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  * TODO: Neil Brown made the following observation:  We currently
  36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37  * never release any of that until the request is complete.
  38  * It would be good to calculate a new maximum response size while
  39  * decoding the COMPOUND, and call svc_reserve with this number
  40  * at the end of nfs4svc_decode_compoundargs.
  41  */
  42
  43 #include <linux/slab.h>
  44 #include <linux/namei.h>
  45 #include <linux/statfs.h>
  46 #include <linux/utsname.h>
  47 #include <linux/pagemap.h>
  48 #include <linux/sunrpc/svcauth_gss.h>
  49
  50 #include "idmap.h"
  51 #include "acl.h"
  52 #include "xdr4.h"
  53 #include "vfs.h"
  54 #include "state.h"
  55 #include "cache.h"
  56 #include "netns.h"
  57
  58 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  59 #include <linux/security.h>
  60 #endif
  61
  62
  63 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  64
  65 /*
  66  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  67  * directory in order to indicate to the client that a filesystem boundary is present
  68  * We use a fixed fsid for a referral
  69  */
  70 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  71 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  72
  73 static __be32
  74 check_filename(char *str, int len)
  75 {
  76         int i;
  77
  78         if (len == 0)
  79                 return nfserr_inval;
  80         if (isdotent(str, len))
  81                 return nfserr_badname;
  82         for (i = 0; i < len; i++)
  83                 if (str[i] == '/')
  84                         return nfserr_badname;
  85         return 0;
  86 }
  87
  88 #define DECODE_HEAD                             \
  89         __be32 *p;                              \
  90         __be32 status
  91 #define DECODE_TAIL                             \
  92         status = 0;                             \
  93 out:                                            \
  94         return status;                          \
  95 xdr_error:                                      \
  96         dprintk("NFSD: xdr error (%s:%d)\n",    \
  97                         __FILE__, __LINE__);    \
  98         status = nfserr_bad_xdr;                \
  99         goto out
 100
 101 #define READ32(x)         (x) = ntohl(*p++)
 102 #define READ64(x)         do {                  \
 103         (x) = (u64)ntohl(*p++) << 32;           \
 104         (x) |= ntohl(*p++);                     \
 105 } while (0)
 106 #define READMEM(x,nbytes) do {                  \
 107         x = (char *)p;                          \
 108         p += XDR_QUADLEN(nbytes);               \
 109 } while (0)
 110 #define SAVEMEM(x,nbytes) do {                  \
 111         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 112                 savemem(argp, p, nbytes) :      \
 113                 (char *)p)) {                   \
 114                 dprintk("NFSD: xdr error (%s:%d)\n", \
 115                                 __FILE__, __LINE__); \
 116                 goto xdr_error;                 \
 117                 }                               \
 118         p += XDR_QUADLEN(nbytes);               \
 119 } while (0)
 120 #define COPYMEM(x,nbytes) do {                  \
 121         memcpy((x), p, nbytes);                 \
 122         p += XDR_QUADLEN(nbytes);               \
 123 } while (0)
 124
 125 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 126 #define READ_BUF(nbytes)  do {                  \
 127         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 128                 p = argp->p;                    \
 129                 argp->p += XDR_QUADLEN(nbytes); \
 130         } else if (!(p = read_buf(argp, nbytes))) { \
 131                 dprintk("NFSD: xdr error (%s:%d)\n", \
 132                                 __FILE__, __LINE__); \
 133                 goto xdr_error;                 \
 134         }                                       \
 135 } while (0)
 136
 137 static void next_decode_page(struct nfsd4_compoundargs *argp)
 138 {
 139         argp->p = page_address(argp->pagelist[0]);
 140         argp->pagelist++;
 141         if (argp->pagelen < PAGE_SIZE) {
 142                 argp->end = argp->p + (argp->pagelen>>2);
 143                 argp->pagelen = 0;
 144         } else {
 145                 argp->end = argp->p + (PAGE_SIZE>>2);
 146                 argp->pagelen -= PAGE_SIZE;
 147         }
 148 }
 149
 150 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 151 {
 152         /* We want more bytes than seem to be available.
 153          * Maybe we need a new page, maybe we have just run out
 154          */
 155         unsigned int avail = (char *)argp->end - (char *)argp->p;
 156         __be32 *p;
 157         if (avail + argp->pagelen < nbytes)
 158                 return NULL;
 159         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 160                 return NULL;
 161         /* ok, we can do it with the current plus the next page */
 162         if (nbytes <= sizeof(argp->tmp))
 163                 p = argp->tmp;
 164         else {
 165                 kfree(argp->tmpp);
 166                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 167                 if (!p)
 168                         return NULL;
 169
 170         }
 171         /*
 172          * The following memcpy is safe because read_buf is always
 173          * called with nbytes > avail, and the two cases above both
 174          * guarantee p points to at least nbytes bytes.
 175          */
 176         memcpy(p, argp->p, avail);
 177         next_decode_page(argp);
 178         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 179         argp->p += XDR_QUADLEN(nbytes - avail);
 180         return p;
 181 }
 182
 183 static int zero_clientid(clientid_t *clid)
 184 {
 185         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 186 }
 187
 188 /**
 189  * defer_free - mark an allocation as deferred freed
 190  * @argp: NFSv4 compound argument structure to be freed with
 191  * @release: release callback to free @p, typically kfree()
 192  * @p: pointer to be freed
 193  *
 194  * Marks @p to be freed when processing the compound operation
 195  * described in @argp finishes.
 196  */
 197 static int
 198 defer_free(struct nfsd4_compoundargs *argp,
 199                 void (*release)(const void *), void *p)
 200 {
 201         struct tmpbuf *tb;
 202
 203         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 204         if (!tb)
 205                 return -ENOMEM;
 206         tb->buf = p;
 207         tb->release = release;
 208         tb->next = argp->to_free;
 209         argp->to_free = tb;
 210         return 0;
 211 }
 212
 213 /**
 214  * savemem - duplicate a chunk of memory for later processing
 215  * @argp: NFSv4 compound argument structure to be freed with
 216  * @p: pointer to be duplicated
 217  * @nbytes: length to be duplicated
 218  *
 219  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 220  * that are preserved until processing of the NFSv4 compound
 221  * operation described by @argp finishes.
 222  */
 223 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 224 {
 225         if (p == argp->tmp) {
 226                 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
 227                 if (!p)
 228                         return NULL;
 229         } else {
 230                 BUG_ON(p != argp->tmpp);
 231                 argp->tmpp = NULL;
 232         }
 233         if (defer_free(argp, kfree, p)) {
 234                 kfree(p);
 235                 return NULL;
 236         } else
 237                 return (char *)p;
 238 }
 239
 240 static __be32
 241 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 242 {
 243         u32 bmlen;
 244         DECODE_HEAD;
 245
 246         bmval[0] = 0;
 247         bmval[1] = 0;
 248         bmval[2] = 0;
 249
 250         READ_BUF(4);
 251         READ32(bmlen);
 252         if (bmlen > 1000)
 253                 goto xdr_error;
 254
 255         READ_BUF(bmlen << 2);
 256         if (bmlen > 0)
 257                 READ32(bmval[0]);
 258         if (bmlen > 1)
 259                 READ32(bmval[1]);
 260         if (bmlen > 2)
 261                 READ32(bmval[2]);
 262
 263         DECODE_TAIL;
 264 }
 265
 266 static __be32
 267 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 268                    struct iattr *iattr, struct nfs4_acl **acl,
 269                    struct xdr_netobj *label)
 270 {
 271         int expected_len, len = 0;
 272         u32 dummy32;
 273         char *buf;
 274
 275         DECODE_HEAD;
 276         iattr->ia_valid = 0;
 277         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 278                 return status;
 279
 280         READ_BUF(4);
 281         READ32(expected_len);
 282
 283         if (bmval[0] & FATTR4_WORD0_SIZE) {
 284                 READ_BUF(8);
 285                 len += 8;
 286                 READ64(iattr->ia_size);
 287                 iattr->ia_valid |= ATTR_SIZE;
 288         }
 289         if (bmval[0] & FATTR4_WORD0_ACL) {
 290                 u32 nace;
 291                 struct nfs4_ace *ace;
 292
 293                 READ_BUF(4); len += 4;
 294                 READ32(nace);
 295
 296                 if (nace > NFS4_ACL_MAX)
 297                         return nfserr_resource;
 298
 299                 *acl = nfs4_acl_new(nace);
 300                 if (*acl == NULL)
 301                         return nfserr_jukebox;
 302
 303                 defer_free(argp, kfree, *acl);
 304
 305                 (*acl)->naces = nace;
 306                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 307                         READ_BUF(16); len += 16;
 308                         READ32(ace->type);
 309                         READ32(ace->flag);
 310                         READ32(ace->access_mask);
 311                         READ32(dummy32);
 312                         READ_BUF(dummy32);
 313                         len += XDR_QUADLEN(dummy32) << 2;
 314                         READMEM(buf, dummy32);
 315                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 316                         status = nfs_ok;
 317                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 318                                 ;
 319                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 320                                 status = nfsd_map_name_to_gid(argp->rqstp,
 321                                                 buf, dummy32, &ace->who_gid);
 322                         else
 323                                 status = nfsd_map_name_to_uid(argp->rqstp,
 324                                                 buf, dummy32, &ace->who_uid);
 325                         if (status)
 326                                 return status;
 327                 }
 328         } else
 329                 *acl = NULL;
 330         if (bmval[1] & FATTR4_WORD1_MODE) {
 331                 READ_BUF(4);
 332                 len += 4;
 333                 READ32(iattr->ia_mode);
 334                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 335                 iattr->ia_valid |= ATTR_MODE;
 336         }
 337         if (bmval[1] & FATTR4_WORD1_OWNER) {
 338                 READ_BUF(4);
 339                 len += 4;
 340                 READ32(dummy32);
 341                 READ_BUF(dummy32);
 342                 len += (XDR_QUADLEN(dummy32) << 2);
 343                 READMEM(buf, dummy32);
 344                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 345                         return status;
 346                 iattr->ia_valid |= ATTR_UID;
 347         }
 348         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 349                 READ_BUF(4);
 350                 len += 4;
 351                 READ32(dummy32);
 352                 READ_BUF(dummy32);
 353                 len += (XDR_QUADLEN(dummy32) << 2);
 354                 READMEM(buf, dummy32);
 355                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 356                         return status;
 357                 iattr->ia_valid |= ATTR_GID;
 358         }
 359         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 360                 READ_BUF(4);
 361                 len += 4;
 362                 READ32(dummy32);
 363                 switch (dummy32) {
 364                 case NFS4_SET_TO_CLIENT_TIME:
 365                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 366                            all 32 bits of 'nseconds'. */
 367                         READ_BUF(12);
 368                         len += 12;
 369                         READ64(iattr->ia_atime.tv_sec);
 370                         READ32(iattr->ia_atime.tv_nsec);
 371                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 372                                 return nfserr_inval;
 373                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 374                         break;
 375                 case NFS4_SET_TO_SERVER_TIME:
 376                         iattr->ia_valid |= ATTR_ATIME;
 377                         break;
 378                 default:
 379                         goto xdr_error;
 380                 }
 381         }
 382         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 383                 READ_BUF(4);
 384                 len += 4;
 385                 READ32(dummy32);
 386                 switch (dummy32) {
 387                 case NFS4_SET_TO_CLIENT_TIME:
 388                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 389                            all 32 bits of 'nseconds'. */
 390                         READ_BUF(12);
 391                         len += 12;
 392                         READ64(iattr->ia_mtime.tv_sec);
 393                         READ32(iattr->ia_mtime.tv_nsec);
 394                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 395                                 return nfserr_inval;
 396                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 397                         break;
 398                 case NFS4_SET_TO_SERVER_TIME:
 399                         iattr->ia_valid |= ATTR_MTIME;
 400                         break;
 401                 default:
 402                         goto xdr_error;
 403                 }
 404         }
 405
 406         label->len = 0;
 407 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 408         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 409                 READ_BUF(4);
 410                 len += 4;
 411                 READ32(dummy32); /* lfs: we don't use it */
 412                 READ_BUF(4);
 413                 len += 4;
 414                 READ32(dummy32); /* pi: we don't use it either */
 415                 READ_BUF(4);
 416                 len += 4;
 417                 READ32(dummy32);
 418                 READ_BUF(dummy32);
 419                 if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
 420                         return nfserr_badlabel;
 421                 len += (XDR_QUADLEN(dummy32) << 2);
 422                 READMEM(buf, dummy32);
 423                 label->data = kzalloc(dummy32 + 1, GFP_KERNEL);
 424                 if (!label->data)
 425                         return nfserr_jukebox;
 426                 label->len = dummy32;
 427                 defer_free(argp, kfree, label->data);
 428                 memcpy(label->data, buf, dummy32);
 429         }
 430 #endif
 431
 432         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 433             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 434             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 435                 READ_BUF(expected_len - len);
 436         else if (len != expected_len)
 437                 goto xdr_error;
 438
 439         DECODE_TAIL;
 440 }
 441
 442 static __be32
 443 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 444 {
 445         DECODE_HEAD;
 446
 447         READ_BUF(sizeof(stateid_t));
 448         READ32(sid->si_generation);
 449         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 450
 451         DECODE_TAIL;
 452 }
 453
 454 static __be32
 455 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 456 {
 457         DECODE_HEAD;
 458
 459         READ_BUF(4);
 460         READ32(access->ac_req_access);
 461
 462         DECODE_TAIL;
 463 }
 464
 465 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 466 {
 467         DECODE_HEAD;
 468         u32 dummy, uid, gid;
 469         char *machine_name;
 470         int i;
 471         int nr_secflavs;
 472
 473         /* callback_sec_params4 */
 474         READ_BUF(4);
 475         READ32(nr_secflavs);
 476         if (nr_secflavs)
 477                 cbs->flavor = (u32)(-1);
 478         else
 479                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 480                 cbs->flavor = 0;
 481         for (i = 0; i < nr_secflavs; ++i) {
 482                 READ_BUF(4);
 483                 READ32(dummy);
 484                 switch (dummy) {
 485                 case RPC_AUTH_NULL:
 486                         /* Nothing to read */
 487                         if (cbs->flavor == (u32)(-1))
 488                                 cbs->flavor = RPC_AUTH_NULL;
 489                         break;
 490                 case RPC_AUTH_UNIX:
 491                         READ_BUF(8);
 492                         /* stamp */
 493                         READ32(dummy);
 494
 495                         /* machine name */
 496                         READ32(dummy);
 497                         READ_BUF(dummy);
 498                         SAVEMEM(machine_name, dummy);
 499
 500                         /* uid, gid */
 501                         READ_BUF(8);
 502                         READ32(uid);
 503                         READ32(gid);
 504
 505                         /* more gids */
 506                         READ_BUF(4);
 507                         READ32(dummy);
 508                         READ_BUF(dummy * 4);
 509                         if (cbs->flavor == (u32)(-1)) {
 510                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 511                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 512                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 513                                         cbs->uid = kuid;
 514                                         cbs->gid = kgid;
 515                                         cbs->flavor = RPC_AUTH_UNIX;
 516                                 } else {
 517                                         dprintk("RPC_AUTH_UNIX with invalid"
 518                                                 "uid or gid ignoring!\n");
 519                                 }
 520                         }
