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_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1518 {
1519         DECODE_HEAD;
1520
1521         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1522         if (status)
1523                 return status;
1524
1525         READ_BUF(8 + 4);
1526         p = xdr_decode_hyper(p, &seek->seek_offset);
1527         seek->seek_whence = be32_to_cpup(p);
1528
1529         DECODE_TAIL;
1530 }
1531
1532 static __be32
1533 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1534 {
1535         return nfs_ok;
1536 }
1537
1538 static __be32
1539 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1540 {
1541         return nfserr_notsupp;
1542 }
1543
1544 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1545
1546 static nfsd4_dec nfsd4_dec_ops[] = {
1547         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1548         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1549         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1550         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1551         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1552         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1553         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1554         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1555         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1556         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1557         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1558         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1559         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1560         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1561         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1562         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1563         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1564         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1565         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1566         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1567         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1568         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1569         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1570         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1571         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1572         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1573         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1574         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1575         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1576         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1577         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1578         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1579         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1580         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1581         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1582         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1583         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1584
1585         /* new operations for NFSv4.1 */
1586         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1587         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1588         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1589         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1590         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1591         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1592         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1593         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1594         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1595         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1596         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1597         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1598         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1599         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1600         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1601         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1602         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1603         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1604         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1605
1606         /* new operations for NFSv4.2 */
1607         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_notsupp,
1608         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_notsupp,
1609         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1610         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1611         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1612         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1613         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1614         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1615         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1616         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1617         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1618         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1619 };
1620
1621 static inline bool
1622 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1623 {
1624         if (op->opnum < FIRST_NFS4_OP)
1625                 return false;
1626         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1627                 return false;
1628         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1629                 return false;
1630         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1631                 return false;
1632         return true;
1633 }
1634
1635 static __be32
1636 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1637 {
1638         DECODE_HEAD;
1639         struct nfsd4_op *op;
1640         bool cachethis = false;
1641         int auth_slack= argp->rqstp->rq_auth_slack;
1642         int max_reply = auth_slack + 8; /* opcnt, status */
1643         int readcount = 0;
1644         int readbytes = 0;
1645         int i;
1646
1647         READ_BUF(4);
1648         argp->taglen = be32_to_cpup(p++);
1649         READ_BUF(argp->taglen + 8);
1650         SAVEMEM(argp->tag, argp->taglen);
1651         argp->minorversion = be32_to_cpup(p++);
1652         argp->opcnt = be32_to_cpup(p++);
1653         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1654
1655         if (argp->taglen > NFSD4_MAX_TAGLEN)
1656                 goto xdr_error;
1657         if (argp->opcnt > 100)
1658                 goto xdr_error;
1659
1660         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1661                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1662                 if (!argp->ops) {
1663                         argp->ops = argp->iops;
1664                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1665                         goto xdr_error;
1666                 }
1667         }
1668
1669         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1670                 argp->opcnt = 0;
1671
1672         for (i = 0; i < argp->opcnt; i++) {
1673                 op = &argp->ops[i];
1674                 op->replay = NULL;
1675
1676                 READ_BUF(4);
1677                 op->opnum = be32_to_cpup(p++);
1678
1679                 if (nfsd4_opnum_in_range(argp, op))
1680                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1681                 else {
1682                         op->opnum = OP_ILLEGAL;
1683                         op->status = nfserr_op_illegal;
1684                 }
1685                 /*
1686                  * We'll try to cache the result in the DRC if any one
1687                  * op in the compound wants to be cached:
1688                  */
1689                 cachethis |= nfsd4_cache_this_op(op);
1690
1691                 if (op->opnum == OP_READ) {
1692                         readcount++;
1693                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1694                 } else
1695                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1696                 /*
1697                  * OP_LOCK may return a conflicting lock.  (Special case
1698                  * because it will just skip encoding this if it runs
1699                  * out of xdr buffer space, and it is the only operation
1700                  * that behaves this way.)
1701                  */
1702                 if (op->opnum == OP_LOCK)
1703                         max_reply += NFS4_OPAQUE_LIMIT;
1704
1705                 if (op->status) {
1706                         argp->opcnt = i+1;
1707                         break;
1708                 }
1709         }
1710         /* Sessions make the DRC unnecessary: */
1711         if (argp->minorversion)
1712                 cachethis = false;
1713         svc_reserve(argp->rqstp, max_reply + readbytes);
1714         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1715
1716         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1717                 argp->rqstp->rq_splice_ok = false;
1718
1719         DECODE_TAIL;
1720 }
1721
1722 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1723 {
1724         if (IS_I_VERSION(inode)) {
1725                 p = xdr_encode_hyper(p, inode->i_version);
1726         } else {
1727                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1728                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1729         }
1730         return p;
1731 }
1732
1733 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1734 {
1735         *p++ = cpu_to_be32(c->atomic);
1736         if (c->change_supported) {
1737                 p = xdr_encode_hyper(p, c->before_change);
1738                 p = xdr_encode_hyper(p, c->after_change);
1739         } else {
1740                 *p++ = cpu_to_be32(c->before_ctime_sec);
1741                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1742                 *p++ = cpu_to_be32(c->after_ctime_sec);
1743                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1744         }
1745         return p;
1746 }
1747
1748 /* Encode as an array of strings the string given with components
1749  * separated @sep, escaped with esc_enter and esc_exit.
1750  */
1751 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1752                                           char *components, char esc_enter,
1753                                           char esc_exit)
1754 {
1755         __be32 *p;
1756         __be32 pathlen;
1757         int pathlen_offset;
1758         int strlen, count=0;
1759         char *str, *end, *next;
1760
1761         dprintk("nfsd4_encode_components(%s)\n", components);
1762
1763         pathlen_offset = xdr->buf->len;
1764         p = xdr_reserve_space(xdr, 4);
1765         if (!p)
1766                 return nfserr_resource;
1767         p++; /* We will fill this in with @count later */
1768
1769         end = str = components;
1770         while (*end) {
1771                 bool found_esc = false;
1772
1773                 /* try to parse as esc_start, ..., esc_end, sep */
1774                 if (*str == esc_enter) {
1775                         for (; *end && (*end != esc_exit); end++)
1776                                 /* find esc_exit or end of string */;
1777                         next = end + 1;
1778                         if (*end && (!*next || *next == sep)) {
1779                                 str++;
1780                                 found_esc = true;
1781                         }
1782                 }
1783
1784                 if (!found_esc)
1785                         for (; *end && (*end != sep); end++)
1786                                 /* find sep or end of string */;
1787
1788                 strlen = end - str;
1789                 if (strlen) {
1790                         p = xdr_reserve_space(xdr, strlen + 4);
1791                         if (!p)
1792                                 return nfserr_resource;
1793                         p = xdr_encode_opaque(p, str, strlen);
1794                         count++;
1795                 }
1796                 else
1797                         end++;
1798                 str = end;
1799         }
1800         pathlen = htonl(xdr->buf->len - pathlen_offset);
1801         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1802         return 0;
1803 }
1804
1805 /* Encode as an array of strings the string given with components
1806  * separated @sep.
1807  */
1808 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1809                                       char *components)
1810 {
1811         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1812 }
1813
1814 /*
1815  * encode a location element of a fs_locations structure
1816  */
1817 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1818                                         struct nfsd4_fs_location *location)
1819 {
1820         __be32 status;
1821
1822         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1823                                                 '[', ']');
1824         if (status)
1825                 return status;
1826         status = nfsd4_encode_components(xdr, '/', location->path);
1827         if (status)
1828                 return status;
1829         return 0;
1830 }
1831
1832 /*
1833  * Encode a path in RFC3530 'pathname4' format
1834  */
1835 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
1836                                 const struct path *root,
1837                                 const struct path *path)
1838 {
1839         struct path cur = *path;
1840         __be32 *p;
1841         struct dentry **components = NULL;
1842         unsigned int ncomponents = 0;
1843         __be32 err = nfserr_jukebox;
1844
1845         dprintk("nfsd4_encode_components(");
1846
1847         path_get(&cur);
1848         /* First walk the path up to the nfsd root, and store the
1849          * dentries/path components in an array.
