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 const 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 > NFS_FILE_SYNC)
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                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2421                         err = security_inode_getsecctx(d_inode(dentry),
2422                                                 &context, &contextlen);
2423                 else
2424                         err = -EOPNOTSUPP;
2425                 contextsupport = (err == 0);
2426                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2427                         if (err == -EOPNOTSUPP)
2428                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2429                         else if (err)
2430                                 goto out_nfserr;
2431                 }
2432         }
2433 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2434
2435         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2436         if (status)
2437                 goto out;
2438
2439         attrlen_offset = xdr->buf->len;
2440         p = xdr_reserve_space(xdr, 4);
2441         if (!p)
2442                 goto out_resource;
2443         p++;                /* to be backfilled later */
2444
2445         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2446                 u32 supp[3];
2447
2448                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2449
2450                 if (!IS_POSIXACL(dentry->d_inode))
2451                         supp[0] &= ~FATTR4_WORD0_ACL;
2452                 if (!contextsupport)
2453                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2454                 if (!supp[2]) {
2455                         p = xdr_reserve_space(xdr, 12);
2456                         if (!p)
2457                                 goto out_resource;
2458                         *p++ = cpu_to_be32(2);
2459                         *p++ = cpu_to_be32(supp[0]);
2460                         *p++ = cpu_to_be32(supp[1]);
2461                 } else {
2462                         p = xdr_reserve_space(xdr, 16);
2463                         if (!p)
2464                                 goto out_resource;
2465                         *p++ = cpu_to_be32(3);
2466                         *p++ = cpu_to_be32(supp[0]);
2467                         *p++ = cpu_to_be32(supp[1]);
2468                         *p++ = cpu_to_be32(supp[2]);
2469                 }
2470         }
2471         if (bmval0 & FATTR4_WORD0_TYPE) {
2472                 p = xdr_reserve_space(xdr, 4);
2473                 if (!p)
2474                         goto out_resource;
2475                 dummy = nfs4_file_type(stat.mode);
2476                 if (dummy == NF4BAD) {
2477                         status = nfserr_serverfault;
2478                         goto out;
2479                 }
2480                 *p++ = cpu_to_be32(dummy);
2481         }
2482         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2483                 p = xdr_reserve_space(xdr, 4);
2484                 if (!p)
2485                         goto out_resource;
2486                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2487                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2488                 else
2489                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2490                                                 NFS4_FH_VOL_RENAME);
2491         }
2492         if (bmval0 & FATTR4_WORD0_CHANGE) {
2493                 p = xdr_reserve_space(xdr, 8);
2494                 if (!p)
2495                         goto out_resource;
2496                 p = encode_change(p, &stat, d_inode(dentry));
2497         }
2498         if (bmval0 & FATTR4_WORD0_SIZE) {
2499                 p = xdr_reserve_space(xdr, 8);
2500                 if (!p)
2501                         goto out_resource;
2502                 p = xdr_encode_hyper(p, stat.size);
2503         }
2504         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2505                 p = xdr_reserve_space(xdr, 4);
2506                 if (!p)
2507                         goto out_resource;
2508                 *p++ = cpu_to_be32(1);
2509         }
2510         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2511                 p = xdr_reserve_space(xdr, 4);
2512                 if (!p)
2513                         goto out_resource;
2514                 *p++ = cpu_to_be32(1);
2515         }
2516         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2517                 p = xdr_reserve_space(xdr, 4);
2518                 if (!p)
2519                         goto out_resource;
2520                 *p++ = cpu_to_be32(0);
2521         }
2522         if (bmval0 & FATTR4_WORD0_FSID) {
2523                 p = xdr_reserve_space(xdr, 16);
2524                 if (!p)
2525                         goto out_resource;
2526                 if (exp->ex_fslocs.migrated) {
2527                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2528                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2529                 } else switch(fsid_source(fhp)) {
2530                 case FSIDSOURCE_FSID:
2531                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2532                         p = xdr_encode_hyper(p, (u64)0);
2533                         break;
2534                 case FSIDSOURCE_DEV:
2535                         *p++ = cpu_to_be32(0);
2536                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2537                         *p++ = cpu_to_be32(0);
2538                         *p++ = cpu_to_be32(MINOR(stat.dev));
2539                         break;
2540                 case FSIDSOURCE_UUID:
2541                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2542                                                                 EX_UUID_LEN);
2543                         break;
2544                 }
2545         }
2546         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2547                 p = xdr_reserve_space(xdr, 4);
2548                 if (!p)
2549                         goto out_resource;
2550                 *p++ = cpu_to_be32(0);
2551         }
2552         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2553                 p = xdr_reserve_space(xdr, 4);
2554                 if (!p)
2555                         goto out_resource;
2556                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2557         }
2558         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2559                 p = xdr_reserve_space(xdr, 4);
2560                 if (!p)
2561                         goto out_resource;
2562                 *p++ = cpu_to_be32(rdattr_err);
2563         }
2564         if (bmval0 & FATTR4_WORD0_ACL) {
2565                 struct nfs4_ace *ace;
2566
2567                 if (acl == NULL) {
2568                         p = xdr_reserve_space(xdr, 4);
2569                         if (!p)
2570                                 goto out_resource;
2571
2572                         *p++ = cpu_to_be32(0);
2573                         goto out_acl;
2574                 }
2575                 p = xdr_reserve_space(xdr, 4);
2576                 if (!p)
2577                         goto out_resource;
2578                 *p++ = cpu_to_be32(acl->naces);
2579
2580                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2581                         p = xdr_reserve_space(xdr, 4*3);
2582                         if (!p)
2583                                 goto out_resource;
2584                         *p++ = cpu_to_be32(ace->type);
2585                         *p++ = cpu_to_be32(ace->flag);
2586                         *p++ = cpu_to_be32(ace->access_mask &
2587                                                         NFS4_ACE_MASK_ALL);
2588                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2589                         if (status)
2590                                 goto out;
2591                 }
2592         }
2593 out_acl:
2594         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2595                 p = xdr_reserve_space(xdr, 4);
2596                 if (!p)
2597                         goto out_resource;
2598                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2599                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2600         }
2601         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2602                 p = xdr_reserve_space(xdr, 4);
2603                 if (!p)
2604                         goto out_resource;
2605                 *p++ = cpu_to_be32(1);
2606         }
2607         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2608                 p = xdr_reserve_space(xdr, 4);
2609                 if (!p)
2610                         goto out_resource;
2611                 *p++ = cpu_to_be32(0);
2612         }
2613         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2614                 p = xdr_reserve_space(xdr, 4);
2615                 if (!p)
2616                         goto out_resource;
2617                 *p++ = cpu_to_be32(1);
2618         }
2619         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2620                 p = xdr_reserve_space(xdr, 4);
2621                 if (!p)
2622                         goto out_resource;
2623                 *p++ = cpu_to_be32(1);
2624         }
2625         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2626                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2627                 if (!p)
2628                         goto out_resource;
2629                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2630                                         fhp->fh_handle.fh_size);
2631         }
2632         if (bmval0 & FATTR4_WORD0_FILEID) {
2633                 p = xdr_reserve_space(xdr, 8);
2634                 if (!p)
2635                         goto out_resource;
2636                 p = xdr_encode_hyper(p, stat.ino);
2637         }
2638         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2639                 p = xdr_reserve_space(xdr, 8);
2640                 if (!p)
2641                         goto out_resource;
2642                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2643         }
2644         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2645                 p = xdr_reserve_space(xdr, 8);
2646                 if (!p)
2647                         goto out_resource;
2648                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2649         }
2650         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2651                 p = xdr_reserve_space(xdr, 8);
2652                 if (!p)
2653                         goto out_resource;
2654                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2655         }
2656         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2657                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2658                 if (status)
2659                         goto out;
2660         }
2661         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2662                 p = xdr_reserve_space(xdr, 4);
2663                 if (!p)
2664                         goto out_resource;
2665                 *p++ = cpu_to_be32(1);
2666         }
2667         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2668                 p = xdr_reserve_space(xdr, 8);
