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_fbig;
 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);
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         write->wr_pagelist = argp->pagelist;
1226
1227         len = XDR_QUADLEN(write->wr_buflen) << 2;
1228         if (len >= avail) {
1229                 int pages;
1230
1231                 len -= avail;
1232
1233                 pages = len >> PAGE_SHIFT;
1234                 argp->pagelist += pages;
1235                 argp->pagelen -= pages * PAGE_SIZE;
1236                 len -= pages * PAGE_SIZE;
1237
1238                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1239                 argp->pagelist++;
1240                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1241         }
1242         argp->p += XDR_QUADLEN(len);
1243
1244         DECODE_TAIL;
1245 }
1246
1247 static __be32
1248 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1249 {
1250         DECODE_HEAD;
1251
1252         if (argp->minorversion >= 1)
1253                 return nfserr_notsupp;
1254
1255         READ_BUF(12);
1256         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1257         READ32(rlockowner->rl_owner.len);
1258         READ_BUF(rlockowner->rl_owner.len);
1259         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1260
1261         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1262                 return nfserr_inval;
1263         DECODE_TAIL;
1264 }
1265
1266 static __be32
1267 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1268                          struct nfsd4_exchange_id *exid)
1269 {
1270         int dummy, tmp;
1271         DECODE_HEAD;
1272
1273         READ_BUF(NFS4_VERIFIER_SIZE);
1274         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1275
1276         status = nfsd4_decode_opaque(argp, &exid->clname);
1277         if (status)
1278                 return nfserr_bad_xdr;
1279
1280         READ_BUF(4);
1281         READ32(exid->flags);
1282
1283         /* Ignore state_protect4_a */
1284         READ_BUF(4);
1285         READ32(exid->spa_how);
1286         switch (exid->spa_how) {
1287         case SP4_NONE:
1288                 break;
1289         case SP4_MACH_CRED:
1290                 /* spo_must_enforce */
1291                 READ_BUF(4);
1292                 READ32(dummy);
1293                 READ_BUF(dummy * 4);
1294                 p += dummy;
1295
1296                 /* spo_must_allow */
1297                 READ_BUF(4);
1298                 READ32(dummy);
1299                 READ_BUF(dummy * 4);
1300                 p += dummy;
1301                 break;
1302         case SP4_SSV:
1303                 /* ssp_ops */
1304                 READ_BUF(4);
1305                 READ32(dummy);
1306                 READ_BUF(dummy * 4);
1307                 p += dummy;
1308
1309                 READ_BUF(4);
1310                 READ32(dummy);
1311                 READ_BUF(dummy * 4);
1312                 p += dummy;
1313
1314                 /* ssp_hash_algs<> */
1315                 READ_BUF(4);
1316                 READ32(tmp);
1317                 while (tmp--) {
1318                         READ_BUF(4);
1319                         READ32(dummy);
1320                         READ_BUF(dummy);
1321                         p += XDR_QUADLEN(dummy);
1322                 }
1323
1324                 /* ssp_encr_algs<> */
1325                 READ_BUF(4);
1326                 READ32(tmp);
1327                 while (tmp--) {
1328                         READ_BUF(4);
1329                         READ32(dummy);
1330                         READ_BUF(dummy);
1331                         p += XDR_QUADLEN(dummy);
1332                 }
1333
1334                 /* ssp_window and ssp_num_gss_handles */
1335                 READ_BUF(8);
1336                 READ32(dummy);
1337                 READ32(dummy);
1338                 break;
1339         default:
1340                 goto xdr_error;
1341         }
1342
1343         /* Ignore Implementation ID */
1344         READ_BUF(4);    /* nfs_impl_id4 array length */
1345         READ32(dummy);
1346
1347         if (dummy > 1)
1348                 goto xdr_error;
1349
1350         if (dummy == 1) {
1351                 /* nii_domain */
1352                 READ_BUF(4);
1353                 READ32(dummy);
1354                 READ_BUF(dummy);
1355                 p += XDR_QUADLEN(dummy);
1356
1357                 /* nii_name */
1358                 READ_BUF(4);
1359                 READ32(dummy);
1360                 READ_BUF(dummy);
1361                 p += XDR_QUADLEN(dummy);
1362
1363                 /* nii_date */
1364                 READ_BUF(12);
1365                 p += 3;
1366         }
1367         DECODE_TAIL;
1368 }
1369
1370 static __be32
1371 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1372                             struct nfsd4_create_session *sess)
1373 {
1374         DECODE_HEAD;
1375         u32 dummy;
1376
1377         READ_BUF(16);
1378         COPYMEM(&sess->clientid, 8);
1379         READ32(sess->seqid);
1380         READ32(sess->flags);
1381
1382         /* Fore channel attrs */
1383         READ_BUF(28);
1384         READ32(dummy); /* headerpadsz is always 0 */
1385         READ32(sess->fore_channel.maxreq_sz);
1386         READ32(sess->fore_channel.maxresp_sz);
1387         READ32(sess->fore_channel.maxresp_cached);
1388         READ32(sess->fore_channel.maxops);
1389         READ32(sess->fore_channel.maxreqs);
1390         READ32(sess->fore_channel.nr_rdma_attrs);
1391         if (sess->fore_channel.nr_rdma_attrs == 1) {
1392                 READ_BUF(4);
1393                 READ32(sess->fore_channel.rdma_attrs);
1394         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1395                 dprintk("Too many fore channel attr bitmaps!\n");
1396                 goto xdr_error;
1397         }
1398
1399         /* Back channel attrs */
1400         READ_BUF(28);
1401         READ32(dummy); /* headerpadsz is always 0 */
1402         READ32(sess->back_channel.maxreq_sz);
1403         READ32(sess->back_channel.maxresp_sz);
1404         READ32(sess->back_channel.maxresp_cached);
1405         READ32(sess->back_channel.maxops);
1406         READ32(sess->back_channel.maxreqs);
1407         READ32(sess->back_channel.nr_rdma_attrs);
1408         if (sess->back_channel.nr_rdma_attrs == 1) {
1409                 READ_BUF(4);
1410                 READ32(sess->back_channel.rdma_attrs);
1411         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1412                 dprintk("Too many back channel attr bitmaps!\n");
1413                 goto xdr_error;
1414         }
1415
1416         READ_BUF(4);
1417         READ32(sess->callback_prog);
1418         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1419         DECODE_TAIL;
1420 }
1421
1422 static __be32
1423 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1424                              struct nfsd4_destroy_session *destroy_session)
1425 {
1426         DECODE_HEAD;
1427         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1428         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1429
1430         DECODE_TAIL;
1431 }
1432
1433 static __be32
1434 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1435                           struct nfsd4_free_stateid *free_stateid)
1436 {
1437         DECODE_HEAD;
1438
1439         READ_BUF(sizeof(stateid_t));
1440         READ32(free_stateid->fr_stateid.si_generation);
1441         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1442
1443         DECODE_TAIL;
1444 }
1445
1446 static __be32
1447 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1448                       struct nfsd4_sequence *seq)
1449 {
1450         DECODE_HEAD;
1451
1452         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1453         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1454         READ32(seq->seqid);
1455         READ32(seq->slotid);
1456         READ32(seq->maxslots);
1457         READ32(seq->cachethis);
1458
1459         DECODE_TAIL;
1460 }
1461
1462 static __be32
1463 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1464 {
1465         int i;
1466         __be32 *p, status;
1467         struct nfsd4_test_stateid_id *stateid;
1468
1469         READ_BUF(4);
1470         test_stateid->ts_num_ids = ntohl(*p++);
1471
1472         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1473
1474         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1475                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1476                 if (!stateid) {
1477                         status = nfserrno(-ENOMEM);
1478                         goto out;
1479                 }
1480
1481                 defer_free(argp, kfree, stateid);
1482                 INIT_LIST_HEAD(&stateid->ts_id_list);
1483                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1484
1485                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1486                 if (status)
1487                         goto out;
1488         }
1489
1490         status = 0;
1491 out:
1492         return status;
1493 xdr_error:
1494         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1495         status = nfserr_bad_xdr;
1496         goto out;
1497 }
1498
1499 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1500 {
1501         DECODE_HEAD;
1502
1503         READ_BUF(8);
1504         COPYMEM(&dc->clientid, 8);
1505
1506         DECODE_TAIL;
1507 }
1508
1509 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1510 {
1511         DECODE_HEAD;
1512
1513         READ_BUF(4);
1514         READ32(rc->rca_one_fs);
1515
1516         DECODE_TAIL;
1517 }
1518
1519 static __be32
1520 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1521 {
1522         return nfs_ok;
1523 }
1524
1525 static __be32
1526 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1527 {
1528         return nfserr_notsupp;
1529 }
1530
1531 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1532
1533 static nfsd4_dec nfsd4_dec_ops[] = {
1534         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1535         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1536         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1537         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1538         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1539         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1540         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1541         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1542         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1543         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1544         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1545         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1546         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1547         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1548         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1549         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1550         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1551         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1552         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1553         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1554         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1555         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1556         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1557         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1558         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1559         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1560         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1561         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1562         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1563         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1564         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1565         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1566         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1567         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1568         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1569         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1570         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1571
1572         /* new operations for NFSv4.1 */
1573         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1574         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1575         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1576         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1577         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1578         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1579         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1580         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1581         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1582         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1583         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1584         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1585         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1586         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1587         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1588         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1589         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1590         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1591         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1592 };
1593
1594 static inline bool
1595 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1596 {
1597         if (op->opnum < FIRST_NFS4_OP)
1598                 return false;
1599         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1600                 return false;
1601         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1602                 return false;
1603         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1604                 return false;
1605         return true;
1606 }
1607
1608 static __be32
1609 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1610 {
1611         DECODE_HEAD;
1612         struct nfsd4_op *op;
1613         bool cachethis = false;
1614         int max_reply = 2 * RPC_MAX_AUTH_SIZE + 8; /* opcnt, status */
1615         int readcount = 0;
1616         int readbytes = 0;
1617         int i;
1618
1619         READ_BUF(4);
1620         READ32(argp->taglen);
1621         READ_BUF(argp->taglen + 8);
1622         SAVEMEM(argp->tag, argp->taglen);
1623         READ32(argp->minorversion);
1624         READ32(argp->opcnt);
1625         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1626
1627         if (argp->taglen > NFSD4_MAX_TAGLEN)
1628                 goto xdr_error;
1629         if (argp->opcnt > 100)
1630                 goto xdr_error;
1631
1632         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1633                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1634                 if (!argp->ops) {
1635                         argp->ops = argp->iops;
1636                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1637                         goto xdr_error;
1638                 }
1639         }
1640
1641         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1642                 argp->opcnt = 0;
1643
1644         for (i = 0; i < argp->opcnt; i++) {
1645                 op = &argp->ops[i];
1646                 op->replay = NULL;
1647
1648                 READ_BUF(4);
1649                 READ32(op->opnum);
1650
1651                 if (nfsd4_opnum_in_range(argp, op))
1652                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1653                 else {
1654                         op->opnum = OP_ILLEGAL;
1655                         op->status = nfserr_op_illegal;
1656                 }
1657                 /*
1658                  * We'll try to cache the result in the DRC if any one
1659                  * op in the compound wants to be cached:
1660                  */
1661                 cachethis |= nfsd4_cache_this_op(op);
1662
1663                 if (op->opnum == OP_READ) {
1664                         readcount++;
1665                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1666                 } else
1667                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1668
1669                 if (op->status) {
1670                         argp->opcnt = i+1;
1671                         break;
1672                 }
1673         }
1674         /* Sessions make the DRC unnecessary: */
1675         if (argp->minorversion)
1676                 cachethis = false;
1677         svc_reserve(argp->rqstp, max_reply + readbytes);
1678         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1679
1680         if (readcount > 1 || max_reply > PAGE_SIZE - 2*RPC_MAX_AUTH_SIZE)
1681                 argp->rqstp->rq_splice_ok = false;
1682
1683         DECODE_TAIL;
1684 }
1685
1686 static void write32(__be32 **p, u32 n)
1687 {
1688         *(*p)++ = htonl(n);
1689 }
1690
1691 static void write64(__be32 **p, u64 n)
1692 {
1693         write32(p, (n >> 32));
1694         write32(p, (u32)n);
1695 }
1696
1697 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1698 {
1699         if (IS_I_VERSION(inode)) {
1700                 write64(p, inode->i_version);
1701         } else {
1702                 write32(p, stat->ctime.tv_sec);
1703                 write32(p, stat->ctime.tv_nsec);
1704         }
1705 }
1706
1707 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1708 {
1709         write32(p, c->atomic);
1710         if (c->change_supported) {
1711                 write64(p, c->before_change);
1712                 write64(p, c->after_change);
1713         } else {
1714                 write32(p, c->before_ctime_sec);
1715                 write32(p, c->before_ctime_nsec);
1716                 write32(p, c->after_ctime_sec);
1717                 write32(p, c->after_ctime_nsec);
1718         }
1719 }
1720
1721 /* Encode as an array of strings the string given with components
1722  * separated @sep, escaped with esc_enter and esc_exit.