 521                         break;
 522                 case RPC_AUTH_GSS:
 523                         dprintk("RPC_AUTH_GSS callback secflavor "
 524                                 "not supported!\n");
 525                         READ_BUF(8);
 526                         /* gcbp_service */
 527                         READ32(dummy);
 528                         /* gcbp_handle_from_server */
 529                         READ32(dummy);
 530                         READ_BUF(dummy);
 531                         p += XDR_QUADLEN(dummy);
 532                         /* gcbp_handle_from_client */
 533                         READ_BUF(4);
 534                         READ32(dummy);
 535                         READ_BUF(dummy);
 536                         break;
 537                 default:
 538                         dprintk("Illegal callback secflavor\n");
 539                         return nfserr_inval;
 540                 }
 541         }
 542         DECODE_TAIL;
 543 }
 544
 545 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 546 {
 547         DECODE_HEAD;
 548
 549         READ_BUF(4);
 550         READ32(bc->bc_cb_program);
 551         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 552
 553         DECODE_TAIL;
 554 }
 555
 556 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 557 {
 558         DECODE_HEAD;
 559
 560         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 561         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 562         READ32(bcts->dir);
 563         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 564          * could help us figure out we should be using it. */
 565         DECODE_TAIL;
 566 }
 567
 568 static __be32
 569 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 570 {
 571         DECODE_HEAD;
 572
 573         READ_BUF(4);
 574         READ32(close->cl_seqid);
 575         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 576
 577         DECODE_TAIL;
 578 }
 579
 580
 581 static __be32
 582 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 583 {
 584         DECODE_HEAD;
 585
 586         READ_BUF(12);
 587         READ64(commit->co_offset);
 588         READ32(commit->co_count);
 589
 590         DECODE_TAIL;
 591 }
 592
 593 static __be32
 594 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 595 {
 596         DECODE_HEAD;
 597
 598         READ_BUF(4);
 599         READ32(create->cr_type);
 600         switch (create->cr_type) {
 601         case NF4LNK:
 602                 READ_BUF(4);
 603                 READ32(create->cr_linklen);
 604                 READ_BUF(create->cr_linklen);
 605                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 606                 break;
 607         case NF4BLK:
 608         case NF4CHR:
 609                 READ_BUF(8);
 610                 READ32(create->cr_specdata1);
 611                 READ32(create->cr_specdata2);
 612                 break;
 613         case NF4SOCK:
 614         case NF4FIFO:
 615         case NF4DIR:
 616         default:
 617                 break;
 618         }
 619
 620         READ_BUF(4);
 621         READ32(create->cr_namelen);
 622         READ_BUF(create->cr_namelen);
 623         SAVEMEM(create->cr_name, create->cr_namelen);
 624         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 625                 return status;
 626
 627         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 628                                     &create->cr_acl, &create->cr_label);
 629         if (status)
 630                 goto out;
 631
 632         DECODE_TAIL;
 633 }
 634
 635 static inline __be32
 636 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 637 {
 638         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 639 }
 640
 641 static inline __be32
 642 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 643 {
 644         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 645 }
 646
 647 static __be32
 648 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 649 {
 650         DECODE_HEAD;
 651
 652         READ_BUF(4);
 653         READ32(link->li_namelen);
 654         READ_BUF(link->li_namelen);
 655         SAVEMEM(link->li_name, link->li_namelen);
 656         if ((status = check_filename(link->li_name, link->li_namelen)))
 657                 return status;
 658
 659         DECODE_TAIL;
 660 }
 661
 662 static __be32
 663 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 664 {
 665         DECODE_HEAD;
 666
 667         /*
 668         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 669         */
 670         READ_BUF(28);
 671         READ32(lock->lk_type);
 672         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 673                 goto xdr_error;
 674         READ32(lock->lk_reclaim);
 675         READ64(lock->lk_offset);
 676         READ64(lock->lk_length);
 677         READ32(lock->lk_is_new);
 678
 679         if (lock->lk_is_new) {
 680                 READ_BUF(4);
 681                 READ32(lock->lk_new_open_seqid);
 682                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 683                 if (status)
 684                         return status;
 685                 READ_BUF(8 + sizeof(clientid_t));
 686                 READ32(lock->lk_new_lock_seqid);
 687                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 688                 READ32(lock->lk_new_owner.len);
 689                 READ_BUF(lock->lk_new_owner.len);
 690                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 691         } else {
 692                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 693                 if (status)
 694                         return status;
 695                 READ_BUF(4);
 696                 READ32(lock->lk_old_lock_seqid);
 697         }
 698
 699         DECODE_TAIL;
 700 }
 701
 702 static __be32
 703 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 704 {
 705         DECODE_HEAD;
 706
 707         READ_BUF(32);
 708         READ32(lockt->lt_type);
 709         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 710                 goto xdr_error;
 711         READ64(lockt->lt_offset);
 712         READ64(lockt->lt_length);
 713         COPYMEM(&lockt->lt_clientid, 8);
 714         READ32(lockt->lt_owner.len);
 715         READ_BUF(lockt->lt_owner.len);
 716         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 717
 718         DECODE_TAIL;
 719 }
 720
 721 static __be32
 722 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 723 {
 724         DECODE_HEAD;
 725
 726         READ_BUF(8);
 727         READ32(locku->lu_type);
 728         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 729                 goto xdr_error;
 730         READ32(locku->lu_seqid);
 731         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 732         if (status)
 733                 return status;
 734         READ_BUF(16);
 735         READ64(locku->lu_offset);
 736         READ64(locku->lu_length);
 737
 738         DECODE_TAIL;
 739 }
 740
 741 static __be32
 742 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 743 {
 744         DECODE_HEAD;
 745
 746         READ_BUF(4);
 747         READ32(lookup->lo_len);
 748         READ_BUF(lookup->lo_len);
 749         SAVEMEM(lookup->lo_name, lookup->lo_len);
 750         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 751                 return status;
 752
 753         DECODE_TAIL;
 754 }
 755
 756 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 757 {
 758         __be32 *p;
 759         u32 w;
 760
 761         READ_BUF(4);
 762         READ32(w);
 763         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 764         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 765         if (deleg_when)
 766                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 767
 768         switch (w & NFS4_SHARE_ACCESS_MASK) {
 769         case NFS4_SHARE_ACCESS_READ:
 770         case NFS4_SHARE_ACCESS_WRITE:
 771         case NFS4_SHARE_ACCESS_BOTH:
 772                 break;
 773         default:
 774                 return nfserr_bad_xdr;
 775         }
 776         w &= ~NFS4_SHARE_ACCESS_MASK;
 777         if (!w)
 778                 return nfs_ok;
 779         if (!argp->minorversion)
 780                 return nfserr_bad_xdr;
 781         switch (w & NFS4_SHARE_WANT_MASK) {
 782         case NFS4_SHARE_WANT_NO_PREFERENCE:
 783         case NFS4_SHARE_WANT_READ_DELEG:
 784         case NFS4_SHARE_WANT_WRITE_DELEG:
 785         case NFS4_SHARE_WANT_ANY_DELEG:
 786         case NFS4_SHARE_WANT_NO_DELEG:
 787         case NFS4_SHARE_WANT_CANCEL:
 788                 break;
 789         default:
 790                 return nfserr_bad_xdr;
 791         }
 792         w &= ~NFS4_SHARE_WANT_MASK;
 793         if (!w)
 794                 return nfs_ok;
 795
 796         if (!deleg_when)        /* open_downgrade */
 797                 return nfserr_inval;
 798         switch (w) {
 799         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 800         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 801         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 802               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 803                 return nfs_ok;
 804         }
 805 xdr_error:
 806         return nfserr_bad_xdr;
 807 }
 808
 809 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 810 {
 811         __be32 *p;
 812
 813         READ_BUF(4);
 814         READ32(*x);
 815         /* Note: unlinke access bits, deny bits may be zero. */
 816         if (*x & ~NFS4_SHARE_DENY_BOTH)
 817                 return nfserr_bad_xdr;
 818         return nfs_ok;
 819 xdr_error:
 820         return nfserr_bad_xdr;
 821 }
 822
 823 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 824 {
 825         __be32 *p;
 826
 827         READ_BUF(4);
 828         READ32(o->len);
 829
 830         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 831                 return nfserr_bad_xdr;
 832
 833         READ_BUF(o->len);
 834         SAVEMEM(o->data, o->len);
 835         return nfs_ok;
 836 xdr_error:
 837         return nfserr_bad_xdr;
 838 }
 839
 840 static __be32
 841 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 842 {
 843         DECODE_HEAD;
 844         u32 dummy;
 845
 846         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 847         open->op_iattr.ia_valid = 0;
 848         open->op_openowner = NULL;
 849
 850         open->op_xdr_error = 0;
 851         /* seqid, share_access, share_deny, clientid, ownerlen */
 852         READ_BUF(4);
 853         READ32(open->op_seqid);
 854         /* decode, yet ignore deleg_when until supported */
 855         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 856                                            &open->op_deleg_want, &dummy);
 857         if (status)
 858                 goto xdr_error;
 859         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 860         if (status)
 861                 goto xdr_error;
 862         READ_BUF(sizeof(clientid_t));
 863         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 864         status = nfsd4_decode_opaque(argp, &open->op_owner);
 865         if (status)
 866                 goto xdr_error;
 867         READ_BUF(4);
 868         READ32(open->op_create);
 869         switch (open->op_create) {
 870         case NFS4_OPEN_NOCREATE:
 871                 break;
 872         case NFS4_OPEN_CREATE:
 873                 READ_BUF(4);
 874                 READ32(open->op_createmode);
 875                 switch (open->op_createmode) {
 876                 case NFS4_CREATE_UNCHECKED:
 877                 case NFS4_CREATE_GUARDED:
 878                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 879                                 &open->op_iattr, &open->op_acl, &open->op_label);
 880                         if (status)
 881                                 goto out;
 882                         break;
 883                 case NFS4_CREATE_EXCLUSIVE:
 884                         READ_BUF(NFS4_VERIFIER_SIZE);
 885                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 886                         break;
 887                 case NFS4_CREATE_EXCLUSIVE4_1:
 888                         if (argp->minorversion < 1)
 889                                 goto xdr_error;
 890                         READ_BUF(NFS4_VERIFIER_SIZE);
 891                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 892                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 893                                 &open->op_iattr, &open->op_acl, &open->op_label);
 894                         if (status)
 895                                 goto out;
 896                         break;
 897                 default:
 898                         goto xdr_error;
 899                 }
 900                 break;
 901         default:
 902                 goto xdr_error;
 903         }
 904
 905         /* open_claim */
 906         READ_BUF(4);
 907         READ32(open->op_claim_type);
 908         switch (open->op_claim_type) {
 909         case NFS4_OPEN_CLAIM_NULL:
 910         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 911                 READ_BUF(4);
 912                 READ32(open->op_fname.len);
 913                 READ_BUF(open->op_fname.len);
 914                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 915                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 916                         return status;
 917                 break;
 918         case NFS4_OPEN_CLAIM_PREVIOUS:
 919                 READ_BUF(4);
 920                 READ32(open->op_delegate_type);
 921                 break;
 922         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 923                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 924                 if (status)
 925                         return status;
 926                 READ_BUF(4);
 927                 READ32(open->op_fname.len);
 928                 READ_BUF(open->op_fname.len);
 929                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 930                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 931                         return status;
 932                 break;
 933         case NFS4_OPEN_CLAIM_FH:
 934         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 935                 if (argp->minorversion < 1)
 936                         goto xdr_error;
 937                 /* void */
 938                 break;
 939         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 940                 if (argp->minorversion < 1)
 941                         goto xdr_error;
 942                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 943                 if (status)
 944                         return status;
 945                 break;
 946         default:
 947                 goto xdr_error;
 948         }
 949
 950         DECODE_TAIL;
 951 }
 952
 953 static __be32
 954 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 955 {
 956         DECODE_HEAD;
 957
 958         if (argp->minorversion >= 1)
 959                 return nfserr_notsupp;
 960
 961         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 962         if (status)
 963                 return status;
 964         READ_BUF(4);
 965         READ32(open_conf->oc_seqid);
 966
 967         DECODE_TAIL;
 968 }
 969
 970 static __be32
 971 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 972 {
 973         DECODE_HEAD;
 974
 975         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 976         if (status)
 977                 return status;
 978         READ_BUF(4);
 979         READ32(open_down->od_seqid);
 980         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 981                                            &open_down->od_deleg_want, NULL);
 982         if (status)
 983                 return status;
 984         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 985         if (status)
 986                 return status;
 987         DECODE_TAIL;
 988 }
 989
 990 static __be32
 991 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 992 {
 993         DECODE_HEAD;
 994
 995         READ_BUF(4);
 996         READ32(putfh->pf_fhlen);
 997         if (putfh->pf_fhlen > NFS4_FHSIZE)
 998                 goto xdr_error;
 999         READ_BUF(putfh->pf_fhlen);
1000         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1001
1002         DECODE_TAIL;
1003 }
1004
1005 static __be32
1006 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1007 {
1008         if (argp->minorversion == 0)
1009                 return nfs_ok;
1010         return nfserr_notsupp;
1011 }
1012
1013 static __be32
1014 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1015 {
1016         DECODE_HEAD;
1017
1018         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1019         if (status)
1020                 return status;
1021         READ_BUF(12);
1022         READ64(read->rd_offset);
1023         READ32(read->rd_length);
1024
1025         DECODE_TAIL;
1026 }
1027
1028 static __be32
1029 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1030 {
1031         DECODE_HEAD;
1032
1033         READ_BUF(24);
1034         READ64(readdir->rd_cookie);
1035         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1036         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
1037         READ32(readdir->rd_maxcount);
1038         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1039                 goto out;
1040
1041         DECODE_TAIL;
1042 }
1043
1044 static __be32
1045 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1046 {
1047         DECODE_HEAD;
1048
1049         READ_BUF(4);
1050         READ32(remove->rm_namelen);
1051         READ_BUF(remove->rm_namelen);
1052         SAVEMEM(remove->rm_name, remove->rm_namelen);
1053         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1054                 return status;
1055
1056         DECODE_TAIL;
1057 }
1058
1059 static __be32
1060 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1061 {
1062         DECODE_HEAD;
1063
1064         READ_BUF(4);
1065         READ32(rename->rn_snamelen);
1066         READ_BUF(rename->rn_snamelen + 4);
1067         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1068         READ32(rename->rn_tnamelen);
1069         READ_BUF(rename->rn_tnamelen);
1070         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1071         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1072                 return status;
1073         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1074                 return status;
1075
1076         DECODE_TAIL;
1077 }
1078
1079 static __be32
1080 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1081 {
1082         DECODE_HEAD;
