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 inline __be32
1969 nfsd4_encode_aclname(struct svc_rqst *rqstp, struct nfs4_ace *ace,
1970                 __be32 **p, int *buflen)
1971 {
1972         if (ace->whotype != NFS4_ACL_WHO_NAMED)
1973                 return nfs4_acl_write_who(ace->whotype, p, buflen);
1974         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1975                 return nfsd4_encode_group(rqstp, ace->who_gid, p, buflen);
1976         else
1977                 return nfsd4_encode_user(rqstp, ace->who_uid, p, buflen);
1978 }
1979
1980 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1981                               FATTR4_WORD0_RDATTR_ERROR)
1982 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1983
1984 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1985 static inline __be32
1986 nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
1987 {
1988         __be32 *p = *pp;
1989
1990         if (*buflen < ((XDR_QUADLEN(len) << 2) + 4 + 4 + 4))
1991                 return nfserr_resource;
1992
1993         /*
1994          * For now we use a 0 here to indicate the null translation; in
1995          * the future we may place a call to translation code here.
1996          */
1997         if ((*buflen -= 8) < 0)
1998                 return nfserr_resource;
1999
2000         WRITE32(0); /* lfs */
2001         WRITE32(0); /* pi */
2002         p = xdr_encode_opaque(p, context, len);
2003         *buflen -= (XDR_QUADLEN(len) << 2) + 4;
2004
2005         *pp = p;
2006         return 0;
2007 }
2008 #else
2009 static inline __be32
2010 nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
2011 { return 0; }
2012 #endif
2013
2014 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2015 {
2016         /* As per referral draft:  */
2017         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2018             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2019                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2020                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2021                         *rdattr_err = NFSERR_MOVED;
2022                 else
2023                         return nfserr_moved;
2024         }
2025         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2026         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2027         return 0;
2028 }
2029
2030
2031 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2032 {
2033         struct path path = exp->ex_path;
2034         int err;
2035
2036         path_get(&path);
2037         while (follow_up(&path)) {
2038                 if (path.dentry != path.mnt->mnt_root)
2039                         break;
2040         }
2041         err = vfs_getattr(&path, stat);
2042         path_put(&path);
2043         return err;
2044 }
2045
2046 /*
2047  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2048  * ourselves.
2049  *
2050  * countp is the buffer size in _words_
2051  */
2052 __be32
2053 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2054                 struct dentry *dentry, __be32 **buffer, int count, u32 *bmval,
2055                 struct svc_rqst *rqstp, int ignore_crossmnt)
2056 {
2057         u32 bmval0 = bmval[0];
2058         u32 bmval1 = bmval[1];
2059         u32 bmval2 = bmval[2];
2060         struct kstat stat;
2061         struct svc_fh *tempfh = NULL;
2062         struct kstatfs statfs;
2063         int buflen = count << 2;
2064         __be32 *attrlenp;
2065         u32 dummy;
2066         u64 dummy64;
2067         u32 rdattr_err = 0;
2068         __be32 *p = *buffer;
2069         __be32 status;
2070         int err;
2071         int aclsupport = 0;
2072         struct nfs4_acl *acl = NULL;
2073         void *context = NULL;
2074         int contextlen;
2075         bool contextsupport = false;
2076         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2077         u32 minorversion = resp->cstate.minorversion;
2078         struct path path = {
2079                 .mnt    = exp->ex_path.mnt,
2080                 .dentry = dentry,
2081         };
2082         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2083
2084         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2085         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2086         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2087         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2088
2089         if (exp->ex_fslocs.migrated) {
2090                 BUG_ON(bmval[2]);
2091                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2092                 if (status)
2093                         goto out;
2094         }
2095
2096         err = vfs_getattr(&path, &stat);
2097         if (err)
2098                 goto out_nfserr;
2099         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2100                         FATTR4_WORD0_MAXNAME)) ||
2101             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2102                        FATTR4_WORD1_SPACE_TOTAL))) {
2103                 err = vfs_statfs(&path, &statfs);
2104                 if (err)
2105                         goto out_nfserr;
2106         }
2107         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2108                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2109                 status = nfserr_jukebox;
2110                 if (!tempfh)
2111                         goto out;
2112                 fh_init(tempfh, NFS4_FHSIZE);
2113                 status = fh_compose(tempfh, exp, dentry, NULL);
2114                 if (status)
2115                         goto out;
2116                 fhp = tempfh;
2117         }
2118         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2119                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2120                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2121                 aclsupport = (err == 0);
2122                 if (bmval0 & FATTR4_WORD0_ACL) {
2123                         if (err == -EOPNOTSUPP)
2124                                 bmval0 &= ~FATTR4_WORD0_ACL;
2125                         else if (err == -EINVAL) {
2126                                 status = nfserr_attrnotsupp;
2127                                 goto out;
2128                         } else if (err != 0)
2129                                 goto out_nfserr;
2130                 }
2131         }
2132
2133 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2134         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2135                         bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2136                 err = security_inode_getsecctx(dentry->d_inode,
2137                                                 &context, &contextlen);
2138                 contextsupport = (err == 0);
2139                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2140                         if (err == -EOPNOTSUPP)
2141                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2142                         else if (err)
2143                                 goto out_nfserr;
2144                 }
2145         }
2146 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2147
2148         if (bmval2) {
2149                 if ((buflen -= 16) < 0)
2150                         goto out_resource;
2151                 WRITE32(3);
2152                 WRITE32(bmval0);
2153                 WRITE32(bmval1);
2154                 WRITE32(bmval2);
2155         } else if (bmval1) {
2156                 if ((buflen -= 12) < 0)
2157                         goto out_resource;
2158                 WRITE32(2);
2159                 WRITE32(bmval0);
2160                 WRITE32(bmval1);
2161         } else {
2162                 if ((buflen -= 8) < 0)
2163                         goto out_resource;
2164                 WRITE32(1);
2165                 WRITE32(bmval0);
2166         }
2167         attrlenp = p++;                /* to be backfilled later */
2168
2169         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2170                 u32 word0 = nfsd_suppattrs0(minorversion);
2171                 u32 word1 = nfsd_suppattrs1(minorversion);
2172                 u32 word2 = nfsd_suppattrs2(minorversion);
2173
2174                 if (!aclsupport)
2175                         word0 &= ~FATTR4_WORD0_ACL;
2176                 if (!contextsupport)