2669                 if (!p)
2670                         goto out_resource;
2671                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2672         }
2673         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2674                 p = xdr_reserve_space(xdr, 4);
2675                 if (!p)
2676                         goto out_resource;
2677                 *p++ = cpu_to_be32(255);
2678         }
2679         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2680                 p = xdr_reserve_space(xdr, 4);
2681                 if (!p)
2682                         goto out_resource;
2683                 *p++ = cpu_to_be32(statfs.f_namelen);
2684         }
2685         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2686                 p = xdr_reserve_space(xdr, 8);
2687                 if (!p)
2688                         goto out_resource;
2689                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2690         }
2691         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2692                 p = xdr_reserve_space(xdr, 8);
2693                 if (!p)
2694                         goto out_resource;
2695                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2696         }
2697         if (bmval1 & FATTR4_WORD1_MODE) {
2698                 p = xdr_reserve_space(xdr, 4);
2699                 if (!p)
2700                         goto out_resource;
2701                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2702         }
2703         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2704                 p = xdr_reserve_space(xdr, 4);
2705                 if (!p)
2706                         goto out_resource;
2707                 *p++ = cpu_to_be32(1);
2708         }
2709         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2710                 p = xdr_reserve_space(xdr, 4);
2711                 if (!p)
2712                         goto out_resource;
2713                 *p++ = cpu_to_be32(stat.nlink);
2714         }
2715         if (bmval1 & FATTR4_WORD1_OWNER) {
2716                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2717                 if (status)
2718                         goto out;
2719         }
2720         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2721                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2722                 if (status)
2723                         goto out;
2724         }
2725         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2726                 p = xdr_reserve_space(xdr, 8);
2727                 if (!p)
2728                         goto out_resource;
2729                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2730                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2731         }
2732         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2733                 p = xdr_reserve_space(xdr, 8);
2734                 if (!p)
2735                         goto out_resource;
2736                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2737                 p = xdr_encode_hyper(p, dummy64);
2738         }
2739         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2740                 p = xdr_reserve_space(xdr, 8);
2741                 if (!p)
2742                         goto out_resource;
2743                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2744                 p = xdr_encode_hyper(p, dummy64);
2745         }
2746         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2747                 p = xdr_reserve_space(xdr, 8);
2748                 if (!p)
2749                         goto out_resource;
2750                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2751                 p = xdr_encode_hyper(p, dummy64);
2752         }
2753         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2754                 p = xdr_reserve_space(xdr, 8);
2755                 if (!p)
2756                         goto out_resource;
2757                 dummy64 = (u64)stat.blocks << 9;
2758                 p = xdr_encode_hyper(p, dummy64);
2759         }
2760         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2761                 p = xdr_reserve_space(xdr, 12);
2762                 if (!p)
2763                         goto out_resource;
2764                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2765                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2766         }
2767         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2768                 p = xdr_reserve_space(xdr, 12);
2769                 if (!p)
2770                         goto out_resource;
2771                 *p++ = cpu_to_be32(0);
2772                 *p++ = cpu_to_be32(1);
2773                 *p++ = cpu_to_be32(0);
2774         }
2775         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2776                 p = xdr_reserve_space(xdr, 12);
2777                 if (!p)
2778                         goto out_resource;
2779                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2780                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2781         }
2782         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2783                 p = xdr_reserve_space(xdr, 12);
2784                 if (!p)
2785                         goto out_resource;
2786                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2787                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2788         }
2789         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2790                 struct kstat parent_stat;
2791                 u64 ino = stat.ino;
2792
2793                 p = xdr_reserve_space(xdr, 8);
2794                 if (!p)
2795                         goto out_resource;
2796                 /*
2797                  * Get parent's attributes if not ignoring crossmount
2798                  * and this is the root of a cross-mounted filesystem.
2799                  */
2800                 if (ignore_crossmnt == 0 &&
2801                     dentry == exp->ex_path.mnt->mnt_root) {
2802                         err = get_parent_attributes(exp, &parent_stat);
2803                         if (err)
2804                                 goto out_nfserr;
2805                         ino = parent_stat.ino;
2806                 }
2807                 p = xdr_encode_hyper(p, ino);
2808         }
2809 #ifdef CONFIG_NFSD_PNFS
2810         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2811                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2812                 if (status)
2813                         goto out;
2814         }
2815
2816         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2817                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2818                 if (status)
2819                         goto out;
2820         }
2821
2822         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2823                 p = xdr_reserve_space(xdr, 4);
2824                 if (!p)
2825                         goto out_resource;
2826                 *p++ = cpu_to_be32(stat.blksize);
2827         }
2828 #endif /* CONFIG_NFSD_PNFS */
2829         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2830                 status = nfsd4_encode_bitmap(xdr, NFSD_SUPPATTR_EXCLCREAT_WORD0,
2831                                                   NFSD_SUPPATTR_EXCLCREAT_WORD1,
2832                                                   NFSD_SUPPATTR_EXCLCREAT_WORD2);
2833                 if (status)
2834                         goto out;
2835         }
2836
2837         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2838                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2839                                                                 contextlen);
2840                 if (status)
2841                         goto out;
2842         }
2843
2844         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2845         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2846         status = nfs_ok;
2847
2848 out:
2849 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2850         if (context)
2851                 security_release_secctx(context, contextlen);
2852 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2853         kfree(acl);
2854         if (tempfh) {
2855                 fh_put(tempfh);
2856                 kfree(tempfh);
2857         }
2858         if (status)
2859                 xdr_truncate_encode(xdr, starting_len);
2860         return status;
2861 out_nfserr:
2862         status = nfserrno(err);
2863         goto out;
2864 out_resource:
2865         status = nfserr_resource;
2866         goto out;
2867 }
2868
2869 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2870                                 struct xdr_buf *buf, __be32 *p, int bytes)
2871 {
2872         xdr->scratch.iov_len = 0;
2873         memset(buf, 0, sizeof(struct xdr_buf));
2874         buf->head[0].iov_base = p;
2875         buf->head[0].iov_len = 0;
2876         buf->len = 0;
2877         xdr->buf = buf;
2878         xdr->iov = buf->head;
2879         xdr->p = p;
2880         xdr->end = (void *)p + bytes;
2881         buf->buflen = bytes;
2882 }
2883
2884 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2885                         struct svc_fh *fhp, struct svc_export *exp,
2886                         struct dentry *dentry, u32 *bmval,
2887                         struct svc_rqst *rqstp, int ignore_crossmnt)
2888 {
2889         struct xdr_buf dummy;
2890         struct xdr_stream xdr;
2891         __be32 ret;
2892
2893         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2894         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2895                                                         ignore_crossmnt);
2896         *p = xdr.p;
2897         return ret;
2898 }
2899
2900 static inline int attributes_need_mount(u32 *bmval)
2901 {
2902         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2903                 return 1;
2904         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2905                 return 1;
2906         return 0;
2907 }
2908
2909 static __be32
2910 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2911                         const char *name, int namlen)
2912 {
2913         struct svc_export *exp = cd->rd_fhp->fh_export;
2914         struct dentry *dentry;
2915         __be32 nfserr;
2916         int ignore_crossmnt = 0;
2917
2918         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2919         if (IS_ERR(dentry))
2920                 return nfserrno(PTR_ERR(dentry));
2921         if (d_really_is_negative(dentry)) {
2922                 /*
2923                  * we're not holding the i_mutex here, so there's
2924                  * a window where this directory entry could have gone
2925                  * away.
2926                  */
2927                 dput(dentry);
2928                 return nfserr_noent;
2929         }
2930
2931         exp_get(exp);
2932         /*
2933          * In the case of a mountpoint, the client may be asking for
2934          * attributes that are only properties of the underlying filesystem
2935          * as opposed to the cross-mounted file system. In such a case,
2936          * we will not follow the cross mount and will fill the attribtutes
2937          * directly from the mountpoint dentry.
