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/slab.h>
  37 #include <linux/namei.h>
  38 #include <linux/statfs.h>
  39 #include <linux/utsname.h>
  40 #include <linux/pagemap.h>
  41 #include <linux/sunrpc/svcauth_gss.h>
  42
  43 #include "idmap.h"
  44 #include "acl.h"
  45 #include "xdr4.h"
  46 #include "vfs.h"
  47 #include "state.h"
  48 #include "cache.h"
  49 #include "netns.h"
  50
  51 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  52 #include <linux/security.h>
  53 #endif
  54
  55
  56 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  57
  58 /*
  59  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  60  * directory in order to indicate to the client that a filesystem boundary is present
  61  * We use a fixed fsid for a referral
  62  */
  63 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  64 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  65
  66 static __be32
  67 check_filename(char *str, int len)
  68 {
  69         int i;
  70
  71         if (len == 0)
  72                 return nfserr_inval;
  73         if (isdotent(str, len))
  74                 return nfserr_badname;
  75         for (i = 0; i < len; i++)
  76                 if (str[i] == '/')
  77                         return nfserr_badname;
  78         return 0;
  79 }
  80
  81 #define DECODE_HEAD                             \
  82         __be32 *p;                              \
  83         __be32 status
  84 #define DECODE_TAIL                             \
  85         status = 0;                             \
  86 out:                                            \
  87         return status;                          \
  88 xdr_error:                                      \
  89         dprintk("NFSD: xdr error (%s:%d)\n",    \
  90                         __FILE__, __LINE__);    \
  91         status = nfserr_bad_xdr;                \
  92         goto out
  93
  94 #define READMEM(x,nbytes) do {                  \
  95         x = (char *)p;                          \
  96         p += XDR_QUADLEN(nbytes);               \
  97 } while (0)
  98 #define SAVEMEM(x,nbytes) do {                  \
  99         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 100                 savemem(argp, p, nbytes) :      \
 101                 (char *)p)) {                   \
 102                 dprintk("NFSD: xdr error (%s:%d)\n", \
 103                                 __FILE__, __LINE__); \
 104                 goto xdr_error;                 \
 105                 }                               \
 106         p += XDR_QUADLEN(nbytes);               \
 107 } while (0)
 108 #define COPYMEM(x,nbytes) do {                  \
 109         memcpy((x), p, nbytes);                 \
 110         p += XDR_QUADLEN(nbytes);               \
 111 } while (0)
 112
 113 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 114 #define READ_BUF(nbytes)  do {                  \
 115         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 116                 p = argp->p;                    \
 117                 argp->p += XDR_QUADLEN(nbytes); \
 118         } else if (!(p = read_buf(argp, nbytes))) { \
 119                 dprintk("NFSD: xdr error (%s:%d)\n", \
 120                                 __FILE__, __LINE__); \
 121                 goto xdr_error;                 \
 122         }                                       \
 123 } while (0)
 124
 125 static void next_decode_page(struct nfsd4_compoundargs *argp)
 126 {
 127         argp->p = page_address(argp->pagelist[0]);
 128         argp->pagelist++;
 129         if (argp->pagelen < PAGE_SIZE) {
 130                 argp->end = argp->p + (argp->pagelen>>2);
 131                 argp->pagelen = 0;
 132         } else {
 133                 argp->end = argp->p + (PAGE_SIZE>>2);
 134                 argp->pagelen -= PAGE_SIZE;
 135         }
 136 }
 137
 138 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 139 {
 140         /* We want more bytes than seem to be available.
 141          * Maybe we need a new page, maybe we have just run out
 142          */
 143         unsigned int avail = (char *)argp->end - (char *)argp->p;
 144         __be32 *p;
 145         if (avail + argp->pagelen < nbytes)
 146                 return NULL;
 147         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 148                 return NULL;
 149         /* ok, we can do it with the current plus the next page */
 150         if (nbytes <= sizeof(argp->tmp))
 151                 p = argp->tmp;
 152         else {
 153                 kfree(argp->tmpp);
 154                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 155                 if (!p)
 156                         return NULL;
 157
 158         }
 159         /*
 160          * The following memcpy is safe because read_buf is always
 161          * called with nbytes > avail, and the two cases above both
 162          * guarantee p points to at least nbytes bytes.
 163          */
 164         memcpy(p, argp->p, avail);
 165         next_decode_page(argp);
 166         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 167         argp->p += XDR_QUADLEN(nbytes - avail);
 168         return p;
 169 }
 170
 171 static int zero_clientid(clientid_t *clid)
 172 {
 173         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 174 }
 175
 176 /**
 177  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 178  * @argp: NFSv4 compound argument structure
 179  * @p: pointer to be freed (with kfree())
 180  *
 181  * Marks @p to be freed when processing the compound operation
 182  * described in @argp finishes.
 183  */
 184 static void *
 185 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 186 {
 187         struct svcxdr_tmpbuf *tb;
 188
 189         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 190         if (!tb)
 191                 return NULL;
 192         tb->next = argp->to_free;
 193         argp->to_free = tb;
 194         return tb->buf;
 195 }
 196
 197 /*
 198  * For xdr strings that need to be passed to other kernel api's
 199  * as null-terminated strings.
 200  *
 201  * Note null-terminating in place usually isn't safe since the
 202  * buffer might end on a page boundary.
 203  */
 204 static char *
 205 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 206 {
 207         char *p = svcxdr_tmpalloc(argp, len + 1);
 208
 209         if (!p)
 210                 return NULL;
 211         memcpy(p, buf, len);
 212         p[len] = '\0';
 213         return p;
 214 }
 215
 216 /**
 217  * savemem - duplicate a chunk of memory for later processing
 218  * @argp: NFSv4 compound argument structure to be freed with
 219  * @p: pointer to be duplicated
 220  * @nbytes: length to be duplicated
 221  *
 222  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 223  * that are preserved until processing of the NFSv4 compound
 224  * operation described by @argp finishes.
 225  */
 226 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 227 {
 228         void *ret;
 229
 230         ret = svcxdr_tmpalloc(argp, nbytes);
 231         if (!ret)
 232                 return NULL;
 233         memcpy(ret, p, nbytes);
 234         return ret;
 235 }
 236
 237 static __be32
 238 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 239 {
 240         u32 bmlen;
 241         DECODE_HEAD;
 242
 243         bmval[0] = 0;
 244         bmval[1] = 0;
 245         bmval[2] = 0;
 246
 247         READ_BUF(4);
 248         bmlen = be32_to_cpup(p++);
 249         if (bmlen > 1000)
 250                 goto xdr_error;
 251
 252         READ_BUF(bmlen << 2);
 253         if (bmlen > 0)
 254                 bmval[0] = be32_to_cpup(p++);
 255         if (bmlen > 1)
 256                 bmval[1] = be32_to_cpup(p++);
 257         if (bmlen > 2)
 258                 bmval[2] = be32_to_cpup(p++);
 259
 260         DECODE_TAIL;
 261 }
 262
 263 static __be32
 264 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 265                    struct iattr *iattr, struct nfs4_acl **acl,
 266                    struct xdr_netobj *label)
 267 {
 268         int expected_len, len = 0;
 269         u32 dummy32;
 270         u64 sec;
 271         char *buf;
 272
 273         DECODE_HEAD;
 274         iattr->ia_valid = 0;
 275         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 276                 return status;
 277
 278         READ_BUF(4);
 279         expected_len = be32_to_cpup(p++);
 280
 281         if (bmval[0] & FATTR4_WORD0_SIZE) {
 282                 READ_BUF(8);
 283                 len += 8;
 284                 p = xdr_decode_hyper(p, &iattr->ia_size);
 285                 iattr->ia_valid |= ATTR_SIZE;
 286         }
 287         if (bmval[0] & FATTR4_WORD0_ACL) {
 288                 u32 nace;
 289                 struct nfs4_ace *ace;
 290
 291                 READ_BUF(4); len += 4;
 292                 nace = be32_to_cpup(p++);
 293
 294                 if (nace > NFS4_ACL_MAX)
 295                         return nfserr_fbig;
 296
 297                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
 298                 if (*acl == NULL)
 299                         return nfserr_jukebox;
 300
 301                 (*acl)->naces = nace;
 302                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 303                         READ_BUF(16); len += 16;
 304                         ace->type = be32_to_cpup(p++);
 305                         ace->flag = be32_to_cpup(p++);
 306                         ace->access_mask = be32_to_cpup(p++);
 307                         dummy32 = be32_to_cpup(p++);
 308                         READ_BUF(dummy32);
 309                         len += XDR_QUADLEN(dummy32) << 2;
 310                         READMEM(buf, dummy32);
 311                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 312                         status = nfs_ok;
 313                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 314                                 ;
 315                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 316                                 status = nfsd_map_name_to_gid(argp->rqstp,
 317                                                 buf, dummy32, &ace->who_gid);
 318                         else
 319                                 status = nfsd_map_name_to_uid(argp->rqstp,
 320                                                 buf, dummy32, &ace->who_uid);
 321                         if (status)
 322                                 return status;
 323                 }
 324         } else
 325                 *acl = NULL;
 326         if (bmval[1] & FATTR4_WORD1_MODE) {
 327                 READ_BUF(4);
 328                 len += 4;
 329                 iattr->ia_mode = be32_to_cpup(p++);
 330                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 331                 iattr->ia_valid |= ATTR_MODE;
 332         }
 333         if (bmval[1] & FATTR4_WORD1_OWNER) {
 334                 READ_BUF(4);
 335                 len += 4;
 336                 dummy32 = be32_to_cpup(p++);
 337                 READ_BUF(dummy32);
 338                 len += (XDR_QUADLEN(dummy32) << 2);
 339                 READMEM(buf, dummy32);
 340                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 341                         return status;
 342                 iattr->ia_valid |= ATTR_UID;
 343         }
 344         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 345                 READ_BUF(4);
 346                 len += 4;
 347                 dummy32 = be32_to_cpup(p++);
 348                 READ_BUF(dummy32);
 349                 len += (XDR_QUADLEN(dummy32) << 2);
 350                 READMEM(buf, dummy32);
 351                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 352                         return status;
 353                 iattr->ia_valid |= ATTR_GID;
 354         }
 355         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 356                 READ_BUF(4);
 357                 len += 4;
 358                 dummy32 = be32_to_cpup(p++);
 359                 switch (dummy32) {
 360                 case NFS4_SET_TO_CLIENT_TIME:
 361                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 362                            all 32 bits of 'nseconds'. */
 363                         READ_BUF(12);
 364                         len += 12;
 365                         p = xdr_decode_hyper(p, &sec);
 366                         iattr->ia_atime.tv_sec = (time_t)sec;
 367                         iattr->ia_atime.tv_nsec = be32_to_cpup(p++);
 368                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 369                                 return nfserr_inval;
 370                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 371                         break;
 372                 case NFS4_SET_TO_SERVER_TIME:
 373                         iattr->ia_valid |= ATTR_ATIME;
 374                         break;
 375                 default:
 376                         goto xdr_error;
 377                 }
 378         }
 379         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 380                 READ_BUF(4);
 381                 len += 4;
 382                 dummy32 = be32_to_cpup(p++);
 383                 switch (dummy32) {
 384                 case NFS4_SET_TO_CLIENT_TIME:
 385                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 386                            all 32 bits of 'nseconds'. */
 387                         READ_BUF(12);
 388                         len += 12;
 389                         p = xdr_decode_hyper(p, &sec);
 390                         iattr->ia_mtime.tv_sec = sec;
 391                         iattr->ia_mtime.tv_nsec = be32_to_cpup(p++);
 392                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 393                                 return nfserr_inval;
 394                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 395                         break;
 396                 case NFS4_SET_TO_SERVER_TIME:
 397                         iattr->ia_valid |= ATTR_MTIME;
 398                         break;
 399                 default:
 400                         goto xdr_error;
 401                 }
 402         }
 403
 404         label->len = 0;
 405 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 406         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 407                 READ_BUF(4);
 408                 len += 4;
 409                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 410                 READ_BUF(4);
 411                 len += 4;
 412                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 413                 READ_BUF(4);
 414                 len += 4;
 415                 dummy32 = be32_to_cpup(p++);
 416                 READ_BUF(dummy32);
 417                 if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
 418                         return nfserr_badlabel;
 419                 len += (XDR_QUADLEN(dummy32) << 2);
 420                 READMEM(buf, dummy32);
 421                 label->len = dummy32;
 422                 label->data = svcxdr_dupstr(argp, buf, dummy32);
 423                 if (!label->data)
 424                         return nfserr_jukebox;
 425         }
 426 #endif
 427
 428         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 429             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 430             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 431                 READ_BUF(expected_len - len);
 432         else if (len != expected_len)
 433                 goto xdr_error;
 434
 435         DECODE_TAIL;
 436 }
 437
 438 static __be32
 439 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 440 {
 441         DECODE_HEAD;
 442
 443         READ_BUF(sizeof(stateid_t));
 444         sid->si_generation = be32_to_cpup(p++);
 445         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 446
 447         DECODE_TAIL;
 448 }
 449
 450 static __be32
 451 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 452 {
 453         DECODE_HEAD;
 454
 455         READ_BUF(4);
 456         access->ac_req_access = be32_to_cpup(p++);
 457
 458         DECODE_TAIL;
 459 }
 460
 461 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 462 {
 463         DECODE_HEAD;
 464         u32 dummy, uid, gid;
 465         char *machine_name;
 466         int i;
 467         int nr_secflavs;
 468
 469         /* callback_sec_params4 */
 470         READ_BUF(4);
 471         nr_secflavs = be32_to_cpup(p++);
 472         if (nr_secflavs)
 473                 cbs->flavor = (u32)(-1);
 474         else
 475                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 476                 cbs->flavor = 0;
 477         for (i = 0; i < nr_secflavs; ++i) {
 478                 READ_BUF(4);
 479                 dummy = be32_to_cpup(p++);
 480                 switch (dummy) {
 481                 case RPC_AUTH_NULL:
 482                         /* Nothing to read */
 483                         if (cbs->flavor == (u32)(-1))
 484                                 cbs->flavor = RPC_AUTH_NULL;
 485                         break;
 486                 case RPC_AUTH_UNIX:
 487                         READ_BUF(8);
 488                         /* stamp */
 489                         dummy = be32_to_cpup(p++);
 490
 491                         /* machine name */
 492                         dummy = be32_to_cpup(p++);
 493                         READ_BUF(dummy);
 494                         SAVEMEM(machine_name, dummy);
 495
 496                         /* uid, gid */
 497                         READ_BUF(8);
 498                         uid = be32_to_cpup(p++);
 499                         gid = be32_to_cpup(p++);
 500
 501                         /* more gids */
 502                         READ_BUF(4);
 503                         dummy = be32_to_cpup(p++);
 504                         READ_BUF(dummy * 4);
 505                         if (cbs->flavor == (u32)(-1)) {