1850          */
1851         for (;;) {
1852                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1853                         break;
1854                 if (cur.dentry == cur.mnt->mnt_root) {
1855                         if (follow_up(&cur))
1856                                 continue;
1857                         goto out_free;
1858                 }
1859                 if ((ncomponents & 15) == 0) {
1860                         struct dentry **new;
1861                         new = krealloc(components,
1862                                         sizeof(*new) * (ncomponents + 16),
1863                                         GFP_KERNEL);
1864                         if (!new)
1865                                 goto out_free;
1866                         components = new;
1867                 }
1868                 components[ncomponents++] = cur.dentry;
1869                 cur.dentry = dget_parent(cur.dentry);
1870         }
1871         err = nfserr_resource;
1872         p = xdr_reserve_space(xdr, 4);
1873         if (!p)
1874                 goto out_free;
1875         *p++ = cpu_to_be32(ncomponents);
1876
1877         while (ncomponents) {
1878                 struct dentry *dentry = components[ncomponents - 1];
1879                 unsigned int len;
1880
1881                 spin_lock(&dentry->d_lock);
1882                 len = dentry->d_name.len;
1883                 p = xdr_reserve_space(xdr, len + 4);
1884                 if (!p) {
1885                         spin_unlock(&dentry->d_lock);
1886                         goto out_free;
1887                 }
1888                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
1889                 dprintk("/%pd", dentry);
1890                 spin_unlock(&dentry->d_lock);
1891                 dput(dentry);
1892                 ncomponents--;
1893         }
1894
1895         err = 0;
1896 out_free:
1897         dprintk(")\n");
1898         while (ncomponents)
1899                 dput(components[--ncomponents]);
1900         kfree(components);
1901         path_put(&cur);
1902         return err;
1903 }
1904
1905 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
1906                         struct svc_rqst *rqstp, const struct path *path)
1907 {
1908         struct svc_export *exp_ps;
1909         __be32 res;
1910
1911         exp_ps = rqst_find_fsidzero_export(rqstp);
1912         if (IS_ERR(exp_ps))
1913                 return nfserrno(PTR_ERR(exp_ps));
1914         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
1915         exp_put(exp_ps);
1916         return res;
1917 }
1918
1919 /*
1920  *  encode a fs_locations structure
1921  */
1922 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
1923                         struct svc_rqst *rqstp, struct svc_export *exp)
1924 {
1925         __be32 status;
1926         int i;
1927         __be32 *p;
1928         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1929
1930         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1931         if (status)
1932                 return status;
1933         p = xdr_reserve_space(xdr, 4);
1934         if (!p)
1935                 return nfserr_resource;
1936         *p++ = cpu_to_be32(fslocs->locations_count);
1937         for (i=0; i<fslocs->locations_count; i++) {
1938                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1939                 if (status)
1940                         return status;
1941         }
1942         return 0;
1943 }
1944
1945 static u32 nfs4_file_type(umode_t mode)
1946 {
1947         switch (mode & S_IFMT) {
1948         case S_IFIFO:   return NF4FIFO;
1949         case S_IFCHR:   return NF4CHR;
1950         case S_IFDIR:   return NF4DIR;
1951         case S_IFBLK:   return NF4BLK;
1952         case S_IFLNK:   return NF4LNK;
1953         case S_IFREG:   return NF4REG;
1954         case S_IFSOCK:  return NF4SOCK;
1955         default:        return NF4BAD;
1956         };
1957 }
1958
1959 static inline __be32
1960 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1961                      struct nfs4_ace *ace)
1962 {
1963         if (ace->whotype != NFS4_ACL_WHO_NAMED)
1964                 return nfs4_acl_write_who(xdr, ace->whotype);
1965         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1966                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1967         else
1968                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1969 }
1970
1971 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1972                               FATTR4_WORD0_RDATTR_ERROR)
1973 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1974
1975 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1976 static inline __be32
1977 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1978                             void *context, int len)
1979 {
1980         __be32 *p;
1981
1982         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
1983         if (!p)
1984                 return nfserr_resource;
1985
1986         /*
1987          * For now we use a 0 here to indicate the null translation; in
1988          * the future we may place a call to translation code here.
1989          */
1990         *p++ = cpu_to_be32(0); /* lfs */
1991         *p++ = cpu_to_be32(0); /* pi */
1992         p = xdr_encode_opaque(p, context, len);
1993         return 0;
1994 }
1995 #else
1996 static inline __be32
1997 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1998                             void *context, int len)
1999 { return 0; }
2000 #endif
2001
2002 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2003 {
2004         /* As per referral draft:  */
2005         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2006             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2007                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2008                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2009                         *rdattr_err = NFSERR_MOVED;
2010                 else
2011                         return nfserr_moved;
2012         }
2013         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2014         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2015         return 0;
2016 }
2017
2018
2019 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2020 {
2021         struct path path = exp->ex_path;
2022         int err;
2023
2024         path_get(&path);
2025         while (follow_up(&path)) {
2026                 if (path.dentry != path.mnt->mnt_root)
2027                         break;
2028         }
2029         err = vfs_getattr(&path, stat);
2030         path_put(&path);
2031         return err;
2032 }
2033
2034 /*
2035  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2036  * ourselves.
2037  */
2038 static __be32
2039 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2040                 struct svc_export *exp,
2041                 struct dentry *dentry, u32 *bmval,
2042                 struct svc_rqst *rqstp, int ignore_crossmnt)
2043 {
2044         u32 bmval0 = bmval[0];
2045         u32 bmval1 = bmval[1];
2046         u32 bmval2 = bmval[2];
2047         struct kstat stat;
2048         struct svc_fh *tempfh = NULL;
2049         struct kstatfs statfs;
2050         __be32 *p;
2051         int starting_len = xdr->buf->len;
2052         int attrlen_offset;
2053         __be32 attrlen;
2054         u32 dummy;
2055         u64 dummy64;
2056         u32 rdattr_err = 0;
2057         __be32 status;
2058         int err;
2059         int aclsupport = 0;
2060         struct nfs4_acl *acl = NULL;
2061         void *context = NULL;
2062         int contextlen;
2063         bool contextsupport = false;
2064         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2065         u32 minorversion = resp->cstate.minorversion;
2066         struct path path = {
2067                 .mnt    = exp->ex_path.mnt,
2068                 .dentry = dentry,
2069         };
2070         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2071
2072         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2073         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2074         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2075         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2076
2077         if (exp->ex_fslocs.migrated) {
2078                 BUG_ON(bmval[2]);
2079                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2080                 if (status)
2081                         goto out;
2082         }
2083
2084         err = vfs_getattr(&path, &stat);
2085         if (err)
2086                 goto out_nfserr;
2087         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2088                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2089             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2090                        FATTR4_WORD1_SPACE_TOTAL))) {
2091                 err = vfs_statfs(&path, &statfs);
2092                 if (err)
2093                         goto out_nfserr;
2094         }
2095         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2096                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2097                 status = nfserr_jukebox;
2098                 if (!tempfh)
2099                         goto out;
2100                 fh_init(tempfh, NFS4_FHSIZE);
2101                 status = fh_compose(tempfh, exp, dentry, NULL);
2102                 if (status)
2103                         goto out;
2104                 fhp = tempfh;
2105         }
2106         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2107                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2108                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2109                 aclsupport = (err == 0);
2110                 if (bmval0 & FATTR4_WORD0_ACL) {
2111                         if (err == -EOPNOTSUPP)
2112                                 bmval0 &= ~FATTR4_WORD0_ACL;
2113                         else if (err == -EINVAL) {
2114                                 status = nfserr_attrnotsupp;
2115                                 goto out;
2116                         } else if (err != 0)
2117                                 goto out_nfserr;
2118                 }
2119         }
2120
2121 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2122         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2123                         bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2124                 err = security_inode_getsecctx(dentry->d_inode,
2125                                                 &context, &contextlen);
2126                 contextsupport = (err == 0);
2127                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2128                         if (err == -EOPNOTSUPP)
2129                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2130                         else if (err)
2131                                 goto out_nfserr;
2132                 }
2133         }
2134 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2135
2136         if (bmval2) {
2137                 p = xdr_reserve_space(xdr, 16);
2138                 if (!p)
2139                         goto out_resource;
2140                 *p++ = cpu_to_be32(3);
2141                 *p++ = cpu_to_be32(bmval0);
2142                 *p++ = cpu_to_be32(bmval1);
2143                 *p++ = cpu_to_be32(bmval2);
2144         } else if (bmval1) {
2145                 p = xdr_reserve_space(xdr, 12);
2146                 if (!p)
2147                         goto out_resource;
2148                 *p++ = cpu_to_be32(2);
2149                 *p++ = cpu_to_be32(bmval0);
2150                 *p++ = cpu_to_be32(bmval1);
2151         } else {
2152                 p = xdr_reserve_space(xdr, 8);
2153                 if (!p)
2154                         goto out_resource;
2155                 *p++ = cpu_to_be32(1);
2156                 *p++ = cpu_to_be32(bmval0);
2157         }
2158
2159         attrlen_offset = xdr->buf->len;
2160         p = xdr_reserve_space(xdr, 4);
2161         if (!p)
2162                 goto out_resource;
2163         p++;                /* to be backfilled later */
2164
2165         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2166                 u32 word0 = nfsd_suppattrs0(minorversion);
2167                 u32 word1 = nfsd_suppattrs1(minorversion);
2168                 u32 word2 = nfsd_suppattrs2(minorversion);
2169
2170                 if (!aclsupport)
2171                         word0 &= ~FATTR4_WORD0_ACL;
2172                 if (!contextsupport)
2173                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2174                 if (!word2) {
2175                         p = xdr_reserve_space(xdr, 12);
2176                         if (!p)
2177                                 goto out_resource;
2178                         *p++ = cpu_to_be32(2);
2179                         *p++ = cpu_to_be32(word0);
2180                         *p++ = cpu_to_be32(word1);
2181                 } else {
2182                         p = xdr_reserve_space(xdr, 16);
2183                         if (!p)
2184                                 goto out_resource;
2185                         *p++ = cpu_to_be32(3);
2186                         *p++ = cpu_to_be32(word0);
2187                         *p++ = cpu_to_be32(word1);
2188                         *p++ = cpu_to_be32(word2);
2189                 }
2190         }
2191         if (bmval0 & FATTR4_WORD0_TYPE) {
2192                 p = xdr_reserve_space(xdr, 4);
2193                 if (!p)
2194                         goto out_resource;
2195                 dummy = nfs4_file_type(stat.mode);
2196                 if (dummy == NF4BAD) {
2197                         status = nfserr_serverfault;
2198                         goto out;
2199                 }
2200                 *p++ = cpu_to_be32(dummy);
2201         }
2202         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2203                 p = xdr_reserve_space(xdr, 4);
2204                 if (!p)
2205                         goto out_resource;