2938          */
2939         if (nfsd_mountpoint(dentry, exp)) {
2940                 int err;
2941
2942                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2943                                 && !attributes_need_mount(cd->rd_bmval)) {
2944                         ignore_crossmnt = 1;
2945                         goto out_encode;
2946                 }
2947                 /*
2948                  * Why the heck aren't we just using nfsd_lookup??
2949                  * Different "."/".." handling?  Something else?
2950                  * At least, add a comment here to explain....
2951                  */
2952                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2953                 if (err) {
2954                         nfserr = nfserrno(err);
2955                         goto out_put;
2956                 }
2957                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2958                 if (nfserr)
2959                         goto out_put;
2960
2961         }
2962 out_encode:
2963         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2964                                         cd->rd_rqstp, ignore_crossmnt);
2965 out_put:
2966         dput(dentry);
2967         exp_put(exp);
2968         return nfserr;
2969 }
2970
2971 static __be32 *
2972 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2973 {
2974         __be32 *p;
2975
2976         p = xdr_reserve_space(xdr, 20);
2977         if (!p)
2978                 return NULL;
2979         *p++ = htonl(2);
2980         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2981         *p++ = htonl(0);                         /* bmval1 */
2982
2983         *p++ = htonl(4);     /* attribute length */
2984         *p++ = nfserr;       /* no htonl */
2985         return p;
2986 }
2987
2988 static int
2989 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2990                     loff_t offset, u64 ino, unsigned int d_type)
2991 {
2992         struct readdir_cd *ccd = ccdv;
2993         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2994         struct xdr_stream *xdr = cd->xdr;
2995         int start_offset = xdr->buf->len;
2996         int cookie_offset;
2997         u32 name_and_cookie;
2998         int entry_bytes;
2999         __be32 nfserr = nfserr_toosmall;
3000         __be64 wire_offset;
3001         __be32 *p;
3002
3003         /* In nfsv4, "." and ".." never make it onto the wire.. */
3004         if (name && isdotent(name, namlen)) {
3005                 cd->common.err = nfs_ok;
3006                 return 0;
3007         }
3008
3009         if (cd->cookie_offset) {
3010                 wire_offset = cpu_to_be64(offset);
3011                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3012                                                         &wire_offset, 8);
3013         }
3014
3015         p = xdr_reserve_space(xdr, 4);
3016         if (!p)
3017                 goto fail;
3018         *p++ = xdr_one;                             /* mark entry present */
3019         cookie_offset = xdr->buf->len;
3020         p = xdr_reserve_space(xdr, 3*4 + namlen);
3021         if (!p)
3022                 goto fail;
3023         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3024         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3025
3026         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3027         switch (nfserr) {
3028         case nfs_ok:
3029                 break;
3030         case nfserr_resource:
3031                 nfserr = nfserr_toosmall;
3032                 goto fail;
3033         case nfserr_noent:
3034                 xdr_truncate_encode(xdr, start_offset);
3035                 goto skip_entry;
3036         default:
3037                 /*
3038                  * If the client requested the RDATTR_ERROR attribute,
3039                  * we stuff the error code into this attribute
3040                  * and continue.  If this attribute was not requested,
3041                  * then in accordance with the spec, we fail the
3042                  * entire READDIR operation(!)
3043                  */
3044                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3045                         goto fail;
3046                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3047                 if (p == NULL) {
3048                         nfserr = nfserr_toosmall;
3049                         goto fail;
3050                 }
3051         }
3052         nfserr = nfserr_toosmall;
3053         entry_bytes = xdr->buf->len - start_offset;
3054         if (entry_bytes > cd->rd_maxcount)
3055                 goto fail;
3056         cd->rd_maxcount -= entry_bytes;
3057         /*
3058          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3059          * let's always let through the first entry, at least:
3060          */
3061         if (!cd->rd_dircount)
3062                 goto fail;
3063         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3064         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3065                 goto fail;
3066         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3067
3068         cd->cookie_offset = cookie_offset;
3069 skip_entry:
3070         cd->common.err = nfs_ok;
3071         return 0;
3072 fail:
3073         xdr_truncate_encode(xdr, start_offset);
3074         cd->common.err = nfserr;
3075         return -EINVAL;
3076 }
3077
3078 static __be32
3079 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3080 {
3081         __be32 *p;
3082
3083         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3084         if (!p)
3085                 return nfserr_resource;
3086         *p++ = cpu_to_be32(sid->si_generation);
3087         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3088                                         sizeof(stateid_opaque_t));
3089         return 0;
3090 }
3091
3092 static __be32
3093 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3094 {
3095         struct xdr_stream *xdr = &resp->xdr;
3096         __be32 *p;
3097
3098         if (!nfserr) {
3099                 p = xdr_reserve_space(xdr, 8);
3100                 if (!p)
3101                         return nfserr_resource;
3102                 *p++ = cpu_to_be32(access->ac_supported);
3103                 *p++ = cpu_to_be32(access->ac_resp_access);
3104         }
3105         return nfserr;
3106 }
3107
3108 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3109 {
3110         struct xdr_stream *xdr = &resp->xdr;
3111         __be32 *p;
3112
3113         if (!nfserr) {
3114                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3115                 if (!p)
3116                         return nfserr_resource;
3117                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3118                                                 NFS4_MAX_SESSIONID_LEN);
3119                 *p++ = cpu_to_be32(bcts->dir);
3120                 /* Upshifting from TCP to RDMA is not supported */
3121                 *p++ = cpu_to_be32(0);
3122         }
3123         return nfserr;
3124 }
3125
3126 static __be32
3127 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3128 {
3129         struct xdr_stream *xdr = &resp->xdr;
3130
3131         if (!nfserr)
3132                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3133
3134         return nfserr;
3135 }
3136
3137
3138 static __be32
3139 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3140 {
3141         struct xdr_stream *xdr = &resp->xdr;
3142         __be32 *p;
3143
3144         if (!nfserr) {
3145                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3146                 if (!p)
3147                         return nfserr_resource;
3148                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3149                                                 NFS4_VERIFIER_SIZE);
3150         }
3151         return nfserr;
3152 }
3153
3154 static __be32
3155 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3156 {
3157         struct xdr_stream *xdr = &resp->xdr;
3158         __be32 *p;
3159
3160         if (!nfserr) {
3161                 p = xdr_reserve_space(xdr, 20);
3162                 if (!p)
3163                         return nfserr_resource;
3164                 encode_cinfo(p, &create->cr_cinfo);
3165                 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3166                                 create->cr_bmval[1], create->cr_bmval[2]);
3167         }
3168         return nfserr;
3169 }
3170
3171 static __be32
3172 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3173 {
3174         struct svc_fh *fhp = getattr->ga_fhp;
3175         struct xdr_stream *xdr = &resp->xdr;
3176
3177         if (nfserr)
3178                 return nfserr;
3179
3180         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3181                                     getattr->ga_bmval,
3182                                     resp->rqstp, 0);
3183         return nfserr;
3184 }
3185
3186 static __be32
3187 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3188 {
3189         struct xdr_stream *xdr = &resp->xdr;
3190         struct svc_fh *fhp = *fhpp;
3191         unsigned int len;
3192         __be32 *p;
3193
3194         if (!nfserr) {
3195                 len = fhp->fh_handle.fh_size;
3196                 p = xdr_reserve_space(xdr, len + 4);
3197                 if (!p)
3198                         return nfserr_resource;
3199                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3200         }
3201         return nfserr;
3202 }
3203
3204 /*
3205 * Including all fields other than the name, a LOCK4denied structure requires
3206 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3207 */
3208 static __be32
3209 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3210 {
3211         struct xdr_netobj *conf = &ld->ld_owner;
3212         __be32 *p;
3213
3214 again:
3215         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3216         if (!p) {
3217                 /*
3218                  * Don't fail to return the result just because we can't
