32_to_cpup(p++);
1644
1645         /*
1646          * Save the layout update in XDR format and let the layout driver deal
1647          * with it later.
1648          */
1649         lcp->lc_up_len = be32_to_cpup(p++);
1650         if (lcp->lc_up_len > 0) {
1651                 READ_BUF(lcp->lc_up_len);
1652                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1653         }
1654
1655         DECODE_TAIL;
1656 }
1657
1658 static __be32
1659 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1660                 struct nfsd4_layoutreturn *lrp)
1661 {
1662         DECODE_HEAD;
1663
1664         READ_BUF(16);
1665         lrp->lr_reclaim = be32_to_cpup(p++);
1666         lrp->lr_layout_type = be32_to_cpup(p++);
1667         lrp->lr_seg.iomode = be32_to_cpup(p++);
1668         lrp->lr_return_type = be32_to_cpup(p++);
1669         if (lrp->lr_return_type == RETURN_FILE) {
1670                 READ_BUF(16);
1671                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1672                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1673
1674                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1675                 if (status)
1676                         return status;
1677
1678                 READ_BUF(4);
1679                 lrp->lrf_body_len = be32_to_cpup(p++);
1680                 if (lrp->lrf_body_len > 0) {
1681                         READ_BUF(lrp->lrf_body_len);
1682                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1683                 }
1684         } else {
1685                 lrp->lr_seg.offset = 0;
1686                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1687         }
1688
1689         DECODE_TAIL;
1690 }
1691 #endif /* CONFIG_NFSD_PNFS */
1692
1693 static __be32
1694 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1695                        struct nfsd4_fallocate *fallocate)
1696 {
1697         DECODE_HEAD;
1698
1699         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1700         if (status)
1701                 return status;
1702
1703         READ_BUF(16);
1704         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1705         xdr_decode_hyper(p, &fallocate->falloc_length);
1706
1707         DECODE_TAIL;
1708 }
1709
1710 static __be32
1711 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1712 {
1713         DECODE_HEAD;
1714
1715         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1716         if (status)
1717                 return status;
1718         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1719         if (status)
1720                 return status;
1721
1722         READ_BUF(8 + 8 + 8);
1723         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1724         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1725         p = xdr_decode_hyper(p, &clone->cl_count);
1726         DECODE_TAIL;
1727 }
1728
1729 static __be32
1730 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1731 {
1732         DECODE_HEAD;
1733         unsigned int tmp;
1734
1735         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1736         if (status)
1737                 return status;
1738         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1739         if (status)
1740                 return status;
1741
1742         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1743         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1744         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1745         p = xdr_decode_hyper(p, &copy->cp_count);
1746         copy->cp_consecutive = be32_to_cpup(p++);
1747         copy->cp_synchronous = be32_to_cpup(p++);
1748         tmp = be32_to_cpup(p); /* Source server list not supported */
1749
1750         DECODE_TAIL;
1751 }
1752
1753 static __be32
1754 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1755 {
1756         DECODE_HEAD;
1757
1758         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1759         if (status)
1760                 return status;
1761
1762         READ_BUF(8 + 4);
1763         p = xdr_decode_hyper(p, &seek->seek_offset);
1764         seek->seek_whence = be32_to_cpup(p);
1765
1766         DECODE_TAIL;
1767 }
1768
1769 static __be32
1770 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1771 {
1772         return nfs_ok;
1773 }
1774
1775 static __be32
1776 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1777 {
1778         return nfserr_notsupp;
1779 }
1780
1781 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1782
1783 static nfsd4_dec nfsd4_dec_ops[] = {
1784         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1785         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1786         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1787         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1788         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1789         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1790         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1791         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1792         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1793         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1794         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1795         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1796         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1797         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1798         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1799         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1800         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1801         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1802         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1803         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1804         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1805         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1806         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1807         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1808         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1809         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1810         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1811         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1812         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1813         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1814         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1815         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1816         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1817         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1818         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1819         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1820         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1821
1822         /* new operations for NFSv4.1 */
1823         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1824         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1825         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1826         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1827         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1828         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1829         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1830 #ifdef CONFIG_NFSD_PNFS
1831         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1832         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1833         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1834         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1835         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1836 #else
1837         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1838         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1839         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1840         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1841         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1842 #endif
1843         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1844         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1845         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1846         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1847         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1848         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1849         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1850
1851         /* new operations for NFSv4.2 */
1852         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1853         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1854         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1855         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1856         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1857         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1858         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1859         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1860         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1861         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1862         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1863         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1864         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1865 };
1866
1867 static inline bool
1868 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1869 {
1870         if (op->opnum < FIRST_NFS4_OP)
1871                 return false;
1872         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1873                 return false;
1874         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1875                 return false;
1876         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1877                 return false;
1878         return true;
1879 }
1880
1881 static __be32
1882 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1883 {
1884         DECODE_HEAD;
1885         struct nfsd4_op *op;
1886         bool cachethis = false;
1887         int auth_slack= argp->rqstp->rq_auth_slack;
1888         int max_reply = auth_slack + 8; /* opcnt, status */
1889         int readcount = 0;
1890         int readbytes = 0;
1891         int i;
1892
1893         READ_BUF(4);
1894         argp->taglen = be32_to_cpup(p++);
1895         READ_BUF(argp->taglen);
1896         SAVEMEM(argp->tag, argp->taglen);
1897         READ_BUF(8);
1898         argp->minorversion = be32_to_cpup(p++);
1899         argp->opcnt = be32_to_cpup(p++);
1900         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1901
1902         if (argp->taglen > NFSD4_MAX_TAGLEN)
1903                 goto xdr_error;
1904         if (argp->opcnt > 100)
1905                 goto xdr_error;
1906
1907         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1908                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1909                 if (!argp->ops) {
1910                         argp->ops = argp->iops;
1911                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1912                         goto xdr_error;
1913                 }
1914         }
1915
1916         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1917                 argp->opcnt = 0;
1918
1919         for (i = 0; i < argp->opcnt; i++) {
1920                 op = &argp->ops[i];
1921                 op->replay = NULL;
1922
1923                 READ_BUF(4);
1924                 op->opnum = be32_to_cpup(p++);
1925
1926                 if (nfsd4_opnum_in_range(argp, op))
1927                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1928                 else {
1929                         op->opnum = OP_ILLEGAL;
1930                         op->status = nfserr_op_illegal;
1931                 }
1932                 /*
1933                  * We'll try to cache the result in the DRC if any one
1934                  * op in the compound wants to be cached:
1935                  */
1936                 cachethis |= nfsd4_cache_this_op(op);
1937
1938                 if (op->opnum == OP_READ) {
1939                         readcount++;
1940                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1941                 } else
1942                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1943                 /*
1944                  * OP_LOCK may return a conflicting lock.  (Special case
1945                  * because it will just skip encoding this if it runs
1946                  * out of xdr buffer space, and it is the only operation
1947                  * that behaves this way.)
1948                  */
1949                 if (op->opnum == OP_LOCK)
1950                         max_reply += NFS4_OPAQUE_LIMIT;
1951
1952                 if (op->status) {
1953                         argp->opcnt = i+1;
1954                         break;
1955                 }
1956         }
1957         /* Sessions make the DRC unnecessary: */
1958         if (argp->minorversion)
1959                 cachethis = false;
1960         svc_reserve(argp->rqstp, max_reply + readbytes);
1961         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1962
1963         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1964                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1965
1966         DECODE_TAIL;
1967 }
1968
1969 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1970 {
1971         if (IS_I_VERSION(inode)) {
1972                 p = xdr_encode_hyper(p, inode->i_version);
1973         } else {
1974                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1975                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1976         }
1977         return p;
1978 }
1979
1980 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1981 {
1982         *p++ = cpu_to_be32(c->atomic);
1983         if (c->change_supported) {
1984                 p = xdr_encode_hyper(p, c->before_change);
1985                 p = xdr_encode_hyper(p, c->after_change);
1986         } else {
1987                 *p++ = cpu_to_be32(c->before_ctime_sec);
1988                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1989                 *p++ = cpu_to_be32(c->after_ctime_sec);
1990                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1991         }
1992         return p;
1993 }
1994
1995 /* Encode as an array of strings the string given with components
1996  * separated @sep, escaped with esc_enter and esc_exit.
1997  */
1998 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1999                                           char *components, char esc_enter,
2000                                           char esc_exit)
2001 {
2002         __be32 *p;
2003         __be32 pathlen;
2004         int pathlen_offset;
2005         int strlen, count=0;
2006         char *str, *end, *next;
2007
2008         dprintk("nfsd4_encode_components(%s)\n", components);
2009
2010         pathlen_offset = xdr->buf->len;
2011         p = xdr_reserve_space(xdr, 4);
2012         if (!p)
2013                 return nfserr_resource;
2014         p++; /* We will fill this in with @count later */
2015
2016         end = str = components;
2017         while (*end) {
2018                 bool found_esc = false;
2019
2020                 /* try to parse as esc_start, ..., esc_end, sep */
2021                 if (*str == esc_enter) {
2022                         for (; *end && (*end != esc_exit); end++)
2023                                 /* find esc_exit or end of string */;
2024                         next = end + 1;
2025                         if (*end && (!*next || *next == sep)) {
2026                                 str++;
2027                                 found_esc = true;
2028                         }
2029                 }
2030
2031                 if (!found_esc)
2032                         for (; *end && (*end != sep); end++)
2033                                 /* find sep or end of string */;
2034
2035                 strlen = end - str;
2036                 if (strlen) {
2037                         p = xdr_reserve_space(xdr, strlen + 4);
2038                         if (!p)
2039                                 return nfserr_resource;
2040                         p = xdr_encode_opaque(p, str, strlen);
2041                         count++;
2042                 }
2043                 else
2044                         end++;
2045                 if (found_esc)
2046                         end = next;
2047
2048                 str = end;
2049         }
2050         pathlen = htonl(count);
2051         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2052         return 0;
2053 }
2054
2055 /* Encode as an array of strings the string given with components
2056  * separated @sep.