2177                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2178                 if (!word2) {
2179                         if ((buflen -= 12) < 0)
2180                                 goto out_resource;
2181                         WRITE32(2);
2182                         WRITE32(word0);
2183                         WRITE32(word1);
2184                 } else {
2185                         if ((buflen -= 16) < 0)
2186                                 goto out_resource;
2187                         WRITE32(3);
2188                         WRITE32(word0);
2189                         WRITE32(word1);
2190                         WRITE32(word2);
2191                 }
2192         }
2193         if (bmval0 & FATTR4_WORD0_TYPE) {
2194                 if ((buflen -= 4) < 0)
2195                         goto out_resource;
2196                 dummy = nfs4_file_type(stat.mode);
2197                 if (dummy == NF4BAD) {
2198                         status = nfserr_serverfault;
2199                         goto out;
2200                 }
2201                 WRITE32(dummy);
2202         }
2203         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2204                 if ((buflen -= 4) < 0)
2205                         goto out_resource;
2206                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2207                         WRITE32(NFS4_FH_PERSISTENT);
2208                 else
2209                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2210         }
2211         if (bmval0 & FATTR4_WORD0_CHANGE) {
2212                 if ((buflen -= 8) < 0)
2213                         goto out_resource;
2214                 write_change(&p, &stat, dentry->d_inode);
2215         }
2216         if (bmval0 & FATTR4_WORD0_SIZE) {
2217                 if ((buflen -= 8) < 0)
2218                         goto out_resource;
2219                 WRITE64(stat.size);
2220         }
2221         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2222                 if ((buflen -= 4) < 0)
2223                         goto out_resource;
2224                 WRITE32(1);
2225         }
2226         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2227                 if ((buflen -= 4) < 0)
2228                         goto out_resource;
2229                 WRITE32(1);
2230         }
2231         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2232                 if ((buflen -= 4) < 0)
2233                         goto out_resource;
2234                 WRITE32(0);
2235         }
2236         if (bmval0 & FATTR4_WORD0_FSID) {
2237                 if ((buflen -= 16) < 0)
2238                         goto out_resource;
2239                 if (exp->ex_fslocs.migrated) {
2240                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2241                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2242                 } else switch(fsid_source(fhp)) {
2243                 case FSIDSOURCE_FSID:
2244                         WRITE64((u64)exp->ex_fsid);
2245                         WRITE64((u64)0);
2246                         break;
2247                 case FSIDSOURCE_DEV:
2248                         WRITE32(0);
2249                         WRITE32(MAJOR(stat.dev));
2250                         WRITE32(0);
2251                         WRITE32(MINOR(stat.dev));
2252                         break;
2253                 case FSIDSOURCE_UUID:
2254                         WRITEMEM(exp->ex_uuid, 16);
2255                         break;
2256                 }
2257         }
2258         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2259                 if ((buflen -= 4) < 0)
2260                         goto out_resource;
2261                 WRITE32(0);
2262         }
2263         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2264                 if ((buflen -= 4) < 0)
2265                         goto out_resource;
2266                 WRITE32(nn->nfsd4_lease);
2267         }
2268         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2269                 if ((buflen -= 4) < 0)
2270                         goto out_resource;
2271                 WRITE32(rdattr_err);
2272         }
2273         if (bmval0 & FATTR4_WORD0_ACL) {
2274                 struct nfs4_ace *ace;
2275
2276                 if (acl == NULL) {
2277                         if ((buflen -= 4) < 0)
2278                                 goto out_resource;
2279
2280                         WRITE32(0);
2281                         goto out_acl;
2282                 }
2283                 if ((buflen -= 4) < 0)
2284                         goto out_resource;
2285                 WRITE32(acl->naces);
2286
2287                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2288                         if ((buflen -= 4*3) < 0)
2289                                 goto out_resource;
2290                         WRITE32(ace->type);
2291                         WRITE32(ace->flag);
2292                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2293                         status = nfsd4_encode_aclname(rqstp, ace, &p, &buflen);
2294                         if (status)
2295                                 goto out;
2296                 }
2297         }
2298 out_acl:
2299         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2300                 if ((buflen -= 4) < 0)
2301                         goto out_resource;
2302                 WRITE32(aclsupport ?
2303                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2304         }
2305         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2306                 if ((buflen -= 4) < 0)
2307                         goto out_resource;
2308                 WRITE32(1);
2309         }
2310         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2311                 if ((buflen -= 4) < 0)
2312                         goto out_resource;
2313                 WRITE32(0);
2314         }
2315         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2316                 if ((buflen -= 4) < 0)
2317                         goto out_resource;
2318                 WRITE32(1);
2319         }
2320         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2321                 if ((buflen -= 4) < 0)
2322                         goto out_resource;
2323                 WRITE32(1);
2324         }
2325         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2326                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2327                 if (buflen < 0)
2328                         goto out_resource;
2329                 WRITE32(fhp->fh_handle.fh_size);
2330                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2331         }
2332         if (bmval0 & FATTR4_WORD0_FILEID) {
2333                 if ((buflen -= 8) < 0)
2334                         goto out_resource;
2335                 WRITE64(stat.ino);
2336         }
2337         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2338                 if ((buflen -= 8) < 0)
2339                         goto out_resource;
2340                 WRITE64((u64) statfs.f_ffree);
2341         }
2342         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2343                 if ((buflen -= 8) < 0)
2344                         goto out_resource;
2345                 WRITE64((u64) statfs.f_ffree);
2346         }
2347         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2348                 if ((buflen -= 8) < 0)
2349                         goto out_resource;
2350                 WRITE64((u64) statfs.f_files);
2351         }
2352         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2353                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2354                 if (status)
2355                         goto out;
2356         }
2357         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2358                 if ((buflen -= 4) < 0)
2359                         goto out_resource;
2360                 WRITE32(1);
2361         }
2362         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2363                 if ((buflen -= 8) < 0)
2364                         goto out_resource;
2365                 WRITE64(exp->ex_path.mnt->mnt_sb->s_maxbytes);
2366         }
2367         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2368                 if ((buflen -= 4) < 0)
