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 + XDR_QUADLEN(argp->pagelen);
 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                 next_decode_page(argp);
1283         }
1284         argp->p += XDR_QUADLEN(len);
1285
1286         DECODE_TAIL;
1287 }
1288
1289 static __be32
1290 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1291 {
1292         DECODE_HEAD;
1293
1294         if (argp->minorversion >= 1)
1295                 return nfserr_notsupp;
1296
1297         READ_BUF(12);
1298         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1299         rlockowner->rl_owner.len = be32_to_cpup(p++);
1300         READ_BUF(rlockowner->rl_owner.len);
1301         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1302
1303         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1304                 return nfserr_inval;
1305         DECODE_TAIL;
1306 }
1307
1308 static __be32
1309 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1310                          struct nfsd4_exchange_id *exid)
1311 {
1312         int dummy, tmp;
1313         DECODE_HEAD;
1314
1315         READ_BUF(NFS4_VERIFIER_SIZE);
1316         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1317
1318         status = nfsd4_decode_opaque(argp, &exid->clname);
1319         if (status)
1320                 return nfserr_bad_xdr;
1321
1322         READ_BUF(4);
1323         exid->flags = be32_to_cpup(p++);
1324
1325         /* Ignore state_protect4_a */
1326         READ_BUF(4);
1327         exid->spa_how = be32_to_cpup(p++);
1328         switch (exid->spa_how) {
1329         case SP4_NONE:
1330                 break;
1331         case SP4_MACH_CRED:
1332                 /* spo_must_enforce */
1333                 status = nfsd4_decode_bitmap(argp,
1334                                         exid->spo_must_enforce);
1335                 if (status)
1336                         goto out;
1337                 /* spo_must_allow */
1338                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1339                 if (status)
1340                         goto out;
1341                 break;
1342         case SP4_SSV:
1343                 /* ssp_ops */
1344                 READ_BUF(4);
1345                 dummy = be32_to_cpup(p++);
1346                 READ_BUF(dummy * 4);
1347                 p += dummy;
1348
1349                 READ_BUF(4);
1350                 dummy = be32_to_cpup(p++);
1351                 READ_BUF(dummy * 4);
1352                 p += dummy;
1353
1354                 /* ssp_hash_algs<> */
1355                 READ_BUF(4);
1356                 tmp = be32_to_cpup(p++);
1357                 while (tmp--) {
1358                         READ_BUF(4);
1359                         dummy = be32_to_cpup(p++);
1360                         READ_BUF(dummy);
1361                         p += XDR_QUADLEN(dummy);
1362                 }
1363
1364                 /* ssp_encr_algs<> */
1365                 READ_BUF(4);
1366                 tmp = be32_to_cpup(p++);
1367                 while (tmp--) {
1368                         READ_BUF(4);
1369                         dummy = be32_to_cpup(p++);
1370                         READ_BUF(dummy);
1371                         p += XDR_QUADLEN(dummy);
1372                 }
1373
1374                 /* ssp_window and ssp_num_gss_handles */
1375                 READ_BUF(8);
1376                 dummy = be32_to_cpup(p++);
1377                 dummy = be32_to_cpup(p++);
1378                 break;
1379         default:
1380                 goto xdr_error;
1381         }
1382
1383         /* Ignore Implementation ID */
1384         READ_BUF(4);    /* nfs_impl_id4 array length */
1385         dummy = be32_to_cpup(p++);
1386
1387         if (dummy > 1)
1388                 goto xdr_error;
1389
1390         if (dummy == 1) {
1391                 /* nii_domain */
1392                 READ_BUF(4);
1393                 dummy = be32_to_cpup(p++);
1394                 READ_BUF(dummy);
1395                 p += XDR_QUADLEN(dummy);
1396
1397                 /* nii_name */
1398                 READ_BUF(4);
1399                 dummy = be32_to_cpup(p++);
1400                 READ_BUF(dummy);
1401                 p += XDR_QUADLEN(dummy);
1402
1403                 /* nii_date */
1404                 READ_BUF(12);
1405                 p += 3;
1406         }
1407         DECODE_TAIL;
1408 }
1409
1410 static __be32
1411 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1412                             struct nfsd4_create_session *sess)
1413 {
1414         DECODE_HEAD;
1415         u32 dummy;
1416
1417         READ_BUF(16);
1418         COPYMEM(&sess->clientid, 8);
1419         sess->seqid = be32_to_cpup(p++);
1420         sess->flags = be32_to_cpup(p++);
1421
1422         /* Fore channel attrs */
1423         READ_BUF(28);
1424         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1425         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1426         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1427         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1428         sess->fore_channel.maxops = be32_to_cpup(p++);
1429         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1430         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1431         if (sess->fore_channel.nr_rdma_attrs == 1) {
1432                 READ_BUF(4);
1433                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1434         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1435                 dprintk("Too many fore channel attr bitmaps!\n");
1436                 goto xdr_error;
1437         }
1438
1439         /* Back channel attrs */
1440         READ_BUF(28);
1441         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1442         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1443         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1444         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1445         sess->back_channel.maxops = be32_to_cpup(p++);
1446         sess->back_channel.maxreqs = be32_to_cpup(p++);
1447         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1448         if (sess->back_channel.nr_rdma_attrs == 1) {
1449                 READ_BUF(4);
1450                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1451         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1452                 dprintk("Too many back channel attr bitmaps!\n");
1453                 goto xdr_error;
1454         }
1455
1456         READ_BUF(4);
1457         sess->callback_prog = be32_to_cpup(p++);
1458         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1459         DECODE_TAIL;
1460 }
1461
1462 static __be32
1463 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1464                              struct nfsd4_destroy_session *destroy_session)
1465 {
1466         DECODE_HEAD;
1467         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1468         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1469
1470         DECODE_TAIL;
1471 }
1472
1473 static __be32
1474 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1475                           struct nfsd4_free_stateid *free_stateid)
1476 {
1477         DECODE_HEAD;
1478
1479         READ_BUF(sizeof(stateid_t));
1480         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1481         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1482
1483         DECODE_TAIL;
1484 }
1485
1486 static __be32
1487 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1488                       struct nfsd4_sequence *seq)
1489 {
1490         DECODE_HEAD;
1491
1492         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1493         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1494         seq->seqid = be32_to_cpup(p++);
1495         seq->slotid = be32_to_cpup(p++);
1496         seq->maxslots = be32_to_cpup(p++);
1497         seq->cachethis = be32_to_cpup(p++);
1498
1499         DECODE_TAIL;
1500 }
1501
1502 static __be32
1503 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1504 {
1505         int i;
1506         __be32 *p, status;
1507         struct nfsd4_test_stateid_id *stateid;
1508
1509         READ_BUF(4);
1510         test_stateid->ts_num_ids = ntohl(*p++);
1511
1512         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1513
1514         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1515                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1516                 if (!stateid) {
1517                         status = nfserrno(-ENOMEM);
1518                         goto out;
1519                 }
1520
1521                 INIT_LIST_HEAD(&stateid->ts_id_list);
1522                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1523
1524                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1525                 if (status)
1526                         goto out;
1527         }
1528
1529         status = 0;
1530 out:
1531         return status;
1532 xdr_error:
1533         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1534         status = nfserr_bad_xdr;
1535         goto out;
1536 }
1537
1538 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1539 {
1540         DECODE_HEAD;
1541
1542         READ_BUF(8);
1543         COPYMEM(&dc->clientid, 8);
1544
1545         DECODE_TAIL;
1546 }
1547
1548 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1549 {
1550         DECODE_HEAD;
1551
1552         READ_BUF(4);
1553         rc->rca_one_fs = be32_to_cpup(p++);
1554
1555         DECODE_TAIL;
1556 }
1557
1558 #ifdef CONFIG_NFSD_PNFS
1559 static __be32
1560 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1561                 struct nfsd4_getdeviceinfo *gdev)
1562 {
1563         DECODE_HEAD;
1564         u32 num, i;
1565
1566         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1567         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1568         gdev->gd_layout_type = be32_to_cpup(p++);
1569         gdev->gd_maxcount = be32_to_cpup(p++);
1570         num = be32_to_cpup(p++);
1571         if (num) {
1572                 READ_BUF(4 * num);
1573                 gdev->gd_notify_types = be32_to_cpup(p++);
1574                 for (i = 1; i < num; i++) {
1575                         if (be32_to_cpup(p++)) {
1576                                 status = nfserr_inval;
1577                                 goto out;
1578                         }
1579                 }
1580         }
1581         DECODE_TAIL;
1582 }
1583
1584 static __be32
1585 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1586                 struct nfsd4_layoutget *lgp)
1587 {
1588         DECODE_HEAD;
1589
1590         READ_BUF(36);
1591         lgp->lg_signal = be32_to_cpup(p++);
1592         lgp->lg_layout_type = be32_to_cpup(p++);
1593         lgp->lg_seg.iomode = be32_to_cpup(p++);
1594         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1595         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1596         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1597
1598         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1599         if (status)
1600                 return status;
1601
1602         READ_BUF(4);
1603         lgp->lg_maxcount = be32_to_cpup(p++);
1604
1605         DECODE_TAIL;
1606 }
1607
1608 static __be32
1609 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1610                 struct nfsd4_layoutcommit *lcp)
1611 {
1612         DECODE_HEAD;
1613         u32 timechange;
1614
1615         READ_BUF(20);
1616         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1617         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1618         lcp->lc_reclaim = be32_to_cpup(p++);
1619
1620         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1621         if (status)
1622                 return status;
1623
1624         READ_BUF(4);
1625         lcp->lc_newoffset = be32_to_cpup(p++);
1626         if (lcp->lc_newoffset) {
1627                 READ_BUF(8);
1628                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1629         } else
1630                 lcp->lc_last_wr = 0;
1631         READ_BUF(4);
1632         timechange = be32_to_cpup(p++);
1633         if (timechange) {
1634                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1635                 if (status)
1636                         return status;
1637         } else {
1638                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1639         }
1640         READ_BUF(8);
1641         lcp->lc_layout_type = be32_to_cpup(p++);
1642
1643         /*
1644          * Save the layout update in XDR format and let the layout driver deal
1645          * with it later.
