fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 #include <linux/fs_struct.h>
  37 #include <linux/file.h>
  38 #include <linux/slab.h>
  39 #include <linux/namei.h>
  40 #include <linux/statfs.h>
  41 #include <linux/utsname.h>
  42 #include <linux/pagemap.h>
  43 #include <linux/sunrpc/svcauth_gss.h>
  44
  45 #include "idmap.h"
  46 #include "acl.h"
  47 #include "xdr4.h"
  48 #include "vfs.h"
  49 #include "state.h"
  50 #include "cache.h"
  51 #include "netns.h"
  52 #include "pnfs.h"
  53
  54 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  55 #include <linux/security.h>
  56 #endif
  57
  58
  59 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  60
  61 const u32 nfsd_suppattrs[3][3] = {
  62         {NFSD4_SUPPORTED_ATTRS_WORD0,
  63          NFSD4_SUPPORTED_ATTRS_WORD1,
  64          NFSD4_SUPPORTED_ATTRS_WORD2},
  65
  66         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  67          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  68          NFSD4_1_SUPPORTED_ATTRS_WORD2},
  69
  70         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  71          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  72          NFSD4_2_SUPPORTED_ATTRS_WORD2},
  73 };
  74
  75 /*
  76  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  77  * directory in order to indicate to the client that a filesystem boundary is present
  78  * We use a fixed fsid for a referral
  79  */
  80 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  81 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  82
  83 static __be32
  84 check_filename(char *str, int len)
  85 {
  86         int i;
  87
  88         if (len == 0)
  89                 return nfserr_inval;
  90         if (isdotent(str, len))
  91                 return nfserr_badname;
  92         for (i = 0; i < len; i++)
  93                 if (str[i] == '/')
  94                         return nfserr_badname;
  95         return 0;
  96 }
  97
  98 #define DECODE_HEAD                             \
  99         __be32 *p;                              \
 100         __be32 status
 101 #define DECODE_TAIL                             \
 102         status = 0;                             \
 103 out:                                            \
 104         return status;                          \
 105 xdr_error:                                      \
 106         dprintk("NFSD: xdr error (%s:%d)\n",    \
 107                         __FILE__, __LINE__);    \
 108         status = nfserr_bad_xdr;                \
 109         goto out
 110
 111 #define READMEM(x,nbytes) do {                  \
 112         x = (char *)p;                          \
 113         p += XDR_QUADLEN(nbytes);               \
 114 } while (0)
 115 #define SAVEMEM(x,nbytes) do {                  \
 116         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 117                 savemem(argp, p, nbytes) :      \
 118                 (char *)p)) {                   \
 119                 dprintk("NFSD: xdr error (%s:%d)\n", \
 120                                 __FILE__, __LINE__); \
 121                 goto xdr_error;                 \
 122                 }                               \
 123         p += XDR_QUADLEN(nbytes);               \
 124 } while (0)
 125 #define COPYMEM(x,nbytes) do {                  \
 126         memcpy((x), p, nbytes);                 \
 127         p += XDR_QUADLEN(nbytes);               \
 128 } while (0)
 129
 130 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 131 #define READ_BUF(nbytes)  do {                  \
 132         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 133                 p = argp->p;                    \
 134                 argp->p += XDR_QUADLEN(nbytes); \
 135         } else if (!(p = read_buf(argp, nbytes))) { \
 136                 dprintk("NFSD: xdr error (%s:%d)\n", \
 137                                 __FILE__, __LINE__); \
 138                 goto xdr_error;                 \
 139         }                                       \
 140 } while (0)
 141
 142 static void next_decode_page(struct nfsd4_compoundargs *argp)
 143 {
 144         argp->p = page_address(argp->pagelist[0]);
 145         argp->pagelist++;
 146         if (argp->pagelen < PAGE_SIZE) {
 147                 argp->end = argp->p + (argp->pagelen>>2);
 148                 argp->pagelen = 0;
 149         } else {
 150                 argp->end = argp->p + (PAGE_SIZE>>2);
 151                 argp->pagelen -= PAGE_SIZE;
 152         }
 153 }
 154
 155 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 156 {
 157         /* We want more bytes than seem to be available.
 158          * Maybe we need a new page, maybe we have just run out
 159          */
 160         unsigned int avail = (char *)argp->end - (char *)argp->p;
 161         __be32 *p;
 162         if (avail + argp->pagelen < nbytes)
 163                 return NULL;
 164         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 165                 return NULL;
 166         /* ok, we can do it with the current plus the next page */
 167         if (nbytes <= sizeof(argp->tmp))
 168                 p = argp->tmp;
 169         else {
 170                 kfree(argp->tmpp);
 171                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 172                 if (!p)
 173                         return NULL;
 174
 175         }
 176         /*
 177          * The following memcpy is safe because read_buf is always
 178          * called with nbytes > avail, and the two cases above both
 179          * guarantee p points to at least nbytes bytes.
 180          */
 181         memcpy(p, argp->p, avail);
 182         next_decode_page(argp);
 183         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 184         argp->p += XDR_QUADLEN(nbytes - avail);
 185         return p;
 186 }
 187
 188 static int zero_clientid(clientid_t *clid)
 189 {
 190         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 191 }
 192
 193 /**
 194  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 195  * @argp: NFSv4 compound argument structure
 196  * @p: pointer to be freed (with kfree())
 197  *
 198  * Marks @p to be freed when processing the compound operation
 199  * described in @argp finishes.
 200  */
 201 static void *
 202 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 203 {
 204         struct svcxdr_tmpbuf *tb;
 205
 206         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 207         if (!tb)
 208                 return NULL;
 209         tb->next = argp->to_free;
 210         argp->to_free = tb;
 211         return tb->buf;
 212 }
 213
 214 /*
 215  * For xdr strings that need to be passed to other kernel api's
 216  * as null-terminated strings.
 217  *
 218  * Note null-terminating in place usually isn't safe since the
 219  * buffer might end on a page boundary.
 220  */
 221 static char *
 222 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 223 {
 224         char *p = svcxdr_tmpalloc(argp, len + 1);
 225
 226         if (!p)
 227                 return NULL;
 228         memcpy(p, buf, len);
 229         p[len] = '\0';
 230         return p;
 231 }
 232
 233 /**
 234  * savemem - duplicate a chunk of memory for later processing
 235  * @argp: NFSv4 compound argument structure to be freed with
 236  * @p: pointer to be duplicated
 237  * @nbytes: length to be duplicated
 238  *
 239  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 240  * that are preserved until processing of the NFSv4 compound
 241  * operation described by @argp finishes.
 242  */
 243 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 244 {
 245         void *ret;
 246
 247         ret = svcxdr_tmpalloc(argp, nbytes);
 248         if (!ret)
 249                 return NULL;
 250         memcpy(ret, p, nbytes);
 251         return ret;
 252 }
 253
 254 /*
 255  * We require the high 32 bits of 'seconds' to be 0, and
 256  * we ignore all 32 bits of 'nseconds'.
 257  */
 258 static __be32
 259 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
 260 {
 261         DECODE_HEAD;
 262         u64 sec;
 263
 264         READ_BUF(12);
 265         p = xdr_decode_hyper(p, &sec);
 266         tv->tv_sec = sec;
 267         tv->tv_nsec = be32_to_cpup(p++);
 268         if (tv->tv_nsec >= (u32)1000000000)
 269                 return nfserr_inval;
 270
 271         DECODE_TAIL;
 272 }
 273
 274 static __be32
 275 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 276 {
 277         u32 bmlen;
 278         DECODE_HEAD;
 279
 280         bmval[0] = 0;
 281         bmval[1] = 0;
 282         bmval[2] = 0;
 283
 284         READ_BUF(4);
 285         bmlen = be32_to_cpup(p++);
 286         if (bmlen > 1000)
 287                 goto xdr_error;
 288
 289         READ_BUF(bmlen << 2);
 290         if (bmlen > 0)
 291                 bmval[0] = be32_to_cpup(p++);
 292         if (bmlen > 1)
 293                 bmval[1] = be32_to_cpup(p++);
 294         if (bmlen > 2)
 295                 bmval[2] = be32_to_cpup(p++);
 296
 297         DECODE_TAIL;
 298 }
 299
 300 static __be32
 301 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 302                    struct iattr *iattr, struct nfs4_acl **acl,
 303                    struct xdr_netobj *label, int *umask)
 304 {
 305         int expected_len, len = 0;
 306         u32 dummy32;
 307         char *buf;
 308
 309         DECODE_HEAD;
 310         iattr->ia_valid = 0;
 311         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 312                 return status;
 313
 314         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 315             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 316             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
 317                 if (nfsd_attrs_supported(argp->minorversion, bmval))
 318                         return nfserr_inval;
 319                 return nfserr_attrnotsupp;
 320         }
 321
 322         READ_BUF(4);
 323         expected_len = be32_to_cpup(p++);
 324
 325         if (bmval[0] & FATTR4_WORD0_SIZE) {
 326                 READ_BUF(8);
 327                 len += 8;
 328                 p = xdr_decode_hyper(p, &iattr->ia_size);
 329                 iattr->ia_valid |= ATTR_SIZE;
 330         }
 331         if (bmval[0] & FATTR4_WORD0_ACL) {
 332                 u32 nace;
 333                 struct nfs4_ace *ace;
 334
 335                 READ_BUF(4); len += 4;
 336                 nace = be32_to_cpup(p++);
 337
 338                 if (nace > NFS4_ACL_MAX)
 339                         return nfserr_fbig;
 340
 341                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
 342                 if (*acl == NULL)
 343                         return nfserr_jukebox;
 344
 345                 (*acl)->naces = nace;
 346                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 347                         READ_BUF(16); len += 16;
 348                         ace->type = be32_to_cpup(p++);
 349                         ace->flag = be32_to_cpup(p++);
 350                         ace->access_mask = be32_to_cpup(p++);
 351                         dummy32 = be32_to_cpup(p++);
 352                         READ_BUF(dummy32);
 353                         len += XDR_QUADLEN(dummy32) << 2;
 354                         READMEM(buf, dummy32);
 355                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 356                         status = nfs_ok;
 357                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 358                                 ;
 359                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 360                                 status = nfsd_map_name_to_gid(argp->rqstp,
 361                                                 buf, dummy32, &ace->who_gid);
 362                         else
 363                                 status = nfsd_map_name_to_uid(argp->rqstp,
 364                                                 buf, dummy32, &ace->who_uid);
 365                         if (status)
 366                                 return status;
 367                 }
 368         } else
 369                 *acl = NULL;
 370         if (bmval[1] & FATTR4_WORD1_MODE) {
 371                 READ_BUF(4);
 372                 len += 4;
 373                 iattr->ia_mode = be32_to_cpup(p++);
 374                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 375                 iattr->ia_valid |= ATTR_MODE;
 376         }
 377         if (bmval[1] & FATTR4_WORD1_OWNER) {
 378                 READ_BUF(4);
 379                 len += 4;
 380                 dummy32 = be32_to_cpup(p++);
 381                 READ_BUF(dummy32);
 382                 len += (XDR_QUADLEN(dummy32) << 2);
 383                 READMEM(buf, dummy32);
 384                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 385                         return status;
 386                 iattr->ia_valid |= ATTR_UID;
 387         }
 388         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 389                 READ_BUF(4);
 390                 len += 4;
 391                 dummy32 = be32_to_cpup(p++);
 392                 READ_BUF(dummy32);
 393                 len += (XDR_QUADLEN(dummy32) << 2);
 394                 READMEM(buf, dummy32);
 395                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 396                         return status;
 397                 iattr->ia_valid |= ATTR_GID;
 398         }
 399         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 400                 READ_BUF(4);
 401                 len += 4;
 402                 dummy32 = be32_to_cpup(p++);
 403                 switch (dummy32) {
 404                 case NFS4_SET_TO_CLIENT_TIME:
 405                         len += 12;
 406                         status = nfsd4_decode_time(argp, &iattr->ia_atime);
 407                         if (status)
 408                                 return status;
 409                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 410                         break;
 411                 case NFS4_SET_TO_SERVER_TIME:
 412                         iattr->ia_valid |= ATTR_ATIME;
 413                         break;
 414                 default:
 415                         goto xdr_error;
 416                 }
 417         }
 418         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 419                 READ_BUF(4);
 420                 len += 4;
 421                 dummy32 = be32_to_cpup(p++);
 422                 switch (dummy32) {
 423                 case NFS4_SET_TO_CLIENT_TIME:
 424                         len += 12;
 425                         status = nfsd4_decode_time(argp, &iattr->ia_mtime);
 426                         if (status)
 427                                 return status;
 428                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 429                         break;
 430                 case NFS4_SET_TO_SERVER_TIME:
 431                         iattr->ia_valid |= ATTR_MTIME;
 432                         break;
 433                 default:
 434                         goto xdr_error;
 435                 }
 436         }
 437
 438         label->len = 0;
 439 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 440         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 441                 READ_BUF(4);
 442                 len += 4;
 443                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 444                 READ_BUF(4);
 445                 len += 4;
 446                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 447                 READ_BUF(4);
 448                 len += 4;
 449                 dummy32 = be32_to_cpup(p++);
 450                 READ_BUF(dummy32);
 451                 if (dummy32 > NFS4_MAXLABELLEN)
 452                         return nfserr_badlabel;
 453                 len += (XDR_QUADLEN(dummy32) << 2);
 454                 READMEM(buf, dummy32);
 455                 label->len = dummy32;
 456                 label->data = svcxdr_dupstr(argp, buf, dummy32);
 457                 if (!label->data)
 458                         return nfserr_jukebox;
 459         }
 460 #endif
 461         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
 462                 if (!umask)
 463                         goto xdr_error;
 464                 READ_BUF(8);
 465                 len += 8;
 466                 dummy32 = be32_to_cpup(p++);
 467                 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
 468                 dummy32 = be32_to_cpup(p++);
 469                 *umask = dummy32 & S_IRWXUGO;
 470                 iattr->ia_valid |= ATTR_MODE;
 471         }
 472         if (len != expected_len)
 473                 goto xdr_error;
 474
 475         DECODE_TAIL;
 476 }
 477
 478 static __be32
 479 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 480 {
 481         DECODE_HEAD;
 482
 483         READ_BUF(sizeof(stateid_t));
 484         sid->si_generation = be32_to_cpup(p++);
 485         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 486
 487         DECODE_TAIL;
 488 }
 489
 490 static __be32
 491 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 492 {
 493         DECODE_HEAD;
 494
 495         READ_BUF(4);
 496         access->ac_req_access = be32_to_cpup(p++);
 497
 498         DECODE_TAIL;
 499 }
 500
 501 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 502 {
 503         DECODE_HEAD;
 504         u32 dummy, uid, gid;
 505         char *machine_name;
 506         int i;
 507         int nr_secflavs;
 508
 509         /* callback_sec_params4 */
 510         READ_BUF(4);
 511         nr_secflavs = be32_to_cpup(p++);
 512         if (nr_secflavs)
 513                 cbs->flavor = (u32)(-1);
 514         else
 515                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 516                 cbs->flavor = 0;
 517         for (i = 0; i < nr_secflavs; ++i) {
 518                 READ_BUF(4);
 519                 dummy = be32_to_cpup(p++);
 520                 switch (dummy) {
 521                 case RPC_AUTH_NULL:
 522                         /* Nothing to read */
 523                         if (cbs->flavor == (u32)(-1))
 524                                 cbs->flavor = RPC_AUTH_NULL;
 525                         break;
 526                 case RPC_AUTH_UNIX:
 527                         READ_BUF(8);
 528                         /* stamp */
 529                         dummy = be32_to_cpup(p++);
 530
 531                         /* machine name */
 532                         dummy = be32_to_cpup(p++);
 533                         READ_BUF(dummy);
 534                         SAVEMEM(machine_name, dummy);
 535
 536                         /* uid, gid */
 537                         READ_BUF(8);
 538                         uid = be32_to_cpup(p++);
 539                         gid = be32_to_cpup(p++);
 540
 541                         /* more gids */
 542                         READ_BUF(4);
 543                         dummy = be32_to_cpup(p++);
 544                         READ_BUF(dummy * 4);
 545                         if (cbs->flavor == (u32)(-1)) {