1723  */
1724 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1725                                           char *components, char esc_enter,
1726                                           char esc_exit)
1727 {
1728         __be32 *p;
1729         __be32 pathlen;
1730         int pathlen_offset;
1731         int strlen, count=0;
1732         char *str, *end, *next;
1733
1734         dprintk("nfsd4_encode_components(%s)\n", components);
1735
1736         pathlen_offset = xdr->buf->len;
1737         p = xdr_reserve_space(xdr, 4);
1738         if (!p)
1739                 return nfserr_resource;
1740         p++; /* We will fill this in with @count later */
1741
1742         end = str = components;
1743         while (*end) {
1744                 bool found_esc = false;
1745
1746                 /* try to parse as esc_start, ..., esc_end, sep */
1747                 if (*str == esc_enter) {
1748                         for (; *end && (*end != esc_exit); end++)
1749                                 /* find esc_exit or end of string */;
1750                         next = end + 1;
1751                         if (*end && (!*next || *next == sep)) {
1752                                 str++;
1753                                 found_esc = true;
1754                         }
1755                 }
1756
1757                 if (!found_esc)
1758                         for (; *end && (*end != sep); end++)
1759                                 /* find sep or end of string */;
1760
1761                 strlen = end - str;
1762                 if (strlen) {
1763                         p = xdr_reserve_space(xdr, strlen + 4);
1764                         if (!p)
1765                                 return nfserr_resource;
1766                         p = xdr_encode_opaque(p, str, strlen);
1767                         count++;
1768                 }
1769                 else
1770                         end++;
1771                 str = end;
1772         }
1773         pathlen = htonl(xdr->buf->len - pathlen_offset);
1774         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1775         return 0;
1776 }
1777
1778 /* Encode as an array of strings the string given with components
1779  * separated @sep.
1780  */
1781 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1782                                       char *components)
1783 {
1784         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1785 }
1786
1787 /*
1788  * encode a location element of a fs_locations structure
1789  */
1790 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1791                                         struct nfsd4_fs_location *location)
1792 {
1793         __be32 status;
1794
1795         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1796                                                 '[', ']');
1797         if (status)
1798                 return status;
1799         status = nfsd4_encode_components(xdr, '/', location->path);
1800         if (status)
1801                 return status;
1802         return 0;
1803 }
1804
1805 /*
1806  * Encode a path in RFC3530 'pathname4' format
1807  */
1808 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
1809                                 const struct path *root,
1810                                 const struct path *path)
1811 {
1812         struct path cur = *path;
1813         __be32 *p;
1814         struct dentry **components = NULL;
1815         unsigned int ncomponents = 0;
1816         __be32 err = nfserr_jukebox;
1817
1818         dprintk("nfsd4_encode_components(");
1819
1820         path_get(&cur);
1821         /* First walk the path up to the nfsd root, and store the
1822          * dentries/path components in an array.
1823          */
1824         for (;;) {
1825                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1826                         break;
1827                 if (cur.dentry == cur.mnt->mnt_root) {
1828                         if (follow_up(&cur))
1829                                 continue;
1830                         goto out_free;
1831                 }
1832                 if ((ncomponents & 15) == 0) {
1833                         struct dentry **new;
1834                         new = krealloc(components,
1835                                         sizeof(*new) * (ncomponents + 16),
1836                                         GFP_KERNEL);
1837                         if (!new)
1838                                 goto out_free;
1839                         components = new;
1840                 }
1841                 components[ncomponents++] = cur.dentry;
1842                 cur.dentry = dget_parent(cur.dentry);
1843         }
1844         err = nfserr_resource;
1845         p = xdr_reserve_space(xdr, 4);
1846         if (!p)
1847                 goto out_free;
1848         *p++ = cpu_to_be32(ncomponents);
1849
1850         while (ncomponents) {
1851                 struct dentry *dentry = components[ncomponents - 1];
1852                 unsigned int len;
1853
1854                 spin_lock(&dentry->d_lock);
1855                 len = dentry->d_name.len;
1856                 p = xdr_reserve_space(xdr, len + 4);
1857                 if (!p) {
1858                         spin_unlock(&dentry->d_lock);
1859                         goto out_free;
1860                 }
1861                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
1862                 dprintk("/%s", dentry->d_name.name);
1863                 spin_unlock(&dentry->d_lock);
1864                 dput(dentry);
1865                 ncomponents--;
1866         }
1867
1868         err = 0;
1869 out_free:
1870         dprintk(")\n");
1871         while (ncomponents)
1872                 dput(components[--ncomponents]);
1873         kfree(components);
1874         path_put(&cur);
1875         return err;
1876 }
1877
1878 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
1879                         struct svc_rqst *rqstp, const struct path *path)
1880 {
1881         struct svc_export *exp_ps;
1882         __be32 res;
1883
1884         exp_ps = rqst_find_fsidzero_export(rqstp);
1885         if (IS_ERR(exp_ps))
1886                 return nfserrno(PTR_ERR(exp_ps));
1887         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
1888         exp_put(exp_ps);
1889         return res;
1890 }
1891
1892 /*
1893  *  encode a fs_locations structure
1894  */
1895 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
1896                         struct svc_rqst *rqstp, struct svc_export *exp)
1897 {
1898         __be32 status;
1899         int i;
1900         __be32 *p;
1901         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1902
1903         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1904         if (status)
1905                 return status;
1906         p = xdr_reserve_space(xdr, 4);
1907         if (!p)
1908                 return nfserr_resource;
1909         *p++ = cpu_to_be32(fslocs->locations_count);
1910         for (i=0; i<fslocs->locations_count; i++) {
1911                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1912                 if (status)
1913                         return status;
1914         }
1915         return 0;
1916 }
1917
1918 static u32 nfs4_file_type(umode_t mode)
1919 {
1920         switch (mode & S_IFMT) {
1921         case S_IFIFO:   return NF4FIFO;
1922         case S_IFCHR:   return NF4CHR;
1923         case S_IFDIR:   return NF4DIR;
1924         case S_IFBLK:   return NF4BLK;
1925         case S_IFLNK:   return NF4LNK;
1926         case S_IFREG:   return NF4REG;
1927         case S_IFSOCK:  return NF4SOCK;
1928         default:        return NF4BAD;
1929         };
1930 }
1931
1932 static inline __be32
1933 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1934                      struct nfs4_ace *ace)
1935 {
1936         if (ace->whotype != NFS4_ACL_WHO_NAMED)
1937                 return nfs4_acl_write_who(xdr, ace->whotype);
1938         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1939                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1940         else
1941                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1942 }
1943
1944 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1945                               FATTR4_WORD0_RDATTR_ERROR)
1946 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1947
1948 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1949 static inline __be32
1950 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1951                             void *context, int len)
1952 {
1953         __be32 *p;
1954
1955         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
1956         if (!p)
1957                 return nfserr_resource;
1958
1959         /*
1960          * For now we use a 0 here to indicate the null translation; in
1961          * the future we may place a call to translation code here.