2206                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2207                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2208                 else
2209                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2210                                                 NFS4_FH_VOL_RENAME);
2211         }
2212         if (bmval0 & FATTR4_WORD0_CHANGE) {
2213                 p = xdr_reserve_space(xdr, 8);
2214                 if (!p)
2215                         goto out_resource;
2216                 p = encode_change(p, &stat, dentry->d_inode);
2217         }
2218         if (bmval0 & FATTR4_WORD0_SIZE) {
2219                 p = xdr_reserve_space(xdr, 8);
2220                 if (!p)
2221                         goto out_resource;
2222                 p = xdr_encode_hyper(p, stat.size);
2223         }
2224         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2225                 p = xdr_reserve_space(xdr, 4);
2226                 if (!p)
2227                         goto out_resource;
2228                 *p++ = cpu_to_be32(1);
2229         }
2230         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2231                 p = xdr_reserve_space(xdr, 4);
2232                 if (!p)
2233                         goto out_resource;
2234                 *p++ = cpu_to_be32(1);
2235         }
2236         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2237                 p = xdr_reserve_space(xdr, 4);
2238                 if (!p)
2239                         goto out_resource;
2240                 *p++ = cpu_to_be32(0);
2241         }
2242         if (bmval0 & FATTR4_WORD0_FSID) {
2243                 p = xdr_reserve_space(xdr, 16);
2244                 if (!p)
2245                         goto out_resource;
2246                 if (exp->ex_fslocs.migrated) {
2247                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2248                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2249                 } else switch(fsid_source(fhp)) {
2250                 case FSIDSOURCE_FSID:
2251                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2252                         p = xdr_encode_hyper(p, (u64)0);
2253                         break;
2254                 case FSIDSOURCE_DEV:
2255                         *p++ = cpu_to_be32(0);
2256                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2257                         *p++ = cpu_to_be32(0);
2258                         *p++ = cpu_to_be32(MINOR(stat.dev));
2259                         break;
2260                 case FSIDSOURCE_UUID:
2261                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2262                                                                 EX_UUID_LEN);
2263                         break;
2264                 }
2265         }
2266         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2267                 p = xdr_reserve_space(xdr, 4);
2268                 if (!p)
2269                         goto out_resource;
2270                 *p++ = cpu_to_be32(0);
2271         }
2272         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2273                 p = xdr_reserve_space(xdr, 4);
2274                 if (!p)
2275                         goto out_resource;
2276                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2277         }
2278         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2279                 p = xdr_reserve_space(xdr, 4);
2280                 if (!p)
2281                         goto out_resource;
2282                 *p++ = cpu_to_be32(rdattr_err);
2283         }
2284         if (bmval0 & FATTR4_WORD0_ACL) {
2285                 struct nfs4_ace *ace;
2286
2287                 if (acl == NULL) {
2288                         p = xdr_reserve_space(xdr, 4);
2289                         if (!p)
2290                                 goto out_resource;
2291
2292                         *p++ = cpu_to_be32(0);
2293                         goto out_acl;
2294                 }
2295                 p = xdr_reserve_space(xdr, 4);
2296                 if (!p)
2297                         goto out_resource;
2298                 *p++ = cpu_to_be32(acl->naces);
2299
2300                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2301                         p = xdr_reserve_space(xdr, 4*3);
2302                         if (!p)
2303                                 goto out_resource;
2304                         *p++ = cpu_to_be32(ace->type);
2305                         *p++ = cpu_to_be32(ace->flag);
2306                         *p++ = cpu_to_be32(ace->access_mask &
2307                                                         NFS4_ACE_MASK_ALL);
2308                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2309                         if (status)
2310                                 goto out;
2311                 }
2312         }
2313 out_acl:
2314         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2315                 p = xdr_reserve_space(xdr, 4);
2316                 if (!p)
2317                         goto out_resource;
2318                 *p++ = cpu_to_be32(aclsupport ?
2319                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2320         }
2321         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2322                 p = xdr_reserve_space(xdr, 4);
2323                 if (!p)
2324                         goto out_resource;
2325                 *p++ = cpu_to_be32(1);
2326         }
2327         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2328                 p = xdr_reserve_space(xdr, 4);
2329                 if (!p)
2330                         goto out_resource;
2331                 *p++ = cpu_to_be32(0);
2332         }
2333         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2334                 p = xdr_reserve_space(xdr, 4);
2335                 if (!p)
2336                         goto out_resource;
2337                 *p++ = cpu_to_be32(1);
2338         }
2339         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2340                 p = xdr_reserve_space(xdr, 4);
2341                 if (!p)
2342                         goto out_resource;
2343                 *p++ = cpu_to_be32(1);
2344         }
2345         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2346                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2347                 if (!p)
2348                         goto out_resource;
2349                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2350                                         fhp->fh_handle.fh_size);
2351         }
2352         if (bmval0 & FATTR4_WORD0_FILEID) {
2353                 p = xdr_reserve_space(xdr, 8);
2354                 if (!p)
2355                         goto out_resource;
2356                 p = xdr_encode_hyper(p, stat.ino);
2357         }
2358         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2359                 p = xdr_reserve_space(xdr, 8);
2360                 if (!p)
2361                         goto out_resource;
2362                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2363         }
2364         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2365                 p = xdr_reserve_space(xdr, 8);
2366                 if (!p)
2367                         goto out_resource;
2368                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2369         }
2370         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2371                 p = xdr_reserve_space(xdr, 8);
2372                 if (!p)
2373                         goto out_resource;
2374                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2375         }
2376         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2377                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2378                 if (status)
2379                         goto out;
2380         }
2381         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2382                 p = xdr_reserve_space(xdr, 4);
2383                 if (!p)
2384                         goto out_resource;
2385                 *p++ = cpu_to_be32(1);
2386         }
2387         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2388                 p = xdr_reserve_space(xdr, 8);
2389                 if (!p)
2390                         goto out_resource;
2391                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2392         }
2393         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2394                 p = xdr_reserve_space(xdr, 4);
2395                 if (!p)
2396                         goto out_resource;
2397                 *p++ = cpu_to_be32(255);
2398         }
2399         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2400                 p = xdr_reserve_space(xdr, 4);
2401                 if (!p)
2402                         goto out_resource;
2403                 *p++ = cpu_to_be32(statfs.f_namelen);
2404         }
2405         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2406                 p = xdr_reserve_space(xdr, 8);
2407                 if (!p)
2408                         goto out_resource;
2409                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2410         }
2411         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2412                 p = xdr_reserve_space(xdr, 8);
2413                 if (!p)
2414                         goto out_resource;
2415                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2416         }
2417         if (bmval1 & FATTR4_WORD1_MODE) {
2418                 p = xdr_reserve_space(xdr, 4);
2419                 if (!p)
2420                         goto out_resource;
2421                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2422         }
2423         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2424                 p = xdr_reserve_space(xdr, 4);
2425                 if (!p)
2426                         goto out_resource;
2427                 *p++ = cpu_to_be32(1);
2428         }
2429         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2430                 p = xdr_reserve_space(xdr, 4);
2431                 if (!p)
2432                         goto out_resource;
2433                 *p++ = cpu_to_be32(stat.nlink);
2434         }
2435         if (bmval1 & FATTR4_WORD1_OWNER) {
2436                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2437                 if (status)
2438                         goto out;
2439         }
2440         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2441                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2442                 if (status)
2443                         goto out;
2444         }
2445         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2446                 p = xdr_reserve_space(xdr, 8);
2447                 if (!p)
2448                         goto out_resource;
2449                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2450                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2451         }
2452         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2453                 p = xdr_reserve_space(xdr, 8);
2454                 if (!p)
2455                         goto out_resource;
2456                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2457                 p = xdr_encode_hyper(p, dummy64);
2458         }
2459         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2460                 p = xdr_reserve_space(xdr, 8);
2461                 if (!p)
2462                         goto out_resource;
2463                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2464                 p = xdr_encode_hyper(p, dummy64);
2465         }
2466         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2467                 p = xdr_reserve_space(xdr, 8);
2468                 if (!p)
2469                         goto out_resource;
2470                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2471                 p = xdr_encode_hyper(p, dummy64);
2472         }
2473         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2474                 p = xdr_reserve_space(xdr, 8);
2475                 if (!p)
2476                         goto out_resource;
2477                 dummy64 = (u64)stat.blocks << 9;
2478                 p = xdr_encode_hyper(p, dummy64);
2479         }
2480         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2481                 p = xdr_reserve_space(xdr, 12);
2482                 if (!p)
2483                         goto out_resource;
2484                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2485                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2486         }
2487         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2488                 p = xdr_reserve_space(xdr, 12);
2489                 if (!p)
2490                         goto out_resource;
2491                 *p++ = cpu_to_be32(0);
2492                 *p++ = cpu_to_be32(1);
2493                 *p++ = cpu_to_be32(0);
2494         }
2495         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2496                 p = xdr_reserve_space(xdr, 12);
2497                 if (!p)
2498                         goto out_resource;
2499                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2500                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2501         }
2502         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2503                 p = xdr_reserve_space(xdr, 12);
2504                 if (!p)
2505                         goto out_resource;
2506                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2507                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2508         }
2509         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2510                 p = xdr_reserve_space(xdr, 8);
2511                 if (!p)
2512                         goto out_resource;
2513                 /*
2514                  * Get parent's attributes if not ignoring crossmount
2515                  * and this is the root of a cross-mounted filesystem.