2369                         goto out_resource;
2370                 WRITE32(255);
2371         }
2372         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2373                 if ((buflen -= 4) < 0)
2374                         goto out_resource;
2375                 WRITE32(statfs.f_namelen);
2376         }
2377         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2378                 if ((buflen -= 8) < 0)
2379                         goto out_resource;
2380                 WRITE64((u64) svc_max_payload(rqstp));
2381         }
2382         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2383                 if ((buflen -= 8) < 0)
2384                         goto out_resource;
2385                 WRITE64((u64) svc_max_payload(rqstp));
2386         }
2387         if (bmval1 & FATTR4_WORD1_MODE) {
2388                 if ((buflen -= 4) < 0)
2389                         goto out_resource;
2390                 WRITE32(stat.mode & S_IALLUGO);
2391         }
2392         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2393                 if ((buflen -= 4) < 0)
2394                         goto out_resource;
2395                 WRITE32(1);
2396         }
2397         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2398                 if ((buflen -= 4) < 0)
2399                         goto out_resource;
2400                 WRITE32(stat.nlink);
2401         }
2402         if (bmval1 & FATTR4_WORD1_OWNER) {
2403                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2404                 if (status)
2405                         goto out;
2406         }
2407         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2408                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2409                 if (status)
2410                         goto out;
2411         }
2412         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2413                 if ((buflen -= 8) < 0)
2414                         goto out_resource;
2415                 WRITE32((u32) MAJOR(stat.rdev));
2416                 WRITE32((u32) MINOR(stat.rdev));
2417         }
2418         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2419                 if ((buflen -= 8) < 0)
2420                         goto out_resource;
2421                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2422                 WRITE64(dummy64);
2423         }
2424         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2425                 if ((buflen -= 8) < 0)
2426                         goto out_resource;
2427                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2428                 WRITE64(dummy64);
2429         }
2430         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2431                 if ((buflen -= 8) < 0)
2432                         goto out_resource;
2433                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2434                 WRITE64(dummy64);
2435         }
2436         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2437                 if ((buflen -= 8) < 0)
2438                         goto out_resource;
2439                 dummy64 = (u64)stat.blocks << 9;
2440                 WRITE64(dummy64);
2441         }
2442         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2443                 if ((buflen -= 12) < 0)
2444                         goto out_resource;
2445                 WRITE64((s64)stat.atime.tv_sec);
2446                 WRITE32(stat.atime.tv_nsec);
2447         }
2448         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2449                 if ((buflen -= 12) < 0)
2450                         goto out_resource;
2451                 WRITE32(0);
2452                 WRITE32(1);
2453                 WRITE32(0);
2454         }
2455         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2456                 if ((buflen -= 12) < 0)
2457                         goto out_resource;
2458                 WRITE64((s64)stat.ctime.tv_sec);
2459                 WRITE32(stat.ctime.tv_nsec);
2460         }
2461         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2462                 if ((buflen -= 12) < 0)
2463                         goto out_resource;
2464                 WRITE64((s64)stat.mtime.tv_sec);
2465                 WRITE32(stat.mtime.tv_nsec);
2466         }
2467         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2468                 if ((buflen -= 8) < 0)
2469                         goto out_resource;
2470                 /*
2471                  * Get parent's attributes if not ignoring crossmount
2472                  * and this is the root of a cross-mounted filesystem.
2473                  */
2474                 if (ignore_crossmnt == 0 &&
2475                     dentry == exp->ex_path.mnt->mnt_root)
2476                         get_parent_attributes(exp, &stat);
2477                 WRITE64(stat.ino);
2478         }
2479         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2480                 status = nfsd4_encode_security_label(rqstp, context,
2481                                 contextlen, &p, &buflen);
2482                 if (status)
2483                         goto out;
2484         }
2485         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2486                 WRITE32(3);
2487                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2488                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2489                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2490         }
2491
2492         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2493         *buffer = p;
2494         status = nfs_ok;
2495
2496 out:
2497 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2498         if (context)
2499                 security_release_secctx(context, contextlen);
2500 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2501         kfree(acl);
2502         if (tempfh)
2503                 fh_put(tempfh);
2504         return status;
2505 out_nfserr:
2506         status = nfserrno(err);
2507         goto out;
2508 out_resource:
2509         status = nfserr_resource;
2510         goto out;
2511 }
2512
2513 static inline int attributes_need_mount(u32 *bmval)
2514 {
2515         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2516                 return 1;
2517         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2518                 return 1;
2519         return 0;
2520 }
2521
2522 static __be32
2523 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2524                 const char *name, int namlen, __be32 **p, int buflen)
2525 {
2526         struct svc_export *exp = cd->rd_fhp->fh_export;
2527         struct dentry *dentry;
2528         __be32 nfserr;
2529         int ignore_crossmnt = 0;
2530
2531         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2532         if (IS_ERR(dentry))
2533                 return nfserrno(PTR_ERR(dentry));
2534         if (!dentry->d_inode) {
2535                 /*
2536                  * nfsd_buffered_readdir drops the i_mutex between
2537                  * readdir and calling this callback, leaving a window
2538                  * where this directory entry could have gone away.
2539                  */
2540                 dput(dentry);
2541                 return nfserr_noent;
2542         }
2543
2544         exp_get(exp);
2545         /*
2546          * In the case of a mountpoint, the client may be asking for
2547          * attributes that are only properties of the underlying filesystem
2548          * as opposed to the cross-mounted file system. In such a case,
2549          * we will not follow the cross mount and will fill the attribtutes
2550          * directly from the mountpoint dentry.
2551          */
2552         if (nfsd_mountpoint(dentry, exp)) {
2553                 int err;
2554
2555                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2556                                 && !attributes_need_mount(cd->rd_bmval)) {
2557                         ignore_crossmnt = 1;
2558                         goto out_encode;
2559                 }
2560                 /*
2561                  * Why the heck aren't we just using nfsd_lookup??
2562                  * Different "."/".." handling?  Something else?
2563                  * At least, add a comment here to explain....