1962          */
1963         *p++ = cpu_to_be32(0); /* lfs */
1964         *p++ = cpu_to_be32(0); /* pi */
1965         p = xdr_encode_opaque(p, context, len);
1966         return 0;
1967 }
1968 #else
1969 static inline __be32
1970 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1971                             void *context, int len)
1972 { return 0; }
1973 #endif
1974
1975 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1976 {
1977         /* As per referral draft:  */
1978         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1979             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1980                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1981                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1982                         *rdattr_err = NFSERR_MOVED;
1983                 else
1984                         return nfserr_moved;
1985         }
1986         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1987         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1988         return 0;
1989 }
1990
1991
1992 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
1993 {
1994         struct path path = exp->ex_path;
1995         int err;
1996
1997         path_get(&path);
1998         while (follow_up(&path)) {
1999                 if (path.dentry != path.mnt->mnt_root)
2000                         break;
2001         }
2002         err = vfs_getattr(&path, stat);
2003         path_put(&path);
2004         return err;
2005 }
2006
2007 /*
2008  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2009  * ourselves.
2010  */
2011 __be32
2012 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2013                 struct svc_export *exp,
2014                 struct dentry *dentry, u32 *bmval,
2015                 struct svc_rqst *rqstp, int ignore_crossmnt)
2016 {
2017         u32 bmval0 = bmval[0];
2018         u32 bmval1 = bmval[1];
2019         u32 bmval2 = bmval[2];
2020         struct kstat stat;
2021         struct svc_fh *tempfh = NULL;
2022         struct kstatfs statfs;
2023         __be32 *p;
2024         int starting_len = xdr->buf->len;
2025         int attrlen_offset;
2026         __be32 attrlen;
2027         u32 dummy;
2028         u64 dummy64;
2029         u32 rdattr_err = 0;
2030         __be32 status;
2031         int err;
2032         int aclsupport = 0;
2033         struct nfs4_acl *acl = NULL;
2034         void *context = NULL;
2035         int contextlen;
2036         bool contextsupport = false;
2037         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2038         u32 minorversion = resp->cstate.minorversion;
2039         struct path path = {
2040                 .mnt    = exp->ex_path.mnt,
2041                 .dentry = dentry,
2042         };
2043         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2044
2045         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2046         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2047         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2048         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2049
2050         if (exp->ex_fslocs.migrated) {
2051                 BUG_ON(bmval[2]);
2052                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2053                 if (status)
2054                         goto out;
2055         }
2056
2057         err = vfs_getattr(&path, &stat);
2058         if (err)
2059                 goto out_nfserr;
2060         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2061                         FATTR4_WORD0_MAXNAME)) ||
2062             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2063                        FATTR4_WORD1_SPACE_TOTAL))) {
2064                 err = vfs_statfs(&path, &statfs);
2065                 if (err)
2066                         goto out_nfserr;
2067         }
2068         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2069                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2070                 status = nfserr_jukebox;
2071                 if (!tempfh)
2072                         goto out;
2073                 fh_init(tempfh, NFS4_FHSIZE);
2074                 status = fh_compose(tempfh, exp, dentry, NULL);
2075                 if (status)
2076                         goto out;
2077                 fhp = tempfh;
2078         }
2079         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2080                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2081                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2082                 aclsupport = (err == 0);
2083                 if (bmval0 & FATTR4_WORD0_ACL) {
2084                         if (err == -EOPNOTSUPP)
2085                                 bmval0 &= ~FATTR4_WORD0_ACL;
2086                         else if (err == -EINVAL) {
2087                                 status = nfserr_attrnotsupp;
2088                                 goto out;
2089                         } else if (err != 0)
2090                                 goto out_nfserr;
2091                 }
2092         }
2093
2094 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2095         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2096                         bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2097                 err = security_inode_getsecctx(dentry->d_inode,
2098                                                 &context, &contextlen);
2099                 contextsupport = (err == 0);
2100                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2101                         if (err == -EOPNOTSUPP)
2102                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2103                         else if (err)
2104                                 goto out_nfserr;
2105                 }
2106         }
2107 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2108
2109         if (bmval2) {
2110                 p = xdr_reserve_space(xdr, 16);
2111                 if (!p)
2112                         goto out_resource;
2113                 *p++ = cpu_to_be32(3);
2114                 *p++ = cpu_to_be32(bmval0);
2115                 *p++ = cpu_to_be32(bmval1);
2116                 *p++ = cpu_to_be32(bmval2);
2117         } else if (bmval1) {
2118                 p = xdr_reserve_space(xdr, 12);
2119                 if (!p)
2120                         goto out_resource;
2121                 *p++ = cpu_to_be32(2);
2122                 *p++ = cpu_to_be32(bmval0);
2123                 *p++ = cpu_to_be32(bmval1);
2124         } else {
2125                 p = xdr_reserve_space(xdr, 8);
2126                 if (!p)
2127                         goto out_resource;
2128                 *p++ = cpu_to_be32(1);
2129                 *p++ = cpu_to_be32(bmval0);
2130         }
2131
2132         attrlen_offset = xdr->buf->len;
2133         p = xdr_reserve_space(xdr, 4);
2134         if (!p)
2135                 goto out_resource;
2136         p++;                /* to be backfilled later */
2137
2138         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2139                 u32 word0 = nfsd_suppattrs0(minorversion);
2140                 u32 word1 = nfsd_suppattrs1(minorversion);
2141                 u32 word2 = nfsd_suppattrs2(minorversion);
2142
2143                 if (!aclsupport)
2144                         word0 &= ~FATTR4_WORD0_ACL;
2145                 if (!contextsupport)
2146                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2147                 if (!word2) {
2148                         p = xdr_reserve_space(xdr, 12);
2149                         if (!p)
2150                                 goto out_resource;
2151                         *p++ = cpu_to_be32(2);
2152                         *p++ = cpu_to_be32(word0);
2153                         *p++ = cpu_to_be32(word1);
2154                 } else {
2155                         p = xdr_reserve_space(xdr, 16);
2156                         if (!p)
2157                                 goto out_resource;
2158                         *p++ = cpu_to_be32(3);
2159                         *p++ = cpu_to_be32(word0);
2160                         *p++ = cpu_to_be32(word1);
2161                         *p++ = cpu_to_be32(word2);
2162                 }
2163         }
2164         if (bmval0 & FATTR4_WORD0_TYPE) {
2165                 p = xdr_reserve_space(xdr, 4);
2166                 if (!p)
2167                         goto out_resource;
2168                 dummy = nfs4_file_type(stat.mode);
2169                 if (dummy == NF4BAD) {
2170                         status = nfserr_serverfault;
2171                         goto out;
2172                 }
2173                 *p++ = cpu_to_be32(dummy);
2174         }
2175         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2176                 p = xdr_reserve_space(xdr, 4);
2177                 if (!p)
2178                         goto out_resource;
2179                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2180                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2181                 else
2182                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2183                                                 NFS4_FH_VOL_RENAME);
2184         }
2185         if (bmval0 & FATTR4_WORD0_CHANGE) {
2186                 p = xdr_reserve_space(xdr, 8);
2187                 if (!p)
2188                         goto out_resource;
2189                 write_change(&p, &stat, dentry->d_inode);
2190         }
2191         if (bmval0 & FATTR4_WORD0_SIZE) {
2192                 p = xdr_reserve_space(xdr, 8);
2193                 if (!p)
2194                         goto out_resource;
2195                 p = xdr_encode_hyper(p, stat.size);
2196         }
2197         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2198                 p = xdr_reserve_space(xdr, 4);
2199                 if (!p)
2200                         goto out_resource;
2201                 *p++ = cpu_to_be32(1);
2202         }
2203         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2204                 p = xdr_reserve_space(xdr, 4);
2205                 if (!p)
2206                         goto out_resource;
2207                 *p++ = cpu_to_be32(1);
2208         }
2209         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2210                 p = xdr_reserve_space(xdr, 4);
2211                 if (!p)
2212                         goto out_resource;
2213                 *p++ = cpu_to_be32(0);
2214         }
2215         if (bmval0 & FATTR4_WORD0_FSID) {
2216                 p = xdr_reserve_space(xdr, 16);
2217                 if (!p)
2218                         goto out_resource;
2219                 if (exp->ex_fslocs.migrated) {
2220                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2221                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2222                 } else switch(fsid_source(fhp)) {
2223                 case FSIDSOURCE_FSID:
2224                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2225                         p = xdr_encode_hyper(p, (u64)0);
2226                         break;
2227                 case FSIDSOURCE_DEV:
2228                         *p++ = cpu_to_be32(0);
2229                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2230                         *p++ = cpu_to_be32(0);
2231                         *p++ = cpu_to_be32(MINOR(stat.dev));
2232                         break;
2233                 case FSIDSOURCE_UUID:
2234                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid, 16);
2235                         break;
2236                 }
2237         }
2238         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2239                 p = xdr_reserve_space(xdr, 4);
2240                 if (!p)
2241                         goto out_resource;
2242                 *p++ = cpu_to_be32(0);
2243         }
2244         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2245                 p = xdr_reserve_space(xdr, 4);
2246                 if (!p)
2247                         goto out_resource;
2248                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2249         }
2250         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2251                 p = xdr_reserve_space(xdr, 4);
2252                 if (!p)
2253                         goto out_resource;
2254                 *p++ = cpu_to_be32(rdattr_err);
2255         }
2256         if (bmval0 & FATTR4_WORD0_ACL) {
2257                 struct nfs4_ace *ace;
2258
2259                 if (acl == NULL) {
2260                         p = xdr_reserve_space(xdr, 4);
2261                         if (!p)
2262                                 goto out_resource;
2263
2264                         *p++ = cpu_to_be32(0);
2265                         goto out_acl;
2266                 }
2267                 p = xdr_reserve_space(xdr, 4);
2268                 if (!p)
2269                         goto out_resource;
2270                 *p++ = cpu_to_be32(acl->naces);
2271
2272                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2273                         p = xdr_reserve_space(xdr, 4*3);
2274                         if (!p)
2275                                 goto out_resource;
2276                         *p++ = cpu_to_be32(ace->type);
2277                         *p++ = cpu_to_be32(ace->flag);
2278                         *p++ = cpu_to_be32(ace->access_mask &
2279                                                         NFS4_ACE_MASK_ALL);
2280                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2281                         if (status)
2282                                 goto out;
2283                 }
2284         }
2285 out_acl:
2286         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2287                 p = xdr_reserve_space(xdr, 4);
2288                 if (!p)
2289                         goto out_resource;
2290                 *p++ = cpu_to_be32(aclsupport ?