2516                  */
2517                 if (ignore_crossmnt == 0 &&
2518                     dentry == exp->ex_path.mnt->mnt_root)
2519                         get_parent_attributes(exp, &stat);
2520                 p = xdr_encode_hyper(p, stat.ino);
2521         }
2522         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2523                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2524                                                                 contextlen);
2525                 if (status)
2526                         goto out;
2527         }
2528         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2529                 p = xdr_reserve_space(xdr, 16);
2530                 if (!p)
2531                         goto out_resource;
2532                 *p++ = cpu_to_be32(3);
2533                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2534                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2535                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2536         }
2537
2538         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2539         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2540         status = nfs_ok;
2541
2542 out:
2543 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2544         if (context)
2545                 security_release_secctx(context, contextlen);
2546 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2547         kfree(acl);
2548         if (tempfh) {
2549                 fh_put(tempfh);
2550                 kfree(tempfh);
2551         }
2552         if (status)
2553                 xdr_truncate_encode(xdr, starting_len);
2554         return status;
2555 out_nfserr:
2556         status = nfserrno(err);
2557         goto out;
2558 out_resource:
2559         status = nfserr_resource;
2560         goto out;
2561 }
2562
2563 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2564                                 struct xdr_buf *buf, __be32 *p, int bytes)
2565 {
2566         xdr->scratch.iov_len = 0;
2567         memset(buf, 0, sizeof(struct xdr_buf));
2568         buf->head[0].iov_base = p;
2569         buf->head[0].iov_len = 0;
2570         buf->len = 0;
2571         xdr->buf = buf;
2572         xdr->iov = buf->head;
2573         xdr->p = p;
2574         xdr->end = (void *)p + bytes;
2575         buf->buflen = bytes;
2576 }
2577
2578 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2579                         struct svc_fh *fhp, struct svc_export *exp,
2580                         struct dentry *dentry, u32 *bmval,
2581                         struct svc_rqst *rqstp, int ignore_crossmnt)
2582 {
2583         struct xdr_buf dummy;
2584         struct xdr_stream xdr;
2585         __be32 ret;
2586
2587         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2588         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2589                                                         ignore_crossmnt);
2590         *p = xdr.p;
2591         return ret;
2592 }
2593
2594 static inline int attributes_need_mount(u32 *bmval)
2595 {
2596         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2597                 return 1;
2598         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2599                 return 1;
2600         return 0;
2601 }
2602
2603 static __be32
2604 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2605                         const char *name, int namlen)
2606 {
2607         struct svc_export *exp = cd->rd_fhp->fh_export;
2608         struct dentry *dentry;
2609         __be32 nfserr;
2610         int ignore_crossmnt = 0;
2611
2612         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2613         if (IS_ERR(dentry))
2614                 return nfserrno(PTR_ERR(dentry));
2615         if (!dentry->d_inode) {
2616                 /*
2617                  * nfsd_buffered_readdir drops the i_mutex between
2618                  * readdir and calling this callback, leaving a window
2619                  * where this directory entry could have gone away.
2620                  */
2621                 dput(dentry);
2622                 return nfserr_noent;
2623         }
2624
2625         exp_get(exp);
2626         /*
2627          * In the case of a mountpoint, the client may be asking for
2628          * attributes that are only properties of the underlying filesystem
2629          * as opposed to the cross-mounted file system. In such a case,
2630          * we will not follow the cross mount and will fill the attribtutes
2631          * directly from the mountpoint dentry.
2632          */
2633         if (nfsd_mountpoint(dentry, exp)) {
2634                 int err;
2635
2636                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2637                                 && !attributes_need_mount(cd->rd_bmval)) {
2638                         ignore_crossmnt = 1;
2639                         goto out_encode;
2640                 }
2641                 /*
2642                  * Why the heck aren't we just using nfsd_lookup??
2643                  * Different "."/".." handling?  Something else?
2644                  * At least, add a comment here to explain....
2645                  */
2646                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2647                 if (err) {
2648                         nfserr = nfserrno(err);
2649                         goto out_put;
2650                 }
2651                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2652                 if (nfserr)
2653                         goto out_put;
2654
2655         }
2656 out_encode:
2657         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2658                                         cd->rd_rqstp, ignore_crossmnt);
2659 out_put:
2660         dput(dentry);
2661         exp_put(exp);
2662         return nfserr;
2663 }
2664
2665 static __be32 *
2666 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2667 {
2668         __be32 *p;
2669
2670         p = xdr_reserve_space(xdr, 20);
2671         if (!p)
2672                 return NULL;
2673         *p++ = htonl(2);
2674         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2675         *p++ = htonl(0);                         /* bmval1 */
2676
2677         *p++ = htonl(4);     /* attribute length */
2678         *p++ = nfserr;       /* no htonl */
2679         return p;
2680 }
2681
2682 static int
2683 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2684                     loff_t offset, u64 ino, unsigned int d_type)
2685 {
2686         struct readdir_cd *ccd = ccdv;
2687         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2688         struct xdr_stream *xdr = cd->xdr;
2689         int start_offset = xdr->buf->len;
2690         int cookie_offset;
2691         u32 name_and_cookie;
2692         int entry_bytes;
2693         __be32 nfserr = nfserr_toosmall;
2694         __be64 wire_offset;
2695         __be32 *p;
2696
2697         /* In nfsv4, "." and ".." never make it onto the wire.. */
2698         if (name && isdotent(name, namlen)) {
2699                 cd->common.err = nfs_ok;
2700                 return 0;
2701         }
2702
2703         if (cd->cookie_offset) {
2704                 wire_offset = cpu_to_be64(offset);
2705                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2706                                                         &wire_offset, 8);
2707         }
2708
2709         p = xdr_reserve_space(xdr, 4);
2710         if (!p)
2711                 goto fail;
2712         *p++ = xdr_one;                             /* mark entry present */
2713         cookie_offset = xdr->buf->len;
2714         p = xdr_reserve_space(xdr, 3*4 + namlen);
2715         if (!p)
2716                 goto fail;
2717         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2718         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2719
2720         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2721         switch (nfserr) {
2722         case nfs_ok:
2723                 break;
2724         case nfserr_resource:
2725                 nfserr = nfserr_toosmall;
2726                 goto fail;
2727         case nfserr_noent:
2728                 xdr_truncate_encode(xdr, start_offset);
2729                 goto skip_entry;
2730         default:
2731                 /*
2732                  * If the client requested the RDATTR_ERROR attribute,
2733                  * we stuff the error code into this attribute
2734                  * and continue.  If this attribute was not requested,
2735                  * then in accordance with the spec, we fail the
2736                  * entire READDIR operation(!)