 506                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 507                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 508                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 509                                         cbs->uid = kuid;
 510                                         cbs->gid = kgid;
 511                                         cbs->flavor = RPC_AUTH_UNIX;
 512                                 } else {
 513                                         dprintk("RPC_AUTH_UNIX with invalid"
 514                                                 "uid or gid ignoring!\n");
 515                                 }
 516                         }
 517                         break;
 518                 case RPC_AUTH_GSS:
 519                         dprintk("RPC_AUTH_GSS callback secflavor "
 520                                 "not supported!\n");
 521                         READ_BUF(8);
 522                         /* gcbp_service */
 523                         dummy = be32_to_cpup(p++);
 524                         /* gcbp_handle_from_server */
 525                         dummy = be32_to_cpup(p++);
 526                         READ_BUF(dummy);
 527                         p += XDR_QUADLEN(dummy);
 528                         /* gcbp_handle_from_client */
 529                         READ_BUF(4);
 530                         dummy = be32_to_cpup(p++);
 531                         READ_BUF(dummy);
 532                         break;
 533                 default:
 534                         dprintk("Illegal callback secflavor\n");
 535                         return nfserr_inval;
 536                 }
 537         }
 538         DECODE_TAIL;
 539 }
 540
 541 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 542 {
 543         DECODE_HEAD;
 544
 545         READ_BUF(4);
 546         bc->bc_cb_program = be32_to_cpup(p++);
 547         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 548
 549         DECODE_TAIL;
 550 }
 551
 552 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 553 {
 554         DECODE_HEAD;
 555
 556         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 557         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 558         bcts->dir = be32_to_cpup(p++);
 559         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 560          * could help us figure out we should be using it. */
 561         DECODE_TAIL;
 562 }
 563
 564 static __be32
 565 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 566 {
 567         DECODE_HEAD;
 568
 569         READ_BUF(4);
 570         close->cl_seqid = be32_to_cpup(p++);
 571         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 572
 573         DECODE_TAIL;
 574 }
 575
 576
 577 static __be32
 578 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 579 {
 580         DECODE_HEAD;
 581
 582         READ_BUF(12);
 583         p = xdr_decode_hyper(p, &commit->co_offset);
 584         commit->co_count = be32_to_cpup(p++);
 585
 586         DECODE_TAIL;
 587 }
 588
 589 static __be32
 590 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 591 {
 592         DECODE_HEAD;
 593
 594         READ_BUF(4);
 595         create->cr_type = be32_to_cpup(p++);
 596         switch (create->cr_type) {
 597         case NF4LNK:
 598                 READ_BUF(4);
 599                 create->cr_datalen = be32_to_cpup(p++);
 600                 READ_BUF(create->cr_datalen);
 601                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 602                 if (!create->cr_data)
 603                         return nfserr_jukebox;
 604                 break;
 605         case NF4BLK:
 606         case NF4CHR:
 607                 READ_BUF(8);
 608                 create->cr_specdata1 = be32_to_cpup(p++);
 609                 create->cr_specdata2 = be32_to_cpup(p++);
 610                 break;
 611         case NF4SOCK:
 612         case NF4FIFO:
 613         case NF4DIR:
 614         default:
 615                 break;
 616         }
 617
 618         READ_BUF(4);
 619         create->cr_namelen = be32_to_cpup(p++);
 620         READ_BUF(create->cr_namelen);
 621         SAVEMEM(create->cr_name, create->cr_namelen);
 622         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 623                 return status;
 624
 625         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 626                                     &create->cr_acl, &create->cr_label);
 627         if (status)
 628                 goto out;
 629
 630         DECODE_TAIL;
 631 }
 632
 633 static inline __be32
 634 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 635 {
 636         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 637 }
 638
 639 static inline __be32
 640 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 641 {
 642         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 643 }
 644
 645 static __be32
 646 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 647 {
 648         DECODE_HEAD;
 649
 650         READ_BUF(4);
 651         link->li_namelen = be32_to_cpup(p++);
 652         READ_BUF(link->li_namelen);
 653         SAVEMEM(link->li_name, link->li_namelen);
 654         if ((status = check_filename(link->li_name, link->li_namelen)))
 655                 return status;
 656
 657         DECODE_TAIL;
 658 }
 659
 660 static __be32
 661 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 662 {
 663         DECODE_HEAD;
 664
 665         /*
 666         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 667         */
 668         READ_BUF(28);
 669         lock->lk_type = be32_to_cpup(p++);
 670         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 671                 goto xdr_error;
 672         lock->lk_reclaim = be32_to_cpup(p++);
 673         p = xdr_decode_hyper(p, &lock->lk_offset);
 674         p = xdr_decode_hyper(p, &lock->lk_length);
 675         lock->lk_is_new = be32_to_cpup(p++);
 676
 677         if (lock->lk_is_new) {
 678                 READ_BUF(4);
 679                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 680                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 681                 if (status)
 682                         return status;
 683                 READ_BUF(8 + sizeof(clientid_t));
 684                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 685                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 686                 lock->lk_new_owner.len = be32_to_cpup(p++);
 687                 READ_BUF(lock->lk_new_owner.len);
 688                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 689         } else {
 690                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 691                 if (status)
 692                         return status;
 693                 READ_BUF(4);
 694                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 695         }
 696
 697         DECODE_TAIL;
 698 }
 699
 700 static __be32
 701 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 702 {
 703         DECODE_HEAD;
 704
 705         READ_BUF(32);
 706         lockt->lt_type = be32_to_cpup(p++);
 707         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 708                 goto xdr_error;
 709         p = xdr_decode_hyper(p, &lockt->lt_offset);
 710         p = xdr_decode_hyper(p, &lockt->lt_length);
 711         COPYMEM(&lockt->lt_clientid, 8);
 712         lockt->lt_owner.len = be32_to_cpup(p++);
 713         READ_BUF(lockt->lt_owner.len);
 714         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 715
 716         DECODE_TAIL;
 717 }
 718
 719 static __be32
 720 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 721 {
 722         DECODE_HEAD;
 723
 724         READ_BUF(8);
 725         locku->lu_type = be32_to_cpup(p++);
 726         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 727                 goto xdr_error;
 728         locku->lu_seqid = be32_to_cpup(p++);
 729         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 730         if (status)
 731                 return status;
 732         READ_BUF(16);
 733         p = xdr_decode_hyper(p, &locku->lu_offset);
 734         p = xdr_decode_hyper(p, &locku->lu_length);
 735
 736         DECODE_TAIL;
 737 }
 738
 739 static __be32
 740 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 741 {
 742         DECODE_HEAD;
 743
 744         READ_BUF(4);
 745         lookup->lo_len = be32_to_cpup(p++);
 746         READ_BUF(lookup->lo_len);
 747         SAVEMEM(lookup->lo_name, lookup->lo_len);
 748         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 749                 return status;
 750
 751         DECODE_TAIL;
 752 }
 753
 754 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 755 {
 756         __be32 *p;
 757         u32 w;
 758
 759         READ_BUF(4);
 760         w = be32_to_cpup(p++);
 761         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 762         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 763         if (deleg_when)
 764                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 765
 766         switch (w & NFS4_SHARE_ACCESS_MASK) {
 767         case NFS4_SHARE_ACCESS_READ:
 768         case NFS4_SHARE_ACCESS_WRITE:
 769         case NFS4_SHARE_ACCESS_BOTH:
 770                 break;
 771         default:
 772                 return nfserr_bad_xdr;
 773         }
 774         w &= ~NFS4_SHARE_ACCESS_MASK;
 775         if (!w)
 776                 return nfs_ok;
 777         if (!argp->minorversion)
 778                 return nfserr_bad_xdr;
 779         switch (w & NFS4_SHARE_WANT_MASK) {
 780         case NFS4_SHARE_WANT_NO_PREFERENCE:
 781         case NFS4_SHARE_WANT_READ_DELEG:
 782         case NFS4_SHARE_WANT_WRITE_DELEG:
 783         case NFS4_SHARE_WANT_ANY_DELEG:
 784         case NFS4_SHARE_WANT_NO_DELEG:
 785         case NFS4_SHARE_WANT_CANCEL:
 786                 break;
 787         default:
 788                 return nfserr_bad_xdr;
 789         }
 790         w &= ~NFS4_SHARE_WANT_MASK;
 791         if (!w)
 792                 return nfs_ok;
 793
 794         if (!deleg_when)        /* open_downgrade */
 795                 return nfserr_inval;
 796         switch (w) {
 797         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 798         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 799         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 800               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 801                 return nfs_ok;
 802         }
 803 xdr_error:
 804         return nfserr_bad_xdr;
 805 }
 806
 807 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 808 {
 809         __be32 *p;
 810
 811         READ_BUF(4);
 812         *x = be32_to_cpup(p++);
 813         /* Note: unlinke access bits, deny bits may be zero. */
 814         if (*x & ~NFS4_SHARE_DENY_BOTH)
 815                 return nfserr_bad_xdr;
 816         return nfs_ok;
 817 xdr_error:
 818         return nfserr_bad_xdr;
 819 }
 820
 821 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 822 {
 823         __be32 *p;
 824
 825         READ_BUF(4);
 826         o->len = be32_to_cpup(p++);
 827
 828         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 829                 return nfserr_bad_xdr;
 830
 831         READ_BUF(o->len);
 832         SAVEMEM(o->data, o->len);
 833         return nfs_ok;
 834 xdr_error:
 835         return nfserr_bad_xdr;
 836 }
 837
 838 static __be32
 839 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 840 {
 841         DECODE_HEAD;
 842         u32 dummy;
 843
 844         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 845         open->op_iattr.ia_valid = 0;
 846         open->op_openowner = NULL;
 847
 848         open->op_xdr_error = 0;
 849         /* seqid, share_access, share_deny, clientid, ownerlen */
 850         READ_BUF(4);
 851         open->op_seqid = be32_to_cpup(p++);
 852         /* decode, yet ignore deleg_when until supported */
 853         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 854                                            &open->op_deleg_want, &dummy);
 855         if (status)
 856                 goto xdr_error;
 857         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 858         if (status)
 859                 goto xdr_error;
 860         READ_BUF(sizeof(clientid_t));
 861         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 862         status = nfsd4_decode_opaque(argp, &open->op_owner);
 863         if (status)
 864                 goto xdr_error;
 865         READ_BUF(4);
 866         open->op_create = be32_to_cpup(p++);
 867         switch (open->op_create) {
 868         case NFS4_OPEN_NOCREATE:
 869                 break;
 870         case NFS4_OPEN_CREATE:
 871                 READ_BUF(4);
 872                 open->op_createmode = be32_to_cpup(p++);
 873                 switch (open->op_createmode) {
 874                 case NFS4_CREATE_UNCHECKED:
 875                 case NFS4_CREATE_GUARDED:
 876                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 877                                 &open->op_iattr, &open->op_acl, &open->op_label);
 878                         if (status)
 879                                 goto out;
 880                         break;
 881                 case NFS4_CREATE_EXCLUSIVE:
 882                         READ_BUF(NFS4_VERIFIER_SIZE);
 883                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 884                         break;
 885                 case NFS4_CREATE_EXCLUSIVE4_1:
 886                         if (argp->minorversion < 1)
 887                                 goto xdr_error;
 888                         READ_BUF(NFS4_VERIFIER_SIZE);
 889                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 890                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 891                                 &open->op_iattr, &open->op_acl, &open->op_label);
 892                         if (status)
 893                                 goto out;
 894                         break;
 895                 default:
 896                         goto xdr_error;
 897                 }
 898                 break;
 899         default:
 900                 goto xdr_error;
 901         }
 902
 903         /* open_claim */
 904         READ_BUF(4);
 905         open->op_claim_type = be32_to_cpup(p++);
 906         switch (open->op_claim_type) {
 907         case NFS4_OPEN_CLAIM_NULL:
 908         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 909                 READ_BUF(4);
 910                 open->op_fname.len = be32_to_cpup(p++);
 911                 READ_BUF(open->op_fname.len);
 912                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 913                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 914                         return status;
 915                 break;
 916         case NFS4_OPEN_CLAIM_PREVIOUS:
 917                 READ_BUF(4);
 918                 open->op_delegate_type = be32_to_cpup(p++);
 919                 break;
 920         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 921                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 922                 if (status)
 923                         return status;
 924                 READ_BUF(4);
 925                 open->op_fname.len = be32_to_cpup(p++);
 926                 READ_BUF(open->op_fname.len);
 927                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 928                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 929                         return status;
 930                 break;
 931         case NFS4_OPEN_CLAIM_FH:
 932         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 933                 if (argp->minorversion < 1)
 934                         goto xdr_error;
 935                 /* void */
 936                 break;
 937         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 938                 if (argp->minorversion < 1)
 939                         goto xdr_error;
 940                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 941                 if (status)
 942                         return status;
 943                 break;
 944         default:
 945                 goto xdr_error;
 946         }
 947
 948         DECODE_TAIL;
 949 }
 950
 951 static __be32
 952 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 953 {
 954         DECODE_HEAD;
 955
 956         if (argp->minorversion >= 1)
 957                 return nfserr_notsupp;
 958
 959         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 960         if (status)
 961                 return status;
 962         READ_BUF(4);
 963         open_conf->oc_seqid = be32_to_cpup(p++);
 964
 965         DECODE_TAIL;
 966 }
 967
 968 static __be32
 969 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 970 {
 971         DECODE_HEAD;
 972
 973         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 974         if (status)
 975                 return status;
 976         READ_BUF(4);
 977         open_down->od_seqid = be32_to_cpup(p++);
 978         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 979                                            &open_down->od_deleg_want, NULL);
 980         if (status)
 981                 return status;
 982         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 983         if (status)
 984                 return status;
 985         DECODE_TAIL;
 986 }
 987
 988 static __be32
 989 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 990 {
 991         DECODE_HEAD;
 992
 993         READ_BUF(4);
 994         putfh->pf_fhlen = be32_to_cpup(p++);
 995         if (putfh->pf_fhlen > NFS4_FHSIZE)
 996                 goto xdr_error;
 997         READ_BUF(putfh->pf_fhlen);
 998         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 999
1000         DECODE_TAIL;
1001 }
1002
1003 static __be32
1004 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1005 {
1006         if (argp->minorversion == 0)
1007                 return nfs_ok;