 546                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 547                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 548                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 549                                         cbs->uid = kuid;
 550                                         cbs->gid = kgid;
 551                                         cbs->flavor = RPC_AUTH_UNIX;
 552                                 } else {
 553                                         dprintk("RPC_AUTH_UNIX with invalid"
 554                                                 "uid or gid ignoring!\n");
 555                                 }
 556                         }
 557                         break;
 558                 case RPC_AUTH_GSS:
 559                         dprintk("RPC_AUTH_GSS callback secflavor "
 560                                 "not supported!\n");
 561                         READ_BUF(8);
 562                         /* gcbp_service */
 563                         dummy = be32_to_cpup(p++);
 564                         /* gcbp_handle_from_server */
 565                         dummy = be32_to_cpup(p++);
 566                         READ_BUF(dummy);
 567                         p += XDR_QUADLEN(dummy);
 568                         /* gcbp_handle_from_client */
 569                         READ_BUF(4);
 570                         dummy = be32_to_cpup(p++);
 571                         READ_BUF(dummy);
 572                         break;
 573                 default:
 574                         dprintk("Illegal callback secflavor\n");
 575                         return nfserr_inval;
 576                 }
 577         }
 578         DECODE_TAIL;
 579 }
 580
 581 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 582 {
 583         DECODE_HEAD;
 584
 585         READ_BUF(4);
 586         bc->bc_cb_program = be32_to_cpup(p++);
 587         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 588
 589         DECODE_TAIL;
 590 }
 591
 592 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 593 {
 594         DECODE_HEAD;
 595
 596         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 597         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 598         bcts->dir = be32_to_cpup(p++);
 599         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 600          * could help us figure out we should be using it. */
 601         DECODE_TAIL;
 602 }
 603
 604 static __be32
 605 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 606 {
 607         DECODE_HEAD;
 608
 609         READ_BUF(4);
 610         close->cl_seqid = be32_to_cpup(p++);
 611         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 612
 613         DECODE_TAIL;
 614 }
 615
 616
 617 static __be32
 618 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 619 {
 620         DECODE_HEAD;
 621
 622         READ_BUF(12);
 623         p = xdr_decode_hyper(p, &commit->co_offset);
 624         commit->co_count = be32_to_cpup(p++);
 625
 626         DECODE_TAIL;
 627 }
 628
 629 static __be32
 630 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 631 {
 632         DECODE_HEAD;
 633
 634         READ_BUF(4);
 635         create->cr_type = be32_to_cpup(p++);
 636         switch (create->cr_type) {
 637         case NF4LNK:
 638                 READ_BUF(4);
 639                 create->cr_datalen = be32_to_cpup(p++);
 640                 READ_BUF(create->cr_datalen);
 641                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 642                 if (!create->cr_data)
 643                         return nfserr_jukebox;
 644                 break;
 645         case NF4BLK:
 646         case NF4CHR:
 647                 READ_BUF(8);
 648                 create->cr_specdata1 = be32_to_cpup(p++);
 649                 create->cr_specdata2 = be32_to_cpup(p++);
 650                 break;
 651         case NF4SOCK:
 652         case NF4FIFO:
 653         case NF4DIR:
 654         default:
 655                 break;
 656         }
 657
 658         READ_BUF(4);
 659         create->cr_namelen = be32_to_cpup(p++);
 660         READ_BUF(create->cr_namelen);
 661         SAVEMEM(create->cr_name, create->cr_namelen);
 662         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 663                 return status;
 664
 665         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 666                                     &create->cr_acl, &create->cr_label,
 667                                     &current->fs->umask);
 668         if (status)
 669                 goto out;
 670
 671         DECODE_TAIL;
 672 }
 673
 674 static inline __be32
 675 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 676 {
 677         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 678 }
 679
 680 static inline __be32
 681 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 682 {
 683         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 684 }
 685
 686 static __be32
 687 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 688 {
 689         DECODE_HEAD;
 690
 691         READ_BUF(4);
 692         link->li_namelen = be32_to_cpup(p++);
 693         READ_BUF(link->li_namelen);
 694         SAVEMEM(link->li_name, link->li_namelen);
 695         if ((status = check_filename(link->li_name, link->li_namelen)))
 696                 return status;
 697
 698         DECODE_TAIL;
 699 }
 700
 701 static __be32
 702 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 703 {
 704         DECODE_HEAD;
 705
 706         /*
 707         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 708         */
 709         READ_BUF(28);
 710         lock->lk_type = be32_to_cpup(p++);
 711         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 712                 goto xdr_error;
 713         lock->lk_reclaim = be32_to_cpup(p++);
 714         p = xdr_decode_hyper(p, &lock->lk_offset);
 715         p = xdr_decode_hyper(p, &lock->lk_length);
 716         lock->lk_is_new = be32_to_cpup(p++);
 717
 718         if (lock->lk_is_new) {
 719                 READ_BUF(4);
 720                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 721                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 722                 if (status)
 723                         return status;
 724                 READ_BUF(8 + sizeof(clientid_t));
 725                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 726                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 727                 lock->lk_new_owner.len = be32_to_cpup(p++);
 728                 READ_BUF(lock->lk_new_owner.len);
 729                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 730         } else {
 731                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 732                 if (status)
 733                         return status;
 734                 READ_BUF(4);
 735                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 736         }
 737
 738         DECODE_TAIL;
 739 }
 740
 741 static __be32
 742 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 743 {
 744         DECODE_HEAD;
 745
 746         READ_BUF(32);
 747         lockt->lt_type = be32_to_cpup(p++);
 748         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 749                 goto xdr_error;
 750         p = xdr_decode_hyper(p, &lockt->lt_offset);
 751         p = xdr_decode_hyper(p, &lockt->lt_length);
 752         COPYMEM(&lockt->lt_clientid, 8);
 753         lockt->lt_owner.len = be32_to_cpup(p++);
 754         READ_BUF(lockt->lt_owner.len);
 755         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 756
 757         DECODE_TAIL;
 758 }
 759
 760 static __be32
 761 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 762 {
 763         DECODE_HEAD;
 764
 765         READ_BUF(8);
 766         locku->lu_type = be32_to_cpup(p++);
 767         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 768                 goto xdr_error;
 769         locku->lu_seqid = be32_to_cpup(p++);
 770         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 771         if (status)
 772                 return status;
 773         READ_BUF(16);
 774         p = xdr_decode_hyper(p, &locku->lu_offset);
 775         p = xdr_decode_hyper(p, &locku->lu_length);
 776
 777         DECODE_TAIL;
 778 }
 779
 780 static __be32
 781 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 782 {
 783         DECODE_HEAD;
 784
 785         READ_BUF(4);
 786         lookup->lo_len = be32_to_cpup(p++);
 787         READ_BUF(lookup->lo_len);
 788         SAVEMEM(lookup->lo_name, lookup->lo_len);
 789         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 790                 return status;
 791
 792         DECODE_TAIL;
 793 }
 794
 795 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 796 {
 797         __be32 *p;
 798         u32 w;
 799
 800         READ_BUF(4);
 801         w = be32_to_cpup(p++);
 802         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 803         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 804         if (deleg_when)
 805                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 806
 807         switch (w & NFS4_SHARE_ACCESS_MASK) {
 808         case NFS4_SHARE_ACCESS_READ:
 809         case NFS4_SHARE_ACCESS_WRITE:
 810         case NFS4_SHARE_ACCESS_BOTH:
 811                 break;
 812         default:
 813                 return nfserr_bad_xdr;
 814         }
 815         w &= ~NFS4_SHARE_ACCESS_MASK;
 816         if (!w)
 817                 return nfs_ok;
 818         if (!argp->minorversion)
 819                 return nfserr_bad_xdr;
 820         switch (w & NFS4_SHARE_WANT_MASK) {
 821         case NFS4_SHARE_WANT_NO_PREFERENCE:
 822         case NFS4_SHARE_WANT_READ_DELEG:
 823         case NFS4_SHARE_WANT_WRITE_DELEG:
 824         case NFS4_SHARE_WANT_ANY_DELEG:
 825         case NFS4_SHARE_WANT_NO_DELEG:
 826         case NFS4_SHARE_WANT_CANCEL:
 827                 break;
 828         default:
 829                 return nfserr_bad_xdr;
 830         }
 831         w &= ~NFS4_SHARE_WANT_MASK;
 832         if (!w)
 833                 return nfs_ok;
 834
 835         if (!deleg_when)        /* open_downgrade */
 836                 return nfserr_inval;
 837         switch (w) {
 838         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 839         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 840         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 841               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 842                 return nfs_ok;
 843         }
 844 xdr_error:
 845         return nfserr_bad_xdr;
 846 }
 847
 848 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 849 {
 850         __be32 *p;
 851
 852         READ_BUF(4);
 853         *x = be32_to_cpup(p++);
 854         /* Note: unlinke access bits, deny bits may be zero. */
 855         if (*x & ~NFS4_SHARE_DENY_BOTH)
 856                 return nfserr_bad_xdr;
 857         return nfs_ok;
 858 xdr_error:
 859         return nfserr_bad_xdr;
 860 }
 861
 862 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 863 {
 864         __be32 *p;
 865
 866         READ_BUF(4);
 867         o->len = be32_to_cpup(p++);
 868
 869         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 870                 return nfserr_bad_xdr;
 871
 872         READ_BUF(o->len);
 873         SAVEMEM(o->data, o->len);
 874         return nfs_ok;
 875 xdr_error:
 876         return nfserr_bad_xdr;
 877 }
 878
 879 static __be32
 880 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 881 {
 882         DECODE_HEAD;
 883         u32 dummy;
 884
 885         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 886         open->op_iattr.ia_valid = 0;
 887         open->op_openowner = NULL;
 888
 889         open->op_xdr_error = 0;
 890         /* seqid, share_access, share_deny, clientid, ownerlen */
 891         READ_BUF(4);
 892         open->op_seqid = be32_to_cpup(p++);
 893         /* decode, yet ignore deleg_when until supported */
 894         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 895                                            &open->op_deleg_want, &dummy);
 896         if (status)
 897                 goto xdr_error;
 898         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 899         if (status)
 900                 goto xdr_error;
 901         READ_BUF(sizeof(clientid_t));
 902         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 903         status = nfsd4_decode_opaque(argp, &open->op_owner);
 904         if (status)
 905                 goto xdr_error;
 906         READ_BUF(4);
 907         open->op_create = be32_to_cpup(p++);
 908         switch (open->op_create) {
 909         case NFS4_OPEN_NOCREATE:
 910                 break;
 911         case NFS4_OPEN_CREATE:
 912                 current->fs->umask = 0;
 913                 READ_BUF(4);
 914                 open->op_createmode = be32_to_cpup(p++);
 915                 switch (open->op_createmode) {
 916                 case NFS4_CREATE_UNCHECKED:
 917                 case NFS4_CREATE_GUARDED:
 918                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 919                                 &open->op_iattr, &open->op_acl, &open->op_label,
 920                                 &current->fs->umask);
 921                         if (status)
 922                                 goto out;
 923                         break;
 924                 case NFS4_CREATE_EXCLUSIVE:
 925                         READ_BUF(NFS4_VERIFIER_SIZE);
 926                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 927                         break;
 928                 case NFS4_CREATE_EXCLUSIVE4_1:
 929                         if (argp->minorversion < 1)
 930                                 goto xdr_error;
 931                         READ_BUF(NFS4_VERIFIER_SIZE);
 932                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 933                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 934                                 &open->op_iattr, &open->op_acl, &open->op_label,
 935                                 &current->fs->umask);
 936                         if (status)
 937                                 goto out;
 938                         break;
 939                 default:
 940                         goto xdr_error;
 941                 }
 942                 break;
 943         default:
 944                 goto xdr_error;
 945         }
 946
 947         /* open_claim */
 948         READ_BUF(4);
 949         open->op_claim_type = be32_to_cpup(p++);
 950         switch (open->op_claim_type) {
 951         case NFS4_OPEN_CLAIM_NULL:
 952         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 953                 READ_BUF(4);
 954                 open->op_fname.len = be32_to_cpup(p++);
 955                 READ_BUF(open->op_fname.len);
 956                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 957                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 958                         return status;
 959                 break;
 960         case NFS4_OPEN_CLAIM_PREVIOUS:
 961                 READ_BUF(4);
 962                 open->op_delegate_type = be32_to_cpup(p++);
 963                 break;
 964         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 965                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 966                 if (status)
 967                         return status;
 968                 READ_BUF(4);
 969                 open->op_fname.len = be32_to_cpup(p++);
 970                 READ_BUF(open->op_fname.len);
 971                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 972                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 973                         return status;
 974                 break;
 975         case NFS4_OPEN_CLAIM_FH:
 976         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 977                 if (argp->minorversion < 1)
 978                         goto xdr_error;
 979                 /* void */
 980                 break;
 981         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 982                 if (argp->minorversion < 1)
 983                         goto xdr_error;
 984                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 985                 if (status)
 986                         return status;
 987                 break;
 988         default:
 989                 goto xdr_error;
 990         }
 991
 992         DECODE_TAIL;
 993 }
 994
 995 static __be32
 996 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 997 {
 998         DECODE_HEAD;
 999
1000         if (argp->minorversion >= 1)
1001                 return nfserr_notsupp;
1002
1003         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1004         if (status)
1005                 return status;
1006         READ_BUF(4);
1007         open_conf->oc_seqid = be32_to_cpup(p++);
1008
1009         DECODE_TAIL;
1010 }
1011
1012 static __be32
1013 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1014 {
1015         DECODE_HEAD;
1016
1017         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1018         if (status)
1019                 return status;
1020         READ_BUF(4);
1021         open_down->od_seqid = be32_to_cpup(p++);
1022         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1023                                            &open_down->od_deleg_want, NULL);
1024         if (status)
1025                 return status;
1026         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1027         if (status)
1028                 return status;
1029         DECODE_TAIL;
1030 }
1031
1032 static __be32
1033 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1034 {
1035         DECODE_HEAD;
1036
1037         READ_BUF(4);
1038         putfh->pf_fhlen = be32_to_cpup(p++);
1039         if (putfh->pf_fhlen > NFS4_FHSIZE)
1040                 goto xdr_error;
1041         READ_BUF(putfh->pf_fhlen);
1042         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1043
1044         DECODE_TAIL;
1045 }
1046
1047 static __be32
1048 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1049 {
1050         if (argp->minorversion == 0)
1051                 return nfs_ok;
1052         return nfserr_notsupp;
1053 }
1054
1055 static __be32
1056 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1057 {
1058         DECODE_HEAD;
1059
1060         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1061         if (status)
1062                 return status;
1063         READ_BUF(12);
1064         p = xdr_decode_hyper(p, &read->rd_offset);
1065         read->rd_length = be32_to_cpup(p++);
1066
1067         DECODE_TAIL;
1068 }
1069
1070 static __be32
1071 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1072 {
1073         DECODE_HEAD;
1074
1075         READ_BUF(24);
1076         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1077         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1078         readdir->rd_dircount = be32_to_cpup(p++);
1079         readdir->rd_maxcount = be32_to_cpup(p++);
1080         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1081                 goto out;