2057  */
2058 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2059                                       char *components)
2060 {
2061         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2062 }
2063
2064 /*
2065  * encode a location element of a fs_locations structure
2066  */
2067 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2068                                         struct nfsd4_fs_location *location)
2069 {
2070         __be32 status;
2071
2072         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2073                                                 '[', ']');
2074         if (status)
2075                 return status;
2076         status = nfsd4_encode_components(xdr, '/', location->path);
2077         if (status)
2078                 return status;
2079         return 0;
2080 }
2081
2082 /*
2083  * Encode a path in RFC3530 'pathname4' format
2084  */
2085 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2086                                 const struct path *root,
2087                                 const struct path *path)
2088 {
2089         struct path cur = *path;
2090         __be32 *p;
2091         struct dentry **components = NULL;
2092         unsigned int ncomponents = 0;
2093         __be32 err = nfserr_jukebox;
2094
2095         dprintk("nfsd4_encode_components(");
2096
2097         path_get(&cur);
2098         /* First walk the path up to the nfsd root, and store the
2099          * dentries/path components in an array.
2100          */
2101         for (;;) {
2102                 if (path_equal(&cur, root))
2103                         break;
2104                 if (cur.dentry == cur.mnt->mnt_root) {
2105                         if (follow_up(&cur))
2106                                 continue;
2107                         goto out_free;
2108                 }
2109                 if ((ncomponents & 15) == 0) {
2110                         struct dentry **new;
2111                         new = krealloc(components,
2112                                         sizeof(*new) * (ncomponents + 16),
2113                                         GFP_KERNEL);
2114                         if (!new)
2115                                 goto out_free;
2116                         components = new;
2117                 }
2118                 components[ncomponents++] = cur.dentry;
2119                 cur.dentry = dget_parent(cur.dentry);
2120         }
2121         err = nfserr_resource;
2122         p = xdr_reserve_space(xdr, 4);
2123         if (!p)
2124                 goto out_free;
2125         *p++ = cpu_to_be32(ncomponents);
2126
2127         while (ncomponents) {
2128                 struct dentry *dentry = components[ncomponents - 1];
2129                 unsigned int len;
2130
2131                 spin_lock(&dentry->d_lock);
2132                 len = dentry->d_name.len;
2133                 p = xdr_reserve_space(xdr, len + 4);
2134                 if (!p) {
2135                         spin_unlock(&dentry->d_lock);
2136                         goto out_free;
2137                 }
2138                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2139                 dprintk("/%pd", dentry);
2140                 spin_unlock(&dentry->d_lock);
2141                 dput(dentry);
2142                 ncomponents--;
2143         }
2144
2145         err = 0;
2146 out_free:
2147         dprintk(")\n");
2148         while (ncomponents)
2149                 dput(components[--ncomponents]);
2150         kfree(components);
2151         path_put(&cur);
2152         return err;
2153 }
2154
2155 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2156                         struct svc_rqst *rqstp, const struct path *path)
2157 {
2158         struct svc_export *exp_ps;
2159         __be32 res;
2160
2161         exp_ps = rqst_find_fsidzero_export(rqstp);
2162         if (IS_ERR(exp_ps))
2163                 return nfserrno(PTR_ERR(exp_ps));
2164         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2165         exp_put(exp_ps);
2166         return res;
2167 }
2168
2169 /*
2170  *  encode a fs_locations structure
2171  */
2172 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2173                         struct svc_rqst *rqstp, struct svc_export *exp)
2174 {
2175         __be32 status;
2176         int i;
2177         __be32 *p;
2178         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2179
2180         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2181         if (status)
2182                 return status;
2183         p = xdr_reserve_space(xdr, 4);
2184         if (!p)
2185                 return nfserr_resource;
2186         *p++ = cpu_to_be32(fslocs->locations_count);
2187         for (i=0; i<fslocs->locations_count; i++) {
2188                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2189                 if (status)
2190                         return status;
2191         }
2192         return 0;
2193 }
2194
2195 static u32 nfs4_file_type(umode_t mode)
2196 {
2197         switch (mode & S_IFMT) {
2198         case S_IFIFO:   return NF4FIFO;
2199         case S_IFCHR:   return NF4CHR;
2200         case S_IFDIR:   return NF4DIR;
2201         case S_IFBLK:   return NF4BLK;
2202         case S_IFLNK:   return NF4LNK;
2203         case S_IFREG:   return NF4REG;
2204         case S_IFSOCK:  return NF4SOCK;
2205         default:        return NF4BAD;
2206         };
2207 }
2208
2209 static inline __be32
2210 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2211                      struct nfs4_ace *ace)
2212 {
2213         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2214                 return nfs4_acl_write_who(xdr, ace->whotype);
2215         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2216                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2217         else
2218                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2219 }
2220
2221 static inline __be32
2222 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2223 {
2224         __be32          *p;
2225         unsigned long   i = hweight_long(layout_types);
2226
2227         p = xdr_reserve_space(xdr, 4 + 4 * i);
2228         if (!p)
2229                 return nfserr_resource;
2230
2231         *p++ = cpu_to_be32(i);
2232
2233         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2234                 if (layout_types & (1 << i))
2235                         *p++ = cpu_to_be32(i);
2236
2237         return 0;
2238 }
2239
2240 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2241                               FATTR4_WORD0_RDATTR_ERROR)
2242 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2243 #define WORD2_ABSENT_FS_ATTRS 0
2244
2245 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2246 static inline __be32
2247 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2248                             void *context, int len)
2249 {
2250         __be32 *p;
2251
2252         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2253         if (!p)
2254                 return nfserr_resource;
2255
2256         /*
2257          * For now we use a 0 here to indicate the null translation; in
2258          * the future we may place a call to translation code here.
2259          */
2260         *p++ = cpu_to_be32(0); /* lfs */
2261         *p++ = cpu_to_be32(0); /* pi */
2262         p = xdr_encode_opaque(p, context, len);
2263         return 0;
2264 }
2265 #else
2266 static inline __be32
2267 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2268                             void *context, int len)
2269 { return 0; }
2270 #endif
2271
2272 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2273 {
2274         /* As per referral draft:  */
2275         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2276             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2277                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2278                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2279                         *rdattr_err = NFSERR_MOVED;
2280                 else
2281                         return nfserr_moved;
2282         }
2283         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2284         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2285         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2286         return 0;
2287 }
2288
2289
2290 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2291 {
2292         struct path path = exp->ex_path;
2293         int err;
2294
2295         path_get(&path);
2296         while (follow_up(&path)) {
2297                 if (path.dentry != path.mnt->mnt_root)
2298                         break;
2299         }
2300         err = vfs_getattr(&path, stat);
2301         path_put(&path);
2302         return err;
2303 }
2304
2305 static __be32
2306 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2307 {
2308         __be32 *p;
2309
2310         if (bmval2) {
2311                 p = xdr_reserve_space(xdr, 16);
2312                 if (!p)
2313                         goto out_resource;
2314                 *p++ = cpu_to_be32(3);
2315                 *p++ = cpu_to_be32(bmval0);
2316                 *p++ = cpu_to_be32(bmval1);
2317                 *p++ = cpu_to_be32(bmval2);
2318         } else if (bmval1) {
2319                 p = xdr_reserve_space(xdr, 12);
2320                 if (!p)
2321                         goto out_resource;
2322                 *p++ = cpu_to_be32(2);
2323                 *p++ = cpu_to_be32(bmval0);
2324                 *p++ = cpu_to_be32(bmval1);
2325         } else {
2326                 p = xdr_reserve_space(xdr, 8);
2327                 if (!p)
2328                         goto out_resource;
2329                 *p++ = cpu_to_be32(1);
2330                 *p++ = cpu_to_be32(bmval0);
2331         }
2332
2333         return 0;
2334 out_resource:
2335         return nfserr_resource;
2336 }
2337
2338 /*
2339  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2340  * ourselves.