2291                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2292         }
2293         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2294                 p = xdr_reserve_space(xdr, 4);
2295                 if (!p)
2296                         goto out_resource;
2297                 *p++ = cpu_to_be32(1);
2298         }
2299         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2300                 p = xdr_reserve_space(xdr, 4);
2301                 if (!p)
2302                         goto out_resource;
2303                 *p++ = cpu_to_be32(0);
2304         }
2305         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2306                 p = xdr_reserve_space(xdr, 4);
2307                 if (!p)
2308                         goto out_resource;
2309                 *p++ = cpu_to_be32(1);
2310         }
2311         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2312                 p = xdr_reserve_space(xdr, 4);
2313                 if (!p)
2314                         goto out_resource;
2315                 *p++ = cpu_to_be32(1);
2316         }
2317         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2318                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2319                 if (!p)
2320                         goto out_resource;
2321                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2322                                         fhp->fh_handle.fh_size);
2323         }
2324         if (bmval0 & FATTR4_WORD0_FILEID) {
2325                 p = xdr_reserve_space(xdr, 8);
2326                 if (!p)
2327                         goto out_resource;
2328                 p = xdr_encode_hyper(p, stat.ino);
2329         }
2330         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2331                 p = xdr_reserve_space(xdr, 8);
2332                 if (!p)
2333                         goto out_resource;
2334                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2335         }
2336         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2337                 p = xdr_reserve_space(xdr, 8);
2338                 if (!p)
2339                         goto out_resource;
2340                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2341         }
2342         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2343                 p = xdr_reserve_space(xdr, 8);
2344                 if (!p)
2345                         goto out_resource;
2346                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2347         }
2348         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2349                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2350                 if (status)
2351                         goto out;
2352         }
2353         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2354                 p = xdr_reserve_space(xdr, 4);
2355                 if (!p)
2356                         goto out_resource;
2357                 *p++ = cpu_to_be32(1);
2358         }
2359         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2360                 p = xdr_reserve_space(xdr, 8);
2361                 if (!p)
2362                         goto out_resource;
2363                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2364         }
2365         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2366                 p = xdr_reserve_space(xdr, 4);
2367                 if (!p)
2368                         goto out_resource;
2369                 *p++ = cpu_to_be32(255);
2370         }
2371         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2372                 p = xdr_reserve_space(xdr, 4);
2373                 if (!p)
2374                         goto out_resource;
2375                 *p++ = cpu_to_be32(statfs.f_namelen);
2376         }
2377         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2378                 p = xdr_reserve_space(xdr, 8);
2379                 if (!p)
2380                         goto out_resource;
2381                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2382         }
2383         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2384                 p = xdr_reserve_space(xdr, 8);
2385                 if (!p)
2386                         goto out_resource;
2387                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2388         }
2389         if (bmval1 & FATTR4_WORD1_MODE) {
2390                 p = xdr_reserve_space(xdr, 4);
2391                 if (!p)
2392                         goto out_resource;
2393                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2394         }
2395         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2396                 p = xdr_reserve_space(xdr, 4);
2397                 if (!p)
2398                         goto out_resource;
2399                 *p++ = cpu_to_be32(1);
2400         }
2401         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2402                 p = xdr_reserve_space(xdr, 4);
2403                 if (!p)
2404                         goto out_resource;
2405                 *p++ = cpu_to_be32(stat.nlink);
2406         }
2407         if (bmval1 & FATTR4_WORD1_OWNER) {
2408                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2409                 if (status)
2410                         goto out;
2411         }
2412         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2413                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2414                 if (status)
2415                         goto out;
2416         }
2417         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2418                 p = xdr_reserve_space(xdr, 8);
2419                 if (!p)
2420                         goto out_resource;
2421                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2422                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2423         }
2424         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2425                 p = xdr_reserve_space(xdr, 8);
2426                 if (!p)
2427                         goto out_resource;
2428                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2429                 p = xdr_encode_hyper(p, dummy64);
2430         }
2431         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2432                 p = xdr_reserve_space(xdr, 8);
2433                 if (!p)
2434                         goto out_resource;
2435                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2436                 p = xdr_encode_hyper(p, dummy64);
2437         }
2438         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2439                 p = xdr_reserve_space(xdr, 8);
2440                 if (!p)
2441                         goto out_resource;
2442                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2443                 p = xdr_encode_hyper(p, dummy64);
2444         }
2445         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2446                 p = xdr_reserve_space(xdr, 8);
2447                 if (!p)
2448                         goto out_resource;
2449                 dummy64 = (u64)stat.blocks << 9;
2450                 p = xdr_encode_hyper(p, dummy64);
2451         }
2452         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2453                 p = xdr_reserve_space(xdr, 12);
2454                 if (!p)
2455                         goto out_resource;
2456                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2457                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2458         }
2459         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2460                 p = xdr_reserve_space(xdr, 12);
2461                 if (!p)
2462                         goto out_resource;
2463                 *p++ = cpu_to_be32(0);
2464                 *p++ = cpu_to_be32(1);
2465                 *p++ = cpu_to_be32(0);
2466         }
2467         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2468                 p = xdr_reserve_space(xdr, 12);
2469                 if (!p)
2470                         goto out_resource;
2471                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2472                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2473         }
2474         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2475                 p = xdr_reserve_space(xdr, 12);
2476                 if (!p)
2477                         goto out_resource;
2478                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2479                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2480         }
2481         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2482                 p = xdr_reserve_space(xdr, 8);
2483                 if (!p)
2484                         goto out_resource;
2485                 /*
2486                  * Get parent's attributes if not ignoring crossmount
2487                  * and this is the root of a cross-mounted filesystem.
2488                  */
2489                 if (ignore_crossmnt == 0 &&
2490                     dentry == exp->ex_path.mnt->mnt_root)
2491                         get_parent_attributes(exp, &stat);
2492                 p = xdr_encode_hyper(p, stat.ino);
2493         }
2494         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2495                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2496                                                                 contextlen);
2497                 if (status)
2498                         goto out;
2499         }
2500         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2501                 p = xdr_reserve_space(xdr, 16);
2502                 if (!p)
2503                         goto out_resource;
2504                 *p++ = cpu_to_be32(3);
2505                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2506                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2507                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2508         }
2509
2510         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2511         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2512         status = nfs_ok;
2513
2514 out:
2515 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2516         if (context)
2517                 security_release_secctx(context, contextlen);
2518 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2519         kfree(acl);
2520         if (tempfh) {
2521                 fh_put(tempfh);
2522                 kfree(tempfh);
2523         }
2524         if (status)
2525                 xdr_truncate_encode(xdr, starting_len);
2526         return status;
2527 out_nfserr:
2528         status = nfserrno(err);
2529         goto out;
2530 out_resource:
2531         status = nfserr_resource;
2532         goto out;
2533 }
2534
2535 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2536                                 struct xdr_buf *buf, __be32 *p, int bytes)
2537 {
2538         xdr->scratch.iov_len = 0;
2539         memset(buf, 0, sizeof(struct xdr_buf));
2540         buf->head[0].iov_base = p;
2541         buf->head[0].iov_len = 0;
2542         buf->len = 0;
2543         xdr->buf = buf;
2544         xdr->iov = buf->head;
2545         xdr->p = p;
2546         xdr->end = (void *)p + bytes;
2547         buf->buflen = bytes;
2548 }
2549
2550 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2551                         struct svc_fh *fhp, struct svc_export *exp,
2552                         struct dentry *dentry, u32 *bmval,
2553                         struct svc_rqst *rqstp, int ignore_crossmnt)
2554 {
2555         struct xdr_buf dummy;
2556         struct xdr_stream xdr;
2557         __be32 ret;
2558
2559         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2560         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2561                                                         ignore_crossmnt);
2562         *p = xdr.p;
2563         return ret;
2564 }
2565
2566 static inline int attributes_need_mount(u32 *bmval)
2567 {
2568         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2569                 return 1;
2570         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2571                 return 1;
2572         return 0;
2573 }
2574
2575 static __be32
2576 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2577                         const char *name, int namlen)
2578 {
2579         struct svc_export *exp = cd->rd_fhp->fh_export;
2580         struct dentry *dentry;
2581         __be32 nfserr;
2582         int ignore_crossmnt = 0;
2583
2584         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2585         if (IS_ERR(dentry))
2586                 return nfserrno(PTR_ERR(dentry));
2587         if (!dentry->d_inode) {
2588                 /*
2589                  * nfsd_buffered_readdir drops the i_mutex between
2590                  * readdir and calling this callback, leaving a window
2591                  * where this directory entry could have gone away.
2592                  */
2593                 dput(dentry);
2594                 return nfserr_noent;
2595         }
2596
2597         exp_get(exp);
2598         /*
2599          * In the case of a mountpoint, the client may be asking for
2600          * attributes that are only properties of the underlying filesystem
2601          * as opposed to the cross-mounted file system. In such a case,
2602          * we will not follow the cross mount and will fill the attribtutes
2603          * directly from the mountpoint dentry.
2604          */
2605         if (nfsd_mountpoint(dentry, exp)) {
2606                 int err;
2607
2608                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2609                                 && !attributes_need_mount(cd->rd_bmval)) {
2610                         ignore_crossmnt = 1;
2611                         goto out_encode;
2612                 }
2613                 /*
2614                  * Why the heck aren't we just using nfsd_lookup??
2615                  * Different "."/".." handling?  Something else?
2616                  * At least, add a comment here to explain....