1083
1084         if (argp->minorversion >= 1)
1085                 return nfserr_notsupp;
1086
1087         READ_BUF(sizeof(clientid_t));
1088         COPYMEM(clientid, sizeof(clientid_t));
1089
1090         DECODE_TAIL;
1091 }
1092
1093 static __be32
1094 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1095                      struct nfsd4_secinfo *secinfo)
1096 {
1097         DECODE_HEAD;
1098
1099         READ_BUF(4);
1100         READ32(secinfo->si_namelen);
1101         READ_BUF(secinfo->si_namelen);
1102         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1103         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1104         if (status)
1105                 return status;
1106         DECODE_TAIL;
1107 }
1108
1109 static __be32
1110 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1111                      struct nfsd4_secinfo_no_name *sin)
1112 {
1113         DECODE_HEAD;
1114
1115         READ_BUF(4);
1116         READ32(sin->sin_style);
1117         DECODE_TAIL;
1118 }
1119
1120 static __be32
1121 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1122 {
1123         __be32 status;
1124
1125         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1126         if (status)
1127                 return status;
1128         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1129                                   &setattr->sa_acl, &setattr->sa_label);
1130 }
1131
1132 static __be32
1133 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1134 {
1135         DECODE_HEAD;
1136
1137         if (argp->minorversion >= 1)
1138                 return nfserr_notsupp;
1139
1140         READ_BUF(NFS4_VERIFIER_SIZE);
1141         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1142
1143         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1144         if (status)
1145                 return nfserr_bad_xdr;
1146         READ_BUF(8);
1147         READ32(setclientid->se_callback_prog);
1148         READ32(setclientid->se_callback_netid_len);
1149
1150         READ_BUF(setclientid->se_callback_netid_len + 4);
1151         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1152         READ32(setclientid->se_callback_addr_len);
1153
1154         READ_BUF(setclientid->se_callback_addr_len + 4);
1155         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1156         READ32(setclientid->se_callback_ident);
1157
1158         DECODE_TAIL;
1159 }
1160
1161 static __be32
1162 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1163 {
1164         DECODE_HEAD;
1165
1166         if (argp->minorversion >= 1)
1167                 return nfserr_notsupp;
1168
1169         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1170         COPYMEM(&scd_c->sc_clientid, 8);
1171         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1172
1173         DECODE_TAIL;
1174 }
1175
1176 /* Also used for NVERIFY */
1177 static __be32
1178 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1179 {
1180         DECODE_HEAD;
1181
1182         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1183                 goto out;
1184
1185         /* For convenience's sake, we compare raw xdr'd attributes in
1186          * nfsd4_proc_verify */
1187
1188         READ_BUF(4);
1189         READ32(verify->ve_attrlen);
1190         READ_BUF(verify->ve_attrlen);
1191         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1192
1193         DECODE_TAIL;
1194 }
1195
1196 static __be32
1197 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1198 {
1199         int avail;
1200         int len;
1201         DECODE_HEAD;
1202
1203         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1204         if (status)
1205                 return status;
1206         READ_BUF(16);
1207         READ64(write->wr_offset);
1208         READ32(write->wr_stable_how);
1209         if (write->wr_stable_how > 2)
1210                 goto xdr_error;
1211         READ32(write->wr_buflen);
1212
1213         /* Sorry .. no magic macros for this.. *
1214          * READ_BUF(write->wr_buflen);
1215          * SAVEMEM(write->wr_buf, write->wr_buflen);
1216          */
1217         avail = (char*)argp->end - (char*)argp->p;
1218         if (avail + argp->pagelen < write->wr_buflen) {
1219                 dprintk("NFSD: xdr error (%s:%d)\n",
1220                                 __FILE__, __LINE__);
1221                 goto xdr_error;
1222         }
1223         write->wr_head.iov_base = p;
1224         write->wr_head.iov_len = avail;
1225         WARN_ON(avail != (XDR_QUADLEN(avail) << 2));
1226         write->wr_pagelist = argp->pagelist;
1227
1228         len = XDR_QUADLEN(write->wr_buflen) << 2;
1229         if (len >= avail) {
1230                 int pages;
1231
1232                 len -= avail;
1233
1234                 pages = len >> PAGE_SHIFT;
1235                 argp->pagelist += pages;
1236                 argp->pagelen -= pages * PAGE_SIZE;
1237                 len -= pages * PAGE_SIZE;
1238
1239                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1240                 argp->pagelist++;
1241                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1242         }
1243         argp->p += XDR_QUADLEN(len);
1244
1245         DECODE_TAIL;
1246 }
1247
1248 static __be32
1249 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1250 {
1251         DECODE_HEAD;
1252
1253         if (argp->minorversion >= 1)
1254                 return nfserr_notsupp;
1255
1256         READ_BUF(12);
1257         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1258         READ32(rlockowner->rl_owner.len);
1259         READ_BUF(rlockowner->rl_owner.len);
1260         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1261
1262         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1263                 return nfserr_inval;
1264         DECODE_TAIL;
1265 }
1266
1267 static __be32
1268 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1269                          struct nfsd4_exchange_id *exid)
1270 {
1271         int dummy, tmp;
1272         DECODE_HEAD;
1273
1274         READ_BUF(NFS4_VERIFIER_SIZE);
1275         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1276
1277         status = nfsd4_decode_opaque(argp, &exid->clname);
1278         if (status)
1279                 return nfserr_bad_xdr;
1280
1281         READ_BUF(4);
1282         READ32(exid->flags);
1283
1284         /* Ignore state_protect4_a */
1285         READ_BUF(4);
1286         READ32(exid->spa_how);
1287         switch (exid->spa_how) {
1288         case SP4_NONE:
1289                 break;
1290         case SP4_MACH_CRED:
1291                 /* spo_must_enforce */
1292                 READ_BUF(4);
1293                 READ32(dummy);
1294                 READ_BUF(dummy * 4);
1295                 p += dummy;
1296
1297                 /* spo_must_allow */
1298                 READ_BUF(4);
1299                 READ32(dummy);
1300                 READ_BUF(dummy * 4);
1301                 p += dummy;
1302                 break;
1303         case SP4_SSV:
1304                 /* ssp_ops */
1305                 READ_BUF(4);
1306                 READ32(dummy);
1307                 READ_BUF(dummy * 4);
1308                 p += dummy;
1309
1310                 READ_BUF(4);
1311                 READ32(dummy);
1312                 READ_BUF(dummy * 4);
1313                 p += dummy;
1314
1315                 /* ssp_hash_algs<> */
1316                 READ_BUF(4);
1317                 READ32(tmp);
1318                 while (tmp--) {
1319                         READ_BUF(4);
1320                         READ32(dummy);
1321                         READ_BUF(dummy);
1322                         p += XDR_QUADLEN(dummy);
1323                 }
1324
1325                 /* ssp_encr_algs<> */
1326                 READ_BUF(4);
1327                 READ32(tmp);
1328                 while (tmp--) {
1329                         READ_BUF(4);
1330                         READ32(dummy);
1331                         READ_BUF(dummy);
1332                         p += XDR_QUADLEN(dummy);
1333                 }
1334
1335                 /* ssp_window and ssp_num_gss_handles */
1336                 READ_BUF(8);
1337                 READ32(dummy);
1338                 READ32(dummy);
1339                 break;
1340         default:
1341                 goto xdr_error;
1342         }
1343
1344         /* Ignore Implementation ID */
1345         READ_BUF(4);    /* nfs_impl_id4 array length */
1346         READ32(dummy);
1347
1348         if (dummy > 1)
1349                 goto xdr_error;
1350
1351         if (dummy == 1) {
1352                 /* nii_domain */
1353                 READ_BUF(4);
1354                 READ32(dummy);
1355                 READ_BUF(dummy);
1356                 p += XDR_QUADLEN(dummy);
1357
1358                 /* nii_name */
1359                 READ_BUF(4);
1360                 READ32(dummy);
1361                 READ_BUF(dummy);
1362                 p += XDR_QUADLEN(dummy);
1363
1364                 /* nii_date */
1365                 READ_BUF(12);
1366                 p += 3;
1367         }
1368         DECODE_TAIL;
1369 }
1370
1371 static __be32
1372 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1373                             struct nfsd4_create_session *sess)
1374 {
1375         DECODE_HEAD;
1376         u32 dummy;
1377
1378         READ_BUF(16);
1379         COPYMEM(&sess->clientid, 8);
1380         READ32(sess->seqid);
1381         READ32(sess->flags);
1382
1383         /* Fore channel attrs */
1384         READ_BUF(28);
1385         READ32(dummy); /* headerpadsz is always 0 */
1386         READ32(sess->fore_channel.maxreq_sz);
1387         READ32(sess->fore_channel.maxresp_sz);
1388         READ32(sess->fore_channel.maxresp_cached);
1389         READ32(sess->fore_channel.maxops);
1390         READ32(sess->fore_channel.maxreqs);
1391         READ32(sess->fore_channel.nr_rdma_attrs);
1392         if (sess->fore_channel.nr_rdma_attrs == 1) {
1393                 READ_BUF(4);
1394                 READ32(sess->fore_channel.rdma_attrs);
1395         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1396                 dprintk("Too many fore channel attr bitmaps!\n");
1397                 goto xdr_error;
1398         }
1399
1400         /* Back channel attrs */
1401         READ_BUF(28);
1402         READ32(dummy); /* headerpadsz is always 0 */
1403         READ32(sess->back_channel.maxreq_sz);
1404         READ32(sess->back_channel.maxresp_sz);
1405         READ32(sess->back_channel.maxresp_cached);
1406         READ32(sess->back_channel.maxops);
1407         READ32(sess->back_channel.maxreqs);
1408         READ32(sess->back_channel.nr_rdma_attrs);
1409         if (sess->back_channel.nr_rdma_attrs == 1) {
1410                 READ_BUF(4);
1411                 READ32(sess->back_channel.rdma_attrs);
1412         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1413                 dprintk("Too many back channel attr bitmaps!\n");
1414                 goto xdr_error;
1415         }
1416
1417         READ_BUF(4);
1418         READ32(sess->callback_prog);
1419         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1420         DECODE_TAIL;
1421 }
1422
1423 static __be32
1424 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1425                              struct nfsd4_destroy_session *destroy_session)
1426 {
1427         DECODE_HEAD;
1428         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1429         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1430
1431         DECODE_TAIL;
1432 }
1433
1434 static __be32
1435 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1436                           struct nfsd4_free_stateid *free_stateid)
1437 {
1438         DECODE_HEAD;
1439
1440         READ_BUF(sizeof(stateid_t));
1441         READ32(free_stateid->fr_stateid.si_generation);
1442         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1443
1444         DECODE_TAIL;
1445 }
1446
1447 static __be32
1448 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1449                       struct nfsd4_sequence *seq)
1450 {
1451         DECODE_HEAD;
1452
1453         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1454         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1455         READ32(seq->seqid);
1456         READ32(seq->slotid);
1457         READ32(seq->maxslots);
1458         READ32(seq->cachethis);
1459
1460         DECODE_TAIL;
1461 }
1462
1463 static __be32
1464 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1465 {
1466         int i;
1467         __be32 *p, status;
1468         struct nfsd4_test_stateid_id *stateid;
1469
1470         READ_BUF(4);
1471         test_stateid->ts_num_ids = ntohl(*p++);
1472
1473         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1474
1475         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1476                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1477                 if (!stateid) {
1478                         status = nfserrno(-ENOMEM);
1479                         goto out;
1480                 }
1481
1482                 defer_free(argp, kfree, stateid);
1483                 INIT_LIST_HEAD(&stateid->ts_id_list);
1484                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1485
1486                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1487                 if (status)
1488                         goto out;
1489         }
1490
1491         status = 0;
1492 out:
1493         return status;
1494 xdr_error:
1495         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1496         status = nfserr_bad_xdr;
1497         goto out;
1498 }
1499
1500 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1501 {
1502         DECODE_HEAD;
1503
1504         READ_BUF(8);
1505         COPYMEM(&dc->clientid, 8);
1506
1507         DECODE_TAIL;
1508 }
1509
1510 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1511 {
1512         DECODE_HEAD;
1513
1514         READ_BUF(4);
1515         READ32(rc->rca_one_fs);
1516
1517         DECODE_TAIL;
1518 }
1519
1520 static __be32
1521 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1522 {
1523         return nfs_ok;
1524 }
1525
1526 static __be32
1527 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1528 {
1529         return nfserr_notsupp;
1530 }
1531
1532 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1533
1534 static nfsd4_dec nfsd4_dec_ops[] = {
1535         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1536         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1537         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1538         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1539         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1540         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1541         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1542         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1543         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1544         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1545         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1546         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1547         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1548         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1549         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1550         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1551         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1552         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1553         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1554         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1555         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1556         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1557         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1558         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1559         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1560         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1561         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1562         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1563         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1564         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1565         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1566         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1567         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1568         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1569         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1570         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1571         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1572
1573         /* new operations for NFSv4.1 */
1574         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1575         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1576         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1577         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1578         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1579         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1580         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1581         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1582         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1583         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1584         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1585         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1586         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1587         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1588         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1589         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1590         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1591         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1592         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1593 };
1594
1595 static inline bool
1596 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1597 {
1598         if (op->opnum < FIRST_NFS4_OP)
1599                 return false;
1600         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1601                 return false;
1602         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1603                 return false;
1604         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1605                 return false;
1606         return true;
1607 }
1608
1609 /*
1610  * Return a rough estimate of the maximum possible reply size.  Note the
1611  * estimate includes rpc headers so is meant to be passed to
1612  * svc_reserve, not svc_reserve_auth.