1646          */
1647         lcp->lc_up_len = be32_to_cpup(p++);
1648         if (lcp->lc_up_len > 0) {
1649                 READ_BUF(lcp->lc_up_len);
1650                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1651         }
1652
1653         DECODE_TAIL;
1654 }
1655
1656 static __be32
1657 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1658                 struct nfsd4_layoutreturn *lrp)
1659 {
1660         DECODE_HEAD;
1661
1662         READ_BUF(16);
1663         lrp->lr_reclaim = be32_to_cpup(p++);
1664         lrp->lr_layout_type = be32_to_cpup(p++);
1665         lrp->lr_seg.iomode = be32_to_cpup(p++);
1666         lrp->lr_return_type = be32_to_cpup(p++);
1667         if (lrp->lr_return_type == RETURN_FILE) {
1668                 READ_BUF(16);
1669                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1670                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1671
1672                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1673                 if (status)
1674                         return status;
1675
1676                 READ_BUF(4);
1677                 lrp->lrf_body_len = be32_to_cpup(p++);
1678                 if (lrp->lrf_body_len > 0) {
1679                         READ_BUF(lrp->lrf_body_len);
1680                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1681                 }
1682         } else {
1683                 lrp->lr_seg.offset = 0;
1684                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1685         }
1686
1687         DECODE_TAIL;
1688 }
1689 #endif /* CONFIG_NFSD_PNFS */
1690
1691 static __be32
1692 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1693                        struct nfsd4_fallocate *fallocate)
1694 {
1695         DECODE_HEAD;
1696
1697         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1698         if (status)
1699                 return status;
1700
1701         READ_BUF(16);
1702         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1703         xdr_decode_hyper(p, &fallocate->falloc_length);
1704
1705         DECODE_TAIL;
1706 }
1707
1708 static __be32
1709 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1710 {
1711         DECODE_HEAD;
1712
1713         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1714         if (status)
1715                 return status;
1716         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1717         if (status)
1718                 return status;
1719
1720         READ_BUF(8 + 8 + 8);
1721         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1722         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1723         p = xdr_decode_hyper(p, &clone->cl_count);
1724         DECODE_TAIL;
1725 }
1726
1727 static __be32
1728 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1729 {
1730         DECODE_HEAD;
1731         unsigned int tmp;
1732
1733         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1734         if (status)
1735                 return status;
1736         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1737         if (status)
1738                 return status;
1739
1740         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1741         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1742         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1743         p = xdr_decode_hyper(p, &copy->cp_count);
1744         copy->cp_consecutive = be32_to_cpup(p++);
1745         copy->cp_synchronous = be32_to_cpup(p++);
1746         tmp = be32_to_cpup(p); /* Source server list not supported */
1747
1748         DECODE_TAIL;
1749 }
1750
1751 static __be32
1752 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1753 {
1754         DECODE_HEAD;
1755
1756         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1757         if (status)
1758                 return status;
1759
1760         READ_BUF(8 + 4);
1761         p = xdr_decode_hyper(p, &seek->seek_offset);
1762         seek->seek_whence = be32_to_cpup(p);
1763
1764         DECODE_TAIL;
1765 }
1766
1767 static __be32
1768 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1769 {
1770         return nfs_ok;
1771 }
1772
1773 static __be32
1774 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1775 {
1776         return nfserr_notsupp;
1777 }
1778
1779 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1780
1781 static nfsd4_dec nfsd4_dec_ops[] = {
1782         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1783         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1784         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1785         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1786         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1787         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1788         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1789         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1790         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1791         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1792         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1793         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1794         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1795         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1796         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1797         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1798         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1799         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1800         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1801         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1802         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1803         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1804         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1805         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1806         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1807         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1808         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1809         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1810         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1811         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1812         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1813         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1814         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1815         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1816         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1817         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1818         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1819
1820         /* new operations for NFSv4.1 */
1821         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1822         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1823         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1824         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1825         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1826         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1827         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1828 #ifdef CONFIG_NFSD_PNFS
1829         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1830         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1831         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1832         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1833         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1834 #else
1835         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1836         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1837         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1838         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1839         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1840 #endif
1841         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1842         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1843         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1844         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1845         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1846         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1847         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1848
1849         /* new operations for NFSv4.2 */
1850         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1851         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1852         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1853         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1854         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1855         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1856         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1857         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1858         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1859         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1860         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1861         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1862         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1863 };
1864
1865 static inline bool
1866 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1867 {
1868         if (op->opnum < FIRST_NFS4_OP)
1869                 return false;
1870         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1871                 return false;
1872         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1873                 return false;
1874         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1875                 return false;
1876         return true;
1877 }
1878
1879 static __be32
1880 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1881 {
1882         DECODE_HEAD;
1883         struct nfsd4_op *op;
1884         bool cachethis = false;
1885         int auth_slack= argp->rqstp->rq_auth_slack;
1886         int max_reply = auth_slack + 8; /* opcnt, status */
1887         int readcount = 0;
1888         int readbytes = 0;
1889         int i;
1890
1891         READ_BUF(4);
1892         argp->taglen = be32_to_cpup(p++);
1893         READ_BUF(argp->taglen);
1894         SAVEMEM(argp->tag, argp->taglen);
1895         READ_BUF(8);
1896         argp->minorversion = be32_to_cpup(p++);
1897         argp->opcnt = be32_to_cpup(p++);
1898         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1899
1900         if (argp->taglen > NFSD4_MAX_TAGLEN)
1901                 goto xdr_error;
1902         if (argp->opcnt > 100)
1903                 goto xdr_error;
1904
1905         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1906                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1907                 if (!argp->ops) {
1908                         argp->ops = argp->iops;
1909                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1910                         goto xdr_error;
1911                 }
1912         }
1913
1914         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1915                 argp->opcnt = 0;
1916
1917         for (i = 0; i < argp->opcnt; i++) {
1918                 op = &argp->ops[i];
1919                 op->replay = NULL;
1920
1921                 READ_BUF(4);
1922                 op->opnum = be32_to_cpup(p++);
1923
1924                 if (nfsd4_opnum_in_range(argp, op))
1925                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1926                 else {
1927                         op->opnum = OP_ILLEGAL;
1928                         op->status = nfserr_op_illegal;
1929                 }
1930                 /*
1931                  * We'll try to cache the result in the DRC if any one
1932                  * op in the compound wants to be cached:
1933                  */
1934                 cachethis |= nfsd4_cache_this_op(op);
1935
1936                 if (op->opnum == OP_READ) {
1937                         readcount++;
1938                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1939                 } else
1940                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1941                 /*
1942                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
1943                  * (Special case because it will just skip encoding this
1944                  * if it runs out of xdr buffer space, and it is the only
1945                  * operation that behaves this way.)
1946                  */
1947                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1948                         max_reply += NFS4_OPAQUE_LIMIT;
1949
1950                 if (op->status) {
1951                         argp->opcnt = i+1;
1952                         break;
1953                 }
1954         }
1955         /* Sessions make the DRC unnecessary: */
1956         if (argp->minorversion)
1957                 cachethis = false;
1958         svc_reserve(argp->rqstp, max_reply + readbytes);
1959         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1960
1961         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1962                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1963
1964         DECODE_TAIL;
1965 }
1966
1967 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
1968                              struct svc_export *exp)
1969 {
1970         if (exp->ex_flags & NFSEXP_V4ROOT) {
1971                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
1972                 *p++ = 0;
1973         } else if (IS_I_VERSION(inode)) {
1974                 p = xdr_encode_hyper(p, nfsd4_change_attribute(inode));
1975         } else {
1976                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1977                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1978         }
1979         return p;
1980 }
1981
1982 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1983 {
1984         *p++ = cpu_to_be32(c->atomic);
1985         if (c->change_supported) {
1986                 p = xdr_encode_hyper(p, c->before_change);
1987                 p = xdr_encode_hyper(p, c->after_change);
1988         } else {
1989                 *p++ = cpu_to_be32(c->before_ctime_sec);
1990                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1991                 *p++ = cpu_to_be32(c->after_ctime_sec);
1992                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1993         }
1994         return p;
1995 }
1996
1997 /* Encode as an array of strings the string given with components
1998  * separated @sep, escaped with esc_enter and esc_exit.
1999  */
2000 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2001                                           char *components, char esc_enter,
2002                                           char esc_exit)
2003 {
2004         __be32 *p;
2005         __be32 pathlen;
2006         int pathlen_offset;
2007         int strlen, count=0;
2008         char *str, *end, *next;
2009
2010         dprintk("nfsd4_encode_components(%s)\n", components);
2011
2012         pathlen_offset = xdr->buf->len;
2013         p = xdr_reserve_space(xdr, 4);
2014         if (!p)
2015                 return nfserr_resource;
2016         p++; /* We will fill this in with @count later */
2017
2018         end = str = components;
2019         while (*end) {
2020                 bool found_esc = false;
2021
2022                 /* try to parse as esc_start, ..., esc_end, sep */
2023                 if (*str == esc_enter) {
2024                         for (; *end && (*end != esc_exit); end++)
2025                                 /* find esc_exit or end of string */;
2026                         next = end + 1;
2027                         if (*end && (!*next || *next == sep)) {
2028                                 str++;
2029                                 found_esc = true;
2030                         }
2031                 }
2032
2033                 if (!found_esc)
2034                         for (; *end && (*end != sep); end++)
2035                                 /* find sep or end of string */;
2036
2037                 strlen = end - str;
2038                 if (strlen) {
2039                         p = xdr_reserve_space(xdr, strlen + 4);
2040                         if (!p)
2041                                 return nfserr_resource;
2042                         p = xdr_encode_opaque(p, str, strlen);
2043                         count++;
2044                 }
2045                 else
2046                         end++;
2047                 if (found_esc)
2048                         end = next;
2049
2050                 str = end;
2051         }
2052         pathlen = htonl(count);
2053         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2054         return 0;
2055 }
2056
2057 /* Encode as an array of strings the string given with components
2058  * separated @sep.
2059  */
2060 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2061                                       char *components)
2062 {
2063         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2064 }
2065
2066 /*
2067  * encode a location element of a fs_locations structure
2068  */
2069 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2070                                         struct nfsd4_fs_location *location)
2071 {
2072         __be32 status;
2073
2074         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2075                                                 '[', ']');
2076         if (status)
2077                 return status;
2078         status = nfsd4_encode_components(xdr, '/', location->path);
2079         if (status)
2080                 return status;
2081         return 0;
2082 }
2083
2084 /*
2085  * Encode a path in RFC3530 'pathname4' format
2086  */
2087 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2088                                 const struct path *root,
2089                                 const struct path *path)
2090 {
2091         struct path cur = *path;
2092         __be32 *p;
2093         struct dentry **components = NULL;
2094         unsigned int ncomponents = 0;
2095         __be32 err = nfserr_jukebox;
2096
2097         dprintk("nfsd4_encode_components(");
2098
2099         path_get(&cur);
2100         /* First walk the path up to the nfsd root, and store the
2101          * dentries/path components in an array.