1008         return nfserr_notsupp;
1009 }
1010
1011 static __be32
1012 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1013 {
1014         DECODE_HEAD;
1015
1016         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1017         if (status)
1018                 return status;
1019         READ_BUF(12);
1020         p = xdr_decode_hyper(p, &read->rd_offset);
1021         read->rd_length = be32_to_cpup(p++);
1022
1023         DECODE_TAIL;
1024 }
1025
1026 static __be32
1027 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1028 {
1029         DECODE_HEAD;
1030
1031         READ_BUF(24);
1032         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1033         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1034         readdir->rd_dircount = be32_to_cpup(p++);
1035         readdir->rd_maxcount = be32_to_cpup(p++);
1036         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1037                 goto out;
1038
1039         DECODE_TAIL;
1040 }
1041
1042 static __be32
1043 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1044 {
1045         DECODE_HEAD;
1046
1047         READ_BUF(4);
1048         remove->rm_namelen = be32_to_cpup(p++);
1049         READ_BUF(remove->rm_namelen);
1050         SAVEMEM(remove->rm_name, remove->rm_namelen);
1051         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1052                 return status;
1053
1054         DECODE_TAIL;
1055 }
1056
1057 static __be32
1058 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1059 {
1060         DECODE_HEAD;
1061
1062         READ_BUF(4);
1063         rename->rn_snamelen = be32_to_cpup(p++);
1064         READ_BUF(rename->rn_snamelen + 4);
1065         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1066         rename->rn_tnamelen = be32_to_cpup(p++);
1067         READ_BUF(rename->rn_tnamelen);
1068         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1069         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1070                 return status;
1071         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1072                 return status;
1073
1074         DECODE_TAIL;
1075 }
1076
1077 static __be32
1078 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1079 {
1080         DECODE_HEAD;
1081
1082         if (argp->minorversion >= 1)
1083                 return nfserr_notsupp;
1084
1085         READ_BUF(sizeof(clientid_t));
1086         COPYMEM(clientid, sizeof(clientid_t));
1087
1088         DECODE_TAIL;
1089 }
1090
1091 static __be32
1092 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1093                      struct nfsd4_secinfo *secinfo)
1094 {
1095         DECODE_HEAD;
1096
1097         READ_BUF(4);
1098         secinfo->si_namelen = be32_to_cpup(p++);
1099         READ_BUF(secinfo->si_namelen);
1100         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1101         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1102         if (status)
1103                 return status;
1104         DECODE_TAIL;
1105 }
1106
1107 static __be32
1108 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1109                      struct nfsd4_secinfo_no_name *sin)
1110 {
1111         DECODE_HEAD;
1112
1113         READ_BUF(4);
1114         sin->sin_style = be32_to_cpup(p++);
1115         DECODE_TAIL;
1116 }
1117
1118 static __be32
1119 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1120 {
1121         __be32 status;
1122
1123         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1124         if (status)
1125                 return status;
1126         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1127                                   &setattr->sa_acl, &setattr->sa_label);
1128 }
1129
1130 static __be32
1131 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1132 {
1133         DECODE_HEAD;
1134
1135         if (argp->minorversion >= 1)
1136                 return nfserr_notsupp;
1137
1138         READ_BUF(NFS4_VERIFIER_SIZE);
1139         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1140
1141         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1142         if (status)
1143                 return nfserr_bad_xdr;
1144         READ_BUF(8);
1145         setclientid->se_callback_prog = be32_to_cpup(p++);
1146         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1147
1148         READ_BUF(setclientid->se_callback_netid_len + 4);
1149         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1150         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1151
1152         READ_BUF(setclientid->se_callback_addr_len + 4);
1153         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1154         setclientid->se_callback_ident = be32_to_cpup(p++);
1155
1156         DECODE_TAIL;
1157 }
1158
1159 static __be32
1160 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1161 {
1162         DECODE_HEAD;
1163
1164         if (argp->minorversion >= 1)
1165                 return nfserr_notsupp;
1166
1167         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1168         COPYMEM(&scd_c->sc_clientid, 8);
1169         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1170
1171         DECODE_TAIL;
1172 }
1173
1174 /* Also used for NVERIFY */
1175 static __be32
1176 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1177 {
1178         DECODE_HEAD;
1179
1180         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1181                 goto out;
1182
1183         /* For convenience's sake, we compare raw xdr'd attributes in
1184          * nfsd4_proc_verify */
1185
1186         READ_BUF(4);
1187         verify->ve_attrlen = be32_to_cpup(p++);
1188         READ_BUF(verify->ve_attrlen);
1189         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1190
1191         DECODE_TAIL;
1192 }
1193
1194 static __be32
1195 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1196 {
1197         int avail;
1198         int len;
1199         DECODE_HEAD;
1200
1201         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1202         if (status)
1203                 return status;
1204         READ_BUF(16);
1205         p = xdr_decode_hyper(p, &write->wr_offset);
1206         write->wr_stable_how = be32_to_cpup(p++);
1207         if (write->wr_stable_how > 2)
1208                 goto xdr_error;
1209         write->wr_buflen = be32_to_cpup(p++);
1210
1211         /* Sorry .. no magic macros for this.. *
1212          * READ_BUF(write->wr_buflen);
1213          * SAVEMEM(write->wr_buf, write->wr_buflen);
1214          */
1215         avail = (char*)argp->end - (char*)argp->p;
1216         if (avail + argp->pagelen < write->wr_buflen) {
1217                 dprintk("NFSD: xdr error (%s:%d)\n",
1218                                 __FILE__, __LINE__);
1219                 goto xdr_error;
1220         }
1221         write->wr_head.iov_base = p;
1222         write->wr_head.iov_len = avail;
1223         write->wr_pagelist = argp->pagelist;
1224
1225         len = XDR_QUADLEN(write->wr_buflen) << 2;
1226         if (len >= avail) {
1227                 int pages;
1228
1229                 len -= avail;
1230
1231                 pages = len >> PAGE_SHIFT;
1232                 argp->pagelist += pages;
1233                 argp->pagelen -= pages * PAGE_SIZE;
1234                 len -= pages * PAGE_SIZE;
1235
1236                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1237                 argp->pagelist++;
1238                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1239         }
1240         argp->p += XDR_QUADLEN(len);
1241
1242         DECODE_TAIL;
1243 }
1244
1245 static __be32
1246 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1247 {
1248         DECODE_HEAD;
1249
1250         if (argp->minorversion >= 1)
1251                 return nfserr_notsupp;
1252
1253         READ_BUF(12);
1254         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1255         rlockowner->rl_owner.len = be32_to_cpup(p++);
1256         READ_BUF(rlockowner->rl_owner.len);
1257         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1258
1259         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1260                 return nfserr_inval;
1261         DECODE_TAIL;
1262 }
1263
1264 static __be32
1265 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1266                          struct nfsd4_exchange_id *exid)
1267 {
1268         int dummy, tmp;
1269         DECODE_HEAD;
1270
1271         READ_BUF(NFS4_VERIFIER_SIZE);
1272         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1273
1274         status = nfsd4_decode_opaque(argp, &exid->clname);
1275         if (status)
1276                 return nfserr_bad_xdr;
1277
1278         READ_BUF(4);
1279         exid->flags = be32_to_cpup(p++);
1280
1281         /* Ignore state_protect4_a */
1282         READ_BUF(4);
1283         exid->spa_how = be32_to_cpup(p++);
1284         switch (exid->spa_how) {
1285         case SP4_NONE:
1286                 break;
1287         case SP4_MACH_CRED:
1288                 /* spo_must_enforce */
1289                 READ_BUF(4);
1290                 dummy = be32_to_cpup(p++);
1291                 READ_BUF(dummy * 4);
1292                 p += dummy;
1293
1294                 /* spo_must_allow */
1295                 READ_BUF(4);
1296                 dummy = be32_to_cpup(p++);
1297                 READ_BUF(dummy * 4);
1298                 p += dummy;
1299                 break;
1300         case SP4_SSV:
1301                 /* ssp_ops */
1302                 READ_BUF(4);
1303                 dummy = be32_to_cpup(p++);
1304                 READ_BUF(dummy * 4);
1305                 p += dummy;
1306
1307                 READ_BUF(4);
1308                 dummy = be32_to_cpup(p++);
1309                 READ_BUF(dummy * 4);
1310                 p += dummy;
1311
1312                 /* ssp_hash_algs<> */
1313                 READ_BUF(4);
1314                 tmp = be32_to_cpup(p++);
1315                 while (tmp--) {
1316                         READ_BUF(4);
1317                         dummy = be32_to_cpup(p++);
1318                         READ_BUF(dummy);
1319                         p += XDR_QUADLEN(dummy);
1320                 }
1321
1322                 /* ssp_encr_algs<> */
1323                 READ_BUF(4);
1324                 tmp = be32_to_cpup(p++);
1325                 while (tmp--) {
1326                         READ_BUF(4);
1327                         dummy = be32_to_cpup(p++);
1328                         READ_BUF(dummy);
1329                         p += XDR_QUADLEN(dummy);
1330                 }
1331
1332                 /* ssp_window and ssp_num_gss_handles */
1333                 READ_BUF(8);
1334                 dummy = be32_to_cpup(p++);
1335                 dummy = be32_to_cpup(p++);
1336                 break;
1337         default:
1338                 goto xdr_error;
1339         }
1340
1341         /* Ignore Implementation ID */
1342         READ_BUF(4);    /* nfs_impl_id4 array length */
1343         dummy = be32_to_cpup(p++);
1344
1345         if (dummy > 1)
1346                 goto xdr_error;
1347
1348         if (dummy == 1) {
1349                 /* nii_domain */
1350                 READ_BUF(4);
1351                 dummy = be32_to_cpup(p++);
1352                 READ_BUF(dummy);
1353                 p += XDR_QUADLEN(dummy);
1354
1355                 /* nii_name */
1356                 READ_BUF(4);
1357                 dummy = be32_to_cpup(p++);
1358                 READ_BUF(dummy);
1359                 p += XDR_QUADLEN(dummy);
1360
1361                 /* nii_date */
1362                 READ_BUF(12);
1363                 p += 3;
1364         }
1365         DECODE_TAIL;
1366 }
1367
1368 static __be32
1369 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1370                             struct nfsd4_create_session *sess)
1371 {
1372         DECODE_HEAD;
1373         u32 dummy;
1374
1375         READ_BUF(16);
1376         COPYMEM(&sess->clientid, 8);
1377         sess->seqid = be32_to_cpup(p++);
1378         sess->flags = be32_to_cpup(p++);
1379
1380         /* Fore channel attrs */
1381         READ_BUF(28);
1382         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1383         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1384         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1385         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1386         sess->fore_channel.maxops = be32_to_cpup(p++);
1387         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1388         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1389         if (sess->fore_channel.nr_rdma_attrs == 1) {
1390                 READ_BUF(4);
1391                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1392         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1393                 dprintk("Too many fore channel attr bitmaps!\n");
1394                 goto xdr_error;
1395         }
1396
1397         /* Back channel attrs */
1398         READ_BUF(28);
1399         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1400         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1401         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1402         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1403         sess->back_channel.maxops = be32_to_cpup(p++);
1404         sess->back_channel.maxreqs = be32_to_cpup(p++);
1405         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1406         if (sess->back_channel.nr_rdma_attrs == 1) {
1407                 READ_BUF(4);
1408                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1409         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1410                 dprintk("Too many back channel attr bitmaps!\n");
1411                 goto xdr_error;
1412         }
1413
1414         READ_BUF(4);
1415         sess->callback_prog = be32_to_cpup(p++);
1416         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1417         DECODE_TAIL;
1418 }
1419
1420 static __be32
1421 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1422                              struct nfsd4_destroy_session *destroy_session)
1423 {
1424         DECODE_HEAD;
1425         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1426         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1427
1428         DECODE_TAIL;
1429 }
1430
1431 static __be32
1432 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1433                           struct nfsd4_free_stateid *free_stateid)
1434 {
1435         DECODE_HEAD;
1436
1437         READ_BUF(sizeof(stateid_t));
1438         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1439         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1440
1441         DECODE_TAIL;
1442 }
1443
1444 static __be32
1445 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1446                       struct nfsd4_sequence *seq)
1447 {
1448         DECODE_HEAD;
1449
1450         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1451         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1452         seq->seqid = be32_to_cpup(p++);
1453         seq->slotid = be32_to_cpup(p++);
1454         seq->maxslots = be32_to_cpup(p++);
1455         seq->cachethis = be32_to_cpup(p++);
1456
1457         DECODE_TAIL;
1458 }
1459
1460 static __be32
1461 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1462 {
1463         int i;
1464         __be32 *p, status;
1465         struct nfsd4_test_stateid_id *stateid;
1466
1467         READ_BUF(4);
1468         test_stateid->ts_num_ids = ntohl(*p++);
1469
1470         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1471
1472         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1473                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1474                 if (!stateid) {
1475                         status = nfserrno(-ENOMEM);
1476                         goto out;
1477                 }
1478
1479                 INIT_LIST_HEAD(&stateid->ts_id_list);
1480                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1481
1482                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1483                 if (status)
1484                         goto out;
1485         }
1486
1487         status = 0;
1488 out:
1489         return status;
1490 xdr_error:
1491         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1492         status = nfserr_bad_xdr;
1493         goto out;
1494 }
1495
1496 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1497 {
1498         DECODE_HEAD;
1499
1500         READ_BUF(8);
1501         COPYMEM(&dc->clientid, 8);
1502
1503         DECODE_TAIL;
1504 }
1505
1506 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1507 {
1508         DECODE_HEAD;
1509
1510         READ_BUF(4);
1511         rc->rca_one_fs = be32_to_cpup(p++);
1512
1513         DECODE_TAIL;
1514 }
1515
1516 static __be32
1517 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1518 {
1519         return nfs_ok;
1520 }
1521
1522 static __be32
1523 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1524 {
1525         return nfserr_notsupp;
1526 }
1527
1528 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1529
1530 static nfsd4_dec nfsd4_dec_ops[] = {