2617                  */
2618                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2619                 if (err) {
2620                         nfserr = nfserrno(err);
2621                         goto out_put;
2622                 }
2623                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2624                 if (nfserr)
2625                         goto out_put;
2626
2627         }
2628 out_encode:
2629         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2630                                         cd->rd_rqstp, ignore_crossmnt);
2631 out_put:
2632         dput(dentry);
2633         exp_put(exp);
2634         return nfserr;
2635 }
2636
2637 static __be32 *
2638 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2639 {
2640         __be32 *p;
2641
2642         p = xdr_reserve_space(xdr, 6);
2643         if (!p)
2644                 return NULL;
2645         *p++ = htonl(2);
2646         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2647         *p++ = htonl(0);                         /* bmval1 */
2648
2649         *p++ = htonl(4);     /* attribute length */
2650         *p++ = nfserr;       /* no htonl */
2651         return p;
2652 }
2653
2654 static int
2655 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2656                     loff_t offset, u64 ino, unsigned int d_type)
2657 {
2658         struct readdir_cd *ccd = ccdv;
2659         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2660         struct xdr_stream *xdr = cd->xdr;
2661         int start_offset = xdr->buf->len;
2662         int cookie_offset;
2663         int entry_bytes;
2664         __be32 nfserr = nfserr_toosmall;
2665         __be64 wire_offset;
2666         __be32 *p;
2667
2668         /* In nfsv4, "." and ".." never make it onto the wire.. */
2669         if (name && isdotent(name, namlen)) {
2670                 cd->common.err = nfs_ok;
2671                 return 0;
2672         }
2673
2674         if (cd->cookie_offset) {
2675                 wire_offset = cpu_to_be64(offset);
2676                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2677                                                         &wire_offset, 8);
2678         }
2679
2680         p = xdr_reserve_space(xdr, 4);
2681         if (!p)
2682                 goto fail;
2683         *p++ = xdr_one;                             /* mark entry present */
2684         cookie_offset = xdr->buf->len;
2685         p = xdr_reserve_space(xdr, 3*4 + namlen);
2686         if (!p)
2687                 goto fail;
2688         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2689         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2690
2691         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2692         switch (nfserr) {
2693         case nfs_ok:
2694                 break;
2695         case nfserr_resource:
2696                 nfserr = nfserr_toosmall;
2697                 goto fail;
2698         case nfserr_noent:
2699                 goto skip_entry;
2700         default:
2701                 /*
2702                  * If the client requested the RDATTR_ERROR attribute,
2703                  * we stuff the error code into this attribute
2704                  * and continue.  If this attribute was not requested,
2705                  * then in accordance with the spec, we fail the
2706                  * entire READDIR operation(!)
2707                  */
2708                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2709                         goto fail;
2710                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2711                 if (p == NULL) {
2712                         nfserr = nfserr_toosmall;
2713                         goto fail;
2714                 }
2715         }
2716         nfserr = nfserr_toosmall;
2717         entry_bytes = xdr->buf->len - start_offset;
2718         if (entry_bytes > cd->rd_maxcount)
2719                 goto fail;
2720         cd->rd_maxcount -= entry_bytes;
2721         if (!cd->rd_dircount)
2722                 goto fail;
2723         cd->rd_dircount--;
2724         cd->cookie_offset = cookie_offset;
2725 skip_entry:
2726         cd->common.err = nfs_ok;
2727         return 0;
2728 fail:
2729         xdr_truncate_encode(xdr, start_offset);
2730         cd->common.err = nfserr;
2731         return -EINVAL;
2732 }
2733
2734 static __be32
2735 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2736 {
2737         __be32 *p;
2738
2739         p = xdr_reserve_space(xdr, sizeof(stateid_t));
2740         if (!p)
2741                 return nfserr_resource;
2742         *p++ = cpu_to_be32(sid->si_generation);
2743         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
2744                                         sizeof(stateid_opaque_t));
2745         return 0;
2746 }
2747
2748 static __be32
2749 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2750 {
2751         struct xdr_stream *xdr = &resp->xdr;
2752         __be32 *p;
2753
2754         if (!nfserr) {
2755                 p = xdr_reserve_space(xdr, 8);
2756                 if (!p)
2757                         return nfserr_resource;
2758                 *p++ = cpu_to_be32(access->ac_supported);
2759                 *p++ = cpu_to_be32(access->ac_resp_access);
2760         }
2761         return nfserr;
2762 }
2763
2764 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2765 {
2766         struct xdr_stream *xdr = &resp->xdr;
2767         __be32 *p;
2768
2769         if (!nfserr) {
2770                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
2771                 if (!p)
2772                         return nfserr_resource;
2773                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
2774                                                 NFS4_MAX_SESSIONID_LEN);
2775                 *p++ = cpu_to_be32(bcts->dir);
2776                 /* Sorry, we do not yet support RDMA over 4.1: */
2777                 *p++ = cpu_to_be32(0);
2778         }
2779         return nfserr;
2780 }
2781
2782 static __be32
2783 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2784 {
2785         struct xdr_stream *xdr = &resp->xdr;
2786
2787         if (!nfserr)
2788                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2789
2790         return nfserr;
2791 }
2792
2793
2794 static __be32
2795 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2796 {
2797         struct xdr_stream *xdr = &resp->xdr;
2798         __be32 *p;
2799
2800         if (!nfserr) {
2801                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
2802                 if (!p)
2803                         return nfserr_resource;
2804                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
2805                                                 NFS4_VERIFIER_SIZE);
2806         }
2807         return nfserr;
2808 }
2809
2810 static __be32
2811 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2812 {
2813         struct xdr_stream *xdr = &resp->xdr;
2814         __be32 *p;
2815
2816         if (!nfserr) {
2817                 p = xdr_reserve_space(xdr, 32);
2818                 if (!p)
2819                         return nfserr_resource;
2820                 write_cinfo(&p, &create->cr_cinfo);
2821                 *p++ = cpu_to_be32(2);
2822                 *p++ = cpu_to_be32(create->cr_bmval[0]);
2823                 *p++ = cpu_to_be32(create->cr_bmval[1]);
2824         }
2825         return nfserr;
2826 }
2827
2828 static __be32
2829 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2830 {
2831         struct svc_fh *fhp = getattr->ga_fhp;
2832         struct xdr_stream *xdr = &resp->xdr;
2833
2834         if (nfserr)
2835                 return nfserr;
2836
2837         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
2838                                     getattr->ga_bmval,
2839                                     resp->rqstp, 0);
2840         return nfserr;
2841 }
2842
2843 static __be32
2844 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2845 {
2846         struct xdr_stream *xdr = &resp->xdr;
2847         struct svc_fh *fhp = *fhpp;
2848         unsigned int len;
2849         __be32 *p;
2850
2851         if (!nfserr) {
2852                 len = fhp->fh_handle.fh_size;
2853                 p = xdr_reserve_space(xdr, len + 4);
2854                 if (!p)
2855                         return nfserr_resource;
2856                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
2857         }
2858         return nfserr;
2859 }
2860
2861 /*
2862 * Including all fields other than the name, a LOCK4denied structure requires
2863 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2864 */
2865 static __be32
2866 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
2867 {
2868         struct xdr_netobj *conf = &ld->ld_owner;
2869         __be32 *p;
2870
2871 again:
2872         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2873         if (!p) {
2874                 /*
2875                  * Don't fail to return the result just because we can't
2876                  * return the conflicting open:
2877                  */
2878                 if (conf->len) {
2879                         conf->len = 0;
2880                         conf->data = NULL;
2881                         goto again;
2882                 }
2883                 return nfserr_resource;
2884         }
2885         p = xdr_encode_hyper(p, ld->ld_start);
2886         p = xdr_encode_hyper(p, ld->ld_length);
2887         *p++ = cpu_to_be32(ld->ld_type);
2888         if (conf->len) {
2889                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
2890                 p = xdr_encode_opaque(p, conf->data, conf->len);
2891         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2892                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
2893                 *p++ = cpu_to_be32(0); /* length of owner name */
2894         }
2895         return nfserr_denied;
2896 }
2897
2898 static __be32
2899 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2900 {
2901         struct xdr_stream *xdr = &resp->xdr;
2902
2903         if (!nfserr)
2904                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2905         else if (nfserr == nfserr_denied)
2906                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2907         kfree(lock->lk_denied.ld_owner.data);
2908         return nfserr;
2909 }
2910
2911 static __be32
2912 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2913 {
2914         struct xdr_stream *xdr = &resp->xdr;
2915
2916         if (nfserr == nfserr_denied)
2917                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2918         return nfserr;
2919 }
2920
2921 static __be32
2922 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2923 {
2924         struct xdr_stream *xdr = &resp->xdr;
2925
2926         if (!nfserr)
2927                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2928
2929         return nfserr;
2930 }
2931
2932
2933 static __be32
2934 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2935 {
2936         struct xdr_stream *xdr = &resp->xdr;
2937         __be32 *p;
2938
2939         if (!nfserr) {
2940                 p = xdr_reserve_space(xdr, 20);
2941                 if (!p)
2942                         return nfserr_resource;
2943                 write_cinfo(&p, &link->li_cinfo);
2944         }
2945         return nfserr;
2946 }
2947
2948
2949 static __be32
2950 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2951 {
2952         struct xdr_stream *xdr = &resp->xdr;
2953         __be32 *p;
2954
2955         if (nfserr)
2956                 goto out;
2957
2958         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
2959         if (nfserr)
2960                 goto out;
2961         p = xdr_reserve_space(xdr, 40);
2962         if (!p)
2963                 return nfserr_resource;
2964         write_cinfo(&p, &open->op_cinfo);
2965         *p++ = cpu_to_be32(open->op_rflags);
2966         *p++ = cpu_to_be32(2);
2967         *p++ = cpu_to_be32(open->op_bmval[0]);
2968         *p++ = cpu_to_be32(open->op_bmval[1]);
2969         *p++ = cpu_to_be32(open->op_delegate_type);
2970
2971         switch (open->op_delegate_type) {
2972         case NFS4_OPEN_DELEGATE_NONE:
2973                 break;
2974         case NFS4_OPEN_DELEGATE_READ:
2975                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
2976                 if (nfserr)
2977                         return nfserr;
2978                 p = xdr_reserve_space(xdr, 20);
2979                 if (!p)
2980                         return nfserr_resource;
2981                 *p++ = cpu_to_be32(open->op_recall);
2982
2983                 /*
2984                  * TODO: ACE's in delegations
2985                  */
2986                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2987                 *p++ = cpu_to_be32(0);
2988                 *p++ = cpu_to_be32(0);
2989                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
2990                 break;
2991         case NFS4_OPEN_DELEGATE_WRITE:
2992                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
2993                 if (nfserr)
2994                         return nfserr;
2995                 p = xdr_reserve_space(xdr, 32);
2996                 if (!p)
2997                         return nfserr_resource;
2998                 *p++ = cpu_to_be32(0);
2999
3000                 /*
3001                  * TODO: space_limit's in delegations
3002                  */
3003                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3004                 *p++ = cpu_to_be32(~(u32)0);
3005                 *p++ = cpu_to_be32(~(u32)0);
3006
3007                 /*
3008                  * TODO: ACE's in delegations
3009                  */
3010                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3011                 *p++ = cpu_to_be32(0);
3012                 *p++ = cpu_to_be32(0);