2102          */
2103         for (;;) {
2104                 if (path_equal(&cur, root))
2105                         break;
2106                 if (cur.dentry == cur.mnt->mnt_root) {
2107                         if (follow_up(&cur))
2108                                 continue;
2109                         goto out_free;
2110                 }
2111                 if ((ncomponents & 15) == 0) {
2112                         struct dentry **new;
2113                         new = krealloc(components,
2114                                         sizeof(*new) * (ncomponents + 16),
2115                                         GFP_KERNEL);
2116                         if (!new)
2117                                 goto out_free;
2118                         components = new;
2119                 }
2120                 components[ncomponents++] = cur.dentry;
2121                 cur.dentry = dget_parent(cur.dentry);
2122         }
2123         err = nfserr_resource;
2124         p = xdr_reserve_space(xdr, 4);
2125         if (!p)
2126                 goto out_free;
2127         *p++ = cpu_to_be32(ncomponents);
2128
2129         while (ncomponents) {
2130                 struct dentry *dentry = components[ncomponents - 1];
2131                 unsigned int len;
2132
2133                 spin_lock(&dentry->d_lock);
2134                 len = dentry->d_name.len;
2135                 p = xdr_reserve_space(xdr, len + 4);
2136                 if (!p) {
2137                         spin_unlock(&dentry->d_lock);
2138                         goto out_free;
2139                 }
2140                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2141                 dprintk("/%pd", dentry);
2142                 spin_unlock(&dentry->d_lock);
2143                 dput(dentry);
2144                 ncomponents--;
2145         }
2146
2147         err = 0;
2148 out_free:
2149         dprintk(")\n");
2150         while (ncomponents)
2151                 dput(components[--ncomponents]);
2152         kfree(components);
2153         path_put(&cur);
2154         return err;
2155 }
2156
2157 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2158                         struct svc_rqst *rqstp, const struct path *path)
2159 {
2160         struct svc_export *exp_ps;
2161         __be32 res;
2162
2163         exp_ps = rqst_find_fsidzero_export(rqstp);
2164         if (IS_ERR(exp_ps))
2165                 return nfserrno(PTR_ERR(exp_ps));
2166         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2167         exp_put(exp_ps);
2168         return res;
2169 }
2170
2171 /*
2172  *  encode a fs_locations structure
2173  */
2174 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2175                         struct svc_rqst *rqstp, struct svc_export *exp)
2176 {
2177         __be32 status;
2178         int i;
2179         __be32 *p;
2180         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2181
2182         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2183         if (status)
2184                 return status;
2185         p = xdr_reserve_space(xdr, 4);
2186         if (!p)
2187                 return nfserr_resource;
2188         *p++ = cpu_to_be32(fslocs->locations_count);
2189         for (i=0; i<fslocs->locations_count; i++) {
2190                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2191                 if (status)
2192                         return status;
2193         }
2194         return 0;
2195 }
2196
2197 static u32 nfs4_file_type(umode_t mode)
2198 {
2199         switch (mode & S_IFMT) {
2200         case S_IFIFO:   return NF4FIFO;
2201         case S_IFCHR:   return NF4CHR;
2202         case S_IFDIR:   return NF4DIR;
2203         case S_IFBLK:   return NF4BLK;
2204         case S_IFLNK:   return NF4LNK;
2205         case S_IFREG:   return NF4REG;
2206         case S_IFSOCK:  return NF4SOCK;
2207         default:        return NF4BAD;
2208         };
2209 }
2210
2211 static inline __be32
2212 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2213                      struct nfs4_ace *ace)
2214 {
2215         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2216                 return nfs4_acl_write_who(xdr, ace->whotype);
2217         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2218                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2219         else
2220                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2221 }
2222
2223 static inline __be32
2224 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2225 {
2226         __be32          *p;
2227         unsigned long   i = hweight_long(layout_types);
2228
2229         p = xdr_reserve_space(xdr, 4 + 4 * i);
2230         if (!p)
2231                 return nfserr_resource;
2232
2233         *p++ = cpu_to_be32(i);
2234
2235         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2236                 if (layout_types & (1 << i))
2237                         *p++ = cpu_to_be32(i);
2238
2239         return 0;
2240 }
2241
2242 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2243                               FATTR4_WORD0_RDATTR_ERROR)
2244 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2245 #define WORD2_ABSENT_FS_ATTRS 0
2246
2247 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2248 static inline __be32
2249 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2250                             void *context, int len)
2251 {
2252         __be32 *p;
2253
2254         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2255         if (!p)
2256                 return nfserr_resource;
2257
2258         /*
2259          * For now we use a 0 here to indicate the null translation; in
2260          * the future we may place a call to translation code here.
2261          */
2262         *p++ = cpu_to_be32(0); /* lfs */
2263         *p++ = cpu_to_be32(0); /* pi */
2264         p = xdr_encode_opaque(p, context, len);
2265         return 0;
2266 }
2267 #else
2268 static inline __be32
2269 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2270                             void *context, int len)
2271 { return 0; }
2272 #endif
2273
2274 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2275 {
2276         /* As per referral draft:  */
2277         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2278             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2279                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2280                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2281                         *rdattr_err = NFSERR_MOVED;
2282                 else
2283                         return nfserr_moved;
2284         }
2285         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2286         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2287         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2288         return 0;
2289 }
2290
2291
2292 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2293 {
2294         struct path path = exp->ex_path;
2295         int err;
2296
2297         path_get(&path);
2298         while (follow_up(&path)) {
2299                 if (path.dentry != path.mnt->mnt_root)
2300                         break;
2301         }
2302         err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2303         path_put(&path);
2304         return err;
2305 }
2306
2307 static __be32
2308 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2309 {
2310         __be32 *p;
2311
2312         if (bmval2) {
2313                 p = xdr_reserve_space(xdr, 16);
2314                 if (!p)
2315                         goto out_resource;
2316                 *p++ = cpu_to_be32(3);
2317                 *p++ = cpu_to_be32(bmval0);
2318                 *p++ = cpu_to_be32(bmval1);
2319                 *p++ = cpu_to_be32(bmval2);
2320         } else if (bmval1) {
2321                 p = xdr_reserve_space(xdr, 12);
2322                 if (!p)
2323                         goto out_resource;
2324                 *p++ = cpu_to_be32(2);
2325                 *p++ = cpu_to_be32(bmval0);
2326                 *p++ = cpu_to_be32(bmval1);
2327         } else {
2328                 p = xdr_reserve_space(xdr, 8);
2329                 if (!p)
2330                         goto out_resource;
2331                 *p++ = cpu_to_be32(1);
2332                 *p++ = cpu_to_be32(bmval0);
2333         }
2334
2335         return 0;
2336 out_resource:
2337         return nfserr_resource;
2338 }
2339
2340 /*
2341  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2342  * ourselves.
2343  */
2344 static __be32
2345 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2346                 struct svc_export *exp,
2347                 struct dentry *dentry, u32 *bmval,
2348                 struct svc_rqst *rqstp, int ignore_crossmnt)
2349 {
2350         u32 bmval0 = bmval[0];
2351         u32 bmval1 = bmval[1];
2352         u32 bmval2 = bmval[2];
2353         struct kstat stat;
2354         struct svc_fh *tempfh = NULL;
2355         struct kstatfs statfs;
2356         __be32 *p;
2357         int starting_len = xdr->buf->len;
2358         int attrlen_offset;
2359         __be32 attrlen;
2360         u32 dummy;
2361         u64 dummy64;
2362         u32 rdattr_err = 0;
2363         __be32 status;
2364         int err;
2365         struct nfs4_acl *acl = NULL;
2366         void *context = NULL;
2367         int contextlen;
2368         bool contextsupport = false;
2369         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2370         u32 minorversion = resp->cstate.minorversion;
2371         struct path path = {
2372                 .mnt    = exp->ex_path.mnt,
2373                 .dentry = dentry,
2374         };
2375         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2376
2377         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2378         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2379
2380         if (exp->ex_fslocs.migrated) {
2381                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2382                 if (status)
2383                         goto out;
2384         }
2385
2386         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2387         if (err)
2388                 goto out_nfserr;
2389         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2390                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2391             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2392                        FATTR4_WORD1_SPACE_TOTAL))) {
2393                 err = vfs_statfs(&path, &statfs);
2394                 if (err)
2395                         goto out_nfserr;
2396         }
2397         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2398                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2399                 status = nfserr_jukebox;
2400                 if (!tempfh)
2401                         goto out;
2402                 fh_init(tempfh, NFS4_FHSIZE);
2403                 status = fh_compose(tempfh, exp, dentry, NULL);
2404                 if (status)
2405                         goto out;
2406                 fhp = tempfh;
2407         }
2408         if (bmval0 & FATTR4_WORD0_ACL) {
2409                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2410                 if (err == -EOPNOTSUPP)
2411                         bmval0 &= ~FATTR4_WORD0_ACL;
2412                 else if (err == -EINVAL) {
2413                         status = nfserr_attrnotsupp;
2414                         goto out;
2415                 } else if (err != 0)
2416                         goto out_nfserr;
2417         }
2418
2419 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2420         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2421              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2422                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2423                         err = security_inode_getsecctx(d_inode(dentry),
2424                                                 &context, &contextlen);
2425                 else
2426                         err = -EOPNOTSUPP;
2427                 contextsupport = (err == 0);
2428                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2429                         if (err == -EOPNOTSUPP)
2430                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2431                         else if (err)
2432                                 goto out_nfserr;
2433                 }
2434         }
2435 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2436
2437         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2438         if (status)
2439                 goto out;
2440
2441         attrlen_offset = xdr->buf->len;
2442         p = xdr_reserve_space(xdr, 4);
2443         if (!p)
2444                 goto out_resource;
2445         p++;                /* to be backfilled later */
2446
2447         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2448                 u32 supp[3];
2449
2450                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2451
2452                 if (!IS_POSIXACL(dentry->d_inode))
2453                         supp[0] &= ~FATTR4_WORD0_ACL;
2454                 if (!contextsupport)
2455                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2456                 if (!supp[2]) {
2457                         p = xdr_reserve_space(xdr, 12);
2458                         if (!p)
2459                                 goto out_resource;
2460                         *p++ = cpu_to_be32(2);
2461                         *p++ = cpu_to_be32(supp[0]);
2462                         *p++ = cpu_to_be32(supp[1]);
2463                 } else {
2464                         p = xdr_reserve_space(xdr, 16);
2465                         if (!p)
2466                                 goto out_resource;
2467                         *p++ = cpu_to_be32(3);
2468                         *p++ = cpu_to_be32(supp[0]);
2469                         *p++ = cpu_to_be32(supp[1]);
2470                         *p++ = cpu_to_be32(supp[2]);
2471                 }
2472         }
2473         if (bmval0 & FATTR4_WORD0_TYPE) {
2474                 p = xdr_reserve_space(xdr, 4);
2475                 if (!p)
2476                         goto out_resource;
2477                 dummy = nfs4_file_type(stat.mode);
2478                 if (dummy == NF4BAD) {
2479                         status = nfserr_serverfault;
2480                         goto out;
2481                 }
2482                 *p++ = cpu_to_be32(dummy);
2483         }
2484         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2485                 p = xdr_reserve_space(xdr, 4);
2486                 if (!p)
2487                         goto out_resource;
2488                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2489                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2490                 else
2491                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2492                                                 NFS4_FH_VOL_RENAME);
2493         }
2494         if (bmval0 & FATTR4_WORD0_CHANGE) {
2495                 p = xdr_reserve_space(xdr, 8);
2496                 if (!p)
2497                         goto out_resource;
2498                 p = encode_change(p, &stat, d_inode(dentry), exp);
2499         }
2500         if (bmval0 & FATTR4_WORD0_SIZE) {
2501                 p = xdr_reserve_space(xdr, 8);
2502                 if (!p)
2503                         goto out_resource;
2504                 p = xdr_encode_hyper(p, stat.size);
2505         }
2506         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2507                 p = xdr_reserve_space(xdr, 4);
2508                 if (!p)
2509                         goto out_resource;
2510                 *p++ = cpu_to_be32(1);
2511         }
2512         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2513                 p = xdr_reserve_space(xdr, 4);
2514                 if (!p)
2515                         goto out_resource;
2516                 *p++ = cpu_to_be32(1);
2517         }
2518         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2519                 p = xdr_reserve_space(xdr, 4);
2520                 if (!p)
2521                         goto out_resource;
2522                 *p++ = cpu_to_be32(0);
2523         }
2524         if (bmval0 & FATTR4_WORD0_FSID) {
2525                 p = xdr_reserve_space(xdr, 16);
2526                 if (!p)
2527                         goto out_resource;
2528                 if (exp->ex_fslocs.migrated) {
2529                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2530                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2531                 } else switch(fsid_source(fhp)) {
2532                 case FSIDSOURCE_FSID:
2533                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2534                         p = xdr_encode_hyper(p, (u64)0);
2535                         break;
2536                 case FSIDSOURCE_DEV:
2537                         *p++ = cpu_to_be32(0);
2538                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2539                         *p++ = cpu_to_be32(0);
2540                         *p++ = cpu_to_be32(MINOR(stat.dev));
2541                         break;
2542                 case FSIDSOURCE_UUID:
2543                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2544                                                                 EX_UUID_LEN);
2545                         break;
2546                 }
2547         }
2548         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2549                 p = xdr_reserve_space(xdr, 4);