3219                  * return the conflicting open:
3220                  */
3221                 if (conf->len) {
3222                         kfree(conf->data);
3223                         conf->len = 0;
3224                         conf->data = NULL;
3225                         goto again;
3226                 }
3227                 return nfserr_resource;
3228         }
3229         p = xdr_encode_hyper(p, ld->ld_start);
3230         p = xdr_encode_hyper(p, ld->ld_length);
3231         *p++ = cpu_to_be32(ld->ld_type);
3232         if (conf->len) {
3233                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3234                 p = xdr_encode_opaque(p, conf->data, conf->len);
3235                 kfree(conf->data);
3236         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3237                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3238                 *p++ = cpu_to_be32(0); /* length of owner name */
3239         }
3240         return nfserr_denied;
3241 }
3242
3243 static __be32
3244 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3245 {
3246         struct xdr_stream *xdr = &resp->xdr;
3247
3248         if (!nfserr)
3249                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3250         else if (nfserr == nfserr_denied)
3251                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3252
3253         return nfserr;
3254 }
3255
3256 static __be32
3257 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3258 {
3259         struct xdr_stream *xdr = &resp->xdr;
3260
3261         if (nfserr == nfserr_denied)
3262                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3263         return nfserr;
3264 }
3265
3266 static __be32
3267 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3268 {
3269         struct xdr_stream *xdr = &resp->xdr;
3270
3271         if (!nfserr)
3272                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3273
3274         return nfserr;
3275 }
3276
3277
3278 static __be32
3279 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3280 {
3281         struct xdr_stream *xdr = &resp->xdr;
3282         __be32 *p;
3283
3284         if (!nfserr) {
3285                 p = xdr_reserve_space(xdr, 20);
3286                 if (!p)
3287                         return nfserr_resource;
3288                 p = encode_cinfo(p, &link->li_cinfo);
3289         }
3290         return nfserr;
3291 }
3292
3293
3294 static __be32
3295 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3296 {
3297         struct xdr_stream *xdr = &resp->xdr;
3298         __be32 *p;
3299
3300         if (nfserr)
3301                 goto out;
3302
3303         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3304         if (nfserr)
3305                 goto out;
3306         p = xdr_reserve_space(xdr, 24);
3307         if (!p)
3308                 return nfserr_resource;
3309         p = encode_cinfo(p, &open->op_cinfo);
3310         *p++ = cpu_to_be32(open->op_rflags);
3311
3312         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3313                                         open->op_bmval[2]);
3314         if (nfserr)
3315                 goto out;
3316
3317         p = xdr_reserve_space(xdr, 4);
3318         if (!p)
3319                 return nfserr_resource;
3320
3321         *p++ = cpu_to_be32(open->op_delegate_type);
3322         switch (open->op_delegate_type) {
3323         case NFS4_OPEN_DELEGATE_NONE:
3324                 break;
3325         case NFS4_OPEN_DELEGATE_READ:
3326                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3327                 if (nfserr)
3328                         return nfserr;
3329                 p = xdr_reserve_space(xdr, 20);
3330                 if (!p)
3331                         return nfserr_resource;
3332                 *p++ = cpu_to_be32(open->op_recall);
3333
3334                 /*
3335                  * TODO: ACE's in delegations
3336                  */
3337                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3338                 *p++ = cpu_to_be32(0);
3339                 *p++ = cpu_to_be32(0);
3340                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3341                 break;
3342         case NFS4_OPEN_DELEGATE_WRITE:
3343                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3344                 if (nfserr)
3345                         return nfserr;
3346                 p = xdr_reserve_space(xdr, 32);
3347                 if (!p)
3348                         return nfserr_resource;
3349                 *p++ = cpu_to_be32(0);
3350
3351                 /*
3352                  * TODO: space_limit's in delegations
3353                  */
3354                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3355                 *p++ = cpu_to_be32(~(u32)0);
3356                 *p++ = cpu_to_be32(~(u32)0);
3357
3358                 /*
3359                  * TODO: ACE's in delegations
3360                  */
3361                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3362                 *p++ = cpu_to_be32(0);
3363                 *p++ = cpu_to_be32(0);
3364                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3365                 break;
3366         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3367                 switch (open->op_why_no_deleg) {
3368                 case WND4_CONTENTION:
3369                 case WND4_RESOURCE:
3370                         p = xdr_reserve_space(xdr, 8);
3371                         if (!p)
3372                                 return nfserr_resource;
3373                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3374                         /* deleg signaling not supported yet: */
3375                         *p++ = cpu_to_be32(0);
3376                         break;
3377                 default:
3378                         p = xdr_reserve_space(xdr, 4);
3379                         if (!p)
3380                                 return nfserr_resource;
3381                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3382                 }
3383                 break;
3384         default:
3385                 BUG();
3386         }
3387         /* XXX save filehandle here */
3388 out:
3389         return nfserr;
3390 }
3391
3392 static __be32
3393 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3394 {
3395         struct xdr_stream *xdr = &resp->xdr;
3396
3397         if (!nfserr)
3398                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3399
3400         return nfserr;
3401 }
3402
3403 static __be32
3404 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3405 {
3406         struct xdr_stream *xdr = &resp->xdr;
3407
3408         if (!nfserr)
3409                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3410
3411         return nfserr;
3412 }
3413
3414 static __be32 nfsd4_encode_splice_read(
3415                                 struct nfsd4_compoundres *resp,
3416                                 struct nfsd4_read *read,
3417                                 struct file *file, unsigned long maxcount)
3418 {
3419         struct xdr_stream *xdr = &resp->xdr;
3420         struct xdr_buf *buf = xdr->buf;
3421         u32 eof;
3422         long len;
3423         int space_left;
3424         __be32 nfserr;
3425         __be32 *p = xdr->p - 2;
3426
3427         /* Make sure there will be room for padding if needed */
3428         if (xdr->end - xdr->p < 1)
3429                 return nfserr_resource;
3430
3431         len = maxcount;
3432         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3433                                   read->rd_offset, &maxcount);
3434         if (nfserr) {
3435                 /*
3436                  * nfsd_splice_actor may have already messed with the
3437                  * page length; reset it so as not to confuse
3438                  * xdr_truncate_encode:
3439                  */
3440                 buf->page_len = 0;
3441                 return nfserr;
3442         }
3443
3444         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3445                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3446
3447         *(p++) = htonl(eof);
3448         *(p++) = htonl(maxcount);
3449
3450         buf->page_len = maxcount;
3451         buf->len += maxcount;
3452         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3453                                                         / PAGE_SIZE;
3454
3455         /* Use rest of head for padding and remaining ops: */
3456         buf->tail[0].iov_base = xdr->p;
3457         buf->tail[0].iov_len = 0;
3458         xdr->iov = buf->tail;
3459         if (maxcount&3) {
3460                 int pad = 4 - (maxcount&3);
3461
3462                 *(xdr->p++) = 0;
3463
3464                 buf->tail[0].iov_base += maxcount&3;
3465                 buf->tail[0].iov_len = pad;
3466                 buf->len += pad;
3467         }
3468
3469         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3470                                 buf->buflen - buf->len);
3471         buf->buflen = buf->len + space_left;
3472         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3473
3474         return 0;
3475 }
3476
3477 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3478                                  struct nfsd4_read *read,
3479                                  struct file *file, unsigned long maxcount)
3480 {
3481         struct xdr_stream *xdr = &resp->xdr;
3482         u32 eof;
3483         int v;
3484         int starting_len = xdr->buf->len - 8;
3485         long len;
3486         int thislen;
3487         __be32 nfserr;
3488         __be32 tmp;
3489         __be32 *p;
3490         u32 zzz = 0;
3491         int pad;
3492
3493         len = maxcount;
3494         v = 0;
3495
3496         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3497         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3498         WARN_ON_ONCE(!p);
3499         resp->rqstp->rq_vec[v].iov_base = p;
3500         resp->rqstp->rq_vec[v].iov_len = thislen;