1082
1083         DECODE_TAIL;
1084 }
1085
1086 static __be32
1087 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1088 {
1089         DECODE_HEAD;
1090
1091         READ_BUF(4);
1092         remove->rm_namelen = be32_to_cpup(p++);
1093         READ_BUF(remove->rm_namelen);
1094         SAVEMEM(remove->rm_name, remove->rm_namelen);
1095         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1096                 return status;
1097
1098         DECODE_TAIL;
1099 }
1100
1101 static __be32
1102 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1103 {
1104         DECODE_HEAD;
1105
1106         READ_BUF(4);
1107         rename->rn_snamelen = be32_to_cpup(p++);
1108         READ_BUF(rename->rn_snamelen);
1109         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1110         READ_BUF(4);
1111         rename->rn_tnamelen = be32_to_cpup(p++);
1112         READ_BUF(rename->rn_tnamelen);
1113         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1114         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1115                 return status;
1116         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1117                 return status;
1118
1119         DECODE_TAIL;
1120 }
1121
1122 static __be32
1123 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1124 {
1125         DECODE_HEAD;
1126
1127         if (argp->minorversion >= 1)
1128                 return nfserr_notsupp;
1129
1130         READ_BUF(sizeof(clientid_t));
1131         COPYMEM(clientid, sizeof(clientid_t));
1132
1133         DECODE_TAIL;
1134 }
1135
1136 static __be32
1137 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1138                      struct nfsd4_secinfo *secinfo)
1139 {
1140         DECODE_HEAD;
1141
1142         READ_BUF(4);
1143         secinfo->si_namelen = be32_to_cpup(p++);
1144         READ_BUF(secinfo->si_namelen);
1145         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1146         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1147         if (status)
1148                 return status;
1149         DECODE_TAIL;
1150 }
1151
1152 static __be32
1153 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1154                      struct nfsd4_secinfo_no_name *sin)
1155 {
1156         DECODE_HEAD;
1157
1158         READ_BUF(4);
1159         sin->sin_style = be32_to_cpup(p++);
1160         DECODE_TAIL;
1161 }
1162
1163 static __be32
1164 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1165 {
1166         __be32 status;
1167
1168         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1169         if (status)
1170                 return status;
1171         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1172                                   &setattr->sa_acl, &setattr->sa_label, NULL);
1173 }
1174
1175 static __be32
1176 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1177 {
1178         DECODE_HEAD;
1179
1180         if (argp->minorversion >= 1)
1181                 return nfserr_notsupp;
1182
1183         READ_BUF(NFS4_VERIFIER_SIZE);
1184         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1185
1186         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1187         if (status)
1188                 return nfserr_bad_xdr;
1189         READ_BUF(8);
1190         setclientid->se_callback_prog = be32_to_cpup(p++);
1191         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1192         READ_BUF(setclientid->se_callback_netid_len);
1193         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1194         READ_BUF(4);
1195         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1196
1197         READ_BUF(setclientid->se_callback_addr_len);
1198         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1199         READ_BUF(4);
1200         setclientid->se_callback_ident = be32_to_cpup(p++);
1201
1202         DECODE_TAIL;
1203 }
1204
1205 static __be32
1206 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1207 {
1208         DECODE_HEAD;
1209
1210         if (argp->minorversion >= 1)
1211                 return nfserr_notsupp;
1212
1213         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1214         COPYMEM(&scd_c->sc_clientid, 8);
1215         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1216
1217         DECODE_TAIL;
1218 }
1219
1220 /* Also used for NVERIFY */
1221 static __be32
1222 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1223 {
1224         DECODE_HEAD;
1225
1226         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1227                 goto out;
1228
1229         /* For convenience's sake, we compare raw xdr'd attributes in
1230          * nfsd4_proc_verify */
1231
1232         READ_BUF(4);
1233         verify->ve_attrlen = be32_to_cpup(p++);
1234         READ_BUF(verify->ve_attrlen);
1235         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1236
1237         DECODE_TAIL;
1238 }
1239
1240 static __be32
1241 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1242 {
1243         int avail;
1244         int len;
1245         DECODE_HEAD;
1246
1247         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1248         if (status)
1249                 return status;
1250         READ_BUF(16);
1251         p = xdr_decode_hyper(p, &write->wr_offset);
1252         write->wr_stable_how = be32_to_cpup(p++);
1253         if (write->wr_stable_how > NFS_FILE_SYNC)
1254                 goto xdr_error;
1255         write->wr_buflen = be32_to_cpup(p++);
1256
1257         /* Sorry .. no magic macros for this.. *
1258          * READ_BUF(write->wr_buflen);
1259          * SAVEMEM(write->wr_buf, write->wr_buflen);
1260          */
1261         avail = (char*)argp->end - (char*)argp->p;
1262         if (avail + argp->pagelen < write->wr_buflen) {
1263                 dprintk("NFSD: xdr error (%s:%d)\n",
1264                                 __FILE__, __LINE__);
1265                 goto xdr_error;
1266         }
1267         write->wr_head.iov_base = p;
1268         write->wr_head.iov_len = avail;
1269         write->wr_pagelist = argp->pagelist;
1270
1271         len = XDR_QUADLEN(write->wr_buflen) << 2;
1272         if (len >= avail) {
1273                 int pages;
1274
1275                 len -= avail;
1276
1277                 pages = len >> PAGE_SHIFT;
1278                 argp->pagelist += pages;
1279                 argp->pagelen -= pages * PAGE_SIZE;
1280                 len -= pages * PAGE_SIZE;
1281
1282                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1283                 argp->pagelist++;
1284                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1285         }
1286         argp->p += XDR_QUADLEN(len);
1287
1288         DECODE_TAIL;
1289 }
1290
1291 static __be32
1292 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1293 {
1294         DECODE_HEAD;
1295
1296         if (argp->minorversion >= 1)
1297                 return nfserr_notsupp;
1298
1299         READ_BUF(12);
1300         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1301         rlockowner->rl_owner.len = be32_to_cpup(p++);
1302         READ_BUF(rlockowner->rl_owner.len);
1303         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1304
1305         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1306                 return nfserr_inval;
1307         DECODE_TAIL;
1308 }
1309
1310 static __be32
1311 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1312                          struct nfsd4_exchange_id *exid)
1313 {
1314         int dummy, tmp;
1315         DECODE_HEAD;
1316
1317         READ_BUF(NFS4_VERIFIER_SIZE);
1318         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1319
1320         status = nfsd4_decode_opaque(argp, &exid->clname);
1321         if (status)
1322                 return nfserr_bad_xdr;
1323
1324         READ_BUF(4);
1325         exid->flags = be32_to_cpup(p++);
1326
1327         /* Ignore state_protect4_a */
1328         READ_BUF(4);
1329         exid->spa_how = be32_to_cpup(p++);
1330         switch (exid->spa_how) {
1331         case SP4_NONE:
1332                 break;
1333         case SP4_MACH_CRED:
1334                 /* spo_must_enforce */
1335                 status = nfsd4_decode_bitmap(argp,
1336                                         exid->spo_must_enforce);
1337                 if (status)
1338                         goto out;
1339                 /* spo_must_allow */
1340                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1341                 if (status)
1342                         goto out;
1343                 break;
1344         case SP4_SSV:
1345                 /* ssp_ops */
1346                 READ_BUF(4);
1347                 dummy = be32_to_cpup(p++);
1348                 READ_BUF(dummy * 4);
1349                 p += dummy;
1350
1351                 READ_BUF(4);
1352                 dummy = be32_to_cpup(p++);
1353                 READ_BUF(dummy * 4);
1354                 p += dummy;
1355
1356                 /* ssp_hash_algs<> */
1357                 READ_BUF(4);
1358                 tmp = be32_to_cpup(p++);
1359                 while (tmp--) {
1360                         READ_BUF(4);
1361                         dummy = be32_to_cpup(p++);
1362                         READ_BUF(dummy);
1363                         p += XDR_QUADLEN(dummy);
1364                 }
1365
1366                 /* ssp_encr_algs<> */
1367                 READ_BUF(4);
1368                 tmp = be32_to_cpup(p++);
1369                 while (tmp--) {
1370                         READ_BUF(4);
1371                         dummy = be32_to_cpup(p++);
1372                         READ_BUF(dummy);
1373                         p += XDR_QUADLEN(dummy);
1374                 }
1375
1376                 /* ssp_window and ssp_num_gss_handles */
1377                 READ_BUF(8);
1378                 dummy = be32_to_cpup(p++);
1379                 dummy = be32_to_cpup(p++);
1380                 break;
1381         default:
1382                 goto xdr_error;
1383         }
1384
1385         /* Ignore Implementation ID */
1386         READ_BUF(4);    /* nfs_impl_id4 array length */
1387         dummy = be32_to_cpup(p++);
1388
1389         if (dummy > 1)
1390                 goto xdr_error;
1391
1392         if (dummy == 1) {
1393                 /* nii_domain */
1394                 READ_BUF(4);
1395                 dummy = be32_to_cpup(p++);
1396                 READ_BUF(dummy);
1397                 p += XDR_QUADLEN(dummy);
1398
1399                 /* nii_name */
1400                 READ_BUF(4);
1401                 dummy = be32_to_cpup(p++);
1402                 READ_BUF(dummy);
1403                 p += XDR_QUADLEN(dummy);
1404
1405                 /* nii_date */
1406                 READ_BUF(12);
1407                 p += 3;
1408         }
1409         DECODE_TAIL;
1410 }
1411
1412 static __be32
1413 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1414                             struct nfsd4_create_session *sess)
1415 {
1416         DECODE_HEAD;
1417         u32 dummy;
1418
1419         READ_BUF(16);
1420         COPYMEM(&sess->clientid, 8);
1421         sess->seqid = be32_to_cpup(p++);
1422         sess->flags = be32_to_cpup(p++);
1423
1424         /* Fore channel attrs */
1425         READ_BUF(28);
1426         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1427         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1428         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1429         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1430         sess->fore_channel.maxops = be32_to_cpup(p++);
1431         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1432         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1433         if (sess->fore_channel.nr_rdma_attrs == 1) {
1434                 READ_BUF(4);
1435                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1436         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1437                 dprintk("Too many fore channel attr bitmaps!\n");
1438                 goto xdr_error;
1439         }
1440
1441         /* Back channel attrs */
1442         READ_BUF(28);
1443         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1444         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1445         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1446         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1447         sess->back_channel.maxops = be32_to_cpup(p++);
1448         sess->back_channel.maxreqs = be32_to_cpup(p++);
1449         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1450         if (sess->back_channel.nr_rdma_attrs == 1) {
1451                 READ_BUF(4);
1452                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1453         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1454                 dprintk("Too many back channel attr bitmaps!\n");
1455                 goto xdr_error;
1456         }
1457
1458         READ_BUF(4);
1459         sess->callback_prog = be32_to_cpup(p++);
1460         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1461         DECODE_TAIL;
1462 }
1463
1464 static __be32
1465 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1466                              struct nfsd4_destroy_session *destroy_session)
1467 {
1468         DECODE_HEAD;
1469         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1470         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1471
1472         DECODE_TAIL;
1473 }
1474
1475 static __be32
1476 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1477                           struct nfsd4_free_stateid *free_stateid)
1478 {
1479         DECODE_HEAD;
1480
1481         READ_BUF(sizeof(stateid_t));
1482         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1483         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1484
1485         DECODE_TAIL;
1486 }
1487
1488 static __be32
1489 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1490                       struct nfsd4_sequence *seq)
1491 {
1492         DECODE_HEAD;
1493
1494         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1495         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1496         seq->seqid = be32_to_cpup(p++);
1497         seq->slotid = be32_to_cpup(p++);
1498         seq->maxslots = be32_to_cpup(p++);
1499         seq->cachethis = be32_to_cpup(p++);
1500
1501         DECODE_TAIL;
1502 }
1503
1504 static __be32
1505 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1506 {
1507         int i;
1508         __be32 *p, status;
1509         struct nfsd4_test_stateid_id *stateid;
1510
1511         READ_BUF(4);
1512         test_stateid->ts_num_ids = ntohl(*p++);
1513
1514         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1515
1516         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1517                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1518                 if (!stateid) {
1519                         status = nfserrno(-ENOMEM);
1520                         goto out;
1521                 }
1522
1523                 INIT_LIST_HEAD(&stateid->ts_id_list);
1524                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1525
1526                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1527                 if (status)
1528                         goto out;
1529         }
1530
1531         status = 0;
1532 out:
1533         return status;
1534 xdr_error:
1535         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1536         status = nfserr_bad_xdr;
1537         goto out;
1538 }
1539
1540 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1541 {
1542         DECODE_HEAD;
1543
1544         READ_BUF(8);
1545         COPYMEM(&dc->clientid, 8);
1546
1547         DECODE_TAIL;
1548 }
1549
1550 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1551 {
1552         DECODE_HEAD;
1553
1554         READ_BUF(4);
1555         rc->rca_one_fs = be32_to_cpup(p++);
1556
1557         DECODE_TAIL;
1558 }
1559
1560 #ifdef CONFIG_NFSD_PNFS
1561 static __be32
1562 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1563                 struct nfsd4_getdeviceinfo *gdev)
1564 {
1565         DECODE_HEAD;
1566         u32 num, i;
1567
1568         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1569         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1570         gdev->gd_layout_type = be32_to_cpup(p++);
1571         gdev->gd_maxcount = be32_to_cpup(p++);
1572         num = be32_to_cpup(p++);
1573         if (num) {
1574                 READ_BUF(4 * num);
1575                 gdev->gd_notify_types = be32_to_cpup(p++);
1576                 for (i = 1; i < num; i++) {
1577                         if (be32_to_cpup(p++)) {
1578                                 status = nfserr_inval;
1579                                 goto out;
1580                         }
1581                 }
1582         }
1583         DECODE_TAIL;
1584 }
1585
1586 static __be32
1587 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1588                 struct nfsd4_layoutget *lgp)
1589 {
1590         DECODE_HEAD;
1591
1592         READ_BUF(36);
1593         lgp->lg_signal = be32_to_cpup(p++);
1594         lgp->lg_layout_type = be32_to_cpup(p++);
1595         lgp->lg_seg.iomode = be32_to_cpup(p++);
1596         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1597         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1598         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1599
1600         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1601         if (status)
1602                 return status;
1603
1604         READ_BUF(4);
1605         lgp->lg_maxcount = be32_to_cpup(p++);
1606
1607         DECODE_TAIL;
1608 }
1609
1610 static __be32
1611 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1612                 struct nfsd4_layoutcommit *lcp)
1613 {
1614         DECODE_HEAD;
1615         u32 timechange;
1616
1617         READ_BUF(20);
1618         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1619         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1620         lcp->lc_reclaim = be32_to_cpup(p++);
1621
1622         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1623         if (status)
1624                 return status;
1625
1626         READ_BUF(4);
1627         lcp->lc_newoffset = be32_to_cpup(p++);
1628         if (lcp->lc_newoffset) {
1629                 READ_BUF(8);
1630                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1631         } else
1632                 lcp->lc_last_wr = 0;
1633         READ_BUF(4);
1634         timechange = be32_to_cpup(p++);
1635         if (timechange) {
1636                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1637                 if (status)
1638                         return status;
1639         } else {
1640                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1641         }
1642         READ_BUF(8);
1643         lcp->lc_layout_type = be32_to_cpup(p++);
1644
1645         /*
1646          * Save the layout update in XDR format and let the layout driver deal
1647          * with it later.