2341  */
2342 static __be32
2343 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2344                 struct svc_export *exp,
2345                 struct dentry *dentry, u32 *bmval,
2346                 struct svc_rqst *rqstp, int ignore_crossmnt)
2347 {
2348         u32 bmval0 = bmval[0];
2349         u32 bmval1 = bmval[1];
2350         u32 bmval2 = bmval[2];
2351         struct kstat stat;
2352         struct svc_fh *tempfh = NULL;
2353         struct kstatfs statfs;
2354         __be32 *p;
2355         int starting_len = xdr->buf->len;
2356         int attrlen_offset;
2357         __be32 attrlen;
2358         u32 dummy;
2359         u64 dummy64;
2360         u32 rdattr_err = 0;
2361         __be32 status;
2362         int err;
2363         struct nfs4_acl *acl = NULL;
2364         void *context = NULL;
2365         int contextlen;
2366         bool contextsupport = false;
2367         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2368         u32 minorversion = resp->cstate.minorversion;
2369         struct path path = {
2370                 .mnt    = exp->ex_path.mnt,
2371                 .dentry = dentry,
2372         };
2373         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2374
2375         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2376         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2377
2378         if (exp->ex_fslocs.migrated) {
2379                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2380                 if (status)
2381                         goto out;
2382         }
2383
2384         err = vfs_getattr(&path, &stat);
2385         if (err)
2386                 goto out_nfserr;
2387         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2388                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2389             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2390                        FATTR4_WORD1_SPACE_TOTAL))) {
2391                 err = vfs_statfs(&path, &statfs);
2392                 if (err)
2393                         goto out_nfserr;
2394         }
2395         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2396                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2397                 status = nfserr_jukebox;
2398                 if (!tempfh)
2399                         goto out;
2400                 fh_init(tempfh, NFS4_FHSIZE);
2401                 status = fh_compose(tempfh, exp, dentry, NULL);
2402                 if (status)
2403                         goto out;
2404                 fhp = tempfh;
2405         }
2406         if (bmval0 & FATTR4_WORD0_ACL) {
2407                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2408                 if (err == -EOPNOTSUPP)
2409                         bmval0 &= ~FATTR4_WORD0_ACL;
2410                 else if (err == -EINVAL) {
2411                         status = nfserr_attrnotsupp;
2412                         goto out;
2413                 } else if (err != 0)
2414                         goto out_nfserr;
2415         }
2416
2417 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2418         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2419              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2420                 err = security_inode_getsecctx(d_inode(dentry),
2421                                                 &context, &contextlen);
2422                 contextsupport = (err == 0);
2423                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2424                         if (err == -EOPNOTSUPP)
2425                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2426                         else if (err)
2427                                 goto out_nfserr;
2428                 }
2429         }
2430 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2431
2432         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2433         if (status)
2434                 goto out;
2435
2436         attrlen_offset = xdr->buf->len;
2437         p = xdr_reserve_space(xdr, 4);
2438         if (!p)
2439                 goto out_resource;
2440         p++;                /* to be backfilled later */
2441
2442         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2443                 u32 *supp = nfsd_suppattrs[minorversion];
2444
2445                 if (!IS_POSIXACL(dentry->d_inode))
2446                         supp[0] &= ~FATTR4_WORD0_ACL;
2447                 if (!contextsupport)
2448                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2449                 if (!supp[2]) {
2450                         p = xdr_reserve_space(xdr, 12);
2451                         if (!p)
2452                                 goto out_resource;
2453                         *p++ = cpu_to_be32(2);
2454                         *p++ = cpu_to_be32(supp[0]);
2455                         *p++ = cpu_to_be32(supp[1]);
2456                 } else {
2457                         p = xdr_reserve_space(xdr, 16);
2458                         if (!p)
2459                                 goto out_resource;
2460                         *p++ = cpu_to_be32(3);
2461                         *p++ = cpu_to_be32(supp[0]);
2462                         *p++ = cpu_to_be32(supp[1]);
2463                         *p++ = cpu_to_be32(supp[2]);
2464                 }
2465         }
2466         if (bmval0 & FATTR4_WORD0_TYPE) {
2467                 p = xdr_reserve_space(xdr, 4);
2468                 if (!p)
2469                         goto out_resource;
2470                 dummy = nfs4_file_type(stat.mode);
2471                 if (dummy == NF4BAD) {
2472                         status = nfserr_serverfault;
2473                         goto out;
2474                 }
2475                 *p++ = cpu_to_be32(dummy);
2476         }
2477         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2478                 p = xdr_reserve_space(xdr, 4);
2479                 if (!p)
2480                         goto out_resource;
2481                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2482                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2483                 else
2484                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2485                                                 NFS4_FH_VOL_RENAME);
2486         }
2487         if (bmval0 & FATTR4_WORD0_CHANGE) {
2488                 p = xdr_reserve_space(xdr, 8);
2489                 if (!p)
2490                         goto out_resource;
2491                 p = encode_change(p, &stat, d_inode(dentry));
2492         }
2493         if (bmval0 & FATTR4_WORD0_SIZE) {
2494                 p = xdr_reserve_space(xdr, 8);
2495                 if (!p)
2496                         goto out_resource;
2497                 p = xdr_encode_hyper(p, stat.size);
2498         }
2499         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2500                 p = xdr_reserve_space(xdr, 4);
2501                 if (!p)
2502                         goto out_resource;
2503                 *p++ = cpu_to_be32(1);
2504         }
2505         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2506                 p = xdr_reserve_space(xdr, 4);
2507                 if (!p)
2508                         goto out_resource;
2509                 *p++ = cpu_to_be32(1);
2510         }
2511         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2512                 p = xdr_reserve_space(xdr, 4);
2513                 if (!p)
2514                         goto out_resource;
2515                 *p++ = cpu_to_be32(0);
2516         }
2517         if (bmval0 & FATTR4_WORD0_FSID) {
2518                 p = xdr_reserve_space(xdr, 16);
2519                 if (!p)
2520                         goto out_resource;
2521                 if (exp->ex_fslocs.migrated) {
2522                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2523                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2524                 } else switch(fsid_source(fhp)) {
2525                 case FSIDSOURCE_FSID:
2526                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2527                         p = xdr_encode_hyper(p, (u64)0);
2528                         break;
2529                 case FSIDSOURCE_DEV:
2530                         *p++ = cpu_to_be32(0);
2531                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2532                         *p++ = cpu_to_be32(0);
2533                         *p++ = cpu_to_be32(MINOR(stat.dev));
2534                         break;
2535                 case FSIDSOURCE_UUID:
2536                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2537                                                                 EX_UUID_LEN);
2538                         break;
2539                 }
2540         }
2541         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2542                 p = xdr_reserve_space(xdr, 4);
2543                 if (!p)
2544                         goto out_resource;
2545                 *p++ = cpu_to_be32(0);
2546         }
2547         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2548                 p = xdr_reserve_space(xdr, 4);
2549                 if (!p)
2550                         goto out_resource;
2551                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2552         }
2553         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2554                 p = xdr_reserve_space(xdr, 4);
2555                 if (!p)
2556                         goto out_resource;
2557                 *p++ = cpu_to_be32(rdattr_err);
2558         }
2559         if (bmval0 & FATTR4_WORD0_ACL) {
2560                 struct nfs4_ace *ace;
2561
2562                 if (acl == NULL) {
2563                         p = xdr_reserve_space(xdr, 4);
2564                         if (!p)
2565                                 goto out_resource;
2566
2567                         *p++ = cpu_to_be32(0);
2568                         goto out_acl;
2569                 }
2570                 p = xdr_reserve_space(xdr, 4);
2571                 if (!p)
2572                         goto out_resource;
2573                 *p++ = cpu_to_be32(acl->naces);
2574
2575                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2576                         p = xdr_reserve_space(xdr, 4*3);
2577                         if (!p)
2578                                 goto out_resource;
2579                         *p++ = cpu_to_be32(ace->type);
2580                         *p++ = cpu_to_be32(ace->flag);
2581                         *p++ = cpu_to_be32(ace->access_mask &
2582                                                         NFS4_ACE_MASK_ALL);
2583                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2584                         if (status)
2585                                 goto out;
2586                 }
2587         }
2588 out_acl:
2589         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2590                 p = xdr_reserve_space(xdr, 4);
2591                 if (!p)
2592                         goto out_resource;
2593                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2594                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2595         }
2596         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2597                 p = xdr_reserve_space(xdr, 4);
2598                 if (!p)
2599                         goto out_resource;
2600                 *p++ = cpu_to_be32(1);
2601         }
2602         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2603                 p = xdr_reserve_space(xdr, 4);
2604                 if (!p)
2605                         goto out_resource;
2606                 *p++ = cpu_to_be32(0);
2607         }
2608         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2609                 p = xdr_reserve_space(xdr, 4);
2610                 if (!p)
2611                         goto out_resource;
2612                 *p++ = cpu_to_be32(1);
2613         }
2614         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2615                 p = xdr_reserve_space(xdr, 4);
2616                 if (!p)
2617                         goto out_resource;
2618                 *p++ = cpu_to_be32(1);
2619         }
2620         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2621                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2622                 if (!p)
2623                         goto out_resource;
2624                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2625                                         fhp->fh_handle.fh_size);
2626         }
2627         if (bmval0 & FATTR4_WORD0_FILEID) {
2628                 p = xdr_reserve_space(xdr, 8);
2629                 if (!p)
2630                         goto out_resource;
2631                 p = xdr_encode_hyper(p, stat.ino);
2632         }
2633         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2634                 p = xdr_reserve_space(xdr, 8);
2635                 if (!p)
2636                         goto out_resource;
2637                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2638         }
2639         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2640                 p = xdr_reserve_space(xdr, 8);
2641                 if (!p)
2642                         goto out_resource;
2643                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2644         }
2645         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2646                 p = xdr_reserve_space(xdr, 8);
2647                 if (!p)
2648                         goto out_resource;
2649                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2650         }
2651         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2652                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2653                 if (status)
2654                         goto out;
2655         }
2656         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2657                 p = xdr_reserve_space(xdr, 4);
2658                 if (!p)
2659                         goto out_resource;
2660                 *p++ = cpu_to_be32(1);
2661         }
2662         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2663                 p = xdr_reserve_space(xdr, 8);
2664                 if (!p)
2665                         goto out_resource;
2666                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2667         }
2668         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2669                 p = xdr_reserve_space(xdr, 4);
2670                 if (!p)
2671                         goto out_resource;
2672                 *p++ = cpu_to_be32(255);
2673         }
2674         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2675                 p = xdr_reserve_space(xdr, 4);
2676                 if (!p)
2677                         goto out_resource;
2678                 *p++ = cpu_to_be32(statfs.f_namelen);
2679         }
2680         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2681                 p = xdr_reserve_space(xdr, 8);
2682                 if (!p)
2683                         goto out_resource;
2684                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2685         }
2686         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2687                 p = xdr_reserve_space(xdr, 8);
2688                 if (!p)
2689                         goto out_resource;
2690                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2691         }
2692         if (bmval1 & FATTR4_WORD1_MODE) {
2693                 p = xdr_reserve_space(xdr, 4);
2694                 if (!p)
2695                         goto out_resource;
2696                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2697         }
2698         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2699                 p = xdr_reserve_space(xdr, 4);
2700                 if (!p)
2701                         goto out_resource;
2702                 *p++ = cpu_to_be32(1);
2703         }
2704         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2705                 p = xdr_reserve_space(xdr, 4);
2706                 if (!p)
2707                         goto out_resource;
2708                 *p++ = cpu_to_be32(stat.nlink);
2709         }
2710         if (bmval1 & FATTR4_WORD1_OWNER) {
2711                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2712                 if (status)
2713                         goto out;
2714         }
2715         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2716                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2717                 if (status)
2718                         goto out;
2719         }
2720         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2721                 p = xdr_reserve_space(xdr, 8);
2722                 if (!p)
2723                         goto out_resource;
2724                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2725                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2726         }
2727         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2728                 p = xdr_reserve_space(xdr, 8);
2729                 if (!p)
2730                         goto out_resource;
2731                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2732                 p = xdr_encode_hyper(p, dummy64);
2733         }
2734         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2735                 p = xdr_reserve_space(xdr, 8);
2736                 if (!p)
2737                         goto out_resource;
2738                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2739                 p = xdr_encode_hyper(p, dummy64);
2740         }
2741         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2742                 p = xdr_reserve_space(xdr, 8);
2743                 if (!p)
2744                         goto out_resource;
2745                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2746                 p = xdr_encode_hyper(p, dummy64);
2747         }
2748         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2749                 p = xdr_reserve_space(xdr, 8);
2750                 if (!p)
2751                         goto out_resource;
2752                 dummy64 = (u64)stat.blocks << 9;
2753                 p = xdr_encode_hyper(p, dummy64);
2754         }
2755         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2756                 p = xdr_reserve_space(xdr, 12);
2757                 if (!p)
2758                         goto out_resource;
2759                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2760                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2761         }
2762         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2763                 p = xdr_reserve_space(xdr, 12);
2764                 if (!p)
2765                         goto out_resource;
2766                 *p++ = cpu_to_be32(0);
2767                 *p++ = cpu_to_be32(1);
2768                 *p++ = cpu_to_be32(0);
2769         }
2770         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2771                 p = xdr_reserve_space(xdr, 12);
2772                 if (!p)
2773                         goto out_resource;
2774                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2775                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2776         }
2777         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2778                 p = xdr_reserve_space(xdr, 12);
2779                 if (!p)
2780                         goto out_resource;
2781                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2782                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2783         }
2784         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2785                 struct kstat parent_stat;
2786                 u64 ino = stat.ino;
2787
2788                 p = xdr_reserve_space(xdr, 8);
2789                 if (!p)
2790                         goto out_resource;
2791                 /*
2792                  * Get parent's attributes if not ignoring crossmount
2793                  * and this is the root of a cross-mounted filesystem.