2564                  */
2565                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2566                 if (err) {
2567                         nfserr = nfserrno(err);
2568                         goto out_put;
2569                 }
2570                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2571                 if (nfserr)
2572                         goto out_put;
2573
2574         }
2575 out_encode:
2576         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2577                                         cd->rd_rqstp, ignore_crossmnt);
2578 out_put:
2579         dput(dentry);
2580         exp_put(exp);
2581         return nfserr;
2582 }
2583
2584 static __be32 *
2585 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2586 {
2587         if (buflen < 6)
2588                 return NULL;
2589         *p++ = htonl(2);
2590         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2591         *p++ = htonl(0);                         /* bmval1 */
2592
2593         *p++ = htonl(4);     /* attribute length */
2594         *p++ = nfserr;       /* no htonl */
2595         return p;
2596 }
2597
2598 static int
2599 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2600                     loff_t offset, u64 ino, unsigned int d_type)
2601 {
2602         struct readdir_cd *ccd = ccdv;
2603         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2604         int buflen;
2605         __be32 *p = cd->buffer;
2606         __be32 *cookiep;
2607         __be32 nfserr = nfserr_toosmall;
2608
2609         /* In nfsv4, "." and ".." never make it onto the wire.. */
2610         if (name && isdotent(name, namlen)) {
2611                 cd->common.err = nfs_ok;
2612                 return 0;
2613         }
2614
2615         if (cd->offset)
2616                 xdr_encode_hyper(cd->offset, (u64) offset);
2617
2618         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2619         if (buflen < 0)
2620                 goto fail;
2621
2622         *p++ = xdr_one;                             /* mark entry present */
2623         cookiep = p;
2624         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2625         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2626
2627         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, &p, buflen);
2628         switch (nfserr) {
2629         case nfs_ok:
2630                 break;
2631         case nfserr_resource:
2632                 nfserr = nfserr_toosmall;
2633                 goto fail;
2634         case nfserr_noent:
2635                 goto skip_entry;
2636         default:
2637                 /*
2638                  * If the client requested the RDATTR_ERROR attribute,
2639                  * we stuff the error code into this attribute
2640                  * and continue.  If this attribute was not requested,
2641                  * then in accordance with the spec, we fail the
2642                  * entire READDIR operation(!)
2643                  */
2644                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2645                         goto fail;
2646                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2647                 if (p == NULL) {
2648                         nfserr = nfserr_toosmall;
2649                         goto fail;
2650                 }
2651         }
2652         cd->buflen -= (p - cd->buffer);
2653         cd->buffer = p;
2654         cd->offset = cookiep;
2655 skip_entry:
2656         cd->common.err = nfs_ok;
2657         return 0;
2658 fail:
2659         cd->common.err = nfserr;
2660         return -EINVAL;
2661 }
2662
2663 static void
2664 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2665 {
2666         __be32 *p;
2667
2668         RESERVE_SPACE(sizeof(stateid_t));
2669         WRITE32(sid->si_generation);
2670         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2671         ADJUST_ARGS();
2672 }
2673
2674 static __be32
2675 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2676 {
2677         __be32 *p;
2678
2679         if (!nfserr) {
2680                 RESERVE_SPACE(8);
2681                 WRITE32(access->ac_supported);
2682                 WRITE32(access->ac_resp_access);
2683                 ADJUST_ARGS();
2684         }
2685         return nfserr;
2686 }
2687
2688 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2689 {
2690         __be32 *p;
2691
2692         if (!nfserr) {
2693                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2694                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2695                 WRITE32(bcts->dir);
2696                 /* Sorry, we do not yet support RDMA over 4.1: */
2697                 WRITE32(0);
2698                 ADJUST_ARGS();
2699         }
2700         return nfserr;
2701 }
2702
2703 static __be32
2704 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2705 {
2706         if (!nfserr)
2707                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2708
2709         return nfserr;
2710 }
2711
2712
2713 static __be32
2714 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2715 {
2716         __be32 *p;
2717
2718         if (!nfserr) {
2719                 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2720                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2721                 ADJUST_ARGS();
2722         }
2723         return nfserr;
2724 }
2725
2726 static __be32
2727 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2728 {
2729         __be32 *p;
2730
2731         if (!nfserr) {
2732                 RESERVE_SPACE(32);
2733                 write_cinfo(&p, &create->cr_cinfo);
2734                 WRITE32(2);
2735                 WRITE32(create->cr_bmval[0]);
2736                 WRITE32(create->cr_bmval[1]);
2737                 ADJUST_ARGS();
2738         }
2739         return nfserr;
2740 }
2741
2742 static __be32
2743 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2744 {
2745         struct svc_fh *fhp = getattr->ga_fhp;
2746         int buflen;
2747
2748         if (nfserr)
2749                 return nfserr;
2750
2751         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2752         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2753                                     &resp->p, buflen, getattr->ga_bmval,
2754                                     resp->rqstp, 0);
2755         return nfserr;
2756 }
2757
2758 static __be32
2759 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2760 {
2761         struct svc_fh *fhp = *fhpp;
2762         unsigned int len;
2763         __be32 *p;
2764
2765         if (!nfserr) {
2766                 len = fhp->fh_handle.fh_size;
2767                 RESERVE_SPACE(len + 4);
2768                 WRITE32(len);
2769                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2770                 ADJUST_ARGS();
2771         }
2772         return nfserr;
2773 }
2774
2775 /*
2776 * Including all fields other than the name, a LOCK4denied structure requires
2777 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2778 */
2779 static void
2780 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2781 {
2782         struct xdr_netobj *conf = &ld->ld_owner;
2783         __be32 *p;
2784
2785         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2786         WRITE64(ld->ld_start);
2787         WRITE64(ld->ld_length);
2788         WRITE32(ld->ld_type);
2789         if (conf->len) {
2790                 WRITEMEM(&ld->ld_clientid, 8);
2791                 WRITE32(conf->len);
2792                 WRITEMEM(conf->data, conf->len);
2793                 kfree(conf->data);
2794         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2795                 WRITE64((u64)0); /* clientid */
2796                 WRITE32(0); /* length of owner name */
2797         }
2798         ADJUST_ARGS();
2799 }
2800
2801 static __be32
2802 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2803 {
2804         if (!nfserr)
2805                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2806         else if (nfserr == nfserr_denied)
2807                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2808
2809         return nfserr;
2810 }
2811
2812 static __be32
2813 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2814 {
2815         if (nfserr == nfserr_denied)
2816                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2817         return nfserr;
2818 }
2819
2820 static __be32
2821 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2822 {
2823         if (!nfserr)
2824                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2825
2826         return nfserr;
2827 }
2828
2829
2830 static __be32
2831 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2832 {
2833         __be32 *p;
2834
2835         if (!nfserr) {