3501         v++;
3502         len -= thislen;
3503
3504         while (len) {
3505                 thislen = min_t(long, len, PAGE_SIZE);
3506                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3507                 WARN_ON_ONCE(!p);
3508                 resp->rqstp->rq_vec[v].iov_base = p;
3509                 resp->rqstp->rq_vec[v].iov_len = thislen;
3510                 v++;
3511                 len -= thislen;
3512         }
3513         read->rd_vlen = v;
3514
3515         len = maxcount;
3516         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3517                         read->rd_vlen, &maxcount);
3518         if (nfserr)
3519                 return nfserr;
3520         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3521
3522         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3523                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3524
3525         tmp = htonl(eof);
3526         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3527         tmp = htonl(maxcount);
3528         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3529
3530         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3531         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3532                                                                 &zzz, pad);
3533         return 0;
3534
3535 }
3536
3537 static __be32
3538 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3539                   struct nfsd4_read *read)
3540 {
3541         unsigned long maxcount;
3542         struct xdr_stream *xdr = &resp->xdr;
3543         struct file *file = read->rd_filp;
3544         int starting_len = xdr->buf->len;
3545         struct raparms *ra = NULL;
3546         __be32 *p;
3547
3548         if (nfserr)
3549                 goto out;
3550
3551         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3552         if (!p) {
3553                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3554                 nfserr = nfserr_resource;
3555                 goto out;
3556         }
3557         if (resp->xdr.buf->page_len &&
3558             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3559                 WARN_ON_ONCE(1);
3560                 nfserr = nfserr_resource;
3561                 goto out;
3562         }
3563         xdr_commit_encode(xdr);
3564
3565         maxcount = svc_max_payload(resp->rqstp);
3566         maxcount = min_t(unsigned long, maxcount,
3567                          (xdr->buf->buflen - xdr->buf->len));
3568         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3569
3570         if (read->rd_tmp_file)
3571                 ra = nfsd_init_raparms(file);
3572
3573         if (file->f_op->splice_read &&
3574             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3575                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3576         else
3577                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3578
3579         if (ra)
3580                 nfsd_put_raparams(file, ra);
3581
3582         if (nfserr)
3583                 xdr_truncate_encode(xdr, starting_len);
3584
3585 out:
3586         if (file)
3587                 fput(file);
3588         return nfserr;
3589 }
3590
3591 static __be32
3592 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3593 {
3594         int maxcount;
3595         __be32 wire_count;
3596         int zero = 0;
3597         struct xdr_stream *xdr = &resp->xdr;
3598         int length_offset = xdr->buf->len;
3599         __be32 *p;
3600
3601         if (nfserr)
3602                 return nfserr;
3603
3604         p = xdr_reserve_space(xdr, 4);
3605         if (!p)
3606                 return nfserr_resource;
3607         maxcount = PAGE_SIZE;
3608
3609         p = xdr_reserve_space(xdr, maxcount);
3610         if (!p)
3611                 return nfserr_resource;
3612         /*
3613          * XXX: By default, vfs_readlink() will truncate symlinks if they
3614          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
3615          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3616          * that truncation occurred, and return NFS4ERR_RESOURCE.
3617          */
3618         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3619                                                 (char *)p, &maxcount);
3620         if (nfserr == nfserr_isdir)
3621                 nfserr = nfserr_inval;
3622         if (nfserr) {
3623                 xdr_truncate_encode(xdr, length_offset);
3624                 return nfserr;
3625         }
3626
3627         wire_count = htonl(maxcount);
3628         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3629         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3630         if (maxcount & 3)
3631                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3632                                                 &zero, 4 - (maxcount&3));
3633         return 0;
3634 }
3635
3636 static __be32
3637 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3638 {
3639         int maxcount;
3640         int bytes_left;
3641         loff_t offset;
3642         __be64 wire_offset;
3643         struct xdr_stream *xdr = &resp->xdr;
3644         int starting_len = xdr->buf->len;
3645         __be32 *p;
3646
3647         if (nfserr)
3648                 return nfserr;
3649
3650         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3651         if (!p)
3652                 return nfserr_resource;
3653
3654         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3655         *p++ = cpu_to_be32(0);
3656         *p++ = cpu_to_be32(0);
3657         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3658                                 - (char *)resp->xdr.buf->head[0].iov_base;
3659
3660         /*
3661          * Number of bytes left for directory entries allowing for the
3662          * final 8 bytes of the readdir and a following failed op:
3663          */
3664         bytes_left = xdr->buf->buflen - xdr->buf->len
3665                         - COMPOUND_ERR_SLACK_SPACE - 8;
3666         if (bytes_left < 0) {
3667                 nfserr = nfserr_resource;
3668                 goto err_no_verf;
3669         }
3670         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3671         /*
3672          * Note the rfc defines rd_maxcount as the size of the
3673          * READDIR4resok structure, which includes the verifier above
3674          * and the 8 bytes encoded at the end of this function:
3675          */
3676         if (maxcount < 16) {
3677                 nfserr = nfserr_toosmall;
3678                 goto err_no_verf;
3679         }
3680         maxcount = min_t(int, maxcount-16, bytes_left);
3681
3682         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3683         if (!readdir->rd_dircount)
3684                 readdir->rd_dircount = INT_MAX;
3685
3686         readdir->xdr = xdr;
3687         readdir->rd_maxcount = maxcount;
3688         readdir->common.err = 0;
3689         readdir->cookie_offset = 0;
3690
3691         offset = readdir->rd_cookie;
3692         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3693                               &offset,
3694                               &readdir->common, nfsd4_encode_dirent);
3695         if (nfserr == nfs_ok &&
3696             readdir->common.err == nfserr_toosmall &&
3697             xdr->buf->len == starting_len + 8) {
3698                 /* nothing encoded; which limit did we hit?: */
3699                 if (maxcount - 16 < bytes_left)
3700                         /* It was the fault of rd_maxcount: */
3701                         nfserr = nfserr_toosmall;
3702                 else
3703                         /* We ran out of buffer space: */
3704                         nfserr = nfserr_resource;
3705         }
3706         if (nfserr)
3707                 goto err_no_verf;
3708
3709         if (readdir->cookie_offset) {
3710                 wire_offset = cpu_to_be64(offset);
3711                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3712                                                         &wire_offset, 8);
3713         }
3714
3715         p = xdr_reserve_space(xdr, 8);
3716         if (!p) {
3717                 WARN_ON_ONCE(1);
3718                 goto err_no_verf;
3719         }
3720         *p++ = 0;       /* no more entries */
3721         *p++ = htonl(readdir->common.err == nfserr_eof);
3722
3723         return 0;
3724 err_no_verf:
3725         xdr_truncate_encode(xdr, starting_len);
3726         return nfserr;
3727 }
3728
3729 static __be32
3730 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3731 {
3732         struct xdr_stream *xdr = &resp->xdr;
3733         __be32 *p;
3734
3735         if (!nfserr) {
3736                 p = xdr_reserve_space(xdr, 20);
3737                 if (!p)
3738                         return nfserr_resource;
3739                 p = encode_cinfo(p, &remove->rm_cinfo);
3740         }
3741         return nfserr;
3742 }
3743
3744 static __be32
3745 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3746 {
3747         struct xdr_stream *xdr = &resp->xdr;
3748         __be32 *p;
3749
3750         if (!nfserr) {
3751                 p = xdr_reserve_space(xdr, 40);
3752                 if (!p)
3753                         return nfserr_resource;
3754                 p = encode_cinfo(p, &rename->rn_sinfo);
3755                 p = encode_cinfo(p, &rename->rn_tinfo);
3756         }
3757         return nfserr;
3758 }
3759
3760 static __be32
3761 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3762                          __be32 nfserr, struct svc_export *exp)
3763 {
3764         u32 i, nflavs, supported;
3765         struct exp_flavor_info *flavs;
3766         struct exp_flavor_info def_flavs[2];
3767         __be32 *p, *flavorsp;
3768         static bool report = true;
3769
3770         if (nfserr)
3771                 goto out;
3772         nfserr = nfserr_resource;
3773         if (exp->ex_nflavors) {
3774                 flavs = exp->ex_flavors;
3775                 nflavs = exp->ex_nflavors;