2550                 if (!p)
2551                         goto out_resource;
2552                 *p++ = cpu_to_be32(0);
2553         }
2554         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2555                 p = xdr_reserve_space(xdr, 4);
2556                 if (!p)
2557                         goto out_resource;
2558                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2559         }
2560         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2561                 p = xdr_reserve_space(xdr, 4);
2562                 if (!p)
2563                         goto out_resource;
2564                 *p++ = cpu_to_be32(rdattr_err);
2565         }
2566         if (bmval0 & FATTR4_WORD0_ACL) {
2567                 struct nfs4_ace *ace;
2568
2569                 if (acl == NULL) {
2570                         p = xdr_reserve_space(xdr, 4);
2571                         if (!p)
2572                                 goto out_resource;
2573
2574                         *p++ = cpu_to_be32(0);
2575                         goto out_acl;
2576                 }
2577                 p = xdr_reserve_space(xdr, 4);
2578                 if (!p)
2579                         goto out_resource;
2580                 *p++ = cpu_to_be32(acl->naces);
2581
2582                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2583                         p = xdr_reserve_space(xdr, 4*3);
2584                         if (!p)
2585                                 goto out_resource;
2586                         *p++ = cpu_to_be32(ace->type);
2587                         *p++ = cpu_to_be32(ace->flag);
2588                         *p++ = cpu_to_be32(ace->access_mask &
2589                                                         NFS4_ACE_MASK_ALL);
2590                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2591                         if (status)
2592                                 goto out;
2593                 }
2594         }
2595 out_acl:
2596         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2597                 p = xdr_reserve_space(xdr, 4);
2598                 if (!p)
2599                         goto out_resource;
2600                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2601                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2602         }
2603         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2604                 p = xdr_reserve_space(xdr, 4);
2605                 if (!p)
2606                         goto out_resource;
2607                 *p++ = cpu_to_be32(1);
2608         }
2609         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2610                 p = xdr_reserve_space(xdr, 4);
2611                 if (!p)
2612                         goto out_resource;
2613                 *p++ = cpu_to_be32(0);
2614         }
2615         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2616                 p = xdr_reserve_space(xdr, 4);
2617                 if (!p)
2618                         goto out_resource;
2619                 *p++ = cpu_to_be32(1);
2620         }
2621         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2622                 p = xdr_reserve_space(xdr, 4);
2623                 if (!p)
2624                         goto out_resource;
2625                 *p++ = cpu_to_be32(1);
2626         }
2627         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2628                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2629                 if (!p)
2630                         goto out_resource;
2631                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2632                                         fhp->fh_handle.fh_size);
2633         }
2634         if (bmval0 & FATTR4_WORD0_FILEID) {
2635                 p = xdr_reserve_space(xdr, 8);
2636                 if (!p)
2637                         goto out_resource;
2638                 p = xdr_encode_hyper(p, stat.ino);
2639         }
2640         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2641                 p = xdr_reserve_space(xdr, 8);
2642                 if (!p)
2643                         goto out_resource;
2644                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2645         }
2646         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2647                 p = xdr_reserve_space(xdr, 8);
2648                 if (!p)
2649                         goto out_resource;
2650                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2651         }
2652         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2653                 p = xdr_reserve_space(xdr, 8);
2654                 if (!p)
2655                         goto out_resource;
2656                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2657         }
2658         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2659                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2660                 if (status)
2661                         goto out;
2662         }
2663         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2664                 p = xdr_reserve_space(xdr, 4);
2665                 if (!p)
2666                         goto out_resource;
2667                 *p++ = cpu_to_be32(1);
2668         }
2669         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2670                 p = xdr_reserve_space(xdr, 8);
2671                 if (!p)
2672                         goto out_resource;
2673                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2674         }
2675         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2676                 p = xdr_reserve_space(xdr, 4);
2677                 if (!p)
2678                         goto out_resource;
2679                 *p++ = cpu_to_be32(255);
2680         }
2681         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2682                 p = xdr_reserve_space(xdr, 4);
2683                 if (!p)
2684                         goto out_resource;
2685                 *p++ = cpu_to_be32(statfs.f_namelen);
2686         }
2687         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2688                 p = xdr_reserve_space(xdr, 8);
2689                 if (!p)
2690                         goto out_resource;
2691                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2692         }
2693         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2694                 p = xdr_reserve_space(xdr, 8);
2695                 if (!p)
2696                         goto out_resource;
2697                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2698         }
2699         if (bmval1 & FATTR4_WORD1_MODE) {
2700                 p = xdr_reserve_space(xdr, 4);
2701                 if (!p)
2702                         goto out_resource;
2703                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2704         }
2705         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2706                 p = xdr_reserve_space(xdr, 4);
2707                 if (!p)
2708                         goto out_resource;
2709                 *p++ = cpu_to_be32(1);
2710         }
2711         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2712                 p = xdr_reserve_space(xdr, 4);
2713                 if (!p)
2714                         goto out_resource;
2715                 *p++ = cpu_to_be32(stat.nlink);
2716         }
2717         if (bmval1 & FATTR4_WORD1_OWNER) {
2718                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2719                 if (status)
2720                         goto out;
2721         }
2722         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2723                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2724                 if (status)
2725                         goto out;
2726         }
2727         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2728                 p = xdr_reserve_space(xdr, 8);
2729                 if (!p)
2730                         goto out_resource;
2731                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2732                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2733         }
2734         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2735                 p = xdr_reserve_space(xdr, 8);
2736                 if (!p)
2737                         goto out_resource;
2738                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2739                 p = xdr_encode_hyper(p, dummy64);
2740         }
2741         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2742                 p = xdr_reserve_space(xdr, 8);
2743                 if (!p)
2744                         goto out_resource;
2745                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2746                 p = xdr_encode_hyper(p, dummy64);
2747         }
2748         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2749                 p = xdr_reserve_space(xdr, 8);
2750                 if (!p)
2751                         goto out_resource;
2752                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2753                 p = xdr_encode_hyper(p, dummy64);
2754         }
2755         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2756                 p = xdr_reserve_space(xdr, 8);
2757                 if (!p)
2758                         goto out_resource;
2759                 dummy64 = (u64)stat.blocks << 9;
2760                 p = xdr_encode_hyper(p, dummy64);
2761         }
2762         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2763                 p = xdr_reserve_space(xdr, 12);
2764                 if (!p)
2765                         goto out_resource;
2766                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2767                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2768         }
2769         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2770                 p = xdr_reserve_space(xdr, 12);
2771                 if (!p)
2772                         goto out_resource;
2773                 *p++ = cpu_to_be32(0);
2774                 *p++ = cpu_to_be32(1);
2775                 *p++ = cpu_to_be32(0);
2776         }
2777         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2778                 p = xdr_reserve_space(xdr, 12);
2779                 if (!p)
2780                         goto out_resource;
2781                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2782                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2783         }
2784         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2785                 p = xdr_reserve_space(xdr, 12);
2786                 if (!p)
2787                         goto out_resource;
2788                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2789                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2790         }
2791         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2792                 struct kstat parent_stat;
2793                 u64 ino = stat.ino;
2794
2795                 p = xdr_reserve_space(xdr, 8);
2796                 if (!p)
2797                         goto out_resource;
2798                 /*
2799                  * Get parent's attributes if not ignoring crossmount
2800                  * and this is the root of a cross-mounted filesystem.
2801                  */
2802                 if (ignore_crossmnt == 0 &&
2803                     dentry == exp->ex_path.mnt->mnt_root) {
2804                         err = get_parent_attributes(exp, &parent_stat);
2805                         if (err)
2806                                 goto out_nfserr;
2807                         ino = parent_stat.ino;
2808                 }
2809                 p = xdr_encode_hyper(p, ino);
2810         }
2811 #ifdef CONFIG_NFSD_PNFS
2812         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2813                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2814                 if (status)
2815                         goto out;
2816         }
2817
2818         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2819                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2820                 if (status)
2821                         goto out;
2822         }
2823
2824         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2825                 p = xdr_reserve_space(xdr, 4);
2826                 if (!p)
2827                         goto out_resource;
2828                 *p++ = cpu_to_be32(stat.blksize);
2829         }
2830 #endif /* CONFIG_NFSD_PNFS */
2831         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2832                 u32 supp[3];
2833
2834                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2835                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2836                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2837                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2838
2839                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2840                 if (status)
2841                         goto out;
2842         }
2843
2844         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2845                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2846                                                                 contextlen);
2847                 if (status)
2848                         goto out;
2849         }
2850
2851         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2852         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2853         status = nfs_ok;
2854
2855 out:
2856 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2857         if (context)
2858                 security_release_secctx(context, contextlen);
2859 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2860         kfree(acl);
2861         if (tempfh) {
2862                 fh_put(tempfh);
2863                 kfree(tempfh);
2864         }
2865         if (status)
2866                 xdr_truncate_encode(xdr, starting_len);
2867         return status;
2868 out_nfserr:
2869         status = nfserrno(err);
2870         goto out;
2871 out_resource:
2872         status = nfserr_resource;
2873         goto out;
2874 }
2875
2876 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2877                                 struct xdr_buf *buf, __be32 *p, int bytes)
2878 {
2879         xdr->scratch.iov_len = 0;
2880         memset(buf, 0, sizeof(struct xdr_buf));
2881         buf->head[0].iov_base = p;
2882         buf->head[0].iov_len = 0;
2883         buf->len = 0;
2884         xdr->buf = buf;
2885         xdr->iov = buf->head;
2886         xdr->p = p;
2887         xdr->end = (void *)p + bytes;
2888         buf->buflen = bytes;
2889 }
2890
2891 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2892                         struct svc_fh *fhp, struct svc_export *exp,
2893                         struct dentry *dentry, u32 *bmval,
2894                         struct svc_rqst *rqstp, int ignore_crossmnt)
2895 {
2896         struct xdr_buf dummy;
2897         struct xdr_stream xdr;
2898         __be32 ret;
2899
2900         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2901         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2902                                                         ignore_crossmnt);
2903         *p = xdr.p;
2904         return ret;
2905 }
2906
2907 static inline int attributes_need_mount(u32 *bmval)
2908 {
2909         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2910                 return 1;
2911         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2912                 return 1;
2913         return 0;
2914 }
2915
2916 static __be32
2917 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2918                         const char *name, int namlen)
2919 {
2920         struct svc_export *exp = cd->rd_fhp->fh_export;
2921         struct dentry *dentry;
2922         __be32 nfserr;
2923         int ignore_crossmnt = 0;
2924
2925         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2926         if (IS_ERR(dentry))
2927                 return nfserrno(PTR_ERR(dentry));
2928         if (d_really_is_negative(dentry)) {
2929                 /*
2930                  * we're not holding the i_mutex here, so there's
2931                  * a window where this directory entry could have gone
2932                  * away.
2933                  */
2934                 dput(dentry);
2935                 return nfserr_noent;
2936         }
2937
2938         exp_get(exp);
2939         /*
2940          * In the case of a mountpoint, the client may be asking for
2941          * attributes that are only properties of the underlying filesystem
2942          * as opposed to the cross-mounted file system. In such a case,
2943          * we will not follow the cross mount and will fill the attribtutes
2944          * directly from the mountpoint dentry.
2945          */
2946         if (nfsd_mountpoint(dentry, exp)) {
2947                 int err;
2948
2949                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2950                                 && !attributes_need_mount(cd->rd_bmval)) {
2951                         ignore_crossmnt = 1;
2952                         goto out_encode;
2953                 }
2954                 /*
2955                  * Why the heck aren't we just using nfsd_lookup??
2956                  * Different "."/".." handling?  Something else?
2957                  * At least, add a comment here to explain....