1648          */
1649         lcp->lc_up_len = be32_to_cpup(p++);
1650         if (lcp->lc_up_len > 0) {
1651                 READ_BUF(lcp->lc_up_len);
1652                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1653         }
1654
1655         DECODE_TAIL;
1656 }
1657
1658 static __be32
1659 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1660                 struct nfsd4_layoutreturn *lrp)
1661 {
1662         DECODE_HEAD;
1663
1664         READ_BUF(16);
1665         lrp->lr_reclaim = be32_to_cpup(p++);
1666         lrp->lr_layout_type = be32_to_cpup(p++);
1667         lrp->lr_seg.iomode = be32_to_cpup(p++);
1668         lrp->lr_return_type = be32_to_cpup(p++);
1669         if (lrp->lr_return_type == RETURN_FILE) {
1670                 READ_BUF(16);
1671                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1672                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1673
1674                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1675                 if (status)
1676                         return status;
1677
1678                 READ_BUF(4);
1679                 lrp->lrf_body_len = be32_to_cpup(p++);
1680                 if (lrp->lrf_body_len > 0) {
1681                         READ_BUF(lrp->lrf_body_len);
1682                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1683                 }
1684         } else {
1685                 lrp->lr_seg.offset = 0;
1686                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1687         }
1688
1689         DECODE_TAIL;
1690 }
1691 #endif /* CONFIG_NFSD_PNFS */
1692
1693 static __be32
1694 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1695                        struct nfsd4_fallocate *fallocate)
1696 {
1697         DECODE_HEAD;
1698
1699         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1700         if (status)
1701                 return status;
1702
1703         READ_BUF(16);
1704         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1705         xdr_decode_hyper(p, &fallocate->falloc_length);
1706
1707         DECODE_TAIL;
1708 }
1709
1710 static __be32
1711 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1712 {
1713         DECODE_HEAD;
1714
1715         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1716         if (status)
1717                 return status;
1718         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1719         if (status)
1720                 return status;
1721
1722         READ_BUF(8 + 8 + 8);
1723         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1724         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1725         p = xdr_decode_hyper(p, &clone->cl_count);
1726         DECODE_TAIL;
1727 }
1728
1729 static __be32
1730 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1731 {
1732         DECODE_HEAD;
1733         unsigned int tmp;
1734
1735         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1736         if (status)
1737                 return status;
1738         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1739         if (status)
1740                 return status;
1741
1742         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1743         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1744         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1745         p = xdr_decode_hyper(p, &copy->cp_count);
1746         copy->cp_consecutive = be32_to_cpup(p++);
1747         copy->cp_synchronous = be32_to_cpup(p++);
1748         tmp = be32_to_cpup(p); /* Source server list not supported */
1749
1750         DECODE_TAIL;
1751 }
1752
1753 static __be32
1754 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1755 {
1756         DECODE_HEAD;
1757
1758         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1759         if (status)
1760                 return status;
1761
1762         READ_BUF(8 + 4);
1763         p = xdr_decode_hyper(p, &seek->seek_offset);
1764         seek->seek_whence = be32_to_cpup(p);
1765
1766         DECODE_TAIL;
1767 }
1768
1769 static __be32
1770 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1771 {
1772         return nfs_ok;
1773 }
1774
1775 static __be32
1776 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1777 {
1778         return nfserr_notsupp;
1779 }
1780
1781 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1782
1783 static nfsd4_dec nfsd4_dec_ops[] = {
1784         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1785         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1786         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1787         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1788         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1789         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1790         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1791         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1792         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1793         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1794         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1795         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1796         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1797         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1798         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1799         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1800         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1801         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1802         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1803         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1804         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1805         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1806         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1807         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1808         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1809         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1810         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1811         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1812         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1813         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1814         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1815         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1816         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1817         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1818         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1819         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1820         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1821
1822         /* new operations for NFSv4.1 */
1823         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1824         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1825         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1826         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1827         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1828         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1829         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1830 #ifdef CONFIG_NFSD_PNFS
1831         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1832         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1833         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1834         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1835         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1836 #else
1837         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1838         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1839         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1840         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1841         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1842 #endif
1843         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1844         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1845         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1846         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1847         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1848         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1849         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1850
1851         /* new operations for NFSv4.2 */
1852         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1853         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1854         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1855         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1856         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1857         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1858         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1859         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1860         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1861         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1862         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1863         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1864         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1865 };
1866
1867 static inline bool
1868 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1869 {
1870         if (op->opnum < FIRST_NFS4_OP)
1871                 return false;
1872         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1873                 return false;
1874         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1875                 return false;
1876         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1877                 return false;
1878         return true;
1879 }
1880
1881 static __be32
1882 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1883 {
1884         DECODE_HEAD;
1885         struct nfsd4_op *op;
1886         bool cachethis = false;
1887         int auth_slack= argp->rqstp->rq_auth_slack;
1888         int max_reply = auth_slack + 8; /* opcnt, status */
1889         int readcount = 0;
1890         int readbytes = 0;
1891         int i;
1892
1893         READ_BUF(4);
1894         argp->taglen = be32_to_cpup(p++);
1895         READ_BUF(argp->taglen);
1896         SAVEMEM(argp->tag, argp->taglen);
1897         READ_BUF(8);
1898         argp->minorversion = be32_to_cpup(p++);
1899         argp->opcnt = be32_to_cpup(p++);
1900         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1901
1902         if (argp->taglen > NFSD4_MAX_TAGLEN)
1903                 goto xdr_error;
1904         if (argp->opcnt > 100)
1905                 goto xdr_error;
1906
1907         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1908                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1909                 if (!argp->ops) {
1910                         argp->ops = argp->iops;
1911                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1912                         goto xdr_error;
1913                 }
1914         }
1915
1916         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1917                 argp->opcnt = 0;
1918
1919         for (i = 0; i < argp->opcnt; i++) {
1920                 op = &argp->ops[i];
1921                 op->replay = NULL;
1922
1923                 READ_BUF(4);
1924                 op->opnum = be32_to_cpup(p++);
1925
1926                 if (nfsd4_opnum_in_range(argp, op))
1927                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1928                 else {
1929                         op->opnum = OP_ILLEGAL;
1930                         op->status = nfserr_op_illegal;
1931                 }
1932                 /*
1933                  * We'll try to cache the result in the DRC if any one
1934                  * op in the compound wants to be cached:
1935                  */
1936                 cachethis |= nfsd4_cache_this_op(op);
1937
1938                 if (op->opnum == OP_READ) {
1939                         readcount++;
1940                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1941                 } else
1942                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1943                 /*
1944                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
1945                  * (Special case because it will just skip encoding this
1946                  * if it runs out of xdr buffer space, and it is the only
1947                  * operation that behaves this way.)
1948                  */
1949                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1950                         max_reply += NFS4_OPAQUE_LIMIT;
1951
1952                 if (op->status) {
1953                         argp->opcnt = i+1;
1954                         break;
1955                 }
1956         }
1957         /* Sessions make the DRC unnecessary: */
1958         if (argp->minorversion)
1959                 cachethis = false;
1960         svc_reserve(argp->rqstp, max_reply + readbytes);
1961         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1962
1963         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1964                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1965
1966         DECODE_TAIL;
1967 }
1968
1969 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
1970                              struct svc_export *exp)
1971 {
1972         if (exp->ex_flags & NFSEXP_V4ROOT) {
1973                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
1974                 *p++ = 0;
1975         } else if (IS_I_VERSION(inode)) {
1976                 p = xdr_encode_hyper(p, nfsd4_change_attribute(inode));
1977         } else {
1978                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1979                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1980         }
1981         return p;
1982 }
1983
1984 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1985 {
1986         *p++ = cpu_to_be32(c->atomic);
1987         if (c->change_supported) {
1988                 p = xdr_encode_hyper(p, c->before_change);
1989                 p = xdr_encode_hyper(p, c->after_change);
1990         } else {
1991                 *p++ = cpu_to_be32(c->before_ctime_sec);
1992                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1993                 *p++ = cpu_to_be32(c->after_ctime_sec);
1994                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1995         }
1996         return p;
1997 }
1998
1999 /* Encode as an array of strings the string given with components
2000  * separated @sep, escaped with esc_enter and esc_exit.
2001  */
2002 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2003                                           char *components, char esc_enter,
2004                                           char esc_exit)
2005 {
2006         __be32 *p;
2007         __be32 pathlen;
2008         int pathlen_offset;
2009         int strlen, count=0;
2010         char *str, *end, *next;
2011
2012         dprintk("nfsd4_encode_components(%s)\n", components);
2013
2014         pathlen_offset = xdr->buf->len;
2015         p = xdr_reserve_space(xdr, 4);
2016         if (!p)
2017                 return nfserr_resource;
2018         p++; /* We will fill this in with @count later */
2019
2020         end = str = components;
2021         while (*end) {
2022                 bool found_esc = false;
2023
2024                 /* try to parse as esc_start, ..., esc_end, sep */
2025                 if (*str == esc_enter) {
2026                         for (; *end && (*end != esc_exit); end++)
2027                                 /* find esc_exit or end of string */;
2028                         next = end + 1;
2029                         if (*end && (!*next || *next == sep)) {
2030                                 str++;
2031                                 found_esc = true;
2032                         }
2033                 }
2034
2035                 if (!found_esc)
2036                         for (; *end && (*end != sep); end++)
2037                                 /* find sep or end of string */;
2038
2039                 strlen = end - str;
2040                 if (strlen) {
2041                         p = xdr_reserve_space(xdr, strlen + 4);
2042                         if (!p)
2043                                 return nfserr_resource;
2044                         p = xdr_encode_opaque(p, str, strlen);
2045                         count++;
2046                 }
2047                 else
2048                         end++;
2049                 if (found_esc)
2050                         end = next;
2051
2052                 str = end;
2053         }
2054         pathlen = htonl(count);
2055         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2056         return 0;
2057 }
2058
2059 /* Encode as an array of strings the string given with components
2060  * separated @sep.
2061  */
2062 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2063                                       char *components)
2064 {
2065         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2066 }
2067
2068 /*
2069  * encode a location element of a fs_locations structure
2070  */
2071 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2072                                         struct nfsd4_fs_location *location)
2073 {
2074         __be32 status;
2075
2076         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2077                                                 '[', ']');
2078         if (status)
2079                 return status;
2080         status = nfsd4_encode_components(xdr, '/', location->path);
2081         if (status)
2082                 return status;
2083         return 0;
2084 }
2085
2086 /*
2087  * Encode a path in RFC3530 'pathname4' format
2088  */
2089 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2090                                 const struct path *root,
2091                                 const struct path *path)
2092 {
2093         struct path cur = *path;
2094         __be32 *p;
2095         struct dentry **components = NULL;
2096         unsigned int ncomponents = 0;
2097         __be32 err = nfserr_jukebox;
2098
2099         dprintk("nfsd4_encode_components(");
2100
2101         path_get(&cur);
2102         /* First walk the path up to the nfsd root, and store the
2103          * dentries/path components in an array.
2104          */
2105         for (;;) {
2106                 if (path_equal(&cur, root))
2107                         break;
2108                 if (cur.dentry == cur.mnt->mnt_root) {
2109                         if (follow_up(&cur))
2110                                 continue;
2111                         goto out_free;
2112                 }
2113                 if ((ncomponents & 15) == 0) {
2114                         struct dentry **new;
2115                         new = krealloc(components,
2116                                         sizeof(*new) * (ncomponents + 16),
2117                                         GFP_KERNEL);
2118                         if (!new)
2119                                 goto out_free;
2120                         components = new;
2121                 }
2122                 components[ncomponents++] = cur.dentry;
2123                 cur.dentry = dget_parent(cur.dentry);
2124         }
2125         err = nfserr_resource;
2126         p = xdr_reserve_space(xdr, 4);
2127         if (!p)
2128                 goto out_free;
2129         *p++ = cpu_to_be32(ncomponents);
2130
2131         while (ncomponents) {
2132                 struct dentry *dentry = components[ncomponents - 1];
2133                 unsigned int len;
2134
2135                 spin_lock(&dentry->d_lock);
2136                 len = dentry->d_name.len;
2137                 p = xdr_reserve_space(xdr, len + 4);
2138                 if (!p) {
2139                         spin_unlock(&dentry->d_lock);
2140                         goto out_free;
2141                 }
2142                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2143                 dprintk("/%pd", dentry);
2144                 spin_unlock(&dentry->d_lock);
2145                 dput(dentry);
2146                 ncomponents--;
2147         }
2148
2149         err = 0;
2150 out_free:
2151         dprintk(")\n");
2152         while (ncomponents)
2153                 dput(components[--ncomponents]);
2154         kfree(components);
2155         path_put(&cur);
2156         return err;
2157 }
2158
2159 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2160                         struct svc_rqst *rqstp, const struct path *path)
2161 {
2162         struct svc_export *exp_ps;
2163         __be32 res;
2164
2165         exp_ps = rqst_find_fsidzero_export(rqstp);
2166         if (IS_ERR(exp_ps))
2167                 return nfserrno(PTR_ERR(exp_ps));
2168         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2169         exp_put(exp_ps);
2170         return res;
2171 }
2172
2173 /*
2174  *  encode a fs_locations structure
2175  */
2176 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2177                         struct svc_rqst *rqstp, struct svc_export *exp)
2178 {
2179         __be32 status;
2180         int i;
2181         __be32 *p;
2182         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2183
2184         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2185         if (status)
2186                 return status;
2187         p = xdr_reserve_space(xdr, 4);
2188         if (!p)
2189                 return nfserr_resource;
2190         *p++ = cpu_to_be32(fslocs->locations_count);
2191         for (i=0; i<fslocs->locations_count; i++) {
2192                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2193                 if (status)
2194                         return status;
2195         }
2196         return 0;
2197 }
2198
2199 static u32 nfs4_file_type(umode_t mode)
2200 {
2201         switch (mode & S_IFMT) {
2202         case S_IFIFO:   return NF4FIFO;
2203         case S_IFCHR:   return NF4CHR;
2204         case S_IFDIR:   return NF4DIR;
2205         case S_IFBLK:   return NF4BLK;
2206         case S_IFLNK:   return NF4LNK;
2207         case S_IFREG:   return NF4REG;
2208         case S_IFSOCK:  return NF4SOCK;
2209         default:        return NF4BAD;
2210         };
2211 }
2212
2213 static inline __be32
2214 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2215                      struct nfs4_ace *ace)
2216 {
2217         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2218                 return nfs4_acl_write_who(xdr, ace->whotype);
2219         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2220                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2221         else
2222                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2223 }
2224
2225 static inline __be32
2226 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2227 {
2228         __be32          *p;
2229         unsigned long   i = hweight_long(layout_types);
2230
2231         p = xdr_reserve_space(xdr, 4 + 4 * i);
2232         if (!p)
2233                 return nfserr_resource;
2234
2235         *p++ = cpu_to_be32(i);
2236
2237         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2238                 if (layout_types & (1 << i))
2239                         *p++ = cpu_to_be32(i);
2240
2241         return 0;
2242 }
2243
2244 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2245                               FATTR4_WORD0_RDATTR_ERROR)
2246 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2247 #define WORD2_ABSENT_FS_ATTRS 0
2248
2249 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2250 static inline __be32
2251 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2252                             void *context, int len)
2253 {
2254         __be32 *p;
2255
2256         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2257         if (!p)
2258                 return nfserr_resource;
2259
2260         /*
2261          * For now we use a 0 here to indicate the null translation; in
2262          * the future we may place a call to translation code here.
2263          */
2264         *p++ = cpu_to_be32(0); /* lfs */
2265         *p++ = cpu_to_be32(0); /* pi */
2266         p = xdr_encode_opaque(p, context, len);
2267         return 0;
2268 }
2269 #else
2270 static inline __be32
2271 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2272                             void *context, int len)
2273 { return 0; }
2274 #endif
2275
2276 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2277 {
2278         /* As per referral draft:  */
2279         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2280             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2281                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2282                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2283                         *rdattr_err = NFSERR_MOVED;
2284                 else
2285                         return nfserr_moved;
2286         }
2287         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2288         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2289         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2290         return 0;
2291 }
2292
2293
2294 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2295 {
2296         struct path path = exp->ex_path;
2297         int err;
2298
2299         path_get(&path);
2300         while (follow_up(&path)) {
2301                 if (path.dentry != path.mnt->mnt_root)
2302                         break;
2303         }
2304         err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2305         path_put(&path);
2306         return err;
2307 }
2308
2309 static __be32
2310 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2311 {
2312         __be32 *p;
2313
2314         if (bmval2) {
2315                 p = xdr_reserve_space(xdr, 16);
2316                 if (!p)
2317                         goto out_resource;
2318                 *p++ = cpu_to_be32(3);
2319                 *p++ = cpu_to_be32(bmval0);
2320                 *p++ = cpu_to_be32(bmval1);
2321                 *p++ = cpu_to_be32(bmval2);
2322         } else if (bmval1) {
2323                 p = xdr_reserve_space(xdr, 12);
2324                 if (!p)
2325                         goto out_resource;
2326                 *p++ = cpu_to_be32(2);
2327                 *p++ = cpu_to_be32(bmval0);
2328                 *p++ = cpu_to_be32(bmval1);
2329         } else {
2330                 p = xdr_reserve_space(xdr, 8);
2331                 if (!p)
2332                         goto out_resource;
2333                 *p++ = cpu_to_be32(1);
2334                 *p++ = cpu_to_be32(bmval0);
2335         }
2336
2337         return 0;
2338 out_resource:
2339         return nfserr_resource;
2340 }
2341
2342 /*
2343  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2344  * ourselves.