1613  *
1614  * Also note the current compound encoding permits only one operation to
1615  * use pages beyond the first one, so the maximum possible length is the
1616  * maximum over these values, not the sum.
1617  */
1618 static int nfsd4_max_reply(u32 opnum)
1619 {
1620         switch (opnum) {
1621         case OP_READLINK:
1622         case OP_READDIR:
1623                 /*
1624                  * Both of these ops take a single page for data and put
1625                  * the head and tail in another page:
1626                  */
1627                 return 2 * PAGE_SIZE;
1628         case OP_READ:
1629                 return INT_MAX;
1630         default:
1631                 return PAGE_SIZE;
1632         }
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 max_reply = PAGE_SIZE;
1642         int i;
1643
1644         READ_BUF(4);
1645         READ32(argp->taglen);
1646         READ_BUF(argp->taglen + 8);
1647         SAVEMEM(argp->tag, argp->taglen);
1648         READ32(argp->minorversion);
1649         READ32(argp->opcnt);
1650
1651         if (argp->taglen > NFSD4_MAX_TAGLEN)
1652                 goto xdr_error;
1653         if (argp->opcnt > 100)
1654                 goto xdr_error;
1655
1656         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1657                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1658                 if (!argp->ops) {
1659                         argp->ops = argp->iops;
1660                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1661                         goto xdr_error;
1662                 }
1663         }
1664
1665         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1666                 argp->opcnt = 0;
1667
1668         for (i = 0; i < argp->opcnt; i++) {
1669                 op = &argp->ops[i];
1670                 op->replay = NULL;
1671
1672                 READ_BUF(4);
1673                 READ32(op->opnum);
1674
1675                 if (nfsd4_opnum_in_range(argp, op))
1676                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1677                 else {
1678                         op->opnum = OP_ILLEGAL;
1679                         op->status = nfserr_op_illegal;
1680                 }
1681
1682                 if (op->status) {
1683                         argp->opcnt = i+1;
1684                         break;
1685                 }
1686                 /*
1687                  * We'll try to cache the result in the DRC if any one
1688                  * op in the compound wants to be cached:
1689                  */
1690                 cachethis |= nfsd4_cache_this_op(op);
1691
1692                 max_reply = max(max_reply, nfsd4_max_reply(op->opnum));
1693         }
1694         /* Sessions make the DRC unnecessary: */
1695         if (argp->minorversion)
1696                 cachethis = false;
1697         if (max_reply != INT_MAX)
1698                 svc_reserve(argp->rqstp, max_reply);
1699         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1700
1701         DECODE_TAIL;
1702 }
1703
1704 #define WRITE32(n)               *p++ = htonl(n)
1705 #define WRITE64(n)               do {                           \
1706         *p++ = htonl((u32)((n) >> 32));                         \
1707         *p++ = htonl((u32)(n));                                 \
1708 } while (0)
1709 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1710         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1711         memcpy(p, ptr, nbytes);                                 \
1712         p += XDR_QUADLEN(nbytes);                               \
1713 }} while (0)
1714
1715 static void write32(__be32 **p, u32 n)
1716 {
1717         *(*p)++ = htonl(n);
1718 }
1719
1720 static void write64(__be32 **p, u64 n)
1721 {
1722         write32(p, (n >> 32));
1723         write32(p, (u32)n);
1724 }
1725
1726 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1727 {
1728         if (IS_I_VERSION(inode)) {
1729                 write64(p, inode->i_version);
1730         } else {
1731                 write32(p, stat->ctime.tv_sec);
1732                 write32(p, stat->ctime.tv_nsec);
1733         }
1734 }
1735
1736 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1737 {
1738         write32(p, c->atomic);
1739         if (c->change_supported) {
1740                 write64(p, c->before_change);
1741                 write64(p, c->after_change);
1742         } else {
1743                 write32(p, c->before_ctime_sec);
1744                 write32(p, c->before_ctime_nsec);
1745                 write32(p, c->after_ctime_sec);
1746                 write32(p, c->after_ctime_nsec);
1747         }
1748 }
1749
1750 #define RESERVE_SPACE(nbytes)   do {                            \
1751         p = resp->p;                                            \
1752         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1753 } while (0)
1754 #define ADJUST_ARGS()           resp->p = p
1755
1756 /* Encode as an array of strings the string given with components
1757  * separated @sep, escaped with esc_enter and esc_exit.
1758  */
1759 static __be32 nfsd4_encode_components_esc(char sep, char *components,
1760                                    __be32 **pp, int *buflen,
1761                                    char esc_enter, char esc_exit)
1762 {
1763         __be32 *p = *pp;
1764         __be32 *countp = p;
1765         int strlen, count=0;
1766         char *str, *end, *next;
1767
1768         dprintk("nfsd4_encode_components(%s)\n", components);
1769         if ((*buflen -= 4) < 0)
1770                 return nfserr_resource;
1771         WRITE32(0); /* We will fill this in with @count later */
1772         end = str = components;
1773         while (*end) {
1774                 bool found_esc = false;
1775
1776                 /* try to parse as esc_start, ..., esc_end, sep */
1777                 if (*str == esc_enter) {
1778                         for (; *end && (*end != esc_exit); end++)
1779                                 /* find esc_exit or end of string */;
1780                         next = end + 1;
1781                         if (*end && (!*next || *next == sep)) {
1782                                 str++;
1783                                 found_esc = true;
1784                         }
1785                 }
1786
1787                 if (!found_esc)
1788                         for (; *end && (*end != sep); end++)
1789                                 /* find sep or end of string */;
1790
1791                 strlen = end - str;
1792                 if (strlen) {
1793                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1794                                 return nfserr_resource;
1795                         WRITE32(strlen);
1796                         WRITEMEM(str, strlen);
1797                         count++;
1798                 }
1799                 else
1800                         end++;
1801                 str = end;
1802         }
1803         *pp = p;
1804         p = countp;
1805         WRITE32(count);
1806         return 0;
1807 }
1808
1809 /* Encode as an array of strings the string given with components
1810  * separated @sep.
1811  */
1812 static __be32 nfsd4_encode_components(char sep, char *components,
1813                                    __be32 **pp, int *buflen)
1814 {
1815         return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
1816 }
1817
1818 /*
1819  * encode a location element of a fs_locations structure
1820  */
1821 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1822                                     __be32 **pp, int *buflen)
1823 {
1824         __be32 status;
1825         __be32 *p = *pp;
1826
1827         status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
1828                                                 '[', ']');
1829         if (status)
1830                 return status;
1831         status = nfsd4_encode_components('/', location->path, &p, buflen);
1832         if (status)
1833                 return status;
1834         *pp = p;
1835         return 0;
1836 }
1837
1838 /*
1839  * Encode a path in RFC3530 'pathname4' format
1840  */
1841 static __be32 nfsd4_encode_path(const struct path *root,
1842                 const struct path *path, __be32 **pp, int *buflen)
1843 {
1844         struct path cur = *path;
1845         __be32 *p = *pp;
1846         struct dentry **components = NULL;
1847         unsigned int ncomponents = 0;
1848         __be32 err = nfserr_jukebox;
1849
1850         dprintk("nfsd4_encode_components(");
1851
1852         path_get(&cur);
1853         /* First walk the path up to the nfsd root, and store the
1854          * dentries/path components in an array.