2794                  */
2795                 if (ignore_crossmnt == 0 &&
2796                     dentry == exp->ex_path.mnt->mnt_root) {
2797                         err = get_parent_attributes(exp, &parent_stat);
2798                         if (err)
2799                                 goto out_nfserr;
2800                         ino = parent_stat.ino;
2801                 }
2802                 p = xdr_encode_hyper(p, ino);
2803         }
2804 #ifdef CONFIG_NFSD_PNFS
2805         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2806                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2807                 if (status)
2808                         goto out;
2809         }
2810
2811         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2812                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2813                 if (status)
2814                         goto out;
2815         }
2816
2817         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2818                 p = xdr_reserve_space(xdr, 4);
2819                 if (!p)
2820                         goto out_resource;
2821                 *p++ = cpu_to_be32(stat.blksize);
2822         }
2823 #endif /* CONFIG_NFSD_PNFS */
2824         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2825                 status = nfsd4_encode_bitmap(xdr, NFSD_SUPPATTR_EXCLCREAT_WORD0,
2826                                                   NFSD_SUPPATTR_EXCLCREAT_WORD1,
2827                                                   NFSD_SUPPATTR_EXCLCREAT_WORD2);
2828                 if (status)
2829                         goto out;
2830         }
2831
2832         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2833                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2834                                                                 contextlen);
2835                 if (status)
2836                         goto out;
2837         }
2838
2839         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2840         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2841         status = nfs_ok;
2842
2843 out:
2844 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2845         if (context)
2846                 security_release_secctx(context, contextlen);
2847 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2848         kfree(acl);
2849         if (tempfh) {
2850                 fh_put(tempfh);
2851                 kfree(tempfh);
2852         }
2853         if (status)
2854                 xdr_truncate_encode(xdr, starting_len);
2855         return status;
2856 out_nfserr:
2857         status = nfserrno(err);
2858         goto out;
2859 out_resource:
2860         status = nfserr_resource;
2861         goto out;
2862 }
2863
2864 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2865                                 struct xdr_buf *buf, __be32 *p, int bytes)
2866 {
2867         xdr->scratch.iov_len = 0;
2868         memset(buf, 0, sizeof(struct xdr_buf));
2869         buf->head[0].iov_base = p;
2870         buf->head[0].iov_len = 0;
2871         buf->len = 0;
2872         xdr->buf = buf;
2873         xdr->iov = buf->head;
2874         xdr->p = p;
2875         xdr->end = (void *)p + bytes;
2876         buf->buflen = bytes;
2877 }
2878
2879 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2880                         struct svc_fh *fhp, struct svc_export *exp,
2881                         struct dentry *dentry, u32 *bmval,
2882                         struct svc_rqst *rqstp, int ignore_crossmnt)
2883 {
2884         struct xdr_buf dummy;
2885         struct xdr_stream xdr;
2886         __be32 ret;
2887
2888         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2889         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2890                                                         ignore_crossmnt);
2891         *p = xdr.p;
2892         return ret;
2893 }
2894
2895 static inline int attributes_need_mount(u32 *bmval)
2896 {
2897         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2898                 return 1;
2899         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2900                 return 1;
2901         return 0;
2902 }
2903
2904 static __be32
2905 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2906                         const char *name, int namlen)
2907 {
2908         struct svc_export *exp = cd->rd_fhp->fh_export;
2909         struct dentry *dentry;
2910         __be32 nfserr;
2911         int ignore_crossmnt = 0;
2912
2913         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2914         if (IS_ERR(dentry))
2915                 return nfserrno(PTR_ERR(dentry));
2916         if (d_really_is_negative(dentry)) {
2917                 /*
2918                  * we're not holding the i_mutex here, so there's
2919                  * a window where this directory entry could have gone
2920                  * away.
2921                  */
2922                 dput(dentry);
2923                 return nfserr_noent;
2924         }
2925
2926         exp_get(exp);
2927         /*
2928          * In the case of a mountpoint, the client may be asking for
2929          * attributes that are only properties of the underlying filesystem
2930          * as opposed to the cross-mounted file system. In such a case,
2931          * we will not follow the cross mount and will fill the attribtutes
2932          * directly from the mountpoint dentry.
2933          */
2934         if (nfsd_mountpoint(dentry, exp)) {
2935                 int err;
2936
2937                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2938                                 && !attributes_need_mount(cd->rd_bmval)) {
2939                         ignore_crossmnt = 1;
2940                         goto out_encode;
2941                 }
2942                 /*
2943                  * Why the heck aren't we just using nfsd_lookup??
2944                  * Different "."/".." handling?  Something else?
2945                  * At least, add a comment here to explain....
2946                  */
2947                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2948                 if (err) {
2949                         nfserr = nfserrno(err);
2950                         goto out_put;
2951                 }
2952                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2953                 if (nfserr)
2954                         goto out_put;
2955
2956         }
2957 out_encode:
2958         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2959                                         cd->rd_rqstp, ignore_crossmnt);
2960 out_put:
2961         dput(dentry);
2962         exp_put(exp);
2963         return nfserr;
2964 }
2965
2966 static __be32 *
2967 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2968 {
2969         __be32 *p;
2970
2971         p = xdr_reserve_space(xdr, 20);
2972         if (!p)
2973                 return NULL;
2974         *p++ = htonl(2);
2975         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2976         *p++ = htonl(0);                         /* bmval1 */
2977
2978         *p++ = htonl(4);     /* attribute length */
2979         *p++ = nfserr;       /* no htonl */
2980         return p;
2981 }
2982
2983 static int
2984 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2985                     loff_t offset, u64 ino, unsigned int d_type)
2986 {
2987         struct readdir_cd *ccd = ccdv;
2988         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2989         struct xdr_stream *xdr = cd->xdr;
2990         int start_offset = xdr->buf->len;
2991         int cookie_offset;
2992         u32 name_and_cookie;
2993         int entry_bytes;
2994         __be32 nfserr = nfserr_toosmall;
2995         __be64 wire_offset;
2996         __be32 *p;
2997
2998         /* In nfsv4, "." and ".." never make it onto the wire.. */
2999         if (name && isdotent(name, namlen)) {
3000                 cd->common.err = nfs_ok;
3001                 return 0;
3002         }
3003
3004         if (cd->cookie_offset) {
3005                 wire_offset = cpu_to_be64(offset);
3006                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3007                                                         &wire_offset, 8);
3008         }
3009
3010         p = xdr_reserve_space(xdr, 4);
3011         if (!p)
3012                 goto fail;
3013         *p++ = xdr_one;                             /* mark entry present */
3014         cookie_offset = xdr->buf->len;
3015         p = xdr_reserve_space(xdr, 3*4 + namlen);
3016         if (!p)
3017                 goto fail;
3018         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3019         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3020
3021         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3022         switch (nfserr) {
3023         case nfs_ok:
3024                 break;
3025         case nfserr_resource:
3026                 nfserr = nfserr_toosmall;
3027                 goto fail;
3028         case nfserr_noent:
3029                 xdr_truncate_encode(xdr, start_offset);
3030                 goto skip_entry;
3031         default:
3032                 /*
3033                  * If the client requested the RDATTR_ERROR attribute,
3034                  * we stuff the error code into this attribute
3035                  * and continue.  If this attribute was not requested,
3036                  * then in accordance with the spec, we fail the
3037                  * entire READDIR operation(!)