2345  */
2346 static __be32
2347 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2348                 struct svc_export *exp,
2349                 struct dentry *dentry, u32 *bmval,
2350                 struct svc_rqst *rqstp, int ignore_crossmnt)
2351 {
2352         u32 bmval0 = bmval[0];
2353         u32 bmval1 = bmval[1];
2354         u32 bmval2 = bmval[2];
2355         struct kstat stat;
2356         struct svc_fh *tempfh = NULL;
2357         struct kstatfs statfs;
2358         __be32 *p;
2359         int starting_len = xdr->buf->len;
2360         int attrlen_offset;
2361         __be32 attrlen;
2362         u32 dummy;
2363         u64 dummy64;
2364         u32 rdattr_err = 0;
2365         __be32 status;
2366         int err;
2367         struct nfs4_acl *acl = NULL;
2368         void *context = NULL;
2369         int contextlen;
2370         bool contextsupport = false;
2371         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2372         u32 minorversion = resp->cstate.minorversion;
2373         struct path path = {
2374                 .mnt    = exp->ex_path.mnt,
2375                 .dentry = dentry,
2376         };
2377         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2378
2379         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2380         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2381
2382         if (exp->ex_fslocs.migrated) {
2383                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2384                 if (status)
2385                         goto out;
2386         }
2387
2388         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2389         if (err)
2390                 goto out_nfserr;
2391         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2392                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2393             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2394                        FATTR4_WORD1_SPACE_TOTAL))) {
2395                 err = vfs_statfs(&path, &statfs);
2396                 if (err)
2397                         goto out_nfserr;
2398         }
2399         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2400                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2401                 status = nfserr_jukebox;
2402                 if (!tempfh)
2403                         goto out;
2404                 fh_init(tempfh, NFS4_FHSIZE);
2405                 status = fh_compose(tempfh, exp, dentry, NULL);
2406                 if (status)
2407                         goto out;
2408                 fhp = tempfh;
2409         }
2410         if (bmval0 & FATTR4_WORD0_ACL) {
2411                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2412                 if (err == -EOPNOTSUPP)
2413                         bmval0 &= ~FATTR4_WORD0_ACL;
2414                 else if (err == -EINVAL) {
2415                         status = nfserr_attrnotsupp;
2416                         goto out;
2417                 } else if (err != 0)
2418                         goto out_nfserr;
2419         }
2420
2421 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2422         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2423              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2424                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2425                         err = security_inode_getsecctx(d_inode(dentry),
2426                                                 &context, &contextlen);
2427                 else
2428                         err = -EOPNOTSUPP;
2429                 contextsupport = (err == 0);
2430                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2431                         if (err == -EOPNOTSUPP)
2432                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2433                         else if (err)
2434                                 goto out_nfserr;
2435                 }
2436         }
2437 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2438
2439         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2440         if (status)
2441                 goto out;
2442
2443         attrlen_offset = xdr->buf->len;
2444         p = xdr_reserve_space(xdr, 4);
2445         if (!p)
2446                 goto out_resource;
2447         p++;                /* to be backfilled later */
2448
2449         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2450                 u32 supp[3];
2451
2452                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2453
2454                 if (!IS_POSIXACL(dentry->d_inode))
2455                         supp[0] &= ~FATTR4_WORD0_ACL;
2456                 if (!contextsupport)
2457                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2458                 if (!supp[2]) {
2459                         p = xdr_reserve_space(xdr, 12);
2460                         if (!p)
2461                                 goto out_resource;
2462                         *p++ = cpu_to_be32(2);
2463                         *p++ = cpu_to_be32(supp[0]);
2464                         *p++ = cpu_to_be32(supp[1]);
2465                 } else {
2466                         p = xdr_reserve_space(xdr, 16);
2467                         if (!p)
2468                                 goto out_resource;
2469                         *p++ = cpu_to_be32(3);
2470                         *p++ = cpu_to_be32(supp[0]);
2471                         *p++ = cpu_to_be32(supp[1]);
2472                         *p++ = cpu_to_be32(supp[2]);
2473                 }
2474         }
2475         if (bmval0 & FATTR4_WORD0_TYPE) {
2476                 p = xdr_reserve_space(xdr, 4);
2477                 if (!p)
2478                         goto out_resource;
2479                 dummy = nfs4_file_type(stat.mode);
2480                 if (dummy == NF4BAD) {
2481                         status = nfserr_serverfault;
2482                         goto out;
2483                 }
2484                 *p++ = cpu_to_be32(dummy);
2485         }
2486         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2487                 p = xdr_reserve_space(xdr, 4);
2488                 if (!p)
2489                         goto out_resource;
2490                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2491                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2492                 else
2493                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2494                                                 NFS4_FH_VOL_RENAME);
2495         }
2496         if (bmval0 & FATTR4_WORD0_CHANGE) {
2497                 p = xdr_reserve_space(xdr, 8);
2498                 if (!p)
2499                         goto out_resource;
2500                 p = encode_change(p, &stat, d_inode(dentry), exp);
2501         }
2502         if (bmval0 & FATTR4_WORD0_SIZE) {
2503                 p = xdr_reserve_space(xdr, 8);
2504                 if (!p)
2505                         goto out_resource;
2506                 p = xdr_encode_hyper(p, stat.size);
2507         }
2508         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2509                 p = xdr_reserve_space(xdr, 4);
2510                 if (!p)
2511                         goto out_resource;
2512                 *p++ = cpu_to_be32(1);
2513         }
2514         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2515                 p = xdr_reserve_space(xdr, 4);
2516                 if (!p)
2517                         goto out_resource;
2518                 *p++ = cpu_to_be32(1);
2519         }
2520         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2521                 p = xdr_reserve_space(xdr, 4);
2522                 if (!p)
2523                         goto out_resource;
2524                 *p++ = cpu_to_be32(0);
2525         }
2526         if (bmval0 & FATTR4_WORD0_FSID) {
2527                 p = xdr_reserve_space(xdr, 16);
2528                 if (!p)
2529                         goto out_resource;
2530                 if (exp->ex_fslocs.migrated) {
2531                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2532                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2533                 } else switch(fsid_source(fhp)) {
2534                 case FSIDSOURCE_FSID:
2535                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2536                         p = xdr_encode_hyper(p, (u64)0);
2537                         break;
2538                 case FSIDSOURCE_DEV:
2539                         *p++ = cpu_to_be32(0);
2540                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2541                         *p++ = cpu_to_be32(0);
2542                         *p++ = cpu_to_be32(MINOR(stat.dev));
2543                         break;
2544                 case FSIDSOURCE_UUID:
2545                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2546                                                                 EX_UUID_LEN);
2547                         break;
2548                 }
2549         }
2550         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2551                 p = xdr_reserve_space(xdr, 4);
2552                 if (!p)
2553                         goto out_resource;
2554                 *p++ = cpu_to_be32(0);
2555         }
2556         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2557                 p = xdr_reserve_space(xdr, 4);
2558                 if (!p)
2559                         goto out_resource;
2560                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2561         }
2562         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2563                 p = xdr_reserve_space(xdr, 4);
2564                 if (!p)
2565                         goto out_resource;
2566                 *p++ = cpu_to_be32(rdattr_err);
2567         }
2568         if (bmval0 & FATTR4_WORD0_ACL) {
2569                 struct nfs4_ace *ace;
2570
2571                 if (acl == NULL) {
2572                         p = xdr_reserve_space(xdr, 4);
2573                         if (!p)
2574                                 goto out_resource;
2575
2576                         *p++ = cpu_to_be32(0);
2577                         goto out_acl;
2578                 }
2579                 p = xdr_reserve_space(xdr, 4);
2580                 if (!p)
2581                         goto out_resource;
2582                 *p++ = cpu_to_be32(acl->naces);
2583
2584                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2585                         p = xdr_reserve_space(xdr, 4*3);
2586                         if (!p)
2587                                 goto out_resource;
2588                         *p++ = cpu_to_be32(ace->type);
2589                         *p++ = cpu_to_be32(ace->flag);
2590                         *p++ = cpu_to_be32(ace->access_mask &
2591                                                         NFS4_ACE_MASK_ALL);
2592                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2593                         if (status)
2594                                 goto out;
2595                 }
2596         }
2597 out_acl:
2598         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2599                 p = xdr_reserve_space(xdr, 4);
2600                 if (!p)
2601                         goto out_resource;
2602                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2603                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2604         }
2605         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2606                 p = xdr_reserve_space(xdr, 4);
2607                 if (!p)
2608                         goto out_resource;
2609                 *p++ = cpu_to_be32(1);
2610         }
2611         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2612                 p = xdr_reserve_space(xdr, 4);
2613                 if (!p)
2614                         goto out_resource;
2615                 *p++ = cpu_to_be32(0);
2616         }
2617         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2618                 p = xdr_reserve_space(xdr, 4);
2619                 if (!p)
2620                         goto out_resource;
2621                 *p++ = cpu_to_be32(1);
2622         }
2623         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2624                 p = xdr_reserve_space(xdr, 4);
2625                 if (!p)
2626                         goto out_resource;
2627                 *p++ = cpu_to_be32(1);
2628         }
2629         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2630                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2631                 if (!p)
2632                         goto out_resource;
2633                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2634                                         fhp->fh_handle.fh_size);
2635         }
2636         if (bmval0 & FATTR4_WORD0_FILEID) {
2637                 p = xdr_reserve_space(xdr, 8);
2638                 if (!p)
2639                         goto out_resource;
2640                 p = xdr_encode_hyper(p, stat.ino);
2641         }
2642         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2643                 p = xdr_reserve_space(xdr, 8);
2644                 if (!p)
2645                         goto out_resource;
2646                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2647         }
2648         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2649                 p = xdr_reserve_space(xdr, 8);
2650                 if (!p)
2651                         goto out_resource;
2652                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2653         }
2654         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2655                 p = xdr_reserve_space(xdr, 8);
2656                 if (!p)
2657                         goto out_resource;
2658                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2659         }
2660         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2661                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2662                 if (status)
2663                         goto out;
2664         }
2665         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2666                 p = xdr_reserve_space(xdr, 4);
2667                 if (!p)
2668                         goto out_resource;
2669                 *p++ = cpu_to_be32(1);
2670         }
2671         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2672                 p = xdr_reserve_space(xdr, 8);
2673                 if (!p)
2674                         goto out_resource;
2675                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2676         }
2677         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2678                 p = xdr_reserve_space(xdr, 4);
2679                 if (!p)
2680                         goto out_resource;
2681                 *p++ = cpu_to_be32(255);
2682         }
2683         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2684                 p = xdr_reserve_space(xdr, 4);
2685                 if (!p)
2686                         goto out_resource;
2687                 *p++ = cpu_to_be32(statfs.f_namelen);
2688         }
2689         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2690                 p = xdr_reserve_space(xdr, 8);
2691                 if (!p)
2692                         goto out_resource;
2693                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2694         }
2695         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2696                 p = xdr_reserve_space(xdr, 8);
2697                 if (!p)
2698                         goto out_resource;
2699                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2700         }
2701         if (bmval1 & FATTR4_WORD1_MODE) {
2702                 p = xdr_reserve_space(xdr, 4);
2703                 if (!p)
2704                         goto out_resource;
2705                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2706         }
2707         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2708                 p = xdr_reserve_space(xdr, 4);
2709                 if (!p)
2710                         goto out_resource;
2711                 *p++ = cpu_to_be32(1);
2712         }
2713         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2714                 p = xdr_reserve_space(xdr, 4);
2715                 if (!p)
2716                         goto out_resource;
2717                 *p++ = cpu_to_be32(stat.nlink);
2718         }
2719         if (bmval1 & FATTR4_WORD1_OWNER) {
2720                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2721                 if (status)
2722                         goto out;
2723         }
2724         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2725                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2726                 if (status)
2727                         goto out;
2728         }
2729         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2730                 p = xdr_reserve_space(xdr, 8);
2731                 if (!p)
2732                         goto out_resource;
2733                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2734                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2735         }
2736         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2737                 p = xdr_reserve_space(xdr, 8);
2738                 if (!p)
2739                         goto out_resource;
2740                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2741                 p = xdr_encode_hyper(p, dummy64);
2742         }
2743         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2744                 p = xdr_reserve_space(xdr, 8);
2745                 if (!p)
2746                         goto out_resource;
2747                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2748                 p = xdr_encode_hyper(p, dummy64);
2749         }
2750         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2751                 p = xdr_reserve_space(xdr, 8);
2752                 if (!p)
2753                         goto out_resource;
2754                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2755                 p = xdr_encode_hyper(p, dummy64);
2756         }
2757         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2758                 p = xdr_reserve_space(xdr, 8);
2759                 if (!p)
2760                         goto out_resource;
2761                 dummy64 = (u64)stat.blocks << 9;
2762                 p = xdr_encode_hyper(p, dummy64);
2763         }
2764         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2765                 p = xdr_reserve_space(xdr, 12);
2766                 if (!p)
2767                         goto out_resource;
2768                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2769                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2770         }
2771         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2772                 p = xdr_reserve_space(xdr, 12);
2773                 if (!p)
2774                         goto out_resource;
2775                 *p++ = cpu_to_be32(0);
2776                 *p++ = cpu_to_be32(1);
2777                 *p++ = cpu_to_be32(0);
2778         }
2779         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2780                 p = xdr_reserve_space(xdr, 12);
2781                 if (!p)
2782                         goto out_resource;
2783                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2784                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2785         }
2786         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2787                 p = xdr_reserve_space(xdr, 12);
2788                 if (!p)
2789                         goto out_resource;
2790                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2791                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2792         }
2793         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2794                 struct kstat parent_stat;
2795                 u64 ino = stat.ino;
2796
2797                 p = xdr_reserve_space(xdr, 8);
2798                 if (!p)
2799                         goto out_resource;
2800                 /*
2801                  * Get parent's attributes if not ignoring crossmount
2802                  * and this is the root of a cross-mounted filesystem.
2803                  */
2804                 if (ignore_crossmnt == 0 &&
2805                     dentry == exp->ex_path.mnt->mnt_root) {
2806                         err = get_parent_attributes(exp, &parent_stat);
2807                         if (err)
2808                                 goto out_nfserr;
2809                         ino = parent_stat.ino;
2810                 }
2811                 p = xdr_encode_hyper(p, ino);
2812         }
2813 #ifdef CONFIG_NFSD_PNFS
2814         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2815                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2816                 if (status)
2817                         goto out;
2818         }
2819
2820         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2821                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2822                 if (status)
2823                         goto out;
2824         }
2825
2826         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2827                 p = xdr_reserve_space(xdr, 4);
2828                 if (!p)
2829                         goto out_resource;
2830                 *p++ = cpu_to_be32(stat.blksize);
2831         }
2832 #endif /* CONFIG_NFSD_PNFS */
2833         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2834                 u32 supp[3];
2835
2836                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2837                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2838                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2839                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2840
2841                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2842                 if (status)
2843                         goto out;
2844         }
2845
2846         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2847                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2848                                                                 contextlen);
2849                 if (status)
2850                         goto out;
2851         }
2852
2853         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2854         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2855         status = nfs_ok;
2856
2857 out:
2858 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2859         if (context)
2860                 security_release_secctx(context, contextlen);
2861 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2862         kfree(acl);
2863         if (tempfh) {
2864                 fh_put(tempfh);
2865                 kfree(tempfh);
2866         }
2867         if (status)
2868                 xdr_truncate_encode(xdr, starting_len);
2869         return status;
2870 out_nfserr:
2871         status = nfserrno(err);
2872         goto out;
2873 out_resource:
2874         status = nfserr_resource;
2875         goto out;
2876 }
2877
2878 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2879                                 struct xdr_buf *buf, __be32 *p, int bytes)
2880 {
2881         xdr->scratch.iov_len = 0;
2882         memset(buf, 0, sizeof(struct xdr_buf));
2883         buf->head[0].iov_base = p;
2884         buf->head[0].iov_len = 0;
2885         buf->len = 0;
2886         xdr->buf = buf;
2887         xdr->iov = buf->head;
2888         xdr->p = p;
2889         xdr->end = (void *)p + bytes;
2890         buf->buflen = bytes;
2891 }
2892
2893 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2894                         struct svc_fh *fhp, struct svc_export *exp,
2895                         struct dentry *dentry, u32 *bmval,
2896                         struct svc_rqst *rqstp, int ignore_crossmnt)
2897 {
2898         struct xdr_buf dummy;
2899         struct xdr_stream xdr;
2900         __be32 ret;
2901
2902         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2903         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2904                                                         ignore_crossmnt);
2905         *p = xdr.p;
2906         return ret;
2907 }
2908
2909 static inline int attributes_need_mount(u32 *bmval)
2910 {
2911         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2912                 return 1;
2913         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2914                 return 1;
2915         return 0;
2916 }
2917
2918 static __be32
2919 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2920                         const char *name, int namlen)
2921 {
2922         struct svc_export *exp = cd->rd_fhp->fh_export;
2923         struct dentry *dentry;
2924         __be32 nfserr;
2925         int ignore_crossmnt = 0;
2926
2927         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2928         if (IS_ERR(dentry))
2929                 return nfserrno(PTR_ERR(dentry));
2930         if (d_really_is_negative(dentry)) {
2931                 /*
2932                  * we're not holding the i_mutex here, so there's
2933                  * a window where this directory entry could have gone
2934                  * away.