1855          */
1856         for (;;) {
1857                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1858                         break;
1859                 if (cur.dentry == cur.mnt->mnt_root) {
1860                         if (follow_up(&cur))
1861                                 continue;
1862                         goto out_free;
1863                 }
1864                 if ((ncomponents & 15) == 0) {
1865                         struct dentry **new;
1866                         new = krealloc(components,
1867                                         sizeof(*new) * (ncomponents + 16),
1868                                         GFP_KERNEL);
1869                         if (!new)
1870                                 goto out_free;
1871                         components = new;
1872                 }
1873                 components[ncomponents++] = cur.dentry;
1874                 cur.dentry = dget_parent(cur.dentry);
1875         }
1876
1877         *buflen -= 4;
1878         if (*buflen < 0)
1879                 goto out_free;
1880         WRITE32(ncomponents);
1881
1882         while (ncomponents) {
1883                 struct dentry *dentry = components[ncomponents - 1];
1884                 unsigned int len;
1885
1886                 spin_lock(&dentry->d_lock);
1887                 len = dentry->d_name.len;
1888                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1889                 if (*buflen < 0) {
1890                         spin_unlock(&dentry->d_lock);
1891                         goto out_free;
1892                 }
1893                 WRITE32(len);
1894                 WRITEMEM(dentry->d_name.name, len);
1895                 dprintk("/%s", dentry->d_name.name);
1896                 spin_unlock(&dentry->d_lock);
1897                 dput(dentry);
1898                 ncomponents--;
1899         }
1900
1901         *pp = p;
1902         err = 0;
1903 out_free:
1904         dprintk(")\n");
1905         while (ncomponents)
1906                 dput(components[--ncomponents]);
1907         kfree(components);
1908         path_put(&cur);
1909         return err;
1910 }
1911
1912 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1913                 const struct path *path, __be32 **pp, int *buflen)
1914 {
1915         struct svc_export *exp_ps;
1916         __be32 res;
1917
1918         exp_ps = rqst_find_fsidzero_export(rqstp);
1919         if (IS_ERR(exp_ps))
1920                 return nfserrno(PTR_ERR(exp_ps));
1921         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1922         exp_put(exp_ps);
1923         return res;
1924 }
1925
1926 /*
1927  *  encode a fs_locations structure
1928  */
1929 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1930                                      struct svc_export *exp,
1931                                      __be32 **pp, int *buflen)
1932 {
1933         __be32 status;
1934         int i;
1935         __be32 *p = *pp;
1936         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1937
1938         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1939         if (status)
1940                 return status;
1941         if ((*buflen -= 4) < 0)
1942                 return nfserr_resource;
1943         WRITE32(fslocs->locations_count);
1944         for (i=0; i<fslocs->locations_count; i++) {
1945                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1946                                                    &p, buflen);
1947                 if (status)
1948                         return status;
1949         }
1950         *pp = p;
1951         return 0;
1952 }
1953
1954 static u32 nfs4_file_type(umode_t mode)
1955 {
1956         switch (mode & S_IFMT) {
1957         case S_IFIFO:   return NF4FIFO;
1958         case S_IFCHR:   return NF4CHR;
1959         case S_IFDIR:   return NF4DIR;
1960         case S_IFBLK:   return NF4BLK;
1961         case S_IFLNK:   return NF4LNK;
1962         case S_IFREG:   return NF4REG;
1963         case S_IFSOCK:  return NF4SOCK;
1964         default:        return NF4BAD;
1965         };
1966 }
1967
1968 static __be32
1969 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, kuid_t uid, kgid_t gid,
1970                         __be32 **p, int *buflen)
1971 {
1972         int status;
1973
1974         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1975                 return nfserr_resource;
1976         if (whotype != NFS4_ACL_WHO_NAMED)
1977                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1978         else if (gid_valid(gid))
1979                 status = nfsd_map_gid_to_name(rqstp, gid, (u8 *)(*p + 1));
1980         else
1981                 status = nfsd_map_uid_to_name(rqstp, uid, (u8 *)(*p + 1));
1982         if (status < 0)
1983                 return nfserrno(status);
1984         *p = xdr_encode_opaque(*p, NULL, status);
1985         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1986         BUG_ON(*buflen < 0);
1987         return 0;
1988 }
1989
1990 static inline __be32
1991 nfsd4_encode_user(struct svc_rqst *rqstp, kuid_t user, __be32 **p, int *buflen)
1992 {
1993         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, user, INVALID_GID,
1994                                  p, buflen);
1995 }
1996
1997 static inline __be32
1998 nfsd4_encode_group(struct svc_rqst *rqstp, kgid_t group, __be32 **p, int *buflen)
1999 {
2000         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, INVALID_UID, group,
2001                                  p, buflen);
2002 }
2003
2004 static inline __be32
2005 nfsd4_encode_aclname(struct svc_rqst *rqstp, struct nfs4_ace *ace,
2006                 __be32 **p, int *buflen)
2007 {
2008         kuid_t uid = INVALID_UID;
2009         kgid_t gid = INVALID_GID;
2010
2011         if (ace->whotype == NFS4_ACL_WHO_NAMED) {
2012                 if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2013                         gid = ace->who_gid;
2014                 else
2015                         uid = ace->who_uid;
2016         }
2017         return nfsd4_encode_name(rqstp, ace->whotype, uid, gid, p, buflen);
2018 }
2019
2020 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2021                               FATTR4_WORD0_RDATTR_ERROR)
2022 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2023
2024 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2025 static inline __be32
2026 nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
2027 {
2028         __be32 *p = *pp;
2029
2030         if (*buflen < ((XDR_QUADLEN(len) << 2) + 4 + 4 + 4))
2031                 return nfserr_resource;
2032
2033         /*
2034          * For now we use a 0 here to indicate the null translation; in
2035          * the future we may place a call to translation code here.
2036          */
2037         if ((*buflen -= 8) < 0)
2038                 return nfserr_resource;
2039
2040         WRITE32(0); /* lfs */
2041         WRITE32(0); /* pi */
2042         p = xdr_encode_opaque(p, context, len);
2043         *buflen -= (XDR_QUADLEN(len) << 2) + 4;
2044
2045         *pp = p;
2046         return 0;
2047 }
2048 #else
2049 static inline __be32
2050 nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
2051 { return 0; }
2052 #endif
2053
2054 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2055 {
2056         /* As per referral draft:  */
2057         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2058             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2059                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2060                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2061                         *rdattr_err = NFSERR_MOVED;
2062                 else
2063                         return nfserr_moved;
2064         }
2065         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2066         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2067         return 0;
2068 }
2069
2070
2071 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2072 {
2073         struct path path = exp->ex_path;
2074         int err;
2075
2076         path_get(&path);
2077         while (follow_up(&path)) {
2078                 if (path.dentry != path.mnt->mnt_root)
2079                         break;
2080         }
2081         err = vfs_getattr(&path, stat);
2082         path_put(&path);
2083         return err;
2084 }
2085
2086 /*
2087  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2088  * ourselves.
2089  *
2090  * countp is the buffer size in _words_
2091  */
2092 __be32
2093 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2094                 struct dentry *dentry, __be32 **buffer, int count, u32 *bmval,
2095                 struct svc_rqst *rqstp, int ignore_crossmnt)
2096 {
2097         u32 bmval0 = bmval[0];
2098         u32 bmval1 = bmval[1];
2099         u32 bmval2 = bmval[2];
2100         struct kstat stat;
2101         struct svc_fh tempfh;
2102         struct kstatfs statfs;
2103         int buflen = count << 2;
2104         __be32 *attrlenp;
2105         u32 dummy;
2106         u64 dummy64;
2107         u32 rdattr_err = 0;
2108         __be32 *p = *buffer;
2109         __be32 status;
2110         int err;
2111         int aclsupport = 0;
2112         struct nfs4_acl *acl = NULL;
2113         void *context = NULL;
2114         int contextlen;
2115         bool contextsupport = false;
2116         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2117         u32 minorversion = resp->cstate.minorversion;
2118         struct path path = {
2119                 .mnt    = exp->ex_path.mnt,
2120                 .dentry = dentry,
2121         };
2122         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2123
2124         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2125         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2126         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2127         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2128
2129         if (exp->ex_fslocs.migrated) {
2130                 BUG_ON(bmval[2]);
2131                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2132                 if (status)
2133                         goto out;
2134         }
2135
2136         err = vfs_getattr(&path, &stat);
2137         if (err)
2138                 goto out_nfserr;
2139         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2140                         FATTR4_WORD0_MAXNAME)) ||
2141             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2142                        FATTR4_WORD1_SPACE_TOTAL))) {
2143                 err = vfs_statfs(&path, &statfs);
2144                 if (err)
2145                         goto out_nfserr;
2146         }
2147         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2148                 fh_init(&tempfh, NFS4_FHSIZE);
2149                 status = fh_compose(&tempfh, exp, dentry, NULL);
2150                 if (status)
2151                         goto out;
2152                 fhp = &tempfh;
2153         }
2154         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2155                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2156                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2157                 aclsupport = (err == 0);
2158                 if (bmval0 & FATTR4_WORD0_ACL) {
2159                         if (err == -EOPNOTSUPP)
2160                                 bmval0 &= ~FATTR4_WORD0_ACL;
2161                         else if (err == -EINVAL) {
2162                                 status = nfserr_attrnotsupp;
2163                                 goto out;
2164                         } else if (err != 0)
2165                                 goto out_nfserr;
2166                 }
2167         }
2168
2169 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2170         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2171                         bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2172                 err = security_inode_getsecctx(dentry->d_inode,
2173                                                 &context, &contextlen);
2174                 contextsupport = (err == 0);
2175                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2176                         if (err == -EOPNOTSUPP)
2177                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2178                         else if (err)
2179                                 goto out_nfserr;
2180                 }
2181         }
2182 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2183
2184         if (bmval2) {
2185                 if ((buflen -= 16) < 0)
2186                         goto out_resource;
2187                 WRITE32(3);
2188                 WRITE32(bmval0);
2189                 WRITE32(bmval1);
2190                 WRITE32(bmval2);
2191         } else if (bmval1) {
2192                 if ((buflen -= 12) < 0)
2193                         goto out_resource;
2194                 WRITE32(2);
2195                 WRITE32(bmval0);
2196                 WRITE32(bmval1);
2197         } else {
2198                 if ((buflen -= 8) < 0)
2199                         goto out_resource;
2200                 WRITE32(1);
2201                 WRITE32(bmval0);
2202         }
2203         attrlenp = p++;                /* to be backfilled later */
2204
2205         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2206                 u32 word0 = nfsd_suppattrs0(minorversion);
2207                 u32 word1 = nfsd_suppattrs1(minorversion);
2208                 u32 word2 = nfsd_suppattrs2(minorversion);
2209
2210                 if (!aclsupport)
2211                         word0 &= ~FATTR4_WORD0_ACL;
2212                 if (!contextsupport)
2213                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2214                 if (!word2) {
2215                         if ((buflen -= 12) < 0)
2216                                 goto out_resource;
2217                         WRITE32(2);
2218                         WRITE32(word0);
2219                         WRITE32(word1);
2220                 } else {
2221                         if ((buflen -= 16) < 0)
2222                                 goto out_resource;
2223                         WRITE32(3);
2224                         WRITE32(word0);
2225                         WRITE32(word1);
2226                         WRITE32(word2);
2227                 }
2228         }
2229         if (bmval0 & FATTR4_WORD0_TYPE) {
2230                 if ((buflen -= 4) < 0)
2231                         goto out_resource;
2232                 dummy = nfs4_file_type(stat.mode);
2233                 if (dummy == NF4BAD)
2234                         goto out_serverfault;
2235                 WRITE32(dummy);
2236         }
2237         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2238                 if ((buflen -= 4) < 0)
2239                         goto out_resource;
2240                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2241                         WRITE32(NFS4_FH_PERSISTENT);
2242                 else
2243                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2244         }
2245         if (bmval0 & FATTR4_WORD0_CHANGE) {
2246                 if ((buflen -= 8) < 0)
2247                         goto out_resource;
2248                 write_change(&p, &stat, dentry->d_inode);
2249         }
2250         if (bmval0 & FATTR4_WORD0_SIZE) {
2251                 if ((buflen -= 8) < 0)
2252                         goto out_resource;
2253                 WRITE64(stat.size);
2254         }
2255         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2256                 if ((buflen -= 4) < 0)
2257                         goto out_resource;
2258                 WRITE32(1);
2259         }
2260         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2261                 if ((buflen -= 4) < 0)
2262                         goto out_resource;
2263                 WRITE32(1);
2264         }
2265         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2266                 if ((buflen -= 4) < 0)
2267                         goto out_resource;
2268                 WRITE32(0);
2269         }
2270         if (bmval0 & FATTR4_WORD0_FSID) {
2271                 if ((buflen -= 16) < 0)
2272                         goto out_resource;
2273                 if (exp->ex_fslocs.migrated) {
2274                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2275                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2276                 } else switch(fsid_source(fhp)) {
2277                 case FSIDSOURCE_FSID:
2278                         WRITE64((u64)exp->ex_fsid);
2279                         WRITE64((u64)0);
2280                         break;
2281                 case FSIDSOURCE_DEV:
2282                         WRITE32(0);
2283                         WRITE32(MAJOR(stat.dev));
2284                         WRITE32(0);
2285                         WRITE32(MINOR(stat.dev));
2286                         break;
2287                 case FSIDSOURCE_UUID:
2288                         WRITEMEM(exp->ex_uuid, 16);
2289                         break;
2290                 }
2291         }
2292         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2293                 if ((buflen -= 4) < 0)
2294                         goto out_resource;
2295                 WRITE32(0);
2296         }
2297         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2298                 if ((buflen -= 4) < 0)
2299                         goto out_resource;
2300                 WRITE32(nn->nfsd4_lease);
2301         }
2302         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2303                 if ((buflen -= 4) < 0)
2304                         goto out_resource;
2305                 WRITE32(rdattr_err);
2306         }
2307         if (bmval0 & FATTR4_WORD0_ACL) {
2308                 struct nfs4_ace *ace;
2309
2310                 if (acl == NULL) {
2311                         if ((buflen -= 4) < 0)
2312                                 goto out_resource;
2313
2314                         WRITE32(0);
2315                         goto out_acl;
2316                 }
2317                 if ((buflen -= 4) < 0)
2318                         goto out_resource;
2319                 WRITE32(acl->naces);
2320
2321                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2322                         if ((buflen -= 4*3) < 0)
2323                                 goto out_resource;
2324                         WRITE32(ace->type);
2325                         WRITE32(ace->flag);
2326                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2327                         status = nfsd4_encode_aclname(rqstp, ace, &p, &buflen);
2328                         if (status == nfserr_resource)
2329                                 goto out_resource;
2330                         if (status)
2331                                 goto out;
2332                 }
2333         }
2334 out_acl:
2335         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2336                 if ((buflen -= 4) < 0)
2337                         goto out_resource;