2836                 RESERVE_SPACE(20);
2837                 write_cinfo(&p, &link->li_cinfo);
2838                 ADJUST_ARGS();
2839         }
2840         return nfserr;
2841 }
2842
2843
2844 static __be32
2845 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2846 {
2847         __be32 *p;
2848
2849         if (nfserr)
2850                 goto out;
2851
2852         nfsd4_encode_stateid(resp, &open->op_stateid);
2853         RESERVE_SPACE(40);
2854         write_cinfo(&p, &open->op_cinfo);
2855         WRITE32(open->op_rflags);
2856         WRITE32(2);
2857         WRITE32(open->op_bmval[0]);
2858         WRITE32(open->op_bmval[1]);
2859         WRITE32(open->op_delegate_type);
2860         ADJUST_ARGS();
2861
2862         switch (open->op_delegate_type) {
2863         case NFS4_OPEN_DELEGATE_NONE:
2864                 break;
2865         case NFS4_OPEN_DELEGATE_READ:
2866                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2867                 RESERVE_SPACE(20);
2868                 WRITE32(open->op_recall);
2869
2870                 /*
2871                  * TODO: ACE's in delegations
2872                  */
2873                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2874                 WRITE32(0);
2875                 WRITE32(0);
2876                 WRITE32(0);   /* XXX: is NULL principal ok? */
2877                 ADJUST_ARGS();
2878                 break;
2879         case NFS4_OPEN_DELEGATE_WRITE:
2880                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2881                 RESERVE_SPACE(32);
2882                 WRITE32(0);
2883
2884                 /*
2885                  * TODO: space_limit's in delegations
2886                  */
2887                 WRITE32(NFS4_LIMIT_SIZE);
2888                 WRITE32(~(u32)0);
2889                 WRITE32(~(u32)0);
2890
2891                 /*
2892                  * TODO: ACE's in delegations
2893                  */
2894                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2895                 WRITE32(0);
2896                 WRITE32(0);
2897                 WRITE32(0);   /* XXX: is NULL principal ok? */
2898                 ADJUST_ARGS();
2899                 break;
2900         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2901                 switch (open->op_why_no_deleg) {
2902                 case WND4_CONTENTION:
2903                 case WND4_RESOURCE:
2904                         RESERVE_SPACE(8);
2905                         WRITE32(open->op_why_no_deleg);
2906                         WRITE32(0);     /* deleg signaling not supported yet */
2907                         break;
2908                 default:
2909                         RESERVE_SPACE(4);
2910                         WRITE32(open->op_why_no_deleg);
2911                 }
2912                 ADJUST_ARGS();
2913                 break;
2914         default:
2915                 BUG();
2916         }
2917         /* XXX save filehandle here */
2918 out:
2919         return nfserr;
2920 }
2921
2922 static __be32
2923 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2924 {
2925         if (!nfserr)
2926                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2927
2928         return nfserr;
2929 }
2930
2931 static __be32
2932 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2933 {
2934         if (!nfserr)
2935                 nfsd4_encode_stateid(resp, &od->od_stateid);
2936
2937         return nfserr;
2938 }
2939
2940 static __be32
2941 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2942                   struct nfsd4_read *read)
2943 {
2944         u32 eof;
2945         int v;
2946         struct page *page;
2947         unsigned long maxcount;
2948         long len;
2949         __be32 *p;
2950
2951         if (nfserr)
2952                 return nfserr;
2953         if (resp->xbuf->page_len)
2954                 return nfserr_resource;
2955
2956         RESERVE_SPACE(8); /* eof flag and byte count */
2957
2958         maxcount = svc_max_payload(resp->rqstp);
2959         if (maxcount > read->rd_length)
2960                 maxcount = read->rd_length;
2961
2962         len = maxcount;
2963         v = 0;
2964         while (len > 0) {
2965                 page = *(resp->rqstp->rq_next_page);
2966                 if (!page) { /* ran out of pages */
2967                         maxcount -= len;
2968                         break;
2969                 }
2970                 resp->rqstp->rq_vec[v].iov_base = page_address(page);
2971                 resp->rqstp->rq_vec[v].iov_len =
2972                         len < PAGE_SIZE ? len : PAGE_SIZE;
2973                 resp->rqstp->rq_next_page++;
2974                 v++;
2975                 len -= PAGE_SIZE;
2976         }
2977         read->rd_vlen = v;
2978
2979         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2980                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2981                         &maxcount);
2982
2983         if (nfserr)
2984                 return nfserr;
2985         eof = (read->rd_offset + maxcount >=
2986                read->rd_fhp->fh_dentry->d_inode->i_size);
2987
2988         WRITE32(eof);
2989         WRITE32(maxcount);
2990         ADJUST_ARGS();
2991         resp->xbuf->head[0].iov_len = (char*)p
2992                                         - (char*)resp->xbuf->head[0].iov_base;
2993         resp->xbuf->page_len = maxcount;
2994
2995         /* Use rest of head for padding and remaining ops: */
2996         resp->xbuf->tail[0].iov_base = p;
2997         resp->xbuf->tail[0].iov_len = 0;
2998         if (maxcount&3) {
2999                 RESERVE_SPACE(4);
3000                 WRITE32(0);
3001                 resp->xbuf->tail[0].iov_base += maxcount&3;
3002                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3003                 ADJUST_ARGS();
3004         }
3005         return 0;
3006 }
3007
3008 static __be32
3009 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3010 {
3011         int maxcount;
3012         char *page;
3013         __be32 *p;
3014
3015         if (nfserr)
3016                 return nfserr;
3017         if (resp->xbuf->page_len)
3018                 return nfserr_resource;
3019         if (!*resp->rqstp->rq_next_page)
3020                 return nfserr_resource;
3021
3022         page = page_address(*(resp->rqstp->rq_next_page++));
3023
3024         maxcount = PAGE_SIZE;
3025         RESERVE_SPACE(4);
3026
3027         /*
3028          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3029          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3030          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3031          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3032          */
3033         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
3034         if (nfserr == nfserr_isdir)
3035                 return nfserr_inval;
3036         if (nfserr)
3037                 return nfserr;
3038
3039         WRITE32(maxcount);
3040         ADJUST_ARGS();
3041         resp->xbuf->head[0].iov_len = (char*)p
3042                                 - (char*)resp->xbuf->head[0].iov_base;
3043         resp->xbuf->page_len = maxcount;
3044
3045         /* Use rest of head for padding and remaining ops: */
3046         resp->xbuf->tail[0].iov_base = p;
3047         resp->xbuf->tail[0].iov_len = 0;
3048         if (maxcount&3) {
3049                 RESERVE_SPACE(4);
3050                 WRITE32(0);
3051                 resp->xbuf->tail[0].iov_base += maxcount&3;
3052                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3053                 ADJUST_ARGS();
3054         }
3055         return 0;
3056 }
3057
3058 static __be32
3059 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3060 {
3061         int maxcount;
3062         loff_t offset;
3063         __be32 *page, *savep, *tailbase;
3064         __be32 *p;
3065
3066         if (nfserr)
3067                 return nfserr;
3068         if (resp->xbuf->page_len)
3069                 return nfserr_resource;
3070         if (!*resp->rqstp->rq_next_page)
3071                 return nfserr_resource;
3072
3073         RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3074         savep = p;
3075
3076         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3077         WRITE32(0);
3078         WRITE32(0);
3079         ADJUST_ARGS();
3080         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3081         tailbase = p;
3082
3083         maxcount = PAGE_SIZE;
3084         if (maxcount > readdir->rd_maxcount)
3085                 maxcount = readdir->rd_maxcount;
3086
3087         /*
3088          * Convert from bytes to words, account for the two words already
3089          * written, make sure to leave two words at the end for the next
3090          * pointer and eof field.