2935                  */
2936                 dput(dentry);
2937                 return nfserr_noent;
2938         }
2939
2940         exp_get(exp);
2941         /*
2942          * In the case of a mountpoint, the client may be asking for
2943          * attributes that are only properties of the underlying filesystem
2944          * as opposed to the cross-mounted file system. In such a case,
2945          * we will not follow the cross mount and will fill the attribtutes
2946          * directly from the mountpoint dentry.
2947          */
2948         if (nfsd_mountpoint(dentry, exp)) {
2949                 int err;
2950
2951                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2952                                 && !attributes_need_mount(cd->rd_bmval)) {
2953                         ignore_crossmnt = 1;
2954                         goto out_encode;
2955                 }
2956                 /*
2957                  * Why the heck aren't we just using nfsd_lookup??
2958                  * Different "."/".." handling?  Something else?
2959                  * At least, add a comment here to explain....
2960                  */
2961                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2962                 if (err) {
2963                         nfserr = nfserrno(err);
2964                         goto out_put;
2965                 }
2966                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2967                 if (nfserr)
2968                         goto out_put;
2969
2970         }
2971 out_encode:
2972         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2973                                         cd->rd_rqstp, ignore_crossmnt);
2974 out_put:
2975         dput(dentry);
2976         exp_put(exp);
2977         return nfserr;
2978 }
2979
2980 static __be32 *
2981 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2982 {
2983         __be32 *p;
2984
2985         p = xdr_reserve_space(xdr, 20);
2986         if (!p)
2987                 return NULL;
2988         *p++ = htonl(2);
2989         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2990         *p++ = htonl(0);                         /* bmval1 */
2991
2992         *p++ = htonl(4);     /* attribute length */
2993         *p++ = nfserr;       /* no htonl */
2994         return p;
2995 }
2996
2997 static int
2998 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2999                     loff_t offset, u64 ino, unsigned int d_type)
3000 {
3001         struct readdir_cd *ccd = ccdv;
3002         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3003         struct xdr_stream *xdr = cd->xdr;
3004         int start_offset = xdr->buf->len;
3005         int cookie_offset;
3006         u32 name_and_cookie;
3007         int entry_bytes;
3008         __be32 nfserr = nfserr_toosmall;
3009         __be64 wire_offset;
3010         __be32 *p;
3011
3012         /* In nfsv4, "." and ".." never make it onto the wire.. */
3013         if (name && isdotent(name, namlen)) {
3014                 cd->common.err = nfs_ok;
3015                 return 0;
3016         }
3017
3018         if (cd->cookie_offset) {
3019                 wire_offset = cpu_to_be64(offset);
3020                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3021                                                         &wire_offset, 8);
3022         }
3023
3024         p = xdr_reserve_space(xdr, 4);
3025         if (!p)
3026                 goto fail;
3027         *p++ = xdr_one;                             /* mark entry present */
3028         cookie_offset = xdr->buf->len;
3029         p = xdr_reserve_space(xdr, 3*4 + namlen);
3030         if (!p)
3031                 goto fail;
3032         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3033         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3034
3035         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3036         switch (nfserr) {
3037         case nfs_ok:
3038                 break;
3039         case nfserr_resource:
3040                 nfserr = nfserr_toosmall;
3041                 goto fail;
3042         case nfserr_noent:
3043                 xdr_truncate_encode(xdr, start_offset);
3044                 goto skip_entry;
3045         default:
3046                 /*
3047                  * If the client requested the RDATTR_ERROR attribute,
3048                  * we stuff the error code into this attribute
3049                  * and continue.  If this attribute was not requested,
3050                  * then in accordance with the spec, we fail the
3051                  * entire READDIR operation(!)
3052                  */
3053                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3054                         goto fail;
3055                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3056                 if (p == NULL) {
3057                         nfserr = nfserr_toosmall;
3058                         goto fail;
3059                 }
3060         }
3061         nfserr = nfserr_toosmall;
3062         entry_bytes = xdr->buf->len - start_offset;
3063         if (entry_bytes > cd->rd_maxcount)
3064                 goto fail;
3065         cd->rd_maxcount -= entry_bytes;
3066         /*
3067          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3068          * let's always let through the first entry, at least:
3069          */
3070         if (!cd->rd_dircount)
3071                 goto fail;
3072         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3073         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3074                 goto fail;
3075         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3076
3077         cd->cookie_offset = cookie_offset;
3078 skip_entry:
3079         cd->common.err = nfs_ok;
3080         return 0;
3081 fail:
3082         xdr_truncate_encode(xdr, start_offset);
3083         cd->common.err = nfserr;
3084         return -EINVAL;
3085 }
3086
3087 static __be32
3088 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3089 {
3090         __be32 *p;
3091
3092         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3093         if (!p)
3094                 return nfserr_resource;
3095         *p++ = cpu_to_be32(sid->si_generation);
3096         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3097                                         sizeof(stateid_opaque_t));
3098         return 0;
3099 }
3100
3101 static __be32
3102 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3103 {
3104         struct xdr_stream *xdr = &resp->xdr;
3105         __be32 *p;
3106
3107         if (!nfserr) {
3108                 p = xdr_reserve_space(xdr, 8);
3109                 if (!p)
3110                         return nfserr_resource;
3111                 *p++ = cpu_to_be32(access->ac_supported);
3112                 *p++ = cpu_to_be32(access->ac_resp_access);
3113         }
3114         return nfserr;
3115 }
3116
3117 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3118 {
3119         struct xdr_stream *xdr = &resp->xdr;
3120         __be32 *p;
3121
3122         if (!nfserr) {
3123                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3124                 if (!p)
3125                         return nfserr_resource;
3126                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3127                                                 NFS4_MAX_SESSIONID_LEN);
3128                 *p++ = cpu_to_be32(bcts->dir);
3129                 /* Upshifting from TCP to RDMA is not supported */
3130                 *p++ = cpu_to_be32(0);
3131         }
3132         return nfserr;
3133 }
3134
3135 static __be32
3136 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3137 {
3138         struct xdr_stream *xdr = &resp->xdr;
3139
3140         if (!nfserr)
3141                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3142
3143         return nfserr;
3144 }
3145
3146
3147 static __be32
3148 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3149 {
3150         struct xdr_stream *xdr = &resp->xdr;
3151         __be32 *p;
3152
3153         if (!nfserr) {
3154                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3155                 if (!p)
3156                         return nfserr_resource;
3157                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3158                                                 NFS4_VERIFIER_SIZE);
3159         }
3160         return nfserr;
3161 }
3162
3163 static __be32
3164 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3165 {
3166         struct xdr_stream *xdr = &resp->xdr;
3167         __be32 *p;
3168
3169         if (!nfserr) {
3170                 p = xdr_reserve_space(xdr, 20);
3171                 if (!p)
3172                         return nfserr_resource;
3173                 encode_cinfo(p, &create->cr_cinfo);
3174                 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3175                                 create->cr_bmval[1], create->cr_bmval[2]);
3176         }
3177         return nfserr;
3178 }
3179
3180 static __be32
3181 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3182 {
3183         struct svc_fh *fhp = getattr->ga_fhp;
3184         struct xdr_stream *xdr = &resp->xdr;
3185
3186         if (nfserr)
3187                 return nfserr;
3188
3189         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3190                                     getattr->ga_bmval,
3191                                     resp->rqstp, 0);
3192         return nfserr;
3193 }
3194
3195 static __be32
3196 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3197 {
3198         struct xdr_stream *xdr = &resp->xdr;
3199         struct svc_fh *fhp = *fhpp;
3200         unsigned int len;
3201         __be32 *p;
3202
3203         if (!nfserr) {
3204                 len = fhp->fh_handle.fh_size;
3205                 p = xdr_reserve_space(xdr, len + 4);
3206                 if (!p)
3207                         return nfserr_resource;
3208                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3209         }
3210         return nfserr;
3211 }
3212
3213 /*
3214 * Including all fields other than the name, a LOCK4denied structure requires
3215 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3216 */
3217 static __be32
3218 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3219 {
3220         struct xdr_netobj *conf = &ld->ld_owner;
3221         __be32 *p;
3222
3223 again:
3224         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3225         if (!p) {
3226                 /*
3227                  * Don't fail to return the result just because we can't
3228                  * return the conflicting open:
3229                  */
3230                 if (conf->len) {
3231                         kfree(conf->data);
3232                         conf->len = 0;
3233                         conf->data = NULL;
3234                         goto again;
3235                 }
3236                 return nfserr_resource;
3237         }
3238         p = xdr_encode_hyper(p, ld->ld_start);
3239         p = xdr_encode_hyper(p, ld->ld_length);
3240         *p++ = cpu_to_be32(ld->ld_type);
3241         if (conf->len) {
3242                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3243                 p = xdr_encode_opaque(p, conf->data, conf->len);
3244                 kfree(conf->data);
3245         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3246                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3247                 *p++ = cpu_to_be32(0); /* length of owner name */
3248         }
3249         return nfserr_denied;
3250 }
3251
3252 static __be32
3253 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3254 {
3255         struct xdr_stream *xdr = &resp->xdr;
3256
3257         if (!nfserr)
3258                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3259         else if (nfserr == nfserr_denied)
3260                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3261
3262         return nfserr;
3263 }
3264
3265 static __be32
3266 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3267 {
3268         struct xdr_stream *xdr = &resp->xdr;
3269
3270         if (nfserr == nfserr_denied)
3271                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3272         return nfserr;
3273 }
3274
3275 static __be32
3276 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3277 {
3278         struct xdr_stream *xdr = &resp->xdr;
3279
3280         if (!nfserr)
3281                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3282
3283         return nfserr;
3284 }
3285
3286
3287 static __be32
3288 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3289 {
3290         struct xdr_stream *xdr = &resp->xdr;
3291         __be32 *p;
3292
3293         if (!nfserr) {
3294                 p = xdr_reserve_space(xdr, 20);
3295                 if (!p)
3296                         return nfserr_resource;
3297                 p = encode_cinfo(p, &link->li_cinfo);
3298         }
3299         return nfserr;
3300 }
3301
3302
3303 static __be32
3304 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3305 {
3306         struct xdr_stream *xdr = &resp->xdr;
3307         __be32 *p;
3308
3309         if (nfserr)
3310                 goto out;
3311
3312         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3313         if (nfserr)
3314                 goto out;
3315         p = xdr_reserve_space(xdr, 24);
3316         if (!p)
3317                 return nfserr_resource;
3318         p = encode_cinfo(p, &open->op_cinfo);
3319         *p++ = cpu_to_be32(open->op_rflags);
3320
3321         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3322                                         open->op_bmval[2]);
3323         if (nfserr)
3324                 goto out;
3325
3326         p = xdr_reserve_space(xdr, 4);
3327         if (!p)
3328                 return nfserr_resource;
3329
3330         *p++ = cpu_to_be32(open->op_delegate_type);
3331         switch (open->op_delegate_type) {
3332         case NFS4_OPEN_DELEGATE_NONE:
3333                 break;
3334         case NFS4_OPEN_DELEGATE_READ:
3335                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3336                 if (nfserr)
3337                         return nfserr;
3338                 p = xdr_reserve_space(xdr, 20);
3339                 if (!p)
3340                         return nfserr_resource;
3341                 *p++ = cpu_to_be32(open->op_recall);
3342
3343                 /*
3344                  * TODO: ACE's in delegations
3345                  */
3346                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3347                 *p++ = cpu_to_be32(0);
3348                 *p++ = cpu_to_be32(0);
3349                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3350                 break;
3351         case NFS4_OPEN_DELEGATE_WRITE:
3352                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3353                 if (nfserr)
3354                         return nfserr;
3355                 p = xdr_reserve_space(xdr, 32);
3356                 if (!p)
3357                         return nfserr_resource;
3358                 *p++ = cpu_to_be32(0);
3359
3360                 /*
3361                  * TODO: space_limit's in delegations
3362                  */
3363                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3364                 *p++ = cpu_to_be32(~(u32)0);
3365                 *p++ = cpu_to_be32(~(u32)0);
3366
3367                 /*
3368                  * TODO: ACE's in delegations
3369                  */
3370                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3371                 *p++ = cpu_to_be32(0);
3372                 *p++ = cpu_to_be32(0);
3373                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3374                 break;
3375         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3376                 switch (open->op_why_no_deleg) {
3377                 case WND4_CONTENTION:
3378                 case WND4_RESOURCE:
3379                         p = xdr_reserve_space(xdr, 8);
3380                         if (!p)
3381                                 return nfserr_resource;
3382                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3383                         /* deleg signaling not supported yet: */
3384                         *p++ = cpu_to_be32(0);
3385                         break;
3386                 default:
3387                         p = xdr_reserve_space(xdr, 4);
3388                         if (!p)
3389                                 return nfserr_resource;
3390                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3391                 }
3392                 break;
3393         default:
3394                 BUG();
3395         }
3396         /* XXX save filehandle here */
3397 out:
3398         return nfserr;
3399 }
3400
3401 static __be32
3402 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3403 {
3404         struct xdr_stream *xdr = &resp->xdr;
3405
3406         if (!nfserr)
3407                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3408
3409         return nfserr;
3410 }
3411
3412 static __be32
3413 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3414 {
3415         struct xdr_stream *xdr = &resp->xdr;
3416
3417         if (!nfserr)
3418                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3419
3420         return nfserr;
3421 }
3422
3423 static __be32 nfsd4_encode_splice_read(
3424                                 struct nfsd4_compoundres *resp,
3425                                 struct nfsd4_read *read,
3426                                 struct file *file, unsigned long maxcount)
3427 {
3428         struct xdr_stream *xdr = &resp->xdr;
3429         struct xdr_buf *buf = xdr->buf;
3430         u32 eof;
3431         long len;
3432         int space_left;
3433         __be32 nfserr;
3434         __be32 *p = xdr->p - 2;
3435
3436         /* Make sure there will be room for padding if needed */
3437         if (xdr->end - xdr->p < 1)
3438                 return nfserr_resource;
3439
3440         len = maxcount;
3441         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3442                                   read->rd_offset, &maxcount);
3443         if (nfserr) {
3444                 /*
3445                  * nfsd_splice_actor may have already messed with the
3446                  * page length; reset it so as not to confuse
3447                  * xdr_truncate_encode:
3448                  */
3449                 buf->page_len = 0;
3450                 return nfserr;
3451         }
3452
3453         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3454                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3455
3456         *(p++) = htonl(eof);
3457         *(p++) = htonl(maxcount);
3458
3459         buf->page_len = maxcount;
3460         buf->len += maxcount;
3461         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3462                                                         / PAGE_SIZE;
3463
3464         /* Use rest of head for padding and remaining ops: */
3465         buf->tail[0].iov_base = xdr->p;
3466         buf->tail[0].iov_len = 0;
3467         xdr->iov = buf->tail;
3468         if (maxcount&3) {
3469                 int pad = 4 - (maxcount&3);
3470
3471                 *(xdr->p++) = 0;
3472
3473                 buf->tail[0].iov_base += maxcount&3;
3474                 buf->tail[0].iov_len = pad;
3475                 buf->len += pad;
3476         }
3477
3478         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3479                                 buf->buflen - buf->len);
3480         buf->buflen = buf->len + space_left;
3481         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3482
3483         return 0;
3484 }
3485
3486 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3487                                  struct nfsd4_read *read,
3488                                  struct file *file, unsigned long maxcount)
3489 {
3490         struct xdr_stream *xdr = &resp->xdr;
3491         u32 eof;
3492         int v;
3493         int starting_len = xdr->buf->len - 8;
3494         long len;
3495         int thislen;
3496         __be32 nfserr;
3497         __be32 tmp;
3498         __be32 *p;
3499         u32 zzz = 0;
3500         int pad;
3501
3502         len = maxcount;
3503         v = 0;
3504
3505         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3506         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3507         WARN_ON_ONCE(!p);
3508         resp->rqstp->rq_vec[v].iov_base = p;
3509         resp->rqstp->rq_vec[v].iov_len = thislen;
3510         v++;
3511         len -= thislen;
3512
3513         while (len) {
3514                 thislen = min_t(long, len, PAGE_SIZE);
3515                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3516                 WARN_ON_ONCE(!p);
3517                 resp->rqstp->rq_vec[v].iov_base = p;
3518                 resp->rqstp->rq_vec[v].iov_len = thislen;
3519                 v++;
3520                 len -= thislen;
3521         }
3522         read->rd_vlen = v;
3523
3524         len = maxcount;
3525         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3526                         read->rd_vlen, &maxcount);
3527         if (nfserr)
3528                 return nfserr;
3529         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3530
3531         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3532                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3533
3534         tmp = htonl(eof);
3535         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3536         tmp = htonl(maxcount);
3537         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3538
3539         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3540         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3541                                                                 &zzz, pad);
3542         return 0;
3543
3544 }
3545
3546 static __be32
3547 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3548                   struct nfsd4_read *read)
3549 {
3550         unsigned long maxcount;
3551         struct xdr_stream *xdr = &resp->xdr;
3552         struct file *file = read->rd_filp;
3553         int starting_len = xdr->buf->len;
3554         struct raparms *ra = NULL;
3555         __be32 *p;
3556
3557         if (nfserr)
3558                 goto out;
3559
3560         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3561         if (!p) {
3562                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3563                 nfserr = nfserr_resource;
3564                 goto out;
3565         }
3566         if (resp->xdr.buf->page_len &&
3567             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3568                 WARN_ON_ONCE(1);
3569                 nfserr = nfserr_resource;
3570                 goto out;
3571         }
3572         xdr_commit_encode(xdr);
3573
3574         maxcount = svc_max_payload(resp->rqstp);
3575         maxcount = min_t(unsigned long, maxcount,
3576                          (xdr->buf->buflen - xdr->buf->len));
3577         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3578
3579         if (read->rd_tmp_file)
3580                 ra = nfsd_init_raparms(file);
3581
3582         if (file->f_op->splice_read &&
3583             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3584                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3585         else
3586                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3587
3588         if (ra)
3589                 nfsd_put_raparams(file, ra);
3590
3591         if (nfserr)
3592                 xdr_truncate_encode(xdr, starting_len);
3593
3594 out:
3595         if (file)
3596                 fput(file);
3597         return nfserr;
3598 }
3599
3600 static __be32
3601 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3602 {
3603         int maxcount;
3604         __be32 wire_count;
3605         int zero = 0;
3606         struct xdr_stream *xdr = &resp->xdr;
3607         int length_offset = xdr->buf->len;
3608         __be32 *p;
3609
3610         if (nfserr)
3611                 return nfserr;
3612
3613         p = xdr_reserve_space(xdr, 4);
3614         if (!p)
3615                 return nfserr_resource;
3616         maxcount = PAGE_SIZE;
3617
3618         p = xdr_reserve_space(xdr, maxcount);
3619         if (!p)
3620                 return nfserr_resource;
3621         /*
3622          * XXX: By default, vfs_readlink() will truncate symlinks if they
3623          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
3624          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3625          * that truncation occurred, and return NFS4ERR_RESOURCE.