1531         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1532         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1533         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1534         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1535         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1536         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1537         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1538         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1539         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1540         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1541         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1542         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1543         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1544         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1545         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1546         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1547         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1548         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1549         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1550         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1551         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1552         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1553         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1554         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1555         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1556         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1557         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1558         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1559         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1560         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1561         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1562         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1563         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1564         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1565         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1566         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1567         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1568
1569         /* new operations for NFSv4.1 */
1570         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1571         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1572         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1573         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1574         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1575         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1576         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1577         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1578         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1579         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1580         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1581         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1582         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1583         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1584         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1585         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1586         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1587         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1588         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1589 };
1590
1591 static inline bool
1592 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1593 {
1594         if (op->opnum < FIRST_NFS4_OP)
1595                 return false;
1596         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1597                 return false;
1598         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1599                 return false;
1600         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1601                 return false;
1602         return true;
1603 }
1604
1605 static __be32
1606 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1607 {
1608         DECODE_HEAD;
1609         struct nfsd4_op *op;
1610         bool cachethis = false;
1611         int auth_slack= argp->rqstp->rq_auth_slack;
1612         int max_reply = auth_slack + 8; /* opcnt, status */
1613         int readcount = 0;
1614         int readbytes = 0;
1615         int i;
1616
1617         READ_BUF(4);
1618         argp->taglen = be32_to_cpup(p++);
1619         READ_BUF(argp->taglen + 8);
1620         SAVEMEM(argp->tag, argp->taglen);
1621         argp->minorversion = be32_to_cpup(p++);
1622         argp->opcnt = be32_to_cpup(p++);
1623         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1624
1625         if (argp->taglen > NFSD4_MAX_TAGLEN)
1626                 goto xdr_error;
1627         if (argp->opcnt > 100)
1628                 goto xdr_error;
1629
1630         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1631                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1632                 if (!argp->ops) {
1633                         argp->ops = argp->iops;
1634                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1635                         goto xdr_error;
1636                 }
1637         }
1638
1639         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1640                 argp->opcnt = 0;
1641
1642         for (i = 0; i < argp->opcnt; i++) {
1643                 op = &argp->ops[i];
1644                 op->replay = NULL;
1645
1646                 READ_BUF(4);
1647                 op->opnum = be32_to_cpup(p++);
1648
1649                 if (nfsd4_opnum_in_range(argp, op))
1650                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1651                 else {
1652                         op->opnum = OP_ILLEGAL;
1653                         op->status = nfserr_op_illegal;
1654                 }
1655                 /*
1656                  * We'll try to cache the result in the DRC if any one
1657                  * op in the compound wants to be cached:
1658                  */
1659                 cachethis |= nfsd4_cache_this_op(op);
1660
1661                 if (op->opnum == OP_READ) {
1662                         readcount++;
1663                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1664                 } else
1665                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1666
1667                 if (op->status) {
1668                         argp->opcnt = i+1;
1669                         break;
1670                 }
1671         }
1672         /* Sessions make the DRC unnecessary: */
1673         if (argp->minorversion)
1674                 cachethis = false;
1675         svc_reserve(argp->rqstp, max_reply + readbytes);
1676         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1677
1678         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1679                 argp->rqstp->rq_splice_ok = false;
1680
1681         DECODE_TAIL;
1682 }
1683
1684 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1685 {
1686         if (IS_I_VERSION(inode)) {
1687                 p = xdr_encode_hyper(p, inode->i_version);
1688         } else {
1689                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1690                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1691         }
1692         return p;
1693 }
1694
1695 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1696 {
1697         *p++ = cpu_to_be32(c->atomic);
1698         if (c->change_supported) {
1699                 p = xdr_encode_hyper(p, c->before_change);
1700                 p = xdr_encode_hyper(p, c->after_change);
1701         } else {
1702                 *p++ = cpu_to_be32(c->before_ctime_sec);
1703                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1704                 *p++ = cpu_to_be32(c->after_ctime_sec);
1705                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1706         }
1707         return p;
1708 }
1709
1710 /* Encode as an array of strings the string given with components
1711  * separated @sep, escaped with esc_enter and esc_exit.
1712  */
1713 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1714                                           char *components, char esc_enter,
1715                                           char esc_exit)
1716 {
1717         __be32 *p;
1718         __be32 pathlen;
1719         int pathlen_offset;
1720         int strlen, count=0;
1721         char *str, *end, *next;
1722
1723         dprintk("nfsd4_encode_components(%s)\n", components);
1724
1725         pathlen_offset = xdr->buf->len;
1726         p = xdr_reserve_space(xdr, 4);
1727         if (!p)
1728                 return nfserr_resource;
1729         p++; /* We will fill this in with @count later */
1730
1731         end = str = components;
1732         while (*end) {
1733                 bool found_esc = false;
1734
1735                 /* try to parse as esc_start, ..., esc_end, sep */
1736                 if (*str == esc_enter) {
1737                         for (; *end && (*end != esc_exit); end++)
1738                                 /* find esc_exit or end of string */;
1739                         next = end + 1;
1740                         if (*end && (!*next || *next == sep)) {
1741                                 str++;
1742                                 found_esc = true;
1743                         }
1744                 }
1745
1746                 if (!found_esc)
1747                         for (; *end && (*end != sep); end++)
1748                                 /* find sep or end of string */;
1749
1750                 strlen = end - str;
1751                 if (strlen) {
1752                         p = xdr_reserve_space(xdr, strlen + 4);
1753                         if (!p)
1754                                 return nfserr_resource;
1755                         p = xdr_encode_opaque(p, str, strlen);
1756                         count++;
1757                 }
1758                 else
1759                         end++;
1760                 str = end;
1761         }
1762         pathlen = htonl(xdr->buf->len - pathlen_offset);
1763         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1764         return 0;
1765 }
1766
1767 /* Encode as an array of strings the string given with components
1768  * separated @sep.
1769  */
1770 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1771                                       char *components)
1772 {
1773         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1774 }
1775
1776 /*
1777  * encode a location element of a fs_locations structure
1778  */
1779 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1780                                         struct nfsd4_fs_location *location)
1781 {
1782         __be32 status;
1783
1784         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1785                                                 '[', ']');
1786         if (status)
1787                 return status;
1788         status = nfsd4_encode_components(xdr, '/', location->path);
1789         if (status)
1790                 return status;
1791         return 0;
1792 }
1793
1794 /*
1795  * Encode a path in RFC3530 'pathname4' format
1796  */
1797 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
1798                                 const struct path *root,
1799                                 const struct path *path)
1800 {
1801         struct path cur = *path;
1802         __be32 *p;
1803         struct dentry **components = NULL;
1804         unsigned int ncomponents = 0;
1805         __be32 err = nfserr_jukebox;
1806
1807         dprintk("nfsd4_encode_components(");
1808
1809         path_get(&cur);
1810         /* First walk the path up to the nfsd root, and store the
1811          * dentries/path components in an array.
1812          */
1813         for (;;) {
1814                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1815                         break;
1816                 if (cur.dentry == cur.mnt->mnt_root) {
1817                         if (follow_up(&cur))
1818                                 continue;
1819                         goto out_free;
1820                 }
1821                 if ((ncomponents & 15) == 0) {
1822                         struct dentry **new;
1823                         new = krealloc(components,
1824                                         sizeof(*new) * (ncomponents + 16),
1825                                         GFP_KERNEL);
1826                         if (!new)
1827                                 goto out_free;
1828                         components = new;
1829                 }
1830                 components[ncomponents++] = cur.dentry;
1831                 cur.dentry = dget_parent(cur.dentry);
1832         }
1833         err = nfserr_resource;
1834         p = xdr_reserve_space(xdr, 4);
1835         if (!p)
1836                 goto out_free;
1837         *p++ = cpu_to_be32(ncomponents);
1838
1839         while (ncomponents) {
1840                 struct dentry *dentry = components[ncomponents - 1];
1841                 unsigned int len;
1842
1843                 spin_lock(&dentry->d_lock);
1844                 len = dentry->d_name.len;
1845                 p = xdr_reserve_space(xdr, len + 4);
1846                 if (!p) {
1847                         spin_unlock(&dentry->d_lock);
1848                         goto out_free;
1849                 }
1850                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
1851                 dprintk("/%s", dentry->d_name.name);
1852                 spin_unlock(&dentry->d_lock);
1853                 dput(dentry);
1854                 ncomponents--;
1855         }
1856
1857         err = 0;
1858 out_free:
1859         dprintk(")\n");
1860         while (ncomponents)
1861                 dput(components[--ncomponents]);
1862         kfree(components);
1863         path_put(&cur);
1864         return err;
1865 }
1866
1867 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
1868                         struct svc_rqst *rqstp, const struct path *path)
1869 {
1870         struct svc_export *exp_ps;
1871         __be32 res;
1872
1873         exp_ps = rqst_find_fsidzero_export(rqstp);
1874         if (IS_ERR(exp_ps))
1875                 return nfserrno(PTR_ERR(exp_ps));
1876         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
1877         exp_put(exp_ps);
1878         return res;
1879 }
1880
1881 /*
1882  *  encode a fs_locations structure
1883  */
1884 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
1885                         struct svc_rqst *rqstp, struct svc_export *exp)
1886 {
1887         __be32 status;
1888         int i;
1889         __be32 *p;
1890         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1891
1892         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1893         if (status)
1894                 return status;
1895         p = xdr_reserve_space(xdr, 4);
1896         if (!p)
1897                 return nfserr_resource;
1898         *p++ = cpu_to_be32(fslocs->locations_count);
1899         for (i=0; i<fslocs->locations_count; i++) {
1900                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1901                 if (status)
1902                         return status;
1903         }
1904         return 0;
1905 }
1906
1907 static u32 nfs4_file_type(umode_t mode)
1908 {
1909         switch (mode & S_IFMT) {
1910         case S_IFIFO:   return NF4FIFO;
1911         case S_IFCHR:   return NF4CHR;
1912         case S_IFDIR:   return NF4DIR;
1913         case S_IFBLK:   return NF4BLK;
1914         case S_IFLNK:   return NF4LNK;
1915         case S_IFREG:   return NF4REG;
1916         case S_IFSOCK:  return NF4SOCK;
1917         default:        return NF4BAD;
1918         };
1919 }
1920
1921 static inline __be32
1922 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1923                      struct nfs4_ace *ace)
1924 {
1925         if (ace->whotype != NFS4_ACL_WHO_NAMED)
1926                 return nfs4_acl_write_who(xdr, ace->whotype);
1927         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1928                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1929         else
1930                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1931 }
1932
1933 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1934                               FATTR4_WORD0_RDATTR_ERROR)
1935 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1936
1937 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1938 static inline __be32
1939 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1940                             void *context, int len)
1941 {
1942         __be32 *p;
1943
1944         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
1945         if (!p)
1946                 return nfserr_resource;
1947
1948         /*
1949          * For now we use a 0 here to indicate the null translation; in
1950          * the future we may place a call to translation code here.
1951          */
1952         *p++ = cpu_to_be32(0); /* lfs */
1953         *p++ = cpu_to_be32(0); /* pi */
1954         p = xdr_encode_opaque(p, context, len);
1955         return 0;
1956 }
1957 #else
1958 static inline __be32
1959 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1960                             void *context, int len)
1961 { return 0; }
1962 #endif
1963
1964 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1965 {
1966         /* As per referral draft:  */
1967         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1968             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1969                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1970                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1971                         *rdattr_err = NFSERR_MOVED;
1972                 else
1973                         return nfserr_moved;
1974         }
1975         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1976         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1977         return 0;
1978 }
1979
1980
1981 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
1982 {
1983         struct path path = exp->ex_path;
1984         int err;
1985
1986         path_get(&path);
1987         while (follow_up(&path)) {
1988                 if (path.dentry != path.mnt->mnt_root)
1989                         break;
1990         }
1991         err = vfs_getattr(&path, stat);
1992         path_put(&path);
1993         return err;
1994 }
1995
1996 /*
1997  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1998  * ourselves.