3038                  */
3039                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3040                         goto fail;
3041                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3042                 if (p == NULL) {
3043                         nfserr = nfserr_toosmall;
3044                         goto fail;
3045                 }
3046         }
3047         nfserr = nfserr_toosmall;
3048         entry_bytes = xdr->buf->len - start_offset;
3049         if (entry_bytes > cd->rd_maxcount)
3050                 goto fail;
3051         cd->rd_maxcount -= entry_bytes;
3052         /*
3053          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3054          * let's always let through the first entry, at least:
3055          */
3056         if (!cd->rd_dircount)
3057                 goto fail;
3058         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3059         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3060                 goto fail;
3061         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3062
3063         cd->cookie_offset = cookie_offset;
3064 skip_entry:
3065         cd->common.err = nfs_ok;
3066         return 0;
3067 fail:
3068         xdr_truncate_encode(xdr, start_offset);
3069         cd->common.err = nfserr;
3070         return -EINVAL;
3071 }
3072
3073 static __be32
3074 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3075 {
3076         __be32 *p;
3077
3078         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3079         if (!p)
3080                 return nfserr_resource;
3081         *p++ = cpu_to_be32(sid->si_generation);
3082         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3083                                         sizeof(stateid_opaque_t));
3084         return 0;
3085 }
3086
3087 static __be32
3088 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3089 {
3090         struct xdr_stream *xdr = &resp->xdr;
3091         __be32 *p;
3092
3093         if (!nfserr) {
3094                 p = xdr_reserve_space(xdr, 8);
3095                 if (!p)
3096                         return nfserr_resource;
3097                 *p++ = cpu_to_be32(access->ac_supported);
3098                 *p++ = cpu_to_be32(access->ac_resp_access);
3099         }
3100         return nfserr;
3101 }
3102
3103 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3104 {
3105         struct xdr_stream *xdr = &resp->xdr;
3106         __be32 *p;
3107
3108         if (!nfserr) {
3109                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3110                 if (!p)
3111                         return nfserr_resource;
3112                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3113                                                 NFS4_MAX_SESSIONID_LEN);
3114                 *p++ = cpu_to_be32(bcts->dir);
3115                 /* Upshifting from TCP to RDMA is not supported */
3116                 *p++ = cpu_to_be32(0);
3117         }
3118         return nfserr;
3119 }
3120
3121 static __be32
3122 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3123 {
3124         struct xdr_stream *xdr = &resp->xdr;
3125
3126         if (!nfserr)
3127                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3128
3129         return nfserr;
3130 }
3131
3132
3133 static __be32
3134 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3135 {
3136         struct xdr_stream *xdr = &resp->xdr;
3137         __be32 *p;
3138
3139         if (!nfserr) {
3140                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3141                 if (!p)
3142                         return nfserr_resource;
3143                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3144                                                 NFS4_VERIFIER_SIZE);
3145         }
3146         return nfserr;
3147 }
3148
3149 static __be32
3150 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3151 {
3152         struct xdr_stream *xdr = &resp->xdr;
3153         __be32 *p;
3154
3155         if (!nfserr) {
3156                 p = xdr_reserve_space(xdr, 20);
3157                 if (!p)
3158                         return nfserr_resource;
3159                 encode_cinfo(p, &create->cr_cinfo);
3160                 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3161                                 create->cr_bmval[1], create->cr_bmval[2]);
3162         }
3163         return nfserr;
3164 }
3165
3166 static __be32
3167 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3168 {
3169         struct svc_fh *fhp = getattr->ga_fhp;
3170         struct xdr_stream *xdr = &resp->xdr;
3171
3172         if (nfserr)
3173                 return nfserr;
3174
3175         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3176                                     getattr->ga_bmval,
3177                                     resp->rqstp, 0);
3178         return nfserr;
3179 }
3180
3181 static __be32
3182 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3183 {
3184         struct xdr_stream *xdr = &resp->xdr;
3185         struct svc_fh *fhp = *fhpp;
3186         unsigned int len;
3187         __be32 *p;
3188
3189         if (!nfserr) {
3190                 len = fhp->fh_handle.fh_size;
3191                 p = xdr_reserve_space(xdr, len + 4);
3192                 if (!p)
3193                         return nfserr_resource;
3194                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3195         }
3196         return nfserr;
3197 }
3198
3199 /*
3200 * Including all fields other than the name, a LOCK4denied structure requires
3201 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3202 */
3203 static __be32
3204 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3205 {
3206         struct xdr_netobj *conf = &ld->ld_owner;
3207         __be32 *p;
3208
3209 again:
3210         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3211         if (!p) {
3212                 /*
3213                  * Don't fail to return the result just because we can't
3214                  * return the conflicting open:
3215                  */
3216                 if (conf->len) {
3217                         kfree(conf->data);
3218                         conf->len = 0;
3219                         conf->data = NULL;
3220                         goto again;
3221                 }
3222                 return nfserr_resource;
3223         }
3224         p = xdr_encode_hyper(p, ld->ld_start);
3225         p = xdr_encode_hyper(p, ld->ld_length);
3226         *p++ = cpu_to_be32(ld->ld_type);
3227         if (conf->len) {
3228                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3229                 p = xdr_encode_opaque(p, conf->data, conf->len);
3230                 kfree(conf->data);
3231         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3232                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3233                 *p++ = cpu_to_be32(0); /* length of owner name */
3234         }
3235         return nfserr_denied;
3236 }
3237
3238 static __be32
3239 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3240 {
3241         struct xdr_stream *xdr = &resp->xdr;
3242
3243         if (!nfserr)
3244                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3245         else if (nfserr == nfserr_denied)
3246                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3247
3248         return nfserr;
3249 }
3250
3251 static __be32
3252 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3253 {
3254         struct xdr_stream *xdr = &resp->xdr;
3255
3256         if (nfserr == nfserr_denied)
3257                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3258         return nfserr;
3259 }
3260
3261 static __be32
3262 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3263 {
3264         struct xdr_stream *xdr = &resp->xdr;
3265
3266         if (!nfserr)
3267                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3268
3269         return nfserr;
3270 }
3271
3272
3273 static __be32
3274 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3275 {
3276         struct xdr_stream *xdr = &resp->xdr;
3277         __be32 *p;
3278
3279         if (!nfserr) {
3280                 p = xdr_reserve_space(xdr, 20);
3281                 if (!p)
3282                         return nfserr_resource;
3283                 p = encode_cinfo(p, &link->li_cinfo);
3284         }
3285         return nfserr;
3286 }
3287
3288
3289 static __be32
3290 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3291 {
3292         struct xdr_stream *xdr = &resp->xdr;
3293         __be32 *p;
3294
3295         if (nfserr)
3296                 goto out;
3297
3298         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3299         if (nfserr)
3300                 goto out;
3301         p = xdr_reserve_space(xdr, 24);
3302         if (!p)
3303                 return nfserr_resource;
3304         p = encode_cinfo(p, &open->op_cinfo);
3305         *p++ = cpu_to_be32(open->op_rflags);
3306
3307         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3308                                         open->op_bmval[2]);
3309         if (nfserr)
3310                 goto out;
3311
3312         p = xdr_reserve_space(xdr, 4);
3313         if (!p)
3314                 return nfserr_resource;
3315
3316         *p++ = cpu_to_be32(open->op_delegate_type);
3317         switch (open->op_delegate_type) {
3318         case NFS4_OPEN_DELEGATE_NONE:
3319                 break;
3320         case NFS4_OPEN_DELEGATE_READ:
3321                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3322                 if (nfserr)
3323                         return nfserr;
3324                 p = xdr_reserve_space(xdr, 20);
3325                 if (!p)
3326                         return nfserr_resource;
3327                 *p++ = cpu_to_be32(open->op_recall);
3328
3329                 /*
3330                  * TODO: ACE's in delegations
3331                  */
3332                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3333                 *p++ = cpu_to_be32(0);
3334                 *p++ = cpu_to_be32(0);
3335                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3336                 break;
3337         case NFS4_OPEN_DELEGATE_WRITE:
3338                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3339                 if (nfserr)
3340                         return nfserr;
3341                 p = xdr_reserve_space(xdr, 32);
3342                 if (!p)
3343                         return nfserr_resource;
3344                 *p++ = cpu_to_be32(0);
3345
3346                 /*
3347                  * TODO: space_limit's in delegations
3348                  */
3349                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3350                 *p++ = cpu_to_be32(~(u32)0);
3351                 *p++ = cpu_to_be32(~(u32)0);
3352
3353                 /*
3354                  * TODO: ACE's in delegations
3355                  */
3356                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3357                 *p++ = cpu_to_be32(0);
3358                 *p++ = cpu_to_be32(0);
3359                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3360                 break;
3361         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3362                 switch (open->op_why_no_deleg) {
3363                 case WND4_CONTENTION:
3364                 case WND4_RESOURCE:
3365                         p = xdr_reserve_space(xdr, 8);
3366                         if (!p)
3367                                 return nfserr_resource;
3368                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3369                         /* deleg signaling not supported yet: */
3370                         *p++ = cpu_to_be32(0);
3371                         break;
3372                 default:
3373                         p = xdr_reserve_space(xdr, 4);
3374                         if (!p)
3375                                 return nfserr_resource;
3376                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3377                 }
3378                 break;
3379         default:
3380                 BUG();
3381         }
3382         /* XXX save filehandle here */
3383 out:
3384         return nfserr;
3385 }
3386
3387 static __be32
3388 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3389 {
3390         struct xdr_stream *xdr = &resp->xdr;
3391
3392         if (!nfserr)
3393                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3394
3395         return nfserr;
3396 }
3397
3398 static __be32
3399 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3400 {
3401         struct xdr_stream *xdr = &resp->xdr;
3402
3403         if (!nfserr)
3404                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3405
3406         return nfserr;
3407 }
3408
3409 static __be32 nfsd4_encode_splice_read(
3410                                 struct nfsd4_compoundres *resp,
3411                                 struct nfsd4_read *read,
3412                                 struct file *file, unsigned long maxcount)
3413 {
3414         struct xdr_stream *xdr = &resp->xdr;
3415         struct xdr_buf *buf = xdr->buf;
3416         u32 eof;
3417         long len;
3418         int space_left;
3419         __be32 nfserr;
3420         __be32 *p = xdr->p - 2;
3421
3422         /* Make sure there will be room for padding if needed */
3423         if (xdr->end - xdr->p < 1)
3424                 return nfserr_resource;
3425
3426         len = maxcount;
3427         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3428                                   read->rd_offset, &maxcount);
3429         if (nfserr) {
3430                 /*
3431                  * nfsd_splice_actor may have already messed with the
3432                  * page length; reset it so as not to confuse
3433                  * xdr_truncate_encode:
3434                  */
3435                 buf->page_len = 0;
3436                 return nfserr;
3437         }
3438
3439         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3440                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3441
3442         *(p++) = htonl(eof);
3443         *(p++) = htonl(maxcount);
3444
3445         buf->page_len = maxcount;
3446         buf->len += maxcount;
3447         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3448                                                         / PAGE_SIZE;
3449
3450         /* Use rest of head for padding and remaining ops: */
3451         buf->tail[0].iov_base = xdr->p;
3452         buf->tail[0].iov_len = 0;
3453         xdr->iov = buf->tail;
3454         if (maxcount&3) {
3455                 int pad = 4 - (maxcount&3);
3456
3457                 *(xdr->p++) = 0;
3458
3459                 buf->tail[0].iov_base += maxcount&3;
3460                 buf->tail[0].iov_len = pad;
3461                 buf->len += pad;
3462         }
3463
3464         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3465                                 buf->buflen - buf->len);
3466         buf->buflen = buf->len + space_left;
3467         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3468
3469         return 0;
3470 }
3471
3472 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3473                                  struct nfsd4_read *read,
3474                                  struct file *file, unsigned long maxcount)
3475 {
3476         struct xdr_stream *xdr = &resp->xdr;
3477         u32 eof;
3478         int v;
3479         int starting_len = xdr->buf->len - 8;
3480         long len;
3481         int thislen;
3482         __be32 nfserr;
3483         __be32 tmp;
3484         __be32 *p;
3485         u32 zzz = 0;
3486         int pad;
3487
3488         len = maxcount;
3489         v = 0;
3490
3491         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3492         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3493         WARN_ON_ONCE(!p);
3494         resp->rqstp->rq_vec[v].iov_base = p;
3495         resp->rqstp->rq_vec[v].iov_len = thislen;
3496         v++;
3497         len -= thislen;
3498
3499         while (len) {
3500                 thislen = min_t(long, len, PAGE_SIZE);
3501                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3502                 WARN_ON_ONCE(!p);
3503                 resp->rqstp->rq_vec[v].iov_base = p;
3504                 resp->rqstp->rq_vec[v].iov_len = thislen;
3505                 v++;
3506                 len -= thislen;
3507         }
3508         read->rd_vlen = v;
3509
3510         len = maxcount;
3511         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3512                         read->rd_vlen, &maxcount);
3513         if (nfserr)
3514                 return nfserr;
3515         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3516
3517         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3518                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3519
3520         tmp = htonl(eof);
3521         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3522         tmp = htonl(maxcount);
3523         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3524
3525         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3526         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3527                                                                 &zzz, pad);
3528         return 0;
3529
3530 }
3531
3532 static __be32
3533 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3534                   struct nfsd4_read *read)
3535 {
3536         unsigned long maxcount;
3537         struct xdr_stream *xdr = &resp->xdr;
3538         struct file *file = read->rd_filp;
3539         int starting_len = xdr->buf->len;
3540         struct raparms *ra = NULL;
3541         __be32 *p;
3542
3543         if (nfserr)
3544                 goto out;
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                 nfserr = nfserr_resource;
3550                 goto out;
3551         }
3552         if (resp->xdr.buf->page_len &&
3553             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3554                 WARN_ON_ONCE(1);
3555                 nfserr = nfserr_resource;
3556                 goto out;
3557         }
3558         xdr_commit_encode(xdr);
3559
3560         maxcount = svc_max_payload(resp->rqstp);
3561         maxcount = min_t(unsigned long, maxcount,
3562                          (xdr->buf->buflen - xdr->buf->len));
3563         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3564
3565         if (read->rd_tmp_file)
3566                 ra = nfsd_init_raparms(file);
3567
3568         if (file->f_op->splice_read &&
3569             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3570                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3571         else
3572                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3573
3574         if (ra)
3575                 nfsd_put_raparams(file, ra);
3576
3577         if (nfserr)
3578                 xdr_truncate_encode(xdr, starting_len);
3579
3580 out:
3581         if (file)
3582                 fput(file);
3583         return nfserr;
3584 }
3585
3586 static __be32
3587 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3588 {
3589         int maxcount;
3590         __be32 wire_count;
3591         int zero = 0;
3592         struct xdr_stream *xdr = &resp->xdr;
3593         int length_offset = xdr->buf->len;
3594         __be32 *p;
3595
3596         if (nfserr)
3597                 return nfserr;
3598
3599         p = xdr_reserve_space(xdr, 4);
3600         if (!p)
3601                 return nfserr_resource;
3602         maxcount = PAGE_SIZE;
3603
3604         p = xdr_reserve_space(xdr, maxcount);
3605         if (!p)
3606                 return nfserr_resource;
3607         /*
3608          * XXX: By default, vfs_readlink() will truncate symlinks if they
3609          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
3610          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3611          * that truncation occurred, and return NFS4ERR_RESOURCE.