2737                  */
2738                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2739                         goto fail;
2740                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2741                 if (p == NULL) {
2742                         nfserr = nfserr_toosmall;
2743                         goto fail;
2744                 }
2745         }
2746         nfserr = nfserr_toosmall;
2747         entry_bytes = xdr->buf->len - start_offset;
2748         if (entry_bytes > cd->rd_maxcount)
2749                 goto fail;
2750         cd->rd_maxcount -= entry_bytes;
2751         if (!cd->rd_dircount)
2752                 goto fail;
2753         /*
2754          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
2755          * let's always let through the first entry, at least:
2756          */
2757         name_and_cookie = 4 * XDR_QUADLEN(namlen) + 8;
2758         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
2759                 goto fail;
2760         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
2761         cd->cookie_offset = cookie_offset;
2762 skip_entry:
2763         cd->common.err = nfs_ok;
2764         return 0;
2765 fail:
2766         xdr_truncate_encode(xdr, start_offset);
2767         cd->common.err = nfserr;
2768         return -EINVAL;
2769 }
2770
2771 static __be32
2772 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2773 {
2774         __be32 *p;
2775
2776         p = xdr_reserve_space(xdr, sizeof(stateid_t));
2777         if (!p)
2778                 return nfserr_resource;
2779         *p++ = cpu_to_be32(sid->si_generation);
2780         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
2781                                         sizeof(stateid_opaque_t));
2782         return 0;
2783 }
2784
2785 static __be32
2786 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2787 {
2788         struct xdr_stream *xdr = &resp->xdr;
2789         __be32 *p;
2790
2791         if (!nfserr) {
2792                 p = xdr_reserve_space(xdr, 8);
2793                 if (!p)
2794                         return nfserr_resource;
2795                 *p++ = cpu_to_be32(access->ac_supported);
2796                 *p++ = cpu_to_be32(access->ac_resp_access);
2797         }
2798         return nfserr;
2799 }
2800
2801 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2802 {
2803         struct xdr_stream *xdr = &resp->xdr;
2804         __be32 *p;
2805
2806         if (!nfserr) {
2807                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
2808                 if (!p)
2809                         return nfserr_resource;
2810                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
2811                                                 NFS4_MAX_SESSIONID_LEN);
2812                 *p++ = cpu_to_be32(bcts->dir);
2813                 /* Sorry, we do not yet support RDMA over 4.1: */
2814                 *p++ = cpu_to_be32(0);
2815         }
2816         return nfserr;
2817 }
2818
2819 static __be32
2820 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2821 {
2822         struct xdr_stream *xdr = &resp->xdr;
2823
2824         if (!nfserr)
2825                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2826
2827         return nfserr;
2828 }
2829
2830
2831 static __be32
2832 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2833 {
2834         struct xdr_stream *xdr = &resp->xdr;
2835         __be32 *p;
2836
2837         if (!nfserr) {
2838                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
2839                 if (!p)
2840                         return nfserr_resource;
2841                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
2842                                                 NFS4_VERIFIER_SIZE);
2843         }
2844         return nfserr;
2845 }
2846
2847 static __be32
2848 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2849 {
2850         struct xdr_stream *xdr = &resp->xdr;
2851         __be32 *p;
2852
2853         if (!nfserr) {
2854                 p = xdr_reserve_space(xdr, 32);
2855                 if (!p)
2856                         return nfserr_resource;
2857                 p = encode_cinfo(p, &create->cr_cinfo);
2858                 *p++ = cpu_to_be32(2);
2859                 *p++ = cpu_to_be32(create->cr_bmval[0]);
2860                 *p++ = cpu_to_be32(create->cr_bmval[1]);
2861         }
2862         return nfserr;
2863 }
2864
2865 static __be32
2866 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2867 {
2868         struct svc_fh *fhp = getattr->ga_fhp;
2869         struct xdr_stream *xdr = &resp->xdr;
2870
2871         if (nfserr)
2872                 return nfserr;
2873
2874         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
2875                                     getattr->ga_bmval,
2876                                     resp->rqstp, 0);
2877         return nfserr;
2878 }
2879
2880 static __be32
2881 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2882 {
2883         struct xdr_stream *xdr = &resp->xdr;
2884         struct svc_fh *fhp = *fhpp;
2885         unsigned int len;
2886         __be32 *p;
2887
2888         if (!nfserr) {
2889                 len = fhp->fh_handle.fh_size;
2890                 p = xdr_reserve_space(xdr, len + 4);
2891                 if (!p)
2892                         return nfserr_resource;
2893                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
2894         }
2895         return nfserr;
2896 }
2897
2898 /*
2899 * Including all fields other than the name, a LOCK4denied structure requires
2900 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2901 */
2902 static __be32
2903 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
2904 {
2905         struct xdr_netobj *conf = &ld->ld_owner;
2906         __be32 *p;
2907
2908 again:
2909         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2910         if (!p) {
2911                 /*
2912                  * Don't fail to return the result just because we can't
2913                  * return the conflicting open:
2914                  */
2915                 if (conf->len) {
2916                         kfree(conf->data);
2917                         conf->len = 0;
2918                         conf->data = NULL;
2919                         goto again;
2920                 }
2921                 return nfserr_resource;
2922         }
2923         p = xdr_encode_hyper(p, ld->ld_start);
2924         p = xdr_encode_hyper(p, ld->ld_length);
2925         *p++ = cpu_to_be32(ld->ld_type);
2926         if (conf->len) {
2927                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
2928                 p = xdr_encode_opaque(p, conf->data, conf->len);
2929                 kfree(conf->data);
2930         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2931                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
2932                 *p++ = cpu_to_be32(0); /* length of owner name */
2933         }
2934         return nfserr_denied;
2935 }
2936
2937 static __be32
2938 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2939 {
2940         struct xdr_stream *xdr = &resp->xdr;
2941
2942         if (!nfserr)
2943                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2944         else if (nfserr == nfserr_denied)
2945                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2946
2947         return nfserr;
2948 }
2949
2950 static __be32
2951 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2952 {
2953         struct xdr_stream *xdr = &resp->xdr;
2954
2955         if (nfserr == nfserr_denied)
2956                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2957         return nfserr;
2958 }
2959
2960 static __be32
2961 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2962 {
2963         struct xdr_stream *xdr = &resp->xdr;
2964
2965         if (!nfserr)
2966                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2967
2968         return nfserr;
2969 }
2970
2971
2972 static __be32
2973 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2974 {
2975         struct xdr_stream *xdr = &resp->xdr;
2976         __be32 *p;
2977
2978         if (!nfserr) {
2979                 p = xdr_reserve_space(xdr, 20);
2980                 if (!p)
2981                         return nfserr_resource;
2982                 p = encode_cinfo(p, &link->li_cinfo);
2983         }
2984         return nfserr;
2985 }
2986
2987
2988 static __be32
2989 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2990 {
2991         struct xdr_stream *xdr = &resp->xdr;
2992         __be32 *p;
2993
2994         if (nfserr)
2995                 goto out;
2996
2997         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
2998         if (nfserr)
2999                 goto out;
3000         p = xdr_reserve_space(xdr, 40);
3001         if (!p)
3002                 return nfserr_resource;
3003         p = encode_cinfo(p, &open->op_cinfo);
3004         *p++ = cpu_to_be32(open->op_rflags);
3005         *p++ = cpu_to_be32(2);
3006         *p++ = cpu_to_be32(open->op_bmval[0]);
3007         *p++ = cpu_to_be32(open->op_bmval[1]);
3008         *p++ = cpu_to_be32(open->op_delegate_type);
3009
3010         switch (open->op_delegate_type) {
3011         case NFS4_OPEN_DELEGATE_NONE:
3012                 break;
3013         case NFS4_OPEN_DELEGATE_READ:
3014                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3015                 if (nfserr)
3016                         return nfserr;
3017                 p = xdr_reserve_space(xdr, 20);
3018                 if (!p)
3019                         return nfserr_resource;
3020                 *p++ = cpu_to_be32(open->op_recall);
3021
3022                 /*
3023                  * TODO: ACE's in delegations
3024                  */
3025                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3026                 *p++ = cpu_to_be32(0);
3027                 *p++ = cpu_to_be32(0);
3028                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3029                 break;
3030         case NFS4_OPEN_DELEGATE_WRITE:
3031                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3032                 if (nfserr)
3033                         return nfserr;
3034                 p = xdr_reserve_space(xdr, 32);
3035                 if (!p)
3036                         return nfserr_resource;
3037                 *p++ = cpu_to_be32(0);
3038
3039                 /*
3040                  * TODO: space_limit's in delegations
3041                  */
3042                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3043                 *p++ = cpu_to_be32(~(u32)0);
3044                 *p++ = cpu_to_be32(~(u32)0);
3045
3046                 /*
3047                  * TODO: ACE's in delegations
3048                  */
3049                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3050                 *p++ = cpu_to_be32(0);
3051                 *p++ = cpu_to_be32(0);
3052                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3053                 break;
3054         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3055                 switch (open->op_why_no_deleg) {
3056                 case WND4_CONTENTION:
3057                 case WND4_RESOURCE:
3058                         p = xdr_reserve_space(xdr, 8);
3059                         if (!p)
3060                                 return nfserr_resource;
3061                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3062                         /* deleg signaling not supported yet: */
3063                         *p++ = cpu_to_be32(0);
3064                         break;
3065                 default:
3066                         p = xdr_reserve_space(xdr, 4);
3067                         if (!p)
3068                                 return nfserr_resource;
3069                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3070                 }
3071                 break;
3072         default:
3073                 BUG();
3074         }
3075         /* XXX save filehandle here */
3076 out:
3077         return nfserr;
3078 }
3079
3080 static __be32
3081 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3082 {
3083         struct xdr_stream *xdr = &resp->xdr;
3084
3085         if (!nfserr)
3086                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3087
3088         return nfserr;
3089 }
3090
3091 static __be32
3092 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3093 {
3094         struct xdr_stream *xdr = &resp->xdr;
3095
3096         if (!nfserr)
3097                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3098
3099         return nfserr;
3100 }
3101
3102 static __be32 nfsd4_encode_splice_read(
3103                                 struct nfsd4_compoundres *resp,
3104                                 struct nfsd4_read *read,
3105                                 struct file *file, unsigned long maxcount)
3106 {
3107         struct xdr_stream *xdr = &resp->xdr;
3108         struct xdr_buf *buf = xdr->buf;
3109         u32 eof;
3110         int space_left;
3111         __be32 nfserr;
3112         __be32 *p = xdr->p - 2;