3776         } else { /* Handling of some defaults in absence of real secinfo: */
3777                 flavs = def_flavs;
3778                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3779                         nflavs = 2;
3780                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3781                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3782                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3783                         nflavs = 1;
3784                         flavs[0].pseudoflavor
3785                                         = svcauth_gss_flavor(exp->ex_client);
3786                 } else {
3787                         nflavs = 1;
3788                         flavs[0].pseudoflavor
3789                                         = exp->ex_client->flavour->flavour;
3790                 }
3791         }
3792
3793         supported = 0;
3794         p = xdr_reserve_space(xdr, 4);
3795         if (!p)
3796                 goto out;
3797         flavorsp = p++;         /* to be backfilled later */
3798
3799         for (i = 0; i < nflavs; i++) {
3800                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3801                 struct rpcsec_gss_info info;
3802
3803                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3804                         supported++;
3805                         p = xdr_reserve_space(xdr, 4 + 4 +
3806                                               XDR_LEN(info.oid.len) + 4 + 4);
3807                         if (!p)
3808                                 goto out;
3809                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3810                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3811                         *p++ = cpu_to_be32(info.qop);
3812                         *p++ = cpu_to_be32(info.service);
3813                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3814                         supported++;
3815                         p = xdr_reserve_space(xdr, 4);
3816                         if (!p)
3817                                 goto out;
3818                         *p++ = cpu_to_be32(pf);
3819                 } else {
3820                         if (report)
3821                                 pr_warn("NFS: SECINFO: security flavor %u "
3822                                         "is not supported\n", pf);
3823                 }
3824         }
3825
3826         if (nflavs != supported)
3827                 report = false;
3828         *flavorsp = htonl(supported);
3829         nfserr = 0;
3830 out:
3831         if (exp)
3832                 exp_put(exp);
3833         return nfserr;
3834 }
3835
3836 static __be32
3837 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3838                      struct nfsd4_secinfo *secinfo)
3839 {
3840         struct xdr_stream *xdr = &resp->xdr;
3841
3842         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3843 }
3844
3845 static __be32
3846 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3847                      struct nfsd4_secinfo_no_name *secinfo)
3848 {
3849         struct xdr_stream *xdr = &resp->xdr;
3850
3851         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3852 }
3853
3854 /*
3855  * The SETATTR encode routine is special -- it always encodes a bitmap,
3856  * regardless of the error status.
3857  */
3858 static __be32
3859 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3860 {
3861         struct xdr_stream *xdr = &resp->xdr;
3862         __be32 *p;
3863
3864         p = xdr_reserve_space(xdr, 16);
3865         if (!p)
3866                 return nfserr_resource;
3867         if (nfserr) {
3868                 *p++ = cpu_to_be32(3);
3869                 *p++ = cpu_to_be32(0);
3870                 *p++ = cpu_to_be32(0);
3871                 *p++ = cpu_to_be32(0);
3872         }
3873         else {
3874                 *p++ = cpu_to_be32(3);
3875                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3876                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3877                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3878         }
3879         return nfserr;
3880 }
3881
3882 static __be32
3883 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3884 {
3885         struct xdr_stream *xdr = &resp->xdr;
3886         __be32 *p;
3887
3888         if (!nfserr) {
3889                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3890                 if (!p)
3891                         return nfserr_resource;
3892                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3893                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3894                                                 NFS4_VERIFIER_SIZE);
3895         }
3896         else if (nfserr == nfserr_clid_inuse) {
3897                 p = xdr_reserve_space(xdr, 8);
3898                 if (!p)
3899                         return nfserr_resource;
3900                 *p++ = cpu_to_be32(0);
3901                 *p++ = cpu_to_be32(0);
3902         }
3903         return nfserr;
3904 }
3905
3906 static __be32
3907 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3908 {
3909         struct xdr_stream *xdr = &resp->xdr;
3910         __be32 *p;
3911
3912         if (!nfserr) {
3913                 p = xdr_reserve_space(xdr, 16);
3914                 if (!p)
3915                         return nfserr_resource;
3916                 *p++ = cpu_to_be32(write->wr_bytes_written);
3917                 *p++ = cpu_to_be32(write->wr_how_written);
3918                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3919                                                         NFS4_VERIFIER_SIZE);
3920         }
3921         return nfserr;
3922 }
3923
3924 static __be32
3925 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3926                          struct nfsd4_exchange_id *exid)
3927 {
3928         struct xdr_stream *xdr = &resp->xdr;
3929         __be32 *p;
3930         char *major_id;
3931         char *server_scope;
3932         int major_id_sz;
3933         int server_scope_sz;
3934         int status = 0;
3935         uint64_t minor_id = 0;
3936
3937         if (nfserr)
3938                 return nfserr;
3939
3940         major_id = utsname()->nodename;
3941         major_id_sz = strlen(major_id);
3942         server_scope = utsname()->nodename;
3943         server_scope_sz = strlen(server_scope);
3944
3945         p = xdr_reserve_space(xdr,
3946                 8 /* eir_clientid */ +
3947                 4 /* eir_sequenceid */ +
3948                 4 /* eir_flags */ +
3949                 4 /* spr_how */);
3950         if (!p)
3951                 return nfserr_resource;
3952
3953         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3954         *p++ = cpu_to_be32(exid->seqid);
3955         *p++ = cpu_to_be32(exid->flags);
3956
3957         *p++ = cpu_to_be32(exid->spa_how);
3958
3959         switch (exid->spa_how) {
3960         case SP4_NONE:
3961                 break;
3962         case SP4_MACH_CRED:
3963                 /* spo_must_enforce bitmap: */
3964                 status = nfsd4_encode_bitmap(xdr,
3965                                         exid->spo_must_enforce[0],
3966                                         exid->spo_must_enforce[1],
3967                                         exid->spo_must_enforce[2]);
3968                 if (status)
3969                         goto out;
3970                 /* spo_must_allow bitmap: */
3971                 status = nfsd4_encode_bitmap(xdr,
3972                                         exid->spo_must_allow[0],
3973                                         exid->spo_must_allow[1],
3974                                         exid->spo_must_allow[2]);
3975                 if (status)
3976                         goto out;
3977                 break;
3978         default:
3979                 WARN_ON_ONCE(1);
3980         }
3981
3982         p = xdr_reserve_space(xdr,
3983                 8 /* so_minor_id */ +
3984                 4 /* so_major_id.len */ +
3985                 (XDR_QUADLEN(major_id_sz) * 4) +
3986                 4 /* eir_server_scope.len */ +
3987                 (XDR_QUADLEN(server_scope_sz) * 4) +
3988                 4 /* eir_server_impl_id.count (0) */);
3989         if (!p)
3990                 return nfserr_resource;
3991
3992         /* The server_owner struct */
3993         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3994         /* major id */
3995         p = xdr_encode_opaque(p, major_id, major_id_sz);
3996
3997         /* Server scope */
3998         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3999
4000         /* Implementation id */
4001         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
4002         return 0;
4003 out:
4004         return status;
4005 }
4006
4007 static __be32
4008 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4009                             struct nfsd4_create_session *sess)
4010 {
4011         struct xdr_stream *xdr = &resp->xdr;
4012         __be32 *p;
4013
4014         if (nfserr)
4015                 return nfserr;
4016
4017         p = xdr_reserve_space(xdr, 24);
4018         if (!p)
4019                 return nfserr_resource;
4020         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4021                                         NFS4_MAX_SESSIONID_LEN);
4022         *p++ = cpu_to_be32(sess->seqid);
4023         *p++ = cpu_to_be32(sess->flags);
4024
4025         p = xdr_reserve_space(xdr, 28);
4026         if (!p)
4027                 return nfserr_resource;
4028         *p++ = cpu_to_be32(0); /* headerpadsz */
4029         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4030         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4031         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4032         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4033         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4034         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4035
4036         if (sess->fore_channel.nr_rdma_attrs) {