2958                  */
2959                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2960                 if (err) {
2961                         nfserr = nfserrno(err);
2962                         goto out_put;
2963                 }
2964                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2965                 if (nfserr)
2966                         goto out_put;
2967
2968         }
2969 out_encode:
2970         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2971                                         cd->rd_rqstp, ignore_crossmnt);
2972 out_put:
2973         dput(dentry);
2974         exp_put(exp);
2975         return nfserr;
2976 }
2977
2978 static __be32 *
2979 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2980 {
2981         __be32 *p;
2982
2983         p = xdr_reserve_space(xdr, 20);
2984         if (!p)
2985                 return NULL;
2986         *p++ = htonl(2);
2987         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2988         *p++ = htonl(0);                         /* bmval1 */
2989
2990         *p++ = htonl(4);     /* attribute length */
2991         *p++ = nfserr;       /* no htonl */
2992         return p;
2993 }
2994
2995 static int
2996 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2997                     loff_t offset, u64 ino, unsigned int d_type)
2998 {
2999         struct readdir_cd *ccd = ccdv;
3000         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3001         struct xdr_stream *xdr = cd->xdr;
3002         int start_offset = xdr->buf->len;
3003         int cookie_offset;
3004         u32 name_and_cookie;
3005         int entry_bytes;
3006         __be32 nfserr = nfserr_toosmall;
3007         __be64 wire_offset;
3008         __be32 *p;
3009
3010         /* In nfsv4, "." and ".." never make it onto the wire.. */
3011         if (name && isdotent(name, namlen)) {
3012                 cd->common.err = nfs_ok;
3013                 return 0;
3014         }
3015
3016         if (cd->cookie_offset) {
3017                 wire_offset = cpu_to_be64(offset);
3018                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3019                                                         &wire_offset, 8);
3020         }
3021
3022         p = xdr_reserve_space(xdr, 4);
3023         if (!p)
3024                 goto fail;
3025         *p++ = xdr_one;                             /* mark entry present */
3026         cookie_offset = xdr->buf->len;
3027         p = xdr_reserve_space(xdr, 3*4 + namlen);
3028         if (!p)
3029                 goto fail;
3030         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3031         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3032
3033         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3034         switch (nfserr) {
3035         case nfs_ok:
3036                 break;
3037         case nfserr_resource:
3038                 nfserr = nfserr_toosmall;
3039                 goto fail;
3040         case nfserr_noent:
3041                 xdr_truncate_encode(xdr, start_offset);
3042                 goto skip_entry;
3043         default:
3044                 /*
3045                  * If the client requested the RDATTR_ERROR attribute,
3046                  * we stuff the error code into this attribute
3047                  * and continue.  If this attribute was not requested,
3048                  * then in accordance with the spec, we fail the
3049                  * entire READDIR operation(!)
3050                  */
3051                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3052                         goto fail;
3053                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3054                 if (p == NULL) {
3055                         nfserr = nfserr_toosmall;
3056                         goto fail;
3057                 }
3058         }
3059         nfserr = nfserr_toosmall;
3060         entry_bytes = xdr->buf->len - start_offset;
3061         if (entry_bytes > cd->rd_maxcount)
3062                 goto fail;
3063         cd->rd_maxcount -= entry_bytes;
3064         /*
3065          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3066          * let's always let through the first entry, at least:
3067          */
3068         if (!cd->rd_dircount)
3069                 goto fail;
3070         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3071         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3072                 goto fail;
3073         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3074
3075         cd->cookie_offset = cookie_offset;
3076 skip_entry:
3077         cd->common.err = nfs_ok;
3078         return 0;
3079 fail:
3080         xdr_truncate_encode(xdr, start_offset);
3081         cd->common.err = nfserr;
3082         return -EINVAL;
3083 }
3084
3085 static __be32
3086 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3087 {
3088         __be32 *p;
3089
3090         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3091         if (!p)
3092                 return nfserr_resource;
3093         *p++ = cpu_to_be32(sid->si_generation);
3094         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3095                                         sizeof(stateid_opaque_t));
3096         return 0;
3097 }
3098
3099 static __be32
3100 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3101 {
3102         struct xdr_stream *xdr = &resp->xdr;
3103         __be32 *p;
3104
3105         if (!nfserr) {
3106                 p = xdr_reserve_space(xdr, 8);
3107                 if (!p)
3108                         return nfserr_resource;
3109                 *p++ = cpu_to_be32(access->ac_supported);
3110                 *p++ = cpu_to_be32(access->ac_resp_access);
3111         }
3112         return nfserr;
3113 }
3114
3115 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3116 {
3117         struct xdr_stream *xdr = &resp->xdr;
3118         __be32 *p;
3119
3120         if (!nfserr) {
3121                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3122                 if (!p)
3123                         return nfserr_resource;
3124                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3125                                                 NFS4_MAX_SESSIONID_LEN);
3126                 *p++ = cpu_to_be32(bcts->dir);
3127                 /* Upshifting from TCP to RDMA is not supported */
3128                 *p++ = cpu_to_be32(0);
3129         }
3130         return nfserr;
3131 }
3132
3133 static __be32
3134 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3135 {
3136         struct xdr_stream *xdr = &resp->xdr;
3137
3138         if (!nfserr)
3139                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3140
3141         return nfserr;
3142 }
3143
3144
3145 static __be32
3146 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3147 {
3148         struct xdr_stream *xdr = &resp->xdr;
3149         __be32 *p;
3150
3151         if (!nfserr) {
3152                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3153                 if (!p)
3154                         return nfserr_resource;
3155                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3156                                                 NFS4_VERIFIER_SIZE);
3157         }
3158         return nfserr;
3159 }
3160
3161 static __be32
3162 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3163 {
3164         struct xdr_stream *xdr = &resp->xdr;
3165         __be32 *p;
3166
3167         if (!nfserr) {
3168                 p = xdr_reserve_space(xdr, 20);
3169                 if (!p)
3170                         return nfserr_resource;
3171                 encode_cinfo(p, &create->cr_cinfo);
3172                 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3173                                 create->cr_bmval[1], create->cr_bmval[2]);
3174         }
3175         return nfserr;
3176 }
3177
3178 static __be32
3179 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3180 {
3181         struct svc_fh *fhp = getattr->ga_fhp;
3182         struct xdr_stream *xdr = &resp->xdr;
3183
3184         if (nfserr)
3185                 return nfserr;
3186
3187         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3188                                     getattr->ga_bmval,
3189                                     resp->rqstp, 0);
3190         return nfserr;
3191 }
3192
3193 static __be32
3194 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3195 {
3196         struct xdr_stream *xdr = &resp->xdr;
3197         struct svc_fh *fhp = *fhpp;
3198         unsigned int len;
3199         __be32 *p;
3200
3201         if (!nfserr) {
3202                 len = fhp->fh_handle.fh_size;
3203                 p = xdr_reserve_space(xdr, len + 4);
3204                 if (!p)
3205                         return nfserr_resource;
3206                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3207         }
3208         return nfserr;
3209 }
3210
3211 /*
3212 * Including all fields other than the name, a LOCK4denied structure requires
3213 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3214 */
3215 static __be32
3216 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3217 {
3218         struct xdr_netobj *conf = &ld->ld_owner;
3219         __be32 *p;
3220
3221 again:
3222         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3223         if (!p) {
3224                 /*
3225                  * Don't fail to return the result just because we can't
3226                  * return the conflicting open:
3227                  */
3228                 if (conf->len) {
3229                         kfree(conf->data);
3230                         conf->len = 0;
3231                         conf->data = NULL;
3232                         goto again;
3233                 }
3234                 return nfserr_resource;
3235         }
3236         p = xdr_encode_hyper(p, ld->ld_start);
3237         p = xdr_encode_hyper(p, ld->ld_length);
3238         *p++ = cpu_to_be32(ld->ld_type);
3239         if (conf->len) {
3240                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3241                 p = xdr_encode_opaque(p, conf->data, conf->len);
3242                 kfree(conf->data);
3243         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3244                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3245                 *p++ = cpu_to_be32(0); /* length of owner name */
3246         }
3247         return nfserr_denied;
3248 }
3249
3250 static __be32
3251 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3252 {
3253         struct xdr_stream *xdr = &resp->xdr;
3254
3255         if (!nfserr)
3256                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3257         else if (nfserr == nfserr_denied)
3258                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3259
3260         return nfserr;
3261 }
3262
3263 static __be32
3264 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3265 {
3266         struct xdr_stream *xdr = &resp->xdr;
3267
3268         if (nfserr == nfserr_denied)
3269                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3270         return nfserr;
3271 }
3272
3273 static __be32
3274 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3275 {
3276         struct xdr_stream *xdr = &resp->xdr;
3277
3278         if (!nfserr)
3279                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3280
3281         return nfserr;
3282 }
3283
3284
3285 static __be32
3286 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3287 {
3288         struct xdr_stream *xdr = &resp->xdr;
3289         __be32 *p;
3290
3291         if (!nfserr) {
3292                 p = xdr_reserve_space(xdr, 20);
3293                 if (!p)
3294                         return nfserr_resource;
3295                 p = encode_cinfo(p, &link->li_cinfo);
3296         }
3297         return nfserr;
3298 }
3299
3300
3301 static __be32
3302 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3303 {
3304         struct xdr_stream *xdr = &resp->xdr;
3305         __be32 *p;
3306
3307         if (nfserr)
3308                 goto out;
3309
3310         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3311         if (nfserr)
3312                 goto out;
3313         p = xdr_reserve_space(xdr, 24);
3314         if (!p)
3315                 return nfserr_resource;
3316         p = encode_cinfo(p, &open->op_cinfo);
3317         *p++ = cpu_to_be32(open->op_rflags);
3318
3319         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3320                                         open->op_bmval[2]);
3321         if (nfserr)
3322                 goto out;
3323
3324         p = xdr_reserve_space(xdr, 4);
3325         if (!p)
3326                 return nfserr_resource;
3327
3328         *p++ = cpu_to_be32(open->op_delegate_type);
3329         switch (open->op_delegate_type) {
3330         case NFS4_OPEN_DELEGATE_NONE:
3331                 break;
3332         case NFS4_OPEN_DELEGATE_READ:
3333                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3334                 if (nfserr)
3335                         return nfserr;
3336                 p = xdr_reserve_space(xdr, 20);
3337                 if (!p)
3338                         return nfserr_resource;
3339                 *p++ = cpu_to_be32(open->op_recall);
3340
3341                 /*
3342                  * TODO: ACE's in delegations
3343                  */
3344                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3345                 *p++ = cpu_to_be32(0);
3346                 *p++ = cpu_to_be32(0);
3347                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3348                 break;
3349         case NFS4_OPEN_DELEGATE_WRITE:
3350                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3351                 if (nfserr)
3352                         return nfserr;
3353                 p = xdr_reserve_space(xdr, 32);
3354                 if (!p)
3355                         return nfserr_resource;
3356                 *p++ = cpu_to_be32(0);
3357
3358                 /*
3359                  * TODO: space_limit's in delegations
3360                  */
3361                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3362                 *p++ = cpu_to_be32(~(u32)0);
3363                 *p++ = cpu_to_be32(~(u32)0);
3364
3365                 /*
3366                  * TODO: ACE's in delegations
3367                  */
3368                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3369                 *p++ = cpu_to_be32(0);
3370                 *p++ = cpu_to_be32(0);
3371                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3372                 break;
3373         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3374                 switch (open->op_why_no_deleg) {
3375                 case WND4_CONTENTION:
3376                 case WND4_RESOURCE:
3377                         p = xdr_reserve_space(xdr, 8);
3378                         if (!p)
3379                                 return nfserr_resource;
3380                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3381                         /* deleg signaling not supported yet: */
3382                         *p++ = cpu_to_be32(0);
3383                         break;
3384                 default:
3385                         p = xdr_reserve_space(xdr, 4);
3386                         if (!p)
3387                                 return nfserr_resource;
3388                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3389                 }
3390                 break;
3391         default:
3392                 BUG();
3393         }
3394         /* XXX save filehandle here */
3395 out:
3396         return nfserr;
3397 }
3398
3399 static __be32
3400 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3401 {
3402         struct xdr_stream *xdr = &resp->xdr;
3403
3404         if (!nfserr)
3405                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3406
3407         return nfserr;
3408 }
3409
3410 static __be32
3411 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3412 {
3413         struct xdr_stream *xdr = &resp->xdr;
3414
3415         if (!nfserr)
3416                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3417
3418         return nfserr;
3419 }
3420
3421 static __be32 nfsd4_encode_splice_read(
3422                                 struct nfsd4_compoundres *resp,
3423                                 struct nfsd4_read *read,