2338                 WRITE32(aclsupport ?
2339                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2340         }
2341         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2342                 if ((buflen -= 4) < 0)
2343                         goto out_resource;
2344                 WRITE32(1);
2345         }
2346         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2347                 if ((buflen -= 4) < 0)
2348                         goto out_resource;
2349                 WRITE32(0);
2350         }
2351         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2352                 if ((buflen -= 4) < 0)
2353                         goto out_resource;
2354                 WRITE32(1);
2355         }
2356         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2357                 if ((buflen -= 4) < 0)
2358                         goto out_resource;
2359                 WRITE32(1);
2360         }
2361         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2362                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2363                 if (buflen < 0)
2364                         goto out_resource;
2365                 WRITE32(fhp->fh_handle.fh_size);
2366                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2367         }
2368         if (bmval0 & FATTR4_WORD0_FILEID) {
2369                 if ((buflen -= 8) < 0)
2370                         goto out_resource;
2371                 WRITE64(stat.ino);
2372         }
2373         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2374                 if ((buflen -= 8) < 0)
2375                         goto out_resource;
2376                 WRITE64((u64) statfs.f_ffree);
2377         }
2378         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2379                 if ((buflen -= 8) < 0)
2380                         goto out_resource;
2381                 WRITE64((u64) statfs.f_ffree);
2382         }
2383         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2384                 if ((buflen -= 8) < 0)
2385                         goto out_resource;
2386                 WRITE64((u64) statfs.f_files);
2387         }
2388         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2389                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2390                 if (status == nfserr_resource)
2391                         goto out_resource;
2392                 if (status)
2393                         goto out;
2394         }
2395         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2396                 if ((buflen -= 4) < 0)
2397                         goto out_resource;
2398                 WRITE32(1);
2399         }
2400         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2401                 if ((buflen -= 8) < 0)
2402                         goto out_resource;
2403                 WRITE64(exp->ex_path.mnt->mnt_sb->s_maxbytes);
2404         }
2405         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2406                 if ((buflen -= 4) < 0)
2407                         goto out_resource;
2408                 WRITE32(255);
2409         }
2410         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2411                 if ((buflen -= 4) < 0)
2412                         goto out_resource;
2413                 WRITE32(statfs.f_namelen);
2414         }
2415         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2416                 if ((buflen -= 8) < 0)
2417                         goto out_resource;
2418                 WRITE64((u64) svc_max_payload(rqstp));
2419         }
2420         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2421                 if ((buflen -= 8) < 0)
2422                         goto out_resource;
2423                 WRITE64((u64) svc_max_payload(rqstp));
2424         }
2425         if (bmval1 & FATTR4_WORD1_MODE) {
2426                 if ((buflen -= 4) < 0)
2427                         goto out_resource;
2428                 WRITE32(stat.mode & S_IALLUGO);
2429         }
2430         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2431                 if ((buflen -= 4) < 0)
2432                         goto out_resource;
2433                 WRITE32(1);
2434         }
2435         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2436                 if ((buflen -= 4) < 0)
2437                         goto out_resource;
2438                 WRITE32(stat.nlink);
2439         }
2440         if (bmval1 & FATTR4_WORD1_OWNER) {
2441                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2442                 if (status == nfserr_resource)
2443                         goto out_resource;
2444                 if (status)
2445                         goto out;
2446         }
2447         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2448                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2449                 if (status == nfserr_resource)
2450                         goto out_resource;
2451                 if (status)
2452                         goto out;
2453         }
2454         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2455                 if ((buflen -= 8) < 0)
2456                         goto out_resource;
2457                 WRITE32((u32) MAJOR(stat.rdev));
2458                 WRITE32((u32) MINOR(stat.rdev));
2459         }
2460         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2461                 if ((buflen -= 8) < 0)
2462                         goto out_resource;
2463                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2464                 WRITE64(dummy64);
2465         }
2466         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2467                 if ((buflen -= 8) < 0)
2468                         goto out_resource;
2469                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2470                 WRITE64(dummy64);
2471         }
2472         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2473                 if ((buflen -= 8) < 0)
2474                         goto out_resource;
2475                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2476                 WRITE64(dummy64);
2477         }
2478         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2479                 if ((buflen -= 8) < 0)
2480                         goto out_resource;
2481                 dummy64 = (u64)stat.blocks << 9;
2482                 WRITE64(dummy64);
2483         }
2484         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2485                 if ((buflen -= 12) < 0)
2486                         goto out_resource;
2487                 WRITE64((s64)stat.atime.tv_sec);
2488                 WRITE32(stat.atime.tv_nsec);
2489         }
2490         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2491                 if ((buflen -= 12) < 0)
2492                         goto out_resource;
2493                 WRITE32(0);
2494                 WRITE32(1);
2495                 WRITE32(0);
2496         }
2497         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2498                 if ((buflen -= 12) < 0)
2499                         goto out_resource;
2500                 WRITE64((s64)stat.ctime.tv_sec);
2501                 WRITE32(stat.ctime.tv_nsec);
2502         }
2503         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2504                 if ((buflen -= 12) < 0)
2505                         goto out_resource;
2506                 WRITE64((s64)stat.mtime.tv_sec);
2507                 WRITE32(stat.mtime.tv_nsec);
2508         }
2509         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2510                 if ((buflen -= 8) < 0)
2511                         goto out_resource;
2512                 /*
2513                  * Get parent's attributes if not ignoring crossmount
2514                  * and this is the root of a cross-mounted filesystem.
2515                  */
2516                 if (ignore_crossmnt == 0 &&
2517                     dentry == exp->ex_path.mnt->mnt_root)
2518                         get_parent_attributes(exp, &stat);
2519                 WRITE64(stat.ino);
2520         }
2521         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2522                 status = nfsd4_encode_security_label(rqstp, context,
2523                                 contextlen, &p, &buflen);
2524                 if (status)
2525                         goto out;
2526         }
2527         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2528                 WRITE32(3);
2529                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2530                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2531                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2532         }
2533
2534         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2535         *buffer = p;
2536         status = nfs_ok;
2537
2538 out:
2539 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2540         if (context)
2541                 security_release_secctx(context, contextlen);
2542 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2543         kfree(acl);
2544         if (fhp == &tempfh)
2545                 fh_put(&tempfh);
2546         return status;
2547 out_nfserr:
2548         status = nfserrno(err);
2549         goto out;
2550 out_resource:
2551         status = nfserr_resource;
2552         goto out;
2553 out_serverfault:
2554         status = nfserr_serverfault;
2555         goto out;
2556 }
2557
2558 static inline int attributes_need_mount(u32 *bmval)
2559 {
2560         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2561                 return 1;
2562         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2563                 return 1;
2564         return 0;
2565 }
2566
2567 static __be32
2568 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2569                 const char *name, int namlen, __be32 **p, int buflen)
2570 {
2571         struct svc_export *exp = cd->rd_fhp->fh_export;
2572         struct dentry *dentry;
2573         __be32 nfserr;
2574         int ignore_crossmnt = 0;
2575
2576         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2577         if (IS_ERR(dentry))
2578                 return nfserrno(PTR_ERR(dentry));
2579         if (!dentry->d_inode) {
2580                 /*
2581                  * nfsd_buffered_readdir drops the i_mutex between
2582                  * readdir and calling this callback, leaving a window
2583                  * where this directory entry could have gone away.
2584                  */
2585                 dput(dentry);
2586                 return nfserr_noent;
2587         }
2588
2589         exp_get(exp);
2590         /*
2591          * In the case of a mountpoint, the client may be asking for
2592          * attributes that are only properties of the underlying filesystem
2593          * as opposed to the cross-mounted file system. In such a case,
2594          * we will not follow the cross mount and will fill the attribtutes
2595          * directly from the mountpoint dentry.
2596          */
2597         if (nfsd_mountpoint(dentry, exp)) {
2598                 int err;
2599
2600                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2601                                 && !attributes_need_mount(cd->rd_bmval)) {
2602                         ignore_crossmnt = 1;
2603                         goto out_encode;
2604                 }
2605                 /*
2606                  * Why the heck aren't we just using nfsd_lookup??
2607                  * Different "."/".." handling?  Something else?
2608                  * At least, add a comment here to explain....
2609                  */
2610                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2611                 if (err) {
2612                         nfserr = nfserrno(err);
2613                         goto out_put;
2614                 }
2615                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2616                 if (nfserr)
2617                         goto out_put;
2618
2619         }
2620 out_encode:
2621         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2622                                         cd->rd_rqstp, ignore_crossmnt);
2623 out_put:
2624         dput(dentry);
2625         exp_put(exp);
2626         return nfserr;
2627 }
2628
2629 static __be32 *
2630 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2631 {
2632         __be32 *attrlenp;
2633
2634         if (buflen < 6)
2635                 return NULL;
2636         *p++ = htonl(2);
2637         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2638         *p++ = htonl(0);                         /* bmval1 */
2639
2640         attrlenp = p++;
2641         *p++ = nfserr;       /* no htonl */
2642         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2643         return p;
2644 }
2645
2646 static int
2647 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2648                     loff_t offset, u64 ino, unsigned int d_type)
2649 {
2650         struct readdir_cd *ccd = ccdv;
2651         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2652         int buflen;
2653         __be32 *p = cd->buffer;
2654         __be32 *cookiep;
2655         __be32 nfserr = nfserr_toosmall;
2656
2657         /* In nfsv4, "." and ".." never make it onto the wire.. */
2658         if (name && isdotent(name, namlen)) {
2659                 cd->common.err = nfs_ok;
2660                 return 0;
2661         }
2662
2663         if (cd->offset)
2664                 xdr_encode_hyper(cd->offset, (u64) offset);
2665
2666         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2667         if (buflen < 0)
2668                 goto fail;
2669
2670         *p++ = xdr_one;                             /* mark entry present */
2671         cookiep = p;
2672         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2673         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2674
2675         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, &p, buflen);
2676         switch (nfserr) {
2677         case nfs_ok:
2678                 break;
2679         case nfserr_resource:
2680                 nfserr = nfserr_toosmall;
2681                 goto fail;
2682         case nfserr_noent:
2683                 goto skip_entry;
2684         default:
2685                 /*
2686                  * If the client requested the RDATTR_ERROR attribute,
2687                  * we stuff the error code into this attribute
2688                  * and continue.  If this attribute was not requested,
2689                  * then in accordance with the spec, we fail the
2690                  * entire READDIR operation(!)
2691                  */
2692                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2693                         goto fail;
2694                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2695                 if (p == NULL) {
2696                         nfserr = nfserr_toosmall;
2697                         goto fail;
2698                 }
2699         }
2700         cd->buflen -= (p - cd->buffer);
2701         cd->buffer = p;
2702         cd->offset = cookiep;
2703 skip_entry:
2704         cd->common.err = nfs_ok;
2705         return 0;
2706 fail:
2707         cd->common.err = nfserr;
2708         return -EINVAL;
2709 }
2710
2711 static void
2712 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2713 {
2714         __be32 *p;
2715
2716         RESERVE_SPACE(sizeof(stateid_t));
2717         WRITE32(sid->si_generation);
2718         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2719         ADJUST_ARGS();
2720 }
2721
2722 static __be32
2723 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2724 {
2725         __be32 *p;
2726
2727         if (!nfserr) {
2728                 RESERVE_SPACE(8);
2729                 WRITE32(access->ac_supported);
2730                 WRITE32(access->ac_resp_access);
2731                 ADJUST_ARGS();
2732         }
2733         return nfserr;
2734 }
2735
2736 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2737 {
2738         __be32 *p;
2739
2740         if (!nfserr) {
2741                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2742                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2743                 WRITE32(bcts->dir);
2744                 /* Sorry, we do not yet support RDMA over 4.1: */
2745                 WRITE32(0);
2746                 ADJUST_ARGS();
2747         }
2748         return nfserr;
2749 }
2750
2751 static __be32
2752 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2753 {
2754         if (!nfserr)
2755                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2756
2757         return nfserr;
2758 }
2759
2760
2761 static __be32
2762 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2763 {
2764         __be32 *p;
2765
2766         if (!nfserr) {
2767                 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2768                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2769                 ADJUST_ARGS();
2770         }
2771         return nfserr;
2772 }
2773
2774 static __be32
2775 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2776 {
2777         __be32 *p;
2778
2779         if (!nfserr) {
2780                 RESERVE_SPACE(32);
2781                 write_cinfo(&p, &create->cr_cinfo);
2782                 WRITE32(2);
2783                 WRITE32(create->cr_bmval[0]);
2784                 WRITE32(create->cr_bmval[1]);
2785                 ADJUST_ARGS();
2786         }
2787         return nfserr;
2788 }
2789
2790 static __be32
2791 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2792 {