1999  */
2000 static __be32
2001 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2002                 struct svc_export *exp,
2003                 struct dentry *dentry, u32 *bmval,
2004                 struct svc_rqst *rqstp, int ignore_crossmnt)
2005 {
2006         u32 bmval0 = bmval[0];
2007         u32 bmval1 = bmval[1];
2008         u32 bmval2 = bmval[2];
2009         struct kstat stat;
2010         struct svc_fh *tempfh = NULL;
2011         struct kstatfs statfs;
2012         __be32 *p;
2013         int starting_len = xdr->buf->len;
2014         int attrlen_offset;
2015         __be32 attrlen;
2016         u32 dummy;
2017         u64 dummy64;
2018         u32 rdattr_err = 0;
2019         __be32 status;
2020         int err;
2021         int aclsupport = 0;
2022         struct nfs4_acl *acl = NULL;
2023         void *context = NULL;
2024         int contextlen;
2025         bool contextsupport = false;
2026         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2027         u32 minorversion = resp->cstate.minorversion;
2028         struct path path = {
2029                 .mnt    = exp->ex_path.mnt,
2030                 .dentry = dentry,
2031         };
2032         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2033
2034         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2035         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2036         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2037         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2038
2039         if (exp->ex_fslocs.migrated) {
2040                 BUG_ON(bmval[2]);
2041                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2042                 if (status)
2043                         goto out;
2044         }
2045
2046         err = vfs_getattr(&path, &stat);
2047         if (err)
2048                 goto out_nfserr;
2049         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2050                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2051             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2052                        FATTR4_WORD1_SPACE_TOTAL))) {
2053                 err = vfs_statfs(&path, &statfs);
2054                 if (err)
2055                         goto out_nfserr;
2056         }
2057         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2058                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2059                 status = nfserr_jukebox;
2060                 if (!tempfh)
2061                         goto out;
2062                 fh_init(tempfh, NFS4_FHSIZE);
2063                 status = fh_compose(tempfh, exp, dentry, NULL);
2064                 if (status)
2065                         goto out;
2066                 fhp = tempfh;
2067         }
2068         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2069                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2070                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2071                 aclsupport = (err == 0);
2072                 if (bmval0 & FATTR4_WORD0_ACL) {
2073                         if (err == -EOPNOTSUPP)
2074                                 bmval0 &= ~FATTR4_WORD0_ACL;
2075                         else if (err == -EINVAL) {
2076                                 status = nfserr_attrnotsupp;
2077                                 goto out;
2078                         } else if (err != 0)
2079                                 goto out_nfserr;
2080                 }
2081         }
2082
2083 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2084         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2085                         bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2086                 err = security_inode_getsecctx(dentry->d_inode,
2087                                                 &context, &contextlen);
2088                 contextsupport = (err == 0);
2089                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2090                         if (err == -EOPNOTSUPP)
2091                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2092                         else if (err)
2093                                 goto out_nfserr;
2094                 }
2095         }
2096 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2097
2098         if (bmval2) {
2099                 p = xdr_reserve_space(xdr, 16);
2100                 if (!p)
2101                         goto out_resource;
2102                 *p++ = cpu_to_be32(3);
2103                 *p++ = cpu_to_be32(bmval0);
2104                 *p++ = cpu_to_be32(bmval1);
2105                 *p++ = cpu_to_be32(bmval2);
2106         } else if (bmval1) {
2107                 p = xdr_reserve_space(xdr, 12);
2108                 if (!p)
2109                         goto out_resource;
2110                 *p++ = cpu_to_be32(2);
2111                 *p++ = cpu_to_be32(bmval0);
2112                 *p++ = cpu_to_be32(bmval1);
2113         } else {
2114                 p = xdr_reserve_space(xdr, 8);
2115                 if (!p)
2116                         goto out_resource;
2117                 *p++ = cpu_to_be32(1);
2118                 *p++ = cpu_to_be32(bmval0);
2119         }
2120
2121         attrlen_offset = xdr->buf->len;
2122         p = xdr_reserve_space(xdr, 4);
2123         if (!p)
2124                 goto out_resource;
2125         p++;                /* to be backfilled later */
2126
2127         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2128                 u32 word0 = nfsd_suppattrs0(minorversion);
2129                 u32 word1 = nfsd_suppattrs1(minorversion);
2130                 u32 word2 = nfsd_suppattrs2(minorversion);
2131
2132                 if (!aclsupport)
2133                         word0 &= ~FATTR4_WORD0_ACL;
2134                 if (!contextsupport)
2135                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2136                 if (!word2) {
2137                         p = xdr_reserve_space(xdr, 12);
2138                         if (!p)
2139                                 goto out_resource;
2140                         *p++ = cpu_to_be32(2);
2141                         *p++ = cpu_to_be32(word0);
2142                         *p++ = cpu_to_be32(word1);
2143                 } else {
2144                         p = xdr_reserve_space(xdr, 16);
2145                         if (!p)
2146                                 goto out_resource;
2147                         *p++ = cpu_to_be32(3);
2148                         *p++ = cpu_to_be32(word0);
2149                         *p++ = cpu_to_be32(word1);
2150                         *p++ = cpu_to_be32(word2);
2151                 }
2152         }
2153         if (bmval0 & FATTR4_WORD0_TYPE) {
2154                 p = xdr_reserve_space(xdr, 4);
2155                 if (!p)
2156                         goto out_resource;
2157                 dummy = nfs4_file_type(stat.mode);
2158                 if (dummy == NF4BAD) {
2159                         status = nfserr_serverfault;
2160                         goto out;
2161                 }
2162                 *p++ = cpu_to_be32(dummy);
2163         }
2164         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2165                 p = xdr_reserve_space(xdr, 4);
2166                 if (!p)
2167                         goto out_resource;
2168                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2169                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2170                 else
2171                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2172                                                 NFS4_FH_VOL_RENAME);
2173         }
2174         if (bmval0 & FATTR4_WORD0_CHANGE) {
2175                 p = xdr_reserve_space(xdr, 8);
2176                 if (!p)
2177                         goto out_resource;
2178                 p = encode_change(p, &stat, dentry->d_inode);
2179         }
2180         if (bmval0 & FATTR4_WORD0_SIZE) {
2181                 p = xdr_reserve_space(xdr, 8);
2182                 if (!p)
2183                         goto out_resource;
2184                 p = xdr_encode_hyper(p, stat.size);
2185         }
2186         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2187                 p = xdr_reserve_space(xdr, 4);
2188                 if (!p)
2189                         goto out_resource;
2190                 *p++ = cpu_to_be32(1);
2191         }
2192         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2193                 p = xdr_reserve_space(xdr, 4);
2194                 if (!p)
2195                         goto out_resource;
2196                 *p++ = cpu_to_be32(1);
2197         }
2198         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2199                 p = xdr_reserve_space(xdr, 4);
2200                 if (!p)
2201                         goto out_resource;
2202                 *p++ = cpu_to_be32(0);
2203         }
2204         if (bmval0 & FATTR4_WORD0_FSID) {
2205                 p = xdr_reserve_space(xdr, 16);
2206                 if (!p)
2207                         goto out_resource;
2208                 if (exp->ex_fslocs.migrated) {
2209                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2210                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2211                 } else switch(fsid_source(fhp)) {
2212                 case FSIDSOURCE_FSID:
2213                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2214                         p = xdr_encode_hyper(p, (u64)0);
2215                         break;
2216                 case FSIDSOURCE_DEV:
2217                         *p++ = cpu_to_be32(0);
2218                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2219                         *p++ = cpu_to_be32(0);
2220                         *p++ = cpu_to_be32(MINOR(stat.dev));
2221                         break;
2222                 case FSIDSOURCE_UUID:
2223                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2224                                                                 EX_UUID_LEN);
2225                         break;
2226                 }
2227         }
2228         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2229                 p = xdr_reserve_space(xdr, 4);
2230                 if (!p)
2231                         goto out_resource;
2232                 *p++ = cpu_to_be32(0);
2233         }
2234         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2235                 p = xdr_reserve_space(xdr, 4);
2236                 if (!p)
2237                         goto out_resource;
2238                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2239         }
2240         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2241                 p = xdr_reserve_space(xdr, 4);
2242                 if (!p)
2243                         goto out_resource;
2244                 *p++ = cpu_to_be32(rdattr_err);
2245         }
2246         if (bmval0 & FATTR4_WORD0_ACL) {
2247                 struct nfs4_ace *ace;
2248
2249                 if (acl == NULL) {
2250                         p = xdr_reserve_space(xdr, 4);
2251                         if (!p)
2252                                 goto out_resource;
2253
2254                         *p++ = cpu_to_be32(0);
2255                         goto out_acl;
2256                 }
2257                 p = xdr_reserve_space(xdr, 4);
2258                 if (!p)
2259                         goto out_resource;
2260                 *p++ = cpu_to_be32(acl->naces);
2261
2262                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2263                         p = xdr_reserve_space(xdr, 4*3);
2264                         if (!p)
2265                                 goto out_resource;
2266                         *p++ = cpu_to_be32(ace->type);
2267                         *p++ = cpu_to_be32(ace->flag);
2268                         *p++ = cpu_to_be32(ace->access_mask &
2269                                                         NFS4_ACE_MASK_ALL);
2270                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2271                         if (status)
2272                                 goto out;
2273                 }
2274         }
2275 out_acl:
2276         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2277                 p = xdr_reserve_space(xdr, 4);
2278                 if (!p)
2279                         goto out_resource;
2280                 *p++ = cpu_to_be32(aclsupport ?
2281                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2282         }
2283         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2284                 p = xdr_reserve_space(xdr, 4);
2285                 if (!p)
2286                         goto out_resource;
2287                 *p++ = cpu_to_be32(1);
2288         }
2289         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2290                 p = xdr_reserve_space(xdr, 4);
2291                 if (!p)
2292                         goto out_resource;
2293                 *p++ = cpu_to_be32(0);
2294         }
2295         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2296                 p = xdr_reserve_space(xdr, 4);
2297                 if (!p)
2298                         goto out_resource;
2299                 *p++ = cpu_to_be32(1);
2300         }
2301         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2302                 p = xdr_reserve_space(xdr, 4);
2303                 if (!p)
2304                         goto out_resource;
2305                 *p++ = cpu_to_be32(1);
2306         }
2307         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2308                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2309                 if (!p)
2310                         goto out_resource;
2311                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2312                                         fhp->fh_handle.fh_size);
2313         }
2314         if (bmval0 & FATTR4_WORD0_FILEID) {
2315                 p = xdr_reserve_space(xdr, 8);
2316                 if (!p)
2317                         goto out_resource;
2318                 p = xdr_encode_hyper(p, stat.ino);
2319         }
2320         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2321                 p = xdr_reserve_space(xdr, 8);
2322                 if (!p)
2323                         goto out_resource;
2324                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2325         }
2326         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2327                 p = xdr_reserve_space(xdr, 8);
2328                 if (!p)
2329                         goto out_resource;
2330                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2331         }
2332         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2333                 p = xdr_reserve_space(xdr, 8);
2334                 if (!p)
2335                         goto out_resource;
2336                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2337         }
2338         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2339                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2340                 if (status)
2341                         goto out;
2342         }
2343         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2344                 p = xdr_reserve_space(xdr, 4);
2345                 if (!p)
2346                         goto out_resource;
2347                 *p++ = cpu_to_be32(1);
2348         }
2349         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2350                 p = xdr_reserve_space(xdr, 8);
2351                 if (!p)
2352                         goto out_resource;
2353                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2354         }
2355         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2356                 p = xdr_reserve_space(xdr, 4);
2357                 if (!p)
2358                         goto out_resource;
2359                 *p++ = cpu_to_be32(255);
2360         }
2361         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2362                 p = xdr_reserve_space(xdr, 4);
2363                 if (!p)
2364                         goto out_resource;
2365                 *p++ = cpu_to_be32(statfs.f_namelen);
2366         }
2367         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2368                 p = xdr_reserve_space(xdr, 8);
2369                 if (!p)
2370                         goto out_resource;
2371                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2372         }
2373         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2374                 p = xdr_reserve_space(xdr, 8);
2375                 if (!p)
2376                         goto out_resource;
2377                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2378         }
2379         if (bmval1 & FATTR4_WORD1_MODE) {
2380                 p = xdr_reserve_space(xdr, 4);
2381                 if (!p)
2382                         goto out_resource;
2383                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2384         }
2385         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2386                 p = xdr_reserve_space(xdr, 4);
2387                 if (!p)
2388                         goto out_resource;
2389                 *p++ = cpu_to_be32(1);
2390         }
2391         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2392                 p = xdr_reserve_space(xdr, 4);
2393                 if (!p)
2394                         goto out_resource;
2395                 *p++ = cpu_to_be32(stat.nlink);
2396         }
2397         if (bmval1 & FATTR4_WORD1_OWNER) {
2398                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2399                 if (status)
2400                         goto out;
2401         }
2402         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2403                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2404                 if (status)
2405                         goto out;
2406         }
2407         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2408                 p = xdr_reserve_space(xdr, 8);
2409                 if (!p)
2410                         goto out_resource;
2411                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2412                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2413         }
2414         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2415                 p = xdr_reserve_space(xdr, 8);
2416                 if (!p)
2417                         goto out_resource;
2418                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2419                 p = xdr_encode_hyper(p, dummy64);
2420         }
2421         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2422                 p = xdr_reserve_space(xdr, 8);
2423                 if (!p)
2424                         goto out_resource;
2425                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2426                 p = xdr_encode_hyper(p, dummy64);
2427         }
2428         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2429                 p = xdr_reserve_space(xdr, 8);
2430                 if (!p)
2431                         goto out_resource;
2432                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2433                 p = xdr_encode_hyper(p, dummy64);
2434         }
2435         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2436                 p = xdr_reserve_space(xdr, 8);
2437                 if (!p)
2438                         goto out_resource;
2439                 dummy64 = (u64)stat.blocks << 9;
2440                 p = xdr_encode_hyper(p, dummy64);
2441         }
2442         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2443                 p = xdr_reserve_space(xdr, 12);
2444                 if (!p)
2445                         goto out_resource;
2446                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2447                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2448         }
2449         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2450                 p = xdr_reserve_space(xdr, 12);
2451                 if (!p)
2452                         goto out_resource;
2453                 *p++ = cpu_to_be32(0);
2454                 *p++ = cpu_to_be32(1);
2455                 *p++ = cpu_to_be32(0);
2456         }
2457         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2458                 p = xdr_reserve_space(xdr, 12);
2459                 if (!p)
2460                         goto out_resource;
2461                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2462                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2463         }
2464         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2465                 p = xdr_reserve_space(xdr, 12);
2466                 if (!p)
2467                         goto out_resource;
2468                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2469                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2470         }
2471         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2472                 p = xdr_reserve_space(xdr, 8);
2473                 if (!p)
2474                         goto out_resource;
2475                 /*
2476                  * Get parent's attributes if not ignoring crossmount
2477                  * and this is the root of a cross-mounted filesystem.