3013                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3014                 break;
3015         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3016                 switch (open->op_why_no_deleg) {
3017                 case WND4_CONTENTION:
3018                 case WND4_RESOURCE:
3019                         p = xdr_reserve_space(xdr, 8);
3020                         if (!p)
3021                                 return nfserr_resource;
3022                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3023                         /* deleg signaling not supported yet: */
3024                         *p++ = cpu_to_be32(0);
3025                         break;
3026                 default:
3027                         p = xdr_reserve_space(xdr, 4);
3028                         if (!p)
3029                                 return nfserr_resource;
3030                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3031                 }
3032                 break;
3033         default:
3034                 BUG();
3035         }
3036         /* XXX save filehandle here */
3037 out:
3038         return nfserr;
3039 }
3040
3041 static __be32
3042 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3043 {
3044         struct xdr_stream *xdr = &resp->xdr;
3045
3046         if (!nfserr)
3047                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3048
3049         return nfserr;
3050 }
3051
3052 static __be32
3053 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3054 {
3055         struct xdr_stream *xdr = &resp->xdr;
3056
3057         if (!nfserr)
3058                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3059
3060         return nfserr;
3061 }
3062
3063 static __be32 nfsd4_encode_splice_read(
3064                                 struct nfsd4_compoundres *resp,
3065                                 struct nfsd4_read *read,
3066                                 struct file *file, unsigned long maxcount)
3067 {
3068         struct xdr_stream *xdr = &resp->xdr;
3069         struct xdr_buf *buf = xdr->buf;
3070         u32 eof;
3071         int space_left;
3072         __be32 nfserr;
3073         __be32 *p = xdr->p - 2;
3074
3075         /*
3076          * Don't inline pages unless we know there's room for eof,
3077          * count, and possible padding:
3078          */
3079         if (xdr->end - xdr->p < 3)
3080                 return nfserr_resource;
3081
3082         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3083                                   read->rd_offset, &maxcount);
3084         if (nfserr) {
3085                 /*
3086                  * nfsd_splice_actor may have already messed with the
3087                  * page length; reset it so as not to confuse
3088                  * xdr_truncate_encode:
3089                  */
3090                 buf->page_len = 0;
3091                 return nfserr;
3092         }
3093
3094         eof = (read->rd_offset + maxcount >=
3095                read->rd_fhp->fh_dentry->d_inode->i_size);
3096
3097         *(p++) = htonl(eof);
3098         *(p++) = htonl(maxcount);
3099
3100         buf->page_len = maxcount;
3101         buf->len += maxcount;
3102         xdr->page_ptr += (maxcount + PAGE_SIZE - 1) / PAGE_SIZE;
3103
3104         /* Use rest of head for padding and remaining ops: */
3105         buf->tail[0].iov_base = xdr->p;
3106         buf->tail[0].iov_len = 0;
3107         xdr->iov = buf->tail;
3108         if (maxcount&3) {
3109                 int pad = 4 - (maxcount&3);
3110
3111                 *(xdr->p++) = 0;
3112
3113                 buf->tail[0].iov_base += maxcount&3;
3114                 buf->tail[0].iov_len = pad;
3115                 buf->len += pad;
3116         }
3117
3118         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3119                                 buf->buflen - buf->len);
3120         buf->buflen = buf->len + space_left;
3121         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3122
3123         return 0;
3124 }
3125
3126 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3127                                  struct nfsd4_read *read,
3128                                  struct file *file, unsigned long maxcount)
3129 {
3130         struct xdr_stream *xdr = &resp->xdr;
3131         u32 eof;
3132         int v;
3133         int starting_len = xdr->buf->len - 8;
3134         long len;
3135         int thislen;
3136         __be32 nfserr;
3137         __be32 tmp;
3138         __be32 *p;
3139         u32 zzz = 0;
3140         int pad;
3141
3142         len = maxcount;
3143         v = 0;
3144
3145         thislen = (void *)xdr->end - (void *)xdr->p;
3146         if (len < thislen)
3147                 thislen = len;
3148         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3149         WARN_ON_ONCE(!p);
3150         resp->rqstp->rq_vec[v].iov_base = p;
3151         resp->rqstp->rq_vec[v].iov_len = thislen;
3152         v++;
3153         len -= thislen;
3154
3155         while (len) {
3156                 thislen = min_t(long, len, PAGE_SIZE);
3157                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3158                 WARN_ON_ONCE(!p);
3159                 resp->rqstp->rq_vec[v].iov_base = p;
3160                 resp->rqstp->rq_vec[v].iov_len = thislen;
3161                 v++;
3162                 len -= thislen;
3163         }
3164         read->rd_vlen = v;
3165
3166         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3167                         read->rd_vlen, &maxcount);
3168         if (nfserr)
3169                 return nfserr;
3170         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3171
3172         eof = (read->rd_offset + maxcount >=
3173                read->rd_fhp->fh_dentry->d_inode->i_size);
3174
3175         tmp = htonl(eof);
3176         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3177         tmp = htonl(maxcount);
3178         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3179
3180         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3181         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3182                                                                 &zzz, pad);
3183         return 0;
3184
3185 }
3186
3187 static __be32
3188 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3189                   struct nfsd4_read *read)
3190 {
3191         unsigned long maxcount;
3192         struct xdr_stream *xdr = &resp->xdr;
3193         struct file *file = read->rd_filp;
3194         int starting_len = xdr->buf->len;
3195         struct raparms *ra;
3196         __be32 *p;
3197         __be32 err;
3198
3199         if (nfserr)
3200                 return nfserr;
3201
3202         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3203         if (!p) {
3204                 WARN_ON_ONCE(resp->rqstp->rq_splice_ok);
3205                 return nfserr_resource;
3206         }
3207         if (resp->xdr.buf->page_len && resp->rqstp->rq_splice_ok) {
3208                 WARN_ON_ONCE(1);
3209                 return nfserr_resource;
3210         }
3211         xdr_commit_encode(xdr);
3212
3213         maxcount = svc_max_payload(resp->rqstp);
3214         if (maxcount > xdr->buf->buflen - xdr->buf->len)
3215                 maxcount = xdr->buf->buflen - xdr->buf->len;
3216         if (maxcount > read->rd_length)
3217                 maxcount = read->rd_length;
3218
3219         if (!read->rd_filp) {
3220                 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
3221                                                 &file, &ra);
3222                 if (err)
3223                         goto err_truncate;
3224         }
3225
3226         if (file->f_op->splice_read && resp->rqstp->rq_splice_ok)
3227                 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
3228         else
3229                 err = nfsd4_encode_readv(resp, read, file, maxcount);
3230
3231         if (!read->rd_filp)
3232                 nfsd_put_tmp_read_open(file, ra);
3233
3234 err_truncate:
3235         if (err)
3236                 xdr_truncate_encode(xdr, starting_len);
3237         return err;
3238 }
3239
3240 static __be32
3241 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3242 {
3243         int maxcount;
3244         __be32 wire_count;
3245         int zero = 0;
3246         struct xdr_stream *xdr = &resp->xdr;
3247         int length_offset = xdr->buf->len;
3248         __be32 *p;
3249
3250         if (nfserr)
3251                 return nfserr;
3252
3253         p = xdr_reserve_space(xdr, 4);
3254         if (!p)
3255                 return nfserr_resource;
3256         maxcount = PAGE_SIZE;
3257
3258         p = xdr_reserve_space(xdr, maxcount);
3259         if (!p)
3260                 return nfserr_resource;
3261         /*
3262          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3263          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3264          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3265          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3266          */
3267         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3268                                                 (char *)p, &maxcount);
3269         if (nfserr == nfserr_isdir)
3270                 nfserr = nfserr_inval;
3271         if (nfserr) {
3272                 xdr_truncate_encode(xdr, length_offset);
3273                 return nfserr;
3274         }
3275
3276         wire_count = htonl(maxcount);
3277         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3278         xdr_truncate_encode(xdr, length_offset + 4 + maxcount);
3279         if (maxcount & 3)
3280                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3281                                                 &zero, 4 - (maxcount&3));
3282         return 0;
3283 }
3284
3285 static __be32
3286 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3287 {
3288         int maxcount;
3289         int bytes_left;
3290         loff_t offset;
3291         __be64 wire_offset;
3292         struct xdr_stream *xdr = &resp->xdr;
3293         int starting_len = xdr->buf->len;
3294         __be32 *p;
3295
3296         if (nfserr)
3297                 return nfserr;
3298
3299         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3300         if (!p)
3301                 return nfserr_resource;
3302
3303         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3304         *p++ = cpu_to_be32(0);
3305         *p++ = cpu_to_be32(0);
3306         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3307                                 - (char *)resp->xdr.buf->head[0].iov_base;
3308
3309         /*
3310          * Number of bytes left for directory entries allowing for the
3311          * final 8 bytes of the readdir and a following failed op:
3312          */
3313         bytes_left = xdr->buf->buflen - xdr->buf->len
3314                         - COMPOUND_ERR_SLACK_SPACE - 8;
3315         if (bytes_left < 0) {
3316                 nfserr = nfserr_resource;
3317                 goto err_no_verf;
3318         }
3319         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3320         /*
3321          * Note the rfc defines rd_maxcount as the size of the
3322          * READDIR4resok structure, which includes the verifier above
3323          * and the 8 bytes encoded at the end of this function:
3324          */
3325         if (maxcount < 16) {
3326                 nfserr = nfserr_toosmall;
3327                 goto err_no_verf;
3328         }
3329         maxcount = min_t(int, maxcount-16, bytes_left);
3330
3331         readdir->xdr = xdr;
3332         readdir->rd_maxcount = maxcount;
3333         readdir->common.err = 0;
3334         readdir->cookie_offset = 0;
3335
3336         offset = readdir->rd_cookie;
3337         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3338                               &offset,
3339                               &readdir->common, nfsd4_encode_dirent);
3340         if (nfserr == nfs_ok &&
3341             readdir->common.err == nfserr_toosmall &&
3342             xdr->buf->len == starting_len + 8) {
3343                 /* nothing encoded; which limit did we hit?: */
3344                 if (maxcount - 16 < bytes_left)
3345                         /* It was the fault of rd_maxcount: */
3346                         nfserr = nfserr_toosmall;
3347                 else
3348                         /* We ran out of buffer space: */
3349                         nfserr = nfserr_resource;
3350         }
3351         if (nfserr)
3352                 goto err_no_verf;
3353
3354         if (readdir->cookie_offset) {
3355                 wire_offset = cpu_to_be64(offset);
3356                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3357                                                         &wire_offset, 8);
3358         }
3359
3360         p = xdr_reserve_space(xdr, 8);
3361         if (!p) {
3362                 WARN_ON_ONCE(1);
3363                 goto err_no_verf;
3364         }
3365         *p++ = 0;       /* no more entries */
3366         *p++ = htonl(readdir->common.err == nfserr_eof);
3367
3368         return 0;
3369 err_no_verf:
3370         xdr_truncate_encode(xdr, starting_len);
3371         return nfserr;
3372 }
3373
3374 static __be32
3375 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3376 {
3377         struct xdr_stream *xdr = &resp->xdr;
3378         __be32 *p;
3379
3380         if (!nfserr) {
3381                 p = xdr_reserve_space(xdr, 20);
3382                 if (!p)
3383                         return nfserr_resource;
3384                 write_cinfo(&p, &remove->rm_cinfo);
3385         }
3386         return nfserr;
3387 }
3388
3389 static __be32
3390 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3391 {
3392         struct xdr_stream *xdr = &resp->xdr;
3393         __be32 *p;
3394
3395         if (!nfserr) {
3396                 p = xdr_reserve_space(xdr, 40);
3397                 if (!p)
3398                         return nfserr_resource;