3113
3114         /* Make sure there will be room for padding if needed */
3115         if (xdr->end - xdr->p < 1)
3116                 return nfserr_resource;
3117
3118         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3119                                   read->rd_offset, &maxcount);
3120         if (nfserr) {
3121                 /*
3122                  * nfsd_splice_actor may have already messed with the
3123                  * page length; reset it so as not to confuse
3124                  * xdr_truncate_encode:
3125                  */
3126                 buf->page_len = 0;
3127                 return nfserr;
3128         }
3129
3130         eof = (read->rd_offset + maxcount >=
3131                read->rd_fhp->fh_dentry->d_inode->i_size);
3132
3133         *(p++) = htonl(eof);
3134         *(p++) = htonl(maxcount);
3135
3136         buf->page_len = maxcount;
3137         buf->len += maxcount;
3138         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3139                                                         / PAGE_SIZE;
3140
3141         /* Use rest of head for padding and remaining ops: */
3142         buf->tail[0].iov_base = xdr->p;
3143         buf->tail[0].iov_len = 0;
3144         xdr->iov = buf->tail;
3145         if (maxcount&3) {
3146                 int pad = 4 - (maxcount&3);
3147
3148                 *(xdr->p++) = 0;
3149
3150                 buf->tail[0].iov_base += maxcount&3;
3151                 buf->tail[0].iov_len = pad;
3152                 buf->len += pad;
3153         }
3154
3155         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3156                                 buf->buflen - buf->len);
3157         buf->buflen = buf->len + space_left;
3158         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3159
3160         return 0;
3161 }
3162
3163 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3164                                  struct nfsd4_read *read,
3165                                  struct file *file, unsigned long maxcount)
3166 {
3167         struct xdr_stream *xdr = &resp->xdr;
3168         u32 eof;
3169         int v;
3170         int starting_len = xdr->buf->len - 8;
3171         long len;
3172         int thislen;
3173         __be32 nfserr;
3174         __be32 tmp;
3175         __be32 *p;
3176         u32 zzz = 0;
3177         int pad;
3178
3179         len = maxcount;
3180         v = 0;
3181
3182         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3183         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3184         WARN_ON_ONCE(!p);
3185         resp->rqstp->rq_vec[v].iov_base = p;
3186         resp->rqstp->rq_vec[v].iov_len = thislen;
3187         v++;
3188         len -= thislen;
3189
3190         while (len) {
3191                 thislen = min_t(long, len, PAGE_SIZE);
3192                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3193                 WARN_ON_ONCE(!p);
3194                 resp->rqstp->rq_vec[v].iov_base = p;
3195                 resp->rqstp->rq_vec[v].iov_len = thislen;
3196                 v++;
3197                 len -= thislen;
3198         }
3199         read->rd_vlen = v;
3200
3201         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3202                         read->rd_vlen, &maxcount);
3203         if (nfserr)
3204                 return nfserr;
3205         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3206
3207         eof = (read->rd_offset + maxcount >=
3208                read->rd_fhp->fh_dentry->d_inode->i_size);
3209
3210         tmp = htonl(eof);
3211         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3212         tmp = htonl(maxcount);
3213         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3214
3215         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3216         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3217                                                                 &zzz, pad);
3218         return 0;
3219
3220 }
3221
3222 static __be32
3223 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3224                   struct nfsd4_read *read)
3225 {
3226         unsigned long maxcount;
3227         struct xdr_stream *xdr = &resp->xdr;
3228         struct file *file = read->rd_filp;
3229         int starting_len = xdr->buf->len;
3230         struct raparms *ra;
3231         __be32 *p;
3232         __be32 err;
3233
3234         if (nfserr)
3235                 return nfserr;
3236
3237         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3238         if (!p) {
3239                 WARN_ON_ONCE(resp->rqstp->rq_splice_ok);
3240                 return nfserr_resource;
3241         }
3242         if (resp->xdr.buf->page_len && resp->rqstp->rq_splice_ok) {
3243                 WARN_ON_ONCE(1);
3244                 return nfserr_resource;
3245         }
3246         xdr_commit_encode(xdr);
3247
3248         maxcount = svc_max_payload(resp->rqstp);
3249         maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len));
3250         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3251
3252         if (!read->rd_filp) {
3253                 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
3254                                                 &file, &ra);
3255                 if (err)
3256                         goto err_truncate;
3257         }
3258
3259         if (file->f_op->splice_read && resp->rqstp->rq_splice_ok)
3260                 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
3261         else
3262                 err = nfsd4_encode_readv(resp, read, file, maxcount);
3263
3264         if (!read->rd_filp)
3265                 nfsd_put_tmp_read_open(file, ra);
3266
3267 err_truncate:
3268         if (err)
3269                 xdr_truncate_encode(xdr, starting_len);
3270         return err;
3271 }
3272
3273 static __be32
3274 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3275 {
3276         int maxcount;
3277         __be32 wire_count;
3278         int zero = 0;
3279         struct xdr_stream *xdr = &resp->xdr;
3280         int length_offset = xdr->buf->len;
3281         __be32 *p;
3282
3283         if (nfserr)
3284                 return nfserr;
3285
3286         p = xdr_reserve_space(xdr, 4);
3287         if (!p)
3288                 return nfserr_resource;
3289         maxcount = PAGE_SIZE;
3290
3291         p = xdr_reserve_space(xdr, maxcount);
3292         if (!p)
3293                 return nfserr_resource;
3294         /*
3295          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3296          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3297          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3298          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3299          */
3300         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3301                                                 (char *)p, &maxcount);
3302         if (nfserr == nfserr_isdir)
3303                 nfserr = nfserr_inval;
3304         if (nfserr) {
3305                 xdr_truncate_encode(xdr, length_offset);
3306                 return nfserr;
3307         }
3308
3309         wire_count = htonl(maxcount);
3310         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3311         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3312         if (maxcount & 3)
3313                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3314                                                 &zero, 4 - (maxcount&3));
3315         return 0;
3316 }
3317
3318 static __be32
3319 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3320 {
3321         int maxcount;
3322         int bytes_left;
3323         loff_t offset;
3324         __be64 wire_offset;
3325         struct xdr_stream *xdr = &resp->xdr;
3326         int starting_len = xdr->buf->len;
3327         __be32 *p;
3328
3329         if (nfserr)
3330                 return nfserr;
3331
3332         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3333         if (!p)
3334                 return nfserr_resource;
3335
3336         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3337         *p++ = cpu_to_be32(0);
3338         *p++ = cpu_to_be32(0);
3339         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3340                                 - (char *)resp->xdr.buf->head[0].iov_base;
3341
3342         /*
3343          * Number of bytes left for directory entries allowing for the
3344          * final 8 bytes of the readdir and a following failed op:
3345          */
3346         bytes_left = xdr->buf->buflen - xdr->buf->len
3347                         - COMPOUND_ERR_SLACK_SPACE - 8;
3348         if (bytes_left < 0) {
3349                 nfserr = nfserr_resource;
3350                 goto err_no_verf;
3351         }
3352         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3353         /*
3354          * Note the rfc defines rd_maxcount as the size of the
3355          * READDIR4resok structure, which includes the verifier above
3356          * and the 8 bytes encoded at the end of this function:
3357          */
3358         if (maxcount < 16) {
3359                 nfserr = nfserr_toosmall;
3360                 goto err_no_verf;
3361         }
3362         maxcount = min_t(int, maxcount-16, bytes_left);
3363
3364         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3365         if (!readdir->rd_dircount)
3366                 readdir->rd_dircount = INT_MAX;
3367
3368         readdir->xdr = xdr;
3369         readdir->rd_maxcount = maxcount;
3370         readdir->common.err = 0;
3371         readdir->cookie_offset = 0;
3372
3373         offset = readdir->rd_cookie;
3374         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3375                               &offset,
3376                               &readdir->common, nfsd4_encode_dirent);
3377         if (nfserr == nfs_ok &&
3378             readdir->common.err == nfserr_toosmall &&
3379             xdr->buf->len == starting_len + 8) {
3380                 /* nothing encoded; which limit did we hit?: */
3381                 if (maxcount - 16 < bytes_left)
3382                         /* It was the fault of rd_maxcount: */
3383                         nfserr = nfserr_toosmall;
3384                 else
3385                         /* We ran out of buffer space: */
3386                         nfserr = nfserr_resource;
3387         }
3388         if (nfserr)
3389                 goto err_no_verf;
3390
3391         if (readdir->cookie_offset) {
3392                 wire_offset = cpu_to_be64(offset);
3393                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3394                                                         &wire_offset, 8);
3395         }
3396
3397         p = xdr_reserve_space(xdr, 8);
3398         if (!p) {
3399                 WARN_ON_ONCE(1);
3400                 goto err_no_verf;
3401         }
3402         *p++ = 0;       /* no more entries */
3403         *p++ = htonl(readdir->common.err == nfserr_eof);
3404
3405         return 0;
3406 err_no_verf:
3407         xdr_truncate_encode(xdr, starting_len);
3408         return nfserr;
3409 }
3410
3411 static __be32
3412 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3413 {
3414         struct xdr_stream *xdr = &resp->xdr;
3415         __be32 *p;
3416
3417         if (!nfserr) {
3418                 p = xdr_reserve_space(xdr, 20);
3419                 if (!p)
3420                         return nfserr_resource;
3421                 p = encode_cinfo(p, &remove->rm_cinfo);
3422         }
3423         return nfserr;
3424 }
3425
3426 static __be32
3427 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3428 {
3429         struct xdr_stream *xdr = &resp->xdr;
3430         __be32 *p;
3431
3432         if (!nfserr) {
3433                 p = xdr_reserve_space(xdr, 40);
3434                 if (!p)
3435                         return nfserr_resource;
3436                 p = encode_cinfo(p, &rename->rn_sinfo);
3437                 p = encode_cinfo(p, &rename->rn_tinfo);
3438         }
3439         return nfserr;
3440 }
3441
3442 static __be32
3443 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3444                          __be32 nfserr, struct svc_export *exp)
3445 {
3446         u32 i, nflavs, supported;
3447         struct exp_flavor_info *flavs;
3448         struct exp_flavor_info def_flavs[2];
3449         __be32 *p, *flavorsp;
3450         static bool report = true;
3451
3452         if (nfserr)
3453                 goto out;
3454         nfserr = nfserr_resource;
3455         if (exp->ex_nflavors) {
3456                 flavs = exp->ex_flavors;
3457                 nflavs = exp->ex_nflavors;
3458         } else { /* Handling of some defaults in absence of real secinfo: */
3459                 flavs = def_flavs;
3460                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3461                         nflavs = 2;
3462                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3463                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3464                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3465                         nflavs = 1;
3466                         flavs[0].pseudoflavor