3626          */
3627         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3628                                                 (char *)p, &maxcount);
3629         if (nfserr == nfserr_isdir)
3630                 nfserr = nfserr_inval;
3631         if (nfserr) {
3632                 xdr_truncate_encode(xdr, length_offset);
3633                 return nfserr;
3634         }
3635
3636         wire_count = htonl(maxcount);
3637         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3638         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3639         if (maxcount & 3)
3640                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3641                                                 &zero, 4 - (maxcount&3));
3642         return 0;
3643 }
3644
3645 static __be32
3646 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3647 {
3648         int maxcount;
3649         int bytes_left;
3650         loff_t offset;
3651         __be64 wire_offset;
3652         struct xdr_stream *xdr = &resp->xdr;
3653         int starting_len = xdr->buf->len;
3654         __be32 *p;
3655
3656         if (nfserr)
3657                 return nfserr;
3658
3659         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3660         if (!p)
3661                 return nfserr_resource;
3662
3663         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3664         *p++ = cpu_to_be32(0);
3665         *p++ = cpu_to_be32(0);
3666         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3667                                 - (char *)resp->xdr.buf->head[0].iov_base;
3668
3669         /*
3670          * Number of bytes left for directory entries allowing for the
3671          * final 8 bytes of the readdir and a following failed op:
3672          */
3673         bytes_left = xdr->buf->buflen - xdr->buf->len
3674                         - COMPOUND_ERR_SLACK_SPACE - 8;
3675         if (bytes_left < 0) {
3676                 nfserr = nfserr_resource;
3677                 goto err_no_verf;
3678         }
3679         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3680         /*
3681          * Note the rfc defines rd_maxcount as the size of the
3682          * READDIR4resok structure, which includes the verifier above
3683          * and the 8 bytes encoded at the end of this function:
3684          */
3685         if (maxcount < 16) {
3686                 nfserr = nfserr_toosmall;
3687                 goto err_no_verf;
3688         }
3689         maxcount = min_t(int, maxcount-16, bytes_left);
3690
3691         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3692         if (!readdir->rd_dircount)
3693                 readdir->rd_dircount = INT_MAX;
3694
3695         readdir->xdr = xdr;
3696         readdir->rd_maxcount = maxcount;
3697         readdir->common.err = 0;
3698         readdir->cookie_offset = 0;
3699
3700         offset = readdir->rd_cookie;
3701         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3702                               &offset,
3703                               &readdir->common, nfsd4_encode_dirent);
3704         if (nfserr == nfs_ok &&
3705             readdir->common.err == nfserr_toosmall &&
3706             xdr->buf->len == starting_len + 8) {
3707                 /* nothing encoded; which limit did we hit?: */
3708                 if (maxcount - 16 < bytes_left)
3709                         /* It was the fault of rd_maxcount: */
3710                         nfserr = nfserr_toosmall;
3711                 else
3712                         /* We ran out of buffer space: */
3713                         nfserr = nfserr_resource;
3714         }
3715         if (nfserr)
3716                 goto err_no_verf;
3717
3718         if (readdir->cookie_offset) {
3719                 wire_offset = cpu_to_be64(offset);
3720                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3721                                                         &wire_offset, 8);
3722         }
3723
3724         p = xdr_reserve_space(xdr, 8);
3725         if (!p) {
3726                 WARN_ON_ONCE(1);
3727                 goto err_no_verf;
3728         }
3729         *p++ = 0;       /* no more entries */
3730         *p++ = htonl(readdir->common.err == nfserr_eof);
3731
3732         return 0;
3733 err_no_verf:
3734         xdr_truncate_encode(xdr, starting_len);
3735         return nfserr;
3736 }
3737
3738 static __be32
3739 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3740 {
3741         struct xdr_stream *xdr = &resp->xdr;
3742         __be32 *p;
3743
3744         if (!nfserr) {
3745                 p = xdr_reserve_space(xdr, 20);
3746                 if (!p)
3747                         return nfserr_resource;
3748                 p = encode_cinfo(p, &remove->rm_cinfo);
3749         }
3750         return nfserr;
3751 }
3752
3753 static __be32
3754 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3755 {
3756         struct xdr_stream *xdr = &resp->xdr;
3757         __be32 *p;
3758
3759         if (!nfserr) {
3760                 p = xdr_reserve_space(xdr, 40);
3761                 if (!p)
3762                         return nfserr_resource;
3763                 p = encode_cinfo(p, &rename->rn_sinfo);
3764                 p = encode_cinfo(p, &rename->rn_tinfo);
3765         }
3766         return nfserr;
3767 }
3768
3769 static __be32
3770 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3771                          __be32 nfserr, struct svc_export *exp)
3772 {
3773         u32 i, nflavs, supported;
3774         struct exp_flavor_info *flavs;
3775         struct exp_flavor_info def_flavs[2];
3776         __be32 *p, *flavorsp;
3777         static bool report = true;
3778
3779         if (nfserr)
3780                 goto out;
3781         nfserr = nfserr_resource;
3782         if (exp->ex_nflavors) {
3783                 flavs = exp->ex_flavors;
3784                 nflavs = exp->ex_nflavors;
3785         } else { /* Handling of some defaults in absence of real secinfo: */
3786                 flavs = def_flavs;
3787                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3788                         nflavs = 2;
3789                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3790                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3791                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3792                         nflavs = 1;
3793                         flavs[0].pseudoflavor
3794                                         = svcauth_gss_flavor(exp->ex_client);
3795                 } else {
3796                         nflavs = 1;
3797                         flavs[0].pseudoflavor
3798                                         = exp->ex_client->flavour->flavour;
3799                 }
3800         }
3801
3802         supported = 0;
3803         p = xdr_reserve_space(xdr, 4);
3804         if (!p)
3805                 goto out;
3806         flavorsp = p++;         /* to be backfilled later */
3807
3808         for (i = 0; i < nflavs; i++) {
3809                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3810                 struct rpcsec_gss_info info;
3811
3812                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3813                         supported++;
3814                         p = xdr_reserve_space(xdr, 4 + 4 +
3815                                               XDR_LEN(info.oid.len) + 4 + 4);
3816                         if (!p)
3817                                 goto out;
3818                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3819                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3820                         *p++ = cpu_to_be32(info.qop);
3821                         *p++ = cpu_to_be32(info.service);
3822                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3823                         supported++;
3824                         p = xdr_reserve_space(xdr, 4);
3825                         if (!p)
3826                                 goto out;
3827                         *p++ = cpu_to_be32(pf);
3828                 } else {
3829                         if (report)
3830                                 pr_warn("NFS: SECINFO: security flavor %u "
3831                                         "is not supported\n", pf);
3832                 }
3833         }
3834
3835         if (nflavs != supported)
3836                 report = false;
3837         *flavorsp = htonl(supported);
3838         nfserr = 0;
3839 out:
3840         if (exp)
3841                 exp_put(exp);
3842         return nfserr;
3843 }
3844
3845 static __be32
3846 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3847                      struct nfsd4_secinfo *secinfo)
3848 {
3849         struct xdr_stream *xdr = &resp->xdr;
3850
3851         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3852 }
3853
3854 static __be32
3855 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3856                      struct nfsd4_secinfo_no_name *secinfo)
3857 {
3858         struct xdr_stream *xdr = &resp->xdr;
3859
3860         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3861 }
3862
3863 /*
3864  * The SETATTR encode routine is special -- it always encodes a bitmap,
3865  * regardless of the error status.
3866  */
3867 static __be32
3868 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3869 {
3870         struct xdr_stream *xdr = &resp->xdr;
3871         __be32 *p;
3872
3873         p = xdr_reserve_space(xdr, 16);
3874         if (!p)
3875                 return nfserr_resource;
3876         if (nfserr) {
3877                 *p++ = cpu_to_be32(3);
3878                 *p++ = cpu_to_be32(0);
3879                 *p++ = cpu_to_be32(0);
3880                 *p++ = cpu_to_be32(0);
3881         }
3882         else {
3883                 *p++ = cpu_to_be32(3);
3884                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3885                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3886                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3887         }
3888         return nfserr;
3889 }
3890
3891 static __be32
3892 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3893 {
3894         struct xdr_stream *xdr = &resp->xdr;
3895         __be32 *p;
3896
3897         if (!nfserr) {
3898                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3899                 if (!p)
3900                         return nfserr_resource;
3901                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3902                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3903                                                 NFS4_VERIFIER_SIZE);
3904         }
3905         else if (nfserr == nfserr_clid_inuse) {
3906                 p = xdr_reserve_space(xdr, 8);
3907                 if (!p)
3908                         return nfserr_resource;
3909                 *p++ = cpu_to_be32(0);
3910                 *p++ = cpu_to_be32(0);
3911         }
3912         return nfserr;
3913 }
3914
3915 static __be32
3916 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3917 {
3918         struct xdr_stream *xdr = &resp->xdr;
3919         __be32 *p;
3920
3921         if (!nfserr) {
3922                 p = xdr_reserve_space(xdr, 16);
3923                 if (!p)
3924                         return nfserr_resource;
3925                 *p++ = cpu_to_be32(write->wr_bytes_written);
3926                 *p++ = cpu_to_be32(write->wr_how_written);
3927                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3928                                                         NFS4_VERIFIER_SIZE);
3929         }
3930         return nfserr;
3931 }
3932
3933 static __be32
3934 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3935                          struct nfsd4_exchange_id *exid)
3936 {
3937         struct xdr_stream *xdr = &resp->xdr;
3938         __be32 *p;
3939         char *major_id;
3940         char *server_scope;
3941         int major_id_sz;
3942         int server_scope_sz;
3943         int status = 0;
3944         uint64_t minor_id = 0;
3945
3946         if (nfserr)
3947                 return nfserr;
3948
3949         major_id = utsname()->nodename;
3950         major_id_sz = strlen(major_id);
3951         server_scope = utsname()->nodename;
3952         server_scope_sz = strlen(server_scope);
3953
3954         p = xdr_reserve_space(xdr,
3955                 8 /* eir_clientid */ +
3956                 4 /* eir_sequenceid */ +
3957                 4 /* eir_flags */ +
3958                 4 /* spr_how */);
3959         if (!p)
3960                 return nfserr_resource;
3961
3962         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3963         *p++ = cpu_to_be32(exid->seqid);
3964         *p++ = cpu_to_be32(exid->flags);
3965
3966         *p++ = cpu_to_be32(exid->spa_how);
3967
3968         switch (exid->spa_how) {
3969         case SP4_NONE:
3970                 break;
3971         case SP4_MACH_CRED:
3972                 /* spo_must_enforce bitmap: */
3973                 status = nfsd4_encode_bitmap(xdr,
3974                                         exid->spo_must_enforce[0],
3975                                         exid->spo_must_enforce[1],
3976                                         exid->spo_must_enforce[2]);
3977                 if (status)
3978                         goto out;
3979                 /* spo_must_allow bitmap: */
3980                 status = nfsd4_encode_bitmap(xdr,
3981                                         exid->spo_must_allow[0],
3982                                         exid->spo_must_allow[1],
3983                                         exid->spo_must_allow[2]);
3984                 if (status)
3985                         goto out;
3986                 break;
3987         default:
3988                 WARN_ON_ONCE(1);
3989         }
3990
3991         p = xdr_reserve_space(xdr,
3992                 8 /* so_minor_id */ +
3993                 4 /* so_major_id.len */ +
3994                 (XDR_QUADLEN(major_id_sz) * 4) +
3995                 4 /* eir_server_scope.len */ +
3996                 (XDR_QUADLEN(server_scope_sz) * 4) +
3997                 4 /* eir_server_impl_id.count (0) */);
3998         if (!p)
3999                 return nfserr_resource;
4000
4001         /* The server_owner struct */
4002         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
4003         /* major id */
4004         p = xdr_encode_opaque(p, major_id, major_id_sz);
4005
4006         /* Server scope */
4007         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4008
4009         /* Implementation id */
4010         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
4011         return 0;
4012 out:
4013         return status;
4014 }
4015
4016 static __be32
4017 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4018                             struct nfsd4_create_session *sess)
4019 {
4020         struct xdr_stream *xdr = &resp->xdr;
4021         __be32 *p;
4022
4023         if (nfserr)
4024                 return nfserr;
4025
4026         p = xdr_reserve_space(xdr, 24);
4027         if (!p)
4028                 return nfserr_resource;
4029         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4030                                         NFS4_MAX_SESSIONID_LEN);
4031         *p++ = cpu_to_be32(sess->seqid);
4032         *p++ = cpu_to_be32(sess->flags);
4033
4034         p = xdr_reserve_space(xdr, 28);
4035         if (!p)
4036                 return nfserr_resource;
4037         *p++ = cpu_to_be32(0); /* headerpadsz */
4038         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4039         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4040         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4041         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4042         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4043         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4044
4045         if (sess->fore_channel.nr_rdma_attrs) {
4046                 p = xdr_reserve_space(xdr, 4);
4047                 if (!p)
4048                         return nfserr_resource;
4049                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4050         }
4051
4052         p = xdr_reserve_space(xdr, 28);
4053         if (!p)
4054                 return nfserr_resource;
4055         *p++ = cpu_to_be32(0); /* headerpadsz */
4056         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4057         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4058         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4059         *p++ = cpu_to_be32(sess->back_channel.maxops);
4060         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4061         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4062
4063         if (sess->back_channel.nr_rdma_attrs) {
4064                 p = xdr_reserve_space(xdr, 4);
4065                 if (!p)
4066                         return nfserr_resource;
4067                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4068         }
4069         return 0;
4070 }
4071
4072 static __be32
4073 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4074                       struct nfsd4_sequence *seq)
4075 {
4076         struct xdr_stream *xdr = &resp->xdr;
4077         __be32 *p;
4078
4079         if (nfserr)
4080                 return nfserr;
4081
4082         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4083         if (!p)
4084                 return nfserr_resource;
4085         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4086                                         NFS4_MAX_SESSIONID_LEN);
4087         *p++ = cpu_to_be32(seq->seqid);
4088         *p++ = cpu_to_be32(seq->slotid);
4089         /* Note slotid's are numbered from zero: */
4090         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4091         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4092         *p++ = cpu_to_be32(seq->status_flags);
4093
4094         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4095         return 0;
4096 }
4097
4098 static __be32
4099 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4100                           struct nfsd4_test_stateid *test_stateid)
4101 {
4102         struct xdr_stream *xdr = &resp->xdr;
4103         struct nfsd4_test_stateid_id *stateid, *next;
4104         __be32 *p;
4105
4106         if (nfserr)
4107                 return nfserr;
4108
4109         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4110         if (!p)
4111                 return nfserr_resource;
4112         *p++ = htonl(test_stateid->ts_num_ids);
4113
4114         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4115                 *p++ = stateid->ts_id_status;
4116         }
4117
4118         return nfserr;
4119 }
4120
4121 #ifdef CONFIG_NFSD_PNFS
4122 static __be32
4123 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4124                 struct nfsd4_getdeviceinfo *gdev)
4125 {
4126         struct xdr_stream *xdr = &resp->xdr;
4127         const struct nfsd4_layout_ops *ops;
4128         u32 starting_len = xdr->buf->len, needed_len;
4129         __be32 *p;
4130
4131         dprintk("%s: err %d\n", __func__, be32_to_cpu(nfserr));
4132         if (nfserr)
4133                 goto out;
4134
4135         nfserr = nfserr_resource;
4136         p = xdr_reserve_space(xdr, 4);
4137         if (!p)
4138                 goto out;
4139
4140         *p++ = cpu_to_be32(gdev->gd_layout_type);
4141
4142         /* If maxcount is 0 then just update notifications */
4143         if (gdev->gd_maxcount != 0) {
4144                 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4145                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4146                 if (nfserr) {
4147                         /*
4148                          * We don't bother to burden the layout drivers with
4149                          * enforcing gd_maxcount, just tell the client to
4150                          * come back with a bigger buffer if it's not enough.