3424                                 struct file *file, unsigned long maxcount)
3425 {
3426         struct xdr_stream *xdr = &resp->xdr;
3427         struct xdr_buf *buf = xdr->buf;
3428         u32 eof;
3429         long len;
3430         int space_left;
3431         __be32 nfserr;
3432         __be32 *p = xdr->p - 2;
3433
3434         /* Make sure there will be room for padding if needed */
3435         if (xdr->end - xdr->p < 1)
3436                 return nfserr_resource;
3437
3438         len = maxcount;
3439         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3440                                   read->rd_offset, &maxcount);
3441         if (nfserr) {
3442                 /*
3443                  * nfsd_splice_actor may have already messed with the
3444                  * page length; reset it so as not to confuse
3445                  * xdr_truncate_encode:
3446                  */
3447                 buf->page_len = 0;
3448                 return nfserr;
3449         }
3450
3451         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3452                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3453
3454         *(p++) = htonl(eof);
3455         *(p++) = htonl(maxcount);
3456
3457         buf->page_len = maxcount;
3458         buf->len += maxcount;
3459         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3460                                                         / PAGE_SIZE;
3461
3462         /* Use rest of head for padding and remaining ops: */
3463         buf->tail[0].iov_base = xdr->p;
3464         buf->tail[0].iov_len = 0;
3465         xdr->iov = buf->tail;
3466         if (maxcount&3) {
3467                 int pad = 4 - (maxcount&3);
3468
3469                 *(xdr->p++) = 0;
3470
3471                 buf->tail[0].iov_base += maxcount&3;
3472                 buf->tail[0].iov_len = pad;
3473                 buf->len += pad;
3474         }
3475
3476         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3477                                 buf->buflen - buf->len);
3478         buf->buflen = buf->len + space_left;
3479         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3480
3481         return 0;
3482 }
3483
3484 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3485                                  struct nfsd4_read *read,
3486                                  struct file *file, unsigned long maxcount)
3487 {
3488         struct xdr_stream *xdr = &resp->xdr;
3489         u32 eof;
3490         int v;
3491         int starting_len = xdr->buf->len - 8;
3492         long len;
3493         int thislen;
3494         __be32 nfserr;
3495         __be32 tmp;
3496         __be32 *p;
3497         u32 zzz = 0;
3498         int pad;
3499
3500         len = maxcount;
3501         v = 0;
3502
3503         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3504         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3505         WARN_ON_ONCE(!p);
3506         resp->rqstp->rq_vec[v].iov_base = p;
3507         resp->rqstp->rq_vec[v].iov_len = thislen;
3508         v++;
3509         len -= thislen;
3510
3511         while (len) {
3512                 thislen = min_t(long, len, PAGE_SIZE);
3513                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3514                 WARN_ON_ONCE(!p);
3515                 resp->rqstp->rq_vec[v].iov_base = p;
3516                 resp->rqstp->rq_vec[v].iov_len = thislen;
3517                 v++;
3518                 len -= thislen;
3519         }
3520         read->rd_vlen = v;
3521
3522         len = maxcount;
3523         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3524                         read->rd_vlen, &maxcount);
3525         if (nfserr)
3526                 return nfserr;
3527         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3528
3529         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3530                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3531
3532         tmp = htonl(eof);
3533         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3534         tmp = htonl(maxcount);
3535         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3536
3537         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3538         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3539                                                                 &zzz, pad);
3540         return 0;
3541
3542 }
3543
3544 static __be32
3545 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3546                   struct nfsd4_read *read)
3547 {
3548         unsigned long maxcount;
3549         struct xdr_stream *xdr = &resp->xdr;
3550         struct file *file = read->rd_filp;
3551         int starting_len = xdr->buf->len;
3552         struct raparms *ra = NULL;
3553         __be32 *p;
3554
3555         if (nfserr)
3556                 goto out;
3557
3558         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3559         if (!p) {
3560                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3561                 nfserr = nfserr_resource;
3562                 goto out;
3563         }
3564         if (resp->xdr.buf->page_len &&
3565             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3566                 WARN_ON_ONCE(1);
3567                 nfserr = nfserr_resource;
3568                 goto out;
3569         }
3570         xdr_commit_encode(xdr);
3571
3572         maxcount = svc_max_payload(resp->rqstp);
3573         maxcount = min_t(unsigned long, maxcount,
3574                          (xdr->buf->buflen - xdr->buf->len));
3575         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3576
3577         if (read->rd_tmp_file)
3578                 ra = nfsd_init_raparms(file);
3579
3580         if (file->f_op->splice_read &&
3581             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3582                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3583         else
3584                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3585
3586         if (ra)
3587                 nfsd_put_raparams(file, ra);
3588
3589         if (nfserr)
3590                 xdr_truncate_encode(xdr, starting_len);
3591
3592 out:
3593         if (file)
3594                 fput(file);
3595         return nfserr;
3596 }
3597
3598 static __be32
3599 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3600 {
3601         int maxcount;
3602         __be32 wire_count;
3603         int zero = 0;
3604         struct xdr_stream *xdr = &resp->xdr;
3605         int length_offset = xdr->buf->len;
3606         __be32 *p;
3607
3608         if (nfserr)
3609                 return nfserr;
3610
3611         p = xdr_reserve_space(xdr, 4);
3612         if (!p)
3613                 return nfserr_resource;
3614         maxcount = PAGE_SIZE;
3615
3616         p = xdr_reserve_space(xdr, maxcount);
3617         if (!p)
3618                 return nfserr_resource;
3619         /*
3620          * XXX: By default, vfs_readlink() will truncate symlinks if they
3621          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
3622          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3623          * that truncation occurred, and return NFS4ERR_RESOURCE.
3624          */
3625         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3626                                                 (char *)p, &maxcount);
3627         if (nfserr == nfserr_isdir)
3628                 nfserr = nfserr_inval;
3629         if (nfserr) {
3630                 xdr_truncate_encode(xdr, length_offset);
3631                 return nfserr;
3632         }
3633
3634         wire_count = htonl(maxcount);
3635         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3636         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3637         if (maxcount & 3)
3638                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3639                                                 &zero, 4 - (maxcount&3));
3640         return 0;
3641 }
3642
3643 static __be32
3644 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3645 {
3646         int maxcount;
3647         int bytes_left;
3648         loff_t offset;
3649         __be64 wire_offset;
3650         struct xdr_stream *xdr = &resp->xdr;
3651         int starting_len = xdr->buf->len;
3652         __be32 *p;
3653
3654         if (nfserr)
3655                 return nfserr;
3656
3657         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3658         if (!p)
3659                 return nfserr_resource;
3660
3661         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3662         *p++ = cpu_to_be32(0);
3663         *p++ = cpu_to_be32(0);
3664         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3665                                 - (char *)resp->xdr.buf->head[0].iov_base;
3666
3667         /*
3668          * Number of bytes left for directory entries allowing for the
3669          * final 8 bytes of the readdir and a following failed op:
3670          */
3671         bytes_left = xdr->buf->buflen - xdr->buf->len
3672                         - COMPOUND_ERR_SLACK_SPACE - 8;
3673         if (bytes_left < 0) {
3674                 nfserr = nfserr_resource;
3675                 goto err_no_verf;
3676         }
3677         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3678         /*
3679          * Note the rfc defines rd_maxcount as the size of the
3680          * READDIR4resok structure, which includes the verifier above
3681          * and the 8 bytes encoded at the end of this function:
3682          */
3683         if (maxcount < 16) {
3684                 nfserr = nfserr_toosmall;
3685                 goto err_no_verf;
3686         }
3687         maxcount = min_t(int, maxcount-16, bytes_left);
3688
3689         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3690         if (!readdir->rd_dircount)
3691                 readdir->rd_dircount = INT_MAX;
3692
3693         readdir->xdr = xdr;
3694         readdir->rd_maxcount = maxcount;
3695         readdir->common.err = 0;
3696         readdir->cookie_offset = 0;
3697
3698         offset = readdir->rd_cookie;
3699         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3700                               &offset,
3701                               &readdir->common, nfsd4_encode_dirent);
3702         if (nfserr == nfs_ok &&
3703             readdir->common.err == nfserr_toosmall &&
3704             xdr->buf->len == starting_len + 8) {
3705                 /* nothing encoded; which limit did we hit?: */
3706                 if (maxcount - 16 < bytes_left)
3707                         /* It was the fault of rd_maxcount: */
3708                         nfserr = nfserr_toosmall;
3709                 else
3710                         /* We ran out of buffer space: */
3711                         nfserr = nfserr_resource;
3712         }
3713         if (nfserr)
3714                 goto err_no_verf;
3715
3716         if (readdir->cookie_offset) {
3717                 wire_offset = cpu_to_be64(offset);
3718                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3719                                                         &wire_offset, 8);
3720         }
3721
3722         p = xdr_reserve_space(xdr, 8);
3723         if (!p) {
3724                 WARN_ON_ONCE(1);
3725                 goto err_no_verf;
3726         }
3727         *p++ = 0;       /* no more entries */
3728         *p++ = htonl(readdir->common.err == nfserr_eof);
3729
3730         return 0;
3731 err_no_verf:
3732         xdr_truncate_encode(xdr, starting_len);
3733         return nfserr;
3734 }
3735
3736 static __be32
3737 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3738 {
3739         struct xdr_stream *xdr = &resp->xdr;
3740         __be32 *p;
3741
3742         if (!nfserr) {
3743                 p = xdr_reserve_space(xdr, 20);
3744                 if (!p)
3745                         return nfserr_resource;
3746                 p = encode_cinfo(p, &remove->rm_cinfo);
3747         }
3748         return nfserr;
3749 }
3750
3751 static __be32
3752 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3753 {
3754         struct xdr_stream *xdr = &resp->xdr;
3755         __be32 *p;
3756
3757         if (!nfserr) {
3758                 p = xdr_reserve_space(xdr, 40);
3759                 if (!p)
3760                         return nfserr_resource;
3761                 p = encode_cinfo(p, &rename->rn_sinfo);
3762                 p = encode_cinfo(p, &rename->rn_tinfo);
3763         }
3764         return nfserr;
3765 }
3766
3767 static __be32
3768 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3769                          __be32 nfserr, struct svc_export *exp)
3770 {
3771         u32 i, nflavs, supported;
3772         struct exp_flavor_info *flavs;
3773         struct exp_flavor_info def_flavs[2];
3774         __be32 *p, *flavorsp;
3775         static bool report = true;
3776
3777         if (nfserr)
3778                 goto out;
3779         nfserr = nfserr_resource;
3780         if (exp->ex_nflavors) {
3781                 flavs = exp->ex_flavors;
3782                 nflavs = exp->ex_nflavors;
3783         } else { /* Handling of some defaults in absence of real secinfo: */
3784                 flavs = def_flavs;
3785                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3786                         nflavs = 2;
3787                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3788                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3789                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3790                         nflavs = 1;
3791                         flavs[0].pseudoflavor
3792                                         = svcauth_gss_flavor(exp->ex_client);
3793                 } else {
3794                         nflavs = 1;
3795                         flavs[0].pseudoflavor
3796                                         = exp->ex_client->flavour->flavour;
3797                 }
3798         }
3799
3800         supported = 0;
3801         p = xdr_reserve_space(xdr, 4);
3802         if (!p)
3803                 goto out;
3804         flavorsp = p++;         /* to be backfilled later */
3805
3806         for (i = 0; i < nflavs; i++) {
3807                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3808                 struct rpcsec_gss_info info;
3809
3810                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3811                         supported++;
3812                         p = xdr_reserve_space(xdr, 4 + 4 +
3813                                               XDR_LEN(info.oid.len) + 4 + 4);
3814                         if (!p)
3815                                 goto out;
3816                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3817                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3818                         *p++ = cpu_to_be32(info.qop);
3819                         *p++ = cpu_to_be32(info.service);
3820                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3821                         supported++;
3822                         p = xdr_reserve_space(xdr, 4);
3823                         if (!p)
3824                                 goto out;
3825                         *p++ = cpu_to_be32(pf);
3826                 } else {
3827                         if (report)
3828                                 pr_warn("NFS: SECINFO: security flavor %u "
3829                                         "is not supported\n", pf);
3830                 }
3831         }
3832
3833         if (nflavs != supported)
3834                 report = false;
3835         *flavorsp = htonl(supported);
3836         nfserr = 0;
3837 out:
3838         if (exp)
3839                 exp_put(exp);
3840         return nfserr;
3841 }
3842
3843 static __be32
3844 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3845                      struct nfsd4_secinfo *secinfo)
3846 {
3847         struct xdr_stream *xdr = &resp->xdr;
3848
3849         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3850 }
3851
3852 static __be32
3853 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3854                      struct nfsd4_secinfo_no_name *secinfo)
3855 {
3856         struct xdr_stream *xdr = &resp->xdr;
3857
3858         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3859 }
3860
3861 /*
3862  * The SETATTR encode routine is special -- it always encodes a bitmap,
3863  * regardless of the error status.