2478                  */
2479                 if (ignore_crossmnt == 0 &&
2480                     dentry == exp->ex_path.mnt->mnt_root)
2481                         get_parent_attributes(exp, &stat);
2482                 p = xdr_encode_hyper(p, stat.ino);
2483         }
2484         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2485                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2486                                                                 contextlen);
2487                 if (status)
2488                         goto out;
2489         }
2490         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2491                 p = xdr_reserve_space(xdr, 16);
2492                 if (!p)
2493                         goto out_resource;
2494                 *p++ = cpu_to_be32(3);
2495                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2496                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2497                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2498         }
2499
2500         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2501         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2502         status = nfs_ok;
2503
2504 out:
2505 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2506         if (context)
2507                 security_release_secctx(context, contextlen);
2508 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2509         kfree(acl);
2510         if (tempfh) {
2511                 fh_put(tempfh);
2512                 kfree(tempfh);
2513         }
2514         if (status)
2515                 xdr_truncate_encode(xdr, starting_len);
2516         return status;
2517 out_nfserr:
2518         status = nfserrno(err);
2519         goto out;
2520 out_resource:
2521         status = nfserr_resource;
2522         goto out;
2523 }
2524
2525 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2526                                 struct xdr_buf *buf, __be32 *p, int bytes)
2527 {
2528         xdr->scratch.iov_len = 0;
2529         memset(buf, 0, sizeof(struct xdr_buf));
2530         buf->head[0].iov_base = p;
2531         buf->head[0].iov_len = 0;
2532         buf->len = 0;
2533         xdr->buf = buf;
2534         xdr->iov = buf->head;
2535         xdr->p = p;
2536         xdr->end = (void *)p + bytes;
2537         buf->buflen = bytes;
2538 }
2539
2540 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2541                         struct svc_fh *fhp, struct svc_export *exp,
2542                         struct dentry *dentry, u32 *bmval,
2543                         struct svc_rqst *rqstp, int ignore_crossmnt)
2544 {
2545         struct xdr_buf dummy;
2546         struct xdr_stream xdr;
2547         __be32 ret;
2548
2549         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2550         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2551                                                         ignore_crossmnt);
2552         *p = xdr.p;
2553         return ret;
2554 }
2555
2556 static inline int attributes_need_mount(u32 *bmval)
2557 {
2558         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2559                 return 1;
2560         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2561                 return 1;
2562         return 0;
2563 }
2564
2565 static __be32
2566 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2567                         const char *name, int namlen)
2568 {
2569         struct svc_export *exp = cd->rd_fhp->fh_export;
2570         struct dentry *dentry;
2571         __be32 nfserr;
2572         int ignore_crossmnt = 0;
2573
2574         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2575         if (IS_ERR(dentry))
2576                 return nfserrno(PTR_ERR(dentry));
2577         if (!dentry->d_inode) {
2578                 /*
2579                  * nfsd_buffered_readdir drops the i_mutex between
2580                  * readdir and calling this callback, leaving a window
2581                  * where this directory entry could have gone away.
2582                  */
2583                 dput(dentry);
2584                 return nfserr_noent;
2585         }
2586
2587         exp_get(exp);
2588         /*
2589          * In the case of a mountpoint, the client may be asking for
2590          * attributes that are only properties of the underlying filesystem
2591          * as opposed to the cross-mounted file system. In such a case,
2592          * we will not follow the cross mount and will fill the attribtutes
2593          * directly from the mountpoint dentry.
2594          */
2595         if (nfsd_mountpoint(dentry, exp)) {
2596                 int err;
2597
2598                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2599                                 && !attributes_need_mount(cd->rd_bmval)) {
2600                         ignore_crossmnt = 1;
2601                         goto out_encode;
2602                 }
2603                 /*
2604                  * Why the heck aren't we just using nfsd_lookup??
2605                  * Different "."/".." handling?  Something else?
2606                  * At least, add a comment here to explain....
2607                  */
2608                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2609                 if (err) {
2610                         nfserr = nfserrno(err);
2611                         goto out_put;
2612                 }
2613                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2614                 if (nfserr)
2615                         goto out_put;
2616
2617         }
2618 out_encode:
2619         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2620                                         cd->rd_rqstp, ignore_crossmnt);
2621 out_put:
2622         dput(dentry);
2623         exp_put(exp);
2624         return nfserr;
2625 }
2626
2627 static __be32 *
2628 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2629 {
2630         __be32 *p;
2631
2632         p = xdr_reserve_space(xdr, 20);
2633         if (!p)
2634                 return NULL;
2635         *p++ = htonl(2);
2636         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2637         *p++ = htonl(0);                         /* bmval1 */
2638
2639         *p++ = htonl(4);     /* attribute length */
2640         *p++ = nfserr;       /* no htonl */
2641         return p;
2642 }
2643
2644 static int
2645 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2646                     loff_t offset, u64 ino, unsigned int d_type)
2647 {
2648         struct readdir_cd *ccd = ccdv;
2649         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2650         struct xdr_stream *xdr = cd->xdr;
2651         int start_offset = xdr->buf->len;
2652         int cookie_offset;
2653         int entry_bytes;
2654         __be32 nfserr = nfserr_toosmall;
2655         __be64 wire_offset;
2656         __be32 *p;
2657
2658         /* In nfsv4, "." and ".." never make it onto the wire.. */
2659         if (name && isdotent(name, namlen)) {
2660                 cd->common.err = nfs_ok;
2661                 return 0;
2662         }
2663
2664         if (cd->cookie_offset) {
2665                 wire_offset = cpu_to_be64(offset);
2666                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2667                                                         &wire_offset, 8);
2668         }
2669
2670         p = xdr_reserve_space(xdr, 4);
2671         if (!p)
2672                 goto fail;
2673         *p++ = xdr_one;                             /* mark entry present */
2674         cookie_offset = xdr->buf->len;
2675         p = xdr_reserve_space(xdr, 3*4 + namlen);
2676         if (!p)
2677                 goto fail;
2678         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2679         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2680
2681         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2682         switch (nfserr) {
2683         case nfs_ok:
2684                 break;
2685         case nfserr_resource:
2686                 nfserr = nfserr_toosmall;
2687                 goto fail;
2688         case nfserr_noent:
2689                 xdr_truncate_encode(xdr, start_offset);
2690                 goto skip_entry;
2691         default:
2692                 /*
2693                  * If the client requested the RDATTR_ERROR attribute,
2694                  * we stuff the error code into this attribute
2695                  * and continue.  If this attribute was not requested,
2696                  * then in accordance with the spec, we fail the
2697                  * entire READDIR operation(!)
2698                  */
2699                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2700                         goto fail;
2701                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2702                 if (p == NULL) {
2703                         nfserr = nfserr_toosmall;
2704                         goto fail;
2705                 }
2706         }
2707         nfserr = nfserr_toosmall;
2708         entry_bytes = xdr->buf->len - start_offset;
2709         if (entry_bytes > cd->rd_maxcount)
2710                 goto fail;
2711         cd->rd_maxcount -= entry_bytes;
2712         if (!cd->rd_dircount)
2713                 goto fail;
2714         cd->rd_dircount--;
2715         cd->cookie_offset = cookie_offset;
2716 skip_entry:
2717         cd->common.err = nfs_ok;
2718         return 0;
2719 fail:
2720         xdr_truncate_encode(xdr, start_offset);
2721         cd->common.err = nfserr;
2722         return -EINVAL;
2723 }
2724
2725 static __be32
2726 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2727 {
2728         __be32 *p;
2729
2730         p = xdr_reserve_space(xdr, sizeof(stateid_t));
2731         if (!p)
2732                 return nfserr_resource;
2733         *p++ = cpu_to_be32(sid->si_generation);
2734         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
2735                                         sizeof(stateid_opaque_t));
2736         return 0;
2737 }
2738
2739 static __be32
2740 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2741 {
2742         struct xdr_stream *xdr = &resp->xdr;
2743         __be32 *p;
2744
2745         if (!nfserr) {
2746                 p = xdr_reserve_space(xdr, 8);
2747                 if (!p)
2748                         return nfserr_resource;
2749                 *p++ = cpu_to_be32(access->ac_supported);
2750                 *p++ = cpu_to_be32(access->ac_resp_access);
2751         }
2752         return nfserr;
2753 }
2754
2755 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2756 {
2757         struct xdr_stream *xdr = &resp->xdr;
2758         __be32 *p;
2759
2760         if (!nfserr) {
2761                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
2762                 if (!p)
2763                         return nfserr_resource;
2764                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
2765                                                 NFS4_MAX_SESSIONID_LEN);
2766                 *p++ = cpu_to_be32(bcts->dir);
2767                 /* Sorry, we do not yet support RDMA over 4.1: */
2768                 *p++ = cpu_to_be32(0);
2769         }
2770         return nfserr;
2771 }
2772
2773 static __be32
2774 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2775 {
2776         struct xdr_stream *xdr = &resp->xdr;
2777
2778         if (!nfserr)
2779                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2780
2781         return nfserr;
2782 }
2783
2784
2785 static __be32
2786 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2787 {
2788         struct xdr_stream *xdr = &resp->xdr;
2789         __be32 *p;
2790
2791         if (!nfserr) {
2792                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
2793                 if (!p)
2794                         return nfserr_resource;
2795                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
2796                                                 NFS4_VERIFIER_SIZE);
2797         }
2798         return nfserr;
2799 }
2800
2801 static __be32
2802 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2803 {
2804         struct xdr_stream *xdr = &resp->xdr;
2805         __be32 *p;
2806
2807         if (!nfserr) {
2808                 p = xdr_reserve_space(xdr, 32);
2809                 if (!p)
2810                         return nfserr_resource;
2811                 p = encode_cinfo(p, &create->cr_cinfo);
2812                 *p++ = cpu_to_be32(2);
2813                 *p++ = cpu_to_be32(create->cr_bmval[0]);
2814                 *p++ = cpu_to_be32(create->cr_bmval[1]);
2815         }
2816         return nfserr;
2817 }
2818
2819 static __be32
2820 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2821 {
2822         struct svc_fh *fhp = getattr->ga_fhp;
2823         struct xdr_stream *xdr = &resp->xdr;
2824
2825         if (nfserr)
2826                 return nfserr;
2827
2828         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
2829                                     getattr->ga_bmval,
2830                                     resp->rqstp, 0);
2831         return nfserr;
2832 }
2833
2834 static __be32
2835 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2836 {
2837         struct xdr_stream *xdr = &resp->xdr;
2838         struct svc_fh *fhp = *fhpp;
2839         unsigned int len;
2840         __be32 *p;
2841
2842         if (!nfserr) {
2843                 len = fhp->fh_handle.fh_size;
2844                 p = xdr_reserve_space(xdr, len + 4);
2845                 if (!p)
2846                         return nfserr_resource;
2847                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
2848         }
2849         return nfserr;
2850 }
2851
2852 /*
2853 * Including all fields other than the name, a LOCK4denied structure requires
2854 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2855 */
2856 static __be32
2857 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
2858 {
2859         struct xdr_netobj *conf = &ld->ld_owner;
2860         __be32 *p;
2861
2862 again:
2863         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2864         if (!p) {
2865                 /*
2866                  * Don't fail to return the result just because we can't
2867                  * return the conflicting open:
2868                  */
2869                 if (conf->len) {
2870                         kfree(conf->data);
2871                         conf->len = 0;
2872                         conf->data = NULL;
2873                         goto again;
2874                 }
2875                 return nfserr_resource;
2876         }
2877         p = xdr_encode_hyper(p, ld->ld_start);
2878         p = xdr_encode_hyper(p, ld->ld_length);
2879         *p++ = cpu_to_be32(ld->ld_type);
2880         if (conf->len) {
2881                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
2882                 p = xdr_encode_opaque(p, conf->data, conf->len);
2883                 kfree(conf->data);
2884         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2885                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
2886                 *p++ = cpu_to_be32(0); /* length of owner name */
2887         }
2888         return nfserr_denied;
2889 }
2890
2891 static __be32
2892 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2893 {
2894         struct xdr_stream *xdr = &resp->xdr;
2895
2896         if (!nfserr)
2897                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2898         else if (nfserr == nfserr_denied)
2899                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2900
2901         return nfserr;
2902 }
2903
2904 static __be32
2905 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2906 {
2907         struct xdr_stream *xdr = &resp->xdr;
2908
2909         if (nfserr == nfserr_denied)
2910                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2911         return nfserr;
2912 }
2913
2914 static __be32
2915 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2916 {
2917         struct xdr_stream *xdr = &resp->xdr;
2918
2919         if (!nfserr)
2920                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2921
2922         return nfserr;
2923 }
2924
2925
2926 static __be32
2927 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2928 {
2929         struct xdr_stream *xdr = &resp->xdr;
2930         __be32 *p;
2931
2932         if (!nfserr) {
2933                 p = xdr_reserve_space(xdr, 20);
2934                 if (!p)
2935                         return nfserr_resource;
2936                 p = encode_cinfo(p, &link->li_cinfo);
2937         }
2938         return nfserr;
2939 }
2940
2941
2942 static __be32
2943 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2944 {
2945         struct xdr_stream *xdr = &resp->xdr;
2946         __be32 *p;
2947
2948         if (nfserr)
2949                 goto out;
2950
2951         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
2952         if (nfserr)
2953                 goto out;
2954         p = xdr_reserve_space(xdr, 40);
2955         if (!p)
2956                 return nfserr_resource;
2957         p = encode_cinfo(p, &open->op_cinfo);
2958         *p++ = cpu_to_be32(open->op_rflags);
2959         *p++ = cpu_to_be32(2);
2960         *p++ = cpu_to_be32(open->op_bmval[0]);
2961         *p++ = cpu_to_be32(open->op_bmval[1]);
2962         *p++ = cpu_to_be32(open->op_delegate_type);
2963
2964         switch (open->op_delegate_type) {
2965         case NFS4_OPEN_DELEGATE_NONE:
2966                 break;
2967         case NFS4_OPEN_DELEGATE_READ:
2968                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
2969                 if (nfserr)
2970                         return nfserr;
2971                 p = xdr_reserve_space(xdr, 20);
2972                 if (!p)
2973                         return nfserr_resource;
2974                 *p++ = cpu_to_be32(open->op_recall);
2975
2976                 /*
2977                  * TODO: ACE's in delegations
2978                  */
2979                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2980                 *p++ = cpu_to_be32(0);
2981                 *p++ = cpu_to_be32(0);
2982                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
2983                 break;
2984         case NFS4_OPEN_DELEGATE_WRITE:
2985                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
2986                 if (nfserr)
2987                         return nfserr;
2988                 p = xdr_reserve_space(xdr, 32);