3612          */
3613         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3614                                                 (char *)p, &maxcount);
3615         if (nfserr == nfserr_isdir)
3616                 nfserr = nfserr_inval;
3617         if (nfserr) {
3618                 xdr_truncate_encode(xdr, length_offset);
3619                 return nfserr;
3620         }
3621
3622         wire_count = htonl(maxcount);
3623         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3624         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3625         if (maxcount & 3)
3626                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3627                                                 &zero, 4 - (maxcount&3));
3628         return 0;
3629 }
3630
3631 static __be32
3632 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3633 {
3634         int maxcount;
3635         int bytes_left;
3636         loff_t offset;
3637         __be64 wire_offset;
3638         struct xdr_stream *xdr = &resp->xdr;
3639         int starting_len = xdr->buf->len;
3640         __be32 *p;
3641
3642         if (nfserr)
3643                 return nfserr;
3644
3645         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3646         if (!p)
3647                 return nfserr_resource;
3648
3649         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3650         *p++ = cpu_to_be32(0);
3651         *p++ = cpu_to_be32(0);
3652         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3653                                 - (char *)resp->xdr.buf->head[0].iov_base;
3654
3655         /*
3656          * Number of bytes left for directory entries allowing for the
3657          * final 8 bytes of the readdir and a following failed op:
3658          */
3659         bytes_left = xdr->buf->buflen - xdr->buf->len
3660                         - COMPOUND_ERR_SLACK_SPACE - 8;
3661         if (bytes_left < 0) {
3662                 nfserr = nfserr_resource;
3663                 goto err_no_verf;
3664         }
3665         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3666         /*
3667          * Note the rfc defines rd_maxcount as the size of the
3668          * READDIR4resok structure, which includes the verifier above
3669          * and the 8 bytes encoded at the end of this function:
3670          */
3671         if (maxcount < 16) {
3672                 nfserr = nfserr_toosmall;
3673                 goto err_no_verf;
3674         }
3675         maxcount = min_t(int, maxcount-16, bytes_left);
3676
3677         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3678         if (!readdir->rd_dircount)
3679                 readdir->rd_dircount = INT_MAX;
3680
3681         readdir->xdr = xdr;
3682         readdir->rd_maxcount = maxcount;
3683         readdir->common.err = 0;
3684         readdir->cookie_offset = 0;
3685
3686         offset = readdir->rd_cookie;
3687         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3688                               &offset,
3689                               &readdir->common, nfsd4_encode_dirent);
3690         if (nfserr == nfs_ok &&
3691             readdir->common.err == nfserr_toosmall &&
3692             xdr->buf->len == starting_len + 8) {
3693                 /* nothing encoded; which limit did we hit?: */
3694                 if (maxcount - 16 < bytes_left)
3695                         /* It was the fault of rd_maxcount: */
3696                         nfserr = nfserr_toosmall;
3697                 else
3698                         /* We ran out of buffer space: */
3699                         nfserr = nfserr_resource;
3700         }
3701         if (nfserr)
3702                 goto err_no_verf;
3703
3704         if (readdir->cookie_offset) {
3705                 wire_offset = cpu_to_be64(offset);
3706                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3707                                                         &wire_offset, 8);
3708         }
3709
3710         p = xdr_reserve_space(xdr, 8);
3711         if (!p) {
3712                 WARN_ON_ONCE(1);
3713                 goto err_no_verf;
3714         }
3715         *p++ = 0;       /* no more entries */
3716         *p++ = htonl(readdir->common.err == nfserr_eof);
3717
3718         return 0;
3719 err_no_verf:
3720         xdr_truncate_encode(xdr, starting_len);
3721         return nfserr;
3722 }
3723
3724 static __be32
3725 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3726 {
3727         struct xdr_stream *xdr = &resp->xdr;
3728         __be32 *p;
3729
3730         if (!nfserr) {
3731                 p = xdr_reserve_space(xdr, 20);
3732                 if (!p)
3733                         return nfserr_resource;
3734                 p = encode_cinfo(p, &remove->rm_cinfo);
3735         }
3736         return nfserr;
3737 }
3738
3739 static __be32
3740 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3741 {
3742         struct xdr_stream *xdr = &resp->xdr;
3743         __be32 *p;
3744
3745         if (!nfserr) {
3746                 p = xdr_reserve_space(xdr, 40);
3747                 if (!p)
3748                         return nfserr_resource;
3749                 p = encode_cinfo(p, &rename->rn_sinfo);
3750                 p = encode_cinfo(p, &rename->rn_tinfo);
3751         }
3752         return nfserr;
3753 }
3754
3755 static __be32
3756 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3757                          __be32 nfserr, struct svc_export *exp)
3758 {
3759         u32 i, nflavs, supported;
3760         struct exp_flavor_info *flavs;
3761         struct exp_flavor_info def_flavs[2];
3762         __be32 *p, *flavorsp;
3763         static bool report = true;
3764
3765         if (nfserr)
3766                 goto out;
3767         nfserr = nfserr_resource;
3768         if (exp->ex_nflavors) {
3769                 flavs = exp->ex_flavors;
3770                 nflavs = exp->ex_nflavors;
3771         } else { /* Handling of some defaults in absence of real secinfo: */
3772                 flavs = def_flavs;
3773                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3774                         nflavs = 2;
3775                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3776                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3777                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3778                         nflavs = 1;
3779                         flavs[0].pseudoflavor
3780                                         = svcauth_gss_flavor(exp->ex_client);
3781                 } else {
3782                         nflavs = 1;
3783                         flavs[0].pseudoflavor
3784                                         = exp->ex_client->flavour->flavour;
3785                 }
3786         }
3787
3788         supported = 0;
3789         p = xdr_reserve_space(xdr, 4);
3790         if (!p)
3791                 goto out;
3792         flavorsp = p++;         /* to be backfilled later */
3793
3794         for (i = 0; i < nflavs; i++) {
3795                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3796                 struct rpcsec_gss_info info;
3797
3798                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3799                         supported++;
3800                         p = xdr_reserve_space(xdr, 4 + 4 +
3801                                               XDR_LEN(info.oid.len) + 4 + 4);
3802                         if (!p)
3803                                 goto out;
3804                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3805                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3806                         *p++ = cpu_to_be32(info.qop);
3807                         *p++ = cpu_to_be32(info.service);
3808                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3809                         supported++;
3810                         p = xdr_reserve_space(xdr, 4);
3811                         if (!p)
3812                                 goto out;
3813                         *p++ = cpu_to_be32(pf);
3814                 } else {
3815                         if (report)
3816                                 pr_warn("NFS: SECINFO: security flavor %u "
3817                                         "is not supported\n", pf);
3818                 }
3819         }
3820
3821         if (nflavs != supported)
3822                 report = false;
3823         *flavorsp = htonl(supported);
3824         nfserr = 0;
3825 out:
3826         if (exp)
3827                 exp_put(exp);
3828         return nfserr;
3829 }
3830
3831 static __be32
3832 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3833                      struct nfsd4_secinfo *secinfo)
3834 {
3835         struct xdr_stream *xdr = &resp->xdr;
3836
3837         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3838 }
3839
3840 static __be32
3841 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3842                      struct nfsd4_secinfo_no_name *secinfo)
3843 {
3844         struct xdr_stream *xdr = &resp->xdr;
3845
3846         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3847 }
3848
3849 /*
3850  * The SETATTR encode routine is special -- it always encodes a bitmap,
3851  * regardless of the error status.