4037                 p = xdr_reserve_space(xdr, 4);
4038                 if (!p)
4039                         return nfserr_resource;
4040                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4041         }
4042
4043         p = xdr_reserve_space(xdr, 28);
4044         if (!p)
4045                 return nfserr_resource;
4046         *p++ = cpu_to_be32(0); /* headerpadsz */
4047         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4048         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4049         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4050         *p++ = cpu_to_be32(sess->back_channel.maxops);
4051         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4052         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4053
4054         if (sess->back_channel.nr_rdma_attrs) {
4055                 p = xdr_reserve_space(xdr, 4);
4056                 if (!p)
4057                         return nfserr_resource;
4058                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4059         }
4060         return 0;
4061 }
4062
4063 static __be32
4064 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4065                       struct nfsd4_sequence *seq)
4066 {
4067         struct xdr_stream *xdr = &resp->xdr;
4068         __be32 *p;
4069
4070         if (nfserr)
4071                 return nfserr;
4072
4073         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4074         if (!p)
4075                 return nfserr_resource;
4076         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4077                                         NFS4_MAX_SESSIONID_LEN);
4078         *p++ = cpu_to_be32(seq->seqid);
4079         *p++ = cpu_to_be32(seq->slotid);
4080         /* Note slotid's are numbered from zero: */
4081         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4082         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4083         *p++ = cpu_to_be32(seq->status_flags);
4084
4085         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4086         return 0;
4087 }
4088
4089 static __be32
4090 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4091                           struct nfsd4_test_stateid *test_stateid)
4092 {
4093         struct xdr_stream *xdr = &resp->xdr;
4094         struct nfsd4_test_stateid_id *stateid, *next;
4095         __be32 *p;
4096
4097         if (nfserr)
4098                 return nfserr;
4099
4100         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4101         if (!p)
4102                 return nfserr_resource;
4103         *p++ = htonl(test_stateid->ts_num_ids);
4104
4105         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4106                 *p++ = stateid->ts_id_status;
4107         }
4108
4109         return nfserr;
4110 }
4111
4112 #ifdef CONFIG_NFSD_PNFS
4113 static __be32
4114 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4115                 struct nfsd4_getdeviceinfo *gdev)
4116 {
4117         struct xdr_stream *xdr = &resp->xdr;
4118         const struct nfsd4_layout_ops *ops =
4119                 nfsd4_layout_ops[gdev->gd_layout_type];
4120         u32 starting_len = xdr->buf->len, needed_len;
4121         __be32 *p;
4122
4123         dprintk("%s: err %d\n", __func__, be32_to_cpu(nfserr));
4124         if (nfserr)
4125                 goto out;
4126
4127         nfserr = nfserr_resource;
4128         p = xdr_reserve_space(xdr, 4);
4129         if (!p)
4130                 goto out;
4131
4132         *p++ = cpu_to_be32(gdev->gd_layout_type);
4133
4134         /* If maxcount is 0 then just update notifications */
4135         if (gdev->gd_maxcount != 0) {
4136                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4137                 if (nfserr) {
4138                         /*
4139                          * We don't bother to burden the layout drivers with
4140                          * enforcing gd_maxcount, just tell the client to
4141                          * come back with a bigger buffer if it's not enough.
4142                          */
4143                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4144                                 goto toosmall;
4145                         goto out;
4146                 }
4147         }
4148
4149         nfserr = nfserr_resource;
4150         if (gdev->gd_notify_types) {
4151                 p = xdr_reserve_space(xdr, 4 + 4);
4152                 if (!p)
4153                         goto out;
4154                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4155                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4156         } else {
4157                 p = xdr_reserve_space(xdr, 4);
4158                 if (!p)
4159                         goto out;
4160                 *p++ = 0;
4161         }
4162
4163         nfserr = 0;
4164 out:
4165         kfree(gdev->gd_device);
4166         dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4167         return nfserr;
4168
4169 toosmall:
4170         dprintk("%s: maxcount too small\n", __func__);
4171         needed_len = xdr->buf->len + 4 /* notifications */;
4172         xdr_truncate_encode(xdr, starting_len);
4173         p = xdr_reserve_space(xdr, 4);
4174         if (!p) {
4175                 nfserr = nfserr_resource;
4176         } else {
4177                 *p++ = cpu_to_be32(needed_len);
4178                 nfserr = nfserr_toosmall;
4179         }
4180         goto out;
4181 }
4182
4183 static __be32
4184 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4185                 struct nfsd4_layoutget *lgp)
4186 {
4187         struct xdr_stream *xdr = &resp->xdr;
4188         const struct nfsd4_layout_ops *ops =
4189                 nfsd4_layout_ops[lgp->lg_layout_type];
4190         __be32 *p;
4191
4192         dprintk("%s: err %d\n", __func__, nfserr);
4193         if (nfserr)
4194                 goto out;
4195
4196         nfserr = nfserr_resource;
4197         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4198         if (!p)
4199                 goto out;
4200
4201         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4202         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4203         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4204                                     sizeof(stateid_opaque_t));
4205
4206         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4207         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4208         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4209         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4210         *p++ = cpu_to_be32(lgp->lg_layout_type);
4211
4212         nfserr = ops->encode_layoutget(xdr, lgp);
4213 out:
4214         kfree(lgp->lg_content);
4215         return nfserr;
4216 }
4217
4218 static __be32
4219 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4220                           struct nfsd4_layoutcommit *lcp)
4221 {
4222         struct xdr_stream *xdr = &resp->xdr;
4223         __be32 *p;
4224
4225         if (nfserr)
4226                 return nfserr;
4227
4228         p = xdr_reserve_space(xdr, 4);
4229         if (!p)
4230                 return nfserr_resource;
4231         *p++ = cpu_to_be32(lcp->lc_size_chg);
4232         if (lcp->lc_size_chg) {
4233                 p = xdr_reserve_space(xdr, 8);
4234                 if (!p)
4235                         return nfserr_resource;
4236                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4237         }
4238
4239         return nfs_ok;
4240 }
4241
4242 static __be32
4243 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4244                 struct nfsd4_layoutreturn *lrp)
4245 {
4246         struct xdr_stream *xdr = &resp->xdr;
4247         __be32 *p;
4248
4249         if (nfserr)
4250                 return nfserr;
4251
4252         p = xdr_reserve_space(xdr, 4);
4253         if (!p)
4254                 return nfserr_resource;
4255         *p++ = cpu_to_be32(lrp->lrs_present);
4256         if (lrp->lrs_present)
4257                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4258         return nfs_ok;
4259 }
4260 #endif /* CONFIG_NFSD_PNFS */
4261
4262 static __be32
4263 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4264 {
4265         __be32 *p;
4266
4267         p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4268         if (!p)
4269                 return nfserr_resource;
4270
4271         *p++ = cpu_to_be32(0);
4272         p = xdr_encode_hyper(p, write->wr_bytes_written);
4273         *p++ = cpu_to_be32(write->wr_stable_how);
4274         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4275                                     NFS4_VERIFIER_SIZE);
4276         return nfs_ok;
4277 }
4278
4279 static __be32
4280 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4281                   struct nfsd4_copy *copy)
4282 {
4283         __be32 *p;
4284
4285         if (!nfserr) {
4286                 nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
4287                 if (nfserr)
4288                         return nfserr;
4289
4290                 p = xdr_reserve_space(&resp->xdr, 4 + 4);
4291                 *p++ = cpu_to_be32(copy->cp_consecutive);
4292                 *p++ = cpu_to_be32(copy->cp_synchronous);
4293         }
4294         return nfserr;
4295 }
4296
4297 static __be32
4298 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4299                   struct nfsd4_seek *seek)
4300 {
4301         __be32 *p;
4302
4303         if (nfserr)
4304                 return nfserr;
4305
4306         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4307         *p++ = cpu_to_be32(seek->seek_eof);
4308         p = xdr_encode_hyper(p, seek->seek_pos);
4309
4310         return nfserr;
4311 }
4312
4313 static __be32
4314 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4315 {
4316         return nfserr;
4317 }
4318
4319 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4320
4321 /*
4322  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4323  * since we don't need to filter out obsolete ops as this is
4324  * done in the decoding phase.