3091          */
3092         maxcount = (maxcount >> 2) - 4;
3093         if (maxcount < 0) {
3094                 nfserr =  nfserr_toosmall;
3095                 goto err_no_verf;
3096         }
3097
3098         page = page_address(*(resp->rqstp->rq_next_page++));
3099         readdir->common.err = 0;
3100         readdir->buflen = maxcount;
3101         readdir->buffer = page;
3102         readdir->offset = NULL;
3103
3104         offset = readdir->rd_cookie;
3105         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3106                               &offset,
3107                               &readdir->common, nfsd4_encode_dirent);
3108         if (nfserr == nfs_ok &&
3109             readdir->common.err == nfserr_toosmall &&
3110             readdir->buffer == page)
3111                 nfserr = nfserr_toosmall;
3112         if (nfserr)
3113                 goto err_no_verf;
3114
3115         if (readdir->offset)
3116                 xdr_encode_hyper(readdir->offset, offset);
3117
3118         p = readdir->buffer;
3119         *p++ = 0;       /* no more entries */
3120         *p++ = htonl(readdir->common.err == nfserr_eof);
3121         resp->xbuf->page_len = ((char*)p) -
3122                 (char*)page_address(*(resp->rqstp->rq_next_page-1));
3123
3124         /* Use rest of head for padding and remaining ops: */
3125         resp->xbuf->tail[0].iov_base = tailbase;
3126         resp->xbuf->tail[0].iov_len = 0;
3127         resp->p = resp->xbuf->tail[0].iov_base;
3128         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3129
3130         return 0;
3131 err_no_verf:
3132         p = savep;
3133         ADJUST_ARGS();
3134         return nfserr;
3135 }
3136
3137 static __be32
3138 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3139 {
3140         __be32 *p;
3141
3142         if (!nfserr) {
3143                 RESERVE_SPACE(20);
3144                 write_cinfo(&p, &remove->rm_cinfo);
3145                 ADJUST_ARGS();
3146         }
3147         return nfserr;
3148 }
3149
3150 static __be32
3151 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3152 {
3153         __be32 *p;
3154
3155         if (!nfserr) {
3156                 RESERVE_SPACE(40);
3157                 write_cinfo(&p, &rename->rn_sinfo);
3158                 write_cinfo(&p, &rename->rn_tinfo);
3159                 ADJUST_ARGS();
3160         }
3161         return nfserr;
3162 }
3163
3164 static __be32
3165 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3166                          __be32 nfserr, struct svc_export *exp)
3167 {
3168         u32 i, nflavs, supported;
3169         struct exp_flavor_info *flavs;
3170         struct exp_flavor_info def_flavs[2];
3171         __be32 *p, *flavorsp;
3172         static bool report = true;
3173
3174         if (nfserr)
3175                 goto out;
3176         if (exp->ex_nflavors) {
3177                 flavs = exp->ex_flavors;
3178                 nflavs = exp->ex_nflavors;
3179         } else { /* Handling of some defaults in absence of real secinfo: */
3180                 flavs = def_flavs;
3181                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3182                         nflavs = 2;
3183                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3184                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3185                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3186                         nflavs = 1;
3187                         flavs[0].pseudoflavor
3188                                         = svcauth_gss_flavor(exp->ex_client);
3189                 } else {
3190                         nflavs = 1;
3191                         flavs[0].pseudoflavor
3192                                         = exp->ex_client->flavour->flavour;
3193                 }
3194         }
3195
3196         supported = 0;
3197         RESERVE_SPACE(4);
3198         flavorsp = p++;         /* to be backfilled later */
3199         ADJUST_ARGS();
3200
3201         for (i = 0; i < nflavs; i++) {
3202                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3203                 struct rpcsec_gss_info info;
3204
3205                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3206                         supported++;
3207                         RESERVE_SPACE(4 + 4 + XDR_LEN(info.oid.len) + 4 + 4);
3208                         WRITE32(RPC_AUTH_GSS);
3209                         WRITE32(info.oid.len);
3210                         WRITEMEM(info.oid.data, info.oid.len);
3211                         WRITE32(info.qop);
3212                         WRITE32(info.service);
3213                         ADJUST_ARGS();
3214                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3215                         supported++;
3216                         RESERVE_SPACE(4);
3217                         WRITE32(pf);
3218                         ADJUST_ARGS();
3219                 } else {
3220                         if (report)
3221                                 pr_warn("NFS: SECINFO: security flavor %u "
3222                                         "is not supported\n", pf);
3223                 }
3224         }
3225
3226         if (nflavs != supported)
3227                 report = false;
3228         *flavorsp = htonl(supported);
3229
3230 out:
3231         if (exp)
3232                 exp_put(exp);
3233         return nfserr;
3234 }
3235
3236 static __be32
3237 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3238                      struct nfsd4_secinfo *secinfo)
3239 {
3240         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3241 }
3242
3243 static __be32
3244 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3245                      struct nfsd4_secinfo_no_name *secinfo)
3246 {
3247         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3248 }
3249
3250 /*
3251  * The SETATTR encode routine is special -- it always encodes a bitmap,
3252  * regardless of the error status.