4151                          */
4152                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4153                                 goto toosmall;
4154                         goto out;
4155                 }
4156         }
4157
4158         nfserr = nfserr_resource;
4159         if (gdev->gd_notify_types) {
4160                 p = xdr_reserve_space(xdr, 4 + 4);
4161                 if (!p)
4162                         goto out;
4163                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4164                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4165         } else {
4166                 p = xdr_reserve_space(xdr, 4);
4167                 if (!p)
4168                         goto out;
4169                 *p++ = 0;
4170         }
4171
4172         nfserr = 0;
4173 out:
4174         kfree(gdev->gd_device);
4175         dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4176         return nfserr;
4177
4178 toosmall:
4179         dprintk("%s: maxcount too small\n", __func__);
4180         needed_len = xdr->buf->len + 4 /* notifications */;
4181         xdr_truncate_encode(xdr, starting_len);
4182         p = xdr_reserve_space(xdr, 4);
4183         if (!p) {
4184                 nfserr = nfserr_resource;
4185         } else {
4186                 *p++ = cpu_to_be32(needed_len);
4187                 nfserr = nfserr_toosmall;
4188         }
4189         goto out;
4190 }
4191
4192 static __be32
4193 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4194                 struct nfsd4_layoutget *lgp)
4195 {
4196         struct xdr_stream *xdr = &resp->xdr;
4197         const struct nfsd4_layout_ops *ops;
4198         __be32 *p;
4199
4200         dprintk("%s: err %d\n", __func__, nfserr);
4201         if (nfserr)
4202                 goto out;
4203
4204         nfserr = nfserr_resource;
4205         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4206         if (!p)
4207                 goto out;
4208
4209         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4210         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4211         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4212                                     sizeof(stateid_opaque_t));
4213
4214         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4215         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4216         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4217         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4218         *p++ = cpu_to_be32(lgp->lg_layout_type);
4219
4220         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4221         nfserr = ops->encode_layoutget(xdr, lgp);
4222 out:
4223         kfree(lgp->lg_content);
4224         return nfserr;
4225 }
4226
4227 static __be32
4228 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4229                           struct nfsd4_layoutcommit *lcp)
4230 {
4231         struct xdr_stream *xdr = &resp->xdr;
4232         __be32 *p;
4233
4234         if (nfserr)
4235                 return nfserr;
4236
4237         p = xdr_reserve_space(xdr, 4);
4238         if (!p)
4239                 return nfserr_resource;
4240         *p++ = cpu_to_be32(lcp->lc_size_chg);
4241         if (lcp->lc_size_chg) {
4242                 p = xdr_reserve_space(xdr, 8);
4243                 if (!p)
4244                         return nfserr_resource;
4245                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4246         }
4247
4248         return nfs_ok;
4249 }
4250
4251 static __be32
4252 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4253                 struct nfsd4_layoutreturn *lrp)
4254 {
4255         struct xdr_stream *xdr = &resp->xdr;
4256         __be32 *p;
4257
4258         if (nfserr)
4259                 return nfserr;
4260
4261         p = xdr_reserve_space(xdr, 4);
4262         if (!p)
4263                 return nfserr_resource;
4264         *p++ = cpu_to_be32(lrp->lrs_present);
4265         if (lrp->lrs_present)
4266                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4267         return nfs_ok;
4268 }
4269 #endif /* CONFIG_NFSD_PNFS */
4270
4271 static __be32
4272 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4273 {
4274         __be32 *p;
4275
4276         p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4277         if (!p)
4278                 return nfserr_resource;
4279
4280         *p++ = cpu_to_be32(0);
4281         p = xdr_encode_hyper(p, write->wr_bytes_written);
4282         *p++ = cpu_to_be32(write->wr_stable_how);
4283         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4284                                     NFS4_VERIFIER_SIZE);
4285         return nfs_ok;
4286 }
4287
4288 static __be32
4289 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4290                   struct nfsd4_copy *copy)
4291 {
4292         __be32 *p;
4293
4294         if (!nfserr) {
4295                 nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
4296                 if (nfserr)
4297                         return nfserr;
4298
4299                 p = xdr_reserve_space(&resp->xdr, 4 + 4);
4300                 *p++ = cpu_to_be32(copy->cp_consecutive);
4301                 *p++ = cpu_to_be32(copy->cp_synchronous);
4302         }
4303         return nfserr;
4304 }
4305
4306 static __be32
4307 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4308                   struct nfsd4_seek *seek)
4309 {
4310         __be32 *p;
4311
4312         if (nfserr)
4313                 return nfserr;
4314
4315         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4316         *p++ = cpu_to_be32(seek->seek_eof);
4317         p = xdr_encode_hyper(p, seek->seek_pos);
4318
4319         return nfserr;
4320 }
4321
4322 static __be32
4323 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4324 {
4325         return nfserr;
4326 }
4327
4328 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4329
4330 /*
4331  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4332  * since we don't need to filter out obsolete ops as this is
4333  * done in the decoding phase.
4334  */
4335 static nfsd4_enc nfsd4_enc_ops[] = {
4336         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4337         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4338         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4339         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4340         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4341         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4342         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4343         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4344         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4345         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4346         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4347         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4348         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4349         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4350         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4351         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4352         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4353         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4354         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4355         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4356         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4357         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4358         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4359         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4360         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4361         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4362         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4363         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4364         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4365         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4366         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4367         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4368         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4369         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4370         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4371         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4372         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4373
4374         /* NFSv4.1 operations */
4375         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4376         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4377         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4378         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4379         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4380         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4381         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4382 #ifdef CONFIG_NFSD_PNFS
4383         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4384         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4385         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4386         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4387         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4388 #else
4389         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4390         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4391         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4392         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4393         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4394 #endif
4395         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4396         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4397         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4398         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4399         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4400         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4401         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4402
4403         /* NFSv4.2 operations */
4404         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4405         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
4406         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4407         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4408         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4409         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4410         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4411         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4412         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4413         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4414         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4415         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4416         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4417 };
4418
4419 /*
4420  * Calculate whether we still have space to encode repsize bytes.
4421  * There are two considerations:
4422  *     - For NFS versions >=4.1, the size of the reply must stay within
4423  *       session limits
4424  *     - For all NFS versions, we must stay within limited preallocated
4425  *       buffer space.
4426  *
4427  * This is called before the operation is processed, so can only provide
4428  * an upper estimate.  For some nonidempotent operations (such as
4429  * getattr), it's not necessarily a problem if that estimate is wrong,
4430  * as we can fail it after processing without significant side effects.
4431  */
4432 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4433 {
4434         struct xdr_buf *buf = &resp->rqstp->rq_res;
4435         struct nfsd4_slot *slot = resp->cstate.slot;
4436
4437         if (buf->len + respsize <= buf->buflen)
4438                 return nfs_ok;
4439         if (!nfsd4_has_session(&resp->cstate))
4440                 return nfserr_resource;
4441         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4442                 WARN_ON_ONCE(1);
4443                 return nfserr_rep_too_big_to_cache;
4444         }
4445         return nfserr_rep_too_big;
4446 }
4447
4448 void
4449 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4450 {
4451         struct xdr_stream *xdr = &resp->xdr;
4452         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4453         struct svc_rqst *rqstp = resp->rqstp;
4454         int post_err_offset;
4455         nfsd4_enc encoder;
4456         __be32 *p;
4457
4458         p = xdr_reserve_space(xdr, 8);
4459         if (!p) {
4460                 WARN_ON_ONCE(1);
4461                 return;
4462         }
4463         *p++ = cpu_to_be32(op->opnum);
4464         post_err_offset = xdr->buf->len;
4465
4466         if (op->opnum == OP_ILLEGAL)
4467                 goto status;
4468         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4469                !nfsd4_enc_ops[op->opnum]);
4470         encoder = nfsd4_enc_ops[op->opnum];
4471         op->status = encoder(resp, op->status, &op->u);
4472         xdr_commit_encode(xdr);
4473
4474         /* nfsd4_check_resp_size guarantees enough room for error status */
4475         if (!op->status) {
4476                 int space_needed = 0;
4477                 if (!nfsd4_last_compound_op(rqstp))
4478                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4479                 op->status = nfsd4_check_resp_size(resp, space_needed);
4480         }
4481         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4482                 struct nfsd4_slot *slot = resp->cstate.slot;
4483
4484                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4485                         op->status = nfserr_rep_too_big_to_cache;
4486                 else
4487                         op->status = nfserr_rep_too_big;
4488         }
4489         if (op->status == nfserr_resource ||
4490             op->status == nfserr_rep_too_big ||
4491             op->status == nfserr_rep_too_big_to_cache) {
4492                 /*
4493                  * The operation may have already been encoded or
4494                  * partially encoded.  No op returns anything additional
4495                  * in the case of one of these three errors, so we can
4496                  * just truncate back to after the status.  But it's a
4497                  * bug if we had to do this on a non-idempotent op:
4498                  */
4499                 warn_on_nonidempotent_op(op);
4500                 xdr_truncate_encode(xdr, post_err_offset);
4501         }
4502         if (so) {
4503                 int len = xdr->buf->len - post_err_offset;
4504
4505                 so->so_replay.rp_status = op->status;
4506                 so->so_replay.rp_buflen = len;
4507                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4508                                                 so->so_replay.rp_buf, len);
4509         }
4510 status:
4511         /* Note that op->status is already in network byte order: */
4512         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4513 }
4514
4515 /*
4516  * Encode the reply stored in the stateowner reply cache
4517  *
4518  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4519  * previously sent already encoded operation.
4520  */
4521 void
4522 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4523 {
4524         __be32 *p;
4525         struct nfs4_replay *rp = op->replay;
4526
4527         BUG_ON(!rp);
4528
4529         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4530         if (!p) {
4531                 WARN_ON_ONCE(1);
4532                 return;
4533         }
4534         *p++ = cpu_to_be32(op->opnum);
4535         *p++ = rp->rp_status;  /* already xdr'ed */
4536
4537         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4538 }
4539
4540 int
4541 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4542 {
4543         return xdr_ressize_check(rqstp, p);
4544 }
4545
4546 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4547 {
4548         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4549
4550         if (args->ops != args->iops) {
4551                 kfree(args->ops);
4552                 args->ops = args->iops;
4553         }
4554         kfree(args->tmpp);
4555         args->tmpp = NULL;
4556         while (args->to_free) {
4557                 struct svcxdr_tmpbuf *tb = args->to_free;
4558                 args->to_free = tb->next;
4559                 kfree(tb);
4560         }
4561 }
4562
4563 int
4564 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4565 {
4566         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4567
4568         if (rqstp->rq_arg.head[0].iov_len % 4) {
4569                 /* client is nuts */
4570                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4571                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4572                 return 0;
4573         }
4574         args->p = p;
4575         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4576         args->pagelist = rqstp->rq_arg.pages;
4577         args->pagelen = rqstp->rq_arg.page_len;
4578         args->tmpp = NULL;
4579         args->to_free = NULL;
4580         args->ops = args->iops;
4581         args->rqstp = rqstp;
4582
4583         return !nfsd4_decode_compound(args);
4584 }
4585
4586 int
4587 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4588 {
4589         /*
4590          * All that remains is to write the tag and operation count...
4591          */
4592         struct nfsd4_compoundres *resp = rqstp->rq_resp;
4593         struct xdr_buf *buf = resp->xdr.buf;
4594
4595         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4596                                  buf->tail[0].iov_len);
4597
4598         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4599
4600         p = resp->tagp;
4601         *p++ = htonl(resp->taglen);
4602         memcpy(p, resp->tag, resp->taglen);
4603         p += XDR_QUADLEN(resp->taglen);
4604         *p++ = htonl(resp->opcnt);
4605
4606         nfsd4_sequence_done(resp);
4607         return 1;
4608 }
4609
4610 /*
4611  * Local variables:
4612  *  c-basic-offset: 8
4613  * End:
4614  */