3399                 write_cinfo(&p, &rename->rn_sinfo);
3400                 write_cinfo(&p, &rename->rn_tinfo);
3401         }
3402         return nfserr;
3403 }
3404
3405 static __be32
3406 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3407                          __be32 nfserr, struct svc_export *exp)
3408 {
3409         u32 i, nflavs, supported;
3410         struct exp_flavor_info *flavs;
3411         struct exp_flavor_info def_flavs[2];
3412         __be32 *p, *flavorsp;
3413         static bool report = true;
3414
3415         if (nfserr)
3416                 goto out;
3417         nfserr = nfserr_resource;
3418         if (exp->ex_nflavors) {
3419                 flavs = exp->ex_flavors;
3420                 nflavs = exp->ex_nflavors;
3421         } else { /* Handling of some defaults in absence of real secinfo: */
3422                 flavs = def_flavs;
3423                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3424                         nflavs = 2;
3425                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3426                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3427                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3428                         nflavs = 1;
3429                         flavs[0].pseudoflavor
3430                                         = svcauth_gss_flavor(exp->ex_client);
3431                 } else {
3432                         nflavs = 1;
3433                         flavs[0].pseudoflavor
3434                                         = exp->ex_client->flavour->flavour;
3435                 }
3436         }
3437
3438         supported = 0;
3439         p = xdr_reserve_space(xdr, 4);
3440         if (!p)
3441                 goto out;
3442         flavorsp = p++;         /* to be backfilled later */
3443
3444         for (i = 0; i < nflavs; i++) {
3445                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3446                 struct rpcsec_gss_info info;
3447
3448                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3449                         supported++;
3450                         p = xdr_reserve_space(xdr, 4 + 4 +
3451                                               XDR_LEN(info.oid.len) + 4 + 4);
3452                         if (!p)
3453                                 goto out;
3454                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3455                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3456                         *p++ = cpu_to_be32(info.qop);
3457                         *p++ = cpu_to_be32(info.service);
3458                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3459                         supported++;
3460                         p = xdr_reserve_space(xdr, 4);
3461                         if (!p)
3462                                 goto out;
3463                         *p++ = cpu_to_be32(pf);
3464                 } else {
3465                         if (report)
3466                                 pr_warn("NFS: SECINFO: security flavor %u "
3467                                         "is not supported\n", pf);
3468                 }
3469         }
3470
3471         if (nflavs != supported)
3472                 report = false;
3473         *flavorsp = htonl(supported);
3474         nfserr = 0;
3475 out:
3476         if (exp)
3477                 exp_put(exp);
3478         return nfserr;
3479 }
3480
3481 static __be32
3482 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3483                      struct nfsd4_secinfo *secinfo)
3484 {
3485         struct xdr_stream *xdr = &resp->xdr;
3486
3487         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3488 }
3489
3490 static __be32
3491 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3492                      struct nfsd4_secinfo_no_name *secinfo)
3493 {
3494         struct xdr_stream *xdr = &resp->xdr;
3495
3496         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3497 }
3498
3499 /*
3500  * The SETATTR encode routine is special -- it always encodes a bitmap,
3501  * regardless of the error status.
3502  */
3503 static __be32
3504 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3505 {
3506         struct xdr_stream *xdr = &resp->xdr;
3507         __be32 *p;
3508
3509         p = xdr_reserve_space(xdr, 16);
3510         if (!p)
3511                 return nfserr_resource;
3512         if (nfserr) {
3513                 *p++ = cpu_to_be32(3);
3514                 *p++ = cpu_to_be32(0);
3515                 *p++ = cpu_to_be32(0);
3516                 *p++ = cpu_to_be32(0);
3517         }
3518         else {
3519                 *p++ = cpu_to_be32(3);
3520                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3521                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3522                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3523         }
3524         return nfserr;
3525 }
3526
3527 static __be32
3528 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3529 {
3530         struct xdr_stream *xdr = &resp->xdr;
3531         __be32 *p;
3532
3533         if (!nfserr) {
3534                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3535                 if (!p)
3536                         return nfserr_resource;
3537                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3538                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3539                                                 NFS4_VERIFIER_SIZE);
3540         }
3541         else if (nfserr == nfserr_clid_inuse) {
3542                 p = xdr_reserve_space(xdr, 8);
3543                 if (!p)
3544                         return nfserr_resource;
3545                 *p++ = cpu_to_be32(0);
3546                 *p++ = cpu_to_be32(0);
3547         }
3548         return nfserr;
3549 }
3550
3551 static __be32
3552 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3553 {
3554         struct xdr_stream *xdr = &resp->xdr;
3555         __be32 *p;
3556
3557         if (!nfserr) {
3558                 p = xdr_reserve_space(xdr, 16);
3559                 if (!p)
3560                         return nfserr_resource;
3561                 *p++ = cpu_to_be32(write->wr_bytes_written);
3562                 *p++ = cpu_to_be32(write->wr_how_written);
3563                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3564                                                         NFS4_VERIFIER_SIZE);
3565         }
3566         return nfserr;
3567 }
3568
3569 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3570         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3571               1 << (OP_EXCHANGE_ID - 32) |
3572               1 << (OP_CREATE_SESSION - 32) |
3573               1 << (OP_DESTROY_SESSION - 32) |
3574               1 << (OP_DESTROY_CLIENTID - 32)
3575 };
3576
3577 static __be32
3578 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3579                          struct nfsd4_exchange_id *exid)
3580 {
3581         struct xdr_stream *xdr = &resp->xdr;
3582         __be32 *p;
3583         char *major_id;
3584         char *server_scope;
3585         int major_id_sz;
3586         int server_scope_sz;
3587         uint64_t minor_id = 0;
3588
3589         if (nfserr)
3590                 return nfserr;
3591
3592         major_id = utsname()->nodename;
3593         major_id_sz = strlen(major_id);
3594         server_scope = utsname()->nodename;
3595         server_scope_sz = strlen(server_scope);
3596
3597         p = xdr_reserve_space(xdr,
3598                 8 /* eir_clientid */ +
3599                 4 /* eir_sequenceid */ +
3600                 4 /* eir_flags */ +
3601                 4 /* spr_how */);
3602         if (!p)
3603                 return nfserr_resource;
3604
3605         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3606         *p++ = cpu_to_be32(exid->seqid);
3607         *p++ = cpu_to_be32(exid->flags);
3608
3609         *p++ = cpu_to_be32(exid->spa_how);
3610
3611         switch (exid->spa_how) {
3612         case SP4_NONE:
3613                 break;
3614         case SP4_MACH_CRED:
3615                 /* spo_must_enforce, spo_must_allow */
3616                 p = xdr_reserve_space(xdr, 16);
3617                 if (!p)
3618                         return nfserr_resource;
3619
3620                 /* spo_must_enforce bitmap: */
3621                 *p++ = cpu_to_be32(2);
3622                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3623                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3624                 /* empty spo_must_allow bitmap: */
3625                 *p++ = cpu_to_be32(0);
3626
3627                 break;
3628         default:
3629                 WARN_ON_ONCE(1);
3630         }
3631
3632         p = xdr_reserve_space(xdr,
3633                 8 /* so_minor_id */ +
3634                 4 /* so_major_id.len */ +
3635                 (XDR_QUADLEN(major_id_sz) * 4) +
3636                 4 /* eir_server_scope.len */ +
3637                 (XDR_QUADLEN(server_scope_sz) * 4) +
3638                 4 /* eir_server_impl_id.count (0) */);
3639         if (!p)
3640                 return nfserr_resource;
3641
3642         /* The server_owner struct */
3643         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3644         /* major id */
3645         p = xdr_encode_opaque(p, major_id, major_id_sz);
3646
3647         /* Server scope */
3648         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3649
3650         /* Implementation id */
3651         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3652         return 0;
3653 }
3654
3655 static __be32
3656 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3657                             struct nfsd4_create_session *sess)
3658 {
3659         struct xdr_stream *xdr = &resp->xdr;
3660         __be32 *p;
3661
3662         if (nfserr)
3663                 return nfserr;
3664
3665         p = xdr_reserve_space(xdr, 24);
3666         if (!p)
3667                 return nfserr_resource;
3668         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3669                                         NFS4_MAX_SESSIONID_LEN);
3670         *p++ = cpu_to_be32(sess->seqid);
3671         *p++ = cpu_to_be32(sess->flags);
3672
3673         p = xdr_reserve_space(xdr, 28);
3674         if (!p)
3675                 return nfserr_resource;
3676         *p++ = cpu_to_be32(0); /* headerpadsz */
3677         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3678         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3679         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3680         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3681         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3682         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3683
3684         if (sess->fore_channel.nr_rdma_attrs) {
3685                 p = xdr_reserve_space(xdr, 4);
3686                 if (!p)
3687                         return nfserr_resource;
3688                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3689         }
3690
3691         p = xdr_reserve_space(xdr, 28);
3692         if (!p)
3693                 return nfserr_resource;
3694         *p++ = cpu_to_be32(0); /* headerpadsz */
3695         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3696         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3697         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3698         *p++ = cpu_to_be32(sess->back_channel.maxops);
3699         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3700         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3701
3702         if (sess->back_channel.nr_rdma_attrs) {
3703                 p = xdr_reserve_space(xdr, 4);
3704                 if (!p)
3705                         return nfserr_resource;
3706                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3707         }
3708         return 0;
3709 }
3710
3711 static __be32
3712 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3713                       struct nfsd4_sequence *seq)
3714 {
3715         struct xdr_stream *xdr = &resp->xdr;
3716         __be32 *p;
3717
3718         if (nfserr)
3719                 return nfserr;
3720
3721         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3722         if (!p)
3723                 return nfserr_resource;
3724         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
3725                                         NFS4_MAX_SESSIONID_LEN);
3726         *p++ = cpu_to_be32(seq->seqid);
3727         *p++ = cpu_to_be32(seq->slotid);
3728         /* Note slotid's are numbered from zero: */
3729         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
3730         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
3731         *p++ = cpu_to_be32(seq->status_flags);
3732
3733         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3734         return 0;
3735 }
3736
3737 static __be32
3738 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3739                           struct nfsd4_test_stateid *test_stateid)
3740 {
3741         struct xdr_stream *xdr = &resp->xdr;
3742         struct nfsd4_test_stateid_id *stateid, *next;
3743         __be32 *p;
3744
3745         if (nfserr)
3746                 return nfserr;
3747
3748         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3749         if (!p)
3750                 return nfserr_resource;
3751         *p++ = htonl(test_stateid->ts_num_ids);
3752
3753         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3754                 *p++ = stateid->ts_id_status;
3755         }
3756
3757         return nfserr;
3758 }
3759
3760 static __be32
3761 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3762 {
3763         return nfserr;
3764 }
3765
3766 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3767
3768 /*
3769  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3770  * since we don't need to filter out obsolete ops as this is
3771  * done in the decoding phase.