3253  */
3254 static __be32
3255 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3256 {
3257         __be32 *p;
3258
3259         RESERVE_SPACE(16);
3260         if (nfserr) {
3261                 WRITE32(3);
3262                 WRITE32(0);
3263                 WRITE32(0);
3264                 WRITE32(0);
3265         }
3266         else {
3267                 WRITE32(3);
3268                 WRITE32(setattr->sa_bmval[0]);
3269                 WRITE32(setattr->sa_bmval[1]);
3270                 WRITE32(setattr->sa_bmval[2]);
3271         }
3272         ADJUST_ARGS();
3273         return nfserr;
3274 }
3275
3276 static __be32
3277 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3278 {
3279         __be32 *p;
3280
3281         if (!nfserr) {
3282                 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3283                 WRITEMEM(&scd->se_clientid, 8);
3284                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3285                 ADJUST_ARGS();
3286         }
3287         else if (nfserr == nfserr_clid_inuse) {
3288                 RESERVE_SPACE(8);
3289                 WRITE32(0);
3290                 WRITE32(0);
3291                 ADJUST_ARGS();
3292         }
3293         return nfserr;
3294 }
3295
3296 static __be32
3297 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3298 {
3299         __be32 *p;
3300
3301         if (!nfserr) {
3302                 RESERVE_SPACE(16);
3303                 WRITE32(write->wr_bytes_written);
3304                 WRITE32(write->wr_how_written);
3305                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3306                 ADJUST_ARGS();
3307         }
3308         return nfserr;
3309 }
3310
3311 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3312         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3313               1 << (OP_EXCHANGE_ID - 32) |
3314               1 << (OP_CREATE_SESSION - 32) |
3315               1 << (OP_DESTROY_SESSION - 32) |
3316               1 << (OP_DESTROY_CLIENTID - 32)
3317 };
3318
3319 static __be32
3320 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3321                          struct nfsd4_exchange_id *exid)
3322 {
3323         __be32 *p;
3324         char *major_id;
3325         char *server_scope;
3326         int major_id_sz;
3327         int server_scope_sz;
3328         uint64_t minor_id = 0;
3329
3330         if (nfserr)
3331                 return nfserr;
3332
3333         major_id = utsname()->nodename;
3334         major_id_sz = strlen(major_id);
3335         server_scope = utsname()->nodename;
3336         server_scope_sz = strlen(server_scope);
3337
3338         RESERVE_SPACE(
3339                 8 /* eir_clientid */ +
3340                 4 /* eir_sequenceid */ +
3341                 4 /* eir_flags */ +
3342                 4 /* spr_how */);
3343
3344         WRITEMEM(&exid->clientid, 8);
3345         WRITE32(exid->seqid);
3346         WRITE32(exid->flags);
3347
3348         WRITE32(exid->spa_how);
3349         ADJUST_ARGS();
3350
3351         switch (exid->spa_how) {
3352         case SP4_NONE:
3353                 break;
3354         case SP4_MACH_CRED:
3355                 /* spo_must_enforce, spo_must_allow */
3356                 RESERVE_SPACE(16);
3357
3358                 /* spo_must_enforce bitmap: */
3359                 WRITE32(2);
3360                 WRITE32(nfs4_minimal_spo_must_enforce[0]);
3361                 WRITE32(nfs4_minimal_spo_must_enforce[1]);
3362                 /* empty spo_must_allow bitmap: */
3363                 WRITE32(0);
3364
3365                 ADJUST_ARGS();
3366                 break;
3367         default:
3368                 WARN_ON_ONCE(1);
3369         }
3370
3371         RESERVE_SPACE(
3372                 8 /* so_minor_id */ +
3373                 4 /* so_major_id.len */ +
3374                 (XDR_QUADLEN(major_id_sz) * 4) +
3375                 4 /* eir_server_scope.len */ +
3376                 (XDR_QUADLEN(server_scope_sz) * 4) +
3377                 4 /* eir_server_impl_id.count (0) */);
3378
3379         /* The server_owner struct */
3380         WRITE64(minor_id);      /* Minor id */
3381         /* major id */
3382         WRITE32(major_id_sz);
3383         WRITEMEM(major_id, major_id_sz);
3384
3385         /* Server scope */
3386         WRITE32(server_scope_sz);
3387         WRITEMEM(server_scope, server_scope_sz);
3388
3389         /* Implementation id */
3390         WRITE32(0);     /* zero length nfs_impl_id4 array */
3391         ADJUST_ARGS();
3392         return 0;
3393 }
3394
3395 static __be32
3396 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3397                             struct nfsd4_create_session *sess)
3398 {
3399         __be32 *p;
3400
3401         if (nfserr)
3402                 return nfserr;
3403
3404         RESERVE_SPACE(24);
3405         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3406         WRITE32(sess->seqid);
3407         WRITE32(sess->flags);
3408         ADJUST_ARGS();
3409
3410         RESERVE_SPACE(28);
3411         WRITE32(0); /* headerpadsz */
3412         WRITE32(sess->fore_channel.maxreq_sz);
3413         WRITE32(sess->fore_channel.maxresp_sz);
3414         WRITE32(sess->fore_channel.maxresp_cached);
3415         WRITE32(sess->fore_channel.maxops);
3416         WRITE32(sess->fore_channel.maxreqs);
3417         WRITE32(sess->fore_channel.nr_rdma_attrs);
3418         ADJUST_ARGS();
3419
3420         if (sess->fore_channel.nr_rdma_attrs) {
3421                 RESERVE_SPACE(4);
3422                 WRITE32(sess->fore_channel.rdma_attrs);
3423                 ADJUST_ARGS();
3424         }
3425
3426         RESERVE_SPACE(28);
3427         WRITE32(0); /* headerpadsz */
3428         WRITE32(sess->back_channel.maxreq_sz);
3429         WRITE32(sess->back_channel.maxresp_sz);
3430         WRITE32(sess->back_channel.maxresp_cached);
3431         WRITE32(sess->back_channel.maxops);
3432         WRITE32(sess->back_channel.maxreqs);
3433         WRITE32(sess->back_channel.nr_rdma_attrs);
3434         ADJUST_ARGS();
3435
3436         if (sess->back_channel.nr_rdma_attrs) {
3437                 RESERVE_SPACE(4);
3438                 WRITE32(sess->back_channel.rdma_attrs);
3439                 ADJUST_ARGS();
3440         }
3441         return 0;
3442 }
3443
3444 static __be32
3445 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3446                       struct nfsd4_sequence *seq)
3447 {
3448         __be32 *p;
3449
3450         if (nfserr)
3451                 return nfserr;
3452
3453         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3454         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3455         WRITE32(seq->seqid);
3456         WRITE32(seq->slotid);
3457         /* Note slotid's are numbered from zero: */
3458         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3459         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3460         WRITE32(seq->status_flags);
3461
3462         ADJUST_ARGS();
3463         resp->cstate.datap = p; /* DRC cache data pointer */
3464         return 0;
3465 }
3466
3467 static __be32
3468 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3469                           struct nfsd4_test_stateid *test_stateid)
3470 {
3471         struct nfsd4_test_stateid_id *stateid, *next;
3472         __be32 *p;
3473
3474         RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3475         *p++ = htonl(test_stateid->ts_num_ids);
3476
3477         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3478                 *p++ = stateid->ts_id_status;
3479         }
3480
3481         ADJUST_ARGS();
3482         return nfserr;
3483 }
3484
3485 static __be32
3486 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3487 {
3488         return nfserr;
3489 }
3490
3491 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3492
3493 /*
3494  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3495  * since we don't need to filter out obsolete ops as this is
3496  * done in the decoding phase.