2793         struct svc_fh *fhp = getattr->ga_fhp;
2794         int buflen;
2795
2796         if (nfserr)
2797                 return nfserr;
2798
2799         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2800         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2801                                     &resp->p, buflen, getattr->ga_bmval,
2802                                     resp->rqstp, 0);
2803         return nfserr;
2804 }
2805
2806 static __be32
2807 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2808 {
2809         struct svc_fh *fhp = *fhpp;
2810         unsigned int len;
2811         __be32 *p;
2812
2813         if (!nfserr) {
2814                 len = fhp->fh_handle.fh_size;
2815                 RESERVE_SPACE(len + 4);
2816                 WRITE32(len);
2817                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2818                 ADJUST_ARGS();
2819         }
2820         return nfserr;
2821 }
2822
2823 /*
2824 * Including all fields other than the name, a LOCK4denied structure requires
2825 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2826 */
2827 static void
2828 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2829 {
2830         struct xdr_netobj *conf = &ld->ld_owner;
2831         __be32 *p;
2832
2833         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2834         WRITE64(ld->ld_start);
2835         WRITE64(ld->ld_length);
2836         WRITE32(ld->ld_type);
2837         if (conf->len) {
2838                 WRITEMEM(&ld->ld_clientid, 8);
2839                 WRITE32(conf->len);
2840                 WRITEMEM(conf->data, conf->len);
2841                 kfree(conf->data);
2842         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2843                 WRITE64((u64)0); /* clientid */
2844                 WRITE32(0); /* length of owner name */
2845         }
2846         ADJUST_ARGS();
2847 }
2848
2849 static __be32
2850 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2851 {
2852         if (!nfserr)
2853                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2854         else if (nfserr == nfserr_denied)
2855                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2856
2857         return nfserr;
2858 }
2859
2860 static __be32
2861 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2862 {
2863         if (nfserr == nfserr_denied)
2864                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2865         return nfserr;
2866 }
2867
2868 static __be32
2869 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2870 {
2871         if (!nfserr)
2872                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2873
2874         return nfserr;
2875 }
2876
2877
2878 static __be32
2879 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2880 {
2881         __be32 *p;
2882
2883         if (!nfserr) {
2884                 RESERVE_SPACE(20);
2885                 write_cinfo(&p, &link->li_cinfo);
2886                 ADJUST_ARGS();
2887         }
2888         return nfserr;
2889 }
2890
2891
2892 static __be32
2893 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2894 {
2895         __be32 *p;
2896
2897         if (nfserr)
2898                 goto out;
2899
2900         nfsd4_encode_stateid(resp, &open->op_stateid);
2901         RESERVE_SPACE(40);
2902         write_cinfo(&p, &open->op_cinfo);
2903         WRITE32(open->op_rflags);
2904         WRITE32(2);
2905         WRITE32(open->op_bmval[0]);
2906         WRITE32(open->op_bmval[1]);
2907         WRITE32(open->op_delegate_type);
2908         ADJUST_ARGS();
2909
2910         switch (open->op_delegate_type) {
2911         case NFS4_OPEN_DELEGATE_NONE:
2912                 break;
2913         case NFS4_OPEN_DELEGATE_READ:
2914                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2915                 RESERVE_SPACE(20);
2916                 WRITE32(open->op_recall);
2917
2918                 /*
2919                  * TODO: ACE's in delegations
2920                  */
2921                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2922                 WRITE32(0);
2923                 WRITE32(0);
2924                 WRITE32(0);   /* XXX: is NULL principal ok? */
2925                 ADJUST_ARGS();
2926                 break;
2927         case NFS4_OPEN_DELEGATE_WRITE:
2928                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2929                 RESERVE_SPACE(32);
2930                 WRITE32(0);
2931
2932                 /*
2933                  * TODO: space_limit's in delegations
2934                  */
2935                 WRITE32(NFS4_LIMIT_SIZE);
2936                 WRITE32(~(u32)0);
2937                 WRITE32(~(u32)0);
2938
2939                 /*
2940                  * TODO: ACE's in delegations
2941                  */
2942                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2943                 WRITE32(0);
2944                 WRITE32(0);
2945                 WRITE32(0);   /* XXX: is NULL principal ok? */
2946                 ADJUST_ARGS();
2947                 break;
2948         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2949                 switch (open->op_why_no_deleg) {
2950                 case WND4_CONTENTION:
2951                 case WND4_RESOURCE:
2952                         RESERVE_SPACE(8);
2953                         WRITE32(open->op_why_no_deleg);
2954                         WRITE32(0);     /* deleg signaling not supported yet */
2955                         break;
2956                 default:
2957                         RESERVE_SPACE(4);
2958                         WRITE32(open->op_why_no_deleg);
2959                 }
2960                 ADJUST_ARGS();
2961                 break;
2962         default:
2963                 BUG();
2964         }
2965         /* XXX save filehandle here */
2966 out:
2967         return nfserr;
2968 }
2969
2970 static __be32
2971 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2972 {
2973         if (!nfserr)
2974                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2975
2976         return nfserr;
2977 }
2978
2979 static __be32
2980 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2981 {
2982         if (!nfserr)
2983                 nfsd4_encode_stateid(resp, &od->od_stateid);
2984
2985         return nfserr;
2986 }
2987
2988 static __be32
2989 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2990                   struct nfsd4_read *read)
2991 {
2992         u32 eof;
2993         int v;
2994         struct page *page;
2995         unsigned long maxcount;
2996         long len;
2997         __be32 *p;
2998
2999         if (nfserr)
3000                 return nfserr;
3001         if (resp->xbuf->page_len)
3002                 return nfserr_resource;
3003
3004         RESERVE_SPACE(8); /* eof flag and byte count */
3005
3006         maxcount = svc_max_payload(resp->rqstp);
3007         if (maxcount > read->rd_length)
3008                 maxcount = read->rd_length;
3009
3010         len = maxcount;
3011         v = 0;
3012         while (len > 0) {
3013                 page = *(resp->rqstp->rq_next_page);
3014                 if (!page) { /* ran out of pages */
3015                         maxcount -= len;
3016                         break;
3017                 }
3018                 resp->rqstp->rq_vec[v].iov_base = page_address(page);
3019                 resp->rqstp->rq_vec[v].iov_len =
3020                         len < PAGE_SIZE ? len : PAGE_SIZE;
3021                 resp->rqstp->rq_next_page++;
3022                 v++;
3023                 len -= PAGE_SIZE;
3024         }
3025         read->rd_vlen = v;
3026
3027         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
3028                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
3029                         &maxcount);
3030
3031         if (nfserr)
3032                 return nfserr;
3033         eof = (read->rd_offset + maxcount >=
3034                read->rd_fhp->fh_dentry->d_inode->i_size);
3035
3036         WRITE32(eof);
3037         WRITE32(maxcount);
3038         ADJUST_ARGS();
3039         resp->xbuf->head[0].iov_len = (char*)p
3040                                         - (char*)resp->xbuf->head[0].iov_base;
3041         resp->xbuf->page_len = maxcount;
3042
3043         /* Use rest of head for padding and remaining ops: */
3044         resp->xbuf->tail[0].iov_base = p;
3045         resp->xbuf->tail[0].iov_len = 0;
3046         if (maxcount&3) {
3047                 RESERVE_SPACE(4);
3048                 WRITE32(0);
3049                 resp->xbuf->tail[0].iov_base += maxcount&3;
3050                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3051                 ADJUST_ARGS();
3052         }
3053         return 0;
3054 }
3055
3056 static __be32
3057 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3058 {
3059         int maxcount;
3060         char *page;
3061         __be32 *p;
3062
3063         if (nfserr)
3064                 return nfserr;
3065         if (resp->xbuf->page_len)
3066                 return nfserr_resource;
3067         if (!*resp->rqstp->rq_next_page)
3068                 return nfserr_resource;
3069
3070         page = page_address(*(resp->rqstp->rq_next_page++));
3071
3072         maxcount = PAGE_SIZE;
3073         RESERVE_SPACE(4);
3074
3075         /*
3076          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3077          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3078          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3079          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3080          */
3081         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
3082         if (nfserr == nfserr_isdir)
3083                 return nfserr_inval;
3084         if (nfserr)
3085                 return nfserr;
3086
3087         WRITE32(maxcount);
3088         ADJUST_ARGS();
3089         resp->xbuf->head[0].iov_len = (char*)p
3090                                 - (char*)resp->xbuf->head[0].iov_base;
3091         resp->xbuf->page_len = maxcount;
3092
3093         /* Use rest of head for padding and remaining ops: */
3094         resp->xbuf->tail[0].iov_base = p;
3095         resp->xbuf->tail[0].iov_len = 0;
3096         if (maxcount&3) {
3097                 RESERVE_SPACE(4);
3098                 WRITE32(0);
3099                 resp->xbuf->tail[0].iov_base += maxcount&3;
3100                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3101                 ADJUST_ARGS();
3102         }
3103         return 0;
3104 }
3105
3106 static __be32
3107 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3108 {
3109         int maxcount;
3110         loff_t offset;
3111         __be32 *page, *savep, *tailbase;
3112         __be32 *p;
3113
3114         if (nfserr)
3115                 return nfserr;
3116         if (resp->xbuf->page_len)
3117                 return nfserr_resource;
3118         if (!*resp->rqstp->rq_next_page)
3119                 return nfserr_resource;
3120
3121         RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3122         savep = p;
3123
3124         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3125         WRITE32(0);
3126         WRITE32(0);
3127         ADJUST_ARGS();
3128         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3129         tailbase = p;
3130
3131         maxcount = PAGE_SIZE;
3132         if (maxcount > readdir->rd_maxcount)
3133                 maxcount = readdir->rd_maxcount;
3134
3135         /*
3136          * Convert from bytes to words, account for the two words already
3137          * written, make sure to leave two words at the end for the next
3138          * pointer and eof field.
3139          */
3140         maxcount = (maxcount >> 2) - 4;
3141         if (maxcount < 0) {
3142                 nfserr =  nfserr_toosmall;
3143                 goto err_no_verf;
3144         }
3145
3146         page = page_address(*(resp->rqstp->rq_next_page++));
3147         readdir->common.err = 0;
3148         readdir->buflen = maxcount;
3149         readdir->buffer = page;
3150         readdir->offset = NULL;
3151
3152         offset = readdir->rd_cookie;
3153         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3154                               &offset,
3155                               &readdir->common, nfsd4_encode_dirent);
3156         if (nfserr == nfs_ok &&
3157             readdir->common.err == nfserr_toosmall &&
3158             readdir->buffer == page)
3159                 nfserr = nfserr_toosmall;
3160         if (nfserr)
3161                 goto err_no_verf;
3162
3163         if (readdir->offset)
3164                 xdr_encode_hyper(readdir->offset, offset);
3165
3166         p = readdir->buffer;
3167         *p++ = 0;       /* no more entries */
3168         *p++ = htonl(readdir->common.err == nfserr_eof);
3169         resp->xbuf->page_len = ((char*)p) -
3170                 (char*)page_address(*(resp->rqstp->rq_next_page-1));
3171
3172         /* Use rest of head for padding and remaining ops: */
3173         resp->xbuf->tail[0].iov_base = tailbase;
3174         resp->xbuf->tail[0].iov_len = 0;
3175         resp->p = resp->xbuf->tail[0].iov_base;
3176         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3177
3178         return 0;
3179 err_no_verf:
3180         p = savep;
3181         ADJUST_ARGS();
3182         return nfserr;
3183 }
3184
3185 static __be32
3186 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3187 {
3188         __be32 *p;
3189
3190         if (!nfserr) {
3191                 RESERVE_SPACE(20);
3192                 write_cinfo(&p, &remove->rm_cinfo);
3193                 ADJUST_ARGS();
3194         }
3195         return nfserr;
3196 }
3197
3198 static __be32
3199 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3200 {
3201         __be32 *p;
3202
3203         if (!nfserr) {
3204                 RESERVE_SPACE(40);
3205                 write_cinfo(&p, &rename->rn_sinfo);
3206                 write_cinfo(&p, &rename->rn_tinfo);
3207                 ADJUST_ARGS();
3208         }
3209         return nfserr;
3210 }
3211
3212 static __be32
3213 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3214                          __be32 nfserr, struct svc_export *exp)
3215 {
3216         u32 i, nflavs, supported;
3217         struct exp_flavor_info *flavs;
3218         struct exp_flavor_info def_flavs[2];
3219         __be32 *p, *flavorsp;
3220         static bool report = true;
3221
3222         if (nfserr)
3223                 goto out;
3224         if (exp->ex_nflavors) {
3225                 flavs = exp->ex_flavors;
3226                 nflavs = exp->ex_nflavors;
3227         } else { /* Handling of some defaults in absence of real secinfo: */
3228                 flavs = def_flavs;
3229                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3230                         nflavs = 2;
3231                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3232                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3233                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3234                         nflavs = 1;
3235                         flavs[0].pseudoflavor
3236                                         = svcauth_gss_flavor(exp->ex_client);
3237                 } else {
3238                         nflavs = 1;
3239                         flavs[0].pseudoflavor
3240                                         = exp->ex_client->flavour->flavour;
3241                 }
3242         }
3243
3244         supported = 0;
3245         RESERVE_SPACE(4);
3246         flavorsp = p++;         /* to be backfilled later */
3247         ADJUST_ARGS();
3248
3249         for (i = 0; i < nflavs; i++) {
3250                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3251                 struct rpcsec_gss_info info;
3252
3253                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3254                         supported++;
3255                         RESERVE_SPACE(4 + 4 + XDR_LEN(info.oid.len) + 4 + 4);
3256                         WRITE32(RPC_AUTH_GSS);
3257                         WRITE32(info.oid.len);
3258                         WRITEMEM(info.oid.data, info.oid.len);
3259                         WRITE32(info.qop);
3260                         WRITE32(info.service);
3261                         ADJUST_ARGS();
3262                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3263                         supported++;
3264                         RESERVE_SPACE(4);
3265                         WRITE32(pf);
3266                         ADJUST_ARGS();
3267                 } else {
3268                         if (report)
3269                                 pr_warn("NFS: SECINFO: security flavor %u "
3270                                         "is not supported\n", pf);
3271                 }
3272         }
3273
3274         if (nflavs != supported)
3275                 report = false;
3276         *flavorsp = htonl(supported);
3277
3278 out:
3279         if (exp)
3280                 exp_put(exp);
3281         return nfserr;
3282 }
3283
3284 static __be32
3285 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3286                      struct nfsd4_secinfo *secinfo)
3287 {
3288         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3289 }
3290
3291 static __be32
3292 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3293                      struct nfsd4_secinfo_no_name *secinfo)
3294 {
3295         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3296 }
3297
3298 /*
3299  * The SETATTR encode routine is special -- it always encodes a bitmap,
3300  * regardless of the error status.