3467                                         = svcauth_gss_flavor(exp->ex_client);
3468                 } else {
3469                         nflavs = 1;
3470                         flavs[0].pseudoflavor
3471                                         = exp->ex_client->flavour->flavour;
3472                 }
3473         }
3474
3475         supported = 0;
3476         p = xdr_reserve_space(xdr, 4);
3477         if (!p)
3478                 goto out;
3479         flavorsp = p++;         /* to be backfilled later */
3480
3481         for (i = 0; i < nflavs; i++) {
3482                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3483                 struct rpcsec_gss_info info;
3484
3485                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3486                         supported++;
3487                         p = xdr_reserve_space(xdr, 4 + 4 +
3488                                               XDR_LEN(info.oid.len) + 4 + 4);
3489                         if (!p)
3490                                 goto out;
3491                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3492                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3493                         *p++ = cpu_to_be32(info.qop);
3494                         *p++ = cpu_to_be32(info.service);
3495                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3496                         supported++;
3497                         p = xdr_reserve_space(xdr, 4);
3498                         if (!p)
3499                                 goto out;
3500                         *p++ = cpu_to_be32(pf);
3501                 } else {
3502                         if (report)
3503                                 pr_warn("NFS: SECINFO: security flavor %u "
3504                                         "is not supported\n", pf);
3505                 }
3506         }
3507
3508         if (nflavs != supported)
3509                 report = false;
3510         *flavorsp = htonl(supported);
3511         nfserr = 0;
3512 out:
3513         if (exp)
3514                 exp_put(exp);
3515         return nfserr;
3516 }
3517
3518 static __be32
3519 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3520                      struct nfsd4_secinfo *secinfo)
3521 {
3522         struct xdr_stream *xdr = &resp->xdr;
3523
3524         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3525 }
3526
3527 static __be32
3528 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3529                      struct nfsd4_secinfo_no_name *secinfo)
3530 {
3531         struct xdr_stream *xdr = &resp->xdr;
3532
3533         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3534 }
3535
3536 /*
3537  * The SETATTR encode routine is special -- it always encodes a bitmap,
3538  * regardless of the error status.
3539  */
3540 static __be32
3541 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3542 {
3543         struct xdr_stream *xdr = &resp->xdr;
3544         __be32 *p;
3545
3546         p = xdr_reserve_space(xdr, 16);
3547         if (!p)
3548                 return nfserr_resource;
3549         if (nfserr) {
3550                 *p++ = cpu_to_be32(3);
3551                 *p++ = cpu_to_be32(0);
3552                 *p++ = cpu_to_be32(0);
3553                 *p++ = cpu_to_be32(0);
3554         }
3555         else {
3556                 *p++ = cpu_to_be32(3);
3557                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3558                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3559                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3560         }
3561         return nfserr;
3562 }
3563
3564 static __be32
3565 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3566 {
3567         struct xdr_stream *xdr = &resp->xdr;
3568         __be32 *p;
3569
3570         if (!nfserr) {
3571                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3572                 if (!p)
3573                         return nfserr_resource;
3574                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3575                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3576                                                 NFS4_VERIFIER_SIZE);
3577         }
3578         else if (nfserr == nfserr_clid_inuse) {
3579                 p = xdr_reserve_space(xdr, 8);
3580                 if (!p)
3581                         return nfserr_resource;
3582                 *p++ = cpu_to_be32(0);
3583                 *p++ = cpu_to_be32(0);
3584         }
3585         return nfserr;
3586 }
3587
3588 static __be32
3589 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3590 {
3591         struct xdr_stream *xdr = &resp->xdr;
3592         __be32 *p;
3593
3594         if (!nfserr) {
3595                 p = xdr_reserve_space(xdr, 16);
3596                 if (!p)
3597                         return nfserr_resource;
3598                 *p++ = cpu_to_be32(write->wr_bytes_written);
3599                 *p++ = cpu_to_be32(write->wr_how_written);
3600                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3601                                                         NFS4_VERIFIER_SIZE);
3602         }
3603         return nfserr;
3604 }
3605
3606 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3607         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3608               1 << (OP_EXCHANGE_ID - 32) |
3609               1 << (OP_CREATE_SESSION - 32) |
3610               1 << (OP_DESTROY_SESSION - 32) |
3611               1 << (OP_DESTROY_CLIENTID - 32)
3612 };
3613
3614 static __be32
3615 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3616                          struct nfsd4_exchange_id *exid)
3617 {
3618         struct xdr_stream *xdr = &resp->xdr;
3619         __be32 *p;
3620         char *major_id;
3621         char *server_scope;
3622         int major_id_sz;
3623         int server_scope_sz;
3624         uint64_t minor_id = 0;
3625
3626         if (nfserr)
3627                 return nfserr;
3628
3629         major_id = utsname()->nodename;
3630         major_id_sz = strlen(major_id);
3631         server_scope = utsname()->nodename;
3632         server_scope_sz = strlen(server_scope);
3633
3634         p = xdr_reserve_space(xdr,
3635                 8 /* eir_clientid */ +
3636                 4 /* eir_sequenceid */ +
3637                 4 /* eir_flags */ +
3638                 4 /* spr_how */);
3639         if (!p)
3640                 return nfserr_resource;
3641
3642         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3643         *p++ = cpu_to_be32(exid->seqid);
3644         *p++ = cpu_to_be32(exid->flags);
3645
3646         *p++ = cpu_to_be32(exid->spa_how);
3647
3648         switch (exid->spa_how) {
3649         case SP4_NONE:
3650                 break;
3651         case SP4_MACH_CRED:
3652                 /* spo_must_enforce, spo_must_allow */
3653                 p = xdr_reserve_space(xdr, 16);
3654                 if (!p)
3655                         return nfserr_resource;
3656
3657                 /* spo_must_enforce bitmap: */
3658                 *p++ = cpu_to_be32(2);
3659                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3660                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3661                 /* empty spo_must_allow bitmap: */
3662                 *p++ = cpu_to_be32(0);
3663
3664                 break;
3665         default:
3666                 WARN_ON_ONCE(1);
3667         }
3668
3669         p = xdr_reserve_space(xdr,
3670                 8 /* so_minor_id */ +
3671                 4 /* so_major_id.len */ +
3672                 (XDR_QUADLEN(major_id_sz) * 4) +
3673                 4 /* eir_server_scope.len */ +
3674                 (XDR_QUADLEN(server_scope_sz) * 4) +
3675                 4 /* eir_server_impl_id.count (0) */);
3676         if (!p)
3677                 return nfserr_resource;
3678
3679         /* The server_owner struct */
3680         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3681         /* major id */
3682         p = xdr_encode_opaque(p, major_id, major_id_sz);
3683
3684         /* Server scope */
3685         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3686
3687         /* Implementation id */
3688         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3689         return 0;
3690 }
3691
3692 static __be32
3693 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3694                             struct nfsd4_create_session *sess)
3695 {
3696         struct xdr_stream *xdr = &resp->xdr;
3697         __be32 *p;
3698
3699         if (nfserr)
3700                 return nfserr;
3701
3702         p = xdr_reserve_space(xdr, 24);
3703         if (!p)
3704                 return nfserr_resource;
3705         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3706                                         NFS4_MAX_SESSIONID_LEN);
3707         *p++ = cpu_to_be32(sess->seqid);
3708         *p++ = cpu_to_be32(sess->flags);
3709
3710         p = xdr_reserve_space(xdr, 28);
3711         if (!p)
3712                 return nfserr_resource;
3713         *p++ = cpu_to_be32(0); /* headerpadsz */
3714         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3715         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3716         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3717         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3718         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3719         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3720
3721         if (sess->fore_channel.nr_rdma_attrs) {
3722                 p = xdr_reserve_space(xdr, 4);
3723                 if (!p)
3724                         return nfserr_resource;
3725                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3726         }
3727
3728         p = xdr_reserve_space(xdr, 28);
3729         if (!p)
3730                 return nfserr_resource;
3731         *p++ = cpu_to_be32(0); /* headerpadsz */
3732         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3733         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3734         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3735         *p++ = cpu_to_be32(sess->back_channel.maxops);
3736         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3737         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3738
3739         if (sess->back_channel.nr_rdma_attrs) {
3740                 p = xdr_reserve_space(xdr, 4);
3741                 if (!p)
3742                         return nfserr_resource;
3743                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3744         }
3745         return 0;
3746 }
3747
3748 static __be32
3749 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3750                       struct nfsd4_sequence *seq)
3751 {
3752         struct xdr_stream *xdr = &resp->xdr;
3753         __be32 *p;
3754
3755         if (nfserr)
3756                 return nfserr;
3757
3758         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3759         if (!p)
3760                 return nfserr_resource;
3761         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
3762                                         NFS4_MAX_SESSIONID_LEN);
3763         *p++ = cpu_to_be32(seq->seqid);
3764         *p++ = cpu_to_be32(seq->slotid);
3765         /* Note slotid's are numbered from zero: */
3766         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
3767         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
3768         *p++ = cpu_to_be32(seq->status_flags);
3769
3770         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3771         return 0;
3772 }
3773
3774 static __be32
3775 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3776                           struct nfsd4_test_stateid *test_stateid)
3777 {
3778         struct xdr_stream *xdr = &resp->xdr;
3779         struct nfsd4_test_stateid_id *stateid, *next;
3780         __be32 *p;
3781
3782         if (nfserr)
3783                 return nfserr;
3784
3785         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3786         if (!p)
3787                 return nfserr_resource;
3788         *p++ = htonl(test_stateid->ts_num_ids);
3789
3790         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3791                 *p++ = stateid->ts_id_status;
3792         }
3793
3794         return nfserr;
3795 }
3796
3797 static __be32
3798 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
3799                   struct nfsd4_seek *seek)
3800 {
3801         __be32 *p;
3802
3803         if (nfserr)
3804                 return nfserr;
3805
3806         p = xdr_reserve_space(&resp->xdr, 4 + 8);
3807         *p++ = cpu_to_be32(seek->seek_eof);
3808         p = xdr_encode_hyper(p, seek->seek_pos);
3809
3810         return nfserr;
3811 }
3812
3813 static __be32
3814 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3815 {
3816         return nfserr;
3817 }
3818
3819 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3820
3821 /*
3822  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3823  * since we don't need to filter out obsolete ops as this is
3824  * done in the decoding phase.