3497  */
3498 static nfsd4_enc nfsd4_enc_ops[] = {
3499         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3500         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3501         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3502         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3503         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3504         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3505         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3506         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3507         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3508         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3509         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3510         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3511         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3512         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3513         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3514         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3515         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3516         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3517         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3518         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3519         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3520         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3521         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3522         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3523         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3524         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3525         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3526         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3527         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3528         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3529         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3530         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3531         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3532         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3533         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3534         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3535         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3536
3537         /* NFSv4.1 operations */
3538         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3539         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3540         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3541         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3542         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
3543         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3544         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3545         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3546         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3547         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3548         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3549         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3550         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3551         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3552         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3553         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3554         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3555         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3556         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3557 };
3558
3559 /*
3560  * Calculate the total amount of memory that the compound response has taken
3561  * after encoding the current operation with pad.
3562  *
3563  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3564  *      which was specified at nfsd4_operation, else pad is zero.
3565  *
3566  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3567  *
3568  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3569  * will be at least a page and will therefore hold the xdr_buf head.
3570  */
3571 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3572 {
3573         struct xdr_buf *xb = &resp->rqstp->rq_res;
3574         struct nfsd4_session *session = NULL;
3575         struct nfsd4_slot *slot = resp->cstate.slot;
3576         u32 length, tlen = 0;
3577
3578         if (!nfsd4_has_session(&resp->cstate))
3579                 return 0;
3580
3581         session = resp->cstate.session;
3582         if (session == NULL)
3583                 return 0;
3584
3585         if (xb->page_len == 0) {
3586                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3587         } else {
3588                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3589                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3590
3591                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3592         }
3593         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3594                 length, xb->page_len, tlen, pad);
3595
3596         if (length > session->se_fchannel.maxresp_sz)
3597                 return nfserr_rep_too_big;
3598
3599         if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3600             length > session->se_fchannel.maxresp_cached)
3601                 return nfserr_rep_too_big_to_cache;
3602
3603         return 0;
3604 }
3605
3606 void
3607 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3608 {
3609         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3610         __be32 *statp;
3611         __be32 *p;
3612
3613         RESERVE_SPACE(8);
3614         WRITE32(op->opnum);
3615         statp = p++;    /* to be backfilled at the end */
3616         ADJUST_ARGS();
3617
3618         if (op->opnum == OP_ILLEGAL)
3619                 goto status;
3620         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3621                !nfsd4_enc_ops[op->opnum]);
3622         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3623         /* nfsd4_check_drc_limit guarantees enough room for error status */
3624         if (!op->status)
3625                 op->status = nfsd4_check_resp_size(resp, 0);
3626         if (so) {
3627                 so->so_replay.rp_status = op->status;
3628                 so->so_replay.rp_buflen = (char *)resp->p - (char *)(statp+1);
3629                 memcpy(so->so_replay.rp_buf, statp+1, so->so_replay.rp_buflen);
3630         }
3631 status:
3632         /*
3633          * Note: We write the status directly, instead of using WRITE32(),
3634          * since it is already in network byte order.
3635          */
3636         *statp = op->status;
3637 }
3638
3639 /*
3640  * Encode the reply stored in the stateowner reply cache
3641  *
3642  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3643  * previously sent already encoded operation.
3644  *
3645  * called with nfs4_lock_state() held
3646  */
3647 void
3648 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3649 {
3650         __be32 *p;
3651         struct nfs4_replay *rp = op->replay;
3652
3653         BUG_ON(!rp);
3654
3655         RESERVE_SPACE(8);
3656         WRITE32(op->opnum);
3657         *p++ = rp->rp_status;  /* already xdr'ed */
3658         ADJUST_ARGS();
3659
3660         RESERVE_SPACE(rp->rp_buflen);
3661         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3662         ADJUST_ARGS();
3663 }
3664
3665 int
3666 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3667 {
3668         return xdr_ressize_check(rqstp, p);
3669 }
3670
3671 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3672 {
3673         struct svc_rqst *rqstp = rq;
3674         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3675
3676         if (args->ops != args->iops) {
3677                 kfree(args->ops);
3678                 args->ops = args->iops;
3679         }
3680         kfree(args->tmpp);
3681         args->tmpp = NULL;
3682         while (args->to_free) {
3683                 struct tmpbuf *tb = args->to_free;
3684                 args->to_free = tb->next;
3685                 tb->release(tb->buf);
3686                 kfree(tb);
3687         }
3688         return 1;
3689 }
3690
3691 int
3692 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3693 {
3694         args->p = p;
3695         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3696         args->pagelist = rqstp->rq_arg.pages;
3697         args->pagelen = rqstp->rq_arg.page_len;
3698         args->tmpp = NULL;
3699         args->to_free = NULL;
3700         args->ops = args->iops;
3701         args->rqstp = rqstp;
3702
3703         return !nfsd4_decode_compound(args);
3704 }
3705
3706 int
3707 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3708 {
3709         /*
3710          * All that remains is to write the tag and operation count...
3711          */
3712         struct nfsd4_compound_state *cs = &resp->cstate;
3713         struct kvec *iov;
3714         p = resp->tagp;
3715         *p++ = htonl(resp->taglen);
3716         memcpy(p, resp->tag, resp->taglen);
3717         p += XDR_QUADLEN(resp->taglen);
3718         *p++ = htonl(resp->opcnt);
3719
3720         if (rqstp->rq_res.page_len)
3721                 iov = &rqstp->rq_res.tail[0];
3722         else
3723                 iov = &rqstp->rq_res.head[0];
3724         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3725         BUG_ON(iov->iov_len > PAGE_SIZE);
3726         if (nfsd4_has_session(cs)) {
3727                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3728                 struct nfs4_client *clp = cs->session->se_client;
3729                 if (cs->status != nfserr_replay_cache) {
3730                         nfsd4_store_cache_entry(resp);
3731                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3732                 }
3733                 /* Renew the clientid on success and on replay */
3734                 spin_lock(&nn->client_lock);
3735                 nfsd4_put_session(cs->session);
3736                 spin_unlock(&nn->client_lock);
3737                 put_client_renew(clp);
3738         }
3739         return 1;
3740 }
3741
3742 /*
3743  * Local variables:
3744  *  c-basic-offset: 8
3745  * End:
3746  */