2989                 if (!p)
2990                         return nfserr_resource;
2991                 *p++ = cpu_to_be32(0);
2992
2993                 /*
2994                  * TODO: space_limit's in delegations
2995                  */
2996                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
2997                 *p++ = cpu_to_be32(~(u32)0);
2998                 *p++ = cpu_to_be32(~(u32)0);
2999
3000                 /*
3001                  * TODO: ACE's in delegations
3002                  */
3003                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3004                 *p++ = cpu_to_be32(0);
3005                 *p++ = cpu_to_be32(0);
3006                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3007                 break;
3008         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3009                 switch (open->op_why_no_deleg) {
3010                 case WND4_CONTENTION:
3011                 case WND4_RESOURCE:
3012                         p = xdr_reserve_space(xdr, 8);
3013                         if (!p)
3014                                 return nfserr_resource;
3015                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3016                         /* deleg signaling not supported yet: */
3017                         *p++ = cpu_to_be32(0);
3018                         break;
3019                 default:
3020                         p = xdr_reserve_space(xdr, 4);
3021                         if (!p)
3022                                 return nfserr_resource;
3023                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3024                 }
3025                 break;
3026         default:
3027                 BUG();
3028         }
3029         /* XXX save filehandle here */
3030 out:
3031         return nfserr;
3032 }
3033
3034 static __be32
3035 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3036 {
3037         struct xdr_stream *xdr = &resp->xdr;
3038
3039         if (!nfserr)
3040                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3041
3042         return nfserr;
3043 }
3044
3045 static __be32
3046 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3047 {
3048         struct xdr_stream *xdr = &resp->xdr;
3049
3050         if (!nfserr)
3051                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3052
3053         return nfserr;
3054 }
3055
3056 static __be32 nfsd4_encode_splice_read(
3057                                 struct nfsd4_compoundres *resp,
3058                                 struct nfsd4_read *read,
3059                                 struct file *file, unsigned long maxcount)
3060 {
3061         struct xdr_stream *xdr = &resp->xdr;
3062         struct xdr_buf *buf = xdr->buf;
3063         u32 eof;
3064         int space_left;
3065         __be32 nfserr;
3066         __be32 *p = xdr->p - 2;
3067
3068         /* Make sure there will be room for padding if needed */
3069         if (xdr->end - xdr->p < 1)
3070                 return nfserr_resource;
3071
3072         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3073                                   read->rd_offset, &maxcount);
3074         if (nfserr) {
3075                 /*
3076                  * nfsd_splice_actor may have already messed with the
3077                  * page length; reset it so as not to confuse
3078                  * xdr_truncate_encode:
3079                  */
3080                 buf->page_len = 0;
3081                 return nfserr;
3082         }
3083
3084         eof = (read->rd_offset + maxcount >=
3085                read->rd_fhp->fh_dentry->d_inode->i_size);
3086
3087         *(p++) = htonl(eof);
3088         *(p++) = htonl(maxcount);
3089
3090         buf->page_len = maxcount;
3091         buf->len += maxcount;
3092         xdr->page_ptr += (maxcount + PAGE_SIZE - 1) / PAGE_SIZE;
3093
3094         /* Use rest of head for padding and remaining ops: */
3095         buf->tail[0].iov_base = xdr->p;
3096         buf->tail[0].iov_len = 0;
3097         xdr->iov = buf->tail;
3098         if (maxcount&3) {
3099                 int pad = 4 - (maxcount&3);
3100
3101                 *(xdr->p++) = 0;
3102
3103                 buf->tail[0].iov_base += maxcount&3;
3104                 buf->tail[0].iov_len = pad;
3105                 buf->len += pad;
3106         }
3107
3108         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3109                                 buf->buflen - buf->len);
3110         buf->buflen = buf->len + space_left;
3111         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3112
3113         return 0;
3114 }
3115
3116 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3117                                  struct nfsd4_read *read,
3118                                  struct file *file, unsigned long maxcount)
3119 {
3120         struct xdr_stream *xdr = &resp->xdr;
3121         u32 eof;
3122         int v;
3123         int starting_len = xdr->buf->len - 8;
3124         long len;
3125         int thislen;
3126         __be32 nfserr;
3127         __be32 tmp;
3128         __be32 *p;
3129         u32 zzz = 0;
3130         int pad;
3131
3132         len = maxcount;
3133         v = 0;
3134
3135         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3136         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3137         WARN_ON_ONCE(!p);
3138         resp->rqstp->rq_vec[v].iov_base = p;
3139         resp->rqstp->rq_vec[v].iov_len = thislen;
3140         v++;
3141         len -= thislen;
3142
3143         while (len) {
3144                 thislen = min_t(long, len, PAGE_SIZE);
3145                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3146                 WARN_ON_ONCE(!p);
3147                 resp->rqstp->rq_vec[v].iov_base = p;
3148                 resp->rqstp->rq_vec[v].iov_len = thislen;
3149                 v++;
3150                 len -= thislen;
3151         }
3152         read->rd_vlen = v;
3153
3154         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3155                         read->rd_vlen, &maxcount);
3156         if (nfserr)
3157                 return nfserr;
3158         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3159
3160         eof = (read->rd_offset + maxcount >=
3161                read->rd_fhp->fh_dentry->d_inode->i_size);
3162
3163         tmp = htonl(eof);
3164         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3165         tmp = htonl(maxcount);
3166         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3167
3168         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3169         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3170                                                                 &zzz, pad);
3171         return 0;
3172
3173 }
3174
3175 static __be32
3176 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3177                   struct nfsd4_read *read)
3178 {
3179         unsigned long maxcount;
3180         struct xdr_stream *xdr = &resp->xdr;
3181         struct file *file = read->rd_filp;
3182         int starting_len = xdr->buf->len;
3183         struct raparms *ra;
3184         __be32 *p;
3185         __be32 err;
3186
3187         if (nfserr)
3188                 return nfserr;
3189
3190         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3191         if (!p) {
3192                 WARN_ON_ONCE(resp->rqstp->rq_splice_ok);
3193                 return nfserr_resource;
3194         }
3195         if (resp->xdr.buf->page_len && resp->rqstp->rq_splice_ok) {
3196                 WARN_ON_ONCE(1);
3197                 return nfserr_resource;
3198         }
3199         xdr_commit_encode(xdr);
3200
3201         maxcount = svc_max_payload(resp->rqstp);
3202         maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len));
3203         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3204
3205         if (!read->rd_filp) {
3206                 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
3207                                                 &file, &ra);
3208                 if (err)
3209                         goto err_truncate;
3210         }
3211
3212         if (file->f_op->splice_read && resp->rqstp->rq_splice_ok)
3213                 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
3214         else
3215                 err = nfsd4_encode_readv(resp, read, file, maxcount);
3216
3217         if (!read->rd_filp)
3218                 nfsd_put_tmp_read_open(file, ra);
3219
3220 err_truncate:
3221         if (err)
3222                 xdr_truncate_encode(xdr, starting_len);
3223         return err;
3224 }
3225
3226 static __be32
3227 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3228 {
3229         int maxcount;
3230         __be32 wire_count;
3231         int zero = 0;
3232         struct xdr_stream *xdr = &resp->xdr;
3233         int length_offset = xdr->buf->len;
3234         __be32 *p;
3235
3236         if (nfserr)
3237                 return nfserr;
3238
3239         p = xdr_reserve_space(xdr, 4);
3240         if (!p)
3241                 return nfserr_resource;
3242         maxcount = PAGE_SIZE;
3243
3244         p = xdr_reserve_space(xdr, maxcount);
3245         if (!p)
3246                 return nfserr_resource;
3247         /*
3248          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3249          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3250          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3251          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3252          */
3253         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3254                                                 (char *)p, &maxcount);
3255         if (nfserr == nfserr_isdir)
3256                 nfserr = nfserr_inval;
3257         if (nfserr) {
3258                 xdr_truncate_encode(xdr, length_offset);
3259                 return nfserr;
3260         }
3261
3262         wire_count = htonl(maxcount);
3263         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3264         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3265         if (maxcount & 3)
3266                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3267                                                 &zero, 4 - (maxcount&3));
3268         return 0;
3269 }
3270
3271 static __be32
3272 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3273 {
3274         int maxcount;
3275         int bytes_left;
3276         loff_t offset;
3277         __be64 wire_offset;
3278         struct xdr_stream *xdr = &resp->xdr;
3279         int starting_len = xdr->buf->len;
3280         __be32 *p;
3281
3282         if (nfserr)
3283                 return nfserr;
3284
3285         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3286         if (!p)
3287                 return nfserr_resource;
3288
3289         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3290         *p++ = cpu_to_be32(0);
3291         *p++ = cpu_to_be32(0);
3292         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3293                                 - (char *)resp->xdr.buf->head[0].iov_base;
3294
3295         /*
3296          * Number of bytes left for directory entries allowing for the
3297          * final 8 bytes of the readdir and a following failed op:
3298          */
3299         bytes_left = xdr->buf->buflen - xdr->buf->len
3300                         - COMPOUND_ERR_SLACK_SPACE - 8;
3301         if (bytes_left < 0) {
3302                 nfserr = nfserr_resource;
3303                 goto err_no_verf;
3304         }
3305         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3306         /*
3307          * Note the rfc defines rd_maxcount as the size of the
3308          * READDIR4resok structure, which includes the verifier above
3309          * and the 8 bytes encoded at the end of this function:
3310          */
3311         if (maxcount < 16) {
3312                 nfserr = nfserr_toosmall;
3313                 goto err_no_verf;
3314         }
3315         maxcount = min_t(int, maxcount-16, bytes_left);
3316
3317         readdir->xdr = xdr;
3318         readdir->rd_maxcount = maxcount;
3319         readdir->common.err = 0;
3320         readdir->cookie_offset = 0;
3321
3322         offset = readdir->rd_cookie;
3323         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3324                               &offset,
3325                               &readdir->common, nfsd4_encode_dirent);
3326         if (nfserr == nfs_ok &&
3327             readdir->common.err == nfserr_toosmall &&
3328             xdr->buf->len == starting_len + 8) {
3329                 /* nothing encoded; which limit did we hit?: */
3330                 if (maxcount - 16 < bytes_left)
3331                         /* It was the fault of rd_maxcount: */
3332                         nfserr = nfserr_toosmall;
3333                 else
3334                         /* We ran out of buffer space: */
3335                         nfserr = nfserr_resource;
3336         }
3337         if (nfserr)
3338                 goto err_no_verf;
3339
3340         if (readdir->cookie_offset) {
3341                 wire_offset = cpu_to_be64(offset);
3342                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3343                                                         &wire_offset, 8);
3344         }
3345
3346         p = xdr_reserve_space(xdr, 8);
3347         if (!p) {
3348                 WARN_ON_ONCE(1);
3349                 goto err_no_verf;
3350         }
3351         *p++ = 0;       /* no more entries */
3352         *p++ = htonl(readdir->common.err == nfserr_eof);
3353
3354         return 0;
3355 err_no_verf:
3356         xdr_truncate_encode(xdr, starting_len);
3357         return nfserr;
3358 }
3359
3360 static __be32
3361 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3362 {
3363         struct xdr_stream *xdr = &resp->xdr;
3364         __be32 *p;
3365
3366         if (!nfserr) {
3367                 p = xdr_reserve_space(xdr, 20);
3368                 if (!p)
3369                         return nfserr_resource;
3370                 p = encode_cinfo(p, &remove->rm_cinfo);
3371         }
3372         return nfserr;
3373 }
3374
3375 static __be32
3376 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3377 {
3378         struct xdr_stream *xdr = &resp->xdr;
3379         __be32 *p;
3380
3381         if (!nfserr) {
3382                 p = xdr_reserve_space(xdr, 40);
3383                 if (!p)
3384                         return nfserr_resource;
3385                 p = encode_cinfo(p, &rename->rn_sinfo);
3386                 p = encode_cinfo(p, &rename->rn_tinfo);
3387         }
3388         return nfserr;
3389 }
3390
3391 static __be32
3392 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3393                          __be32 nfserr, struct svc_export *exp)
3394 {
3395         u32 i, nflavs, supported;
3396         struct exp_flavor_info *flavs;
3397         struct exp_flavor_info def_flavs[2];
3398         __be32 *p, *flavorsp;
3399         static bool report = true;
3400
3401         if (nfserr)
3402                 goto out;
3403         nfserr = nfserr_resource;
3404         if (exp->ex_nflavors) {
3405                 flavs = exp->ex_flavors;
3406                 nflavs = exp->ex_nflavors;
3407         } else { /* Handling of some defaults in absence of real secinfo: */
3408                 flavs = def_flavs;
3409                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3410                         nflavs = 2;
3411                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3412                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3413                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3414                         nflavs = 1;
3415                         flavs[0].pseudoflavor
3416                                         = svcauth_gss_flavor(exp->ex_client);
3417                 } else {
3418                         nflavs = 1;
3419                         flavs[0].pseudoflavor
3420                                         = exp->ex_client->flavour->flavour;
3421                 }
3422         }
3423
3424         supported = 0;
3425         p = xdr_reserve_space(xdr, 4);
3426         if (!p)
3427                 goto out;
3428         flavorsp = p++;         /* to be backfilled later */
3429
3430         for (i = 0; i < nflavs; i++) {
3431                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3432                 struct rpcsec_gss_info info;
3433
3434                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3435                         supported++;
3436                         p = xdr_reserve_space(xdr, 4 + 4 +
3437                                               XDR_LEN(info.oid.len) + 4 + 4);
3438                         if (!p)
3439                                 goto out;
3440                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3441                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3442                         *p++ = cpu_to_be32(info.qop);
3443                         *p++ = cpu_to_be32(info.service);
3444                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3445                         supported++;
3446                         p = xdr_reserve_space(xdr, 4);
3447                         if (!p)
3448                                 goto out;
3449                         *p++ = cpu_to_be32(pf);
3450                 } else {
3451                         if (report)
3452                                 pr_warn("NFS: SECINFO: security flavor %u "
3453                                         "is not supported\n", pf);
3454                 }
3455         }
3456
3457         if (nflavs != supported)
3458                 report = false;
3459         *flavorsp = htonl(supported);
3460         nfserr = 0;
3461 out:
3462         if (exp)
3463                 exp_put(exp);
3464         return nfserr;
3465 }
3466
3467 static __be32
3468 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3469                      struct nfsd4_secinfo *secinfo)
3470 {
3471         struct xdr_stream *xdr = &resp->xdr;
3472
3473         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3474 }
3475
3476 static __be32
3477 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3478                      struct nfsd4_secinfo_no_name *secinfo)
3479 {
3480         struct xdr_stream *xdr = &resp->xdr;
3481
3482         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3483 }
3484
3485 /*
3486  * The SETATTR encode routine is special -- it always encodes a bitmap,
3487  * regardless of the error status.