4325  */
4326 static nfsd4_enc nfsd4_enc_ops[] = {
4327         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4328         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4329         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4330         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4331         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4332         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4333         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4334         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4335         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4336         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4337         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4338         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4339         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4340         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4341         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4342         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4343         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4344         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4345         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4346         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4347         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4348         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4349         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4350         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4351         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4352         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4353         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4354         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4355         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4356         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4357         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4358         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4359         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4360         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4361         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4362         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4363         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4364
4365         /* NFSv4.1 operations */
4366         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4367         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4368         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4369         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4370         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4371         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4372         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4373 #ifdef CONFIG_NFSD_PNFS
4374         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4375         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4376         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4377         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4378         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4379 #else
4380         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4381         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4382         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4383         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4384         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4385 #endif
4386         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4387         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4388         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4389         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4390         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4391         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4392         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4393
4394         /* NFSv4.2 operations */
4395         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4396         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
4397         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4398         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4399         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4400         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4401         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4402         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4403         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4404         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4405         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4406         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4407         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4408 };
4409
4410 /*
4411  * Calculate whether we still have space to encode repsize bytes.
4412  * There are two considerations:
4413  *     - For NFS versions >=4.1, the size of the reply must stay within
4414  *       session limits
4415  *     - For all NFS versions, we must stay within limited preallocated
4416  *       buffer space.
4417  *
4418  * This is called before the operation is processed, so can only provide
4419  * an upper estimate.  For some nonidempotent operations (such as
4420  * getattr), it's not necessarily a problem if that estimate is wrong,
4421  * as we can fail it after processing without significant side effects.
4422  */
4423 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4424 {
4425         struct xdr_buf *buf = &resp->rqstp->rq_res;
4426         struct nfsd4_slot *slot = resp->cstate.slot;
4427
4428         if (buf->len + respsize <= buf->buflen)
4429                 return nfs_ok;
4430         if (!nfsd4_has_session(&resp->cstate))
4431                 return nfserr_resource;
4432         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4433                 WARN_ON_ONCE(1);
4434                 return nfserr_rep_too_big_to_cache;
4435         }
4436         return nfserr_rep_too_big;
4437 }
4438
4439 void
4440 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4441 {
4442         struct xdr_stream *xdr = &resp->xdr;
4443         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4444         struct svc_rqst *rqstp = resp->rqstp;
4445         int post_err_offset;
4446         nfsd4_enc encoder;
4447         __be32 *p;
4448
4449         p = xdr_reserve_space(xdr, 8);
4450         if (!p) {
4451                 WARN_ON_ONCE(1);
4452                 return;
4453         }
4454         *p++ = cpu_to_be32(op->opnum);
4455         post_err_offset = xdr->buf->len;
4456
4457         if (op->opnum == OP_ILLEGAL)
4458                 goto status;
4459         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4460                !nfsd4_enc_ops[op->opnum]);
4461         encoder = nfsd4_enc_ops[op->opnum];
4462         op->status = encoder(resp, op->status, &op->u);
4463         xdr_commit_encode(xdr);
4464
4465         /* nfsd4_check_resp_size guarantees enough room for error status */
4466         if (!op->status) {
4467                 int space_needed = 0;
4468                 if (!nfsd4_last_compound_op(rqstp))
4469                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4470                 op->status = nfsd4_check_resp_size(resp, space_needed);
4471         }
4472         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4473                 struct nfsd4_slot *slot = resp->cstate.slot;
4474
4475                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4476                         op->status = nfserr_rep_too_big_to_cache;
4477                 else
4478                         op->status = nfserr_rep_too_big;
4479         }
4480         if (op->status == nfserr_resource ||
4481             op->status == nfserr_rep_too_big ||
4482             op->status == nfserr_rep_too_big_to_cache) {
4483                 /*
4484                  * The operation may have already been encoded or
4485                  * partially encoded.  No op returns anything additional
4486                  * in the case of one of these three errors, so we can
4487                  * just truncate back to after the status.  But it's a
4488                  * bug if we had to do this on a non-idempotent op:
4489                  */
4490                 warn_on_nonidempotent_op(op);
4491                 xdr_truncate_encode(xdr, post_err_offset);
4492         }
4493         if (so) {
4494                 int len = xdr->buf->len - post_err_offset;
4495
4496                 so->so_replay.rp_status = op->status;
4497                 so->so_replay.rp_buflen = len;
4498                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4499                                                 so->so_replay.rp_buf, len);
4500         }
4501 status:
4502         /* Note that op->status is already in network byte order: */
4503         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4504 }
4505
4506 /*
4507  * Encode the reply stored in the stateowner reply cache
4508  *
4509  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4510  * previously sent already encoded operation.
4511  */
4512 void
4513 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4514 {
4515         __be32 *p;
4516         struct nfs4_replay *rp = op->replay;
4517
4518         BUG_ON(!rp);
4519
4520         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4521         if (!p) {
4522                 WARN_ON_ONCE(1);
4523                 return;
4524         }
4525         *p++ = cpu_to_be32(op->opnum);
4526         *p++ = rp->rp_status;  /* already xdr'ed */
4527
4528         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4529 }
4530
4531 int
4532 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4533 {
4534         return xdr_ressize_check(rqstp, p);
4535 }
4536
4537 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4538 {
4539         struct svc_rqst *rqstp = rq;
4540         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4541
4542         if (args->ops != args->iops) {
4543                 kfree(args->ops);
4544                 args->ops = args->iops;
4545         }
4546         kfree(args->tmpp);
4547         args->tmpp = NULL;
4548         while (args->to_free) {
4549                 struct svcxdr_tmpbuf *tb = args->to_free;
4550                 args->to_free = tb->next;
4551                 kfree(tb);
4552         }
4553         return 1;
4554 }
4555
4556 int
4557 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4558 {
4559         if (rqstp->rq_arg.head[0].iov_len % 4) {
4560                 /* client is nuts */
4561                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4562                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4563                 return 0;
4564         }
4565         args->p = p;
4566         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4567         args->pagelist = rqstp->rq_arg.pages;
4568         args->pagelen = rqstp->rq_arg.page_len;
4569         args->tmpp = NULL;
4570         args->to_free = NULL;
4571         args->ops = args->iops;
4572         args->rqstp = rqstp;
4573
4574         return !nfsd4_decode_compound(args);
4575 }
4576
4577 int
4578 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4579 {
4580         /*
4581          * All that remains is to write the tag and operation count...
4582          */
4583         struct xdr_buf *buf = resp->xdr.buf;
4584
4585         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4586                                  buf->tail[0].iov_len);
4587
4588         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4589
4590         p = resp->tagp;
4591         *p++ = htonl(resp->taglen);
4592         memcpy(p, resp->tag, resp->taglen);
4593         p += XDR_QUADLEN(resp->taglen);
4594         *p++ = htonl(resp->opcnt);
4595
4596         nfsd4_sequence_done(resp);
4597         return 1;
4598 }
4599
4600 /*
4601  * Local variables:
4602  *  c-basic-offset: 8
4603  * End:
4604  */