3864  */
3865 static __be32
3866 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3867 {
3868         struct xdr_stream *xdr = &resp->xdr;
3869         __be32 *p;
3870
3871         p = xdr_reserve_space(xdr, 16);
3872         if (!p)
3873                 return nfserr_resource;
3874         if (nfserr) {
3875                 *p++ = cpu_to_be32(3);
3876                 *p++ = cpu_to_be32(0);
3877                 *p++ = cpu_to_be32(0);
3878                 *p++ = cpu_to_be32(0);
3879         }
3880         else {
3881                 *p++ = cpu_to_be32(3);
3882                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3883                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3884                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3885         }
3886         return nfserr;
3887 }
3888
3889 static __be32
3890 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3891 {
3892         struct xdr_stream *xdr = &resp->xdr;
3893         __be32 *p;
3894
3895         if (!nfserr) {
3896                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3897                 if (!p)
3898                         return nfserr_resource;
3899                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3900                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3901                                                 NFS4_VERIFIER_SIZE);
3902         }
3903         else if (nfserr == nfserr_clid_inuse) {
3904                 p = xdr_reserve_space(xdr, 8);
3905                 if (!p)
3906                         return nfserr_resource;
3907                 *p++ = cpu_to_be32(0);
3908                 *p++ = cpu_to_be32(0);
3909         }
3910         return nfserr;
3911 }
3912
3913 static __be32
3914 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3915 {
3916         struct xdr_stream *xdr = &resp->xdr;
3917         __be32 *p;
3918
3919         if (!nfserr) {
3920                 p = xdr_reserve_space(xdr, 16);
3921                 if (!p)
3922                         return nfserr_resource;
3923                 *p++ = cpu_to_be32(write->wr_bytes_written);
3924                 *p++ = cpu_to_be32(write->wr_how_written);
3925                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3926                                                         NFS4_VERIFIER_SIZE);
3927         }
3928         return nfserr;
3929 }
3930
3931 static __be32
3932 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3933                          struct nfsd4_exchange_id *exid)
3934 {
3935         struct xdr_stream *xdr = &resp->xdr;
3936         __be32 *p;
3937         char *major_id;
3938         char *server_scope;
3939         int major_id_sz;
3940         int server_scope_sz;
3941         int status = 0;
3942         uint64_t minor_id = 0;
3943
3944         if (nfserr)
3945                 return nfserr;
3946
3947         major_id = utsname()->nodename;
3948         major_id_sz = strlen(major_id);
3949         server_scope = utsname()->nodename;
3950         server_scope_sz = strlen(server_scope);
3951
3952         p = xdr_reserve_space(xdr,
3953                 8 /* eir_clientid */ +
3954                 4 /* eir_sequenceid */ +
3955                 4 /* eir_flags */ +
3956                 4 /* spr_how */);
3957         if (!p)
3958                 return nfserr_resource;
3959
3960         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3961         *p++ = cpu_to_be32(exid->seqid);
3962         *p++ = cpu_to_be32(exid->flags);
3963
3964         *p++ = cpu_to_be32(exid->spa_how);
3965
3966         switch (exid->spa_how) {
3967         case SP4_NONE:
3968                 break;
3969         case SP4_MACH_CRED:
3970                 /* spo_must_enforce bitmap: */
3971                 status = nfsd4_encode_bitmap(xdr,
3972                                         exid->spo_must_enforce[0],
3973                                         exid->spo_must_enforce[1],
3974                                         exid->spo_must_enforce[2]);
3975                 if (status)
3976                         goto out;
3977                 /* spo_must_allow bitmap: */
3978                 status = nfsd4_encode_bitmap(xdr,
3979                                         exid->spo_must_allow[0],
3980                                         exid->spo_must_allow[1],
3981                                         exid->spo_must_allow[2]);
3982                 if (status)
3983                         goto out;
3984                 break;
3985         default:
3986                 WARN_ON_ONCE(1);
3987         }
3988
3989         p = xdr_reserve_space(xdr,
3990                 8 /* so_minor_id */ +
3991                 4 /* so_major_id.len */ +
3992                 (XDR_QUADLEN(major_id_sz) * 4) +
3993                 4 /* eir_server_scope.len */ +
3994                 (XDR_QUADLEN(server_scope_sz) * 4) +
3995                 4 /* eir_server_impl_id.count (0) */);
3996         if (!p)
3997                 return nfserr_resource;
3998
3999         /* The server_owner struct */
4000         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
4001         /* major id */
4002         p = xdr_encode_opaque(p, major_id, major_id_sz);
4003
4004         /* Server scope */
4005         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4006
4007         /* Implementation id */
4008         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
4009         return 0;
4010 out:
4011         return status;
4012 }
4013
4014 static __be32
4015 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4016                             struct nfsd4_create_session *sess)
4017 {
4018         struct xdr_stream *xdr = &resp->xdr;
4019         __be32 *p;
4020
4021         if (nfserr)
4022                 return nfserr;
4023
4024         p = xdr_reserve_space(xdr, 24);
4025         if (!p)
4026                 return nfserr_resource;
4027         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4028                                         NFS4_MAX_SESSIONID_LEN);
4029         *p++ = cpu_to_be32(sess->seqid);
4030         *p++ = cpu_to_be32(sess->flags);
4031
4032         p = xdr_reserve_space(xdr, 28);
4033         if (!p)
4034                 return nfserr_resource;
4035         *p++ = cpu_to_be32(0); /* headerpadsz */
4036         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4037         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4038         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4039         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4040         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4041         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4042
4043         if (sess->fore_channel.nr_rdma_attrs) {
4044                 p = xdr_reserve_space(xdr, 4);
4045                 if (!p)
4046                         return nfserr_resource;
4047                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4048         }
4049
4050         p = xdr_reserve_space(xdr, 28);
4051         if (!p)
4052                 return nfserr_resource;
4053         *p++ = cpu_to_be32(0); /* headerpadsz */
4054         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4055         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4056         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4057         *p++ = cpu_to_be32(sess->back_channel.maxops);
4058         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4059         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4060
4061         if (sess->back_channel.nr_rdma_attrs) {
4062                 p = xdr_reserve_space(xdr, 4);
4063                 if (!p)
4064                         return nfserr_resource;
4065                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4066         }
4067         return 0;
4068 }
4069
4070 static __be32
4071 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4072                       struct nfsd4_sequence *seq)
4073 {
4074         struct xdr_stream *xdr = &resp->xdr;
4075         __be32 *p;
4076
4077         if (nfserr)
4078                 return nfserr;
4079
4080         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4081         if (!p)
4082                 return nfserr_resource;
4083         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4084                                         NFS4_MAX_SESSIONID_LEN);
4085         *p++ = cpu_to_be32(seq->seqid);
4086         *p++ = cpu_to_be32(seq->slotid);
4087         /* Note slotid's are numbered from zero: */
4088         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4089         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4090         *p++ = cpu_to_be32(seq->status_flags);
4091
4092         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4093         return 0;
4094 }
4095
4096 static __be32
4097 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4098                           struct nfsd4_test_stateid *test_stateid)
4099 {
4100         struct xdr_stream *xdr = &resp->xdr;
4101         struct nfsd4_test_stateid_id *stateid, *next;
4102         __be32 *p;
4103
4104         if (nfserr)
4105                 return nfserr;
4106
4107         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4108         if (!p)
4109                 return nfserr_resource;
4110         *p++ = htonl(test_stateid->ts_num_ids);
4111
4112         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4113                 *p++ = stateid->ts_id_status;
4114         }
4115
4116         return nfserr;
4117 }
4118
4119 #ifdef CONFIG_NFSD_PNFS
4120 static __be32
4121 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4122                 struct nfsd4_getdeviceinfo *gdev)
4123 {
4124         struct xdr_stream *xdr = &resp->xdr;
4125         const struct nfsd4_layout_ops *ops;
4126         u32 starting_len = xdr->buf->len, needed_len;
4127         __be32 *p;
4128
4129         dprintk("%s: err %d\n", __func__, be32_to_cpu(nfserr));
4130         if (nfserr)
4131                 goto out;
4132
4133         nfserr = nfserr_resource;
4134         p = xdr_reserve_space(xdr, 4);
4135         if (!p)
4136                 goto out;
4137
4138         *p++ = cpu_to_be32(gdev->gd_layout_type);
4139
4140         /* If maxcount is 0 then just update notifications */
4141         if (gdev->gd_maxcount != 0) {
4142                 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4143                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4144                 if (nfserr) {
4145                         /*
4146                          * We don't bother to burden the layout drivers with
4147                          * enforcing gd_maxcount, just tell the client to
4148                          * come back with a bigger buffer if it's not enough.