3301  */
3302 static __be32
3303 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3304 {
3305         __be32 *p;
3306
3307         RESERVE_SPACE(16);
3308         if (nfserr) {
3309                 WRITE32(3);
3310                 WRITE32(0);
3311                 WRITE32(0);
3312                 WRITE32(0);
3313         }
3314         else {
3315                 WRITE32(3);
3316                 WRITE32(setattr->sa_bmval[0]);
3317                 WRITE32(setattr->sa_bmval[1]);
3318                 WRITE32(setattr->sa_bmval[2]);
3319         }
3320         ADJUST_ARGS();
3321         return nfserr;
3322 }
3323
3324 static __be32
3325 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3326 {
3327         __be32 *p;
3328
3329         if (!nfserr) {
3330                 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3331                 WRITEMEM(&scd->se_clientid, 8);
3332                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3333                 ADJUST_ARGS();
3334         }
3335         else if (nfserr == nfserr_clid_inuse) {
3336                 RESERVE_SPACE(8);
3337                 WRITE32(0);
3338                 WRITE32(0);
3339                 ADJUST_ARGS();
3340         }
3341         return nfserr;
3342 }
3343
3344 static __be32
3345 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3346 {
3347         __be32 *p;
3348
3349         if (!nfserr) {
3350                 RESERVE_SPACE(16);
3351                 WRITE32(write->wr_bytes_written);
3352                 WRITE32(write->wr_how_written);
3353                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3354                 ADJUST_ARGS();
3355         }
3356         return nfserr;
3357 }
3358
3359 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3360         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3361               1 << (OP_EXCHANGE_ID - 32) |
3362               1 << (OP_CREATE_SESSION - 32) |
3363               1 << (OP_DESTROY_SESSION - 32) |
3364               1 << (OP_DESTROY_CLIENTID - 32)
3365 };
3366
3367 static __be32
3368 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3369                          struct nfsd4_exchange_id *exid)
3370 {
3371         __be32 *p;
3372         char *major_id;
3373         char *server_scope;
3374         int major_id_sz;
3375         int server_scope_sz;
3376         uint64_t minor_id = 0;
3377
3378         if (nfserr)
3379                 return nfserr;
3380
3381         major_id = utsname()->nodename;
3382         major_id_sz = strlen(major_id);
3383         server_scope = utsname()->nodename;
3384         server_scope_sz = strlen(server_scope);
3385
3386         RESERVE_SPACE(
3387                 8 /* eir_clientid */ +
3388                 4 /* eir_sequenceid */ +
3389                 4 /* eir_flags */ +
3390                 4 /* spr_how */);
3391
3392         WRITEMEM(&exid->clientid, 8);
3393         WRITE32(exid->seqid);
3394         WRITE32(exid->flags);
3395
3396         WRITE32(exid->spa_how);
3397         ADJUST_ARGS();
3398
3399         switch (exid->spa_how) {
3400         case SP4_NONE:
3401                 break;
3402         case SP4_MACH_CRED:
3403                 /* spo_must_enforce, spo_must_allow */
3404                 RESERVE_SPACE(16);
3405
3406                 /* spo_must_enforce bitmap: */
3407                 WRITE32(2);
3408                 WRITE32(nfs4_minimal_spo_must_enforce[0]);
3409                 WRITE32(nfs4_minimal_spo_must_enforce[1]);
3410                 /* empty spo_must_allow bitmap: */
3411                 WRITE32(0);
3412
3413                 ADJUST_ARGS();
3414                 break;
3415         default:
3416                 WARN_ON_ONCE(1);
3417         }
3418
3419         RESERVE_SPACE(
3420                 8 /* so_minor_id */ +
3421                 4 /* so_major_id.len */ +
3422                 (XDR_QUADLEN(major_id_sz) * 4) +
3423                 4 /* eir_server_scope.len */ +
3424                 (XDR_QUADLEN(server_scope_sz) * 4) +
3425                 4 /* eir_server_impl_id.count (0) */);
3426
3427         /* The server_owner struct */
3428         WRITE64(minor_id);      /* Minor id */
3429         /* major id */
3430         WRITE32(major_id_sz);
3431         WRITEMEM(major_id, major_id_sz);
3432
3433         /* Server scope */
3434         WRITE32(server_scope_sz);
3435         WRITEMEM(server_scope, server_scope_sz);
3436
3437         /* Implementation id */
3438         WRITE32(0);     /* zero length nfs_impl_id4 array */
3439         ADJUST_ARGS();
3440         return 0;
3441 }
3442
3443 static __be32
3444 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3445                             struct nfsd4_create_session *sess)
3446 {
3447         __be32 *p;
3448
3449         if (nfserr)
3450                 return nfserr;
3451
3452         RESERVE_SPACE(24);
3453         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3454         WRITE32(sess->seqid);
3455         WRITE32(sess->flags);
3456         ADJUST_ARGS();
3457
3458         RESERVE_SPACE(28);
3459         WRITE32(0); /* headerpadsz */
3460         WRITE32(sess->fore_channel.maxreq_sz);
3461         WRITE32(sess->fore_channel.maxresp_sz);
3462         WRITE32(sess->fore_channel.maxresp_cached);
3463         WRITE32(sess->fore_channel.maxops);
3464         WRITE32(sess->fore_channel.maxreqs);
3465         WRITE32(sess->fore_channel.nr_rdma_attrs);
3466         ADJUST_ARGS();
3467
3468         if (sess->fore_channel.nr_rdma_attrs) {
3469                 RESERVE_SPACE(4);
3470                 WRITE32(sess->fore_channel.rdma_attrs);
3471                 ADJUST_ARGS();
3472         }
3473
3474         RESERVE_SPACE(28);
3475         WRITE32(0); /* headerpadsz */
3476         WRITE32(sess->back_channel.maxreq_sz);
3477         WRITE32(sess->back_channel.maxresp_sz);
3478         WRITE32(sess->back_channel.maxresp_cached);
3479         WRITE32(sess->back_channel.maxops);
3480         WRITE32(sess->back_channel.maxreqs);
3481         WRITE32(sess->back_channel.nr_rdma_attrs);
3482         ADJUST_ARGS();
3483
3484         if (sess->back_channel.nr_rdma_attrs) {
3485                 RESERVE_SPACE(4);
3486                 WRITE32(sess->back_channel.rdma_attrs);
3487                 ADJUST_ARGS();
3488         }
3489         return 0;
3490 }
3491
3492 static __be32
3493 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3494                       struct nfsd4_sequence *seq)
3495 {
3496         __be32 *p;
3497
3498         if (nfserr)
3499                 return nfserr;
3500
3501         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3502         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3503         WRITE32(seq->seqid);
3504         WRITE32(seq->slotid);
3505         /* Note slotid's are numbered from zero: */
3506         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3507         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3508         WRITE32(seq->status_flags);
3509
3510         ADJUST_ARGS();
3511         resp->cstate.datap = p; /* DRC cache data pointer */
3512         return 0;
3513 }
3514
3515 static __be32
3516 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3517                           struct nfsd4_test_stateid *test_stateid)
3518 {
3519         struct nfsd4_test_stateid_id *stateid, *next;
3520         __be32 *p;
3521
3522         RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3523         *p++ = htonl(test_stateid->ts_num_ids);
3524
3525         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3526                 *p++ = stateid->ts_id_status;
3527         }
3528
3529         ADJUST_ARGS();
3530         return nfserr;
3531 }
3532
3533 static __be32
3534 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3535 {
3536         return nfserr;
3537 }
3538
3539 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3540
3541 /*
3542  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3543  * since we don't need to filter out obsolete ops as this is
3544  * done in the decoding phase.
3545  */
3546 static nfsd4_enc nfsd4_enc_ops[] = {
3547         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3548         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3549         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3550         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3551         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3552         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3553         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3554         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3555         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3556         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3557         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3558         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3559         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3560         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3561         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3562         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3563         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3564         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3565         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3566         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3567         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3568         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3569         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3570         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3571         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3572         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3573         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3574         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3575         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3576         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3577         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3578         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3579         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3580         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3581         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3582         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3583         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3584
3585         /* NFSv4.1 operations */
3586         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3587         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3588         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3589         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3590         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
3591         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3592         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3593         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3594         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3595         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3596         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3597         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3598         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3599         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3600         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3601         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3602         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3603         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3604         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3605 };
3606
3607 /*
3608  * Calculate the total amount of memory that the compound response has taken
3609  * after encoding the current operation with pad.
3610  *
3611  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3612  *      which was specified at nfsd4_operation, else pad is zero.
3613  *
3614  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3615  *
3616  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3617  * will be at least a page and will therefore hold the xdr_buf head.
3618  */
3619 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3620 {
3621         struct xdr_buf *xb = &resp->rqstp->rq_res;
3622         struct nfsd4_session *session = NULL;
3623         struct nfsd4_slot *slot = resp->cstate.slot;
3624         u32 length, tlen = 0;
3625
3626         if (!nfsd4_has_session(&resp->cstate))
3627                 return 0;
3628
3629         session = resp->cstate.session;
3630         if (session == NULL)
3631                 return 0;
3632
3633         if (xb->page_len == 0) {
3634                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3635         } else {
3636                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3637                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3638
3639                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3640         }
3641         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3642                 length, xb->page_len, tlen, pad);
3643
3644         if (length > session->se_fchannel.maxresp_sz)
3645                 return nfserr_rep_too_big;
3646
3647         if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3648             length > session->se_fchannel.maxresp_cached)
3649                 return nfserr_rep_too_big_to_cache;
3650
3651         return 0;
3652 }
3653
3654 void
3655 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3656 {
3657         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3658         __be32 *statp;
3659         __be32 *p;
3660
3661         RESERVE_SPACE(8);
3662         WRITE32(op->opnum);
3663         statp = p++;    /* to be backfilled at the end */
3664         ADJUST_ARGS();
3665
3666         if (op->opnum == OP_ILLEGAL)
3667                 goto status;
3668         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3669                !nfsd4_enc_ops[op->opnum]);
3670         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3671         /* nfsd4_check_drc_limit guarantees enough room for error status */
3672         if (!op->status)
3673                 op->status = nfsd4_check_resp_size(resp, 0);
3674         if (so) {
3675                 so->so_replay.rp_status = op->status;
3676                 so->so_replay.rp_buflen = (char *)resp->p - (char *)(statp+1);
3677                 memcpy(so->so_replay.rp_buf, statp+1, so->so_replay.rp_buflen);
3678         }
3679 status:
3680         /*
3681          * Note: We write the status directly, instead of using WRITE32(),
3682          * since it is already in network byte order.
3683          */
3684         *statp = op->status;
3685 }
3686
3687 /*
3688  * Encode the reply stored in the stateowner reply cache
3689  *
3690  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3691  * previously sent already encoded operation.
3692  *
3693  * called with nfs4_lock_state() held
3694  */
3695 void
3696 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3697 {
3698         __be32 *p;
3699         struct nfs4_replay *rp = op->replay;
3700
3701         BUG_ON(!rp);
3702
3703         RESERVE_SPACE(8);
3704         WRITE32(op->opnum);
3705         *p++ = rp->rp_status;  /* already xdr'ed */
3706         ADJUST_ARGS();
3707
3708         RESERVE_SPACE(rp->rp_buflen);
3709         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3710         ADJUST_ARGS();
3711 }
3712
3713 int
3714 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3715 {
3716         return xdr_ressize_check(rqstp, p);
3717 }
3718
3719 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3720 {
3721         struct svc_rqst *rqstp = rq;
3722         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3723
3724         if (args->ops != args->iops) {
3725                 kfree(args->ops);
3726                 args->ops = args->iops;
3727         }
3728         kfree(args->tmpp);
3729         args->tmpp = NULL;
3730         while (args->to_free) {
3731                 struct tmpbuf *tb = args->to_free;
3732                 args->to_free = tb->next;
3733                 tb->release(tb->buf);
3734                 kfree(tb);
3735         }
3736         return 1;
3737 }
3738
3739 int
3740 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3741 {
3742         args->p = p;
3743         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3744         args->pagelist = rqstp->rq_arg.pages;
3745         args->pagelen = rqstp->rq_arg.page_len;
3746         args->tmpp = NULL;
3747         args->to_free = NULL;
3748         args->ops = args->iops;
3749         args->rqstp = rqstp;
3750
3751         return !nfsd4_decode_compound(args);
3752 }
3753
3754 int
3755 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3756 {
3757         /*
3758          * All that remains is to write the tag and operation count...
3759          */
3760         struct nfsd4_compound_state *cs = &resp->cstate;
3761         struct kvec *iov;
3762         p = resp->tagp;
3763         *p++ = htonl(resp->taglen);
3764         memcpy(p, resp->tag, resp->taglen);
3765         p += XDR_QUADLEN(resp->taglen);
3766         *p++ = htonl(resp->opcnt);
3767
3768         if (rqstp->rq_res.page_len)
3769                 iov = &rqstp->rq_res.tail[0];
3770         else
3771                 iov = &rqstp->rq_res.head[0];
3772         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3773         BUG_ON(iov->iov_len > PAGE_SIZE);
3774         if (nfsd4_has_session(cs)) {
3775                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3776                 struct nfs4_client *clp = cs->session->se_client;
3777                 if (cs->status != nfserr_replay_cache) {
3778                         nfsd4_store_cache_entry(resp);
3779                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3780                 }
3781                 /* Renew the clientid on success and on replay */
3782                 spin_lock(&nn->client_lock);
3783                 nfsd4_put_session(cs->session);
3784                 spin_unlock(&nn->client_lock);
3785                 put_client_renew(clp);
3786         }
3787         return 1;
3788 }
3789
3790 /*
3791  * Local variables:
3792  *  c-basic-offset: 8
3793  * End:
3794  */