3852  */
3853 static __be32
3854 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3855 {
3856         struct xdr_stream *xdr = &resp->xdr;
3857         __be32 *p;
3858
3859         p = xdr_reserve_space(xdr, 16);
3860         if (!p)
3861                 return nfserr_resource;
3862         if (nfserr) {
3863                 *p++ = cpu_to_be32(3);
3864                 *p++ = cpu_to_be32(0);
3865                 *p++ = cpu_to_be32(0);
3866                 *p++ = cpu_to_be32(0);
3867         }
3868         else {
3869                 *p++ = cpu_to_be32(3);
3870                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3871                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3872                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3873         }
3874         return nfserr;
3875 }
3876
3877 static __be32
3878 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3879 {
3880         struct xdr_stream *xdr = &resp->xdr;
3881         __be32 *p;
3882
3883         if (!nfserr) {
3884                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3885                 if (!p)
3886                         return nfserr_resource;
3887                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3888                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3889                                                 NFS4_VERIFIER_SIZE);
3890         }
3891         else if (nfserr == nfserr_clid_inuse) {
3892                 p = xdr_reserve_space(xdr, 8);
3893                 if (!p)
3894                         return nfserr_resource;
3895                 *p++ = cpu_to_be32(0);
3896                 *p++ = cpu_to_be32(0);
3897         }
3898         return nfserr;
3899 }
3900
3901 static __be32
3902 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3903 {
3904         struct xdr_stream *xdr = &resp->xdr;
3905         __be32 *p;
3906
3907         if (!nfserr) {
3908                 p = xdr_reserve_space(xdr, 16);
3909                 if (!p)
3910                         return nfserr_resource;
3911                 *p++ = cpu_to_be32(write->wr_bytes_written);
3912                 *p++ = cpu_to_be32(write->wr_how_written);
3913                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3914                                                         NFS4_VERIFIER_SIZE);
3915         }
3916         return nfserr;
3917 }
3918
3919 static __be32
3920 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3921                          struct nfsd4_exchange_id *exid)
3922 {
3923         struct xdr_stream *xdr = &resp->xdr;
3924         __be32 *p;
3925         char *major_id;
3926         char *server_scope;
3927         int major_id_sz;
3928         int server_scope_sz;
3929         int status = 0;
3930         uint64_t minor_id = 0;
3931
3932         if (nfserr)
3933                 return nfserr;
3934
3935         major_id = utsname()->nodename;
3936         major_id_sz = strlen(major_id);
3937         server_scope = utsname()->nodename;
3938         server_scope_sz = strlen(server_scope);
3939
3940         p = xdr_reserve_space(xdr,
3941                 8 /* eir_clientid */ +
3942                 4 /* eir_sequenceid */ +
3943                 4 /* eir_flags */ +
3944                 4 /* spr_how */);
3945         if (!p)
3946                 return nfserr_resource;
3947
3948         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3949         *p++ = cpu_to_be32(exid->seqid);
3950         *p++ = cpu_to_be32(exid->flags);
3951
3952         *p++ = cpu_to_be32(exid->spa_how);
3953
3954         switch (exid->spa_how) {
3955         case SP4_NONE:
3956                 break;
3957         case SP4_MACH_CRED:
3958                 /* spo_must_enforce bitmap: */
3959                 status = nfsd4_encode_bitmap(xdr,
3960                                         exid->spo_must_enforce[0],
3961                                         exid->spo_must_enforce[1],
3962                                         exid->spo_must_enforce[2]);
3963                 if (status)
3964                         goto out;
3965                 /* spo_must_allow bitmap: */
3966                 status = nfsd4_encode_bitmap(xdr,
3967                                         exid->spo_must_allow[0],
3968                                         exid->spo_must_allow[1],
3969                                         exid->spo_must_allow[2]);
3970                 if (status)
3971                         goto out;
3972                 break;
3973         default:
3974                 WARN_ON_ONCE(1);
3975         }
3976
3977         p = xdr_reserve_space(xdr,
3978                 8 /* so_minor_id */ +
3979                 4 /* so_major_id.len */ +
3980                 (XDR_QUADLEN(major_id_sz) * 4) +
3981                 4 /* eir_server_scope.len */ +
3982                 (XDR_QUADLEN(server_scope_sz) * 4) +
3983                 4 /* eir_server_impl_id.count (0) */);
3984         if (!p)
3985                 return nfserr_resource;
3986
3987         /* The server_owner struct */
3988         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3989         /* major id */
3990         p = xdr_encode_opaque(p, major_id, major_id_sz);
3991
3992         /* Server scope */
3993         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3994
3995         /* Implementation id */
3996         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3997         return 0;
3998 out:
3999         return status;
4000 }
4001
4002 static __be32
4003 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4004                             struct nfsd4_create_session *sess)
4005 {
4006         struct xdr_stream *xdr = &resp->xdr;
4007         __be32 *p;
4008
4009         if (nfserr)
4010                 return nfserr;
4011
4012         p = xdr_reserve_space(xdr, 24);
4013         if (!p)
4014                 return nfserr_resource;
4015         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4016                                         NFS4_MAX_SESSIONID_LEN);
4017         *p++ = cpu_to_be32(sess->seqid);
4018         *p++ = cpu_to_be32(sess->flags);
4019
4020         p = xdr_reserve_space(xdr, 28);
4021         if (!p)
4022                 return nfserr_resource;
4023         *p++ = cpu_to_be32(0); /* headerpadsz */
4024         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4025         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4026         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4027         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4028         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4029         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4030
4031         if (sess->fore_channel.nr_rdma_attrs) {
4032                 p = xdr_reserve_space(xdr, 4);
4033                 if (!p)
4034                         return nfserr_resource;
4035                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4036         }
4037
4038         p = xdr_reserve_space(xdr, 28);
4039         if (!p)
4040                 return nfserr_resource;
4041         *p++ = cpu_to_be32(0); /* headerpadsz */
4042         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4043         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4044         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4045         *p++ = cpu_to_be32(sess->back_channel.maxops);
4046         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4047         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4048
4049         if (sess->back_channel.nr_rdma_attrs) {
4050                 p = xdr_reserve_space(xdr, 4);
4051                 if (!p)
4052                         return nfserr_resource;
4053                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4054         }
4055         return 0;
4056 }
4057
4058 static __be32
4059 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4060                       struct nfsd4_sequence *seq)
4061 {
4062         struct xdr_stream *xdr = &resp->xdr;
4063         __be32 *p;
4064
4065         if (nfserr)
4066                 return nfserr;
4067
4068         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4069         if (!p)
4070                 return nfserr_resource;
4071         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4072                                         NFS4_MAX_SESSIONID_LEN);
4073         *p++ = cpu_to_be32(seq->seqid);
4074         *p++ = cpu_to_be32(seq->slotid);
4075         /* Note slotid's are numbered from zero: */
4076         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4077         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4078         *p++ = cpu_to_be32(seq->status_flags);
4079
4080         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4081         return 0;
4082 }
4083
4084 static __be32
4085 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4086                           struct nfsd4_test_stateid *test_stateid)
4087 {
4088         struct xdr_stream *xdr = &resp->xdr;
4089         struct nfsd4_test_stateid_id *stateid, *next;
4090         __be32 *p;
4091
4092         if (nfserr)
4093                 return nfserr;
4094
4095         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4096         if (!p)
4097                 return nfserr_resource;
4098         *p++ = htonl(test_stateid->ts_num_ids);
4099
4100         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4101                 *p++ = stateid->ts_id_status;
4102         }
4103
4104         return nfserr;
4105 }
4106
4107 #ifdef CONFIG_NFSD_PNFS
4108 static __be32
4109 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4110                 struct nfsd4_getdeviceinfo *gdev)
4111 {
4112         struct xdr_stream *xdr = &resp->xdr;
4113         const struct nfsd4_layout_ops *ops =
4114                 nfsd4_layout_ops[gdev->gd_layout_type];
4115         u32 starting_len = xdr->buf->len, needed_len;
4116         __be32 *p;
4117
4118         dprintk("%s: err %d\n", __func__, be32_to_cpu(nfserr));
4119         if (nfserr)
4120                 goto out;
4121
4122         nfserr = nfserr_resource;
4123         p = xdr_reserve_space(xdr, 4);
4124         if (!p)
4125                 goto out;
4126
4127         *p++ = cpu_to_be32(gdev->gd_layout_type);
4128
4129         /* If maxcount is 0 then just update notifications */
4130         if (gdev->gd_maxcount != 0) {
4131                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4132                 if (nfserr) {
4133                         /*
4134                          * We don't bother to burden the layout drivers with
4135                          * enforcing gd_maxcount, just tell the client to
4136                          * come back with a bigger buffer if it's not enough.