3825  */
3826 static nfsd4_enc nfsd4_enc_ops[] = {
3827         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3828         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3829         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3830         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3831         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3832         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3833         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3834         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3835         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3836         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3837         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3838         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3839         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3840         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3841         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3842         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3843         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3844         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3845         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3846         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3847         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3848         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3849         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3850         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3851         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3852         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3853         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3854         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3855         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3856         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3857         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3858         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3859         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3860         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3861         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3862         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3863         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3864
3865         /* NFSv4.1 operations */
3866         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3867         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3868         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3869         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3870         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
3871         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3872         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3873         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3874         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3875         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3876         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3877         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3878         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3879         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3880         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3881         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3882         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3883         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3884         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3885
3886         /* NFSv4.2 operations */
3887         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
3888         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_noop,
3889         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
3890         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
3891         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
3892         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
3893         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
3894         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
3895         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
3896         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
3897         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
3898         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
3899 };
3900
3901 /*
3902  * Calculate whether we still have space to encode repsize bytes.
3903  * There are two considerations:
3904  *     - For NFS versions >=4.1, the size of the reply must stay within
3905  *       session limits
3906  *     - For all NFS versions, we must stay within limited preallocated
3907  *       buffer space.
3908  *
3909  * This is called before the operation is processed, so can only provide
3910  * an upper estimate.  For some nonidempotent operations (such as
3911  * getattr), it's not necessarily a problem if that estimate is wrong,
3912  * as we can fail it after processing without significant side effects.
3913  */
3914 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
3915 {
3916         struct xdr_buf *buf = &resp->rqstp->rq_res;
3917         struct nfsd4_slot *slot = resp->cstate.slot;
3918
3919         if (buf->len + respsize <= buf->buflen)
3920                 return nfs_ok;
3921         if (!nfsd4_has_session(&resp->cstate))
3922                 return nfserr_resource;
3923         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
3924                 WARN_ON_ONCE(1);
3925                 return nfserr_rep_too_big_to_cache;
3926         }
3927         return nfserr_rep_too_big;
3928 }
3929
3930 void
3931 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3932 {
3933         struct xdr_stream *xdr = &resp->xdr;
3934         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3935         struct svc_rqst *rqstp = resp->rqstp;
3936         int post_err_offset;
3937         nfsd4_enc encoder;
3938         __be32 *p;
3939
3940         p = xdr_reserve_space(xdr, 8);
3941         if (!p) {
3942                 WARN_ON_ONCE(1);
3943                 return;
3944         }
3945         *p++ = cpu_to_be32(op->opnum);
3946         post_err_offset = xdr->buf->len;
3947
3948         if (op->opnum == OP_ILLEGAL)
3949                 goto status;
3950         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3951                !nfsd4_enc_ops[op->opnum]);
3952         encoder = nfsd4_enc_ops[op->opnum];
3953         op->status = encoder(resp, op->status, &op->u);
3954         xdr_commit_encode(xdr);
3955
3956         /* nfsd4_check_resp_size guarantees enough room for error status */
3957         if (!op->status) {
3958                 int space_needed = 0;
3959                 if (!nfsd4_last_compound_op(rqstp))
3960                         space_needed = COMPOUND_ERR_SLACK_SPACE;
3961                 op->status = nfsd4_check_resp_size(resp, space_needed);
3962         }
3963         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
3964                 struct nfsd4_slot *slot = resp->cstate.slot;
3965
3966                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
3967                         op->status = nfserr_rep_too_big_to_cache;
3968                 else
3969                         op->status = nfserr_rep_too_big;
3970         }
3971         if (op->status == nfserr_resource ||
3972             op->status == nfserr_rep_too_big ||
3973             op->status == nfserr_rep_too_big_to_cache) {
3974                 /*
3975                  * The operation may have already been encoded or
3976                  * partially encoded.  No op returns anything additional
3977                  * in the case of one of these three errors, so we can
3978                  * just truncate back to after the status.  But it's a
3979                  * bug if we had to do this on a non-idempotent op:
3980                  */
3981                 warn_on_nonidempotent_op(op);
3982                 xdr_truncate_encode(xdr, post_err_offset);
3983         }
3984         if (so) {
3985                 int len = xdr->buf->len - post_err_offset;
3986
3987                 so->so_replay.rp_status = op->status;
3988                 so->so_replay.rp_buflen = len;
3989                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
3990                                                 so->so_replay.rp_buf, len);
3991         }
3992 status:
3993         /* Note that op->status is already in network byte order: */
3994         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
3995 }
3996
3997 /*
3998  * Encode the reply stored in the stateowner reply cache
3999  *
4000  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4001  * previously sent already encoded operation.
4002  */
4003 void
4004 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4005 {
4006         __be32 *p;
4007         struct nfs4_replay *rp = op->replay;
4008
4009         BUG_ON(!rp);
4010
4011         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4012         if (!p) {
4013                 WARN_ON_ONCE(1);
4014                 return;
4015         }
4016         *p++ = cpu_to_be32(op->opnum);
4017         *p++ = rp->rp_status;  /* already xdr'ed */
4018
4019         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4020 }
4021
4022 int
4023 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4024 {
4025         return xdr_ressize_check(rqstp, p);
4026 }
4027
4028 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4029 {
4030         struct svc_rqst *rqstp = rq;
4031         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4032
4033         if (args->ops != args->iops) {
4034                 kfree(args->ops);
4035                 args->ops = args->iops;
4036         }
4037         kfree(args->tmpp);
4038         args->tmpp = NULL;
4039         while (args->to_free) {
4040                 struct svcxdr_tmpbuf *tb = args->to_free;
4041                 args->to_free = tb->next;
4042                 kfree(tb);
4043         }
4044         return 1;
4045 }
4046
4047 int
4048 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4049 {
4050         if (rqstp->rq_arg.head[0].iov_len % 4) {
4051                 /* client is nuts */
4052                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4053                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4054                 return 0;
4055         }
4056         args->p = p;
4057         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4058         args->pagelist = rqstp->rq_arg.pages;
4059         args->pagelen = rqstp->rq_arg.page_len;
4060         args->tmpp = NULL;
4061         args->to_free = NULL;
4062         args->ops = args->iops;
4063         args->rqstp = rqstp;
4064
4065         return !nfsd4_decode_compound(args);
4066 }
4067
4068 int
4069 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4070 {
4071         /*
4072          * All that remains is to write the tag and operation count...
4073          */
4074         struct xdr_buf *buf = resp->xdr.buf;
4075
4076         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4077                                  buf->tail[0].iov_len);
4078
4079         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4080
4081         p = resp->tagp;
4082         *p++ = htonl(resp->taglen);
4083         memcpy(p, resp->tag, resp->taglen);
4084         p += XDR_QUADLEN(resp->taglen);
4085         *p++ = htonl(resp->opcnt);
4086
4087         nfsd4_sequence_done(resp);
4088         return 1;
4089 }
4090
4091 /*
4092  * Local variables:
4093  *  c-basic-offset: 8
4094  * End:
4095  */