4149                          */
4150                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4151                                 goto toosmall;
4152                         goto out;
4153                 }
4154         }
4155
4156         nfserr = nfserr_resource;
4157         if (gdev->gd_notify_types) {
4158                 p = xdr_reserve_space(xdr, 4 + 4);
4159                 if (!p)
4160                         goto out;
4161                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4162                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4163         } else {
4164                 p = xdr_reserve_space(xdr, 4);
4165                 if (!p)
4166                         goto out;
4167                 *p++ = 0;
4168         }
4169
4170         nfserr = 0;
4171 out:
4172         kfree(gdev->gd_device);
4173         dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4174         return nfserr;
4175
4176 toosmall:
4177         dprintk("%s: maxcount too small\n", __func__);
4178         needed_len = xdr->buf->len + 4 /* notifications */;
4179         xdr_truncate_encode(xdr, starting_len);
4180         p = xdr_reserve_space(xdr, 4);
4181         if (!p) {
4182                 nfserr = nfserr_resource;
4183         } else {
4184                 *p++ = cpu_to_be32(needed_len);
4185                 nfserr = nfserr_toosmall;
4186         }
4187         goto out;
4188 }
4189
4190 static __be32
4191 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4192                 struct nfsd4_layoutget *lgp)
4193 {
4194         struct xdr_stream *xdr = &resp->xdr;
4195         const struct nfsd4_layout_ops *ops;
4196         __be32 *p;
4197
4198         dprintk("%s: err %d\n", __func__, nfserr);
4199         if (nfserr)
4200                 goto out;
4201
4202         nfserr = nfserr_resource;
4203         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4204         if (!p)
4205                 goto out;
4206
4207         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4208         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4209         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4210                                     sizeof(stateid_opaque_t));
4211
4212         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4213         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4214         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4215         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4216         *p++ = cpu_to_be32(lgp->lg_layout_type);
4217
4218         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4219         nfserr = ops->encode_layoutget(xdr, lgp);
4220 out:
4221         kfree(lgp->lg_content);
4222         return nfserr;
4223 }
4224
4225 static __be32
4226 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4227                           struct nfsd4_layoutcommit *lcp)
4228 {
4229         struct xdr_stream *xdr = &resp->xdr;
4230         __be32 *p;
4231
4232         if (nfserr)
4233                 return nfserr;
4234
4235         p = xdr_reserve_space(xdr, 4);
4236         if (!p)
4237                 return nfserr_resource;
4238         *p++ = cpu_to_be32(lcp->lc_size_chg);
4239         if (lcp->lc_size_chg) {
4240                 p = xdr_reserve_space(xdr, 8);
4241                 if (!p)
4242                         return nfserr_resource;
4243                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4244         }
4245
4246         return nfs_ok;
4247 }
4248
4249 static __be32
4250 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4251                 struct nfsd4_layoutreturn *lrp)
4252 {
4253         struct xdr_stream *xdr = &resp->xdr;
4254         __be32 *p;
4255
4256         if (nfserr)
4257                 return nfserr;
4258
4259         p = xdr_reserve_space(xdr, 4);
4260         if (!p)
4261                 return nfserr_resource;
4262         *p++ = cpu_to_be32(lrp->lrs_present);
4263         if (lrp->lrs_present)
4264                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4265         return nfs_ok;
4266 }
4267 #endif /* CONFIG_NFSD_PNFS */
4268
4269 static __be32
4270 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4271 {
4272         __be32 *p;
4273
4274         p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4275         if (!p)
4276                 return nfserr_resource;
4277
4278         *p++ = cpu_to_be32(0);
4279         p = xdr_encode_hyper(p, write->wr_bytes_written);
4280         *p++ = cpu_to_be32(write->wr_stable_how);
4281         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4282                                     NFS4_VERIFIER_SIZE);
4283         return nfs_ok;
4284 }
4285
4286 static __be32
4287 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4288                   struct nfsd4_copy *copy)
4289 {
4290         __be32 *p;
4291
4292         if (!nfserr) {
4293                 nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
4294                 if (nfserr)
4295                         return nfserr;
4296
4297                 p = xdr_reserve_space(&resp->xdr, 4 + 4);
4298                 *p++ = cpu_to_be32(copy->cp_consecutive);
4299                 *p++ = cpu_to_be32(copy->cp_synchronous);
4300         }
4301         return nfserr;
4302 }
4303
4304 static __be32
4305 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4306                   struct nfsd4_seek *seek)
4307 {
4308         __be32 *p;
4309
4310         if (nfserr)
4311                 return nfserr;
4312
4313         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4314         *p++ = cpu_to_be32(seek->seek_eof);
4315         p = xdr_encode_hyper(p, seek->seek_pos);
4316
4317         return nfserr;
4318 }
4319
4320 static __be32
4321 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4322 {
4323         return nfserr;
4324 }
4325
4326 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4327
4328 /*
4329  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4330  * since we don't need to filter out obsolete ops as this is
4331  * done in the decoding phase.
4332  */
4333 static nfsd4_enc nfsd4_enc_ops[] = {
4334         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4335         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4336         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4337         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4338         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4339         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4340         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4341         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4342         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4343         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4344         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4345         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4346         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4347         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4348         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4349         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4350         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4351         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4352         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4353         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4354         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4355         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4356         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4357         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4358         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4359         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4360         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4361         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4362         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4363         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4364         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4365         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4366         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4367         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4368         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4369         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4370         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4371
4372         /* NFSv4.1 operations */
4373         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4374         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4375         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4376         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4377         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4378         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4379         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4380 #ifdef CONFIG_NFSD_PNFS
4381         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4382         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4383         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4384         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4385         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4386 #else
4387         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4388         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4389         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4390         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4391         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4392 #endif
4393         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4394         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4395         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4396         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4397         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4398         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4399         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4400
4401         /* NFSv4.2 operations */
4402         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4403         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
4404         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4405         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4406         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4407         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4408         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4409         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4410         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4411         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4412         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4413         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4414         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4415 };
4416
4417 /*
4418  * Calculate whether we still have space to encode repsize bytes.
4419  * There are two considerations:
4420  *     - For NFS versions >=4.1, the size of the reply must stay within
4421  *       session limits
4422  *     - For all NFS versions, we must stay within limited preallocated
4423  *       buffer space.
4424  *
4425  * This is called before the operation is processed, so can only provide
4426  * an upper estimate.  For some nonidempotent operations (such as
4427  * getattr), it's not necessarily a problem if that estimate is wrong,
4428  * as we can fail it after processing without significant side effects.
4429  */
4430 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4431 {
4432         struct xdr_buf *buf = &resp->rqstp->rq_res;
4433         struct nfsd4_slot *slot = resp->cstate.slot;
4434
4435         if (buf->len + respsize <= buf->buflen)
4436                 return nfs_ok;
4437         if (!nfsd4_has_session(&resp->cstate))
4438                 return nfserr_resource;
4439         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4440                 WARN_ON_ONCE(1);
4441                 return nfserr_rep_too_big_to_cache;
4442         }
4443         return nfserr_rep_too_big;
4444 }
4445
4446 void
4447 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4448 {
4449         struct xdr_stream *xdr = &resp->xdr;
4450         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4451         struct svc_rqst *rqstp = resp->rqstp;
4452         int post_err_offset;
4453         nfsd4_enc encoder;
4454         __be32 *p;
4455
4456         p = xdr_reserve_space(xdr, 8);
4457         if (!p) {
4458                 WARN_ON_ONCE(1);
4459                 return;
4460         }
4461         *p++ = cpu_to_be32(op->opnum);
4462         post_err_offset = xdr->buf->len;
4463
4464         if (op->opnum == OP_ILLEGAL)
4465                 goto status;
4466         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4467                !nfsd4_enc_ops[op->opnum]);
4468         encoder = nfsd4_enc_ops[op->opnum];
4469         op->status = encoder(resp, op->status, &op->u);
4470         xdr_commit_encode(xdr);
4471
4472         /* nfsd4_check_resp_size guarantees enough room for error status */
4473         if (!op->status) {
4474                 int space_needed = 0;
4475                 if (!nfsd4_last_compound_op(rqstp))
4476                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4477                 op->status = nfsd4_check_resp_size(resp, space_needed);
4478         }
4479         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4480                 struct nfsd4_slot *slot = resp->cstate.slot;
4481
4482                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4483                         op->status = nfserr_rep_too_big_to_cache;
4484                 else
4485                         op->status = nfserr_rep_too_big;
4486         }
4487         if (op->status == nfserr_resource ||
4488             op->status == nfserr_rep_too_big ||
4489             op->status == nfserr_rep_too_big_to_cache) {
4490                 /*
4491                  * The operation may have already been encoded or
4492                  * partially encoded.  No op returns anything additional
4493                  * in the case of one of these three errors, so we can
4494                  * just truncate back to after the status.  But it's a
4495                  * bug if we had to do this on a non-idempotent op:
4496                  */
4497                 warn_on_nonidempotent_op(op);
4498                 xdr_truncate_encode(xdr, post_err_offset);
4499         }
4500         if (so) {
4501                 int len = xdr->buf->len - post_err_offset;
4502
4503                 so->so_replay.rp_status = op->status;
4504                 so->so_replay.rp_buflen = len;
4505                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4506                                                 so->so_replay.rp_buf, len);
4507         }
4508 status:
4509         /* Note that op->status is already in network byte order: */
4510         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4511 }
4512
4513 /*
4514  * Encode the reply stored in the stateowner reply cache
4515  *
4516  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4517  * previously sent already encoded operation.
4518  */
4519 void
4520 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4521 {
4522         __be32 *p;
4523         struct nfs4_replay *rp = op->replay;
4524
4525         BUG_ON(!rp);
4526
4527         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4528         if (!p) {
4529                 WARN_ON_ONCE(1);
4530                 return;
4531         }
4532         *p++ = cpu_to_be32(op->opnum);
4533         *p++ = rp->rp_status;  /* already xdr'ed */
4534
4535         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4536 }
4537
4538 int
4539 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4540 {
4541         return xdr_ressize_check(rqstp, p);
4542 }
4543
4544 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4545 {
4546         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4547
4548         if (args->ops != args->iops) {
4549                 kfree(args->ops);
4550                 args->ops = args->iops;
4551         }
4552         kfree(args->tmpp);
4553         args->tmpp = NULL;
4554         while (args->to_free) {
4555                 struct svcxdr_tmpbuf *tb = args->to_free;
4556                 args->to_free = tb->next;
4557                 kfree(tb);
4558         }
4559 }
4560
4561 int
4562 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4563 {
4564         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4565
4566         if (rqstp->rq_arg.head[0].iov_len % 4) {
4567                 /* client is nuts */
4568                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4569                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4570                 return 0;
4571         }
4572         args->p = p;
4573         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4574         args->pagelist = rqstp->rq_arg.pages;
4575         args->pagelen = rqstp->rq_arg.page_len;
4576         args->tmpp = NULL;
4577         args->to_free = NULL;
4578         args->ops = args->iops;
4579         args->rqstp = rqstp;
4580
4581         return !nfsd4_decode_compound(args);
4582 }
4583
4584 int
4585 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4586 {
4587         /*
4588          * All that remains is to write the tag and operation count...
4589          */
4590         struct nfsd4_compoundres *resp = rqstp->rq_resp;
4591         struct xdr_buf *buf = resp->xdr.buf;
4592
4593         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4594                                  buf->tail[0].iov_len);
4595
4596         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4597
4598         p = resp->tagp;
4599         *p++ = htonl(resp->taglen);
4600         memcpy(p, resp->tag, resp->taglen);
4601         p += XDR_QUADLEN(resp->taglen);
4602         *p++ = htonl(resp->opcnt);
4603
4604         nfsd4_sequence_done(resp);
4605         return 1;
4606 }
4607
4608 /*
4609  * Local variables:
4610  *  c-basic-offset: 8
4611  * End:
4612  */