4137                          */
4138                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4139                                 goto toosmall;
4140                         goto out;
4141                 }
4142         }
4143
4144         nfserr = nfserr_resource;
4145         if (gdev->gd_notify_types) {
4146                 p = xdr_reserve_space(xdr, 4 + 4);
4147                 if (!p)
4148                         goto out;
4149                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4150                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4151         } else {
4152                 p = xdr_reserve_space(xdr, 4);
4153                 if (!p)
4154                         goto out;
4155                 *p++ = 0;
4156         }
4157
4158         nfserr = 0;
4159 out:
4160         kfree(gdev->gd_device);
4161         dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4162         return nfserr;
4163
4164 toosmall:
4165         dprintk("%s: maxcount too small\n", __func__);
4166         needed_len = xdr->buf->len + 4 /* notifications */;
4167         xdr_truncate_encode(xdr, starting_len);
4168         p = xdr_reserve_space(xdr, 4);
4169         if (!p) {
4170                 nfserr = nfserr_resource;
4171         } else {
4172                 *p++ = cpu_to_be32(needed_len);
4173                 nfserr = nfserr_toosmall;
4174         }
4175         goto out;
4176 }
4177
4178 static __be32
4179 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4180                 struct nfsd4_layoutget *lgp)
4181 {
4182         struct xdr_stream *xdr = &resp->xdr;
4183         const struct nfsd4_layout_ops *ops =
4184                 nfsd4_layout_ops[lgp->lg_layout_type];
4185         __be32 *p;
4186
4187         dprintk("%s: err %d\n", __func__, nfserr);
4188         if (nfserr)
4189                 goto out;
4190
4191         nfserr = nfserr_resource;
4192         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4193         if (!p)
4194                 goto out;
4195
4196         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4197         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4198         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4199                                     sizeof(stateid_opaque_t));
4200
4201         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4202         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4203         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4204         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4205         *p++ = cpu_to_be32(lgp->lg_layout_type);
4206
4207         nfserr = ops->encode_layoutget(xdr, lgp);
4208 out:
4209         kfree(lgp->lg_content);
4210         return nfserr;
4211 }
4212
4213 static __be32
4214 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4215                           struct nfsd4_layoutcommit *lcp)
4216 {
4217         struct xdr_stream *xdr = &resp->xdr;
4218         __be32 *p;
4219
4220         if (nfserr)
4221                 return nfserr;
4222
4223         p = xdr_reserve_space(xdr, 4);
4224         if (!p)
4225                 return nfserr_resource;
4226         *p++ = cpu_to_be32(lcp->lc_size_chg);
4227         if (lcp->lc_size_chg) {
4228                 p = xdr_reserve_space(xdr, 8);
4229                 if (!p)
4230                         return nfserr_resource;
4231                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4232         }
4233
4234         return nfs_ok;
4235 }
4236
4237 static __be32
4238 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4239                 struct nfsd4_layoutreturn *lrp)
4240 {
4241         struct xdr_stream *xdr = &resp->xdr;
4242         __be32 *p;
4243
4244         if (nfserr)
4245                 return nfserr;
4246
4247         p = xdr_reserve_space(xdr, 4);
4248         if (!p)
4249                 return nfserr_resource;
4250         *p++ = cpu_to_be32(lrp->lrs_present);
4251         if (lrp->lrs_present)
4252                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4253         return nfs_ok;
4254 }
4255 #endif /* CONFIG_NFSD_PNFS */
4256
4257 static __be32
4258 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4259 {
4260         __be32 *p;
4261
4262         p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4263         if (!p)
4264                 return nfserr_resource;
4265
4266         *p++ = cpu_to_be32(0);
4267         p = xdr_encode_hyper(p, write->wr_bytes_written);
4268         *p++ = cpu_to_be32(write->wr_stable_how);
4269         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4270                                     NFS4_VERIFIER_SIZE);
4271         return nfs_ok;
4272 }
4273
4274 static __be32
4275 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4276                   struct nfsd4_copy *copy)
4277 {
4278         __be32 *p;
4279
4280         if (!nfserr) {
4281                 nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
4282                 if (nfserr)
4283                         return nfserr;
4284
4285                 p = xdr_reserve_space(&resp->xdr, 4 + 4);
4286                 *p++ = cpu_to_be32(copy->cp_consecutive);
4287                 *p++ = cpu_to_be32(copy->cp_synchronous);
4288         }
4289         return nfserr;
4290 }
4291
4292 static __be32
4293 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4294                   struct nfsd4_seek *seek)
4295 {
4296         __be32 *p;
4297
4298         if (nfserr)
4299                 return nfserr;
4300
4301         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4302         *p++ = cpu_to_be32(seek->seek_eof);
4303         p = xdr_encode_hyper(p, seek->seek_pos);
4304
4305         return nfserr;
4306 }
4307
4308 static __be32
4309 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4310 {
4311         return nfserr;
4312 }
4313
4314 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4315
4316 /*
4317  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4318  * since we don't need to filter out obsolete ops as this is
4319  * done in the decoding phase.
4320  */
4321 static nfsd4_enc nfsd4_enc_ops[] = {
4322         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4323         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4324         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4325         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4326         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4327         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4328         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4329         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4330         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4331         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4332         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4333         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4334         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4335         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4336         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4337         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4338         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4339         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4340         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4341         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4342         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4343         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4344         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4345         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4346         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4347         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4348         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4349         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4350         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4351         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4352         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4353         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4354         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4355         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4356         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4357         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4358         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4359
4360         /* NFSv4.1 operations */
4361         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4362         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4363         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4364         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4365         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4366         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4367         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4368 #ifdef CONFIG_NFSD_PNFS
4369         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4370         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4371         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4372         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4373         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4374 #else
4375         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4376         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4377         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4378         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4379         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4380 #endif
4381         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4382         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4383         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4384         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4385         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4386         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4387         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4388
4389         /* NFSv4.2 operations */
4390         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4391         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
4392         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4393         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4394         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4395         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4396         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4397         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4398         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4399         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4400         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4401         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4402         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4403 };
4404
4405 /*
4406  * Calculate whether we still have space to encode repsize bytes.
4407  * There are two considerations:
4408  *     - For NFS versions >=4.1, the size of the reply must stay within
4409  *       session limits
4410  *     - For all NFS versions, we must stay within limited preallocated
4411  *       buffer space.
4412  *
4413  * This is called before the operation is processed, so can only provide
4414  * an upper estimate.  For some nonidempotent operations (such as
4415  * getattr), it's not necessarily a problem if that estimate is wrong,
4416  * as we can fail it after processing without significant side effects.
4417  */
4418 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4419 {
4420         struct xdr_buf *buf = &resp->rqstp->rq_res;
4421         struct nfsd4_slot *slot = resp->cstate.slot;
4422
4423         if (buf->len + respsize <= buf->buflen)
4424                 return nfs_ok;
4425         if (!nfsd4_has_session(&resp->cstate))
4426                 return nfserr_resource;
4427         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4428                 WARN_ON_ONCE(1);
4429                 return nfserr_rep_too_big_to_cache;
4430         }
4431         return nfserr_rep_too_big;
4432 }
4433
4434 void
4435 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4436 {
4437         struct xdr_stream *xdr = &resp->xdr;
4438         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4439         struct svc_rqst *rqstp = resp->rqstp;
4440         int post_err_offset;
4441         nfsd4_enc encoder;
4442         __be32 *p;
4443
4444         p = xdr_reserve_space(xdr, 8);
4445         if (!p) {
4446                 WARN_ON_ONCE(1);
4447                 return;
4448         }
4449         *p++ = cpu_to_be32(op->opnum);
4450         post_err_offset = xdr->buf->len;
4451
4452         if (op->opnum == OP_ILLEGAL)
4453                 goto status;
4454         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4455                !nfsd4_enc_ops[op->opnum]);
4456         encoder = nfsd4_enc_ops[op->opnum];
4457         op->status = encoder(resp, op->status, &op->u);
4458         xdr_commit_encode(xdr);
4459
4460         /* nfsd4_check_resp_size guarantees enough room for error status */
4461         if (!op->status) {
4462                 int space_needed = 0;
4463                 if (!nfsd4_last_compound_op(rqstp))
4464                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4465                 op->status = nfsd4_check_resp_size(resp, space_needed);
4466         }
4467         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4468                 struct nfsd4_slot *slot = resp->cstate.slot;
4469
4470                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4471                         op->status = nfserr_rep_too_big_to_cache;
4472                 else
4473                         op->status = nfserr_rep_too_big;
4474         }
4475         if (op->status == nfserr_resource ||
4476             op->status == nfserr_rep_too_big ||
4477             op->status == nfserr_rep_too_big_to_cache) {
4478                 /*
4479                  * The operation may have already been encoded or
4480                  * partially encoded.  No op returns anything additional
4481                  * in the case of one of these three errors, so we can
4482                  * just truncate back to after the status.  But it's a
4483                  * bug if we had to do this on a non-idempotent op:
4484                  */
4485                 warn_on_nonidempotent_op(op);
4486                 xdr_truncate_encode(xdr, post_err_offset);
4487         }
4488         if (so) {
4489                 int len = xdr->buf->len - post_err_offset;
4490
4491                 so->so_replay.rp_status = op->status;
4492                 so->so_replay.rp_buflen = len;
4493                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4494                                                 so->so_replay.rp_buf, len);
4495         }
4496 status:
4497         /* Note that op->status is already in network byte order: */
4498         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4499 }
4500
4501 /*
4502  * Encode the reply stored in the stateowner reply cache
4503  *
4504  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4505  * previously sent already encoded operation.
4506  */
4507 void
4508 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4509 {
4510         __be32 *p;
4511         struct nfs4_replay *rp = op->replay;
4512
4513         BUG_ON(!rp);
4514
4515         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4516         if (!p) {
4517                 WARN_ON_ONCE(1);
4518                 return;
4519         }
4520         *p++ = cpu_to_be32(op->opnum);
4521         *p++ = rp->rp_status;  /* already xdr'ed */
4522
4523         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4524 }
4525
4526 int
4527 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4528 {
4529         return xdr_ressize_check(rqstp, p);
4530 }
4531
4532 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4533 {
4534         struct svc_rqst *rqstp = rq;
4535         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4536
4537         if (args->ops != args->iops) {
4538                 kfree(args->ops);
4539                 args->ops = args->iops;
4540         }
4541         kfree(args->tmpp);
4542         args->tmpp = NULL;
4543         while (args->to_free) {
4544                 struct svcxdr_tmpbuf *tb = args->to_free;
4545                 args->to_free = tb->next;
4546                 kfree(tb);
4547         }
4548         return 1;
4549 }
4550
4551 int
4552 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4553 {
4554         if (rqstp->rq_arg.head[0].iov_len % 4) {
4555                 /* client is nuts */
4556                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4557                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4558                 return 0;
4559         }
4560         args->p = p;
4561         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4562         args->pagelist = rqstp->rq_arg.pages;
4563         args->pagelen = rqstp->rq_arg.page_len;
4564         args->tmpp = NULL;
4565         args->to_free = NULL;
4566         args->ops = args->iops;
4567         args->rqstp = rqstp;
4568
4569         return !nfsd4_decode_compound(args);
4570 }
4571
4572 int
4573 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4574 {
4575         /*
4576          * All that remains is to write the tag and operation count...
4577          */
4578         struct xdr_buf *buf = resp->xdr.buf;
4579
4580         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4581                                  buf->tail[0].iov_len);
4582
4583         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4584
4585         p = resp->tagp;
4586         *p++ = htonl(resp->taglen);
4587         memcpy(p, resp->tag, resp->taglen);
4588         p += XDR_QUADLEN(resp->taglen);
4589         *p++ = htonl(resp->opcnt);
4590
4591         nfsd4_sequence_done(resp);
4592         return 1;
4593 }
4594
4595 /*
4596  * Local variables:
4597  *  c-basic-offset: 8
4598  * End:
4599  */