3772  */
3773 static nfsd4_enc nfsd4_enc_ops[] = {
3774         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3775         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3776         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3777         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3778         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3779         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3780         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3781         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3782         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3783         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3784         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3785         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3786         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3787         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3788         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3789         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3790         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3791         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3792         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3793         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3794         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3795         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3796         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3797         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3798         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3799         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3800         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3801         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3802         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3803         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3804         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3805         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3806         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3807         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3808         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3809         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3810         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3811
3812         /* NFSv4.1 operations */
3813         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3814         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3815         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3816         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3817         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
3818         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3819         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3820         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3821         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3822         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3823         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3824         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3825         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3826         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3827         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3828         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3829         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3830         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3831         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3832 };
3833
3834 /*
3835  * Calculate whether we still have space to encode repsize bytes.
3836  * There are two considerations:
3837  *     - For NFS versions >=4.1, the size of the reply must stay within
3838  *       session limits
3839  *     - For all NFS versions, we must stay within limited preallocated
3840  *       buffer space.
3841  *
3842  * This is called before the operation is processed, so can only provide
3843  * an upper estimate.  For some nonidempotent operations (such as
3844  * getattr), it's not necessarily a problem if that estimate is wrong,
3845  * as we can fail it after processing without significant side effects.
3846  */
3847 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
3848 {
3849         struct xdr_buf *buf = &resp->rqstp->rq_res;
3850         struct nfsd4_slot *slot = resp->cstate.slot;
3851
3852         if (buf->len + respsize <= buf->buflen)
3853                 return nfs_ok;
3854         if (!nfsd4_has_session(&resp->cstate))
3855                 return nfserr_resource;
3856         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
3857                 WARN_ON_ONCE(1);
3858                 return nfserr_rep_too_big_to_cache;
3859         }
3860         return nfserr_rep_too_big;
3861 }
3862
3863 void
3864 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3865 {
3866         struct xdr_stream *xdr = &resp->xdr;
3867         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3868         struct svc_rqst *rqstp = resp->rqstp;
3869         int post_err_offset;
3870         nfsd4_enc encoder;
3871         __be32 *p;
3872
3873         p = xdr_reserve_space(xdr, 8);
3874         if (!p) {
3875                 WARN_ON_ONCE(1);
3876                 return;
3877         }
3878         *p++ = cpu_to_be32(op->opnum);
3879         post_err_offset = xdr->buf->len;
3880
3881         if (op->opnum == OP_ILLEGAL)
3882                 goto status;
3883         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3884                !nfsd4_enc_ops[op->opnum]);
3885         encoder = nfsd4_enc_ops[op->opnum];
3886         op->status = encoder(resp, op->status, &op->u);
3887         xdr_commit_encode(xdr);
3888
3889         /* nfsd4_check_resp_size guarantees enough room for error status */
3890         if (!op->status) {
3891                 int space_needed = 0;
3892                 if (!nfsd4_last_compound_op(rqstp))
3893                         space_needed = COMPOUND_ERR_SLACK_SPACE;
3894                 op->status = nfsd4_check_resp_size(resp, space_needed);
3895         }
3896         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
3897                 struct nfsd4_slot *slot = resp->cstate.slot;
3898
3899                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
3900                         op->status = nfserr_rep_too_big_to_cache;
3901                 else
3902                         op->status = nfserr_rep_too_big;
3903         }
3904         if (op->status == nfserr_resource ||
3905             op->status == nfserr_rep_too_big ||
3906             op->status == nfserr_rep_too_big_to_cache) {
3907                 /*
3908                  * The operation may have already been encoded or
3909                  * partially encoded.  No op returns anything additional
3910                  * in the case of one of these three errors, so we can
3911                  * just truncate back to after the status.  But it's a
3912                  * bug if we had to do this on a non-idempotent op:
3913                  */
3914                 warn_on_nonidempotent_op(op);
3915                 xdr_truncate_encode(xdr, post_err_offset);
3916         }
3917         if (so) {
3918                 int len = xdr->buf->len - post_err_offset;
3919
3920                 so->so_replay.rp_status = op->status;
3921                 so->so_replay.rp_buflen = len;
3922                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
3923                                                 so->so_replay.rp_buf, len);
3924         }
3925 status:
3926         /* Note that op->status is already in network byte order: */
3927         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
3928 }
3929
3930 /*
3931  * Encode the reply stored in the stateowner reply cache
3932  *
3933  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3934  * previously sent already encoded operation.
3935  *
3936  * called with nfs4_lock_state() held
3937  */
3938 void
3939 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
3940 {
3941         __be32 *p;
3942         struct nfs4_replay *rp = op->replay;
3943
3944         BUG_ON(!rp);
3945
3946         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
3947         if (!p) {
3948                 WARN_ON_ONCE(1);
3949                 return;
3950         }
3951         *p++ = cpu_to_be32(op->opnum);
3952         *p++ = rp->rp_status;  /* already xdr'ed */
3953
3954         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
3955 }
3956
3957 int
3958 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3959 {
3960         return xdr_ressize_check(rqstp, p);
3961 }
3962
3963 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3964 {
3965         struct svc_rqst *rqstp = rq;
3966         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3967
3968         if (args->ops != args->iops) {
3969                 kfree(args->ops);
3970                 args->ops = args->iops;
3971         }
3972         kfree(args->tmpp);
3973         args->tmpp = NULL;
3974         while (args->to_free) {
3975                 struct tmpbuf *tb = args->to_free;
3976                 args->to_free = tb->next;
3977                 tb->release(tb->buf);
3978                 kfree(tb);
3979         }
3980         return 1;
3981 }
3982
3983 int
3984 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3985 {
3986         if (rqstp->rq_arg.head[0].iov_len % 4) {
3987                 /* client is nuts */
3988                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
3989                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
3990                 return 0;
3991         }
3992         args->p = p;
3993         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3994         args->pagelist = rqstp->rq_arg.pages;
3995         args->pagelen = rqstp->rq_arg.page_len;
3996         args->tmpp = NULL;
3997         args->to_free = NULL;
3998         args->ops = args->iops;
3999         args->rqstp = rqstp;
4000
4001         return !nfsd4_decode_compound(args);
4002 }
4003
4004 int
4005 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4006 {
4007         /*
4008          * All that remains is to write the tag and operation count...
4009          */
4010         struct nfsd4_compound_state *cs = &resp->cstate;
4011         struct xdr_buf *buf = resp->xdr.buf;
4012
4013         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4014                                  buf->tail[0].iov_len);
4015
4016         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4017
4018         p = resp->tagp;
4019         *p++ = htonl(resp->taglen);
4020         memcpy(p, resp->tag, resp->taglen);
4021         p += XDR_QUADLEN(resp->taglen);
4022         *p++ = htonl(resp->opcnt);
4023
4024         if (nfsd4_has_session(cs)) {
4025                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4026                 struct nfs4_client *clp = cs->session->se_client;
4027                 if (cs->status != nfserr_replay_cache) {
4028                         nfsd4_store_cache_entry(resp);
4029                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
4030                 }
4031                 /* Renew the clientid on success and on replay */
4032                 spin_lock(&nn->client_lock);
4033                 nfsd4_put_session(cs->session);
4034                 spin_unlock(&nn->client_lock);
4035                 put_client_renew(clp);
4036         }
4037         return 1;
4038 }
4039
4040 /*
4041  * Local variables:
4042  *  c-basic-offset: 8
4043  * End:
4044  */