3488  */
3489 static __be32
3490 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3491 {
3492         struct xdr_stream *xdr = &resp->xdr;
3493         __be32 *p;
3494
3495         p = xdr_reserve_space(xdr, 16);
3496         if (!p)
3497                 return nfserr_resource;
3498         if (nfserr) {
3499                 *p++ = cpu_to_be32(3);
3500                 *p++ = cpu_to_be32(0);
3501                 *p++ = cpu_to_be32(0);
3502                 *p++ = cpu_to_be32(0);
3503         }
3504         else {
3505                 *p++ = cpu_to_be32(3);
3506                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3507                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3508                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3509         }
3510         return nfserr;
3511 }
3512
3513 static __be32
3514 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3515 {
3516         struct xdr_stream *xdr = &resp->xdr;
3517         __be32 *p;
3518
3519         if (!nfserr) {
3520                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3521                 if (!p)
3522                         return nfserr_resource;
3523                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3524                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3525                                                 NFS4_VERIFIER_SIZE);
3526         }
3527         else if (nfserr == nfserr_clid_inuse) {
3528                 p = xdr_reserve_space(xdr, 8);
3529                 if (!p)
3530                         return nfserr_resource;
3531                 *p++ = cpu_to_be32(0);
3532                 *p++ = cpu_to_be32(0);
3533         }
3534         return nfserr;
3535 }
3536
3537 static __be32
3538 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3539 {
3540         struct xdr_stream *xdr = &resp->xdr;
3541         __be32 *p;
3542
3543         if (!nfserr) {
3544                 p = xdr_reserve_space(xdr, 16);
3545                 if (!p)
3546                         return nfserr_resource;
3547                 *p++ = cpu_to_be32(write->wr_bytes_written);
3548                 *p++ = cpu_to_be32(write->wr_how_written);
3549                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3550                                                         NFS4_VERIFIER_SIZE);
3551         }
3552         return nfserr;
3553 }
3554
3555 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3556         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3557               1 << (OP_EXCHANGE_ID - 32) |
3558               1 << (OP_CREATE_SESSION - 32) |
3559               1 << (OP_DESTROY_SESSION - 32) |
3560               1 << (OP_DESTROY_CLIENTID - 32)
3561 };
3562
3563 static __be32
3564 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3565                          struct nfsd4_exchange_id *exid)
3566 {
3567         struct xdr_stream *xdr = &resp->xdr;
3568         __be32 *p;
3569         char *major_id;
3570         char *server_scope;
3571         int major_id_sz;
3572         int server_scope_sz;
3573         uint64_t minor_id = 0;
3574
3575         if (nfserr)
3576                 return nfserr;
3577
3578         major_id = utsname()->nodename;
3579         major_id_sz = strlen(major_id);
3580         server_scope = utsname()->nodename;
3581         server_scope_sz = strlen(server_scope);
3582
3583         p = xdr_reserve_space(xdr,
3584                 8 /* eir_clientid */ +
3585                 4 /* eir_sequenceid */ +
3586                 4 /* eir_flags */ +
3587                 4 /* spr_how */);
3588         if (!p)
3589                 return nfserr_resource;
3590
3591         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3592         *p++ = cpu_to_be32(exid->seqid);
3593         *p++ = cpu_to_be32(exid->flags);
3594
3595         *p++ = cpu_to_be32(exid->spa_how);
3596
3597         switch (exid->spa_how) {
3598         case SP4_NONE:
3599                 break;
3600         case SP4_MACH_CRED:
3601                 /* spo_must_enforce, spo_must_allow */
3602                 p = xdr_reserve_space(xdr, 16);
3603                 if (!p)
3604                         return nfserr_resource;
3605
3606                 /* spo_must_enforce bitmap: */
3607                 *p++ = cpu_to_be32(2);
3608                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3609                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3610                 /* empty spo_must_allow bitmap: */
3611                 *p++ = cpu_to_be32(0);
3612
3613                 break;
3614         default:
3615                 WARN_ON_ONCE(1);
3616         }
3617
3618         p = xdr_reserve_space(xdr,
3619                 8 /* so_minor_id */ +
3620                 4 /* so_major_id.len */ +
3621                 (XDR_QUADLEN(major_id_sz) * 4) +
3622                 4 /* eir_server_scope.len */ +
3623                 (XDR_QUADLEN(server_scope_sz) * 4) +
3624                 4 /* eir_server_impl_id.count (0) */);
3625         if (!p)
3626                 return nfserr_resource;
3627
3628         /* The server_owner struct */
3629         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3630         /* major id */
3631         p = xdr_encode_opaque(p, major_id, major_id_sz);
3632
3633         /* Server scope */
3634         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3635
3636         /* Implementation id */
3637         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3638         return 0;
3639 }
3640
3641 static __be32
3642 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3643                             struct nfsd4_create_session *sess)
3644 {
3645         struct xdr_stream *xdr = &resp->xdr;
3646         __be32 *p;
3647
3648         if (nfserr)
3649                 return nfserr;
3650
3651         p = xdr_reserve_space(xdr, 24);
3652         if (!p)
3653                 return nfserr_resource;
3654         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3655                                         NFS4_MAX_SESSIONID_LEN);
3656         *p++ = cpu_to_be32(sess->seqid);
3657         *p++ = cpu_to_be32(sess->flags);
3658
3659         p = xdr_reserve_space(xdr, 28);
3660         if (!p)
3661                 return nfserr_resource;
3662         *p++ = cpu_to_be32(0); /* headerpadsz */
3663         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3664         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3665         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3666         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3667         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3668         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3669
3670         if (sess->fore_channel.nr_rdma_attrs) {
3671                 p = xdr_reserve_space(xdr, 4);
3672                 if (!p)
3673                         return nfserr_resource;
3674                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3675         }
3676
3677         p = xdr_reserve_space(xdr, 28);
3678         if (!p)
3679                 return nfserr_resource;
3680         *p++ = cpu_to_be32(0); /* headerpadsz */
3681         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3682         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3683         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3684         *p++ = cpu_to_be32(sess->back_channel.maxops);
3685         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3686         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3687
3688         if (sess->back_channel.nr_rdma_attrs) {
3689                 p = xdr_reserve_space(xdr, 4);
3690                 if (!p)
3691                         return nfserr_resource;
3692                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3693         }
3694         return 0;
3695 }
3696
3697 static __be32
3698 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3699                       struct nfsd4_sequence *seq)
3700 {
3701         struct xdr_stream *xdr = &resp->xdr;
3702         __be32 *p;
3703
3704         if (nfserr)
3705                 return nfserr;
3706
3707         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3708         if (!p)
3709                 return nfserr_resource;
3710         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
3711                                         NFS4_MAX_SESSIONID_LEN);
3712         *p++ = cpu_to_be32(seq->seqid);
3713         *p++ = cpu_to_be32(seq->slotid);
3714         /* Note slotid's are numbered from zero: */
3715         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
3716         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
3717         *p++ = cpu_to_be32(seq->status_flags);
3718
3719         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3720         return 0;
3721 }
3722
3723 static __be32
3724 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3725                           struct nfsd4_test_stateid *test_stateid)
3726 {
3727         struct xdr_stream *xdr = &resp->xdr;
3728         struct nfsd4_test_stateid_id *stateid, *next;
3729         __be32 *p;
3730
3731         if (nfserr)
3732                 return nfserr;
3733
3734         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3735         if (!p)
3736                 return nfserr_resource;
3737         *p++ = htonl(test_stateid->ts_num_ids);
3738
3739         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3740                 *p++ = stateid->ts_id_status;
3741         }
3742
3743         return nfserr;
3744 }
3745
3746 static __be32
3747 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3748 {
3749         return nfserr;
3750 }
3751
3752 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3753
3754 /*
3755  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3756  * since we don't need to filter out obsolete ops as this is
3757  * done in the decoding phase.
3758  */
3759 static nfsd4_enc nfsd4_enc_ops[] = {
3760         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3761         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3762         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3763         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3764         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3765         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3766         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3767         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3768         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3769         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3770         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3771         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3772         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3773         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3774         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3775         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3776         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3777         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3778         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3779         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3780         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3781         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3782         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3783         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3784         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3785         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3786         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3787         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3788         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3789         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3790         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3791         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3792         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3793         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3794         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3795         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3796         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3797
3798         /* NFSv4.1 operations */
3799         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3800         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3801         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3802         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3803         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
3804         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3805         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3806         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3807         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3808         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3809         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3810         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3811         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3812         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3813         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3814         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3815         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3816         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3817         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3818 };
3819
3820 /*
3821  * Calculate whether we still have space to encode repsize bytes.
3822  * There are two considerations:
3823  *     - For NFS versions >=4.1, the size of the reply must stay within
3824  *       session limits
3825  *     - For all NFS versions, we must stay within limited preallocated
3826  *       buffer space.
3827  *
3828  * This is called before the operation is processed, so can only provide
3829  * an upper estimate.  For some nonidempotent operations (such as
3830  * getattr), it's not necessarily a problem if that estimate is wrong,
3831  * as we can fail it after processing without significant side effects.
3832  */
3833 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
3834 {
3835         struct xdr_buf *buf = &resp->rqstp->rq_res;
3836         struct nfsd4_slot *slot = resp->cstate.slot;
3837
3838         if (buf->len + respsize <= buf->buflen)
3839                 return nfs_ok;
3840         if (!nfsd4_has_session(&resp->cstate))
3841                 return nfserr_resource;
3842         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
3843                 WARN_ON_ONCE(1);
3844                 return nfserr_rep_too_big_to_cache;
3845         }
3846         return nfserr_rep_too_big;
3847 }
3848
3849 void
3850 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3851 {
3852         struct xdr_stream *xdr = &resp->xdr;
3853         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3854         struct svc_rqst *rqstp = resp->rqstp;
3855         int post_err_offset;
3856         nfsd4_enc encoder;
3857         __be32 *p;
3858
3859         p = xdr_reserve_space(xdr, 8);
3860         if (!p) {
3861                 WARN_ON_ONCE(1);
3862                 return;
3863         }
3864         *p++ = cpu_to_be32(op->opnum);
3865         post_err_offset = xdr->buf->len;
3866
3867         if (op->opnum == OP_ILLEGAL)
3868                 goto status;
3869         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3870                !nfsd4_enc_ops[op->opnum]);
3871         encoder = nfsd4_enc_ops[op->opnum];
3872         op->status = encoder(resp, op->status, &op->u);
3873         xdr_commit_encode(xdr);
3874
3875         /* nfsd4_check_resp_size guarantees enough room for error status */
3876         if (!op->status) {
3877                 int space_needed = 0;
3878                 if (!nfsd4_last_compound_op(rqstp))
3879                         space_needed = COMPOUND_ERR_SLACK_SPACE;
3880                 op->status = nfsd4_check_resp_size(resp, space_needed);
3881         }
3882         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
3883                 struct nfsd4_slot *slot = resp->cstate.slot;
3884
3885                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
3886                         op->status = nfserr_rep_too_big_to_cache;
3887                 else
3888                         op->status = nfserr_rep_too_big;
3889         }
3890         if (op->status == nfserr_resource ||
3891             op->status == nfserr_rep_too_big ||
3892             op->status == nfserr_rep_too_big_to_cache) {
3893                 /*
3894                  * The operation may have already been encoded or
3895                  * partially encoded.  No op returns anything additional
3896                  * in the case of one of these three errors, so we can
3897                  * just truncate back to after the status.  But it's a
3898                  * bug if we had to do this on a non-idempotent op:
3899                  */
3900                 warn_on_nonidempotent_op(op);
3901                 xdr_truncate_encode(xdr, post_err_offset);
3902         }
3903         if (so) {
3904                 int len = xdr->buf->len - post_err_offset;
3905
3906                 so->so_replay.rp_status = op->status;
3907                 so->so_replay.rp_buflen = len;
3908                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
3909                                                 so->so_replay.rp_buf, len);
3910         }
3911 status:
3912         /* Note that op->status is already in network byte order: */
3913         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
3914 }
3915
3916 /*
3917  * Encode the reply stored in the stateowner reply cache
3918  *
3919  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3920  * previously sent already encoded operation.
3921  */
3922 void
3923 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
3924 {
3925         __be32 *p;
3926         struct nfs4_replay *rp = op->replay;
3927
3928         BUG_ON(!rp);
3929
3930         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
3931         if (!p) {
3932                 WARN_ON_ONCE(1);
3933                 return;
3934         }
3935         *p++ = cpu_to_be32(op->opnum);
3936         *p++ = rp->rp_status;  /* already xdr'ed */
3937
3938         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
3939 }
3940
3941 int
3942 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3943 {
3944         return xdr_ressize_check(rqstp, p);
3945 }
3946
3947 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3948 {
3949         struct svc_rqst *rqstp = rq;
3950         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3951
3952         if (args->ops != args->iops) {
3953                 kfree(args->ops);
3954                 args->ops = args->iops;
3955         }
3956         kfree(args->tmpp);
3957         args->tmpp = NULL;
3958         while (args->to_free) {
3959                 struct svcxdr_tmpbuf *tb = args->to_free;
3960                 args->to_free = tb->next;
3961                 kfree(tb);
3962         }
3963         return 1;
3964 }
3965
3966 int
3967 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3968 {
3969         if (rqstp->rq_arg.head[0].iov_len % 4) {
3970                 /* client is nuts */
3971                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
3972                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
3973                 return 0;
3974         }
3975         args->p = p;
3976         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3977         args->pagelist = rqstp->rq_arg.pages;
3978         args->pagelen = rqstp->rq_arg.page_len;
3979         args->tmpp = NULL;
3980         args->to_free = NULL;
3981         args->ops = args->iops;
3982         args->rqstp = rqstp;
3983
3984         return !nfsd4_decode_compound(args);
3985 }
3986
3987 int
3988 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3989 {
3990         /*
3991          * All that remains is to write the tag and operation count...
3992          */
3993         struct xdr_buf *buf = resp->xdr.buf;
3994
3995         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
3996                                  buf->tail[0].iov_len);
3997
3998         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
3999
4000         p = resp->tagp;
4001         *p++ = htonl(resp->taglen);
4002         memcpy(p, resp->tag, resp->taglen);
4003         p += XDR_QUADLEN(resp->taglen);
4004         *p++ = htonl(resp->opcnt);
4005
4006         nfsd4_sequence_done(resp);
4007         return 1;
4008 }
4009
4010 /*
4011  * Local variables:
4012  *  c-basic-offset: 8
4013  * End:
4014  */